library/HTMLPurifier/Bootstrap.php

   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 $class Class to load
  36      */
  37     public static function autoload($class) {
  38         $file = HTMLPurifier_Bootstrap::getPath($class);
  39         if (!$file) return false;
  40         // Technically speaking, it should be ok and more efficient to
  41         // just do 'require', but Antonio Parraga reports that with
  42         // Zend extensions such as Zend debugger and APC, this invariant
  43         // may be broken.  Since we have efficient alternatives, pay
  44         // the cost here and avoid the bug.
  45         require_once HTMLPURIFIER_PREFIX . '/' . $file;
  46         return true;
  47     }
  48
  49     /**
  50      * Returns the path for a specific class.
  51      */
  52     public static function getPath($class) {
  53         if (strncmp('HTMLPurifier', $class, 12) !== 0) return false;
  54         // Custom implementations
  55         if (strncmp('HTMLPurifier_Language_', $class, 22) === 0) {
  56             $code = str_replace('_', '-', substr($class, 22));
  57             $file = 'HTMLPurifier/Language/classes/' . $code . '.php';
  58         } else {
  59             $file = str_replace('_', '/', $class) . '.php';
  60         }
  61         if (!file_exists(HTMLPURIFIER_PREFIX . '/' . $file)) return false;
  62         return $file;
  63     }
  64
  65     /**
  66      * "Pre-registers" our autoloader on the SPL stack.
  67      */
  68     public static function registerAutoload() {
  69         $autoload = array('HTMLPurifier_Bootstrap', 'autoload');
  70         if ( ($funcs = spl_autoload_functions()) === false ) {
  71             spl_autoload_register($autoload);
  72         } elseif (function_exists('spl_autoload_unregister')) {
  73             $buggy  = version_compare(PHP_VERSION, '5.2.11', '<');
  74             $compat = version_compare(PHP_VERSION, '5.1.2', '<=') &&
  75                       version_compare(PHP_VERSION, '5.1.0', '>=');
  76             foreach ($funcs as $func) {
  77                 if ($buggy && is_array($func)) {
  78                     // :TRICKY: There are some compatibility issues and some
  79                     // places where we need to error out
  80                     $reflector = new ReflectionMethod($func[0], $func[1]);
  81                     if (!$reflector->isStatic()) {
  82                         throw new Exception('
  83                             HTML Purifier autoloader registrar is not compatible
  84                             with non-static object methods due to PHP Bug #44144;
  85                             Please do not use HTMLPurifier.autoload.php (or any
  86                             file that includes this file); instead, place the code:
  87                             spl_autoload_register(array(\'HTMLPurifier_Bootstrap\', \'autoload\'))
  88                             after your own autoloaders.
  89                         ');
  90                     }
  91                     // Suprisingly, spl_autoload_register supports the
  92                     // Class::staticMethod callback format, although call_user_func doesn't
  93                     if ($compat) $func = implode('::', $func);
  94                 }
  95                 spl_autoload_unregister($func);
  96             }
  97             spl_autoload_register($autoload);
  98             foreach ($funcs as $func) spl_autoload_register($func);
  99         }
 100     }
 101
 102 }
 103
 104 // vim: et sw=4 sts=4