From 96d3de1858ff91c9726e81c344cd5a4ea2cce4b7 Mon Sep 17 00:00:00 2001
From: Richard Gibson <richard.gibson@gmail.com>
Date: Wed, 3 Oct 2012 16:03:29 -0400
Subject: [PATCH] Fix jQuery #12643: don't tokenize trailing commas

---
 sizzle.js             | 3 ++-
 test/unit/selector.js | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/sizzle.js b/sizzle.js
index 0f4df28f..f7a23bfc 100644
--- a/sizzle.js
+++ b/sizzle.js
@@ -1029,7 +1029,8 @@ function tokenize( selector, parseOnly ) {
 		// Comma and first run
 		if ( !matched || (match = rcomma.exec( soFar )) ) {
 			if ( match ) {
-				soFar = soFar.slice( match[0].length );
+				// Don't consume trailing commas as valid
+				soFar = soFar.slice( match[0].length ) || soFar;
 			}
 			groups.push( tokens = [] );
 		}
diff --git a/test/unit/selector.js b/test/unit/selector.js
index aa6ebd44..73d78471 100644
--- a/test/unit/selector.js
+++ b/test/unit/selector.js
@@ -164,7 +164,7 @@ test("XML Document Selectors", function() {
 });
 
 test("broken", function() {
-	expect( 21 );
+	expect( 22 );
 
 	function broken( name, selector ) {
 		raises(function() {
@@ -183,6 +183,7 @@ test("broken", function() {
 	broken( "Broken Selector", "{}" );
 	broken( "Broken Selector", "," );
 	broken( "Broken Selector", ",a" );
+	broken( "Broken Selector", "a," );
 	// Hangs on IE 9 if regular expression is inefficient
 	broken( "Broken Selector", "[id=012345678901234567890123456789");
 	broken( "Doesn't exist", ":visble" );