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// Copyright 2010 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview Code to execute before Closure's base.js.
*
* @author dmazzoni@google.com (Dominic Mazzoni)
*/
/**
* Tell Closure to load JavaScript code from the extension root directory.
* @type {boolean}
*/
window.CLOSURE_BASE_PATH = chrome.extension.getURL('/closure/');
/**
* Tell Closure not to load deps.js; it's included by manifest.json already.
* @type {boolean}
*/
window.CLOSURE_NO_DEPS = true;
/**
* Array of urls that should be included next, in order.
* @type {Array}
* @private
*/
window.queue_ = [];
/**
* Custom function for importing ChromeVox scripts.
* @param {string} src The JS file to import.
* @return {boolean} Whether the script was imported.
*/
window.CLOSURE_IMPORT_SCRIPT = function(src) {
// Only run our version of the import script
// when trying to inject ChromeVox scripts.
if (src.indexOf('chrome-extension://') == 0) {
if (!goog.inHtmlDocument_() ||
goog.dependencies_.written[src]) {
return false;
}
goog.dependencies_.written[src] = true;
function loadNextScript() {
if (goog.global.queue_.length == 0)
return;
var src = goog.global.queue_[0];
if (window.CLOSURE_USE_EXT_MESSAGES) {
var relativeSrc = src.substr(src.indexOf('closure/..') + 11);
chrome.extension.sendMessage(
{'srcFile': relativeSrc},
function(response) {
try {
eval(response['code']);
} catch (e) {
console.error('Script error: ' + e + ' in ' + src);
}
goog.global.queue_ = goog.global.queue_.slice(1);
loadNextScript();
});
return;
}
window.console.log('Using XHR');
// Load the script by fetching its source and running 'eval' on it
// directly, with a magic comment that makes Chrome treat it like it
// loaded normally. Wait until it's fetched before loading the
// next script.
var xhr = new XMLHttpRequest();
var url = src + '?' + new Date().getTime();
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {
var scriptText = xhr.responseText;
// Add a magic comment to the bottom of the file so that
// Chrome knows the name of the script in the JavaScript debugger.
scriptText += '\n//# sourceURL=' + src + '\n';
eval(scriptText);
goog.global.queue_ = goog.global.queue_.slice(1);
loadNextScript();
}
};
xhr.open('GET', url, false);
xhr.send(null);
}
goog.global.queue_.push(src);
if (goog.global.queue_.length == 1) {
loadNextScript();
}
return true;
} else {
return goog.writeScriptTag_(src);
}
};
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