function RegisterEventSubscribersPass::process

File

core/lib/Drupal/Core/DependencyInjection/Compiler/RegisterEventSubscribersPass.php, line 17

Class

RegisterEventSubscribersPass

Registers all event subscribers to the event dispatcher.

Namespace

Code

public function process(ContainerBuilder $container) {
    if (!$container->hasDefinition('event_dispatcher')) {
        return;
    }
    $definition = $container->getDefinition('event_dispatcher');
    $event_subscriber_info = [];
    foreach ($container->findTaggedServiceIds('event_subscriber') as $id => $attributes) {
        // We must assume that the class value has been correctly filled, even if
        // the service is created by a factory.
        $class = $container->getDefinition($id)
            ->getClass();
        $interface = EventSubscriberInterface::class;
        if (!is_subclass_of($class, $interface)) {
            throw new \InvalidArgumentException(sprintf('Service "%s" must implement interface "%s".', $id, $interface));
        }
        // Get all subscribed events.
        foreach ($class::getSubscribedEvents() as $event_name => $params) {
            if (is_string($params)) {
                $priority = 0;
                $event_subscriber_info[$event_name][$priority][] = [
                    'service' => [
                        $id,
                        $params,
                    ],
                ];
            }
            elseif (is_string($params[0])) {
                $priority = $params[1] ?? 0;
                $event_subscriber_info[$event_name][$priority][] = [
                    'service' => [
                        $id,
                        $params[0],
                    ],
                ];
            }
            else {
                foreach ($params as $listener) {
                    $priority = $listener[1] ?? 0;
                    $event_subscriber_info[$event_name][$priority][] = [
                        'service' => [
                            $id,
                            $listener[0],
                        ],
                    ];
                }
            }
        }
    }
    foreach (array_keys($event_subscriber_info) as $event_name) {
        krsort($event_subscriber_info[$event_name]);
    }
    $definition->addArgument($event_subscriber_info);
}