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# rntrc.py - functions for handling Ukrainian RNTRC numbers
# coding: utf-8
#
# Copyright (C) 2020 Leandro Regueiro
#
# 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
"""РНОКПП, RNTRC (Individual taxpayer registration number in Ukraine).
The РНОКПП (Реєстраційний номер облікової картки платника податків,
registration number of the taxpayer's registration card) is a unique
identification number that is provided to individuals within Ukraine. The
number consists of 10 digits, the last being a check digit.
More information:
* https://uk.wikipedia.org/wiki/РНОКПП
>>> validate('1759013776')
'1759013776'
>>> validate('1759013770')
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> validate('12345')
Traceback (most recent call last):
...
InvalidLength: ...
>>> format(' 25 30 41 40 71 ')
'2530414071'
"""
from stdnum.exceptions import *
from stdnum.util import clean, isdigits
def compact(number):
"""Convert the number to the minimal representation."""
return clean(number, ' ').strip()
def calc_check_digit(number):
"""Calculate the check digit for number."""
weights = (-1, 5, 7, 9, 4, 6, 10, 5, 7)
total = sum(w * int(n) for w, n in zip(weights, number))
return str((total % 11) % 10)
def validate(number):
"""Check if the number is a valid Ukraine RNTRC (РНОКПП) number.
This checks the length, formatting and check digit.
"""
number = compact(number)
if len(number) != 10:
raise InvalidLength()
if not isdigits(number):
raise InvalidFormat()
if number[-1] != calc_check_digit(number):
raise InvalidChecksum()
return number
def is_valid(number):
"""Check if the number is a valid Ukraine RNTRC (РНОКПП) number."""
try:
return bool(validate(number))
except ValidationError:
return False
def format(number):
"""Reformat the number to the standard presentation format."""
return compact(number)
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