257 lines
8.6 KiB
PHP
257 lines
8.6 KiB
PHP
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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\EventDispatcher;
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use Psr\EventDispatcher\StoppableEventInterface;
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use Symfony\Component\EventDispatcher\Debug\WrappedListener;
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/**
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* The EventDispatcherInterface is the central point of Symfony's event listener system.
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*
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* Listeners are registered on the manager and events are dispatched through the
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* manager.
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*
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* @author Guilherme Blanco <guilhermeblanco@hotmail.com>
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* @author Jonathan Wage <jonwage@gmail.com>
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* @author Roman Borschel <roman@code-factory.org>
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* @author Bernhard Schussek <bschussek@gmail.com>
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* @author Fabien Potencier <fabien@symfony.com>
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* @author Jordi Boggiano <j.boggiano@seld.be>
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* @author Jordan Alliot <jordan.alliot@gmail.com>
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* @author Nicolas Grekas <p@tchwork.com>
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*/
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class EventDispatcher implements EventDispatcherInterface
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{
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private array $listeners = [];
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private array $sorted = [];
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private array $optimized;
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public function __construct()
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{
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if (__CLASS__ === static::class) {
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$this->optimized = [];
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}
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}
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public function dispatch(object $event, string $eventName = null): object
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{
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$eventName ??= $event::class;
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if (isset($this->optimized)) {
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$listeners = $this->optimized[$eventName] ?? (empty($this->listeners[$eventName]) ? [] : $this->optimizeListeners($eventName));
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} else {
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$listeners = $this->getListeners($eventName);
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}
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if ($listeners) {
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$this->callListeners($listeners, $eventName, $event);
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}
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return $event;
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}
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public function getListeners(string $eventName = null): array
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{
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if (null !== $eventName) {
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if (empty($this->listeners[$eventName])) {
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return [];
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}
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if (!isset($this->sorted[$eventName])) {
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$this->sortListeners($eventName);
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}
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return $this->sorted[$eventName];
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}
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foreach ($this->listeners as $eventName => $eventListeners) {
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if (!isset($this->sorted[$eventName])) {
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$this->sortListeners($eventName);
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}
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}
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return array_filter($this->sorted);
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}
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public function getListenerPriority(string $eventName, callable|array $listener): ?int
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{
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if (empty($this->listeners[$eventName])) {
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return null;
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}
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if (\is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure && 2 >= \count($listener)) {
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$listener[0] = $listener[0]();
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$listener[1] ??= '__invoke';
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}
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foreach ($this->listeners[$eventName] as $priority => &$listeners) {
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foreach ($listeners as &$v) {
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if ($v !== $listener && \is_array($v) && isset($v[0]) && $v[0] instanceof \Closure && 2 >= \count($v)) {
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$v[0] = $v[0]();
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$v[1] ??= '__invoke';
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}
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if ($v === $listener || ($listener instanceof \Closure && $v == $listener)) {
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return $priority;
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}
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}
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}
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return null;
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}
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public function hasListeners(string $eventName = null): bool
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{
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if (null !== $eventName) {
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return !empty($this->listeners[$eventName]);
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}
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foreach ($this->listeners as $eventListeners) {
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if ($eventListeners) {
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return true;
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}
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}
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return false;
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}
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public function addListener(string $eventName, callable|array $listener, int $priority = 0)
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{
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$this->listeners[$eventName][$priority][] = $listener;
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unset($this->sorted[$eventName], $this->optimized[$eventName]);
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}
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public function removeListener(string $eventName, callable|array $listener)
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{
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if (empty($this->listeners[$eventName])) {
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return;
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}
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if (\is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure && 2 >= \count($listener)) {
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$listener[0] = $listener[0]();
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$listener[1] ??= '__invoke';
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}
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foreach ($this->listeners[$eventName] as $priority => &$listeners) {
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foreach ($listeners as $k => &$v) {
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if ($v !== $listener && \is_array($v) && isset($v[0]) && $v[0] instanceof \Closure && 2 >= \count($v)) {
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$v[0] = $v[0]();
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$v[1] ??= '__invoke';
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}
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if ($v === $listener || ($listener instanceof \Closure && $v == $listener)) {
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unset($listeners[$k], $this->sorted[$eventName], $this->optimized[$eventName]);
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}
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}
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if (!$listeners) {
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unset($this->listeners[$eventName][$priority]);
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}
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}
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}
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public function addSubscriber(EventSubscriberInterface $subscriber)
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{
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foreach ($subscriber->getSubscribedEvents() as $eventName => $params) {
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if (\is_string($params)) {
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$this->addListener($eventName, [$subscriber, $params]);
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} elseif (\is_string($params[0])) {
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$this->addListener($eventName, [$subscriber, $params[0]], $params[1] ?? 0);
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} else {
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foreach ($params as $listener) {
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$this->addListener($eventName, [$subscriber, $listener[0]], $listener[1] ?? 0);
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}
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}
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}
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}
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public function removeSubscriber(EventSubscriberInterface $subscriber)
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{
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foreach ($subscriber->getSubscribedEvents() as $eventName => $params) {
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if (\is_array($params) && \is_array($params[0])) {
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foreach ($params as $listener) {
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$this->removeListener($eventName, [$subscriber, $listener[0]]);
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}
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} else {
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$this->removeListener($eventName, [$subscriber, \is_string($params) ? $params : $params[0]]);
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}
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}
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}
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/**
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* Triggers the listeners of an event.
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*
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* This method can be overridden to add functionality that is executed
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* for each listener.
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*
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* @param callable[] $listeners The event listeners
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* @param string $eventName The name of the event to dispatch
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* @param object $event The event object to pass to the event handlers/listeners
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*/
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protected function callListeners(iterable $listeners, string $eventName, object $event)
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{
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$stoppable = $event instanceof StoppableEventInterface;
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foreach ($listeners as $listener) {
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if ($stoppable && $event->isPropagationStopped()) {
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break;
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}
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$listener($event, $eventName, $this);
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}
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}
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/**
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* Sorts the internal list of listeners for the given event by priority.
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*/
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private function sortListeners(string $eventName)
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{
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krsort($this->listeners[$eventName]);
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$this->sorted[$eventName] = [];
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foreach ($this->listeners[$eventName] as &$listeners) {
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foreach ($listeners as &$listener) {
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if (\is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure && 2 >= \count($listener)) {
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$listener[0] = $listener[0]();
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$listener[1] ??= '__invoke';
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}
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$this->sorted[$eventName][] = $listener;
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}
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}
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}
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/**
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* Optimizes the internal list of listeners for the given event by priority.
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*/
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private function optimizeListeners(string $eventName): array
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{
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krsort($this->listeners[$eventName]);
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$this->optimized[$eventName] = [];
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foreach ($this->listeners[$eventName] as &$listeners) {
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foreach ($listeners as &$listener) {
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$closure = &$this->optimized[$eventName][];
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if (\is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure && 2 >= \count($listener)) {
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$closure = static function (...$args) use (&$listener, &$closure) {
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if ($listener[0] instanceof \Closure) {
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$listener[0] = $listener[0]();
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$listener[1] ??= '__invoke';
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}
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($closure = $listener(...))(...$args);
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};
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} else {
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$closure = $listener instanceof WrappedListener ? $listener : $listener(...);
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}
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}
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}
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return $this->optimized[$eventName];
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}
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}
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