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.appveyor.yml+39 .github/workflows/ci.yaml+69 .gitignore+17−1 Changelog.markdown+130 README.markdown+51−5 cabal.project+10 cbits/DirectoryFsync.c+3 cbits/darwin_statfs.c+23 default.nix+1 docker.nix+18 docs/15_minute_tutorial.markdown+86−89 docs/acid_assessment.markdown+2−2 docs/atomfunctions.markdown+39−4 docs/basic_benchmarks.html+1230 docs/commits_in_constant_time.markdown+134 docs/data_independence.markdown+109 docs/database_context_functions.markdown+167 docs/dataframes.markdown+53 docs/filesystem-persistence.markdown+128 docs/import_export_csv.markdown+65 docs/index.markdown−1 docs/introduction_to_projectm36.markdown+39−13 docs/introduction_to_the_relational_algebra.markdown+44−13 docs/isomorphic_schemas.markdown+176 docs/javascript_driver.markdown+21 docs/jupyter_kernel.markdown+49 docs/merge_transactions.markdown+8−8 docs/merkle_transaction_graph.markdown+33 docs/new_datatypes.markdown+70−10 docs/on_null.markdown+5−5 docs/persistent_library_driver.markdown−18 docs/projectm36_client_library.markdown+15−1 docs/reaching_out_of_the_tarpit.markdown+8−9 docs/replication.markdown+30 docs/sample_session.asciinema.json+698 docs/server_mode.markdown+2−2 docs/simple_api.markdown+42 docs/transaction_graph_operators.markdown+47−25 docs/transgraphrelationalexpr.markdown+61 docs/tupleable.markdown+68 docs/tutd_cheatsheet.markdown+99 docs/tutd_tutorial.markdown+369−213 docs/using_notifications.markdown+29−25 docs/websocket_server.markdown+3−3 examples/CustomTupleable.hs+67 examples/DerivingCustomTupleable.hs+54 examples/DynamicAtomFunctions.hs+12 examples/DynamicDatabaseContextFunctions.hs+26 examples/Hospital.hs+5−5 examples/PersistClient.hs−54 examples/Plantfarm.hs+446 examples/SimpleClient.hs+10−10 examples/blog.hs+221 examples/hair.hs+44 examples/out_of_the_tarpit.hs+239−59 examples/out_of_the_tarpit.tutd+4−4 h2svg.sh+1 hp2svg.sh+2 install_tools.sh+3 jupyter/TutorialD Notebook Walkthrough.ipynb+794 jupyter/itutd/ITutorialDKernel.py+179 jupyter/itutd/__init__.py+1 jupyter/itutd/__main__.py+4 jupyter/kernel.json+5 jupyter/setup.py+19 nix/sources.json+50 nix/sources.nix+171 posts/2015-12-07-tu-quoque.html+44 project-m36.cabal+305−214 release.nix+36 runghcid.sh+2 scripts/DateExamples.tutd+26−5 scripts/multiline.tutd+2 shell.nix+1 src/bin/ProjectM36/Client/Json.hs+4−1 src/bin/ProjectM36/Server/RemoteCallTypes/Json.hs+84−33 src/bin/ProjectM36/Server/WebSocket.hs+112−39 src/bin/ProjectM36/Server/WebSocket/project-m36.js+105−13 src/bin/ProjectM36/Server/WebSocket/websocket-client.html+48−17 src/bin/ProjectM36/Server/WebSocket/websocket-client.js+124−19 src/bin/ProjectM36/Server/WebSocket/websocket-config.js+5 src/bin/ProjectM36/Server/WebSocket/websocket-server.hs+55−11 src/bin/TutorialD/Interpreter.hs+156−80 src/bin/TutorialD/Interpreter/Base.hs+200−102 src/bin/TutorialD/Interpreter/DataTypes/DateTime.hs−22 src/bin/TutorialD/Interpreter/DataTypes/Interval.hs−35 src/bin/TutorialD/Interpreter/DatabaseContextExpr.hs+101−67 src/bin/TutorialD/Interpreter/DatabaseContextIOOperator.hs+38−33 src/bin/TutorialD/Interpreter/Export/Base.hs+8−1 src/bin/TutorialD/Interpreter/Export/CSV.hs+3−4 src/bin/TutorialD/Interpreter/Import/Base.hs+20−5 src/bin/TutorialD/Interpreter/Import/BasicExamples.hs+8−3 src/bin/TutorialD/Interpreter/Import/CSV.hs+11−11 src/bin/TutorialD/Interpreter/Import/TutorialD.hs+74−19 src/bin/TutorialD/Interpreter/InformationOperator.hs+8−3 src/bin/TutorialD/Interpreter/RODatabaseContextOperator.hs+107−33 src/bin/TutorialD/Interpreter/RelationalExpr.hs+170−131 src/bin/TutorialD/Interpreter/SchemaOperator.hs+77 src/bin/TutorialD/Interpreter/TransGraphRelationalOperator.hs+46 src/bin/TutorialD/Interpreter/TransactionGraphOperator.hs+50−33 src/bin/TutorialD/Interpreter/Types.hs+38−26 src/bin/TutorialD/Printer.hs+165 src/bin/TutorialD/tutd.hs+72−61 src/bin/benchmark/Basic.hs+106 src/bin/benchmark/Handles.hs+97 src/bin/benchmark/Relation.hs+1−1 src/bin/benchmark/bigrel.hs+57−32 src/lib/ProjectM36/Arbitrary.hs+127 src/lib/ProjectM36/Atom.hs+26−16 src/lib/ProjectM36/AtomFunction.hs+72−5 src/lib/ProjectM36/AtomFunctionBody.hs+1−134 src/lib/ProjectM36/AtomFunctionError.hs+17 src/lib/ProjectM36/AtomFunctionUtils.hs+4 src/lib/ProjectM36/AtomFunctions/Basic.hs+15−1 src/lib/ProjectM36/AtomFunctions/Primitive.hs+58−47 src/lib/ProjectM36/AtomType.hs+290−100 src/lib/ProjectM36/Atomable.hs+286 src/lib/ProjectM36/Attribute.hs+188−33 src/lib/ProjectM36/AttributeExpr.hs+7 src/lib/ProjectM36/AttributeNames.hs+5−24 src/lib/ProjectM36/Base.hs+362−184 src/lib/ProjectM36/Client.hs+847−330 src/lib/ProjectM36/Client/Simple.hs+129 src/lib/ProjectM36/ConcreteTypeRep.hs−34 src/lib/ProjectM36/DataConstructorDef.hs+4−4 src/lib/ProjectM36/DataFrame.hs+183 src/lib/ProjectM36/DataTypes/Basic.hs+10−5 src/lib/ProjectM36/DataTypes/ByteString.hs+18 src/lib/ProjectM36/DataTypes/DateTime.hs+14 src/lib/ProjectM36/DataTypes/Day.hs+3−6 src/lib/ProjectM36/DataTypes/Either.hs+1−1 src/lib/ProjectM36/DataTypes/Interval.hs+140−31 src/lib/ProjectM36/DataTypes/List.hs+53 src/lib/ProjectM36/DataTypes/Maybe.hs+19−3 src/lib/ProjectM36/DataTypes/NonEmptyList.hs+53 src/lib/ProjectM36/DataTypes/Primitive.hs+22−2 src/lib/ProjectM36/DataTypes/Sorting.hs+31 src/lib/ProjectM36/DatabaseContext.hs+27−5 src/lib/ProjectM36/DatabaseContextFunction.hs+91 src/lib/ProjectM36/DatabaseContextFunctionError.hs+8 src/lib/ProjectM36/DatabaseContextFunctionUtils.hs+22 src/lib/ProjectM36/DateExamples.hs+38−35 src/lib/ProjectM36/DisconnectedTransaction.hs+17 src/lib/ProjectM36/Error.hs+66−19 src/lib/ProjectM36/FSType.hs+102 src/lib/ProjectM36/FileLock.hs+96 src/lib/ProjectM36/FunctionalDependency.hs+20 src/lib/ProjectM36/GraphRefRelationalExpr.hs+45 src/lib/ProjectM36/InclusionDependency.hs+19 src/lib/ProjectM36/IsomorphicSchema.hs+333 src/lib/ProjectM36/Key.hs+40−3 src/lib/ProjectM36/MerkleHash.hs+9 src/lib/ProjectM36/MiscUtils.hs+10−3 src/lib/ProjectM36/NormalizeExpr.hs+132 src/lib/ProjectM36/Notifications.hs+12−7 src/lib/ProjectM36/Persist.hs+71−13 src/lib/ProjectM36/Relation.hs+82−79 src/lib/ProjectM36/Relation/Parse/CSV.hs+142−30 src/lib/ProjectM36/Relation/Show/CSV.hs+15−14 src/lib/ProjectM36/Relation/Show/Gnuplot.hs+10−10 src/lib/ProjectM36/Relation/Show/HTML.hs+36−10 src/lib/ProjectM36/Relation/Show/Term.hs+39−35 src/lib/ProjectM36/RelationalExpression.hs+1272−475 src/lib/ProjectM36/ScriptBase.hs−4 src/lib/ProjectM36/ScriptSession.hs+275 src/lib/ProjectM36/Serialise/AtomFunctionError.hs+7 src/lib/ProjectM36/Serialise/Base.hs+85 src/lib/ProjectM36/Serialise/DataFrame.hs+13 src/lib/ProjectM36/Serialise/DatabaseContextFunctionError.hs+7 src/lib/ProjectM36/Serialise/Error.hs+15 src/lib/ProjectM36/Serialise/IsomorphicSchema.hs+7 src/lib/ProjectM36/Serialise/MergeError.hs+1 src/lib/ProjectM36/Server.hs+200−68 src/lib/ProjectM36/Server/#WebSocket.hs#−89 src/lib/ProjectM36/Server/Config.hs+16−3 src/lib/ProjectM36/Server/EntryPoints.hs+140−84 src/lib/ProjectM36/Server/ParseArgs.hs+75−21 src/lib/ProjectM36/Server/RemoteCallTypes.hs+80−22 src/lib/ProjectM36/Session.hs+33−5 src/lib/ProjectM36/Sessions.hs+30−8 src/lib/ProjectM36/Shortcuts.hs+247 src/lib/ProjectM36/StaticOptimizer.hs+534−135 src/lib/ProjectM36/TransGraphRelationalExpression.hs+180 src/lib/ProjectM36/Transaction.hs+36−16 src/lib/ProjectM36/Transaction/Persist.hs+186−69 src/lib/ProjectM36/Transaction/Type.hs+8 src/lib/ProjectM36/TransactionDiffs.hs+12 src/lib/ProjectM36/TransactionGraph.hs+374−151 src/lib/ProjectM36/TransactionGraph/Merge.hs+25−16 src/lib/ProjectM36/TransactionGraph/Persist.hs+128−50 src/lib/ProjectM36/TransactionGraph/Show.hs+3−4 src/lib/ProjectM36/TransactionGraph/Show/Dot.hs+1−1 src/lib/ProjectM36/TransactionGraph/Types.hs+12 src/lib/ProjectM36/TransactionInfo.hs+12 src/lib/ProjectM36/Tuple.hs+81−62 src/lib/ProjectM36/TupleSet.hs+11−4 src/lib/ProjectM36/Tupleable.hs+287 src/lib/ProjectM36/Tupleable/Deriving.hs+229 src/lib/ProjectM36/TypeConstructor.hs+6−8 src/lib/ProjectM36/WCWidth.hs+425 src/lib/ProjectM36/WebSocketServer.hs−14 src/lib/ProjectM36/Win32Handle.hs+5−2 src/lib/ProjectM36/WithNameExpr.hs+86 src/persistent/Database/Persist/ProjectM36.hs−572 stack.ghc8.10.yaml+19 stack.ghc8.6.yaml+62 stack.yaml → stack.ghc8.8.yaml+30−9 test/Client/Simple.hs+72 test/DataFrame.hs+61 test/IsomorphicSchema.hs+138 test/MultiProcessDatabaseAccess.hs+45 test/Relation/Atomable.hs+209 test/Relation/Basic.hs+33−8 test/Relation/Export/CSV.hs+87−20 test/Relation/Import/CSV.hs+3−1 test/Relation/StaticOptimizer.hs+157−20 test/Relation/Tupleable.hs+380 test/Server/Main.hs+148−64 test/Server/WebSocket.hs+42−22 test/TransactionGraph/Automerge.hs+94 test/TransactionGraph/Merge.hs+133−53 test/TransactionGraph/Persist.hs+123−16 test/TutorialD/Interpreter.hs−291 test/TutorialD/Interpreter/AtomFunctionScript.hs+93−26 test/TutorialD/Interpreter/DatabaseContextFunctionScript.hs+65 test/TutorialD/Interpreter/Import/ImportTest.hs+47 test/TutorialD/Interpreter/Import/TutorialD.hs−21 test/TutorialD/Interpreter/Import/httpimporttest.tutd+2 test/TutorialD/Interpreter/TestBase.hs+28−13 test/TutorialD/InterpreterTest.hs+732 test/TutorialD/PrinterTest.hs+47 test/persistent-driver/test.hs−174 test/scripts.hs+5−2
.appveyor.ymlnew file+39
@@ -0,0 +1,39 @@
1+build: off
2+
3+version: 1.0.{build}-{branch}
4+
5+image: Visual Studio 2017
6+
7+before_test:
8+# http://help.appveyor.com/discussions/problems/6312-curl-command-not-found
9+- set PATH=C:\Program Files\Git\mingw64\bin;%PATH%
10+
11+- curl -sS -ostack.zip -L --insecure http://www.stackage.org/stack/windows-x86_64
12+- 7z x stack.zip stack.exe
13+
14+clone_folder: "c:\\project-m36"
15+clone_depth: 2
16+environment:
17+ global:
18+ STACK_ROOT: "c:\\sr"
19+ matrix:
20+ - YAML: "stack.ghc8.6.yaml"
21+
22+platform:
23+ - x64
24+
25+cache:
26+ - "c:\\sr"
27+ - "%LocalAppData%\\Programs\\stack"
28+# - ".stack-work" # send us over the 1 GB limit
29+
30+test_script:
31+ - stack setup > nul
32+# The ugly echo "" hack is to avoid complaints about 0 being an invalid file
33+# descriptor
34+ - echo "" | stack --stack-yaml %YAML% --no-terminal test
35+# - 7z.exe a -t7z -m0=lzma -mx=9 -mfb=64 -md=32m -ms=on project-m36.7z .stack-work\install\*\bin\project-m36-server.exe .stack-work\install\*\bin\project-m36-websocket-server.exe .stack-work\install\*\bin\tutd.exe .stack-work\install\*\bin\project-m36-server.exe
36+
37+#artifacts:
38+# - path: project-m36.7z
39+# name: project-m36.7z
.github/workflows/ci.yamlnew file+69
@@ -0,0 +1,69 @@
1+name: "CI"
2+on:
3+ pull_request:
4+ push:
5+jobs:
6+ dockerimage:
7+ runs-on: ubuntu-latest
8+ steps:
9+ - uses: actions/checkout@v2.3.1
10+ - uses: cachix/install-nix-action@v12
11+ with:
12+ nix_path: nixpkgs=channel:nixos-unstable
13+ - uses: cachix/cachix-action@v8
14+ with:
15+ name: project-m36
16+ signingKey: "${{ secrets.CACHIX_SIGNING_KEY }}"
17+ - run: cachix use iohk
18+ - name: docker load
19+ run: docker load < $(nix-build docker.nix)
20+ - name: docker login
21+ if: ${{ github.ref == 'refs/heads/master' }}
22+ run: echo ${{secrets.DOCKERHUB_PASSWORD}} | docker login --username ${{secrets.DOCKERHUB_USER}} --password-stdin
23+ - name: docker tag with version
24+ run: docker tag project-m36:latest projectm36/project-m36:$(awk '/^Version:/ {print $2}' project-m36.cabal)
25+ if: ${{ github.ref == 'refs/heads/master' }}
26+ - name: docker tag latest
27+ run: docker tag project-m36:latest projectm36/project-m36:latest
28+ if: ${{ github.ref == 'refs/heads/master' }}
29+ - run: docker push projectm36/project-m36
30+ if: ${{ github.ref == 'refs/heads/master' }}
31+
32+ stack-build:
33+ runs-on: ${{ matrix.os }}
34+ strategy:
35+ matrix:
36+ os: [ubuntu-latest]
37+ ghc:
38+ - ghc8.10
39+ - ghc8.8
40+ - ghc8.6
41+ include:
42+ - os: macos-latest
43+ ghc: ghc8.10
44+ env:
45+ STACK_YAML: stack.${{ matrix.ghc }}.yaml
46+ steps:
47+ - uses: actions/checkout@v2
48+ - name: Cache
49+ uses: actions/cache@v1
50+ with:
51+ path: ~/.stack
52+ key: ${{ runner.os }}-build-stack-${{ matrix.ghc }}-${{ hashFiles(env.STACK_YAML) }}-${{ hashFiles('**/*.cabal') }}
53+ restore-keys: |
54+ ${{ runner.os }}-build-stack-${{ matrix.ghc }}-${{ hashFiles(env.STACK_YAML) }}
55+ ${{ runner.os }}-build-stack-${{ matrix.ghc }}
56+ - name: Fix macOS cache bug
57+ run: rm -rf ~/.stack/setup-exe-cache
58+ - name: Build
59+ run: stack build --ghc-options -O2 --local-bin-path out --copy-bins
60+ - name: Test
61+ run: stack test --stack-yaml=${{ env.STACK_YAML }}
62+ - name: HLint
63+ run: curl -sSL https://raw.github.com/ndmitchell/hlint/master/misc/run.sh | sh -s .
64+ - name: Haddock
65+ run: stack --no-install-ghc --system-ghc --no-haddock-deps haddock
66+ - uses: actions/upload-artifact@v2
67+ with:
68+ name: project-m36-${{ matrix.os }}-${{ matrix.ghc }}
69+ path: out/
.gitignore+17−1
@@ -4,4 +4,20 @@
44dist/
55.cabal-sandbox/
66cabal.sandbox.config
7−.stack-work
7+.stack-work
8+dist-newstyle/
9+dist_build/
10+NOTES
11+RelatedPapers/
12+_shake
13+nextsteps
14+\#*\#
15+view-system-notes
16+persistence-notes
17+*.pyc
18+jupyter/itutd.egg-info
19+jupyter/build
20+juyter/dist
21+.ipynb_checkpoints
22+project-m36.nix
23+stack.yaml
Changelog.markdownnew file+130
@@ -0,0 +1,130 @@
1+# 2021-04-01 (v0.9.3)
2+
3+* add new ":importtutd <URI> <SHA256 hash>" feature to import TutorialD from a local file or a HTTP/HTTPS URI
4+
5+# 2020-12-27 (v0.9.0)
6+
7+* replace unmaintained distributed-process-client-server RPC package with new curryer RPC package
8+* drop support for GHC 8.2 and GHC 8.4 due to dependency on DerivingVia extension
9+
10+# 2020-11-21 (v0.8.2)
11+
12+* support multiple extend expressions in TutorialD
13+* fix parsing of Bool atoms in TutorialD
14+* fix database context expressions which include self-references such as `s:=s union s`
15+* show constraints as TutorialD when using tutd console
16+* add `RelationalExprAtom` data type useful for storing `RelationalExpr` within the database
17+
18+# 2020-10-05 (v0.8.1)
19+
20+* support GHC 8.10
21+
22+# 2020-05-25 (v0.8)
23+
24+* refactor backend to maximize laziness: [An Architecture for Data Independence](docs/data_independence.markdown)
25+
26+# 2019-09-07 (v0.7)
27+
28+* fix case sensitivity issue with relation variables in tutd
29+* fix multibyte escaping in data frames
30+* fix broken instances of `Atomable [a]`
31+* fix `TypeConstructor` validation of argument count
32+* add help option to executables
33+
34+# 2019-01-08 (v0.6)
35+
36+* fix atom type parsing to support more complex data types
37+* add [data frames](docs/dataframes.markdown) to support server-side sort ordering, limits, and offsets
38+
39+# 2018-10-03 (v0.5.1)
40+
41+* fix atom function type validation
42+* add support for GHC 8.4 (now we support GHC 8.0, 8.2, and 8.4)
43+
44+# 2018-08-10 (v0.5)
45+
46+* fix critical type bug which allowed unresolved types to be used
47+* add full support for GHC 8.2 with stack or cabal (delayed for a long time by dependency version boundaries)
48+* drop support for GHC 7.10
49+* add support for `with (relexpr as name,...)` syntax for use as tutd macros
50+* add `NonEmptyList` list data type
51+
52+# 2018-06-04 (v0.4)
53+
54+* add contributed feature to allow users to [create arbitrary relations](https://github.com/agentm/project-m36/blob/master/docs/tutd_tutorial.markdown#arbitrary-relation-variables)
55+* fix type validation bug allowing concrete type with type variables in relations
56+* improve usability of `Interval a` data type
57+* allow `Integer` to be parsed as negative in `tutd` console
58+* support precompiled (Haskell) [`AtomFunction`s](https://github.com/agentm/project-m36/blob/master/docs/atomfunctions.markdown#pre-compiled-atom-functions) and [`DatabaseContextFunction`s](https://github.com/agentm/project-m36/blob/master/docs/database_context_functions.markdown#loading-precompiled-modules)
59+* make TutorialD scripts read from the filesystem unconditionally read as UTF-8
60+* improve support for display of multibyte characters in `tutd` console, especially Chinese
61+* fix file descriptor leak in file sychronization
62+* improve reliability by allowing fast-forward commits when using `autoMergeToHead`
63+* add [`semijoin` and `anitjoin`](https://github.com/agentm/project-m36/blob/master/docs/tutd_tutorial.markdown#join) support to `tutd`
64+* added various new static optimizations
65+
66+# 2017-11-14
67+
68+* alter websocket server API to allow for multiple representations (JSON, text, or HTML) to be selected and returned simultaneously
69+* add jupyter kernel for TutorialD interpreter
70+* fix warnings suggested by new hlint 2.0.10
71+
72+# 2017-10-08 (v0.3)
73+
74+* replaced overuse of `undefined` with `Proxy` in `Tupleable` and `Atomable` typeclasses
75+* allow notifications to return query results from before *and* after the commit which triggered the notification
76+* alert users in `tutd` console before a transaction graph expression is evaluated which would throw out their changes
77+* drastically-improved CSV import/export now supports all possible types except `RelationAtom`
78+* fix serious file handle leaks when using on-disk persistence
79+* fix case where invalid number of arguments to `ConstructedAtom` did not result in an error
80+* add support for `IntegerAtom` (previously, only `IntAtom` was supported)
81+
82+# 2017-09-16 (v0.2)
83+
84+* a new [simple client API](https://github.com/agentm/project-m36/blob/master/docs/simple_api.markdown) with a monadic transaction manager
85+* complete hlint compliance
86+* the generics-based [Tupleable typeclass]( https://github.com/agentm/project-m36/blob/master/docs/tupleable.markdown
87+) which makes it easy to marshal Haskell data types to-and-from the database
88+* timestamps attached to transactions to allow specific point-in-time travel
89+* autoMergeToHead, a variant of commit which attempts to merge and commit to the latest head transaction to reduce incidents of TransactionNotAHeadErrors
90+* interval data types
91+* transaction dirtiness detection which allows the client to determine if an update expression actually changed the database state
92+
93+# 2017-08-01
94+
95+## autoMergeToHead
96+
97+In preparation for the simpler monad client API, ProjectM36.Client now includes a server-side merge for new transactions called "[automerge](https://github.com/agentm/project-m36/issues/33)". This feature should reduce head contention in cases where new transactions can be simply merged to the head without additional processing. The trade-off is reduced ```TransactionIsNotAHeadError```s but an increased chance of merge errors. The feature operates similarly to a server-side git rebase.
98+
99+## critical bug in merging
100+
101+Successfully merged transactions did not have their constraints validated. Fixed.
102+
103+# 2017-06-12
104+
105+## add file locking
106+
107+This [feature](#102) allows Project:M36 database directories to be shared amongst multiple Project:M36 processes. This is similar to how SQLite operates except that the remote server mode supports the feature as well. This could allow, for example, multi-master, file-based replication across Windows shares or NFS.
108+
109+[Documentation](/docs/replication.markdown)
110+
111+# 2016-11-30
112+
113+## add functional dependency macro
114+
115+Date demonstrates two ways to implement functional dependencies as constraints on page 21 in "Database Design and Relational Theory". A similar macros is now implemented in the tutd interpreter.
116+
117+```funcdep sname_status (sname) -> (status) s```
118+
119+[Documentation](/docs/tutd_tutorial.markdown#functional-dependencies)
120+
121+# 2016-09-07
122+
123+## add TransGraphRelationalExpr
124+
125+The TransGraphRelationalExpr allows queries against all past states of the database.
126+
127+The following example executes a query against two different committed transactions using syntax similar to that of git for graph traversal:
128+```:showtransgraphexpr s@master~ join sp@master```
129+
130+[Documentation](/docs/transgraphrelationalexpr.markdown)
README.markdown+51−5
@@ -1,9 +1,25 @@
1−# Project:M36 Relational Algebra Engine
1+# Ξ Project:M36 Relational Algebra Engine
2+
3+[![Haskell Programming Language](https://img.shields.io/badge/language-Haskell-blue.svg)](https://www.haskell.org)
4+[![Public Domain](https://img.shields.io/badge/license-Public%20Domain-brightgreen.svg)](http://unlicense.org)
5+[![Hackage](https://img.shields.io/hackage/v/project-m36.svg)](http://hackage.haskell.org/package/project-m36)
6+[![Hackage dependency status](https://img.shields.io/hackage-deps/v/project-m36.svg)](http://packdeps.haskellers.com/feed?needle=project-m36)
7+[![Windows Build status](https://ci.appveyor.com/api/projects/status/q7jyddd6dy1ibqdo/branch/master?svg=true)](https://ci.appveyor.com/project/agentm/project-m36)
8+[![Github Workflow status](https://github.com/agentm/project-m36/workflows/CI/badge.svg)](https://github.com/agentm/project-m36/actions?query=workflow%3ACI)
9+
10+
11+*Software can always be made faster, but rarely can it be made more correct.*
212
313## Introduction
414
515Project:M36 implements a relational algebra engine as inspired by the writings of Chris Date.
616
17+## Quick Install
18+
19+Project:M36 can be downloaded and run via docker, which supports Windows 10, macOS, and Linux.
20+
21+Run `docker run -it projectm36/project-m36 tutd` to start the TutorialD command line interface.
22+
723## Description
824
925Unlike most database management systems (DBMS), Project:M36 is opinionated software which adheres strictly to the mathematics of the relational algebra. The purpose of this adherence is to prove that software which implements mathematically-sound design principles reaps benefits in the form of code clarity, consistency, performance, and future-proofing.
@@ -12,6 +28,10 @@ Project:M36 can be used as an in-process or remote DBMS.
1228
1329Project:M36 is written entirely in the [Haskell programming language](https://www.haskell.org/).
1430
31+## Sample Session
32+
33+[![asciicast](https://asciinema.org/a/3syu35c8cydm403292a74l1n5.png)](https://asciinema.org/a/3syu35c8cydm403292a74l1n5)
34+
1535## Use-Cases
1636
1737Project:M36 supports multiple frontends which target different audiences.
@@ -20,45 +40,71 @@ Project:M36 supports multiple frontends which target different audiences.
2040* store and manipulate databases
2141* use Project:M36 as a native Haskell database backend
2242
43+## Community
44+
45+* [Developer's Blog](https://agentm.github.io/project-m36/)
46+* [Mailing List/Discussion Group](https://groups.google.com/d/forum/project-m36)
47+* IRC Channel: irc.libera.chat #project-m36 -- [Chat via Web Client](http://kiwiirc.com/nextclient/irc.libera.chat:+6697/#project-m36)
48+* [Hackage](https://hackage.haskell.org/package/project-m36)
49+* [Diogo Biazus' Project:M36 Video Tutorial](https://www.youtube.com/watch?v=_GC_lxlVEnE)
50+
2351## Documentation
2452
2553### Introductory Materials
2654
27551. [Installation and Introduction to Project:M36](docs/introduction_to_projectm36.markdown)
28561. [Introduction to the Relational Algebra](docs/introduction_to_the_relational_algebra.markdown)
57+1. [TutorialD Cheatsheet](docs/tutd_cheatsheet.markdown)
58+1. [TutorialD via Jupyter Notebook Walkthrough](jupyter/TutorialD%20Notebook%20Walkthrough.ipynb)
29591. [TutorialD Tutorial](docs/tutd_tutorial.markdown)
30601. [15 Minute Tutorial](docs/15_minute_tutorial.markdown)
61+1. [Developer's Change Log](Changelog.markdown)
62+1. [Simple Client API](docs/simple_api.markdown)
63+1. [CSV Import/Export](docs/import_export_csv.markdown)
3164
3265### Database Comparisons
3366
34671. [ACID Database Properties](docs/acid_assessment.markdown)
35681. [On NULL (in SQL)](docs/on_null.markdown)
36691. [Reaching "Out of the Tarpit" with Project:M36](docs/reaching_out_of_the_tarpit.markdown)
70+1. [An Architecture for Data Independence](docs/data_independence.markdown)
3771
3872### Advanced Features
3973
40741. [Transaction Graph Operators](docs/transaction_graph_operators.markdown)
41−1. [Persistent Library Driver](docs/persistent_library_driver.markdown)
42751. [ProjectM36.Client Library](docs/projectm36_client_library.markdown)
76+1. [Data Frames for Sorting](docs/dataframes.markdown)
43771. [Adding New Data Types](docs/new_datatypes.markdown)
78+1. [Database-Manipulating Functions](docs/database_context_functions.markdown)
44791. [Serving Remote ProjectM36 Databases](docs/server_mode.markdown)
45801. [Using Notifications](docs/using_notifications.markdown)
46811. [Merge Transactions](docs/merge_transactions.markdown)
47−1. [WebSocket Server](docs/websocket_server.markdown)
48821. [Atom (Value) Functions](docs/atomfunctions.markdown)
83+1. [Trans-Graph Relational Expressions](docs/transgraphrelationalexpr.markdown)
84+1. [Isomorphic Schemas](docs/isomorphic_schemas.markdown)
85+1. [Replication](docs/replication.markdown)
86+1. [Basic Operator Benchmarks](https://rawgit.com/agentm/project-m36/master/docs/basic_benchmarks.html)
87+1. [Merkle Transaction Hashes](docs/merkle_transaction_graph.markdown)
88+
89+### Integrations
90+
91+1. [WebSocket Server](docs/websocket_server.markdown)
92+1. [Jupyter Notebook Kernel](docs/jupyter_kernel.markdown)
93+1. [Persistent Driver](https://github.com/YuMingLiao/persistent-project-m36)
4994
5095## Development
5196
52−Project:M36 is developed in Haskell and compiled with GHC 7.8 or later.
97+Project:M36 is developed in Haskell and compiled with GHC 8.6 or later.
5398
5499## Related Projects
55100
56101* [The Third Manifesto](http://thethirdmanifesto.com/): the philosophical basis for relational algebra engines
57102* [Rel](http://reldb.org/): a TutorialD implementation against a BerkeleyDB backend
58103* [Andl](http://andl.org/): a new database language with SQLite and PostgreSQL backends
104+* [Coddie](https://github.com/scvalencia/Coddie): a python-based relational algebra interpreter
59105
60106## Suggested Reading
61107
62−* [Out of the Tarpit](http://shaffner.us/cs/papers/tarpit.pdf): a proposed software architecture which minimizes state and complexity. Project:M36 implements the requirements of this paper.
108+* [Out of the Tarpit](https://github.com/papers-we-love/papers-we-love/blob/2eb8d21/design/out-of-the-tar-pit.pdf): a proposed software architecture which minimizes state and complexity. Project:M36 implements the requirements of this paper.
63109* [Database Design & Relational Theory: Normal Forms and All That Jazz](http://shop.oreilly.com/product/0636920025276.do): mathematical foundations for the principles of the relational algebra
64110* [Database Explorations: Essays on the Third Manifesto and Related Topics](http://bookstore.trafford.com/Products/SKU-000177853/Database-Explorations.aspx): additional essays and debates on practical approaches to relational algebra engine design
cabal.projectnew file+10
@@ -0,0 +1,10 @@
1+packages: project-m36.cabal
2+
3+package *
4+ split-sections: True
5+
6+--high-performance streaming library
7+source-repository-package
8+ type: git
9+ location: https://github.com/composewell/streamly.git
10+ tag: ac3af8749194f1788704dda8667d0b3807075cc2
cbits/DirectoryFsync.c+3
@@ -24,11 +24,13 @@ int cDirectoryFsync(char *path)
2424 ret = fstat(fd,&fdstat);
2525 if(ret < 0)
2626 {
27+ close(fd);
2728 return errno;
2829 }
2930
3031 if(!S_ISDIR(fdstat.st_mode))
3132 {
33+ close(fd);
3234 return ENOTDIR;
3335 }
3436
@@ -39,6 +41,7 @@ int cDirectoryFsync(char *path)
3941#else
4042 ret = fsync(fd);
4143#endif
44+ close(fd);
4245 if(ret < 0)
4346 {
4447 return errno;
cbits/darwin_statfs.cnew file+23
@@ -0,0 +1,23 @@
1+#include <sys/param.h>
2+#include <sys/mount.h>
3+#include <stdio.h>
4+
5+#ifndef _PROJECT_M36_STATFS_
6+#define _PROJECT_M36_STATFS_
7+#ifdef __APPLE__
8+int cDarwinFSJournaled(const char* path)
9+{
10+ struct statfs s = {0};
11+ int ret = statfs(path, &s);
12+ if(ret < 0)
13+ {
14+ /* error */
15+ return ret;
16+ }
17+ else
18+ {
19+ return s.f_flags & MNT_JOURNALED;
20+ }
21+}
22+#endif
23+#endif
default.nixnew file+1
@@ -0,0 +1 @@
1+(import ./release.nix { }).project
docker.nixnew file+18
@@ -0,0 +1,18 @@
1+{ compiler ? "ghc8104"
2+, sources ? import ./nix/sources.nix
3+, pkgs ? import sources.nixpkgs { }
4+}:
5+let
6+ release = import ./release.nix { inherit pkgs compiler sources; };
7+ static-project-m36 = pkgs.haskell.lib.dontCheck (pkgs.haskell.lib.justStaticExecutables release.project);
8+in
9+pkgs.dockerTools.buildImage {
10+ name = "project-m36";
11+ tag = "latest";
12+ contents = [ static-project-m36 ];
13+ # expose default project-m36 and websocket server ports
14+ config = {
15+ Env = [ "LC_ALL=en_US.UTF-8" ];
16+ ExposedPorts = { "6543/tcp" = { }; "8000/tcp" = { }; };
17+ };
18+}
docs/15_minute_tutorial.markdown+86−89
@@ -4,45 +4,39 @@ Thank you for evaluating Project:M36, a new relational algebra engine written in
44
55## Prerequisites
66
7−* any Linux
8−* GHC 7.10 or later version (Haskell compiler)
9−* cabal (package downloader) installed
7+* any Linux, MacOS, or Windows computer with Docker installed
108
119## Download and Install
1210
11+Run a pre-built docker image:
12+
13+```docker run -it projectm36/project-m36 tutd```
14+
15+or build it yourself with GHC >= 8.6:
16+
1317```bash
1418git clone https://github.com/agentm/project-m36.git
15−cabal sandbox init
16−cabal install --dependencies-only
17−cabal run tutd
19+cabal new-run tutd
1820```
1921
2022## Some Basic TutorialD
2123
22−When you run the ```tutd``` interpreter, you are interacting with an in-memory database using a dialect of the TutorialD language which is described in numerous book by Chris J. Date. It is a language specifically designed for human interaction with the relational algebra.
24+When you run the ```tutd``` interpreter, you are interacting with an in-memory database using a dialect of the TutorialD language which is described in numerous books by Chris J. Date. It is a language specifically designed for human interaction with the relational algebra.
2325
2426Note that TutorialD is strongly-typed- no type coercions take place automatically. For example, an integer will never be interpreted as a string or vice versa.
2527
2628### Load the Canonical Chris Date Example
2729
2830```
29−TutorialD (master): :importexample date
30−```
31−
32−or
33−
34−```
35−TutorialD (master): :importtud "scripts/DateExamples.tutd"
31+TutorialD (master/main): :importexample cjdate
3632```
3733
38−```:importtutd``` (do not skip typing the preceding colon), loads a file which contains a script written in the TutorialD dialect used by Project:M36 and executes it to change the state of the database. In this case, the relations "s" (supplier), "p" (product), and "sp" (suppliers-products) are now loaded.
39−
40−```:importexample date``` loads the date example directly without any file I/O, so it is safe to use with the websocket server.
34+```:importexample``` (do not skip typing the preceding colon), loads a built-in example schema and executes it to change the state of the database. In this case, the relations "s" (supplier), "p" (product), and "sp" (suppliers-products) are now loaded.
4135
4236### Execute Relational Expressions
4337
4438```
45−TutorialD (master): :showexpr s
39+TutorialD (master/main): :showexpr s
4640┌──────────┬────────┬───────────┬───────────┐
4741│city::Text│s#::Text│sname::Text│status::Int│
4842├──────────┼────────┼───────────┼───────────┤
@@ -63,7 +57,7 @@ You will need to [learn TutorialD](/docs/tutd_tutorial.markdown) to create relat
6357#### Joins
6458
6559```
66−TutorialD (master): :showexpr s join sp
60+TutorialD (master/main): :showexpr s join sp
6761┌──────────┬────────┬────────┬────────┬───────────┬───────────┐
6862│city::Text│p#::Text│qty::Int│s#::Text│sname::Text│status::Int│
6963├──────────┼────────┼────────┼────────┼───────────┼───────────┤
@@ -86,7 +80,7 @@ All joins in TutorialD are similar to "NATURAL JOIN" in SQL.
8680#### Restriction
8781
8882```
89−TutorialD (master): :showexpr s where status=20
83+TutorialD (master/main): :showexpr s where status=20
9084┌──────────┬────────┬───────────┬───────────┐
9185│city::Text│s#::Text│sname::Text│status::Int│
9286├──────────┼────────┼───────────┼───────────┤
@@ -100,7 +94,7 @@ Restrictions are similar to the "WHERE" clause in SQL.
10094#### Projection
10195
10296```
103−TutorialD (master): :showexpr p{color,p#,weight}
97+TutorialD (master/main): :showexpr p{color,p#,weight}
10498┌───────────┬────────┬───────────┐
10599│color::Text│p#::Text│weight::Int│
106100├───────────┼────────┼───────────┤
@@ -118,7 +112,7 @@ Projection is equivalent to "SELECT <columns>" in SQL.
118112#### Attribute Rename
119113
120114```
121−TutorialD (master): :showexpr s rename {city as town}
115+TutorialD (master/main): :showexpr s rename {city as town}
122116┌────────┬───────────┬───────────┬──────────┐
123117│s#::Text│sname::Text│status::Int│town::Text│
124118├────────┼───────────┼───────────┼──────────┤
@@ -139,7 +133,7 @@ The relational algebra includes two fundamental named relations: "true" and "fal
139133"true" is the name of the relation with no attributes and a set of one tuple of no attributes.
140134
141135```
142−TutorialD (master): :showexpr true
136+TutorialD (master/main): :showexpr true
143137┌┐
144138││
145139├┤
@@ -149,7 +143,7 @@ TutorialD (master): :showexpr true
149143"false" is the name of the relation with no attributes and an empty tuples set.
150144
151145```
152−TutorialD (master): :showexpr false
146+TutorialD (master/main): :showexpr false
153147┌┐
154148││
155149└┘
@@ -164,8 +158,8 @@ Database context expressions change the state of the database, much like "CREATE
164158#### Create a Relation Variable
165159
166160```
167−TutorialD (master): x:=relation{name Text, age Int}{tuple{name "Steve", age 40},tuple{name "Mike", age 31}}
168−TutorialD (master): :showexpr x
161+TutorialD (master/main): x:=relation{name Text, age Integer}{tuple{name "Steve", age 40},tuple{name "Mike", age 31}}
162+TutorialD (master/main): :showexpr x
169163┌────────┬──────────┐
170164│age::Int│name::Text│
171165├────────┼──────────┤
@@ -179,23 +173,25 @@ This is similar to SQL's "CREATE TABLE" operator.
179173#### Insert Additional Tuples
180174
181175```
182−TutorialD (master): x:=relation{name Text, age Int}{tuple{name "Steve", age 40},tuple{name "Mike", age 31}}
183−TutorialD (master): :showexpr x
184−┌────────┬──────────┐
185−│age::Int│name::Text│
186−├────────┼──────────┤
187−│40 │"Steve" │
188−│31 │"Mike" │
189−└────────┴──────────┘
190−TutorialD (master): insert x relation{tuple{name "Bob", age 24}}
191−TutorialD (master): :showexpr x
192−┌────────┬──────────┐
193−│age::Int│name::Text│
194−├────────┼──────────┤
195−│40 │"Steve" │
196−│24 │"Bob" │
197−│31 │"Mike" │
198−└────────┴──────────┘
176+TutorialD (master/main): x:=relation{name Text, age Integer}{tuple{name "Steve", age 40},tuple{name "Mike", age 31}}
177+TutorialD (master/main): :showexpr x
178+┌────────────┬──────────┐
179+│age::Integer│name::Text│
180+├────────────┼──────────┤
181+│31 │"Mike" │
182+│40 │"Steve" │
183+└────────────┴──────────┘
184+
185+TutorialD (master/main): insert x relation{tuple{name "Bob", age 24}}
186+TutorialD (master/main): :showexpr x
187+┌────────────┬──────────┐
188+│age::Integer│name::Text│
189+├────────────┼──────────┤
190+│31 │"Mike" │
191+│40 │"Steve" │
192+│24 │"Bob" │
193+└────────────┴──────────┘
194+
199195```
200196
201197Note that the relational insertion is identical to "x:=x union relation{...}".
@@ -203,51 +199,52 @@ Note that the relational insertion is identical to "x:=x union relation{...}".
203199#### Update Tuples in a Relation Variable
204200
205201```
206−TutorialD (master): :showexpr s
207−┌──────────┬────────┬───────────┬───────────┐
208−│city::Text│s#::Text│sname::Text│status::Int│
209−├──────────┼────────┼───────────┼───────────┤
210−│"Paris" │"S2" │"Jones" │10 │
211−│"Paris" │"S3" │"Blake" │30 │
212−│"London" │"S1" │"Smith" │20 │
213−│"London" │"S4" │"Clark" │20 │
214−│"Athens" │"S5" │"Adams" │30 │
215−└──────────┴────────┴───────────┴───────────┘
216−TutorialD (master): update s where city="London" (status:=35)
217−TutorialD (master): :showexpr s
218−┌──────────┬────────┬───────────┬───────────┐
219−│city::Text│s#::Text│sname::Text│status::Int│
220−├──────────┼────────┼───────────┼───────────┤
221−│"London" │"S4" │"Clark" │35 │
222−│"London" │"S1" │"Smith" │35 │
223−│"Paris" │"S2" │"Jones" │10 │
224−│"Paris" │"S3" │"Blake" │30 │
225−│"Athens" │"S5" │"Adams" │30 │
226−└──────────┴────────┴───────────┴───────────┘
202+TutorialD (master/main): :showexpr s
203+┌──────────┬────────┬───────────┬───────────────┐
204+│city::Text│s#::Text│sname::Text│status::Integer│
205+├──────────┼────────┼───────────┼───────────────┤
206+│"London" │"S1" │"Smith" │20 │
207+│"Athens" │"S5" │"Adams" │30 │
208+│"Paris" │"S3" │"Blake" │30 │
209+│"London" │"S4" │"Clark" │20 │
210+│"Paris" │"S2" │"Jones" │10 │
211+└──────────┴────────┴───────────┴───────────────┘
212+TutorialD (master/main): update s where city="London" (status:=35)
213+TutorialD (master/main): :showexpr s
214+┌──────────┬────────┬───────────┬───────────────┐
215+│city::Text│s#::Text│sname::Text│status::Integer│
216+├──────────┼────────┼───────────┼───────────────┤
217+│"Athens" │"S5" │"Adams" │30 │
218+│"London" │"S1" │"Smith" │35 │
219+│"London" │"S4" │"Clark" │35 │
220+│"Paris" │"S3" │"Blake" │30 │
221+│"Paris" │"S2" │"Jones" │10 │
222+└──────────┴────────┴───────────┴───────────────┘
223+
227224```
228225#### Deleting Tuples from a Relation Variable
229226
230227```
231−TutorialD (master): :showexpr s
232−┌──────────┬────────┬───────────┬───────────┐
233−│city::Text│s#::Text│sname::Text│status::Int│
234−├──────────┼────────┼───────────┼───────────┤
235−│"Paris" │"S2" │"Jones" │10 │
236−│"Paris" │"S3" │"Blake" │30 │
237−│"London" │"S1" │"Smith" │20 │
238−│"London" │"S4" │"Clark" │20 │
239−│"Athens" │"S5" │"Adams" │30 │
240−└──────────┴────────┴───────────┴───────────┘
241−TutorialD (master): delete s where sname="Adams"
242−TutorialD (master): :showexpr s
243−┌──────────┬────────┬───────────┬───────────┐
244−│city::Text│s#::Text│sname::Text│status::Int│
245−├──────────┼────────┼───────────┼───────────┤
246−│"Paris" │"S2" │"Jones" │10 │
247−│"Paris" │"S3" │"Blake" │30 │
248−│"London" │"S1" │"Smith" │20 │
249−│"London" │"S4" │"Clark" │20 │
250−└──────────┴────────┴───────────┴───────────┘
228+TutorialD (master/main): :showexpr s
229+┌──────────┬────────┬───────────┬───────────────┐
230+│city::Text│s#::Text│sname::Text│status::Integer│
231+├──────────┼────────┼───────────┼───────────────┤
232+│"Paris" │"S2" │"Jones" │10 │
233+│"Paris" │"S3" │"Blake" │30 │
234+│"London" │"S1" │"Smith" │20 │
235+│"Athens" │"S5" │"Adams" │30 │
236+│"London" │"S4" │"Clark" │20 │
237+└──────────┴────────┴───────────┴───────────────┘
238+TutorialD (master/main): delete s where sname="Adams"
239+TutorialD (master/main): :showexpr s
240+┌──────────┬────────┬───────────┬───────────────┐
241+│city::Text│s#::Text│sname::Text│status::Integer│
242+├──────────┼────────┼───────────┼───────────────┤
243+│"Paris" │"S2" │"Jones" │10 │
244+│"London" │"S4" │"Clark" │20 │
245+│"Paris" │"S3" │"Blake" │30 │
246+│"London" │"S1" │"Smith" │20 │
247+└──────────┴────────┴───────────┴───────────────┘
251248```
252249
253250### Execute Transaction Graph Expressions
@@ -257,20 +254,20 @@ Unlike typical SQL DBMSs, Project:M36 maintains a graph of transactions, similar
257254#### Committing
258255
259256```
260−TutorialD (master): :commit
257+TutorialD (master/main): :commit
261258```
262259
263260#### Rollback
264261
265262```
266−TutorialD (master): :rollback
263+TutorialD (master/main): :rollback
267264```
268265
269266#### Branching
270267
271268```
272−TutorialD (master): :branch experimental
273−TutorialD (experimental): employee:=relation{name Text, salary Int}
269+TutorialD (master/main): :branch experimental
270+TutorialD (experimental): employee:=relation{name Text, salary Integer}
274271TutorialD (experimental): :commit
275272```
276273
@@ -280,7 +277,7 @@ Note how the prompt changes to reflect the current branch's name.
280277
281278```
282279TutorialD (experimental): :jumphead master
283−TutorialD (master): :showexpr employee
280+TutorialD (master/main): :showexpr employee
284281ERR: RelVarNotDefinedError "employee"
285282```
286283
docs/acid_assessment.markdown+2−2
@@ -41,6 +41,6 @@ However, Project:M36 allows the user to disable fsync()'ing, for example, for th
4141
4242In addition, Project:M36 relies on the user to use Project:M36 databases on ordered, journaled metadata filesystems only. A future improvement could be to detect scenarios under which Project:M36 is not offering guaranteed durability. Write-ahead-logs do not suffer from this requirement.
4343
44−We feel that these potential pitfalls warrant removing an arbitrary 10% from the compliance scale because there is room for further improvement here. It is, however, possible to use Project:M36 with full durability guarantees.
44+Database directories can be shared across multiple Project:M36 database processes. This operates similarly to SQLite and relies on POSIX advisory locking and Windows file locking to ensure consistency.
4545
46−Compliance: 90%
46+Compliance: 100%
docs/atomfunctions.markdown+39−4
@@ -6,7 +6,7 @@ While Project:M36 includes a set of basic function which operate on relational v
66
77Other DBMSes also include this feature by way of stored functions such as with PL/pgsql, T-SQL, or PL/SQL.
88
9−Project:M36 allows users to implement strongly-typed and pure atom functions in the Haskell language at runtime. This facility makes use of GHC, the Haskell compiler, as a runtime service.
9+Project:M36 allows users to implement strongly-typed and pure atom functions in the Haskell language at runtime. This facility makes use of GHC, the Haskell compiler, as a runtime service. Alternatively, Haskell-based atom functions can be pre-compiled and loaded at runtime.
1010
1111## Atom Function Example
1212
@@ -15,10 +15,10 @@ In this example, we install an atom function to convert between Fahrenheit and C
1515We write the function giving it the name "celsiusToFahrenheit" with type ```Int -> Int``` which indicates to the compiler that the function take one ```Int``` argument value and returns one ```Int``` value. Finally, the body of the function is implemented in quotes or triple-quotes. Note that the function makes use of the "[ProjectM36.Base](/src/lib/ProjectM36/Base.hs)" module to handle the Atom type. The function must take a list of Atoms as arguments and return an Atom. The standard GHC Prelude is available in this AtomFunctionBody context.
1616
1717```
18−TutorialD (master): addatomfunction "celsiusToFahrenheit" Int -> Int """\((IntAtom c):_) -> IntAtom ( (c * 9 `div` 5) + 32)"""
18+TutorialD (master/main): addatomfunction "celsiusToFahrenheit" Int -> Either AtomFunctionError Int """(\((IntAtom c):_) -> pure $ IntAtom ( (c * 9 `div` 5) + 32)) :: [Atom] -> Either AtomFunctionError Atom"""
1919```
2020
21−Using triple-quotes allows quotes to be used inside the string without backslash escaping, which can become tedious.
21+Using triple-quotes allows quotes to be used inside the string without backslash escaping, which can become tedious. The sum type using ```Either``` allows the function to return an error, if necessary.
2222
2323## Advanced Atom Function Example
2424
@@ -30,11 +30,46 @@ In the following example, splitting the temperature values into two types make s
3030data CelsiusTemperature = CelsiusTemperature Int
3131data FahrenheitTemperature = FahrenheitTemperature Int
3232
33−addatomfunction "celsiusToFahrenheit" CelsiusTemperature -> FahrenheitTemperature """\(ConstructedAtom _ _ (IntAtom celsius:_):_) -> ConstructedAtom "Fahrenheit" (ConstructedAtomType "Fahrenheit" empty) [IntAtom (celsius * (9 `div` 5) + 32)] """
33+addatomfunction "celsiusToFahrenheit" CelsiusTemperature -> Either AtomFunctionError FahrenheitTemperature """(\(ConstructedAtom _ _ (IntAtom celsius:_):_) -> pure $ ConstructedAtom "Fahrenheit" (ConstructedAtomType "Fahrenheit" empty) [IntAtom (celsius * (9 `div` 5) + 32)]) :: [Atom] -> Either AtomFunctionError Atom """
3434```
3535
3636First, we define our new types and use these types in the function's type definition. Next, we deconstruct the incoming ```ConstructedAtom``` argument to extract its ```Int``` value. Finally, we perform the calculation and wrap the value in a new Fahrenheit-based ```ConstructedAtom```.
3737
38+Project:M36 also supports polymorphic types when used with atom functions. Here is an implementation of the veritable ```id``` function which merely returns its argument:
39+
40+```
41+addatomfunction "idTest" a -> Either AtomFunctionError a "(\(x:_) -> pure x) :: [Atom] -> Either AtomFunctionError Atom"
42+```
43+
44+## Pre-compiled Atom Functions
45+
46+Compiling atom functions at runtime can incur a performance cost. To mitigate this, atom functions can be compiled by GHC to object files and then loaded into the Project:M36 server. Let's look at an [example](https://github.com/agentm/project-m36/):
47+
48+```haskell
49+module DynamicAtomFunctions where
50+import ProjectM36.Base
51+
52+someAtomFunctions :: [AtomFunction]
53+someAtomFunctions = [AtomFunction{
54+ atomFuncName = "constTrue",
55+ atomFuncType = [TypeVariableType "a", BoolAtomType],
56+ atomFuncBody = AtomFunctionBody Nothing (\(x:_) -> pure (BoolAtom True))}]
57+```
58+
59+Any function inside any module which returns a list of `AtomFunction`s can be used to load more atom functions. First, create the Haskell object file:
60+
61+`cabal exec ghc -- examples/DynamicAtomFunctions.hs -package project-m36`
62+
63+Use cabal or stack to invoke ghc so that the project-m36 installed package will be found.
64+
65+Finally, connect to your Project:M36 database using the `tutd` client and run:
66+
67+`TutorialD (master/main): loadatomfunctions "DynamicAtomFunctions" "someFunctions" "examples/DynamicAtomFunctions.o"`
68+
69+If you see an error such as "unknown symbol", the version of the "project-m36" library installed in your sandbox is different from that with which you linked the object file. Make sure that the same versions are used in linking the server and object file.
70+
71+The atom function is now loaded and ready-to-use. Note, however, that the function must be added every time the project-m36-server starts. This will probably be improved in a future release.
72+
3873## Differences when compared to other DBMSes
3974
4075Project:M36 enforces strongly-typed atom functions. Specifically, atom functions must be pure (free of any side effects) and cannot operate on any variables other than the atoms passed in. This certainly sets stricter limits on what can be accomplished in an atom function when compared to stored functions in other DBMS products. For example, an atom function in Project:M36 would never be able to retrieve stock information from an external website because such a function cannot be pure and thus would be rejected by the atom function compiler. This restriction maintains the mathematical cohesiveness of the database and allows the DBMS to make performance-enhancing inferences it would not otherwise be able to make.
docs/basic_benchmarks.htmlnew file+1230
@@ -0,0 +1,1230 @@
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2+<html>
3+ <head>
4+ <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
5+ <title>criterion report</title>
6+ <script language="javascript" type="text/javascript">
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xmin=topSentry,ymin=topSentry,xmax=bottomSentry,ymax=bottomSentry;for(j=0;j<points.length;j+=ps){if(points[j]==null)continue;for(m=0;m<ps;++m){val=points[j+m];f=format[m];if(!f||f.autoscale===false||val==fakeInfinity||val==-fakeInfinity)continue;if(f.x){if(val<xmin)xmin=val;if(val>xmax)xmax=val}if(f.y){if(val<ymin)ymin=val;if(val>ymax)ymax=val}}}if(s.bars.show){var delta;switch(s.bars.align){case"left":delta=0;break;case"right":delta=-s.bars.barWidth;break;default:delta=-s.bars.barWidth/2}if(s.bars.horizontal){ymin+=delta;ymax+=delta+s.bars.barWidth}else{xmin+=delta;xmax+=delta+s.bars.barWidth}}updateAxis(s.xaxis,xmin,xmax);updateAxis(s.yaxis,ymin,ymax)}$.each(allAxes(),function(_,axis){if(axis.datamin==topSentry)axis.datamin=null;if(axis.datamax==bottomSentry)axis.datamax=null})}function setupCanvases(){placeholder.css("padding",0).children().filter(function(){return!$(this).hasClass("flot-overlay")&&!$(this).hasClass("flot-base")}).remove();if(placeholder.css("position")=="static")placeholder.css("position","relative");surface=new Canvas("flot-base",placeholder);overlay=new Canvas("flot-overlay",placeholder);ctx=surface.context;octx=overlay.context;eventHolder=$(overlay.element).unbind();var existing=placeholder.data("plot");if(existing){existing.shutdown();overlay.clear()}placeholder.data("plot",plot)}function bindEvents(){if(options.grid.hoverable){eventHolder.mousemove(onMouseMove);eventHolder.bind("mouseleave",onMouseLeave)}if(options.grid.clickable)eventHolder.click(onClick);executeHooks(hooks.bindEvents,[eventHolder])}function shutdown(){if(redrawTimeout)clearTimeout(redrawTimeout);eventHolder.unbind("mousemove",onMouseMove);eventHolder.unbind("mouseleave",onMouseLeave);eventHolder.unbind("click",onClick);executeHooks(hooks.shutdown,[eventHolder])}function setTransformationHelpers(axis){function identity(x){return x}var s,m,t=axis.options.transform||identity,it=axis.options.inverseTransform;if(axis.direction=="x"){s=axis.scale=plotWidth/Math.abs(t(axis.max)-t(axis.min));m=Math.min(t(axis.max),t(axis.min))}else{s=axis.scale=plotHeight/Math.abs(t(axis.max)-t(axis.min));s=-s;m=Math.max(t(axis.max),t(axis.min))}if(t==identity)axis.p2c=function(p){return(p-m)*s};else axis.p2c=function(p){return(t(p)-m)*s};if(!it)axis.c2p=function(c){return m+c/s};else axis.c2p=function(c){return it(m+c/s)}}function measureTickLabels(axis){var opts=axis.options,ticks=axis.ticks||[],labelWidth=opts.labelWidth||0,labelHeight=opts.labelHeight||0,maxWidth=labelWidth||(axis.direction=="x"?Math.floor(surface.width/(ticks.length||1)):null),legacyStyles=axis.direction+"Axis "+axis.direction+axis.n+"Axis",layer="flot-"+axis.direction+"-axis flot-"+axis.direction+axis.n+"-axis "+legacyStyles,font=opts.font||"flot-tick-label tickLabel";for(var i=0;i<ticks.length;++i){var t=ticks[i];if(!t.label)continue;var info=surface.getTextInfo(layer,t.label,font,null,maxWidth);labelWidth=Math.max(labelWidth,info.width);labelHeight=Math.max(labelHeight,info.height)}axis.labelWidth=opts.labelWidth||labelWidth;axis.labelHeight=opts.labelHeight||labelHeight}function allocateAxisBoxFirstPhase(axis){var lw=axis.labelWidth,lh=axis.labelHeight,pos=axis.options.position,isXAxis=axis.direction==="x",tickLength=axis.options.tickLength,axisMargin=options.grid.axisMargin,padding=options.grid.labelMargin,innermost=true,outermost=true,first=true,found=false;$.each(isXAxis?xaxes:yaxes,function(i,a){if(a&&(a.show||a.reserveSpace)){if(a===axis){found=true}else if(a.options.position===pos){if(found){outermost=false}else{innermost=false}}if(!found){first=false}}});if(outermost){axisMargin=0}if(tickLength==null){tickLength=first?"full":5}if(!isNaN(+tickLength))padding+=+tickLength;if(isXAxis){lh+=padding;if(pos=="bottom"){plotOffset.bottom+=lh+axisMargin;axis.box={top:surface.height-plotOffset.bottom,height:lh}}else{axis.box={top:plotOffset.top+axisMargin,height:lh};plotOffset.top+=lh+axisMargin}}else{lw+=padding;if(pos=="left"){axis.box={left:plotOffset.left+axisMargin,width:lw};plotOffset.left+=lw+axisMargin}else{plotOffset.right+=lw+axisMargin;axis.box={left:surface.width-plotOffset.right,width:lw}}}axis.position=pos;axis.tickLength=tickLength;axis.box.padding=padding;axis.innermost=innermost}function allocateAxisBoxSecondPhase(axis){if(axis.direction=="x"){axis.box.left=plotOffset.left-axis.labelWidth/2;axis.box.width=surface.width-plotOffset.left-plotOffset.right+axis.labelWidth}else{axis.box.top=plotOffset.top-axis.labelHeight/2;axis.box.height=surface.height-plotOffset.bottom-plotOffset.top+axis.labelHeight}}function adjustLayoutForThingsStickingOut(){var minMargin=options.grid.minBorderMargin,axis,i;if(minMargin==null){minMargin=0;for(i=0;i<series.length;++i)minMargin=Math.max(minMargin,2*(series[i].points.radius+series[i].points.lineWidth/2))}var margins={left:minMargin,right:minMargin,top:minMargin,bottom:minMargin};$.each(allAxes(),function(_,axis){if(axis.reserveSpace&&axis.ticks&&axis.ticks.length){if(axis.direction==="x"){margins.left=Math.max(margins.left,axis.labelWidth/2);margins.right=Math.max(margins.right,axis.labelWidth/2)}else{margins.bottom=Math.max(margins.bottom,axis.labelHeight/2);margins.top=Math.max(margins.top,axis.labelHeight/2)}}});plotOffset.left=Math.ceil(Math.max(margins.left,plotOffset.left));plotOffset.right=Math.ceil(Math.max(margins.right,plotOffset.right));plotOffset.top=Math.ceil(Math.max(margins.top,plotOffset.top));plotOffset.bottom=Math.ceil(Math.max(margins.bottom,plotOffset.bottom))}function setupGrid(){var i,axes=allAxes(),showGrid=options.grid.show;for(var a in plotOffset){var margin=options.grid.margin||0;plotOffset[a]=typeof margin=="number"?margin:margin[a]||0}executeHooks(hooks.processOffset,[plotOffset]);for(var a in plotOffset){if(typeof options.grid.borderWidth=="object"){plotOffset[a]+=showGrid?options.grid.borderWidth[a]:0}else{plotOffset[a]+=showGrid?options.grid.borderWidth:0}}$.each(axes,function(_,axis){var axisOpts=axis.options;axis.show=axisOpts.show==null?axis.used:axisOpts.show;axis.reserveSpace=axisOpts.reserveSpace==null?axis.show:axisOpts.reserveSpace;setRange(axis)});if(showGrid){var allocatedAxes=$.grep(axes,function(axis){return axis.show||axis.reserveSpace});$.each(allocatedAxes,function(_,axis){setupTickGeneration(axis);setTicks(axis);snapRangeToTicks(axis,axis.ticks);measureTickLabels(axis)});for(i=allocatedAxes.length-1;i>=0;--i)allocateAxisBoxFirstPhase(allocatedAxes[i]);adjustLayoutForThingsStickingOut();$.each(allocatedAxes,function(_,axis){allocateAxisBoxSecondPhase(axis)})}plotWidth=surface.width-plotOffset.left-plotOffset.right;plotHeight=surface.height-plotOffset.bottom-plotOffset.top;$.each(axes,function(_,axis){setTransformationHelpers(axis)});if(showGrid){drawAxisLabels()}insertLegend()}function setRange(axis){var opts=axis.options,min=+(opts.min!=null?opts.min:axis.datamin),max=+(opts.max!=null?opts.max:axis.datamax),delta=max-min;if(delta==0){var widen=max==0?1:.01;if(opts.min==null)min-=widen;if(opts.max==null||opts.min!=null)max+=widen}else{var margin=opts.autoscaleMargin;if(margin!=null){if(opts.min==null){min-=delta*margin;if(min<0&&axis.datamin!=null&&axis.datamin>=0)min=0}if(opts.max==null){max+=delta*margin;if(max>0&&axis.datamax!=null&&axis.datamax<=0)max=0}}}axis.min=min;axis.max=max}function setupTickGeneration(axis){var opts=axis.options;var noTicks;if(typeof opts.ticks=="number"&&opts.ticks>0)noTicks=opts.ticks;else noTicks=.3*Math.sqrt(axis.direction=="x"?surface.width:surface.height);var delta=(axis.max-axis.min)/noTicks,dec=-Math.floor(Math.log(delta)/Math.LN10),maxDec=opts.tickDecimals;if(maxDec!=null&&dec>maxDec){dec=maxDec}var magn=Math.pow(10,-dec),norm=delta/magn,size;if(norm<1.5){size=1}else if(norm<3){size=2;if(norm>2.25&&(maxDec==null||dec+1<=maxDec)){size=2.5;++dec}}else if(norm<7.5){size=5}else{size=10}size*=magn;if(opts.minTickSize!=null&&size<opts.minTickSize){size=opts.minTickSize}axis.delta=delta;axis.tickDecimals=Math.max(0,maxDec!=null?maxDec:dec);axis.tickSize=opts.tickSize||size;if(opts.mode=="time"&&!axis.tickGenerator){throw new Error("Time mode requires the flot.time plugin.")}if(!axis.tickGenerator){axis.tickGenerator=function(axis){var ticks=[],start=floorInBase(axis.min,axis.tickSize),i=0,v=Number.NaN,prev;do{prev=v;v=start+i*axis.tickSize;ticks.push(v);++i}while(v<axis.max&&v!=prev);return ticks};axis.tickFormatter=function(value,axis){var factor=axis.tickDecimals?Math.pow(10,axis.tickDecimals):1;var formatted=""+Math.round(value*factor)/factor;if(axis.tickDecimals!=null){var decimal=formatted.indexOf(".");var precision=decimal==-1?0:formatted.length-decimal-1;if(precision<axis.tickDecimals){return(precision?formatted:formatted+".")+(""+factor).substr(1,axis.tickDecimals-precision)}}return formatted}}if($.isFunction(opts.tickFormatter))axis.tickFormatter=function(v,axis){return""+opts.tickFormatter(v,axis)};if(opts.alignTicksWithAxis!=null){var otherAxis=(axis.direction=="x"?xaxes:yaxes)[opts.alignTicksWithAxis-1];if(otherAxis&&otherAxis.used&&otherAxis!=axis){var niceTicks=axis.tickGenerator(axis);if(niceTicks.length>0){if(opts.min==null)axis.min=Math.min(axis.min,niceTicks[0]);if(opts.max==null&&niceTicks.length>1)axis.max=Math.max(axis.max,niceTicks[niceTicks.length-1])}axis.tickGenerator=function(axis){var ticks=[],v,i;for(i=0;i<otherAxis.ticks.length;++i){v=(otherAxis.ticks[i].v-otherAxis.min)/(otherAxis.max-otherAxis.min);v=axis.min+v*(axis.max-axis.min);ticks.push(v)}return ticks};if(!axis.mode&&opts.tickDecimals==null){var extraDec=Math.max(0,-Math.floor(Math.log(axis.delta)/Math.LN10)+1),ts=axis.tickGenerator(axis);if(!(ts.length>1&&/\..*0$/.test((ts[1]-ts[0]).toFixed(extraDec))))axis.tickDecimals=extraDec}}}}function setTicks(axis){var oticks=axis.options.ticks,ticks=[];if(oticks==null||typeof oticks=="number"&&oticks>0)ticks=axis.tickGenerator(axis);else if(oticks){if($.isFunction(oticks))ticks=oticks(axis);else ticks=oticks}var i,v;axis.ticks=[];for(i=0;i<ticks.length;++i){var label=null;var t=ticks[i];if(typeof t=="object"){v=+t[0];if(t.length>1)label=t[1]}else v=+t;if(label==null)label=axis.tickFormatter(v,axis);if(!isNaN(v))axis.ticks.push({v:v,label:label})}}function snapRangeToTicks(axis,ticks){if(axis.options.autoscaleMargin&&ticks.length>0){if(axis.options.min==null)axis.min=Math.min(axis.min,ticks[0].v);if(axis.options.max==null&&ticks.length>1)axis.max=Math.max(axis.max,ticks[ticks.length-1].v)}}function draw(){surface.clear();executeHooks(hooks.drawBackground,[ctx]);var grid=options.grid;if(grid.show&&grid.backgroundColor)drawBackground();if(grid.show&&!grid.aboveData){drawGrid()}for(var i=0;i<series.length;++i){executeHooks(hooks.drawSeries,[ctx,series[i]]);drawSeries(series[i])}executeHooks(hooks.draw,[ctx]);if(grid.show&&grid.aboveData){drawGrid()}surface.render();triggerRedrawOverlay()}function extractRange(ranges,coord){var axis,from,to,key,axes=allAxes();for(var i=0;i<axes.length;++i){axis=axes[i];if(axis.direction==coord){key=coord+axis.n+"axis";if(!ranges[key]&&axis.n==1)key=coord+"axis";if(ranges[key]){from=ranges[key].from;to=ranges[key].to;break}}}if(!ranges[key]){axis=coord=="x"?xaxes[0]:yaxes[0];from=ranges[coord+"1"];to=ranges[coord+"2"]}if(from!=null&&to!=null&&from>to){var tmp=from;from=to;to=tmp}return{from:from,to:to,axis:axis}}function drawBackground(){ctx.save();ctx.translate(plotOffset.left,plotOffset.top);ctx.fillStyle=getColorOrGradient(options.grid.backgroundColor,plotHeight,0,"rgba(255, 255, 255, 0)");ctx.fillRect(0,0,plotWidth,plotHeight);ctx.restore()}function drawGrid(){var i,axes,bw,bc;ctx.save();ctx.translate(plotOffset.left,plotOffset.top);var markings=options.grid.markings;if(markings){if($.isFunction(markings)){axes=plot.getAxes();axes.xmin=axes.xaxis.min;axes.xmax=axes.xaxis.max;axes.ymin=axes.yaxis.min;axes.ymax=axes.yaxis.max;markings=markings(axes)}for(i=0;i<markings.length;++i){var m=markings[i],xrange=extractRange(m,"x"),yrange=extractRange(m,"y");if(xrange.from==null)xrange.from=xrange.axis.min;if(xrange.to==null)xrange.to=xrange.axis.max;
21+if(yrange.from==null)yrange.from=yrange.axis.min;if(yrange.to==null)yrange.to=yrange.axis.max;if(xrange.to<xrange.axis.min||xrange.from>xrange.axis.max||yrange.to<yrange.axis.min||yrange.from>yrange.axis.max)continue;xrange.from=Math.max(xrange.from,xrange.axis.min);xrange.to=Math.min(xrange.to,xrange.axis.max);yrange.from=Math.max(yrange.from,yrange.axis.min);yrange.to=Math.min(yrange.to,yrange.axis.max);var xequal=xrange.from===xrange.to,yequal=yrange.from===yrange.to;if(xequal&&yequal){continue}xrange.from=Math.floor(xrange.axis.p2c(xrange.from));xrange.to=Math.floor(xrange.axis.p2c(xrange.to));yrange.from=Math.floor(yrange.axis.p2c(yrange.from));yrange.to=Math.floor(yrange.axis.p2c(yrange.to));if(xequal||yequal){var lineWidth=m.lineWidth||options.grid.markingsLineWidth,subPixel=lineWidth%2?.5:0;ctx.beginPath();ctx.strokeStyle=m.color||options.grid.markingsColor;ctx.lineWidth=lineWidth;if(xequal){ctx.moveTo(xrange.to+subPixel,yrange.from);ctx.lineTo(xrange.to+subPixel,yrange.to)}else{ctx.moveTo(xrange.from,yrange.to+subPixel);ctx.lineTo(xrange.to,yrange.to+subPixel)}ctx.stroke()}else{ctx.fillStyle=m.color||options.grid.markingsColor;ctx.fillRect(xrange.from,yrange.to,xrange.to-xrange.from,yrange.from-yrange.to)}}}axes=allAxes();bw=options.grid.borderWidth;for(var j=0;j<axes.length;++j){var axis=axes[j],box=axis.box,t=axis.tickLength,x,y,xoff,yoff;if(!axis.show||axis.ticks.length==0)continue;ctx.lineWidth=1;if(axis.direction=="x"){x=0;if(t=="full")y=axis.position=="top"?0:plotHeight;else y=box.top-plotOffset.top+(axis.position=="top"?box.height:0)}else{y=0;if(t=="full")x=axis.position=="left"?0:plotWidth;else x=box.left-plotOffset.left+(axis.position=="left"?box.width:0)}if(!axis.innermost){ctx.strokeStyle=axis.options.color;ctx.beginPath();xoff=yoff=0;if(axis.direction=="x")xoff=plotWidth+1;else yoff=plotHeight+1;if(ctx.lineWidth==1){if(axis.direction=="x"){y=Math.floor(y)+.5}else{x=Math.floor(x)+.5}}ctx.moveTo(x,y);ctx.lineTo(x+xoff,y+yoff);ctx.stroke()}ctx.strokeStyle=axis.options.tickColor;ctx.beginPath();for(i=0;i<axis.ticks.length;++i){var v=axis.ticks[i].v;xoff=yoff=0;if(isNaN(v)||v<axis.min||v>axis.max||t=="full"&&(typeof bw=="object"&&bw[axis.position]>0||bw>0)&&(v==axis.min||v==axis.max))continue;if(axis.direction=="x"){x=axis.p2c(v);yoff=t=="full"?-plotHeight:t;if(axis.position=="top")yoff=-yoff}else{y=axis.p2c(v);xoff=t=="full"?-plotWidth:t;if(axis.position=="left")xoff=-xoff}if(ctx.lineWidth==1){if(axis.direction=="x")x=Math.floor(x)+.5;else y=Math.floor(y)+.5}ctx.moveTo(x,y);ctx.lineTo(x+xoff,y+yoff)}ctx.stroke()}if(bw){bc=options.grid.borderColor;if(typeof bw=="object"||typeof bc=="object"){if(typeof bw!=="object"){bw={top:bw,right:bw,bottom:bw,left:bw}}if(typeof bc!=="object"){bc={top:bc,right:bc,bottom:bc,left:bc}}if(bw.top>0){ctx.strokeStyle=bc.top;ctx.lineWidth=bw.top;ctx.beginPath();ctx.moveTo(0-bw.left,0-bw.top/2);ctx.lineTo(plotWidth,0-bw.top/2);ctx.stroke()}if(bw.right>0){ctx.strokeStyle=bc.right;ctx.lineWidth=bw.right;ctx.beginPath();ctx.moveTo(plotWidth+bw.right/2,0-bw.top);ctx.lineTo(plotWidth+bw.right/2,plotHeight);ctx.stroke()}if(bw.bottom>0){ctx.strokeStyle=bc.bottom;ctx.lineWidth=bw.bottom;ctx.beginPath();ctx.moveTo(plotWidth+bw.right,plotHeight+bw.bottom/2);ctx.lineTo(0,plotHeight+bw.bottom/2);ctx.stroke()}if(bw.left>0){ctx.strokeStyle=bc.left;ctx.lineWidth=bw.left;ctx.beginPath();ctx.moveTo(0-bw.left/2,plotHeight+bw.bottom);ctx.lineTo(0-bw.left/2,0);ctx.stroke()}}else{ctx.lineWidth=bw;ctx.strokeStyle=options.grid.borderColor;ctx.strokeRect(-bw/2,-bw/2,plotWidth+bw,plotHeight+bw)}}ctx.restore()}function drawAxisLabels(){$.each(allAxes(),function(_,axis){var box=axis.box,legacyStyles=axis.direction+"Axis "+axis.direction+axis.n+"Axis",layer="flot-"+axis.direction+"-axis flot-"+axis.direction+axis.n+"-axis "+legacyStyles,font=axis.options.font||"flot-tick-label tickLabel",tick,x,y,halign,valign;surface.removeText(layer);if(!axis.show||axis.ticks.length==0)return;for(var i=0;i<axis.ticks.length;++i){tick=axis.ticks[i];if(!tick.label||tick.v<axis.min||tick.v>axis.max)continue;if(axis.direction=="x"){halign="center";x=plotOffset.left+axis.p2c(tick.v);if(axis.position=="bottom"){y=box.top+box.padding}else{y=box.top+box.height-box.padding;valign="bottom"}}else{valign="middle";y=plotOffset.top+axis.p2c(tick.v);if(axis.position=="left"){x=box.left+box.width-box.padding;halign="right"}else{x=box.left+box.padding}}surface.addText(layer,x,y,tick.label,font,null,null,halign,valign)}})}function drawSeries(series){if(series.lines.show)drawSeriesLines(series);if(series.bars.show)drawSeriesBars(series);if(series.points.show)drawSeriesPoints(series)}function drawSeriesLines(series){function plotLine(datapoints,xoffset,yoffset,axisx,axisy){var points=datapoints.points,ps=datapoints.pointsize,prevx=null,prevy=null;ctx.beginPath();for(var i=ps;i<points.length;i+=ps){var x1=points[i-ps],y1=points[i-ps+1],x2=points[i],y2=points[i+1];if(x1==null||x2==null)continue;if(y1<=y2&&y1<axisy.min){if(y2<axisy.min)continue;x1=(axisy.min-y1)/(y2-y1)*(x2-x1)+x1;y1=axisy.min}else if(y2<=y1&&y2<axisy.min){if(y1<axisy.min)continue;x2=(axisy.min-y1)/(y2-y1)*(x2-x1)+x1;y2=axisy.min}if(y1>=y2&&y1>axisy.max){if(y2>axisy.max)continue;x1=(axisy.max-y1)/(y2-y1)*(x2-x1)+x1;y1=axisy.max}else if(y2>=y1&&y2>axisy.max){if(y1>axisy.max)continue;x2=(axisy.max-y1)/(y2-y1)*(x2-x1)+x1;y2=axisy.max}if(x1<=x2&&x1<axisx.min){if(x2<axisx.min)continue;y1=(axisx.min-x1)/(x2-x1)*(y2-y1)+y1;x1=axisx.min}else if(x2<=x1&&x2<axisx.min){if(x1<axisx.min)continue;y2=(axisx.min-x1)/(x2-x1)*(y2-y1)+y1;x2=axisx.min}if(x1>=x2&&x1>axisx.max){if(x2>axisx.max)continue;y1=(axisx.max-x1)/(x2-x1)*(y2-y1)+y1;x1=axisx.max}else if(x2>=x1&&x2>axisx.max){if(x1>axisx.max)continue;y2=(axisx.max-x1)/(x2-x1)*(y2-y1)+y1;x2=axisx.max}if(x1!=prevx||y1!=prevy)ctx.moveTo(axisx.p2c(x1)+xoffset,axisy.p2c(y1)+yoffset);prevx=x2;prevy=y2;ctx.lineTo(axisx.p2c(x2)+xoffset,axisy.p2c(y2)+yoffset)}ctx.stroke()}function plotLineArea(datapoints,axisx,axisy){var points=datapoints.points,ps=datapoints.pointsize,bottom=Math.min(Math.max(0,axisy.min),axisy.max),i=0,top,areaOpen=false,ypos=1,segmentStart=0,segmentEnd=0;while(true){if(ps>0&&i>points.length+ps)break;i+=ps;var x1=points[i-ps],y1=points[i-ps+ypos],x2=points[i],y2=points[i+ypos];if(areaOpen){if(ps>0&&x1!=null&&x2==null){segmentEnd=i;ps=-ps;ypos=2;continue}if(ps<0&&i==segmentStart+ps){ctx.fill();areaOpen=false;ps=-ps;ypos=1;i=segmentStart=segmentEnd+ps;continue}}if(x1==null||x2==null)continue;if(x1<=x2&&x1<axisx.min){if(x2<axisx.min)continue;y1=(axisx.min-x1)/(x2-x1)*(y2-y1)+y1;x1=axisx.min}else if(x2<=x1&&x2<axisx.min){if(x1<axisx.min)continue;y2=(axisx.min-x1)/(x2-x1)*(y2-y1)+y1;x2=axisx.min}if(x1>=x2&&x1>axisx.max){if(x2>axisx.max)continue;y1=(axisx.max-x1)/(x2-x1)*(y2-y1)+y1;x1=axisx.max}else if(x2>=x1&&x2>axisx.max){if(x1>axisx.max)continue;y2=(axisx.max-x1)/(x2-x1)*(y2-y1)+y1;x2=axisx.max}if(!areaOpen){ctx.beginPath();ctx.moveTo(axisx.p2c(x1),axisy.p2c(bottom));areaOpen=true}if(y1>=axisy.max&&y2>=axisy.max){ctx.lineTo(axisx.p2c(x1),axisy.p2c(axisy.max));ctx.lineTo(axisx.p2c(x2),axisy.p2c(axisy.max));continue}else if(y1<=axisy.min&&y2<=axisy.min){ctx.lineTo(axisx.p2c(x1),axisy.p2c(axisy.min));ctx.lineTo(axisx.p2c(x2),axisy.p2c(axisy.min));continue}var x1old=x1,x2old=x2;if(y1<=y2&&y1<axisy.min&&y2>=axisy.min){x1=(axisy.min-y1)/(y2-y1)*(x2-x1)+x1;y1=axisy.min}else if(y2<=y1&&y2<axisy.min&&y1>=axisy.min){x2=(axisy.min-y1)/(y2-y1)*(x2-x1)+x1;y2=axisy.min}if(y1>=y2&&y1>axisy.max&&y2<=axisy.max){x1=(axisy.max-y1)/(y2-y1)*(x2-x1)+x1;y1=axisy.max}else if(y2>=y1&&y2>axisy.max&&y1<=axisy.max){x2=(axisy.max-y1)/(y2-y1)*(x2-x1)+x1;y2=axisy.max}if(x1!=x1old){ctx.lineTo(axisx.p2c(x1old),axisy.p2c(y1))}ctx.lineTo(axisx.p2c(x1),axisy.p2c(y1));ctx.lineTo(axisx.p2c(x2),axisy.p2c(y2));if(x2!=x2old){ctx.lineTo(axisx.p2c(x2),axisy.p2c(y2));ctx.lineTo(axisx.p2c(x2old),axisy.p2c(y2))}}}ctx.save();ctx.translate(plotOffset.left,plotOffset.top);ctx.lineJoin="round";var lw=series.lines.lineWidth,sw=series.shadowSize;if(lw>0&&sw>0){ctx.lineWidth=sw;ctx.strokeStyle="rgba(0,0,0,0.1)";var angle=Math.PI/18;plotLine(series.datapoints,Math.sin(angle)*(lw/2+sw/2),Math.cos(angle)*(lw/2+sw/2),series.xaxis,series.yaxis);ctx.lineWidth=sw/2;plotLine(series.datapoints,Math.sin(angle)*(lw/2+sw/4),Math.cos(angle)*(lw/2+sw/4),series.xaxis,series.yaxis)}ctx.lineWidth=lw;ctx.strokeStyle=series.color;var fillStyle=getFillStyle(series.lines,series.color,0,plotHeight);if(fillStyle){ctx.fillStyle=fillStyle;plotLineArea(series.datapoints,series.xaxis,series.yaxis)}if(lw>0)plotLine(series.datapoints,0,0,series.xaxis,series.yaxis);ctx.restore()}function drawSeriesPoints(series){function plotPoints(datapoints,radius,fillStyle,offset,shadow,axisx,axisy,symbol){var points=datapoints.points,ps=datapoints.pointsize;for(var i=0;i<points.length;i+=ps){var x=points[i],y=points[i+1];if(x==null||x<axisx.min||x>axisx.max||y<axisy.min||y>axisy.max)continue;ctx.beginPath();x=axisx.p2c(x);y=axisy.p2c(y)+offset;if(symbol=="circle")ctx.arc(x,y,radius,0,shadow?Math.PI:Math.PI*2,false);else symbol(ctx,x,y,radius,shadow);ctx.closePath();if(fillStyle){ctx.fillStyle=fillStyle;ctx.fill()}ctx.stroke()}}ctx.save();ctx.translate(plotOffset.left,plotOffset.top);var lw=series.points.lineWidth,sw=series.shadowSize,radius=series.points.radius,symbol=series.points.symbol;if(lw==0)lw=1e-4;if(lw>0&&sw>0){var w=sw/2;ctx.lineWidth=w;ctx.strokeStyle="rgba(0,0,0,0.1)";plotPoints(series.datapoints,radius,null,w+w/2,true,series.xaxis,series.yaxis,symbol);ctx.strokeStyle="rgba(0,0,0,0.2)";plotPoints(series.datapoints,radius,null,w/2,true,series.xaxis,series.yaxis,symbol)}ctx.lineWidth=lw;ctx.strokeStyle=series.color;plotPoints(series.datapoints,radius,getFillStyle(series.points,series.color),0,false,series.xaxis,series.yaxis,symbol);ctx.restore()}function drawBar(x,y,b,barLeft,barRight,fillStyleCallback,axisx,axisy,c,horizontal,lineWidth){var left,right,bottom,top,drawLeft,drawRight,drawTop,drawBottom,tmp;if(horizontal){drawBottom=drawRight=drawTop=true;drawLeft=false;left=b;right=x;top=y+barLeft;bottom=y+barRight;if(right<left){tmp=right;right=left;left=tmp;drawLeft=true;drawRight=false}}else{drawLeft=drawRight=drawTop=true;drawBottom=false;left=x+barLeft;right=x+barRight;bottom=b;top=y;if(top<bottom){tmp=top;top=bottom;bottom=tmp;drawBottom=true;drawTop=false}}if(right<axisx.min||left>axisx.max||top<axisy.min||bottom>axisy.max)return;if(left<axisx.min){left=axisx.min;drawLeft=false}if(right>axisx.max){right=axisx.max;drawRight=false}if(bottom<axisy.min){bottom=axisy.min;drawBottom=false}if(top>axisy.max){top=axisy.max;drawTop=false}left=axisx.p2c(left);bottom=axisy.p2c(bottom);right=axisx.p2c(right);top=axisy.p2c(top);if(fillStyleCallback){c.fillStyle=fillStyleCallback(bottom,top);c.fillRect(left,top,right-left,bottom-top)}if(lineWidth>0&&(drawLeft||drawRight||drawTop||drawBottom)){c.beginPath();c.moveTo(left,bottom);if(drawLeft)c.lineTo(left,top);else c.moveTo(left,top);if(drawTop)c.lineTo(right,top);else c.moveTo(right,top);if(drawRight)c.lineTo(right,bottom);else c.moveTo(right,bottom);if(drawBottom)c.lineTo(left,bottom);else c.moveTo(left,bottom);c.stroke()}}function drawSeriesBars(series){function plotBars(datapoints,barLeft,barRight,fillStyleCallback,axisx,axisy){var points=datapoints.points,ps=datapoints.pointsize;for(var i=0;i<points.length;i+=ps){if(points[i]==null)continue;drawBar(points[i],points[i+1],points[i+2],barLeft,barRight,fillStyleCallback,axisx,axisy,ctx,series.bars.horizontal,series.bars.lineWidth)}}ctx.save();ctx.translate(plotOffset.left,plotOffset.top);ctx.lineWidth=series.bars.lineWidth;ctx.strokeStyle=series.color;var barLeft;switch(series.bars.align){case"left":barLeft=0;break;case"right":barLeft=-series.bars.barWidth;break;default:barLeft=-series.bars.barWidth/2}var fillStyleCallback=series.bars.fill?function(bottom,top){return getFillStyle(series.bars,series.color,bottom,top)}:null;plotBars(series.datapoints,barLeft,barLeft+series.bars.barWidth,fillStyleCallback,series.xaxis,series.yaxis);ctx.restore()}function getFillStyle(filloptions,seriesColor,bottom,top){var fill=filloptions.fill;if(!fill)return null;if(filloptions.fillColor)return getColorOrGradient(filloptions.fillColor,bottom,top,seriesColor);var c=$.color.parse(seriesColor);c.a=typeof fill=="number"?fill:.4;c.normalize();return c.toString()}function insertLegend(){if(options.legend.container!=null){$(options.legend.container).html("")}else{placeholder.find(".legend").remove()}if(!options.legend.show){return}var fragments=[],entries=[],rowStarted=false,lf=options.legend.labelFormatter,s,label;for(var i=0;i<series.length;++i){s=series[i];if(s.label){label=lf?lf(s.label,s):s.label;if(label){entries.push({label:label,color:s.color})}}}if(options.legend.sorted){if($.isFunction(options.legend.sorted)){entries.sort(options.legend.sorted)}else if(options.legend.sorted=="reverse"){entries.reverse()}else{var ascending=options.legend.sorted!="descending";entries.sort(function(a,b){return a.label==b.label?0:a.label<b.label!=ascending?1:-1})}}for(var i=0;i<entries.length;++i){var entry=entries[i];if(i%options.legend.noColumns==0){if(rowStarted)fragments.push("</tr>");fragments.push("<tr>");rowStarted=true}fragments.push('<td class="legendColorBox"><div style="border:1px solid '+options.legend.labelBoxBorderColor+';padding:1px"><div style="width:4px;height:0;border:5px solid '+entry.color+';overflow:hidden"></div></div></td>'+'<td class="legendLabel">'+entry.label+"</td>")}if(rowStarted)fragments.push("</tr>");if(fragments.length==0)return;var table='<table style="font-size:smaller;color:'+options.grid.color+'">'+fragments.join("")+"</table>";if(options.legend.container!=null)$(options.legend.container).html(table);else{var pos="",p=options.legend.position,m=options.legend.margin;if(m[0]==null)m=[m,m];if(p.charAt(0)=="n")pos+="top:"+(m[1]+plotOffset.top)+"px;";else if(p.charAt(0)=="s")pos+="bottom:"+(m[1]+plotOffset.bottom)+"px;";if(p.charAt(1)=="e")pos+="right:"+(m[0]+plotOffset.right)+"px;";else if(p.charAt(1)=="w")pos+="left:"+(m[0]+plotOffset.left)+"px;";var legend=$('<div class="legend">'+table.replace('style="','style="position:absolute;'+pos+";")+"</div>").appendTo(placeholder);if(options.legend.backgroundOpacity!=0){var c=options.legend.backgroundColor;if(c==null){c=options.grid.backgroundColor;if(c&&typeof c=="string")c=$.color.parse(c);else c=$.color.extract(legend,"background-color");c.a=1;c=c.toString()}var div=legend.children();$('<div style="position:absolute;width:'+div.width()+"px;height:"+div.height()+"px;"+pos+"background-color:"+c+';"> </div>').prependTo(legend).css("opacity",options.legend.backgroundOpacity)}}}var highlights=[],redrawTimeout=null;function findNearbyItem(mouseX,mouseY,seriesFilter){var maxDistance=options.grid.mouseActiveRadius,smallestDistance=maxDistance*maxDistance+1,item=null,foundPoint=false,i,j,ps;for(i=series.length-1;i>=0;--i){if(!seriesFilter(series[i]))continue;var s=series[i],axisx=s.xaxis,axisy=s.yaxis,points=s.datapoints.points,mx=axisx.c2p(mouseX),my=axisy.c2p(mouseY),maxx=maxDistance/axisx.scale,maxy=maxDistance/axisy.scale;ps=s.datapoints.pointsize;if(axisx.options.inverseTransform)maxx=Number.MAX_VALUE;if(axisy.options.inverseTransform)maxy=Number.MAX_VALUE;if(s.lines.show||s.points.show){for(j=0;j<points.length;j+=ps){var x=points[j],y=points[j+1];if(x==null)continue;if(x-mx>maxx||x-mx<-maxx||y-my>maxy||y-my<-maxy)continue;var dx=Math.abs(axisx.p2c(x)-mouseX),dy=Math.abs(axisy.p2c(y)-mouseY),dist=dx*dx+dy*dy;if(dist<smallestDistance){smallestDistance=dist;item=[i,j/ps]}}}if(s.bars.show&&!item){var barLeft,barRight;switch(s.bars.align){case"left":barLeft=0;break;case"right":barLeft=-s.bars.barWidth;break;default:barLeft=-s.bars.barWidth/2}barRight=barLeft+s.bars.barWidth;for(j=0;j<points.length;j+=ps){var x=points[j],y=points[j+1],b=points[j+2];if(x==null)continue;if(series[i].bars.horizontal?mx<=Math.max(b,x)&&mx>=Math.min(b,x)&&my>=y+barLeft&&my<=y+barRight:mx>=x+barLeft&&mx<=x+barRight&&my>=Math.min(b,y)&&my<=Math.max(b,y))item=[i,j/ps]}}}if(item){i=item[0];j=item[1];ps=series[i].datapoints.pointsize;return{datapoint:series[i].datapoints.points.slice(j*ps,(j+1)*ps),dataIndex:j,series:series[i],seriesIndex:i}}return null}function onMouseMove(e){if(options.grid.hoverable)triggerClickHoverEvent("plothover",e,function(s){return s["hoverable"]!=false})}function onMouseLeave(e){if(options.grid.hoverable)triggerClickHoverEvent("plothover",e,function(s){return false})}function onClick(e){triggerClickHoverEvent("plotclick",e,function(s){return s["clickable"]!=false})}function triggerClickHoverEvent(eventname,event,seriesFilter){var offset=eventHolder.offset(),canvasX=event.pageX-offset.left-plotOffset.left,canvasY=event.pageY-offset.top-plotOffset.top,pos=canvasToAxisCoords({left:canvasX,top:canvasY});pos.pageX=event.pageX;pos.pageY=event.pageY;var item=findNearbyItem(canvasX,canvasY,seriesFilter);if(item){item.pageX=parseInt(item.series.xaxis.p2c(item.datapoint[0])+offset.left+plotOffset.left,10);item.pageY=parseInt(item.series.yaxis.p2c(item.datapoint[1])+offset.top+plotOffset.top,10)}if(options.grid.autoHighlight){for(var i=0;i<highlights.length;++i){var h=highlights[i];if(h.auto==eventname&&!(item&&h.series==item.series&&h.point[0]==item.datapoint[0]&&h.point[1]==item.datapoint[1]))unhighlight(h.series,h.point)}if(item)highlight(item.series,item.datapoint,eventname)}placeholder.trigger(eventname,[pos,item])}function triggerRedrawOverlay(){var t=options.interaction.redrawOverlayInterval;if(t==-1){drawOverlay();return}if(!redrawTimeout)redrawTimeout=setTimeout(drawOverlay,t)}function drawOverlay(){redrawTimeout=null;octx.save();overlay.clear();octx.translate(plotOffset.left,plotOffset.top);var i,hi;for(i=0;i<highlights.length;++i){hi=highlights[i];if(hi.series.bars.show)drawBarHighlight(hi.series,hi.point);else drawPointHighlight(hi.series,hi.point)}octx.restore();executeHooks(hooks.drawOverlay,[octx])}function highlight(s,point,auto){if(typeof s=="number")s=series[s];if(typeof point=="number"){var ps=s.datapoints.pointsize;point=s.datapoints.points.slice(ps*point,ps*(point+1))}var i=indexOfHighlight(s,point);if(i==-1){highlights.push({series:s,point:point,auto:auto});triggerRedrawOverlay()}else if(!auto)highlights[i].auto=false}function unhighlight(s,point){if(s==null&&point==null){highlights=[];triggerRedrawOverlay();return}if(typeof s=="number")s=series[s];if(typeof point=="number"){var ps=s.datapoints.pointsize;point=s.datapoints.points.slice(ps*point,ps*(point+1))}var i=indexOfHighlight(s,point);if(i!=-1){highlights.splice(i,1);triggerRedrawOverlay()}}function indexOfHighlight(s,p){for(var i=0;i<highlights.length;++i){var h=highlights[i];if(h.series==s&&h.point[0]==p[0]&&h.point[1]==p[1])return i}return-1}function drawPointHighlight(series,point){var x=point[0],y=point[1],axisx=series.xaxis,axisy=series.yaxis,highlightColor=typeof series.highlightColor==="string"?series.highlightColor:$.color.parse(series.color).scale("a",.5).toString();if(x<axisx.min||x>axisx.max||y<axisy.min||y>axisy.max)return;var pointRadius=series.points.radius+series.points.lineWidth/2;octx.lineWidth=pointRadius;octx.strokeStyle=highlightColor;var radius=1.5*pointRadius;x=axisx.p2c(x);y=axisy.p2c(y);octx.beginPath();if(series.points.symbol=="circle")octx.arc(x,y,radius,0,2*Math.PI,false);else series.points.symbol(octx,x,y,radius,false);octx.closePath();octx.stroke()}function drawBarHighlight(series,point){var highlightColor=typeof series.highlightColor==="string"?series.highlightColor:$.color.parse(series.color).scale("a",.5).toString(),fillStyle=highlightColor,barLeft;switch(series.bars.align){case"left":barLeft=0;break;case"right":barLeft=-series.bars.barWidth;break;default:barLeft=-series.bars.barWidth/2}octx.lineWidth=series.bars.lineWidth;octx.strokeStyle=highlightColor;drawBar(point[0],point[1],point[2]||0,barLeft,barLeft+series.bars.barWidth,function(){return fillStyle},series.xaxis,series.yaxis,octx,series.bars.horizontal,series.bars.lineWidth)}function getColorOrGradient(spec,bottom,top,defaultColor){if(typeof spec=="string")return spec;else{var gradient=ctx.createLinearGradient(0,top,0,bottom);for(var i=0,l=spec.colors.length;i<l;++i){var c=spec.colors[i];if(typeof c!="string"){var co=$.color.parse(defaultColor);if(c.brightness!=null)co=co.scale("rgb",c.brightness);if(c.opacity!=null)co.a*=c.opacity;c=co.toString()}gradient.addColorStop(i/(l-1),c)}return gradient}}}$.plot=function(placeholder,data,options){var plot=new Plot($(placeholder),data,options,$.plot.plugins);return plot};$.plot.version="0.8.3";$.plot.plugins=[];$.fn.plot=function(data,options){return this.each(function(){$.plot(this,data,options)})};function floorInBase(n,base){return base*Math.floor(n/base)}})(jQuery);
22+ </script>
23+ <script language="javascript" type="text/javascript">
24+ /* Javascript plotting library for jQuery, version 0.8.3.
25+
26+Copyright (c) 2007-2014 IOLA and Ole Laursen.
27+Licensed under the MIT license.
28+
29+*/
30+(function($){var options={series:{points:{errorbars:null,xerr:{err:"x",show:null,asymmetric:null,upperCap:null,lowerCap:null,color:null,radius:null},yerr:{err:"y",show:null,asymmetric:null,upperCap:null,lowerCap:null,color:null,radius:null}}}};function processRawData(plot,series,data,datapoints){if(!series.points.errorbars)return;var format=[{x:true,number:true,required:true},{y:true,number:true,required:true}];var errors=series.points.errorbars;if(errors=="x"||errors=="xy"){if(series.points.xerr.asymmetric){format.push({x:true,number:true,required:true});format.push({x:true,number:true,required:true})}else format.push({x:true,number:true,required:true})}if(errors=="y"||errors=="xy"){if(series.points.yerr.asymmetric){format.push({y:true,number:true,required:true});format.push({y:true,number:true,required:true})}else format.push({y:true,number:true,required:true})}datapoints.format=format}function parseErrors(series,i){var points=series.datapoints.points;var exl=null,exu=null,eyl=null,eyu=null;var xerr=series.points.xerr,yerr=series.points.yerr;var eb=series.points.errorbars;if(eb=="x"||eb=="xy"){if(xerr.asymmetric){exl=points[i+2];exu=points[i+3];if(eb=="xy")if(yerr.asymmetric){eyl=points[i+4];eyu=points[i+5]}else eyl=points[i+4]}else{exl=points[i+2];if(eb=="xy")if(yerr.asymmetric){eyl=points[i+3];eyu=points[i+4]}else eyl=points[i+3]}}else if(eb=="y")if(yerr.asymmetric){eyl=points[i+2];eyu=points[i+3]}else eyl=points[i+2];if(exu==null)exu=exl;if(eyu==null)eyu=eyl;var errRanges=[exl,exu,eyl,eyu];if(!xerr.show){errRanges[0]=null;errRanges[1]=null}if(!yerr.show){errRanges[2]=null;errRanges[3]=null}return errRanges}function drawSeriesErrors(plot,ctx,s){var points=s.datapoints.points,ps=s.datapoints.pointsize,ax=[s.xaxis,s.yaxis],radius=s.points.radius,err=[s.points.xerr,s.points.yerr];var invertX=false;if(ax[0].p2c(ax[0].max)<ax[0].p2c(ax[0].min)){invertX=true;var tmp=err[0].lowerCap;err[0].lowerCap=err[0].upperCap;err[0].upperCap=tmp}var 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147+})(jQuery);
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171+ margin: 40px 0 0;
172+ color: white;
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222+th {
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225+}
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227+th.cibound {
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229+}
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231+.confinterval {
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235+h1 {
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258+ </style>
259+ <![endif]-->
260+ </head>
261+ <body>
262+ <div id="wrap">
263+ <div id="main" class="body">
264+ <h1>criterion performance measurements</h1>
265+
266+<h2>overview</h2>
267+
268+<p><a href="#grokularation">want to understand this report?</a></p>
269+
270+<p>Environment: AMD Opteron 6168 on Ubuntu 12.04 with GHC 8.0.2</p>
271+
272+<div id="overview" class="ovchart" style="width:900px;height:100px;"></div>
273+
274+<h2><a name="b0">create/relation 10x100</a></h2>
275+ <table width="100%">
276+ <tbody>
277+ <tr>
278+ <td><div id="kde0" class="kdechart"
279+ style="width:450px;height:278px;"></div></td>
280+ <td><div id="time0" class="timechart"
281+ style="width:450px;height:278px;"></div></td>
282+<!--
283+ <td><div id="cycle0" class="cyclechart"
284+ style="width:300px;height:278px;"></div></td>
285+-->
286+ </tr>
287+ </tbody>
288+ </table>
289+
290+ <table>
291+ <thead class="analysis">
292+ <th></th>
293+ <th class="cibound"
294+ title="0.95 confidence level">lower bound</th>
295+ <th>estimate</th>
296+ <th class="cibound"
297+ title="0.95 confidence level">upper bound</th>
298+ </thead>
299+ <tbody>
300+ <tr>
301+ <td>OLS regression</td>
302+ <td><span class="confinterval olstimelb0">xxx</span></td>
303+ <td><span class="olstimept0">xxx</span></td>
304+ <td><span class="confinterval olstimeub0">xxx</span></td>
305+ </tr>
306+ <tr>
307+ <td>R&#xb2; goodness-of-fit</td>
308+ <td><span class="confinterval olsr2lb0">xxx</span></td>
309+ <td><span class="olsr2pt0">xxx</span></td>
310+ <td><span class="confinterval olsr2ub0">xxx</span></td>
311+ </tr>
312+ <tr>
313+ <td>Mean execution time</td>
314+ <td><span class="confinterval citime">5.891481267739451e-4</span></td>
315+ <td><span class="time">5.906283388143756e-4</span></td>
316+ <td><span class="confinterval citime">5.919056866982677e-4</span></td>
317+ </tr>
318+ <tr>
319+ <td>Standard deviation</td>
320+ <td><span class="confinterval citime">3.7867077713250133e-6</span></td>
321+ <td><span class="time">4.502571301832575e-6</span></td>
322+ <td><span class="confinterval citime">5.8062391798041006e-6</span></td>
323+ </tr>
324+ </tbody>
325+ </table>
326+
327+ <span class="outliers">
328+ <p>Outlying measurements have slight
329+ (<span class="percent">1.2343749999999981e-2</span>%)
330+ effect on estimated standard deviation.</p>
331+ </span>
332+<h2><a name="b1">create/relation 10x1000</a></h2>
333+ <table width="100%">
334+ <tbody>
335+ <tr>
336+ <td><div id="kde1" class="kdechart"
337+ style="width:450px;height:278px;"></div></td>
338+ <td><div id="time1" class="timechart"
339+ style="width:450px;height:278px;"></div></td>
340+<!--
341+ <td><div id="cycle1" class="cyclechart"
342+ style="width:300px;height:278px;"></div></td>
343+-->
344+ </tr>
345+ </tbody>
346+ </table>
347+
348+ <table>
349+ <thead class="analysis">
350+ <th></th>
351+ <th class="cibound"
352+ title="0.95 confidence level">lower bound</th>
353+ <th>estimate</th>
354+ <th class="cibound"
355+ title="0.95 confidence level">upper bound</th>
356+ </thead>
357+ <tbody>
358+ <tr>
359+ <td>OLS regression</td>
360+ <td><span class="confinterval olstimelb1">xxx</span></td>
361+ <td><span class="olstimept1">xxx</span></td>
362+ <td><span class="confinterval olstimeub1">xxx</span></td>
363+ </tr>
364+ <tr>
365+ <td>R&#xb2; goodness-of-fit</td>
366+ <td><span class="confinterval olsr2lb1">xxx</span></td>
367+ <td><span class="olsr2pt1">xxx</span></td>
368+ <td><span class="confinterval olsr2ub1">xxx</span></td>
369+ </tr>
370+ <tr>
371+ <td>Mean execution time</td>
372+ <td><span class="confinterval citime">5.760191573102873e-3</span></td>
373+ <td><span class="time">5.770838309782314e-3</span></td>
374+ <td><span class="confinterval citime">5.779948952798578e-3</span></td>
375+ </tr>
376+ <tr>
377+ <td>Standard deviation</td>
378+ <td><span class="confinterval citime">2.2935863601065537e-5</span></td>
379+ <td><span class="time">2.8815215559732134e-5</span></td>
380+ <td><span class="confinterval citime">3.914144050420156e-5</span></td>
381+ </tr>
382+ </tbody>
383+ </table>
384+
385+ <span class="outliers">
386+ <p>Outlying measurements have slight
387+ (<span class="percent">2.5623268698060614e-2</span>%)
388+ effect on estimated standard deviation.</p>
389+ </span>
390+<h2><a name="b2">create/relation 10x10000</a></h2>
391+ <table width="100%">
392+ <tbody>
393+ <tr>
394+ <td><div id="kde2" class="kdechart"
395+ style="width:450px;height:278px;"></div></td>
396+ <td><div id="time2" class="timechart"
397+ style="width:450px;height:278px;"></div></td>
398+<!--
399+ <td><div id="cycle2" class="cyclechart"
400+ style="width:300px;height:278px;"></div></td>
401+-->
402+ </tr>
403+ </tbody>
404+ </table>
405+
406+ <table>
407+ <thead class="analysis">
408+ <th></th>
409+ <th class="cibound"
410+ title="0.95 confidence level">lower bound</th>
411+ <th>estimate</th>
412+ <th class="cibound"
413+ title="0.95 confidence level">upper bound</th>
414+ </thead>
415+ <tbody>
416+ <tr>
417+ <td>OLS regression</td>
418+ <td><span class="confinterval olstimelb2">xxx</span></td>
419+ <td><span class="olstimept2">xxx</span></td>
420+ <td><span class="confinterval olstimeub2">xxx</span></td>
421+ </tr>
422+ <tr>
423+ <td>R&#xb2; goodness-of-fit</td>
424+ <td><span class="confinterval olsr2lb2">xxx</span></td>
425+ <td><span class="olsr2pt2">xxx</span></td>
426+ <td><span class="confinterval olsr2ub2">xxx</span></td>
427+ </tr>
428+ <tr>
429+ <td>Mean execution time</td>
430+ <td><span class="confinterval citime">5.772489494946795e-2</span></td>
431+ <td><span class="time">5.784195729887314e-2</span></td>
432+ <td><span class="confinterval citime">5.792298187695035e-2</span></td>
433+ </tr>
434+ <tr>
435+ <td>Standard deviation</td>
436+ <td><span class="confinterval citime">1.0422507194091924e-4</span></td>
437+ <td><span class="time">1.7121491767487851e-4</span></td>
438+ <td><span class="confinterval citime">2.73724491538287e-4</span></td>
439+ </tr>
440+ </tbody>
441+ </table>
442+
443+ <span class="outliers">
444+ <p>Outlying measurements have slight
445+ (<span class="percent">7.638888888888888e-2</span>%)
446+ effect on estimated standard deviation.</p>
447+ </span>
448+<h2><a name="b3">restrict/restrict relation 10x10000 to 10x1</a></h2>
449+ <table width="100%">
450+ <tbody>
451+ <tr>
452+ <td><div id="kde3" class="kdechart"
453+ style="width:450px;height:278px;"></div></td>
454+ <td><div id="time3" class="timechart"
455+ style="width:450px;height:278px;"></div></td>
456+<!--
457+ <td><div id="cycle3" class="cyclechart"
458+ style="width:300px;height:278px;"></div></td>
459+-->
460+ </tr>
461+ </tbody>
462+ </table>
463+
464+ <table>
465+ <thead class="analysis">
466+ <th></th>
467+ <th class="cibound"
468+ title="0.95 confidence level">lower bound</th>
469+ <th>estimate</th>
470+ <th class="cibound"
471+ title="0.95 confidence level">upper bound</th>
472+ </thead>
473+ <tbody>
474+ <tr>
475+ <td>OLS regression</td>
476+ <td><span class="confinterval olstimelb3">xxx</span></td>
477+ <td><span class="olstimept3">xxx</span></td>
478+ <td><span class="confinterval olstimeub3">xxx</span></td>
479+ </tr>
480+ <tr>
481+ <td>R&#xb2; goodness-of-fit</td>
482+ <td><span class="confinterval olsr2lb3">xxx</span></td>
483+ <td><span class="olsr2pt3">xxx</span></td>
484+ <td><span class="confinterval olsr2ub3">xxx</span></td>
485+ </tr>
486+ <tr>
487+ <td>Mean execution time</td>
488+ <td><span class="confinterval citime">1.4337830338577313e-2</span></td>
489+ <td><span class="time">1.448797309139284e-2</span></td>
490+ <td><span class="confinterval citime">1.4763601823824296e-2</span></td>
491+ </tr>
492+ <tr>
493+ <td>Standard deviation</td>
494+ <td><span class="confinterval citime">2.772536754203617e-4</span></td>
495+ <td><span class="time">4.774249175945004e-4</span></td>
496+ <td><span class="confinterval citime">8.291091461013828e-4</span></td>
497+ </tr>
498+ </tbody>
499+ </table>
500+
501+ <span class="outliers">
502+ <p>Outlying measurements have moderate
503+ (<span class="percent">0.11563227985262721</span>%)
504+ effect on estimated standard deviation.</p>
505+ </span>
506+<h2><a name="b4">restrict/restrict relation 10x10000 to 10x5000</a></h2>
507+ <table width="100%">
508+ <tbody>
509+ <tr>
510+ <td><div id="kde4" class="kdechart"
511+ style="width:450px;height:278px;"></div></td>
512+ <td><div id="time4" class="timechart"
513+ style="width:450px;height:278px;"></div></td>
514+<!--
515+ <td><div id="cycle4" class="cyclechart"
516+ style="width:300px;height:278px;"></div></td>
517+-->
518+ </tr>
519+ </tbody>
520+ </table>
521+
522+ <table>
523+ <thead class="analysis">
524+ <th></th>
525+ <th class="cibound"
526+ title="0.95 confidence level">lower bound</th>
527+ <th>estimate</th>
528+ <th class="cibound"
529+ title="0.95 confidence level">upper bound</th>
530+ </thead>
531+ <tbody>
532+ <tr>
533+ <td>OLS regression</td>
534+ <td><span class="confinterval olstimelb4">xxx</span></td>
535+ <td><span class="olstimept4">xxx</span></td>
536+ <td><span class="confinterval olstimeub4">xxx</span></td>
537+ </tr>
538+ <tr>
539+ <td>R&#xb2; goodness-of-fit</td>
540+ <td><span class="confinterval olsr2lb4">xxx</span></td>
541+ <td><span class="olsr2pt4">xxx</span></td>
542+ <td><span class="confinterval olsr2ub4">xxx</span></td>
543+ </tr>
544+ <tr>
545+ <td>Mean execution time</td>
546+ <td><span class="confinterval citime">8.322941573263729e-2</span></td>
547+ <td><span class="time">8.447258684075218e-2</span></td>
548+ <td><span class="confinterval citime">8.511386931168204e-2</span></td>
549+ </tr>
550+ <tr>
551+ <td>Standard deviation</td>
552+ <td><span class="confinterval citime">6.118316959029327e-4</span></td>
553+ <td><span class="time">1.4013810341920257e-3</span></td>
554+ <td><span class="confinterval citime">2.3016514403696887e-3</span></td>
555+ </tr>
556+ </tbody>
557+ </table>
558+
559+ <span class="outliers">
560+ <p>Outlying measurements have slight
561+ (<span class="percent">9.0e-2</span>%)
562+ effect on estimated standard deviation.</p>
563+ </span>
564+<h2><a name="b5">project/project 10x1000 to 1x1000</a></h2>
565+ <table width="100%">
566+ <tbody>
567+ <tr>
568+ <td><div id="kde5" class="kdechart"
569+ style="width:450px;height:278px;"></div></td>
570+ <td><div id="time5" class="timechart"
571+ style="width:450px;height:278px;"></div></td>
572+<!--
573+ <td><div id="cycle5" class="cyclechart"
574+ style="width:300px;height:278px;"></div></td>
575+-->
576+ </tr>
577+ </tbody>
578+ </table>
579+
580+ <table>
581+ <thead class="analysis">
582+ <th></th>
583+ <th class="cibound"
584+ title="0.95 confidence level">lower bound</th>
585+ <th>estimate</th>
586+ <th class="cibound"
587+ title="0.95 confidence level">upper bound</th>
588+ </thead>
589+ <tbody>
590+ <tr>
591+ <td>OLS regression</td>
592+ <td><span class="confinterval olstimelb5">xxx</span></td>
593+ <td><span class="olstimept5">xxx</span></td>
594+ <td><span class="confinterval olstimeub5">xxx</span></td>
595+ </tr>
596+ <tr>
597+ <td>R&#xb2; goodness-of-fit</td>
598+ <td><span class="confinterval olsr2lb5">xxx</span></td>
599+ <td><span class="olsr2pt5">xxx</span></td>
600+ <td><span class="confinterval olsr2ub5">xxx</span></td>
601+ </tr>
602+ <tr>
603+ <td>Mean execution time</td>
604+ <td><span class="confinterval citime">1.2211661066456561e-2</span></td>
605+ <td><span class="time">1.243577405705988e-2</span></td>
606+ <td><span class="confinterval citime">1.2583044006972743e-2</span></td>
607+ </tr>
608+ <tr>
609+ <td>Standard deviation</td>
610+ <td><span class="confinterval citime">3.0211460384957275e-4</span></td>
611+ <td><span class="time">4.600204612133745e-4</span></td>
612+ <td><span class="confinterval citime">5.956804020691042e-4</span></td>
613+ </tr>
614+ </tbody>
615+ </table>
616+
617+ <span class="outliers">
618+ <p>Outlying measurements have moderate
619+ (<span class="percent">0.14345146934193906</span>%)
620+ effect on estimated standard deviation.</p>
621+ </span>
622+<h2><a name="b6">project/project 10x1000 to 5x1000</a></h2>
623+ <table width="100%">
624+ <tbody>
625+ <tr>
626+ <td><div id="kde6" class="kdechart"
627+ style="width:450px;height:278px;"></div></td>
628+ <td><div id="time6" class="timechart"
629+ style="width:450px;height:278px;"></div></td>
630+<!--
631+ <td><div id="cycle6" class="cyclechart"
632+ style="width:300px;height:278px;"></div></td>
633+-->
634+ </tr>
635+ </tbody>
636+ </table>
637+
638+ <table>
639+ <thead class="analysis">
640+ <th></th>
641+ <th class="cibound"
642+ title="0.95 confidence level">lower bound</th>
643+ <th>estimate</th>
644+ <th class="cibound"
645+ title="0.95 confidence level">upper bound</th>
646+ </thead>
647+ <tbody>
648+ <tr>
649+ <td>OLS regression</td>
650+ <td><span class="confinterval olstimelb6">xxx</span></td>
651+ <td><span class="olstimept6">xxx</span></td>
652+ <td><span class="confinterval olstimeub6">xxx</span></td>
653+ </tr>
654+ <tr>
655+ <td>R&#xb2; goodness-of-fit</td>
656+ <td><span class="confinterval olsr2lb6">xxx</span></td>
657+ <td><span class="olsr2pt6">xxx</span></td>
658+ <td><span class="confinterval olsr2ub6">xxx</span></td>
659+ </tr>
660+ <tr>
661+ <td>Mean execution time</td>
662+ <td><span class="confinterval citime">1.5271674270594341e-2</span></td>
663+ <td><span class="time">1.547382196820991e-2</span></td>
664+ <td><span class="confinterval citime">1.5622307025724294e-2</span></td>
665+ </tr>
666+ <tr>
667+ <td>Standard deviation</td>
668+ <td><span class="confinterval citime">2.873217405621163e-4</span></td>
669+ <td><span class="time">3.978143402171812e-4</span></td>
670+ <td><span class="confinterval citime">5.247713511789067e-4</span></td>
671+ </tr>
672+ </tbody>
673+ </table>
674+
675+ <span class="outliers">
676+ <p>Outlying measurements have slight
677+ (<span class="percent">4.1587901701323225e-2</span>%)
678+ effect on estimated standard deviation.</p>
679+ </span>
680+<h2><a name="b7">union/union identical 10x1000</a></h2>
681+ <table width="100%">
682+ <tbody>
683+ <tr>
684+ <td><div id="kde7" class="kdechart"
685+ style="width:450px;height:278px;"></div></td>
686+ <td><div id="time7" class="timechart"
687+ style="width:450px;height:278px;"></div></td>
688+<!--
689+ <td><div id="cycle7" class="cyclechart"
690+ style="width:300px;height:278px;"></div></td>
691+-->
692+ </tr>
693+ </tbody>
694+ </table>
695+
696+ <table>
697+ <thead class="analysis">
698+ <th></th>
699+ <th class="cibound"
700+ title="0.95 confidence level">lower bound</th>
701+ <th>estimate</th>
702+ <th class="cibound"
703+ title="0.95 confidence level">upper bound</th>
704+ </thead>
705+ <tbody>
706+ <tr>
707+ <td>OLS regression</td>
708+ <td><span class="confinterval olstimelb7">xxx</span></td>
709+ <td><span class="olstimept7">xxx</span></td>
710+ <td><span class="confinterval olstimeub7">xxx</span></td>
711+ </tr>
712+ <tr>
713+ <td>R&#xb2; goodness-of-fit</td>
714+ <td><span class="confinterval olsr2lb7">xxx</span></td>
715+ <td><span class="olsr2pt7">xxx</span></td>
716+ <td><span class="confinterval olsr2ub7">xxx</span></td>
717+ </tr>
718+ <tr>
719+ <td>Mean execution time</td>
720+ <td><span class="confinterval citime">4.908323998442862e-2</span></td>
721+ <td><span class="time">4.923173514046889e-2</span></td>
722+ <td><span class="confinterval citime">4.94547578201357e-2</span></td>
723+ </tr>
724+ <tr>
725+ <td>Standard deviation</td>
726+ <td><span class="confinterval citime">2.09615306506087e-4</span></td>
727+ <td><span class="time">3.275115670368287e-4</span></td>
728+ <td><span class="confinterval citime">4.977889379852797e-4</span></td>
729+ </tr>
730+ </tbody>
731+ </table>
732+
733+ <span class="outliers">
734+ <p>Outlying measurements have slight
735+ (<span class="percent">7.100591715976319e-2</span>%)
736+ effect on estimated standard deviation.</p>
737+ </span>
738+<h2><a name="b8">union/union identical 10x10000</a></h2>
739+ <table width="100%">
740+ <tbody>
741+ <tr>
742+ <td><div id="kde8" class="kdechart"
743+ style="width:450px;height:278px;"></div></td>
744+ <td><div id="time8" class="timechart"
745+ style="width:450px;height:278px;"></div></td>
746+<!--
747+ <td><div id="cycle8" class="cyclechart"
748+ style="width:300px;height:278px;"></div></td>
749+-->
750+ </tr>
751+ </tbody>
752+ </table>
753+
754+ <table>
755+ <thead class="analysis">
756+ <th></th>
757+ <th class="cibound"
758+ title="0.95 confidence level">lower bound</th>
759+ <th>estimate</th>
760+ <th class="cibound"
761+ title="0.95 confidence level">upper bound</th>
762+ </thead>
763+ <tbody>
764+ <tr>
765+ <td>OLS regression</td>
766+ <td><span class="confinterval olstimelb8">xxx</span></td>
767+ <td><span class="olstimept8">xxx</span></td>
768+ <td><span class="confinterval olstimeub8">xxx</span></td>
769+ </tr>
770+ <tr>
771+ <td>R&#xb2; goodness-of-fit</td>
772+ <td><span class="confinterval olsr2lb8">xxx</span></td>
773+ <td><span class="olsr2pt8">xxx</span></td>
774+ <td><span class="confinterval olsr2ub8">xxx</span></td>
775+ </tr>
776+ <tr>
777+ <td>Mean execution time</td>
778+ <td><span class="confinterval citime">0.5144192261126985</span></td>
779+ <td><span class="time">0.5157808375258943</span></td>
780+ <td><span class="confinterval citime">0.5164000385072457</span></td>
781+ </tr>
782+ <tr>
783+ <td>Standard deviation</td>
784+ <td><span class="confinterval citime">0</span></td>
785+ <td><span class="time">1.1935851498586624e-3</span></td>
786+ <td><span class="confinterval citime">1.285892588023751e-3</span></td>
787+ </tr>
788+ </tbody>
789+ </table>
790+
791+ <span class="outliers">
792+ <p>Outlying measurements have moderate
793+ (<span class="percent">0.18749999999999997</span>%)
794+ effect on estimated standard deviation.</p>
795+ </span>
796+<h2><a name="b9">join/join identical 10x100</a></h2>
797+ <table width="100%">
798+ <tbody>
799+ <tr>
800+ <td><div id="kde9" class="kdechart"
801+ style="width:450px;height:278px;"></div></td>
802+ <td><div id="time9" class="timechart"
803+ style="width:450px;height:278px;"></div></td>
804+<!--
805+ <td><div id="cycle9" class="cyclechart"
806+ style="width:300px;height:278px;"></div></td>
807+-->
808+ </tr>
809+ </tbody>
810+ </table>
811+
812+ <table>
813+ <thead class="analysis">
814+ <th></th>
815+ <th class="cibound"
816+ title="0.95 confidence level">lower bound</th>
817+ <th>estimate</th>
818+ <th class="cibound"
819+ title="0.95 confidence level">upper bound</th>
820+ </thead>
821+ <tbody>
822+ <tr>
823+ <td>OLS regression</td>
824+ <td><span class="confinterval olstimelb9">xxx</span></td>
825+ <td><span class="olstimept9">xxx</span></td>
826+ <td><span class="confinterval olstimeub9">xxx</span></td>
827+ </tr>
828+ <tr>
829+ <td>R&#xb2; goodness-of-fit</td>
830+ <td><span class="confinterval olsr2lb9">xxx</span></td>
831+ <td><span class="olsr2pt9">xxx</span></td>
832+ <td><span class="confinterval olsr2ub9">xxx</span></td>
833+ </tr>
834+ <tr>
835+ <td>Mean execution time</td>
836+ <td><span class="confinterval citime">0.3355841931137941</span></td>
837+ <td><span class="time">0.3374978199984254</span></td>
838+ <td><span class="confinterval citime">0.3385756312293291</span></td>
839+ </tr>
840+ <tr>
841+ <td>Standard deviation</td>
842+ <td><span class="confinterval citime">0</span></td>
843+ <td><span class="time">1.6965376723717264e-3</span></td>
844+ <td><span class="confinterval citime">1.8668238128934738e-3</span></td>
845+ </tr>
846+ </tbody>
847+ </table>
848+
849+ <span class="outliers">
850+ <p>Outlying measurements have moderate
851+ (<span class="percent">0.1875</span>%)
852+ effect on estimated standard deviation.</p>
853+ </span>
854+<h2><a name="b10">group/group 10x100</a></h2>
855+ <table width="100%">
856+ <tbody>
857+ <tr>
858+ <td><div id="kde10" class="kdechart"
859+ style="width:450px;height:278px;"></div></td>
860+ <td><div id="time10" class="timechart"
861+ style="width:450px;height:278px;"></div></td>
862+<!--
863+ <td><div id="cycle10" class="cyclechart"
864+ style="width:300px;height:278px;"></div></td>
865+-->
866+ </tr>
867+ </tbody>
868+ </table>
869+
870+ <table>
871+ <thead class="analysis">
872+ <th></th>
873+ <th class="cibound"
874+ title="0.95 confidence level">lower bound</th>
875+ <th>estimate</th>
876+ <th class="cibound"
877+ title="0.95 confidence level">upper bound</th>
878+ </thead>
879+ <tbody>
880+ <tr>
881+ <td>OLS regression</td>
882+ <td><span class="confinterval olstimelb10">xxx</span></td>
883+ <td><span class="olstimept10">xxx</span></td>
884+ <td><span class="confinterval olstimeub10">xxx</span></td>
885+ </tr>
886+ <tr>
887+ <td>R&#xb2; goodness-of-fit</td>
888+ <td><span class="confinterval olsr2lb10">xxx</span></td>
889+ <td><span class="olsr2pt10">xxx</span></td>
890+ <td><span class="confinterval olsr2ub10">xxx</span></td>
891+ </tr>
892+ <tr>
893+ <td>Mean execution time</td>
894+ <td><span class="confinterval citime">4.666001885635249e-2</span></td>
895+ <td><span class="time">4.70336206675725e-2</span></td>
896+ <td><span class="confinterval citime">4.7476184359486216e-2</span></td>
897+ </tr>
898+ <tr>
899+ <td>Standard deviation</td>
900+ <td><span class="confinterval citime">5.178696454087703e-4</span></td>
901+ <td><span class="time">7.389605929837668e-4</span></td>
902+ <td><span class="confinterval citime">1.1404867684675546e-3</span></td>
903+ </tr>
904+ </tbody>
905+ </table>
906+
907+ <span class="outliers">
908+ <p>Outlying measurements have slight
909+ (<span class="percent">7.100591715976322e-2</span>%)
910+ effect on estimated standard deviation.</p>
911+ </span>
912+<h2><a name="b11">write/write 10x1000</a></h2>
913+ <table width="100%">
914+ <tbody>
915+ <tr>
916+ <td><div id="kde11" class="kdechart"
917+ style="width:450px;height:278px;"></div></td>
918+ <td><div id="time11" class="timechart"
919+ style="width:450px;height:278px;"></div></td>
920+<!--
921+ <td><div id="cycle11" class="cyclechart"
922+ style="width:300px;height:278px;"></div></td>
923+-->
924+ </tr>
925+ </tbody>
926+ </table>
927+
928+ <table>
929+ <thead class="analysis">
930+ <th></th>
931+ <th class="cibound"
932+ title="0.95 confidence level">lower bound</th>
933+ <th>estimate</th>
934+ <th class="cibound"
935+ title="0.95 confidence level">upper bound</th>
936+ </thead>
937+ <tbody>
938+ <tr>
939+ <td>OLS regression</td>
940+ <td><span class="confinterval olstimelb11">xxx</span></td>
941+ <td><span class="olstimept11">xxx</span></td>
942+ <td><span class="confinterval olstimeub11">xxx</span></td>
943+ </tr>
944+ <tr>
945+ <td>R&#xb2; goodness-of-fit</td>
946+ <td><span class="confinterval olsr2lb11">xxx</span></td>
947+ <td><span class="olsr2pt11">xxx</span></td>
948+ <td><span class="confinterval olsr2ub11">xxx</span></td>
949+ </tr>
950+ <tr>
951+ <td>Mean execution time</td>
952+ <td><span class="confinterval citime">1.5472953190097016e-3</span></td>
953+ <td><span class="time">1.5673276303702817e-3</span></td>
954+ <td><span class="confinterval citime">1.5890440248897237e-3</span></td>
955+ </tr>
956+ <tr>
957+ <td>Standard deviation</td>
958+ <td><span class="confinterval citime">6.110376965683773e-5</span></td>
959+ <td><span class="time">6.970009193368111e-5</span></td>
960+ <td><span class="confinterval citime">7.954403273020534e-5</span></td>
961+ </tr>
962+ </tbody>
963+ </table>
964+
965+ <span class="outliers">
966+ <p>Outlying measurements have moderate
967+ (<span class="percent">0.30346203307926556</span>%)
968+ effect on estimated standard deviation.</p>
969+ </span>
970+
971+ <h2><a name="grokularation">understanding this report</a></h2>
972+
973+ <p>In this report, each function benchmarked by criterion is assigned
974+ a section of its own. The charts in each section are active; if
975+ you hover your mouse over data points and annotations, you will see
976+ more details.</p>
977+
978+ <ul>
979+ <li>The chart on the left is a
980+ <a href="http://en.wikipedia.org/wiki/Kernel_density_estimation">kernel
981+ density estimate</a> (also known as a KDE) of time
982+ measurements. This graphs the probability of any given time
983+ measurement occurring. A spike indicates that a measurement of a
984+ particular time occurred; its height indicates how often that
985+ measurement was repeated.</li>
986+
987+ <li>The chart on the right is the raw data from which the kernel
988+ density estimate is built. The <i>x</i> axis indicates the
989+ number of loop iterations, while the <i>y</i> axis shows measured
990+ execution time for the given number of loop iterations. The
991+ line behind the values is the linear regression prediction of
992+ execution time for a given number of iterations. Ideally, all
993+ measurements will be on (or very near) this line.</li>
994+ </ul>
995+
996+ <p>Under the charts is a small table.
997+ The first two rows are the results of a linear regression run
998+ on the measurements displayed in the right-hand chart.</p>
999+
1000+ <ul>
1001+ <li><i>OLS regression</i> indicates the
1002+ time estimated for a single loop iteration using an ordinary
1003+ least-squares regression model. This number is more accurate
1004+ than the <i>mean</i> estimate below it, as it more effectively
1005+ eliminates measurement overhead and other constant factors.</li>
1006+ <li><i>R&#xb2; goodness-of-fit</i> is a measure of how
1007+ accurately the linear regression model fits the observed
1008+ measurements. If the measurements are not too noisy, R&#xb2;
1009+ should lie between 0.99 and 1, indicating an excellent fit. If
1010+ the number is below 0.99, something is confounding the accuracy
1011+ of the linear model.</li>
1012+ <li><i>Mean execution time</i> and <i>standard deviation</i> are
1013+ statistics calculated from execution time
1014+ divided by number of iterations.</li>
1015+ </ul>
1016+
1017+ <p>We use a statistical technique called
1018+ the <a href="http://en.wikipedia.org/wiki/Bootstrapping_(statistics)">bootstrap</a>
1019+ to provide confidence intervals on our estimates. The
1020+ bootstrap-derived upper and lower bounds on estimates let you see
1021+ how accurate we believe those estimates to be. (Hover the mouse
1022+ over the table headers to see the confidence levels.)</p>
1023+
1024+ <p>A noisy benchmarking environment can cause some or many
1025+ measurements to fall far from the mean. These outlying
1026+ measurements can have a significant inflationary effect on the
1027+ estimate of the standard deviation. We calculate and display an
1028+ estimate of the extent to which the standard deviation has been
1029+ inflated by outliers.</p>
1030+
1031+<script type="text/javascript">
1032+$(function () {
1033+ function mangulate(rpt) {
1034+ var measured = function(key) {
1035+ var idx = rpt.reportKeys.indexOf(key);
1036+ return rpt.reportMeasured.map(function(r) { return r[idx]; });
1037+ };
1038+ var lowerBound = function(est) {
1039+ return est.estPoint - est.estError.confIntLDX;
1040+ };
1041+ var upperBound = function(est) {
1042+ return est.estPoint + est.estError.confIntUDX;
1043+ };
1044+ var number = rpt.reportNumber;
1045+ var name = rpt.reportName;
1046+ var mean = rpt.reportAnalysis.anMean.estPoint;
1047+ var iters = measured("iters");
1048+ var times = measured("time");
1049+ var kdetimes = rpt.reportKDEs[0].kdeValues;
1050+ var kdepdf = rpt.reportKDEs[0].kdePDF;
1051+
1052+ var meanSecs = mean;
1053+ var units = $.timeUnits(mean);
1054+ var rgrs = rpt.reportAnalysis.anRegress[0];
1055+ var scale = units[0];
1056+ var olsTime = rgrs.regCoeffs.iters;
1057+ $(".olstimept" + number).text(function() {
1058+ return $.renderTime(olsTime.estPoint);
1059+ });
1060+ $(".olstimelb" + number).text(function() {
1061+ return $.renderTime(lowerBound(olsTime));
1062+ });
1063+ $(".olstimeub" + number).text(function() {
1064+ return $.renderTime(upperBound(olsTime));
1065+ });
1066+ $(".olsr2pt" + number).text(function() {
1067+ return rgrs.regRSquare.estPoint.toFixed(3);
1068+ });
1069+ $(".olsr2lb" + number).text(function() {
1070+ return lowerBound(rgrs.regRSquare).toFixed(3);
1071+ });
1072+ $(".olsr2ub" + number).text(function() {
1073+ return upperBound(rgrs.regRSquare).toFixed(3);
1074+ });
1075+ mean *= scale;
1076+ kdetimes = $.scaleBy(scale, kdetimes);
1077+ var kq = $("#kde" + number);
1078+ var k = $.plot(kq,
1079+ [{ label: name + " time densities",
1080+ data: $.zip(kdetimes, kdepdf),
1081+ }],
1082+ { xaxis: { tickFormatter: $.unitFormatter(scale) },
1083+ yaxis: { ticks: false },
1084+ grid: { borderColor: "#777",
1085+ hoverable: true, markings: [ { color: '#6fd3fb',
1086+ lineWidth: 1.5, xaxis: { from: mean, to: mean } } ] },
1087+ });
1088+ var o = k.pointOffset({ x: mean, y: 0});
1089+ kq.append('<div class="meanlegend" title="' + $.renderTime(meanSecs) +
1090+ '" style="position:absolute;left:' + (o.left + 4) +
1091+ 'px;bottom:139px;">mean</div>');
1092+ $.addTooltip("#kde" + number,
1093+ function(secs) { return $.renderTime(secs / scale); });
1094+ var timepairs = new Array(times.length);
1095+ var lastiter = iters[iters.length-1];
1096+ var olspairs = [[0,0], [lastiter, lastiter * scale * olsTime.estPoint]];
1097+ for (var i = 0; i < times.length; i++)
1098+ timepairs[i] = [iters[i],times[i]*scale];
1099+ iterFormatter = function() {
1100+ var denom = 0;
1101+ return function(iters) {
1102+ if (iters == 0)
1103+ return '';
1104+ if (denom > 0)
1105+ return (iters / denom).toFixed();
1106+ var power;
1107+ if (iters >= 1e9) {
1108+ denom = '1e9'; power = '&#x2079;';
1109+ }
1110+ if (iters >= 1e6) {
1111+ denom = '1e6'; power = '&#x2076;';
1112+ }
1113+ else if (iters >= 1e3) {
1114+ denom = '1e3'; power = '&#xb3;';
1115+ }
1116+ else denom = 1;
1117+ if (denom > 1) {
1118+ iters = (iters / denom).toFixed();
1119+ iters += '&times;10' + power + ' iters';
1120+ } else {
1121+ iters += ' iters';
1122+ }
1123+ return iters;
1124+ };
1125+ };
1126+ $.plot($("#time" + number),
1127+ [{ label: "regression", data: olspairs,
1128+ lines: { show: true } },
1129+ { label: name + " times", data: timepairs,
1130+ points: { show: true } }],
1131+ { grid: { borderColor: "#777", hoverable: true },
1132+ xaxis: { tickFormatter: iterFormatter() },
1133+ yaxis: { tickFormatter: $.unitFormatter(scale) } });
1134+ $.addTooltip("#time" + number,
1135+ function(iters,secs) {
1136+ return ($.renderTime(secs / scale) + ' / ' +
1137+ iters.toLocaleString() + ' iters');
1138+ });
1139+ if (0) {
1140+ var cyclepairs = new Array(cycles.length);
1141+ for (var i = 0; i < cycles.length; i++)
1142+ cyclepairs[i] = [cycles[i],i];
1143+ $.plot($("#cycle" + number),
1144+ [{ label: name + " cycles",
1145+ data: cyclepairs }],
1146+ { points: { show: true },
1147+ grid: { borderColor: "#777", hoverable: true },
1148+ xaxis: { tickFormatter:
1149+ function(cycles,axis) { return cycles + ' cycles'; }},
1150+ yaxis: { ticks: false },
1151+ });
1152+ $.addTooltip("#cycles" + number, function(x,y) { return x + ' cycles'; });
1153+ }
1154+ };
1155+ var reports = 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1156+ reports.map(mangulate);
1157+
1158+ var benches = ["create/relation 10x100","create/relation 10x1000","create/relation 10x10000","restrict/restrict relation 10x10000 to 10x1","restrict/restrict relation 10x10000 to 10x5000","project/project 10x1000 to 1x1000","project/project 10x1000 to 5x1000","union/union identical 10x1000","union/union identical 10x10000","join/join identical 10x100","group/group 10x100","write/write 10x1000",];
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1160+ var means = $.scaleTimes([5.906283388143756e-4,5.770838309782314e-3,5.784195729887314e-2,1.448797309139284e-2,8.447258684075218e-2,1.243577405705988e-2,1.547382196820991e-2,4.923173514046889e-2,0.5157808375258943,0.3374978199984254,4.70336206675725e-2,1.5673276303702817e-3,]);
1161+ var stddevs = [4.502571301832575e-6,2.8815215559732134e-5,1.7121491767487851e-4,4.774249175945004e-4,1.4013810341920257e-3,4.600204612133745e-4,3.978143402171812e-4,3.275115670368287e-4,1.1935851498586624e-3,1.6965376723717264e-3,7.389605929837668e-4,6.970009193368111e-5,];
1162+ stddevs = $.scaleBy(means[1], stddevs);
1163+ var xs = [];
1164+ var prev = null;
1165+ var colors = ["#edc240","#afd8f8","#cb4b4b","#4da74d","#9440ed"];
1166+ var max_time = 0;
1167+ for (var i = 0; i < means[0].length; i++) {
1168+ var name = benches[i].split(/\//);
1169+ name.pop();
1170+ name = name.join('/');
1171+ if (name != prev) {
1172+ var color = colors[xs.length / 2 % colors.length];
1173+ xs.push({ data: [[means[0][i], -i]], label: name, color: color,
1174+ bars: { show: true, horizontal: true, barWidth: 0.75,
1175+ align: "center" } });
1176+ xs.push({ data: [[means[0][i], -i, stddevs[i]]], color: color,
1177+ lines: { show: false },
1178+ points: { radius: 0, errorbars: "x",
1179+ xerr: { show: true, radius: 5,
1180+ lowerCap: "-", upperCap: "-" } } });
1181+ prev = name;
1182+ } else {
1183+ xs[xs.length - 2].data.push([means[0][i], -i]);
1184+ xs[xs.length - 1].data.push([means[0][i], -i, stddevs[i]]);
1185+ }
1186+ max_time = Math.max(max_time, means[0][i] + stddevs[i]);
1187+ }
1188+ var oq = $("#overview");
1189+ o = $.plot(oq, xs, { grid: { borderColor: "#777", hoverable: true },
1190+ legend: { show: xs.length > 1 },
1191+ xaxis: { max: max_time * 1.02 },
1192+ yaxis: { ticks: ylabels, tickColor: '#ffffff' },
1193+ zoom: { interactive: true, amount: 1.05 },
1194+ pan: { interactive: true } });
1195+ if (benches.length > 3)
1196+ o.getPlaceholder().height(28*benches.length);
1197+ o.resize();
1198+ o.setupGrid();
1199+ o.draw();
1200+ $.addTooltip("#overview", function(x,y) { return $.renderTime(x / means[1]); });
1201+});
1202+$(document).ready(function () {
1203+ $(".time").text(function(_, text) {
1204+ return $.renderTime(text);
1205+ });
1206+ $(".citime").text(function(_, text) {
1207+ return $.renderTime(text);
1208+ });
1209+ $(".percent").text(function(_, text) {
1210+ return (text*100).toFixed(1);
1211+ });
1212+ });
1213+</script>
1214+
1215+ </div>
1216+ </div>
1217+ <div id="footer">
1218+ <div class="body">
1219+ <div class="footfirst">
1220+ <h2>colophon</h2>
1221+ <p>This report was created using the
1222+ <a href="http://hackage.haskell.org/package/criterion">criterion</a>
1223+ benchmark execution and performance analysis tool.</p>
1224+ <p>Criterion is developed and maintained
1225+ by <a href="http://www.serpentine.com/blog/">Bryan O'Sullivan</a>.</p>
1226+ </div>
1227+ </div>
1228+ </div>
1229+ </body>
1230+</html>
docs/commits_in_constant_time.markdownnew file+134
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1+# Transactional Database Commits in O(1)
2+
3+A.M.
4+
5+[Project:M36](https://github.com/agentm/project-m36)
6+
7+## Synopsis
8+
9+Common relational database management systems operate in an imperative manner by executing statements immediately. This naive strategy quickly becomes an IO-bound bottleneck. By applying Haskell's laziness-in-evaluation to database updates, new doors for optimizations based on what is queried make themselves apparent. Furthermore, by serializing thunks representing idempotent database updates, the database can commit transactions in constant time with regards to the tuple count since the tuples themselves need not be serialized. This optimization, combined with *fsync*-coalescing, can allow databases to commit to disk faster than tuples updates can be processed.
10+
11+Using this deferred execution technique, database updates can be processed in the background or, in the case when the tuples are never requested, never.
12+
13+These database update thunks and other interesting optimizations are implemented in [Project:M36](https://github.com/agentm/project-m36): an experimental, clean-room, purely Haskell implementation of an RDBMS engine based on the mathematical principles of the relational algebra.
14+
15+## Rationale
16+
17+A typical SQL RDBMS such as PostgreSQL executes a list of commands serially against a serializable representation of the database state without concern to whether or not the commands are effectively necessary to service subsequent requests. A database update which affects *n* tuples will necessitate disk writes of *O(n)* plus *O(n\*log(n))* writes for each affected index.
18+
19+By validating and serializing thunks of validated commands, Project:M36 commits can be independent of the tuple write cost. The thunks, which are flushed to non-volatile storage to complete the transaction commit, allow the DBMS to defer execution in preference to commit time.
20+
21+The deferral is, however, not required, and could be left as a option to the user or application.
22+
23+The final cost of committing in Project:M36 relates to the size of the update expression. If the update expression is, for example, a insertion of a large number of rows, then the commit cost will be *O(t)* where *t* is the number of tuples expressed in the update, but still independent of the cost of the existing tuples in the database.
24+
25+## Example and Comparison to PostgreSQL
26+
27+Let us walk through a specific example using SQL. While Project:M36 does not support SQL (and for [good reasons](https://github.com/agentm/project-m36/blob/master/docs/on_null.markdown)), comparing both databases with a common language is useful for illustrative purposes.
28+
29+Let us consider an existing database with a table/relation named "BigTable" which has 10 billion rows/tuples (an arbitrarily large number) of which one column is named "x" and represents a randomly-assigned integer. Next, assume that the user of the database will execute an update which will update every row/tuple, commit the changes, then query a subset of the resultant updated rows/tuples.
30+
31+
32+### The Update Expression
33+
34+Consider the following database update:
35+
36+```
37+UPDATE "BigTable" SET x = x + 1;
38+```
39+In PostgreSQL, the cost of executing this expression is incurred immediately upon execution. New tuples are laid down to disk (if the dataset is larger than *shared_buffers*), duplicating the entirety of the existing table/relation in storage (due to MVCC) for a cost of *O(n)* where *n* is the number of existing rows/tuples in "BigTable". If *x* is indexed, then the index writes incur an additional cost of *O(n\*log(n))* writes. Furthermore, PostgreSQL will write all changes to its write-ahead log, so the cost is multiplied by some factor.
40+
41+In Project:M36, the same expression can first be statically validated to adhere to the database constraints. The only constraint affected here is for the column/attribute *x* which requires an integer. Since adding one to any integer retains the integer type, the constraint can be determined to be unviolated without evaluating the expression, thus at a cost of *O(1)*. Project:M36 uses a novel WORM (write-once, read-many) strategy over journaled filesystems to avoid the need for a separate journal.
42+
43+*For the purpose of this example, assume that integer overflow is not a concern.*
44+
45+### The Commit
46+
47+```
48+COMMIT;
49+```
50+
51+In PostgreSQL, the write-ahead log mentioned above containing all tuples changes must now be flushed to non-volatile storage, creating a bottleneck to the slowest form of storage. A necessary checkpoint (which is configurable) could incur further writes as the tuples are flushed to disk as well.
52+
53+In Project:M36, the update expression must also be flushed to disk, but the expression is a mere few bytes appended to the transaction graph.
54+
55+### The Subsequent Query
56+
57+Finally, the user queries a subset of the updated table/relation.
58+
59+```
60+SELECT a, b, c, x FROM "BigTable" WHERE x > 10000;
61+```
62+
63+In PostgreSQL, considering that the column/attribute has an index, *O(log(n))* reads are needed to identify on which pages in the table's on-disk storage the proper values can be found. Considering that the value *x* was previously described as random, despite the restriction, in the worst case, every page of the on-disk table may need to be read because each page could contain one value matching the restriction. This would necessitate reading *O(n)* tuples previously written to disk. After reading the tuples, the tuples must be filtered by the restriction to service the query.
64+
65+In Project:M36, the state of the database is determined to be the difference of the previous state *S* (before the *x+1* update above) and *S'* (after the update). The serialized update expression can be deserialized and merged into the rewritten query:
66+
67+```
68+SELECT orig.a, orig.b, orig.c, x_orig + 1 AS x FROM (SELECT a, b, c, x AS x_orig FROM "BigTable"@S) AS orig WHERE x > 10000;
69+```
70+
71+where the *@* symbol references the state of "BigTable" at transaction state *S* in the past. The rewrite process can occur in constant time regarding the tuple count, but the execution does require reading the previous state *S* of "BigTable", filtering it as expected. The tuple read cost is equivalent to that of the same statement at *S'*: *O(log(n))* utilizing a b-tree index.
72+
73+### Summary
74+
75+| | PostgreSQL | Project:M36 |
76+|-|------------|-------------|
77+| UPDATE x+1 | *O(nlog(n))* | *O(1)* |
78+| COMMIT | flush *n* tuples to disk | flush expression to disk |
79+| SELECT x>10000 | *Ω(log(n))*, *O(n)* worst case | *O(log(n))* |
80+
81+Even if the user were to query all the tuples back, the actual IO cost in Project:M36 would be lower since the updates are only "executed" on the fly and not necessarily written to disk. However, a clever cacheing strategy could note that state *S* is queried often enough to warrant a cached version. The table's data on disk, however, is not required to answer the query.
82+
83+## Constraint Oracles
84+
85+To be able to perform an update and commit in constant or less than *O(n)* time does have some preconditions:
86+
87+ * constraints must be able to be statically validated in linear or logarithmic time
88+
89+However, even if constraints lack a proper oracle such as an index or a static means of validation and, thus, cannot be validated in constant time, the user may still benefit from serialization of the database update expression since writing the validated tuples to disk can be deferred beyond commit time and could go directly into an on-disk cache.
90+
91+## Worst Case Behavior
92+
93+Every database constraint can be represented as an inclusion dependency whereby the evaluation of a relational expression `sub` must be a subset of the evaluation of relational expression `super` (`sub ⊆ super`) for the constraint to validate. Therefore, the worst case time to validate any constraint, assuming that the constraint has an ideal oracle, is O(n) in the tuple count. However, as mentioned above, there are many constraints that can be validated in constant or less-than-linear time. Furthermore, the validated tuples need not be written to disk once the constraint is found to hold.
94+
95+Since there is great variation in constraint validation cost, the RDBMS could pre-analyze and report on associated constraints costs or make use of data independence to guide storage to optimize queries needed to service the constraint checker.
96+
97+## Caveats
98+
99+Certain types of updates still take a similar amount of time to commit in Project:M36 in comparison to PostgreSQL. Specifically, any update which relies on data outside the database's purview will necessitate flushing the tuple data since the update expression contains new tuple data not based on existing tuples. For example, the equivalent of:
100+
101+```
102+INSERT INTO "BigTable"(a, b, c, x) VALUES (1,5,10,10),(20,20,21,30),.... #many tuples
103+```
104+will still necessitate a *O(n)* tuple writes to disk in both databases. Though the asymptotic costs are equivalent, the number of writes are cut in half in Project:M36 since it does not require a write-ahead log.
105+
106+While PostgreSQL makes use of MVCC (multi-version concurrency control) which marks which tuples belong to a linear progression of transaction states, Project:M36 stores a full history of database state using a transaction graph (a directed acyclic graph similar to the commit-based graph of `git`). The graph allows named branches to be created and merged which also reduce contention around a singular graph head.
107+
108+## Applying Laziness to SQL RDBMSes
109+
110+Would it be possible to apply transaction-based laziness to an SQL-based RDBMS? Certainly, with sufficient shoe-horning, it could work, but SQL includes a few malfeatures which would make it difficult, if not impossible:
111+
112+ * Non-idempotent server-side functions prevent laziness because of side effects. PostgreSQL can mark functions as idempotent, but does not validate or enforce the idempotence, Project:M36, via Safe Haskell, can validate pure functions.
113+ * The lack of "time travel", the ability to query database state in the past prevents reliance on previous states, prevents direct referencing of previous database states on which the state differences can be built.
114+ * Tightly-coupled table-to-storage management prevents alternative data models. Indexing and constraint checking need to be statically verifiable and deferrable.
115+
116+These hurdles are not insurmountable, just perhaps not a good fit for SQL databases with a lot of historical and implementation baggage.
117+
118+## Benchmarks
119+
120+Forthcoming.
121+
122+## Conclusion
123+
124+Transactional time-to-commit is critical in ensuring that business decisions can make it to non-volatile storage as quickly as possible. By introducing Haskell-like, lazy evaluation to update expressions and serializing the resultant thunk, commits can be serialized in constant time, disregarding the number of tuples modified in the expression.
125+
126+This serialization strategy turns modern RDBMS architecture on its head since the table/relation-to-file mapping is broken, resulting in true data independence. Any on-disk representation of a relation at a specific transaction state therefore merely becomes a cached and purgeable entity, drastically shrinking on-disk cacheing requirements while expanding the scope in which said strategies can operate. Hopefully, a truly data independent architecture will result in new optimization discoveries.
127+
128+Project:M36 implements a transaction graph which can represent the entirety of database state, leaving room for any number of alternative representations, even for a single relation or relation across transaction states. A simple example could include storing two different orderings of tuples of the same relation in order to optimally serve different join queries. Common RDBMSes offer only two on-disk representations: the set of fully-evaluated tuples and indexes to those tuples, preventing data independence. Data independence paves the way towards the elimination of implementation-specific, gatekeeper roles such as database administrators.
129+
130+The promise of the relational algebra has always been the liberation of data from its data structure representation in order to be able to answer arbitrary queries. Modern DBMSes which typically map tables directly to one or more files on disk fail to live up to this promise. Project:M36 sets out to rectify this failure.
131+
132+In a greater context, applying laziness to an architecture to make use of more interesting optimizations is hardly new. The OpenGL API views its "immediate" mode as effectively deprecated. Filesystems take advantage of laziness using copy-on-write semantics. High-level programming languages can make greater, more interesting inferences about how a computation must be execute. A computer can always consider many more possible solution paths than a human can.
133+
134+The adherence to mathematical priniciples in Project:M36 results in features and optimization opportunities which have not yet been discovered. In contrast to RDBMSes designed around specific optimizations (such as indexes, specific disk layouts, or key-value lookups), Project:M36 sets out to demonstrate practically that future optimizations can only be discovered when operating within a mathematically-coherent architecture.
docs/data_independence.markdownnew file+109
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1+# Project:M36: Towards an Architecture for Data Independence
2+
3+## Introduction
4+
5+The Project:M36 relational algebra architecture sets itself apart from typical DBMSes by ensuring strict transactional isolation, a branchable/mergeable (rather than linear) transaction graph, and storage of relational expressions (rather than storage of tuples). Let's look at how these architectural features work together to make Project:M36 the first relational algebra engine to implement true data independence.
6+
7+## What is Data Independence?
8+
9+C.J. Date writes:
10+
11+`Certainly most SQL products have failed to live up to the [relational] model's full potential...in those products, what the user sees and what is physically stored are essentially the same thing... In particular, it accounts for the argument, so often heard, to the effect that we have to "denormalize for performance."`
12+
13+`In principle, logical design has absolutely nothing to do with performance at all.`
14+
15+(Date, C.J. "Database In Depth: Relational Theory for Practitioners". O'Reilly Media. 2005. pages 156-157.)
16+
17+Data independence is therefore defined as the separation of the database user's experience from the database's means of in-memory or on-disk representation. As Date points out, virtually all database products implement a one-to-one mapping of relations to files in storage.
18+
19+One advantage of high-level abstractions in programming languages is to leverage advanced algorithms which can choose optimization paths on behalf of the user which a human may never be able to discover. While the promise of ever higher-level abstractions is realized by progamming languages such as Haskell, DBMS implementors have been resistant to data independence. This is due to several legacy factors such as companies pushing one-trick-pony database technologies and middlemen such as DBAs required to play gatekeeper against "bad" schema changes. The result is customers forced to run multiple disparate databases such as one for realtime transaction processing and another for analytics and another for audit logging. This recalcitrance has also led to the rise of databases such as "document" JSON databases with weak mathematical underpinnings in the name of performance as users become frustrated when hitting performance walls and dealing with arbitrary database limitations.
20+
21+Implementations which closely tie the user interface to backend representation close the door on interesting alternative representations and optimizations. For example, SQL databases typically store a single relation as a list of tuples on disk with supplementary indexes stored in separate files. There is no reason that the same relation couldn't be on disk or in memory in any number of formats. Such a table might be useful in various formats ideal for servicing different types of queries. Data independence grants the DBMS the permission to create any number of representations- including none at all- as long as the correct answer is provided to the user. "Column-store" databases may try to slice the tuples in a different axis, but those databases simply shift the performance problems elsewhere. Only implementation details prevent a database from offering both column-oriented *and* tuple-oriented representation while allowing the database to choose.
22+
23+That is why it is critical for the user's interface to the database *not* to include features such as "query hints" which would force a specific implementation in the backend. The user's interface must be declarative (describing the state change or query rather than *how* to execute it) and sufficiently high level. Any implementation detail leakage to the user's interface is a lost potential algorithmic optimization. While the topic of providing high-level interfaces is not specific to database design, we will continue to explore the ramifications of data independence in databases.
24+
25+
26+## Transactional Isolation
27+
28+While other databases offer various transaction isolation levels with differing levels of implementation-specific surprises, Project:M36 solely suppports the maximum transaction isolation level. Instead of relying on details of [MVCC](https://www.postgresql.org/docs/current/mvcc-intro.html) which marks each tuple in a relation with a monotonically-increasing number identifying from which transaction the tuple was added or deleted, Project:M36 includes no singular backing store for tuples, instead storing a stream of state change requests. Because the transaction graph supports branching and merging (similar to version control such as git), transactions can be committed without contention at a singular head of the graph. Committing to disk can be implemented as writing a file to represent the transaction's state and
29+
30+## The Transaction Graph
31+
32+These state changes are, in fact, the idempotent relational update expressions that the user has submitted. For example, given a transaction which includes a single relation `s`:
33+
34+```
35+┌──────────┬────────┬───────────┬───────────┐
36+│city::Text│s#::Text│sname::Text│status::Int│
37+├──────────┼────────┼───────────┼───────────┤
38+│"Paris" │"S2" │"Jones" │10 │
39+└──────────┴────────┴───────────┴───────────┘
40+```
41+
42+if the user commits a transaction with an insert such as:
43+
44+```
45+insert x relation{tuple{city "Boston", s# "S3", sname "Smith", status 400}}
46+```
47+
48+then a typical database will find the file representing the relation, find some free space in it and save the new tuple along with the MVCC transaction identifier. Subsequent transactions will find the tuple and compare it to their own transaction id in order to determine its "visibility". Project:M36, on the other hand, after validating that all relational constraints (such as primary and foreign keys) still hold, will simply serialize and append the expression to the transaction graph log. By default, there is no file representing the relation.
49+
50+For those familiar with Haskell, note how serializing the update expression is similar to being able to serialize a thunk or deferred execution.
51+
52+The transaction graph also allows users to travel back to previously-committed transactions. This may be useful for audit logging or alternative schemas.
53+
54+## Storage Representations
55+
56+Given the ever-growing transaction graph based on state changes, let's examine how Project:M36 services subsequent queries.
57+
58+## Benefits
59+
60+The primary goal of a database should be to ensure data integrity. Project:M36 takes no shortcuts in achieving this goal, but choosing a backend architecture which minimizes the time which it takes to get the transaction to non-volatile storage (disk) by storing update expressions rather than attempting to shuffle tuples on disk. This architecture open the door to many optimization techniques, many of which are new to databases.
61+
62+### Multiple On-Disk Representations
63+
64+The promise of data independence allows database backends to store relations as they see fit. That can include any number of on-disk representations including none at all. For example, for a table accessed by multiple projections, the database may choose to materialize the relation in those projections. The representations are therefore created in service to the queries submitted or anticipated instead of being based on past update expressions. Because on-disk storage is obviously limited, the database must decide what is valuable to keep around for future queries. This could open a new area of research into the appropriate machine learning algorithms, but, fundamentally, this set of materialized query responses is effectively a cache which can always be refreshed.
65+
66+The alternative representations need not be a direct answer to queries- for example, a materialized relation from a transaction could be used to service a query from a later transaction if the updates since that transaction are applied.
67+
68+The database could also anticipate, for example, scheduled queries and actually materialize relations before the query is executed. On-disk cache could represent "denormalized" tuple sets while the user-facing interface shows a properly normalized schema, thereby supporting data independence.
69+
70+More research in determining just what should be in the cache is needed.
71+
72+### Transactional Commits in O(1) Time
73+
74+Because the Project:M36 backend need not save tuples into a specific file representing a relation, the backend can drastically reduce the amount of time needed to commit a transaction to disk. Specifically, following constraint validation (which can often be done in constant or logarithmic time relative to the tuple count), the fastest means of committing the transaction is to save the update expression itself. Since the previous state has already been presumably committed, any idempotent operation can be saved for deferred execution. This means that transactions can be committed to disk relative to the size of the update expression rather than the number of the tuples affected- committing can occur at a rate relative to that of update expression size (typically a few kilobytes) rather than relative to the number of tuples that the update expression happened to alter.
75+
76+This technique gets transactions to disk faster, thus drastically increasing the rate transactions can be committed overall. Note that the execution of the update expression may be deferred by this process, so the cost to evaluate it may occur later, but this processing may be performed in the background after the transaction is committed. When the data is never requested, for example, for a defunct transaction graph branch, the actual execution could be deferred indefinitely, incurring zero cost to calculate the consquence of the update.
77+
78+### Less Disk Usage
79+
80+Because Project:M36 stores a stream of update expressions rather than tuples themselves, the minimum storage requirements for a given database may be reduced. For example, if a relation with an attribute `x` of type `Integer` has 1,000,000 tuples, a subsequent update to increment all 1,000,000 values by one may be cheaper to evaluate on-demand rather than immediately generating 1,000,000 new tuples and saving them to disk. If the new tuples are requested, the database can determine that the tuples are not materialized, calculate them, and return them, all without ever having the tuples on disk. Furthermore, if only a subset of the tuples are ever requested, for example, due to a query restriction, then some of the tuples may never need to be calculated or materialized.
81+
82+### Audit Logging
83+
84+Typical databases implement various strategies for audit logging, including:
85+
86+* exposing MVCC-like values such as tuple "created at" and "created by" to the user and forcing all tables to be insert-only
87+* shuttling audit logs to a secondary database
88+
89+Project:M36, through its inherent ability to travel the append-only transaction graph, enables audit-logging by allowing users to checkout previous transaction states. Committed transaction states are immutable, so no relation pollution or secondary database is necessary.
90+
91+### Selective Caching
92+
93+Typical databases materialize entire tuple sets representing each named relation (relation variable), but there is nothing special about relations that happen to be named. Data independence allows us to cache answers to common or even anticipated queries- this allows the schema to be normalized and unmaterialized while the *denormalized* query results are materialized cached. This flexibility saves disk space and allows the cache to be much more dynamic than in a typical DBMS.
94+
95+### Never-Materialized Tuples Replace Partitions
96+
97+Queries on very large relations often very often restricted (filtered by tuple) to generate subsets which are often partitioned, for example, by an event's date. Instead of requiring DBMS users to manually partition and slice their data in one, fixed, particular way, Project:M36's cacheing system will only cache those tuples that serve the interests of the queries. With something like an LRU cache, a data independent architecture will naturally cache "partitions" of the full relation without manual intervention.
98+
99+### Elimination of DBA role
100+
101+Databases essential to a business function are often guarded by a human database administrator (DBA) whose role it is to monitor database performance and to play gatekeeper to database schema changes as the database grows. This role is necessary because database tuning can be an arcane skill, rife with pitfalls for those who don't know the database software inside-and-out. This is a direct cause of data dependence, forcing DBAs to manually enforce data partitioning and shuffling data to different servers, configuring database replicas, and making Faustian bargains to "denormalize" tables for analytical workloads.
102+
103+A data independent architecture eliminates this role by allowing the database to make the optimal choices itself. This means that the database can respond to schema changes immediately, without manual repartitioning or denormalization steps.
104+
105+## Conclusion
106+
107+Project:M36's backend architecture enables new optimizations and features that are sorely lacking in existing DBMSes. By leveraging its novel transaction graph and deferred evaluation, Project:M36 handles more DBMS use-cases.
108+
109+Project:M36's novel architecture opens the door for further database and algorithmic research.
docs/database_context_functions.markdownnew file+167
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1+# Project:M36 Database Context Functions
2+
3+## Introduction
4+
5+While "atom functions" operate on individual values and return new values (atoms), database context functions operate on pre-committed database contexts in the same context as the ```update```, ```insert```, and ```delete``` operators. The difference is that database context functions are written in Haskell and support any number of context changes.
6+
7+Other DBMS software may include a similar feature called "stored procedures". However, "stored procedures" are stored outside the transaction stream and are not versioned by the database as in Project:M36.
8+
9+In order to use compile functions at runtime in Project:M36, be sure to build your own Project:M36 library so that the optional scripting is enabled. Alternatively, precompiled database context functions can be loaded from object files.
10+
11+## Database Context Function Types
12+
13+The Haskell type of all database context functions is:
14+
15+```haskell
16+[Atom] -> DatabaseContext -> Either DatabaseContextFunctionError DatabaseContext
17+```
18+
19+That is, the function takes an array of ```Atom```s which represent the function's arguments and a context and returns an updated context or an error. Notice that this operation is idempotent ("pure" in Haskell parlance).
20+
21+The database context references all data which can be committed; this includes relation variables, atom functions, notifications, database context functions, and other versionable data. Database contexts become immutable once committed.
22+
23+## Scope of Database Context Functions
24+
25+Database context functions are committed alongside the transaction. Thus, previous versions of the functions can be explored or restored. Like all database context elements, database context functions are immutable once committed. However, the transaction graph can be branched in order to examine how database context functions changes might apply to future contexts.
26+
27+Remember that database context functions don't need to worry about locks or other synchronization. The database context is completely isolated from other ongoing transactions.
28+
29+Returning a ```DatabaseContextFunctionError``` from the function ensures that any changes made by the function are discarded.
30+
31+## TutorialD Demonstration
32+
33+Use ```adddatabasecontextfunction``` to compile and name a new database context function:
34+
35+```
36+adddatabasecontextfunction "addperson" Int -> Text -> DatabaseContext -> Either DatabaseContextFunctionError DatabaseContext """(\(age:name:_) ctx -> let newrel = MakeRelationFromExprs Nothing [TupleExpr (fromList [("name", NakedAtomExpr name),("age", NakedAtomExpr age)])] in if isRight (executeRelationalExpr (RelationVariable "person" ()) ctx) then executeDatabaseContextExpr (Insert "person" newrel) ctx else executeDatabaseContextExpr (Assign "person" newrel) ctx) :: [Atom] -> DatabaseContext -> Either DatabaseContextFunctionError DatabaseContext"""
37+```
38+
39+This function is quite dense, so let's examine its components.
40+
41+The first components are:
42+
43+```
44+adddatabasecontextfunction "addperson" Int -> Text -> DatabaseContext -> Either DatabaseContextFunctionError DatabaseContext
45+```
46+
47+which defines a function "addperson" which takes three arguments (an Int value, a Text value, and a DatabaseContext) and returns a DatabaseContext. All database context functions take as a final argument a database context and must return a database context.
48+
49+The meat of the function is obviously the Haskell, so let's lay it out:
50+
51+```haskell
52+(\(age:name:_) ctx -> let newrel = MakeRelationFromExprs Nothing [TupleExpr (fromList [("name", NakedAtomExpr name),("age", NakedAtomExpr age)])] in
53+ if isRight (executeRelationalExpr (RelationVariable "person" ()) ctx) then
54+ executeDatabaseContextExpr (Insert "person" newrel) ctx
55+ else
56+ executeDatabaseContextExpr (Assign "person" newrel) ctx)) :: [Atom] -> DatabaseContext -> Either DatabaseContextFunctionError DatabaseContext
57+```
58+
59+Line 1 sets up a new relation created from the function's arguments. In this case, we create a relation to represent a new person in our database.
60+
61+Line 2 determines if the "person" relation variable is already available in the context. If so, the function inserts the new "person" relation into the existing relation variable in line 3.
62+
63+In line 5, since the relation variable was determined not yet to be defined, we assign the new person relation directly.
64+
65+Note that there is nothing special about the Haskell above- it is indeed a full-blown Haskell environment; however, this environment operates in "Safe" mode which prohibits any non-pure function access (such as with ```unsafePerformIO```). Thus, it is safe to use as a trusted programming environment with users creating arbitrary convenience functions within the implicit sandbox.
66+
67+Users can add arbitrary (but safe and pure) calculations to these functions to capture business logic. The list of modules available within the function context can be modified at compile-time.
68+
69+Let's try the new function!
70+
71+```
72+TutorialD (master/main): execute addperson(30, "Steve")
73+TutorialD (master/main): :showexpr person
74+┌────────┬──────────┐
75+│age::Int│name::Text│
76+├────────┼──────────┤
77+│30 │"Steve" │
78+└────────┴──────────┘
79+TutorialD (master/main): execute addperson(32, "Bob")
80+TutorialD (master/main): :showexpr person
81+┌────────┬──────────┐
82+│age::Int│name::Text│
83+├────────┼──────────┤
84+│32 │"Bob" │
85+│30 │"Steve" │
86+└────────┴──────────┘
87+TutorialD (master/main):
88+```
89+
90+Here we see that the first call to ```addperson``` created the relation variable while a subsequent call added another tuple to the existing relation variable.
91+
92+## Haskell access
93+
94+Database context functions come in two varieties:
95+
96+* scripted (as above)
97+* pre-compiled
98+
99+If you are dealing with the Haskell interface directly and you don't anticipate changing the functions, the easiest option is to compile your Haskell database context function into the database. It can always be removed or supplanted by a scripted version later.
100+
101+To add a new, compiled database context function to the database, use:
102+
103+```haskell
104+executeDatabaseContextIOExpr sessionId dbconn (AddDatabaseContextFunction funcName Nothing (\(arg1:arg2:_) ctx -> ...))
105+```
106+from the ```ProjectM36.Client``` module.
107+
108+The function can be executed using:
109+
110+```haskell
111+executeDatabaseContextExpr sessionId dbconn (ExecuteDatabaseContextFunction funcName atomArgList)
112+```
113+from the same module.
114+
115+## Loading Precompiled Modules
116+
117+Database context functions compiled with GHC to object files can be loaded at runtime. Let's walk through an example:
118+
119+```haskell
120+module DynamicDatabaseContextFunctions where
121+import ProjectM36.Base
122+import ProjectM36.Relation
123+import ProjectM36.DatabaseContextFunctionError
124+import qualified ProjectM36.Attribute as A
125+
126+import qualified Data.Map as M
127+
128+
129+someDBCFunctions :: [DatabaseContextFunction]
130+someDBCFunctions = [DatabaseContextFunction {
131+ dbcFuncName = "addtestrel",
132+ dbcFuncType = [],
133+ dbcFuncBody = DatabaseContextFunctionBody Nothing addTestRel
134+ }]
135+ where
136+ addTestRel _ ctx = do
137+ let attrs = A.attributesFromList [Attribute "word" TextAtomType]
138+ eRel = mkRelationFromList attrs [[TextAtom "nice"]]
139+ case eRel of
140+ Left err -> Left (DatabaseContextFunctionUserError (show err))
141+ Right testRel ->
142+ pure $ ctx { relationVariables = M.insert "testRel" testRel (relationVariables ctx) }
143+```
144+
145+The function returns a list of `DatabaseContextFunction`s (just one in this case). The function adds a relation variable to the current database context.
146+
147+Compile it with GHC:
148+
149+```
150+cabal exec ghc -- examples/DynamicDatabaseContextFunctions.hs -package project-m36
151+```
152+
153+or invoked GHC via stack.
154+
155+Finally, connect to your database with `tutd` and load the module:
156+
157+```
158+TutorialD (master/main): loaddatabasecontextfunctions "DynamicDatabaseContextFunctions" "someDBCFunctions" "examples/DynamicDatabaseContextFunctions.o"
159+```
160+
161+If the load reports an "unknown symbol" error, double check that the installed "project-m36" package is identical to one used to link the Haskell module.
162+
163+Note that such functions do not survive a server restart; this will likely be improved in a future release.
164+
165+## Future Improvements
166+
167+There are likely a variety of convenience functions which would make sense in the context of the scripted function. If you have ideas for such functions, please open a GitHub issue.
docs/dataframes.markdownnew file+53
@@ -0,0 +1,53 @@
1+# Project:M36 DataFrames
2+
3+Users of typical relational algebra engines have come to expect sorting and limiting of query results despite the fact that relations do not support ordering. To that end, Project:M36 supports converting relations to "data frames" to support sorting on attributes and limiting the maximum tuple count in the result set.
4+
5+The equivalent feature in SQL is invoked by the `ORDER BY`, `LIMIT`, and `OFFSET` clauses.
6+
7+## Usage
8+
9+From within the `tutd` console, converting a relation to be sorted as a data frame is invoked using the `:showdataframe` command.
10+
11+```
12+:showdataframe <relational expression> orderby {<attribute {ascending,descending}>} {offset <num>} {limit <num>}
13+```
14+
15+The default sort order is `ascending`.
16+
17+## Examples
18+
19+```
20+TutorialD (master/main): :showdataframe s orderby {status}
21+┌──┬───────────┬─────────┬────────────┬────────────────┐
22+│DF│city::Text↕│s#::Text↕│sname::Text↕│status::Integer⬆│
23+├──┼───────────┼─────────┼────────────┼────────────────┤
24+│1 │"Paris" │"S2" │"Jones" │10 │
25+│2 │"London" │"S1" │"Smith" │20 │
26+│3 │"London" │"S4" │"Clark" │20 │
27+│4 │"Athens" │"S5" │"Adams" │30 │
28+│5 │"Paris" │"S3" │"Blake" │30 │
29+└──┴───────────┴─────────┴────────────┴────────────────┘
30+TutorialD (master/main): :showdataframe s{status} orderby {status}
31+┌──┬────────────────┐
32+│DF│status::Integer⬆│
33+├──┼────────────────┤
34+│1 │10 │
35+│2 │20 │
36+│3 │30 │
37+└──┴────────────────┘
38+TutorialD (master/main): :showdataframe s{status} orderby {status descending} limit 1
39+┌──┬────────────────┐
40+│DF│status::Integer⬇│
41+├──┼────────────────┤
42+│1 │30 │
43+└──┴────────────────┘
44+TutorialD (master/main): :showdataframe s{status} orderby {status descending} offset 1 limit 3
45+┌──┬────────────────┐
46+│DF│status::Integer⬇│
47+├──┼────────────────┤
48+│1 │20 │
49+│2 │10 │
50+└──┴────────────────┘
51+
52+```
53+The arrow in the attributes indicates the sort order while the DF column indicates the row number based on the sort order. Column ordering can also be arbitrary.
docs/filesystem-persistence.markdownnew file+128
@@ -0,0 +1,128 @@
1+# Project-M36 Filesystem Persistence (Change Proposal)
2+
3+## Introduction
4+
5+Existing database persistent storage is not suitable for Project:M36 storage for several reasons:
6+
7+* typical SQL storage doesn't support relation-valued attributes
8+ * Project:M36 supports nested relations, relations as values- a useful feature of the relational algebra
9+* typical SQL storage relies on writing and rewriting files to save space
10+ * Project:M36 uses a write-one-read-many strategy to support database branching, concurrency, and compression
11+* typical SQL storage maps each table to one or more files
12+ * Project:M36 obviates the one-to-one mapping between relation variables and files and allows for multiple representations of a single relation variable and evaluated expressions on disk
13+* typical SQL storage maintains only the latest state of the database
14+ * Project:M36 stores a graph of transactions and supports multiple heads of contention
15+* typical key-value storage is poorly typed or even schemaless
16+ * Project:M36 is strongly-typed which enforces correctness and can benefit compression schemes and performance
17+
18+## Requirements
19+
20+* storage of an append-at-leaves (transaction) graph with highly concurrent read access
21+* database [durability](https://en.wikipedia.org/wiki/ACID#Durability)
22+* extensibility
23+ * examples include future compression types, dynamic atom (value) types, database context extensions, new relation types (such as recurrence relations), backwards-compatibility for atom values
24+* platform-agnosticism
25+ * postgresql's C-struct-to-disk design means that switching platforms requires a dump-and-restore, even if the database directory can be physically moved to the new machine- it's not always clear what constitutes a platform changes (float/int timestamps)
26+* upgradeability
27+ * postgresql software upgrades require painful database dump-and-restores or pg_upgrade, causing downtime
28+ * be able to read older formats to prevent costly data-rewrites
29+* backwards-compatibility
30+ * no one wants to rewrite their database files during upgrades, even if it is on-the-fly like with pg_upgrade
31+* multiple remote readers and writers to the storage
32+ * mutliple servers can read/write the same storage over networked filesystems as long as there are some basic locking guarantees
33+ * multiple servers can read the same storage without locking guarantees
34+ * we can protect WORM storage with fine-grained locking and still maintain high-concurrency
35+* singular format for data export/import (dump/restore)
36+ * we won't need a pseudo-cross-platform dump format (like pg_dump's output) because the file format is already cross-platform
37+ * sharing the format for internal and external usage means we can share the same tools
38+ * the dump format can be a subset of the internal format
39+* existence of a Haskell-based serialization library
40+* POSIX filesystem semantics and atomicity guarantees
41+
42+## Current, Insufficient Design
43+
44+### Filesystem Requirements
45+
46+* POSIX, journaled filesystem
47+ * ext3/4, xfs, etc.
48+ * simulate POSIX semantics on Windows possibly with locking
49+
50+The first pass of the on-disk storage for Project:M36 was implemented with a focus on correctness, but not performance or intelligent disk storage usage. As such, it is valuable as a baseline for the new implementation.
51+
52+* uses Data.Binary to serialize entire Haskell data structures to disk
53+* includes lots of redundancy
54+ * for example, each new transaction writes all current relation variables to disk- instead, we should be able to reference unchanged relvars from previous transactions (they are already safely on disk)
55+* loses the in-memory data structure sharing that was present when writing the data (one of the benefits of immutable data structures)
56+* writes a platform-specific format
57+* is not extensible, backwards-, or forwards-compatible
58+* cannot be used as a portable, exportable format
59+* compression is all-or-nothing
60+
61+### Directory Layout
62+
63+* /m36v*x* - includes a human-readable transaction graph listing. The *x* references the version of persistence format.
64+* /lockFile - an empty file used for synchronizing multiple project-m36 server contending for the transaction graph
65+* /heads - a human-readable mapping of head names to transaction ids
66+* /<transaction id> - a directory containing all data needed to reconstruct a transaction
67+ * /atomfuncs - a Binary-serialized listing of `AtomFunction`s
68+ * /dbcfuncs - a Binary-serialized listing of `DatabaseContextFunction`s
69+ * /incdeps - a Binary-serialized listing of `InclusionDependency`s
70+ * /info - a Binary-serialized listing of `TransactionInfo` (current and parent transaction ids)
71+ * /relvars - a directory containing files named after the relvars with each file's contents being a serialized `Relation`
72+ * dynamic names should not appear in the filesystem as the filesystem naming requirements will be different from Project:M36 naming requirements
73+ * /schemas - a Binary-serialized listing of alternative isomorphic schemas
74+ * /typecons - a Binary-serialized listing of `TypeConstructor`s (data types)
75+
76+## New, Shiny, Proposed Design
77+
78+### Directory Layout
79+
80+Most of the existing directory layout remains useful. The one-transaction-per-directory layout maximizes read performance using a WORM strategy. Later transactions can refer to past transactions to cut down on immediate IO. Due to the idempotence of the `DatabaseContextExpr`, we can optionally serialize the expression itself to further reduce and defer IO. Deferred updates can be resolved on-demand or in the background by replacing transaction directories, individual files, or by adding supplementary relation representations (more on these below).
81+
82+Improvements:
83+
84+* wrap up small objects together
85+ * We experienced unnecessarily high disk usage when saving atom functions in individual files. Wrap up smaller data structures (especially when less than 4KB) into one file.
86+* use [cbor](https://github.com/well-typed/cborg) binary format to allow external tools to be able to read the on-disk format
87+ * the cbor format allows for forwards and backwards compatibility for atom types and includes relevant built-in types
88+
89+### Relation representations
90+
91+One area where almost every DBMS has fallen flat is in *data independece*, the separation between the logical database state representation and the on-disk format. Project:M36 aims to remedy this with "relation representations" which acknowledges that every relation (including the results of relational expresssions) can have multiple on-disk or in-memory representations. The purpose of a query planner is to choose the optimal representation for the given request.
92+
93+Most DBMSes do make an inadvertent attempt to support multiple relation representations via indexes. An index can be viewed as an independent representation of a relation in a different format (optimized for certain queries), but these same DBMSes fail to hide this abstraction in the logical layer, instead forcing users to create and maintain indexes as a separate entity.
94+
95+Relational representations, however, are never presented to the user of the logical layer of the database. Such representations can be created automatically. For example, if a certain query result (always a relation) is requested often, the DBMS may choose to cache the result as a relation representation mapped to the query itself. Thereafter, if the query is requested again (within an unchanged database state, of course), the planner can choose to send the pre-computed result back. This is known as a "query cache", but we can extend this same model to any other possible representation.
96+
97+Another representation type includes alternative representations of a relation variable's value designed for specific projections or restrictions. For example, a relation may be stored on disk as a btree with the nodes representing a relation's key. This is obviously equivalent to an index (either populated with the remainder of the tuple attributes or not, if the query is merely checking for existence).
98+
99+Note that if two relation representations are isomorphic, as in the example of a btree containing the key and remaining tuple values, then all other representations of the same relation are redundant. Under storage pressure, we can delete all but one representation. Which one the DBMS chooses to delete is arbitrary. When we have adequate space, we can create additional representations in the background without affecting correctness.
100+
101+The on-disk representation need not correspond to the logical relation variables at all. Besides query caches, the DBMS can freely store multiple relations in the same file as long as there is a relational expression to distinguish between the logical relation variables. Conversely, a single relation variable's value could span multiple files, simulating what other DBMSes call sharding but without exposing the implementation details to the users.
102+
103+Considering that user involvement in the creation of relation representations is the norm, how can the DBMS create such representations and maintain them automatically? This will likely be an area of research, but we can start simply with a query cache and automatic cost-based indexing based on actual queries executed.
104+
105+When broken free from user control, the DBMS is free to create arbitrary representations with the only consideration being available IO and memory resources.
106+
107+### Deferred updates
108+
109+Virtually all DBMSes execute database updates against existing files which store tuples. However, because Project:M36 updates are idempotent, we can save expressions to disk for *deferred updates*. Database update expressions saved to disk can drastically increase the rate at which we can execute updates because the expression is likely far smaller than the number of tuples which the expression will change. Because Project:M36 uses per-transaction directories, once a deferred update is actually evaluated, the directory can be atomically replaced with the evaluated result. Of course, to save disk storage and IO, the DBMS can also choose to discard the evaluated result and continue to store the update. This is nothing novel- git does this by storing code diffs between commits. The only novelty is in recognizing the value of idempotent updates.
110+
111+### Linked relations
112+
113+Every database update creates a new state based on an old state and an update expression. In the previous section, we demonstrated how the expression along with the previous state is sufficient to create the new state. Alternatively, the DBMS can also store a "diff" (difference) in the form of a relational expr with a link to the previous state.
114+
115+For example, if we have a relation variable of employees' names and we insert another employee name, the new state is the union of the previous state of the relation variable and a relation containing the new employee's name. The evaluated expression which requests the new state is merely replaced with the union- similar to a macro.
116+
117+This strategy can also be viewed as a form of compression. In the general case where a relation variable has not changed from one transaction to the next transaction, we can merely store what amounts to a symbolic link to the relation variable in the previous state.
118+
119+### Risks of Redesign
120+
121+* cborg module has had only one release, is probably less than ready for production use, but the initial results are promising and is developed and backed by well-known Haskellers and a Haskell shop
122+ * are there alternatives we should consider?
123+* increased code complexity
124+ * executor needs to be separated from current relational EDSL to support scanning various types of relation representations
125+ * the new EDSL may not leak its representations to the user-level EDSL
126+ * query executor will need access to the full transaction graph to cover relation links and deferred updates; currently, all state is wrapped up into the `DatabaseContext`
127+* how and when to create new relation representations and when to defer updates will be an active area of research
128+* requires more consideration in reducing IO and storage requirements; this was not a major driver of the initial design
docs/import_export_csv.markdownnew file+65
@@ -0,0 +1,65 @@
1+# Project:M36 CSV Import/Export
2+
3+Project:M36's `tutd` console supports the import and export of CSV files as a lowest-common denominator format for moving data. Because the CSV file format does not support all the features of Project:M36- most notably, nested relations- not all relation variables can be marshalled to-and-from CSV files.
4+
5+## CSV Export
6+
7+If a relation variable cannot be exported due to data types which are not supported by the CSV format- such as with a nested relation- then Project:M36 throws an error rather than export a partial file.
8+
9+### Example Export
10+
11+```
12+TutorialD (master/main): :importexample cjdate
13+TutorialD (master/main): :exportcsv s "/tmp/csv"
14+```
15+```
16+$ cat /tmp/csv
17+s#,sname,status,city
18+S2,Jones,10,Paris
19+S1,Smith,20,London
20+S4,Clark,20,London
21+S5,Adams,30,Athens
22+S3,Blake,30,Paris
23+```
24+
25+## CSV Import
26+
27+An import is equivalent to an insert and does not replace the target relation variable.
28+
29+Because relations do not have a natural ordering for their attributes, the CSV file to import must contain a header row which matches the names of attributes.
30+
31+If a value in the CSV file cannot be converted to the expected type (determined by the existing relation attributes), then the entire import is aborted rather than perform a partial import.
32+
33+### Example Import
34+```
35+$ cat /tmp/csv
36+s#,sname,status,city
37+S6,Samson,100,New York
38+```
39+```
40+TutorialD (master/main): :importexample cjdate
41+TutorialD (master/main): :showexpr s
42+┌──────────┬────────┬───────────┬───────────────┐
43+│city::Text│s#::Text│sname::Text│status::Integer│
44+├──────────┼────────┼───────────┼───────────────┤
45+│"Paris" │"S2" │"Jones" │10 │
46+│"Paris" │"S3" │"Blake" │30 │
47+│"London" │"S4" │"Clark" │20 │
48+│"London" │"S1" │"Smith" │20 │
49+│"Athens" │"S5" │"Adams" │30 │
50+└──────────┴────────┴───────────┴───────────────┘
51+TutorialD (master/main): :importcsv "/tmp/csv" s
52+TutorialD (master/main): :showexpr s
53+┌──────────┬────────┬───────────┬───────────────┐
54+│city::Text│s#::Text│sname::Text│status::Integer│
55+├──────────┼────────┼───────────┼───────────────┤
56+│"Paris" │"S3" │"Blake" │30 │
57+│"London" │"S4" │"Clark" │20 │
58+│"New York"│"S6" │"Samson" │100 │
59+│"Athens" │"S5" │"Adams" │30 │
60+│"London" │"S1" │"Smith" │20 │
61+│"Paris" │"S2" │"Jones" │10 │
62+└──────────┴────────┴───────────┴───────────────┘
63+```
64+
65+Note that relations do not have ordering, thus, no ordering from the CSV file is preserved.
docs/index.markdown−1
@@ -3,5 +3,4 @@
331. [Introduction to ProjectM36](introduction_to_projectm36.markdown)
441. [TutorialD Tutorial](tutd_tutorial.markdown)
551. [Transaction Graph Operators](transaction_graph_operators.markdown)
6−1. [Persistent Library Driver](persistent_library_driver.markdown)
761. [ProjectM36.Client Library](projectm36_client_library.markdown)
docs/introduction_to_projectm36.markdown+39−13
@@ -1,7 +1,7 @@
11# Introduction to Project:M36
22
33## What is Project:M36?
4−Project:M36 is a relational-algebra-based database management system. It can be used a production-level database backend or for learning more about the relational algebra.
4+Project:M36 is a relational-algebra-based database management system. It can be used as a production-level database backend or for learning more about the relational algebra.
55
66The principled mathematical approach to Project:M36's design sets it apart from competing DBMSs. Specifically, Project:M36 adheres strongly to the mathematics of the relational algebra and makes no compromises nor apologies in doing so. To that end, Project:M36 is implemented in the programming language "Haskell" which is itself based on the lambda calculus.
77
@@ -15,40 +15,66 @@ The relational algebra is the mathematical model underpinning Project:M36. When
1515
1616## Binary Releases
1717
18−### Windows
19−Project:M36 now provides binary installations for Windows. Check the (releases page)[https://github.com/agentm/project-m36/releases] for downloads.
18+The quickest and preferred method of installation is via docker, which works on Linux, macOS, and Windows. Docker downloads and runs preconfigured software in secure, sandboxed containers, preventing third-party software from altering the host system without your permission.
2019
21−### MacOS X
20+### Install Docker:
2221
23−Binary releases are not yet available for MacOS X, but compiling from source is easy.
22+* [Windows 10 Docker Installation](https://docs.docker.com/docker-for-windows/wsl/)
23+* [MacOS Docker Installation](https://docs.docker.com/docker-for-mac/install/)
24+* [Linux Docker Installation](https://docs.docker.com/engine/install/#server)
2425
25−### Linux
26+### Run TutorialD from Docker Image
2627
27−The currently-preferred method of installation is from source. A future enhancement would be installation from deb or rpm.
28+This downloads the docker image tagged "latest" and runs `tutd`, the TutorialD command line interface. Try the [15-Minute TutorialD Tutorial](15_minute_tutorial.markdown) and try some expressions.
29+
30+```bash
31+docker run -it projectm36/project-m36 tutd
32+```
33+
34+### Run Project:M36 Server
35+
36+The default port for the project-m36 server is 6543.
37+
38+```bash
39+docker run --network host projectm36/project-m36 project-m36-server -n <database_name>
40+```
41+
42+### Connect to Project:M36 Server
43+
44+```bash
45+docker run --network host projectm36/project-m36
46+```
2847
2948## Source Installation
3049
3150Requirements:
3251
33−* [GHC 7.10 or greater](https://www.haskell.org/downloads)
52+To build with stack:
53+
54+* [GHC 8.6.5 or greater](https://www.haskell.org/downloads)
3455* [Haskell stack](https://docs.haskellstack.org/en/stable/README/)
35−* Linux, MacOS X, or Windows OS
56+* Linux, macOS, or Microsoft Windows
3657
3758Compilation steps:
3859
3960* ```git clone https://github.com/agentm/project-m36```
4061* ```cd project-m36```
41−* ```stack build```
62+* ```stack --stack-yaml stack.ghc8.6.yaml build```
4263
4364At this point, the TutorialD interactive interpreter can be run using ```stack exec tutd```.
4465
66+Alternative building with GHC 8.6.5 or greater:
67+
68+* ```cabal new-build```
69+
70+The resultant binaries can be found in ```./dist-newstyle/build/project-m36-<version>/build```.
71+
4572## Accessing Project:M36 Databases
4673
4774Project:M36 implements a generic relational algebra DBMS backend with multiple data access frontends. Such frontends currently include:
4875
4976* TutorialD: Chris Date's interactive language for learning about the relational algebra
5077* ProjectM36.Client: a Haskell library for native access
51−* Database.Persist.ProjectM36: a driver for the Haskell persistent library
5278
5379More frontends are expected to be supported in the future.
5480
@@ -60,7 +86,7 @@ In addition to being a relational algebra engine, Project:M36 supports features
6086
6187Most DBMSs provide a way to allow the user to specify atomic database state changes. These changes are often wrapped up as "transactions" which, when applied to the database state, offer the illusion of sequential and grouped, atomic changes applied to the databases. Often the only state which can be queried is the snapshot at the time the transaction is opened.
6288
63−Project:M36 extends this transaction model with the "transaction graph". This feture can be adequately described as version control for transactions. In the legacy DBMS model, the transactions are added to a linear transaction stream where each client is contending over the "head" of the stream- the latest transactions. In the transaction graph model, clients can add named branches and add transactions to the branches, then merge changes back, if necessary.
89+Project:M36 extends this transaction model with the "transaction graph". This feature can be adequately described as version control for transactions. In the legacy DBMS model, the transactions are added to a linear transaction stream where each client is contending over the "head" of the stream- the latest transactions. In the transaction graph model, clients can add named branches and add transactions to the branches, then merge changes back, if necessary.
6490
6591This feature is useful, for example:
6692* during testing- create a testing branch which production will never see. This obviates the need for a separate production data set.
@@ -82,7 +108,7 @@ Decreasing a transaction's durability can reduce IO contention at the cost of re
82108
83109### Native Haskell Compatibility
84110
85−Any Haskell data type which implements the ```Atom``` typeclass can be manipulated as a value in the database.
111+Any Haskell data type which implements the ```Atomable``` typeclass can be manipulated as a value in the database.
86112
87113Haskell functions which operate on those values can also be added to the database.
88114
docs/introduction_to_the_relational_algebra.markdown+44−13
@@ -16,7 +16,7 @@ Let us begin by starting with the smallest units in the relational model and wor
1616
1717A value is a typed, singular unit of data.
1818
19−Common examples could be a number indicating a person's age, the number of dollars in a bank account, or a street address used for delivery. In all cases, a value must be of a specific type and must support the notion of equality.
19+Common examples could be a number indicating a person's age, the number of dollars in a bank account, or a street address used for delivery. In all cases, a value must be of a specific type and must support the notion of equality.
2020
2121As an example, it doesn't make sense to ask if a person's age is equal to a street address; the relational model can enforce this- this is called "type safety" and is the motivation for using types.
2222
@@ -38,11 +38,11 @@ An attribute is a pair containing an attribute name along with an attribute type
3838
3939Examples:
4040* An "Address" attribute name is of type "Text":
41−
41+
4242(Address, Text)
4343
4444* An "Current Balance" attribute name is of type "Dollar Amount":
45−
45+
4646(Current Balance, Dollar Amount)
4747
4848#### Tuple
@@ -62,7 +62,7 @@ In the last example, the fact that the car failed the inspection is implied by t
6262
6363#### Relation
6464
65−A relation is a container of values organized by tuples of the same type. Specifically, a relation is a set of attributes (a relation header) mapped over a set of tuples (a relation body). Note that this implies that tuples cannot appear more than once since a set can only hold unique items.
65+A relation is a container of values organized by tuples of the same type. Specifically, a relation is a set of attributes (a relation header) mapped over a set of tuples (a relation body). Note that this implies that tuples cannot appear more than once since a set can only hold unique items.
6666
6767When a tuple appears in a relation, a relation's attributes and respective types must match that of all of its tuples. Thus, a relation's header summarizes the attribute names and types of all of its constituent tuples.
6868
@@ -116,7 +116,7 @@ To reiterate, the transition from T1 to T2 replaced the "Employees" relation var
116116
117117#### Relational Operators
118118
119−Since we refer to the relational algebra as a closed algebra, all relational operators necessarily operate on and generate relations. The purpose of the operators is allow data modelers to answer questions (queries) based on the current state of the database. For example, a modeler may wish to know the ages of the employees working in the accounting department. The modeler can then compose the relational operators together to answer this and virtually any other conceivable query.
119+Since we refer to the relational algebra as a closed algebra, all relational operators necessarily operate on and generate relations. The purpose of the operators is allow data modelers to answer questions (queries) based on the current state of the database. For example, a modeler may wish to know the ages of the employees working in the accounting department. The modeler can then compose the relational operators together to answer this and virtually any other conceivable query.
120120
121121##### Project
122122
@@ -186,7 +186,7 @@ Note that rename does not alter the type of the attribute in question.
186186
187187##### Join
188188
189−One of the most essential-to-understand operators is the join operator. Unlike the previous two unary (single relation argument) operators, join operates on two (or potentially more) relations. The purpose of a join is to merge multiple relations into one relation in order to determine the relationships between data across relations. For example, there are good reasons (which have not yet been explained) why a relation representing a company's products and records of when those products were shipped should be two disparate relations. The join operators merges relation A and relation B by returning a new relation with the attribute sets of both relation headers merged and with a body of the tuples merged if-and-only-if the in-common attributes' values are equal.
189+One of the most essential-to-understand operators is the join operator. Unlike the previous two unary (single relation argument) operators, join operates on two (or potentially more) relations. The purpose of a join is to merge multiple relations into one relation in order to determine the relationships between data across relations. For example, there are good reasons (which have not yet been explained) why a relation representing a company's products and records of when those products were shipped should be two disparate relations. The join operators merges relation A and relation B by returning a new relation with the attribute sets of both relation headers merged and with a body of the tuples merged if-and-only-if the in-common attributes' values are equal.
190190
191191In the case where no attributes are in common between the relations, the join operator becomes a cross-product operator; this is not a special case, rather a logical consequence of the definition.
192192
@@ -202,13 +202,13 @@ Join (Instructor relation)
202202
203203(Course Relation)
204204
205−|(Course Name, Course Name Type)|(Instructor, Instructor Name Type)|(Course Room Number, Room Number Type)|
205+|(Course Name, Course Name Type)|(Instructor Name, Instructor Name Type)|(Course Room Number, Room Number Type)|
206206|-------------------------------|----------------------------------|--------------------------------------|
207207|English 1|Steve|Room 104|
208208|French 2|Bob|Room 103|
209209|English 2|Steve|Room 104|
210210
211−["Instructor Name" is the in-common attribute]
211+["Instructor Name" is the in-common attribute]
212212===>
213213
214214|(Instructor Name, Instructor Name Type)|(Office Number, Office Number Type)|(Course Name, Course Name Type)|(Course Room Number, Room Number Type)|
@@ -259,7 +259,7 @@ Examples:
259259
260260group ("Name") as "SameAgePeople"
261261
262−|(Name, Name Type)|(Age, Age Type)|
262+| (Name, Name Type)|(Age, Age Type) |
263263|-----------------|---------------|
264264|Steve|12|
265265|Cindy|12|
@@ -301,6 +301,37 @@ ungroup ("Pets")
301301
302302Note that Bob does not appear in the result relation because he has no pets.
303303
304+#### Difference
305+
306+The difference operator ("minus" in TutorialD) receives two relations of the same type (same attributes) as arguments rvA and rvB and returns a relation which contains tuples in rvA which are not found in rvB. This operator is similar to set difference.
307+
308+Example:
309+
310+* Show a relation of non-managers by starting with the relation of employees and removing the employees found in the manager relation.
311+
312+Employees
313+
314+|(Name, Name Type)|
315+|-----------------|
316+| Bob |
317+| Jim |
318+| Steve |
319+| Bart |
320+
321+Managers
322+
323+|(Name, Name Type)|
324+|-----------------|
325+| Bob |
326+| Steve |
327+
328+====>
329+
330+|(Name, Name Type)|
331+|-----------------|
332+| Jim |
333+| Bart |
334+
304335### Displaying Relations
305336
306337Note that in the above operator examples, the order of the tuples appears to shift around. Since a relation body is a set of tuples, any ordering, such as required to represent a relation in two-dimenstional space as a table, is completely arbitrary. Note that the following two relations are two representations of *same* relation:
@@ -311,7 +342,7 @@ Note that in the above operator examples, the order of the tuples appears to shi
311342|Sam|41|
312343|Cindy|42|
313344
314−and
345+and
315346
316347|(Name, Name Type)|(Age, Age Type)|
317348|-----------------|---------------|
@@ -343,11 +374,11 @@ For most companies, its data, such as customer, employee, sales, and product inf
343374
344375## What is the advantage of having relation-valued attributes?
345376
346−Since a value can store any (immutable) type, it can certainly hold a relation. At the very least, the mathematics does not exclude the possibility. This does create a recursively-defined data structure (Relation -> Tuple -> Value -> Relation), but it turns out that relations as values can be quite useful.
377+Since a value can store any (immutable) type, it can certainly hold a relation. At the very least, the mathematics does not exclude the possibility. This does create a recursively-defined data structure (Relation -> Tuple -> Value -> Relation), but it turns out that relations as values can be quite useful.
347378
348379For example, in SQL, if one wants to collect some aggregate data over some tuples while still returning the individual tuples, in the best case, the aggregate information must be repeated for every individual tuple. In the worst case, two separate queries are required since nested tables are not supported.
349380
350−In the relational algebra, The aggregate value can be placed alongside the relation value from whic the aggregate was derived.
381+In the relational algebra, The aggregate value can be placed alongside the relation value from which the aggregate was derived.
351382
352383Example:
353384
@@ -372,7 +403,7 @@ Example:
372403
373404## Suggested Reading
374405
375−Chris Date has been researching the relational model and its consequences for over forty years. Date has published his findings in various papers but also summarizes his work in a series of introductory and advanced books. Date freely admits that his work on the relational algebra has been corrected over time, so it is best to read his latest works.
406+Chris Date has been researching the relational model and its consequences for over forty years. Date has published his findings in various papers but also summarizes his work in a series of introductory and advanced books. Date freely admits that his work on the relational algebra has been corrected over time, so it is best to read his latest works.
376407
377408Despite that fact that modern SQL databases do not adhere to the principles of relational algebra doesn't mean that the principles cannot be applied. Date often discusses and compares SQL constructions with his own "TutorialD" language. Project:M36 also supports TutorialD.
378409
docs/isomorphic_schemas.markdownnew file+176
@@ -0,0 +1,176 @@
1+# Project:M36 Isomorphic Schemas
2+
3+## Introduction
4+
5+Project:M36 implements a unique feature called "isomorphic schemas" which allow database users to create any number of additional schemas which are completely isomorphic to the original schema.
6+
7+Two schemas which are isomorphic can have different structure, such as different relation variables, but actually represent identical information. This means that both schemas contain the same data, but the database structures such as relations are defined distinctly and in such a way as to make the schemas serve potentially different purposes. Tautologically, two schemas which are identical are isomorphic to each other.
8+
9+## Towards Solving Action-at-a-Distance
10+
11+Isomorphic schemas were designed to handle the use-case commonly covered by SQL views. SQL views allow a database user to create named SQL macros in a database schema. With many caveats, these macros can also be made "updateable", i.e. views can be the table targets of UPDATE, INSERT, or DELETE expressions.
12+
13+Chris Date elucidates on the numerous caveats involved in updateable SQL views in his "View Updating & Relational Theory" book. Of specific importance is the violation of the "Principle of Orthogonal Design" which states that two relation variables in a database should not represent the same data. Using SQL views as tables clearly violates this principle since a view can only create a duplicate view of the existing data. This same principle is violated even with materialized views.
14+
15+Furthermore, SQL views violate the "Principle of Interchangeability" because of the special nature of views. Whether views are updateable or not is at the discretion of the database user. Some SQL views are proveably not updateable such as with summary or report views which intentionally collate data. Therefore, views do not behave identically to tables/relation variables.
16+
17+SQL views violate "The Information Principle" because they represent variable storage which may behave outside the realm of what a table/relation variable could accomplish. A simple example is an SQL view which does *not* change the database state on an UPDATE (ON UPDATE DO NOTHING). A more complex example could involve a one-way hash function against database values which would be impossible to invert and thus prevent a logical update.
18+
19+Updateable SQL views necessarily allow for "action at-a-distance", i.e. when a view is updated, an unknown number of actual tables may be altered in unanticipatable ways.
20+
21+Isomorphic schemas were designed to address these violations with a mathematically-coherent design.
22+
23+## Definition
24+
25+Given a schema A containing relation variables, a given schema B is isomorphic to schema A if-and-only-if all relational expressions which can be written against schema B can be mechanically transformed to perform an operation on schema A which returns the same result relation.
26+
27+## The Use Case
28+
29+Despite their flaws, SQL views are useful for several reasons:
30+
31+ * as an SQL macro language to store commonly-used queries
32+ * as a means of hiding schema complexity; a set of views can be used to aggregate data across many tables, for example, to denormalize a set of table data
33+ * as a means to contain different access methods to the database as the database evoles, i.e. the database schema needs to be altered, but the old access strategies can be emulated through views
34+ * as a means of enforcing security access by implementing views which offer a restricted subset of the original data
35+
36+Of these use cases, isomorphic schemas only cover the schema complexity and database evolution use cases. Further research (see Conclusion) may be able to extend this design to the missing use cases.
37+
38+## Isomorphic Schema Building Blocks
39+
40+Project:M36 does not purport to be able to represent all possible isomorphic schemas, rather Project:M36 includes a set of "building blocks" from which one can create isomorphic schemas. These building blocks represent transformations needed to shift contexts from one schema to another. Currently, the building blocks are:
41+
42+* rename: a relation variable in schema A may have a different name in schema B
43+* restrict: a relation variable in schema A can be split into two relation variables in schema B given a restriction predicate
44+* union: two relation variables in schema A can be union'd and represent one
45+
46+Note that the restrict and union building blocks are inverse operations to each other.
47+
48+Clearly, there are additional limitations placed on the relation variables that can be used in the building blocks; for example, for two relations to be union-able, they must have the same header and no tuple overlap.
49+
50+## Isomorphic Schemas in Practice
51+
52+Project:M36 is the first DBMS to implement isomorphic schemas. By default, each transaction is given a special "main" schema which cannot be deleted. To create a new isomorphic schema, use the "addschema" command:
53+
54+```
55+:addschema <schema name> (<isomorphic building block>,...)
56+```
57+
58+where the building blocks are one of:
59+
60+* ```isorestrict "<new schema relvar name>" "<existing schema rel var where predicate is true>" "<existing schema rel var where predicate is false>" <predicate>```
61+* ```isounion "<new schema relvar name where predicate is true>" "<new schema relvar name where predicate is false>" "<existing schema relvar name>" <predicate>```
62+* ```isorename "<new schema relvar name>" "<existing schema relvar name>"```
63+* ```isopassthrough "<relvar name to retain in both existing and new schemas>"```
64+
65+This list of building blocks is merely what Project:M36 supports and is not meant to represent an exhaustive list of potential, mathematically-sound isomorphisms.
66+
67+To switch to an alternative schema, use the ```:setschema``` command:
68+
69+```:setschema <schema name>```
70+
71+To delete a schema, use the ```:removeschema``` command:
72+
73+```:removeschema <schema name>```
74+
75+The special "main" schema cannot be deleted.
76+
77+Full example:
78+```
79+TutorialD (master/main): x1:=relation{tuple{y 3}, tuple{y 4}}
80+TutorialD (master/main): x2:=relation{tuple{y 5}, tuple{y 6}}
81+TutorialD (master/main): :addschema spam (isorestrict "x" "x1" "x2" ^lt(@y,5), isopassthrough "true", isopassthrough "false")
82+TutorialD (master/main): :setschema spam
83+TutorialD (master/spam): :showexpr x
84+┌──────────────┐
85+│y::IntAtomType│
86+├──────────────┤
87+│4 │
88+│5 │
89+│3 │
90+│6 │
91+└──────────────┘
92+TutorialD (master/spam): :showrelvars
93+┌─────────────────────────────────────────────────────────────────┬──────────────────┐
94+│attributes::relation {attribute::TextAtomType,type::TextAtomType}│name::TextAtomType│
95+├─────────────────────────────────────────────────────────────────┼──────────────────┤
96+│┌───────────────────────┬──────────────────┐ │"true" │
97+││attribute::TextAtomType│type::TextAtomType│ │ │
98+│└───────────────────────┴──────────────────┘ │ │
99+│┌───────────────────────┬──────────────────┐ │"false" │
100+││attribute::TextAtomType│type::TextAtomType│ │ │
101+│└───────────────────────┴──────────────────┘ │ │
102+│┌───────────────────────┬──────────────────┐ │"x" │
103+││attribute::TextAtomType│type::TextAtomType│ │ │
104+│├───────────────────────┼──────────────────┤ │ │
105+││"y" │"IntAtomType" │ │ │
106+│└───────────────────────┴──────────────────┘ │ │
107+└─────────────────────────────────────────────────────────────────┴──────────────────┘
108+TutorialD (master/spam): :setschema main
109+TutorialD (master/main): :showrelvars
110+┌─────────────────────────────────────────────────────────────────┬──────────────────┐
111+│attributes::relation {attribute::TextAtomType,type::TextAtomType}│name::TextAtomType│
112+├─────────────────────────────────────────────────────────────────┼──────────────────┤
113+│┌───────────────────────┬──────────────────┐ │"true" │
114+││attribute::TextAtomType│type::TextAtomType│ │ │
115+│└───────────────────────┴──────────────────┘ │ │
116+│┌───────────────────────┬──────────────────┐ │"x1" │
117+││attribute::TextAtomType│type::TextAtomType│ │ │
118+│├───────────────────────┼──────────────────┤ │ │
119+││"y" │"IntAtomType" │ │ │
120+│└───────────────────────┴──────────────────┘ │ │
121+│┌───────────────────────┬──────────────────┐ │"false" │
122+││attribute::TextAtomType│type::TextAtomType│ │ │
123+│└───────────────────────┴──────────────────┘ │ │
124+│┌───────────────────────┬──────────────────┐ │"x2" │
125+││attribute::TextAtomType│type::TextAtomType│ │ │
126+│├───────────────────────┼──────────────────┤ │ │
127+││"y" │"IntAtomType" │ │ │
128+│└───────────────────────┴──────────────────┘ │ │
129+└─────────────────────────────────────────────────────────────────┴──────────────────┘
130+```
131+
132+Note that for schema to be isomorphic, each relation variable in the existing schema must be referenced in the building blocks, otherwise an error is thrown which prevents the creation of a non-isomorphic schema.
133+
134+If not all relation variables were referenced in the proposed isomorphism, then the schema cannot be isomorphic. Consider a schema with two relation variables, ```A``` and ```B``` and a foreign key constraint ```X``` between them. If a new schema were to be created with only ```A``` appearing, given an insert to ```A``` which violates the constraint ```X```, it would be possible to issue an insert to ```A``` which would violate a constraint on a relation variable which does not appear to exist. Therefore, such a schema would be not be isomorphic and the schema would violate the both the Closed World Assumption and the Principle of Interchangeability.
135+
136+While it would be possible to create sub-isomorphic schemas mentioning a subset of all relation variables which do not have constraints between them, this has not been implemented because most schemas typically have constraints linking all relation variables together. This could be an area of further research.
137+
138+## More on Use Cases
139+
140+Instead of SQL views which model individual relation variables, by taking the notion of a "view" to a higher level in the database structure hierarchy, we find a "view" into a given database context can be represented as an isomorphic schema.
141+
142+Isomorphic schemas can be used in lieu of views to offer different APIs to an existing database, potentially supporting legacy interfaces while allowing the database schema to evolve further.
143+
144+Because it is not possible to query across schemas in one query (only one schema is under consideration at-a-time), the Principle of Orthogonal Design is not violated.
145+
146+## Conclusion
147+
148+The existence of isomorphic schemas underscores the need for DBMSes to embrace data independence which can allow for relation variables to be sliced to suit the needs of a application without violating the relational algebra's basic principles.
149+
150+Because the schemas are isomorphic, any derived, isomorphic schema could be used to assist in an on-disk, optimal representation instead of the schema which a user happened to type in first.
151+
152+Project:M36 is the first DBMS to propose and implement isomorphic schemas.
153+
154+Further research into isomorphic schemas could include:
155+
156+* methods to determine which persistent data representation represented as a schema would be optimal for a given set of input queries against the data.
157+* restricted access sub-schemas which emulate the functionality of SQL views used for security
158+* additional isomorphic building blocks such as
159+ * type constructor isomorphisms
160+ * atom function isomorphisms
161+ * project/extend isomorphisms
162+ * join isomorphisms
163+
164+Many of the additional isomorphisms are mentioned in Date's "View Updating & Relational Theory" book but not named as such.
165+
166+Project:M36 will continue to be developed in order to implement additional isomorphisms. We offer no proof that *every* isomorphic schema can be represented by these building blocks, but, hopefully, the blocks can be used to build the most interesting/useful schemas.
167+
168+### Bibliography
169+
170+Date, C.J. "View Updating & Relational Theory: Solving the View Update Problem". O'Reilly Media, Inc. 2013.
171+
172+Date, C.J. "Database Design & Relational Theory: Normal Forms and All That Jazz". O'Reilly Media, Inc. 2012.
173+
174+### Sponsors and Contributors
175+
176+The funding covering the research and implementation of isomorphic schemas was generously provided by E.E.P.R grant #28557448. This work would not have been possible without discussions with Dr. G. Garbés, Ph.D.
docs/javascript_driver.markdownnew file+21
@@ -0,0 +1,21 @@
1+# Project:M36 JavaScript Driver
2+
3+## Introduction
4+
5+ The JavaScript database driver for Project:M36 is a fully-featured database driver for the Project:M36 Relational Algebra Engine DBMS. The driver's only dependency is a working websockets implementation which is provided by virtually any modern web browser and node.js. The API is callback-based.
6+
7+ ## Usage
8+
9+1. [Download the driver](/src/bin/ProjectM36/Websocket/project-m36.js).
10+1. Connect to the websocket server with a ```new ProjectM36Connection(..)``` including the asynchronous callback functions.
11+1. When the ```openCallback``` is called, the database is ready to execute TutorialD sing the ```executeTutorialD()``` function.
12+1. Implement ```statusCallback``` to update your user interface for expected and asynchronous event handling.
13+
14+## Example
15+
16+A fully-functioning interactive websocket client is available:
17+
18+* [websocket-client.html](/src/bin/ProjectM36/Server/WebSocket/websocket-client.html)
19+* [websocket-client.js](/src/bin/ProjectM36/Server/WebSocket/websocket-client.js)
20+
21+This example also powers [try.project-m36.io](https://try.project-m36.io).
docs/jupyter_kernel.markdownnew file+49
@@ -0,0 +1,49 @@
1+# TutorialD Jupyter Kernel for Project:M36
2+
3+## Introduction
4+
5+[The Jupyter Notebook](https://jupyter-notebook.readthedocs.io/en/stable/notebook.html) is web-based tool for experimenting with various languages. Project:M36 offers a Jupyter kernel for the TutorialD interpreter.
6+
7+The kernel automatically starts and stops its own websocket-server-based database and offers no filesystem persistence, which is similar to other jupyter kernels.
8+
9+## Installation
10+
11+To install the `tutd` kernel:
12+
13+* install the `itutd` module into your jupyter virtual environment:
14+```
15+$ cd project-m36/jupyter/itutd
16+$ pip install .
17+```
18+
19+* install `kernel.json`:
20+
21+ ```$ mkdir ~/Library/Jupyter/kernels/itutd && cp project-m36/jupyter/kernel.json ~/Library/Jupyter/kernels/itutd``` (macOS)
22+
23+ ```$ mkdir ~/.local/share/jupyter/kernels/tutd && cp project-m36/jupyter/kernel.json ~/.local/share/jupyter/kernels/tutd``` (Linux)
24+
25+ ```$ mkdir %APPDATA%\jupyter\kernels\tutd && copy project-m36\jupyter\kernel.json %APPDATA%\jupyter\kernels\tutd``` (Windows)
26+
27+* check that the kernel is detected:
28+```
29+$ jupyter kernelspec list
30+Available kernels:
31+ python2 ...
32+ tutd ...
33+```
34+
35+* add `project-m36-server` to `PATH` environment variable
36+
37+```
38+$ export PATH=$PATH:<path/to/project-m36-websocket-server>
39+$ which project-m36-websocket-server
40+/path/to/project-m36-websocket-server
41+```
42+
43+From within this python virtual environment, you can now start jupyter with TutorialD support.
44+
45+## Usage
46+
47+With the kernel installed, run `jupyter notebook` for the web-based interface and click "New" at the top right of the page. The TutorialD kernel should be in the list.
48+
49+Once a new TutorialD notebook is opened, the interpreter is identical to the `tutd` command line interpreter and accepts the same commands. If you are new to Project:M36-flavored TutorialD, please [read the tutorial](/docs/tutd_tutorial.markdown).
docs/merge_transactions.markdown+8−8
@@ -58,7 +58,7 @@ Branching and merging are built-in to the Project:M36 ```tutd``` client.
5858
5959First, let's create a new branch for some new sales data.
6060```
61−TutorialD (master): :branch add_sales_feature
61+TutorialD (master/main): :branch add_sales_feature
6262TutorialD (add_sales_feature):
6363```
6464
@@ -82,15 +82,15 @@ Now, the relation variable "sales" is available on the "add_sales_feature" branc
8282
8383```
8484TutorialD (add_sales_feature): :jumphead master
85−TutorialD (master): :showexpr sales
85+TutorialD (master/main): :showexpr sales
8686ERR: RelVarNotDefinedError "sales"
8787```
8888
8989Now that we are on the "master" branch, let's add a relation variables unrelated to sales.
9090
9191```
92−TutorialD (master): employees := relation{tuple{name "Steve"},tuple{name "Cindy"}}
93−TutorialD (master): :commit
92+TutorialD (master/main): employees := relation{tuple{name "Steve"},tuple{name "Cindy"}}
93+TutorialD (master/main): :commit
9494```
9595
9696Note that the "employees" relation variable is only available on the "master" branch and not on the "add_sales_feature" branch.
@@ -98,7 +98,7 @@ Note that the "employees" relation variable is only available on the "master" br
9898Let's look at the transaction graph:
9999
100100```
101−TutorialD (master): :showgraph
101+TutorialD (master/main): :showgraph
102102┌─────────────┬───────────────────┬──────────────────────────────────────┬────────────────────────────────────────┐
103103│current::Bool│head::Text │id::Text │parents::relation {id::Text} │
104104├─────────────┼───────────────────┼──────────────────────────────────────┼────────────────────────────────────────┤
@@ -129,15 +129,15 @@ TutorialD (master): :showgraph
129129Now, imagine that the work on the "add_sales_merge" branch is complete, so we will merge the "add_sales_feature" branch back into the "master" branch. We say we are merging "back" because both branches share a common ancestor transaction.
130130
131131```
132−TutorialD (master): :mergetrans union add_sales_feature master
133−TutorialD (master): :showexpr employees
132+TutorialD (master/main): :mergetrans union add_sales_feature master
133+TutorialD (master/main): :showexpr employees
134134┌──────────┐
135135│name::Text│
136136├──────────┤
137137│"Steve" │
138138│"Cindy" │
139139└──────────┘
140−TutorialD (master): :showexpr sales
140+TutorialD (master/main): :showexpr sales
141141┌───────────┬─────────────┐
142142│amount::Int│product::Text│
143143├───────────┼─────────────┤
docs/merkle_transaction_graph.markdownnew file+33
@@ -0,0 +1,33 @@
1+# Project:M36: Merkle Hashing for Transaction Graph
2+
3+## Introduction
4+
5+Project:M36 supports an append-only transaction graph model (similar to git) whereby new transactions can be added to the graph but not removed. As with any graph, each node can contain a Merkle hash which ensures not only that it's state since being added to the graph has not changed but also that none of its parent nodes all the way to the root node (initial state) have not been modified. This validation has a number of use cases.
6+
7+## Usage
8+
9+Project:M36 automatically adds Merkle hashes to every transaction. All data which represents the database state at that transaction is included in the hash including (but not limited to) relation variable definitions, atom and database context functions, constraints, and types.
10+
11+Project:M36 validates all merkle hashes at database startup. For users who need validation after the database is started, the user can issue `:validatemerklehashes` at the `tutd` command line.
12+
13+### Audit Logging
14+
15+Project:M36 supports audit logging by allowing users to travel to transactions in the past and recreate the database state at that past point-in-time. To ensure that those past states cannot be modified either by malicious on-disk or in-memory changes, each transaction is protected by its own Merkle hash. If the calculated hash does not match the stored hash, Project:M36 can immediately report which transaction triggered the tamper-proof log.
16+
17+### Reproducibility
18+
19+Since a Merkle tree is effectively immutable except to add more nodes, it can be used to save and restore a whole database with very high confidence in the results. This feature could also be used to restore a database partially; for example, to duplicate just the latest database state on a second machine for OLAP analysis.
20+
21+### High-Availability
22+
23+Merkle tree hashes can be used to assert database integrity across high-availibility or database replication. Since the hash covers all database state, it can be used to validate log-shipping-based replication. Corrupted cache tuple data can be easily detected and flushed.
24+
25+## Merkle Hashes in Other DBMSes
26+
27+While Merkle hashes have become prevalent in blockchain-style databases, they have not made many appearances in typical SQL databases. This is likely due to the fact that such databases consider any additional operations against the large tuple stores as prohibitively expensive. Project:M36 is able to skirt this cost by only hashing database update expressions rather than the result of these executed expressions. This also means that the Merkle hash can be computed against transactions which have been created but never executed.
28+
29+## Conclusion
30+
31+Merkle hashes are an obvious improvement to any graph-based transaction log and are a low-cost method of ensuring data integrity.
32+
33+A further improvement could allow users to specify an initial key provided by an admin user to salt the hash used to create the database. Additionally, a multi-user system could allow individual users to sign their committed transactions. The signature would then be included in the Merkle hash.
docs/new_datatypes.markdown+70−10
@@ -8,13 +8,15 @@ In addition, the Project:M36 runtime supports algebraic data types in the same v
88
99Project:M36 makes it easy to add any Haskell data type to the database. Any type which includes instances for a set of typeclasses can be supported.
1010
11+For storing Haskell record types as database tuples, see "[Converting data types to tuples](/docs/tupleable.markdown)."
12+
1113## Support for Runtime Types
1214
1315Use the ```tutd``` interpreter to create new type and data constructors with essentially the same syntax as in Haskell:
1416
1517```
16−TutorialD (master): data Hair = Bald | Brown | Blond | OtherColor Text
17−TutorialD (master): :showexpr relation{tuple{name "Steve", hair Blond}, tuple{name "Sam", hair OtherColor "Grey"}}
18+TutorialD (master/main): data Hair = Bald | Brown | Blond | OtherColor Text
19+TutorialD (master/main): :showexpr relation{tuple{name "Steve", hair Blond}, tuple{name "Sam", hair OtherColor "Grey"}}
1820┌─────────────────┬──────────┐
1921│hair::Hair │name::Text│
2022├─────────────────┼──────────┤
@@ -28,7 +30,7 @@ SQL's enumerations or even joins do not compare favorably to a genuine algebraic
2830Types can be forgotten as well:
2931
3032```
31−TutorialD (master): undata Hair
33+TutorialD (master/main): undata Hair
3234```
3335
3436These runtime types can therefore change between transactions. Note that the underlying data values do not change when the types change. Once changed, only new values will reflect the new data constructors.
@@ -39,13 +41,71 @@ Note that the Haskell-standard "Maybe a" and "Either a b" data types are include
3941
4042## Support for Haskell Types
4143
42−Any Haskell data type which is an instance of ```Atomable``` is a candidate for a Project:M36 value called an ```Atom```. Database tuples are composed of Atoms.
43−
44−Project:M36 does not yet support dynamically-loaded components, so the data type must be compiled into the Project:M36 backend.
44+New algebraic data types can be added to the database context at any time via TutorialD or Haskell. Typeclasses for database types are not supported.
4545
4646### Implementation for Haskell Types
4747
48−1. Create an instance of your data type for the ```Atomable``` typeclass. The ```Atomable``` typeclass implies instances for a variety of standard typeclasses.
49−1. Update the ```Binary Atom``` instance to include deserialization for your type.
50−1. Update the ```makeAtomFromText``` in ```ProjectM36/Atom.hs``` to support CSV import.
51−1. Optionally adjust ```TutorialD/Interpreter/RelationalExpression.hs``` to add support for parsing your data type in the TutorialD interpreter. Look for ```atomP```.
48+Any Haskell ADT which implements the ```Atomable``` typeclass can be used directly as a database value or "atom" in Project:M36 parlance. The ```Atomable``` typeclass requires a set of prerequisite typeclasses be included, but, luckily, all of these typeclasses can be derived.
49+
50+Let's implement the ```Hair``` algebraic data type from the TutorialD example, but in Haskell. The full source code is available under the [examples directory](/examples/hair.hs).
51+
52+First, we define our data type and derive all the required typeclasses:
53+
54+```haskell
55+data Hair = Bald | Brown | Blond | OtherColor Text
56+ deriving (Generic, Show, Eq, Binary, NFData, Atomable)
57+```
58+
59+Note that the ```Atomable``` instance can also be derived.
60+
61+After setting up the connection (which we elide here), the database context is loaded with the expression to define the data type.
62+
63+```haskell
64+executeDatabaseContextExpr sessionId conn (toAddTypeExpr (undefined :: Hair))
65+```
66+
67+Using a ```Proxy``` would also be acceptable, but the result would be the same.
68+
69+Next, we can create a relation variable named "people" containing our new data type alongside a person's name.
70+
71+```haskell
72+ let blond = NakedAtomExpr (toAtom Blond)
73+ executeDatabaseContextExpr sessionId conn (Assign "people" (MakeRelationFromExprs Nothing [
74+ TupleExpr (M.fromList [("hair", blond), ("name", NakedAtomExpr (TextAtom "Colin"))])]))
75+```
76+
77+To demonstrate that the new value is fully integrated with the database, we can create a restriction which matches against the value in the database.
78+
79+```haskell
80+let restrictionPredicate = AttributeEqualityPredicate "hair" blond
81+peopleRelOrErr <- executeRelationalExpr sessionId conn (Restrict restrictionPredicate (RelationVariable "people" ()))
82+```
83+
84+Finally, we can print the resultant relation to show that it can be properly displayed (via the type's ```Show``` instance).
85+
86+```
87+TIO.putStrLn (showRelation peopleRel)
88+```
89+
90+```
91+┌──────────┬──────────┐
92+│hair::Hair│name::Text│
93+├──────────┼──────────┤
94+│Blond │"Colin" │
95+└──────────┴──────────┘
96+```
97+
98+Note here that ```Blond``` is not quoted because it is not a text value, but rather a real algebraic data type constructor honored by the database. The value is not a black box nor is an enumeration. Try, for example, replacing the ```Blond``` value with an ```OtherColor "Black"``` value to see how it appears and how it can be restricted against as well.
99+
100+The essential ```Atomable``` typeclass functions are:
101+
102+| Function | Purpose |
103+| -------- | ------- |
104+| ```toAtom :: a -> Atom``` | convert a Haskell data type to a database atom |
105+| ```fromAtom :: Atom -> a``` | convert a database atom to a Haskell data type |
106+| ```toAtomType :: Proxy a -> AtomType``` | generate a database AtomType for a Haskell datatype |
107+| ```toAddTypeExpr :: Proxy a -> DatabaseContextExpr``` | generate a ```DatabaseContextExpr``` which can be executed against a database context in order to add the new type |
108+
109+In addition, basic Haskell data types like ```Int```, ```Double```, ```Text```, ```Day```, ```Bool```, ```UTCTime```, and ```ByteString``` already have `Atomable` instances ready-to-go. In addition, an ```Atomable``` instance is available for lists: ```Atomable a => [a]```, though one should be very careful not to use this in a common anti-pattern. Typically, it makes more sense to store one-to-many relationships as discrete relation variables; when storing them as lists, one gives up the various query capabilities and optimizations of the relational algebra.
110+
111+To be clear, these data types are not black boxes once stored in the database. These new types can be scanned and manipulated by Haskell scripts which can be created at runtime. For more information, read about [```AtomFunction```s](/docs/atomfunctions.markdown).
docs/on_null.markdown+5−5
@@ -345,10 +345,10 @@ But all we have really done is add even more NULLs. Retrieving a sensible value
345345## Runtime Types
346346
347347Project:M36 supports management of new algebraic data types at runtime. These types are associated with transactions and can changed over time whereas primitive Atoms cannot be changed.
348−d
348+
349349```
350−TutorialD (master): data Age = PreciseAge Int | ForgotToAsk | RefusedToDisclose | NotApplicable | ApproximateAge Int Int
351−TutorialD (master): :showexpr relation{tuple{name "Steve", age ApproximateAge 20 30}, tuple{name "Bob", age RefusedToDisclose}, tuple {name "Initech Corp.", age NotApplicable}}
350+TutorialD (master/main): data Age = PreciseAge Int | ForgotToAsk | RefusedToDisclose | NotApplicable | ApproximateAge Int Int
351+TutorialD (master/main): :showexpr relation{tuple{name "Steve", age ApproximateAge 20 30}, tuple{name "Bob", age RefusedToDisclose}, tuple {name "Initech Corp.", age NotApplicable}}
352352┌────────────────────┬───────────────┐
353353│age::Age │name::Text │
354354├────────────────────┼───────────────┤
@@ -361,8 +361,8 @@ TutorialD (master): :showexpr relation{tuple{name "Steve", age ApproximateAge 20
361361Note that the two values which would normally be rendered as NULL in SQL are indeed proper values and can be distinguished. Three-valued logic makes no appearance. The type constructors can also have arguments:
362362
363363```
364−TutorialD (master): data Tree a = Node a (Tree a) (Tree a) | EmptyNode
365−TutorialD (master): :showexpr relation{tuple{family "Stevenson", familytree Node "Jim" (Node "Cindy" EmptyNode EmptyNode) (Node "Mike" EmptyNode EmptyNode)}}
364+TutorialD (master/main): data Tree a = Node a (Tree a) (Tree a) | EmptyNode
365+TutorialD (master/main): :showexpr relation{tuple{family "Stevenson", familytree Node "Jim" (Node "Cindy" EmptyNode EmptyNode) (Node "Mike" EmptyNode EmptyNode)}}
366366┌────────────┬───────────────────────────────────────────────────────────────────────────────┐
367367│family::Text│familytree::Tree (a::Text) │
368368├────────────┼───────────────────────────────────────────────────────────────────────────────┤
docs/persistent_library_driver.markdowndeleted−18
@@ -1,18 +0,0 @@
1−# Project:M36 Persistent Library Driver
2−
3−Project:M36 includes a driver for the [persistent](https://hackage.haskell.org/package/persistent) library which offers lowest-common-denominator DBMS support for storing and retrieving Haskell-based datatypes. While the persistent library does not support every Project:M36 feature, it can nonetheless be handy for simple use-cases and database-agnostic mapping.
4−
5−For the most part, using the Project:M36 driver should be identical to using other drivers.
6−
7−## Setup
8−
9−Use ```withProjectM36Conn``` with a configuration argument to add a ReaderT to your monad stack. The, follow that with ```runProjectM36Conn``` to run the monad.
10−
11−## Usage
12−
13−At this point, all persistent functions are available. The driver always commits to the "master" branch.
14−
15−## Caveats
16−
17−* Not every persistent data type is supported yet.
18−* Tuple ordering in selects is not yet supported.
docs/projectm36_client_library.markdown+15−1
@@ -2,6 +2,8 @@
22
33The Project:M36 client library is the preferred method for interacting with Project:M36 databases. It supports all features of the DBMS while other interfaces may not.
44
5+**Note:** A less featureful but more convenient client API also is available: see [documentation](simple_api.markdown).
6+
57The client supports both in-process and remote Project:M36 access.
68
79## Setup
@@ -10,7 +12,7 @@ The client supports both in-process and remote Project:M36 access.
1012```haskell
1113import ProjectM36.Client
1214```
13−2. Create a Connection with a ConnectionInfo in the Either monad
15+2. Create a Connection with a `ConnectionInfo` in the Either monad
1416```haskell
1517conn <- connectProjectM36 (InProcessConnectionInfo NoPersistence)
1618```
@@ -30,6 +32,18 @@ maybeErr <- executeDatabaseContextExpr conn (Define "person" (attributesFromList
3032maybeErr <- executeGraphExpr conn (JumpToHead "branch2")
3133```
3234
35+## Dealing with Concurrency
36+
37+As in all databases, transactions contend concurrently for access to the the latest database state. Unlike most DBMSs, Project:M36 features multiple heads to reduce contention. Still, at a high transaction rate, Project:M36 clients would still be likely to receive lots of ```TransactionIsNotAHeadError```s because the server's head has received additional commits by the time a client wants to commit its own transaction. To reduce the incidence of this error, the server offers an ```autoMergeToHead``` function which:
38+
39+1. creates a temporary branch
40+1. commits the current disconnected transaction to the temporary branch
41+1. attempts a merge back to the original branch
42+
43+The operations above occur atomically on the server. The purpose of this "automerge" is to reduce reliance on repeated client attempts to commit when head contention is high. The trade-off is that the client must handle any merge errors or use a different merge strategy.
44+
45+This feature is similar to git's ```rebase``` functionality except that the merge occurs server side and is fully validated and committed, if possible.
46+
3347## Cleanup
3448
35491. Close the connection
docs/reaching_out_of_the_tarpit.markdown+8−9
@@ -2,11 +2,11 @@
22
33## Introduction
44
5−[Project:M36](https://github.com/agentm/project-m36) is a relational algebra database management system (RDBMS) written in the Haskell programming language whose purpose is to implement the foundation for functional relational programming as described in the excellent paper ["Out of the Tarpit"](http://shaffner.us/cs/papers/tarpit.pdf). This document describes how Project:M36 meets the design goals laid out in the paper.
5+[Project:M36](https://github.com/agentm/project-m36) is a relational algebra database management system (RDBMS) written in the Haskell programming language whose purpose is to implement the foundation for functional relational programming as described in the excellent paper ["Out of the Tarpit"](https://github.com/papers-we-love/papers-we-love/blob/2eb8d21/design/out-of-the-tar-pit.pdf). This document describes how Project:M36 meets the design goals laid out in the paper.
66
77## Why is "Out of the Tarpit" Important?
88
9−The "Out of the Tarpit" paper, written in 2006, consolidates decades of software development research and experience to explain why software written today is chock-full of software bugs. The paper categorizes sources of complexity and then proceeds to propose a software architecture which promises to reduce unnecessary software complexity so that the resultant software is maximally focused on actual business rules. It is recommended to read [the paper](http://shaffner.us/cs/papers/tarpit.pdf) before reading the remainder of this document.
9+The "Out of the Tarpit" paper, written in 2006, consolidates decades of software development research and experience to explain why software written today is chock-full of software bugs. The paper categorizes sources of complexity and then proceeds to propose a software architecture which promises to reduce unnecessary software complexity so that the resultant software is maximally focused on actual business rules. It is recommended to read [the paper](https://github.com/papers-we-love/papers-we-love/blob/2eb8d21/design/out-of-the-tar-pit.pdf) before reading the remainder of this document.
1010
1111## Laying the Foundations for Reduced Complexity
1212
@@ -21,14 +21,14 @@ The central software component of functional-relational programming is a relatio
2121* **declarative**: thus removing accidental complexity (such as accidental ordering)
2222* **restricted**: removing mistaken features; if a programming language allows a programmer to do something less-than-savory, then that misfeature will be used
2323
24−and provides ([p.37](http://shaffner.us/cs/papers/tarpit.pdf)):
24+and provides ([p.37](https://github.com/papers-we-love/papers-we-love/blob/2eb8d21/design/out-of-the-tar-pit.pdf)):
2525
2626* **structure**: a closed world system whereby all data is represented by relations
2727* **manipulation**: a means to simulate mutation of the application state over time
2828* **data integrity**: constraints which prevent illogical data constructions
2929* **data independence**: logical and physical representations of state which are clearly separated
3030
31−The relational model is a mathematical model for storing and manipulating "essential state" ([p.25](http://shaffner.us/cs/papers/tarpit.pdf)). As a mathematical model, it not beholden to any specific implementation or quirks.
31+The relational model is a mathematical model for storing and manipulating "essential state" ([p.25](https://github.com/papers-we-love/papers-we-love/blob/2eb8d21/design/out-of-the-tar-pit.pdf)). As a mathematical model, it not beholden to any specific implementation or quirks.
3232
3333Unfortunately, due to the quirks of legacy implementations, much of what developers learn about the relational model is [wrong](/docs/on_null.markdown). Project:M36 aims to rectify this situation by providing a mathematically coherent implementation of the relational model. Contrast the mathematical approach to existing databases which sacrifice or elide a mathematical model in lieu of "performance". Refer to [Knuth on premature optimization](https://en.wikiquote.org/wiki/Donald_Knuth) for additional details.
3434
@@ -51,15 +51,14 @@ Project:M36 implements multiple interfaces:
5151
5252* an interactive console implementing [TutorialD](https://en.wikipedia.org/wiki/D_%28data_language_specification%29), a small language for learning about the relational algebra
5353* a native Haskell API
54−* a database driver for the [persistent framework](http://www.yesodweb.com/book/persistent)
5554
5655### Real Estate Database Example
5756
5857To understand how Project:M36 stacks up against the fictional programming language shown in the paper, we have implemented the [example from the paper](/examples/out_of_the_tarpit.tutd). The language used in the script is a dialect of Chris Date's TutorialD language. It can be loaded into an interactive ```tutd``` session like so:
5958
6059```
61−TutorialD (master): :importexample date
62−TutorialD (master): :showexpr p
60+TutorialD (master/main): :importexample cjdate
61+TutorialD (master/main): :showexpr p
6362┌───────────────────┬────────────┬───────────────────┬────────────┬────────────┐
6463│address::Address │agent::Agent│dateRegistered::Day│photo::Text │price::Price│
6564├───────────────────┼────────────┼───────────────────┼────────────┼────────────┤
@@ -71,7 +70,7 @@ TutorialD (master): :showexpr p
7170
7271### Infrastructure Requirements
7372
74−Project:M36 meets or exceeds the enumerated "Infrastructure" ([p.47](http://shaffner.us/cs/papers/tarpit.pdf)) requirements (except one):
73+Project:M36 meets or exceeds the enumerated "Infrastructure" ([p.47](https://github.com/papers-we-love/papers-we-love/blob/2eb8d21/design/out-of-the-tar-pit.pdf)) requirements (except one):
7574
7675* **Infrastructure for Essential State**: relation variable manipulation, storage, and data types
7776* **Infrastructure for Essential Logic**: relational expression evaluation, functions to operate on values, a language (TutorialD or Haskell), type inference, and constraints
@@ -83,7 +82,7 @@ Derived relations, as described in the paper, are not supported in Project:M36 b
8382
8483### Feeders and Observers
8584
86−The "Out of the Tarpit" paper distinguishes between pushing data to the database and pulling data out of the database ([p.46](http://shaffner.us/cs/papers/tarpit.pdf)): "feeders" continually update the state of the database to best reflect reality and "observers" request notifications on relational state changes and take action on them.
85+The "Out of the Tarpit" paper distinguishes between pushing data to the database and pulling data out of the database ([p.46](https://github.com/papers-we-love/papers-we-love/blob/2eb8d21/design/out-of-the-tar-pit.pdf)): "feeders" continually update the state of the database to best reflect reality and "observers" request notifications on relational state changes and take action on them.
8786
8887SQL developers are already intimately familiar with "feeders"- these are merely INSERT and UPDATE statements issued to the database via some middleware.
8988
docs/replication.markdownnew file+30
@@ -0,0 +1,30 @@
1+# Project:M36 Multi-Node Replication
2+
3+## Introduction
4+
5+The stored transaction graph feature makes Project:M36 naturally more suitable for replication. Just like with git, having access to historical transactions makes merging transactional data much more logical and unambiguous.
6+
7+## Current Multi-Master Support
8+
9+Project:M36 plans to support logical replication in the future. In the meantime, multi-master replication is supported through shared database directories. Using NFS or SMB shares where file locking is properly supported, one can run multiple ```project-m36-server``` instances on the same database directory. This is a shared-storage form of multi-master operation.
10+
11+Multi-master replication is enabled and reasonably fast due to the intentional design decision to rewrite as few files as possible. Typical databases write and rewrite the same files which back relation variables (or tables) directly which necessitates heavy use of file locking or even locks on file content regions. Project:M36 operates on a write-once, read-many (WORM) principle whereby transaction data can be written without holding locks so only the transaction graph itself needs synchronization.
12+
13+Multi-master support can also be useful for simple databases where one wishes to avoid running and maintaining a ```project-m36-server```. Instead, one can create in-process database instances which share the same database directory. This is similar to the use-case for SQLite. However, Project:M36 seamlessly supports server and in-process modes which makes moving from a small, local database to a larger server installation trivial; the storage format is identical.
14+
15+To use the simple multi-master mode, start two instances of ```project-m36-server``` which point at the same local or remote database directory over NFS or SMB. No further configuration is required.
16+
17+## Caveats
18+
19+Project:M36 does not and cannot detect if the filesystem's implementation of file locking is actually functioning.
20+
21+On Linux and macOS, any recent on-disk filesystems and NFS should support POSIX advisory locking, as required. However, sharing the database over samba (SMB) shares or mixed operating systems may result in database transaction graph corruption. The symptom will be that arbitrary, committed transactions may be missing from the transaction graph.
22+
23+On Windows, locking is implemented using mandatory locking controls which any supported version of Windows offers. Cross-platform use of locking (such as with samba server on Linux) is probably *not* safe.
24+
25+If a commit happens behind the back of another ```project-m36-server``` and one server attempts to commit, two possibilities can occur:
26+
27+1. The commits occurred on two disparate branches, so the transaction graph can be updated without conflict.
28+1. The commits occurred on the same branch, so one transaction commit will be rejected with a ```TransactionIsNotAHead``` error. This means that the head (leaf node) of the transaction graph for that branch has moved on, so the transaction needs to be re-executed and committed.
29+
30+To avoid ```TransactionIsNotAHead``` errors, branch the transaction graph and merge it to the head when ready to commit.
docs/sample_session.asciinema.jsonnew file+698
@@ -0,0 +1,698 @@
1+{
2+ "width": 106,
3+ "version": 1,
4+ "command": "cabal run tutd",
5+ "env": {
6+ "TERM": "xterm",
7+ "SHELL": "/bin/bash"
8+ },
9+ "title": null,
10+ "duration": 24.316792,
11+ "stdout": [
12+ [
13+ 0.2,
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docs/server_mode.markdown+2−2
@@ -8,7 +8,7 @@ While Project:M36 is easy-to-use as an interactive, in-process database manageme
88
99To start the Project:M36 server to serve the local host with a database named "mydbname", run ```cabal run project-m36-server -- --database mydbname --hostname 127.0.0.1``` in the project-m36 source directory. The double-dash indicates that the arguments should be passed to ```project-m36-server``` instead of ```cabal```. Under normal conditions, this command will print nothing and block indefinitely to serve incoming requests on the default port 6543.
1010
11−Note that the above invocation will serve and in-memory, transient "mydbname" database. The database is deleted when the server exits. To serve a database with filesystem persistence, invoke ```cabal run project-m36-server -- --database mydbname --hostname 127.0.0.1 --database-directory /path/to/dbdirectory --fsync```.
11+Note that the above invocation will serve an in-memory, transient "mydbname" database. The database is deleted when the server exits. To serve a database with filesystem persistence, invoke ```cabal run project-m36-server -- --database mydbname --hostname 127.0.0.1 --database-directory /path/to/dbdirectory --fsync```.
1212
1313## Connecting an Interactive Client
1414
@@ -16,6 +16,6 @@ To start an interactive session with the server, run ```cabal run tutd -- --data
1616
1717## Connecting a Haskell Client
1818
19−Connecting to a local or remote database uses the same API found in ```ProjectM36.Client```. See [this annotated example](examples/SimpleClient.hs) for more information.
19+Connecting to a local or remote database uses the same API found in ```ProjectM36.Client```. See [this annotated example](../examples/SimpleClient.hs) for more information.
2020
2121
docs/simple_api.markdownnew file+42
@@ -0,0 +1,42 @@
1+# The Project:M36 Simple Client Interface
2+
3+## Introduction
4+
5+For common use cases, the `ProjectM36.Client.Simple` API can assist in transaction management. The API is designed to be less overwhelming than the full-featured `ProjectM36.Client` (see [documentation](projectm36_client_library.markdown)).
6+
7+As such, not all features are available through the simple API, but, because the simple API is a thin layer over the complete API, the user may dip into the complete API at any time.
8+
9+## Usage
10+
11+ 1. Create a `DbConn` to connect to the database:
12+
13+ ```haskell
14+ import ProjectM36.Client.Simple
15+ ...
16+ let connInfo = InProcessConnectionInfo (CrashSafePersistence "my.db") emptyNotificationCallback []
17+ eDbconn <- simpleConnectProjectM36 connInfo
18+ ```
19+
20+ The result is `Either` a `DbError` or a connection linked to the `"master"` branch of the database.
21+
22+ 1. Run the `Db` monad using `withTransaction`:
23+
24+ ```haskell
25+ withTransaction dbconn $ do
26+ execute $ Assign "x" (ExistingRelation relationTrue)
27+ query $ RelationVariable "x" ()
28+ ```
29+
30+ If there is an error in the above update or query, then an exception is thrown behind the scenes which cancels the transactions, rolls back any changes, and the error is returned by `withTransaction`.
31+
32+ `query` is used with `RelationalExpr` queries which read the current database state.
33+
34+ `execute` is used with `DatabaseContextExpr` values which write the current database state.
35+
36+ To execute a query without cancelling the transaction on an error, use the `queryOrErr` and `executeOrErr` variants.
37+
38+ 1. Close the connection:
39+
40+ ```haskell
41+ close dbconn
42+ ```
docs/transaction_graph_operators.markdown+47−25
@@ -10,23 +10,11 @@ When a new database is created, a new transaction graph is created for it with o
1010
1111As the user interactively alters the database context such as by adding a new relation variable, the database context is no longer equal to that of the first transactions. This is called "database context divergence" because many of the same components exist in both the updated context and the context of the first transaction.
1212
13−![Initial database starting state](http://g.gravizo.com/g?
14−digraph G {
15− base[label="base transaction",shape=rectangle];
16− new[label="mutable database context"];
17− new -> base;
18−})
13+![Initial database starting state](http://g.gravizo.com/g?%20digraph%20G%20{%20base[label=%22base%20transaction%22,shape=rectangle];%20new[label=%22mutable%20database%20context%22];%20new%20-%3E%20base;%20})
1914
2015Once the user decides that the changes in the updated database context are worth adding to the transaction graph, the user issues a "commit" request. The commit operation converts the current database context into a new transaction which is then added to the graph with the parent transaction set to the same parent transaction as the database context. The user's mutable database context is shifted to be a copy of the context of the newly-committed transaction.
2116
22−![Freshly committed transaction](http://g.gravizo.com/g?
23−digraph G {
24− base[label="base transaction",shape=rectangle];
25− discon[label="mutable database context"];
26− fresh[label="newly committed transaction",shape=rectangle];
27− fresh -> base;
28− discon -> fresh;
29−})
17+![Freshly committed transaction](http://g.gravizo.com/g?%20digraph%20G%20{%20base[label=%22base%20transaction%22,shape=rectangle];%20discon[label=%22mutable%20database%20context%22];%20fresh[label=%22newly%20committed%20transaction%22,shape=rectangle];%20fresh%20-%3E%20base;%20discon%20-%3E%20fresh;%20})
3018
3119It can be handy to attempt to modify the database without altering the data that others may wish to continue to use and modify. If a set of transactions may diverge from another use-case for the data, the user may choose to "branch" the transaction graph. Branching allows the user to assign an arbitrary name to a series of transactions and then potentially merge the set of transactions back to the originating branch. Project:M36 creates a "master" branch when the transaction graph is first created.
3220
@@ -37,7 +25,7 @@ Note that this transaction graph approach is different from that of most SQL DBM
3725To convert a mutable database context into a transaction, it must be "committed" to the transaction graph. The equivalent in SQL is COMMIT.
3826
3927```
40−TutorialD (master): :commit
28+TutorialD (master/main): :commit
4129```
4230
4331Once committed, the transaction's database context becomes immutable. Internally, Project:M36 uniquely identifies each transaction with a UUID.
@@ -47,7 +35,7 @@ Once committed, the transaction's database context becomes immutable. Internally
4735Sometimes, the user determines that the changes in the mutable database context can be discarded and the context reset to be a copy of its parent's transaction. This is called a "rollback" because it rolls back to a previous known state. The equivalent in SQL is ROLLBACK.
4836
4937```
50−TutorialD (master): :rollback
38+TutorialD (master/main): :rollback
5139```
5240
5341#### Show Transaction Graph
@@ -55,27 +43,31 @@ TutorialD (master): :rollback
5543In order to navigate the transaction graph, one must specify transaction UUIDs. Viewing the entirety of the transaction graph as a relation is a single command.
5644
5745```
58−TutorialD (master): :showgraph
59−┌───────┬──────┬────────────────────────────────────┬───────┐
60−│current│head │id │parents│
61−├───────┼──────┼────────────────────────────────────┼───────┤
46+┌─────────────┬────────────────────────────────────────────┬──────────┬──────────────────────────────────────┬────────────────────────────────────────┬─────────────────────────────────┐
47+│current::Bool│hash::ByteString │head::Text│id::Text │parents::relation {id::Text} │stamp::DateTime │
48+├─────────────┼────────────────────────────────────────────┼──────────┼──────────────────────────────────────┼────────────────────────────────────────┼─────────────────────────────────┤
49+
50+
6251<big result elided>
6352```
6453The "current" attribute is a boolean value. If true, the transaction is the parent of the current database context. Commits will be children of this transaction.
6554
66−The "head attribute is a boolean value indicating whether or not the transaction is a "head" node of its graph. Head nodes are nodes which have no children.
55+The "hash" attribute contains the merkle tree hash for the given transaction. This can be used to ensure that the transaction graph has been used in an append-only fashion, ensuring historical state and audit log integrity.
56+
57+The "head" attribute is a boolean value indicating whether or not the transaction is a "head" node of its graph. Head nodes are nodes which have no children.
6758
6859The "id" attribute is the UUID needed in order to navigate the graph.
6960
7061The "parents" attribute is a subrelation holding all parent transaction UUIDs for the given transaction.
7162
63+The "stamp" attribute marks the time when the transaction was opened.
7264
7365#### Branch
7466
7567A new branch can be create from any point in the transaction. A branch associates a human-readable name with a set of transactions diverging from a parent transaction. After a branch, there are two heads to which one could commit.
7668
7769```
78−TutorialD (master): :branch testing_data_2005
70+TutorialD (master/main): :branch testing_data_2005
7971TutorialD (testing_data_2005):
8072```
8173
@@ -89,7 +81,7 @@ Note that jumping to another head implies losing any changes in the current data
8981
9082```
9183TutorialD (testing_data_2005): :jumphead master
92−TutorialD (master):
84+TutorialD (master/main):
9385```
9486
9587Further commits will be added to the target branch.
@@ -104,12 +96,42 @@ Instead of jumping to the head of a branch for the purpose of adding more commit
10496If one jumps to a non-head transaction, committing new transactions are no longer possible because the past transactions cannot be overwritten.
10597
10698```
107−TutorialD (master): :jump 11b601c9-f46b-42b0-a2ce-cf18ced31b7f
108−TutorialD (11b601c9-f46b-42b0-a2ce-cf18ced31b7f):
99+TutorialD (master/main): :jump 11b601c9-f46b-42b0-a2ce-cf18ced31b7f
100+TutorialD (11b601c9-f46b-42b0-a2ce-cf18ced31b7f):
109101```
110102
111103Note that the ```tutd``` prompt now indicates that the mutable database context now refers to a specific transaction by UUID.
112104
105+#### Walk Back To Time
106+
107+Each transaction is committed along with a creation timestamp. From any point in the graph, one can "walk back" until the commit timestamp is past a given timestamp threshold.
108+
109+```
110+TutorialD (master/main): x:=true
111+TutorialD (master/main): :commit
112+TutorialD (master/main): :showgraph
113+┌─────────────┬──────────┬──────────────────────────────────────┬────────────────────────────────────────┬──────────────────────────────┐
114+│current::Bool│head::Text│id::Text │parents::relation {id::Text} │stamp::DateTime │
115+├─────────────┼──────────┼──────────────────────────────────────┼────────────────────────────────────────┼──────────────────────────────┤
116+│True │"master" │"b4c3bd0a-c594-456f-8e1b-8e296c939df4"│┌──────────────────────────────────────┐│2017-08-10 16:45:34.635582 UTC│
117+│ │ │ ││id::Text ││ │
118+│ │ │ │├──────────────────────────────────────┤│ │
119+│ │ │ ││"5e441752-f78d-4a0d-b7f6-b2716ab82a4d"││ │
120+│ │ │ │└──────────────────────────────────────┘│ │
121+│False │"" │"5e441752-f78d-4a0d-b7f6-b2716ab82a4d"│┌────────┐ │2017-08-10 16:43:59.160044 UTC│
122+│ │ │ ││id::Text│ │ │
123+│ │ │ │└────────┘ │ │
124+└─────────────┴──────────┴──────────────────────────────────────┴────────────────────────────────────────┴──────────────────────────────┘
125+
126+TutorialD (master/main): :walkbacktotime "2017-08-10 16:44:00"
127+TutorialD (<unknown>/main): :showexpr x
128+ERR: RelVarNotDefinedError "x"
129+```
130+
131+In the above example, we start with a fresh database and commit relvar ```x```. Then, using the displayed graph, we walk back to a time before the stamp provided from the graph display and discover that, indeed, ```x``` was not defined in that point in time.
113132
133+Note that all timestamps are in UTC time.
114134
135+If you choose to walk back in time before the database existed, you will see a ```RootTransactionTraversalError```.
115136
137+Note that some transactions, specifically merge transactions, can have multiple parents. In such walk back scenarios, an arbitrary parent is chosen to continue the search. For more precise control, use the other search/jump strategies to set your current transaction behind the merge transaction and then walk back.
docs/transgraphrelationalexpr.markdownnew file+61
@@ -0,0 +1,61 @@
1+# Trans-Graph Relational Expressions
2+
3+## Introduction
4+
5+A standard relational expression queries the state of the database at a single point in time. This point-in-time is represented by an atomic transaction.
6+
7+In contrast, a trans-graph relational expression can refer to any transaction's state in the entire history of the database. For example, a trans-graph relational expression could be used to determine how a relation variable has changed over time.
8+
9+## Motivation
10+
11+Common SQL DBMSs contend all database changes (INSERTs, UPDATEs, DELETEs) on a single state. The DBMS is responsible for simulating serialized access to this ever-changing state. Access to previous states is impossible- the only state visible is the one which is available when the client initiated the transaction.
12+
13+In constrast, Project:M36 allows queries against current *and* past transactions. This is useful for learning how a database has changed over time. One essential use for this feature is for "auditing", whereby the database can be queried to explain how, when, and by whom certain changes were made.
14+
15+## TutorialD Usage
16+
17+In practice, trans-graph relational expressions are very similar to normal relational expressions except that the database context for trans-graph relational expressions is **not** implied. This means that any reference to data in the database context must be marked with a transaction marker. This includes data such as relation variables and atom functions.
18+
19+In ```tutd```, here are two equivalent queries (assuming that ```s``` and ```sp``` are relation variables which have been committed to the ```master``` branch):
20+```
21+TutorialD (master/main): :showexpr s join sp
22+```
23+```
24+TutorialD (master/main): :showtransgraphexpr s@master join sp@master
25+```
26+
27+Note that the only difference is that the second expression explicitly references which transaction the relation variable is referencing. In the first relational expression, this marker is implicit because the query can only reference the current in-flight transaction.
28+
29+Naturally, the trans-graph relational expression is most useful when querying across multiple transactions. This can be accomplished by specifying the transaction id (UUID) or using head name backtracking which is intentionally similar to the git traversal syntax.
30+
31+```
32+TutorialD (master/main): :showtransgraphexpr s@master~ join sp@master
33+```
34+
35+The transaction marker ```master~``` indicates that we wish to reference the first parent of the transaction at the head of the "master" branch. Then, we wish to join it with the relation variable ```sp``` at the head transaction of the master branch. Thusly, we can join two relations from two different transactions.
36+
37+Since transactions can have multiple parents due to merge commits, the ```^x``` syntax can be used to specify the ```x```-th parent of the referenced transaction.
38+
39+These markers can be freely mixed to traverse the graph from a head, as in the following example:
40+
41+```
42+TutorialD (master/main): :showtransgraphexpr s@improveheadlights~^2
43+```
44+
45+This query asks to return relation variable ```s``` at the transaction context from the second parent of the first parent of the head of the "improveheadlights" branch.
46+
47+## Reference
48+
49+Note that relational expressions can query the current in-flight state (called the "disconnected transaction" because it is not committed), while the trans-graph relational expression can only query against committed transactions.
50+
51+Note that the caret operator relies on a notion of parent transaction ordering (the n-th parent transaction of a merge transaction). While this ordering is stable, it is arbitrary, so it is up to the user to verify that the correct branch is traversed.
52+
53+The same ```@``` syntax can be used with relation variables, atom functions and type constructors.
54+
55+Other than the following markers, trans-graph relational expressions share identical syntax with relational expressions.
56+
57+| Syntax | Example | Meaning |
58+|--------|---------|---------|
59+| &lt;uuid&gt; | ```rv@dc385ccc-387e-407d-b65f-e3681cf221a9``` | The relation variable ```rv``` at the state of transaction referred to by explicit unique identifier.|
60+| ^[&lt;n-th parent&gt;] | ```rv@addcustomer^2``` | The relation variable ```rv``` at the state of the second parent transaction of the head transaction of the branch ```addcustomer```. |
61+| ~[&lt;steps&gt;] | ```rv@addcustomer~3``` | The relation variable ```rv``` at the state of the great-grandparent of the head transaction of branch ```addcustomer```. The tilde operator always traverses the "first" parent transaction of any merge transaction.|
docs/tupleable.markdownnew file+68
@@ -0,0 +1,68 @@
1+# Marshaling Haskell Data Types to Database Tuples
2+
3+## Introduction
4+
5+Typical ORMs map certain data types to tuples within a relation variable. Because Project:M36 supports Haskell data types natively, any record data type which derives the ```Generic``` typeclass can be marshaled to a database tuple using the ```Tupleable``` typeclass. These marshaled database values can be operated on within the database using Haskell as well.
6+
7+## Setup
8+
9+Let's imagine we have a Haskell record type "Person" which we wish to map to a tuple in a relation variable called "person". Using ```GHC.Generics```, creating this mapping is trivial. Any record fields which are ```Atomable```, including algebraic data types, are supported.
10+
11+```haskell
12+import ProjectM36.Tupleable
13+
14+data Person = Person {
15+ name :: Text,
16+ employeeNumber :: Int,
17+ likesHorses :: Bool
18+}
19+deriving Generic
20+
21+instance Tupleable Person
22+```
23+
24+Now, ```Person``` values can be marshaled between the database and the client. The attribute names appearing in the Haskell data type will appear identically in the server with the same types.
25+
26+### Changing Options
27+
28+If our field names don't exactly match attribute names, but follow a common pattern, we can derive Tupleable with custom options. Let's say each field on person has a prefix "person", but we still want to use the attribute names without the prefix. We can make use of the ProjectM36.Tupleable module to accomplish our goal like so:
29+
30+```haskell
31+import ProjectM36.Tupleable.Deriving
32+
33+data Person = Person {
34+ personName :: Text,
35+ personEmployeeNumber :: Int,
36+ personLikesHorses :: Bool
37+ }
38+ deriving stock Generic
39+ deriving Tupleable
40+ via Codec (Field (DropPrefix "person" >>> CamelCase)) Person
41+```
42+
43+The extensions DerivingGeneric, DerivingVia, TypeOperators, and DataKinds must be enabled for this code to compile. See the documentation on Hackage for all available options.
44+
45+## Usage
46+
47+The ```Tupleable``` module includes the following functions:
48+
49+ * ```toInsertExpr :: forall a t. (Tupleable a, Traversable t) => t a -> RelVarName -> Either RelationalError DatabaseContextExpr```
50+ * creates an ```Insert``` expression which can be used to insert a set of ```Tupleable``` values into the relation variable named by the ```RelVarName```
51+ * ```toUpdateExpr :: forall a. Tupleable a => RelVarName -> [AttributeName] -> a -> Either RelationalError DatabaseContextExpr```
52+ * create an `Update` expression which updates the tuples with the attribute values of the argument `Tupleable` using the list of attribute names as the key to the underlying relation variable
53+ * ```toDeleteExpr :: forall a. Tupleable a => RelVarName -> [AttributeName] -> a -> Either RelationalError DatabaseContextExpr```
54+ * create a `Delete` expression which will remove the tuples from the relation variable matching the values of the argument `Tupleable` using the attribute name list as the matching key
55+ * ```toAttributes :: proxy a -> Attributes```
56+ * generates ```Attributes``` from a ```Tupleable``` value- can be used with ```undefined```, so an actual value is not necessary
57+ * ```toTuple :: a -> RelationTuple```
58+ * converts a ```Tupleable``` value to a tuple for use in queries
59+ * ```fromTuple :: RelationTuple -> Either RelationalError a```
60+ * converts a tuple to ```Tupleable``` value, unless there is an error such as a missing attribute
61+
62+For example usage, see the [Out of the Tarpit example](/examples/out_of_the_tarpit.hs).
63+
64+## Comparison to Other DBMSes
65+
66+The most annoying misfeature of the so-called object-relational model (ORM) is the data type impedance mismatch. This is especially egregious for Haskell clients which must contend with down-sampling the quality of Haskell data structures. For example, most DBMSes don't support algebraic data types, so the ORM can't represent them or it must represent them as binary or JSON blobs in the database which precludes such types from database-level type safety, constraints, and value queries.
67+
68+Project:M36 solves this mismatch by supporting algebraic data types as database-level values, Haskell scripting of database- and value-level server-side functions, and automatic and lossless marshaling of Haskell algebraic data types to values and tuples. Because the mapping between client data types and database-level data types is one-to-one, the mismatch is eliminated- any expression which could be evaluated against the data type on the client side can also be evaluated server-side.
docs/tutd_cheatsheet.markdownnew file+99
@@ -0,0 +1,99 @@
1+# Tutorial D Cheatsheet
2+
3+The following tables list examples of expressions for `tutd`, Project:M36's "Tutorial D" implementation.
4+
5+## Relational Expressions
6+
7+Relational expressions query database state without being able to change it.
8+
9+|Relational Expression |Description |
10+|------------------------------------------------------|---------------------------------------|
11+|`:showexpr p`|Display the relation variable `p`|
12+|`:showexpr s rename {city as town}`|Display the result after renaming a relational attribute|
13+|`:showexpr p{color,city}`|Display the result of the projection on the `color` and `city` attributes|
14+|`:showexpr p{all but city}`|Display the result of the projection of all attribute of `p` except `city`|
15+|`:showexpr p join sp`|Display the result of the relational expression `p` joined against `sp` (equivalent to `NATURAL JOIN` in SQL)|
16+|`:showexpr (s join sp){all from s}`|Display the result of a join but only include attributes from `s`|
17+|`:showexpr s semijoin sp`|Equivalent to `(s join sp){all from s}`|
18+|`:showexpr s antijoin sp`|Display the result of all tuples in `s` which do not match appear in the result of `s semijoin sp`|
19+|`:showexpr s union s`| Display the result of `s` unioned with itself (which is equivalent to `s`)|
20+|`:showexpr s:{status2:=add(10,@status)}`| Display the result of extending the `s` relation variable with a new attribute which adds 10 to each `status` attribute|
21+|`:showexpr s group ({sname,status,s#} as subrel)`| Display the result of grouping the `sname`, `status`, and `s#` into a subrel for each tuple in the `s` relation where the `city` attribute (not mentioned) is the grouping criteria|
22+|`:showexpr (s group ({sname,status,s#} as subrel)) ungroup subrel`| Display the result of unwrapping a subrelation to create one new tuple for each subrelation tuple in the result|
23+|`:showexpr s minus s`|Display the result after removing all tuples that match the second argument. `x minus x` is equivalent to `x where false`|
24+|`:showexpr relation{tuple{name "Mike",age 6},tuple{name "Sam",age 10}}`|Display an unnamed relation using manually constructed tuples|
25+|`:showexpr relation{a Integer, b Text}`|Display an empty-tupled relation of a specified type|
26+|`:showexpr relation{a Integer, b Text}{tuple{a 4, b "four"}}`|Display a relation bound by the specified types and containing one or more tuples|
27+|`:showexpr s group ({s#,sname,status} as subrel):{citycount:=count(@subrel)}`|Display a result which groups `s` by `city` and extends the relation by a count for each city.|
28+|`:showrelvars`|Display a list of relation variables in the current context along with their types (attributes)|
29+
30+## Built-In Types
31+
32+|Example Value Expression |Type |Explanation|
33+|------------------------------------------------------|---------------------------------------|-----------|
34+|`"abc"`|Text|UTF-8 string|
35+|`123`|Integer|an integer of limitless size (using gmp)|
36+|`int(456)`|Int|machine-word-based integer|
37+|`12.56`|Double|64-bit IEEE 754 floating point number|
38+|`dateTimeFromEpochSeconds(1502304846)`|DateTime||
39+|`fromGregorian(2017,05,30)`|Date||
40+|`t`|Bool|`t` or `f`|
41+|`bytestring("dGVzdGRhdGE=")`|Bytestring|base-64-encoded string of bytes|
42+|`interval(3,5,f,f)`|Interval(Integer)|the constructor function includes two bounds and two boolean flags for inclusiveness|
43+
44+## Database Context Expressions
45+
46+Database context expressions take the current database context as input and alter it to create a new
47+
48+|Database Context Expression |Description |
49+|------------------------------------------------------|---------------------------------------|
50+|`:importexample cjdate`|Imports a precooked schema from Chris Date's books resulting in relvars `s`, `sp`, and `p`|
51+|`:importtutd "file:///home/agentm/project-m36/scripts/emp.tutd"`|Imports TutorialD from file URI|
52+|`:importtutd "https://raw.githubusercontent.com/agentm/project-m36/master/scripts/emp.tutd" "effe32b247586dc3ac0079fc241b9618d41d189afcaeb7907edbe5a8b45992a4"`| Imports TutorialD from HTTP or HTTPS URI|
53+|`newrelvar:=relation{tuple{age 3}}`|Assign a new relation variable named `newrelvar`|
54+|`undefine s`|Remove a relation variable|
55+|`insert s relation{tuple{city "Boston",s# "S10",sname "Gonzalez",status 10}}`| Append to an existing relation variable with another relational expression|
56+|`update s where status=20 (sname:="Mr. Twenty")`|Replace one or more values in matching tuples with a new value|
57+|`delete sp where s#="S4"`|Remove tuples matching the criteria|
58+|`key s_key_constraint {s#} s`|Add a constraint named `s_key_constraint` on relation variable `s` ensuring that `s#` is unique|
59+|`foreign key s#_in_sp sp{s#} in s{s#}`|Add a foreign key constraint that ensures that `sp`'s `s#` attribute always references a `s#` value in `s`|
60+|`constraint s_status_less_than_50 (s where ^lt(50,@status)){} in false`|Add a constraint that stipulates that the `status` values in `s` are less than 50|
61+|`createarbitraryrelation employee {name Text, empid Int, hired DateTime} 3-100`|Create a relation variable with random values with between 3-100 tuples- useful for testing|
62+|`notify steve_change person where name="Steve" true (person where name="Steve"){address}`|Notify the current connection with an asynchronous event if any committed tuples matching `person where name="Steve"` with `true` for the pre-change state and `person where name="Steve"){address}` for the post-change state- these states will be sent along with the notification|
63+|`data Hair = Bald | Brown | Blond | OtherColor Text`|Create a new algebraic data type for use with values inside tuples|
64+|`undata Hair`|Delete the `Hair` custom type|
65+
66+
67+## Transaction Graph Expressions
68+
69+Transaction graph expressions alter the state of the transaction graph by append new states.
70+
71+|Transaction Graph Expression |Description |
72+|------------------------------------------------------|---------------------------------------|
73+|`:commit`|Save the current database context to a new transaction and add it to the transaction graph|
74+|`:rollback`|Return the database context to the state before any alterations were made|
75+|`:branch experimental`|Create a new branch from the existing branch and switch the current context to be able to commit to the new branch|
76+|`:jumphead master`|Discard any changes in the current context and jump to the head of a different branch|
77+|`:jump 11b601c9-f46b-42b0-a2ce-cf18ced31b7f`|Jump to the specific transaction by UUID- useful for introspecting past states|
78+|`:showgraph`|Display a representation of the transaction graph|
79+|`:walkbacktotime "2017-08-10 16:44:00"`|Walk back in time from the current branch until a transaction less than or equal to the time is found and switch the current context to that past transaction- useful for auditing|
80+
81+## Data Frame Expressions
82+
83+In contrast to relational expressions, data frame expressions generate ordered tuples.
84+
85+|Data Frame Expression |Description |
86+|------------------------------------------------------|---------------------------------------|
87+|`:showdataframe s orderby {status}`|Display a data frame result for the relational expression `s` and sort the tuples by `status`|
88+|`:showdataframe s{status} orderby {status descending} offset 1 limit 3`|Display a data frame result for `s{status}` but ordered by `status` values descending, skip the first tuple, and return no more than 3 tuples|
89+
90+## Trans-Graph Relational Expressions
91+
92+Trans-graph relational expressions allow queries spanning multiple transactions.
93+
94+|Trans-Graph Relational Expressions |Description |
95+|------------------------------------------------------|---------------------------------------|
96+|`:showtransgraphexpr s@master join sp@master`|Display a result for joining `s` and `sp` on the branch `master`|
97+|`:showtransgraphexpr s@master~ join sp@master`|Display a result for joining `s` on the parent transaction of `master`'s current head and `sp` on master|
98+|`:showtransgraphexpr s@master~^2`|Display a result for `s` two parents previous to the parent of the current `master`'s head|
99+
docs/tutd_tutorial.markdown+369−213
@@ -9,30 +9,69 @@ It is presumed that the audience for this tutorial has at least some minimal bac
99From the project-m36 source directory, execute ```cabal run tutd``` to start the interactive TutorialD interpreter. You will be greeted by the interactive prompt:
1010
1111```
12−TutorialD (master):
12+TutorialD (master/main):
1313```
1414
1515"master" refers to the name of the branch to which the current transaction will be potentially committing.
1616
17+### Date's Sample Relations
18+
19+The examples in this tutorial can be executed after loading Chris Date's sample relations using:
20+
21+```
22+:importexample cjdate
23+```
24+
25+Each section assumes a fresh instance of the Date examples. The relation variables created in the script are:
26+
27+|Relation Variable Name|Description|
28+|----------------------|-----------|
29+|s|suppliers|
30+|p|parts|
31+|sp|contains mapping of which suppliers supply which parts|
32+
33+### Importing TutorialD from Other Sources
34+
35+The `tutd` console can also run TutorialD from a local file or from a web server.
36+
37+To import TutorialD from a file:
38+
39+```
40+:importtutd "file:///home/agentm/project-m36/scripts/emp.tutd"
41+```
42+
43+or from a web server:
44+
45+```
46+:importtutd "https://raw.githubusercontent.com/agentm/project-m36/master/scripts/DateExamples.tutd" "db9f3d9fe06d0a29b8355e045b89ec94d6428e3a3de93def7ca77bf0298b7010"
47+```
48+
49+The second argument is an optional SHA256 hash in hexadecimal form. This can be used to validate that the script has not changed since the last import. Importing TutorialD from the web is in general safe because it is effectively sandboxed with "Safe Haskell" for functions, so the script is contained security-wise, however, nothing prevents the script from running forever. Downloading a schema from the web is a great way to share schemas and to kick start your project without starting from scratch.
50+
1751### Types
1852
1953TutorialD is strongly-typed. The basic built-in types are:
2054
2155|Type Name|Explanation|Example|
2256|---------|-----------|-------|
23−|char|arbitrary text|"The Old Man and the Sea"|
24−|int|any integer|-4|
25−|datetime|timestamp UTC|"2015-02-02 04:05:02"::datetime|
26−|double|floating point number|3.1459|
27−|bool|boolean value|t|
28−|bytestring|arbitrary-length string of bytes- input is base64-encoded|"dGVzdGRhdGE="::bytestring|
57+|Text|arbitrary text|"The Old Man and the Sea"|
58+|Integer|arbitarily-sized integer|-4|
59+|Int|machine word integer|int(10)|
60+|DateTime|timestamp UTC|dateTimeFromEpochSeconds(1502304846)|
61+|Date|calendar date|fromGregorian(2017,05,30)|
62+|Double|floating point number|3.1459|
63+|Bool|boolean value|t|
64+|Bytestring|arbitrary-length string of bytes- input is base64-encoded|bytestring("dGVzdGRhdGE=")|
65+|Interval x|interval/range type for ints, doubles, datetimes, and dates|interval(3,5,f,f)|
2966
3067With regards to boolean values, be sure not to conflate ```t``` or ```f``` as a boolean value with ```true``` and ```false``` which are relation variables.
3168
69+The ```interval``` function last two arguments are boolean values indicating whether the interval is open at the start point and end point respectively.
70+
3271Project:M36 will complain loudly if the expected types do not match. Automatic type coercion does not exist.
3372
3473```
35−TutorialD (master): :showexpr S:{more:=add(10,@sname)}
74+TutorialD (master/main): :showexpr s:{more:=add(10,@sname)}
3675ERR: AtomFunctionTypeError "add" 2 IntAtomType StringAtomType
3776```
3877
@@ -44,7 +83,7 @@ Relation Variables are named cells which reference relations within a transactio
4483
4584Definition of a relation variable:
4685```
47−products :: {name char, age int}
86+products :: {name Text, age Integer}
4887```
4988This expression creates a new relation variable in the current context which can refer to any relation with the header of "name" of type "char" and "age" of type int.
5089
@@ -63,28 +102,12 @@ Chris Date refers to these relations as "TABLE_DUM" and "TABLE_DEE" but such arb
63102products{}
64103```
65104
66−### Date's Sample Relations
67−
68−The examples in this tutorial can be executed after loading Chris Date's sample relations using:
69−
70−```
71−:importexample date
72−```
73−
74−Each section assumes a fresh instance of the Date examples. The relation variables created in the script are:
75−
76−|Relation Variable Name|Description|
77−|----------------------|-----------|
78−|s|suppliers|
79−|p|parts|
80−|sp|contains mapping of which suppliers supply which parts|
81−
82105### Relational Expressions
83106
84107A relational expression combines relational operators to create a new relation. ```tutd``` can display the result of executing a relational expression with ":showexpr".
85108
86109```
87−TutorialD (master): :showexpr p
110+TutorialD (master/main): :showexpr p
88111┌──────┬─────┬──┬─────┬──────┐
89112│city │color│p#│pname│weight│
90113├──────┼─────┼──┼─────┼──────┤
@@ -100,7 +123,7 @@ TutorialD (master): :showexpr p
100123To show all relation variables in the current session, use ```:showrelvars```:
101124
102125```
103−TutorialD (master): :showrelvars
126+TutorialD (master/main): :showrelvars
104127┌─────────────────────────────────────────────────┬──────────┐
105128│attributes::relation {attribute::Text,type::Text}│name::Text│
106129├─────────────────────────────────────────────────┼──────────┤
@@ -146,16 +169,16 @@ Relational operators generate new relations from existing relations. The operato
146169The unary rename operator outputs a new relation with chosen attributes renamed. In SQL, the equivalent is to use "AS" in the column name list of SELECTS.
147170
148171```
149−TutorialD (master): :showexpr s rename {city as town}
150−┌──┬─────┬──────┬──────┐
151−│s#│sname│status│town │
152−├──┼─────┼──────┼──────┤
153−│S3│Blake│30 │Paris │
154−│S4│Clark│20 │London│
155−│S5│Adams│30 │Athens│
156−│S1│Smith│20 │London│
157−│S2│Jones│10 │Paris │
158−└──┴─────┴──────┴──────┘
172+TutorialD (master/main): :showexpr s rename {city as town}
173+┌────────┬───────────┬───────────────┬──────────┐
174+│s#::Text│sname::Text│status::Integer│town::Text│
175+├────────┼───────────┼───────────────┼──────────┤
176+│"S3" │"Blake" │30 │"Paris" │
177+│"S4" │"Clark" │20 │"London" │
178+│"S5" │"Adams" │30 │"Athens" │
179+│"S1" │"Smith" │20 │"London" │
180+│"S2" │"Jones" │10 │"Paris" │
181+└────────┴───────────┴───────────────┴──────────┘
159182```
160183
161184#### Projection
@@ -165,79 +188,154 @@ Projection is applied by adding curly braces and attribute names following a rel
165188For example:
166189
167190```
168−TutorialD (master): :showexpr p{color,city}
169−┌──────┬─────┐
170−│city │color│
171−├──────┼─────┤
172−│London│Red │
173−│Paris │Blue │
174−│Oslo │Blue │
175−│Paris │Green│
176−└──────┴─────┘
191+TutorialD (master/main): :showexpr p{color,city}
192+┌──────────┬───────────┐
193+│city::Text│color::Text│
194+├──────────┼───────────┤
195+│"London" │"Red" │
196+│"Paris" │"Green" │
197+│"Oslo" │"Blue" │
198+│"Paris" │"Blue" │
199+└──────────┴───────────┘
200+
201+```
202+
203+Projection attributes can also be inverted using `all but`:
204+
205+```
206+TutorialD (master/main): :showexpr s{all but city}
207+┌────────┬───────────┬───────────────┐
208+│s#::Text│sname::Text│status::Integer│
209+├────────┼───────────┼───────────────┤
210+│"S2" │"Jones" │10 │
211+│"S3" │"Blake" │30 │
212+│"S1" │"Smith" │20 │
213+│"S5" │"Adams" │30 │
214+│"S4" │"Clark" │20 │
215+└────────┴───────────┴───────────────┘
216+```
217+
218+Projection attributes can be derived from a relational expression using `all from`:
219+
220+```
221+TutorialD (master/main): :showexpr (s join sp){all from s}
222+┌──────────┬────────┬───────────┬───────────────┐
223+│city::Text│s#::Text│sname::Text│status::Integer│
224+├──────────┼────────┼───────────┼───────────────┤
225+│"London" │"S1" │"Smith" │20 │
226+│"London" │"S4" │"Clark" │20 │
227+│"Paris" │"S2" │"Jones" │10 │
228+│"Paris" │"S3" │"Blake" │30 │
229+└──────────┴────────┴───────────┴───────────────┘
230+```
231+
232+Above, we join `s` and `sp` but project the result back onto the attributes of `s`.
233+
234+Projection attributes can be unioned from multiple sources using `union of`:
235+
236+```
237+TutorialD (master/main): :showexpr (s join sp){union of {all from s} {all but p#}}
238+┌──────────┬────────────┬────────┬───────────┬───────────────┐
239+│city::Text│qty::Integer│s#::Text│sname::Text│status::Integer│
240+├──────────┼────────────┼────────┼───────────┼───────────────┤
241+│"Paris" │400 │"S2" │"Jones" │10 │
242+│"London" │400 │"S1" │"Smith" │20 │
243+│"Paris" │200 │"S3" │"Blake" │30 │
244+│"London" │200 │"S4" │"Clark" │20 │
245+│"London" │200 │"S1" │"Smith" │20 │
246+│"Paris" │300 │"S2" │"Jones" │10 │
247+│"London" │100 │"S1" │"Smith" │20 │
248+│"London" │300 │"S4" │"Clark" │20 │
249+│"London" │300 │"S1" │"Smith" │20 │
250+│"London" │400 │"S4" │"Clark" │20 │
251+└──────────┴────────────┴────────┴───────────┴───────────────┘
177252```
178253
254+Here, after joining `s` and `p`, the union of all attributes from `s` and all attributes from `p` except for `p#` are returned.all
255+
256+Finally, projection attributes can be intersected using `intersection of`:
257+
258+```
259+TutorialD (master/main): :showexpr (s join sp){intersection of {all from s} {all from p}}
260+┌──────────┐
261+│city::Text│
262+├──────────┤
263+│"London" │
264+│"Paris" │
265+└──────────┘
266+```
267+
268+Here, after joining `s` and `p`, we project on the intersection of attributes from `s` and `p` which happens to be `city`.
269+
179270#### Restriction
180271
181272Restriction is applied using a "where" clause, much like in SQL.
182273
183274```
184−TutorialD (master): :showexpr p where color="Blue" and city="Paris"
185−┌─────┬─────┬──┬─────┬──────┐
186−│city │color│p#│pname│weight│
187−├─────┼─────┼──┼─────┼──────┤
188−│Paris│Blue │P5│Cam │12 │
189−└─────┴─────┴──┴─────┴──────┘
275+TutorialD (master/main): :showexpr p where color="Blue" and city="Paris"
276+┌──────────┬───────────┬────────┬───────────┬───────────────┐
277+│city::Text│color::Text│p#::Text│pname::Text│weight::Integer│
278+├──────────┼───────────┼────────┼───────────┼───────────────┤
279+│"Paris" │"Blue" │"P5" │"Cam" │12 │
280+└──────────┴───────────┴────────┴───────────┴───────────────┘
190281```
191282
192283The restriction predicate can be built from "and", "not", and "or". Boolean atom functions can also appear in a restriction as long as they are preceded by "^". For example:
193284
194285```
195−TutorialD (master): :showexpr s where ^lt(@status,20)
196−┌─────┬──┬─────┬──────┐
197−│city │s#│sname│status│
198−├─────┼──┼─────┼──────┤
199−│Paris│S2│Jones│10 │
200−└─────┴──┴─────┴──────┘
286+TutorialD (master/main): :showexpr s where ^lt(@status,20)
287+┌──────────┬────────┬───────────┬───────────────┐
288+│city::Text│s#::Text│sname::Text│status::Integer│
289+├──────────┼────────┼───────────┼───────────────┤
290+│"Paris" │"S2" │"Jones" │10 │
291+└──────────┴────────┴───────────┴───────────────┘
201292```
202293
203294#### Join
204295
205−Joins are binary operators and are applied with the "join" keyword. The equivalent in SQL would be a "NATURAL JOIN". To join attributes which are not identically-named, use the rename operator
296+Joins are binary operators and are applied with the "join" keyword. The equivalent in SQL would be a "NATURAL JOIN". To join attributes which are not identically-named, use the `rename` operator.
206297
207298```
208−TutorialD (master): :showexpr s join sp
209−┌──────┬──┬───┬──┬─────┬──────┐
210−│city │p#│QTY│s#│sname│status│
211−├──────┼──┼───┼──┼─────┼──────┤
212−│London│P6│100│S1│Smith│20 │
213−│London│P3│400│S1│Smith│20 │
214−│London│P5│400│S4│Clark│20 │
215−│London│P1│300│S1│Smith│20 │
216−│Paris │P2│200│S3│Blake│30 │
217−│Paris │P1│300│S2│Jones│10 │
218−│London│P5│100│S1│Smith│20 │
219−│London│P4│300│S4│Clark│20 │
220−│Paris │P2│400│S2│Jones│10 │
221−│London│P2│200│S1│Smith│20 │
222−│London│P4│200│S1│Smith│20 │
223−└──────┴──┴───┴──┴─────┴──────┘
299+TutorialD (master/main): :showexpr s join sp
300+┌──────────┬────────┬────────────┬────────┬───────────┬───────────────┐
301+│city::Text│p#::Text│qty::Integer│s#::Text│sname::Text│status::Integer│
302+├──────────┼────────┼────────────┼────────┼───────────┼───────────────┤
303+│"London" │"P2" │200 │"S1" │"Smith" │20 │
304+│"London" │"P6" │100 │"S1" │"Smith" │20 │
305+│"London" │"P3" │400 │"S1" │"Smith" │20 │
306+│"Paris" │"P2" │400 │"S2" │"Jones" │10 │
307+│"London" │"P5" │400 │"S4" │"Clark" │20 │
308+│"Paris" │"P1" │300 │"S2" │"Jones" │10 │
309+│"London" │"P1" │300 │"S1" │"Smith" │20 │
310+│"Paris" │"P2" │200 │"S3" │"Blake" │30 │
311+│"London" │"P4" │300 │"S4" │"Clark" │20 │
312+│"London" │"P2" │200 │"S4" │"Clark" │20 │
313+│"London" │"P4" │200 │"S1" │"Smith" │20 │
314+│"London" │"P5" │100 │"S1" │"Smith" │20 │
315+└──────────┴────────┴────────────┴────────┴───────────┴───────────────┘
224316```
225317
318+As a convenience, `tutd` also supports semijoin (`matching`) and antijoin (`not matching`) syntax.
319+
320+`s matching sp` or `s semijoin sp` is equivalent to `(s join sp){all from s}` which returns all tuples in `s` which appear in the join of `s` and `sp`.
321+
322+`s not matching sp` or `s antijoin sp` is equivalent to `s minus (s matching sp)` which returns all tuples in `s` which do not appear in the join of `s` and `sp`. Thus, semjoin and antijoin are inverses of each other.
323+
226324#### Union
227325
228326The binary union operator merges tuples from both relations if-and-only-if the attributes of both relations are identical. The SQL equivalent is the "UNION" operator. Unlike SQL, however, duplicate tuples are not tolerated, so there is no "UNION ALL" equivalent in the relational algebra.
229327
230328```
231−TutorialD (master): :showexpr S union S
232−┌──────┬──┬─────┬──────┐
233−│city │s#│sname│status│
234−├──────┼──┼─────┼──────┤
235−│Paris │S3│Blake│30 │
236−│London│S4│Clark│20 │
237−│Athens│S5│Adams│30 │
238−│London│S1│Smith│20 │
239−│Paris │S2│Jones│10 │
240−└──────┴──┴─────┴──────┘
329+TutorialD (master/main): :showexpr s union s
330+┌──────────┬────────┬───────────┬───────────────┐
331+│city::Text│s#::Text│sname::Text│status::Integer│
332+├──────────┼────────┼───────────┼───────────────┤
333+│"Paris" │"S3" │"Blake" │30 │
334+│"Athens" │"S5" │"Adams" │30 │
335+│"London" │"S1" │"Smith" │20 │
336+│"Paris" │"S2" │"Jones" │10 │
337+│"London" │"S4" │"Clark" │20 │
338+└──────────┴────────┴───────────┴───────────────┘
241339```
242340
243341The union of any relation with itself is itself.
@@ -247,16 +345,16 @@ The union of any relation with itself is itself.
247345The extend unary operator adds an attribute to a relation's header and body and is represented by a colon ":". The equivalent in SQL is a subselect in a SELECT column list. Typically, extend is used to add information derived from relation.
248346
249347```
250−TutorialD (master): :showexpr s:{status2:=add(10,@status)}
251−┌──────┬──┬─────┬──────┬───────┐
252−│city │s#│sname│status│status2│
253−├──────┼──┼─────┼──────┼───────┤
254−│Paris │S2│Jones│10 │20 │
255−│Athens│S5│Adams│30 │40 │
256−│Paris │S3│Blake│30 │40 │
257−│London│S1│Smith│20 │30 │
258−│London│S4│Clark│20 │30 │
259−└──────┴──┴─────┴──────┴───────┘
348+TutorialD (master/main): :showexpr s:{status2:=add(10,@status)}
349+┌──────────┬────────┬───────────┬───────────────┬────────────────┐
350+│city::Text│s#::Text│sname::Text│status::Integer│status2::Integer│
351+├──────────┼────────┼───────────┼───────────────┼────────────────┤
352+│"Paris" │"S2" │"Jones" │10 │20 │
353+│"Athens" │"S5" │"Adams" │30 │40 │
354+│"London" │"S4" │"Clark" │20 │30 │
355+│"Paris" │"S3" │"Blake" │30 │40 │
356+│"London" │"S1" │"Smith" │20 │30 │
357+└──────────┴────────┴───────────┴───────────────┴────────────────┘
260358```
261359
262360The "@" is required in the above query in order to distinguish the attribute's name from a relation's name.
@@ -278,29 +376,31 @@ The unary group operator groups the argument attributes into subrelations for ea
278376
279377Grouping is useful for aggregate operations (see below) or for summarizing data against a set of attributes; for example, "display all employees grouped by boss name".
280378
281−```
282−TutorialD (master): :showexpr s group ({sname,status,s#} as subrel)
283−┌──────┬─────────────────┐
284−│city │subrel │
285−├──────┼─────────────────┤
286−│Athens│┌──┬─────┬──────┐│
287−│ ││s#│sname│status││
288−│ │├──┼─────┼──────┤│
289−│ ││S5│Adams│30 ││
290−│ │└──┴─────┴──────┘│
291−│London│┌──┬─────┬──────┐│
292−│ ││s#│sname│status││
293−│ │├──┼─────┼──────┤│
294−│ ││S1│Smith│20 ││
295−│ ││S4│Clark│20 ││
296−│ │└──┴─────┴──────┘│
297−│Paris │┌──┬─────┬──────┐│
298−│ ││s#│sname│status││
299−│ │├──┼─────┼──────┤│
300−│ ││S3│Blake│30 ││
301−│ ││S2│Jones│10 ││
302−│ │└──┴─────┴──────┘│
303−└──────┴─────────────────┘
379+The group operator can also be used to emulate functionality similar to SQL's OUTER JOIN but without relying on overloading the meaning of NULL.
380+
381+```
382+TutorialD (master/main): :showexpr s group ({sname,status,s#} as subrel)
383+┌──────────┬───────────────────────────────────────────────────────┐
384+│city::Text│subrel::relation {s#::Text,sname::Text,status::Integer}│
385+├──────────┼───────────────────────────────────────────────────────┤
386+│"Athens" │┌────────┬───────────┬───────────────┐ │
387+│ ││s#::Text│sname::Text│status::Integer│ │
388+│ │├────────┼───────────┼───────────────┤ │
389+│ ││"S5" │"Adams" │30 │ │
390+│ │└────────┴───────────┴───────────────┘ │
391+│"Paris" │┌────────┬───────────┬───────────────┐ │
392+│ ││s#::Text│sname::Text│status::Integer│ │
393+│ │├────────┼───────────┼───────────────┤ │
394+│ ││"S2" │"Jones" │10 │ │
395+│ ││"S3" │"Blake" │30 │ │
396+│ │└────────┴───────────┴───────────────┘ │
397+│"London" │┌────────┬───────────┬───────────────┐ │
398+│ ││s#::Text│sname::Text│status::Integer│ │
399+│ │├────────┼───────────┼───────────────┤ │
400+│ ││"S4" │"Clark" │20 │ │
401+│ ││"S1" │"Smith" │20 │ │
402+│ │└────────┴───────────┴───────────────┘ │
403+└──────────┴───────────────────────────────────────────────────────┘
304404```
305405
306406#### Ungroup
@@ -308,18 +408,35 @@ TutorialD (master): :showexpr s group ({sname,status,s#} as subrel)
308408The unary ungroup operator "unwraps" subrelations in a relation-valued attribute. There is no equivalent in SQL.
309409
310410```
311−TutorialD (master): :showexpr (s group ({sname,status,s#} as subrel)) ungroup subrel
312−┌──────┬──┬─────┬──────┐
313−│city │s#│sname│status│
314−├──────┼──┼─────┼──────┤
315−│Paris │S3│Blake│30 │
316−│London│S4│Clark│20 │
317−│Athens│S5│Adams│30 │
318−│London│S1│Smith│20 │
319−│Paris │S2│Jones│10 │
320−└──────┴──┴─────┴──────┘
411+TutorialD (master/main): :showexpr (s group ({sname,status,s#} as subrel)) ungroup subrel
412+┌──────────┬────────┬───────────┬───────────────┐
413+│city::Text│s#::Text│sname::Text│status::Integer│
414+├──────────┼────────┼───────────┼───────────────┤
415+│"Paris" │"S2" │"Jones" │10 │
416+│"Paris" │"S3" │"Blake" │30 │
417+│"London" │"S4" │"Clark" │20 │
418+│"London" │"S1" │"Smith" │20 │
419+│"Athens" │"S5" │"Adams" │30 │
420+└──────────┴────────┴───────────┴───────────────┘
421+```
422+
423+#### Minus
424+
425+The binary minus operator takes two relation variables of the same type and returns the tuples which appear in the first relation variable but not in the second relation.
426+
427+```
428+TutorialD (master/main): x:=relation{tuple{name "Steve"},tuple{name "Bob"},tuple{name "Jim"},tuple{name "Bart"}}
429+TutorialD (master/main): y:=relation{tuple{name "Jim"},tuple{name "Bart"}}
430+TutorialD (master/main): :showexpr x minus y
431+┌──────────┐
432+│name::Text│
433+├──────────┤
434+│"Steve" │
435+│"Bob" │
436+└──────────┘
321437```
322438
439+
323440## State Operators
324441
325442While relational operators compose to relational expressions representing queries of the database, state operators change the state of the database.
@@ -331,13 +448,13 @@ While relational operators compose to relational expressions representing querie
331448The relation variable assignment mentioned above certainly changes the state of the database.
332449
333450```
334−TutorialD (master): newrelvar:=relation{tuple{age 3}}
335−TutorialD (master): :showexpr newrelvar
336−┌───┐
337−│age│
338−├───┤
339−│3 │
340−└───┘
451+TutorialD (master/main): newrelvar:=relation{tuple{age 3}}
452+TutorialD (master/main): :showexpr newrelvar
453+┌────────────┐
454+│age::Integer│
455+├────────────┤
456+│3 │
457+└────────────┘
341458```
342459
343460All further operators are convenience operators and could be implemented with simple assignment. SQL has no equivalent to relational assignment; instead, one must issue "CREATE TABLE" commands and insert rows into the resultant tables.
@@ -347,8 +464,8 @@ All further operators are convenience operators and could be implemented with si
347464To signal that a relation variable should be forgotten, undefine it.
348465
349466```
350−TutorialD (master): undefine s
351−TutorialD (master): :showexpr s
467+TutorialD (master/main): undefine s
468+TutorialD (master/main): :showexpr s
352469ERR: RelVarNotDefinedError "s"
353470```
354471
@@ -357,18 +474,18 @@ ERR: RelVarNotDefinedError "s"
357474The insert operators accepts a relation variable and a relation of the same type (a relation having an identical header), and replaces the relation referenced by the relation variable with the union of the previous relation value and the argument's relation value.
358475
359476```
360−TutorialD (master): insert s relation{tuple{city "Boston",s# "S10",sname "Gonzalez",status 10}}
361−TutorialD (master): :showexpr s
362−┌──────┬───┬────────┬──────┐
363−│city │s# │sname │status│
364−├──────┼───┼────────┼──────┤
365−│Paris │S3 │Blake │30 │
366−│London│S4 │Clark │20 │
367−│Athens│S5 │Adams │30 │
368−│London│S1 │Smith │20 │
369−│Paris │S2 │Jones │10 │
370−│Boston│S10│Gonzalez│10 │
371−└──────┴───┴────────┴──────┘
477+TutorialD (master/main): insert s relation{tuple{city "Boston",s# "S10",sname "Gonzalez",status 10}}
478+TutorialD (master/main): :showexpr s
479+┌──────────┬────────┬───────────┬───────────────┐
480+│city::Text│s#::Text│sname::Text│status::Integer│
481+├──────────┼────────┼───────────┼───────────────┤
482+│"Athens" │"S5" │"Adams" │30 │
483+│"Paris" │"S2" │"Jones" │10 │
484+│"Boston" │"S10" │"Gonzalez" │10 │
485+│"London" │"S4" │"Clark" │20 │
486+│"London" │"S1" │"Smith" │20 │
487+│"Paris" │"S3" │"Blake" │30 │
488+└──────────┴────────┴───────────┴───────────────┘
372489```
373490
374491This insertion operation is equivalent to:
@@ -381,33 +498,33 @@ s:=s union relation{tuple{city "Boston",s# "S10",sname "Gonzalez",status 10}}
381498The update operator accepts a relation argument and a predicate, optionally filters and creates new tuples based on the original relation.
382499
383500```
384−TutorialD (master): update s where status=20 (sname:="Mr. Twenty")
385−TutorialD (master): :showexpr s
386−┌──────┬──┬──────────┬──────┐
387−│city │s#│sname │status│
388−├──────┼──┼──────────┼──────┤
389−│Paris │S3│Blake │30 │
390−│London│S1│Mr. Twenty│20 │
391−│Athens│S5│Adams │30 │
392−│Paris │S2│Jones │10 │
393−│London│S4│Mr. Twenty│20 │
394−└──────┴──┴──────────┴──────┘
501+TutorialD (master/main): update s where status=20 (sname:="Mr. Twenty")
502+TutorialD (master/main): :showexpr s
503+┌──────────┬────────┬────────────┬───────────────┐
504+│city::Text│s#::Text│sname::Text │status::Integer│
505+├──────────┼────────┼────────────┼───────────────┤
506+│"Paris" │"S2" │"Jones" │10 │
507+│"London" │"S1" │"Mr. Twenty"│20 │
508+│"Paris" │"S3" │"Blake" │30 │
509+│"London" │"S4" │"Mr. Twenty"│20 │
510+│"Athens" │"S5" │"Adams" │30 │
511+└──────────┴────────┴────────────┴───────────────┘
395512```
396513
397514This is logically equivalent to:
398515
399516```
400−TutorialD (master): s:=(((s where status=20){city,s#,status}):{sname:="Mr. Twenty"}) union (s where not status=20)
401−TutorialD (master): :showexpr s
402−┌──────┬──┬──────────┬──────┐
403−│city │s#│sname │status│
404−├──────┼──┼──────────┼──────┤
405−│Paris │S3│Blake │30 │
406−│London│S1│Mr. Twenty│20 │
407−│Athens│S5│Adams │30 │
408−│Paris │S2│Jones │10 │
409−│London│S4│Mr. Twenty│20 │
410−└──────┴──┴──────────┴──────┘
517+TutorialD (master/main): s:=(((s where status=20){city,s#,status}):{sname:="Mr. Twenty"}) union (s where not status=20)
518+TutorialD (master/main): :showexpr s
519+┌──────────┬────────┬────────────┬───────────────┐
520+│city::Text│s#::Text│sname::Text │status::Integer│
521+├──────────┼────────┼────────────┼───────────────┤
522+│"Paris" │"S2" │"Jones" │10 │
523+│"London" │"S1" │"Mr. Twenty"│20 │
524+│"Paris" │"S3" │"Blake" │30 │
525+│"London" │"S4" │"Mr. Twenty"│20 │
526+│"Athens" │"S5" │"Adams" │30 │
527+└──────────┴────────┴────────────┴───────────────┘
411528```
412529
413530This query means: "Drop the sname attribute from S filtered where status equals 20, extend the resultant relation by sname with value 'Mr. Twenty', then union the resultant relation with S filtered by status not equaling 20, and assign that to S."
@@ -417,27 +534,27 @@ This query means: "Drop the sname attribute from S filtered where status equals
417534The delete operator accepts a relation argument and a filtering predicate, creates a new relation with only the tuples which do not match the predicate, and stores the result in the relation variable argument.
418535
419536```
420−TutorialD (master): delete sp where s#="S4"
421−TutorialD (master): :showexpr sp
422−┌──┬───┬──┐
423−│p#│QTY│s#│
424−├──┼───┼──┤
425−│P3│400│S1│
426−│P4│200│S1│
427−│P2│400│S2│
428−│P2│200│S1│
429−│P6│100│S1│
430−│P1│300│S1│
431−│P2│200│S3│
432−│P1│300│S2│
433−│P5│100│S1│
434−└──┴───┴──┘
537+TutorialD (master/main): delete sp where s#="S4"
538+TutorialD (master/main): :showexpr sp
539+┌────────┬────────────┬────────┐
540+│p#::Text│qty::Integer│s#::Text│
541+├────────┼────────────┼────────┤
542+│"P2" │200 │"S3" │
543+│"P2" │400 │"S2" │
544+│"P1" │300 │"S1" │
545+│"P5" │100 │"S1" │
546+│"P4" │200 │"S1" │
547+│"P1" │300 │"S2" │
548+│"P3" │400 │"S1" │
549+│"P2" │200 │"S1" │
550+│"P6" │100 │"S1" │
551+└────────┴────────────┴────────┘
435552```
436553
437554This is logically equivalent to:
438555
439556```
440−TutorialD (master): sp:=sp where not s#="S4"
557+TutorialD (master/main): sp:=sp where not s#="S4"
441558```
442559
443560Note the inverted predicate.
@@ -453,7 +570,7 @@ Chris Date identified that all constraints can be represented as inclusion depen
453570Uniqueness constraints ensure that a set of attributes' values are unique throughout a relational expression. For example, it is useful to ensure that all products' identifiers are unique. The equivalent in SQL is the UNIQUE expression found in table creation.
454571
455572```
456−TutorialD (master): key s_key_constraint {s#} s
573+TutorialD (master/main): key s_key_constraint {s#} s
457574```
458575
459576This expression creates a constraint named "S_key_constraint" and ensure that the values of the "s#" attribute are unique in the "S" relational expression.
@@ -463,21 +580,35 @@ This expression creates a constraint named "S_key_constraint" and ensure that th
463580Foreign keys are constraints which require that certain values appearing in one relation variable must appear in another. The equivalent in SQL is the FOREIGN KEY() construction in table creation.
464581
465582```
466−TutorialD (master): foreign key s#_in_sp sp{s#} in s{s#}
583+TutorialD (master/main): foreign key s#_in_sp sp{s#} in s{s#}
467584```
468585
469−This expression ensure that any sp{s#} must also appear as a value in s{s#}.
586+This expression ensure that any sp{s#} must also appear as a value in s{s#}. Note that the sub-expression (on the left of "in") and the super-expression (on the right) must be of the same relation type- the generated relation values' attribute names and types must be equal. Use `rename` to make attribute names identical.
587+
588+#### Functional dependencies
589+
590+Unlike SQL databases, Project:M36 includes first-class support for functional dependencies. A functional dependency for an attribute set ```A``` to attribute set ```B``` ensures that for every unique appearance of a value for ```A``` there is only one possible value for ```B```.
591+
592+To create a functional dependency:
593+
594+```
595+TutorialD (master/main): funcdep sname_status (sname) -> (status) s
596+```
597+
598+In this example, the functional dependency is named "sname_status" and creates a constraint which ensures that the "sname" value is functionally determines "status" value in the relation variable "s", though the final argument can be any relational expression. Multiple attribute names are separated by a comma.
470599
471600#### Other Constraints
472601
473602All other constraints can be represented by a set of inclusion dependencies.
474603
475604```
476−TutorialD (master): constraint s_status_less_than_50 (s where ^lt(50,@status)){} in false
605+TutorialD (master/main): constraint s_status_less_than_50 (s where ^lt(50,@status)){} in false
477606```
478607
479608This expression ensures that the relation variable's relation can never include a tuple with status greater than 50.
480609
610+Internally, *all* constraints are converted and stored as inclusion dependencies.
611+
481612## Aggregate Queries
482613
483614Aggregate queries in TutorialD are able to provide much more information than SQL queries due to the support for relation-valued attributes. For example, a single query can return aggregate results alongside its constituent tuples.
@@ -485,28 +616,28 @@ Aggregate queries in TutorialD are able to provide much more information than SQ
485616SQL supports aggregate queries using aggregate functions (SUM(), COUNT(), AVERAGE(), etc.) and GROUP BY while the aggregate functions in the relational algebra simply accept relation values as arguments.
486617
487618```
488−TutorialD (master): :showexpr s group ({s#,sname,status} as subrel):{citycount:=count(@subrel)}
489−┌──────┬─────────┬─────────────────┐
490−│city │citycount│subrel │
491−├──────┼─────────┼─────────────────┤
492−│Paris │2 │┌──┬─────┬──────┐│
493−│ │ ││s#│sname│status││
494−│ │ │├──┼─────┼──────┤│
495−│ │ ││S3│Blake│30 ││
496−│ │ ││S2│Jones│10 ││
497−│ │ │└──┴─────┴──────┘│
498−│London│2 │┌──┬─────┬──────┐│
499−│ │ ││s#│sname│status││
500−│ │ │├──┼─────┼──────┤│
501−│ │ ││S1│Smith│20 ││
502−│ │ ││S4│Clark│20 ││
503−│ │ │└──┴─────┴──────┘│
504−│Athens│1 │┌──┬─────┬──────┐│
505−│ │ ││s#│sname│status││
506−│ │ │├──┼─────┼──────┤│
507−│ │ ││S5│Adams│30 ││
508−│ │ │└──┴─────┴──────┘│
509−└──────┴─────────┴─────────────────┘
619+TutorialD (master/main): :showexpr s group ({s#,sname,status} as subrel):{citycount:=count(@subrel)}
620+┌──────────┬──────────────────┬───────────────────────────────────────────────────────┐
621+│city::Text│citycount::Integer│subrel::relation {s#::Text,sname::Text,status::Integer}│
622+├──────────┼──────────────────┼───────────────────────────────────────────────────────┤
623+│"Athens" │1 │┌────────┬───────────┬───────────────┐ │
624+│ │ ││s#::Text│sname::Text│status::Integer│ │
625+│ │ │├────────┼───────────┼───────────────┤ │
626+│ │ ││"S5" │"Adams" │30 │ │
627+│ │ │└────────┴───────────┴───────────────┘ │
628+│"Paris" │2 │┌────────┬───────────┬───────────────┐ │
629+│ │ ││s#::Text│sname::Text│status::Integer│ │
630+│ │ │├────────┼───────────┼───────────────┤ │
631+│ │ ││"S2" │"Jones" │10 │ │
632+│ │ ││"S3" │"Blake" │30 │ │
633+│ │ │└────────┴───────────┴───────────────┘ │
634+│"London" │2 │┌────────┬───────────┬───────────────┐ │
635+│ │ ││s#::Text│sname::Text│status::Integer│ │
636+│ │ │├────────┼───────────┼───────────────┤ │
637+│ │ ││"S4" │"Clark" │20 │ │
638+│ │ ││"S1" │"Smith" │20 │ │
639+│ │ │└────────┴───────────┴───────────────┘ │
640+└──────────┴──────────────────┴───────────────────────────────────────────────────────┘
510641```
511642
512643In this query result, we can simultaneously answer how many suppliers are located in each city and which suppliers they are. The expression is constructed by first grouping to isolate the city, then extending the query to add a attribute containing the tuple count for each subrelation.
@@ -517,3 +648,28 @@ In this query result, we can simultaneously answer how many suppliers are locate
517648|sum(relation{int})|return the int sum of the relation's values|
518649|max(relation{int})|return the maximum int from all the relation's values|
519650|min(relation{int})|return the minimum int from all the relation's values|
651+
652+#### Arbitrary Relation Variables
653+
654+For testing purposes, it can be useful to populate a database with randomly generated data. Project:M36 can automatically create such data based solely on the type of the relation.
655+
656+```
657+TutorialD (master/main): createarbitraryrelation employee {name Text, empid Int, hired DateTime} 3-100
658+TutorialD (master/main): :showexpr employee
659+┌──────────┬───────────────────────┬──────────┐
660+│empid::Int│hired::DateTime │name::Text│
661+├──────────┼───────────────────────┼──────────┤
662+│23 │1858-11-04 10:50:14 UTC│"LLL" │
663+│22 │1858-12-10 14:53:37 UTC│"LLL" │
664+│25 │1858-11-07 01:14:15 UTC│"SSS" │
665+│-12 │1858-11-06 06:20:57 UTC│"VVV" │
666+│-6 │1858-11-01 16:26:38 UTC│"SSS" │
667+│-1 │1858-10-31 14:41:26 UTC│"DDD" │
668+│-15 │1858-11-26 04:14:03 UTC│"VVV" │
669+│-18 │1858-12-17 00:01:09 UTC│"AAA" │
670+│-9 │1858-10-31 08:36:53 UTC│"XXX" │
671+│4 │1858-11-23 01:48:04 UTC│"VVV" │
672+└──────────┴───────────────────────┴──────────┘
673+```
674+
675+The `createarbitraryrelation` syntax specifies the name of the relation variable, the type for the relation, and then an acceptable range for the tuple count.
docs/using_notifications.markdown+29−25
@@ -9,8 +9,9 @@ As an example, consider an email application. Users of the applications will wan
99A Project:M36 notification is comprised of three user-selected parts:
1010
11111. an arbitrary notification name: used to uniquely identify the notification in the server and client
12−2. a trigger relational expression: when the outcome of this relational expression changes between two transactions, the notification is fired
13−3. a report relational expression: when the notification fires, the expression is evaluated and passed along
12+1. a trigger relational expression: when the outcome of this relational expression changes between two transactions, the notification is fired
13+1. a report relational expression for the pre-change context: when the notification fires, the expression is evaluated in the old context and passed along
14+1. a report relational expression for the post-change context: when the notification fires, the expression is evaluated in the new context and passed along
1415
1516By separating the "trigger" and "report" expressions, database users control what kind of reporting they receive when the outcome of a relational expression changes.
1617
@@ -21,7 +22,7 @@ Currently, notifications are sent to all connected clients and not only to the c
2122Notifications can be created in the ```tutd``` TutorialD interpreter with the following syntax:
2223
2324```
24−notify <notification name> <trigger relational expression> <report relational expression>
25+notify <notification name> <trigger relational expression> <report relational expression (pre-change)> <report relational expression (post-change)>
2526```
2627
2728## Deleting a Notification
@@ -37,41 +38,44 @@ unnotify <notification name>
3738Consider the following ```person``` relation variable where "name" is a key:
3839
3940```
40−TutorialD (master): person:=relation{tuple{name "Steve",address "Main St."},tuple{name "John", address "Elm St."}}
41−TutorialD (master): :showexpr person
42−┌────────┬─────┐
43−│address │name │
44−├────────┼─────┤
45−│Elm St. │John │
46−│Main St.│Steve│
47−└────────┴─────┘
41+TutorialD (master/main): person:=relation{tuple{name "Steve",address "Main St."},tuple{name "John", address "Elm St."}}
42+TutorialD (master/main): :showexpr person
43+┌─────────────┬──────────┐
44+│address::Text│name::Text│
45+├─────────────┼──────────┤
46+│"Main St." │"Steve" │
47+│"Elm St." │"John" │
48+└─────────────┴──────────┘
4849```
4950
5051If a remote application is currently the address in the tuple for "Steve", then it would install a notification for that tuple's key:
5152
5253```
53−TutorialD (master): notify steve_change person where name="Steve" (person where name="Steve"){address}
54−TutorialD (master): :commit
54+TutorialD (master/main): notify steve_change person where name="Steve" true (person where name="Steve"){address}
55+TutorialD (master/main): :commit
5556```
5657
58+In this case, we pass `true` as the old context report expression because we plan to ignore the result.
59+
5760Then, when any client including the initiating client updates the "Steve" tuple, an asynchronous notification is fired:
5861
5962```
60−TutorialD (master): update person where name="Steve" (address:="Grove St.")
61−TutorialD (master): :commit
62−TutorialD (master): Notification received "steve_change": ...
63+TutorialD (master/main): update person where name="Steve" (address:="Grove St.")
64+TutorialD (master/main): :commit
65+TutorialD (master/main): Notification received "steve_change": ...
6366```
6467
65−The asynchronously-received notification contains the result from the evaluated report relational expression. The expression, in this case, is the result of the report expression evaluated against the parent transactoin
68+The asynchronously-received notification contains the result from the evaluated report relational expression. The expression, in this case, is the result of the report expression evaluated against the new transaction:
6669
6770```
68−TutorialD (master): Notification received "steve_change":
71+TutorialD (master/main): Notification received "steve_change":
6972Project (AttributeNames (fromList ["address"])) (Restrict (AttributeEqualityPredicate "name" (NakedAtomExpr Atom "Steve")) (RelationVariable "person"))
70−┌────────┐
71−│address │
72−├────────┤
73−│Main St.│
74−└────────┘
73+┌─────────────┐
74+│address::Text│
75+├─────────────┤
76+│"Grove St." │
77+└─────────────┘
78+
7579```
7680
7781## Notifications with ProjectM36.Client
@@ -80,10 +84,10 @@ First, implement a ```NotificationCallback``` function to perform an IO action w
8084
8185Each ProjectM36 Connection can only have one callback and it cannot be changed after Connection creation.
8286
83−Then, create a DatabaseExpr using the AddNotification constructor:
87+Then, create a DatabaseContextExpr using the AddNotification constructor:
8488
8589```
86−AddNotification <notification name::Text> <change expression::RelationalExpr> <report expression::RelationalExpr>
90+AddNotification <notification name::Text> <change expression::RelationalExpr> <report old context expression::RelationalExpr> <report new context expression::RelationalExpr>
8791```
8892
8993and execute it using ```executeDatabaseContextExpr```. In order for a notification to take effect, it must be committed as well.
docs/websocket_server.markdown+3−3
@@ -6,7 +6,7 @@ The Project:M36 WebSocket server makes it easy to connect non-Haskell programs t
66
77## Setup
88
9−The websocket server is started with the same arguments as the normal [Project:M36 server](docs/server_mode.markdown):
9+The websocket server is started with the same arguments as the normal [Project:M36 server](server_mode.markdown):
1010
1111```
1212cabal run project-m36-websocket-server -- --database mydbname --hostname 127.0.0.1
@@ -16,8 +16,8 @@ except that the websocket server is now listening for websocket connections on p
1616
1717## Client Connection
1818
19−A [simple JavaScript library](ProjectM36/Server/WebSocket/project-m36.js) to manage the WebSocket connection is available.
19+A [simple JavaScript library](/src/bin/ProjectM36/Server/WebSocket/project-m36.js) to manage the WebSocket connection is available.
2020
2121## Sample Application
2222
23−The [WebSocket example application](ProjectM36/Server/WebSocket/websocket-client.html) can be used to learn TutorialD and for remote database access from the web browser.
23+The [WebSocket example application](/src/bin/ProjectM36/Server/WebSocket/websocket-client.html) can be used to learn TutorialD and for remote database access from the web browser.
examples/CustomTupleable.hsnew file+67
@@ -0,0 +1,67 @@
1+{-# LANGUAGE DeriveGeneric, OverloadedStrings #-}
2+--this example shows how to implement a non-generics-defined Tupleable instance which is required in scenarios where Haskell-side types are not supported server-side or where one wishes to represent a nested relation
3+import ProjectM36.Client
4+import ProjectM36.Tuple
5+import ProjectM36.Tupleable
6+import ProjectM36.Relation
7+import ProjectM36.Atom
8+import ProjectM36.Attribute as A
9+import qualified Data.Set as S
10+import qualified Data.Map as M
11+import Data.Text (Text)
12+import GHC.Generics
13+import Data.Proxy
14+
15+--in this contrived example, we wish to represent one relation with a nested relation of comments
16+data Blog = Blog {
17+ title :: Text,
18+ comments :: S.Set Comment
19+ } deriving (Show)
20+
21+data Comment = Comment {
22+ authorName :: Text,
23+ comment :: Text
24+ } deriving (Eq, Show, Generic, Ord)
25+
26+instance Tupleable Comment
27+
28+instance Tupleable Blog where
29+ toTuple blogentry =
30+ mkRelationTupleFromMap (M.fromList [("title", TextAtom (title blogentry)),
31+ ("comments", RelationAtom relFromComments)])
32+ where
33+ commentTuples = map toTuple (S.toList (comments blogentry))
34+ relFromComments = case mkRelationFromTuples (toAttributes (Proxy :: Proxy Comment)) commentTuples of
35+ Left err -> error (show err)
36+ Right rel -> rel
37+
38+ fromTuple tupIn = do
39+ titleAtom <- atomForAttributeName "title" tupIn
40+ commentsAtom <- atomForAttributeName "comments" tupIn
41+ commentsRel <- relationForAtom commentsAtom
42+ comments' <- mapM fromTuple (tuplesList commentsRel)
43+ pure Blog {
44+ title = atomToText titleAtom,
45+ comments = S.fromList comments'}
46+
47+ toAttributes _ = A.attributesFromList [Attribute "title" TextAtomType,
48+ Attribute "comments" $ RelationAtomType (toAttributes (Proxy :: Proxy Comment))]
49+
50+main :: IO ()
51+main = do
52+ let exampleBlog = Blog { title = "Cat Pics",
53+ comments = S.fromList [Comment {authorName = "Steve",
54+ comment = "great"},
55+ Comment {authorName = "Bob",
56+ comment = "enough"}
57+ ]}
58+ print (toTuple exampleBlog)
59+ print (fromTuple (toTuple exampleBlog) :: Either RelationalError Blog)
60+
61+
62+
63+
64+
65+
66+
67+
examples/DerivingCustomTupleable.hsnew file+54
@@ -0,0 +1,54 @@
1+{-# LANGUAGE DeriveGeneric, DerivingVia, GeneralizedNewtypeDeriving, TypeOperators, DataKinds, OverloadedStrings #-}
2+
3+import ProjectM36.Tupleable.Deriving
4+import ProjectM36.Atomable (Atomable)
5+import Control.DeepSeq (NFData)
6+import Data.Text (Text)
7+import GHC.Generics (Generic)
8+import Codec.Winery
9+
10+newtype BlogId = BlogId { getBlogId :: Int }
11+ deriving stock (Eq, Ord, Show, Generic)
12+ deriving newtype (Num)
13+ deriving Serialise via WineryRecord BlogId
14+
15+instance NFData BlogId
16+instance Atomable BlogId
17+
18+data Blog = Blog
19+ { blogId :: BlogId
20+ , blogTitle :: Text
21+ , blogAuthorName :: Text
22+ }
23+ deriving stock (Show, Generic)
24+ deriving (Tupleable)
25+ via Codec (Field (DropPrefix "blog" >>> CamelCase)) Blog
26+ deriving Serialise via WineryRecord Blog
27+
28+data Comment = Comment
29+ { commentAuthorName :: Text
30+ , commentComment :: Text
31+ , commentFor :: BlogId
32+ }
33+ deriving stock (Show, Generic)
34+ deriving (Tupleable)
35+ via Codec (Field (DropPrefix "comment" >>> CamelCase)) Comment
36+ deriving Serialise via WineryRecord Comment
37+
38+main :: IO ()
39+main = do
40+ let exampleBlog = Blog
41+ { blogId = 0
42+ , blogTitle = "Cat Pics"
43+ , blogAuthorName = "Alice"
44+ }
45+ exampleComment = Comment
46+ { commentAuthorName = "Bob"
47+ , commentComment = "great"
48+ , commentFor = 0
49+ }
50+ print exampleBlog
51+ print (toTuple exampleBlog)
52+ putStrLn ""
53+ print exampleComment
54+ print (toTuple exampleComment)
examples/DynamicAtomFunctions.hsnew file+12
@@ -0,0 +1,12 @@
1+{-# LANGUAGE OverloadedStrings #-}
2+--compile with `cabal exec ghc -- examples/DynamicAtomFunctions.hs -package project-m36`
3+--load with `loadatomfunctions "DynamicAtomFunctions" "someAtomFunctions" "examples/DynamicAtomFunctions.o"`
4+
5+module DynamicAtomFunctions where
6+import ProjectM36.Base
7+
8+someAtomFunctions :: [AtomFunction]
9+someAtomFunctions = [AtomFunction{
10+ atomFuncName = "constTrue",
11+ atomFuncType = [TypeVariableType "a", BoolAtomType],
12+ atomFuncBody = AtomFunctionBody Nothing (\(x:_) -> pure (BoolAtom True))}]
examples/DynamicDatabaseContextFunctions.hsnew file+26
@@ -0,0 +1,26 @@
1+{-# LANGUAGE OverloadedStrings #-}
2+--compile with `cabal exec ghc -- examples/DynamicDatabaseContextFunctions.hs -package project-m36`
3+--load with `loaddatabasecontextfunctions "DynamicDatabaseContextFunctions" "someDBCFunctions" "examples/DynamicDatabaseContextFunctions.o"`
4+module DynamicDatabaseContextFunctions where
5+import ProjectM36.Base
6+import ProjectM36.Relation
7+import ProjectM36.DatabaseContextFunctionError
8+import qualified ProjectM36.Attribute as A
9+
10+import qualified Data.Map as M
11+
12+
13+someDBCFunctions :: [DatabaseContextFunction]
14+someDBCFunctions = [DatabaseContextFunction {
15+ dbcFuncName = "addtestrel",
16+ dbcFuncType = [],
17+ dbcFuncBody = DatabaseContextFunctionBody Nothing addTestRel
18+ }]
19+ where
20+ addTestRel _ ctx = do
21+ let attrs = A.attributesFromList [Attribute "word" TextAtomType]
22+ eRel = mkRelationFromList attrs [[TextAtom "nice"]]
23+ case eRel of
24+ Left err -> Left (DatabaseContextFunctionUserError (show err))
25+ Right testRel ->
26+ pure $ ctx { relationVariables = M.insert "testRel" testRel (relationVariables ctx) }
examples/Hospital.hs+5−5
@@ -25,7 +25,7 @@ failFastMaybe :: (Show a) => Maybe a -> IO ()
2525failFastMaybe (Just err) = error (show err)
2626failFastMaybe Nothing = return ()
2727
28−failFastEither :: (Show a) => Either a b -> IO (b)
28+failFastEither :: Show a => Either a b -> IO b
2929failFastEither (Left err) = error (show err)
3030failFastEither (Right val) = return val
3131
@@ -53,11 +53,11 @@ runExample = do
5353 Nothing -> error "not a singleton relation!"
5454 Just tuple -> do
5555 (Atom age_value_out) <- failFastEither $ atomForAttributeName "age" tuple
56− putStrLn (show age_value_in)
57− putStrLn (show age_value_out)
56+ print age_value_in
57+ print age_value_out
5858 case cast age_value_out of
5959 Nothing -> error "wrong datatype"
60− Just age_value_out' -> do
61− putStrLn (show (age_value_in == age_value_out'))
60+ Just age_value_out' ->
61+ print (age_value_in == age_value_out')
6262
6363
examples/PersistClient.hsdeleted−54
@@ -1,54 +0,0 @@
1−{-# LANGUAGE TemplateHaskell, QuasiQuotes, TypeFamilies, GADTs, EmptyDataDecls, TypeSynonymInstances, FlexibleInstances, FlexibleContexts, RankNTypes, MultiParamTypeClasses, GeneralizedNewtypeDeriving #-}
2−{-# OPTIONS_GHC -fno-warn-orphans #-}
3−{- A simple example of using the persistent-ProjectM36 driver. -}
4−import Database.Persist.ProjectM36 hiding (executeDatabaseContextExpr)
5−import ProjectM36.Client
6−import System.Exit
7−import System.IO
8−import Database.Persist
9−import Database.Persist.TH
10−import Language.Haskell.TH.Syntax
11−import Control.Monad.Reader
12−
13−--1. declare the models with Template Haskell
14−let projectM36PersistSettings = mkPersistSettings (ConT ''ProjectM36Backend)
15− in
16− share [mkPersist projectM36PersistSettings] [persistLowerCase|
17−Person
18− name String Eq
19− age Int
20− UniqueName name
21− deriving Show
22−|]
23−
24−errDie :: String -> IO ()
25−errDie out = hPutStrLn stderr out >> exitFailure
26−
27−defPersonRel :: SessionId -> Connection -> IO ()
28−defPersonRel sessionId conn = do
29− let attrList = [Attribute "name" TextAtomType, Attribute "age" IntAtomType, Attribute "id" TextAtomType]
30− maybeErr <- executeDatabaseContextExpr sessionId conn (Define "person" (map NakedAttributeExpr attrList))
31− case maybeErr of
32− Nothing -> return ()
33− Just err -> errDie (show err)
34−
35−main :: IO ()
36−main = do
37− --1. create the database connection
38− let connInfo = InProcessConnectionInfo NoPersistence emptyNotificationCallback []
39− withProjectM36Conn connInfo $ runProjectM36Conn $ do
40− --2. use the underlying client connection and session to define a relation variable
41− (sessionId, conn) <- ask
42− liftIO $ defPersonRel sessionId conn
43− --3. insert some data
44− _ <- insert $ Person "Michael" 33
45− _ <- insert $ Person "Steve" 20
46− --4. query on a unique key
47− michael <- getBy $ UniqueName "Michael"
48− liftIO $ putStrLn (show michael)
49− --5. other queries
50− youngerThan30Users <- selectList [PersonAge <. 30] []
51− liftIO $ putStrLn (show youngerThan30Users)
52− -- Updates and deletes operate by normal persistent APIs.
53− -- Sorting results is not yet supported.
54−
examples/Plantfarm.hsnew file+446
@@ -0,0 +1,446 @@
1+{-# LANGUAGE DeriveGeneric #-}
2+
3+{-# LANGUAGE OverloadedStrings #-}
4+
5+{-# LANGUAGE DeriveAnyClass #-}
6+
7+{-# LANGUAGE DerivingVia #-}
8+
9+
10+import Codec.Winery (Serialise, WineryVariant(WineryVariant))
11+import Control.DeepSeq (NFData)
12+import Data.Aeson (FromJSON, ToJSON(toEncoding, toJSON))
13+import Data.Data (Proxy(Proxy))
14+import Data.Either (lefts, rights)
15+import Data.Functor (($>))
16+import Data.Text as T (Text)
17+import qualified Data.Text.Lazy as TL (pack)
18+import GHC.Generics (Generic)
19+import qualified ProjectM36.Base as Base
20+import ProjectM36.Client
21+ ( AtomExprBase(NakedAtomExpr)
22+ , Atomable(toAddTypeExpr, toAtom)
23+ , AttributeName
24+ , Connection
25+ , ConnectionInfo(InProcessConnectionInfo)
26+ , DatabaseContextExpr
27+ , DatabaseContextExprBase(Delete)
28+ , PersistenceStrategy(NoPersistence)
29+ , RelationalError
30+ , RelationalExprBase(RelationVariable, Restrict)
31+ , RestrictionPredicateExprBase(AttributeEqualityPredicate)
32+ , SessionId
33+ , close
34+ , commit
35+ , connectProjectM36
36+ , createSessionAtHead
37+ , databaseContextExprForUniqueKey
38+ , defaultHeadName
39+ , emptyNotificationCallback
40+ , executeDatabaseContextExpr
41+ , executeRelationalExpr
42+ , withTransaction
43+ )
44+import qualified ProjectM36.Relation as Relation
45+import ProjectM36.Tupleable
46+ ( Tupleable(fromTuple)
47+ , toDefineExpr
48+ , toDeleteExpr
49+ , toInsertExpr
50+ , toUpdateExpr
51+ )
52+import qualified System.Random as R
53+
54+
55+import Control.Monad.IO.Class (MonadIO(liftIO))
56+import qualified Web.Scotty as S
57+
58+-- | This is an example showcasing the updating of data
59+-- with the help of plants. \\
60+-- This is a very simple example and of course not how
61+-- plants grow in nature. \\
62+-- The main goal of this example is to showcase the updating
63+-- of data and the different options of persistence.
64+-- You can just pipe the output from curl into jq:
65+--
66+-- curl -X POST -H 'Accept: application/json' http://localhost:8001/plant/water/angu | jq -r '.stage'
67+
68+
69+data Stage = Seed | Sprout | Seedling | Adult | Dead
70+ deriving (Show, Eq, Ord, Generic, NFData, Atomable)
71+ deriving Serialise via WineryVariant Stage
72+
73+
74+instance ToJSON Stage where -- The where can be removed and the implementation commented out
75+ -- if the ascii values are not wanted
76+ toJSON s = toJSON $ show s <> "\nascii only provided for visualisation:\n" <> stagetoAscii s
77+
78+ toEncoding s = toEncoding $ show s <> "\nascii only provided for visualisation:\n" <> stagetoAscii s
79+
80+instance FromJSON Stage
81+
82+instance S.Parsable Stage where
83+ parseParam t
84+ | t == "seed" || t == "Seed" = Right Seed
85+ | t == "sprout" || t == "Sprout" = Right Sprout
86+ | t == "seedling" || t == "Seedling" = Right Seedling
87+ | t == "adult" || t == "Adult" = Right Adult
88+ | t == "dead" || t == "Dead" = Right Dead
89+ | otherwise = Left t
90+
91+
92+-- Just for ToJSON for ilustration of stage
93+type ASCIIStage = String
94+
95+seedStr :: ASCIIStage
96+seedStr = "<>\n\
97+ \'''\n"
98+sproutStr :: ASCIIStage
99+sproutStr = " ..\n\
100+ \<|>\n\
101+ \''''\n"
102+seedlingStr :: ASCIIStage
103+seedlingStr = " `\\⁄o \n\
104+ \ v|/\n\
105+ \'´;'''\n"
106+adultStr :: ASCIIStage
107+adultStr = "*~(#)~\n\
108+ \ \\,Y,e\n\
109+ \ \\|/\n\
110+ \''+'\\''\n"
111+deadStr :: ASCIIStage
112+deadStr = " ,__:<\n\
113+ \'/'''''\n"
114+
115+-- Just used for ToJSON illustration of stages
116+stagetoAscii :: Stage -> ASCIIStage
117+stagetoAscii Seed = seedStr
118+stagetoAscii Sprout = sproutStr
119+stagetoAscii Seedling = seedlingStr
120+stagetoAscii Adult = adultStr
121+stagetoAscii Dead = deadStr
122+
123+-- used for update stage
124+next :: Stage -> Stage
125+next Seed = Sprout
126+next Sprout = Seedling
127+next Seedling = Adult
128+next s = s
129+
130+data Plant = Plant { name :: Text, species :: Text, stage :: Stage, waterings:: Integer } deriving (Show, Generic)
131+instance Tupleable Plant
132+instance ToJSON Plant
133+instance FromJSON Plant
134+
135+
136+main :: IO ()
137+main = do
138+ putStrLn "Connecting to plant farm"
139+ c <- dbConnection
140+ _ <- createSchema c
141+ putStrLn "Planting some plants"
142+ _ <- insertSampleData c
143+ let port = 8001
144+ putStrLn $ "Started Plant farm at " <> show port
145+ S.scotty port $ do
146+
147+ -- retrieve a plant by name
148+ S.get "/plant/:name" $ do
149+ n <- S.param "name"
150+ e <- liftIO $ getPlant c n
151+ p <- handleWebError e
152+ S.json p
153+
154+
155+ -- save a plant providing it as json data
156+ S.post "/plant" $ do
157+ pl <- S.jsonData :: S.ActionM Plant
158+ e <- liftIO $ savePlant c [pl]
159+ p <- handleWebError e
160+ S.json p
161+
162+ -- updating a plant providing it as json data
163+ S.put "/plant" $ do
164+ pl <- S.jsonData :: S.ActionM Plant
165+ e <- liftIO $ updatePlantFst c pl
166+ p <- handleWebError e
167+ S.json p
168+
169+ -- watering the plant having the provided name.
170+ -- This will water the plant and might let it progress to the next stage. It might also die.
171+ S.post "/plant/water/:name" $ do
172+ n <- S.param "name"
173+ e <- liftIO $ waterPlant c n
174+ p <- handleWebError e
175+ S.json p
176+
177+ -- retriving all the plants as json data
178+ S.get "/plants" $ do
179+ e <- liftIO $ getAllPlants c
180+ ps <- handleWebErrors e
181+ S.json ps
182+
183+ -- saving many plants at the same time
184+ S.post "/plants" $ do
185+ pl <- S.jsonData :: S.ActionM [Plant]
186+ e <- liftIO $ savePlant c pl
187+ p <- handleWebError e
188+ S.json p
189+
190+ -- deleting all plants at a specific stage
191+ S.delete "/plants?stage=:stage" $ do
192+ s <- S.param "stage"
193+ e <- liftIO $ deletePlantsByStage c s
194+ p <- handleWebError e
195+ S.json p
196+
197+ -- deleting all plants at a specific stage
198+ S.delete "/plants" $ do
199+ s <- S.param "name"
200+ e <- liftIO $ deletePlantByName c s
201+ p <- handleWebError e
202+ S.json p
203+
204+ -- deleting all dead plants
205+ S.delete "/plants/clear" $ do
206+ e <- liftIO $ clearDeadPlants c
207+ ps <- handleWebErrors e
208+ S.json ps
209+
210+handleWebError :: Either Err b -> S.ActionM b
211+handleWebError (Left e) = S.raise (TL.pack $ "An error occurred:\n" <> show e)
212+handleWebError (Right v) = pure v
213+
214+handleWebErrors :: [Either Err b] -> S.ActionM [b]
215+handleWebErrors e = do
216+ case lefts e of
217+ [] -> pure (rights e)
218+ l -> S.raise (TL.pack $ "Errors occurred:\n" <> concatMap ((<>"\n") . show) l)
219+
220+
221+-- | watering a plant and thereby possibly updating its stage
222+waterPlant :: DBConnection -> Text -> IO (Either Err Plant)
223+waterPlant db n = do
224+ p <- getPlant db n
225+ case p of
226+ Left e -> pure $ Left e
227+ Right v -> updateStage db $ v { waterings = waterings v + 1 }
228+
229+-- | used by 'waterPlant' updates the stage depending on random numbers
230+updateStage :: DBConnection -> Plant -> IO (Either Err Plant)
231+updateStage db p@(Plant _ _ Dead _ ) = do
232+ tmp <- updatePlantFst db p
233+ case tmp of
234+ Left e -> pure $ Left e
235+ Right _ -> pure $ Right p
236+updateStage db p = do
237+ res <- calculateStage p
238+ tmp <- updatePlantFst db res
239+ case tmp of
240+ Left e -> pure $ Left e
241+ Right _ -> pure $ Right res
242+ where calculateStage p' = do
243+ r1 <- R.randomRIO (1, 10) :: IO Integer
244+ let np = if r1 < waterings p' then p' { stage = next $ stage p', waterings = 0 } else p'
245+ r2 <- R.randomRIO (1, 20)
246+ pure $ if r2 < waterings np then np { stage = Dead, waterings = 0 } else np
247+
248+-- | deletes all plants with Stage = Dead
249+clearDeadPlants :: DBConnection -> IO [Either Err Plant]
250+clearDeadPlants db = do
251+ _ <- deletePlantsByStage db Dead
252+ getAllPlants db
253+
254+
255+-- ****************************
256+-- | *Database functions* :
257+-- ****************************
258+
259+
260+-- | Error type for passing. It is not very specific.
261+-- Just minimal and non optimal for this example.
262+data Err = NotSpecified | NotFound deriving (Show ,Generic)
263+
264+instance ToJSON Err
265+
266+-- | Just for convinience for passing around the SessionId
267+-- and the Connection
268+data DBConnection = DB SessionId Connection
269+
270+
271+-- | Getting plants by their name.\
272+-- Because plant has name as primary key \
273+-- we can assume will get at most one result. \
274+-- Alternatively we could return a list.
275+getPlant :: DBConnection -> Text -> IO (Either Err Plant)
276+getPlant db n = defaultHead (Left NotFound) <$> (
277+ get db
278+ ( Restrict -- Restrict can be thought of as similar to "WITH" in SQL
279+ (AttributeEqualityPredicate "name" (NakedAtomExpr (toAtom n))) -- This is the Predicate we are "restricting" our RelationalExprBase with
280+ (RelationVariable "plants" ())
281+ )
282+ :: IO [Either Err Plant] -- this is needed because our 'get' function is
283+ )
284+
285+defaultHead :: a -> [a] -> a
286+defaultHead d [] = d
287+defaultHead _ (x:_) = x
288+
289+-- | Getting all the plants
290+getAllPlants :: DBConnection -> IO [Either Err Plant]
291+getAllPlants db = get db (RelationVariable "plants" ())
292+
293+-- | Getting all the plants that satisfy the restrictions
294+getAllPlantsWith :: DBConnection -> Base.RestrictionPredicateExpr -> IO [Either Err Plant]
295+getAllPlantsWith db ex = get db (Restrict ex (RelationVariable "plants" ()))
296+
297+
298+-- | Saving a plant
299+savePlant :: (Traversable t) => DBConnection -> t Plant -> IO (Either Err ())
300+savePlant db sps = insert db sps "plants"
301+
302+-- | An alternative to update alone because due to updates
303+-- not being cached yet \
304+-- they have to be calculated every update. \
305+-- This seems like an alternative until caching is implemented.
306+updatePlantFst :: DBConnection -> Plant -> IO (Either Err ())
307+updatePlantFst db pln = do
308+ _ <- delete db pln ["name"] "plants"
309+ savePlant db [pln]
310+
311+-- | Updating a plant. Due to the way project 36 works, \
312+-- updates have to be executed every time.\
313+-- This is slow but won't be an issue soon because they will
314+-- be cached.\
315+-- But because of this project 36 can provide O(1) commits.
316+updatePlant :: DBConnection -> Plant -> IO (Either Err ())
317+updatePlant db sps = update
318+ db -- db connection
319+ sps -- plant value
320+ ["name"] -- the attributes to be updated by (in case of unique key)
321+ "plants" -- the relation we want to update on
322+
323+
324+-- | deleting all plants that have given name.
325+deletePlantByName :: DBConnection -> Text -> IO (Either Err ())
326+deletePlantByName db s = executeWithTransaction db $ Right $ Delete "plants" $ AttributeEqualityPredicate "name" (NakedAtomExpr (toAtom s))
327+
328+-- | deleting all plants that have given stage.
329+deletePlantsByStage :: DBConnection -> Stage -> IO (Either Err ())
330+deletePlantsByStage db s = executeWithTransaction db $ Right $ Delete "plants" $ AttributeEqualityPredicate "stage" (NakedAtomExpr (toAtom s))
331+
332+
333+-- | Inserting the schema into the DB
334+createSchema :: DBConnection -> IO ()
335+createSchema (DB sessionId conn) = do
336+ _ <- handleIOErrorsAndQuit $ mapM (executeDatabaseContextExpr sessionId conn) [
337+ toAddTypeExpr (Proxy :: Proxy Stage) -- Adds the Type Stage as data to the DB
338+ , toDefineExpr (Proxy :: Proxy Plant) "plants" -- Creates the plants relation
339+ , databaseContextExprForUniqueKey "plants" ["name"] -- Makes name of the plants relation a uniqe Key,
340+ -- Foreign Key restrictions are available too
341+ ]
342+ pure ()
343+
344+
345+-- | inserting some sample data
346+insertSampleData :: DBConnection -> IO (Either Err ())
347+insertSampleData (DB sid conn) = do
348+ insert (DB sid conn) [
349+ Plant "angu" "Caladenia angustata" Seed 0
350+ , Plant "thely" "Thelymitra alcockiae" Seed 0
351+ , Plant "monstera" "Araceae" Seed 0
352+ ] "plants"
353+
354+dbConnection :: IO DBConnection
355+dbConnection = do
356+ -- connect to the database
357+ let connInfo = InProcessConnectionInfo NoPersistence emptyNotificationCallback []
358+ -- The code below persists the data in a DB with the name "base". \\
359+-- let connInfo = InProcessConnectionInfo (CrashSafePersistence "base") emptyNotificationCallback [] \\
360+ -- In addition minimal persistance is available. \\
361+-- let connInfo = InProcessConnectionInfo (MinimalPersistence "base") emptyNotificationCallback []
362+ conn <- handleIOErrorAndQuit $ connectProjectM36 connInfo
363+ --create a database session at the default branch of the database
364+ sessionId <- handleIOErrorAndQuit $ createSessionAtHead conn defaultHeadName
365+ pure (DB sessionId conn)
366+
367+
368+-- | A polymorphic function to insert data (a traversable of data) into the DB
369+insert :: (Tupleable a, Traversable t) => DBConnection -> t a -> Base.RelVarName -> IO (Either Err ())
370+insert db rlv rlvName = executeWithTransaction db $ toInsertExpr rlv rlvName
371+
372+-- | A polymorphic function to update data in the DB.
373+-- An update in one funtion would take:
374+--
375+-- - SessionId
376+-- - Connection
377+-- - Tuplable a -- the Tuplable you want to update
378+-- - [AttributeName] -- the Attributes of the Tuplable you want to update those are of StringType
379+-- - RelVarName -- the name of the relation
380+--
381+-- With that you can via 'toUpdateExpr' create a 'DatabaseContextExpr' to be executed. \\
382+-- For inserting its very similarly done with 'toInsertExpr'.
383+update :: (Tupleable a) => DBConnection -> a -> [AttributeName]-> Base.RelVarName -> IO (Either Err ())
384+update db rlv attr rlvName = executeWithTransaction db $ toUpdateExpr rlvName attr rlv
385+
386+-- | A polymorphic function to delete data in the DB
387+delete :: (Tupleable a) => DBConnection -> a -> [AttributeName]-> Base.RelVarName -> IO (Either Err ())
388+delete db rlv attr rlvName = executeWithTransaction db $ toDeleteExpr rlvName attr rlv
389+
390+-- | A convenience function to make executing DBContextExpr with commiting simpler. \\
391+-- In particular for expr that just insert, delete and update.
392+-- Therefor ultimately return Either _ ()
393+executeWithTransaction :: DBConnection -> Either RelationalError DatabaseContextExpr -> IO (Either Err ())
394+executeWithTransaction (DB sid conn) expr = do
395+ iEx <- handleError expr
396+ case iEx of
397+ Left e -> pure $ Left e
398+ Right v -> handleIOError $ withTransaction sid conn (executeDatabaseContextExpr sid conn v) (commit sid conn)
399+
400+-- | A polymorphic function to get data (a list of data and possibly errors) from the DB
401+get :: Tupleable b => DBConnection -> Base.RelationalExpr -> IO [Either Err b]
402+get (DB sessionId conn) q = do
403+ eRel <- executeRelationalExpr sessionId conn q
404+ e <- handleError eRel
405+ case e of
406+ Left err -> pure [Left err]
407+ Right pRel -> do
408+ ws <- Relation.toList pRel
409+ mapM (handleError . fromTuple) ws
410+
411+-- | for closing the DB connection.
412+-- Not really needed when using in-memory DB
413+closeConn :: DBConnection -> IO ()
414+closeConn (DB _ conn) = close conn
415+
416+
417+-- | Error handling is heavily inspired by 'blog.hs' the blog example \\
418+-- by (agentm)[https://github.com/agentm] (https://github.com/agentm/project-m36, commit: f8432522adaafeae7c32bc2b8b6cb09c00396fc6). \\
419+-- As stated there, your application should have proper error handling.
420+handleIOErrorAndQuit :: Show e => IO (Either e a) -> IO a
421+handleIOErrorAndQuit m = do
422+ v <- m
423+ handleErrorAndQuit v
424+
425+handleError :: Show e => Either e a -> IO (Either Err a)
426+handleError eErr = case eErr of
427+ Left err -> print err $> Left NotSpecified
428+ Right v -> pure $ Right v
429+
430+handleIOError :: Show e => IO (Either e a) -> IO (Either Err a)
431+handleIOError m = do
432+ v <- m
433+ handleError v
434+
435+handleErrorAndQuit :: Show e => Either e a -> IO a
436+handleErrorAndQuit eErr = case eErr of
437+ Left err -> print err >> error "Quit."
438+ Right v -> pure v
439+
440+handleIOErrorsAndQuit :: Show e => IO [Either e a] -> IO [a]
441+handleIOErrorsAndQuit m = do
442+ eErrs <- m
443+ case lefts eErrs of
444+ [] -> pure (rights eErrs)
445+ err:_ -> handleErrorAndQuit (Left err)
446+
examples/SimpleClient.hs+10−10
@@ -1,39 +1,39 @@
11import ProjectM36.Client
22import ProjectM36.TupleSet
3−import ProjectM36.Base
43import ProjectM36.Relation.Show.Term
4+import Data.Text.IO as TIO
55
66main :: IO ()
77main = do
88 -- 1. create a ConnectionInfo
9− let connInfo = RemoteProcessConnectionInfo "mytestdb" (createNodeId "127.0.0.1" defaultServerPort) emptyNotificationCallback
9+ let connInfo = RemoteConnectionInfo "mytestdb" "127.0.0.1" (show defaultServerPort) emptyNotificationCallback
1010 -- 2. conncted to the remote database
1111 eConn <- connectProjectM36 connInfo
1212 case eConn of
13− Left err -> putStrLn (show err)
13+ Left err -> print err
1414 Right conn -> do
1515 --3. create a session on the "master" branch
16− eSessionId <- createSessionAtHead "master" conn
16+ eSessionId <- createSessionAtHead conn "master"
1717 case eSessionId of
18− Left err -> putStrLn (show err)
18+ Left err -> print err
1919 Right sessionId -> do
2020 --4. define a new relation variable with a DatabaseContext expression
2121 let attrList = [Attribute "name" TextAtomType,
2222 Attribute "age" IntAtomType]
2323 attrs = attributesFromList attrList
2424 mErr1 <- executeDatabaseContextExpr sessionId conn (Define "person" (map NakedAttributeExpr attrList))
25− putStrLn (show mErr1)
25+ print mErr1
2626 --5. add a tuple to the relation referenced by the relation variable
2727 let (Right tupSet) = mkTupleSetFromList attrs [[TextAtom "Bob", IntAtom 45]]
2828 mErr2 <- executeDatabaseContextExpr sessionId conn (Insert "person" (MakeStaticRelation attrs tupSet))
29− putStrLn (show mErr2)
29+ print mErr2
3030
3131 --6. execute a relational algebra query
3232 let restrictionPredicate = AttributeEqualityPredicate "name" (NakedAtomExpr (TextAtom "Steve"))
33− eRel <- executeRelationalExpr sessionId conn (Restrict restrictionPredicate (RelationVariable "person"))
33+ eRel <- executeRelationalExpr sessionId conn (Restrict restrictionPredicate (RelationVariable "person" ()))
3434 case eRel of
35− Left err -> putStrLn (show err)
36− Right rel -> putStrLn (show $ showRelation rel)
35+ Left err -> print err
36+ Right rel -> TIO.putStrLn (showRelation rel)
3737
3838 --7. close the connection
3939 close conn
examples/blog.hsnew file+221
@@ -0,0 +1,221 @@
1+-- a simple example of a blog schema
2+{-# LANGUAGE DeriveAnyClass, DeriveGeneric, OverloadedStrings, CPP, DerivingVia #-}
3+
4+import ProjectM36.Client
5+import ProjectM36.Base
6+import ProjectM36.Relation
7+import ProjectM36.Tupleable
8+import ProjectM36.Atom (relationForAtom)
9+import ProjectM36.Tuple (atomForAttributeName)
10+
11+import Data.Either
12+import GHC.Generics
13+import qualified Data.Text as T
14+import qualified Data.Text.Lazy as TL
15+import Data.Time.Clock
16+import Data.Time.Calendar
17+import Control.DeepSeq
18+import Data.Proxy
19+#if __GLASGOW_HASKELL__ < 804
20+import Data.Monoid
21+#endif
22+import Data.List
23+import Control.Monad (when, forM_)
24+import Codec.Winery
25+
26+import Web.Scotty as S
27+import Text.Blaze.Html5 (h1, h2, h3, p, form, input, (!), toHtml, Html, a, toValue, hr, textarea)
28+import Text.Blaze.Html5.Attributes (name, href, type_, method, action, value)
29+import Text.Blaze.Html.Renderer.Text
30+import Control.Monad.IO.Class (liftIO)
31+import Network.HTTP.Types.Status
32+import Data.Time.Format
33+
34+--define your data types
35+data Blog = Blog {
36+ title :: T.Text,
37+ entry :: T.Text,
38+ tstamp :: UTCTime,
39+ category :: Category --note that this type is an algebraic data type
40+ }
41+ deriving (Generic, Show) --derive Generic so that Tupleable can use default instances
42+
43+--instantiate default Tupleable instances
44+instance Tupleable Blog
45+
46+data Comment = Comment {
47+ blogTitle :: T.Text,
48+ commentTime :: UTCTime,
49+ contents :: T.Text
50+ } deriving (Generic, Show)
51+
52+instance Tupleable Comment
53+
54+data Category = Food | Cats | Photos | Other T.Text -- note that this data type could not be represented by an "enumeration" as found in SQL databases
55+ deriving (Atomable, Eq, Show, NFData, Generic) -- derive Atomable so that values of this type can be stored as a database value
56+ deriving Serialise via WineryVariant Category -- derive Serialisable to be able to transmit this data remotely
57+
58+-- add some short-hand error handling- your application should have proper handling
59+handleIOError :: Show e => IO (Either e a) -> IO a
60+handleIOError m = do
61+ v <- m
62+ handleError v
63+
64+handleError :: Show e => Either e a -> IO a
65+handleError eErr = case eErr of
66+ Left err -> print err >> error "Died due to errors."
67+ Right v -> pure v
68+
69+handleIOErrors :: Show e => IO [Either e a] -> IO [a]
70+handleIOErrors m = do
71+ eErrs <- m
72+ case lefts eErrs of
73+ [] -> pure (rights eErrs)
74+ err:_ -> handleError (Left err)
75+
76+main :: IO ()
77+main = do
78+ --connect to the database
79+ let connInfo = InProcessConnectionInfo NoPersistence emptyNotificationCallback []
80+ conn <- handleIOError $ connectProjectM36 connInfo
81+
82+ sessionId <- handleIOError $ createSessionAtHead conn "master"
83+
84+ createSchema sessionId conn
85+ insertSampleData sessionId conn
86+ --create the web routes
87+ scotty 3000 $ do
88+ S.get "/" (listBlogs sessionId conn)
89+ S.get "/blog/:blogid" (showBlogEntry sessionId conn)
90+ S.post "/comment" (addComment sessionId conn)
91+
92+--define the schema with the new Category atom (data) type, blog relvar, a comment relvar, and a foreign key relationship between them
93+createSchema :: SessionId -> Connection -> IO ()
94+createSchema sessionId conn = do
95+ _ <- handleIOErrors $ mapM (executeDatabaseContextExpr sessionId conn) [
96+ toAddTypeExpr (Proxy :: Proxy Category),
97+ toDefineExpr (Proxy :: Proxy Blog) "blog",
98+ toDefineExpr (Proxy :: Proxy Comment) "comment",
99+ databaseContextExprForForeignKey "blog_comment" ("comment", ["blogTitle"]) ("blog", ["title"]),
100+ databaseContextExprForUniqueKey "blog" ["title"]
101+ ]
102+ pure ()
103+
104+--create some sample values and insert them into the database's relation variables
105+insertSampleData :: SessionId -> Connection -> IO ()
106+insertSampleData sessionId conn = do
107+ let blogs = [Blog { title = "Haskell Lenses",
108+ entry = "I wear Haskell rose-colored lenses.",
109+ tstamp = UTCTime (fromGregorian 2017 5 8) (secondsToDiffTime 1000),
110+ category = Food },
111+ Blog { title = "Haskell Monad Analogy",
112+ entry = "Monads are like burritos going through intestines.",
113+ tstamp = UTCTime (fromGregorian 2017 6 10) (secondsToDiffTime 2000),
114+ category = Cats }
115+ ]
116+ comments = [Comment { blogTitle = "Haskell Lenses",
117+ commentTime = UTCTime (fromGregorian 2017 7 8) (secondsToDiffTime 3000),
118+ contents = "You suck!" },
119+ Comment {blogTitle = "Haskell Lenses",
120+ commentTime = UTCTime (fromGregorian 2017 7 9) (secondsToDiffTime 2000),
121+ contents = "I find your ideas intriguing and would like to subscribe to your newsletter."}
122+ ]
123+ insertBlogsExpr <- handleError $ toInsertExpr blogs "blog"
124+ handleIOError $ executeDatabaseContextExpr sessionId conn insertBlogsExpr
125+
126+ insertCommentsExpr <- handleError $ toInsertExpr comments "comment"
127+ handleIOError $ executeDatabaseContextExpr sessionId conn insertCommentsExpr
128+
129+-- handle relational errors with scotty
130+handleWebError :: Either RelationalError a -> ActionM a
131+handleWebError (Left err) = render500 (toHtml (show err)) >> pure (error "bad")
132+handleWebError (Right v) = pure v
133+
134+-- show a page with all the blog entries
135+listBlogs :: SessionId -> Connection -> ActionM ()
136+listBlogs sessionId conn = do
137+ eRel <- liftIO $ executeRelationalExpr sessionId conn (RelationVariable "blog" ())
138+ case eRel of
139+ Left err -> render500 (toHtml (show err))
140+ Right blogRel -> do
141+ blogs <- liftIO (toList blogRel) >>= mapM (handleWebError . fromTuple) :: ActionM [Blog]
142+ let sortedBlogs = sortBy (\b1 b2 -> tstamp b1 `compare` tstamp b2) blogs
143+ html . renderHtml $ do
144+ h1 "Blog Posts"
145+ forM_ sortedBlogs $ \blog -> a ! href (toValue $ "/blog/" <> title blog) $ h2 (toHtml (title blog))
146+
147+render500 :: Html -> ActionM ()
148+render500 msg = do
149+ html . renderHtml $ do
150+ h1 "Internal Server Error"
151+ p msg
152+ status internalServerError500
153+
154+--display one blog post along with its comments
155+showBlogEntry :: SessionId -> Connection -> ActionM ()
156+showBlogEntry sessionId conn = do
157+ blogid <- param "blogid"
158+ --query the database to return the blog entry with a relation-valued attribute of the associated comments
159+ let blogRestrictionExpr = AttributeEqualityPredicate "title" (NakedAtomExpr (TextAtom blogid))
160+ extendExpr = AttributeExtendTupleExpr "comments" (RelationAtomExpr commentsRestriction)
161+ commentsRestriction = Restrict
162+ (AttributeEqualityPredicate "blogTitle" (AttributeAtomExpr "title"))
163+ (RelationVariable "comment" ())
164+ eRel <- liftIO $ executeRelationalExpr sessionId conn (Extend extendExpr
165+ (Restrict
166+ blogRestrictionExpr
167+ (RelationVariable "blog" ())))
168+ let render = html . renderHtml
169+ formatStamp = formatTime defaultTimeLocale (iso8601DateFormat (Just "%H:%M:%S"))
170+ case eRel of
171+ Left err -> render500 (toHtml (show err))
172+ --handle successful query execution
173+ Right rel -> case singletonTuple rel of
174+ Nothing -> do --no results for this blog id
175+ render (h1 "No such blog post")
176+ status status404
177+ Just blogTuple -> case fromTuple blogTuple of --just one blog post found- it's a match!
178+ Left err -> render500 (toHtml (show err))
179+ Right blog -> do
180+ --extract comments for the blog
181+ commentsAtom <- handleWebError (atomForAttributeName "comments" blogTuple)
182+ commentsRel <- handleWebError (relationForAtom commentsAtom)
183+ comments <- liftIO (toList commentsRel) >>= mapM (handleWebError . fromTuple) :: ActionM [Comment]
184+ let commentsSorted = sortBy (\c1 c2 -> commentTime c1 `compare` commentTime c2) comments
185+ render $ do
186+ --show blog details
187+ h1 (toHtml (title blog))
188+ p (toHtml ("Posted at " <> formatStamp (tstamp blog) <> " under " <> show (category blog)))
189+ p (toHtml (entry blog))
190+ hr
191+ h3 "Comments"
192+ --list the comments
193+ forM_ commentsSorted $ \comment -> do
194+ p (toHtml ("Commented at " <> formatStamp (commentTime comment)))
195+ p (toHtml (contents comment))
196+ when (null comments) (p "No comments.")
197+ --add a comment form
198+ h3 "Add a Comment"
199+ form ! method "POST" ! action "/comment" $ do
200+ input ! type_ "hidden" ! name "blogid" ! value (toValue blogid)
201+ textarea ! name "contents" $ ""
202+ input ! type_ "submit"
203+
204+--add a comment to a blog post
205+addComment :: SessionId -> Connection -> ActionM ()
206+addComment sessionId conn = do
207+ blogid <- param "blogid"
208+ commentText <- param "contents"
209+ now <- liftIO getCurrentTime
210+
211+ case toInsertExpr [Comment {blogTitle = blogid,
212+ commentTime = now,
213+ contents = commentText }] "comment" of
214+ Left err -> handleWebError (Left err)
215+ Right insertExpr -> do
216+ eRet <- liftIO (withTransaction sessionId conn (executeDatabaseContextExpr sessionId conn insertExpr) (commit sessionId conn))
217+ case eRet of
218+ Left err -> handleWebError (Left err)
219+ Right _ ->
220+ redirect (TL.fromStrict ("/blog/" <> blogid))
221+
examples/hair.hsnew file+44
@@ -0,0 +1,44 @@
1+{-# LANGUAGE DeriveGeneric, DeriveAnyClass, OverloadedStrings, DerivingVia #-}
2+import ProjectM36.Client
3+import ProjectM36.Relation.Show.Term
4+import GHC.Generics
5+import Data.Text
6+import Control.DeepSeq
7+import qualified Data.Map as M
8+import qualified Data.Text.IO as TIO
9+import Data.Proxy
10+import Codec.Winery
11+
12+data Hair = Bald | Brown | Blond | OtherColor Text
13+ deriving (Generic, Show, Eq, NFData, Atomable)
14+ deriving Serialise via WineryVariant Hair
15+
16+main :: IO ()
17+main = do
18+ --connect to the database
19+ let connInfo = InProcessConnectionInfo NoPersistence emptyNotificationCallback []
20+ eCheck v = do
21+ x <- v
22+ case x of
23+ Left err -> error (show err)
24+ Right x' -> pure x'
25+ conn <- eCheck $ connectProjectM36 connInfo
26+
27+ --create a database session at the default branch of the fresh database
28+ sessionId <- eCheck $ createSessionAtHead conn "master"
29+
30+ --create the data type in the database context
31+ eCheck $ executeDatabaseContextExpr sessionId conn (toAddTypeExpr (Proxy :: Proxy Hair))
32+
33+ --create a relation with the new Hair AtomType
34+ let blond = NakedAtomExpr (toAtom Blond)
35+ eCheck $ executeDatabaseContextExpr sessionId conn
36+ (Assign "people"
37+ (MakeRelationFromExprs Nothing $ TupleExprs () [
38+ TupleExpr (M.fromList [("hair", blond), ("name", NakedAtomExpr (TextAtom "Colin"))])]))
39+
40+ let restrictionPredicate = AttributeEqualityPredicate "hair" blond
41+ peopleRel <- eCheck $ executeRelationalExpr sessionId conn (Restrict restrictionPredicate (RelationVariable "people" ()))
42+
43+ TIO.putStrLn (showRelation peopleRel)
44+
examples/out_of_the_tarpit.hs+239−59
@@ -1,84 +1,264 @@
11-- the Out-of-the-Tarpit example in Haskell and Project:M36
2−{-# LANGUAGE DeriveAnyClass #-}
2+{-# LANGUAGE DeriveAnyClass, DeriveGeneric, OverloadedStrings, DerivingVia #-}
33import ProjectM36.Client
4+import ProjectM36.DataTypes.Primitive
5+import ProjectM36.Tupleable
6+import ProjectM36.Relation
7+import ProjectM36.Error
8+import Data.Either
9+import GHC.Generics
10+import Control.DeepSeq
411import qualified Data.Text as T
5−import ProjectM36.Atom
12+import Data.Time.Calendar
613import Data.Proxy
14+import Codec.Winery
715
8−type Text = T.Text
9−
10−--custom types cannot yet be made due to hardcoding in the Atom Binary implementation
11−type Address = Text
12−type Agent = Text
13−type Name = Text
16+--create various database value (atom) types
1417type Price = Double
15−type FileName = Text
16−data RoomType = Kitchen | Bathroom | LivingRoom deriving (Atomable)
17−roomTypeAtomType = atomTypeForProxy (Proxy :: RoomType)
1818
19−data PriceBand = Low | Medium | High | Premium
20−priceBandAtomType = atomTypeForProxy (Proxy :: PriceBand)
19+type Name = T.Text
20+
21+type Address = T.Text
2122
23+data RoomType = Kitchen | Bathroom | LivingRoom
24+ deriving (Generic, Atomable, Eq, Show, NFData)
25+ deriving Serialise via WineryVariant RoomType
26+
27+data PriceBand = Low | Medium | High | Premium
28+ deriving (Generic, Atomable, Eq, Show, NFData)
29+ deriving Serialise via WineryVariant PriceBand
30+
2231data AreaCode = City | Suburban | Rural
23−areaCodeAtomType = atomTypeForProxy (Proxy :: AreaCode)
32+ deriving (Generic, Atomable, Eq, Show, NFData)
33+ deriving Serialise via WineryVariant AreaCode
2434
25−data SpeedBand = VeryFastBand | FastBand | MediumBand | SlowBand
26−speedBandAtomType = atomTypeForProxy (Proxy :: SpeedBand)
35+data SpeedBand = VeryFastBand | FastBand | MediumBand | SlowBand
36+ deriving (Generic, Atomable, Eq, Show, NFData)
37+ deriving Serialise via WineryVariant SpeedBand
2738
28−
2939main :: IO ()
3040main = do
31− let connInfo = InProcessConnectionInfo emptyNotificationCallback
41+ --connect to the database
42+ let connInfo = InProcessConnectionInfo NoPersistence emptyNotificationCallback []
3243 check x = case x of
3344 Left err -> error (show err)
3445 Right x' -> x'
3546 eConn <- connectProjectM36 connInfo
3647 let conn = check eConn
3748
38− eSessionId <- createSessionAtHead "master" conn
49+ --create a database session at the default branch of the fresh database
50+ eSessionId <- createSessionAtHead conn "master"
3951 let sessionId = check eSessionId
40−
52+
4153 createSchema sessionId conn
54+ insertSampleData sessionId conn
55+
56+data Property = Property {
57+ address :: T.Text,
58+ price :: Price,
59+ photo :: T.Text,
60+ dateRegistered :: Day
61+ }
62+ deriving (Generic, Eq, Show)
63+
64+instance Tupleable Property
65+
66+data Offer = Offer {
67+ offerAddress :: Address,
68+ offerPrice :: Price,
69+ offerDate :: Day,
70+ bidderName :: Name,
71+ bidderAddress :: Address,
72+ decisionDate :: Day,
73+ accepted :: Bool
74+ }
75+ deriving (Generic, Eq)
76+
77+instance Tupleable Offer
78+
79+data Decision = Decision {
80+ decAddress :: Address,
81+ decOfferDate :: Day, --the dec prefix is needed until OverloadedRecordFields is available
82+ decBidderName :: Name,
83+ decBidderAddress :: Address,
84+ decDecisionDate :: Day,
85+ decAccepted :: Bool
86+ }
87+ deriving (Generic, Eq)
88+
89+instance Tupleable Decision
90+
91+data Room = Room {
92+ roomAddress :: Address,
93+ roomName :: Name,
94+ width :: Double,
95+ breadth :: Double,
96+ roomType :: RoomType
97+ }
98+ deriving (Generic, Eq)
99+
100+instance Tupleable Room
101+
102+data Floor = Floor {
103+ floorAddress :: Address,
104+ floorRoomName :: Name,
105+ floorNum :: Integer
106+ }
107+ deriving (Generic, Eq)
108+
109+instance Tupleable Floor
110+
111+data Commission = Commission {
112+ priceBand :: PriceBand,
113+ areaCode :: AreaCode,
114+ saleSpeed :: SpeedBand,
115+ commission :: Price
116+ } deriving (Generic, Eq)
117+
118+instance Tupleable Commission
119+
120+createSchema :: SessionId -> Connection -> IO ()
121+createSchema sessionId conn = do
122+ --create attributes for relvars
123+ let
124+ --create uniqueness constraints
125+ incDepKeys = map (uncurry databaseContextExprForUniqueKey)
126+ [("property", ["address"]),
127+ ("offer", ["offerAddress", "offerDate", "bidderName", "bidderAddress"]),
128+ ("decision", ["decAddress", "decOfferDate", "decBidderName", "decBidderAddress"]),
129+ ("room", ["roomAddress", "roomName"]),
130+ ("floor", ["floorAddress", "floorRoomName"]),
131+ --"commision" misspelled in OotT
132+ ("commission", ["priceBand", "areaCode", "saleSpeed"])
133+ ]
134+ --create foreign key constraints
135+ foreignKeys = [("offer_property_fk",
136+ ("offer", ["offerAddress"]),
137+ ("property", ["address"])),
138+ ("decision_offer_fk",
139+ ("decision", ["decAddress", "decOfferDate", "decBidderName", "decBidderAddress"]),
140+ ("offer", ["offerAddress", "offerDate", "bidderName", "bidderAddress"])),
141+ ("room_property_fk",
142+ ("room", ["roomAddress"]),
143+ ("property", ["address"])),
144+ ("floor_property_fk",
145+ ("floor", ["floorAddress"]),
146+ ("property", ["address"]))
147+ ]
148+ incDepForeignKeys = map (\(n, a, b) -> databaseContextExprForForeignKey n a b) foreignKeys
149+ --define the relvars
150+ rvExprs = [toDefineExpr (Proxy :: Proxy Property) "property",
151+ toDefineExpr (Proxy :: Proxy Offer) "offer",
152+ toDefineExpr (Proxy :: Proxy Decision) "decision",
153+ toDefineExpr (Proxy :: Proxy Room) "room",
154+ toDefineExpr (Proxy :: Proxy Floor) "floor",
155+ toDefineExpr (Proxy :: Proxy Commission) "commission"]
156+ --create the new algebraic data types
157+ new_adts = [toAddTypeExpr (Proxy :: Proxy RoomType),
158+ toAddTypeExpr (Proxy :: Proxy PriceBand),
159+ toAddTypeExpr (Proxy :: Proxy AreaCode),
160+ toAddTypeExpr (Proxy :: Proxy SpeedBand)]
161+ --create the stored atom functions
162+ priceBandScript = "(\\(DoubleAtom price:_) -> do\n let band = if price < 10000.0 then \"Low\" else if price < 20000.0 then \"Medium\" else if price < 30000.0 then \"High\" else \"Premium\"\n let aType = ConstructedAtomType \"PriceBand\" empty\n pure (ConstructedAtom band aType [])) :: [Atom] -> Either AtomFunctionError Atom"
163+ areaCodeScript = "(\\(TextAtom address:_) -> let aType = ConstructedAtomType \"AreaCode\" empty in if address == \"90210\" then pure (ConstructedAtom \"City\" aType []) else pure (ConstructedAtom \"Rural\" aType [])) :: [Atom] -> Either AtomFunctionError Atom"
164+ speedBandScript = "(\\(DayAtom d1:DayAtom d2:_) -> do\n let aType = ConstructedAtomType \"SpeedBand\" empty\n (_, month1, _) = toGregorian d1\n (_, month2, _) = toGregorian d2\n if month1 == 11 && month2 == 11 then pure (ConstructedAtom \"VeryFast\" aType []) else pure (ConstructedAtom \"MediumBand\" aType [])) :: [Atom] -> Either AtomFunctionError Atom"
165+ atomFuncs = [createScriptedAtomFunction "priceBandForPrice" [doubleTypeConstructor] (ADTypeConstructor "PriceBand" []) priceBandScript,
166+ createScriptedAtomFunction "areaCodeForAddress" [textTypeConstructor] (ADTypeConstructor "AreaCode" []) areaCodeScript,
167+ createScriptedAtomFunction "datesToSpeedBand" [dayTypeConstructor, dayTypeConstructor] (ADTypeConstructor "SpeedBand" []) speedBandScript
168+ ]
169+ --gather up and execute all database updates
170+ putStrLn "load relvars"
171+ _ <- handleIOErrors $ mapM (executeDatabaseContextExpr sessionId conn) (new_adts ++ rvExprs ++ incDepKeys ++ incDepForeignKeys)
42172
43−createSchema :: Connection -> IO ()
44−createSchema conn = do
45− let propertyAttrs = [Attribute "address" addressAtomType,
46− Attribute "price" priceAtomType
47− Attribute "photo" fileNameAtomType,
48− Attribute "dateRegistered" dateAtomType]
49− offerAttrs = [Attribute "address" addressAtomType,
50− Attribute "offerPrice" priceAtomType,
51− Attribute "offerDate" dateAtomType,
52− Attribute "bidderName" nameAtomType,
53− Attribute "bidderAddress" addressAtomType,
54− Attribute "decisionDate" dateAtomType,
55− Attribute "accepted" boolAtomType]
56− decisionAttrs = [Attribute "address" addressAtomType,
57− Attribute "offerDate" dateAtomType,
58− Attribute "bidderName" nameAtomType,
59− Attribute "bidderAddress" addressAtomType,
60− Attribute "decisionDate" dateAtomType,
61− Attribute "accepted" boolAtomType]
62− roomAttrs = [Attribute "address" addressAtomType,
63− Attribute "roomName" stringAtomType,
64− Attribute "width" doubleAtomType,
65− Attribute "breadth" doubleAtomType,
66− Attribute "type" roomTypeAtomType]
67− floorAttrs = [Attribute "address" addressAtomType,
68− Attribute "roomName" stringAtomType,
69− Attribute "floor" intAtomType]
70− commissionAttrs = [Attribute "priceBand" priceBandAtomType,
71− Attribute "areaCode" areaCodeAtomType,
72− Attribute "saleSpeed" speedBandAtomType,
73− Attribute "commission" doubleAtomType]
74− relvarMap = [("property", propertyAttrs),
75− ("offer", offerAttrs),
76− ("decision", decisionAttrs),
77− ("room", roomAttrs),
78− ("floor", floorAttrs),
79− ("commission", commissionAttrs)]
80− dbcontextExprs = map (\(name, attrs) -> Define name (attributesFromList attrs)) relvarMap
81− mapM executeDatabaseContextExpr dbcontextExprs
173+ putStrLn "load atom functions"
174+ _ <- handleIOErrors $ mapM (executeDatabaseContextIOExpr sessionId conn) atomFuncs
175+ pure ()
176+
177+insertSampleData :: SessionId -> Connection -> IO ()
178+insertSampleData sessionId conn = do
179+ --insert a bunch of records
180+ putStrLn "load data"
181+ let properties = [Property { address = "123 Main St.",
182+ price = 200000,
183+ photo = "123_main.jpg",
184+ dateRegistered = fromGregorian 2016 4 3},
185+ Property { address = "456 Main St.",
186+ price = 150000,
187+ photo = "456_main.jpg",
188+ dateRegistered = fromGregorian 2016 5 6}]
189+ insertPropertiesExpr <- handleError $ toInsertExpr properties "property"
190+ handleIOError $ executeDatabaseContextExpr sessionId conn insertPropertiesExpr
82191
192+ let offers = [Offer { offerAddress = "123 Main St.",
193+ offerPrice = 180000,
194+ offerDate = fromGregorian 2017 1 2,
195+ bidderName = "Steve",
196+ bidderAddress = "789 Main St.",
197+ decisionDate = fromGregorian 2017 2 2,
198+ accepted = False }]
83199
200+ insertOffersExpr <- handleError $ toInsertExpr offers "offer"
201+ handleIOError $ executeDatabaseContextExpr sessionId conn insertOffersExpr
202+
203+ let rooms = [Room { roomAddress = "123 Main St.",
204+ roomName = "Fabulous Kitchen",
205+ width = 10,
206+ breadth = 10,
207+ roomType = Kitchen },
208+ Room { roomAddress = "123 Main St.",
209+ roomName = "Clean Bathroom",
210+ width = 7,
211+ breadth = 5,
212+ roomType = Bathroom }]
213+
214+ insertRoomsExpr <- handleError $ toInsertExpr rooms "room"
215+ handleIOError $ executeDatabaseContextExpr sessionId conn insertRoomsExpr
216+
217+ let decisions = [Decision { decAddress = "123 Main St.",
218+ decOfferDate = fromGregorian 2017 1 2,
219+ decBidderName = "Steve",
220+ decBidderAddress = "789 Main St.",
221+ decDecisionDate = fromGregorian 2017 05 04,
222+ decAccepted = False }]
223+ insertDecisionsExpr <- handleError $ toInsertExpr decisions "decision"
224+ handleIOError $ executeDatabaseContextExpr sessionId conn insertDecisionsExpr
225+
226+ let floors = [Floor { floorAddress = "123 Main St.",
227+ floorRoomName = "Bathroom",
228+ floorNum = 1
229+ }]
230+ insertFloorsExpr <- handleError $ toInsertExpr floors "floor"
231+ handleIOError $ executeDatabaseContextExpr sessionId conn insertFloorsExpr
232+
233+ let commissions = [Commission { priceBand = Medium,
234+ areaCode = City,
235+ saleSpeed = MediumBand,
236+ commission = 10000 }]
237+ insertCommissionsExpr <- handleError $ toInsertExpr commissions "commission"
238+ handleIOError $ executeDatabaseContextExpr sessionId conn insertCommissionsExpr
239+
240+ --query some records, marshal them back to Haskell
241+
242+ properties' <- handleIOError $ executeRelationalExpr sessionId conn (RelationVariable "property" ())
243+
244+ props <- toList properties' >>= mapM (handleError . fromTuple) :: IO [Property]
245+ print props
246+
247+handleError :: Either RelationalError a -> IO a
248+handleError eErr = case eErr of
249+ Left err -> print err >> error "Died due to errors."
250+ Right v -> pure v
251+
252+handleIOError :: IO (Either RelationalError a) -> IO a
253+handleIOError m = do
254+ e <- m
255+ handleError e
256+
257+handleIOErrors :: IO [Either RelationalError a] -> IO [a]
258+handleIOErrors m = do
259+ eErrs <- m
260+ case lefts eErrs of
261+ [] -> pure (rights eErrs)
262+ errs -> handleError (Left (someErrors errs))
263+
84264
examples/out_of_the_tarpit.tutd+4−4
@@ -3,9 +3,9 @@
33data Address = Address Text
44data Agent = Agent Text
55data Name = Name Text
6−data Price = Price Double
6+data Price = Price Integer --dollars
77data RoomType = Kitchen | Bathroom | LivingRoom
8−data PriceBand = Low | Medium | High | Premium
8+data PriceBand = Low | Med | High | Premium
99data AreaCode = City | Suburban | Rural
1010data SpeedBand = VeryFast | Fast | Medium | Slow
1111
@@ -57,9 +57,9 @@ constraint noOffersAfterSale (offer join decision where ^dayEarlierThan(@offerDa
5757--1. identify offerPrices > 2000 (arbitrarily-chosen high price band which is not specified in the paper)
5858--2. remove the properties which have been sold
5959--3. group and count sub-relation and restrict by greater than 50
60−constraint noMoreThan50PremiumProperties ((((property where ^gt(offerPrice,2000.0)) minus ((property join decision){address,agent,dateRegistered,photo,price})) group ({} as x) : {z:=gt(count(@x),50)}) {z}){} equals false
60+constraint noMoreThan50PremiumProperties ((((property where ^gt(@price,Price 2000)) minus ((property join decision){address,agent,dateRegistered,photo,price})) group ({} as x) : {z:=gt(count(@x),50)}) {z}){} equals false
6161
62−constraint noBidderCanMakeMoreThan10BidsOnAProperty (((offer group ({all but bidderAddress} as bidder)) : {bidCount:=gt(count(@bidder),10)}) where ^gt(bidCount,10)) {} equals false
62+constraint noBidderCanMakeMoreThan10BidsOnAProperty (((offer group ({all but bidderAddress} as bidder)) : {bidCount:=gt(count(@bidder),10)}) where ^gt(@bidCount,10)) {} equals false
6363
6464-- sample data
6565
h2svg.shnew file+1
@@ -0,0 +1 @@
1+./.cabal-sandbox/bin/ghc-prof-flamegraph < bigrel.prof | perl ~/Dev/flamegraph.pl
hp2svg.shnew file+2
@@ -0,0 +1,2 @@
1+cabal run bigrel -- --attribute-count 10 --tuple-count 10000 -d "x:=x" +RTS -h > /dev/null
2+./.cabal-sandbox/bin/hp2pretty bigrel.hp
install_tools.shnew file+3
@@ -0,0 +1,3 @@
1+cabal install --enable-profiling --enable-tests
2+cabal install ghc-prof-flamegraph
3+cabal install hp2pretty
jupyter/TutorialD Notebook Walkthrough.ipynbnew file+794
@@ -0,0 +1,794 @@
1+{
2+ "cells": [
3+ {
4+ "cell_type": "markdown",
5+ "metadata": {},
6+ "source": [
7+ "# Introduction to TutorialD via Jupyter Notebook\n",
8+ "\n",
9+ "Thanks for trying Project:M36 via this Jupyter notebook. TutorialD is a language for interacting with relational algebra databases, similar to SQL but without the historical cruft. This notebook is based on the [TutorialD Tutorial](https://github.com/agentm/project-m36/blob/master/docs/tutd_tutorial.markdown). \n",
10+ "\n",
11+ "[Project:M36](https://github.com/agentm/project-m36) is a feature-rich database management system (DBMS) which casts off the baggage of legacy DBMSes by adhering strictly to the mathematics of the relational algebra.\n",
12+ "\n",
13+ "Please refer to the [Project:M36 documentation](https://github.com/agentm/project-m36#documentation) for more detailed examples. Let's get started!\n",
14+ "\n",
15+ "First, let's import the Chris Date example relation variables. The relation variables provided in the example are:\n",
16+ "\n",
17+ "* `s` suppliers\n",
18+ "* `sp` supplier-parts\n",
19+ "* `p` parts"
20+ ]
21+ },
22+ {
23+ "cell_type": "code",
24+ "execution_count": 1,
25+ "metadata": {},
26+ "outputs": [
27+ {
28+ "data": {
29+ "text/html": [
30+ "ok"
31+ ],
32+ "text/plain": [
33+ "ok"
34+ ]
35+ },
36+ "metadata": {},
37+ "output_type": "display_data"
38+ }
39+ ],
40+ "source": [
41+ ":importexample cjdate"
42+ ]
43+ },
44+ {
45+ "cell_type": "markdown",
46+ "metadata": {},
47+ "source": [
48+ "If you see an error in the previous cell regarding `project-m36-websocket-server` not being in your `PATH`, add the binary to your `PATH` and restart the jupyter server.\n",
49+ "\n",
50+ "Let's take a look at the relation variables."
51+ ]
52+ },
53+ {
54+ "cell_type": "code",
55+ "execution_count": 2,
56+ "metadata": {},
57+ "outputs": [
58+ {
59+ "data": {
60+ "text/html": [
61+ "<style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style><table class=\"pm36relation\"\"><tr><th>s#::Text</th><th>sname::Text</th><th>status::Integer</th><th>city::Text</th></tr><tr><td>\"S3\"</td><td>\"Blake\"</td><td>30</td><td>\"Paris\"</td></tr><tr><td>\"S5\"</td><td>\"Adams\"</td><td>30</td><td>\"Athens\"</td></tr><tr><td>\"S4\"</td><td>\"Clark\"</td><td>20</td><td>\"London\"</td></tr><tr><td>\"S1\"</td><td>\"Smith\"</td><td>20</td><td>\"London\"</td></tr><tr><td>\"S2\"</td><td>\"Jones\"</td><td>10</td><td>\"Paris\"</td></tr><tfoot><tr><td colspan=\"100%\">Finite 5 tuples</td></tr></tfoot></table>"
62+ ],
63+ "text/plain": [
64+ "┌──────────┬────────┬───────────┬───────────────┐\n",
65+ "│city::Text│s#::Text│sname::Text│status::Integer│\n",
66+ "├──────────┼────────┼───────────┼───────────────┤\n",
67+ "│\"Paris\" │\"S2\" │\"Jones\" │10 │\n",
68+ "│\"London\" │\"S1\" │\"Smith\" │20 │\n",
69+ "│\"London\" │\"S4\" │\"Clark\" │20 │\n",
70+ "│\"Athens\" │\"S5\" │\"Adams\" │30 │\n",
71+ "│\"Paris\" │\"S3\" │\"Blake\" │30 │\n",
72+ "└──────────┴────────┴───────────┴───────────────┘"
73+ ]
74+ },
75+ "metadata": {},
76+ "output_type": "display_data"
77+ }
78+ ],
79+ "source": [
80+ ":showexpr s"
81+ ]
82+ },
83+ {
84+ "cell_type": "code",
85+ "execution_count": 3,
86+ "metadata": {},
87+ "outputs": [
88+ {
89+ "data": {
90+ "text/html": [
91+ "<style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style><table class=\"pm36relation\"\"><tr><th>s#::Text</th><th>p#::Text</th><th>qty::Integer</th></tr><tr><td>\"S1\"</td><td>\"P2\"</td><td>200</td></tr><tr><td>\"S1\"</td><td>\"P1\"</td><td>300</td></tr><tr><td>\"S3\"</td><td>\"P2\"</td><td>200</td></tr><tr><td>\"S2\"</td><td>\"P2\"</td><td>400</td></tr><tr><td>\"S4\"</td><td>\"P5\"</td><td>400</td></tr><tr><td>\"S1\"</td><td>\"P5\"</td><td>100</td></tr><tr><td>\"S1\"</td><td>\"P6\"</td><td>100</td></tr><tr><td>\"S2\"</td><td>\"P1\"</td><td>300</td></tr><tr><td>\"S1\"</td><td>\"P4\"</td><td>200</td></tr><tr><td>\"S4\"</td><td>\"P4\"</td><td>300</td></tr><tr><td>\"S4\"</td><td>\"P2\"</td><td>200</td></tr><tr><td>\"S1\"</td><td>\"P3\"</td><td>400</td></tr><tfoot><tr><td colspan=\"100%\">Finite 12 tuples</td></tr></tfoot></table>"
92+ ],
93+ "text/plain": [
94+ "┌────────┬────────────┬────────┐\n",
95+ "│p#::Text│qty::Integer│s#::Text│\n",
96+ "├────────┼────────────┼────────┤\n",
97+ "│\"P3\" │400 │\"S1\" │\n",
98+ "│\"P2\" │200 │\"S4\" │\n",
99+ "│\"P4\" │300 │\"S4\" │\n",
100+ "│\"P4\" │200 │\"S1\" │\n",
101+ "│\"P1\" │300 │\"S2\" │\n",
102+ "│\"P6\" │100 │\"S1\" │\n",
103+ "│\"P5\" │100 │\"S1\" │\n",
104+ "│\"P5\" │400 │\"S4\" │\n",
105+ "│\"P2\" │400 │\"S2\" │\n",
106+ "│\"P2\" │200 │\"S3\" │\n",
107+ "│\"P1\" │300 │\"S1\" │\n",
108+ "│\"P2\" │200 │\"S1\" │\n",
109+ "└────────┴────────────┴────────┘"
110+ ]
111+ },
112+ "metadata": {},
113+ "output_type": "display_data"
114+ }
115+ ],
116+ "source": [
117+ ":showexpr sp"
118+ ]
119+ },
120+ {
121+ "cell_type": "code",
122+ "execution_count": 4,
123+ "metadata": {
124+ "scrolled": true
125+ },
126+ "outputs": [
127+ {
128+ "data": {
129+ "text/html": [
130+ "<style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style><table class=\"pm36relation\"\"><tr><th>p#::Text</th><th>pname::Text</th><th>color::Text</th><th>weight::Integer</th><th>city::Text</th></tr><tr><td>\"P3\"</td><td>\"Screw\"</td><td>\"Blue\"</td><td>17</td><td>\"Oslo\"</td></tr><tr><td>\"P2\"</td><td>\"Bolt\"</td><td>\"Green\"</td><td>17</td><td>\"Paris\"</td></tr><tr><td>\"P4\"</td><td>\"Screw\"</td><td>\"Red\"</td><td>14</td><td>\"London\"</td></tr><tr><td>\"P6\"</td><td>\"Cog\"</td><td>\"Red\"</td><td>19</td><td>\"London\"</td></tr><tr><td>\"P1\"</td><td>\"Nut\"</td><td>\"Red\"</td><td>12</td><td>\"London\"</td></tr><tr><td>\"P5\"</td><td>\"Cam\"</td><td>\"Blue\"</td><td>12</td><td>\"Paris\"</td></tr><tfoot><tr><td colspan=\"100%\">Finite 6 tuples</td></tr></tfoot></table>"
131+ ],
132+ "text/plain": [
133+ "┌──────────┬───────────┬────────┬───────────┬───────────────┐\n",
134+ "│city::Text│color::Text│p#::Text│pname::Text│weight::Integer│\n",
135+ "├──────────┼───────────┼────────┼───────────┼───────────────┤\n",
136+ "│\"Paris\" │\"Blue\" │\"P5\" │\"Cam\" │12 │\n",
137+ "│\"London\" │\"Red\" │\"P1\" │\"Nut\" │12 │\n",
138+ "│\"London\" │\"Red\" │\"P6\" │\"Cog\" │19 │\n",
139+ "│\"London\" │\"Red\" │\"P4\" │\"Screw\" │14 │\n",
140+ "│\"Paris\" │\"Green\" │\"P2\" │\"Bolt\" │17 │\n",
141+ "│\"Oslo\" │\"Blue\" │\"P3\" │\"Screw\" │17 │\n",
142+ "└──────────┴───────────┴────────┴───────────┴───────────────┘"
143+ ]
144+ },
145+ "metadata": {},
146+ "output_type": "display_data"
147+ }
148+ ],
149+ "source": [
150+ "\n",
151+ ":showexpr p"
152+ ]
153+ },
154+ {
155+ "cell_type": "markdown",
156+ "metadata": {},
157+ "source": [
158+ "## Relational Operators\n",
159+ "\n",
160+ "### Restriction\n",
161+ "\n",
162+ "We can see that there is a many-to-many relationship between `s` (suppliers) and `p` (parts) via the `sp` relation variable.\n",
163+ "\n",
164+ "Let's look at the suppliers who are in London. This is called \"restriction\".\n",
165+ "\n",
166+ "Note that the relation attributes have appropriate types which restrict the values which they can contain."
167+ ]
168+ },
169+ {
170+ "cell_type": "code",
171+ "execution_count": 5,
172+ "metadata": {},
173+ "outputs": [
174+ {
175+ "data": {
176+ "text/html": [
177+ "<style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style><table class=\"pm36relation\"\"><tr><th>s#::Text</th><th>sname::Text</th><th>status::Integer</th><th>city::Text</th></tr><tr><td>\"S4\"</td><td>\"Clark\"</td><td>20</td><td>\"London\"</td></tr><tr><td>\"S1\"</td><td>\"Smith\"</td><td>20</td><td>\"London\"</td></tr><tfoot><tr><td colspan=\"100%\">Finite 2 tuples</td></tr></tfoot></table>"
178+ ],
179+ "text/plain": [
180+ "┌──────────┬────────┬───────────┬───────────────┐\n",
181+ "│city::Text│s#::Text│sname::Text│status::Integer│\n",
182+ "├──────────┼────────┼───────────┼───────────────┤\n",
183+ "│\"London\" │\"S1\" │\"Smith\" │20 │\n",
184+ "│\"London\" │\"S4\" │\"Clark\" │20 │\n",
185+ "└──────────┴────────┴───────────┴───────────────┘"
186+ ]
187+ },
188+ "metadata": {},
189+ "output_type": "display_data"
190+ }
191+ ],
192+ "source": [
193+ ":showexpr s where city=\"London\""
194+ ]
195+ },
196+ {
197+ "cell_type": "markdown",
198+ "metadata": {},
199+ "source": [
200+ "### Join And Projection\n",
201+ "\n",
202+ "Let's examine which parts the London suppliers offer. In the following expression, we make use of the relational join operator (equivalent to `NATURAL JOIN` in SQL) and projection using the trailing curly brackets to only return the relation attributes which interest us."
203+ ]
204+ },
205+ {
206+ "cell_type": "code",
207+ "execution_count": 6,
208+ "metadata": {},
209+ "outputs": [
210+ {
211+ "data": {
212+ "text/html": [
213+ "<style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style><table class=\"pm36relation\"\"><tr><th>qty::Integer</th><th>pname::Text</th><th>p#::Text</th></tr><tr><td>100</td><td>\"Cog\"</td><td>\"P6\"</td></tr><tr><td>300</td><td>\"Nut\"</td><td>\"P1\"</td></tr><tr><td>300</td><td>\"Screw\"</td><td>\"P4\"</td></tr><tr><td>200</td><td>\"Screw\"</td><td>\"P4\"</td></tr><tfoot><tr><td colspan=\"100%\">Finite 4 tuples</td></tr></tfoot></table>"
214+ ],
215+ "text/plain": [
216+ "┌────────┬───────────┬────────────┐\n",
217+ "│p#::Text│pname::Text│qty::Integer│\n",
218+ "├────────┼───────────┼────────────┤\n",
219+ "│\"P4\" │\"Screw\" │200 │\n",
220+ "│\"P4\" │\"Screw\" │300 │\n",
221+ "│\"P1\" │\"Nut\" │300 │\n",
222+ "│\"P6\" │\"Cog\" │100 │\n",
223+ "└────────┴───────────┴────────────┘"
224+ ]
225+ },
226+ "metadata": {},
227+ "output_type": "display_data"
228+ }
229+ ],
230+ "source": [
231+ ":showexpr ((s where city=\"London\") join sp join p){p#,pname,qty}"
232+ ]
233+ },
234+ {
235+ "cell_type": "markdown",
236+ "metadata": {},
237+ "source": [
238+ "### Extend and Atom Functions\n",
239+ "\n",
240+ "We can also execute server-side functions on values and add them to our result relation."
241+ ]
242+ },
243+ {
244+ "cell_type": "code",
245+ "execution_count": 7,
246+ "metadata": {},
247+ "outputs": [
248+ {
249+ "data": {
250+ "text/html": [
251+ "<style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style><table class=\"pm36relation\"\"><tr><th>s#::Text</th><th>status::Integer</th><th>statusplus10::Integer</th></tr><tr><td>\"S1\"</td><td>20</td><td>30</td></tr><tr><td>\"S4\"</td><td>20</td><td>30</td></tr><tr><td>\"S5\"</td><td>30</td><td>40</td></tr><tr><td>\"S3\"</td><td>30</td><td>40</td></tr><tr><td>\"S2\"</td><td>10</td><td>20</td></tr><tfoot><tr><td colspan=\"100%\">Finite 5 tuples</td></tr></tfoot></table>"
252+ ],
253+ "text/plain": [
254+ "┌────────┬───────────────┬─────────────────────┐\n",
255+ "│s#::Text│status::Integer│statusplus10::Integer│\n",
256+ "├────────┼───────────────┼─────────────────────┤\n",
257+ "│\"S2\" │10 │20 │\n",
258+ "│\"S3\" │30 │40 │\n",
259+ "│\"S5\" │30 │40 │\n",
260+ "│\"S4\" │20 │30 │\n",
261+ "│\"S1\" │20 │30 │\n",
262+ "└────────┴───────────────┴─────────────────────┘"
263+ ]
264+ },
265+ "metadata": {},
266+ "output_type": "display_data"
267+ }
268+ ],
269+ "source": [
270+ ":showexpr (s:{statusplus10:=add(@status,10)}){s#,status,statusplus10}"
271+ ]
272+ },
273+ {
274+ "cell_type": "markdown",
275+ "metadata": {},
276+ "source": [
277+ "### Group and Ungroup\n",
278+ "\n",
279+ "Unlike most databases, Project:M36 supports relation-valued attributes. This means that database values (atoms) can also be relations. Relation-valued attributes can be represented in the notebook as nested tables of values. Note that the nested relation's type is `relation {qty::Integer,pname::Text,s#::Text}`. \n",
280+ "\n",
281+ "Relation-valued attributes reduce tuple duplication by clearly associating certain values with their related multiple tuples. The `group` operator can also be used to create the SQL equivalent of `OUTER JOIN` but without the need for representing `NULL` in any form.\n",
282+ "\n",
283+ "Let's list the available counts for each supplier for each part."
284+ ]
285+ },
286+ {
287+ "cell_type": "code",
288+ "execution_count": 8,
289+ "metadata": {},
290+ "outputs": [
291+ {
292+ "data": {
293+ "text/html": [
294+ "<style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style><table class=\"pm36relation\"\"><tr><th>p#::Text</th><th>availability::relation {qty::Integer,pname::Text,s#::Text}</th></tr><tr><td>\"P6\"</td><td><style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style><table class=\"pm36relation\"\"><tr><th>qty::Integer</th><th>pname::Text</th><th>s#::Text</th></tr><tr><td>100</td><td>\"Cog\"</td><td>\"S1\"</td></tr><tfoot><tr><td colspan=\"100%\">Finite 1 tuples</td></tr></tfoot></table></td></tr><tr><td>\"P1\"</td><td><style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style><table class=\"pm36relation\"\"><tr><th>qty::Integer</th><th>pname::Text</th><th>s#::Text</th></tr><tr><td>300</td><td>\"Nut\"</td><td>\"S2\"</td></tr><tr><td>300</td><td>\"Nut\"</td><td>\"S1\"</td></tr><tfoot><tr><td colspan=\"100%\">Finite 2 tuples</td></tr></tfoot></table></td></tr><tr><td>\"P2\"</td><td><style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style><table class=\"pm36relation\"\"><tr><th>qty::Integer</th><th>pname::Text</th><th>s#::Text</th></tr><tr><td>200</td><td>\"Bolt\"</td><td>\"S4\"</td></tr><tr><td>200</td><td>\"Bolt\"</td><td>\"S1\"</td></tr><tr><td>400</td><td>\"Bolt\"</td><td>\"S2\"</td></tr><tr><td>200</td><td>\"Bolt\"</td><td>\"S3\"</td></tr><tfoot><tr><td colspan=\"100%\">Finite 4 tuples</td></tr></tfoot></table></td></tr><tr><td>\"P4\"</td><td><style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style><table class=\"pm36relation\"\"><tr><th>qty::Integer</th><th>pname::Text</th><th>s#::Text</th></tr><tr><td>200</td><td>\"Screw\"</td><td>\"S1\"</td></tr><tr><td>300</td><td>\"Screw\"</td><td>\"S4\"</td></tr><tfoot><tr><td colspan=\"100%\">Finite 2 tuples</td></tr></tfoot></table></td></tr><tr><td>\"P3\"</td><td><style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style><table class=\"pm36relation\"\"><tr><th>qty::Integer</th><th>pname::Text</th><th>s#::Text</th></tr><tr><td>400</td><td>\"Screw\"</td><td>\"S1\"</td></tr><tfoot><tr><td colspan=\"100%\">Finite 1 tuples</td></tr></tfoot></table></td></tr><tr><td>\"P5\"</td><td><style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style><table class=\"pm36relation\"\"><tr><th>qty::Integer</th><th>pname::Text</th><th>s#::Text</th></tr><tr><td>400</td><td>\"Cam\"</td><td>\"S4\"</td></tr><tr><td>100</td><td>\"Cam\"</td><td>\"S1\"</td></tr><tfoot><tr><td colspan=\"100%\">Finite 2 tuples</td></tr></tfoot></table></td></tr><tfoot><tr><td colspan=\"100%\">Finite 6 tuples</td></tr></tfoot></table>"
295+ ],
296+ "text/plain": [
297+ "┌──────────────────────────────────────────────────────────┬────────┐\n",
298+ "│availability::relation {qty::Integer,pname::Text,s#::Text}│p#::Text│\n",
299+ "├──────────────────────────────────────────────────────────┼────────┤\n",
300+ "│┌───────────┬────────────┬────────┐ │\"P5\" │\n",
301+ "││pname::Text│qty::Integer│s#::Text│ │ │\n",
302+ "│├───────────┼────────────┼────────┤ │ │\n",
303+ "││\"Cam\" │100 │\"S1\" │ │ │\n",
304+ "││\"Cam\" │400 │\"S4\" │ │ │\n",
305+ "│└───────────┴────────────┴────────┘ │ │\n",
306+ "│┌───────────┬────────────┬────────┐ │\"P3\" │\n",
307+ "││pname::Text│qty::Integer│s#::Text│ │ │\n",
308+ "│├───────────┼────────────┼────────┤ │ │\n",
309+ "││\"Screw\" │400 │\"S1\" │ │ │\n",
310+ "│└───────────┴────────────┴────────┘ │ │\n",
311+ "│┌───────────┬────────────┬────────┐ │\"P4\" │\n",
312+ "││pname::Text│qty::Integer│s#::Text│ │ │\n",
313+ "│├───────────┼────────────┼────────┤ │ │\n",
314+ "││\"Screw\" │300 │\"S4\" │ │ │\n",
315+ "││\"Screw\" │200 │\"S1\" │ │ │\n",
316+ "│└───────────┴────────────┴────────┘ │ │\n",
317+ "│┌───────────┬────────────┬────────┐ │\"P2\" │\n",
318+ "││pname::Text│qty::Integer│s#::Text│ │ │\n",
319+ "│├───────────┼────────────┼────────┤ │ │\n",
320+ "││\"Bolt\" │200 │\"S3\" │ │ │\n",
321+ "││\"Bolt\" │400 │\"S2\" │ │ │\n",
322+ "││\"Bolt\" │200 │\"S1\" │ │ │\n",
323+ "││\"Bolt\" │200 │\"S4\" │ │ │\n",
324+ "│└───────────┴────────────┴────────┘ │ │\n",
325+ "│┌───────────┬────────────┬────────┐ │\"P1\" │\n",
326+ "││pname::Text│qty::Integer│s#::Text│ │ │\n",
327+ "│├───────────┼────────────┼────────┤ │ │\n",
328+ "││\"Nut\" │300 │\"S1\" │ │ │\n",
329+ "││\"Nut\" │300 │\"S2\" │ │ │\n",
330+ "│└───────────┴────────────┴────────┘ │ │\n",
331+ "│┌───────────┬────────────┬────────┐ │\"P6\" │\n",
332+ "││pname::Text│qty::Integer│s#::Text│ │ │\n",
333+ "│├───────────┼────────────┼────────┤ │ │\n",
334+ "││\"Cog\" │100 │\"S1\" │ │ │\n",
335+ "│└───────────┴────────────┴────────┘ │ │\n",
336+ "└──────────────────────────────────────────────────────────┴────────┘"
337+ ]
338+ },
339+ "metadata": {},
340+ "output_type": "display_data"
341+ }
342+ ],
343+ "source": [
344+ ":showexpr (p join sp){qty,pname,s#,p#} group ({s#,pname,qty} as availability)"
345+ ]
346+ },
347+ {
348+ "cell_type": "markdown",
349+ "metadata": {},
350+ "source": [
351+ "We can flatten the relation-valued attributes, thereby generating more top-level tuples."
352+ ]
353+ },
354+ {
355+ "cell_type": "code",
356+ "execution_count": 9,
357+ "metadata": {},
358+ "outputs": [
359+ {
360+ "data": {
361+ "text/html": [
362+ "<style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style><table class=\"pm36relation\"\"><tr><th>qty::Integer</th><th>pname::Text</th><th>s#::Text</th><th>p#::Text</th></tr><tr><td>400</td><td>\"Screw\"</td><td>\"S1\"</td><td>\"P3\"</td></tr><tr><td>200</td><td>\"Bolt\"</td><td>\"S4\"</td><td>\"P2\"</td></tr><tr><td>100</td><td>\"Cog\"</td><td>\"S1\"</td><td>\"P6\"</td></tr><tr><td>100</td><td>\"Cam\"</td><td>\"S1\"</td><td>\"P5\"</td></tr><tr><td>300</td><td>\"Nut\"</td><td>\"S2\"</td><td>\"P1\"</td></tr><tr><td>400</td><td>\"Cam\"</td><td>\"S4\"</td><td>\"P5\"</td></tr><tr><td>300</td><td>\"Screw\"</td><td>\"S4\"</td><td>\"P4\"</td></tr><tr><td>200</td><td>\"Bolt\"</td><td>\"S1\"</td><td>\"P2\"</td></tr><tr><td>200</td><td>\"Screw\"</td><td>\"S1\"</td><td>\"P4\"</td></tr><tr><td>200</td><td>\"Bolt\"</td><td>\"S3\"</td><td>\"P2\"</td></tr><tr><td>300</td><td>\"Nut\"</td><td>\"S1\"</td><td>\"P1\"</td></tr><tr><td>400</td><td>\"Bolt\"</td><td>\"S2\"</td><td>\"P2\"</td></tr><tfoot><tr><td colspan=\"100%\">Finite 12 tuples</td></tr></tfoot></table>"
363+ ],
364+ "text/plain": [
365+ "┌────────┬───────────┬────────────┬────────┐\n",
366+ "│p#::Text│pname::Text│qty::Integer│s#::Text│\n",
367+ "├────────┼───────────┼────────────┼────────┤\n",
368+ "│\"P2\" │\"Bolt\" │400 │\"S2\" │\n",
369+ "│\"P1\" │\"Nut\" │300 │\"S1\" │\n",
370+ "│\"P2\" │\"Bolt\" │200 │\"S3\" │\n",
371+ "│\"P4\" │\"Screw\" │200 │\"S1\" │\n",
372+ "│\"P2\" │\"Bolt\" │200 │\"S1\" │\n",
373+ "│\"P4\" │\"Screw\" │300 │\"S4\" │\n",
374+ "│\"P5\" │\"Cam\" │400 │\"S4\" │\n",
375+ "│\"P1\" │\"Nut\" │300 │\"S2\" │\n",
376+ "│\"P5\" │\"Cam\" │100 │\"S1\" │\n",
377+ "│\"P6\" │\"Cog\" │100 │\"S1\" │\n",
378+ "│\"P2\" │\"Bolt\" │200 │\"S4\" │\n",
379+ "│\"P3\" │\"Screw\" │400 │\"S1\" │\n",
380+ "└────────┴───────────┴────────────┴────────┘"
381+ ]
382+ },
383+ "metadata": {},
384+ "output_type": "display_data"
385+ }
386+ ],
387+ "source": [
388+ ":showexpr ((p join sp){qty,pname,s#,p#} group ({s#,pname,qty} as availability)) ungroup availability"
389+ ]
390+ },
391+ {
392+ "cell_type": "markdown",
393+ "metadata": {},
394+ "source": [
395+ "## Database State Operators\n",
396+ "\n",
397+ "Thus far, we have only been inspecting the database state. Next, let's cover some database update operators. These operators are all similar to SQL operators, so we don't need a lot of exposition."
398+ ]
399+ },
400+ {
401+ "cell_type": "markdown",
402+ "metadata": {},
403+ "source": [
404+ "### Insert"
405+ ]
406+ },
407+ {
408+ "cell_type": "code",
409+ "execution_count": 10,
410+ "metadata": {},
411+ "outputs": [
412+ {
413+ "data": {
414+ "text/html": [
415+ "ok"
416+ ],
417+ "text/plain": [
418+ "ok"
419+ ]
420+ },
421+ "metadata": {},
422+ "output_type": "display_data"
423+ }
424+ ],
425+ "source": [
426+ "insert s relation{tuple{s# \"S6\", sname \"Bob\", status 50, city \"Boston\"}}"
427+ ]
428+ },
429+ {
430+ "cell_type": "code",
431+ "execution_count": 11,
432+ "metadata": {},
433+ "outputs": [
434+ {
435+ "data": {
436+ "text/html": [
437+ "<style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style><table class=\"pm36relation\"\"><tr><th>city::Text</th><th>s#::Text</th><th>sname::Text</th><th>status::Integer</th></tr><tr><td>\"Boston\"</td><td>\"S6\"</td><td>\"Bob\"</td><td>50</td></tr><tr><td>\"Paris\"</td><td>\"S3\"</td><td>\"Blake\"</td><td>30</td></tr><tr><td>\"Athens\"</td><td>\"S5\"</td><td>\"Adams\"</td><td>30</td></tr><tr><td>\"London\"</td><td>\"S4\"</td><td>\"Clark\"</td><td>20</td></tr><tr><td>\"London\"</td><td>\"S1\"</td><td>\"Smith\"</td><td>20</td></tr><tr><td>\"Paris\"</td><td>\"S2\"</td><td>\"Jones\"</td><td>10</td></tr><tfoot><tr><td colspan=\"100%\">Finite 6 tuples</td></tr></tfoot></table>"
438+ ],
439+ "text/plain": [
440+ "┌──────────┬────────┬───────────┬───────────────┐\n",
441+ "│city::Text│s#::Text│sname::Text│status::Integer│\n",
442+ "├──────────┼────────┼───────────┼───────────────┤\n",
443+ "│\"Paris\" │\"S2\" │\"Jones\" │10 │\n",
444+ "│\"London\" │\"S1\" │\"Smith\" │20 │\n",
445+ "│\"London\" │\"S4\" │\"Clark\" │20 │\n",
446+ "│\"Athens\" │\"S5\" │\"Adams\" │30 │\n",
447+ "│\"Paris\" │\"S3\" │\"Blake\" │30 │\n",
448+ "│\"Boston\" │\"S6\" │\"Bob\" │50 │\n",
449+ "└──────────┴────────┴───────────┴───────────────┘"
450+ ]
451+ },
452+ "metadata": {},
453+ "output_type": "display_data"
454+ }
455+ ],
456+ "source": [
457+ ":showexpr s"
458+ ]
459+ },
460+ {
461+ "cell_type": "markdown",
462+ "metadata": {},
463+ "source": [
464+ "### Delete"
465+ ]
466+ },
467+ {
468+ "cell_type": "code",
469+ "execution_count": 12,
470+ "metadata": {},
471+ "outputs": [
472+ {
473+ "data": {
474+ "text/html": [
475+ "ok"
476+ ],
477+ "text/plain": [
478+ "ok"
479+ ]
480+ },
481+ "metadata": {},
482+ "output_type": "display_data"
483+ }
484+ ],
485+ "source": [
486+ "delete s where sname=\"Bob\""
487+ ]
488+ },
489+ {
490+ "cell_type": "code",
491+ "execution_count": 13,
492+ "metadata": {},
493+ "outputs": [
494+ {
495+ "data": {
496+ "text/html": [
497+ "<style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style><table class=\"pm36relation\"\"><tr><th>city::Text</th><th>s#::Text</th><th>sname::Text</th><th>status::Integer</th></tr><tr><td>\"Paris\"</td><td>\"S3\"</td><td>\"Blake\"</td><td>30</td></tr><tr><td>\"Athens\"</td><td>\"S5\"</td><td>\"Adams\"</td><td>30</td></tr><tr><td>\"London\"</td><td>\"S4\"</td><td>\"Clark\"</td><td>20</td></tr><tr><td>\"London\"</td><td>\"S1\"</td><td>\"Smith\"</td><td>20</td></tr><tr><td>\"Paris\"</td><td>\"S2\"</td><td>\"Jones\"</td><td>10</td></tr><tfoot><tr><td colspan=\"100%\">Finite 5 tuples</td></tr></tfoot></table>"
498+ ],
499+ "text/plain": [
500+ "┌──────────┬────────┬───────────┬───────────────┐\n",
501+ "│city::Text│s#::Text│sname::Text│status::Integer│\n",
502+ "├──────────┼────────┼───────────┼───────────────┤\n",
503+ "│\"Paris\" │\"S2\" │\"Jones\" │10 │\n",
504+ "│\"London\" │\"S1\" │\"Smith\" │20 │\n",
505+ "│\"London\" │\"S4\" │\"Clark\" │20 │\n",
506+ "│\"Athens\" │\"S5\" │\"Adams\" │30 │\n",
507+ "│\"Paris\" │\"S3\" │\"Blake\" │30 │\n",
508+ "└──────────┴────────┴───────────┴───────────────┘"
509+ ]
510+ },
511+ "metadata": {},
512+ "output_type": "display_data"
513+ }
514+ ],
515+ "source": [
516+ ":showexpr s"
517+ ]
518+ },
519+ {
520+ "cell_type": "markdown",
521+ "metadata": {},
522+ "source": [
523+ "### Update"
524+ ]
525+ },
526+ {
527+ "cell_type": "code",
528+ "execution_count": 14,
529+ "metadata": {},
530+ "outputs": [
531+ {
532+ "data": {
533+ "text/html": [
534+ "ok"
535+ ],
536+ "text/plain": [
537+ "ok"
538+ ]
539+ },
540+ "metadata": {},
541+ "output_type": "display_data"
542+ }
543+ ],
544+ "source": [
545+ "update s where city=\"London\" (status:=90)"
546+ ]
547+ },
548+ {
549+ "cell_type": "code",
550+ "execution_count": 15,
551+ "metadata": {},
552+ "outputs": [
553+ {
554+ "data": {
555+ "text/html": [
556+ "<style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style><table class=\"pm36relation\"\"><tr><th>city::Text</th><th>s#::Text</th><th>sname::Text</th><th>status::Integer</th></tr><tr><td>\"London\"</td><td>\"S1\"</td><td>\"Smith\"</td><td>90</td></tr><tr><td>\"Paris\"</td><td>\"S3\"</td><td>\"Blake\"</td><td>30</td></tr><tr><td>\"Athens\"</td><td>\"S5\"</td><td>\"Adams\"</td><td>30</td></tr><tr><td>\"London\"</td><td>\"S4\"</td><td>\"Clark\"</td><td>90</td></tr><tr><td>\"Paris\"</td><td>\"S2\"</td><td>\"Jones\"</td><td>10</td></tr><tfoot><tr><td colspan=\"100%\">Finite 5 tuples</td></tr></tfoot></table>"
557+ ],
558+ "text/plain": [
559+ "┌──────────┬────────┬───────────┬───────────────┐\n",
560+ "│city::Text│s#::Text│sname::Text│status::Integer│\n",
561+ "├──────────┼────────┼───────────┼───────────────┤\n",
562+ "│\"Paris\" │\"S2\" │\"Jones\" │10 │\n",
563+ "│\"London\" │\"S4\" │\"Clark\" │90 │\n",
564+ "│\"Athens\" │\"S5\" │\"Adams\" │30 │\n",
565+ "│\"Paris\" │\"S3\" │\"Blake\" │30 │\n",
566+ "│\"London\" │\"S1\" │\"Smith\" │90 │\n",
567+ "└──────────┴────────┴───────────┴───────────────┘"
568+ ]
569+ },
570+ "metadata": {},
571+ "output_type": "display_data"
572+ }
573+ ],
574+ "source": [
575+ ":showexpr s"
576+ ]
577+ },
578+ {
579+ "cell_type": "markdown",
580+ "metadata": {},
581+ "source": [
582+ "### Assign"
583+ ]
584+ },
585+ {
586+ "cell_type": "code",
587+ "execution_count": 16,
588+ "metadata": {},
589+ "outputs": [
590+ {
591+ "data": {
592+ "text/html": [
593+ "ok"
594+ ],
595+ "text/plain": [
596+ "ok"
597+ ]
598+ },
599+ "metadata": {},
600+ "output_type": "display_data"
601+ }
602+ ],
603+ "source": [
604+ "london_suppliers := s where city=\"London\""
605+ ]
606+ },
607+ {
608+ "cell_type": "code",
609+ "execution_count": 17,
610+ "metadata": {},
611+ "outputs": [
612+ {
613+ "data": {
614+ "text/html": [
615+ "<style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style><table class=\"pm36relation\"\"><tr><th>city::Text</th><th>s#::Text</th><th>sname::Text</th><th>status::Integer</th></tr><tr><td>\"London\"</td><td>\"S1\"</td><td>\"Smith\"</td><td>90</td></tr><tr><td>\"London\"</td><td>\"S4\"</td><td>\"Clark\"</td><td>90</td></tr><tfoot><tr><td colspan=\"100%\">Finite 2 tuples</td></tr></tfoot></table>"
616+ ],
617+ "text/plain": [
618+ "┌──────────┬────────┬───────────┬───────────────┐\n",
619+ "│city::Text│s#::Text│sname::Text│status::Integer│\n",
620+ "├──────────┼────────┼───────────┼───────────────┤\n",
621+ "│\"London\" │\"S4\" │\"Clark\" │90 │\n",
622+ "│\"London\" │\"S1\" │\"Smith\" │90 │\n",
623+ "└──────────┴────────┴───────────┴───────────────┘"
624+ ]
625+ },
626+ "metadata": {},
627+ "output_type": "display_data"
628+ }
629+ ],
630+ "source": [
631+ ":showexpr london_suppliers"
632+ ]
633+ },
634+ {
635+ "cell_type": "markdown",
636+ "metadata": {},
637+ "source": [
638+ "## Constraints\n",
639+ "\n",
640+ "Project:M36 supports too many features to cover in one notebook, but constraints are certainly essential.\n",
641+ "\n",
642+ "Let's examine the current constraints."
643+ ]
644+ },
645+ {
646+ "cell_type": "code",
647+ "execution_count": 18,
648+ "metadata": {},
649+ "outputs": [
650+ {
651+ "data": {
652+ "text/html": [
653+ "<style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style><table class=\"pm36relation\"\"><tr><th>name::Text</th><th>sub::Text</th><th>super::Text</th></tr><tr><td>\"p_pkey\"</td><td>\"NotEquals (Project (AttributeNames (fromList [\\\"b\\\"])) (Extend (AttributeExtendTupleExpr \\\"b\\\" (FunctionAtomExpr \\\"count\\\" [AttributeAtomExpr \\\"a\\\"] ())) (Extend (AttributeExtendTupleExpr \\\"a\\\" (RelationAtomExpr (RelationVariable \\\"p\\\" ()))) (ExistingRelation (Relation [] (RelationTupleSet {asList = [RelationTuple [] []]})))))) (Project (AttributeNames (fromList [\\\"b\\\"])) (Extend (AttributeExtendTupleExpr \\\"b\\\" (FunctionAtomExpr \\\"count\\\" [AttributeAtomExpr \\\"a\\\"] ())) (Extend (AttributeExtendTupleExpr \\\"a\\\" (RelationAtomExpr (Project (AttributeNames (fromList [\\\"p#\\\"])) (RelationVariable \\\"p\\\" ())))) (ExistingRelation (Relation [] (RelationTupleSet {asList = [RelationTuple [] []]}))))))\"</td><td>\"ExistingRelation (Relation [] (RelationTupleSet {asList = []}))\"</td></tr><tr><td>\"s_pkey\"</td><td>\"NotEquals (Project (AttributeNames (fromList [\\\"b\\\"])) (Extend (AttributeExtendTupleExpr \\\"b\\\" (FunctionAtomExpr \\\"count\\\" [AttributeAtomExpr \\\"a\\\"] ())) (Extend (AttributeExtendTupleExpr \\\"a\\\" (RelationAtomExpr (RelationVariable \\\"s\\\" ()))) (ExistingRelation (Relation [] (RelationTupleSet {asList = [RelationTuple [] []]})))))) (Project (AttributeNames (fromList [\\\"b\\\"])) (Extend (AttributeExtendTupleExpr \\\"b\\\" (FunctionAtomExpr \\\"count\\\" [AttributeAtomExpr \\\"a\\\"] ())) (Extend (AttributeExtendTupleExpr \\\"a\\\" (RelationAtomExpr (Project (AttributeNames (fromList [\\\"s#\\\"])) (RelationVariable \\\"s\\\" ())))) (ExistingRelation (Relation [] (RelationTupleSet {asList = [RelationTuple [] []]}))))))\"</td><td>\"ExistingRelation (Relation [] (RelationTupleSet {asList = []}))\"</td></tr><tr><td>\"sp_pkey\"</td><td>\"NotEquals (Project (AttributeNames (fromList [\\\"b\\\"])) (Extend (AttributeExtendTupleExpr \\\"b\\\" (FunctionAtomExpr \\\"count\\\" [AttributeAtomExpr \\\"a\\\"] ())) (Extend (AttributeExtendTupleExpr \\\"a\\\" (RelationAtomExpr (RelationVariable \\\"sp\\\" ()))) (ExistingRelation (Relation [] (RelationTupleSet {asList = [RelationTuple [] []]})))))) (Project (AttributeNames (fromList [\\\"b\\\"])) (Extend (AttributeExtendTupleExpr \\\"b\\\" (FunctionAtomExpr \\\"count\\\" [AttributeAtomExpr \\\"a\\\"] ())) (Extend (AttributeExtendTupleExpr \\\"a\\\" (RelationAtomExpr (Project (AttributeNames (fromList [\\\"p#\\\",\\\"s#\\\"])) (RelationVariable \\\"sp\\\" ())))) (ExistingRelation (Relation [] (RelationTupleSet {asList = [RelationTuple [] []]}))))))\"</td><td>\"ExistingRelation (Relation [] (RelationTupleSet {asList = []}))\"</td></tr><tfoot><tr><td colspan=\"100%\">Finite 3 tuples</td></tr></tfoot></table>"
654+ ],
655+ "text/plain": [
656+ "┌──────────┬───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬─────────────────────────────────────────────────────────────────┐\n",
657+ "│name::Text│sub::Text │super::Text │\n",
658+ "├──────────┼───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼─────────────────────────────────────────────────────────────────┤\n",
659+ "│\"sp_pkey\" │\"NotEquals (Project (AttributeNames (fromList [\\\"b\\\"])) (Extend (AttributeExtendTupleExpr \\\"b\\\" (FunctionAtomExpr \\\"count\\\" [AttributeAtomExpr \\\"a\\\"] ())) (Extend (AttributeExtendTupleExpr \\\"a\\\" (RelationAtomExpr (RelationVariable \\\"sp\\\" ()))) (ExistingRelation (Relation [] (RelationTupleSet {asList = [RelationTuple [] []]})))))) (Project (AttributeNames (fromList [\\\"b\\\"])) (Extend (AttributeExtendTupleExpr \\\"b\\\" (FunctionAtomExpr \\\"count\\\" [AttributeAtomExpr \\\"a\\\"] ())) (Extend (AttributeExtendTupleExpr \\\"a\\\" (RelationAtomExpr (Project (AttributeNames (fromList [\\\"p#\\\",\\\"s#\\\"])) (RelationVariable \\\"sp\\\" ())))) (ExistingRelation (Relation [] (RelationTupleSet {asList = [RelationTuple [] []]}))))))\"│\"ExistingRelation (Relation [] (RelationTupleSet {asList = []}))\"│\n",
660+ "│\"s_pkey\" │\"NotEquals (Project (AttributeNames (fromList [\\\"b\\\"])) (Extend (AttributeExtendTupleExpr \\\"b\\\" (FunctionAtomExpr \\\"count\\\" [AttributeAtomExpr \\\"a\\\"] ())) (Extend (AttributeExtendTupleExpr \\\"a\\\" (RelationAtomExpr (RelationVariable \\\"s\\\" ()))) (ExistingRelation (Relation [] (RelationTupleSet {asList = [RelationTuple [] []]})))))) (Project (AttributeNames (fromList [\\\"b\\\"])) (Extend (AttributeExtendTupleExpr \\\"b\\\" (FunctionAtomExpr \\\"count\\\" [AttributeAtomExpr \\\"a\\\"] ())) (Extend (AttributeExtendTupleExpr \\\"a\\\" (RelationAtomExpr (Project (AttributeNames (fromList [\\\"s#\\\"])) (RelationVariable \\\"s\\\" ())))) (ExistingRelation (Relation [] (RelationTupleSet {asList = [RelationTuple [] []]}))))))\" │\"ExistingRelation (Relation [] (RelationTupleSet {asList = []}))\"│\n",
661+ "│\"p_pkey\" │\"NotEquals (Project (AttributeNames (fromList [\\\"b\\\"])) (Extend (AttributeExtendTupleExpr \\\"b\\\" (FunctionAtomExpr \\\"count\\\" [AttributeAtomExpr \\\"a\\\"] ())) (Extend (AttributeExtendTupleExpr \\\"a\\\" (RelationAtomExpr (RelationVariable \\\"p\\\" ()))) (ExistingRelation (Relation [] (RelationTupleSet {asList = [RelationTuple [] []]})))))) (Project (AttributeNames (fromList [\\\"b\\\"])) (Extend (AttributeExtendTupleExpr \\\"b\\\" (FunctionAtomExpr \\\"count\\\" [AttributeAtomExpr \\\"a\\\"] ())) (Extend (AttributeExtendTupleExpr \\\"a\\\" (RelationAtomExpr (Project (AttributeNames (fromList [\\\"p#\\\"])) (RelationVariable \\\"p\\\" ())))) (ExistingRelation (Relation [] (RelationTupleSet {asList = [RelationTuple [] []]}))))))\" │\"ExistingRelation (Relation [] (RelationTupleSet {asList = []}))\"│\n",
662+ "└──────────┴───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴─────────────────────────────────────────────────────────────────┘"
663+ ]
664+ },
665+ "metadata": {},
666+ "output_type": "display_data"
667+ }
668+ ],
669+ "source": [
670+ ":constraints"
671+ ]
672+ },
673+ {
674+ "cell_type": "markdown",
675+ "metadata": {},
676+ "source": [
677+ "Constraints are represented as \"inclusion dependencies\". An inclusion dependency is a generalization of all possible constraints on the database and can represent keys, uniqueness constraints, foreign key constraints, as well as span multiple relation variables.\n",
678+ "\n",
679+ "An inclusion dependency requires that the result of relational expression `sub` is a subset of relational expression `super`.\n",
680+ "\n",
681+ "Project:M36 includes some utilities to generate inclusion dependencies."
682+ ]
683+ },
684+ {
685+ "cell_type": "code",
686+ "execution_count": 19,
687+ "metadata": {},
688+ "outputs": [
689+ {
690+ "data": {
691+ "text/html": [
692+ "ok"
693+ ],
694+ "text/plain": [
695+ "ok"
696+ ]
697+ },
698+ "metadata": {},
699+ "output_type": "display_data"
700+ }
701+ ],
702+ "source": [
703+ "sandwich := relation{tuple{name \"Cheese\", price 4},tuple{name \"Tuna\", price 5}}"
704+ ]
705+ },
706+ {
707+ "cell_type": "code",
708+ "execution_count": 20,
709+ "metadata": {},
710+ "outputs": [
711+ {
712+ "data": {
713+ "text/html": [
714+ "ok"
715+ ],
716+ "text/plain": [
717+ "ok"
718+ ]
719+ },
720+ "metadata": {},
721+ "output_type": "display_data"
722+ }
723+ ],
724+ "source": [
725+ "key sandwich_name{name} sandwich"
726+ ]
727+ },
728+ {
729+ "cell_type": "code",
730+ "execution_count": 21,
731+ "metadata": {},
732+ "outputs": [
733+ {
734+ "ename": "TutorialDError",
735+ "evalue": "",
736+ "output_type": "error",
737+ "traceback": [
738+ "InclusionDependencyCheckError \"sandwich_name\""
739+ ]
740+ }
741+ ],
742+ "source": [
743+ "insert sandwich relation{tuple{name \"Tuna\", price 6}}"
744+ ]
745+ },
746+ {
747+ "cell_type": "markdown",
748+ "metadata": {},
749+ "source": [
750+ "## Jupyter Kernel Features\n",
751+ "\n",
752+ "By default, the TutorialD kernel will automatically start a `project-m36-websocket-server` when the first TutorialD command is executed. For this to work, `project-m36-websocket-server` must be in the jupyter server's `PATH` environment variable.\n",
753+ "\n",
754+ "### Magic\n",
755+ "\n",
756+ "Like the python kernel, the TutorialD kernel includes some commands to interact directly with the kernel. These commands are not passed to the TutorialD interpreter.\n",
757+ "\n",
758+ "* `%help` brings up some help which includes links to additional documentation\n",
759+ "* `%connect ws://<host>:<port> <dbname>` connects to the `project-m36-websocket-server` already running. For example:\n",
760+ " ```\n",
761+ " %connect ws://localhost:64000 employees\n",
762+ " ```\n",
763+ " connects to the websocket server running on the localhost on port 64000 and selects the database named \"employees\". Note that the database name is not part of the websocket URL.\n",
764+ " \n",
765+ "## Conclusion\n",
766+ "\n",
767+ "[Project:M36](https://github.com/agentm/project-m36) is a fully-featured relational algebra engine suitable for use a database. It sets out to prove that sticking to the mathematical underpinnings of the relational algebra is straightforward and results in improved correctness and performance.\n",
768+ "\n",
769+ "If you would like to learn more, please refer to the [documentation](https://github.com/agentm/project-m36#documentation) and join our welcoming [community](https://github.com/agentm/project-m36#community) to ask questions."
770+ ]
771+ },
772+ {
773+ "cell_type": "code",
774+ "execution_count": null,
775+ "metadata": {},
776+ "outputs": [],
777+ "source": []
778+ }
779+ ],
780+ "metadata": {
781+ "kernelspec": {
782+ "display_name": "TutorialD (Project:M36)",
783+ "language": "TutorialD",
784+ "name": "tutd"
785+ },
786+ "language_info": {
787+ "file_extension": ".tutd",
788+ "mimetype": "text/x-tutd",
789+ "name": "TutorialD"
790+ }
791+ },
792+ "nbformat": 4,
793+ "nbformat_minor": 2
794+}
jupyter/itutd/ITutorialDKernel.pynew file+179
@@ -0,0 +1,179 @@
1+from ipykernel.kernelbase import Kernel
2+import subprocess
3+from websocket import create_connection, WebSocketConnectionClosedException, WebSocketBadStatusException
4+import time
5+import select
6+import json
7+import socket
8+import errno
9+import urlparse
10+
11+class ITutorialDKernel(Kernel):
12+ implementation = 'ITutorialD'
13+ implementation_version = '0.1'
14+
15+ banner = 'TutorialD kernel using Project:M36 https://github.com/agentm/project-m36'
16+
17+ language = 'TutorialD'
18+ language_version = '0.3'
19+ language_info = {
20+ 'name': 'TutorialD',
21+ 'mimetype': 'text/x-tutd',
22+ 'file_extension': '.tutd',
23+ }
24+ dbserver = None
25+ ws = None
26+
27+# todo: implement wrong database name handling
28+ def runtutd(self, tutd):
29+ #setup server
30+ dbname = 'jupyter'
31+ port = 63000
32+ if not self.ws and not self.dbserver:
33+ try:
34+ self.dbserver = subprocess.Popen(['project-m36-websocket-server',
35+ '--database', dbname,
36+ '--port', str(port)],
37+ )
38+ except OSError as err:
39+ if err.errno == errno.ENOENT:
40+ return ('"project-m36-websocket-server" is not in the PATH environment variable and could not be started.', None)
41+ else:
42+ raise
43+ res = self.connect_ws('ws://127.0.0.1:63000', dbname, retries=10)
44+ if res:
45+ return ('Connection failed: {}'.format(res), None)
46+
47+ self.ws.send('executetutd/html+text:' + tutd)
48+ try:
49+ jsonresult = self.discard_prompts()
50+ except WebSocketConnectionClosedException:
51+ self.ws = None
52+ return ('Websocket server closed the connection.',None)
53+ res = json.loads(jsonresult)
54+ if 'displayerror' in res:
55+ return (res['displayerror']['text'], None)
56+ elif 'acknowledged' in res:
57+ return (None, {'html':'ok', 'text':'ok'})
58+ else:
59+ return (None, res['displayrelation'])
60+
61+ def connect_ws(self, url, dbname, retries=0):
62+ while 1:
63+ try:
64+ ws = create_connection(url)
65+ except socket.error as err:
66+ if err.errno in (errno.ECONNREFUSED, ):
67+ time.sleep(1.0)
68+ if retries == 0:
69+ return 'Failed to connect to websocket.'
70+ retries -= 1
71+ else:
72+ raise
73+ except WebSocketBadStatusException:
74+ return 'Failed to negotiate websocket connection.'
75+ else:
76+ break
77+ self.ws = ws
78+ self.ws.send('connectdb:{}'.format(dbname))
79+ msg = json.loads(self.ws.recv())
80+ if 'displayerror' in msg:
81+ return msg['displayerror']['tag']
82+ return None
83+
84+ def discard_prompts(self):
85+ #read from the websocket until a non-prompt message is received
86+ while 1:
87+ sel = select.select([self.ws.sock],[],[],0)
88+ if len(sel[0]) > 0:
89+ #there is something to read
90+ msg = self.ws.recv()
91+ if 'promptInfo' not in msg:
92+ return msg
93+
94+ def send_error(self, msg):
95+ stream_content = {'ename':'TutorialDError',
96+ 'traceback':[msg],
97+ 'evalue':''}
98+ self.send_response(self.iopub_socket, 'error', stream_content)
99+
100+
101+ def process_magic(self, code):
102+ #handle "magic" processing of commands which are not sent to the tutd interpreter
103+ cmds = code.split(' ')
104+ ok = {'text':'ok', 'html':'ok'}
105+
106+ if cmds[0] == '%connect' and len(cmds) == 3:
107+ #connect to alternate database
108+ url = urlparse.urlparse(cmds[1])
109+ dbname = cmds[2]
110+ if not url.scheme.startswith('ws'):
111+ return ('Rejected attempt to connect to non-websocket. Use ws:// or wss:// scheme',None)
112+ res = self.connect_ws(url.geturl(), dbname)
113+ if res: #error from connection
114+ return (res, None, None)
115+ else: #connection successful
116+ return (None, ok, None)
117+ elif cmds[0] == '%help' and len(cmds) == 1:
118+ #display some help
119+ return (None, ok, self.show_help())
120+ elif cmds[0].startswith('%'):
121+ return ('Invalid magic command.', None)
122+
123+ def do_execute(self, code, silent,
124+ store_history=True,
125+ user_expressions=False,
126+ allow_stdin=False):
127+ magic = self.process_magic(code)
128+ payload = None
129+ if magic:
130+ (err, result, payload) = magic
131+ else:
132+ (err, result) = self.runtutd(code)
133+ if not silent:
134+ if err:
135+ status = 'error'
136+ self.send_error(err)
137+ else:
138+ status = 'ok'
139+ display_content = {
140+ 'data':{'text/html':result['html'],
141+ 'text/plain':result['text']},
142+ 'metadata':{},
143+ 'transient':{}
144+ }
145+ self.send_response(self.iopub_socket, 'display_data', display_content)
146+ ret ={'status': status,
147+ 'execution_count': self.execution_count,
148+ 'payload':[payload],
149+ 'user_expressions':{}}
150+ if payload:
151+ ret['payload'] = [payload]
152+ return ret
153+
154+ def do_shutdown(self, restart):
155+ if self.dbserver:
156+ self.dbserver.terminate()
157+ self.dbserver.kill()
158+
159+ def show_help(self):
160+ return {'source': 'page',
161+ 'start':0,
162+ 'data':{'text/html':'''<h1>Project:M36 TutorialD Jupyter Kernel Help</h1>
163+<p>TutorialD is an interactive language for the relational algebra.</p>
164+
165+<p><a href="https://github.com/agentm/project-m36/blob/master/docs/15_minute_tutorial.markdown">15 Minute TutorialD Introduction</a></p>
166+<p><a href="https://github.com/agentm/project-m36/blob/master/docs/tutd_tutorial.markdown">TutorialD Documentation</a></p>
167+''',
168+ 'text/plain':
169+'''Project:M36 TutorialD Jupyter Kernel Help
170+
171+TutorialD is an interactive language for the relational algebra.
172+
173+15 Minute TutorialD Introduction: https://github.com/agentm/project-m36/blob/master/docs/15_minute_tutorial.markdown
174+TutorialD Documentation: https://github.com/agentm/project-m36/blob/master/docs/tutd_tutorial.markdown
175+'''}}
176+
177+if __name__ == '__main__':
178+ from ipykernel.kernelapp import IPKernelApp
179+ IPKernelApp.launch_instance(kernel_class=ITutorialDKernel)
jupyter/itutd/__init__.pynew file+1
@@ -0,0 +1 @@
1+
jupyter/itutd/__main__.pynew file+4
@@ -0,0 +1,4 @@
1+from ipykernel.kernelapp import IPKernelApp
2+from . import ITutorialDKernel
3+
4+IPKernelApp.launch_instance(kernel_class=ITutorialDKernel)
jupyter/kernel.jsonnew file+5
@@ -0,0 +1,5 @@
1+{
2+ "language":"TutorialD",
3+ "display_name":"TutorialD (Project:M36)",
4+ "argv":["python", "-m", "itutd.ITutorialDKernel", "-f", "{connection_file}"]
5+}
jupyter/setup.pynew file+19
@@ -0,0 +1,19 @@
1+from setuptools import setup
2+
3+setup(
4+ name='itutd',
5+ version='0.1',
6+ packages=['itutd'],
7+ description='TutorialD Jupyter kernel for Project:M36',
8+ author='AgentM',
9+ author_email='agentm@themactionfaction.com',
10+ url='https://github.com/agentm/project-m36/jupyter/',
11+ install_requires=[
12+ 'jupyter_client', 'IPython', 'ipykernel', 'websocket-client'
13+ ],
14+ classifiers=[
15+ 'Intended Audience :: Developers',
16+ 'License :: OSI Approved :: Public Domain',
17+ 'Programming Language :: Python :: 2',
18+ ],
19+)
nix/sources.jsonnew file+50
@@ -0,0 +1,50 @@
1+{
2+ "curryer": {
3+ "branch": "master",
4+ "description": "Fast Haskell RPC",
5+ "homepage": null,
6+ "owner": "agentm",
7+ "repo": "curryer",
8+ "rev": "74ecaac619ad1165a4517d5c0f4e530493bda130",
9+ "sha256": "1izdvzj00k0y76ixm7dfgvq2fzphb8h4nzqgwkl3p0bg0806rsn1",
10+ "type": "tarball",
11+ "url": "https://github.com/agentm/curryer/archive/74ecaac619ad1165a4517d5c0f4e530493bda130.tar.gz",
12+ "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
13+ },
14+ "niv": {
15+ "branch": "master",
16+ "description": "Easy dependency management for Nix projects",
17+ "homepage": "https://github.com/nmattia/niv",
18+ "owner": "nmattia",
19+ "repo": "niv",
20+ "rev": "1819632b5823e0527da28ad82fecd6be5136c1e9",
21+ "sha256": "08jz17756qchq0zrqmapcm33nr4ms9f630mycc06i6zkfwl5yh5i",
22+ "type": "tarball",
23+ "url": "https://github.com/nmattia/niv/archive/1819632b5823e0527da28ad82fecd6be5136c1e9.tar.gz",
24+ "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
25+ },
26+ "nixpkgs": {
27+ "branch": "master",
28+ "description": "Nix Packages collection",
29+ "homepage": "",
30+ "owner": "NixOS",
31+ "repo": "nixpkgs",
32+ "rev": "429c23aad0fce9ef38b0e60d55d7459c19d53ddc",
33+ "sha256": "1nj8sh1fnxp07jdlvjkijwfd1pnsi2zj0ivy7a0dhx02g63byhg3",
34+ "type": "tarball",
35+ "url": "https://github.com/NixOS/nixpkgs/archive/429c23aad0fce9ef38b0e60d55d7459c19d53ddc.tar.gz",
36+ "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
37+ },
38+ "streamly": {
39+ "branch": "ac3af8749194f1788704dda8667d0b3807075cc2",
40+ "description": "Beautiful Streaming, Concurrent and Reactive Composition (Haskell)",
41+ "homepage": "https://hackage.haskell.org/package/streamly",
42+ "owner": "composewell",
43+ "repo": "streamly",
44+ "rev": "ac3af8749194f1788704dda8667d0b3807075cc2",
45+ "sha256": "04d8fk654vawdfs0dfidmq2awwgwi8x44iv8r7vqz70zkcsd5fij",
46+ "type": "tarball",
47+ "url": "https://github.com/composewell/streamly/archive/ac3af8749194f1788704dda8667d0b3807075cc2.tar.gz",
48+ "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
49+ }
50+}
nix/sources.nixnew file+171
@@ -0,0 +1,171 @@
1+# This file has been generated by Niv.
2+
3+let
4+
5+ #
6+ # The fetchers. fetch_<type> fetches specs of type <type>.
7+ #
8+
9+ fetch_file = pkgs: name: spec:
10+ let
11+ name' = sanitizeName name + "-src";
12+ in
13+ if spec.builtin or true then
14+ builtins_fetchurl { inherit (spec) url sha256; name = name'; }
15+ else
16+ pkgs.fetchurl { inherit (spec) url sha256; name = name'; };
17+
18+ fetch_tarball = pkgs: name: spec:
19+ let
20+ name' = sanitizeName name + "-src";
21+ in
22+ if spec.builtin or true then
23+ builtins_fetchTarball { name = name'; inherit (spec) url sha256; }
24+ else
25+ pkgs.fetchzip { name = name'; inherit (spec) url sha256; };
26+
27+ fetch_git = name: spec:
28+ let
29+ ref =
30+ if spec ? ref then spec.ref else
31+ if spec ? branch then "refs/heads/${spec.branch}" else
32+ if spec ? tag then "refs/tags/${spec.tag}" else
33+ abort "In git source '${name}': Please specify `ref`, `tag` or `branch`!";
34+ in
35+ builtins.fetchGit { url = spec.repo; inherit (spec) rev; inherit ref; };
36+
37+ fetch_local = spec: spec.path;
38+
39+ fetch_builtin-tarball = name: throw
40+ ''[${name}] The niv type "builtin-tarball" is deprecated. You should instead use `builtin = true`.
41+ $ niv modify ${name} -a type=tarball -a builtin=true'';
42+
43+ fetch_builtin-url = name: throw
44+ ''[${name}] The niv type "builtin-url" will soon be deprecated. You should instead use `builtin = true`.
45+ $ niv modify ${name} -a type=file -a builtin=true'';
46+
47+ #
48+ # Various helpers
49+ #
50+
51+ # https://github.com/NixOS/nixpkgs/pull/83241/files#diff-c6f540a4f3bfa4b0e8b6bafd4cd54e8bR695
52+ sanitizeName = name:
53+ (
54+ concatMapStrings (s: if builtins.isList s then "-" else s)
55+ (
56+ builtins.split "[^[:alnum:]+._?=-]+"
57+ ((x: builtins.elemAt (builtins.match "\\.*(.*)" x) 0) name)
58+ )
59+ );
60+
61+ # The set of packages used when specs are fetched using non-builtins.
62+ mkPkgs = sources: system:
63+ let
64+ sourcesNixpkgs =
65+ import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) { inherit system; };
66+ hasNixpkgsPath = builtins.any (x: x.prefix == "nixpkgs") builtins.nixPath;
67+ hasThisAsNixpkgsPath = <nixpkgs> == ./.;
68+ in
69+ if builtins.hasAttr "nixpkgs" sources
70+ then sourcesNixpkgs
71+ else if hasNixpkgsPath && ! hasThisAsNixpkgsPath then
72+ import <nixpkgs> {}
73+ else
74+ abort
75+ ''
76+ Please specify either <nixpkgs> (through -I or NIX_PATH=nixpkgs=...) or
77+ add a package called "nixpkgs" to your sources.json.
78+ '';
79+
80+ # The actual fetching function.
81+ fetch = pkgs: name: spec:
82+
83+ if ! builtins.hasAttr "type" spec then
84+ abort "ERROR: niv spec ${name} does not have a 'type' attribute"
85+ else if spec.type == "file" then fetch_file pkgs name spec
86+ else if spec.type == "tarball" then fetch_tarball pkgs name spec
87+ else if spec.type == "git" then fetch_git name spec
88+ else if spec.type == "local" then fetch_local spec
89+ else if spec.type == "builtin-tarball" then fetch_builtin-tarball name
90+ else if spec.type == "builtin-url" then fetch_builtin-url name
91+ else
92+ abort "ERROR: niv spec ${name} has unknown type ${builtins.toJSON spec.type}";
93+
94+ # If the environment variable NIV_OVERRIDE_${name} is set, then use
95+ # the path directly as opposed to the fetched source.
96+ replace = name: drv:
97+ let
98+ saneName = stringAsChars (c: if isNull (builtins.match "[a-zA-Z0-9]" c) then "_" else c) name;
99+ ersatz = builtins.getEnv "NIV_OVERRIDE_${saneName}";
100+ in
101+ if ersatz == "" then drv else ersatz;
102+
103+ # Ports of functions for older nix versions
104+
105+ # a Nix version of mapAttrs if the built-in doesn't exist
106+ mapAttrs = builtins.mapAttrs or (
107+ f: set: with builtins;
108+ listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set))
109+ );
110+
111+ # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/lists.nix#L295
112+ range = first: last: if first > last then [] else builtins.genList (n: first + n) (last - first + 1);
113+
114+ # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L257
115+ stringToCharacters = s: map (p: builtins.substring p 1 s) (range 0 (builtins.stringLength s - 1));
116+
117+ # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L269
118+ stringAsChars = f: s: concatStrings (map f (stringToCharacters s));
119+ concatMapStrings = f: list: concatStrings (map f list);
120+ concatStrings = builtins.concatStringsSep "";
121+
122+ # https://github.com/NixOS/nixpkgs/blob/8a9f58a375c401b96da862d969f66429def1d118/lib/attrsets.nix#L331
123+ optionalAttrs = cond: as: if cond then as else {};
124+
125+ # fetchTarball version that is compatible between all the versions of Nix
126+ builtins_fetchTarball = { url, name ? null, sha256 }@attrs:
127+ let
128+ inherit (builtins) lessThan nixVersion fetchTarball;
129+ in
130+ if lessThan nixVersion "1.12" then
131+ fetchTarball ({ inherit url; } // (optionalAttrs (!isNull name) { inherit name; }))
132+ else
133+ fetchTarball attrs;
134+
135+ # fetchurl version that is compatible between all the versions of Nix
136+ builtins_fetchurl = { url, name ? null, sha256 }@attrs:
137+ let
138+ inherit (builtins) lessThan nixVersion fetchurl;
139+ in
140+ if lessThan nixVersion "1.12" then
141+ fetchurl ({ inherit url; } // (optionalAttrs (!isNull name) { inherit name; }))
142+ else
143+ fetchurl attrs;
144+
145+ # Create the final "sources" from the config
146+ mkSources = config:
147+ mapAttrs (
148+ name: spec:
149+ if builtins.hasAttr "outPath" spec
150+ then abort
151+ "The values in sources.json should not have an 'outPath' attribute"
152+ else
153+ spec // { outPath = replace name (fetch config.pkgs name spec); }
154+ ) config.sources;
155+
156+ # The "config" used by the fetchers
157+ mkConfig =
158+ { sourcesFile ? if builtins.pathExists ./sources.json then ./sources.json else null
159+ , sources ? if isNull sourcesFile then {} else builtins.fromJSON (builtins.readFile sourcesFile)
160+ , system ? builtins.currentSystem
161+ , pkgs ? mkPkgs sources system
162+ }: rec {
163+ # The sources, i.e. the attribute set of spec name to spec
164+ inherit sources;
165+
166+ # The "pkgs" (evaluated nixpkgs) to use for e.g. non-builtin fetchers
167+ inherit pkgs;
168+ };
169+
170+in
171+mkSources (mkConfig {}) // { __functor = _: settings: mkSources (mkConfig settings); }
posts/2015-12-07-tu-quoque.htmlnew file+44
@@ -0,0 +1,44 @@
1+<!doctype html>
2+<html lang="en">
3+ <head>
4+ <meta charset="utf-8">
5+ <meta http-equiv="x-ua-compatible" content="ie=edge">
6+ <meta name="viewport" content="width=device-width, initial-scale=1">
7+ <title>Project:M36 Blog - Tu Quoque</title>
8+ <link rel="stylesheet" href="../css/brooklyn.css" />
9+ </head>
10+ <body>
11+ <div id="header">
12+ <div id="logo">
13+ <a href="../">Project:M36 Blog</a>
14+ </div>
15+ <div id="navigation">
16+ <a href="../">Home</a>
17+ <a href="../about.html">About</a>
18+ <a href="../contact.html">Contact</a>
19+ <a href="../archive.html">Archive</a>
20+ </div>
21+ </div>
22+
23+ <div id="content">
24+ <div class="info">
25+ Posted on December 7, 2015
26+
27+ by Julius
28+
29+</div>
30+
31+<p>Vestibulum leo turpis, dignissim quis ultrices sit amet, iaculis ac ligula. Pellentesque tristique, velit eget scelerisque scelerisque, est dolor ultrices arcu, quis ullamcorper justo arcu luctus mauris. Integer congue molestie nisi id posuere. Fusce pellentesque gravida tempus. Integer viverra tortor nec eros mollis quis convallis sem laoreet. Nulla id libero ac erat varius laoreet. Proin sed est est. Curabitur lacinia fermentum lorem, elementum malesuada ipsum malesuada ut. Donec suscipit elit id leo vehicula mattis non sed leo. Morbi varius eleifend varius. Nulla vestibulum, neque vitae aliquam eleifend, nisi tellus placerat nunc, quis suscipit elit turpis eu tortor. Etiam euismod convallis lectus quis venenatis. Phasellus laoreet magna in nibh cursus eu egestas nulla convallis. Aliquam vel ullamcorper risus. Fusce dictum, massa id consequat viverra, nulla ante tristique est, a faucibus nisi enim nec dui. Donec metus ligula, condimentum at porttitor eget, lobortis at quam.</p>
32+<p>Aenean vel libero in magna ultricies congue in a odio. Donec faucibus rutrum ornare. Fusce dictum eleifend fermentum. Vestibulum vel nibh a metus porttitor rhoncus. Pellentesque id quam neque, eget molestie arcu. Integer in elit vel neque viverra ultricies in eget massa. Nam ut convallis est. Pellentesque eros eros, sodales non vehicula et, tincidunt ut odio. Cras suscipit ultrices metus sit amet molestie. Fusce enim leo, vehicula sed sodales quis, adipiscing at ipsum.</p>
33+<p>Nunc tempor dignissim enim, sed tincidunt eros bibendum quis. Curabitur et dolor augue, id laoreet mi. Nulla cursus felis id dui vehicula vitae ornare lorem blandit. Cras eget dui nec odio volutpat pharetra. Fusce hendrerit justo justo, vel imperdiet enim. Vivamus elit risus, interdum ultrices accumsan eleifend, vestibulum vitae sapien. Integer bibendum ullamcorper tristique. Nulla quis odio lectus, quis eleifend augue. Integer a ligula mauris. Aenean et tempus tortor. Quisque at tortor mi. Vivamus accumsan feugiat est a blandit. Sed vitae enim ut dolor semper sodales. Duis tristique, ante et placerat elementum, nulla tellus pellentesque sapien, quis posuere velit mi eget nulla. Sed vestibulum nunc non est porttitor ut rutrum nibh semper. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.</p>
34+<p>Nulla adipiscing ultricies lobortis. Vivamus iaculis nisl vitae tellus laoreet vitae aliquet lacus mollis. Phasellus ut lacus urna, sed sagittis ante. Etiam consectetur pretium nisl sed dignissim. Pellentesque convallis, nisl eget commodo mollis, sem magna consequat arcu, sed pretium ipsum arcu sit amet neque. Aliquam erat volutpat. Morbi sed mi sed urna vestibulum placerat vitae vel metus. Fusce ac ante at justo pharetra vehicula. Vivamus vel tortor eget augue aliquet aliquet at vel odio. Nunc venenatis, magna quis facilisis fringilla, augue tellus varius neque, in vulputate est eros ut tortor. Duis lorem neque, aliquam congue posuere id, condimentum non dui. Phasellus ut dui massa, porttitor suscipit augue. Praesent quis tellus quam, vel volutpat metus. Vivamus enim est, aliquam in imperdiet et, sagittis eu ligula. Vestibulum hendrerit placerat orci et aliquet. Cras pharetra, dolor placerat lobortis tempor, metus odio cursus ligula, et posuere lacus ligula quis dui.</p>
35+<p>Donec a lectus eu nibh malesuada aliquam. Proin at metus quam, et tincidunt leo. Quisque lacus justo, scelerisque sodales pulvinar sed, dignissim ut sapien. Vivamus diam felis, adipiscing sollicitudin ultricies id, accumsan ac felis. In eu posuere ligula. Suspendisse potenti. Donec porttitor dictum dui id vehicula. Integer ante velit, congue id dictum et, adipiscing a tortor.</p>
36+
37+ </div>
38+
39+ <div id="footer">
40+ Site proudly generated by
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project-m36.cabal+305−214
@@ -1,109 +1,111 @@
1+Cabal-Version: 2.2
12Name: project-m36
2−Version: 0.1
3−License: PublicDomain
3+Version: 0.9.3
4+License: MIT
5+--note that this license specification is erroneous and only labeled MIT to appease hackage which does not recognize public domain packages in cabal >2.2- Project:M36 is dedicated to the public domain
46Build-Type: Simple
57Homepage: https://github.com/agentm/project-m36
68Bug-Reports: https://github.com/agentm/project-m36/issues
79Author: AgentM
810Stability: experimental
911Category: Relational Algebra
10−Cabal-Version: >= 1.10
12+Maintainer: agentm@themactionfaction.com
1113Synopsis: Relational Algebra Engine
1214Description: A relational algebra engine which can be used to persist and query Haskell data types.
15+Extra-Source-Files: Changelog.markdown README.markdown
16+
17+Source-Repository head
18+ Type: git
19+ location: https://github.com/agentm/project-m36
20+
21+Flag profiler
22+ Description: Enable Haskell-specific profiling support
23+ Default: False
24+ Manual: True
25+
26+--flag to allow stack to use its older, pinned packages
27+Flag stack
28+ Description: build with stack and stackage
29+ Manual: True
30+ Default: False
31+
32+Flag haskell-scripting
33+ Description: enables Haskell scripting which links against GHC as a library
34+ Manual: True
35+ Default: True
1336
1437Library
15− Build-Depends: base>=4.8 && < 4.9
16− ,ghc >= 7.8 && <= 8.0.1
17− ,ghc-paths
18− ,mtl
19− ,containers
20− ,unordered-containers
21− ,parsec
22− ,hashable
23− ,haskeline
24− ,directory
25− --critical uuid bug in lesser versions https://www.reddit.com/r/haskell/comments/4myot5/psa_make_sure_to_use_uuid_1312/
26− ,uuid >= 1.3.12
27− ,cassava ==0.4.*
28− ,text
29− ,bytestring
30− ,deepseq
31− ,deepseq-generics
32− ,vector
33− ,parallel
34− ,monad-parallel
35− ,transformers
36− ,gnuplot
37− ,binary
38− ,filepath
39− ,directory
40− ,vector-binary-instances
41− ,temporary
42− ,stm
43− ,time
44− ,hashable-time
45− ,old-locale
46− ,attoparsec
47− ,either
48− ,base64-bytestring
49− ,data-interval
50− ,extended-reals
51− ,network-transport
52−--required for persistent db driver
53− ,persistent >= 2.2 && < 2.3
54− ,persistent-template
55− ,aeson
56− ,path-pieces
57− ,conduit
58− ,resourcet
59− ,http-api-data
60−--needed for remote access
61− ,distributed-process-client-server
62− ,distributed-process-extras
63− ,distributed-process-async
64− ,distributed-process
65− ,network-transport-tcp
66− ,network-transport
67− ,distributed-process
68− ,stm-containers
69− ,list-t
70− ,optparse-applicative
71− ,Glob
38+ Build-Depends: base>=4.8 && < 4.15, ghc-paths, mtl, containers, unordered-containers, hashable, haskeline, directory, MonadRandom, random-shuffle, uuid >= 1.3.12, cassava >= 0.4.5.1 && < 0.6, text, bytestring, deepseq, deepseq-generics, vector, parallel, monad-parallel, exceptions, transformers, gnuplot, filepath, zlib, directory, temporary, stm, time, hashable-time, old-locale, rset, attoparsec, either, base64-bytestring, data-interval, extended-reals, aeson >= 1.1, path-pieces, conduit, resourcet, http-api-data, semigroups, QuickCheck, quickcheck-instances, list-t, stm-containers >= 0.2.15, foldl, optparse-applicative, Glob, cryptohash-sha256, text-manipulate >= 0.2.0.1 && < 0.4, winery, curryer-rpc, network, async, vector-instances, recursion-schemes, streamly >= 0.7.2, convertible
39+ if flag(haskell-scripting)
40+ Build-Depends: ghc >= 8.2 && < 8.11
41+ CPP-Options: -DPM36_HASKELL_SCRIPTING
42+ if impl(ghc>= 8) && flag(haskell-scripting)
43+ build-depends:
44+ ghc-boot, ghci
45+ if impl(ghc>= 8.6)
46+ Build-Depends: deferred-folds
7247 Exposed-Modules: ProjectM36.Error,
7348 ProjectM36.Transaction,
7449 ProjectM36.TransactionGraph,
7550 ProjectM36.TransactionGraph.Show,
7651 ProjectM36.TransactionGraph.Persist,
52+ ProjectM36.TransactionGraph.Merge,
53+ ProjectM36.TransGraphRelationalExpression,
7754 ProjectM36.Base,
55+ ProjectM36.Serialise.Base,
56+ ProjectM36.Serialise.Error,
57+ ProjectM36.DataFrame,
7858 ProjectM36.Attribute,
7959 ProjectM36.AttributeNames,
8060 ProjectM36.Tuple,
8161 ProjectM36.TupleSet,
8262 ProjectM36.Atom,
8363 ProjectM36.AtomFunction,
64+ ProjectM36.AtomFunctionError,
65+ ProjectM36.ScriptSession,
66+ ProjectM36.Shortcuts,
67+ ProjectM36.DatabaseContextFunction,
68+ ProjectM36.DatabaseContextFunctionError,
69+ ProjectM36.DatabaseContextFunctionUtils,
8470 ProjectM36.Key,
71+ ProjectM36.FunctionalDependency,
8572 ProjectM36.DatabaseContext,
8673 ProjectM36.DateExamples,
87− ProjectM36.AtomFunctionBody,
74+ ProjectM36.DisconnectedTransaction,
75+ ProjectM36.AtomFunctionBody,
8876 ProjectM36.RelationalExpression,
8977 ProjectM36.Relation.Show.HTML,
9078 ProjectM36.StaticOptimizer,
9179 ProjectM36.Relation.Show.Term,
80+ ProjectM36.WCWidth,
9281 ProjectM36.Relation.Show.CSV,
9382 ProjectM36.Relation.Show.Gnuplot,
9483 ProjectM36.Relation.Parse.CSV,
84+ ProjectM36.IsomorphicSchema,
85+ ProjectM36.InclusionDependency,
86+ ProjectM36.MerkleHash,
9587 ProjectM36.Client,
88+ ProjectM36.Client.Simple,
9689 ProjectM36.Persist,
9790 ProjectM36.AtomType,
91+ ProjectM36.AttributeExpr,
9892 ProjectM36.AtomFunctions.Basic,
9993 ProjectM36.AtomFunctions.Primitive,
100− ProjectM36.ConcreteTypeRep,
94+ ProjectM36.Atomable,
95+ ProjectM36.Tupleable,
96+ ProjectM36.Tupleable.Deriving,
10197 ProjectM36.DataConstructorDef,
10298 ProjectM36.DataTypes.Basic,
99+ ProjectM36.DataTypes.Sorting,
103100 ProjectM36.DataTypes.Day,
101+ ProjectM36.DataTypes.DateTime,
104102 ProjectM36.DataTypes.Either,
105103 ProjectM36.DataTypes.Maybe,
104+ ProjectM36.DataTypes.List,
105+ ProjectM36.DataTypes.NonEmptyList,
106106 ProjectM36.DataTypes.Primitive,
107+ ProjectM36.DataTypes.Interval,
108+ ProjectM36.DataTypes.ByteString,
107109 ProjectM36.MiscUtils,
108110 ProjectM36.Notifications,
109111 ProjectM36.Relation,
@@ -112,52 +114,60 @@ Library
112114 ProjectM36.Server.EntryPoints,
113115 ProjectM36.Server.ParseArgs,
114116 ProjectM36.Server.RemoteCallTypes,
117+ ProjectM36.Serialise.AtomFunctionError,
118+ ProjectM36.Serialise.DataFrame,
119+ ProjectM36.Serialise.DatabaseContextFunctionError,
120+ ProjectM36.Serialise.IsomorphicSchema,
115121 ProjectM36.Session,
116122 ProjectM36.Sessions,
117123 ProjectM36.Transaction.Persist,
118124 ProjectM36.TypeConstructor,
119125 ProjectM36.TypeConstructorDef,
120− ProjectM36.TransactionGraph.Merge
121− GHC-Options: -Wall -rtsopts
126+ ProjectM36.FileLock,
127+ ProjectM36.FSType,
128+ ProjectM36.Arbitrary,
129+ ProjectM36.GraphRefRelationalExpr,
130+ ProjectM36.NormalizeExpr,
131+ ProjectM36.TransactionInfo,
132+ ProjectM36.WithNameExpr
133+ GHC-Options: -Wall -rdynamic
122134 if os(windows)
123− Build-Depends: Win32 >= 2.3 && < 2.4
135+ Build-Depends: Win32 >= 2.5.4.1
124136 Other-Modules: ProjectM36.Win32Handle
125137 else
126− C-sources: cbits/DirectoryFsync.c
138+ --219- too many exported symbols under Windows and GHC 8.4
139+ GHC-Options: -rdynamic -fexternal-interpreter
140+ C-sources: cbits/DirectoryFsync.c, cbits/darwin_statfs.c
127141 Build-Depends: unix
128142 CC-Options: -fPIC
129143 Hs-Source-Dirs: ./src/lib
130144 Default-Language: Haskell2010
131− Default-Extensions: OverloadedStrings
145+ Default-Extensions: OverloadedStrings, CPP
146+ if !flag(stack)
147+ Build-Depends: deferred-folds
132148
133149Executable tutd
134− Build-Depends: base >=4.8 && <4.9,
135− ghc >= 7.8 && <= 8.0.1,
150+ if flag(haskell-scripting)
151+ Build-Depends: ghc >= 8.2 && < 8.11
152+ Build-Depends: base >=4.8 && <5.0,
136153 ghc-paths,
137− project-m36 == 0.1,
154+ project-m36,
138155 containers,
139156 unordered-containers,
140157 hashable,
141158 transformers,
159+ semigroups,
142160 mtl,
143161 uuid,
144162 deepseq-generics,
163+ MonadRandom, MonadRandom,
145164 vector,
146165 text,
147− vector-binary-instances,
148166 time,
149167 hashable-time,
150168 bytestring,
151− distributed-process-client-server,
152− distributed-process-extras,
153− distributed-process-async,
154− distributed-process,
155− network-transport-tcp,
156− network-transport,
157− distributed-process,
158169 stm,
159170 deepseq,
160− binary,
161171 data-interval,
162172 parallel,
163173 cassava,
@@ -165,20 +175,28 @@ Executable tutd
165175 directory,
166176 filepath,
167177 temporary,
168− parsec,
178+ megaparsec >= 5.2.0 && < 10,
169179 haskeline,
180+ random, MonadRandom,
170181 base64-bytestring,
171182 optparse-applicative,
172183 attoparsec,
173− stm-containers,
174− list-t
184+ stm-containers >= 1.0.0,
185+ list-t,
186+ parser-combinators,
187+ curryer-rpc,
188+ prettyprinter,
189+ cryptohash-sha256,
190+ --due to decode signature change
191+ base16-bytestring >= 1.0.0.0,
192+ http-conduit,
193+ modern-uri,
194+ http-types
175195 Other-Modules: TutorialD.Interpreter,
176196 TutorialD.Interpreter.Base,
177197 TutorialD.Interpreter.DatabaseContextExpr,
178198 TutorialD.Interpreter.RODatabaseContextOperator,
179199 TutorialD.Interpreter.TransactionGraphOperator,
180− TutorialD.Interpreter.DataTypes.Interval,
181− TutorialD.Interpreter.DataTypes.DateTime,
182200 TutorialD.Interpreter.Import.BasicExamples,
183201 TutorialD.Interpreter.InformationOperator,
184202 TutorialD.Interpreter.Export.Base,
@@ -188,36 +206,25 @@ Executable tutd
188206 TutorialD.Interpreter.Import.CSV,
189207 TutorialD.Interpreter.Import.TutorialD,
190208 TutorialD.Interpreter.RelationalExpr,
191− TutorialD.Interpreter.Types
209+ TutorialD.Interpreter.Types,
210+ TutorialD.Interpreter.SchemaOperator,
211+ TutorialD.Interpreter.TransGraphRelationalOperator,
212+ TutorialD.Interpreter.SchemaOperator
213+ TutorialD.Printer
192214 main-is: TutorialD/tutd.hs
193− CPP-Options: -DPROJECTM36_VERSION="v0.1"
194215 CC-Options: -fPIC
195− GHC-Options: -Wall
216+ GHC-Options: -Wall -threaded
196217 Hs-Source-Dirs: ./src/bin
197218 Default-Language: Haskell2010
198219 Default-Extensions: OverloadedStrings
199−-- if os(windows)
200−-- Build-Depends: Win32 >= 2.3 && < 2.4
201−-- Other-Modules: ProjectM36.Win32Handle
202−-- else
203−-- C-sources: ProjectM36/DirectoryFsync.c
204−-- Build-Depends: unix
205−
206220
207221Executable project-m36-server
222+ if flag(haskell-scripting)
223+ Build-Depends: ghc >= 8.2 && < 8.11
208224 Build-Depends: base,
209− ghc >= 7.8 && <= 8.0.1,
210225 ghc-paths,
211− project-m36 == 0.1,
212− distributed-process-client-server,
213− distributed-process-extras,
214− distributed-process-async,
215− distributed-process,
216− network-transport-tcp,
217− network-transport,
218− distributed-process,
219− binary,
220226 transformers,
227+ project-m36,
221228 temporary,
222229 data-interval,
223230 deepseq,
@@ -230,7 +237,6 @@ Executable project-m36-server
230237 optparse-applicative,
231238 hashable-time,
232239 time,
233− vector-binary-instances,
234240 text,
235241 deepseq-generics,
236242 mtl,
@@ -243,181 +249,266 @@ Executable project-m36-server
243249 list-t,
244250 base64-bytestring
245251 Main-Is: ./src/bin/ProjectM36/Server/project-m36-server.hs
246− CPP-Options: -DPROJECTM36_VERSION="v0.1"
247252 GHC-Options: -Wall -threaded -rtsopts
248− GHC-Prof-Options: -fprof-auto -rtsopts -threaded -Wall
253+ if flag(profiler)
254+ GHC-Prof-Options: -fprof-auto -rtsopts -threaded -Wall
249255 Default-Language: Haskell2010
250256 Default-Extensions: OverloadedStrings
251257
252258Executable bigrel
253259 Default-Language: Haskell2010
254260 Default-Extensions: OverloadedStrings
255− Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, vector-binary-instances, time, hashable-time, bytestring, network-transport-tcp, distributed-process, distributed-process-extras, distributed-process-client-server, uuid, stm, deepseq, deepseq-generics, binary, parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, parsec, text, base64-bytestring, data-interval, filepath, optparse-applicative, stm-containers, list-t, ghc, ghc-paths, transformers, project-m36 == 0.1
261+ Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, time, hashable-time, bytestring, uuid, stm, deepseq, deepseq-generics, parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, megaparsec, text, base64-bytestring, data-interval, filepath, optparse-applicative, stm-containers, list-t, ghc, ghc-paths, transformers, project-m36, random, MonadRandom, semigroups, parser-combinators
256262 Other-Modules: TutorialD.Interpreter.Base,
257263 TutorialD.Interpreter.DatabaseContextExpr,
258264 TutorialD.Interpreter.RelationalExpr,
259265 TutorialD.Interpreter.Types
260266 main-is: benchmark/bigrel.hs
261267 GHC-Options: -Wall -threaded -rtsopts
262− CPP-Options: -DPROJECTM36_VERSION="v0.1"
263268 HS-Source-Dirs: ./src/bin
264− GHC-Prof-Options: -fprof-auto -rtsopts -threaded -Wall
269+ if flag(profiler)
270+ GHC-Prof-Options: -fprof-auto -rtsopts -threaded -Wall
265271
266−Test-Suite test-tutoriald
272+Common commontest
267273 Default-Language: Haskell2010
274+ Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, time, hashable-time, bytestring, uuid, stm, deepseq, deepseq-generics,parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, megaparsec, text, base64-bytestring, data-interval, filepath, transformers, stm-containers, list-t, websockets, optparse-applicative, network, aeson, project-m36, random, MonadRandom, semigroups, parser-combinators, winery, curryer-rpc, prettyprinter, base64-bytestring, modern-uri, http-types, http-conduit, base16-bytestring,cryptohash-sha256
268275 Default-Extensions: OverloadedStrings
269− type: exitcode-stdio-1.0
270− main-is: test/TutorialD/Interpreter.hs
271− Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, vector-binary-instances, time, hashable-time, bytestring, network-transport-tcp, distributed-process, distributed-process-extras, distributed-process-client-server, uuid, stm, deepseq, deepseq-generics, binary, parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, parsec, text, base64-bytestring, data-interval, filepath, stm-containers, list-t, project-m36 == 0.1
272− Other-Modules: TutorialD.Interpreter, TutorialD.Interpreter.Base, TutorialD.Interpreter.Export.Base, TutorialD.Interpreter.Export.CSV, TutorialD.Interpreter.Import.Base, TutorialD.Interpreter.Import.CSV, TutorialD.Interpreter.Import.TutorialD, TutorialD.Interpreter.RODatabaseContextOperator, TutorialD.Interpreter.RelationalExpr, TutorialD.Interpreter.TransactionGraphOperator, TutorialD.Interpreter.Types, TutorialD.Interpreter.DatabaseContextExpr, TutorialD.Interpreter.InformationOperator, TutorialD.Interpreter.Import.BasicExamples
273− GHC-Options: -Wall
274− Hs-Source-Dirs: ./src/bin, ., test
275− CPP-Options: -DPROJECTM36_VERSION="v0.1"
276+ GHC-Options: -Wall -threaded
277+ Hs-Source-Dirs: test, src/bin
276278
277−Test-Suite test-tutoriald-atomfunctionscript
279+Benchmark basic-benchmark
278280 Default-Language: Haskell2010
279281 Default-Extensions: OverloadedStrings
282+ Build-Depends: base, criterion, project-m36, text, vector, transformers, containers, temporary, directory, filepath
283+ Main-Is: benchmark/Basic.hs
284+ Type: exitcode-stdio-1.0
285+ GHC-Options: -Wall -threaded -rtsopts
286+ HS-Source-Dirs: ./src/bin
287+ if flag(profiler)
288+ GHC-Prof-Options: -fprof-auto -rtsopts -threaded -Wall
289+
290+--benchmark inserts, updates, deletes for a basic use-case to shake out any space leaks
291+Benchmark update-exprs
292+ Default-Language: Haskell2010
293+ Default-Extensions: OverloadedStrings
294+ Build-Depends: base, criterion, project-m36, text, winery
295+ Main-Is: benchmark/Server.hs
296+ Type: exitcode-stdio-1.0
297+ GHC-Options: -Wall -threaded -rtsopts
298+ HS-Source-Dirs: ./src/bin
299+ if flag(profiler)
300+ GHC-Prof-Options: -fprof-auto -rtsopts -threaded -Wall -fexternal-interpreter
301+
302+Test-Suite test-tutoriald
303+ import: commontest
304+ type: exitcode-stdio-1.0
305+ main-is: TutorialD/InterpreterTest.hs
306+ Other-Modules: TutorialD.Interpreter, TutorialD.Interpreter.Base, TutorialD.Interpreter.Export.Base, TutorialD.Interpreter.Export.CSV, TutorialD.Interpreter.Import.Base, TutorialD.Interpreter.Import.CSV, TutorialD.Interpreter.Import.TutorialD, TutorialD.Interpreter.RODatabaseContextOperator, TutorialD.Interpreter.RelationalExpr, TutorialD.Interpreter.TransactionGraphOperator, TutorialD.Interpreter.Types, TutorialD.Interpreter.DatabaseContextExpr, TutorialD.Interpreter.InformationOperator, TutorialD.Interpreter.Import.BasicExamples, TutorialD.Interpreter.DatabaseContextIOOperator, TutorialD.Interpreter.TestBase, TutorialD.Interpreter.TransGraphRelationalOperator, TutorialD.Interpreter.SchemaOperator, TutorialD.Printer
307+ Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, time, hashable-time, bytestring, uuid, stm, deepseq, deepseq-generics, parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, megaparsec, text, base64-bytestring, data-interval, filepath, stm-containers, list-t, project-m36, random, MonadRandom, semigroups, parser-combinators, prettyprinter
308+
309+Test-Suite test-tutoriald-atomfunctionscript
310+ import: commontest
311+ type: exitcode-stdio-1.0
312+ Other-Modules: TutorialD.Interpreter, TutorialD.Interpreter.Base, TutorialD.Interpreter.DatabaseContextExpr, TutorialD.Interpreter.DatabaseContextIOOperator, TutorialD.Interpreter.Export.Base, TutorialD.Interpreter.Export.CSV, TutorialD.Interpreter.Import.Base, TutorialD.Interpreter.Import.BasicExamples, TutorialD.Interpreter.Import.CSV, TutorialD.Interpreter.Import.TutorialD, TutorialD.Interpreter.InformationOperator, TutorialD.Interpreter.RODatabaseContextOperator, TutorialD.Interpreter.RelationalExpr, TutorialD.Interpreter.TestBase, TutorialD.Interpreter.TransGraphRelationalOperator, TutorialD.Interpreter.TransactionGraphOperator, TutorialD.Interpreter.Types, TutorialD.Interpreter.SchemaOperator, TutorialD.Printer
313+ main-is: TutorialD/Interpreter/AtomFunctionScript.hs
314+
315+Test-Suite test-tutoriald-databasecontextfunctionscript
316+ import: commontest
280317 type: exitcode-stdio-1.0
281− main-is: test/TutorialD/Interpreter/AtomFunctionScript.hs
282− Build-Depends: base, HUnit, project-m36 == 0.1, uuid, containers, parsec, text, vector, directory, bytestring, mtl, haskeline
283− GHC-Options: -Wall
284− Hs-Source-Dirs: ./src/bin, ./test, .
285− CPP-Options: -DPROJECTM36_VERSION="v0.1"
318+ Other-Modules: TutorialD.Interpreter, TutorialD.Interpreter.Base, TutorialD.Interpreter.DatabaseContextExpr, TutorialD.Interpreter.DatabaseContextIOOperator, TutorialD.Interpreter.Export.Base, TutorialD.Interpreter.Export.CSV, TutorialD.Interpreter.Import.Base, TutorialD.Interpreter.Import.BasicExamples, TutorialD.Interpreter.Import.CSV, TutorialD.Interpreter.Import.TutorialD, TutorialD.Interpreter.InformationOperator, TutorialD.Interpreter.RODatabaseContextOperator, TutorialD.Interpreter.RelationalExpr, TutorialD.Interpreter.TestBase, TutorialD.Interpreter.TransGraphRelationalOperator, TutorialD.Interpreter.TransactionGraphOperator, TutorialD.Interpreter.Types, TutorialD.Interpreter.SchemaOperator, TutorialD.Printer
319+ main-is: TutorialD/Interpreter/DatabaseContextFunctionScript.hs
286320
287321Test-Suite test-relation
288− Default-Language: Haskell2010
289− Default-Extensions: OverloadedStrings
322+ import: commontest
290323 type: exitcode-stdio-1.0
291− main-is: test/Relation/Basic.hs
292− Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, vector-binary-instances, time, hashable-time, bytestring, network-transport-tcp, distributed-process, distributed-process-extras, distributed-process-client-server, uuid, stm, deepseq, deepseq-generics, binary, parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, parsec, text, base64-bytestring, data-interval, filepath, stm-containers, project-m36 == 0.1
293− GHC-Options: -Wall
324+ main-is: Relation/Basic.hs
294325
295326Test-Suite test-static-optimizer
296− Default-Language: Haskell2010
297− Default-Extensions: OverloadedStrings
327+ import: commontest
298328 type: exitcode-stdio-1.0
299− main-is: test/Relation/StaticOptimizer.hs
300− Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, vector-binary-instances, time, hashable-time, bytestring, network-transport-tcp, distributed-process, distributed-process-extras, distributed-process-client-server, uuid, stm, deepseq, deepseq-generics, binary, parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, parsec, text, base64-bytestring, data-interval, filepath, stm-containers, project-m36 == 0.1
301− GHC-Options: -Wall
302− CPP-Options: -DPROJECTM36_VERSION="v0.1"
329+ main-is: Relation/StaticOptimizer.hs
303330
304331Test-Suite test-transactiongraph-persist
305− Default-Language: Haskell2010
306− Default-Extensions: OverloadedStrings
332+ import: commontest
307333 type: exitcode-stdio-1.0
308− main-is: test/TransactionGraph/Persist.hs
309− Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, vector-binary-instances, time, hashable-time, bytestring, network-transport-tcp, distributed-process, distributed-process-extras, distributed-process-client-server, uuid, stm, deepseq, deepseq-generics, binary, parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, parsec, text, base64-bytestring, data-interval, filepath, stm-containers, project-m36 == 0.1
310− Other-Modules: TutorialD.Interpreter.Base, TutorialD.Interpreter.RelationalExpr, TutorialD.Interpreter.Types, TutorialD.Interpreter.DatabaseContextExpr, TutorialD.Interpreter.Import.BasicExamples
311− Hs-Source-Dirs: ., ./src/bin
312− GHC-Options: -Wall
334+ main-is: TransactionGraph/Persist.hs
335+ Other-Modules: TutorialD.Interpreter.Base, TutorialD.Interpreter.RelationalExpr, TutorialD.Interpreter.Types, TutorialD.Interpreter.DatabaseContextExpr, TutorialD.Interpreter.Import.BasicExamples, TutorialD.Printer
313336
314337Test-Suite test-relation-import-csv
315− Default-Language: Haskell2010
316− Default-Extensions: OverloadedStrings
338+ import: commontest
317339 type: exitcode-stdio-1.0
318− main-is: test/Relation/Import/CSV.hs
319− Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, vector-binary-instances, time, hashable-time, bytestring, network-transport-tcp, distributed-process, distributed-process-extras, distributed-process-client-server, uuid, stm, deepseq, deepseq-generics, binary, parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, parsec, text, base64-bytestring, data-interval, filepath, stm-containers, project-m36 == 0.1
320− GHC-Options: -Wall
321− CPP-Options: -DPROJECTM36_VERSION="v0.1"
340+ main-is: Relation/Import/CSV.hs
322341
323342Test-Suite test-tutoriald-import-tutoriald
324− Default-Language: Haskell2010
325− Default-Extensions: OverloadedStrings
343+ import: commontest
326344 type: exitcode-stdio-1.0
327− main-is: test/TutorialD/Interpreter/Import/TutorialD.hs
328− Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, vector-binary-instances, time, hashable-time, bytestring, network-transport-tcp, distributed-process, distributed-process-extras, distributed-process-client-server, uuid, stm, deepseq, deepseq-generics, binary, parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, parsec, text, base64-bytestring, data-interval, filepath, stm-containers, project-m36 == 0.1
329− Other-Modules: TutorialD.Interpreter.Base, TutorialD.Interpreter.Import.Base, TutorialD.Interpreter.Import.TutorialD, TutorialD.Interpreter.RelationalExpr, TutorialD.Interpreter.Types, TutorialD.Interpreter.DatabaseContextExpr, TutorialD.Interpreter.Import.BasicExamples
330− GHC-Options: -Wall
331− Hs-Source-Dirs: ., ./src/bin
345+ main-is: TutorialD/Interpreter/Import/ImportTest.hs
346+ Other-Modules: TutorialD.Interpreter.Base, TutorialD.Interpreter.Import.Base, TutorialD.Interpreter.Import.TutorialD, TutorialD.Interpreter.RelationalExpr, TutorialD.Interpreter.Types, TutorialD.Interpreter.DatabaseContextExpr, TutorialD.Interpreter.Import.BasicExamples, TutorialD.Printer
332347
333348Test-Suite test-relation-export-csv
334− Default-Language: Haskell2010
335− Default-Extensions: OverloadedStrings
349+ import: commontest
336350 type: exitcode-stdio-1.0
337− main-is: test/Relation/Export/CSV.hs
338− Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, vector-binary-instances, time, hashable-time, bytestring, network-transport-tcp, distributed-process, distributed-process-extras, distributed-process-client-server, uuid, stm, deepseq, deepseq-generics, binary, parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, parsec, text, base64-bytestring, data-interval, filepath, stm-containers, project-m36 == 0.1
339− GHC-Options: -Wall
351+ main-is: Relation/Export/CSV.hs
340352
341−Test-Suite test-persistent-driver
342− Default-Language: Haskell2010
343− Default-Extensions: OverloadedStrings
344− type: exitcode-stdio-1.0
345− main-is: test/persistent-driver/test.hs
346− Other-Modules: Database.Persist.ProjectM36
347− Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, vector-binary-instances, time, hashable-time, bytestring, network-transport-tcp, distributed-process, distributed-process-extras, distributed-process-client-server, uuid, stm, deepseq, deepseq-generics, binary, parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, parsec, text, base64-bytestring, data-interval, filepath, template-haskell, transformers, aeson, persistent-template, conduit, persistent >= 2.2 && < 2.3, either, path-pieces, http-api-data, stm-containers, list-t, project-m36 == 0.1
348− Hs-Source-Dirs: ., src/persistent
349− GHC-Options: -Wall
350−
351353Test-Suite test-transactiongraph-merge
352− Default-Language: Haskell2010
353− Default-Extensions: OverloadedStrings
354+ import: commontest
354355 type: exitcode-stdio-1.0
355− main-is: test/TransactionGraph/Merge.hs
356− Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, vector-binary-instances, time, hashable-time, bytestring, network-transport-tcp, distributed-process, distributed-process-extras, distributed-process-client-server, uuid, stm, deepseq, deepseq-generics, binary, parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, parsec, text, base64-bytestring, data-interval, filepath, template-haskell, transformers, aeson, persistent-template, conduit, persistent, either, path-pieces, http-api-data, stm-containers, list-t, project-m36 == 0.1
357− GHC-Options: -Wall
356+ main-is: TransactionGraph/Merge.hs
357+
358+
359+Test-Suite test-prettyprinter
360+ import: commontest
361+ type: exitcode-stdio-1.0
362+ main-is: TutorialD/PrinterTest.hs
363+ Other-Modules: TutorialD.Printer, TutorialD.Interpreter.Base, TutorialD.Interpreter.RelationalExpr, TutorialD.Interpreter.Types
358364
359365benchmark bench
360− Default-Language: Haskell2010
361− Default-Extensions: OverloadedStrings
366+ import: commontest
362367 type: exitcode-stdio-1.0
363368 main-is: benchmark/Relation.hs
364− Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, vector-binary-instances, time, hashable-time, bytestring, network-transport-tcp, distributed-process, distributed-process-extras, distributed-process-client-server, uuid, stm, deepseq, deepseq-generics, binary, parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, parsec, text, base64-bytestring, data-interval, filepath, criterion, stm-containers, project-m36 == 0.1
365− GHC-Options: -Wall -rtsopts
366− Hs-Source-Dirs: ./src/bin
367369
368370Test-Suite test-server
369− Default-Language: Haskell2010
370− Default-Extensions: OverloadedStrings
371+ import: commontest
371372 type: exitcode-stdio-1.0
372− main-is: test/Server/Main.hs
373− Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, vector-binary-instances, time, hashable-time, bytestring, network-transport-tcp, distributed-process, distributed-process-extras, distributed-process-client-server, uuid, stm, deepseq, deepseq-generics, binary, parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, parsec, text, base64-bytestring, data-interval, filepath, transformers, stm-containers, list-t, project-m36 == 0.1
374− HS-Source-Dirs: ., ./src/bin
375− GHC-Options: -Wall
376−
373+ main-is: Server/Main.hs
374+
375+
377376Executable Example-SimpleClient
378377 Default-Language: Haskell2010
379378 Default-Extensions: OverloadedStrings
380− Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, vector-binary-instances, time, hashable-time, bytestring, network-transport-tcp, distributed-process, distributed-process-extras, distributed-process-client-server, uuid, stm, deepseq, deepseq-generics, binary, parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, parsec, text, base64-bytestring, data-interval, filepath, transformers, stm-containers, list-t, ghc, ghc-paths, project-m36 == 0.1
379+ Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, time, hashable-time, bytestring, uuid, stm, deepseq, deepseq-generics,parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, megaparsec, text, base64-bytestring, data-interval, filepath, transformers, stm-containers, list-t, ghc, ghc-paths, project-m36, random, MonadRandom
381380 Main-Is: examples/SimpleClient.hs
382− GHC-Options: -Wall
381+ GHC-Options: -Wall -threaded
383382
384−Executable Example-PersistClient
383+Executable Example-OutOfTheTarpit
385384 Default-Language: Haskell2010
386385 Default-Extensions: OverloadedStrings
387− Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, vector-binary-instances, time, hashable-time, bytestring, network-transport-tcp, distributed-process, distributed-process-extras, distributed-process-client-server, uuid, stm, deepseq, deepseq-generics, binary, parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, parsec, text, base64-bytestring, data-interval, filepath, transformers, stm-containers, list-t, persistent, aeson, path-pieces, either, conduit, http-api-data, template-haskell, persistent-template, ghc, ghc-paths, project-m36 == 0.1
388− Main-Is: examples/PersistClient.hs
389− GHC-Options: -Wall
390− CPP-Options: -DPROJECTM36_VERSION="v0.1"
391− Other-Modules: Database.Persist.ProjectM36
392− Hs-Source-Dirs: ./src/persistent, .
393−
394−Test-Suite test-scripts
386+ Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, time, hashable-time, bytestring, uuid, stm, deepseq, deepseq-generics,parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, megaparsec, text, base64-bytestring, data-interval, filepath, transformers, stm-containers, list-t, aeson, path-pieces, either, conduit, http-api-data, template-haskell, ghc, ghc-paths, project-m36, winery
387+ Main-Is: examples/out_of_the_tarpit.hs
388+ GHC-Options: -Wall -threaded
389+
390+Executable Example-Blog
391+ Default-Language: Haskell2010
392+ Default-Extensions: OverloadedStrings
393+ Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, time, hashable-time, bytestring, uuid, stm, deepseq, deepseq-generics,parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, megaparsec, text, base64-bytestring, data-interval, filepath, transformers, stm-containers, list-t, aeson, path-pieces, either, conduit, http-api-data, template-haskell, ghc, ghc-paths, project-m36, scotty, blaze-html, http-types, winery
394+ Main-Is: examples/blog.hs
395+ GHC-Options: -Wall -threaded
396+
397+Executable Example-Hair
395398 Default-Language: Haskell2010
396399 Default-Extensions: OverloadedStrings
400+ Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, time, hashable-time, bytestring, uuid, stm, deepseq, deepseq-generics,parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, megaparsec, text, base64-bytestring, data-interval, filepath, transformers, stm-containers, list-t, aeson, path-pieces, either, conduit, http-api-data, template-haskell, ghc, ghc-paths, project-m36, winery
401+ Main-Is: examples/hair.hs
402+ GHC-Options: -Wall -threaded
403+
404+Executable Example-Plantfarm
405+ Default-Language: Haskell2010
406+ Default-Extensions: OverloadedStrings
407+ Build-Depends: aeson, barbies, base, binary, containers, deepseq, hashable, project-m36, random, scotty, text, winery
408+ Main-Is: examples/Plantfarm.hs
409+ GHC-Options: -Wall -threaded
410+
411+Executable Example-CustomTupleable
412+ Default-Language: Haskell2010
413+ Default-Extensions: OverloadedStrings
414+ Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, time, hashable-time, bytestring, uuid, stm, deepseq, deepseq-generics,parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, megaparsec, text, base64-bytestring, data-interval, filepath, transformers, stm-containers, list-t, aeson, path-pieces, either, conduit, http-api-data, template-haskell, ghc, ghc-paths, project-m36, winery
415+ Main-Is: examples/CustomTupleable.hs
416+ GHC-Options: -Wall -threaded
417+
418+Executable Example-DerivingCustomTupleable
419+ if impl(ghc>=8.6)
420+ Buildable: True
421+ else
422+ Buildable: False
423+ Default-Language: Haskell2010
424+ Build-Depends: base, text, deepseq, project-m36, winery
425+ Main-Is: examples/DerivingCustomTupleable.hs
426+ GHC-Options: -Wall -threaded
427+
428+Test-Suite test-scripts
429+ import: commontest
397430 type: exitcode-stdio-1.0
398− main-is: test/scripts.hs
399− Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, vector-binary-instances, time, hashable-time, bytestring, network-transport-tcp, distributed-process, distributed-process-extras, distributed-process-client-server, uuid, stm, deepseq, deepseq-generics, binary, parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, parsec, text, base64-bytestring, data-interval, filepath, transformers, stm-containers, list-t, project-m36 == 0.1
400− Other-Modules: TutorialD.Interpreter.Base, TutorialD.Interpreter.DatabaseContextExpr, TutorialD.Interpreter.Import.Base, TutorialD.Interpreter.Import.TutorialD, TutorialD.Interpreter.RelationalExpr, TutorialD.Interpreter.Types, TutorialD.Interpreter.Import.BasicExamples
401− GHC-Options: -Wall
402− Hs-Source-Dirs: ., ./src/bin
431+ main-is: scripts.hs
432+ Other-Modules: TutorialD.Interpreter.Base, TutorialD.Interpreter.DatabaseContextExpr, TutorialD.Interpreter.Import.Base, TutorialD.Interpreter.Import.TutorialD, TutorialD.Interpreter.RelationalExpr, TutorialD.Interpreter.Types, TutorialD.Interpreter.Import.BasicExamples, TutorialD.Printer
403433
404434Executable project-m36-websocket-server
405435 Default-Language: Haskell2010
406− Build-Depends: base, aeson, path-pieces, either, conduit, http-api-data, template-haskell, persistent-template, websockets, aeson, uuid-aeson, optparse-applicative, project-m36 == 0.1, containers, bytestring, text, vector, uuid, parsec, haskeline, mtl, directory, base64-bytestring
436+ Build-Depends: base, aeson, path-pieces, either, conduit, http-api-data, template-haskell, websockets, aeson, optparse-applicative, project-m36, containers, bytestring, text, vector, uuid, megaparsec, haskeline, mtl, directory, base64-bytestring, random, MonadRandom, time, semigroups, attoparsec, parser-combinators, prettyprinter, network, modern-uri, http-conduit, base16-bytestring, http-types, cryptohash-sha256, wai, wai-websockets, warp, warp-tls
407437 Main-Is: ProjectM36/Server/WebSocket/websocket-server.hs
408− Other-Modules: ProjectM36.Client.Json, ProjectM36.Server.RemoteCallTypes.Json, ProjectM36.Server.WebSocket, TutorialD.Interpreter, TutorialD.Interpreter.Base, TutorialD.Interpreter.DatabaseContextExpr, TutorialD.Interpreter.DatabaseContextIOOperator, TutorialD.Interpreter.Export.Base, TutorialD.Interpreter.Export.CSV, TutorialD.Interpreter.Import.Base, TutorialD.Interpreter.Import.BasicExamples, TutorialD.Interpreter.Import.CSV, TutorialD.Interpreter.Import.TutorialD, TutorialD.Interpreter.InformationOperator, TutorialD.Interpreter.RODatabaseContextOperator, TutorialD.Interpreter.RelationalExpr, TutorialD.Interpreter.TransactionGraphOperator, TutorialD.Interpreter.Types
409− GHC-Options: -Wall
410− CPP-Options: -DPROJECTM36_VERSION="v0.1"
438+ Other-Modules: ProjectM36.Client.Json, ProjectM36.Server.RemoteCallTypes.Json, ProjectM36.Server.WebSocket, TutorialD.Interpreter, TutorialD.Interpreter.Base, TutorialD.Interpreter.DatabaseContextExpr, TutorialD.Interpreter.DatabaseContextIOOperator, TutorialD.Interpreter.Export.Base, TutorialD.Interpreter.Export.CSV, TutorialD.Interpreter.Import.Base, TutorialD.Interpreter.Import.BasicExamples, TutorialD.Interpreter.Import.CSV, TutorialD.Interpreter.Import.TutorialD, TutorialD.Interpreter.InformationOperator, TutorialD.Interpreter.RODatabaseContextOperator, TutorialD.Interpreter.RelationalExpr, TutorialD.Interpreter.TransactionGraphOperator, TutorialD.Interpreter.Types, TutorialD.Interpreter.TransGraphRelationalOperator, TutorialD.Interpreter.SchemaOperator, TutorialD.Printer
439+ GHC-Options: -Wall -threaded
411440 Hs-Source-Dirs: ./src/bin
412441 Default-Extensions: OverloadedStrings
413442
414443Test-Suite test-websocket-server
415− Default-Language: Haskell2010
444+ import: commontest
445+ type: exitcode-stdio-1.0
446+ main-is: Server/WebSocket.hs
447+ Other-Modules: TutorialD.Interpreter.Export.Base, TutorialD.Interpreter.Export.CSV, TutorialD.Interpreter.Import.BasicExamples, TutorialD.Interpreter.Import.CSV, TutorialD.Interpreter.InformationOperator, TutorialD.Interpreter.RODatabaseContextOperator, TutorialD.Interpreter.TransactionGraphOperator, ProjectM36.Client.Json, ProjectM36.Server.RemoteCallTypes.Json, ProjectM36.Server.WebSocket, TutorialD.Interpreter, TutorialD.Interpreter.Base, TutorialD.Interpreter.DatabaseContextExpr, TutorialD.Interpreter.Import.Base, TutorialD.Interpreter.Import.TutorialD, TutorialD.Interpreter.RelationalExpr, TutorialD.Interpreter.Types, TutorialD.Interpreter.DatabaseContextIOOperator, TutorialD.Interpreter.TransGraphRelationalOperator, TutorialD.Interpreter.SchemaOperator, TutorialD.Printer
448+
449+Test-Suite test-isomorphic-schemas
450+ import: commontest
451+ type: exitcode-stdio-1.0
452+ main-is: IsomorphicSchema.hs
453+
454+Test-Suite test-atomable
455+ import: commontest
416456 type: exitcode-stdio-1.0
417− main-is: test/Server/WebSocket.hs
418− Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, vector-binary-instances, time, hashable-time, bytestring, network-transport-tcp, distributed-process, distributed-process-extras, distributed-process-client-server, uuid, stm, deepseq, deepseq-generics, binary, parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, parsec, text, base64-bytestring, data-interval, filepath, transformers, stm-containers, list-t, websockets, optparse-applicative, network, aeson, uuid-aeson, project-m36 == 0.1
419− Other-Modules: TutorialD.Interpreter.Export.Base, TutorialD.Interpreter.Export.CSV, TutorialD.Interpreter.Import.BasicExamples, TutorialD.Interpreter.Import.CSV, TutorialD.Interpreter.InformationOperator, TutorialD.Interpreter.RODatabaseContextOperator, TutorialD.Interpreter.TransactionGraphOperator, ProjectM36.Client.Json, ProjectM36.Server.RemoteCallTypes.Json, ProjectM36.Server.WebSocket, TutorialD.Interpreter, TutorialD.Interpreter.Base, TutorialD.Interpreter.DatabaseContextExpr, TutorialD.Interpreter.Import.Base, TutorialD.Interpreter.Import.TutorialD, TutorialD.Interpreter.RelationalExpr, TutorialD.Interpreter.Types
457+ main-is: Relation/Atomable.hs
458+ Other-Modules: TutorialD.Interpreter, TutorialD.Interpreter.Base, TutorialD.Interpreter.DatabaseContextExpr, TutorialD.Interpreter.DatabaseContextIOOperator, TutorialD.Interpreter.Export.Base, TutorialD.Interpreter.Export.CSV, TutorialD.Interpreter.Import.Base, TutorialD.Interpreter.Import.BasicExamples, TutorialD.Interpreter.Import.CSV, TutorialD.Interpreter.Import.TutorialD, TutorialD.Interpreter.InformationOperator, TutorialD.Interpreter.RODatabaseContextOperator, TutorialD.Interpreter.RelationalExpr, TutorialD.Interpreter.SchemaOperator, TutorialD.Interpreter.TestBase, TutorialD.Interpreter.TransGraphRelationalOperator, TutorialD.Interpreter.TransactionGraphOperator, TutorialD.Interpreter.Types, TutorialD.Printer
459+
460+Test-Suite test-multiprocess-access
461+ import: commontest
462+ type: exitcode-stdio-1.0
463+ main-is: MultiProcessDatabaseAccess.hs
464+
465+Test-Suite test-transactiongraph-automerge
466+ import: commontest
467+ type: exitcode-stdio-1.0
468+ main-is: TransactionGraph/Automerge.hs
469+ Other-Modules: TutorialD.Interpreter, TutorialD.Interpreter.Base, TutorialD.Interpreter.DatabaseContextExpr, TutorialD.Interpreter.DatabaseContextIOOperator, TutorialD.Interpreter.Export.Base, TutorialD.Interpreter.Export.CSV, TutorialD.Interpreter.Import.Base, TutorialD.Interpreter.Import.BasicExamples, TutorialD.Interpreter.Import.CSV, TutorialD.Interpreter.Import.TutorialD, TutorialD.Interpreter.InformationOperator, TutorialD.Interpreter.RODatabaseContextOperator, TutorialD.Interpreter.RelationalExpr, TutorialD.Interpreter.SchemaOperator, TutorialD.Interpreter.TestBase, TutorialD.Interpreter.TransGraphRelationalOperator, TutorialD.Interpreter.TransactionGraphOperator, TutorialD.Interpreter.Types, TutorialD.Printer
470+
471+Test-Suite test-tupleable
472+ import: commontest
473+ type: exitcode-stdio-1.0
474+ main-is: Relation/Tupleable.hs
475+
476+Test-Suite test-client-simple
477+ import: commontest
478+ Main-Is: Client/Simple.hs
479+ type: exitcode-stdio-1.0
480+
481+-- test for file handle leaks
482+Executable handles
483+ Default-Language: Haskell2010
420484 Default-Extensions: OverloadedStrings
421− GHC-Options: -Wall
422− Hs-Source-Dirs: ./src/bin, .
423− CPP-Options: -DPROJECTM36_VERSION="v0.1"
485+ Build-Depends: base, HUnit, Cabal, containers, hashable, unordered-containers, mtl, vector, time, hashable-time, bytestring, uuid, stm, deepseq, deepseq-generics,parallel, cassava, attoparsec, gnuplot, directory, temporary, haskeline, megaparsec, text, base64-bytestring, data-interval, filepath, optparse-applicative, stm-containers, list-t, ghc, ghc-paths, transformers, project-m36, random, MonadRandom, semigroups, parser-combinators, prettyprinter, modern-uri, http-types, http-conduit, base16-bytestring, cryptohash-sha256
486+ main-is: benchmark/Handles.hs
487+ Other-Modules: TutorialD.Interpreter,
488+ TutorialD.Interpreter.Base,
489+ TutorialD.Interpreter.DatabaseContextExpr,
490+ TutorialD.Interpreter.DatabaseContextIOOperator,
491+ TutorialD.Interpreter.Export.Base,
492+ TutorialD.Interpreter.Export.CSV,
493+ TutorialD.Interpreter.Import.Base,
494+ TutorialD.Interpreter.Import.BasicExamples,
495+ TutorialD.Interpreter.Import.CSV,
496+ TutorialD.Interpreter.Import.TutorialD,
497+ TutorialD.Interpreter.InformationOperator,
498+ TutorialD.Interpreter.RODatabaseContextOperator,
499+ TutorialD.Interpreter.RelationalExpr,
500+ TutorialD.Interpreter.SchemaOperator,
501+ TutorialD.Interpreter.TransGraphRelationalOperator,
502+ TutorialD.Interpreter.TransactionGraphOperator,
503+ TutorialD.Interpreter.Types
504+ TutorialD.Printer
505+ GHC-Options: -Wall -threaded -rtsopts
506+ HS-Source-Dirs: ./src/bin
507+ if flag(profiler)
508+ GHC-Prof-Options: -fprof-auto -rtsopts -threaded -Wall
509+
510+Test-Suite test-dataframe
511+ import: commontest
512+ type: exitcode-stdio-1.0
513+ Main-Is: DataFrame.hs
514+ Other-Modules: TutorialD.Interpreter, TutorialD.Interpreter.Base, TutorialD.Interpreter.DatabaseContextExpr, TutorialD.Interpreter.DatabaseContextIOOperator, TutorialD.Interpreter.Export.Base, TutorialD.Interpreter.Export.CSV, TutorialD.Interpreter.Import.Base, TutorialD.Interpreter.Import.BasicExamples, TutorialD.Interpreter.Import.CSV, TutorialD.Interpreter.Import.TutorialD, TutorialD.Interpreter.InformationOperator, TutorialD.Interpreter.RODatabaseContextOperator, TutorialD.Interpreter.RelationalExpr, TutorialD.Interpreter.SchemaOperator, TutorialD.Interpreter.TestBase, TutorialD.Interpreter.TransGraphRelationalOperator, TutorialD.Interpreter.TransactionGraphOperator, TutorialD.Interpreter.Types, TutorialD.Printer
release.nixnew file+36
@@ -0,0 +1,36 @@
1+{ compiler ? "ghc8104"
2+, sources ? import ./nix/sources.nix
3+, pkgs ? import sources.nixpkgs { }
4+}:
5+let
6+ doJailbreak = pkgs.haskell.lib.doJailbreak;
7+ needsCocoa = drv:
8+ if pkgs.stdenv.isDarwin
9+ then drv.overrideDerivation (old:
10+ { buildInputs = [ pkgs.darwin.apple_sdk.frameworks.Cocoa ] ++ old.buildInputs; }
11+ )
12+ else drv;
13+
14+ haskellPackages = pkgs.haskell.packages.${compiler}.override {
15+ overrides = self: super: {
16+ curryer-rpc = self.callCabal2nix "curryer-rpc" sources.curryer { };
17+ streamly = doJailbreak (needsCocoa (self.callCabal2nix "streamly" sources.streamly { }));
18+ project-m36 = ((self.callCabal2nixWithOptions "project-m36" ./. "-f-haskell-scripting" { }));
19+ };
20+ };
21+in
22+{
23+ project = haskellPackages.project-m36;
24+
25+ shell = haskellPackages.shellFor {
26+ packages = p: [
27+ p.project-m36
28+ ];
29+ buildInputs = [
30+ haskellPackages.ghcid
31+ haskellPackages.hlint
32+ pkgs.docker
33+ ];
34+ withHoogle = true;
35+ };
36+}
runghcid.shnew file+2
@@ -0,0 +1,2 @@
1+#!/bin/sh
2+~/.cabal/bin/ghcid --command="cabal new-repl $1"
scripts/DateExamples.tutd+26−5
@@ -1,5 +1,26 @@
1−s := relation{tuple{s# "S1",sname "Smith",status 20, city "London"}, tuple{s# "S2",sname "Jones",status 10,city "Paris"}, tuple{s# "S3",sname "Blake",status 30,city "Paris"}, tuple{s# "S4",sname "Clark",status 20,city "London"}, tuple{s# "S5",sname "Adams",status 30,city "Athens"}}
2−p := relation{tuple{p# "P1",pname "Nut",color "Red",weight 12,city "London"}, tuple{p# "P2",pname "Bolt",color "Green",weight 17,city "Paris"}, tuple{p# "P3",pname "Screw",color "Blue",weight 17,city "Oslo"}, tuple{p# "P4",pname "Screw",color "Red",weight 14,city "London"}, tuple{p# "P5",pname "Cam",color "Blue",weight 12,city "Paris"}, tuple{p# "P6", pname "Cog", color "Red",weight 19,city "London"}}
3−sp := relation{tuple{s# "S1",p# "P1",qty 300}, tuple{s# "S1",p# "P2",qty 200}, tuple{s# "S1",p# "P3",qty 400}, tuple{s# "S1",p# "P4",qty 200}, tuple{s# "S1",p# "P5",qty 100}, tuple{s# "S1",p# "P6",qty 100}, tuple{s# "S2",p# "P1",qty 300}, tuple{s# "S2",p# "P2",qty 400}, tuple{s# "S3",p# "P2",qty 200}, tuple{s# "S4",p# "P4",qty 300}, tuple{s# "S4",p# "P5",qty 400}}
4−foreign key sp2s sp{s#} in s{s#}
5−foreign key sp2p sp{p#} in p{p#}
1+s := relation{tuple{s# "S1",sname "Smith",status 20, city "London"},
2+ tuple{s# "S2",sname "Jones",status 10,city "Paris"},
3+ tuple{s# "S3",sname "Blake",status 30,city "Paris"},
4+ tuple{s# "S4",sname "Clark",status 20,city "London"},
5+ tuple{s# "S5",sname "Adams",status 30,city "Athens"}};
6+p := relation{tuple{p# "P1",pname "Nut",color "Red",weight 12,city "London"},
7+ tuple{p# "P2",pname "Bolt",color "Green",weight 17,city "Paris"},
8+ tuple{p# "P3",pname "Screw",color "Blue",weight 17,city "Oslo"},
9+ tuple{p# "P4",pname "Screw",color "Red",weight 14,city "London"},
10+ tuple{p# "P5",pname "Cam",color "Blue",weight 12,city "Paris"},
11+ tuple{p# "P6", pname "Cog", color "Red",weight 19,city "London"}};
12+sp := relation{tuple{s# "S1",p# "P1",qty 300},
13+ tuple{s# "S1",p# "P2",qty 200},
14+ tuple{s# "S1",p# "P3",qty 400},
15+ tuple{s# "S1",p# "P4",qty 200},
16+ tuple{s# "S1",p# "P5",qty 100},
17+ tuple{s# "S1",p# "P6",qty 100},
18+ tuple{s# "S2",p# "P1",qty 300},
19+ tuple{s# "S2",p# "P2",qty 400},
20+ tuple{s# "S3",p# "P2",qty 200},
21+ tuple{s# "S4",p# "P4",qty 300},
22+ tuple{s# "S4",p# "P5",qty 400}};
23+key s_pkey {s#} s;
24+key p_key {p#} p;
25+foreign key s_sp_fk sp{s#} in s{s#};
26+foreign key p_sp_fk sp{p#} in p{p#};
scripts/multiline.tutdnew file+2
@@ -0,0 +1,2 @@
1+x:=relation{
2+tuple{ x 2}} -- nice
shell.nixnew file+1
@@ -0,0 +1 @@
1+(import ./release.nix { }).shell
src/bin/ProjectM36/Client/Json.hs+4−1
@@ -3,6 +3,7 @@ module ProjectM36.Client.Json where
33import Data.Aeson
44import ProjectM36.Server.RemoteCallTypes.Json ()
55import ProjectM36.Client
6+import ProjectM36.TransactionGraph
67import Control.Exception (IOException)
78
89instance ToJSON EvaluatedNotification
@@ -11,4 +12,6 @@ instance FromJSON EvaluatedNotification
1112instance ToJSON ConnectionError
1213
1314instance ToJSON IOException where
14− toJSON err = object ["IOException" .= show err]
15+ toJSON err = object ["IOException" .= show err]
16+
17+instance ToJSON MerkleValidationError
src/bin/ProjectM36/Server/RemoteCallTypes/Json.hs+84−33
@@ -1,17 +1,22 @@
11--create a bunch of orphan instances for use with the websocket server
2+{-# LANGUAGE FlexibleInstances #-}
23{-# OPTIONS_GHC -fno-warn-orphans #-}
34module ProjectM36.Server.RemoteCallTypes.Json where
4−import ProjectM36.Server.RemoteCallTypes
5+import ProjectM36.AtomFunctionError
56import ProjectM36.Base
6−import ProjectM36.ConcreteTypeRep
7−import ProjectM36.Error
7+import ProjectM36.DataFrame
8+import ProjectM36.DatabaseContextFunctionError
89import ProjectM36.DataTypes.Primitive
10+import ProjectM36.Error
11+import ProjectM36.IsomorphicSchema
12+import ProjectM36.Server.RemoteCallTypes
13+import ProjectM36.MerkleHash
14+import ProjectM36.Attribute as A
915
10−import Control.Monad
1116import Data.Aeson
12−import Data.UUID.Aeson ()
1317import Data.ByteString.Base64 as B64
1418import Data.Text.Encoding
19+import Data.Time.Calendar
1520
1621instance ToJSON RelationalExpr
1722instance FromJSON RelationalExpr
@@ -19,6 +24,9 @@ instance FromJSON RelationalExpr
1924instance ToJSON TupleExpr
2025instance FromJSON TupleExpr
2126
27+instance ToJSON TupleExprs
28+instance FromJSON TupleExprs
29+
2230instance ToJSON RestrictionPredicateExpr
2331instance FromJSON RestrictionPredicateExpr
2432
@@ -37,8 +45,11 @@ instance FromJSON ExecuteRelationalExpr
3745instance ToJSON Relation
3846instance FromJSON Relation
3947
40−instance ToJSON Attribute
41−instance FromJSON Attribute
48+instance ToJSON Attribute where
49+ toJSON (Attribute attrName aType) = object [ "name" .= attrName
50+ , "type" .= toJSON aType ]
51+instance FromJSON Attribute where
52+ parseJSON = withObject "Attribute" $ \v -> Attribute <$> v .: "name" <*> v .: "type"
4253
4354instance ToJSON ExtendTupleExpr
4455instance FromJSON ExtendTupleExpr
@@ -55,23 +66,27 @@ instance FromJSON AtomType
5566instance ToJSON TypeConstructor
5667instance FromJSON TypeConstructor
5768
58−instance ToJSON TypeConstructorArg
59−instance FromJSON TypeConstructorArg
69+instance ToJSON SchemaExpr
70+instance FromJSON SchemaExpr
6071
61−instance ToJSON SerialRep
62−instance FromJSON SerialRep
72+instance ToJSON SchemaIsomorph
73+instance FromJSON SchemaIsomorph
6374
64−instance FromJSON ConcreteTypeRep where
65− parseJSON = withObject "ctr" $ \o -> do
66− serialRep <- o .: "serialrep"
67− pure $ fromSerial serialRep
68−
69−instance ToJSON ConcreteTypeRep where
70− toJSON ctr = object [
71− "serialrep" .= toSerial ctr
72− ]
73−
74−instance ToJSON Atom where
75+instance ToJSON DataFrame
76+instance FromJSON DataFrame
77+
78+instance ToJSON DataFrameTuple
79+instance FromJSON DataFrameTuple
80+
81+instance ToJSON AttributeOrder
82+instance FromJSON AttributeOrder
83+
84+instance ToJSON Order
85+instance FromJSON Order
86+
87+instance ToJSON Atom where
88+ toJSON atom@(IntegerAtom i) = object [ "type" .= atomTypeForAtom atom,
89+ "val" .= i ]
7590 toJSON atom@(IntAtom i) = object [ "type" .= atomTypeForAtom atom,
7691 "val" .= i ]
7792 toJSON atom@(DoubleAtom i) = object [ "type" .= atomTypeForAtom atom,
@@ -79,7 +94,7 @@ instance ToJSON Atom where
7994 toJSON atom@(TextAtom i) = object [ "type" .= atomTypeForAtom atom,
8095 "val" .= i ]
8196 toJSON atom@(DayAtom i) = object [ "type" .= atomTypeForAtom atom,
82− "val" .= i ]
97+ "val" .= toGregorian i ]
8398 toJSON atom@(DateTimeAtom i) = object [ "type" .= atomTypeForAtom atom,
8499 "val" .= i ]
85100 toJSON atom@(ByteStringAtom i) = object [ "type" .= atomTypeForAtom atom,
@@ -88,47 +103,83 @@ instance ToJSON Atom where
88103 "val" .= i ]
89104 toJSON atom@(RelationAtom i) = object [ "type" .= atomTypeForAtom atom,
90105 "val" .= i ]
106+ toJSON atom@(RelationalExprAtom i) = object [ "type" .= atomTypeForAtom atom,
107+ "val" .= i ]
91108 toJSON (ConstructedAtom dConsName atomtype atomlist) = object [
92109 "dataconstructorname" .= dConsName,
93110 "type" .= toJSON atomtype,
94111 "atomlist" .= toJSON atomlist
95112 ]
96−
113+
97114instance FromJSON Atom where
98115 parseJSON = withObject "atom" $ \o -> do
99− atype <- o .: "type"
116+ atype <- o .: "type"
100117 case atype of
101− AnyAtomType -> fail "cannot pass AnyAtomType over the wire"
118+ TypeVariableType _ -> fail "cannot pass TypeVariableType over the wire"
102119 caType@(ConstructedAtomType _ _) -> ConstructedAtom <$> o .: "dataconstructorname" <*> pure caType <*> o .: "atom"
103− RelationAtomType _ -> do
104− rel <- o .: "val"
105− pure $ RelationAtom rel
120+ RelationAtomType _ -> RelationAtom <$> o .: "val"
106121 IntAtomType -> IntAtom <$> o .: "val"
122+ IntegerAtomType -> IntegerAtom <$> o .: "val"
107123 DoubleAtomType -> DoubleAtom <$> o .: "val"
108124 TextAtomType -> TextAtom <$> o .: "val"
109− DayAtomType -> DayAtom <$> o .: "val"
125+ DayAtomType -> do
126+ (y, m, d) <- o .: "val"
127+ pure (DayAtom (fromGregorian y m d))
110128 DateTimeAtomType -> DateTimeAtom <$> o .: "val"
111129 ByteStringAtomType -> do
112− b64bs <- liftM encodeUtf8 (o .: "val")
130+ b64bs <- fmap encodeUtf8 (o .: "val")
113131 case B64.decode b64bs of
114132 Left err -> fail ("Failed to parse base64-encoded ByteString: " ++ err)
115133 Right bs -> pure (ByteStringAtom bs)
116134 BoolAtomType -> BoolAtom <$> o .: "val"
135+ RelationalExprAtomType -> RelationalExprAtom <$> o .: "val"
117136
118137instance ToJSON Notification
119138instance FromJSON Notification
120139
121−instance ToJSON AtomFunctionBodyCompilationError
122−instance FromJSON AtomFunctionBodyCompilationError
140+instance ToJSON ScriptCompilationError
141+instance FromJSON ScriptCompilationError
142+
143+instance ToJSON MerkleHash where
144+ toJSON h = object [ "merklehash" .= decodeUtf8 (B64.encode (_unMerkleHash h))]
145+instance FromJSON MerkleHash where
146+ parseJSON = withObject "merklehash" $ \o -> do
147+ b64bs <- encodeUtf8 <$> o .: "merklehash"
148+ case B64.decode b64bs of
149+ Left err -> fail ("Failed to parse merkle hash: " ++ err)
150+ Right bs -> pure (MerkleHash bs)
151+
152+instance ToJSON Attributes where
153+ toJSON attrs = object ["attributes" .= map toJSON (A.toList attrs)]
154+instance FromJSON Attributes where
155+ parseJSON = withObject "Attributes" $ \o ->
156+ A.attributesFromList <$> o .: "attributes"
123157
124158instance ToJSON RelationalError
125159instance FromJSON RelationalError
126160
161+instance ToJSON SchemaError
162+instance FromJSON SchemaError
163+
127164instance ToJSON MergeError
128165instance FromJSON MergeError
129166
167+instance ToJSON ImportError'
168+instance FromJSON ImportError'
169+
170+instance ToJSON DatabaseContextFunctionError
171+instance FromJSON DatabaseContextFunctionError
172+
130173instance ToJSON MergeStrategy
131174instance FromJSON MergeStrategy
132175
133176instance ToJSON PersistenceError
177+instance FromJSON PersistenceError
178+
179+instance ToJSON AtomFunctionError
180+instance FromJSON AtomFunctionError
181+
182+instance ToJSON WithNameExpr
183+instance FromJSON WithNameExpr
184+
134185
src/bin/ProjectM36/Server/WebSocket.hs+112−39
@@ -1,3 +1,4 @@
1+{-# LANGUAGE LambdaCase, CPP #-}
12module ProjectM36.Server.WebSocket where
23-- while the tutd client performs TutorialD parsing on the client, the websocket server will pass tutd to be parsed and executed on the server- otherwise I have to pull in ghcjs as a dependency to allow client-side parsing- that's not appealing because then the frontend is not language-agnostic, but this could change in the future, perhaps by sending different messages over the websocket
34-- ideally, the wire protocol should not be exposed to a straight string-based API ala SQL, so we could make perhaps a javascript DSL which compiles to the necessary JSON- anaylyze tradeoffs
@@ -9,65 +10,137 @@ import qualified Data.Text as T
910import qualified Network.WebSockets as WS
1011import ProjectM36.Server.RemoteCallTypes.Json ()
1112import ProjectM36.Client.Json ()
13+import ProjectM36.DataFrame
14+import ProjectM36.Relation.Show.Term
15+import ProjectM36.Relation.Show.HTML
1216import Data.Aeson
1317import TutorialD.Interpreter
14−import TutorialD.Interpreter.Base
18+import TutorialD.Interpreter.Base (TutorialDOperatorResult(..))
1519import ProjectM36.Client
1620import Control.Exception
21+import Data.Attoparsec.Text
22+import Control.Applicative
23+import Text.Megaparsec.Error
24+import Data.Functor
25+import Data.Either (fromRight)
1726
18−-- | Called when the project-m36-server exits.
19−failureHandler :: Either SomeException Bool -> IO ()
20−failureHandler = error "project-m36-server exited unexpectedly"
27+#if MIN_VERSION_megaparsec(7,0,0)
28+import Data.List.NonEmpty as NE
29+#endif
2130
2231websocketProxyServer :: Port -> Hostname -> WS.ServerApp
23−websocketProxyServer port host pending = do
32+websocketProxyServer port host pending = do
2433 conn <- WS.acceptRequest pending
2534 let unexpectedMsg = WS.sendTextData conn ("messagenotexpected" :: T.Text)
2635 --phase 1- accept database name for connection
27− dbmsg <- (WS.receiveData conn) :: IO T.Text
36+ dbmsg <- WS.receiveData conn :: IO T.Text
2837 let connectdbmsg = "connectdb:"
2938 if not (connectdbmsg `T.isPrefixOf` dbmsg) then unexpectedMsg >> WS.sendClose conn ("" :: T.Text)
3039 else do
31− let dbname = T.unpack $ T.drop (T.length connectdbmsg) dbmsg
32− eDbconn <- createConnection conn dbname port host
33− case eDbconn of
34− Left err -> sendError conn err
35− Right dbconn -> do
36− eSessionId <- createSessionAtHead "master" dbconn
37− case eSessionId of
40+ let dbname = T.unpack $ T.drop (T.length connectdbmsg) dbmsg
41+ bracket (createConnection conn dbname port host)
42+ (\case
43+ Right dbconn -> close dbconn
44+ Left _ -> pure ()) $ \case
3845 Left err -> sendError conn err
39− Right sessionId -> do
40− --phase 2- accept tutoriald commands
41− _ <- forever $ do
42− msg <- (WS.receiveData conn) :: IO T.Text
43− let tutdprefix = "executetutd:"
44− case msg of
45− _ | tutdprefix `T.isPrefixOf` msg -> do
46− let tutdString = T.drop (T.length tutdprefix) msg
47− case parseTutorialD (T.unpack tutdString) of
48− Left err -> handleOpResult conn dbconn (DisplayErrorResult ("parse error: " `T.append` T.pack (show err)))
49− Right parsed -> do
50− result <- evalTutorialD sessionId dbconn SafeEvaluation parsed
51− handleOpResult conn dbconn result
52− _ -> unexpectedMsg
53− pure ()
54−
55−notificationCallback :: WS.Connection -> NotificationCallback
46+ Right dbconn -> do
47+ eSessionId <- createSessionAtHead dbconn "master"
48+ case eSessionId of
49+ Left err -> sendError conn err
50+ Right sessionId -> do
51+ --phase 2- accept tutoriald commands
52+ _ <- forever $ do
53+ pInfo <- promptInfo sessionId dbconn
54+ --figure out why sending three times during startup is necessary
55+ sendPromptInfo pInfo conn
56+ sendPromptInfo pInfo conn
57+ msg <- WS.receiveData conn :: IO T.Text
58+ case parseOnly parseExecuteMessage msg of
59+ Left _ -> unexpectedMsg
60+ Right (presentation, tutdString) ->
61+ case parseTutorialD tutdString of
62+ Left err -> handleOpResult conn dbconn presentation
63+#if MIN_VERSION_megaparsec(7,0,0)
64+ (DisplayErrorResult
65+ ("parse error: " `T.append` T.pack
66+ (parseErrorPretty . NE.head . bundleErrors $ err)))
67+#else
68+ (DisplayErrorResult ("parse error: " `T.append` T.pack (parseErrorPretty err)))
69+#endif
70+ Right parsed -> do
71+ let timeoutFilter exc = if exc == RequestTimeoutException
72+ then Just exc
73+ else Nothing
74+ responseHandler = do
75+ result <- evalTutorialD sessionId dbconn SafeEvaluation parsed
76+ pInfo' <- promptInfo sessionId dbconn
77+ sendPromptInfo pInfo' conn
78+ handleOpResult conn dbconn presentation result
79+ catchJust timeoutFilter responseHandler (\_ -> handleOpResult conn dbconn presentation (DisplayErrorResult "Request Timed Out."))
80+ pure ()
81+
82+notificationCallback :: WS.Connection -> NotificationCallback
5683notificationCallback conn notifName evaldNotif = WS.sendTextData conn (encode (object ["notificationname" .= notifName,
5784 "evaldnotification" .= evaldNotif
5885 ]))
59−
86+
6087--this creates a new database for each connection- perhaps not what we want (?)
6188createConnection :: WS.Connection -> DatabaseName -> Port -> Hostname -> IO (Either ConnectionError Connection)
62−createConnection wsconn dbname port host = connectProjectM36 (RemoteProcessConnectionInfo dbname (createNodeId host port) (notificationCallback wsconn))
89+createConnection wsconn dbname port host = connectProjectM36 (RemoteConnectionInfo dbname host (show port) (notificationCallback wsconn))
6390
6491sendError :: (ToJSON a) => WS.Connection -> a -> IO ()
6592sendError conn err = WS.sendTextData conn (encode (object ["displayerror" .= err]))
6693
67−handleOpResult :: WS.Connection -> Connection -> TutorialDOperatorResult -> IO ()
68−handleOpResult conn db QuitResult = WS.sendClose conn ("close" :: T.Text) >> close db
69−handleOpResult conn _ (DisplayResult out) = WS.sendTextData conn (encode (object ["display" .= out]))
70−handleOpResult _ _ (DisplayIOResult ioout) = ioout
71−handleOpResult conn _ (DisplayErrorResult err) = WS.sendTextData conn (encode (object ["displayerror" .= err]))
72−handleOpResult conn _ QuietSuccessResult = WS.sendTextData conn (encode (object ["acknowledged" .= True]))
73−handleOpResult conn _ (DisplayRelationResult rel) = WS.sendTextData conn (encode (object ["displayrelation" .= rel]))
94+handleOpResult :: WS.Connection -> Connection -> Presentation -> TutorialDOperatorResult -> IO ()
95+handleOpResult conn db _ QuitResult = WS.sendClose conn ("close" :: T.Text) >> close db
96+handleOpResult conn _ _ (DisplayResult out) = WS.sendTextData conn (encode (object ["display" .= out]))
97+handleOpResult _ _ _ (DisplayIOResult ioout) = ioout
98+handleOpResult conn _ presentation (DisplayErrorResult err) = do
99+ let jsono = ["json" .= err | jsonPresentation presentation]
100+ texto = ["text" .= err | textPresentation presentation]
101+ htmlo = ["html" .= err | htmlPresentation presentation]
102+ WS.sendTextData conn (encode (object ["displayerror" .= object (jsono ++ texto ++ htmlo)]))
103+handleOpResult conn _ _ (DisplayParseErrorResult _ err) = WS.sendTextData conn (encode (object ["displayparseerrorresult" .= show err]))
104+handleOpResult conn _ _ QuietSuccessResult = WS.sendTextData conn (encode (object ["acknowledged" .= True]))
105+handleOpResult conn _ presentation (DisplayRelationResult rel) = do
106+ let jsono = ["json" .= rel | jsonPresentation presentation]
107+ texto = ["text" .= showRelation rel | textPresentation presentation]
108+ htmlo = ["html" .= relationAsHTML rel | htmlPresentation presentation]
109+ WS.sendTextData conn (encode (object ["displayrelation" .= object (jsono ++ texto ++ htmlo)]))
110+handleOpResult conn _ presentation (DisplayDataFrameResult df) = do
111+ let jsono = ["json" .= df | jsonPresentation presentation]
112+ texto = ["text" .= showDataFrame df | textPresentation presentation]
113+ htmlo = ["html" .= dataFrameAsHTML df | htmlPresentation presentation]
114+ WS.sendTextData conn (encode (object ["displaydataframe" .= object (jsono ++ texto ++ htmlo)]))
115+
116+-- get current schema and head name for client
117+promptInfo :: SessionId -> Connection -> IO (HeadName, SchemaName)
118+promptInfo sessionId conn = do
119+ eHeadName <- headName sessionId conn
120+ eSchemaName <- currentSchemaName sessionId conn
121+ pure (fromRight "<unknown>" eHeadName, fromRight "<no schema>" eSchemaName)
122+
123+sendPromptInfo :: (HeadName, SchemaName) -> WS.Connection -> IO ()
124+sendPromptInfo (hName, sName) conn = WS.sendTextData conn (encode (object ["promptInfo" .= object ["headname" .= hName, "schemaname" .= sName]]))
125+
126+--a returning relation can be returned as JSON, Text (for consoles), or HTML
127+data Presentation = Presentation {
128+ jsonPresentation :: Bool,
129+ textPresentation :: Bool,
130+ htmlPresentation :: Bool }
131+
132+data PresentationFlag = JSONFlag | TextFlag | HTMLFlag
133+
134+parseExecuteMessage :: Parser (Presentation, T.Text)
135+parseExecuteMessage = do
136+ _ <- string "executetutd/"
137+ flags <- sepBy ((string "json" $> JSONFlag) <|>
138+ (string "text" $> TextFlag) <|>
139+ (string "html" $> HTMLFlag)) "+"
140+ let presentation = foldr (\flag acc -> case flag of
141+ JSONFlag -> acc {jsonPresentation = True}
142+ TextFlag -> acc {textPresentation = True}
143+ HTMLFlag -> acc {htmlPresentation = True}) (Presentation False False False) flags
144+ _ <- char ':'
145+ tutd <- T.pack <$> manyTill anyChar endOfInput
146+ pure (presentation, tutd)
src/bin/ProjectM36/Server/WebSocket/project-m36.js+105−13
@@ -1,9 +1,31 @@
1−var ProjectM36Connection = function (host, port, dbname, openCallback, errorCallback, statusCallback, closeCallback) {
2− this.host = host
3− this.port = port
4− this.dbname = dbname
5− var connectURL = "ws://" + host + ":" + port + "/";
6− var socket = new WebSocket("ws://localhost:8888/");
1+/**
2+* Returns a connection to a Project:M36 database. The connection created relies on websockets and should therefore function from any modern web browser or node server. This API is asynchronous and callback-based.
3+* @param {string} protocol - Choose from "ws://" and "wss://". "wss" is the SSL-wrapped websockets protocol and should therefore be preferred.
4+* @param {string} host - The IP address or name of the host of the database.
5+* @param {string} path - The websocket path where the websocket server is bound. Unless the project-m36-websocket-server is proxied, this is ignored by the server.
6+* @param {string} dbname - The name of the remote database.
7+* @param {openCallback} openCallback - A function to call when the connection is successfully open and ready for queries.
8+* @param {errorCallback} errorCallback - A function called if the connection process encounters an error. This is not called for errors in the queries.
9+* @param {statusCallback} statusCallback - A function called with synchronous and asynchronous status updates such as query errors and query results.
10+* @param {promptCallback} promptCallback - A function called whenever prompt information such as the current schema name and current branch name (if any).
11+* @param {closeCallback} closeCallback - A function called once the connection is closed.
12+*/
13+var ProjectM36Connection = function (protocol, host, port, path, dbname, openCallback, errorCallback, statusCallback, promptCallback, notificationCallback, closeCallback) {
14+ this.protocol = protocol;
15+ this.host = host;
16+ this.port = port;
17+ this.path = path;
18+ this.dbname = dbname;
19+ var connectURL = protocol + '://' + host;
20+ if(port)
21+ {
22+ connectURL = connectURL + ":" + port;
23+ }
24+ if(path)
25+ {
26+ connectURL = connectURL + "/" + path;
27+ }
28+ var socket = new WebSocket(connectURL);
729 var self = this;
830 socket.onopen = function(event) {
931 self.socket.send("connectdb:" + self.dbname);
@@ -21,12 +43,22 @@ var ProjectM36Connection = function (host, port, dbname, openCallback, errorCall
2143 closeCallback(event);
2244 };
2345 this.statuscallback = statusCallback;
46+ this.promptcallback = promptCallback;
47+ this.notificationcallback = notificationCallback;
2448 this.socket = socket;
2549}
2650
27−var ProjectM36Status = function (relationResult, acknowledgementResult, errorResult)
51+/**
52+* The argument returned as part of the 'statusCallback'. Typically, only one of the three status types is populated. These status updates are groups together so that the callback can feed into a user interface update function.
53+* @callback statusCallback
54+* @param {Object} relationResult - The status update containing a relation or null.
55+* @param {Object} acknowledgementresult - The status update containing an acknowledgement that the query was executed or null.
56+* @param {Object} errorResult - The status update containing the error information or null.
57+*/
58+var ProjectM36Status = function (relationResult, dataFrameResult, acknowledgementResult, errorResult)
2859{
2960 this.relation = relationResult;
61+ this.dataframe = dataFrameResult;
3062 this.acknowledgement = acknowledgementResult;
3163 this.error = errorResult;
3264}
@@ -44,16 +76,25 @@ ProjectM36Connection.prototype.readyState = function()
4476ProjectM36Connection.prototype.handleResponse = function(message)
4577{
4678 var relation = message["displayrelation"];
79+ var dataframe = message["displaydataframe"];
4780 var acknowledged = message["acknowledged"];
4881 var error = message["displayerror"];
82+ var prompt = message["promptInfo"];
83+ var notification = message["notificationname"]
84+
4985 if(relation)
5086 {
51− this.statuscallback(new ProjectM36Status(relation, null, null));
87+ this.statuscallback(new ProjectM36Status(relation['json'], null, null, null));
88+ }
89+
90+ if(dataframe)
91+ {
92+ this.statuscallback(new ProjectM36Status(null, dataframe['json'], null, null));
5293 }
5394
5495 if(acknowledged)
5596 {
56− this.statuscallback(new ProjectM36Status(null, true, null));
97+ this.statuscallback(new ProjectM36Status(null, null, true, null));
5798 }
5899
59100 if(error)
@@ -62,15 +103,34 @@ ProjectM36Connection.prototype.handleResponse = function(message)
62103 {
63104 error=error.tag; // for error objects
64105 }
65− this.statuscallback(new ProjectM36Status(null, null, error));
106+ this.statuscallback(new ProjectM36Status(null, null, null, error['json']));
107+ }
108+
109+ if(prompt)
110+ {
111+ this.promptcallback(prompt["headname"], prompt["schemaname"]);
112+ }
113+
114+ if(notification)
115+ {
116+ var evaldnotif = message.evaldnotification;
117+ this.notificationcallback(message.notificationname, evaldnotif);
66118 }
67119}
68120
121+/**
122+* Executes a TutorialD string.
123+* @param {string} tutd - The TutorialD string.
124+*/
69125ProjectM36Connection.prototype.executeTutorialD = function(tutd)
70126{
71− this.socket.send("executetutd:" + tutd);
127+ this.socket.send("executetutd/json:" + tutd);
72128}
73129
130+/**
131+* A utitily function which creates and returns a table element representing the relation.
132+* @param {object} - The relation returned from executing a relational expression.
133+*/
74134ProjectM36Connection.prototype.generateRelation = function(relation)
75135{
76136 var table = document.createElement("table");
@@ -108,6 +168,7 @@ ProjectM36Connection.prototype.generateAtomType = function(attr)
108168{
109169 var atomType = attr[1]["tag"];
110170 var attrName = attr[0];
171+ var accessory = attr[2];
111172 var element = document.createElement("span");
112173 element.textContent = attrName + "::";
113174 if (atomType == "RelationAtomType")
@@ -132,7 +193,11 @@ ProjectM36Connection.prototype.generateAtomType = function(attr)
132193 var readableType = atomType.slice(0,-8);
133194 element.textContent += readableType;
134195 }
135− return element
196+ if(accessory)
197+ {
198+ element.textContent += accessory;
199+ }
200+ return element;
136201}
137202
138203ProjectM36Connection.prototype.generateRelationBody = function (body)
@@ -177,6 +242,33 @@ ProjectM36Connection.prototype.generateAtom = function(atom)
177242 return element;
178243}
179244
245+ProjectM36Connection.prototype.generateDataFrame = function(dataframe)
246+{
247+ for(var attrIndex=0; attrIndex < dataframe.attributes.length; attrIndex++)
248+ {
249+ var attr = dataframe.attributes[attrIndex];
250+ var ordering = "↕";
251+ for(var orderIndex=0; orderIndex < dataframe.orders.length; orderIndex++)
252+ {
253+ var order = dataframe.orders[orderIndex];
254+ if(order[0] == attr[0])
255+ {
256+ if(order[1] == "AscendingOrder")
257+ {
258+ ordering = "⬆";
259+ }
260+ else if(order[1] == "DescendingOrder")
261+ {
262+ ordering = "⬇";
263+ }
264+ }
265+ }
266+ dataframe.attributes[attrIndex].push(ordering);
267+ }
268+ return this.generateRelation([dataframe.attributes,
269+ {asList:dataframe.tuples}]);
270+}
271+
180272//special case to make sure that a table appears for "true" and "false"
181273function mungeEmptyRows()
182274{
@@ -196,4 +288,4 @@ function mungeEmptyRows()
196288 empty.appendChild(dudHeader);
197289 }
198290 }
199−}
291+}
src/bin/ProjectM36/Server/WebSocket/websocket-client.html+48−17
@@ -5,6 +5,7 @@
55<title>Project:M36 WebSocket Client</title>
66<script type="text/javascript" src="project-m36.js"></script>
77<script type="text/javascript" src="websocket-client.js"></script>
8+<script type="text/javascript" src="websocket-config.js"></script>
89<style>
910#sectiontemplate
1011{
@@ -13,7 +14,6 @@
1314
1415.deletesection
1516{
16− float:right;
1717 border: 1px solid;
1818 padding: 3px;
1919 border-radius: 3px;
@@ -29,6 +29,7 @@ background-image: linear-gradient(to right, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.75
2929
3030.title
3131{
32+font-family: Courier;
3233padding: 3pt;
3334border: 1px solid;
3435border-radius: 3px;
@@ -36,6 +37,11 @@ background-image: linear-gradient(to top, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.1),
3637margin: 3px;
3738}
3839
40+.titlesection
41+{
42+margin-bottom: 5pt;
43+}
44+
3945.result table
4046{
4147 border-collapse: collapse;
@@ -54,14 +60,19 @@ margin: 3px;
5460 background-image: linear-gradient(to top, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0));
5561}
5662
63+#connection #port
64+{
65+ width: 50pt;
66+}
67+
5768#connection input
5869{
59− width: 100px;
70+ width: 100pt;
6071}
6172
62−#samples
73+#samples li
6374{
64− display:none;
75+ font-family: Courier;
6576}
6677
6778#samplesouter
@@ -77,22 +88,45 @@ margin: 3px;
7788 background-color: #d1d1e0;
7889}
7990
91+#tutd
92+{
93+ width: 300pt;
94+ height: 50pt;
95+}
96+
8097</style>
8198</head>
82−<body onload="installSampleHandlers();">
83−<h1>Project:M36 WebSocket Client</h1>
99+<body onload="pageload();">
100+<h1><a href="https://github.com/agentm/project-m36">Project:M36</a> WebSocket Client</h1>
101+<p>This page will allow you to try TutorialD straight from your browser. Try some of the sample queries below.</p>
84102<div id="sheet">
85103 <div id="interactor">
86104 <form onsubmit="return connectOrDisconnect(this);" id="connection">
87− <label>Connection:</label><input type="text" name="host" value="localhost" placeholder="Host"/>:<input type="number" placeholder="Port" name="port" min="0" max="32767" value="8888"/>/<input type="text" placeholder="Database Name" name="dbname" value="test"/><input type="submit" name="connect" value="Connect"/>
105+ <span id="conninfo">Connect to: </span>
106+ <select name="protocol">
107+ <option value="wss" selected="selected">wss://</option>
108+ <option value="ws">ws://</option>
109+ </select>
110+ <input type="text" name="host" value="localhost" placeholder="Host"/>:
111+ <input id="port" type="number" placeholder="Port" name="port" min="0" max="65535" value="8888"/>/
112+ <input type="text" name="path" placeholder="path" value=""/>
113+ <label>database:</label><input type="text" placeholder="Database Name" name="dbname" value="test"/>
114+ <input type="submit" name="connect" value="Connect"/>
115+ </form>
116+ <form onsubmit="return execTutorialD();">
117+ <textarea id="tutd" placeholder="Enter a TutorialD query here."></textarea>
118+ <br/>
119+ <label id="promptinfo"></label>
120+ <input type="submit" id="eval" value="Evaluate TutorialD" disabled="disabled"/>
88121 </form>
89− <div onmouseover="toggleSamples(this, true);" onmouseleave="toggleSamples(this, false);" id="samplesouter">
90− <span>Sample TutorialD: <a href="https://github.com/agentm/project-m36/blob/master/docs/15_minute_tutorial.markdown">15 minute TutorialD Tutorial</a>.</span>
122+ <div id="samplesouter">
123+ <span>Try our <a href="https://github.com/agentm/project-m36/blob/master/docs/15_minute_tutorial.markdown">15 minute TutorialD Tutorial</a> or click these sample queries below:</span>
91124</span>
92125 <ul id="samples">
126+ <li>:showrelvars</li>
93127 <li>:showexpr true</li>
94128 <li>:showexpr false</li>
95− <li>:importexample date</li>
129+ <li>:importexample cjdate</li>
96130 <li>:showexpr s join sp</li>
97131 <li>update s where city=&quot;Paris&quot; (status:=10)</li>
98132 <li>:showexpr s</li>
@@ -100,15 +134,12 @@ margin: 3px;
100134 <li>:showgraph</li>
101135 </ul>
102136 </div>
103− <form onsubmit="return execTutorialD();">
104− <input type="text" id="tutd"/>
105− <input type="submit"/>
106− </form>
107137 </div>
108138 <div id="sectiontemplate">
109− <span class="title"></span>
110− <span class="deletesection" onclick="return hideParent(this);">X</span>
111− <div style="clear: both;"></div>
139+ <div class="titlesection">
140+ <span class="deletesection" onclick="return hideResult(this);">-</span>
141+ <span class="title"></span>
142+ </div>
112143 <div class="result">
113144 </div>
114145 <span class="relinfo"></span>
src/bin/ProjectM36/Server/WebSocket/websocket-client.js+124−19
@@ -30,6 +30,12 @@ function updateStatus(status)
3030 appendResult(tutd, relastable);
3131 mungeEmptyRows();
3232 }
33+ if(status.dataframe)
34+ {
35+ var dataframeastable = conn.generateDataFrame(status.dataframe);
36+ appendResult(tutd, dataframeastable);
37+ mungeEmptyRows();
38+ }
3339 if(status.acknowledgement)
3440 {
3541 var ok = document.createElement("span");
@@ -44,28 +50,87 @@ function updateStatus(status)
4450 }
4551}
4652
53+function promptUpdate(headName, schemaName)
54+{
55+ document.getElementById("promptinfo").textContent = "Current Branch: (" + headName + ") Schema: (" + schemaName + ")";
56+}
57+
58+function relationErrorAsString(errObj)
59+{
60+ return errObj.tag + " " + errObj.contents;
61+}
62+
63+function notificationUpdate(notificationName, evaldNotif)
64+{
65+ //generate two tables for display
66+ var notifDiv = document.createElement('div');
67+ var oldInfo = document.createElement('div');
68+ oldInfo.textContent = "Pre-change info: ";
69+ var newInfo = document.createElement('div');
70+ newInfo.textContent = "Post-change info: ";
71+ var status = "Notification received: " + notificationName;
72+
73+ if(evaldNotif.reportOldRelation.Left)
74+ {
75+ var errOld = evaldNotif.reportOldRelation.Left;
76+ oldInfo.textContent += relationErrorAsString(errOld);
77+ }
78+ else if(evaldNotif.reportOldRelation.Right)
79+ {
80+ oldInfo.appendChild(conn.generateRelation(evaldNotif.reportOldRelation.Right));
81+ }
82+
83+ if(evaldNotif.reportNewRelation.Left)
84+ {
85+ var errNew = evaldNotif.reportNewRelation.Left;
86+ newInfo.textContent += relationErrorAsString(errNew);
87+ }
88+ else if(evaldNotif.reportNewRelation.Right)
89+ {
90+ newInfo.appendChild(conn.generateRelation(evaldNotif.reportNewRelation.Right));
91+ }
92+
93+ notifDiv.appendChild(oldInfo);
94+ notifDiv.appendChild(document.createElement('br'));
95+ notifDiv.appendChild(newInfo);
96+ appendResult(status,notifDiv);
97+ mungeEmptyRows();
98+}
99+
47100var conn;
48101
49102function connectOrDisconnect(form)
50103{
51104 var formin = form.elements;
105+ var protocol = formin["protocol"].value;
52106 var host = formin["host"].value;
53107 var port = formin["port"].value;
108+ var path = formin["path"].value;
54109 var dbname = formin["dbname"].value;
110+
111+ var conninfo = document.getElementById("conninfo");
112+ var promptInfo = document.getElementById("promptinfo");
55113
56114 if(window.conn && window.conn.readyState() == 1)
57115 {
58116 //disconnect
59117 window.conn.close();
118+ conninfo.textContent = "Connect to:";
119+
60120 toggleConnectionFields(form, true, "Connect");
121+ promptInfo.textContent = "";
61122 }
62123 else
63124 {
64125 //connect
65− window.conn = new ProjectM36Connection(host, port, dbname,
126+ conninfo.textContent = "Connected to:";
127+ window.conn = new ProjectM36Connection(protocol, host, port, path,
128+ dbname,
66129 connectionOpened,
67130 connectionError,
68131 updateStatus,
132+ promptUpdate,
133+ notificationUpdate,
69134 connectionClosed);
70135 toggleConnectionFields(form, false, "Connecting...");
71136 }
@@ -88,7 +153,14 @@ function connectionClosed(event)
88153function toggleConnectionFields(form, enabled, status)
89154{
90155 form.elements["connect"].value = status;
91− var readonlyElements = [form.elements["host"], form.elements["port"], form.elements["dbname"]];
156+ var readonlyElements = [form.elements["host"],
157+ form.elements["port"],
158+ form.elements["dbname"],
159+ form.elements["path"]];
160+ var disableElements = [form.elements["protocol"],
161+ ]
162+ var enableElements = [document.getElementById("eval")];
163+
92164 for(var ein=0; ein < readonlyElements.length; ein++)
93165 {
94166 var e = readonlyElements[ein];
@@ -101,6 +173,37 @@ function toggleConnectionFields(form, enabled, status)
101173 e.setAttribute("readonly", "readonly");
102174 }
103175 }
176+ //also update the eval/submit button
177+ for(var ein=0; ein < disableElements.length; ein++)
178+ {
179+ var e = disableElements[ein];
180+ if(enabled)
181+ {
182+ e.removeAttribute("disabled");
183+ }
184+ else
185+ {
186+ e.setAttribute("disabled", "disabled");
187+
188+ }
189+ }
190+
191+ for(var ein=0; ein < enableElements.length; ein++)
192+ {
193+ var e = enableElements[ein];
194+ if(!enabled)
195+ {
196+ e.removeAttribute("disabled");
197+ }
198+ else
199+ {
200+ e.setAttribute("disabled", "disabled");
201+
202+ }
203+ }
204+
205+
206+
104207}
105208
106209function connectionOpened(event)
@@ -124,23 +227,10 @@ function execTutorialD()
124227 return false;
125228}
126229
127−function hideParent(element)
230+function hideResult(element)
128231{
129− var deleteNode = element.parentNode;
130− element.parentNode.parentNode.removeChild(deleteNode)
131−}
132−
133−function toggleSamples(element,show)
134−{
135− var samples = document.getElementById("samples");
136− if(show)
137− {
138− samples.style.display = "block";
139− }
140− else
141− {
142− samples.style.display = "none";
143− }
232+ var deleteNode = element.parentNode.parentNode;
233+ element.parentNode.parentNode.parentNode.removeChild(deleteNode)
144234}
145235
146236function installSampleHandlers()
@@ -154,4 +244,19 @@ function installSampleHandlers()
154244 tutd.value = el.target.textContent;
155245 }
156246 }
157−}
247+}
248+
249+function setupDefaultConfig()
250+{
251+ var form = document.getElementById("connection");
252+ for(var key in defaultConfig)
253+ {
254+ form.elements[key].value = defaultConfig[key];
255+ }
256+}
257+
258+function pageload()
259+{
260+ installSampleHandlers();
261+ setupDefaultConfig();
262+}
src/bin/ProjectM36/Server/WebSocket/websocket-config.jsnew file+5
@@ -0,0 +1,5 @@
1+var defaultConfig = { 'protocol': 'wss',
2+ 'host': 'try.project-m36.io',
3+ 'port': '',
4+ 'path': 'ws/',
5+ 'dbname': 'test' }
src/bin/ProjectM36/Server/WebSocket/websocket-server.hs+55−11
@@ -1,19 +1,63 @@
1−import ProjectM36.Server.WebSocket
1+{-# LANGUAGE CPP #-}
2+
3+import Control.Concurrent
4+import Control.Exception
5+import Control.Monad (when)
6+import Data.Maybe (isJust)
7+import Data.String (fromString)
8+import Network.HTTP.Types (status400)
9+import Network.Socket
10+import Network.Wai (Application, responseLBS)
11+import Network.Wai.Handler.Warp
12+import Network.Wai.Handler.WarpTLS (runTLS, tlsSettings)
13+import qualified Network.Wai.Handler.WebSockets as WS
14+import Network.WebSockets (defaultConnectionOptions)
15+import ProjectM36.Server
216import ProjectM36.Server.Config
317import ProjectM36.Server.ParseArgs
4−import ProjectM36.Server
5−import Control.Concurrent
6−import qualified Network.WebSockets as WS
18+import ProjectM36.Server.WebSocket
719
820main :: IO ()
921main = do
1022 -- launch normal project-m36-server
11− portMVar <- newEmptyMVar
12− serverConfig <- parseConfig
13− let serverHost = bindHost serverConfig
14− _ <- forkFinally (launchServer serverConfig (Just portMVar)) failureHandler
23+ addressMVar <- newEmptyMVar
24+ wsConfig <- parseWSConfigWithDefaults (defaultServerConfig {bindPort = 8000, bindHost = "127.0.0.1"})
25+
26+ --usurp the serverConfig for our websocket server and make the proxied server run locally
27+ let serverConfig = wsServerConfig wsConfig
28+ wsHost = bindHost serverConfig
29+ wsPort = bindPort serverConfig
30+ serverHost = "127.0.0.1"
31+ serverConfig' = serverConfig {bindPort = 0, bindHost = serverHost}
32+ configCertificateFile = tlsCertificatePath wsConfig
33+ configKeyFile = tlsKeyPath wsConfig
34+
35+ when (isJust configCertificateFile /= isJust configKeyFile) $
36+ throwIO $ ErrorCall "TLS_CERTIFICATE_PATH and TLS_KEY_PATH must be set in tandem"
37+
38+ _ <- forkFinally (launchServer serverConfig' (Just addressMVar) >> pure ()) (either throwIO pure)
1539 --wait for server to be listening
16− serverPort <- takeMVar portMVar
17− --this built-in server is apparently not meant for production use, but it's easier to test than starting up the wai or snap interfaces
18− WS.runServer "0.0.0.0" 8888 (websocketProxyServer serverPort serverHost)
40+ addr <- takeMVar addressMVar
41+ let port =
42+ case addr of
43+ SockAddrInet port' _ -> fromIntegral port'
44+ _ -> error "unsupported socket address (IPv4 only currently)"
45+ wsApp = websocketProxyServer port serverHost
46+ waiApp = WS.websocketsOr defaultConnectionOptions wsApp backupApp
47+ settings = warpSettings wsHost (fromIntegral wsPort)
48+
49+ case (configCertificateFile, configKeyFile) of
50+ (Just certificate, Just key) -> runTLS (tlsSettings certificate key) settings waiApp
51+ _ -> runSettings settings waiApp
52+
53+backupApp :: Application
54+backupApp _ respond = respond $ responseLBS status400 [] "Not a WebSocket request"
1955
56+warpSettings :: HostName -> Port -> Settings
57+warpSettings host port =
58+ setHost (fromString host)
59+ . setPort port
60+ . setServerName "project-m36"
61+ . setTimeout 3600
62+ . setGracefulShutdownTimeout (Just 5)
63+ $ defaultSettings
src/bin/TutorialD/Interpreter.hs+156−80
@@ -1,4 +1,4 @@
1−{-# LANGUAGE GADTs #-}
1+{-# LANGUAGE GADTs, LambdaCase, CPP #-}
22module TutorialD.Interpreter where
33import TutorialD.Interpreter.Base
44import TutorialD.Interpreter.RODatabaseContextOperator
@@ -6,6 +6,8 @@ import TutorialD.Interpreter.DatabaseContextExpr
66import TutorialD.Interpreter.TransactionGraphOperator
77import TutorialD.Interpreter.InformationOperator
88import TutorialD.Interpreter.DatabaseContextIOOperator
9+import TutorialD.Interpreter.TransGraphRelationalOperator
10+import TutorialD.Interpreter.SchemaOperator
911
1012import TutorialD.Interpreter.Import.CSV
1113import TutorialD.Interpreter.Import.TutorialD
@@ -16,19 +18,23 @@ import TutorialD.Interpreter.Export.CSV
1618import TutorialD.Interpreter.Export.Base
1719
1820import ProjectM36.Base
21+import ProjectM36.Error
1922import ProjectM36.Relation.Show.Term
2023import ProjectM36.TransactionGraph
2124import qualified ProjectM36.Client as C
2225import ProjectM36.Relation (attributes)
2326
24−import Text.Parsec
25−import Text.Parsec.String
26−import Control.Monad.State
2727import System.Console.Haskeline
2828import System.Directory (getHomeDirectory)
2929import qualified Data.Text as T
30−import Data.Maybe (fromMaybe)
3130import System.IO (hPutStrLn, stderr)
31+#if __GLASGOW_HASKELL__ < 804
32+import Data.Monoid
33+#endif
34+import Data.List (isPrefixOf)
35+import Control.Exception
36+import System.Exit
37+import Data.Either (fromRight)
3238
3339{-
3440context ops are read-only operations which only operate on the database context (relvars and constraints)
@@ -40,112 +46,154 @@ data ParsedOperation = RODatabaseContextOp RODatabaseContextOperator |
4046 DatabaseContextIOExprOp DatabaseContextIOExpr |
4147 InfoOp InformationOperator |
4248 GraphOp TransactionGraphOperator |
49+ ConvenienceGraphOp ConvenienceTransactionGraphOperator |
4350 ROGraphOp ROTransactionGraphOperator |
4451 ImportRelVarOp RelVarDataImportOperator |
4552 ImportDBContextOp DatabaseContextDataImportOperator |
4653 ImportBasicExampleOp ImportBasicExampleOperator |
47− RelVarExportOp RelVarDataExportOperator
54+ RelVarExportOp RelVarDataExportOperator |
55+ TransGraphRelationalOp TransGraphRelationalOperator |
56+ SchemaOp SchemaOperator
57+ deriving (Show)
4858
4959interpreterParserP :: Parser ParsedOperation
5060interpreterParserP = safeInterpreterParserP <|>
51− liftM ImportRelVarOp (importCSVP <* eof) <|>
52− liftM ImportDBContextOp (tutdImportP <* eof) <|>
53− liftM RelVarExportOp (exportCSVP <* eof) <|>
54− liftM DatabaseContextIOExprOp (addAtomFunctionExprP <* eof)
55−
61+ fmap ImportRelVarOp (importCSVP <* eof) <|>
62+ fmap ImportDBContextOp (tutdImportP <* eof) <|>
63+ fmap RelVarExportOp (exportCSVP <* eof) <|>
64+ fmap DatabaseContextIOExprOp (dbContextIOExprP <* eof)
65+
5666-- the safe interpreter never reads or writes the file system
5767safeInterpreterParserP :: Parser ParsedOperation
58−safeInterpreterParserP = liftM RODatabaseContextOp (roDatabaseContextOperatorP <* eof) <|>
59− liftM InfoOp (infoOpP <* eof) <|>
60− liftM GraphOp (transactionGraphOpP <* eof) <|>
61− liftM ROGraphOp (roTransactionGraphOpP <* eof) <|>
62− liftM DatabaseContextExprOp (databaseExprOpP <* eof) <|>
63− liftM ImportBasicExampleOp (importBasicExampleOperatorP <* eof)
64−
68+safeInterpreterParserP = fmap RODatabaseContextOp (roDatabaseContextOperatorP <* eof) <|>
69+ fmap InfoOp (infoOpP <* eof) <|>
70+ fmap GraphOp (transactionGraphOpP <* eof) <|>
71+ fmap ConvenienceGraphOp (convenienceTransactionGraphOpP <* eof) <|>
72+ fmap ROGraphOp (roTransactionGraphOpP <* eof) <|>
73+ fmap DatabaseContextExprOp (databaseExprOpP <* eof) <|>
74+ fmap ImportBasicExampleOp (importBasicExampleOperatorP <* eof) <|>
75+ fmap TransGraphRelationalOp (transGraphRelationalOpP <* eof) <|>
76+ fmap SchemaOp (schemaOperatorP <* eof)
6577
66−promptText :: Maybe HeadName -> StringType
67−promptText mHeadName = "TutorialD (" `T.append` transInfo `T.append` "): "
78+promptText :: Either RelationalError HeadName -> Either RelationalError SchemaName -> StringType
79+promptText eHeadName eSchemaName = "TutorialD (" <> transInfo <> "): "
6880 where
69− transInfo = fromMaybe "<unknown>" mHeadName
70−
71−parseTutorialD :: String -> Either ParseError ParsedOperation
72−parseTutorialD inputString = parse interpreterParserP "" inputString
81+ transInfo = fromRight "<unknown>" eHeadName <> "/" <> fromRight "<no schema>" eSchemaName
82+
83+parseTutorialD :: T.Text -> Either ParserError ParsedOperation
84+parseTutorialD = parse interpreterParserP ""
7385
7486--only parse tutoriald which doesn't result in file I/O
75−safeParseTutorialD :: String -> Either ParseError ParsedOperation
76−safeParseTutorialD inputString = parse safeInterpreterParserP "" inputString
87+safeParseTutorialD :: T.Text -> Either ParserError ParsedOperation
88+safeParseTutorialD = parse safeInterpreterParserP ""
7789
7890data SafeEvaluationFlag = SafeEvaluation | UnsafeEvaluation deriving (Eq)
7991
92+type InteractiveConsole = Bool
93+
94+evalTutorialD :: C.SessionId -> C.Connection -> SafeEvaluationFlag -> ParsedOperation -> IO TutorialDOperatorResult
95+evalTutorialD sessionId conn safe = evalTutorialDInteractive sessionId conn safe False
96+
8097--execute the operation and display result
81−evalTutorialD :: C.SessionId -> C.Connection -> SafeEvaluationFlag -> ParsedOperation -> IO (TutorialDOperatorResult)
82−evalTutorialD sessionId conn safe expr = case expr of
83−
98+evalTutorialDInteractive :: C.SessionId -> C.Connection -> SafeEvaluationFlag -> InteractiveConsole -> ParsedOperation -> IO TutorialDOperatorResult
99+evalTutorialDInteractive sessionId conn safe interactive expr = case expr of
84100 --this does not pass through the ProjectM36.Client library because the operations
85101 --are specific to the interpreter, though some operations may be of general use in the future
86102 (RODatabaseContextOp execOp) -> do
87− evalRODatabaseContextOp sessionId conn execOp
88−
89− (DatabaseContextExprOp execOp) -> do
90− maybeErr <- C.executeDatabaseContextExpr sessionId conn execOp
91− case maybeErr of
92− Just err -> barf err
93− Nothing -> return QuietSuccessResult
94−
95− (DatabaseContextIOExprOp execOp) -> do
103+ res <- evalRODatabaseContextOp sessionId conn execOp
104+ case res of
105+ QuitResult -> if safe == UnsafeEvaluation && interactive then
106+ putStrLn "Goodbye." >> exitSuccess
107+ else
108+ pure res
109+ _ -> pure res
110+
111+ (DatabaseContextExprOp execOp) ->
112+ eHandler $ C.executeDatabaseContextExpr sessionId conn execOp
113+
114+ (DatabaseContextIOExprOp execOp) ->
96115 if needsSafe then
97116 unsafeError
98− else do
99− mErr <- C.executeDatabaseContextIOExpr sessionId conn execOp
100− case mErr of
101− Just err -> barf err
102− Nothing -> pure QuietSuccessResult
103−
117+ else
118+ eHandler $ C.executeDatabaseContextIOExpr sessionId conn execOp
119+
104120 (GraphOp execOp) -> do
105− maybeErr <- C.executeGraphExpr sessionId conn execOp
106− case maybeErr of
107− Just err -> barf err
108− Nothing -> return QuietSuccessResult
121+ -- warn if the graph op could cause uncommited changes to be discarded
122+ eIsDirty <- C.disconnectedTransactionIsDirty sessionId conn
123+ let runGraphOp = eHandler $ C.executeGraphExpr sessionId conn execOp
124+ settings = Settings {complete = noCompletion,
125+ historyFile = Nothing,
126+ autoAddHistory = False}
127+ case eIsDirty of
128+ Left err -> barf err
129+ Right False -> runGraphOp
130+ Right True -> do
131+ cancel <- runInputT settings $ do
132+ let promptDiscardChanges = do
133+ isatty <- haveTerminalUI
134+ if isatty && interactive && execOp /= Commit && execOp /= Rollback then do
135+ mYesOrNo <- getInputLine "The current transaction has uncommitted changes. If you continue, the changes will be lost. Continue? (Y/n): "
136+ case mYesOrNo of
137+ Nothing -> promptDiscardChanges
138+ Just "" -> promptDiscardChanges
139+ Just yesOrNo -> pure (not ("Y" `isPrefixOf` yesOrNo))
140+ else
141+ pure False
142+ promptDiscardChanges
143+ if cancel then
144+ pure (DisplayErrorResult "Graph operation cancelled.")
145+ else
146+ runGraphOp
147+
148+ (ConvenienceGraphOp execOp) ->
149+ eHandler $ evalConvenienceGraphOp sessionId conn execOp
109150
110151 (ROGraphOp execOp) -> do
111152 opResult <- evalROGraphOp sessionId conn execOp
112− case opResult of
153+ case opResult of
113154 Left err -> barf err
114155 Right rel -> pure (DisplayRelationResult rel)
115−
116− (ImportRelVarOp execOp@(RelVarDataImportOperator relVarName _ _)) -> do
156+
157+ (SchemaOp execOp) ->
158+ eHandler $ evalSchemaOperator sessionId conn execOp
159+
160+ (ImportRelVarOp execOp@(RelVarDataImportOperator relVarName _ _)) ->
117161 if needsSafe then
118162 unsafeError
119163 else do
120164 -- collect attributes from relvar name
121165 -- is there a race condition here? The attributes of the relvar may have since changed, no?
122− eImportType <- C.typeForRelationalExpr sessionId conn (RelationVariable relVarName)
166+ eImportType <- C.typeForRelationalExpr sessionId conn (RelationVariable relVarName ())
123167 case eImportType of
124168 Left err -> barf err
125169 Right importType -> do
126− exprErr <- evalRelVarDataImportOperator execOp (attributes importType)
127− case exprErr of
170+ eTConsMap <- C.typeConstructorMapping sessionId conn
171+ case eTConsMap of
128172 Left err -> barf err
129− Right dbexpr -> evalTutorialD sessionId conn safe (DatabaseContextExprOp dbexpr)
130−
131− (ImportDBContextOp execOp) -> do
173+ Right tConsMap -> do
174+ exprErr <- evalRelVarDataImportOperator execOp tConsMap (attributes importType)
175+ case exprErr of
176+ Left err -> barf err
177+ Right dbexpr -> evalTutorialD sessionId conn safe (DatabaseContextExprOp dbexpr)
178+
179+ (ImportDBContextOp execOp) ->
132180 if needsSafe then
133181 unsafeError
134182 else do
135− mDbexprs <- evalDatabaseContextDataImportOperator execOp
136− case mDbexprs of
183+ eErr <- evalDatabaseContextDataImportOperator execOp
184+ case eErr of
137185 Left err -> barf err
138186 Right dbexprs -> evalTutorialD sessionId conn safe (DatabaseContextExprOp dbexprs)
139−
140− (InfoOp execOp) -> do
187+
188+ (InfoOp execOp) ->
141189 if needsSafe then
142190 unsafeError
143191 else
144192 case evalInformationOperator execOp of
145− Left err -> barf err
193+ Left err -> pure (DisplayErrorResult err)
146194 Right info -> pure (DisplayResult info)
147−
148− (RelVarExportOp execOp@(RelVarDataExportOperator relExpr _ _)) -> do
195+
196+ (RelVarExportOp execOp@(RelVarDataExportOperator relExpr _ _)) ->
149197 --eval relexpr to relation and pass to export function
150198 if needsSafe then
151199 unsafeError
@@ -161,36 +209,64 @@ evalTutorialD sessionId conn safe expr = case expr of
161209 (ImportBasicExampleOp execOp) -> do
162210 let dbcontextexpr = evalImportBasicExampleOperator execOp
163211 evalTutorialD sessionId conn safe (DatabaseContextExprOp dbcontextexpr)
212+ (TransGraphRelationalOp execOp) ->
213+ evalTransGraphRelationalOp sessionId conn execOp
164214 where
165215 needsSafe = safe == SafeEvaluation
166216 unsafeError = pure $ DisplayErrorResult "File I/O operation prohibited."
217+ barf :: RelationalError -> IO TutorialDOperatorResult
218+ barf (ScriptError (OtherScriptCompilationError errStr)) = pure (DisplayErrorResult (T.pack errStr))
219+ barf (ParseError err) = pure (DisplayErrorResult err)
167220 barf err = return $ DisplayErrorResult (T.pack (show err))
168−
169−type GhcPkgPath = String
170−data InterpreterConfig = LocalInterpreterConfig PersistenceStrategy HeadName [GhcPkgPath] |
171− RemoteInterpreterConfig C.NodeId C.DatabaseName HeadName
221+ eHandler io = do
222+ eErr <- io
223+ case eErr of
224+ Left err -> barf err
225+ Right () -> return QuietSuccessResult
226+
227+type GhcPkgPath = String
228+type TutorialDExec = String
229+type CheckFS = Bool
230+
231+data InterpreterConfig = LocalInterpreterConfig PersistenceStrategy HeadName (Maybe TutorialDExec) [GhcPkgPath] CheckFS |
232+ RemoteInterpreterConfig C.Hostname C.Port C.DatabaseName HeadName (Maybe TutorialDExec) CheckFS
172233
173234outputNotificationCallback :: C.NotificationCallback
174−outputNotificationCallback notName evaldNot = hPutStrLn stderr $ "Notification received " ++ show notName ++ ":\n" ++ show (reportExpr (C.notification evaldNot)) ++ "\n" ++ prettyEvaluatedNotification evaldNot
235+outputNotificationCallback notName evaldNot = hPutStrLn stderr $ "Notification received " ++ show notName ++ ":\n" ++ "\n" ++ prettyEvaluatedNotification evaldNot
175236
176237prettyEvaluatedNotification :: C.EvaluatedNotification -> String
177−prettyEvaluatedNotification eNotif = case C.reportRelation eNotif of
178− Left err -> show err
179− Right reportRel -> T.unpack (showRelation reportRel)
238+prettyEvaluatedNotification eNotif = let eRelShow eRel = case eRel of
239+ Left err -> show err
240+ Right reportRel -> T.unpack (showRelation reportRel) in
241+ eRelShow (C.reportOldRelation eNotif) <> "\n" <> eRelShow (C.reportNewRelation eNotif)
180242
181243reprLoop :: InterpreterConfig -> C.SessionId -> C.Connection -> IO ()
182244reprLoop config sessionId conn = do
183245 homeDirectory <- getHomeDirectory
184246 let settings = defaultSettings {historyFile = Just (homeDirectory ++ "/.tutd_history")}
185− mHeadName <- C.headName sessionId conn
186− maybeLine <- runInputT settings $ getInputLine (T.unpack (promptText mHeadName))
247+ eHeadName <- C.headName sessionId conn
248+ eSchemaName <- C.currentSchemaName sessionId conn
249+ let prompt = promptText eHeadName eSchemaName
250+ catchInterrupt = handleJust (\case
251+ UserInterrupt -> Just Nothing
252+ _ -> Nothing) (\_ -> do
253+ hPutStrLn stderr "Statement cancelled. Use \":quit\" to exit tutd."
254+ pure (Just ""))
255+ maybeLine <- catchInterrupt $ runInputT settings $ getInputLine (T.unpack prompt)
187256 case maybeLine of
188257 Nothing -> return ()
189258 Just line -> do
190− case parseTutorialD line of
191− Left err -> do
192− displayOpResult $ DisplayErrorResult (T.pack (show err))
193− Right parsed -> do
194− evald <- evalTutorialD sessionId conn UnsafeEvaluation parsed
195− displayOpResult evald
259+ runTutorialD sessionId conn (Just (T.length prompt)) (T.pack line)
196260 reprLoop config sessionId conn
261+
262+
263+runTutorialD :: C.SessionId -> C.Connection -> Maybe PromptLength -> T.Text -> IO ()
264+runTutorialD sessionId conn mPromptLength tutd =
265+ case parseTutorialD tutd of
266+ Left err ->
267+ displayOpResult $ DisplayParseErrorResult mPromptLength err
268+ Right parsed ->
269+ catchJust (\exc -> if exc == C.RequestTimeoutException then Just exc else Nothing) (do
270+ evald <- evalTutorialDInteractive sessionId conn UnsafeEvaluation True parsed
271+ displayOpResult evald)
272+ (\_ -> displayOpResult (DisplayErrorResult "Request timed out."))
src/bin/TutorialD/Interpreter/Base.hs+200−102
@@ -1,147 +1,245 @@
1−{-# LANGUAGE DeriveGeneric #-}
2−module TutorialD.Interpreter.Base where
3−import Text.Parsec
4−import Text.Parsec.String
5−import qualified Text.Parsec.Token as Token
6−import Text.Parsec.Language
1+{-# LANGUAGE DeriveGeneric, CPP #-}
2+module TutorialD.Interpreter.Base (
3+ module TutorialD.Interpreter.Base,
4+ module Text.Megaparsec,
5+#if MIN_VERSION_megaparsec(6,0,0)
6+ module Text.Megaparsec.Char,
7+ module Control.Applicative
8+#else
9+ module Text.Megaparsec.Text
10+#endif
11+ )
12+ where
713import ProjectM36.Base
814import ProjectM36.AtomType
15+import ProjectM36.Attribute as A
16+import ProjectM36.Relation
17+import ProjectM36.DataFrame
18+
19+#if MIN_VERSION_megaparsec(6,0,0)
20+import Text.Megaparsec.Char
21+import qualified Text.Megaparsec.Char.Lexer as Lex
22+import Text.Megaparsec
23+import Data.Void
24+import Control.Applicative hiding (many, some)
25+#else
26+import Text.Megaparsec.Text
27+import qualified Text.Megaparsec.Lexer as Lex
28+#endif
29+
30+import Data.Text hiding (count)
31+import System.Random
932import qualified Data.Text as T
1033import qualified Data.List as L
11−import qualified Data.Vector as V
1234import qualified Data.Text.IO as TIO
1335import System.IO
1436import ProjectM36.Relation.Show.Term
1537import GHC.Generics
38+#if __GLASGOW_HASKELL__ < 804
39+import Data.Monoid
40+#endif
41+import qualified Data.UUID as U
42+import Control.Monad.Random
43+import Data.List.NonEmpty as NE
44+import Data.Time.Clock
45+import Data.Time.Format
46+import Control.Monad (void)
47+import Data.Char
48+
49+#if !MIN_VERSION_megaparsec(7,0,0)
50+anySingle :: Parsec Void Text (Token Text)
51+anySingle = anyChar
52+#endif
1653
1754displayOpResult :: TutorialDOperatorResult -> IO ()
1855displayOpResult QuitResult = return ()
1956displayOpResult (DisplayResult out) = TIO.putStrLn out
2057displayOpResult (DisplayIOResult ioout) = ioout
21−displayOpResult (DisplayErrorResult err) = TIO.hPutStrLn stderr ("ERR: " `T.append` err)
58+displayOpResult (DisplayErrorResult err) = let outputf = if T.length err > 0 && T.last err /= '\n' then TIO.hPutStrLn else TIO.hPutStr in
59+ outputf stderr ("ERR: " <> err)
2260displayOpResult QuietSuccessResult = return ()
23−displayOpResult (DisplayRelationResult rel) = TIO.putStrLn (showRelation rel)
24−
25−lexer :: Token.TokenParser ()
26−lexer = Token.makeTokenParser tutD
27− where tutD = emptyDef {
28− Token.reservedOpNames = ["join", "where", "union", "group", "ungroup"],
29− Token.reservedNames = [],
30− Token.identStart = letter <|> char '_',
31− Token.opLetter = oneOf ":!#$%&*+./<=>?\\^|-~", -- remove "@" so it can be used as attribute marker without spaces
32− Token.identLetter = alphaNum <|> char '_' <|> char '#'} -- # needed for Date examples
33−
34−parens :: Parser a -> Parser a
35−parens = Token.parens lexer
61+displayOpResult (DisplayRelationResult rel) = do
62+ gen <- newStdGen
63+ let randomlySortedRel = evalRand (randomizeTupleOrder rel) gen
64+ TIO.putStrLn (showRelation randomlySortedRel)
65+displayOpResult (DisplayParseErrorResult mPromptLength err) = do
66+#if MIN_VERSION_megaparsec(7,0,0)
67+ let errorIndent = errorOffset . NE.head . bundleErrors $ err
68+ errString = T.pack (parseErrorPretty . NE.head . bundleErrors $ err)
69+#else
70+ let errorIndent = unPos (sourceColumn (NE.head (errorPos err)))
71+ errString = T.pack (parseErrorPretty err)
72+#endif
73+ pointyString len = T.justifyRight (len + fromIntegral errorIndent) '_' "^"
74+ maybe (pure ()) (TIO.putStrLn . pointyString) mPromptLength
75+ TIO.putStr ("ERR:" <> errString)
76+displayOpResult (DisplayDataFrameResult dFrame) = TIO.putStrLn (showDataFrame dFrame)
77+
78+#if MIN_VERSION_megaparsec(6,0,0)
79+type Parser = Parsec Void Text
80+type ParseStr = Text
81+#else
82+type ParseStr = String
83+#endif
84+
85+-- consumes only horizontal spaces
86+spaceConsumer :: Parser ()
87+spaceConsumer = Lex.space space1 (Lex.skipLineComment "--") (Lex.skipBlockComment "{-" "-}")
88+
89+opChar :: Parser Char
90+opChar = oneOf (":!#$%&*+./<=>?\\^|-~" :: String)-- remove "@" so it can be used as attribute marker without spaces
91+
92+reserved :: ParseStr -> Parser ()
93+reserved word = try (string word *> notFollowedBy opChar *> spaceConsumer)
94+
95+reservedOp :: ParseStr -> Parser ()
96+reservedOp op = try (spaceConsumer *> string op *> notFollowedBy opChar *> spaceConsumer)
3697
37−reservedOp :: String -> Parser ()
38−reservedOp = Token.reservedOp lexer
39−
40−reserved :: String -> Parser ()
41−reserved = Token.reserved lexer
98+parens :: Parser a -> Parser a
99+parens = between (symbol "(") (symbol ")")
42100
43101braces :: Parser a -> Parser a
44−braces = Token.braces lexer
102+braces = between (symbol "{") (symbol "}")
45103
46−identifier :: Parser String
47−identifier = Token.identifier lexer
104+identifier :: Parser Text
105+identifier = do
106+ istart <- letterChar <|> char '_'
107+ identifierRemainder istart
48108
49−symbol :: String -> Parser String
50−symbol = Token.symbol lexer
109+identifierRemainder :: Char -> Parser Text
110+identifierRemainder c = do
111+ rest <- many (alphaNumChar <|> char '_' <|> char '#')
112+ spaceConsumer
113+ pure (pack (c:rest))
51114
52−comma :: Parser String
53−comma = Token.comma lexer
115+symbol :: ParseStr -> Parser Text
116+#if MIN_VERSION_megaparsec(6,0,0)
117+symbol sym = Lex.symbol spaceConsumer sym
118+#else
119+symbol sym = pack <$> Lex.symbol spaceConsumer sym
120+#endif
54121
55−pipe :: Parser String
56−pipe = Token.symbol lexer "|"
122+comma :: Parser Text
123+comma = symbol ","
57124
58−quote :: Parser String
59−quote = Token.symbol lexer "\""
125+pipe :: Parser Text
126+pipe = symbol "|"
60127
61−tripleQuote :: Parser String
62−tripleQuote = Token.symbol lexer "\"\"\""
128+quote :: Parser Text
129+quote = symbol "\""
63130
64−arrow :: Parser String
65−arrow = Token.symbol lexer "->"
131+tripleQuote :: Parser Text
132+tripleQuote = symbol "\"\"\""
66133
67−semi :: Parser String
68−semi = Token.semi lexer
134+arrow :: Parser Text
135+arrow = symbol "->"
69136
70−whiteSpace :: Parser ()
71−whiteSpace = Token.whiteSpace lexer
137+semi :: Parser Text
138+semi = symbol ";"
139+
140+nline :: Parser Text
141+nline = (T.singleton <$> newline) <|> crlf
72142
73143integer :: Parser Integer
74−integer = Token.integer lexer
144+#if MIN_VERSION_megaparsec(6,0,0)
145+integer = Lex.signed (pure ()) Lex.decimal <* spaceConsumer
146+#else
147+integer = Lex.signed (pure ()) Lex.integer <* spaceConsumer
148+#endif
149+
150+natural :: Parser Integer
151+#if MIN_VERSION_megaparsec(6,0,0)
152+natural = Lex.decimal <* spaceConsumer
153+#else
154+natural = Lex.integer <* spaceConsumer
155+#endif
75156
76157float :: Parser Double
77−float = Token.float lexer
78−
79−capitalizedIdentifier :: Parser String
80−capitalizedIdentifier = do
81− fletter <- upper
82− rest <- option "" identifier
83− spaces
84− pure $ fletter:rest
85−
86−uncapitalizedIdentifier :: Parser String
87−uncapitalizedIdentifier = do
88− fletter <- lower
89− rest <- option "" identifier
90− spaces
91− pure (fletter:rest)
92−
93−showRelationAttributes :: Attributes -> T.Text
94−showRelationAttributes attrs = "{" `T.append` T.concat (L.intersperse ", " $ map showAttribute attrsL) `T.append` "}"
158+float = Lex.float <* spaceConsumer
159+
160+capitalizedIdentifier :: Parser Text
161+capitalizedIdentifier =
162+ upperChar >>= identifierRemainder
163+
164+uncapitalizedIdentifier :: Parser Text
165+uncapitalizedIdentifier =
166+ lowerChar >>= identifierRemainder
167+
168+showRelationAttributes :: Attributes -> Text
169+showRelationAttributes attrs = "{" <> T.concat (L.intersperse ", " $ L.map showAttribute attrsL) <> "}"
95170 where
96− showAttribute (Attribute name atomType) = name `T.append` " " `T.append` prettyAtomType atomType
97− attrsL = V.toList attrs
171+ showAttribute (Attribute name atomType') = name <> " " <> prettyAtomType atomType'
172+ attrsL = A.toList attrs
173+
174+type PromptLength = Int
175+
176+#if MIN_VERSION_megaparsec(7,0,0)
177+type ParserError = ParseErrorBundle T.Text Void
178+#elif MIN_VERSION_megaparsec(6,0,0)
179+type ParserError = ParseError Char Void
180+#else
181+type ParserError = ParseError Char Dec
182+#endif
98183
99184data TutorialDOperatorResult = QuitResult |
100185 DisplayResult StringType |
101186 DisplayIOResult (IO ()) |
102187 DisplayRelationResult Relation |
188+ DisplayDataFrameResult DataFrame |
103189 DisplayErrorResult StringType |
190+ DisplayParseErrorResult (Maybe PromptLength) ParserError | -- PromptLength refers to length of prompt text
104191 QuietSuccessResult
105192 deriving (Generic)
106−
107−type TransactionGraphWasUpdated = Bool
108193
109−{-
110−quotedChar :: Parser Char
111−quotedChar = noneOf "\""
112− <|> try (string "\"\"" >> return '"')
113−
114−quotedString :: Parser String
115−quotedString = string "\"" *> many quotedChar <* string "\"" <* whiteSpace
116−-}
117−escapedString :: Parser String
118−escapedString = do
119− _ <- char '\\'
120− let lookupAssoc = [('n',"\n"), ('\"',"\""), ('\\', "\\")]
121− c <- oneOf "\\\"n" -- all the characters which can be escaped
122− case lookup c lookupAssoc of
123− Just v -> pure v
124− Nothing -> fail "failed to handle escaped character"
125−
126−--http://stackoverflow.com/questions/24106314/parser-for-quoted-string-using-parsec
127−nonEscapedChar :: Parser Char
128−nonEscapedChar = noneOf "\\\""
129−
130−character :: Parser String
131−character = fmap return nonEscapedChar <|> escapedString
194+type TransactionGraphWasUpdated = Bool
132195
133196--allow for python-style triple quoting because guessing the correct amount of escapes in different contexts is annoying
134−tripleQuotedString :: Parser String
197+tripleQuotedString :: Parser Text
135198tripleQuotedString = do
136199 _ <- tripleQuote
137− manyTill anyChar (try (tripleQuote >> notFollowedBy quote))
200+ pack <$> manyTill anySingle (try (tripleQuote >> notFollowedBy quote))
201+
202+normalQuotedString :: Parser Text
203+normalQuotedString = quote *> (T.pack <$> manyTill Lex.charLiteral quote)
204+
205+quotedString :: Parser Text
206+quotedString = try tripleQuotedString <|> normalQuotedString
207+
208+quoted :: Parser a -> Parser a
209+quoted = between quote quote
210+
211+uuidP :: Parser U.UUID
212+uuidP = do
213+ uuidStart <- count 8 hexDigitChar
214+ _ <- char '-' -- min 28 with no dashes, maximum 4 dashes
215+ uuidMid1 <- count 4 hexDigitChar
216+ _ <- char '-'
217+ uuidMid2 <- count 4 hexDigitChar
218+ _ <- char '-'
219+ uuidMid3 <- count 4 hexDigitChar
220+ _ <- char '-'
221+ uuidEnd <- count 12 hexDigitChar
222+ let uuidStr = L.intercalate "-" [uuidStart, uuidMid1, uuidMid2, uuidMid3, uuidEnd]
223+ case U.fromString uuidStr of
224+ Nothing -> fail "Invalid uuid string"
225+ Just uuid -> return uuid
226+
227+utcTimeP :: Parser UTCTime
228+utcTimeP = do
229+ timeStr <- quotedString
230+ case parseTimeM True defaultTimeLocale "%Y-%m-%d %H:%M:%S" (T.unpack timeStr) of
231+ Nothing -> fail "invalid datetime input, use \"YYYY-MM-DD HH:MM:SS\""
232+ Just stamp' -> pure stamp'
233+
234+
235+colonOp :: Text -> Parser ()
236+colonOp opStr = do
237+ _ <- string opStr <* (void spaceChar <|> eof) <* spaceConsumer
238+ pure ()
239+
240+hex :: Parser Text
241+hex = takeWhileP (Just "hexadecimal")
242+ (\c ->
243+ isDigit c
244+ || (c >= 'a' && c <= 'f'))
138245
139−normalQuotedString :: Parser String
140−normalQuotedString = do
141− _ <- quote
142− strings <- many character
143− _ <- quote
144− pure (concat strings)
145−
146−quotedString :: Parser String
147−quotedString = try tripleQuotedString <|> normalQuotedString
src/bin/TutorialD/Interpreter/DataTypes/DateTime.hsdeleted−22
@@ -1,22 +0,0 @@
1−module TutorialD.Interpreter.DataTypes.DateTime where
2−import Text.Parsec
3−import ProjectM36.Base
4−import Text.Parsec.String
5−import TutorialD.Interpreter.Base
6−import Data.Time.Clock
7−import Data.Time.Format
8−
9−dateTimeAtomP :: Parser Atom
10−dateTimeAtomP = do
11− dateTime' <- try $ do
12− dateTime <- dateTimeStringP
13− reserved "::datetime"
14− return dateTime
15− return $ Atom dateTime'
16−
17−dateTimeStringP :: Parser UTCTime
18−dateTimeStringP = do
19− dateTimeString <- quotedString
20− case parseTimeM False defaultTimeLocale "%Y-%m-%d %H:%M:%S" dateTimeString of
21− Just utctime -> return $ (utctime :: UTCTime)
22− Nothing -> fail $ "Failed to parse datetime from " ++ dateTimeString
src/bin/TutorialD/Interpreter/DataTypes/Interval.hsdeleted−35
@@ -1,35 +0,0 @@
1−module TutorialD.Interpreter.DataTypes.Interval where
2−import Text.Parsec
3−import Text.Parsec.String
4−import ProjectM36.Base hiding (Finite)
5−import ProjectM36.DataTypes.Interval ()
6−import TutorialD.Interpreter.Base
7−import TutorialD.Interpreter.DataTypes.DateTime
8−import Data.Interval
9−import Data.Time.Clock
10−
11−intervalP :: (Ord a) => Parser (Extended a) -> Parser (Interval a)
12−intervalP unitP = do
13− lBoundClosed <- string "(" *> return False <|>
14− string "[" *> return True
15− lBound <- unitP
16− reservedOp ","
17− uBound <- unitP
18−
19− uBoundClosed <- string ")" *> return False <|>
20− string "]" *> return True
21−
22− return $ interval (lBound, lBoundClosed) (uBound, uBoundClosed)
23−
24−intervalDateTimeUnitP :: Parser (Extended UTCTime)
25−intervalDateTimeUnitP = Finite <$> dateTimeStringP <|>
26− (reserved "inf" *> return PosInf) <|>
27− (reserved "-inf" *> return NegInf)
28−
29−intervalDateTimeAtomP :: Parser Atom
30−intervalDateTimeAtomP = do
31− reserved "interval_datetime("
32− intv <- intervalP intervalDateTimeUnitP
33− reserved ")"
34− return $ Atom intv
35−
src/bin/TutorialD/Interpreter/DatabaseContextExpr.hs+101−67
@@ -1,91 +1,93 @@
1+{-# LANGUAGE CPP #-}
12module TutorialD.Interpreter.DatabaseContextExpr where
2−import Text.Parsec
3−import Text.Parsec.String
43import ProjectM36.Base
54import TutorialD.Interpreter.Base
65import qualified Data.Text as T
76import TutorialD.Interpreter.RelationalExpr
87import TutorialD.Interpreter.Types
98import qualified Data.Map as M
10−import Control.Monad.State
119import ProjectM36.StaticOptimizer
10+import qualified ProjectM36.Error as PM36E
1211import ProjectM36.Error
13−import ProjectM36.RelationalExpression
12+import qualified ProjectM36.RelationalExpression as RE
1413import ProjectM36.Key
14+import ProjectM36.FunctionalDependency
15+#if __GLASGOW_HASKELL__ < 804
16+import Data.Monoid
17+#endif
18+import Data.Functor
1519
1620--parsers which create "database expressions" which modify the database context (such as relvar assignment)
17−databaseExprP :: Parser DatabaseContextExpr
18−databaseExprP = choice $ map (\p -> p <* optional commentP) [insertP,
19− deleteConstraintP,
20− deleteP,
21− updateP,
22− addConstraintP,
23− keyP,
24− defineP,
25− undefineP,
26− assignP,
27− addNotificationP,
28− removeNotificationP,
29− addTypeConstructorP,
30− removeTypeConstructorP,
31− nothingP]
32−
33−commentP :: Parser DatabaseContextExpr
34−commentP = reserved "--" >> manyTill anyChar eof >> pure NoOperation
21+databaseContextExprP :: Parser DatabaseContextExpr
22+databaseContextExprP = choice [insertP,
23+ deleteConstraintP,
24+ deleteP,
25+ updateP,
26+ addConstraintP,
27+ keyP,
28+ funcDepP,
29+ defineP,
30+ undefineP,
31+ assignP,
32+ addNotificationP,
33+ removeNotificationP,
34+ addTypeConstructorP,
35+ removeTypeConstructorP,
36+ removeAtomFunctionP,
37+ executeDatabaseContextFunctionP,
38+ removeDatabaseContextFunctionP,
39+ nothingP]
3540
3641nothingP :: Parser DatabaseContextExpr
37−nothingP = whiteSpace >> pure NoOperation
42+nothingP = spaceConsumer >> pure NoOperation
3843
3944assignP :: Parser DatabaseContextExpr
4045assignP = do
4146 relVarName <- try $ do
42− relVarName <- identifier
47+ relVarName <- relVarNameP
4348 reservedOp ":="
4449 return relVarName
45− expr <- relExprP
46− return $ Assign (T.pack relVarName) expr
50+ Assign relVarName <$> relExprP
51+
52+multilineSep :: Parser T.Text
53+multilineSep = newline >> pure "\n"
4754
4855multipleDatabaseContextExprP :: Parser DatabaseContextExpr
4956multipleDatabaseContextExprP = do
50− exprs <- sepBy1 databaseExprP semi
51− return $ MultipleExpr exprs
57+ exprs <- filter (/= NoOperation) <$> sepBy1 databaseContextExprP semi
58+ pure (MultipleExpr exprs)
5259
5360insertP :: Parser DatabaseContextExpr
5461insertP = do
5562 reservedOp "insert"
56− relvar <- identifier
57− expr <- relExprP
58− return $ Insert (T.pack relvar) expr
63+ relvar <- relVarNameP
64+ Insert relvar <$> relExprP
5965
6066defineP :: Parser DatabaseContextExpr
6167defineP = do
6268 relVarName <- try $ do
63− relVarName <- identifier
69+ relVarName <- relVarNameP
6470 reservedOp "::"
6571 return relVarName
66− attributeSet <- makeAttributeExprsP
67− return $ Define (T.pack relVarName) attributeSet
72+ Define relVarName <$> makeAttributeExprsP
6873
6974undefineP :: Parser DatabaseContextExpr
7075undefineP = do
7176 reservedOp "undefine"
72− relVarName <- identifier
73− return $ Undefine (T.pack relVarName)
77+ Undefine <$> relVarNameP
7478
7579deleteP :: Parser DatabaseContextExpr
7680deleteP = do
7781 reservedOp "delete"
78− relVarName <- identifier
79− predicate <- option TruePredicate (reservedOp "where" *> restrictionPredicateP)
80− return $ Delete (T.pack relVarName) predicate
82+ Delete <$> relVarNameP <*> option TruePredicate (reservedOp "where" *> restrictionPredicateP)
8183
8284updateP :: Parser DatabaseContextExpr
8385updateP = do
8486 reservedOp "update"
85− relVarName <- identifier
86− predicate <- option TruePredicate (reservedOp "where" *> restrictionPredicateP <* spaces)
87− attributeAssignments <- liftM M.fromList $ parens (sepBy attributeAssignmentP comma)
88− return $ Update (T.pack relVarName) (M.mapKeys T.pack $ attributeAssignments) predicate
87+ relVarName <- relVarNameP
88+ predicate <- option TruePredicate (reservedOp "where" *> restrictionPredicateP <* spaceConsumer)
89+ attributeAssignments <- M.fromList <$> parens (sepBy attributeAssignmentP comma)
90+ return $ Update relVarName attributeAssignments predicate
8991
9092data IncDepOp = SubsetOp | EqualityOp
9193
@@ -94,11 +96,11 @@ addConstraintP = do
9496 reservedOp "constraint" <|> reservedOp "foreign key"
9597 constraintName <- identifier
9698 subset <- relExprP
97− op <- (reservedOp "in" *> pure SubsetOp) <|> (reservedOp "equals" *> pure EqualityOp)
99+ op <- (reservedOp "in" $> SubsetOp) <|> (reservedOp "equals" $> EqualityOp)
98100 superset <- relExprP
99101 let subsetA = incDepSet constraintName subset superset
100− subsetB = incDepSet (constraintName ++ "_eqInvert") superset subset --inverted args for equality constraint
101− incDepSet nam a b = AddInclusionDependency (T.pack nam) (InclusionDependency a b)
102+ subsetB = incDepSet (constraintName <> "_eqInvert") superset subset --inverted args for equality constraint
103+ incDepSet nam a b = AddInclusionDependency nam (InclusionDependency a b)
102104 case op of
103105 SubsetOp -> pure subsetA
104106 EqualityOp -> pure (MultipleExpr [subsetA, subsetB])
@@ -106,8 +108,7 @@ addConstraintP = do
106108deleteConstraintP :: Parser DatabaseContextExpr
107109deleteConstraintP = do
108110 reserved "deleteconstraint"
109− constraintName <- identifier
110− return $ RemoveInclusionDependency (T.pack constraintName)
111+ RemoveInclusionDependency <$> identifier
111112
112113-- key <constraint name> {<uniqueness attributes>} <uniqueness relexpr>
113114keyP :: Parser DatabaseContextExpr
@@ -117,28 +118,42 @@ keyP = do
117118 uniquenessAttrNames <- braces attributeListP
118119 uniquenessExpr <- relExprP
119120 let newIncDep = inclusionDependencyForKey uniquenessAttrNames uniquenessExpr
120− return $ AddInclusionDependency (T.pack keyName) newIncDep
121+ pure $ AddInclusionDependency keyName newIncDep
122+
123+funcDepP :: Parser DatabaseContextExpr
124+funcDepP = do
125+ reserved "funcdep"
126+ keyName <- identifier
127+ source <- parens attributeListP
128+ reserved "->"
129+ dependents <- parens attributeListP
130+ expr <- relExprP
131+ let newIncDeps = inclusionDependenciesForFunctionalDependency funcDep
132+ funcDep = FunctionalDependency source dependents expr
133+ nameA = keyName <> "_A"
134+ nameB = keyName <> "_B"
135+ pure (MultipleExpr [AddInclusionDependency nameA (fst newIncDeps),
136+ AddInclusionDependency nameB (snd newIncDeps)])
121137
122−attributeAssignmentP :: Parser (String, AtomExpr)
138+attributeAssignmentP :: Parser (AttributeName, AtomExpr)
123139attributeAssignmentP = do
124140 attrName <- identifier
125141 reservedOp ":="
126142 atomExpr <- atomExprP
127− return $ (attrName, atomExpr)
143+ pure (attrName, atomExpr)
128144
129145addNotificationP :: Parser DatabaseContextExpr
130146addNotificationP = do
131147 reserved "notify"
132148 notName <- identifier
133149 triggerExpr <- relExprP
134− resultExpr <- relExprP
135− return $ AddNotification (T.pack notName) triggerExpr resultExpr
150+ resultOldExpr <- relExprP
151+ AddNotification notName triggerExpr resultOldExpr <$> relExprP
136152
137153removeNotificationP :: Parser DatabaseContextExpr
138154removeNotificationP = do
139155 reserved "unnotify"
140− notName <- identifier
141− return $ RemoveNotification (T.pack notName)
156+ RemoveNotification <$> identifier
142157
143158-- | data Hair = Bald | Color Text
144159addTypeConstructorP :: Parser DatabaseContextExpr
@@ -152,28 +167,47 @@ addTypeConstructorP = do
152167removeTypeConstructorP :: Parser DatabaseContextExpr
153168removeTypeConstructorP = do
154169 reserved "undata"
155− RemoveTypeConstructor <$> liftM T.pack identifier
170+ RemoveTypeConstructor <$> typeConstructorNameP
156171
157172removeAtomFunctionP :: Parser DatabaseContextExpr
158173removeAtomFunctionP = do
159174 reserved "removeatomfunction"
160− RemoveAtomFunction <$> liftM T.pack quotedString
161−
175+ RemoveAtomFunction <$> quotedString
176+
177+removeDatabaseContextFunctionP :: Parser DatabaseContextExpr
178+removeDatabaseContextFunctionP = do
179+ reserved "removedatabasecontextfunction"
180+ RemoveDatabaseContextFunction <$> quotedString
181+
182+functionNameP :: Parser AtomFunctionName
183+functionNameP = uncapitalizedIdentifier
184+
185+executeDatabaseContextFunctionP :: Parser DatabaseContextExpr
186+executeDatabaseContextFunctionP = do
187+ reserved "execute"
188+ funcName <- functionNameP
189+ args <- parens (sepBy atomExprP comma)
190+ pure (ExecuteDatabaseContextFunction funcName args)
191+
162192databaseExprOpP :: Parser DatabaseContextExpr
163193databaseExprOpP = multipleDatabaseContextExprP
164194
195+{-
165196evalDatabaseContextExpr :: Bool -> DatabaseContext -> DatabaseContextExpr -> Either RelationalError DatabaseContext
166197evalDatabaseContextExpr useOptimizer context expr = do
167− optimizedExpr <- evalState (applyStaticDatabaseOptimization expr) context
168− case runState (evalContextExpr (if useOptimizer then optimizedExpr else expr)) context of
169− (Nothing, context') -> Right context'
170− (Just err, _) -> Left err
171−
198+ optimizedExpr <- evalState (applyStaticDatabaseOptimization expr) (RE.freshDatabaseState context)
199+ case runState (RE.evalDatabaseContextExpr (if useOptimizer then optimizedExpr else expr)) (RE.freshDatabaseState context) of
200+ (Right (), (context',_, _)) -> Right context'
201+ (Left err, _) -> Left err
202+-}
172203
173−interpretDatabaseContextExpr :: DatabaseContext -> String -> Either RelationalError DatabaseContext
174−interpretDatabaseContextExpr context tutdstring = case parse databaseExprOpP "" tutdstring of
175− Left err -> Left $ ParseError (T.pack (show err))
176− Right parsed -> evalDatabaseContextExpr True context parsed
204+interpretDatabaseContextExpr :: DatabaseContext -> TransactionId -> TransactionGraph -> T.Text -> Either RelationalError DatabaseContext
205+interpretDatabaseContextExpr context transId graph tutdstring =
206+ case parse databaseExprOpP "" tutdstring of
207+ Left err -> Left $ PM36E.ParseError (T.pack (show err))
208+ Right parsed -> do
209+ let env = RE.mkDatabaseContextEvalEnv transId graph
210+ RE.dbc_context <$> RE.runDatabaseContextEvalMonad context env (optimizeAndEvalDatabaseContextExpr True parsed)
177211
178212{-
179213--no optimization
src/bin/TutorialD/Interpreter/DatabaseContextIOOperator.hs+38−33
@@ -1,45 +1,50 @@
11--compiling the script requires the IO monad because it must load modules from the filesystem, so we create the function and generate the requisite DatabaseExpr here.
22module TutorialD.Interpreter.DatabaseContextIOOperator where
33import ProjectM36.Base
4−
54import TutorialD.Interpreter.Base
65import TutorialD.Interpreter.Types
7−import Text.Parsec
8−import Text.Parsec.String
96import Data.Text
10−import Control.Monad
117
128addAtomFunctionExprP :: Parser DatabaseContextIOExpr
13−addAtomFunctionExprP = do
14− reserved "addatomfunction"
15− funcName <- liftM pack quotedString
16− funcType <- atomTypeSignatureP
17− funcScript <- liftM pack quotedString
18− pure $ AddAtomFunction funcName funcType funcScript
9+addAtomFunctionExprP = dbioexprP "addatomfunction" AddAtomFunction
10+
11+addDatabaseContextFunctionExprP :: Parser DatabaseContextIOExpr
12+addDatabaseContextFunctionExprP = dbioexprP "adddatabasecontextfunction" AddDatabaseContextFunction
13+
14+createArbitraryRelationP :: Parser DatabaseContextIOExpr
15+createArbitraryRelationP = do
16+ reserved "createarbitraryrelation"
17+ relVarName <- identifier
18+ attrExprs <- makeAttributeExprsP :: Parser [AttributeExpr]
19+ min' <- fromInteger <$> integer
20+ _ <- symbol "-"
21+ max' <- fromInteger <$> integer
22+ pure $ CreateArbitraryRelation relVarName attrExprs (min',max')
1923
24+dbioexprP :: ParseStr -> (Text -> [TypeConstructor] -> Text -> DatabaseContextIOExpr) -> Parser DatabaseContextIOExpr
25+dbioexprP res adt = do
26+ reserved res
27+ funcName <- quotedString
28+ funcType <- atomTypeSignatureP
29+ adt funcName funcType <$> quotedString
30+
2031atomTypeSignatureP :: Parser [TypeConstructor]
2132atomTypeSignatureP = sepBy typeConstructorP arrow
2233
23−{-
24−evalDatabaseContextIOOp :: HscEnv -> DatabaseContext -> DatabaseContextIOExpr -> IO (Either RelationalError DatabaseContextIOExpr)
25−evalDatabaseContextIOOp env context addfunc@(AddAtomFunction _ _ _) = do
26− evalDatabaseContextIOExpr context
27− result <- runGhc (Just libdir) $ do
28− setSession env
29− ret <- typeCheckAtomFunctionScript script
30− case ret of
31− Just err -> pure (Left err)
32− Nothing -> do
33− eBody <- compileAtomFunctionScript script
34− case eBody of
35− Left err -> pure (Left err)
36− Right func -> let atomFunc = AtomFunction {
37− atomFuncName = funcName,
38− atomFuncType = funcType,
39− atomFuncBody = AtomFunctionBody (Just script) func } in
40− --actually add the func
41− pure $ Right context
42− case result of
43− Left err -> Left (AtomFunctionBodyScriptError err)
44− Right context -> pure (Right context)
45−-}
34+dbContextIOExprP :: Parser DatabaseContextIOExpr
35+dbContextIOExprP = addAtomFunctionExprP <|>
36+ addDatabaseContextFunctionExprP <|>
37+ loadAtomFunctionsP <|>
38+ loadDatabaseContextFunctionsP <|>
39+ createArbitraryRelationP
40+
41+loadAtomFunctionsP :: Parser DatabaseContextIOExpr
42+loadAtomFunctionsP = do
43+ reserved "loadatomfunctions"
44+ LoadAtomFunctions <$> quotedString <*> quotedString <*> fmap unpack quotedString
45+
46+loadDatabaseContextFunctionsP :: Parser DatabaseContextIOExpr
47+loadDatabaseContextFunctionsP = do
48+ reserved "loaddatabasecontextfunctions"
49+ LoadDatabaseContextFunctions <$> quotedString <*> quotedString <*> fmap unpack quotedString
50+
src/bin/TutorialD/Interpreter/Export/Base.hs+8−1
@@ -1,9 +1,16 @@
1+{-# LANGUAGE CPP #-}
12module TutorialD.Interpreter.Export.Base where
23import ProjectM36.Base
34import ProjectM36.Error
5+#if __GLASGOW_HASKELL__ < 804
6+import Data.Monoid
7+#endif
48
59data RelVarDataExportOperator = RelVarDataExportOperator RelationalExpr FilePath (RelVarDataExportOperator -> Relation -> IO (Maybe RelationalError))
610
11+instance Show RelVarDataExportOperator where
12+ show (RelVarDataExportOperator expr path _) = "RelVarDataExportOperator " <> show expr <> " " <> path
13+
714evalRelVarDataExportOperator :: RelVarDataExportOperator -> Relation -> IO (Maybe RelationalError)
8−evalRelVarDataExportOperator op@(RelVarDataExportOperator _ _ exportFunc) rel = exportFunc op rel
15+evalRelVarDataExportOperator op@(RelVarDataExportOperator _ _ exportFunc) = exportFunc op
916
src/bin/TutorialD/Interpreter/Export/CSV.hs+3−4
@@ -2,10 +2,9 @@ module TutorialD.Interpreter.Export.CSV where
22import ProjectM36.Relation.Show.CSV
33import TutorialD.Interpreter.Export.Base
44import TutorialD.Interpreter.RelationalExpr
5−import TutorialD.Interpreter.Base
5+import TutorialD.Interpreter.Base hiding (try)
66import ProjectM36.Base
77import ProjectM36.Error
8−import Text.Parsec.String
98import qualified Data.ByteString.Lazy as BS
109import Control.Exception (try)
1110import qualified Data.Text as T
@@ -15,10 +14,10 @@ exportCSVP = do
1514 reserved ":exportcsv"
1615 exportExpr <- relExprP
1716 path <- quotedString
18− return $ RelVarDataExportOperator exportExpr path exportRelationCSV
17+ return $ RelVarDataExportOperator exportExpr (T.unpack path) exportRelationCSV
1918
2019exportRelationCSV :: RelVarDataExportOperator -> Relation -> IO (Maybe RelationalError)
21−exportRelationCSV (RelVarDataExportOperator _ pathOut _) rel = do
20+exportRelationCSV (RelVarDataExportOperator _ pathOut _) rel =
2221 case relationAsCSV rel of
2322 Left err -> return $ Just err
2423 Right csvData -> do
src/bin/TutorialD/Interpreter/Import/Base.hs+20−5
@@ -1,17 +1,32 @@
1+{-# LANGUAGE CPP #-}
12module TutorialD.Interpreter.Import.Base where
23import ProjectM36.Base
34import ProjectM36.Error
5+import Text.URI (URI)
6+import Data.Text (Text)
7+#if __GLASGOW_HASKELL__ < 804
8+import Data.Monoid
9+#endif
410
511-- | import data into a relation variable
6−data RelVarDataImportOperator = RelVarDataImportOperator RelVarName FilePath (RelVarName -> Attributes -> FilePath -> IO (Either RelationalError DatabaseContextExpr))
12+data RelVarDataImportOperator = RelVarDataImportOperator RelVarName FilePath (RelVarName -> TypeConstructorMapping -> Attributes -> FilePath -> IO (Either RelationalError DatabaseContextExpr))
13+
14+instance Show RelVarDataImportOperator where
15+ show (RelVarDataImportOperator rv path _) = "RelVarDataImportOperator " <> show rv <> " " <> path
16+
17+type HashVerification = Maybe Text
718
819-- | import data into a database context
9−data DatabaseContextDataImportOperator = DatabaseContextDataImportOperator FilePath (FilePath -> IO (Either RelationalError DatabaseContextExpr))
20+data DatabaseContextDataImportOperator = DatabaseContextDataImportOperator URI HashVerification (URI -> HashVerification -> IO (Either RelationalError DatabaseContextExpr))
21+
22+instance Show DatabaseContextDataImportOperator where
23+ show (DatabaseContextDataImportOperator uri hash _) =
24+ "DatabaseContextDataImportOperator " <> show uri <> " " <> show hash
1025
1126-- perhaps create a structure to import a whole transaction graph section in the future
1227
13−evalRelVarDataImportOperator :: RelVarDataImportOperator -> Attributes -> IO (Either RelationalError DatabaseContextExpr)
14−evalRelVarDataImportOperator (RelVarDataImportOperator relVarName path importFunc) attrs = importFunc relVarName attrs path
28+evalRelVarDataImportOperator :: RelVarDataImportOperator -> TypeConstructorMapping -> Attributes -> IO (Either RelationalError DatabaseContextExpr)
29+evalRelVarDataImportOperator (RelVarDataImportOperator relVarName path importFunc) tConsMap attrs = importFunc relVarName tConsMap attrs path
1530
1631evalDatabaseContextDataImportOperator :: DatabaseContextDataImportOperator -> IO (Either RelationalError DatabaseContextExpr)
17−evalDatabaseContextDataImportOperator (DatabaseContextDataImportOperator path importFunc) = importFunc path
32+evalDatabaseContextDataImportOperator (DatabaseContextDataImportOperator uri hash importFunc) = importFunc uri hash
src/bin/TutorialD/Interpreter/Import/BasicExamples.hs+8−3
@@ -1,12 +1,17 @@
1+{-# LANGUAGE CPP #-}
12--includes some hardcoded examples which can be imported even during safe evaluation (no file I/O)
23module TutorialD.Interpreter.Import.BasicExamples where
34import ProjectM36.DateExamples
45import ProjectM36.Base
56import ProjectM36.DatabaseContext
67import TutorialD.Interpreter.Base
7−import Text.Parsec.String
8+
9+#if !MIN_VERSION_megaparsec(6,0,0)
10+import Text.Megaparsec.Text
11+#endif
812
913data ImportBasicExampleOperator = ImportBasicDateExampleOperator
14+ deriving (Show)
1015
1116evalImportBasicExampleOperator :: ImportBasicExampleOperator -> DatabaseContextExpr
1217evalImportBasicExampleOperator ImportBasicDateExampleOperator = databaseContextAsDatabaseContextExpr dateExamples
@@ -15,8 +20,8 @@ importBasicExampleOperatorP :: Parser ImportBasicExampleOperator
1520importBasicExampleOperatorP = do
1621 reservedOp ":importexample"
1722 example <- identifier
18− if example == "date" then
23+ if example == "cjdate" then
1924 pure ImportBasicDateExampleOperator
2025 else
2126 fail "Unknown example name"
22−
27+
src/bin/TutorialD/Interpreter/Import/CSV.hs+11−11
@@ -1,29 +1,29 @@
1+{-# LANGUAGE CPP #-}
12module TutorialD.Interpreter.Import.CSV where
23import TutorialD.Interpreter.Import.Base
34import ProjectM36.Base
45import ProjectM36.Error
5−import ProjectM36.Relation.Parse.CSV
6+import ProjectM36.Relation.Parse.CSV hiding (quotedString)
67import qualified Data.ByteString.Lazy as BS
78import qualified Data.Text as T
8−import Text.Parsec.String
9−import TutorialD.Interpreter.Base
9+import TutorialD.Interpreter.Base hiding (try)
1010import Control.Exception
1111
12−importCSVRelation :: RelVarName -> Attributes -> FilePath -> IO (Either RelationalError DatabaseContextExpr)
13−importCSVRelation relVarName attrs pathIn = do
12+importCSVRelation :: RelVarName -> TypeConstructorMapping -> Attributes -> FilePath -> IO (Either RelationalError DatabaseContextExpr)
13+importCSVRelation relVarName tConsMap attrs pathIn = do
1414 --TODO: handle filesystem errors
1515 csvData <- try (BS.readFile pathIn) :: IO (Either IOError BS.ByteString)
1616 case csvData of
17− Left err -> return $ Left (ImportError $ T.pack (show err))
18− Right csvData' -> case csvAsRelation csvData' attrs of
19− Left err -> return $ Left (ParseError $ T.pack (show err))
20− Right csvRel -> return $ Right (Insert relVarName (ExistingRelation csvRel))
17+ Left err -> pure $ Left (ImportError (ImportFileError (T.pack (show err))))
18+ Right csvData' -> case csvAsRelation attrs tConsMap csvData' of
19+ Left err -> pure $ Left (ParseError $ T.pack (show err))
20+ Right csvRel -> pure $ Right (Insert relVarName (ExistingRelation csvRel))
2121
2222importCSVP :: Parser RelVarDataImportOperator
2323importCSVP = do
2424 reserved ":importcsv"
2525 path <- quotedString
26− whiteSpace
26+ spaceConsumer
2727 relVarName <- identifier
28− return $ RelVarDataImportOperator (T.pack relVarName) path importCSVRelation
28+ return $ RelVarDataImportOperator relVarName (T.unpack path) importCSVRelation
2929
src/bin/TutorialD/Interpreter/Import/TutorialD.hs+74−19
@@ -1,31 +1,86 @@
11module TutorialD.Interpreter.Import.TutorialD where
22import ProjectM36.Base
33import TutorialD.Interpreter.Import.Base
4−import TutorialD.Interpreter.Base
4+import TutorialD.Interpreter.Base hiding (try)
55import TutorialD.Interpreter.DatabaseContextExpr
6−import Text.Parsec.String
7−import Text.Parsec hiding (try)
86import ProjectM36.Error
9−import Data.Either
7+import qualified ProjectM36.Error as PM36E
108import qualified Data.Text as T
119import Control.Exception
12−--import a file containing TutorialD database context expressions
10+import qualified Data.ByteString as BS
11+import qualified Data.Text.Encoding as TE
12+import qualified Text.URI as URI
13+import Text.URI (URI)
14+import Crypto.Hash.SHA256
15+import Data.ByteString.Base16 as B16
16+import Network.HTTP.Simple
17+import Network.HTTP.Types
18+--import a file containing TutorialD database context expressions via local files or HTTP/HTTPS
1319
14−importTutorialD :: FilePath -> IO (Either RelationalError DatabaseContextExpr)
15−importTutorialD pathIn = do
16− tutdData <- try (readFile pathIn) :: IO (Either IOError String)
17− case tutdData of
18− Left err -> return $ Left (ImportError $ T.pack (show err))
19− Right tutdData' -> do
20− let dbexprsErr = map (parse databaseExprP "import") (lines tutdData')
21− errs = lefts dbexprsErr
22− case errs of
23− err2:_ -> return $ Left (ParseError (T.pack (show err2)))
24− [] -> return $ Right (MultipleExpr (rights dbexprsErr))
20+importTutorialDFromFile :: URI -> HashVerification -> IO (Either RelationalError DatabaseContextExpr)
21+importTutorialDFromFile fileURI mHash = do
22+ case URI.uriPath fileURI of
23+ Just (False, _) -> do
24+ eTutdBytes <- try (BS.readFile filePath) :: IO (Either IOError BS.ByteString)
25+ case eTutdBytes of
26+ Left err -> pure $ Left (ImportError (ImportFileError (T.pack (show err))))
27+ Right tutdBytes ->
28+ case validateBytes tutdBytes mHash of
29+ Left err -> pure (Left err)
30+ Right tutdBytes' -> importTutorialDBytes tutdBytes'
31+ _ -> pure (Left (ImportError (InvalidFileURIError (URI.render fileURI))))
32+ where
33+ filePath = drop (length ("file://" :: String)) (URI.renderStr fileURI)
34+
2535
36+importTutorialDBytes :: BS.ByteString -> IO (Either RelationalError DatabaseContextExpr)
37+importTutorialDBytes tutdBytes =
38+ case TE.decodeUtf8' tutdBytes of
39+ Left err -> pure (Left (ImportError (ImportFileDecodeError (T.pack (show err)))))
40+ Right tutdUtf8 ->
41+ case parse (multipleDatabaseContextExprP <* eof) "import" tutdUtf8 of
42+ --parseErrorPretty is new in megaparsec 5
43+ Left err -> pure (Left (PM36E.ParseError (T.pack (errorBundlePretty err))))
44+ Right expr -> pure (Right expr)
45+
46+importTutorialDViaHTTP :: URI -> HashVerification -> IO (Either RelationalError DatabaseContextExpr)
47+importTutorialDViaHTTP uri mHash = do
48+ reqURI <- parseRequest (URI.renderStr uri)
49+ response <- httpBS reqURI
50+ let scode = getResponseStatus response
51+ if scode == ok200 then
52+ let byteBody = getResponseBody response in
53+ case validateBytes byteBody mHash of
54+ Right byteBody' -> do
55+ importTutorialDBytes byteBody'
56+ Left err -> pure (Left err)
57+ else
58+ pure (Left (ImportError (ImportDownloadError (T.pack ("download failed: " <> show scode)))))
59+
60+validateBytes :: BS.ByteString -> HashVerification -> Either RelationalError BS.ByteString
61+validateBytes tutdBytes mHash =
62+ case mHash of
63+ Nothing -> pure tutdBytes
64+ Just expectedHashText ->
65+ case B16.decode (TE.encodeUtf8 expectedHashText) of
66+ Left _ -> Left (ImportError (InvalidSHA256Error expectedHashText))
67+ Right expectedHash | hashBytes == expectedHash -> pure tutdBytes
68+ | otherwise ->
69+ let p = TE.decodeUtf8 . B16.encode in
70+ Left (ImportError (SHA256MismatchError (p expectedHash) (p hashBytes)))
71+ where
72+ hashBytes = hash tutdBytes
73+
74+
2675tutdImportP :: Parser DatabaseContextDataImportOperator
2776tutdImportP = do
2877 reserved ":importtutd"
29− path <- quotedString
30− whiteSpace
31− return $ DatabaseContextDataImportOperator path importTutorialD
78+ uri <- quoted URI.parser
79+ spaceConsumer
80+ mhash <- optional (quoted hex)
81+ handler <- case URI.unRText <$> URI.uriScheme uri of
82+ Nothing -> fail "URI scheme missing"
83+ Just "file" -> pure importTutorialDFromFile
84+ Just scheme | scheme `elem` ["http", "https"] -> pure importTutorialDViaHTTP
85+ | otherwise -> fail ( "unsupported URI scheme: " <> show scheme)
86+ pure $ DatabaseContextDataImportOperator uri mhash handler
src/bin/TutorialD/Interpreter/InformationOperator.hs+8−3
@@ -1,14 +1,19 @@
11{-# LANGUAGE CPP #-}
22module TutorialD.Interpreter.InformationOperator where
33import Data.Text
4−import Text.Parsec
5−import Text.Parsec.String
4+import Text.Megaparsec
65import TutorialD.Interpreter.Base
6+-- older versions of stack fail to
7+#if !defined(VERSION_project_m36)
8+# warning Failed to discover proper version from cabal_macros.h
9+# define VERSION_project_m36 "<unknown>"
10+#endif
711
812-- this module provides information about the current interpreter
913
1014data InformationOperator = HelpOperator |
1115 GetVersionOperator
16+ deriving (Show)
1217
1318infoOpP :: Parser InformationOperator
1419infoOpP = helpOpP <|> getVersionP
@@ -20,7 +25,7 @@ getVersionP :: Parser InformationOperator
2025getVersionP = reserved ":version" >> pure GetVersionOperator
2126
2227evalInformationOperator :: InformationOperator -> Either Text Text
23−evalInformationOperator GetVersionOperator = Right ("tutd " `append` PROJECTM36_VERSION)
28+evalInformationOperator GetVersionOperator = Right ("tutd " `append` VERSION_project_m36)
2429-- display generic help
2530evalInformationOperator HelpOperator = Right $ intercalate "\n" help
2631 where
src/bin/TutorialD/Interpreter/RODatabaseContextOperator.hs+107−33
@@ -1,12 +1,16 @@
11{-# LANGUAGE GADTs #-}
22module TutorialD.Interpreter.RODatabaseContextOperator where
33import ProjectM36.Base
4+import ProjectM36.Relation
5+import qualified ProjectM36.DataFrame as DF
6+import ProjectM36.Error
7+import ProjectM36.Tuple
8+import ProjectM36.InclusionDependency
49import qualified ProjectM36.Client as C
5−import Text.Parsec
6−import Text.Parsec.String
710import TutorialD.Interpreter.Base
811import TutorialD.Interpreter.RelationalExpr
912import TutorialD.Interpreter.DatabaseContextExpr
13+import TutorialD.Printer
1014import Control.Monad.State
1115import qualified Data.Text as T
1216import ProjectM36.Relation.Show.Gnuplot
@@ -18,53 +22,57 @@ data RODatabaseContextOperator where
1822 ShowRelation :: RelationalExpr -> RODatabaseContextOperator
1923 PlotRelation :: RelationalExpr -> RODatabaseContextOperator
2024 ShowRelationType :: RelationalExpr -> RODatabaseContextOperator
21− ShowConstraint :: StringType -> RODatabaseContextOperator
25+ ShowConstraints :: StringType -> RODatabaseContextOperator
2226 ShowPlan :: DatabaseContextExpr -> RODatabaseContextOperator
2327 ShowTypes :: RODatabaseContextOperator
2428 ShowRelationVariables :: RODatabaseContextOperator
29+ ShowAtomFunctions :: RODatabaseContextOperator
30+ ShowDatabaseContextFunctions :: RODatabaseContextOperator
31+ ShowDataFrame :: DF.DataFrameExpr -> RODatabaseContextOperator
2532 Quit :: RODatabaseContextOperator
2633 deriving (Show)
2734
2835typeP :: Parser RODatabaseContextOperator
2936typeP = do
30− reservedOp ":type"
31− expr <- relExprP
32− return $ ShowRelationType expr
37+ colonOp ":type"
38+ ShowRelationType <$> relExprP
3339
3440showRelP :: Parser RODatabaseContextOperator
3541showRelP = do
36− reservedOp ":showexpr"
37− expr <- relExprP
38− return $ ShowRelation expr
42+ colonOp ":showexpr"
43+ ShowRelation <$> relExprP
3944
4045showPlanP :: Parser RODatabaseContextOperator
4146showPlanP = do
42− reservedOp ":showplan"
43− expr <- databaseExprP
44− return $ ShowPlan expr
47+ colonOp ":showplan"
48+ ShowPlan <$> databaseContextExprP
4549
4650showTypesP :: Parser RODatabaseContextOperator
47−showTypesP = reserved ":showtypes" >> pure ShowTypes
51+showTypesP = colonOp ":showtypes" >> pure ShowTypes
4852
4953showRelationVariables :: Parser RODatabaseContextOperator
50−showRelationVariables = reserved ":showrelvars" >> pure ShowRelationVariables
54+showRelationVariables = colonOp ":showrelvars" >> pure ShowRelationVariables
55+
56+showAtomFunctionsP :: Parser RODatabaseContextOperator
57+showAtomFunctionsP = colonOp ":showatomfunctions" >> pure ShowAtomFunctions
58+
59+showDatabaseContextFunctionsP :: Parser RODatabaseContextOperator
60+showDatabaseContextFunctionsP = colonOp ":showdatabasecontextfunctions" >> pure ShowDatabaseContextFunctions
5161
5262quitP :: Parser RODatabaseContextOperator
5363quitP = do
54− reservedOp ":quit"
64+ colonOp ":quit"
5565 return Quit
5666
5767showConstraintsP :: Parser RODatabaseContextOperator
5868showConstraintsP = do
59− reservedOp ":constraints"
60− constraintName <- option "" identifier
61− return $ ShowConstraint (T.pack constraintName)
69+ colonOp ":constraints"
70+ ShowConstraints <$> option "" identifier
6271
6372plotRelExprP :: Parser RODatabaseContextOperator
6473plotRelExprP = do
65− reserved ":plotexpr"
66− expr <- relExprP
67− return $ PlotRelation expr
74+ colonOp ":plotexpr"
75+ PlotRelation <$> relExprP
6876
6977roDatabaseContextOperatorP :: Parser RODatabaseContextOperator
7078roDatabaseContextOperatorP = typeP
@@ -74,6 +82,9 @@ roDatabaseContextOperatorP = typeP
7482 <|> showConstraintsP
7583 <|> showPlanP
7684 <|> showTypesP
85+ <|> showAtomFunctionsP
86+ <|> showDatabaseContextFunctionsP
87+ <|> showDataFrameP
7788 <|> quitP
7889
7990--logically, these read-only operations could happen purely, but not if a remote call is required
@@ -96,17 +107,21 @@ evalRODatabaseContextOp sessionId conn (PlotRelation expr) = do
96107 Left err -> DisplayErrorResult $ T.pack (show err)
97108 Right rel -> DisplayIOResult $ do
98109 err <- plotRelation rel
99− when (isJust err) $ putStrLn (show err)
110+ when (isJust err) $ print err
100111
101−evalRODatabaseContextOp sessionId conn (ShowConstraint name) = do
112+evalRODatabaseContextOp sessionId conn (ShowConstraints name) = do
102113 eIncDeps <- C.inclusionDependencies sessionId conn
103− pure $ case eIncDeps of
104− Left err -> DisplayErrorResult $ T.pack (show err)
105− Right incDeps -> case name of
106− "" -> DisplayResult $ T.pack (show incDeps)
107− depName -> case M.lookup depName incDeps of
108− Nothing -> DisplayErrorResult "No such constraint."
109− Just dep -> DisplayResult $ T.pack (show dep)
114+ let val = case eIncDeps of
115+ Left err -> Left err
116+ Right incDeps -> case name of
117+ "" -> inclusionDependenciesAsRelation incDeps >>= renderRelExprsInIncDeps
118+ depName -> case M.lookup depName incDeps of
119+ Nothing -> Left (InclusionDependencyNameNotInUseError depName)
120+ Just dep ->
121+ inclusionDependenciesAsRelation (M.singleton depName dep) >>= renderRelExprsInIncDeps
122+ pure $ case val of
123+ Left err -> DisplayErrorResult (T.pack (show err))
124+ Right rel -> DisplayRelationResult rel
110125
111126evalRODatabaseContextOp sessionId conn (ShowPlan dbExpr) = do
112127 plan <- C.planForDatabaseContextExpr sessionId conn dbExpr
@@ -125,12 +140,71 @@ evalRODatabaseContextOp sessionId conn ShowRelationVariables = do
125140 case eRel of
126141 Left err -> pure $ DisplayErrorResult (T.pack (show err))
127142 Right rel -> evalRODatabaseContextOp sessionId conn (ShowRelation (ExistingRelation rel))
143+
144+evalRODatabaseContextOp sessionId conn ShowAtomFunctions = do
145+ eRel <- C.atomFunctionsAsRelation sessionId conn
146+ case eRel of
147+ Left err -> pure $ DisplayErrorResult (T.pack (show err))
148+ Right rel -> evalRODatabaseContextOp sessionId conn (ShowRelation (ExistingRelation rel))
149+
150+evalRODatabaseContextOp sessionId conn ShowDatabaseContextFunctions = do
151+ eRel <- C.databaseContextFunctionsAsRelation sessionId conn
152+ case eRel of
153+ Left err -> pure $ DisplayErrorResult (T.pack (show err))
154+ Right rel -> evalRODatabaseContextOp sessionId conn (ShowRelation (ExistingRelation rel))
128155
129−evalRODatabaseContextOp _ _ (Quit) = pure QuitResult
156+evalRODatabaseContextOp sessionId conn (ShowDataFrame dfExpr) = do
157+ eDataFrame <- C.executeDataFrameExpr sessionId conn dfExpr
158+ case eDataFrame of
159+ Left err -> pure (DisplayErrorResult (T.pack (show err)))
160+ Right dframe -> pure (DisplayDataFrameResult dframe)
161+
162+evalRODatabaseContextOp _ _ Quit = pure QuitResult
130163
131−interpretRODatabaseContextOp :: C.SessionId -> C.Connection -> String -> IO TutorialDOperatorResult
164+interpretRODatabaseContextOp :: C.SessionId -> C.Connection -> T.Text -> IO TutorialDOperatorResult
132165interpretRODatabaseContextOp sessionId conn tutdstring = case parse roDatabaseContextOperatorP "" tutdstring of
133166 Left err -> pure $ DisplayErrorResult (T.pack (show err))
134167 Right parsed -> evalRODatabaseContextOp sessionId conn parsed
135168
136−
169+showDataFrameP :: Parser RODatabaseContextOperator
170+showDataFrameP = do
171+ colonOp ":showdataframe"
172+ relExpr <- relExprP
173+ reservedOp "orderby"
174+ attrOrdersExpr <- attrOrdersExprP
175+ mbOffset <- optional offsetP
176+ mbLimit <- optional limitP
177+ pure $ ShowDataFrame (DF.DataFrameExpr relExpr attrOrdersExpr mbOffset mbLimit)
178+
179+
180+offsetP :: Parser Integer
181+offsetP = do
182+ reservedOp "offset"
183+ natural
184+
185+limitP :: Parser Integer
186+limitP = do
187+ reservedOp "limit"
188+ natural
189+
190+attrOrdersExprP :: Parser [DF.AttributeOrderExpr]
191+attrOrdersExprP = braces (sepBy attrOrderExprP comma)
192+
193+attrOrderExprP :: Parser DF.AttributeOrderExpr
194+attrOrderExprP = DF.AttributeOrderExpr <$> identifier <*> orderP
195+
196+orderP :: Parser DF.Order
197+orderP = try (reservedOp "ascending" >> pure DF.AscendingOrder) <|> try (reservedOp "descending" >> pure DF.DescendingOrder) <|> pure DF.AscendingOrder
198+
199+-- render RelationalExprAtoms as TutorialD
200+renderRelExprsInIncDeps :: Relation -> Either RelationalError Relation
201+renderRelExprsInIncDeps = relMogrify tupMapper attrs
202+ where
203+ tupMapper tup = pure $ mkRelationTupleFromMap (M.map mapper (tupleToMap tup))
204+ mapper (RelationalExprAtom expr) = TextAtom (T.pack (show (prettyRelationalExpr expr)))
205+ mapper atom = atom
206+ attrs = C.attributesFromList [Attribute "name" TextAtomType,
207+ Attribute "sub" TextAtomType,
208+ Attribute "super" TextAtomType
209+ ]
210+
src/bin/TutorialD/Interpreter/RelationalExpr.hs+170−131
@@ -1,245 +1,284 @@
1+{-# LANGUAGE CPP #-}
12module TutorialD.Interpreter.RelationalExpr where
2−import Text.Parsec
3−import Text.Parsec.Expr
3+import Text.Megaparsec
4+#if MIN_VERSION_megaparsec(7,0,0)
5+import Control.Monad.Combinators.Expr
6+#else
7+import Text.Megaparsec.Expr
8+#endif
49import ProjectM36.Base
5−import Text.Parsec.String
610import TutorialD.Interpreter.Base
711import TutorialD.Interpreter.Types
812import qualified Data.Text as T
913import qualified Data.Set as S
1014import qualified Data.Map as M
1115import Data.List (sort)
12−import Data.Functor.Identity (Identity)
13−import Control.Applicative (liftA)
1416import ProjectM36.MiscUtils
1517
1618--used in projection
17−attributeListP :: Parser AttributeNames
18−attributeListP = do
19− but <- try (string "all but " <* whiteSpace) <|> string ""
20− let constructor = if but == "" then AttributeNames else InvertedAttributeNames
21− attrs <- sepBy identifier comma
22− return $ constructor (S.fromList (map T.pack attrs))
23−
24−makeRelationP :: Parser RelationalExpr
19+attributeListP :: RelationalMarkerExpr a => Parser (AttributeNamesBase a)
20+attributeListP =
21+ (reservedOp "all but" >>
22+ InvertedAttributeNames . S.fromList <$> sepBy attributeNameP comma) <|>
23+
24+ (reservedOp "all from" >>
25+ RelationalExprAttributeNames <$> relExprP) <|>
26+
27+ (reservedOp "union of" >>
28+ UnionAttributeNames <$> braces attributeListP <*> braces attributeListP) <|>
29+
30+ (reservedOp "intersection of" >>
31+ IntersectAttributeNames <$> braces attributeListP <*> braces attributeListP) <|>
32+
33+ (AttributeNames . S.fromList <$> sepBy attributeNameP comma)
34+
35+
36+makeRelationP :: RelationalMarkerExpr a => Parser (RelationalExprBase a)
2537makeRelationP = do
2638 reserved "relation"
27− attrExprs <- try (liftA Just makeAttributeExprsP) <|> pure Nothing
39+ attrExprs <- try (fmap Just makeAttributeExprsP) <|> pure Nothing
2840 tupleExprs <- braces (sepBy tupleExprP comma) <|> pure []
29− pure $ MakeRelationFromExprs attrExprs tupleExprs
30−
31−--used in relation creation
32−makeAttributeExprsP :: Parser [AttributeExpr]
33−makeAttributeExprsP = braces (sepBy attributeAndTypeNameP comma)
34−
35−attributeAndTypeNameP :: Parser AttributeExpr
36−attributeAndTypeNameP = do
37− attrName <- identifier
38− --convert type name into type
39− typeCons <- typeConstructorP
40− return $ AttributeAndTypeNameExpr (T.pack attrName) typeCons
41−
41+ marker <- parseMarkerP
42+ pure $ MakeRelationFromExprs attrExprs (TupleExprs marker tupleExprs)
43+
44+
4245--abstract data type parser- in this context, the type constructor must not include any type arguments
4346--Either Text Int
4447adTypeConstructorP :: Parser TypeConstructor
4548adTypeConstructorP = do
46− tConsName <- capitalizedIdentifier
47− tConsArgs <- many typeConstructorArgP
48− pure $ ADTypeConstructor (T.pack tConsName) tConsArgs
49+ tConsName <- typeConstructorNameP
50+ tConsArgs <- many typeConstructorP
51+ pure $ ADTypeConstructor tConsName tConsArgs
4952
50−tupleExprP :: Parser TupleExpr
53+tupleExprP :: RelationalMarkerExpr a => Parser (TupleExprBase a)
5154tupleExprP = do
5255 reservedOp "tuple"
5356 attrAssocs <- braces (sepBy tupleAtomExprP comma)
5457 --detect duplicate attribute names
5558 let dupAttrNames = dupes (sort (map fst attrAssocs))
56− if length dupAttrNames /= 0 then
59+ if not (null dupAttrNames) then
5760 fail ("Attribute names duplicated: " ++ show dupAttrNames)
5861 else
5962 pure (TupleExpr (M.fromList attrAssocs))
6063
61−tupleAtomExprP :: Parser (AttributeName, AtomExpr)
64+tupleAtomExprP :: RelationalMarkerExpr a => Parser (AttributeName, AtomExprBase a)
6265tupleAtomExprP = do
63− attributeName <- identifier
66+ attributeName <- attributeNameP
6467 atomExpr <- atomExprP
65− return $ (T.pack attributeName, atomExpr)
66−
67−projectP :: Parser (RelationalExpr -> RelationalExpr)
68−projectP = do
69− attrs <- braces attributeListP
70− return $ Project attrs
68+ pure (attributeName, atomExpr)
69+
70+projectP :: RelationalMarkerExpr a => Parser (RelationalExprBase a -> RelationalExprBase a)
71+projectP = Project <$> braces attributeListP
7172
72−renameClauseP :: Parser (String, String)
73+renameClauseP :: Parser (T.Text, T.Text)
7374renameClauseP = do
74− oldAttr <- identifier
75+ oldAttr <- attributeNameP
7576 reservedOp "as"
76− newAttr <- identifier
77− return $ (oldAttr, newAttr)
77+ newAttr <- attributeNameP
78+ pure (oldAttr, newAttr)
7879
79−renameP :: Parser (RelationalExpr -> RelationalExpr)
80+renameP :: Parser (RelationalExprBase a -> RelationalExprBase a)
8081renameP = do
8182 reservedOp "rename"
82− (oldAttr, newAttr) <- braces renameClauseP
83− return $ Rename (T.pack oldAttr) (T.pack newAttr)
83+ renameList <- braces (sepBy renameClauseP comma)
84+ case renameList of
85+ [] -> pure (Restrict TruePredicate) --no-op when rename list is empty
86+ renames ->
87+ pure $ \expr -> foldl (\acc (oldAttr, newAttr) -> Rename oldAttr newAttr acc) expr renames
8488
85−whereClauseP :: Parser (RelationalExpr -> RelationalExpr)
86−whereClauseP = do
87− reservedOp "where"
88− boolExpr <- restrictionPredicateP
89− return $ Restrict boolExpr
89+whereClauseP :: RelationalMarkerExpr a => Parser (RelationalExprBase a -> RelationalExprBase a)
90+whereClauseP = reservedOp "where" *> (Restrict <$> restrictionPredicateP)
9091
91−groupClauseP :: Parser (AttributeNames, String)
92+groupClauseP :: RelationalMarkerExpr a => Parser (AttributeNamesBase a, T.Text)
9293groupClauseP = do
9394 attrs <- braces attributeListP
9495 reservedOp "as"
95− newAttrName <- identifier
96− return $ (attrs, newAttrName)
96+ newAttrName <- attributeNameP
97+ pure (attrs, newAttrName)
9798
98−groupP :: Parser (RelationalExpr -> RelationalExpr)
99+groupP :: RelationalMarkerExpr a => Parser (RelationalExprBase a -> RelationalExprBase a)
99100groupP = do
100101 reservedOp "group"
101102 (groupAttrList, groupAttrName) <- parens groupClauseP
102− return $ Group groupAttrList (T.pack groupAttrName)
103+ pure $ Group groupAttrList groupAttrName
103104
104105--in "Time and Relational Theory" (2014), Date's Tutorial D grammar for ungroup takes one attribute, while in previous books, it take multiple arguments. Let us assume that nested ungroups are the same as multiple attributes.
105−ungroupP :: Parser (RelationalExpr -> RelationalExpr)
106+ungroupP :: Parser (RelationalExprBase a -> RelationalExprBase a)
106107ungroupP = do
107108 reservedOp "ungroup"
108− rvaAttrName <- identifier
109− return $ Ungroup (T.pack rvaAttrName)
109+ Ungroup <$> attributeNameP
110110
111−extendP :: Parser (RelationalExpr -> RelationalExpr)
111+extendP :: RelationalMarkerExpr a => Parser (RelationalExprBase a -> RelationalExprBase a)
112112extendP = do
113113 reservedOp ":"
114− tupleExpr <- braces extendTupleExpressionP
115− return $ Extend tupleExpr
116−
117−relOperators :: [[Operator String () Identity RelationalExpr]]
114+ extends <- braces (sepBy extendTupleExpressionP comma)
115+ case extends of
116+ [] -> pure (Restrict TruePredicate)
117+ extends' ->
118+ pure $ \expr -> foldl (flip Extend) expr extends'
119+
120+semijoinP :: RelationalMarkerExpr a => Parser (RelationalExprBase a -> RelationalExprBase a -> RelationalExprBase a)
121+semijoinP = do
122+ reservedOp "semijoin" <|> reservedOp "matching"
123+ pure (\exprA exprB ->
124+ Project (RelationalExprAttributeNames exprA) (Join exprA exprB))
125+
126+antijoinP :: RelationalMarkerExpr a => Parser (RelationalExprBase a -> RelationalExprBase a -> RelationalExprBase a)
127+antijoinP = do
128+ reservedOp "not matching" <|> reservedOp "antijoin"
129+ pure (\exprA exprB ->
130+ Difference exprA (
131+ Project (RelationalExprAttributeNames exprA) (Join exprA exprB)))
132+
133+relOperators :: RelationalMarkerExpr a => [[Operator Parser (RelationalExprBase a)]]
118134relOperators = [
119135 [Postfix projectP],
120136 [Postfix renameP],
121137 [Postfix whereClauseP],
122138 [Postfix groupP],
123139 [Postfix ungroupP],
124− [Infix (reservedOp "join" >> return Join) AssocLeft],
125− [Infix (reservedOp "union" >> return Union) AssocLeft],
126− [Infix (reservedOp "minus" >> return Difference) AssocLeft],
127− [Infix (reservedOp "=" >> return Equals) AssocNone],
140+ [InfixL (reservedOp "join" >> return Join)],
141+ [InfixL semijoinP],
142+ [InfixL antijoinP],
143+ [InfixL (reservedOp "union" >> return Union)],
144+ [InfixL (reservedOp "minus" >> return Difference)],
145+ [InfixN (reservedOp "=" >> return Equals),
146+ InfixN (reservedOp "/=" >> return NotEquals)],
128147 [Postfix extendP]
129148 ]
130149
131−relExprP :: Parser RelationalExpr
132−relExprP = buildExpressionParser relOperators relTerm
150+relExprP :: RelationalMarkerExpr a => Parser (RelationalExprBase a)
151+relExprP = try withMacroExprP <|> makeExprParser relTerm relOperators
152+
153+--allow for additional characters
154+attributeNameP :: Parser AttributeName
155+attributeNameP = uncapitalizedIdentifier
156+
157+relVarNameP :: Parser RelVarName
158+relVarNameP = uncapitalizedIdentifier
133159
134−relVarP :: Parser RelationalExpr
135−relVarP = liftA (RelationVariable . T.pack) identifier
160+relVarP :: RelationalMarkerExpr a => Parser (RelationalExprBase a)
161+relVarP = RelationVariable <$> relVarNameP <*> parseMarkerP
136162
137−relTerm :: Parser RelationalExpr
163+relTerm :: RelationalMarkerExpr a => Parser (RelationalExprBase a)
138164relTerm = parens relExprP
139165 <|> makeRelationP
140166 <|> relVarP
141167
142−restrictionPredicateP :: Parser RestrictionPredicateExpr
143−restrictionPredicateP = buildExpressionParser predicateOperators predicateTerm
168+restrictionPredicateP :: RelationalMarkerExpr a => Parser (RestrictionPredicateExprBase a)
169+restrictionPredicateP = makeExprParser predicateTerm predicateOperators
144170 where
145171 predicateOperators = [
146172 [Prefix (reservedOp "not" >> return NotPredicate)],
147− [Infix (reservedOp "and" >> return AndPredicate) AssocLeft],
148− [Infix (reservedOp "or" >> return OrPredicate) AssocLeft]
173+ [InfixL (reservedOp "and" >> return AndPredicate)],
174+ [InfixL (reservedOp "or" >> return OrPredicate)]
149175 ]
150− predicateTerm = parens restrictionPredicateP
176+ predicateTerm = try (parens restrictionPredicateP)
151177 <|> try restrictionAtomExprP
152178 <|> try restrictionAttributeEqualityP
153− <|> try relationalBooleanExprP
179+ <|> relationalBooleanExprP
154180
181+relationalBooleanExprP :: RelationalMarkerExpr a => Parser (RestrictionPredicateExprBase a)
182+relationalBooleanExprP =
183+ --we can't actually detect if the type is relational boolean, so we just pass it to the next phase
184+ RelationalExprPredicate <$> (parens relExprP <|> relTerm)
155185
156−relationalBooleanExprP :: Parser RestrictionPredicateExpr
157−relationalBooleanExprP = do
158− relexpr <- relExprP
159− return $ RelationalExprPredicate relexpr
160−
161−restrictionAttributeEqualityP :: Parser RestrictionPredicateExpr
186+restrictionAttributeEqualityP :: RelationalMarkerExpr a => Parser (RestrictionPredicateExprBase a)
162187restrictionAttributeEqualityP = do
163− attributeName <- identifier
188+ attributeName <- attributeNameP
164189 reservedOp "="
165− atomexpr <- atomExprP
166− return $ AttributeEqualityPredicate (T.pack attributeName) atomexpr
190+ AttributeEqualityPredicate attributeName <$> atomExprP
167191
168−restrictionAtomExprP :: Parser RestrictionPredicateExpr --atoms which are of type "boolean"
192+restrictionAtomExprP :: RelationalMarkerExpr a=> Parser (RestrictionPredicateExprBase a) --atoms which are of type "boolean"
169193restrictionAtomExprP = do
170194 _ <- char '^' -- not ideal, but allows me to continue to use a context-free grammar
171− AtomExprPredicate <$> atomExprP
195+ (try (char 't') >> pure TruePredicate) <|> (try (char 'f') >> pure (NotPredicate TruePredicate)) <|> AtomExprPredicate <$> atomExprP
172196
173−multiTupleExpressionP :: Parser [ExtendTupleExpr]
197+multiTupleExpressionP :: RelationalMarkerExpr a => Parser [ExtendTupleExprBase a]
174198multiTupleExpressionP = sepBy extendTupleExpressionP comma
175199
176−extendTupleExpressionP :: Parser ExtendTupleExpr
200+extendTupleExpressionP :: RelationalMarkerExpr a => Parser (ExtendTupleExprBase a)
177201extendTupleExpressionP = attributeExtendTupleExpressionP
178202
179−attributeExtendTupleExpressionP :: Parser ExtendTupleExpr
203+attributeExtendTupleExpressionP :: RelationalMarkerExpr a => Parser (ExtendTupleExprBase a)
180204attributeExtendTupleExpressionP = do
181− newAttr <- identifier
205+ newAttr <- attributeNameP
182206 reservedOp ":="
183− atom <- atomExprP
184− return $ AttributeExtendTupleExpr (T.pack newAttr) atom
207+ AttributeExtendTupleExpr newAttr <$> atomExprP
185208
186−atomExprP :: Parser AtomExpr
209+atomExprP :: RelationalMarkerExpr a => Parser (AtomExprBase a)
187210atomExprP = consumeAtomExprP True
188211
189−consumeAtomExprP :: Bool -> Parser AtomExpr
212+consumeAtomExprP :: RelationalMarkerExpr a => Bool -> Parser (AtomExprBase a)
190213consumeAtomExprP consume = try functionAtomExprP <|>
191214 try (parens (constructedAtomExprP True)) <|>
192215 constructedAtomExprP consume <|>
193216 attributeAtomExprP <|>
194− nakedAtomExprP <|>
217+ try nakedAtomExprP <|>
195218 relationalAtomExprP
219+
196220
197−attributeAtomExprP :: Parser AtomExpr
221+attributeAtomExprP :: Parser (AtomExprBase a)
198222attributeAtomExprP = do
199223 _ <- string "@"
200− attrName <- identifier
201− return $ AttributeAtomExpr (T.pack attrName)
224+ AttributeAtomExpr <$> attributeNameP
202225
203−nakedAtomExprP :: Parser AtomExpr
226+nakedAtomExprP :: Parser (AtomExprBase a)
204227nakedAtomExprP = NakedAtomExpr <$> atomP
205228
206−constructedAtomExprP :: Bool -> Parser AtomExpr
229+constructedAtomExprP :: RelationalMarkerExpr a => Bool -> Parser (AtomExprBase a)
207230constructedAtomExprP consume = do
208− dConsName <- capitalizedIdentifier
209− dConsArgs <- if consume then sepBy (consumeAtomExprP False) spaces else pure []
210− pure $ ConstructedAtomExpr (T.pack dConsName) dConsArgs
211−
231+ dConsName <- dataConstructorNameP
232+ dConsArgs <- if consume then sepBy (consumeAtomExprP False) spaceConsumer else pure []
233+ ConstructedAtomExpr dConsName dConsArgs <$> parseMarkerP
234+
212235-- used only for primitive type parsing ?
213236atomP :: Parser Atom
214−atomP = stringAtomP <|>
215− doubleAtomP <|>
216− intAtomP <|>
237+atomP = stringAtomP <|>
238+ try doubleAtomP <|>
239+ integerAtomP <|>
217240 boolAtomP
218−
219−functionAtomExprP :: Parser AtomExpr
220−functionAtomExprP = do
221− funcName <- identifier
222− argList <- parens (sepBy atomExprP comma)
223− return $ FunctionAtomExpr (T.pack funcName) argList
224−
225−relationalAtomExprP :: Parser AtomExpr
241+
242+functionAtomExprP :: RelationalMarkerExpr a => Parser (AtomExprBase a)
243+functionAtomExprP =
244+ FunctionAtomExpr <$> uncapitalizedIdentifier <*> parens (sepBy atomExprP comma) <*> parseMarkerP
245+
246+relationalAtomExprP :: RelationalMarkerExpr a => Parser (AtomExprBase a)
226247relationalAtomExprP = RelationAtomExpr <$> relExprP
227248
228249stringAtomP :: Parser Atom
229−stringAtomP = liftA (TextAtom . T.pack) quotedString
250+stringAtomP = TextAtom <$> quotedString
230251
231−doubleAtomP :: Parser Atom
232−doubleAtomP = DoubleAtom <$> (try float)
252+doubleAtomP :: Parser Atom
253+doubleAtomP = DoubleAtom <$> float
233254
234−intAtomP :: Parser Atom
235−intAtomP = do
236− i <- integer
237− return $ IntAtom (fromIntegral i)
255+integerAtomP :: Parser Atom
256+integerAtomP = IntegerAtom <$> integer
238257
239258boolAtomP :: Parser Atom
240259boolAtomP = do
241− val <- char 't' <|> char 'f'
242− return $ BoolAtom (val == 't')
243−
244−relationAtomExprP :: Parser AtomExpr
260+ v <- identifier
261+ if v == "t" || v == "f" then
262+ pure $ BoolAtom (v == "t")
263+ else
264+ fail "invalid boolAtom"
265+
266+
267+relationAtomExprP :: RelationalMarkerExpr a => Parser (AtomExprBase a)
245268relationAtomExprP = RelationAtomExpr <$> makeRelationP
269+
270+withMacroExprP :: RelationalMarkerExpr a => Parser (RelationalExprBase a)
271+withMacroExprP = do
272+ reservedOp "with"
273+ views <- parens (sepBy1 createMacroP comma)
274+ With views <$> relExprP
275+
276+createMacroP :: RelationalMarkerExpr a => Parser (WithNameExprBase a, RelationalExprBase a)
277+createMacroP = do
278+ name <- identifier
279+ reservedOp "as"
280+ expr <- relExprP
281+ marker <- parseMarkerP
282+ pure (WithNameExpr name marker, expr)
283+
284+
src/bin/TutorialD/Interpreter/SchemaOperator.hsnew file+77
@@ -0,0 +1,77 @@
1+module TutorialD.Interpreter.SchemaOperator where
2+import Text.Megaparsec
3+import ProjectM36.Base
4+import ProjectM36.IsomorphicSchema
5+import ProjectM36.Session
6+import ProjectM36.Client
7+import TutorialD.Interpreter.RelationalExpr
8+import TutorialD.Interpreter.Base
9+
10+data SchemaOperator = ModifySchemaExpr SchemaExpr |
11+ SetCurrentSchema SchemaName
12+ deriving Show
13+
14+schemaOperatorP :: Parser SchemaOperator
15+schemaOperatorP = (ModifySchemaExpr <$> schemaExprP) <|>
16+ setCurrentSchemaP
17+
18+setCurrentSchemaP :: Parser SchemaOperator
19+setCurrentSchemaP = do
20+ reserved ":setschema"
21+ SetCurrentSchema <$> identifier
22+
23+schemaExprP :: Parser SchemaExpr
24+schemaExprP = addSubschemaP <|>
25+ removeSubschemaP
26+
27+addSubschemaP :: Parser SchemaExpr
28+addSubschemaP = do
29+ reserved ":addschema"
30+ AddSubschema <$> identifier <*> parens (sepBy schemaIsomorphP comma)
31+
32+schemaIsomorphP :: Parser SchemaIsomorph
33+schemaIsomorphP = isoRestrictP <|> isoUnionP <|> isoRenameP <|> isoPassthrough
34+
35+removeSubschemaP :: Parser SchemaExpr
36+removeSubschemaP = do
37+ reserved ":removeschema"
38+ RemoveSubschema <$> identifier
39+
40+isoRestrictP :: Parser SchemaIsomorph
41+isoRestrictP = do
42+ reserved "isorestrict"
43+ relVarIn <- qrelVarP
44+ relvarsOut <- isoRestrictOutRelVarsP
45+ IsoRestrict relVarIn <$> restrictionPredicateP <*> pure relvarsOut
46+
47+isoRestrictOutRelVarsP :: Parser (RelVarName, RelVarName)
48+isoRestrictOutRelVarsP = (,) <$> qrelVarP <*> qrelVarP
49+
50+qrelVarP :: Parser RelVarName
51+qrelVarP = quotedString
52+
53+isoUnionP :: Parser SchemaIsomorph
54+isoUnionP = do
55+ reserved "isounion"
56+ relVarsIn <- isoUnionInRelVarsP
57+ relVarsOut <- qrelVarP
58+ IsoUnion relVarsIn <$> restrictionPredicateP <*> pure relVarsOut
59+
60+isoRenameP :: Parser SchemaIsomorph
61+isoRenameP = do
62+ reserved "isorename"
63+ IsoRename <$> qrelVarP <*> qrelVarP
64+
65+isoPassthrough :: Parser SchemaIsomorph
66+isoPassthrough = do
67+ reserved "isopassthrough"
68+ rv <- qrelVarP
69+ pure (IsoRename rv rv)
70+
71+isoUnionInRelVarsP :: Parser (RelVarName, RelVarName)
72+isoUnionInRelVarsP = (,) <$> qrelVarP <*> qrelVarP
73+
74+evalSchemaOperator :: SessionId -> Connection -> SchemaOperator -> IO (Either RelationalError ())
75+evalSchemaOperator sessionId conn (ModifySchemaExpr expr) = executeSchemaExpr sessionId conn expr
76+evalSchemaOperator sessionId conn (SetCurrentSchema sname) = setCurrentSchemaName sessionId conn sname
77+
src/bin/TutorialD/Interpreter/TransGraphRelationalOperator.hsnew file+46
@@ -0,0 +1,46 @@
1+{-# LANGUAGE FlexibleInstances #-}
2+{-# OPTIONS_GHC -fno-warn-orphans #-}
3+module TutorialD.Interpreter.TransGraphRelationalOperator where
4+import ProjectM36.TransGraphRelationalExpression
5+import ProjectM36.TransactionGraph
6+import TutorialD.Interpreter.Types
7+import qualified ProjectM36.Client as C
8+
9+import TutorialD.Interpreter.Base
10+import TutorialD.Interpreter.RelationalExpr
11+
12+import qualified Data.Text as T
13+
14+instance RelationalMarkerExpr TransactionIdLookup where
15+ parseMarkerP = string "@" *> transactionIdLookupP
16+
17+newtype TransGraphRelationalOperator = ShowTransGraphRelation TransGraphRelationalExpr
18+ deriving Show
19+
20+transactionIdLookupP :: Parser TransactionIdLookup
21+transactionIdLookupP = (TransactionIdLookup <$> uuidP) <|>
22+ (TransactionIdHeadNameLookup <$> identifier <*> many transactionIdHeadBacktrackP)
23+
24+transactionIdHeadBacktrackP :: Parser TransactionIdHeadBacktrack
25+transactionIdHeadBacktrackP = (string "~" *> (TransactionIdHeadParentBacktrack <$> backtrackP)) <|>
26+ (string "^" *> (TransactionIdHeadBranchBacktrack <$> backtrackP)) <|>
27+ (string "@" *> (TransactionStampHeadBacktrack <$> utcTimeP))
28+
29+backtrackP :: Parser Int
30+backtrackP = fromIntegral <$> integer <|> pure 1
31+
32+transGraphRelationalOpP :: Parser TransGraphRelationalOperator
33+transGraphRelationalOpP = showTransGraphRelationalOpP
34+
35+showTransGraphRelationalOpP :: Parser TransGraphRelationalOperator
36+showTransGraphRelationalOpP = do
37+ reservedOp ":showtransgraphexpr"
38+ ShowTransGraphRelation <$> relExprP
39+
40+evalTransGraphRelationalOp :: C.SessionId -> C.Connection -> TransGraphRelationalOperator -> IO TutorialDOperatorResult
41+evalTransGraphRelationalOp sessionId conn (ShowTransGraphRelation expr) = do
42+ res <- C.executeTransGraphRelationalExpr sessionId conn expr
43+ case res of
44+ Left err -> pure $ DisplayErrorResult $ T.pack (show err)
45+ Right rel -> pure $ DisplayRelationResult rel
46+
src/bin/TutorialD/Interpreter/TransactionGraphOperator.hs+50−33
@@ -1,85 +1,94 @@
11{-# LANGUAGE GADTs #-}
22module TutorialD.Interpreter.TransactionGraphOperator where
33import TutorialD.Interpreter.Base
4−import Text.Parsec
5−import Text.Parsec.String
6−import qualified Data.UUID as U
7−import qualified Data.Text as T
8−import ProjectM36.TransactionGraph
9−import ProjectM36.Client
10−import ProjectM36.Error
4+import ProjectM36.TransactionGraph hiding (autoMergeToHead)
5+import ProjectM36.Client as C
116import ProjectM36.Base
7+import ProjectM36.Relation (relationTrue)
8+import Data.Functor
9+
10+data ConvenienceTransactionGraphOperator = AutoMergeToHead MergeStrategy HeadName
11+ deriving (Show)
12+
13+convenienceTransactionGraphOpP :: Parser ConvenienceTransactionGraphOperator
14+convenienceTransactionGraphOpP = autoMergeToHeadP
15+
16+autoMergeToHeadP :: Parser ConvenienceTransactionGraphOperator
17+autoMergeToHeadP = do
18+ reserved ":automergetohead"
19+ AutoMergeToHead <$> mergeTransactionStrategyP <*> identifier
1220
1321jumpToHeadP :: Parser TransactionGraphOperator
1422jumpToHeadP = do
1523 reservedOp ":jumphead"
16− headid <- identifier
17− return $ JumpToHead (T.pack headid)
24+ JumpToHead <$> identifier
1825
1926jumpToTransactionP :: Parser TransactionGraphOperator
2027jumpToTransactionP = do
2128 reservedOp ":jump"
22− uuid <- uuidP
23− return $ JumpToTransaction uuid
29+ JumpToTransaction <$> uuidP
30+
31+walkBackToTimeP :: Parser TransactionGraphOperator
32+walkBackToTimeP = do
33+ reservedOp ":walkbacktotime"
34+ WalkBackToTime <$> utcTimeP
2435
2536branchTransactionP :: Parser TransactionGraphOperator
2637branchTransactionP = do
2738 reservedOp ":branch"
28− branchName <- identifier
29− return $ Branch (T.pack branchName)
39+ Branch <$> identifier
40+
41+deleteBranchP :: Parser TransactionGraphOperator
42+deleteBranchP = do
43+ reserved ":deletebranch"
44+ DeleteBranch <$> identifier
3045
3146commitTransactionP :: Parser TransactionGraphOperator
3247commitTransactionP = do
3348 reservedOp ":commit"
34− return $ Commit
49+ pure Commit
3550
3651rollbackTransactionP :: Parser TransactionGraphOperator
3752rollbackTransactionP = do
3853 reservedOp ":rollback"
39− return $ Rollback
54+ return Rollback
4055
4156showGraphP :: Parser ROTransactionGraphOperator
4257showGraphP = do
4358 reservedOp ":showgraph"
44− return $ ShowGraph
59+ return ShowGraph
4560
4661mergeTransactionStrategyP :: Parser MergeStrategy
47−mergeTransactionStrategyP = (reserved "union" *> pure UnionMergeStrategy) <|>
62+mergeTransactionStrategyP = (reserved "union" $> UnionMergeStrategy) <|>
4863 (do
4964 reserved "selectedbranch"
50− branch <- identifier
51− pure (SelectedBranchMergeStrategy (T.pack branch))) <|>
65+ SelectedBranchMergeStrategy <$> identifier) <|>
5266 (do
5367 reserved "unionpreferbranch"
54− branch <- identifier
55− pure (UnionPreferMergeStrategy (T.pack branch)))
68+ UnionPreferMergeStrategy <$> identifier)
5669
5770mergeTransactionsP :: Parser TransactionGraphOperator
5871mergeTransactionsP = do
5972 reservedOp ":mergetrans"
60− strategy <- mergeTransactionStrategyP
61− headA <- identifier
62− headB <- identifier
63− pure (MergeTransactions strategy (T.pack headA) (T.pack headB))
73+ MergeTransactions <$> mergeTransactionStrategyP <*> identifier <*> identifier
74+
75+validateMerkleHashesP :: Parser ROTransactionGraphOperator
76+validateMerkleHashesP = reservedOp ":validatemerklehashes" $> ValidateMerkleHashes
6477
6578transactionGraphOpP :: Parser TransactionGraphOperator
66−transactionGraphOpP = do
79+transactionGraphOpP =
6780 jumpToHeadP
6881 <|> jumpToTransactionP
82+ <|> walkBackToTimeP
6983 <|> branchTransactionP
84+ <|> deleteBranchP
7085 <|> commitTransactionP
7186 <|> rollbackTransactionP
7287 <|> mergeTransactionsP
7388
7489roTransactionGraphOpP :: Parser ROTransactionGraphOperator
75−roTransactionGraphOpP = showGraphP
90+roTransactionGraphOpP = showGraphP <|> validateMerkleHashesP
7691
77−uuidP :: Parser U.UUID
78−uuidP = do
79− uuidStr <- many (alphaNum <|> char '-')
80− case U.fromString uuidStr of
81− Nothing -> fail "Invalid uuid string"
82− Just uuid -> return uuid
8392
8493
8594{-
@@ -96,3 +105,11 @@ interpretOps newUUID trans@(DisconnectedTransaction _ context) transGraph instri
96105
97106evalROGraphOp :: SessionId -> Connection -> ROTransactionGraphOperator -> IO (Either RelationalError Relation)
98107evalROGraphOp sessionId conn ShowGraph = transactionGraphAsRelation sessionId conn
108+evalROGraphOp sessionId conn ValidateMerkleHashes = do
109+ eVal <- C.validateMerkleHashes sessionId conn
110+ case eVal of
111+ Left err -> pure (Left err)
112+ Right _ -> pure (Right relationTrue)
113+
114+evalConvenienceGraphOp :: SessionId -> Connection -> ConvenienceTransactionGraphOperator -> IO (Either RelationalError ())
115+evalConvenienceGraphOp sessionId conn (AutoMergeToHead strat head') = autoMergeToHead sessionId conn strat head'
src/bin/TutorialD/Interpreter/Types.hs+38−26
@@ -1,49 +1,61 @@
11--parse type and data constructors
22module TutorialD.Interpreter.Types where
33import ProjectM36.Base
4−import Text.Parsec.String
5−import Text.Parsec
4+import Text.Megaparsec
65import TutorialD.Interpreter.Base
7−import ProjectM36.DataTypes.Primitive
8−import Control.Monad (liftM)
9−import qualified Data.Text as T
6+
7+class RelationalMarkerExpr a where
8+ parseMarkerP :: Parser a
9+
10+instance RelationalMarkerExpr () where
11+ parseMarkerP = pure ()
12+
13+typeConstructorNameP :: Parser TypeConstructorName
14+typeConstructorNameP = capitalizedIdentifier
15+
16+dataConstructorNameP :: Parser DataConstructorName
17+dataConstructorNameP = capitalizedIdentifier
1018
1119-- | Upper case names are type names while lower case names are polymorphic typeconstructor arguments.
1220-- data *Either a b* = Left a | Right b
1321typeConstructorDefP :: Parser TypeConstructorDef
14−typeConstructorDefP = ADTypeConstructorDef <$> liftM T.pack capitalizedIdentifier <*> typeVarNamesP
22+typeConstructorDefP = ADTypeConstructorDef <$> typeConstructorNameP <*> typeVarNamesP
1523
1624typeVarNamesP :: Parser [TypeVarName]
17−typeVarNamesP = do
18− vars <- many uncapitalizedIdentifier
19− pure (map T.pack vars)
25+typeVarNamesP = many uncapitalizedIdentifier
2026
2127-- data Either a b = *Left a* | *Right b*
2228dataConstructorDefP :: Parser DataConstructorDef
23−dataConstructorDefP = DataConstructorDef <$> liftM T.pack capitalizedIdentifier <*> many dataConstructorDefArgP
29+dataConstructorDefP = DataConstructorDef <$> typeConstructorNameP <*> many dataConstructorDefArgP
2430
2531-- data *Either a b* = Left *a* | Right *b*
2632dataConstructorDefArgP :: Parser DataConstructorDefArg
27−dataConstructorDefArgP = parens (DataConstructorDefTypeConstructorArg <$> typeConstructorP) <|>
28− DataConstructorDefTypeConstructorArg <$> typeConstructorP <|>
29− DataConstructorDefTypeVarNameArg <$> liftM T.pack uncapitalizedIdentifier
33+dataConstructorDefArgP = DataConstructorDefTypeConstructorArg <$> (monoTypeConstructorP <|> parens typeConstructorP) <|>
34+ DataConstructorDefTypeVarNameArg <$> uncapitalizedIdentifier
3035
31−--built-in, nullary type constructors
32−-- Int, Text, etc.
33−primitiveTypeConstructorP :: Parser TypeConstructor
34−primitiveTypeConstructorP = choice (map (\(PrimitiveTypeConstructorDef name typ, _) -> do
35− tName <- try $ liftM T.pack (symbol (T.unpack name))
36− pure $ PrimitiveTypeConstructor tName typ)
37− primitiveTypeConstructorMapping)
38−
36+-- relation{a Int} in type construction (no tuples parsed)
37+relationTypeConstructorP :: Parser TypeConstructor
38+relationTypeConstructorP = do
39+ reserved "relation"
40+ RelationAtomTypeConstructor <$> makeAttributeExprsP
41+
42+--used in relation creation
43+makeAttributeExprsP :: RelationalMarkerExpr a => Parser [AttributeExprBase a]
44+makeAttributeExprsP = braces (sepBy attributeAndTypeNameP comma)
45+
46+attributeAndTypeNameP :: RelationalMarkerExpr a => Parser (AttributeExprBase a)
47+attributeAndTypeNameP = AttributeAndTypeNameExpr <$> identifier <*> typeConstructorP <*> parseMarkerP
48+
3949-- *Either Int Text*, *Int*
4050typeConstructorP :: Parser TypeConstructor
41−typeConstructorP = primitiveTypeConstructorP <|>
42− ADTypeConstructor <$> liftM T.pack capitalizedIdentifier <*> many typeConstructorArgP
51+typeConstructorP = relationTypeConstructorP <|>
52+ ADTypeConstructor <$> capitalizedIdentifier <*> many (monoTypeConstructorP <|> parens typeConstructorP) <|>
53+ monoTypeConstructorP
54+
55+monoTypeConstructorP :: Parser TypeConstructor
56+monoTypeConstructorP = ADTypeConstructor <$> typeConstructorNameP <*> pure [] <|>
57+ TypeVariable <$> uncapitalizedIdentifier
4358
44−typeConstructorArgP :: Parser TypeConstructorArg
45−typeConstructorArgP = TypeConstructorArg <$> typeConstructorP <|>
46− TypeConstructorTypeVarArg <$> liftM T.pack uncapitalizedIdentifier
4759
4860
4961
src/bin/TutorialD/Printer.hsnew file+165
@@ -0,0 +1,165 @@
1+{-# OPTIONS_GHC -fno-warn-orphans #-}
2+{-# LANGUAGE FlexibleInstances #-}
3+{-# LANGUAGE OverloadedStrings #-}
4+{-# LANGUAGE ScopedTypeVariables #-}
5+{-# LANGUAGE TypeApplications #-}
6+module TutorialD.Printer where
7+import ProjectM36.Base
8+import ProjectM36.Attribute as A hiding (null)
9+import Data.Text.Prettyprint.Doc
10+import qualified Data.Set as S hiding (fromList)
11+import qualified Data.Vector as V
12+import qualified Data.Map.Strict as M
13+import Data.Time.Calendar
14+import Data.Time.Clock.POSIX
15+import qualified Data.ByteString.Base64 as B64
16+import qualified Data.Text.Encoding as TE
17+
18+instance Pretty Atom where
19+ pretty (IntegerAtom x) = pretty x
20+ pretty (IntAtom x) = "int" <> parensList [pretty x]
21+ pretty (DoubleAtom x) = pretty x
22+ pretty (TextAtom x) = dquotes (pretty x)
23+ pretty (DayAtom x) = "fromGregorian" <> parensList [pretty a, pretty b, pretty c]
24+ where
25+ (a,b,c) = toGregorian x
26+ pretty (DateTimeAtom time) = "dateTimeFromEpochSeconds" <> parensList [pretty @Integer (round (utcTimeToPOSIXSeconds time))]
27+ pretty (ByteStringAtom bs) = "bytestring" <> parensList [dquotes (pretty (TE.decodeUtf8 (B64.encode bs)))]
28+ pretty (BoolAtom x) = if x then "t" else "f"
29+ pretty (RelationAtom x) = pretty x
30+ pretty (RelationalExprAtom re) = pretty re
31+ pretty (ConstructedAtom n _ as) = pretty n <+> prettyList as
32+
33+instance Pretty AtomExpr where
34+ pretty (AttributeAtomExpr attrName) = pretty attrName
35+ pretty (NakedAtomExpr atom) = pretty atom
36+ pretty (FunctionAtomExpr atomFuncName' atomExprs _) = pretty atomFuncName' <> prettyAtomExprsAsArguments atomExprs
37+ pretty (RelationAtomExpr relExpr) = pretty relExpr
38+ pretty (ConstructedAtomExpr dName [] _) = pretty dName
39+ pretty (ConstructedAtomExpr dName atomExprs _) = pretty dName <+> hsep (map prettyAtomExpr atomExprs)
40+
41+prettyAtomExpr :: AtomExpr -> Doc ann
42+prettyAtomExpr atomExpr =
43+ case atomExpr of
44+ AttributeAtomExpr attrName -> "@" <> pretty attrName
45+ ConstructedAtomExpr dConsName [] () -> pretty dConsName
46+ ConstructedAtomExpr dConsName atomExprs () -> parens (pretty dConsName <+> hsep (map prettyAtomExpr atomExprs))
47+ _ -> pretty atomExpr
48+
49+prettyAtomExprsAsArguments :: [AtomExpr] -> Doc ann
50+prettyAtomExprsAsArguments = align . parensList . map addAt
51+ where addAt (atomExpr :: AtomExpr) =
52+ case atomExpr of
53+ AttributeAtomExpr attrName -> "@" <> pretty attrName
54+ _ -> pretty atomExpr
55+
56+instance Pretty TupleExpr where
57+ pretty (TupleExpr map') = "tuple" <> bracesList (Prelude.map (\(attrName,atom)-> pretty attrName <+> pretty atom) (M.toList map'))
58+
59+instance Pretty RelationTuple where
60+ pretty (RelationTuple attrs atoms) = "tuple" <> bracesList (zipWith (\x y-> pretty x <+> pretty y) (V.toList (attributeNames attrs)) (V.toList atoms))
61+
62+instance Pretty Relation where
63+ pretty (Relation attrs tupSet) | attrs == mempty && null (asList tupSet) = "false"
64+ pretty (Relation attrs tupSet) | attrs == mempty && asList tupSet == [RelationTuple mempty mempty] = "true"
65+ pretty (Relation attrs tupSet) = "relation" <> prettyBracesList (A.toList attrs) <> prettyBracesList (asList tupSet)
66+
67+instance Pretty Attribute where
68+ pretty (Attribute n aTy) = pretty n <+> pretty (show aTy) -- workaround
69+
70+instance Pretty RelationalExpr where
71+ pretty (RelationVariable n _) = pretty n
72+ pretty (ExistingRelation r) = pretty r
73+ pretty (NotEquals a b) = pretty' a <+> "!=" <+> pretty' b
74+ pretty (Equals a b) = pretty' a <+> "==" <+> pretty' b
75+ pretty (Project ns r) = pretty' (ignoreProjects r) <> pretty ns
76+ pretty (Extend ext r) = collectExtends r <> pretty ext <> "}"
77+ pretty (MakeRelationFromExprs Nothing (TupleExprs () tupExprs)) = "relation" <> prettyBracesList tupExprs
78+ pretty (MakeRelationFromExprs (Just attrExprs) (TupleExprs () tupExprs)) = "relation" <> prettyBracesList attrExprs <> prettyBracesList tupExprs
79+ pretty (MakeStaticRelation attrs tupSet) = "relation" <> prettyBracesList (A.toList attrs) <> prettyBracesList (asList tupSet)
80+ pretty (Union a b) = parens $ pretty' a <+> "union" <+> pretty' b
81+ pretty (Join a b) = parens $ pretty' a <+> "join" <+> pretty' b
82+ pretty (Rename n1 n2 relExpr) = parens $ pretty relExpr <+> "rename" <+> braces (pretty n1 <+> "as" <+> pretty n2)
83+ pretty (Difference a b) = parens $ pretty' a <+> "minus" <+> pretty' b
84+ pretty (Group attrNames attrName relExpr) = parens $ pretty relExpr <+> "group" <+> parens (pretty attrNames <+> "as" <+> pretty attrName)
85+ pretty (Ungroup attrName relExpr) = parens $ pretty' relExpr <+> "ungroup" <+> pretty attrName
86+ pretty (Restrict resPreExpr relExpr) = parens $ pretty' relExpr <+> "where" <+> pretty resPreExpr
87+ pretty (With pairs a) = "with" <+> parensList (map (\(name,expr)-> pretty name <+> "as" <+> pretty expr) pairs) <+> pretty' a
88+
89+-- relvar:{a:=?}:{b:=?}:... in ADTs => relvar:{a:=?, b:=?, ...} in Doc ann
90+collectExtends :: RelationalExpr -> Doc ann
91+collectExtends (Extend ext r) = collectExtends r <> pretty ext <> ", "
92+collectExtends r = pretty r <> ":{"
93+
94+--relvar{a,b,c,...}{a,b,...}..{a} => relvar{a}
95+ignoreProjects :: RelationalExpr -> RelationalExpr
96+ignoreProjects (Project _ r) = ignoreProjects r
97+ignoreProjects r = r
98+
99+prettyRelationalExpr :: RelationalExpr -> Doc n
100+prettyRelationalExpr (RelationVariable n _) = pretty n
101+prettyRelationalExpr r = parens (pretty r)
102+
103+pretty' :: RelationalExpr -> Doc n
104+pretty' = prettyRelationalExpr
105+
106+instance Pretty AttributeNames where
107+ pretty (AttributeNames attrNames) = prettyBracesList (S.toList attrNames)
108+ pretty (InvertedAttributeNames attrNames) = braces $ "all but" <+> concatWith (surround ", ") (map pretty (S.toList attrNames))
109+ pretty (RelationalExprAttributeNames relExpr) = braces $ "all from" <+> pretty relExpr
110+ pretty (UnionAttributeNames aAttrNames bAttrNames) = braces ("union of" <+> pretty aAttrNames <+> pretty bAttrNames)
111+ pretty (IntersectAttributeNames aAttrNames bAttrNames) = braces ("intersection of" <+> pretty aAttrNames <+> pretty bAttrNames)
112+
113+instance Pretty AttributeExpr where
114+ pretty (NakedAttributeExpr attr) = pretty attr
115+ pretty (AttributeAndTypeNameExpr name typeCons _) = pretty name <+> pretty typeCons
116+
117+instance Pretty TypeConstructor where
118+ pretty (ADTypeConstructor tcName []) = pretty tcName
119+ pretty (ADTypeConstructor tcName tConsArgs) = pretty tcName <+> hsep (map pretty tConsArgs)
120+ pretty (PrimitiveTypeConstructor tcName atomType') = pretty tcName <+> pretty atomType'
121+ pretty (RelationAtomTypeConstructor attrExprs) = "relation" <> prettyBracesList attrExprs
122+ pretty (TypeVariable x) = pretty x
123+
124+instance Pretty AtomType where
125+ pretty IntAtomType = "Int"
126+ pretty IntegerAtomType = "Integer"
127+ pretty DoubleAtomType = "Double"
128+ pretty TextAtomType = "Text"
129+ pretty DayAtomType = "Day"
130+ pretty DateTimeAtomType = "DateTime"
131+ pretty ByteStringAtomType = "ByteString"
132+ pretty BoolAtomType = "Bool"
133+ pretty (RelationAtomType attrs) = "relation " <+> prettyBracesList (A.toList attrs)
134+ pretty (ConstructedAtomType tcName tvMap) = pretty tcName <+> hsep (map pretty (M.toList tvMap)) --order matters
135+ pretty RelationalExprAtomType = "RelationalExpr"
136+ pretty (TypeVariableType x) = pretty x
137+
138+instance Pretty ExtendTupleExpr where
139+ pretty (AttributeExtendTupleExpr attrName atomExpr) = pretty attrName <> ":=" <> pretty atomExpr
140+
141+
142+instance Pretty RestrictionPredicateExpr where
143+ pretty TruePredicate = "true"
144+ pretty (AndPredicate a b) = pretty a <+> "and" <+> pretty b
145+ pretty (OrPredicate a b) = pretty a <+> "or" <+> pretty b
146+ pretty (NotPredicate a) = "not" <+> pretty a
147+ pretty (RelationalExprPredicate relExpr) = pretty relExpr
148+ pretty (AtomExprPredicate atomExpr) = pretty atomExpr
149+ pretty (AttributeEqualityPredicate attrName atomExpr) = pretty attrName <> "=" <> pretty atomExpr
150+
151+instance Pretty WithNameExpr where
152+ pretty (WithNameExpr name _) = pretty name
153+
154+bracesList :: [Doc ann] -> Doc ann
155+bracesList = group . encloseSep (flatAlt "{ " "{") (flatAlt " }" "}") ", "
156+
157+prettyBracesList :: Pretty a => [a] -> Doc ann
158+prettyBracesList = align . bracesList . map pretty
159+
160+parensList :: [Doc ann] -> Doc ann
161+parensList = group . encloseSep (flatAlt "( " "(") (flatAlt " )" ")") ", "
162+
163+prettyParensList :: Pretty a => [a] -> Doc ann
164+prettyParensList = align . parensList . map pretty
165+
src/bin/TutorialD/tutd.hs+72−61
@@ -2,98 +2,109 @@
22import TutorialD.Interpreter
33import ProjectM36.Base
44import ProjectM36.Client
5+import ProjectM36.Server.ParseArgs
6+import ProjectM36.Server
57import System.IO
8+import GHC.IO.Encoding
69import Options.Applicative
710import System.Exit
11+import Control.Monad
12+#if __GLASGOW_HASKELL__ < 804
13+import Data.Monoid
14+#endif
15+import Data.Maybe
16+import qualified Data.Text as T
17+
18+#if !defined(VERSION_project_m36)
19+# warning Failed to discover proper version from cabal_macros.h
20+# define VERSION_project_m36 "<unknown>"
21+#endif
822
923parseArgs :: Parser InterpreterConfig
10−parseArgs = LocalInterpreterConfig <$> parsePersistenceStrategy <*> parseHeadName <*> parseGhcPkgPaths <|>
11− RemoteInterpreterConfig <$> parseNodeId <*> parseDatabaseName <*> parseHeadName
24+parseArgs = LocalInterpreterConfig <$> parsePersistenceStrategy <*> parseHeadName <*> parseTutDExec <*> many parseGhcPkgPath <*> parseCheckFS <|>
25+ RemoteInterpreterConfig <$> parseHostname "127.0.0.1" <*> parsePort defaultServerPort <*> parseDatabaseName <*> parseHeadName <*> parseTutDExec <*> parseCheckFS
1226
13−parsePersistenceStrategy :: Parser PersistenceStrategy
14−parsePersistenceStrategy = CrashSafePersistence <$> (dbdirOpt <* fsyncOpt) <|>
15− MinimalPersistence <$> dbdirOpt <|>
16− pure NoPersistence
17− where
18− dbdirOpt = strOption (short 'd' <>
19− long "database-directory" <>
20− metavar "DIRECTORY" <>
21− showDefaultWith show
22− )
23− fsyncOpt = switch (short 'f' <>
24− long "fsync" <>
25− help "Fsync all new transactions.")
26−
2727parseHeadName :: Parser HeadName
2828parseHeadName = option auto (long "head" <>
2929 help "Start session at head name." <>
30+ metavar "GRAPH HEAD NAME" <>
3031 value "master"
3132 )
32−
33−parseDatabaseName :: Parser DatabaseName
34−parseDatabaseName = strOption (long "database" <>
35− help "Remote database name")
36−
37−parseNodeId :: Parser NodeId
38−parseNodeId = createNodeId <$>
39− strOption (long "host" <>
40− short 'h' <>
41− help "Remote host name" <>
42− value "127.0.0.1") <*>
43− option auto (long "port" <>
44− short 'p' <>
45− help "Remote port" <>
46− value defaultServerPort)
47−
48−parseGhcPkgPaths :: Parser [GhcPkgPath]
49−parseGhcPkgPaths = many (strOption (long "ghc-pkg-dir" <>
50− metavar "GHC_PACKAGE_DIRECTORY"))
33+
34+--just execute some tutd and exit
35+parseTutDExec :: Parser (Maybe TutorialDExec)
36+parseTutDExec = optional $ strOption (long "exec-tutd" <>
37+ short 'e' <>
38+ metavar "TUTORIALD" <>
39+ help "Execute TutorialD expression and exit"
40+ )
5141
5242opts :: ParserInfo InterpreterConfig
53−opts = info parseArgs idm
43+opts = info (parseArgs <**> helpOption) idm
5444
5545connectionInfoForConfig :: InterpreterConfig -> ConnectionInfo
56−connectionInfoForConfig (LocalInterpreterConfig pStrategy _ ghcPkgPaths) = InProcessConnectionInfo pStrategy outputNotificationCallback ghcPkgPaths
57−connectionInfoForConfig (RemoteInterpreterConfig remoteNodeId remoteDBName _) = RemoteProcessConnectionInfo remoteDBName remoteNodeId outputNotificationCallback
46+connectionInfoForConfig (LocalInterpreterConfig pStrategy _ _ ghcPkgPaths _) = InProcessConnectionInfo pStrategy outputNotificationCallback ghcPkgPaths
47+connectionInfoForConfig (RemoteInterpreterConfig remoteHost remotePort remoteDBName _ _ _) = RemoteConnectionInfo remoteDBName remoteHost (show remotePort) outputNotificationCallback
5848
5949headNameForConfig :: InterpreterConfig -> HeadName
60−headNameForConfig (LocalInterpreterConfig _ headn _) = headn
61−headNameForConfig (RemoteInterpreterConfig _ _ headn) = headn
50+headNameForConfig (LocalInterpreterConfig _ headn _ _ _) = headn
51+headNameForConfig (RemoteInterpreterConfig _ _ _ headn _ _) = headn
52+
53+execTutDForConfig :: InterpreterConfig -> Maybe String
54+execTutDForConfig (LocalInterpreterConfig _ _ t _ _) = t
55+execTutDForConfig (RemoteInterpreterConfig _ _ _ _ t _) = t
56+
57+checkFSForConfig :: InterpreterConfig -> Bool
58+checkFSForConfig (LocalInterpreterConfig _ _ _ _ c) = c
59+checkFSForConfig (RemoteInterpreterConfig _ _ _ _ _ c) = c
6260
63−{-
64−ghcPkgPathsForConfig :: InterpreterConfig -> [GhcPkgPath]
65−ghcPkgPathsForConfig (LocalInterpreterConfig _ _ paths) = paths
66−ghcPkgPathsForConfig _ = error "Clients cannot configure remote ghc package paths."
67−-}
61+persistenceStrategyForConfig :: InterpreterConfig -> Maybe PersistenceStrategy
62+persistenceStrategyForConfig (LocalInterpreterConfig strat _ _ _ _) = Just strat
63+persistenceStrategyForConfig RemoteInterpreterConfig{} = Nothing
6864
6965errDie :: String -> IO ()
7066errDie err = hPutStrLn stderr err >> exitFailure
7167
72−#ifndef PROJECTM36_VERSION
73−#error PROJECTM36_VERSION is not defined
68+#ifndef VERSION_project_m36
69+#error VERSION_project_m36 is not defined
7470#endif
7571printWelcome :: IO ()
7672printWelcome = do
77− putStrLn $ "Project:M36 TutorialD Interpreter " ++ PROJECTM36_VERSION
73+ putStrLn $ "Project:M36 TutorialD Interpreter " ++ VERSION_project_m36
7874 putStrLn "Type \":help\" for more information."
7975 putStrLn "A full tutorial is available at:"
8076 putStrLn "https://github.com/agentm/project-m36/blob/master/docs/tutd_tutorial.markdown"
8177
78+-- | If the locale is set to ASCII, upgrade it to UTF-8 because tutd outputs UTF-8-encoded attributes. This is especially important in light docker images where the locale data may be missing.
79+setLocaleIfNecessary :: IO ()
80+setLocaleIfNecessary = do
81+ l <- getLocaleEncoding
82+ when (textEncodingName l == "ASCII") (setLocaleEncoding utf8)
83+
8284main :: IO ()
8385main = do
86+ setLocaleIfNecessary
8487 interpreterConfig <- execParser opts
8588 let connInfo = connectionInfoForConfig interpreterConfig
86− dbconn <- connectProjectM36 connInfo
87− case dbconn of
88− Left err -> do
89− errDie ("Failed to create database connection: " ++ show err)
90− Right conn -> do
91− let connHeadName = headNameForConfig interpreterConfig
92− eSessionId <- createSessionAtHead connHeadName conn
93− case eSessionId of
94− Left err -> errDie ("Failed to create database session at \"" ++ show connHeadName ++ "\": " ++ show err)
95− Right sessionId -> do
96− printWelcome
97− _ <- reprLoop interpreterConfig sessionId conn
98− pure ()
89+ fscheck <- checkFSType (checkFSForConfig interpreterConfig) (fromMaybe NoPersistence (persistenceStrategyForConfig interpreterConfig))
90+ if not fscheck then
91+ errDie checkFSErrorMsg
92+ else do
93+ dbconn <- connectProjectM36 connInfo
94+ case dbconn of
95+ Left err ->
96+ errDie ("Failed to create database connection: " ++ show err)
97+ Right conn -> do
98+ let connHeadName = headNameForConfig interpreterConfig
99+ eSessionId <- createSessionAtHead conn connHeadName
100+ case eSessionId of
101+ Left err -> errDie ("Failed to create database session at \"" ++ show connHeadName ++ "\": " ++ show err)
102+ Right sessionId ->
103+ case execTutDForConfig interpreterConfig of
104+ Nothing -> do
105+ printWelcome
106+ _ <- reprLoop interpreterConfig sessionId conn
107+ pure ()
108+ Just tutdStr ->
109+ runTutorialD sessionId conn Nothing (T.pack tutdStr)
99110
src/bin/benchmark/Basic.hsnew file+106
@@ -0,0 +1,106 @@
1+import ProjectM36.Base
2+import Criterion.Main
3+import qualified ProjectM36.Attribute as A
4+import ProjectM36.Relation
5+import ProjectM36.Persist
6+import ProjectM36.RelationalExpression
7+import ProjectM36.Error
8+import ProjectM36.Transaction.Persist
9+import qualified Data.Text as T
10+import qualified Data.Vector as V
11+import Control.Monad.Trans.Reader
12+import qualified ProjectM36.DatabaseContext as DBC
13+import qualified Data.Set as S
14+import Data.Monoid
15+import System.IO.Temp
16+import System.FilePath
17+import System.Directory
18+
19+{-
20+* create a relation
21+* restrict a relation
22+* project a relation
23+* join two relations
24+-}
25+
26+validate :: Either RelationalError a -> a
27+validate (Left err) = error (show err)
28+validate (Right x) = x
29+
30+createRelation :: Int -> Int -> Either RelationalError Relation
31+createRelation attributeCount tupleCount = do
32+ let attrs = A.attributesFromList $ map (\c-> Attribute (T.pack $ "a" ++ show c) IntAtomType) [0 .. attributeCount-1]
33+ tuple tupleX = RelationTuple attrs (V.generate attributeCount (\_ -> IntAtom (fromIntegral tupleX)))
34+ tuples = map tuple [0 .. tupleCount]
35+ mkRelationDeferVerify attrs (RelationTupleSet tuples)
36+
37+createRelation' :: Int -> Int -> Relation
38+createRelation' x y = validate (createRelation x y)
39+
40+restrictRelationToOneTuple :: Int -> Relation -> Relation
41+restrictRelationToOneTuple match rel = validate (runReader (evalRelationalExpr restriction) exprState)
42+ where
43+ exprState = mkRelationalExprState DBC.empty
44+ restriction = Restrict predicateMatch (ExistingRelation rel)
45+ predicateMatch = AttributeEqualityPredicate "a0" (NakedAtomExpr (IntAtom match))
46+
47+restrictRelationToHalfRelation :: Int -> Relation -> Relation
48+restrictRelationToHalfRelation cutoff rel = validate (runReader (evalRelationalExpr restriction) exprState)
49+ where
50+ exprState = mkRelationalExprState DBC.basicDatabaseContext
51+ restriction = Restrict predicateMatch (ExistingRelation rel)
52+ predicateMatch = AtomExprPredicate (FunctionAtomExpr "lte" [AttributeAtomExpr "a0", NakedAtomExpr (IntAtom cutoff)] ())
53+
54+projectRelationToAttributes :: AttributeNames -> Relation -> Relation
55+projectRelationToAttributes attrNames rel = validate (runReader (evalRelationalExpr projection) exprState)
56+ where
57+ exprState = mkRelationalExprState DBC.empty
58+ projection = Project attrNames (ExistingRelation rel)
59+
60+unionRelations :: Relation -> Relation -> Relation
61+unionRelations relA relB = validate (relA `union` relB)
62+
63+joinRelations :: Relation -> Relation -> Relation
64+joinRelations relA relB = validate (join relA relB)
65+
66+groupRelation :: AttributeNames -> Relation -> Relation
67+groupRelation attrNames rel = validate (runReader (evalRelationalExpr (Group attrNames "x" (ExistingRelation rel))) exprState)
68+ where
69+ exprState = mkRelationalExprState DBC.empty
70+
71+bigRelAttrNames :: Int -> Int -> AttributeNames
72+bigRelAttrNames start end = AttributeNames (S.fromList (map (\i -> "a" <> T.pack (show i)) [start .. end]))
73+
74+main :: IO ()
75+main = do
76+ tmpDir <- getCanonicalTemporaryDirectory
77+ createDirectoryIfMissing False (tmpDir </> "relvars")
78+ defaultMain [createRel, restrictRel, projectRel, unionRel, joinRel, groupRel, writeRel tmpDir]
79+ where
80+ createRel = bgroup "create" $ map (\tupCount -> bench ("relation 10x" ++ show tupCount) (nf (createRelation' 10) tupCount)) [100, 1000, 10000]
81+ bigrel10000 = createRelation' 10 10000
82+ bigrel1000 = createRelation' 10 1000
83+ bigrel100 = createRelation' 10 100
84+
85+ restrictRel = bgroup "restrict" [restrictOneTupleRel, restrictHalfTuplesRel]
86+ restrictOneTupleRel = bench "restrict relation 10x10000 to 10x1" (nf (restrictRelationToOneTuple 5000) bigrel10000)
87+ restrictHalfTuplesRel = bench "restrict relation 10x10000 to 10x5000" (nf (restrictRelationToHalfRelation 5000) bigrel10000)
88+
89+ projectRel = bgroup "project" [projectOneAttr, projectHalfAttrs]
90+ projectOneAttr = bench "project 10x1000 to 1x1000" (nf (projectRelationToAttributes (bigRelAttrNames 0 0)) bigrel1000)
91+ projectHalfAttrs = bench "project 10x1000 to 5x1000" (nf (projectRelationToAttributes (bigRelAttrNames 0 4)) bigrel1000)
92+
93+ unionRel = bgroup "union" [unionIdenticalRelations1000, unionIdenticalRelations10000]
94+ unionIdenticalRelations1000 = bench "union identical 10x1000" (nf (unionRelations bigrel1000) bigrel1000)
95+ unionIdenticalRelations10000 = bench "union identical 10x10000" (nf (unionRelations bigrel10000) bigrel10000)
96+
97+ joinRel = bgroup "join" [joinIdenticalRelations100]
98+ joinIdenticalRelations100 = bench "join identical 10x100" (nf (joinRelations bigrel100) bigrel100)
99+
100+ groupRel = bgroup "group" [group100]
101+ group100 = bench "group 10x100" (nf (groupRelation (bigRelAttrNames 1 9)) bigrel100)
102+
103+ writeRel tmpDir = bgroup "write" [writeRel10000 tmpDir]
104+ writeRel10000 tmpDir = bench "write 10x1000" $ nfIO (writeRelVar FsyncDiskSync tmpDir ("x", bigrel10000))
105+
106+
src/bin/benchmark/Handles.hsnew file+97
@@ -0,0 +1,97 @@
1+{-# LANGUAGE CPP #-}
2+--benchmark test for file handle leaks
3+import ProjectM36.Client
4+import ProjectM36.Persist
5+import Options.Applicative
6+import TutorialD.Interpreter
7+import TutorialD.Interpreter.Base hiding (Parser, option)
8+import qualified Data.Text as T
9+#if __GLASGOW_HASKELL__ < 804
10+import Data.Monoid
11+#endif
12+import Control.Monad
13+
14+data HandlesArgs = HandlesArgs {
15+ openCloseCount :: Int,
16+ transactionCount :: Int,
17+ dbdir :: FilePath,
18+ tutdSetup :: String,
19+ tutdIterate :: String
20+ }
21+
22+parseArgs :: Parser HandlesArgs
23+parseArgs = HandlesArgs <$> parseOpenAndCloseCount <*> parseTransactionCount <*> parseDbDir <*> parseTutdSetup <*> parseTutdIterate
24+
25+parseOpenAndCloseCount :: Parser Int
26+parseOpenAndCloseCount = option auto (short 'o' <> long "open-close-count")
27+
28+parseTransactionCount :: Parser Int
29+parseTransactionCount = option auto (short 't' <> long "transaction-count")
30+
31+parseDbDir :: Parser FilePath
32+parseDbDir = strOption (short 'd' <> long "dbdir")
33+
34+parseTutdSetup :: Parser String
35+parseTutdSetup = strOption (short 's' <> long "setup-tutd" <> value "x:=relation{tuple{v t}}")
36+
37+parseTutdIterate :: Parser String
38+parseTutdIterate = strOption (short 'i' <> long "iterate-tutd" <> value "update x (v:=not(@v))")
39+
40+main :: IO ()
41+main = do
42+ args <- execParser $ info (helper <*> parseArgs) fullDesc
43+ replicateM_ (openCloseCount args) (runOpenClose
44+ (T.pack (tutdSetup args))
45+ (T.pack (tutdIterate args))
46+ (transactionCount args)
47+ (dbdir args))
48+
49+runOpenClose :: T.Text -> T.Text -> Int -> FilePath -> IO ()
50+runOpenClose tutdSetup' tutdIterate' tCount dbdir' = do
51+ let connInfo = InProcessConnectionInfo (MinimalPersistence dbdir') emptyNotificationCallback []
52+ eConn <- connectProjectM36 connInfo
53+ case eConn of
54+ Left err -> error (show err)
55+ Right conn -> do
56+ eSess <- createSessionAtHead conn "master"
57+ case eSess of
58+ Left err -> error (show err)
59+ Right session ->
60+ --database setup
61+ case parseTutorialD tutdSetup' of
62+ Left err -> error (show err)
63+ Right parsed -> do
64+ res <- evalTutorialD session conn UnsafeEvaluation parsed
65+ case res of
66+ DisplayErrorResult err -> error (T.unpack err)
67+ DisplayParseErrorResult _ err ->
68+#if MIN_VERSION_megaparsec(7,0,0)
69+ error (errorBundlePretty err)
70+#else
71+ error (parseErrorPretty err)
72+#endif
73+ _ -> do
74+ replicateM_ tCount (runTransaction tutdIterate' session conn)
75+ close conn
76+ printFdCount
77+
78+runTransaction :: T.Text -> SessionId -> Connection -> IO ()
79+runTransaction tutdIterate' sess conn =
80+ --run tutd on every iteration
81+ case parseTutorialD tutdIterate' of
82+ Left err -> error (show err)
83+ Right parsed -> do
84+ res <- evalTutorialD sess conn UnsafeEvaluation parsed
85+ case res of
86+ DisplayErrorResult err -> error (T.unpack err)
87+ DisplayParseErrorResult _ err ->
88+#if MIN_VERSION_megaparsec(7,0,0)
89+ error (errorBundlePretty err)
90+#else
91+ error (parseErrorPretty err)
92+#endif
93+ _ -> do
94+ eErr <- commit sess conn
95+ case eErr of
96+ Left err -> error (show err)
97+ Right _ -> printFdCount
src/bin/benchmark/Relation.hs+1−1
@@ -12,7 +12,7 @@ matrixRelation :: Int -> Int -> Either RelationalError Relation
1212matrixRelation attributeCount tupleCount = do
1313 let attrs = A.attributesFromList $ map (\c-> Attribute (T.pack $ "a" ++ show c) IntAtomType) [0 .. attributeCount-1]
1414 tuple tupleX = RelationTuple attrs (V.generate attributeCount (\_ -> IntAtom tupleX))
15− tuples = map (\c -> tuple c) [0 .. tupleCount]
15+ tuples = map tuple [0 .. tupleCount]
1616 mkRelationDeferVerify attrs (RelationTupleSet tuples)
1717
1818main :: IO ()
src/bin/benchmark/bigrel.hs+57−32
@@ -1,33 +1,41 @@
1−{-# LANGUAGE FlexibleInstances #-}
1+{-# LANGUAGE FlexibleInstances, CPP #-}
22{-# OPTIONS_GHC -fno-warn-orphans #-}
33import ProjectM36.Base
44import ProjectM36.Relation
55import ProjectM36.DateExamples
66import ProjectM36.Error
7+import ProjectM36.StaticOptimizer
78import qualified ProjectM36.Attribute as A
89import qualified Data.Text as T
9−import ProjectM36.Relation.Show.CSV
10+--import ProjectM36.Relation.Show.CSV
1011import ProjectM36.Relation.Show.HTML
11−import TutorialD.Interpreter.DatabaseContextExpr (interpretDatabaseContextExpr)
1212import ProjectM36.RelationalExpression
13−import qualified Data.HashSet as HS
14−import qualified Data.ByteString.Lazy.Char8 as BS
15−import qualified Data.IntMap as IM
16−import qualified Data.Hashable as Hash
13+import ProjectM36.TransactionGraph
14+--import qualified Data.HashSet as HS
15+--import qualified Data.ByteString.Lazy.Char8 as BS
16+--import qualified Data.IntMap as IM
17+--import qualified Data.Hashable as Hash
1718import qualified Data.Vector as V
1819import Options.Applicative
19−import qualified Data.Map as M
2020import qualified Data.Text.IO as TIO
2121import System.IO
22−import Control.Monad.State
2322import Control.DeepSeq
23+import Data.Text hiding (map)
24+import Data.Time.Clock
25+import Data.UUID.V4
26+#if __GLASGOW_HASKELL__ < 804
27+import Data.Monoid
28+#endif
2429
30+
31+{-
2532dumpcsv :: Relation -> IO ()
2633dumpcsv rel = case relationAsCSV rel of
27− Left err -> hPutStrLn stderr (show err)
34+ Left err -> hPrint stderr err
2835 Right bsData -> BS.putStrLn bsData
36+-}
2937
30−data BigrelArgs = BigrelArgs Int Int String
38+data BigrelArgs = BigrelArgs Int Int Text
3139
3240parseAttributeCount :: Parser Int
3341parseAttributeCount = option auto (short 'a' <> long "attribute-count")
@@ -39,7 +47,7 @@ parseTutD :: Parser String
3947parseTutD = strOption (short 'd' <> long "tutoriald")
4048
4149parseArgs :: Parser BigrelArgs
42−parseArgs = BigrelArgs <$> parseAttributeCount <*> parseTupleCount <*> parseTutD
50+parseArgs = BigrelArgs <$> parseAttributeCount <*> parseTupleCount <*> (pack <$> parseTutD)
4351
4452main :: IO ()
4553main = do
@@ -50,58 +58,75 @@ main = do
5058 --intmapMatrixRun
5159
5260matrixRun :: BigrelArgs -> IO ()
53−matrixRun (BigrelArgs attributeCount tupleCount tutd) = do
61+matrixRun (BigrelArgs attributeCount tupleCount tutd) =
5462 case matrixRelation attributeCount tupleCount of
55− Left err -> putStrLn (show err)
63+ Left err -> print err
5664 Right rel -> if tutd == "" then
5765 putStrLn "Done."
5866 else do
67+ now <- getCurrentTime
68+ tid <- nextRandom
5969 let setx = Assign "x" (ExistingRelation (force rel))
60− context = execState (evalContextExpr setx) dateExamples
61− interpreted = interpretDatabaseContextExpr context tutd
70+ graph = bootstrapTransactionGraph now tid dateExamples
71+ env = mkDatabaseContextEvalEnv tid graph
72+ eNewState = runDatabaseContextEvalMonad dateExamples env (optimizeAndEvalDatabaseContextExpr True setx)
6273 --plan = interpretRODatabaseContextOp context $ ":showplan " ++ tutd
6374 --displayOpResult plan
64− case interpreted of
65− Right context' -> TIO.putStrLn $ relationAsHTML ((relationVariables context') M.! "x")
66− Left err -> hPutStrLn stderr (show err)
67−
68−
75+ case eNewState of
76+ Right newState -> do
77+ let ctx = dbc_context newState
78+ Right x = optimizeAndEvalRelationalExpr env' (RelationVariable "x" ())
79+ env' = RelationalExprEnv ctx graph Nothing
80+ TIO.putStrLn $ relationAsHTML x
81+ Left err -> hPrint stderr err
82+
83+{-
6984intmapMatrixRun :: IO ()
7085intmapMatrixRun = do
7186 let matrix = intmapMatrixRelation 100 100000
72− putStrLn (show matrix)
87+ print matrix
88+-}
7389
7490--compare IntMap speed and size
7591--this is about 3 times faster (9 minutes) for 10x100000 and uses 800 MB
92+{-
7693intmapMatrixRelation :: Int -> Int -> HS.HashSet (IM.IntMap Atom)
7794intmapMatrixRelation attributeCount tupleCount = HS.fromList $ map mapper [0..tupleCount]
7895 where
79− mapper tupCount = IM.fromList $ map (\c-> (c, IntAtom tupCount)) [0..attributeCount]
80−
81−instance Hash.Hashable (IM.IntMap Atom) where
82− hashWithSalt salt tupMap = Hash.hashWithSalt salt (show tupMap)
96+ mapper tupCount = IM.fromList $ map (\c-> (c, IntAtom (fromIntegral tupCount))) [0..attributeCount]
97+-}
98+-- instance Hash.Hashable (IM.IntMap Atom) where
99+-- hashWithSalt salt tupMap = Hash.hashWithSalt salt (show tupMap)
83100
101+{-
84102vectorMatrixRun :: IO ()
85103vectorMatrixRun = do
86104 let matrix = vectorMatrixRelation 100 100000
87− putStrLn (show matrix)
105+ print matrix
106+-}
107+-- 20 s 90 MBs- a clear win- ideal size is 10 * 100000 * 8 bytes = 80 MB! without IntAtom wrapper
108+--with IntAtom wrapper: 1m12s 90 MB
109+{-
110+
88111
89112-- 20 s 90 MBs- a clear win- ideal size is 10 * 100000 * 8 bytes = 80 MB! without IntAtom wrapper
90113--with IntAtom wrapper: 1m12s 90 MB
114+{-
115+
91116vectorMatrixRelation :: Int -> Int -> HS.HashSet (V.Vector Atom)
92117vectorMatrixRelation attributeCount tupleCount = HS.fromList $ map mapper [0..tupleCount]
93118 where
94− mapper tupCount = V.replicate attributeCount (IntAtom tupCount)
95−
119+ mapper tupCount = V.replicate attributeCount (IntAtom (fromIntegral tupCount))
120+-}
96121instance Hash.Hashable (V.Vector Atom) where
97122 hashWithSalt salt vec = Hash.hashWithSalt salt (show vec)
98−
123+-}
99124-- returns a relation with tupleCount tuples with a set of integer attributes attributesCount long
100125-- this is useful for performance and resource usage testing
101126matrixRelation :: Int -> Int -> Either RelationalError Relation
102127matrixRelation attributeCount tupleCount = do
103128 let attrs = A.attributesFromList $ map (\c-> Attribute (T.pack $ "a" ++ show c) IntAtomType) [0 .. attributeCount-1]
104− tuple tupleX = RelationTuple attrs (V.generate attributeCount (\_ -> IntAtom tupleX))
105− tuples = map (\c -> tuple c) [0 .. tupleCount]
129+ tuple tupleX = RelationTuple attrs (V.generate attributeCount (\_ -> IntAtom (fromIntegral tupleX)))
130+ tuples = map tuple [0 .. tupleCount]
106131 mkRelationDeferVerify attrs (RelationTupleSet tuples)
107132
src/lib/ProjectM36/Arbitrary.hsnew file+127
@@ -0,0 +1,127 @@
1+{-# LANGUAGE ExistentialQuantification,FlexibleInstances,OverloadedStrings #-}
2+{-# OPTIONS_GHC -fno-warn-orphans #-}
3+
4+module ProjectM36.Arbitrary where
5+import ProjectM36.Base
6+import ProjectM36.Error
7+import ProjectM36.AtomFunctionError
8+import ProjectM36.AtomType
9+import ProjectM36.Attribute (atomType)
10+import ProjectM36.DataConstructorDef as DCD
11+import ProjectM36.DataTypes.Interval
12+import ProjectM36.Relation
13+import qualified Data.Vector as V
14+import Data.Text (Text)
15+import Test.QuickCheck
16+import Test.QuickCheck.Instances ()
17+import qualified Data.ByteString.Char8 as B
18+import Data.Time
19+import Control.Monad.Reader
20+
21+arbitrary' :: AtomType -> WithTCMap Gen (Either RelationalError Atom)
22+arbitrary' IntegerAtomType =
23+ Right . IntegerAtom <$> lift (arbitrary :: Gen Integer)
24+
25+arbitrary' (RelationAtomType attrs) = do
26+ tcMap <-ask
27+ maybeRel <- lift $ runReaderT (arbitraryRelation attrs (0,5)) tcMap
28+ case maybeRel of
29+ Left err -> pure $ Left err
30+ Right rel -> pure $ Right $ RelationAtom rel
31+
32+arbitrary' IntAtomType =
33+ Right . IntAtom <$> lift (arbitrary :: Gen Int)
34+
35+arbitrary' DoubleAtomType =
36+ Right . DoubleAtom <$> lift (arbitrary :: Gen Double)
37+
38+arbitrary' TextAtomType =
39+ Right . TextAtom <$> lift (arbitrary :: Gen Text)
40+
41+arbitrary' DayAtomType =
42+ Right . DayAtom <$> lift (arbitrary :: Gen Day)
43+
44+arbitrary' DateTimeAtomType =
45+ Right . DateTimeAtom <$> lift (arbitrary :: Gen UTCTime)
46+
47+arbitrary' ByteStringAtomType =
48+ Right . ByteStringAtom <$> lift (arbitrary :: Gen B.ByteString)
49+
50+arbitrary' BoolAtomType =
51+ Right . BoolAtom <$> lift (arbitrary :: Gen Bool)
52+
53+arbitrary' RelationalExprAtomType =
54+ pure (Right (RelationalExprAtom (ExistingRelation relationTrue))) -- don't bother with arbitrary relational expressions
55+
56+arbitrary' constructedAtomType@(ConstructedAtomType tcName tvMap)
57+ --special-casing for Interval type
58+ | isIntervalAtomType constructedAtomType = createArbitraryInterval (intervalSubType constructedAtomType)
59+ | otherwise = do
60+ tcMap <- ask
61+ let maybeTCons = findTypeConstructor tcName tcMap
62+ let eitherTCons = maybeToRight (NoSuchTypeConstructorName tcName) maybeTCons
63+ let eitherDCDefs = snd <$> eitherTCons
64+ let eitherGenDCDef = elements <$> eitherDCDefs
65+ case eitherGenDCDef of
66+ Left err -> pure $ Left err
67+ Right genDCDef -> do
68+ dcDef <- lift genDCDef
69+ case resolvedAtomTypesForDataConstructorDefArgs tcMap tvMap dcDef of
70+ Left err -> pure $ Left err
71+ Right atomTypes -> do
72+ let genListOfEitherAtom = mapM (\aTy->runReaderT (arbitrary' aTy) tcMap) atomTypes
73+ listOfEitherAtom <- lift genListOfEitherAtom
74+ let eitherListOfAtom = sequence listOfEitherAtom
75+ case eitherListOfAtom of
76+ Left err -> pure $ Left err
77+ Right listOfAtom -> pure $ Right $ ConstructedAtom (DCD.name dcDef) constructedAtomType listOfAtom
78+arbitrary' (TypeVariableType _) = error "arbitrary on type variable"
79+
80+maybeToRight :: b -> Maybe a -> Either b a
81+maybeToRight _ (Just x) = Right x
82+maybeToRight y Nothing = Left y
83+
84+arbitraryRelationTuple :: Attributes -> WithTCMap Gen (Either RelationalError RelationTuple)
85+arbitraryRelationTuple attris = do
86+ tcMap <- ask
87+ listOfMaybeAType <- lift $ mapM ((\aTy -> runReaderT (arbitrary' aTy) tcMap) . atomType) (V.toList (attributesVec attris))
88+ case sequence listOfMaybeAType of
89+ Left err -> pure $ Left err
90+ Right listOfAttr -> do
91+ let vectorOfAttr = V.fromList listOfAttr
92+ pure $ Right $ RelationTuple attris vectorOfAttr
93+
94+arbitraryWithRange :: Gen (Either RelationalError RelationTuple) -> Range -> Gen [Either RelationalError RelationTuple]
95+arbitraryWithRange genEitherTuple range = do
96+ num <- choose range
97+ vectorOf num genEitherTuple
98+
99+arbitraryRelation :: Attributes -> Range -> WithTCMap Gen (Either RelationalError Relation)
100+arbitraryRelation attris range = do
101+ tcMap <- ask
102+ let genEitherTuple = runReaderT (arbitraryRelationTuple attris) tcMap
103+ listOfEitherTuple <- lift $ arbitraryWithRange genEitherTuple range
104+ let eitherTupleList = sequence listOfEitherTuple
105+ case eitherTupleList of
106+ Left err -> pure $ Left err
107+ Right tupleList -> pure $ Right $ Relation attris $ RelationTupleSet tupleList
108+
109+type WithTCMap a = ReaderT TypeConstructorMapping a
110+
111+createArbitraryInterval :: AtomType -> WithTCMap Gen (Either RelationalError Atom)
112+createArbitraryInterval subType = if supportsInterval subType then do
113+ eBegin <- arbitrary' subType
114+ eEnd <- arbitrary' subType
115+ beginopen <- lift (arbitrary :: Gen Bool)
116+ endopen <- lift (arbitrary :: Gen Bool)
117+ case eBegin of
118+ Left err -> pure (Left err)
119+ Right begin ->
120+ case eEnd of
121+ Left err -> pure (Left err)
122+ Right end ->
123+ case createInterval begin end beginopen endopen of
124+ Left _ -> createArbitraryInterval subType
125+ Right val -> pure (Right val)
126+ else
127+ pure $ Left (ProjectM36.Error.AtomFunctionUserError (AtomTypeDoesNotSupportIntervalError (prettyAtomType subType)))
src/lib/ProjectM36/Atom.hs+26−16
@@ -1,36 +1,46 @@
11module ProjectM36.Atom where
22import ProjectM36.Base
33import ProjectM36.Error
4+import ProjectM36.DataTypes.Interval
45import qualified Data.Text as T
5−--import Data.Time.Calendar
6−--import Data.Time.Clock
7−--import Data.ByteString (ByteString)
8−import Text.Read
6+#if __GLASGOW_HASKELL__ < 804
7+import Data.Monoid
8+#endif
99
1010relationForAtom :: Atom -> Either RelationalError Relation
1111relationForAtom (RelationAtom rel) = Right rel
1212relationForAtom _ = Left $ AttributeIsNotRelationValuedError ""
1313
14−makeAtomFromText :: AttributeName -> AtomType -> T.Text -> Either RelationalError Atom
15−makeAtomFromText _ IntAtomType textIn = maybe ((Left . ParseError) textIn) (Right . IntAtom) (readMaybe (T.unpack textIn))
16−makeAtomFromText _ DoubleAtomType textIn = maybe ((Left . ParseError) textIn) (Right . DoubleAtom) (readMaybe (T.unpack textIn))
17−makeAtomFromText _ TextAtomType textIn = maybe ((Left . ParseError) textIn) (Right . TextAtom) (readMaybe (T.unpack textIn))
18−makeAtomFromText _ DayAtomType textIn = maybe ((Left . ParseError) textIn) (Right . DayAtom) (readMaybe (T.unpack textIn))
19−makeAtomFromText _ DateTimeAtomType textIn = maybe ((Left . ParseError) textIn) (Right . DateTimeAtom) (readMaybe (T.unpack textIn))
20−makeAtomFromText _ ByteStringAtomType textIn = maybe ((Left . ParseError) textIn) (Right . ByteStringAtom) (readMaybe (T.unpack textIn))
21−makeAtomFromText _ BoolAtomType textIn = maybe ((Left . ParseError) textIn) (Right . BoolAtom) (readMaybe (T.unpack textIn))
22−makeAtomFromText attrName _ _ = Left $ AtomTypeNotSupported attrName
23−
2414atomToText :: Atom -> T.Text
15+atomToText (IntegerAtom i) = (T.pack . show) i
2516atomToText (IntAtom i) = (T.pack . show) i
2617atomToText (DoubleAtom i) = (T.pack . show) i
27−atomToText (TextAtom i) = (T.pack . show) i --does this break quoting in CSV export?
18+atomToText (TextAtom i) = (T.pack . show) i --quotes necessary for ConstructedAtom subatoms
2819atomToText (DayAtom i) = (T.pack . show) i
2920atomToText (DateTimeAtom i) = (T.pack . show) i
3021atomToText (ByteStringAtom i) = (T.pack . show) i
3122atomToText (BoolAtom i) = (T.pack . show) i
23+atomToText (RelationalExprAtom re) = (T.pack . show) re
24+
3225atomToText (RelationAtom i) = (T.pack . show) i
33−atomToText (ConstructedAtom dConsName _ atoms) = dConsName `T.append` T.intercalate " " (map atomToText atoms)
26+atomToText (ConstructedAtom dConsName typ atoms)
27+ | isIntervalAtomType typ = case atoms of --special handling for printing intervals
28+ [b, e, BoolAtom bo, BoolAtom be] ->
29+ let beginp = if bo then "(" else "["
30+ begin = atomToText b
31+ end = atomToText e
32+ endp = if be then ")" else "]" in
33+ beginp <> begin <> "," <> end <> endp
34+ _ -> "invalid interval"
35+ | otherwise = dConsName <> dConsArgs
36+ where
37+ parensAtomToText a@(ConstructedAtom _ _ []) = atomToText a
38+ parensAtomToText a@ConstructedAtom{} = "(" <> atomToText a <> ")"
39+ parensAtomToText a = atomToText a
40+
41+ dConsArgs = case atoms of
42+ [] -> ""
43+ args -> " " <> T.intercalate " " (map parensAtomToText args)
3444
3545
3646
src/lib/ProjectM36/AtomFunction.hs+72−5
@@ -1,15 +1,25 @@
1+{-# LANGUAGE CPP #-}
12module ProjectM36.AtomFunction where
23import ProjectM36.Base
4+import ProjectM36.Serialise.Base ()
35import ProjectM36.Error
6+import ProjectM36.Relation
7+import ProjectM36.AtomType
8+import ProjectM36.AtomFunctionError
9+import ProjectM36.ScriptSession
410import qualified ProjectM36.Attribute as A
511import qualified Data.HashSet as HS
12+import qualified Data.Text as T
13+import qualified Data.ByteString.Lazy as BL
14+import Codec.Winery
615
716foldAtomFuncType :: AtomType -> AtomType -> [AtomType]
17+--the underscore in the attribute name means that any attributes are acceptable
818foldAtomFuncType foldType returnType = [RelationAtomType (A.attributesFromList [Attribute "_" foldType]), returnType]
919
1020atomFunctionForName :: AtomFunctionName -> AtomFunctions -> Either RelationalError AtomFunction
1121atomFunctionForName funcName funcSet = if HS.null foundFunc then
12− Left $ NoSuchTupleExprFunctionError funcName
22+ Left $ NoSuchFunctionError funcName
1323 else
1424 Right $ head $ HS.toList foundFunc
1525 where
@@ -18,8 +28,8 @@ atomFunctionForName funcName funcSet = if HS.null foundFunc then
1828-- | Create a junk named atom function for use with searching for an already existing function in the AtomFunctions HashSet.
1929emptyAtomFunction :: AtomFunctionName -> AtomFunction
2030emptyAtomFunction name = AtomFunction { atomFuncName = name,
21− atomFuncType = [AnyAtomType, AnyAtomType],
22− atomFuncBody = AtomFunctionBody Nothing (\(x:_) -> x) }
31+ atomFuncType = [TypeVariableType "a", TypeVariableType "a"],
32+ atomFuncBody = AtomFunctionBody Nothing (\(x:_) -> pure x) }
2333
2434
2535-- | AtomFunction constructor for compiled-in functions.
@@ -29,6 +39,63 @@ compiledAtomFunction name aType body = AtomFunction { atomFuncName = name,
2939 atomFuncBody = AtomFunctionBody Nothing body }
3040
3141--the atom function really should offer some way to return an error
32−evalAtomFunction :: AtomFunction -> [Atom] -> Atom
42+evalAtomFunction :: AtomFunction -> [Atom] -> Either AtomFunctionError Atom
3343evalAtomFunction func args = case atomFuncBody func of
34− (AtomFunctionBody _ f) -> f args
44+ (AtomFunctionBody _ f) -> f args
45+
46+--expect "Int -> Either AtomFunctionError Int"
47+--return "Int -> Int" for funcType
48+extractAtomFunctionType :: [TypeConstructor] -> Either RelationalError [TypeConstructor]
49+extractAtomFunctionType typeIn = do
50+ let atomArgs = take (length typeIn - 1) typeIn
51+ --expected atom ret value - used to make funcType
52+ lastArg = take 1 (reverse typeIn)
53+ case lastArg of
54+ [ADTypeConstructor "Either"
55+ [ADTypeConstructor "AtomFunctionError" [],
56+ atomRetArg]] ->
57+ pure (atomArgs ++ [atomRetArg])
58+ otherType ->
59+ Left (ScriptError (TypeCheckCompilationError "function returning \"Either AtomFunctionError a\"" (show otherType)))
60+
61+isScriptedAtomFunction :: AtomFunction -> Bool
62+isScriptedAtomFunction func = case atomFuncBody func of
63+ AtomFunctionBody (Just _) _ -> True
64+ AtomFunctionBody Nothing _ -> False
65+
66+atomFunctionScript :: AtomFunction -> Maybe AtomFunctionBodyScript
67+atomFunctionScript func = case atomFuncBody func of
68+ AtomFunctionBody script _ -> script
69+
70+-- | Create a 'DatabaseContextIOExpr' which can be used to load a new atom function written in Haskell and loaded at runtime.
71+createScriptedAtomFunction :: AtomFunctionName -> [TypeConstructor] -> TypeConstructor -> AtomFunctionBodyScript -> DatabaseContextIOExpr
72+createScriptedAtomFunction funcName argsType retType = AddAtomFunction funcName (
73+ argsType ++ [ADTypeConstructor "Either" [
74+ ADTypeConstructor "AtomFunctionError" [],
75+ retType]])
76+
77+loadAtomFunctions :: ModName -> FuncName -> FilePath -> IO (Either LoadSymbolError [AtomFunction])
78+#ifdef PM36_HASKELL_SCRIPTING
79+loadAtomFunctions = loadFunction
80+#else
81+loadAtomFunctions _ _ _ = pure (Left LoadSymbolError)
82+#endif
83+
84+atomFunctionsAsRelation :: AtomFunctions -> Either RelationalError Relation
85+atomFunctionsAsRelation funcs = mkRelationFromList attrs tups
86+ where tups = map atomFuncToTuple (HS.toList funcs)
87+ attrs = A.attributesFromList [Attribute "name" TextAtomType,
88+ Attribute "arguments" TextAtomType]
89+ atomFuncToTuple aFunc = [TextAtom (atomFuncName aFunc),
90+ TextAtom (atomFuncTypeToText aFunc)]
91+ atomFuncTypeToText aFunc = T.intercalate " -> " (map prettyAtomType (atomFuncType aFunc))
92+
93+--for calculating the merkle hash
94+hashBytes :: AtomFunction -> BL.ByteString
95+hashBytes func = BL.fromChunks [serialise (atomFuncName func),
96+ serialise (atomFuncType func),
97+ bodyBin
98+ ]
99+ where
100+ bodyBin = case atomFuncBody func of
101+ AtomFunctionBody mScript _ -> serialise mScript
src/lib/ProjectM36/AtomFunctionBody.hs+1−134
@@ -2,139 +2,6 @@
22--tools to execute an atom function body
33module ProjectM36.AtomFunctionBody where
44import ProjectM36.Base
5−import ProjectM36.Error
6−
7−import Control.Monad.IO.Class
8−import Control.Exception
9−import Data.Text hiding (map)
10−
11−import Unsafe.Coerce
12−import GHC
13−import GHC.Paths (libdir)
14−import DynFlags
15−import Outputable hiding ((<>))
16−import PprTyThing
17−import Type hiding (pprTyThing)
18−import System.FilePath.Glob
19−
20−data ScriptSession = ScriptSession {
21− hscEnv :: HscEnv,
22− atomFunctionBodyType :: Type
23− }
24−
25−-- | Configure a GHC environment/session which we will use for all script compilation.
26−initScriptSession :: [String] -> IO ScriptSession
27−initScriptSession ghcPkgPaths = do
28− --for the sake of convenience, for developers' builds, include the local cabal sandbox pacakge database
29− sandboxPkgPaths <- liftIO (glob ".cabal-sandbox/*packages.conf.d")
30− runGhc (Just libdir) $ do
31− dflags <- getSessionDynFlags
32− let localPkgPaths = map PkgConfFile (ghcPkgPaths ++ sandboxPkgPaths)
33−
34− let dflags' = dflags { hscTarget = HscInterpreted ,
35− ghcLink = LinkInMemory,
36− safeHaskell = Sf_Trustworthy,
37− safeInfer = True,
38− safeInferred = True,
39− --trustFlags = [TrustPackage "base"] -- new in 8
40− packageFlags = (packageFlags dflags) ++ packages,
41− extraPkgConfs = const ([GlobalPkgConf, UserPkgConf] ++ localPkgPaths)
42− }
43− `xopt_set` Opt_ExtendedDefaultRules
44− `xopt_set` Opt_ImplicitPrelude
45− `xopt_set` Opt_OverloadedStrings
46− `gopt_set` Opt_DistrustAllPackages
47− `xopt_set` Opt_ScopedTypeVariables
48− `gopt_set` Opt_PackageTrust
49− --`gopt_set` Opt_ImplicitImportQualified
50− packages = map TrustPackage ["base",
51− "containers",
52− "unordered-containers",
53− "hashable",
54− "uuid",
55− "vector",
56− "text",
57− "binary",
58− "vector-binary-instances",
59− "time",
60− "project-m36",
61− "bytestring"] -- package flags changed in 8.0
62− _ <- setSessionDynFlags dflags'
63− let safeImportDecl mn = ImportDecl {
64− ideclSourceSrc = Nothing,
65− ideclName = noLoc mn,
66− ideclPkgQual = Nothing,
67− ideclSource = False,
68− ideclSafe = True,
69− ideclImplicit = False,
70− ideclQualified = False,
71− ideclAs = Nothing,
72− ideclHiding = Nothing
73− }
74− setContext (map (\modn -> IIDecl $ safeImportDecl (mkModuleName modn))
75− ["Prelude",
76− "Data.Map",
77− "ProjectM36.Base"])
78− env <- getSession
79− fType <- mkAtomFunctionBodyType
80− pure (ScriptSession env fType)
81−
82−mkAtomFunctionBodyType :: Ghc Type
83−mkAtomFunctionBodyType = do
84− lBodyName <- parseName "AtomFunctionBodyType"
85− case lBodyName of
86− [] -> error "failed to parse AtomFunctionBodyType"
87− _:_:_ -> error "too many name matches"
88− bodyName:[] -> do
89− mThing <- lookupName bodyName
90− case mThing of
91− Nothing -> error "failed to find AtomFunctionBodyType"
92− Just (ATyCon tyCon) -> case synTyConRhs_maybe tyCon of
93− Just typ -> pure typ
94− Nothing -> error "AtomFunctionBodyType is not a type synonym"
95− Just _ -> error "failed to find type synonym AtomFunctionBodyType"
96−
97−addImport :: String -> Ghc ()
98−addImport moduleNam = do
99− ctx <- getContext
100− setContext ( (IIDecl $ simpleImportDecl (mkModuleName moduleNam)) : ctx )
101−
102−showType :: DynFlags -> Type -> String
103−showType dflags ty = showSDocForUser dflags alwaysQualify (pprTypeForUser ty)
104−
105−-- | Typecheck and validate the
106−typeCheckAtomFunctionScript :: Type -> AtomFunctionBodyScript -> Ghc (Maybe AtomFunctionBodyCompilationError)
107−typeCheckAtomFunctionScript expectedType inp = do
108− dflags <- getSessionDynFlags
109− --catch exception for SyntaxError
110− funcType <- GHC.exprType (unpack inp)
111−
112− if eqType funcType expectedType then
113− pure Nothing
114− else
115− pure (Just (TypeCheckCompilationError (showType dflags expectedType) (showType dflags funcType)))
116−
117−-- | After compiling the script, it must accept a list of Atoms and return an Atom, otherwise an AtomFunctionBodyCompilationError is returned
118−compileAtomFunctionScript :: ScriptSession -> AtomFunctionBodyScript -> Ghc (Either AtomFunctionBodyCompilationError AtomFunctionBodyType)
119−compileAtomFunctionScript (ScriptSession _ funcType) script = do
120− let sScript = unpack script
121− mErr <- typeCheckAtomFunctionScript funcType script
122− case mErr of
123− Just err -> pure (Left err)
124− Nothing -> do
125− --catch exception here
126− --we could potentially wrap the script with Atom pattern matching so that the script doesn't have to do it, but the change to an Atom ADT should make it easier. Still, it would be nice if the script didn't have to handle a list of arguments, for example.
127− -- we can't use dynCompileExpr here because
128− func <- compileExpr sScript
129− pure $ Right (unsafeCoerce func)
130−
131−catchCompileException :: MonadIO m => IO a -> m (Either AtomFunctionBodyCompilationError a)
132−catchCompileException m = liftIO $ do
133− mres <- try m
134− case mres of
135− Left (err :: SomeException) -> do
136− pure (Left (OtherScriptCompilationError (show err)))
137− Right res -> pure (Right res)
1385
1396compiledAtomFunctionBody :: AtomFunctionBodyType -> AtomFunctionBody
140−compiledAtomFunctionBody func = AtomFunctionBody Nothing func
7+compiledAtomFunctionBody = AtomFunctionBody Nothing
src/lib/ProjectM36/AtomFunctionError.hsnew file+17
@@ -0,0 +1,17 @@
1+{-# LANGUAGE DeriveGeneric, DeriveAnyClass #-}
2+module ProjectM36.AtomFunctionError where
3+import GHC.Generics
4+import Control.DeepSeq
5+import Data.Text
6+
7+data AtomFunctionError = AtomFunctionUserError String |
8+ AtomFunctionTypeMismatchError |
9+ InvalidIntervalOrderingError |
10+ InvalidIntervalBoundariesError |
11+ InvalidIntBoundError |
12+ AtomFunctionEmptyRelationError |
13+ AtomTypeDoesNotSupportOrderingError Text |
14+ AtomTypeDoesNotSupportIntervalError Text |
15+ AtomFunctionBytesDecodingError String
16+ deriving(Generic, Eq, Show, NFData)
17+
src/lib/ProjectM36/AtomFunctionUtils.hsnew file+4
@@ -0,0 +1,4 @@
1+--convenience functions useful from with AtomFunctions
2+module ProjectM36.AtomFunctionUtils where
3+import ProjectM36.Base
4+
src/lib/ProjectM36/AtomFunctions/Basic.hs+15−1
@@ -4,12 +4,26 @@ import ProjectM36.Base
44import ProjectM36.DataTypes.Day
55import ProjectM36.DataTypes.Either
66import ProjectM36.DataTypes.Maybe
7+import ProjectM36.DataTypes.Interval
8+import ProjectM36.DataTypes.ByteString
9+import ProjectM36.DataTypes.NonEmptyList
710import ProjectM36.AtomFunctions.Primitive
11+import ProjectM36.AtomFunction
12+import ProjectM36.DataTypes.List
13+import ProjectM36.DataTypes.DateTime
814import qualified Data.HashSet as HS
915
1016basicAtomFunctions :: AtomFunctions
1117basicAtomFunctions = HS.unions [primitiveAtomFunctions,
1218 dayAtomFunctions,
19+ dateTimeAtomFunctions,
1320 eitherAtomFunctions,
14− maybeAtomFunctions]
21+ maybeAtomFunctions,
22+ listAtomFunctions,
23+ nonEmptyListAtomFunctions,
24+ bytestringAtomFunctions,
25+ intervalAtomFunctions]
1526
27+--these special atom functions aren't scripted so they can't be serialized normally. Instead, the body remains in the binary and the serialization/deserialization happens by name only.
28+precompiledAtomFunctions :: AtomFunctions
29+precompiledAtomFunctions = HS.filter (not . isScriptedAtomFunction) basicAtomFunctions
src/lib/ProjectM36/AtomFunctions/Primitive.hs+58−47
@@ -1,88 +1,99 @@
11module ProjectM36.AtomFunctions.Primitive where
22import ProjectM36.Base
3−import ProjectM36.Relation (relFold)
3+import ProjectM36.Relation (relFold, oneTuple)
44import ProjectM36.Tuple
5+import ProjectM36.AtomFunctionError
56import ProjectM36.AtomFunction
67import qualified Data.HashSet as HS
78import qualified Data.Vector as V
8−import qualified Data.ByteString.Base64 as B64
9−import qualified Data.Text.Encoding as TE
9+import Control.Monad
1010
1111primitiveAtomFunctions :: AtomFunctions
1212primitiveAtomFunctions = HS.fromList [
1313 --match on any relation type
1414 AtomFunction { atomFuncName = "add",
15− atomFuncType = [IntAtomType, IntAtomType, IntAtomType],
16− atomFuncBody = body (\((IntAtom i1):(IntAtom i2):_) -> IntAtom $ i1 + i2)},
15+ atomFuncType = [IntegerAtomType, IntegerAtomType, IntegerAtomType],
16+ atomFuncBody = body (\(IntegerAtom i1:IntegerAtom i2:_) -> pure (IntegerAtom (i1 + i2)))},
1717 AtomFunction { atomFuncName = "id",
18− atomFuncType = [AnyAtomType, AnyAtomType],
19− atomFuncBody = body (\(x:_) -> x)},
18+ atomFuncType = [TypeVariableType "a", TypeVariableType "a"],
19+ atomFuncBody = body (\(x:_) -> pure x)},
2020 AtomFunction { atomFuncName = "sum",
21− atomFuncType = foldAtomFuncType IntAtomType IntAtomType,
21+ atomFuncType = foldAtomFuncType IntegerAtomType IntegerAtomType,
2222 atomFuncBody = body (\(RelationAtom rel:_) -> relationSum rel)},
2323 AtomFunction { atomFuncName = "count",
24− atomFuncType = foldAtomFuncType AnyAtomType IntAtomType,
25− atomFuncBody = body (\((RelationAtom relIn):_) -> relationCount relIn)},
24+ atomFuncType = foldAtomFuncType (TypeVariableType "a") IntegerAtomType,
25+ atomFuncBody = body (\(RelationAtom relIn:_) -> relationCount relIn)},
2626 AtomFunction { atomFuncName = "max",
27− atomFuncType = foldAtomFuncType IntAtomType IntAtomType,
28− atomFuncBody = body (\((RelationAtom relIn):_) -> relationMax relIn)},
27+ atomFuncType = foldAtomFuncType IntegerAtomType IntegerAtomType,
28+ atomFuncBody = body (\(RelationAtom relIn:_) -> relationMax relIn)},
2929 AtomFunction { atomFuncName = "min",
30− atomFuncType = foldAtomFuncType IntAtomType IntAtomType,
31− atomFuncBody = body (\((RelationAtom relIn):_) -> relationMin relIn)},
30+ atomFuncType = foldAtomFuncType IntegerAtomType IntegerAtomType,
31+ atomFuncBody = body (\(RelationAtom relIn:_) -> relationMin relIn)},
3232 AtomFunction { atomFuncName = "lt",
33− atomFuncType = [IntAtomType, IntAtomType, BoolAtomType],
34− atomFuncBody = body $ intAtomFuncLessThan False},
33+ atomFuncType = [IntegerAtomType, IntegerAtomType, BoolAtomType],
34+ atomFuncBody = body $ integerAtomFuncLessThan False},
3535 AtomFunction { atomFuncName = "lte",
36− atomFuncType = [IntAtomType, IntAtomType, BoolAtomType],
37− atomFuncBody = body $ intAtomFuncLessThan True},
36+ atomFuncType = [IntegerAtomType, IntegerAtomType, BoolAtomType],
37+ atomFuncBody = body $ integerAtomFuncLessThan True},
3838 AtomFunction { atomFuncName = "gte",
39− atomFuncType = [IntAtomType, IntAtomType, BoolAtomType],
40− atomFuncBody = body $ boolAtomNot . (:[]) . intAtomFuncLessThan False},
39+ atomFuncType = [IntegerAtomType, IntegerAtomType, BoolAtomType],
40+ atomFuncBody = body $ integerAtomFuncLessThan False >=> boolAtomNot},
4141 AtomFunction { atomFuncName = "gt",
42− atomFuncType = [IntAtomType, IntAtomType, BoolAtomType],
43− atomFuncBody = body $ boolAtomNot . (:[]) . intAtomFuncLessThan True},
42+ atomFuncType = [IntegerAtomType, IntegerAtomType, BoolAtomType],
43+ atomFuncBody = body $ integerAtomFuncLessThan True >=> boolAtomNot},
4444 AtomFunction { atomFuncName = "not",
4545 atomFuncType = [BoolAtomType, BoolAtomType],
46− atomFuncBody = body boolAtomNot},
47− AtomFunction { atomFuncName = "makeByteString",
48− atomFuncType = [TextAtomType, ByteStringAtomType],
49− --I need a proper error-handling scheme for AtomFunctions!
50− atomFuncBody = body $ \((TextAtom textIn):_) -> ByteStringAtom $ (B64.decodeLenient . TE.encodeUtf8) textIn }
46+ atomFuncBody = body $ \(b:_) -> boolAtomNot b },
47+ AtomFunction { atomFuncName = "int",
48+ atomFuncType = [IntegerAtomType, IntAtomType],
49+ atomFuncBody = body $ \(IntegerAtom v:_) -> if v < fromIntegral (maxBound :: Int) then
50+ pure (IntAtom (fromIntegral v))
51+ else
52+ Left InvalidIntBoundError
53+ }
54+
5155 ]
5256 where
5357 body = AtomFunctionBody Nothing
5458
55−intAtomFuncLessThan :: Bool -> [Atom] -> Atom
56−intAtomFuncLessThan equality ((IntAtom i1):(IntAtom i2):_) = BoolAtom $ i1 `op` i2
59+integerAtomFuncLessThan :: Bool -> [Atom] -> Either AtomFunctionError Atom
60+integerAtomFuncLessThan equality (IntegerAtom i1:IntegerAtom i2:_) = pure (BoolAtom (i1 `op` i2))
5761 where
5862 op = if equality then (<=) else (<)
59−intAtomFuncLessThan _ _= BoolAtom False
63+integerAtomFuncLessThan _ _= pure (BoolAtom False)
6064
61−boolAtomNot :: [Atom] -> Atom
62−boolAtomNot ((BoolAtom b):_) = BoolAtom $ not b
63−boolAtomNot _ = BoolAtom False
65+boolAtomNot :: Atom -> Either AtomFunctionError Atom
66+boolAtomNot (BoolAtom b) = pure (BoolAtom (not b))
67+boolAtomNot _ = error "boolAtomNot called on non-Bool atom"
6468
6569--used by sum atom function
66−relationSum :: Relation -> Atom
67−relationSum relIn = IntAtom $ relFold (\tupIn acc -> acc + (newVal tupIn)) 0 relIn
70+relationSum :: Relation -> Either AtomFunctionError Atom
71+relationSum relIn = pure (IntegerAtom (relFold (\tupIn acc -> acc + newVal tupIn) 0 relIn))
6872 where
69− --extract Int from Atom
70− newVal :: RelationTuple -> Int
71− newVal tupIn = castInt ((tupleAtoms tupIn) V.! 0)
73+ --extract Integer from Atom
74+ newVal tupIn = castInteger (tupleAtoms tupIn V.! 0)
7275
73−relationCount :: Relation -> Atom
74−relationCount relIn = IntAtom $ relFold (\_ acc -> acc + 1) (0::Int) relIn
76+relationCount :: Relation -> Either AtomFunctionError Atom
77+relationCount relIn = pure (IntegerAtom (relFold (\_ acc -> acc + 1) (0::Integer) relIn))
7578
76−relationMax :: Relation -> Atom
77−relationMax relIn = IntAtom $ relFold (\tupIn acc -> max acc (newVal tupIn)) minBound relIn
79+relationMax :: Relation -> Either AtomFunctionError Atom
80+relationMax relIn = case oneTuple relIn of
81+ Nothing -> Left AtomFunctionEmptyRelationError
82+ Just oneTup -> pure (IntegerAtom (relFold (\tupIn acc -> max acc (newVal tupIn)) (newVal oneTup) relIn))
7883 where
79− newVal tupIn = castInt ((tupleAtoms tupIn) V.! 0)
84+ newVal tupIn = castInteger (tupleAtoms tupIn V.! 0)
8085
81−relationMin :: Relation -> Atom
82−relationMin relIn = IntAtom $ relFold (\tupIn acc -> min acc (newVal tupIn)) maxBound relIn
86+relationMin :: Relation -> Either AtomFunctionError Atom
87+relationMin relIn = case oneTuple relIn of
88+ Nothing -> Left AtomFunctionEmptyRelationError
89+ Just oneTup -> pure (IntegerAtom (relFold (\tupIn acc -> min acc (newVal tupIn)) (newVal oneTup) relIn))
8390 where
84− newVal tupIn = castInt ((tupleAtoms tupIn) V.! 0)
91+ newVal tupIn = castInteger (tupleAtoms tupIn V.! 0)
8592
8693castInt :: Atom -> Int
8794castInt (IntAtom i) = i
88−castInt _ = error "attempted to cast non-IntAtom to Int"
95+castInt _ = error "attempted to cast non-IntAtom to Int"
96+
97+castInteger :: Atom -> Integer
98+castInteger (IntegerAtom i) = i
99+castInteger _ = error "attempted to cast non-IntegerAtom to Int"
src/lib/ProjectM36/AtomType.hs+290−100
@@ -6,19 +6,19 @@ import qualified ProjectM36.DataConstructorDef as DCD
66import ProjectM36.MiscUtils
77import ProjectM36.Error
88import ProjectM36.DataTypes.Primitive
9+import ProjectM36.AttributeExpr as AE
910import qualified ProjectM36.Attribute as A
1011import qualified Data.Vector as V
1112import qualified Data.Set as S
1213import qualified Data.List as L
1314import Data.Maybe (isJust)
14−import Data.Either (rights)
15+import Data.Either (rights, lefts)
1516import Control.Monad.Writer
1617import qualified Data.Map as M
1718import qualified Data.Text as T
18−--import Debug.Trace
1919
2020findDataConstructor :: DataConstructorName -> TypeConstructorMapping -> Maybe (TypeConstructorDef, DataConstructorDef)
21−findDataConstructor dName tConsList = foldr tConsFolder Nothing tConsList
21+findDataConstructor dName = foldr tConsFolder Nothing
2222 where
2323 tConsFolder (tCons, dConsList) accum = if isJust accum then
2424 accum
@@ -31,65 +31,65 @@ findDataConstructor dName tConsList = foldr tConsFolder Nothing tConsList
3131 [dCons] -> Just dCons
3232 _ -> error "More than one data constructor with the same name found"
3333
34+{-
3435-- | Scan the atom types and return the resultant ConstructedAtomType or error.
3536-- Used in typeFromAtomExpr to validate argument types.
3637atomTypeForDataConstructorName :: DataConstructorName -> [AtomType] -> TypeConstructorMapping -> Either RelationalError AtomType
3738-- search for the data constructor and resolve the types' names
38−atomTypeForDataConstructorName dConsName atomTypesIn tConsList = do
39+atomTypeForDataConstructorName dConsName atomTypesIn tConsList =
3940 case findDataConstructor dConsName tConsList of
4041 Nothing -> Left (NoSuchDataConstructorError dConsName)
4142 Just (tCons, dCons) -> do
42− typeVars <- resolveDataConstructorTypeVars dCons atomTypesIn tConsList
43− pure (ConstructedAtomType (TCD.name tCons) typeVars)
43+ dConsVars <- resolveDataConstructorTypeVars dCons atomTypesIn tConsList
44+ let tConsVars = M.fromList (map TypeVariableType (TCD.typeVars tCons))
45+ allVars = M.union dConsVars tConsVars
46+ ConstructedAtomType (TCD.name tCons) <$> allVars
47+-}
4448
45−atomTypeForDataConstructorDefArg :: DataConstructorDefArg -> AtomType -> TypeConstructorMapping -> Either RelationalError AtomType
46−atomTypeForDataConstructorDefArg (DataConstructorDefTypeConstructorArg tCons) aType tConss =
47− case isValidAtomTypeForTypeConstructor aType tCons tConss of
48− Just err -> Left err
49− Nothing -> Right aType
49+atomTypeForDataConstructorDefArg :: DataConstructorDefArg -> AtomType -> TypeConstructorMapping -> Either RelationalError AtomType
50+atomTypeForDataConstructorDefArg (DataConstructorDefTypeConstructorArg tCons) aType tConss = do
51+ isValidAtomTypeForTypeConstructor aType tCons tConss
52+ pure aType
5053
5154atomTypeForDataConstructorDefArg (DataConstructorDefTypeVarNameArg _) aType _ = Right aType --any type is OK
5255
53−isValidAtomTypeForTypeConstructorArg :: AtomType -> TypeConstructorArg -> TypeConstructorMapping -> Maybe RelationalError
54−isValidAtomTypeForTypeConstructorArg aType (TypeConstructorArg tCons) tConsList = isValidAtomTypeForTypeConstructor aType tCons tConsList
55−isValidAtomTypeForTypeConstructorArg _ (TypeConstructorTypeVarArg _) _ = Nothing
56−
57−--reconcile the atom-in types with the type constructors
58−isValidAtomTypeForTypeConstructor :: AtomType -> TypeConstructor -> TypeConstructorMapping -> Maybe RelationalError
59−isValidAtomTypeForTypeConstructor aType (PrimitiveTypeConstructor _ expectedAType) _ = if expectedAType /= aType then Just (AtomTypeMismatchError expectedAType aType) else Nothing
60−
61−--lookup constructor name and check if the incoming atom types are valid
62−isValidAtomTypeForTypeConstructor (ConstructedAtomType tConsName _) (ADTypeConstructor expectedTConsName _) _ = if tConsName /= expectedTConsName then Just (TypeConstructorNameMismatch expectedTConsName tConsName) else Nothing
63−
64−isValidAtomTypeForTypeConstructor aType tCons _ = Just (AtomTypeTypeConstructorReconciliationError aType (TC.name tCons))
65−
6656-- | Used to determine if the atom arguments can be used with the data constructor.
67−-- | This is the entry point for type-checking from RelationalExpression.hs.
57+-- | This is the entry point for type-checking from RelationalExpression.hs
6858atomTypeForDataConstructor :: TypeConstructorMapping -> DataConstructorName -> [AtomType] -> Either RelationalError AtomType
69−atomTypeForDataConstructor tConss dConsName atomArgTypes = do
59+atomTypeForDataConstructor tConss dConsName atomArgTypes =
7060 --lookup the data constructor
7161 case findDataConstructor dConsName tConss of
7262 Nothing -> Left (NoSuchDataConstructorError dConsName)
7363 Just (tCons, dCons) -> do
7464 --validate that the type constructor arguments are fulfilled in the data constructor
75− typeVars <- resolveDataConstructorTypeVars dCons atomArgTypes tConss
76− pure (ConstructedAtomType (TCD.name tCons) typeVars)
65+ dConsVars <- resolveDataConstructorTypeVars dCons atomArgTypes tConss
66+ let tConsVars = M.fromList (map (\v -> (v, TypeVariableType v)) (TCD.typeVars tCons))
67+ allVars = M.union dConsVars tConsVars
68+ unresolvedType = ConstructedAtomType (TCD.name tCons) allVars
69+ --validateAtomType unresolvedType tConss -- do not validate here because the type may not be fully resolved at this point
70+ pure unresolvedType
7771
7872-- | Walks the data and type constructors to extract the type variable map.
7973resolveDataConstructorTypeVars :: DataConstructorDef -> [AtomType] -> TypeConstructorMapping -> Either RelationalError TypeVarMap
80−resolveDataConstructorTypeVars dCons aTypeArgs tConss = do
81− maps <- mapM (\(dCons',aTypeArg) -> resolveDataConstructorArgTypeVars dCons' aTypeArg tConss) (zip (DCD.fields dCons) aTypeArgs)
74+resolveDataConstructorTypeVars dCons@(DataConstructorDef _ defArgs) aTypeArgs tConss = do
75+ let defCount = length defArgs
76+ argCount = length aTypeArgs
77+ if defCount /= argCount then
78+ Left (ConstructedAtomArgumentCountMismatchError defCount argCount)
79+ else do
80+ maps <- mapM (\(dCons',aTypeArg) -> resolveDataConstructorArgTypeVars dCons' aTypeArg tConss) (zip (DCD.fields dCons) aTypeArgs)
8281 --if any two maps have the same key and different values, this indicates a type arg mismatch
83− let typeVarMapFolder valMap acc = case acc of
84− Left err -> Left err
85− Right accMap -> if accMap `M.isSubmapOf` valMap then
86− Right (M.union accMap valMap)
87− else
88− Left (DataConstructorTypeVarsMismatch (DCD.name dCons) accMap valMap)
89− case foldr typeVarMapFolder (Right M.empty) maps of
90− Left err -> Left err
91− Right typeVarMaps -> pure typeVarMaps
92− --if the data constructor cannot complete a type constructor variables (ex. "Nothing" could be Maybe Int or Maybe Text, etc.), then fill that space with AnyAtomType which is resolved when the relation is constructed- the relation must contain all resolved atom types.
82+ let typeVarMapFolder valMap acc = case acc of
83+ Left err -> Left err
84+ Right accMap ->
85+ case resolveAtomTypesInTypeVarMap valMap accMap of
86+ Left (TypeConstructorTypeVarMissing _) -> Left (DataConstructorTypeVarsMismatch (DCD.name dCons) accMap valMap)
87+ Left err -> Left err
88+ Right ok -> pure ok
89+ case foldr typeVarMapFolder (Right M.empty) maps of
90+ Left err -> Left err
91+ Right typeVarMaps -> pure typeVarMaps
92+ --if the data constructor cannot complete a type constructor variables (ex. "Nothing" could be Maybe Int or Maybe Text, etc.), then fill that space with TypeVar which is resolved when the relation is constructed- the relation must contain all resolved atom types.
9393
9494
9595-- | Attempt to match the data constructor argument to a type constructor type variable.
@@ -113,58 +113,138 @@ resolveTypeConstructorTypeVars (ADTypeConstructor tConsName _) (ConstructedAtomT
113113 Nothing -> Left (NoSuchTypeConstructorName tConsName)
114114 Just (tConsDef, _) -> let expectedPVarNames = S.fromList (TCD.typeVars tConsDef) in
115115 if M.keysSet pVarMap' `S.isSubsetOf` expectedPVarNames then
116− Right pVarMap' -- I wish we could actually resolve this- we are creating temporary AtomTypes which are actually invalid until they are resolved with a second pass of type resolution- not great
116+ Right pVarMap'
117117 else
118118 Left (TypeConstructorTypeVarsMismatch expectedPVarNames (M.keysSet pVarMap'))
119−resolveTypeConstructorTypeVars _ _ _ = error "Unhandled type vars"
119+resolveTypeConstructorTypeVars (TypeVariable tvName) typ _ = case typ of
120+ TypeVariableType nam -> Left (TypeConstructorTypeVarMissing nam)
121+ _ -> Right (M.singleton tvName typ)
122+resolveTypeConstructorTypeVars (ADTypeConstructor tConsName []) typ tConss = case findTypeConstructor tConsName tConss of
123+ Just (PrimitiveTypeConstructorDef _ _, _) -> Right M.empty
124+ _ -> Left (TypeConstructorAtomTypeMismatch tConsName typ)
125+
126+resolveTypeConstructorTypeVars (ADTypeConstructor tConsName _) typ _ = Left (TypeConstructorAtomTypeMismatch tConsName typ)
127+
128+resolveTypeConstructorTypeVars (RelationAtomTypeConstructor attrExprs) typ tConsMap =
129+ case typ of
130+ RelationAtomType attrs ->
131+ --resolve any typevars in the attrExprs
132+ M.unions <$> mapM (\(expectedAtomType, attrExpr) -> resolveAttributeExprTypeVars attrExpr expectedAtomType tConsMap) (zip (A.atomTypesList attrs) attrExprs)
133+ otherType -> Left (AtomTypeMismatchError typ otherType)
134+
135+--used when recursing down sub-relation type definition
136+resolveAttributeExprTypeVars :: AttributeExprBase a -> AtomType -> TypeConstructorMapping -> Either RelationalError TypeVarMap
137+resolveAttributeExprTypeVars (NakedAttributeExpr attr) aType _ = pure $ resolveTypeVariable (A.atomType attr) aType
138+resolveAttributeExprTypeVars (AttributeAndTypeNameExpr _ tCons _) aType tConsMap = resolveTypeConstructorTypeVars tCons aType tConsMap
120139
121140-- check that type vars on the right also appear on the left
122141-- check that the data constructor names are unique
123−validateTypeConstructorDef :: TypeConstructorDef -> [DataConstructorDef] -> [RelationalError]
124−validateTypeConstructorDef tConsDef dConsList = execWriter $ do
142+validateTypeConstructorDef :: TypeConstructorDef -> [DataConstructorDef] -> TypeConstructorMapping -> Either RelationalError ()
143+validateTypeConstructorDef tConsDef dConsList tConsMap = do
125144 let duplicateDConsNames = dupes (L.sort (map DCD.name dConsList))
126− mapM_ tell [map DataConstructorNameInUseError duplicateDConsNames]
145+ unless (null duplicateDConsNames) (Left (someErrors (map DataConstructorNameInUseError duplicateDConsNames)))
127146 let leftSideVars = S.fromList (TCD.typeVars tConsDef)
128147 rightSideVars = S.unions (map DCD.typeVars dConsList)
129148 varsDiff = S.difference leftSideVars rightSideVars
130− mapM_ tell [map DataConstructorUsesUndeclaredTypeVariable (S.toList varsDiff)]
131− pure ()
132−
149+ when (S.size varsDiff > 0) (Left (someErrors (map DataConstructorUsesUndeclaredTypeVariable (S.toList varsDiff))))
150+ mapM_ (\dConsDef -> validateDataConstructorDef dConsDef tConsDef tConsMap) dConsList
151+
152+--check that the data constructor names are not in use (recursively)
153+validateDataConstructorDef :: DataConstructorDef -> TypeConstructorDef -> TypeConstructorMapping -> Either RelationalError ()
154+validateDataConstructorDef (DataConstructorDef dConsName dConsDefArgs) tConsDef tConsMap =
155+ case findDataConstructor dConsName tConsMap of
156+ Just _ -> Left (DataConstructorNameInUseError dConsName)
157+ Nothing ->
158+ mapM_ (\arg -> validateDataConstructorDefArg arg tConsDef tConsMap) dConsDefArgs
159+
160+
161+validateDataConstructorDefArg :: DataConstructorDefArg -> TypeConstructorDef -> TypeConstructorMapping -> Either RelationalError ()
162+validateDataConstructorDefArg (DataConstructorDefTypeConstructorArg (PrimitiveTypeConstructor _ _)) _ _ = Right ()
163+validateDataConstructorDefArg (DataConstructorDefTypeConstructorArg (TypeVariable _)) _ _ = Right ()
164+validateDataConstructorDefArg (DataConstructorDefTypeConstructorArg tCons) tConsDef tConsMap = case findTypeConstructor (TC.name tCons) tConsMap of
165+ Nothing ->
166+ when (TC.name tCons /= TCD.name tConsDef) (Left (NoSuchTypeConstructorName (TC.name tCons))) --allows for recursively-defined types
167+ Just (ADTypeConstructorDef _ tConsArgs, _) -> do --validate that the argument count matches- type matching can occur later
168+ let existingCount = length tConsArgs
169+ newCount = length (TC.arguments tCons)
170+ when (newCount /= existingCount) (Left (ConstructedAtomArgumentCountMismatchError existingCount newCount))
171+ Just (PrimitiveTypeConstructorDef _ _, _) -> pure ()
172+validateDataConstructorDefArg (DataConstructorDefTypeVarNameArg _) _ _ = Right ()
173+
174+atomTypeForTypeConstructor :: TypeConstructor -> TypeConstructorMapping -> TypeVarMap -> Either RelationalError AtomType
175+atomTypeForTypeConstructor = atomTypeForTypeConstructorValidate False
133176
134177-- | Create an atom type iff all type variables are provided.
135178-- Either Int Text -> ConstructedAtomType "Either" {Int , Text}
136−atomTypeForTypeConstructor :: TypeConstructor -> TypeConstructorMapping -> Either RelationalError AtomType
137−atomTypeForTypeConstructor (PrimitiveTypeConstructor _ aType) _ = Right aType
138−atomTypeForTypeConstructor tCons tConss = case findTypeConstructor (TC.name tCons) tConss of
179+atomTypeForTypeConstructorValidate :: Bool -> TypeConstructor -> TypeConstructorMapping -> TypeVarMap -> Either RelationalError AtomType
180+atomTypeForTypeConstructorValidate _ (PrimitiveTypeConstructor _ aType) _ _ = Right aType
181+atomTypeForTypeConstructorValidate validate (TypeVariable tvname) _ tvMap = case M.lookup tvname tvMap of
182+ Nothing -> if validate then
183+ Left (TypeConstructorTypeVarMissing tvname)
184+ else
185+ pure (TypeVariableType tvname)
186+ Just typ -> Right typ
187+atomTypeForTypeConstructorValidate _ (RelationAtomTypeConstructor attrExprs) tConsMap tvMap = do
188+ resolvedAtomTypes <- mapM (\expr -> atomTypeForAttributeExpr expr tConsMap tvMap) attrExprs
189+ let attrs = zipWith Attribute (map AE.attributeName attrExprs) resolvedAtomTypes
190+ pure (RelationAtomType (A.attributesFromList attrs))
191+atomTypeForTypeConstructorValidate val tCons tConss tvMap = case findTypeConstructor (TC.name tCons) tConss of
139192 Nothing -> Left (NoSuchTypeConstructorError (TC.name tCons))
193+ Just (PrimitiveTypeConstructorDef _ aType, _) -> Right aType
140194 Just (tConsDef, _) -> do
141− tConsArgTypes <- mapM ((flip atomTypeForTypeConstructorArg) tConss) (TC.arguments tCons)
142− let pVarNames = TCD.typeVars tConsDef
143− tConsArgs = M.fromList (zip pVarNames tConsArgTypes)
144− Right (ConstructedAtomType (TC.name tCons) tConsArgs)
145−
146−atomTypeForTypeConstructorArg :: TypeConstructorArg -> TypeConstructorMapping -> Either RelationalError AtomType
147−atomTypeForTypeConstructorArg (TypeConstructorTypeVarArg _) _ = Left IncompletelyDefinedAtomTypeWithConstructorError
148−atomTypeForTypeConstructorArg (TypeConstructorArg tCons) tConsList = atomTypeForTypeConstructor tCons tConsList
195+ tConsArgTypes <- mapM (\tConsArg -> atomTypeForTypeConstructorValidate val tConsArg tConss tvMap) (TC.arguments tCons)
196+ let pVarNames = TCD.typeVars tConsDef
197+ tConsArgs = M.fromList (zip pVarNames tConsArgTypes)
198+ Right (ConstructedAtomType (TC.name tCons) tConsArgs)
199+
200+
201+atomTypeForAttributeExpr :: AttributeExprBase a -> TypeConstructorMapping -> TypeVarMap -> Either RelationalError AtomType
202+atomTypeForAttributeExpr (NakedAttributeExpr attr) _ _ = pure (A.atomType attr)
203+atomTypeForAttributeExpr (AttributeAndTypeNameExpr _ tCons _) tConsMap tvMap = atomTypeForTypeConstructorValidate True tCons tConsMap tvMap
204+
205+--reconcile the atom-in types with the type constructors
206+isValidAtomTypeForTypeConstructor :: AtomType -> TypeConstructor -> TypeConstructorMapping -> Either RelationalError ()
207+isValidAtomTypeForTypeConstructor aType (PrimitiveTypeConstructor _ expectedAType) _ = if expectedAType /= aType then Left (AtomTypeMismatchError expectedAType aType) else pure ()
208+
209+--lookup constructor name and check if the incoming atom types are valid
210+isValidAtomTypeForTypeConstructor (ConstructedAtomType tConsName _) (ADTypeConstructor expectedTConsName _) _ = if tConsName /= expectedTConsName then Left (TypeConstructorNameMismatch expectedTConsName tConsName) else pure ()
211+
212+isValidAtomTypeForTypeConstructor (RelationAtomType attrs) (RelationAtomTypeConstructor attrExprs) tConsMap = do
213+ evaldAtomTypes <- mapM (\expr -> atomTypeForAttributeExpr expr tConsMap M.empty) attrExprs
214+ mapM_ (uncurry resolveAtomType) (zip (A.atomTypesList attrs) evaldAtomTypes)
215+isValidAtomTypeForTypeConstructor aType tCons _ = Left (AtomTypeTypeConstructorReconciliationError aType (TC.name tCons))
149216
150217findTypeConstructor :: TypeConstructorName -> TypeConstructorMapping -> Maybe (TypeConstructorDef, [DataConstructorDef])
151−findTypeConstructor name tConsList = foldr tConsFolder Nothing tConsList
218+findTypeConstructor name = foldr tConsFolder Nothing
152219 where
153220 tConsFolder (tCons, dConsList) accum = if TCD.name tCons == name then
154221 Just (tCons, dConsList)
155222 else
156223 accum
157−
224+
225+resolveAttributes :: Attribute -> Attribute -> Either RelationalError Attribute
226+resolveAttributes attrA attrB =
227+ if A.attributeName attrA /= A.attributeName attrB then
228+ Left $ AttributeNamesMismatchError (S.fromList (map A.attributeName [attrA, attrB]))
229+ else
230+ Attribute (A.attributeName attrA) <$> resolveAtomType (A.atomType attrA) (A.atomType attrB)
231+
232+--given two atom types, try to resolve type variables
158233resolveAtomType :: AtomType -> AtomType -> Either RelationalError AtomType
159−resolveAtomType (ConstructedAtomType tConsName resolvedTypeVarMap) (ConstructedAtomType _ unresolvedTypeVarMap) = do
160− tVarMap <- resolveAtomTypesInTypeVarMap resolvedTypeVarMap unresolvedTypeVarMap
161− pure (ConstructedAtomType tConsName tVarMap)
234+resolveAtomType (ConstructedAtomType tConsName resolvedTypeVarMap) (ConstructedAtomType _ unresolvedTypeVarMap) =
235+ ConstructedAtomType tConsName <$> resolveAtomTypesInTypeVarMap resolvedTypeVarMap unresolvedTypeVarMap
162236resolveAtomType typeFromRelation unresolvedType = if typeFromRelation == unresolvedType then
163237 Right typeFromRelation
164238 else
165239 Left (AtomTypeMismatchError typeFromRelation unresolvedType)
166240
167−-- this could be optimized to reduce new tuple creation- if anyatomtype does not appear, just return the original typevarmap
241+{-
242+--walk an `AtomType` and apply the type variables in the map
243+resolveAtomTypeVars :: TypeVarMap -> AtomType -> AtomType
244+resolveAtomTypeVars tvMap typ@(TypeVariableType nam) = fromMaybe typ (M.lookup nam tvMap)
245+resolveAtomTypeVars tvMap (RelationAtomType relAttrs) =
246+-}
247+-- this could be optimized to reduce new tuple creation
168248resolveAtomTypesInTypeVarMap :: TypeVarMap -> TypeVarMap -> Either RelationalError TypeVarMap
169249resolveAtomTypesInTypeVarMap resolvedTypeMap unresolvedTypeMap = do
170250 {-
@@ -177,37 +257,50 @@ resolveAtomTypesInTypeVarMap resolvedTypeMap unresolvedTypeMap = do
177257 Nothing -> Left (TypeConstructorTypeVarMissing key)
178258 Just val -> Right val
179259 -}
180− let resolveTypePair resKey resType = do
260+ let resolveTypePair resKey resType =
181261 -- if the key is missing in the unresolved type map, then fill it in with the value from the resolved map
182262 case M.lookup resKey unresolvedTypeMap of
183− Just unresType -> case unresType of
263+ Just unresType -> case unresType of
184264 --do we need to recurse for RelationAtomType?
185265 subType@(ConstructedAtomType _ _) -> do
186266 resSubType <- resolveAtomType resType subType
187267 pure (resKey, resSubType)
188− otherType -> pure (resKey, otherType)
189− Nothing -> do
268+ TypeVariableType _ -> pure (resKey, resType)
269+ typ -> if typ == resType then
270+ pure (resKey, resType)
271+ else
272+ Left $ AtomTypeMismatchError typ resType
273+ Nothing ->
190274 pure (resKey, resType) --swipe the missing type var from the expected map
191275 tVarList <- mapM (uncurry resolveTypePair) (M.toList resolvedTypeMap)
192276 pure (M.fromList tVarList)
193277
194278-- | See notes at `resolveTypesInTuple`. The typeFromRelation must not include any wildcards.
195−resolveTypeInAtom :: AtomType -> Atom -> Either RelationalError Atom
196−resolveTypeInAtom typeFromRelation atomIn@(ConstructedAtom dConsName _ args) = do
279+resolveTypeInAtom :: AtomType -> Atom -> TypeConstructorMapping -> Either RelationalError Atom
280+resolveTypeInAtom typeFromRelation@(ConstructedAtomType _ tvMap) atomIn@(ConstructedAtom dConsName _ args) tConss = do
197281 newType <- resolveAtomType typeFromRelation (atomTypeForAtom atomIn)
198− pure (ConstructedAtom dConsName newType args)
199−resolveTypeInAtom _ atom = Right atom
282+ case findDataConstructor dConsName tConss of
283+ Nothing -> -- the atom may have been constructed using a constructor function without a public data constructor, no further resolution is possible
284+ pure atomIn
285+ Just (_, dConsDef) -> do
286+ atomArgTypes <- resolvedAtomTypesForDataConstructorDefArgs tConss tvMap dConsDef
287+ newArgs <- mapM (\(atom, atomTyp) -> resolveTypeInAtom atomTyp atom tConss) (zip args atomArgTypes)
288+ pure (ConstructedAtom dConsName newType newArgs)
289+resolveTypeInAtom (RelationAtomType attrs) (RelationAtom (Relation _ tupSet)) tConss = do
290+ let newTups = mapM (resolveTypesInTuple attrs tConss) (asList tupSet)
291+ RelationAtom . Relation attrs . RelationTupleSet <$> newTups
292+resolveTypeInAtom _ atom _ = Right atom
200293
201−-- | When creating a tuple, the data constructor may not complete the type constructor arguments, so the wildcard "AnyAtomType" fills in the type constructor's argument. The tuple type must be resolved before it can be part of a relation, however.
294+-- | When creating a tuple, the data constructor may not complete the type constructor arguments, so the wildcard "TypeVar x" fills in the type constructor's argument. The tuple type must be resolved before it can be part of a relation, however.
202295-- Example: "Nothing" does not specify the the argument in "Maybe a", so allow delayed resolution in the tuple before it is added to the relation. Note that this resolution could cause a type error. Hardly a Hindley-Milner system.
203−resolveTypesInTuple :: Attributes -> RelationTuple -> Either RelationalError RelationTuple
204−resolveTypesInTuple resolvedAttrs (RelationTuple _ tupAtoms) = do
205− newAtoms <- mapM (\(atom, resolvedType) -> resolveTypeInAtom resolvedType atom) (zip (V.toList tupAtoms) $ (map A.atomType (V.toList resolvedAttrs)))
296+resolveTypesInTuple :: Attributes -> TypeConstructorMapping -> RelationTuple -> Either RelationalError RelationTuple
297+resolveTypesInTuple resolvedAttrs tConss (RelationTuple _ tupAtoms) = do
298+ newAtoms <- mapM (\(atom, resolvedType) -> resolveTypeInAtom resolvedType atom tConss) (zip (V.toList tupAtoms) $ A.atomTypesList resolvedAttrs)
206299 Right (RelationTuple resolvedAttrs (V.fromList newAtoms))
207300
208301-- | Validate that the type is provided with complete type variables for type constructors.
209302validateAtomType :: AtomType -> TypeConstructorMapping -> Either RelationalError ()
210−validateAtomType typ@(ConstructedAtomType tConsName tVarMap) tConss = do
303+validateAtomType typ@(ConstructedAtomType tConsName tVarMap) tConss =
211304 case findTypeConstructor tConsName tConss of
212305 Nothing -> Left (TypeConstructorAtomTypeMismatch tConsName typ)
213306 Just (tConsDef, _) -> case tConsDef of
@@ -217,50 +310,147 @@ validateAtomType typ@(ConstructedAtomType tConsName tVarMap) tConss = do
217310 if not (S.null diff) then
218311 Left $ TypeConstructorTypeVarsMismatch expectedTyVarNames actualTyVarNames
219312 else
220− Right ()
221− _ -> Right ()
222−validateAtomType _ _ = Right ()
313+ validateTypeVarMap tVarMap tConss
314+ _ -> Right ()
315+validateAtomType (RelationAtomType attrs) tConss =
316+ mapM_ (\attr ->
317+ validateAtomType (A.atomType attr) tConss) (attributesVec attrs)
318+validateAtomType (TypeVariableType x) _ = Left (TypeConstructorTypeVarMissing x)
319+validateAtomType _ _ = pure ()
320+
321+validateAttributes :: TypeConstructorMapping -> Attributes -> Either RelationalError ()
322+validateAttributes tConss attrs =
323+ if not (null errs) then
324+ Left (someErrors errs)
325+ else
326+ pure ()
327+ where
328+ errs = lefts $ map (`validateAtomType` tConss) (A.atomTypesList attrs)
329+
330+--ensure that all type vars are fully resolved
331+validateTypeVarMap :: TypeVarMap -> TypeConstructorMapping -> Either RelationalError ()
332+validateTypeVarMap tvMap tConss = mapM_ (`validateAtomType` tConss) $ M.elems tvMap
223333
224334validateTuple :: RelationTuple -> TypeConstructorMapping -> Either RelationalError ()
225−validateTuple (RelationTuple _ atoms) tConss = mapM_ (\a -> validateAtomType (atomTypeForAtom a) tConss) atoms
335+validateTuple (RelationTuple _ atoms) tConss = mapM_ (`validateAtom` tConss) atoms
336+
337+--ensure that all types are fully resolved
338+validateAtom :: Atom -> TypeConstructorMapping -> Either RelationalError ()
339+validateAtom (RelationAtom (Relation _ tupSet)) tConss = mapM_ (`validateTuple` tConss) (asList tupSet)
340+validateAtom (ConstructedAtom _ dConsType atomArgs) tConss = do
341+ validateAtomType dConsType tConss
342+ mapM_ (`validateAtom` tConss) atomArgs
343+validateAtom _ _ = pure ()
344+
226345
227−-- | Determine if two types are equal or compatible (including special handling for AnyAtomType).
346+-- | Determine if two types are equal or compatible (including special handling for TypeVar x).
228347atomTypeVerify :: AtomType -> AtomType -> Either RelationalError AtomType
229−atomTypeVerify AnyAtomType x = Right x
230−atomTypeVerify x AnyAtomType = Right x
231−atomTypeVerify x@(ConstructedAtomType tConsNameA tVarMapA) (ConstructedAtomType tConsNameB tVarMapB) =
232− if tConsNameA /= tConsNameB then
233− Left (TypeConstructorNameMismatch tConsNameA tConsNameB)
234− else if not (typeVarMapsVerify tVarMapA tVarMapB) then
235− Left (TypeConstructorTypeVarsTypesMismatch tConsNameA tVarMapA tVarMapB)
236− else
237− Right x
348+atomTypeVerify (TypeVariableType _) x = Right x
349+atomTypeVerify x (TypeVariableType _) = Right x
350+atomTypeVerify x@(ConstructedAtomType tConsNameA tVarMapA) (ConstructedAtomType tConsNameB tVarMapB)
351+ | tConsNameA /= tConsNameB = Left (TypeConstructorNameMismatch tConsNameA tConsNameB)
352+ | not (typeVarMapsVerify tVarMapA tVarMapB) = Left (TypeConstructorTypeVarsTypesMismatch tConsNameA tVarMapA tVarMapB)
353+ | otherwise = Right x
354+
238355atomTypeVerify x@(RelationAtomType attrs1) y@(RelationAtomType attrs2) = do
239− _ <- mapM (\(attr1,attr2) -> let name1 = A.attributeName attr1
240− name2 = A.attributeName attr2 in
356+ mapM_ (\(attr1,attr2) -> let name1 = A.attributeName attr1
357+ name2 = A.attributeName attr2 in
241358 if notElem "_" [name1, name2] && name1 /= name2 then
242359 Left $ AtomTypeMismatchError x y
243360 else
244− atomTypeVerify (A.atomType attr1) (A.atomType attr2)) $ V.toList (V.zip attrs1 attrs2)
361+ atomTypeVerify (A.atomType attr1) (A.atomType attr2)) $ V.toList (V.zip (attributesVec attrs1) (attributesVec attrs2))
245362 return x
246363atomTypeVerify x y = if x == y then
247364 Right x
248365 else
249366 Left $ AtomTypeMismatchError x y
250367
251−-- | Determine if two typeVar
368+-- | Determine if two typeVars are logically compatible.
252369typeVarMapsVerify :: TypeVarMap -> TypeVarMap -> Bool
253−typeVarMapsVerify a b = M.keysSet a == M.keysSet b && (length . rights) (map (\((_,v1),(_,v2)) -> atomTypeVerify v1 v2) (zip (M.toAscList a) (M.toAscList b))) == M.size a
370+typeVarMapsVerify a b = M.keysSet a == M.keysSet b && (length . rights) zipped == M.size a
371+ where
372+ zipped = zipWith
373+ (curry (\ ((_, v1), (_, v2)) -> atomTypeVerify v1 v2))
374+ (M.toAscList a)
375+ (M.toAscList b)
254376
255377prettyAtomType :: AtomType -> T.Text
256−prettyAtomType (RelationAtomType attrs) = "relation {" `T.append` T.intercalate "," (map prettyAttribute (V.toList attrs)) `T.append` "}"
378+prettyAtomType (RelationAtomType attrs) = "relation {" `T.append` T.intercalate "," (map prettyAttribute (V.toList (attributesVec attrs))) `T.append` "}"
257379prettyAtomType (ConstructedAtomType tConsName typeVarMap) = tConsName `T.append` T.concat (map showTypeVars (M.toList typeVarMap))
258380 where
381+ showTypeVars (_, TypeVariableType x) = " " <> x
259382 showTypeVars (tyVarName, aType) = " (" `T.append` tyVarName `T.append` "::" `T.append` prettyAtomType aType `T.append` ")"
260383-- it would be nice to have the original ordering, but we don't have access to the type constructor here- maybe the typevarmap should be also positional (ordered map?)
261−prettyAtomType AnyAtomType = "?AnyAtomType?"
262−prettyAtomType aType = (T.pack . show) aType
384+prettyAtomType (TypeVariableType x) = x
385+prettyAtomType aType = T.take (T.length fullName - T.length "AtomType") fullName
386+ where fullName = (T.pack . show) aType
263387
264388prettyAttribute :: Attribute -> T.Text
389+prettyAttribute (Attribute _ (TypeVariableType x)) = x
265390prettyAttribute attr = A.attributeName attr `T.append` "::" `T.append` prettyAtomType (A.atomType attr)
266391
392+resolveTypeVariables :: [AtomType] -> [AtomType] -> Either RelationalError TypeVarMap
393+resolveTypeVariables expectedArgTypes actualArgTypes = do
394+ let tvmaps = zipWith resolveTypeVariable expectedArgTypes actualArgTypes
395+ --if there are any new keys which don't have equal values then we have a conflict!
396+ foldM (\acc tvmap -> do
397+ let inter = M.intersectionWithKey (\tvName vala valb ->
398+ if vala /= valb then
399+ Left (AtomFunctionTypeVariableMismatch tvName vala valb)
400+ else
401+ Right vala) acc tvmap
402+ errs = lefts (M.elems inter)
403+ case errs of
404+ [] -> pure (M.unions tvmaps)
405+ errs' -> Left (someErrors errs')) M.empty tvmaps
406+
407+resolveTypeVariable :: AtomType -> AtomType -> TypeVarMap
408+resolveTypeVariable (TypeVariableType tv) typ = M.singleton tv typ
409+resolveTypeVariable (ConstructedAtomType _ _) (ConstructedAtomType _ actualTvMap) = actualTvMap
410+resolveTypeVariable _ _ = M.empty
411+
412+resolveFunctionReturnValue :: AtomFunctionName -> TypeVarMap -> AtomType -> Either RelationalError AtomType
413+resolveFunctionReturnValue funcName tvMap (ConstructedAtomType tCons retMap) = do
414+ let diff = M.difference retMap tvMap
415+ if M.null diff then
416+ pure (ConstructedAtomType tCons (M.intersection tvMap retMap))
417+ else
418+ Left (AtomFunctionTypeVariableResolutionError funcName (fst (head (M.toList diff))))
419+resolveFunctionReturnValue funcName tvMap (TypeVariableType tvName) = case M.lookup tvName tvMap of
420+ Nothing -> Left (AtomFunctionTypeVariableResolutionError funcName tvName)
421+ Just typ -> pure typ
422+resolveFunctionReturnValue _ _ typ = pure typ
423+
424+-- convert a typevarmap and data constructor definition into a list of atomtypes which represent the arguments-- no type variables are allowed to remain
425+resolvedAtomTypesForDataConstructorDefArgs :: TypeConstructorMapping -> TypeVarMap -> DataConstructorDef -> Either RelationalError [AtomType]
426+resolvedAtomTypesForDataConstructorDefArgs tConsMap tvMap (DataConstructorDef _ args) = mapM (resolvedAtomTypeForDataConstructorDefArg tConsMap tvMap) args
427+
428+resolvedAtomTypeForDataConstructorDefArg :: TypeConstructorMapping -> TypeVarMap -> DataConstructorDefArg -> Either RelationalError AtomType
429+resolvedAtomTypeForDataConstructorDefArg tConsMap tvMap (DataConstructorDefTypeConstructorArg typCons) = atomTypeForTypeConstructor typCons tConsMap tvMap
430+resolvedAtomTypeForDataConstructorDefArg _ tvMap (DataConstructorDefTypeVarNameArg tvName) = case M.lookup tvName tvMap of
431+ Nothing -> Left (DataConstructorUsesUndeclaredTypeVariable tvName)
432+ Just typ -> Right typ
433+
434+isResolvedType :: AtomType -> Bool
435+isResolvedType typ =
436+ case typ of
437+ IntAtomType -> True
438+ IntegerAtomType -> True
439+ DoubleAtomType -> True
440+ TextAtomType -> True
441+ DayAtomType -> True
442+ DateTimeAtomType -> True
443+ ByteStringAtomType -> True
444+ BoolAtomType -> True
445+ RelationalExprAtomType -> True
446+ RelationAtomType attrs -> isResolvedAttributes attrs
447+ ConstructedAtomType _ tvMap -> all isResolvedType (M.elems tvMap)
448+ TypeVariableType _ -> False
449+
450+isResolvedAttributes :: Attributes -> Bool
451+isResolvedAttributes attrs = all isResolvedAttribute (V.toList (attributesVec attrs))
452+
453+isResolvedAttribute :: Attribute -> Bool
454+isResolvedAttribute = isResolvedType . A.atomType
455+
456+--given two AtomTypes x,y
src/lib/ProjectM36/Atomable.hsnew file+286
@@ -0,0 +1,286 @@
1+{-# LANGUAGE DefaultSignatures, TypeFamilies, TypeOperators, PolyKinds, FlexibleInstances, ScopedTypeVariables, FlexibleContexts #-}
2+{-# OPTIONS_GHC -fno-warn-orphans #-}
3+module ProjectM36.Atomable where
4+--http://stackoverflow.com/questions/13448361/type-families-with-ghc-generics-or-data-data
5+--instances to marshal Haskell ADTs to ConstructedAtoms and back
6+import ProjectM36.Base
7+import ProjectM36.DataTypes.List
8+import ProjectM36.DataTypes.NonEmptyList
9+import ProjectM36.DataTypes.Maybe
10+import ProjectM36.DataTypes.Either
11+import GHC.Generics
12+import qualified Data.Map as M
13+import qualified Data.Text as T
14+import qualified Data.Vector as V
15+import Control.DeepSeq (NFData)
16+import Control.Applicative
17+import Data.Time.Calendar
18+import Data.ByteString (ByteString)
19+import Data.Time.Clock
20+import Data.Proxy
21+import qualified Data.List.NonEmpty as NE
22+import Codec.Winery
23+
24+-- | All database values ("atoms") adhere to the 'Atomable' typeclass. This class is derivable allowing new datatypes to be easily marshaling between Haskell values and database values.
25+class (Eq a, NFData a, Serialise a, Show a) => Atomable a where
26+ toAtom :: a -> Atom
27+ default toAtom :: (Generic a, AtomableG (Rep a)) => a -> Atom
28+ toAtom v = toAtomG (from v) (toAtomTypeG (from v))
29+
30+ fromAtom :: Atom -> a
31+ default fromAtom :: (Generic a, AtomableG (Rep a)) => Atom -> a
32+ fromAtom v@(ConstructedAtom _ _ args) = case fromAtomG v args of
33+ Nothing -> error "no fromAtomG traversal found"
34+ Just x -> to x
35+ fromAtom v = case fromAtomG v [] of
36+ Nothing -> error "no fromAtomG for Atom found"
37+ Just x -> to x
38+
39+ toAtomType :: proxy a -> AtomType
40+ default toAtomType :: (Generic a, AtomableG (Rep a)) => proxy a -> AtomType
41+ toAtomType _ = toAtomTypeG (from (undefined :: a))
42+
43+ -- | Creates DatabaseContextExpr necessary to load the type constructor and data constructor into the database.
44+ toAddTypeExpr :: proxy a -> DatabaseContextExpr
45+ default toAddTypeExpr :: (Generic a, AtomableG (Rep a)) => proxy a -> DatabaseContextExpr
46+ toAddTypeExpr _ = toAddTypeExprG (from (error "insufficient laziness" :: a)) (toAtomType (Proxy :: Proxy a))
47+
48+instance Atomable Integer where
49+ toAtom = IntegerAtom
50+ fromAtom (IntegerAtom i) = i
51+ fromAtom e = error ("improper fromAtom" ++ show e)
52+ toAtomType _ = IntegerAtomType
53+ toAddTypeExpr _ = NoOperation
54+
55+instance Atomable Int where
56+ toAtom = IntAtom
57+ fromAtom (IntAtom i) = i
58+ fromAtom e = error ("improper fromAtom" ++ show e)
59+ toAtomType _ = IntAtomType
60+ toAddTypeExpr _ = NoOperation
61+
62+instance Atomable Double where
63+ toAtom = DoubleAtom
64+ fromAtom (DoubleAtom d) = d
65+ fromAtom _ = error "improper fromAtom"
66+ toAtomType _ = DoubleAtomType
67+ toAddTypeExpr _ = NoOperation
68+
69+instance Atomable T.Text where
70+ toAtom = TextAtom
71+ fromAtom (TextAtom t) = t
72+ fromAtom _ = error "improper fromAtom"
73+ toAtomType _ = TextAtomType
74+ toAddTypeExpr _ = NoOperation
75+
76+instance Atomable Day where
77+ toAtom = DayAtom
78+ fromAtom (DayAtom d) = d
79+ fromAtom _ = error "improper fromAtom"
80+ toAtomType _ = DayAtomType
81+ toAddTypeExpr _ = NoOperation
82+
83+instance Atomable UTCTime where
84+ toAtom = DateTimeAtom
85+ fromAtom (DateTimeAtom t) = t
86+ fromAtom _ = error "improper fromAtom"
87+ toAtomType _ = DateTimeAtomType
88+ toAddTypeExpr _ = NoOperation
89+
90+instance Atomable ByteString where
91+ toAtom = ByteStringAtom
92+ fromAtom (ByteStringAtom b) = b
93+ fromAtom _ = error "improper fromAtom"
94+ toAtomType _ = ByteStringAtomType
95+ toAddTypeExpr _ = NoOperation
96+
97+instance Atomable Bool where
98+ toAtom = BoolAtom
99+ fromAtom (BoolAtom b) = b
100+ fromAtom _ = error "improper fromAtom"
101+ toAtomType _ = BoolAtomType
102+ toAddTypeExpr _ = NoOperation
103+
104+{-
105+instance Atomable Relation where
106+ toAtom = RelationAtom
107+ fromAtom (RelationAtom r) = r
108+ fromAtom _ = error "improper fromAtom"
109+ --warning: cannot be used with undefined "Relation"
110+ toAtomType rel = RelationAtomType (attributes rel)
111+ toAddTypeExpr _ = NoOperation
112+-}
113+
114+instance Atomable a => Atomable (Maybe a) where
115+ toAtom (Just v) = ConstructedAtom "Just" (maybeAtomType (toAtomType (Proxy :: Proxy a))) [toAtom v]
116+ toAtom Nothing = ConstructedAtom "Nothing" (maybeAtomType (toAtomType (Proxy :: Proxy a))) []
117+
118+ fromAtom (ConstructedAtom "Just" _ [val]) = Just (fromAtom val)
119+ fromAtom (ConstructedAtom "Nothing" _ []) = Nothing
120+ fromAtom _ = error "improper fromAtom (Maybe a)"
121+
122+ toAtomType _ = ConstructedAtomType "Maybe" (M.singleton "a" (toAtomType (Proxy :: Proxy a)))
123+ toAddTypeExpr _ = NoOperation
124+
125+instance (Atomable a, Atomable b) => Atomable (Either a b) where
126+ toAtom (Left l) = ConstructedAtom "Left" (eitherAtomType (toAtomType (Proxy :: Proxy a))
127+ (toAtomType (Proxy :: Proxy b))) [toAtom l]
128+ toAtom (Right r) = ConstructedAtom "Right" (eitherAtomType (toAtomType (Proxy :: Proxy a))
129+ (toAtomType (Proxy :: Proxy b))) [toAtom r]
130+
131+ fromAtom (ConstructedAtom "Left" _ [val]) = Left (fromAtom val)
132+ fromAtom (ConstructedAtom "Right" _ [val]) = Right (fromAtom val)
133+ fromAtom _ = error "improper fromAtom (Either a b)"
134+
135+--convert to ADT list
136+instance Atomable a => Atomable [a] where
137+ toAtom [] = ConstructedAtom "Empty" (listAtomType (toAtomType (Proxy :: Proxy a))) []
138+ toAtom (x:xs) = ConstructedAtom "Cons" (listAtomType (toAtomType (Proxy :: Proxy a))) (toAtom x: [toAtom xs])
139+
140+ fromAtom (ConstructedAtom "Empty" _ _) = []
141+ fromAtom (ConstructedAtom "Cons" _ [x,y]) = fromAtom x:fromAtom y
142+ fromAtom _ = error "improper fromAtom [a]"
143+
144+ toAtomType _ = ConstructedAtomType "List" (M.singleton "a" (toAtomType (Proxy :: Proxy a)))
145+ toAddTypeExpr _ = NoOperation
146+
147+instance Atomable a => Atomable (NE.NonEmpty a) where
148+ toAtom (x NE.:| []) = ConstructedAtom "NECons" (nonEmptyListAtomType (toAtomType (Proxy :: Proxy a))) [toAtom x]
149+ toAtom (x NE.:| xs) = ConstructedAtom "NECons" (nonEmptyListAtomType (toAtomType (Proxy :: Proxy a))) (map toAtom (x:xs))
150+ fromAtom _ = error "improper fromAtom (NonEmptyList a)"
151+
152+ toAtomType _ = ConstructedAtomType "NonEmptyList" (M.singleton "a" (toAtomType (Proxy :: Proxy a)))
153+ toAddTypeExpr _ = NoOperation
154+
155+-- Generics
156+class AtomableG g where
157+ --type AtomTG g
158+ toAtomG :: g a -> AtomType -> Atom
159+ fromAtomG :: Atom -> [Atom] -> Maybe (g a)
160+ toAtomTypeG :: g a -> AtomType --overall ConstructedAtomType
161+ toAtomsG :: g a -> [Atom]
162+ toAddTypeExprG :: g a -> AtomType -> DatabaseContextExpr
163+ getConstructorsG :: g a -> [DataConstructorDef]
164+ getConstructorArgsG :: g a -> [DataConstructorDefArg]
165+
166+--data type metadata
167+instance (Datatype c, AtomableG a) => AtomableG (M1 D c a) where
168+ toAtomG (M1 v) = toAtomG v
169+ fromAtomG atom args = M1 <$> fromAtomG atom args
170+ toAtomsG = error "invalid toAtomsG in M1 D"
171+ toAtomTypeG _ = ConstructedAtomType (T.pack typeName) M.empty -- generics don't allow us to get the type constructor variables- alternatives?
172+ where
173+ typeName = datatypeName (undefined :: M1 D c a x)
174+ toAddTypeExprG ~(M1 v) (ConstructedAtomType tcName _) = AddTypeConstructor tcDef dataConstructors
175+ where
176+ tcDef = ADTypeConstructorDef tcName []
177+ dataConstructors = getConstructorsG v
178+ toAddTypeExprG _ _ = NoOperation
179+ getConstructorsG ~(M1 v) = getConstructorsG v
180+ getConstructorArgsG = error "invalid getConstructorArgsG in M1 D"
181+
182+--constructor metadata
183+instance (Constructor c, AtomableG a) => AtomableG (M1 C c a) where
184+ --constructor name needed for Atom but not for atomType
185+ toAtomG (M1 v) t = ConstructedAtom (T.pack constructorName) t atoms
186+ where
187+ atoms = toAtomsG v
188+ constructorName = conName (undefined :: M1 C c a x)
189+ fromAtomG atom@(ConstructedAtom dConsName _ _) args = if dName == dConsName then
190+ M1 <$> fromAtomG atom args
191+ else
192+ Nothing
193+ where
194+ dName = T.pack (conName (undefined :: M1 C c a x))
195+ fromAtomG _ _ = error "invalid fromAtomG in M1 C"
196+ toAtomsG = error "invalid toAtomsG in M1 C"
197+ toAtomTypeG = error "invalid toAtomTypeG in M1 C"
198+ toAddTypeExprG = error "invalid toAddTypeExprG in M1 C"
199+ getConstructorsG ~(M1 v) = [DataConstructorDef (T.pack dName) dArgs]
200+ where
201+ dName = conName (undefined :: M1 C c a x)
202+ dArgs = getConstructorArgsG v
203+ getConstructorArgsG = undefined
204+
205+--field metadata
206+instance (Selector c, AtomableG a) => AtomableG (M1 S c a) where
207+ toAtomG = undefined
208+ fromAtomG atom args = M1 <$> fromAtomG atom args
209+ toAtomsG (M1 v) = toAtomsG v
210+ toAtomTypeG (M1 v) = toAtomTypeG v
211+ toAddTypeExprG = error "invalid toAddTypeExprG in M1 S"
212+ getConstructorsG = error "invalid getConstructorsG in M1 S"
213+ getConstructorArgsG ~(M1 v) = getConstructorArgsG v
214+
215+-- field data metadata
216+instance (Atomable a) => AtomableG (K1 c a) where
217+ toAtomG (K1 v) _ = toAtom v
218+ fromAtomG _ args = K1 <$> Just (fromAtom (headatom args))
219+ where headatom (x:_) = x
220+ headatom [] = error "no more atoms for constructor!"
221+ toAtomsG (K1 v) = [toAtom v]
222+ toAtomTypeG _ = toAtomType (Proxy :: Proxy a)
223+ toAddTypeExprG = error "invalid toAddTypeExprG in K1"
224+ getConstructorsG = error "invalid getConstructorsG in K1"
225+ getConstructorArgsG ~(K1 _) = [DataConstructorDefTypeConstructorArg tCons]
226+ where
227+ tCons = typeToTypeConstructor $ toAtomType (Proxy :: Proxy a)
228+
229+typeToTypeConstructor :: AtomType -> TypeConstructor
230+typeToTypeConstructor x@IntAtomType = PrimitiveTypeConstructor "Int" x
231+typeToTypeConstructor x@IntegerAtomType = PrimitiveTypeConstructor "Integer" x
232+typeToTypeConstructor x@DoubleAtomType = PrimitiveTypeConstructor "Double" x
233+typeToTypeConstructor x@TextAtomType = PrimitiveTypeConstructor "Text" x
234+typeToTypeConstructor x@DayAtomType = PrimitiveTypeConstructor "Day" x
235+typeToTypeConstructor x@DateTimeAtomType = PrimitiveTypeConstructor "DateTime" x
236+typeToTypeConstructor x@ByteStringAtomType = PrimitiveTypeConstructor "ByteString" x
237+typeToTypeConstructor x@BoolAtomType = PrimitiveTypeConstructor "Bool" x
238+typeToTypeConstructor x@RelationalExprAtomType = PrimitiveTypeConstructor "RelationalExpr" x
239+typeToTypeConstructor (RelationAtomType attrs)
240+ = RelationAtomTypeConstructor $ map attrToAttrExpr $ V.toList (attributesVec attrs)
241+ where
242+ attrToAttrExpr (Attribute n t) = AttributeAndTypeNameExpr n (typeToTypeConstructor t) ()
243+typeToTypeConstructor (ConstructedAtomType tcName tvMap)
244+ = ADTypeConstructor tcName $ map typeToTypeConstructor (M.elems tvMap)
245+typeToTypeConstructor (TypeVariableType tvName) = TypeVariable tvName
246+
247+instance AtomableG U1 where
248+ toAtomG = error "invalid toAtomG in U1"
249+ fromAtomG _ _ = pure U1
250+ toAtomsG _ = []
251+ toAtomTypeG = error "invalid toAtomTypeG in U1"
252+ toAddTypeExprG = error "invalid toAddTypeExprG in U1"
253+ getConstructorsG = error "invalid getConstructorsG in U1"
254+ getConstructorArgsG _ = []
255+
256+-- product types
257+instance (AtomableG a, AtomableG b) => AtomableG (a :*: b) where
258+ toAtomG = undefined
259+ fromAtomG atom args = (:*:) <$> fromAtomG atom splitargs1 <*> fromAtomG atom splitargs2
260+ where splitargs1 = take splitpoint args
261+ splitargs2 = drop splitpoint args
262+ splitpoint = length args `div` 2
263+ toAtomTypeG = error "invalid toAtomTypeG in :*:"
264+ toAtomsG (x :*: y) = toAtomsG x ++ toAtomsG y
265+ toAddTypeExprG = error "invalid toAddTypeExprG in :*:"
266+ getConstructorsG = error "invalid getConstructorsG in :*:"
267+ getConstructorArgsG ~(x :*: y) = getConstructorArgsG x ++ getConstructorArgsG y
268+
269+-- sum types
270+instance (AtomableG a, AtomableG b) => AtomableG (a :+: b) where
271+ toAtomG (L1 x) = toAtomG x
272+ toAtomG (R1 x) = toAtomG x
273+ fromAtomG atom args = (L1 <$> fromAtomG atom args) <|> (R1 <$> fromAtomG atom args)
274+ toAtomTypeG = error "invalid toAtomTypeG in :+:"
275+ toAtomsG (L1 x) = toAtomsG x
276+ toAtomsG (R1 x) = toAtomsG x
277+ toAddTypeExprG = error "invalid toAddTypeExprG in :+:"
278+ getConstructorsG _ = getConstructorsG (undefined :: a x) ++ getConstructorsG (undefined :: b x)
279+ getConstructorArgsG = error "invalid getConstructorArgsG in :+:"
280+
281+--this represents the unimplemented generics traversals which should never be called
282+{-
283+missingError :: a
284+missingError = error "missing generics traversal"
285+-}
286+
src/lib/ProjectM36/Attribute.hs+188−33
@@ -1,3 +1,4 @@
1+{-# OPTIONS_GHC -fno-warn-orphans #-}
12module ProjectM36.Attribute where
23import ProjectM36.Base
34import ProjectM36.Error
@@ -6,18 +7,58 @@ import qualified Data.List as L
67import qualified Data.Vector as V
78import qualified Data.Hashable as Hash
89import qualified Data.HashSet as HS
10+import qualified Data.Map as M
11+import Data.Either
912
1013arity :: Attributes -> Int
11−arity = V.length
14+arity a = V.length (attributesVec a)
15+
16+instance Semigroup Attributes where
17+ attrsA <> attrsB =
18+ case joinAttributes attrsA attrsB of
19+ Left err -> error (show err)
20+ Right attrs' -> attrs'
21+
22+instance Monoid Attributes where
23+ mempty = Attributes {
24+ attributesVec = mempty
25+ --,attributeSet = mempty
26+ }
1227
1328emptyAttributes :: Attributes
14−emptyAttributes = V.empty
29+emptyAttributes = mempty
1530
1631null :: Attributes -> Bool
17−null = V.null
32+null a = V.null (attributesVec a)
33+
34+singleton :: Attribute -> Attributes
35+singleton attr = Attributes {
36+ attributesVec = V.singleton attr
37+ --,attributesSet = HS.singleton attr
38+ }
39+
40+toList :: Attributes -> [Attribute]
41+toList attrs = V.toList (attributesVec attrs)
1842
1943attributesFromList :: [Attribute] -> Attributes
20−attributesFromList = V.fromList -- . L.nub --too expensive
44+attributesFromList attrsL = Attributes {
45+ attributesVec = vec
46+ --,attributesSet = hset
47+ }
48+ where
49+ vec = if length attrsL == HS.size hset then
50+ --fast path- no duplicates
51+ V.fromList attrsL
52+ else
53+ --duplicate detected, uniqueify while maintaining original ordering
54+ V.fromList uniquedL
55+ hset = HS.fromList attrsL
56+ uniquedL = fst $ foldr (\attr acc@(l,s) ->
57+ if HS.member attr s then
58+ acc
59+ else
60+ (l ++ [attr], HS.insert attr s))
61+ ([],mempty) attrsL
2162
2263attributeName :: Attribute -> AttributeName
2364attributeName (Attribute name _) = name
@@ -26,34 +67,70 @@ atomType :: Attribute -> AtomType
2667atomType (Attribute _ atype) = atype
2768
2869atomTypes :: Attributes -> V.Vector AtomType
29−atomTypes attrs = V.map atomType attrs
70+atomTypes attrs = V.map atomType (attributesVec attrs)
71+
72+atomTypesList :: Attributes -> [AtomType]
73+atomTypesList = V.toList . atomTypes
3074
31−--hm- no error-checking here
3275addAttribute :: Attribute -> Attributes -> Attributes
33−addAttribute attr attrs = attrs `V.snoc` attr
76+addAttribute attr attrs = attrs <> singleton attr
3477
3578--if some attribute names overlap but the types do not, then spit back an error
79+{-joinAttributes :: Attributes -> Attributes -> Either RelationalError Attributes
80+joinAttributes attrs1 attrs2 | V.length uniqueOverlappingAttributes /= V.length overlappingAttributes = Left (TupleAttributeTypeMismatchError overlappingAttributes)
81+ | V.length overlappingAttrsDifferentTypes > 0 = Left (TupleAttributeTypeMismatchError overlappingAttrsDifferentTypes)
82+ | otherwise = Right $ vectorUniqueify (attrs1 V.++ attrs2)
83+ where
84+ overlappingAttrsDifferentTypes = V.filter (\attr -> V.elem (attributeName attr) attrNames2 && V.notElem attr attrs2) attrs1
85+ attrNames2 = V.map attributeName attrs2
86+ uniqueOverlappingAttributes = vectorUniqueify overlappingAttributes
87+ overlappingAttributes = V.filter (`V.elem` attrs2) attrs1
88+-}
3689joinAttributes :: Attributes -> Attributes -> Either RelationalError Attributes
37−joinAttributes attrs1 attrs2 = if V.length (vectorUniqueify overlappingAttributes) /= V.length overlappingAttributes then
38− Left $ TupleAttributeTypeMismatchError overlappingAttributes
39− else
40− Right $ vectorUniqueify (attrs1 V.++ attrs2)
90+joinAttributes attrs1 attrs2
91+ | S.size overlappingNames == 0 = -- fast path, no overlapping names
92+ pure (concated id)
93+ | attributesForNames overlappingNames attrs1 == attributesForNames overlappingNames attrs2 = -- that atomtypes match
94+ pure (concated vectorUniqueify)
95+ | otherwise =
96+ --special handling to validate that overlapping names have the same atom types
97+ Left (TupleAttributeTypeMismatchError (attributesForNames overlappingNames attrs1))
4198 where
42− overlappingAttributes = V.filter (\attr -> V.elem attr attrs2) attrs1
99+ nameSet1 = attributeNameSet attrs1
100+ nameSet2 = attributeNameSet attrs2
101+ overlappingNames = S.intersection nameSet1 nameSet2
102+ concated f = Attributes {
103+ attributesVec = f (attributesVec attrs1 <> attributesVec attrs2)
104+ --,attributesSet = attributesSet attrs1 <> attributesSet attrs2
105+ }
43106
44107addAttributes :: Attributes -> Attributes -> Attributes
45−addAttributes = (V.++)
108+addAttributes = (<>)
109+
110+member :: Attribute -> Attributes -> Bool
111+member attr attrs = HS.member attr (attributesSet attrs)
46112
47113deleteAttributeName :: AttributeName -> Attributes -> Attributes
48−deleteAttributeName attrName = V.filter (\attr -> attributeName attr /= attrName)
114+deleteAttributeName attrName = deleteAttributeNames (S.singleton attrName)
115+
116+deleteAttributeNames :: S.Set AttributeName -> Attributes -> Attributes
117+deleteAttributeNames attrNames attrs = Attributes {
118+ attributesVec = vec
119+ }
120+ where
121+ vec = V.filter attrFilter (attributesVec attrs)
122+ attrFilter attr = S.notMember (attributeName attr) attrNames
49123
50124renameAttribute :: AttributeName -> Attribute -> Attribute
51125renameAttribute newAttrName (Attribute _ typeo) = Attribute newAttrName typeo
52126
53127renameAttributes :: AttributeName -> AttributeName -> Attributes -> Attributes
54−renameAttributes oldAttrName newAttrName attrs = V.map renamer attrs
128+renameAttributes oldAttrName newAttrName attrs = Attributes {
129+ attributesVec = vec
130+ }
55131 where
56− renamer attr = if attributeName attr == oldAttrName then
132+ vec = V.map renamer (attributesVec attrs)
133+ renamer attr = if attributeName attr == oldAttrName then
57134 renameAttribute newAttrName attr
58135 else
59136 attr
@@ -64,27 +141,43 @@ atomTypeForAttributeName attrName attrs = do
64141 return atype
65142
66143attributeForName :: AttributeName -> Attributes -> Either RelationalError Attribute
67−attributeForName attrName attrs = case V.find ((attrName ==) . attributeName) attrs of
68− Nothing -> Left $ NoSuchAttributeNamesError (S.singleton attrName)
144+attributeForName attrName attrs = case V.find (\attr -> attributeName attr == attrName) (attributesVec attrs) of
145+ Nothing -> Left (NoSuchAttributeNamesError (S.singleton attrName))
69146 Just attr -> Right attr
70147
148+isAttributeNameContained :: AttributeName -> Attributes -> Bool
149+isAttributeNameContained nam attrs = isRight (attributeForName nam attrs)
150+
151+--similar to attributesForNames, but returns error if some names are missing
152+projectionAttributesForNames :: S.Set AttributeName -> Attributes -> Either RelationalError Attributes
153+projectionAttributesForNames names attrsIn =
154+ if not (S.null missingNames) then
155+ Left (NoSuchAttributeNamesError missingNames)
156+ else
157+ Right (attributesForNames names attrsIn)
158+ where
159+ missingNames = attributeNamesNotContained names (S.fromList (V.toList (attributeNames attrsIn)))
160+
71161attributesForNames :: S.Set AttributeName -> Attributes -> Attributes
72−attributesForNames attrNameSet attrs = V.filter filt attrs
162+attributesForNames attrNameSet attrs = Attributes {
163+ attributesVec = vec
164+ }
73165 where
166+ vec = V.filter filt (attributesVec attrs)
74167 filt attr = S.member (attributeName attr) attrNameSet
75168
76169attributeNameSet :: Attributes -> S.Set AttributeName
77−attributeNameSet attrVec = S.fromList $ V.toList $ V.map (\(Attribute name _) -> name) attrVec
170+attributeNameSet attrs = S.fromList $ V.toList $ V.map (\(Attribute name _) -> name) (attributesVec attrs)
78171
79172attributeNames :: Attributes -> V.Vector AttributeName
80−attributeNames = V.map attributeName
173+attributeNames attrs = V.map attributeName (attributesVec attrs)
81174
82175--checks if set s1 is wholly contained in the set s2
83176attributesContained :: Attributes -> Attributes -> Bool
84177attributesContained attrs1 attrs2 = attributeNamesContained (attributeNameSet attrs1) (attributeNameSet attrs2)
85178
86179attributeNamesContained :: S.Set AttributeName -> S.Set AttributeName -> Bool
87−attributeNamesContained attrs1 attrs2 = S.isSubsetOf attrs1 attrs2
180+attributeNamesContained = S.isSubsetOf
88181
89182--returns the disjunction of the AttributeNameSets
90183nonMatchingAttributeNameSet :: S.Set AttributeName -> S.Set AttributeName -> S.Set AttributeName
@@ -94,30 +187,92 @@ matchingAttributeNameSet :: S.Set AttributeName -> S.Set AttributeName -> S.Set
94187matchingAttributeNameSet = S.intersection
95188
96189attributeNamesNotContained :: S.Set AttributeName -> S.Set AttributeName -> S.Set AttributeName
97−attributeNamesNotContained subset superset = S.filter (flip S.notMember superset) subset
190+attributeNamesNotContained subset superset = S.filter (`S.notMember` superset) subset
191+
192+-- useful for display
193+orderedAttributes :: Attributes -> [Attribute]
194+orderedAttributes attrs = L.sortBy (\a b -> attributeName a `compare` attributeName b) (V.toList (attributesVec attrs))
98195
99−-- this is sorted so the tuples know in which order to output- the ordering is arbitrary
100−sortedAttributeNameList :: S.Set AttributeName -> [AttributeName]
101−sortedAttributeNameList attrNameSet= L.sort $ S.toList attrNameSet
196+orderedAttributeNames :: Attributes -> [AttributeName]
197+orderedAttributeNames attrs = map attributeName (orderedAttributes attrs)
102198
103199-- take two attribute sets and return an attribute set with the attributes which do not match
200+--this is the function which benefits the most from the HashSet representation- this turned up in the insert performance test
104201attributesDifference :: Attributes -> Attributes -> Attributes
105−attributesDifference attrsA attrsB = V.fromList $ diff (V.toList attrsA) (V.toList attrsB)
202+{-attributesDifference attrsA attrsB = V.fromList $ diff (V.toList attrsA) (V.toList attrsB)
106203 where
107204 diff a b = (a L.\\ b) ++ (b L.\\ a)
205+-}
206+attributesDifference attrsA attrsB =
207+ if attributesSet attrsA == attributesSet attrsB then
208+ mempty
209+ else
210+ Attributes {
211+ attributesVec = vec
212+ --,attributesSet = hset
213+ }
214+ where
215+ hset = HS.difference setA setB <> HS.difference setB setA
216+ setA = attributesSet attrsA
217+ setB = attributesSet attrsB
218+ vec = V.filter (`HS.member` hset) (attributesVec attrsA <> attributesVec attrsB)
108219
109220vectorUniqueify :: (Hash.Hashable a, Eq a) => V.Vector a -> V.Vector a
110221vectorUniqueify vecIn = V.fromList $ HS.toList $ HS.fromList $ V.toList vecIn
111222
112223--check that each attribute only appears once
113224verifyAttributes :: Attributes -> Either RelationalError Attributes
114−verifyAttributes attrs = if collapsedAttrs /= attrs then
115− Left $ TupleAttributeTypeMismatchError (attributesDifference collapsedAttrs attrs)
116− else
117− Right attrs
225+verifyAttributes attrs =
226+ if vecSet == attributesSet attrs then
227+ pure attrs
228+ else
229+ Left (TupleAttributeTypeMismatchError diffAttrs)
230+ where
231+ vecSet = V.foldr' HS.insert HS.empty (attributesVec attrs)
232+ diffSet = HS.difference vecSet (attributesSet attrs) <> HS.difference (attributesSet attrs) vecSet
233+ diffAttrs = Attributes {
234+ attributesVec = V.fromList (HS.toList diffSet)
235+ --,attributesSet = diffSet
236+ }
237+
238+--used in Generics derivation for ADTs without named attributes- not to be used elsewhere
239+--drop first n attributes from vector representation
240+drop :: Int -> Attributes -> Attributes
241+drop c attrs = Attributes { attributesVec = vec
242+ }
118243 where
119− collapsedAttrs = vectorUniqueify attrs
244+ vec = V.drop c (attributesVec attrs)
120245
246+
247+-- use this in preference to attributesEqual when the attribute ordering matters such as during tuple unions
248+attributesAndOrderEqual :: Attributes -> Attributes -> Bool
249+attributesAndOrderEqual a b = attributesVec a == attributesVec b
250+
251+-- use to determine if the same attributes are contained (but ordering is irrelevant)
121252attributesEqual :: Attributes -> Attributes -> Bool
122−attributesEqual attrs1 attrs2 = V.null (attributesDifference attrs1 attrs2)
253+attributesEqual attrsA attrsB =
254+ attributesVec attrsA == attributesVec attrsB ||
255+ attributesSet attrsA == attributesSet attrsB
256+
257+attributesAsMap :: Attributes -> M.Map AttributeName Attribute
258+attributesAsMap attrs = V.foldr' (\attr acc -> M.insert (attributeName attr) attr acc) mempty (attributesVec attrs)
259+
123260
261+-- | Left-biased union of attributes.
262+union :: Attributes -> Attributes -> Attributes
263+union attrsA attrsB = Attributes {
264+ attributesVec = vec
265+ --,attributesSet = hset
266+ }
267+ where
268+ hset = HS.union (attributesSet attrsA) (attributesSet attrsB)
269+ vec = HS.foldr (flip V.snoc) mempty hset
270+
271+intersection :: Attributes -> Attributes -> Attributes
272+intersection attrsA attrsB = Attributes {
273+ attributesVec = vec
274+ --,attributesSet = hset
275+ }
276+ where
277+ hset = HS.intersection (attributesSet attrsA) (attributesSet attrsB)
278+ vec = HS.foldr (flip V.snoc) mempty hset
src/lib/ProjectM36/AttributeExpr.hsnew file+7
@@ -0,0 +1,7 @@
1+module ProjectM36.AttributeExpr where
2+import ProjectM36.Base
3+import ProjectM36.Attribute as A
4+
5+attributeName :: AttributeExprBase a -> AttributeName
6+attributeName (AttributeAndTypeNameExpr nam _ _) = nam
7+attributeName (NakedAttributeExpr attr) = A.attributeName attr
src/lib/ProjectM36/AttributeNames.hs+5−24
@@ -1,30 +1,11 @@
11module ProjectM36.AttributeNames where
2−import qualified ProjectM36.Attribute as A
32import ProjectM36.Base
4−import ProjectM36.Error
53import qualified Data.Set as S
6−--AttributeNames is a data structure which can represent inverted projection attributes
4+--AttributeNames is a data structure which can represent inverted projection attributes and attribute names derived from relational expressions
75
8−--check that the attribute names are actually in the attributes
9−projectionAttributesForAttributeNames :: Attributes -> AttributeNames -> Either RelationalError Attributes
10−projectionAttributesForAttributeNames attrs (AttributeNames attrNameSet) = do
11− let nonExistentAttributeNames = A.attributeNamesNotContained attrNameSet (A.attributeNameSet attrs)
12− if not $ S.null nonExistentAttributeNames then
13− Left $ AttributeNamesMismatchError nonExistentAttributeNames
14− else
15− return $ A.attributesForNames attrNameSet attrs
16−
17−projectionAttributesForAttributeNames attrs (InvertedAttributeNames unselectedAttrNameSet) = do
18− let nonExistentAttributeNames = A.attributeNamesNotContained unselectedAttrNameSet (A.attributeNameSet attrs)
19− if not $ S.null nonExistentAttributeNames then
20− Left $ AttributeNamesMismatchError nonExistentAttributeNames
21− else
22− return $ A.attributesForNames (A.nonMatchingAttributeNameSet unselectedAttrNameSet (A.attributeNameSet attrs)) attrs
6+empty :: AttributeNamesBase a
7+empty = AttributeNames S.empty
238
24−attributeNameSet :: AttributeNames -> S.Set AttributeName
25−attributeNameSet (AttributeNames nameSet) = nameSet
26−attributeNameSet (InvertedAttributeNames nameSet) = nameSet
9+all :: AttributeNamesBase a
10+all = InvertedAttributeNames S.empty
2711
28−invertAttributeNames :: AttributeNames -> AttributeNames
29−invertAttributeNames (AttributeNames names) = InvertedAttributeNames names
30−invertAttributeNames (InvertedAttributeNames names) = AttributeNames names
src/lib/ProjectM36/Base.hs+362−184
@@ -1,32 +1,39 @@
1−{-# LANGUAGE ExistentialQuantification,BangPatterns,DeriveGeneric,DeriveAnyClass, TypeSynonymInstances, FlexibleInstances #-}
1+{-# LANGUAGE ExistentialQuantification,DeriveGeneric,DeriveAnyClass,FlexibleInstances,OverloadedStrings, DeriveTraversable, DerivingVia, TemplateHaskell, TypeFamilies #-}
22{-# OPTIONS_GHC -fno-warn-orphans #-}
3+
34module ProjectM36.Base where
5+import ProjectM36.DatabaseContextFunctionError
6+import ProjectM36.AtomFunctionError
7+import ProjectM36.MerkleHash
8+
9+import Data.Functor.Foldable.TH
410import qualified Data.Map as M
511import qualified Data.HashSet as HS
612import Data.Hashable (Hashable, hashWithSalt)
713import qualified Data.Set as S
8−import Control.Monad.State (State)
914import Data.UUID (UUID)
1015import Control.DeepSeq (NFData, rnf)
1116import Control.DeepSeq.Generics (genericRnf)
1217import GHC.Generics (Generic)
18+import GHC.Stack
1319import qualified Data.Vector as V
1420import qualified Data.List as L
1521import Data.Text (Text,unpack)
16−import Data.Binary
17−import Data.Vector.Binary()
1822import Data.Time.Clock
19−import Data.Time.Clock.POSIX
20−import Data.Time.Calendar (Day,toGregorian,fromGregorian)
2123import Data.Hashable.Time ()
24+import Data.Time.Calendar (Day)
2225import Data.Typeable
2326import Data.ByteString (ByteString)
24−import Data.Maybe (isJust)
27+import qualified Data.List.NonEmpty as NE
28+import Data.Vector.Instances ()
2529
2630type StringType = Text
31+
32+type DatabaseName = String
2733
2834-- | Database atoms are the smallest, undecomposable units of a tuple. Common examples are integers, text, or unique identity keys.
29−data Atom = IntAtom Int |
35+data Atom = IntegerAtom Integer |
36+ IntAtom Int |
3037 DoubleAtom Double |
3138 TextAtom Text |
3239 DayAtom Day |
@@ -34,13 +41,15 @@ data Atom = IntAtom Int |
3441 ByteStringAtom ByteString |
3542 BoolAtom Bool |
3643 RelationAtom Relation |
44+ RelationalExprAtom RelationalExpr | --used for returning inc deps
3745 ConstructedAtom DataConstructorName AtomType [Atom]
38− deriving (Eq, Show, Binary, Typeable, NFData, Generic)
46+ deriving (Eq, Show, Typeable, NFData, Generic, Read)
3947
4048instance Hashable Atom where
4149 hashWithSalt salt (ConstructedAtom dConsName _ atoms) = salt `hashWithSalt` atoms
4250 `hashWithSalt` dConsName --AtomType is not hashable
4351 hashWithSalt salt (IntAtom i) = salt `hashWithSalt` i
52+ hashWithSalt salt (IntegerAtom i) = salt `hashWithSalt` i
4453 hashWithSalt salt (DoubleAtom d) = salt `hashWithSalt` d
4554 hashWithSalt salt (TextAtom t) = salt `hashWithSalt` t
4655 hashWithSalt salt (DayAtom d) = salt `hashWithSalt` d
@@ -48,22 +57,12 @@ instance Hashable Atom where
4857 hashWithSalt salt (ByteStringAtom bs) = salt `hashWithSalt` bs
4958 hashWithSalt salt (BoolAtom b) = salt `hashWithSalt` b
5059 hashWithSalt salt (RelationAtom r) = salt `hashWithSalt` r
51−
52−instance Binary UTCTime where
53− put utc = put $ toRational (utcTimeToPOSIXSeconds utc)
54− get = do
55− r <- get :: Get Rational
56− return (posixSecondsToUTCTime (fromRational r))
57−
58−instance Binary Day where
59− put day = put $ toGregorian day
60− get = do
61− (y,m,d) <- get :: Get (Integer, Int, Int)
62− return (fromGregorian y m d)
60+ hashWithSalt salt (RelationalExprAtom re) = salt `hashWithSalt` re
6361
6462-- I suspect the definition of ConstructedAtomType with its name alone is insufficient to disambiguate the cases; for example, one could create a type named X, remove a type named X, and re-add it using different constructors. However, as long as requests are served from only one DatabaseContext at-a-time, the type name is unambiguous. This will become a problem for time-travel, however.
65−-- | The AtomType must uniquely identify the type of a atom.
66−data AtomType = IntAtomType |
63+-- | The AtomType uniquely identifies the type of a atom.
64+data AtomType = IntAtomType |
65+ IntegerAtomType |
6766 DoubleAtomType |
6867 TextAtomType |
6968 DayAtomType |
@@ -72,10 +71,15 @@ data AtomType = IntAtomType |
7271 BoolAtomType |
7372 RelationAtomType Attributes |
7473 ConstructedAtomType TypeConstructorName TypeVarMap |
75− AnyAtomType
74+ RelationalExprAtomType |
75+ TypeVariableType TypeVarName
7676 --wildcard used in Atom Functions and tuples for data constructors which don't provide all arguments to the type constructor
77− deriving (Eq, NFData, Generic, Binary, Show)
78−
77+ deriving (Eq, NFData, Generic, Show, Read, Hashable)
78+
79+instance Ord AtomType where
80+ compare = undefined
81+
82+-- this should probably be an ordered dictionary in order to be able to round-trip these arguments
7983type TypeVarMap = M.Map TypeVarName AtomType
8084
8185instance Hashable TypeVarMap where
@@ -86,46 +90,41 @@ isRelationAtomType :: AtomType -> Bool
8690isRelationAtomType (RelationAtomType _) = True
8791isRelationAtomType _ = False
8892
89−{-
90−atomTypeForAtom :: Atom -> AtomType
91−atomTypeForAtom (IntAtom _) = IntAtomType
92−atomTypeForAtom (DoubleAtom _) = DoubleAtomType
93−atomTypeForAtom (TextAtom _) = TextAtomType
94−atomTypeForAtom (DayAtom _) = DayAtomType
95−atomTypeForAtom (DateTimeAtom _) = DateTimeAtomType
96−atomTypeForAtom (ByteStringAtom _) = ByteStringAtomType
97−atomTypeForAtom (BoolAtom _) = BoolAtomType
98−atomTypeForAtom (RelationAtom (Relation attrs _)) = RelationAtomType attrs
99−atomTypeForAtom (ConstructedAtom _ aType _) = aType
100−-}
101−
10293-- | The AttributeName is the name of an attribute in a relation.
10394type AttributeName = StringType
10495
10596-- | A relation's type is composed of attribute names and types.
106−data Attribute = Attribute AttributeName AtomType deriving (Eq, Show, Generic)
97+data Attribute = Attribute AttributeName AtomType deriving (Eq, Show, Read, Generic, NFData)
10798
10899instance Hashable Attribute where
109100 hashWithSalt salt (Attribute attrName _) = hashWithSalt salt attrName
110101
111−instance NFData Attribute where rnf = genericRnf
112−
113−instance Binary Attribute
102+type AttributesHash = Int
114103
115104-- | 'Attributes' represent the head of a relation.
116−type Attributes = V.Vector Attribute
105+newtype Attributes = Attributes {
106+ attributesVec :: V.Vector Attribute
107+ --,attributesSet :: HS.HashSet Attribute --compare with this generated in heap profile and benchmarks
108+ }
109+ deriving (NFData, Read, Hashable, Generic)
110+
111+attributesSet :: Attributes -> HS.HashSet Attribute
112+attributesSet = HS.fromList . V.toList . attributesVec
113+
114+instance Show Attributes where
115+ show attrs = "attributesFromList [" <> L.intercalate ", " (map (\attr -> "(" <> show attr <> ")") (V.toList (attributesVec attrs))) <> "]"
116+
117+--when attribute ordering is irrelevant
118+instance Eq Attributes where
119+ attrsA == attrsB =
120+ attributesVec attrsA == attributesVec attrsB ||
121+ attributesSet attrsA == attributesSet attrsB
117122
118−-- | Equality function for a set of attributes.
119−attributesEqual :: Attributes -> Attributes -> Bool
120−attributesEqual attrs1 attrs2 = attrsAsSet attrs1 == attrsAsSet attrs2
121− where
122− attrsAsSet = HS.fromList . V.toList
123−
124123sortedAttributesIndices :: Attributes -> [(Int, Attribute)]
125−sortedAttributesIndices attrs = L.sortBy (\(_, (Attribute name1 _)) (_,(Attribute name2 _)) -> compare name1 name2) $ V.toList (V.indexed attrs)
124+sortedAttributesIndices attrs = L.sortBy (\(_, Attribute name1 _) (_,Attribute name2 _) -> compare name1 name2) $ V.toList (V.indexed (attributesVec attrs))
126125
127126-- | The relation's tuple set is the body of the relation.
128−newtype RelationTupleSet = RelationTupleSet { asList :: [RelationTuple] } deriving (Hashable, Show, Generic, Binary)
127+newtype RelationTupleSet = RelationTupleSet { asList :: [RelationTuple] } deriving (Hashable, Show, Generic, Read)
129128
130129instance Read Relation where
131130 readsPrec = error "relation read not supported"
@@ -141,36 +140,35 @@ instance NFData RelationTupleSet where rnf = genericRnf
141140instance Hashable RelationTuple where
142141 --sanity check the tuple for attribute and tuple counts
143142 --this bit me when tuples were being hashed before being verified
144− hashWithSalt salt (RelationTuple attrs tupVec) = if V.length attrs /= V.length tupVec then
145− error "invalid tuple: attributes and tuple count mismatch"
143+ hashWithSalt salt (RelationTuple attrs tupVec) = if V.length (attributesVec attrs) /= V.length tupVec then
144+ error ("invalid tuple: attributes and tuple count mismatch " <> show (attributesVec attrs, tupVec))
146145 else
147146 salt `hashWithSalt`
148147 sortedAttrs `hashWithSalt`
149− (V.toList sortedTupVec)
148+ V.toList sortedTupVec
150149 where
151150 sortedAttrsIndices = sortedAttributesIndices attrs
152151 sortedAttrs = map snd sortedAttrsIndices
153152 sortedTupVec = V.map (\(index, _) -> tupVec V.! index) $ V.fromList sortedAttrsIndices
154153
155154-- | A tuple is a set of attributes mapped to their 'Atom' values.
156−data RelationTuple = RelationTuple Attributes (V.Vector Atom) deriving (Show, Generic)
157−
158−instance Binary RelationTuple
155+data RelationTuple = RelationTuple Attributes (V.Vector Atom) deriving (Show, Read, Generic)
159156
160157instance Eq RelationTuple where
161− (==) tuple1@(RelationTuple attrs1 _) tuple2@(RelationTuple attrs2 _) = attributesEqual attrs1 attrs2 && atomsEqual
158+ tuple1@(RelationTuple attrs1 _) == tuple2@(RelationTuple attrs2 _) =
159+ attrs1 == attrs2 && atomsEqual
162160 where
163− atomForAttribute attr (RelationTuple attrs tupVec) = case V.findIndex (== attr) attrs of
164− Nothing -> Nothing
165− Just index -> tupVec V.!? index
166− atomsEqual = V.all (== True) $ V.map (\attr -> atomForAttribute attr tuple1 == atomForAttribute attr tuple2) attrs1
161+ atomForAttribute attr (RelationTuple attrs tupVec) = case V.findIndex (== attr) (attributesVec attrs) of
162+ Nothing -> Nothing
163+ Just index -> tupVec V.!? index
164+ atomsEqual = V.all (== True) $ V.map (\attr -> atomForAttribute attr tuple1 == atomForAttribute attr tuple2) (attributesVec attrs1)
167165
168166instance NFData RelationTuple where rnf = genericRnf
169167
170168data Relation = Relation Attributes RelationTupleSet deriving (Show, Generic,Typeable)
171169
172170instance Eq Relation where
173− Relation attrs1 tupSet1 == Relation attrs2 tupSet2 = attributesEqual attrs1 attrs2 && tupSet1 == tupSet2
171+ Relation attrs1 tupSet1 == Relation attrs2 tupSet2 = attrs1 == attrs2 && tupSet1 == tupSet2
174172
175173instance NFData Relation where rnf = genericRnf
176174
@@ -181,17 +179,18 @@ instance Hashable Relation where
181179 where
182180 sortedAttrs = map snd (sortedAttributesIndices attrs)
183181
184−instance Binary Relation
185−
182+-- | Used to represent the number of tuples in a relation.
186183data RelationCardinality = Countable | Finite Int deriving (Eq, Show, Generic, Ord)
187184
188185-- | Relation variables are identified by their names.
189186type RelVarName = StringType
190187
188+type RelationalExpr = RelationalExprBase ()
189+
191190-- | A relational expression represents query (read) operations on a database.
192−data RelationalExpr =
191+data RelationalExprBase a =
193192 --- | Create a relation from tuple expressions.
194− MakeRelationFromExprs (Maybe [AttributeExpr]) [TupleExpr] |
193+ MakeRelationFromExprs (Maybe [AttributeExprBase a]) (TupleExprsBase a) |
195194 --- | Create and reference a relation from attributes and a tuple set.
196195 MakeStaticRelation Attributes RelationTupleSet |
197196 --- | Reference an existing relation in Haskell-space.
@@ -200,29 +199,40 @@ data RelationalExpr =
200199 --in Tutorial D, relational variables pick up the type of the first relation assigned to them
201200 --relational variables should also be able to be explicitly-typed like in Haskell
202201 --- | Reference a relation variable by its name.
203− RelationVariable RelVarName |
202+ RelationVariable RelVarName a |
204203 --- | Create a projection over attribute names. (Note that the 'AttributeNames' structure allows for the names to be inverted.)
205− Project AttributeNames RelationalExpr |
204+ Project (AttributeNamesBase a) (RelationalExprBase a) |
206205 --- | Create a union of two relational expressions. The expressions should have identical attributes.
207− Union RelationalExpr RelationalExpr |
206+ Union (RelationalExprBase a) (RelationalExprBase a) |
208207 --- | Create a join of two relational expressions. The join occurs on attributes which are identical. If the expressions have no overlapping attributes, the join becomes a cross-product of both tuple sets.
209− Join RelationalExpr RelationalExpr |
208+ Join (RelationalExprBase a) (RelationalExprBase a) |
210209 --- | Rename an attribute (first argument) to another (second argument).
211− Rename AttributeName AttributeName RelationalExpr |
210+ Rename AttributeName AttributeName (RelationalExprBase a) |
212211 --- | Return a relation containing all tuples of the first argument which do not appear in the second argument (minus).
213− Difference RelationalExpr RelationalExpr |
212+ Difference (RelationalExprBase a) (RelationalExprBase a) |
214213 --- | Create a sub-relation composed of the first argument's attributes which will become an attribute of the result expression. The unreferenced attributes are not altered in the result but duplicate tuples in the projection of the expression minus the attribute names are compressed into one. For more information, <https://github.com/agentm/project-m36/blob/master/docs/introduction_to_the_relational_algebra.markdown#group read the relational algebra tutorial.>
215− Group AttributeNames AttributeName RelationalExpr |
214+ Group (AttributeNamesBase a) AttributeName (RelationalExprBase a) |
216215 --- | Create an expression to unwrap a sub-relation contained within at an attribute's name. Note that this is not always an inverse of a group operation.
217− Ungroup AttributeName RelationalExpr |
216+ Ungroup AttributeName (RelationalExprBase a) |
218217 --- | Filter the tuples of the relational expression to only retain the tuples which evaluate against the restriction predicate to true.
219− Restrict RestrictionPredicateExpr RelationalExpr |
218+ Restrict (RestrictionPredicateExprBase a) (RelationalExprBase a) |
220219 --- | Returns the true relation iff
221− Equals RelationalExpr RelationalExpr |
222− NotEquals RelationalExpr RelationalExpr |
223− Extend ExtendTupleExpr RelationalExpr
220+ Equals (RelationalExprBase a) (RelationalExprBase a) |
221+ NotEquals (RelationalExprBase a) (RelationalExprBase a) |
222+ Extend (ExtendTupleExprBase a) (RelationalExprBase a) |
224223 --Summarize :: AtomExpr -> AttributeName -> RelationalExpr -> RelationalExpr -> RelationalExpr -- a special case of Extend
225− deriving (Show, Eq, Generic, Binary)
224+ --Evaluate relationalExpr with scoped views
225+ With [(WithNameExprBase a, RelationalExprBase a)] (RelationalExprBase a)
226+ deriving (Show, Read, Eq, Generic, NFData, Foldable, Functor, Traversable)
227+
228+instance Hashable RelationalExpr
229+
230+data WithNameExprBase a = WithNameExpr RelVarName a
231+ deriving (Show, Read, Eq, Generic, NFData, Foldable, Functor, Traversable, Hashable)
232+
233+type WithNameExpr = WithNameExprBase ()
234+
235+type GraphRefWithNameExpr = WithNameExprBase GraphRefTransactionMarker
226236
227237type NotificationName = StringType
228238type Notifications = M.Map NotificationName Notification
@@ -230,26 +240,26 @@ type Notifications = M.Map NotificationName Notification
230240-- | When the changeExpr returns a different result in the database context, then the reportExpr is triggered and sent asynchronously to all clients.
231241data Notification = Notification {
232242 changeExpr :: RelationalExpr,
233− reportExpr :: RelationalExpr
243+ reportOldExpr :: RelationalExpr, --run the expression in the pre-change context
244+ reportNewExpr :: RelationalExpr --run the expression in the post-change context
234245 }
235− deriving (Show, Eq, Binary, Generic)
246+ deriving (Show, Eq, Generic, NFData)
236247
237248type TypeVarName = StringType
238249
239−-- | "data Either a b"
250+-- | Metadata definition for type constructors such as @data Either a b@.
240251data TypeConstructorDef = ADTypeConstructorDef TypeConstructorName [TypeVarName] |
241252 PrimitiveTypeConstructorDef TypeConstructorName AtomType
242− deriving (Show, Generic, Binary, Eq, NFData)
253+ deriving (Show, Generic, Eq, NFData, Hashable, Read)
243254
244255-- | Found in data constructors and type declarations: Left (Either Int Text) | Right Int
245−data TypeConstructor = ADTypeConstructor TypeConstructorName [TypeConstructorArg] |
246− PrimitiveTypeConstructor TypeConstructorName AtomType
247− deriving (Show, Generic, Binary, Eq, NFData)
248−
249−data TypeConstructorArg = TypeConstructorArg TypeConstructor |
250− TypeConstructorTypeVarArg TypeVarName
251− deriving (Show, Generic, Binary, Eq, NFData)
252−
256+type TypeConstructor = TypeConstructorBase ()
257+data TypeConstructorBase a = ADTypeConstructor TypeConstructorName [TypeConstructor] |
258+ PrimitiveTypeConstructor TypeConstructorName AtomType |
259+ RelationAtomTypeConstructor [AttributeExprBase a] |
260+ TypeVariable TypeVarName
261+ deriving (Show, Generic, Eq, NFData, Hashable, Read)
262+
253263type TypeConstructorMapping = [(TypeConstructorDef, DataConstructorDefs)]
254264
255265type TypeConstructorName = StringType
@@ -257,48 +267,85 @@ type TypeConstructorArgName = StringType
257267type DataConstructorName = StringType
258268type AtomTypeName = StringType
259269
260−-- | Used to define a data constructor in a type constructor context. (Left a | Right b)
261−data DataConstructorDef = DataConstructorDef DataConstructorName [DataConstructorDefArg] deriving (Eq, Show, Binary, Generic)
270+-- | Used to define a data constructor in a type constructor context such as @Left a | Right b@
271+data DataConstructorDef = DataConstructorDef DataConstructorName [DataConstructorDefArg] deriving (Eq, Show, Generic, NFData, Hashable, Read)
262272
263273type DataConstructorDefs = [DataConstructorDef]
264274
265275data DataConstructorDefArg = DataConstructorDefTypeConstructorArg TypeConstructor |
266276 DataConstructorDefTypeVarNameArg TypeVarName
267− deriving (Show, Generic, Binary, Eq, NFData)
277+ deriving (Show, Generic, Eq, NFData, Hashable, Read)
268278
269279type InclusionDependencies = M.Map IncDepName InclusionDependency
270−type RelationVariables = M.Map RelVarName Relation
271−
280+type RelationVariables = M.Map RelVarName GraphRefRelationalExpr
281+
282+data GraphRefTransactionMarker = TransactionMarker TransactionId |
283+ UncommittedContextMarker
284+ deriving (Eq, Show, Generic, NFData, Ord)
285+
286+-- a fundamental relational expr to which other relational expressions compile
287+type GraphRefRelationalExpr = RelationalExprBase GraphRefTransactionMarker
288+
289+type SchemaName = StringType
290+
291+type Subschemas = M.Map SchemaName Schema
292+
293+-- | Every transaction has one concrete database context and any number of isomorphic subschemas.
294+data Schemas = Schemas DatabaseContext Subschemas
295+ deriving (Generic)
296+
272297-- | The DatabaseContext is a snapshot of a database's evolving state and contains everything a database client can change over time.
273−data DatabaseContext = DatabaseContext {
298+-- I spent some time thinking about whether the VirtualDatabaseContext/Schema and DatabaseContext data constructors should be the same constructor, but that would allow relation variables to be created in a "virtual" context which would appear to defeat the isomorphisms of the contexts. It should be possible to switch to an alternative schema to view the same equivalent information without information loss. However, allowing all contexts to reference another context while maintaining its own relation variables, new types, etc. could be interesting from a security perspective. For example, if a user creates a new relvar in a virtual context, then does it necessarily appear in all linked contexts? After deliberation, I think the relvar should appear in *all* linked contexts to retain the isomorphic properties, even when the isomorphism is for a subset of the context. This hints that the IsoMorphs should allow for "fall-through"; that is, when a relvar is not defined in the virtual context (for morphing), then the lookup should fall through to the underlying context.
299+newtype Schema = Schema SchemaIsomorphs
300+ deriving (Generic)
301+
302+data SchemaIsomorph = IsoRestrict RelVarName RestrictionPredicateExpr (RelVarName, RelVarName) |
303+ IsoRename RelVarName RelVarName |
304+ IsoUnion (RelVarName, RelVarName) RestrictionPredicateExpr RelVarName --maps two relvars to one relvar
305+ -- IsoTypeConstructor in morphAttrExpr
306+ deriving (Generic, Show)
307+
308+type SchemaIsomorphs = [SchemaIsomorph]
309+
310+data DatabaseContext = DatabaseContext {
274311 inclusionDependencies :: InclusionDependencies,
275312 relationVariables :: RelationVariables,
276313 atomFunctions :: AtomFunctions,
314+ dbcFunctions :: DatabaseContextFunctions,
277315 notifications :: Notifications,
278316 typeConstructorMapping :: TypeConstructorMapping
279− } deriving (Show, Generic)
317+ } deriving (NFData, Generic)
280318
281319type IncDepName = StringType
282320
283−-- | Inclusion dependencies represent every possible database constraints. Constraints enforce specific, arbitrarily-complex rules to which the database context must adhere.
284−data InclusionDependency = InclusionDependency RelationalExpr RelationalExpr deriving (Show, Eq, Generic)
321+-- | Inclusion dependencies represent every possible database constraint. Constraints enforce specific, arbitrarily-complex rules to which the database context's relation variables must adhere unconditionally.
322+data InclusionDependency = InclusionDependency RelationalExpr RelationalExpr deriving (Show, Eq, Generic, NFData, Hashable, Read)
323+
324+type AttributeNameAtomExprMap = M.Map AttributeName AtomExpr
325+
326+--used for returning information about individual expressions
327+type DatabaseContextExprName = StringType
285328
286−instance Binary InclusionDependency
329+type DatabaseContextExpr = DatabaseContextExprBase ()
330+
331+instance Hashable DatabaseContextExpr
332+
333+type GraphRefDatabaseContextExpr = DatabaseContextExprBase GraphRefTransactionMarker
287334
288335-- | Database context expressions modify the database context.
289−data DatabaseContextExpr =
336+data DatabaseContextExprBase a =
290337 NoOperation |
291− Define RelVarName [AttributeExpr] |
338+ Define RelVarName [AttributeExprBase a] |
292339 Undefine RelVarName | --forget existence of relvar X
293− Assign RelVarName RelationalExpr |
294− Insert RelVarName RelationalExpr |
295− Delete RelVarName RestrictionPredicateExpr |
296− Update RelVarName (M.Map AttributeName AtomExpr) RestrictionPredicateExpr |
340+ Assign RelVarName (RelationalExprBase a) |
341+ Insert RelVarName (RelationalExprBase a) |
342+ Delete RelVarName (RestrictionPredicateExprBase a) |
343+ Update RelVarName AttributeNameAtomExprMap (RestrictionPredicateExprBase a) |
297344
298345 AddInclusionDependency IncDepName InclusionDependency |
299346 RemoveInclusionDependency IncDepName |
300347
301− AddNotification NotificationName RelationalExpr RelationalExpr |
348+ AddNotification NotificationName RelationalExpr RelationalExpr RelationalExpr |
302349 RemoveNotification NotificationName |
303350
304351 AddTypeConstructor TypeConstructorDef [DataConstructorDef] |
@@ -307,27 +354,48 @@ data DatabaseContextExpr =
307354 --adding an AtomFunction is not a pure operation (required loading GHC modules)
308355 RemoveAtomFunction AtomFunctionName |
309356
310− MultipleExpr [DatabaseContextExpr]
311− deriving (Show, Eq, Binary, Generic)
357+ RemoveDatabaseContextFunction DatabaseContextFunctionName |
358+
359+ ExecuteDatabaseContextFunction DatabaseContextFunctionName [AtomExprBase a] |
360+
361+ MultipleExpr [DatabaseContextExprBase a]
362+ deriving (Show, Read, Eq, Generic, NFData)
363+
364+instance Hashable (M.Map AttributeName AtomExpr) where
365+ hashWithSalt salt m = salt `hashWithSalt` M.toList m
312366
367+type ObjModuleName = StringType
368+type ObjFunctionName = StringType
369+type Range = (Int,Int)
313370-- | Adding an atom function should be nominally a DatabaseExpr except for the fact that it cannot be performed purely. Thus, we create the DatabaseContextIOExpr.
314−data DatabaseContextIOExpr = AddAtomFunction AtomFunctionName [TypeConstructor] AtomFunctionBodyScript
315− deriving (Show, Eq, Generic, Binary)
371+data DatabaseContextIOExprBase a =
372+ AddAtomFunction AtomFunctionName [TypeConstructor] AtomFunctionBodyScript |
373+ LoadAtomFunctions ObjModuleName ObjFunctionName FilePath |
374+ AddDatabaseContextFunction DatabaseContextFunctionName [TypeConstructor] DatabaseContextFunctionBodyScript |
375+ LoadDatabaseContextFunctions ObjModuleName ObjFunctionName FilePath |
376+ CreateArbitraryRelation RelVarName [AttributeExprBase a] Range
377+ deriving (Show, Eq, Generic)
316378
317−type DatabaseState a = State DatabaseContext a
379+type GraphRefDatabaseContextIOExpr = DatabaseContextIOExprBase GraphRefTransactionMarker
318380
319−-- | Restriction predicate are boolean algebra components which, when composed, indicate whether or not a tuple should be retained during a restriction (filtering) operation.
320−data RestrictionPredicateExpr =
321− TruePredicate |
322− AndPredicate RestrictionPredicateExpr RestrictionPredicateExpr |
323− OrPredicate RestrictionPredicateExpr RestrictionPredicateExpr |
324− NotPredicate RestrictionPredicateExpr |
325− RelationalExprPredicate RelationalExpr | --type must be same as true and false relations (no attributes)
326− AtomExprPredicate AtomExpr | --atom must evaluate to boolean
327− AttributeEqualityPredicate AttributeName AtomExpr -- relationalexpr must result in relation with single tuple
328− deriving (Show, Eq, Generic)
381+type DatabaseContextIOExpr = DatabaseContextIOExprBase ()
329382
330−instance Binary RestrictionPredicateExpr
383+type RestrictionPredicateExpr = RestrictionPredicateExprBase ()
384+
385+instance Hashable RestrictionPredicateExpr
386+
387+type GraphRefRestrictionPredicateExpr = RestrictionPredicateExprBase GraphRefTransactionMarker
388+
389+-- | Restriction predicates are boolean algebra components which, when composed, indicate whether or not a tuple should be retained during a restriction (filtering) operation.
390+data RestrictionPredicateExprBase a =
391+ TruePredicate |
392+ AndPredicate (RestrictionPredicateExprBase a) (RestrictionPredicateExprBase a) |
393+ OrPredicate (RestrictionPredicateExprBase a) (RestrictionPredicateExprBase a) |
394+ NotPredicate (RestrictionPredicateExprBase a) |
395+ RelationalExprPredicate (RelationalExprBase a) | --type must be same as true and false relations (no attributes)
396+ AtomExprPredicate (AtomExprBase a) | --atom must evaluate to boolean
397+ AttributeEqualityPredicate AttributeName (AtomExprBase a) -- relationalexpr must result in relation with single tuple
398+ deriving (Show, Read, Eq, Generic, NFData, Foldable, Functor, Traversable)
331399
332400-- child + parent links
333401-- | A transaction graph's head name references the leaves of the transaction graph and can be used during session creation to indicate at which point in the graph commits should persist.
@@ -337,61 +405,79 @@ type TransactionHeads = M.Map HeadName Transaction
337405
338406-- | The transaction graph is the global database's state which references every committed transaction.
339407data TransactionGraph = TransactionGraph TransactionHeads (S.Set Transaction)
340− deriving (Show, Eq)
341−
342−transactionsForGraph :: TransactionGraph -> S.Set Transaction
343−transactionsForGraph (TransactionGraph _ t) = t
408+ deriving Generic
344409
345410transactionHeadsForGraph :: TransactionGraph -> TransactionHeads
346−transactionHeadsForGraph (TransactionGraph heads _) = heads
411+transactionHeadsForGraph (TransactionGraph hs _) = hs
412+
413+transactionsForGraph :: TransactionGraph -> S.Set Transaction
414+transactionsForGraph (TransactionGraph _ ts) = ts
347415
348416-- | Every transaction has context-specific information attached to it.
349−data TransactionInfo = TransactionInfo TransactionId (S.Set TransactionId) | -- 1 parent + n children
350− MergeTransactionInfo TransactionId TransactionId (S.Set TransactionId) -- 2 parents, n children
351− deriving(Show, Generic)
352−
353−instance Binary TransactionInfo
417+-- The `TransactionDiff`s represent child/edge relationships to previous transactions (branches or continuations of the same branch).
418+data TransactionInfo = TransactionInfo {
419+ parents :: TransactionParents,
420+ stamp :: UTCTime,
421+ merkleHash :: MerkleHash
422+ } deriving (Show, Generic)
423+
424+type TransactionParents = NE.NonEmpty TransactionId
425+{-
426+data TransactionInfo = TransactionInfo TransactionId TransactionDiffs UTCTime | -- 1 parent + n children
427+ MergeTransactionInfo TransactionId TransactionId TransactionDiffs UTCTime -- 2 parents, n children
428+ deriving (Show, Generic)
429+-}
354430
355431-- | Every set of modifications made to the database are atomically committed to the transaction graph as a transaction.
356432type TransactionId = UUID
357433
358−data Transaction = Transaction TransactionId TransactionInfo DatabaseContext -- self uuid
359− deriving (Show, Generic)
360−
361−--instance Binary Transaction
434+data Transaction = Transaction TransactionId TransactionInfo Schemas
435+ deriving Generic
362436
363437-- | The disconnected transaction represents an in-progress workspace used by sessions before changes are committed. This is similar to git's "index". After a transaction is committed, it is "connected" in the transaction graph and can no longer be modified.
364−data DisconnectedTransaction = DisconnectedTransaction TransactionId DatabaseContext --parentID, context
438+data DisconnectedTransaction = DisconnectedTransaction TransactionId Schemas DirtyFlag
439+--the database context expression represents a difference between the disconnected transaction and its immutable parent transaction- is this diff expr used at all?
440+
441+type DirtyFlag = Bool
442+
443+type TransactionDiffExpr = DatabaseContextExpr
365444
366445transactionId :: Transaction -> TransactionId
367446transactionId (Transaction tid _ _) = tid
368447
369−transactionContext :: Transaction -> DatabaseContext
370−transactionContext (Transaction _ _ context) = context
371−
372448transactionInfo :: Transaction -> TransactionInfo
373449transactionInfo (Transaction _ info _) = info
374−
450+
375451instance Eq Transaction where
376452 (Transaction uuidA _ _) == (Transaction uuidB _ _) = uuidA == uuidB
377453
378454instance Ord Transaction where
379455 compare (Transaction uuidA _ _) (Transaction uuidB _ _) = compare uuidA uuidB
380456
457+type AtomExpr = AtomExprBase ()
458+
459+instance Hashable AtomExpr
460+
461+type GraphRefAtomExpr = AtomExprBase GraphRefTransactionMarker
462+
381463-- | An atom expression represents an action to take when extending a relation or when statically defining a relation or a new tuple.
382−data AtomExpr = AttributeAtomExpr AttributeName |
383− NakedAtomExpr Atom |
384− FunctionAtomExpr AtomFunctionName [AtomExpr] |
385− RelationAtomExpr RelationalExpr |
386− ConstructedAtomExpr DataConstructorName [AtomExpr]
387− deriving (Eq,Show,Generic)
464+data AtomExprBase a = AttributeAtomExpr AttributeName |
465+ NakedAtomExpr Atom |
466+ FunctionAtomExpr AtomFunctionName [AtomExprBase a] a |
467+ RelationAtomExpr (RelationalExprBase a) |
468+ ConstructedAtomExpr DataConstructorName [AtomExprBase a] a
469+ deriving (Eq, Show, Read, Generic, NFData, Foldable, Functor, Traversable)
388470
389−instance Binary AtomExpr
390−
391471-- | Used in tuple creation when creating a relation.
392−data ExtendTupleExpr = AttributeExtendTupleExpr AttributeName AtomExpr
393− deriving (Show, Eq, Binary, Generic)
394−
472+data ExtendTupleExprBase a = AttributeExtendTupleExpr AttributeName (AtomExprBase a)
473+ deriving (Show, Read, Eq, Generic, NFData, Foldable, Functor, Traversable)
474+
475+type ExtendTupleExpr = ExtendTupleExprBase ()
476+
477+instance Hashable ExtendTupleExpr
478+
479+type GraphRefExtendTupleExpr = ExtendTupleExprBase GraphRefTransactionMarker
480+
395481--enumerates the list of functions available to be run as part of tuple expressions
396482type AtomFunctions = HS.HashSet AtomFunction
397483
@@ -399,9 +485,13 @@ type AtomFunctionName = StringType
399485
400486type AtomFunctionBodyScript = StringType
401487
402−type AtomFunctionBodyType = [Atom] -> Atom
488+type AtomFunctionBodyType = [Atom] -> Either AtomFunctionError Atom
403489
404490data AtomFunctionBody = AtomFunctionBody (Maybe AtomFunctionBodyScript) AtomFunctionBodyType
491+ deriving Generic
492+
493+instance NFData AtomFunctionBody where
494+ rnf (AtomFunctionBody mScript _) = rnf mScript
405495
406496instance Show AtomFunctionBody where
407497 show (AtomFunctionBody mScript _) = case mScript of
@@ -413,37 +503,36 @@ data AtomFunction = AtomFunction {
413503 atomFuncName :: AtomFunctionName,
414504 atomFuncType :: [AtomType],
415505 atomFuncBody :: AtomFunctionBody
416− }
417−
506+ } deriving (Generic, NFData)
507+
418508instance Hashable AtomFunction where
419− hashWithSalt salt func = salt `hashWithSalt` (atomFuncName func)
509+ hashWithSalt salt func = salt `hashWithSalt` atomFuncName func
420510
421511instance Eq AtomFunction where
422− f1 == f2 = let (AtomFunctionBody mScript1 _) = atomFuncBody f1
423− (AtomFunctionBody mScript2 _) = atomFuncBody f2 in
424− if atomFuncName f1 == atomFuncName f2 then
425− if isJust mScript1 then
426− if mScript1 == mScript2 then
427− True
428− else
429− False
430− else
431− True
432− else
433− False
512+ f1 == f2 = atomFuncName f1 == atomFuncName f2
434513
435514instance Show AtomFunction where
436515 show aFunc = unpack (atomFuncName aFunc) ++ "::" ++ showArgTypes ++ "; " ++ body
437516 where
438517 body = show (atomFuncBody aFunc)
439− showArgTypes = concat (L.intersperse "->" $ map show (atomFuncType aFunc))
518+ showArgTypes = L.intercalate "->" (map show (atomFuncType aFunc))
440519
441520-- | The 'AttributeNames' structure represents a set of attribute names or the same set of names but inverted in the context of a relational expression. For example, if a relational expression has attributes named "a", "b", and "c", the 'InvertedAttributeNames' of ("a","c") is ("b").
442−data AttributeNames = AttributeNames (S.Set AttributeName) |
443− InvertedAttributeNames (S.Set AttributeName)
444− deriving (Eq, Show, Generic)
445−
446−instance Binary AttributeNames
521+data AttributeNamesBase a = AttributeNames (S.Set AttributeName) |
522+ InvertedAttributeNames (S.Set AttributeName) |
523+ UnionAttributeNames (AttributeNamesBase a) (AttributeNamesBase a) |
524+ IntersectAttributeNames (AttributeNamesBase a) (AttributeNamesBase a) |
525+ RelationalExprAttributeNames (RelationalExprBase a) -- use attribute names from the relational expression's type
526+ deriving (Eq, Show, Read, Generic, NFData, Foldable, Functor, Traversable)
527+
528+instance Hashable AttributeNames
529+
530+instance Hashable (S.Set AttributeName) where
531+ hashWithSalt salt s = salt `hashWithSalt` S.toList s
532+
533+type AttributeNames = AttributeNamesBase ()
534+
535+type GraphRefAttributeNames = AttributeNamesBase GraphRefTransactionMarker
447536
448537-- | The persistence strategy is a global database option which represents how to persist the database in the filesystem, if at all.
449538data PersistenceStrategy = NoPersistence | -- ^ no filesystem persistence/memory-only database
@@ -451,12 +540,32 @@ data PersistenceStrategy = NoPersistence | -- ^ no filesystem persistence/memory
451540 CrashSafePersistence FilePath -- ^ full fsync to disk (flushes kernel and physical drive buffers to ensure that the transaction is on non-volatile storage)
452541 deriving (Show, Read)
453542
454−data AttributeExpr = AttributeAndTypeNameExpr AttributeName TypeConstructor |
455− NakedAttributeExpr Attribute
456− deriving (Eq, Show, Generic, Binary)
543+type AttributeExpr = AttributeExprBase ()
544+type GraphRefAttributeExpr = AttributeExprBase GraphRefTransactionMarker
545+
546+-- | Create attributes dynamically.
547+data AttributeExprBase a = AttributeAndTypeNameExpr AttributeName TypeConstructor a |
548+ NakedAttributeExpr Attribute
549+ deriving (Eq, Show, Read, Generic, NFData, Foldable, Functor, Traversable, Hashable)
457550
458−data TupleExpr = TupleExpr (M.Map AttributeName AtomExpr)
459− deriving (Eq, Show, Generic, Binary)
551+-- | Dynamically create a tuple from attribute names and 'AtomExpr's.
552+newtype TupleExprBase a = TupleExpr (M.Map AttributeName (AtomExprBase a))
553+ deriving (Eq, Show, Read, Generic, NFData, Foldable, Functor, Traversable)
554+
555+instance Hashable TupleExpr
556+
557+type TupleExpr = TupleExprBase ()
558+
559+type GraphRefTupleExpr = TupleExprBase GraphRefTransactionMarker
560+
561+data TupleExprsBase a = TupleExprs a [TupleExprBase a]
562+ deriving (Eq, Show, Read, Generic, NFData, Foldable, Functor, Traversable)
563+
564+instance Hashable TupleExprs
565+
566+type GraphRefTupleExprs = TupleExprsBase GraphRefTransactionMarker
567+
568+type TupleExprs = TupleExprsBase ()
460569
461570data MergeStrategy =
462571 -- | After a union merge, the merge transaction is a result of union'ing relvars of the same name, introducing all uniquely-named relvars, union of constraints, union of atom functions, notifications, and types (unless the names and definitions collide, e.g. two types of the same name with different definitions)
@@ -465,4 +574,73 @@ data MergeStrategy =
465574 UnionPreferMergeStrategy HeadName |
466575 -- | Similar to the our/theirs merge strategy in git, the merge transaction's context is identical to that of the last transaction in the selected branch.
467576 SelectedBranchMergeStrategy HeadName
468− deriving (Eq, Show, Binary, Generic, NFData)
577+ deriving (Eq, Show, Generic, NFData)
578+
579+type DatabaseContextFunctionName = StringType
580+
581+type DatabaseContextFunctionBodyScript = StringType
582+
583+type DatabaseContextFunctionBodyType = [Atom] -> DatabaseContext -> Either DatabaseContextFunctionError DatabaseContext
584+
585+data DatabaseContextFunctionBody = DatabaseContextFunctionBody (Maybe DatabaseContextFunctionBodyScript) DatabaseContextFunctionBodyType
586+
587+instance NFData DatabaseContextFunctionBody where
588+ rnf (DatabaseContextFunctionBody mScript _) = rnf mScript
589+
590+data DatabaseContextFunction = DatabaseContextFunction {
591+ dbcFuncName :: DatabaseContextFunctionName,
592+ dbcFuncType :: [AtomType],
593+ dbcFuncBody :: DatabaseContextFunctionBody
594+ } deriving (Generic, NFData)
595+
596+type DatabaseContextFunctions = HS.HashSet DatabaseContextFunction
597+
598+instance Hashable DatabaseContextFunction where
599+ hashWithSalt salt func = salt `hashWithSalt` dbcFuncName func
600+
601+instance Eq DatabaseContextFunction where
602+ f1 == f2 = dbcFuncName f1 == dbcFuncName f2
603+
604+attrTypeVars :: Attribute -> S.Set TypeVarName
605+attrTypeVars (Attribute _ aType) = case aType of
606+ IntAtomType -> S.empty
607+ IntegerAtomType -> S.empty
608+ DoubleAtomType -> S.empty
609+ TextAtomType -> S.empty
610+ DayAtomType -> S.empty
611+ DateTimeAtomType -> S.empty
612+ ByteStringAtomType -> S.empty
613+ BoolAtomType -> S.empty
614+ RelationalExprAtomType -> S.empty
615+ (RelationAtomType attrs) -> S.unions (map attrTypeVars (V.toList (attributesVec attrs)))
616+ (ConstructedAtomType _ tvMap) -> M.keysSet tvMap
617+ (TypeVariableType nam) -> S.singleton nam
618+
619+typeVars :: TypeConstructor -> S.Set TypeVarName
620+typeVars (PrimitiveTypeConstructor _ _) = S.empty
621+typeVars (ADTypeConstructor _ args) = S.unions (map typeVars args)
622+typeVars (TypeVariable v) = S.singleton v
623+typeVars (RelationAtomTypeConstructor attrExprs) = S.unions (map attrExprTypeVars attrExprs)
624+
625+attrExprTypeVars :: AttributeExprBase a -> S.Set TypeVarName
626+attrExprTypeVars (AttributeAndTypeNameExpr _ tCons _) = typeVars tCons
627+attrExprTypeVars (NakedAttributeExpr attr) = attrTypeVars attr
628+
629+atomTypeVars :: AtomType -> S.Set TypeVarName
630+atomTypeVars IntAtomType = S.empty
631+atomTypeVars IntegerAtomType = S.empty
632+atomTypeVars DoubleAtomType = S.empty
633+atomTypeVars TextAtomType = S.empty
634+atomTypeVars DayAtomType = S.empty
635+atomTypeVars DateTimeAtomType = S.empty
636+atomTypeVars ByteStringAtomType = S.empty
637+atomTypeVars BoolAtomType = S.empty
638+atomTypeVars RelationalExprAtomType = S.empty
639+atomTypeVars (RelationAtomType attrs) = S.unions (map attrTypeVars (V.toList (attributesVec attrs)))
640+atomTypeVars (ConstructedAtomType _ tvMap) = M.keysSet tvMap
641+atomTypeVars (TypeVariableType nam) = S.singleton nam
642+
643+unimplemented :: HasCallStack => a
644+unimplemented = error "unimplemented"
645+
646+makeBaseFunctor ''RelationalExprBase
src/lib/ProjectM36/Client.hs+847−330
@@ -1,25 +1,42 @@
1−{-# LANGUAGE DeriveAnyClass, DeriveGeneric, ScopedTypeVariables #-}
1+{-# LANGUAGE DeriveGeneric, ScopedTypeVariables, MonoLocalBinds, DerivingVia #-}
2+{-|
3+Module: ProjectM36.Client
4+
5+Client interface to local and remote Project:M36 databases. To get started, connect with 'connectProjectM36', then run some database changes with 'executeDatabaseContextExpr', and issue queries using 'executeRelationalExpr'.
6+-}
27module ProjectM36.Client
38 (ConnectionInfo(..),
49 Connection(..),
510 Port,
611 Hostname,
12+ ServiceName,
713 DatabaseName,
8− ConnectionError,
14+ ConnectionError(..),
915 connectProjectM36,
1016 close,
17+ closeRemote_,
1118 executeRelationalExpr,
1219 executeDatabaseContextExpr,
13− executeDatabaseContextIOExpr,
20+ executeDatabaseContextIOExpr,
21+ executeDataFrameExpr,
1422 executeGraphExpr,
23+ executeSchemaExpr,
24+ executeTransGraphRelationalExpr,
1525 commit,
1626 rollback,
1727 typeForRelationalExpr,
1828 inclusionDependencies,
29+ ProjectM36.Client.typeConstructorMapping,
30+ ProjectM36.Client.databaseContextFunctionsAsRelation,
1931 planForDatabaseContextExpr,
20− processPersistence,
32+ currentSchemaName,
33+ SchemaName,
34+ HeadName,
35+ setCurrentSchemaName,
2136 transactionGraphAsRelation,
2237 relationVariablesAsRelation,
38+ ProjectM36.Client.atomFunctionsAsRelation,
39+ disconnectedTransactionIsDirty,
2340 headName,
2441 remoteDBLookupName,
2542 defaultServerPort,
@@ -27,19 +44,29 @@ module ProjectM36.Client
2744 defaultDatabaseName,
2845 defaultRemoteConnectionInfo,
2946 defaultHeadName,
47+ addClientNode,
3048 PersistenceStrategy(..),
31− RelationalExpr(..),
32− DatabaseContextExpr(..),
49+ RelationalExpr,
50+ RelationalExprBase(..),
51+ DatabaseContextExprBase(..),
52+ DatabaseContextExpr,
53+ DatabaseContextIOExprBase(..),
54+ DatabaseContextIOExpr,
3355 Attribute(..),
56+ MergeStrategy(..),
3457 attributesFromList,
35− createNodeId,
3658 createSessionAtCommit,
3759 createSessionAtHead,
3860 closeSession,
39− addClientNode,
61+ callTestTimeout_,
4062 RelationCardinality(..),
4163 TransactionGraphOperator(..),
42− NodeId(..),
64+ ProjectM36.Client.autoMergeToHead,
65+ transactionGraph_,
66+ disconnectedTransaction_,
67+ TransGraphRelationalExpr,
68+ TransactionIdLookup(..),
69+ TransactionIdHeadBacktrack(..),
4370 Atom(..),
4471 Session,
4572 SessionId,
@@ -47,56 +74,100 @@ module ProjectM36.Client
4774 emptyNotificationCallback,
4875 EvaluatedNotification(..),
4976 atomTypesAsRelation,
50− AttributeExpr(..),
51− TypeConstructor(..),
52− AtomType(..)) where
77+ AttributeExpr,
78+ inclusionDependencyForKey,
79+ databaseContextExprForUniqueKey,
80+ databaseContextExprForForeignKey,
81+ createScriptedAtomFunction,
82+ ProjectM36.Client.validateMerkleHashes,
83+ AttributeExprBase(..),
84+ TypeConstructorBase(..),
85+ TypeConstructorDef(..),
86+ DataConstructorDef(..),
87+ AttributeNamesBase(..),
88+ RelVarName,
89+ IncDepName,
90+ InclusionDependency(..),
91+ AttributeName,
92+ DF.DataFrame,
93+ DF.DataFrameExpr,
94+ DF.AttributeOrderExpr,
95+ DF.Order(..),
96+ RelationalError(..),
97+ RequestTimeoutException(..),
98+ RemoteProcessDiedException(..),
99+ AtomType(..),
100+ Atomable(..),
101+ TupleExprBase(..),
102+ TupleExprsBase(..),
103+ AtomExprBase(..),
104+ RestrictionPredicateExprBase(..),
105+ withTransaction
106+ ) where
53107import ProjectM36.Base hiding (inclusionDependencies) --defined in this module as well
54108import qualified ProjectM36.Base as B
109+import ProjectM36.Serialise.Error ()
55110import ProjectM36.Error
111+import ProjectM36.Atomable
112+import ProjectM36.AtomFunction as AF
56113import ProjectM36.StaticOptimizer
114+import ProjectM36.Key
115+import qualified ProjectM36.DataFrame as DF
116+import ProjectM36.DatabaseContextFunction as DCF
117+import qualified ProjectM36.IsomorphicSchema as Schema
57118import Control.Monad.State
58119import qualified ProjectM36.RelationalExpression as RE
59120import ProjectM36.DatabaseContext (basicDatabaseContext)
60−import ProjectM36.TransactionGraph
121+import qualified ProjectM36.TransactionGraph as Graph
122+import ProjectM36.TransactionGraph as TG
123+import qualified ProjectM36.Transaction as Trans
61124import ProjectM36.TransactionGraph.Persist
62−import ProjectM36.Attribute hiding (atomTypes)
125+import ProjectM36.Attribute
126+import ProjectM36.TransGraphRelationalExpression as TGRE (TransGraphRelationalExpr)
63127import ProjectM36.Persist (DiskSync(..))
128+import ProjectM36.FileLock
129+import ProjectM36.NormalizeExpr
64130import ProjectM36.Notifications
65131import ProjectM36.Server.RemoteCallTypes
132+import qualified ProjectM36.DisconnectedTransaction as Discon
66133import ProjectM36.Relation (typesAsRelation)
67−import ProjectM36.AtomFunctionBody (initScriptSession, ScriptSession)
134+import ProjectM36.ScriptSession (initScriptSession, ScriptSession)
68135import qualified ProjectM36.Relation as R
69−import Network.Transport.TCP (createTransport, defaultTCPParameters, encodeEndPointAddress)
70−import Control.Distributed.Process.Node (newLocalNode, initRemoteTable, runProcess, LocalNode, forkProcess)
71−import Control.Distributed.Process.Extras.Internal.Types (whereisRemote)
72−import Control.Distributed.Process.ManagedProcess.Client (call, safeCall)
73−import Control.Distributed.Process (NodeId(..))
136+import Control.Exception.Base
137+import Control.Concurrent.STM
138+import Control.Concurrent.Async
74139
140+import Data.Either (isRight)
75141import Data.UUID.V4 (nextRandom)
76−import Control.Concurrent.STM
77142import Data.Word
78−import Control.Distributed.Process (ProcessId, Process, receiveWait, send, match)
79−import Control.Exception (IOException, SomeException(..), handle, AsyncException, throwIO, fromException, Exception)
143+import Data.Hashable
144+import Control.Exception (IOException, handle, AsyncException, throwIO, fromException, Exception)
80145import Control.Concurrent.MVar
146+import Codec.Winery hiding (Schema, schema)
81147import qualified Data.Map as M
82−import Control.Distributed.Process.Serializable (Serializable)
83−--import Control.Distributed.Process.Debug
84−import qualified STMContainers.Map as STMMap
85−import qualified STMContainers.Set as STMSet
148+#if MIN_VERSION_stm_containers(1,0,0)
149+import qualified StmContainers.Map as StmMap
150+import qualified StmContainers.Set as StmSet
151+#else
152+import qualified STMContainers.Map as StmMap
153+import qualified STMContainers.Set as StmSet
154+#endif
155+import qualified ProjectM36.Session as Sess
86156import ProjectM36.Session
87157import ProjectM36.Sessions
88−import ListT
89−import Data.Binary (Binary)
90158import GHC.Generics (Generic)
91159import Control.DeepSeq (force)
92−--import Debug.Trace
160+import System.IO
161+import Data.Time.Clock
162+import qualified Network.RPC.Curryer.Client as RPC
163+import qualified Network.RPC.Curryer.Server as RPC
164+import Network.Socket (Socket, AddrInfo(..), getAddrInfo, defaultHints, AddrInfoFlag(..), SocketType(..), ServiceName, hostAddressToTuple, SockAddr(..))
165+import GHC.Conc (unsafeIOToSTM)
93166
94167type Hostname = String
95168
96169type Port = Word16
97170
98−type DatabaseName = String
99−
100171-- | The type for notifications callbacks in the client. When a registered notification fires due to a changed relational expression evaluation, the server propagates the notifications to the clients in the form of the callback.
101172type NotificationCallback = NotificationName -> EvaluatedNotification -> IO ()
102173
@@ -106,124 +177,152 @@ emptyNotificationCallback _ _ = pure ()
106177
107178type GhcPkgPath = String
108179
109−-- | Construct a 'ConnectionInfo' to describe how to make the 'Connection'.
110−data ConnectionInfo = InProcessConnectionInfo PersistenceStrategy NotificationCallback [GhcPkgPath]|
111− RemoteProcessConnectionInfo DatabaseName NodeId NotificationCallback
180+data RemoteProcessDiedException = RemoteProcessDiedException
181+ deriving (Show, Eq)
182+
183+instance Exception RemoteProcessDiedException
184+
185+data RequestTimeoutException = RequestTimeoutException
186+ deriving (Show, Eq)
187+
188+instance Exception RequestTimeoutException
189+
190+-- | Construct a 'ConnectionInfo' to describe how to make the 'Connection'. The database can be run within the current process or running remotely via RPC.
191+data ConnectionInfo = InProcessConnectionInfo PersistenceStrategy NotificationCallback [GhcPkgPath] |
192+ RemoteConnectionInfo DatabaseName Hostname ServiceName NotificationCallback
112193
113194type EvaluatedNotifications = M.Map NotificationName EvaluatedNotification
114195
115196-- | Used for callbacks from the server when monitored changes have been made.
116−data NotificationMessage = NotificationMessage EvaluatedNotifications
117− deriving (Binary, Eq, Show, Generic)
197+newtype NotificationMessage = NotificationMessage EvaluatedNotifications
198+ deriving (Eq, Show, Generic)
199+ deriving Serialise via WineryVariant NotificationMessage
118200
119−-- | When a notification is fired, the 'reportExpr' is evaluated in the commit's context, so that is returned along with the original notification.
201+-- | When a notification is fired, the 'reportOldExpr' is evaluated in the commit's pre-change context while the 'reportNewExpr' is evaluated in the post-change context and they are returned along with the original notification.
120202data EvaluatedNotification = EvaluatedNotification {
121203 notification :: Notification,
122− reportRelation :: Either RelationalError Relation
204+ reportOldRelation :: Either RelationalError Relation,
205+ reportNewRelation :: Either RelationalError Relation
123206 }
124− deriving(Binary, Eq, Show, Generic)
125−
126−createNodeId :: Hostname -> Port -> NodeId
127−createNodeId host port = NodeId $ encodeEndPointAddress host (show port) 0
207+ deriving (Eq, Show, Generic)
208+ deriving Serialise via WineryRecord EvaluatedNotification
128209
210+
211+-- | Use this for connecting to remote servers on the default port.
129212defaultServerPort :: Port
130213defaultServerPort = 6543
131214
215+-- | Use this for connecting to remote servers with the default database name.
132216defaultDatabaseName :: DatabaseName
133217defaultDatabaseName = "base"
134218
219+-- | Use this for connecting to remote servers with the default head name.
135220defaultHeadName :: HeadName
136221defaultHeadName = "master"
137222
223+-- | Create a connection configuration which connects to the localhost on the default server port and default server database name. The configured notification callback is set to ignore all events.
138224defaultRemoteConnectionInfo :: ConnectionInfo
139−defaultRemoteConnectionInfo = RemoteProcessConnectionInfo defaultDatabaseName (createNodeId "127.0.0.1" defaultServerPort) emptyNotificationCallback
225+defaultRemoteConnectionInfo =
226+ RemoteConnectionInfo defaultDatabaseName defaultServerHostname (show defaultServerPort) emptyNotificationCallback
140227
141−-- | The 'Connection' represents either local or remote access to a database. All operations flow through the connection.
142−type ClientNodes = STMSet.Set ProcessId
228+defaultServerHostname :: Hostname
229+defaultServerHostname = "localhost"
143230
144−data Connection = InProcessConnection PersistenceStrategy ClientNodes Sessions (TVar TransactionGraph) ScriptSession |
145− RemoteProcessConnection LocalNode ProcessId
231+newtype RemoteConnectionConf = RemoteConnectionConf RPC.Connection
232+
233+data Connection = InProcessConnection InProcessConnectionConf |
234+ RemoteConnection RemoteConnectionConf
146235
147236-- | There are several reasons why a connection can fail.
148237data ConnectionError = SetupDatabaseDirectoryError PersistenceError |
149238 IOExceptionError IOException |
150239 NoSuchDatabaseByNameError DatabaseName |
240+ DatabaseValidationError [MerkleValidationError] |
151241 LoginError
152242 deriving (Show, Eq, Generic)
153243
154244remoteDBLookupName :: DatabaseName -> String
155245remoteDBLookupName = (++) "db-"
156246
157−commonLocalNode :: IO (Either ConnectionError LocalNode)
158−commonLocalNode = do
159− eLocalTransport <- createTransport "127.0.0.1" "0" defaultTCPParameters
160− case eLocalTransport of
161− Left err -> pure (Left $ IOExceptionError err)
162− Right localTransport -> newLocalNode localTransport initRemoteTable >>= pure . Right
163−
164−notificationListener :: NotificationCallback -> Process ()
165−notificationListener callback = do
166− --pid <- getSelfPid
167− --liftIO $ putStrLn $ "LISTENER THREAD START " ++ show pid
168− _ <- forever $ do
169− receiveWait [
170− match (\(NotificationMessage eNots) -> do
171− --say $ "NOTIFICATION: " ++ show eNots
172− liftIO $ mapM_ (uncurry callback) (M.toList eNots)
173− )
174− ]
175− --say "LISTENER THREAD EXIT"
176− pure ()
177−
178−startNotificationListener :: NotificationCallback -> IO (ProcessId)
179−startNotificationListener callback = do
180− eLocalNode <- commonLocalNode
181− case eLocalNode of
182− Left err -> error ("Failed to start local notification listener: " ++ show err)
183− Right localNode -> forkProcess localNode (notificationListener callback)
184−
185−-- | To create a 'Connection' to a remote or local database, create a connectionInfo and call 'connectProjectM36'.
247+createScriptSession :: [String] -> IO (Maybe ScriptSession)
248+createScriptSession ghcPkgPaths = do
249+ eScriptSession <- initScriptSession ghcPkgPaths
250+ case eScriptSession of
251+ Left err -> hPutStrLn stderr ("Warning: Haskell scripting disabled: " ++ show err) >> pure Nothing --not a fatal error, but the scripting feature must be disabled
252+ Right s -> pure (Just s)
253+
254+
255+-- | To create a 'Connection' to a remote or local database, create a 'ConnectionInfo' and call 'connectProjectM36'.
186256connectProjectM36 :: ConnectionInfo -> IO (Either ConnectionError Connection)
187257--create a new in-memory database/transaction graph
188258connectProjectM36 (InProcessConnectionInfo strat notificationCallback ghcPkgPaths) = do
189259 freshId <- nextRandom
260+ tstamp <- getCurrentTime
190261 let bootstrapContext = basicDatabaseContext
191− freshGraph = bootstrapTransactionGraph freshId bootstrapContext
262+ freshGraph = bootstrapTransactionGraph tstamp freshId bootstrapContext
192263 case strat of
193264 --create date examples graph for now- probably should be empty context in the future
194265 NoPersistence -> do
195266 graphTvar <- newTVarIO freshGraph
196− clientNodes <- STMSet.newIO
197− sessions <- STMMap.newIO
198− notificationPid <- startNotificationListener notificationCallback
199− interpreterSession <- initScriptSession ghcPkgPaths
200− let conn = InProcessConnection strat clientNodes sessions graphTvar interpreterSession
201− addClientNode conn notificationPid
267+ clientNodes <- StmSet.newIO
268+ sessions <- StmMap.newIO
269+ mScriptSession <- createScriptSession ghcPkgPaths
270+ notifAsync <- startNotificationListener clientNodes notificationCallback
271+ let conn = InProcessConnection InProcessConnectionConf {
272+ ipPersistenceStrategy = strat,
273+ ipClientNodes = clientNodes,
274+ ipSessions = sessions,
275+ ipTransactionGraph = graphTvar,
276+ ipScriptSession = mScriptSession,
277+ ipLocks = Nothing,
278+ ipCallbackAsync = notifAsync
279+ }
202280 pure (Right conn)
203281 MinimalPersistence dbdir -> connectPersistentProjectM36 strat NoDiskSync dbdir freshGraph notificationCallback ghcPkgPaths
204282 CrashSafePersistence dbdir -> connectPersistentProjectM36 strat FsyncDiskSync dbdir freshGraph notificationCallback ghcPkgPaths
205283
206−connectProjectM36 (RemoteProcessConnectionInfo databaseName serverNodeId notificationCallback) = do
207− connStatus <- newEmptyMVar
208− eLocalNode <- commonLocalNode
209− notificationListenerPid <- startNotificationListener notificationCallback
210− let dbName = remoteDBLookupName databaseName
211− --putStrLn $ show serverNodeId ++ " " ++ dbName
212− case eLocalNode of
213− Left err -> pure (Left err)
214− Right localNode -> do
215− runProcess localNode $ do
216− mServerProcessId <- whereisRemote serverNodeId dbName
217− case mServerProcessId of
218− Nothing -> liftIO $ putMVar connStatus $ Left (NoSuchDatabaseByNameError databaseName)
219− Just serverProcessId -> do
220− loginConfirmation <- call serverProcessId (Login notificationListenerPid)
221− if not loginConfirmation then
222− liftIO $ putMVar connStatus (Left LoginError)
223− else do
224− liftIO $ putMVar connStatus (Right $ RemoteProcessConnection localNode serverProcessId)
225− status <- takeMVar connStatus
226− pure status
284+connectProjectM36 (RemoteConnectionInfo dbName hostName servicePort notificationCallback) = do
285+ --TODO- add notification callback thread
286+ let resolutionHints = defaultHints { addrFlags = [AI_NUMERICHOST, AI_NUMERICSERV],
287+ addrSocketType = Stream
288+ }
289+ resolved <- getAddrInfo (Just resolutionHints) (Just hostName) (Just servicePort)
290+ case resolved of
291+ [] -> error ("DNS resolution failed for" <> hostName <> ":" <> servicePort)
292+ addrInfo:_ -> do
293+ --supports IPv4 only for now
294+ let (SockAddrInet port addr) = addrAddress addrInfo
295+ notificationHandlers =
296+ [RPC.ClientAsyncRequestHandler $
297+ \(NotificationMessage notifications') ->
298+ forM_ (M.toList notifications') (uncurry notificationCallback)
299+ ]
300+ let connectExcHandler (e :: IOException) = pure $ Left (IOExceptionError e)
301+ eConn <- (Right <$> RPC.connect notificationHandlers (hostAddressToTuple addr) port) `catch` connectExcHandler
302+ case eConn of
303+ Left err -> pure (Left err)
304+ Right conn -> do
305+ eRet <- RPC.call conn (Login dbName)
306+ case eRet of
307+ Left err -> error (show err)
308+ Right False -> error "wtf"
309+ Right True ->
310+ --TODO handle connection errors!
311+ pure (Right (RemoteConnection (RemoteConnectionConf conn)))
312+
313+--convert RPC errors into exceptions
314+convertRPCErrors :: RPC.ConnectionError -> IO a
315+convertRPCErrors err =
316+ case err of
317+ RPC.TimeoutError -> throw RequestTimeoutException
318+ RPC.CodecError msg -> error $ "decoding message failed on server: " <> msg
319+ RPC.ExceptionError msg -> error $ "server threw exception: " <> msg
320+
321+addClientNode :: Connection -> RPC.Locking Socket -> IO ()
322+addClientNode (RemoteConnection _) _ = error "addClientNode called on remote connection"
323+addClientNode (InProcessConnection conf) lockSock = atomically (StmSet.insert clientInfo (ipClientNodes conf))
324+ where
325+ clientInfo = RemoteClientInfo lockSock
227326
228327connectPersistentProjectM36 :: PersistenceStrategy ->
229328 DiskSync ->
@@ -235,344 +334,762 @@ connectPersistentProjectM36 :: PersistenceStrategy ->
235334connectPersistentProjectM36 strat sync dbdir freshGraph notificationCallback ghcPkgPaths = do
236335 err <- setupDatabaseDir sync dbdir freshGraph
237336 case err of
238− Just err' -> return $ Left (SetupDatabaseDirectoryError err')
239− Nothing -> do
240− graph <- transactionGraphLoad dbdir emptyTransactionGraph
337+ Left err' -> return $ Left (SetupDatabaseDirectoryError err')
338+ Right (lockFileH, digest) -> do
339+ mScriptSession <- createScriptSession ghcPkgPaths
340+ graph <- transactionGraphLoad dbdir emptyTransactionGraph mScriptSession
241341 case graph of
242342 Left err' -> return $ Left (SetupDatabaseDirectoryError err')
243343 Right graph' -> do
244− tvarGraph <- newTVarIO graph'
245− sessions <- STMMap.newIO
246− clientNodes <- STMSet.newIO
247− scriptSession <- initScriptSession ghcPkgPaths
248− let conn = InProcessConnection strat clientNodes sessions tvarGraph scriptSession
249− notificationPid <- startNotificationListener notificationCallback
250− addClientNode conn notificationPid
251− pure (Right conn)
252−
344+ case TG.validateMerkleHashes graph' of
345+ Left merkleErrs -> pure (Left (DatabaseValidationError merkleErrs))
346+ Right _ -> do
347+ tvarGraph <- newTVarIO graph'
348+ sessions <- StmMap.newIO
349+ clientNodes <- StmSet.newIO
350+ lockMVar <- newMVar digest
351+ notifAsync <- startNotificationListener clientNodes notificationCallback
352+ let conn = InProcessConnection InProcessConnectionConf {
353+ ipPersistenceStrategy = strat,
354+ ipClientNodes = clientNodes,
355+ ipSessions = sessions,
356+ ipTransactionGraph = tvarGraph,
357+ ipScriptSession = mScriptSession,
358+ ipLocks = Just (lockFileH, lockMVar),
359+ ipCallbackAsync = notifAsync
360+ }
361+ pure (Right conn)
362+
363+--startup local async process to handle notification callbacks
364+startNotificationListener :: ClientNodes -> NotificationCallback -> IO (Async ())
365+startNotificationListener cNodes notificationCallback = do
366+ inProcessClientInfo@(InProcessClientInfo notifMVar) <- InProcessClientInfo <$> newEmptyMVar
367+ atomically $ StmSet.insert inProcessClientInfo cNodes
368+ async $ forever $ do
369+ notifs <- takeMVar notifMVar
370+ forM_ (M.toList notifs) $ uncurry notificationCallback
371+
253372-- | Create a new session at the transaction id and return the session's Id.
254−createSessionAtCommit :: TransactionId -> Connection -> IO (Either RelationalError SessionId)
255−createSessionAtCommit commitId conn@(InProcessConnection _ _ _ _ _) = do
373+createSessionAtCommit :: Connection -> TransactionId -> IO (Either RelationalError SessionId)
374+createSessionAtCommit conn@(InProcessConnection _) commitId = do
256375 newSessionId <- nextRandom
257− atomically $ do
258− createSessionAtCommit_ commitId newSessionId conn
259−createSessionAtCommit uuid conn@(RemoteProcessConnection _ _) = remoteCall conn (CreateSessionAtCommit uuid)
376+ atomically $ createSessionAtCommit_ commitId newSessionId conn
377+createSessionAtCommit conn@(RemoteConnection _) uuid = remoteCall conn (CreateSessionAtCommit uuid)
260378
261379createSessionAtCommit_ :: TransactionId -> SessionId -> Connection -> STM (Either RelationalError SessionId)
262−createSessionAtCommit_ commitId newSessionId (InProcessConnection _ _ sessions graphTvar _) = do
380+createSessionAtCommit_ commitId newSessionId (InProcessConnection conf) = do
381+ let sessions = ipSessions conf
382+ graphTvar = ipTransactionGraph conf
263383 graph <- readTVar graphTvar
264− case transactionForId commitId graph of
384+ case RE.transactionForId commitId graph of
265385 Left err -> pure (Left err)
266386 Right transaction -> do
267− let freshDiscon = DisconnectedTransaction commitId (transactionContext transaction)
268− keyDuplication <- STMMap.lookup newSessionId sessions
387+ let freshDiscon = DisconnectedTransaction commitId (Trans.schemas transaction) False
388+ keyDuplication <- StmMap.lookup newSessionId sessions
269389 case keyDuplication of
270390 Just _ -> pure $ Left (SessionIdInUseError newSessionId)
271391 Nothing -> do
272− STMMap.insert (Session freshDiscon) newSessionId sessions
392+ StmMap.insert (Session freshDiscon defaultSchemaName) newSessionId sessions
273393 pure $ Right newSessionId
274−createSessionAtCommit_ _ _ (RemoteProcessConnection _ _) = error "createSessionAtCommit_ called on remote connection"
394+createSessionAtCommit_ _ _ (RemoteConnection _) = error "createSessionAtCommit_ called on remote connection"
275395
276396-- | Call 'createSessionAtHead' with a transaction graph's head's name to create a new session pinned to that head. This function returns a 'SessionId' which can be used in other function calls to reference the point in the transaction graph.
277−createSessionAtHead :: HeadName -> Connection -> IO (Either RelationalError SessionId)
278−createSessionAtHead headn conn@(InProcessConnection _ _ _ graphTvar _) = do
397+createSessionAtHead :: Connection -> HeadName -> IO (Either RelationalError SessionId)
398+createSessionAtHead conn@(InProcessConnection conf) headn = do
399+ let graphTvar = ipTransactionGraph conf
279400 newSessionId <- nextRandom
280401 atomically $ do
281402 graph <- readTVar graphTvar
282403 case transactionForHead headn graph of
283404 Nothing -> pure $ Left (NoSuchHeadNameError headn)
284405 Just trans -> createSessionAtCommit_ (transactionId trans) newSessionId conn
285−createSessionAtHead headn conn@(RemoteProcessConnection _ _) = remoteCall conn (CreateSessionAtHead headn)
286−
287−-- | Used internally for server connections to keep track of remote nodes for the purpose of sending notifications later.
288−addClientNode :: Connection -> ProcessId -> IO ()
289−addClientNode (RemoteProcessConnection _ _) _ = error "addClientNode called on remote connection"
290−addClientNode (InProcessConnection _ clientNodes _ _ _) newProcessId = atomically (STMSet.insert newProcessId clientNodes)
406+createSessionAtHead conn@(RemoteConnection _) headn = remoteCall conn (CreateSessionAtHead headn)
291407
292408-- | Discards a session, eliminating any uncommitted changes present in the session.
293409closeSession :: SessionId -> Connection -> IO ()
294−closeSession sessionId (InProcessConnection _ _ sessions _ _) = do
295− atomically $ STMMap.delete sessionId sessions
296−closeSession sessionId conn@(RemoteProcessConnection _ _) = remoteCall conn (CloseSession sessionId)
297−-- | 'close' cleans up the database access connection. Note that sessions persist even after the connection is closed.
410+closeSession sessionId (InProcessConnection conf) =
411+ atomically $ StmMap.delete sessionId (ipSessions conf)
412+closeSession sessionId conn@(RemoteConnection _) = remoteCall conn (CloseSession sessionId)
413+
414+-- | 'close' cleans up the database access connection and closes any relevant sockets.
298415close :: Connection -> IO ()
299−close (InProcessConnection _ _ sessions _ _) = atomically $ do
300− traverse_ (\(k,_) -> STMMap.delete k sessions) (STMMap.stream sessions)
416+close (InProcessConnection conf) = do
417+ cancel (ipCallbackAsync conf)
418+ atomically $ do
419+ let sessions = ipSessions conf
420+#if MIN_VERSION_stm_containers(1,0,0)
421+ StmMap.reset sessions
422+#else
423+ StmMap.deleteAll sessions
424+#endif
301425 pure ()
426+ let mLocks = ipLocks conf
427+ case mLocks of
428+ Nothing -> pure ()
429+ Just (lockFileH, _) -> closeLockFile lockFileH
302430
303−close (RemoteProcessConnection localNode serverProcessId) = do
304− runProcessResult localNode $ do
305− call serverProcessId Logout
306−
431+close (RemoteConnection (RemoteConnectionConf conn)) =
432+ RPC.close conn
433+
434+--used only by the server EntryPoints
435+closeRemote_ :: Connection -> IO ()
436+closeRemote_ (InProcessConnection _) = error "invalid call of closeRemote_ on InProcessConnection"
437+closeRemote_ (RemoteConnection (RemoteConnectionConf conn)) = RPC.close conn
438+
439+ --we need to actually close the localNode's connection to the remote
307440--within the database server, we must catch and handle all exception lest they take down the database process- this handling might be different for other use-cases
308441--exceptions should generally *NOT* be thrown from any Project:M36 code paths, but third-party code such as AtomFunction scripts could conceivably throw undefined, etc.
309442
310−excMaybe :: IO (Maybe RelationalError) -> IO (Maybe RelationalError)
311−excMaybe m = handle handler m
312− where
313− handler exc | Just (_ :: AsyncException) <- fromException exc = throwIO exc
314− | otherwise = pure (Just (UnhandledExceptionError (show exc)))
315−
316443excEither :: IO (Either RelationalError a) -> IO (Either RelationalError a)
317−excEither m = handle handler m
444+excEither = handle handler
318445 where
319446 handler exc | Just (_ :: AsyncException) <- fromException exc = throwIO exc
320447 | otherwise = pure (Left (UnhandledExceptionError (show exc)))
321−
322−runProcessResult :: LocalNode -> Process a -> IO a
323−runProcessResult localNode proc = do
324− ret <- newEmptyMVar
325− runProcess localNode $ do
326− val <- proc
327− liftIO $ putMVar ret val
328− takeMVar ret
329−
330−remoteCall :: (Serializable a, Serializable b) => Connection -> a -> IO b
331−remoteCall (InProcessConnection _ _ _ _ _) _ = error "remoteCall called on local connection"
332−remoteCall (RemoteProcessConnection localNode serverProcessId) arg = runProcessResult localNode $ do
333− ret <- safeCall serverProcessId arg
334− case ret of
335− Left err -> error (show err)
336− Right ret' -> pure ret'
448+
449+
450+remoteCall :: (Serialise a, Serialise b) => Connection -> a -> IO b
451+remoteCall (InProcessConnection _ ) _ = error "remoteCall called on local connection"
452+remoteCall (RemoteConnection (RemoteConnectionConf rpcConn)) arg = do
453+ eRet <- RPC.call rpcConn arg
454+ case eRet of
455+ Left err -> convertRPCErrors err
456+ Right val -> pure val
337457
338458sessionForSessionId :: SessionId -> Sessions -> STM (Either RelationalError Session)
339−sessionForSessionId sessionId sessions = do
340− maybeSession <- STMMap.lookup sessionId sessions
341− pure $ maybe (Left $ NoSuchSessionError sessionId) Right maybeSession
459+sessionForSessionId sessionId sessions =
460+ maybe (Left $ NoSuchSessionError sessionId) Right <$> StmMap.lookup sessionId sessions
461+
462+schemaForSessionId :: Session -> STM (Either RelationalError Schema)
463+schemaForSessionId session = do
464+ let sname = schemaName session
465+ if sname == defaultSchemaName then
466+ pure (Right (Schema [])) -- the main schema includes no transformations (but neither do empty schemas :/ )
467+ else
468+ case M.lookup sname (subschemas session) of
469+ Nothing -> pure (Left (SubschemaNameNotInUseError sname))
470+ Just schema -> pure (Right schema)
471+
472+sessionAndSchema :: SessionId -> Sessions -> STM (Either RelationalError (Session, Schema))
473+sessionAndSchema sessionId sessions = do
474+ eSession <- sessionForSessionId sessionId sessions
475+ case eSession of
476+ Left err -> pure (Left err)
477+ Right session -> do
478+ eSchema <- schemaForSessionId session
479+ case eSchema of
480+ Left err -> pure (Left err)
481+ Right schema -> pure (Right (session, schema))
482+
483+-- | Returns the name of the currently selected isomorphic schema.
484+currentSchemaName :: SessionId -> Connection -> IO (Either RelationalError SchemaName)
485+currentSchemaName sessionId (InProcessConnection conf) = atomically $ do
486+ let sessions = ipSessions conf
487+ eSession <- sessionForSessionId sessionId sessions
488+ case eSession of
489+ Left err -> pure (Left err)
490+ Right session -> pure (Right (Sess.schemaName session))
491+currentSchemaName sessionId conn@(RemoteConnection _) = remoteCall conn (RetrieveCurrentSchemaName sessionId)
492+
493+-- | Switch to the named isomorphic schema.
494+setCurrentSchemaName :: SessionId -> Connection -> SchemaName -> IO (Either RelationalError ())
495+setCurrentSchemaName sessionId (InProcessConnection conf) sname = atomically $ do
496+ let sessions = ipSessions conf
497+ eSession <- sessionForSessionId sessionId sessions
498+ case eSession of
499+ Left err -> pure (Left err)
500+ Right session -> case Sess.setSchemaName sname session of
501+ Left err -> pure (Left err)
502+ Right newSession -> StmMap.insert newSession sessionId sessions >> pure (Right ())
503+setCurrentSchemaName sessionId conn@(RemoteConnection _) sname = remoteCall conn (ExecuteSetCurrentSchema sessionId sname)
342504
343505-- | Execute a relational expression in the context of the session and connection. Relational expressions are queries and therefore cannot alter the database.
344506executeRelationalExpr :: SessionId -> Connection -> RelationalExpr -> IO (Either RelationalError Relation)
345−executeRelationalExpr sessionId (InProcessConnection _ _ sessions _ _) expr = excEither $ atomically $ do
346− eSession <- sessionForSessionId sessionId sessions
507+executeRelationalExpr sessionId (InProcessConnection conf) expr = excEither $ atomically $ do
508+ let sessions = ipSessions conf
509+ eSession <- sessionAndSchema sessionId sessions
347510 case eSession of
348511 Left err -> pure $ Left err
349− Right (Session (DisconnectedTransaction _ context)) -> case evalState (RE.evalRelationalExpr expr) context of
350− Left err -> pure (Left err)
351− Right rel -> pure (force (Right rel)) -- this is necessary so that any undefined/error exceptions are spit out here
352−executeRelationalExpr sessionId conn@(RemoteProcessConnection _ _) relExpr = remoteCall conn (ExecuteRelationalExpr sessionId relExpr)
353−
512+ Right (session, schema) -> do
513+ let expr' = if schemaName session /= defaultSchemaName then
514+ Schema.processRelationalExprInSchema schema expr
515+ else
516+ Right expr
517+ case expr' of
518+ Left err -> pure (Left err)
519+ Right expr'' -> do
520+ let graphTvar = ipTransactionGraph conf
521+ graph <- readTVar graphTvar
522+ let reEnv = RE.mkRelationalExprEnv (Sess.concreteDatabaseContext session) graph
523+ case optimizeAndEvalRelationalExpr reEnv expr'' of
524+ Right rel -> pure (force (Right rel)) -- this is necessary so that any undefined/error exceptions are spit out here
525+ Left err -> pure (Left err)
526+
527+executeRelationalExpr sessionId conn@(RemoteConnection _) relExpr = remoteCall conn (ExecuteRelationalExpr sessionId relExpr)
528+
354529-- | Execute a database context expression in the context of the session and connection. Database expressions modify the current session's disconnected transaction but cannot modify the transaction graph.
355−executeDatabaseContextExpr :: SessionId -> Connection -> DatabaseContextExpr -> IO (Maybe RelationalError)
356−executeDatabaseContextExpr sessionId (InProcessConnection _ _ sessions _ _) expr = excMaybe $ atomically $ do
357− eSession <- sessionForSessionId sessionId sessions
530+executeDatabaseContextExpr :: SessionId -> Connection -> DatabaseContextExpr -> IO (Either RelationalError ())
531+executeDatabaseContextExpr sessionId (InProcessConnection conf) expr = excEither $ atomically $ do
532+ let sessions = ipSessions conf
533+ eSession <- sessionAndSchema sessionId sessions
358534 case eSession of
359− Left err -> pure $ Just err
360− Right session -> do
361− case runState (RE.evalContextExpr expr) (sessionContext session) of
362− (Just err,_) -> return $ Just err
363− (Nothing, context') -> do
364− let newDiscon = DisconnectedTransaction (sessionParentId session) context'
365− newSession = Session newDiscon
366− STMMap.insert newSession sessionId sessions
367− pure Nothing
368−
369−executeDatabaseContextExpr sessionId conn@(RemoteProcessConnection _ _) dbExpr = remoteCall conn (ExecuteDatabaseContextExpr sessionId dbExpr)
535+ Left err -> pure (Left err)
536+ Right (session, schema) -> do
537+ let expr' = if schemaName session == defaultSchemaName then
538+ Right expr
539+ else
540+ Schema.processDatabaseContextExprInSchema schema expr
541+ case expr' of
542+ Left err -> pure (Left err)
543+ Right expr'' -> do
544+ graph <- readTVar (ipTransactionGraph conf)
545+ let ctx = Sess.concreteDatabaseContext session
546+ env = RE.mkDatabaseContextEvalEnv transId graph
547+ transId = Sess.parentId session
548+ case RE.runDatabaseContextEvalMonad ctx env (optimizeAndEvalDatabaseContextExpr True expr'') of
549+ Left err -> pure (Left err)
550+ Right newState ->
551+ if not (RE.dbc_dirty newState) then --nothing dirtied, nothing to do
552+ pure (Right ())
553+ else do
554+ let newDiscon = DisconnectedTransaction (Sess.parentId session) newSchemas True
555+ context' = RE.dbc_context newState
556+ newSubschemas = Schema.processDatabaseContextExprSchemasUpdate (Sess.subschemas session) expr
557+ newSchemas = Schemas context' newSubschemas
558+ newSession = Session newDiscon (Sess.schemaName session)
559+ StmMap.insert newSession sessionId sessions
560+ pure (Right ())
561+executeDatabaseContextExpr sessionId conn@(RemoteConnection _) dbExpr = remoteCall conn (ExecuteDatabaseContextExpr sessionId dbExpr)
370562
371−-- | Execute a database context IO-monad-based expression for the given session and connection. `DatabaseContextIOExpr` modify the DatabaseContext but cannot be purely implemented.
563+-- | Similar to a git rebase, 'autoMergeToHead' atomically creates a temporary branch and merges it to the latest commit of the branch referred to by the 'HeadName' and commits the merge. This is useful to reduce incidents of 'TransactionIsNotAHeadError's but at the risk of merge errors (thus making it similar to rebasing). Alternatively, as an optimization, if a simple commit is possible (meaning that the head has not changed), then a fast-forward commit takes place instead.
564+autoMergeToHead :: SessionId -> Connection -> MergeStrategy -> HeadName -> IO (Either RelationalError ())
565+autoMergeToHead sessionId (InProcessConnection conf) strat headName' = do
566+ let sessions = ipSessions conf
567+ id1 <- nextRandom
568+ id2 <- nextRandom
569+ id3 <- nextRandom
570+ tstamp <- getCurrentTime
571+ commitLock_ sessionId conf $ \graph -> do
572+ eSession <- sessionForSessionId sessionId sessions
573+ case eSession of
574+ Left err -> pure (Left err)
575+ Right session ->
576+ case Graph.transactionForHead headName' graph of
577+ Nothing -> pure (Left (NoSuchHeadNameError headName'))
578+ Just headTrans -> do
579+ --attempt fast-forward commit, if possible
580+ let graphInfo = if Sess.parentId session == transactionId headTrans then do
581+ ret <- Graph.evalGraphOp tstamp id1 (Sess.disconnectedTransaction session) graph Commit
582+ pure (ret, [id1])
583+ else do
584+ ret <- Graph.autoMergeToHead tstamp (id1, id2, id3) (Sess.disconnectedTransaction session) headName' strat graph
585+ pure (ret, [id1,id2,id3])
586+ case graphInfo of
587+ Left err -> pure (Left err)
588+ Right ((discon', graph'), transactionIdsAdded) ->
589+ pure (Right (discon', graph', transactionIdsAdded))
590+autoMergeToHead sessionId conn@(RemoteConnection _) strat headName' = remoteCall conn (ExecuteAutoMergeToHead sessionId strat headName')
591+
592+-- | Execute a database context IO-monad-based expression for the given session and connection. `DatabaseContextIOExpr`s modify the DatabaseContext but cannot be purely implemented.
372593--this is almost completely identical to executeDatabaseContextExpr above
373−executeDatabaseContextIOExpr :: SessionId -> Connection -> DatabaseContextIOExpr -> IO (Maybe RelationalError)
374−executeDatabaseContextIOExpr sessionId (InProcessConnection _ _ sessions _ scriptSession) expr = excMaybe $ do
594+executeDatabaseContextIOExpr :: SessionId -> Connection -> DatabaseContextIOExpr -> IO (Either RelationalError ())
595+executeDatabaseContextIOExpr sessionId (InProcessConnection conf) expr = excEither $ do
596+ let sessions = ipSessions conf
597+ scriptSession = ipScriptSession conf
375598 eSession <- atomically $ sessionForSessionId sessionId sessions --potentially race condition due to interleaved IO?
376599 case eSession of
377− Left err -> pure $ Just err
600+ Left err -> pure (Left err)
378601 Right session -> do
379− res <- RE.evalDatabaseContextIOExpr scriptSession (sessionContext session) expr
602+ graph <- readTVarIO (ipTransactionGraph conf)
603+ let env = RE.DatabaseContextIOEvalEnv transId graph scriptSession
604+ transId = Sess.parentId session
605+ context = Sess.concreteDatabaseContext session
606+ res <- RE.runDatabaseContextIOEvalMonad env context (optimizeAndEvalDatabaseContextIOExpr expr)
380607 case res of
381− Left err -> pure (Just err)
382− Right context' -> do
383− let newDiscon = DisconnectedTransaction (sessionParentId session) context'
384− newSession = Session newDiscon
385− atomically $ STMMap.insert newSession sessionId sessions
386− pure Nothing
387−executeDatabaseContextIOExpr sessionId conn@(RemoteProcessConnection _ _) dbExpr = remoteCall conn (ExecuteDatabaseContextIOExpr sessionId dbExpr)
608+ Left err -> pure (Left err)
609+ Right newState -> do
610+ let newDiscon = DisconnectedTransaction (Sess.parentId session) newSchemas False
611+ newSchemas = Schemas context' (Sess.subschemas session)
612+ newSession = Session newDiscon (Sess.schemaName session)
613+ context' = RE.dbc_context newState
614+ atomically $ StmMap.insert newSession sessionId sessions
615+ pure (Right ())
616+executeDatabaseContextIOExpr sessionId conn@(RemoteConnection _) dbExpr = remoteCall conn (ExecuteDatabaseContextIOExpr sessionId dbExpr)
388617
389−executeGraphExprSTM_ :: TransactionId -> SessionId -> Sessions -> TransactionGraphOperator -> TVar TransactionGraph -> STM (Either RelationalError TransactionGraph)
390−executeGraphExprSTM_ freshId sessionId sessions graphExpr graphTvar = do
391− graph <- readTVar graphTvar
392− eSession <- sessionForSessionId sessionId sessions
393− case eSession of
394− Left err -> pure $ Left err
395− Right (Session discon) -> case evalGraphOp freshId discon graph graphExpr of
396− Left err -> pure $ Left err
397− Right (discon', graph') -> do
398− writeTVar graphTvar graph'
399− let newSession = Session discon'
400− STMMap.insert newSession sessionId sessions
401− pure $ Right graph'
402−
403618-- process notifications for commits
404−executeCommitExprSTM_ :: DatabaseContext -> DatabaseContext -> ClientNodes -> STM (EvaluatedNotifications, ClientNodes)
405−executeCommitExprSTM_ oldContext newContext nodes = do
619+executeCommitExprSTM_
620+ :: TransactionGraph
621+ -> DatabaseContext
622+ -> DatabaseContext
623+ -> ClientNodes
624+ -> STM (EvaluatedNotifications, ClientNodes)
625+executeCommitExprSTM_ graph oldContext newContext nodes = do
406626 let nots = notifications oldContext
407− fireNots = notificationChanges nots oldContext newContext
627+ fireNots = notificationChanges nots graph oldContext newContext
408628 evaldNots = M.map mkEvaldNot fireNots
409− mkEvaldNot notif = EvaluatedNotification { notification = notif, reportRelation = evalState (RE.evalRelationalExpr (reportExpr notif)) oldContext }
629+ evalInContext expr ctx = optimizeAndEvalRelationalExpr (RE.mkRelationalExprEnv ctx graph) expr
630+
631+ mkEvaldNot notif = EvaluatedNotification { notification = notif,
632+ reportOldRelation = evalInContext (reportOldExpr notif) oldContext,
633+ reportNewRelation = evalInContext (reportNewExpr notif) newContext}
410634 pure (evaldNots, nodes)
411−
412−
635+
413636-- | Execute a transaction graph expression in the context of the session and connection. Transaction graph operators modify the transaction graph state.
414−executeGraphExpr :: SessionId -> Connection -> TransactionGraphOperator -> IO (Maybe RelationalError)
415−executeGraphExpr sessionId (InProcessConnection strat clientNodes sessions graphTvar _) graphExpr = excMaybe $ do
637+
638+-- OPTIMIZATION OPPORTUNITY: no locks are required to write new transaction data, only to update the transaction graph id file
639+-- if writing data is re-entrant, we may be able to use unsafeIOtoSTM
640+-- perhaps keep hash of data file instead of checking if our head was updated on every write
641+executeGraphExpr :: SessionId -> Connection -> TransactionGraphOperator -> IO (Either RelationalError ())
642+executeGraphExpr sessionId (InProcessConnection conf) graphExpr = excEither $ do
643+ let sessions = ipSessions conf
416644 freshId <- nextRandom
417− manip <- atomically $ do
645+ tstamp <- getCurrentTime
646+ commitLock_ sessionId conf $ \updatedGraph -> do
418647 eSession <- sessionForSessionId sessionId sessions
419− oldGraph <- readTVar graphTvar
420648 case eSession of
421649 Left err -> pure (Left err)
422− Right (Session (DisconnectedTransaction parentId currentContext)) -> do
423− eGraph <- executeGraphExprSTM_ freshId sessionId sessions graphExpr graphTvar
424− case eGraph of
650+ Right session -> do
651+ let discon = Sess.disconnectedTransaction session
652+ case evalGraphOp tstamp freshId discon updatedGraph graphExpr of
425653 Left err -> pure (Left err)
426− Right newGraph -> do
427− if graphExpr == Commit then
428− case transactionForId parentId oldGraph of
429− Left err -> pure $ Left err
430− Right (Transaction _ _ previousContext) -> do
431− (evaldNots, nodes) <- executeCommitExprSTM_ previousContext currentContext clientNodes
432− nodesToNotify <- toList (STMSet.stream nodes)
433− pure $ Right (evaldNots, nodesToNotify, newGraph)
434− else
435− pure $ Right (M.empty, [], newGraph)
436− case manip of
437− Left err -> return $ Just err
438− Right (notsToFire, nodesToNotify, newGraph) -> do
439− --update filesystem database, if necessary
440− --this should really grab a lock at the beginning of the method to be threadsafe
441− processPersistence strat newGraph
442− sendNotifications nodesToNotify notsToFire
443− return Nothing
444−executeGraphExpr sessionId conn@(RemoteProcessConnection _ _) graphExpr = remoteCall conn (ExecuteGraphExpr sessionId graphExpr)
445−
446−{-
447−commitSTM_ :: UUID -> SessionId -> Sessions -> TVar TransactionGraph -> STM (Maybe RelationalError)
448−commitSTM_ freshUUID sessionId sessions graph = do
449− mErr <- executeGraphExprSTM_ freshUUID sessionId sessions Commit graph
450− pure $ case mErr of
451− Left err -> Just err
452− Right _ -> Nothing
453−-}
654+ Right (discon', graph') -> do
655+ --if freshId appears in the graph, then we need to pass it on
656+ let transIds = [freshId | isRight (RE.transactionForId freshId graph')]
657+ pure (Right (discon', graph', transIds))
454658
455−-- | After modifying a session, 'commit' the transaction to the transaction graph at the head which the session is referencing. This will also trigger checks for any notifications which need to be propagated.
456−commit :: SessionId -> Connection -> IO (Maybe RelationalError)
457−commit sessionId conn@(InProcessConnection _ _ _ _ _) = executeGraphExpr sessionId conn Commit
458−commit sessionId conn@(RemoteProcessConnection _ _) = remoteCall conn (ExecuteGraphExpr sessionId Commit)
459−
460−sendNotifications :: [ProcessId] -> EvaluatedNotifications -> IO ()
461−sendNotifications pids nots = mapM_ sendNots pids
462− where
463− sendNots remoteClientPid = do
464− eLocalNode <- commonLocalNode
465− case eLocalNode of
466− Left err -> error ("Failed to get local node: " ++ show err)
467− Right localNode -> when (not (M.null nots)) $ runProcess localNode $ send remoteClientPid (NotificationMessage nots)
468−
469−-- | Discard any changes made in the current session. This resets the disconnected transaction to reference the original database context of the parent transaction and is a very cheap operation.
470−rollback :: SessionId -> Connection -> IO (Maybe RelationalError)
471−rollback sessionId conn@(InProcessConnection _ _ _ _ _) = executeGraphExpr sessionId conn Rollback
472−rollback sessionId conn@(RemoteProcessConnection _ _) = remoteCall conn (ExecuteGraphExpr sessionId Rollback)
473−
474−processPersistence :: PersistenceStrategy -> TransactionGraph -> IO ()
475−processPersistence NoPersistence _ = return ()
476−processPersistence (MinimalPersistence dbdir) graph = transactionGraphPersist NoDiskSync dbdir graph
477−processPersistence (CrashSafePersistence dbdir) graph = transactionGraphPersist FsyncDiskSync dbdir graph
659+executeGraphExpr sessionId conn@(RemoteConnection _) graphExpr = remoteCall conn (ExecuteGraphExpr sessionId graphExpr)
660+
661+-- | A trans-graph expression is a relational query executed against the entirety of a transaction graph.
662+executeTransGraphRelationalExpr :: SessionId -> Connection -> TransGraphRelationalExpr -> IO (Either RelationalError Relation)
663+executeTransGraphRelationalExpr _ (InProcessConnection conf) tgraphExpr = excEither . atomically $ do
664+ let graphTvar = ipTransactionGraph conf
665+ graph <- readTVar graphTvar
666+ pure $ force $ optimizeAndEvalTransGraphRelationalExpr graph tgraphExpr
667+executeTransGraphRelationalExpr sessionId conn@(RemoteConnection _) tgraphExpr = remoteCall conn (ExecuteTransGraphRelationalExpr sessionId tgraphExpr)
668+
669+-- | Schema expressions manipulate the isomorphic schemas for the current 'DatabaseContext'.
670+executeSchemaExpr :: SessionId -> Connection -> Schema.SchemaExpr -> IO (Either RelationalError ())
671+executeSchemaExpr sessionId (InProcessConnection conf) schemaExpr = atomically $ do
672+ let sessions = ipSessions conf
673+ eSession <- sessionAndSchema sessionId sessions
674+ case eSession of
675+ Left err -> pure (Left err)
676+ Right (session, _) -> do
677+ let subschemas' = subschemas session
678+ transId = Sess.parentId session
679+ context = Sess.concreteDatabaseContext session
680+ graph <- readTVar (ipTransactionGraph conf)
681+ case Schema.evalSchemaExpr schemaExpr context transId graph subschemas' of
682+ Left err -> pure (Left err)
683+ Right (newSubschemas, newContext) -> do
684+ --hm- maybe we should start using lenses
685+ let discon = Sess.disconnectedTransaction session
686+ newSchemas = Schemas newContext newSubschemas
687+ newSession = Session (DisconnectedTransaction (Discon.parentId discon) newSchemas False) (Sess.schemaName session)
688+ StmMap.insert newSession sessionId sessions
689+ pure (Right ())
690+executeSchemaExpr sessionId conn@(RemoteConnection _) schemaExpr = remoteCall conn (ExecuteSchemaExpr sessionId schemaExpr)
691+
692+-- | After modifying a 'DatabaseContext', 'commit' the transaction to the transaction graph at the head which the session is referencing. This will also trigger checks for any notifications which need to be propagated.
693+commit :: SessionId -> Connection -> IO (Either RelationalError ())
694+commit sessionId conn@(InProcessConnection _) = executeGraphExpr sessionId conn Commit
695+commit sessionId conn@(RemoteConnection _) = remoteCall conn (ExecuteGraphExpr sessionId Commit)
696+
697+sendNotifications :: [ClientInfo] -> EvaluatedNotifications -> IO ()
698+sendNotifications clients notifs =
699+ unless (M.null notifs) $ forM_ clients sender
700+ where
701+ sender (RemoteClientInfo sock) = RPC.sendMessage sock (NotificationMessage notifs)
702+ sender (InProcessClientInfo tvar) = putMVar tvar notifs
703+
704+-- | Discard any changes made in the current 'Session' and 'DatabaseContext'. This resets the disconnected transaction to reference the original database context of the parent transaction and is a very cheap operation.
705+rollback :: SessionId -> Connection -> IO (Either RelationalError ())
706+rollback sessionId conn@(InProcessConnection _) = executeGraphExpr sessionId conn Rollback
707+rollback sessionId conn@(RemoteConnection _) = remoteCall conn (ExecuteGraphExpr sessionId Rollback)
708+
709+-- | Write the transaction graph to disk. This function can be used to incrementally write new transactions to disk.
710+processTransactionGraphPersistence :: PersistenceStrategy -> [TransactionId] -> TransactionGraph -> IO ()
711+processTransactionGraphPersistence NoPersistence _ _ = pure ()
712+processTransactionGraphPersistence (MinimalPersistence dbdir) transIds graph = transactionGraphPersist NoDiskSync dbdir transIds graph >> pure ()
713+processTransactionGraphPersistence (CrashSafePersistence dbdir) transIds graph = transactionGraphPersist FsyncDiskSync dbdir transIds graph >> pure ()
714+
715+readGraphTransactionIdDigest :: PersistenceStrategy -> IO LockFileHash
716+readGraphTransactionIdDigest NoPersistence = error "attempt to read digest from transaction log without persistence enabled"
717+readGraphTransactionIdDigest (MinimalPersistence dbdir) = readGraphTransactionIdFileDigest dbdir
718+readGraphTransactionIdDigest (CrashSafePersistence dbdir) = readGraphTransactionIdFileDigest dbdir
478719
479720-- | Return a relation whose type would match that of the relational expression if it were executed. This is useful for checking types and validating a relational expression's types.
480721typeForRelationalExpr :: SessionId -> Connection -> RelationalExpr -> IO (Either RelationalError Relation)
481−typeForRelationalExpr sessionId conn@(InProcessConnection _ _ _ _ _) relExpr = atomically $ typeForRelationalExprSTM sessionId conn relExpr
482−typeForRelationalExpr sessionId conn@(RemoteProcessConnection _ _) relExpr = remoteCall conn (ExecuteTypeForRelationalExpr sessionId relExpr)
722+typeForRelationalExpr sessionId conn@(InProcessConnection _) relExpr = atomically $ typeForRelationalExprSTM sessionId conn relExpr
723+typeForRelationalExpr sessionId conn@(RemoteConnection _) relExpr = remoteCall conn (ExecuteTypeForRelationalExpr sessionId relExpr)
483724
484725typeForRelationalExprSTM :: SessionId -> Connection -> RelationalExpr -> STM (Either RelationalError Relation)
485−typeForRelationalExprSTM sessionId (InProcessConnection _ _ sessions _ _) relExpr = do
486− eSession <- sessionForSessionId sessionId sessions
726+typeForRelationalExprSTM sessionId (InProcessConnection conf) relExpr = do
727+ let sessions = ipSessions conf
728+ eSession <- sessionAndSchema sessionId sessions
487729 case eSession of
488730 Left err -> pure $ Left err
489− Right session -> pure $ evalState (RE.typeForRelationalExpr relExpr) (sessionContext session)
731+ Right (session, schema) -> do
732+ let processed = if schemaName session == defaultSchemaName then
733+ Right relExpr
734+ else
735+ Schema.processRelationalExprInSchema schema relExpr
736+ case processed of
737+ Left err -> pure (Left err)
738+ Right relExpr' -> do
739+ graph <- readTVar (ipTransactionGraph conf)
740+ let reEnv = RE.mkRelationalExprEnv (Sess.concreteDatabaseContext session) graph
741+ pure $ RE.runRelationalExprM reEnv (RE.typeForRelationalExpr relExpr')
490742
491743typeForRelationalExprSTM _ _ _ = error "typeForRelationalExprSTM called on non-local connection"
492744
493745-- | Return a 'Map' of the database's constraints at the context of the session and connection.
494−inclusionDependencies :: SessionId -> Connection -> IO (Either RelationalError (M.Map IncDepName InclusionDependency))
495−inclusionDependencies sessionId (InProcessConnection _ _ sessions _ _) = do
746+inclusionDependencies :: SessionId -> Connection -> IO (Either RelationalError InclusionDependencies)
747+inclusionDependencies sessionId (InProcessConnection conf) = do
748+ let sessions = ipSessions conf
496749 atomically $ do
497− eSession <- sessionForSessionId sessionId sessions
750+ eSession <- sessionAndSchema sessionId sessions
498751 case eSession of
499− Left err -> pure $ Left err
500− Right session -> pure $ Right (B.inclusionDependencies (sessionContext session))
752+ Left err -> pure $ Left err
753+ Right (session, schema) -> do
754+ let context = Sess.concreteDatabaseContext session
755+ if schemaName session == defaultSchemaName then
756+ pure $ Right (B.inclusionDependencies context)
757+ else
758+ pure (Schema.inclusionDependenciesInSchema schema (B.inclusionDependencies context))
501759
502−inclusionDependencies sessionId conn@(RemoteProcessConnection _ _) = remoteCall conn (RetrieveInclusionDependencies sessionId)
760+inclusionDependencies sessionId conn@(RemoteConnection _) = remoteCall conn (RetrieveInclusionDependencies sessionId)
503761
762+typeConstructorMapping :: SessionId -> Connection -> IO (Either RelationalError TypeConstructorMapping)
763+typeConstructorMapping sessionId (InProcessConnection conf) = do
764+ let sessions = ipSessions conf
765+ atomically $ do
766+ eSession <- sessionAndSchema sessionId sessions
767+ case eSession of
768+ Left err -> pure $ Left err
769+ Right (session, _) -> --warning, no schema support for typeconstructors
770+ pure (Right (B.typeConstructorMapping (Sess.concreteDatabaseContext session)))
771+typeConstructorMapping sessionId conn@(RemoteConnection _) = remoteCall conn (RetrieveTypeConstructorMapping sessionId)
772+
504773-- | Return an optimized database expression which is logically equivalent to the input database expression. This function can be used to determine which expression will actually be evaluated.
505−planForDatabaseContextExpr :: SessionId -> Connection -> DatabaseContextExpr -> IO (Either RelationalError DatabaseContextExpr)
506−planForDatabaseContextExpr sessionId (InProcessConnection _ _ sessions _ _) dbExpr = do
774+planForDatabaseContextExpr :: SessionId -> Connection -> DatabaseContextExpr -> IO (Either RelationalError GraphRefDatabaseContextExpr)
775+planForDatabaseContextExpr sessionId (InProcessConnection conf) dbExpr = do
776+ let sessions = ipSessions conf
507777 atomically $ do
508− eSession <- sessionForSessionId sessionId sessions
778+ graph <- readTVar (ipTransactionGraph conf)
779+ eSession <- sessionAndSchema sessionId sessions
509780 case eSession of
510− Left err -> pure $ Left err
511− Right session -> pure $ evalState (applyStaticDatabaseOptimization dbExpr) (sessionContext session)
512−planForDatabaseContextExpr sessionId conn@(RemoteProcessConnection _ _) dbExpr = remoteCall conn (RetrievePlanForDatabaseContextExpr sessionId dbExpr)
781+ Left err -> pure $ Left err
782+ Right (session, _) ->
783+ if schemaName session == defaultSchemaName then do
784+ let ctx = Sess.concreteDatabaseContext session
785+ transId = Sess.parentId session
786+ gfExpr = runProcessExprM UncommittedContextMarker (processDatabaseContextExpr dbExpr)
787+ pure $ runGraphRefSOptDatabaseContextExprM transId ctx graph (optimizeGraphRefDatabaseContextExpr gfExpr)
788+ else -- don't show any optimization because the current optimization infrastructure relies on access to the base context- this probably underscores the need for each schema to have its own DatabaseContext, even if it is generated on-the-fly-}
789+ pure (Left NonConcreteSchemaPlanError)
790+
791+planForDatabaseContextExpr sessionId conn@(RemoteConnection _) dbExpr = remoteCall conn (RetrievePlanForDatabaseContextExpr sessionId dbExpr)
513792
514793-- | Return a relation which represents the current state of the global transaction graph. The attributes are
515−-- * current- boolean attribute representing whether or not the current session references this transaction
516−-- * head- text attribute which is a non-empty 'HeadName' iff the transaction references a head.
517−-- * id- id attribute of the transaction
518−-- * parents- a relation-valued attribute which contains a relation of transaction ids which are parent transaction to the transaction
794+-- * current- boolean attribute representing whether or not the current session references this transaction
795+-- * head- text attribute which is a non-empty 'HeadName' iff the transaction references a head.
796+-- * id- id attribute of the transaction
797+-- * parents- a relation-valued attribute which contains a relation of transaction ids which are parent transaction to the transaction
519798transactionGraphAsRelation :: SessionId -> Connection -> IO (Either RelationalError Relation)
520−transactionGraphAsRelation sessionId (InProcessConnection _ _ sessions tvar _) = do
799+transactionGraphAsRelation sessionId (InProcessConnection conf) = do
800+ let sessions = ipSessions conf
801+ tvar = ipTransactionGraph conf
521802 atomically $ do
522803 eSession <- sessionForSessionId sessionId sessions
523804 case eSession of
524805 Left err -> pure $ Left err
525− Right (Session discon) -> do
526− graph <- readTVar tvar
527− pure $ graphAsRelation discon graph
806+ Right session ->
807+ graphAsRelation (Sess.disconnectedTransaction session) <$> readTVar tvar
528808
529−transactionGraphAsRelation sessionId conn@(RemoteProcessConnection _ _) = remoteCall conn (RetrieveTransactionGraph sessionId)
809+transactionGraphAsRelation sessionId conn@(RemoteConnection _) = remoteCall conn (RetrieveTransactionGraph sessionId)
530810
811+-- | Returns the names and types of the relation variables in the current 'Session'.
531812relationVariablesAsRelation :: SessionId -> Connection -> IO (Either RelationalError Relation)
532−relationVariablesAsRelation sessionId (InProcessConnection _ _ sessions _ _) = do
813+relationVariablesAsRelation sessionId (InProcessConnection conf) = do
814+ let sessions = ipSessions conf
533815 atomically $ do
534− eSession <- sessionForSessionId sessionId sessions
816+ graph <- readTVar (ipTransactionGraph conf)
817+ eSession <- sessionAndSchema sessionId sessions
535818 case eSession of
536819 Left err -> pure (Left err)
537− Right (Session (DisconnectedTransaction _ context)) -> pure $ R.relationVariablesAsRelation (relationVariables context)
820+ Right (session, schema) -> do
821+ let context = Sess.concreteDatabaseContext session
822+ if Sess.schemaName session == defaultSchemaName then
823+ pure $ RE.relationVariablesAsRelation context graph
824+ else
825+ case Schema.relationVariablesInSchema schema of
826+ Left err -> pure (Left err)
827+ Right relvars -> do
828+ let schemaContext = context {relationVariables = relvars }
829+ pure $ RE.relationVariablesAsRelation schemaContext graph
538830
539−relationVariablesAsRelation sessionId conn@(RemoteProcessConnection _ _) = remoteCall conn (RetrieveRelationVariableSummary sessionId)
831+relationVariablesAsRelation sessionId conn@(RemoteConnection _) = remoteCall conn (RetrieveRelationVariableSummary sessionId)
832+
833+-- | Returns the names and types of the atom functions in the current 'Session'.
834+atomFunctionsAsRelation :: SessionId -> Connection -> IO (Either RelationalError Relation)
835+atomFunctionsAsRelation sessionId (InProcessConnection conf) = do
836+ let sessions = ipSessions conf
837+ atomically $ do
838+ eSession <- sessionAndSchema sessionId sessions
839+ case eSession of
840+ Left err -> pure (Left err)
841+ Right (session, _) ->
842+ pure (AF.atomFunctionsAsRelation (atomFunctions (concreteDatabaseContext session)))
843+
844+atomFunctionsAsRelation sessionId conn@(RemoteConnection _) = remoteCall conn (RetrieveAtomFunctionSummary sessionId)
845+
846+databaseContextFunctionsAsRelation :: SessionId -> Connection -> IO (Either RelationalError Relation)
847+databaseContextFunctionsAsRelation sessionId (InProcessConnection conf) = do
848+ let sessions = ipSessions conf
849+ atomically $ do
850+ eSession <- sessionAndSchema sessionId sessions
851+ case eSession of
852+ Left err -> pure (Left err)
853+ Right (session, _) ->
854+ pure (DCF.databaseContextFunctionsAsRelation (dbcFunctions (concreteDatabaseContext session)))
855+
856+databaseContextFunctionsAsRelation sessionId conn@(RemoteConnection _) = remoteCall conn (RetrieveDatabaseContextFunctionSummary sessionId)
540857
541858-- | Returns the transaction id for the connection's disconnected transaction committed parent transaction.
542−headTransactionId :: SessionId -> Connection -> IO (Maybe TransactionId)
543−headTransactionId sessionId (InProcessConnection _ _ sessions _ _) = do
859+headTransactionId :: SessionId -> Connection -> IO (Either RelationalError TransactionId)
860+headTransactionId sessionId (InProcessConnection conf) = do
861+ let sessions = ipSessions conf
544862 atomically $ do
545863 eSession <- sessionForSessionId sessionId sessions
546864 case eSession of
547− Left _ -> pure Nothing
548− Right session -> pure $ Just (sessionParentId session)
549−headTransactionId sessionId conn@(RemoteProcessConnection _ _) = remoteCall conn (RetrieveHeadTransactionId sessionId)
865+ Left err -> pure (Left err)
866+ Right session -> pure $ Right (Sess.parentId session)
867+headTransactionId sessionId conn@(RemoteConnection _) = remoteCall conn (RetrieveHeadTransactionId sessionId)
550868
551−headNameSTM_ :: SessionId -> Sessions -> TVar TransactionGraph -> STM (Maybe HeadName)
869+headNameSTM_ :: SessionId -> Sessions -> TVar TransactionGraph -> STM (Either RelationalError HeadName)
552870headNameSTM_ sessionId sessions graphTvar = do
553871 graph <- readTVar graphTvar
554872 eSession <- sessionForSessionId sessionId sessions
555873 case eSession of
556− Left _ -> pure $ Nothing
557− Right session -> pure $ case transactionForId (sessionParentId session) graph of
558− Left _ -> Nothing
559− Right parentTrans -> headNameForTransaction parentTrans graph
874+ Left err -> pure (Left err)
875+ Right session -> case RE.transactionForId (Sess.parentId session) graph of
876+ Left err -> pure (Left err)
877+ Right parentTrans -> case headNameForTransaction parentTrans graph of
878+ Nothing -> pure (Left UnknownHeadError)
879+ Just headName' -> pure (Right headName')
560880
561881-- | Returns Just the name of the head of the current disconnected transaction or Nothing.
562−headName :: SessionId -> Connection -> IO (Maybe HeadName)
563−headName sessionId (InProcessConnection _ _ sessions graphTvar _) = do
882+headName :: SessionId -> Connection -> IO (Either RelationalError HeadName)
883+headName sessionId (InProcessConnection conf) = do
884+ let sessions = ipSessions conf
885+ graphTvar = ipTransactionGraph conf
564886 atomically (headNameSTM_ sessionId sessions graphTvar)
565−headName sessionId conn@(RemoteProcessConnection _ _) = remoteCall conn (ExecuteHeadName sessionId)
887+headName sessionId conn@(RemoteConnection _) = remoteCall conn (ExecuteHeadName sessionId)
566888
889+-- | Returns a listing of all available atom types.
567890atomTypesAsRelation :: SessionId -> Connection -> IO (Either RelationalError Relation)
568−atomTypesAsRelation sessionId (InProcessConnection _ _ sessions _ _) = do
891+atomTypesAsRelation sessionId (InProcessConnection conf) = do
892+ let sessions = ipSessions conf
569893 atomically $ do
570894 eSession <- sessionForSessionId sessionId sessions
571895 case eSession of
572896 Left err -> pure (Left err)
573− Right (Session (DisconnectedTransaction _ context)) -> do
574− case typesAsRelation (typeConstructorMapping context) of
897+ Right session ->
898+ case typesAsRelation (B.typeConstructorMapping (Sess.concreteDatabaseContext session)) of
575899 Left err -> pure (Left err)
576900 Right rel -> pure (Right rel)
577−atomTypesAsRelation sessionId conn@(RemoteProcessConnection _ _) = remoteCall conn (RetrieveAtomTypesAsRelation sessionId)
901+atomTypesAsRelation sessionId conn@(RemoteConnection _) = remoteCall conn (RetrieveAtomTypesAsRelation sessionId)
902+
903+disconnectedTransactionIsDirty :: SessionId -> Connection -> IO (Either RelationalError Bool)
904+disconnectedTransactionIsDirty sessionId (InProcessConnection conf) = do
905+ let sessions = ipSessions conf
906+ atomically $ do
907+ eSession <- sessionForSessionId sessionId sessions
908+ case eSession of
909+ Left err -> pure (Left err)
910+ Right session ->
911+ pure (Right (isDirty session))
912+disconnectedTransactionIsDirty sessionId conn@(RemoteConnection _) = remoteCall conn (RetrieveSessionIsDirty sessionId)
578913
914+--used only for testing- we expect this to throw an exception
915+callTestTimeout_ :: SessionId -> Connection -> IO Bool
916+callTestTimeout_ _ (InProcessConnection _) = error "bad testing call"
917+callTestTimeout_ sessionId conn@(RemoteConnection _) = remoteCall conn (TestTimeout sessionId)
918+
919+--used in tests only
920+transactionGraph_ :: Connection -> IO TransactionGraph
921+transactionGraph_ (InProcessConnection conf) = readTVarIO (ipTransactionGraph conf)
922+transactionGraph_ _ = error "remote connection used"
923+
924+--used in tests only
925+disconnectedTransaction_ :: SessionId -> Connection -> IO DisconnectedTransaction
926+disconnectedTransaction_ sessionId (InProcessConnection conf) = do
927+ let sessions = ipSessions conf
928+ mSession <- atomically $ StmMap.lookup sessionId sessions
929+ case mSession of
930+ Nothing -> error "No such session"
931+ Just (Sess.Session discon _) -> pure discon
932+disconnectedTransaction_ _ _= error "remote connection used"
933+
934+-- wrap a graph evaluation in file locking
935+commitLock_ :: SessionId ->
936+ InProcessConnectionConf ->
937+ (TransactionGraph ->
938+ STM (Either RelationalError (DisconnectedTransaction, TransactionGraph, [TransactionId]))) ->
939+ IO (Either RelationalError ())
940+commitLock_ sessionId conf stmBlock = do
941+ let sessions = ipSessions conf
942+ strat = ipPersistenceStrategy conf
943+ mScriptSession = ipScriptSession conf
944+ graphTvar = ipTransactionGraph conf
945+ clientNodes = ipClientNodes conf
946+ mLockFileH = ipLocks conf
947+ lockHandler body = case mLockFileH of
948+ Nothing -> body False
949+ Just (lockFileH, lockMVar) ->
950+ let acquireLocks = do
951+ lastWrittenDigest <- takeMVar lockMVar
952+ lockFile lockFileH WriteLock
953+ latestDigest <- readGraphTransactionIdDigest strat
954+ pure (latestDigest /= lastWrittenDigest)
955+ releaseLocks _ = do
956+ --still holding the lock- get the latest digest
957+ gDigest <- readGraphTransactionIdDigest strat
958+ unlockFile lockFileH
959+ putMVar lockMVar gDigest
960+ in bracket acquireLocks releaseLocks body
961+ manip <- lockHandler $ \dbWrittenByOtherProcess -> atomically $ do
962+ eSession <- sessionForSessionId sessionId sessions
963+ --handle graph update by other process
964+ oldGraph <- readTVar graphTvar
965+ case eSession of
966+ Left err -> pure (Left err)
967+ Right session -> do
968+ let dbdir = case strat of
969+ MinimalPersistence x -> x
970+ CrashSafePersistence x -> x
971+ _ -> error "accessing dbdir on non-persisted connection"
972+ --this should also happen for non-commit expressions
973+ eRefreshedGraph <- if dbWrittenByOtherProcess then
974+ unsafeIOToSTM (transactionGraphLoad dbdir oldGraph mScriptSession)
975+ else
976+ pure (Right oldGraph)
977+ case eRefreshedGraph of
978+ Left err -> pure (Left (DatabaseLoadError err))
979+ Right refreshedGraph -> do
980+ eGraph <- stmBlock refreshedGraph
981+ case eGraph of
982+ Left err -> pure (Left err)
983+ Right (discon', graph', transactionIdsToPersist) -> do
984+ writeTVar graphTvar graph'
985+ let newSession = Session discon' (Sess.schemaName session)
986+ StmMap.insert newSession sessionId sessions
987+ case RE.transactionForId (Sess.parentId session) oldGraph of
988+ Left err -> pure $ Left err
989+ Right previousTrans ->
990+ if not (Prelude.null transactionIdsToPersist) then do
991+ (evaldNots, nodes) <- executeCommitExprSTM_ graph' (Trans.concreteDatabaseContext previousTrans) (Sess.concreteDatabaseContext session) clientNodes
992+ nodesToNotify <- stmSetToList nodes
993+ pure $ Right (evaldNots, nodesToNotify, graph', transactionIdsToPersist)
994+ else pure (Right (M.empty, [], graph', []))
995+
996+ --handle notification firing
997+ case manip of
998+ Left err -> pure (Left err)
999+ Right (notsToFire, nodesToNotify, newGraph, transactionIdsToPersist) -> do
1000+ --update filesystem database, if necessary
1001+ processTransactionGraphPersistence strat transactionIdsToPersist newGraph
1002+ sendNotifications nodesToNotify notsToFire
1003+ pure (Right ())
1004+
1005+-- | Runs an IO monad, commits the result when the monad returns no errors, otherwise, rolls back the changes and the error.
1006+withTransaction :: SessionId -> Connection -> IO (Either RelationalError a) -> IO (Either RelationalError ()) -> IO (Either RelationalError a)
1007+withTransaction sessionId conn io successFunc = bracketOnError (pure ()) (const do_rollback) block
1008+ where
1009+ do_rollback = rollback sessionId conn
1010+ block _ = do
1011+ eErr <- io
1012+ case eErr of
1013+ Left err -> do
1014+ _ <- do_rollback
1015+ pure (Left err)
1016+ Right val -> do
1017+ eIsDirty <- disconnectedTransactionIsDirty sessionId conn
1018+ case eIsDirty of
1019+ Left err -> pure (Left err)
1020+ Right dirty ->
1021+ if dirty then do
1022+ res <- successFunc
1023+ case res of
1024+ Left err -> pure (Left err)
1025+ Right _ -> pure (Right val)
1026+ else -- no updates executed, so don't create a commit
1027+ pure (Right val)
1028+
1029+executeDataFrameExpr :: SessionId -> Connection -> DF.DataFrameExpr -> IO (Either RelationalError DF.DataFrame)
1030+executeDataFrameExpr sessionId conn@(InProcessConnection _) dfExpr = do
1031+ eRel <- executeRelationalExpr sessionId conn (DF.convertExpr dfExpr)
1032+ case eRel of
1033+ Left err -> pure (Left err)
1034+ Right rel -> do
1035+ let relAttrs = R.attributes rel
1036+ attrName (DF.AttributeOrderExpr name _) = name
1037+ order (DF.AttributeOrderExpr _ ord) = ord
1038+ orders = map order (DF.orderExprs dfExpr)
1039+ attributeForName' = flip attributeForName relAttrs
1040+ attrNames = map attrName (DF.orderExprs dfExpr)
1041+ verified = forM attrNames attributeForName'
1042+ case verified of
1043+ Left err -> pure (Left err)
1044+ Right attrs -> do
1045+ let attrOrders = zipWith
1046+ (DF.AttributeOrder . attributeName)
1047+ attrs
1048+ orders
1049+ case DF.sortDataFrameBy attrOrders . DF.toDataFrame $ rel of
1050+ Left err -> pure (Left err)
1051+ Right dFrame -> do
1052+ let dFrame' = maybe dFrame (`DF.drop'` dFrame) (DF.offset dfExpr)
1053+ dFrame'' = maybe dFrame' (`DF.take'` dFrame') (DF.limit dfExpr)
1054+ pure (Right dFrame'')
1055+executeDataFrameExpr sessionId conn@(RemoteConnection _) dfExpr = remoteCall conn (ExecuteDataFrameExpr sessionId dfExpr)
1056+
1057+validateMerkleHashes :: SessionId -> Connection -> IO (Either RelationalError ())
1058+validateMerkleHashes sessionId (InProcessConnection conf) = do
1059+ let sessions = ipSessions conf
1060+ atomically $ do
1061+ eSession <- sessionForSessionId sessionId sessions
1062+ case eSession of
1063+ Left err -> pure (Left err)
1064+ Right _ -> do
1065+ graph <- readTVar (ipTransactionGraph conf)
1066+ case Graph.validateMerkleHashes graph of
1067+ Left merkleErrs -> pure $ Left $ someErrors (map (\(MerkleValidationError tid expected actual) -> MerkleHashValidationError tid expected actual) merkleErrs)
1068+ Right () -> pure (Right ())
1069+validateMerkleHashes sessionId conn@RemoteConnection{} = remoteCall conn (ExecuteValidateMerkleHashes sessionId)
1070+
1071+type ClientNodes = StmSet.Set ClientInfo
1072+
1073+-- internal structure specific to in-process connections
1074+data InProcessConnectionConf = InProcessConnectionConf {
1075+ ipPersistenceStrategy :: PersistenceStrategy,
1076+ ipClientNodes :: ClientNodes,
1077+ ipSessions :: Sessions,
1078+ ipTransactionGraph :: TVar TransactionGraph,
1079+ ipScriptSession :: Maybe ScriptSession,
1080+ ipLocks :: Maybe (LockFile, MVar LockFileHash), -- nothing when NoPersistence
1081+ ipCallbackAsync :: Async ()
1082+ }
1083+
1084+-- clients may connect associate one socket/mvar with the server to register for change callbacks
1085+data ClientInfo = RemoteClientInfo (RPC.Locking Socket) |
1086+ InProcessClientInfo (MVar EvaluatedNotifications)
1087+
1088+instance Eq ClientInfo where
1089+ (RemoteClientInfo a) == (RemoteClientInfo b) = RPC.lockless a == RPC.lockless b
1090+ (InProcessClientInfo a) == (InProcessClientInfo b) = a == b
1091+ _ == _ = False
1092+
1093+instance Hashable ClientInfo where
1094+ hashWithSalt salt (RemoteClientInfo sock) = hashWithSalt salt (show (RPC.lockless sock))
1095+ hashWithSalt salt (InProcessClientInfo _) = hashWithSalt salt (1::Int)
src/lib/ProjectM36/Client/Simple.hsnew file+129
@@ -0,0 +1,129 @@
1+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
2+-- | A simplified client interface for Project:M36 database access.
3+module ProjectM36.Client.Simple (
4+ simpleConnectProjectM36,
5+ simpleConnectProjectM36At,
6+ withTransaction,
7+ withTransactionUsing,
8+ execute,
9+ executeOrErr,
10+ query,
11+ queryOrErr,
12+ cancelTransaction,
13+ orCancelTransaction,
14+ rollback,
15+ close,
16+ Atom(..),
17+ AtomType(..),
18+ Db,
19+ DbConn,
20+ DbError(..),
21+ RelationalError(..),
22+ Attribute(..),
23+ C.Atomable(toAtom, fromAtom),
24+ C.ConnectionInfo(..),
25+ C.PersistenceStrategy(..),
26+ C.NotificationCallback,
27+ C.emptyNotificationCallback,
28+ C.DatabaseContextExprBase(..),
29+ C.DatabaseContextExpr,
30+ C.RelationalExprBase(..)
31+ ) where
32+
33+import Control.Exception.Base
34+import Control.Monad ((<=<))
35+import Control.Monad.Reader
36+import ProjectM36.Base
37+import qualified ProjectM36.Client as C
38+import ProjectM36.Error
39+
40+type DbConn = (C.SessionId, C.Connection)
41+
42+newtype Db a = Db {runDb :: ReaderT DbConn IO a}
43+ deriving (Functor, Applicative, Monad, MonadIO)
44+
45+-- This exception type should never be observable by the API users.
46+-- It merely carries errors which end up as RelError at the end of a transaction.
47+newtype TransactionCancelled = TransactionCancelled DbError deriving Show
48+instance Exception TransactionCancelled
49+
50+-- | A simple alternative to 'connectProjectM36' which includes simple session management.
51+simpleConnectProjectM36At :: HeadName -> C.ConnectionInfo -> IO (Either DbError DbConn)
52+simpleConnectProjectM36At headName connInfo = do
53+ eConn <- C.connectProjectM36 connInfo
54+ case eConn of
55+ Left err -> pure (Left (ConnError err))
56+ Right conn -> do
57+ eSess <- C.createSessionAtHead conn headName
58+ case eSess of
59+ Left err -> do
60+ C.close conn
61+ pure (Left (RelError err))
62+ Right sess -> pure (Right (sess, conn))
63+
64+-- | Same as 'simpleConnectProjectM36At' but always connects to the @master@ branch.
65+simpleConnectProjectM36 :: C.ConnectionInfo -> IO (Either DbError DbConn)
66+simpleConnectProjectM36 = simpleConnectProjectM36At "master"
67+
68+-- | Closes the database connection.
69+close :: DbConn -> IO ()
70+close (_ , conn) = C.close conn
71+
72+-- | Runs a Db monad which may include some database updates. If an exception or error occurs, the transaction is rolled back. Otherwise, the transaction is committed to the head of the current branch.
73+withTransaction :: DbConn -> Db a -> IO (Either DbError a)
74+withTransaction sessconn = withTransactionUsing sessconn UnionMergeStrategy
75+
76+-- | Same as 'withTransaction' except that the merge strategy can be specified.
77+withTransactionUsing :: DbConn -> MergeStrategy -> Db a -> IO (Either DbError a)
78+withTransactionUsing (sess, conn) strat dbm = do
79+ eHeadName <- C.headName sess conn
80+ case eHeadName of
81+ Left err -> pure (Left (RelError err))
82+ Right headName -> do
83+ let successFunc = C.autoMergeToHead sess conn strat headName
84+ block = runReaderT (runDb dbm) (sess, conn)
85+ handler :: TransactionCancelled -> IO (Either DbError a)
86+ handler (TransactionCancelled err) = pure (Left err)
87+ handle handler $ do
88+ ret <- C.withTransaction sess conn (Right <$> block) successFunc
89+ case ret of
90+ Left err -> pure (Left (RelError err))
91+ Right val -> pure (Right val)
92+
93+-- | A union of connection and other errors that can be returned from 'withTransaction'.
94+data DbError = ConnError C.ConnectionError |
95+ RelError RelationalError |
96+ TransactionRolledBack
97+ deriving (Eq, Show)
98+
99+-- | Execute a 'DatabaseContextExpr' in the 'DB' monad. Database context expressions manipulate the state of the database. In case of an error, the transaction is terminated and the connection's session is rolled back.
100+execute :: C.DatabaseContextExpr -> Db ()
101+execute = orCancelTransaction <=< executeOrErr
102+
103+-- | Run a 'RelationalExpr' query in the 'DB' monad. Relational expressions perform read-only queries against the current database state.
104+query :: C.RelationalExpr -> Db Relation
105+query = orCancelTransaction <=< queryOrErr
106+
107+-- | Run a 'DatabaseContextExpr' update expression. If there is an error, just return it without cancelling the current transaction.
108+executeOrErr :: C.DatabaseContextExpr -> Db (Either RelationalError ())
109+executeOrErr expr = Db $ do
110+ (sess, conn) <- ask
111+ lift $ C.executeDatabaseContextExpr sess conn expr
112+
113+-- | Run a 'RelationalExpr' query expression. If there is an error, just return it without cancelling the transaction.
114+queryOrErr :: C.RelationalExpr -> Db (Either RelationalError Relation)
115+queryOrErr expr = Db $ do
116+ (sess, conn) <- ask
117+ lift $ C.executeRelationalExpr sess conn expr
118+
119+-- | Unconditionally roll back the current transaction and throw an exception to terminate the execution of the Db monad.
120+rollback :: Db ()
121+rollback = cancelTransaction TransactionRolledBack
122+
123+-- | Cancel a transaction and carry some error information with it.
124+cancelTransaction :: DbError -> Db a
125+cancelTransaction err = liftIO $ throwIO (TransactionCancelled err)
126+
127+-- | Converts the 'Either' result from a 'Db' action into an immediate cancel in the case of error.
128+orCancelTransaction :: Either RelationalError a -> Db a
129+orCancelTransaction = either (cancelTransaction . RelError) pure
src/lib/ProjectM36/ConcreteTypeRep.hsdeleted−34
@@ -1,34 +0,0 @@
1−{-# LANGUAGE GeneralizedNewtypeDeriving, DeriveGeneric #-}
2−-- adapted from https://hackage.haskell.org/package/concrete-typerep
3−module ProjectM36.ConcreteTypeRep where
4−import Data.Binary
5−import Data.Typeable
6−import Data.Typeable.Internal
7−import Control.DeepSeq (NFData)
8−import GHC.Generics
9−
10−newtype ConcreteTypeRep = CTR { unCTR :: TypeRep } deriving (Eq, Typeable, NFData)
11−
12−newtype SerialRep = SR (TyConRep, [SerialRep]) deriving (Binary, Generic)
13−
14−instance Show ConcreteTypeRep where
15− show (CTR tRep) = show tRep
16−
17−type TyConRep = (String, String, String)
18−toTyConRep :: TyCon -> TyConRep
19−toTyConRep (TyCon _ pack modul name) = (pack, modul, name)
20−
21−fromTyConRep :: TyConRep -> TyCon
22−fromTyConRep (pack, modul, name) = mkTyCon3 pack modul name
23−
24−toSerial :: ConcreteTypeRep -> SerialRep
25−toSerial (CTR t) = case splitTyConApp t of
26− (con, args) -> SR (toTyConRep con, map (toSerial . CTR) args)
27−
28−fromSerial :: SerialRep -> ConcreteTypeRep
29−fromSerial (SR (con, args)) = CTR $ mkTyConApp (fromTyConRep con) (map (unCTR . fromSerial) args)
30−
31−instance Binary ConcreteTypeRep where
32− put = put . toSerial
33− get = fromSerial <$> get
34−
src/lib/ProjectM36/DataConstructorDef.hs+4−4
@@ -1,6 +1,5 @@
11module ProjectM36.DataConstructorDef where
2−import ProjectM36.Base
3−import qualified ProjectM36.TypeConstructor as TC
2+import ProjectM36.Base as B
43import qualified Data.Set as S
54
65emptyDataConstructor :: DataConstructorName -> DataConstructorDef
@@ -16,5 +15,6 @@ typeVars :: DataConstructorDef -> S.Set TypeVarName
1615typeVars (DataConstructorDef _ tConsArgs) = S.unions $ map typeVarsInDefArg tConsArgs
1716
1817typeVarsInDefArg :: DataConstructorDefArg -> S.Set TypeVarName
19−typeVarsInDefArg (DataConstructorDefTypeConstructorArg tCons) = TC.typeVars tCons
20−typeVarsInDefArg (DataConstructorDefTypeVarNameArg pVarName) = S.singleton pVarName
18+typeVarsInDefArg (DataConstructorDefTypeConstructorArg tCons) = B.typeVars tCons
19+typeVarsInDefArg (DataConstructorDefTypeVarNameArg pVarName) = S.singleton pVarName
20+
src/lib/ProjectM36/DataFrame.hsnew file+183
@@ -0,0 +1,183 @@
1+{-# LANGUAGE DeriveGeneric, DerivingVia #-}
2+{- A dataframe is a strongly-typed, ordered list of named tuples. A dataframe differs from a relation in that its tuples are ordered.-}
3+module ProjectM36.DataFrame where
4+import ProjectM36.Base
5+import ProjectM36.Attribute as A hiding (drop)
6+import ProjectM36.Error
7+import qualified ProjectM36.Relation as R
8+import ProjectM36.Relation.Show.Term
9+import qualified ProjectM36.Relation.Show.HTML as RelHTML
10+import ProjectM36.DataTypes.Sorting
11+import ProjectM36.AtomType
12+import ProjectM36.Atom
13+import qualified Data.Vector as V
14+import GHC.Generics
15+import qualified Data.List as L
16+import qualified Data.Set as S
17+import Data.Maybe
18+import qualified Data.Text as T
19+import Control.Arrow
20+#if __GLASGOW_HASKELL__ < 804
21+import Data.Monoid
22+#endif
23+
24+data AttributeOrderExpr = AttributeOrderExpr AttributeName Order
25+ deriving (Show, Generic)
26+
27+data AttributeOrder = AttributeOrder AttributeName Order
28+ deriving (Show, Generic)
29+
30+data Order = AscendingOrder | DescendingOrder
31+ deriving (Eq, Show, Generic)
32+
33+ascending :: T.Text
34+ascending = "⬆"
35+
36+descending :: T.Text
37+descending = "⬇"
38+
39+arbitrary :: T.Text
40+arbitrary = "↕"
41+
42+data DataFrame = DataFrame {
43+ orders :: [AttributeOrder],
44+ attributes :: Attributes,
45+ tuples :: [DataFrameTuple]
46+ }
47+ deriving (Show, Generic)
48+
49+data DataFrameTuple = DataFrameTuple Attributes (V.Vector Atom)
50+ deriving (Eq, Show, Generic)
51+
52+sortDataFrameBy :: [AttributeOrder] -> DataFrame -> Either RelationalError DataFrame
53+sortDataFrameBy attrOrders frame = do
54+ attrs <- mapM (\(AttributeOrder nam _) -> A.attributeForName nam (attributes frame)) attrOrders
55+ mapM_ (\attr -> if not (isSortableAtomType (atomType attr)) then
56+ Left (AttributeNotSortableError attr)
57+ else
58+ pure ()) attrs
59+ pure $ DataFrame attrOrders (attributes frame) (sortTuplesBy (compareTupleByAttributeOrders attrOrders) (tuples frame))
60+
61+sortTuplesBy :: (DataFrameTuple -> DataFrameTuple -> Ordering) -> [DataFrameTuple] -> [DataFrameTuple]
62+sortTuplesBy = L.sortBy
63+
64+compareTupleByAttributeOrders :: [AttributeOrder] -> DataFrameTuple -> DataFrameTuple -> Ordering
65+compareTupleByAttributeOrders attributeOrders tup1 tup2 =
66+ let compare' (AttributeOrder attr order) = if order == DescendingOrder
67+ then compareTupleByOneAttributeName attr tup2 tup1
68+ else compareTupleByOneAttributeName attr tup1 tup2
69+ res = map compare' attributeOrders in
70+ fromMaybe EQ (L.find (/= EQ) res)
71+
72+compareTupleByOneAttributeName :: AttributeName -> DataFrameTuple -> DataFrameTuple -> Ordering
73+compareTupleByOneAttributeName attr tuple1 tuple2 =
74+ let eAtom1 = atomForAttributeName attr tuple1
75+ eAtom2 = atomForAttributeName attr tuple2 in
76+ case eAtom1 of
77+ Left err -> error (show err)
78+ Right atom1 ->
79+ case eAtom2 of
80+ Left err -> error (show err)
81+ Right atom2 -> compareAtoms atom1 atom2
82+
83+atomForAttributeName :: AttributeName -> DataFrameTuple -> Either RelationalError Atom
84+atomForAttributeName attrName (DataFrameTuple tupAttrs tupVec) = case V.findIndex (\attr -> attributeName attr == attrName) (attributesVec tupAttrs) of
85+ Nothing -> Left (NoSuchAttributeNamesError (S.singleton attrName))
86+ Just index -> case tupVec V.!? index of
87+ Nothing -> Left (NoSuchAttributeNamesError (S.singleton attrName))
88+ Just atom -> Right atom
89+
90+take' :: Integer -> DataFrame -> DataFrame
91+take' n df = df { tuples = take (fromInteger n) (tuples df) }
92+
93+drop' :: Integer -> DataFrame -> DataFrame
94+drop' n df = df { tuples = drop (fromInteger n) (tuples df) }
95+
96+toDataFrame :: Relation -> DataFrame
97+toDataFrame (Relation attrs (RelationTupleSet tuples')) = DataFrame [] attrs (map (\(RelationTuple tupAttrs tupVec) -> DataFrameTuple tupAttrs tupVec) tuples')
98+
99+fromDataFrame :: DataFrame -> Either RelationalError Relation
100+fromDataFrame df = R.mkRelation (attributes df) (RelationTupleSet tuples')
101+ where
102+ tuples' = map (\(DataFrameTuple attrs' tupVec) -> RelationTuple attrs' tupVec) (tuples df)
103+
104+showDataFrame :: DataFrame -> T.Text
105+showDataFrame = renderTable . dataFrameAsTable
106+
107+--terminal display
108+dataFrameAsTable :: DataFrame -> Table
109+dataFrameAsTable df = (header, body)
110+ where
111+ oAttrNames = orderedAttributeNames (attributes df)
112+ oAttrs = orderedAttributes (attributes df)
113+ header = "DF" : map dfPrettyAttribute oAttrs
114+ dfPrettyAttribute attr = prettyAttribute attr <> case L.find (\(AttributeOrder nam _) -> nam == attributeName attr) (orders df) of
115+ Nothing -> arbitrary
116+ Just (AttributeOrder _ AscendingOrder) -> ascending
117+ Just (AttributeOrder _ DescendingOrder) -> descending
118+ body = snd (L.foldl' tupleFolder (1 :: Int,[]) (tuples df))
119+ tupleFolder (count, acc) tuple = (count + 1,
120+ acc ++ [T.pack (show count) : map (\attrName -> case atomForAttributeName attrName tuple of
121+ Left _ -> "?"
122+ Right atom -> showAtom 0 atom
123+ ) oAttrNames])
124+
125+-- | A Relation can be converted to a DataFrame for sorting, limits, and offsets.
126+data DataFrameExpr = DataFrameExpr {
127+ convertExpr :: RelationalExpr,
128+ orderExprs :: [AttributeOrderExpr],
129+ offset :: Maybe Integer,
130+ limit :: Maybe Integer
131+ }
132+ deriving (Show, Generic)
133+
134+dataFrameAsHTML :: DataFrame -> T.Text
135+-- web browsers don't display tables with empty cells or empty headers, so we have to insert some placeholders- it's not technically the same, but looks as expected in the browser
136+dataFrameAsHTML df
137+ | length (tuples df) == 1 && A.null (attributes df) = style <>
138+ tablestart <>
139+ "<tr><th></th></tr>" <>
140+ "<tr><td></td></tr>" <>
141+ tablefooter <> "</table>"
142+ | L.null (tuples df) && A.null (attributes df) = style <>
143+ tablestart <>
144+ "<tr><th></th></tr>" <>
145+ tablefooter <>
146+ "</table>"
147+ | otherwise = style <>
148+ tablestart <>
149+ attributesAsHTML (attributes df) (orders df) <>
150+ tuplesAsHTML (tuples df) <>
151+ tablefooter <>
152+ "</table>"
153+ where
154+ cardinality = T.pack (show (length (tuples df)))
155+ style = "<style>.pm36dataframe {empty-cells: show;} .pm36dataframe tbody td, .pm36relation th { border: 1px solid black;}</style>"
156+ tablefooter = "<tfoot><tr><td colspan=\"100%\">" <> cardinality <> " tuples</td></tr></tfoot>"
157+ tablestart = "<table class=\"pm36dataframe\"\">"
158+
159+tuplesAsHTML :: [DataFrameTuple] -> T.Text
160+tuplesAsHTML = foldr folder ""
161+ where
162+ folder tuple acc = acc <> tupleAsHTML tuple
163+
164+tupleAssocs :: DataFrameTuple -> [(AttributeName, Atom)]
165+tupleAssocs (DataFrameTuple attrs tupVec) = V.toList $ V.map (first attributeName) (V.zip (attributesVec attrs) tupVec)
166+
167+
168+tupleAsHTML :: DataFrameTuple -> T.Text
169+tupleAsHTML tuple = "<tr>" <> T.concat (L.map tupleFrag (tupleAssocs tuple)) <> "</tr>"
170+ where
171+ tupleFrag tup = "<td>" <> atomAsHTML (snd tup) <> "</td>"
172+ atomAsHTML (RelationAtom rel) = RelHTML.relationAsHTML rel
173+ atomAsHTML (TextAtom t) = "&quot;" <> t <> "&quot;"
174+ atomAsHTML atom = atomToText atom
175+
176+attributesAsHTML :: Attributes -> [AttributeOrder] -> T.Text
177+attributesAsHTML attrs orders' = "<tr>" <> T.concat (map oneAttrHTML (A.toList attrs)) <> "</tr>"
178+ where
179+ oneAttrHTML attr = "<th>" <> prettyAttribute attr <> ordering (attributeName attr) <> "</th>"
180+ ordering attrName = " " <> case L.find (\(AttributeOrder nam _) -> nam == attrName) orders' of
181+ Nothing -> "(arb)"
182+ Just (AttributeOrder _ AscendingOrder) -> "(asc)"
183+ Just (AttributeOrder _ DescendingOrder) -> "(desc)"
src/lib/ProjectM36/DataTypes/Basic.hs+10−5
@@ -1,14 +1,19 @@
11-- wraps up primitives plus other basic data types
22module ProjectM36.DataTypes.Basic where
33import ProjectM36.DataTypes.Primitive
4−import ProjectM36.DataTypes.Day
54import ProjectM36.DataTypes.Either
65import ProjectM36.DataTypes.Maybe
6+import ProjectM36.DataTypes.List
7+import ProjectM36.DataTypes.NonEmptyList
8+import ProjectM36.DataTypes.Interval
79import ProjectM36.Base
810
911basicTypeConstructorMapping :: TypeConstructorMapping
10−basicTypeConstructorMapping = (primitiveTypeConstructorMapping ++
11− maybeTypeConstructorMapping ++
12− eitherTypeConstructorMapping ++
13− dayTypeConstructorMapping)
12+basicTypeConstructorMapping = primitiveTypeConstructorMapping ++
13+ maybeTypeConstructorMapping ++
14+ eitherTypeConstructorMapping ++
15+ listTypeConstructorMapping ++
16+ nonEmptyListTypeConstructorMapping ++
17+ intervalTypeConstructorMapping
18+
1419
src/lib/ProjectM36/DataTypes/ByteString.hsnew file+18
@@ -0,0 +1,18 @@
1+module ProjectM36.DataTypes.ByteString where
2+import ProjectM36.Base
3+import ProjectM36.AtomFunctionError
4+import ProjectM36.AtomFunctionBody
5+import qualified Data.HashSet as HS
6+import qualified Data.ByteString.Base64 as B64
7+import qualified Data.Text.Encoding as TE
8+
9+bytestringAtomFunctions :: AtomFunctions
10+bytestringAtomFunctions = HS.fromList [
11+ AtomFunction { atomFuncName = "bytestring",
12+ atomFuncType = [TextAtomType, ByteStringAtomType],
13+ atomFuncBody = compiledAtomFunctionBody $ \(TextAtom textIn:_) -> case B64.decode (TE.encodeUtf8 textIn) of
14+ Left err -> Left (AtomFunctionBytesDecodingError err)
15+ Right bs -> pure (ByteStringAtom bs)
16+ }
17+ ]
18+
src/lib/ProjectM36/DataTypes/DateTime.hsnew file+14
@@ -0,0 +1,14 @@
1+module ProjectM36.DataTypes.DateTime where
2+import ProjectM36.Base
3+import ProjectM36.AtomFunctionBody
4+import qualified Data.HashSet as HS
5+import Data.Time.Clock.POSIX
6+
7+dateTimeAtomFunctions :: AtomFunctions
8+dateTimeAtomFunctions = HS.fromList [ AtomFunction {
9+ atomFuncName = "dateTimeFromEpochSeconds",
10+ atomFuncType = [IntegerAtomType, DateTimeAtomType],
11+ atomFuncBody = compiledAtomFunctionBody $ \(IntegerAtom epoch:_) -> pure (DateTimeAtom (posixSecondsToUTCTime (realToFrac epoch)))
12+ }]
13+
14+
src/lib/ProjectM36/DataTypes/Day.hs+3−6
@@ -7,14 +7,11 @@ import Data.Time.Calendar
77dayAtomFunctions :: AtomFunctions
88dayAtomFunctions = HS.fromList [
99 AtomFunction { atomFuncName = "fromGregorian",
10− atomFuncType = [IntAtomType, IntAtomType, IntAtomType, DayAtomType],
11− atomFuncBody = compiledAtomFunctionBody $ \((IntAtom year):(IntAtom month):(IntAtom day):_) -> DayAtom (fromGregorian (fromIntegral year) month day)
10+ atomFuncType = [IntegerAtomType, IntegerAtomType, IntegerAtomType, DayAtomType],
11+ atomFuncBody = compiledAtomFunctionBody $ \(IntegerAtom year:IntegerAtom month:IntegerAtom day:_) -> pure $ DayAtom (fromGregorian (fromIntegral year) (fromIntegral month) (fromIntegral day))
1212 },
1313 AtomFunction { atomFuncName = "dayEarlierThan",
1414 atomFuncType = [DayAtomType, DayAtomType, BoolAtomType],
15− atomFuncBody = compiledAtomFunctionBody $ \((ConstructedAtom _ _ (IntAtom dayA:_)):(ConstructedAtom _ _ (IntAtom dayB:_)):_) -> BoolAtom (dayA < dayB)
15+ atomFuncBody = compiledAtomFunctionBody $ \(ConstructedAtom _ _ (IntAtom dayA:_):ConstructedAtom _ _ (IntAtom dayB:_):_) -> pure (BoolAtom (dayA < dayB))
1616 }
1717 ]
18−
19−dayTypeConstructorMapping :: TypeConstructorMapping
20−dayTypeConstructorMapping = [] -- use fromGregorian
src/lib/ProjectM36/DataTypes/Either.hs+1−1
@@ -14,5 +14,5 @@ eitherTypeConstructorMapping = [(ADTypeConstructorDef "Either" ["a", "b"],
1414
1515eitherAtomFunctions :: AtomFunctions
1616eitherAtomFunctions = HS.fromList [
17− compiledAtomFunction "isLeft" [eitherAtomType AnyAtomType AnyAtomType, BoolAtomType] $ \((ConstructedAtom dConsName _ _):_) -> BoolAtom (dConsName == "Left")
17+ compiledAtomFunction "isLeft" [eitherAtomType (TypeVariableType "a") (TypeVariableType "b"), BoolAtomType] $ \(ConstructedAtom dConsName _ _:_) -> pure (BoolAtom (dConsName == "Left"))
1818 ]
src/lib/ProjectM36/DataTypes/Interval.hs+140−31
@@ -1,37 +1,146 @@
1−{-# LANGUAGE GeneralizedNewtypeDeriving, StandaloneDeriving #-}
21{-# OPTIONS_GHC -fno-warn-orphans #-}
32module ProjectM36.DataTypes.Interval where
4−import Data.Interval
5−import ProjectM36.Base hiding (Finite)
6−import Data.Binary
7−import ProjectM36.Atom
8−import Data.Typeable
9−import Data.Time.Clock
3+import ProjectM36.AtomFunctionBody
4+import ProjectM36.Base
5+import ProjectM36.AtomType
6+import ProjectM36.DataTypes.Primitive
7+import ProjectM36.AtomFunctionError
8+import qualified Data.HashSet as HS
9+import qualified Data.Map as M
10+import Control.Monad (when)
11+import Data.Maybe
1012
11−instance (Atomable a, Ord a) => Atomable (Interval a)
13+type OpenInterval = Bool
1214
13−instance (Binary a) => Binary (Extended a) where
14− put ext = case ext of
15− NegInf -> put (1 :: Int)
16− PosInf -> put (2 :: Int)
17− Finite x -> put (3 :: Int) >> put x
18− get = do
19− flag <- get :: Get Int
20− case flag of
21− 1 -> pure NegInf
22− 2 -> pure PosInf
23− 3 -> Finite <$> get
24− _ -> error "poop"
25−
26−instance (Ord a, Binary a) => Binary (Interval a) where
27− put interv = put (lowerBound interv) >> put (upperBound interv)
28− get = interval <$> get <*> get
15+intervalSubType :: AtomType -> AtomType
16+intervalSubType typ = if isIntervalAtomType typ then
17+ case typ of
18+ ConstructedAtomType _ tvMap ->
19+ fromMaybe err (M.lookup "a" tvMap)
20+ _ -> err
21+ else
22+ err
23+ where
24+ err = error "intervalSubType on non-interval type"
25+
26+
27+-- in lieu of typeclass support, we just hard-code the types which can be part of an interval
28+supportsInterval :: AtomType -> Bool
29+supportsInterval typ = case typ of
30+ IntAtomType -> True
31+ IntegerAtomType -> True
32+ DoubleAtomType -> True
33+ TextAtomType -> False -- just because it supports ordering, doesn't mean it makes sense in an interval
34+ DayAtomType -> True
35+ DateTimeAtomType -> True
36+ ByteStringAtomType -> False
37+ BoolAtomType -> False
38+ RelationAtomType _ -> False
39+ ConstructedAtomType _ _ -> False --once we support an interval-style typeclass, we might enable this
40+ RelationalExprAtomType -> False
41+ TypeVariableType _ -> False
42+
43+supportsOrdering :: AtomType -> Bool
44+supportsOrdering typ = case typ of
45+ IntAtomType -> True
46+ IntegerAtomType -> True
47+ DoubleAtomType -> True
48+ TextAtomType -> True
49+ DayAtomType -> True
50+ DateTimeAtomType -> True
51+ ByteStringAtomType -> False
52+ BoolAtomType -> False
53+ RelationAtomType _ -> False
54+ RelationalExprAtomType -> False
55+ ConstructedAtomType _ _ -> False --once we support an interval-style typeclass, we might enable this
56+ TypeVariableType _ -> False
2957
30−intervalFunctions :: [AtomFunction]
31−intervalFunctions = [AtomFunction { atomFuncName = "interval_dt_member",
32− atomFuncType = [dateTimeAtomType,
33− atomTypeForProxy (Proxy :: Proxy (Interval UTCTime)),
34− boolAtomType],
35− atomFunc = (\(dt:dtinterval:_) -> Atom $ member ((unsafeCast dt)::UTCTime) ((unsafeCast dtinterval)::(Interval UTCTime)))}
58+atomCompare :: Atom -> Atom -> Either AtomFunctionError Ordering
59+atomCompare a1 a2 = let aType = atomTypeForAtom a1
60+ go a b = Right (compare a b)
61+ typError = Left (AtomTypeDoesNotSupportOrderingError (prettyAtomType aType)) in
62+ if atomTypeForAtom a1 /= atomTypeForAtom a2 then
63+ Left AtomFunctionTypeMismatchError
64+ else if not (supportsOrdering aType) then
65+ typError
66+ else
67+ case (a1, a2) of
68+ (IntegerAtom a, IntegerAtom b) -> go a b
69+ (IntAtom a, IntAtom b) -> go a b
70+ (DoubleAtom a, DoubleAtom b) -> go a b
71+ (TextAtom a, TextAtom b) -> go a b
72+ (DayAtom a, DayAtom b) -> go a b
73+ (DateTimeAtom a, DateTimeAtom b) -> go a b
74+ _ -> typError
75+
76+--check that interval is properly ordered and that the boundaries make sense
77+createInterval :: Atom -> Atom -> OpenInterval -> OpenInterval -> Either AtomFunctionError Atom
78+createInterval atom1 atom2 bopen eopen = do
79+ cmp <- atomCompare atom1 atom2
80+ case cmp of
81+ GT -> Left InvalidIntervalOrderingError
82+ EQ -> if bopen || eopen then
83+ Left InvalidIntervalBoundariesError
84+ else
85+ Right valid
86+ LT -> Right valid
87+ where valid = ConstructedAtom "Interval" iType [atom1, atom2, BoolAtom bopen, BoolAtom eopen]
88+ iType = intervalAtomType (atomTypeForAtom atom1)
89+
90+intervalAtomType :: AtomType -> AtomType
91+intervalAtomType typ = ConstructedAtomType "Interval" (M.singleton "a" typ)
92+
93+intervalAtomFunctions :: AtomFunctions
94+intervalAtomFunctions = HS.fromList [
95+ AtomFunction { atomFuncName = "interval",
96+ atomFuncType = [TypeVariableType "a",
97+ TypeVariableType "a",
98+ BoolAtomType,
99+ BoolAtomType,
100+ intervalAtomType (TypeVariableType "a")],
101+ atomFuncBody = compiledAtomFunctionBody $ \(atom1:atom2:BoolAtom bopen:BoolAtom eopen:_) -> do
102+ let aType = atomTypeForAtom atom1
103+ if supportsInterval aType then
104+ createInterval atom1 atom2 bopen eopen
105+ else
106+ Left (AtomTypeDoesNotSupportIntervalError (prettyAtomType aType))
107+ },
108+ AtomFunction {
109+ atomFuncName = "interval_overlaps",
110+ atomFuncType = [intervalAtomType (TypeVariableType "a"),
111+ intervalAtomType (TypeVariableType "a"),
112+ BoolAtomType],
113+ atomFuncBody = compiledAtomFunctionBody $ \(i1@ConstructedAtom{}:i2@ConstructedAtom{}:_) ->
114+ BoolAtom <$> intervalOverlaps i1 i2
115+ }]
116+
117+isIntervalAtomType :: AtomType -> Bool
118+isIntervalAtomType (ConstructedAtomType nam tvMap) =
119+ nam == "Interval" && M.keys tvMap == ["a"] && case M.lookup "a" tvMap of
120+ Nothing -> False
121+ Just subType -> supportsInterval subType || subType == TypeVariableType "a"
122+isIntervalAtomType _ = False
123+
124+intervalOverlaps :: Atom -> Atom -> Either AtomFunctionError Bool
125+intervalOverlaps (ConstructedAtom dCons1 typ1 [i1start,
126+ i1end,
127+ BoolAtom i1startopen,
128+ BoolAtom i1endopen]) (ConstructedAtom dCons2 typ2
129+ [i2start,
130+ i2end,
131+ BoolAtom i2startopen,
132+ BoolAtom i2endopen]) = do
133+ when (dCons1 /= "Interval" || dCons2 /= "Interval" || not (isIntervalAtomType typ1) || not (isIntervalAtomType typ2)) (Left AtomFunctionTypeMismatchError)
134+ cmp1 <- atomCompare i1start i2end
135+ cmp2 <- atomCompare i2start i1end
136+ let startcmp = if i1startopen || i2endopen then oplt else oplte
137+ endcmp = if i2startopen || i1endopen then oplt else oplte
138+ oplte op = op == LT || op == EQ
139+ oplt op = op == LT
140+ pure (startcmp cmp1 && endcmp cmp2)
141+intervalOverlaps _ _ = Left AtomFunctionTypeMismatchError
36142
37− ]
143+intervalTypeConstructorMapping :: TypeConstructorMapping
144+intervalTypeConstructorMapping = [(ADTypeConstructorDef "Interval" ["a"], [])]
145+
146+
src/lib/ProjectM36/DataTypes/List.hsnew file+53
@@ -0,0 +1,53 @@
1+module ProjectM36.DataTypes.List where
2+import ProjectM36.Base
3+import ProjectM36.DataTypes.Maybe
4+import ProjectM36.DataTypes.Primitive
5+import qualified Data.Map as M
6+import qualified Data.HashSet as HS
7+import ProjectM36.AtomFunctionError
8+
9+listAtomType :: AtomType -> AtomType
10+listAtomType arg = ConstructedAtomType "List" (M.singleton "a" arg)
11+
12+listTypeConstructorMapping :: TypeConstructorMapping
13+listTypeConstructorMapping = [(ADTypeConstructorDef "List" ["a"],
14+ [DataConstructorDef "Empty" [],
15+ DataConstructorDef "Cons" [DataConstructorDefTypeVarNameArg "a",
16+ DataConstructorDefTypeConstructorArg (ADTypeConstructor "List" [TypeVariable "a"])]])]
17+
18+listLength :: Atom -> Either AtomFunctionError Int
19+listLength (ConstructedAtom "Cons" _ (_:nextCons:_)) = do
20+ c <- listLength nextCons
21+ pure (c + 1)
22+listLength (ConstructedAtom "Empty" _ _) = pure 0
23+listLength _ = Left AtomFunctionTypeMismatchError
24+
25+listMaybeHead :: Atom -> Either AtomFunctionError Atom
26+listMaybeHead (ConstructedAtom "Cons" _ (val:_)) = pure (ConstructedAtom "Just" aType [val])
27+ where
28+ aType = maybeAtomType (atomTypeForAtom val)
29+listMaybeHead (ConstructedAtom "Empty" (ConstructedAtomType _ tvMap) _) =
30+ case M.lookup "a" tvMap of
31+ Nothing -> Left AtomFunctionTypeMismatchError
32+ Just aType -> pure (ConstructedAtom "Nothing" aType [])
33+listMaybeHead _ = Left AtomFunctionTypeMismatchError
34+
35+listAtomFunctions :: AtomFunctions
36+listAtomFunctions = HS.fromList [
37+ AtomFunction {
38+ atomFuncName = "length",
39+ atomFuncType = [listAtomType (TypeVariableType "a"), IntAtomType],
40+ atomFuncBody = AtomFunctionBody Nothing (\(listAtom:_) ->
41+ IntAtom . fromIntegral <$> listLength listAtom)
42+ },
43+ AtomFunction {
44+ atomFuncName = "maybeHead",
45+ atomFuncType = [listAtomType (TypeVariableType "a"), maybeAtomType (TypeVariableType "a")],
46+ atomFuncBody = AtomFunctionBody Nothing (\(listAtom:_) -> listMaybeHead listAtom)
47+ }
48+ ]
49+
50+--just a private utility function
51+listCons :: AtomType -> [Atom] -> Atom
52+listCons typ [] = ConstructedAtom "Empty" (listAtomType typ) []
53+listCons typ (a:as) = ConstructedAtom "Cons" (listAtomType typ) [a, listCons typ as]
src/lib/ProjectM36/DataTypes/Maybe.hs+19−3
@@ -1,5 +1,7 @@
11module ProjectM36.DataTypes.Maybe where
22import ProjectM36.Base
3+import ProjectM36.DataTypes.Primitive
4+import ProjectM36.AtomFunctionError
35import qualified Data.HashSet as HS
46import qualified Data.Map as M
57
@@ -16,7 +18,21 @@ maybeAtomFunctions :: AtomFunctions
1618maybeAtomFunctions = HS.fromList [
1719 AtomFunction {
1820 atomFuncName ="isJust",
19− atomFuncType = [maybeAtomType AnyAtomType, BoolAtomType],
20− atomFuncBody = AtomFunctionBody Nothing $ \((ConstructedAtom dConsName _ _):_) -> BoolAtom (dConsName == "Nothing")
21− }
21+ atomFuncType = [maybeAtomType (TypeVariableType "a"), BoolAtomType],
22+ atomFuncBody = AtomFunctionBody Nothing $ \(ConstructedAtom dConsName _ _:_) -> pure $ BoolAtom (dConsName /= "Nothing")
23+ },
24+ AtomFunction {
25+ atomFuncName = "fromMaybe",
26+ atomFuncType = [TypeVariableType "a", maybeAtomType (TypeVariableType "a"), TypeVariableType "a"],
27+ atomFuncBody = AtomFunctionBody Nothing $ \(defaultAtom:ConstructedAtom dConsName _ (atomVal:_):_) -> if atomTypeForAtom defaultAtom /= atomTypeForAtom atomVal then Left AtomFunctionTypeMismatchError else if dConsName == "Nothing" then pure defaultAtom else pure atomVal
28+ }
2229 ]
30+
31+{- To create an inclusion dependency for uniqueness for "Just a" values only
32+person := relation{name Text, boss Maybe Text}{tuple{name "Steve",boss Nothing}, tuple{name "Bob", boss Just "Steve"}}
33+:showexpr ((relation{tuple{}}:{a:=person where ^isJust(@boss)}):{b:=count(@a)}){b}
34+:showexpr ((relation{tuple{}}:{a:=person{boss} where ^isJust(@boss)}):{b:=count(@a)}){b}
35+constraint uniqueJust ((relation{tuple{}}:{a:=person where ^isJust(@boss)}):{b:=count(@a)}){b} in ((relation{tuple{}}:{a:=person{boss} where ^isJust(@boss)}):{b:=count(@a)}){b}
36+person := relation{name Text, boss Maybe Text}{tuple{name "Steve",boss Nothing}, tuple{name "Bob", boss Just "Steve"}, tuple{name "Jim", boss Just "Steve"}}
37+ERR: InclusionDependencyCheckError "uniqueJust"
38+-}
src/lib/ProjectM36/DataTypes/NonEmptyList.hsnew file+53
@@ -0,0 +1,53 @@
1+module ProjectM36.DataTypes.NonEmptyList where
2+import ProjectM36.Base
3+import qualified Data.Map as M
4+import qualified Data.HashSet as HS
5+import ProjectM36.AtomFunctionError
6+import ProjectM36.DataTypes.List
7+
8+nonEmptyListAtomType :: AtomType -> AtomType
9+nonEmptyListAtomType arg = ConstructedAtomType "NonEmptyList" (M.singleton "a" arg)
10+
11+-- data NonEmptyList = NECons a (Cons a)
12+nonEmptyListTypeConstructorMapping :: TypeConstructorMapping
13+nonEmptyListTypeConstructorMapping = [(ADTypeConstructorDef "NonEmptyList" ["a"],
14+ [DataConstructorDef "NECons" [DataConstructorDefTypeVarNameArg "a",
15+ DataConstructorDefTypeConstructorArg (ADTypeConstructor "List" [TypeVariable "a"])]])]
16+
17+nonEmptyListLength :: Atom -> Either AtomFunctionError Int
18+nonEmptyListLength (ConstructedAtom "NECons" _ (_:nextCons:_)) = do
19+ c <- listLength nextCons
20+ pure (c + 1)
21+nonEmptyListLength (ConstructedAtom "NECons" _ _) = pure 1
22+nonEmptyListLength _ = Left AtomFunctionTypeMismatchError
23+
24+nonEmptyListHead :: Atom -> Either AtomFunctionError Atom
25+nonEmptyListHead (ConstructedAtom "NECons" _ (val:_)) = pure val
26+nonEmptyListHead _ = Left AtomFunctionTypeMismatchError
27+
28+{-
29+listMaybeHead :: Atom -> Either AtomFunctionError Atom
30+listMaybeHead (ConstructedAtom "Cons" _ (val:_)) = pure (ConstructedAtom "Just" aType [val])
31+ where
32+ aType = maybeAtomType (atomTypeForAtom val)
33+listMaybeHead (ConstructedAtom "Empty" (ConstructedAtomType _ tvMap) _) =
34+ case M.lookup "a" tvMap of
35+ Nothing -> Left AtomFunctionTypeMismatchError
36+ Just aType -> pure (ConstructedAtom "Nothing" aType [])
37+listMaybeHead _ = Left AtomFunctionTypeMismatchError
38+-}
39+
40+nonEmptyListAtomFunctions :: AtomFunctions
41+nonEmptyListAtomFunctions = HS.fromList [
42+ AtomFunction {
43+ atomFuncName = "nonEmptyListLength",
44+ atomFuncType = [nonEmptyListAtomType (TypeVariableType "a"), IntAtomType],
45+ atomFuncBody = AtomFunctionBody Nothing (\(nonEmptyListAtom:_) ->
46+ IntAtom . fromIntegral <$> nonEmptyListLength nonEmptyListAtom)
47+ },
48+ AtomFunction {
49+ atomFuncName = "nonEmptyListHead",
50+ atomFuncType = [nonEmptyListAtomType (TypeVariableType "a"), TypeVariableType "a"],
51+ atomFuncBody = AtomFunctionBody Nothing (\(nonEmptyListAtom:_) -> nonEmptyListHead nonEmptyListAtom)
52+ }
53+ ]
src/lib/ProjectM36/DataTypes/Primitive.hs+22−2
@@ -5,16 +5,35 @@ primitiveTypeConstructorMapping :: TypeConstructorMapping
55primitiveTypeConstructorMapping = map (\(name, aType) ->
66 (PrimitiveTypeConstructorDef name aType, [])) prims
77 where
8− prims = [("Int", IntAtomType),
8+ prims = [("Integer", IntegerAtomType),
9+ ("Int", IntAtomType),
910 ("Text", TextAtomType),
1011 ("Double", DoubleAtomType),
1112 ("Bool", BoolAtomType),
12− ("ByteString", ByteStringAtomType)
13+ ("ByteString", ByteStringAtomType),
14+ ("DateTime", DateTimeAtomType),
15+ ("Day", DayAtomType)
1316 ]
17+
18+intTypeConstructor :: TypeConstructor
19+intTypeConstructor = PrimitiveTypeConstructor "Int" IntAtomType
20+
21+doubleTypeConstructor :: TypeConstructor
22+doubleTypeConstructor = PrimitiveTypeConstructor "Double" DoubleAtomType
23+
24+textTypeConstructor :: TypeConstructor
25+textTypeConstructor = PrimitiveTypeConstructor "Text" TextAtomType
26+
27+dayTypeConstructor :: TypeConstructor
28+dayTypeConstructor = PrimitiveTypeConstructor "Day" DayAtomType
29+
30+dateTimeTypeConstructor :: TypeConstructor
31+dateTimeTypeConstructor = PrimitiveTypeConstructor "DateTime" DayAtomType
1432
1533-- | Return the type of an 'Atom'.
1634atomTypeForAtom :: Atom -> AtomType
1735atomTypeForAtom (IntAtom _) = IntAtomType
36+atomTypeForAtom (IntegerAtom _) = IntegerAtomType
1837atomTypeForAtom (DoubleAtom _) = DoubleAtomType
1938atomTypeForAtom (TextAtom _) = TextAtomType
2039atomTypeForAtom (DayAtom _) = DayAtomType
@@ -23,3 +42,4 @@ atomTypeForAtom (ByteStringAtom _) = ByteStringAtomType
2342atomTypeForAtom (BoolAtom _) = BoolAtomType
2443atomTypeForAtom (RelationAtom (Relation attrs _)) = RelationAtomType attrs
2544atomTypeForAtom (ConstructedAtom _ aType _) = aType
45+atomTypeForAtom (RelationalExprAtom _) = RelationalExprAtomType
src/lib/ProjectM36/DataTypes/Sorting.hsnew file+31
@@ -0,0 +1,31 @@
1+module ProjectM36.DataTypes.Sorting where
2+import ProjectM36.Base
3+
4+compareAtoms :: Atom -> Atom -> Ordering
5+compareAtoms (IntegerAtom i1) (IntegerAtom i2) = compare i1 i2
6+compareAtoms (IntAtom i1) (IntAtom i2) = compare i1 i2
7+compareAtoms (DoubleAtom d1) (DoubleAtom d2) = compare d1 d2
8+compareAtoms (TextAtom t1) (TextAtom t2) = compare t1 t2
9+compareAtoms (DayAtom d1) (DayAtom d2) = compare d1 d2
10+compareAtoms (DateTimeAtom d1) (DateTimeAtom d2) = compare d1 d2
11+compareAtoms (ByteStringAtom b1) (ByteStringAtom b2) = compare b1 b2
12+compareAtoms (BoolAtom b1) (BoolAtom b2) = compare b1 b2
13+compareAtoms (RelationAtom _) _ = EQ
14+compareAtoms ConstructedAtom{} _ = EQ
15+compareAtoms _ _ = EQ
16+
17+isSortableAtomType :: AtomType -> Bool
18+isSortableAtomType typ = case typ of
19+ IntAtomType -> True
20+ IntegerAtomType -> True
21+ DoubleAtomType -> True
22+ TextAtomType -> True
23+ DayAtomType -> True
24+ DateTimeAtomType -> True
25+ ByteStringAtomType -> False
26+ BoolAtomType -> True
27+ RelationalExprAtomType -> False
28+ RelationAtomType _ -> False
29+ ConstructedAtomType _ _ -> False
30+ TypeVariableType _ -> False
31+
src/lib/ProjectM36/DatabaseContext.hs+27−5
@@ -1,32 +1,54 @@
11module ProjectM36.DatabaseContext where
22import ProjectM36.Base
3+import Control.Monad (void)
34import qualified Data.Map as M
45import qualified Data.HashSet as HS
56import ProjectM36.DataTypes.Basic
67import ProjectM36.AtomFunctions.Basic
78import ProjectM36.Relation
9+import qualified Data.ByteString.Lazy as BL
10+import ProjectM36.AtomFunction as AF
11+import ProjectM36.DatabaseContextFunction as DBCF
12+import Codec.Winery
813
914empty :: DatabaseContext
1015empty = DatabaseContext { inclusionDependencies = M.empty,
1116 relationVariables = M.empty,
1217 notifications = M.empty,
1318 atomFunctions = HS.empty,
19+ dbcFunctions = HS.empty,
1420 typeConstructorMapping = [] }
21+
22+-- | Remove TransactionId markers on GraphRefRelationalExpr
23+stripGraphRefRelationalExpr :: GraphRefRelationalExpr -> RelationalExpr
24+stripGraphRefRelationalExpr = void
1525
1626-- | convert an existing database context into its constituent expression.
1727databaseContextAsDatabaseContextExpr :: DatabaseContext -> DatabaseContextExpr
1828databaseContextAsDatabaseContextExpr context = MultipleExpr $ relVarsExprs ++ incDepsExprs ++ funcsExprs
1929 where
20− relVarsExprs = map (\(name, rel) -> Assign name (ExistingRelation rel)) (M.toList (relationVariables context))
30+ relVarsExprs = map (\(name, rel) -> Assign name (stripGraphRefRelationalExpr rel)) (M.toList (relationVariables context))
2131 incDepsExprs :: [DatabaseContextExpr]
22− incDepsExprs = map (\(name, dep) -> AddInclusionDependency name dep) (M.toList (inclusionDependencies context))
23− funcsExprs = [] -- map (\func -> ) (HS.toList funcs) -- there are no databaseExprs to add atom functions yet
32+ incDepsExprs = map (uncurry AddInclusionDependency) (M.toList (inclusionDependencies context))
33+ funcsExprs = [] -- map (\func -> ) (HS.toList funcs) -- there are no databaseExprs to add atom functions yet-}
2434
2535basicDatabaseContext :: DatabaseContext
2636basicDatabaseContext = DatabaseContext { inclusionDependencies = M.empty,
27− relationVariables = M.fromList [("true", relationTrue),
28− ("false", relationFalse)],
37+ relationVariables = M.fromList [("true", ExistingRelation relationTrue),
38+ ("false", ExistingRelation relationFalse)],
2939 atomFunctions = basicAtomFunctions,
40+ dbcFunctions = basicDatabaseContextFunctions,
3041 notifications = M.empty,
3142 typeConstructorMapping = basicTypeConstructorMapping
3243 }
44+
45+--for building the Merkle hash
46+hashBytes :: DatabaseContext -> BL.ByteString
47+hashBytes ctx = BL.fromChunks [incDeps, rvs, nots, tConsMap] <> atomFs <> dbcFs
48+ where
49+ incDeps = serialise (inclusionDependencies ctx)
50+ rvs = serialise (relationVariables ctx)
51+ atomFs = HS.foldr (mappend . AF.hashBytes) mempty (atomFunctions ctx)
52+ dbcFs = HS.foldr (mappend . DBCF.hashBytes) mempty (dbcFunctions ctx)
53+ nots = serialise (notifications ctx)
54+ tConsMap = serialise (typeConstructorMapping ctx)
src/lib/ProjectM36/DatabaseContextFunction.hsnew file+91
@@ -0,0 +1,91 @@
1+{-# LANGUAGE CPP #-}
2+module ProjectM36.DatabaseContextFunction where
3+--implements functions which operate as: [Atom] -> DatabaseContextExpr -> Either RelationalError DatabaseContextExpr
4+import ProjectM36.Base
5+import ProjectM36.Error
6+import ProjectM36.Serialise.Base ()
7+import ProjectM36.Attribute as A
8+import ProjectM36.Relation
9+import ProjectM36.AtomType
10+import qualified Data.HashSet as HS
11+import qualified Data.Map as M
12+import ProjectM36.ScriptSession
13+import qualified Data.Text as T
14+import qualified Data.ByteString.Lazy as BL
15+import Codec.Winery
16+
17+emptyDatabaseContextFunction :: DatabaseContextFunctionName -> DatabaseContextFunction
18+emptyDatabaseContextFunction name = DatabaseContextFunction {
19+ dbcFuncName = name,
20+ dbcFuncType = [],
21+ dbcFuncBody = DatabaseContextFunctionBody Nothing (\_ ctx -> pure ctx)
22+ }
23+
24+databaseContextFunctionForName :: DatabaseContextFunctionName -> DatabaseContextFunctions -> Either RelationalError DatabaseContextFunction
25+databaseContextFunctionForName funcName funcs = if HS.null foundFunc then
26+ Left $ NoSuchFunctionError funcName
27+ else
28+ Right (head (HS.toList foundFunc))
29+ where
30+ foundFunc = HS.filter (\(DatabaseContextFunction name _ _) -> name == funcName) funcs
31+
32+evalDatabaseContextFunction :: DatabaseContextFunction -> [Atom] -> DatabaseContext -> Either RelationalError DatabaseContext
33+evalDatabaseContextFunction func args ctx = case dbcFuncBody func of
34+ (DatabaseContextFunctionBody _ f) -> case f args ctx of
35+ Left err -> Left (DatabaseContextFunctionUserError err)
36+ Right c -> pure c
37+
38+basicDatabaseContextFunctions :: DatabaseContextFunctions
39+basicDatabaseContextFunctions = HS.fromList [
40+ DatabaseContextFunction { dbcFuncName = "deleteAll",
41+ dbcFuncType = [],
42+ dbcFuncBody = DatabaseContextFunctionBody Nothing (\_ ctx -> pure $ ctx { relationVariables = M.empty })
43+ }
44+ ]
45+
46+--the precompiled functions are special because they cannot be serialized. Their names are therefore used in perpetuity so that the functions can be "serialized" (by name).
47+precompiledDatabaseContextFunctions :: DatabaseContextFunctions
48+precompiledDatabaseContextFunctions = HS.filter (not . isScriptedDatabaseContextFunction) basicDatabaseContextFunctions
49+
50+isScriptedDatabaseContextFunction :: DatabaseContextFunction -> Bool
51+isScriptedDatabaseContextFunction func = case dbcFuncBody func of
52+ DatabaseContextFunctionBody (Just _) _ -> True
53+ DatabaseContextFunctionBody Nothing _ -> False
54+
55+databaseContextFunctionScript :: DatabaseContextFunction -> Maybe DatabaseContextFunctionBodyScript
56+databaseContextFunctionScript func = case dbcFuncBody func of
57+ DatabaseContextFunctionBody script _ -> script
58+
59+databaseContextFunctionReturnType :: TypeConstructor -> TypeConstructor
60+databaseContextFunctionReturnType tCons = ADTypeConstructor "Either" [
61+ ADTypeConstructor "DatabaseContextFunctionError" [],
62+ tCons]
63+
64+createScriptedDatabaseContextFunction :: DatabaseContextFunctionName -> [TypeConstructor] -> TypeConstructor -> DatabaseContextFunctionBodyScript -> DatabaseContextIOExpr
65+createScriptedDatabaseContextFunction funcName argsIn retArg = AddDatabaseContextFunction funcName (argsIn ++ [databaseContextFunctionReturnType retArg])
66+
67+loadDatabaseContextFunctions :: ModName -> FuncName -> FilePath -> IO (Either LoadSymbolError [DatabaseContextFunction])
68+#ifdef PM36_HASKELL_SCRIPTING
69+loadDatabaseContextFunctions = loadFunction
70+#else
71+loadDatabaseContextFunctions _ _ _ = pure (Left LoadSymbolError)
72+#endif
73+
74+databaseContextFunctionsAsRelation :: DatabaseContextFunctions -> Either RelationalError Relation
75+databaseContextFunctionsAsRelation dbcFuncs = mkRelationFromList attrs tups
76+ where
77+ attrs = A.attributesFromList [Attribute "name" TextAtomType,
78+ Attribute "arguments" TextAtomType]
79+ tups = map dbcFuncToTuple (HS.toList dbcFuncs)
80+ dbcFuncToTuple func = [TextAtom (dbcFuncName func),
81+ TextAtom (dbcTextType (dbcFuncType func))]
82+ dbcTextType typ = T.intercalate " -> " (map prettyAtomType typ ++ ["DatabaseContext", "DatabaseContext"])
83+
84+-- for merkle hash
85+hashBytes :: DatabaseContextFunction -> BL.ByteString
86+hashBytes func = BL.fromChunks [fname, ftype, fbody]
87+ where
88+ fname = serialise (dbcFuncName func)
89+ ftype = serialise (dbcFuncType func)
90+ fbody = case dbcFuncBody func of
91+ DatabaseContextFunctionBody mBody _ -> serialise mBody
src/lib/ProjectM36/DatabaseContextFunctionError.hsnew file+8
@@ -0,0 +1,8 @@
1+{-# LANGUAGE DeriveGeneric, DeriveAnyClass #-}
2+module ProjectM36.DatabaseContextFunctionError where
3+import GHC.Generics
4+import Control.DeepSeq
5+
6+{-# ANN module ("HLint: ignore Use newtype instead of data" :: String) #-}
7+data DatabaseContextFunctionError = DatabaseContextFunctionUserError String
8+ deriving (Generic, Eq, Show, NFData)
src/lib/ProjectM36/DatabaseContextFunctionUtils.hsnew file+22
@@ -0,0 +1,22 @@
1+module ProjectM36.DatabaseContextFunctionUtils where
2+import ProjectM36.RelationalExpression
3+import ProjectM36.Base
4+import ProjectM36.DatabaseContextFunctionError
5+import ProjectM36.Error
6+import ProjectM36.StaticOptimizer
7+
8+executeDatabaseContextExpr :: DatabaseContextExpr -> TransactionId -> TransactionGraph -> DatabaseContext -> Either DatabaseContextFunctionError DatabaseContext
9+executeDatabaseContextExpr expr transId graph context' =
10+ case run of
11+ Right st -> pure (dbc_context st)
12+ Left err -> error (show err)
13+ where
14+ env = mkDatabaseContextEvalEnv transId graph
15+ run = runDatabaseContextEvalMonad context' env (optimizeAndEvalDatabaseContextExpr True expr)
16+
17+executeRelationalExpr :: RelationalExpr -> DatabaseContext -> TransactionGraph -> Either RelationalError Relation
18+executeRelationalExpr expr context graph =
19+ run
20+ where
21+ env = mkRelationalExprEnv context graph
22+ run = optimizeAndEvalRelationalExpr env expr
src/lib/ProjectM36/DateExamples.hs+38−35
@@ -10,23 +10,26 @@ import qualified Data.Map as M
1010import qualified Data.Set as S
1111
1212dateExamples :: DatabaseContext
13−dateExamples = DatabaseContext { inclusionDependencies = dateIncDeps,
13+dateExamples = empty { inclusionDependencies = dateIncDeps,
1414 relationVariables = M.union (relationVariables basicDatabaseContext) dateRelVars,
1515 notifications = M.empty,
1616 atomFunctions = basicAtomFunctions,
1717 typeConstructorMapping = basicTypeConstructorMapping }
1818 where -- these must be lower case now that data constructors are in play
19− dateRelVars = M.fromList [("s", suppliers),
20− ("p", products),
21− ("sp", supplierProducts)]
19+ dateRelVars = M.fromList [("s", ExistingRelation suppliers),
20+ ("p", ExistingRelation products),
21+ ("sp", ExistingRelation supplierProducts)]
2222 suppliers = suppliersRel
2323 products = productsRel
2424 supplierProducts = supplierProductsRel
25− dateIncDeps = M.fromList [("s_pkey", simplePKey ["s#"] "s"),
26− ("p_pkey", simplePKey ["p#"] "p"),
27− ("sp_pkey", simplePKey ["s#", "p#"] "sp")
28− ]
29− simplePKey attrNames relvarName = inclusionDependencyForKey (AttributeNames $ S.fromList attrNames) (RelationVariable relvarName)
25+ dateIncDeps = M.fromList [
26+ ("s_pkey", simplePKey ["s#"] "s"),
27+ ("p_pkey", simplePKey ["p#"] "p"),
28+ ("sp_pkey", simplePKey ["s#", "p#"] "sp"),
29+ ("s_sp_fk", inclusionDependencyForForeignKey ("sp", ["s#"]) ("s", ["s#"])),
30+ ("p_sp_fk", inclusionDependencyForForeignKey ("sp", ["p#"]) ("p", ["p#"]))
31+ ]
32+ simplePKey attrNames relvarName = inclusionDependencyForKey (AttributeNames $ S.fromList attrNames) (RelationVariable relvarName ())
3033
3134suppliersRel :: Relation
3235suppliersRel = case mkRelationFromList attrs atomMatrix of
@@ -35,14 +38,14 @@ suppliersRel = case mkRelationFromList attrs atomMatrix of
3538 where
3639 attrs = A.attributesFromList [Attribute "s#" TextAtomType,
3740 Attribute "sname" TextAtomType,
38− Attribute "status" IntAtomType,
41+ Attribute "status" IntegerAtomType,
3942 Attribute "city" TextAtomType]
4043 atomMatrix = [
41− [TextAtom "S1", TextAtom "Smith", IntAtom 20, TextAtom "London"],
42− [TextAtom "S2", TextAtom "Jones", IntAtom 10, TextAtom "Paris"],
43− [TextAtom "S3", TextAtom "Blake", IntAtom 30, TextAtom "Paris"],
44− [TextAtom "S4", TextAtom "Clark", IntAtom 20, TextAtom "London"],
45− [TextAtom "S5", TextAtom "Adams", IntAtom 30, TextAtom "Athens"]]
44+ [TextAtom "S1", TextAtom "Smith", IntegerAtom 20, TextAtom "London"],
45+ [TextAtom "S2", TextAtom "Jones", IntegerAtom 10, TextAtom "Paris"],
46+ [TextAtom "S3", TextAtom "Blake", IntegerAtom 30, TextAtom "Paris"],
47+ [TextAtom "S4", TextAtom "Clark", IntegerAtom 20, TextAtom "London"],
48+ [TextAtom "S5", TextAtom "Adams", IntegerAtom 30, TextAtom "Athens"]]
4649
4750supplierProductsRel :: Relation
4851supplierProductsRel = case mkRelationFromList attrs matrix of
@@ -51,20 +54,20 @@ supplierProductsRel = case mkRelationFromList attrs matrix of
5154 where
5255 attrs = A.attributesFromList [Attribute "s#" TextAtomType,
5356 Attribute "p#" TextAtomType,
54− Attribute "qty" IntAtomType]
57+ Attribute "qty" IntegerAtomType]
5558 matrix = [
56− [TextAtom "S1", TextAtom "P1", IntAtom 300],
57− [TextAtom "S1", TextAtom "P2", IntAtom 200],
58− [TextAtom "S1", TextAtom "P3", IntAtom 400],
59− [TextAtom "S1", TextAtom "P4", IntAtom 200],
60− [TextAtom "S1", TextAtom "P5", IntAtom 100],
61− [TextAtom "S1", TextAtom "P6", IntAtom 100],
62− [TextAtom "S2", TextAtom "P1", IntAtom 300],
63− [TextAtom "S2", TextAtom "P2", IntAtom 400],
64− [TextAtom "S3", TextAtom "P2", IntAtom 200],
65− [TextAtom "S4", TextAtom "P2", IntAtom 200],
66− [TextAtom "S4", TextAtom "P4", IntAtom 300],
67− [TextAtom "S4", TextAtom "P5", IntAtom 400]
59+ [TextAtom "S1", TextAtom "P1", IntegerAtom 300],
60+ [TextAtom "S1", TextAtom "P2", IntegerAtom 200],
61+ [TextAtom "S1", TextAtom "P3", IntegerAtom 400],
62+ [TextAtom "S1", TextAtom "P4", IntegerAtom 200],
63+ [TextAtom "S1", TextAtom "P5", IntegerAtom 100],
64+ [TextAtom "S1", TextAtom "P6", IntegerAtom 100],
65+ [TextAtom "S2", TextAtom "P1", IntegerAtom 300],
66+ [TextAtom "S2", TextAtom "P2", IntegerAtom 400],
67+ [TextAtom "S3", TextAtom "P2", IntegerAtom 200],
68+ [TextAtom "S4", TextAtom "P2", IntegerAtom 200],
69+ [TextAtom "S4", TextAtom "P4", IntegerAtom 300],
70+ [TextAtom "S4", TextAtom "P5", IntegerAtom 400]
6871 ]
6972
7073productsRel :: Relation
@@ -75,13 +78,13 @@ productsRel = case mkRelationFromList attrs matrix of
7578 attrs = A.attributesFromList [Attribute "p#" TextAtomType,
7679 Attribute "pname" TextAtomType,
7780 Attribute "color" TextAtomType,
78− Attribute "weight" IntAtomType,
81+ Attribute "weight" IntegerAtomType,
7982 Attribute "city" TextAtomType]
8083 matrix = [
81− [TextAtom "P1", TextAtom "Nut", TextAtom "Red", IntAtom 12, TextAtom "London"],
82− [TextAtom "P2", TextAtom "Bolt", TextAtom "Green", IntAtom 17, TextAtom "Paris"],
83− [TextAtom "P3", TextAtom "Screw", TextAtom "Blue", IntAtom 17, TextAtom "Oslo"],
84− [TextAtom "P4", TextAtom "Screw", TextAtom "Red", IntAtom 14, TextAtom "London"],
85− [TextAtom "P5", TextAtom "Cam", TextAtom "Blue", IntAtom 12, TextAtom "Paris"],
86− [TextAtom "P6", TextAtom "Cog", TextAtom "Red", IntAtom 19, TextAtom "London"]
84+ [TextAtom "P1", TextAtom "Nut", TextAtom "Red", IntegerAtom 12, TextAtom "London"],
85+ [TextAtom "P2", TextAtom "Bolt", TextAtom "Green", IntegerAtom 17, TextAtom "Paris"],
86+ [TextAtom "P3", TextAtom "Screw", TextAtom "Blue", IntegerAtom 17, TextAtom "Oslo"],
87+ [TextAtom "P4", TextAtom "Screw", TextAtom "Red", IntegerAtom 14, TextAtom "London"],
88+ [TextAtom "P5", TextAtom "Cam", TextAtom "Blue", IntegerAtom 12, TextAtom "Paris"],
89+ [TextAtom "P6", TextAtom "Cog", TextAtom "Red", IntegerAtom 19, TextAtom "London"]
8790 ]
src/lib/ProjectM36/DisconnectedTransaction.hsnew file+17
@@ -0,0 +1,17 @@
1+module ProjectM36.DisconnectedTransaction where
2+import ProjectM36.Base
3+
4+concreteDatabaseContext :: DisconnectedTransaction -> DatabaseContext
5+concreteDatabaseContext (DisconnectedTransaction _ (Schemas context _) _) = context
6+
7+schemas :: DisconnectedTransaction -> Schemas
8+schemas (DisconnectedTransaction _ s _) = s
9+
10+parentId :: DisconnectedTransaction -> TransactionId
11+parentId (DisconnectedTransaction pid _ _) = pid
12+
13+isDirty :: DisconnectedTransaction -> Bool
14+isDirty (DisconnectedTransaction _ _ flag) = flag
15+
16+freshTransaction :: TransactionId -> Schemas -> DisconnectedTransaction
17+freshTransaction tid schemas' = DisconnectedTransaction tid schemas' False
src/lib/ProjectM36/Error.hs+66−19
@@ -1,16 +1,21 @@
11{-# LANGUAGE DeriveGeneric, DeriveAnyClass #-}
22module ProjectM36.Error where
33import ProjectM36.Base
4+import ProjectM36.MerkleHash
5+import ProjectM36.DatabaseContextFunctionError
6+import ProjectM36.AtomFunctionError
47import qualified Data.Set as S
58import Control.DeepSeq (NFData, rnf)
69import Control.DeepSeq.Generics (genericRnf)
710import GHC.Generics (Generic)
811import qualified Data.Text as T
9−import Data.Binary
1012import Data.Typeable
13+import Control.Exception
1114
1215data RelationalError = NoSuchAttributeNamesError (S.Set AttributeName)
1316 | TupleAttributeCountMismatchError Int --attribute name
17+ | EmptyAttributesError
18+ | DuplicateAttributeNamesError (S.Set AttributeName)
1419 | TupleAttributeTypeMismatchError Attributes
1520 | AttributeCountMismatchError Int
1621 | AttributeNamesMismatchError (S.Set AttributeName)
@@ -19,7 +24,7 @@ data RelationalError = NoSuchAttributeNamesError (S.Set AttributeName)
1924 | CouldNotInferAttributes
2025 | RelVarNotDefinedError RelVarName
2126 | RelVarAlreadyDefinedError RelVarName
22− | RelVarAssignmentTypeMismatchError Attributes Attributes --expected, found
27+ | RelationTypeMismatchError Attributes Attributes --expected, found
2328 | InclusionDependencyCheckError IncDepName
2429 | InclusionDependencyNameInUseError IncDepName
2530 | InclusionDependencyNameNotInUseError IncDepName
@@ -30,7 +35,9 @@ data RelationalError = NoSuchAttributeNamesError (S.Set AttributeName)
3035 | RootTransactionTraversalError
3136 | HeadNameSwitchingHeadProhibitedError HeadName
3237 | NoSuchHeadNameError HeadName
38+ | UnknownHeadError
3339 | NewTransactionMayNotHaveChildrenError TransactionId
40+ | ParentCountTraversalError Int Int --maximum, requested
3441 | NewTransactionMissingParentError TransactionId
3542 | TransactionIsNotAHeadError TransactionId
3643 | TransactionGraphCycleError TransactionId
@@ -38,7 +45,7 @@ data RelationalError = NoSuchAttributeNamesError (S.Set AttributeName)
3845 | NoSuchSessionError TransactionId
3946 | FailedToFindTransactionError TransactionId
4047 | TransactionIdInUseError TransactionId
41− | NoSuchTupleExprFunctionError AtomFunctionName
48+ | NoSuchFunctionError AtomFunctionName
4249 | NoSuchTypeConstructorName TypeConstructorName
4350 | TypeConstructorAtomTypeMismatch TypeConstructorName AtomType
4451 | AtomTypeMismatchError AtomType AtomType
@@ -50,12 +57,17 @@ data RelationalError = NoSuchAttributeNamesError (S.Set AttributeName)
5057 | TypeConstructorTypeVarMissing TypeVarName
5158 | TypeConstructorTypeVarsTypesMismatch TypeConstructorName TypeVarMap TypeVarMap
5259 | DataConstructorTypeVarsMismatch DataConstructorName TypeVarMap TypeVarMap
60+ | AtomFunctionTypeVariableResolutionError AtomFunctionName TypeVarName
61+ | AtomFunctionTypeVariableMismatch TypeVarName AtomType AtomType
5362 | AtomTypeNameInUseError AtomTypeName
5463 | IncompletelyDefinedAtomTypeWithConstructorError
5564 | AtomTypeNameNotInUseError AtomTypeName
56− | AtomFunctionNameInUseError AtomFunctionName
57− | AtomFunctionNameNotInUseError AtomFunctionName
58− | AtomFunctionArgumentCountMismatch Int Int
65+ | AttributeNotSortableError Attribute
66+ | FunctionNameInUseError AtomFunctionName
67+ | FunctionNameNotInUseError AtomFunctionName
68+ | EmptyCommitError
69+ | FunctionArgumentCountMismatchError Int Int
70+ | ConstructedAtomArgumentCountMismatchError Int Int
5971 | NoSuchDataConstructorError DataConstructorName
6072 | NoSuchTypeConstructorError TypeConstructorName
6173 | InvalidAtomTypeName AtomTypeName
@@ -64,22 +76,41 @@ data RelationalError = NoSuchAttributeNamesError (S.Set AttributeName)
6476 | EmptyTuplesError -- used by persistent driver
6577 | AtomTypeCountError [AtomType] [AtomType]
6678 | AtomFunctionTypeError AtomFunctionName Int AtomType AtomType --arg number
79+ | AtomFunctionUserError AtomFunctionError
80+ | PrecompiledFunctionRemoveError AtomFunctionName -- pre-compiled atom functions cannot be serialized, so they cannot change over time- they are referred to in perpetuity
6781 | RelationValuedAttributesNotSupportedError [AttributeName]
6882 | NotificationNameInUseError NotificationName
6983 | NotificationNameNotInUseError NotificationName
70− | ImportError T.Text -- really? This should be broken out into some other error type- this has nothing to do with relational algebra
84+ | ImportError ImportError'
7185 | ExportError T.Text
7286 | UnhandledExceptionError String
7387 | MergeTransactionError MergeError
74− | AtomFunctionBodyScriptError AtomFunctionBodyCompilationError
88+ | ScriptError ScriptCompilationError
89+ | LoadFunctionError
90+ | DatabaseContextFunctionUserError DatabaseContextFunctionError
91+ | DatabaseLoadError PersistenceError
92+
93+ | SubschemaNameInUseError SchemaName
94+ | SubschemaNameNotInUseError SchemaName
95+
96+ | SchemaCreationError SchemaError
97+
98+ | ImproperDatabaseStateError
99+
100+ | NonConcreteSchemaPlanError
101+
102+ | NoUncommittedContextInEvalError
103+ | TupleExprsReferenceMultipleMarkersError
104+
105+ | MerkleHashValidationError TransactionId MerkleHash MerkleHash
106+
75107 | MultipleErrors [RelationalError]
76− deriving (Show,Eq,Generic,Binary,Typeable)
108+ deriving (Show,Eq,Generic,Typeable, NFData)
77109
78−instance NFData RelationalError where rnf = genericRnf
79−
80110data PersistenceError = InvalidDirectoryError FilePath |
81− MissingTransactionError TransactionId
82− deriving (Show, Eq, Generic)
111+ MissingTransactionError TransactionId |
112+ WrongDatabaseFormatVersionError String String
113+ deriving (Show, Eq, Generic, NFData)
83114
84115--collapse list of errors into normal error- if there is just one, just return one
85116someErrors :: [RelationalError] -> RelationalError
@@ -97,12 +128,28 @@ data MergeError = SelectedHeadMismatchMergeError |
97128 StrategyViolatesComponentMergeError | --failed merge in inc deps, relvars, etc.
98129 StrategyViolatesRelationVariableMergeError |
99130 StrategyViolatesTypeConstructorMergeError
100− deriving (Show, Eq, Generic, Binary, Typeable)
131+ deriving (Show, Eq, Generic, Typeable)
101132
102133instance NFData MergeError where rnf = genericRnf
103134
104−data AtomFunctionBodyCompilationError = TypeCheckCompilationError String String | --expected, got
105− SyntaxErrorCompilationError String |
106− OtherScriptCompilationError String
107− deriving (Show,Eq, Generic, Binary, Typeable, NFData)
108−
135+data ScriptCompilationError = TypeCheckCompilationError String String | --expected, got
136+ SyntaxErrorCompilationError String |
137+ ScriptCompilationDisabledError |
138+ OtherScriptCompilationError String
139+ deriving (Show, Eq, Generic, Typeable, NFData)
140+
141+instance Exception ScriptCompilationError
142+
143+data SchemaError = RelVarReferencesMissing (S.Set RelVarName) |
144+ RelVarInReferencedMoreThanOnce RelVarName |
145+ RelVarOutReferencedMoreThanOnce RelVarName
146+ deriving (Show, Eq, Generic, Typeable, NFData)
147+
148+
149+data ImportError' = InvalidSHA256Error T.Text
150+ | SHA256MismatchError T.Text T.Text
151+ | InvalidFileURIError T.Text
152+ | ImportFileDecodeError T.Text
153+ | ImportFileError T.Text
154+ | ImportDownloadError T.Text
155+ deriving (Show, Eq, Generic, Typeable, NFData)
src/lib/ProjectM36/FSType.hsnew file+102
@@ -0,0 +1,102 @@
1+{-# LANGUAGE CPP #-}
2+-- confirm that the filesystem type is a journaled FS type expected by Project:M36
3+-- use statfs on Linux and macOS and GetVolumeInformation on Windows
4+-- this could still be fooled with symlinks or by disabling journaling on filesystems that support that
5+module ProjectM36.FSType where
6+
7+#if defined(mingw32_HOST_OS)
8+# if defined(i386_HOST_ARCH)
9+# define WINDOWS_CCONV stdcall
10+# elif defined(x86_64_HOST_ARCH)
11+# define WINDOWS_CCONV ccall
12+# endif
13+import System.Win32.Types
14+import Foreign.ForeignPtr
15+import Data.Word
16+import Data.Bits
17+import Foreign.Storable
18+
19+foreign import WINDOWS_CCONV unsafe "windows.h GetVolumePathNameW"
20+ c_GetVolumePathName :: LPCTSTR -> LPTSTR -> DWORD -> IO BOOL
21+
22+foreign import WINDOWS_CCONV unsafe "windows.h GetVolumeInformationW"
23+ c_GetVolumeInformation :: LPCTSTR -> LPTSTR -> DWORD -> LPDWORD -> LPDWORD -> LPDWORD -> LPTSTR -> DWORD -> IO BOOL
24+
25+#define FILE_SUPPORTS_USN_JOURNAL 0x02000000
26+
27+getVolumePathName :: FilePath -> IO String
28+getVolumePathName path = do
29+ let maxpathlen = 260 --ANSI MAX_PATH- we only care about the drive name anyway
30+ withTString path $ \c_path -> do
31+ fp_pathout <- mallocForeignPtrBytes maxpathlen
32+ withForeignPtr fp_pathout $ \pathout -> do
33+ failIfFalse_ ("GetVolumePathNameW " ++ path) (c_GetVolumePathName c_path pathout (fromIntegral maxpathlen))
34+ peekTString pathout
35+
36+fsTypeSupportsJournaling :: FilePath -> IO Bool
37+fsTypeSupportsJournaling path = do
38+ -- get the drive path of the incoming path
39+ drive <- getVolumePathName path
40+ withTString drive $ \c_drive -> do
41+ foreign_flags <- mallocForeignPtrBytes 8
42+ withForeignPtr foreign_flags $ \ptr_fsFlags -> do
43+ failIfFalse_ (unwords ["GetVolumeInformationW", path]) (c_GetVolumeInformation c_drive nullPtr 0 nullPtr nullPtr ptr_fsFlags nullPtr 0)
44+ fsFlags <- peekByteOff ptr_fsFlags 0 :: IO Word64
45+ pure (fsFlags .&. FILE_SUPPORTS_USN_JOURNAL /= 0)
46+
47+#elif darwin_HOST_OS
48+import Foreign.C.Error
49+import Foreign.C.String
50+import Foreign.C.Types
51+
52+--Darwin reports journaling directly in the fs flags
53+
54+type CStatFS = ()
55+foreign import ccall unsafe "cDarwinFSJournaled"
56+ c_DarwinFSJournaled :: CString -> IO CInt
57+
58+fsTypeSupportsJournaling :: FilePath -> IO Bool
59+fsTypeSupportsJournaling path =
60+ withCString path $ \c_path -> do
61+ ret <- throwErrnoIfMinus1 "statfs" (c_DarwinFSJournaled c_path)
62+ pure (ret > (0 :: CInt))
63+
64+#elif linux_HOST_OS
65+import Foreign
66+import Foreign.C.Error
67+import Foreign.C.String
68+import Foreign.C.Types
69+
70+#include "MachDeps.h"
71+--Linux cannot report journaling, so we just check the filesystem type as a proxy
72+type CStatFS = ()
73+foreign import ccall unsafe "sys/vfs.h statfs"
74+ c_statfs :: CString -> Ptr CStatFS -> IO CInt
75+
76+#if WORD_SIZE_IN_BITS == 64
77+type CFSType = Word64
78+sizeofStructStatFS :: Int
79+sizeofStructStatFS = 120
80+#else
81+#error 32-bit not supported due to sizeof struct statfs missing
82+type CFSType = Word32
83+sizeofStructStatFS :: Int
84+sizeofStructStatFS = undefined
85+#endif
86+
87+fsTypeSupportsJournaling :: FilePath -> IO Bool
88+fsTypeSupportsJournaling path = do
89+ struct_statfs <- mallocForeignPtrBytes sizeofStructStatFS
90+ withCString path $ \c_path -> do
91+ withForeignPtr struct_statfs $ \ptr_statfs -> do
92+ throwErrnoIfMinus1_ "statfs" (c_statfs c_path ptr_statfs)
93+ cfstype <- peekByteOff ptr_statfs 0 :: IO CFSType
94+ let journaledFS = [0xEF53, --EXT3+4
95+ 0x5346544e, --NTFS
96+ 0x52654973, --REISERFS
97+ 0x58465342, --XFS
98+ 0x3153464a --JFS
99+ ]
100+ pure (elem cfstype journaledFS)
101+#endif
102+
src/lib/ProjectM36/FileLock.hsnew file+96
@@ -0,0 +1,96 @@
1+{-# LANGUAGE CPP #-}
2+--cross-platform file locking utilizing POSIX file locking on Unix/Linux and Windows file locking
3+--hackage's System.FileLock doesn't support POSIX advisory locks nor locking file based on file descriptors, hence this needless rewrite
4+module ProjectM36.FileLock where
5+
6+
7+#if defined(mingw32_HOST_OS)
8+import System.Win32.Types
9+import Foreign.Marshal.Alloc
10+import System.Win32.File
11+import System.Win32.Mem
12+import Data.Bits
13+
14+#if defined(i386_HOST_ARCH)
15+# define WINDOWS_CCONV stdcall
16+#elif defined(x86_64_HOST_ARCH)
17+# define WINDOWS_CCONV ccall
18+#else
19+# error Unknown mingw32 arch
20+#endif
21+foreign import WINDOWS_CCONV "LockFileEx" c_lockFileEx :: HANDLE -> DWORD -> DWORD -> DWORD -> DWORD -> LPOVERLAPPED -> IO BOOL
22+
23+foreign import WINDOWS_CCONV "UnlockFileEx" c_unlockFileEx :: HANDLE -> DWORD -> DWORD -> DWORD -> LPOVERLAPPED -> IO BOOL
24+
25+type LockFile = HANDLE
26+
27+openLockFile :: FilePath -> IO LockFile
28+openLockFile path = createFile path
29+ (gENERIC_READ .|. gENERIC_WRITE)
30+ (fILE_SHARE_READ .|. fILE_SHARE_WRITE)
31+ Nothing
32+ oPEN_ALWAYS
33+ fILE_ATTRIBUTE_NORMAL
34+ Nothing
35+
36+closeLockFile :: LockFile -> IO ()
37+closeLockFile file = do
38+ closeHandle file
39+
40+--swiped from System.FileLock package
41+lockFile :: HANDLE -> LockType -> IO ()
42+lockFile winHandle lock = do
43+ let exFlag = case lock of
44+ WriteLock -> 2
45+ ReadLock -> 0
46+ blockFlag = 0 --always block
47+ sizeof_OVERLAPPED = 32
48+
49+ allocaBytes sizeof_OVERLAPPED $ \op -> do
50+ zeroMemory op $ fromIntegral sizeof_OVERLAPPED
51+ failIfFalse_ "LockFileEx" $ c_lockFileEx winHandle (exFlag .|. blockFlag) 0 1 0 op
52+
53+unlockFile :: HANDLE -> IO ()
54+unlockFile winHandle = do
55+ let sizeof_OVERLAPPED = 32
56+ allocaBytes sizeof_OVERLAPPED $ \op -> do
57+ zeroMemory op $ fromIntegral sizeof_OVERLAPPED
58+ failIfFalse_ "UnlockFileEx" $ c_unlockFileEx winHandle 0 1 0 op
59+
60+#else
61+--all of this complicated nonsense is fixed if we switch to GHC 8.2 which includes native flock support on handles
62+import qualified System.Posix.IO as P
63+import System.Posix.Types
64+import System.Posix.Files
65+import System.IO
66+
67+lockStruct :: P.LockRequest -> P.FileLock
68+lockStruct req = (req, AbsoluteSeek, 0, 0)
69+
70+newtype LockFile = LockFile Fd
71+
72+--we cannot use openFile from System.IO because it implements complicated locking which prevents opening the same file twice in write mode in the same process with no way to bypass the check.
73+openLockFile :: FilePath -> IO LockFile
74+openLockFile path =
75+ LockFile <$> P.createFile path ownerWriteMode
76+
77+closeLockFile :: LockFile -> IO ()
78+closeLockFile (LockFile fd) =
79+ P.closeFd fd
80+
81+--blocks on lock, if necessary
82+lockFile :: LockFile -> LockType -> IO ()
83+lockFile (LockFile fd) lock = do
84+ let lockt = case lock of
85+ WriteLock -> P.WriteLock
86+ ReadLock -> P.ReadLock
87+ P.waitToSetLock fd (lockStruct lockt)
88+
89+unlockFile :: LockFile -> IO ()
90+unlockFile (LockFile fd) =
91+ P.waitToSetLock fd (lockStruct P.Unlock)
92+#endif
93+
94+data LockType = ReadLock | WriteLock deriving (Show)
95+
96+
src/lib/ProjectM36/FunctionalDependency.hsnew file+20
@@ -0,0 +1,20 @@
1+module ProjectM36.FunctionalDependency where
2+import ProjectM36.Base
3+import qualified Data.Set as S
4+
5+data FunctionalDependency = FunctionalDependency AttributeNames AttributeNames RelationalExpr
6+
7+--(s{city} group ({city} as x) : {z:=count(@x)}) {z}
8+-- as defined in Relational Algebra and All That Jazz page 21
9+inclusionDependenciesForFunctionalDependency :: FunctionalDependency -> (InclusionDependency, InclusionDependency)
10+inclusionDependenciesForFunctionalDependency (FunctionalDependency attrNamesSource attrNamesDependent relExpr) = (
11+ InclusionDependency countSource countDep,
12+ InclusionDependency countDep countSource)
13+ where
14+ countDep = relExprCount relExpr (UnionAttributeNames attrNamesSource attrNamesDependent)
15+ countSource = relExprCount relExpr attrNamesSource
16+ projectZName = Project (AttributeNames (S.singleton "z"))
17+ zCount = FunctionAtomExpr "count" [AttributeAtomExpr "x"] ()
18+ extendZName = Extend (AttributeExtendTupleExpr "z" zCount)
19+ relExprCount expr projectionAttrNames = projectZName (extendZName
20+ (Group projectionAttrNames "x" (Project projectionAttrNames expr)))
src/lib/ProjectM36/GraphRefRelationalExpr.hsnew file+45
@@ -0,0 +1,45 @@
1+module ProjectM36.GraphRefRelationalExpr where
2+--evaluate relational expressions across the entire transaction graph to support cross-transaction referencing
3+import ProjectM36.Base
4+import qualified Data.Set as S
5+
6+--import Debug.Trace
7+
8+data SingularTransactionRef = SingularTransactionRef GraphRefTransactionMarker |
9+ MultipleTransactionsRef |
10+ NoTransactionsRef
11+ deriving (Eq, Show)
12+
13+instance Semigroup SingularTransactionRef where
14+ NoTransactionsRef <> x = x
15+ MultipleTransactionsRef <> _ = MultipleTransactionsRef
16+ SingularTransactionRef tidA <> s@(SingularTransactionRef tidB) =
17+ if tidA == tidB then
18+ s
19+ else
20+ MultipleTransactionsRef
21+ s@SingularTransactionRef{} <> NoTransactionsRef = s
22+ _ <> MultipleTransactionsRef = MultipleTransactionsRef
23+
24+instance Monoid SingularTransactionRef where
25+ mempty = NoTransactionsRef
26+
27+-- | return `Just transid` if this GraphRefRelationalExpr refers to just one transaction in the graph. This is useful for determining if certain optimizations can apply.
28+singularTransaction :: Foldable t => t GraphRefTransactionMarker -> SingularTransactionRef
29+singularTransaction expr
30+ | S.null transSet = NoTransactionsRef
31+ | S.size transSet == 1 = SingularTransactionRef (head (S.toList transSet))
32+ | otherwise = MultipleTransactionsRef
33+ where
34+ transSet = foldr S.insert S.empty expr
35+
36+-- | Return True if two 'GraphRefRelationalExpr's both refer exclusively to the same transaction (or none at all).
37+inSameTransaction :: GraphRefRelationalExpr -> GraphRefRelationalExpr -> Maybe GraphRefTransactionMarker
38+inSameTransaction exprA exprB = case (stA, stB) of
39+ (SingularTransactionRef tA, SingularTransactionRef tB) | tA == tB -> Just tA
40+ _ -> Nothing
41+ where stA = singularTransaction exprA
42+ stB = singularTransaction exprB
43+
44+singularTransactions :: (Foldable f, Foldable t) => f (t GraphRefTransactionMarker) -> SingularTransactionRef
45+singularTransactions = foldMap singularTransaction
src/lib/ProjectM36/InclusionDependency.hsnew file+19
@@ -0,0 +1,19 @@
1+module ProjectM36.InclusionDependency where
2+import ProjectM36.Base
3+import ProjectM36.Attribute
4+import ProjectM36.Error
5+import ProjectM36.Relation
6+import qualified Data.Map as M
7+
8+inclusionDependenciesAsRelation :: InclusionDependencies -> Either RelationalError Relation
9+inclusionDependenciesAsRelation incDeps =
10+ mkRelationFromList attrs (map incDepAsAtoms (M.toList incDeps))
11+ where
12+ attrs = attributesFromList [Attribute "name" TextAtomType,
13+ Attribute "sub" RelationalExprAtomType,
14+ Attribute "super" RelationalExprAtomType
15+ ]
16+ incDepAsAtoms (name, InclusionDependency exprA exprB) = [TextAtom name,
17+ RelationalExprAtom exprA,
18+ RelationalExprAtom exprB]
19+
src/lib/ProjectM36/IsomorphicSchema.hsnew file+333
@@ -0,0 +1,333 @@
1+{-# LANGUAGE DeriveGeneric, LambdaCase, DerivingVia #-}
2+module ProjectM36.IsomorphicSchema where
3+import ProjectM36.Base
4+import ProjectM36.Error
5+import ProjectM36.MiscUtils
6+import ProjectM36.Relation
7+import ProjectM36.NormalizeExpr
8+import ProjectM36.RelationalExpression
9+import qualified ProjectM36.AttributeNames as AN
10+import Control.Monad
11+import GHC.Generics
12+import qualified Data.Map as M
13+import qualified Data.Set as S
14+import qualified Data.List as L
15+#if __GLASGOW_HASKELL__ < 804
16+import Data.Monoid
17+#endif
18+-- isomorphic schemas offer bi-directional functors between two schemas
19+
20+--TODO: note that renaming a relvar should alter any stored isomorphisms as well
21+--TODO: rel attrs rename or transform (needs bidirectional atom functions)
22+-- TODO: IsoRestrict should include requirement that union'd relations should retain the same tuple count (no tuples are lost or ambiguous between the two relations)
23+--TODO: allow morphs to stack (morph a schema to a new schema)
24+ -- this could be accomplished by morphing the morphs or by chain linking schemas so that they need not directly reference the underlying concrete schema
25+
26+-- the isomorphic building blocks should not be arbitrarily combined; for example, combing restrict and union on the same target relvar does not make sense as that would create effects at a distance in the secondary schema
27+
28+data SchemaExpr = AddSubschema SchemaName SchemaIsomorphs |
29+ RemoveSubschema SchemaName
30+ deriving (Generic, Show)
31+
32+isomorphs :: Schema -> SchemaIsomorphs
33+isomorphs (Schema i) = i
34+
35+-- | Return an error if the schema is not isomorphic to the base database context.
36+-- A schema is fully isomorphic iff all relvars in the base context are in the "out" relvars, but only once.
37+--TODO: add relvar must appear exactly once constraint
38+validateSchema :: Schema -> DatabaseContext -> Maybe SchemaError
39+validateSchema potentialSchema baseContext | not (S.null rvDiff) = Just (RelVarReferencesMissing rvDiff)
40+ | not (null outDupes) = Just (RelVarOutReferencedMoreThanOnce (head outDupes))
41+ | not (null inDupes) = Just (RelVarInReferencedMoreThanOnce (head inDupes))
42+ | otherwise = Nothing
43+ where
44+ --check that the predicate for IsoUnion and IsoRestrict holds right now
45+ outDupes = duplicateNames (namesList isomorphOutRelVarNames)
46+ inDupes = duplicateNames (namesList isomorphInRelVarNames)
47+ duplicateNames = dupes . L.sort
48+ namesList isoFunc = concatMap isoFunc (isomorphs potentialSchema)
49+ expectedRelVars = M.keysSet (relationVariables baseContext)
50+ schemaRelVars = isomorphsOutRelVarNames (isomorphs potentialSchema)
51+ rvDiff = S.difference expectedRelVars schemaRelVars
52+
53+-- useful for transforming a concrete context into a virtual schema and vice versa
54+invert :: SchemaIsomorph -> SchemaIsomorph
55+invert (IsoRename rvIn rvOut) = IsoRename rvOut rvIn
56+invert (IsoRestrict rvIn predi (rvAOut, rvBOut)) = IsoUnion (rvAOut, rvBOut) predi rvIn
57+invert (IsoUnion (rvAIn, rvBIn) predi rvOut) = IsoRestrict rvOut predi (rvAIn, rvBIn)
58+
59+isomorphInRelVarNames :: SchemaIsomorph -> [RelVarName]
60+isomorphInRelVarNames (IsoRestrict rv _ _) = [rv]
61+isomorphInRelVarNames (IsoUnion (rvA, rvB) _ _) = [rvA, rvB]
62+isomorphInRelVarNames (IsoRename rv _) = [rv]
63+
64+-- | Relation variables names represented in the virtual schema space. Useful for determining if a relvar name is valid in the schema.
65+isomorphsInRelVarNames :: SchemaIsomorphs -> S.Set RelVarName
66+isomorphsInRelVarNames morphs = S.fromList (foldr rvnames [] morphs)
67+ where
68+ rvnames morph acc = acc ++ isomorphInRelVarNames morph
69+
70+isomorphOutRelVarNames :: SchemaIsomorph -> [RelVarName]
71+isomorphOutRelVarNames (IsoRestrict _ _ (rvA, rvB)) = [rvA, rvB]
72+isomorphOutRelVarNames (IsoUnion _ _ rv) = [rv]
73+isomorphOutRelVarNames (IsoRename _ rv) = [rv]
74+
75+isomorphsOutRelVarNames :: SchemaIsomorphs -> S.Set RelVarName
76+isomorphsOutRelVarNames morphs = S.fromList (foldr rvnames [] morphs)
77+ where
78+ rvnames morph acc = acc ++ isomorphOutRelVarNames morph
79+
80+-- | Check that all mentioned relvars are actually present in the current schema.
81+validateRelationalExprInSchema :: Schema -> RelationalExpr -> Either RelationalError ()
82+validateRelationalExprInSchema schema relExprIn = relExprMogrify (\case
83+ RelationVariable rv () | S.notMember rv validRelVarNames -> Left (RelVarNotDefinedError rv)
84+ ex -> Right ex) relExprIn >> pure ()
85+ where
86+ validRelVarNames = isomorphsInRelVarNames (isomorphs schema)
87+
88+processRelationalExprInSchema :: Schema -> RelationalExpr -> Either RelationalError RelationalExpr
89+processRelationalExprInSchema schema relExprIn = do
90+ --validate that all rvs are present in the virtual schema- this prevents relation variables being referenced in the underlying schema (falling through the transformation)
91+ let processRelExpr rexpr morph = relExprMogrify (relExprMorph morph) rexpr
92+ validateRelationalExprInSchema schema relExprIn
93+ foldM processRelExpr relExprIn (isomorphs schema)
94+
95+validateDatabaseContextExprInSchema :: Schema -> DatabaseContextExpr -> Either RelationalError ()
96+validateDatabaseContextExprInSchema schema dbExpr = mapM_ (\morph -> databaseContextExprMorph morph (\e -> validateRelationalExprInSchema schema e >> pure e) dbExpr) (isomorphs schema) >> pure ()
97+
98+processDatabaseContextExprInSchema :: Schema -> DatabaseContextExpr -> Either RelationalError DatabaseContextExpr
99+processDatabaseContextExprInSchema schema@(Schema morphs) dbExpr = do
100+ let relExprMogrifier = processRelationalExprInSchema schema
101+ --validate that all mentioned relvars are in the valid set
102+ _ <- validateDatabaseContextExprInSchema schema dbExpr
103+ --perform the morph
104+ foldM (\ex morph -> databaseContextExprMorph morph relExprMogrifier ex) dbExpr morphs
105+
106+-- | If the database context expression adds or removes a relvar, we need to update the isomorphs to create a passthrough Isomorph.
107+processDatabaseContextExprSchemaUpdate :: Schema -> DatabaseContextExpr -> Schema
108+processDatabaseContextExprSchemaUpdate schema@(Schema morphs) expr = case expr of
109+ Define rv _ | S.notMember rv validSchemaName -> passthru rv
110+ Assign rv _ | S.notMember rv validSchemaName -> passthru rv
111+ Undefine rv | S.member rv validSchemaName -> Schema (filter (elem rv . isomorphInRelVarNames) morphs)
112+ MultipleExpr exprs -> foldr (flip processDatabaseContextExprSchemaUpdate) schema exprs
113+ _ -> schema
114+ where
115+ validSchemaName = isomorphsInRelVarNames morphs
116+ passthru rvname = Schema (morphs ++ [IsoRename rvname rvname])
117+
118+processDatabaseContextExprSchemasUpdate :: Subschemas -> DatabaseContextExpr -> Subschemas
119+processDatabaseContextExprSchemasUpdate subschemas expr = M.map (`processDatabaseContextExprSchemaUpdate` expr) subschemas
120+
121+-- re-evaluate- it's not possible to display an incdep that may be for a foreign key to a relvar which is not available in the subschema!
122+-- weird compromise: allow inclusion dependencies failures not in the subschema to be propagated- in the worst case, only the inclusion dependency's name is leaked.
123+ {-
124+-- | Convert inclusion dependencies for display in a specific schema.
125+applySchemaToInclusionDependencies :: Schema -> InclusionDependencies -> Either RelationalError InclusionDependencies
126+applySchemaToInclusionDependencies (Schema morphs) incDeps =
127+ let incDepMorph incDep = --check that the mentioned relvars are in fact in the current schema
128+ M.update incDepMorph incDeps
129+ -}
130+
131+-- | Morph a relational expression in one schema to another isomorphic schema.
132+relExprMorph :: SchemaIsomorph -> (RelationalExpr -> Either RelationalError RelationalExpr)
133+relExprMorph (IsoRestrict relIn _ (relOutTrue, relOutFalse)) = \case
134+ RelationVariable rv () | rv == relIn -> Right (Union (RelationVariable relOutTrue ()) (RelationVariable relOutFalse ()))
135+ orig -> Right orig
136+relExprMorph (IsoUnion (relInT, relInF) predi relTarget) = \case
137+ --only the true predicate portion appears in the virtual schema
138+ RelationVariable rv () | rv == relInT -> Right (Restrict predi (RelationVariable relTarget ()))
139+
140+ RelationVariable rv () | rv == relInF -> Right (Restrict (NotPredicate predi) (RelationVariable relTarget ()))
141+ orig -> Right orig
142+relExprMorph (IsoRename relIn relOut) = \case
143+ RelationVariable rv () | rv == relIn -> Right (RelationVariable relOut ())
144+ orig -> Right orig
145+
146+relExprMogrify :: (RelationalExpr -> Either RelationalError RelationalExpr) -> RelationalExpr -> Either RelationalError RelationalExpr
147+relExprMogrify func (Project attrs expr) = func expr >>= \ex -> func (Project attrs ex)
148+relExprMogrify func (Union exprA exprB) = do
149+ exA <- func exprA
150+ exB <- func exprB
151+ func (Union exA exB)
152+relExprMogrify func (Join exprA exprB) = do
153+ exA <- func exprA
154+ exB <- func exprB
155+ func (Join exA exB)
156+relExprMogrify func (Rename n1 n2 expr) = func expr >>= \ex -> func (Rename n1 n2 ex)
157+relExprMogrify func (Difference exprA exprB) = do
158+ exA <- func exprA
159+ exB <- func exprB
160+ func (Difference exA exB)
161+relExprMogrify func (Group ns n expr) = func expr >>= \ex -> func (Group ns n ex)
162+relExprMogrify func (Ungroup n expr) = func expr >>= \ex -> func (Ungroup n ex)
163+relExprMogrify func (Restrict predi expr) = func expr >>= \ex -> func (Restrict predi ex)
164+relExprMogrify func (Equals exprA exprB) = do
165+ exA <- func exprA
166+ exB <- func exprB
167+ func (Equals exA exB)
168+relExprMogrify func (NotEquals exprA exprB) = do
169+ exA <- func exprA
170+ exB <- func exprB
171+ func (NotEquals exA exB)
172+relExprMogrify func (Extend ext expr) = func expr >>= \ex -> func (Extend ext ex)
173+relExprMogrify func other = func other
174+
175+{-
176+spam :: Either RelationalError RelationalExpr
177+spam = relExprMogrify (relExprMorph (IsoRestrict "emp" TruePredicate (Just "nonboss", Just "boss"))) (RelationVariable "emp" ())
178+
179+spam2 :: Either RelationalError RelationalExpr
180+spam2 = relExprMogrify (relExprMorph (IsoUnion ("boss", Just "nonboss") TruePredicate "emp")) (RelationVariable "boss" ())
181+-}
182+
183+databaseContextExprMorph :: SchemaIsomorph -> (RelationalExpr -> Either RelationalError RelationalExpr) -> DatabaseContextExpr -> Either RelationalError DatabaseContextExpr
184+databaseContextExprMorph iso@(IsoRestrict rvIn filt (rvTrue, rvFalse)) relExprFunc expr = case expr of
185+ Assign rv relExpr | rv == rvIn -> do
186+ ex <- relExprFunc relExpr
187+ let trueExpr n = Assign n (Restrict filt ex)
188+ falseExpr n = Assign n (Restrict (NotPredicate filt) ex)
189+ pure $ MultipleExpr [trueExpr rvTrue, falseExpr rvFalse]
190+ Insert rv relExpr | rv == rvIn -> do
191+ ex <- relExprFunc relExpr
192+ let trueExpr n = Insert n (Restrict filt ex)
193+ falseExpr n = Insert n (Restrict (NotPredicate filt) ex)
194+ pure $ MultipleExpr [trueExpr rvTrue, falseExpr rvFalse]
195+ Update rv attrMap predi | rv == rvIn -> do
196+ -- if the update would "shift" a tuple from the true->false relvar or vice versa, that would be a constraint violation in the virtual schema
197+ let trueExpr n = Update n attrMap (AndPredicate predi filt)
198+ falseExpr n = Update n attrMap (AndPredicate predi (NotPredicate filt))
199+ pure (MultipleExpr [trueExpr rvTrue, falseExpr rvFalse])
200+ MultipleExpr exprs -> MultipleExpr <$> mapM (databaseContextExprMorph iso relExprFunc) exprs
201+ orig -> pure orig
202+databaseContextExprMorph iso@(IsoUnion (rvTrue, rvFalse) filt rvOut) relExprFunc expr = case expr of
203+ --assign: replace all instances in the portion of the target relvar with the new tuples from the relExpr
204+ --problem: between the delete->insert, constraints could be violated which would not otherwise be violated in the "in" schema. This implies that there should be a combo operator which can insert/update/delete in a single pass based on relexpr queries, or perhaps MultipleExpr should be the infamous "comma" operator from TutorialD?
205+ -- if any tuples are filtered out of the insert/assign, we need to simulate a constraint violation
206+ Assign rv relExpr | rv == rvTrue -> relExprFunc relExpr >>= \ex -> pure $ MultipleExpr [Delete rvOut filt,
207+ Insert rvOut (Restrict filt ex)]
208+ Assign rv relExpr | rv == rvFalse -> relExprFunc relExpr >>= \ex -> pure $ MultipleExpr [Delete rvOut (NotPredicate filt),
209+ Insert rvOut (Restrict (NotPredicate filt) ex)]
210+ Insert rv relExpr | rv == rvTrue || rv == rvFalse -> relExprFunc relExpr >>= \ex -> pure $ Insert rvOut ex
211+ Delete rv delPred | rv == rvTrue -> pure $ Delete rvOut (AndPredicate delPred filt)
212+ Delete rv delPred | rv == rvFalse -> pure $ Delete rvOut (AndPredicate delPred (NotPredicate filt))
213+ Update rv attrMap predi | rv == rvTrue -> pure $ Update rvOut attrMap (AndPredicate predi filt)
214+ Update rv attrMap predi | rv == rvFalse -> pure $ Update rvOut attrMap (AndPredicate (NotPredicate filt) predi)
215+ MultipleExpr exprs -> MultipleExpr <$> mapM (databaseContextExprMorph iso relExprFunc) exprs
216+ orig -> pure orig
217+databaseContextExprMorph iso@(IsoRename relIn relOut) relExprFunc expr = case expr of
218+ Assign rv relExpr | rv == relIn -> relExprFunc relExpr >>= \ex -> pure (Assign relOut ex)
219+ Insert rv relExpr | rv == relIn -> relExprFunc relExpr >>= \ex -> pure $ Insert relOut ex
220+ Delete rv delPred | rv == relIn -> pure $ Delete relOut delPred
221+ Update rv attrMap predi | rv == relIn -> pure $ Update relOut attrMap predi
222+ MultipleExpr exprs -> MultipleExpr <$> mapM (databaseContextExprMorph iso relExprFunc) exprs
223+ orig -> pure orig
224+
225+-- | Apply the isomorphism transformations to the relational expression to convert the relational expression from operating on one schema to a disparate, isomorphic schema.
226+applyRelationalExprSchemaIsomorphs :: SchemaIsomorphs -> RelationalExpr -> Either RelationalError RelationalExpr
227+applyRelationalExprSchemaIsomorphs morphs expr = foldM (\expr' morph -> relExprMogrify (relExprMorph morph) expr') expr morphs
228+
229+-- the morph must be applied in the opposite direction
230+--algorithm: create a relexpr for each relvar in the schema, then replace those rel exprs wherever they appear in the inc dep relexprs
231+-- x = x1 union x2
232+inclusionDependencyInSchema :: Schema -> InclusionDependency -> Either RelationalError InclusionDependency
233+inclusionDependencyInSchema schema (InclusionDependency rexprA rexprB) = do
234+ --collect all relvars which appear in the schema
235+ let schemaRelVars = isomorphsInRelVarNames (isomorphs schema)
236+ rvAssoc <- mapM (\rvIn -> do
237+ rvOut <- processRelationalExprInSchema schema (RelationVariable rvIn ())
238+ pure (rvOut, RelationVariable rvIn ())
239+ )
240+ (S.toList schemaRelVars)
241+ let replacer exprOrig = foldM (\expr (find, replace) -> if expr == find then
242+ pure replace
243+ else
244+ pure expr) exprOrig rvAssoc
245+ rexprA' <- relExprMogrify replacer rexprA
246+ rexprB' <- relExprMogrify replacer rexprB
247+ pure (InclusionDependency rexprA' rexprB')
248+
249+-- #55 add two virtual constraints for IsoUnion and enforce them before the tuples disappear
250+-- this is needed to
251+-- also, it's inverse to IsoRestrict which adds two constraints at the base level
252+-- for IsoRestrict, consider hiding the two, generated constraints since they can never be thrown in the isomorphic schema
253+inclusionDependenciesInSchema :: Schema -> InclusionDependencies -> Either RelationalError InclusionDependencies
254+inclusionDependenciesInSchema schema incDeps = M.fromList <$> mapM (\(depName, dep) -> inclusionDependencyInSchema schema dep >>= \newDep -> pure (depName, newDep)) (M.toList incDeps)
255+
256+relationVariablesInSchema :: Schema -> Either RelationalError RelationVariables
257+relationVariablesInSchema schema@(Schema morphs) = foldM transform M.empty morphs
258+ where
259+ transform newRvMap morph = do
260+ let rvNames = isomorphInRelVarNames morph
261+ rvAssocs <- mapM (\rv -> do
262+ expr' <- processRelationalExprInSchema schema (RelationVariable rv ())
263+ let gfExpr = runProcessExprM UncommittedContextMarker (processRelationalExpr expr')
264+ pure (rv, gfExpr)) rvNames
265+ pure (M.union newRvMap (M.fromList rvAssocs))
266+
267+
268+
269+{-
270+proposal
271+data DatabaseContext =
272+Concrete ...|
273+Virtual Isomorphs
274+-}
275+
276+applyRelationVariablesSchemaIsomorphs :: SchemaIsomorphs -> RelationVariables -> Either RelationalError RelationVariables
277+applyRelationVariablesSchemaIsomorphs = undefined
278+
279+
280+applySchemaIsomorphsToDatabaseContext :: SchemaIsomorphs -> DatabaseContext -> Either RelationalError DatabaseContext
281+applySchemaIsomorphsToDatabaseContext morphs context = do
282+-- incdeps <- inclusionDependen morphs (inclusionDependencies context)
283+ relvars <- applyRelationVariablesSchemaIsomorphs morphs (relationVariables context)
284+ pure (context { --inclusionDependencies = incdeps,
285+ relationVariables = relvars
286+ --atomFunctions = atomfuncs,
287+ --notifications = notifs,
288+ --typeConstructorMapping = tconsmapping
289+ })
290+
291+{-
292+validate :: SchemaIsomorph -> S.Set RelVarName -> Either RelationalError SchemaIsomorph
293+validate morph underlyingRvNames = if S.size invalidRvNames > 0 then
294+ Left (MultipleErrors (map RelVarNotDefinedError (S.toList invalidRvNames)))
295+ else
296+ Right morph
297+ where
298+ morphRvNames = S.fromList (isomorphOutRelVarNames morph)
299+ invalidRvNames = S.difference morphRvNames underlyingRvNames
300+-}
301+
302+-- | Create inclusion dependencies mainly for IsoRestrict because the predicate should hold in the base schema.
303+createIncDepsForIsomorph :: SchemaName -> SchemaIsomorph -> InclusionDependencies
304+createIncDepsForIsomorph sname (IsoRestrict origRv predi (rvTrue, rvFalse)) = let
305+ newIncDep predicate rv = InclusionDependency (Project AN.empty (Restrict predicate (RelationVariable rv ()))) (ExistingRelation relationTrue)
306+ incDepName b = "schema" <> "_" <> sname <> "_" <> b in
307+ M.fromList [(incDepName (origRv <> "_true"), newIncDep predi rvTrue),
308+ (incDepName (origRv <> "_false"), newIncDep (NotPredicate predi) rvFalse)]
309+createIncDepsForIsomorph _ _ = M.empty
310+
311+-- in the case of IsoRestrict, the database context should be updated with the restriction so that if the restriction does not hold, then the schema cannot be created
312+evalSchemaExpr :: SchemaExpr -> DatabaseContext -> TransactionId -> TransactionGraph -> Subschemas -> Either RelationalError (Subschemas, DatabaseContext)
313+evalSchemaExpr (AddSubschema sname morphs) context transId graph sschemas =
314+ if M.member sname sschemas then
315+ Left (SubschemaNameInUseError sname)
316+ else
317+ case validateSchema (Schema morphs) context of
318+ Just err -> Left (SchemaCreationError err)
319+ Nothing -> do
320+ let newSchemas = M.insert sname newSchema sschemas
321+ newSchema = Schema morphs
322+ moreIncDeps = foldr (\morph acc -> M.union acc (createIncDepsForIsomorph sname morph)) M.empty morphs
323+ incDepExprs = MultipleExpr (map (uncurry AddInclusionDependency) (M.toList moreIncDeps))
324+ dbenv = mkDatabaseContextEvalEnv transId graph
325+ dbstate <- runDatabaseContextEvalMonad context dbenv (evalGraphRefDatabaseContextExpr incDepExprs)
326+ pure (newSchemas, dbc_context dbstate)
327+--need to propagate dirty flag here
328+
329+evalSchemaExpr (RemoveSubschema sname) context _ _ sschemas = if M.member sname sschemas then
330+ pure (M.delete sname sschemas, context)
331+ else
332+ Left (SubschemaNameNotInUseError sname)
333+
src/lib/ProjectM36/Key.hs+40−3
@@ -2,6 +2,9 @@ module ProjectM36.Key where
22import ProjectM36.Base
33import ProjectM36.Relation
44import qualified Data.Set as S
5+#if __GLASGOW_HASKELL__ < 804
6+import Data.Monoid
7+#endif
58
69{-
710keys can be implemented using inclusion dependencies as well: the count of the projection of the keys' attributes must be equal to the count of the tuples- p. 120 Database in Depth
@@ -20,13 +23,47 @@ example:
2023│5│
2124└─┘
2225-}
26+
27+-- | Create a uniqueness constraint for the attribute names and relational expression. Note that constraint can span multiple relation variables.
2328inclusionDependencyForKey :: AttributeNames -> RelationalExpr -> InclusionDependency
2429inclusionDependencyForKey attrNames relExpr = --InclusionDependency name (exprCount relExpr) (exprCount (projectedOnKeys relExpr))
2530 InclusionDependency equalityExpr (ExistingRelation relationFalse)
2631 where
27− projectedOnKeys expr = Project attrNames expr
32+ projectedOnKeys = Project attrNames
2833 exprAsSubRelation expr = Extend (AttributeExtendTupleExpr "a" (RelationAtomExpr expr)) (ExistingRelation relationTrue)
29− exprCount expr = projectionForCount (Extend (AttributeExtendTupleExpr "b" (FunctionAtomExpr "count" [AttributeAtomExpr "a"])) (exprAsSubRelation expr))
30− projectionForCount expr = Project (AttributeNames $ S.fromList ["b"]) expr
34+ exprCount expr = projectionForCount (Extend (AttributeExtendTupleExpr "b" (FunctionAtomExpr "count" [AttributeAtomExpr "a"] () )) (exprAsSubRelation expr))
35+ projectionForCount = Project (AttributeNames $ S.fromList ["b"])
3136 equalityExpr = NotEquals (exprCount relExpr) (exprCount (projectedOnKeys relExpr))
3237
38+-- | Create a 'DatabaseContextExpr' which can be used to add a uniqueness constraint to attributes on one relation variable.
39+databaseContextExprForUniqueKey :: RelVarName -> [AttributeName] -> DatabaseContextExpr
40+databaseContextExprForUniqueKey rvName attrNames = AddInclusionDependency (rvName <> "_key") $ inclusionDependencyForKey (AttributeNames (S.fromList attrNames)) (RelationVariable rvName ())
41+
42+-- | Create a foreign key constraint from the first relation variable and attributes to the second.
43+databaseContextExprForForeignKey :: IncDepName -> (RelVarName, [AttributeName]) -> (RelVarName, [AttributeName]) -> DatabaseContextExpr
44+databaseContextExprForForeignKey fkName infoA infoB =
45+ AddInclusionDependency fkName (inclusionDependencyForForeignKey infoA infoB)
46+
47+inclusionDependencyForForeignKey :: (RelVarName, [AttributeName]) -> (RelVarName, [AttributeName]) -> InclusionDependency
48+inclusionDependencyForForeignKey (rvA, attrsA) (rvB, attrsB) =
49+ InclusionDependency (
50+ renameIfNecessary attrsB attrsA (Project (attrsL attrsA)
51+ (RelationVariable rvA ()))) (
52+ Project (attrsL attrsB) (RelationVariable rvB ()))
53+ where
54+ attrsL = AttributeNames . S.fromList
55+ renameIfNecessary attrsExpected attrsExisting expr = foldr folder expr (zip attrsExpected attrsExisting)
56+ folder (attrExpected, attrExisting) expr = if attrExpected == attrExisting then
57+ expr
58+ else
59+ Rename attrExisting attrExpected expr
60+
61+-- if the constraint is a foreign key constraint, then return the relations and attributes involved - this only detects foreign keys created with `databaseContextExprForForeignKey`
62+isForeignKeyFor :: InclusionDependency -> (RelVarName, [AttributeName]) -> (RelVarName, [AttributeName]) -> Bool
63+isForeignKeyFor incDep infoA infoB = incDep == checkIncDep
64+ where
65+ checkIncDep = inclusionDependencyForForeignKey infoA infoB
66+
67+
68+
69+
src/lib/ProjectM36/MerkleHash.hsnew file+9
@@ -0,0 +1,9 @@
1+{-# LANGUAGE GeneralizedNewtypeDeriving, DeriveGeneric, DerivingVia #-}
2+module ProjectM36.MerkleHash where
3+import Data.ByteString (ByteString)
4+import GHC.Generics
5+import Control.DeepSeq (NFData)
6+
7+newtype MerkleHash = MerkleHash { _unMerkleHash :: ByteString }
8+ deriving (Show, Eq, Generic, Monoid, Semigroup, NFData)
9+
src/lib/ProjectM36/MiscUtils.hs+10−3
@@ -3,6 +3,13 @@ module ProjectM36.MiscUtils where
33--returns duplicates of a pre-sorted list
44dupes :: Eq a => [a] -> [a]
55dupes [] = []
6−dupes (_:[]) = []
7−dupes (x:y:[]) = if x == y then [x] else []
8−dupes (x:y:xs) = dupes(x:[y]) ++ dupes(xs)
6+dupes [_] = []
7+dupes [x,y] = [x | x == y]
8+dupes (x:y:xs) = dupes(x:[y]) ++ dupes(y : xs)
9+
10+--Data.Vector.indexed but for lists
11+indexed :: [a] -> [(Int, a)]
12+indexed = go 0
13+ where
14+ go _ [] = []
15+ go i (v:ys) = (i,v):go (i+1) ys
src/lib/ProjectM36/NormalizeExpr.hsnew file+132
@@ -0,0 +1,132 @@
1+-- | Functions to convert all types of expresions into their GraphRef- equivalents.
2+module ProjectM36.NormalizeExpr where
3+import ProjectM36.Base
4+import Control.Monad.Trans.Reader as R
5+import qualified Data.Map as M
6+
7+--used to process/normalize exprs to their respective graph ref forms
8+type ProcessExprM a = Reader GraphRefTransactionMarker a
9+
10+type CurrentTransactionId = TransactionId
11+
12+runProcessExprM :: GraphRefTransactionMarker -> ProcessExprM a -> a
13+runProcessExprM mtid m = runReader m mtid
14+
15+askMarker :: ProcessExprM GraphRefTransactionMarker
16+askMarker = R.ask
17+
18+-- convert a RelationalExpr into a GraphRefRelationalExpr using the current trans Id
19+processRelationalExpr :: RelationalExpr -> ProcessExprM GraphRefRelationalExpr
20+processRelationalExpr (MakeRelationFromExprs mAttrs tupleExprs) = do
21+ mAttrs' <- case mAttrs of
22+ Nothing -> pure Nothing
23+ Just mAttrs'' -> Just <$> mapM processAttributeExpr mAttrs''
24+ MakeRelationFromExprs mAttrs' <$> processTupleExprs tupleExprs
25+processRelationalExpr (MakeStaticRelation attrs tupSet) = pure (MakeStaticRelation attrs tupSet)
26+processRelationalExpr (ExistingRelation rel) = pure (ExistingRelation rel)
27+--requires current trans id and graph
28+processRelationalExpr (RelationVariable rv ()) = RelationVariable rv <$> askMarker
29+processRelationalExpr (Project attrNames expr) = Project <$> processAttributeNames attrNames <*> processRelationalExpr expr
30+processRelationalExpr (Union exprA exprB) = Union <$> processRelationalExpr exprA <*> processRelationalExpr exprB
31+processRelationalExpr (Join exprA exprB) = Join <$> processRelationalExpr exprA <*> processRelationalExpr exprB
32+processRelationalExpr (Rename attrA attrB expr) =
33+ Rename attrA attrB <$> processRelationalExpr expr
34+processRelationalExpr (Difference exprA exprB) = Difference <$> processRelationalExpr exprA <*> processRelationalExpr exprB
35+processRelationalExpr (Group attrNames attrName expr) = Group <$> processAttributeNames attrNames <*> pure attrName <*> processRelationalExpr expr
36+processRelationalExpr (Ungroup attrName expr) = Ungroup attrName <$> processRelationalExpr expr
37+processRelationalExpr (Restrict pred' expr) = Restrict <$> processRestrictionPredicateExpr pred' <*> processRelationalExpr expr
38+processRelationalExpr (Equals exprA exprB) =
39+ Equals <$> processRelationalExpr exprA <*> processRelationalExpr exprB
40+processRelationalExpr (NotEquals exprA exprB) =
41+ NotEquals <$> processRelationalExpr exprA <*> processRelationalExpr exprB
42+processRelationalExpr (Extend extendExpr expr) =
43+ Extend <$> processExtendTupleExpr extendExpr <*> processRelationalExpr expr
44+processRelationalExpr (With macros expr) =
45+ With <$> mapM (\(wnexpr, macroExpr) -> (,) <$> processWithNameExpr wnexpr <*> processRelationalExpr macroExpr) macros <*> processRelationalExpr expr
46+
47+processWithNameExpr :: WithNameExpr -> ProcessExprM GraphRefWithNameExpr
48+processWithNameExpr (WithNameExpr rvname ()) =
49+ WithNameExpr rvname <$> askMarker
50+
51+processAttributeNames :: AttributeNames -> ProcessExprM GraphRefAttributeNames
52+processAttributeNames (AttributeNames nameSet) = pure $ AttributeNames nameSet
53+processAttributeNames (InvertedAttributeNames attrNameSet) =
54+ pure $ InvertedAttributeNames attrNameSet
55+processAttributeNames (UnionAttributeNames attrNamesA attrNamesB) = UnionAttributeNames <$> processAttributeNames attrNamesA <*> processAttributeNames attrNamesB
56+processAttributeNames (IntersectAttributeNames attrNamesA attrNamesB) = IntersectAttributeNames <$> processAttributeNames attrNamesA <*> processAttributeNames attrNamesB
57+processAttributeNames (RelationalExprAttributeNames expr) = RelationalExprAttributeNames <$> processRelationalExpr expr
58+
59+processDatabaseContextExpr :: DatabaseContextExpr -> ProcessExprM GraphRefDatabaseContextExpr
60+processDatabaseContextExpr expr =
61+ case expr of
62+ NoOperation -> pure NoOperation
63+ Define nam attrExprs -> Define nam <$> mapM processAttributeExpr attrExprs
64+ Undefine nam -> pure (Undefine nam)
65+ Assign nam rexpr -> Assign nam <$> processRelationalExpr rexpr
66+ Insert nam rexpr -> Insert nam <$> processRelationalExpr rexpr
67+ Delete nam pred' -> Delete nam <$> processRestrictionPredicateExpr pred'
68+ Update nam attrMap pred' -> Update nam attrMap <$> processRestrictionPredicateExpr pred'
69+
70+ AddInclusionDependency nam dep -> pure (AddInclusionDependency nam dep)
71+ RemoveInclusionDependency nam -> pure (RemoveInclusionDependency nam)
72+ AddNotification nam exprA exprB exprC -> pure (AddNotification nam exprA exprB exprC)
73+ RemoveNotification nam -> pure (RemoveNotification nam)
74+ AddTypeConstructor tyDef consDefs -> pure (AddTypeConstructor tyDef consDefs)
75+ RemoveTypeConstructor tyName -> pure (RemoveTypeConstructor tyName)
76+
77+ RemoveAtomFunction aFuncName -> pure (RemoveAtomFunction aFuncName)
78+ RemoveDatabaseContextFunction funcName -> pure (RemoveDatabaseContextFunction funcName)
79+ ExecuteDatabaseContextFunction funcName atomExprs -> ExecuteDatabaseContextFunction funcName <$> mapM processAtomExpr atomExprs
80+ MultipleExpr exprs -> MultipleExpr <$> mapM processDatabaseContextExpr exprs
81+
82+processDatabaseContextIOExpr :: DatabaseContextIOExpr -> ProcessExprM GraphRefDatabaseContextIOExpr
83+processDatabaseContextIOExpr (AddAtomFunction f tcs sc) =
84+ pure (AddAtomFunction f tcs sc)
85+processDatabaseContextIOExpr (LoadAtomFunctions mod' fun file) =
86+ pure (LoadAtomFunctions mod' fun file)
87+processDatabaseContextIOExpr (AddDatabaseContextFunction mod' fun path) =
88+ pure (AddDatabaseContextFunction mod' fun path)
89+processDatabaseContextIOExpr (LoadDatabaseContextFunctions mod' fun path) =
90+ pure (LoadDatabaseContextFunctions mod' fun path)
91+processDatabaseContextIOExpr (CreateArbitraryRelation rvName attrExprs range) =
92+ CreateArbitraryRelation rvName <$> mapM processAttributeExpr attrExprs <*> pure range
93+
94+processRestrictionPredicateExpr :: RestrictionPredicateExpr -> ProcessExprM GraphRefRestrictionPredicateExpr
95+processRestrictionPredicateExpr TruePredicate = pure TruePredicate
96+processRestrictionPredicateExpr (AndPredicate a b) = AndPredicate <$> processRestrictionPredicateExpr a <*> processRestrictionPredicateExpr b
97+processRestrictionPredicateExpr (OrPredicate a b) = OrPredicate <$> processRestrictionPredicateExpr a <*> processRestrictionPredicateExpr b
98+processRestrictionPredicateExpr (NotPredicate a) = NotPredicate <$> processRestrictionPredicateExpr a
99+processRestrictionPredicateExpr (RelationalExprPredicate expr) =
100+ RelationalExprPredicate <$> processRelationalExpr expr
101+processRestrictionPredicateExpr (AtomExprPredicate expr) =
102+ AtomExprPredicate <$> processAtomExpr expr
103+processRestrictionPredicateExpr (AttributeEqualityPredicate nam expr) =
104+ AttributeEqualityPredicate nam <$> processAtomExpr expr
105+
106+processExtendTupleExpr :: ExtendTupleExpr -> ProcessExprM GraphRefExtendTupleExpr
107+processExtendTupleExpr (AttributeExtendTupleExpr nam atomExpr) =
108+ AttributeExtendTupleExpr nam <$> processAtomExpr atomExpr
109+
110+processAtomExpr :: AtomExpr -> ProcessExprM GraphRefAtomExpr
111+processAtomExpr (AttributeAtomExpr nam) = pure $ AttributeAtomExpr nam
112+processAtomExpr (NakedAtomExpr atom) = pure $ NakedAtomExpr atom
113+processAtomExpr (FunctionAtomExpr fName atomExprs ()) =
114+ FunctionAtomExpr fName <$> mapM processAtomExpr atomExprs <*> askMarker
115+processAtomExpr (RelationAtomExpr expr) = RelationAtomExpr <$> processRelationalExpr expr
116+processAtomExpr (ConstructedAtomExpr dConsName atomExprs ()) = ConstructedAtomExpr dConsName <$> mapM processAtomExpr atomExprs <*> askMarker
117+
118+processTupleExprs :: TupleExprs -> ProcessExprM GraphRefTupleExprs
119+processTupleExprs (TupleExprs () tupleExprs) = do
120+ marker <- askMarker
121+ TupleExprs marker <$> mapM processTupleExpr tupleExprs
122+
123+processTupleExpr :: TupleExpr -> ProcessExprM GraphRefTupleExpr
124+processTupleExpr (TupleExpr tMap) =
125+ TupleExpr . M.fromList <$> mapM (\(k,v) -> (,) k <$> processAtomExpr v) (M.toList tMap)
126+
127+--convert AttributeExpr to GraphRefAttributeExpr
128+processAttributeExpr :: AttributeExpr -> ProcessExprM GraphRefAttributeExpr
129+processAttributeExpr (AttributeAndTypeNameExpr nam tCons ()) =
130+ AttributeAndTypeNameExpr nam tCons <$> askMarker
131+processAttributeExpr (NakedAttributeExpr attr) = pure $ NakedAttributeExpr attr
132+
src/lib/ProjectM36/Notifications.hs+12−7
@@ -1,17 +1,22 @@
11module ProjectM36.Notifications where
22import ProjectM36.Base
3+import ProjectM36.Error
34import ProjectM36.RelationalExpression
4−import Control.Monad.State
5+import ProjectM36.StaticOptimizer
56import qualified Data.Map as M
67import Data.Either (isRight)
78
89-- | Returns the notifications which should be triggered based on the transition from the first 'DatabaseContext' to the second 'DatabaseContext'.
9−notificationChanges :: Notifications -> DatabaseContext -> DatabaseContext -> Notifications
10−notificationChanges nots context1 context2 = M.filter notificationFilter nots
10+notificationChanges :: Notifications -> TransactionGraph -> DatabaseContext -> DatabaseContext -> Notifications
11+notificationChanges nots graph context1 context2 = M.filter notificationFilter nots
1112 where
12− notificationFilter (Notification chExpr _) = let oldChangeEval = evalChangeExpr chExpr context1
13− newChangeEval = evalChangeExpr chExpr context2 in
14− oldChangeEval /= newChangeEval && isRight oldChangeEval
15− evalChangeExpr chExpr = evalState (evalRelationalExpr chExpr)
13+ notificationFilter (Notification chExpr _ _) = oldChangeEval /= newChangeEval && isRight oldChangeEval
14+ where
15+ oldChangeEval = evalChangeExpr chExpr (mkRelationalExprEnv context1 graph)
16+ newChangeEval = evalChangeExpr chExpr (mkRelationalExprEnv context2 graph)
17+
18+ evalChangeExpr :: RelationalExpr -> RelationalExprEnv -> Either RelationalError Relation
19+ evalChangeExpr chExpr env =
20+ optimizeAndEvalRelationalExpr env chExpr
1621
1722
src/lib/ProjectM36/Persist.hs+71−13
@@ -2,21 +2,42 @@
22--this module is related to persisting Project:M36 structures to disk and not related to the persistent library
33module ProjectM36.Persist (writeFileSync,
44 writeBSFileSync,
5− renameSync,
5+ renameSync,
6+ printFdCount,
67 DiskSync(..)) where
78-- on Windows, use FlushFileBuffers and MoveFileEx
9+import qualified Data.Text as T
10+
11+#if defined(linux_HOST_OS)
12+# define FDCOUNTSUPPORTED 1
13+# define FDDIR "/proc/self/fd"
14+#elif defined(darwin_HOST_OS)
15+# define FDCOUNTSUPPORTED 1
16+# define FDDIR "/dev/fd"
17+#else
18+# define FDCOUNTSUPPORTED 0
19+#endif
20+
21+#if FDCOUNTSUPPORTED
22+import System.Directory
23+#endif
824
925#if defined(mingw32_HOST_OS)
1026import qualified System.Win32 as Win32
1127#else
1228import qualified System.Posix as Posix
29+#if defined(linux_HOST_OS)
1330import System.Posix.Unistd (fileSynchroniseDataOnly)
14−import System.Posix.IO (handleToFd)
31+#else
32+import System.Posix.Unistd (fileSynchronise)
33+#endif
34+import System.Posix.IO (handleToFd, closeFd)
1535import Foreign.C
1636#endif
1737
18−import System.IO (withFile, IOMode(WriteMode), hPutStr, Handle)
19−import qualified Data.ByteString.Lazy as BS
38+import System.IO (withFile, IOMode(WriteMode), Handle)
39+import qualified Data.ByteString as BS'
40+import qualified Data.Text.Encoding as TE
2041
2142#if defined(mingw32_HOST_OS)
2243import ProjectM36.Win32Handle
@@ -26,11 +47,12 @@ foreign import ccall unsafe "cDirectoryFsync" cHSDirectoryFsync :: CString -> IO
2647
2748data DiskSync = NoDiskSync | FsyncDiskSync
2849
29−writeFileSync :: DiskSync -> FilePath -> String -> IO()
50+--using withFile here is OK because we use a WORM strategy- the file is written but not read until after the handle is synced, closed, and unhidden (moved from ".X" to "X") at the top level in the transaction directory
51+writeFileSync :: DiskSync -> FilePath -> T.Text -> IO()
3052writeFileSync sync path strOut = withFile path WriteMode handler
3153 where
3254 handler handle = do
33− hPutStr handle strOut
55+ BS'.hPut handle (TE.encodeUtf8 strOut)
3456 syncHandle sync handle
3557
3658renameSync :: DiskSync -> FilePath -> FilePath -> IO ()
@@ -39,31 +61,48 @@ renameSync sync srcPath dstPath = do
3961 syncDirectory sync dstPath
4062
4163-- System.Directory's renameFile/renameDirectory almost do exactly what we want except that it needlessly differentiates between directories and files
64+{-# ANN atomicRename ("HLint: ignore Eta reduce" :: String) #-}
4265atomicRename :: FilePath -> FilePath -> IO ()
43−atomicRename srcPath dstPath = do
66+atomicRename srcPath dstPath =
4467#if defined(mingw32_HOST_OS)
45− Win32.moveFileEx srcPath dstPath Win32.mOVEFILE_REPLACE_EXISTING
68+#if MIN_VERSION_Win32(2,6,0)
69+ let dst = Just dstPath
70+#else
71+ let dst = dstPath
72+#endif
73+ in
74+ Win32.moveFileEx srcPath dst Win32.mOVEFILE_REPLACE_EXISTING
4675#else
4776 Posix.rename srcPath dstPath
4877#endif
4978
5079syncHandle :: DiskSync -> Handle -> IO ()
51−syncHandle FsyncDiskSync handle = do
80+syncHandle FsyncDiskSync handle =
5281#if defined(mingw32_HOST_OS)
5382 withHandleToHANDLE handle (\h -> Win32.flushFileBuffers h)
83+#elif defined(linux_HOST_OS)
84+ do
85+ --fdatasync doesn't exist on macOS
86+ fd <- handleToFd handle
87+ fileSynchroniseDataOnly fd
88+ closeFd fd
5489#else
55− handleToFd handle >>= fileSynchroniseDataOnly
90+ do
91+ fd <- handleToFd handle
92+ fileSynchronise fd
93+ closeFd fd
5694#endif
95+
5796syncHandle NoDiskSync _ = pure ()
5897
5998syncDirectory :: DiskSync -> FilePath -> IO ()
6099syncDirectory FsyncDiskSync path = directoryFsync path
61100syncDirectory NoDiskSync _ = pure ()
62101
63−writeBSFileSync :: DiskSync -> FilePath -> BS.ByteString -> IO ()
64−writeBSFileSync sync path bstring = do
102+writeBSFileSync :: DiskSync -> FilePath -> BS'.ByteString -> IO ()
103+writeBSFileSync sync path bstring =
65104 withFile path WriteMode $ \handle -> do
66− BS.hPut handle bstring
105+ BS'.hPut handle bstring
67106 syncHandle sync handle
68107
69108directoryFsync :: FilePath -> IO ()
@@ -73,3 +112,22 @@ directoryFsync _ = pure () -- on Windows directory metadata cannot be synchroniz
73112directoryFsync path = throwErrnoIfMinus1Retry_ "directoryFsync" (withCString path $ \cpath -> cHSDirectoryFsync cpath)
74113#endif
75114
115+--prints out number of consumed file descriptors
116+printFdCount :: IO ()
117+printFdCount =
118+#if FDCOUNTSUPPORTED
119+ do
120+ fdc <- fdCount
121+ putStrLn ("Fd count: " ++ show fdc)
122+ --getLine >> pure ()
123+#else
124+ putStrLn "Fd count not supported on this OS."
125+#endif
126+
127+#if FDCOUNTSUPPORTED
128+fdCount :: IO Int
129+fdCount = do
130+ fds <- getDirectoryContents FDDIR
131+ pure ((length fds) - 2)
132+--not supported on non-linux
133+#endif
src/lib/ProjectM36/Relation.hs+82−79
@@ -4,20 +4,18 @@ import qualified Data.Set as S
44import qualified Data.HashSet as HS
55import Control.Monad
66import qualified Data.Vector as V
7−import qualified Data.Map as M
8−import ProjectM36.AtomType
97import ProjectM36.Base
108import ProjectM36.Tuple
119import qualified ProjectM36.Attribute as A
12−import qualified ProjectM36.AttributeNames as AS
1310import ProjectM36.TupleSet
1411import ProjectM36.Error
15−import qualified Control.Parallel.Strategies as P
12+--import qualified Control.Parallel.Strategies as P
1613import qualified ProjectM36.TypeConstructorDef as TCD
1714import qualified ProjectM36.DataConstructorDef as DCD
1815import qualified Data.Text as T
1916import Data.Either (isRight)
20−--import Debug.Trace
17+import System.Random.Shuffle
18+import Control.Monad.Random
2119
2220attributes :: Relation -> Attributes
2321attributes (Relation attrs _ ) = attrs
@@ -36,16 +34,18 @@ atomTypeForName attrName (Relation attrs _) = A.atomTypeForAttributeName attrNam
3634
3735mkRelationFromList :: Attributes -> [[Atom]] -> Either RelationalError Relation
3836mkRelationFromList attrs atomMatrix = do
39− tupSet <- mkTupleSetFromList attrs atomMatrix
40− return $ Relation attrs tupSet
37+ Relation attrs <$> mkTupleSetFromList attrs atomMatrix
38+
39+emptyRelationWithAttrs :: Attributes -> Relation
40+emptyRelationWithAttrs attrs = Relation attrs emptyTupleSet
4141
4242mkRelation :: Attributes -> RelationTupleSet -> Either RelationalError Relation
43−mkRelation attrs tupleSet = do
44− --check that all tuples have the same keys
45− --check that all tuples have keys (1-N) where N is the attribute count
46− case verifyTupleSet attrs tupleSet of
47− Left err -> Left err
48− Right verifiedTupleSet -> return $ Relation attrs verifiedTupleSet
43+mkRelation attrs tupleSet =
44+ --check that all tuples have the same keys
45+ --check that all tuples have keys (1-N) where N is the attribute count
46+ case verifyTupleSet attrs tupleSet of
47+ Left err -> Left err
48+ Right verifiedTupleSet -> return $ Relation attrs verifiedTupleSet
4949
5050--less safe version of mkRelation skips verifyTupleSet
5151--useful for infinite or thunked tuple sets
@@ -55,6 +55,10 @@ mkRelationDeferVerify :: Attributes -> RelationTupleSet -> Either RelationalErro
5555mkRelationDeferVerify attrs tupleSet = return $ Relation attrs (RelationTupleSet (filter tupleFilter (asList tupleSet)))
5656 where
5757 tupleFilter tuple = isRight (verifyTuple attrs tuple)
58+
59+--return a relation of the same type except without any tuples
60+relationWithEmptyTupleSet :: Relation -> Relation
61+relationWithEmptyTupleSet (Relation attrs _) = emptyRelationWithAttrs attrs
5862
5963mkRelationFromTuples :: Attributes -> [RelationTuple] -> Either RelationalError Relation
6064mkRelationFromTuples attrs tupleSetList = do
@@ -74,6 +78,7 @@ singletonTuple rel@(Relation _ tupleSet) = if cardinality rel == Finite 1 then
7478 else
7579 Nothing
7680
81+-- this is still unncessarily expensive for (bigx union bigx) because each tuple is hashed and compared for equality (when the hashes match), but the major expense is attributesEqual, but we already know that all tuple attributes are equal (it's a precondition)
7782union :: Relation -> Relation -> Either RelationalError Relation
7883union (Relation attrs1 tupSet1) (Relation attrs2 tupSet2) =
7984 if not (A.attributesEqual attrs1 attrs2)
@@ -81,32 +86,25 @@ union (Relation attrs1 tupSet1) (Relation attrs2 tupSet2) =
8186 else
8287 Right $ Relation attrs1 newtuples
8388 where
84− newtuples = RelationTupleSet $ HS.toList . HS.fromList $ (asList tupSet1) ++ (map (reorderTuple attrs1) (asList tupSet2))
89+ newtuples = tupleSetUnion attrs1 tupSet1 tupSet2
8590
86−project :: AttributeNames -> Relation -> Either RelationalError Relation
87−project projectionAttrNames rel =
88− case AS.projectionAttributesForAttributeNames (attributes rel) projectionAttrNames of
89− Left err -> Left err
90− Right newAttrs -> relFold (folder newAttrs) (Right $ Relation newAttrs emptyTupleSet) rel
91− where
92− folder newAttrs tupleToProject acc = case acc of
93− Left err -> Left err
94− Right acc2 -> union acc2 (Relation newAttrs (RelationTupleSet [tupleProject (A.attributeNameSet newAttrs) tupleToProject]))
91+project :: S.Set AttributeName -> Relation -> Either RelationalError Relation
92+project attrNames rel@(Relation _ tupSet) = do
93+ newAttrs <- A.projectionAttributesForNames attrNames (attributes rel)
94+ newTupleList <- mapM (tupleProject newAttrs) (asList tupSet)
95+ pure (Relation newAttrs (RelationTupleSet (HS.toList (HS.fromList newTupleList))))
9596
9697rename :: AttributeName -> AttributeName -> Relation -> Either RelationalError Relation
97−rename oldAttrName newAttrName rel@(Relation oldAttrs oldTupSet) =
98− if not attributeValid
99− then Left $ AttributeNamesMismatchError (S.singleton oldAttrName)
100− else if newAttributeInUse
101− then Left $ AttributeNameInUseError newAttrName
102− else
103− mkRelation newAttrs newTupSet
98+rename oldAttrName newAttrName rel@(Relation oldAttrs oldTupSet)
99+ | not attributeValid = Left $ AttributeNamesMismatchError (S.singleton oldAttrName)
100+ | newAttributeInUse = Left $ AttributeNameInUseError newAttrName
101+ | otherwise = mkRelation newAttrs newTupSet
104102 where
105103 newAttributeInUse = A.attributeNamesContained (S.singleton newAttrName) (attributeNames rel)
106104 attributeValid = A.attributeNamesContained (S.singleton oldAttrName) (attributeNames rel)
107105 newAttrs = A.renameAttributes oldAttrName newAttrName oldAttrs
108106 newTupSet = RelationTupleSet $ map tupsetmapper (asList oldTupSet)
109− tupsetmapper tuple = tupleRenameAttribute oldAttrName newAttrName tuple
107+ tupsetmapper = tupleRenameAttribute oldAttrName newAttrName
110108
111109--the algebra should return a relation of one attribute and one row with the arity
112110arity :: Relation -> Int
@@ -141,16 +139,16 @@ group groupAttrNames newAttrName rel@(Relation oldAttrs tupleSet) = do
141139-}
142140
143141--algorithm: self-join with image relation
144−group :: AttributeNames -> AttributeName -> Relation -> Either RelationalError Relation
142+group :: S.Set AttributeName -> AttributeName -> Relation -> Either RelationalError Relation
145143group groupAttrNames newAttrName rel = do
146− let nonGroupAttrNames = AS.invertAttributeNames groupAttrNames
147− nonGroupProjectionAttributes <- AS.projectionAttributesForAttributeNames (attributes rel) nonGroupAttrNames
148− groupProjectionAttributes <- AS.projectionAttributesForAttributeNames (attributes rel) groupAttrNames
144+ let nonGroupAttrNames = A.nonMatchingAttributeNameSet groupAttrNames (S.fromList (V.toList (A.attributeNames (attributes rel))))
145+ nonGroupProjectionAttributes <- A.projectionAttributesForNames nonGroupAttrNames (attributes rel)
146+ groupProjectionAttributes <- A.projectionAttributesForNames groupAttrNames (attributes rel)
149147 let groupAttr = Attribute newAttrName (RelationAtomType groupProjectionAttributes)
150148 matchingRelTuple tupIn = case imageRelationFor tupIn rel of
151− Right rel2 -> RelationTuple (V.singleton groupAttr) (V.singleton (RelationAtom rel2))
149+ Right rel2 -> RelationTuple (A.singleton groupAttr) (V.singleton (RelationAtom rel2))
152150 Left _ -> undefined
153− mogrifier tupIn = tupleExtend tupIn (matchingRelTuple tupIn)
151+ mogrifier tupIn = pure (tupleExtend tupIn (matchingRelTuple tupIn))
154152 newAttrs = A.addAttribute groupAttr nonGroupProjectionAttributes
155153 nonGroupProjection <- project nonGroupAttrNames rel
156154 relMogrify mogrifier newAttrs nonGroupProjection
@@ -159,10 +157,11 @@ group groupAttrNames newAttrName rel = do
159157--help restriction function
160158--returns a subrelation of
161159restrictEq :: RelationTuple -> Relation -> Either RelationalError Relation
162−restrictEq tuple rel = restrict rfilter rel
160+restrictEq tuple = restrict rfilter
163161 where
164− rfilter :: RelationTuple -> Bool
165− rfilter tupleIn = tupleIntersection tuple tupleIn == tuple
162+ rfilter :: RelationTuple -> Either RelationalError Bool
163+ rfilter tupleIn = do
164+ pure (tupleIntersection tuple tupleIn == tuple)
166165
167166-- unwrap relation-valued attribute
168167-- return error if relval attrs and nongroup attrs overlap
@@ -178,19 +177,19 @@ ungroup relvalAttrName rel = case attributesForRelval relvalAttrName rel of
178177 Left err -> Left err
179178 Right accRel -> do
180179 ungrouped <- tupleUngroup relvalAttrName newAttrs tupleIn
181− union accRel ungrouped
180+ accRel `union` ungrouped
182181
183182--take an relval attribute name and a tuple and ungroup the relval
184183tupleUngroup :: AttributeName -> Attributes -> RelationTuple -> Either RelationalError Relation
185184tupleUngroup relvalAttrName newAttrs tuple = do
186185 relvalRelation <- relationForAttributeName relvalAttrName tuple
186+ let nonGroupAttrs = A.intersection newAttrs (tupleAttributes tuple)
187+ nonGroupTupleProjection <- tupleProject nonGroupAttrs tuple
188+ let folder tupleIn acc = case acc of
189+ Left err -> Left err
190+ Right accRel ->
191+ union accRel $ Relation newAttrs (RelationTupleSet [tupleExtend nonGroupTupleProjection tupleIn])
187192 relFold folder (Right $ Relation newAttrs emptyTupleSet) relvalRelation
188− where
189− nonGroupTupleProjection = tupleProject nonGroupAttrNames tuple
190− nonGroupAttrNames = A.attributeNameSet newAttrs
191− folder tupleIn acc = case acc of
192− Left err -> Left err
193− Right accRel -> union accRel $ Relation newAttrs (RelationTupleSet [tupleExtend nonGroupTupleProjection tupleIn])
194193
195194attributesForRelval :: AttributeName -> Relation -> Either RelationalError Attributes
196195attributesForRelval relvalAttrName (Relation attrs _) = do
@@ -199,11 +198,11 @@ attributesForRelval relvalAttrName (Relation attrs _) = do
199198 (RelationAtomType relAttrs) -> Right relAttrs
200199 _ -> Left $ AttributeIsNotRelationValuedError relvalAttrName
201200
202−restrict :: (RelationTuple -> Bool) -> Relation -> Either RelationalError Relation
203−--restrict rfilter (Relation attrs tupset) = Right $ Relation attrs $ HS.filter rfilter tupset
204−restrict rfilter (Relation attrs tupset) = Right $ Relation attrs processedTupSet
205− where
206− processedTupSet = RelationTupleSet ((filter rfilter (asList tupset)) `P.using` (P.parListChunk 1000 P.rdeepseq))
201+type RestrictionFilter = RelationTuple -> Either RelationalError Bool
202+restrict :: RestrictionFilter -> Relation -> Either RelationalError Relation
203+restrict rfilter (Relation attrs tupset) = do
204+ tuples <- filterM rfilter (asList tupset)
205+ Right $ Relation attrs (RelationTupleSet tuples)
207206
208207--joins on columns with the same name- use rename to avoid this- base case: cartesian product
209208--after changing from string atoms, there needs to be a type-checking step!
@@ -215,8 +214,7 @@ join (Relation attrs1 tupSet1) (Relation attrs2 tupSet2) = do
215214 joinedTupSet <- singleTupleSetJoin newAttrs tuple1 tupSet2
216215 return $ joinedTupSet ++ accumulator
217216 newTupSetList <- foldM tupleSetJoiner [] (asList tupSet1)
218− newTupSet <- mkTupleSet newAttrs newTupSetList
219− return $ Relation newAttrs newTupSet
217+ Relation newAttrs <$> mkTupleSet newAttrs newTupSetList
220218
221219-- | Difference takes two relations of the same type and returns a new relation which contains only tuples which appear in the first relation but not the second.
222220difference :: Relation -> Relation -> Either RelationalError Relation
@@ -229,11 +227,11 @@ difference relA relB =
229227 where
230228 attrsA = attributes relA
231229 attrsB = attributes relB
232− rfilter tupInA = relFold (\tupInB acc -> if acc == False then False else if tupInB == tupInA then False else True) True relB
230+ rfilter tupInA = relFold (\tupInB acc -> if acc == Right False then pure False else pure (tupInB /= tupInA)) (Right True) relB
233231
234232--a map should NOT change the structure of a relation, so attributes should be constant
235233relMap :: (RelationTuple -> Either RelationalError RelationTuple) -> Relation -> Either RelationalError Relation
236−relMap mapper (Relation attrs tupleSet) = do
234+relMap mapper (Relation attrs tupleSet) =
237235 case forM (asList tupleSet) typeMapCheck of
238236 Right remappedTupleSet -> mkRelation attrs (RelationTupleSet remappedTupleSet)
239237 Left err -> Left err
@@ -242,17 +240,24 @@ relMap mapper (Relation attrs tupleSet) = do
242240 remappedTuple <- mapper tupleIn
243241 if tupleAttributes remappedTuple == tupleAttributes tupleIn
244242 then Right remappedTuple
245− else Left $ TupleAttributeTypeMismatchError (A.attributesDifference (tupleAttributes tupleIn) attrs)
243+ else Left (TupleAttributeTypeMismatchError (A.attributesDifference (tupleAttributes tupleIn) attrs))
246244
247−relMogrify :: (RelationTuple -> RelationTuple) -> Attributes -> Relation -> Either RelationalError Relation
245+relMogrify :: (RelationTuple -> Either RelationalError RelationTuple) -> Attributes -> Relation -> Either RelationalError Relation
248246relMogrify mapper newAttributes (Relation _ tupSet) = do
249− mkRelationFromTuples newAttributes newTuples
250− where
251− newTuples = map mapper (asList tupSet)
247+ newTuples <- mapM (fmap (reorderTuple newAttributes) . mapper) (asList tupSet)
248+
249+ mkRelationFromTuples newAttributes newTuples
252250
253251relFold :: (RelationTuple -> a -> a) -> a -> Relation -> a
254252relFold folder acc (Relation _ tupleSet) = foldr folder acc (asList tupleSet)
255253
254+-- | Generate a randomly-ordered list of tuples from the relation.
255+toList :: Relation -> IO [RelationTuple]
256+toList rel = do
257+ gen <- newStdGen
258+ let rel' = evalRand (randomizeTupleOrder rel) gen
259+ pure (relFold (:) [] rel')
260+
256261--image relation as defined by CJ Date
257262--given tupleA and relationB, return restricted relation where tuple attributes are not the attribues in tupleA but are attributes in relationB and match the tuple's value
258263
@@ -260,7 +265,7 @@ relFold folder acc (Relation _ tupleSet) = foldr folder acc (asList tupleSet)
260265imageRelationFor :: RelationTuple -> Relation -> Either RelationalError Relation
261266imageRelationFor matchTuple rel = do
262267 restricted <- restrictEq matchTuple rel --restrict across matching tuples
263− let projectionAttrNames = AttributeNames $ A.nonMatchingAttributeNameSet (attributeNames rel) (tupleAttributeNameSet matchTuple)
268+ let projectionAttrNames = A.nonMatchingAttributeNameSet (attributeNames rel) (tupleAttributeNameSet matchTuple)
264269 project projectionAttrNames restricted --project across attributes not in rel
265270
266271--returns a relation-valued attribute image relation for each tuple in rel1
@@ -286,24 +291,22 @@ typesAsRelation types = mkRelationFromTuples attrs tuples
286291 dConsType = RelationAtomType subAttrs
287292 tuples = map mkTypeConsDescription types
288293
289− mkTypeConsDescription (tCons, dConsList) = RelationTuple attrs (V.fromList [TextAtom (TCD.name tCons), mkDataConsRelation dConsList])
294+ mkTypeConsDescription (tCons, dConsList) =
295+ RelationTuple attrs (V.fromList [TextAtom (TCD.name tCons), mkDataConsRelation dConsList])
290296
291− mkDataConsRelation dConsList = case mkRelationFromTuples subAttrs $ map (\dCons -> RelationTuple subAttrs (V.singleton $ TextAtom $ T.intercalate " " ((DCD.name dCons):(map (T.pack . show) (DCD.fields dCons))))) dConsList of
297+ mkDataConsRelation dConsList = case mkRelationFromTuples subAttrs $ map (\dCons -> RelationTuple subAttrs (V.singleton $ TextAtom $ T.intercalate " " (DCD.name dCons:map (T.pack . show) (DCD.fields dCons)))) dConsList of
292298 Left err -> error ("mkRelationFromTuples pooped " ++ show err)
293299 Right rel -> RelationAtom rel
294−
295−-- | Return a Relation describing the relation variables.
296−relationVariablesAsRelation :: M.Map RelVarName Relation -> Either RelationalError Relation
297−relationVariablesAsRelation relVarMap = mkRelationFromList attrs tups
298− where
299− subrelAttrs = A.attributesFromList [Attribute "attribute" TextAtomType, Attribute "type" TextAtomType]
300− attrs = A.attributesFromList [Attribute "name" TextAtomType,
301− Attribute "attributes" (RelationAtomType subrelAttrs)]
302− tups = map relVarToAtomList (M.toList relVarMap)
303− relVarToAtomList (rvName, rel) = [TextAtom rvName, attributesToRel (attributes rel)]
304− attributesToRel attrl = case mkRelationFromList subrelAttrs (map attrAtoms (V.toList attrl)) of
305− Left err -> error ("relationVariablesAsRelation pooped " ++ show err)
306− Right rel -> RelationAtom rel
307− attrAtoms a = [TextAtom (A.attributeName a), TextAtom (prettyAtomType (A.atomType a))]
308300
309−
301+-- | Randomly resort the tuples. This is useful for emphasizing that two relations are equal even when they are printed to the console in different orders.
302+randomizeTupleOrder :: MonadRandom m => Relation -> m Relation
303+randomizeTupleOrder (Relation attrs tupSet) =
304+ Relation attrs . RelationTupleSet <$> shuffleM (asList tupSet)
305+
306+-- returns a tuple from the tupleset- this is useful for priming folds over the tuples
307+oneTuple :: Relation -> Maybe RelationTuple
308+oneTuple (Relation _ (RelationTupleSet [])) = Nothing
309+oneTuple (Relation _ (RelationTupleSet (x:_))) = Just x
310+
311+tuplesList :: Relation -> [RelationTuple]
312+tuplesList (Relation _ tupleSet) = asList tupleSet
src/lib/ProjectM36/Relation/Parse/CSV.hs+142−30
@@ -1,20 +1,27 @@
11module ProjectM36.Relation.Parse.CSV where
22--parse Relations from CSV
3+import ProjectM36.Base
4+import ProjectM36.Error
5+import ProjectM36.Relation
6+import ProjectM36.AtomType
7+import ProjectM36.DataTypes.Interval
8+import qualified ProjectM36.Attribute as A
9+
310import Data.Csv.Parser
411import qualified Data.Vector as V
5−import Data.Char (ord)
12+import Data.Char (ord, isUpper, isSpace)
613import qualified Data.ByteString.Lazy as BS
7−import ProjectM36.Base
8−import ProjectM36.Relation
9−import ProjectM36.Error
1014import Data.Text.Encoding (decodeUtf8)
11−import qualified ProjectM36.Attribute as A
1215import qualified Data.Set as S
13−import Data.HashMap.Lazy as HM
16+import qualified Data.HashMap.Lazy as HM
1417import qualified Data.List as L
1518import qualified Data.Text as T
16−import Data.Attoparsec.ByteString.Lazy
17−import ProjectM36.Atom
19+import qualified Data.Attoparsec.ByteString.Lazy as APBL
20+import qualified Data.Attoparsec.Text as APT
21+import Control.Arrow
22+import Text.Read hiding (parens)
23+import Control.Applicative
24+import Data.Either
1825
1926data CsvImportError = CsvParseError String |
2027 AttributeMappingError RelationalError |
@@ -24,30 +31,135 @@ data CsvImportError = CsvParseError String |
2431csvDecodeOptions :: DecodeOptions
2532csvDecodeOptions = DecodeOptions {decDelimiter = fromIntegral (ord ',')}
2633
27−--special case from Text- outer quotes are *not* required in CSV, so we have to add them to make it parseable
28−makeAtomFromCSVText :: AttributeName -> AtomType -> T.Text -> Either RelationalError Atom
29−makeAtomFromCSVText attrName aType textIn = makeAtomFromText attrName aType $ if aType == TextAtomType then
30− ("\"" `T.append` textIn `T.append` "\"")
31− else
32− textIn
33−
34−csvAsRelation :: BS.ByteString -> Attributes -> Either CsvImportError Relation
35−csvAsRelation inString attrs = case parse (csvWithHeader csvDecodeOptions) inString of
36− Fail _ _ err -> Left (CsvParseError err)
37− Done _ (headerRaw,vecMapsRaw) -> do
34+csvAsRelation :: Attributes -> TypeConstructorMapping -> BS.ByteString -> Either CsvImportError Relation
35+csvAsRelation attrs tConsMap inString = case APBL.parse (csvWithHeader csvDecodeOptions) inString of
36+ APBL.Fail _ _ err -> Left (CsvParseError err)
37+ APBL.Done _ (headerRaw,vecMapsRaw) -> do
3838 let strHeader = V.map decodeUtf8 headerRaw
3939 strMapRecords = V.map convertMap vecMapsRaw
40− convertMap hmap = HM.fromList $ L.map (\(k,v) -> (decodeUtf8 k, (T.unpack . decodeUtf8) v)) (HM.toList hmap)
41− attrNames = V.map A.attributeName attrs
42− attrNameSet = S.fromList (V.toList attrNames)
40+ convertMap hmap = HM.fromList $ L.map (decodeUtf8 *** (T.unpack . decodeUtf8)) (HM.toList hmap)
41+ attrNameSet = A.attributeNameSet attrs
4342 headerSet = S.fromList (V.toList strHeader)
43+ parseAtom attrName aType textIn = case APT.parseOnly (parseCSVAtomP attrName tConsMap aType <* APT.endOfInput) textIn of
44+ Left err -> Left (ParseError (T.pack err))
45+ Right eAtom -> eAtom
4446 makeTupleList :: HM.HashMap AttributeName String -> [Either CsvImportError Atom]
45− makeTupleList tupMap = V.toList $ V.map (\attr -> either (Left . AttributeMappingError) Right $ makeAtomFromCSVText (A.attributeName attr) (A.atomType attr) (T.pack $ tupMap HM.! (A.attributeName attr))) attrs
46− case attrNameSet == headerSet of
47− False -> Left $ HeaderAttributeMismatchError (S.difference attrNameSet headerSet)
48− True -> do
49− tupleList <- mapM sequence $ V.toList (V.map makeTupleList strMapRecords)
50− case mkRelationFromList attrs tupleList of
51− Left err -> Left (AttributeMappingError err)
52− Right rel -> Right rel
47+ makeTupleList tupMap = V.toList $ V.map (\attr ->
48+ either (Left . AttributeMappingError) Right $
49+ parseAtom (A.attributeName attr) (A.atomType attr) (T.pack $ tupMap HM.! A.attributeName attr)) (attributesVec attrs)
50+ if attrNameSet == headerSet then do
51+ tupleList <- mapM sequence $ V.toList (V.map makeTupleList strMapRecords)
52+ case mkRelationFromList attrs tupleList of
53+ Left err -> Left (AttributeMappingError err)
54+ Right rel -> Right rel
55+ else
56+ Left $ HeaderAttributeMismatchError (S.difference attrNameSet headerSet)
57+
5358
59+parseCSVAtomP :: AttributeName -> TypeConstructorMapping -> AtomType -> APT.Parser (Either RelationalError Atom)
60+parseCSVAtomP _ _ IntegerAtomType = Right . IntegerAtom <$> APT.decimal
61+parseCSVAtomP _ _ IntAtomType = Right . IntAtom <$> APT.decimal
62+parseCSVAtomP _ _ DoubleAtomType = Right . DoubleAtom <$> APT.double
63+parseCSVAtomP _ _ TextAtomType =
64+ Right . TextAtom <$> (quotedString <|> takeToEndOfData)
65+parseCSVAtomP _ _ DayAtomType = do
66+ dString <- T.unpack <$> takeToEndOfData
67+ case readMaybe dString of
68+ Nothing -> fail ("invalid Day string: " ++ dString)
69+ Just date -> pure (Right (DayAtom date))
70+parseCSVAtomP _ _ DateTimeAtomType = do
71+ dString <- T.unpack <$> takeToEndOfData
72+ case readMaybe dString of
73+ Nothing -> fail ("invalid Date string: " ++ dString)
74+ Just date -> pure (Right (DateTimeAtom date))
75+parseCSVAtomP _ _ ByteStringAtomType = do
76+ bsString <- T.unpack <$> takeToEndOfData
77+ case readMaybe bsString of
78+ Nothing -> fail ("invalid ByteString string: " ++ bsString)
79+ Just bs -> pure (Right (ByteStringAtom bs))
80+parseCSVAtomP _ _ BoolAtomType = do
81+ bString <- T.unpack <$> takeToEndOfData
82+ case readMaybe bString of
83+ Nothing -> fail ("invalid BoolAtom string: " ++ bString)
84+ Just b -> pure (Right (BoolAtom b))
85+parseCSVAtomP _ _ RelationalExprAtomType = do
86+ reString <- T.unpack <$> takeToEndOfData
87+ case readMaybe reString of
88+ Nothing -> fail ("invalid RelationalExprAtom string: " ++ reString)
89+ Just b -> pure (Right (RelationalExprAtom b))
90+parseCSVAtomP attrName tConsMap typ@(ConstructedAtomType _ tvmap)
91+ | isIntervalAtomType typ = do
92+ begin <- (APT.char '[' >> pure False) <|> (APT.char '(' >> pure True)
93+ let iType = intervalSubType typ
94+ eBeginv <- parseCSVAtomP attrName tConsMap iType
95+ case eBeginv of
96+ Left err -> pure (Left err)
97+ Right beginv -> do
98+ _ <- APT.char ','
99+ eEndv <- parseCSVAtomP attrName tConsMap iType
100+ case eEndv of
101+ Left err -> pure (Left err)
102+ Right endv -> do
103+ end <- (APT.char ']' >> pure False) <|>
104+ (APT.char ')' >> pure True)
105+ pure (Right (ConstructedAtom "Interval" typ [beginv, endv,
106+ BoolAtom begin, BoolAtom end]))
107+ | otherwise = do
108+ dConsName <- capitalizedIdentifier
109+ APT.skipSpace
110+ --we need to look up the name right away in order to determine the types of the following arguments
111+ -- grab the data constructor
112+ case findDataConstructor dConsName tConsMap of
113+ Nothing -> pure (Left (NoSuchDataConstructorError dConsName))
114+ Just (_, dConsDef) ->
115+ -- identify the data constructor's expected atom type args
116+ case resolvedAtomTypesForDataConstructorDefArgs tConsMap tvmap dConsDef of
117+ Left err -> pure (Left err)
118+ Right argAtomTypes -> do
119+ atomArgs <- mapM (\argTyp -> let parseNextAtom = parseCSVAtomP attrName tConsMap argTyp <* APT.skipSpace in
120+ case argTyp of
121+ ConstructedAtomType _ _ ->
122+ parens parseNextAtom <|>
123+ parseNextAtom
124+ _ -> parseNextAtom
125+ ) argAtomTypes
126+ case lefts atomArgs of
127+ [] -> pure (Right (ConstructedAtom dConsName typ (rights atomArgs)))
128+ errs -> pure (Left (someErrors errs))
129+parseCSVAtomP attrName _ (RelationAtomType _) = pure (Left (RelationValuedAttributesNotSupportedError [attrName]))
130+parseCSVAtomP _ _ (TypeVariableType x) = pure (Left (TypeConstructorTypeVarMissing x))
131+
132+capitalizedIdentifier :: APT.Parser T.Text
133+capitalizedIdentifier = do
134+ fletter <- APT.satisfy isUpper APT.<?> "capitalized data constructor letter"
135+ rest <- APT.takeWhile (\c -> not (isSpace c || c == ')')) APT.<?> "data constructor name"
136+ pure (fletter `T.cons` rest)
137+
138+--read data for Text.Read parser but be wary of end of interval blocks
139+takeToEndOfData :: APT.Parser T.Text
140+takeToEndOfData = APT.takeWhile (APT.notInClass ",)]")
141+
142+parens :: APT.Parser a -> APT.Parser a
143+parens p = do
144+ APT.skip (== '(')
145+ APT.skipSpace
146+ v <- p
147+ APT.skipSpace
148+ APT.skip (== ')')
149+ pure v
150+
151+quotedString :: APT.Parser T.Text
152+quotedString = do
153+ let escapeMap = [('"','"'), ('n', '\n'), ('r', '\r')]
154+ APT.skip (== '"')
155+ (_, s) <- APT.runScanner [] (\prevl nextChar -> case prevl of
156+ [] -> Just [nextChar]
157+ chars | last chars == '\\' ->
158+ case lookup nextChar escapeMap of
159+ Nothing -> Just (chars ++ [nextChar]) --there is no escape sequence, so leave backslash + char
160+ Just escapeVal -> Just (init chars ++ [escapeVal]) -- nuke the backslash and add the escapeVal
161+ | nextChar == '"' -> Nothing
162+ | otherwise -> Just (chars ++ [nextChar]))
163+ APT.skip (== '"')
164+ pure (T.pack s)
165+
src/lib/ProjectM36/Relation/Show/CSV.hs+15−14
@@ -1,27 +1,29 @@
11{-# OPTIONS_GHC -fno-warn-orphans #-}
22module ProjectM36.Relation.Show.CSV where
33import ProjectM36.Base
4−import ProjectM36.Attribute
4+import ProjectM36.Attribute as A
55import Data.Csv
66import ProjectM36.Tuple
77import qualified Data.ByteString.Lazy as BS
88import qualified Data.Vector as V
99import ProjectM36.Error
1010import qualified Data.Text.Encoding as TE
11−import qualified Data.Text as T
1211import ProjectM36.Atom
1312
1413--spit out error for relations without attributes (since relTrue and relFalse cannot be distinguished then as CSV) and for relations with relation-valued attributes
1514relationAsCSV :: Relation -> Either RelationalError BS.ByteString
16−relationAsCSV (Relation attrs tupleSet) = if relValAttrs /= [] then --check for relvalued attributes
17− Left $ RelationValuedAttributesNotSupportedError (map attributeName relValAttrs)
18− else if V.length attrs == 0 then --check that there is at least one attribute
19− Left $ TupleAttributeCountMismatchError 0
20− else
21− Right $ encodeByName bsAttrNames $ map RecordRelationTuple (asList tupleSet)
15+relationAsCSV (Relation attrs tupleSet)
16+ --check for relvalued attributes
17+ | relValAttrs /= [] =
18+ Left $ RelationValuedAttributesNotSupportedError (map attributeName relValAttrs)
19+ --check that there is at least one attribute
20+ | A.null attrs =
21+ Left $ TupleAttributeCountMismatchError 0
22+ | otherwise =
23+ Right $ encodeByName bsAttrNames $ map RecordRelationTuple (asList tupleSet)
2224 where
23− relValAttrs = V.toList $ V.filter (isRelationAtomType . atomType) attrs
24− bsAttrNames = V.map (TE.encodeUtf8 . attributeName) attrs
25+ relValAttrs = V.toList $ V.filter (isRelationAtomType . atomType) (attributesVec attrs)
26+ bsAttrNames = V.map (TE.encodeUtf8 . attributeName) (attributesVec attrs)
2527
2628{-
2729instance ToRecord RelationTuple where
@@ -31,16 +33,15 @@ instance ToRecord RelationTuple where
3133newtype RecordRelationTuple = RecordRelationTuple {unTuple :: RelationTuple}
3234
3335instance ToNamedRecord RecordRelationTuple where
34− toNamedRecord rTuple = namedRecord $ map (\(k,v) -> TE.encodeUtf8 k .= (RecordAtom v)) (tupleAssocs $ unTuple rTuple)
36+ toNamedRecord rTuple = namedRecord $ map (\(k,v) -> TE.encodeUtf8 k .= RecordAtom v) (tupleAssocs $ unTuple rTuple)
3537
3638instance DefaultOrdered RecordRelationTuple where
37− headerOrder (RecordRelationTuple tuple) = V.map (TE.encodeUtf8 . attributeName) (tupleAttributes tuple)
39+ headerOrder (RecordRelationTuple tuple) = V.map (TE.encodeUtf8 . attributeName) (attributesVec (tupleAttributes tuple))
3840
3941newtype RecordAtom = RecordAtom {unAtom :: Atom}
4042
4143instance ToField RecordAtom where
42− toField (RecordAtom (ConstructedAtom dConsName _ atomList)) = TE.encodeUtf8 $ dConsName `T.append` T.intercalate " " (map atomToText atomList)
43− toField (RecordAtom (TextAtom atomVal)) = TE.encodeUtf8 atomVal --squelch extraneous quotes for text type- the CSV library will add them if necessary
44+ toField (RecordAtom (TextAtom atomVal)) = TE.encodeUtf8 atomVal --without this, CSV text atoms are doubly quoted
4445 toField (RecordAtom atomVal) = (TE.encodeUtf8 . atomToText) atomVal
4546
4647
src/lib/ProjectM36/Relation/Show/Gnuplot.hs+10−10
@@ -23,14 +23,14 @@ data PlotError = InvalidAttributeCountError |
2323
2424--plotRelation :: Relation -> Either PlotError
2525
26−intFromAtomIndex :: Int -> RelationTuple -> Int
27−intFromAtomIndex index tup = (\i -> castInt i) $ (tupleAtoms tup) V.! index
26+intFromAtomIndex :: Int -> RelationTuple -> Int --warning- clips or overflows Integer -> Int
27+intFromAtomIndex index tup = fromIntegral $ castInt $ tupleAtoms tup V.! index
2828
2929graph1DRelation :: Relation -> Plot2D.T Int Int
3030graph1DRelation rel = Plot2D.list Graph2D.listPoints $ points1DRelation rel
3131
3232points1DRelation :: Relation -> [Int]
33−points1DRelation rel = relFold folder [] rel
33+points1DRelation = relFold folder []
3434 where
3535 folder tup acc = intFromAtomIndex 0 tup : acc
3636
@@ -38,16 +38,16 @@ graph2DRelation :: Relation -> Plot2D.T Int Int
3838graph2DRelation rel = Plot2D.list Graph2D.points (points2DRelation rel)
3939
4040points2DRelation :: Relation -> [(Int, Int)]
41−points2DRelation rel = relFold folder [] rel
41+points2DRelation = relFold folder []
4242 where
4343 folder tup acc = (intFromAtomIndex 0 tup, intFromAtomIndex 1 tup) : acc
4444
4545graph3DRelation :: Relation -> Plot3D.T Int Int Int
46−graph3DRelation rel = do
46+graph3DRelation rel =
4747 Plot3D.cloud Graph3D.points $ points3DRelation rel
4848
4949points3DRelation :: Relation -> [(Int, Int, Int)]
50−points3DRelation rel = relFold folder [] rel
50+points3DRelation = relFold folder []
5151 where
5252 folder tup acc = (intFromAtomIndex 0 tup, intFromAtomIndex 1 tup, intFromAtomIndex 2 tup) : acc
5353
@@ -72,11 +72,11 @@ plotRelation :: Relation -> IO (Maybe PlotError)
7272plotRelation rel = let attrTypes = V.replicate (arity rel) IntAtomType in
7373 if attrTypes /= A.atomTypes (attributes rel) then
7474 return $ Just InvalidAttributeTypeError
75− else do
75+ else
7676 case arity rel of
77− 1 -> (GPA.plotDefault $ graph1DRelation rel) >> return Nothing
78− 2 -> (GPA.plotDefault $ graph2DRelation rel) >> return Nothing
79− 3 -> (GPA.plotDefault $ graph3DRelation rel) >> return Nothing
77+ 1 -> GPA.plotDefault (graph1DRelation rel) >> return Nothing
78+ 2 -> GPA.plotDefault (graph2DRelation rel) >> return Nothing
79+ 3 -> GPA.plotDefault (graph3DRelation rel) >> return Nothing
8080 _ -> return $ Just InvalidAttributeCountError
8181
8282
src/lib/ProjectM36/Relation/Show/HTML.hs+36−10
@@ -3,22 +3,44 @@ import ProjectM36.Base
33import ProjectM36.Relation
44import ProjectM36.Tuple
55import ProjectM36.Atom
6+import ProjectM36.Attribute as A
7+import ProjectM36.AtomType
68import qualified Data.List as L
7−import ProjectM36.Attribute
8−import Data.Text (append, Text, pack)
9+import Data.Text (Text, pack)
910import qualified Data.Text as T
1011import qualified Data.Text.IO as TIO
12+#if __GLASGOW_HASKELL__ < 804
13+import Data.Monoid
14+#endif
1115
1216attributesAsHTML :: Attributes -> Text
13−attributesAsHTML attrs = "<tr>" `append` (T.concat $ map oneAttrHTML attrNameList) `append` "</tr>"
17+attributesAsHTML attrs = "<tr>" <> T.concat (map oneAttrHTML (A.toList attrs)) <> "</tr>"
1418 where
15− oneAttrHTML attrName = "<th>" `append` attrName `append` "</th>"
16− attrNameList = sortedAttributeNameList (attributeNameSet attrs)
19+ oneAttrHTML attr = "<th>" <> prettyAttribute attr <> "</th>"
1720
1821relationAsHTML :: Relation -> Text
19−relationAsHTML rel@(Relation attrNameSet tupleSet) = "<table border=\"1\">" `append` (attributesAsHTML attrNameSet) `append` (tupleSetAsHTML tupleSet) `append` "<tfoot>" `append` tablefooter `append` "</tfoot></table>"
22+-- web browsers don't display tables with empty cells or empty headers, so we have to insert some placeholders- it's not technically the same, but looks as expected in the browser
23+relationAsHTML rel@(Relation attrNameSet tupleSet)
24+ | rel == relationTrue = pm36relcss <>
25+ tablestart <>
26+ "<tr><th></th></tr>" <>
27+ "<tr><td></td></tr>" <>
28+ tablefooter <> "</table>"
29+ | rel == relationFalse = pm36relcss <>
30+ tablestart <>
31+ "<tr><th></th></tr>" <>
32+ tablefooter <>
33+ "</table>"
34+ | otherwise = pm36relcss <>
35+ tablestart <>
36+ attributesAsHTML attrNameSet <>
37+ tupleSetAsHTML tupleSet <>
38+ tablefooter <>
39+ "</table>"
2040 where
21− tablefooter = "<tr><td colspan=\"100%\">" `append` (pack $ show (cardinality rel)) `append` " tuples</td></tr>"
41+ pm36relcss = "<style>.pm36relation {empty-cells: show;} .pm36relation tbody td, .pm36relation th { border: 1px solid black;}</style>"
42+ tablefooter = "<tfoot><tr><td colspan=\"100%\">" <> pack (show (cardinality rel)) <> " tuples</td></tr></tfoot>"
43+ tablestart = "<table class=\"pm36relation\"\">"
2244
2345writeHTML :: Text -> IO ()
2446writeHTML = TIO.writeFile "/home/agentm/rel.html"
@@ -27,11 +49,15 @@ writeRel :: Relation -> IO ()
2749writeRel = writeHTML . relationAsHTML
2850
2951tupleAsHTML :: RelationTuple -> Text
30−tupleAsHTML tuple = "<tr>" `append` T.concat (L.map tupleFrag (tupleSortedAssocs tuple)) `append` "</tr>"
52+tupleAsHTML tuple = "<tr>" <> T.concat (L.map tupleFrag (tupleAssocs tuple)) <> "</tr>"
3153 where
32− tupleFrag tup = "<td>" `append` atomToText (snd tup) `append` "</td>"
54+ tupleFrag tup = "<td>" <> atomAsHTML (snd tup) <> "</td>"
55+ atomAsHTML (RelationAtom rel) = relationAsHTML rel
56+ atomAsHTML (TextAtom t) = "&quot;" <> t <> "&quot;"
57+ atomAsHTML atom = atomToText atom
3358
3459tupleSetAsHTML :: RelationTupleSet -> Text
3560tupleSetAsHTML tupSet = foldr folder "" (asList tupSet)
3661 where
37− folder tuple acc = acc `append` tupleAsHTML tuple
62+ folder tuple acc = acc <> tupleAsHTML tuple
63+
src/lib/ProjectM36/Relation/Show/Term.hs+39−35
@@ -5,10 +5,16 @@ import ProjectM36.Atom
55import ProjectM36.AtomType
66import ProjectM36.Tuple
77import ProjectM36.Relation
8−import ProjectM36.Attribute
8+import ProjectM36.Attribute hiding (null)
99import qualified Data.List as L
1010import qualified Data.Text as T
11−import qualified Data.Vector as V
11+import Control.Arrow hiding (left)
12+import Data.ByteString.Base64 as B64
13+import qualified Data.Text.Encoding as TE
14+#if __GLASGOW_HASKELL__ < 804
15+import Data.Monoid
16+#endif
17+import ProjectM36.WCWidth --guess the width that the character will appear as in the terminal
1218
1319boxV :: StringType
1420boxV = "│"
@@ -36,16 +42,6 @@ boxBB = "┴"
3642boxC :: StringType
3743boxC = "┼"
3844
39−dboxH :: StringType
40−dboxH = "═"
41−dboxL :: StringType
42−dboxL = "╞"
43−dboxR :: StringType
44−dboxR = "╡"
45−
46−class TermSize a where
47− termLength :: a -> Int
48−
4945--represent a relation as a table similar to those drawn by Date
5046type Cell = StringType
5147type Table = ([Cell], [[Cell]]) --header, body
@@ -60,10 +56,10 @@ cellLocations tab@(header, _) = (maxWidths, maxHeights)
6056 where
6157 cellSizeMatrix = cellSizes tab
6258 maxWidths = foldl mergeMax (baseSize (length header)) (map fst cellSizeMatrix)
63− baseSize num = take num (repeat 0)
59+ baseSize num = replicate num 0
6460 rowHeights = map snd cellSizeMatrix
65− maxHeights = map (\l -> if length l == 0 then 0 else L.maximumBy compare l) rowHeights
66− mergeMax a b = map (\(c,d) -> max c d) (zip a b)
61+ maxHeights = map (\l -> if null l then 0 else L.maximum l) rowHeights
62+ mergeMax = zipWith max
6763
6864--the normal "lines" function returns an empty list for an empty string which is not what we want
6965breakLines :: StringType -> [StringType]
@@ -71,20 +67,20 @@ breakLines "" = [""]
7167breakLines x = T.lines x
7268
7369cellSizes :: Table -> [([Int], [Int])]
74−cellSizes (header, body) = map (\row -> (map maxRowWidth row, map (length . breakLines) row)) allRows
70+cellSizes (header, body) = map (map maxRowWidth &&& map (length . breakLines)) allRows
7571 where
76− maxRowWidth row = if length (lengths row) == 0 then
72+ maxRowWidth row = if null (lengths row) then
7773 0
7874 else
79− L.maximumBy compare (lengths row)
80− lengths row = map T.length (breakLines row)
81− allRows = [header] ++ body
75+ L.maximum (lengths row)
76+ lengths row = map stringDisplayLength (breakLines row)
77+ allRows = header : body
8278
8379relationAsTable :: Relation -> Table
8480relationAsTable rel@(Relation _ tupleSet) = (header, body)
8581 where
86− oAttrs = orderedAttributes rel
87− oAttrNames = orderedAttributeNames rel
82+ oAttrs = orderedAttributes (attributes rel)
83+ oAttrNames = orderedAttributeNames (attributes rel)
8884 header = map prettyAttribute oAttrs
8985 body :: [[Cell]]
9086 body = L.foldl' tupleFolder [] (asList tupleSet)
@@ -101,7 +97,9 @@ showParens predicate f = if predicate then
10197
10298showAtom :: Int -> Atom -> StringType
10399showAtom _ (RelationAtom rel) = renderTable $ relationAsTable rel
104−showAtom level (ConstructedAtom dConsName _ atoms) = showParens (level >= 1 && length atoms >= 1) $ T.concat (L.intersperse " " (dConsName : (map (showAtom 1) atoms)))
100+showAtom level (ConstructedAtom dConsName _ atoms) = showParens (level >= 1 && not (null atoms)) $ T.concat (L.intersperse " " (dConsName : map (showAtom 1) atoms))
101+showAtom _ (TextAtom t) = "\"" <> t <> "\""
102+showAtom _ (ByteStringAtom bs) = TE.decodeUtf8 (B64.encode bs)
105103showAtom _ atom = atomToText atom
106104
107105renderTable :: Table -> StringType
@@ -112,26 +110,27 @@ renderTable table = renderHeader table (fst cellLocs) `T.append` renderBody (snd
112110renderHeader :: Table -> [Int] -> StringType
113111renderHeader (header, body) columnLocations = renderTopBar `T.append` renderHeaderNames `T.append` renderBottomBar
114112 where
115− renderTopBar = boxTL `T.append` T.concat (L.intersperse boxTB (map (\x -> repeatString x boxH) columnLocations)) `T.append` boxTR `T.append` "\n"
113+ renderTopBar = boxTL `T.append` T.concat (L.intersperse boxTB (map (`repeatString` boxH) columnLocations)) `T.append` boxTR `T.append` "\n"
116114 renderHeaderNames = renderRow header columnLocations 1 boxV
117− renderBottomBar = if length body == 0 then ""
115+ renderBottomBar = if null body then ""
118116 else renderHBar boxLB boxC boxRB columnLocations `T.append` "\n"
119117
120118renderHBar :: StringType -> StringType -> StringType -> [Int] -> StringType
121−renderHBar left middle end columnLocations = left `T.append` T.concat (L.intersperse middle (map (\x -> repeatString x boxH) columnLocations)) `T.append` end
119+renderHBar left middle end columnLocations = left `T.append` T.concat (L.intersperse middle (map (`repeatString` boxH) columnLocations)) `T.append` end
122120
121+--pad a block of potentially multi-lined text
123122leftPaddedString :: Int -> Int -> StringType -> StringType
124123leftPaddedString lineNum size str = if lineNum > length paddedLines -1 then
125124 repeatString size " "
126125 else
127126 paddedLines !! lineNum
128127 where
129− paddedLines = map (\line -> line `T.append` repeatString (size - T.length line) " ") (breakLines str)
128+ paddedLines = map (\line -> line `T.append` repeatString (size - stringDisplayLength line) " ") (breakLines str)
130129
131130renderRow :: [Cell] -> [Int] -> Int -> StringType -> StringType
132131renderRow cells columnLocations rowHeight interspersed = T.unlines $ map renderOneLine [0..rowHeight-1]
133132 where
134− renderOneLine lineNum = boxV `T.append` T.concat (L.intersperse interspersed (map (\(size, value) -> leftPaddedString lineNum size value) (zip columnLocations cells))) `T.append` boxV
133+ renderOneLine lineNum = boxV `T.append` T.concat (L.intersperse interspersed (zipWith (leftPaddedString lineNum) columnLocations cells)) `T.append` boxV
135134
136135renderBody :: [[Cell]] -> ([Int],[Int]) -> StringType
137136renderBody cellMatrix cellLocs = renderRows `T.append` renderBottomBar
@@ -142,14 +141,19 @@ renderBody cellMatrix cellLocs = renderRows `T.append` renderBottomBar
142141 rowHeightMatrix = zip cellMatrix (tail rowLocations)
143142 renderBottomBar = renderHBar boxBL boxBB boxBR columnLocations
144143
145−orderedAttributes :: Relation -> [Attribute]
146−orderedAttributes rel = L.sortBy (\a b -> attributeName a `compare` attributeName b) (V.toList (attributes rel))
147−
148−orderedAttributeNames :: Relation -> [AttributeName]
149−orderedAttributeNames rel = map attributeName (orderedAttributes rel)
150−
151144repeatString :: Int -> StringType -> StringType
152−repeatString c s = T.concat (take c (repeat s))
145+repeatString c s = T.concat (replicate c s)
153146
154147showRelation :: Relation -> StringType
155148showRelation rel = renderTable (relationAsTable rel)
149+
150+--use wcwidth to guess the string width in the terminal- many CJK characters can take multiple columns in a fixed width font
151+stringDisplayLength :: StringType -> Int
152+stringDisplayLength = T.foldr charSize 0
153+ where
154+ charSize char accum = let w = wcwidth char in
155+ accum + if w < 0 then
156+ 1
157+ else
158+ w
159+
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