i18n_utils.py 文件源码

def __call__(self, environ, start_response):
        """Called by WSGI when a request comes in.

        Args:
            environ: A dict holding environment variables.
            start_response: A WSGI callable (PEP333).

        Returns:
            Application response data as an iterable. It just returns
            the return value of the inner WSGI app.
        """
        req = Request(environ)
        preferred_languages = list(req.accept_language)
        if self.default_language not in preferred_languages:
            preferred_languages.append(self.default_language)
        translation = gettext.translation(
            'messages', self.locale_path, fallback=True,
            languages=preferred_languages, codeset='utf-8')
        translation.install(unicode=True, names=['gettext', 'ngettext'])
        environ['i18n_utils.active_translation'] = translation
        environ['i18n_utils.preferred_languages'] = preferred_languages

        return self.app(environ, start_response)