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#!/usr/bin/python3
import sys, os, re
import bz2
import html, mwxml, mwparserfromhell
import sqlite3
usageInfo = f"""
Usage: {sys.argv[0]}
Reads through the wiki dump, and attempts to
parse short-descriptions, and add them to a database.
"""
if len(sys.argv) > 1:
print(usageInfo, file=sys.stderr)
sys.exit(1)
dumpFile = "enwiki-20220501-pages-articles-multistream.xml.bz2" # Had about 22e6 pages
enwikiDb = "descData.db"
# In testing, this script took over 10 hours to run, and generated about 5GB
descLineRegex = re.compile("^ *[A-Z'\"]")
embeddedHtmlRegex = re.compile(r"<[^<]+/>|<!--[^<]+-->|<[^</]+>([^<]*|[^<]*<[^<]+>[^<]*)</[^<]+>|<[^<]+$")
# Recognises a self-closing HTML tag, a tag with 0 children, tag with 1 child with 0 children, or unclosed tag
convertTemplateRegex = re.compile(r"{{convert\|(\d[^|]*)\|(?:(to|-)\|(\d[^|]*)\|)?([a-z][^|}]*)[^}]*}}")
def convertTemplateReplace(match):
if match.group(2) == None:
return f"{match.group(1)} {match.group(4)}"
else:
return f"{match.group(1)} {match.group(2)} {match.group(3)} {match.group(4)}"
parensGroupRegex = re.compile(r" \([^()]*\)")
leftoverBraceRegex = re.compile(r"(?:{\||{{).*")
def parseDesc(text):
# Find first matching line outside {{...}}, [[...]], and block-html-comment constructs,
# and then accumulate lines until a blank one.
# Some cases not accounted for include: disambiguation pages, abstracts with sentences split-across-lines,
# nested embedded html, 'content significant' embedded-html, markup not removable with mwparsefromhell,
lines = []
openBraceCount = 0
openBracketCount = 0
inComment = False
skip = False
for line in text.splitlines():
line = line.strip()
if len(lines) == 0:
if len(line) > 0:
if openBraceCount > 0 or line[0] == "{":
openBraceCount += line.count("{")
openBraceCount -= line.count("}")
skip = True
if openBracketCount > 0 or line[0] == "[":
openBracketCount += line.count("[")
openBracketCount -= line.count("]")
skip = True
if inComment or line.find("<!--") != -1:
if line.find("-->") != -1:
if inComment:
inComment = False
skip = True
else:
inComment = True
skip = True
if skip:
skip = False
continue
if line[-1] == ":": # Seems to help avoid disambiguation pages
return None
if descLineRegex.match(line) != None:
lines.append(line)
else:
if len(line) == 0:
return removeMarkup(" ".join(lines))
lines.append(line)
if len(lines) > 0:
return removeMarkup(" ".join(lines))
return None
def removeMarkup(content):
content = embeddedHtmlRegex.sub("", content)
content = convertTemplateRegex.sub(convertTemplateReplace, content)
content = mwparserfromhell.parse(content).strip_code() # Remove wikitext markup
content = parensGroupRegex.sub("", content)
content = leftoverBraceRegex.sub("", content)
return content
def convertTitle(title):
return html.unescape(title).replace("_", " ")
print("Creating database")
if os.path.exists(enwikiDb):
raise Exception(f"ERROR: Existing {enwikiDb}")
dbCon = sqlite3.connect(enwikiDb)
dbCur = dbCon.cursor()
dbCur.execute("CREATE TABLE pages (id INT PRIMARY KEY, title TEXT UNIQUE)")
dbCur.execute("CREATE INDEX pages_title_idx ON pages(title COLLATE NOCASE)")
dbCur.execute("CREATE TABLE redirects (id INT PRIMARY KEY, target TEXT)")
dbCur.execute("CREATE INDEX redirects_idx ON redirects(target)")
dbCur.execute("CREATE TABLE descs (id INT PRIMARY KEY, desc TEXT)")
print("Iterating through dump file")
with bz2.open(dumpFile, mode='rt') as file:
dump = mwxml.Dump.from_file(file)
pageNum = 0
for page in dump:
pageNum += 1
if pageNum % 1e4 == 0:
print(f"At page {pageNum}")
if pageNum > 3e4:
break
# Parse page
if page.namespace == 0:
try:
dbCur.execute("INSERT INTO pages VALUES (?, ?)", (page.id, convertTitle(page.title)))
except sqlite3.IntegrityError as e:
# Accounts for certain pages that have the same title
print(f"Failed to add page with title \"{page.title}\": {e}", file=sys.stderr)
continue
if page.redirect != None:
dbCur.execute("INSERT INTO redirects VALUES (?, ?)", (page.id, convertTitle(page.redirect)))
else:
revision = next(page)
desc = parseDesc(revision.text)
if desc != None:
dbCur.execute("INSERT INTO descs VALUES (?, ?)", (page.id, desc))
print("Closing database")
dbCon.commit()
dbCon.close()
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