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<?php
/*
* Nucleus: PHP/MySQL Weblog CMS (http://nucleuscms.org/)
* Copyright (C) 2003-2005 The Nucleus Group
*
* 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.
* (see nucleus/documentation/index.html#license for more info)
*/
/**
* SEARCH(querystring) offers different functionality to create an
* SQL query to find certain items. (and comments)
*
* based on code by David Altherr:
* http://www.evolt.org/article/Boolean_Fulltext_Searching_with_PHP_and_MySQL/18/15665/
* http://davidaltherr.net/web/php_functions/boolean/funcs.mysql.boolean.txt
*
* @license http://nucleuscms.org/license.txt GNU General Public License
* @copyright Copyright (C) 2002-2005 The Nucleus Group
* @version $Id: SEARCH.php,v 1.15.2.1 2005/08/15 10:50:12 dekarma Exp $
*/
class SEARCH {
var $querystring;
var $marked;
var $inclusive;
var $blogs;
function SEARCH($text) {
global $blogid;
$text = preg_replace ("/[<,>,=,?,!,#,^,(,),[,\],:,;,\\\,%]/","",$text);
$this->querystring = $text;
$this->marked = $this->boolean_mark_atoms($text);
$this->inclusive = $this->boolean_inclusive_atoms($text);
$this->blogs = array();
// get all public searchable blogs, no matter what, include the current blog allways.
$res = sql_query('SELECT bnumber FROM '.sql_table('blog').' WHERE bincludesearch=1 ');
while ($obj = mysql_fetch_object($res))
$this->blogs[] = intval($obj->bnumber);
}
function boolean_sql_select($match){
if (strlen($this->inclusive) > 0) {
/* build sql for determining score for each record */
$result=explode(" ",$this->inclusive);
for($cth=0;$cth<count($result);$cth++){
if(strlen($result[$cth])>=4){
$stringsum_long .= " $result[$cth] ";
}else{
$stringsum_a[] = ' '.$this->boolean_sql_select_short($result[$cth],$match).' ';
}
}
if(strlen($stringsum_long)>0){
$stringsum_long = addslashes($stringsum_long);
$stringsum_a[] = " match ($match) against ('$stringsum_long') ";
}
$stringsum .= implode("+",$stringsum_a);
return $stringsum;
}
}
function boolean_inclusive_atoms($string){
$result=trim($string);
$result=preg_replace("/([[:space:]]{2,})/",' ',$result);
/* convert normal boolean operators to shortened syntax */
$result=eregi_replace(' not ',' -',$result);
$result=eregi_replace(' and ',' ',$result);
$result=eregi_replace(' or ',',',$result);
/* drop unnecessary spaces */
$result=str_replace(' ,',',',$result);
$result=str_replace(', ',',',$result);
$result=str_replace('- ','-',$result);
$result=str_replace('+','',$result);
/* strip exlusive atoms */
$result=preg_replace(
"(\-\([A-Za-z0-9]{1,}[A-Za-z0-9\-\.\_\,]{0,}\))",
'',
$result);
$result=str_replace('(',' ',$result);
$result=str_replace(')',' ',$result);
$result=str_replace(',',' ',$result);
return $result;
}
function boolean_sql_where($match){
$result = $this->marked;
$result = preg_replace(
"/foo\[\(\'([^\)]{4,})\'\)\]bar/e",
" 'match ('.\$match.') against (\''.\$this->copyvalue(\"$1\").'\') > 0 ' ",
$result);
$result = preg_replace(
"/foo\[\(\'([^\)]{1,3})\'\)\]bar/e",
" '('.\$this->boolean_sql_where_short(\"$1\",\"$match\").')' ",
$result);
return $result;
}
// there must be a simple way to simply copy a value with backslashes in it through
// the preg_replace, but I cannot currently find it (karma 2003-12-30)
function copyvalue($foo) {
return $foo;
}
function boolean_mark_atoms($string){
$result=trim($string);
$result=preg_replace("/([[:space:]]{2,})/",' ',$result);
/* convert normal boolean operators to shortened syntax */
$result=eregi_replace(' not ',' -',$result);
$result=eregi_replace(' and ',' ',$result);
$result=eregi_replace(' or ',',',$result);
/* strip excessive whitespace */
$result=str_replace('( ','(',$result);
$result=str_replace(' )',')',$result);
$result=str_replace(', ',',',$result);
$result=str_replace(' ,',',',$result);
$result=str_replace('- ','-',$result);
$result=str_replace('+','',$result);
// remove double spaces (we might have introduced some new ones above)
$result=trim($result);
$result=preg_replace("/([[:space:]]{2,})/",' ',$result);
/* apply arbitrary function to all 'word' atoms */
$result_a = explode(" ",$result);
for($word=0;$word<count($result_a);$word++){
$result_a[$word] = "foo[('".$result_a[$word]."')]bar";
}
$result = implode(" ",$result_a);
/* dispatch ' ' to ' AND ' */
$result=str_replace(' ',' AND ',$result);
/* dispatch ',' to ' OR ' */
$result=str_replace(',',' OR ',$result);
/* dispatch '-' to ' NOT ' */
$result=str_replace(' -',' NOT ',$result);
return $result;
}
function boolean_sql_where_short($string,$match){
$match_a = explode(',',$match);
for($ith=0;$ith<count($match_a);$ith++){
$like_a[$ith] = " $match_a[$ith] LIKE '% $string %' ";
}
$like = implode(" OR ",$like_a);
return $like;
}
function boolean_sql_select_short($string,$match){
$match_a = explode(',',$match);
$score_unit_weight = .2;
for($ith=0;$ith<count($match_a);$ith++){
$score_a[$ith] =
" $score_unit_weight*(
LENGTH(" . addslashes($match_a[$ith]) . ") -
LENGTH(REPLACE(LOWER(" . addslashes($match_a[$ith]) . "),LOWER('" . addslashes($string) . "'),'')))
/LENGTH('" . addslashes($string) . "') ";
}
$score = implode(" + ",$score_a);
return $score;
}
}
?>
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