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, $wgContLang;
 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                 $pageLang = $this->title->getPageLanguage();
 178                 $langAttribs = array( 'lang' => $pageLang->getCode(), 'dir' => $pageLang->getDir() );
 179                 # close the previous div, show the headings in user language,
 180                 # then open a new div with the page content language again
 181                 $r = '</div>' . $r . Html::openElement( 'div', $langAttribs );
 182
 183                 wfProfileOut( __METHOD__ );
 184                 return $wgContLang->convert( $r );
 185         }
 186
 187         function clearCategoryState() {
 188                 $this->articles = array();
 189                 $this->articles_start_char = array();
 190                 $this->children = array();
 191                 $this->children_start_char = array();
 192                 if ( $this->showGallery ) {
 193                         $this->gallery = new ImageGallery();
 194                         $this->gallery->setHideBadImages();
 195                 } else {
 196                         $this->imgsNoGallery = array();
 197                         $this->imgsNoGallery_start_char = array();
 198                 }
 199         }
 200
 201         /**
 202          * Add a subcategory to the internal lists, using a Category object
 203          */
 204         function addSubcategoryObject( Category $cat, $sortkey, $pageLength ) {
 205                 // Subcategory; strip the 'Category' namespace from the link text.
 206                 $title = $cat->getTitle();
 207
 208                 $link = Linker::link( $title, htmlspecialchars( $title->getText() ) );
 209                 if ( $title->isRedirect() ) {
 210                         // This didn't used to add redirect-in-category, but might
 211                         // as well be consistent with the rest of the sections
 212                         // on a category page.
 213                         $link = '<span class="redirect-in-category">' . $link . '</span>';
 214                 }
 215                 $this->children[] = $link;
 216
 217                 $this->children_start_char[] =
 218                         $this->getSubcategorySortChar( $cat->getTitle(), $sortkey );
 219         }
 220
 221         /**
 222          * Add a subcategory to the internal lists, using a title object
 223          * @deprecated since 1.17 kept for compatibility, please use addSubcategoryObject instead
 224          */
 225         function addSubcategory( Title $title, $sortkey, $pageLength ) {
 226                 $this->addSubcategoryObject( Category::newFromTitle( $title ), $sortkey, $pageLength );
 227         }
 228
 229         /**
 230         * Get the character to be used for sorting subcategories.
 231         * If there's a link from Category:A to Category:B, the sortkey of the resulting
 232         * entry in the categorylinks table is Category:A, not A, which it SHOULD be.
 233         * Workaround: If sortkey == "Category:".$title, than use $title for sorting,
 234         * else use sortkey...
 235         *
 236         * @param Title $title
 237         * @param string $sortkey The human-readable sortkey (before transforming to icu or whatever).
 238         */
 239         function getSubcategorySortChar( $title, $sortkey ) {
 240                 global $wgContLang;
 241
 242                 if ( $title->getPrefixedText() == $sortkey ) {
 243                         $word = $title->getDBkey();
 244                 } else {
 245                         $word = $sortkey;
 246                 }
 247
 248                 $firstChar = $this->collation->getFirstLetter( $word );
 249
 250                 return $wgContLang->convert( $firstChar );
 251         }
 252
 253         /**
 254          * Add a page in the image namespace
 255          */
 256         function addImage( Title $title, $sortkey, $pageLength, $isRedirect = false ) {
 257                 global $wgContLang;
 258                 if ( $this->showGallery ) {
 259                         $flip = $this->flip['file'];
 260                         if ( $flip ) {
 261                                 $this->gallery->insert( $title );
 262                         } else {
 263                                 $this->gallery->add( $title );
 264                         }
 265                 } else {
 266                         $link = Linker::link( $title );
 267                         if ( $isRedirect ) {
 268                                 // This seems kind of pointless given 'mw-redirect' class,
 269                                 // but keeping for back-compatibility with user css.
 270                                 $link = '<span class="redirect-in-category">' . $link . '</span>';
 271                         }
 272                         $this->imgsNoGallery[] = $link;
 273
 274                         $this->imgsNoGallery_start_char[] = $wgContLang->convert(
 275                                 $this->collation->getFirstLetter( $sortkey ) );
 276                 }
 277         }
 278
 279         /**
 280          * Add a miscellaneous page
 281          */
 282         function addPage( $title, $sortkey, $pageLength, $isRedirect = false ) {
 283                 global $wgContLang;
 284
 285                 $link = Linker::link( $title );
 286                 if ( $isRedirect ) {
 287                         // This seems kind of pointless given 'mw-redirect' class,
 288                         // but keeping for back-compatiability with user css.
 289                         $link = '<span class="redirect-in-category">' . $link . '</span>';
 290                 }
 291                 $this->articles[] = $link;
 292
 293                 $this->articles_start_char[] = $wgContLang->convert(
 294                         $this->collation->getFirstLetter( $sortkey ) );
 295         }
 296
 297         function finaliseCategoryState() {
 298                 if ( $this->flip['subcat'] ) {
 299                         $this->children            = array_reverse( $this->children );
 300                         $this->children_start_char = array_reverse( $this->children_start_char );
 301                 }
 302                 if ( $this->flip['page'] ) {
 303                         $this->articles            = array_reverse( $this->articles );
 304                         $this->articles_start_char = array_reverse( $this->articles_start_char );
 305                 }
 306                 if ( !$this->showGallery && $this->flip['file'] ) {
 307                         $this->imgsNoGallery            = array_reverse( $this->imgsNoGallery );
 308                         $this->imgsNoGallery_start_char = array_reverse( $this->imgsNoGallery_start_char );
 309                 }
 310         }
 311
 312         function doCategoryQuery() {
 313                 $dbr = wfGetDB( DB_SLAVE, 'category' );
 314
 315                 $this->nextPage = array(
 316                         'page' => null,
 317                         'subcat' => null,
 318                         'file' => null,
 319                 );
 320                 $this->flip = array( 'page' => false, 'subcat' => false, 'file' => false );
 321
 322                 foreach ( array( 'page', 'subcat', 'file' ) as $type ) {
 323                         # Get the sortkeys for start/end, if applicable.  Note that if
 324                         # the collation in the database differs from the one
 325                         # set in $wgCategoryCollation, pagination might go totally haywire.
 326                         $extraConds = array( 'cl_type' => $type );
 327                         if ( $this->from[$type] !== null ) {
 328                                 $extraConds[] = 'cl_sortkey >= '
 329                                         . $dbr->addQuotes( $this->collation->getSortKey( $this->from[$type] ) );
 330                         } elseif ( $this->until[$type] !== null ) {
 331                                 $extraConds[] = 'cl_sortkey < '
 332                                         . $dbr->addQuotes( $this->collation->getSortKey( $this->until[$type] ) );
 333                                 $this->flip[$type] = true;
 334                         }
 335
 336                         $res = $dbr->select(
 337                                 array( 'page', 'categorylinks', 'category' ),
 338                                 array( 'page_id', 'page_title', 'page_namespace', 'page_len',
 339                                         'page_is_redirect', 'cl_sortkey', 'cat_id', 'cat_title',
 340                                         'cat_subcats', 'cat_pages', 'cat_files',
 341                                         'cl_sortkey_prefix', 'cl_collation' ),
 342                                 array_merge( array( 'cl_to' => $this->title->getDBkey() ),  $extraConds ),
 343                                 __METHOD__,
 344                                 array(
 345                                         'USE INDEX' => array( 'categorylinks' => 'cl_sortkey' ),
 346                                         'LIMIT' => $this->limit + 1,
 347                                         'ORDER BY' => $this->flip[$type] ? 'cl_sortkey DESC' : 'cl_sortkey',
 348                                 ),
 349                                 array(
 350                                         'categorylinks'  => array( 'INNER JOIN', 'cl_from = page_id' ),
 351                                         'category' => array( 'LEFT JOIN', 'cat_title = page_title AND page_namespace = ' . NS_CATEGORY )
 352                                 )
 353                         );
 354
 355                         $count = 0;
 356                         foreach ( $res as $row ) {
 357                                 $title = Title::newFromRow( $row );
 358                                 if ( $row->cl_collation === '' ) {
 359                                         // Hack to make sure that while updating from 1.16 schema
 360                                         // and db is inconsistent, that the sky doesn't fall.
 361                                         // See r83544. Could perhaps be removed in a couple decades...
 362                                         $humanSortkey = $row->cl_sortkey;
 363                                 } else {
 364                                         $humanSortkey = $title->getCategorySortkey( $row->cl_sortkey_prefix );
 365                                 }
 366
 367                                 if ( ++$count > $this->limit ) {
 368                                         # We've reached the one extra which shows that there
 369                                         # are additional pages to be had. Stop here...
 370                                         $this->nextPage[$type] = $humanSortkey;
 371                                         break;
 372                                 }
 373
 374                                 if ( $title->getNamespace() == NS_CATEGORY ) {
 375                                         $cat = Category::newFromRow( $row, $title );
 376                                         $this->addSubcategoryObject( $cat, $humanSortkey, $row->page_len );
 377                                 } elseif ( $title->getNamespace() == NS_FILE ) {
 378                                         $this->addImage( $title, $humanSortkey, $row->page_len, $row->page_is_redirect );
 379                                 } else {
 380                                         $this->addPage( $title, $humanSortkey, $row->page_len, $row->page_is_redirect );
 381                                 }
 382                         }
 383                 }
 384         }
 385
 386         function getCategoryTop() {
 387                 $r = $this->getCategoryBottom();
 388                 return $r === ''
 389                         ? $r
 390                         : "<br style=\"clear:both;\"/>\n" . $r;
 391         }
 392
 393         function getSubcategorySection() {
 394                 # Don't show subcategories section if there are none.
 395                 $r = '';
 396                 $rescnt = count( $this->children );
 397                 $dbcnt = $this->cat->getSubcatCount();
 398                 $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'subcat' );
 399
 400                 if ( $rescnt > 0 ) {
 401                         # Showing subcategories
 402                         $r .= "<div id=\"mw-subcategories\">\n";
 403                         $r .= '<h2>' . wfMsg( 'subcategories' ) . "</h2>\n";
 404                         $r .= $countmsg;
 405                         $r .= $this->getSectionPagingLinks( 'subcat' );
 406                         $r .= $this->formatList( $this->children, $this->children_start_char );
 407                         $r .= $this->getSectionPagingLinks( 'subcat' );
 408                         $r .= "\n</div>";
 409                 }
 410                 return $r;
 411         }
 412
 413         function getPagesSection() {
 414                 $ti = htmlspecialchars( $this->title->getText() );
 415                 # Don't show articles section if there are none.
 416                 $r = '';
 417
 418                 # @todo FIXME: Here and in the other two sections: we don't need to bother
 419                 # with this rigamarole if the entire category contents fit on one page
 420                 # and have already been retrieved.  We can just use $rescnt in that
 421                 # case and save a query and some logic.
 422                 $dbcnt = $this->cat->getPageCount() - $this->cat->getSubcatCount()
 423                         - $this->cat->getFileCount();
 424                 $rescnt = count( $this->articles );
 425                 $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'article' );
 426
 427                 if ( $rescnt > 0 ) {
 428                         $r = "<div id=\"mw-pages\">\n";
 429                         $r .= '<h2>' . wfMsg( 'category_header', $ti ) . "</h2>\n";
 430                         $r .= $countmsg;
 431                         $r .= $this->getSectionPagingLinks( 'page' );
 432                         $r .= $this->formatList( $this->articles, $this->articles_start_char );
 433                         $r .= $this->getSectionPagingLinks( 'page' );
 434                         $r .= "\n</div>";
 435                 }
 436                 return $r;
 437         }
 438
 439         function getImageSection() {
 440                 $r = '';
 441                 $rescnt = $this->showGallery ? $this->gallery->count() : count( $this->imgsNoGallery );
 442                 if ( $rescnt > 0 ) {
 443                         $dbcnt = $this->cat->getFileCount();
 444                         $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'file' );
 445
 446                         $r .= "<div id=\"mw-category-media\">\n";
 447                         $r .= '<h2>' . wfMsg( 'category-media-header', htmlspecialchars( $this->title->getText() ) ) . "</h2>\n";
 448                         $r .= $countmsg;
 449                         $r .= $this->getSectionPagingLinks( 'file' );
 450                         if ( $this->showGallery ) {
 451                                 $r .= $this->gallery->toHTML();
 452                         } else {
 453                                 $r .= $this->formatList( $this->imgsNoGallery, $this->imgsNoGallery_start_char );
 454                         }
 455                         $r .= $this->getSectionPagingLinks( 'file' );
 456                         $r .= "\n</div>";
 457                 }
 458                 return $r;
 459         }
 460
 461         /**
 462          * Get the paging links for a section (subcats/pages/files), to go at the top and bottom
 463          * of the output.
 464          *
 465          * @param $type String: 'page', 'subcat', or 'file'
 466          * @return String: HTML output, possibly empty if there are no other pages
 467          */
 468         private function getSectionPagingLinks( $type ) {
 469                 if ( $this->until[$type] !== null ) {
 470                         return $this->pagingLinks( $this->nextPage[$type], $this->until[$type], $type );
 471                 } elseif ( $this->nextPage[$type] !== null || $this->from[$type] !== null ) {
 472                         return $this->pagingLinks( $this->from[$type], $this->nextPage[$type], $type );
 473                 } else {
 474                         return '';
 475                 }
 476         }
 477
 478         function getCategoryBottom() {
 479                 return '';
 480         }
 481
 482         /**
 483          * Format a list of articles chunked by letter, either as a
 484          * bullet list or a columnar format, depending on the length.
 485          *
 486          * @param $articles Array
 487          * @param $articles_start_char Array
 488          * @param $cutoff Int
 489          * @return String
 490          * @private
 491          */
 492         function formatList( $articles, $articles_start_char, $cutoff = 6 ) {
 493                 $list = '';
 494                 if ( count ( $articles ) > $cutoff ) {
 495                         $list = self::columnList( $articles, $articles_start_char );
 496                 } elseif ( count( $articles ) > 0 ) {
 497                         // for short lists of articles in categories.
 498                         $list = self::shortList( $articles, $articles_start_char );
 499                 }
 500
 501                 $pageLang = $this->title->getPageLanguage();
 502                 $attribs = array( 'lang' => $pageLang->getCode(), 'dir' => $pageLang->getDir(),
 503                         'class' => 'mw-content-'.$pageLang->getDir() );
 504                 $list = Html::rawElement( 'div', $attribs, $list );
 505
 506                 return $list;
 507         }
 508
 509         /**
 510          * Format a list of articles chunked by letter in a three-column
 511          * list, ordered vertically.
 512          *
 513          * TODO: Take the headers into account when creating columns, so they're
 514          * more visually equal.
 515          *
 516          * More distant TODO: Scrap this and use CSS columns, whenever IE finally
 517          * supports those.
 518          *
 519          * @param $articles Array
 520          * @param $articles_start_char Array
 521          * @return String
 522          * @private
 523          */
 524         static function columnList( $articles, $articles_start_char ) {
 525                 $columns = array_combine( $articles, $articles_start_char );
 526                 # Split into three columns
 527                 $columns = array_chunk( $columns, ceil( count( $columns ) / 3 ), true /* preserve keys */ );
 528
 529                 $ret = '<table width="100%"><tr valign="top"><td>';
 530                 $prevchar = null;
 531
 532                 foreach ( $columns as $column ) {
 533                         $colContents = array();
 534
 535                         # Kind of like array_flip() here, but we keep duplicates in an
 536                         # array instead of dropping them.
 537                         foreach ( $column as $article => $char ) {
 538                                 if ( !isset( $colContents[$char] ) ) {
 539                                         $colContents[$char] = array();
 540                                 }
 541                                 $colContents[$char][] = $article;
 542                         }
 543
 544                         $first = true;
 545                         foreach ( $colContents as $char => $articles ) {
 546                                 $ret .= '<h3>' . htmlspecialchars( $char );
 547                                 if ( $first && $char === $prevchar ) {
 548                                         # We're continuing a previous chunk at the top of a new
 549                                         # column, so add " cont." after the letter.
 550                                         $ret .= ' ' . wfMsgHtml( 'listingcontinuesabbrev' );
 551                                 }
 552                                 $ret .= "</h3>\n";
 553
 554                                 $ret .= '<ul><li>';
 555                                 $ret .= implode( "</li>\n<li>", $articles );
 556                                 $ret .= '</li></ul>';
 557
 558                                 $first = false;
 559                                 $prevchar = $char;
 560                         }
 561
 562                         $ret .= "</td>\n<td>";
 563                 }
 564
 565                 $ret .= '</td></tr></table>';
 566                 return $ret;
 567         }
 568
 569         /**
 570          * Format a list of articles chunked by letter in a bullet list.
 571          * @param $articles Array
 572          * @param $articles_start_char Array
 573          * @return String
 574          * @private
 575          */
 576         static function shortList( $articles, $articles_start_char ) {
 577                 $r = '<h3>' . htmlspecialchars( $articles_start_char[0] ) . "</h3>\n";
 578                 $r .= '<ul><li>' . $articles[0] . '</li>';
 579                 for ( $index = 1; $index < count( $articles ); $index++ ) {
 580                         if ( $articles_start_char[$index] != $articles_start_char[$index - 1] ) {
 581                                 $r .= "</ul><h3>" . htmlspecialchars( $articles_start_char[$index] ) . "</h3>\n<ul>";
 582                         }
 583
 584                         $r .= "<li>{$articles[$index]}</li>";
 585                 }
 586                 $r .= '</ul>';
 587                 return $r;
 588         }
 589
 590         /**
 591          * Create paging links, as a helper method to getSectionPagingLinks().
 592          *
 593          * @param $first String The 'until' parameter for the generated URL
 594          * @param $last String The 'from' parameter for the genererated URL
 595          * @param $type String A prefix for parameters, 'page' or 'subcat' or
 596          *     'file'
 597          * @return String HTML
 598          */
 599         private function pagingLinks( $first, $last, $type = '' ) {
 600                 global $wgLang;
 601
 602                 $limitText = $wgLang->formatNum( $this->limit );
 603
 604                 $prevLink = wfMsgExt( 'prevn', array( 'escape', 'parsemag' ), $limitText );
 605
 606                 if ( $first != '' ) {
 607                         $prevQuery = $this->query;
 608                         $prevQuery["{$type}until"] = $first;
 609                         unset( $prevQuery["{$type}from"] );
 610                         $prevLink = Linker::linkKnown(
 611                                 $this->addFragmentToTitle( $this->title, $type ),
 612                                 $prevLink,
 613                                 array(),
 614                                 $prevQuery
 615                         );
 616                 }
 617
 618                 $nextLink = wfMsgExt( 'nextn', array( 'escape', 'parsemag' ), $limitText );
 619
 620                 if ( $last != '' ) {
 621                         $lastQuery = $this->query;
 622                         $lastQuery["{$type}from"] = $last;
 623                         unset( $lastQuery["{$type}until"] );
 624                         $nextLink = Linker::linkKnown(
 625                                 $this->addFragmentToTitle( $this->title, $type ),
 626                                 $nextLink,
 627                                 array(),
 628                                 $lastQuery
 629                         );
 630                 }
 631
 632                 return "($prevLink) ($nextLink)";
 633         }
 634
 635         /**
 636          * Takes a title, and adds the fragment identifier that
 637          * corresponds to the correct segment of the category.
 638          *
 639          * @param Title $title: The title (usually $this->title)
 640          * @param String $section: Which section
 641          */
 642         private function addFragmentToTitle( $title, $section ) {
 643                 switch ( $section ) {
 644                         case 'page':
 645                                 $fragment = 'mw-pages';
 646                                 break;
 647                         case 'subcat':
 648                                 $fragment = 'mw-subcategories';
 649                                 break;
 650                         case 'file':
 651                                 $fragment = 'mw-category-media';
 652                                 break;
 653                         default:
 654                                 throw new MWException( __METHOD__ .
 655                                         " Invalid section $section." );
 656                 }
 657
 658                 return Title::makeTitle( $title->getNamespace(),
 659                         $title->getDBkey(), $fragment );
 660         }
 661         /**
 662          * What to do if the category table conflicts with the number of results
 663          * returned?  This function says what. Each type is considered independently
 664          * of the other types.
 665          *
 666          * Note for grepping: uses the messages category-article-count,
 667          * category-article-count-limited, category-subcat-count,
 668          * category-subcat-count-limited, category-file-count,
 669          * category-file-count-limited.
 670          *
 671          * @param $rescnt Int: The number of items returned by our database query.
 672          * @param $dbcnt Int: The number of items according to the category table.
 673          * @param $type String: 'subcat', 'article', or 'file'
 674          * @return String: A message giving the number of items, to output to HTML.
 675          */
 676         private function getCountMessage( $rescnt, $dbcnt, $type ) {
 677                 global $wgLang;
 678                 # There are three cases:
 679                 #   1) The category table figure seems sane.  It might be wrong, but
 680                 #      we can't do anything about it if we don't recalculate it on ev-
 681                 #      ery category view.
 682                 #   2) The category table figure isn't sane, like it's smaller than the
 683                 #      number of actual results, *but* the number of results is less
 684                 #      than $this->limit and there's no offset.  In this case we still
 685                 #      know the right figure.
 686                 #   3) We have no idea.
 687
 688                 # Check if there's a "from" or "until" for anything
 689
 690                 // This is a little ugly, but we seem to use different names
 691                 // for the paging types then for the messages.
 692                 if ( $type === 'article' ) {
 693                         $pagingType = 'page';
 694                 } else {
 695                         $pagingType = $type;
 696                 }
 697
 698                 $fromOrUntil = false;
 699                 if ( $this->from[$pagingType] !== null || $this->until[$pagingType] !== null ) {
 700                         $fromOrUntil = true;
 701                 }
 702
 703                 if ( $dbcnt == $rescnt || ( ( $rescnt == $this->limit || $fromOrUntil )
 704                         && $dbcnt > $rescnt ) ) {
 705                         # Case 1: seems sane.
 706                         $totalcnt = $dbcnt;
 707                 } elseif ( $rescnt < $this->limit && !$fromOrUntil ) {
 708                         # Case 2: not sane, but salvageable.  Use the number of results.
 709                         # Since there are fewer than 200, we can also take this opportunity
 710                         # to refresh the incorrect category table entry -- which should be
 711                         # quick due to the small number of entries.
 712                         $totalcnt = $rescnt;
 713                         $this->cat->refreshCounts();
 714                 } else {
 715                         # Case 3: hopeless.  Don't give a total count at all.
 716                         return wfMsgExt( "category-$type-count-limited", 'parse',
 717                                 $wgLang->formatNum( $rescnt ) );
 718                 }
 719                 return wfMsgExt(
 720                         "category-$type-count",
 721                         'parse',
 722                         $wgLang->formatNum( $rescnt ),
 723                         $wgLang->formatNum( $totalcnt )
 724                 );
 725         }
 726 }