| Line No. | Rev | Author | Line |
|---|---|---|---|
| 1 | 1 | paulosilva | |
| 2 | {-# LANGUAGE GADTs, FlexibleContexts, MultiParamTypeClasses #-} | ||
| 3 | {-# OPTIONS_GHC -Wall #-} | ||
| 4 | |||
| 5 | ------------------------------------------------------------------------------- | ||
| 6 | |||
| 7 | {- | | ||
| 8 | Module : Language.R.SafeCast | ||
| 9 | Description : Type safe cast for the expression 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 | module Language.R.SafeCast ( | ||
| 22 | rCast | ||
| 23 | ) where | ||
| 24 | |||
| 25 | import Control.GalcError | ||
| 26 | import Control.Monad.Error | ||
| 27 | import Data.Equal | ||
| 28 | import Data.Existential | ||
| 29 | import Language.R.Syntax | ||
| 30 | import Language.Type.Constraint | ||
| 31 | import Language.Type.Equality | ||
| 32 | import Language.Type.Syntax | ||
| 33 | |||
| 34 | ------------------------------------------------------------------------------- | ||
| 35 | |||
| 36 | 7 | paulosilva | rCast :: MonadError GalcError m |
| 37 | 1 | paulosilva | => [Constraint] -> Type t -> R r -> m (R t) |
| 38 | rCast _ (Rel _ _) BOT = return BOT | ||
| 39 | rCast _ (Rel _ _) TOP = return TOP | ||
| 40 | rCast c (Rel t1 t2) (NEG r) = do | ||
| 41 | r' <- rCast c (Rel t1 t2) r | ||
| 42 | return $ NEG r' | ||
| 43 | rCast c (Rel t1 t2) (MEET r1 r2) = do | ||
| 44 | r1' <- rCast c (Rel t1 t2) r1 | ||
| 45 | r2' <- rCast c (Rel t1 t2) r2 | ||
| 46 | return $ MEET r1' r2' | ||
| 47 | rCast c (Rel t1 t2) (JOIN r1 r2) = do | ||
| 48 | r1' <- rCast c (Rel t1 t2) r1 | ||
| 49 | r2' <- rCast c (Rel t1 t2) r2 | ||
| 50 | return $ JOIN r1' r2' | ||
| 51 | rCast _ (Rel t1 t2) ID = do | ||
| 52 | 7 | paulosilva | Eq <- teqE t1 t2 |
| 53 | 1 | paulosilva | return ID |
| 54 | rCast c (Rel t1 t2) (CONV r1) = do | ||
| 55 | r1' <- rCast c (Rel t2 t1) r1 | ||
| 56 | return $ CONV r1' | ||
| 57 | rCast c (Rel t1 t2) (COMP t r1 r2) = do | ||
| 58 | 7 | paulosilva | Hide t' <- typeRewriteE c t |
| 59 | 1 | paulosilva | r1' <- rCast c (Rel t1 t') r1 |
| 60 | r2' <- rCast c (Rel t' t2) r2 | ||
| 61 | return $ COMP t' r1' r2' | ||
| 62 | rCast c (Rel (Prod t2 t3) t1) (SPLIT r1 r2) = do | ||
| 63 | r1' <- rCast c (Rel t2 t1) r1 | ||
| 64 | r2' <- rCast c (Rel t3 t1) r2 | ||
| 65 | return $ SPLIT r1' r2' | ||
| 66 | rCast c (Rel t1 t2) (ORD r) = do | ||
| 67 | 7 | paulosilva | Eq <- teqE t1 t2 |
| 68 | 1 | paulosilva | r' <- rCast c (Ord t1) r |
| 69 | return $ ORD r' | ||
| 70 | rCast c (Rel t2 t1) (FUN f) = do | ||
| 71 | f' <- rCast c (Fun t2 t1) f | ||
| 72 | return $ FUN f' | ||
| 73 | rCast c (Fun t1 t3) (LEFTSEC t2 f s) = do | ||
| 74 | 7 | paulosilva | Hide t2' <- typeRewriteE c t2 |
| 75 | 1 | paulosilva | f' <- rCast c (Fun t1 (Prod t2' t3)) f |
| 76 | s' <- rCast c t2' s | ||
| 77 | return $ LEFTSEC t2' f' s' | ||
| 78 | rCast c (Fun t1 t2) (RIGHTSEC t3 f s) = do | ||
| 79 | 7 | paulosilva | Hide t3' <- typeRewriteE c t3 |
| 80 | 1 | paulosilva | f' <- rCast c (Fun t1 (Prod t2 t3')) f |
| 81 | s' <- rCast c t3' s | ||
| 82 | return $ RIGHTSEC t3' f' s' | ||
| 83 | rCast c t1 (APPLY t2 f v) = do | ||
| 84 | 7 | paulosilva | Hide t2' <- typeRewriteE c t2 |
| 85 | 1 | paulosilva | v' <- rCast c t2' v |
| 86 | f' <- rCast c (Fun t1 t2') f | ||
| 87 | return $ APPLY t2' f' v' | ||
| 88 | rCast c ta (DEF n tb) = do | ||
| 89 | 7 | paulosilva | Hide tb' <- typeRewriteE c tb |
| 90 | Eq <- teqE tb' ta | ||
| 91 | 1 | paulosilva | return $ DEF n ta |
| 92 | rCast _ _ (Var n) = return (Var n) | ||
| 93 | rCast c (Rel (Prod t2' t1') (Prod t2 t1)) (PROD r2 r1) = do | ||
| 94 | r1' <- rCast c (Rel t1' t1) r1 | ||
| 95 | r2' <- rCast c (Rel t2' t2) r2 | ||
| 96 | return $ PROD r2' r1' | ||
| 97 | rCast c (Rel (Either t2' t1') (Either t2 t1)) (EITHER r2 r1) = do | ||
| 98 | r1' <- rCast c (Rel t1' t1) r1 | ||
| 99 | r2' <- rCast c (Rel t2' t2) r2 | ||
| 100 | return $ EITHER r2' r1' | ||
| 101 | rCast c (Rel (Maybe b) (Maybe a)) (MAYBE r) = do | ||
| 102 | r' <- rCast c (Rel b a) r | ||
| 103 | return $ MAYBE r' | ||
| 104 | rCast c (Rel (List b) (List a)) (LIST r) = do | ||
| 105 | r' <- rCast c (Rel b a) r | ||
| 106 | return $ LIST r' | ||
| 107 | rCast c (Rel (Set b) (Set a)) (SET r) = do | ||
| 108 | r' <- rCast c (Rel b a) r | ||
| 109 | return $ SET r' | ||
| 110 | rCast c (Rel (Map k b) (Map k' a)) (MAP r) = do | ||
| 111 | 7 | paulosilva | Eq <- teqE k k' |
| 112 | 1 | paulosilva | r' <- rCast c (Rel b a) r |
| 113 | return $ MAP r' | ||
| 114 | 5 | paulosilva | rCast c (Rel (Fun t2 t4) (Fun t1 t3)) (REYNOLDS r2 r1) = do |
| 115 | r1' <- rCast c (Rel t4 t3) r1 | ||
| 116 | r2' <- rCast c (Rel t2 t1) r2 | ||
| 117 | return $ REYNOLDS r2' r1' | ||
| 118 | 1 | paulosilva | rCast _ (Fun t1 t2) FId = do |
| 119 | 7 | paulosilva | Eq <- teqE t1 t2 |
| 120 | 1 | paulosilva | return FId |
| 121 | rCast c (Fun t1 t3) (FComp t2 f1 f2) = do | ||
| 122 | 7 | paulosilva | Hide t2' <- typeRewriteE c t2 |
| 123 | 1 | paulosilva | f1' <- rCast c (Fun t1 t2') f1 |
| 124 | f2' <- rCast c (Fun t2' t3) f2 | ||
| 125 | return $ FComp t2' f1' f2' | ||
| 126 | rCast _ (Ord _) OId = return OId | ||
| 127 | rCast c (Ord t) (OComp o1 o2) = do | ||
| 128 | o1' <- rCast c (Ord t) o1 | ||
| 129 | o2' <- rCast c (Ord t) o2 | ||
| 130 | return $ OComp o1' o2' | ||
| 131 | rCast c (Ord t) (OConv o) = do | ||
| 132 | o' <- rCast c (Ord t) o | ||
| 133 | return $ OConv o' | ||
| 134 | rCast c (Ord (Prod a a')) (OProd o) = do | ||
| 135 | 7 | paulosilva | Eq <- teqE a a' |
| 136 | 1 | paulosilva | o' <- rCast c (Ord a) o |
| 137 | return $ OProd o' | ||
| 138 | rCast c (Fun t1 (Prod t2 t3)) (OJoin o) = do | ||
| 139 | 7 | paulosilva | Eq <- teqE t1 t2 |
| 140 | Eq <- teqE t2 t3 | ||
| 141 | 1 | paulosilva | o' <- rCast c (Ord t1) o |
| 142 | return $ OJoin o' | ||
| 143 | rCast c (Fun t1 (Prod t2 t3)) (OMeet o) = do | ||
| 144 | 7 | paulosilva | Eq <- teqE t1 t2 |
| 145 | Eq <- teqE t2 t3 | ||
| 146 | 1 | paulosilva | o' <- rCast c (Ord t1) o |
| 147 | return $ OMeet o' | ||
| 148 | rCast c t (OMax o) = do | ||
| 149 | o' <- rCast c (Ord t) o | ||
| 150 | return $ OMax o' | ||
| 151 | rCast c t (OMin o) = do | ||
| 152 | o' <- rCast c (Ord t) o | ||
| 153 | return $ OMin o' | ||
| 154 | rCast c (GC t1 t2) (GDef n f1 f2 o1 o2) = do | ||
| 155 | f1' <- rCast c (Fun t1 t2) f1 | ||
| 156 | f2' <- rCast c (Fun t2 t1) f2 | ||
| 157 | o1' <- rCast c (Ord t1) o1 | ||
| 158 | o2' <- rCast c (Ord t2) o2 | ||
| 159 | return $ GDef n f1' f2' o1' o2' | ||
| 160 | rCast _ (GC t1 t2) GId = do | ||
| 161 | 7 | paulosilva | Eq <- teqE t1 t2 |
| 162 | 1 | paulosilva | return $ GId |
| 163 | rCast c (GC t1 t3) (GComp t2 g1 g2) = do | ||
| 164 | 7 | paulosilva | Hide t2' <- typeRewriteE c t2 |
| 165 | 1 | paulosilva | g1' <- rCast c (GC t1 t2') g1 |
| 166 | g2' <- rCast c (GC t2' t3) g2 | ||
| 167 | return $ GComp t2' g1' g2' | ||
| 168 | rCast c (GC t1 t2) (GConv g) = do | ||
| 169 | g' <- rCast c (GC t2 t1) g | ||
| 170 | return $ GConv g' | ||
| 171 | rCast c (Fun t1 t2) (GLAdj g) = do | ||
| 172 | g' <- rCast c (GC t1 t2) g | ||
| 173 | return $ GLAdj g' | ||
| 174 | rCast c (Fun t1 t2) (GUAdj g) = do | ||
| 175 | g' <- rCast c (GC t2 t1) g | ||
| 176 | return $ GUAdj g' | ||
| 177 | rCast c (Ord t1) (GLOrd t2 g) = do | ||
| 178 | 7 | paulosilva | Hide t2' <- typeRewriteE c t2 |
| 179 | 1 | paulosilva | g' <- rCast c (GC t1 t2') g |
| 180 | return $ GLOrd t2' g' | ||
| 181 | rCast c (Ord t1) (GUOrd t2 g) = do | ||
| 182 | 7 | paulosilva | Hide t2' <- typeRewriteE c t2 |
| 183 | 1 | paulosilva | g' <- rCast c (GC t2' t1) g |
| 184 | return $ GUOrd t2' g' | ||
| 185 | rCast _ t r = throwError $ CastingError (show r, show t) | ||
| 186 | |||
| 187 | ------------------------------------------------------------------------------- |