-module Typecheck (typeCheckExp, typeCheckStm, typeCheckVar, typeCheckFunction, addFunction, State(..)) where
+module Typecheck (typeCheckExp, typeCheckStm, typeCheckVar, typeCheckFunction, addFunction, emptyState, State(..)) where
import Abssyntax
data State = State {variables::Types,functions::(Map Ident Function),function::Ident}
-
-inList :: Eq a => a -> [a] -> Bool
-inList _ [] = False
-inList a (x:xs) = if a == x then True else inList a xs
+emptyState = State{variables=[empty], functions=(empty), function=(Ident "")}
assert :: Monad m => Bool -> String -> m ()
assert True _ = return ()
t1 <- typeCheckExp e
t2 <- typeCheckExp e'
assert (t1 == t2) "The parameters for the binary operator aren't equal"
- if inList o [Eq,NEq] then return TBool
+ if elem o [Eq,NEq] then return TBool
else do
assert (t1 == TInt) "The parameters need to be of type int"
- if inList o [Plus,Minus,Times,Div]
+ if elem o [Plus,Minus,Times,Div]
then return TInt
else return TBool
typeCheckExp (EVar i) = typeCheckVar i
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