protected function pointLists()
    {
        $this->match(Lexer::T_OPEN_PARENTHESIS);

        $pointLists = array($this->pointList());

        $this->match(Lexer::T_CLOSE_PARENTHESIS);

        while ($this->lexer->isNextToken(Lexer::T_COMMA)) {
            $this->match(Lexer::T_COMMA);
            $this->match(Lexer::T_OPEN_PARENTHESIS);

            $pointLists[] = $this->pointList();

            $this->match(Lexer::T_CLOSE_PARENTHESIS);
        }

        return $pointLists;
    }