models.py 文件源码

def get_request_language_preference(request):
    """
    Collect language preferences from request.LANGUAGE_CODE, the HTTP
    Accept-Language header, and settings.LANGUAGE_CODE, and return a list of
    languages in preference order.
    """
    all_langs = []
    if hasattr(request, 'LANGUAGE_CODE'):
        all_langs.append(request.LANGUAGE_CODE)
    all_langs.extend(parse_accept_header(request.META.get('HTTP_ACCEPT_LANGUAGE', '')))
    all_langs.append(settings.LANGUAGE_CODE)

    # Remove duplicates while preserving order. The list of languages should be
    # quite short, so the inefficiency of this method should not matter.
    # Famous last words.
    langs = []
    for lang in all_langs:
        if lang not in langs:
            langs.append(lang)
    return langs