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<?php
/**
* DokuWiki fulltextsearch functions using the index
*
* @license GPL 2 (http://www.gnu.org/licenses/gpl.html)
* @author Andreas Gohr <andi@splitbrain.org>
*/
if(!defined('DOKU_INC')) define('DOKU_INC',realpath(dirname(__FILE__).'/../').'/');
require_once(DOKU_INC.'inc/indexer.php');
/**
* The fulltext search
*
* Returns a list of matching documents for the given query
*/
function ft_pageSearch($query){
$q = ft_queryParser($query);
// lookup all words found in the query
$words = array_merge($q['and'],$q['not']);
foreach($q['phrases'] as $phrase){
$words = array_merge($words,$phrase['words']);
}
if(!count($words)) return array();
$result = idx_lookup($words);
// merge search results with query
foreach($q['and'] as $pos => $w){
$q['and'][$pos] = $result[$w];
}
// create a list of unwanted docs
$not = array();
foreach($q['not'] as $pos => $w){
$not = array_merge($not,array_keys($result[$w]));
}
// combine and words
if(count($q['and']) > 1){
$docs = ft_resultCombine($q['and']);
}else{
$docs = $q['and'][0];
}
if(!count($docs)) return array();
// remove negative matches
foreach($not as $n){
unset($docs[$n]);
}
if(!count($docs)) return array();
// handle phrases
if(count($q['phrases'])){
//build a regexp
$q['phrases'] = array_map('utf8_strtolower',$q['phrases']);
$q['phrases'] = array_map('preg_quote',$q['phrases']);
$regex = '('.join('|',$q['phrases']).')';
// check the source of all documents for the exact phrases
foreach(array_keys($docs) as $id){
$text = utf8_strtolower(rawWiki($id));
if(!preg_match_all('/'.$regex.'/usi',$text)){
unset($docs[$id]); // no hit - remove
}
}
}
if(!count($docs)) return array();
// if there are any hits left, sort them by count
arsort($docs);
return $docs;
}
/**
* Combine found documents and sum up their scores
*
* This function is used to combine searched words with a logical
* AND. Only documents available in all arrays are returned.
*
* based upon PEAR's PHP_Compat function for array_intersect_key()
*
* @param array $args An array of page arrays
*/
function ft_resultCombine($args){
$array_count = count($args);
$result = array();
foreach ($args[0] as $key1 => $value1) {
for ($i = 1; $i !== $array_count; $i++) {
foreach ($args[$i] as $key2 => $value2) {
if ((string) $key1 === (string) $key2) {
if(!isset($result[$key1])) $result[$key1] = $value1;
$result[$key1] += $value2;
}
}
}
}
return $result;
}
/**
* Builds an array of search words from a query
*
* @todo support OR and parenthesises?
*/
function ft_queryParser($query){
global $conf;
$swfile = DOKU_INC.'inc/lang/'.$conf['lang'].'/stopwords.txt';
if(@file_exists($swfile)){
$stopwords = file($swfile);
}else{
$stopwords = array();
}
$q = array();
$q['query'] = $query;
$q['phrases'] = array();
$q['and'] = array();
$q['not'] = array();
// handle phrase searches
while(preg_match('/"(.*?)"/',$query,$match)){
$q['phrases'][] = $match[0];
$q['and'] = array_merge(idx_tokenizer($match[0],$stopwords));
$query = preg_replace('/"(.*?)"/','',$query,1);
}
$words = explode(' ',$query);
foreach($words as $w){
if($w{0} == '-'){
$token = idx_tokenizer($w,$stopwords);
if(count($token)) $q['not'] = array_merge($q['not'],$token);
}else{
$token = idx_tokenizer($w,$stopwords);
if(count($token)) $q['and'] = array_merge($q['and'],$token);
}
}
return $q;
}
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