8832366...master · type-fun

.gitignore+1

@@ -2,3 +2,4 @@ dist

22TAGS

33.cabal-sandbox

44cabal.sandbox.config

5+.stack-work

CHANGELOG.md+15

@@ -4,5 +4,20 @@

44

55# CHANGELOG

66

7+## 0.1.2

8+### Added KnownPeano

9+

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+

722## 0.0.1

823First 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/Data/List.hs+24

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

3535 , UnionList

3636 , AppendUniq

3737 , Intersect

38+ , Substract

3839 -- * Uniqueness checking

3940 , ElementIsUniq

4041 , UniqElements

4142 , UniqElements'

43+ -- * Unsafe helpers

44+ , appendId

45+ , subListId

4246 ) where

4347

4448import Data.Type.Bool

@@ -47,6 +51,7 @@ import GHC.TypeLits

4751import TypeFun.Data.Eq

4852import TypeFun.Data.Maybe

4953import TypeFun.Data.Peano

54+import Unsafe.Coerce

5055

5156------------------------------------------------------------------------

5257-- NOTE: Errors type classes. These type classes are not in separate --

@@ -103,6 +108,13 @@ type family (:++:) (a :: [k]) (b :: [k]) :: [k] where

103108 '[] :++: b = b

104109 (a ': as) :++: b = a ': (as :++: b)

105110

111+appendId

112+ :: forall proxy l r

113+ . proxy l

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

115+ -> r

116+appendId = unsafeCoerce id

117+

106118type IndexOf a s = FromJust (IndexOfMay a s)

107119

108120type IndexOfMay a s = IndexOfMay' Z a s

@@ -156,6 +168,12 @@ type family SubList (a :: [k]) (b :: [k]) :: Constraint where

156168 SubList '[] bs = ()

157169 SubList (a ': as) bs = (Elem a bs, SubList as bs)

158170

171+subListId

172+ :: forall proxy l r

173+ . proxy l

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

175+subListId _ = unsafeCoerce id

176+

159177type family NotSubList (a :: [k]) (b :: [k]) :: Constraint where

160178 NotSubList '[] bs = ()

161179 NotSubList (a ': as) bs = (NotElem a bs, NotSubList as bs)

@@ -195,6 +213,12 @@ type family AppendUniq (a :: k) (s :: [k]) :: [k] where

195213-- taken from first list

196214type Intersect a b = (Indices (CatMaybes (IndicesOfMay a b)) b)

197215

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+

198222-- | Checks that element 'a' occurs in a list just once

199223type ElementIsUniq a s = If (Equal (S Z) (Count a s))

200224 (() :: Constraint)

src/TypeFun/Data/Peano.hs+14−3

@@ -1,5 +1,6 @@

11module TypeFun.Data.Peano

22 ( N(..)

3+ , KnownPeano(..)

34 , ToNat

45 , FromNat

56 , (:+:)

@@ -7,14 +8,24 @@ module TypeFun.Data.Peano

78 , (:*:)

89 ) where

910

10−import Data.Typeable

11−import GHC.Generics (Generic)

12−import GHC.TypeLits

11+import Data.Typeable

12+import GHC.Generics (Generic)

13+import GHC.TypeLits

1314

1415data N = Z | S N

1516 deriving ( Eq, Ord, Read, Show

1617 , Generic, Typeable )

1718

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+

1829type family ToNat (a :: N) :: Nat where

1930 ToNat Z = 0

2031 ToNat (S a) = 1 + (ToNat a)

stack.yamlnew file+9

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

1+nix:

2+ packages:

3+ - zlib

4+ - postgresql

5+

6+resolver: lts-13.21

7+

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

5+

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