includes/QueryPage.php

   1 <?php
   2 /**
   3  * Contain a class for special pages
   4  * @file
   5  * @ingroup SpecialPages
   6  */
   7
   8 /**
   9  * List of query page classes and their associated special pages,
  10  * for periodic updates.
  11  *
  12  * DO NOT CHANGE THIS LIST without testing that
  13  * maintenance/updateSpecialPages.php still works.
  14  */
  15 global $wgQueryPages; // not redundant
  16 $wgQueryPages = array(
  17 //         QueryPage subclass           Special page name         Limit (false for none, none for the default)
  18 // ----------------------------------------------------------------------------
  19         array( 'AncientPagesPage',              'Ancientpages'                  ),
  20         array( 'BrokenRedirectsPage',           'BrokenRedirects'               ),
  21         array( 'DeadendPagesPage',              'Deadendpages'                  ),
  22         array( 'DisambiguationsPage',           'Disambiguations'               ),
  23         array( 'DoubleRedirectsPage',           'DoubleRedirects'               ),
  24         array( 'FileDuplicateSearchPage',       'FileDuplicateSearch'           ),
  25         array( 'LinkSearchPage',                'LinkSearch'                    ),
  26         array( 'ListredirectsPage',             'Listredirects'                 ),
  27         array( 'LonelyPagesPage',               'Lonelypages'                   ),
  28         array( 'LongPagesPage',                 'Longpages'                     ),
  29         array( 'MIMEsearchPage',                'MIMEsearch'                    ),
  30         array( 'MostcategoriesPage',            'Mostcategories'                ),
  31         array( 'MostimagesPage',                'Mostimages'                    ),
  32         array( 'MostlinkedCategoriesPage',      'Mostlinkedcategories'          ),
  33         array( 'MostlinkedtemplatesPage',       'Mostlinkedtemplates'           ),
  34         array( 'MostlinkedPage',                'Mostlinked'                    ),
  35         array( 'MostrevisionsPage',             'Mostrevisions'                 ),
  36         array( 'FewestrevisionsPage',           'Fewestrevisions'               ),
  37         array( 'ShortPagesPage',                'Shortpages'                    ),
  38         array( 'UncategorizedCategoriesPage',   'Uncategorizedcategories'       ),
  39         array( 'UncategorizedPagesPage',        'Uncategorizedpages'            ),
  40         array( 'UncategorizedImagesPage',       'Uncategorizedimages'           ),
  41         array( 'UncategorizedTemplatesPage',    'Uncategorizedtemplates'        ),
  42         array( 'UnusedCategoriesPage',          'Unusedcategories'              ),
  43         array( 'UnusedimagesPage',              'Unusedimages'                  ),
  44         array( 'WantedCategoriesPage',          'Wantedcategories'              ),
  45         array( 'WantedFilesPage',               'Wantedfiles'                   ),
  46         array( 'WantedPagesPage',               'Wantedpages'                   ),
  47         array( 'WantedTemplatesPage',           'Wantedtemplates'               ),
  48         array( 'UnwatchedPagesPage',            'Unwatchedpages'                ),
  49         array( 'UnusedtemplatesPage',           'Unusedtemplates'               ),
  50         array( 'WithoutInterwikiPage',          'Withoutinterwiki'              ),
  51 );
  52 wfRunHooks( 'wgQueryPages', array( &$wgQueryPages ) );
  53
  54 global $wgDisableCounters;
  55 if ( !$wgDisableCounters )
  56         $wgQueryPages[] = array( 'PopularPagesPage', 'Popularpages' );
  57
  58
  59 /**
  60  * This is a class for doing query pages; since they're almost all the same,
  61  * we factor out some of the functionality into a superclass, and let
  62  * subclasses derive from it.
  63  * @ingroup SpecialPage
  64  */
  65 abstract class QueryPage extends SpecialPage {
  66         /**
  67          * Whether or not we want plain listoutput rather than an ordered list
  68          *
  69          * @var bool
  70          */
  71         var $listoutput = false;
  72
  73         /**
  74          * The offset and limit in use, as passed to the query() function
  75          *
  76          * @var integer
  77          */
  78         var $offset = 0;
  79         var $limit = 0;
  80
  81         /**
  82          * The number of rows returned by the query. Reading this variable
  83          * only makes sense in functions that are run after the query has been
  84          * done, such as preprocessResults() and formatRow().
  85          */
  86         protected $numRows;
  87
  88         /**
  89          * Wheter to show prev/next links
  90          */
  91         var $shownavigation = true;
  92
  93         /**
  94          * A mutator for $this->listoutput;
  95          *
  96          * @param $bool Boolean
  97          */
  98         function setListoutput( $bool ) {
  99                 $this->listoutput = $bool;
 100         }
 101
 102         /**
 103          * Return title object representing this page
 104          *
 105          * @return Title
 106          */
 107         function getTitle() {
 108                 return SpecialPage::getTitleFor( $this->getName() );
 109         }
 110
 111         /**
 112          * Subclasses return an SQL query here, formatted as an array with the
 113          * following keys:
 114          *    tables => Table(s) for passing to Database::select()
 115          *    fields => Field(s) for passing to Database::select(), may be *
 116          *    conds => WHERE conditions
 117          *    options => options
 118          *    join_conds => JOIN conditions
 119          *
 120          * Note that the query itself should return the following three columns:
 121          * 'namespace', 'title', and 'value'
 122          * *in that order*. 'value' is used for sorting.
 123          *
 124          * These may be stored in the querycache table for expensive queries,
 125          * and that cached data will be returned sometimes, so the presence of
 126          * extra fields can't be relied upon. The cached 'value' column will be
 127          * an integer; non-numeric values are useful only for sorting the
 128          * initial query (except if they're timestamps, see usesTimestamps()).
 129          *
 130          * Don't include an ORDER or LIMIT clause, they will be added.
 131          *
 132          * If this function is not overridden or returns something other than
 133          * an array, getSQL() will be used instead. This is for backwards
 134          * compatibility only and is strongly deprecated.
 135          * @return array
 136          * @since 1.18
 137          */
 138         function getQueryInfo() {
 139                 return null;
 140         }
 141
 142         /**
 143          * For back-compat, subclasses may return a raw SQL query here, as a string.
 144          * This is stronly deprecated; getQueryInfo() should be overridden instead.
 145          * @return string
 146          * @deprecated since 1.18
 147          */
 148         function getSQL() {
 149                 throw new MWException( "Bug in a QueryPage: doesn't implement getQueryInfo() nor getQuery() properly" );
 150         }
 151
 152         /**
 153          * Subclasses return an array of fields to order by here. Don't append
 154          * DESC to the field names, that'll be done automatically if
 155          * sortDescending() returns true.
 156          * @return array
 157          * @since 1.18
 158          */
 159         function getOrderFields() {
 160                 return array( 'value' );
 161         }
 162
 163         /**
 164          * Does this query return timestamps rather than integers in its
 165          * 'value' field? If true, this class will convert 'value' to a
 166          * UNIX timestamp for caching.
 167          * NOTE: formatRow() may get timestamps in TS_MW (mysql), TS_DB (pgsql)
 168          *       or TS_UNIX (querycache) format, so be sure to always run them
 169          *       through wfTimestamp()
 170          * @return bool
 171          */
 172         function usesTimestamps() {
 173                 return false;
 174         }
 175
 176         /**
 177          * Override to sort by increasing values
 178          *
 179          * @return Boolean
 180          */
 181         function sortDescending() {
 182                 return true;
 183         }
 184
 185         /**
 186          * Is this query expensive (for some definition of expensive)? Then we
 187          * don't let it run in miser mode. $wgDisableQueryPages causes all query
 188          * pages to be declared expensive. Some query pages are always expensive.
 189          *
 190          * @return Boolean
 191          */
 192         function isExpensive() {
 193                 global $wgDisableQueryPages;
 194                 return $wgDisableQueryPages;
 195         }
 196
 197         /**
 198          * Is the output of this query cacheable? Non-cacheable expensive pages
 199          * will be disabled in miser mode and will not have their results written
 200          * to the querycache table.
 201          * @return Boolean
 202          */
 203         public function isCacheable() {
 204                 return true;
 205         }
 206
 207         /**
 208          * Whether or not the output of the page in question is retrieved from
 209          * the database cache.
 210          *
 211          * @return Boolean
 212          */
 213         function isCached() {
 214                 global $wgMiserMode;
 215
 216                 return $this->isExpensive() && $wgMiserMode;
 217         }
 218
 219         /**
 220          * Sometime we dont want to build rss / atom feeds.
 221          *
 222          * @return Boolean
 223          */
 224         function isSyndicated() {
 225                 return true;
 226         }
 227
 228         /**
 229          * Formats the results of the query for display. The skin is the current
 230          * skin; you can use it for making links. The result is a single row of
 231          * result data. You should be able to grab SQL results off of it.
 232          * If the function returns false, the line output will be skipped.
 233          * @param $skin Skin
 234          * @param $result object Result row
 235          * @return mixed String or false to skip
 236          *
 237          * @param $skin Skin object
 238          * @param $result Object: database row
 239          */
 240         abstract function formatResult( $skin, $result );
 241
 242         /**
 243          * The content returned by this function will be output before any result
 244          *
 245          * @return String
 246          */
 247         function getPageHeader() {
 248                 return '';
 249         }
 250
 251         /**
 252          * If using extra form wheely-dealies, return a set of parameters here
 253          * as an associative array. They will be encoded and added to the paging
 254          * links (prev/next/lengths).
 255          *
 256          * @return Array
 257          */
 258         function linkParameters() {
 259                 return array();
 260         }
 261
 262         /**
 263          * Some special pages (for example SpecialListusers) might not return the
 264          * current object formatted, but return the previous one instead.
 265          * Setting this to return true will ensure formatResult() is called
 266          * one more time to make sure that the very last result is formatted
 267          * as well.
 268          */
 269         function tryLastResult() {
 270                 return false;
 271         }
 272
 273         /**
 274          * Clear the cache and save new results
 275          *
 276          * @param $limit Integer: limit for SQL statement
 277          * @param $ignoreErrors Boolean: whether to ignore database errors
 278          */
 279         function recache( $limit, $ignoreErrors = true ) {
 280                 $fname = get_class( $this ) . '::recache';
 281                 $dbw = wfGetDB( DB_MASTER );
 282                 $dbr = wfGetDB( DB_SLAVE, array( $this->getName(), __METHOD__, 'vslow' ) );
 283                 if ( !$dbw || !$dbr || !$this->isCacheable() ) {
 284                         return false;
 285                 }
 286
 287                 if ( $ignoreErrors ) {
 288                         $ignoreW = $dbw->ignoreErrors( true );
 289                         $ignoreR = $dbr->ignoreErrors( true );
 290                 }
 291
 292                 # Clear out any old cached data
 293                 $dbw->delete( 'querycache', array( 'qc_type' => $this->getName() ), $fname );
 294                 # Do query
 295                 $res = $this->reallyDoQuery( $limit, false );
 296                 $num = false;
 297                 if ( $res ) {
 298                         $num = $dbr->numRows( $res );
 299                         # Fetch results
 300                         $vals = array();
 301                         while ( $res && $row = $dbr->fetchObject( $res ) ) {
 302                                 if ( isset( $row->value ) ) {
 303                                         if ( $this->usesTimestamps() ) {
 304                                                 $value = wfTimestamp( TS_UNIX,
 305                                                         $row->value );
 306                                         } else {
 307                                                 $value = intval( $row->value ); // @bug 14414
 308                                         }
 309                                 } else {
 310                                         $value = 0;
 311                                 }
 312
 313                                 $vals[] = array( 'qc_type' => $this->getName(),
 314                                                 'qc_namespace' => $row->namespace,
 315                                                 'qc_title' => $row->title,
 316                                                 'qc_value' => $value );
 317                         }
 318
 319                         # Save results into the querycache table on the master
 320                         if ( count( $vals ) ) {
 321                                 if ( !$dbw->insert( 'querycache', $vals, __METHOD__ ) ) {
 322                                         // Set result to false to indicate error
 323                                         $num = false;
 324                                 }
 325                         }
 326                         if ( $ignoreErrors ) {
 327                                 $dbw->ignoreErrors( $ignoreW );
 328                                 $dbr->ignoreErrors( $ignoreR );
 329                         }
 330
 331                         # Update the querycache_info record for the page
 332                         $dbw->delete( 'querycache_info', array( 'qci_type' => $this->getName() ), $fname );
 333                         $dbw->insert( 'querycache_info', array( 'qci_type' => $this->getName(), 'qci_timestamp' => $dbw->timestamp() ), $fname );
 334
 335                 }
 336                 return $num;
 337         }
 338
 339         /**
 340          * Run the query and return the result
 341          * @param $limit mixed Numerical limit or false for no limit
 342          * @param $offset mixed Numerical offset or false for no offset
 343          * @return ResultWrapper
 344          */
 345         function reallyDoQuery( $limit, $offset = false ) {
 346                 $fname = get_class( $this ) . "::reallyDoQuery";
 347                 $query = $this->getQueryInfo();
 348                 $order = $this->getOrderFields();
 349                 if ( $this->sortDescending() ) {
 350                         foreach ( $order as &$field ) {
 351                                 $field .= ' DESC';
 352                         }
 353                 }
 354                 if ( is_array( $query ) ) {
 355                         $tables = isset( $query['tables'] ) ? (array)$query['tables'] : array();
 356                         $fields = isset( $query['fields'] ) ? (array)$query['fields'] : array();
 357                         $conds = isset( $query['conds'] ) ? (array)$query['conds'] : array();
 358                         $options = isset( $query['options'] ) ? (array)$query['options'] : array();
 359                         $join_conds = isset( $query['join_conds'] ) ? (array)$query['join_conds'] : array();
 360                         if ( count( $order ) ) {
 361                                 $options['ORDER BY'] = implode( ', ', $order );
 362                         }
 363                         if ( $limit !== false ) {
 364                                 $options['LIMIT'] = intval( $limit );
 365                         }
 366                         if ( $offset !== false ) {
 367                                 $options['OFFSET'] = intval( $offset );
 368                         }
 369
 370                         $dbr = wfGetDB( DB_SLAVE );
 371                         $res = $dbr->select( $tables, $fields, $conds, $fname,
 372                                         $options, $join_conds
 373                         );
 374                 } else {
 375                         // Old-fashioned raw SQL style, deprecated
 376                         $sql = $this->getSQL();
 377                         $sql .= ' ORDER BY ' . implode( ', ', $order );
 378                         $sql = $dbr->limitResult( $sql, $limit, $offset );
 379                         $res = $dbr->query( $sql );
 380                 }
 381                 return $dbr->resultObject( $res );
 382         }
 383
 384         function doQuery( $limit, $offset = false ) {
 385                 if ( $this->isCached() && $this->isCacheable() ) {
 386                         return $this->fetchFromCache( $limit, $offset );
 387                 } else {
 388                         return $this->reallyDoQuery( $limit, $offset );
 389                 }
 390         }
 391
 392         /**
 393          * Fetch the query results from the query cache
 394          * @param $limit mixed Numerical limit or false for no limit
 395          * @param $offset mixed Numerical offset or false for no offset
 396          * @return ResultWrapper
 397          */
 398         function fetchFromCache( $limit, $offset = false ) {
 399                 $dbr = wfGetDB( DB_SLAVE );
 400                 $options = array ();
 401                 if ( $limit !== false ) {
 402                         $options['LIMIT'] = intval( $limit );
 403                 }
 404                 if ( $offset !== false ) {
 405                         $options['OFFSET'] = intval( $offset );
 406                 }
 407                 $res = $dbr->select( 'querycache', array( 'qc_type',
 408                                 'qc_namespace AS namespace',
 409                                 'qc_title AS title',
 410                                 'qc_value AS value' ),
 411                                 array( 'qc_type' => $this->getName() ),
 412                                 __METHOD__, $options
 413                 );
 414                 return $dbr->resultObject( $res );
 415         }
 416
 417         /**
 418          * This is the actual workhorse. It does everything needed to make a
 419          * real, honest-to-gosh query page.
 420          */
 421         function execute( $par ) {
 422                 global $wgUser, $wgOut, $wgLang;
 423
 424                 if ( !$this->userCanExecute( $wgUser ) ) {
 425                         $this->displayRestrictionError();
 426                         return;
 427                 }
 428
 429                 if ( $this->limit == 0 && $this->offset == 0 )
 430                         list( $this->limit, $this->offset ) = wfCheckLimits();
 431                 $sname = $this->getName();
 432                 $fname = get_class( $this ) . '::doQuery';
 433                 $dbr = wfGetDB( DB_SLAVE );
 434
 435                 $this->setHeaders();
 436                 $wgOut->setSyndicated( $this->isSyndicated() );
 437
 438                 if ( $this->isCached() && !$this->isCacheable() ) {
 439                         $wgOut->setSyndicated( false );
 440                         $wgOut->addWikiMsg( 'querypage-disabled' );
 441                         return 0;
 442                 }
 443
 444                 // TODO: Use doQuery()
 445                 // $res = null;
 446                 if ( !$this->isCached() ) {
 447                         $res = $this->reallyDoQuery( $this->limit, $this->offset );
 448                 } else {
 449                         # Get the cached result
 450                         $res = $this->fetchFromCache( $this->limit, $this->offset );
 451                         if ( !$this->listoutput ) {
 452
 453                                 # Fetch the timestamp of this update
 454                                 $tRes = $dbr->select( 'querycache_info', array( 'qci_timestamp' ), array( 'qci_type' => $sname ), $fname );
 455                                 $tRow = $dbr->fetchObject( $tRes );
 456
 457                                 if ( $tRow ) {
 458                                         $updated = $wgLang->timeanddate( $tRow->qci_timestamp, true, true );
 459                                         $updateddate = $wgLang->date( $tRow->qci_timestamp, true, true );
 460                                         $updatedtime = $wgLang->time( $tRow->qci_timestamp, true, true );
 461                                         $wgOut->addMeta( 'Data-Cache-Time', $tRow->qci_timestamp );
 462                                         $wgOut->addInlineScript( "var dataCacheTime = '{$tRow->qci_timestamp}';" );
 463                                         $wgOut->addWikiMsg( 'perfcachedts', $updated, $updateddate, $updatedtime );
 464                                 } else {
 465                                         $wgOut->addWikiMsg( 'perfcached' );
 466                                 }
 467
 468                                 # If updates on this page have been disabled, let the user know
 469                                 # that the data set won't be refreshed for now
 470                                 global $wgDisableQueryPageUpdate;
 471                                 if ( is_array( $wgDisableQueryPageUpdate ) && in_array( $this->getName(), $wgDisableQueryPageUpdate ) ) {
 472                                         $wgOut->addWikiMsg( 'querypage-no-updates' );
 473                                 }
 474
 475                         }
 476
 477                 }
 478
 479                 $this->numRows = $dbr->numRows( $res );
 480
 481                 $this->preprocessResults( $dbr, $res );
 482
 483                 $wgOut->addHTML( Xml::openElement( 'div', array( 'class' => 'mw-spcontent' ) ) );
 484
 485                 # Top header and navigation
 486                 if ( $this->shownavigation ) {
 487                         $wgOut->addHTML( $this->getPageHeader() );
 488                         if ( $this->numRows > 0 ) {
 489                                 $wgOut->addHTML( '<p>' . wfShowingResults( $this->offset, $this->numRows ) . '</p>' );
 490                                 # Disable the "next" link when we reach the end
 491                                 $paging = wfViewPrevNext( $this->offset, $this->limit,
 492                                         $this->getTitle( $par ),
 493                                         wfArrayToCGI( $this->linkParameters() ), ( $this->numRows < $this->limit ) );
 494                                 $wgOut->addHTML( '<p>' . $paging . '</p>' );
 495                         } else {
 496                                 # No results to show, so don't bother with "showing X of Y" etc.
 497                                 # -- just let the user know and give up now
 498                                 $wgOut->addHTML( '<p>' . wfMsgHtml( 'specialpage-empty' ) . '</p>' );
 499                                 $wgOut->addHTML( Xml::closeElement( 'div' ) );
 500                                 return;
 501                         }
 502                 }
 503
 504                 # The actual results; specialist subclasses will want to handle this
 505                 # with more than a straight list, so we hand them the info, plus
 506                 # an OutputPage, and let them get on with it
 507                 $this->outputResults( $wgOut,
 508                         $wgUser->getSkin(),
 509                         $dbr, # Should use a ResultWrapper for this
 510                         $res,
 511                         $this->numRows,
 512                         $this->offset );
 513
 514                 # Repeat the paging links at the bottom
 515                 if ( $this->shownavigation ) {
 516                         $wgOut->addHTML( '<p>' . $paging . '</p>' );
 517                 }
 518
 519                 $wgOut->addHTML( Xml::closeElement( 'div' ) );
 520
 521                 return $this->numRows;
 522         }
 523
 524         /**
 525          * Format and output report results using the given information plus
 526          * OutputPage
 527          *
 528          * @param $out OutputPage to print to
 529          * @param $skin Skin: user skin to use
 530          * @param $dbr Database (read) connection to use
 531          * @param $res Integer: result pointer
 532          * @param $num Integer: number of available result rows
 533          * @param $offset Integer: paging offset
 534          */
 535         protected function outputResults( $out, $skin, $dbr, $res, $num, $offset ) {
 536                 global $wgContLang;
 537
 538                 if ( $num > 0 ) {
 539                         $html = array();
 540                         if ( !$this->listoutput )
 541                                 $html[] = $this->openList( $offset );
 542
 543                         # $res might contain the whole 1,000 rows, so we read up to
 544                         # $num [should update this to use a Pager]
 545                         for ( $i = 0; $i < $num && $row = $dbr->fetchObject( $res ); $i++ ) {
 546                                 $line = $this->formatResult( $skin, $row );
 547                                 if ( $line ) {
 548                                         $attr = ( isset( $row->usepatrol ) && $row->usepatrol && $row->patrolled == 0 )
 549                                                 ? ' class="not-patrolled"'
 550                                                 : '';
 551                                         $html[] = $this->listoutput
 552                                                 ? $line
 553                                                 : "<li{$attr}>{$line}</li>\n";
 554                                 }
 555                         }
 556
 557                         # Flush the final result
 558                         if ( $this->tryLastResult() ) {
 559                                 $row = null;
 560                                 $line = $this->formatResult( $skin, $row );
 561                                 if ( $line ) {
 562                                         $attr = ( isset( $row->usepatrol ) && $row->usepatrol && $row->patrolled == 0 )
 563                                                 ? ' class="not-patrolled"'
 564                                                 : '';
 565                                         $html[] = $this->listoutput
 566                                                 ? $line
 567                                                 : "<li{$attr}>{$line}</li>\n";
 568                                 }
 569                         }
 570
 571                         if ( !$this->listoutput )
 572                                 $html[] = $this->closeList();
 573
 574                         $html = $this->listoutput
 575                                 ? $wgContLang->listToText( $html )
 576                                 : implode( '', $html );
 577
 578                         $out->addHTML( $html );
 579                 }
 580         }
 581
 582         function openList( $offset ) {
 583                 return "\n<ol start='" . ( $offset + 1 ) . "' class='special'>\n";
 584         }
 585
 586         function closeList() {
 587                 return "</ol>\n";
 588         }
 589
 590         /**
 591          * Do any necessary preprocessing of the result object.
 592          */
 593         function preprocessResults( $db, $res ) {}
 594
 595         /**
 596          * Similar to above, but packaging in a syndicated feed instead of a web page
 597          */
 598         function doFeed( $class = '', $limit = 50 ) {
 599                 global $wgFeed, $wgFeedClasses;
 600
 601                 if ( !$wgFeed ) {
 602                         global $wgOut;
 603                         $wgOut->addWikiMsg( 'feed-unavailable' );
 604                         return;
 605                 }
 606
 607                 global $wgFeedLimit;
 608                 if ( $limit > $wgFeedLimit ) {
 609                         $limit = $wgFeedLimit;
 610                 }
 611
 612                 if ( isset( $wgFeedClasses[$class] ) ) {
 613                         $feed = new $wgFeedClasses[$class](
 614                                 $this->feedTitle(),
 615                                 $this->feedDesc(),
 616                                 $this->feedUrl() );
 617                         $feed->outHeader();
 618
 619                         $dbr = wfGetDB( DB_SLAVE );
 620                         $res = $this->reallyDoQuery( $limit, 0 );
 621                         foreach ( $res as $obj ) {
 622                                 $item = $this->feedResult( $obj );
 623                                 if ( $item ) {
 624                                         $feed->outItem( $item );
 625                                 }
 626                         }
 627
 628                         $feed->outFooter();
 629                         return true;
 630                 } else {
 631                         return false;
 632                 }
 633         }
 634
 635         /**
 636          * Override for custom handling. If the titles/links are ok, just do
 637          * feedItemDesc()
 638          */
 639         function feedResult( $row ) {
 640                 if ( !isset( $row->title ) ) {
 641                         return null;
 642                 }
 643                 $title = Title::MakeTitle( intval( $row->namespace ), $row->title );
 644                 if ( $title ) {
 645                         $date = isset( $row->timestamp ) ? $row->timestamp : '';
 646                         $comments = '';
 647                         if ( $title ) {
 648                                 $talkpage = $title->getTalkPage();
 649                                 $comments = $talkpage->getFullURL();
 650                         }
 651
 652                         return new FeedItem(
 653                                 $title->getPrefixedText(),
 654                                 $this->feedItemDesc( $row ),
 655                                 $title->getFullURL(),
 656                                 $date,
 657                                 $this->feedItemAuthor( $row ),
 658                                 $comments );
 659                 } else {
 660                         return null;
 661                 }
 662         }
 663
 664         function feedItemDesc( $row ) {
 665                 return isset( $row->comment ) ? htmlspecialchars( $row->comment ) : '';
 666         }
 667
 668         function feedItemAuthor( $row ) {
 669                 return isset( $row->user_text ) ? $row->user_text : '';
 670         }
 671
 672         function feedTitle() {
 673                 global $wgLanguageCode, $wgSitename;
 674                 $page = SpecialPage::getPage( $this->getName() );
 675                 $desc = $page->getDescription();
 676                 return "$wgSitename - $desc [$wgLanguageCode]";
 677         }
 678
 679         function feedDesc() {
 680                 return wfMsgExt( 'tagline', 'parsemag' );
 681         }
 682
 683         function feedUrl() {
 684                 $title = SpecialPage::getTitleFor( $this->getName() );
 685                 return $title->getFullURL();
 686         }
 687 }
 688
 689 /**
 690  * Class definition for a wanted query page like
 691  * WantedPages, WantedTemplates, etc
 692  */
 693 abstract class WantedQueryPage extends QueryPage {
 694
 695         function isExpensive() {
 696                 return true;
 697         }
 698
 699         function isSyndicated() {
 700                 return false;
 701         }
 702
 703         /**
 704          * Cache page existence for performance
 705          */
 706         function preprocessResults( $db, $res ) {
 707                 $batch = new LinkBatch;
 708                 foreach ( $res as $row ) {
 709                         $batch->add( $row->namespace, $row->title );
 710                 }
 711                 $batch->execute();
 712
 713                 // Back to start for display
 714                 if ( $db->numRows( $res ) > 0 )
 715                         // If there are no rows we get an error seeking.
 716                         $db->dataSeek( $res, 0 );
 717         }
 718
 719         /**
 720          * Should formatResult() always check page existence, even if
 721          * the results are fresh?  This is a (hopefully temporary)
 722          * kluge for Special:WantedFiles, which may contain false
 723          * positives for files that exist e.g. in a shared repo (bug
 724          * 6220).
 725          */
 726         function forceExistenceCheck() {
 727                 return false;
 728         }
 729
 730         /**
 731          * Format an individual result
 732          *
 733          * @param $skin Skin to use for UI elements
 734          * @param $result Result row
 735          * @return string
 736          */
 737         public function formatResult( $skin, $result ) {
 738                 $title = Title::makeTitleSafe( $result->namespace, $result->title );
 739                 if ( $title instanceof Title ) {
 740                         if ( $this->isCached() || $this->forceExistenceCheck() ) {
 741                                 $pageLink = $title->isKnown()
 742                                         ? '<del>' . $skin->link( $title ) . '</del>'
 743                                         : $skin->link(
 744                                                 $title,
 745                                                 null,
 746                                                 array(),
 747                                                 array(),
 748                                                 array( 'broken' )
 749                                         );
 750                         } else {
 751                                 $pageLink = $skin->link(
 752                                         $title,
 753                                         null,
 754                                         array(),
 755                                         array(),
 756                                         array( 'broken' )
 757                                 );
 758                         }
 759                         return wfSpecialList( $pageLink, $this->makeWlhLink( $title, $skin, $result ) );
 760                 } else {
 761                         $tsafe = htmlspecialchars( $result->title );
 762                         return wfMsgHtml( 'wantedpages-badtitle', $tsafe );
 763                 }
 764         }
 765
 766         /**
 767          * Make a "what links here" link for a given title
 768          *
 769          * @param $title Title to make the link for
 770          * @param $skin Skin object to use
 771          * @param $result Object: result row
 772          * @return string
 773          */
 774         private function makeWlhLink( $title, $skin, $result ) {
 775                 global $wgLang;
 776                 $wlh = SpecialPage::getTitleFor( 'Whatlinkshere' );
 777                 $label = wfMsgExt( 'nlinks', array( 'parsemag', 'escape' ),
 778                 $wgLang->formatNum( $result->value ) );
 779                 return $skin->link( $wlh, $label, array(), array( 'target' => $title->getPrefixedText() ) );
 780         }
 781 }