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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
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="")
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)
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