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 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18 # http://www.gnu.org/copyleft/gpl.html
  19
  20 /**
  21  * Search engine hook for MySQL 4+
  22  * @addtogroup Search
  23  */
  24
  25 /**
  26  * @addtogroup Search
  27  */
  28 class SearchMySQL4 extends SearchMySQL {
  29         var $strictMatching = true;
  30
  31         /** @todo document */
  32         function SearchMySQL4( &$db ) {
  33                 $this->db =& $db;
  34         }
  35
  36         /** @todo document */
  37         function parseQuery( $filteredText, $fulltext ) {
  38                 global $wgContLang;
  39                 $lc = SearchEngine::legalSearchChars();
  40                 $searchon = '';
  41                 $this->searchTerms = array();
  42
  43                 # FIXME: This doesn't handle parenthetical expressions.
  44                 $m = array();
  45                 if( preg_match_all( '/([-+<>~]?)(([' . $lc . ']+)(\*?)|"[^"]*")/',
  46                           $filteredText, $m, PREG_SET_ORDER ) ) {
  47                         foreach( $m as $terms ) {
  48                                 if( $searchon !== '' ) $searchon .= ' ';
  49                                 if( $this->strictMatching && ($terms[1] == '') ) {
  50                                         $terms[1] = '+';
  51                                 }
  52                                 $searchon .= $terms[1] . $wgContLang->stripForSearch( $terms[2] );
  53                                 if( !empty( $terms[3] ) ) {
  54                                         $regexp = preg_quote( $terms[3], '/' );
  55                                         if( $terms[4] ) $regexp .= "[0-9A-Za-z_]+";
  56                                 } else {
  57                                         $regexp = preg_quote( str_replace( '"', '', $terms[2] ), '/' );
  58                                 }
  59                                 $this->searchTerms[] = $regexp;
  60                         }
  61                         wfDebug( "Would search with '$searchon'\n" );
  62                         wfDebug( 'Match with /\b' . implode( '\b|\b', $this->searchTerms ) . "\b/\n" );
  63                 } else {
  64                         wfDebug( "Can't understand search query '{$filteredText}'\n" );
  65                 }
  66
  67                 $searchon = $this->db->strencode( $searchon );
  68                 $field = $this->getIndexField( $fulltext );
  69                 return " MATCH($field) AGAINST('$searchon' IN BOOLEAN MODE) ";
  70         }
  71 }
  72 ?>