SpecialSearch.php

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<?php
use MediaWiki\MediaWikiServices;

class SpecialSearch extends SpecialPage {
    protected $profile;

    protected $searchEngine;

    protected $searchEngineType;

    protected $extraParams = [];

    protected $mPrefix;

    protected $limit, $offset;

    protected $namespaces;

    protected $fulltext;

    protected $runSuggestion = true;

    protected $customCaptions;

    protected $searchConfig;

    const NAMESPACES_CURRENT = 'sense';

    public function __construct() {
        parent::__construct( 'Search' );
        $this->searchConfig = MediaWikiServices::getInstance()->getSearchEngineConfig();
    }

    public function execute( $par ) {
        $this->setHeaders();
        $this->outputHeader();
        $out = $this->getOutput();
        $out->allowClickjacking();
        $out->addModuleStyles( [
            'mediawiki.special', 'mediawiki.special.search', 'mediawiki.ui', 'mediawiki.ui.button',
            'mediawiki.ui.input', 'mediawiki.widgets.SearchInputWidget.styles',
        ] );
        $this->addHelpLink( 'Help:Searching' );

        // Strip underscores from title parameter; most of the time we'll want
        // text form here. But don't strip underscores from actual text params!
        $titleParam = str_replace( '_', ' ', $par );

        $request = $this->getRequest();

        // Fetch the search term
        $search = str_replace( "\n", " ", $request->getText( 'search', $titleParam ) );

        $this->load();
        if ( !is_null( $request->getVal( 'nsRemember' ) ) ) {
            $this->saveNamespaces();
            // Remove the token from the URL to prevent the user from inadvertently
            // exposing it (e.g. by pasting it into a public wiki page) or undoing
            // later settings changes (e.g. by reloading the page).
            $query = $request->getValues();
            unset( $query['title'], $query['nsRemember'] );
            $out->redirect( $this->getPageTitle()->getFullURL( $query ) );
            return;
        }

        $out->addJsConfigVars( [ 'searchTerm' => $search ] );
        $this->searchEngineType = $request->getVal( 'srbackend' );

        if ( $request->getVal( 'fulltext' )
            || !is_null( $request->getVal( 'offset' ) )
        ) {
            $this->showResults( $search );
        } else {
            $this->goResult( $search );
        }
    }

    public function load() {
        $request = $this->getRequest();
        list( $this->limit, $this->offset ) = $request->getLimitOffset( 20, '' );
        $this->mPrefix = $request->getVal( 'prefix', '' );

        $user = $this->getUser();

        # Extract manually requested namespaces
        $nslist = $this->powerSearch( $request );
        if ( !count( $nslist ) ) {
            # Fallback to user preference
            $nslist = $this->searchConfig->userNamespaces( $user );
        }

        $profile = null;
        if ( !count( $nslist ) ) {
            $profile = 'default';
        }

        $profile = $request->getVal( 'profile', $profile );
        $profiles = $this->getSearchProfiles();
        if ( $profile === null ) {
            // BC with old request format
            $profile = 'advanced';
            foreach ( $profiles as $key => $data ) {
                if ( $nslist === $data['namespaces'] && $key !== 'advanced' ) {
                    $profile = $key;
                }
            }
            $this->namespaces = $nslist;
        } elseif ( $profile === 'advanced' ) {
            $this->namespaces = $nslist;
        } else {
            if ( isset( $profiles[$profile]['namespaces'] ) ) {
                $this->namespaces = $profiles[$profile]['namespaces'];
            } else {
                // Unknown profile requested
                $profile = 'default';
                $this->namespaces = $profiles['default']['namespaces'];
            }
        }

        $this->fulltext = $request->getVal( 'fulltext' );
        $this->runSuggestion = (bool)$request->getVal( 'runsuggestion', true );
        $this->profile = $profile;
    }

    public function goResult( $term ) {
        $this->setupPage( $term );
        # Try to go to page as entered.
        $title = Title::newFromText( $term );
        # If the string cannot be used to create a title
        if ( is_null( $title ) ) {
            $this->showResults( $term );

            return;
        }
        # If there's an exact or very near match, jump right there.
        $title = $this->getSearchEngine()
            ->getNearMatcher( $this->getConfig() )->getNearMatch( $term );

        if ( !is_null( $title ) &&
            Hooks::run( 'SpecialSearchGoResult', [ $term, $title, &$url ] )
        ) {
            if ( $url === null ) {
                $url = $title->getFullUrlForRedirect();
            }
            $this->getOutput()->redirect( $url );

            return;
        }
        # No match, generate an edit URL
        $title = Title::newFromText( $term );
        if ( !is_null( $title ) ) {
            Hooks::run( 'SpecialSearchNogomatch', [ &$title ] );
        }
        $this->showResults( $term );
    }

    public function showResults( $term ) {
        global $wgContLang;

        $search = $this->getSearchEngine();
        $search->setFeatureData( 'rewrite', $this->runSuggestion );
        $search->setLimitOffset( $this->limit, $this->offset );
        $search->setNamespaces( $this->namespaces );
        $search->prefix = $this->mPrefix;
        $term = $search->transformSearchTerm( $term );

        Hooks::run( 'SpecialSearchSetupEngine', [ $this, $this->profile, $search ] );

        $this->setupPage( $term );

        $out = $this->getOutput();

        if ( $this->getConfig()->get( 'DisableTextSearch' ) ) {
            $searchFowardUrl = $this->getConfig()->get( 'SearchForwardUrl' );
            if ( $searchFowardUrl ) {
                $url = str_replace( '$1', urlencode( $term ), $searchFowardUrl );
                $out->redirect( $url );
            } else {
                $out->addHTML(
                    Xml::openElement( 'fieldset' ) .
                    Xml::element( 'legend', null, $this->msg( 'search-external' )->text() ) .
                    Xml::element(
                        'p',
                        [ 'class' => 'mw-searchdisabled' ],
                        $this->msg( 'searchdisabled' )->text()
                    ) .
                    $this->msg( 'googlesearch' )->rawParams(
                        htmlspecialchars( $term ),
                        'UTF-8',
                        $this->msg( 'searchbutton' )->escaped()
                    )->text() .
                    Xml::closeElement( 'fieldset' )
                );
            }

            return;
        }

        $title = Title::newFromText( $term );
        $showSuggestion = $title === null || !$title->isKnown();
        $search->setShowSuggestion( $showSuggestion );

        // fetch search results
        $rewritten = $search->replacePrefixes( $term );

        $titleMatches = $search->searchTitle( $rewritten );
        $textMatches = $search->searchText( $rewritten );

        $textStatus = null;
        if ( $textMatches instanceof Status ) {
            $textStatus = $textMatches;
            $textMatches = null;
        }

        // did you mean... suggestions
        $didYouMeanHtml = '';
        if ( $showSuggestion && $textMatches && !$textStatus ) {
            if ( $textMatches->hasRewrittenQuery() ) {
                $didYouMeanHtml = $this->getDidYouMeanRewrittenHtml( $term, $textMatches );
            } elseif ( $textMatches->hasSuggestion() ) {
                $didYouMeanHtml = $this->getDidYouMeanHtml( $textMatches );
            }
        }

        if ( !Hooks::run( 'SpecialSearchResultsPrepend', [ $this, $out, $term ] ) ) {
            # Hook requested termination
            return;
        }

        // start rendering the page
        $out->addHTML(
            Xml::openElement(
                'form',
                [
                    'id' => ( $this->isPowerSearch() ? 'powersearch' : 'search' ),
                    'method' => 'get',
                    'action' => wfScript(),
                ]
            )
        );

        // Get number of results
        $titleMatchesNum = $textMatchesNum = $numTitleMatches = $numTextMatches = 0;
        if ( $titleMatches ) {
            $titleMatchesNum = $titleMatches->numRows();
            $numTitleMatches = $titleMatches->getTotalHits();
        }
        if ( $textMatches ) {
            $textMatchesNum = $textMatches->numRows();
            $numTextMatches = $textMatches->getTotalHits();
        }
        $num = $titleMatchesNum + $textMatchesNum;
        $totalRes = $numTitleMatches + $numTextMatches;

        $out->enableOOUI();
        $out->addHTML(
            # This is an awful awful ID name. It's not a table, but we
            # named it poorly from when this was a table so now we're
            # stuck with it
            Xml::openElement( 'div', [ 'id' => 'mw-search-top-table' ] ) .
            $this->shortDialog( $term, $num, $totalRes ) .
            Xml::closeElement( 'div' ) .
            $this->searchProfileTabs( $term ) .
            $this->searchOptions( $term ) .
            Xml::closeElement( 'form' ) .
            $didYouMeanHtml
        );

        $filePrefix = $wgContLang->getFormattedNsText( NS_FILE ) . ':';
        if ( trim( $term ) === '' || $filePrefix === trim( $term ) ) {
            // Empty query -- straight view of search form
            return;
        }

        $out->addHTML( "<div class='searchresults'>" );

        // prev/next links
        $prevnext = null;
        if ( $num || $this->offset ) {
            // Show the create link ahead
            $this->showCreateLink( $title, $num, $titleMatches, $textMatches );
            if ( $totalRes > $this->limit || $this->offset ) {
                if ( $this->searchEngineType !== null ) {
                    $this->setExtraParam( 'srbackend', $this->searchEngineType );
                }
                $prevnext = $this->getLanguage()->viewPrevNext(
                    $this->getPageTitle(),
                    $this->offset,
                    $this->limit,
                    $this->powerSearchOptions() + [ 'search' => $term ],
                    $this->limit + $this->offset >= $totalRes
                );
            }
        }
        Hooks::run( 'SpecialSearchResults', [ $term, &$titleMatches, &$textMatches ] );

        $out->parserOptions()->setEditSection( false );
        if ( $titleMatches ) {
            if ( $numTitleMatches > 0 ) {
                $out->wrapWikiMsg( "==$1==\n", 'titlematches' );
                $out->addHTML( $this->showMatches( $titleMatches ) );
            }
            $titleMatches->free();
        }
        if ( $textMatches && !$textStatus ) {
            // output appropriate heading
            if ( $numTextMatches > 0 && $numTitleMatches > 0 ) {
                $out->addHTML( '<div class="visualClear"></div>' );
                // if no title matches the heading is redundant
                $out->wrapWikiMsg( "==$1==\n", 'textmatches' );
            }

            // show results
            if ( $numTextMatches > 0 ) {
                $out->addHTML( $this->showMatches( $textMatches ) );
            }

            // show secondary interwiki results if any
            if ( $textMatches->hasInterwikiResults( SearchResultSet::SECONDARY_RESULTS ) ) {
                $out->addHTML( $this->showInterwiki( $textMatches->getInterwikiResults(
                        SearchResultSet::SECONDARY_RESULTS ), $term ) );
            }
        }

        $hasOtherResults = $textMatches &&
            $textMatches->hasInterwikiResults( SearchResultSet::INLINE_RESULTS );

        if ( $num === 0 ) {
            if ( $textStatus ) {
                $out->addHTML( '<div class="error">' .
                    $textStatus->getMessage( 'search-error' ) . '</div>' );
            } else {
                $this->showCreateLink( $title, $num, $titleMatches, $textMatches );
                $out->wrapWikiMsg( "<p class=\"mw-search-nonefound\">\n$1</p>",
                    [ $hasOtherResults ? 'search-nonefound-thiswiki' : 'search-nonefound',
                            wfEscapeWikiText( $term )
                    ] );
            }
        }

        if ( $hasOtherResults ) {
            foreach ( $textMatches->getInterwikiResults( SearchResultSet::INLINE_RESULTS )
                        as $interwiki => $interwikiResult ) {
                if ( $interwikiResult instanceof Status || $interwikiResult->numRows() == 0 ) {
                    // ignore bad interwikis for now
                    continue;
                }
                // TODO: wiki header
                $out->addHTML( $this->showMatches( $interwikiResult, $interwiki ) );
            }
        }

        if ( $textMatches ) {
            $textMatches->free();
        }

        $out->addHTML( '<div class="visualClear"></div>' );

        if ( $prevnext ) {
            $out->addHTML( "<p class='mw-search-pager-bottom'>{$prevnext}</p>\n" );
        }

        $out->addHTML( "</div>" );

        Hooks::run( 'SpecialSearchResultsAppend', [ $this, $out, $term ] );

    }

    protected function interwikiHeader( $interwiki, $interwikiResult ) {
        // TODO: we need to figure out how to name wikis correctly
        $wikiMsg = $this->msg( 'search-interwiki-results-' . $interwiki )->parse();
        return "<p class=\"mw-search-interwiki-header\">\n$wikiMsg</p>";
    }

    protected function shouldRunSuggestedQuery( SearchResultSet $textMatches ) {
        if ( !$this->runSuggestion ||
            !$textMatches->hasSuggestion() ||
            $textMatches->numRows() > 0 ||
            $textMatches->searchContainedSyntax()
        ) {
            return false;
        }

        return $this->getConfig()->get( 'SearchRunSuggestedQuery' );
    }

    protected function getDidYouMeanHtml( SearchResultSet $textMatches ) {
        # mirror Go/Search behavior of original request ..
        $params = [ 'search' => $textMatches->getSuggestionQuery() ];
        if ( $this->fulltext != null ) {
            $params['fulltext'] = $this->fulltext;
        }
        $stParams = array_merge( $params, $this->powerSearchOptions() );

        $suggest = Linker::linkKnown(
            $this->getPageTitle(),
            $textMatches->getSuggestionSnippet() ?: null,
            [ 'id' => 'mw-search-DYM-suggestion' ],
            $stParams
        );

        # HTML of did you mean... search suggestion link
        return Html::rawElement(
            'div',
            [ 'class' => 'searchdidyoumean' ],
            $this->msg( 'search-suggest' )->rawParams( $suggest )->parse()
        );
    }

    protected function getDidYouMeanRewrittenHtml( $term, SearchResultSet $textMatches ) {
        // Showing results for '$rewritten'
        // Search instead for '$orig'

        $params = [ 'search' => $textMatches->getQueryAfterRewrite() ];
        if ( $this->fulltext != null ) {
            $params['fulltext'] = $this->fulltext;
        }
        $stParams = array_merge( $params, $this->powerSearchOptions() );

        $rewritten = Linker::linkKnown(
            $this->getPageTitle(),
            $textMatches->getQueryAfterRewriteSnippet() ?: null,
            [ 'id' => 'mw-search-DYM-rewritten' ],
            $stParams
        );

        $stParams['search'] = $term;
        $stParams['runsuggestion'] = 0;
        $original = Linker::linkKnown(
            $this->getPageTitle(),
            htmlspecialchars( $term ),
            [ 'id' => 'mw-search-DYM-original' ],
            $stParams
        );

        return Html::rawElement(
            'div',
            [ 'class' => 'searchdidyoumean' ],
            $this->msg( 'search-rewritten' )->rawParams( $rewritten, $original )->escaped()
        );
    }

    protected function showCreateLink( $title, $num, $titleMatches, $textMatches ) {
        // show direct page/create link if applicable

        // Check DBkey !== '' in case of fragment link only.
        if ( is_null( $title ) || $title->getDBkey() === ''
            || ( $titleMatches !== null && $titleMatches->searchContainedSyntax() )
            || ( $textMatches !== null && $textMatches->searchContainedSyntax() )
        ) {
            // invalid title
            // preserve the paragraph for margins etc...
            $this->getOutput()->addHTML( '<p></p>' );

            return;
        }

        $messageName = 'searchmenu-new-nocreate';
        $linkClass = 'mw-search-createlink';

        if ( !$title->isExternal() ) {
            if ( $title->isKnown() ) {
                $messageName = 'searchmenu-exists';
                $linkClass = 'mw-search-exists';
            } elseif ( $title->quickUserCan( 'create', $this->getUser() ) ) {
                $messageName = 'searchmenu-new';
            }
        }

        $params = [
            $messageName,
            wfEscapeWikiText( $title->getPrefixedText() ),
            Message::numParam( $num )
        ];
        Hooks::run( 'SpecialSearchCreateLink', [ $title, &$params ] );

        // Extensions using the hook might still return an empty $messageName
        if ( $messageName ) {
            $this->getOutput()->wrapWikiMsg( "<p class=\"$linkClass\">\n$1</p>", $params );
        } else {
            // preserve the paragraph for margins etc...
            $this->getOutput()->addHTML( '<p></p>' );
        }
    }

    protected function setupPage( $term ) {
        $out = $this->getOutput();
        if ( strval( $term ) !== '' ) {
            $out->setPageTitle( $this->msg( 'searchresults' ) );
            $out->setHTMLTitle( $this->msg( 'pagetitle' )
                ->rawParams( $this->msg( 'searchresults-title' )->rawParams( $term )->text() )
                ->inContentLanguage()->text()
            );
        }
        // add javascript specific to special:search
        $out->addModules( 'mediawiki.special.search' );
    }

    protected function isPowerSearch() {
        return $this->profile === 'advanced';
    }

    protected function powerSearch( &$request ) {
        $arr = [];
        foreach ( $this->searchConfig->searchableNamespaces() as $ns => $name ) {
            if ( $request->getCheck( 'ns' . $ns ) ) {
                $arr[] = $ns;
            }
        }

        return $arr;
    }

    protected function powerSearchOptions() {
        $opt = [];
        if ( !$this->isPowerSearch() ) {
            $opt['profile'] = $this->profile;
        } else {
            foreach ( $this->namespaces as $n ) {
                $opt['ns' . $n] = 1;
            }
        }

        return $opt + $this->extraParams;
    }

    protected function saveNamespaces() {
        $user = $this->getUser();
        $request = $this->getRequest();

        if ( $user->isLoggedIn() &&
            $user->matchEditToken(
                $request->getVal( 'nsRemember' ),
                'searchnamespace',
                $request
            ) && !wfReadOnly()
        ) {
            // Reset namespace preferences: namespaces are not searched
            // when they're not mentioned in the URL parameters.
            foreach ( MWNamespace::getValidNamespaces() as $n ) {
                $user->setOption( 'searchNs' . $n, false );
            }
            // The request parameters include all the namespaces to be searched.
            // Even if they're the same as an existing profile, they're not eaten.
            foreach ( $this->namespaces as $n ) {
                $user->setOption( 'searchNs' . $n, true );
            }

            DeferredUpdates::addCallableUpdate( function () use ( $user ) {
                $user->saveSettings();
            } );

            return true;
        }

        return false;
    }

    protected function showMatches( &$matches, $interwiki = null ) {
        global $wgContLang;

        $terms = $wgContLang->convertForSearchResult( $matches->termMatches() );
        $out = '';
        $result = $matches->next();
        $pos = $this->offset;

        if ( $result && $interwiki ) {
            $out .= $this->interwikiHeader( $interwiki, $result );
        }

        $out .= "<ul class='mw-search-results'>\n";
        while ( $result ) {
            $out .= $this->showHit( $result, $terms, ++$pos );
            $result = $matches->next();
        }
        $out .= "</ul>\n";

        // convert the whole thing to desired language variant
        $out = $wgContLang->convert( $out );

        return $out;
    }

    protected function showHit( $result, $terms, $position ) {

        if ( $result->isBrokenTitle() ) {
            return '';
        }

        $title = $result->getTitle();

        $titleSnippet = $result->getTitleSnippet();

        if ( $titleSnippet == '' ) {
            $titleSnippet = null;
        }

        $link_t = clone $title;
        $query = [];

        Hooks::run( 'ShowSearchHitTitle',
            [ &$link_t, &$titleSnippet, $result, $terms, $this, &$query ] );

        $link = Linker::linkKnown(
            $link_t,
            $titleSnippet,
            [ 'data-serp-pos' => $position ], // HTML attributes
            $query
        );

        // If page content is not readable, just return the title.
        // This is not quite safe, but better than showing excerpts from non-readable pages
        // Note that hiding the entry entirely would screw up paging.
        if ( !$title->userCan( 'read', $this->getUser() ) ) {
            return "<li>{$link}</li>\n";
        }

        // If the page doesn't *exist*... our search index is out of date.
        // The least confusing at this point is to drop the result.
        // You may get less results, but... oh well. :P
        if ( $result->isMissingRevision() ) {
            return '';
        }

        // format redirects / relevant sections
        $redirectTitle = $result->getRedirectTitle();
        $redirectText = $result->getRedirectSnippet();
        $sectionTitle = $result->getSectionTitle();
        $sectionText = $result->getSectionSnippet();
        $categorySnippet = $result->getCategorySnippet();

        $redirect = '';
        if ( !is_null( $redirectTitle ) ) {
            if ( $redirectText == '' ) {
                $redirectText = null;
            }

            $redirect = "<span class='searchalttitle'>" .
                $this->msg( 'search-redirect' )->rawParams(
                    Linker::linkKnown( $redirectTitle, $redirectText ) )->text() .
                "</span>";
        }

        $section = '';
        if ( !is_null( $sectionTitle ) ) {
            if ( $sectionText == '' ) {
                $sectionText = null;
            }

            $section = "<span class='searchalttitle'>" .
                $this->msg( 'search-section' )->rawParams(
                    Linker::linkKnown( $sectionTitle, $sectionText ) )->text() .
                "</span>";
        }

        $category = '';
        if ( $categorySnippet ) {
            $category = "<span class='searchalttitle'>" .
                $this->msg( 'search-category' )->rawParams( $categorySnippet )->text() .
                "</span>";
        }

        // format text extract
        $extract = "<div class='searchresult'>" . $result->getTextSnippet( $terms ) . "</div>";

        $lang = $this->getLanguage();

        // format description
        $byteSize = $result->getByteSize();
        $wordCount = $result->getWordCount();
        $timestamp = $result->getTimestamp();
        $size = $this->msg( 'search-result-size', $lang->formatSize( $byteSize ) )
            ->numParams( $wordCount )->escaped();

        if ( $title->getNamespace() == NS_CATEGORY ) {
            $cat = Category::newFromTitle( $title );
            $size = $this->msg( 'search-result-category-size' )
                ->numParams( $cat->getPageCount(), $cat->getSubcatCount(), $cat->getFileCount() )
                ->escaped();
        }

        $date = $lang->userTimeAndDate( $timestamp, $this->getUser() );

        $fileMatch = '';
        // Include a thumbnail for media files...
        if ( $title->getNamespace() == NS_FILE ) {
            $img = $result->getFile();
            $img = $img ?: wfFindFile( $title );
            if ( $result->isFileMatch() ) {
                $fileMatch = "<span class='searchalttitle'>" .
                    $this->msg( 'search-file-match' )->escaped() . "</span>";
            }
            if ( $img ) {
                $thumb = $img->transform( [ 'width' => 120, 'height' => 120 ] );
                if ( $thumb ) {
                    $desc = $this->msg( 'parentheses' )->rawParams( $img->getShortDesc() )->escaped();
                    // Float doesn't seem to interact well with the bullets.
                    // Table messes up vertical alignment of the bullets.
                    // Bullets are therefore disabled (didn't look great anyway).
                    return "<li>" .
                        '<table class="searchResultImage">' .
                        '<tr>' .
                        '<td style="width: 120px; text-align: center; vertical-align: top;">' .
                        $thumb->toHtml( [ 'desc-link' => true ] ) .
                        '</td>' .
                        '<td style="vertical-align: top;">' .
                        "{$link} {$redirect} {$category} {$section} {$fileMatch}" .
                        $extract .
                        "<div class='mw-search-result-data'>{$desc} - {$date}</div>" .
                        '</td>' .
                        '</tr>' .
                        '</table>' .
                        "</li>\n";
                }
            }
        }

        $html = null;

        $score = '';
        $related = '';
        if ( Hooks::run( 'ShowSearchHit', [
            $this, $result, $terms,
            &$link, &$redirect, &$section, &$extract,
            &$score, &$size, &$date, &$related,
            &$html
        ] ) ) {
            $html = "<li><div class='mw-search-result-heading'>" .
                "{$link} {$redirect} {$category} {$section} {$fileMatch}</div> {$extract}\n" .
                "<div class='mw-search-result-data'>{$size} - {$date}</div>" .
                "</li>\n";
        }

        return $html;
    }

    protected function getCustomCaptions() {
        if ( is_null( $this->customCaptions ) ) {
            $this->customCaptions = [];
            // format per line <iwprefix>:<caption>
            $customLines = explode( "\n", $this->msg( 'search-interwiki-custom' )->text() );
            foreach ( $customLines as $line ) {
                $parts = explode( ":", $line, 2 );
                if ( count( $parts ) == 2 ) { // validate line
                    $this->customCaptions[$parts[0]] = $parts[1];
                }
            }
        }
    }

    protected function showInterwiki( $matches, $query ) {
        global $wgContLang;

        $out = "<div id='mw-search-interwiki'><div id='mw-search-interwiki-caption'>" .
            $this->msg( 'search-interwiki-caption' )->text() . "</div>\n";
        $out .= "<ul class='mw-search-iwresults'>\n";

        // work out custom project captions
        $this->getCustomCaptions();

        if ( !is_array( $matches ) ) {
            $matches = [ $matches ];
        }

        foreach ( $matches as $set ) {
            $prev = null;
            $result = $set->next();
            while ( $result ) {
                $out .= $this->showInterwikiHit( $result, $prev, $query );
                $prev = $result->getInterwikiPrefix();
                $result = $set->next();
            }
        }

        // @todo Should support paging in a non-confusing way (not sure how though, maybe via ajax)..
        $out .= "</ul></div>\n";

        // convert the whole thing to desired language variant
        $out = $wgContLang->convert( $out );

        return $out;
    }

    protected function showInterwikiHit( $result, $lastInterwiki, $query ) {

        if ( $result->isBrokenTitle() ) {
            return '';
        }

        $title = $result->getTitle();

        $titleSnippet = $result->getTitleSnippet();

        if ( $titleSnippet == '' ) {
            $titleSnippet = null;
        }

        $link = Linker::linkKnown(
            $title,
            $titleSnippet
        );

        // format redirect if any
        $redirectTitle = $result->getRedirectTitle();
        $redirectText = $result->getRedirectSnippet();
        $redirect = '';
        if ( !is_null( $redirectTitle ) ) {
            if ( $redirectText == '' ) {
                $redirectText = null;
            }

            $redirect = "<span class='searchalttitle'>" .
                $this->msg( 'search-redirect' )->rawParams(
                    Linker::linkKnown( $redirectTitle, $redirectText ) )->text() .
                "</span>";
        }

        $out = "";
        // display project name
        if ( is_null( $lastInterwiki ) || $lastInterwiki != $title->getInterwiki() ) {
            if ( array_key_exists( $title->getInterwiki(), $this->customCaptions ) ) {
                // captions from 'search-interwiki-custom'
                $caption = $this->customCaptions[$title->getInterwiki()];
            } else {
                // default is to show the hostname of the other wiki which might suck
                // if there are many wikis on one hostname
                $parsed = wfParseUrl( $title->getFullURL() );
                $caption = $this->msg( 'search-interwiki-default', $parsed['host'] )->text();
            }
            // "more results" link (special page stuff could be localized, but we might not know target lang)
            $searchTitle = Title::newFromText( $title->getInterwiki() . ":Special:Search" );
            $searchLink = Linker::linkKnown(
                $searchTitle,
                $this->msg( 'search-interwiki-more' )->text(),
                [],
                [
                    'search' => $query,
                    'fulltext' => 'Search'
                ]
            );
            $out .= "</ul><div class='mw-search-interwiki-project'><span class='mw-search-interwiki-more'>
                {$searchLink}</span>{$caption}</div>\n<ul>";
        }

        $out .= "<li>{$link} {$redirect}</li>\n";

        return $out;
    }

    protected function powerSearchBox( $term, $opts ) {
        global $wgContLang;

        // Groups namespaces into rows according to subject
        $rows = [];
        foreach ( $this->searchConfig->searchableNamespaces() as $namespace => $name ) {
            $subject = MWNamespace::getSubject( $namespace );
            if ( !array_key_exists( $subject, $rows ) ) {
                $rows[$subject] = "";
            }

            $name = $wgContLang->getConverter()->convertNamespace( $namespace );
            if ( $name == '' ) {
                $name = $this->msg( 'blanknamespace' )->text();
            }

            $rows[$subject] .=
                Xml::openElement( 'td' ) .
                Xml::checkLabel(
                    $name,
                    "ns{$namespace}",
                    "mw-search-ns{$namespace}",
                    in_array( $namespace, $this->namespaces )
                ) .
                Xml::closeElement( 'td' );
        }

        $rows = array_values( $rows );
        $numRows = count( $rows );

        // Lays out namespaces in multiple floating two-column tables so they'll
        // be arranged nicely while still accommodating different screen widths
        $namespaceTables = '';
        for ( $i = 0; $i < $numRows; $i += 4 ) {
            $namespaceTables .= Xml::openElement( 'table' );

            for ( $j = $i; $j < $i + 4 && $j < $numRows; $j++ ) {
                $namespaceTables .= Xml::tags( 'tr', null, $rows[$j] );
            }

            $namespaceTables .= Xml::closeElement( 'table' );
        }

        $showSections = [ 'namespaceTables' => $namespaceTables ];

        Hooks::run( 'SpecialSearchPowerBox', [ &$showSections, $term, $opts ] );

        $hidden = '';
        foreach ( $opts as $key => $value ) {
            $hidden .= Html::hidden( $key, $value );
        }

        # Stuff to feed saveNamespaces()
        $remember = '';
        $user = $this->getUser();
        if ( $user->isLoggedIn() ) {
            $remember .= Xml::checkLabel(
                $this->msg( 'powersearch-remember' )->text(),
                'nsRemember',
                'mw-search-powersearch-remember',
                false,
                // The token goes here rather than in a hidden field so it
                // is only sent when necessary (not every form submission).
                [ 'value' => $user->getEditToken(
                    'searchnamespace',
                    $this->getRequest()
                ) ]
            );
        }

        // Return final output
        return Xml::openElement( 'fieldset', [ 'id' => 'mw-searchoptions' ] ) .
            Xml::element( 'legend', null, $this->msg( 'powersearch-legend' )->text() ) .
            Xml::tags( 'h4', null, $this->msg( 'powersearch-ns' )->parse() ) .
            Xml::element( 'div', [ 'id' => 'mw-search-togglebox' ], '', false ) .
            Xml::element( 'div', [ 'class' => 'divider' ], '', false ) .
            implode( Xml::element( 'div', [ 'class' => 'divider' ], '', false ), $showSections ) .
            $hidden .
            Xml::element( 'div', [ 'class' => 'divider' ], '', false ) .
            $remember .
            Xml::closeElement( 'fieldset' );
    }

    protected function getSearchProfiles() {
        // Builds list of Search Types (profiles)
        $nsAllSet = array_keys( $this->searchConfig->searchableNamespaces() );
        $defaultNs = $this->searchConfig->defaultNamespaces();
        $profiles = [
            'default' => [
                'message' => 'searchprofile-articles',
                'tooltip' => 'searchprofile-articles-tooltip',
                'namespaces' => $defaultNs,
                'namespace-messages' => $this->searchConfig->namespacesAsText(
                    $defaultNs
                ),
            ],
            'images' => [
                'message' => 'searchprofile-images',
                'tooltip' => 'searchprofile-images-tooltip',
                'namespaces' => [ NS_FILE ],
            ],
            'all' => [
                'message' => 'searchprofile-everything',
                'tooltip' => 'searchprofile-everything-tooltip',
                'namespaces' => $nsAllSet,
            ],
            'advanced' => [
                'message' => 'searchprofile-advanced',
                'tooltip' => 'searchprofile-advanced-tooltip',
                'namespaces' => self::NAMESPACES_CURRENT,
            ]
        ];

        Hooks::run( 'SpecialSearchProfiles', [ &$profiles ] );

        foreach ( $profiles as &$data ) {
            if ( !is_array( $data['namespaces'] ) ) {
                continue;
            }
            sort( $data['namespaces'] );
        }

        return $profiles;
    }

    protected function searchProfileTabs( $term ) {
        $out = Xml::openElement( 'div', [ 'class' => 'mw-search-profile-tabs' ] );

        $bareterm = $term;
        if ( $this->startsWithImage( $term ) ) {
            // Deletes prefixes
            $bareterm = substr( $term, strpos( $term, ':' ) + 1 );
        }

        $profiles = $this->getSearchProfiles();
        $lang = $this->getLanguage();

        // Outputs XML for Search Types
        $out .= Xml::openElement( 'div', [ 'class' => 'search-types' ] );
        $out .= Xml::openElement( 'ul' );
        foreach ( $profiles as $id => $profile ) {
            if ( !isset( $profile['parameters'] ) ) {
                $profile['parameters'] = [];
            }
            $profile['parameters']['profile'] = $id;

            $tooltipParam = isset( $profile['namespace-messages'] ) ?
                $lang->commaList( $profile['namespace-messages'] ) : null;
            $out .= Xml::tags(
                'li',
                [
                    'class' => $this->profile === $id ? 'current' : 'normal'
                ],
                $this->makeSearchLink(
                    $bareterm,
                    [],
                    $this->msg( $profile['message'] )->text(),
                    $this->msg( $profile['tooltip'], $tooltipParam )->text(),
                    $profile['parameters']
                )
            );
        }
        $out .= Xml::closeElement( 'ul' );
        $out .= Xml::closeElement( 'div' );
        $out .= Xml::element( 'div', [ 'style' => 'clear:both' ], '', false );
        $out .= Xml::closeElement( 'div' );

        return $out;
    }

    protected function searchOptions( $term ) {
        $out = '';
        $opts = [];
        $opts['profile'] = $this->profile;

        if ( $this->isPowerSearch() ) {
            $out .= $this->powerSearchBox( $term, $opts );
        } else {
            $form = '';
            Hooks::run( 'SpecialSearchProfileForm', [ $this, &$form, $this->profile, $term, $opts ] );
            $out .= $form;
        }

        return $out;
    }

    protected function shortDialog( $term, $resultsShown, $totalNum ) {
        $searchWidget = new MediaWiki\Widget\SearchInputWidget( [
            'id' => 'searchText',
            'name' => 'search',
            'autofocus' => trim( $term ) === '',
            'value' => $term,
            'dataLocation' => 'content',
        ] );

        $out =
            Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() ) .
            Html::hidden( 'profile', $this->profile ) .
            Html::hidden( 'fulltext', 'Search' ) .
            $searchWidget .
            new OOUI\ButtonInputWidget( [
                'type' => 'submit',
                'label' => $this->msg( 'searchbutton' )->text(),
                'flags' => [ 'progressive', 'primary' ],
            ] );

        // Results-info
        if ( $totalNum > 0 && $this->offset < $totalNum ) {
            $top = $this->msg( 'search-showingresults' )
                ->numParams( $this->offset + 1, $this->offset + $resultsShown, $totalNum )
                ->numParams( $resultsShown )
                ->parse();
            $out .= Xml::tags( 'div', [ 'class' => 'results-info' ], $top ) .
                Xml::element( 'div', [ 'style' => 'clear:both' ], '', false );
        }

        return $out;
    }

    protected function makeSearchLink( $term, $namespaces, $label, $tooltip, $params = [] ) {
        $opt = $params;
        foreach ( $namespaces as $n ) {
            $opt['ns' . $n] = 1;
        }

        $stParams = array_merge(
            [
                'search' => $term,
                'fulltext' => $this->msg( 'search' )->text()
            ],
            $opt
        );

        return Xml::element(
            'a',
            [
                'href' => $this->getPageTitle()->getLocalURL( $stParams ),
                'title' => $tooltip
            ],
            $label
        );
    }

    protected function startsWithImage( $term ) {
        global $wgContLang;

        $parts = explode( ':', $term );
        if ( count( $parts ) > 1 ) {
            return $wgContLang->getNsIndex( $parts[0] ) == NS_FILE;
        }

        return false;
    }

    protected function startsWithAll( $term ) {

        $allkeyword = $this->msg( 'searchall' )->inContentLanguage()->text();

        $parts = explode( ':', $term );
        if ( count( $parts ) > 1 ) {
            return $parts[0] == $allkeyword;
        }

        return false;
    }

    public function getSearchEngine() {
        if ( $this->searchEngine === null ) {
            $this->searchEngine = $this->searchEngineType ?
                MediaWikiServices::getInstance()->getSearchEngineFactory()->create( $this->searchEngineType ) :
                MediaWikiServices::getInstance()->newSearchEngine();
        }

        return $this->searchEngine;
    }

    function getProfile() {
        return $this->profile;
    }

    function getNamespaces() {
        return $this->namespaces;
    }

    public function setExtraParam( $key, $value ) {
        $this->extraParams[$key] = $value;
    }

    protected function getGroupName() {
        return 'pages';
    }
}