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