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<?php |
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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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class EventDispatcher implements EventDispatcherInterface |
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{ |
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private $listeners = []; |
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private $sorted = []; |
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private $optimized; |
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public function __construct() |
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{ |
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if (__CLASS__ === static::class) { |
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$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 = $eventName ?? \get_class($event); |
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if (null !== $this->optimized) { |
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$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) |
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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, $listener) |
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{ |
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if (empty($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] = $listener[1] ?? '__invoke'; |
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} |
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foreach ($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] = $v[1] ?? '__invoke'; |
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} |
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if ($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) |
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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, $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, $listener) |
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{ |
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if (empty($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] = $listener[1] ?? '__invoke'; |
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} |
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foreach ($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] = $v[1] ?? '__invoke'; |
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} |
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if ($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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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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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 $k => &$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] = $listener[1] ?? '__invoke'; |
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} |
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$this->sorted[$eventName][] = $listener; |
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} |
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} |
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} |
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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] = $listener[1] ?? '__invoke'; |
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} |
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($closure = \Closure::fromCallable($listener))(...$args); |
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}; |
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} else { |
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$closure = $listener instanceof \Closure || $listener instanceof WrappedListener ? $listener : \Closure::fromCallable($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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