136 lines
3.7 KiB
Python
136 lines
3.7 KiB
Python
# -*- coding: utf-8 -*-
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from __future__ import unicode_literals
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from barcode.ean import EuropeanArticleNumber13
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from barcode.errors import *
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"""Module: barcode.isxn
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:Provided barcodes: ISBN-13, ISBN-10, ISSN
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This module provides some special codes, which are no standalone barcodes.
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All codes where transformed to EAN-13 barcodes. In every case, the checksum
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is new calculated.
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Example::
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>>> from barcode import get_barcode
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>>> ISBN = get_barcode('isbn10')
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>>> isbn = ISBN('0132354187')
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>>> unicode(isbn)
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'0132354187'
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>>> isbn.get_fullcode()
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'9780132354189'
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>>> # Test with wrong checksum
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>>> isbn = ISBN('0132354180')
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>>> unicode(isbn)
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'0132354187'
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"""
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__docformat__ = 'restructuredtext en'
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class InternationalStandardBookNumber13(EuropeanArticleNumber13):
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"""Initializes new ISBN-13 barcode.
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:parameters:
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isbn : String
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The isbn 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 = 'ISBN-13'
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def __init__(self, isbn, writer=None):
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isbn = isbn.replace('-', '')
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self.isbn13 = isbn
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if isbn[:3] not in ('978', '979'):
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raise WrongCountryCodeError('ISBN must start with 978 or 979.')
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if isbn[:3] == '979':
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if isbn[3:5] not in ('10', '11'):
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raise BarcodeError('ISBN must start with 97910 or 97911.')
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EuropeanArticleNumber13.__init__(self, isbn, writer)
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class InternationalStandardBookNumber10(InternationalStandardBookNumber13):
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"""Initializes new ISBN-10 barcode. This code is rendered as EAN-13 by
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prefixing it with 978.
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:parameters:
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isbn : String
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The isbn 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 = 'ISBN-10'
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digits = 9
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def __init__(self, isbn, writer=None):
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isbn = isbn.replace('-', '')
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isbn = isbn[:self.digits]
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self.isbn10 = isbn
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self.isbn10 = '{0}{1}'.format(isbn, self._calculate_checksum())
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InternationalStandardBookNumber13.__init__(self, '978' + isbn, writer)
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def _calculate_checksum(self):
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tmp = sum([x * int(y) for x, y in enumerate(self.isbn10[:9],
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start=1)]) % 11
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if tmp == 10:
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return 'X'
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else:
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return tmp
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def __unicode__(self):
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return self.isbn10
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__str__ = __unicode__
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class InternationalStandardSerialNumber(EuropeanArticleNumber13):
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"""Initializes new ISSN barcode. This code is rendered as EAN-13
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by prefixing it with 977 and adding 00 between code and checksum.
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:parameters:
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issn : String
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The issn 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 = 'ISSN'
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digits = 7
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def __init__(self, issn, writer=None):
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issn = issn.replace('-', '')
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issn = issn[:self.digits]
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self.issn = issn
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self.issn = '{0}{1}'.format(issn, self._calculate_checksum())
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EuropeanArticleNumber13.__init__(self, self.make_ean(), writer)
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def _calculate_checksum(self):
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tmp = 11 - sum([x * int(y) for x, y in
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enumerate(reversed(self.issn[:7]), start=2)]) % 11
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if tmp == 10:
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return 'X'
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else:
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return tmp
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def make_ean(self):
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return '977{0}00{1}'.format(self.issn[:7], self._calculate_checksum())
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def __unicode__(self):
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return self.issn
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__str__ = __unicode__
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# Shortcuts
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ISBN13 = InternationalStandardBookNumber13
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ISBN10 = InternationalStandardBookNumber10
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ISSN = InternationalStandardSerialNumber
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