serializer.py
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'''
Created on Oct 20, 2013
@author: mlenart
'''
import logging
from state import State
class Serializer(object):
MAGIC_NUMBER = 0x8fc2bc1b
def __init__(self, fsa):
self._fsa = fsa
@property
def fsa(self):
return self._fsa
def getVersion(self):
return 9
def serialize2CppFile(self, fname):
res = []
# self.fsa.calculateOffsets(sizeCounter=lambda state: self.getStateSize(state))
res.append('const unsigned char DEFAULT_FSA[] = {')
for byte in self.fsa2bytearray():
res.append(hex(byte));
res.append(',');
res.append('}')
with open(fname, 'w') as f:
f.write('\n'.join(res))
def serialize2BinaryFile(self, fname):
with open(fname, 'wb') as f:
f.write(self.fsa2bytearray())
def getStateSize(self, state):
raise NotImplementedError('Not implemented')
def fsa2bytearray(self):
res = bytearray()
res.extend(self.serializePrologue(self.serializeTagset(self.fsa.tagset)))
self.fsa.calculateOffsets(sizeCounter=lambda state: self.getStateSize(state))
logging.debug('SERIALIZE')
for state in sorted(self.fsa.dfs(), key=lambda s: s.offset):
res.extend(self.state2bytearray(state))
return res
def serializeTags(self, tagsMap):
res = bytearray()
numOfTags = len(tagsMap)
res.extend(self.htons(numOfTags))
for tag, tagnum in sorted(tagsMap.iteritems(), key=lambda (tag, tagnum): tagnum):
res.extend(self.htons(tagnum))
res.extend(self.fsa.encodeWord(tag))
res.append(0)
return res
def serializeTagset(self, tagset):
res = bytearray()
if tagset:
res.extend(self.serializeTags(tagset.tag2tagnum))
res.extend(self.serializeTags(tagset.name2namenum))
return res
def htons(self, n):
assert n < 65536
assert n >= 0
res = bytearray()
res.append((n & 0x00FF00) >> 8)
res.append(n & 0x0000FF)
return res
def htonl(self, n):
assert n >= 0
res = bytearray()
res.append((n & 0xFF000000) >> 24)
res.append((n & 0x00FF0000) >> 16)
res.append((n & 0x0000FF00) >> 8)
res.append(n & 0x000000FF)
return res
def serializePrologue(self, additionalData=None):
res = bytearray()
# serialize magic number in big-endian order
res.append((Serializer.MAGIC_NUMBER & 0xFF000000) >> 24)
res.append((Serializer.MAGIC_NUMBER & 0x00FF0000) >> 16)
res.append((Serializer.MAGIC_NUMBER & 0x0000FF00) >> 8)
res.append(Serializer.MAGIC_NUMBER & 0x000000FF)
# serialize version number
res.append(self.getVersion())
# serialize implementation code
res.append(self.getImplementationCode())
# serialize additional data size in 2-byte big-endian
additionalDataSize = len(additionalData) if additionalData else 0
res.extend(self.htonl(additionalDataSize))
# add additional data itself
if additionalDataSize:
assert type(additionalData) == bytearray
res.extend(additionalData)
return res
def state2bytearray(self, state):
res = bytearray()
res.extend(self.stateData2bytearray(state))
res.extend(self.transitionsData2bytearray(state))
return res
def getSortedTransitions(self, state):
defaultKey = lambda (label, nextState): (-state.label2Freq.get(label, 0), -self.fsa.label2Freq.get(label, 0))
return list(sorted(
state.transitionsMap.iteritems(),
key=defaultKey))
def stateData2bytearray(self, state):
raise NotImplementedError('Not implemented')
def transitionsData2bytearray(self, state):
raise NotImplementedError('Not implemented')
def getImplementationCode(self):
raise NotImplementedError('Not implemented')
class SimpleSerializer(Serializer):
def __init__(self, fsa):
super(SimpleSerializer, self).__init__(fsa)
self.ACCEPTING_FLAG = 128
def getImplementationCode(self):
return 0
def getStateSize(self, state):
return 1 + 4 * len(state.transitionsMap.keys()) + self.getDataSize(state)
def getDataSize(self, state):
assert type(state.encodedData) == bytearray or not state.isAccepting()
return len(state.encodedData) if state.isAccepting() else 0
def stateData2bytearray(self, state):
res = bytearray()
firstByte = 0
if state.isAccepting():
firstByte |= self.ACCEPTING_FLAG
firstByte |= state.transitionsNum
assert firstByte < 256 and firstByte > 0
res.append(firstByte)
if state.isAccepting():
res.extend(state.encodedData)
return res
def transitionsData2bytearray(self, state):
res = bytearray()
# logging.debug('next')
for label, nextState in self.getSortedTransitions(state):
res.append(label)
offset = nextState.offset
res.append((offset & 0xFF0000) >> 16)
res.append((offset & 0x00FF00) >> 8)
res.append(offset & 0x0000FF)
return res
class VLengthSerializer1(Serializer):
def __init__(self, fsa, useArrays=False):
super(VLengthSerializer1, self).__init__(fsa)
self.statesTable = list(reversed(list(fsa.dfs())))
self.state2Index = dict([(state, idx) for (idx, state) in enumerate(self.statesTable)])
self._chooseArrayStates()
self.useArrays = useArrays
self.ACCEPTING_FLAG = 0b10000000
self.ARRAY_FLAG = 0b01000000
def getImplementationCode(self):
return 1
def serializePrologue(self, additionalData):
res = super(VLengthSerializer1, self).serializePrologue(additionalData)
# labels sorted by popularity
sortedLabels = [label for (label, freq) in sorted(self.fsa.label2Freq.iteritems(), key=lambda (label, freq): (-freq, label))]
# popular labels table
self.label2ShortLabel = dict([(label, sortedLabels.index(label) + 1) for label in sortedLabels[:63]])
logging.debug(dict([(chr(label), shortLabel) for label, shortLabel in self.label2ShortLabel.items()]))
# write remaining short labels (zeros)
for label in range(256):
res.append(self.label2ShortLabel.get(label, 0))
# write a magic char before initial state
res.append(ord('^'))
return res
def getStateSize(self, state):
return len(self.state2bytearray(state))
def getDataSize(self, state):
assert type(state.encodedData) == bytearray or not state.isAccepting()
return len(state.encodedData) if state.isAccepting() else 0
def stateShouldBeAnArray(self, state):
return self.useArrays and state.serializeAsArray
def stateData2bytearray(self, state):
assert state.transitionsNum < 64
res = bytearray()
firstByte = 0
if state.isAccepting():
firstByte |= self.ACCEPTING_FLAG
if self.stateShouldBeAnArray(state):
firstByte |= self.ARRAY_FLAG
firstByte |= state.transitionsNum
assert firstByte < 256 and firstByte > 0
res.append(firstByte)
if state.isAccepting():
res.extend(state.encodedData)
return res
def _transitions2ListBytes(self, state, originalState=None):
res = bytearray()
transitions = self.getSortedTransitions(state)
thisIdx = self.state2Index[originalState if originalState is not None else state]
logging.debug('state '+str(state.offset))
if len(transitions) == 0:
assert state.isAccepting()
return bytearray()
else:
stateAfterThis = self.statesTable[thisIdx + 1]
for reversedN, (label, nextState) in enumerate(reversed(transitions)):
transitionBytes = bytearray()
assert nextState.reverseOffset is not None
assert stateAfterThis.reverseOffset is not None
logging.debug('next state reverse: '+str(nextState.reverseOffset))
logging.debug('after state reverse: '+str(stateAfterThis.reverseOffset))
# firstByte = label
n = len(transitions) - reversedN
hasShortLabel = label in self.label2ShortLabel
firstByte = self.label2ShortLabel[label] if hasShortLabel else 0
firstByte <<= 2
last = len(transitions) == n
isNext = last and stateAfterThis == nextState
offsetSize = 0
# offset = 0
offset = (stateAfterThis.reverseOffset - nextState.reverseOffset) + len(res)
assert offset > 0 or isNext
if offset > 0:
offsetSize += 1
if offset >= 256:
offsetSize += 1
if offset >= 256 * 256:
offsetSize += 1
assert offset < 256 * 256 * 256 #TODO - przerobic na jakis porzadny wyjatek
assert offsetSize <= 3
assert offsetSize > 0 or isNext
firstByte |= offsetSize
transitionBytes.append(firstByte)
if not hasShortLabel:
transitionBytes.append(label)
# serialize offset in big-endian order
if offsetSize == 3:
transitionBytes.append((offset & 0xFF0000) >> 16)
if offsetSize >= 2:
transitionBytes.append((offset & 0x00FF00) >> 8)
if offsetSize >= 1:
transitionBytes.append(offset & 0x0000FF)
for b in reversed(transitionBytes):
res.insert(0, b)
logging.debug('inserted transition at beginning '+chr(label)+' -> '+str(offset))
return res
def _trimState(self, state):
newState = State()
newState.encodedData = state.encodedData
newState.reverseOffset = state.reverseOffset
newState.offset = state.offset
newState.transitionsMap = dict([(label, nextState) for (label, nextState) in state.transitionsMap.iteritems()])
# newState.transitionsMap = dict([(label, nextState) for (label, nextState) in state.transitionsMap.iteritems() if not label in self.label2ShortLabel or not self.label2ShortLabel[label] in range(1,64)])
newState.serializeAsArray = False
return newState
def _transitions2ArrayBytes(self, state):
res = bytearray()
array = [0] * 64
for label, nextState in state.transitionsMap.iteritems():
if label in self.label2ShortLabel:
shortLabel = self.label2ShortLabel[label]
array[shortLabel] = nextState.offset
logging.debug(array)
for offset in map(lambda x: x if x else 0, array):
res.append(0)
res.append((offset & 0xFF0000) >> 16)
res.append((offset & 0x00FF00) >> 8)
res.append(offset & 0x0000FF)
res.extend(self._stateData2bytearray(self._trimState(state)))
res.extend(self._transitions2ListBytes(self._trimState(state), originalState=state))
return res
def transitionsData2bytearray(self, state):
if self.stateShouldBeAnArray(state):
return self._transitions2ArrayBytes(state)
else:
return self._transitions2ListBytes(state)
def _chooseArrayStates(self):
for state1 in self.fsa.initialState.transitionsMap.values():
for state2 in state1.transitionsMap.values():
# for state3 in state2.transitionsMap.values():
# state3.serializeAsArray = True
state2.serializeAsArray = True
state1.serializeAsArray = True
self.fsa.initialState.serializeAsArray = True
class VLengthSerializer2(Serializer):
def __init__(self, fsa, useArrays=False):
super(VLengthSerializer2, self).__init__(fsa)
self.statesTable = list(reversed(list(fsa.dfs())))
self.state2Index = dict([(state, idx) for (idx, state) in enumerate(self.statesTable)])
self.HAS_REMAINING_FLAG = 128
self.ACCEPTING_FLAG = 64
self.LAST_FLAG = 32
def getImplementationCode(self):
return 2
def getStateSize(self, state):
return len(self.state2bytearray(state))
# def getDataSize(self, state):
# assert type(state.encodedData) == bytearray or not state.isAccepting()
# return len(state.encodedData) if state.isAccepting() else 0
def stateData2bytearray(self, state):
res = bytearray()
if state.isAccepting():
res.extend(state.encodedData)
return res
def _first5Bits(self, number):
n = number
while n >= 32:
n >>= 7
return n
def _getOffsetBytes(self, offset):
res = bytearray()
remaining = offset
lastByte = True
while remaining >= 32:
nextByte = remaining & 0b01111111
remaining >>= 7
if not lastByte:
nextByte |= self.HAS_REMAINING_FLAG
else:
lastByte = False
res.insert(0, nextByte)
logging.debug(remaining)
return res
def _transitions2ListBytes(self, state):
res = bytearray()
thisIdx = self.state2Index[state]
transitions = self.getSortedTransitions(state)
if len(transitions) == 0:
assert state.isAccepting()
res.append(self.LAST_FLAG)
return res
else:
stateAfterThis = self.statesTable[thisIdx + 1]
for reversedN, (label, nextState) in enumerate(reversed(transitions)):
transitionBytes = bytearray()
assert nextState.reverseOffset is not None
assert stateAfterThis.reverseOffset is not None
logging.debug('next state reverse: '+str(nextState.reverseOffset))
logging.debug('after state reverse: '+str(stateAfterThis.reverseOffset))
n = len(transitions) - reversedN
firstByte = label
last = len(transitions) == n
secondByte = 0
if last: secondByte |= self.LAST_FLAG
if nextState.isAccepting(): secondByte |= self.ACCEPTING_FLAG
offset = (stateAfterThis.reverseOffset - nextState.reverseOffset) + len(res)
if offset >= 32:
secondByte |= self.HAS_REMAINING_FLAG
secondByte |= self._first5Bits(offset)
else:
secondByte |= offset
transitionBytes.append(firstByte)
transitionBytes.append(secondByte)
transitionBytes.extend(self._getOffsetBytes(offset))
for b in reversed(transitionBytes):
res.insert(0, b)
logging.debug('inserted transition at beginning '+chr(label)+' -> '+str(offset))
return res
#
def transitionsData2bytearray(self, state):
return self._transitions2ListBytes(state)