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    <h3>Editing: SelectorNode.php</h3>
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/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\CssSelector\Node;

/**
 * Represents a &quot;&lt;selector&gt;(::|:)&lt;pseudoElement&gt;&quot; node.
 *
 * This component is a port of the Python cssselect library,
 * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
 *
 * @author Jean-François Simon &lt;jeanfrancois.simon@sensiolabs.com&gt;
 *
 * @internal
 */
class SelectorNode extends AbstractNode
{
    private $tree;
    private $pseudoElement;

    public function __construct(NodeInterface $tree, ?string $pseudoElement = null)
    {
        $this-&gt;tree = $tree;
        $this-&gt;pseudoElement = $pseudoElement ? strtolower($pseudoElement) : null;
    }

    public function getTree(): NodeInterface
    {
        return $this-&gt;tree;
    }

    public function getPseudoElement(): ?string
    {
        return $this-&gt;pseudoElement;
    }

    /**
     * {@inheritdoc}
     */
    public function getSpecificity(): Specificity
    {
        return $this-&gt;tree-&gt;getSpecificity()-&gt;plus(new Specificity(0, 0, $this-&gt;pseudoElement ? 1 : 0));
    }

    public function __toString(): string
    {
        return sprintf('%s[%s%s]', $this-&gt;getNodeName(), $this-&gt;tree, $this-&gt;pseudoElement ? '::'.$this-&gt;pseudoElement : '');
    }
}
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