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vendor/symfony/twig-bundle/CacheWarmer/TemplateCacheWarmer.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\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 <fabien@symfony.com>
+ */
+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,
+        ];
+    }
+}