root/galaxy-central/eggs/Babel-0.9.4-py2.6.egg/babel/messages/mofile.py

リビジョン 3, 4.2 KB (コミッタ: kohda, 14 年 前)

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1# -*- coding: utf-8 -*-
2#
3# Copyright (C) 2007 Edgewall Software
4# All rights reserved.
5#
6# This software is licensed as described in the file COPYING, which
7# you should have received as part of this distribution. The terms
8# are also available at http://babel.edgewall.org/wiki/License.
9#
10# This software consists of voluntary contributions made by many
11# individuals. For the exact contribution history, see the revision
12# history and logs, available at http://babel.edgewall.org/log/.
13
14"""Writing of files in the ``gettext`` MO (machine object) format.
15
16:since: version 0.9
17:see: `The Format of MO Files
18       <http://www.gnu.org/software/gettext/manual/gettext.html#MO-Files>`_
19"""
20
21import array
22import struct
23
24__all__ = ['write_mo']
25__docformat__ = 'restructuredtext en'
26
27def write_mo(fileobj, catalog, use_fuzzy=False):
28    """Write a catalog to the specified file-like object using the GNU MO file
29    format.
30   
31    >>> from babel.messages import Catalog
32    >>> from gettext import GNUTranslations
33    >>> from StringIO import StringIO
34   
35    >>> catalog = Catalog(locale='en_US')
36    >>> catalog.add('foo', 'Voh')
37    >>> catalog.add((u'bar', u'baz'), (u'Bahr', u'Batz'))
38    >>> catalog.add('fuz', 'Futz', flags=['fuzzy'])
39    >>> catalog.add('Fizz', '')
40    >>> catalog.add(('Fuzz', 'Fuzzes'), ('', ''))
41    >>> buf = StringIO()
42   
43    >>> write_mo(buf, catalog)
44    >>> buf.seek(0)
45    >>> translations = GNUTranslations(fp=buf)
46    >>> translations.ugettext('foo')
47    u'Voh'
48    >>> translations.ungettext('bar', 'baz', 1)
49    u'Bahr'
50    >>> translations.ungettext('bar', 'baz', 2)
51    u'Batz'
52    >>> translations.ugettext('fuz')
53    u'fuz'
54    >>> translations.ugettext('Fizz')
55    u'Fizz'
56    >>> translations.ugettext('Fuzz')
57    u'Fuzz'
58    >>> translations.ugettext('Fuzzes')
59    u'Fuzzes'
60   
61    :param fileobj: the file-like object to write to
62    :param catalog: the `Catalog` instance
63    :param use_fuzzy: whether translations marked as "fuzzy" should be included
64                      in the output
65    """
66    messages = list(catalog)
67    if not use_fuzzy:
68        messages[1:] = [m for m in messages[1:] if not m.fuzzy]
69    messages.sort()
70
71    ids = strs = ''
72    offsets = []
73
74    for message in messages:
75        # For each string, we need size and file offset.  Each string is NUL
76        # terminated; the NUL does not count into the size.
77        if message.pluralizable:
78            msgid = '\x00'.join([
79                msgid.encode(catalog.charset) for msgid in message.id
80            ])
81            msgstrs = []
82            for idx, string in enumerate(message.string):
83                if not string:
84                    msgstrs.append(message.id[min(int(idx), 1)])
85                else:
86                    msgstrs.append(string)
87            msgstr = '\x00'.join([
88                msgstr.encode(catalog.charset) for msgstr in msgstrs
89            ])
90        else:
91            msgid = message.id.encode(catalog.charset)
92            if not message.string:
93                msgstr = message.id.encode(catalog.charset)
94            else:
95                msgstr = message.string.encode(catalog.charset)
96        offsets.append((len(ids), len(msgid), len(strs), len(msgstr)))
97        ids += msgid + '\x00'
98        strs += msgstr + '\x00'
99
100    # The header is 7 32-bit unsigned integers.  We don't use hash tables, so
101    # the keys start right after the index tables.
102    keystart = 7 * 4 + 16 * len(messages)
103    valuestart = keystart + len(ids)
104
105    # The string table first has the list of keys, then the list of values.
106    # Each entry has first the size of the string, then the file offset.
107    koffsets = []
108    voffsets = []
109    for o1, l1, o2, l2 in offsets:
110        koffsets += [l1, o1 + keystart]
111        voffsets += [l2, o2 + valuestart]
112    offsets = koffsets + voffsets
113
114    fileobj.write(struct.pack('Iiiiiii',
115        0x950412deL,                # magic
116        0,                          # version
117        len(messages),              # number of entries
118        7 * 4,                      # start of key index
119        7 * 4 + len(messages) * 8,  # start of value index
120        0, 0                        # size and offset of hash table
121    ) + array.array("i", offsets).tostring() + ids + strs)
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