web/assets/libs/ckeditor/4.6.7/plugins/ajax/plugin.js

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/* global ActiveXObject */
/**
 * @license Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or http://ckeditor.com/license
 */

/**
 * @fileOverview Defines the {@link CKEDITOR.ajax} object, which stores Ajax methods for
 *		data loading.
 */

( function() {
	CKEDITOR.plugins.add( 'ajax', {
		requires: 'xml'
	} );

	/**
	 * Ajax methods for data loading.
	 *
	 * @class
	 * @singleton
	 */
	CKEDITOR.ajax = ( function() {
		function createXMLHttpRequest() {
			// In IE, using the native XMLHttpRequest for local files may throw
			// "Access is Denied" errors.
			if ( !CKEDITOR.env.ie || location.protocol != 'file:' ) {
				try {
					return new XMLHttpRequest();
				} catch ( e ) {
				}
			}

			try {
				return new ActiveXObject( 'Msxml2.XMLHTTP' );
			} catch ( e ) {}
			try {
				return new ActiveXObject( 'Microsoft.XMLHTTP' );
			} catch ( e ) {}

			return null;
		}

		function checkStatus( xhr ) {
			// HTTP Status Codes:
			//	 2xx : Success
			//	 304 : Not Modified
			//	   0 : Returned when running locally (file://)
			//	1223 : IE may change 204 to 1223 (see http://dev.jquery.com/ticket/1450)

			return ( xhr.readyState == 4 && ( ( xhr.status >= 200 && xhr.status < 300 ) || xhr.status == 304 || xhr.status === 0 || xhr.status == 1223 ) );
		}

		function getResponseText( xhr ) {
			if ( checkStatus( xhr ) )
				return xhr.responseText;
			return null;
		}

		function getResponseXml( xhr ) {