includes/CategoryPage.php

   1 <?php
   2 /**
   3  * Class for viewing MediaWiki 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         protected function newPage( Title $title ) {
  21                 // Overload mPage with a category-specific page
  22                 return new WikiCategoryPage( $title );
  23         }
  24
  25         /**
  26          * Constructor from a page id
  27          * @param $id Int article ID to load
  28          */
  29         public static function newFromID( $id ) {
  30                 $t = Title::newFromID( $id );
  31                 # @todo FIXME: Doesn't inherit right
  32                 return $t == null ? null : new self( $t );
  33                 # return $t == null ? null : new static( $t ); // PHP 5.3
  34         }
  35
  36         function view() {
  37                 global $wgRequest, $wgUser;
  38
  39                 $diff = $wgRequest->getVal( 'diff' );
  40                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
  41
  42                 if ( isset( $diff ) && $diffOnly ) {
  43                         return parent::view();
  44                 }
  45
  46                 if ( !wfRunHooks( 'CategoryPageView', array( &$this ) ) ) {
  47                         return;
  48                 }
  49
  50                 if ( NS_CATEGORY == $this->mTitle->getNamespace() ) {
  51                         $this->openShowCategory();
  52                 }
  53
  54                 parent::view();
  55
  56                 if ( NS_CATEGORY == $this->mTitle->getNamespace() ) {
  57                         $this->closeShowCategory();
  58                 }
  59         }
  60
  61         function openShowCategory() {
  62                 # For overloading
  63         }
  64
  65         function closeShowCategory() {
  66                 global $wgOut, $wgRequest;
  67
  68                 // Use these as defaults for back compat --catrope
  69                 $oldFrom = $wgRequest->getVal( 'from' );
  70                 $oldUntil = $wgRequest->getVal( 'until' );
  71
  72                 $from = $until = array();
  73                 foreach ( array( 'page', 'subcat', 'file' ) as $type ) {
  74                         $from[$type] = $wgRequest->getVal( "{$type}from", $oldFrom );
  75                         $until[$type] = $wgRequest->getVal( "{$type}until", $oldUntil );
  76                 }
  77
  78                 $viewer = new $this->mCategoryViewerClass( $this->mTitle, $from, $until, $wgRequest->getValues() );
  79                 $wgOut->addHTML( $viewer->getHTML() );
  80         }
  81 }
  82
  83 class CategoryViewer {
  84         var $limit, $from, $until,
  85                 $articles, $articles_start_char,
  86                 $children, $children_start_char,
  87                 $showGallery, $imgsNoGalley,
  88                 $imgsNoGallery_start_char,
  89                 $imgsNoGallery;
  90
  91         /**
  92          * @var
  93          */
  94         var $nextPage;
  95
  96         /**
  97          * @var Array
  98          */
  99         var $flip;
 100
 101         /**
 102          * @var Title
 103          */
 104         var $title;
 105
 106         /**
 107          * @var Collation
 108          */
 109         var $collation;
 110
 111         /**
 112          * @var ImageGallery
 113          */
 114         var $gallery;
 115
 116         /**
 117          * Category object for this page
 118          * @var Category
 119          */
 120         private $cat;
 121
 122         /**
 123          * The original query array, to be used in generating paging links.
 124          * @var array
 125          */
 126         private $query;
 127
 128         function __construct( $title, $from = '', $until = '', $query = array() ) {
 129                 global $wgCategoryPagingLimit;
 130                 $this->title = $title;
 131                 $this->from = $from;
 132                 $this->until = $until;
 133                 $this->limit = $wgCategoryPagingLimit;
 134                 $this->cat = Category::newFromTitle( $title );
 135                 $this->query = $query;
 136                 $this->collation = Collation::singleton();
 137                 unset( $this->query['title'] );
 138         }
 139
 140         /**
 141          * Format the category data list.
 142          *
 143          * @return string HTML output
 144          */
 145         public function getHTML() {
 146                 global $wgOut, $wgCategoryMagicGallery, $wgLang;
 147                 wfProfileIn( __METHOD__ );
 148
 149                 $this->showGallery = $wgCategoryMagicGallery && !$wgOut->mNoGallery;
 150
 151                 $this->clearCategoryState();
 152                 $this->doCategoryQuery();
 153                 $this->finaliseCategoryState();
 154
 155                 $r = $this->getSubcategorySection() .
 156                         $this->getPagesSection() .
 157                         $this->getImageSection();
 158
 159                 if ( $r == '' ) {
 160                         // If there is no category content to display, only
 161                         // show the top part of the navigation links.
 162                         // @todo FIXME: Cannot be completely suppressed because it
 163                         //        is unknown if 'until' or 'from' makes this
 164                         //        give 0 results.
 165                         $r = $r . $this->getCategoryTop();
 166                 } else {
 167                         $r = $this->getCategoryTop() .
 168                                 $r .
 169                                 $this->getCategoryBottom();
 170                 }
 171
 172                 // Give a proper message if category is empty
 173                 if ( $r == '' ) {
 174                         $r = wfMsgExt( 'category-empty', array( 'parse' ) );
 175                 }
 176
 177                 $langAttribs = array( 'lang' => $wgLang->getCode(), 'dir' => $wgLang->getDir() );
 178                 # put a div around the headings which are in the user language
 179                 $r = Html::openElement( 'div', $langAttribs ) . $r . '</div>';
 180
 181                 wfProfileOut( __METHOD__ );
 182                 return $r;
 183         }
 184
 185         function clearCategoryState() {
 186                 $this->articles = array();
 187                 $this->articles_start_char = array();
 188                 $this->children = array();
 189                 $this->children_start_char = array();
 190                 if ( $this->showGallery ) {
 191                         $this->gallery = new ImageGallery();
 192                         $this->gallery->setHideBadImages();
 193                 } else {
 194                         $this->imgsNoGallery = array();
 195                         $this->imgsNoGallery_start_char = array();
 196                 }
 197         }
 198
 199         /**
 200          * Add a subcategory to the internal lists, using a Category object
 201          */
 202         function addSubcategoryObject( Category $cat, $sortkey, $pageLength ) {
 203                 // Subcategory; strip the 'Category' namespace from the link text.
 204                 $title = $cat->getTitle();
 205
 206                 $link = Linker::link( $title, htmlspecialchars( $title->getText() ) );
 207                 if ( $title->isRedirect() ) {
 208                         // This didn't used to add redirect-in-category, but might
 209                         // as well be consistent with the rest of the sections
 210                         // on a category page.
 211                         $link = '<span class="redirect-in-category">' . $link . '</span>';
 212                 }
 213                 $this->children[] = $link;
 214
 215                 $this->children_start_char[] =
 216                         $this->getSubcategorySortChar( $cat->getTitle(), $sortkey );
 217         }
 218
 219         /**
 220          * Add a subcategory to the internal lists, using a title object
 221          * @deprecated since 1.17 kept for compatibility, please use addSubcategoryObject instead
 222          */
 223         function addSubcategory( Title $title, $sortkey, $pageLength ) {
 224                 $this->addSubcategoryObject( Category::newFromTitle( $title ), $sortkey, $pageLength );
 225         }
 226
 227         /**
 228         * Get the character to be used for sorting subcategories.
 229         * If there's a link from Category:A to Category:B, the sortkey of the resulting
 230         * entry in the categorylinks table is Category:A, not A, which it SHOULD be.
 231         * Workaround: If sortkey == "Category:".$title, than use $title for sorting,
 232         * else use sortkey...
 233         *
 234         * @param Title $title
 235         * @param string $sortkey The human-readable sortkey (before transforming to icu or whatever).
 236         */
 237         function getSubcategorySortChar( $title, $sortkey ) {
 238                 global $wgContLang;
 239
 240                 if ( $title->getPrefixedText() == $sortkey ) {
 241                         $word = $title->getDBkey();
 242                 } else {
 243                         $word = $sortkey;
 244                 }
 245
 246                 $firstChar = $this->collation->getFirstLetter( $word );
 247
 248                 return $wgContLang->convert( $firstChar );
 249         }
 250
 251         /**
 252          * Add a page in the image namespace
 253          */
 254         function addImage( Title $title, $sortkey, $pageLength, $isRedirect = false ) {
 255                 global $wgContLang;
 256                 if ( $this->showGallery ) {
 257                         $flip = $this->flip['file'];
 258                         if ( $flip ) {
 259                                 $this->gallery->insert( $title );
 260                         } else {
 261                                 $this->gallery->add( $title );
 262                         }
 263                 } else {
 264                         $link = Linker::link( $title );
 265                         if ( $isRedirect ) {
 266                                 // This seems kind of pointless given 'mw-redirect' class,
 267                                 // but keeping for back-compatibility with user css.
 268                                 $link = '<span class="redirect-in-category">' . $link . '</span>';
 269                         }
 270                         $this->imgsNoGallery[] = $link;
 271
 272                         $this->imgsNoGallery_start_char[] = $wgContLang->convert(
 273                                 $this->collation->getFirstLetter( $sortkey ) );
 274                 }
 275         }
 276
 277         /**
 278          * Add a miscellaneous page
 279          */
 280         function addPage( $title, $sortkey, $pageLength, $isRedirect = false ) {
 281                 global $wgContLang;
 282
 283                 $link = Linker::link( $title );
 284                 if ( $isRedirect ) {
 285                         // This seems kind of pointless given 'mw-redirect' class,
 286                         // but keeping for back-compatiability with user css.
 287                         $link = '<span class="redirect-in-category">' . $link . '</span>';
 288                 }
 289                 $this->articles[] = $link;
 290
 291                 $this->articles_start_char[] = $wgContLang->convert(
 292                         $this->collation->getFirstLetter( $sortkey ) );
 293         }
 294
 295         function finaliseCategoryState() {
 296                 if ( $this->flip['subcat'] ) {
 297                         $this->children            = array_reverse( $this->children );
 298                         $this->children_start_char = array_reverse( $this->children_start_char );
 299                 }
 300                 if ( $this->flip['page'] ) {
 301                         $this->articles            = array_reverse( $this->articles );
 302                         $this->articles_start_char = array_reverse( $this->articles_start_char );
 303                 }
 304                 if ( !$this->showGallery && $this->flip['file'] ) {
 305                         $this->imgsNoGallery            = array_reverse( $this->imgsNoGallery );
 306                         $this->imgsNoGallery_start_char = array_reverse( $this->imgsNoGallery_start_char );
 307                 }
 308         }
 309
 310         function doCategoryQuery() {
 311                 $dbr = wfGetDB( DB_SLAVE, 'category' );
 312
 313                 $this->nextPage = array(
 314                         'page' => null,
 315                         'subcat' => null,
 316                         'file' => null,
 317                 );
 318                 $this->flip = array( 'page' => false, 'subcat' => false, 'file' => false );
 319
 320                 foreach ( array( 'page', 'subcat', 'file' ) as $type ) {
 321                         # Get the sortkeys for start/end, if applicable.  Note that if
 322                         # the collation in the database differs from the one
 323                         # set in $wgCategoryCollation, pagination might go totally haywire.
 324                         $extraConds = array( 'cl_type' => $type );
 325                         if ( $this->from[$type] !== null ) {
 326                                 $extraConds[] = 'cl_sortkey >= '
 327                                         . $dbr->addQuotes( $this->collation->getSortKey( $this->from[$type] ) );
 328                         } elseif ( $this->until[$type] !== null ) {
 329                                 $extraConds[] = 'cl_sortkey < '
 330                                         . $dbr->addQuotes( $this->collation->getSortKey( $this->until[$type] ) );
 331                                 $this->flip[$type] = true;
 332                         }
 333
 334                         $res = $dbr->select(
 335                                 array( 'page', 'categorylinks', 'category' ),
 336                                 array( 'page_id', 'page_title', 'page_namespace', 'page_len',
 337                                         'page_is_redirect', 'cl_sortkey', 'cat_id', 'cat_title',
 338                                         'cat_subcats', 'cat_pages', 'cat_files',
 339                                         'cl_sortkey_prefix', 'cl_collation' ),
 340                                 array_merge( array( 'cl_to' => $this->title->getDBkey() ),  $extraConds ),
 341                                 __METHOD__,
 342                                 array(
 343                                         'USE INDEX' => array( 'categorylinks' => 'cl_sortkey' ),
 344                                         'LIMIT' => $this->limit + 1,
 345                                         'ORDER BY' => $this->flip[$type] ? 'cl_sortkey DESC' : 'cl_sortkey',
 346                                 ),
 347                                 array(
 348                                         'categorylinks'  => array( 'INNER JOIN', 'cl_from = page_id' ),
 349                                         'category' => array( 'LEFT JOIN', 'cat_title = page_title AND page_namespace = ' . NS_CATEGORY )
 350                                 )
 351                         );
 352
 353                         $count = 0;
 354                         foreach ( $res as $row ) {
 355                                 $title = Title::newFromRow( $row );
 356                                 if ( $row->cl_collation === '' ) {
 357                                         // Hack to make sure that while updating from 1.16 schema
 358                                         // and db is inconsistent, that the sky doesn't fall.
 359                                         // See r83544. Could perhaps be removed in a couple decades...
 360                                         $humanSortkey = $row->cl_sortkey;
 361                                 } else {
 362                                         $humanSortkey = $title->getCategorySortkey( $row->cl_sortkey_prefix );
 363                                 }
 364
 365                                 if ( ++$count > $this->limit ) {
 366                                         # We've reached the one extra which shows that there
 367                                         # are additional pages to be had. Stop here...
 368                                         $this->nextPage[$type] = $humanSortkey;
 369                                         break;
 370                                 }
 371
 372                                 if ( $title->getNamespace() == NS_CATEGORY ) {
 373                                         $cat = Category::newFromRow( $row, $title );
 374                                         $this->addSubcategoryObject( $cat, $humanSortkey, $row->page_len );
 375                                 } elseif ( $title->getNamespace() == NS_FILE ) {
 376                                         $this->addImage( $title, $humanSortkey, $row->page_len, $row->page_is_redirect );
 377                                 } else {
 378                                         $this->addPage( $title, $humanSortkey, $row->page_len, $row->page_is_redirect );
 379                                 }
 380                         }
 381                 }
 382         }
 383
 384         function getCategoryTop() {
 385                 $r = $this->getCategoryBottom();
 386                 return $r === ''
 387                         ? $r
 388                         : "<br style=\"clear:both;\"/>\n" . $r;
 389         }
 390
 391         function getSubcategorySection() {
 392                 # Don't show subcategories section if there are none.
 393                 $r = '';
 394                 $rescnt = count( $this->children );
 395                 $dbcnt = $this->cat->getSubcatCount();
 396                 $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'subcat' );
 397
 398                 if ( $rescnt > 0 ) {
 399                         # Showing subcategories
 400                         $r .= "<div id=\"mw-subcategories\">\n";
 401                         $r .= '<h2>' . wfMsg( 'subcategories' ) . "</h2>\n";
 402                         $r .= $countmsg;
 403                         $r .= $this->getSectionPagingLinks( 'subcat' );
 404                         $r .= $this->formatList( $this->children, $this->children_start_char );
 405                         $r .= $this->getSectionPagingLinks( 'subcat' );
 406                         $r .= "\n</div>";
 407                 }
 408                 return $r;
 409         }
 410
 411         function getPagesSection() {
 412                 $ti = htmlspecialchars( $this->title->getText() );
 413                 # Don't show articles section if there are none.
 414                 $r = '';
 415
 416                 # @todo FIXME: Here and in the other two sections: we don't need to bother
 417                 # with this rigamarole if the entire category contents fit on one page
 418                 # and have already been retrieved.  We can just use $rescnt in that
 419                 # case and save a query and some logic.
 420                 $dbcnt = $this->cat->getPageCount() - $this->cat->getSubcatCount()
 421                         - $this->cat->getFileCount();
 422                 $rescnt = count( $this->articles );
 423                 $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'article' );
 424
 425                 if ( $rescnt > 0 ) {
 426                         $r = "<div id=\"mw-pages\">\n";
 427                         $r .= '<h2>' . wfMsg( 'category_header', $ti ) . "</h2>\n";
 428                         $r .= $countmsg;
 429                         $r .= $this->getSectionPagingLinks( 'page' );
 430                         $r .= $this->formatList( $this->articles, $this->articles_start_char );
 431                         $r .= $this->getSectionPagingLinks( 'page' );
 432                         $r .= "\n</div>";
 433                 }
 434                 return $r;
 435         }
 436
 437         function getImageSection() {
 438                 $r = '';
 439                 $rescnt = $this->showGallery ? $this->gallery->count() : count( $this->imgsNoGallery );
 440                 if ( $rescnt > 0 ) {
 441                         $dbcnt = $this->cat->getFileCount();
 442                         $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'file' );
 443
 444                         $r .= "<div id=\"mw-category-media\">\n";
 445                         $r .= '<h2>' . wfMsg( 'category-media-header', htmlspecialchars( $this->title->getText() ) ) . "</h2>\n";
 446                         $r .= $countmsg;
 447                         $r .= $this->getSectionPagingLinks( 'file' );
 448                         if ( $this->showGallery ) {
 449                                 $r .= $this->gallery->toHTML();
 450                         } else {
 451                                 $r .= $this->formatList( $this->imgsNoGallery, $this->imgsNoGallery_start_char );
 452                         }
 453                         $r .= $this->getSectionPagingLinks( 'file' );
 454                         $r .= "\n</div>";
 455                 }
 456                 return $r;
 457         }
 458
 459         /**
 460          * Get the paging links for a section (subcats/pages/files), to go at the top and bottom
 461          * of the output.
 462          *
 463          * @param $type String: 'page', 'subcat', or 'file'
 464          * @return String: HTML output, possibly empty if there are no other pages
 465          */
 466         private function getSectionPagingLinks( $type ) {
 467                 if ( $this->until[$type] !== null ) {
 468                         return $this->pagingLinks( $this->nextPage[$type], $this->until[$type], $type );
 469                 } elseif ( $this->nextPage[$type] !== null || $this->from[$type] !== null ) {
 470                         return $this->pagingLinks( $this->from[$type], $this->nextPage[$type], $type );
 471                 } else {
 472                         return '';
 473                 }
 474         }
 475
 476         function getCategoryBottom() {
 477                 return '';
 478         }
 479
 480         /**
 481          * Format a list of articles chunked by letter, either as a
 482          * bullet list or a columnar format, depending on the length.
 483          *
 484          * @param $articles Array
 485          * @param $articles_start_char Array
 486          * @param $cutoff Int
 487          * @return String
 488          * @private
 489          */
 490         function formatList( $articles, $articles_start_char, $cutoff = 6 ) {
 491                 $list = '';
 492                 if ( count ( $articles ) > $cutoff ) {
 493                         $list = self::columnList( $articles, $articles_start_char );
 494                 } elseif ( count( $articles ) > 0 ) {
 495                         // for short lists of articles in categories.
 496                         $list = self::shortList( $articles, $articles_start_char );
 497                 }
 498
 499                 $pageLang = $this->title->getPageLanguage();
 500                 $attribs = array( 'lang' => $pageLang->getCode(), 'dir' => $pageLang->getDir(),
 501                         'class' => 'mw-content-'.$pageLang->getDir() );
 502                 $list = Html::rawElement( 'div', $attribs, $list );
 503
 504                 return $list;
 505         }
 506
 507         /**
 508          * Format a list of articles chunked by letter in a three-column
 509          * list, ordered vertically.
 510          *
 511          * TODO: Take the headers into account when creating columns, so they're
 512          * more visually equal.
 513          *
 514          * More distant TODO: Scrap this and use CSS columns, whenever IE finally
 515          * supports those.
 516          *
 517          * @param $articles Array
 518          * @param $articles_start_char Array
 519          * @return String
 520          * @private
 521          */
 522         static function columnList( $articles, $articles_start_char ) {
 523                 $columns = array_combine( $articles, $articles_start_char );
 524                 # Split into three columns
 525                 $columns = array_chunk( $columns, ceil( count( $columns ) / 3 ), true /* preserve keys */ );
 526
 527                 $ret = '<table width="100%"><tr valign="top"><td>';
 528                 $prevchar = null;
 529
 530                 foreach ( $columns as $column ) {
 531                         $colContents = array();
 532
 533                         # Kind of like array_flip() here, but we keep duplicates in an
 534                         # array instead of dropping them.
 535                         foreach ( $column as $article => $char ) {
 536                                 if ( !isset( $colContents[$char] ) ) {
 537                                         $colContents[$char] = array();
 538                                 }
 539                                 $colContents[$char][] = $article;
 540                         }
 541
 542                         $first = true;
 543                         foreach ( $colContents as $char => $articles ) {
 544                                 $ret .= '<h3>' . htmlspecialchars( $char );
 545                                 if ( $first && $char === $prevchar ) {
 546                                         # We're continuing a previous chunk at the top of a new
 547                                         # column, so add " cont." after the letter.
 548                                         $ret .= ' ' . wfMsgHtml( 'listingcontinuesabbrev' );
 549                                 }
 550                                 $ret .= "</h3>\n";
 551
 552                                 $ret .= '<ul><li>';
 553                                 $ret .= implode( "</li>\n<li>", $articles );
 554                                 $ret .= '</li></ul>';
 555
 556                                 $first = false;
 557                                 $prevchar = $char;
 558                         }
 559
 560                         $ret .= "</td>\n<td>";
 561                 }
 562
 563                 $ret .= '</td></tr></table>';
 564                 return $ret;
 565         }
 566
 567         /**
 568          * Format a list of articles chunked by letter in a bullet list.
 569          * @param $articles Array
 570          * @param $articles_start_char Array
 571          * @return String
 572          * @private
 573          */
 574         static function shortList( $articles, $articles_start_char ) {
 575                 $r = '<h3>' . htmlspecialchars( $articles_start_char[0] ) . "</h3>\n";
 576                 $r .= '<ul><li>' . $articles[0] . '</li>';
 577                 for ( $index = 1; $index < count( $articles ); $index++ ) {
 578                         if ( $articles_start_char[$index] != $articles_start_char[$index - 1] ) {
 579                                 $r .= "</ul><h3>" . htmlspecialchars( $articles_start_char[$index] ) . "</h3>\n<ul>";
 580                         }
 581
 582                         $r .= "<li>{$articles[$index]}</li>";
 583                 }
 584                 $r .= '</ul>';
 585                 return $r;
 586         }
 587
 588         /**
 589          * Create paging links, as a helper method to getSectionPagingLinks().
 590          *
 591          * @param $first String The 'until' parameter for the generated URL
 592          * @param $last String The 'from' parameter for the genererated URL
 593          * @param $type String A prefix for parameters, 'page' or 'subcat' or
 594          *     'file'
 595          * @return String HTML
 596          */
 597         private function pagingLinks( $first, $last, $type = '' ) {
 598                 global $wgLang;
 599
 600                 $limitText = $wgLang->formatNum( $this->limit );
 601
 602                 $prevLink = wfMsgExt( 'prevn', array( 'escape', 'parsemag' ), $limitText );
 603
 604                 if ( $first != '' ) {
 605                         $prevQuery = $this->query;
 606                         $prevQuery["{$type}until"] = $first;
 607                         unset( $prevQuery["{$type}from"] );
 608                         $prevLink = Linker::linkKnown(
 609                                 $this->addFragmentToTitle( $this->title, $type ),
 610                                 $prevLink,
 611                                 array(),
 612                                 $prevQuery
 613                         );
 614                 }
 615
 616                 $nextLink = wfMsgExt( 'nextn', array( 'escape', 'parsemag' ), $limitText );
 617
 618                 if ( $last != '' ) {
 619                         $lastQuery = $this->query;
 620                         $lastQuery["{$type}from"] = $last;
 621                         unset( $lastQuery["{$type}until"] );
 622                         $nextLink = Linker::linkKnown(
 623                                 $this->addFragmentToTitle( $this->title, $type ),
 624                                 $nextLink,
 625                                 array(),
 626                                 $lastQuery
 627                         );
 628                 }
 629
 630                 return "($prevLink) ($nextLink)";
 631         }
 632
 633         /**
 634          * Takes a title, and adds the fragment identifier that
 635          * corresponds to the correct segment of the category.
 636          *
 637          * @param Title $title: The title (usually $this->title)
 638          * @param String $section: Which section
 639          */
 640         private function addFragmentToTitle( $title, $section ) {
 641                 switch ( $section ) {
 642                         case 'page':
 643                                 $fragment = 'mw-pages';
 644                                 break;
 645                         case 'subcat':
 646                                 $fragment = 'mw-subcategories';
 647                                 break;
 648                         case 'file':
 649                                 $fragment = 'mw-category-media';
 650                                 break;
 651                         default:
 652                                 throw new MWException( __METHOD__ .
 653                                         " Invalid section $section." );
 654                 }
 655
 656                 return Title::makeTitle( $title->getNamespace(),
 657                         $title->getDBkey(), $fragment );
 658         }
 659         /**
 660          * What to do if the category table conflicts with the number of results
 661          * returned?  This function says what. Each type is considered independently
 662          * of the other types.
 663          *
 664          * Note for grepping: uses the messages category-article-count,
 665          * category-article-count-limited, category-subcat-count,
 666          * category-subcat-count-limited, category-file-count,
 667          * category-file-count-limited.
 668          *
 669          * @param $rescnt Int: The number of items returned by our database query.
 670          * @param $dbcnt Int: The number of items according to the category table.
 671          * @param $type String: 'subcat', 'article', or 'file'
 672          * @return String: A message giving the number of items, to output to HTML.
 673          */
 674         private function getCountMessage( $rescnt, $dbcnt, $type ) {
 675                 global $wgLang;
 676                 # There are three cases:
 677                 #   1) The category table figure seems sane.  It might be wrong, but
 678                 #      we can't do anything about it if we don't recalculate it on ev-
 679                 #      ery category view.
 680                 #   2) The category table figure isn't sane, like it's smaller than the
 681                 #      number of actual results, *but* the number of results is less
 682                 #      than $this->limit and there's no offset.  In this case we still
 683                 #      know the right figure.
 684                 #   3) We have no idea.
 685
 686                 # Check if there's a "from" or "until" for anything
 687
 688                 // This is a little ugly, but we seem to use different names
 689                 // for the paging types then for the messages.
 690                 if ( $type === 'article' ) {
 691                         $pagingType = 'page';
 692                 } else {
 693                         $pagingType = $type;
 694                 }
 695
 696                 $fromOrUntil = false;
 697                 if ( $this->from[$pagingType] !== null || $this->until[$pagingType] !== null ) {
 698                         $fromOrUntil = true;
 699                 }
 700
 701                 if ( $dbcnt == $rescnt || ( ( $rescnt == $this->limit || $fromOrUntil )
 702                         && $dbcnt > $rescnt ) ) {
 703                         # Case 1: seems sane.
 704                         $totalcnt = $dbcnt;
 705                 } elseif ( $rescnt < $this->limit && !$fromOrUntil ) {
 706                         # Case 2: not sane, but salvageable.  Use the number of results.
 707                         # Since there are fewer than 200, we can also take this opportunity
 708                         # to refresh the incorrect category table entry -- which should be
 709                         # quick due to the small number of entries.
 710                         $totalcnt = $rescnt;
 711                         $this->cat->refreshCounts();
 712                 } else {
 713                         # Case 3: hopeless.  Don't give a total count at all.
 714                         return wfMsgExt( "category-$type-count-limited", 'parse',
 715                                 $wgLang->formatNum( $rescnt ) );
 716                 }
 717                 return wfMsgExt(
 718                         "category-$type-count",
 719                         'parse',
 720                         $wgLang->formatNum( $rescnt ),
 721                         $wgLang->formatNum( $totalcnt )
 722                 );
 723         }
 724 }