From ffc824b1c63ffe474cb2cc2e736b90f919404ffb Mon Sep 17 00:00:00 2001
From: Arthur de Jong <arthur@arthurdejong.org>
Date: Sun, 12 Feb 2012 14:26:44 +0000
Subject: add a CF (Cod de înregistrare în scopuri de TVA, Romanian VAT number)
 module
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git-svn-id: http://arthurdejong.org/svn/python-stdnum/python-stdnum@123 9dea7c4f-944c-4273-ac1a-574ede026edc
---
 README                        |  1 +
 stdnum/__init__.py            |  1 +
 stdnum/ro/cf.py               | 72 +++++++++++++++++++++++++++++++++++++++++++
 tests/test_robustness.doctest |  2 +-
 4 files changed, 75 insertions(+), 1 deletion(-)
 create mode 100644 stdnum/ro/cf.py

diff --git a/README b/README
index 5214898..ab915e2 100644
--- a/README
+++ b/README
@@ -38,6 +38,7 @@ Currently this package supports the following formats:
  * CVR (Momsregistreringsnummer, Danish VAT number)
  * TVA (Numéro d'identification à la taxe sur la valeur ajoutée,
    Luxembourgian VAT number)
+ * CF (Cod de înregistrare în scopuri de TVA, Romanian VAT number)
  * IMEI (International Mobile Equipment Identity)
  * IMSI (International Mobile Subscriber Identity)
  * MEID (Mobile Equipment Identifier)
diff --git a/stdnum/__init__.py b/stdnum/__init__.py
index 3b4fa16..8f2807e 100644
--- a/stdnum/__init__.py
+++ b/stdnum/__init__.py
@@ -52,6 +52,7 @@ Currently this package supports the following formats:
  * CVR (Momsregistreringsnummer, Danish VAT number)
  * TVA (Numéro d'identification à la taxe sur la valeur ajoutée,
    Luxembourgian VAT number)
+ * CF (Cod de înregistrare în scopuri de TVA, Romanian VAT number)
  * IMEI (International Mobile Equipment Identity)
  * IMSI (International Mobile Subscriber Identity)
  * MEID (Mobile Equipment Identifier)
diff --git a/stdnum/ro/cf.py b/stdnum/ro/cf.py
new file mode 100644
index 0000000..4a32377
--- /dev/null
+++ b/stdnum/ro/cf.py
@@ -0,0 +1,72 @@
+# cf.py - functions for handling Romanian CF (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 Romanian CF (Cod de înregistrare în scopuri de TVA)
+numbers.
+
+These numbers can be from 2 to 10 digits long.
+
+>>> compact('RO 185 472 90')
+'18547290'
+>>> is_valid('185 472 90')
+True
+>>> is_valid('185 472 91')  # invalid check digit
+False
+>>> is_valid('1630615123457')  # personal code
+True
+"""
+
+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 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
+    if not number.isdigit() or number[0] == '0':
+        return False
+    if len(number) == 13:
+        # apparently a CNP can also be used (however, not all sources agree)
+        return cnp.is_valid(number)
+    elif 2 <= len(number) <= 10:
+        return calc_check_digit(number[:-1]) == number[-1]
+    return False
diff --git a/tests/test_robustness.doctest b/tests/test_robustness.doctest
index 6552f5c..b0e536f 100644
--- a/tests/test_robustness.doctest
+++ b/tests/test_robustness.doctest
@@ -39,7 +39,7 @@ invalid junk.
 >>> from stdnum.lu import tva
 >>> from stdnum.lv import pvn
 >>> from stdnum.nl import bsn, onderwijsnummer, btw
->>> from stdnum.ro import cnp
+>>> from stdnum.ro import cf, cnp
 >>> from stdnum.us import ssn
 
 Go over each imported module and try every value.
-- 
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