#!/usr/bin/env python
#
# Copyright (C) 2008 David A. Helder
#
# GNU General Public Licence (GPL)
# 
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA

import sys
import string
import re

name_to_number_map = {}
number_to_name_map = {}


def name_to_number(name):
    return name_to_number_map.get(name.lower(), None)


def number_to_name(number):
    try:
        n = int(number)
    except ValueError:
        return None
    return number_to_name_map.get(n, None)


def address_to_namber(addr):

    parts = string.split(addr, '.')
    if len(parts) != 4:
        return None

    addr0 = number_to_name(parts[0])
    if addr0 == None:
        return None
    addr1 = number_to_name(parts[1])
    if addr1 == None:
        return None
    addr2 = number_to_name(parts[2])
    if addr2 == None:
        return None
    addr3 = number_to_name(parts[3])
    if addr3 == None:
        return None

    addr = addr0 + "." + addr1 + "." + \
           addr2 + "." + addr3

    return addr


def namber_to_address(name):

    parts = string.split(name, '.')
    if len(parts) != 4:
        return None

    addr0 = name_to_number(parts[0])
    if addr0 == None:
        return None
    addr1 = name_to_number(parts[1])
    if addr1 == None:
        return None
    addr2 = name_to_number(parts[2])
    if addr2 == None:
        return None
    addr3 = name_to_number(parts[3])
    if addr3 == None:
        return None

    addr = "%d.%d.%d.%d" % (addr0, addr1, addr2, addr3)

    return addr


def namber_loadfile(file):
    f = open(file, "r")
    count = 0
    linenum = 0
    name_to_number_map.clear()
    number_to_name_map.clear()
    for line in f.readlines():
        linenum += 1
        mo = re.match("^\s*([a-z_]+)", line)
        if mo:
            name = mo.group(0)
            if count < 256:
                if name_to_number_map.has_key(name):
                    print "Warning: duplicate name \"%s\" at line %d" \
                      % (name, linenum)
                    continue
                name_to_number_map[name]  = count
                number_to_name_map[count] = name
                count += 1
            else:
                print "Warning: extra name \"%s\" at line %d" \
                      % (name, linenum)

    if count != 256:
        print "%d names loaded.  Adding more names..." % count
    f.close()
    while count < 256:
        name = "n" + str(count)
        name_to_number_map[name] = count
        number_to_name_map[count]  = name
        count += 1


def main():
    namber_loadfile("nambers.txt")

    if len(sys.argv) == 2:
        arg = sys.argv[1]
        if ord(arg[0]) >= ord('0') and \
           ord(arg[0]) <= ord('9'):
            name = address_to_namber(arg)
            if name:
                print name
            else:
                print "Bad address: %s" % arg

        else:
            addr = namber_to_address(arg)
            if addr:
                print addr
            else:
                print "Bad namber: %s" % arg

if __name__ == '__main__':
    main()