#!/usr/bin/env python3 # # Copyright (C) 2021 VyOS maintainers and contributors # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License version 2 or later as # published by the Free Software Foundation. # # This program 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 General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. import re import sys import argparse class MalformedRange(Exception): pass def validate_range(value, min=None, max=None): try: lower, upper = re.match(r'^(\d+)-(\d+)$', value).groups() lower, upper = int(lower), int(upper) if int(lower) > int(upper): raise MalformedRange("the lower bound exceeds the upper bound".format(value)) if min is not None: if lower < min: raise MalformedRange("the lower bound must not be less than {}".format(min)) if max is not None: if upper > max: raise MalformedRange("the upper bound must not be greater than {}".format(max)) except (AttributeError, ValueError): raise MalformedRange("range syntax error") parser = argparse.ArgumentParser(description='Range validator.') parser.add_argument('--min', type=int, action='store') parser.add_argument('--max', type=int, action='store') parser.add_argument('value', action='store') if __name__ == '__main__': args = parser.parse_args() try: validate_range(args.value, min=args.min, max=args.max) except MalformedRange as e: print("Incorrect range '{}': {}".format(args.value, e)) sys.exit(1)