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