Docserver: Add support for viewing docs with a codereview patch applied

chrome/common/extensions/docs/server2/patch_servlet.py

+# Copyright 2013 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.
+
+from appengine_url_fetcher import AppEngineUrlFetcher
+from appengine_wrappers import GetAppVersion
+from object_store_creator import ObjectStoreCreator
+#from servlet import Servlet
+
+PATCH_BASEURL = '_patch/'
+PATCH_CHANNEL_NAME = 'trunk'
+
+class PatchServlet(object):
+  '''Servlet which renders patched docs.
+  '''
+  @staticmethod
+  def SplitPatchFromPath(path):
+    if path.startswith(PATCH_BASEURL):
+      remaining_path = path.split(PATCH_BASEURL, 1)[1]
+      if not '/' in remaining_path:
+        return (None, None, None)
+      issue, real_path = remaining_path.split('/', 1)
+      if not issue.isdigit() or len(real_path) == 0:
+        return (None, None, None)
+      return (PATCH_CHANNEL_NAME, issue, real_path)
+    else:
+      return (None, None, None)