<?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: PregReplace.php 21085 2010-02-18 21:08:39Z thomas $

 */

/**

 * @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_PregReplace implements Zend_Filter_Interface

{

    /**

     * Pattern to match

     * @var mixed

     */

    protected $_matchPattern = null;

    /**

     * Replacement pattern

     * @var mixed

     */

    protected $_replacement = '';

    /**

     * Is unicode enabled?

     *

     * @var bool

     */

    static protected $_unicodeSupportEnabled = null;

    /**

     * Is Unicode Support Enabled Utility function

     *

     * @return bool

     */

    static public function isUnicodeSupportEnabled()

    {

        if (self::$_unicodeSupportEnabled === null) {

            self::_determineUnicodeSupport();

        }

        return self::$_unicodeSupportEnabled;

    }

    /**

     * Method to cache the regex needed to determine if unicode support is available

     *

     * @return bool

     */

    static protected function _determineUnicodeSupport()

    {

        self::$_unicodeSupportEnabled = (@preg_match('/\pL/u', 'a')) ? true : false;

    }

    /**

     * Constructor

     * Supported options are

     *     'match'   => matching pattern

     *     'replace' => replace with this

     *

     * @param  string|array $options

     * @return void

     */

    public function __construct($options = null)

    {

        if ($options instanceof Zend_Config) {

            $options = $options->toArray();

        } else if (!is_array($options)) {

            $options = func_get_args();

            $temp    = array();

            if (!empty($options)) {

                $temp['match'] = array_shift($options);

            }

            if (!empty($options)) {

                $temp['replace'] = array_shift($options);

            }

            $options = $temp;

        }

        if (array_key_exists('match', $options)) {

            $this->setMatchPattern($options['match']);

        }

        if (array_key_exists('replace', $options)) {

            $this->setReplacement($options['replace']);

        }

    }

    /**

     * Set the match pattern for the regex being called within filter()

     *

     * @param mixed $match - same as the first argument of preg_replace

     * @return Zend_Filter_PregReplace

     */

    public function setMatchPattern($match)

    {

        $this->_matchPattern = $match;

        return $this;

    }

    /**

     * Get currently set match pattern

     *

     * @return string

     */

    public function getMatchPattern()

    {

        return $this->_matchPattern;

    }

    /**

     * Set the Replacement pattern/string for the preg_replace called in filter

     *

     * @param mixed $replacement - same as the second argument of preg_replace

     * @return Zend_Filter_PregReplace

     */

    public function setReplacement($replacement)

    {

        $this->_replacement = $replacement;

        return $this;

    }

    /**

     * Get currently set replacement value

     *

     * @return string

     */

    public function getReplacement()

    {

        return $this->_replacement;

    }

    /**

     * Perform regexp replacement as filter

     *

     * @param  string $value

     * @return string

     */

    public function filter($value)

    {

        if ($this->_matchPattern == null) {

            require_once 'Zend/Filter/Exception.php';

            throw new Zend_Filter_Exception(get_class($this) . ' does not have a valid MatchPattern set.');

        }

        return preg_replace($this->_matchPattern, $this->_replacement, $value);

    }

}