91 lines
2.9 KiB
Python
91 lines
2.9 KiB
Python
# rut.py - functions for handling Chile RUT/RUN numbers
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# coding: utf-8
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#
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# Copyright (C) 2008-2011 Cédric Krier
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# Copyright (C) 2008-2011 B2CK
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# Copyright (C) 2015 Arthur de Jong
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301 USA
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"""RUT (Rol Único Tributario, Chilean national tax number).
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The RUT, the Chilean national tax number is the same as the RUN (Rol Único
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Nacional) the Chilean national identification number. The number consists of
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8 digits, followed by a check digit.
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>>> validate('76086428-5')
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'760864285'
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>>> validate('CL 12531909-2')
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'125319092'
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>>> validate('12531909-3')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('76086A28-5')
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Traceback (most recent call last):
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...
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InvalidFormat: ...
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>>> format('125319092')
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'12.531.909-2'
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"""
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from stdnum.exceptions import *
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from stdnum.util import clean
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def compact(number):
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"""Convert the number to the minimal representation. This strips the
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number of any valid separators and removes surrounding whitespace."""
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number = clean(number, ' -.').upper().strip()
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if number.startswith('CL'):
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number = number[2:]
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return number
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def calc_check_digit(number):
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"""Calculate the check digit. The number passed should not have the
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check digit included."""
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s = sum(int(n) * (4 + (5 - i) % 6) for i, n in enumerate(number[::-1]))
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return '0123456789K'[s % 11]
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def validate(number):
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"""Checks to see if the number provided is a valid number. This
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checks the length, formatting and check digit."""
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number = compact(number)
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if len(number) not in (8, 9):
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raise InvalidLength()
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if not number[:-1].isdigit():
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raise InvalidFormat()
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if number[-1] != calc_check_digit(number[:-1]):
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raise InvalidChecksum()
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return number
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def is_valid(number):
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"""Checks to see if the number provided is a valid number. This
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checks the length, formatting and check digit."""
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try:
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return bool(validate(number))
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except ValidationError:
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return False
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def format(number):
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"""Reformat the passed number to the standard format."""
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number = compact(number)
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return (number[:-7] + '.' + number[-7:-4] + '.' +
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number[-4:-1] + '-' + number[-1])
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