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                         # If the feature is enabled, go straight to the edit page
 109                         if ( $wgGoToEdit ) {
 110                                 $wgOut->redirect( $t->getFullURL( 'action=edit' ) );
 111                                 return;
 112                         } else {
 113                                 $editurl = $t->escapeLocalURL( 'action=edit' );
 114                         }
 115                 }
 116                 $wgOut->addWikiText( wfMsg('nogomatch', ":$term" ) );
 117
 118                 return $this->showResults( $term );
 119         }
 120
 121         /**
 122          * @param string $term
 123          * @access public
 124          */
 125         function showResults( $term ) {
 126                 $fname = 'SpecialSearch::showResults';
 127                 wfProfileIn( $fname );
 128
 129                 $this->setupPage( $term );
 130
 131                 global $wgUser, $wgOut;
 132                 $sk = $wgUser->getSkin();
 133                 $wgOut->addWikiText( wfMsg( 'searchresulttext' ) );
 134
 135                 #if ( !$this->parseQuery() ) {
 136                 if( '' === trim( $term ) ) {
 137                         $wgOut->setSubtitle( '' );
 138                         $wgOut->addHTML( $this->powerSearchBox( $term ) );
 139                         wfProfileOut( $fname );
 140                         return;
 141                 }
 142
 143                 global $wgDisableTextSearch;
 144                 if ( $wgDisableTextSearch ) {
 145                         global $wgForwardSearchUrl;
 146                         if( $wgForwardSearchUrl ) {
 147                                 $url = str_replace( '$1', urlencode( $term ), $wgForwardSearchUrl );
 148                                 $wgOut->redirect( $url );
 149                                 return;
 150                         }
 151                         global $wgInputEncoding;
 152                         $wgOut->addHTML( wfMsg( 'searchdisabled' ) );
 153                         $wgOut->addHTML(
 154                                 wfMsg( 'googlesearch',
 155                                         htmlspecialchars( $term ),
 156                                         htmlspecialchars( $wgInputEncoding ),
 157                                         htmlspecialchars( wfMsg( 'search' ) )
 158                                 )
 159                         );
 160                         wfProfileOut( $fname );
 161                         return;
 162                 }
 163
 164                 $search = SearchEngine::create();
 165                 $search->setLimitOffset( $this->limit, $this->offset );
 166                 $search->setNamespaces( $this->namespaces );
 167                 $search->showRedirects = $this->searchRedirects;
 168                 $titleMatches = $search->searchTitle( $term );
 169                 $textMatches = $search->searchText( $term );
 170
 171                 $num = ( $titleMatches ? $titleMatches->numRows() : 0 )
 172                         + ( $textMatches ? $textMatches->numRows() : 0);
 173                 if ( $num >= $this->limit ) {
 174                         $top = wfShowingResults( $this->offset, $this->limit );
 175                 } else {
 176                         $top = wfShowingResultsNum( $this->offset, $this->limit, $num );
 177                 }
 178                 $wgOut->addHTML( "<p>{$top}</p>\n" );
 179
 180                 if( $num || $this->offset ) {
 181                         $prevnext = wfViewPrevNext( $this->offset, $this->limit,
 182                                 'Special:Search',
 183                                 wfArrayToCGI(
 184                                         $this->powerSearchOptions(),
 185                                         array( 'search' => $term ) ) );
 186                         $wgOut->addHTML( "<br />{$prevnext}\n" );
 187                 }
 188
 189                 if( $titleMatches ) {
 190                         if( $titleMatches->numRows() ) {
 191                                 $wgOut->addWikiText( '==' . wfMsg( 'titlematches' ) . "==\n" );
 192                                 $wgOut->addHTML( $this->showMatches( $titleMatches ) );
 193                         } else {
 194                                 $wgOut->addWikiText( '==' . wfMsg( 'notitlematches' ) . "==\n" );
 195                         }
 196                 }
 197
 198                 if( $textMatches ) {
 199                         if( $textMatches->numRows() ) {
 200                                 $wgOut->addWikiText( '==' . wfMsg( 'textmatches' ) . "==\n" );
 201                                 $wgOut->addHTML( $this->showMatches( $textMatches ) );
 202                         } elseif( $num == 0 ) {
 203                                 # Don't show the 'no text matches' if we received title matches
 204                                 $wgOut->addWikiText( '==' . wfMsg( 'notextmatches' ) . "==\n" );
 205                         }
 206                 }
 207
 208                 if ( $num == 0 ) {
 209                         $wgOut->addWikiText( wfMsg( 'nonefound' ) );
 210                 }
 211                 if( $num || $this->offset ) {
 212                         $wgOut->addHTML( "<p>{$prevnext}</p>\n" );
 213                 }
 214                 $wgOut->addHTML( $this->powerSearchBox( $term ) );
 215                 wfProfileOut( $fname );
 216         }
 217
 218         #------------------------------------------------------------------
 219         # Private methods below this line
 220
 221         /**
 222          *
 223          */
 224         function setupPage( $term ) {
 225                 global $wgOut;
 226                 $wgOut->setPageTitle( wfMsg( 'searchresults' ) );
 227                 $wgOut->setSubtitle( htmlspecialchars( wfMsg( 'searchquery', $term ) ) );
 228                 $wgOut->setArticleRelated( false );
 229                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 230         }
 231
 232         /**
 233          * Extract default namespaces to search from the given user's
 234          * settings, returning a list of index numbers.
 235          *
 236          * @param User $user
 237          * @return array
 238          * @access private
 239          */
 240         function userNamespaces( &$user ) {
 241                 $arr = array();
 242                 foreach( SearchEngine::searchableNamespaces() as $ns => $name ) {
 243                         if( $user->getOption( 'searchNs' . $ns ) ) {
 244                                 $arr[] = $ns;
 245                         }
 246                 }
 247                 return $arr;
 248         }
 249
 250         /**
 251          * Extract "power search" namespace settings from the request object,
 252          * returning a list of index numbers to search.
 253          *
 254          * @param WebRequest $request
 255          * @return array
 256          * @access private
 257          */
 258         function powerSearch( &$request ) {
 259                 $arr = array();
 260                 foreach( SearchEngine::searchableNamespaces() as $ns => $name ) {
 261                         if( $request->getCheck( 'ns' . $ns ) ) {
 262                                 $arr[] = $ns;
 263                         }
 264                 }
 265                 return $arr;
 266         }
 267
 268         /**
 269          * Reconstruct the 'power search' options for links
 270          * @return array
 271          * @access private
 272          */
 273         function powerSearchOptions() {
 274                 $opt = array();
 275                 foreach( $this->namespaces as $n ) {
 276                         $opt['ns' . $n] = 1;
 277                 }
 278                 $opt['redirs'] = $this->searchRedirects ? 1 : 0;
 279                 $opt['searchx'] = 1;
 280                 return $opt;
 281         }
 282
 283         /**
 284          * @param SearchResultSet $matches
 285          * @param string $terms partial regexp for highlighting terms
 286          */
 287         function showMatches( &$matches ) {
 288                 $fname = 'SpecialSearch::showMatches';
 289                 wfProfileIn( $fname );
 290
 291                 global $wgContLang;
 292                 $tm = $wgContLang->convertForSearchResult( $matches->termMatches() );
 293                 $terms = implode( '|', $tm );
 294
 295                 global $wgOut;
 296                 $off = $this->offset + 1;
 297                 $out = "<ol start='{$off}'>\n";
 298
 299                 while( $result = $matches->next() ) {
 300                         $out .= $this->showHit( $result, $terms );
 301                 }
 302                 $out .= "</ol>\n";
 303
 304                 // convert the whole thing to desired language variant
 305                 global $wgContLang;
 306                 $out = $wgContLang->convert( $out );
 307                 wfProfileOut( $fname );
 308                 return $out;
 309         }
 310
 311         /**
 312          * Format a single hit result
 313          * @param SearchResult $result
 314          * @param string $terms partial regexp for highlighting terms
 315          */
 316         function showHit( $result, $terms ) {
 317                 $fname = 'SpecialSearch::showHit';
 318                 wfProfileIn( $fname );
 319                 global $wgUser, $wgContLang;
 320
 321                 $t = $result->getTitle();
 322                 if( is_null( $t ) ) {
 323                         wfProfileOut( $fname );
 324                         return "<!-- Broken link in search result -->\n";
 325                 }
 326                 $sk =& $wgUser->getSkin();
 327
 328                 $contextlines = $wgUser->getOption( 'contextlines' );
 329                 if ( '' == $contextlines ) { $contextlines = 5; }
 330                 $contextchars = $wgUser->getOption( 'contextchars' );
 331                 if ( '' == $contextchars ) { $contextchars = 50; }
 332
 333                 $link = $sk->makeKnownLinkObj( $t );
 334                 $revision = Revision::newFromTitle( $t );
 335                 $text = $revision->getText();
 336                 $size = wfMsg( 'nbytes', strlen( $text ) );
 337
 338                 $lines = explode( "\n", $text );
 339
 340                 $max = intval( $contextchars ) + 1;
 341                 $pat1 = "/(.*)($terms)(.{0,$max})/i";
 342
 343                 $lineno = 0;
 344
 345                 $extract = '';
 346                 wfProfileIn( "$fname-extract" );
 347                 foreach ( $lines as $line ) {
 348                         if ( 0 == $contextlines ) {
 349                                 break;
 350                         }
 351                         ++$lineno;
 352                         if ( ! preg_match( $pat1, $line, $m ) ) {
 353                                 continue;
 354                         }
 355                         --$contextlines;
 356                         $pre = $wgContLang->truncate( $m[1], -$contextchars, '...' );
 357
 358                         if ( count( $m ) < 3 ) {
 359                                 $post = '';
 360                         } else {
 361                                 $post = $wgContLang->truncate( $m[3], $contextchars, '...' );
 362                         }
 363
 364                         $found = $m[2];
 365
 366                         $line = htmlspecialchars( $pre . $found . $post );
 367                         $pat2 = '/(' . $terms . ")/i";
 368                         $line = preg_replace( $pat2,
 369                           "<span class='searchmatch'>\\1</span>", $line );
 370
 371                         $extract .= "<br /><small>{$lineno}: {$line}</small>\n";
 372                 }
 373                 wfProfileOut( "$fname-extract" );
 374                 wfProfileOut( $fname );
 375                 return "<li>{$link} ({$size}){$extract}</li>\n";
 376         }
 377
 378         function powerSearchBox( $term ) {
 379                 $namespaces = '';
 380                 foreach( SearchEngine::searchableNamespaces() as $ns => $name ) {
 381                         $checked = in_array( $ns, $this->namespaces )
 382                                 ? ' checked="checked"'
 383                                 : '';
 384                         $name = str_replace( '_', ' ', $name );
 385                         if( '' == $name ) {
 386                                 $name = wfMsg( 'blanknamespace' );
 387                         }
 388                         $namespaces .= " <label><input type='checkbox' value=\"1\" name=\"" .
 389                           "ns{$ns}\"{$checked} />{$name}</label>\n";
 390                 }
 391
 392                 $checked = $this->searchRedirects
 393                         ? ' checked="checked"'
 394                         : '';
 395                 $redirect = "<input type='checkbox' value='1' name=\"redirs\"{$checked} />\n";
 396
 397                 $searchField = "<input type='text' name=\"search\" value=\"" .
 398                         htmlspecialchars( $term ) ."\" width=\"80\" />\n";
 399
 400                 $searchButton = '<input type="submit" name="searchx" value="' .
 401                   htmlspecialchars( wfMsg('powersearch') ) . "\" />\n";
 402
 403                 $ret = wfMsg( 'powersearchtext',
 404                         $namespaces, $redirect, $searchField,
 405                         '', '', '', '', '', # Dummy placeholders
 406                         $searchButton );
 407
 408                 $title = Title::makeTitle( NS_SPECIAL, 'Search' );
 409                 $action = $title->escapeLocalURL();
 410                 return "<br /><br />\n<form id=\"powersearch\" method=\"get\" " .
 411                   "action=\"$action\">\n{$ret}\n</form>\n";
 412         }
 413 }
 414
 415 ?>