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Python Source  |  2010-03-06  |  2.6 KB  |  119 lines
  1. #!/usr/bin/env python
  2. """ Python Character Mapping Codec for ROT13.
  3.  
  4.     See http://ucsub.colorado.edu/~kominek/rot13/ for details.
  5.  
  6.     Written by Marc-Andre Lemburg (mal@lemburg.com).
  7.  
  8. """#"
  9.  
  10. import codecs
  11.  
  12. ### Codec APIs
  13.  
  14. class Codec(codecs.Codec):
  15.  
  16.     def encode(self,input,errors='strict'):
  17.         return codecs.charmap_encode(input,errors,encoding_map)
  18.  
  19.     def decode(self,input,errors='strict'):
  20.         return codecs.charmap_decode(input,errors,decoding_map)
  21.  
  22. class IncrementalEncoder(codecs.IncrementalEncoder):
  23.     def encode(self, input, final=False):
  24.         return codecs.charmap_encode(input,self.errors,encoding_map)[0]
  25.  
  26. class IncrementalDecoder(codecs.IncrementalDecoder):
  27.     def decode(self, input, final=False):
  28.         return codecs.charmap_decode(input,self.errors,decoding_map)[0]
  29.  
  30. class StreamWriter(Codec,codecs.StreamWriter):
  31.     pass
  32.  
  33. class StreamReader(Codec,codecs.StreamReader):
  34.     pass
  35.  
  36. ### encodings module API
  37.  
  38. def getregentry():
  39.     return codecs.CodecInfo(
  40.         name='rot-13',
  41.         encode=Codec().encode,
  42.         decode=Codec().decode,
  43.         incrementalencoder=IncrementalEncoder,
  44.         incrementaldecoder=IncrementalDecoder,
  45.         streamwriter=StreamWriter,
  46.         streamreader=StreamReader,
  47.     )
  48.  
  49. ### Decoding Map
  50.  
  51. decoding_map = codecs.make_identity_dict(range(256))
  52. decoding_map.update({
  53.    0x0041: 0x004e,
  54.    0x0042: 0x004f,
  55.    0x0043: 0x0050,
  56.    0x0044: 0x0051,
  57.    0x0045: 0x0052,
  58.    0x0046: 0x0053,
  59.    0x0047: 0x0054,
  60.    0x0048: 0x0055,
  61.    0x0049: 0x0056,
  62.    0x004a: 0x0057,
  63.    0x004b: 0x0058,
  64.    0x004c: 0x0059,
  65.    0x004d: 0x005a,
  66.    0x004e: 0x0041,
  67.    0x004f: 0x0042,
  68.    0x0050: 0x0043,
  69.    0x0051: 0x0044,
  70.    0x0052: 0x0045,
  71.    0x0053: 0x0046,
  72.    0x0054: 0x0047,
  73.    0x0055: 0x0048,
  74.    0x0056: 0x0049,
  75.    0x0057: 0x004a,
  76.    0x0058: 0x004b,
  77.    0x0059: 0x004c,
  78.    0x005a: 0x004d,
  79.    0x0061: 0x006e,
  80.    0x0062: 0x006f,
  81.    0x0063: 0x0070,
  82.    0x0064: 0x0071,
  83.    0x0065: 0x0072,
  84.    0x0066: 0x0073,
  85.    0x0067: 0x0074,
  86.    0x0068: 0x0075,
  87.    0x0069: 0x0076,
  88.    0x006a: 0x0077,
  89.    0x006b: 0x0078,
  90.    0x006c: 0x0079,
  91.    0x006d: 0x007a,
  92.    0x006e: 0x0061,
  93.    0x006f: 0x0062,
  94.    0x0070: 0x0063,
  95.    0x0071: 0x0064,
  96.    0x0072: 0x0065,
  97.    0x0073: 0x0066,
  98.    0x0074: 0x0067,
  99.    0x0075: 0x0068,
  100.    0x0076: 0x0069,
  101.    0x0077: 0x006a,
  102.    0x0078: 0x006b,
  103.    0x0079: 0x006c,
  104.    0x007a: 0x006d,
  105. })
  106.  
  107. ### Encoding Map
  108.  
  109. encoding_map = codecs.make_encoding_map(decoding_map)
  110.  
  111. ### Filter API
  112.  
  113. def rot13(infile, outfile):
  114.     outfile.write(infile.read().encode('rot-13'))
  115.  
  116. if __name__ == '__main__':
  117.     import sys
  118.     rot13(sys.stdin, sys.stdout)
  119.