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# banknote.py - functions for handling Euro banknote serial numbers
#
# Copyright (C) 2017 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
"""Euro banknote serial numbers.
The serial number consists of one letter and 11 digits, or two letters and 10
digits for the new series banknotes.
More information:
* https://en.wikipedia.org/wiki/Euro_banknotes#Serial_number
>>> validate('P36007033744')
'P36007033744'
>>> validate('P36007033743')
Traceback (most recent call last):
...
InvalidChecksum: ...
"""
from stdnum.exceptions import *
from stdnum.util import clean, isdigits
def compact(number):
"""Convert the number to the minimal representation. This strips the
number of any valid separators and removes surrounding whitespace."""
return clean(number, ' ').upper().strip()
def checksum(number):
"""Calculate the checksum over the number."""
# replace letters by their ASCII number
return sum(int(x) if isdigits(x) else ord(x) for x in number) % 9
def validate(number):
"""Check if the number is a valid banknote serial number."""
number = compact(number)
if not number[:2].isalnum() or not isdigits(number[2:]):
raise InvalidFormat()
if len(number) != 12:
raise InvalidLength()
if number[0] not in 'BCDEFGHJLMNPRSTUVWXYZ':
raise InvalidComponent()
if checksum(number) != 0:
raise InvalidChecksum()
return number
def is_valid(number):
"""Check if the number is a valid banknote serial number."""
try:
return bool(validate(number))
except ValidationError:
return False
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