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# pps.py - functions for handling Irish PPS numbers
#
# Copyright (C) 2012 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
"""PPS No (Personal Public Service Number, Irish personal number).
The Personal Public Service number consists of 8 digits. The first seven
are numeric and the last is the check character. The number is sometimes
be followed by an extra letter that can be a 'W', 'T' or an 'X' and is
ignored for the check algorithm.
>>> compact('6433435F')
'6433435F'
>>> is_valid('6433435F')
True
>>> is_valid('6433435E') # incorrect check digit
False
"""
import re
from stdnum.util import clean
from stdnum.ie import vat
pps_re = re.compile('^\d{7}[A-W][WTX]?$')
"""Regular expression used to check syntax of PPS numbers."""
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, ' -').upper().strip()
def is_valid(number):
"""Checks to see if the number provided is a valid PPS number. This
checks the length, formatting and check digit."""
try:
number = compact(number)
except:
return False
if not pps_re.match(number):
return False
return number[7] == vat.calc_check_digit(number[:7])
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