vendor/filp/whoops/src/Whoops/Handler/Handler.php

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<?php
/**
 * Whoops - php errors for cool kids
 * @author Filipe Dobreira <http://github.com/filp>
 */

namespace Whoops\Handler;

use Whoops\Exception\Inspector;
use Whoops\RunInterface;

/**
 * Abstract implementation of a Handler.
 */
abstract class Handler implements HandlerInterface
{
    /*
     Return constants that can be returned from Handler::handle
     to message the handler walker.
     */
    const DONE         = 0x10; // returning this is optional, only exists for
                               // semantic purposes
    /**
     * The Handler has handled the Throwable in some way, and wishes to skip any other Handler.
     * Execution will continue.
     */
    const LAST_HANDLER = 0x20;
    /**
     * The Handler has handled the Throwable in some way, and wishes to quit/stop execution
     */
    const QUIT         = 0x30;

    /**
     * @var RunInterface
     */
    private $run;

    /**
     * @var Inspector $inspector
     */
    private $inspector;

    /**
     * @var \Throwable $exception
     */
    private $exception;

    /**
     * @param RunInterface $run
     */
    public function setRun(RunInterface $run)
    {
        $this->run = $run;
    }

    /**
     * @return RunInterface
     */
    protected function getRun()
    {