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 <?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) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * @see Zend_Filter_Interface
  */
 // require_once 'Zend/Filter/Interface.php';
 
 /**
  * @category   Zend
  * @package    Zend_Filter
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Filter_StringTrim implements Zend_Filter_Interface
 {
     /**
      * List of characters provided to the trim() function
      *
      * If this is null, then trim() is called with no specific character list,
      * and its default behavior will be invoked, trimming whitespace.
      *
      * @var string|null
      */
     protected $_charList;
 
     /**
      * Sets filter options
      *
      * @param  string|array|Zend_Config $options
      * @return void
      */
     public function __construct($options = null)
     {
         if ($options instanceof Zend_Config) {
             $options = $options->toArray();
         } else if (!is_array($options)) {
             $options          = func_get_args();
             $temp['charlist'] = array_shift($options);
             $options          = $temp;
         }
 
         if (array_key_exists('charlist', $options)) {
             $this->setCharList($options['charlist']);
         }
     }
 
     /**
      * Returns the charList option
      *
      * @return string|null
      */
     public function getCharList()
     {
         return $this->_charList;
     }
 
     /**
      * Sets the charList option
      *
      * @param  string|null $charList
      * @return Zend_Filter_StringTrim Provides a fluent interface
      */
     public function setCharList($charList)
     {
         $this->_charList = $charList;
         return $this;
     }
 
     /**
      * Defined by Zend_Filter_Interface
      *
      * Returns the string $value with characters stripped from the beginning and end
      *
      * @param  string $value
      * @return string
      */
     public function filter($value)
     {
         if (null === $this->_charList) {
             return $this->_unicodeTrim((string) $value);
         } else {
             return $this->_unicodeTrim((string) $value, $this->_charList);
         }
     }
 
     /**
      * Unicode aware trim method
      * Fixes a PHP problem
      *
      * @param string $value
      * @param string $charlist
      * @return string
      */
     protected function _unicodeTrim($value, $charlist = '\\\\s')
     {
         $chars = preg_replace(
             array( '/[\^\-\]\\\]/S', '/\\\{4}/S', '/\//'),
             array( '\\\\\\0', '\\', '\/' ),
             $charlist
         );
 
         $pattern = '^[' . $chars . ']*|[' . $chars . ']*$';
         return preg_replace("/$pattern/sSD", '', $value);
     }
 }