Lazy load chrome.* APIs

chrome/renderer/resources/extensions/utils.js

 // 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.
 
+var chrome = requireNative('chrome').GetChrome();

[not at google - send to devlin, 2013/01/24 21:10:12]

Just curious: is there a particular reason why you're doing this rather than
getting it from window.chrome (for all cases where you've done this)?

[cduvall, 2013/01/24 22:15:15]

I think since they are being loaded differently they no longer have access to
window.chrome.

+
 function forEach(dict, f) {
   for (key in dict) {
     if (dict.hasOwnProperty(key))
       f(key, dict[key]);
   }
 }
 
 // Assuming |array_of_dictionaries| is structured like this:
 // [{id: 1, ... }, {id: 2, ...}, ...], you can use
 // lookup(array_of_dictionaries, 'id', 2) to get the dictionary with id == 2.
 function lookup(array_of_dictionaries, field, value) {
   var filter = function (dict) {return dict[field] == value;};
   var matches = array_of_dictionaries.filter(filter);
   if (matches.length == 0) {
     return undefined;
   } else if (matches.length == 1) {
     return matches[0]
   } else {
     throw new Error("Failed lookup of field '" + field + "' with value '" +
                     value + "'");
   }
 }
 
+function loadRefDependency(ref) {
+  var parts = ref.split(".");
+  return chrome[parts.slice(0, parts.length - 1).join(".")];

[not at google - send to devlin, 2013/01/24 21:10:12]

So this forces the object to be loaded? What if |ref| has no dots in it (e.g. a
ref into the current namespace)?

[cduvall, 2013/01/24 22:15:15]

This will just do nothing if its called for a ref in the current namespace
(because it's already loaded). It will just access chrome['']. This is bad if
the result is used, so I'm adding a TODO for now.

+}
+
 exports.forEach = forEach;
+exports.loadRefDependency = loadRefDependency;
 exports.lookup = lookup;