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<?php namespace ScssPhp\ScssPhp\Visitor; use ScssPhp\ScssPhp\Ast\Selector\AttributeSelector; use ScssPhp\ScssPhp\Ast\Selector\ClassSelector; use ScssPhp\ScssPhp\Ast\Selector\ComplexSelector; use ScssPhp\ScssPhp\Ast\Selector\ComplexSelectorComponent; use ScssPhp\ScssPhp\Ast\Selector\CompoundSelector; use ScssPhp\ScssPhp\Ast\Selector\IDSelector; use ScssPhp\ScssPhp\Ast\Selector\ParentSelector; use ScssPhp\ScssPhp\Ast\Selector\PlaceholderSelector; use ScssPhp\ScssPhp\Ast\Selector\PseudoSelector; use ScssPhp\ScssPhp\Ast\Selector\SelectorList; use ScssPhp\ScssPhp\Ast\Selector\SimpleSelector; use ScssPhp\ScssPhp\Ast\Selector\TypeSelector; use ScssPhp\ScssPhp\Ast\Selector\UniversalSelector; use ScssPhp\ScssPhp\Util\IterableUtil; /** * A {@see SelectorVisitor} whose `visit*` methods default to returning `null`, but * which returns the first non-`null` value returned by any method. * * This can be extended to find the first instance of particular nodes in the * AST. * * @template T * @template-implements SelectorVisitor<T|null> * * @internal */ abstract class SelectorSearchVisitor implements SelectorVisitor { public function visitAttributeSelector(AttributeSelector $attribute) { return null; } public function visitClassSelector(ClassSelector $klass) { return null; } public function visitIDSelector(IDSelector $id) { return null; } public function visitParentSelector(ParentSelector $parent) { return null; } public function visitPlaceholderSelector(PlaceholderSelector $placeholder) { return null; } public function visitTypeSelector(TypeSelector $type) { return null; } public function visitUniversalSelector(UniversalSelector $universal) { return null; } public function visitComplexSelector(ComplexSelector $complex) { return IterableUtil::search($complex->getComponents(), fn(ComplexSelectorComponent $component) => $this->visitCompoundSelector($component->getSelector())); } public function visitCompoundSelector(CompoundSelector $compound) { return IterableUtil::search($compound->getComponents(), fn(SimpleSelector $simple) => $simple->accept($this)); } public function visitPseudoSelector(PseudoSelector $pseudo) { if ($pseudo->getSelector() !== null) { return $this->visitSelectorList($pseudo->getSelector()); } return null; } public function visitSelectorList(SelectorList $list) { return IterableUtil::search($list->getComponents(), $this->visitComplexSelector(...)); } }
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