From 4f162814483aa0ab4e11cab51e23f807bece906c Mon Sep 17 00:00:00 2001
From: pimjager <pim@pimjager.nl>
Date: Thu, 7 Apr 2016 15:41:35 +0200
Subject: [PATCH] Sem

---
 ontwerpbesluiten.txt |  8 +++++-
 sem.dcl              |  1 +
 sem.icl              | 62 +++++++++++++++++++++++++++-----------------
 3 files changed, 46 insertions(+), 25 deletions(-)

diff --git a/ontwerpbesluiten.txt b/ontwerpbesluiten.txt
index 4c245aa..8cbcf17 100644
--- a/ontwerpbesluiten.txt
+++ b/ontwerpbesluiten.txt
@@ -4,4 +4,10 @@ Waarom?
 Mooiere puurdere lambda-calculus. Is chill straks met hogere orde functies (denken we)
 Staat mooie shizzle zoals in Haskell toe (f :: a -> a, g :: a -> a, f = g)
 Simpeler om te parsen
-Con: wellicht kut met code generatie, wie weet.
\ No newline at end of file
+Con: wellicht kut met code generatie, wie weet.
+
+--
+Functies en variabelen delen 1 namespace. 
+Dat is met het oog op hogere orde functies, dan kan een parameter voor een functie een andere 
+functie zijn, of een variabele en als die 2 aparte namespaces hebben is dat moeilijk onduidelijk / 
+praktisch onmogelijke met type inteference
\ No newline at end of file
diff --git a/sem.dcl b/sem.dcl
index 5c01ba0..6351c04 100644
--- a/sem.dcl
+++ b/sem.dcl
@@ -2,6 +2,7 @@ definition module sem
 
 from Data.Either import :: Either
 from AST import :: AST, :: Pos, :: Type
+from StdOverloaded import class toString
 
 :: SemError 
 	= ParseError Pos String 
diff --git a/sem.icl b/sem.icl
index 99aa44a..50b67ea 100644
--- a/sem.icl
+++ b/sem.icl
@@ -22,6 +22,15 @@ from parse import :: ParserOutput, :: Error
 :: Gamma :== 'Map'.Map String Type
 :: Env a :== (State Gamma (Either SemError a))
 
+get = state $ \s -> (s,s)
+
+putIdent :: String Type -> Env Void
+putIdent i t = gets ('Map'.get i) >>= \mt -> case mt of
+    Nothing = pure <$> modify ('Map'.put i t)
+    Just t2 = unify t t2 >>= \r -> case r of
+        Left e  = pure $ Left e
+        Right t3 = pure <$> modify ('Map'.put i t3)
+
 instance toString SemError where
 	toString (ParseError p e) = concat [
 		toString p,"SemError: ParseError: ", e]
@@ -57,31 +66,36 @@ semVarDecl v = pure $ Right v
 //	//TODO ident in de environment
 //	Right e = Right $ pure vd
 //
-//typeExpr :: Expr -> Env Type
-//typeExpr (IntExpr _ _) = Right $ pure IntType
-//typeExpr (CharExpr _ _) = Right $ pure CharType
-//typeExpr (BoolExpr _ _) = Right $ pure BoolType
-//typeExpr (Op1Expr p UnNegation expr) = undef//typeExpr expr 
-////	>>= \exprtype->case exprtype of
-////		Right BoolType = Right $ pure BoolType
-////		t = Left $ UnifyError p BoolType exprtype
-//typeExpr (Op1Expr p UnMinus expr) = undef// typeExpr expr 
-////	>>= \exprtype->case exprtype of
-////		IntType = Right $ pure IntType
-////		t = Left $ UnifyError p IntType exprtype
-//// typeExpr (Op2Expr Pos Expr Op2 Expr) = undef
-////typeExpr (FunExpr Pos FunCall
-////typeExpr (EmptyListExpr Pos 
-////typeExpr (TupleExpr Pos (Expr, Expr)
-////typeExpr (VarExpr Pos VarDef) = undef
+typeExpr :: Expr -> Env Type
+typeExpr (IntExpr _ _) = pure $ Right IntType
+typeExpr (CharExpr _ _) = pure $ Right CharType
+typeExpr (BoolExpr _ _) = pure $ Right BoolType
+typeExpr (Op1Expr p UnNegation expr) = typeExpr expr 
+	>>= \exprtype->case exprtype of
+        Left e = pure $ Left e
+		Right BoolType = pure $ Right BoolType
+        Right (IdType ident) = putIdent ident BoolType >>| pure (Right BoolType)
+		Right t = pure $ Left $ UnifyError p BoolType t
+//typeExpr (Op1Expr p UnMinus expr) = typeExpr expr 
+//	>>= \exprtype->case exprtype of
+//		IntType = pure $ Right IntType
+//		t = Left $ UnifyError p IntType exprtype
+//typeExpr (Op2Expr Pos Expr Op2 Expr) = undef
+//typeExpr (FunExpr Pos FunCall) = undef
+//typeExpr (EmptyListExpr Pos) = undef
+//typeExpr (TupleExpr Pos (Expr, Expr)) = undef
+//typeExpr (VarExpr Pos VarDef) = undef
+
+
+
 ////
-//class unify a :: Type a -> Env a
-//
-//instance unify Type where
-//	unify IntType IntType = Right $ pure IntType
-//	unify BoolType BoolType = Right $ pure BoolType
-//	unify CharType CharType = Right $ pure CharType
-//	unify _ _ = undef
+class unify a :: Type a -> Env Type
+
+instance unify Type where
+	unify IntType IntType = pure $ Right IntType
+	unify BoolType BoolType = pure $ Right BoolType
+	unify CharType CharType = pure $ Right CharType
+	unify _ _ = undef
 //
 //instance unify Expr where
 //	unify type expr = case type of
-- 
2.20.1