includes/SearchMySQL4.php

   1 <?php
   2 # Copyright (C) 2004 Brion Vibber <brion@pobox.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 MySQL 4+
  22  * @package MediaWiki
  23  * @subpackage Search
  24  */
  25
  26 /** */
  27 require_once( 'SearchEngine.php' );
  28
  29 /**
  30  * @package MediaWiki
  31  * @subpackage Search
  32  */
  33 class SearchMySQL4 extends SearchEngine {
  34         var $strictMatching = true;
  35
  36         /** @todo document */
  37         function SearchMySQL4( &$db ) {
  38                 $this->db =& $db;
  39         }
  40
  41         /** @todo document */
  42         function getIndexField( $fulltext ) {
  43                 return $fulltext ? 'si_text' : 'si_title';
  44         }
  45
  46         /** @todo document */
  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 = $this->db->strencode( $searchon );
  77                 $field = $this->getIndexField( $fulltext );
  78                 return " MATCH($field) AGAINST('$searchon' IN BOOLEAN MODE) ";
  79         }
  80
  81         /** @todo document */
  82         function queryMain( $filteredTerm, $fulltext ) {
  83                 $match = $this->parseQuery( $filteredTerm, $fulltext );
  84                 $page        = $this->db->tableName( 'page' );
  85                 $revision    = $this->db->tableName( 'revision' );
  86                 $text        = $this->db->tableName( 'text' );
  87                 $searchindex = $this->db->tableName( 'searchindex' );
  88                 return 'SELECT page_id, page_namespace, page_title, old_flags, old_text ' .
  89                         "FROM $page,$revision,$text,$searchindex " .
  90                         'WHERE page_id=si_page AND page_latest=rev_id AND rev_text_id=old_id AND ' . $match;
  91         }
  92
  93         /** @todo document */
  94     function update( $id, $title, $text ) {
  95             $dbw=& wfGetDB(DB_MASTER);
  96             $dbw->replace( 'searchindex', array(array('si_page')),
  97                     array(
  98                             'si_page' => $id,
  99                             'si_title' => $title,
 100                             'si_text' => $text
 101                     ), 'SearchMySQL4::update' );
 102     }
 103
 104         /** @todo document */
 105     function updateTitle($id,$title) {
 106             $dbw=& wfGetDB(DB_MASTER);
 107             $lowpri=$dbw->lowPriorityOption();
 108             $searchindex = $dbw->tableName( 'searchindex' );
 109
 110             $sql = "UPDATE $lowpri $searchindex SET si_title='" .
 111                       $dbw->strencode( $title ) .
 112                       "' WHERE si_page={$id}";
 113
 114             $dbw->query( $sql, "SearchMySQL4::updateTitle" );
 115     }
 116 }
 117 ?>