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# ruc.py - functions for handling Ecuadorian fiscal numbers
# coding: utf-8
#
# Copyright (C) 2014 Jonathan Finlay
# Copyright (C) 2014-2015 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
"""RUC (Registro Único de Contribuyentes, Ecuadorian company tax number).
The RUC is a tax identification number for legal entities. It has 13 digits
where the third digit is a number denoting the type of entity.
>>> validate('1792060346-001')
'1792060346001'
>>> validate('1763154690001') # invalid check digit
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> validate('179206034601') # too short
Traceback (most recent call last):
...
InvalidLength: ...
"""
from stdnum.ec import ci
from stdnum.exceptions import *
__all__ = ['compact', 'validate', 'is_valid']
# use the same compact function as CI
compact = ci.compact
def _checksum(number, weights):
"""Calculate a checksum over the number given the weights."""
return sum(w * int(n) for w, n in zip(weights, number)) % 11
def validate(number):
"""Check if the number provided is a valid RUC number. This checks the
length, formatting, check digit and check sum."""
number = compact(number)
if len(number) != 13:
raise InvalidLength()
if not number.isdigit():
raise InvalidFormat()
if number[:2] < '01' or number[:2] > '24':
raise InvalidComponent() # invalid province code
if number[2] < '6':
# 0..5 = natural RUC: CI plus establishment number
if number[-3:] == '000':
raise InvalidComponent() # establishment number wrong
ci.validate(number[:10])
elif number[2] == '6':
# 6 = public RUC
if number[-4:] == '0000':
raise InvalidComponent() # establishment number wrong
if _checksum(number[:9], (3, 2, 7, 6, 5, 4, 3, 2, 1)) != 0:
raise InvalidChecksum()
elif number[2] == '9':
# 9 = juridical RUC
if number[-3:] == '000':
raise InvalidComponent() # establishment number wrong
if _checksum(number[:10], (4, 3, 2, 7, 6, 5, 4, 3, 2, 1)) != 0:
raise InvalidChecksum()
else:
raise InvalidComponent() # third digit wrong
return number
def is_valid(number):
"""Check if the number provided is a valid RUC number. This checks the
length, formatting and check digit."""
try:
return bool(validate(number))
except ValidationError:
return False
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