mirror of
https://github.com/python/cpython.git
synced 2024-11-24 10:24:35 +08:00
114 lines
2.4 KiB
Python
Executable File
114 lines
2.4 KiB
Python
Executable File
#!/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 (str.translate(input, rot13_map), len(input))
|
|
|
|
def decode(self, input, errors='strict'):
|
|
return (str.translate(input, rot13_map), len(input))
|
|
|
|
class IncrementalEncoder(codecs.IncrementalEncoder):
|
|
def encode(self, input, final=False):
|
|
return str.translate(input, rot13_map)
|
|
|
|
class IncrementalDecoder(codecs.IncrementalDecoder):
|
|
def decode(self, input, final=False):
|
|
return str.translate(input, 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)
|