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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.
"""
from functools import wraps
from gettext import GNUTranslations
from zope.interface import implementer
from zope.i18n.interfaces import IGlobalMessageCatalog
class _KeyErrorRaisingFallback:
def ugettext(self, message):
raise KeyError(message)
def ungettext(self, singular, plural, n):
raise KeyError(singular)
gettext = ugettext
ngettext = ungettext
def plural_formatting(func):
"""This decorator interpolates the possible formatting marker.
This interpolation marker is usally present for plurals.
Example: `There are %d apples` or `They have %s pies.`
Please note that the interpolation can be done, alternatively,
using the mapping. This is only present as a conveniance.
"""
@wraps(func)
def pformat(catalog, singular, plural, n, *args, **kwargs):
msg = func(catalog, singular, plural, n, *args, **kwargs)
try:
return msg % n
except TypeError:
# The message cannot be formatted : return it "raw".
return msg
return pformat
@implementer(IGlobalMessageCatalog)
class GettextMessageCatalog:
"""A message catalog based on GNU gettext and Python's gettext module."""
_catalog = None
def __init__(self, language, domain, path_to_file):
"""Initialize the message catalog"""
self.language = (
language.decode('utf-8') if isinstance(language, bytes)
else language)
self.domain = (
domain.decode("utf-8") if isinstance(domain, bytes)
else domain)
self._path_to_file = path_to_file
self.reload()
catalog = self._catalog
catalog.add_fallback(_KeyErrorRaisingFallback())
self._gettext = (
catalog.gettext if str is not bytes else catalog.ugettext)
self._ngettext = (
catalog.ngettext if str is not bytes else catalog.ungettext)
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)
@plural_formatting
def getPluralMessage(self, singular, plural, n):
'See IMessageCatalog'
return self._ngettext(singular, plural, n)
@plural_formatting
def queryPluralMessage(self, singular, plural, n, dft1=None, dft2=None):
'See IMessageCatalog'
try:
return self._ngettext(singular, plural, n)
except KeyError:
# Here, we use the catalog plural function to determine
# if `n` triggers a plural form or not.
if self._catalog.plural(n):
return dft2
return dft1
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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