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# regon.py - functions for handling REGON numbers
# coding: utf-8
#
# Copyright (C) 2015 Dariusz Choruzy
# Copyright (C) 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
"""REGON (Rejestr Gospodarki Narodowej, Polish register of economic units).
The REGON (Rejestr Gospodarki Narodowej) is a statistical identification
number for businesses. National entities are assigned a 9-digit number, while
local units append 5 digits to form a 14-digit number.
More information:
* https://bip.stat.gov.pl/en/regon/
* https://wyszukiwarkaregon.stat.gov.pl/appBIR/index.aspx
>>> validate('192598184')
'192598184'
>>> validate('123456785')
'123456785'
>>> validate('192598183')
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> validate('12345678512347')
'12345678512347'
>>> validate('12345678612342') # first check digit invalid
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> validate('12345678512348') # last check digit invalid
Traceback (most recent call last):
...
InvalidChecksum: ...
"""
from __future__ import annotations
from stdnum.exceptions import *
from stdnum.util import clean, isdigits
def compact(number: str) -> str:
"""Convert the number to the minimal representation. This strips the
number of any valid separators and removes surrounding whitespace."""
return clean(number, ' -').upper().strip()
def calc_check_digit(number: str) -> str:
"""Calculate the check digit for organisations. The number passed
should not have the check digit included."""
if len(number) == 8:
weights = [8, 9, 2, 3, 4, 5, 6, 7]
else:
weights = [2, 4, 8, 5, 0, 9, 7, 3, 6, 1, 2, 4, 8]
check = sum(w * int(n) for w, n in zip(weights, number))
return str(check % 11 % 10)
def validate(number: str) -> str:
"""Check if the number is a valid REGON number. This checks the length,
formatting and check digit."""
number = compact(number)
if not isdigits(number):
raise InvalidFormat()
if len(number) not in (9, 14):
raise InvalidLength()
if number[-1] != calc_check_digit(number[:-1]):
raise InvalidChecksum()
if len(number) == 14 and number[8] != calc_check_digit(number[:8]):
raise InvalidChecksum()
return number
def is_valid(number: str) -> bool:
"""Check if the number is a valid REGON number."""
try:
return bool(validate(number))
except ValidationError:
return False
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