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# coding=utf-8
#
# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
"""
Python barcode renderer for Code39 Extended barcodes. Designed for Inkscape.
"""
from .Code39 import Code39
encode = list("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
charmap = {}
i = 0
for char in encode:
charmap[char] = i
i += 1
def get_map(array):
"""Extended encoding maps for full ASCII Code93"""
result = {}
for y, x in enumerate(array):
result[chr(x)] = encode[y]
return result
# MapA is eclectic, but B, C, D are all ASCII ranges
mapA = get_map(
[
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 = get_map(range(1, 26)) # $
mapC = get_map(range(33, 58)) # /
mapD = get_map(range(97, 122)) # +
class Code39Ext(Code39):
"""Render Code39 Barcodes"""
def encode(self, text):
# We are only going to extend the Code39 barcodes
result = ""
for character in text:
if character in mapA:
character = "%" + mapA[character]
elif character in mapB:
character = "$" + mapB[character]
elif character in mapC:
character = "/" + mapC[character]
elif character in mapD:
character = "+" + mapD[character]
result = result + character
return Code39.encode(self, result)
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