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 # 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18 # http://www.gnu.org/copyleft/gpl.html
  19
  20 /**
  21  * Run text & title search and display the output
  22  * @package MediaWiki
  23  * @subpackage SpecialPage
  24  */
  25
  26 /** */
  27 require_once( 'SearchEngine.php' );
  28 require_once( 'Revision.php' );
  29
  30 /**
  31  * Entry point
  32  *
  33  * @param string $par (default '')
  34  */
  35 function wfSpecialSearch( $par = '' ) {
  36         global $wgRequest, $wgUser;
  37
  38         $search = $wgRequest->getText( 'search', $par );
  39         $searchPage = new SpecialSearch( $wgRequest, $wgUser );
  40         if( $wgRequest->getVal( 'fulltext' ) ||
  41                 !is_null( $wgRequest->getVal( 'offset' ) ) ||
  42                 !is_null ($wgRequest->getVal( 'searchx' ) ) ) {
  43                 $searchPage->showResults( $search );
  44         } else {
  45                 $searchPage->goResult( $search );
  46         }
  47 }
  48
  49 /**
  50  * @todo document
  51  * @package MediaWiki
  52  * @subpackage SpecialPage
  53  */
  54 class SpecialSearch {
  55
  56         /**
  57          * Set up basic search parameters from the request and user settings.
  58          * Typically you'll pass $wgRequest and $wgUser.
  59          *
  60          * @param WebRequest $request
  61          * @param User $user
  62          * @access public
  63          */
  64         function SpecialSearch( &$request, &$user ) {
  65                 list( $this->limit, $this->offset ) = $request->getLimitOffset( 20, 'searchlimit' );
  66
  67                 if( $request->getCheck( 'searchx' ) ) {
  68                         $this->namespaces = $this->powerSearch( $request );
  69                 } else {
  70                         $this->namespaces = $this->userNamespaces( $user );
  71                 }
  72
  73                 $this->searchRedirects = $request->getcheck( 'redirs' ) ? true : false;
  74         }
  75
  76         /**
  77          * If an exact title match can be found, jump straight ahead to
  78          * @param string $term
  79          * @access public
  80          */
  81         function goResult( $term ) {
  82                 global $wgOut;
  83                 global $wgGoToEdit;
  84
  85                 $this->setupPage( $term );
  86
  87                 # Try to go to page as entered.
  88                 #
  89                 $t = Title::newFromText( $term );
  90
  91                 # If the string cannot be used to create a title
  92                 if( is_null( $t ) ){
  93                         return $this->showResults( $term );
  94                 }
  95
  96                 # If there's an exact or very near match, jump right there.
  97                 $t = SearchEngine::getNearMatch( $term );
  98                 if( !is_null( $t ) ) {
  99                         $wgOut->redirect( $t->getFullURL() );
 100                         return;
 101                 }
 102
 103                 # No match, generate an edit URL
 104                 $t = Title::newFromText( $term );
 105                 if( is_null( $t ) ) {
 106                         $editurl = ''; # hrm...
 107                 } else {
 108                         wfRunHooks( 'SpecialSearchNogomatch', array( &$t ) );
 109                         # If the feature is enabled, go straight to the edit page
 110                         if ( $wgGoToEdit ) {
 111                                 $wgOut->redirect( $t->getFullURL( 'action=edit' ) );
 112                                 return;
 113                         } else {
 114                                 $editurl = $t->escapeLocalURL( 'action=edit' );
 115                         }
 116                 }
 117                 $wgOut->addWikiText( wfMsg('nogomatch', ":$term" ) );
 118
 119                 return $this->showResults( $term );
 120         }
 121
 122         /**
 123          * @param string $term
 124          * @access public
 125          */
 126         function showResults( $term ) {
 127                 $fname = 'SpecialSearch::showResults';
 128                 wfProfileIn( $fname );
 129
 130                 $this->setupPage( $term );
 131
 132                 global $wgUser, $wgOut;
 133                 $sk = $wgUser->getSkin();
 134                 $wgOut->addWikiText( wfMsg( 'searchresulttext' ) );
 135
 136                 #if ( !$this->parseQuery() ) {
 137                 if( '' === trim( $term ) ) {
 138                         $wgOut->setSubtitle( '' );
 139                         $wgOut->addHTML( $this->powerSearchBox( $term ) );
 140                         wfProfileOut( $fname );
 141                         return;
 142                 }
 143
 144                 global $wgDisableTextSearch;
 145                 if ( $wgDisableTextSearch ) {
 146                         global $wgForwardSearchUrl;
 147                         if( $wgForwardSearchUrl ) {
 148                                 $url = str_replace( '$1', urlencode( $term ), $wgForwardSearchUrl );
 149                                 $wgOut->redirect( $url );
 150                                 return;
 151                         }
 152                         global $wgInputEncoding;
 153                         $wgOut->addHTML( wfMsg( 'searchdisabled' ) );
 154                         $wgOut->addHTML(
 155                                 wfMsg( 'googlesearch',
 156                                         htmlspecialchars( $term ),
 157                                         htmlspecialchars( $wgInputEncoding ),
 158                                         htmlspecialchars( wfMsg( 'search' ) )
 159                                 )
 160                         );
 161                         wfProfileOut( $fname );
 162                         return;
 163                 }
 164
 165                 $search = SearchEngine::create();
 166                 $search->setLimitOffset( $this->limit, $this->offset );
 167                 $search->setNamespaces( $this->namespaces );
 168                 $search->showRedirects = $this->searchRedirects;
 169                 $titleMatches = $search->searchTitle( $term );
 170                 $textMatches = $search->searchText( $term );
 171
 172                 $num = ( $titleMatches ? $titleMatches->numRows() : 0 )
 173                         + ( $textMatches ? $textMatches->numRows() : 0);
 174                 if ( $num >= $this->limit ) {
 175                         $top = wfShowingResults( $this->offset, $this->limit );
 176                 } else {
 177                         $top = wfShowingResultsNum( $this->offset, $this->limit, $num );
 178                 }
 179                 $wgOut->addHTML( "<p>{$top}</p>\n" );
 180
 181                 if( $num || $this->offset ) {
 182                         $prevnext = wfViewPrevNext( $this->offset, $this->limit,
 183                                 'Special:Search',
 184                                 wfArrayToCGI(
 185                                         $this->powerSearchOptions(),
 186                                         array( 'search' => $term ) ) );
 187                         $wgOut->addHTML( "<br />{$prevnext}\n" );
 188                 }
 189
 190                 if( $titleMatches ) {
 191                         if( $titleMatches->numRows() ) {
 192                                 $wgOut->addWikiText( '==' . wfMsg( 'titlematches' ) . "==\n" );
 193                                 $wgOut->addHTML( $this->showMatches( $titleMatches ) );
 194                         } else {
 195                                 $wgOut->addWikiText( '==' . wfMsg( 'notitlematches' ) . "==\n" );
 196                         }
 197                 }
 198
 199                 if( $textMatches ) {
 200                         if( $textMatches->numRows() ) {
 201                                 $wgOut->addWikiText( '==' . wfMsg( 'textmatches' ) . "==\n" );
 202                                 $wgOut->addHTML( $this->showMatches( $textMatches ) );
 203                         } elseif( $num == 0 ) {
 204                                 # Don't show the 'no text matches' if we received title matches
 205                                 $wgOut->addWikiText( '==' . wfMsg( 'notextmatches' ) . "==\n" );
 206                         }
 207                 }
 208
 209                 if ( $num == 0 ) {
 210                         $wgOut->addWikiText( wfMsg( 'nonefound' ) );
 211                 }
 212                 if( $num || $this->offset ) {
 213                         $wgOut->addHTML( "<p>{$prevnext}</p>\n" );
 214                 }
 215                 $wgOut->addHTML( $this->powerSearchBox( $term ) );
 216                 wfProfileOut( $fname );
 217         }
 218
 219         #------------------------------------------------------------------
 220         # Private methods below this line
 221
 222         /**
 223          *
 224          */
 225         function setupPage( $term ) {
 226                 global $wgOut;
 227                 $wgOut->setPageTitle( wfMsg( 'searchresults' ) );
 228                 $wgOut->setSubtitle( htmlspecialchars( wfMsg( 'searchquery', $term ) ) );
 229                 $wgOut->setArticleRelated( false );
 230                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 231         }
 232
 233         /**
 234          * Extract default namespaces to search from the given user's
 235          * settings, returning a list of index numbers.
 236          *
 237          * @param User $user
 238          * @return array
 239          * @access private
 240          */
 241         function userNamespaces( &$user ) {
 242                 $arr = array();
 243                 foreach( SearchEngine::searchableNamespaces() as $ns => $name ) {
 244                         if( $user->getOption( 'searchNs' . $ns ) ) {
 245                                 $arr[] = $ns;
 246                         }
 247                 }
 248                 return $arr;
 249         }
 250
 251         /**
 252          * Extract "power search" namespace settings from the request object,
 253          * returning a list of index numbers to search.
 254          *
 255          * @param WebRequest $request
 256          * @return array
 257          * @access private
 258          */
 259         function powerSearch( &$request ) {
 260                 $arr = array();
 261                 foreach( SearchEngine::searchableNamespaces() as $ns => $name ) {
 262                         if( $request->getCheck( 'ns' . $ns ) ) {
 263                                 $arr[] = $ns;
 264                         }
 265                 }
 266                 return $arr;
 267         }
 268
 269         /**
 270          * Reconstruct the 'power search' options for links
 271          * @return array
 272          * @access private
 273          */
 274         function powerSearchOptions() {
 275                 $opt = array();
 276                 foreach( $this->namespaces as $n ) {
 277                         $opt['ns' . $n] = 1;
 278                 }
 279                 $opt['redirs'] = $this->searchRedirects ? 1 : 0;
 280                 $opt['searchx'] = 1;
 281                 return $opt;
 282         }
 283
 284         /**
 285          * @param SearchResultSet $matches
 286          * @param string $terms partial regexp for highlighting terms
 287          */
 288         function showMatches( &$matches ) {
 289                 $fname = 'SpecialSearch::showMatches';
 290                 wfProfileIn( $fname );
 291
 292                 global $wgContLang;
 293                 $tm = $wgContLang->convertForSearchResult( $matches->termMatches() );
 294                 $terms = implode( '|', $tm );
 295
 296                 global $wgOut;
 297                 $off = $this->offset + 1;
 298                 $out = "<ol start='{$off}'>\n";
 299
 300                 while( $result = $matches->next() ) {
 301                         $out .= $this->showHit( $result, $terms );
 302                 }
 303                 $out .= "</ol>\n";
 304
 305                 // convert the whole thing to desired language variant
 306                 global $wgContLang;
 307                 $out = $wgContLang->convert( $out );
 308                 wfProfileOut( $fname );
 309                 return $out;
 310         }
 311
 312         /**
 313          * Format a single hit result
 314          * @param SearchResult $result
 315          * @param string $terms partial regexp for highlighting terms
 316          */
 317         function showHit( $result, $terms ) {
 318                 $fname = 'SpecialSearch::showHit';
 319                 wfProfileIn( $fname );
 320                 global $wgUser, $wgContLang;
 321
 322                 $t = $result->getTitle();
 323                 if( is_null( $t ) ) {
 324                         wfProfileOut( $fname );
 325                         return "<!-- Broken link in search result -->\n";
 326                 }
 327                 $sk =& $wgUser->getSkin();
 328
 329                 $contextlines = $wgUser->getOption( 'contextlines' );
 330                 if ( '' == $contextlines ) { $contextlines = 5; }
 331                 $contextchars = $wgUser->getOption( 'contextchars' );
 332                 if ( '' == $contextchars ) { $contextchars = 50; }
 333
 334                 $link = $sk->makeKnownLinkObj( $t );
 335                 $revision = Revision::newFromTitle( $t );
 336                 $text = $revision->getText();
 337                 $size = wfMsg( 'nbytes', strlen( $text ) );
 338
 339                 $lines = explode( "\n", $text );
 340
 341                 $max = intval( $contextchars ) + 1;
 342                 $pat1 = "/(.*)($terms)(.{0,$max})/i";
 343
 344                 $lineno = 0;
 345
 346                 $extract = '';
 347                 wfProfileIn( "$fname-extract" );
 348                 foreach ( $lines as $line ) {
 349                         if ( 0 == $contextlines ) {
 350                                 break;
 351                         }
 352                         ++$lineno;
 353                         if ( ! preg_match( $pat1, $line, $m ) ) {
 354                                 continue;
 355                         }
 356                         --$contextlines;
 357                         $pre = $wgContLang->truncate( $m[1], -$contextchars, '...' );
 358
 359                         if ( count( $m ) < 3 ) {
 360                                 $post = '';
 361                         } else {
 362                                 $post = $wgContLang->truncate( $m[3], $contextchars, '...' );
 363                         }
 364
 365                         $found = $m[2];
 366
 367                         $line = htmlspecialchars( $pre . $found . $post );
 368                         $pat2 = '/(' . $terms . ")/i";
 369                         $line = preg_replace( $pat2,
 370                           "<span class='searchmatch'>\\1</span>", $line );
 371
 372                         $extract .= "<br /><small>{$lineno}: {$line}</small>\n";
 373                 }
 374                 wfProfileOut( "$fname-extract" );
 375                 wfProfileOut( $fname );
 376                 return "<li>{$link} ({$size}){$extract}</li>\n";
 377         }
 378
 379         function powerSearchBox( $term ) {
 380                 $namespaces = '';
 381                 foreach( SearchEngine::searchableNamespaces() as $ns => $name ) {
 382                         $checked = in_array( $ns, $this->namespaces )
 383                                 ? ' checked="checked"'
 384                                 : '';
 385                         $name = str_replace( '_', ' ', $name );
 386                         if( '' == $name ) {
 387                                 $name = wfMsg( 'blanknamespace' );
 388                         }
 389                         $namespaces .= " <label><input type='checkbox' value=\"1\" name=\"" .
 390                           "ns{$ns}\"{$checked} />{$name}</label>\n";
 391                 }
 392
 393                 $checked = $this->searchRedirects
 394                         ? ' checked="checked"'
 395                         : '';
 396                 $redirect = "<input type='checkbox' value='1' name=\"redirs\"{$checked} />\n";
 397
 398                 $searchField = '<input type="text" name="search" value="' .
 399                         htmlspecialchars( $term ) ."\" size=\"16\" />\n";
 400
 401                 $searchButton = '<input type="submit" name="searchx" value="' .
 402                   htmlspecialchars( wfMsg('powersearch') ) . "\" />\n";
 403
 404                 $ret = wfMsg( 'powersearchtext',
 405                         $namespaces, $redirect, $searchField,
 406                         '', '', '', '', '', # Dummy placeholders
 407                         $searchButton );
 408
 409                 $title = Title::makeTitle( NS_SPECIAL, 'Search' );
 410                 $action = $title->escapeLocalURL();
 411                 return "<br /><br />\n<form id=\"powersearch\" method=\"get\" " .
 412                   "action=\"$action\">\n{$ret}\n</form>\n";
 413         }
 414 }
 415
 416 ?>