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<?php

declare(strict_types=1);

/*
 * This file is part of the league/commonmark package.
 *
 * (c) Colin O'Dell <colinodell@gmail.com>
 *
 * Original code based on the Symfony EventDispatcher "Event" contract
 *  - (c) 2018-2019 Fabien Potencier
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace League\CommonMark\Event;

use Psr\EventDispatcher\StoppableEventInterface;

/**
 * Base class for classes containing event data.
 *
 * This class contains no event data. It is used by events that do not pass
 * state information to an event handler when an event is raised.
 *
 * You can call the method stopPropagation() to abort the execution of
 * further listeners in your event listener.
 */
abstract class AbstractEvent implements StoppableEventInterface
{
    /** @psalm-readonly-allow-private-mutation */
    private bool $propagationStopped = false;

    /**
     * Returns whether further event listeners should be triggered.
     */
    final public function isPropagationStopped(): bool
    {
        return $this->propagationStopped;
    }

    /**
     * Stops the propagation of the event to further event listeners.
     *
     * If multiple event listeners are connected to the same event, no
     * further event listener will be triggered once any trigger calls
     * stopPropagation().
     */
    final public function stopPropagation(): void
    {
        $this->propagationStopped = true;
    }
}