1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
#!/usr/bin/python3
import sys, os, re
import bz2
import html, mwxml, mwparserfromhell
import sqlite3
usageInfo = f"usage: {sys.argv[0]}\n"
usageInfo += "Reads a Wikimedia enwiki dump, and adds page, redirect,\n"
usageInfo += "and short-description info to an sqlite db.\n"
if len(sys.argv) > 1:
print(usageInfo, file=sys.stderr)
sys.exit(1)
dumpFile = "enwiki-20220501-pages-articles-multistream.xml.bz2" # 22,034,540 pages
enwikiDb = "enwikiData.db"
# Some regexps and functions for parsing wikitext
descLineRegex = re.compile("^ *[A-Z'\"]")
embeddedHtmlRegex = re.compile(r"<[^<]+/>|<!--[^<]+-->|<[^</]+>([^<]*|[^<]*<[^<]+>[^<]*)</[^<]+>|<[^<]+$")
# Recognises a self-closing HTML tag, a tag 0 children, tag with 1 child with 0 children, or unclosed tag
convertTemplateRegex = re.compile(r"{{convert\|(\d[^|]*)\|(?:(to|-)\|(\d[^|]*)\|)?([a-z][^|}]*)[^}]*}}")
parensGrpRegex = re.compile(r" \([^()]*\)")
leftoverBraceRegex = re.compile(r"(?:{\||{{).*")
def convertTemplateReplace(match):
if match.group(2) == None:
return "{} {}".format(match.group(1), match.group(4))
else:
return "{} {} {} {}".format(match.group(1), match.group(2), match.group(3), match.group(4))
def parseDesc(text):
# Find first matching line outside a {{...}} and [[...]] block-html-comments, then accumulate lines until a blank
# Some cases not accounted for: 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 = parensGrpRegex.sub("", content)
content = leftoverBraceRegex.sub("", content)
return content
# Other helper functions
def convertTitle(title):
return html.unescape(title).replace("_", " ")
# Check for existing db
if os.path.exists(enwikiDb):
print("ERROR: Existing {}".format(enwikiDb), file=sys.stderr)
sys.exit(1)
# Create db
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)")
# Read through dump file
print("Reading 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("At page {}".format(pageNum))
# 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("Failed to add page with title \"{}\": {}".format(page.title, e))
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))
# Close db
dbCon.commit()
dbCon.close()
|
