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vendor/symfony/http-kernel/Controller/ArgumentResolver/RequestAttributeValueResolver.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\Controller\ArgumentResolver;
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Controller\ArgumentValueResolverInterface;
+use Symfony\Component\HttpKernel\ControllerMetadata\ArgumentMetadata;
+
+/**
+ * Yields a non-variadic argument's value from the request attributes.
+ *
+ * @author Iltar van der Berg <kjarli@gmail.com>
+ */
+final class RequestAttributeValueResolver implements ArgumentValueResolverInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function supports(Request $request, ArgumentMetadata $argument): bool
+    {
+        return !$argument->isVariadic() && $request->attributes->has($argument->getName());
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function resolve(Request $request, ArgumentMetadata $argument): iterable
+    {
+        yield $request->attributes->get($argument->getName());
+    }
+}