Add a document describing which C++11 features we allow.

styleguide/c++/chromium-cpp/main.py

+#!/usr/bin/env python
+#
+# Copyright 2014 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 google.appengine.api import memcache
+from google.appengine.api import urlfetch
+import webapp2
+
+import base64
+
+"""A simple appengine app that hosts .html files in src/styleguide/c++ from
+chromium's git repo."""
+
+
+class MainHandler(webapp2.RequestHandler):
+    def get(self):
+        handler = GitilesMirrorHandler()
+        handler.initialize(self.request, self.response)
+        return handler.get("c++11.html")
+
+
+BASE = 'https://chromium.googlesource.com/chromium/src.git/' \
+       '+/master/styleguide/c++/%s?format=TEXT'
+class GitilesMirrorHandler(webapp2.RequestHandler):
+    def get(self, resource):
+        if '..' in resource:  # No path traversal.
+            self.response.write(':-(')
+            return
+
+        url = BASE % resource
+        contents = memcache.get(url)
+        if not contents or self.request.get('bust'):
+            result = urlfetch.fetch(url)
+            if result.status_code != 200:
+                self.response.write('http error %d' % result.status_code)
+                return
+            contents = base64.b64decode(result.content)
+            memcache.set(url, contents, time=5*60)  # seconds
+
+        if resource.endswith('.css'):
+          self.response.headers['Content-Type'] = 'text/css'
+        self.response.write(contents)
+
+
+app = webapp2.WSGIApplication([
+    ('/', MainHandler),
+    ('/(\S+\.(?:css|html))', GitilesMirrorHandler),
+], debug=True)