-sem (AST vd fd) = case runStateT m ('Map'.newMap, getRandomStream 1) of
- Left e = Left [e]
- 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)
-
-semFunDecl :: FunDecl -> Env FunDecl
-semFunDecl fd=:(FunDecl p f args mt vds stmts) =
- (case mt of
- Nothing = genType args >>= \infft->putIdent f infft >>| pure infft
- Just t = putIdent f t >>| pure t) >>= \ft ->
- saveGamma >>= \gamma ->
- matchFunctions args ft >>= \tres->
- mapM semVarDecl vds >>= \newvds->
- mapM (checkStmt tres) stmts >>= \newstmts->
- case mt of
- Nothing = inferReturnType stmts
- >>= \returntype->reconstructType args tres
- >>= \ftype->pure Void//restoreGamma gamma
- >>| putIdent f ftype >>| pure (
- 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)
- >>= \mtype->case mtype of
- Nothing = liftT $ Left $ Error "Not used ????"
- Just type = reconstructType xs t >>= \resttype->pure (type ->> resttype)
-
-genType :: [String] -> Env Type
-genType [] = freshIdent >>= \fi->pure $ IdType fi
-genType [x:xs] = liftM2 (->>) (freshIdent >>= \fi->pure $ IdType fi)
- (genType xs)
-
-matchFunctions :: [String] Type -> Env Type
-matchFunctions [] (_ ->> _) = liftT $ Left $ Error "Not enough arguments"
-matchFunctions _ (VoidType ->> _) = liftT $ Left $ Error "Cannot have a void type in the middle of the function definition"
-matchFunctions [x:xs] (t1 ->> t2) =
- modify (\(st, r)->('Map'.put x t1 st, r)) >>| matchFunctions xs t2
-matchFunctions [] t = pure t
-matchFunctions _ t = liftT $ Left $ Error "Too much argumnts"
-
-semVarDecl :: VarDecl -> Env VarDecl
-semVarDecl (VarDecl pos type ident ex) = unify type ex
- >>= \t-> putIdent ident t >>| (pure $ VarDecl pos t ident ex)
-
-checkStmt ::Type Stmt -> Env Stmt
-checkStmt t (IfStmt c st se) = unify BoolType c >>| mapM (checkStmt t) 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 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
-
-typeExpr :: Expr -> Env Type
-typeExpr (IntExpr _ _) = pure IntType
-typeExpr (CharExpr _ _) = pure CharType
-typeExpr (BoolExpr _ _) = pure BoolType
-typeExpr (Op1Expr p UnNegation expr) = unify BoolType expr
-typeExpr (Op1Expr p UnMinus expr) = unify IntType expr
-typeExpr (TupleExpr p (e1, e2)) = typeExpr e1
- >>= \t1-> typeExpr e2 >>= \t2-> pure $ TupleType (t1, t2)
-typeExpr (Op2Expr p e1 op e2)
-| isMember op [BiPlus, BiMinus, BiTimes, BiDivide, BiMod] =
- typeOp2 e1 e2 op [IntType] IntType
-| isMember op [BiEquals, BiUnEqual] =
- typeOp2 e1 e2 op [IntType, BoolType, CharType] BoolType
-| isMember op [BiLesser, BiGreater, BiLesserEq, BiGreaterEq] =
- typeOp2 e1 e2 op [IntType, CharType] BoolType
-| isMember op [BiAnd, BiOr] =
- typeOp2 e1 e2 op [BoolType] BoolType
-| op == BiCons = typeExpr e1 >>= \t1-> typeExpr e2
- >>= \t2-> unify (ListType t1) t2
-typeExpr (EmptyListExpr p) = freshIdent >>= \frsh-> let t = IdType frsh in
- putIdent frsh t >>| pure t
-typeExpr (FunExpr p (FunCall f es)) = typeFun f es
-typeExpr (VarExpr p (VarDef ident fs)) = gets (\(st, r)->'Map'.get ident st)
- >>= \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 [IdType "":ts]) (pure ret)
- (liftT $ Left $ OperatorError (extrPos e1) op t3)
-
-buildFunctionType :: String [Expr] -> Env Type
-buildFunctionType frsh [] = let t = IdType frsh in putIdent frsh t >>| pure t
-buildFunctionType frsh [e:es] = (->>) <$> typeExpr e <*> buildFunctionType frsh es