Limnoria/src/i18n.py

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###
# Copyright (c) 2010, Valentin Lorentz
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions, and the following disclaimer.
# * 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.
# * Neither the name of the author of this software nor the name of
# contributors to this software may be used to endorse or promote products
# derived from this software without specific prior written consent.
#
# 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 OWNER 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.
###
"""
Supybot internationalisation and localisation managment.
"""
__all__ = ['PluginInternationalization', 'internationalizeDocstring']
import os
import re
import sys
import time
import weakref
import threading
conf = None
# Don't import conf here ; because conf needs this module
WAITING_FOR_MSGID = 1
IN_MSGID = 2
WAITING_FOR_MSGSTR = 3
IN_MSGSTR = 4
MSGID = 'msgid "'
MSGSTR = 'msgstr "'
currentLocale = 'en'
class PluginNotFound(Exception):
pass
def getLocaleFromRegistryFilename(filename):
"""Called by the 'supybot' script. Gets the locale name before conf is
loaded."""
global currentLocale
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with open(filename, 'r') as fd:
for line in fd:
if line.startswith('supybot.language: '):
currentLocale = line[len('supybot.language: '):]
def import_conf():
"""Imports the conf into this module"""
global conf
conf = __import__('supybot.conf').conf
conf.registerGlobalValue(conf.supybot, 'language',
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conf.registry.String(currentLocale, """Determines the bot's default
language. Valid values are things like en, fr, de, etc."""))
conf.supybot.language.addCallback(reloadLocalesIfRequired)
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def getPluginDir(plugin_name):
"""Gets the directory of the given plugin"""
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filename = None
try:
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filename = sys.modules[plugin_name].__file__
except KeyError: # It sometimes happens with Owner
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pass
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if filename == None:
try:
filename = sys.modules['supybot.plugins.' + plugin_name].__file__
except: # In the case where the plugin is not loaded by Supybot
try:
filename = sys.modules['plugin'].__file__
except:
filename = sys.modules['__main__'].__file__
if filename.endswith(".pyc"):
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filename = filename[0:-1]
allowed_files = ['__init__.py', 'config.py', 'plugin.py', 'test.py']
for allowed_file in allowed_files:
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if filename.endswith(allowed_file):
return filename[0:-len(allowed_file)]
raise PluginNotFound()
def getLocalePath(name, localeName, extension):
"""Gets the path of the locale file of the given plugin ('supybot' stands
for the core)."""
if name != 'supybot':
base = getPluginDir(name)
else:
from . import ansi # Any Supybot plugin could fit
base = ansi.__file__[0:-len('ansi.pyc')]
directory = os.path.join(base, 'locales')
return '%s/%s.%s' % (directory, localeName, extension)
i18nClasses = weakref.WeakValueDictionary()
internationalizedCommands = weakref.WeakValueDictionary()
internationalizedFunctions = [] # No need to know their name
def reloadLocalesIfRequired():
global currentLocale
if conf is None:
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return
if currentLocale != conf.supybot.language():
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currentLocale = conf.supybot.language()
reloadLocales()
def reloadLocales():
for pluginClass in i18nClasses.values():
pluginClass.loadLocale()
for command in internationalizedCommands.values():
internationalizeDocstring(command)
for function in internationalizedFunctions:
function.loadLocale()
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def normalize(string, removeNewline=False):
import supybot.utils as utils
string = string.replace('\\n\\n', '\n\n')
string = string.replace('\\n', ' ')
string = string.replace('\\"', '"')
string = string.replace("\'", "'")
string = utils.str.normalizeWhitespace(string, removeNewline)
string = string.strip('\n')
string = string.strip('\t')
return string
def parse(translationFile):
step = WAITING_FOR_MSGID
translations = set()
for line in translationFile:
line = line[0:-1] # Remove the ending \n
line = line
if line.startswith(MSGID):
# Don't check if step is WAITING_FOR_MSGID
untranslated = ''
translated = ''
data = line[len(MSGID):-1]
if len(data) == 0: # Multiline mode
step = IN_MSGID
else:
untranslated += data
step = WAITING_FOR_MSGSTR
elif step is IN_MSGID and line.startswith('"') and \
line.endswith('"'):
untranslated += line[1:-1]
elif step is IN_MSGID and untranslated == '': # Empty MSGID
step = WAITING_FOR_MSGID
elif step is IN_MSGID: # the MSGID is finished
step = WAITING_FOR_MSGSTR
if step is WAITING_FOR_MSGSTR and line.startswith(MSGSTR):
data = line[len(MSGSTR):-1]
if len(data) == 0: # Multiline mode
step = IN_MSGSTR
else:
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translations |= set([(untranslated, data)])
step = WAITING_FOR_MSGID
elif step is IN_MSGSTR and line.startswith('"') and \
line.endswith('"'):
translated += line[1:-1]
elif step is IN_MSGSTR: # the MSGSTR is finished
step = WAITING_FOR_MSGID
if translated == '':
translated = untranslated
translations |= set([(untranslated, translated)])
if step is IN_MSGSTR:
if translated == '':
translated = untranslated
translations |= set([(untranslated, translated)])
return translations
i18nSupybot = None
def PluginInternationalization(name='supybot'):
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# This is a proxy that prevents having several objects for the same plugin
if name in i18nClasses:
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return i18nClasses[name]
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else:
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return _PluginInternationalization(name)
class _PluginInternationalization:
"""Internationalization managment for a plugin."""
def __init__(self, name='supybot'):
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self.name = name
self.translations = {}
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self.currentLocaleName = None
i18nClasses.update({name: self})
self.loadLocale()
def loadLocale(self, localeName=None):
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"""(Re)loads the locale used by this class."""
self.translations = {}
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if localeName is None:
localeName = currentLocale
self.currentLocaleName = localeName
self._loadL10nCode()
try:
try:
translationFile = open(getLocalePath(self.name,
localeName, 'po'), 'ru')
except ValueError: # We are using Windows
translationFile = open(getLocalePath(self.name,
localeName, 'po'), 'r')
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self._parse(translationFile)
except (IOError, PluginNotFound): # The translation is unavailable
pass
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finally:
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if 'translationFile' in locals():
translationFile.close()
def _parse(self, translationFile):
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"""A .po files parser.
Give it a file object."""
self.translations = {}
for translation in parse(translationFile):
self._addToDatabase(*translation)
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def _addToDatabase(self, untranslated, translated):
untranslated = normalize(untranslated, True)
translated = normalize(translated)
if translated:
self.translations.update({untranslated: translated})
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def __call__(self, untranslated):
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"""Main function.
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This is the function which is called when a plugin runs _()"""
normalizedUntranslated = normalize(untranslated, True)
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try:
string = self._translate(normalizedUntranslated)
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return self._addTracker(string, untranslated)
except KeyError:
pass
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if untranslated.__class__ is InternationalizedString:
return untranslated._original
else:
return untranslated
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def _translate(self, string):
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"""Translate the string.
C the string internationalizer if any; else, use the local database"""
if string.__class__ == InternationalizedString:
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return string._internationalizer(string.untranslated)
else:
return self.translations[string]
def _addTracker(self, string, untranslated):
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"""Add a kind of 'tracker' on the string, in order to keep the
untranslated string (used when changing the locale)"""
if string.__class__ == InternationalizedString:
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return string
else:
string = InternationalizedString(string)
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string._original = untranslated
string._internationalizer = self
return string
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def _loadL10nCode(self):
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"""Open the file containing the code specific to this locale, and
load its functions."""
if self.name != 'supybot':
return
path = self._getL10nCodePath()
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try:
with open(path) as fd:
exec(compile(fd.read(), path, 'exec'))
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except IOError: # File doesn't exist
pass
functions = locals()
functions.pop('self')
self._l10nFunctions = functions
# Remove old functions and come back to the native language
def _getL10nCodePath(self):
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"""Returns the path to the code localization file.
It contains functions that needs to by fully (code + strings)
localized"""
if self.name != 'supybot':
return
return getLocalePath('supybot', self.currentLocaleName, 'py')
def localizeFunction(self, name):
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"""Returns the localized version of the function.
Should be used only by the InternationalizedFunction class"""
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if self.name != 'supybot':
return
if hasattr(self, '_l10nFunctions') and \
name in self._l10nFunctions:
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return self._l10nFunctions[name]
def internationalizeFunction(self, name):
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"""Decorates functions and internationalize their code.
Only useful for Supybot core functions"""
if self.name != 'supybot':
return
class FunctionInternationalizer:
def __init__(self, parent, name):
self._parent = parent
self._name = name
def __call__(self, obj):
obj = InternationalizedFunction(self._parent, self._name, obj)
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obj.loadLocale()
return obj
return FunctionInternationalizer(self, name)
class InternationalizedFunction:
"""Proxy for functions that need to be fully localized.
The localization code is in locales/LOCALE.py"""
def __init__(self, internationalizer, name, function):
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self._internationalizer = internationalizer
self._name = name
self._origin = function
internationalizedFunctions.append(self)
def loadLocale(self):
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self.__call__ = self._internationalizer.localizeFunction(self._name)
if self.__call__ == None:
self.restore()
def restore(self):
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self.__call__ = self._origin
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def __call__(self, *args, **kwargs):
return self._origin(*args, **kwargs)
class InternationalizedString(str):
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"""Simple subclass to str, that allow to add attributes. Also used to
know if a string is already localized"""
pass
def internationalizeDocstring(obj):
"""Decorates functions and internationalize their docstring.
Only useful for commands (commands' docstring is displayed on IRC)"""
if obj.__doc__ == None:
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return obj
plugin_module = sys.modules[obj.__module__]
if '_' in plugin_module.__dict__:
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internationalizedCommands.update({hash(obj): obj})
try:
obj.__doc__ = plugin_module._.__call__(obj.__doc__)
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# We use _.__call__() instead of _() because of a pygettext warning.
except AttributeError:
# attribute '__doc__' of 'type' objects is not writable
pass
return obj