| Line No. | Rev | Author | Line |
|---|---|---|---|
| 1 | 1 | paulosilva | |
| 2 | 7 | paulosilva | {-# LANGUAGE GADTs, FlexibleContexts #-} |
| 3 | 1 | paulosilva | {-# OPTIONS_GHC -Wall #-} |
| 4 | |||
| 5 | ------------------------------------------------------------------------------- | ||
| 6 | |||
| 7 | {- | | ||
| 8 | Module : Language.Type.Equality | ||
| 9 | Description : Equality definition over the type representation. | ||
| 10 | Copyright : (c) Paulo Silva | ||
| 11 | License : LGPL | ||
| 12 | |||
| 13 | Maintainer : paufil@di.uminho.pt | ||
| 14 | Stability : experimental | ||
| 15 | Portability : portable | ||
| 16 | |||
| 17 | -} | ||
| 18 | |||
| 19 | ------------------------------------------------------------------------------- | ||
| 20 | |||
| 21 | |||
| 22 | module Language.Type.Equality ( | ||
| 23 | teq, | ||
| 24 | 7 | paulosilva | teqE, |
| 25 | 1 | paulosilva | teq', |
| 26 | beq, | ||
| 27 | beq' | ||
| 28 | ) where | ||
| 29 | |||
| 30 | 7 | paulosilva | import Control.GalcError |
| 31 | import Control.MonadOr | ||
| 32 | import Control.Monad.Error | ||
| 33 | 1 | paulosilva | import Data.Equal |
| 34 | import {-# SOURCE #-} Language.Type.Syntax | ||
| 35 | |||
| 36 | ------------------------------------------------------------------------------- | ||
| 37 | |||
| 38 | 7 | paulosilva | teqE :: MonadError GalcError m => Type a -> Type b -> m (Equal a b) |
| 39 | teqE t1 t2 = maybe2error EqualityError $ teq t1 t2 | ||
| 40 | |||
| 41 | teq :: MonadOr m => Type a -> Type b -> m (Equal a b) | ||
| 42 | 1 | paulosilva | teq (TVar n1) (TVar n2) = do |
| 43 | guard (n1 == n2) | ||
| 44 | return Eq | ||
| 45 | teq One One = return Eq | ||
| 46 | teq Bool Bool = return Eq | ||
| 47 | teq Char Char = return Eq | ||
| 48 | teq String String = return Eq | ||
| 49 | teq Int Int = return Eq | ||
| 50 | teq Float Float = return Eq | ||
| 51 | teq (Prod a b) (Prod a' b') = do | ||
| 52 | Eq <- teq a a' | ||
| 53 | Eq <- teq b b' | ||
| 54 | return Eq | ||
| 55 | teq (Either a b) (Either a' b') = do | ||
| 56 | Eq <- teq a a' | ||
| 57 | Eq <- teq b b' | ||
| 58 | return Eq | ||
| 59 | teq (Maybe a) (Maybe a') = do | ||
| 60 | Eq <- teq a a' | ||
| 61 | return Eq | ||
| 62 | teq (List a) (List a') = do | ||
| 63 | Eq <- teq a a' | ||
| 64 | return Eq | ||
| 65 | teq (Set a) (Set a') = do | ||
| 66 | Eq <- teq a a' | ||
| 67 | return Eq | ||
| 68 | teq (Map a b) (Map a' b') = do | ||
| 69 | Eq <- teq a a' | ||
| 70 | Eq <- teq b b' | ||
| 71 | return Eq | ||
| 72 | teq (Fun b a) (Fun b' a') = do | ||
| 73 | Eq <- teq a a' | ||
| 74 | Eq <- teq b b' | ||
| 75 | return Eq | ||
| 76 | teq (Rel b a) (Rel b' a') = do | ||
| 77 | Eq <- teq a a' | ||
| 78 | Eq <- teq b b' | ||
| 79 | return Eq | ||
| 80 | teq (Ord a) (Ord a') = do | ||
| 81 | Eq <- teq a a' | ||
| 82 | return Eq | ||
| 83 | teq (GC b a) (GC b' a') = do | ||
| 84 | Eq <- teq a a' | ||
| 85 | Eq <- teq b b' | ||
| 86 | return Eq | ||
| 87 | teq _ _ = mzero | ||
| 88 | |||
| 89 | ------------------------------------------------------------------------------- | ||
| 90 | |||
| 91 | teq' :: MonadPlus m => Type a -> Type b -> m (Equal a b) | ||
| 92 | teq' (TVar _) (TVar _) = do | ||
| 93 | return Eq | ||
| 94 | teq' One One = return Eq | ||
| 95 | teq' Bool Bool = return Eq | ||
| 96 | teq' Char Char = return Eq | ||
| 97 | teq' String String = return Eq | ||
| 98 | teq' Int Int = return Eq | ||
| 99 | teq' Float Float = return Eq | ||
| 100 | teq' (Prod a b) (Prod a' b') = do | ||
| 101 | Eq <- teq' a a' | ||
| 102 | Eq <- teq' b b' | ||
| 103 | return Eq | ||
| 104 | teq' (Either a b) (Either a' b') = do | ||
| 105 | Eq <- teq' a a' | ||
| 106 | Eq <- teq' b b' | ||
| 107 | return Eq | ||
| 108 | teq' (Maybe a) (Maybe a') = do | ||
| 109 | Eq <- teq' a a' | ||
| 110 | return Eq | ||
| 111 | teq' (List a) (List a') = do | ||
| 112 | Eq <- teq' a a' | ||
| 113 | return Eq | ||
| 114 | teq' (Set a) (Set a') = do | ||
| 115 | Eq <- teq' a a' | ||
| 116 | return Eq | ||
| 117 | teq' (Map a b) (Map a' b') = do | ||
| 118 | Eq <- teq' a a' | ||
| 119 | Eq <- teq' b b' | ||
| 120 | return Eq | ||
| 121 | teq' (Fun b a) (Fun b' a') = do | ||
| 122 | Eq <- teq' a a' | ||
| 123 | Eq <- teq' b b' | ||
| 124 | return Eq | ||
| 125 | teq' (Rel b a) (Rel b' a') = do | ||
| 126 | Eq <- teq' a a' | ||
| 127 | Eq <- teq' b b' | ||
| 128 | return Eq | ||
| 129 | teq' (Ord a) (Ord a') = do | ||
| 130 | Eq <- teq' a a' | ||
| 131 | return Eq | ||
| 132 | teq' (GC b a) (GC b' a') = do | ||
| 133 | Eq <- teq' a a' | ||
| 134 | Eq <- teq' b b' | ||
| 135 | return Eq | ||
| 136 | teq' _ _ = mzero | ||
| 137 | |||
| 138 | ------------------------------------------------------------------------------- | ||
| 139 | |||
| 140 | beq :: Type a -> Type b -> Bool | ||
| 141 | beq a a' = maybe False (const True) (teq a a') | ||
| 142 | |||
| 143 | ------------------------------------------------------------------------------- | ||
| 144 | |||
| 145 | beq' :: Type a -> Type b -> Bool | ||
| 146 | beq' a a' = maybe False (const True) (teq' a a') | ||
| 147 | |||
| 148 | ------------------------------------------------------------------------------- |