<?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\Argument\ServiceClosureArgument;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
use Symfony\Component\DependencyInjection\Reference;
use Symfony\Component\EventDispatcher\EventDispatcher;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
/**
* Compiler pass to register tagged services for an event dispatcher.
*/
class RegisterListenersPass implements CompilerPassInterface
{
protected $dispatcherService;
protected $listenerTag;
protected $subscriberTag;
private $hotPathEvents = [];
private $hotPathTagName;
/**
* @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 setHotPathEvents(array $hotPathEvents, $tagName = 'container.hot_path')
{
$this->hotPathEvents = array_flip($hotPathEvents);
$this->hotPathTagName = $tagName;
return $this;
}
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, true) as $id => $events) {
foreach ($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'])) {
$event['method'] = 'on'.preg_replace_callback([
'/(?<=\b)[a-z]/i',
'/[^a-z0-9]/i',
], function ($matches) { return strtoupper($matches[0]); }, $event['event']);
$event['method'] = preg_replace('/[^a-z0-9]/i', '', $event['method']);
}
$definition->addMethodCall('addListener', [$event['event'], [new ServiceClosureArgument(new Reference($id)), $event['method']], $priority]);
if (isset($this->hotPathEvents[$event['event']])) {
$container->getDefinition($id)->addTag($this->hotPathTagName);
}
}
}
$extractingDispatcher = new ExtractingEventDispatcher();
foreach ($container->findTaggedServiceIds($this->subscriberTag, true) as $id => $attributes) {
$def = $container->getDefinition($id);
// We must assume that the class value has been correctly filled, even if the service is created by a factory
$class = $def->getClass();
if (!$r = $container->getReflectionClass($class)) {
throw new InvalidArgumentException(sprintf('Class "%s" used for service "%s" cannot be found.', $class, $id));
}
if (!$r->isSubclassOf(EventSubscriberInterface::class)) {
throw new InvalidArgumentException(sprintf('Service "%s" must implement interface "%s".', $id, EventSubscriberInterface::class));
}
$class = $r->name;
ExtractingEventDispatcher::$subscriber = $class;
$extractingDispatcher->addSubscriber($extractingDispatcher);
foreach ($extractingDispatcher->listeners as $args) {
$args[1] = [new ServiceClosureArgument(new Reference($id)), $args[1]];
$definition->addMethodCall('addListener', $args);
if (isset($this->hotPathEvents[$args[0]])) {
$container->getDefinition($id)->addTag($this->hotPathTagName);
}
}
$extractingDispatcher->listeners = [];
}
}
}
/**
* @internal
*/
class ExtractingEventDispatcher extends EventDispatcher implements EventSubscriberInterface
{
public $listeners = [];
public static $subscriber;
public function addListener($eventName, $listener, $priority = 0)
{
$this->listeners[] = [$eventName, $listener[1], $priority];
}
public static function getSubscribedEvents()
{
$callback = [self::$subscriber, 'getSubscribedEvents'];
return $callback();
}
}