From 8f05b9235144f5c88693aec3234e67153359706c Mon Sep 17 00:00:00 2001
From: Jakub Pawlowicz <contact@jakubpawlowicz.com>
Date: Sat, 5 Jul 2014 14:25:37 +0100
Subject: [PATCH] Adds faster quote matching in QuoteScanner.

---
 History.md                |  1 +
 lib/text/quote-scanner.js | 34 +++++++++++++++-------------------
 2 files changed, 16 insertions(+), 19 deletions(-)

diff --git a/History.md b/History.md
index a9c309a5..3ad39143 100644
--- a/History.md
+++ b/History.md
@@ -1,6 +1,7 @@
 [2.2.6 / 2014-xx-xx](https://github.com/GoalSmashers/clean-css/compare/v2.2.5...v2.2.6)
 ==================
 
+* Adds faster quote matching in QuoteScanner.
 * Improves QuoteScanner to handle comments correctly.
 * Fixed issue [#308](https://github.com/GoalSmashers/clean-css/issues/308) - parsing comments in quoted urls.
 * Fixed issue [#311](https://github.com/GoalSmashers/clean-css/issues/311) - leading/trailing decimal points.
diff --git a/lib/text/quote-scanner.js b/lib/text/quote-scanner.js
index 55117534..83dc49f5 100644
--- a/lib/text/quote-scanner.js
+++ b/lib/text/quote-scanner.js
@@ -3,31 +3,26 @@
     this.data = data;
   };
 
-  var findCommentEnd = function(data, matched, start) {
+  var findCommentEnd = function(data, matched, cursor) {
     var commentStartMark = '/*';
     var commentEndMark = '*/';
-    var end = start;
-    while (true) {
-      var from = end;
-
-      end = data.indexOf(matched, from);
-      var commentStart = data.indexOf(commentStartMark, from);
-      var commentEnd = data.indexOf(commentEndMark, from);
+    var escapeMark = '\\';
+    var commentStarted = false;
 
-      if (end > -1 && commentEnd > -1 && commentEnd < end && (commentStart == -1 || commentStart > commentEnd)) {
-        end = commentEnd + 1;
+    while (true) {
+      if (data[cursor] === undefined)
         break;
-      }
-
-      if (end > -1 && data[end - 1] == '\\') {
-        end += 1;
-        continue;
-      } else {
+      if (!commentStarted && data[cursor] == commentEndMark[1] && data[cursor - 1] == commentEndMark[0])
         break;
-      }
+      if (data[cursor] == matched && data[cursor - 1] != escapeMark)
+        break;
+      if (data[cursor] == commentStartMark[1] && data[cursor - 1] == commentStartMark[0])
+        commentStarted = true;
+
+      cursor++;
     }
 
-    return end;
+    return cursor;
   };
 
   QuoteScanner.prototype.each = function(callback) {
@@ -67,7 +62,8 @@
 
       var text = data.substring(nextStart, nextEnd + 1);
       tempData.push(data.substring(cursor, nextStart));
-      callback(text, tempData, nextStart);
+      if (text.length > 0)
+        callback(text, tempData, nextStart);
 
       cursor = nextEnd + 1;
     }
-- 
2.34.1