gettext.py
author Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
Thu, 28 May 2009 09:20:07 +0200
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"""Internationalization and localization support.
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This module provides internationalization (I18N) and localization (L10N)
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support for your Python programs by providing an interface to the GNU gettext
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message catalog library.
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I18N refers to the operation by which a program is made aware of multiple
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languages.  L10N refers to the adaptation of your program, once
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internationalized, to the local language and cultural habits.
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1977
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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# This module represents the integration of work, contributions, feedback, and
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# suggestions from the following people:
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#
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# Martin von Loewis, who wrote the initial implementation of the underlying
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# C-based libintlmodule (later renamed _gettext), along with a skeletal
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# gettext.py implementation.
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#
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# Peter Funk, who wrote fintl.py, a fairly complete wrapper around intlmodule,
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# which also included a pure-Python implementation to read .mo files if
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# intlmodule wasn't available.
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#
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# James Henstridge, who also wrote a gettext.py module, which has some
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# interesting, but currently unsupported experimental features: the notion of
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# a Catalog class and instances, and the ability to add to a catalog file via
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# a Python API.
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#
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# Barry Warsaw integrated these modules, wrote the .install() API and code,
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# and conformed all C and Python code to Python's coding standards.
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#
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# Francois Pinard and Marc-Andre Lemburg also contributed valuably to this
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# module.
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#
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# J. David Ibanez implemented plural forms. Bruno Haible fixed some bugs.
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#
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# TODO:
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# - Lazy loading of .mo files.  Currently the entire catalog is loaded into
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#   memory, but that's probably bad for large translated programs.  Instead,
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#   the lexical sort of original strings in GNU .mo files should be exploited
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#   to do binary searches and lazy initializations.  Or you might want to use
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#   the undocumented double-hash algorithm for .mo files with hash tables, but
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#   you'll need to study the GNU gettext code to do this.
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#
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# - Support Solaris .mo file formats.  Unfortunately, we've been unable to
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#   find this format documented anywhere.
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import copy, os, re, struct, sys
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from errno import ENOENT
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__all__ = ['NullTranslations', 'GNUTranslations', 'Catalog',
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           'find', 'translation', 'install', 'textdomain', 'bindtextdomain',
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           'dgettext', 'dngettext', 'gettext', 'ngettext',
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           ]
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_default_localedir = os.path.join(sys.prefix, 'share', 'locale')
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def test(condition, true, false):
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    """
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    Implements the C expression:
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      condition ? true : false
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    Required to correctly interpret plural forms.
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    """
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    if condition:
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        return true
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    else:
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        return false
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def c2py(plural):
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    """Gets a C expression as used in PO files for plural forms and returns a
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    Python lambda function that implements an equivalent expression.
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    """
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    # Security check, allow only the "n" identifier
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    from StringIO import StringIO
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    import token, tokenize
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    tokens = tokenize.generate_tokens(StringIO(plural).readline)
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    try:
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        danger = [x for x in tokens if x[0] == token.NAME and x[1] != 'n']
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    except tokenize.TokenError:
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        raise ValueError, \
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              'plural forms expression error, maybe unbalanced parenthesis'
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    else:
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        if danger:
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            raise ValueError, 'plural forms expression could be dangerous'
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    # Replace some C operators by their Python equivalents
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    plural = plural.replace('&&', ' and ')
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    plural = plural.replace('||', ' or ')
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    expr = re.compile(r'\!([^=])')
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    plural = expr.sub(' not \\1', plural)
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    # Regular expression and replacement function used to transform
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    # "a?b:c" to "test(a,b,c)".
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    expr = re.compile(r'(.*?)\?(.*?):(.*)')
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    def repl(x):
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        return "test(%s, %s, %s)" % (x.group(1), x.group(2),
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                                     expr.sub(repl, x.group(3)))
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    # Code to transform the plural expression, taking care of parentheses
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    stack = ['']
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    for c in plural:
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        if c == '(':
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            stack.append('')
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        elif c == ')':
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            if len(stack) == 1:
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                # Actually, we never reach this code, because unbalanced
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                # parentheses get caught in the security check at the
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                # beginning.
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                raise ValueError, 'unbalanced parenthesis in plural form'
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            s = expr.sub(repl, stack.pop())
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            stack[-1] += '(%s)' % s
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        else:
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            stack[-1] += c
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    plural = expr.sub(repl, stack.pop())
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    return eval('lambda n: int(%s)' % plural)
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def _expand_lang(locale):
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    from locale import normalize
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    locale = normalize(locale)
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    COMPONENT_CODESET   = 1 << 0
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    COMPONENT_TERRITORY = 1 << 1
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    COMPONENT_MODIFIER  = 1 << 2
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    # split up the locale into its base components
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    mask = 0
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    pos = locale.find('@')
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    if pos >= 0:
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        modifier = locale[pos:]
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        locale = locale[:pos]
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        mask |= COMPONENT_MODIFIER
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    else:
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        modifier = ''
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    pos = locale.find('.')
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    if pos >= 0:
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        codeset = locale[pos:]
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        locale = locale[:pos]
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        mask |= COMPONENT_CODESET
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    else:
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        codeset = ''
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    pos = locale.find('_')
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    if pos >= 0:
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        territory = locale[pos:]
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        locale = locale[:pos]
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        mask |= COMPONENT_TERRITORY
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    else:
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        territory = ''
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    language = locale
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    ret = []
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    for i in range(mask+1):
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        if not (i & ~mask):  # if all components for this combo exist ...
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            val = language
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            if i & COMPONENT_TERRITORY: val += territory
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            if i & COMPONENT_CODESET:   val += codeset
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            if i & COMPONENT_MODIFIER:  val += modifier
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            ret.append(val)
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    ret.reverse()
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    return ret
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class NullTranslations:
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    def __init__(self, fp=None):
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        self._info = {}
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        self._charset = None
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        self._fallback = None
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        if fp is not None:
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            self._parse(fp)
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    def _parse(self, fp):
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        pass
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    def add_fallback(self, fallback):
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        if self._fallback:
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            self._fallback.add_fallback(fallback)
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        else:
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            self._fallback = fallback
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    def gettext(self, message):
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        if self._fallback:
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            return self._fallback.gettext(message)
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        return message
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    def ngettext(self, msgid1, msgid2, n):
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        if self._fallback:
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            return self._fallback.ngettext(msgid1, msgid2, n)
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        if n == 1:
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            return msgid1
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        else:
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            return msgid2
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    def ugettext(self, message):
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        if self._fallback:
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            return self._fallback.ugettext(message)
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        return unicode(message)
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    def ungettext(self, msgid1, msgid2, n):
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        if self._fallback:
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            return self._fallback.ungettext(msgid1, msgid2, n)
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        if n == 1:
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            return unicode(msgid1)
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   211
        else:
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            return unicode(msgid2)
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    def info(self):
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   215
        return self._info
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    def charset(self):
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        return self._charset
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    def install(self, unicode=False):
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        import __builtin__
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        __builtin__.__dict__['_'] = unicode and self.ugettext or self.gettext
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class GNUTranslations(NullTranslations):
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    # Magic number of .mo files
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    LE_MAGIC = 0x950412deL
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    BE_MAGIC = 0xde120495L
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    def _parse(self, fp):
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        """Override this method to support alternative .mo formats."""
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        unpack = struct.unpack
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        filename = getattr(fp, 'name', '')
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        # Parse the .mo file header, which consists of 5 little endian 32
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        # bit words.
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   236
        self._catalog = catalog = {}
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   237
        self.plural = lambda n: int(n != 1) # germanic plural by default
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        buf = fp.read()
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   239
        buflen = len(buf)
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   240
        # Are we big endian or little endian?
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   241
        magic = unpack('<I', buf[:4])[0]
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   242
        if magic == self.LE_MAGIC:
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   243
            version, msgcount, masteridx, transidx = unpack('<4I', buf[4:20])
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   244
            ii = '<II'
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   245
        elif magic == self.BE_MAGIC:
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   246
            version, msgcount, masteridx, transidx = unpack('>4I', buf[4:20])
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   247
            ii = '>II'
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   248
        else:
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   249
            raise IOError(0, 'Bad magic number', filename)
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        # Now put all messages from the .mo file buffer into the catalog
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   251
        # dictionary.
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   252
        for i in xrange(0, msgcount):
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   253
            mlen, moff = unpack(ii, buf[masteridx:masteridx+8])
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   254
            mend = moff + mlen
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diff changeset
   255
            tlen, toff = unpack(ii, buf[transidx:transidx+8])
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   256
            tend = toff + tlen
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   257
            if mend < buflen and tend < buflen:
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   258
                msg = buf[moff:mend]
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   259
                tmsg = buf[toff:tend]
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   260
            else:
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   261
                raise IOError(0, 'File is corrupt', filename)
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   262
            # See if we're looking at GNU .mo conventions for metadata
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   263
            if mlen == 0:
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   264
                # Catalog description
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   265
                # don't handle multi-lines fields here, and skip
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   266
                # lines which don't look like a header description
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                # (e.g. "header: value")
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   268
                lastk = k = None
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   269
                for item in tmsg.splitlines():
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   270
                    item = item.strip()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   271
                    if not item or not ':' in item:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   272
                        continue
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   273
                    k, v = item.split(':', 1)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   274
                    k = k.strip().lower()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   275
                    v = v.strip()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   276
                    self._info[k] = v
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   277
                    if k == 'content-type':
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   278
                        self._charset = v.split('charset=')[1]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   279
                    elif k == 'plural-forms':
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   280
                        v = v.split(';')
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   281
                        plural = v[1].split('plural=')[1]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   282
                        self.plural = c2py(plural)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   283
            # Note: we unconditionally convert both msgids and msgstrs to
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   284
            # Unicode using the character encoding specified in the charset
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   285
            # parameter of the Content-Type header.  The gettext documentation
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   286
            # strongly encourages msgids to be us-ascii, but some appliations
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   287
            # require alternative encodings (e.g. Zope's ZCML and ZPT).  For
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   288
            # traditional gettext applications, the msgid conversion will
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   289
            # cause no problems since us-ascii should always be a subset of
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   290
            # the charset encoding.  We may want to fall back to 8-bit msgids
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   291
            # if the Unicode conversion fails.
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   292
            if msg.find('\x00') >= 0:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   293
                # Plural forms
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   294
                msgid1, msgid2 = msg.split('\x00')
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   295
                tmsg = tmsg.split('\x00')
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   296
                if self._charset:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   297
                    msgid1 = unicode(msgid1, self._charset)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   298
                    tmsg = [unicode(x, self._charset) for x in tmsg]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   299
                for i in range(len(tmsg)):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   300
                    catalog[(msgid1, i)] = tmsg[i]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   301
            else:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   302
                if self._charset:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   303
                    msg = unicode(msg, self._charset)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   304
                    tmsg = unicode(tmsg, self._charset)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   305
                catalog[msg] = tmsg
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   306
            # advance to next entry in the seek tables
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   307
            masteridx += 8
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   308
            transidx += 8
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   309
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   310
    def gettext(self, message):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   311
        missing = object()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   312
        tmsg = self._catalog.get(message, missing)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   313
        if tmsg is missing:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   314
            if self._fallback:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   315
                return self._fallback.gettext(message)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   316
            return message
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   317
        # Encode the Unicode tmsg back to an 8-bit string, if possible
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   318
        if self._charset:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   319
            return tmsg.encode(self._charset)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   320
        return tmsg
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   321
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   322
    def ngettext(self, msgid1, msgid2, n):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   323
        try:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   324
            tmsg = self._catalog[(msgid1, self.plural(n))]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   325
            if self._charset:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   326
                return tmsg.encode(self._charset)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   327
            return tmsg
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   328
        except KeyError:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   329
            if self._fallback:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   330
                return self._fallback.ngettext(msgid1, msgid2, n)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   331
            if n == 1:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   332
                return msgid1
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   333
            else:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   334
                return msgid2
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   335
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   336
    def ugettext(self, message):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   337
        missing = object()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   338
        tmsg = self._catalog.get(message, missing)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   339
        if tmsg is missing:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   340
            if self._fallback:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   341
                return self._fallback.ugettext(message)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   342
            return unicode(message)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   343
        return tmsg
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   344
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   345
    def ungettext(self, msgid1, msgid2, n):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   346
        try:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   347
            tmsg = self._catalog[(msgid1, self.plural(n))]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   348
        except KeyError:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   349
            if self._fallback:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   350
                return self._fallback.ungettext(msgid1, msgid2, n)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   351
            if n == 1:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   352
                tmsg = unicode(msgid1)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   353
            else:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   354
                tmsg = unicode(msgid2)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   355
        return tmsg
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   356
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   357
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   358
# Locate a .mo file using the gettext strategy
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   359
def find(domain, localedir=None, languages=None, all=0):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   360
    # Get some reasonable defaults for arguments that were not supplied
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   361
    if localedir is None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   362
        localedir = _default_localedir
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   363
    if languages is None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   364
        languages = []
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   365
        for envar in ('LANGUAGE', 'LC_ALL', 'LC_MESSAGES', 'LANG'):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   366
            val = os.environ.get(envar)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   367
            if val:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   368
                languages = val.split(':')
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   369
                break
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   370
        if 'C' not in languages:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   371
            languages.append('C')
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   372
    # now normalize and expand the languages
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   373
    nelangs = []
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   374
    for lang in languages:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   375
        for nelang in _expand_lang(lang):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   376
            if nelang not in nelangs:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   377
                nelangs.append(nelang)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   378
    # select a language
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   379
    if all:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   380
        result = []
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   381
    else:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   382
        result = None
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   383
    for lang in nelangs:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   384
        if lang == 'C':
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   385
            break
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   386
        mofile = os.path.join(localedir, lang, 'LC_MESSAGES', '%s.mo' % domain)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   387
        if os.path.exists(mofile):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   388
            if all:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   389
                result.append(mofile)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   390
            else:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   391
                return mofile
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   392
    return result
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   393
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   394
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   395
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   396
# a mapping between absolute .mo file path and Translation object
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   397
_translations = {}
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   398
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   399
def translation(domain, localedir=None, languages=None,
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   400
                class_=None, fallback=False):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   401
    if class_ is None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   402
        class_ = GNUTranslations
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   403
    mofiles = find(domain, localedir, languages, all=1)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   404
    if not mofiles:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   405
        if fallback:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   406
            return NullTranslations()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   407
        raise IOError(ENOENT, 'No translation file found for domain', domain)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   408
    # TBD: do we need to worry about the file pointer getting collected?
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   409
    # Avoid opening, reading, and parsing the .mo file after it's been done
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   410
    # once.
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   411
    result = None
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   412
    for mofile in mofiles:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   413
        key = os.path.abspath(mofile)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   414
        t = _translations.get(key)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   415
        if t is None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   416
            t = _translations.setdefault(key, class_(open(mofile, 'rb')))
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   417
        # Copy the translation object to allow setting fallbacks.
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   418
        # All other instance data is shared with the cached object.
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   419
        t = copy.copy(t)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   420
        if result is None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   421
            result = t
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   422
        else:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   423
            result.add_fallback(t)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   424
    return result
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   425
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   426
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   427
def install(domain, localedir=None, unicode=False):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   428
    translation(domain, localedir, fallback=True).install(unicode)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   429
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   430
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   431
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   432
# a mapping b/w domains and locale directories
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   433
_localedirs = {}
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   434
# current global domain, `messages' used for compatibility w/ GNU gettext
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   435
_current_domain = 'messages'
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   436
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   437
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   438
def textdomain(domain=None):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   439
    global _current_domain
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   440
    if domain is not None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   441
        _current_domain = domain
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   442
    return _current_domain
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   443
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   444
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   445
def bindtextdomain(domain, localedir=None):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   446
    if localedir is not None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   447
        _localedirs[domain] = localedir
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   448
    return _localedirs.get(domain, _default_localedir)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   449
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   450
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   451
def dgettext(domain, message):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   452
    try:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   453
        t = translation(domain, _localedirs.get(domain, None))
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   454
    except IOError:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   455
        return message
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   456
    return t.gettext(message)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   457
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   458
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   459
def dngettext(domain, msgid1, msgid2, n):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   460
    try:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   461
        t = translation(domain, _localedirs.get(domain, None))
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   462
    except IOError:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   463
        if n == 1:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   464
            return msgid1
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   465
        else:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   466
            return msgid2
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   467
    return t.ngettext(msgid1, msgid2, n)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   468
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   469
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   470
def gettext(message):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   471
    return dgettext(_current_domain, message)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   472
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   473
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   474
def ngettext(msgid1, msgid2, n):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   475
    return dngettext(_current_domain, msgid1, msgid2, n)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   476
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   477
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   478
# dcgettext() has been deemed unnecessary and is not implemented.
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   479
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   480
# James Henstridge's Catalog constructor from GNOME gettext.  Documented usage
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   481
# was:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   482
#
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   483
#    import gettext
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   484
#    cat = gettext.Catalog(PACKAGE, localedir=LOCALEDIR)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   485
#    _ = cat.gettext
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   486
#    print _('Hello World')
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   487
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   488
# The resulting catalog object currently don't support access through a
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   489
# dictionary API, which was supported (but apparently unused) in GNOME
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   490
# gettext.
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   491
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   492
Catalog = translation