loophp\fpt\Curry

Complexity

Total Complexity

4

Size/Duplication

Total Lines	49
Duplicated Lines	0 %

Test Coverage

Coverage

100%

Importance

Changes	3
Bugs	0	Features	0

3 Methods

Rating	Name	Duplication	Size	Complexity
A	of()	0	16	1
A	curryN()	0	11	2
A	getArguments()	0	3	1

<?php

/**
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

declare(strict_types=1);

namespace loophp\fpt;

use Closure;
use Generator;
use ReflectionFunction;

use function count;

/**
 * @psalm-immutable
 *
 * phpcs:disable Generic.Files.LineLength.TooLong
 */
final class Curry
{
    /**
     * @template T
     * @psalm-pure
     */
    public static function of(): Closure
    {
        return
            /**
             * @psalm-param positive-int|null $arity
             */
            static fn (callable $callable, ?int $arity = null): Closure =>
            /**
             * @psalm-param mixed ...$args
             *
             * @return mixed
             */
            static fn (...$args): mixed => self::curryN(
                ($arity ?? (new ReflectionFunction($callable))->getNumberOfRequiredParameters()) - count($args),
                $callable,
                ...self::getArguments([], $args)
            );
    }

    private static function curryN(int $numberOfArguments, callable $function, ...$args): mixed
    {
        return (0 >= $numberOfArguments)
            ? $function(...$args)
            :
            /**
             * @psalm-param mixed ...$argsNext
             *
             * @return mixed
             */
            static fn (...$argsNext): mixed => self::curryN($numberOfArguments - count($argsNext), $function, ...self::getArguments($args, $argsNext));
    }

    /**
     * @psalm-pure
     *
     * @psalm-param list<mixed> $args
     * @psalm-param list<mixed> $argsNext
     *
     * @psalm-return Generator<int, mixed>
     */
    private static function getArguments(array $args = [], array $argsNext = []): Generator
    {
        return yield from array_merge($args, $argsNext);
    }
}