Open Media Library Platform

Shared/lib/python2.7/site-packages/stdnum/lu/__init__.py

@@ -0,0 +1,24 @@
+# __init__.py - collection of Luxembourgian 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
+
+"""Collection of Luxembourgian numbers."""
+
+# provide vat as an alias
+from stdnum.lu import tva as vat

Shared/lib/python2.7/site-packages/stdnum/lu/tva.py

@@ -0,0 +1,72 @@
+# tva.py - functions for handling Luxembourgian 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
+
+"""TVA (taxe sur la valeur ajoutée, Luxembourgian VAT number).
+
+The n° TVA (Numéro d'identification à la taxe sur la valeur ajoutée) is
+used for tax purposes in Luxembourg. The number consists of 8 digits of
+which the last two are check digits.
+
+>>> validate('LU 150 274 42')
+'15027442'
+>>> validate('150 274 43')  # 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('LU'):
+        number = number[2:]
+    return number
+
+
+def calc_check_digits(number):
+    """Calculate the check digits for the number."""
+    return '%02d' % (int(number) % 89)
+
+
+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():
+        raise InvalidFormat()
+    if len(number) != 8:
+        raise InvalidLength()
+    if calc_check_digits(number[:6]) != number[-2:]:
+        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