vendor/opis/closure/src/ReflectionClosure.php

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<?php
/* ===========================================================================
 * Copyright (c) 2018-2019 Zindex Software
 *
 * Licensed under the MIT License
 * =========================================================================== */

namespace Opis\Closure;

use Closure;
use ReflectionFunction;

class ReflectionClosure extends ReflectionFunction
{
    protected $code;
    protected $tokens;
    protected $hashedName;
    protected $useVariables;
    protected $isStaticClosure;
    protected $isScopeRequired;
    protected $isBindingRequired;
    protected $isShortClosure;

    protected static $files = array();
    protected static $classes = array();
    protected static $functions = array();
    protected static $constants = array();
    protected static $structures = array();


    /**
     * ReflectionClosure constructor.
     * @param Closure $closure
     * @param string|null $code
     * @throws \ReflectionException
     */
    public function __construct(Closure $closure, $code = null)
    {
        $this->code = $code;
        parent::__construct($closure);
    }

    /**
     * @return bool
     */
    public function isStatic()
    {
        if ($this->isStaticClosure === null) {
            $this->isStaticClosure = strtolower(substr($this->getCode(), 0, 6)) === 'static';
        }

        return $this->isStaticClosure;
    }

    public function isShortClosure()
    {
        if ($this->isShortClosure === null) {
            $code = $this->getCode();
            if ($this->isStatic()) {
                $code = substr($code, 6);