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<?php /** * SCSSPHP * * @copyright 2012-2020 Leaf Corcoran * * @license http://opensource.org/licenses/MIT MIT * * @link http://scssphp.github.io/scssphp */ namespace ScssPhp\ScssPhp\Ast\Css; /** * A modifiable version of {@see CssParentNode} for use in the evaluation step. * * @internal */ abstract class ModifiableCssParentNode extends ModifiableCssNode implements CssParentNode { /** * @var list<ModifiableCssNode> */ private array $children; /** * @param list<ModifiableCssNode> $children */ public function __construct(array $children = []) { $this->children = $children; } /** * @return list<ModifiableCssNode> */ public function getChildren(): array { return $this->children; } public function isChildless(): bool { return false; } /** * Returns whether $this is equal to $other, ignoring their child nodes. */ abstract public function equalsIgnoringChildren(ModifiableCssNode $other): bool; /** * Returns a copy of $this with an empty {@see children} list. * * This is *not* a deep copy. If other parts of this node are modifiable, * they are shared between the new and old nodes. */ abstract public function copyWithoutChildren(): ModifiableCssParentNode; public function addChild(ModifiableCssNode $child): void { $child->setParent($this, \count($this->children)); $this->children[] = $child; } /** * @internal */ public function removeChildAt(int $index): void { array_splice($this->children, $index, 1); } /** * Destructively removes all elements from {@see children}. */ public function clearChildren(): void { foreach ($this->children as $child) { $child->resetParentReferences(); } $this->children = []; } }
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