<?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.

 */

/**

 * Marks a section of a template to be escaped or not.

 *

 * <pre>

 * {% autoescape true %}

 *   Everything will be automatically escaped in this block

 * {% endautoescape %}

 *

 * {% autoescape false %}

 *   Everything will be outputed as is in this block

 * {% endautoescape %}

 *

 * {% autoescape true js %}

 *   Everything will be automatically escaped in this block

 *   using the js escaping strategy

 * {% endautoescape %}

 * </pre>

 */

class Twig_TokenParser_AutoEscape extends Twig_TokenParser

{

    /**

     * Parses a token and returns a node.

     *

     * @param Twig_Token $token A Twig_Token instance

     *

     * @return Twig_NodeInterface A Twig_NodeInterface instance

     */

    public function parse(Twig_Token $token)

    {

        $lineno = $token->getLine();

        $value = $this->parser->getStream()->expect(Twig_Token::NAME_TYPE)->getValue();

        if (!in_array($value, array('true', 'false'))) {

            throw new Twig_Error_Syntax("Autoescape value must be 'true' or 'false'", $lineno);

        }

        $value = 'true' === $value ? 'html' : false;

        if ($this->parser->getStream()->test(Twig_Token::NAME_TYPE)) {

            if (false === $value) {

                throw new Twig_Error_Syntax('Unexpected escaping strategy as you set autoescaping to false.', $lineno);

            }

            $value = $this->parser->getStream()->next()->getValue();

        }

        $this->parser->getStream()->expect(Twig_Token::BLOCK_END_TYPE);

        $body = $this->parser->subparse(array($this, 'decideBlockEnd'), true);

        $this->parser->getStream()->expect(Twig_Token::BLOCK_END_TYPE);

        return new Twig_Node_AutoEscape($value, $body, $lineno, $this->getTag());

    }

    public function decideBlockEnd(Twig_Token $token)

    {

        return $token->test('endautoescape');

    }

    /**

     * Gets the tag name associated with this token parser.

     *

     * @param string The tag name

     */

    public function getTag()

    {

        return 'autoescape';

    }

}