def javascript_catalog(request, domain='djangojs', packages=None):
    """
    Returns the selected language catalog as a javascript library.

    Receives the list of packages to check for translations in the
    packages parameter either from an infodict or as a +-delimited
    string from the request. Default is 'django.conf'.

    Additionally you can override the gettext domain for this view,
    but usually you don't want to do that, as JavaScript messages
    go to the djangojs domain. But this might be needed if you
    deliver your JavaScript source from Django templates.
    """
    if request.GET:
        if 'language' in request.GET:
            if check_for_language(request.GET['language']):
                activate(request.GET['language'])
    if packages is None:
        packages = ['django.conf']
    if type(packages) in (str, unicode):
        packages = packages.split('+')
    packages = [p for p in packages if p == 'django.conf' or p in settings.INSTALLED_APPS]
    default_locale = to_locale(settings.LANGUAGE_CODE)
    locale = to_locale(get_language())
    t = {}
    paths = []
    # first load all english languages files for defaults
    for package in packages:
        p = importlib.import_module(package)
        path = os.path.join(os.path.dirname(p.__file__), 'locale')
        paths.append(path)
        try:
            catalog = gettext_module.translation(domain, path, ['en'])
            t.update(catalog._catalog)
        except __HOLE__:
            # 'en' catalog was missing. This is harmless.
            pass
    # next load the settings.LANGUAGE_CODE translations if it isn't english
    if default_locale != 'en':
        for path in paths:
            try:
                catalog = gettext_module.translation(domain, path, [default_locale])
            except IOError:
                catalog = None
            if catalog is not None:
                t.update(catalog._catalog)
    # last load the currently selected language, if it isn't identical to the default.
    if locale != default_locale:
        for path in paths:
            try:
                catalog = gettext_module.translation(domain, path, [locale])
            except IOError:
                catalog = None
            if catalog is not None:
                t.update(catalog._catalog)
    src = [LibHead]
    plural = None
    if '' in t:
        for l in t[''].split('\n'):
            if l.startswith('Plural-Forms:'):
                plural = l.split(':',1)[1].strip()
    if plural is not None:
        # this should actually be a compiled function of a typical plural-form:
        # Plural-Forms: nplurals=3; plural=n%10==1 && n%100!=11 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2;
        plural = [el.strip() for el in plural.split(';') if el.strip().startswith('plural=')][0].split('=',1)[1]
        src.append(PluralIdx % plural)
    else:
        src.append(SimplePlural)
    csrc = []
    pdict = {}
    for k, v in t.items():
        if k == '':
            continue
        if type(k) in (str, unicode):
            csrc.append("catalog['%s'] = '%s';\n" % (javascript_quote(k), javascript_quote(v)))
        elif type(k) == tuple:
            if k[0] not in pdict:
                pdict[k[0]] = k[1]
            else:
                pdict[k[0]] = max(k[1], pdict[k[0]])
            csrc.append("catalog['%s'][%d] = '%s';\n" % (javascript_quote(k[0]), k[1], javascript_quote(v)))
        else:
            raise TypeError, k
    csrc.sort()
    for k,v in pdict.items():
        src.append("catalog['%s'] = [%s];\n" % (javascript_quote(k), ','.join(["''"]*(v+1))))
    src.extend(csrc)
    src.append(LibFoot)
    src.append(InterPolate)
    src = ''.join(src)
    return http.HttpResponse(src, 'text/javascript')
dataset/ETHPy150Open CollabQ/CollabQ/vendor/django/views/i18n.py/javascript_catalog