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<?php
# Copyright (C) 2006 Greg Sabino Mullane <greg@turnstep.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
## XXX Better catching of SELECT to_tsquery('the')
/**
* Search engine hook base class for Postgres
* @package MediaWiki
* @subpackage Search
*/
/** @package MediaWiki */
class SearchPostgres extends SearchEngine {
function SearchPostgres( &$db ) {
$this->db =& $db;
}
/**
* Perform a full text search query via tsearch2 and return a result set.
* Currently searches a page's current title (p.page_title) and text (t.old_text)
*
* @param string $term - Raw search term
* @return PostgresSearchResultSet
* @access public
*/
function searchText( $term ) {
$resultSet = $this->db->resultObject( $this->db->query( $this->searchQuery( $term, 'textvector' ) ) );
return new PostgresSearchResultSet( $resultSet, $this->searchTerms );
}
function searchTitle( $term ) {
$resultSet = $this->db->resultObject( $this->db->query( $this->searchQuery( $term , 'titlevector' ) ) );
return new PostgresSearchResultSet( $resultSet, $this->searchTerms );
}
/*
* Transform the user's search string into a better form for tsearch2
*/
function parseQuery( $filteredText, $fulltext ) {
global $wgContLang;
$lc = SearchEngine::legalSearchChars();
$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 !== '' ) $searchon .= ' ';
if($terms[1] == '') {
$terms[1] = '+';
}
$searchon .= $terms[1] . $wgContLang->stripForSearch( $terms[2] );
if( !empty( $terms[3] ) ) {
$regexp = preg_quote( $terms[3], '/' );
if( $terms[4] ) $regexp .= "[0-9A-Za-z_]+";
} else {
$regexp = preg_quote( str_replace( '"', '', $terms[2] ), '/' );
}
$this->searchTerms[] = $regexp;
}
wfDebug( "Would search with '$searchon'\n" );
wfDebug( 'Match with /\b' . implode( '\b|\b', $this->searchTerms ) . "\b/\n" );
} else {
wfDebug( "Can't understand search query '{$this->filteredText}'\n" );
}
$searchon = preg_replace('/(\s+)/','&',$searchon);
$searchon = $this->db->strencode( $searchon );
return $searchon;
}
/**
* Construct the full SQL query to do the search.
* @param string $filteredTerm
* @param string $fulltext
* @private
*/
function searchQuery( $filteredTerm, $fulltext ) {
$match = $this->parseQuery( $filteredTerm, $fulltext );
$query = "SELECT page_id, page_namespace, page_title, old_text AS page_text, ".
"rank(titlevector, to_tsquery('default','$match')) AS rnk ".
"FROM page p, revision r, pagecontent c WHERE p.page_latest = r.rev_id " .
"AND r.rev_text_id = c.old_id AND $fulltext @@ to_tsquery('default','$match')";
## Redirects
if (! $this->showRedirects)
$query .= ' AND page_is_redirect = 0'; ## IS FALSE
## Namespaces - defaults to 0
if ( count($this->namespaces) < 1)
$query .= ' AND page_namespace = 0';
else {
$namespaces = implode( ',', $this->namespaces );
$query .= " AND page_namespace IN ($namespaces)";
}
$query .= " ORDER BY rnk DESC, page_id DESC";
$query .= $this->db->limitResult( '', $this->limit, $this->offset );
return $query;
}
## These two functions are done automatically via triggers
function update( $id, $title, $text ) { return true; }
function updateTitle( $id, $title ) { return true; }
} ## end of the SearchPostgres class
/** @package MediaWiki */
class PostgresSearchResultSet extends SearchResultSet {
function PostgresSearchResultSet( $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 );
}
}
}
?>
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