chrome/test/data/extensions/subscribe_page_action/sniff_common.js

   1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // The possible log levels.
   6 var logLevels = {
   7     "none": 0,
   8     "error": 1,
   9     "info": 2
  10 };
  11
  12 // Defines the current log level. Values other than "none" are for debugging
  13 // only and should at no point be checked in.
  14 var currentLogLevel = logLevels.none;
  15
  16 function containsFeed(doc) {
  17   debugMsg(logLevels.info, "containsFeed called");
  18
  19   // Find all the RSS link elements.
  20   var result = doc.evaluate(
  21       '//*[local-name()="rss" or local-name()="feed" or local-name()="RDF"]',
  22       doc, null, 0, null);
  23
  24   if (!result) {
  25     debugMsg(logLevels.info, "exiting: document.evaluate returned no results");
  26     return false;  // This is probably overly defensive, but whatever.
  27   }
  28
  29   var node = result.iterateNext();
  30
  31   if (!node) {
  32     debugMsg(logLevels.info, "returning: iterateNext() returned no nodes");
  33     return false;  // No RSS tags were found.
  34   }
  35
  36   // The feed for arab dash jokes dot net, for example, contains
  37   // a feed that is a child of the body tag so we continue only if the
  38   // node contains no parent or if the parent is the body tag.
  39   if (node.parentElement && node.parentElement.tagName != "BODY") {
  40     debugMsg(logLevels.info, "exiting: parentElement that's not BODY");
  41     return false;
  42   }
  43
  44   debugMsg(logLevels.info, "Found feed");
  45
  46   return true;
  47 }
  48
  49 function debugMsg(loglevel, text) {
  50   if (loglevel <= currentLogLevel) {
  51     console.log("RSS Subscription extension: " + text);
  52   }
  53 }