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