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Shared/lib/python3.4/site-packages/stdnum/cy/vat.py

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+# vat.py - functions for handling Cypriot 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
+
+"""Αριθμός Εγγραφής Φ.Π.Α. (Cypriot VAT number).
+
+The Cypriot Αριθμός Εγγραφής Φ.Π.Α. (VAT) number consists of 9 digits
+where the last one is a is a letter and functions as a check digit.
+
+>>> compact('CY-10259033P')
+'10259033P'
+>>> validate('CY-10259033P ')
+'10259033P'
+>>> validate('CY-10259033Z')  # invalid check digit
+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('CY'):
+        number = number[2:]
+    return number
+
+
+def calc_check_digit(number):
+    """Calculate the check digit. The number passed should not have the
+    check digit included."""
+    translation = {
+        '0': 1, '1': 0, '2': 5, '3': 7, '4': 9,
+        '5': 13, '6': 15, '7': 17, '8': 19, '9': 21,
+    }
+    return 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'[(
+        sum(translation[x] for x in number[::2]) +
+        sum(int(x) for x in number[1::2])
+    ) % 26]
+
+
+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[:-1].isdigit():
+        raise InvalidFormat()
+    if len(number) != 9:
+        raise InvalidLength()
+    if number[0:2] == '12':
+        raise InvalidComponent()
+    if number[-1] != calc_check_digit(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