76 lines
2.2 KiB
Python
76 lines
2.2 KiB
Python
"""Module: barcode.codabar
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:Provided barcodes: Codabar (NW-7)
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"""
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__docformat__ = "restructuredtext en"
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from barcode.base import Barcode
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from barcode.charsets import codabar
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from barcode.errors import BarcodeError
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from barcode.errors import IllegalCharacterError
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class CODABAR(Barcode):
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"""Initializes a new CODABAR instance.
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:parameters:
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code : String
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Codabar (NW-7) string that matches [ABCD][0-9$:/.+-]+[ABCD]
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writer : barcode.writer Instance
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The writer to render the barcode (default: SVGWriter).
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narrow: Integer
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Width of the narrow elements (default: 2)
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wide: Integer
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Width of the wide elements (default: 5)
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wide/narrow must be in the range 2..3
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"""
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name = "Codabar (NW-7)"
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def __init__(self, code, writer=None, narrow=2, wide=5) -> None:
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self.code = code
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self.writer = writer or self.default_writer()
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self.narrow = narrow
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self.wide = wide
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def __str__(self) -> str:
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return self.code
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def get_fullcode(self):
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return self.code
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def build(self):
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try:
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data = (
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codabar.STARTSTOP[self.code[0]] + "n"
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) # Start with [A-D], followed by a narrow space
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except KeyError:
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raise BarcodeError("Codabar should start with either A,B,C or D") from None
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try:
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data += "n".join(
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[codabar.CODES[c] for c in self.code[1:-1]]
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) # separated by a narrow space
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except KeyError:
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raise IllegalCharacterError(
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"Codabar can only contain numerics or $:/.+-"
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) from None
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try:
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data += "n" + codabar.STARTSTOP[self.code[-1]] # End with [A-D]
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except KeyError:
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raise BarcodeError("Codabar should end with either A,B,C or D") from None
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raw = ""
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for e in data:
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if e == "W":
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raw += "1" * self.wide
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if e == "w":
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raw += "0" * self.wide
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if e == "N":
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raw += "1" * self.narrow
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if e == "n":
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raw += "0" * self.narrow
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return [raw]
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