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   1  <?php
   2  
   3  /*
   4   * This file is part of SwiftMailer.
   5   * (c) 2004-2009 Chris Corbyn
   6   *
   7   * For the full copyright and license information, please view the LICENSE
   8   * file that was distributed with this source code.
   9   */
  10  
  11  /**
  12   * Standard factory for creating CharacterReaders.
  13   *
  14   * @author Chris Corbyn
  15   */
  16  class Swift_CharacterReaderFactory_SimpleCharacterReaderFactory implements Swift_CharacterReaderFactory
  17  {
  18      /**
  19       * A map of charset patterns to their implementation classes.
  20       *
  21       * @var array
  22       */
  23      private static $_map = array();
  24  
  25      /**
  26       * Factories which have already been loaded.
  27       *
  28       * @var Swift_CharacterReaderFactory[]
  29       */
  30      private static $_loaded = array();
  31  
  32      /**
  33       * Creates a new CharacterReaderFactory.
  34       */
  35      public function __construct()
  36      {
  37          $this->init();
  38      }
  39  
  40      public function __wakeup()
  41      {
  42          $this->init();
  43      }
  44  
  45      public function init()
  46      {
  47          if (count(self::$_map) > 0) {
  48              return;
  49          }
  50  
  51          $prefix = 'Swift_CharacterReader_';
  52  
  53          $singleByte = array(
  54              'class' => $prefix.'GenericFixedWidthReader',
  55              'constructor' => array(1),
  56              );
  57  
  58          $doubleByte = array(
  59              'class' => $prefix.'GenericFixedWidthReader',
  60              'constructor' => array(2),
  61              );
  62  
  63          $fourBytes = array(
  64              'class' => $prefix.'GenericFixedWidthReader',
  65              'constructor' => array(4),
  66              );
  67  
  68          // Utf-8
  69          self::$_map['utf-?8'] = array(
  70              'class' => $prefix.'Utf8Reader',
  71              'constructor' => array(),
  72              );
  73  
  74          //7-8 bit charsets
  75          self::$_map['(us-)?ascii'] = $singleByte;
  76          self::$_map['(iso|iec)-?8859-?[0-9]+'] = $singleByte;
  77          self::$_map['windows-?125[0-9]'] = $singleByte;
  78          self::$_map['cp-?[0-9]+'] = $singleByte;
  79          self::$_map['ansi'] = $singleByte;
  80          self::$_map['macintosh'] = $singleByte;
  81          self::$_map['koi-?7'] = $singleByte;
  82          self::$_map['koi-?8-?.+'] = $singleByte;
  83          self::$_map['mik'] = $singleByte;
  84          self::$_map['(cork|t1)'] = $singleByte;
  85          self::$_map['v?iscii'] = $singleByte;
  86  
  87          //16 bits
  88          self::$_map['(ucs-?2|utf-?16)'] = $doubleByte;
  89  
  90          //32 bits
  91          self::$_map['(ucs-?4|utf-?32)'] = $fourBytes;
  92  
  93          // Fallback
  94          self::$_map['.*'] = $singleByte;
  95      }
  96  
  97      /**
  98       * Returns a CharacterReader suitable for the charset applied.
  99       *
 100       * @param string $charset
 101       *
 102       * @return Swift_CharacterReader
 103       */
 104      public function getReaderFor($charset)
 105      {
 106          $charset = trim(strtolower($charset));
 107          foreach (self::$_map as $pattern => $spec) {
 108              $re = '/^'.$pattern.'$/D';
 109              if (preg_match($re, $charset)) {
 110                  if (!array_key_exists($pattern, self::$_loaded)) {
 111                      $reflector = new ReflectionClass($spec['class']);
 112                      if ($reflector->getConstructor()) {
 113                          $reader = $reflector->newInstanceArgs($spec['constructor']);
 114                      } else {
 115                          $reader = $reflector->newInstance();
 116                      }
 117                      self::$_loaded[$pattern] = $reader;
 118                  }
 119  
 120                  return self::$_loaded[$pattern];
 121              }
 122          }
 123      }
 124  }