120 lines
3.9 KiB
Python
120 lines
3.9 KiB
Python
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# Copyright 2012 Red Hat, Inc.
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# Copyright 2013 IBM Corp.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""gettextutils provides a wrapper around gettext for OpenStack projects
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"""
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import copy
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import gettext
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import locale
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import os
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from oslo_i18n import _factory
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from oslo_i18n import _locale
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__all__ = [
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'install',
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'get_available_languages',
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]
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def install(domain):
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"""Install a _() function using the given translation domain.
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Given a translation domain, install a _() function using gettext's
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install() function.
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The main difference from gettext.install() is that we allow
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overriding the default localedir (e.g. /usr/share/locale) using
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a translation-domain-specific environment variable (e.g.
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NOVA_LOCALEDIR).
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:param domain: the translation domain
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"""
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import builtins
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tf = _factory.TranslatorFactory(domain)
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builtins.__dict__['_'] = tf.primary
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_AVAILABLE_LANGUAGES = {}
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# Copied from Babel so anyone using aliases that were previously provided by
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# the Babel implementation of get_available_languages continues to work. These
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# are not recommended for use in new code.
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_BABEL_ALIASES = {
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'ar': 'ar_SY', 'bg': 'bg_BG', 'bs': 'bs_BA', 'ca': 'ca_ES', 'cs': 'cs_CZ',
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'da': 'da_DK', 'de': 'de_DE', 'el': 'el_GR', 'en': 'en_US', 'es': 'es_ES',
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'et': 'et_EE', 'fa': 'fa_IR', 'fi': 'fi_FI', 'fr': 'fr_FR', 'gl': 'gl_ES',
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'he': 'he_IL', 'hu': 'hu_HU', 'id': 'id_ID', 'is': 'is_IS', 'it': 'it_IT',
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'ja': 'ja_JP', 'km': 'km_KH', 'ko': 'ko_KR', 'lt': 'lt_LT', 'lv': 'lv_LV',
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'mk': 'mk_MK', 'nl': 'nl_NL', 'nn': 'nn_NO', 'no': 'nb_NO', 'pl': 'pl_PL',
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'pt': 'pt_PT', 'ro': 'ro_RO', 'ru': 'ru_RU', 'sk': 'sk_SK', 'sl': 'sl_SI',
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'sv': 'sv_SE', 'th': 'th_TH', 'tr': 'tr_TR', 'uk': 'uk_UA'
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}
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def get_available_languages(domain):
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"""Lists the available languages for the given translation domain.
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:param domain: the domain to get languages for
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"""
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if domain in _AVAILABLE_LANGUAGES:
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return copy.copy(_AVAILABLE_LANGUAGES[domain])
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localedir = os.environ.get(_locale.get_locale_dir_variable_name(domain))
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def find(x):
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return gettext.find(domain, localedir=localedir, languages=[x])
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# NOTE(mrodden): en_US should always be available (and first in case
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# order matters) since our in-line message strings are en_US
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language_list = ['en_US']
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locale_identifiers = set(locale.windows_locale.values())
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language_list.extend(
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language for language in locale_identifiers if find(language)
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)
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language_list.extend(
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alias for alias, _ in _BABEL_ALIASES.items() if find(alias)
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)
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_AVAILABLE_LANGUAGES[domain] = language_list
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return copy.copy(language_list)
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_original_find = gettext.find
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_FIND_CACHE = {}
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def cached_find(domain, localedir=None, languages=None, all=0):
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"""A version of gettext.find using a cache.
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gettext.find looks for mo files on the disk using os.path.exists. Those
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don't tend to change over time, but the system calls pile up with a
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long-running service. This caches the result so that we return the same mo
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files, and only call find once per domain.
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"""
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key = (domain,
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localedir,
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tuple(languages) if languages is not None else None,
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all)
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if key in _FIND_CACHE:
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return _FIND_CACHE[key]
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result = _original_find(domain, localedir, languages, all)
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_FIND_CACHE[key] = result
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return result
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gettext.find = cached_find
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