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vendor/symfony/http-kernel/DependencyInjection/LazyLoadingFragmentHandler.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\Component\HttpKernel\DependencyInjection;
+
+use Psr\Container\ContainerInterface;
+use Symfony\Component\HttpFoundation\RequestStack;
+use Symfony\Component\HttpKernel\Controller\ControllerReference;
+use Symfony\Component\HttpKernel\Fragment\FragmentHandler;
+
+/**
+ * Lazily loads fragment renderers from the dependency injection container.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class LazyLoadingFragmentHandler extends FragmentHandler
+{
+    private ContainerInterface $container;
+
+    /**
+     * @var array<string, bool>
+     */
+    private array $initialized = [];
+
+    public function __construct(ContainerInterface $container, RequestStack $requestStack, bool $debug = false)
+    {
+        $this->container = $container;
+
+        parent::__construct($requestStack, [], $debug);
+    }
+
+    public function render(string|ControllerReference $uri, string $renderer = 'inline', array $options = []): ?string
+    {
+        if (!isset($this->initialized[$renderer]) && $this->container->has($renderer)) {
+            $this->addRenderer($this->container->get($renderer));
+            $this->initialized[$renderer] = true;
+        }
+
+        return parent::render($uri, $renderer, $options);
+    }
+}