Merge branch 'master' of github.com:dopefishh/cc1516

[cc1516.git] / sem.icl

diff --git a/sem.icl b/sem.icl
index cd415c5..c7a41e9 100644 (file)
--- a/sem.icl
+++ b/sem.icl
@@ -60,6 +60,10 @@ instance toString SemError where
         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."]
 
@@ -74,12 +78,19 @@ where
         pure (vds, fds)
 
 semFunDecl :: FunDecl -> Env FunDecl
-semFunDecl f = pure f
+semFunDecl fd=:(FunDecl p f _ mt vds stmts) = case mt of 
+    Nothing = let t = IdType f in putIdent f t >>| pure fd
+    Just t = putIdent f t >>| pure fd
 
 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)
+
 typeExpr :: Expr -> Env Type
 typeExpr (IntExpr _ _) = pure IntType
 typeExpr (CharExpr _ _) = pure CharType
@@ -88,39 +99,27 @@ 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)
-//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 e1 >>= \t1 -> unify t1 e2 
-    >>| pure BoolType //todo, actually check t1 in Char,Bool,Int
-typeExpr (Op2Expr p e1 BiUnEqual e2) = typeExpr (Op2Expr p e1 BiEquals e2)
-//char of int
-typeExpr (Op2Expr p e1 BiLesser e2) = typeExpr e1 >>= \t1 -> unify t1 e2 
-    >>| pure BoolType //todo, actually check t1 in Char, Int
-typeExpr (Op2Expr p e1 BiGreater e2) = typeExpr (Op2Expr p e1 BiLesser e2)
-typeExpr (Op2Expr p e1 BiLesserEq e2) = typeExpr (Op2Expr p e1 BiLesser e2)
-typeExpr (Op2Expr p e1 BiGreaterEq e2) = typeExpr (Op2Expr p e1 BiLesser e2)
-//bool
-typeExpr (Op2Expr p e1 BiAnd e2) = unify BoolType e1 >>| unify BoolType e2
-typeExpr (Op2Expr p e1 BiOr e2) = unify BoolType e1 >>| unify BoolType e2
-//a
-typeExpr (Op2Expr p e1 BiCons e2) = typeExpr e1 >>= \t1-> typeExpr e2 
-    >>= \t2-> unify (ListType t1) t2
+typeExpr (Op2Expr p e1 op e2)
+| isMember op [BiPlus, BiMinus, BiTimes, BiDivide, BiMod] =
+       typeOp2 e1 e2 op [IntType]
+| isMember op [BiEquals, BiUnEqual] =
+       typeOp2 e1 e2 op [IntType, BoolType, CharType]
+| isMember op [BiLesser, BiGreater, BiLesserEq, BiGreaterEq] =
+       typeOp2 e1 e2 op [IntType, CharType]
+| isMember op [BiAnd, BiOr] =
+       typeOp2 e1 e2 op [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
+//ignore field selectors
 typeExpr (FunExpr p (FunCall f es)) = gets (\(st, r)->'Map'.get f st)
     >>= \mt-> case mt of
-        Nothing = undef
+        Nothing = let t = IdType f in putIdent f t >>| pure t
         Just t = unifyApp t es
-//ignore field selectors
 typeExpr (VarExpr p (VarDef ident fs)) = gets (\(st, r)->'Map'.get ident st)
     >>= \mt->case mt of
         Nothing = liftT $ Left $ UndeclaredVariableError p ident
-            //let t = IdType ident in putIdent ident t >>| pure t
         Just t = unify t fs
 
 unifyApp :: Type [Expr] -> Env Type