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# tn.py - functions for handling Egypt Tax Number 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
"""Tax Registration Number (الرقم الضريبي, Egypt tax number).
This number consists of 9 digits, usually separated into three groups
using hyphens to make it easier to read, like XXX-XXX-XXX.
More information:
* https://emsp.mts.gov.eg:8181/EMDB-web/faces/authoritiesandcompanies/authority/website/SearchAuthority.xhtml?lang=en
>>> validate('100-531-385')
'100531385'
>>> validate('٣٣١-١٠٥-٢٦٨')
'331105268'
>>> validate('12345')
Traceback (most recent call last):
...
InvalidLength: ...
>>> validate('VV3456789')
Traceback (most recent call last):
...
InvalidFormat: ...
>>> format('100531385')
'100-531-385'
""" # noqa: E501
from __future__ import annotations
from stdnum.exceptions import *
from stdnum.util import clean, isdigits
_ARABIC_NUMBERS_MAP = {
# Arabic-indic digits.
'٠': '0',
'١': '1',
'٢': '2',
'٣': '3',
'٤': '4',
'٥': '5',
'٦': '6',
'٧': '7',
'٨': '8',
'٩': '9',
# Extended arabic-indic digits.
'۰': '0',
'۱': '1',
'۲': '2',
'۳': '3',
'۴': '4',
'۵': '5',
'۶': '6',
'۷': '7',
'۸': '8',
'۹': '9',
}
def compact(number: str) -> str:
"""Convert the number to the minimal representation.
This strips the number of any valid separators and removes surrounding
whitespace. It also converts arabic numbers.
"""
return ''.join((_ARABIC_NUMBERS_MAP.get(c, c) for c in clean(number, ' -/').strip()))
def validate(number: str) -> str:
"""Check if the number is a valid Egypt Tax Number number.
This checks the length and formatting.
"""
number = compact(number)
if not isdigits(number):
raise InvalidFormat()
if len(number) != 9:
raise InvalidLength()
return number
def is_valid(number: str) -> bool:
"""Check if the number is a valid Egypt Tax Number number."""
try:
return bool(validate(number))
except ValidationError:
return False
def format(number: str) -> str:
"""Reformat the number to the standard presentation format."""
number = compact(number)
return '-'.join([number[:3], number[3:-3], number[-3:]])
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