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<?php declare(strict_types=1);
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/*
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* This file is part of Evenement.
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*
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* (c) Igor Wiedler <igor@wiedler.ch>
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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 Evenement;
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use InvalidArgumentException;
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trait EventEmitterTrait
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{
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protected $listeners = [];
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protected $onceListeners = [];
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public function on($event, callable $listener)
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{
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if ($event === null) {
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throw new InvalidArgumentException('event name must not be null');
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}
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if (!isset($this->listeners[$event])) {
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$this->listeners[$event] = [];
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}
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$this->listeners[$event][] = $listener;
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return $this;
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}
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public function once($event, callable $listener)
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{
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if ($event === null) {
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throw new InvalidArgumentException('event name must not be null');
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}
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if (!isset($this->onceListeners[$event])) {
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$this->onceListeners[$event] = [];
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}
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$this->onceListeners[$event][] = $listener;
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return $this;
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}
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public function removeListener($event, callable $listener)
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{
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if ($event === null) {
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throw new InvalidArgumentException('event name must not be null');
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}
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if (isset($this->listeners[$event])) {
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$index = \array_search($listener, $this->listeners[$event], true);
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if (false !== $index) {
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unset($this->listeners[$event][$index]);
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if (\count($this->listeners[$event]) === 0) {
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unset($this->listeners[$event]);
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}
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}
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}
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if (isset($this->onceListeners[$event])) {
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$index = \array_search($listener, $this->onceListeners[$event], true);
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if (false !== $index) {
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unset($this->onceListeners[$event][$index]);
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if (\count($this->onceListeners[$event]) === 0) {
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unset($this->onceListeners[$event]);
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}
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}
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}
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}
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public function removeAllListeners($event = null)
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{
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if ($event !== null) {
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unset($this->listeners[$event]);
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} else {
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$this->listeners = [];
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}
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if ($event !== null) {
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unset($this->onceListeners[$event]);
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} else {
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$this->onceListeners = [];
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}
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}
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public function listeners($event = null): array
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{
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if ($event === null) {
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$events = [];
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$eventNames = \array_unique(
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\array_merge(\array_keys($this->listeners), \array_keys($this->onceListeners))
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);
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foreach ($eventNames as $eventName) {
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$events[$eventName] = \array_merge(
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isset($this->listeners[$eventName]) ? $this->listeners[$eventName] : [],
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isset($this->onceListeners[$eventName]) ? $this->onceListeners[$eventName] : []
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);
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}
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return $events;
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}
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return \array_merge(
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isset($this->listeners[$event]) ? $this->listeners[$event] : [],
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isset($this->onceListeners[$event]) ? $this->onceListeners[$event] : []
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);
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}
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public function emit($event, array $arguments = [])
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{
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if ($event === null) {
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throw new InvalidArgumentException('event name must not be null');
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}
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if (isset($this->listeners[$event])) {
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foreach ($this->listeners[$event] as $listener) {
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$listener(...$arguments);
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}
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}
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if (isset($this->onceListeners[$event])) {
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$listeners = $this->onceListeners[$event];
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unset($this->onceListeners[$event]);
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foreach ($listeners as $listener) {
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$listener(...$arguments);
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}
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}
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}
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}
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