python-stdnum commit: r103 - in python-stdnum: . stdnum stdnum/gr tests

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

Author: arthur
Date: Fri Feb 10 14:06:31 2012
New Revision: 103
URL: http://arthurdejong.org/viewvc/python-stdnum?revision=103&view=revision

Log:
add a FPA, ΦΠΑ (Foros Prostithemenis Aksias, the Greek VAT number) module

Added:
   python-stdnum/stdnum/gr/
   python-stdnum/stdnum/gr/__init__.py
   python-stdnum/stdnum/gr/vat.py
Modified:
   python-stdnum/README
   python-stdnum/stdnum/__init__.py
   python-stdnum/tests/test_robustness.doctest

Modified: python-stdnum/README
==============================================================================
--- python-stdnum/README        Sun Feb  5 22:12:18 2012        (r102)
+++ python-stdnum/README        Fri Feb 10 14:06:31 2012        (r103)
@@ -24,6 +24,7 @@
    company identification number)
  * SSN (U.S. Social Security Number)
  * HETU (Finnish personal identity code)
+ * FPA, ΦΠΑ (Foros Prostithemenis Aksias, the Greek 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    Sun Feb  5 22:12:18 2012        (r102)
+++ python-stdnum/stdnum/__init__.py    Fri Feb 10 14:06:31 2012        (r103)
@@ -38,6 +38,7 @@
    company identification number)
  * SSN (U.S. Social Security Number)
  * HETU (Finnish personal identity code)
+ * FPA, ΦΠΑ (Foros Prostithemenis Aksias, the Greek VAT number)
  * IMEI (International Mobile Equipment Identity)
  * IMSI (International Mobile Subscriber Identity)
  * MEID (Mobile Equipment Identifier)

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

Added: python-stdnum/stdnum/gr/vat.py
==============================================================================
--- /dev/null   00:00:00 1970   (empty, because file is newly added)
+++ python-stdnum/stdnum/gr/vat.py      Fri Feb 10 14:06:31 2012        (r103)
@@ -0,0 +1,63 @@
+# vat.py - functions for handling Greek 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 Greek VAT (Foros Prostithemenis Aksias, FPA, ΦΠΑ)
+numbers.
+
+>>> compact('GR 23456783')
+'023456783'
+>>> is_valid('EL 094259216 ')
+True
+>>> is_valid('EL 123456781')
+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('EL') or number.startswith('GR'):
+        number = number[2:]
+    if len(number) == 8:
+        number = '0' + number  # old format had 8 digits
+    return number
+
+
+def calc_check_digit(number):
+    """Calculate the check digit. The number passed should not have the
+    check digit included."""
+    checksum = 0
+    for n in number:
+        checksum = checksum * 2 + int(n)
+    return str(checksum * 2 % 11 % 10)
+
+
+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 len(number) == 9 and number.isdigit() and \
+           calc_check_digit(number[:-1]) == number[-1]

Modified: python-stdnum/tests/test_robustness.doctest
==============================================================================
--- python-stdnum/tests/test_robustness.doctest Sun Feb  5 22:12:18 2012        
(r102)
+++ python-stdnum/tests/test_robustness.doctest Fri Feb 10 14:06:31 2012        
(r103)
@@ -30,6 +30,7 @@
 >>> from stdnum.cz import rc
 >>> from stdnum.fi import hetu
 >>> from stdnum.fr import siren
+>>> from stdnum.gr import vat as gr_vat
 >>> from stdnum.iso7064 import mod_11_10, mod_11_2, mod_37_2, mod_37_36, 
 >>> mod_97_10
 >>> from stdnum.nl import bsn, onderwijsnummer, btw
 >>> from stdnum.us import ssn
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