diff options
Diffstat (limited to 'openstackclient')
| -rw-r--r-- | openstackclient/openstack/common/gettextutils.py | 198 |
1 files changed, 152 insertions, 46 deletions
diff --git a/openstackclient/openstack/common/gettextutils.py b/openstackclient/openstack/common/gettextutils.py index 2dd5449e..d4c93f4a 100644 --- a/openstackclient/openstack/common/gettextutils.py +++ b/openstackclient/openstack/common/gettextutils.py @@ -1,8 +1,8 @@ # vim: tabstop=4 shiftwidth=4 softtabstop=4 # Copyright 2012 Red Hat, Inc. -# All Rights Reserved. # Copyright 2013 IBM Corp. +# All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); you may # not use this file except in compliance with the License. You may obtain @@ -26,22 +26,46 @@ Usual usage in an openstack.common module: import copy import gettext -import logging.handlers +import logging import os import re -import UserString +try: + import UserString as _userString +except ImportError: + import collections as _userString +from babel import localedata import six _localedir = os.environ.get('openstackclient'.upper() + '_LOCALEDIR') _t = gettext.translation('openstackclient', localedir=_localedir, fallback=True) +_AVAILABLE_LANGUAGES = {} +USE_LAZY = False + + +def enable_lazy(): + """Convenience function for configuring _() to use lazy gettext + + Call this at the start of execution to enable the gettextutils._ + function to use lazy gettext functionality. This is useful if + your project is importing _ directly instead of using the + gettextutils.install() way of importing the _ function. + """ + global USE_LAZY + USE_LAZY = True + def _(msg): - return _t.ugettext(msg) + if USE_LAZY: + return Message(msg, 'openstackclient') + else: + if six.PY3: + return _t.gettext(msg) + return _t.ugettext(msg) -def install(domain): +def install(domain, lazy=False): """Install a _() function using the given translation domain. Given a translation domain, install a _() function using gettext's @@ -51,52 +75,60 @@ def install(domain): overriding the default localedir (e.g. /usr/share/locale) using a translation-domain-specific environment variable (e.g. NOVA_LOCALEDIR). - """ - gettext.install(domain, - localedir=os.environ.get(domain.upper() + '_LOCALEDIR'), - unicode=True) - - -""" -Lazy gettext functionality. - -The following is an attempt to introduce a deferred way -to do translations on messages in OpenStack. We attempt to -override the standard _() function and % (format string) operation -to build Message objects that can later be translated when we have -more information. Also included is an example LogHandler that -translates Messages to an associated locale, effectively allowing -many logs, each with their own locale. -""" - - -def get_lazy_gettext(domain): - """Assemble and return a lazy gettext function for a given domain. - Factory method for a project/module to get a lazy gettext function - for its own translation domain (i.e. nova, glance, cinder, etc.) + :param domain: the translation domain + :param lazy: indicates whether or not to install the lazy _() function. + The lazy _() introduces a way to do deferred translation + of messages by installing a _ that builds Message objects, + instead of strings, which can then be lazily translated into + any available locale. """ - - def _lazy_gettext(msg): - """Create and return a Message object. - - Message encapsulates a string so that we can translate it later when - needed. - """ - return Message(msg, domain) - - return _lazy_gettext + if lazy: + # NOTE(mrodden): Lazy gettext functionality. + # + # The following introduces a deferred way to do translations on + # messages in OpenStack. We override the standard _() function + # and % (format string) operation to build Message objects that can + # later be translated when we have more information. + # + # Also included below is an example LocaleHandler that translates + # Messages to an associated locale, effectively allowing many logs, + # each with their own locale. + + def _lazy_gettext(msg): + """Create and return a Message object. + + Lazy gettext function for a given domain, it is a factory method + for a project/module to get a lazy gettext function for its own + translation domain (i.e. nova, glance, cinder, etc.) + + Message encapsulates a string so that we can translate + it later when needed. + """ + return Message(msg, domain) + + from six import moves + moves.builtins.__dict__['_'] = _lazy_gettext + else: + localedir = '%s_LOCALEDIR' % domain.upper() + if six.PY3: + gettext.install(domain, + localedir=os.environ.get(localedir)) + else: + gettext.install(domain, + localedir=os.environ.get(localedir), + unicode=True) -class Message(UserString.UserString, object): +class Message(_userString.UserString, object): """Class used to encapsulate translatable messages.""" def __init__(self, msg, domain): # _msg is the gettext msgid and should never change self._msg = msg self._left_extra_msg = '' self._right_extra_msg = '' + self._locale = None self.params = None - self.locale = None self.domain = domain @property @@ -116,8 +148,13 @@ class Message(UserString.UserString, object): localedir=localedir, fallback=True) + if six.PY3: + ugettext = lang.gettext + else: + ugettext = lang.ugettext + full_msg = (self._left_extra_msg + - lang.ugettext(self._msg) + + ugettext(self._msg) + self._right_extra_msg) if self.params is not None: @@ -125,12 +162,39 @@ class Message(UserString.UserString, object): return six.text_type(full_msg) + @property + def locale(self): + return self._locale + + @locale.setter + def locale(self, value): + self._locale = value + if not self.params: + return + + # This Message object may have been constructed with one or more + # Message objects as substitution parameters, given as a single + # Message, or a tuple or Map containing some, so when setting the + # locale for this Message we need to set it for those Messages too. + if isinstance(self.params, Message): + self.params.locale = value + return + if isinstance(self.params, tuple): + for param in self.params: + if isinstance(param, Message): + param.locale = value + return + if isinstance(self.params, dict): + for param in self.params.values(): + if isinstance(param, Message): + param.locale = value + def _save_dictionary_parameter(self, dict_param): full_msg = self.data # look for %(blah) fields in string; # ignore %% and deal with the # case where % is first character on the line - keys = re.findall('(?:[^%]|^)%\((\w*)\)[a-z]', full_msg) + keys = re.findall('(?:[^%]|^)?%\((\w*)\)[a-z]', full_msg) # if we don't find any %(blah) blocks but have a %s if not keys and re.findall('(?:[^%]|^)%[a-z]', full_msg): @@ -143,7 +207,7 @@ class Message(UserString.UserString, object): params[key] = copy.deepcopy(dict_param[key]) except TypeError: # cast uncopyable thing to unicode string - params[key] = unicode(dict_param[key]) + params[key] = six.text_type(dict_param[key]) return params @@ -162,7 +226,7 @@ class Message(UserString.UserString, object): try: self.params = copy.deepcopy(other) except TypeError: - self.params = unicode(other) + self.params = six.text_type(other) return self @@ -171,11 +235,13 @@ class Message(UserString.UserString, object): return self.data def __str__(self): + if six.PY3: + return self.__unicode__() return self.data.encode('utf-8') def __getstate__(self): to_copy = ['_msg', '_right_extra_msg', '_left_extra_msg', - 'domain', 'params', 'locale'] + 'domain', 'params', '_locale'] new_dict = self.__dict__.fromkeys(to_copy) for attr in to_copy: new_dict[attr] = copy.deepcopy(self.__dict__[attr]) @@ -229,7 +295,47 @@ class Message(UserString.UserString, object): if name in ops: return getattr(self.data, name) else: - return UserString.UserString.__getattribute__(self, name) + return _userString.UserString.__getattribute__(self, name) + + +def get_available_languages(domain): + """Lists the available languages for the given translation domain. + + :param domain: the domain to get languages for + """ + if domain in _AVAILABLE_LANGUAGES: + return copy.copy(_AVAILABLE_LANGUAGES[domain]) + + localedir = '%s_LOCALEDIR' % domain.upper() + find = lambda x: gettext.find(domain, + localedir=os.environ.get(localedir), + languages=[x]) + + # NOTE(mrodden): en_US should always be available (and first in case + # order matters) since our in-line message strings are en_US + language_list = ['en_US'] + # NOTE(luisg): Babel <1.0 used a function called list(), which was + # renamed to locale_identifiers() in >=1.0, the requirements master list + # requires >=0.9.6, uncapped, so defensively work with both. We can remove + # this check when the master list updates to >=1.0, and all projects udpate + list_identifiers = (getattr(localedata, 'list', None) or + getattr(localedata, 'locale_identifiers')) + locale_identifiers = list_identifiers() + for i in locale_identifiers: + if find(i) is not None: + language_list.append(i) + _AVAILABLE_LANGUAGES[domain] = language_list + return copy.copy(language_list) + + +def get_localized_message(message, user_locale): + """Gets a localized version of the given message in the given locale.""" + if isinstance(message, Message): + if user_locale: + message.locale = user_locale + return six.text_type(message) + else: + return message class LocaleHandler(logging.Handler): |