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# 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.
#
"""
Some basic common code shared between EAN and UCP generators.
"""
from .Base import Barcode, TEXT_POS_TOP
from inkex.localization import inkex_gettext as _
try:
from typing import Optional, List, Dict
except ImportError:
pass
MAPPING = [
# Left side of barcode Family '0'
[
"0001101",
"0011001",
"0010011",
"0111101",
"0100011",
"0110001",
"0101111",
"0111011",
"0110111",
"0001011",
],
# Left side of barcode Family '1' and flipped to right side.
[
"0100111",
"0110011",
"0011011",
"0100001",
"0011101",
"0111001",
"0000101",
"0010001",
"0001001",
"0010111",
],
]
# This chooses which of the two encodings above to use.
FAMILIES = (
"000000",
"001011",
"001101",
"001110",
"010011",
"011001",
"011100",
"010101",
"010110",
"011010",
)
class EanBarcode(Barcode):
"""Simple base class for all EAN type barcodes"""
lengths = None # type: Optional[List[int]]
length = None # type: Optional[int]
checks = [] # type: List[int]
extras = {} # type: Dict[int, str]
magic = 10
guard_bar = "202"
center_bar = "02020"
@staticmethod
def intarray(number):
"""Convert a string of digits into an array of ints"""
return [int(i) for i in number]
@staticmethod
def encode_interleaved(family, number, fams=FAMILIES):
"""Encode any side of the barcode, interleaved"""
result = []
encset = EanBarcode.intarray(fams[family])
for i, _ in enumerate(number):
thismap = MAPPING[encset[i]]
result.append(thismap[number[i]])
return result
@staticmethod
def encode_right(number):
"""Encode the right side of the barcode, non-interleaved"""
result = []
for num in number:
# The right side is always the reverse of the left's family '1'
result.append(MAPPING[1][num][::-1])
return result
@staticmethod
def encode_left(number):
"""Encode the left side of the barcode, non-interleaved"""
result = []
for num in number:
result.append(MAPPING[0][num])
return result
@staticmethod
def space(*spacing):
"""Space out an array of numbers"""
result = ""
for space in spacing:
if isinstance(space, list):
for i in space:
result += str(i)
elif isinstance(space, int):
result += " " * space
return result
def get_lengths(self):
"""Return a list of acceptable lengths"""
if self.length:
return [self.length]
return self.lengths[:]
def encode(self, text):
"""Encode any EAN barcode"""
code = text.replace(" ", "").strip()
guide = code.endswith(">")
code = code.strip(">")
if not code.isdigit():
return self.error(code, _("Not a Number, must be digits 0-9 only"))
lengths = self.get_lengths() + self.checks
# Allow extra barcodes after the first one
if len(code) not in lengths:
for extra in self.extras:
sep = len(code) - extra
if sep in lengths:
# Generate a barcode along side this one.
self.add_extra_barcode(
self.extras[extra],
text=code[sep:],
x=self.pos_x + 400 * self.scale,
text_pos=TEXT_POS_TOP,
)
code = code[:sep]
if len(code) not in lengths:
return self.error(
code,
_("Wrong size {:d}, must be {} digits").format(
len(code), ", ".join([str(length) for length in lengths])
),
)
if self.checks:
if len(code) not in self.checks:
code = self.append_checksum(code)
elif not self.verify_checksum(code):
return self.error(code, _("Checksum failed, omit for new sum"))
return self._encode(EanBarcode.intarray(code), guide=guide)
def _encode(self, num, guide=False):
"""
Write your EAN encoding function, it's passed in an array of int and
it should return a string on 1 and 0 for black and white parts
"""
raise NotImplementedError("_encode should be provided by parent EAN")
def enclose(self, left, right=()):
"""Standard Enclosure"""
parts = [self.guard_bar] + left
parts.append(self.center_bar)
parts += list(right) + [self.guard_bar]
return "".join(parts)
def get_checksum(self, num):
"""Generate a UPCA/EAN13/EAN8 Checksum"""
# Left to right,checksum based on first digits.
total = sum([int(n) * (3, 1)[x % 2] for x, n in enumerate(num[::-1])])
# Modulous result to a single digit checksum
checksum = self.magic - (total % self.magic)
if checksum < 0 or checksum >= self.magic:
return "0"
return str(checksum)
def append_checksum(self, number):
"""Apply the checksum to a short number"""
return number + self.get_checksum(number)
def verify_checksum(self, number):
"""Verify any checksum"""
return self.get_checksum(number[:-1]) == number[-1]
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