includes/CategoryPage.php

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