How to use the birdears.urwid.display_common.AttrSpec function in birdears

"""
        basic = AttrSpec(foreground, background, 16)

        if type(mono) == tuple:
            # old style of specifying mono attributes was to put them
            # in a tuple.  convert to comma-separated string
            mono = ",".join(mono)
        if mono is None:
            mono = DEFAULT
        mono = AttrSpec(mono, DEFAULT, 1)

        if foreground_high is None:
            foreground_high = foreground
        if background_high is None:
            background_high = background
        high_256 = AttrSpec(foreground_high, background_high, 256)

        # 'hX' where X > 15 are different in 88/256 color, use
        # basic colors for 88-color mode if high colors are specified
        # in this way (also avoids crash when X > 87)
        def large_h(desc):
            if not desc.startswith('h'):
                return False
            if ',' in desc:
            	desc = desc.split(',',1)[0]
            num = int(desc[1:], 10)
            return num > 15
        if large_h(foreground_high) or large_h(background_high):
            high_88 = basic
        else:
            high_88 = AttrSpec(foreground_high, background_high, 88)

high_256 = AttrSpec(foreground_high, background_high, 256)

        # 'hX' where X > 15 are different in 88/256 color, use
        # basic colors for 88-color mode if high colors are specified
        # in this way (also avoids crash when X > 87)
        def large_h(desc):
            if not desc.startswith('h'):
                return False
            if ',' in desc:
            	desc = desc.split(',',1)[0]
            num = int(desc[1:], 10)
            return num > 15
        if large_h(foreground_high) or large_h(background_high):
            high_88 = basic
        else:
            high_88 = AttrSpec(foreground_high, background_high, 88)

        signals.emit_signal(self, UPDATE_PALETTE_ENTRY,
            name, basic, mono, high_88, high_256)
        self._palette[name] = (basic, mono, high_88, high_256)

def rgb_values(n):
            if self.colors == 16:
                aspec = AttrSpec("h%d"%n, "", 256)
            else:
                aspec = AttrSpec("h%d"%n, "", self.colors)
            return aspec.get_rgb_values()[:3]

def _setattr(self, a):
        if a is None:
            self.s.attrset(0)
            return
        elif not isinstance(a, AttrSpec):
            p = self._palette.get(a, (AttrSpec('default', 'default'),))
            a = p[0]

        if self.has_color:
            if a.foreground_basic:
                if a.foreground_number >= 8:
                    fg = a.foreground_number - 8
                else:
                    fg = a.foreground_number
            else:
                fg = 7

            if a.background_basic:
                bg = a.background_number
            else:
                bg = 0

'#fcc' (100% red, 80% green, 80% blue)
            'g40' (40% gray, decimal), 'g#cc' (80% gray, hex),
            '#000', 'g0', 'g#00' (black),
            '#fff', 'g100', 'g#ff' (white)
            'h8' (color number 8), 'h255' (color number 255)

            None = use foreground parameter value

        background_high -- a string containing the background color,
        standard background colors (see "Background colors" above)
        or high-colors (see "High-color example values" above)
        may be used

            None = use background parameter value
        """
        basic = AttrSpec(foreground, background, 16)

        if type(mono) == tuple:
            # old style of specifying mono attributes was to put them
            # in a tuple.  convert to comma-separated string
            mono = ",".join(mono)
        if mono is None:
            mono = DEFAULT
        mono = AttrSpec(mono, DEFAULT, 1)

        if foreground_high is None:
            foreground_high = foreground
        if background_high is None:
            background_high = background
        high_256 = AttrSpec(foreground_high, background_high, 256)

        # 'hX' where X > 15 are different in 88/256 color, use

def _setattr(self, a):
        if a is None:
            self.s.attrset(0)
            return
        elif not isinstance(a, AttrSpec):
            p = self._palette.get(a, (AttrSpec('default', 'default'),))
            a = p[0]

        if self.has_color:
            if a.foreground_basic:
                if a.foreground_number >= 8:
                    fg = a.foreground_number - 8
                else:
                    fg = a.foreground_number
            else:
                fg = 7

            if a.background_basic:
                bg = a.background_number
            else:
                bg = 0

def rgb_values(n):
            if self.colors == 16:
                aspec = AttrSpec("h%d"%n, "", 256)
            else:
                aspec = AttrSpec("h%d"%n, "", self.colors)
            return aspec.get_rgb_values()[:3]

def using_standout_or_underline(a):
            a = self._pal_attrspec.get(a, a)
            return isinstance(a, AttrSpec) and (a.standout or a.underline)