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vendor/symfony/dependency-injection/Compiler/ResolveReferencesToAliasesPass.php

@@ -0,0 +1,77 @@
+<?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\Exception\ServiceCircularReferenceException;
+use Symfony\Component\DependencyInjection\Reference;
+
+/**
+ * Replaces all references to aliases with references to the actual service.
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class ResolveReferencesToAliasesPass extends AbstractRecursivePass
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function process(ContainerBuilder $container)
+    {
+        parent::process($container);
+
+        foreach ($container->getAliases() as $id => $alias) {
+            $aliasId = $container->normalizeId($alias);
+            if ($aliasId !== $defId = $this->getDefinitionId($aliasId, $container)) {
+                $container->setAlias($id, $defId)->setPublic($alias->isPublic())->setPrivate($alias->isPrivate());
+            }
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function processValue($value, $isRoot = false)
+    {
+        if ($value instanceof Reference) {
+            $defId = $this->getDefinitionId($id = $this->container->normalizeId($value), $this->container);
+
+            if ($defId !== $id) {
+                return new Reference($defId, $value->getInvalidBehavior());
+            }
+        }
+
+        return parent::processValue($value);
+    }
+
+    /**
+     * Resolves an alias into a definition id.
+     *
+     * @param string           $id        The definition or alias id to resolve
+     * @param ContainerBuilder $container
+     *
+     * @return string The definition id with aliases resolved
+     */
+    private function getDefinitionId($id, ContainerBuilder $container)
+    {
+        $seen = array();
+        while ($container->hasAlias($id)) {
+            if (isset($seen[$id])) {
+                throw new ServiceCircularReferenceException($id, array_merge(array_keys($seen), array($id)));
+            }
+            $seen[$id] = true;
+            $id = $container->normalizeId($container->getAlias($id));
+        }
+
+        return $id;
+    }
+}