includes/CategoryViewer.php

   1 <?php
   2 /**
   3  * List and paging of category members.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 class CategoryViewer extends ContextSource {
  24         var $limit, $from, $until,
  25                 $articles, $articles_start_char,
  26                 $children, $children_start_char,
  27                 $showGallery, $imgsNoGalley,
  28                 $imgsNoGallery_start_char,
  29                 $imgsNoGallery;
  30
  31         /**
  32          * @var array
  33          */
  34         var $nextPage;
  35
  36         /**
  37          * @var array
  38          */
  39         var $flip;
  40
  41         /**
  42          * @var Title
  43          */
  44         var $title;
  45
  46         /**
  47          * @var Collation
  48          */
  49         var $collation;
  50
  51         /**
  52          * @var ImageGallery
  53          */
  54         var $gallery;
  55
  56         /**
  57          * Category object for this page
  58          * @var Category
  59          */
  60         private $cat;
  61
  62         /**
  63          * The original query array, to be used in generating paging links.
  64          * @var array
  65          */
  66         private $query;
  67
  68         /**
  69          * Constructor
  70          *
  71          * @since 1.19 $context is a second, required parameter
  72          * @param Title $title
  73          * @param IContextSource $context
  74          * @param array $from An array with keys page, subcat,
  75          *        and file for offset of results of each section (since 1.17)
  76          * @param array $until An array with 3 keys for until of each section (since 1.17)
  77          * @param array $query
  78          */
  79         function __construct( $title, IContextSource $context, $from = array(),
  80                 $until = array(), $query = array()
  81         ) {
  82                 global $wgCategoryPagingLimit;
  83                 $this->title = $title;
  84                 $this->setContext( $context );
  85                 $this->from = $from;
  86                 $this->until = $until;
  87                 $this->limit = $wgCategoryPagingLimit;
  88                 $this->cat = Category::newFromTitle( $title );
  89                 $this->query = $query;
  90                 $this->collation = Collation::singleton();
  91                 unset( $this->query['title'] );
  92         }
  93
  94         /**
  95          * Format the category data list.
  96          *
  97          * @return string HTML output
  98          */
  99         public function getHTML() {
 100                 global $wgCategoryMagicGallery;
 101                 wfProfileIn( __METHOD__ );
 102
 103                 $this->showGallery = $wgCategoryMagicGallery && !$this->getOutput()->mNoGallery;
 104
 105                 $this->clearCategoryState();
 106                 $this->doCategoryQuery();
 107                 $this->finaliseCategoryState();
 108
 109                 $r = $this->getSubcategorySection() .
 110                         $this->getPagesSection() .
 111                         $this->getImageSection();
 112
 113                 if ( $r == '' ) {
 114                         // If there is no category content to display, only
 115                         // show the top part of the navigation links.
 116                         // @todo FIXME: Cannot be completely suppressed because it
 117                         //        is unknown if 'until' or 'from' makes this
 118                         //        give 0 results.
 119                         $r = $r . $this->getCategoryTop();
 120                 } else {
 121                         $r = $this->getCategoryTop() .
 122                                 $r .
 123                                 $this->getCategoryBottom();
 124                 }
 125
 126                 // Give a proper message if category is empty
 127                 if ( $r == '' ) {
 128                         $r = $this->msg( 'category-empty' )->parseAsBlock();
 129                 }
 130
 131                 $lang = $this->getLanguage();
 132                 $langAttribs = array( 'lang' => $lang->getCode(), 'dir' => $lang->getDir() );
 133                 # put a div around the headings which are in the user language
 134                 $r = Html::openElement( 'div', $langAttribs ) . $r . '</div>';
 135
 136                 wfProfileOut( __METHOD__ );
 137                 return $r;
 138         }
 139
 140         function clearCategoryState() {
 141                 $this->articles = array();
 142                 $this->articles_start_char = array();
 143                 $this->children = array();
 144                 $this->children_start_char = array();
 145                 if ( $this->showGallery ) {
 146                         // Note that null for mode is taken to mean use default.
 147                         $mode = $this->getRequest()->getVal( 'gallerymode', null );
 148                         try {
 149                                 $this->gallery = ImageGalleryBase::factory( $mode );
 150                         } catch ( MWException $e ) {
 151                                 // User specified something invalid, fallback to default.
 152                                 $this->gallery = ImageGalleryBase::factory();
 153                         }
 154
 155                         $this->gallery->setHideBadImages();
 156                         $this->gallery->setContext( $this->getContext() );
 157                 } else {
 158                         $this->imgsNoGallery = array();
 159                         $this->imgsNoGallery_start_char = array();
 160                 }
 161         }
 162
 163         /**
 164          * Add a subcategory to the internal lists, using a Category object
 165          * @param Category $cat
 166          * @param string $sortkey
 167          * @param int $pageLength
 168          */
 169         function addSubcategoryObject( Category $cat, $sortkey, $pageLength ) {
 170                 // Subcategory; strip the 'Category' namespace from the link text.
 171                 $title = $cat->getTitle();
 172
 173                 $link = Linker::link( $title, htmlspecialchars( $title->getText() ) );
 174                 if ( $title->isRedirect() ) {
 175                         // This didn't used to add redirect-in-category, but might
 176                         // as well be consistent with the rest of the sections
 177                         // on a category page.
 178                         $link = '<span class="redirect-in-category">' . $link . '</span>';
 179                 }
 180                 $this->children[] = $link;
 181
 182                 $this->children_start_char[] =
 183                         $this->getSubcategorySortChar( $cat->getTitle(), $sortkey );
 184         }
 185
 186         /**
 187          * Get the character to be used for sorting subcategories.
 188          * If there's a link from Category:A to Category:B, the sortkey of the resulting
 189          * entry in the categorylinks table is Category:A, not A, which it SHOULD be.
 190          * Workaround: If sortkey == "Category:".$title, than use $title for sorting,
 191          * else use sortkey...
 192          *
 193          * @param Title $title
 194          * @param string $sortkey The human-readable sortkey (before transforming to icu or whatever).
 195          * @return string
 196          */
 197         function getSubcategorySortChar( $title, $sortkey ) {
 198                 global $wgContLang;
 199
 200                 if ( $title->getPrefixedText() == $sortkey ) {
 201                         $word = $title->getDBkey();
 202                 } else {
 203                         $word = $sortkey;
 204                 }
 205
 206                 $firstChar = $this->collation->getFirstLetter( $word );
 207
 208                 return $wgContLang->convert( $firstChar );
 209         }
 210
 211         /**
 212          * Add a page in the image namespace
 213          * @param Title $title
 214          * @param string $sortkey
 215          * @param int $pageLength
 216          * @param bool $isRedirect
 217          */
 218         function addImage( Title $title, $sortkey, $pageLength, $isRedirect = false ) {
 219                 global $wgContLang;
 220                 if ( $this->showGallery ) {
 221                         $flip = $this->flip['file'];
 222                         if ( $flip ) {
 223                                 $this->gallery->insert( $title );
 224                         } else {
 225                                 $this->gallery->add( $title );
 226                         }
 227                 } else {
 228                         $link = Linker::link( $title );
 229                         if ( $isRedirect ) {
 230                                 // This seems kind of pointless given 'mw-redirect' class,
 231                                 // but keeping for back-compatibility with user css.
 232                                 $link = '<span class="redirect-in-category">' . $link . '</span>';
 233                         }
 234                         $this->imgsNoGallery[] = $link;
 235
 236                         $this->imgsNoGallery_start_char[] = $wgContLang->convert(
 237                                 $this->collation->getFirstLetter( $sortkey ) );
 238                 }
 239         }
 240
 241         /**
 242          * Add a miscellaneous page
 243          * @param Title $title
 244          * @param string $sortkey
 245          * @param int $pageLength
 246          * @param bool $isRedirect
 247          */
 248         function addPage( $title, $sortkey, $pageLength, $isRedirect = false ) {
 249                 global $wgContLang;
 250
 251                 $link = Linker::link( $title );
 252                 if ( $isRedirect ) {
 253                         // This seems kind of pointless given 'mw-redirect' class,
 254                         // but keeping for back-compatibility with user css.
 255                         $link = '<span class="redirect-in-category">' . $link . '</span>';
 256                 }
 257                 $this->articles[] = $link;
 258
 259                 $this->articles_start_char[] = $wgContLang->convert(
 260                         $this->collation->getFirstLetter( $sortkey ) );
 261         }
 262
 263         function finaliseCategoryState() {
 264                 if ( $this->flip['subcat'] ) {
 265                         $this->children = array_reverse( $this->children );
 266                         $this->children_start_char = array_reverse( $this->children_start_char );
 267                 }
 268                 if ( $this->flip['page'] ) {
 269                         $this->articles = array_reverse( $this->articles );
 270                         $this->articles_start_char = array_reverse( $this->articles_start_char );
 271                 }
 272                 if ( !$this->showGallery && $this->flip['file'] ) {
 273                         $this->imgsNoGallery = array_reverse( $this->imgsNoGallery );
 274                         $this->imgsNoGallery_start_char = array_reverse( $this->imgsNoGallery_start_char );
 275                 }
 276         }
 277
 278         function doCategoryQuery() {
 279                 $dbr = wfGetDB( DB_SLAVE, 'category' );
 280
 281                 $this->nextPage = array(
 282                         'page' => null,
 283                         'subcat' => null,
 284                         'file' => null,
 285                 );
 286                 $this->flip = array( 'page' => false, 'subcat' => false, 'file' => false );
 287
 288                 foreach ( array( 'page', 'subcat', 'file' ) as $type ) {
 289                         # Get the sortkeys for start/end, if applicable.  Note that if
 290                         # the collation in the database differs from the one
 291                         # set in $wgCategoryCollation, pagination might go totally haywire.
 292                         $extraConds = array( 'cl_type' => $type );
 293                         if ( isset( $this->from[$type] ) && $this->from[$type] !== null ) {
 294                                 $extraConds[] = 'cl_sortkey >= '
 295                                         . $dbr->addQuotes( $this->collation->getSortKey( $this->from[$type] ) );
 296                         } elseif ( isset( $this->until[$type] ) && $this->until[$type] !== null ) {
 297                                 $extraConds[] = 'cl_sortkey < '
 298                                         . $dbr->addQuotes( $this->collation->getSortKey( $this->until[$type] ) );
 299                                 $this->flip[$type] = true;
 300                         }
 301
 302                         $res = $dbr->select(
 303                                 array( 'page', 'categorylinks', 'category' ),
 304                                 array( 'page_id', 'page_title', 'page_namespace', 'page_len',
 305                                         'page_is_redirect', 'cl_sortkey', 'cat_id', 'cat_title',
 306                                         'cat_subcats', 'cat_pages', 'cat_files',
 307                                         'cl_sortkey_prefix', 'cl_collation' ),
 308                                 array_merge( array( 'cl_to' => $this->title->getDBkey() ), $extraConds ),
 309                                 __METHOD__,
 310                                 array(
 311                                         'USE INDEX' => array( 'categorylinks' => 'cl_sortkey' ),
 312                                         'LIMIT' => $this->limit + 1,
 313                                         'ORDER BY' => $this->flip[$type] ? 'cl_sortkey DESC' : 'cl_sortkey',
 314                                 ),
 315                                 array(
 316                                         'categorylinks' => array( 'INNER JOIN', 'cl_from = page_id' ),
 317                                         'category' => array( 'LEFT JOIN', array(
 318                                                 'cat_title = page_title',
 319                                                 'page_namespace' => NS_CATEGORY
 320                                         ))
 321                                 )
 322                         );
 323
 324                         $count = 0;
 325                         foreach ( $res as $row ) {
 326                                 $title = Title::newFromRow( $row );
 327                                 if ( $row->cl_collation === '' ) {
 328                                         // Hack to make sure that while updating from 1.16 schema
 329                                         // and db is inconsistent, that the sky doesn't fall.
 330                                         // See r83544. Could perhaps be removed in a couple decades...
 331                                         $humanSortkey = $row->cl_sortkey;
 332                                 } else {
 333                                         $humanSortkey = $title->getCategorySortkey( $row->cl_sortkey_prefix );
 334                                 }
 335
 336                                 if ( ++$count > $this->limit ) {
 337                                         # We've reached the one extra which shows that there
 338                                         # are additional pages to be had. Stop here...
 339                                         $this->nextPage[$type] = $humanSortkey;
 340                                         break;
 341                                 }
 342
 343                                 if ( $title->getNamespace() == NS_CATEGORY ) {
 344                                         $cat = Category::newFromRow( $row, $title );
 345                                         $this->addSubcategoryObject( $cat, $humanSortkey, $row->page_len );
 346                                 } elseif ( $title->getNamespace() == NS_FILE ) {
 347                                         $this->addImage( $title, $humanSortkey, $row->page_len, $row->page_is_redirect );
 348                                 } else {
 349                                         $this->addPage( $title, $humanSortkey, $row->page_len, $row->page_is_redirect );
 350                                 }
 351                         }
 352                 }
 353         }
 354
 355         /**
 356          * @return string
 357          */
 358         function getCategoryTop() {
 359                 $r = $this->getCategoryBottom();
 360                 return $r === ''
 361                         ? $r
 362                         : "<br style=\"clear:both;\"/>\n" . $r;
 363         }
 364
 365         /**
 366          * @return string
 367          */
 368         function getSubcategorySection() {
 369                 # Don't show subcategories section if there are none.
 370                 $r = '';
 371                 $rescnt = count( $this->children );
 372                 $dbcnt = $this->cat->getSubcatCount();
 373                 $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'subcat' );
 374
 375                 if ( $rescnt > 0 ) {
 376                         # Showing subcategories
 377                         $r .= "<div id=\"mw-subcategories\">\n";
 378                         $r .= '<h2>' . $this->msg( 'subcategories' )->text() . "</h2>\n";
 379                         $r .= $countmsg;
 380                         $r .= $this->getSectionPagingLinks( 'subcat' );
 381                         $r .= $this->formatList( $this->children, $this->children_start_char );
 382                         $r .= $this->getSectionPagingLinks( 'subcat' );
 383                         $r .= "\n</div>";
 384                 }
 385                 return $r;
 386         }
 387
 388         /**
 389          * @return string
 390          */
 391         function getPagesSection() {
 392                 $ti = wfEscapeWikiText( $this->title->getText() );
 393                 # Don't show articles section if there are none.
 394                 $r = '';
 395
 396                 # @todo FIXME: Here and in the other two sections: we don't need to bother
 397                 # with this rigmarole if the entire category contents fit on one page
 398                 # and have already been retrieved.  We can just use $rescnt in that
 399                 # case and save a query and some logic.
 400                 $dbcnt = $this->cat->getPageCount() - $this->cat->getSubcatCount()
 401                         - $this->cat->getFileCount();
 402                 $rescnt = count( $this->articles );
 403                 $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'article' );
 404
 405                 if ( $rescnt > 0 ) {
 406                         $r = "<div id=\"mw-pages\">\n";
 407                         $r .= '<h2>' . $this->msg( 'category_header', $ti )->text() . "</h2>\n";
 408                         $r .= $countmsg;
 409                         $r .= $this->getSectionPagingLinks( 'page' );
 410                         $r .= $this->formatList( $this->articles, $this->articles_start_char );
 411                         $r .= $this->getSectionPagingLinks( 'page' );
 412                         $r .= "\n</div>";
 413                 }
 414                 return $r;
 415         }
 416
 417         /**
 418          * @return string
 419          */
 420         function getImageSection() {
 421                 $r = '';
 422                 $rescnt = $this->showGallery ? $this->gallery->count() : count( $this->imgsNoGallery );
 423                 if ( $rescnt > 0 ) {
 424                         $dbcnt = $this->cat->getFileCount();
 425                         $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'file' );
 426
 427                         $r .= "<div id=\"mw-category-media\">\n";
 428                         $r .= '<h2>' .
 429                                 $this->msg(
 430                                         'category-media-header',
 431                                         wfEscapeWikiText( $this->title->getText() )
 432                                 )->text() .
 433                                 "</h2>\n";
 434                         $r .= $countmsg;
 435                         $r .= $this->getSectionPagingLinks( 'file' );
 436                         if ( $this->showGallery ) {
 437                                 $r .= $this->gallery->toHTML();
 438                         } else {
 439                                 $r .= $this->formatList( $this->imgsNoGallery, $this->imgsNoGallery_start_char );
 440                         }
 441                         $r .= $this->getSectionPagingLinks( 'file' );
 442                         $r .= "\n</div>";
 443                 }
 444                 return $r;
 445         }
 446
 447         /**
 448          * Get the paging links for a section (subcats/pages/files), to go at the top and bottom
 449          * of the output.
 450          *
 451          * @param string $type 'page', 'subcat', or 'file'
 452          * @return string HTML output, possibly empty if there are no other pages
 453          */
 454         private function getSectionPagingLinks( $type ) {
 455                 if ( isset( $this->until[$type] ) && $this->until[$type] !== null ) {
 456                         return $this->pagingLinks( $this->nextPage[$type], $this->until[$type], $type );
 457                 } elseif ( $this->nextPage[$type] !== null
 458                         || ( isset( $this->from[$type] ) && $this->from[$type] !== null )
 459                 ) {
 460                         return $this->pagingLinks( $this->from[$type], $this->nextPage[$type], $type );
 461                 } else {
 462                         return '';
 463                 }
 464         }
 465
 466         /**
 467          * @return string
 468          */
 469         function getCategoryBottom() {
 470                 return '';
 471         }
 472
 473         /**
 474          * Format a list of articles chunked by letter, either as a
 475          * bullet list or a columnar format, depending on the length.
 476          *
 477          * @param array $articles
 478          * @param array $articles_start_char
 479          * @param int $cutoff
 480          * @return string
 481          * @private
 482          */
 483         function formatList( $articles, $articles_start_char, $cutoff = 6 ) {
 484                 $list = '';
 485                 if ( count( $articles ) > $cutoff ) {
 486                         $list = self::columnList( $articles, $articles_start_char );
 487                 } elseif ( count( $articles ) > 0 ) {
 488                         // for short lists of articles in categories.
 489                         $list = self::shortList( $articles, $articles_start_char );
 490                 }
 491
 492                 $pageLang = $this->title->getPageLanguage();
 493                 $attribs = array( 'lang' => $pageLang->getCode(), 'dir' => $pageLang->getDir(),
 494                         'class' => 'mw-content-' . $pageLang->getDir() );
 495                 $list = Html::rawElement( 'div', $attribs, $list );
 496
 497                 return $list;
 498         }
 499
 500         /**
 501          * Format a list of articles chunked by letter in a three-column
 502          * list, ordered vertically.
 503          *
 504          * TODO: Take the headers into account when creating columns, so they're
 505          * more visually equal.
 506          *
 507          * More distant TODO: Scrap this and use CSS columns, whenever IE finally
 508          * supports those.
 509          *
 510          * @param array $articles
 511          * @param string[] $articles_start_char
 512          * @return string
 513          * @private
 514          */
 515         static function columnList( $articles, $articles_start_char ) {
 516                 $columns = array_combine( $articles, $articles_start_char );
 517                 # Split into three columns
 518                 $columns = array_chunk( $columns, ceil( count( $columns ) / 3 ), true /* preserve keys */ );
 519
 520                 $ret = '<table style="width: 100%;"><tr style="vertical-align: top;">';
 521                 $prevchar = null;
 522
 523                 foreach ( $columns as $column ) {
 524                         $ret .= '<td style="width: 33.3%;">';
 525                         $colContents = array();
 526
 527                         # Kind of like array_flip() here, but we keep duplicates in an
 528                         # array instead of dropping them.
 529                         foreach ( $column as $article => $char ) {
 530                                 if ( !isset( $colContents[$char] ) ) {
 531                                         $colContents[$char] = array();
 532                                 }
 533                                 $colContents[$char][] = $article;
 534                         }
 535
 536                         $first = true;
 537                         foreach ( $colContents as $char => $articles ) {
 538                                 # Change space to non-breaking space to keep headers aligned
 539                                 $h3char = $char === ' ' ? '&#160;' : htmlspecialchars( $char );
 540
 541                                 $ret .= '<h3>' . $h3char;
 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 .= ' ' . wfMessage( 'listingcontinuesabbrev' )->escaped();
 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";
 558                 }
 559
 560                 $ret .= '</tr></table>';
 561                 return $ret;
 562         }
 563
 564         /**
 565          * Format a list of articles chunked by letter in a bullet list.
 566          * @param array $articles
 567          * @param string[] $articles_start_char
 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                 $articleCount = count( $articles );
 575                 for ( $index = 1; $index < $articleCount; $index++ ) {
 576                         if ( $articles_start_char[$index] != $articles_start_char[$index - 1] ) {
 577                                 $r .= "</ul><h3>" . htmlspecialchars( $articles_start_char[$index] ) . "</h3>\n<ul>";
 578                         }
 579
 580                         $r .= "<li>{$articles[$index]}</li>";
 581                 }
 582                 $r .= '</ul>';
 583                 return $r;
 584         }
 585
 586         /**
 587          * Create paging links, as a helper method to getSectionPagingLinks().
 588          *
 589          * @param string $first The 'until' parameter for the generated URL
 590          * @param string $last The 'from' parameter for the generated URL
 591          * @param string $type A prefix for parameters, 'page' or 'subcat' or
 592          *     'file'
 593          * @return string HTML
 594          */
 595         private function pagingLinks( $first, $last, $type = '' ) {
 596                 $prevLink = $this->msg( 'prevn' )->numParams( $this->limit )->escaped();
 597
 598                 if ( $first != '' ) {
 599                         $prevQuery = $this->query;
 600                         $prevQuery["{$type}until"] = $first;
 601                         unset( $prevQuery["{$type}from"] );
 602                         $prevLink = Linker::linkKnown(
 603                                 $this->addFragmentToTitle( $this->title, $type ),
 604                                 $prevLink,
 605                                 array(),
 606                                 $prevQuery
 607                         );
 608                 }
 609
 610                 $nextLink = $this->msg( 'nextn' )->numParams( $this->limit )->escaped();
 611
 612                 if ( $last != '' ) {
 613                         $lastQuery = $this->query;
 614                         $lastQuery["{$type}from"] = $last;
 615                         unset( $lastQuery["{$type}until"] );
 616                         $nextLink = Linker::linkKnown(
 617                                 $this->addFragmentToTitle( $this->title, $type ),
 618                                 $nextLink,
 619                                 array(),
 620                                 $lastQuery
 621                         );
 622                 }
 623
 624                 return $this->msg( 'categoryviewer-pagedlinks' )->rawParams( $prevLink, $nextLink )->escaped();
 625         }
 626
 627         /**
 628          * Takes a title, and adds the fragment identifier that
 629          * corresponds to the correct segment of the category.
 630          *
 631          * @param Title $title The title (usually $this->title)
 632          * @param string $section Which section
 633          * @throws MWException
 634          * @return Title
 635          */
 636         private function addFragmentToTitle( $title, $section ) {
 637                 switch ( $section ) {
 638                         case 'page':
 639                                 $fragment = 'mw-pages';
 640                                 break;
 641                         case 'subcat':
 642                                 $fragment = 'mw-subcategories';
 643                                 break;
 644                         case 'file':
 645                                 $fragment = 'mw-category-media';
 646                                 break;
 647                         default:
 648                                 throw new MWException( __METHOD__ .
 649                                         " Invalid section $section." );
 650                 }
 651
 652                 return Title::makeTitle( $title->getNamespace(),
 653                         $title->getDBkey(), $fragment );
 654         }
 655
 656         /**
 657          * What to do if the category table conflicts with the number of results
 658          * returned?  This function says what. Each type is considered independently
 659          * of the other types.
 660          *
 661          * @param int $rescnt The number of items returned by our database query.
 662          * @param int $dbcnt The number of items according to the category table.
 663          * @param string $type 'subcat', 'article', or 'file'
 664          * @return string A message giving the number of items, to output to HTML.
 665          */
 666         private function getCountMessage( $rescnt, $dbcnt, $type ) {
 667                 // There are three cases:
 668                 //   1) The category table figure seems sane.  It might be wrong, but
 669                 //      we can't do anything about it if we don't recalculate it on ev-
 670                 //      ery category view.
 671                 //   2) The category table figure isn't sane, like it's smaller than the
 672                 //      number of actual results, *but* the number of results is less
 673                 //      than $this->limit and there's no offset.  In this case we still
 674                 //      know the right figure.
 675                 //   3) We have no idea.
 676
 677                 // Check if there's a "from" or "until" for anything
 678
 679                 // This is a little ugly, but we seem to use different names
 680                 // for the paging types then for the messages.
 681                 if ( $type === 'article' ) {
 682                         $pagingType = 'page';
 683                 } else {
 684                         $pagingType = $type;
 685                 }
 686
 687                 $fromOrUntil = false;
 688                 if ( ( isset( $this->from[$pagingType] ) && $this->from[$pagingType] !== null ) ||
 689                         ( isset( $this->until[$pagingType] ) && $this->until[$pagingType] !== null )
 690                 ) {
 691                         $fromOrUntil = true;
 692                 }
 693
 694                 if ( $dbcnt == $rescnt ||
 695                         ( ( $rescnt == $this->limit || $fromOrUntil ) && $dbcnt > $rescnt )
 696                 ) {
 697                         // Case 1: seems sane.
 698                         $totalcnt = $dbcnt;
 699                 } elseif ( $rescnt < $this->limit && !$fromOrUntil ) {
 700                         // Case 2: not sane, but salvageable.  Use the number of results.
 701                         // Since there are fewer than 200, we can also take this opportunity
 702                         // to refresh the incorrect category table entry -- which should be
 703                         // quick due to the small number of entries.
 704                         $totalcnt = $rescnt;
 705                         $this->cat->refreshCounts();
 706                 } else {
 707                         // Case 3: hopeless.  Don't give a total count at all.
 708                         // Messages: category-subcat-count-limited, category-article-count-limited,
 709                         // category-file-count-limited
 710                         return $this->msg( "category-$type-count-limited" )->numParams( $rescnt )->parseAsBlock();
 711                 }
 712                 // Messages: category-subcat-count, category-article-count, category-file-count
 713                 return $this->msg( "category-$type-count" )->numParams( $rescnt, $totalcnt )->parseAsBlock();
 714         }
 715 }