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arwiki_parser.py
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arwiki_parser.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# arwiki_parser - Extract plain text from Arabic Wikipedia dumps.
# Copyright (C) 2014 Ossama W. Obeid
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import sys
import os
import os.path
import re
from lxml import etree
from bs4 import BeautifulSoup, Comment
from mwlib.uparser import parseString
from mwlib.dummydb import DummyDB
from mwlib.xhtmlwriter import MWXHTMLWriter, preprocess
from mwlib.xmltreecleaner import removeLangLinks
MWXHTMLWriter.ignoreUnknownNodes = False
_MIN_SIZE = 1024
bad_link_re = re.compile(
u'^(تصنيف\:)|(تصغير)|((left\||right\|)?thumb\|(left\||right\|)?)')
diacritics_re = re.compile(u'[\u064b-\u065e]')
def noop(x, y):
return None
def strip_diacritics(text):
return diacritics_re.sub(text)
def extract_text(xhtml):
if xhtml is None or len(xhtml) < _MIN_SIZE:
return None
soup = BeautifulSoup(xhtml)
#Check if title refers to a mete-wiki page
title_tag = soup.find('h1')
if ':' in title_tag.text:
return None
else:
title_tag.replace_with(title_tag.text + '\n')
content = soup.find('div', class_="mwx.article")
#Clean links
links = content.find_all(['a'])
if links is not None:
for link in links:
match = bad_link_re.search(link.text)
if match is None:
link.unwrap()
else:
link.decompose()
#Remove thumbnails
thumbs = content.find_all('div', class_='thumb')
if thumbs is not None:
for thumb in thumbs:
thumb.decompose()
#Remove publish date
pdates = content.find_all(class_=['publish', 'published'])
if thumbs is not None:
for pdate in pdates:
pdate.decompose()
#Remove comments
comments = content.find_all(text=lambda text: isinstance(text, Comment))
if comments is not None:
for comment in comments:
comment.extract()
#Remove hidden items
hitems = content.find_all(class_=['noprint', 'noscript', 'mwx.reference'])
if hitems is not None:
for item in hitems:
item.decompose()
# Mark reference/see also sections for removal
hitems = content.find_all(['h2'])
if hitems is not None:
for item in hitems:
if item.text.strip() in [u'مصادر', u'مصدر', u'المصادر', u'المصدر',
u'المرجع', u'مرجع', u'المراجع', u'مراجع',
u'انظر أيضاً', u'طالع أيضا']:
item.replace_with('\n>>>>> REMOVE <<<<<\n')
# Remove titles, images, etc.
hitems = content.find_all(['img', 'table', 'br',
'noscript', 'h2', 'ul',
'ol', 'h3', 'h4', 'h5',
'h6', 'mwx.gallery'])
if hitems is not None:
for item in hitems:
item.replace_with('\n')
#Unwrap all stylistic tags
styletags = content.find_all(['i', 'b', 'span', 'small', 'center'])
for tag in styletags:
tag.unwrap()
#Remove empty paragraphs, and remove newlines inside paragraphs
pars = content.find_all('div', class_="mwx.paragaraph")
if pars is not None:
for par in pars:
text = par.text.strip().replace('\n', ' ')
if len(text) == 0:
par.decompose()
else:
par.replace_with(text)
par.append('\n')
# Remove empty files and delete content after bibliography or see-also
lines = content.text.strip().split('\n')
if lines is None or len(lines) == 0:
return None
res = []
for line in lines:
line = line.strip()
if len(line) == 0:
continue
elif line.strip() == ">>>>> REMOVE <<<<<":
break
else:
res.append(line)
return '\n'.join(res)
def getXHTML(wikitext, title, language):
db = DummyDB()
db.normalize_and_get_page = noop
r = parseString(title=title, raw=wikitext, wikidb=db, lang=language)
if not r:
return None
preprocess(r)
removeLangLinks(r)
dbw = MWXHTMLWriter()
dbw.writeBook(r)
return dbw.asstring()
def parseWikiXML(dumppath, outdir, language):
with open(dumppath, 'r') as infile:
xmlroot = None
docID = None
docTitle = None
docText = None
inRev = False
firstIter = True
tagNdx = 0
for event, element in etree.iterparse(infile, events=("start", "end")):
if firstIter:
tagNdx = element.tag.rfind('}') + 1
firstIter = False
if element.tag[tagNdx:] == "mediawiki" and event == "start":
xmlroot = element
elif element.tag[tagNdx:] == "page" and event == "end":
try:
xhtml = getXHTML(docText, docTitle, language)
except:
xhtml = None
try:
plain_text = extract_text(xhtml)
except:
plain_text = None
if xhtml is None or plain_text is None or\
len(plain_text) < _MIN_SIZE:
print ">>> Skipping article with title"\
"'%s' and ID '%s'" %\
(docTitle.encode('utf-8'), docID.encode('utf-8'))
xmlroot.clear()
continue
docSubDir = os.path.join(outdir, hex(hash(docTitle) % 256)[2:])
if not os.path.exists(docSubDir):
os.makedirs(docSubDir)
outpath = os.path.join(docSubDir, "%s.txt" % (docID,))
with open(outpath, 'w') as outfile:
outfile.write(plain_text.encode('utf-8'))
xmlroot.clear()
elif element.tag[tagNdx:] == "revision":
if event == "start":
inRev = True
else:
inRev = False
elif element.tag[tagNdx:] == "id" and event == "end" and not inRev:
docID = element.text
if docID is not None and not isinstance(docID, unicode):
docID = docID.decode('utf-8')
elif element.tag[tagNdx:] == "title" and event == "end":
docTitle = element.text
if docTitle is not None and not isinstance(docTitle, unicode):
docTitle = docTitle.decode('utf-8')
elif element.tag[tagNdx:] == "text" and event == "end":
docText = element.text
if docText is not None and not isinstance(docText, unicode):
docText = docText.decode('utf-8')
def main(args):
parseWikiXML(args[0], args[1], 'ar')
if __name__ == '__main__':
main(sys.argv[1:])