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<?php |
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declare(strict_types=1); |
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namespace drupol\phpermutations\Iterators; |
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use ArrayIterator; |
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use drupol\phpermutations\Iterators; |
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use Iterator; |
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use function count; |
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class Product extends Iterators |
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{ |
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/** |
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* The iterators. |
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* |
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* @var Iterator[] |
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*/ |
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protected $iterators = []; |
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/** |
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* Product constructor. |
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* |
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* @param array<int, mixed> $datasetArray |
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* The array of dataset |
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*/ |
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public function __construct(array $datasetArray) |
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{ |
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parent::__construct($datasetArray); |
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foreach ($datasetArray as $dataset) { |
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$this->iterators[] = new ArrayIterator($dataset); |
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} |
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$this->key = 0; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function count(): int |
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{ |
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$product = 1; |
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foreach ($this->getDataset() as $dataset) { |
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$product *= count($dataset); |
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} |
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return $product; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function current(): mixed |
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{ |
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$tuple = []; |
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foreach ($this->iterators as $iterator) { |
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$tuple[] = $iterator->current(); |
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} |
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return $tuple; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @return void |
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*/ |
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public function next(): void |
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{ |
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foreach (array_reverse($this->iterators) as $key => $iterator) { |
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$iterator->next(); |
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if ($iterator->valid()) { |
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$count_iterators = count($this->iterators); |
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foreach ($this->iterators as $key2 => $iterator2) { |
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if ($count_iterators - $key2 <= $key) { |
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$iterator2->rewind(); |
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} |
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} |
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break; |
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} |
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} |
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++$this->key; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @return void |
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*/ |
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public function rewind(): void |
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{ |
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foreach ($this->iterators as $iterator) { |
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$iterator->rewind(); |
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} |
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$this->key = 0; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @return bool |
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*/ |
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public function valid(): bool |
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{ |
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$isUnlessOneValid = false; |
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foreach ($this->iterators as $iterator) { |
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if ($iterator->valid()) { |
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$isUnlessOneValid = true; |
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} |
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} |
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return $isUnlessOneValid; |
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} |
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} |
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drupol /
phpermutations
