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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';
 /**
  * @see Zend_Locale
  */
 // require_once 'Zend/Locale.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_Alpha implements Zend_Filter_Interface
 {
     /**
      * Whether to allow white space characters; off by default
      *
      * @var boolean
      * @deprecated
      */
     public $allowWhiteSpace;
 
     /**
      * Is PCRE is compiled with UTF-8 and Unicode support
      *
      * @var mixed
      **/
     protected static $_unicodeEnabled;
 
     /**
      * Locale in browser.
      *
      * @var Zend_Locale object
      */
     protected $_locale;
 
     /**
      * The Alphabet means english alphabet.
      *
      * @var boolean
      */
     protected static $_meansEnglishAlphabet;
 
     /**
      * Sets default option values for this instance
      *
      * @param  boolean $allowWhiteSpace
      * @return void
      */
     public function __construct($allowWhiteSpace = false)
     {
         if ($allowWhiteSpace instanceof Zend_Config) {
             $allowWhiteSpace = $allowWhiteSpace->toArray();
         } else if (is_array($allowWhiteSpace)) {
             if (array_key_exists('allowwhitespace', $allowWhiteSpace)) {
                 $allowWhiteSpace = $allowWhiteSpace['allowwhitespace'];
             } else {
                 $allowWhiteSpace = false;
             }
         }
 
         $this->allowWhiteSpace = (boolean) $allowWhiteSpace;
         if (null === self::$_unicodeEnabled) {
             self::$_unicodeEnabled = (@preg_match('/\pL/u', 'a')) ? true : false;
         }
 
         if (null === self::$_meansEnglishAlphabet) {
             $this->_locale = new Zend_Locale('auto');
             self::$_meansEnglishAlphabet = in_array($this->_locale->getLanguage(),
                                                     array('ja', 'ko', 'zh')
                                                     );
         }
 
     }
 
     /**
      * Returns the allowWhiteSpace option
      *
      * @return boolean
      */
     public function getAllowWhiteSpace()
     {
         return $this->allowWhiteSpace;
     }
 
     /**
      * Sets the allowWhiteSpace option
      *
      * @param boolean $allowWhiteSpace
      * @return Zend_Filter_Alpha Provides a fluent interface
      */
     public function setAllowWhiteSpace($allowWhiteSpace)
     {
         $this->allowWhiteSpace = (boolean) $allowWhiteSpace;
         return $this;
     }
 
     /**
      * Defined by Zend_Filter_Interface
      *
      * Returns the string $value, removing all but alphabetic characters
      *
      * @param  string $value
      * @return string
      */
     public function filter($value)
     {
         $whiteSpace = $this->allowWhiteSpace ? '\s' : '';
         if (!self::$_unicodeEnabled) {
             // POSIX named classes are not supported, use alternative a-zA-Z match
             $pattern = '/[^a-zA-Z' . $whiteSpace . ']/';
         } else if (self::$_meansEnglishAlphabet) {
             //The Alphabet means english alphabet.
             $pattern = '/[^a-zA-Z'  . $whiteSpace . ']/u';
         } else {
             //The Alphabet means each language's alphabet.
             $pattern = '/[^\p{L}' . $whiteSpace . ']/u';
         }
 
         return preg_replace($pattern, '', (string) $value);
     }
 }