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##############################################################################
#
# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""A simple implementation of a Message Catalog.
"""
import sys
from gettext import GNUTranslations
from zope.i18n.interfaces import IGlobalMessageCatalog
from zope.interface import implementer
PY2 = sys.version_info[0] == 2
class _KeyErrorRaisingFallback(object):
def ugettext(self, message):
raise KeyError(message)
gettext = ugettext
@implementer(IGlobalMessageCatalog)
class GettextMessageCatalog(object):
"""A message catalog based on GNU gettext and Python's gettext module."""
def __init__(self, language, domain, path_to_file):
"""Initialize the message catalog"""
self.language = language
self.domain = domain
self._path_to_file = path_to_file
self.reload()
self._catalog.add_fallback(_KeyErrorRaisingFallback())
if PY2:
self._gettext = self._catalog.ugettext
else:
self._gettext = self._catalog.gettext
def reload(self):
'See IMessageCatalog'
with open(self._path_to_file, 'rb') as fp:
self._catalog = GNUTranslations(fp)
def getMessage(self, id):
'See IMessageCatalog'
return self._gettext(id)
def queryMessage(self, id, default=None):
'See IMessageCatalog'
try:
return self._gettext(id)
except KeyError:
return default
def getIdentifier(self):
'See IMessageCatalog'
return self._path_to_file
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