apppublic/appPublic/FiniteStateMachine.py
2019-07-16 16:33:07 +08:00

53 lines
1.2 KiB
Python
Executable File

# FiniteStateMachine.py
## a virtual State object of FSM
#
class BaseFSM(object):
def enterState(self, obj):
raise NotImplementedError()
def execState(self, obj):
raise NotImplementedError()
def exitState(self, obj):
raise NotImplementedError()
## a FMS Manager
# only need one Manager for a FSM
class FSMManager(object):
def __init__(self):
self._fsms = {}
def addState(self,state,fsm):
self._fsms[state] = fsm
def delState(self,state):
del self._fsms[state]
def getFSM(self, state):
return self._fsms[state]
def frame(self, objs, state):
for obj in objs:
if state == obj.curr_state:
obj.keepState()
else:
obj.changeState(state, self._fsms[state])
## the object with has a Finite State Machine
#
class FSMObject(object):
def attachFSM(self,state,fsm):
self.fsm_state_object = fsm
self.fsm_cur_state = state
def changeState(self,new_state,newfsm):
self.fsm_cur_state = new_state
self.fsm_state_object.exitState(self)
self.fsm_state_object = new_fsm
self.fsm_state_object.enterState(self)
self.fsm_state_object.execState(self)
def keepState(self):
self.fsm_state_object.execState(self)