rules.py
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'''
Created on 24 sty 2014
@author: mlenart
'''
import copy
from morfeuszbuilder.segrules.rulesNFA import RulesNFAState
class SegmentRule(object):
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()
def transformToGeneratorVersion(self):
raise NotImplementedError()
def isSinkRule(self):
return False
def isShiftOrthRule(self):
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):
res = self.segtype
res += '(' + str(self.segnum) + ')'
if self.shiftOrth:
res += '>'
return res
# return u'%s(%d)' % (self.segtype, self.segnum)
def transformToGeneratorVersion(self):
return copy.deepcopy(self)
def isShiftOrthRule(self):
return self.shiftOrth
class UnaryRule(SegmentRule):
def __init__(self, child, linenum):
super(UnaryRule, self).__init__(linenum)
self.child = child
assert not child.isSinkRule()
def isShiftOrthRule(self):
return self.child.isShiftOrthRule()
class ComplexRule(SegmentRule):
def __init__(self, children, linenum):
super(ComplexRule, self).__init__(linenum)
self.children = children
assert not any(map(lambda c: c.isSinkRule(), children))
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))
def isShiftOrthRule(self):
return all(map(lambda c: c.isShiftOrthRule(), self.children))
def transformToGeneratorVersion(self):
newChildren = [child.transformToGeneratorVersion() for child in self.children if not child.allowsEmptySequence() or child.isShiftOrthRule()]
if newChildren == []:
return SinkRule()
hasNonOptionalNonShiftingRule = False
for child in newChildren:
# print 'child=', child
if child.isSinkRule() or hasNonOptionalNonShiftingRule:
return SinkRule()
elif not child.isShiftOrthRule():
hasNonOptionalNonShiftingRule = True
# print 'got nonshifting'
return ConcatRule(newChildren, self.linenum)
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))
def isShiftOrthRule(self):
return all(map(lambda c: c.isShiftOrthRule(), self.children))
def transformToGeneratorVersion(self):
newChildren = [child.transformToGeneratorVersion() for child in self.children if not child.allowsEmptySequence() or child.isShiftOrthRule()]
newChildren = filter(lambda c: not c.isSinkRule(), newChildren)
if newChildren == []:
return SinkRule()
else:
return OrRule(newChildren, self.linenum)
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 transformToGeneratorVersion(self):
if self.isShiftOrthRule():
return copy.deepcopy(self)
else:
return SinkRule()
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 transformToGeneratorVersion(self):
if self.isShiftOrthRule():
return copy.deepcopy(self)
else:
return self.child.transformToGeneratorVersion()
def __str__(self):
return u'(' + str(self.child) + ')?'
class SinkRule(SegmentRule):
def __init__(self):
super(SinkRule, self).__init__(None)
def addToNFA(self, fsa):
return
def allowsEmptySequence(self):
return False
def _doAddToNFA(self, startStates, endState):
return
def transformToGeneratorVersion(self):
return self
def isSinkRule(self):
return True
def __str__(self):
return '<<REMOVED>>'