import StdTuple
import StdList
import StdBool
+import GenEq
from Text import class Text(concat), instance Text String
instance MonadTrans (StateT Gamma) where
liftT m = StateT \s-> m >>= \a-> return (a, s)
-get = gets id
+get :== gets id
sem :: AST -> SemOutput
sem (AST vd fd) = case runStateT m ('Map'.newMap, getRandomStream 1) of
Right ((vds, fds), gamma) = Right ((AST vds fds), gamma)
where
m :: Env ([VarDecl], [FunDecl])
- m = mapM semVarDecl vd >>= \vds ->
- mapM semFunDecl fd >>= \fds1 ->
- mapM semFunDecl fds1 >>= \fds2 ->
- pure (vds, fds2)
+ m = mapM semVarDecl vd >>= \vd1 ->
+ mapM semFunDecl fd >>= \fd1 ->
+ mapM semVarDecl vd1 >>= \vd2 ->
+ mapM semFunDecl fd1 >>= \fd2 ->
+ mapM semVarDecl vd2 >>= \vd3 ->
+ mapM semFunDecl fd2 >>= \fd3 ->
+ mapM semVarDecl vd3 >>= \vd4 ->
+ mapM semFunDecl fd3 >>= \fd4 -> //Dit is puur om te proberen
+ pure (vd4, fd4)
semFunDecl :: FunDecl -> Env FunDecl
semFunDecl fd=:(FunDecl p f args mt vds stmts) =
matchFunctions args ft >>= \tres->
mapM semVarDecl vds >>= \newvds->
mapM (checkStmt tres) stmts >>= \newstmts->
- pure IntType >>= \returntype->
case mt of
- Nothing = reconstructType args returntype
- >>= \ftype->restoreGamma gamma
+ Nothing = inferReturnType stmts
+ >>= \returntype->reconstructType args tres
+ >>= \ftype->restoreGamma gamma
>>| putIdent f ftype >>| pure (
- FunDecl p f args (Just ftype) newvds newstmts)
+ FunDecl p f args (Just ftype) newvds newstmts)
Just t = restoreGamma gamma
>>| pure (FunDecl p f args mt newvds newstmts)
+inferReturnType :: [Stmt] -> Env Type
+inferReturnType [] = pure VoidType
+inferReturnType [ReturnStmt (Just t):rest] = typeExpr t
+inferReturnType [ReturnStmt _:rest] = pure VoidType
+inferReturnType [_:rest] = inferReturnType rest
+
reconstructType :: [String] Type -> Env Type
reconstructType [] t = pure t
reconstructType [x:xs] t = gets (\(st, r)->'Map'.get x st)
>>= \st1-> mapM (checkStmt t) se >>= \se1-> pure (IfStmt c st1 se1)
checkStmt t w=:(WhileStmt c et) = unify BoolType c >>| mapM (checkStmt t) et
>>= \et1-> pure w
-checkStmt t (AssStmt (VarDef ident fs) e) = undef
+checkStmt t a=:(AssStmt (VarDef ident fs) e) = gets (\(st, r)->'Map'.get ident st)
+ >>= \mt->case mt of
+ Nothing = liftT $ Left $ UndeclaredVariableError zero ident
+ Just t = unify t fs >>= \t1 -> unify t1 e >>| pure a
checkStmt t r=:(FunStmt (FunCall f es)) = typeFun f es >>| pure r
checkStmt VoidType r=:(ReturnStmt Nothing) = pure r
checkStmt t r=:(ReturnStmt (Just e)) = unify t e >>| pure r
>>= \mt->case mt of
Nothing = liftT $ Left $ UndeclaredVariableError p ident
Just t = unify t fs
-
typeOp2 :: Expr Expr Op2 [Type] Type -> Env Type
typeOp2 e1 e2 op ts ret = typeExpr e1 >>= \t1-> typeExpr e2 >>= \t2->
- unify t1 t2 >>= \t3->if (isMember t3 ts) (pure ret)
+ unify t1 t2 >>= \t3->if (isMember t3 [IdType "":ts]) (pure ret)
(liftT $ Left $ OperatorError (extrPos e1) op t3)
buildFunctionType :: String [Expr] -> Env Type
// "Expression cannot be an polymorf type."
unify VarType e = typeExpr e
//we have to cheat to decorate the error, can be done nicer?
+ unify t=:(IdType id) e = typeExpr e >>= \tex->unify t tex
+ >>= \type->putIdent id type >>| pure type
unify t e = StateT $ \s0 -> let res = runStateT m s0 in case res of
Left err = Left $ decErr e err
Right t = Right t //note, t :: (Type, Gamma)
unify (ListType t1) (ListType t2) = unify t1 t2 >>| (pure $ ListType t1)
unify (ta1 ->> ta2) (tb1 ->> tb2) = unify ta1 tb1 >>= \ta-> unify ta2 tb2
>>= \tb-> pure (ta ->> tb)
+ unify VoidType VoidType = pure VoidType
unify t1 t2 = liftT $ Left $ UnifyError zero t1 t2
instance zero Pos where
restoreGamma :: Gamma -> Env Void
restoreGamma (oldstate, _) = gets snd >>= \newr->put (oldstate, newr)
+
+derive gEq Type
+instance == Type where
+ (==) (IdType _) (IdType _) = True
+ (==) o1 o2 = gEq{|*|} o1 o2