def read_int_twice_io(
t_pre: Place,
number1: int = Result(),
number2: int = Result(),
t_post: Place = Result(),
) -> bool:
Terminates(False)
return IOExists1(Place)(
lambda t2: (
read_int_io(t_pre, number1, t2) and
read_int_io(t2, number2, t_post)
)
)
def read_int2(t1: Place) -> Tuple[int, int, Place]:
IOExists4(Place, Place, int, int)(lambda t3, t2, value1, value2: (
Requires(
token(t1, 2) and read_int_io(t1, value1, t2) and read_int_io(
t2, value2, t3)),
Ensures(
token(t3) and t3 == Result()[2] and value1 == Result()[0] and
value2 == Result()[1]),
))
t2, number1 = read_int(t1)
t3, number2 = read_int(t2)
return number1, number2, t3
def read_write_int2(t1: Place) -> Place:
IOExists6(Place, Place, Place, Place, int,
int)(lambda t2, t3, t4, t5, value1, value2: (
Requires(
token(t1, 2) and read_int_io(t1, value1, t2) and
read_int_io(t2, value2, t3) and write_int_io(
t3, value1, t4) and write_int_io(t4, value2, t5)),
Ensures(token(t5) and t5 == Result()),
))
t2, number1 = read_int(t1)
t3, number2 = read_int(t2)
t4 = write_int(t3, number1)
t5 = write_int(t4, number2)
return t5
def read_int3(t1: Place) -> Tuple[int, int, Place]:
IOExists4(Place, Place, int, int)(
lambda t3, t2, value1, value2: (
Requires(
token(t1, 2) and read_int_io(t1, value1, t2) and read_int_io(
t2, value2, t3)),
Ensures(
#:: ExpectedOutput(postcondition.violated:assertion.false)
token(t3) and t3 == Result()[2] and value1 == Result()[0] and
value2 == Result()[1]),
))
t2, number1 = read_int(t1)
t3, number2 = read_int(t2)
return number2, number1, t3
def read_write_int3(t1: Place) -> Place:
IOExists6(Place, Place, Place, Place, int,
int)(lambda t2, t3, t4, t5, value1, value2: (
Requires(
token(t1, 2) and read_int_io(t1, value1, t2) and
read_int_io(t2, value2, t3) and write_int_io(
t3, value1, t4) and write_int_io(t4, value2, t5)),
Ensures(token(t5) and t5 == Result()),
))
t2, number1 = read_int(t1)
t3, number2 = read_int(t2)
#:: ExpectedOutput(call.precondition:insufficient.permission)
t4 = write_int(t3, number2)
#:: ExpectedOutput(carbon)(call.precondition:insufficient.permission)
t5 = write_int(t4, number1)
return t5
def read_int1(t1: Place) -> Tuple[int, Place]:
IOExists2(Place, int)(lambda t2, value: (
Requires(token(t1, 2) and read_int_io(t1, value, t2)),
Ensures(token(t2) and t2 == Result()[1] and value == Result()[0]),
))
t2, number = read_int(t1)
return number, t2
def read_int(self, t1: Place) -> Tuple[int, Place]:
IOExists2(Place, int)(lambda t2_new, value_new: (
Requires(token(t1, 2) and read_int_io(t1, value_new, t2_new)),
Ensures(
token(t2_new) and t2_new == Result()[1] and value_new ==
Result()[0]),
))
t2_new, number_new = read_int(t1)
return number_new, t2_new
def read_write_int1(t1: Place) -> Place:
IOExists3(Place, Place, int)(lambda t2, t3, value: (
Requires(
token(t1, 2) and read_int_io(t1, value, t2) and write_int_io(
t2, value, t3)),
Ensures(token(t3) and t3 == Result()),
))
t2, number = read_int(t1)
t3 = write_int(t2, number)
return t3
def write_only_positive(t1: Place) -> Place:
IOExists3(Place, Place, int)(lambda t2, t3, value: (
Requires(
token(t1, 2) and read_int_io(t1, value, t2) and write_int_io(
t2, value, t3)),
Ensures((token(t3) and t3 == Result()) if value > 0 else (token(
t2) and write_int_io(t2, value, t3) and t2 == Result())),
))
t2, number = read_int(t1)
if number > 0:
t3 = write_int(t2, number)
else:
t3 = t2
return t3
def write_non_negative(t1: Place) -> Place:
IOExists3(Place, Place, int)(lambda t2, t3, value: (
Requires(
token(t1, 2) and read_int_io(t1, value, t2) and
(write_int_io(t2, value, t3)
if value >= 0 else write_int_io(t2, -value, t3))),
Ensures(token(t3) and t3 == Result()),
))
t2, number = read_int(t1)
if number >= 0:
t3 = write_int(t2, number)
else:
t3 = write_int(t2, -number)
return t3