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bazarr/libs/apprise/AppriseLocale.py

290 lines
8.8 KiB

# -*- coding: utf-8 -*-
# BSD 2-Clause License
#
# Apprise - Push Notification Library.
# Copyright (c) 2024, Chris Caron <lead2gold@gmail.com>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
import ctypes
import locale
import contextlib
import os
import re
from os.path import join
from os.path import dirname
from os.path import abspath
from .logger import logger
# This gets toggled to True if we succeed
GETTEXT_LOADED = False
try:
# Initialize gettext
import gettext
# Toggle our flag
GETTEXT_LOADED = True
except ImportError:
# gettext isn't available; no problem; Use the library features without
# multi-language support.
pass
class AppriseLocale:
"""
A wrapper class to gettext so that we can manipulate multiple lanaguages
on the fly if required.
"""
# Define our translation domain
_domain = 'apprise'
# The path to our translations
_locale_dir = abspath(join(dirname(__file__), 'i18n'))
# Locale regular expression
_local_re = re.compile(
r'^((?P<ansii>C)|(?P<lang>([a-z]{2}))([_:](?P<country>[a-z]{2}))?)'
r'(\.(?P<enc>[a-z0-9-]+))?$', re.IGNORECASE)
# Define our default encoding
_default_encoding = 'utf-8'
# The function to assign `_` by default
_fn = 'gettext'
# The language we should fall back to if all else fails
_default_language = 'en'
def __init__(self, language=None):
"""
Initializes our object, if a language is specified, then we
initialize ourselves to that, otherwise we use whatever we detect
from the local operating system. If all else fails, we resort to the
defined default_language.
"""
# Cache previously loaded translations
self._gtobjs = {}
# Get our language
self.lang = AppriseLocale.detect_language(language)
# Our mapping to our _fn
self.__fn_map = None
if GETTEXT_LOADED is False:
# We're done
return
# Add language
self.add(self.lang)
def add(self, lang=None, set_default=True):
"""
Add a language to our list
"""
lang = lang if lang else self._default_language
if lang not in self._gtobjs:
# Load our gettext object and install our language
try:
self._gtobjs[lang] = gettext.translation(
self._domain, localedir=self._locale_dir, languages=[lang],
fallback=False)
# The non-intrusive method of applying the gettext change to
# the global namespace only
self.__fn_map = getattr(self._gtobjs[lang], self._fn)
except FileNotFoundError:
# The translation directory does not exist
logger.debug(
'Could not load translation path: %s',
join(self._locale_dir, lang))
# Fallback (handle case where self.lang does not exist)
if self.lang not in self._gtobjs:
self._gtobjs[self.lang] = gettext
self.__fn_map = getattr(self._gtobjs[self.lang], self._fn)
return False
logger.trace('Loaded language %s', lang)
if set_default:
logger.debug('Language set to %s', lang)
self.lang = lang
return True
@contextlib.contextmanager
def lang_at(self, lang, mapto=_fn):
"""
The syntax works as:
with at.lang_at('fr'):
# apprise works as though the french language has been
# defined. afterwards, the language falls back to whatever
# it was.
"""
if GETTEXT_LOADED is False:
# Do nothing
yield None
# we're done
return
# Tidy the language
lang = AppriseLocale.detect_language(lang, detect_fallback=False)
if lang not in self._gtobjs and not self.add(lang, set_default=False):
# Do Nothing
yield getattr(self._gtobjs[self.lang], mapto)
else:
# Yield
yield getattr(self._gtobjs[lang], mapto)
return
@property
def gettext(self):
"""
Return the current language gettext() function
Useful for assigning to `_`
"""
return self._gtobjs[self.lang].gettext
@staticmethod
def detect_language(lang=None, detect_fallback=True):
"""
Returns the language (if it's retrievable)
"""
# We want to only use the 2 character version of this language
# hence en_CA becomes en, en_US becomes en.
if not isinstance(lang, str):
if detect_fallback is False:
# no detection enabled; we're done
return None
# Posix lookup
lookup = os.environ.get
localename = None
for variable in ('LC_ALL', 'LC_CTYPE', 'LANG', 'LANGUAGE'):
localename = lookup(variable, None)
if localename:
result = AppriseLocale._local_re.match(localename)
if result and result.group('lang'):
return result.group('lang').lower()
# Windows handling
if hasattr(ctypes, 'windll'):
windll = ctypes.windll.kernel32
try:
lang = locale.windows_locale[
windll.GetUserDefaultUILanguage()]
# Our detected windows language
return lang[0:2].lower()
except (TypeError, KeyError):
# Fallback to posix detection
pass
# Built in locale library check
try:
# Acquire our locale
lang = locale.getlocale()[0]
# Compatibility for Python >= 3.12
if lang == 'C':
lang = AppriseLocale._default_language
except (ValueError, TypeError) as e:
# This occurs when an invalid locale was parsed from the
# environment variable. While we still return None in this
# case, we want to better notify the end user of this. Users
# receiving this error should check their environment
# variables.
logger.warning(
'Language detection failure / {}'.format(str(e)))
return None
return None if not lang else lang[0:2].lower()
def __getstate__(self):
"""
Pickle Support dumps()
"""
state = self.__dict__.copy()
# Remove the unpicklable entries.
del state['_gtobjs']
del state['_AppriseLocale__fn_map']
return state
def __setstate__(self, state):
"""
Pickle Support loads()
"""
self.__dict__.update(state)
# Our mapping to our _fn
self.__fn_map = None
self._gtobjs = {}
self.add(state['lang'], set_default=True)
#
# Prepare our default LOCALE Singleton
#
LOCALE = AppriseLocale()
class LazyTranslation:
"""
Doesn't translate anything until str() or unicode() references
are made.
"""
def __init__(self, text, *args, **kwargs):
"""
Store our text
"""
self.text = text
super().__init__(*args, **kwargs)
def __str__(self):
return LOCALE.gettext(self.text) if GETTEXT_LOADED else self.text
# Lazy translation handling
def gettext_lazy(text):
"""
A dummy function that can be referenced
"""
return LazyTranslation(text=text)