includes/specials/SpecialSearch.php

   1 <?php
   2 /**
   3  * Implements Special:Search
   4  *
   5  * Copyright © 2004 Brion Vibber <brion@pobox.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  * http://www.gnu.org/copyleft/gpl.html
  21  *
  22  * @file
  23  * @ingroup SpecialPage
  24  */
  25
  26 use MediaWiki\MediaWikiServices;
  27
  28 /**
  29  * implements Special:Search - Run text & title search and display the output
  30  * @ingroup SpecialPage
  31  */
  32 class SpecialSearch extends SpecialPage {
  33         /**
  34          * Current search profile. Search profile is just a name that identifies
  35          * the active search tab on the search page (content, discussions...)
  36          * For users tt replaces the set of enabled namespaces from the query
  37          * string when applicable. Extensions can add new profiles with hooks
  38          * with custom search options just for that profile.
  39          * @var null|string
  40          */
  41         protected $profile;
  42
  43         /** @var SearchEngine Search engine */
  44         protected $searchEngine;
  45
  46         /** @var string Search engine type, if not default */
  47         protected $searchEngineType;
  48
  49         /** @var array For links */
  50         protected $extraParams = [];
  51
  52         /**
  53          * @var string The prefix url parameter. Set on the searcher and the
  54          * is expected to treat it as prefix filter on titles.
  55          */
  56         protected $mPrefix;
  57
  58         /**
  59          * @var int
  60          */
  61         protected $limit, $offset;
  62
  63         /**
  64          * @var array
  65          */
  66         protected $namespaces;
  67
  68         /**
  69          * @var string
  70          */
  71         protected $fulltext;
  72
  73         /**
  74          * @var bool
  75          */
  76         protected $runSuggestion = true;
  77
  78         /**
  79          * Names of the wikis, in format: Interwiki prefix -> caption
  80          * @var array
  81          */
  82         protected $customCaptions;
  83
  84         /**
  85          * Search engine configurations.
  86          * @var SearchEngineConfig
  87          */
  88         protected $searchConfig;
  89
  90         const NAMESPACES_CURRENT = 'sense';
  91
  92         public function __construct() {
  93                 parent::__construct( 'Search' );
  94                 $this->searchConfig = MediaWikiServices::getInstance()->getSearchEngineConfig();
  95         }
  96
  97         /**
  98          * Entry point
  99          *
 100          * @param string $par
 101          */
 102         public function execute( $par ) {
 103                 $request = $this->getRequest();
 104
 105                 // Fetch the search term
 106                 $search = str_replace( "\n", " ", $request->getText( 'search' ) );
 107
 108                 // Historically search terms have been accepted not only in the search query
 109                 // parameter, but also as part of the primary url. This can have PII implications
 110                 // in releasing page view data. As such issue a 301 redirect to the correct
 111                 // URL.
 112                 if ( strlen( $par ) && !strlen( $search ) ) {
 113                         $query = $request->getValues();
 114                         unset( $query['title'] );
 115                         // Strip underscores from title parameter; most of the time we'll want
 116                         // text form here. But don't strip underscores from actual text params!
 117                         $query['search'] = str_replace( '_', ' ', $par );
 118                         $this->getOutput()->redirect( $this->getPageTitle()->getFullURL( $query ), 301 );
 119                         return;
 120                 }
 121
 122                 $this->setHeaders();
 123                 $this->outputHeader();
 124                 $out = $this->getOutput();
 125                 $out->allowClickjacking();
 126                 $out->addModuleStyles( [
 127                         'mediawiki.special', 'mediawiki.special.search.styles', 'mediawiki.ui', 'mediawiki.ui.button',
 128                         'mediawiki.ui.input', 'mediawiki.widgets.SearchInputWidget.styles',
 129                 ] );
 130                 $this->addHelpLink( 'Help:Searching' );
 131
 132                 $this->load();
 133                 if ( !is_null( $request->getVal( 'nsRemember' ) ) ) {
 134                         $this->saveNamespaces();
 135                         // Remove the token from the URL to prevent the user from inadvertently
 136                         // exposing it (e.g. by pasting it into a public wiki page) or undoing
 137                         // later settings changes (e.g. by reloading the page).
 138                         $query = $request->getValues();
 139                         unset( $query['title'], $query['nsRemember'] );
 140                         $out->redirect( $this->getPageTitle()->getFullURL( $query ) );
 141                         return;
 142                 }
 143
 144                 $out->addJsConfigVars( [ 'searchTerm' => $search ] );
 145                 $this->searchEngineType = $request->getVal( 'srbackend' );
 146
 147                 if ( $request->getVal( 'fulltext' )
 148                         || !is_null( $request->getVal( 'offset' ) )
 149                 ) {
 150                         $this->showResults( $search );
 151                 } else {
 152                         $this->goResult( $search );
 153                 }
 154         }
 155
 156         /**
 157          * Set up basic search parameters from the request and user settings.
 158          *
 159          * @see tests/phpunit/includes/specials/SpecialSearchTest.php
 160          */
 161         public function load() {
 162                 $request = $this->getRequest();
 163                 list( $this->limit, $this->offset ) = $request->getLimitOffset( 20, '' );
 164                 $this->mPrefix = $request->getVal( 'prefix', '' );
 165
 166                 $user = $this->getUser();
 167
 168                 # Extract manually requested namespaces
 169                 $nslist = $this->powerSearch( $request );
 170                 if ( !count( $nslist ) ) {
 171                         # Fallback to user preference
 172                         $nslist = $this->searchConfig->userNamespaces( $user );
 173                 }
 174
 175                 $profile = null;
 176                 if ( !count( $nslist ) ) {
 177                         $profile = 'default';
 178                 }
 179
 180                 $profile = $request->getVal( 'profile', $profile );
 181                 $profiles = $this->getSearchProfiles();
 182                 if ( $profile === null ) {
 183                         // BC with old request format
 184                         $profile = 'advanced';
 185                         foreach ( $profiles as $key => $data ) {
 186                                 if ( $nslist === $data['namespaces'] && $key !== 'advanced' ) {
 187                                         $profile = $key;
 188                                 }
 189                         }
 190                         $this->namespaces = $nslist;
 191                 } elseif ( $profile === 'advanced' ) {
 192                         $this->namespaces = $nslist;
 193                 } else {
 194                         if ( isset( $profiles[$profile]['namespaces'] ) ) {
 195                                 $this->namespaces = $profiles[$profile]['namespaces'];
 196                         } else {
 197                                 // Unknown profile requested
 198                                 $profile = 'default';
 199                                 $this->namespaces = $profiles['default']['namespaces'];
 200                         }
 201                 }
 202
 203                 $this->fulltext = $request->getVal( 'fulltext' );
 204                 $this->runSuggestion = (bool)$request->getVal( 'runsuggestion', true );
 205                 $this->profile = $profile;
 206         }
 207
 208         /**
 209          * If an exact title match can be found, jump straight ahead to it.
 210          *
 211          * @param string $term
 212          */
 213         public function goResult( $term ) {
 214                 $this->setupPage( $term );
 215                 # Try to go to page as entered.
 216                 $title = Title::newFromText( $term );
 217                 # If the string cannot be used to create a title
 218                 if ( is_null( $title ) ) {
 219                         $this->showResults( $term );
 220
 221                         return;
 222                 }
 223                 # If there's an exact or very near match, jump right there.
 224                 $title = $this->getSearchEngine()
 225                         ->getNearMatcher( $this->getConfig() )->getNearMatch( $term );
 226
 227                 if ( !is_null( $title ) &&
 228                         Hooks::run( 'SpecialSearchGoResult', [ $term, $title, &$url ] )
 229                 ) {
 230                         if ( $url === null ) {
 231                                 $url = $title->getFullURL();
 232                         }
 233                         $this->getOutput()->redirect( $url );
 234
 235                         return;
 236                 }
 237                 # No match, generate an edit URL
 238                 $title = Title::newFromText( $term );
 239                 if ( !is_null( $title ) ) {
 240                         Hooks::run( 'SpecialSearchNogomatch', [ &$title ] );
 241                 }
 242                 $this->showResults( $term );
 243         }
 244
 245         /**
 246          * @param string $term
 247          */
 248         public function showResults( $term ) {
 249                 global $wgContLang;
 250
 251                 $search = $this->getSearchEngine();
 252                 $search->setFeatureData( 'rewrite', $this->runSuggestion );
 253                 $search->setLimitOffset( $this->limit, $this->offset );
 254                 $search->setNamespaces( $this->namespaces );
 255                 $search->prefix = $this->mPrefix;
 256                 $term = $search->transformSearchTerm( $term );
 257
 258                 Hooks::run( 'SpecialSearchSetupEngine', [ $this, $this->profile, $search ] );
 259
 260                 $this->setupPage( $term );
 261
 262                 $out = $this->getOutput();
 263
 264                 if ( $this->getConfig()->get( 'DisableTextSearch' ) ) {
 265                         $searchFowardUrl = $this->getConfig()->get( 'SearchForwardUrl' );
 266                         if ( $searchFowardUrl ) {
 267                                 $url = str_replace( '$1', urlencode( $term ), $searchFowardUrl );
 268                                 $out->redirect( $url );
 269                         } else {
 270                                 $out->addHTML(
 271                                         Xml::openElement( 'fieldset' ) .
 272                                         Xml::element( 'legend', null, $this->msg( 'search-external' )->text() ) .
 273                                         Xml::element(
 274                                                 'p',
 275                                                 [ 'class' => 'mw-searchdisabled' ],
 276                                                 $this->msg( 'searchdisabled' )->text()
 277                                         ) .
 278                                         $this->msg( 'googlesearch' )->rawParams(
 279                                                 htmlspecialchars( $term ),
 280                                                 'UTF-8',
 281                                                 $this->msg( 'searchbutton' )->escaped()
 282                                         )->text() .
 283                                         Xml::closeElement( 'fieldset' )
 284                                 );
 285                         }
 286
 287                         return;
 288                 }
 289
 290                 $title = Title::newFromText( $term );
 291                 $showSuggestion = $title === null || !$title->isKnown();
 292                 $search->setShowSuggestion( $showSuggestion );
 293
 294                 // fetch search results
 295                 $rewritten = $search->replacePrefixes( $term );
 296
 297                 $titleMatches = $search->searchTitle( $rewritten );
 298                 $textMatches = $search->searchText( $rewritten );
 299
 300                 $textStatus = null;
 301                 if ( $textMatches instanceof Status ) {
 302                         $textStatus = $textMatches;
 303                         $textMatches = null;
 304                 }
 305
 306                 // did you mean... suggestions
 307                 $didYouMeanHtml = '';
 308                 if ( $showSuggestion && $textMatches && !$textStatus ) {
 309                         if ( $textMatches->hasRewrittenQuery() ) {
 310                                 $didYouMeanHtml = $this->getDidYouMeanRewrittenHtml( $term, $textMatches );
 311                         } elseif ( $textMatches->hasSuggestion() ) {
 312                                 $didYouMeanHtml = $this->getDidYouMeanHtml( $textMatches );
 313                         }
 314                 }
 315
 316                 if ( !Hooks::run( 'SpecialSearchResultsPrepend', [ $this, $out, $term ] ) ) {
 317                         # Hook requested termination
 318                         return;
 319                 }
 320
 321                 // start rendering the page
 322                 $out->addHTML(
 323                         Xml::openElement(
 324                                 'form',
 325                                 [
 326                                         'id' => ( $this->isPowerSearch() ? 'powersearch' : 'search' ),
 327                                         'method' => 'get',
 328                                         'action' => wfScript(),
 329                                 ]
 330                         )
 331                 );
 332
 333                 // Get number of results
 334                 $titleMatchesNum = $textMatchesNum = $numTitleMatches = $numTextMatches = 0;
 335                 if ( $titleMatches ) {
 336                         $titleMatchesNum = $titleMatches->numRows();
 337                         $numTitleMatches = $titleMatches->getTotalHits();
 338                 }
 339                 if ( $textMatches ) {
 340                         $textMatchesNum = $textMatches->numRows();
 341                         $numTextMatches = $textMatches->getTotalHits();
 342                 }
 343                 $num = $titleMatchesNum + $textMatchesNum;
 344                 $totalRes = $numTitleMatches + $numTextMatches;
 345
 346                 $out->enableOOUI();
 347                 $out->addHTML(
 348                         # This is an awful awful ID name. It's not a table, but we
 349                         # named it poorly from when this was a table so now we're
 350                         # stuck with it
 351                         Xml::openElement( 'div', [ 'id' => 'mw-search-top-table' ] ) .
 352                         $this->shortDialog( $term, $num, $totalRes ) .
 353                         Xml::closeElement( 'div' ) .
 354                         $this->searchProfileTabs( $term ) .
 355                         $this->searchOptions( $term ) .
 356                         Xml::closeElement( 'form' ) .
 357                         $didYouMeanHtml
 358                 );
 359
 360                 $filePrefix = $wgContLang->getFormattedNsText( NS_FILE ) . ':';
 361                 if ( trim( $term ) === '' || $filePrefix === trim( $term ) ) {
 362                         // Empty query -- straight view of search form
 363                         return;
 364                 }
 365
 366                 $out->addHTML( "<div class='searchresults'>" );
 367
 368                 // prev/next links
 369                 $prevnext = null;
 370                 if ( $num || $this->offset ) {
 371                         // Show the create link ahead
 372                         $this->showCreateLink( $title, $num, $titleMatches, $textMatches );
 373                         if ( $totalRes > $this->limit || $this->offset ) {
 374                                 if ( $this->searchEngineType !== null ) {
 375                                         $this->setExtraParam( 'srbackend', $this->searchEngineType );
 376                                 }
 377                                 $prevnext = $this->getLanguage()->viewPrevNext(
 378                                         $this->getPageTitle(),
 379                                         $this->offset,
 380                                         $this->limit,
 381                                         $this->powerSearchOptions() + [ 'search' => $term ],
 382                                         $this->limit + $this->offset >= $totalRes
 383                                 );
 384                         }
 385                 }
 386                 Hooks::run( 'SpecialSearchResults', [ $term, &$titleMatches, &$textMatches ] );
 387
 388                 $out->parserOptions()->setEditSection( false );
 389                 if ( $titleMatches ) {
 390                         if ( $numTitleMatches > 0 ) {
 391                                 $out->wrapWikiMsg( "==$1==\n", 'titlematches' );
 392                                 $out->addHTML( $this->showMatches( $titleMatches ) );
 393                         }
 394                         $titleMatches->free();
 395                 }
 396                 if ( $textMatches && !$textStatus ) {
 397                         // output appropriate heading
 398                         if ( $numTextMatches > 0 && $numTitleMatches > 0 ) {
 399                                 $out->addHTML( '<div class="mw-search-visualclear"></div>' );
 400                                 // if no title matches the heading is redundant
 401                                 $out->wrapWikiMsg( "==$1==\n", 'textmatches' );
 402                         }
 403
 404                         // show results
 405                         if ( $numTextMatches > 0 ) {
 406                                 $out->addHTML( $this->showMatches( $textMatches ) );
 407                         }
 408
 409                         // show secondary interwiki results if any
 410                         if ( $textMatches->hasInterwikiResults( SearchResultSet::SECONDARY_RESULTS ) ) {
 411                                 $out->addHTML( $this->showInterwiki( $textMatches->getInterwikiResults(
 412                                                 SearchResultSet::SECONDARY_RESULTS ), $term ) );
 413                         }
 414                 }
 415
 416                 $hasOtherResults = $textMatches &&
 417                         $textMatches->hasInterwikiResults( SearchResultSet::INLINE_RESULTS );
 418
 419                 if ( $num === 0 ) {
 420                         if ( $textStatus ) {
 421                                 $out->addHTML( '<div class="error">' .
 422                                         $textStatus->getMessage( 'search-error' ) . '</div>' );
 423                         } else {
 424                                 $this->showCreateLink( $title, $num, $titleMatches, $textMatches );
 425                                 $out->wrapWikiMsg( "<p class=\"mw-search-nonefound\">\n$1</p>",
 426                                         [ $hasOtherResults ? 'search-nonefound-thiswiki' : 'search-nonefound',
 427                                                         wfEscapeWikiText( $term )
 428                                         ] );
 429                         }
 430                 }
 431
 432                 if ( $hasOtherResults ) {
 433                         foreach ( $textMatches->getInterwikiResults( SearchResultSet::INLINE_RESULTS )
 434                                                 as $interwiki => $interwikiResult ) {
 435                                 if ( $interwikiResult instanceof Status || $interwikiResult->numRows() == 0 ) {
 436                                         // ignore bad interwikis for now
 437                                         continue;
 438                                 }
 439                                 // TODO: wiki header
 440                                 $out->addHTML( $this->showMatches( $interwikiResult, $interwiki ) );
 441                         }
 442                 }
 443
 444                 if ( $textMatches ) {
 445                         $textMatches->free();
 446                 }
 447
 448                 $out->addHTML( '<div class="mw-search-visualclear"></div>' );
 449
 450                 if ( $prevnext ) {
 451                         $out->addHTML( "<p class='mw-search-pager-bottom'>{$prevnext}</p>\n" );
 452                 }
 453
 454                 $out->addHTML( "</div>" );
 455
 456                 Hooks::run( 'SpecialSearchResultsAppend', [ $this, $out, $term ] );
 457
 458         }
 459
 460         /**
 461          * Produce wiki header for interwiki results
 462          * @param string $interwiki Interwiki name
 463          * @param SearchResultSet $interwikiResult The result set
 464          * @return string
 465          */
 466         protected function interwikiHeader( $interwiki, $interwikiResult ) {
 467                 // TODO: we need to figure out how to name wikis correctly
 468                 $wikiMsg = $this->msg( 'search-interwiki-results-' . $interwiki )->parse();
 469                 return "<p class=\"mw-search-interwiki-header mw-search-visualclear\">\n$wikiMsg</p>";
 470         }
 471
 472         /**
 473          * Decide if the suggested query should be run, and it's results returned
 474          * instead of the provided $textMatches
 475          *
 476          * @param SearchResultSet $textMatches The results of a users query
 477          * @return bool
 478          */
 479         protected function shouldRunSuggestedQuery( SearchResultSet $textMatches ) {
 480                 if ( !$this->runSuggestion ||
 481                         !$textMatches->hasSuggestion() ||
 482                         $textMatches->numRows() > 0 ||
 483                         $textMatches->searchContainedSyntax()
 484                 ) {
 485                         return false;
 486                 }
 487
 488                 return $this->getConfig()->get( 'SearchRunSuggestedQuery' );
 489         }
 490
 491         /**
 492          * Generates HTML shown to the user when we have a suggestion about a query
 493          * that might give more results than their current query.
 494          */
 495         protected function getDidYouMeanHtml( SearchResultSet $textMatches ) {
 496                 # mirror Go/Search behavior of original request ..
 497                 $params = [ 'search' => $textMatches->getSuggestionQuery() ];
 498                 if ( $this->fulltext === null ) {
 499                         $params['fulltext'] = 'Search';
 500                 } else {
 501                         $params['fulltext'] = $this->fulltext;
 502                 }
 503                 $stParams = array_merge( $params, $this->powerSearchOptions() );
 504
 505                 $suggest = Linker::linkKnown(
 506                         $this->getPageTitle(),
 507                         $textMatches->getSuggestionSnippet() ?: null,
 508                         [ 'id' => 'mw-search-DYM-suggestion' ],
 509                         $stParams
 510                 );
 511
 512                 # HTML of did you mean... search suggestion link
 513                 return Html::rawElement(
 514                         'div',
 515                         [ 'class' => 'searchdidyoumean' ],
 516                         $this->msg( 'search-suggest' )->rawParams( $suggest )->parse()
 517                 );
 518         }
 519
 520         /**
 521          * Generates HTML shown to user when their query has been internally rewritten,
 522          * and the results of the rewritten query are being returned.
 523          *
 524          * @param string $term The users search input
 525          * @param SearchResultSet $textMatches The response to the users initial search request
 526          * @return string HTML linking the user to their original $term query, and the one
 527          *  suggested by $textMatches.
 528          */
 529         protected function getDidYouMeanRewrittenHtml( $term, SearchResultSet $textMatches ) {
 530                 // Showing results for '$rewritten'
 531                 // Search instead for '$orig'
 532
 533                 $params = [ 'search' => $textMatches->getQueryAfterRewrite() ];
 534                 if ( $this->fulltext === null ) {
 535                         $params['fulltext'] = 'Search';
 536                 } else {
 537                         $params['fulltext'] = $this->fulltext;
 538                 }
 539                 $stParams = array_merge( $params, $this->powerSearchOptions() );
 540
 541                 $rewritten = Linker::linkKnown(
 542                         $this->getPageTitle(),
 543                         $textMatches->getQueryAfterRewriteSnippet() ?: null,
 544                         [ 'id' => 'mw-search-DYM-rewritten' ],
 545                         $stParams
 546                 );
 547
 548                 $stParams['search'] = $term;
 549                 $stParams['runsuggestion'] = 0;
 550                 $original = Linker::linkKnown(
 551                         $this->getPageTitle(),
 552                         htmlspecialchars( $term ),
 553                         [ 'id' => 'mw-search-DYM-original' ],
 554                         $stParams
 555                 );
 556
 557                 return Html::rawElement(
 558                         'div',
 559                         [ 'class' => 'searchdidyoumean' ],
 560                         $this->msg( 'search-rewritten' )->rawParams( $rewritten, $original )->escaped()
 561                 );
 562         }
 563
 564         /**
 565          * @param Title $title
 566          * @param int $num The number of search results found
 567          * @param null|SearchResultSet $titleMatches Results from title search
 568          * @param null|SearchResultSet $textMatches Results from text search
 569          */
 570         protected function showCreateLink( $title, $num, $titleMatches, $textMatches ) {
 571                 // show direct page/create link if applicable
 572
 573                 // Check DBkey !== '' in case of fragment link only.
 574                 if ( is_null( $title ) || $title->getDBkey() === ''
 575                         || ( $titleMatches !== null && $titleMatches->searchContainedSyntax() )
 576                         || ( $textMatches !== null && $textMatches->searchContainedSyntax() )
 577                 ) {
 578                         // invalid title
 579                         // preserve the paragraph for margins etc...
 580                         $this->getOutput()->addHTML( '<p></p>' );
 581
 582                         return;
 583                 }
 584
 585                 $messageName = 'searchmenu-new-nocreate';
 586                 $linkClass = 'mw-search-createlink';
 587
 588                 if ( !$title->isExternal() ) {
 589                         if ( $title->isKnown() ) {
 590                                 $messageName = 'searchmenu-exists';
 591                                 $linkClass = 'mw-search-exists';
 592                         } elseif ( $title->quickUserCan( 'create', $this->getUser() ) ) {
 593                                 $messageName = 'searchmenu-new';
 594                         }
 595                 }
 596
 597                 $params = [
 598                         $messageName,
 599                         wfEscapeWikiText( $title->getPrefixedText() ),
 600                         Message::numParam( $num )
 601                 ];
 602                 Hooks::run( 'SpecialSearchCreateLink', [ $title, &$params ] );
 603
 604                 // Extensions using the hook might still return an empty $messageName
 605                 if ( $messageName ) {
 606                         $this->getOutput()->wrapWikiMsg( "<p class=\"$linkClass\">\n$1</p>", $params );
 607                 } else {
 608                         // preserve the paragraph for margins etc...
 609                         $this->getOutput()->addHTML( '<p></p>' );
 610                 }
 611         }
 612
 613         /**
 614          * @param string $term
 615          */
 616         protected function setupPage( $term ) {
 617                 $out = $this->getOutput();
 618                 if ( strval( $term ) !== '' ) {
 619                         $out->setPageTitle( $this->msg( 'searchresults' ) );
 620                         $out->setHTMLTitle( $this->msg( 'pagetitle' )
 621                                 ->rawParams( $this->msg( 'searchresults-title' )->rawParams( $term )->text() )
 622                                 ->inContentLanguage()->text()
 623                         );
 624                 }
 625                 // add javascript specific to special:search
 626                 $out->addModules( 'mediawiki.special.search' );
 627         }
 628
 629         /**
 630          * Return true if current search is a power (advanced) search
 631          *
 632          * @return bool
 633          */
 634         protected function isPowerSearch() {
 635                 return $this->profile === 'advanced';
 636         }
 637
 638         /**
 639          * Extract "power search" namespace settings from the request object,
 640          * returning a list of index numbers to search.
 641          *
 642          * @param WebRequest $request
 643          * @return array
 644          */
 645         protected function powerSearch( &$request ) {
 646                 $arr = [];
 647                 foreach ( $this->searchConfig->searchableNamespaces() as $ns => $name ) {
 648                         if ( $request->getCheck( 'ns' . $ns ) ) {
 649                                 $arr[] = $ns;
 650                         }
 651                 }
 652
 653                 return $arr;
 654         }
 655
 656         /**
 657          * Reconstruct the 'power search' options for links
 658          *
 659          * @return array
 660          */
 661         protected function powerSearchOptions() {
 662                 $opt = [];
 663                 if ( !$this->isPowerSearch() ) {
 664                         $opt['profile'] = $this->profile;
 665                 } else {
 666                         foreach ( $this->namespaces as $n ) {
 667                                 $opt['ns' . $n] = 1;
 668                         }
 669                 }
 670
 671                 return $opt + $this->extraParams;
 672         }
 673
 674         /**
 675          * Save namespace preferences when we're supposed to
 676          *
 677          * @return bool Whether we wrote something
 678          */
 679         protected function saveNamespaces() {
 680                 $user = $this->getUser();
 681                 $request = $this->getRequest();
 682
 683                 if ( $user->isLoggedIn() &&
 684                         $user->matchEditToken(
 685                                 $request->getVal( 'nsRemember' ),
 686                                 'searchnamespace',
 687                                 $request
 688                         ) && !wfReadOnly()
 689                 ) {
 690                         // Reset namespace preferences: namespaces are not searched
 691                         // when they're not mentioned in the URL parameters.
 692                         foreach ( MWNamespace::getValidNamespaces() as $n ) {
 693                                 $user->setOption( 'searchNs' . $n, false );
 694                         }
 695                         // The request parameters include all the namespaces to be searched.
 696                         // Even if they're the same as an existing profile, they're not eaten.
 697                         foreach ( $this->namespaces as $n ) {
 698                                 $user->setOption( 'searchNs' . $n, true );
 699                         }
 700
 701                         DeferredUpdates::addCallableUpdate( function () use ( $user ) {
 702                                 $user->saveSettings();
 703                         } );
 704
 705                         return true;
 706                 }
 707
 708                 return false;
 709         }
 710
 711         /**
 712          * Show whole set of results
 713          *
 714          * @param SearchResultSet $matches
 715          * @param string $interwiki Interwiki name
 716          *
 717          * @return string
 718          */
 719         protected function showMatches( &$matches, $interwiki = null ) {
 720                 global $wgContLang;
 721
 722                 $terms = $wgContLang->convertForSearchResult( $matches->termMatches() );
 723                 $out = '';
 724                 $result = $matches->next();
 725                 $pos = $this->offset;
 726
 727                 if ( $result && $interwiki ) {
 728                         $out .= $this->interwikiHeader( $interwiki, $result );
 729                 }
 730
 731                 $out .= "<ul class='mw-search-results'>\n";
 732                 while ( $result ) {
 733                         $out .= $this->showHit( $result, $terms, $pos++ );
 734                         $result = $matches->next();
 735                 }
 736                 $out .= "</ul>\n";
 737
 738                 // convert the whole thing to desired language variant
 739                 $out = $wgContLang->convert( $out );
 740
 741                 return $out;
 742         }
 743
 744         /**
 745          * Format a single hit result
 746          *
 747          * @param SearchResult $result
 748          * @param array $terms Terms to highlight
 749          * @param int $position Position within the search results, including offset.
 750          *
 751          * @return string
 752          */
 753         protected function showHit( $result, $terms, $position ) {
 754
 755                 if ( $result->isBrokenTitle() ) {
 756                         return '';
 757                 }
 758
 759                 $title = $result->getTitle();
 760
 761                 $titleSnippet = $result->getTitleSnippet();
 762
 763                 if ( $titleSnippet == '' ) {
 764                         $titleSnippet = null;
 765                 }
 766
 767                 $link_t = clone $title;
 768                 $query = [];
 769
 770                 Hooks::run( 'ShowSearchHitTitle',
 771                         [ &$link_t, &$titleSnippet, $result, $terms, $this, &$query ] );
 772
 773                 $link = Linker::linkKnown(
 774                         $link_t,
 775                         $titleSnippet,
 776                         [ 'data-serp-pos' => $position ], // HTML attributes
 777                         $query
 778                 );
 779
 780                 // If page content is not readable, just return the title.
 781                 // This is not quite safe, but better than showing excerpts from non-readable pages
 782                 // Note that hiding the entry entirely would screw up paging.
 783                 if ( !$title->userCan( 'read', $this->getUser() ) ) {
 784                         return "<li>{$link}</li>\n";
 785                 }
 786
 787                 // If the page doesn't *exist*... our search index is out of date.
 788                 // The least confusing at this point is to drop the result.
 789                 // You may get less results, but... oh well. :P
 790                 if ( $result->isMissingRevision() ) {
 791                         return '';
 792                 }
 793
 794                 // format redirects / relevant sections
 795                 $redirectTitle = $result->getRedirectTitle();
 796                 $redirectText = $result->getRedirectSnippet();
 797                 $sectionTitle = $result->getSectionTitle();
 798                 $sectionText = $result->getSectionSnippet();
 799                 $categorySnippet = $result->getCategorySnippet();
 800
 801                 $redirect = '';
 802                 if ( !is_null( $redirectTitle ) ) {
 803                         if ( $redirectText == '' ) {
 804                                 $redirectText = null;
 805                         }
 806
 807                         $redirect = "<span class='searchalttitle'>" .
 808                                 $this->msg( 'search-redirect' )->rawParams(
 809                                         Linker::linkKnown( $redirectTitle, $redirectText ) )->text() .
 810                                 "</span>";
 811                 }
 812
 813                 $section = '';
 814                 if ( !is_null( $sectionTitle ) ) {
 815                         if ( $sectionText == '' ) {
 816                                 $sectionText = null;
 817                         }
 818
 819                         $section = "<span class='searchalttitle'>" .
 820                                 $this->msg( 'search-section' )->rawParams(
 821                                         Linker::linkKnown( $sectionTitle, $sectionText ) )->text() .
 822                                 "</span>";
 823                 }
 824
 825                 $category = '';
 826                 if ( $categorySnippet ) {
 827                         $category = "<span class='searchalttitle'>" .
 828                                 $this->msg( 'search-category' )->rawParams( $categorySnippet )->text() .
 829                                 "</span>";
 830                 }
 831
 832                 // format text extract
 833                 $extract = "<div class='searchresult'>" . $result->getTextSnippet( $terms ) . "</div>";
 834
 835                 $lang = $this->getLanguage();
 836
 837                 // format description
 838                 $byteSize = $result->getByteSize();
 839                 $wordCount = $result->getWordCount();
 840                 $timestamp = $result->getTimestamp();
 841                 $size = $this->msg( 'search-result-size', $lang->formatSize( $byteSize ) )
 842                         ->numParams( $wordCount )->escaped();
 843
 844                 if ( $title->getNamespace() == NS_CATEGORY ) {
 845                         $cat = Category::newFromTitle( $title );
 846                         $size = $this->msg( 'search-result-category-size' )
 847                                 ->numParams( $cat->getPageCount(), $cat->getSubcatCount(), $cat->getFileCount() )
 848                                 ->escaped();
 849                 }
 850
 851                 $date = $lang->userTimeAndDate( $timestamp, $this->getUser() );
 852
 853                 $fileMatch = '';
 854                 // Include a thumbnail for media files...
 855                 if ( $title->getNamespace() == NS_FILE ) {
 856                         $img = $result->getFile();
 857                         $img = $img ?: wfFindFile( $title );
 858                         if ( $result->isFileMatch() ) {
 859                                 $fileMatch = "<span class='searchalttitle'>" .
 860                                         $this->msg( 'search-file-match' )->escaped() . "</span>";
 861                         }
 862                         if ( $img ) {
 863                                 $thumb = $img->transform( [ 'width' => 120, 'height' => 120 ] );
 864                                 if ( $thumb ) {
 865                                         $desc = $this->msg( 'parentheses' )->rawParams( $img->getShortDesc() )->escaped();
 866                                         // Float doesn't seem to interact well with the bullets.
 867                                         // Table messes up vertical alignment of the bullets.
 868                                         // Bullets are therefore disabled (didn't look great anyway).
 869                                         return "<li>" .
 870                                                 '<table class="searchResultImage">' .
 871                                                 '<tr>' .
 872                                                 '<td style="width: 120px; text-align: center; vertical-align: top;">' .
 873                                                 $thumb->toHtml( [ 'desc-link' => true ] ) .
 874                                                 '</td>' .
 875                                                 '<td style="vertical-align: top;">' .
 876                                                 "{$link} {$redirect} {$category} {$section} {$fileMatch}" .
 877                                                 $extract .
 878                                                 "<div class='mw-search-result-data'>{$desc} - {$date}</div>" .
 879                                                 '</td>' .
 880                                                 '</tr>' .
 881                                                 '</table>' .
 882                                                 "</li>\n";
 883                                 }
 884                         }
 885                 }
 886
 887                 $html = null;
 888
 889                 $score = '';
 890                 $related = '';
 891                 if ( Hooks::run( 'ShowSearchHit', [
 892                         $this, $result, $terms,
 893                         &$link, &$redirect, &$section, &$extract,
 894                         &$score, &$size, &$date, &$related,
 895                         &$html
 896                 ] ) ) {
 897                         $html = "<li><div class='mw-search-result-heading'>" .
 898                                 "{$link} {$redirect} {$category} {$section} {$fileMatch}</div> {$extract}\n" .
 899                                 "<div class='mw-search-result-data'>{$size} - {$date}</div>" .
 900                                 "</li>\n";
 901                 }
 902
 903                 return $html;
 904         }
 905
 906         /**
 907          * Extract custom captions from search-interwiki-custom message
 908          */
 909         protected function getCustomCaptions() {
 910                 if ( is_null( $this->customCaptions ) ) {
 911                         $this->customCaptions = [];
 912                         // format per line <iwprefix>:<caption>
 913                         $customLines = explode( "\n", $this->msg( 'search-interwiki-custom' )->text() );
 914                         foreach ( $customLines as $line ) {
 915                                 $parts = explode( ":", $line, 2 );
 916                                 if ( count( $parts ) == 2 ) { // validate line
 917                                         $this->customCaptions[$parts[0]] = $parts[1];
 918                                 }
 919                         }
 920                 }
 921         }
 922
 923         /**
 924          * Show results from other wikis
 925          *
 926          * @param SearchResultSet|array $matches
 927          * @param string $query
 928          *
 929          * @return string
 930          */
 931         protected function showInterwiki( $matches, $query ) {
 932                 global $wgContLang;
 933
 934                 $out = "<div id='mw-search-interwiki'><div id='mw-search-interwiki-caption'>" .
 935                         $this->msg( 'search-interwiki-caption' )->text() . "</div>\n";
 936                 $out .= "<ul class='mw-search-iwresults'>\n";
 937
 938                 // work out custom project captions
 939                 $this->getCustomCaptions();
 940
 941                 if ( !is_array( $matches ) ) {
 942                         $matches = [ $matches ];
 943                 }
 944
 945                 foreach ( $matches as $set ) {
 946                         $prev = null;
 947                         $result = $set->next();
 948                         while ( $result ) {
 949                                 $out .= $this->showInterwikiHit( $result, $prev, $query );
 950                                 $prev = $result->getInterwikiPrefix();
 951                                 $result = $set->next();
 952                         }
 953                 }
 954
 955                 // @todo Should support paging in a non-confusing way (not sure how though, maybe via ajax)..
 956                 $out .= "</ul></div>\n";
 957
 958                 // convert the whole thing to desired language variant
 959                 $out = $wgContLang->convert( $out );
 960
 961                 return $out;
 962         }
 963
 964         /**
 965          * Show single interwiki link
 966          *
 967          * @param SearchResult $result
 968          * @param string $lastInterwiki
 969          * @param string $query
 970          *
 971          * @return string
 972          */
 973         protected function showInterwikiHit( $result, $lastInterwiki, $query ) {
 974
 975                 if ( $result->isBrokenTitle() ) {
 976                         return '';
 977                 }
 978
 979                 $title = $result->getTitle();
 980
 981                 $titleSnippet = $result->getTitleSnippet();
 982
 983                 if ( $titleSnippet == '' ) {
 984                         $titleSnippet = null;
 985                 }
 986
 987                 $link = Linker::linkKnown(
 988                         $title,
 989                         $titleSnippet
 990                 );
 991
 992                 // format redirect if any
 993                 $redirectTitle = $result->getRedirectTitle();
 994                 $redirectText = $result->getRedirectSnippet();
 995                 $redirect = '';
 996                 if ( !is_null( $redirectTitle ) ) {
 997                         if ( $redirectText == '' ) {
 998                                 $redirectText = null;
 999                         }
1000
1001                         $redirect = "<span class='searchalttitle'>" .
1002                                 $this->msg( 'search-redirect' )->rawParams(
1003                                         Linker::linkKnown( $redirectTitle, $redirectText ) )->text() .
1004                                 "</span>";
1005                 }
1006
1007                 $out = "";
1008                 // display project name
1009                 if ( is_null( $lastInterwiki ) || $lastInterwiki != $title->getInterwiki() ) {
1010                         if ( array_key_exists( $title->getInterwiki(), $this->customCaptions ) ) {
1011                                 // captions from 'search-interwiki-custom'
1012                                 $caption = $this->customCaptions[$title->getInterwiki()];
1013                         } else {
1014                                 // default is to show the hostname of the other wiki which might suck
1015                                 // if there are many wikis on one hostname
1016                                 $parsed = wfParseUrl( $title->getFullURL() );
1017                                 $caption = $this->msg( 'search-interwiki-default', $parsed['host'] )->text();
1018                         }
1019                         // "more results" link (special page stuff could be localized, but we might not know target lang)
1020                         $searchTitle = Title::newFromText( $title->getInterwiki() . ":Special:Search" );
1021                         $searchLink = Linker::linkKnown(
1022                                 $searchTitle,
1023                                 $this->msg( 'search-interwiki-more' )->text(),
1024                                 [],
1025                                 [
1026                                         'search' => $query,
1027                                         'fulltext' => 'Search'
1028                                 ]
1029                         );
1030                         $out .= "</ul><div class='mw-search-interwiki-project'><span class='mw-search-interwiki-more'>
1031                                 {$searchLink}</span>{$caption}</div>\n<ul>";
1032                 }
1033
1034                 $out .= "<li>{$link} {$redirect}</li>\n";
1035
1036                 return $out;
1037         }
1038
1039         /**
1040          * Generates the power search box at [[Special:Search]]
1041          *
1042          * @param string $term Search term
1043          * @param array $opts
1044          * @return string HTML form
1045          */
1046         protected function powerSearchBox( $term, $opts ) {
1047                 global $wgContLang;
1048
1049                 // Groups namespaces into rows according to subject
1050                 $rows = [];
1051                 foreach ( $this->searchConfig->searchableNamespaces() as $namespace => $name ) {
1052                         $subject = MWNamespace::getSubject( $namespace );
1053                         if ( !array_key_exists( $subject, $rows ) ) {
1054                                 $rows[$subject] = "";
1055                         }
1056
1057                         $name = $wgContLang->getConverter()->convertNamespace( $namespace );
1058                         if ( $name == '' ) {
1059                                 $name = $this->msg( 'blanknamespace' )->text();
1060                         }
1061
1062                         $rows[$subject] .=
1063                                 Xml::openElement( 'td' ) .
1064                                 Xml::checkLabel(
1065                                         $name,
1066                                         "ns{$namespace}",
1067                                         "mw-search-ns{$namespace}",
1068                                         in_array( $namespace, $this->namespaces )
1069                                 ) .
1070                                 Xml::closeElement( 'td' );
1071                 }
1072
1073                 $rows = array_values( $rows );
1074                 $numRows = count( $rows );
1075
1076                 // Lays out namespaces in multiple floating two-column tables so they'll
1077                 // be arranged nicely while still accommodating different screen widths
1078                 $namespaceTables = '';
1079                 for ( $i = 0; $i < $numRows; $i += 4 ) {
1080                         $namespaceTables .= Xml::openElement( 'table' );
1081
1082                         for ( $j = $i; $j < $i + 4 && $j < $numRows; $j++ ) {
1083                                 $namespaceTables .= Xml::tags( 'tr', null, $rows[$j] );
1084                         }
1085
1086                         $namespaceTables .= Xml::closeElement( 'table' );
1087                 }
1088
1089                 $showSections = [ 'namespaceTables' => $namespaceTables ];
1090
1091                 Hooks::run( 'SpecialSearchPowerBox', [ &$showSections, $term, $opts ] );
1092
1093                 $hidden = '';
1094                 foreach ( $opts as $key => $value ) {
1095                         $hidden .= Html::hidden( $key, $value );
1096                 }
1097
1098                 # Stuff to feed saveNamespaces()
1099                 $remember = '';
1100                 $user = $this->getUser();
1101                 if ( $user->isLoggedIn() ) {
1102                         $remember .= Xml::checkLabel(
1103                                 $this->msg( 'powersearch-remember' )->text(),
1104                                 'nsRemember',
1105                                 'mw-search-powersearch-remember',
1106                                 false,
1107                                 // The token goes here rather than in a hidden field so it
1108                                 // is only sent when necessary (not every form submission).
1109                                 [ 'value' => $user->getEditToken(
1110                                         'searchnamespace',
1111                                         $this->getRequest()
1112                                 ) ]
1113                         );
1114                 }
1115
1116                 // Return final output
1117                 return Xml::openElement( 'fieldset', [ 'id' => 'mw-searchoptions' ] ) .
1118                         Xml::element( 'legend', null, $this->msg( 'powersearch-legend' )->text() ) .
1119                         Xml::tags( 'h4', null, $this->msg( 'powersearch-ns' )->parse() ) .
1120                         Xml::element( 'div', [ 'id' => 'mw-search-togglebox' ], '', false ) .
1121                         Xml::element( 'div', [ 'class' => 'divider' ], '', false ) .
1122                         implode( Xml::element( 'div', [ 'class' => 'divider' ], '', false ), $showSections ) .
1123                         $hidden .
1124                         Xml::element( 'div', [ 'class' => 'divider' ], '', false ) .
1125                         $remember .
1126                         Xml::closeElement( 'fieldset' );
1127         }
1128
1129         /**
1130          * @return array
1131          */
1132         protected function getSearchProfiles() {
1133                 // Builds list of Search Types (profiles)
1134                 $nsAllSet = array_keys( $this->searchConfig->searchableNamespaces() );
1135                 $defaultNs = $this->searchConfig->defaultNamespaces();
1136                 $profiles = [
1137                         'default' => [
1138                                 'message' => 'searchprofile-articles',
1139                                 'tooltip' => 'searchprofile-articles-tooltip',
1140                                 'namespaces' => $defaultNs,
1141                                 'namespace-messages' => $this->searchConfig->namespacesAsText(
1142                                         $defaultNs
1143                                 ),
1144                         ],
1145                         'images' => [
1146                                 'message' => 'searchprofile-images',
1147                                 'tooltip' => 'searchprofile-images-tooltip',
1148                                 'namespaces' => [ NS_FILE ],
1149                         ],
1150                         'all' => [
1151                                 'message' => 'searchprofile-everything',
1152                                 'tooltip' => 'searchprofile-everything-tooltip',
1153                                 'namespaces' => $nsAllSet,
1154                         ],
1155                         'advanced' => [
1156                                 'message' => 'searchprofile-advanced',
1157                                 'tooltip' => 'searchprofile-advanced-tooltip',
1158                                 'namespaces' => self::NAMESPACES_CURRENT,
1159                         ]
1160                 ];
1161
1162                 Hooks::run( 'SpecialSearchProfiles', [ &$profiles ] );
1163
1164                 foreach ( $profiles as &$data ) {
1165                         if ( !is_array( $data['namespaces'] ) ) {
1166                                 continue;
1167                         }
1168                         sort( $data['namespaces'] );
1169                 }
1170
1171                 return $profiles;
1172         }
1173
1174         /**
1175          * @param string $term
1176          * @return string
1177          */
1178         protected function searchProfileTabs( $term ) {
1179                 $out = Html::element( 'div', [ 'class' => 'mw-search-visualclear' ] ) .
1180                         Xml::openElement( 'div', [ 'class' => 'mw-search-profile-tabs' ] );
1181
1182                 $bareterm = $term;
1183                 if ( $this->startsWithImage( $term ) ) {
1184                         // Deletes prefixes
1185                         $bareterm = substr( $term, strpos( $term, ':' ) + 1 );
1186                 }
1187
1188                 $profiles = $this->getSearchProfiles();
1189                 $lang = $this->getLanguage();
1190
1191                 // Outputs XML for Search Types
1192                 $out .= Xml::openElement( 'div', [ 'class' => 'search-types' ] );
1193                 $out .= Xml::openElement( 'ul' );
1194                 foreach ( $profiles as $id => $profile ) {
1195                         if ( !isset( $profile['parameters'] ) ) {
1196                                 $profile['parameters'] = [];
1197                         }
1198                         $profile['parameters']['profile'] = $id;
1199
1200                         $tooltipParam = isset( $profile['namespace-messages'] ) ?
1201                                 $lang->commaList( $profile['namespace-messages'] ) : null;
1202                         $out .= Xml::tags(
1203                                 'li',
1204                                 [
1205                                         'class' => $this->profile === $id ? 'current' : 'normal'
1206                                 ],
1207                                 $this->makeSearchLink(
1208                                         $bareterm,
1209                                         [],
1210                                         $this->msg( $profile['message'] )->text(),
1211                                         $this->msg( $profile['tooltip'], $tooltipParam )->text(),
1212                                         $profile['parameters']
1213                                 )
1214                         );
1215                 }
1216                 $out .= Xml::closeElement( 'ul' );
1217                 $out .= Xml::closeElement( 'div' );
1218                 $out .= Xml::element( 'div', [ 'style' => 'clear:both' ], '', false );
1219                 $out .= Xml::closeElement( 'div' );
1220
1221                 return $out;
1222         }
1223
1224         /**
1225          * @param string $term Search term
1226          * @return string
1227          */
1228         protected function searchOptions( $term ) {
1229                 $out = '';
1230                 $opts = [];
1231                 $opts['profile'] = $this->profile;
1232
1233                 if ( $this->isPowerSearch() ) {
1234                         $out .= $this->powerSearchBox( $term, $opts );
1235                 } else {
1236                         $form = '';
1237                         Hooks::run( 'SpecialSearchProfileForm', [ $this, &$form, $this->profile, $term, $opts ] );
1238                         $out .= $form;
1239                 }
1240
1241                 return $out;
1242         }
1243
1244         /**
1245          * @param string $term
1246          * @param int $resultsShown
1247          * @param int $totalNum
1248          * @return string
1249          */
1250         protected function shortDialog( $term, $resultsShown, $totalNum ) {
1251                 $searchWidget = new MediaWiki\Widget\SearchInputWidget( [
1252                         'id' => 'searchText',
1253                         'name' => 'search',
1254                         'autofocus' => trim( $term ) === '',
1255                         'value' => $term,
1256                         'dataLocation' => 'content',
1257                         'infusable' => true,
1258                 ] );
1259
1260                 $layout = new OOUI\ActionFieldLayout( $searchWidget, new OOUI\ButtonInputWidget( [
1261                         'type' => 'submit',
1262                         'label' => $this->msg( 'searchbutton' )->text(),
1263                         'flags' => [ 'progressive', 'primary' ],
1264                 ] ), [
1265                         'align' => 'top',
1266                 ] );
1267
1268                 $out =
1269                         Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() ) .
1270                         Html::hidden( 'profile', $this->profile ) .
1271                         Html::hidden( 'fulltext', 'Search' ) .
1272                         $layout;
1273
1274                 // Results-info
1275                 if ( $totalNum > 0 && $this->offset < $totalNum ) {
1276                         $top = $this->msg( 'search-showingresults' )
1277                                 ->numParams( $this->offset + 1, $this->offset + $resultsShown, $totalNum )
1278                                 ->numParams( $resultsShown )
1279                                 ->parse();
1280                         $out .= Xml::tags( 'div', [ 'class' => 'results-info' ], $top );
1281                 }
1282
1283                 return $out;
1284         }
1285
1286         /**
1287          * Make a search link with some target namespaces
1288          *
1289          * @param string $term
1290          * @param array $namespaces Ignored
1291          * @param string $label Link's text
1292          * @param string $tooltip Link's tooltip
1293          * @param array $params Query string parameters
1294          * @return string HTML fragment
1295          */
1296         protected function makeSearchLink( $term, $namespaces, $label, $tooltip, $params = [] ) {
1297                 $opt = $params;
1298                 foreach ( $namespaces as $n ) {
1299                         $opt['ns' . $n] = 1;
1300                 }
1301
1302                 $stParams = array_merge(
1303                         [
1304                                 'search' => $term,
1305                                 'fulltext' => $this->msg( 'search' )->text()
1306                         ],
1307                         $opt
1308                 );
1309
1310                 return Xml::element(
1311                         'a',
1312                         [
1313                                 'href' => $this->getPageTitle()->getLocalURL( $stParams ),
1314                                 'title' => $tooltip
1315                         ],
1316                         $label
1317                 );
1318         }
1319
1320         /**
1321          * Check if query starts with image: prefix
1322          *
1323          * @param string $term The string to check
1324          * @return bool
1325          */
1326         protected function startsWithImage( $term ) {
1327                 global $wgContLang;
1328
1329                 $parts = explode( ':', $term );
1330                 if ( count( $parts ) > 1 ) {
1331                         return $wgContLang->getNsIndex( $parts[0] ) == NS_FILE;
1332                 }
1333
1334                 return false;
1335         }
1336
1337         /**
1338          * Check if query starts with all: prefix
1339          *
1340          * @param string $term The string to check
1341          * @return bool
1342          */
1343         protected function startsWithAll( $term ) {
1344
1345                 $allkeyword = $this->msg( 'searchall' )->inContentLanguage()->text();
1346
1347                 $parts = explode( ':', $term );
1348                 if ( count( $parts ) > 1 ) {
1349                         return $parts[0] == $allkeyword;
1350                 }
1351
1352                 return false;
1353         }
1354
1355         /**
1356          * @since 1.18
1357          *
1358          * @return SearchEngine
1359          */
1360         public function getSearchEngine() {
1361                 if ( $this->searchEngine === null ) {
1362                         $this->searchEngine = $this->searchEngineType ?
1363                                 MediaWikiServices::getInstance()->getSearchEngineFactory()->create( $this->searchEngineType ) :
1364                                 MediaWikiServices::getInstance()->newSearchEngine();
1365                 }
1366
1367                 return $this->searchEngine;
1368         }
1369
1370         /**
1371          * Current search profile.
1372          * @return null|string
1373          */
1374         function getProfile() {
1375                 return $this->profile;
1376         }
1377
1378         /**
1379          * Current namespaces.
1380          * @return array
1381          */
1382         function getNamespaces() {
1383                 return $this->namespaces;
1384         }
1385
1386         /**
1387          * Users of hook SpecialSearchSetupEngine can use this to
1388          * add more params to links to not lose selection when
1389          * user navigates search results.
1390          * @since 1.18
1391          *
1392          * @param string $key
1393          * @param mixed $value
1394          */
1395         public function setExtraParam( $key, $value ) {
1396                 $this->extraParams[$key] = $value;
1397         }
1398
1399         protected function getGroupName() {
1400                 return 'pages';
1401         }
1402 }