| 1 | <?php |
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| 6 | |||
| 7 | final class CurriedFn implements FixedArityInterface |
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| 8 | { |
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| 9 | /** |
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| 10 | * @var callable |
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| 11 | */ |
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| 12 | private $fn; |
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| 13 | |||
| 14 | private int $arity; |
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| 15 | |||
| 16 | /** |
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| 17 | * @var array<int, mixed> $args |
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| 18 | */ |
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| 19 | private array $args = []; |
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| 20 | |||
| 21 | /** |
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| 22 | * @param int $arity |
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| 23 | * @param callable $fn, |
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| 24 | * @param mixed[] $args |
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| 25 | */ |
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| 26 | private function __construct(int $arity, callable $fn, array $args = []) |
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| 27 | { |
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| 28 | $this->arity = $arity; |
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| 29 | $this->fn = $fn; |
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| 30 | $this->args = $args; |
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| 31 | } |
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| 32 | |||
| 33 | public static function of(callable $fn): self |
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| 34 | { |
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| 35 | return ($fn instanceof static) |
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| 36 | ? new static($fn->arity, $fn->fn, $fn->args) |
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| 37 | : static::ofN(Phln::arity($fn), $fn); |
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| 38 | } |
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| 39 | |||
| 40 | public static function ofN(int $arity, callable $fn): self |
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| 41 | { |
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| 42 | return new static($arity, $fn); |
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| 43 | } |
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| 44 | |||
| 45 | /** |
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| 46 | * @param array<int, mixed> ...$args |
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| 47 | * @return CurriedFn|mixed |
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| 48 | */ |
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| 49 | public function __invoke(...$args) |
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| 50 | { |
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| 51 | $allArgs = array_merge($this->args, $args); |
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| 52 | |||
| 53 | return ($this->arity > count($allArgs)) |
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| 54 | ? new static($this->arity, $this->fn, $allArgs) |
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| 55 | : call_user_func_array($this->fn, $allArgs); |
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| 56 | } |
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| 63 |