revent

[cc1516.git] / sem.icl

diff --git a/sem.icl b/sem.icl
index 9be1948..31221ca 100644 (file)
--- a/sem.icl
+++ b/sem.icl
@@ -35,7 +35,8 @@ 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 (UnifyErrorStub t1 t2) = toString (UnifyError {line=0,col=0} t1
+t2)
        toString (UnifyError p t1 t2) = concat [
                toString p,
                "SemError: Cannot unify types. Expected: ",
@@ -75,13 +76,13 @@ typeExpr (TupleExpr p (e1, e2)) = typeExpr e1
        >>= \ete1->typeExpr e2 >>= \ete2->pure (
                ete1 >>= \te1->ete2 >>= \te2->Right $ TupleType (te1, te2))
 //Int
-typeExpr (Op2Expr p e1 BiPlus e2) = undef
-typeExpr (Op2Expr p e1 BiMinus e2) = undef
-typeExpr (Op2Expr p e1 BiTimes e2) = undef
-typeExpr (Op2Expr p e1 BiDivide e2) = undef
-typeExpr (Op2Expr p e1 BiMod e2) = undef
+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 BiEquals e2) = 
 typeExpr (Op2Expr p e1 BiUnEqual e2) = undef
 //char of int
 typeExpr (Op2Expr p e1 BiLesser e2) = undef
@@ -95,7 +96,9 @@ typeExpr (Op2Expr p e1 BiOr e2) = undef
 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
 
@@ -106,6 +109,7 @@ instance unify Expr where
                        "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