includes/CategoryPage.php

   1 <?php
   2 /**
   3  * Special handling for category description pages.
   4  * Modelled after ImagePage.php.
   5  *
   6  * @file
   7  */
   8
   9 if ( !defined( 'MEDIAWIKI' ) )
  10         die( 1 );
  11
  12 /**
  13  * Special handling for category description pages, showing pages,
  14  * subcategories and file that belong to the category
  15  */
  16 class CategoryPage extends Article {
  17         # Subclasses can change this to override the viewer class.
  18         protected $mCategoryViewerClass = 'CategoryViewer';
  19
  20         function view() {
  21                 global $wgRequest, $wgUser;
  22
  23                 $diff = $wgRequest->getVal( 'diff' );
  24                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
  25
  26                 if ( isset( $diff ) && $diffOnly ) {
  27                         return parent::view();
  28                 }
  29
  30                 if ( !wfRunHooks( 'CategoryPageView', array( &$this ) ) ) {
  31                         return;
  32                 }
  33
  34                 if ( NS_CATEGORY == $this->mTitle->getNamespace() ) {
  35                         $this->openShowCategory();
  36                 }
  37
  38                 parent::view();
  39
  40                 if ( NS_CATEGORY == $this->mTitle->getNamespace() ) {
  41                         $this->closeShowCategory();
  42                 }
  43         }
  44
  45         /**
  46          * Don't return a 404 for categories in use.
  47          * In use defined as: either the actual page exists
  48          * or the category currently has members.
  49          */
  50         function hasViewableContent() {
  51                 if ( parent::hasViewableContent() ) {
  52                         return true;
  53                 } else {
  54                         $cat = Category::newFromTitle( $this->mTitle );
  55                         // If any of these are not 0, then has members
  56                         if ( $cat->getPageCount()
  57                                 || $cat->getSubcatCount()
  58                                 || $cat->getFileCount()
  59                         ) {
  60                                 return true;
  61                         }
  62                 }
  63                 return false;
  64         }
  65
  66         function openShowCategory() {
  67                 # For overloading
  68         }
  69
  70         function closeShowCategory() {
  71                 global $wgOut, $wgRequest;
  72
  73                 // Use these as defaults for back compat --catrope
  74                 $oldFrom = $wgRequest->getVal( 'from' );
  75                 $oldUntil = $wgRequest->getVal( 'until' );
  76
  77                 $from = $until = array();
  78                 foreach ( array( 'page', 'subcat', 'file' ) as $type ) {
  79                         $from[$type] = $wgRequest->getVal( "{$type}from", $oldFrom );
  80                         $until[$type] = $wgRequest->getVal( "{$type}until", $oldUntil );
  81                 }
  82
  83                 $viewer = new $this->mCategoryViewerClass( $this->mTitle, $from, $until, $wgRequest->getValues() );
  84                 $wgOut->addHTML( $viewer->getHTML() );
  85         }
  86 }
  87
  88 class CategoryViewer {
  89         var $limit, $from, $until,
  90                 $articles, $articles_start_char,
  91                 $children, $children_start_char,
  92                 $showGallery, $imgsNoGalley,
  93                 $imgsNoGallery_start_char,
  94                 $skin, $imgsNoGallery;
  95
  96         /**
  97          * @var
  98          */
  99         var $nextPage;
 100
 101         /**
 102          * @var Array
 103          */
 104         var $flip;
 105
 106         /**
 107          * @var Title
 108          */
 109         var $title;
 110
 111         /**
 112          * @var Collation
 113          */
 114         var $collation;
 115
 116         /**
 117          * @var ImageGallery
 118          */
 119         var $gallery;
 120
 121         /**
 122          * Category object for this page
 123          * @var Category
 124          */
 125         private $cat;
 126
 127         /**
 128          * The original query array, to be used in generating paging links.
 129          * @var array
 130          */
 131         private $query;
 132
 133         function __construct( $title, $from = '', $until = '', $query = array() ) {
 134                 global $wgCategoryPagingLimit;
 135                 $this->title = $title;
 136                 $this->from = $from;
 137                 $this->until = $until;
 138                 $this->limit = $wgCategoryPagingLimit;
 139                 $this->cat = Category::newFromTitle( $title );
 140                 $this->query = $query;
 141                 $this->collation = Collation::singleton();
 142                 unset( $this->query['title'] );
 143         }
 144
 145         /**
 146          * Format the category data list.
 147          *
 148          * @return string HTML output
 149          */
 150         public function getHTML() {
 151                 global $wgOut, $wgCategoryMagicGallery, $wgContLang;
 152                 wfProfileIn( __METHOD__ );
 153
 154                 $this->showGallery = $wgCategoryMagicGallery && !$wgOut->mNoGallery;
 155
 156                 $this->clearCategoryState();
 157                 $this->doCategoryQuery();
 158                 $this->finaliseCategoryState();
 159
 160                 $r = $this->getSubcategorySection() .
 161                         $this->getPagesSection() .
 162                         $this->getImageSection();
 163
 164                 if ( $r == '' ) {
 165                         // If there is no category content to display, only
 166                         // show the top part of the navigation links.
 167                         // FIXME: cannot be completely suppressed because it
 168                         //        is unknown if 'until' or 'from' makes this
 169                         //        give 0 results.
 170                         $r = $r . $this->getCategoryTop();
 171                 } else {
 172                         $r = $this->getCategoryTop() .
 173                                 $r .
 174                                 $this->getCategoryBottom();
 175                 }
 176
 177                 // Give a proper message if category is empty
 178                 if ( $r == '' ) {
 179                         $r = wfMsgExt( 'category-empty', array( 'parse' ) );
 180                 }
 181
 182                 wfProfileOut( __METHOD__ );
 183                 return $wgContLang->convert( $r );
 184         }
 185
 186         function clearCategoryState() {
 187                 $this->articles = array();
 188                 $this->articles_start_char = array();
 189                 $this->children = array();
 190                 $this->children_start_char = array();
 191                 if ( $this->showGallery ) {
 192                         $this->gallery = new ImageGallery();
 193                         $this->gallery->setHideBadImages();
 194                 } else {
 195                         $this->imgsNoGallery = array();
 196                         $this->imgsNoGallery_start_char = array();
 197                 }
 198         }
 199
 200         /**
 201          * @return Skin
 202          */
 203         function getSkin() {
 204                 if ( !$this->skin ) {
 205                         global $wgUser;
 206                         $this->skin = $wgUser->getSkin();
 207                 }
 208                 return $this->skin;
 209         }
 210
 211         /**
 212          * Add a subcategory to the internal lists, using a Category object
 213          */
 214         function addSubcategoryObject( Category $cat, $sortkey, $pageLength ) {
 215                 // Subcategory; strip the 'Category' namespace from the link text.
 216                 $title = $cat->getTitle();
 217
 218                 $link = $this->getSkin()->link( $title, $title->getText() );
 219                 if ( $title->isRedirect() ) {
 220                         // This didn't used to add redirect-in-category, but might
 221                         // as well be consistent with the rest of the sections
 222                         // on a category page.
 223                         $link = '<span class="redirect-in-category">' . $link . '</span>';
 224                 }
 225                 $this->children[] = $link;
 226
 227                 $this->children_start_char[] =
 228                         $this->getSubcategorySortChar( $cat->getTitle(), $sortkey );
 229         }
 230
 231         /**
 232          * Add a subcategory to the internal lists, using a title object
 233          * @deprecated kept for compatibility, please use addSubcategoryObject instead
 234          */
 235         function addSubcategory( Title $title, $sortkey, $pageLength ) {
 236                 $this->addSubcategoryObject( Category::newFromTitle( $title ), $sortkey, $pageLength );
 237         }
 238
 239         /**
 240         * Get the character to be used for sorting subcategories.
 241         * If there's a link from Category:A to Category:B, the sortkey of the resulting
 242         * entry in the categorylinks table is Category:A, not A, which it SHOULD be.
 243         * Workaround: If sortkey == "Category:".$title, than use $title for sorting,
 244         * else use sortkey...
 245         *
 246         * @param Title $title
 247         * @param string $sortkey The human-readable sortkey (before transforming to icu or whatever).
 248         */
 249         function getSubcategorySortChar( $title, $sortkey ) {
 250                 global $wgContLang;
 251
 252                 if ( $title->getPrefixedText() == $sortkey ) {
 253                         $word = $title->getDBkey();
 254                 } else {
 255                         $word = $sortkey;
 256                 }
 257
 258                 $firstChar = $this->collation->getFirstLetter( $word );
 259
 260                 return $wgContLang->convert( $firstChar );
 261         }
 262
 263         /**
 264          * Add a page in the image namespace
 265          */
 266         function addImage( Title $title, $sortkey, $pageLength, $isRedirect = false ) {
 267                 global $wgContLang;
 268                 if ( $this->showGallery ) {
 269                         $flip = $this->flip['file'];
 270                         if ( $flip ) {
 271                                 $this->gallery->insert( $title );
 272                         } else {
 273                                 $this->gallery->add( $title );
 274                         }
 275                 } else {
 276                         $link = $this->getSkin()->link( $title );
 277                         if ( $isRedirect ) {
 278                                 // This seems kind of pointless given 'mw-redirect' class,
 279                                 // but keeping for back-compatibility with user css.
 280                                 $link = '<span class="redirect-in-category">' . $link . '</span>';
 281                         }
 282                         $this->imgsNoGallery[] = $link;
 283
 284                         $this->imgsNoGallery_start_char[] = $wgContLang->convert(
 285                                 $this->collation->getFirstLetter( $sortkey ) );
 286                 }
 287         }
 288
 289         /**
 290          * Add a miscellaneous page
 291          */
 292         function addPage( $title, $sortkey, $pageLength, $isRedirect = false ) {
 293                 global $wgContLang;
 294
 295                 $link = $this->getSkin()->link( $title );
 296                 if ( $isRedirect ) {
 297                         // This seems kind of pointless given 'mw-redirect' class,
 298                         // but keeping for back-compatiability with user css.
 299                         $link = '<span class="redirect-in-category">' . $link . '</span>';
 300                 }
 301                 $this->articles[] = $link;
 302
 303                 $this->articles_start_char[] = $wgContLang->convert(
 304                         $this->collation->getFirstLetter( $sortkey ) );
 305         }
 306
 307         function finaliseCategoryState() {
 308                 if ( $this->flip['subcat'] ) {
 309                         $this->children            = array_reverse( $this->children );
 310                         $this->children_start_char = array_reverse( $this->children_start_char );
 311                 }
 312                 if ( $this->flip['page'] ) {
 313                         $this->articles            = array_reverse( $this->articles );
 314                         $this->articles_start_char = array_reverse( $this->articles_start_char );
 315                 }
 316                 if ( !$this->showGallery && $this->flip['file'] ) {
 317                         $this->imgsNoGallery            = array_reverse( $this->imgsNoGallery );
 318                         $this->imgsNoGallery_start_char = array_reverse( $this->imgsNoGallery_start_char );
 319                 }
 320         }
 321
 322         function doCategoryQuery() {
 323                 $dbr = wfGetDB( DB_SLAVE, 'category' );
 324
 325                 $this->nextPage = array(
 326                         'page' => null,
 327                         'subcat' => null,
 328                         'file' => null,
 329                 );
 330                 $this->flip = array( 'page' => false, 'subcat' => false, 'file' => false );
 331
 332                 foreach ( array( 'page', 'subcat', 'file' ) as $type ) {
 333                         # Get the sortkeys for start/end, if applicable.  Note that if
 334                         # the collation in the database differs from the one
 335                         # set in $wgCategoryCollation, pagination might go totally haywire.
 336                         $extraConds = array( 'cl_type' => $type );
 337                         if ( $this->from[$type] !== null ) {
 338                                 $extraConds[] = 'cl_sortkey >= '
 339                                         . $dbr->addQuotes( $this->collation->getSortKey( $this->from[$type] ) );
 340                         } elseif ( $this->until[$type] !== null ) {
 341                                 $extraConds[] = 'cl_sortkey < '
 342                                         . $dbr->addQuotes( $this->collation->getSortKey( $this->until[$type] ) );
 343                                 $this->flip[$type] = true;
 344                         }
 345
 346                         $res = $dbr->select(
 347                                 array( 'page', 'categorylinks', 'category' ),
 348                                 array( 'page_id', 'page_title', 'page_namespace', 'page_len',
 349                                         'page_is_redirect', 'cl_sortkey', 'cat_id', 'cat_title',
 350                                         'cat_subcats', 'cat_pages', 'cat_files', 'cl_sortkey_prefix' ),
 351                                 array_merge( array( 'cl_to' => $this->title->getDBkey() ),  $extraConds ),
 352                                 __METHOD__,
 353                                 array(
 354                                         'USE INDEX' => array( 'categorylinks' => 'cl_sortkey' ),
 355                                         'LIMIT' => $this->limit + 1,
 356                                         'ORDER BY' => $this->flip[$type] ? 'cl_sortkey DESC' : 'cl_sortkey',
 357                                 ),
 358                                 array(
 359                                         'categorylinks'  => array( 'INNER JOIN', 'cl_from = page_id' ),
 360                                         'category' => array( 'LEFT JOIN', 'cat_title = page_title AND page_namespace = ' . NS_CATEGORY )
 361                                 )
 362                         );
 363
 364                         $count = 0;
 365                         foreach ( $res as $row ) {
 366                                 $title = Title::newFromRow( $row );
 367                                 $humanSortkey = $title->getCategorySortkey( $row->cl_sortkey_prefix );
 368
 369                                 if ( ++$count > $this->limit ) {
 370                                         # We've reached the one extra which shows that there
 371                                         # are additional pages to be had. Stop here...
 372                                         $this->nextPage[$type] = $humanSortkey;
 373                                         break;
 374                                 }
 375
 376                                 if ( $title->getNamespace() == NS_CATEGORY ) {
 377                                         $cat = Category::newFromRow( $row, $title );
 378                                         $this->addSubcategoryObject( $cat, $humanSortkey, $row->page_len );
 379                                 } elseif ( $title->getNamespace() == NS_FILE ) {
 380                                         $this->addImage( $title, $humanSortkey, $row->page_len, $row->page_is_redirect );
 381                                 } else {
 382                                         $this->addPage( $title, $humanSortkey, $row->page_len, $row->page_is_redirect );
 383                                 }
 384                         }
 385                 }
 386         }
 387
 388         function getCategoryTop() {
 389                 $r = $this->getCategoryBottom();
 390                 return $r === ''
 391                         ? $r
 392                         : "<br style=\"clear:both;\"/>\n" . $r;
 393         }
 394
 395         function getSubcategorySection() {
 396                 # Don't show subcategories section if there are none.
 397                 $r = '';
 398                 $rescnt = count( $this->children );
 399                 $dbcnt = $this->cat->getSubcatCount();
 400                 $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'subcat' );
 401
 402                 if ( $rescnt > 0 ) {
 403                         # Showing subcategories
 404                         $r .= "<div id=\"mw-subcategories\">\n";
 405                         $r .= '<h2>' . wfMsg( 'subcategories' ) . "</h2>\n";
 406                         $r .= $countmsg;
 407                         $r .= $this->getSectionPagingLinks( 'subcat' );
 408                         $r .= $this->formatList( $this->children, $this->children_start_char );
 409                         $r .= $this->getSectionPagingLinks( 'subcat' );
 410                         $r .= "\n</div>";
 411                 }
 412                 return $r;
 413         }
 414
 415         function getPagesSection() {
 416                 $ti = htmlspecialchars( $this->title->getText() );
 417                 # Don't show articles section if there are none.
 418                 $r = '';
 419
 420                 # FIXME, here and in the other two sections: we don't need to bother
 421                 # with this rigamarole if the entire category contents fit on one page
 422                 # and have already been retrieved.  We can just use $rescnt in that
 423                 # case and save a query and some logic.
 424                 $dbcnt = $this->cat->getPageCount() - $this->cat->getSubcatCount()
 425                         - $this->cat->getFileCount();
 426                 $rescnt = count( $this->articles );
 427                 $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'article' );
 428
 429                 if ( $rescnt > 0 ) {
 430                         $r = "<div id=\"mw-pages\">\n";
 431                         $r .= '<h2>' . wfMsg( 'category_header', $ti ) . "</h2>\n";
 432                         $r .= $countmsg;
 433                         $r .= $this->getSectionPagingLinks( 'page' );
 434                         $r .= $this->formatList( $this->articles, $this->articles_start_char );
 435                         $r .= $this->getSectionPagingLinks( 'page' );
 436                         $r .= "\n</div>";
 437                 }
 438                 return $r;
 439         }
 440
 441         function getImageSection() {
 442                 $r = '';
 443                 $rescnt = $this->showGallery ? $this->gallery->count() : count( $this->imgsNoGallery );
 444                 if ( $rescnt > 0 ) {
 445                         $dbcnt = $this->cat->getFileCount();
 446                         $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'file' );
 447
 448                         $r .= "<div id=\"mw-category-media\">\n";
 449                         $r .= '<h2>' . wfMsg( 'category-media-header', htmlspecialchars( $this->title->getText() ) ) . "</h2>\n";
 450                         $r .= $countmsg;
 451                         $r .= $this->getSectionPagingLinks( 'file' );
 452                         if ( $this->showGallery ) {
 453                                 $r .= $this->gallery->toHTML();
 454                         } else {
 455                                 $r .= $this->formatList( $this->imgsNoGallery, $this->imgsNoGallery_start_char );
 456                         }
 457                         $r .= $this->getSectionPagingLinks( 'file' );
 458                         $r .= "\n</div>";
 459                 }
 460                 return $r;
 461         }
 462
 463         /**
 464          * Get the paging links for a section (subcats/pages/files), to go at the top and bottom
 465          * of the output.
 466          *
 467          * @param $type String: 'page', 'subcat', or 'file'
 468          * @return String: HTML output, possibly empty if there are no other pages
 469          */
 470         private function getSectionPagingLinks( $type ) {
 471                 if ( $this->until[$type] !== null ) {
 472                         return $this->pagingLinks( $this->nextPage[$type], $this->until[$type], $type );
 473                 } elseif ( $this->nextPage[$type] !== null || $this->from[$type] !== null ) {
 474                         return $this->pagingLinks( $this->from[$type], $this->nextPage[$type], $type );
 475                 } else {
 476                         return '';
 477                 }
 478         }
 479
 480         function getCategoryBottom() {
 481                 return '';
 482         }
 483
 484         /**
 485          * Format a list of articles chunked by letter, either as a
 486          * bullet list or a columnar format, depending on the length.
 487          *
 488          * @param $articles Array
 489          * @param $articles_start_char Array
 490          * @param $cutoff Int
 491          * @return String
 492          * @private
 493          */
 494         function formatList( $articles, $articles_start_char, $cutoff = 6 ) {
 495                 if ( count ( $articles ) > $cutoff ) {
 496                         return self::columnList( $articles, $articles_start_char );
 497                 } elseif ( count( $articles ) > 0 ) {
 498                         // for short lists of articles in categories.
 499                         return self::shortList( $articles, $articles_start_char );
 500                 }
 501                 return '';
 502         }
 503
 504         /**
 505          * Format a list of articles chunked by letter in a three-column
 506          * list, ordered vertically.
 507          *
 508          * TODO: Take the headers into account when creating columns, so they're
 509          * more visually equal.
 510          *
 511          * More distant TODO: Scrap this and use CSS columns, whenever IE finally
 512          * supports those.
 513          *
 514          * @param $articles Array
 515          * @param $articles_start_char Array
 516          * @return String
 517          * @private
 518          */
 519         static function columnList( $articles, $articles_start_char ) {
 520                 $columns = array_combine( $articles, $articles_start_char );
 521                 # Split into three columns
 522                 $columns = array_chunk( $columns, ceil( count( $columns ) / 3 ), true /* preserve keys */ );
 523
 524                 $ret = '<table width="100%"><tr valign="top"><td>';
 525                 $prevchar = null;
 526
 527                 foreach ( $columns as $column ) {
 528                         $colContents = array();
 529
 530                         # Kind of like array_flip() here, but we keep duplicates in an
 531                         # array instead of dropping them.
 532                         foreach ( $column as $article => $char ) {
 533                                 if ( !isset( $colContents[$char] ) ) {
 534                                         $colContents[$char] = array();
 535                                 }
 536                                 $colContents[$char][] = $article;
 537                         }
 538
 539                         $first = true;
 540                         foreach ( $colContents as $char => $articles ) {
 541                                 $ret .= '<h3>' . htmlspecialchars( $char );
 542                                 if ( $first && $char === $prevchar ) {
 543                                         # We're continuing a previous chunk at the top of a new
 544                                         # column, so add " cont." after the letter.
 545                                         $ret .= ' ' . wfMsgHtml( 'listingcontinuesabbrev' );
 546                                 }
 547                                 $ret .= "</h3>\n";
 548
 549                                 $ret .= '<ul><li>';
 550                                 $ret .= implode( "</li>\n<li>", $articles );
 551                                 $ret .= '</li></ul>';
 552
 553                                 $first = false;
 554                                 $prevchar = $char;
 555                         }
 556
 557                         $ret .= "</td>\n<td>";
 558                 }
 559
 560                 $ret .= '</td></tr></table>';
 561                 return $ret;
 562         }
 563
 564         /**
 565          * Format a list of articles chunked by letter in a bullet list.
 566          * @param $articles Array
 567          * @param $articles_start_char Array
 568          * @return String
 569          * @private
 570          */
 571         static function shortList( $articles, $articles_start_char ) {
 572                 $r = '<h3>' . htmlspecialchars( $articles_start_char[0] ) . "</h3>\n";
 573                 $r .= '<ul><li>' . $articles[0] . '</li>';
 574                 for ( $index = 1; $index < count( $articles ); $index++ ) {
 575                         if ( $articles_start_char[$index] != $articles_start_char[$index - 1] ) {
 576                                 $r .= "</ul><h3>" . htmlspecialchars( $articles_start_char[$index] ) . "</h3>\n<ul>";
 577                         }
 578
 579                         $r .= "<li>{$articles[$index]}</li>";
 580                 }
 581                 $r .= '</ul>';
 582                 return $r;
 583         }
 584
 585         /**
 586          * Create paging links, as a helper method to getSectionPagingLinks().
 587          *
 588          * @param $first String The 'until' parameter for the generated URL
 589          * @param $last String The 'from' parameter for the genererated URL
 590          * @param $type String A prefix for parameters, 'page' or 'subcat' or
 591          *     'file'
 592          * @return String HTML
 593          */
 594         private function pagingLinks( $first, $last, $type = '' ) {
 595                 global $wgLang;
 596                 $sk = $this->getSkin();
 597                 $limitText = $wgLang->formatNum( $this->limit );
 598
 599                 $prevLink = wfMsgExt( 'prevn', array( 'escape', 'parsemag' ), $limitText );
 600
 601                 if ( $first != '' ) {
 602                         $prevQuery = $this->query;
 603                         $prevQuery["{$type}until"] = $first;
 604                         unset( $prevQuery["{$type}from"] );
 605                         $prevLink = $sk->linkKnown(
 606                                 $this->title,
 607                                 $prevLink,
 608                                 array(),
 609                                 $prevQuery
 610                         );
 611                 }
 612
 613                 $nextLink = wfMsgExt( 'nextn', array( 'escape', 'parsemag' ), $limitText );
 614
 615                 if ( $last != '' ) {
 616                         $lastQuery = $this->query;
 617                         $lastQuery["{$type}from"] = $last;
 618                         unset( $lastQuery["{$type}until"] );
 619                         $nextLink = $sk->linkKnown(
 620                                 $this->title,
 621                                 $nextLink,
 622                                 array(),
 623                                 $lastQuery
 624                         );
 625                 }
 626
 627                 return "($prevLink) ($nextLink)";
 628         }
 629
 630         /**
 631          * What to do if the category table conflicts with the number of results
 632          * returned?  This function says what. Each type is considered independently
 633          * of the other types.
 634          *
 635          * Note for grepping: uses the messages category-article-count,
 636          * category-article-count-limited, category-subcat-count,
 637          * category-subcat-count-limited, category-file-count,
 638          * category-file-count-limited.
 639          *
 640          * @param $rescnt Int: The number of items returned by our database query.
 641          * @param $dbcnt Int: The number of items according to the category table.
 642          * @param $type String: 'subcat', 'article', or 'file'
 643          * @return String: A message giving the number of items, to output to HTML.
 644          */
 645         private function getCountMessage( $rescnt, $dbcnt, $type ) {
 646                 global $wgLang;
 647                 # There are three cases:
 648                 #   1) The category table figure seems sane.  It might be wrong, but
 649                 #      we can't do anything about it if we don't recalculate it on ev-
 650                 #      ery category view.
 651                 #   2) The category table figure isn't sane, like it's smaller than the
 652                 #      number of actual results, *but* the number of results is less
 653                 #      than $this->limit and there's no offset.  In this case we still
 654                 #      know the right figure.
 655                 #   3) We have no idea.
 656
 657                 # Check if there's a "from" or "until" for anything
 658
 659                 // This is a little ugly, but we seem to use different names
 660                 // for the paging types then for the messages.
 661                 if ( $type === 'article' ) {
 662                         $pagingType = 'page';
 663                 } else {
 664                         $pagingType = $type;
 665                 }
 666
 667                 $fromOrUntil = false;
 668                 if ( $this->from[$pagingType] !== null || $this->until[$pagingType] !== null ) {
 669                         $fromOrUntil = true;
 670                 }
 671
 672                 if ( $dbcnt == $rescnt || ( ( $rescnt == $this->limit || $fromOrUntil )
 673                         && $dbcnt > $rescnt ) ) {
 674                         # Case 1: seems sane.
 675                         $totalcnt = $dbcnt;
 676                 } elseif ( $rescnt < $this->limit && !$fromOrUntil ) {
 677                         # Case 2: not sane, but salvageable.  Use the number of results.
 678                         # Since there are fewer than 200, we can also take this opportunity
 679                         # to refresh the incorrect category table entry -- which should be
 680                         # quick due to the small number of entries.
 681                         $totalcnt = $rescnt;
 682                         $this->cat->refreshCounts();
 683                 } else {
 684                         # Case 3: hopeless.  Don't give a total count at all.
 685                         return wfMsgExt( "category-$type-count-limited", 'parse',
 686                                 $wgLang->formatNum( $rescnt ) );
 687                 }
 688                 return wfMsgExt(
 689                         "category-$type-count",
 690                         'parse',
 691                         $wgLang->formatNum( $rescnt ),
 692                         $wgLang->formatNum( $totalcnt )
 693                 );
 694         }
 695 }