includes/SpecialSearch.php

   1 <?php
   2 # Copyright (C) 2004 Brion Vibber <brion@pobox.com>
   3 # http://www.mediawiki.org/
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 2 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License along
  16 # with this program; if not, write to the Free Software Foundation, Inc.,
  17 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18 # http://www.gnu.org/copyleft/gpl.html
  19
  20 /**
  21  * Run text & title search and display the output
  22  * @addtogroup SpecialPage
  23  */
  24
  25 /**
  26  * Entry point
  27  *
  28  * @param $par String: (default '')
  29  */
  30 function wfSpecialSearch( $par = '' ) {
  31         global $wgRequest, $wgUser;
  32
  33         $search = str_replace( array('_', "\n"), " ",
  34                 $wgRequest->getText( 'search', $par ) );
  35         $searchPage = new SpecialSearch( $wgRequest, $wgUser );
  36         if( $wgRequest->getVal( 'fulltext' ) ||
  37                 !is_null( $wgRequest->getVal( 'offset' ) ) ||
  38                 !is_null ($wgRequest->getVal( 'searchx' ) ) ) {
  39                 $searchPage->showResults( $search );
  40         } else {
  41                 $searchPage->goResult( $search );
  42         }
  43 }
  44
  45 /**
  46  * implements Special:Search - Run text & title search and display the output
  47  * @addtogroup SpecialPage
  48  */
  49 class SpecialSearch {
  50
  51         /**
  52          * Set up basic search parameters from the request and user settings.
  53          * Typically you'll pass $wgRequest and $wgUser.
  54          *
  55          * @param WebRequest $request
  56          * @param User $user
  57          * @public
  58          */
  59         function SpecialSearch( &$request, &$user ) {
  60                 list( $this->limit, $this->offset ) = $request->getLimitOffset( 20, 'searchlimit' );
  61
  62                 $this->namespaces = $this->powerSearch( $request );
  63                 if( empty( $this->namespaces ) ) {
  64                         $this->namespaces = $this->userNamespaces( $user );
  65                 }
  66
  67                 $this->searchRedirects = $request->getcheck( 'redirs' ) ? true : false;
  68         }
  69
  70         /**
  71          * If an exact title match can be found, jump straight ahead to it.
  72          * @param string $term
  73          * @public
  74          */
  75         function goResult( $term ) {
  76                 global $wgOut;
  77                 global $wgGoToEdit;
  78
  79                 $this->setupPage( $term );
  80
  81                 # Try to go to page as entered.
  82                 $t = Title::newFromText( $term );
  83
  84                 # If the string cannot be used to create a title
  85                 if( is_null( $t ) ){
  86                         return $this->showResults( $term );
  87                 }
  88
  89                 # If there's an exact or very near match, jump right there.
  90                 $t = SearchEngine::getNearMatch( $term );
  91                 if( !is_null( $t ) ) {
  92                         $wgOut->redirect( $t->getFullURL() );
  93                         return;
  94                 }
  95
  96                 # No match, generate an edit URL
  97                 $t = Title::newFromText( $term );
  98                 if( ! is_null( $t ) ) {
  99                         wfRunHooks( 'SpecialSearchNogomatch', array( &$t ) );
 100                         # If the feature is enabled, go straight to the edit page
 101                         if ( $wgGoToEdit ) {
 102                                 $wgOut->redirect( $t->getFullURL( 'action=edit' ) );
 103                                 return;
 104                         }
 105                 }
 106                 if( $t->quickUserCan( 'create' ) && $t->quickUserCan( 'edit' ) ) {
 107                         $wgOut->addWikiMsg( 'noexactmatch', wfEscapeWikiText( $term ) );
 108                 } else {
 109                         $wgOut->addWikiMsg( 'noexactmatch-nocreate', wfEscapeWikiText( $term ) );
 110                 }
 111
 112                 return $this->showResults( $term );
 113         }
 114
 115         /**
 116          * @param string $term
 117          * @public
 118          */
 119         function showResults( $term ) {
 120                 $fname = 'SpecialSearch::showResults';
 121                 wfProfileIn( $fname );
 122
 123                 $this->setupPage( $term );
 124
 125                 global $wgOut;
 126                 $wgOut->addWikiMsg( 'searchresulttext' );
 127
 128                 if( '' === trim( $term ) ) {
 129                         // Empty query -- straight view of search form
 130                         $wgOut->setSubtitle( '' );
 131                         $wgOut->addHTML( $this->powerSearchBox( $term ) );
 132                         $wgOut->addHTML( $this->powerSearchFocus() );
 133                         wfProfileOut( $fname );
 134                         return;
 135                 }
 136
 137                 global $wgDisableTextSearch;
 138                 if ( $wgDisableTextSearch ) {
 139                         global $wgForwardSearchUrl;
 140                         if( $wgForwardSearchUrl ) {
 141                                 $url = str_replace( '$1', urlencode( $term ), $wgForwardSearchUrl );
 142                                 $wgOut->redirect( $url );
 143                                 return;
 144                         }
 145                         global $wgInputEncoding;
 146                         $wgOut->addHTML(
 147                                 Xml::openElement( 'fieldset' ) .
 148                                 Xml::element( 'legend', null, wfMsg( 'search-external' ) ) .
 149                                 Xml::element( 'p', array( 'class' => 'mw-searchdisabled' ), wfMsg( 'searchdisabled' ) ) .
 150                                 wfMsg( 'googlesearch',
 151                                         htmlspecialchars( $term ),
 152                                         htmlspecialchars( $wgInputEncoding ),
 153                                         htmlspecialchars( wfMsg( 'searchbutton' ) )
 154                                 ) .
 155                                 Xml::closeElement( 'fieldset' )
 156                         );
 157                         wfProfileOut( $fname );
 158                         return;
 159                 }
 160
 161                 $wgOut->addHTML( $this->shortDialog( $term ) );
 162
 163                 $search = SearchEngine::create();
 164                 $search->setLimitOffset( $this->limit, $this->offset );
 165                 $search->setNamespaces( $this->namespaces );
 166                 $search->showRedirects = $this->searchRedirects;
 167                 $rewritten = $search->replacePrefixes($term);
 168
 169                 $titleMatches = $search->searchTitle( $rewritten );
 170
 171                 // Sometimes the search engine knows there are too many hits
 172                 if ($titleMatches instanceof SearchResultTooMany) {
 173                         $wgOut->addWikiText( '==' . wfMsg( 'toomanymatches' ) . "==\n" );
 174                         $wgOut->addHTML( $this->powerSearchBox( $term ) );
 175                         $wgOut->addHTML( $this->powerSearchFocus() );
 176                         wfProfileOut( $fname );
 177                         return;
 178                 }
 179                 $textMatches = $search->searchText( $rewritten );
 180
 181                 // did you mean...
 182                 if($textMatches && $textMatches->hasSuggestion()){
 183                         global $wgScript;
 184                         $fulltext = htmlspecialchars(wfMsg('search'));
 185                         $suggestLink = '<a href="'.$wgScript.'?title=Special:Search&amp;search='.
 186                                 urlencode($textMatches->getSuggestionQuery()).'&amp;fulltext='.$fulltext.'">'
 187                                 .$textMatches->getSuggestionSnippet().'</a>';
 188                         $wgOut->addHTML('<div class="searchdidyoumean">'.wfMsg('search-suggest',$suggestLink).'</div>');
 189                 }
 190
 191
 192                 $num = ( $titleMatches ? $titleMatches->numRows() : 0 )
 193                         + ( $textMatches ? $textMatches->numRows() : 0);
 194                 $totalNum = 0;
 195                 if($titleMatches && !is_null($titleMatches->getTotalHits()))
 196                         $totalNum += $titleMatches->getTotalHits();
 197                 if($textMatches && !is_null($textMatches->getTotalHits()))
 198                         $totalNum += $textMatches->getTotalHits();
 199                 if ( $num > 0 ) {
 200                         if ( $totalNum > 0 ){
 201                                 $top = wfMsgExt('showingresultstotal',array( 'parseinline' ), $this->offset+1, $this->offset+$num, $totalNum);
 202                         } elseif ( $num >= $this->limit ) {
 203                                 $top = wfShowingResults( $this->offset, $this->limit );
 204                         } else {
 205                                 $top = wfShowingResultsNum( $this->offset, $this->limit, $num );
 206                         }
 207                         $wgOut->addHTML( "<p>{$top}</p>\n" );
 208                 }
 209
 210                 if( $num || $this->offset ) {
 211                         $prevnext = wfViewPrevNext( $this->offset, $this->limit,
 212                                 SpecialPage::getTitleFor( 'Search' ),
 213                                 wfArrayToCGI(
 214                                         $this->powerSearchOptions(),
 215                                         array( 'search' => $term ) ),
 216                                         ($num < $this->limit) );
 217                         $wgOut->addHTML( "<p>{$prevnext}</p>\n" );
 218                         wfRunHooks( 'SpecialSearchResults', array( $term, $titleMatches, $textMatches ) );
 219                 } else {
 220                         wfRunHooks( 'SpecialSearchNoResults', array( $term ) );
 221                 }
 222
 223                 if( $titleMatches ) {
 224                         if( $titleMatches->numRows() ) {
 225                                 $wgOut->wrapWikiMsg( "==$1==\n", 'titlematches' );
 226                                 $wgOut->addHTML( $this->showMatches( $titleMatches ) );
 227                         } else {
 228                                 $wgOut->wrapWikiMsg( "==$1==\n", 'notitlematches' );
 229                         }
 230                         $titleMatches->free();
 231                 }
 232
 233                 if( $textMatches ) {
 234                         if( $textMatches->numRows() ) {
 235                                 if($titleMatches)
 236                                         $wgOut->wrapWikiMsg( "==$1==\n", 'textmatches' );
 237                                 else // if no title matches the heading is redundant
 238                                         $wgOut->addHTML("<hr/>");
 239                                 $wgOut->addHTML( $this->showMatches( $textMatches ) );
 240                         } elseif( $num == 0 ) {
 241                                 # Don't show the 'no text matches' if we received title matches
 242                                 $wgOut->wrapWikiMsg( "==$1==\n", 'notextmatches' );
 243                         }
 244                         $textMatches->free();
 245                 }
 246
 247                 if ( $num == 0 ) {
 248                         $wgOut->addWikiMsg( 'nonefound' );
 249                 }
 250                 if( $num || $this->offset ) {
 251                         $wgOut->addHTML( "<p>{$prevnext}</p>\n" );
 252                 }
 253                 $wgOut->addHTML( $this->powerSearchBox( $term ) );
 254                 wfProfileOut( $fname );
 255         }
 256
 257         #------------------------------------------------------------------
 258         # Private methods below this line
 259
 260         /**
 261          *
 262          */
 263         function setupPage( $term ) {
 264                 global $wgOut;
 265                 $wgOut->setPageTitle( wfMsg( 'searchresults' ) );
 266                 $subtitlemsg = ( Title::newFromText($term) ? 'searchsubtitle' : 'searchsubtitleinvalid' );
 267                 $wgOut->setSubtitle( $wgOut->parse( wfMsg( $subtitlemsg, wfEscapeWikiText($term) ) ) );
 268                 $wgOut->setArticleRelated( false );
 269                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 270         }
 271
 272         /**
 273          * Extract default namespaces to search from the given user's
 274          * settings, returning a list of index numbers.
 275          *
 276          * @param User $user
 277          * @return array
 278          * @private
 279          */
 280         function userNamespaces( &$user ) {
 281                 $arr = array();
 282                 foreach( SearchEngine::searchableNamespaces() as $ns => $name ) {
 283                         if( $user->getOption( 'searchNs' . $ns ) ) {
 284                                 $arr[] = $ns;
 285                         }
 286                 }
 287                 return $arr;
 288         }
 289
 290         /**
 291          * Extract "power search" namespace settings from the request object,
 292          * returning a list of index numbers to search.
 293          *
 294          * @param WebRequest $request
 295          * @return array
 296          * @private
 297          */
 298         function powerSearch( &$request ) {
 299                 $arr = array();
 300                 foreach( SearchEngine::searchableNamespaces() as $ns => $name ) {
 301                         if( $request->getCheck( 'ns' . $ns ) ) {
 302                                 $arr[] = $ns;
 303                         }
 304                 }
 305                 return $arr;
 306         }
 307
 308         /**
 309          * Reconstruct the 'power search' options for links
 310          * @return array
 311          * @private
 312          */
 313         function powerSearchOptions() {
 314                 $opt = array();
 315                 foreach( $this->namespaces as $n ) {
 316                         $opt['ns' . $n] = 1;
 317                 }
 318                 $opt['redirs'] = $this->searchRedirects ? 1 : 0;
 319                 return $opt;
 320         }
 321
 322
 323
 324         /**
 325          * @param SearchResultSet $matches
 326          * @param string $terms partial regexp for highlighting terms
 327          */
 328         function showMatches( &$matches ) {
 329                 $fname = 'SpecialSearch::showMatches';
 330                 wfProfileIn( $fname );
 331
 332                 global $wgContLang;
 333                 $tm = $wgContLang->convertForSearchResult( $matches->termMatches() );
 334                 $terms = implode( '|', $tm );
 335
 336                 $off = $this->offset + 1;
 337                 $out = "<ul start='{$off}' class='mw-search-results'>\n";
 338
 339                 while( $result = $matches->next() ) {
 340                         $out .= $this->showHit( $result, $terms );
 341                 }
 342                 $out .= "</ul>\n";
 343
 344                 // convert the whole thing to desired language variant
 345                 global $wgContLang;
 346                 $out = $wgContLang->convert( $out );
 347                 wfProfileOut( $fname );
 348                 return $out;
 349         }
 350
 351         /**
 352          * Format a single hit result
 353          * @param SearchResult $result
 354          * @param string $terms partial regexp for highlighting terms
 355          */
 356         function showHit( $result, $terms ) {
 357                 $fname = 'SpecialSearch::showHit';
 358                 wfProfileIn( $fname );
 359                 global $wgUser, $wgContLang, $wgLang;
 360
 361                 $t = $result->getTitle();
 362                 if( is_null( $t ) ) {
 363                         wfProfileOut( $fname );
 364                         return "<!-- Broken link in search result -->\n";
 365                 }
 366                 $sk = $wgUser->getSkin();
 367
 368                 //$contextlines = $wgUser->getOption( 'contextlines',  5 );
 369                 $contextlines = 2; // Hardcode this. Old defaults sucked. :)
 370                 $contextchars = $wgUser->getOption( 'contextchars', 50 );
 371
 372                 $link = $sk->makeKnownLinkObj( $t, $result->getTitleSnippet());
 373
 374                 //If page content is not readable, just return the title.
 375                 //This is not quite safe, but better than showing excerpts from non-readable pages
 376                 //Note that hiding the entry entirely would screw up paging.
 377                 if (!$t->userCanRead()) {
 378                         return "<li>{$link}</li>\n";
 379                 }
 380
 381                 $revision = Revision::newFromTitle( $t );
 382                 // If the page doesn't *exist*... our search index is out of date.
 383                 // The least confusing at this point is to drop the result.
 384                 // You may get less results, but... oh well. :P
 385                 if( !$revision ) {
 386                         return "<!-- missing page " .
 387                                 htmlspecialchars( $t->getPrefixedText() ) . "-->\n";
 388                 }
 389
 390                 if( is_null( $result->getScore() ) ) {
 391                         // Search engine doesn't report scoring info
 392                         $score = '';
 393                 } else {
 394                         $percent = sprintf( '%2.1f', $result->getScore() * 100 );
 395                         $score = wfMsg( 'search-result-score', $wgLang->formatNum( $percent ) )
 396                                 . ' - ';
 397                 }
 398
 399                 // try to fetch everything from the search engine backend
 400                 // then fill-in what couldn't be fetched
 401                 $extract = $result->getTextSnippet();
 402                 $byteSize = $result->getByteSize();
 403                 $wordCount = $result->getWordCount();
 404                 $timestamp = $result->getTimestamp();
 405                 $redirectTitle = $result->getRedirectTitle();
 406                 $redirectText = $result->getRedirectSnippet();
 407                 $sectionTitle = $result->getSectionTitle();
 408                 $sectionText = $result->getSectionSnippet();
 409
 410                 // fallback
 411                 if( is_null($extract) || is_null($wordCount) || is_null($byteSize) ){
 412                         $text = $revision->getText();
 413                         if( is_null($extract) )
 414                                 $extract = $this->extractText( $text, $terms, $contextlines, $contextchars );
 415                         if( is_null($byteSize) )
 416                                 $byteSize = strlen( $text );
 417                         if( is_null($wordCount) )
 418                                 $wordCount = str_word_count( $text );
 419                 }
 420                 if( is_null($timestamp) ){
 421                         $timestamp = $revision->getTimestamp();
 422                 }
 423
 424                 // format description
 425                 $size = wfMsgExt( 'search-result-size', array( 'parsemag', 'escape' ),
 426                         $sk->formatSize( $byteSize ),
 427                         $wordCount );
 428                 $date = $wgLang->timeanddate( $timestamp );
 429
 430                 // format redirects / sections
 431                 $redirect = '';
 432                 if( !is_null($redirectTitle) )
 433                         $redirect = "<span class='searchalttitle'>"
 434                                 .wfMsg('search-redirect',$sk->makeKnownLinkObj( $redirectTitle, $redirectText))
 435                                 ."</span>";
 436                 $section = '';
 437                 if( !is_null($sectionTitle) )
 438                         $section = "<span class='searchalttitle'>"
 439                                 .wfMsg('search-section', $sk->makeKnownLinkObj( $sectionTitle, $sectionText))
 440                                 ."</span>";
 441                 // wrap extract
 442                 $extract = "<div class='searchresult'>".$extract."</div>";
 443
 444                 // Include a thumbnail for media files...
 445                 if( $t->getNamespace() == NS_IMAGE ) {
 446                         $img = wfFindFile( $t );
 447                         if( $img ) {
 448                                 $thumb = $img->getThumbnail( 120, 120 );
 449                                 if( $thumb ) {
 450                                         $desc = $img->getShortDesc();
 451                                         wfProfileOut( $fname );
 452                                         // Ugly table. :D
 453                                         // Float doesn't seem to interact well with the bullets.
 454                                         // Table messes up vertical alignment of the bullet, but I'm
 455                                         // not sure what more I can do about that. :(
 456                                         return "<li>" .
 457                                                 '<table class="searchResultImage">' .
 458                                                 '<tr>' .
 459                                                 '<td width="120" align="center">' .
 460                                                 $thumb->toHtml( array( 'desc-link' => true ) ) .
 461                                                 '</td>' .
 462                                                 '<td valign="top">' .
 463                                                 $link .
 464                                                 $extract .
 465                                                 "<div class='mw-search-result-data'>{$score}{$desc} - {$date}</div>" .
 466                                                 '</td>' .
 467                                                 '</tr>' .
 468                                                 '</table>' .
 469                                                 "</li>\n";
 470                                 }
 471                         }
 472                 }
 473
 474                 wfProfileOut( $fname );
 475                 return "<li>{$link} {$redirect} {$section} {$extract}\n" .
 476                         "<div class='mw-search-result-data'>{$score}{$size} - {$date}</div>" .
 477                         "</li>\n";
 478
 479         }
 480
 481         private function extractText( $text, $terms, $contextlines, $contextchars ) {
 482                 global $wgLang, $wgContLang;
 483                 $fname = __METHOD__;
 484
 485                 $lines = explode( "\n", $text );
 486
 487                 $max = intval( $contextchars ) + 1;
 488                 $pat1 = "/(.*)($terms)(.{0,$max})/i";
 489
 490                 $lineno = 0;
 491
 492                 $extract = "";
 493                 wfProfileIn( "$fname-extract" );
 494                 foreach ( $lines as $line ) {
 495                         if ( 0 == $contextlines ) {
 496                                 break;
 497                         }
 498                         ++$lineno;
 499                         $m = array();
 500                         if ( ! preg_match( $pat1, $line, $m ) ) {
 501                                 continue;
 502                         }
 503                         --$contextlines;
 504                         $pre = $wgContLang->truncate( $m[1], -$contextchars, ' ... ' );
 505
 506                         if ( count( $m ) < 3 ) {
 507                                 $post = '';
 508                         } else {
 509                                 $post = $wgContLang->truncate( $m[3], $contextchars, ' ... ' );
 510                         }
 511
 512                         $found = $m[2];
 513
 514                         $line = htmlspecialchars( $pre . $found . $post );
 515                         $pat2 = '/(' . $terms . ")/i";
 516                         $line = preg_replace( $pat2,
 517                           "<span class='searchmatch'>\\1</span>", $line );
 518
 519                         $extract .= "${line}\n";
 520                 }
 521                 wfProfileOut( "$fname-extract" );
 522
 523                 return $extract;
 524         }
 525
 526         /**
 527          * Generates the power search box at bottom of [[Special:Search]]
 528          * @param $term string: search term
 529          * @return $out string: HTML form
 530          */
 531         function powerSearchBox( $term ) {
 532                 global $wgScript;
 533
 534                 $namespaces = '';
 535                 foreach( SearchEngine::searchableNamespaces() as $ns => $name ) {
 536                         $name = str_replace( '_', ' ', $name );
 537                         if( '' == $name ) {
 538                                 $name = wfMsg( 'blanknamespace' );
 539                         }
 540                         $namespaces .= Xml::openElement( 'span', array( 'style' => 'white-space: nowrap' ) ) .
 541                                         Xml::checkLabel( $name, "ns{$ns}", $name, in_array( $ns, $this->namespaces ) ) .
 542                                         Xml::closeElement( 'span' ) . "\n";
 543                 }
 544
 545                 $redirect = Xml::check( 'redirs', $this->searchRedirects, array( 'value' => '1' ) );
 546                 $searchField = Xml::input( 'search', 50, $term, array( 'type' => 'text', 'id' => 'powerSearchText' ) );
 547                 $searchButton = Xml::submitButton( wfMsg( 'powersearch' ), array( 'name' => 'fulltext' ) ) . "\n";
 548
 549                 $out = Xml::openElement( 'form', array( 'id' => 'powersearch', 'method' => 'get', 'action' => $wgScript ) ) .
 550                         Xml::openElement( 'fieldset' ) .
 551                         Xml::element( 'legend', array( ), wfMsg( 'powersearch-legend' ) ) .
 552                         Xml::hidden( 'title', 'Special:Search' ) .
 553                         wfMsgExt( 'powersearchtext', array( 'parse', 'replaceafter' ),
 554                                 $namespaces, $redirect, $searchField,
 555                                 '', '', '', '', '', # Dummy placeholders
 556                                 $searchButton ) .
 557                         Xml::closeElement( 'fieldset' ) .
 558                         Xml::closeElement( 'form' );
 559
 560                 return $out;
 561         }
 562
 563         function powerSearchFocus() {
 564                 return "<script type='text/javascript'>" .
 565                         "document.getElementById('powerSearchText').focus();" .
 566                         "</script>";
 567         }
 568
 569         function shortDialog($term) {
 570                 global $wgScript;
 571
 572                 $out  = Xml::openElement( 'form', array(
 573                         'id' => 'search',
 574                         'method' => 'get',
 575                         'action' => $wgScript
 576                 ));
 577                 $out .= Xml::hidden( 'title', 'Special:Search' );
 578                 $out .= Xml::input( 'search', 50, $term ) . ' ';
 579                 foreach( SearchEngine::searchableNamespaces() as $ns => $name ) {
 580                         if( in_array( $ns, $this->namespaces ) ) {
 581                                 $out .= Xml::hidden( "ns{$ns}", '1' );
 582                         }
 583                 }
 584                 $out .= Xml::submitButton( wfMsg( 'searchbutton' ), array( 'name' => 'fulltext' ) );
 585                 $out .= Xml::closeElement( 'form' );
 586
 587                 return $out;
 588         }
 589 }