Add doctormo's barcode extension. Patch 1681456. Still need to make it work with the make-chinery for installation and distribution.

(bzr r2958)

1 files changed, 129 insertions, 0 deletions

diff --git a/share/extensions/Barcode/UPCE.py b/share/extensions/Barcode/UPCE.py
new file mode 100644
index 000000000..0ad518680
--- /dev/null
+++ b/share/extensions/Barcode/UPCE.py
@@ -0,0 +1,129 @@
+'''
+Copyright (C) 2007 Martin Owens
+
+Thanks to Lineaire Chez of Inkbar ( www.inkbar.lineaire.net )
+
+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 EAN13
+from EAN13 import mapLeftFaimly, guardBar, centerBar
+import sys
+
+mapFamily  = [ '000111','001011','001101','001110','010011','011001','011100','010101','010110','011010' ]
+
+class Object(EAN13.Object):
+	def encode(self, number):
+		result = ''
+
+		l = len(number)
+
+		if (l != 6 and l != 7  and l != 11 and l != 12) or not number.isdigit():
+			sys.stderr.write("Can not encode '" + number + "' into UPC-E Barcode, Size must be 6 numbers only, and 1 check digit (optional)\nOr a convertable 11 digit UPC-A number with 1 check digit (also optional).\n")
+			return
+
+		echeck = None
+		if l==7 or l==12:
+			echeck = number[-1]
+			number = number[:-1]
+			sys.stderr.write("CHECKSUM FOUND!")
+			l -= 1
+
+		if l==6:
+			number = self.ConvertEtoA(number)
+
+		if not echeck:
+			echeck = self.getChecksum(number)
+		else:
+			if not self.varifyChecksum(number + echeck):
+				sys.stderr.write("UPC-E Checksum not correct for this barcode, omit last charicter to generate new checksum.\n")
+				return
+
+		number = self.ConvertAtoE(number)
+		if not number:
+			sys.stderr.write("UPC-A code could not be converted into a UPC-E barcode, please follow the UPC guide or enter a 6 digit UPC-E number..\n")
+			return
+
+		number = number
+
+		result = result + guardBar
+		# The check digit isn't stored as bars but as a mirroring system. :-(
+		family = mapFamily[int(echeck)]
+
+		i = 0
+		for i in range(0,6):
+			result += mapLeftFaimly[int(family[i])-1][int(number[i])]
+
+		result = result + centerBar + '2';
+
+		self.label    = '0  ' + number[:6] + '  ' + echeck
+		self.inclabel = self.label
+		return result;
+
+	def fontSize(self):
+		return '10'
+
+	def ConvertAtoE(self, number):
+		# Converting UPC-A to UPC-E
+
+		# All UPC-E Numbers use number system 0
+		if number[0] != '0' or len(number)!=11:
+			# If not then the code is invalid
+			return None
+
+		# Most of the conversions deal
+		# with the specific code parts
+		manufacturer = number[1:6]
+		product = number[6:11]
+
+		# There are 4 cases to convert:
+		if manufacturer[2:] == '000' or manufacturer[2:] == '100' or manufacturer[2:] == '200':
+			# Maxium number product code digits can be encoded
+			if product[:2]=='00':
+				return manufacturer[:2] + product[2:] + manufacturer[2]
+		elif manufacturer[3:5] == '00':
+			# Now only 2 product code digits can be used
+			if product[:3]=='000':
+				return manufacturer[:3] + product[3:] + '3'
+		elif manufacturer[4] == '0':
+			# With even more manufacturer code we have less room for product code
+			if product[:4]=='0000':
+				return manufacturer[0:4] + product[4] + '4'
+		elif product[:4]=='0000' and int(product[4]) > 4:
+			# The last recorse is to try and squeeze it in the last 5 numbers
+			# so long as the product is 00005-00009 so as not to conflict with
+			# the 0-4 used above.
+			return manufacturer + product[4]
+		else:
+			# Invalid UPC-A Numbe
+			return None
+
+	def ConvertEtoA(self, number):
+		# Convert UPC-E to UPC-A
+
+		# It's more likly to convert this without fault
+		# But we still must be mindful of the 4 conversions
+		if len(number)!=6:
+			return None
+
+		if number[5]=='0' or number[5]=='1' or number[5]=='2':
+			return '0' + number[:2] + number[5] + '0000' + number[2:5]
+		elif number[5]=='3':
+			return '0' + number[:3] + '00000' + number[3:5]
+		elif number[5]=='4':
+			return '0' + number[:4] + '00000' + number[4]
+		else:
+			return '0' + number[:5] + '0000' + number[5]
+