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FSM.py
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146 lines (120 loc) · 3.69 KB
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# https://zerojudge.tw/ShowProblem?problemid=d618
# abstract FSM simulation
def isSymb(x): return type(x) is str and len(x)>1
def isChar(x): return type(x) is str and len(x)==1
def isSymbKey(x): return type(x) is frozenset
class State:
def __init__(self, name, actFunc=None, isAccept=False):
self.name = name
self.act = actFunc
self.transTable = {}
self.isAccept = isAccept
def __str__(self):
s = 'state:%s,%s\n' % (self.name,self.isAccept)
for k in list(self.transTable.keys()):
s += '(%s)-> %s\n' % (k,self.transTable[k].name)
return s
def p(self):
print('state:%s' % self.name)
return
def addTransform(self, token, target):
if token in self.transTable:
print('this token %s is already in transTable' % token)
# make a warmming, maybe need to raise an error
else:
self.transTable[token] = target
# def isFinalState(self):
# return len(self.transTable) == 0
def isAcceptState(self):
return self.isAccept
def setAcceptable(self,b):
self.isAccept = b
class FSM:
def __init__(self, states, startState):
self.states = states
self.now = startState
def _getNext(self, state, token):
assert len(token)==1, 'token must be a char'
print('get token %s' % token)
now, nextState = state, None
if token in now.transTable:
nextState = now.transTable[token]
else: # use symbol list to check,190220 OK
symbSets = filter(isSymbKey,list(now.transTable.keys()))
for symbSet in symbSets:
if token in symbSet:
nextState = now.transTable[symbSet] # transform to next state
if nextState:
print('from %s to %s' % (now.name, nextState.name))
# if self.now.act: now.act() # state behavior
return nextState
else:
print('this token %s is not in transTable' % token)
# TODO: stop FSM, error end
# stay in 'now'
return now
def step(self, token):
self.now = self._getNext(self.now, token)
return
def execute(self, tape):
print('FSM is start')
print('tape:',tape)
self.tape = tape
# if self.now.act:
# self.now.act()
for token in self.tape:
self.step(token)
if self.now.isAcceptState():
print('Accept')
else:
print('Deny!')
print('FSM is finish')
Symbs={
'd09':{'0','1', '2', '3', '4', '5', '6', '7', '8', '9'},
'd19':{'1', '2', '3', '4', '5', '6', '7', '8', '9'},
}
Stats={
'S1':{'0':'S2', 'd19':'S3','accpet':False},
'S2':{'.':'S5','accpet':True},
'S3':{'d09':'S4','.':'S5','accpet':True},
'S4':{'d09':'S4','.':'S5','accpet':True},
'S5':{'d09':'S6','accpet':False},
'S6':{'0':'S7', 'd19':'S6','accpet':True},
'S7':{'0':'S7', 'd19':'S6','accpet':False}
}
states={} #{'S1':State('S1'), ... }
stateList=[] #[State('S1'), ... ]
# build all state in a dict{}
for x in list(Stats.keys()):
s = State(x)
states[x] = s
stateList.append(s)
# addTransform and setAcceptable
for m in list(Stats.items()): # m [triple], (state name, [dict])
statn,statobj = m[0],m[1]
for token2target in list(statobj.items()): # m[1] [dict], token2target [triple] (token,target)
k,v = token2target[0],token2target[1]
if k is 'accpet':
states[statn].setAcceptable(v)
elif isChar(k):
states[statn].addTransform(k, states[v])
elif isSymb(k):
states[statn].addTransform(frozenset(Symbs[k]), states[v])
else: pass
print('print all states')
for s in stateList:
# print(s)
s.p()
print('--')
fsm = FSM(states,states['S1'])
fsm.execute('0')
fsm.execute('123')
fsm.execute('1.987')
fsm.execute('0.0')
fsm.execute('0.9')
fsm.execute('0.900')
fsm._getNext(stateList[0],'0')
fsm._getNext(stateList[0],'1')
fsm._getNext(stateList[0],'2')
fsm._getNext(stateList[1],'.')
fsm._getNext(stateList[1],'1')