From 9726c329b6d9ab02a1b50566ae96c82f29c5ec4d Mon Sep 17 00:00:00 2001
From: Michael Andreen <harv@ruin.nu>
Date: Fri, 24 Feb 2006 10:55:18 +0000
Subject: [PATCH] typechecker compiles but can't be run

---
 Typecheck.hs | 67 ++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 54 insertions(+), 13 deletions(-)

diff --git a/Typecheck.hs b/Typecheck.hs
index cc416e2..ec2270e 100644
--- a/Typecheck.hs
+++ b/Typecheck.hs
@@ -1,29 +1,70 @@
 module Typecheck where 
 
 import Abssyntax
+import Control.Monad.State
+import Data.Map as Map
+import Prelude hiding (lookup)
 
-typeCheckExp :: Exp -> Maybe Type
-BExp e o e' = do
-	TInt <- typeCheck e
-	TInt <- typeCheck e'
+
+type Types = Map Ident Type
+
+typeCheckExp :: (MonadState Types m) => Exp -> m Type
+typeCheckExp (BExp e o e') = do
+	TInt <- typeCheckExp e
+	TInt <- typeCheckExp e'
 	return TBool
-OpExp e o e' = do
-	TInt <- typeCheck e
-	TInt <- typeCheck e'
+typeCheckExp (OpExp e o e') = do
+	TInt <- typeCheckExp e
+	TInt <- typeCheckExp e'
 	return TInt
+typeCheckExp (EVar i) = typeCheckVar i
+typeCheckExp (EAss i e) = do
+	a <- typeCheckVar i
+	b <- typeCheckExp e
+	if a == b then return a else fail "FEL!"
+typeCheckExp (EInt i) = return TInt
+typeCheckExp (EBool b) = return TBool
+typeCheckExp EReadI = return TInt
+typeCheckExp EReadB = return TBool
+typeCheckExp (ExpT t e) = do
+	t2 <- typeCheckExp e
+	if t == t2 then return t else fail "FEL!"
+typeCheckExp EDefault = return NoType
+typeCheckExp (EPost i op) = do
+	TInt <- typeCheckVar i
+	return TInt
+
 
-typeCheckStm :: Stm -> Maybe Type
-SNoop = return NoType
-SExp e = typeCheckExp e
-SBlock ss = do 
+typeCheckVar :: (MonadState Types m) => Ident -> m Type 
+typeCheckVar i = do
+	e <- get
+	lookup i e
+
+typeCheckStm :: (MonadState Types m) => Stm -> m Type 
+typeCheckStm SNoop = return NoType
+typeCheckStm (SExp e) = do 
+	typeCheckExp e
+	return NoType
+typeCheckStm (SBlock ss) = do 
 	mapM typeCheckStm ss
 	return NoType
-SIf e s s' = do
+typeCheckStm (SIf e s s') = do
 	TBool <- typeCheckExp e
 	NoType <- typeCheckStm s
 	NoType <- typeCheckStm s
 	return NoType
-SWhile e s = do
+typeCheckStm (SWhile e s) = do
 	TBool <- typeCheckExp e
 	NoType <- typeCheckStm s
+	return NoType
+typeCheckStm (SDecl t i e) = do
+	t2 <- typeCheckExp e
+	if t == t2 then do
+		m <- get
+		put (insert i t m)
+		return NoType
+		else fail "Så får du inte göra!!!"
+typeCheckStm (SPrint e) = do
+	typeCheckExp e
+	return NoType
 
-- 
2.39.2