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<?php |
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declare(strict_types=1); |
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namespace drupol\phpermutations; |
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use function count; |
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/** |
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* Class Combinatorics. |
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*/ |
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abstract class Combinatorics |
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{ |
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/** |
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* The dataset. |
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* |
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* @var array<int, mixed> |
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*/ |
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protected $dataset; |
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/** |
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* The number of values in the dataset. |
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* |
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* @var int |
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*/ |
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protected $datasetCount; |
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/** |
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* The length. |
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* |
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* @var int |
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*/ |
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protected $length; |
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/** |
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* Combinatorics constructor. |
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* |
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* @param array<int, mixed> $dataset |
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* The dataset |
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* @param int|null $length |
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* The length |
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*/ |
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public function __construct(array $dataset = [], $length = null) |
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{ |
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$this->setDataset($dataset); |
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$this->datasetCount = count($this->dataset); |
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$this->setLength($length); |
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} |
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/** |
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* Count elements of an object. |
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* |
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* @return int |
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* The number of element |
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*/ |
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public function count() |
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{ |
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return count($this->toArray()); |
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} |
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/** |
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* Get the dataset. |
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* |
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* @return mixed[] |
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* The dataset |
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*/ |
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public function getDataset() |
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{ |
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return $this->dataset; |
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} |
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/** |
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* Get the length. |
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* |
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* @return int |
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* The length |
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*/ |
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public function getLength() |
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{ |
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return (int) $this->length; |
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} |
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/** |
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* Set the dataset. |
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* |
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* @param array<int, mixed> $dataset |
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* The dataset |
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* |
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* @return $this |
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*/ |
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public function setDataset(array $dataset = []) |
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{ |
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$this->dataset = $dataset; |
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return $this; |
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} |
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/** |
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* Set the length. |
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* |
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* @param int|null $length |
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* The length |
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* |
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* @return $this |
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*/ |
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public function setLength($length = null) |
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{ |
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$length = $length ?? $this->datasetCount; |
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$this->length = (abs($length) > $this->datasetCount) ? $this->datasetCount : $length; |
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return $this; |
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} |
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/** |
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* @return array<int, mixed> |
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*/ |
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public function toArray() |
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{ |
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return []; |
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} |
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/** |
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* Compute the factorial of an integer. |
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* |
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* @param int $n |
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* The number to get its factorial |
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* @param int $total |
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* The total |
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* |
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* @return int |
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* The factorial of $n |
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*/ |
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protected function fact($n, $total = 1) |
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{ |
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return (2 > $n) ? $total : $this->fact($n - 1, $total * $n); |
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} |
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} |
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drupol /
phpermutations
