Actualización

vendor/symfony/twig-bundle/CacheWarmer/TemplateCacheWarmer.php

@@ -0,0 +1,76 @@
+<?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 Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerInterface;
+use Twig\Environment;
+use Twig\Error\Error;
+
+/**
+ * Generates the Twig cache for all templates.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class TemplateCacheWarmer implements CacheWarmerInterface
+{
+    private $container;
+    private $twig;
+    private $iterator;
+
+    /**
+     * TemplateCacheWarmer constructor.
+     *
+     * @param ContainerInterface|Environment $container
+     * @param \Traversable                   $iterator
+     */
+    public function __construct($container, \Traversable $iterator)
+    {
+        // As this cache warmer is optional, dependencies should be lazy-loaded, that's why a container should be injected.
+        if ($container instanceof ContainerInterface) {
+            $this->container = $container;
+        } elseif ($container instanceof Environment) {
+            $this->twig = $container;
+        } else {
+            throw new \InvalidArgumentException(sprintf('%s only accepts instance of Symfony\Component\DependencyInjection\ContainerInterface or Environment as first argument.', __CLASS__));
+        }
+
+        $this->iterator = $iterator;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function warmUp($cacheDir)
+    {
+        if (null === $this->twig) {
+            $this->twig = $this->container->get('twig');
+        }
+
+        foreach ($this->iterator as $template) {
+            try {
+                $this->twig->loadTemplate($template);
+            } catch (Error $e) {
+                // problem during compilation, give up
+                // might be a syntax error or a non-Twig template
+            }
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isOptional()
+    {
+        return true;
+    }
+}