Call's LHS takes an AST; parse record access with op/

ast.hs

@@ -18,7 +18,8 @@ data AST = Add AST AST
 		 | Def Pattern AST
 		 | Var String
 		 | Lambda [(Pattern, AST)]
-		 | Call String AST
+		 | Call AST AST
+		 | Access AST AST
 		 | UnitConst
 		 | Cons AST AST
 		 | IfExpr AST AST AST

interp.hs

@@ -272,17 +272,19 @@ eval (NotEquals l r) = do { l <- eval l; r <- eval r; return $ l !=$ r }
 eval (LessThan l r) = do { l <- eval l; r <- eval r; return $ l <$ r }
 eval (GreaterThan l r) = do { l <- eval l; r <- eval r; return $ l >$ r }
 
-eval (Call name arg) = get >>= \(h,env) ->
-	case lookup env name of
-	  Just fn@(FnV cls _) -> do
+eval (Call lhs arg) = do
+	(h,env) <- get
+	v <- eval lhs
+	case v of
+	  fn@(FnV cls _) -> do
 	  	arg' <- eval arg
 	  	let cls' = if cls == [] then [last env] else cls -- if [], use current global env
 	  	put (h,cls') -- enter closure env
 	  	v <- apply fn arg'
 	  	put (h,env) -- restore env
 	  	return v
-	  Just fn@(Builtin _) -> eval arg >>= apply fn
-	  Nothing -> error $ "call: name " ++ name ++ " doesn't exist or is not a function"
+	  fn@(Builtin _) -> eval arg >>= apply fn
+	  _ -> error $ "call: " ++ show v ++ " is not a function"
 
 eval x = error $ "eval: unhandled: " ++ show x
 

parser.hs

@@ -128,20 +128,20 @@ lambda = do
 	body <- exprparser
 	return $ Lambda [(pat, body)]
 
-call = do
-	name <- identifier
+call p argp = do
+	lhs <- p
 	whiteSpace
 	symbol "("
-	args <- sepBy exprparser (symbol ",")
+	args <- sepBy argp (symbol ",")
 	let arg = (case args of
 		[] -> UnitConst
 		[a] -> a
 		otherwise -> TupleConst args)
 	symbol ")"
-	return $ Call name arg
+	return $ Call lhs arg
 
 consExpr = do
-	x <- expr'
+	x <- expr3
 	symbol "::"
 	y <- exprparser
 	return $ Cons x y
@@ -164,14 +164,18 @@ def = do
 	value <- exprparser
 	return $ Def pat value
 
-expr' = try block
-	 <|> try funDef
-	 <|> try call
+-- field access
+accessOp = do
+	symbol "/"
+	return Access
+
+expr1 = try block
 	 <|> try lambda
+--	 <|> try funDef
 	 <|> try def
-	 <|> try (emptyTuple TupleConst)
-	 <|> try (tupleSeq exprparser TupleConst)
-	 <|> parens exprparser
+	 -- <|> try (emptyTuple TupleConst)
+	 -- <|> try (tupleSeq exprparser TupleConst)
+	 -- <|> parens exprparser
 	 <|> listSeq exprparser ListConst
 	 <|> try ifExpr
 	 <|> try bool
@@ -179,8 +183,15 @@ expr' = try block
 	 <|> fmap StrConst stringLiteral
 	 <|> fmap IntConst integer
 
+expr2 = try $ chainl1 expr1 accessOp
+	  <|> expr1
+
+expr3 = try funDef
+	   <|> try (call expr2 exprparser)
+	   <|> expr2
+
 term = try consExpr
-	<|> expr'
+	<|> expr3
 
 seqStmt = sepBy1 statement semi