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<?php /** * Database search engine * * 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. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * http://www.gnu.org/copyleft/gpl.html * * @file * @ingroup Search */ use MediaWiki\Status\Status; use Wikimedia\Rdbms\DBQueryError; use Wikimedia\Rdbms\IConnectionProvider; /** * Base search engine base class for database-backed searches * @stable to extend * @ingroup Search * @since 1.23 */ abstract class SearchDatabase extends SearchEngine { /** * @var string[] search terms */ protected $searchTerms = []; protected IConnectionProvider $dbProvider; /** * @param IConnectionProvider $dbProvider */ public function __construct( IConnectionProvider $dbProvider ) { $this->dbProvider = $dbProvider; } /** * @param string $term * @return ISearchResultSet|Status|null */ final public function doSearchText( $term ) { return $this->doSearchTextInDB( $this->extractNamespacePrefix( $term ) ); } /** * Perform a full text search query and return a result set. * * @param string $term Raw search term * @return SqlSearchResultSet|null */ abstract protected function doSearchTextInDB( $term ); /** * @param string $term * @return ISearchResultSet|null */ final public function doSearchTitle( $term ) { try { return $this->doSearchTitleInDB( $this->extractNamespacePrefix( $term ) ); } catch ( DBQueryError $dqe ) { if ( $dqe->errno == 1064 ) { throw new DBQueryError( $dqe->db, "Query incompatible with database engine. For more information: " . "https://bugs.mysql.com/bug.php?id=78485 https://jira.mariadb.org/browse/MDEV-21750 / " . "https://phabricator.wikimedia.org/T355096", 1064, $dqe->sql, __METHOD__ ); } else { throw $dqe; } } } /** * Perform a title-only search query and return a result set. * * @param string $term Raw search term * @return SqlSearchResultSet|null */ abstract protected function doSearchTitleInDB( $term ); /** * Return a 'cleaned up' search string * * @param string $text * @return string */ protected function filter( $text ) { // List of chars allowed in the search query. // This must include chars used in the search syntax. // Usually " (phrase) or * (wildcards) if supported by the engine $lc = $this->legalSearchChars( self::CHARS_ALL ); return trim( preg_replace( "/[^{$lc}]/", " ", $text ) ); } /** * Extract the optional namespace prefix and set self::namespaces * accordingly and return the query string * @param string $term * @return string the query string without any namespace prefix */ final protected function extractNamespacePrefix( $term ) { $queryAndNs = self::parseNamespacePrefixes( $term ); if ( $queryAndNs === false ) { return $term; } $this->namespaces = $queryAndNs[1]; return $queryAndNs[0]; } }
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