Subversion-Projekte lars-tiefland.laravel_shop

<?php

/*

 * 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.

 */

namespace Symfony\Component\EventDispatcher;

use Psr\EventDispatcher\StoppableEventInterface;

use Symfony\Component\EventDispatcher\Debug\WrappedListener;

/**

 * The EventDispatcherInterface is the central point of Symfony's event listener system.

 *

 * Listeners are registered on the manager and events are dispatched through the

 * manager.

 *

 * @author Guilherme Blanco <guilhermeblanco@hotmail.com>

 * @author Jonathan Wage <jonwage@gmail.com>

 * @author Roman Borschel <roman@code-factory.org>

 * @author Bernhard Schussek <bschussek@gmail.com>

 * @author Fabien Potencier <fabien@symfony.com>

 * @author Jordi Boggiano <j.boggiano@seld.be>

 * @author Jordan Alliot <jordan.alliot@gmail.com>

 * @author Nicolas Grekas <p@tchwork.com>

 */

class EventDispatcher implements EventDispatcherInterface

{

    private array $listeners = [];

    private array $sorted = [];

    private array $optimized;

    public function __construct()

    {

        if (__CLASS__ === static::class) {

            $this->optimized = [];

        }

    }

    public function dispatch(object $event, string $eventName = null): object

    {

        $eventName ??= $event::class;

        if (isset($this->optimized)) {

            $listeners = $this->optimized[$eventName] ?? (empty($this->listeners[$eventName]) ? [] : $this->optimizeListeners($eventName));

        } else {

            $listeners = $this->getListeners($eventName);

        }

        if ($listeners) {

            $this->callListeners($listeners, $eventName, $event);

        }

        return $event;

    }

    public function getListeners(string $eventName = null): array

    {

        if (null !== $eventName) {

            if (empty($this->listeners[$eventName])) {

                return [];

            }

            if (!isset($this->sorted[$eventName])) {

                $this->sortListeners($eventName);

            }

            return $this->sorted[$eventName];

        }

        foreach ($this->listeners as $eventName => $eventListeners) {

            if (!isset($this->sorted[$eventName])) {

                $this->sortListeners($eventName);

            }

        }

        return array_filter($this->sorted);

    }

    public function getListenerPriority(string $eventName, callable|array $listener): ?int

    {

        if (empty($this->listeners[$eventName])) {

            return null;

        }

        if (\is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure && 2 >= \count($listener)) {

            $listener[0] = $listener[0]();

            $listener[1] ??= '__invoke';

        }

        foreach ($this->listeners[$eventName] as $priority => &$listeners) {

            foreach ($listeners as &$v) {

                if ($v !== $listener && \is_array($v) && isset($v[0]) && $v[0] instanceof \Closure && 2 >= \count($v)) {

                    $v[0] = $v[0]();

                    $v[1] ??= '__invoke';

                }

                if ($v === $listener || ($listener instanceof \Closure && $v == $listener)) {

                    return $priority;

                }

            }

        }

        return null;

    }

    public function hasListeners(string $eventName = null): bool

    {

        if (null !== $eventName) {

            return !empty($this->listeners[$eventName]);

        }

        foreach ($this->listeners as $eventListeners) {

            if ($eventListeners) {

                return true;

            }

        }

        return false;

    }

    public function addListener(string $eventName, callable|array $listener, int $priority = 0)

    {

        $this->listeners[$eventName][$priority][] = $listener;

        unset($this->sorted[$eventName], $this->optimized[$eventName]);

    }

    public function removeListener(string $eventName, callable|array $listener)

    {

        if (empty($this->listeners[$eventName])) {

            return;

        }

        if (\is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure && 2 >= \count($listener)) {

            $listener[0] = $listener[0]();

            $listener[1] ??= '__invoke';

        }

        foreach ($this->listeners[$eventName] as $priority => &$listeners) {

            foreach ($listeners as $k => &$v) {

                if ($v !== $listener && \is_array($v) && isset($v[0]) && $v[0] instanceof \Closure && 2 >= \count($v)) {

                    $v[0] = $v[0]();

                    $v[1] ??= '__invoke';

                }

                if ($v === $listener || ($listener instanceof \Closure && $v == $listener)) {

                    unset($listeners[$k], $this->sorted[$eventName], $this->optimized[$eventName]);

                }

            }

            if (!$listeners) {

                unset($this->listeners[$eventName][$priority]);

            }

        }

    }

    public function addSubscriber(EventSubscriberInterface $subscriber)

    {

        foreach ($subscriber->getSubscribedEvents() as $eventName => $params) {

            if (\is_string($params)) {

                $this->addListener($eventName, [$subscriber, $params]);

            } elseif (\is_string($params[0])) {

                $this->addListener($eventName, [$subscriber, $params[0]], $params[1] ?? 0);

            } else {

                foreach ($params as $listener) {

                    $this->addListener($eventName, [$subscriber, $listener[0]], $listener[1] ?? 0);

                }

            }

        }

    }

    public function removeSubscriber(EventSubscriberInterface $subscriber)

    {

        foreach ($subscriber->getSubscribedEvents() as $eventName => $params) {

            if (\is_array($params) && \is_array($params[0])) {

                foreach ($params as $listener) {

                    $this->removeListener($eventName, [$subscriber, $listener[0]]);

                }

            } else {

                $this->removeListener($eventName, [$subscriber, \is_string($params) ? $params : $params[0]]);

            }

        }

    }

    /**

     * Triggers the listeners of an event.

     *

     * This method can be overridden to add functionality that is executed

     * for each listener.

     *

     * @param callable[] $listeners The event listeners

     * @param string     $eventName The name of the event to dispatch

     * @param object     $event     The event object to pass to the event handlers/listeners

     */

    protected function callListeners(iterable $listeners, string $eventName, object $event)

    {

        $stoppable = $event instanceof StoppableEventInterface;

        foreach ($listeners as $listener) {

            if ($stoppable && $event->isPropagationStopped()) {

                break;

            }

            $listener($event, $eventName, $this);

        }

    }

    /**

     * Sorts the internal list of listeners for the given event by priority.

     */

    private function sortListeners(string $eventName)

    {

        krsort($this->listeners[$eventName]);

        $this->sorted[$eventName] = [];

        foreach ($this->listeners[$eventName] as &$listeners) {

            foreach ($listeners as &$listener) {

                if (\is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure && 2 >= \count($listener)) {

                    $listener[0] = $listener[0]();

                    $listener[1] ??= '__invoke';

                }

                $this->sorted[$eventName][] = $listener;

            }

        }

    }

    /**

     * Optimizes the internal list of listeners for the given event by priority.

     */

    private function optimizeListeners(string $eventName): array

    {

        krsort($this->listeners[$eventName]);

        $this->optimized[$eventName] = [];

        foreach ($this->listeners[$eventName] as &$listeners) {

            foreach ($listeners as &$listener) {

                $closure = &$this->optimized[$eventName][];

                if (\is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure && 2 >= \count($listener)) {

                    $closure = static function (...$args) use (&$listener, &$closure) {

                        if ($listener[0] instanceof \Closure) {

                            $listener[0] = $listener[0]();

                            $listener[1] ??= '__invoke';

                        }

                        ($closure = $listener(...))(...$args);

                    };

                } else {

                    $closure = $listener instanceof WrappedListener ? $listener : $listener(...);

                }

            }

        }

        return $this->optimized[$eventName];

    }

}