python-barcode/barcode/codabar.py at main · patchwright/python-barcode · GitHub

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"""Module: barcode.codabar

:Provided barcodes: Codabar (NW-7)

"""

from __future__ import annotations

__docformat__ = "restructuredtext en"

from barcode.base import Barcode

from barcode.charsets import codabar

from barcode.errors import BarcodeError

from barcode.errors import IllegalCharacterError

class CODABAR(Barcode):

"""Initializes a new CODABAR instance.

:parameters:

code : String

Codabar (NW-7) string that matches [ABCD][0-9$:/.+-]+[ABCD]

writer : barcode.writer Instance

The writer to render the barcode (default: SVGWriter).

narrow: Integer

Width of the narrow elements (default: 2)

wide: Integer

Width of the wide elements (default: 5)

wide/narrow must be in the range 2..3

"""

name = "Codabar (NW-7)"

def __init__(self, code, writer=None, narrow=2, wide=5) -> None:

self.code = code

self.writer = writer or self.default_writer()

self.narrow = narrow

self.wide = wide

def __str__(self) -> str:

return self.code

def get_fullcode(self):

return self.code

def build(self) -> list[str]:

try:

data = (

codabar.STARTSTOP[self.code[0]] + "n"

) # Start with [A-D], followed by a narrow space

except KeyError:

raise BarcodeError("Codabar should start with either A,B,C or D") from None

try:

data += "n".join(

[codabar.CODES[c] for c in self.code[1:-1]]

) # separated by a narrow space

except KeyError:

raise IllegalCharacterError(

"Codabar can only contain numerics or $:/.+-"

) from None

try:

data += "n" + codabar.STARTSTOP[self.code[-1]] # End with [A-D]

except KeyError:

raise BarcodeError("Codabar should end with either A,B,C or D") from None

raw = ""

for e in data:

if e == "W":

raw += "1" * self.wide

if e == "w":

raw += "0" * self.wide

if e == "N":

raw += "1" * self.narrow

if e == "n":

raw += "0" * self.narrow

return [raw]

python-barcode/barcode/codabar.py at main · patchwright/python-barcode · GitHub

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