def read(self):
        """Read a text format DNS message and build a dns.message.Message
        object."""

        line_method = self._header_line
        section = None
        while 1:
            token = self.tok.get(True, True)
            if token.is_eol_or_eof():
                break
            if token.is_comment():
                u = token.value.upper()
                if u == 'HEADER':
                    line_method = self._header_line
                elif u == 'QUESTION' or u == 'ZONE':
                    line_method = self._question_line
                    section = self.message.question
                elif u == 'ANSWER' or u == 'PREREQ':
                    line_method = self._rr_line
                    section = self.message.answer
                elif u == 'AUTHORITY' or u == 'UPDATE':
                    line_method = self._rr_line
                    section = self.message.authority
                elif u == 'ADDITIONAL':
                    line_method = self._rr_line
                    section = self.message.additional
                self.tok.get_eol()
                continue
            self.tok.unget(token)
            line_method(section)
Read a text format DNS message and build a dns.message.Message
        object.