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#!/usr/bin/env python3
class Serial:
modulus = 2 ** 32
def __init__(self, val):
self._val = int(val)
if self._val < 0 or self._val >= self.modulus:
raise ValueError
def __add__(self, val):
val = int(val)
if val < 0 or val > (self.modulus - 1) >> 1:
raise ValueError
return type(self)((self._val + val) & (self.modulus - 1))
def __le__(self, other):
return (self.modulus - int(self) + int(other)) & (self.modulus >> 1) == 0
def __ge__(self, other):
return (self.modulus + int(self) - int(other)) & (self.modulus >> 1) == 0
def __eq__(self, other):
return int(self) == int(other)
def __ne__(self, other):
return int(self) != int(other)
def __lt__(self, other):
return self != other and self <= other
def __gt__(self, other):
return self != other and self >= other
def __int__(self):
return self._val
def __str__(self):
return f"{int(self):{len(str(self.modulus))}d}"
def find_intermediate(start, finish):
if start < finish:
return None
else:
wrap = start + ((Serial.modulus >> 1) - 2)
assert start < wrap and wrap < finish
return wrap
def main():
from argparse import ArgumentParser
ap = ArgumentParser()
ap.add_argument("start", type = Serial)
ap.add_argument("finish", type = Serial)
args = ap.parse_args()
wrap = find_intermediate(args.start, args.finish)
print(f"Start at {args.start!s}")
if wrap is None:
print("No step needed")
else:
print(f"Step via {wrap!s}")
print(f"End at {args.finish!s}")
if __name__ == "__main__":
main()
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