includes/SearchTsearch2.php

   1 <?php
   2 # Copyright (C) 2004 Brion Vibber <brion@pobox.com>, Domas Mituzas <domas.mituzas@gmail.com>
   3 # http://www.mediawiki.org/
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 2 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License along
  16 # with this program; if not, write to the Free Software Foundation, Inc.,
  17 # 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18 # http://www.gnu.org/copyleft/gpl.html
  19
  20 /**
  21  * Search engine hook for PostgreSQL / Tsearch2
  22  * @package MediaWiki
  23  * @subpackage Search
  24  */
  25
  26 /** */
  27 require_once( 'SearchEngine.php' );
  28
  29 /**
  30  * @todo document
  31  * @package MediaWiki
  32  * @subpackage Search
  33  */
  34 class SearchTsearch2 extends SearchEngine {
  35         var $strictMatching = false;
  36
  37         function SearchTsearch2( &$db ) {
  38                 $this->db =& $db;
  39                 $this->db->setSchema('tsearch');
  40                 $this->mRanking = true;
  41         }
  42
  43         function getIndexField( $fulltext ) {
  44                 return $fulltext ? 'si_text' : 'si_title';
  45         }
  46
  47         function parseQuery( $filteredText, $fulltext ) {
  48                 global $wgContLang;
  49                 $lc = SearchEngine::legalSearchChars();
  50                 $searchon = '';
  51                 $this->searchTerms = array();
  52
  53                 # FIXME: This doesn't handle parenthetical expressions.
  54                 if( preg_match_all( '/([-+<>~]?)(([' . $lc . ']+)(\*?)|"[^"]*")/',
  55                           $filteredText, $m, PREG_SET_ORDER ) ) {
  56                         foreach( $m as $terms ) {
  57                                 if( $searchon !== '' ) $searchon .= ' ';
  58                                 if( $this->strictMatching && ($terms[1] == '') ) {
  59                                         $terms[1] = '+';
  60                                 }
  61                                 $searchon .= $terms[1] . $wgContLang->stripForSearch( $terms[2] );
  62                                 if( !empty( $terms[3] ) ) {
  63                                         $regexp = preg_quote( $terms[3], '/' );
  64                                         if( $terms[4] ) $regexp .= "[0-9A-Za-z_]+";
  65                                 } else {
  66                                         $regexp = preg_quote( str_replace( '"', '', $terms[2] ), '/' );
  67                                 }
  68                                 $this->searchTerms[] = $regexp;
  69                         }
  70                         wfDebug( "Would search with '$searchon'\n" );
  71                         wfDebug( "Match with /\b" . implode( '\b|\b', $this->searchTerms ) . "\b/\n" );
  72                 } else {
  73                         wfDebug( "Can't understand search query '{$this->filteredText}'\n" );
  74                 }
  75
  76                 $searchon = preg_replace('/(\s+)/','&',$searchon);
  77                 $searchon = $this->db->strencode( $searchon );
  78                 return $searchon;
  79         }
  80
  81         function queryRanking($filteredTerm, $fulltext) {
  82                 $field = $this->getIndexField( $fulltext );
  83                 $searchon = $this->parseQuery($filteredTerm,$fulltext);
  84                 if ($this->mRanking)
  85                         return " ORDER BY rank($field,to_tsquery('$searchon')) DESC";
  86                 else
  87                         return "";
  88         }
  89
  90
  91         function queryMain( $filteredTerm, $fulltext ) {
  92                 $match = $this->parseQuery( $filteredTerm, $fulltext );
  93                 $field = $this->getIndexField( $fulltext );
  94                 $cur = $this->db->tableName( 'cur' );
  95                 $searchindex = $this->db->tableName( 'searchindex' );
  96                 return 'SELECT cur_id, cur_namespace, cur_title, cur_text ' .
  97                         "FROM $cur,$searchindex " .
  98                         'WHERE cur_id=si_page AND ' .
  99                         " $field @@ to_tsquery ('$match') " ;
 100         }
 101
 102         function update( $id, $title, $text ) {
 103                 $dbw=& wfGetDB(DB_MASTER);
 104                 $searchindex = $dbw->tableName( 'searchindex' );
 105                 $sql = "DELETE FROM $searchindex WHERE si_page={$id}";
 106                 $dbw->query($sql,"SearchTsearch2:update");
 107                 $sql = "INSERT INTO $searchindex (si_page,si_title,si_text) ".
 108                         " VALUES ( $id, to_tsvector('".
 109                                 $dbw->strencode($title).
 110                                 "'),to_tsvector('".
 111                                 $dbw->strencode( $text)."')) ";
 112                 $dbw->query($sql,"SearchTsearch2:update");
 113         }
 114
 115         function updateTitle($id,$title) {
 116                 $dbw=& wfGetDB(DB_MASTER);
 117                 $searchindex = $dbw->tableName( 'searchindex' );
 118                 $sql = "UPDATE $searchindex SET si_title=to_tsvector('" .
 119                           $db->strencode( $title ) .
 120                           "') WHERE si_page={$id}";
 121
 122                 $dbw->query( $sql, "SearchMySQL4::updateTitle" );
 123         }
 124
 125 }
 126
 127 ?>