vendor/kriswallsmith/assetic/src/Assetic/Factory/Loader/BasePhpFormulaLoader.php

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<?php

/*
 * This file is part of the Assetic package, an OpenSky project.
 *
 * (c) 2010-2014 OpenSky Project Inc
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Assetic\Factory\Loader;

use Assetic\Factory\AssetFactory;
use Assetic\Factory\Resource\ResourceInterface;
use Assetic\Util\FilesystemUtils;

/**
 * Loads asset formulae from PHP files.
 *
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 */
abstract class BasePhpFormulaLoader implements FormulaLoaderInterface
{
    protected $factory;
    protected $prototypes;

    public function __construct(AssetFactory $factory)
    {
        $this->factory = $factory;
        $this->prototypes = array();

        foreach ($this->registerPrototypes() as $prototype => $options) {
            $this->addPrototype($prototype, $options);
        }
    }

    public function addPrototype($prototype, array $options = array())
    {
        $tokens = token_get_all('<?php '.$prototype);
        array_shift($tokens);

        $this->prototypes[$prototype] = array($tokens, $options);
    }

    public function load(ResourceInterface $resource)
    {
        if (!$nbProtos = count($this->prototypes)) {
            throw new \LogicException('There are no prototypes registered.');
        }

        $buffers = array_fill(0, $nbProtos, '');
        $bufferLevels = array_fill(0, $nbProtos, 0);
        $buffersInWildcard = array();

        $tokens = token_get_all($resource->getContent());
        $calls = array();

        while ($token = array_shift($tokens)) {
            $current = self::tokenToString($token);