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#! /usr/bin/env python
# Copyright (C) 2009 Sayamindu Dasgupta <sayamindu@laptop.org>
#
# 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import libxml2
import logging
_ISO_639_XML_PATH = '/usr/share/xml/iso-codes/iso_639.xml'
def singleton(object, instantiated=[]):
# From http://norvig.com/python-iaq.html
"Raise an exception if an obj of this class has been instantiated before"
assert object.__class__ not in instantiated, \
"%s is a Singleton class but is already instantiated" % object.__class__
instantiated.append(object.__class__)
class LanguageNames(object):
def __init__(self):
singleton(self)
try:
self._xmldoc = libxml2.parseFile(_ISO_639_XML_PATH)
self._cache = None
except libxml2.parserError:
self._xmldoc = None
return
self._eroot = self._xmldoc.getRootElement()
def close(self):
if self._xmldoc is not None:
self._xmldoc.freeDoc()
def get_full_language_name(self, code):
if self._cache == None:
self._cache = {}
for child in self._eroot.children:
if child.properties is not None:
lang_code = None
lang_name = None
for property in child.properties:
if property.get_name() == 'name':
lang_name = property.get_content()
elif property.get_name() == 'iso_639_1_code':
lang_code = property.get_content()
if lang_code is not None and lang_name is not None:
self._cache[lang_code] = lang_name
self._xmldoc.freeDoc()
self._xmldoc = None
return self._cache[code]
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