From cca66b9ec4e494c1d919bff0f71a820d8afab1fa Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:24:48 +0200
Subject: Adding upstream version 1.2.2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 share/extensions/barcode/Upce.py | 112 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 share/extensions/barcode/Upce.py

(limited to 'share/extensions/barcode/Upce.py')

diff --git a/share/extensions/barcode/Upce.py b/share/extensions/barcode/Upce.py
new file mode 100644
index 0000000..9404ca2
--- /dev/null
+++ b/share/extensions/barcode/Upce.py
@@ -0,0 +1,112 @@
+# coding=utf-8
+#
+# Copyright (C) 2010 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.
+#
+"""
+Python barcode renderer for UPCE barcodes. Designed for use with Inkscape.
+"""
+
+from .BaseEan import EanBarcode
+from inkex.localization import inkex_gettext as _
+
+# This is almost exactly the same as the standard FAMILIES
+# But flipped around and with the first 111000 instead of 000000.
+FAMS = [
+    "111000",
+    "110100",
+    "110010",
+    "110001",
+    "101100",
+    "100110",
+    "100011",
+    "101010",
+    "101001",
+    "100101",
+]
+
+
+class Upce(EanBarcode):
+    """Generate EAN6/UPC-E barcode generator"""
+
+    name = "upce"
+    font_size = 10
+    lengths = [6, 11]
+    checks = [7, 12]
+    center_bar = "020"
+
+    def _encode(self, num, guide=False):
+        """Generate a UPC-E Barcode"""
+        self.text = EanBarcode.space(["0"], 2, num[:6], 2, num[-1])
+        code = EanBarcode.encode_interleaved(num[-1], num[:6], FAMS)
+        return self.enclose(code)
+
+    def append_checksum(self, number):
+        """Generate a UPCE Checksum"""
+        if len(number) == 6:
+            number = Upce.convert_e2a(number)
+        result = self.get_checksum(number)
+        return Upce.convert_a2e(number) + result
+
+    @staticmethod
+    def convert_a2e(number):
+        """Converting UPC-A to UPC-E, may cause errors."""
+        # All UPC-E Numbers use number system 0
+        if number[0] != "0" or len(number) != 11:
+            # If not then the code is invalid
+            raise ValueError(_("Invalid UPC Number"))
+
+        # Most of the conversions deal
+        # with the specific code parts
+        maker = number[1:6]
+        product = number[6:11]
+
+        # There are 4 cases to convert:
+        if maker[2:] == "000" or maker[2:] == "100" or maker[2:] == "200":
+            # Maximum number product code digits can be encoded
+            if product[:2] == "00":
+                return maker[:2] + product[2:] + maker[2]
+        elif maker[3:5] == "00":
+            # Now only 2 product code digits can be used
+            if product[:3] == "000":
+                return maker[:3] + product[3:] + "3"
+        elif maker[4] == "0":
+            # With even more maker code we have less room for product code
+            if product[:4] == "0000":
+                return maker[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 maker + product[4]
+        # Invalid UPC-A Numbe
+        raise ValueError(_("Invalid UPC Number"))
+
+    @staticmethod
+    def convert_e2a(number):
+        """Convert UPC-E to UPC-A by padding with zeros"""
+        # 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] in ["0", "1", "2"]:
+            return "0" + number[:2] + number[5] + "0000" + number[2:5]
+        if number[5] == "3":
+            return "0" + number[:3] + "00000" + number[3:5]
+        if number[5] == "4":
+            return "0" + number[:4] + "00000" + number[4]
+        return "0" + number[:5] + "0000" + number[5]
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