# ===========================================================================
# eXe 
# Copyright 2004-2006, University of Auckland
#
# 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
# ===========================================================================
"""
Functions that help with translation
"""

# Install x_ as the fake/late translate mechanism before doing any serious
# importing
__builtins__['x_'] = lambda x:x

def lateTranslate(propName):
    """
    Given a property name, returns a read/write property that is translated
    every time it is read
    """
    propName = '_%s' % propName
    def set_prop(self, value):
        """
        Used to write the property
        """
        #return lambda self, value: setattr(self, propName, value)
        setattr(self, propName, value)
    def get_prop(self):
        """
        Translates a property value on the fly
        """
        value = getattr(self, propName)
        # Don't try to translate empty strings
        if value:
            return _(value)
        else:
            return value
    return property(get_prop, set_prop)

def installSafeTranslate():
    """
    Makes '_' do safe translating
    Assumes '_' is already installed as the normal translate method
    """
    def checkInstall():
        return __builtins__['_'] is installSafeTranslate
    if checkInstall(): return
    else:
        __builtins__['__old_translate__'] = __builtins__['_']
        __builtins__['_'] = safeTranslate

def safeTranslate(message, encoding='utf-8'):
    """
    Safely translates a string
    """
    # Allow translating from foreign strings
    # Had a prob, trying to translate the "purpose"
    # of an idevice from Spanish to Spanish. Unicode couldn't
    # decode the accents, because it was assuming that it was
    # in ASCII codec
    try:
        return __old_translate__(message)
    except UnicodeDecodeError, e:
        try:
            return __old_translate__(unicode(message, encoding))
        except Exception:
            raise e