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# cf.py - functions for handling Romanian CF (VAT) numbers
# coding: utf-8
#
# Copyright (C) 2012-2015 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
"""CF (Cod de înregistrare în scopuri de TVA, Romanian VAT number).
The Romanian CF is used for VAT purposes and can be from 2 to 10 digits long.
>>> validate('RO 185 472 90')
'18547290'
>>> validate('185 472 91')
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> validate('1630615123457') # personal code
'1630615123457'
"""
from stdnum.exceptions import *
from stdnum.ro import cnp
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('RO'):
number = number[2:]
return number
def calc_check_digit(number):
"""Calculate the check digit for organisations. The number passed
should not have the check digit included."""
weights = (7, 5, 3, 2, 1, 7, 5, 3, 2)
number = (9 - len(number)) * '0' + number
check = 10 * sum(w * int(n) for w, n in zip(weights, number))
return str(check % 11 % 10)
def validate(number):
"""Check if the number is a valid VAT number. This checks the length,
formatting and check digit."""
number = compact(number)
if not number.isdigit() or number[0] == '0':
raise InvalidFormat()
if len(number) == 13:
# apparently a CNP can also be used (however, not all sources agree)
cnp.validate(number)
elif 2 <= len(number) <= 10:
if calc_check_digit(number[:-1]) != number[-1]:
raise InvalidChecksum()
else:
raise InvalidLength()
return number
def is_valid(number):
"""Check if the number is a valid VAT number."""
try:
return bool(validate(number))
except ValidationError:
return False
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