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 $context IContextSource
  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 $query Array
  78          */
  79         function __construct( $title, IContextSource $context, $from = array(), $until = array(), $query = array() ) {
  80                 global $wgCategoryPagingLimit;
  81                 $this->title = $title;
  82                 $this->setContext( $context );
  83                 $this->from = $from;
  84                 $this->until = $until;
  85                 $this->limit = $wgCategoryPagingLimit;
  86                 $this->cat = Category::newFromTitle( $title );
  87                 $this->query = $query;
  88                 $this->collation = Collation::singleton();
  89                 unset( $this->query['title'] );
  90         }
  91
  92         /**
  93          * Format the category data list.
  94          *
  95          * @return string HTML output
  96          */
  97         public function getHTML() {
  98                 global $wgCategoryMagicGallery;
  99                 wfProfileIn( __METHOD__ );
 100
 101                 $this->showGallery = $wgCategoryMagicGallery && !$this->getOutput()->mNoGallery;
 102
 103                 $this->clearCategoryState();
 104                 $this->doCategoryQuery();
 105                 $this->finaliseCategoryState();
 106
 107                 $r = $this->getSubcategorySection() .
 108                         $this->getPagesSection() .
 109                         $this->getImageSection();
 110
 111                 if ( $r == '' ) {
 112                         // If there is no category content to display, only
 113                         // show the top part of the navigation links.
 114                         // @todo FIXME: Cannot be completely suppressed because it
 115                         //        is unknown if 'until' or 'from' makes this
 116                         //        give 0 results.
 117                         $r = $r . $this->getCategoryTop();
 118                 } else {
 119                         $r = $this->getCategoryTop() .
 120                                 $r .
 121                                 $this->getCategoryBottom();
 122                 }
 123
 124                 // Give a proper message if category is empty
 125                 if ( $r == '' ) {
 126                         $r = $this->msg( 'category-empty' )->parseAsBlock();
 127                 }
 128
 129                 $lang = $this->getLanguage();
 130                 $langAttribs = array( 'lang' => $lang->getCode(), 'dir' => $lang->getDir() );
 131                 # put a div around the headings which are in the user language
 132                 $r = Html::openElement( 'div', $langAttribs ) . $r . '</div>';
 133
 134                 wfProfileOut( __METHOD__ );
 135                 return $r;
 136         }
 137
 138         function clearCategoryState() {
 139                 $this->articles = array();
 140                 $this->articles_start_char = array();
 141                 $this->children = array();
 142                 $this->children_start_char = array();
 143                 if ( $this->showGallery ) {
 144                         $this->gallery = ImageGalleryBase::factory();
 145                         $this->gallery->setHideBadImages();
 146                         $this->gallery->setContext( $this->getContext() );
 147                 } else {
 148                         $this->imgsNoGallery = array();
 149                         $this->imgsNoGallery_start_char = array();
 150                 }
 151         }
 152
 153         /**
 154          * Add a subcategory to the internal lists, using a Category object
 155          * @param $cat Category
 156          * @param $sortkey
 157          * @param $pageLength
 158          */
 159         function addSubcategoryObject( Category $cat, $sortkey, $pageLength ) {
 160                 // Subcategory; strip the 'Category' namespace from the link text.
 161                 $title = $cat->getTitle();
 162
 163                 $link = Linker::link( $title, htmlspecialchars( $title->getText() ) );
 164                 if ( $title->isRedirect() ) {
 165                         // This didn't used to add redirect-in-category, but might
 166                         // as well be consistent with the rest of the sections
 167                         // on a category page.
 168                         $link = '<span class="redirect-in-category">' . $link . '</span>';
 169                 }
 170                 $this->children[] = $link;
 171
 172                 $this->children_start_char[] =
 173                         $this->getSubcategorySortChar( $cat->getTitle(), $sortkey );
 174         }
 175
 176         /**
 177          * Add a subcategory to the internal lists, using a title object
 178          * @deprecated since 1.17 kept for compatibility, use addSubcategoryObject instead
 179          */
 180         function addSubcategory( Title $title, $sortkey, $pageLength ) {
 181                 wfDeprecated( __METHOD__, '1.17' );
 182                 $this->addSubcategoryObject( Category::newFromTitle( $title ), $sortkey, $pageLength );
 183         }
 184
 185         /**
 186          * Get the character to be used for sorting subcategories.
 187          * If there's a link from Category:A to Category:B, the sortkey of the resulting
 188          * entry in the categorylinks table is Category:A, not A, which it SHOULD be.
 189          * Workaround: If sortkey == "Category:".$title, than use $title for sorting,
 190          * else use sortkey...
 191          *
 192          * @param Title $title
 193          * @param string $sortkey The human-readable sortkey (before transforming to icu or whatever).
 194          * @return string
 195          */
 196         function getSubcategorySortChar( $title, $sortkey ) {
 197                 global $wgContLang;
 198
 199                 if ( $title->getPrefixedText() == $sortkey ) {
 200                         $word = $title->getDBkey();
 201                 } else {
 202                         $word = $sortkey;
 203                 }
 204
 205                 $firstChar = $this->collation->getFirstLetter( $word );
 206
 207                 return $wgContLang->convert( $firstChar );
 208         }
 209
 210         /**
 211          * Add a page in the image namespace
 212          * @param $title Title
 213          * @param $sortkey
 214          * @param $pageLength
 215          * @param $isRedirect bool
 216          */
 217         function addImage( Title $title, $sortkey, $pageLength, $isRedirect = false ) {
 218                 global $wgContLang;
 219                 if ( $this->showGallery ) {
 220                         $flip = $this->flip['file'];
 221                         if ( $flip ) {
 222                                 $this->gallery->insert( $title );
 223                         } else {
 224                                 $this->gallery->add( $title );
 225                         }
 226                 } else {
 227                         $link = Linker::link( $title );
 228                         if ( $isRedirect ) {
 229                                 // This seems kind of pointless given 'mw-redirect' class,
 230                                 // but keeping for back-compatibility with user css.
 231                                 $link = '<span class="redirect-in-category">' . $link . '</span>';
 232                         }
 233                         $this->imgsNoGallery[] = $link;
 234
 235                         $this->imgsNoGallery_start_char[] = $wgContLang->convert(
 236                                 $this->collation->getFirstLetter( $sortkey ) );
 237                 }
 238         }
 239
 240         /**
 241          * Add a miscellaneous page
 242          * @param $title
 243          * @param $sortkey
 244          * @param $pageLength
 245          * @param $isRedirect bool
 246          */
 247         function addPage( $title, $sortkey, $pageLength, $isRedirect = false ) {
 248                 global $wgContLang;
 249
 250                 $link = Linker::link( $title );
 251                 if ( $isRedirect ) {
 252                         // This seems kind of pointless given 'mw-redirect' class,
 253                         // but keeping for back-compatibility with user css.
 254                         $link = '<span class="redirect-in-category">' . $link . '</span>';
 255                 }
 256                 $this->articles[] = $link;
 257
 258                 $this->articles_start_char[] = $wgContLang->convert(
 259                         $this->collation->getFirstLetter( $sortkey ) );
 260         }
 261
 262         function finaliseCategoryState() {
 263                 if ( $this->flip['subcat'] ) {
 264                         $this->children = array_reverse( $this->children );
 265                         $this->children_start_char = array_reverse( $this->children_start_char );
 266                 }
 267                 if ( $this->flip['page'] ) {
 268                         $this->articles = array_reverse( $this->articles );
 269                         $this->articles_start_char = array_reverse( $this->articles_start_char );
 270                 }
 271                 if ( !$this->showGallery && $this->flip['file'] ) {
 272                         $this->imgsNoGallery = array_reverse( $this->imgsNoGallery );
 273                         $this->imgsNoGallery_start_char = array_reverse( $this->imgsNoGallery_start_char );
 274                 }
 275         }
 276
 277         function doCategoryQuery() {
 278                 $dbr = wfGetDB( DB_SLAVE, 'category' );
 279
 280                 $this->nextPage = array(
 281                         'page' => null,
 282                         'subcat' => null,
 283                         'file' => null,
 284                 );
 285                 $this->flip = array( 'page' => false, 'subcat' => false, 'file' => false );
 286
 287                 foreach ( array( 'page', 'subcat', 'file' ) as $type ) {
 288                         # Get the sortkeys for start/end, if applicable.  Note that if
 289                         # the collation in the database differs from the one
 290                         # set in $wgCategoryCollation, pagination might go totally haywire.
 291                         $extraConds = array( 'cl_type' => $type );
 292                         if ( isset( $this->from[$type] ) && $this->from[$type] !== null ) {
 293                                 $extraConds[] = 'cl_sortkey >= '
 294                                         . $dbr->addQuotes( $this->collation->getSortKey( $this->from[$type] ) );
 295                         } elseif ( isset( $this->until[$type] ) && $this->until[$type] !== null ) {
 296                                 $extraConds[] = 'cl_sortkey < '
 297                                         . $dbr->addQuotes( $this->collation->getSortKey( $this->until[$type] ) );
 298                                 $this->flip[$type] = true;
 299                         }
 300
 301                         $res = $dbr->select(
 302                                 array( 'page', 'categorylinks', 'category' ),
 303                                 array( 'page_id', 'page_title', 'page_namespace', 'page_len',
 304                                         'page_is_redirect', 'cl_sortkey', 'cat_id', 'cat_title',
 305                                         'cat_subcats', 'cat_pages', 'cat_files',
 306                                         'cl_sortkey_prefix', 'cl_collation' ),
 307                                 array_merge( array( 'cl_to' => $this->title->getDBkey() ), $extraConds ),
 308                                 __METHOD__,
 309                                 array(
 310                                         'USE INDEX' => array( 'categorylinks' => 'cl_sortkey' ),
 311                                         'LIMIT' => $this->limit + 1,
 312                                         'ORDER BY' => $this->flip[$type] ? 'cl_sortkey DESC' : 'cl_sortkey',
 313                                 ),
 314                                 array(
 315                                         'categorylinks' => array( 'INNER JOIN', 'cl_from = page_id' ),
 316                                         'category' => array( 'LEFT JOIN', array(
 317                                                 'cat_title = page_title',
 318                                                 'page_namespace' => NS_CATEGORY
 319                                         ))
 320                                 )
 321                         );
 322
 323                         $count = 0;
 324                         foreach ( $res as $row ) {
 325                                 $title = Title::newFromRow( $row );
 326                                 if ( $row->cl_collation === '' ) {
 327                                         // Hack to make sure that while updating from 1.16 schema
 328                                         // and db is inconsistent, that the sky doesn't fall.
 329                                         // See r83544. Could perhaps be removed in a couple decades...
 330                                         $humanSortkey = $row->cl_sortkey;
 331                                 } else {
 332                                         $humanSortkey = $title->getCategorySortkey( $row->cl_sortkey_prefix );
 333                                 }
 334
 335                                 if ( ++$count > $this->limit ) {
 336                                         # We've reached the one extra which shows that there
 337                                         # are additional pages to be had. Stop here...
 338                                         $this->nextPage[$type] = $humanSortkey;
 339                                         break;
 340                                 }
 341
 342                                 if ( $title->getNamespace() == NS_CATEGORY ) {
 343                                         $cat = Category::newFromRow( $row, $title );
 344                                         $this->addSubcategoryObject( $cat, $humanSortkey, $row->page_len );
 345                                 } elseif ( $title->getNamespace() == NS_FILE ) {
 346                                         $this->addImage( $title, $humanSortkey, $row->page_len, $row->page_is_redirect );
 347                                 } else {
 348                                         $this->addPage( $title, $humanSortkey, $row->page_len, $row->page_is_redirect );
 349                                 }
 350                         }
 351                 }
 352         }
 353
 354         /**
 355          * @return string
 356          */
 357         function getCategoryTop() {
 358                 $r = $this->getCategoryBottom();
 359                 return $r === ''
 360                         ? $r
 361                         : "<br style=\"clear:both;\"/>\n" . $r;
 362         }
 363
 364         /**
 365          * @return string
 366          */
 367         function getSubcategorySection() {
 368                 # Don't show subcategories section if there are none.
 369                 $r = '';
 370                 $rescnt = count( $this->children );
 371                 $dbcnt = $this->cat->getSubcatCount();
 372                 $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'subcat' );
 373
 374                 if ( $rescnt > 0 ) {
 375                         # Showing subcategories
 376                         $r .= "<div id=\"mw-subcategories\">\n";
 377                         $r .= '<h2>' . $this->msg( 'subcategories' )->text() . "</h2>\n";
 378                         $r .= $countmsg;
 379                         $r .= $this->getSectionPagingLinks( 'subcat' );
 380                         $r .= $this->formatList( $this->children, $this->children_start_char );
 381                         $r .= $this->getSectionPagingLinks( 'subcat' );
 382                         $r .= "\n</div>";
 383                 }
 384                 return $r;
 385         }
 386
 387         /**
 388          * @return string
 389          */
 390         function getPagesSection() {
 391                 $ti = wfEscapeWikiText( $this->title->getText() );
 392                 # Don't show articles section if there are none.
 393                 $r = '';
 394
 395                 # @todo FIXME: Here and in the other two sections: we don't need to bother
 396                 # with this rigmarole if the entire category contents fit on one page
 397                 # and have already been retrieved.  We can just use $rescnt in that
 398                 # case and save a query and some logic.
 399                 $dbcnt = $this->cat->getPageCount() - $this->cat->getSubcatCount()
 400                         - $this->cat->getFileCount();
 401                 $rescnt = count( $this->articles );
 402                 $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'article' );
 403
 404                 if ( $rescnt > 0 ) {
 405                         $r = "<div id=\"mw-pages\">\n";
 406                         $r .= '<h2>' . $this->msg( 'category_header', $ti )->text() . "</h2>\n";
 407                         $r .= $countmsg;
 408                         $r .= $this->getSectionPagingLinks( 'page' );
 409                         $r .= $this->formatList( $this->articles, $this->articles_start_char );
 410                         $r .= $this->getSectionPagingLinks( 'page' );
 411                         $r .= "\n</div>";
 412                 }
 413                 return $r;
 414         }
 415
 416         /**
 417          * @return string
 418          */
 419         function getImageSection() {
 420                 $r = '';
 421                 $rescnt = $this->showGallery ? $this->gallery->count() : count( $this->imgsNoGallery );
 422                 if ( $rescnt > 0 ) {
 423                         $dbcnt = $this->cat->getFileCount();
 424                         $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'file' );
 425
 426                         $r .= "<div id=\"mw-category-media\">\n";
 427                         $r .= '<h2>' . $this->msg( 'category-media-header', wfEscapeWikiText( $this->title->getText() ) )->text() . "</h2>\n";
 428                         $r .= $countmsg;
 429                         $r .= $this->getSectionPagingLinks( 'file' );
 430                         if ( $this->showGallery ) {
 431                                 $r .= $this->gallery->toHTML();
 432                         } else {
 433                                 $r .= $this->formatList( $this->imgsNoGallery, $this->imgsNoGallery_start_char );
 434                         }
 435                         $r .= $this->getSectionPagingLinks( 'file' );
 436                         $r .= "\n</div>";
 437                 }
 438                 return $r;
 439         }
 440
 441         /**
 442          * Get the paging links for a section (subcats/pages/files), to go at the top and bottom
 443          * of the output.
 444          *
 445          * @param string $type 'page', 'subcat', or 'file'
 446          * @return String: HTML output, possibly empty if there are no other pages
 447          */
 448         private function getSectionPagingLinks( $type ) {
 449                 if ( isset( $this->until[$type] ) && $this->until[$type] !== null ) {
 450                         return $this->pagingLinks( $this->nextPage[$type], $this->until[$type], $type );
 451                 } elseif ( $this->nextPage[$type] !== null || ( isset( $this->from[$type] ) && $this->from[$type] !== null ) ) {
 452                         return $this->pagingLinks( $this->from[$type], $this->nextPage[$type], $type );
 453                 } else {
 454                         return '';
 455                 }
 456         }
 457
 458         /**
 459          * @return string
 460          */
 461         function getCategoryBottom() {
 462                 return '';
 463         }
 464
 465         /**
 466          * Format a list of articles chunked by letter, either as a
 467          * bullet list or a columnar format, depending on the length.
 468          *
 469          * @param $articles Array
 470          * @param $articles_start_char Array
 471          * @param $cutoff Int
 472          * @return String
 473          * @private
 474          */
 475         function formatList( $articles, $articles_start_char, $cutoff = 6 ) {
 476                 $list = '';
 477                 if ( count( $articles ) > $cutoff ) {
 478                         $list = self::columnList( $articles, $articles_start_char );
 479                 } elseif ( count( $articles ) > 0 ) {
 480                         // for short lists of articles in categories.
 481                         $list = self::shortList( $articles, $articles_start_char );
 482                 }
 483
 484                 $pageLang = $this->title->getPageLanguage();
 485                 $attribs = array( 'lang' => $pageLang->getCode(), 'dir' => $pageLang->getDir(),
 486                         'class' => 'mw-content-' . $pageLang->getDir() );
 487                 $list = Html::rawElement( 'div', $attribs, $list );
 488
 489                 return $list;
 490         }
 491
 492         /**
 493          * Format a list of articles chunked by letter in a three-column
 494          * list, ordered vertically.
 495          *
 496          * TODO: Take the headers into account when creating columns, so they're
 497          * more visually equal.
 498          *
 499          * More distant TODO: Scrap this and use CSS columns, whenever IE finally
 500          * supports those.
 501          *
 502          * @param $articles Array
 503          * @param $articles_start_char Array
 504          * @return String
 505          * @private
 506          */
 507         static function columnList( $articles, $articles_start_char ) {
 508                 $columns = array_combine( $articles, $articles_start_char );
 509                 # Split into three columns
 510                 $columns = array_chunk( $columns, ceil( count( $columns ) / 3 ), true /* preserve keys */ );
 511
 512                 $ret = '<table style="width: 100%;"><tr style="vertical-align: top;">';
 513                 $prevchar = null;
 514
 515                 foreach ( $columns as $column ) {
 516                         $ret .= '<td style="width: 33.3%;">';
 517                         $colContents = array();
 518
 519                         # Kind of like array_flip() here, but we keep duplicates in an
 520                         # array instead of dropping them.
 521                         foreach ( $column as $article => $char ) {
 522                                 if ( !isset( $colContents[$char] ) ) {
 523                                         $colContents[$char] = array();
 524                                 }
 525                                 $colContents[$char][] = $article;
 526                         }
 527
 528                         $first = true;
 529                         foreach ( $colContents as $char => $articles ) {
 530                                 # Change space to non-breaking space to keep headers aligned
 531                                 $h3char = $char === ' ' ? '&#160;' : htmlspecialchars( $char );
 532
 533                                 $ret .= '<h3>' . $h3char;
 534                                 if ( $first && $char === $prevchar ) {
 535                                         # We're continuing a previous chunk at the top of a new
 536                                         # column, so add " cont." after the letter.
 537                                         $ret .= ' ' . wfMessage( 'listingcontinuesabbrev' )->escaped();
 538                                 }
 539                                 $ret .= "</h3>\n";
 540
 541                                 $ret .= '<ul><li>';
 542                                 $ret .= implode( "</li>\n<li>", $articles );
 543                                 $ret .= '</li></ul>';
 544
 545                                 $first = false;
 546                                 $prevchar = $char;
 547                         }
 548
 549                         $ret .= "</td>\n";
 550                 }
 551
 552                 $ret .= '</tr></table>';
 553                 return $ret;
 554         }
 555
 556         /**
 557          * Format a list of articles chunked by letter in a bullet list.
 558          * @param $articles Array
 559          * @param $articles_start_char Array
 560          * @return String
 561          * @private
 562          */
 563         static function shortList( $articles, $articles_start_char ) {
 564                 $r = '<h3>' . htmlspecialchars( $articles_start_char[0] ) . "</h3>\n";
 565                 $r .= '<ul><li>' . $articles[0] . '</li>';
 566                 for ( $index = 1; $index < count( $articles ); $index++ ) {
 567                         if ( $articles_start_char[$index] != $articles_start_char[$index - 1] ) {
 568                                 $r .= "</ul><h3>" . htmlspecialchars( $articles_start_char[$index] ) . "</h3>\n<ul>";
 569                         }
 570
 571                         $r .= "<li>{$articles[$index]}</li>";
 572                 }
 573                 $r .= '</ul>';
 574                 return $r;
 575         }
 576
 577         /**
 578          * Create paging links, as a helper method to getSectionPagingLinks().
 579          *
 580          * @param string $first The 'until' parameter for the generated URL
 581          * @param string $last The 'from' parameter for the generated URL
 582          * @param string $type A prefix for parameters, 'page' or 'subcat' or
 583          *     'file'
 584          * @return String HTML
 585          */
 586         private function pagingLinks( $first, $last, $type = '' ) {
 587                 $prevLink = $this->msg( 'prevn' )->numParams( $this->limit )->escaped();
 588
 589                 if ( $first != '' ) {
 590                         $prevQuery = $this->query;
 591                         $prevQuery["{$type}until"] = $first;
 592                         unset( $prevQuery["{$type}from"] );
 593                         $prevLink = Linker::linkKnown(
 594                                 $this->addFragmentToTitle( $this->title, $type ),
 595                                 $prevLink,
 596                                 array(),
 597                                 $prevQuery
 598                         );
 599                 }
 600
 601                 $nextLink = $this->msg( 'nextn' )->numParams( $this->limit )->escaped();
 602
 603                 if ( $last != '' ) {
 604                         $lastQuery = $this->query;
 605                         $lastQuery["{$type}from"] = $last;
 606                         unset( $lastQuery["{$type}until"] );
 607                         $nextLink = Linker::linkKnown(
 608                                 $this->addFragmentToTitle( $this->title, $type ),
 609                                 $nextLink,
 610                                 array(),
 611                                 $lastQuery
 612                         );
 613                 }
 614
 615                 return $this->msg( 'categoryviewer-pagedlinks' )->rawParams( $prevLink, $nextLink )->escaped();
 616         }
 617
 618         /**
 619          * Takes a title, and adds the fragment identifier that
 620          * corresponds to the correct segment of the category.
 621          *
 622          * @param Title $title: The title (usually $this->title)
 623          * @param string $section: Which section
 624          * @throws MWException
 625          * @return Title
 626          */
 627         private function addFragmentToTitle( $title, $section ) {
 628                 switch ( $section ) {
 629                         case 'page':
 630                                 $fragment = 'mw-pages';
 631                                 break;
 632                         case 'subcat':
 633                                 $fragment = 'mw-subcategories';
 634                                 break;
 635                         case 'file':
 636                                 $fragment = 'mw-category-media';
 637                                 break;
 638                         default:
 639                                 throw new MWException( __METHOD__ .
 640                                         " Invalid section $section." );
 641                 }
 642
 643                 return Title::makeTitle( $title->getNamespace(),
 644                         $title->getDBkey(), $fragment );
 645         }
 646
 647         /**
 648          * What to do if the category table conflicts with the number of results
 649          * returned?  This function says what. Each type is considered independently
 650          * of the other types.
 651          *
 652          * @param int $rescnt The number of items returned by our database query.
 653          * @param int $dbcnt The number of items according to the category table.
 654          * @param string $type 'subcat', 'article', or 'file'
 655          * @return String: A message giving the number of items, to output to HTML.
 656          */
 657         private function getCountMessage( $rescnt, $dbcnt, $type ) {
 658                 # There are three cases:
 659                 #   1) The category table figure seems sane.  It might be wrong, but
 660                 #      we can't do anything about it if we don't recalculate it on ev-
 661                 #      ery category view.
 662                 #   2) The category table figure isn't sane, like it's smaller than the
 663                 #      number of actual results, *but* the number of results is less
 664                 #      than $this->limit and there's no offset.  In this case we still
 665                 #      know the right figure.
 666                 #   3) We have no idea.
 667
 668                 # Check if there's a "from" or "until" for anything
 669
 670                 // This is a little ugly, but we seem to use different names
 671                 // for the paging types then for the messages.
 672                 if ( $type === 'article' ) {
 673                         $pagingType = 'page';
 674                 } else {
 675                         $pagingType = $type;
 676                 }
 677
 678                 $fromOrUntil = false;
 679                 if ( ( isset( $this->from[$pagingType] ) && $this->from[$pagingType] !== null ) ||
 680                         ( isset( $this->until[$pagingType] ) && $this->until[$pagingType] !== null )
 681                 ) {
 682                         $fromOrUntil = true;
 683                 }
 684
 685                 if ( $dbcnt == $rescnt ||
 686                         ( ( $rescnt == $this->limit || $fromOrUntil ) && $dbcnt > $rescnt )
 687                 ) {
 688                         # Case 1: seems sane.
 689                         $totalcnt = $dbcnt;
 690                 } elseif ( $rescnt < $this->limit && !$fromOrUntil ) {
 691                         # Case 2: not sane, but salvageable.  Use the number of results.
 692                         # Since there are fewer than 200, we can also take this opportunity
 693                         # to refresh the incorrect category table entry -- which should be
 694                         # quick due to the small number of entries.
 695                         $totalcnt = $rescnt;
 696                         $this->cat->refreshCounts();
 697                 } else {
 698                         # Case 3: hopeless.  Don't give a total count at all.
 699                         # Give grep a chance to find the usages: category-subcat-count-limited,
 700                         # category-article-count-limited, category-file-count-limited
 701                         return $this->msg( "category-$type-count-limited" )->numParams( $rescnt )->parseAsBlock();
 702                 }
 703                 # Give grep a chance to find the usages: category-subcat-count-limited,
 704                 # category-article-count-limited, category-file-count-limited
 705                 return $this->msg( "category-$type-count" )->numParams( $rescnt, $totalcnt )->parseAsBlock();
 706         }
 707 }