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textnorm_wiki_zh.py
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textnorm_wiki_zh.py
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#!/usr/bin/env python
import string, sys, os
import gzip, re
# import the Chinese constants from Zhon (https://github.com/tsroten/zhon)
import zhon
'''
Symbol definitions
'''
# mapping from 0, 1, ..., 9 to chinese character
digits={u'0':u'\u96f6', u'1':u'\u4e00', u'2':u'\u4e8c', u'3':u'\u4e09', u'4':u'\u56db', u'5':u'\u4e94', u'6':u'\u516d', u'7':u'\u4e03', u'8':u'\u516b', u'9':u'\u4e5d'}
# mapping from 10, 10^2, 10^3, 10^4, 10^8 to chinese characters
tens=[u'', u'\u5341', u'\u767e', u'\u5343']
thousds=[u'', u'\u4e07', u'\u4ebf', u'\u5146']
# Chinese coded English letters and numbers
chnalpupper=[u'\uff21',u'\uff22', u'\uff23', u'\uff24', u'\uff25', u'\uff26', u'\uff27',u'\uff28', u'\uff29', u'\uff2a', u'\uff2b', u'\uff2c', u'\uff2d',u'\uff2e', u'\uff2f', u'\uff30', u'\uff31', u'\uff32', u'\uff33', u'\uff34', u'\uff35', u'\uff36', u'\uff37', u'\uff38', u'\uff39', u'\uff3a']
chnalplower=[u'\uff41',u'\uff42', u'\uff43', u'\uff44', u'\uff45', u'\uff46', u'\uff47',u'\uff48', u'\uff49', u'\uff4a', u'\uff4b', u'\uff4c', u'\uff4d',u'\uff4e', u'\uff4f', u'\uff50', u'\uff51', u'\uff52', u'\uff53', u'\uff54', u'\uff55', u'\uff56', u'\uff57', u'\uff58', u'\uff59', u'\uff5a']
chnnumber=[u'\uff10', u'\uff11', u'\uff12', u'\uff13', u'\uff14', u'\uff15', u'\uff16', u'\uff17', u'\uff18', u'\uff19']
'''
Utility Functions
'''
## regrex patterns
pat_docstart=re.compile(u'^<doc\s+id=\"(.+)\"\s+url=\"(.+)\"\s+title=\"(.+)\">')
pat_comments=re.compile(u'[\(\uff08][^\(\uff08\)\uff09]*[\)\uff09]')
pat_year=re.compile(u'([0-9]{4}\u5e74)') # .{1,4}year
pat_percent=re.compile(u'(([0-9]+)(\.[0-9]+)?[%\u2030])')
pat_decimal=re.compile(u'(([0-9]+)\.([0-9]+)+)')
pat_number=re.compile(u'(([0-9]+)(\.[0-9]+)?)')
pat_zerostr=re.compile(u'([^0-9](0+)[^0-9])')
pat_sentbnd=re.compile(u'[\u3002\uff01\uff1b\uff1f!;?]')
pat_comma=re.compile(u'[,\uff0c]')
pat_nonchn=re.compile(u'^[0-9a-z\s]*$')
pat_space=re.compile(u'\s+')
# for this specific purpose,i.e., character LM, all the English words are mapped to A, which will never appear in the selected data
pat_english=re.compile(u'[a-zA-Z][a-zA-Z\-\.\s]*')
pat_alphanumer=re.compile(u'\d*[a-zA-Z][a-zA-Z\d\-\.\s]*')
pat_dot=re.compile(u'\.')
pat_punc=re.compile(u'[%s\u4e28]' % zhon.unicode.PUNCTUATION)
pat_char=re.compile(u'[%s]' % zhon.unicode.HAN_IDEOGRAPHS)
pat_nonchar=re.compile(u'[^%s]' % zhon.unicode.HAN_IDEOGRAPHS)
pat_special1=re.compile(u'\u2501') # replaced to 'to'
# Chinese coded English and numbers
pat_chnAlphaUpper=re.compile(u'[\uff21-\uff3a]')
pat_chnAlphaLower=re.compile(u'[\uff41-\uff4a]')
pat_chnNumber=re.compile(u'[\uff10-\uff19]')
def replaceComments(sr):
while pat_comments.search(sr):
sr=pat_comments.sub(u'', sr)
return sr
def procYear(sr):
debug=False
ressr=u''
resid=0
for mt in pat_year.finditer(sr):
oldsr=sr[mt.start(1):mt.end(1)]
ressr+=sr[resid:mt.start(1)]
newsr=u''
if debug: print u'####'+oldsr
for ii in range(mt.start(1), mt.end(1)):
if sr[ii] in digits.keys():
newsr+=digits[sr[ii]]
else:
newsr+=sr[ii]
if debug: print u'===='+newsr
if newsr!=oldsr:
ressr+=newsr
else:
ressr+=oldsr
resid=mt.end(1)
if resid<len(sr):
ressr+=sr[resid:]
if debug and resid>0:
print u'####'+sr
print u'===='+ressr
return ressr
def proc4DigNum(sr):
ressr=u''
j=len(sr)-1
for i in range(0,len(sr)):
if sr[j]!=u'0':
ressr=digits[sr[j]]+tens[i]+ressr
else:
if ressr==u'':
ressr=digits[u'0']
else:
if ressr[0]!=digits[u'0']:
ressr=digits[u'0']+ressr
j=j-1
# remove extra 0s at the end
while len(ressr)>1 and ressr[-1]==digits[u'0']:
ressr=ressr[:-1]
return ressr
# different from others, the input is the integer string not the whole sentence
def procInteger(sr):
# too long, convert bit by bit
if len(sr)>16:
return procNumberString(sr)
oldsr=sr
ressr=u''
i=0
curlen=len(oldsr)
while curlen>0:
if curlen>=4:
cursr=proc4DigNum(oldsr[-4:])
oldsr=oldsr[:-4]
else:
cursr=proc4DigNum(oldsr)
oldsr=u''
if cursr!=digits[u'0']:
ressr=cursr+thousds[i]+ressr
else:
if ressr==u'':
ressr=cursr
else:
if ressr[0]!=digits[u'0']:
ressr=digits[u'0']+ressr
i=i+1
curlen=len(oldsr)
# convert begining "one ten" to "ten"
if len(ressr)>=2 and ressr[:2]==u'\u4e00\u5341':
ressr=ressr[1:]
# remove extra 0s at the end
while len(ressr)>1 and ressr[-1]==digits[u'0']:
ressr=ressr[:-1]
# remove extra 0s at the beginning
while len(ressr)>1 and ressr[0]==digits[u'0']:
ressr=ressr[1:]
return ressr
def procNumberString(sr):
newsr=u''
for ii in range(0, len(sr)):
newsr=newsr+digits[sr[ii]]
return newsr
def procPercent(sr):
debug=False
ressr=u''
resid=0
for mt in pat_percent.finditer(sr):
ressr+=sr[resid:mt.start(1)]
oldsr=mt.group(1)
intpart=mt.group(2)
decpart=mt.group(3)
if debug: print u'####'+oldsr
if oldsr[-1]==u'%':
newsr=u'\u767e\u5206\u4e4b'+procInteger(intpart)
elif oldsr[-1]==u'\u2030':
newsr=u'\u5343\u5206\u4e4b'+procInteger(intpart)
else:
print 'Error in converting percentages!'
sys.exit(1)
if decpart != None:
newsr+=u'\u70b9'+procNumberString(decpart[1:])
if debug: print u'===='+newsr
ressr+=newsr
resid=mt.end(1)
if resid<len(sr):
ressr+=sr[resid:]
if debug and resid >0:
print u'####'+sr
print u'===='+ressr
return ressr
def procNumber(sr):
debug=False
ressr=u''
resid=0
for mt in pat_number.finditer(sr):
ressr+=sr[resid:mt.start(1)]
oldsr=mt.group(1)
intpart=mt.group(2)
decpart=mt.group(3)
if debug: print u'####'+oldsr
newsr=procInteger(intpart)
if decpart != None:
newsr+=u'\u70b9'+procNumberString(decpart[1:])
if debug: print u'===='+newsr
ressr+=newsr
resid=mt.end(1)
if resid<len(sr):
ressr+=sr[resid:]
if debug and resid >0:
print u'####'+sr
print u'===='+ressr
return ressr
def procDecimal(sr):
debug=False
ressr=u''
resid=0
for mt in pat_decimal.finditer(sr):
ressr+=sr[resid:mt.start(1)]
oldsr=mt.group(1)
intpart=mt.group(2)
decpart=mt.group(3)
if debug: print u'####'+oldsr
newsr=procInteger(intpart)+u'\u70b9'+procNumberString(decpart)
if debug: print u'===='+newsr
ressr+=newsr
resid=mt.end(1)
if resid<len(sr):
ressr+=sr[resid:]
if debug and resid >0:
print u'####'+sr
print u'===='+ressr
return ressr
# convert single all 0 strings to chinese characters
def procZeroStr(sr):
debug=False
newsr=u''
for mt in pat_zerostr.finditer(sr):
if debug: print u'####'+sr[mt.start(1):mt.end(1)]
newsr=u''
for i in range(mt.start(2),mt.end(2)):
newsr=newsr+digits[u'0']
sr=sr[:mt.start(2)]+newsr+sr[mt.end(2):]
if debug: print u'===='+sr[mt.start(1):mt.end(1)]
if debug and newsr!=u'':
print u'****'+sr
return sr
def splitPar(sr):
debug=False
lst=pat_sentbnd.split(sr)
sents=[]
for itm in lst:
st=itm
stlst=[]
if len(st)>50:
stlst=pat_comma.split(st)
if debug:
print u'###############'
for st in stlst: print st
else:
stlst.append(st)
if debug:
print u'=============='
print st
for st in stlst:
st=pat_punc.sub(u'', st)
st=pat_space.sub(u'', st)
st=pat_special1.sub(u'\u81f3', st)
if pat_nonchar.search(st): # ignore sentences with non Chinese characters
if debug and st != u'': print st
else:
if st!=u'':
sents.append(st)
return sents
# assume english '.' is dot
def procDot(sr):
sr=pat_dot.sub(u'\u70b9', sr)
return sr
# replace chinese coded alphanumeric
def procChnAlphaNumber(sr):
debug=False
flag=False
orisr=sr
for ch in chnalpupper:
if ch in sr:
sr=re.sub(ch, unichr(65+ord(ch)-65313), sr) # 65 - 'A', 65313 - 'A' in Chinese
flag=True
for ch in chnalplower:
if ch in sr:
sr=re.sub(ch, unichr(97+ord(ch)-65345), sr) # a
flag=True
for ch in chnnumber:
if ch in sr:
sr=re.sub(ch, unichr(48+ord(ch)-65296), sr) # 0
flag=True
if u'\ufe6a' in sr:
sr=re.sub(u'\ufe6a', u'%', sr)
if u'\u2103' in sr:
sr=re.sub(u'\u2103', u'\u6444\u6c0f\u5ea6', sr) # celus degree
if u'\u338f' in sr:
sr=re.sub(u'\u338f', u'\u5343\u514b', sr) # kilo gram
if u'\u33a1' in sr:
sr=re.sub(u'\u33a1', u'\u5e73\u65b9\u7c73', sr) # square meters
if u'\u25cb' in sr:
sr=re.sub(u'\u25cb', u'\u96f6', sr) # zero
if debug and flag:
print u'####'+orisr
print u'===='+sr
return sr
'''
Main body
'''
debug=False
fin=open('texts/wiki_00_chs', 'rb')
fout=open('texts/wiki_00_chs_sents', 'w')
while True:
# read and convert UTF-8 encoding to unicode
sr=(fin.readline()).decode('utf-8')
if sr==u'':break
sr=sr.strip()
if debug and sr==u'</doc>': sys.exit(1)
if pat_docstart.match(sr) or sr==u'</doc>':
continue
else:
if sr!=u'':
# remove the English comments in the form of "(abc)"
par=replaceComments(sr)
par=procChnAlphaNumber(par)
par=procYear(par)
par=procPercent(par)
par=procNumber(par)
sents=splitPar(par)
for st in sents:
print >>fout, st.encode('utf-8')
fin.close()
fout.close()