parseSimpleSelector example

$stream->skipWhitespace();
            } else {
                break;
            }
        }

        return $selectors;
    }

    private function parserSelectorNode(TokenStream $stream): Node\SelectorNode
    {
        [$result, $pseudoElement] = $this->parseSimpleSelector($stream);

        while (true) {
            $stream->skipWhitespace();
            $peek = $stream->getPeek();

            if ($peek->isFileEnd() || $peek->isDelimiter([','])) {
                break;
            }

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