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