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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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/**
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 * Interface implemented by lexer classes.
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 *
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 * @package    twig
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 * @author     Fabien Potencier <fabien@symfony.com>
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 */
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interface Twig_LexerInterface
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{
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    /**
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     * Tokenizes a source code.
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     *
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     * @param  string $code     The source code
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     * @param  string $filename A unique identifier for the source code
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     *
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     * @return Twig_TokenStream A token stream instance
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     */
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    function tokenize($code, $filename = null);
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}
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