97 lines
2.3 KiB
Python
97 lines
2.3 KiB
Python
# coding=utf-8
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#
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# Copyright (C) 2007 Martin Owens
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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"""
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Python barcode renderer for Code39 Extended barcodes. Designed for Inkscape.
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"""
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from .Code39 import Code39
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encode = list("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
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charmap = {}
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i = 0
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for char in encode:
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charmap[char] = i
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i += 1
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def get_map(array):
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"""Extended encoding maps for full ASCII Code93"""
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result = {}
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for y, x in enumerate(array):
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result[chr(x)] = encode[y]
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return result
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# MapA is eclectic, but B, C, D are all ASCII ranges
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mapA = get_map(
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[
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27,
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28,
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29,
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30,
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31,
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59,
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60,
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61,
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62,
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63,
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91,
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92,
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93,
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94,
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95,
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123,
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124,
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125,
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126,
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127,
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0,
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64,
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96,
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127,
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127,
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127,
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]
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) # %
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mapB = get_map(range(1, 26)) # $
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mapC = get_map(range(33, 58)) # /
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mapD = get_map(range(97, 122)) # +
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class Code39Ext(Code39):
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"""Render Code39 Barcodes"""
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def encode(self, text):
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# We are only going to extend the Code39 barcodes
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result = ""
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for character in text:
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if character in mapA:
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character = "%" + mapA[character]
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elif character in mapB:
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character = "$" + mapB[character]
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elif character in mapC:
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character = "/" + mapC[character]
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elif character in mapD:
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character = "+" + mapD[character]
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result = result + character
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return Code39.encode(self, result)
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