#!/usr/local/bin/python
# -*- coding: iso-8859-1 -*-
#
#   idna
#
#   Oliver Fromme  <olli@fromme.com>  <olli@secnetix.de>
#
#   This Python program converts Latin1 domain names
#   to their IDNA representation and vice versa.
#   See RFC 3490 and RFC 3492.
#
#   Please refer to the excellent Python docs for details!
#   (Especially, of course, the Python Library Reference.)
#
#   http://www.python.org/doc/current/
#

import sys

if not hasattr(sys, "hexversion") or sys.hexversion < 0x20300f0:
	sys.stderr.write("idna: Sorry, need at least Python 2.3.\n")
	sys.exit(1)

#
#   This function converts a single component "s"
#   from one encoding to another.
#

def convert (s, dec, enc):
	if not s:
		return ""
	try:
		return s.decode(dec).encode(enc)
	except:
		return "<CANT-CONVERT-%s-TO-%s>" % (dec, enc)

#
#   For a complete hostname, find out the conversion direction,
#   perform the conversion and convert the result.
#

def convert_name (name):
	src, dst = "LATIN1", "IDNA"
	if name.startswith("xn--") or name.find(".xn--") >= 0:
		src, dst = dst, src
	return ".".join(map(lambda s: convert(s, src, dst), name.split(".")))

#
#   If there are any command line arguments, convert each of them.
#   Otherwise read names from stdin, separated by whitespace,
#   and convert each of them.
#
#   In any case, the results are printed one per line.
#

if len(sys.argv) > 1:

	for i in sys.argv[1:]:
		print convert_name(i)

else:

	for line in sys.stdin:
		for i in line.strip().split():
			if i:
				print convert_name(i)

#--