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vendor/symfony/event-dispatcher/EventDispatcher.php
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vendor/symfony/event-dispatcher/EventDispatcher.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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/**
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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 $listeners = [];
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private $sorted = [];
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/**
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* {@inheritdoc}
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*/
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public function dispatch($eventName, Event $event = null)
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{
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if (null === $event) {
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$event = new Event();
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}
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if ($listeners = $this->getListeners($eventName)) {
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$this->doDispatch($listeners, $eventName, $event);
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}
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return $event;
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}
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/**
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* {@inheritdoc}
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*/
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public function getListeners($eventName = null)
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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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/**
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* {@inheritdoc}
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*/
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public function getListenerPriority($eventName, $listener)
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{
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if (empty($this->listeners[$eventName])) {
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return;
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}
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if (\is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure) {
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$listener[0] = $listener[0]();
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}
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foreach ($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]) && $v[0] instanceof \Closure) {
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$v[0] = $v[0]();
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$this->listeners[$eventName][$priority][$k] = $v;
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}
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if ($v === $listener) {
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return $priority;
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}
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}
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function hasListeners($eventName = null)
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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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/**
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* {@inheritdoc}
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*/
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public function addListener($eventName, $listener, $priority = 0)
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{
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$this->listeners[$eventName][$priority][] = $listener;
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unset($this->sorted[$eventName]);
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}
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/**
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* {@inheritdoc}
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*/
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public function removeListener($eventName, $listener)
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{
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if (empty($this->listeners[$eventName])) {
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return;
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}
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if (\is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure) {
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$listener[0] = $listener[0]();
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}
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foreach ($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]) && $v[0] instanceof \Closure) {
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$v[0] = $v[0]();
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}
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if ($v === $listener) {
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unset($listeners[$k], $this->sorted[$eventName]);
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} else {
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$listeners[$k] = $v;
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}
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}
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if ($listeners) {
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$this->listeners[$eventName][$priority] = $listeners;
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} else {
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unset($this->listeners[$eventName][$priority]);
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}
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}
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}
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/**
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* {@inheritdoc}
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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, $params[0]], isset($params[1]) ? $params[1] : 0);
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} else {
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foreach ($params as $listener) {
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$this->addListener($eventName, [$subscriber, $listener[0]], isset($listener[1]) ? $listener[1] : 0);
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}
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}
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}
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}
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/**
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* {@inheritdoc}
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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 Event $event The event object to pass to the event handlers/listeners
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*/
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protected function doDispatch($listeners, $eventName, Event $event)
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{
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foreach ($listeners as $listener) {
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if ($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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* @param string $eventName The name of the event
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*/
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private function sortListeners($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 $priority => $listeners) {
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foreach ($listeners as $k => $listener) {
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if (\is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure) {
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$listener[0] = $listener[0]();
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$this->listeners[$eventName][$priority][$k] = $listener;
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}
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$this->sorted[$eventName][] = $listener;
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}
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}
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}
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}
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