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