vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Routing/DelegatingLoader.php

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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Bundle\FrameworkBundle\Routing;

use Symfony\Bundle\FrameworkBundle\Controller\ControllerNameParser;
use Symfony\Component\Config\Exception\FileLoaderLoadException;
use Symfony\Component\Config\Loader\DelegatingLoader as BaseDelegatingLoader;
use Symfony\Component\Config\Loader\LoaderResolverInterface;
use Psr\Log\LoggerInterface;

/**
 * DelegatingLoader delegates route loading to other loaders using a loader resolver.
 *
 * This implementation resolves the _controller attribute from the short notation
 * to the fully-qualified form (from a:b:c to class::method).
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class DelegatingLoader extends BaseDelegatingLoader
{
    protected $parser;
    protected $logger;
    private $loading = false;

    /**
     * Constructor.
     *
     * Ability to pass a LoggerInterface instance as second argument will be removed in 3.0.
     *
     * @param ControllerNameParser    $parser   A ControllerNameParser instance
     * @param LoaderResolverInterface $resolver A LoaderResolverInterface instance
     */
    public function __construct(ControllerNameParser $parser, $resolver, $r = null)
    {
        $this->parser = $parser;

        if (!$resolver instanceof LoaderResolverInterface) {
            $this->logger = $resolver;
            $resolver = $r;

            @trigger_error('Passing a LoggerInterface instance as the second argument of the '.__METHOD__.' method is deprecated since version 2.8 and will not be supported anymore in 3.0.', E_USER_DEPRECATED);
        }

        parent::__construct($resolver);
    }

    /**
     * {@inheritdoc}
     */
    public function load($resource, $type = null)
    {