includes/CategoryViewer.php

   1 <?php
   2
   3 if ( !defined( 'MEDIAWIKI' ) )
   4         die( 1 );
   5
   6 class CategoryViewer extends ContextSource {
   7         var $limit, $from, $until,
   8                 $articles, $articles_start_char,
   9                 $children, $children_start_char,
  10                 $showGallery, $imgsNoGalley,
  11                 $imgsNoGallery_start_char,
  12                 $imgsNoGallery;
  13
  14         /**
  15          * @var Array
  16          */
  17         var $nextPage;
  18
  19         /**
  20          * @var Array
  21          */
  22         var $flip;
  23
  24         /**
  25          * @var Title
  26          */
  27         var $title;
  28
  29         /**
  30          * @var Collation
  31          */
  32         var $collation;
  33
  34         /**
  35          * @var ImageGallery
  36          */
  37         var $gallery;
  38
  39         /**
  40          * Category object for this page
  41          * @var Category
  42          */
  43         private $cat;
  44
  45         /**
  46          * The original query array, to be used in generating paging links.
  47          * @var array
  48          */
  49         private $query;
  50
  51         /**
  52          * Constructor
  53          *
  54          * @since 1.19 $context is a second, required parameter
  55          * @param $title Title
  56          * @param $context IContextSource
  57          * @param $from String
  58          * @param $until String
  59          * @param $query Array
  60          */
  61         function __construct( $title, IContextSource $context, $from = '', $until = '', $query = array() ) {
  62                 global $wgCategoryPagingLimit;
  63                 $this->title = $title;
  64                 $this->setContext( $context );
  65                 $this->from = $from;
  66                 $this->until = $until;
  67                 $this->limit = $wgCategoryPagingLimit;
  68                 $this->cat = Category::newFromTitle( $title );
  69                 $this->query = $query;
  70                 $this->collation = Collation::singleton();
  71                 unset( $this->query['title'] );
  72         }
  73
  74         /**
  75          * Format the category data list.
  76          *
  77          * @return string HTML output
  78          */
  79         public function getHTML() {
  80                 global $wgCategoryMagicGallery;
  81                 wfProfileIn( __METHOD__ );
  82
  83                 $this->showGallery = $wgCategoryMagicGallery && !$this->getOutput()->mNoGallery;
  84
  85                 $this->clearCategoryState();
  86                 $this->doCategoryQuery();
  87                 $this->finaliseCategoryState();
  88
  89                 $r = $this->getSubcategorySection() .
  90                         $this->getPagesSection() .
  91                         $this->getImageSection();
  92
  93                 if ( $r == '' ) {
  94                         // If there is no category content to display, only
  95                         // show the top part of the navigation links.
  96                         // @todo FIXME: Cannot be completely suppressed because it
  97                         //        is unknown if 'until' or 'from' makes this
  98                         //        give 0 results.
  99                         $r = $r . $this->getCategoryTop();
 100                 } else {
 101                         $r = $this->getCategoryTop() .
 102                                 $r .
 103                                 $this->getCategoryBottom();
 104                 }
 105
 106                 // Give a proper message if category is empty
 107                 if ( $r == '' ) {
 108                         $r = wfMsgExt( 'category-empty', array( 'parse' ) );
 109                 }
 110
 111                 $lang = $this->getLanguage();
 112                 $langAttribs = array( 'lang' => $lang->getCode(), 'dir' => $lang->getDir() );
 113                 # put a div around the headings which are in the user language
 114                 $r = Html::openElement( 'div', $langAttribs ) . $r . '</div>';
 115
 116                 wfProfileOut( __METHOD__ );
 117                 return $r;
 118         }
 119
 120         function clearCategoryState() {
 121                 $this->articles = array();
 122                 $this->articles_start_char = array();
 123                 $this->children = array();
 124                 $this->children_start_char = array();
 125                 if ( $this->showGallery ) {
 126                         $this->gallery = new ImageGallery();
 127                         $this->gallery->setHideBadImages();
 128                 } else {
 129                         $this->imgsNoGallery = array();
 130                         $this->imgsNoGallery_start_char = array();
 131                 }
 132         }
 133
 134         /**
 135          * Add a subcategory to the internal lists, using a Category object
 136          * @param $cat Category
 137          * @param $sortkey
 138          * @param $pageLength
 139          */
 140         function addSubcategoryObject( Category $cat, $sortkey, $pageLength ) {
 141                 // Subcategory; strip the 'Category' namespace from the link text.
 142                 $title = $cat->getTitle();
 143
 144                 $link = Linker::link( $title, htmlspecialchars( $title->getText() ) );
 145                 if ( $title->isRedirect() ) {
 146                         // This didn't used to add redirect-in-category, but might
 147                         // as well be consistent with the rest of the sections
 148                         // on a category page.
 149                         $link = '<span class="redirect-in-category">' . $link . '</span>';
 150                 }
 151                 $this->children[] = $link;
 152
 153                 $this->children_start_char[] =
 154                         $this->getSubcategorySortChar( $cat->getTitle(), $sortkey );
 155         }
 156
 157         /**
 158          * Add a subcategory to the internal lists, using a title object
 159          * @deprecated since 1.17 kept for compatibility, please use addSubcategoryObject instead
 160          */
 161         function addSubcategory( Title $title, $sortkey, $pageLength ) {
 162                 wfDeprecated( __METHOD__, '1.17' );
 163                 $this->addSubcategoryObject( Category::newFromTitle( $title ), $sortkey, $pageLength );
 164         }
 165
 166         /**
 167         * Get the character to be used for sorting subcategories.
 168         * If there's a link from Category:A to Category:B, the sortkey of the resulting
 169         * entry in the categorylinks table is Category:A, not A, which it SHOULD be.
 170         * Workaround: If sortkey == "Category:".$title, than use $title for sorting,
 171         * else use sortkey...
 172         *
 173         * @param Title $title
 174         * @param string $sortkey The human-readable sortkey (before transforming to icu or whatever).
 175          * @return string
 176          */
 177         function getSubcategorySortChar( $title, $sortkey ) {
 178                 global $wgContLang;
 179
 180                 if ( $title->getPrefixedText() == $sortkey ) {
 181                         $word = $title->getDBkey();
 182                 } else {
 183                         $word = $sortkey;
 184                 }
 185
 186                 $firstChar = $this->collation->getFirstLetter( $word );
 187
 188                 return $wgContLang->convert( $firstChar );
 189         }
 190
 191         /**
 192          * Add a page in the image namespace
 193          * @param $title Title
 194          * @param $sortkey
 195          * @param $pageLength
 196          * @param $isRedirect bool
 197          */
 198         function addImage( Title $title, $sortkey, $pageLength, $isRedirect = false ) {
 199                 global $wgContLang;
 200                 if ( $this->showGallery ) {
 201                         $flip = $this->flip['file'];
 202                         if ( $flip ) {
 203                                 $this->gallery->insert( $title );
 204                         } else {
 205                                 $this->gallery->add( $title );
 206                         }
 207                 } else {
 208                         $link = Linker::link( $title );
 209                         if ( $isRedirect ) {
 210                                 // This seems kind of pointless given 'mw-redirect' class,
 211                                 // but keeping for back-compatibility with user css.
 212                                 $link = '<span class="redirect-in-category">' . $link . '</span>';
 213                         }
 214                         $this->imgsNoGallery[] = $link;
 215
 216                         $this->imgsNoGallery_start_char[] = $wgContLang->convert(
 217                                 $this->collation->getFirstLetter( $sortkey ) );
 218                 }
 219         }
 220
 221         /**
 222          * Add a miscellaneous page
 223          * @param $title
 224          * @param $sortkey
 225          * @param $pageLength
 226          * @param $isRedirect bool
 227          */
 228         function addPage( $title, $sortkey, $pageLength, $isRedirect = false ) {
 229                 global $wgContLang;
 230
 231                 $link = Linker::link( $title );
 232                 if ( $isRedirect ) {
 233                         // This seems kind of pointless given 'mw-redirect' class,
 234                         // but keeping for back-compatiability with user css.
 235                         $link = '<span class="redirect-in-category">' . $link . '</span>';
 236                 }
 237                 $this->articles[] = $link;
 238
 239                 $this->articles_start_char[] = $wgContLang->convert(
 240                         $this->collation->getFirstLetter( $sortkey ) );
 241         }
 242
 243         function finaliseCategoryState() {
 244                 if ( $this->flip['subcat'] ) {
 245                         $this->children            = array_reverse( $this->children );
 246                         $this->children_start_char = array_reverse( $this->children_start_char );
 247                 }
 248                 if ( $this->flip['page'] ) {
 249                         $this->articles            = array_reverse( $this->articles );
 250                         $this->articles_start_char = array_reverse( $this->articles_start_char );
 251                 }
 252                 if ( !$this->showGallery && $this->flip['file'] ) {
 253                         $this->imgsNoGallery            = array_reverse( $this->imgsNoGallery );
 254                         $this->imgsNoGallery_start_char = array_reverse( $this->imgsNoGallery_start_char );
 255                 }
 256         }
 257
 258         function doCategoryQuery() {
 259                 $dbr = wfGetDB( DB_SLAVE, 'category' );
 260
 261                 $this->nextPage = array(
 262                         'page' => null,
 263                         'subcat' => null,
 264                         'file' => null,
 265                 );
 266                 $this->flip = array( 'page' => false, 'subcat' => false, 'file' => false );
 267
 268                 foreach ( array( 'page', 'subcat', 'file' ) as $type ) {
 269                         # Get the sortkeys for start/end, if applicable.  Note that if
 270                         # the collation in the database differs from the one
 271                         # set in $wgCategoryCollation, pagination might go totally haywire.
 272                         $extraConds = array( 'cl_type' => $type );
 273                         if ( $this->from[$type] !== null ) {
 274                                 $extraConds[] = 'cl_sortkey >= '
 275                                         . $dbr->addQuotes( $this->collation->getSortKey( $this->from[$type] ) );
 276                         } elseif ( $this->until[$type] !== null ) {
 277                                 $extraConds[] = 'cl_sortkey < '
 278                                         . $dbr->addQuotes( $this->collation->getSortKey( $this->until[$type] ) );
 279                                 $this->flip[$type] = true;
 280                         }
 281
 282                         $res = $dbr->select(
 283                                 array( 'page', 'categorylinks', 'category' ),
 284                                 array( 'page_id', 'page_title', 'page_namespace', 'page_len',
 285                                         'page_is_redirect', 'cl_sortkey', 'cat_id', 'cat_title',
 286                                         'cat_subcats', 'cat_pages', 'cat_files',
 287                                         'cl_sortkey_prefix', 'cl_collation' ),
 288                                 array_merge( array( 'cl_to' => $this->title->getDBkey() ),  $extraConds ),
 289                                 __METHOD__,
 290                                 array(
 291                                         'USE INDEX' => array( 'categorylinks' => 'cl_sortkey' ),
 292                                         'LIMIT' => $this->limit + 1,
 293                                         'ORDER BY' => $this->flip[$type] ? 'cl_sortkey DESC' : 'cl_sortkey',
 294                                 ),
 295                                 array(
 296                                         'categorylinks'  => array( 'INNER JOIN', 'cl_from = page_id' ),
 297                                         'category' => array( 'LEFT JOIN', 'cat_title = page_title AND page_namespace = ' . NS_CATEGORY )
 298                                 )
 299                         );
 300
 301                         $count = 0;
 302                         foreach ( $res as $row ) {
 303                                 $title = Title::newFromRow( $row );
 304                                 if ( $row->cl_collation === '' ) {
 305                                         // Hack to make sure that while updating from 1.16 schema
 306                                         // and db is inconsistent, that the sky doesn't fall.
 307                                         // See r83544. Could perhaps be removed in a couple decades...
 308                                         $humanSortkey = $row->cl_sortkey;
 309                                 } else {
 310                                         $humanSortkey = $title->getCategorySortkey( $row->cl_sortkey_prefix );
 311                                 }
 312
 313                                 if ( ++$count > $this->limit ) {
 314                                         # We've reached the one extra which shows that there
 315                                         # are additional pages to be had. Stop here...
 316                                         $this->nextPage[$type] = $humanSortkey;
 317                                         break;
 318                                 }
 319
 320                                 if ( $title->getNamespace() == NS_CATEGORY ) {
 321                                         $cat = Category::newFromRow( $row, $title );
 322                                         $this->addSubcategoryObject( $cat, $humanSortkey, $row->page_len );
 323                                 } elseif ( $title->getNamespace() == NS_FILE ) {
 324                                         $this->addImage( $title, $humanSortkey, $row->page_len, $row->page_is_redirect );
 325                                 } else {
 326                                         $this->addPage( $title, $humanSortkey, $row->page_len, $row->page_is_redirect );
 327                                 }
 328                         }
 329                 }
 330         }
 331
 332         /**
 333          * @return string
 334          */
 335         function getCategoryTop() {
 336                 $r = $this->getCategoryBottom();
 337                 return $r === ''
 338                         ? $r
 339                         : "<br style=\"clear:both;\"/>\n" . $r;
 340         }
 341
 342         /**
 343          * @return string
 344          */
 345         function getSubcategorySection() {
 346                 # Don't show subcategories section if there are none.
 347                 $r = '';
 348                 $rescnt = count( $this->children );
 349                 $dbcnt = $this->cat->getSubcatCount();
 350                 $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'subcat' );
 351
 352                 if ( $rescnt > 0 ) {
 353                         # Showing subcategories
 354                         $r .= "<div id=\"mw-subcategories\">\n";
 355                         $r .= '<h2>' . wfMsg( 'subcategories' ) . "</h2>\n";
 356                         $r .= $countmsg;
 357                         $r .= $this->getSectionPagingLinks( 'subcat' );
 358                         $r .= $this->formatList( $this->children, $this->children_start_char );
 359                         $r .= $this->getSectionPagingLinks( 'subcat' );
 360                         $r .= "\n</div>";
 361                 }
 362                 return $r;
 363         }
 364
 365         /**
 366          * @return string
 367          */
 368         function getPagesSection() {
 369                 $ti = htmlspecialchars( $this->title->getText() );
 370                 # Don't show articles section if there are none.
 371                 $r = '';
 372
 373                 # @todo FIXME: Here and in the other two sections: we don't need to bother
 374                 # with this rigamarole if the entire category contents fit on one page
 375                 # and have already been retrieved.  We can just use $rescnt in that
 376                 # case and save a query and some logic.
 377                 $dbcnt = $this->cat->getPageCount() - $this->cat->getSubcatCount()
 378                         - $this->cat->getFileCount();
 379                 $rescnt = count( $this->articles );
 380                 $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'article' );
 381
 382                 if ( $rescnt > 0 ) {
 383                         $r = "<div id=\"mw-pages\">\n";
 384                         $r .= '<h2>' . wfMsg( 'category_header', $ti ) . "</h2>\n";
 385                         $r .= $countmsg;
 386                         $r .= $this->getSectionPagingLinks( 'page' );
 387                         $r .= $this->formatList( $this->articles, $this->articles_start_char );
 388                         $r .= $this->getSectionPagingLinks( 'page' );
 389                         $r .= "\n</div>";
 390                 }
 391                 return $r;
 392         }
 393
 394         /**
 395          * @return string
 396          */
 397         function getImageSection() {
 398                 $r = '';
 399                 $rescnt = $this->showGallery ? $this->gallery->count() : count( $this->imgsNoGallery );
 400                 if ( $rescnt > 0 ) {
 401                         $dbcnt = $this->cat->getFileCount();
 402                         $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'file' );
 403
 404                         $r .= "<div id=\"mw-category-media\">\n";
 405                         $r .= '<h2>' . wfMsg( 'category-media-header', htmlspecialchars( $this->title->getText() ) ) . "</h2>\n";
 406                         $r .= $countmsg;
 407                         $r .= $this->getSectionPagingLinks( 'file' );
 408                         if ( $this->showGallery ) {
 409                                 $r .= $this->gallery->toHTML();
 410                         } else {
 411                                 $r .= $this->formatList( $this->imgsNoGallery, $this->imgsNoGallery_start_char );
 412                         }
 413                         $r .= $this->getSectionPagingLinks( 'file' );
 414                         $r .= "\n</div>";
 415                 }
 416                 return $r;
 417         }
 418
 419         /**
 420          * Get the paging links for a section (subcats/pages/files), to go at the top and bottom
 421          * of the output.
 422          *
 423          * @param $type String: 'page', 'subcat', or 'file'
 424          * @return String: HTML output, possibly empty if there are no other pages
 425          */
 426         private function getSectionPagingLinks( $type ) {
 427                 if ( $this->until[$type] !== null ) {
 428                         return $this->pagingLinks( $this->nextPage[$type], $this->until[$type], $type );
 429                 } elseif ( $this->nextPage[$type] !== null || $this->from[$type] !== null ) {
 430                         return $this->pagingLinks( $this->from[$type], $this->nextPage[$type], $type );
 431                 } else {
 432                         return '';
 433                 }
 434         }
 435
 436         /**
 437          * @return string
 438          */
 439         function getCategoryBottom() {
 440                 return '';
 441         }
 442
 443         /**
 444          * Format a list of articles chunked by letter, either as a
 445          * bullet list or a columnar format, depending on the length.
 446          *
 447          * @param $articles Array
 448          * @param $articles_start_char Array
 449          * @param $cutoff Int
 450          * @return String
 451          * @private
 452          */
 453         function formatList( $articles, $articles_start_char, $cutoff = 6 ) {
 454                 $list = '';
 455                 if ( count ( $articles ) > $cutoff ) {
 456                         $list = self::columnList( $articles, $articles_start_char );
 457                 } elseif ( count( $articles ) > 0 ) {
 458                         // for short lists of articles in categories.
 459                         $list = self::shortList( $articles, $articles_start_char );
 460                 }
 461
 462                 $pageLang = $this->title->getPageLanguage();
 463                 $attribs = array( 'lang' => $pageLang->getCode(), 'dir' => $pageLang->getDir(),
 464                         'class' => 'mw-content-'.$pageLang->getDir() );
 465                 $list = Html::rawElement( 'div', $attribs, $list );
 466
 467                 return $list;
 468         }
 469
 470         /**
 471          * Format a list of articles chunked by letter in a three-column
 472          * list, ordered vertically.
 473          *
 474          * TODO: Take the headers into account when creating columns, so they're
 475          * more visually equal.
 476          *
 477          * More distant TODO: Scrap this and use CSS columns, whenever IE finally
 478          * supports those.
 479          *
 480          * @param $articles Array
 481          * @param $articles_start_char Array
 482          * @return String
 483          * @private
 484          */
 485         static function columnList( $articles, $articles_start_char ) {
 486                 $columns = array_combine( $articles, $articles_start_char );
 487                 # Split into three columns
 488                 $columns = array_chunk( $columns, ceil( count( $columns ) / 3 ), true /* preserve keys */ );
 489
 490                 $ret = '<table width="100%"><tr valign="top">';
 491                 $prevchar = null;
 492
 493                 foreach ( $columns as $column ) {
 494                         $ret .= '<td width="33.3%">';
 495                         $colContents = array();
 496
 497                         # Kind of like array_flip() here, but we keep duplicates in an
 498                         # array instead of dropping them.
 499                         foreach ( $column as $article => $char ) {
 500                                 if ( !isset( $colContents[$char] ) ) {
 501                                         $colContents[$char] = array();
 502                                 }
 503                                 $colContents[$char][] = $article;
 504                         }
 505
 506                         $first = true;
 507                         foreach ( $colContents as $char => $articles ) {
 508                                 $ret .= '<h3>' . htmlspecialchars( $char );
 509                                 if ( $first && $char === $prevchar ) {
 510                                         # We're continuing a previous chunk at the top of a new
 511                                         # column, so add " cont." after the letter.
 512                                         $ret .= ' ' . wfMsgHtml( 'listingcontinuesabbrev' );
 513                                 }
 514                                 $ret .= "</h3>\n";
 515
 516                                 $ret .= '<ul><li>';
 517                                 $ret .= implode( "</li>\n<li>", $articles );
 518                                 $ret .= '</li></ul>';
 519
 520                                 $first = false;
 521                                 $prevchar = $char;
 522                         }
 523
 524                         $ret .= "</td>\n";
 525                 }
 526
 527                 $ret .= '</tr></table>';
 528                 return $ret;
 529         }
 530
 531         /**
 532          * Format a list of articles chunked by letter in a bullet list.
 533          * @param $articles Array
 534          * @param $articles_start_char Array
 535          * @return String
 536          * @private
 537          */
 538         static function shortList( $articles, $articles_start_char ) {
 539                 $r = '<h3>' . htmlspecialchars( $articles_start_char[0] ) . "</h3>\n";
 540                 $r .= '<ul><li>' . $articles[0] . '</li>';
 541                 for ( $index = 1; $index < count( $articles ); $index++ ) {
 542                         if ( $articles_start_char[$index] != $articles_start_char[$index - 1] ) {
 543                                 $r .= "</ul><h3>" . htmlspecialchars( $articles_start_char[$index] ) . "</h3>\n<ul>";
 544                         }
 545
 546                         $r .= "<li>{$articles[$index]}</li>";
 547                 }
 548                 $r .= '</ul>';
 549                 return $r;
 550         }
 551
 552         /**
 553          * Create paging links, as a helper method to getSectionPagingLinks().
 554          *
 555          * @param $first String The 'until' parameter for the generated URL
 556          * @param $last String The 'from' parameter for the genererated URL
 557          * @param $type String A prefix for parameters, 'page' or 'subcat' or
 558          *     'file'
 559          * @return String HTML
 560          */
 561         private function pagingLinks( $first, $last, $type = '' ) {
 562                 $prevLink = wfMessage( 'prevn' )->numParams( $this->limit )->escaped();
 563
 564                 if ( $first != '' ) {
 565                         $prevQuery = $this->query;
 566                         $prevQuery["{$type}until"] = $first;
 567                         unset( $prevQuery["{$type}from"] );
 568                         $prevLink = Linker::linkKnown(
 569                                 $this->addFragmentToTitle( $this->title, $type ),
 570                                 $prevLink,
 571                                 array(),
 572                                 $prevQuery
 573                         );
 574                 }
 575
 576                 $nextLink = wfMessage( 'nextn' )->numParams( $this->limit )->escaped();
 577
 578                 if ( $last != '' ) {
 579                         $lastQuery = $this->query;
 580                         $lastQuery["{$type}from"] = $last;
 581                         unset( $lastQuery["{$type}until"] );
 582                         $nextLink = Linker::linkKnown(
 583                                 $this->addFragmentToTitle( $this->title, $type ),
 584                                 $nextLink,
 585                                 array(),
 586                                 $lastQuery
 587                         );
 588                 }
 589
 590                 return "($prevLink) ($nextLink)";
 591         }
 592
 593         /**
 594          * Takes a title, and adds the fragment identifier that
 595          * corresponds to the correct segment of the category.
 596          *
 597          * @param Title $title: The title (usually $this->title)
 598          * @param String $section: Which section
 599          * @return Title
 600          */
 601         private function addFragmentToTitle( $title, $section ) {
 602                 switch ( $section ) {
 603                         case 'page':
 604                                 $fragment = 'mw-pages';
 605                                 break;
 606                         case 'subcat':
 607                                 $fragment = 'mw-subcategories';
 608                                 break;
 609                         case 'file':
 610                                 $fragment = 'mw-category-media';
 611                                 break;
 612                         default:
 613                                 throw new MWException( __METHOD__ .
 614                                         " Invalid section $section." );
 615                 }
 616
 617                 return Title::makeTitle( $title->getNamespace(),
 618                         $title->getDBkey(), $fragment );
 619         }
 620         /**
 621          * What to do if the category table conflicts with the number of results
 622          * returned?  This function says what. Each type is considered independently
 623          * of the other types.
 624          *
 625          * Note for grepping: uses the messages category-article-count,
 626          * category-article-count-limited, category-subcat-count,
 627          * category-subcat-count-limited, category-file-count,
 628          * category-file-count-limited.
 629          *
 630          * @param $rescnt Int: The number of items returned by our database query.
 631          * @param $dbcnt Int: The number of items according to the category table.
 632          * @param $type String: 'subcat', 'article', or 'file'
 633          * @return String: A message giving the number of items, to output to HTML.
 634          */
 635         private function getCountMessage( $rescnt, $dbcnt, $type ) {
 636                 # There are three cases:
 637                 #   1) The category table figure seems sane.  It might be wrong, but
 638                 #      we can't do anything about it if we don't recalculate it on ev-
 639                 #      ery category view.
 640                 #   2) The category table figure isn't sane, like it's smaller than the
 641                 #      number of actual results, *but* the number of results is less
 642                 #      than $this->limit and there's no offset.  In this case we still
 643                 #      know the right figure.
 644                 #   3) We have no idea.
 645
 646                 # Check if there's a "from" or "until" for anything
 647
 648                 // This is a little ugly, but we seem to use different names
 649                 // for the paging types then for the messages.
 650                 if ( $type === 'article' ) {
 651                         $pagingType = 'page';
 652                 } else {
 653                         $pagingType = $type;
 654                 }
 655
 656                 $fromOrUntil = false;
 657                 if ( $this->from[$pagingType] !== null || $this->until[$pagingType] !== null ) {
 658                         $fromOrUntil = true;
 659                 }
 660
 661                 if ( $dbcnt == $rescnt || ( ( $rescnt == $this->limit || $fromOrUntil )
 662                         && $dbcnt > $rescnt ) ) {
 663                         # Case 1: seems sane.
 664                         $totalcnt = $dbcnt;
 665                 } elseif ( $rescnt < $this->limit && !$fromOrUntil ) {
 666                         # Case 2: not sane, but salvageable.  Use the number of results.
 667                         # Since there are fewer than 200, we can also take this opportunity
 668                         # to refresh the incorrect category table entry -- which should be
 669                         # quick due to the small number of entries.
 670                         $totalcnt = $rescnt;
 671                         $this->cat->refreshCounts();
 672                 } else {
 673                         # Case 3: hopeless.  Don't give a total count at all.
 674                         return wfMessage( "category-$type-count-limited" )->numParams( $rescnt )->parseAsBlock();
 675                 }
 676                 return wfMessage( "category-$type-count" )->numParams( $rescnt, $totalcnt )->parseAsBlock();
 677         }
 678 }