includes/CategoryViewer.php

   1 <?php
   2 /**
   3  * List and paging of category members.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 class CategoryViewer extends ContextSource {
  24         /** @var int */
  25         public $limit;
  26
  27         /** @var array */
  28         public $from;
  29
  30         /** @var array */
  31         public $until;
  32
  33         /** @var string[] */
  34         public $articles;
  35
  36         /** @var array */
  37         public $articles_start_char;
  38
  39         /** @var array */
  40         public $children;
  41
  42         /** @var array */
  43         public $children_start_char;
  44
  45         /** @var bool */
  46         public $showGallery;
  47
  48         /** @var array */
  49         public $imgsNoGallery_start_char;
  50
  51         /** @var array */
  52         public $imgsNoGallery;
  53
  54         /** @var array */
  55         public $nextPage;
  56
  57         /** @var array */
  58         protected $prevPage;
  59
  60         /** @var array */
  61         public $flip;
  62
  63         /** @var Title */
  64         public $title;
  65
  66         /** @var Collation */
  67         public $collation;
  68
  69         /** @var ImageGallery */
  70         public $gallery;
  71
  72         /** @var Category Category object for this page. */
  73         private $cat;
  74
  75         /** @var array The original query array, to be used in generating paging links. */
  76         private $query;
  77
  78         /**
  79          * @since 1.19 $context is a second, required parameter
  80          * @param Title $title
  81          * @param IContextSource $context
  82          * @param array $from An array with keys page, subcat,
  83          *        and file for offset of results of each section (since 1.17)
  84          * @param array $until An array with 3 keys for until of each section (since 1.17)
  85          * @param array $query
  86          */
  87         function __construct( $title, IContextSource $context, $from = array(),
  88                 $until = array(), $query = array()
  89         ) {
  90                 $this->title = $title;
  91                 $this->setContext( $context );
  92                 $this->from = $from;
  93                 $this->until = $until;
  94                 $this->limit = $context->getConfig()->get( 'CategoryPagingLimit' );
  95                 $this->cat = Category::newFromTitle( $title );
  96                 $this->query = $query;
  97                 $this->collation = Collation::singleton();
  98                 unset( $this->query['title'] );
  99         }
 100
 101         /**
 102          * Format the category data list.
 103          *
 104          * @return string HTML output
 105          */
 106         public function getHTML() {
 107
 108                 $this->showGallery = $this->getConfig()->get( 'CategoryMagicGallery' )
 109                         && !$this->getOutput()->mNoGallery;
 110
 111                 $this->clearCategoryState();
 112                 $this->doCategoryQuery();
 113                 $this->finaliseCategoryState();
 114
 115                 $r = $this->getSubcategorySection() .
 116                         $this->getPagesSection() .
 117                         $this->getImageSection();
 118
 119                 if ( $r == '' ) {
 120                         // If there is no category content to display, only
 121                         // show the top part of the navigation links.
 122                         // @todo FIXME: Cannot be completely suppressed because it
 123                         //        is unknown if 'until' or 'from' makes this
 124                         //        give 0 results.
 125                         $r = $r . $this->getCategoryTop();
 126                 } else {
 127                         $r = $this->getCategoryTop() .
 128                                 $r .
 129                                 $this->getCategoryBottom();
 130                 }
 131
 132                 // Give a proper message if category is empty
 133                 if ( $r == '' ) {
 134                         $r = $this->msg( 'category-empty' )->parseAsBlock();
 135                 }
 136
 137                 $lang = $this->getLanguage();
 138                 $langAttribs = array( 'lang' => $lang->getHtmlCode(), 'dir' => $lang->getDir() );
 139                 # put a div around the headings which are in the user language
 140                 $r = Html::openElement( 'div', $langAttribs ) . $r . '</div>';
 141
 142                 return $r;
 143         }
 144
 145         function clearCategoryState() {
 146                 $this->articles = array();
 147                 $this->articles_start_char = array();
 148                 $this->children = array();
 149                 $this->children_start_char = array();
 150                 if ( $this->showGallery ) {
 151                         // Note that null for mode is taken to mean use default.
 152                         $mode = $this->getRequest()->getVal( 'gallerymode', null );
 153                         try {
 154                                 $this->gallery = ImageGalleryBase::factory( $mode, $this->getContext() );
 155                         } catch ( Exception $e ) {
 156                                 // User specified something invalid, fallback to default.
 157                                 $this->gallery = ImageGalleryBase::factory( false, $this->getContext() );
 158                         }
 159
 160                         $this->gallery->setHideBadImages();
 161                 } else {
 162                         $this->imgsNoGallery = array();
 163                         $this->imgsNoGallery_start_char = array();
 164                 }
 165         }
 166
 167         /**
 168          * Add a subcategory to the internal lists, using a Category object
 169          * @param Category $cat
 170          * @param string $sortkey
 171          * @param int $pageLength
 172          */
 173         function addSubcategoryObject( Category $cat, $sortkey, $pageLength ) {
 174                 // Subcategory; strip the 'Category' namespace from the link text.
 175                 $title = $cat->getTitle();
 176
 177                 $link = Linker::link( $title, htmlspecialchars( $title->getText() ) );
 178                 if ( $title->isRedirect() ) {
 179                         // This didn't used to add redirect-in-category, but might
 180                         // as well be consistent with the rest of the sections
 181                         // on a category page.
 182                         $link = '<span class="redirect-in-category">' . $link . '</span>';
 183                 }
 184                 $this->children[] = $link;
 185
 186                 $this->children_start_char[] =
 187                         $this->getSubcategorySortChar( $cat->getTitle(), $sortkey );
 188         }
 189
 190         /**
 191          * Get the character to be used for sorting subcategories.
 192          * If there's a link from Category:A to Category:B, the sortkey of the resulting
 193          * entry in the categorylinks table is Category:A, not A, which it SHOULD be.
 194          * Workaround: If sortkey == "Category:".$title, than use $title for sorting,
 195          * else use sortkey...
 196          *
 197          * @param Title $title
 198          * @param string $sortkey The human-readable sortkey (before transforming to icu or whatever).
 199          * @return string
 200          */
 201         function getSubcategorySortChar( $title, $sortkey ) {
 202                 global $wgContLang;
 203
 204                 if ( $title->getPrefixedText() == $sortkey ) {
 205                         $word = $title->getDBkey();
 206                 } else {
 207                         $word = $sortkey;
 208                 }
 209
 210                 $firstChar = $this->collation->getFirstLetter( $word );
 211
 212                 return $wgContLang->convert( $firstChar );
 213         }
 214
 215         /**
 216          * Add a page in the image namespace
 217          * @param Title $title
 218          * @param string $sortkey
 219          * @param int $pageLength
 220          * @param bool $isRedirect
 221          */
 222         function addImage( Title $title, $sortkey, $pageLength, $isRedirect = false ) {
 223                 global $wgContLang;
 224                 if ( $this->showGallery ) {
 225                         $flip = $this->flip['file'];
 226                         if ( $flip ) {
 227                                 $this->gallery->insert( $title );
 228                         } else {
 229                                 $this->gallery->add( $title );
 230                         }
 231                 } else {
 232                         $link = Linker::link( $title );
 233                         if ( $isRedirect ) {
 234                                 // This seems kind of pointless given 'mw-redirect' class,
 235                                 // but keeping for back-compatibility with user css.
 236                                 $link = '<span class="redirect-in-category">' . $link . '</span>';
 237                         }
 238                         $this->imgsNoGallery[] = $link;
 239
 240                         $this->imgsNoGallery_start_char[] = $wgContLang->convert(
 241                                 $this->collation->getFirstLetter( $sortkey ) );
 242                 }
 243         }
 244
 245         /**
 246          * Add a miscellaneous page
 247          * @param Title $title
 248          * @param string $sortkey
 249          * @param int $pageLength
 250          * @param bool $isRedirect
 251          */
 252         function addPage( $title, $sortkey, $pageLength, $isRedirect = false ) {
 253                 global $wgContLang;
 254
 255                 $link = Linker::link( $title );
 256                 if ( $isRedirect ) {
 257                         // This seems kind of pointless given 'mw-redirect' class,
 258                         // but keeping for back-compatibility with user css.
 259                         $link = '<span class="redirect-in-category">' . $link . '</span>';
 260                 }
 261                 $this->articles[] = $link;
 262
 263                 $this->articles_start_char[] = $wgContLang->convert(
 264                         $this->collation->getFirstLetter( $sortkey ) );
 265         }
 266
 267         function finaliseCategoryState() {
 268                 if ( $this->flip['subcat'] ) {
 269                         $this->children = array_reverse( $this->children );
 270                         $this->children_start_char = array_reverse( $this->children_start_char );
 271                 }
 272                 if ( $this->flip['page'] ) {
 273                         $this->articles = array_reverse( $this->articles );
 274                         $this->articles_start_char = array_reverse( $this->articles_start_char );
 275                 }
 276                 if ( !$this->showGallery && $this->flip['file'] ) {
 277                         $this->imgsNoGallery = array_reverse( $this->imgsNoGallery );
 278                         $this->imgsNoGallery_start_char = array_reverse( $this->imgsNoGallery_start_char );
 279                 }
 280         }
 281
 282         function doCategoryQuery() {
 283                 $dbr = wfGetDB( DB_SLAVE, 'category' );
 284
 285                 $this->nextPage = array(
 286                         'page' => null,
 287                         'subcat' => null,
 288                         'file' => null,
 289                 );
 290                 $this->prevPage = array(
 291                         'page' => null,
 292                         'subcat' => null,
 293                         'file' => null,
 294                 );
 295
 296                 $this->flip = array( 'page' => false, 'subcat' => false, 'file' => false );
 297
 298                 foreach ( array( 'page', 'subcat', 'file' ) as $type ) {
 299                         # Get the sortkeys for start/end, if applicable.  Note that if
 300                         # the collation in the database differs from the one
 301                         # set in $wgCategoryCollation, pagination might go totally haywire.
 302                         $extraConds = array( 'cl_type' => $type );
 303                         if ( isset( $this->from[$type] ) && $this->from[$type] !== null ) {
 304                                 $extraConds[] = 'cl_sortkey >= '
 305                                         . $dbr->addQuotes( $this->collation->getSortKey( $this->from[$type] ) );
 306                         } elseif ( isset( $this->until[$type] ) && $this->until[$type] !== null ) {
 307                                 $extraConds[] = 'cl_sortkey < '
 308                                         . $dbr->addQuotes( $this->collation->getSortKey( $this->until[$type] ) );
 309                                 $this->flip[$type] = true;
 310                         }
 311
 312                         $res = $dbr->select(
 313                                 array( 'page', 'categorylinks', 'category' ),
 314                                 array( 'page_id', 'page_title', 'page_namespace', 'page_len',
 315                                         'page_is_redirect', 'cl_sortkey', 'cat_id', 'cat_title',
 316                                         'cat_subcats', 'cat_pages', 'cat_files',
 317                                         'cl_sortkey_prefix', 'cl_collation' ),
 318                                 array_merge( array( 'cl_to' => $this->title->getDBkey() ), $extraConds ),
 319                                 __METHOD__,
 320                                 array(
 321                                         'USE INDEX' => array( 'categorylinks' => 'cl_sortkey' ),
 322                                         'LIMIT' => $this->limit + 1,
 323                                         'ORDER BY' => $this->flip[$type] ? 'cl_sortkey DESC' : 'cl_sortkey',
 324                                 ),
 325                                 array(
 326                                         'categorylinks' => array( 'INNER JOIN', 'cl_from = page_id' ),
 327                                         'category' => array( 'LEFT JOIN', array(
 328                                                 'cat_title = page_title',
 329                                                 'page_namespace' => NS_CATEGORY
 330                                         ))
 331                                 )
 332                         );
 333
 334                         $count = 0;
 335                         foreach ( $res as $row ) {
 336                                 $title = Title::newFromRow( $row );
 337                                 if ( $row->cl_collation === '' ) {
 338                                         // Hack to make sure that while updating from 1.16 schema
 339                                         // and db is inconsistent, that the sky doesn't fall.
 340                                         // See r83544. Could perhaps be removed in a couple decades...
 341                                         $humanSortkey = $row->cl_sortkey;
 342                                 } else {
 343                                         $humanSortkey = $title->getCategorySortkey( $row->cl_sortkey_prefix );
 344                                 }
 345
 346                                 if ( ++$count > $this->limit ) {
 347                                         # We've reached the one extra which shows that there
 348                                         # are additional pages to be had. Stop here...
 349                                         $this->nextPage[$type] = $humanSortkey;
 350                                         break;
 351                                 }
 352                                 if ( $count == $this->limit ) {
 353                                         $this->prevPage[$type] = $humanSortkey;
 354                                 }
 355
 356                                 if ( $title->getNamespace() == NS_CATEGORY ) {
 357                                         $cat = Category::newFromRow( $row, $title );
 358                                         $this->addSubcategoryObject( $cat, $humanSortkey, $row->page_len );
 359                                 } elseif ( $title->getNamespace() == NS_FILE ) {
 360                                         $this->addImage( $title, $humanSortkey, $row->page_len, $row->page_is_redirect );
 361                                 } else {
 362                                         $this->addPage( $title, $humanSortkey, $row->page_len, $row->page_is_redirect );
 363                                 }
 364                         }
 365                 }
 366         }
 367
 368         /**
 369          * @return string
 370          */
 371         function getCategoryTop() {
 372                 $r = $this->getCategoryBottom();
 373                 return $r === ''
 374                         ? $r
 375                         : "<br style=\"clear:both;\"/>\n" . $r;
 376         }
 377
 378         /**
 379          * @return string
 380          */
 381         function getSubcategorySection() {
 382                 # Don't show subcategories section if there are none.
 383                 $r = '';
 384                 $rescnt = count( $this->children );
 385                 $dbcnt = $this->cat->getSubcatCount();
 386                 $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'subcat' );
 387
 388                 if ( $rescnt > 0 ) {
 389                         # Showing subcategories
 390                         $r .= "<div id=\"mw-subcategories\">\n";
 391                         $r .= '<h2>' . $this->msg( 'subcategories' )->parse() . "</h2>\n";
 392                         $r .= $countmsg;
 393                         $r .= $this->getSectionPagingLinks( 'subcat' );
 394                         $r .= $this->formatList( $this->children, $this->children_start_char );
 395                         $r .= $this->getSectionPagingLinks( 'subcat' );
 396                         $r .= "\n</div>";
 397                 }
 398                 return $r;
 399         }
 400
 401         /**
 402          * @return string
 403          */
 404         function getPagesSection() {
 405                 $ti = wfEscapeWikiText( $this->title->getText() );
 406                 # Don't show articles section if there are none.
 407                 $r = '';
 408
 409                 # @todo FIXME: Here and in the other two sections: we don't need to bother
 410                 # with this rigmarole if the entire category contents fit on one page
 411                 # and have already been retrieved.  We can just use $rescnt in that
 412                 # case and save a query and some logic.
 413                 $dbcnt = $this->cat->getPageCount() - $this->cat->getSubcatCount()
 414                         - $this->cat->getFileCount();
 415                 $rescnt = count( $this->articles );
 416                 $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'article' );
 417
 418                 if ( $rescnt > 0 ) {
 419                         $r = "<div id=\"mw-pages\">\n";
 420                         $r .= '<h2>' . $this->msg( 'category_header', $ti )->parse() . "</h2>\n";
 421                         $r .= $countmsg;
 422                         $r .= $this->getSectionPagingLinks( 'page' );
 423                         $r .= $this->formatList( $this->articles, $this->articles_start_char );
 424                         $r .= $this->getSectionPagingLinks( 'page' );
 425                         $r .= "\n</div>";
 426                 }
 427                 return $r;
 428         }
 429
 430         /**
 431          * @return string
 432          */
 433         function getImageSection() {
 434                 $r = '';
 435                 $rescnt = $this->showGallery ? $this->gallery->count() : count( $this->imgsNoGallery );
 436                 if ( $rescnt > 0 ) {
 437                         $dbcnt = $this->cat->getFileCount();
 438                         $countmsg = $this->getCountMessage( $rescnt, $dbcnt, 'file' );
 439
 440                         $r .= "<div id=\"mw-category-media\">\n";
 441                         $r .= '<h2>' .
 442                                 $this->msg(
 443                                         'category-media-header',
 444                                         wfEscapeWikiText( $this->title->getText() )
 445                                 )->text() .
 446                                 "</h2>\n";
 447                         $r .= $countmsg;
 448                         $r .= $this->getSectionPagingLinks( 'file' );
 449                         if ( $this->showGallery ) {
 450                                 $r .= $this->gallery->toHTML();
 451                         } else {
 452                                 $r .= $this->formatList( $this->imgsNoGallery, $this->imgsNoGallery_start_char );
 453                         }
 454                         $r .= $this->getSectionPagingLinks( 'file' );
 455                         $r .= "\n</div>";
 456                 }
 457                 return $r;
 458         }
 459
 460         /**
 461          * Get the paging links for a section (subcats/pages/files), to go at the top and bottom
 462          * of the output.
 463          *
 464          * @param string $type 'page', 'subcat', or 'file'
 465          * @return string HTML output, possibly empty if there are no other pages
 466          */
 467         private function getSectionPagingLinks( $type ) {
 468                 if ( isset( $this->until[$type] ) && $this->until[$type] !== null ) {
 469                         // The new value for the until parameter should be pointing to the first
 470                         // result displayed on the page which is the second last result retrieved
 471                         // from the database.The next link should have a from parameter pointing
 472                         // to the until parameter of the current page.
 473                         if ( $this->nextPage[$type] !== null ) {
 474                                 return $this->pagingLinks( $this->prevPage[$type], $this->until[$type], $type );
 475                         } else {
 476                                 // If the nextPage variable is null, it means that we have reached the first page
 477                                 // and therefore the previous link should be disabled.
 478                                 return $this->pagingLinks( null, $this->until[$type], $type );
 479                         }
 480                 } elseif ( $this->nextPage[$type] !== null
 481                         || ( isset( $this->from[$type] ) && $this->from[$type] !== null )
 482                 ) {
 483                         return $this->pagingLinks( $this->from[$type], $this->nextPage[$type], $type );
 484                 } else {
 485                         return '';
 486                 }
 487         }
 488
 489         /**
 490          * @return string
 491          */
 492         function getCategoryBottom() {
 493                 return '';
 494         }
 495
 496         /**
 497          * Format a list of articles chunked by letter, either as a
 498          * bullet list or a columnar format, depending on the length.
 499          *
 500          * @param array $articles
 501          * @param array $articles_start_char
 502          * @param int $cutoff
 503          * @return string
 504          * @private
 505          */
 506         function formatList( $articles, $articles_start_char, $cutoff = 6 ) {
 507                 $list = '';
 508                 if ( count( $articles ) > $cutoff ) {
 509                         $list = self::columnList( $articles, $articles_start_char );
 510                 } elseif ( count( $articles ) > 0 ) {
 511                         // for short lists of articles in categories.
 512                         $list = self::shortList( $articles, $articles_start_char );
 513                 }
 514
 515                 $pageLang = $this->title->getPageLanguage();
 516                 $attribs = array( 'lang' => $pageLang->getHtmlCode(), 'dir' => $pageLang->getDir(),
 517                         'class' => 'mw-content-' . $pageLang->getDir() );
 518                 $list = Html::rawElement( 'div', $attribs, $list );
 519
 520                 return $list;
 521         }
 522
 523         /**
 524          * Format a list of articles chunked by letter in a three-column
 525          * list, ordered vertically.
 526          *
 527          * TODO: Take the headers into account when creating columns, so they're
 528          * more visually equal.
 529          *
 530          * More distant TODO: Scrap this and use CSS columns, whenever IE finally
 531          * supports those.
 532          *
 533          * @param array $articles
 534          * @param string[] $articles_start_char
 535          * @return string
 536          * @private
 537          */
 538         static function columnList( $articles, $articles_start_char ) {
 539                 $columns = array_combine( $articles, $articles_start_char );
 540                 # Split into three columns
 541                 $columns = array_chunk( $columns, ceil( count( $columns ) / 3 ), true /* preserve keys */ );
 542
 543                 $ret = '<table style="width: 100%;"><tr style="vertical-align: top;">';
 544                 $prevchar = null;
 545
 546                 foreach ( $columns as $column ) {
 547                         $ret .= '<td style="width: 33.3%;">';
 548                         $colContents = array();
 549
 550                         # Kind of like array_flip() here, but we keep duplicates in an
 551                         # array instead of dropping them.
 552                         foreach ( $column as $article => $char ) {
 553                                 if ( !isset( $colContents[$char] ) ) {
 554                                         $colContents[$char] = array();
 555                                 }
 556                                 $colContents[$char][] = $article;
 557                         }
 558
 559                         $first = true;
 560                         foreach ( $colContents as $char => $articles ) {
 561                                 # Change space to non-breaking space to keep headers aligned
 562                                 $h3char = $char === ' ' ? '&#160;' : htmlspecialchars( $char );
 563
 564                                 $ret .= '<h3>' . $h3char;
 565                                 if ( $first && $char === $prevchar ) {
 566                                         # We're continuing a previous chunk at the top of a new
 567                                         # column, so add " cont." after the letter.
 568                                         $ret .= ' ' . wfMessage( 'listingcontinuesabbrev' )->escaped();
 569                                 }
 570                                 $ret .= "</h3>\n";
 571
 572                                 $ret .= '<ul><li>';
 573                                 $ret .= implode( "</li>\n<li>", $articles );
 574                                 $ret .= '</li></ul>';
 575
 576                                 $first = false;
 577                                 $prevchar = $char;
 578                         }
 579
 580                         $ret .= "</td>\n";
 581                 }
 582
 583                 $ret .= '</tr></table>';
 584                 return $ret;
 585         }
 586
 587         /**
 588          * Format a list of articles chunked by letter in a bullet list.
 589          * @param array $articles
 590          * @param string[] $articles_start_char
 591          * @return string
 592          * @private
 593          */
 594         static function shortList( $articles, $articles_start_char ) {
 595                 $r = '<h3>' . htmlspecialchars( $articles_start_char[0] ) . "</h3>\n";
 596                 $r .= '<ul><li>' . $articles[0] . '</li>';
 597                 $articleCount = count( $articles );
 598                 for ( $index = 1; $index < $articleCount; $index++ ) {
 599                         if ( $articles_start_char[$index] != $articles_start_char[$index - 1] ) {
 600                                 $r .= "</ul><h3>" . htmlspecialchars( $articles_start_char[$index] ) . "</h3>\n<ul>";
 601                         }
 602
 603                         $r .= "<li>{$articles[$index]}</li>";
 604                 }
 605                 $r .= '</ul>';
 606                 return $r;
 607         }
 608
 609         /**
 610          * Create paging links, as a helper method to getSectionPagingLinks().
 611          *
 612          * @param string $first The 'until' parameter for the generated URL
 613          * @param string $last The 'from' parameter for the generated URL
 614          * @param string $type A prefix for parameters, 'page' or 'subcat' or
 615          *     'file'
 616          * @return string HTML
 617          */
 618         private function pagingLinks( $first, $last, $type = '' ) {
 619                 $prevLink = $this->msg( 'prevn' )->numParams( $this->limit )->escaped();
 620
 621                 if ( $first != '' ) {
 622                         $prevQuery = $this->query;
 623                         $prevQuery["{$type}until"] = $first;
 624                         unset( $prevQuery["{$type}from"] );
 625                         $prevLink = Linker::linkKnown(
 626                                 $this->addFragmentToTitle( $this->title, $type ),
 627                                 $prevLink,
 628                                 array(),
 629                                 $prevQuery
 630                         );
 631                 }
 632
 633                 $nextLink = $this->msg( 'nextn' )->numParams( $this->limit )->escaped();
 634
 635                 if ( $last != '' ) {
 636                         $lastQuery = $this->query;
 637                         $lastQuery["{$type}from"] = $last;
 638                         unset( $lastQuery["{$type}until"] );
 639                         $nextLink = Linker::linkKnown(
 640                                 $this->addFragmentToTitle( $this->title, $type ),
 641                                 $nextLink,
 642                                 array(),
 643                                 $lastQuery
 644                         );
 645                 }
 646
 647                 return $this->msg( 'categoryviewer-pagedlinks' )->rawParams( $prevLink, $nextLink )->escaped();
 648         }
 649
 650         /**
 651          * Takes a title, and adds the fragment identifier that
 652          * corresponds to the correct segment of the category.
 653          *
 654          * @param Title $title The title (usually $this->title)
 655          * @param string $section Which section
 656          * @throws MWException
 657          * @return Title
 658          */
 659         private function addFragmentToTitle( $title, $section ) {
 660                 switch ( $section ) {
 661                         case 'page':
 662                                 $fragment = 'mw-pages';
 663                                 break;
 664                         case 'subcat':
 665                                 $fragment = 'mw-subcategories';
 666                                 break;
 667                         case 'file':
 668                                 $fragment = 'mw-category-media';
 669                                 break;
 670                         default:
 671                                 throw new MWException( __METHOD__ .
 672                                         " Invalid section $section." );
 673                 }
 674
 675                 return Title::makeTitle( $title->getNamespace(),
 676                         $title->getDBkey(), $fragment );
 677         }
 678
 679         /**
 680          * What to do if the category table conflicts with the number of results
 681          * returned?  This function says what. Each type is considered independently
 682          * of the other types.
 683          *
 684          * @param int $rescnt The number of items returned by our database query.
 685          * @param int $dbcnt The number of items according to the category table.
 686          * @param string $type 'subcat', 'article', or 'file'
 687          * @return string A message giving the number of items, to output to HTML.
 688          */
 689         private function getCountMessage( $rescnt, $dbcnt, $type ) {
 690                 // There are three cases:
 691                 //   1) The category table figure seems sane.  It might be wrong, but
 692                 //      we can't do anything about it if we don't recalculate it on ev-
 693                 //      ery category view.
 694                 //   2) The category table figure isn't sane, like it's smaller than the
 695                 //      number of actual results, *but* the number of results is less
 696                 //      than $this->limit and there's no offset.  In this case we still
 697                 //      know the right figure.
 698                 //   3) We have no idea.
 699
 700                 // Check if there's a "from" or "until" for anything
 701
 702                 // This is a little ugly, but we seem to use different names
 703                 // for the paging types then for the messages.
 704                 if ( $type === 'article' ) {
 705                         $pagingType = 'page';
 706                 } else {
 707                         $pagingType = $type;
 708                 }
 709
 710                 $fromOrUntil = false;
 711                 if ( ( isset( $this->from[$pagingType] ) && $this->from[$pagingType] !== null ) ||
 712                         ( isset( $this->until[$pagingType] ) && $this->until[$pagingType] !== null )
 713                 ) {
 714                         $fromOrUntil = true;
 715                 }
 716
 717                 if ( $dbcnt == $rescnt ||
 718                         ( ( $rescnt == $this->limit || $fromOrUntil ) && $dbcnt > $rescnt )
 719                 ) {
 720                         // Case 1: seems sane.
 721                         $totalcnt = $dbcnt;
 722                 } elseif ( $rescnt < $this->limit && !$fromOrUntil ) {
 723                         // Case 2: not sane, but salvageable.  Use the number of results.
 724                         // Since there are fewer than 200, we can also take this opportunity
 725                         // to refresh the incorrect category table entry -- which should be
 726                         // quick due to the small number of entries.
 727                         $totalcnt = $rescnt;
 728                         $category = $this->cat;
 729                         wfGetDB( DB_MASTER )->onTransactionIdle( function () use ( $category ) {
 730                                 $category->refreshCounts();
 731                         } );
 732                 } else {
 733                         // Case 3: hopeless.  Don't give a total count at all.
 734                         // Messages: category-subcat-count-limited, category-article-count-limited,
 735                         // category-file-count-limited
 736                         return $this->msg( "category-$type-count-limited" )->numParams( $rescnt )->parseAsBlock();
 737                 }
 738                 // Messages: category-subcat-count, category-article-count, category-file-count
 739                 return $this->msg( "category-$type-count" )->numParams( $rescnt, $totalcnt )->parseAsBlock();
 740         }
 741 }