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# acn.py - functions for handling Australian Company Numbers (ACNs)
#
# Copyright (C) 2016 Vincent Bastos
# Copyright (C) 2016 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
"""ACN (Australian Company Number).
The Australian Company Number (ACN) is a company identifier issued by the
Australian Securities and Investments Commission.
More information:
* https://en.wikipedia.org/wiki/Australian_Company_Number
>>> validate('004 085 616')
'004085616'
>>> validate('010 499 966')
'010499966'
>>> validate('999 999 999')
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> format('004085616')
'004 085 616'
>>> to_abn('002 724 334')
'43002724334'
"""
from stdnum.exceptions import *
from stdnum.util import clean, isdigits
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, ' ').strip()
def calc_check_digit(number):
"""Calculate the checksum."""
return str((sum(int(n) * (i - 8) for i, n in enumerate(number))) % 10)
def validate(number):
"""Check if the number is a valid ACN. This checks the length, formatting
and check digit."""
number = compact(number)
if not isdigits(number):
raise InvalidFormat()
if len(number) != 9:
raise InvalidLength()
if calc_check_digit(number) != number[-1]:
raise InvalidChecksum()
return number
def is_valid(number):
"""Check if the number is a valid ACN."""
try:
return bool(validate(number))
except ValidationError:
return False
def format(number):
"""Reformat the number to the standard presentation format."""
number = compact(number)
return ' '.join((number[0:3], number[3:6], number[6:]))
def to_abn(number):
"""Convert the number to an Australian Business Number (ABN)."""
from stdnum.au import abn
number = compact(number)
return abn.calc_check_digits(number) + number
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