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# coding=utf-8
#
# Authored by Martin Owens <doctormo@gmail.com>
# Debugged by Ralf Heinecke & Martin Siepmann 2007-09-07
# Horst Schottky 2010-02-27
#
# 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, USA.
#
"""
Renderer for Code128/EAN128 codes. Designed for use with Inkscape.
"""
import re
from .Base import Barcode
CODE_MAP = [
'11011001100', '11001101100', '11001100110', '10010011000', '10010001100',
'10001001100', '10011001000', '10011000100', '10001100100', '11001001000',
'11001000100', '11000100100', '10110011100', '10011011100', '10011001110',
'10111001100', '10011101100', '10011100110', '11001110010', '11001011100',
'11001001110', '11011100100', '11001110100', '11101101110', '11101001100',
'11100101100', '11100100110', '11101100100', '11100110100', '11100110010',
'11011011000', '11011000110', '11000110110', '10100011000', '10001011000',
'10001000110', '10110001000', '10001101000', '10001100010', '11010001000',
'11000101000', '11000100010', '10110111000', '10110001110', '10001101110',
'10111011000', '10111000110', '10001110110', '11101110110', '11010001110',
'11000101110', '11011101000', '11011100010', '11011101110', '11101011000',
'11101000110', '11100010110', '11101101000', '11101100010', '11100011010',
'11101111010', '11001000010', '11110001010', '10100110000', '10100001100',
'10010110000', '10010000110', '10000101100', '10000100110', '10110010000',
'10110000100', '10011010000', '10011000010', '10000110100', '10000110010',
'11000010010', '11001010000', '11110111010', '11000010100', '10001111010',
'10100111100', '10010111100', '10010011110', '10111100100', '10011110100',
'10011110010', '11110100100', '11110010100', '11110010010', '11011011110',
'11011110110', '11110110110', '10101111000', '10100011110', '10001011110',
'10111101000', '10111100010', '11110101000', '11110100010', '10111011110',
'10111101110', '11101011110', '11110101110', '11010000100', '11010010000',
'11010011100', '11000111010', '11']
def map_extra(data, chars):
"""Maps the data into the chars"""
result = list(data)
for char in chars:
result.append(chr(char))
result.append('FNC3')
result.append('FNC2')
result.append('SHIFT')
return result
# The map_extra method is used to slim down the amount
# of pre code and instead we generate the lists
CHAR_AB = list(" !\"#$%&\'()*+,-./0123456789:;<=>?@"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_")
CHAR_A = map_extra(CHAR_AB, range(0, 31)) # Offset 64
CHAR_B = map_extra(CHAR_AB, range(96, 125)) # Offset -32
class Code128(Barcode):
"""Main barcode object, generates the encoding bits here"""
def encode(self, text):
blocks = []
block = ''
# Split up into sections of numbers, or characters
# This makes sure that all the characters are encoded
# In the best way possible for Code128
for datum in re.findall(r'(?:(?:\d\d){2,})|(?:^\d\d)|.', text):
if len(datum) == 1:
block = block + datum
else:
if block:
blocks.append(self.best_block(block))
block = ''
blocks.append(['C', datum])
if block:
blocks.append(self.best_block(block))
block = ''
return self.encode_blocks(blocks)
def best_block(self, block):
"""If this has lower case then select B over A"""
if block.upper() == block:
return ['A', block]
return ['B', block]
def encode_blocks(self, blocks):
"""Encode the given blocks into A, B or C codes"""
encode = ''
total = 0
pos = 0
for block in blocks:
b_set = block[0]
datum = block[1]
# POS : 0, 1
# A : 101, 103
# B : 100, 104
# C : 99, 105
num = 0
if b_set == 'A':
num = 103
elif b_set == 'B':
num = 104
elif b_set == 'C':
num = 105
i = pos
if pos:
num = 204 - num
else:
i = 1
total = total + num * i
encode = encode + CODE_MAP[num]
pos += 1
if b_set == 'A' or b_set == 'B':
chars = CHAR_B
if b_set == 'A':
chars = CHAR_A
for char in datum:
total = total + (chars.index(char) * pos)
encode = encode + CODE_MAP[chars.index(char)]
pos += 1
else:
for char in (datum[i:i + 2] for i in range(0, len(datum), 2)):
total = total + (int(char) * pos)
encode = encode + CODE_MAP[int(char)]
pos += 1
checksum = total % 103
encode = encode + CODE_MAP[checksum]
encode = encode + CODE_MAP[106]
encode = encode + CODE_MAP[107]
return encode
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