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# vat.py - functions for handling Belgian VAT numbers
#
# Copyright (C) 2012 Arthur de Jong
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
"""BTW, TVA, NWSt (Belgian VAT number).
>>> compact('BE403019261')
'0403019261'
>>> compact('(0)403019261')
'0403019261'
>>> is_valid('BE 428759497')
True
>>> is_valid('BE431150351')
False
"""
from stdnum.util import clean
def compact(number):
"""Convert the number to the minimal representation. This strips the
number of any valid separators and removes surrounding whitespace."""
number = clean(number, ' -./').upper().strip()
if number.startswith('BE'):
number = number[2:]
if number.startswith('(0)'):
number = '0' + number[3:]
if len(number) == 9:
number = '0' + number # old format had 9 digits
return number
def checksum(number):
"""Calculate the checksum."""
return (int(number[:-2]) + int(number[-2:])) % 97
def is_valid(number):
"""Checks to see if the number provided is a valid VAT number. This checks
the length, formatting and check digit."""
try:
number = compact(number)
except:
return False
return len(number) == 10 and number.isdigit() and checksum(number) == 0
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