| 1: | <?php declare(strict_types=1); |
| 2: | |
| 3: | namespace Salient\Iterator; |
| 4: | |
| 5: | use Salient\Utility\Get; |
| 6: | use Closure; |
| 7: | use IteratorIterator; |
| 8: | use ReturnTypeWillChange; |
| 9: | use Traversable; |
| 10: | |
| 11: | /** |
| 12: | * Iterates over an iterator, applying a callback to values as they are returned |
| 13: | * |
| 14: | * @api |
| 15: | * |
| 16: | * @template TKey |
| 17: | * @template TInput |
| 18: | * @template TOutput |
| 19: | * |
| 20: | * @extends IteratorIterator<TKey,TOutput,Traversable<TKey,TInput>> |
| 21: | */ |
| 22: | class MapIterator extends IteratorIterator |
| 23: | { |
| 24: | /** @var Closure(TInput, TKey, Traversable<TKey,TInput>): TOutput */ |
| 25: | private Closure $Callback; |
| 26: | |
| 27: | /** |
| 28: | * @param Traversable<TKey,TInput> $iterator |
| 29: | * @param callable(TInput, TKey, Traversable<TKey,TInput>): TOutput $callback |
| 30: | */ |
| 31: | public function __construct(Traversable $iterator, callable $callback) |
| 32: | { |
| 33: | $this->Callback = Get::closure($callback); |
| 34: | |
| 35: | parent::__construct($iterator); |
| 36: | } |
| 37: | |
| 38: | /** |
| 39: | * @return TOutput |
| 40: | * @disregard P1038 |
| 41: | */ |
| 42: | #[ReturnTypeWillChange] |
| 43: | public function current() |
| 44: | { |
| 45: | /** @var TInput */ |
| 46: | $current = parent::current(); |
| 47: | return ($this->Callback)($current, $this->key(), $this); |
| 48: | } |
| 49: | } |
| 50: |