Actualización

vendor/symfony/twig-bundle/DependencyInjection/Compiler/TwigLoaderPass.php

@@ -0,0 +1,60 @@
+<?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\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\Exception\LogicException;
+
+/**
+ * Adds services tagged twig.loader as Twig loaders.
+ *
+ * @author Daniel Leech <daniel@dantleech.com>
+ */
+class TwigLoaderPass implements CompilerPassInterface
+{
+    public function process(ContainerBuilder $container)
+    {
+        if (false === $container->hasDefinition('twig')) {
+            return;
+        }
+
+        $prioritizedLoaders = array();
+        $found = 0;
+
+        foreach ($container->findTaggedServiceIds('twig.loader') as $id => $attributes) {
+            $priority = isset($attributes[0]['priority']) ? $attributes[0]['priority'] : 0;
+            $prioritizedLoaders[$priority][] = $id;
+            ++$found;
+        }
+
+        if (!$found) {
+            throw new LogicException('No twig loaders found. You need to tag at least one loader with "twig.loader"');
+        }
+
+        if (1 === $found) {
+            $container->setAlias('twig.loader', $id);
+        } else {
+            $chainLoader = $container->getDefinition('twig.loader.chain');
+            krsort($prioritizedLoaders);
+
+            foreach ($prioritizedLoaders as $loaders) {
+                foreach ($loaders as $loader) {
+                    $chainLoader->addMethodCall('addLoader', array(new Reference($loader)));
+                }
+            }
+
+            $container->setAlias('twig.loader', 'twig.loader.chain');
+        }
+    }
+}