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Shared/lib/python3.4/site-packages/stdnum/nl/bsn.py

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+# bsn.py - functions for handling BSNs
+#
+# Copyright (C) 2010, 2011, 2012, 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
+
+"""BSN (Burgerservicenummer, Dutch national identification number).
+
+The BSN is a number with up to 9 digits (the leading 0's are commonly left
+out) which is used as the Dutch national identification number.
+
+>>> validate('1112.22.333')
+'111222333'
+>>> validate('1112.52.333')
+Traceback (most recent call last):
+    ...
+InvalidChecksum: ...
+>>> validate('1112223334')
+Traceback (most recent call last):
+    ...
+InvalidLength: ...
+>>> format('111222333')
+'1112.22.333'
+"""
+
+from stdnum.exceptions import *
+from stdnum.util import clean
+
+
+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, ' -.').strip()
+    # pad with leading zeroes
+    return (9 - len(number)) * '0' + number
+
+
+def checksum(number):
+    """Calculate the checksum over the number. A valid number should have
+    a check digit of 0."""
+    return (sum((9 - i) * int(n) for i, n in enumerate(number[:-1])) -
+            int(number[-1])) % 11
+
+
+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)
+    if not number.isdigit() or int(number) <= 0:
+        raise InvalidFormat()
+    if len(number) != 9:
+        raise InvalidLength()
+    if checksum(number) != 0:
+        raise InvalidChecksum()
+    return number
+
+
+def is_valid(number):
+    """Checks to see if the number provided is a valid BSN. This checks
+    the length and whether the check digit is correct."""
+    try:
+        return bool(validate(number))
+    except ValidationError:
+        return False
+
+
+def format(number):
+    """Reformat the passed number to the standard format."""
+    number = compact(number)
+    return number[:4] + '.' + number[4:6] + '.' + number[6:]