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<?php |
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declare(strict_types=1); |
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namespace Smoren\ArrayView\Selectors; |
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use Smoren\ArrayView\Interfaces\ArraySelectorInterface; |
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use Smoren\ArrayView\Interfaces\ArrayViewInterface; |
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use Smoren\ArrayView\Structs\Slice; |
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use Smoren\ArrayView\Views\ArraySliceView; |
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/** |
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* Represents a slice selector that selects elements based on the provided slice parameters. |
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* |
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* ```php |
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* $originalArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; |
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* $view = ArrayView::toView($originalArray); |
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* |
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* $selector = new SliceSelector('::2'); |
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* print_r($view[$selector]); // [1, 3, 5, 7, 9] |
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* print_r($view->subview($selector)->toArray()); // [1, 3, 5, 7, 9] |
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* |
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* $selector = new SliceSelector('1::2'); |
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* print_r($view[$selector]); // [2, 4, 6, 8, 10] |
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* print_r($view->subview($selector)->toArray()); // [2, 4, 6, 8, 10] |
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* |
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* $selector = new SliceSelector('-3::-2'); |
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* print_r($view[$selector]); // [8, 6, 4, 2] |
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* print_r($view->subview($selector)->toArray()); // [8, 6, 4, 2] |
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* |
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* $selector = new SliceSelector('1:4'); |
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* print_r($view[$selector]); // [2, 3, 4] |
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* print_r($view->subview($selector)->toArray()); // [2, 3, 4] |
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* |
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* $selector = new SliceSelector('-2:0:-1'); |
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* print_r($view[$selector]); // [9, 8, 7, 6, 5, 4, 3, 2] |
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* print_r($view->subview($selector)->toArray()); // [9, 8, 7, 6, 5, 4, 3, 2] |
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* ``` |
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*/ |
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final class SliceSelector extends Slice implements ArraySelectorInterface |
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{ |
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/** |
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* Creates a new SliceSelector instance with the provided slice parameters. |
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* |
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* @param Slice|string|array<int> $slice The slice instance or slice string defining the selection. |
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*/ |
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public function __construct($slice) |
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{ |
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$s = Slice::toSlice($slice); |
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parent::__construct($s->start, $s->end, $s->step); |
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} |
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/** |
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* Selects elements from the source array based on the slice parameters. |
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* |
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* @template T The type of elements in the source array. |
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* |
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* @param ArrayViewInterface<T> $source The source array to select elements from. |
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* @param bool|null $readonly Whether the selection should be read-only. |
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* |
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* @return ArraySliceView<T> The view containing the selected elements. |
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* |
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* {@inheritDoc} |
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*/ |
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public function select(ArrayViewInterface $source, ?bool $readonly = null): ArrayViewInterface |
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{ |
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return new ArraySliceView($source, $this, $readonly ?? $source->isReadonly()); |
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} |
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/** |
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* Checks if the selector is compatible with the given view. |
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* |
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* @template T View elements type. |
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* |
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* @param ArrayViewInterface<T> $view the view to check compatibility with. |
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* |
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* @return bool true if the element is compatible, false otherwise |
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* |
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* {@inheritDoc} |
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*/ |
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public function compatibleWith(ArrayViewInterface $view): bool |
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{ |
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return true; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function getValue(): Slice |
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{ |
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return $this; |
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} |
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} |
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Smoren /
array-view-php
