import qualified Data.Map as Map
from Data.Func import $
import Data.Maybe
+import Data.Void
import Data.Either
import Data.Functor
import Control.Applicative
import StdString
import StdTuple
import StdList
+import StdBool
+import GenEq
from Text import class Text(concat), instance Text String
import AST
-from parse import :: ParserOutput, :: Error
:: Gamma :== ('Map'.Map String Type, [String])
:: Env a :== StateT Gamma (Either SemError) a
instance MonadTrans (StateT Gamma) where
liftT m = StateT \s-> m >>= \a-> return (a, s)
-get = gets id
-
-getRandomStream :: Int -> [String]
-getRandomStream i = genIdents $ filter (isAlpha o toChar) (genRandInt i)
- where
- genIdents r = let (ic, r2) = splitAt 5 r in [toString ic: genIdents r2]
-
-freshIdent :: Env String
-freshIdent = get >>= \(st, [ident:rest])-> put (st, rest)
- >>| case 'Map'.get ident st of
- Nothing = pure ident
- _ = freshIdent
-
-putIdent :: String Type -> Env Void
-putIdent i t = gets (\(st, r)->'Map'.get i st) >>= \mt -> case mt of
- Nothing = modify (\(st, r)->('Map'.put i t st, r))
- Just t2 = unify t t2 >>= \t3-> modify (\(st, r)->('Map'.put i t3 st, r))
-
-instance toString SemError where
- toString (ParseError p e) = concat [
- toString p,"SemError: ParseError: ", e]
- toString (Error e) = "SemError: " +++ e
- toString (UnifyError p t1 t2) = concat [
- toString p,
- "SemError: Cannot unify types. Expected: ",
- toString t1, ". Given: ", toString t2]
- toString (FieldSelectorError p t fs) = concat [
- toString p,
- "SemError: Cannot select ", toString fs, " from type: ",
- toString t]
- toString (OperatorError p o t) = concat [
- toString p,
- "SemError: No ", toString o, " for type ",
- toString t]
+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 >>= \fds ->
- pure (vds, fds)
+ 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 f = pure f
+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->
+ inferReturnType stmts >>= \returntype->
+ case mt of
+ Nothing = reconstructType args tres
+ >>= \ftype->restoreGamma gamma
+ >>| putIdent f ftype >>| pure (
+ FunDecl p f args (Just ftype) newvds newstmts)
+ Just t = restoreGamma gamma >>| updateFunType t returntype
+ >>= \tt-> pure (FunDecl p f args (Just tt) newvds newstmts)
+
+updateFunType :: Type Type -> Env Type
+updateFunType t1 t2 = unify t1 t2
+updateFunType (t1 ->> t2) t3 = t1 ->> (updateFunType t2 t3)
+
+inferReturnType :: [Stmt] -> Env Type
+inferReturnType [] = pure VoidType
+inferReturnType [ReturnStmt (Just t):rest] = typeExpr t
+ >>= \tx->inferReturnType rest >>= \ty->unify tx ty
+inferReturnType [ReturnStmt _:rest] =
+ inferReturnType rest >>= \tx-> unify VoidType tx
+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 $
+ ArgumentMisMatchError zero "Not enough arguments"
+matchFunctions _ (VoidType ->> _) = liftT $ Left $
+ ArgumentMisMatchError zero "Void can't be a non return type"
+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 $
+ ArgumentMisMatchError zero "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)
-typeOp2 :: Expr Expr Op2 [Type] -> Env Type
-typeOp2 e1 e2 op ts = typeExpr e1 >>= \t1-> typeExpr e2 >>= \t2->
- unify t1 t2 >>= \t3->if (isMember t3 ts) (pure t3)
- (liftT $ Left $ OperatorError (extrPos e1) op t3)
+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
>>= \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]
+ typeOp2 e1 e2 op [IntType] IntType
| isMember op [BiEquals, BiUnEqual] =
- typeOp2 e1 e2 op [IntType, BoolType, CharType]
+ typeOp2 e1 e2 op [IntType, BoolType, CharType] BoolType
| isMember op [BiLesser, BiGreater, BiLesserEq, BiGreaterEq] =
- typeOp2 e1 e2 op [IntType, CharType]
+ typeOp2 e1 e2 op [IntType, CharType] BoolType
| isMember op [BiAnd, BiOr] =
- typeOp2 e1 e2 op [BoolType]
+ 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 fid args)) = undef
-//ignore field selectors
+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 = let t = IdType ident in putIdent ident t >>| pure t
- Just t = unify t fs
+ >>= \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
+
+unifyApp :: Type [Expr] -> Env Type
+unifyApp t [] = pure t
+unifyApp (tf1 ->> tf2) [t1:ts] = unify tf1 t1 >>| unifyApp tf2 ts
+unifyApp t1 t2 = liftT $ Left $ UnifyError zero t1 (IdType "[expressions, FIXME]")
+
+typeFun :: String [Expr] -> Env Type
+typeFun f es = gets (\(st, r)->'Map'.get f st) >>= \mt-> case mt of
+ Nothing = freshIdent >>= \frsh-> buildFunctionType frsh es
+ >>= \ft-> putIdent f ft >>| (pure $ IdType frsh)
+ Just t = unifyApp t es
+
+resultType :: Type -> Type
+resultType (_ ->> t) = resultType t
+resultType t = t
class unify a :: Type a -> Env Type
"Expression cannot be a higher order function. Yet..."
unify VoidType e = liftT $ Left $ ParseError (extrPos e)
"Expression cannot be a Void type."
- unify (IdType _) e = liftT $ Left $ ParseError (extrPos e)
- "Expression cannot be an polymorf type."
+// unify (IdType _) e = liftT $ Left $ ParseError (extrPos e)
+// "Expression cannot be an polymorf type."
unify VarType e = typeExpr e
- unify (IdType i) e = undef
//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)
where m = typeExpr e >>= \tex-> unify t tex
-replace :: String Type -> Env Void
-replace ident type = get >>= \(st, fr)->put ('Map'.fromList $
- map (itupdate ident type) ('Map'.toList st), fr)
- where
- itupdate :: String Type (String, Type) -> (String, Type)
- itupdate ident newtype ov=:(key, IdType type) = if (ident == type)
- (key, newtype) ov
- itupdate ident newtype (key, TupleType (t1, t2))
- # (_, t1) = itupdate ident newtype (key, t1)
- # (_, t2) = itupdate ident newtype (key, t2)
- = (key, TupleType (t1, t2))
- itupdate ident newtype (key, ListType t1)
- # (_, t1) = itupdate ident newtype (key, t1)
- = (key, ListType t1)
- itupdate _ _ k = k
-
instance unify Type where
unify IntType IntType = pure IntType
unify BoolType BoolType = pure BoolType
unify t (IdType i) = unify (IdType i) t
unify (IdType i) t = replace i t >>| pure t
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 t = pure t
+ unify t VoidType = pure t
+ unify VoidType VoidType = pure VoidType
unify t1 t2 = liftT $ Left $ UnifyError zero t1 t2
instance zero Pos where
toString (mp, _) = concat
[concat [k, ": ", toString v, "\n"]\\(k, v) <- 'Map'.toList mp]
+getRandomStream :: Int -> [String]
+getRandomStream i = genIdents $ filter (isAlpha o toChar) (genRandInt i)
+ where
+ genIdents r = let (ic, r2) = splitAt 5 r in [toString ic: genIdents r2]
+
+freshIdent :: Env String
+freshIdent = get >>= \(st, [ident:rest])-> put (st, rest)
+ >>| case 'Map'.get ident st of
+ Nothing = pure ident
+ _ = freshIdent
+
+putIdent :: String Type -> Env Void
+putIdent i t = gets (\(st, r)->'Map'.get i st) >>= \mt -> case mt of
+ Nothing = modify (\(st, r)->('Map'.put i t st, r))
+ Just t2 = unify t t2 >>= \t3-> modify (\(st, r)->('Map'.put i t3 st, r))
+
+replace :: String Type -> Env Void
+replace ident type = get >>= \(st, fr)->put ('Map'.fromList $
+ map (itupdate ident type) ('Map'.toList st), fr)
+ where
+ itupdate :: String Type (String, Type) -> (String, Type)
+ itupdate ident newtype ov=:(key, IdType type) = if (ident == type)
+ (key, newtype) ov
+ itupdate ident newtype (key, TupleType (t1, t2))
+ # (_, t1) = itupdate ident newtype (key, t1)
+ # (_, t2) = itupdate ident newtype (key, t2)
+ = (key, TupleType (t1, t2))
+ itupdate ident newtype (key, ListType t1)
+ # (_, t1) = itupdate ident newtype (key, t1)
+ = (key, ListType t1)
+ itupdate _ _ k = k
+
+instance toString SemError where
+ toString (ParseError p e) = concat [toString p,
+ "SemError: ParseError: ", e]
+ toString (UnifyError p t1 t2) = concat [ toString p,
+ "SemError: Cannot unify types. Expected: ",
+ toString t1, ". Given: ", toString t2]
+ toString (FieldSelectorError p t fs) = concat [ toString p,
+ "SemError: Cannot select ", toString fs, " from type: ",
+ toString t]
+ toString (OperatorError p o t) = concat [
+ toString p,
+ "SemError: No ", toString o, " for type ",
+ toString t]
+ toString (UndeclaredVariableError p ident) = concat [
+ toString p, "SemError: identifier: ", ident, " undefined."]
+ toString (ArgumentMisMatchError p s) = concat [toString p,
+ "SemError: Argument mismatch: ", s]
+ toString (Error e) = "SemError: " +++ e
+
+saveGamma :: Env Gamma
+saveGamma = get
+
+restoreGamma :: Gamma -> Env Void
+restoreGamma (oldstate, _) = gets snd >>= \newr->put (oldstate, newr)
-// class free a :: a -> Env [a]
+derive gEq Type
+instance == Type where
+ (==) (IdType _) (IdType _) = True
+ (==) o1 o2 = gEq{|*|} o1 o2
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