#!/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 import re 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") 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() # Try to load the argument number = None if args.float: try: number = float(args.number) except: print("{0} is not a valid floating point number".format(args.number), file=sys.stderr) sys.exit(1) else: try: number = int(args.number) except: print("{0} is not a valid integer number".format(args.number), file=sys.stderr) sys.exit(1) if args.range: try: lower, upper = re.match(r'(\d+)\s*\-\s*(\d+)', args.range).groups() lower, upper = int(lower), int(upper) except: print("{0} is not a valid number range",format(args.range), file=sys.stderr) sys.exit(1) if (number < lower) or (number > upper): print("Number {0} is not in the {1} range".format(number, args.range), file=sys.stderr) sys.exit(1) elif args.non_negative: if number < 0: print("Number should be non-negative", file=sys.stderr) sys.exit(1) elif args.positive: if number <= 0: print("Number should be positive", file=sys.stderr) sys.exit(1)