def preprocess(self):
        from django.utils.translation import templatize

        if not self.is_templatized:
            return

        with io.open(self.path, 'r', encoding=settings.FILE_CHARSET) as fp:
            src_data = fp.read()

        if self.domain == 'djangojs':
            content = prepare_js_for_gettext(src_data)
        elif self.domain == 'django':
            content = templatize(src_data, self.path[2:])

        with io.open(self.work_path, 'w', encoding='utf-8') as fp:
            fp.write(content)
Preprocess (if necessary) a translatable file before passing it to
dataset/ETHPy150Open django/django/django/core/management/commands/makemessages.py/BuildFile.preprocess