formatters.py 文件源码

def __call__(self, *args):
        """
        Returning :class:`FormattingString` instance for given parameters.

        Return evaluated terminal capability (self), receiving arguments
        ``*args``, followed by the terminating sequence (self.normal) into
        a :class:`FormattingString` capable of being called.

        :rtype: :class:`FormattingString` or :class:`NullCallableString`
        """
        try:
            # Re-encode the cap, because tparm() takes a bytestring in Python
            # 3. However, appear to be a plain Unicode string otherwise so
            # concats work.
            attr = curses.tparm(self.encode('latin1'), *args).decode('latin1')
            return FormattingString(attr, self._normal)
        except TypeError as err:
            # If the first non-int (i.e. incorrect) arg was a string, suggest
            # something intelligent:
            if len(args) and isinstance(args[0], six.string_types):
                raise TypeError(
                    "A native or nonexistent capability template, %r received"
                    " invalid argument %r: %s. You probably misspelled a"
                    " formatting call like `bright_red'" % (
                        self._name, args, err))
            # Somebody passed a non-string; I don't feel confident
            # guessing what they were trying to do.
            raise
        except curses.error as err:
            # ignore 'tparm() returned NULL', you won't get any styling,
            # even if does_styling is True. This happens on win32 platforms
            # with http://www.lfd.uci.edu/~gohlke/pythonlibs/#curses installed
            if "tparm() returned NULL" not in six.text_type(err):
                raise
            return NullCallableString()