python-stdnum commit: r5 - python-stdnum/stdnum

["Commits of the python-stdnum project." <python-stdnum-commits [at] lists.arthurdejong.org>]

Author: arthur
Date: Fri Jul 23 21:13:39 2010
New Revision: 5
URL: http://arthurdejong.org/viewvc/python-stdnum?view=rev&revision=5

Log:
add BSN (Burgerservicenummer, the Ducth national identification number) module

Added:
   python-stdnum/stdnum/bsn.py

Added: python-stdnum/stdnum/bsn.py
==============================================================================
--- /dev/null   00:00:00 1970   (empty, because file is newly added)
+++ python-stdnum/stdnum/bsn.py Fri Jul 23 21:13:39 2010        (r5)
@@ -0,0 +1,57 @@
+# bsn.py - functions for handling BSNs
+#
+# Copyright (C) 2010 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
+
+"""Module for handling BSNs (Burgerservicenummer), the
+Ducth national identification number.
+
+>>> validate('111222333')
+True
+>>> validate('111252333')
+False
+>>> compact('1234.56.782')
+'123456782'
+>>> format('111222333')
+'1112.22.333'
+"""
+
+
+def compact(number):
+    """Convert the number to the minimal representation. This strips the
+    number of any valid separators and removes surrounding whitespace."""
+    number = number.replace(' ','').replace('-','').replace('.','').strip()
+    # padd with leading zeroes
+    return (9 - len(number)) * '0' + number
+
+def _calc_checksum(number):
+    """Calculate the checksum over the number."""
+    return sum( (9-i) * int(number[i]) for i in range(8) ) - int(number[8])
+
+def validate(number):
+    """Checks to see if the number provided is a valid BSN. This checks
+    the length and whether the check digit is correct."""
+    number = compact(number)
+    return len(number) == 9 and \
+           number.isdigit() and \
+           int(number) > 0 and \
+           _calc_checksum(number) % 11 == 0
+
+def format(number):
+    """Reformat the passed number to the standard format."""
+    number = compact(number)
+    return number[:4] + '.' + number[4:6] + '.' + number[6:]
--
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