HashNode example

|| $peek->isDelimiter([',', '+', '>', '~'])
                || ($insideNegation && $peek->isDelimiter([')']))
            ) {
                break;
            }

            if (null !== $pseudoElement) {
                throw SyntaxErrorException::pseudoElementFound($pseudoElement, 'not at the end of a selector');
            }

            if ($peek->isHash()) {
                $result = new Node\HashNode($result, $stream->getNext()->getValue());
            } elseif ($peek->isDelimiter(['.'])) {
                $stream->getNext();
                $result = new Node\ClassNode($result, $stream->getNextIdentifier());
            } elseif ($peek->isDelimiter(['['])) {
                $stream->getNext();
                $result = $this->parseAttributeNode($result, $stream);
            } elseif ($peek->isDelimiter([':'])) {
                $stream->getNext();

                if ($stream->getPeek()->isDelimiter([':'])) {
                    $stream->getNext();
                    

namespace Symfony\Component\CssSelector\Tests\Node;

use Symfony\Component\CssSelector\Node\ElementNode;
use Symfony\Component\CssSelector\Node\HashNode;

class HashNodeTest extends AbstractNodeTestCase
{
    public static function getToStringConversionTestData()
    {
        return [
            [new HashNode(new ElementNode(), 'id'), 'Hash[Element[*]#id]'],
        ];
    }

    public static function getSpecificityValueTestData()
    {
        return [
            [new HashNode(new ElementNode(), 'id'), 100],
            [new HashNode(new ElementNode(null, 'id'), 'class'), 101],
        ];
    }
}

public function parse(string $source): array
    {
        // Matches an optional namespace, optional element, and required id         // $source = 'test|input#ab6bd_field';         // $matches = array (size=4)         // 0 => string 'test|input#ab6bd_field' (length=22)         // 1 => string 'test' (length=4)         // 2 => string 'input' (length=5)         // 3 => string 'ab6bd_field' (length=11)         if (preg_match('/^(?:([a-z]++)\|)?+([\w-]++|\*)?+#([\w-]++)$/i', trim($source), $matches)) {
            return [
                new SelectorNode(new HashNode(new ElementNode($matches[1] ?: null, $matches[2] ?: null), $matches[3])),
            ];
        }

        return [];
    }
}