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wiktbsearch.py
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wiktbsearch.py
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import io
import math
import os
import platform
import re
import struct
import sys # for commandline arguments (sys.argv)
# read dump path from config file
config_file_name = os.path.expanduser(os.path.join('~', '.wikipath'))
config_file = open(config_file_name, encoding = 'UTF-8')
config_line = config_file.readline().rstrip()
dumppath = config_line;
# parse commandline
[dumpcode, dumpdate, needle] = [sys.argv[1], sys.argv[2], sys.argv[3]]
# build names of index files
class Dump:
# dump file
file_name = dumpcode + 'wiktionary-' + dumpdate
# enwiktionary-YYYYMMDD-pages-articles.xml
file_name += '-pages-articles.xml'
# mediawikiwiki-YYYYMMDD-pages-meta-history.xml
# en-wikt-YYYYMMDD.xml
# raw offsets into dump file
# enYYYYMMDD-off.raw
offset_file_name = dumpcode + dumpdate + '-off.raw'
# titles file
# enYYYYMMDD-all(-norm).txt
title_file_name = dumpcode + dumpdate + '-all.txt'
# raw offsets into titles file
# enYYYYMMDD-all(-norm)-off.raw
title_offset_file_name = dumpcode + dumpdate + '-all-off.raw'
# sorted index of titles
# enYYYYMMDD-all(-norm)-idx.raw
title_sorted_index_file_name = dumpcode + dumpdate + '-all-idx.raw'
dump = Dump();
# open index files
dump.file = open(dumppath + dump.file_name, encoding = 'UTF-8')
dump.offset_file = open(dumppath + dump.offset_file_name, mode = 'rb')
dump.title_file = open(dumppath + dump.title_file_name, encoding = 'UTF-8')
dump.title_offset_file = open(dumppath + dump.title_offset_file_name, mode = 'rb')
dump.title_sorted_index_file = open(dumppath + dump.title_sorted_index_file_name, mode = 'rb')
# decide kind of index based on lengths of index files
if os.path.getsize(dumppath + dump.title_offset_file_name) == os.path.getsize(dumppath + dump.title_sorted_index_file_name):
dump.size = os.path.getsize(dumppath + dump.title_offset_file_name) / 4
index_record_size = os.path.getsize(dumppath + dump.offset_file_name) / os.path.getsize(dumppath + dump.title_offset_file_name)
if index_record_size == 3:
print('new dump format can handle huge files and multiple revisions')
elif index_record_size == 1:
print('old dump format can handle typical sized files without revisions')
else:
print('unknown ratio ' + index_record_size)
raise NameError('two')
index_record_size = int(index_record_size)
else:
raise NameError('size of all-off.raw does not match size of all-idx.raw')
# search
def gettitle(index_s):
#index_s < dumpsize || die "sorted index $index_s too big";
# *-all-idx.raw
dump.title_sorted_index_file.seek(index_s * 4, 0)
index_r = dump.title_sorted_index_file.read(4)
# FIXME Linux: struct.error: unpack requires a bytes argument of length 8
index_r = struct.unpack("<L", index_r)[0]
#$index_r < $haystacksize || die "raw index $index_r too big (sorted index $index_s)";
# *-all-off.raw
dump.title_offset_file.seek(index_r * 4, 0)
offset = dump.title_offset_file.read(4)
offset = struct.unpack("<L", offset)[0]
#$offset < -s TFH || die "title offset $offset too big";
dump.title_file.seek(offset, 0)
title = dump.title_file.readline().rstrip()
return title
def bsearch(needle):
compcount = 0
low = 0
high = dump.size - 1
midpoint = 0
while (low <= high):
midpoint = int((low + high) / 2)
t = gettitle(midpoint)
compcount += 1
if (needle == t):
return (midpoint, compcount)
elif (needle < t):
high = midpoint - 1
else:
low = midpoint + 1
return (low - 0.5, compcount)
def getarticle(index_s):
print('sorted index: {}'.format(index_s))
#index_s < dumpsize || die "sorted index $index_s too big";
# *-all-idx.raw
dump.title_sorted_index_file.seek(index_s * 4, 0)
index_r = dump.title_sorted_index_file.read(4)
index_r = struct.unpack("<L", index_r)[0]
print('raw index: {}'.format(index_r))
#$index_r < $haystacksize || die "raw index $index_r too big (sorted index $index_s)";
## *-off.raw
if index_record_size == 3:
dump.offset_file.seek(index_r * index_record_size * 4, 0)
offset = dump.offset_file.read(8)
revoffset = dump.offset_file.read(4)
offset = struct.unpack("<Q", offset)[0]
print('article offset {}'.format(offset))
revoffset = struct.unpack("<L", revoffset)[0]
print('revision offset {}'.format(revoffset))
offset += revoffset
print('dump offset {}'.format(offset))
elif index_record_size == 1:
dump.offset_file.seek(index_r * index_record_size * 4, 0)
offset = dump.offset_file.read(4)
offset = struct.unpack("<L", offset)[0]
print('article offset {}'.format(offset))
print('dump offset {}'.format(offset))
else:
#die "** unhandled dump offset size $dumpoffsize\n";
print('die!')
#$offset < -s DFH || die "article offset $offset too big";
dump.file.seek(offset, 0)
while True:
l = dump.file.readline()
if re.search(r'<text ', l):
break
l = re.sub(r'^.*<text .*>', r'', l)
art = l
while True:
l = dump.file.readline()
if re.search(r'<\/text>', l):
break
art += l
l = re.sub(r'<\/text>', r'', l)
art += l
print(art)
def search(needle):
(index, count) = bsearch(needle)
if isinstance(index, (int)):
print('"{0:s}" found at index {1:d} ({2:d} compares)'.format(needle, index, count))
getarticle(index)
elif isinstance(index, (float)):
before = math.floor(index)
context = ' '
if before < 0:
context = ' first before "{0:s}"'.format(gettitle(before+1))
else:
context = ' between "{0:s}" and "{1:s}"'.format(gettitle(before), gettitle(before+1))
print('"{0:s}" not found, belongs at {1:.1f}{2:s} ({3:d} compares)'.format(needle, index, context, count))
else:
print('WTF?')
search(needle)
##############################################################################