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Add support for Senegal TIN
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Fixes #357
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@unho
unho committed Feb 12, 2023
1 parent 6d366e3 commit bb62605
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24 changes: 24 additions & 0 deletions stdnum/sn/__init__.py
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# __init__.py - collection of Senegal numbers
# coding: utf-8
#
# Copyright (C) 2023 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

"""Collection of Senegal numbers."""

# provide aliases
from stdnum.sn import ninea as vat # noqa: F401
165 changes: 165 additions & 0 deletions stdnum/sn/ninea.py
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# ninea.py - functions for handling Senegal NINEA numbers
# coding: utf-8
#
# Copyright (C) 2023 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

"""NINEA (Numéro d'Identification national des Entreprises et Associations,
Senegal tax number).
This number consists of 7 digits (in practive it is sometimes 9 digits, the
first two being zeroes). It is usually followed by a Tax Identification Code
called COFI.
The COFI consists of 3 alphanumeric characters. The first one is a digit:
* 0: taxpayer subject to the real scheme, not subject to VAT.
* 1: taxpayer subject to the single global contribution (TOU).
* 2: taxpayer subject to the real scheme and subject to VAT.
The second character is a letter that indicates the tax center of attachment:
* A: Dakar Plateau 1.
* B: Dakar Plateau 2.
* C: Grand Dakar.
* D: Pikine.
* E: Rufisque.
* F: Thiès.
* G: Big Business Center.
* H: Luga.
* J: Diourbel.
* K: Saint-Louis.
* L: Tambacounda.
* M: Kaolack.
* N: Fatick.
* P: A.
* Q: Kolda.
* R: remediated Parcels.
* S: Liberal Professions.
* T: Guédiawaye.
* U: Dakar-Medina.
* V: Dakar Freedom.
* W: Matam.
* Z: Medium Business Centre.
The third character is a digit that indicates the legal form of the taxpayer:
* 1: Individual-Natural person.
* 2: SARL.
* 3: SA.
* 4: Simple Limited Partnership.
* 5: Share Sponsorship Company.
* 6: GIE.
* 7: Civil Society.
* 8: Partnership.
* 9: Cooperative Association.
* 0: Other.
More information:
* https://www.nkac-audit.com/en/comment-lire-un-numero-d-identifiant-fiscal-unique-ninea-au-senegal/
* https://audifiscsn.com/en/2021/12/11/savoir-bien-lire-le-ninea-peut-vous-eviter-des-redressements-fiscaux/
* https://www.creationdentreprise.sn/rechercher-une-societe
>>> validate('3067221')
'3067221'
>>> validate('30672212G2')
'30672212G2'
>>> validate('306 7221')
'3067221'
>>> validate('3067221 2G2')
'30672212G2'
>>> validate('12345')
Traceback (most recent call last):
...
InvalidLength: ...
>>> validate('VV34567')
Traceback (most recent call last):
...
InvalidFormat: ...
>>> validate('VV345670A0')
Traceback (most recent call last):
...
InvalidFormat: ...
>>> validate('12345679A0')
Traceback (most recent call last):
...
InvalidComponent: ...
>>> validate('12345670I0')
Traceback (most recent call last):
...
InvalidComponent: ...
>>> validate('12345670AZ')
Traceback (most recent call last):
...
InvalidComponent: ...
>>> format('30672212G2')
'3067221 2G2'
""" # noqa: E501

from stdnum.exceptions import *
from stdnum.util import clean, isdigits


TAX_CENTERS = ('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N',
'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'Z')


def compact(number):
"""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 validate(number):
"""Check if the number is a valid Senegal NINEA number.
This checks the length and formatting.
"""
number = compact(number)
if len(number) not in (7, 9, 10, 12):
raise InvalidLength()
if len(number) in (7, 9) and not isdigits(number):
raise InvalidFormat()
if len(number) in (10, 12) and not isdigits(number[:-3]):
raise InvalidFormat()
if len(number) in (10, 12) and number[-3] not in ('0', '1', '2'):
raise InvalidComponent()
if len(number) in (10, 12) and number[-2] not in TAX_CENTERS:
raise InvalidComponent()
if len(number) in (10, 12) and not isdigits(number[-1]):
raise InvalidComponent()
return number


def is_valid(number):
"""Check if the number is a valid Senegal NINEA number."""
try:
return bool(validate(number))
except ValidationError:
return False


def format(number):
"""Reformat the number to the standard presentation format."""
number = compact(number)
if len(number) in (7, 9):
return number
return ' '.join([number[:-3], number[-3:]])
182 changes: 182 additions & 0 deletions tests/test_sn_ninea.doctest
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test_sn_ninea.doctest - more detailed doctests for stdnum.sn.ninea module

Copyright (C) 2023 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


This file contains more detailed doctests for the stdnum.sn.ninea module. It
tries to test more corner cases and detailed functionality that is not really
useful as module documentation.

>>> from stdnum.sn import ninea


Tests for some corner cases.

>>> ninea.validate('3067221')
'3067221'
>>> ninea.validate('30672212G2')
'30672212G2'
>>> ninea.validate('306 7221')
'3067221'
>>> ninea.validate('3067221 2G2')
'30672212G2'
>>> ninea.validate('3067221/2/G/2')
'30672212G2'
>>> ninea.validate('3067221-2G2')
'30672212G2'
>>> ninea.validate('12345')
Traceback (most recent call last):
...
InvalidLength: ...
>>> ninea.validate('VV34567')
Traceback (most recent call last):
...
InvalidFormat: ...
>>> ninea.validate('VV345670A0')
Traceback (most recent call last):
...
InvalidFormat: ...
>>> ninea.validate('12345679A0')
Traceback (most recent call last):
...
InvalidComponent: ...
>>> ninea.validate('12345670I0')
Traceback (most recent call last):
...
InvalidComponent: ...
>>> ninea.validate('12345670AV')
Traceback (most recent call last):
...
InvalidComponent: ...
>>> ninea.format('30672212G2')
'3067221 2G2'


These have been found online and should all be valid numbers.

>>> numbers = '''
...
... 30672212G2
... 008895677
... 0288846 2G3
... 006269436
... 0120 212
... 005131305 2G3
... 005844700
... 2,838,516 2B3
... 0,513,475 2C1
... 005,830,866 1V1
... 0,059 990 2G3
... 006,364,472 2L2
... 0,017,766 2G3
... 5,729,803 2V2
... 0,027,476 2G3
... 005754339 2V2
... 50 63 699 2E1
... 0014051-2G3
... 48522250G0
... 0020884 2 G 3
... 006295879
... 1928863 2B2
... 00830 48 0 C 9
... 4069367 2G3
... 005241550 2C2
... 006416681
... 26080342R2
... 0283 408-2C2
... 49615470C0
... 22486742 S 3
... 20839132 S 3
... 004641363
... 0063150572G2
... 61523762A2
... 2079376/2/G/3
... 008135114
... 006208434
... 005046174
... 0044440722V1
... 00153142G3
... 005117355
... 30092572G3
... 2139378 2V2
... 0045799442C2
... 006373295/0A9
... 002420983 2G3
... 244982000
... 006946034
... 0316390
... 008517560
... 005023081
... 00569042P2
... 26581702G2
... 25833512R2
... 2599770 2 B 2
... 255 44 772 S 3
... 004343430
... 0366 709 2S2
... 007039292
... 00722992 G 3
... 007307748 1V1
... 0051126442L1
... 00154212G3
... 0185844 2 R 2
... 0332891
... 26132492D6
... 007057947
... 006325741
... 21948852B9
... 007660740
... 0404913 2B1
... 21409612D1
... 00661012S3
... 0149642
... 00605 33 92
... 006900387
... 006715314 2G3
... 2160472-2G3
... 25437852G3
... 00140012G3
... 81329702S1
... 5435 468 0G0
... 0046 00096 2S9
... 002502343
... 270 773 72 S2
... 00722992G3
... 0108531 2G3
... 2929406 0G0
... 19370542G2
... 007266126
... 008895586
... 41130152C2
... 007389100
... 005216371 2V3
... 008086242 1E1
... 00284430 C0
... 006777463
... 007912662
... 0053655402R2
... 24312110V9
... 007992482 2A3
... 0019366
... 004237633 2B2
... 005371026
... 004912269
...
... '''
>>> [x for x in numbers.splitlines() if x and not ninea.is_valid(x)]
[]

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