99 lines
2.9 KiB
Python
99 lines
2.9 KiB
Python
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# edb.py - functions for handling North Macedonia EDB numbers
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# coding: utf-8
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#
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# Copyright (C) 2022 Leandro Regueiro
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# Copyright (C) 2025 Arthur de Jong
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301 USA
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"""ЕДБ (Едниствен Даночен Број, North Macedonia tax number).
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This number consists of 13 digits, sometimes with an additional "MK" prefix.
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More information:
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* http://www.ujp.gov.mk/en
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>>> validate('4030000375897')
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'4030000375897'
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>>> validate('МК 4020990116747') # Cyrillic letters
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'4020990116747'
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>>> validate('MK4057009501106') # ASCII letters
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'4057009501106'
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>>> validate('4030000375890')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> format('МК 4020990116747') # Cyrillic letters
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'4020990116747'
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>>> format('MK4057009501106') # ASCII letters
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'4057009501106'
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"""
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from __future__ import annotations
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from stdnum.exceptions import *
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from stdnum.util import clean, isdigits
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def compact(number: str) -> str:
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"""Convert the number to the minimal representation.
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This strips the number of any valid separators and removes surrounding
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whitespace.
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"""
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number = clean(number, ' -').upper().strip()
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# First two are ASCII, second two are Cyrillic
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for prefix in ('MK', 'МК'):
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if number.startswith(prefix):
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number = number[len(prefix):]
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return number
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def calc_check_digit(number: str) -> str:
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"""Calculate the check digit."""
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weights = (7, 6, 5, 4, 3, 2, 7, 6, 5, 4, 3, 2)
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total = sum(int(n) * w for n, w in zip(number, weights))
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return str((-total % 11) % 10)
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def validate(number: str) -> str:
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"""Check if the number is a valid North Macedonia ЕДБ number.
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This checks the length, formatting and check digit.
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"""
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number = compact(number)
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if len(number) != 13:
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raise InvalidLength()
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if not isdigits(number):
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raise InvalidFormat()
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if number[-1] != calc_check_digit(number):
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raise InvalidChecksum()
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return number
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def is_valid(number: str) -> bool:
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"""Check if the number is a valid North Macedonia ЕДБ number."""
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try:
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return bool(validate(number))
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except ValidationError:
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return False
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def format(number: str) -> str:
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"""Reformat the number to the standard presentation format."""
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return compact(number)
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