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<?php

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

namespace Symfony\Bundle\TwigBundle\CacheWarmer;

use Psr\Container\ContainerInterface;
use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerInterface;
use Symfony\Contracts\Service\ServiceSubscriberInterface;
use Twig\Environment;
use Twig\Error\Error;

/**
 * Generates the Twig cache for all templates.
 *
 * @author Fabien Potencier <[email protected]>
 */
class TemplateCacheWarmer implements CacheWarmerInterface, ServiceSubscriberInterface
{
    private $container;
    private $twig;
    private $iterator;

    public function __construct(ContainerInterface $container, iterable $iterator)
    {
        // As this cache warmer is optional, dependencies should be lazy-loaded, that's why a container should be injected.
        $this->container = $container;
        $this->iterator = $iterator;
    }

    /**
     * {@inheritdoc}
     *
     * @return string[] A list of template files to preload on PHP 7.4+
     */
    public function warmUp(string $cacheDir)
    {
        if (null === $this->twig) {
            $this->twig = $this->container->get('twig');
        }

        $files = [];

        foreach ($this->iterator as $template) {
            try {
                $template = $this->twig->load($template);

                if (\is_callable([$template, 'unwrap'])) {
                    $files[] = (new \ReflectionClass($template->unwrap()))->getFileName();
                }
            } catch (Error $e) {
                /*
                 * Problem during compilation, give up for this template (e.g. syntax errors).
                 * Failing silently here allows to ignore templates that rely on functions that aren't available in
                 * the current environment. For example, the WebProfilerBundle shouldn't be available in the prod
                 * environment, but some templates that are never used in prod might rely on functions the bundle provides.
                 * As we can't detect which templates are "really" important, we try to load all of them and ignore
                 * errors. Error checks may be performed by calling the lint:twig command.
                 */
            }
        }

        return $files;
    }

    /**
     * {@inheritdoc}
     */
    public function isOptional()
    {
        return true;
    }

    /**
     * {@inheritdoc}
     */
    public static function getSubscribedServices()
    {
        return [
            'twig' => Environment::class,
        ];
    }
}