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https://github.com/YunoHost-Apps/mediawiki_ynh.git
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254 lines
7.3 KiB
PHP
254 lines
7.3 KiB
PHP
<?php
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/**
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* PostgreSQL search engine
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*
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* Copyright © 2006-2007 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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*
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* @file
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* @ingroup Search
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*/
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/**
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* Search engine hook base class for Postgres
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* @ingroup Search
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*/
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class SearchPostgres extends SearchEngine {
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/**
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* @var DatabasePostgres
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*/
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protected $db;
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/**
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* Creates an instance of this class
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* @param $db DatabaseSqlite: database object
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*/
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function __construct( $db ) {
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parent::__construct( $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 (page.page_title) and
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* latest revision article text (pagecontent.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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*/
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function searchTitle( $term ) {
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$q = $this->searchQuery( $term, 'titlevector', 'page_title' );
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$olderror = error_reporting( E_ERROR );
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$resultSet = $this->db->resultObject( $this->db->query( $q, 'SearchPostgres', true ) );
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error_reporting( $olderror );
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if ( !$resultSet ) {
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// Needed for "Query requires full scan, GIN doesn't support it"
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return new SearchResultTooMany();
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}
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return new PostgresSearchResultSet( $resultSet, $this->searchTerms );
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}
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function searchText( $term ) {
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$q = $this->searchQuery( $term, 'textvector', 'old_text' );
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$olderror = error_reporting( E_ERROR );
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$resultSet = $this->db->resultObject( $this->db->query( $q, 'SearchPostgres', true ) );
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error_reporting( $olderror );
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if ( !$resultSet ) {
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return new SearchResultTooMany();
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}
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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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* Returns an SQL fragment consisting of quoted text to search for.
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*
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* @param $term string
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*
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* @return string
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*/
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function parseQuery( $term ) {
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wfDebug( "parseQuery received: $term \n" );
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## No backslashes allowed
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$term = preg_replace( '/\\\/', '', $term );
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## Collapse parens into nearby words:
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$term = preg_replace( '/\s*\(\s*/', ' (', $term );
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$term = preg_replace( '/\s*\)\s*/', ') ', $term );
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## Treat colons as word separators:
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$term = preg_replace( '/:/', ' ', $term );
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$searchstring = '';
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$m = array();
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if ( preg_match_all( '/([-!]?)(\S+)\s*/', $term, $m, PREG_SET_ORDER ) ) {
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foreach ( $m as $terms ) {
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if ( strlen( $terms[1] ) ) {
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$searchstring .= ' & !';
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}
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if ( strtolower( $terms[2] ) === 'and' ) {
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$searchstring .= ' & ';
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}
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elseif ( strtolower( $terms[2] ) === 'or' or $terms[2] === '|' ) {
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$searchstring .= ' | ';
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}
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elseif ( strtolower( $terms[2] ) === 'not' ) {
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$searchstring .= ' & !';
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}
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else {
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$searchstring .= " & $terms[2]";
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}
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}
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}
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## Strip out leading junk
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$searchstring = preg_replace( '/^[\s\&\|]+/', '', $searchstring );
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## Remove any doubled-up operators
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$searchstring = preg_replace( '/([\!\&\|]) +(?:[\&\|] +)+/', "$1 ", $searchstring );
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## Remove any non-spaced operators (e.g. "Zounds!")
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$searchstring = preg_replace( '/([^ ])[\!\&\|]/', "$1", $searchstring );
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## Remove any trailing whitespace or operators
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$searchstring = preg_replace( '/[\s\!\&\|]+$/', '', $searchstring );
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## Remove unnecessary quotes around everything
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$searchstring = preg_replace( '/^[\'"](.*)[\'"]$/', "$1", $searchstring );
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## Quote the whole thing
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$searchstring = $this->db->addQuotes( $searchstring );
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wfDebug( "parseQuery returned: $searchstring \n" );
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return $searchstring;
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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 $term String
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* @param $fulltext String
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* @param $colname
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* @return string
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*/
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function searchQuery( $term, $fulltext, $colname ) {
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# Get the SQL fragment for the given term
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$searchstring = $this->parseQuery( $term );
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## We need a separate query here so gin does not complain about empty searches
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$SQL = "SELECT to_tsquery($searchstring)";
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$res = $this->db->query( $SQL );
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if ( !$res ) {
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## TODO: Better output (example to catch: one 'two)
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die( "Sorry, that was not a valid search string. Please go back and try again" );
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}
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$top = $res->fetchRow();
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$top = $top[0];
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if ( $top === "" ) { ## e.g. if only stopwords are used XXX return something better
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$query = "SELECT page_id, page_namespace, page_title, 0 AS score " .
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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 1=0";
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}
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else {
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$m = array();
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if ( preg_match_all( "/'([^']+)'/", $top, $m, PREG_SET_ORDER ) ) {
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foreach ( $m as $terms ) {
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$this->searchTerms[$terms[1]] = $terms[1];
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}
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}
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$query = "SELECT page_id, page_namespace, page_title, " .
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"ts_rank($fulltext, to_tsquery($searchstring), 5) AS score " .
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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 $fulltext @@ to_tsquery($searchstring)";
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}
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## Redirects
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if ( !$this->showRedirects ) {
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$query .= ' AND page_is_redirect = 0';
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}
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## Namespaces - defaults to 0
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if ( !is_null( $this->namespaces ) ) { // null -> search all
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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 = $this->db->makeList( $this->namespaces );
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$query .= " AND page_namespace IN ($namespaces)";
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}
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}
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$query .= " ORDER BY score DESC, page_id DESC";
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$query .= $this->db->limitResult( '', $this->limit, $this->offset );
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wfDebug( "searchQuery returned: $query \n" );
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return $query;
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}
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## Most of the work of these two functions are done automatically via triggers
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function update( $pageid, $title, $text ) {
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## We don't want to index older revisions
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$SQL = "UPDATE pagecontent SET textvector = NULL WHERE old_id IN " .
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"(SELECT rev_text_id FROM revision WHERE rev_page = " . intval( $pageid ) .
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" ORDER BY rev_text_id DESC OFFSET 1)";
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$this->db->query( $SQL );
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return true;
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}
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function updateTitle( $id, $title ) {
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return true;
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}
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} ## end of the SearchPostgres class
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/**
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* @ingroup Search
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*/
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class PostgresSearchResult extends SearchResult {
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function __construct( $row ) {
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parent::__construct( $row );
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$this->score = $row->score;
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}
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function getScore() {
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return $this->score;
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}
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}
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/**
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* @ingroup Search
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*/
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class PostgresSearchResultSet extends SqlSearchResultSet {
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function __construct( $resultSet, $terms ) {
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parent::__construct( $resultSet, $terms );
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}
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function next() {
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$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 PostgresSearchResult( $row );
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}
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}
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}
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