state.py
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'''
Created on Oct 8, 2013
@author: mlenart
'''
class State(object):
'''
A state in an automaton
'''
statesCounter = 0
def __init__(self, additionalData=None):
self.transitionsMap = {}
self.freq = 0
self.encodedData = None
self.reverseOffset = None
self.offset = None
self.label2Freq = {}
self.serializeAsArray = False
self.additionalData = additionalData
self.idx = State.statesCounter
State.statesCounter += 1
@property
def transitionsNum(self):
return len(self.transitionsMap)
def setTransition(self, byte, nextState):
self.transitionsMap[byte] = nextState
def hasNext(self, byte):
return byte in self.transitionsMap
def getNext(self, byte, addFreq=False):
if addFreq:
self.freq += 1
self.label2Freq[byte] = self.label2Freq.get(byte, 0) + 1
return self.transitionsMap.get(byte, None)
def getRegisterKey(self):
return ( frozenset(self.transitionsMap.iteritems()), tuple(self.encodedData) if self.encodedData else None )
def isAccepting(self):
return self.encodedData is not None
def tryToRecognize(self, word, addFreq=False):
if word:
nextState = self.getNext(word[0], addFreq)
if nextState:
return nextState.tryToRecognize(word[1:], addFreq)
else:
return False
else:
return self.encodedData
def dfs(self, alreadyVisited, sortKey=lambda (_, state): -state.freq):
if not self in alreadyVisited:
alreadyVisited.add(self)
for _, state in sorted(self.transitionsMap.iteritems(), key=sortKey):
for state1 in state.dfs(alreadyVisited):
yield state1
yield self
def debug(self):
print '----------------'
print 'STATE:', self.idx
for label, s in self.transitionsMap.iteritems():
print label, '-->', s.idx