80 lines
2.4 KiB
Python
80 lines
2.4 KiB
Python
# nipt.py - functions for handling Albanian VAT numbers
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# coding: utf-8
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#
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# Copyright (C) 2008-2011 Cédric Krier
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# Copyright (C) 2008-2011 B2CK
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# Copyright (C) 2015 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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"""NIPT (Numri i Identifikimit për Personin e Tatueshëm, Albanian VAT number).
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The Albanian NIPT is a 10-digit number with the first and last character
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being letters.
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>>> validate('AL J 91402501 L')
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'J91402501L'
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>>> validate('K22218003V')
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'K22218003V'
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>>> validate('(AL) J 91402501')
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Traceback (most recent call last):
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...
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InvalidLength: ...
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>>> validate('Z 22218003 V')
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Traceback (most recent call last):
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...
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InvalidFormat: ...
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"""
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import re
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from stdnum.exceptions import *
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from stdnum.util import clean
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# regular expression for matching number
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_nipt_re = re.compile(r'^[JKL][0-9]{8}[A-Z]$')
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def compact(number):
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"""Convert the number to the minimal representation. This strips the
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number of any valid separators and removes surrounding whitespace."""
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number = clean(number, ' ').upper().strip()
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if number.startswith('AL'):
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number = number[2:]
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if number.startswith('(AL)'):
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number = number[4:]
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return number
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def validate(number):
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"""Checks to see if the number provided is a valid VAT number. This
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checks the length and formatting."""
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number = compact(number)
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if len(number) != 10:
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raise InvalidLength()
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if not _nipt_re.match(number):
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raise InvalidFormat()
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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 VAT number. This
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checks the length and formatting."""
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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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