here is the code from the import.php file
<?php
/**
* @package Joomla.Platform
*
* @copyright Copyright (C) 2005 - 2011 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('_JEXEC') or die;
// Set the platform root path as a constant if necessary.
if (!defined('JPATH_PLATFORM')) {
define('JPATH_PLATFORM', dirname(__FILE__));
}
// Set the directory separator define if necessary.
if (!defined('DS')) {
define('DS', DIRECTORY_SEPARATOR);
}
// Detect the native operating system type.
$os = strtoupper(substr(PHP_OS, 0, 3));
if (!defined('IS_WIN')) {
define('IS_WIN', ($os === 'WIN') ? true : false);
}
if (!defined('IS_MAC')) {
define('IS_MAC', ($os === 'MAC') ? true : false);
}
if (!defined('IS_UNIX')) {
define('IS_UNIX', (($os !== 'MAC') && ($os !== 'WIN')) ? true : false);
}
// Import the platform version library if necessary.
if (!class_exists('JPlatform')) {
require_once JPATH_PLATFORM.'/platform.php';
}
// Import the library loader if necessary.
if (!class_exists('JLoader')) {
require_once JPATH_PLATFORM.'/loader.php';
}
/**
* Import the base Joomla Platform libraries.
*/
// Import the factory library.
JLoader::import('joomla.factory');
// Import the exception and error handling libraries.
JLoader::import('joomla.error.error');
JLoader::import('joomla.error.exception');
/*
* If the HTTP_HOST environment variable is set we assume a Web request and
* thus we import the request library and most likely clean the request input.
*/
if (isset($_SERVER)) {
JLoader::import('joomla.environment.request');
// If an application flags it doesn't want this, adhere to that.
if (!defined('_JREQUEST_NO_CLEAN')) {
JRequest::clean();
}
}
// Import the base object library.
JLoader::import('joomla.base.object');
// Register classes that don't follow one file per class naming conventions.
JLoader::register('JText', JPATH_PLATFORM.'/joomla/methods.php');
JLoader::register('JRoute', JPATH_PLATFORM.'/joomla/methods.php');
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