def __init__(self, loader):
self.BOS_FEATURE = -1
self.EOS_FEATURE = -2
self.sysDictionary = Dictionary(loader, 'sys')
self.unkDictionary = Dictionary(loader, 'unk')
if self.sysDictionary.getCharSet() != 'euc-jp':
raise RuntimeError('Unknown dictionary encoding: ' + self.sysDictionary.getCharSet())
self.charProperties = CharProperty(loader, self.sysDictionary.getCharSet())
self.spaceCharInfo = self.charProperties.getCharInfo(' ')
self.unkCategoryTokens = self.loadUnknownCategoryTokens()
class Tokenizer:
def __init__(self, loader):
self.BOS_FEATURE = -1
self.EOS_FEATURE = -2
self.sysDictionary = Dictionary(loader, 'sys')
self.unkDictionary = Dictionary(loader, 'unk')
if self.sysDictionary.getCharSet() != 'euc-jp':
raise RuntimeError('Unknown dictionary encoding: ' + self.sysDictionary.getCharSet())
self.charProperties = CharProperty(loader, self.sysDictionary.getCharSet())
self.spaceCharInfo = self.charProperties.getCharInfo(' ')
self.unkCategoryTokens = self.loadUnknownCategoryTokens()
def loadUnknownCategoryTokens(self):
unkCategoryTokens = []
for cat in self.charProperties.getCategories():
tokens = self.unkDictionary.exactMatchSearch(cat)
unkCategoryTokens.append(tokens)
return unkCategoryTokens
def getFeature(self, featureId, isKnown):
if isKnown:
return self.sysDictionary.getFeature(featureId)
else:
return '' #return self.unkDictionary.getFeature(featureId)
def seekToOtherCharType(self, text, charInfo):
for i in range(len(text)):
ch = self.charProperties.getCharInfo(text[i])
if not charInfo.isKindOf(ch):
return i, ch
return len(text), charInfo
def needSeizeMoreChars(self, text, startCharInfo):
if startCharInfo.invoke:
endToLookupPos, endToLookup = self.seekToOtherCharType(text, startCharInfo)
return endToLookupPos != 0
else:
return False
def findNonSpacePosition(self, text):
startToLookup, startCharInfo = self.seekToOtherCharType(text, self.spaceCharInfo)
return startToLookup
def lookUp(self, text, posInSentence):
# skip leading spaces
startToLookup, startCharInfo = self.seekToOtherCharType(text, self.spaceCharInfo)
text = text[startToLookup:]
posInSentence += startToLookup
tokens = self.sysDictionary.commonPrefixSearch(text)
result = []
if tokens and len(tokens):
result = [Node(token, posInSentence) for token in tokens]
if len(result) and not startCharInfo.needAddUnknownChar():
return result
if len(text) == 1:
if len(result) == 0:
result += self.getUnknownTokens(startCharInfo, text[0], posInSentence)
return result
maxGroup, maxGroupPos = self.getMaxGroup(text, startCharInfo, posInSentence)
result += maxGroup
result += self.getExtraGroup(text, startCharInfo, maxGroupPos, posInSentence)
if len(result) == 0:
result += self.getUnknownTokens(startCharInfo, text[0], posInSentence)
return result
def getMaxGroup(self, text, startCharInfo, posInSentence):
"""
managed by CharInfo.group
"""
endToLookup = 0
result = []
if startCharInfo.canBeGrouped():
endToLookupPos, endToLookup = self.seekToOtherCharType(text, startCharInfo)
if endToLookupPos > 1:
# extend the context and convert the found tokens to unknown ones
result += self.getUnknownTokens(startCharInfo, text[0 : endToLookupPos], posInSentence)
return result, endToLookup
def getExtraGroup(self, text, startCharInfo, maxGroupPos, posInSentence):
"""
managed by cahrInfo.length
"""
result = []
for i in range(1, startCharInfo.getExtraGroupNumber() + 1):
#unknown token
if i == maxGroupPos:
continue
if i > len(text):
break
charCategory = self.charProperties.getCharInfo(text[i-1])
if startCharInfo.isKindOf(charCategory):
result += self.getUnknownTokens(startCharInfo, text[0 : i], posInSentence)
else:
break
return result
def getUnknownTokens(self, startCharInfo, tokenText, posInSentence):
assert(startCharInfo.defaultType < len(self.unkCategoryTokens))
tokens = self.unkCategoryTokens[startCharInfo.defaultType]
nodes = [Node(copy.copy(token), posInSentence) for token in tokens]
for node in nodes:
node.token.text = tokenText
node.isKnown = False
return nodes
def getBOSNode(self, bosPos):
t = Token('', 0, 0, 0, 0, self.BOS_FEATURE, 0)
return Node(t, bosPos)
def getEOSNode(self, eosPos):
t = Token('', 0, 0, 0, 0, self.EOS_FEATURE, 0)
return Node(t, eosPos)
def isEOSNode(self, node):
return node.token.featureId == self.EOS_FEATURE
def isBOSNode(self, node):
return node.token.featureId == self.BOS_FEATURE