96 lines
3 KiB
Python
96 lines
3 KiB
Python
# moa.py - functions for handling Memorandum of Association Number
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#
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# Copyright (C) 2021 Piruin Panichphol
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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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"""MOA (Thailand Memorandum of Association Number).
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Memorandum of Association Number (aka Company's Taxpayer Identification
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Number) are numbers issued by the Department of Business Development.
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The number consists of 13 digits of which the last is a check digit following
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the same algorithm as in the Personal Identity Number (PIN). It uses a
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different grouping format and always starts with zero to indicate that the
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number issued by DBD.
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More information:
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* https://www.dbd.go.th/download/pdf_kc/s09/busin_2542-48.pdf
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>>> compact('0 10 5 536 11201 4')
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'0105536112014'
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>>> validate('0994000617721')
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'0994000617721'
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>>> validate('0-99-4-000-61772-1')
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'0994000617721'
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>>> validate('0-99-4-000-61772-3')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> format('0993000133978')
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'0-99-3-000-13397-8'
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"""
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from __future__ import annotations
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from stdnum.exceptions import *
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from stdnum.th import pin
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from stdnum.util import clean, isdigits
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__all__ = ['compact', 'calc_check_digit', 'validate', 'is_valid', 'format']
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# use the same calc_check_digit function as PIN
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calc_check_digit = pin.calc_check_digit
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def compact(number: str) -> str:
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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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return clean(number, ' -').strip()
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def validate(number: str) -> str:
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"""Check if the number is a valid MOA Number. This checks the length,
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formatting, component and check digit."""
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number = compact(number)
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if len(number) != 13:
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raise InvalidLength()
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if not isdigits(number):
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raise InvalidFormat()
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if number[0] != '0':
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raise InvalidComponent()
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if number[-1] != calc_check_digit(number):
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raise InvalidChecksum()
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return number
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def is_valid(number: str) -> bool:
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"""Check whether the number is valid."""
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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: str) -> str:
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"""Reformat the number to the standard presentation format."""
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number = compact(number)
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return '-'.join((
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number[:1], number[1:3], number[3:4], number[4:7], number[7:12],
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number[12:]))
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