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# edb.py - functions for handling North Macedonia EDB numbers
# coding: utf-8
#
# Copyright (C) 2022 Leandro Regueiro
# Copyright (C) 2025 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
"""ЕДБ (Едниствен Даночен Број, North Macedonia tax number).
This number consists of 13 digits, sometimes with an additional "MK" prefix.
More information:
* http://www.ujp.gov.mk/en
>>> validate('4030000375897')
'4030000375897'
>>> validate('МК 4020990116747') # Cyrillic letters
'4020990116747'
>>> validate('MK4057009501106') # ASCII letters
'4057009501106'
>>> validate('4030000375890')
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> format('МК 4020990116747') # Cyrillic letters
'4020990116747'
>>> format('MK4057009501106') # ASCII letters
'4057009501106'
"""
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.
"""
number = clean(number, ' -').upper().strip()
# First two are ASCII, second two are Cyrillic
for prefix in ('MK', 'МК'):
if number.startswith(prefix):
number = number[len(prefix):]
return number
def calc_check_digit(number: str) -> str:
"""Calculate the check digit."""
weights = (7, 6, 5, 4, 3, 2, 7, 6, 5, 4, 3, 2)
total = sum(int(n) * w for n, w in zip(number, weights))
return str((-total % 11) % 10)
def validate(number: str) -> str:
"""Check if the number is a valid North Macedonia ЕДБ number.
This checks the length, formatting and check digit.
"""
number = compact(number)
if len(number) != 13:
raise InvalidLength()
if not isdigits(number):
raise InvalidFormat()
if number[-1] != calc_check_digit(number):
raise InvalidChecksum()
return number
def is_valid(number: str) -> bool:
"""Check if the number is a valid North Macedonia ЕДБ number."""
try:
return bool(validate(number))
except ValidationError:
return False
def format(number: str) -> str:
"""Reformat the number to the standard presentation format."""
return compact(number)
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