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📄 AddEventAliasesPass.php(1.26 KB)
📄 RegisterListenersPass.php(8.68 KB)

Editing: RegisterListenersPass.php

<?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;
use Symfony\Contracts\EventDispatcher\Event;

/**
 * Compiler pass to register tagged services for an event dispatcher.
 */
class RegisterListenersPass implements CompilerPassInterface
{
    protected $dispatcherService;
    protected $listenerTag;
    protected $subscriberTag;
    protected $eventAliasesParameter;

private $hotPathEvents = [];
    private $hotPathTagName;
    private $noPreloadEvents = [];
    private $noPreloadTagName;

public function __construct(string $dispatcherService = 'event_dispatcher', string $listenerTag = 'kernel.event_listener', string $subscriberTag = 'kernel.event_subscriber', string $eventAliasesParameter = 'event_dispatcher.event_aliases')
    {
        $this->dispatcherService = $dispatcherService;
        $this->listenerTag = $listenerTag;
        $this->subscriberTag = $subscriberTag;
        $this->eventAliasesParameter = $eventAliasesParameter;
    }

/**
     * @return $this
     */
    public function setHotPathEvents(array $hotPathEvents, string $tagName = 'container.hot_path')
    {
        $this->hotPathEvents = array_flip($hotPathEvents);
        $this->hotPathTagName = $tagName;

return $this;
    }

/**
     * @return $this
     */
    public function setNoPreloadEvents(array $noPreloadEvents, string $tagName = 'container.no_preload'): self
    {
        $this->noPreloadEvents = array_flip($noPreloadEvents);
        $this->noPreloadTagName = $tagName;

return $this;
    }

public function process(ContainerBuilder $container)
    {
        if (!$container->hasDefinition($this->dispatcherService) && !$container->hasAlias($this->dispatcherService)) {
            return;
        }

$aliases = [];

if ($container->hasParameter($this->eventAliasesParameter)) {
            $aliases = $container->getParameter($this->eventAliasesParameter);
        }

$globalDispatcherDefinition = $container->findDefinition($this->dispatcherService);

foreach ($container->findTaggedServiceIds($this->listenerTag, true) as $id => $events) {
            $noPreload = 0;

foreach ($events as $event) {
                $priority = isset($event['priority']) ? $event['priority'] : 0;

if (!isset($event['event'])) {
                    if ($container->getDefinition($id)->hasTag($this->subscriberTag)) {
                        continue;
                    }

$event['method'] = $event['method'] ?? '__invoke';
                    $event['event'] = $this->getEventFromTypeDeclaration($container, $id, $event['method']);
                }

$event['event'] = $aliases[$event['event']] ?? $event['event'];

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']);

if (null !== ($class = $container->getDefinition($id)->getClass()) && ($r = $container->getReflectionClass($class, false)) && !$r->hasMethod($event['method']) && $r->hasMethod('__invoke')) {
                        $event['method'] = '__invoke';
                    }
                }

$dispatcherDefinition = $globalDispatcherDefinition;
                if (isset($event['dispatcher'])) {
                    $dispatcherDefinition = $container->getDefinition($event['dispatcher']);
                }

$dispatcherDefinition->addMethodCall('addListener', [$event['event'], [new ServiceClosureArgument(new Reference($id)), $event['method']], $priority]);

if (isset($this->hotPathEvents[$event['event']])) {
                    $container->getDefinition($id)->addTag($this->hotPathTagName);
                } elseif (isset($this->noPreloadEvents[$event['event']])) {
                    ++$noPreload;
                }
            }

if ($noPreload && \count($events) === $noPreload) {
                $container->getDefinition($id)->addTag($this->noPreloadTagName);
            }
        }

$extractingDispatcher = new ExtractingEventDispatcher();

foreach ($container->findTaggedServiceIds($this->subscriberTag, true) as $id => $tags) {
            $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;

$dispatcherDefinitions = [];
            foreach ($tags as $attributes) {
                if (!isset($attributes['dispatcher']) || isset($dispatcherDefinitions[$attributes['dispatcher']])) {
                    continue;
                }

$dispatcherDefinitions[] = $container->getDefinition($attributes['dispatcher']);
            }

if (!$dispatcherDefinitions) {
                $dispatcherDefinitions = [$globalDispatcherDefinition];
            }

$noPreload = 0;
            ExtractingEventDispatcher::$aliases = $aliases;
            ExtractingEventDispatcher::$subscriber = $class;
            $extractingDispatcher->addSubscriber($extractingDispatcher);
            foreach ($extractingDispatcher->listeners as $args) {
                $args[1] = [new ServiceClosureArgument(new Reference($id)), $args[1]];
                foreach ($dispatcherDefinitions as $dispatcherDefinition) {
                    $dispatcherDefinition->addMethodCall('addListener', $args);
                }

if (isset($this->hotPathEvents[$args[0]])) {
                    $container->getDefinition($id)->addTag($this->hotPathTagName);
                } elseif (isset($this->noPreloadEvents[$args[0]])) {
                    ++$noPreload;
                }
            }
            if ($noPreload && \count($extractingDispatcher->listeners) === $noPreload) {
                $container->getDefinition($id)->addTag($this->noPreloadTagName);
            }
            $extractingDispatcher->listeners = [];
            ExtractingEventDispatcher::$aliases = [];
        }
    }

private function getEventFromTypeDeclaration(ContainerBuilder $container, string $id, string $method): string
    {
        if (
            null === ($class = $container->getDefinition($id)->getClass())
            || !($r = $container->getReflectionClass($class, false))
            || !$r->hasMethod($method)
            || 1 > ($m = $r->getMethod($method))->getNumberOfParameters()
            || !($type = $m->getParameters()[0]->getType())
            || $type->isBuiltin()
            || Event::class === ($name = $type->getName())
        ) {
            throw new InvalidArgumentException(sprintf('Service "%s" must define the "event" attribute on "%s" tags.', $id, $this->listenerTag));
        }

return $name;
    }
}

/**
 * @internal
 */
class ExtractingEventDispatcher extends EventDispatcher implements EventSubscriberInterface
{
    public $listeners = [];

public static $aliases = [];
    public static $subscriber;

public function addListener(string $eventName, $listener, int $priority = 0)
    {
        $this->listeners[] = [$eventName, $listener[1], $priority];
    }

public static function getSubscribedEvents(): array
    {
        $events = [];

foreach ([self::$subscriber, 'getSubscribedEvents']() as $eventName => $params) {
            $events[self::$aliases[$eventName] ?? $eventName] = $params;
        }

return $events;
    }
}

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