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<?php |
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/** |
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* For the full copyright and license information, please view |
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* the LICENSE file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace loophp\fpt; |
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use Closure; |
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use Generator; |
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use ReflectionFunction; |
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use function array_slice; |
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use function count; |
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/** |
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* Stateless "Curry" application. |
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* |
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* @psalm-immutable |
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* |
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* phpcs:disable Generic.Files.LineLength.TooLong |
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*/ |
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final class Curry |
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{ |
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/** |
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* @pure |
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*/ |
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public static function of(): Closure |
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{ |
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return |
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/** |
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* @param Closure|callable-string $callable |
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*/ |
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static function (callable $callable, int $arity = 0, mixed ...$arguments): mixed { |
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if (0 === $arity) { |
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$reflection = (new ReflectionFunction($callable)); |
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$parameters = $reflection->getNumberOfParameters(); |
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$requiredParameters = $reflection->getNumberOfRequiredParameters(); |
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$arity = $parameters === $requiredParameters ? $parameters : $arity; |
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} |
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return self::curryN( |
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$callable, |
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$arity, |
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$parameters ?? $arity, |
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$requiredParameters ?? $arity, |
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...$arguments |
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); |
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}; |
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} |
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/** |
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* @param Closure|callable-string $callable |
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*/ |
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private static function curryN(callable $callable, int $arity, int $parameters, int $requiredParameters, mixed ...$arguments): mixed |
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{ |
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$countArguments = count($arguments); |
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return match (true) { |
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0 === $requiredParameters => static fn (): mixed => ($callable)(), |
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$countArguments >= $parameters, $countArguments >= $requiredParameters => ($callable)(...array_slice($arguments, 0, 0 !== $arity ? $arity : $countArguments)), |
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default => static fn (mixed ...$args): mixed => self::curryN($callable, $arity, $parameters, $requiredParameters, ...self::getArguments($arguments, $args)) |
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}; |
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} |
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/** |
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* @pure |
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* |
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* @param list<mixed> $args |
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* @param list<mixed> $argsNext |
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* |
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* @return Generator<int, mixed> |
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*/ |
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private static function getArguments(array $args, array $argsNext): Generator |
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{ |
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return yield from array_merge($args, $argsNext); |
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} |
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} |
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loophp /
fpt
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