blob: 60a142143815a55f3190618fa1cc7cfa3f536325 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
# mva.py - functions for handling Norwegian VAT numbers
# coding: utf-8
#
# Copyright (C) 2015 Tuomas Toivonen
# Copyright (C) 2015 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
"""MVA (Merverdiavgift, Norwegian VAT number).
The VAT number is the standard Norwegian organisation number
(Organisasjonsnummer) with 'MVA' as suffix.
>>> validate('NO 995 525 828 MVA')
'995525828MVA'
>>> validate('NO 995 525 829 MVA')
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> format('995525828MVA')
'NO 995 525 828 MVA'
"""
from stdnum.exceptions import *
from stdnum.no import orgnr
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('NO'):
number = number[2:]
return number
def validate(number):
"""Check if the number is a valid MVA number. This checks the length,
formatting and check digit."""
number = compact(number)
if not number.endswith('MVA'):
raise InvalidFormat()
orgnr.validate(number[:-3])
return number
def is_valid(number):
"""Check if the number is a valid MVA number."""
try:
return bool(validate(number))
except ValidationError:
return False
def format(number):
"""Reformat the number to the standard presentation format."""
number = compact(number)
return 'NO ' + orgnr.format(number[:9]) + ' ' + number[9:]
|