Switch to python3

Shared/lib/python3.4/site-packages/stdnum/si/ddv.py

@@ -0,0 +1,75 @@
+# ddv.py - functions for handling Slovenian VAT numbers
+# coding: utf-8
+#
+# Copyright (C) 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
+
+"""ID za DDV (Davčna številka, Slovenian VAT number).
+
+The DDV number (Davčna številka) is used for VAT (DDV, Davek na dodano
+vrednost) purposes and consist of 8 digits of which the last is a check
+digit.
+
+>>> validate('SI 5022 3054')
+'50223054'
+>>> validate('SI 50223055')  # invalid check digits
+Traceback (most recent call last):
+    ...
+InvalidChecksum: ...
+"""
+
+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, ' -').upper().strip()
+    if number.startswith('SI'):
+        number = number[2:]
+    return number
+
+
+def calc_check_digit(number):
+    """Calculate the check digit. The number passed should not have the
+    check digit included."""
+    check = (11 - sum((8 - i) * int(n) for i, n in enumerate(number)) % 11)
+    # this results in a two-digit check digit for 11 which should be wrong
+    return '0' if check == 10 else str(check)
+
+
+def validate(number):
+    """Checks to see if the number provided is a valid VAT number. This
+    checks the length, formatting and check digit."""
+    number = compact(number)
+    if not number.isdigit() or number.startswith('0'):
+        raise InvalidFormat()
+    if len(number) != 8:
+        raise InvalidLength()
+    if calc_check_digit(number[:-1]) != number[-1]:
+        raise InvalidChecksum()
+    return number
+
+
+def is_valid(number):
+    """Checks to see if the number provided is a valid VAT number. This
+    checks the length, formatting and check digit."""
+    try:
+        return bool(validate(number))
+    except ValidationError:
+        return False