def _rr_line(self):
        """Process one line from a DNS master file."""
        # Name
        if self.current_origin is None:
            raise UnknownOrigin
        token = self.tok.get(want_leading = True)
        if not token.is_whitespace():
            self.last_name = dns.name.from_text(token.value, self.current_origin)
        else:
            token = self.tok.get()
            if token.is_eol_or_eof():
                # treat leading WS followed by EOL/EOF as if they were EOL/EOF.
                return
            self.tok.unget(token)
        name = self.last_name
        if not name.is_subdomain(self.zone.origin):
            self._eat_line()
            return
        if self.relativize:
            name = name.relativize(self.zone.origin)
        token = self.tok.get()
        if not token.is_identifier():
            raise dns.exception.SyntaxError
        # TTL
        try:
            ttl = dns.ttl.from_text(token.value)
            token = self.tok.get()
            if not token.is_identifier():
                raise dns.exception.SyntaxError
        except dns.ttl.BadTTL:
            ttl = self.ttl
        # Class
        try:
            rdclass = dns.rdataclass.from_text(token.value)
            token = self.tok.get()
            if not token.is_identifier():
                raise dns.exception.SyntaxError
        except dns.exception.SyntaxError:
            raise dns.exception.SyntaxError
        except:
            rdclass = self.zone.rdclass
        if rdclass != self.zone.rdclass:
            raise dns.exception.SyntaxError("RR class is not zone's class")
        # Type
        try:
            rdtype = dns.rdatatype.from_text(token.value)
        except:
            raise dns.exception.SyntaxError(token.value % "unknown rdatatype '%s'")
        n = self.zone.nodes.get(name)
        if n is None:
            n = self.zone.node_factory()
            self.zone.nodes[name] = n
        try:
            rd = dns.rdata.from_text(rdclass, rdtype, self.tok,
                                     self.current_origin, False)
        except dns.exception.SyntaxError:
            # Catch and reraise.
            (ty, va) = sys.exc_info()[:2]
            raise va
        except:
            # All exceptions that occur in the processing of rdata
            # are treated as syntax errors.  This is not strictly
            # correct, but it is correct almost all of the time.
            # We convert them to syntax errors so that we can emit
            # helpful filename:line info.
            (ty, va) = sys.exc_info()[:2]
            raise dns.exception.SyntaxError("caught exception %s: %s" % (str(ty), str(va)))

        rd.choose_relativity(self.zone.origin, self.relativize)
        covers = rd.covers()
        rds = n.find_rdataset(rdclass, rdtype, covers, True)
        rds.add(rd, ttl)
dataset/ETHPy150Open catap/namebench/nb_third_party/dns/zone.py/_MasterReader._rr_line/swapped operands of `%`