95 lines
2.8 KiB
Python
95 lines
2.8 KiB
Python
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# isil.py - functions for handling identifiers for libraries and related
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# organizations
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#
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# Copyright (C) 2011, 2012, 2013 Arthur de Jong
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301 USA
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"""ISIL (International Standard Identifier for Libraries).
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The ISIL is the International Standard Identifier for
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Libraries and Related Organizations.
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>>> validate('IT-RM0267')
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'IT-RM0267'
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>>> validate('OCLC-DLC')
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'OCLC-DLC'
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>>> validate('WW-RM0267') # unregistered country code
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Traceback (most recent call last):
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...
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InvalidComponent: ...
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>>> validate('WW-RM026712423345334534512334534545') # too long
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Traceback (most recent call last):
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...
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InvalidLength: ...
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>>> format('it-RM0267')
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'IT-RM0267'
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"""
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from stdnum.exceptions import *
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from stdnum.util import clean
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# the valid characters in an ISIL
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_alphabet = set('0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-:/')
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def compact(number):
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"""Convert the ISIL to the minimal representation. This strips
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surrounding whitespace."""
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return clean(number, '').strip()
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def _known_agency(agency):
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"""Checks whether the specified agency is valid."""
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# look it up in the db
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from stdnum import numdb
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results = numdb.get('isil').info(agency.upper() + '$')
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# there should be only one part and it should have properties
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return len(results) == 1 and bool(results[0][1])
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def validate(number):
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"""Checks to see if the number provided is a valid isil (or isilSV)
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number."""
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number = compact(number)
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for n in number:
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if n not in _alphabet:
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raise InvalidFormat()
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if len(number) > 15:
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raise InvalidLength()
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if not _known_agency(number.split('-')[0]):
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raise InvalidComponent()
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return number
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def is_valid(number):
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"""Checks to see if the number provided is a valid isil (or isilSV)
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number."""
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try:
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return bool(validate(number))
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except ValidationError:
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return False
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def format(number):
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"""Reformat the passed number to the standard format."""
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number = compact(number)
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parts = number.split('-')
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if len(parts) > 1 and _known_agency(parts[0]):
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parts[0] = parts[0].upper()
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return '-'.join(parts)
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