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<?php |
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declare(strict_types=1); |
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namespace Arrayy; |
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/** |
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* @internal |
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*/ |
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final class ArrayyRewindableGenerator implements \Iterator |
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{ |
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/** |
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* @var callable |
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*/ |
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private $generatorFunction; |
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/** |
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* @var \Generator |
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*/ |
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private $generator; |
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/** |
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* @var callable|null |
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*/ |
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private $onRewind; |
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/** |
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* @param callable $generatorConstructionFunction A callable that should return a Generator |
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* @param callable $onRewind callable that gets invoked with 0 arguments after the iterator |
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* was rewinded |
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* |
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* @throws \InvalidArgumentException |
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*/ |
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public function __construct(callable $generatorConstructionFunction, callable $onRewind = null) |
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{ |
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$this->generatorFunction = $generatorConstructionFunction; |
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$this->onRewind = $onRewind; |
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$this->generateGenerator(); |
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} |
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private function generateGenerator() |
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{ |
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$this->generator = call_user_func($this->generatorFunction); |
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if (!($this->generator instanceof \Generator)) { |
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throw new \InvalidArgumentException('The callable needs to return a Generator'); |
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} |
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} |
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/** |
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* Return the current element. |
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* |
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* @return mixed |
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* @link http://php.net/manual/en/iterator.current.php |
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* @see Iterator::current |
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*/ |
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public function current() |
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{ |
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return $this->generator->current(); |
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} |
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/** |
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* Move forward to next element. |
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* |
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* @see Iterator::next |
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* @link http://php.net/manual/en/iterator.next.php |
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*/ |
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public function next() |
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{ |
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$this->generator->next(); |
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} |
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/** |
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* Return the key of the current element. |
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* |
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* @return mixed scalar on success, or null on failure. |
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* @link http://php.net/manual/en/iterator.key.php |
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* @see Iterator::key |
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*/ |
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public function key() |
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{ |
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return $this->generator->key(); |
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} |
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/** |
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* Checks if current position is valid. |
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* |
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* @return boolean |
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* @link http://php.net/manual/en/iterator.valid.php |
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* @see Iterator::rewind |
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*/ |
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public function valid() |
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{ |
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return $this->generator->valid(); |
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} |
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/** |
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* Rewind the Iterator to the first element. |
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* |
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* @see Iterator::rewind |
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* @link http://php.net/manual/en/iterator.rewind.php |
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*/ |
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public function rewind() |
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{ |
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$this->generateGenerator(); |
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if (is_callable($this->onRewind)) { |
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call_user_func($this->onRewind); |
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} |
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} |
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} |
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voku /
Arrayy
