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# Copyright 2012 Red Hat, Inc.
# 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
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Translation function factory
"""
import gettext
import os
import six
from oslo.i18n import _lazy
from oslo.i18n import _locale
from oslo.i18n import _message
__all__ = [
'TranslatorFactory',
]
class TranslatorFactory(object):
"Create translator functions"
def __init__(self, domain, localedir=None):
"""Establish a set of translation functions for the domain.
:param domain: Name of translation domain,
specifying a message catalog.
:type domain: str
:param localedir: Directory with translation catalogs.
:type localedir: str
"""
self.domain = domain
if localedir is None:
variable_name = _locale.get_locale_dir_variable_name(domain)
localedir = os.environ.get(variable_name)
self.localedir = localedir
def _make_translation_func(self, domain=None):
"""Return a translation function ready for use with messages.
The returned function takes a single value, the unicode string
to be translated. The return type varies depending on whether
lazy translation is being done. When lazy translation is
enabled, :class:`Message` objects are returned instead of
regular :class:`unicode` strings.
The domain argument can be specified to override the default
from the factory, but the localedir from the factory is always
used because we assume the log-level translation catalogs are
installed in the same directory as the main application
catalog.
"""
if domain is None:
domain = self.domain
t = gettext.translation(domain,
localedir=self.localedir,
fallback=True)
# Use the appropriate method of the translation object based
# on the python version.
m = t.gettext if six.PY3 else t.ugettext
def f(msg):
"""oslo.i18n.gettextutils translation function."""
if _lazy.USE_LAZY:
return _message.Message(msg, domain=domain)
return m(msg)
return f
@property
def primary(self):
"The default translation function."
return self._make_translation_func()
def _make_log_translation_func(self, level):
return self._make_translation_func(self.domain + '-log-' + level)
@property
def log_info(self):
"Translate info-level log messages."
return self._make_log_translation_func('info')
@property
def log_warning(self):
"Translate warning-level log messages."
return self._make_log_translation_func('warning')
@property
def log_error(self):
"Translate error-level log messages."
return self._make_log_translation_func('error')
@property
def log_critical(self):
"Translate critical-level log messages."
return self._make_log_translation_func('critical')
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