156 lines
4.6 KiB
PHP
156 lines
4.6 KiB
PHP
<?php
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# Copyright (C) 2006 Greg Sabino Mullane <greg@turnstep.com>
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# http://www.mediawiki.org/
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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# http://www.gnu.org/copyleft/gpl.html
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## XXX Better catching of SELECT to_tsquery('the')
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/**
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* Search engine hook base class for Postgres
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* @package MediaWiki
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* @subpackage Search
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*/
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/** @package MediaWiki */
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class SearchPostgres extends SearchEngine {
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function SearchPostgres( &$db ) {
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$this->db =& $db;
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}
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/**
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* Perform a full text search query via tsearch2 and return a result set.
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* Currently searches a page's current title (p.page_title) and text (t.old_text)
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*
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* @param string $term - Raw search term
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* @return PostgresSearchResultSet
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* @access public
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*/
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function searchText( $term ) {
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$resultSet = $this->db->resultObject( $this->db->query( $this->searchQuery( $term, 'textvector' ) ) );
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return new PostgresSearchResultSet( $resultSet, $this->searchTerms );
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}
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function searchTitle( $term ) {
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$resultSet = $this->db->resultObject( $this->db->query( $this->searchQuery( $term , 'titlevector' ) ) );
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return new PostgresSearchResultSet( $resultSet, $this->searchTerms );
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}
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/*
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* Transform the user's search string into a better form for tsearch2
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*/
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function parseQuery( $filteredText, $fulltext ) {
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global $wgContLang;
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$lc = SearchEngine::legalSearchChars();
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$searchon = '';
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$this->searchTerms = array();
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# FIXME: This doesn't handle parenthetical expressions.
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if( preg_match_all( '/([-+<>~]?)(([' . $lc . ']+)(\*?)|"[^"]*")/',
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$filteredText, $m, PREG_SET_ORDER ) ) {
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foreach( $m as $terms ) {
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if( $searchon !== '' ) $searchon .= ' ';
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if($terms[1] == '') {
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$terms[1] = '+';
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}
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$searchon .= $terms[1] . $wgContLang->stripForSearch( $terms[2] );
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if( !empty( $terms[3] ) ) {
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$regexp = preg_quote( $terms[3], '/' );
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if( $terms[4] ) $regexp .= "[0-9A-Za-z_]+";
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} else {
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$regexp = preg_quote( str_replace( '"', '', $terms[2] ), '/' );
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}
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$this->searchTerms[] = $regexp;
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}
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wfDebug( "Would search with '$searchon'\n" );
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wfDebug( "Match with /\b" . implode( '\b|\b', $this->searchTerms ) . "\b/\n" );
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} else {
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wfDebug( "Can't understand search query '{$this->filteredText}'\n" );
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}
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$searchon = preg_replace('/(\s+)/','&',$searchon);
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$searchon = $this->db->strencode( $searchon );
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return $searchon;
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}
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/**
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* Construct the full SQL query to do the search.
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* @param string $filteredTerm
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* @param string $fulltext
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* @private
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*/
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function searchQuery( $filteredTerm, $fulltext ) {
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$match = $this->parseQuery( $filteredTerm, $fulltext );
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$query = "SELECT page_id, page_namespace, page_title, old_text AS page_text ".
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"FROM page p, revision r, pagecontent c WHERE p.page_latest = r.rev_id " .
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"AND r.rev_text_id = c.old_id AND $fulltext @@ to_tsquery('default','$match')";
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## Redirects
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if (! $this->showRedirects)
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$query .= ' AND page_is_redirect = 0'; ## IS FALSE
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## Namespaces - defaults to 0
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if ( count($this->namespaces) < 1)
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$query .= ' AND page_namespace = 0';
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else {
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$namespaces = implode( ',', $this->namespaces );
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$query .= " AND page_namespace IN ($namespaces)";
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}
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$query .= " ORDER BY rank($fulltext, to_tsquery('default','$fulltext')) DESC";
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$query .= $this->db->limitResult( '', $this->limit, $this->offset );
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return $query;
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}
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## These two functions are done automatically via triggers
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function update( $id, $title, $text ) { return true; }
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function updateTitle( $id, $title ) { return true; }
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} ## end of the SearchPostgres class
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/** @package MediaWiki */
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class PostgresSearchResultSet extends SearchResultSet {
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function PostgresSearchResultSet( $resultSet, $terms ) {
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$this->mResultSet = $resultSet;
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$this->mTerms = $terms;
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}
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function termMatches() {
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return $this->mTerms;
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}
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function numRows() {
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return $this->mResultSet->numRows();
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}
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function next() {
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$row = $this->mResultSet->fetchObject();
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if( $row === false ) {
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return false;
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} else {
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return new SearchResult( $row );
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}
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}
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}
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?>
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