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Merge pull request #23 from macocci7/dev_1.1.0
Update fromArrays() to return Iterator
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| <?php | ||
|
|
||
| namespace Macocci7\PhpCombination; | ||
|
|
||
| /** | ||
| * Class for generating combinations with Iterator. | ||
| * | ||
| * @implements \Iterator<int, mixed> | ||
| * @author macocci7 <[email protected]> | ||
| * @license MIT | ||
| */ | ||
| class CombinationIterator implements \Iterator | ||
| { | ||
| /** | ||
| * @var mixed[] $arrays | ||
| */ | ||
| private array $arrays; | ||
|
|
||
| /** | ||
| * @var int[]|null $pointers | ||
| */ | ||
| private array|null $pointers = null; | ||
|
|
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| /** | ||
| * @var int $key | ||
| */ | ||
| private int $key; | ||
|
|
||
| /** | ||
| * constructor | ||
| * | ||
| * @param array<array<int, mixed[]>> $arrays | ||
| */ | ||
| public function __construct(array $arrays) | ||
| { | ||
| $this->arrays = $arrays; | ||
| $this->pointers = array_fill(0, count($arrays), 0); | ||
| $this->key = 0; | ||
| } | ||
|
|
||
| /** | ||
| * returns current element | ||
| * | ||
| * @return mixed | ||
| */ | ||
| public function current(): mixed | ||
| { | ||
| $result = []; | ||
| foreach ($this->pointers as $arrayIndex => $elementIndex) { | ||
| $result[] = $this->arrays[$arrayIndex][$elementIndex] ?? null; | ||
| } | ||
| return $result; | ||
| } | ||
|
|
||
| /** | ||
| * returns current key. | ||
| * | ||
| * @return int | ||
| */ | ||
| public function key(): int | ||
| { | ||
| return $this->key; | ||
| } | ||
|
|
||
| /** | ||
| * advances the pointer one step. | ||
| */ | ||
| public function next(): void | ||
| { | ||
| for ($i = count($this->pointers) - 1; $i >= 0; $i--) { | ||
| if ($this->pointers[$i] < count($this->arrays[$i]) - 1) { | ||
| $this->pointers[$i]++; | ||
| // 繰り上げた位より下位の位をゼロにセット | ||
| // 1199 + 1 = 1200 | ||
| // ^ ^^ | ||
| $count = count($this->pointers); | ||
| for ($j = $i + 1; $j < $count; $j++) { | ||
| $this->pointers[$j] = 0; | ||
| } | ||
| $this->key++; | ||
| return; | ||
| } | ||
| } | ||
| $this->pointers = null; | ||
| } | ||
|
|
||
| /** | ||
| * rewinds the pointers and the key. | ||
| * | ||
| * @return void | ||
| */ | ||
| public function rewind(): void | ||
| { | ||
| $this->pointers = array_fill(0, count($this->arrays), 0); | ||
| $this->key = 0; | ||
| } | ||
|
|
||
| /** | ||
| * returns if the pointers are valid. | ||
| * | ||
| * @return bool | ||
| */ | ||
| public function valid(): bool | ||
| { | ||
| return $this->pointers !== null; | ||
| } | ||
| } |
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