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# accise.py - functions for handling French Accise numbers
# coding: utf-8
#
# Copyright (C) 2023 Cédric Krier
#
# 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
"""n° d'accise (French number to identify taxpayers of excise taxes).
The n° d'accise always start by FR0 following by the 2 ending digits of the
year, 3 number of customs office, one letter for the type and an ordering
number of 4 digits.
>>> validate('FR023004N9448')
'FR023004N9448'
>>> validate('FR0XX907E0820')
Traceback (most recent call last):
...
InvalidFormat: ...
>>> validate('FR012907A0820')
Traceback (most recent call last):
...
InvalidComponent: ...
"""
from __future__ import annotations
from stdnum.exceptions import *
from stdnum.util import clean, isdigits
OPERATORS = set(['E', 'N', 'C', 'B'])
def compact(number: str) -> str:
"""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: str) -> str:
"""Check if the number is a valid accise number. This checks the length,
formatting."""
number = compact(number)
code = number[:3]
if code != 'FR0':
raise InvalidFormat()
if len(number) != 13:
raise InvalidLength()
if not isdigits(number[3:5]):
raise InvalidFormat()
if not isdigits(number[5:8]):
raise InvalidFormat()
if number[8] not in OPERATORS:
raise InvalidComponent()
if not isdigits(number[9:12]):
raise InvalidFormat()
return number
def is_valid(number: str) -> bool:
"""Check if the number is a valid accise number."""
try:
return bool(validate(number))
except ValidationError:
return False
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