<?php

/*

 * This file is part of Twig.

 *

 * (c) 2009 Fabien Potencier

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */

abstract class Twig_Extension implements Twig_ExtensionInterface

{

    /**

     * Initializes the runtime environment.

     *

     * This is where you can load some file that contains filter functions for instance.

     *

     * @param Twig_Environment $environment The current Twig_Environment instance

     */

    public function initRuntime(Twig_Environment $environment)

    {

    }

    /**

     * Returns the token parser instances to add to the existing list.

     *

     * @return array An array of Twig_TokenParserInterface or Twig_TokenParserBrokerInterface instances

     */

    public function getTokenParsers()

    {

        return array();

    }

    /**

     * Returns the node visitor instances to add to the existing list.

     *

     * @return array An array of Twig_NodeVisitorInterface instances

     */

    public function getNodeVisitors()

    {

        return array();

    }

    /**

     * Returns a list of filters to add to the existing list.

     *

     * @return array An array of filters

     */

    public function getFilters()

    {

        return array();

    }

    /**

     * Returns a list of tests to add to the existing list.

     *

     * @return array An array of tests

     */

    public function getTests()

    {

        return array();

    }

    /**

     * Returns a list of functions to add to the existing list.

     *

     * @return array An array of functions

     */

    public function getFunctions()

    {

        return array();

    }

    /**

     * Returns a list of operators to add to the existing list.

     *

     * @return array An array of operators

     */

    public function getOperators()

    {

        return array();

    }

    /**

     * Returns a list of global functions to add to the existing list.

     *

     * @return array An array of global functions

     */

    public function getGlobals()

    {

        return array();

    }

}