mirror of
https://github.com/ezyang/htmlpurifier.git
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0b9db1f54b
HTML Purifier loads itself as the first autoload function by unregistering all existing functions and re-registering them after registering itself. Originally an exception was thrown when a non-static object method was encountered as the behaviour of spl_autoload_functions() did not return the object instance, but only the class name. This was filed on PHP bugs (#44144). The bug was fixed for PHP >= 5.2.11 and >= 5.3 Signed-off-by: Nick Pope <nick@nickpope.me.uk> Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
100 lines
3.6 KiB
PHP
100 lines
3.6 KiB
PHP
<?php
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// constants are slow, so we use as few as possible
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if (!defined('HTMLPURIFIER_PREFIX')) {
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define('HTMLPURIFIER_PREFIX', realpath(dirname(__FILE__) . '/..'));
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}
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// accomodations for versions earlier than 5.0.2
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// borrowed from PHP_Compat, LGPL licensed, by Aidan Lister <aidan@php.net>
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if (!defined('PHP_EOL')) {
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switch (strtoupper(substr(PHP_OS, 0, 3))) {
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case 'WIN':
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define('PHP_EOL', "\r\n");
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break;
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case 'DAR':
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define('PHP_EOL', "\r");
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break;
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default:
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define('PHP_EOL', "\n");
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}
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}
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/**
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* Bootstrap class that contains meta-functionality for HTML Purifier such as
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* the autoload function.
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*
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* @note
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* This class may be used without any other files from HTML Purifier.
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*/
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class HTMLPurifier_Bootstrap
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{
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/**
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* Autoload function for HTML Purifier
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* @param $class Class to load
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*/
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public static function autoload($class) {
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$file = HTMLPurifier_Bootstrap::getPath($class);
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if (!$file) return false;
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require HTMLPURIFIER_PREFIX . '/' . $file;
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return true;
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}
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/**
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* Returns the path for a specific class.
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*/
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public static function getPath($class) {
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if (strncmp('HTMLPurifier', $class, 12) !== 0) return false;
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// Custom implementations
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if (strncmp('HTMLPurifier_Language_', $class, 22) === 0) {
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$code = str_replace('_', '-', substr($class, 22));
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$file = 'HTMLPurifier/Language/classes/' . $code . '.php';
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} else {
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$file = str_replace('_', '/', $class) . '.php';
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}
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if (!file_exists(HTMLPURIFIER_PREFIX . '/' . $file)) return false;
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return $file;
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}
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/**
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* "Pre-registers" our autoloader on the SPL stack.
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*/
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public static function registerAutoload() {
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$autoload = array('HTMLPurifier_Bootstrap', 'autoload');
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if ( ($funcs = spl_autoload_functions()) === false ) {
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spl_autoload_register($autoload);
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} elseif (function_exists('spl_autoload_unregister')) {
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$buggy = version_compare(PHP_VERSION, '5.2.11', '<');
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$compat = version_compare(PHP_VERSION, '5.1.2', '<=') &&
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version_compare(PHP_VERSION, '5.1.0', '>=');
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foreach ($funcs as $func) {
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if ($buggy && is_array($func)) {
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// :TRICKY: There are some compatibility issues and some
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// places where we need to error out
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$reflector = new ReflectionMethod($func[0], $func[1]);
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if (!$reflector->isStatic()) {
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throw new Exception('
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HTML Purifier autoloader registrar is not compatible
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with non-static object methods due to PHP Bug #44144;
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Please do not use HTMLPurifier.autoload.php (or any
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file that includes this file); instead, place the code:
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spl_autoload_register(array(\'HTMLPurifier_Bootstrap\', \'autoload\'))
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after your own autoloaders.
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');
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}
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// Suprisingly, spl_autoload_register supports the
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// Class::staticMethod callback format, although call_user_func doesn't
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if ($compat) $func = implode('::', $func);
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}
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spl_autoload_unregister($func);
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}
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spl_autoload_register($autoload);
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foreach ($funcs as $func) spl_autoload_register($func);
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}
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}
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}
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// vim: et sw=4 sts=4
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