from parse import :: ParserOutput, :: Error
:: Gamma :== 'Map'.Map String Type
-:: Env a :== (State Gamma (Either SemError a))
+:: Env a = Env (State Gamma (Either SemError a))
+
+instance Functor Env where
+ fmap f m = liftM f m
+
+instance Applicative Env where
+ (<*>) f g = ap f g
+ pure a = Env $ pure $ Right a
+
+instance Alternative Env where
+ empty = Env $ pure $ Left (Error "Undefined error")
+ (<|>) f g = f >>= \ef -> g >>= \eg -> Env $ pure $ (ef <|> eg) //case ef of
+ //Left e = eg
+ //Right r = Right r
+
+instance Monad Env where
+ bind e f = e >>= \ee -> Env $ pure $ case ee of
+ (Left e) = Left e
+ (Right r) = f r
get = state $ \s -> (s,s)
+instance toString SemError where
+ toString (ParseError p e) = concat [
+ toString p,"SemError: ParseError: ", e]
+ toString (Error e) = "SemError: " +++ e
+ toString (UnifyErrorStub t1 t2) = toString (UnifyError {line=0,col=0} t1 t2)
+ toString (UnifyError p t1 t2) = concat [
+ toString p,
+ "SemError: Cannot unify types. Expected: ",
+ toString t1, ". Given: ", toString t2]
+
+sem :: AST -> SemOutput
+sem x = undef
+/*
putIdent :: String Type -> Env Void
putIdent i t = gets ('Map'.get i) >>= \mt -> case mt of
Nothing = pure <$> modify ('Map'.put i t)
Left e = pure $ Left e
Right t3 = pure <$> modify ('Map'.put i t3)
-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]
-
sem :: AST -> SemOutput
sem (AST vd fd)
# (eithervds, gamma) = runState (mapM semVarDecl vd) 'Map'.newMap
semFunDecl f = pure $ Right f
semVarDecl :: VarDecl -> Env VarDecl
-semVarDecl v = pure $ Right v
-//Right v
-//semVarDecl vd=:(VarDecl pos type ident expr) = case unify type expr of // Left e = Left e
-// //TODO ident in de environment
-// Right e = Right $ pure vd
-
-typeOp1 :: Pos Expr Type -> Env Type
-typeOp1 p expr rtype = typeExpr expr >>= \exprtype->case exprtype of
- Left e = pure $ Left e
- Right rtype = pure $ Right rtype
- Right (IdType ident) = putIdent ident rtype >>| pure (Right rtype)
- Right t = pure $ Left $ UnifyError p rtype t
+semVarDecl vd=:(VarDecl pos type ident ex) = unify type ex
+ >>= \et->case et of
+ Left err = pure $ Left err
+ Right t = putIdent ident t >>| pure (Right $ VarDecl pos t ident ex)
typeExpr :: Expr -> Env Type
typeExpr (IntExpr _ _) = pure $ Right IntType
typeExpr (CharExpr _ _) = pure $ Right CharType
typeExpr (BoolExpr _ _) = pure $ Right BoolType
-typeExpr (Op1Expr p UnNegation expr) = typeOp1 p expr BoolType
-typeExpr (Op1Expr p UnMinus expr) = typeOp1 p expr IntType
+typeExpr (Op1Expr p UnNegation expr) = unify BoolType expr
+typeExpr (Op1Expr p UnMinus expr) = unify IntType expr
typeExpr (TupleExpr p (e1, e2)) = typeExpr e1
>>= \ete1->typeExpr e2 >>= \ete2->pure (
ete1 >>= \te1->ete2 >>= \te2->Right $ TupleType (te1, te2))
-//typeExpr (Op1Expr p UnMinus expr) = typeExpr expr
-// >>= \exprtype->case exprtype of
-// IntType = pure $ Right IntType
-// t = Left $ UnifyError p IntType exprtype
-//typeExpr (Op2Expr Pos Expr Op2 Expr) = undef
+//Int
+typeExpr (Op2Expr p e1 BiPlus e2) = unify IntType e1 >>| unify IntType e2
+typeExpr (Op2Expr p e1 BiMinus e2) = unify IntType e1 >>| unify IntType e2
+typeExpr (Op2Expr p e1 BiTimes e2) = unify IntType e1 >>| unify IntType e2
+typeExpr (Op2Expr p e1 BiDivide e2) = unify IntType e1 >>| unify IntType e2
+typeExpr (Op2Expr p e1 BiMod e2) = unify IntType e1 >>| unify IntType e2
+//bool, char of int
+typeExpr (Op2Expr p e1 BiEquals e2) = undef
+typeExpr (Op2Expr p e1 BiUnEqual e2) = undef
+//char of int
+typeExpr (Op2Expr p e1 BiLesser e2) = undef
+typeExpr (Op2Expr p e1 BiGreater e2) = undef
+typeExpr (Op2Expr p e1 BiLesserEq e2) = undef
+typeExpr (Op2Expr p e1 BiGreaterEq e2) = undef
+//bool
+typeExpr (Op2Expr p e1 BiAnd e2) = undef
+typeExpr (Op2Expr p e1 BiOr e2) = undef
+//a
+typeExpr (Op2Expr p e1 BiCons e2) = undef
//typeExpr (FunExpr Pos FunCall) = undef
//typeExpr (EmptyListExpr Pos) = undef
-//typeExpr (VarExpr Pos VarDef) = undef
+//typeExpr (VarExpr Pos VarDef) = undef //when checking var-expr, be sure to put the infered type
+ //in the context
class unify a :: Type a -> Env Type
+instance unify Expr where
+ unify (_ ->> _) e = pure $ Left $ ParseError (extrPos e)
+ "Expression cannot be a higher order function. Yet..."
+ unify VoidType e = pure $ Left $ ParseError (extrPos e)
+ "Expression cannot be a Void type."
+ unify (IdType _) e = pure $ Left $ ParseError (extrPos e)
+ "Expression cannot be an polymorf type."
+ unify VarType e = typeExpr e
+ unify t e = typeExpr e
+ >>= \eithertype->case eithertype of
+ Left e = pure $ Left e
+ Right tex = unify t tex >>= \eitherun->case eitherun of
+ Left err = pure $ Left $ decErr e err
+ Right t = pure $ Right t
+
instance unify Type where
unify IntType IntType = pure $ Right IntType
unify BoolType BoolType = pure $ Right BoolType
unify CharType CharType = pure $ Right CharType
- unify _ _ = undef
-//
-//instance unify Expr where
-// unify type expr = case type of
-// _ ->> _ = Left $ ParseError (extrPos expr)
-// "Expression cannot be a higher order function. Yet..."
-// VoidType = Left $ ParseError (extrPos expr)
-// "Expression cannot be a Void type."
-// IdType _ = Left $ ParseError (extrPos expr)
-// "Expression cannot be an polymorf type."
-// TupleType (_, _) = undef
-// ListType _ = undef
-// IntType = undef
-// BoolType = undef
-// CharType = undef
-// VarType = undef
+ unify t1 t2 = pure $ Left $ UnifyError zero t1 t2
+
+instance zero Pos where
+ zero = {line=0,col=0}
+
+decErr :: Expr SemError -> SemError
+decErr e (UnifyError _ t1 t2) = UnifyError (extrPos e) t1 t2
+decErr e (ParseError _ s) = ParseError (extrPos e) s
+decErr e err = err
+
+extrPos :: Expr -> Pos
+extrPos (VarExpr p _) = p
+extrPos (Op2Expr p _ _ _) = p
+extrPos (Op1Expr p _ _) = p
+extrPos (IntExpr p _) = p
+extrPos (CharExpr p _) = p
+extrPos (BoolExpr p _) = p
+extrPos (FunExpr p _) = p
+extrPos (EmptyListExpr p) = p
+extrPos (TupleExpr p _) = p
+*/
\ No newline at end of file
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