<?php

namespace Composer\Script;

use Composer\Composer;
use Composer\EventDispatcher\Event as BaseEvent;
use Composer\IO\IOInterface;

/**
 * The script event class
 *
 * @author François Pluchino <francois.pluchino@opendisplay.com>
 * @author Nils Adermann <naderman@naderman.de>
 */
class Event extends BaseEvent
{
    /** @var Composer The composer instance */
    private $composer;

    /** @var IOInterface The IO instance */
    private $io;

    /** @var bool Dev mode flag */
    private $devMode;

    /** @var BaseEvent|null */
    private $originatingEvent;

    /**
     * Constructor.
     *
     * @param string $name The event name
     * @param Composer $composer The composer object
     * @param IOInterface $io The IOInterface object
     * @param bool $devMode Whether or not we are in dev mode
     * @param array<string|int|float|bool|null> $args Arguments passed by the user
     * @param mixed[] $flags Optional flags to pass data not as argument
     */
    public function __construct(
        string $name,
        Composer $composer,
        IOInterface $io,
        bool $devMode = false,
        array $args = [],
        array $flags = [],
    ) {
        parent::__construct($name, $args, $flags);
        $this->composer = $composer;
        $this->io = $io;
        $this->devMode = $devMode;
    }

    /**
     * Returns the composer instance.
     */
    public function getComposer(): Composer
    {
        return $this->composer;
    }

    /**
     * Returns the IO instance.
     */
    public function getIO(): IOInterface
    {
        return $this->io;
    }

    /**
     * Return the dev mode flag
     */
    public function isDevMode(): bool
    {
        return $this->devMode;
    }

    /**
     * Set the originating event.
     *
     * @return ?BaseEvent
     */
    public function getOriginatingEvent(): ?BaseEvent
    {
        return $this->originatingEvent;
    }

    /**
     * Set the originating event.
     *
     * @return $this
     */
    public function setOriginatingEvent(BaseEvent $event): self
    {
        $this->originatingEvent = $this->calculateOriginatingEvent($event);

        return $this;
    }

    /**
     * Returns the upper-most event in chain.
     */
    private function calculateOriginatingEvent(BaseEvent $event): BaseEvent
    {
        if ($event instanceof Event && $event->getOriginatingEvent()) {
            return $this->calculateOriginatingEvent($event->getOriginatingEvent());
        }

        return $event;
    }
}
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