Support PHP 8's attributes for my routes in custom Symfony framework - symfony

Question

I've followed the Symfony Tutorial Series to create my own Symfony framework. Currently I have the following code to define my routes and add them to the UrlMatcher:
$request = Request::createFromGlobals();
$routes = include __DIR__.'/../src/app.php';
$context = new Routing\RequestContext();
$matcher = new Routing\Matcher\UrlMatcher($routes, $context);
Here's my app.php file for reference:
<?php
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing;
$routes = new Routing\RouteCollection();
$routes->add('leap_year', new Routing\Route('/is_leap_year/{year}', [
'year' => null,
'_controller' => 'App\Controller\LeapYearController::index',
]));
return $routes;
What's the simplest way this can be modified to support PHP 8's attributes against the LeapYearController's actions for my routes instead of defining them in the app.php file?
It's been a while since I last looked at Symfony and a lot has changed in the framework aswell as in PHP itself and so far everything I have found is no longer supported.

Answer 1

I've managed to get the following working:
$loader = new AnnotationDirectoryLoader(
new FileLocator(),
new class() extends AnnotationClassLoader {
protected function configureRoute(Route $route, \ReflectionClass $class, \ReflectionMethod $method, object $annot) {
$route->setDefault('_controller', $class->getName() . '::' . $method->getName());
}
}
);
$routes = $loader->load(__DIR__ . '/../src/App/Controller');
Alternatively this works using the Psr4DirectoryLoader introduced in version 6.2:
$loader = new DelegatingLoader(
new LoaderResolver([
new Psr4DirectoryLoader(
new FileLocator()
),
new class() extends AnnotationClassLoader {
protected function configureRoute(Route $route, \ReflectionClass $class, \ReflectionMethod $method, object $annot) {
$route->setDefault('_controller', $class->getName() . '::' . $method->getName());
}
}
])
);
$routes = $loader->load(['path' => __DIR__ . '/../src/App/Controller', 'namespace' => 'App\Controller'], 'attribute');