You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
2.1 KiB
75 lines
2.1 KiB
import stormpy
|
|
from stormpy.examples.files import prism_dtmc_die
|
|
|
|
class _DfsQueue:
|
|
def __init__(self):
|
|
self.queue = []
|
|
self.visited = set()
|
|
|
|
def push(self, state_id):
|
|
if state_id not in self.visited:
|
|
self.queue.append(state_id)
|
|
self.visited.add(state_id)
|
|
|
|
def pop(self):
|
|
if len(self.queue) > 0:
|
|
return self.queue.pop()
|
|
return None
|
|
|
|
|
|
def _dfs_explore(program, callback):
|
|
generator = stormpy.StateGenerator(program)
|
|
|
|
queue = _DfsQueue()
|
|
current_state_id = generator.load_initial_state()
|
|
queue.visited.add(current_state_id)
|
|
|
|
while True:
|
|
callback(current_state_id, generator)
|
|
|
|
successors = generator.expand()
|
|
assert len(successors) <= 1
|
|
for choice in successors:
|
|
for state_id, _prob in choice:
|
|
queue.push(state_id)
|
|
current_state_id = queue.pop()
|
|
if current_state_id is None:
|
|
break
|
|
generator.load(current_state_id)
|
|
|
|
|
|
def _load_program(filename):
|
|
program = stormpy.parse_prism_program(filename) # pylint: disable=no-member
|
|
program = program.substitute_constants()
|
|
|
|
expression_parser = stormpy.ExpressionParser(program.expression_manager)
|
|
expression_parser.set_identifier_mapping(
|
|
{var.name: var.get_expression()
|
|
for var in program.variables})
|
|
return program, expression_parser
|
|
|
|
|
|
def _find_variable(program, name):
|
|
for var in program.variables:
|
|
if var.name is name:
|
|
return var
|
|
return None
|
|
|
|
def test_knuth_yao_die():
|
|
program, expression_parser = _load_program(prism_dtmc_die)
|
|
s_variable = _find_variable(program, "s")
|
|
upper_bound_invariant = expression_parser.parse("d <= 6")
|
|
|
|
number_states = 0
|
|
|
|
def callback(_state_id, generator):
|
|
nonlocal number_states
|
|
number_states += 1
|
|
|
|
valuation = generator.current_state_to_valuation()
|
|
print(valuation)
|
|
assert valuation.integer_values[s_variable] <= 7
|
|
assert generator.current_state_satisfies(upper_bound_invariant)
|
|
|
|
_dfs_explore(program, callback)
|
|
assert number_states == 13
|