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#!/usr/bin/env python3
#
# numeric value validator
#
# Copyright (C) 2017 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
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# 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 sys
import argparse
if __name__ == '__main__':
parser = argparse.ArgumentParser()
parser.add_argument("-f", "--float", action="store_true", help="Accept floating point values")
group = parser.add_mutually_exclusive_group()
group.add_argument("-r", "--range", type=str, help="Check if the number is within range (inclusive), example: 1024-65535", action='append')
group.add_argument("-n", "--non-negative", action="store_true", help="Check if the number is non-negative (>= 0)")
group.add_argument("-p", "--positive", action="store_true", help="Check if the number is positive (> 0)")
parser.add_argument("number", type=str, help="Number to validate")
args = parser.parse_args()
if args.float:
converter = float
name = 'floating point'
else:
converter = int
name = 'integer'
try:
number = converter(args.number)
except:
sys.exit(f'{args.number} is not a valid {name} number')
if args.range:
try:
for r in args.range:
_lower, _upper = r.split('-')
lower = int(_lower)
upper = int(_upper)
except:
sys.exit(f'{args.range} is not a valid number range')
if number < lower or number > upper:
span = args.range if len(args.range) > 1 else args.range[0]
sys.exit('Number {number} is not in the range {span}')
elif args.non_negative and number < 0:
sys.exit('Number should be non-negative')
elif args.positive and number <= 0:
sys.exit('Number should be positive')
sys.exit()
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