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efrain |
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<?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 string $class Class to load
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* @return bool
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*/
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public static function autoload($class)
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{
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$file = HTMLPurifier_Bootstrap::getPath($class);
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if (!$file) {
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return false;
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}
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// Technically speaking, it should be ok and more efficient to
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// just do 'require', but Antonio Parraga reports that with
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// Zend extensions such as Zend debugger and APC, this invariant
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// may be broken. Since we have efficient alternatives, pay
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// the cost here and avoid the bug.
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require_once 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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* @param string $class Class path to get
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* @return string
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*/
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public static function getPath($class)
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{
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if (strncmp('HTMLPurifier', $class, 12) !== 0) {
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return false;
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}
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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)) {
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return false;
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}
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return $file;
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}
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/**
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* "Pre-registers" our autoloader on the SPL stack.
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*/
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public static function registerAutoload()
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{
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$autoload = array('HTMLPurifier_Bootstrap', 'autoload');
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if (spl_autoload_functions() === false) {
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spl_autoload_register($autoload);
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} else {
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// prepend flag exists, no need for shenanigans
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spl_autoload_register($autoload, true, true);
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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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