rules.py
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'''
Created on 24 sty 2014
@author: mlenart
'''
from morfeuszbuilder.segrules.rulesNFA import RulesNFAState
class SegmentRule(object):
'''
classdocs
'''
def __init__(self):
'''
Constructor
'''
def addToNFA(self, fsa):
raise NotImplementedError()
def _doAddToNFA(self, startStates, endState):
raise NotImplementedError()
class TagRule(SegmentRule):
def __init__(self, segnum):
self.segnum = segnum
def addToNFA(self, fsa):
endState = RulesNFAState(final=True)
self._doAddToNFA(fsa.initialState, endState)
def _doAddToNFA(self, startState, endState):
startState.addTransition(self.segnum, endState)
def __str__(self):
return u''+self.segnum
class UnaryRule(SegmentRule):
def __init__(self, child):
self.child = child
class ComplexRule(SegmentRule):
def __init__(self, children):
self.children = children
def addToNFA(self, fsa):
endState = RulesNFAState(final=True)
self._doAddToNFA(fsa.initialState, endState)
class ConcatRule(ComplexRule):
def __init__(self, children):
super(ConcatRule, self).__init__(children)
def _doAddToNFA(self, startState, endState):
currStartState = startState
for child in self.children[:-1]:
currEndState = RulesNFAState()
child._doAddToNFA(currStartState, currEndState)
nextStartState = RulesNFAState()
currEndState.addTransition(None, nextStartState)
currStartState = nextStartState
lastChild = self.children[-1]
lastChild._doAddToNFA(currStartState, endState)
class OrRule(ComplexRule):
def __init__(self, children):
super(OrRule, self).__init__(children)
def _doAddToNFA(self, startState, endState):
for child in self.children:
intermStartState = RulesNFAState()
intermEndState = RulesNFAState()
startState.addTransition(None, intermStartState)
child._doAddToNFA(intermStartState, intermEndState)
intermEndState.addTransition(None, endState)
class ZeroOrMoreRule(UnaryRule):
def __init__(self, child):
super(ZeroOrMoreRule, self).__init__(child)
def addToNFA(self, fsa):
raise ValueError()
def _doAddToNFA(self, startState, endState):
intermStartState = RulesNFAState()
intermEndState = RulesNFAState()
startState.addTransition(None, intermStartState)
startState.addTransition(None, endState)
self.child._doAddToNFA(intermStartState, intermEndState)
intermEndState.addTransition(None, endState)
endState.addTransition(None, intermStartState)