4819b04..master · type-fun

git.iko.soy/type-fun

11 files changed+133−18

unifiedsplit

.gitignore+3 CHANGELOG.md+23 example/Main.hs+1 src/TypeFun/Constraint.hs+4−1 src/TypeFun/Data/Eq.hs+3−1 src/TypeFun/Data/List.hs+36 src/TypeFun/Data/Maybe.hs+8−2 src/TypeFun/Data/Peano.hs+22−4 stack.yaml+9 stack.yaml.lock+12 type-fun.cabal+12−10

.gitignore+3

@@ -1,2 +1,5 @@

11dist

22TAGS

3+.cabal-sandbox

4+cabal.sandbox.config

5+.stack-work

CHANGELOG.mdnew file+23

@@ -0,0 +1,23 @@

1+# TODO

2+* Add doctests

3+* Add TyFun from singletons (or just depend from)?

5+# CHANGELOG

7+## 0.1.2

8+### Added KnownPeano

10+## 0.1.1

11+### Fixed

12+* Compilable with ghc-8.0.1

13+

14+## 0.1.0

15+### Added

16+* Type family `Substract` to remove elements of one list from another

17+* Unsafe helper functions to relax constraints in some safe points. But we use

18+ `unsafeCoerce` so this functions are potentially just break constants

19+### Changed

20+* Compilable under ghc-7.8

21+

22+## 0.0.1

23+First version

example/Main.hs+1

@@ -37,4 +37,5 @@ main = do

3737 print $ prefixConstr p2

3838 print $ prefixConstr p3

3939 print $ uniqConstr p2

40+ print $ peanoVal (Proxy :: Proxy (FromNat 100))

4041 -- print $ uniqConstr p3 -- < ElementIsNotUniqInList Int '[Int, Bool, Int]

src/TypeFun/Constraint.hs+4−1

@@ -1,7 +1,10 @@

1−module TypeFun.Constraint where

1+module TypeFun.Constraint

2+ ( AllSatisfy

3+ ) where

35import GHC.Exts

7+-- | Apply constraint for each element of list

58type family AllSatisfy (c :: k -> Constraint) (s :: [k]) :: Constraint where

69 AllSatisfy c '[] = ()

710 AllSatisfy c (a ': as) = (c a, AllSatisfy c as)

src/TypeFun/Data/Eq.hs+3−1

@@ -1,4 +1,6 @@

1−module TypeFun.Data.Eq where

1+module TypeFun.Data.Eq

2+ ( Equal

3+ ) where

35type family Equal (a :: k) (b :: k) :: Bool where

46 Equal a a = 'True

src/TypeFun/Data/List.hs+36

@@ -9,6 +9,8 @@ module TypeFun.Data.List

99 , Drop

1010 , Take

1111 , Delete

12+ , Remove

13+ , (:++:)

1214 -- * Elements lookup

1315 , IndexOf

1416 , IndexOfMay

@@ -33,10 +35,14 @@ module TypeFun.Data.List

3335 , UnionList

3436 , AppendUniq

3537 , Intersect

38+ , Substract

3639 -- * Uniqueness checking

3740 , ElementIsUniq

3841 , UniqElements

3942 , UniqElements'

43+ -- * Unsafe helpers

44+ , appendId

45+ , subListId

4046 ) where

4147

4248import Data.Type.Bool

@@ -45,6 +51,7 @@ import GHC.TypeLits

4551import TypeFun.Data.Eq

4652import TypeFun.Data.Maybe

4753import TypeFun.Data.Peano

54+import Unsafe.Coerce

4855

4956------------------------------------------------------------------------

5057-- NOTE: Errors type classes. These type classes are not in separate --

@@ -91,6 +98,23 @@ type family Delete (a :: k) (s :: [k]) :: [k] where

9198 Delete a (a ': as) = Delete a as

9299 Delete a (b ': as) = b ': (Delete a as)

93100

101+-- | Remove index from the list

102+type family Remove (i :: N) (a :: [k]) :: [k] where

103+ Remove i '[] = '[]

104+ Remove 'Z (a ': as) = as

105+ Remove ('S i) (a ': as) = a ': (Remove i as)

106+

107+type family (:++:) (a :: [k]) (b :: [k]) :: [k] where

108+ '[] :++: b = b

109+ (a ': as) :++: b = a ': (as :++: b)

110+

111+appendId

112+ :: forall proxy l r

113+ . proxy l

114+ -> (l ~ (l :++: '[]) => r)

115+ -> r

116+appendId = unsafeCoerce id

117+

94118type IndexOf a s = FromJust (IndexOfMay a s)

95119

96120type IndexOfMay a s = IndexOfMay' Z a s

@@ -144,6 +168,12 @@ type family SubList (a :: [k]) (b :: [k]) :: Constraint where

144168 SubList '[] bs = ()

145169 SubList (a ': as) bs = (Elem a bs, SubList as bs)

146170

171+subListId

172+ :: forall proxy l r

173+ . proxy l

174+ -> (SubList l l => r) -> r

175+subListId _ = unsafeCoerce id

176+

147177type family NotSubList (a :: [k]) (b :: [k]) :: Constraint where

148178 NotSubList '[] bs = ()

149179 NotSubList (a ': as) bs = (NotElem a bs, NotSubList as bs)

@@ -183,6 +213,12 @@ type family AppendUniq (a :: k) (s :: [k]) :: [k] where

183213-- taken from first list

184214type Intersect a b = (Indices (CatMaybes (IndicesOfMay a b)) b)

185215

216+-- | Removes from first list all elements occured in second

217+type family Substract (a :: [k]) (b :: [k]) :: [k] where

218+ Substract '[] b = '[]

219+ Substract a '[] = a

220+ Substract a (b ': bs) = Substract (Delete b a) bs

221+

186222-- | Checks that element 'a' occurs in a list just once

187223type ElementIsUniq a s = If (Equal (S Z) (Count a s))

188224 (() :: Constraint)

src/TypeFun/Data/Maybe.hs+8−2

@@ -1,4 +1,10 @@

1−module TypeFun.Data.Maybe where

1+module TypeFun.Data.Maybe

2+ ( MaybeCase

3+ , NothingToConstr

4+ , JustToConstr

5+ , CatMaybes

6+ , FromJust

7+ ) where

39import GHC.Exts

410

@@ -8,7 +14,6 @@ type family MaybeCase (a :: Maybe k)

814 MaybeCase 'Nothing nothing just = nothing

915 MaybeCase ('Just k) nothing just = just k

1016

11−

1217type family NothingToConstr (a :: Maybe k) (c :: Constraint) :: Constraint where

1318 NothingToConstr 'Nothing c = c

1419 NothingToConstr ('Just a) c = ()

@@ -17,6 +22,7 @@ type family JustToConstr (a :: Maybe k) (c :: Constraint) :: Constraint where

1722 JustToConstr 'Nothing c = ()

1823 JustToConstr ('Just a) c = c

1924

25+-- | Like 'catMaybes' for type lists

2026type family CatMaybes (l :: [Maybe k]) :: [k] where

2127 CatMaybes '[] = '[]

2228 CatMaybes (('Just a) ': as) = a ': (CatMaybes as)

src/TypeFun/Data/Peano.hs+22−4

@@ -1,13 +1,31 @@

1−module TypeFun.Data.Peano where

1+module TypeFun.Data.Peano

2+ ( N(..)

3+ , KnownPeano(..)

4+ , ToNat

5+ , FromNat

6+ , (:+:)

7+ , (:-:)

8+ , (:*:)

9+ ) where

210

3−import Data.Typeable

4−import GHC.Generics (Generic)

5−import GHC.TypeLits

11+import Data.Typeable

12+import GHC.Generics (Generic)

13+import GHC.TypeLits

614

715data N = Z | S N

816 deriving ( Eq, Ord, Read, Show

917 , Generic, Typeable )

1018

19+-- | @since 0.1.2

20+class KnownPeano (p :: N) where

21+ peanoVal :: proxy p -> Integer

22+

23+instance KnownPeano Z where

24+ peanoVal _ = 0

25+

26+instance (KnownPeano n) => KnownPeano (S n) where

27+ peanoVal _ = succ $ peanoVal (Proxy :: Proxy n)

28+

1129type family ToNat (a :: N) :: Nat where

1230 ToNat Z = 0

1331 ToNat (S a) = 1 + (ToNat a)

stack.yamlnew file+9

@@ -0,0 +1,9 @@

1+nix:

2+ packages:

3+ - zlib

4+ - postgresql

6+resolver: lts-13.21

8+packages:

9+ - .

stack.yaml.locknew file+12

@@ -0,0 +1,12 @@

1+# This file was autogenerated by Stack.

2+# You should not edit this file by hand.

3+# For more information, please see the documentation at:

4+# https://docs.haskellstack.org/en/stable/lock_files

6+packages: []

7+snapshots:

8+- completed:

9+ size: 498180

10+ url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/13/21.yaml

11+ sha256: eff2de19a6d4691ccbf6edc1fba858f1918683047dce0f09adede874bbd2a8f3

12+ original: lts-13.21

type-fun.cabal+12−10

@@ -1,29 +1,31 @@

1−-- Initial type-fun.cabal generated by cabal init. For further

2−-- documentation, see http://haskell.org/cabal/users-guide/

3−

41name: type-fun

5−version: 0.0.1

2+version: 0.1.2

63synopsis: Collection of widely reimplemented type families

7−-- description:

84license: BSD3

95license-file: LICENSE

106author: Aleksey Uimanov

117maintainer: s9gf4ult@gmail.com

12−-- copyright:

138category: Dependent Types

149build-type: Simple

15−-- extra-source-files:

10+extra-source-files: CHANGELOG.md

1611cabal-version: >=1.10

12+homepage: https://github.com/s9gf4ult/type-fun

13+source-repository head

14+ type: git

15+ location: git@github.com:s9gf4ult/type-fun.git

1716

1817library

1918 default-language: Haskell2010

2019 hs-source-dirs: src

2120 default-extensions: ConstraintKinds

2221 , DataKinds

22+ , DeriveDataTypeable

2323 , DeriveGeneric

2424 , FlexibleInstances

2525 , MultiParamTypeClasses

2626 , PolyKinds

27+ , RankNTypes

28+ , ScopedTypeVariables

2729 , TypeFamilies

2830 , TypeOperators

2931 , UndecidableInstances

@@ -34,15 +36,15 @@ library

3436 , TypeFun.Data.Maybe

3537 , TypeFun.Data.Peano

3638

37− build-depends: base >=4.7 && <4.9

38−

39+ build-depends: base >= 4.7 && < 5

3940

4041test-suite example

4142 type: exitcode-stdio-1.0

4243 default-language: Haskell2010

4344 hs-source-dirs: example

4445 main-is: Main.hs

45− default-extensions: DataKinds

46+ default-extensions: ConstraintKinds

47+ , DataKinds

4648 , GADTs

4749 , TemplateHaskell

4850 , TypeFamilies