--- /dev/null
+<?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\Component\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\Alias;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+
+/**
+ * Sets a service to be an alias of another one, given a format pattern.
+ */
+class AutoAliasServicePass implements CompilerPassInterface
+{
+ /**
+ * {@inheritdoc}
+ */
+ public function process(ContainerBuilder $container)
+ {
+ foreach ($container->findTaggedServiceIds('auto_alias') as $serviceId => $tags) {
+ foreach ($tags as $tag) {
+ if (!isset($tag['format'])) {
+ throw new InvalidArgumentException(sprintf('Missing tag information "format" on auto_alias service "%s".', $serviceId));
+ }
+
+ $aliasId = $container->getParameterBag()->resolveValue($tag['format']);
+ if ($container->hasDefinition($aliasId) || $container->hasAlias($aliasId)) {
+ $container->setAlias($serviceId, new Alias($aliasId));
+ }
+ }
+ }
+ }
+}