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   1  <?php
   2  /**
   3   * Database search engine
   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   * @file
  21   * @ingroup Search
  22   */
  23  
  24  /**
  25   * Base search engine base class for database-backed searches
  26   * @ingroup Search
  27   * @since 1.23
  28   */
  29  class SearchDatabase extends SearchEngine {
  30      /**
  31       * @var DatabaseBase Slave database for reading from for results
  32       */
  33      protected $db;
  34  
  35      /**
  36       * Constructor
  37       * @param DatabaseBase $db The database to search from
  38       */
  39  	public function __construct( DatabaseBase $db = null ) {
  40          if ( $db ) {
  41              $this->db = $db;
  42          } else {
  43              $this->db = wfGetDB( DB_SLAVE );
  44          }
  45      }
  46  
  47      /**
  48       * Return a 'cleaned up' search string
  49       *
  50       * @param string $text
  51       * @return string
  52       */
  53  	protected function filter( $text ) {
  54          $lc = $this->legalSearchChars();
  55          return trim( preg_replace( "/[^{$lc}]/", " ", $text ) );
  56      }
  57  }