From c61f7ad5fba9d1c8a62008b8bd3fd87f1310bf4e Mon Sep 17 00:00:00 2001
From: Christian Neukirchen <chneukirchen@gmail.com>
Date: Thu, 22 Oct 2015 22:09:54 +0200
Subject: add negation

---
 lr.c | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'lr.c')

diff --git a/lr.c b/lr.c
index b7c8d1b..8db5916 100644
--- a/lr.c
+++ b/lr.c
@@ -164,6 +164,8 @@ parse_op()
 	return 0;
 }
 
+struct expr *parse_cmp();
+
 struct expr *
 parse_inner()
 {
@@ -171,6 +173,12 @@ parse_inner()
 		struct expr *e = malloc (sizeof (struct expr));
 		e->op = EXPR_PRUNE;
 		return e;
+	} else if (token("!")) {
+		struct expr *e = parse_cmp();
+		struct expr *not = malloc (sizeof (struct expr));
+		not->op = EXPR_NOT;
+		not->a.expr = e;
+		return not;
 	} else
 		return 0;
 	// TODO negation
-- 
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