#!/usr/bin/env python

""" Python Character Mapping Codec for ROT13.

This codec de/encodes from str to str.

Written by Marc-Andre Lemburg (mal@lemburg.com).

"""

import codecs

### Codec APIs

class Codec(codecs.Codec):

    def encode(self, input, errors='strict'):

        return (input.translate(rot13_map), len(input))

    def decode(self, input, errors='strict'):

        return (input.translate(rot13_map), len(input))

class IncrementalEncoder(codecs.IncrementalEncoder):

    def encode(self, input, final=False):

        return input.translate(rot13_map)

class IncrementalDecoder(codecs.IncrementalDecoder):

    def decode(self, input, final=False):

        return input.translate(rot13_map)

class StreamWriter(Codec,codecs.StreamWriter):

    pass

class StreamReader(Codec,codecs.StreamReader):

    pass

### encodings module API

def getregentry():

    return codecs.CodecInfo(

        name='rot-13',

        encode=Codec().encode,

        decode=Codec().decode,

        incrementalencoder=IncrementalEncoder,

        incrementaldecoder=IncrementalDecoder,

        streamwriter=StreamWriter,

        streamreader=StreamReader,

        _is_text_encoding=False,

    )

### Map

rot13_map = codecs.make_identity_dict(range(256))

rot13_map.update({

   0x0041: 0x004e,

   0x0042: 0x004f,

   0x0043: 0x0050,

   0x0044: 0x0051,

   0x0045: 0x0052,

   0x0046: 0x0053,

   0x0047: 0x0054,

   0x0048: 0x0055,

   0x0049: 0x0056,

   0x004a: 0x0057,

   0x004b: 0x0058,

   0x004c: 0x0059,

   0x004d: 0x005a,

   0x004e: 0x0041,

   0x004f: 0x0042,

   0x0050: 0x0043,

   0x0051: 0x0044,

   0x0052: 0x0045,

   0x0053: 0x0046,

   0x0054: 0x0047,

   0x0055: 0x0048,

   0x0056: 0x0049,

   0x0057: 0x004a,

   0x0058: 0x004b,

   0x0059: 0x004c,

   0x005a: 0x004d,

   0x0061: 0x006e,

   0x0062: 0x006f,

   0x0063: 0x0070,

   0x0064: 0x0071,

   0x0065: 0x0072,

   0x0066: 0x0073,

   0x0067: 0x0074,

   0x0068: 0x0075,

   0x0069: 0x0076,

   0x006a: 0x0077,

   0x006b: 0x0078,

   0x006c: 0x0079,

   0x006d: 0x007a,

   0x006e: 0x0061,

   0x006f: 0x0062,

   0x0070: 0x0063,

   0x0071: 0x0064,

   0x0072: 0x0065,

   0x0073: 0x0066,

   0x0074: 0x0067,

   0x0075: 0x0068,

   0x0076: 0x0069,

   0x0077: 0x006a,

   0x0078: 0x006b,

   0x0079: 0x006c,

   0x007a: 0x006d,

})

### Filter API

def rot13(infile, outfile):

    outfile.write(codecs.encode(infile.read(), 'rot-13'))

if __name__ == '__main__':

    import sys

    rot13(sys.stdin, sys.stdout)