loophp\combinator\Combinator\Y

Complexity

Total Complexity

3

Size/Duplication

Total Lines	42
Duplicated Lines	0 %

Test Coverage

Coverage

100%

Importance

Changes	1
Bugs	0	Features	0

3 Methods

Rating	Name	Duplication	Size	Complexity
A	__invoke()	0	13	1
A	__construct()	0	3	1
A	closure()	0	4	1

<?php

declare(strict_types=1);

namespace loophp\combinator\Combinator;

use loophp\combinator\Combinator;

/**
 * Class Y.
 */
final class Y extends Combinator
{
    /**
     * @var callable
     */
    private $f;

    /**
     * Y constructor.
     *
     * @param callable $f
     */
    public function __construct(callable $f)
    {
        $this->f = $f;
    }

    /**
     * @return mixed
     */
    public function __invoke()
    {
        $callable = $this->f;

        $f = static function (callable $f) use ($callable): callable {
            return $callable(
                static function (...$arguments) use ($f) {
                    return $f($f)(...$arguments);
                }
            );
        };

        return $f($f);
    }

    /**
     * @return callable
     */
    public static function closure(): callable
    {
        return static function (callable $f) {
            return (new self($f))();
        };
    }
}