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Code39Ext.py

00001 '''
Copyright (C) 2007 Martin Owens

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 Code39

encode = list('ABCDEFGHIJKLMNOPQRSTUVWXYZ')

map = {}

i = 0
for char in encode:
      map[char] = i
      i = i + 1

# Extended encoding maps for full ASCII Code93
def getMap(array):
      result = {}
      y = 0
      for x in array:
            result[chr(x)] = encode[y]
            y = y + 1

      return result;

# MapA is eclectic, but B, C, D are all ASCII ranges
mapA = getMap([27,28,29,30,31,59,60,61,62,63,91,92,93,94,95,123,124,125,126,127,0,64,96,127,127,127]) # %
mapB = getMap(range(1, 26)) # $
mapC = getMap(range(33, 58)) # /
mapD = getMap(range(97, 122)) # +

00046 class Object(Code39.Object):
      def encode(self, text):
            # We are only going to extend the Code39 barcodes
            result = ''
            for char in text:
                  if mapA.has_key(char):
                        char = '%' + mapA[char]
                  elif mapB.has_key(char):
                        char = '$' + mapB[char]
                  elif mapC.has_key(char):
                        char = '/' + mapC[char]
                  elif mapD.has_key(char):
                        char = '+' + mapD[char]
                  result = result + char

            return Code39.Object.encode(self, result);


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