includes/CategoryPage.php

   1 <?php
   2 /**
   3  * Special handling for category description pages
   4  * Modelled after ImagePage.php
   5  *
   6  */
   7
   8 if( !defined( 'MEDIAWIKI' ) )
   9         die( 1 );
  10
  11 /**
  12  */
  13 class CategoryPage extends Article {
  14         function view() {
  15                 global $wgRequest, $wgUser;
  16
  17                 $diff = $wgRequest->getVal( 'diff' );
  18                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
  19
  20                 if ( isset( $diff ) && $diffOnly )
  21                         return Article::view();
  22
  23                 if(!wfRunHooks('CategoryPageView', array(&$this))) return;
  24
  25                 if ( NS_CATEGORY == $this->mTitle->getNamespace() ) {
  26                         $this->openShowCategory();
  27                 }
  28
  29                 Article::view();
  30
  31                 # If the article we've just shown is in the "Image" namespace,
  32                 # follow it with the history list and link list for the image
  33                 # it describes.
  34
  35                 if ( NS_CATEGORY == $this->mTitle->getNamespace() ) {
  36                         $this->closeShowCategory();
  37                 }
  38         }
  39
  40         /**
  41          * Don't return a 404 for categories in use.
  42          */
  43         function hasViewableContent() {
  44                 if( parent::hasViewableContent() ) {
  45                         return true;
  46                 } else {
  47                         $cat = Category::newFromTitle( $this->mTitle );
  48                         return $cat->getId() != 0;
  49                 }
  50
  51         }
  52
  53         function openShowCategory() {
  54                 # For overloading
  55         }
  56
  57         function closeShowCategory() {
  58                 global $wgOut, $wgRequest;
  59                 $from = $wgRequest->getVal( 'from' );
  60                 $until = $wgRequest->getVal( 'until' );
  61
  62                 $viewer = new CategoryViewer( $this->mTitle, $from, $until );
  63                 $wgOut->addHTML( $viewer->getHTML() );
  64         }
  65 }
  66
  67 class CategoryViewer {
  68         var $title, $limit, $from, $until,
  69                 $articles, $articles_start_char,
  70                 $children, $children_start_char,
  71                 $showGallery, $gallery,
  72                 $skin;
  73         /** Category object for this page */
  74         private $cat;
  75
  76         function __construct( $title, $from = '', $until = '' ) {
  77                 global $wgCategoryPagingLimit;
  78                 $this->title = $title;
  79                 $this->from = $from;
  80                 $this->until = $until;
  81                 $this->limit = $wgCategoryPagingLimit;
  82                 $this->cat = Category::newFromName( $title->getDBKey() );
  83         }
  84
  85         /**
  86          * Format the category data list.
  87          *
  88          * @return string HTML output
  89          * @private
  90          */
  91         function getHTML() {
  92                 global $wgOut, $wgCategoryMagicGallery, $wgCategoryPagingLimit;
  93                 wfProfileIn( __METHOD__ );
  94
  95                 $this->showGallery = $wgCategoryMagicGallery && !$wgOut->mNoGallery;
  96
  97                 $this->clearCategoryState();
  98                 $this->doCategoryQuery();
  99                 $this->finaliseCategoryState();
 100
 101                 $r = $this->getCategoryTop() .
 102                         $this->getSubcategorySection() .
 103                         $this->getPagesSection() .
 104                         $this->getImageSection() .
 105                         $this->getCategoryBottom();
 106
 107                 // Give a proper message if category is empty
 108                 if ( $r == '' ) {
 109                         $r = wfMsgExt( 'category-empty', array( 'parse' ) );
 110                 }
 111
 112                 wfProfileOut( __METHOD__ );
 113                 return $r;
 114         }
 115
 116         function clearCategoryState() {
 117                 $this->articles = array();
 118                 $this->articles_start_char = array();
 119                 $this->children = array();
 120                 $this->children_start_char = array();
 121                 if( $this->showGallery ) {
 122                         $this->gallery = new ImageGallery();
 123                         $this->gallery->setHideBadImages();
 124                 }
 125         }
 126
 127         function getSkin() {
 128                 if ( !$this->skin ) {
 129                         global $wgUser;
 130                         $this->skin = $wgUser->getSkin();
 131                 }
 132                 return $this->skin;
 133         }
 134
 135         /**
 136          * Add a subcategory to the internal lists, using a Category object
 137          */
 138         function addSubcategoryObject( $cat, $sortkey, $pageLength ) {
 139                 $title = $cat->getTitle();
 140                 $this->addSubcategory( $title, $sortkey, $pageLength );
 141         }
 142
 143         /**
 144          * Add a subcategory to the internal lists, using a title object
 145          * @deprecated kept for compatibility, please use addSubcategoryObject instead
 146          */
 147         function addSubcategory( $title, $sortkey, $pageLength ) {
 148                 global $wgContLang;
 149                 // Subcategory; strip the 'Category' namespace from the link text.
 150                 $this->children[] = $this->getSkin()->makeKnownLinkObj(
 151                         $title, $wgContLang->convertHtml( $title->getText() ) );
 152
 153                 $this->children_start_char[] = $this->getSubcategorySortChar( $title, $sortkey );
 154         }
 155
 156         /**
 157         * Get the character to be used for sorting subcategories.
 158         * If there's a link from Category:A to Category:B, the sortkey of the resulting
 159         * entry in the categorylinks table is Category:A, not A, which it SHOULD be.
 160         * Workaround: If sortkey == "Category:".$title, than use $title for sorting,
 161         * else use sortkey...
 162         */
 163         function getSubcategorySortChar( $title, $sortkey ) {
 164                 global $wgContLang;
 165
 166                 if( $title->getPrefixedText() == $sortkey ) {
 167                         $firstChar = $wgContLang->firstChar( $title->getDBkey() );
 168                 } else {
 169                         $firstChar = $wgContLang->firstChar( $sortkey );
 170                 }
 171
 172                 return $wgContLang->convert( $firstChar );
 173         }
 174
 175         /**
 176          * Add a page in the image namespace
 177          */
 178         function addImage( Title $title, $sortkey, $pageLength, $isRedirect = false ) {
 179                 if ( $this->showGallery ) {
 180                         if( $this->flip ) {
 181                                 $this->gallery->insert( $title );
 182                         } else {
 183                                 $this->gallery->add( $title );
 184                         }
 185                 } else {
 186                         $this->addPage( $title, $sortkey, $pageLength, $isRedirect );
 187                 }
 188         }
 189
 190         /**
 191          * Add a miscellaneous page
 192          */
 193         function addPage( $title, $sortkey, $pageLength, $isRedirect = false ) {
 194                 global $wgContLang;
 195                 $this->articles[] = $isRedirect
 196                         ? '<span class="redirect-in-category">' . $this->getSkin()->makeKnownLinkObj( $title ) . '</span>'
 197                         : $this->getSkin()->makeSizeLinkObj( $pageLength, $title );
 198                 $this->articles_start_char[] = $wgContLang->convert( $wgContLang->firstChar( $sortkey ) );
 199         }
 200
 201         function finaliseCategoryState() {
 202                 if( $this->flip ) {
 203                         $this->children            = array_reverse( $this->children );
 204                         $this->children_start_char = array_reverse( $this->children_start_char );
 205                         $this->articles            = array_reverse( $this->articles );
 206                         $this->articles_start_char = array_reverse( $this->articles_start_char );
 207                 }
 208         }
 209
 210         function doCategoryQuery() {
 211                 $dbr = wfGetDB( DB_SLAVE );
 212                 if( $this->from != '' ) {
 213                         $pageCondition = 'cl_sortkey >= ' . $dbr->addQuotes( $this->from );
 214                         $this->flip = false;
 215                 } elseif( $this->until != '' ) {
 216                         $pageCondition = 'cl_sortkey < ' . $dbr->addQuotes( $this->until );
 217                         $this->flip = true;
 218                 } else {
 219                         $pageCondition = '1 = 1';
 220                         $this->flip = false;
 221                 }
 222                 $res = $dbr->select(
 223                         array( 'page', 'categorylinks', 'category' ),
 224                         array( 'page_title', 'page_namespace', 'page_len', 'page_is_redirect', 'cl_sortkey',
 225                                 'cat_id', 'cat_title', 'cat_subcats', 'cat_pages', 'cat_files' ),
 226                         array( $pageCondition, 'cl_to' => $this->title->getDBkey() ),
 227                         __METHOD__,
 228                         array( 'ORDER BY' => $this->flip ? 'cl_sortkey DESC' : 'cl_sortkey',
 229                                 'USE INDEX' => array( 'categorylinks' => 'cl_sortkey' ),
 230                                 'LIMIT'    => $this->limit + 1 ),
 231                         array( 'categorylinks'  => array( 'INNER JOIN', 'cl_from = page_id' ),
 232                                 'category' => array( 'LEFT JOIN', 'cat_title = page_title AND page_namespace = ' . NS_CATEGORY ) )
 233                 );
 234
 235                 $count = 0;
 236                 $this->nextPage = null;
 237                 while( $x = $dbr->fetchObject ( $res ) ) {
 238                         if( ++$count > $this->limit ) {
 239                                 // We've reached the one extra which shows that there are
 240                                 // additional pages to be had. Stop here...
 241                                 $this->nextPage = $x->cl_sortkey;
 242                                 break;
 243                         }
 244
 245                         $title = Title::makeTitle( $x->page_namespace, $x->page_title );
 246
 247                         if( $title->getNamespace() == NS_CATEGORY ) {
 248                                 $cat = Category::newFromRow( $x, $title );
 249                                 $this->addSubcategoryObject( $cat, $x->cl_sortkey, $x->page_len );
 250                         } elseif( $this->showGallery && $title->getNamespace() == NS_FILE ) {
 251                                 $this->addImage( $title, $x->cl_sortkey, $x->page_len, $x->page_is_redirect );
 252                         } else {
 253                                 $this->addPage( $title, $x->cl_sortkey, $x->page_len, $x->page_is_redirect );
 254                         }
 255                 }
 256                 $dbr->freeResult( $res );
 257         }
 258
 259         function getCategoryTop() {
 260                 $r = '';
 261                 if( $this->until != '' ) {
 262                         $r .= $this->pagingLinks( $this->title, $this->nextPage, $this->until, $this->limit );
 263                 } elseif( $this->nextPage != '' || $this->from != '' ) {
 264                         $r .= $this->pagingLinks( $this->title, $this->from, $this->nextPage, $this->limit );
 265                 }
 266                 return $r == ''
 267                         ? $r
 268                         : "<br style=\"clear:both;\"/>\n" . $r;
 269         }
 270
 271         function getSubcategorySection() {
 272                 # Don't show subcategories section if there are none.
 273                 $r = '';
 274                 $rescnt = count( $this->children );
 275                 $dbcnt = $this->cat->getSubcatCount();
 276                 $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'subcat' );
 277                 if( $rescnt > 0 ) {
 278                         # Showing subcategories
 279                         $r .= "<div id=\"mw-subcategories\">\n";
 280                         $r .= '<h2>' . wfMsg( 'subcategories' ) . "</h2>\n";
 281                         $r .= $countmsg;
 282                         $r .= $this->formatList( $this->children, $this->children_start_char );
 283                         $r .= "\n</div>";
 284                 }
 285                 return $r;
 286         }
 287
 288         function getPagesSection() {
 289                 $ti = htmlspecialchars( $this->title->getText() );
 290                 # Don't show articles section if there are none.
 291                 $r = '';
 292
 293                 # FIXME, here and in the other two sections: we don't need to bother
 294                 # with this rigamarole if the entire category contents fit on one page
 295                 # and have already been retrieved.  We can just use $rescnt in that
 296                 # case and save a query and some logic.
 297                 $dbcnt = $this->cat->getPageCount() - $this->cat->getSubcatCount()
 298                         - $this->cat->getFileCount();
 299                 $rescnt = count( $this->articles );
 300                 $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'article' );
 301
 302                 if( $rescnt > 0 ) {
 303                         $r = "<div id=\"mw-pages\">\n";
 304                         $r .= '<h2>' . wfMsg( 'category_header', $ti ) . "</h2>\n";
 305                         $r .= $countmsg;
 306                         $r .= $this->formatList( $this->articles, $this->articles_start_char );
 307                         $r .= "\n</div>";
 308                 }
 309                 return $r;
 310         }
 311
 312         function getImageSection() {
 313                 if( $this->showGallery && ! $this->gallery->isEmpty() ) {
 314                         $dbcnt = $this->cat->getFileCount();
 315                         $rescnt = $this->gallery->count();
 316                         $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'file' );
 317
 318                         return "<div id=\"mw-category-media\">\n" .
 319                         '<h2>' . wfMsg( 'category-media-header', htmlspecialchars($this->title->getText()) ) . "</h2>\n" .
 320                         $countmsg . $this->gallery->toHTML() . "\n</div>";
 321                 } else {
 322                         return '';
 323                 }
 324         }
 325
 326         function getCategoryBottom() {
 327                 if( $this->until != '' ) {
 328                         return $this->pagingLinks( $this->title, $this->nextPage, $this->until, $this->limit );
 329                 } elseif( $this->nextPage != '' || $this->from != '' ) {
 330                         return $this->pagingLinks( $this->title, $this->from, $this->nextPage, $this->limit );
 331                 } else {
 332                         return '';
 333                 }
 334         }
 335
 336         /**
 337          * Format a list of articles chunked by letter, either as a
 338          * bullet list or a columnar format, depending on the length.
 339          *
 340          * @param $articles Array
 341          * @param $articles_start_char Array
 342          * @param $cutoff Int
 343          * @return String
 344          * @private
 345          */
 346         function formatList( $articles, $articles_start_char, $cutoff = 6 ) {
 347                 if ( count ( $articles ) > $cutoff ) {
 348                         return $this->columnList( $articles, $articles_start_char );
 349                 } elseif ( count($articles) > 0) {
 350                         // for short lists of articles in categories.
 351                         return $this->shortList( $articles, $articles_start_char );
 352                 }
 353                 return '';
 354         }
 355
 356         /**
 357          * Format a list of articles chunked by letter in a three-column
 358          * list, ordered vertically.
 359          *
 360          * @param $articles Array
 361          * @param $articles_start_char Array
 362          * @return String
 363          * @private
 364          */
 365         function columnList( $articles, $articles_start_char ) {
 366                 // divide list into three equal chunks
 367                 $chunk = (int) (count ( $articles ) / 3);
 368
 369                 // get and display header
 370                 $r = '<table width="100%"><tr valign="top">';
 371
 372                 $prev_start_char = 'none';
 373
 374                 // loop through the chunks
 375                 for($startChunk = 0, $endChunk = $chunk, $chunkIndex = 0;
 376                         $chunkIndex < 3;
 377                         $chunkIndex++, $startChunk = $endChunk, $endChunk += $chunk + 1)
 378                 {
 379                         $r .= "<td>\n";
 380                         $atColumnTop = true;
 381
 382                         // output all articles in category
 383                         for ($index = $startChunk ;
 384                                 $index < $endChunk && $index < count($articles);
 385                                 $index++ )
 386                         {
 387                                 // check for change of starting letter or begining of chunk
 388                                 if ( ($index == $startChunk) ||
 389                                          ($articles_start_char[$index] != $articles_start_char[$index - 1]) )
 390
 391                                 {
 392                                         if( $atColumnTop ) {
 393                                                 $atColumnTop = false;
 394                                         } else {
 395                                                 $r .= "</ul>\n";
 396                                         }
 397                                         $cont_msg = "";
 398                                         if ( $articles_start_char[$index] == $prev_start_char )
 399                                                 $cont_msg = ' ' . wfMsgHtml( 'listingcontinuesabbrev' );
 400                                         $r .= "<h3>" . htmlspecialchars( $articles_start_char[$index] ) . "$cont_msg</h3>\n<ul>";
 401                                         $prev_start_char = $articles_start_char[$index];
 402                                 }
 403
 404                                 $r .= "<li>{$articles[$index]}</li>";
 405                         }
 406                         if( !$atColumnTop ) {
 407                                 $r .= "</ul>\n";
 408                         }
 409                         $r .= "</td>\n";
 410
 411
 412                 }
 413                 $r .= '</tr></table>';
 414                 return $r;
 415         }
 416
 417         /**
 418          * Format a list of articles chunked by letter in a bullet list.
 419          * @param $articles Array
 420          * @param $articles_start_char Array
 421          * @return String
 422          * @private
 423          */
 424         function shortList( $articles, $articles_start_char ) {
 425                 $r = '<h3>' . htmlspecialchars( $articles_start_char[0] ) . "</h3>\n";
 426                 $r .= '<ul><li>'.$articles[0].'</li>';
 427                 for ($index = 1; $index < count($articles); $index++ )
 428                 {
 429                         if ($articles_start_char[$index] != $articles_start_char[$index - 1])
 430                         {
 431                                 $r .= "</ul><h3>" . htmlspecialchars( $articles_start_char[$index] ) . "</h3>\n<ul>";
 432                         }
 433
 434                         $r .= "<li>{$articles[$index]}</li>";
 435                 }
 436                 $r .= '</ul>';
 437                 return $r;
 438         }
 439
 440         /**
 441          * @param $title Title object
 442          * @param $first String
 443          * @param $last String
 444          * @param $limit Int
 445          * @param $query Array: additional query options to pass
 446          * @return String
 447          * @private
 448          */
 449         function pagingLinks( $title, $first, $last, $limit, $query = array() ) {
 450                 global $wgLang;
 451                 $sk = $this->getSkin();
 452                 $limitText = $wgLang->formatNum( $limit );
 453
 454                 $prevLink = htmlspecialchars( wfMsg( 'prevn', $limitText ) );
 455                 if( $first != '' ) {
 456                         $prevLink = $sk->makeLinkObj( $title, $prevLink,
 457                                 wfArrayToCGI( $query + array( 'until' => $first ) ) );
 458                 }
 459                 $nextLink = htmlspecialchars( wfMsg( 'nextn', $limitText ) );
 460                 if( $last != '' ) {
 461                         $nextLink = $sk->makeLinkObj( $title, $nextLink,
 462                                 wfArrayToCGI( $query + array( 'from' => $last ) ) );
 463                 }
 464
 465                 return "($prevLink) ($nextLink)";
 466         }
 467
 468         /**
 469          * What to do if the category table conflicts with the number of results
 470          * returned?  This function says what.  It works the same whether the
 471          * things being counted are articles, subcategories, or files.
 472          *
 473          * Note for grepping: uses the messages category-article-count,
 474          * category-article-count-limited, category-subcat-count,
 475          * category-subcat-count-limited, category-file-count,
 476          * category-file-count-limited.
 477          *
 478          * @param $rescnt Int: The number of items returned by our database query.
 479          * @param $dbcnt Int: The number of items according to the category table.
 480          * @param $type String: 'subcat', 'article', or 'file'
 481          * @return String: A message giving the number of items, to output to HTML.
 482          */
 483         private function getCountMessage( $rescnt, $dbcnt, $type ) {
 484                 global $wgLang;
 485                 # There are three cases:
 486                 #   1) The category table figure seems sane.  It might be wrong, but
 487                 #      we can't do anything about it if we don't recalculate it on ev-
 488                 #      ery category view.
 489                 #   2) The category table figure isn't sane, like it's smaller than the
 490                 #      number of actual results, *but* the number of results is less
 491                 #      than $this->limit and there's no offset.  In this case we still
 492                 #      know the right figure.
 493                 #   3) We have no idea.
 494                 $totalrescnt = count( $this->articles ) + count( $this->children ) +
 495                         ($this->showGallery ? $this->gallery->count() : 0);
 496                 if($dbcnt == $rescnt || (($totalrescnt == $this->limit || $this->from
 497                 || $this->until) && $dbcnt > $rescnt)){
 498                         # Case 1: seems sane.
 499                         $totalcnt = $dbcnt;
 500                 } elseif($totalrescnt < $this->limit && !$this->from && !$this->until){
 501                         # Case 2: not sane, but salvageable.  Use the number of results.
 502                         # Since there are fewer than 200, we can also take this opportunity
 503                         # to refresh the incorrect category table entry -- which should be
 504                         # quick due to the small number of entries.
 505                         $totalcnt = $rescnt;
 506                         $this->cat->refreshCounts();
 507                 } else {
 508                         # Case 3: hopeless.  Don't give a total count at all.
 509                         return wfMsgExt("category-$type-count-limited", 'parse',
 510                                 $wgLang->formatNum( $rescnt ) );
 511                 }
 512                 return wfMsgExt( "category-$type-count", 'parse', $wgLang->formatNum( $rescnt ),
 513                         $wgLang->formatNum( $totalcnt ) );
 514         }
 515 }