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# DistUpgradeGettext.py - safe wrapper around gettext
#
# Copyright (c) 2008 Canonical
#
# Author: Michael Vogt <michael.vogt@ubuntu.com>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA
import logging
import gettext as mygettext
_gettext_method = "gettext"
_ngettext_method = "ngettext"
def _verify(message, translated):
"""
helper that verifies that the message and the translated
message have the same number (and type) of % args
"""
arguments_in_message = message.count("%") - message.count("\%")
arguments_in_translation = translated.count("%") - translated.count("\%")
return arguments_in_message == arguments_in_translation
_translation_singleton = None
def _translation():
"""Return a suitable gettext.*Translations instance."""
global _translation_singleton
if _translation_singleton is None:
domain = mygettext.textdomain()
_translation_singleton = mygettext.translation(
domain, mygettext.bindtextdomain(domain), fallback=True)
return _translation_singleton
def unicode_gettext(translation, message):
return getattr(translation, _gettext_method)(message)
def unicode_ngettext(translation, singular, plural, n):
return getattr(translation, _ngettext_method)(singular, plural, n)
def gettext(message):
"""
version of gettext that logs errors but does not crash on incorrect
number of arguments
"""
if message == "":
return ""
translated_msg = unicode_gettext(_translation(), message)
if not _verify(message, translated_msg):
logging.error(
"incorrect translation for message '%s' to '%s' "
"(wrong number of arguments)" % (message, translated_msg))
return message
return translated_msg
def ngettext(msgid1, msgid2, n):
"""
version of ngettext that logs errors but does not crash on incorrect
number of arguments
"""
translated_msg = unicode_ngettext(_translation(), msgid1, msgid2, n)
if not _verify(msgid1, translated_msg):
logging.error(
"incorrect translation for ngettext message "
"'%s' plural: '%s' to '%s' (wrong number of arguments)" % (
msgid1, msgid2, translated_msg))
# dumb fallback to not crash
if n == 1:
return msgid1
return msgid2
return translated_msg