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<?php declare(strict_types=1);
/*
* This file is part of Evenement.
*
* (c) Igor Wiedler <igor@wiedler.ch>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Evenement;
use InvalidArgumentException;
use function count;
use function array_keys;
use function array_merge;
use function array_search;
use function array_unique;
use function array_values;
trait EventEmitterTrait
{
protected $listeners = [];
protected $onceListeners = [];
public function on($event, callable $listener)
{
if ($event === null) {
throw new InvalidArgumentException('event name must not be null');
}
if (!isset($this->listeners[$event])) {
$this->listeners[$event] = [];
}
$this->listeners[$event][] = $listener;
return $this;
}
public function once($event, callable $listener)
{
if ($event === null) {
throw new InvalidArgumentException('event name must not be null');
}
if (!isset($this->onceListeners[$event])) {
$this->onceListeners[$event] = [];
}
$this->onceListeners[$event][] = $listener;
return $this;
}
public function removeListener($event, callable $listener)
{
if ($event === null) {
throw new InvalidArgumentException('event name must not be null');
}
if (isset($this->listeners[$event])) {
$index = array_search($listener, $this->listeners[$event], true);
if (false !== $index) {
unset($this->listeners[$event][$index]);
if (count($this->listeners[$event]) === 0) {
unset($this->listeners[$event]);
}
}
}
if (isset($this->onceListeners[$event])) {
$index = array_search($listener, $this->onceListeners[$event], true);
if (false !== $index) {
unset($this->onceListeners[$event][$index]);
if (count($this->onceListeners[$event]) === 0) {
unset($this->onceListeners[$event]);
}
}
}
}
public function removeAllListeners($event = null)
{
if ($event !== null) {
unset($this->listeners[$event]);
} else {
$this->listeners = [];
}
if ($event !== null) {
unset($this->onceListeners[$event]);
} else {
$this->onceListeners = [];
}
}
public function listeners($event = null): array
{
if ($event === null) {
$events = [];
$eventNames = array_unique(
array_merge(
array_keys($this->listeners),
array_keys($this->onceListeners)
)
);
foreach ($eventNames as $eventName) {
$events[$eventName] = array_merge(
isset($this->listeners[$eventName]) ? $this->listeners[$eventName] : [],
isset($this->onceListeners[$eventName]) ? $this->onceListeners[$eventName] : []
);
}
return $events;
}
return array_merge(
isset($this->listeners[$event]) ? $this->listeners[$event] : [],
isset($this->onceListeners[$event]) ? $this->onceListeners[$event] : []
);
}
public function emit($event, array $arguments = [])
{
if ($event === null) {
throw new InvalidArgumentException('event name must not be null');
}
$listeners = [];
if (isset($this->listeners[$event])) {
$listeners = array_values($this->listeners[$event]);
}
$onceListeners = [];
if (isset($this->onceListeners[$event])) {
$onceListeners = array_values($this->onceListeners[$event]);
}
if(empty($listeners) === false) {
foreach ($listeners as $listener) {
$listener(...$arguments);
}
}
if(empty($onceListeners) === false) {
unset($this->onceListeners[$event]);
foreach ($onceListeners as $listener) {
$listener(...$arguments);
}
}
}
}
|
