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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\Selector;
use ScssPhp\ScssPhp\Visitor\SelectorVisitor;
/**
* An ID selector.
*
* This selects elements whose `id` attribute exactly matches the given name.
*/
final class IDSelector extends SimpleSelector
{
/**
* The ID name this selects for.
*
* @var string
* @readonly
*/
private $name;
public function __construct(string $name)
{
$this->name = $name;
}
public function getName(): string
{
return $this->name;
}
public function getSpecificity(): int
{
return parent::getSpecificity() ** 2;
}
public function accept(SelectorVisitor $visitor)
{
return $visitor->visitIDSelector($this);
}
public function addSuffix(string $suffix): SimpleSelector
{
return new IDSelector($this->name . $suffix);
}
public function unify(array $compound): ?array
{
// A given compound selector may only contain one ID.
foreach ($compound as $simple) {
if ($simple instanceof IDSelector && !$simple->equals($this)) {
return null;
}
}
return parent::unify($compound);
}
public function equals(object $other): bool
{
return $other instanceof IDSelector && $other->name === $this->name;
}
}
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