includes/CategoryPage.php

   1 <?php
   2 /**
   3  * Special handling for category description pages.
   4  * Modelled after ImagePage.php.
   5  *
   6  * @file
   7  */
   8
   9 if ( !defined( 'MEDIAWIKI' ) )
  10         die( 1 );
  11
  12 /**
  13  * Special handling for category description pages, showing pages,
  14  * subcategories and file that belong to the category
  15  */
  16 class CategoryPage extends Article {
  17         # Subclasses can change this to override the viewer class.
  18         protected $mCategoryViewerClass = 'CategoryViewer';
  19
  20         function view() {
  21                 global $wgRequest, $wgUser;
  22
  23                 $diff = $wgRequest->getVal( 'diff' );
  24                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
  25
  26                 if ( isset( $diff ) && $diffOnly ) {
  27                         return parent::view();
  28                 }
  29
  30                 if ( !wfRunHooks( 'CategoryPageView', array( &$this ) ) ) {
  31                         return;
  32                 }
  33
  34                 if ( NS_CATEGORY == $this->mTitle->getNamespace() ) {
  35                         $this->openShowCategory();
  36                 }
  37
  38                 parent::view();
  39
  40                 if ( NS_CATEGORY == $this->mTitle->getNamespace() ) {
  41                         $this->closeShowCategory();
  42                 }
  43         }
  44
  45         /**
  46          * Don't return a 404 for categories in use.
  47          * In use defined as: either the actual page exists
  48          * or the category currently has members.
  49          */
  50         function hasViewableContent() {
  51                 if ( parent::hasViewableContent() ) {
  52                         return true;
  53                 } else {
  54                         $cat = Category::newFromTitle( $this->mTitle );
  55                         // If any of these are not 0, then has members
  56                         if ( $cat->getPageCount()
  57                                 || $cat->getSubcatCount()
  58                                 || $cat->getFileCount()
  59                         ) {
  60                                 return true;
  61                         }
  62                 }
  63                 return false;
  64         }
  65
  66         function openShowCategory() {
  67                 # For overloading
  68         }
  69
  70         function closeShowCategory() {
  71                 global $wgOut, $wgRequest;
  72
  73                 // Use these as defaults for back compat --catrope
  74                 $oldFrom = $wgRequest->getVal( 'from' );
  75                 $oldUntil = $wgRequest->getVal( 'until' );
  76
  77                 $from = $until = array();
  78                 foreach ( array( 'page', 'subcat', 'file' ) as $type ) {
  79                         $from[$type] = $wgRequest->getVal( "{$type}from", $oldFrom );
  80                         $until[$type] = $wgRequest->getVal( "{$type}until", $oldUntil );
  81                 }
  82
  83                 $viewer = new $this->mCategoryViewerClass( $this->mTitle, $from, $until, $wgRequest->getValues() );
  84                 $wgOut->addHTML( $viewer->getHTML() );
  85         }
  86 }
  87
  88 class CategoryViewer {
  89         var $limit, $from, $until,
  90                 $articles, $articles_start_char,
  91                 $children, $children_start_char,
  92                 $showGallery, $imgsNoGalley,
  93                 $imgsNoGallery_start_char,
  94                 $skin, $imgsNoGallery;
  95
  96         /**
  97          * @var
  98          */
  99         var $nextPage;
 100
 101         /**
 102          * @var Array
 103          */
 104         var $flip;
 105
 106         /**
 107          * @var Title
 108          */
 109         var $title;
 110
 111         /**
 112          * @var Collation
 113          */
 114         var $collation;
 115
 116         /**
 117          * @var ImageGallery
 118          */
 119         var $gallery;
 120
 121         /**
 122          * Category object for this page
 123          * @var Category
 124          */
 125         private $cat;
 126
 127         /**
 128          * The original query array, to be used in generating paging links.
 129          * @var array
 130          */
 131         private $query;
 132
 133         function __construct( $title, $from = '', $until = '', $query = array() ) {
 134                 global $wgCategoryPagingLimit;
 135                 $this->title = $title;
 136                 $this->from = $from;
 137                 $this->until = $until;
 138                 $this->limit = $wgCategoryPagingLimit;
 139                 $this->cat = Category::newFromTitle( $title );
 140                 $this->query = $query;
 141                 $this->collation = Collation::singleton();
 142                 unset( $this->query['title'] );
 143         }
 144
 145         /**
 146          * Format the category data list.
 147          *
 148          * @return string HTML output
 149          */
 150         public function getHTML() {
 151                 global $wgOut, $wgCategoryMagicGallery, $wgContLang;
 152                 wfProfileIn( __METHOD__ );
 153
 154                 $this->showGallery = $wgCategoryMagicGallery && !$wgOut->mNoGallery;
 155
 156                 $this->clearCategoryState();
 157                 $this->doCategoryQuery();
 158                 $this->finaliseCategoryState();
 159
 160                 $r = $this->getSubcategorySection() .
 161                         $this->getPagesSection() .
 162                         $this->getImageSection();
 163
 164                 if ( $r == '' ) {
 165                         // If there is no category content to display, only
 166                         // show the top part of the navigation links.
 167                         // @todo FIXME: Cannot be completely suppressed because it
 168                         //        is unknown if 'until' or 'from' makes this
 169                         //        give 0 results.
 170                         $r = $r . $this->getCategoryTop();
 171                 } else {
 172                         $r = $this->getCategoryTop() .
 173                                 $r .
 174                                 $this->getCategoryBottom();
 175                 }
 176
 177                 // Give a proper message if category is empty
 178                 if ( $r == '' ) {
 179                         $r = wfMsgExt( 'category-empty', array( 'parse' ) );
 180                 }
 181
 182                 global $wgBetterDirectionality, $wgLang;
 183                 if( $wgBetterDirectionality ) {
 184                         $langAttribs = array( 'lang' => $wgLang->getCode(), 'dir' => $wgLang->getDir() );
 185                         $r = Html::rawElement( 'div', $langAttribs, $r );
 186                 }
 187
 188                 wfProfileOut( __METHOD__ );
 189                 return $wgContLang->convert( $r );
 190         }
 191
 192         function clearCategoryState() {
 193                 $this->articles = array();
 194                 $this->articles_start_char = array();
 195                 $this->children = array();
 196                 $this->children_start_char = array();
 197                 if ( $this->showGallery ) {
 198                         $this->gallery = new ImageGallery();
 199                         $this->gallery->setHideBadImages();
 200                 } else {
 201                         $this->imgsNoGallery = array();
 202                         $this->imgsNoGallery_start_char = array();
 203                 }
 204         }
 205
 206         /**
 207          * @return Skin
 208          */
 209         function getSkin() {
 210                 if ( !$this->skin ) {
 211                         global $wgUser;
 212                         $this->skin = $wgUser->getSkin();
 213                 }
 214                 return $this->skin;
 215         }
 216
 217         /**
 218          * Add a subcategory to the internal lists, using a Category object
 219          */
 220         function addSubcategoryObject( Category $cat, $sortkey, $pageLength ) {
 221                 // Subcategory; strip the 'Category' namespace from the link text.
 222                 $title = $cat->getTitle();
 223
 224                 $link = $this->getSkin()->link( $title, $title->getText() );
 225                 if ( $title->isRedirect() ) {
 226                         // This didn't used to add redirect-in-category, but might
 227                         // as well be consistent with the rest of the sections
 228                         // on a category page.
 229                         $link = '<span class="redirect-in-category">' . $link . '</span>';
 230                 }
 231                 $this->children[] = $link;
 232
 233                 $this->children_start_char[] =
 234                         $this->getSubcategorySortChar( $cat->getTitle(), $sortkey );
 235         }
 236
 237         /**
 238          * Add a subcategory to the internal lists, using a title object
 239          * @deprecated since 1.17 kept for compatibility, please use addSubcategoryObject instead
 240          */
 241         function addSubcategory( Title $title, $sortkey, $pageLength ) {
 242                 $this->addSubcategoryObject( Category::newFromTitle( $title ), $sortkey, $pageLength );
 243         }
 244
 245         /**
 246         * Get the character to be used for sorting subcategories.
 247         * If there's a link from Category:A to Category:B, the sortkey of the resulting
 248         * entry in the categorylinks table is Category:A, not A, which it SHOULD be.
 249         * Workaround: If sortkey == "Category:".$title, than use $title for sorting,
 250         * else use sortkey...
 251         *
 252         * @param Title $title
 253         * @param string $sortkey The human-readable sortkey (before transforming to icu or whatever).
 254         */
 255         function getSubcategorySortChar( $title, $sortkey ) {
 256                 global $wgContLang;
 257
 258                 if ( $title->getPrefixedText() == $sortkey ) {
 259                         $word = $title->getDBkey();
 260                 } else {
 261                         $word = $sortkey;
 262                 }
 263
 264                 $firstChar = $this->collation->getFirstLetter( $word );
 265
 266                 return $wgContLang->convert( $firstChar );
 267         }
 268
 269         /**
 270          * Add a page in the image namespace
 271          */
 272         function addImage( Title $title, $sortkey, $pageLength, $isRedirect = false ) {
 273                 global $wgContLang;
 274                 if ( $this->showGallery ) {
 275                         $flip = $this->flip['file'];
 276                         if ( $flip ) {
 277                                 $this->gallery->insert( $title );
 278                         } else {
 279                                 $this->gallery->add( $title );
 280                         }
 281                 } else {
 282                         $link = $this->getSkin()->link( $title );
 283                         if ( $isRedirect ) {
 284                                 // This seems kind of pointless given 'mw-redirect' class,
 285                                 // but keeping for back-compatibility with user css.
 286                                 $link = '<span class="redirect-in-category">' . $link . '</span>';
 287                         }
 288                         $this->imgsNoGallery[] = $link;
 289
 290                         $this->imgsNoGallery_start_char[] = $wgContLang->convert(
 291                                 $this->collation->getFirstLetter( $sortkey ) );
 292                 }
 293         }
 294
 295         /**
 296          * Add a miscellaneous page
 297          */
 298         function addPage( $title, $sortkey, $pageLength, $isRedirect = false ) {
 299                 global $wgContLang;
 300
 301                 $link = $this->getSkin()->link( $title );
 302                 if ( $isRedirect ) {
 303                         // This seems kind of pointless given 'mw-redirect' class,
 304                         // but keeping for back-compatiability with user css.
 305                         $link = '<span class="redirect-in-category">' . $link . '</span>';
 306                 }
 307                 $this->articles[] = $link;
 308
 309                 $this->articles_start_char[] = $wgContLang->convert(
 310                         $this->collation->getFirstLetter( $sortkey ) );
 311         }
 312
 313         function finaliseCategoryState() {
 314                 if ( $this->flip['subcat'] ) {
 315                         $this->children            = array_reverse( $this->children );
 316                         $this->children_start_char = array_reverse( $this->children_start_char );
 317                 }
 318                 if ( $this->flip['page'] ) {
 319                         $this->articles            = array_reverse( $this->articles );
 320                         $this->articles_start_char = array_reverse( $this->articles_start_char );
 321                 }
 322                 if ( !$this->showGallery && $this->flip['file'] ) {
 323                         $this->imgsNoGallery            = array_reverse( $this->imgsNoGallery );
 324                         $this->imgsNoGallery_start_char = array_reverse( $this->imgsNoGallery_start_char );
 325                 }
 326         }
 327
 328         function doCategoryQuery() {
 329                 $dbr = wfGetDB( DB_SLAVE, 'category' );
 330
 331                 $this->nextPage = array(
 332                         'page' => null,
 333                         'subcat' => null,
 334                         'file' => null,
 335                 );
 336                 $this->flip = array( 'page' => false, 'subcat' => false, 'file' => false );
 337
 338                 foreach ( array( 'page', 'subcat', 'file' ) as $type ) {
 339                         # Get the sortkeys for start/end, if applicable.  Note that if
 340                         # the collation in the database differs from the one
 341                         # set in $wgCategoryCollation, pagination might go totally haywire.
 342                         $extraConds = array( 'cl_type' => $type );
 343                         if ( $this->from[$type] !== null ) {
 344                                 $extraConds[] = 'cl_sortkey >= '
 345                                         . $dbr->addQuotes( $this->collation->getSortKey( $this->from[$type] ) );
 346                         } elseif ( $this->until[$type] !== null ) {
 347                                 $extraConds[] = 'cl_sortkey < '
 348                                         . $dbr->addQuotes( $this->collation->getSortKey( $this->until[$type] ) );
 349                                 $this->flip[$type] = true;
 350                         }
 351
 352                         $res = $dbr->select(
 353                                 array( 'page', 'categorylinks', 'category' ),
 354                                 array( 'page_id', 'page_title', 'page_namespace', 'page_len',
 355                                         'page_is_redirect', 'cl_sortkey', 'cat_id', 'cat_title',
 356                                         'cat_subcats', 'cat_pages', 'cat_files',
 357                                         'cl_sortkey_prefix', 'cl_collation' ),
 358                                 array_merge( array( 'cl_to' => $this->title->getDBkey() ),  $extraConds ),
 359                                 __METHOD__,
 360                                 array(
 361                                         'USE INDEX' => array( 'categorylinks' => 'cl_sortkey' ),
 362                                         'LIMIT' => $this->limit + 1,
 363                                         'ORDER BY' => $this->flip[$type] ? 'cl_sortkey DESC' : 'cl_sortkey',
 364                                 ),
 365                                 array(
 366                                         'categorylinks'  => array( 'INNER JOIN', 'cl_from = page_id' ),
 367                                         'category' => array( 'LEFT JOIN', 'cat_title = page_title AND page_namespace = ' . NS_CATEGORY )
 368                                 )
 369                         );
 370
 371                         $count = 0;
 372                         foreach ( $res as $row ) {
 373                                 $title = Title::newFromRow( $row );
 374                                 if ( $row->cl_collation === '' ) {
 375                                         // Hack to make sure that while updating from 1.16 schema
 376                                         // and db is inconsistent, that the sky doesn't fall.
 377                                         // See r83544. Could perhaps be removed in a couple decades...
 378                                         $humanSortkey = $row->cl_sortkey;
 379                                 } else {
 380                                         $humanSortkey = $title->getCategorySortkey( $row->cl_sortkey_prefix );
 381                                 }
 382
 383                                 if ( ++$count > $this->limit ) {
 384                                         # We've reached the one extra which shows that there
 385                                         # are additional pages to be had. Stop here...
 386                                         $this->nextPage[$type] = $humanSortkey;
 387                                         break;
 388                                 }
 389
 390                                 if ( $title->getNamespace() == NS_CATEGORY ) {
 391                                         $cat = Category::newFromRow( $row, $title );
 392                                         $this->addSubcategoryObject( $cat, $humanSortkey, $row->page_len );
 393                                 } elseif ( $title->getNamespace() == NS_FILE ) {
 394                                         $this->addImage( $title, $humanSortkey, $row->page_len, $row->page_is_redirect );
 395                                 } else {
 396                                         $this->addPage( $title, $humanSortkey, $row->page_len, $row->page_is_redirect );
 397                                 }
 398                         }
 399                 }
 400         }
 401
 402         function getCategoryTop() {
 403                 $r = $this->getCategoryBottom();
 404                 return $r === ''
 405                         ? $r
 406                         : "<br style=\"clear:both;\"/>\n" . $r;
 407         }
 408
 409         function getSubcategorySection() {
 410                 # Don't show subcategories section if there are none.
 411                 $r = '';
 412                 $rescnt = count( $this->children );
 413                 $dbcnt = $this->cat->getSubcatCount();
 414                 $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'subcat' );
 415
 416                 if ( $rescnt > 0 ) {
 417                         # Showing subcategories
 418                         $r .= "<div id=\"mw-subcategories\">\n";
 419                         $r .= '<h2>' . wfMsg( 'subcategories' ) . "</h2>\n";
 420                         $r .= $countmsg;
 421                         $r .= $this->getSectionPagingLinks( 'subcat' );
 422                         $r .= $this->formatList( $this->children, $this->children_start_char );
 423                         $r .= $this->getSectionPagingLinks( 'subcat' );
 424                         $r .= "\n</div>";
 425                 }
 426                 return $r;
 427         }
 428
 429         function getPagesSection() {
 430                 $ti = htmlspecialchars( $this->title->getText() );
 431                 # Don't show articles section if there are none.
 432                 $r = '';
 433
 434                 # @todo FIXME: Here and in the other two sections: we don't need to bother
 435                 # with this rigamarole if the entire category contents fit on one page
 436                 # and have already been retrieved.  We can just use $rescnt in that
 437                 # case and save a query and some logic.
 438                 $dbcnt = $this->cat->getPageCount() - $this->cat->getSubcatCount()
 439                         - $this->cat->getFileCount();
 440                 $rescnt = count( $this->articles );
 441                 $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'article' );
 442
 443                 if ( $rescnt > 0 ) {
 444                         $r = "<div id=\"mw-pages\">\n";
 445                         $r .= '<h2>' . wfMsg( 'category_header', $ti ) . "</h2>\n";
 446                         $r .= $countmsg;
 447                         $r .= $this->getSectionPagingLinks( 'page' );
 448                         $r .= $this->formatList( $this->articles, $this->articles_start_char );
 449                         $r .= $this->getSectionPagingLinks( 'page' );
 450                         $r .= "\n</div>";
 451                 }
 452                 return $r;
 453         }
 454
 455         function getImageSection() {
 456                 $r = '';
 457                 $rescnt = $this->showGallery ? $this->gallery->count() : count( $this->imgsNoGallery );
 458                 if ( $rescnt > 0 ) {
 459                         $dbcnt = $this->cat->getFileCount();
 460                         $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'file' );
 461
 462                         $r .= "<div id=\"mw-category-media\">\n";
 463                         $r .= '<h2>' . wfMsg( 'category-media-header', htmlspecialchars( $this->title->getText() ) ) . "</h2>\n";
 464                         $r .= $countmsg;
 465                         $r .= $this->getSectionPagingLinks( 'file' );
 466                         if ( $this->showGallery ) {
 467                                 $r .= $this->gallery->toHTML();
 468                         } else {
 469                                 $r .= $this->formatList( $this->imgsNoGallery, $this->imgsNoGallery_start_char );
 470                         }
 471                         $r .= $this->getSectionPagingLinks( 'file' );
 472                         $r .= "\n</div>";
 473                 }
 474                 return $r;
 475         }
 476
 477         /**
 478          * Get the paging links for a section (subcats/pages/files), to go at the top and bottom
 479          * of the output.
 480          *
 481          * @param $type String: 'page', 'subcat', or 'file'
 482          * @return String: HTML output, possibly empty if there are no other pages
 483          */
 484         private function getSectionPagingLinks( $type ) {
 485                 if ( $this->until[$type] !== null ) {
 486                         return $this->pagingLinks( $this->nextPage[$type], $this->until[$type], $type );
 487                 } elseif ( $this->nextPage[$type] !== null || $this->from[$type] !== null ) {
 488                         return $this->pagingLinks( $this->from[$type], $this->nextPage[$type], $type );
 489                 } else {
 490                         return '';
 491                 }
 492         }
 493
 494         function getCategoryBottom() {
 495                 return '';
 496         }
 497
 498         /**
 499          * Format a list of articles chunked by letter, either as a
 500          * bullet list or a columnar format, depending on the length.
 501          *
 502          * @param $articles Array
 503          * @param $articles_start_char Array
 504          * @param $cutoff Int
 505          * @return String
 506          * @private
 507          */
 508         function formatList( $articles, $articles_start_char, $cutoff = 6 ) {
 509                 $list = '';
 510                 if ( count ( $articles ) > $cutoff ) {
 511                         $list = self::columnList( $articles, $articles_start_char );
 512                 } elseif ( count( $articles ) > 0 ) {
 513                         // for short lists of articles in categories.
 514                         $list = self::shortList( $articles, $articles_start_char );
 515                 }
 516                 global $wgBetterDirectionality, $wgTitle;
 517                 if( $wgBetterDirectionality ) {
 518                         $pageLang = $wgTitle->getPageLanguage();
 519                         $attribs = array( 'lang' => $pageLang->getCode(), 'dir' => $pageLang->getDir() );
 520                         $list = Html::rawElement( 'div', $attribs, $list );
 521                 }
 522
 523                 return $list;
 524         }
 525
 526         /**
 527          * Format a list of articles chunked by letter in a three-column
 528          * list, ordered vertically.
 529          *
 530          * TODO: Take the headers into account when creating columns, so they're
 531          * more visually equal.
 532          *
 533          * More distant TODO: Scrap this and use CSS columns, whenever IE finally
 534          * supports those.
 535          *
 536          * @param $articles Array
 537          * @param $articles_start_char Array
 538          * @return String
 539          * @private
 540          */
 541         static function columnList( $articles, $articles_start_char ) {
 542                 $columns = array_combine( $articles, $articles_start_char );
 543                 # Split into three columns
 544                 $columns = array_chunk( $columns, ceil( count( $columns ) / 3 ), true /* preserve keys */ );
 545
 546                 $ret = '<table width="100%"><tr valign="top"><td>';
 547                 $prevchar = null;
 548
 549                 foreach ( $columns as $column ) {
 550                         $colContents = array();
 551
 552                         # Kind of like array_flip() here, but we keep duplicates in an
 553                         # array instead of dropping them.
 554                         foreach ( $column as $article => $char ) {
 555                                 if ( !isset( $colContents[$char] ) ) {
 556                                         $colContents[$char] = array();
 557                                 }
 558                                 $colContents[$char][] = $article;
 559                         }
 560
 561                         $first = true;
 562                         foreach ( $colContents as $char => $articles ) {
 563                                 $ret .= '<h3>' . htmlspecialchars( $char );
 564                                 if ( $first && $char === $prevchar ) {
 565                                         # We're continuing a previous chunk at the top of a new
 566                                         # column, so add " cont." after the letter.
 567                                         $ret .= ' ' . wfMsgHtml( 'listingcontinuesabbrev' );
 568                                 }
 569                                 $ret .= "</h3>\n";
 570
 571                                 $ret .= '<ul><li>';
 572                                 $ret .= implode( "</li>\n<li>", $articles );
 573                                 $ret .= '</li></ul>';
 574
 575                                 $first = false;
 576                                 $prevchar = $char;
 577                         }
 578
 579                         $ret .= "</td>\n<td>";
 580                 }
 581
 582                 $ret .= '</td></tr></table>';
 583                 return $ret;
 584         }
 585
 586         /**
 587          * Format a list of articles chunked by letter in a bullet list.
 588          * @param $articles Array
 589          * @param $articles_start_char Array
 590          * @return String
 591          * @private
 592          */
 593         static function shortList( $articles, $articles_start_char ) {
 594                 $r = '<h3>' . htmlspecialchars( $articles_start_char[0] ) . "</h3>\n";
 595                 $r .= '<ul><li>' . $articles[0] . '</li>';
 596                 for ( $index = 1; $index < count( $articles ); $index++ ) {
 597                         if ( $articles_start_char[$index] != $articles_start_char[$index - 1] ) {
 598                                 $r .= "</ul><h3>" . htmlspecialchars( $articles_start_char[$index] ) . "</h3>\n<ul>";
 599                         }
 600
 601                         $r .= "<li>{$articles[$index]}</li>";
 602                 }
 603                 $r .= '</ul>';
 604                 return $r;
 605         }
 606
 607         /**
 608          * Create paging links, as a helper method to getSectionPagingLinks().
 609          *
 610          * @param $first String The 'until' parameter for the generated URL
 611          * @param $last String The 'from' parameter for the genererated URL
 612          * @param $type String A prefix for parameters, 'page' or 'subcat' or
 613          *     'file'
 614          * @return String HTML
 615          */
 616         private function pagingLinks( $first, $last, $type = '' ) {
 617                 global $wgLang;
 618                 $sk = $this->getSkin();
 619                 $limitText = $wgLang->formatNum( $this->limit );
 620
 621                 $prevLink = wfMsgExt( 'prevn', array( 'escape', 'parsemag' ), $limitText );
 622
 623                 if ( $first != '' ) {
 624                         $prevQuery = $this->query;
 625                         $prevQuery["{$type}until"] = $first;
 626                         unset( $prevQuery["{$type}from"] );
 627                         $prevLink = $sk->linkKnown(
 628                                 $this->title,
 629                                 $prevLink,
 630                                 array(),
 631                                 $prevQuery
 632                         );
 633                 }
 634
 635                 $nextLink = wfMsgExt( 'nextn', array( 'escape', 'parsemag' ), $limitText );
 636
 637                 if ( $last != '' ) {
 638                         $lastQuery = $this->query;
 639                         $lastQuery["{$type}from"] = $last;
 640                         unset( $lastQuery["{$type}until"] );
 641                         $nextLink = $sk->linkKnown(
 642                                 $this->title,
 643                                 $nextLink,
 644                                 array(),
 645                                 $lastQuery
 646                         );
 647                 }
 648
 649                 return "($prevLink) ($nextLink)";
 650         }
 651
 652         /**
 653          * What to do if the category table conflicts with the number of results
 654          * returned?  This function says what. Each type is considered independently
 655          * of the other types.
 656          *
 657          * Note for grepping: uses the messages category-article-count,
 658          * category-article-count-limited, category-subcat-count,
 659          * category-subcat-count-limited, category-file-count,
 660          * category-file-count-limited.
 661          *
 662          * @param $rescnt Int: The number of items returned by our database query.
 663          * @param $dbcnt Int: The number of items according to the category table.
 664          * @param $type String: 'subcat', 'article', or 'file'
 665          * @return String: A message giving the number of items, to output to HTML.
 666          */
 667         private function getCountMessage( $rescnt, $dbcnt, $type ) {
 668                 global $wgLang;
 669                 # There are three cases:
 670                 #   1) The category table figure seems sane.  It might be wrong, but
 671                 #      we can't do anything about it if we don't recalculate it on ev-
 672                 #      ery category view.
 673                 #   2) The category table figure isn't sane, like it's smaller than the
 674                 #      number of actual results, *but* the number of results is less
 675                 #      than $this->limit and there's no offset.  In this case we still
 676                 #      know the right figure.
 677                 #   3) We have no idea.
 678
 679                 # Check if there's a "from" or "until" for anything
 680
 681                 // This is a little ugly, but we seem to use different names
 682                 // for the paging types then for the messages.
 683                 if ( $type === 'article' ) {
 684                         $pagingType = 'page';
 685                 } else {
 686                         $pagingType = $type;
 687                 }
 688
 689                 $fromOrUntil = false;
 690                 if ( $this->from[$pagingType] !== null || $this->until[$pagingType] !== null ) {
 691                         $fromOrUntil = true;
 692                 }
 693
 694                 if ( $dbcnt == $rescnt || ( ( $rescnt == $this->limit || $fromOrUntil )
 695                         && $dbcnt > $rescnt ) ) {
 696                         # Case 1: seems sane.
 697                         $totalcnt = $dbcnt;
 698                 } elseif ( $rescnt < $this->limit && !$fromOrUntil ) {
 699                         # Case 2: not sane, but salvageable.  Use the number of results.
 700                         # Since there are fewer than 200, we can also take this opportunity
 701                         # to refresh the incorrect category table entry -- which should be
 702                         # quick due to the small number of entries.
 703                         $totalcnt = $rescnt;
 704                         $this->cat->refreshCounts();
 705                 } else {
 706                         # Case 3: hopeless.  Don't give a total count at all.
 707                         return wfMsgExt( "category-$type-count-limited", 'parse',
 708                                 $wgLang->formatNum( $rescnt ) );
 709                 }
 710                 return wfMsgExt(
 711                         "category-$type-count",
 712                         'parse',
 713                         $wgLang->formatNum( $rescnt ),
 714                         $wgLang->formatNum( $totalcnt )
 715                 );
 716         }
 717 }