vendor/kriswallsmith/assetic/src/Assetic/Extension/Twig/TwigFormulaLoader.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\Extension\Twig;

use Assetic\Factory\Loader\FormulaLoaderInterface;
use Assetic\Factory\Resource\ResourceInterface;
use Psr\Log\LoggerInterface;

/**
 * Loads asset formulae from Twig templates.
 *
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 */
class TwigFormulaLoader implements FormulaLoaderInterface
{
    private $twig;
    private $logger;

    public function __construct(\Twig_Environment $twig, LoggerInterface $logger = null)
    {
        $this->twig = $twig;
        $this->logger = $logger;
    }

    public function load(ResourceInterface $resource)
    {
        try {
            $tokens = $this->twig->tokenize(new \Twig_Source($resource->getContent(), (string) $resource));
            $nodes  = $this->twig->parse($tokens);
        } catch (\Exception $e) {
            if ($this->logger) {
                $this->logger->error(sprintf('The template "%s" contains an error: %s', $resource, $e->getMessage()));
            }

            return array();
        }

        return $this->loadNode($nodes);
    }

    /**
     * Loads assets from the supplied node.
     *
     * @param \Twig_Node $node
     *
     * @return array An array of asset formulae indexed by name
     */
    private function loadNode(\Twig_Node $node)
    {
        $formulae = array();