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"""Module: barcode.ean
:Provided barcodes: EAN-14, EAN-13, EAN-8, JAN
"""
__docformat__ = "restructuredtext en"
from functools import reduce
from barcode.base import Barcode
from barcode.charsets import ean as _ean
from barcode.errors import IllegalCharacterError
from barcode.errors import NumberOfDigitsError
from barcode.errors import WrongCountryCodeError
# EAN13 Specs (all sizes in mm)
SIZES = {
"SC0": 0.27,
"SC1": 0.297,
"SC2": 0.33,
"SC3": 0.363,
"SC4": 0.396,
"SC5": 0.445,
"SC6": 0.495,
"SC7": 0.544,
"SC8": 0.61,
"SC9": 0.66,
}
class EuropeanArticleNumber13(Barcode):
"""Initializes EAN13 object.
:parameters:
ean : String
The ean number as string.
writer : barcode.writer Instance
The writer to render the barcode (default: SVGWriter).
"""
name = "EAN-13"
digits = 12
def __init__(self, ean, writer=None, no_checksum=False, guardbar=False) -> None:
ean = ean[: self.digits]
if not ean.isdigit():
raise IllegalCharacterError("EAN code can only contain numbers.")
if len(ean) != self.digits:
raise NumberOfDigitsError(
"EAN must have {} digits, not {}.".format(
self.digits,
len(ean),
)
)
self.ean = ean
# If no checksum
if no_checksum:
# Add a thirteen char if given in parameter,
# otherwise pad with zero
self.ean = "{}{}".format(
ean, ean[self.digits] if len(ean) > self.digits else 0
)
else:
self.ean = f"{ean}{self.calculate_checksum()}"
self.guardbar = guardbar
if guardbar:
self.EDGE = _ean.EDGE.replace("1", "G")
self.MIDDLE = _ean.MIDDLE.replace("1", "G")
else:
self.EDGE = _ean.EDGE
self.MIDDLE = _ean.MIDDLE
self.writer = writer or self.default_writer()
def __str__(self) -> str:
return self.ean
def get_fullcode(self):
if self.guardbar:
return self.ean[0] + " " + self.ean[1:7] + " " + self.ean[7:] + " >"
return self.ean
def calculate_checksum(self):
"""Calculates the checksum for EAN13-Code.
:returns: The checksum for `self.ean`.
:rtype: Integer
"""
def sum_(x, y):
return int(x) + int(y)
evensum = reduce(sum_, self.ean[-2::-2])
oddsum = reduce(sum_, self.ean[-1::-2])
return (10 - ((evensum + oddsum * 3) % 10)) % 10
def build(self):
"""Builds the barcode pattern from `self.ean`.
:returns: The pattern as string
:rtype: String
"""
code = self.EDGE[:]
pattern = _ean.LEFT_PATTERN[int(self.ean[0])]
for i, number in enumerate(self.ean[1:7]):
code += _ean.CODES[pattern[i]][int(number)]
code += self.MIDDLE
for number in self.ean[7:]:
code += _ean.CODES["C"][int(number)]
code += self.EDGE
return [code]
def to_ascii(self):
"""Returns an ascii representation of the barcode.
:rtype: String
"""
code = self.build()
for i, line in enumerate(code):
code[i] = line.replace("G", "|").replace("1", "|").replace("0", " ")
return "\n".join(code)
def render(self, writer_options=None, text=None):
options = {"module_width": SIZES["SC2"]}
options.update(writer_options or {})
return super().render(options, text)
class EuropeanArticleNumber13WithGuard(EuropeanArticleNumber13):
name = "EAN-13 with guards"
def __init__(self, ean, writer=None, no_checksum=False, guardbar=True) -> None:
super().__init__(ean, writer, no_checksum, guardbar)
class JapanArticleNumber(EuropeanArticleNumber13):
"""Initializes JAN barcode.
:parameters:
jan : String
The jan number as string.
writer : barcode.writer Instance
The writer to render the barcode (default: SVGWriter).
"""
name = "JAN"
valid_country_codes = list(range(450, 460)) + list(range(490, 500))
def __init__(self, jan, *args, **kwargs) -> None:
if int(jan[:3]) not in self.valid_country_codes:
raise WrongCountryCodeError(
"Country code isn't between 450-460 or 490-500."
)
super().__init__(jan, *args, **kwargs)
class EuropeanArticleNumber8(EuropeanArticleNumber13):
"""Represents an EAN-8 barcode. See EAN13's __init__ for details.
:parameters:
ean : String
The ean number as string.
writer : barcode.writer Instance
The writer to render the barcode (default: SVGWriter).
"""
name = "EAN-8"
digits = 7
def build(self):
"""Builds the barcode pattern from `self.ean`.
:returns: The pattern as string
:rtype: String
"""
code = self.EDGE[:]
for number in self.ean[:4]:
code += _ean.CODES["A"][int(number)]
code += self.MIDDLE
for number in self.ean[4:]:
code += _ean.CODES["C"][int(number)]
code += self.EDGE
return [code]
def get_fullcode(self):
if self.guardbar:
return "< " + self.ean[:4] + " " + self.ean[4:] + " >"
return self.ean
class EuropeanArticleNumber8WithGuard(EuropeanArticleNumber8):
name = "EAN-8 with guards"
def __init__(self, ean, writer=None, no_checksum=False, guardbar=True) -> None:
super().__init__(ean, writer, no_checksum, guardbar)
class EuropeanArticleNumber14(EuropeanArticleNumber13):
"""Represents an EAN-14 barcode. See EAN13's __init__ for details.
:parameters:
ean : String
The ean number as string.
writer : barcode.writer Instance
The writer to render the barcode (default: SVGWriter).
"""
name = "EAN-14"
digits = 13
def calculate_checksum(self):
"""Calculates the checksum for EAN13-Code.
:returns: The checksum for `self.ean`.
:rtype: Integer
"""
def sum_(x, y):
return int(x) + int(y)
evensum = reduce(sum_, self.ean[::2])
oddsum = reduce(sum_, self.ean[1::2])
return (10 - (((evensum * 3) + oddsum) % 10)) % 10
# Shortcuts
EAN14 = EuropeanArticleNumber14
EAN13 = EuropeanArticleNumber13
EAN13_GUARD = EuropeanArticleNumber13WithGuard
EAN8 = EuropeanArticleNumber8
EAN8_GUARD = EuropeanArticleNumber8WithGuard
JAN = JapanArticleNumber
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