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<?php |
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/** |
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* @author Maxim Sokolovsky |
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*/ |
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namespace WS\Utils\Collections\Functions; |
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use Closure; |
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use WS\Utils\Collections\ArrayList; |
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use WS\Utils\Collections\Collection; |
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class Reorganizers |
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{ |
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private static function collectionConstructor(? array $elements = null): Collection { |
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return new ArrayList($elements); |
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} |
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/** |
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* Returns <Fn($c: Collection): Collection> that shuffles elements |
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* @return Closure |
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*/ |
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public static function shuffle(): Closure |
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{ |
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return static function (Collection $collection): Collection { |
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$array = $collection->toArray(); |
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shuffle($array); |
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return self::collectionConstructor($array); |
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}; |
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} |
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/** |
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* Returns Closure <Fn($c: Collection): Collection> that gets $count random elements from collection |
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* @param int $count |
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* @return Closure |
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*/ |
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public static function random(int $count = 1): Closure |
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{ |
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return static function (Collection $collection) use ($count): Collection { |
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/** |
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* Collection |
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*/ |
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$resultCollection = self::collectionConstructor(); |
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if ($count === 0) { |
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return $resultCollection; |
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} |
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$collectionSize = $collection->size(); |
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$expectedCount = $count; |
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if ($collectionSize < $expectedCount) { |
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return $resultCollection; |
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} |
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$rest = $collectionSize; |
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$generated = 0; |
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$multiplicity = (int)round($collectionSize / $expectedCount); |
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$rangeRandomizer = static function () use ($multiplicity): int { |
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return random_int(0, $multiplicity - 1); |
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}; |
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$trier = static function () use (& $generated, & $rest, $expectedCount, $rangeRandomizer): bool { |
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$rest--; |
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if ($generated === $expectedCount) { |
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return false; |
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} |
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if ($generated + $rest + 1 <= $expectedCount) { |
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return true; |
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} |
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if ($rangeRandomizer() !== 0) { |
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return false; |
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} |
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$generated++; |
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return true; |
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}; |
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return $collection |
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->stream() |
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->filter($trier) |
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->getCollection(); |
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}; |
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} |
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/** |
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* Returns Closure <Fn($c: Collection): Collection> that split collection into sub collections with $size |
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* @param int $size |
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* @return Closure |
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*/ |
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public static function chunk(int $size): Closure |
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{ |
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return static function (Collection $collection) use ($size): Collection { |
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$chunkCollection = self::collectionConstructor(); |
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$currentChunk = self::collectionConstructor(); |
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$pointer = $size; |
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$collection |
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->stream() |
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->each(static function ($el) use ($size, $chunkCollection, & $currentChunk, & $pointer) { |
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$pointer--; |
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$currentChunk->add($el); |
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if ($pointer === 0) { |
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$chunkCollection->add($currentChunk); |
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$currentChunk = self::collectionConstructor(); |
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$pointer = $size; |
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} |
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}) |
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; |
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return $chunkCollection; |
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}; |
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} |
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/** |
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* Returns Closure <Fn($c: Collection): Collection> that collapses a collection of arrays into a single, flat collection |
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* @return Closure |
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*/ |
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public static function collapse(): Closure |
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{ |
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return static function (Collection $collection): Collection { |
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$flatIterable = static function (iterable $collection) use (& $flatIterable): array { |
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$res = []; |
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foreach ($collection as $item) { |
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if (is_iterable($item)) { |
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$toPush = $flatIterable($item); |
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array_unshift($toPush, $res); |
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array_push(...$toPush); |
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$res = array_shift($toPush); |
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} else { |
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$res[] = $item; |
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} |
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} |
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return $res; |
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}; |
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return self::collectionConstructor($flatIterable($collection)); |
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1 |
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}; |
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} |
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} |
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worksolutions /
php-collections
