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   1  <?php
   2  
   3  // constants are slow, so we use as few as possible
   4  if (!defined('HTMLPURIFIER_PREFIX')) {
   5      define('HTMLPURIFIER_PREFIX', realpath(dirname(__FILE__) . '/..'));
   6  }
   7  
   8  // accomodations for versions earlier than 5.0.2
   9  // borrowed from PHP_Compat, LGPL licensed, by Aidan Lister <[email protected]>
  10  if (!defined('PHP_EOL')) {
  11      switch (strtoupper(substr(PHP_OS, 0, 3))) {
  12          case 'WIN':
  13              define('PHP_EOL', "\r\n");
  14              break;
  15          case 'DAR':
  16              define('PHP_EOL', "\r");
  17              break;
  18          default:
  19              define('PHP_EOL', "\n");
  20      }
  21  }
  22  
  23  /**
  24   * Bootstrap class that contains meta-functionality for HTML Purifier such as
  25   * the autoload function.
  26   *
  27   * @note
  28   *      This class may be used without any other files from HTML Purifier.
  29   */
  30  class HTMLPurifier_Bootstrap
  31  {
  32  
  33      /**
  34       * Autoload function for HTML Purifier
  35       * @param $class Class to load
  36       */
  37      public static function autoload($class) {
  38          $file = HTMLPurifier_Bootstrap::getPath($class);
  39          if (!$file) return false;
  40          require HTMLPURIFIER_PREFIX . '/' . $file;
  41          return true;
  42      }
  43  
  44      /**
  45       * Returns the path for a specific class.
  46       */
  47      public static function getPath($class) {
  48          if (strncmp('HTMLPurifier', $class, 12) !== 0) return false;
  49          // Custom implementations
  50          if (strncmp('HTMLPurifier_Language_', $class, 22) === 0) {
  51              $code = str_replace('_', '-', substr($class, 22));
  52              $file = 'HTMLPurifier/Language/classes/' . $code . '.php';
  53          } else {
  54              $file = str_replace('_', '/', $class) . '.php';
  55          }
  56          if (!file_exists(HTMLPURIFIER_PREFIX . '/' . $file)) return false;
  57          return $file;
  58      }
  59  
  60      /**
  61       * "Pre-registers" our autoloader on the SPL stack.
  62       */
  63      public static function registerAutoload() {
  64          $autoload = array('HTMLPurifier_Bootstrap', 'autoload');
  65          if ( ($funcs = spl_autoload_functions()) === false ) {
  66              spl_autoload_register($autoload);
  67          } elseif (function_exists('spl_autoload_unregister')) {
  68              $compat = version_compare(PHP_VERSION, '5.1.2', '<=') &&
  69                        version_compare(PHP_VERSION, '5.1.0', '>=');
  70              foreach ($funcs as $func) {
  71                  if (is_array($func)) {
  72                      // :TRICKY: There are some compatibility issues and some
  73                      // places where we need to error out
  74                      $reflector = new ReflectionMethod($func[0], $func[1]);
  75                      if (!$reflector->isStatic()) {
  76                          throw new Exception('
  77                              HTML Purifier autoloader registrar is not compatible
  78                              with non-static object methods due to PHP Bug #44144;
  79                              Please do not use HTMLPurifier.autoload.php (or any
  80                              file that includes this file); instead, place the code:
  81                              spl_autoload_register(array(\'HTMLPurifier_Bootstrap\', \'autoload\'))
  82                              after your own autoloaders.
  83                          ');
  84                      }
  85                      // Suprisingly, spl_autoload_register supports the
  86                      // Class::staticMethod callback format, although call_user_func doesn't
  87                      if ($compat) $func = implode('::', $func);
  88                  }
  89                  spl_autoload_unregister($func);
  90              }
  91              spl_autoload_register($autoload);
  92              foreach ($funcs as $func) spl_autoload_register($func);
  93          }
  94      }
  95  
  96  }
  97  
  98  // vim: et sw=4 sts=4