+++ /dev/null
-<?php
-# Copyright (C) 2004 Brion Vibber <brion@pobox.com>
-# http://www.mediawiki.org/
-#
-# 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
- */
-
-/**
- * Search engine hook for MySQL 4+
- * @ingroup Search
- */
-class SearchMySQL extends SearchEngine {
- var $strictMatching = true;
-
- /** @todo document */
- function __construct( $db ) {
- $this->db = $db;
- }
-
- /**
- * Parse the user's query and transform it into an SQL fragment which will
- * become part of a WHERE clause
- */
- function parseQuery( $filteredText, $fulltext ) {
- global $wgContLang;
- $lc = SearchEngine::legalSearchChars(); // Minus format chars
- $searchon = '';
- $this->searchTerms = array();
-
- # FIXME: This doesn't handle parenthetical expressions.
- $m = array();
- if( preg_match_all( '/([-+<>~]?)(([' . $lc . ']+)(\*?)|"[^"]*")/',
- $filteredText, $m, PREG_SET_ORDER ) ) {
- foreach( $m as $terms ) {
- if( $searchon !== '' ) $searchon .= ' ';
- if( $this->strictMatching && ($terms[1] == '') ) {
- $terms[1] = '+';
- }
- $searchon .= $terms[1] . $wgContLang->stripForSearch( $terms[2] );
- if( !empty( $terms[3] ) ) {
- // Match individual terms in result highlighting...
- $regexp = preg_quote( $terms[3], '/' );
- if( $terms[4] ) {
- $regexp = "\b$regexp"; // foo*
- } else {
- $regexp = "\b$regexp\b";
- }
- } else {
- // Match the quoted term in result highlighting...
- $regexp = preg_quote( str_replace( '"', '', $terms[2] ), '/' );
- }
- $this->searchTerms[] = $regexp;
- }
- wfDebug( "Would search with '$searchon'\n" );
- wfDebug( 'Match with /' . implode( '|', $this->searchTerms ) . "/\n" );
- } else {
- wfDebug( "Can't understand search query '{$filteredText}'\n" );
- }
-
- $searchon = $this->db->strencode( $searchon );
- $field = $this->getIndexField( $fulltext );
- return " MATCH($field) AGAINST('$searchon' IN BOOLEAN MODE) ";
- }
-
- public static function legalSearchChars() {
- return "\"*" . parent::legalSearchChars();
- }
-
- /**
- * Perform a full text search query and return a result set.
- *
- * @param string $term - Raw search term
- * @return MySQLSearchResultSet
- * @access public
- */
- function searchText( $term ) {
- $resultSet = $this->db->resultObject( $this->db->query( $this->getQuery( $this->filter( $term ), true ) ) );
- return new MySQLSearchResultSet( $resultSet, $this->searchTerms );
- }
-
- /**
- * Perform a title-only search query and return a result set.
- *
- * @param string $term - Raw search term
- * @return MySQLSearchResultSet
- * @access public
- */
- function searchTitle( $term ) {
- $resultSet = $this->db->resultObject( $this->db->query( $this->getQuery( $this->filter( $term ), false ) ) );
- return new MySQLSearchResultSet( $resultSet, $this->searchTerms );
- }
-
-
- /**
- * Return a partial WHERE clause to exclude redirects, if so set
- * @return string
- * @private
- */
- function queryRedirect() {
- if( $this->showRedirects ) {
- return '';
- } else {
- return 'AND page_is_redirect=0';
- }
- }
-
- /**
- * Return a partial WHERE clause to limit the search to the given namespaces
- * @return string
- * @private
- */
- function queryNamespaces() {
- if( is_null($this->namespaces) )
- return ''; # search all
- if ( !count( $this->namespaces ) ) {
- $namespaces = '0';
- } else {
- $namespaces = $this->db->makeList( $this->namespaces );
- }
- return 'AND page_namespace IN (' . $namespaces . ')';
- }
-
- /**
- * Return a LIMIT clause to limit results on the query.
- * @return string
- * @private
- */
- function queryLimit() {
- return $this->db->limitResult( '', $this->limit, $this->offset );
- }
-
- /**
- * Does not do anything for generic search engine
- * subclasses may define this though
- * @return string
- * @private
- */
- function queryRanking( $filteredTerm, $fulltext ) {
- return '';
- }
-
- /**
- * Construct the full SQL query to do the search.
- * The guts shoulds be constructed in queryMain()
- * @param string $filteredTerm
- * @param bool $fulltext
- * @private
- */
- function getQuery( $filteredTerm, $fulltext ) {
- return $this->queryMain( $filteredTerm, $fulltext ) . ' ' .
- $this->queryRedirect() . ' ' .
- $this->queryNamespaces() . ' ' .
- $this->queryRanking( $filteredTerm, $fulltext ) . ' ' .
- $this->queryLimit();
- }
-
-
- /**
- * Picks which field to index on, depending on what type of query.
- * @param bool $fulltext
- * @return string
- */
- function getIndexField( $fulltext ) {
- return $fulltext ? 'si_text' : 'si_title';
- }
-
- /**
- * Get the base part of the search query.
- * The actual match syntax will depend on the server
- * version; MySQL 3 and MySQL 4 have different capabilities
- * in their fulltext search indexes.
- *
- * @param string $filteredTerm
- * @param bool $fulltext
- * @return string
- * @private
- */
- function queryMain( $filteredTerm, $fulltext ) {
- $match = $this->parseQuery( $filteredTerm, $fulltext );
- $page = $this->db->tableName( 'page' );
- $searchindex = $this->db->tableName( 'searchindex' );
- return 'SELECT page_id, page_namespace, page_title ' .
- "FROM $page,$searchindex " .
- 'WHERE page_id=si_page AND ' . $match;
- }
-
- /**
- * Create or update the search index record for the given page.
- * Title and text should be pre-processed.
- *
- * @param int $id
- * @param string $title
- * @param string $text
- */
- function update( $id, $title, $text ) {
- $dbw = wfGetDB( DB_MASTER );
- $dbw->replace( 'searchindex',
- array( 'si_page' ),
- array(
- 'si_page' => $id,
- 'si_title' => $title,
- 'si_text' => $text
- ), __METHOD__ );
- }
-
- /**
- * Update a search index record's title only.
- * Title should be pre-processed.
- *
- * @param int $id
- * @param string $title
- */
- function updateTitle( $id, $title ) {
- $dbw = wfGetDB( DB_MASTER );
-
- $dbw->update( 'searchindex',
- array( 'si_title' => $title ),
- array( 'si_page' => $id ),
- __METHOD__,
- array( $dbw->lowPriorityOption() ) );
- }
-}
-
-/**
- * @ingroup Search
- */
-class MySQLSearchResultSet extends SearchResultSet {
- function MySQLSearchResultSet( $resultSet, $terms ) {
- $this->mResultSet = $resultSet;
- $this->mTerms = $terms;
- }
-
- function termMatches() {
- return $this->mTerms;
- }
-
- function numRows() {
- return $this->mResultSet->numRows();
- }
-
- function next() {
- $row = $this->mResultSet->fetchObject();
- if( $row === false ) {
- return false;
- } else {
- return new SearchResult( $row );
- }
- }
-
- function free() {
- $this->mResultSet->free();
- }
-}
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