SpecialSearch.php

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<?php
class SpecialSearch extends SpecialPage {
    protected $profile;

    protected $searchEngine;

    protected $searchEngineType;

    protected $extraParams = array();

    protected $mPrefix;

    protected $limit, $offset;

    protected $namespaces;

    protected $didYouMeanHtml, $fulltext;

    const NAMESPACES_CURRENT = 'sense';

    public function __construct() {
        parent::__construct( 'Search' );
    }

    public function execute( $par ) {
        $this->setHeaders();
        $this->outputHeader();
        $out = $this->getOutput();
        $out->allowClickjacking();
        $out->addModuleStyles( array(
            'mediawiki.special', 'mediawiki.special.search', 'mediawiki.ui', 'mediawiki.ui.button'
        ) );

        // 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();

        $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 = SearchEngine::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->didYouMeanHtml = ''; # html of did you mean... link
        $this->fulltext = $request->getVal( 'fulltext' );
        $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 = SearchEngine::getNearMatch( $term );

        if ( !wfRunHooks( 'SpecialSearchGo', array( &$title, &$term ) ) ) {
            # Hook requested termination
            return;
        }

        if ( !is_null( $title ) ) {
            $this->getOutput()->redirect( $title->getFullURL() );

            return;
        }
        # No match, generate an edit URL
        $title = Title::newFromText( $term );
        if ( !is_null( $title ) ) {
            global $wgGoToEdit;
            wfRunHooks( 'SpecialSearchNogomatch', array( &$title ) );
            wfDebugLog( 'nogomatch', $title->getFullText(), 'private' );

            # If the feature is enabled, go straight to the edit page
            if ( $wgGoToEdit ) {
                $this->getOutput()->redirect( $title->getFullURL( array( 'action' => 'edit' ) ) );

                return;
            }
        }
        $this->showResults( $term );
    }

    public function showResults( $term ) {
        global $wgDisableTextSearch, $wgSearchForwardUrl, $wgContLang, $wgScript;

        $profile = new ProfileSection( __METHOD__ );
        $search = $this->getSearchEngine();
        $search->setLimitOffset( $this->limit, $this->offset );
        $search->setNamespaces( $this->namespaces );
        $search->prefix = $this->mPrefix;
        $term = $search->transformSearchTerm( $term );

        wfRunHooks( 'SpecialSearchSetupEngine', array( $this, $this->profile, $search ) );

        $this->setupPage( $term );

        $out = $this->getOutput();

        if ( $wgDisableTextSearch ) {
            if ( $wgSearchForwardUrl ) {
                $url = str_replace( '$1', urlencode( $term ), $wgSearchForwardUrl );
                $out->redirect( $url );
            } else {
                $out->addHTML(
                    Xml::openElement( 'fieldset' ) .
                    Xml::element( 'legend', null, $this->msg( 'search-external' )->text() ) .
                    Xml::element( 'p', array( '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 );
        if ( !( $titleMatches instanceof SearchResultTooMany ) ) {
            $textMatches = $search->searchText( $rewritten );
        }

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

        // did you mean... suggestions
        if ( $showSuggestion && $textMatches && !$textStatus && $textMatches->hasSuggestion() ) {
            $st = SpecialPage::getTitleFor( 'Search' );

            # mirror Go/Search behavior of original request ..
            $didYouMeanParams = array( 'search' => $textMatches->getSuggestionQuery() );

            if ( $this->fulltext != null ) {
                $didYouMeanParams['fulltext'] = $this->fulltext;
            }

            $stParams = array_merge(
                $didYouMeanParams,
                $this->powerSearchOptions()
            );

            $suggestionSnippet = $textMatches->getSuggestionSnippet();

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

            $suggestLink = Linker::linkKnown(
                $st,
                $suggestionSnippet,
                array(),
                $stParams
            );

            $this->didYouMeanHtml = '<div class="searchdidyoumean">' . $this->msg( 'search-suggest' )->rawParams( $suggestLink )->text() . '</div>';
        }

        if ( !wfRunHooks( 'SpecialSearchResultsPrepend', array( $this, $out, $term ) ) ) {
            # Hook requested termination
            return;
        }

        // start rendering the page
        $out->addHtml(
            Xml::openElement(
                'form',
                array(
                    'id' => ( $this->profile === 'advanced' ? 'powersearch' : 'search' ),
                    'method' => 'get',
                    'action' => $wgScript
                )
            )
        );
        $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', array( 'id' => 'mw-search-top-table' ) ) .
            $this->shortDialog( $term ) .
            Xml::closeElement( 'div' )
        );

        // Sometimes the search engine knows there are too many hits
        if ( $titleMatches instanceof SearchResultTooMany ) {
            $out->wrapWikiMsg( "==$1==\n", 'toomanymatches' );

            return;
        }

        $filePrefix = $wgContLang->getFormattedNsText( NS_FILE ) . ':';
        if ( trim( $term ) === '' || $filePrefix === trim( $term ) ) {
            $out->addHTML( $this->formHeader( $term, 0, 0 ) );
            $out->addHtml( $this->getProfileForm( $this->profile, $term ) );
            $out->addHTML( '</form>' );

            // Empty query -- straight view of search form
            return;
        }

        // Get number of results
        $titleMatchesNum = $titleMatches ? $titleMatches->numRows() : 0;
        $textMatchesNum = $textMatches ? $textMatches->numRows() : 0;
        // Total initial query matches (possible false positives)
        $num = $titleMatchesNum + $textMatchesNum;

        // Get total actual results (after second filtering, if any)
        $numTitleMatches = $titleMatches && !is_null( $titleMatches->getTotalHits() ) ?
            $titleMatches->getTotalHits() : $titleMatchesNum;
        $numTextMatches = $textMatches && !is_null( $textMatches->getTotalHits() ) ?
            $textMatches->getTotalHits() : $textMatchesNum;

        // get total number of results if backend can calculate it
        $totalRes = 0;
        if ( $titleMatches && !is_null( $titleMatches->getTotalHits() ) ) {
            $totalRes += $titleMatches->getTotalHits();
        }
        if ( $textMatches && !is_null( $textMatches->getTotalHits() ) ) {
            $totalRes += $textMatches->getTotalHits();
        }

        // show number of results and current offset
        $out->addHTML( $this->formHeader( $term, $num, $totalRes ) );
        $out->addHtml( $this->getProfileForm( $this->profile, $term ) );

        $out->addHtml( Xml::closeElement( 'form' ) );
        $out->addHtml( "<div class='searchresults'>" );

        // prev/next links
        if ( $num || $this->offset ) {
            // Show the create link ahead
            $this->showCreateLink( $title, $num, $titleMatches, $textMatches );
            $prevnext = $this->getLanguage()->viewPrevNext( $this->getPageTitle(), $this->offset, $this->limit,
                $this->powerSearchOptions() + array( 'search' => $term ),
                max( $titleMatchesNum, $textMatchesNum ) < $this->limit
            );
            //$out->addHTML( "<p class='mw-search-pager-top'>{$prevnext}</p>\n" );
            wfRunHooks( 'SpecialSearchResults', array( $term, &$titleMatches, &$textMatches ) );
        } else {
            wfRunHooks( 'SpecialSearchNoResults', array( $term ) );
        }

        $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 ) {
                // if no title matches the heading is redundant
                $out->wrapWikiMsg( "==$1==\n", 'textmatches' );
            } elseif ( $totalRes == 0 ) {
                # Don't show the 'no text matches' if we received title matches
                # $out->wrapWikiMsg( "==$1==\n", 'notextmatches' );
            }
            // show interwiki results if any
            if ( $textMatches->hasInterwikiResults() ) {
                $out->addHTML( $this->showInterwiki( $textMatches->getInterwikiResults(), $term ) );
            }
            // show results
            if ( $numTextMatches > 0 ) {
                $out->addHTML( $this->showMatches( $textMatches ) );
            }

            $textMatches->free();
        }
        if ( $num === 0 ) {
            if ( $textStatus ) {
                $out->addHTML( '<div class="error">' .
                    htmlspecialchars( $textStatus->getWikiText( 'search-error' ) ) . '</div>' );
            } else {
                $out->wrapWikiMsg( "<p class=\"mw-search-nonefound\">\n$1</p>",
                    array( 'search-nonefound', wfEscapeWikiText( $term ) ) );
                $this->showCreateLink( $title, $num, $titleMatches, $textMatches );
            }
        }
        $out->addHtml( "</div>" );

        if ( $num || $this->offset ) {
            $out->addHTML( "<p class='mw-search-pager-bottom'>{$prevnext}</p>\n" );
        }
        wfRunHooks( 'SpecialSearchResultsAppend', array( $this, $out, $term ) );
    }

    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;
        }

        if ( $title->isKnown() ) {
            $messageName = 'searchmenu-exists';
        } elseif ( $title->userCan( 'create', $this->getUser() ) ) {
            $messageName = 'searchmenu-new';
        } else {
            $messageName = 'searchmenu-new-nocreate';
        }
        $params = array( $messageName, wfEscapeWikiText( $title->getPrefixedText() ), Message::numParam( $num ) );
        wfRunHooks( 'SpecialSearchCreateLink', array( $title, &$params ) );

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

    protected function setupPage( $term ) {
        # Should advanced UI be used?
        $this->searchAdvanced = ( $this->profile === 'advanced' );
        $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 powerSearch( &$request ) {
        $arr = array();
        foreach ( SearchEngine::searchableNamespaces() as $ns => $name ) {
            if ( $request->getCheck( 'ns' . $ns ) ) {
                $arr[] = $ns;
            }
        }

        return $arr;
    }

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

        return $opt + $this->extraParams;
    }

    protected function showMatches( &$matches ) {
        global $wgContLang;

        $profile = new ProfileSection( __METHOD__ );
        $terms = $wgContLang->convertForSearchResult( $matches->termMatches() );

        $out = "<ul class='mw-search-results'>\n";
        $result = $matches->next();
        while ( $result ) {
            $out .= $this->showHit( $result, $terms );
            $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 ) {
        $profile = new ProfileSection( __METHOD__ );

        if ( $result->isBrokenTitle() ) {
            return "<!-- Broken link in search result -->\n";
        }

        $title = $result->getTitle();

        $titleSnippet = $result->getTitleSnippet( $terms );

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

        $link_t = clone $title;

        wfRunHooks( 'ShowSearchHitTitle',
            array( &$link_t, &$titleSnippet, $result, $terms, $this ) );

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

        //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 "<!-- missing page " . htmlspecialchars( $title->getPrefixedText() ) . "-->\n";
        }

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

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

        $lang = $this->getLanguage();

        // format score
        if ( is_null( $result->getScore() ) ) {
            // Search engine doesn't report scoring info
            $score = '';
        } else {
            $percent = sprintf( '%2.1f', $result->getScore() * 100 );
            $score = $this->msg( 'search-result-score' )->numParams( $percent )->text()
                . ' - ';
        }

        // 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() );

        // link to related articles if supported
        $related = '';
        if ( $result->hasRelated() ) {
            $st = SpecialPage::getTitleFor( 'Search' );
            $stParams = array_merge(
                $this->powerSearchOptions(),
                array(
                    'search' => $this->msg( 'searchrelated' )->inContentLanguage()->text() .
                        ':' . $title->getPrefixedText(),
                    'fulltext' => $this->msg( 'search' )->text()
                )
            );

            $related = ' -- ' . Linker::linkKnown(
                $st,
                $this->msg( 'search-relatedarticle' )->text(),
                array(),
                $stParams
            );
        }

        $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( array( '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;">' .
                        $thumb->toHtml( array( 'desc-link' => true ) ) .
                        '</td>' .
                        '<td style="vertical-align: top;">' .
                        "{$link} {$fileMatch}" .
                        $extract .
                        "<div class='mw-search-result-data'>{$score}{$desc} - {$date}{$related}</div>" .
                        '</td>' .
                        '</tr>' .
                        '</table>' .
                        "</li>\n";
                }
            }
        }

        $html = null;

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

        return $html;
    }

    protected function showInterwiki( $matches, $query ) {
        global $wgContLang;
        $profile = new ProfileSection( __METHOD__ );

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

        if ( !is_array( $matches ) ) {
            $matches = array( $matches );
        }

        foreach ( $matches as $set ) {
            $prev = null;
            $result = $set->next();
            while ( $result ) {
                $out .= $this->showInterwikiHit( $result, $prev, $query, $customCaptions );
                $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, $customCaptions ) {
        $profile = new ProfileSection( __METHOD__ );

        if ( $result->isBrokenTitle() ) {
            return "<!-- Broken link in search result -->\n";
        }

        $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(), $customCaptions ) ) {
                // captions from 'search-interwiki-custom'
                $caption = $customCaptions[$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(),
                array(),
                array(
                    '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 getProfileForm( $profile, $term ) {
        // Hidden stuff
        $opts = array();
        $opts['profile'] = $this->profile;

        if ( $profile === 'advanced' ) {
            return $this->powerSearchBox( $term, $opts );
        } else {
            $form = '';
            wfRunHooks( 'SpecialSearchProfileForm', array( $this, &$form, $profile, $term, $opts ) );

            return $form;
        }
    }

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

        // Groups namespaces into rows according to subject
        $rows = array();
        foreach ( SearchEngine::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', array( 'style' => 'white-space: nowrap' )
                ) .
                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',
                array( 'cellpadding' => 0, 'cellspacing' => 0 )
            );

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

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

        $showSections = array( 'namespaceTables' => $namespaceTables );

        wfRunHooks( 'SpecialSearchPowerBox', array( &$showSections, $term, $opts ) );

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

        // Return final output
        return Xml::openElement(
            'fieldset',
            array( 'id' => 'mw-searchoptions', 'style' => 'margin:0em;' )
        ) .
            Xml::element( 'legend', null, $this->msg( 'powersearch-legend' )->text() ) .
            Xml::tags( 'h4', null, $this->msg( 'powersearch-ns' )->parse() ) .
            Html::element( 'div', array( 'id' => 'mw-search-togglebox' ) ) .
            Xml::element( 'div', array( 'class' => 'divider' ), '', false ) .
            implode( Xml::element( 'div', array( 'class' => 'divider' ), '', false ), $showSections ) .
            $hidden .
            Xml::closeElement( 'fieldset' );
    }

    protected function getSearchProfiles() {
        // Builds list of Search Types (profiles)
        $nsAllSet = array_keys( SearchEngine::searchableNamespaces() );

        $profiles = array(
            'default' => array(
                'message' => 'searchprofile-articles',
                'tooltip' => 'searchprofile-articles-tooltip',
                'namespaces' => SearchEngine::defaultNamespaces(),
                'namespace-messages' => SearchEngine::namespacesAsText(
                    SearchEngine::defaultNamespaces()
                ),
            ),
            'images' => array(
                'message' => 'searchprofile-images',
                'tooltip' => 'searchprofile-images-tooltip',
                'namespaces' => array( NS_FILE ),
            ),
            'help' => array(
                'message' => 'searchprofile-project',
                'tooltip' => 'searchprofile-project-tooltip',
                'namespaces' => SearchEngine::helpNamespaces(),
                'namespace-messages' => SearchEngine::namespacesAsText(
                    SearchEngine::helpNamespaces()
                ),
            ),
            'all' => array(
                'message' => 'searchprofile-everything',
                'tooltip' => 'searchprofile-everything-tooltip',
                'namespaces' => $nsAllSet,
            ),
            'advanced' => array(
                'message' => 'searchprofile-advanced',
                'tooltip' => 'searchprofile-advanced-tooltip',
                'namespaces' => self::NAMESPACES_CURRENT,
            )
        );

        wfRunHooks( 'SpecialSearchProfiles', array( &$profiles ) );

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

        return $profiles;
    }

    protected function formHeader( $term, $resultsShown, $totalNum ) {
        $out = Xml::openElement( 'div', array( 'class' => 'mw-search-formheader' ) );

        $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', array( 'class' => 'search-types' ) );
        $out .= Xml::openElement( 'ul' );
        foreach ( $profiles as $id => $profile ) {
            if ( !isset( $profile['parameters'] ) ) {
                $profile['parameters'] = array();
            }
            $profile['parameters']['profile'] = $id;

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

        // Results-info
        if ( $resultsShown > 0 ) {
            if ( $totalNum > 0 ) {
                $top = $this->msg( 'showingresultsheader' )
                    ->numParams( $this->offset + 1, $this->offset + $resultsShown, $totalNum )
                    ->params( wfEscapeWikiText( $term ) )
                    ->numParams( $resultsShown )
                    ->parse();
            } elseif ( $resultsShown >= $this->limit ) {
                $top = $this->msg( 'showingresults' )
                    ->numParams( $this->limit, $this->offset + 1 )
                    ->parse();
            } else {
                $top = $this->msg( 'showingresultsnum' )
                    ->numParams( $this->limit, $this->offset + 1, $resultsShown )
                    ->parse();
            }
            $out .= Xml::tags( 'div', array( 'class' => 'results-info' ),
                Xml::tags( 'ul', null, Xml::tags( 'li', null, $top ) )
            );
        }

        $out .= Xml::element( 'div', array( 'style' => 'clear:both' ), '', false );
        $out .= Xml::closeElement( 'div' );

        return $out;
    }

    protected function shortDialog( $term ) {
        $out = Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() );
        $out .= Html::hidden( 'profile', $this->profile ) . "\n";
        // Term box
        $out .= Html::input( 'search', $term, 'search', array(
            'id' => $this->profile === 'advanced' ? 'powerSearchText' : 'searchText',
            'size' => '50',
            'autofocus',
            'class' => 'mw-ui-input',
        ) ) . "\n";
        $out .= Html::hidden( 'fulltext', 'Search' ) . "\n";
        $out .= Xml::submitButton(
            $this->msg( 'searchbutton' )->text(),
            array( 'class' => array( 'mw-ui-button', 'mw-ui-progressive' ) )
        ) . "\n";

        return $out . $this->didYouMeanHtml;
    }

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

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

        return Xml::element(
            'a',
            array(
                '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 ?
                SearchEngine::create( $this->searchEngineType ) : SearchEngine::create();
        }

        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';
    }
}