<?php

/**

 * Smarty Autoloader

 *

 * @package    Smarty

 */

/**

 * Smarty Autoloader

 *

 * @package    Smarty

 * @author     Uwe Tews

 *             Usage:

 *             require_once '...path/Autoloader.php';

 *             Smarty_Autoloader::register();

 *             $smarty = new Smarty();

 *             Note:       This autoloader is not needed if you use Composer.

 *             Composer will automatically add the classes of the Smarty package to it core autoloader.

 */

class Smarty_Autoloader {

    /**

     * Filepath to Smarty root

     *

     * @var string

     */

    public static $SMARTY_DIR = '';

    /**

     * Filepath to Smarty internal plugins

     *

     * @var string

     */

    public static $SMARTY_SYSPLUGINS_DIR = '';

    /**

     * Array of not existing classes to avoid is_file calls for  already tested classes

     *

     * @var array

     */

    public static $unknown = array();

    /**

     * Array with Smarty core classes and their filename

     *

     * @var array

     */

    public static $rootClasses = array('Smarty' => 'Smarty.class.php',

        'SmartyBC' => 'SmartyBC.class.php',

    );

    private static $syspluginsClasses = array(

        'smarty_config_source' => true,

        'smarty_security' => true,

        'smarty_cacheresource' => true,

        'smarty_compiledresource' => true,

        'smarty_cacheresource_custom' => true,

        'smarty_cacheresource_keyvaluestore' => true,

        'smarty_resource' => true,

        'smarty_resource_custom' => true,

        'smarty_resource_uncompiled' => true,

        'smarty_resource_recompiled' => true,

        'smarty_template_source' => true,

        'smarty_template_compiled' => true,

        'smarty_template_cached' => true,

        'smarty_template_config' => true,

        'smarty_data' => true,

        'smarty_variable' => true,

        'smarty_undefined_variable' => true,

        'smartyexception' => true,

        'smartycompilerexception' => true,

        'smarty_internal_data' => true,

        'smarty_internal_template' => true,

        'smarty_internal_templatebase' => true,

        'smarty_internal_resource_file' => true,

        'smarty_internal_resource_extends' => true,

        'smarty_internal_resource_eval' => true,

        'smarty_internal_resource_string' => true,

        'smarty_internal_resource_registered' => true,

        'smarty_internal_extension_codeframe' => true,

        'smarty_internal_extension_config' => true,

        'smarty_internal_filter_handler' => true,

        'smarty_internal_function_call_handler' => true,

        'smarty_internal_cacheresource_file' => true,

        'smarty_internal_write_file' => true,

    );

    /**

     * Registers Smarty_Autoloader backward compatible to older installations.

     *

     * @param bool $prepend Whether to prepend the autoloader or not.

     */

    public static function registerBC($prepend = false) {

        /**

         * register the class autoloader

         */

        if (!defined('SMARTY_SPL_AUTOLOAD')) {

            define('SMARTY_SPL_AUTOLOAD', 0);

        }

        if (SMARTY_SPL_AUTOLOAD && set_include_path(get_include_path() . PATH_SEPARATOR . SMARTY_SYSPLUGINS_DIR) !== false) {

            $registeredAutoLoadFunctions = spl_autoload_functions();

            if (!isset($registeredAutoLoadFunctions['spl_autoload'])) {

                spl_autoload_register();

            }

        } else {

            self::register($prepend);

        }

    }

    /**

     * Registers Smarty_Autoloader as an SPL autoloader.

     *

     * @param bool $prepend Whether to prepend the autoloader or not.

     */

    public static function register($prepend = false) {

        self::$SMARTY_DIR = defined('SMARTY_DIR') ? SMARTY_DIR : dirname(__FILE__) . '/';

        self::$SMARTY_SYSPLUGINS_DIR = defined('SMARTY_SYSPLUGINS_DIR') ? SMARTY_SYSPLUGINS_DIR : self::$SMARTY_DIR . 'sysplugins/';

        if (version_compare(phpversion(), '5.3.0', '>=')) {

            spl_autoload_register(array(__CLASS__, 'autoload'), true, $prepend);

        } else {

            spl_autoload_register(array(__CLASS__, 'autoload'));

        }

    }

    /**

     * Handles autoloading of classes.

     *

     * @param string $class A class name.

     */

    public static function autoload($class) {

        // Request for Smarty or already unknown class

        if (isset(self::$unknown[$class])) {

            return;

        }

        $_class = strtolower($class);

        if (isset(self::$syspluginsClasses[$_class])) {

            $_class = (self::$syspluginsClasses[$_class] === true) ? $_class : self::$syspluginsClasses[$_class];

            $file = self::$SMARTY_SYSPLUGINS_DIR . $_class . '.php';

            require_once $file;

            return;

        } elseif (0 !== strpos($_class, 'smarty_internal_')) {

            if (isset(self::$rootClasses[$class])) {

                $file = self::$SMARTY_DIR . self::$rootClasses[$class];

                require_once $file;

                return;

            }

            self::$unknown[$class] = true;

            return;

        }

        $file = self::$SMARTY_SYSPLUGINS_DIR . $_class . '.php';

        if (is_file($file)) {

            require_once $file;

            return;

        }

        self::$unknown[$class] = true;

        return;

    }

}