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"""Module: barcode.codabar
:Provided barcodes: Codabar (NW-7)
"""
__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):
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]
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