includes/search/SearchResult.php

   1 <?php
   2 /**
   3  * Search engine result
   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  * @file
  21  * @ingroup Search
  22  */
  23
  24 /**
  25  * @todo FIXME: This class is horribly factored. It would probably be better to
  26  * have a useful base class to which you pass some standard information, then
  27  * let the fancy self-highlighters extend that.
  28  * @ingroup Search
  29  */
  30 class SearchResult {
  31
  32         /**
  33          * @var Revision
  34          */
  35         protected $mRevision = null;
  36
  37         /**
  38          * @var File
  39          */
  40         protected $mImage = null;
  41
  42         /**
  43          * @var Title
  44          */
  45         protected $mTitle;
  46
  47         /**
  48          * @var string
  49          */
  50         protected $mText;
  51
  52         /**
  53          * Return a new SearchResult and initializes it with a title.
  54          *
  55          * @param Title $title
  56          * @return SearchResult
  57          */
  58         public static function newFromTitle( $title ) {
  59                 $result = new self();
  60                 $result->initFromTitle( $title );
  61                 return $result;
  62         }
  63
  64         /**
  65          * Initialize from a Title and if possible initializes a corresponding
  66          * Revision and File.
  67          *
  68          * @param Title $title
  69          */
  70         protected function initFromTitle( $title ) {
  71                 $this->mTitle = $title;
  72                 if ( !is_null( $this->mTitle ) ) {
  73                         $id = false;
  74                         wfRunHooks( 'SearchResultInitFromTitle', array( $title, &$id ) );
  75                         $this->mRevision = Revision::newFromTitle(
  76                                 $this->mTitle, $id, Revision::READ_NORMAL );
  77                         if ( $this->mTitle->getNamespace() === NS_FILE ) {
  78                                 $this->mImage = wfFindFile( $this->mTitle );
  79                         }
  80                 }
  81         }
  82
  83         /**
  84          * Check if this is result points to an invalid title
  85          *
  86          * @return bool
  87          */
  88         function isBrokenTitle() {
  89                 return is_null( $this->mTitle );
  90         }
  91
  92         /**
  93          * Check if target page is missing, happens when index is out of date
  94          *
  95          * @return bool
  96          */
  97         function isMissingRevision() {
  98                 return !$this->mRevision && !$this->mImage;
  99         }
 100
 101         /**
 102          * @return Title
 103          */
 104         function getTitle() {
 105                 return $this->mTitle;
 106         }
 107
 108         /**
 109          * Get the file for this page, if one exists
 110          * @return File|null
 111          */
 112         function getFile() {
 113                 return $this->mImage;
 114         }
 115
 116         /**
 117          * Lazy initialization of article text from DB
 118          */
 119         protected function initText() {
 120                 if ( !isset( $this->mText ) ) {
 121                         if ( $this->mRevision != null ) {
 122                                 $this->mText = SearchEngine::create()
 123                                         ->getTextFromContent( $this->mTitle, $this->mRevision->getContent() );
 124                         } else { // TODO: can we fetch raw wikitext for commons images?
 125                                 $this->mText = '';
 126                         }
 127                 }
 128         }
 129
 130         /**
 131          * @param array $terms Terms to highlight
 132          * @return string Highlighted text snippet, null (and not '') if not supported
 133          */
 134         function getTextSnippet( $terms ) {
 135                 global $wgAdvancedSearchHighlighting;
 136                 $this->initText();
 137
 138                 // TODO: make highliter take a content object. Make ContentHandler a factory for SearchHighliter.
 139                 list( $contextlines, $contextchars ) = SearchEngine::userHighlightPrefs();
 140
 141                 $h = new SearchHighlighter();
 142                 if ( count( $terms ) > 0 ) {
 143                         if ( $wgAdvancedSearchHighlighting ) {
 144                                 return $h->highlightText( $this->mText, $terms, $contextlines, $contextchars );
 145                         } else {
 146                                 return $h->highlightSimple( $this->mText, $terms, $contextlines, $contextchars );
 147                         }
 148                 } else {
 149                         return $h->highlightNone( $this->mText, $contextlines, $contextchars );
 150                 }
 151         }
 152
 153         /**
 154          * @return string Highlighted title, '' if not supported
 155          */
 156         function getTitleSnippet() {
 157                 return '';
 158         }
 159
 160         /**
 161          * @return string Highlighted redirect name (redirect to this page), '' if none or not supported
 162          */
 163         function getRedirectSnippet() {
 164                 return '';
 165         }
 166
 167         /**
 168          * @return Title Title object for the redirect to this page, null if none or not supported
 169          */
 170         function getRedirectTitle() {
 171                 return null;
 172         }
 173
 174         /**
 175          * @return string Highlighted relevant section name, null if none or not supported
 176          */
 177         function getSectionSnippet() {
 178                 return '';
 179         }
 180
 181         /**
 182          * @return Title Title object (pagename+fragment) for the section, null if none or not supported
 183          */
 184         function getSectionTitle() {
 185                 return null;
 186         }
 187
 188         /**
 189          * @return string Timestamp
 190          */
 191         function getTimestamp() {
 192                 if ( $this->mRevision ) {
 193                         return $this->mRevision->getTimestamp();
 194                 } elseif ( $this->mImage ) {
 195                         return $this->mImage->getTimestamp();
 196                 }
 197                 return '';
 198         }
 199
 200         /**
 201          * @return int Number of words
 202          */
 203         function getWordCount() {
 204                 $this->initText();
 205                 return str_word_count( $this->mText );
 206         }
 207
 208         /**
 209          * @return int Size in bytes
 210          */
 211         function getByteSize() {
 212                 $this->initText();
 213                 return strlen( $this->mText );
 214         }
 215
 216         /**
 217          * @return string Interwiki prefix of the title (return iw even if title is broken)
 218          */
 219         function getInterwikiPrefix() {
 220                 return '';
 221         }
 222
 223         /**
 224          * @return string Interwiki namespace of the title (since we likely can't resolve it locally)
 225          */
 226         function getInterwikiNamespaceText() {
 227                 return '';
 228         }
 229
 230         /**
 231          * Did this match file contents (eg: PDF/DJVU)?
 232          * @return bool
 233          */
 234         function isFileMatch() {
 235                 return false;
 236         }
 237 }