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Edit File: StopwatchTokenParser.php

<?php

namespace Barryvdh\Debugbar\Twig\TokenParser;

use Barryvdh\Debugbar\Twig\Node\StopwatchNode;

/**
 * Token Parser for the stopwatch tag. Based on Symfony\Bridge\Twig\TokenParser\StopwatchTokenParser;
 *
 * @author Wouter J <wouter@wouterj.nl>
 */
class StopwatchTokenParser extends \Twig_TokenParser
{
    protected $debugbarAvailable;

public function __construct($debugbarAvailable)
    {
        $this->debugbarAvailable = $debugbarAvailable;
    }

public function parse(\Twig_Token $token)
    {
        $lineno = $token->getLine();
        $stream = $this->parser->getStream();

// {% stopwatch 'bar' %}
        $name = $this->parser->getExpressionParser()->parseExpression();

$stream->expect(\Twig_Token::BLOCK_END_TYPE);

// {% endstopwatch %}
        $body = $this->parser->subparse([$this, 'decideStopwatchEnd'], true);
        $stream->expect(\Twig_Token::BLOCK_END_TYPE);

if ($this->debugbarAvailable) {
            return new StopwatchNode(
                $name,
                $body,
                new \Twig_Node_Expression_AssignName($this->parser->getVarName(), $token->getLine()),
                $lineno,
                $this->getTag()
            );
        }

return $body;
    }

public function getTag()
    {
        return 'stopwatch';
    }

public function decideStopwatchEnd(\Twig_Token $token)
    {
        return $token->test('endstopwatch');
    }
}

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