def valid_glob()

in lambda/netaddr/ip/glob.py [0:0]

• 38 lines of code
• 18 McCabe index (conditional complexity)

def valid_glob(ipglob):
    """
    :param ipglob: An IP address range in a glob-style format.

    :return: ``True`` if IP range glob is valid, ``False`` otherwise.
    """
    #TODO: Add support for abbreviated ipglobs.
    #TODO: e.g. 192.0.*.* == 192.0.*
    #TODO:      *.*.*.*     == *
    #TODO: Add strict flag to enable verbose ipglob checking.
    if not _is_str(ipglob):
        return False

    seen_hyphen = False
    seen_asterisk = False

    octets = ipglob.split('.')

    if len(octets) != 4:
        return False

    for octet in octets:
        if '-' in octet:
            if seen_hyphen:
                return False
            seen_hyphen = True
            if seen_asterisk:
                #   Asterisks cannot precede hyphenated octets.
                return False
            try:
                (octet1, octet2) = [int(i) for i in octet.split('-')]
            except ValueError:
                return False
            if octet1 >= octet2:
                return False
            if not 0 <= octet1 <= 254:
                return False
            if not 1 <= octet2 <= 255:
                return False
        elif octet == '*':
            seen_asterisk = True
        else:
            if seen_hyphen is True:
                return False
            if seen_asterisk is True:
                return False
            try:
                if not 0 <= int(octet) <= 255:
                    return False
            except ValueError:
                return False
    return True