for the next batch.  If there
            # were no strings inside _(), then just ignore this entry.
            if self.__data:
                self.__addentry(EMPTYSTRING.join(self.__data))
            self.__state = self.__waiting
        elif ttype == tokenize.STRING and is_literal_string(tstring):
            self.__data.append(safe_eval(tstring))
        elif ttype not in [tokenize.COMMENT, token.INDENT, token.DEDENT,
                           token.NEWLINE, tokenize.NL]:
            # warn if we see anything else than STRING or whitespace
            print(_(
                '*** %(file)s:%(lineno)s: Seen unexpected token "%(token)s"'
                ) % {
                'token': tstring,
                'file': self.__curfile,
                'lineno': self.__lineno
                }, file=sys.stderr)
            self.__state = self.__waiting

    def __addentry(self, msg, lineno=None, isdocstring=0):
        if lineno is None:
            lineno = self.__lineno
        if not msg in self.__options.toexclude:
            entry = (self.__curfile, lineno)
            self.__messages.setdefault(msg, {})[entry] = isdocstring

    def set_filename(self, filename):
        self.__curfile = filename
        self.__freshmodule = 1

    def write(self, fp):
        options = self.__options
        timestamp = time.strftime('%Y-%m-%d %H:%M%z')
        encoding = fp.encoding if fp.encoding else 'UTF-8'
        print(pot_header % {'time': timestamp, 'version': __version__,
                            'charset': encoding,
                            'encoding': '8bit'}, file=fp)
        # Sort the entries.  First sort each particular entry's keys, then
        # sort all the entries by their first item.
        reverse = {}
        for k, v in self.__messages.items():
            keys = sorted(v.keys())
            reverse.setdefault(tuple(keys), []).append((k, v))
        rkeys = sorted(reverse.keys())
        for rkey in rkeys:
            rentries = reverse[rkey]
            rentries.sort()
            for k, v in rentries:
                # If the entry was gleaned out of a docstring, then add a
                # comment stating so.  This is to aid translators who may wish
                # to skip translating some unimportant docstrings.
                isdocstring = any(v.values())
                # k is the message string, v is a dictionary-set of (filename,
                # lineno) tuples.  We want to sort the entries in v first by
                # file name and then by line number.
                v = sorted(v.keys())
                if not options.writelocations:
                    pass
                # location comments are different b/w Solaris and GNU:
                elif options.locationstyle == options.SOLARIS:
                    for filename, lineno in v:
                        d = {'filename': filename, 'lineno': lineno}
                        print(_(
                            '# File: %(filename)s, line: %(lineno)d') % d, file=fp)
                elif options.locationstyle == options.GNU:
                    # fit as many locations on one line, as long as the
                    # resulting line length doesn't exceed 'options.width'
                    locline = '#:'
                    for filename, lineno in v:
                        d = {'filename': filename, 'lineno': lineno}
                        s = _(' %(filename)s:%(lineno)d') % d
                        if len(locline) + len(s) <= options.width:
                            locline = locline + s
                        else:
                            print(locline, file=fp)
                            locline = "#:" + s
                    if len(locline) > 2:
                        print(locline, file=fp)
                if isdocstring:
                    print('#, docstring', file=fp)
                print('msgid', normalize(k, encoding), file=fp)
                print('msgstr ""\n', file=fp)