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<?php
namespace GuzzleHttp\Event;
/**
* Guzzle event emitter.
*
* Some of this class is based on the Symfony EventDispatcher component, which
* ships with the following license:
*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*
* @link https://github.com/symfony/symfony/tree/master/src/Symfony/Component/EventDispatcher
*/
class Emitter implements EmitterInterface
{
/** @var array */
private $listeners = [];
/** @var array */
private $sorted = [];
public function on($eventName, callable $listener, $priority = 0)
{
if ($priority === 'first') {
$priority = isset($this->listeners[$eventName])
? max(array_keys($this->listeners[$eventName])) + 1
: 1;
} elseif ($priority === 'last') {
$priority = isset($this->listeners[$eventName])
? min(array_keys($this->listeners[$eventName])) - 1
: -1;
}
$this->listeners[$eventName][$priority][] = $listener;
unset($this->sorted[$eventName]);
}
public function once($eventName, callable $listener, $priority = 0)
{
$onceListener = function (
EventInterface $event,
$eventName
) use (&$onceListener, $eventName, $listener, $priority) {
$this->removeListener($eventName, $onceListener);
$listener($event, $eventName, $this);
};
$this->on($eventName, $onceListener, $priority);
}
public function removeListener($eventName, callable $listener)
{
if (empty($this->listeners[$eventName])) {
return;
}
foreach ($this->listeners[$eventName] as $priority => $listeners) {
if (false !== ($key = array_search($listener, $listeners, true))) {
unset(
$this->listeners[$eventName][$priority][$key],
$this->sorted[$eventName]
);
}
}
}
public function listeners($eventName = null)
{
// Return all events in a sorted priority order
if ($eventName === null) {
foreach (array_keys($this->listeners) as $eventName) {
if (empty($this->sorted[$eventName])) {
$this->listeners($eventName);
}
}
return $this->sorted;
}
// Return the listeners for a specific event, sorted in priority order
if (empty($this->sorted[$eventName])) {
$this->sorted[$eventName] = [];
if (isset($this->listeners[$eventName])) {
krsort($this->listeners[$eventName], SORT_NUMERIC);
foreach ($this->listeners[$eventName] as $listeners) {
foreach ($listeners as $listener) {
$this->sorted[$eventName][] = $listener;
}
}
}
}
return $this->sorted[$eventName];
}
public function hasListeners($eventName)
{
return !empty($this->listeners[$eventName]);
}
public function emit($eventName, EventInterface $event)
{
if (isset($this->listeners[$eventName])) {
foreach ($this->listeners($eventName) as $listener) {
$listener($event, $eventName);
if ($event->isPropagationStopped()) {
break;
}
}
}
return $event;
}
public function attach(SubscriberInterface $subscriber)
{
foreach ($subscriber->getEvents() as $eventName => $listeners) {
if (is_array($listeners[0])) {
foreach ($listeners as $listener) {
$this->on(
$eventName,
[$subscriber, $listener[0]],
isset($listener[1]) ? $listener[1] : 0
);
}
} else {
$this->on(
$eventName,
[$subscriber, $listeners[0]],
isset($listeners[1]) ? $listeners[1] : 0
);
}
}
}
public function detach(SubscriberInterface $subscriber)
{
foreach ($subscriber->getEvents() as $eventName => $listener) {
$this->removeListener($eventName, [$subscriber, $listener[0]]);
}
}
}
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