interpreter compiles

[proglang.git] / Typecheck.hs

diff --git a/Typecheck.hs b/Typecheck.hs
index 18146506a227857ce792198ba9e8575491c7f553..a701b6e85bf92a0e9f0807251e5eecbfa83c7592 100644 (file)
--- a/Typecheck.hs
+++ b/Typecheck.hs
@@ -1,4 +1,4 @@
-module Typecheck (typeCheckExp, typeCheckStm, typeCheckVar, typeCheckFunction, addFunction, State(..)) where 
+module Typecheck (typeCheckExp, typeCheckStm, typeCheckVar, typeCheckFunction, addFunction, emptyState, State(..)) where 
 
 
 import Abssyntax
@@ -11,6 +11,7 @@ type Function = (Type, [Type])
 
 data State = State {variables::Types,functions::(Map Ident Function),function::Ident}
 
+emptyState = State{variables=[empty], functions=(empty), function=(Ident "")}
 
 inList :: Eq a => a -> [a] -> Bool
 inList _ [] = False
@@ -50,6 +51,20 @@ typeCheckExp (ENeg e) = do
 typeCheckExp (ENot e) = do
        TBool <- typeCheckExp e
        return TBool
+typeCheckExp (EFunc i as) = do
+       state <- get
+       (t,ts) <- lookup i $ functions state
+       checkParams as ts
+       return t
+
+checkParams :: (MonadState State m) => [Exp] -> [Type] -> m ()
+checkParams [] [] = return ()
+checkParams [] _ = fail "Too for arguments when calling function" 
+checkParams _ [] = fail "Too many arguments when calling function" 
+checkParams (e:es) (t:ts) = do
+       t2 <- typeCheckExp e
+       assert (t == t2) "Arugments does not match"
+       checkParams es ts
 
 typeCheckVar :: (MonadState State m) => Ident -> m Type 
 typeCheckVar i = do