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// 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.
/**
* @fileoverview Responsible for loading scripts into the inject context.
*/
goog.provide('cvox.InjectedScriptLoader');
/** @constructor */
cvox.InjectedScriptLoader = function() { };
/**
* Loads a dictionary of file contents for Javascript files.
* @param {Array.<string>} files A list of file names.
* @param {function(Object.<string,string>)} done A function called when all
* the files have been loaded. Called with the code map as the first
* parameter.
*/
cvox.InjectedScriptLoader.fetchCode = function(files, done) {
var code = {};
var waiting = files.length;
var startTime = new Date();
var loadScriptAsCode = function(src) {
// 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 = chrome.extension.getURL(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.
var debugSrc = src.replace('closure/../', '');
// The 'chromevox' id is only used in the DevTools instead of a long
// extension id.
scriptText += '\n//# sourceURL= chrome-extension://chromevox/' +
debugSrc + '\n';
code[src] = scriptText;
waiting--;
if (waiting == 0) {
done(code);
}
}
};
xhr.open('GET', url);
xhr.send(null);
}
files.forEach(function(f) { loadScriptAsCode(f); });
};
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