CheckIf statements

diff --git a/examples/varEx.spl b/examples/varEx.spl
index fa77063..95c9a13 100644 (file)
--- a/examples/varEx.spl
+++ b/examples/varEx.spl
@@ -29,5 +29,10 @@ var pim = 'a' == 'b';
 var q = facR(3);
 
 facR(n) :: Int -> Int {
+    if (True) {
+        return 3;
+    } else {
+        return 4;
+    }
     return 5;
 }

diff --git a/sem.icl b/sem.icl
index 2dc487f..0146c3a 100644 (file)
--- a/sem.icl
+++ b/sem.icl
@@ -16,6 +16,7 @@ from StdFunc import id, const, o
 import StdString
 import StdTuple
 import StdList
+import StdBool
 
 from Text import class Text(concat), instance Text String
 
@@ -48,6 +49,22 @@ putIdent i t = gets (\(st, r)->'Map'.get i st) >>= \mt -> case mt of
     Nothing = modify (\(st, r)->('Map'.put i t st, r))
     Just t2 = unify t t2 >>= \t3-> modify (\(st, r)->('Map'.put i t3 st, r))
 
+replace :: String Type -> Env Void
+replace ident type = get >>= \(st, fr)->put ('Map'.fromList $ 
+        map (itupdate ident type) ('Map'.toList st), fr)
+    where
+        itupdate :: String Type (String, Type) -> (String, Type)
+        itupdate ident newtype ov=:(key, IdType type) = if (ident == type)
+            (key, newtype) ov
+        itupdate ident newtype (key, TupleType (t1, t2))
+        # (_, t1) = itupdate ident newtype (key, t1)
+        # (_, t2) = itupdate ident newtype (key, t2)
+        = (key, TupleType (t1, t2))
+        itupdate ident newtype (key, ListType t1)
+        # (_, t1) = itupdate ident newtype (key, t1)
+        = (key, ListType t1)
+        itupdate _ _ k = k
+
 instance toString SemError where
        toString (ParseError p e) = concat [
                toString p,"SemError: ParseError: ", e]
@@ -78,7 +95,9 @@ where
         pure (vds, fds)
 
 semFunDecl :: FunDecl -> Env FunDecl
-semFunDecl fd=:(FunDecl p f _ mt vds stmts) = case mt of 
+semFunDecl fd=:(FunDecl p f _ mt vds stmts) = mapM_ semVarDecl vds >>| 
+    mapM_ (checkStmt IntType) stmts >>| 
+    case mt of 
     Nothing = let t = IdType f in putIdent f t >>| pure fd
     Just t = putIdent f t >>| pure fd
 
@@ -86,10 +105,21 @@ 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] Type -> Env Type
-typeOp2 e1 e2 op ts ret = typeExpr e1 >>= \t1-> typeExpr e2 >>= \t2->
-       unify t1 t2     >>= \t3->if (isMember t3 ts) (pure ret)
-               (liftT $ Left $ OperatorError (extrPos e1) op t3)
+checkStmt ::Type Stmt -> Env Stmt
+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 (WhileStmt c [et]) = undef
+checkStmt t (AssStmt (VarDef ident fs) e) = undef
+checkStmt t (FunStmt (FunCall f es)) = undef
+checkStmt VoidType r=:(ReturnStmt Nothing) = pure r
+checkStmt t r=:(ReturnStmt (Just e)) = typeExpr e >>= \te -> unify t te 
+    >>| pure r
+
+all :: [Bool] -> Bool
+all as = foldr (&&) True as
+
+last :: [a] -> a
+last as = foldl (\_ r -> r) (hd as) as
 
 typeExpr :: Expr -> Env Type
 typeExpr (IntExpr _ _) = pure IntType
@@ -122,6 +152,11 @@ typeExpr (VarExpr p (VarDef ident fs)) = gets (\(st, r)->'Map'.get ident st)
         Nothing = liftT $ Left $ UndeclaredVariableError p ident
         Just t = unify t fs
 
+typeOp2 :: Expr Expr Op2 [Type] Type -> Env Type
+typeOp2 e1 e2 op ts ret = typeExpr e1 >>= \t1-> typeExpr e2 >>= \t2->
+    unify t1 t2 >>= \t3->if (isMember t3 ts) (pure ret)
+        (liftT $ Left $ OperatorError (extrPos e1) op t3)
+
 buildFunctionType :: String [Expr] -> Env Type 
 buildFunctionType frsh [] = let t = IdType frsh in putIdent frsh t >>| pure t
 buildFunctionType frsh [e:es] = (->>) <$> typeExpr e <*> buildFunctionType frsh es
@@ -156,22 +191,6 @@ instance unify Expr where
         Right t = Right t //note, t :: (Type, Gamma) 
     where m = typeExpr e >>= \tex-> unify t tex 
 
-replace :: String Type -> Env Void
-replace ident type = get >>= \(st, fr)->put ('Map'.fromList $ 
-               map (itupdate ident type) ('Map'.toList st), fr)
-       where
-               itupdate :: String Type (String, Type) -> (String, Type)
-               itupdate ident newtype ov=:(key, IdType type) = if (ident == type)
-                       (key, newtype) ov
-               itupdate ident newtype (key, TupleType (t1, t2))
-               # (_, t1) = itupdate ident newtype (key, t1)
-               # (_, t2) = itupdate ident newtype (key, t2)
-               = (key, TupleType (t1, t2))
-               itupdate ident newtype (key, ListType t1)
-               # (_, t1) = itupdate ident newtype (key, t1)
-               = (key, ListType t1)
-               itupdate _ _ k = k
-
 instance unify Type where
        unify IntType IntType = pure IntType
        unify BoolType BoolType = pure BoolType