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111 lines
3.5 KiB
Python
111 lines
3.5 KiB
Python
# Copyright (C) 2010 One Laptop Per Child
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#
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# Author: Sayamindu Dasgupta <sayamindu@laptop.org>
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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from gettext import gettext
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import locale
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import os
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import struct
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import sys
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import dateutil.parser
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import time
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_MO_BIG_ENDIAN = 0xde120495
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_MO_LITTLE_ENDIAN = 0x950412de
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def _read_bin(handle, format_string, byte_count):
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read_bytes = handle.read(byte_count)
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return_value = struct.unpack(format_string, read_bytes)
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if len(return_value) == 1:
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return return_value[0]
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else:
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return return_value
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def _extract_header(file_path):
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header = ''
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handle = open(file_path, 'rb')
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magic_number = _read_bin(handle, '<I', 4)
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if magic_number == _MO_BIG_ENDIAN:
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format_string = '>II'
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elif magic_number == _MO_LITTLE_ENDIAN:
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format_string = '<II'
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else:
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raise IOError('File does not seem to be a valid MO file')
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version_, num_of_strings = _read_bin(handle, format_string, 8)
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msgids_hash_offset, msgstrs_hash_offset = _read_bin(handle,
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format_string, 8)
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handle.seek(msgids_hash_offset)
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msgids_index = []
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for i in range(num_of_strings):
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msgids_index.append(_read_bin(handle, format_string, 8))
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handle.seek(msgstrs_hash_offset)
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msgstrs_index = []
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for i in range(num_of_strings):
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msgstrs_index.append(_read_bin(handle, format_string, 8))
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for i in range(num_of_strings):
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handle.seek(msgids_index[i][1])
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msgid = handle.read(msgids_index[i][0])
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if msgid == '':
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handle.seek(msgstrs_index[i][1])
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msgstr = handle.read(msgstrs_index[i][0])
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header = msgstr
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break
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else:
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continue
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handle.close()
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return header
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def _extract_modification_time(file_path):
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header = _extract_header(file_path)
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items = header.split('\n')
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for item in items:
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if item.startswith('PO-Revision-Date:'):
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time_str = item.split(': ')[1]
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parsed_time = dateutil.parser.parse(time_str)
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return time.mktime(parsed_time.timetuple())
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raise ValueError('Could not find a revision date')
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# We ship our own version of pgettext() because Python 2.x will never contain
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# it: http://bugs.python.org/issue2504#msg122482
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def pgettext(context, message):
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"""
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Return the localized translation of message, based on context and
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the current global domain, language, and locale directory.
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Similar to gettext(). Context is a string used to disambiguate
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messages that are the same in the source language (usually english),
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but might be different in one or more of the target languages.
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"""
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translation = gettext('\x04'.join([context, message]))
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if '\x04' in translation:
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return message
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return translation
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