<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

 * This source file is subject to the new BSD license that is bundled

 * with this package in the file LICENSE.txt.

 * It is also available through the world-wide-web at this URL:

 * http://framework.zend.com/license/new-bsd

 * If you did not receive a copy of the license and are unable to

 * obtain it through the world-wide-web, please send an email

 * to license@zend.com so we can send you a copy immediately.

 *

 * @category   Zend

 * @package    Zend_Filter

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @version    $Id: RealPath.php 20096 2010-01-06 02:05:09Z bkarwin $

 */

/**

 * @see Zend_Filter_Interface

 */

require_once 'Zend/Filter/Interface.php';

/**

 * @category   Zend

 * @package    Zend_Filter

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

class Zend_Filter_RealPath implements Zend_Filter_Interface

{

    /**

     * @var boolean $_pathExists

     */

    protected $_exists = true;

    /**

     * Class constructor

     *

     * @param boolean|Zend_Config $options Options to set

     */

    public function __construct($options = true)

    {

        $this->setExists($options);

    }

    /**

     * Returns true if the filtered path must exist

     *

     * @return boolean

     */

    public function getExists()

    {

        return $this->_exists;

    }

    /**

     * Sets if the path has to exist

     * TRUE when the path must exist

     * FALSE when not existing paths can be given

     *

     * @param boolean|Zend_Config $exists Path must exist

     * @return Zend_Filter_RealPath

     */

    public function setExists($exists)

    {

        if ($exists instanceof Zend_Config) {

            $exists = $exists->toArray();

        }

        if (is_array($exists)) {

            if (isset($exists['exists'])) {

                $exists = (boolean) $exists['exists'];

            }

        }

        $this->_exists = (boolean) $exists;

        return $this;

    }

    /**

     * Defined by Zend_Filter_Interface

     *

     * Returns realpath($value)

     *

     * @param  string $value

     * @return string

     */

    public function filter($value)

    {

        $path = (string) $value;

        if ($this->_exists) {

            return realpath($path);

        }

        $realpath = @realpath($path);

        if ($realpath) {

            return $realpath;

        }

        $drive = '';

        if (substr(PHP_OS, 0, 3) == 'WIN') {

            $path = preg_replace('/[\\\\\/]/', DIRECTORY_SEPARATOR, $path);

            if (preg_match('/([a-zA-Z]\:)(.*)/', $path, $matches)) {

                list($fullMatch, $drive, $path) = $matches;

            } else {

                $cwd   = getcwd();

                $drive = substr($cwd, 0, 2);

                if (substr($path, 0, 1) != DIRECTORY_SEPARATOR) {

                    $path = substr($cwd, 3) . DIRECTORY_SEPARATOR . $path;

                }

            }

        } elseif (substr($path, 0, 1) != DIRECTORY_SEPARATOR) {

            $path = getcwd() . DIRECTORY_SEPARATOR . $path;

        }

        $stack = array();

        $parts = explode(DIRECTORY_SEPARATOR, $path);

        foreach ($parts as $dir) {

            if (strlen($dir) && $dir !== '.') {

                if ($dir == '..') {

                    array_pop($stack);

                } else {

                    array_push($stack, $dir);

                }

            }

        }

        return $drive . DIRECTORY_SEPARATOR . implode(DIRECTORY_SEPARATOR, $stack);

    }

}