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# ytunnus.py - functions for handling Finnish business identifiers (y-tunnus)
# coding: utf-8
#
# Copyright (C) 2015 Holvi Payment Services Oy
# Copyright (C) 2015 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
"""Y-tunnus (Finnish business identifier).
The number is an 8-digit code with a weighted checksum.
>>> validate('2077474-0')
'20774740'
>>> validate('2077474-1') # invalid check digit
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> format('2077474-0')
'2077474-0'
"""
from stdnum.exceptions import *
from stdnum.fi import alv
def compact(number):
"""Convert the number to the minimal representation. This strips the
number of any valid separators and removes surrounding whitespace."""
return alv.compact(number)
def validate(number):
"""Checks to see if the number provided is a valid business identifier.
This checks the length, formatting and check digit."""
return alv.validate(number)
def is_valid(number):
"""Checks to see if the number provided is a valid business identifier.
This checks the length, formatting and check digit."""
try:
return bool(validate(number))
except ValidationError:
return False
def format(number):
"""Reformat the passed number to the standard format."""
number = compact(number)
return number[:7] + '-' + number[7:]
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