Adding ChromeVox as a component extensions (enabled only for ChromeOS, for no...

chrome/browser/resources/access_chromevox/scripts/loader.js

+// Copyright (c) 2011 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.
+
+/**
+ * @fileoverview The script chooser loads any page specific enhancement
+ * scripts that are applicable to the page the user is currently on.
+ */
+
+goog.provide('cvox.SiteSpecificEnhancements');
+
+var ENHANCEMENT_SCRIPTS_BASE_URL =
+      'http://www.gstatic.com/accessibility/javascript/ext/';
+
+/**
+ * Loads site specific enhancement scripts.
+ */
+cvox.SiteSpecificEnhancements.load = function() {
+  // Append this to the end of a remote URL to force it to bypass the cache
+  // and be redownloaded.
+  var forceRedownload = '?' + new Date().getTime();
+
+  function loadScript(src) {
+    var theScript = document.createElement('script');
+    theScript.type = 'text/javascript';
+    if (src.substr(0, 4) == 'http') {
+      theScript.src = src + forceRedownload;
+    } else if (ENHANCEMENT_SCRIPTS_BASE_URL) {
+      theScript.src = ENHANCEMENT_SCRIPTS_BASE_URL + src + forceRedownload;
+    } else {
+      theScript.src = chrome.extension.getURL(src) + forceRedownload;
+    }
+    document.getElementsByTagName('head')[0].appendChild(theScript);
+  }
+
+  var currentURL = document.baseURI;
+
+  if ((currentURL.indexOf('http://www.google.com/search?') == 0) ||
+      (currentURL.indexOf('http://www.google.com/webhp') == 0) ||
+      (currentURL.indexOf('http://www.google.com/#') == 0) ||
+      (currentURL == 'http://www.google.com/')) {
+    // Google Instant Search
+    loadScript('instant.js');
+  } else if (currentURL.indexOf('https://mail.google.com/mail/') == 0) {
+    // GMail
+    loadScript('gmail_api.js');
+    loadScript('gmail.js');
+  } else if ((currentURL.indexOf('http://books.google.com/ebooks?id=') == 0) &&
+      (currentURL.indexOf('&printsec=frontcover&output=reader') != -1)) {
+    // Google Books Web Reader
+    loadScript('booksReader_api.js');
+    loadScript('booksReader.js');
+  } else if (currentURL.indexOf('http://news.google.com/') == 0) {
+    // News
+    loadScript('news/axsEnableNews.js');
+  }
+};