--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/symfony/src/Symfony/Component/DependencyInjection/Compiler/ReplaceAliasByActualDefinitionPass.php	Sat Sep 24 15:40:41 2011 +0200
@@ -0,0 +1,116 @@
+<?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\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
+
+/**
+ * Replaces aliases with actual service definitions, effectively removing these
+ * aliases.
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class ReplaceAliasByActualDefinitionPass implements CompilerPassInterface
+{
+    private $compiler;
+    private $formatter;
+    private $sourceId;
+
+    /**
+     * Process the Container to replace aliases with service definitions.
+     *
+     * @param ContainerBuilder $container
+     */
+    public function process(ContainerBuilder $container)
+    {
+        $this->compiler = $container->getCompiler();
+        $this->formatter = $this->compiler->getLoggingFormatter();
+
+        foreach ($container->getAliases() as $id => $alias) {
+            $aliasId = (string) $alias;
+
+            $definition = $container->getDefinition($aliasId);
+
+            if ($definition->isPublic()) {
+                continue;
+            }
+
+            $definition->setPublic(true);
+            $container->setDefinition($id, $definition);
+            $container->removeDefinition($aliasId);
+
+            $this->updateReferences($container, $aliasId, $id);
+
+            // we have to restart the process due to concurrent modification of
+            // the container
+            $this->process($container);
+
+            break;
+        }
+    }
+
+    /**
+     * Updates references to remove aliases.
+     *
+     * @param ContainerBuilder $container The container
+     * @param string $currentId The alias identifier being replaced
+     * @param string $newId The id of the service the alias points to
+     */
+    private function updateReferences($container, $currentId, $newId)
+    {
+        foreach ($container->getAliases() as $id => $alias) {
+            if ($currentId === (string) $alias) {
+                $container->setAlias($id, $newId);
+            }
+        }
+
+        foreach ($container->getDefinitions() as $id => $definition) {
+            $this->sourceId = $id;
+
+            $definition->setArguments(
+                $this->updateArgumentReferences($definition->getArguments(), $currentId, $newId)
+            );
+
+            $definition->setMethodCalls(
+                $this->updateArgumentReferences($definition->getMethodCalls(), $currentId, $newId)
+            );
+
+            $definition->setProperties(
+                $this->updateArgumentReferences($definition->getProperties(), $currentId, $newId)
+            );
+        }
+    }
+
+    /**
+     * Updates argument references.
+     *
+     * @param array $arguments An array of Arguments
+     * @param string $currentId The alias identifier
+     * @param string $newId The identifier the alias points to
+     */
+    private function updateArgumentReferences(array $arguments, $currentId, $newId)
+    {
+        foreach ($arguments as $k => $argument) {
+            if (is_array($argument)) {
+                $arguments[$k] = $this->updateArgumentReferences($argument, $currentId, $newId);
+            } else if ($argument instanceof Reference) {
+                if ($currentId === (string) $argument) {
+                    $arguments[$k] = new Reference($newId, $argument->getInvalidBehavior());
+                    $this->compiler->addLogMessage($this->formatter->formatUpdateReference($this, $this->sourceId, $currentId, $newId));
+                }
+            }
+        }
+
+        return $arguments;
+    }
+}