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 (UnifyErrorStub t1 t2) = toString (UnifyError {line=0,col=0} t1
+t2)
toString (UnifyError p t1 t2) = concat [
toString p,
"SemError: Cannot unify types. Expected: ",
>>= \et->case et of
Left err = pure $ Left err
Right t = putIdent ident t >>| pure (Right $ VarDecl pos t ident ex)
-//Right v
-// //TODO ident in de environment
-// Right e = Right $ pure vd
typeExpr :: Expr -> Env Type
typeExpr (IntExpr _ _) = pure $ Right IntType
typeExpr (TupleExpr p (e1, e2)) = typeExpr e1
>>= \ete1->typeExpr e2 >>= \ete2->pure (
ete1 >>= \te1->ete2 >>= \te2->Right $ TupleType (te1, te2))
-//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) =
+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
"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