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<?php
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/*
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 * This file is part of Twig.
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 *
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 * (c) 2009 Fabien Potencier
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 *
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 * For the full copyright and license information, please view the LICENSE
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 * file that was distributed with this source code.
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 */
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abstract class Twig_Extension implements Twig_ExtensionInterface
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{
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    /**
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     * Initializes the runtime environment.
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     *
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     * This is where you can load some file that contains filter functions for instance.
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     *
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     * @param Twig_Environment $environment The current Twig_Environment instance
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     */
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    public function initRuntime(Twig_Environment $environment)
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    {
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    }
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    /**
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     * Returns the token parser instances to add to the existing list.
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     *
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     * @return array An array of Twig_TokenParserInterface or Twig_TokenParserBrokerInterface instances
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     */
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    public function getTokenParsers()
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    {
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        return array();
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    }
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    /**
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     * Returns the node visitor instances to add to the existing list.
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     *
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     * @return array An array of Twig_NodeVisitorInterface instances
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     */
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    public function getNodeVisitors()
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    {
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        return array();
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    }
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    /**
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     * Returns a list of filters to add to the existing list.
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     *
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     * @return array An array of filters
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     */
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    public function getFilters()
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    {
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        return array();
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    }
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    /**
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     * Returns a list of tests to add to the existing list.
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     *
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     * @return array An array of tests
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     */
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    public function getTests()
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    {
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        return array();
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    }
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    /**
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     * Returns a list of functions to add to the existing list.
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     *
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     * @return array An array of functions
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     */
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    public function getFunctions()
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    {
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        return array();
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    }
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    /**
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     * Returns a list of operators to add to the existing list.
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     *
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     * @return array An array of operators
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     */
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    public function getOperators()
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    {
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        return array();
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    }
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    /**
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     * Returns a list of global variables to add to the existing list.
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     *
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     * @return array An array of global variables
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     */
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    public function getGlobals()
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    {
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        return array();
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    }
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}
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