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wikiIndexer.py
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wikiIndexer.py
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import xml.sax
import re
from Stemmer import Stemmer
from collections import defaultdict
import timeit
import math
#from merge import merge_files
import sys
words= defaultdict(dict)
stopwords= defaultdict(int)
title_dict=defaultdict(str)
fp_title_offsetfile=None
file_no=0
file_no_title=0
no_of_docs=0
with open ('stop_words.txt','r') as f:
pi=0
for i in f:
i=i.strip(' ').strip("\n")
stopwords[i]=1
pi+=1
def removeStopWords(dataList):
temp=[key for key in dataList if stopwords[key]!=1]
return temp
def tokenise(data):
tok=[]
tok=re.findall(r'[a-z]+',data)
return tok
def stem(datalist): #Stemming
stemmer=Stemmer("english")
tmp=[]
for x in datalist:
y=stemmer.stemWord(x)
tmp.append(y)
return tmp
def makeDict(datalist):
datalist = removeStopWords(datalist)
p=[]
temp=defaultdict(int)
datalist= stem(datalist)
for x in datalist:
temp[x]=temp[x]+1
return temp
def findExternalLinks(data):
line = data.split("==external links==")
links=[]
if len(line)>=2:
lines=[]
lines=line[1].split("\n")
length=len(lines)
for i in range(length):
if '* [' in lines[i] or '*[' in lines[i]:
temp=[]
temp=lines[i].split(' ')
word=""
word=[key for key in temp if 'http' not in temp]
word=' '.join(word).encode('utf-8')
links.append(word)
links=tokenise(b' '.join(links).decode())
#print(links)
tmp=makeDict(links)
return tmp
def writeFile(fname):
global words
with open("tmp/"+fname,'w') as f:
li=sorted(words.keys())
#print(words.keys())
for w in (li):
s=""
s=s+w+"/"
tmp=words[w]
for j in (sorted(tmp.keys())):
s=s+str(j)+"-"
tot_words_in_doc=0
for k in range(0,5):
tot_words_in_doc+=words[w][j][k]
#s=s+"tf"+str(1+round(math.log10(tot_words_in_doc),4))+":"
s=s+"f"+str(tot_words_in_doc)+":"
if words[w][j][0]>0:
s=s+"t"+str(words[w][j][0])+":"
if words[w][j][1]>0:
s=s+"b"+str(words[w][j][1])+":"
if words[w][j][2]>0:
s=s+"i"+str(words[w][j][2])+":"
if words[w][j][3]>0:
s=s+"c"+str(words[w][j][3])+":"
if words[w][j][4]>0:
s=s+"e"+str(words[w][j][4])+":"
s=s[:-1]
s=s+";"
s=s[:-1]
f.write(s)
f.write("\n")
def writeTitle(fname):
global title_dict
global file_no_title
global fp_title_offsetfile
with open("tmp/"+fname,'w') as f:
li=sorted(title_dict.keys())
fp_title_offsetfile.write(str(li[0]))
fp_title_offsetfile.write(" "+str(file_no_title)+"\n")
for doc_id in (li):
f.write(str(doc_id))
f.write("-"+str(title_dict[doc_id])+"\n")
def processTitle(data):
data=data.lower()
data_tok=re.findall(r'\d+|[\w]+',data)
temp=makeDict(data_tok)
return temp
def process_Text(data):
data=data.lower()
ext=findExternalLinks(data)
body_text=[]
info_box=[]
category=[]
data = data.replace('_',' ').replace(',','')
l=data.split('\n')
i=0
body_fin=1
co=0
lengt=len(l)
while i < lengt:
if '{{infobox' in l[i]:
p=[]
temp=l[i].split('{{infobox')
co=co+temp[1].count('{{')-temp[1].count('}}')
co=co+1
info_box.append(temp[1])
body_text.append(temp[0])
i=i+1
while co>=1 and i<len(l):
co=co+l[i].count('{{')-l[i].count('}}')
info_box.append(l[i])
i=i+1
elif body_fin==1:
body_text.append(l[i])
if '[[category' in l[i] or '==external links==' in l[i]:
body_fin=0
else:
if '[[category' in l[i]:
temp=l[i].replace('[[category:','')
category.append(temp)
i=i+1
cat=tokenise(' '.join(category))
body=tokenise(' '.join(body_text))
info=tokenise(' '.join(info_box))
cat_n=makeDict(cat)
body_n=makeDict(body)
info_n=makeDict(info)
return cat_n,body_n,info_n,ext
class WikiHandler( xml.sax.ContentHandler):
def __init__(self):
self.page=0
self.id=0
self.text=0
self.title=0
self.count=0
self.count_title=0
self.bufid=""
self.title_words=defaultdict(int)
self.cat_words=defaultdict(int)
self.body_words=defaultdict(int)
self.infobox_words=defaultdict(int)
self.extLinks_words=defaultdict(int)
def makeIndex(self,buffid,title,cat,body,info,ext):
global file_no
global file_no_title
global title_dict
c=float(len(cat))
tmp=defaultdict(int)
t=float(len(title))
allWordsList=set(title.keys())
for i in ext.keys():
allWordsList.add(i)
li_co=0
for i in cat.keys():
allWordsList.add(i)
li_co+=1
global words
for i in body.keys():
allWordsList.add(i)
for i in info.keys():
allWordsList.add(i)
b=float(len(body))
li_co+=1
inf=float(len(info))
li_co+=1
e=float(len(ext))
px=0
for i in allWordsList:
l=[]
px+=1
l.append(title[i])
l.append(body[i])
l.append(info[i])
l.append(cat[i])
l.append(ext[i])
words[i][int(self.bufid)]=l
if self.count > 20000 :
writeFile("temp"+str(file_no))
self.count=0
file_no=file_no+1
words=defaultdict(dict)
if self.count_title > 20000:
writeTitle("title"+str(file_no_title))
title_dict=defaultdict(str)
file_no_title+=1
self.count_title=0
def startElement(self,tag,attr):
global no_of_docs
if(tag=="id" and self.page==0):
self.page=1
self.id=1
self.bufid=""
no_of_docs+=1
elif(tag=="title"):
self.title=1
self.buftitle=""
elif(tag=="text"):
self.text=1
self.buftext=""
def characters(self,data):
if (self.id==1 and self.page==1):
self.bufid += data
title_dict[int(self.bufid)]=self.buftitle
#s=self.bufid+" "+self.buftitle+"\n"
#fp_titlefile.write(s)
elif(self.title==1 ):
self.buftitle += data
elif(self.text==1):
self.buftext += data
def endElement(self,tag):
#global fp_titlefile
if(tag=="page"):
self.page=0
self.count+=1
self.count_title+=1
if(tag=="title"):
self.title=0
self.title_words=processTitle(self.buftitle)
if(tag=="id"):
self.id=0
if(tag=="text"):
self.text=0
self.cat_words,self.body_words,self.infobox_words,self.extLinks_words=process_Text(self.buftext)
tmp=[]
WikiHandler.makeIndex(self,self.bufid,self.title_words,self.cat_words,self.body_words,self.infobox_words,self.extLinks_words)
def main():
global fp_title_offsetfile
fp_title_offsetfile=open("tmp/title_offset","w")
par=xml.sax.make_parser()
Handler = WikiHandler()
par.setFeature(xml.sax.handler.feature_namespaces,0)
par.setContentHandler( Handler )
par.parse(sys.argv[1])
print("no_of_docs"+str(no_of_docs))
fi= open("tmp/doc_count.txt","w+")
fi.write(str(no_of_docs))
fi.close()
writeFile("temp"+str(file_no))
writeTitle("title"+str(file_no_title))
fp_title_offsetfile.close()
#merge_files("tmp/temp",file_no+1)
if __name__ == "__main__": #main
start = timeit.default_timer()
main()
stop = timeit.default_timer()
print (stop - start)