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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 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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* @template T |
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* @psalm-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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* @psalm-param positive-int|null $arity |
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*/ |
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static function (callable $callable, ?int $arity = null, ?int $parameters = null, ?int $requiredParameters = null, ...$arguments): mixed { |
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if (null === $arity) { |
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$reflection = (new ReflectionFunction($callable)); |
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$parameters ??= $reflection->getNumberOfParameters(); |
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$requiredParameters ??= $reflection->getNumberOfRequiredParameters(); |
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$arity ??= $requiredParameters; |
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} else { |
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$parameters = $requiredParameters = $arity; |
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} |
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return self::curryN( |
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$callable, |
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$arity, |
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$parameters, |
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$requiredParameters, |
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...$arguments |
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); |
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}; |
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} |
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private static function curryN(callable $callable, ?int $arity = null, ?int $parameters = null, ?int $requiredParameters = null, ...$arguments): mixed |
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{ |
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// Normally the curry function takes one parameter at a time (returns a unary function). |
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return self::isComplete(count($arguments), $parameters, $requiredParameters) ? |
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($callable)(...$arguments) : |
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static fn (...$args): mixed => self::of()($callable, $arity, $parameters, $requiredParameters, ...self::getArguments($arguments, $args)); |
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} |
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/** |
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* @psalm-pure |
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* |
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* @psalm-param list<mixed> $args |
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* @psalm-param list<mixed> $argsNext |
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* |
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* @psalm-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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private static function isComplete(int $arguments, int $parameters, int $requiredParameters): bool |
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{ |
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return $arguments === $parameters || $arguments === $requiredParameters; |
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} |
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} |
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loophp /
fpt
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