import lib601.sm as sm class RobotMoves(sm.SM): legalInputs = ['left','right','down','up'] startState = None def __init__(self,s): self.s = s self.goal = (3,4) def getNextValues(self, state, inp): if state == None: state = self.s nextState = list(state) if inp not in self.legalInputs: return (state,state) else: if inp == 'left': nextState[0] -= 1 elif inp == 'right': nextState[0] += 1 elif inp == 'up': nextState[1] += 1 elif inp == 'down': nextState[1] -= 1 nextState = tuple(nextState) return (nextState, nextState) def done(self, state): return state == self.goal sm = RobotMoves((0,0)) sm.transduce(['up','right','right','up','up','right','up','right','up'],verbose = True)
if self.doesAnyoneDie(nextState): # action led to illegal state
return state
return tuple(nextState)
def farmerTakesItem(self,nextState,itemIndex):
if nextState [0] == nextState[itemIndex]:
if nextState[0] == 'R':
nextState[0] = 'L'
nextState[itemIndex] = 'L'
elif nextState[0] == 'L':
nextState[0] = 'R'
nextState[itemIndex] = 'R'
return nextState
def doesAnyoneDie(self,nextState):
if nextState[1] == nextState[3] and nextState[0] != nextState[1]:
# farmer left the goat with the cabbage
return True
elif nextState[1] == nextState[2] and nextState[0] != nextState[1]:
# farmer left the goat with the wolf
return True
else:
return False
def getNextValues(self, state, action):
nextState = self.nextState(state,action)
return (nextState, nextState)
def done(self, state):
return state == self.goal
sm = FarmerGoatWolfCabbage()
sm.transduce(['takeGoat','takeNone','takeNone'],verbose = True)
return tuple(nextState)
def farmerTakesItem(self, nextState, itemIndex):
if nextState[0] == nextState[itemIndex]:
if nextState[0] == 'R':
nextState[0] = 'L'
nextState[itemIndex] = 'L'
elif nextState[0] == 'L':
nextState[0] = 'R'
nextState[itemIndex] = 'R'
return nextState
def doesAnyoneDie(self, nextState):
if nextState[1] == nextState[3] and nextState[0] != nextState[1]:
return True
elif nextState[1] == nextState[2] and nextState[0] != nextState[1]:
return True
else:
return False
def getNextValues(self, state, action):
nextState = self.nextState(state, action)
return (nextState, nextState)
def done(self, state):
return state == self.goal
sm = FarmerGoatWolfCabbage()
sm.transduce(['takeGoat', 'takeNone', 'takeNone'], verbose=True)
