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Edit File: mofile.py

# -*- coding: utf-8 -*-
#
# Copyright (C) 2007 Edgewall Software
# All rights reserved.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at http://babel.edgewall.org/wiki/License.
#
# This software consists of voluntary contributions made by many
# individuals. For the exact contribution history, see the revision
# history and logs, available at http://babel.edgewall.org/log/.

"""Writing of files in the ``gettext`` MO (machine object) format.

:since: version 0.9
:see: `The Format of MO Files
       <http://www.gnu.org/software/gettext/manual/gettext.html#MO-Files>`_
"""

import array
import struct

__all__ = ['write_mo']
__docformat__ = 'restructuredtext en'

def write_mo(fileobj, catalog, use_fuzzy=False):
    """Write a catalog to the specified file-like object using the GNU MO file
    format.
    
    >>> from babel.messages import Catalog
    >>> from gettext import GNUTranslations
    >>> from StringIO import StringIO
    
    >>> catalog = Catalog(locale='en_US')
    >>> catalog.add('foo', 'Voh')
    >>> catalog.add((u'bar', u'baz'), (u'Bahr', u'Batz'))
    >>> catalog.add('fuz', 'Futz', flags=['fuzzy'])
    >>> catalog.add('Fizz', '')
    >>> catalog.add(('Fuzz', 'Fuzzes'), ('', ''))
    >>> buf = StringIO()
    
    >>> write_mo(buf, catalog)
    >>> buf.seek(0)
    >>> translations = GNUTranslations(fp=buf)
    >>> translations.ugettext('foo')
    u'Voh'
    >>> translations.ungettext('bar', 'baz', 1)
    u'Bahr'
    >>> translations.ungettext('bar', 'baz', 2)
    u'Batz'
    >>> translations.ugettext('fuz')
    u'fuz'
    >>> translations.ugettext('Fizz')
    u'Fizz'
    >>> translations.ugettext('Fuzz')
    u'Fuzz'
    >>> translations.ugettext('Fuzzes')
    u'Fuzzes'
    
    :param fileobj: the file-like object to write to
    :param catalog: the `Catalog` instance
    :param use_fuzzy: whether translations marked as "fuzzy" should be included
                      in the output
    """
    messages = list(catalog)
    if not use_fuzzy:
        messages[1:] = [m for m in messages[1:] if not m.fuzzy]
    messages.sort()

ids = strs = ''
    offsets = []

for message in messages:
        # For each string, we need size and file offset.  Each string is NUL
        # terminated; the NUL does not count into the size.
        if message.pluralizable:
            msgid = '\x00'.join([
                msgid.encode(catalog.charset) for msgid in message.id
            ])
            msgstrs = []
            for idx, string in enumerate(message.string):
                if not string:
                    msgstrs.append(message.id[min(int(idx), 1)])
                else:
                    msgstrs.append(string)
            msgstr = '\x00'.join([
                msgstr.encode(catalog.charset) for msgstr in msgstrs
            ])
        else:
            msgid = message.id.encode(catalog.charset)
            if not message.string:
                msgstr = message.id.encode(catalog.charset)
            else:
                msgstr = message.string.encode(catalog.charset)
        offsets.append((len(ids), len(msgid), len(strs), len(msgstr)))
        ids += msgid + '\x00'
        strs += msgstr + '\x00'

# The header is 7 32-bit unsigned integers.  We don't use hash tables, so
    # the keys start right after the index tables.
    keystart = 7 * 4 + 16 * len(messages)
    valuestart = keystart + len(ids)

# The string table first has the list of keys, then the list of values.
    # Each entry has first the size of the string, then the file offset.
    koffsets = []
    voffsets = []
    for o1, l1, o2, l2 in offsets:
        koffsets += [l1, o1 + keystart]
        voffsets += [l2, o2 + valuestart]
    offsets = koffsets + voffsets

fileobj.write(struct.pack('Iiiiiii',
        0x950412deL,                # magic
        0,                          # version
        len(messages),              # number of entries
        7 * 4,                      # start of key index
        7 * 4 + len(messages) * 8,  # start of value index
        0, 0                        # size and offset of hash table
    ) + array.array("i", offsets).tostring() + ids + strs)