<?php

/*

 * This file is part of SwiftMailer.

 * (c) 2004-2009 Chris Corbyn

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */

/**

 * Standard factory for creating CharacterReaders.

 * @package Swift

 * @subpackage Encoder

 * @author Chris Corbyn

 */

class Swift_CharacterReaderFactory_SimpleCharacterReaderFactory

  implements Swift_CharacterReaderFactory

{

  /**

   * A map of charset patterns to their implementation classes.

   * @var array

   * @access private

   */

  private $_map = array();

  /**

   * Factories which have already been loaded.

   * @var Swift_CharacterReaderFactory[]

   * @access private

   */

  private $_loaded = array();

  /**

   * Creates a new CharacterReaderFactory.

   */

  public function __construct()

  {

    $prefix = 'Swift_CharacterReader_';

    $singleByte = array(

      'class' => $prefix . 'GenericFixedWidthReader',

      'constructor' => array(1)

      );

    $doubleByte = array(

      'class' => $prefix . 'GenericFixedWidthReader',

      'constructor' => array(2)

      );

    $fourBytes = array(

      'class' => $prefix . 'GenericFixedWidthReader',

      'constructor' => array(4)

      );

    //Utf-8

    $this->_map['utf-?8'] = array(

      'class' => $prefix . 'Utf8Reader',

      'constructor' => array()

      );

    //7-8 bit charsets

    $this->_map['(us-)?ascii'] = $singleByte;

    $this->_map['(iso|iec)-?8859-?[0-9]+'] = $singleByte;

    $this->_map['windows-?125[0-9]'] = $singleByte;

    $this->_map['cp-?[0-9]+'] = $singleByte;

    $this->_map['ansi'] = $singleByte;

    $this->_map['macintosh'] = $singleByte;

    $this->_map['koi-?7'] = $singleByte;

    $this->_map['koi-?8-?.+'] = $singleByte;

    $this->_map['mik'] = $singleByte;

    $this->_map['(cork|t1)'] = $singleByte;

    $this->_map['v?iscii'] = $singleByte;

    //16 bits

    $this->_map['(ucs-?2|utf-?16)'] = $doubleByte;

    //32 bits

    $this->_map['(ucs-?4|utf-?32)'] = $fourBytes;

    //Fallback

    $this->_map['.*'] = $singleByte;

  }

  /**

   * Returns a CharacterReader suitable for the charset applied.

   * @param string $charset

   * @return Swift_CharacterReader

   */

  public function getReaderFor($charset)

  {

    $charset = trim(strtolower($charset));

    foreach ($this->_map as $pattern => $spec)

    {

      $re = '/^' . $pattern . '$/D';

      if (preg_match($re, $charset))

      {

        if (!array_key_exists($pattern, $this->_loaded))

        {

          $reflector = new ReflectionClass($spec['class']);

          if ($reflector->getConstructor())

          {

            $reader = $reflector->newInstanceArgs($spec['constructor']);

          }

          else

          {

            $reader = $reflector->newInstance();

          }

          $this->_loaded[$pattern] = $reader;

        }

        return $this->_loaded[$pattern];

      }

    }

  }

}