python-stdnum commit: r141 - in python-stdnum: . stdnum stdnum/si tests

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

Author: arthur
Date: Sat Feb 18 16:05:46 2012
New Revision: 141
URL: http://arthurdejong.org/viewvc/python-stdnum?revision=141&view=revision

Log:
add a ID za DDV (Davčna številka, Slovenian VAT number) module

Added:
   python-stdnum/stdnum/si/
   python-stdnum/stdnum/si/__init__.py
   python-stdnum/stdnum/si/ddv.py
Modified:
   python-stdnum/README
   python-stdnum/stdnum/__init__.py
   python-stdnum/tests/test_robustness.doctest

Modified: python-stdnum/README
==============================================================================
--- python-stdnum/README        Sat Feb 18 15:16:27 2012        (r140)
+++ python-stdnum/README        Sat Feb 18 16:05:46 2012        (r141)
@@ -54,6 +54,7 @@
    VAT number)
  * VAT (Maltese VAT number)
  * NIP (Numer Identyfikacji Podatkowej, Polish VAT number)
+ * ID za DDV (Davčna številka, Slovenian VAT number)
  * IMEI (International Mobile Equipment Identity)
  * IMSI (International Mobile Subscriber Identity)
  * MEID (Mobile Equipment Identifier)

Modified: python-stdnum/stdnum/__init__.py
==============================================================================
--- python-stdnum/stdnum/__init__.py    Sat Feb 18 15:16:27 2012        (r140)
+++ python-stdnum/stdnum/__init__.py    Sat Feb 18 16:05:46 2012        (r141)
@@ -68,6 +68,7 @@
    VAT number)
  * VAT (Maltese VAT number)
  * NIP (Numer Identyfikacji Podatkowej, Polish VAT number)
+ * ID za DDV (Davčna številka, Slovenian VAT number)
  * IMEI (International Mobile Equipment Identity)
  * IMSI (International Mobile Subscriber Identity)
  * MEID (Mobile Equipment Identifier)

Added: python-stdnum/stdnum/si/__init__.py
==============================================================================

Added: python-stdnum/stdnum/si/ddv.py
==============================================================================
--- /dev/null   00:00:00 1970   (empty, because file is newly added)
+++ python-stdnum/stdnum/si/ddv.py      Sat Feb 18 16:05:46 2012        (r141)
@@ -0,0 +1,64 @@
+# ddv.py - functions for handling Slovenian VAT numbers
+# coding: utf-8
+#
+# 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
+
+"""Module for handling Slovenian ID za DDV (Davčna številka, Davek na
+dodano vrednost, VAT) numbers.
+
+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.
+
+>>> compact('SI 5022 3054')
+'50223054'
+>>> is_valid('SI 50223054')
+True
+>>> is_valid('SI 50223055')  # invalid check digits
+False
+"""
+
+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 is_valid(number):
+    """Checks to see if the number provided is a valid VAT number. This
+    checks the length, formatting and check digit."""
+    try:
+        number = compact(number)
+    except:
+        return False
+    return number.isdigit() and len(number) == 8 and number[0] != '0' and \
+           calc_check_digit(number[:-1]) == number[-1]

Modified: python-stdnum/tests/test_robustness.doctest
==============================================================================
--- python-stdnum/tests/test_robustness.doctest Sat Feb 18 15:16:27 2012        
(r140)
+++ python-stdnum/tests/test_robustness.doctest Sat Feb 18 16:05:46 2012        
(r141)
@@ -50,6 +50,7 @@
 >>> from stdnum.pl import nip
 >>> from stdnum.pt import nif as pt_nif
 >>> from stdnum.ro import cf, cnp
+>>> from stdnum.si import ddv
 >>> from stdnum.sk import dph
 >>> from stdnum.us import ssn
 
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