75 lines
2.4 KiB
Python
75 lines
2.4 KiB
Python
# 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'
|
|
"""
|
|
|
|
import re
|
|
|
|
from stdnum.exceptions import *
|
|
from stdnum.util import clean
|
|
|
|
|
|
# regular expression for matching ATINs
|
|
_atin_re = re.compile('^[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):
|
|
"""Checks to see if the number provided 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):
|
|
"""Checks to see if the number provided is a valid ATIN. This checks
|
|
the length and formatting if it is present."""
|
|
try:
|
|
return bool(validate(number))
|
|
except ValidationError:
|
|
return False
|
|
|
|
|
|
def format(number):
|
|
"""Reformat the passed number to the standard format."""
|
|
if len(number) == 9:
|
|
number = number[:3] + '-' + number[3:5] + '-' + number[5:]
|
|
return number
|