Added function type inference

diff --git a/examples/StmtEx.spl b/examples/StmtEx.spl
index 1e1d4fe..35ff096 100644 (file)
--- a/examples/StmtEx.spl
+++ b/examples/StmtEx.spl
@@ -3,6 +3,7 @@ var y = 3;
 var z = 3 + y;
 Int a = facR(4);
 //Int b = test(3);
+var f = beep();
 
 facR(n) :: Int -> Int {
     test(3);
@@ -20,4 +21,12 @@ test(n) :: Int -> Int {
     while (z < 3) {
         return 3;
     }
+}
+
+beep() {
+    boop();
+}
+
+boop() {
+    beep();
 }
\ No newline at end of file

diff --git a/sem.icl b/sem.icl
index ffe95dd..3f4458a 100644 (file)
--- a/sem.icl
+++ b/sem.icl
@@ -95,7 +95,10 @@ where
         pure (vds, fds)
 
 semFunDecl :: FunDecl -> Env FunDecl
-semFunDecl fd=:(FunDecl p f _ mt vds stmts) = mapM_ semVarDecl vds >>| 
+semFunDecl fd=:(FunDecl p f args mt vds stmts) = (case mt of
+    Nothing = typeFun f args
+    Just t = putIdent f t) >>|
+    mapM_ semVarDecl vds >>| 
     mapM_ (checkStmt IntType) stmts >>| 
     case mt of 
     Nothing = let t = IdType f in putIdent f t >>| pure fd
@@ -110,8 +113,8 @@ 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 (AssStmt (VarDef ident fs) e) = undef
-checkStmt t r=:(FunStmt funcall) = typeFun funcall >>| pure r
+checkStmt t (AssStmt (VarDef ident fs) e) = 
+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
 
@@ -139,7 +142,7 @@ typeExpr (Op2Expr p e1 op 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) = typeFun funcall
+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 = liftT $ Left $ UndeclaredVariableError p ident
@@ -198,12 +201,14 @@ instance unify Type where
 instance zero Pos where
        zero = {line=0,col=0}
 
-typeFun :: FunCall -> Env Type
-typeFun (FunCall f es) = gets (\(st, r)->'Map'.get f st) >>= \mt-> case mt of
+typeFun :: String [String] -> 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
 
+
+
 decErr :: Expr SemError -> SemError
 decErr e (UnifyError _ t1 t2) = UnifyError (extrPos e) t1 t2
 decErr e (FieldSelectorError _ t fs) = FieldSelectorError (extrPos e) t fs
@@ -229,5 +234,3 @@ instance toString Gamma where
        toString (mp, _) = concat
                [concat [k, ": ", toString v, "\n"]\\(k, v) <- 'Map'.toList mp]
 
-
-// class free a :: a -> Env [a]