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<?php |
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namespace drupol\phpermutations\Iterators; |
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use drupol\phpermutations\Combinatorics; |
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/** |
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* Class Combinations. |
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* |
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* @package drupol\phpermutations\Iterators |
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*/ |
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class Combinations extends Combinatorics implements \Iterator { |
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/** |
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* The values. |
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* |
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* @var array |
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*/ |
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protected $c = array(); |
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/** |
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* The key. |
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* |
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* @var int |
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*/ |
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protected $key = 0; |
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/** |
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* Combinations constructor. |
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* |
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* @param array $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 = array(), $length = NULL) { |
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parent::__construct(array_values($dataset), $length); |
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$this->rewind(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function key() { |
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return $this->key; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function current() { |
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$r = array(); |
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for ($i = 0; $i < $this->length; $i++) { |
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$r[] = $this->dataset[$this->c[$i]]; |
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} |
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return $r; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function next() { |
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if ($this->nextHelper()) { |
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$this->key++; |
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} |
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else { |
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$this->key = -1; |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function rewind() { |
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$this->c = range(0, $this->length); |
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$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 valid() { |
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return $this->key >= 0; |
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} |
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/** |
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* Custom next() callback. |
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* |
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* @return bool |
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* Return true or false. |
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*/ |
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protected function nextHelper() { |
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$i = $this->length - 1; |
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while ($i >= 0 && $this->c[$i] == $this->datasetCount - $this->length + $i) { |
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$i--; |
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} |
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if ($i < 0) { |
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return FALSE; |
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} |
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$this->c[$i]++; |
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while ($i++ < $this->length - 1) { |
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$this->c[$i] = $this->c[$i - 1] + 1; |
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} |
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return TRUE; |
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} |
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/** |
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* Convert the iterator into an array. |
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* |
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* @return array |
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* The elements. |
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*/ |
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3 |
View Code Duplication |
public function toArray() { |
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$data = []; |
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for ($this->rewind(); $this->valid(); $this->next()) { |
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$data[] = $this->current(); |
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} |
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return $data; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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6 |
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public function count() { |
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return $this->fact(count($this->getDataset())) / ($this->fact($this->getLength()) * $this->fact(count($this->getDataset()) - $this->getLength())); |
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} |
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} |
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drupol /
phpermutations
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