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vendor/symfony/swiftmailer-bundle/DependencyInjection/Compiler/RegisterPluginsPass.php

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+<?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\SwiftmailerBundle\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
+
+/**
+ * RegisterPluginsPass registers Swiftmailer plugins.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class RegisterPluginsPass implements CompilerPassInterface
+{
+    public function process(ContainerBuilder $container)
+    {
+        if (!$container->findDefinition('swiftmailer.mailer') || !$container->getParameter('swiftmailer.mailers')) {
+            return;
+        }
+
+        $mailers = $container->getParameter('swiftmailer.mailers');
+        foreach ($mailers as $name => $mailer) {
+            $plugins = $this->findSortedByPriorityTaggedServiceIds($container, sprintf('swiftmailer.%s.plugin', $name));
+            $transport = sprintf('swiftmailer.mailer.%s.transport', $name);
+            $definition = $container->findDefinition($transport);
+            foreach ($plugins as $id => $args) {
+                $definition->addMethodCall('registerPlugin', array(new Reference($id)));
+            }
+        }
+    }
+
+    /**
+     * @return array
+     */
+    private function findSortedByPriorityTaggedServiceIds(ContainerBuilder $container, $tag)
+    {
+        $taggedServices = $container->findTaggedServiceIds($tag);
+        uasort(
+            $taggedServices,
+            function ($tagA, $tagB) {
+                $priorityTagA = isset($tagA[0]['priority']) ? $tagA[0]['priority'] : 0;
+                $priorityTagB = isset($tagB[0]['priority']) ? $tagB[0]['priority'] : 0;
+
+                return $priorityTagA - $priorityTagB;
+            }
+        );
+
+        return $taggedServices;
+    }
+}