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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.
#
##############################################################################
"""This is a simple implementation of the ITranslationDomain interface.
"""
from zope.interface import implementer
from zope.component import getUtility
from zope.i18n.interfaces import ITranslationDomain, INegotiator
from zope.i18n import interpolate
text_type = str if bytes is not str else unicode
@implementer(ITranslationDomain)
class SimpleTranslationDomain(object):
"""This is the simplest implementation of the ITranslationDomain I
could come up with.
The constructor takes one optional argument 'messages', which will be
used to do the translation. The 'messages' attribute has to have the
following structure:
{('language', 'msg_id'): 'message', ...}
Note: This Translation Domain does not use message catalogs.
"""
# See zope.i18n.interfaces.ITranslationDomain
domain = None
def __init__(self, domain, messages=None):
"""Initializes the object. No arguments are needed."""
self.domain = (
domain.decode("utf-8") if isinstance(domain, bytes) else domain)
self.messages = messages if messages is not None else {}
assert self.messages is not None
def translate(self, msgid, mapping=None, context=None,
target_language=None, default=None, msgid_plural=None,
default_plural=None, number=None):
'''See interface ITranslationDomain'''
# Find out what the target language should be
if target_language is None and context is not None:
langs = [m[0] for m in self.messages.keys()]
# Let's negotiate the language to translate to. :)
negotiator = getUtility(INegotiator)
target_language = negotiator.getLanguage(langs, context)
# Find a translation; if nothing is found, use the default
# value
if default is None:
default = text_type(msgid)
text = self.messages.get((target_language, msgid))
if text is None:
text = default
return interpolate(text, mapping)
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