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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\EventDispatcher\DependencyInjection;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;
/**
* Compiler pass to register tagged services for an event dispatcher.
*/
class RegisterListenersPass implements CompilerPassInterface
{
protected $dispatcherService;
protected $listenerTag;
protected $subscriberTag;
/**
* @param string $dispatcherService Service name of the event dispatcher in processed container
* @param string $listenerTag Tag name used for listener
* @param string $subscriberTag Tag name used for subscribers
*/
public function __construct($dispatcherService = 'event_dispatcher', $listenerTag = 'kernel.event_listener', $subscriberTag = 'kernel.event_subscriber')
{
$this->dispatcherService = $dispatcherService;
$this->listenerTag = $listenerTag;
$this->subscriberTag = $subscriberTag;
}
public function process(ContainerBuilder $container)
{
if (!$container->hasDefinition($this->dispatcherService) && !$container->hasAlias($this->dispatcherService)) {
return;
}
$definition = $container->findDefinition($this->dispatcherService);
foreach ($container->findTaggedServiceIds($this->listenerTag) as $id => $events) {
$def = $container->getDefinition($id);
if (!$def->isPublic()) {
throw new \InvalidArgumentException(sprintf('The service "%s" must be public as event listeners are lazy-loaded.', $id));
}
if ($def->isAbstract()) {
throw new \InvalidArgumentException(sprintf('The service "%s" must not be abstract as event listeners are lazy-loaded.', $id));
}
foreach ($events as $event) {
$priority = isset($event['priority']) ? $event['priority'] : 0;
if (!isset($event['event'])) {
throw new \InvalidArgumentException(sprintf('Service "%s" must define the "event" attribute on "%s" tags.', $id, $this->listenerTag));
}
if (!isset($event['method'])) {
$event['method'] = 'on'.preg_replace_callback(array(
'/(?<=\b)[a-z]/i',
'/[^a-z0-9]/i',
), function ($matches) { return strtoupper($matches[0]); }, $event['event']);
$event['method'] = preg_replace('/[^a-z0-9]/i', '', $event['method']);
}
$definition->addMethodCall('addListenerService', array($event['event'], array($id, $event['method']), $priority));
}
}
foreach ($container->findTaggedServiceIds($this->subscriberTag) as $id => $attributes) {
$def = $container->getDefinition($id);
if (!$def->isPublic()) {
throw new \InvalidArgumentException(sprintf('The service "%s" must be public as event subscribers are lazy-loaded.', $id));
}
if ($def->isAbstract()) {
throw new \InvalidArgumentException(sprintf('The service "%s" must not be abstract as event subscribers are lazy-loaded.', $id));
}
// We must assume that the class value has been correctly filled, even if the service is created by a factory
$class = $container->getParameterBag()->resolveValue($def->getClass());
$interface = 'Symfony\Component\EventDispatcher\EventSubscriberInterface';
if (!is_subclass_of($class, $interface)) {
if (!class_exists($class, false)) {
throw new \InvalidArgumentException(sprintf('Class "%s" used for service "%s" cannot be found.', $class, $id));
}
throw new \InvalidArgumentException(sprintf('Service "%s" must implement interface "%s".', $id, $interface));
}
$definition->addMethodCall('addSubscriberService', array($id, $class));
}
}
}
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