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"""
An advance FSM Brain architecture for allowing a true GOSUB which
saves the state of the State, and returns to continue where it left
off. Takes advantage of the new "yield" command in Python.
All states are generators. Control is handled by using "yield". Yield
passes back:
"continue" - let others have a turn, and continue
"goto" - continue processing in another state
"gosub" - go do another state as a function
"quit" - system will stop
TODO: allow system to be in multiple states simultaneously.
"""
import random, time
def process(control, level=0):
""" This function processes the states. """
command = "goto"
state = None
arg = None
while command not in ["return", "quit"]:
print "at level", level
for stepResults in control: # this is where the call is
if type(stepResults) == type(""):
command, state, arg = stepResults, None, None
else:
command, state, arg = stepResults
# -----------------------------
if command == "goto" or command == "quit":
break
elif command == "gosub":
command = process(state(*arg), level+1) # recursive
if command == "quit":
break
elif command == "return":
break
time.sleep(.001)
print "Ending level", level
if command == "goto":
control = state(*arg)
return command
def State1(*args):
""" Sample state """
print "Computing in State1"
for i in range(100):
yield "continue"
print
r = random.random()
if r < .33:
print " pre-goto..."
yield "goto", State2, (11,)
print " ERROR post-goto..." # never gets here
elif r < .66:
print " pre-gosub..."
yield "gosub", State2, (12,)
print " post-gosub..."
print "end loop..."
yield "return" # only do this when done, otherwise will loop
def State2(*args):
print "Computing in State2"
for i in range(100):
yield "continue"
print
r = random.random()
if r < .33:
print " pre-goto..."
yield "goto", State1, (11,)
print " ERROR post-goto..." # never gets here
elif r < .66:
print " pre-gosub..."
yield "gosub", State1, (12,)
print " post-gosub..."
print "end loop..."
yield "return" # only do this when done, otherwise will loop
# Get the process running:
retval = None
while retval != "quit":
retval = process(State1()) |
