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#!/usr/bin/env python3
import sys, re, traceback
from argparse import ArgumentParser
def convert(s):
if s.lower().startswith('0x'):
return int(s, 16)
elif s.lower().startswith('0b'):
return int(s, 2)
else:
return int(s)
class Table:
def __init__(self, value, numbers):
self.value = value
self.numbers = numbers
def print(self):
self.print_border()
self.print_numbers()
self.print_border()
self.print_bits()
self.print_border()
def print_border(self):
total_w = 4 * len(self.numbers) + 2
for i in range(total_w):
c = '+' if i == 0 or i == total_w-1 else '-'
print(c, end='')
print()
def print_numbers(self):
print('|', end='')
for n in reversed(self.numbers):
print(' %s ' % (str(n).rjust(2)), end='')
print('|')
def print_bits(self):
print('|', end='')
for n in reversed(self.numbers):
b = (self.value >> n) & 1
print(' %s ' % (str(b).rjust(2)), end='')
print('|')
def main():
parser = ArgumentParser(description='inspect values by bits')
parser.add_argument('-s', '--size', type=int, default=32, choices=(4, 8, 16, 32, 64),
help='size')
parser.add_argument('-r', '--range',
help='range (e.g. 31:28), numbers are inclusive')
parser.add_argument('value')
args = parser.parse_args()
value = convert(args.value)
if value.bit_length() > args.size:
raise Exception('bit length of %s is %d which is larger than specified size %d'
% (args.value, value.bit_length(), args.size))
if args.range:
r = re.search('^(\d+):(\d+)$', args.range)
if not r:
raise Exception('invalid range specified')
r_to = int(r.group(2))
r_from = int(r.group(1))
if r_to < 0 or r_from < 0 or r_to >= args.size or r_from >= args.size:
raise Exception('specified range is out of bounds')
else:
r_to = 0
r_from = args.size - 1
numbers = range(r_to, r_from + 1)
table = Table(value, numbers)
table.print()
print()
print(' Input: %s' % args.value)
print(' Binary: %s' % bin(value)[2:])
print('Decimal: %d' % value)
print(' Hex: %s' % hex(value)[2:])
print()
if args.range:
new_value = value >> r_to
mask = (2 ** (r_from - r_to + 1) - 1)
new_value &= mask
print(' [%d:%d]' % (r_from, r_to))
print(' Binary: %s' % bin(new_value)[2:])
print('Decimal: %d' % new_value)
print(' Hex: %s' % hex(new_value)[2:])
if __name__ == '__main__':
try:
main()
except Exception as e:
print("error: %s" % str(e))
traceback.print_tb(e.__traceback__)
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