<?php

namespace Assetic\Extension\Twig;

use Assetic\Asset\AssetInterface;
use Assetic\Factory\AssetFactory;

class AsseticTokenParser extends \Twig_TokenParser
{
	private $factory;
	private $tag;
	private $output;
	private $single;
	private $extensions;


	/**
	 * Constructor.
	 *
	 * Attributes can be added to the tag by passing names as the options
	 * array. These values, if found, will be passed to the factory and node.
	 *
	 * @param AssetFactory $factory    The asset factory
	 * @param string       $tag        The tag name
	 * @param string       $output     The default output string
	 * @param Boolean      $single     Whether to force a single asset
	 * @param array        $extensions Additional attribute names to look for
	 */
	public function __construct(AssetFactory $factory, $tag, $output, $single = false, array $extensions = array())
	{
		$this->factory    = $factory;
		$this->tag        = $tag;
		$this->output     = $output;
		$this->single     = $single;
		$this->extensions = $extensions;
	}


	public function parse(\Twig_Token $token)
	{
		$inputs = array();
		$filters = array();
		$name = null;
		$attributes = array(
		    'output'   => $this->output,
		    'var_name' => 'asset_url',
		);

		$stream = $this->parser->getStream();
		while (!$stream->test(\Twig_Token::BLOCK_END_TYPE)) {
		    if ($stream->test(\Twig_Token::STRING_TYPE)) {
		        // '@jquery', 'js/src/core/*', 'js/src/extra.js'
		        $inputs[] = $stream->next()->getValue();
		    } elseif ($stream->test(\Twig_Token::NAME_TYPE, 'filter')) {
		        // filter='yui_js'
		        $stream->next();
		        $stream->expect(\Twig_Token::OPERATOR_TYPE, '=');
		        $filters = array_merge($filters, array_filter(array_map('trim', explode(',', $stream->expect(\Twig_Token::STRING_TYPE)->getValue()))));
		    } elseif ($stream->test(\Twig_Token::NAME_TYPE, 'output')) {
		        // output='js/packed/*.js' OR output='js/core.js'
		        $stream->next();
		        $stream->expect(\Twig_Token::OPERATOR_TYPE, '=');
		        $attributes['output'] = $stream->expect(\Twig_Token::STRING_TYPE)->getValue();
		    } elseif ($stream->test(\Twig_Token::NAME_TYPE, 'name')) {
		        // name='core_js'
		        $stream->next();
		        $stream->expect(\Twig_Token::OPERATOR_TYPE, '=');
		        $name = $stream->expect(\Twig_Token::STRING_TYPE)->getValue();
		    } elseif ($stream->test(\Twig_Token::NAME_TYPE, 'as')) {
		        // as='the_url'
		        $stream->next();
		        $stream->expect(\Twig_Token::OPERATOR_TYPE, '=');
		        $attributes['var_name'] = $stream->expect(\Twig_Token::STRING_TYPE)->getValue();
		    } elseif ($stream->test(\Twig_Token::NAME_TYPE, 'debug')) {
		        // debug=true
		        $stream->next();
		        $stream->expect(\Twig_Token::OPERATOR_TYPE, '=');
		        $attributes['debug'] = 'true' == $stream->expect(\Twig_Token::NAME_TYPE, array('true', 'false'))->getValue();
		    } elseif ($stream->test(\Twig_Token::NAME_TYPE, 'combine')) {
		        // combine=true
		        $stream->next();
		        $stream->expect(\Twig_Token::OPERATOR_TYPE, '=');
		        $attributes['combine'] = 'true' == $stream->expect(\Twig_Token::NAME_TYPE, array('true', 'false'))->getValue();
		    } elseif ($stream->test(\Twig_Token::NAME_TYPE, $this->extensions)) {
		        // an arbitrary configured attribute
		        $key = $stream->next()->getValue();
		        $stream->expect(\Twig_Token::OPERATOR_TYPE, '=');
		        $attributes[$key] = $stream->expect(\Twig_Token::STRING_TYPE)->getValue();
		    } else {
		        $token = $stream->getCurrent();
		        throw new \Twig_Error_Syntax(sprintf('Unexpected token "%s" of value "%s"', \Twig_Token::typeToEnglish($token->getType(), $token->getLine()), $token->getValue()), $token->getLine());
		    }
		}

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

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

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

		if ($this->single && 1 < count($inputs)) {
		    $inputs = array_slice($inputs, -1);
		}

		if (!$name) {
		    $name = $this->factory->generateAssetName($inputs, $filters, $attributes);
		}

		$asset = $this->factory->createAsset($inputs, $filters, $attributes + array('name' => $name));

		return $this->createNode($asset, $body, $inputs, $filters, $name, $attributes, $token->getLine(), $this->getTag());
	}


	public function getTag()
	{
		return $this->tag;
	}


	public function testEndTag(\Twig_Token $token)
	{
		return $token->test(array('end'.$this->getTag()));
	}


	protected function createNode(
		AssetInterface $asset,
		\Twig_NodeInterface $body,
		array $inputs,
		array $filters,
		$name,
		array $attributes = array(),
		$lineno = 0,
		$tag = null,
	) {
		return new AsseticNode($asset, $body, $inputs, $filters, $name, $attributes, $lineno, $tag);
	}
}
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