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# atin.py - functions for handling ATINs
#
# Copyright (C) 2013 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
"""ATIN (U.S. Adoption Taxpayer Identification Number).
An Adoption Taxpayer Identification Number (ATIN) is a temporary
nine-digit number issued by the United States IRS for a child for whom the
adopting parents cannot obtain a Social Security Number.
>>> validate('123-45-6789')
'123456789'
>>> validate('1234-56789') # dash in the wrong place
Traceback (most recent call last):
...
InvalidFormat: ...
>>> format('123456789')
'123-45-6789'
>>> format('123') # unknown formatting is left alone
'123'
"""
import re
from stdnum.exceptions import *
from stdnum.util import clean
# regular expression for matching ATINs
_atin_re = re.compile(r'^[0-9]{3}-?[0-9]{2}-?[0-9]{4}$')
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 validate(number):
"""Check if the number is a valid ATIN. This checks the length and
formatting if it is present."""
match = _atin_re.search(clean(number, '').strip())
if not match:
raise InvalidFormat()
# sadly, no more information on ATIN number validation was found
return compact(number)
def is_valid(number):
"""Check if the number is a valid ATIN."""
try:
return bool(validate(number))
except ValidationError:
return False
def format(number):
"""Reformat the number to the standard presentation format."""
if len(number) == 9:
number = number[:3] + '-' + number[3:5] + '-' + number[5:]
return number
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