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# postcode.py - functions for handling Dutch postal codes
#
# 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
"""Postcode (Dutch postal code).
The Dutch postal code consists of four numbers followed by two letters.
>>> validate('2601 DC')
'2601 DC'
>>> validate('NL-2611ET')
'2611 ET'
>>> validate('26112 ET')
Traceback (most recent call last):
...
InvalidFormat: ...
>>> validate('2611 SS') # a few letter combinations are banned
Traceback (most recent call last):
...
InvalidComponent: ...
"""
import re
from stdnum.exceptions import *
from stdnum.util import clean
_postcode_re = re.compile(r'^(?P<pt1>[1-9][0-9]{3})(?P<pt2>[A-Z]{2})$')
_postcode_blacklist = ('SA', 'SD' ,'SS')
def compact(number):
"""Convert the number to the minimal representation. This strips the
number of any valid separators and removes surrounding whitespace."""
number = clean(number, ' -').upper().strip()
if number.startswith('NL'):
number = number[2:]
return number
def validate(number):
"""Checks to see if the number provided is in the correct format.
This currently does not check whether the code corresponds to a real
address."""
number = compact(number)
match = _postcode_re.search(number)
if not match:
raise InvalidFormat()
if match.group('pt2') in _postcode_blacklist:
raise InvalidComponent()
return '%s %s' % (match.group('pt1'), match.group('pt2'))
def is_valid(number):
"""Checks to see if the number provided is a valid postal code."""
try:
return bool(validate(number))
except ValidationError:
return False
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