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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 <aidan@php.net>
  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 string $class Class to load
  36       * @return bool
  37       */
  38      public static function autoload($class)
  39      {
  40          $file = HTMLPurifier_Bootstrap::getPath($class);
  41          if (!$file) {
  42              return false;
  43          }
  44          // Technically speaking, it should be ok and more efficient to
  45          // just do 'require', but Antonio Parraga reports that with
  46          // Zend extensions such as Zend debugger and APC, this invariant
  47          // may be broken.  Since we have efficient alternatives, pay
  48          // the cost here and avoid the bug.
  49          require_once HTMLPURIFIER_PREFIX . '/' . $file;
  50          return true;
  51      }
  52  
  53      /**
  54       * Returns the path for a specific class.
  55       * @param string $class Class path to get
  56       * @return string
  57       */
  58      public static function getPath($class)
  59      {
  60          if (strncmp('HTMLPurifier', $class, 12) !== 0) {
  61              return false;
  62          }
  63          // Custom implementations
  64          if (strncmp('HTMLPurifier_Language_', $class, 22) === 0) {
  65              $code = str_replace('_', '-', substr($class, 22));
  66              $file = 'HTMLPurifier/Language/classes/' . $code . '.php';
  67          } else {
  68              $file = str_replace('_', '/', $class) . '.php';
  69          }
  70          if (!file_exists(HTMLPURIFIER_PREFIX . '/' . $file)) {
  71              return false;
  72          }
  73          return $file;
  74      }
  75  
  76      /**
  77       * "Pre-registers" our autoloader on the SPL stack.
  78       */
  79      public static function registerAutoload()
  80      {
  81          $autoload = array('HTMLPurifier_Bootstrap', 'autoload');
  82          if (($funcs = spl_autoload_functions()) === false) {
  83              spl_autoload_register($autoload);
  84          } elseif (function_exists('spl_autoload_unregister')) {
  85              if (version_compare(PHP_VERSION, '5.3.0', '>=')) {
  86                  // prepend flag exists, no need for shenanigans
  87                  spl_autoload_register($autoload, true, true);
  88              } else {
  89                  $buggy  = version_compare(PHP_VERSION, '5.2.11', '<');
  90                  $compat = version_compare(PHP_VERSION, '5.1.2', '<=') &&
  91                            version_compare(PHP_VERSION, '5.1.0', '>=');
  92                  foreach ($funcs as $func) {
  93                      if ($buggy && is_array($func)) {
  94                          // :TRICKY: There are some compatibility issues and some
  95                          // places where we need to error out
  96                          $reflector = new ReflectionMethod($func[0], $func[1]);
  97                          if (!$reflector->isStatic()) {
  98                              throw new Exception(
  99                                  'HTML Purifier autoloader registrar is not compatible
 100                                  with non-static object methods due to PHP Bug #44144;
 101                                  Please do not use HTMLPurifier.autoload.php (or any
 102                                  file that includes this file); instead, place the code:
 103                                  spl_autoload_register(array(\'HTMLPurifier_Bootstrap\', \'autoload\'))
 104                                  after your own autoloaders.'
 105                              );
 106                          }
 107                          // Suprisingly, spl_autoload_register supports the
 108                          // Class::staticMethod callback format, although call_user_func doesn't
 109                          if ($compat) {
 110                              $func = implode('::', $func);
 111                          }
 112                      }
 113                      spl_autoload_unregister($func);
 114                  }
 115                  spl_autoload_register($autoload);
 116                  foreach ($funcs as $func) {
 117                      spl_autoload_register($func);
 118                  }
 119              }
 120          }
 121      }
 122  }
 123  
 124  // vim: et sw=4 sts=4