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, linenum):
self.weak = False
self.linenum = linenum
def setWeak(self, weak):
self.weak = weak
return self
def addToNFA(self, fsa):
raise NotImplementedError()
def allowsEmptySequence(self):
raise NotImplementedError()
def _doAddToNFA(self, startStates, endState):
raise NotImplementedError()
class TagRule(SegmentRule):
def __init__(self, segnum, shiftOrth, segtype, linenum):
self.segnum = segnum
self.segtype = segtype
self.shiftOrth = shiftOrth
self.linenum = linenum
def addToNFA(self, fsa):
endState = RulesNFAState(self, final=True, weak=self.weak)
self._doAddToNFA(fsa.initialState, endState)
def _doAddToNFA(self, startState, endState):
startState.addTransition((self.segnum, self.shiftOrth), endState)
def allowsEmptySequence(self):
return False
def __str__(self):
return u'%s(%d)' % (self.segtype, self.segnum)
class UnaryRule(SegmentRule):
def __init__(self, child, linenum):
self.child = child
self.linenum = linenum
class ComplexRule(SegmentRule):
def __init__(self, children, linenum):
self.children = children
self.linenum = linenum
def addToNFA(self, fsa):
endState = RulesNFAState(self, final=True, weak=self.weak)
self._doAddToNFA(fsa.initialState, endState)
class ConcatRule(ComplexRule):
def __init__(self, children, linenum):
super(ConcatRule, self).__init__(children, linenum)
def _doAddToNFA(self, startState, endState):
currStartState = startState
for child in self.children[:-1]:
currEndState = RulesNFAState(self)
child._doAddToNFA(currStartState, currEndState)
nextStartState = RulesNFAState(self)
currEndState.addTransition(None, nextStartState)
currStartState = nextStartState
lastChild = self.children[-1]
lastChild._doAddToNFA(currStartState, endState)
def allowsEmptySequence(self):
return all(map(lambda rule: rule.allowsEmptySequence(), self.children))
def __str__(self):
return u' '.join(map(lambda c: str(c), self.children))
class OrRule(ComplexRule):
def __init__(self, children, linenum):
super(OrRule, self).__init__(children, linenum)
def _doAddToNFA(self, startState, endState):
for child in self.children:
intermStartState = RulesNFAState(self)
intermEndState = RulesNFAState(self)
startState.addTransition(None, intermStartState)
child._doAddToNFA(intermStartState, intermEndState)
intermEndState.addTransition(None, endState)
def allowsEmptySequence(self):
return any(map(lambda rule: rule.allowsEmptySequence(), self.children))
def __str__(self):
return u'|'.join(map(lambda c: str(c), self.children))
class ZeroOrMoreRule(UnaryRule):
def __init__(self, child, linenum):
super(ZeroOrMoreRule, self).__init__(child, linenum)
assert isinstance(child, SegmentRule)
def addToNFA(self, fsa):
raise ValueError()
def _doAddToNFA(self, startState, endState):
intermStartState = RulesNFAState(self)
intermEndState = RulesNFAState(self)
startState.addTransition(None, intermStartState)
startState.addTransition(None, endState)
self.child._doAddToNFA(intermStartState, intermEndState)
intermEndState.addTransition(None, endState)
intermEndState.addTransition(None, intermStartState)
def allowsEmptySequence(self):
return True
def __str__(self):
return u'(' + str(self.child) + ')*'
class OptionalRule(UnaryRule):
def __init__(self, child, linenum):
super(OptionalRule, self).__init__(child, linenum)
assert isinstance(child, SegmentRule)
def addToNFA(self, fsa):
raise ValueError()
def _doAddToNFA(self, startState, endState):
intermStartState = RulesNFAState(self)
intermEndState = RulesNFAState(self)
startState.addTransition(None, intermStartState)
startState.addTransition(None, endState)
self.child._doAddToNFA(intermStartState, intermEndState)
intermEndState.addTransition(None, endState)
def allowsEmptySequence(self):
return True
def __str__(self):
return u'(' + str(self.child) + ')?'