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#! /usr/bin/env python
# Copyright (c) 2007-2008 PediaPress GmbH
# See README.txt for additional licensing information.
import sys
import os
import zlib
import re
from mwlib import cdb
try:
from xml.etree import cElementTree
except ImportError:
import cElementTree
ns = '{http://www.mediawiki.org/xml/export-0.3/}'
wikiindex = "wikiidx"
wikidata = "wikidata.bin"
def normname(name):
name = name.strip().replace("_", " ")
name = name[:1].upper()+name[1:]
return name
class Tags:
page = ns + 'page'
# <title> inside <page>
title = ns + 'title'
# <revision> inside <page>
revision = ns + 'revision'
# <id> inside <revision>
revid = ns + 'id'
# <contributor><username> inside <revision>
username = ns + 'contributor/' + ns + 'username'
# <text> inside <revision>
text = ns + 'text'
# <timestamp> inside <revision>
timestamp = ns + 'timestamp'
# <revision><text> inside <page>
revision_text = ns + 'revision/' + ns + 'text'
siteinfo = ns + "siteinfo"
class DumpParser(object):
category_ns = set(['category', 'kategorie'])
image_ns = set(['image', 'bild'])
template_ns = set(['template', 'vorlage'])
wikipedia_ns = set(['wikipedia'])
tags = Tags()
def __init__(self, xmlfilename):
self.xmlfilename = xmlfilename
def _write(self, msg):
sys.stdout.write(msg)
sys.stdout.flush()
def openInputStream(self):
if self.xmlfilename.lower().endswith(".bz2"):
f = os.popen("bunzip2 -c %s" % self.xmlfilename, "r")
elif self.xmlfilename.lower().endswith(".7z"):
f = os.popen("7z -so x %s" % self.xmlfilename, "r")
else:
f = open(self.xmlfilename, "r")
return f
def __call__(self):
f = self.openInputStream()
count = 0
for event, elem in cElementTree.iterparse(f):
if elem.tag != self.tags.page:
continue
self.handlePageElement(elem)
elem.clear()
count += 1
if count % 5000 == 0:
self._write(" %s\n" % count)
elif count % 100 == 0:
self._write(".")
def handlePageElement(self, page):
title = page.find(self.tags.title).text
revisions = page.findall(self.tags.revision)
if not revisions:
return
revision = revisions[-1]
texttag = revision.find(self.tags.text)
timestamptag = revision.find(self.tags.timestamp)
revision.clear()
if texttag is not None:
text = texttag.text
texttag.clear()
else:
text = None
if timestamptag is not None:
timestamp = timestamptag.text
timestamptag.clear()
else:
timestamp = None
if not text:
return
if isinstance(title, str):
title = unicode(title)
if isinstance(text, str):
text = unicode(text)
if ':' in title:
ns, rest = title.split(':', 1)
ns = ns.lower()
if ns not in self.template_ns:
return
self.handleTemplate(rest, text, timestamp)
else:
self.handleArticle(title, text, timestamp)
def handleArticle(self, title, text, timestamp):
print "ART:", repr(title), len(text), timestamp
def handleTemplate(self, title, text, timestamp):
print "TEMPL:", repr(title), len(text), timestamp
class BuildWiki(DumpParser):
def __init__(self, xmlfilename, outputdir):
DumpParser.__init__(self, xmlfilename)
self.outputdir = outputdir
def __call__(self):
if not os.path.exists(self.outputdir):
os.makedirs(self.outputdir)
n = os.path.join(self.outputdir, wikiindex)
out = open(os.path.join(self.outputdir, wikidata), "wb")
self.out = out
f = open(n+'.cdb', 'wb')
c = cdb.CdbMake(f)
self.cdb = c
DumpParser.__call__(self)
c.finish()
f.close()
def _writeobj(self, key, val):
key = key.encode("utf-8")
val = zlib.compress(val)
pos = self.out.tell()
self.out.write(val)
self.cdb.add(key, "%s %s" % (pos, len(val)))
def handleArticle(self, title, text, timestamp):
self._writeobj(u":"+title, text.encode("utf-8"))
def handleTemplate(self, title, text, timestamp):
self._writeobj(u"T:"+title, text.encode("utf-8"))
class WikiDB(object):
redirect_rex = re.compile(r'^#Redirect:?\s*?\[\[(?P<redirect>.*?)\]\]', re.IGNORECASE)
def __init__(self, dir):
self.dir = dir
self.obj2pos_path = os.path.join(self.dir, wikidata)
self.cdb = cdb.Cdb(open(os.path.join(self.dir, wikiindex+'.cdb'), 'rb'))
def _readobj(self, key):
key = key.encode("utf-8")
try:
data = self.cdb[key]
except KeyError:
return None
pos, len = map(int, data.split())
f=open(self.obj2pos_path, "rb")
f.seek(pos)
d=f.read(len)
f.close()
return zlib.decompress(d)
def getRawArticle(self, title, raw=None, revision=None):
title = normname(title)
res = self._readobj(":"+title)
if res is None:
return None
res = unicode(res, 'utf-8')
mo = self.redirect_rex.search(res)
if mo:
redirect = mo.group('redirect')
redirect = normname(redirect.split("|", 1)[0].split("#", 1)[0])
return self.getRawArticle(redirect)
return res
def getTemplate(self, title, followRedirects=False):
if ":" in title:
title = title.split(':', 1)[1]
title = normname(title)
res = unicode(self._readobj(u"T:"+title) or "", 'utf-8')
if not res:
return res
mo = self.redirect_rex.search(res)
if mo:
redirect = mo.group('redirect')
redirect = normname(redirect.split("|", 1)[0].split("#", 1)[0])
return self.getTemplate(redirect)
return res
def articles(self):
for k, v in self.cdb:
if k[0]==':':
k = unicode(k[1:], "utf-8")
yield k
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