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