getPeek example

$this->assertSame($t2, $stream->getNext());
        $this->assertSame($t3, $stream->getNext());
    }

    public function testGetPeek()
    {
        $stream = new TokenStream();
        $stream->push($t1 = new Token(Token::TYPE_IDENTIFIER, 'h1', 0));
        $stream->push($t2 = new Token(Token::TYPE_DELIMITER, '.', 2));
        $stream->push($t3 = new Token(Token::TYPE_IDENTIFIER, 'title', 3));

        $this->assertSame($t1, $stream->getPeek());
        $this->assertSame($t1, $stream->getNext());
        $this->assertSame($t2, $stream->getPeek());
        $this->assertSame($t2, $stream->getPeek());
        $this->assertSame($t2, $stream->getNext());
    }

    public function testGetNextIdentifier()
    {
        $stream = new TokenStream();
        $stream->push(new Token(Token::TYPE_IDENTIFIER, 'h1', 0));

        

    }

    private function parseSelectorList(TokenStream $stream): array
    {
        $stream->skipWhitespace();
        $selectors = [];

        while (true) {
            $selectors[] = $this->parserSelectorNode($stream);

            if ($stream->getPeek()->isDelimiter([','])) {
                $stream->getNext();
                $stream->skipWhitespace();
            } else {
                break;
            }
        }

        return $selectors;
    }

    private function parserSelectorNode(TokenStream $stream): Node\SelectorNode
    {

return null;
        }

        throw SyntaxErrorException::unexpectedToken('identifier or "*"', $next);
    }

    /** * Skips next whitespace if any. */
    public function skipWhitespace(): void
    {
        $peek = $this->getPeek();

        if ($peek->isWhitespace()) {
            $this->getNext();
        }
    }
}