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# pin.py - functions for handling Tunisia MF numbers
# coding: utf-8
#
# Copyright (C) 2022 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
"""MF (Matricule Fiscal, Tunisia tax number).
The MF consists of 4 parts: the "identifiant fiscal", the "code TVA", the "code
catégorie" and the "numéro d'etablissement secondaire".
The "identifiant fiscal" consists of 2 parts: the "identifiant unique" and the
"clef de contrôle". The "identifiant unique" is composed of 7 digits. The "clef
de contrôle" is a letter, excluding "I", "O" and "U" because of their
similarity to "1", "0" and "4".
The "code TVA" is a letter that tells which VAT regime is being used. The valid
values are "A", "P", "B", "D" and "N".
The "code catégorie" is a letter that tells the category the contributor
belongs to. The valid values are "M", "P", "C", "N" and "E".
The "numéro d'etablissement secondaire" consists of 3 digits. It is usually
"000", but it can be "001", "002"... depending on the branches. If it is not
"000" then "code catégorie" must be "E".
More information:
* https://futurexpert.tn/2019/10/22/structure-et-utilite-du-matricule-fiscal/
* https://www.registre-entreprises.tn/
>>> validate('1234567/M/A/E/001')
'1234567MAE001'
>>> validate('1282182 W')
'1282182W'
>>> validate('121J')
'0000121J'
>>> validate('1219773U')
Traceback (most recent call last):
...
InvalidFormat: ...
>>> validate('1234567/M/A/X/000')
Traceback (most recent call last):
...
InvalidFormat: ...
>>> format('121J')
'0000121/J'
>>> format('1496298 T P N 000')
'1496298/T/P/N/000'
"""
import re
from stdnum.exceptions import *
from stdnum.util import clean, isdigits
_VALID_CONTROL_KEYS = ('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L',
'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'V', 'W', 'X', 'Y',
'Z')
_VALID_TVA_CODES = ('A', 'P', 'B', 'D', 'N')
_VALID_CATEGORY_CODES = ('M', 'P', 'C', 'N', 'E')
def compact(number):
"""Convert the number to the minimal representation.
This strips the number of any valid separators, removes surrounding
whitespace.
"""
number = clean(number, ' /.-').upper()
# Zero pad the numeric serial to length 7
match = re.match(r'^(?P<serial>[0-9]+)(?P<rest>.*)$', number)
if match:
number = match.group('serial').zfill(7) + match.group('rest')
return number
def validate(number):
"""Check if the number is a valid Tunisia MF number.
This checks the length and formatting.
"""
number = compact(number)
if len(number) not in (8, 13):
raise InvalidLength()
if not isdigits(number[:7]):
raise InvalidFormat()
if number[7] not in _VALID_CONTROL_KEYS:
raise InvalidFormat()
if len(number) == 8:
return number
if number[8] not in _VALID_TVA_CODES:
raise InvalidFormat()
if number[9] not in _VALID_CATEGORY_CODES:
raise InvalidFormat()
if not isdigits(number[10:]):
raise InvalidFormat()
if number[10:] != '000' and number[9] != 'E':
raise InvalidFormat()
return number
def is_valid(number):
"""Check if the number is a valid Tunisia MF number."""
try:
return bool(validate(number))
except ValidationError:
return False
def format(number):
"""Reformat the number to the standard presentation format."""
result = compact(number)
if len(result) == 8:
return '/'.join([result[:7], result[7]])
return '/'.join([result[:7], result[7], result[8], result[9], result[10:]])
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