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Shared/lib/python3.4/site-packages/stdnum/ro/cf.py

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+# cf.py - functions for handling Romanian CF (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
+
+"""CF (Cod de înregistrare în scopuri de TVA, Romanian VAT number).
+
+The Romanian CF is used for VAT purposes and can be from 2 to 10 digits long.
+
+>>> validate('RO 185 472 90')
+'18547290'
+>>> validate('185 472 91')
+Traceback (most recent call last):
+    ...
+InvalidChecksum: ...
+>>> validate('1630615123457')  # personal code
+'1630615123457'
+"""
+
+from stdnum.exceptions import *
+from stdnum.ro import cnp
+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('RO'):
+        number = number[2:]
+    return number
+
+
+def calc_check_digit(number):
+    """Calculate the check digit for organisations. The number passed
+    should not have the check digit included."""
+    weights = (7, 5, 3, 2, 1, 7, 5, 3, 2)
+    number = (9 - len(number)) * '0' + number
+    check = 10 * sum(weights[i] * int(n) for i, n in enumerate(number))
+    return str(check % 11 % 10)
+
+
+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[0] == '0':
+        raise InvalidFormat()
+    if len(number) == 13:
+        # apparently a CNP can also be used (however, not all sources agree)
+        cnp.validate(number)
+    elif 2 <= len(number) <= 10:
+        if calc_check_digit(number[:-1]) != number[-1]:
+            raise InvalidChecksum()
+    else:
+        raise InvalidLength()
+    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