def validate(self, string, index):
        # one approach is to break the string into segments
        # and test each segment for proper content
        state = qtg.QValidator.Acceptable
        seg1 = string[0:2]
        dash1 = string[2:3]
        seg2 = string[3:6]
        dash2 = string[6:7]
        seg3 = string[7:11]
        seg4 = string[11:12]

        if not all([char in self.valid_letters for char in seg1 + seg4]):
            state = qtg.QValidator.Invalid
        elif not all([char.isdigit() for char in seg2 + seg3]):
            state = qtg.QValidator.Invalid
        elif not all([char == '-' for char in dash1 + dash2]):
            state = qtg.QValidator.Invalid
        elif len(string) > 12:
            state = qtg.QValidator.Invalid
        elif not all([seg1, dash1, seg2, dash2, seg3, seg4]):
            state = qtg.QValidator.Intermediate

        return (state, string, index) 

def validate(self, original, offset):  # pylint:disable=W0613
            """Fixes original text and resets cursor to end of line."""

            filtered = self.fixup(original)
            return QtGui.QValidator.Acceptable, filtered, len(filtered) 

def validate(self, string, index):
        if string in self.choices:
            state = qtg.QValidator.Acceptable
        elif any([v.startswith(string) for v in self.choices]):
            state = qtg.QValidator.Intermediate
        else:
            state = qtg.QValidator.Invalid
        return (state, string, index) 

def validate(self, string, index):
        octets = string.split('.')
        if len(octets) > 4:
            state = qtg.QValidator.Invalid
        elif not all([x.isdigit() for x in octets if x != '']):
            state = qtg.QValidator.Invalid
        elif not all([0 <= int(x) <= 255 for x in octets if x != '']):
            state = qtg.QValidator.Invalid
        elif len(octets) < 4:
            state = qtg.QValidator.Intermediate
        elif any([x == '' for x in octets]):
            state = qtg.QValidator.Intermediate
        else:
            state = qtg.QValidator.Acceptable
        return (state, string, index) 

def select_type_validator(tp: click.types.ParamType)-> QtGui.QValidator:
    """ select the right validator for `tp`"""
    if isinstance(tp, click.types.IntParamType):
        return QtGui.QIntValidator()
    elif isinstance(tp, click.types.FloatParamType):
        return QtGui.QDoubleValidator()
    return None