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#!/usr/bin/env ruby
#------------------------------------------------------------------------------
#
# extract_words.rb [DIR]
#
#------------------------------------------------------------------------------
#
# Extracts words from wiki pages into their own table for full-text search.
#
#------------------------------------------------------------------------------
#
# Copyright (C) 2013 Jochen Topf <jochen@remote.org>
#
# 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 2 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
#------------------------------------------------------------------------------
require 'sqlite3'
#------------------------------------------------------------------------------
class Words
def initialize
@words = Hash.new
end
def add(key, value, lang, word)
entry = [key, value]
if @words[word]
@words[word] << entry
else
@words[word] = [entry]
end
end
# Remove words that appear too often
def cleanup
@words.delete_if do |k, v|
v.size >= 10
end
end
def invert
@kvw = []
@words.each do |word, entries|
entries.each do |entry|
key = entry[0]
value = entry[1] || ''
@kvw << [key, value, word]
end
end
end
def dump
lastkey = ''
lastvalue = ''
words = []
@kvw.sort.uniq.each do |key, value, word|
if key != lastkey || value != lastvalue
yield lastkey, lastvalue, words.join(',')
words = []
lastkey = key
lastvalue = value
else
words << word
end
end
yield lastkey, lastvalue, words.join(',')
end
end
#------------------------------------------------------------------------------
class WordExtractor
def initialize(words)
@words = words
end
def interested_in(word, key, value, lang)
# not interested in very short words
return false if word.size <= 2
# digits make for bad words
return false if word =~ /\d/
# # not interested if word == key or == value
# key.downcase!
# value.downcase! unless value.nil?
# return false if word == key || word == value
return true
end
def parse(key, value, lang, text)
words = text.scan(/\w+/).sort.uniq
words.each do |word|
word.downcase!
if interested_in(word, key, value, lang)
@words.add(key, value, lang, word)
end
end
end
end
#------------------------------------------------------------------------------
dir = ARGV[0] || '.'
db = SQLite3::Database.new(dir + '/taginfo-wiki.db')
db.results_as_hash = true
#------------------------------------------------------------------------------
words = Words.new
we = WordExtractor.new(words)
db.execute("SELECT * FROM wikipages") do |row|
# puts "key=#{ row['key'] } value=#{ row['value'] } lang=#{ row['lang'] }"
we.parse(row['key'], row['value'], row['lang'], row['body'])
end
words.cleanup
words.invert
#words.dump do |key, value, words|
# puts "#{key}=#{value}: #{words}"
#end
db.transaction do |db|
words.dump do |key, value, words|
db.execute('INSERT INTO words (key, value, words) VALUES (?, ?, ?)', key, value, words)
end
end
#-- THE END -------------------------------------------------------------------
|