Accept CSS url()s without quotes.

grit/gather/chrome_html.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Prepares a Chrome HTML file by inlining resources and adding references to
 high DPI resources and removing references to unsupported scale factors.
 
 This is a small gatherer that takes a HTML file, looks for src attributes
 and inlines the specified file, producing one HTML file with no external
@@ skipping 15 matching lines @@
 
 # Distribution string to replace with distribution.
 DIST_SUBSTR = '%DISTRIBUTION%'
 
 
 # Matches a chrome theme source URL.
 _THEME_SOURCE = lazy_re.compile('chrome://theme/IDR_[A-Z0-9_]*')
 # Matches CSS image urls with the capture group 'filename'.
 _CSS_IMAGE_URLS = lazy_re.compile(
     '(?P<attribute>content|background|[\w-]*-image):[ ]*' +
-    'url\((?:\'|\")(?P<filename>[^"\'\)\(]*)(?:\'|\")')
+    'url\((?P<quote>"|\'|)(?P<filename>[^"\'()]*)(?P=quote)')
 # Matches CSS image sets.
 _CSS_IMAGE_SETS = lazy_re.compile(
     '(?P<attribute>content|background|[\w-]*-image):[ ]*' +
         '-webkit-image-set\((?P<images>' +
-        '([,\n ]*url\((\'|\")[^"\'\)\(]*(\'|\")\)[ ]*[0-9.]*x)*)\)',
+        '([,\n ]*url\((?P<quote>"|\'|)[^"\'()]*(?P=quote)\)[ ]*[0-9.]*x)*)\)',
     re.MULTILINE)
 # Matches a single image in a CSS image set with the capture group scale.
 _CSS_IMAGE_SET_IMAGE = lazy_re.compile(
-    '[,\n ]*url\((\'|\")[^"\'\)\(]*(\'|\")\)[ ]*(?P<scale>[0-9.]*x)',
+    '[,\n ]*url\((?P<quote>"|\'|)[^"\'()]*(?P=quote)\)[ ]*(?P<scale>[0-9.]*x)',
     re.MULTILINE)
 
 
 def InsertImageSet(
     src_match, base_path, scale_factors, distribution):
   """Regex replace function which inserts -webkit-image-set.
 
   Takes a regex match for url('path'). If the file is local, checks for
   files of the same name in folders corresponding to the supported scale
   factors. If the file is from a chrome://theme/ source, inserts the
@@ skipping 166 matching lines @@
           allow_external_script = self.allow_external_script_,
           rewrite_function=lambda fp, t, d: ProcessImageSets(
               fp, t, self.scale_factors_, d))
     else:
       distribution = html_inline.GetDistribution()
       self.inlined_text_ = ProcessImageSets(
           os.path.dirname(filename),
           util.ReadFile(filename, 'utf-8'),
           self.scale_factors_,
           distribution)