正向最大匹配

# -*- coding:utf-8 -*-

CODEC='utf-8'

def u(s, encoding):

'converted other encoding to unicode encoding'

if isinstance(s, unicode):

return s

else:

return unicode(s, encoding)

def fwd_mm_seg(wordDict, maxLen, str):

'forward max match segment'

wordList = []

segStr = str

segStrLen = len(segStr)

for word in wordDict:

print 'word: ', word

print "\n"

while segStrLen > 0:

if segStrLen > maxLen:

wordLen = maxLen

else:

wordLen = segStrLen

subStr = segStr[0:wordLen]

print "subStr: ", subStr

while wordLen > 1:

if subStr in wordDict:

print "subStr1: %r" % subStr

break

else:

print "subStr2: %r" % subStr

wordLen = wordLen - 1

subStr = subStr[0:wordLen]

# print "subStr3: ", subStr

wordList.append(subStr)

segStr = segStr[wordLen:]

segStrLen = segStrLen - wordLen

for wordstr in wordList:

print "wordstr: ", wordstr

return wordList

def main():

fp_dict = open('words.dic')

wordDict = {}

for eachWord in fp_dict:

wordDict[u(eachWord.strip(), 'utf-8')] = 1

segStr = u'你好世界hello world'

print segStr

wordList = fwd_mm_seg(wordDict, 10, segStr)

print "==".join(wordList)

if __name__ == '__main__':

main()

逆向最大匹配

# -*- coding:utf-8 -*-

def u(s, encoding):

'converted other encoding to unicode encoding'

if isinstance(s, unicode):

return s

else:

return unicode(s, encoding)

CODEC='utf-8'

def bwd_mm_seg(wordDict, maxLen, str):

'forward max match segment'

wordList = []

segStr = str

segStrLen = len(segStr)

for word in wordDict:

print 'word: ', word

print "\n"

while segStrLen > 0:

if segStrLen > maxLen:

wordLen = maxLen

else:

wordLen = segStrLen

subStr = segStr[-wordLen:None]

print "subStr: ", subStr

while wordLen > 1:

if subStr in wordDict:

print "subStr1: %r" % subStr

break

else:

print "subStr2: %r" % subStr

wordLen = wordLen - 1

subStr = subStr[-wordLen:None]

# print "subStr3: ", subStr

wordList.append(subStr)

segStr = segStr[0: -wordLen]

segStrLen = segStrLen - wordLen

wordList.reverse()

for wordstr in wordList:

print "wordstr: ", wordstr

return wordList

def main():

fp_dict = open('words.dic')

wordDict = {}

for eachWord in fp_dict:

wordDict[u(eachWord.strip(), 'utf-8')] = 1

segStr = ur'你好世界hello world'

print segStr

wordList = bwd_mm_seg(wordDict, 10, segStr)

print "==".join(wordList)

if __name__ == '__main__':

main()

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