defaultfilters.py 文件源码

def stringfilter(func):
    """
    Decorator for filters which should only receive unicode objects. The object
    passed as the first positional argument will be converted to a unicode
    object.
    """
    def _dec(*args, **kwargs):
        if args:
            args = list(args)
            args[0] = force_text(args[0])
            if (isinstance(args[0], SafeData) and
                    getattr(_dec._decorated_function, 'is_safe', False)):
                return mark_safe(func(*args, **kwargs))
        return func(*args, **kwargs)

    # Include a reference to the real function (used to check original
    # arguments by the template parser, and to bear the 'is_safe' attribute
    # when multiple decorators are applied).
    _dec._decorated_function = getattr(func, '_decorated_function', func)

    return wraps(func)(_dec)


###################
# STRINGS         #
###################