mirror of
https://github.com/YunoHost-Apps/mediawiki_ynh.git
synced 2024-09-03 19:46:05 +02:00
1519 lines
38 KiB
PHP
1519 lines
38 KiB
PHP
<?php
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/**
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* Basic search engine
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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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* @defgroup Search Search
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*/
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/**
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* Contain a class for special pages
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* @ingroup Search
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*/
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class SearchEngine {
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var $limit = 10;
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var $offset = 0;
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var $prefix = '';
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var $searchTerms = array();
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var $namespaces = array( NS_MAIN );
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var $showRedirects = false;
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/// Feature values
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protected $features = array();
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/**
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* @var DatabaseBase
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*/
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protected $db;
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function __construct( $db = null ) {
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if ( $db ) {
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$this->db = $db;
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} else {
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$this->db = wfGetDB( DB_SLAVE );
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}
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}
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/**
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* Perform a full text search query and return a result set.
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* If title searches are not supported or disabled, return null.
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* STUB
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*
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* @param string $term raw search term
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* @return SearchResultSet|Status|null
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*/
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function searchText( $term ) {
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return null;
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}
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/**
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* Perform a title-only search query and return a result set.
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* If title searches are not supported or disabled, return null.
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* STUB
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*
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* @param string $term raw search term
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* @return SearchResultSet|null
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*/
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function searchTitle( $term ) {
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return null;
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}
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/**
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* If this search backend can list/unlist redirects
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* @deprecated since 1.18 Call supports( 'list-redirects' );
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* @return bool
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*/
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function acceptListRedirects() {
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wfDeprecated( __METHOD__, '1.18' );
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return $this->supports( 'list-redirects' );
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}
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/**
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* @since 1.18
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* @param $feature String
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* @return Boolean
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*/
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public function supports( $feature ) {
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switch ( $feature ) {
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case 'list-redirects':
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case 'search-update':
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return true;
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case 'title-suffix-filter':
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default:
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return false;
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}
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}
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/**
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* Way to pass custom data for engines
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* @since 1.18
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* @param $feature String
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* @param $data Mixed
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* @return bool
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*/
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public function setFeatureData( $feature, $data ) {
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$this->features[$feature] = $data;
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}
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/**
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* When overridden in derived class, performs database-specific conversions
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* on text to be used for searching or updating search index.
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* Default implementation does nothing (simply returns $string).
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*
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* @param string $string String to process
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* @return string
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*/
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public function normalizeText( $string ) {
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global $wgContLang;
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// Some languages such as Chinese require word segmentation
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return $wgContLang->segmentByWord( $string );
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}
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/**
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* Transform search term in cases when parts of the query came as different GET params (when supported)
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* e.g. for prefix queries: search=test&prefix=Main_Page/Archive -> test prefix:Main Page/Archive
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*/
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function transformSearchTerm( $term ) {
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return $term;
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}
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/**
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* If an exact title match can be found, or a very slightly close match,
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* return the title. If no match, returns NULL.
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*
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* @param $searchterm String
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* @return Title
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*/
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public static function getNearMatch( $searchterm ) {
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$title = self::getNearMatchInternal( $searchterm );
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wfRunHooks( 'SearchGetNearMatchComplete', array( $searchterm, &$title ) );
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return $title;
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}
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/**
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* Do a near match (see SearchEngine::getNearMatch) and wrap it into a
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* SearchResultSet.
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*
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* @param $searchterm string
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* @return SearchResultSet
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*/
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public static function getNearMatchResultSet( $searchterm ) {
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return new SearchNearMatchResultSet( self::getNearMatch( $searchterm ) );
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}
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/**
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* Really find the title match.
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* @return null|Title
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*/
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private static function getNearMatchInternal( $searchterm ) {
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global $wgContLang, $wgEnableSearchContributorsByIP;
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$allSearchTerms = array( $searchterm );
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if ( $wgContLang->hasVariants() ) {
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$allSearchTerms = array_merge( $allSearchTerms, $wgContLang->autoConvertToAllVariants( $searchterm ) );
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}
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$titleResult = null;
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if ( !wfRunHooks( 'SearchGetNearMatchBefore', array( $allSearchTerms, &$titleResult ) ) ) {
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return $titleResult;
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}
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foreach ( $allSearchTerms as $term ) {
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# Exact match? No need to look further.
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$title = Title::newFromText( $term );
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if ( is_null( $title ) ) {
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return null;
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}
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# Try files if searching in the Media: namespace
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if ( $title->getNamespace() == NS_MEDIA ) {
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$title = Title::makeTitle( NS_FILE, $title->getText() );
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}
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if ( $title->isSpecialPage() || $title->isExternal() || $title->exists() ) {
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return $title;
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}
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# See if it still otherwise has content is some sane sense
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$page = WikiPage::factory( $title );
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if ( $page->hasViewableContent() ) {
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return $title;
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}
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if ( !wfRunHooks( 'SearchAfterNoDirectMatch', array( $term, &$title ) ) ) {
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return $title;
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}
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# Now try all lower case (i.e. first letter capitalized)
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$title = Title::newFromText( $wgContLang->lc( $term ) );
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if ( $title && $title->exists() ) {
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return $title;
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}
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# Now try capitalized string
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$title = Title::newFromText( $wgContLang->ucwords( $term ) );
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if ( $title && $title->exists() ) {
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return $title;
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}
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# Now try all upper case
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$title = Title::newFromText( $wgContLang->uc( $term ) );
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if ( $title && $title->exists() ) {
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return $title;
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}
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# Now try Word-Caps-Breaking-At-Word-Breaks, for hyphenated names etc
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$title = Title::newFromText( $wgContLang->ucwordbreaks( $term ) );
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if ( $title && $title->exists() ) {
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return $title;
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}
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// Give hooks a chance at better match variants
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$title = null;
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if ( !wfRunHooks( 'SearchGetNearMatch', array( $term, &$title ) ) ) {
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return $title;
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}
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}
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$title = Title::newFromText( $searchterm );
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# Entering an IP address goes to the contributions page
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if ( $wgEnableSearchContributorsByIP ) {
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if ( ( $title->getNamespace() == NS_USER && User::isIP( $title->getText() ) )
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|| User::isIP( trim( $searchterm ) ) ) {
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return SpecialPage::getTitleFor( 'Contributions', $title->getDBkey() );
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}
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}
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# Entering a user goes to the user page whether it's there or not
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if ( $title->getNamespace() == NS_USER ) {
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return $title;
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}
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# Go to images that exist even if there's no local page.
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# There may have been a funny upload, or it may be on a shared
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# file repository such as Wikimedia Commons.
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if ( $title->getNamespace() == NS_FILE ) {
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$image = wfFindFile( $title );
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if ( $image ) {
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return $title;
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}
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}
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# MediaWiki namespace? Page may be "implied" if not customized.
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# Just return it, with caps forced as the message system likes it.
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if ( $title->getNamespace() == NS_MEDIAWIKI ) {
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return Title::makeTitle( NS_MEDIAWIKI, $wgContLang->ucfirst( $title->getText() ) );
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}
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# Quoted term? Try without the quotes...
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$matches = array();
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if ( preg_match( '/^"([^"]+)"$/', $searchterm, $matches ) ) {
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return SearchEngine::getNearMatch( $matches[1] );
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}
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return null;
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}
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public static function legalSearchChars() {
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return "A-Za-z_'.0-9\\x80-\\xFF\\-";
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}
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/**
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* Set the maximum number of results to return
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* and how many to skip before returning the first.
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*
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* @param $limit Integer
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* @param $offset Integer
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*/
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function setLimitOffset( $limit, $offset = 0 ) {
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$this->limit = intval( $limit );
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$this->offset = intval( $offset );
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}
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/**
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* Set which namespaces the search should include.
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* Give an array of namespace index numbers.
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*
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* @param $namespaces Array
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*/
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function setNamespaces( $namespaces ) {
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$this->namespaces = $namespaces;
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}
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/**
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* Parse some common prefixes: all (search everything)
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* or namespace names
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*
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* @param $query String
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* @return string
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*/
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function replacePrefixes( $query ) {
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global $wgContLang;
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$parsed = $query;
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if ( strpos( $query, ':' ) === false ) { // nothing to do
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wfRunHooks( 'SearchEngineReplacePrefixesComplete', array( $this, $query, &$parsed ) );
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return $parsed;
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}
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$allkeyword = wfMessage( 'searchall' )->inContentLanguage()->text() . ":";
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if ( strncmp( $query, $allkeyword, strlen( $allkeyword ) ) == 0 ) {
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$this->namespaces = null;
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$parsed = substr( $query, strlen( $allkeyword ) );
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} elseif ( strpos( $query, ':' ) !== false ) {
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$prefix = substr( $query, 0, strpos( $query, ':' ) );
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$index = $wgContLang->getNsIndex( $prefix );
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if ( $index !== false ) {
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$this->namespaces = array( $index );
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$parsed = substr( $query, strlen( $prefix ) + 1 );
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}
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}
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if ( trim( $parsed ) == '' ) {
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$parsed = $query; // prefix was the whole query
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}
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wfRunHooks( 'SearchEngineReplacePrefixesComplete', array( $this, $query, &$parsed ) );
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return $parsed;
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}
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/**
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* Make a list of searchable namespaces and their canonical names.
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* @return Array
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*/
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public static function searchableNamespaces() {
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global $wgContLang;
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$arr = array();
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foreach ( $wgContLang->getNamespaces() as $ns => $name ) {
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if ( $ns >= NS_MAIN ) {
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$arr[$ns] = $name;
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}
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}
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wfRunHooks( 'SearchableNamespaces', array( &$arr ) );
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return $arr;
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}
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/**
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* Extract default namespaces to search from the given user's
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* settings, returning a list of index numbers.
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*
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* @param $user User
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* @return Array
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*/
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public static function userNamespaces( $user ) {
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global $wgSearchEverythingOnlyLoggedIn;
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$searchableNamespaces = SearchEngine::searchableNamespaces();
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// get search everything preference, that can be set to be read for logged-in users
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// it overrides other options
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if ( !$wgSearchEverythingOnlyLoggedIn || $user->isLoggedIn() ) {
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if ( $user->getOption( 'searcheverything' ) ) {
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return array_keys( $searchableNamespaces );
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}
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}
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$arr = array();
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foreach ( $searchableNamespaces as $ns => $name ) {
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if ( $user->getOption( 'searchNs' . $ns ) ) {
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$arr[] = $ns;
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}
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}
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return $arr;
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}
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/**
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* Find snippet highlight settings for all users
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*
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* @return Array contextlines, contextchars
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*/
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public static function userHighlightPrefs() {
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$contextlines = 2; // Hardcode this. Old defaults sucked. :)
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$contextchars = 75; // same as above.... :P
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return array( $contextlines, $contextchars );
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}
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/**
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* An array of namespaces indexes to be searched by default
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*
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* @return Array
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*/
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public static function defaultNamespaces() {
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global $wgNamespacesToBeSearchedDefault;
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return array_keys( $wgNamespacesToBeSearchedDefault, true );
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}
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/**
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* Get a list of namespace names useful for showing in tooltips
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* and preferences
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*
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* @param $namespaces Array
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* @return array
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*/
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public static function namespacesAsText( $namespaces ) {
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global $wgContLang;
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$formatted = array_map( array( $wgContLang, 'getFormattedNsText' ), $namespaces );
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foreach ( $formatted as $key => $ns ) {
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if ( empty( $ns ) ) {
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$formatted[$key] = wfMessage( 'blanknamespace' )->text();
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}
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}
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return $formatted;
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}
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/**
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* Return the help namespaces to be shown on Special:Search
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*
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* @return Array
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*/
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public static function helpNamespaces() {
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global $wgNamespacesToBeSearchedHelp;
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return array_keys( $wgNamespacesToBeSearchedHelp, true );
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}
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/**
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* Return a 'cleaned up' search string
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*
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* @param $text String
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* @return String
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*/
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function filter( $text ) {
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$lc = $this->legalSearchChars();
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return trim( preg_replace( "/[^{$lc}]/", " ", $text ) );
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}
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/**
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* Load up the appropriate search engine class for the currently
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* active database backend, and return a configured instance.
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*
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* @param String $type Type of search backend, if not the default
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* @return SearchEngine
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*/
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public static function create( $type = null ) {
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global $wgSearchType;
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$dbr = null;
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$alternatives = self::getSearchTypes();
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if ( $type && in_array( $type, $alternatives ) ) {
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$class = $type;
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} elseif ( $wgSearchType !== null ) {
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$class = $wgSearchType;
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} else {
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$dbr = wfGetDB( DB_SLAVE );
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$class = $dbr->getSearchEngine();
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}
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$search = new $class( $dbr );
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$search->setLimitOffset( 0, 0 );
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return $search;
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}
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/**
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* Return the search engines we support. If only $wgSearchType
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* is set, it'll be an array of just that one item.
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*
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* @return array
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*/
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public static function getSearchTypes() {
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global $wgSearchType, $wgSearchTypeAlternatives;
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static $alternatives = null;
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if ( $alternatives === null ) {
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$alternatives = $wgSearchTypeAlternatives ?: array();
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array_unshift( $alternatives, $wgSearchType );
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}
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return $alternatives;
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}
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/**
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* Create or update the search index record for the given page.
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* Title and text should be pre-processed.
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* STUB
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*
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* @param $id Integer
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* @param $title String
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* @param $text String
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*/
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function update( $id, $title, $text ) {
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// no-op
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}
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/**
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* Update a search index record's title only.
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* Title should be pre-processed.
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* STUB
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*
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* @param $id Integer
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* @param $title String
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*/
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function updateTitle( $id, $title ) {
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// no-op
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}
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/**
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* Delete an indexed page
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* Title should be pre-processed.
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* STUB
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*
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* @param Integer $id Page id that was deleted
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* @param String $title Title of page that was deleted
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*/
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function delete( $id, $title ) {
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// no-op
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}
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/**
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* Get OpenSearch suggestion template
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*
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* @return String
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*/
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public static function getOpenSearchTemplate() {
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global $wgOpenSearchTemplate, $wgCanonicalServer;
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if ( $wgOpenSearchTemplate ) {
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return $wgOpenSearchTemplate;
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} else {
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$ns = implode( '|', SearchEngine::defaultNamespaces() );
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if ( !$ns ) {
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$ns = "0";
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}
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return $wgCanonicalServer . wfScript( 'api' ) . '?action=opensearch&search={searchTerms}&namespace=' . $ns;
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}
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}
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/**
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* Get the raw text for updating the index from a content object
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* Nicer search backends could possibly do something cooler than
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* just returning raw text
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*
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* @todo This isn't ideal, we'd really like to have content-specific handling here
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* @param Title $t Title we're indexing
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* @param Content $c Content of the page to index
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* @return string
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*/
|
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public function getTextFromContent( Title $t, Content $c = null ) {
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return $c ? $c->getTextForSearchIndex() : '';
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}
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|
/**
|
|
* If an implementation of SearchEngine handles all of its own text processing
|
|
* in getTextFromContent() and doesn't require SearchUpdate::updateText()'s
|
|
* rather silly handling, it should return true here instead.
|
|
*
|
|
* @return bool
|
|
*/
|
|
public function textAlreadyUpdatedForIndex() {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @ingroup Search
|
|
*/
|
|
class SearchResultSet {
|
|
/**
|
|
* Fetch an array of regular expression fragments for matching
|
|
* the search terms as parsed by this engine in a text extract.
|
|
* STUB
|
|
*
|
|
* @return Array
|
|
*/
|
|
function termMatches() {
|
|
return array();
|
|
}
|
|
|
|
function numRows() {
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Return true if results are included in this result set.
|
|
* STUB
|
|
*
|
|
* @return Boolean
|
|
*/
|
|
function hasResults() {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Some search modes return a total hit count for the query
|
|
* in the entire article database. This may include pages
|
|
* in namespaces that would not be matched on the given
|
|
* settings.
|
|
*
|
|
* Return null if no total hits number is supported.
|
|
*
|
|
* @return Integer
|
|
*/
|
|
function getTotalHits() {
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Some search modes return a suggested alternate term if there are
|
|
* no exact hits. Returns true if there is one on this set.
|
|
*
|
|
* @return Boolean
|
|
*/
|
|
function hasSuggestion() {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @return String: suggested query, null if none
|
|
*/
|
|
function getSuggestionQuery() {
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* @return String: HTML highlighted suggested query, '' if none
|
|
*/
|
|
function getSuggestionSnippet() {
|
|
return '';
|
|
}
|
|
|
|
/**
|
|
* Return information about how and from where the results were fetched,
|
|
* should be useful for diagnostics and debugging
|
|
*
|
|
* @return String
|
|
*/
|
|
function getInfo() {
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Return a result set of hits on other (multiple) wikis associated with this one
|
|
*
|
|
* @return SearchResultSet
|
|
*/
|
|
function getInterwikiResults() {
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Check if there are results on other wikis
|
|
*
|
|
* @return Boolean
|
|
*/
|
|
function hasInterwikiResults() {
|
|
return $this->getInterwikiResults() != null;
|
|
}
|
|
|
|
/**
|
|
* Fetches next search result, or false.
|
|
* STUB
|
|
*
|
|
* @return SearchResult
|
|
*/
|
|
function next() {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Frees the result set, if applicable.
|
|
*/
|
|
function free() {
|
|
// ...
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This class is used for different SQL-based search engines shipped with MediaWiki
|
|
*/
|
|
class SqlSearchResultSet extends SearchResultSet {
|
|
|
|
protected $mResultSet;
|
|
|
|
function __construct( $resultSet, $terms ) {
|
|
$this->mResultSet = $resultSet;
|
|
$this->mTerms = $terms;
|
|
}
|
|
|
|
function termMatches() {
|
|
return $this->mTerms;
|
|
}
|
|
|
|
function numRows() {
|
|
if ( $this->mResultSet === false ) {
|
|
return false;
|
|
}
|
|
|
|
return $this->mResultSet->numRows();
|
|
}
|
|
|
|
function next() {
|
|
if ( $this->mResultSet === false ) {
|
|
return false;
|
|
}
|
|
|
|
$row = $this->mResultSet->fetchObject();
|
|
if ( $row === false ) {
|
|
return false;
|
|
}
|
|
|
|
return SearchResult::newFromRow( $row );
|
|
}
|
|
|
|
function free() {
|
|
if ( $this->mResultSet === false ) {
|
|
return false;
|
|
}
|
|
|
|
$this->mResultSet->free();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @ingroup Search
|
|
*/
|
|
class SearchResultTooMany {
|
|
# # Some search engines may bail out if too many matches are found
|
|
}
|
|
|
|
/**
|
|
* @todo FIXME: This class is horribly factored. It would probably be better to
|
|
* have a useful base class to which you pass some standard information, then
|
|
* let the fancy self-highlighters extend that.
|
|
* @ingroup Search
|
|
*/
|
|
class SearchResult {
|
|
|
|
/**
|
|
* @var Revision
|
|
*/
|
|
var $mRevision = null;
|
|
var $mImage = null;
|
|
|
|
/**
|
|
* @var Title
|
|
*/
|
|
var $mTitle;
|
|
|
|
/**
|
|
* @var String
|
|
*/
|
|
var $mText;
|
|
|
|
/**
|
|
* Return a new SearchResult and initializes it with a title.
|
|
*
|
|
* @param $title Title
|
|
* @return SearchResult
|
|
*/
|
|
public static function newFromTitle( $title ) {
|
|
$result = new self();
|
|
$result->initFromTitle( $title );
|
|
return $result;
|
|
}
|
|
/**
|
|
* Return a new SearchResult and initializes it with a row.
|
|
*
|
|
* @param $row object
|
|
* @return SearchResult
|
|
*/
|
|
public static function newFromRow( $row ) {
|
|
$result = new self();
|
|
$result->initFromRow( $row );
|
|
return $result;
|
|
}
|
|
|
|
public function __construct( $row = null ) {
|
|
if ( !is_null( $row ) ) {
|
|
// Backwards compatibility with pre-1.17 callers
|
|
$this->initFromRow( $row );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Initialize from a database row. Makes a Title and passes that to
|
|
* initFromTitle.
|
|
*
|
|
* @param $row object
|
|
*/
|
|
protected function initFromRow( $row ) {
|
|
$this->initFromTitle( Title::makeTitle( $row->page_namespace, $row->page_title ) );
|
|
}
|
|
|
|
/**
|
|
* Initialize from a Title and if possible initializes a corresponding
|
|
* Revision and File.
|
|
*
|
|
* @param $title Title
|
|
*/
|
|
protected function initFromTitle( $title ) {
|
|
$this->mTitle = $title;
|
|
if ( !is_null( $this->mTitle ) ) {
|
|
$id = false;
|
|
wfRunHooks( 'SearchResultInitFromTitle', array( $title, &$id ) );
|
|
$this->mRevision = Revision::newFromTitle(
|
|
$this->mTitle, $id, Revision::READ_NORMAL );
|
|
if ( $this->mTitle->getNamespace() === NS_FILE ) {
|
|
$this->mImage = wfFindFile( $this->mTitle );
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if this is result points to an invalid title
|
|
*
|
|
* @return Boolean
|
|
*/
|
|
function isBrokenTitle() {
|
|
if ( is_null( $this->mTitle ) ) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Check if target page is missing, happens when index is out of date
|
|
*
|
|
* @return Boolean
|
|
*/
|
|
function isMissingRevision() {
|
|
return !$this->mRevision && !$this->mImage;
|
|
}
|
|
|
|
/**
|
|
* @return Title
|
|
*/
|
|
function getTitle() {
|
|
return $this->mTitle;
|
|
}
|
|
|
|
/**
|
|
* @return float|null if not supported
|
|
*/
|
|
function getScore() {
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Lazy initialization of article text from DB
|
|
*/
|
|
protected function initText() {
|
|
if ( !isset( $this->mText ) ) {
|
|
if ( $this->mRevision != null ) {
|
|
$this->mText = SearchEngine::create()
|
|
->getTextFromContent( $this->mTitle, $this->mRevision->getContent() );
|
|
} else { // TODO: can we fetch raw wikitext for commons images?
|
|
$this->mText = '';
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param array $terms terms to highlight
|
|
* @return String: highlighted text snippet, null (and not '') if not supported
|
|
*/
|
|
function getTextSnippet( $terms ) {
|
|
global $wgAdvancedSearchHighlighting;
|
|
$this->initText();
|
|
|
|
// TODO: make highliter take a content object. Make ContentHandler a factory for SearchHighliter.
|
|
list( $contextlines, $contextchars ) = SearchEngine::userHighlightPrefs();
|
|
$h = new SearchHighlighter();
|
|
if ( $wgAdvancedSearchHighlighting ) {
|
|
return $h->highlightText( $this->mText, $terms, $contextlines, $contextchars );
|
|
} else {
|
|
return $h->highlightSimple( $this->mText, $terms, $contextlines, $contextchars );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param array $terms terms to highlight
|
|
* @return String: highlighted title, '' if not supported
|
|
*/
|
|
function getTitleSnippet( $terms ) {
|
|
return '';
|
|
}
|
|
|
|
/**
|
|
* @param array $terms terms to highlight
|
|
* @return String: highlighted redirect name (redirect to this page), '' if none or not supported
|
|
*/
|
|
function getRedirectSnippet( $terms ) {
|
|
return '';
|
|
}
|
|
|
|
/**
|
|
* @return Title object for the redirect to this page, null if none or not supported
|
|
*/
|
|
function getRedirectTitle() {
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* @return string highlighted relevant section name, null if none or not supported
|
|
*/
|
|
function getSectionSnippet() {
|
|
return '';
|
|
}
|
|
|
|
/**
|
|
* @return Title object (pagename+fragment) for the section, null if none or not supported
|
|
*/
|
|
function getSectionTitle() {
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* @return String: timestamp
|
|
*/
|
|
function getTimestamp() {
|
|
if ( $this->mRevision ) {
|
|
return $this->mRevision->getTimestamp();
|
|
} elseif ( $this->mImage ) {
|
|
return $this->mImage->getTimestamp();
|
|
}
|
|
return '';
|
|
}
|
|
|
|
/**
|
|
* @return Integer: number of words
|
|
*/
|
|
function getWordCount() {
|
|
$this->initText();
|
|
return str_word_count( $this->mText );
|
|
}
|
|
|
|
/**
|
|
* @return Integer: size in bytes
|
|
*/
|
|
function getByteSize() {
|
|
$this->initText();
|
|
return strlen( $this->mText );
|
|
}
|
|
|
|
/**
|
|
* @return Boolean if hit has related articles
|
|
*/
|
|
function hasRelated() {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @return String: interwiki prefix of the title (return iw even if title is broken)
|
|
*/
|
|
function getInterwikiPrefix() {
|
|
return '';
|
|
}
|
|
}
|
|
/**
|
|
* A SearchResultSet wrapper for SearchEngine::getNearMatch
|
|
*/
|
|
class SearchNearMatchResultSet extends SearchResultSet {
|
|
private $fetched = false;
|
|
/**
|
|
* @param $match mixed Title if matched, else null
|
|
*/
|
|
public function __construct( $match ) {
|
|
$this->result = $match;
|
|
}
|
|
public function hasResult() {
|
|
return (bool)$this->result;
|
|
}
|
|
public function numRows() {
|
|
return $this->hasResults() ? 1 : 0;
|
|
}
|
|
public function next() {
|
|
if ( $this->fetched || !$this->result ) {
|
|
return false;
|
|
}
|
|
$this->fetched = true;
|
|
return SearchResult::newFromTitle( $this->result );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Highlight bits of wikitext
|
|
*
|
|
* @ingroup Search
|
|
*/
|
|
class SearchHighlighter {
|
|
var $mCleanWikitext = true;
|
|
|
|
function __construct( $cleanupWikitext = true ) {
|
|
$this->mCleanWikitext = $cleanupWikitext;
|
|
}
|
|
|
|
/**
|
|
* Default implementation of wikitext highlighting
|
|
*
|
|
* @param $text String
|
|
* @param array $terms terms to highlight (unescaped)
|
|
* @param $contextlines Integer
|
|
* @param $contextchars Integer
|
|
* @return String
|
|
*/
|
|
public function highlightText( $text, $terms, $contextlines, $contextchars ) {
|
|
global $wgContLang;
|
|
global $wgSearchHighlightBoundaries;
|
|
$fname = __METHOD__;
|
|
|
|
if ( $text == '' ) {
|
|
return '';
|
|
}
|
|
|
|
// spli text into text + templates/links/tables
|
|
$spat = "/(\\{\\{)|(\\[\\[[^\\]:]+:)|(\n\\{\\|)";
|
|
// first capture group is for detecting nested templates/links/tables/references
|
|
$endPatterns = array(
|
|
1 => '/(\{\{)|(\}\})/', // template
|
|
2 => '/(\[\[)|(\]\])/', // image
|
|
3 => "/(\n\\{\\|)|(\n\\|\\})/" ); // table
|
|
|
|
// @todo FIXME: This should prolly be a hook or something
|
|
if ( function_exists( 'wfCite' ) ) {
|
|
$spat .= '|(<ref>)'; // references via cite extension
|
|
$endPatterns[4] = '/(<ref>)|(<\/ref>)/';
|
|
}
|
|
$spat .= '/';
|
|
$textExt = array(); // text extracts
|
|
$otherExt = array(); // other extracts
|
|
wfProfileIn( "$fname-split" );
|
|
$start = 0;
|
|
$textLen = strlen( $text );
|
|
$count = 0; // sequence number to maintain ordering
|
|
while ( $start < $textLen ) {
|
|
// find start of template/image/table
|
|
if ( preg_match( $spat, $text, $matches, PREG_OFFSET_CAPTURE, $start ) ) {
|
|
$epat = '';
|
|
foreach ( $matches as $key => $val ) {
|
|
if ( $key > 0 && $val[1] != - 1 ) {
|
|
if ( $key == 2 ) {
|
|
// see if this is an image link
|
|
$ns = substr( $val[0], 2, - 1 );
|
|
if ( $wgContLang->getNsIndex( $ns ) != NS_FILE ) {
|
|
break;
|
|
}
|
|
|
|
}
|
|
$epat = $endPatterns[$key];
|
|
$this->splitAndAdd( $textExt, $count, substr( $text, $start, $val[1] - $start ) );
|
|
$start = $val[1];
|
|
break;
|
|
}
|
|
}
|
|
if ( $epat ) {
|
|
// find end (and detect any nested elements)
|
|
$level = 0;
|
|
$offset = $start + 1;
|
|
$found = false;
|
|
while ( preg_match( $epat, $text, $endMatches, PREG_OFFSET_CAPTURE, $offset ) ) {
|
|
if ( array_key_exists( 2, $endMatches ) ) {
|
|
// found end
|
|
if ( $level == 0 ) {
|
|
$len = strlen( $endMatches[2][0] );
|
|
$off = $endMatches[2][1];
|
|
$this->splitAndAdd( $otherExt, $count,
|
|
substr( $text, $start, $off + $len - $start ) );
|
|
$start = $off + $len;
|
|
$found = true;
|
|
break;
|
|
} else {
|
|
// end of nested element
|
|
$level -= 1;
|
|
}
|
|
} else {
|
|
// nested
|
|
$level += 1;
|
|
}
|
|
$offset = $endMatches[0][1] + strlen( $endMatches[0][0] );
|
|
}
|
|
if ( ! $found ) {
|
|
// couldn't find appropriate closing tag, skip
|
|
$this->splitAndAdd( $textExt, $count, substr( $text, $start, strlen( $matches[0][0] ) ) );
|
|
$start += strlen( $matches[0][0] );
|
|
}
|
|
continue;
|
|
}
|
|
}
|
|
// else: add as text extract
|
|
$this->splitAndAdd( $textExt, $count, substr( $text, $start ) );
|
|
break;
|
|
}
|
|
|
|
$all = $textExt + $otherExt; // these have disjunct key sets
|
|
|
|
wfProfileOut( "$fname-split" );
|
|
|
|
// prepare regexps
|
|
foreach ( $terms as $index => $term ) {
|
|
// manually do upper/lowercase stuff for utf-8 since PHP won't do it
|
|
if ( preg_match( '/[\x80-\xff]/', $term ) ) {
|
|
$terms[$index] = preg_replace_callback( '/./us', array( $this, 'caseCallback' ), $terms[$index] );
|
|
} else {
|
|
$terms[$index] = $term;
|
|
}
|
|
}
|
|
$anyterm = implode( '|', $terms );
|
|
$phrase = implode( "$wgSearchHighlightBoundaries+", $terms );
|
|
|
|
// @todo FIXME: A hack to scale contextchars, a correct solution
|
|
// would be to have contextchars actually be char and not byte
|
|
// length, and do proper utf-8 substrings and lengths everywhere,
|
|
// but PHP is making that very hard and unclean to implement :(
|
|
$scale = strlen( $anyterm ) / mb_strlen( $anyterm );
|
|
$contextchars = intval( $contextchars * $scale );
|
|
|
|
$patPre = "(^|$wgSearchHighlightBoundaries)";
|
|
$patPost = "($wgSearchHighlightBoundaries|$)";
|
|
|
|
$pat1 = "/(" . $phrase . ")/ui";
|
|
$pat2 = "/$patPre(" . $anyterm . ")$patPost/ui";
|
|
|
|
wfProfileIn( "$fname-extract" );
|
|
|
|
$left = $contextlines;
|
|
|
|
$snippets = array();
|
|
$offsets = array();
|
|
|
|
// show beginning only if it contains all words
|
|
$first = 0;
|
|
$firstText = '';
|
|
foreach ( $textExt as $index => $line ) {
|
|
if ( strlen( $line ) > 0 && $line[0] != ';' && $line[0] != ':' ) {
|
|
$firstText = $this->extract( $line, 0, $contextchars * $contextlines );
|
|
$first = $index;
|
|
break;
|
|
}
|
|
}
|
|
if ( $firstText ) {
|
|
$succ = true;
|
|
// check if first text contains all terms
|
|
foreach ( $terms as $term ) {
|
|
if ( ! preg_match( "/$patPre" . $term . "$patPost/ui", $firstText ) ) {
|
|
$succ = false;
|
|
break;
|
|
}
|
|
}
|
|
if ( $succ ) {
|
|
$snippets[$first] = $firstText;
|
|
$offsets[$first] = 0;
|
|
}
|
|
}
|
|
if ( ! $snippets ) {
|
|
// match whole query on text
|
|
$this->process( $pat1, $textExt, $left, $contextchars, $snippets, $offsets );
|
|
// match whole query on templates/tables/images
|
|
$this->process( $pat1, $otherExt, $left, $contextchars, $snippets, $offsets );
|
|
// match any words on text
|
|
$this->process( $pat2, $textExt, $left, $contextchars, $snippets, $offsets );
|
|
// match any words on templates/tables/images
|
|
$this->process( $pat2, $otherExt, $left, $contextchars, $snippets, $offsets );
|
|
|
|
ksort( $snippets );
|
|
}
|
|
|
|
// add extra chars to each snippet to make snippets constant size
|
|
$extended = array();
|
|
if ( count( $snippets ) == 0 ) {
|
|
// couldn't find the target words, just show beginning of article
|
|
if ( array_key_exists( $first, $all ) ) {
|
|
$targetchars = $contextchars * $contextlines;
|
|
$snippets[$first] = '';
|
|
$offsets[$first] = 0;
|
|
}
|
|
} else {
|
|
// if begin of the article contains the whole phrase, show only that !!
|
|
if ( array_key_exists( $first, $snippets ) && preg_match( $pat1, $snippets[$first] )
|
|
&& $offsets[$first] < $contextchars * 2 ) {
|
|
$snippets = array( $first => $snippets[$first] );
|
|
}
|
|
|
|
// calc by how much to extend existing snippets
|
|
$targetchars = intval( ( $contextchars * $contextlines ) / count ( $snippets ) );
|
|
}
|
|
|
|
foreach ( $snippets as $index => $line ) {
|
|
$extended[$index] = $line;
|
|
$len = strlen( $line );
|
|
if ( $len < $targetchars - 20 ) {
|
|
// complete this line
|
|
if ( $len < strlen( $all[$index] ) ) {
|
|
$extended[$index] = $this->extract( $all[$index], $offsets[$index], $offsets[$index] + $targetchars, $offsets[$index] );
|
|
$len = strlen( $extended[$index] );
|
|
}
|
|
|
|
// add more lines
|
|
$add = $index + 1;
|
|
while ( $len < $targetchars - 20
|
|
&& array_key_exists( $add, $all )
|
|
&& !array_key_exists( $add, $snippets ) ) {
|
|
$offsets[$add] = 0;
|
|
$tt = "\n" . $this->extract( $all[$add], 0, $targetchars - $len, $offsets[$add] );
|
|
$extended[$add] = $tt;
|
|
$len += strlen( $tt );
|
|
$add++;
|
|
}
|
|
}
|
|
}
|
|
|
|
// $snippets = array_map( 'htmlspecialchars', $extended );
|
|
$snippets = $extended;
|
|
$last = - 1;
|
|
$extract = '';
|
|
foreach ( $snippets as $index => $line ) {
|
|
if ( $last == - 1 ) {
|
|
$extract .= $line; // first line
|
|
} elseif ( $last + 1 == $index && $offsets[$last] + strlen( $snippets[$last] ) >= strlen( $all[$last] ) ) {
|
|
$extract .= " " . $line; // continous lines
|
|
} else {
|
|
$extract .= '<b> ... </b>' . $line;
|
|
}
|
|
|
|
$last = $index;
|
|
}
|
|
if ( $extract ) {
|
|
$extract .= '<b> ... </b>';
|
|
}
|
|
|
|
$processed = array();
|
|
foreach ( $terms as $term ) {
|
|
if ( ! isset( $processed[$term] ) ) {
|
|
$pat3 = "/$patPre(" . $term . ")$patPost/ui"; // highlight word
|
|
$extract = preg_replace( $pat3,
|
|
"\\1<span class='searchmatch'>\\2</span>\\3", $extract );
|
|
$processed[$term] = true;
|
|
}
|
|
}
|
|
|
|
wfProfileOut( "$fname-extract" );
|
|
|
|
return $extract;
|
|
}
|
|
|
|
/**
|
|
* Split text into lines and add it to extracts array
|
|
*
|
|
* @param array $extracts index -> $line
|
|
* @param $count Integer
|
|
* @param $text String
|
|
*/
|
|
function splitAndAdd( &$extracts, &$count, $text ) {
|
|
$split = explode( "\n", $this->mCleanWikitext ? $this->removeWiki( $text ) : $text );
|
|
foreach ( $split as $line ) {
|
|
$tt = trim( $line );
|
|
if ( $tt ) {
|
|
$extracts[$count++] = $tt;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Do manual case conversion for non-ascii chars
|
|
*
|
|
* @param $matches Array
|
|
* @return string
|
|
*/
|
|
function caseCallback( $matches ) {
|
|
global $wgContLang;
|
|
if ( strlen( $matches[0] ) > 1 ) {
|
|
return '[' . $wgContLang->lc( $matches[0] ) . $wgContLang->uc( $matches[0] ) . ']';
|
|
} else {
|
|
return $matches[0];
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Extract part of the text from start to end, but by
|
|
* not chopping up words
|
|
* @param $text String
|
|
* @param $start Integer
|
|
* @param $end Integer
|
|
* @param $posStart Integer: (out) actual start position
|
|
* @param $posEnd Integer: (out) actual end position
|
|
* @return String
|
|
*/
|
|
function extract( $text, $start, $end, &$posStart = null, &$posEnd = null ) {
|
|
if ( $start != 0 ) {
|
|
$start = $this->position( $text, $start, 1 );
|
|
}
|
|
if ( $end >= strlen( $text ) ) {
|
|
$end = strlen( $text );
|
|
} else {
|
|
$end = $this->position( $text, $end );
|
|
}
|
|
|
|
if ( !is_null( $posStart ) ) {
|
|
$posStart = $start;
|
|
}
|
|
if ( !is_null( $posEnd ) ) {
|
|
$posEnd = $end;
|
|
}
|
|
|
|
if ( $end > $start ) {
|
|
return substr( $text, $start, $end - $start );
|
|
} else {
|
|
return '';
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Find a nonletter near a point (index) in the text
|
|
*
|
|
* @param $text String
|
|
* @param $point Integer
|
|
* @param $offset Integer: offset to found index
|
|
* @return Integer: nearest nonletter index, or beginning of utf8 char if none
|
|
*/
|
|
function position( $text, $point, $offset = 0 ) {
|
|
$tolerance = 10;
|
|
$s = max( 0, $point - $tolerance );
|
|
$l = min( strlen( $text ), $point + $tolerance ) - $s;
|
|
$m = array();
|
|
if ( preg_match( '/[ ,.!?~!@#$%^&*\(\)+=\-\\\|\[\]"\'<>]/', substr( $text, $s, $l ), $m, PREG_OFFSET_CAPTURE ) ) {
|
|
return $m[0][1] + $s + $offset;
|
|
} else {
|
|
// check if point is on a valid first UTF8 char
|
|
$char = ord( $text[$point] );
|
|
while ( $char >= 0x80 && $char < 0xc0 ) {
|
|
// skip trailing bytes
|
|
$point++;
|
|
if ( $point >= strlen( $text ) ) {
|
|
return strlen( $text );
|
|
}
|
|
$char = ord( $text[$point] );
|
|
}
|
|
return $point;
|
|
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Search extracts for a pattern, and return snippets
|
|
*
|
|
* @param string $pattern regexp for matching lines
|
|
* @param array $extracts extracts to search
|
|
* @param $linesleft Integer: number of extracts to make
|
|
* @param $contextchars Integer: length of snippet
|
|
* @param array $out map for highlighted snippets
|
|
* @param array $offsets map of starting points of snippets
|
|
* @protected
|
|
*/
|
|
function process( $pattern, $extracts, &$linesleft, &$contextchars, &$out, &$offsets ) {
|
|
if ( $linesleft == 0 ) {
|
|
return; // nothing to do
|
|
}
|
|
foreach ( $extracts as $index => $line ) {
|
|
if ( array_key_exists( $index, $out ) ) {
|
|
continue; // this line already highlighted
|
|
}
|
|
|
|
$m = array();
|
|
if ( !preg_match( $pattern, $line, $m, PREG_OFFSET_CAPTURE ) ) {
|
|
continue;
|
|
}
|
|
|
|
$offset = $m[0][1];
|
|
$len = strlen( $m[0][0] );
|
|
if ( $offset + $len < $contextchars ) {
|
|
$begin = 0;
|
|
} elseif ( $len > $contextchars ) {
|
|
$begin = $offset;
|
|
} else {
|
|
$begin = $offset + intval( ( $len - $contextchars ) / 2 );
|
|
}
|
|
|
|
$end = $begin + $contextchars;
|
|
|
|
$posBegin = $begin;
|
|
// basic snippet from this line
|
|
$out[$index] = $this->extract( $line, $begin, $end, $posBegin );
|
|
$offsets[$index] = $posBegin;
|
|
$linesleft--;
|
|
if ( $linesleft == 0 ) {
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Basic wikitext removal
|
|
* @protected
|
|
* @return mixed
|
|
*/
|
|
function removeWiki( $text ) {
|
|
$fname = __METHOD__;
|
|
wfProfileIn( $fname );
|
|
|
|
// $text = preg_replace( "/'{2,5}/", "", $text );
|
|
// $text = preg_replace( "/\[[a-z]+:\/\/[^ ]+ ([^]]+)\]/", "\\2", $text );
|
|
// $text = preg_replace( "/\[\[([^]|]+)\]\]/", "\\1", $text );
|
|
// $text = preg_replace( "/\[\[([^]]+\|)?([^|]]+)\]\]/", "\\2", $text );
|
|
// $text = preg_replace( "/\\{\\|(.*?)\\|\\}/", "", $text );
|
|
// $text = preg_replace( "/\\[\\[[A-Za-z_-]+:([^|]+?)\\]\\]/", "", $text );
|
|
$text = preg_replace( "/\\{\\{([^|]+?)\\}\\}/", "", $text );
|
|
$text = preg_replace( "/\\{\\{([^|]+\\|)(.*?)\\}\\}/", "\\2", $text );
|
|
$text = preg_replace( "/\\[\\[([^|]+?)\\]\\]/", "\\1", $text );
|
|
$text = preg_replace_callback( "/\\[\\[([^|]+\\|)(.*?)\\]\\]/", array( $this, 'linkReplace' ), $text );
|
|
// $text = preg_replace("/\\[\\[([^|]+\\|)(.*?)\\]\\]/", "\\2", $text);
|
|
$text = preg_replace( "/<\/?[^>]+>/", "", $text );
|
|
$text = preg_replace( "/'''''/", "", $text );
|
|
$text = preg_replace( "/('''|<\/?[iIuUbB]>)/", "", $text );
|
|
$text = preg_replace( "/''/", "", $text );
|
|
|
|
wfProfileOut( $fname );
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* callback to replace [[target|caption]] kind of links, if
|
|
* the target is category or image, leave it
|
|
*
|
|
* @param $matches Array
|
|
*/
|
|
function linkReplace( $matches ) {
|
|
$colon = strpos( $matches[1], ':' );
|
|
if ( $colon === false ) {
|
|
return $matches[2]; // replace with caption
|
|
}
|
|
global $wgContLang;
|
|
$ns = substr( $matches[1], 0, $colon );
|
|
$index = $wgContLang->getNsIndex( $ns );
|
|
if ( $index !== false && ( $index == NS_FILE || $index == NS_CATEGORY ) ) {
|
|
return $matches[0]; // return the whole thing
|
|
} else {
|
|
return $matches[2];
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Simple & fast snippet extraction, but gives completely unrelevant
|
|
* snippets
|
|
*
|
|
* @param $text String
|
|
* @param $terms Array
|
|
* @param $contextlines Integer
|
|
* @param $contextchars Integer
|
|
* @return String
|
|
*/
|
|
public function highlightSimple( $text, $terms, $contextlines, $contextchars ) {
|
|
global $wgContLang;
|
|
$fname = __METHOD__;
|
|
|
|
$lines = explode( "\n", $text );
|
|
|
|
$terms = implode( '|', $terms );
|
|
$max = intval( $contextchars ) + 1;
|
|
$pat1 = "/(.*)($terms)(.{0,$max})/i";
|
|
|
|
$lineno = 0;
|
|
|
|
$extract = "";
|
|
wfProfileIn( "$fname-extract" );
|
|
foreach ( $lines as $line ) {
|
|
if ( 0 == $contextlines ) {
|
|
break;
|
|
}
|
|
++$lineno;
|
|
$m = array();
|
|
if ( ! preg_match( $pat1, $line, $m ) ) {
|
|
continue;
|
|
}
|
|
--$contextlines;
|
|
// truncate function changes ... to relevant i18n message.
|
|
$pre = $wgContLang->truncate( $m[1], - $contextchars, '...', false );
|
|
|
|
if ( count( $m ) < 3 ) {
|
|
$post = '';
|
|
} else {
|
|
$post = $wgContLang->truncate( $m[3], $contextchars, '...', false );
|
|
}
|
|
|
|
$found = $m[2];
|
|
|
|
$line = htmlspecialchars( $pre . $found . $post );
|
|
$pat2 = '/(' . $terms . ")/i";
|
|
$line = preg_replace( $pat2, "<span class='searchmatch'>\\1</span>", $line );
|
|
|
|
$extract .= "${line}\n";
|
|
}
|
|
wfProfileOut( "$fname-extract" );
|
|
|
|
return $extract;
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Dummy class to be used when non-supported Database engine is present.
|
|
* @todo FIXME: Dummy class should probably try something at least mildly useful,
|
|
* such as a LIKE search through titles.
|
|
* @ingroup Search
|
|
*/
|
|
class SearchEngineDummy extends SearchEngine {
|
|
// no-op
|
|
}
|