From 6b6d850bc47f3cb20cab0f24afcda31d57a12404 Mon Sep 17 00:00:00 2001
From: Jumper Chen <jumperchen@gmail.com>
Date: Wed, 20 Jul 2016 16:30:24 +0800
Subject: [PATCH] enhance yy info

---
 lib/jison.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/jison.js b/lib/jison.js
index d078056ee..07a269926 100755
--- a/lib/jison.js
+++ b/lib/jison.js
@@ -1594,6 +1594,11 @@ _handle_error:
                 // goto new state = table[STATE][NONTERMINAL]
                 newState = table[stack[stack.length-2]][stack[stack.length-1]];
                 stack.push(newState);
+
+                // enhance
+                sharedState.yy.stack = stack;
+                sharedState.yy.vstack = vstack;
+                sharedState.yy.lstack = lstack;
                 break;
 
             case 3: