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# Copyright (C) 2010 One Laptop Per Child
#
# Author: Sayamindu Dasgupta <sayamindu@laptop.org>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
import gconf
import locale
import os
import struct
import sys
import dateutil.parser
import time
_MO_BIG_ENDIAN = 0xde120495
_MO_LITTLE_ENDIAN = 0x950412de
def _read_bin(handle, format_string, byte_count):
read_bytes = handle.read(byte_count)
return_value = struct.unpack(format_string, read_bytes)
if len(return_value) == 1:
return return_value[0]
else:
return return_value
def _extract_header(file_path):
header = ''
handle = open(file_path, 'rb')
magic_number = _read_bin(handle, '<I', 4)
if magic_number == _MO_BIG_ENDIAN:
format_string = '>II'
elif magic_number == _MO_LITTLE_ENDIAN:
format_string = '<II'
else:
raise IOError('File does not seem to be a valid MO file')
version_, num_of_strings = _read_bin(handle, format_string, 8)
msgids_hash_offset, msgstrs_hash_offset = _read_bin(handle, \
format_string, 8)
handle.seek(msgids_hash_offset)
msgids_index = []
for i in range(num_of_strings):
msgids_index.append(_read_bin(handle, format_string, 8))
handle.seek(msgstrs_hash_offset)
msgstrs_index = []
for i in range(num_of_strings):
msgstrs_index.append(_read_bin(handle, format_string, 8))
for i in range(num_of_strings):
handle.seek(msgids_index[i][1])
msgid = handle.read(msgids_index[i][0])
if msgid == '':
handle.seek(msgstrs_index[i][1])
msgstr = handle.read(msgstrs_index[i][0])
header = msgstr
break
else:
continue
handle.close()
return header
def _extract_modification_time(file_path):
header = _extract_header(file_path)
items = header.split('\n')
for item in items:
if item.startswith('PO-Revision-Date:'):
time_str = item.split(': ')[1]
parsed_time = dateutil.parser.parse(time_str)
return time.mktime(parsed_time.timetuple())
raise ValueError('Could not find a revision date')
def get_locale_path(bundle_id):
""" Returns the locale path, which is the directory where the preferred
MO file is located.
The preferred MO file is the one with the latest translation.
@type bundle_id: string
@param bundle_id: The bundle id of the activity in question
@rtype: string
@return: the preferred locale path
"""
# Note: We pre-assign weights to the directories so that if no translations
# exist, the appropriate fallbacks (eg: bn for bn_BD) can be loaded
# The directory with the highest weight is returned, and if a MO file is
# found, the weight of the directory is set to the MO's modification time
# (as described in the MO header, and _not_ the filesystem mtime)
candidate_dirs = {}
if 'SUGAR_LOCALEDIR' in os.environ:
candidate_dirs[os.environ['SUGAR_LOCALEDIR']] = 2
gconf_client = gconf.client_get_default()
package_dir = gconf_client.get_string("/desktop/sugar/i18n/langpackdir")
if package_dir is not None and package_dir is not '':
candidate_dirs[package_dir] = 1
candidate_dirs[os.path.join(sys.prefix, 'share', 'locale')] = 0
for candidate_dir in candidate_dirs.keys():
if os.path.exists(candidate_dir):
full_path = os.path.join(candidate_dir, \
locale.getdefaultlocale()[0], 'LC_MESSAGES', \
bundle_id + '.mo')
if os.path.exists(full_path):
try:
candidate_dirs[candidate_dir] = \
_extract_modification_time(full_path)
except (IOError, ValueError):
# The mo file is damaged or has not been initialized
# Set lowest priority
candidate_dirs[candidate_dir] = -1
available_paths = sorted(candidate_dirs.iteritems(), key=lambda (k, v): \
(v, k), reverse=True)
preferred_path = available_paths[0][0]
return preferred_path
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