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vendor/symfony/event-dispatcher/DependencyInjection/AddEventAliasesPass.php

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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;
+
+/**
+ * This pass allows bundles to extend the list of event aliases.
+ *
+ * @author Alexander M. Turek <me@derrabus.de>
+ */
+class AddEventAliasesPass implements CompilerPassInterface
+{
+    private array $eventAliases;
+
+    public function __construct(array $eventAliases)
+    {
+        $this->eventAliases = $eventAliases;
+    }
+
+    public function process(ContainerBuilder $container): void
+    {
+        $eventAliases = $container->hasParameter('event_dispatcher.event_aliases') ? $container->getParameter('event_dispatcher.event_aliases') : [];
+
+        $container->setParameter(
+            'event_dispatcher.event_aliases',
+            array_merge($eventAliases, $this->eventAliases)
+        );
+    }
+}

vendor/symfony/event-dispatcher/DependencyInjection/RegisterListenersPass.php

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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\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
+{
+    private array $hotPathEvents = [];
+    private array $noPreloadEvents = [];
+
+    /**
+     * @return $this
+     */
+    public function setHotPathEvents(array $hotPathEvents): static
+    {
+        $this->hotPathEvents = array_flip($hotPathEvents);
+
+        return $this;
+    }
+
+    /**
+     * @return $this
+     */
+    public function setNoPreloadEvents(array $noPreloadEvents): static
+    {
+        $this->noPreloadEvents = array_flip($noPreloadEvents);
+
+        return $this;
+    }
+
+    public function process(ContainerBuilder $container): void
+    {
+        if (!$container->hasDefinition('event_dispatcher') && !$container->hasAlias('event_dispatcher')) {
+            return;
+        }
+
+        $aliases = [];
+
+        if ($container->hasParameter('event_dispatcher.event_aliases')) {
+            $aliases = $container->getParameter('event_dispatcher.event_aliases');
+        }
+
+        $globalDispatcherDefinition = $container->findDefinition('event_dispatcher');
+
+        foreach ($container->findTaggedServiceIds('kernel.event_listener', true) as $id => $events) {
+            $noPreload = 0;
+
+            foreach ($events as $event) {
+                $priority = $event['priority'] ?? 0;
+
+                if (!isset($event['event'])) {
+                    if ($container->getDefinition($id)->hasTag('kernel.event_subscriber')) {
+                        continue;
+                    }
+
+                    $event['method'] ??= '__invoke';
+                    $event['event'] = $this->getEventFromTypeDeclaration($container, $id, $event['method']);
+                }
+
+                $event['event'] = $aliases[$event['event']] ?? $event['event'];
+
+                if (!isset($event['method'])) {
+                    $event['method'] = 'on'.preg_replace_callback([
+                        '/(?<=\b|_)[a-z]/i',
+                        '/[^a-z0-9]/i',
+                    ], fn ($matches) => 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'])) {
+                        if (!$r->hasMethod('__invoke')) {
+                            throw new InvalidArgumentException(sprintf('None of the "%s" or "__invoke" methods exist for the service "%s". Please define the "method" attribute on "kernel.event_listener" tags.', $event['method'], $id));
+                        }
+
+                        $event['method'] = '__invoke';
+                    }
+                }
+
+                $dispatcherDefinition = $globalDispatcherDefinition;
+                if (isset($event['dispatcher'])) {
+                    $dispatcherDefinition = $container->findDefinition($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('container.hot_path');
+                } elseif (isset($this->noPreloadEvents[$event['event']])) {
+                    ++$noPreload;
+                }
+            }
+
+            if ($noPreload && \count($events) === $noPreload) {
+                $container->getDefinition($id)->addTag('container.no_preload');
+            }
+        }
+
+        $extractingDispatcher = new ExtractingEventDispatcher();
+
+        foreach ($container->findTaggedServiceIds('kernel.event_subscriber', 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;
+                }
+
+                $dispatcherDefinitions[$attributes['dispatcher']] = $container->findDefinition($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('container.hot_path');
+                } elseif (isset($this->noPreloadEvents[$args[0]])) {
+                    ++$noPreload;
+                }
+            }
+            if ($noPreload && \count($extractingDispatcher->listeners) === $noPreload) {
+                $container->getDefinition($id)->addTag('container.no_preload');
+            }
+            $extractingDispatcher->listeners = [];
+            ExtractingEventDispatcher::$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()) instanceof \ReflectionNamedType
+            || $type->isBuiltin()
+            || Event::class === ($name = $type->getName())
+        ) {
+            throw new InvalidArgumentException(sprintf('Service "%s" must define the "event" attribute on "kernel.event_listener" tags.', $id));
+        }
+
+        return $name;
+    }
+}
+
+/**
+ * @internal
+ */
+class ExtractingEventDispatcher extends EventDispatcher implements EventSubscriberInterface
+{
+    public array $listeners = [];
+
+    public static array $aliases = [];
+    public static string $subscriber;
+
+    public function addListener(string $eventName, callable|array $listener, int $priority = 0): void
+    {
+        $this->listeners[] = [$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;
+    }
+}