includes/specialpage/QueryPage.php

   1 <?php
   2 /**
   3  * Base code for "query" special pages.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * This is a class for doing query pages; since they're almost all the same,
  26  * we factor out some of the functionality into a superclass, and let
  27  * subclasses derive from it.
  28  * @ingroup SpecialPage
  29  */
  30 abstract class QueryPage extends SpecialPage {
  31         /** @var bool Whether or not we want plain listoutput rather than an ordered list */
  32         protected $listoutput = false;
  33
  34         /** @var int The offset and limit in use, as passed to the query() function */
  35         protected $offset = 0;
  36
  37         /** @var int */
  38         protected $limit = 0;
  39
  40         /**
  41          * The number of rows returned by the query. Reading this variable
  42          * only makes sense in functions that are run after the query has been
  43          * done, such as preprocessResults() and formatRow().
  44          */
  45         protected $numRows;
  46
  47         protected $cachedTimestamp = null;
  48
  49         /**
  50          * Whether to show prev/next links
  51          */
  52         protected $shownavigation = true;
  53
  54         /**
  55          * Get a list of query page classes and their associated special pages,
  56          * for periodic updates.
  57          *
  58          * DO NOT CHANGE THIS LIST without testing that
  59          * maintenance/updateSpecialPages.php still works.
  60          * @return array
  61          */
  62         public static function getPages() {
  63                 static $qp = null;
  64
  65                 if ( $qp === null ) {
  66                         // QueryPage subclass, Special page name
  67                         $qp = array(
  68                                 array( 'AncientPagesPage', 'Ancientpages' ),
  69                                 array( 'BrokenRedirectsPage', 'BrokenRedirects' ),
  70                                 array( 'DeadendPagesPage', 'Deadendpages' ),
  71                                 array( 'DoubleRedirectsPage', 'DoubleRedirects' ),
  72                                 array( 'FileDuplicateSearchPage', 'FileDuplicateSearch' ),
  73                                 array( 'ListDuplicatedFilesPage', 'ListDuplicatedFiles'),
  74                                 array( 'LinkSearchPage', 'LinkSearch' ),
  75                                 array( 'ListredirectsPage', 'Listredirects' ),
  76                                 array( 'LonelyPagesPage', 'Lonelypages' ),
  77                                 array( 'LongPagesPage', 'Longpages' ),
  78                                 array( 'MediaStatisticsPage', 'MediaStatistics' ),
  79                                 array( 'MIMEsearchPage', 'MIMEsearch' ),
  80                                 array( 'MostcategoriesPage', 'Mostcategories' ),
  81                                 array( 'MostimagesPage', 'Mostimages' ),
  82                                 array( 'MostinterwikisPage', 'Mostinterwikis' ),
  83                                 array( 'MostlinkedCategoriesPage', 'Mostlinkedcategories' ),
  84                                 array( 'MostlinkedTemplatesPage', 'Mostlinkedtemplates' ),
  85                                 array( 'MostlinkedPage', 'Mostlinked' ),
  86                                 array( 'MostrevisionsPage', 'Mostrevisions' ),
  87                                 array( 'FewestrevisionsPage', 'Fewestrevisions' ),
  88                                 array( 'ShortPagesPage', 'Shortpages' ),
  89                                 array( 'UncategorizedCategoriesPage', 'Uncategorizedcategories' ),
  90                                 array( 'UncategorizedPagesPage', 'Uncategorizedpages' ),
  91                                 array( 'UncategorizedImagesPage', 'Uncategorizedimages' ),
  92                                 array( 'UncategorizedTemplatesPage', 'Uncategorizedtemplates' ),
  93                                 array( 'UnusedCategoriesPage', 'Unusedcategories' ),
  94                                 array( 'UnusedimagesPage', 'Unusedimages' ),
  95                                 array( 'WantedCategoriesPage', 'Wantedcategories' ),
  96                                 array( 'WantedFilesPage', 'Wantedfiles' ),
  97                                 array( 'WantedPagesPage', 'Wantedpages' ),
  98                                 array( 'WantedTemplatesPage', 'Wantedtemplates' ),
  99                                 array( 'UnwatchedpagesPage', 'Unwatchedpages' ),
 100                                 array( 'UnusedtemplatesPage', 'Unusedtemplates' ),
 101                                 array( 'WithoutInterwikiPage', 'Withoutinterwiki' ),
 102                         );
 103                         Hooks::run( 'wgQueryPages', array( &$qp ) );
 104                 }
 105
 106                 return $qp;
 107         }
 108
 109         /**
 110          * A mutator for $this->listoutput;
 111          *
 112          * @param bool $bool
 113          */
 114         function setListoutput( $bool ) {
 115                 $this->listoutput = $bool;
 116         }
 117
 118         /**
 119          * Subclasses return an SQL query here, formatted as an array with the
 120          * following keys:
 121          *    tables => Table(s) for passing to Database::select()
 122          *    fields => Field(s) for passing to Database::select(), may be *
 123          *    conds => WHERE conditions
 124          *    options => options
 125          *    join_conds => JOIN conditions
 126          *
 127          * Note that the query itself should return the following three columns:
 128          * 'namespace', 'title', and 'value'. 'value' is used for sorting.
 129          *
 130          * These may be stored in the querycache table for expensive queries,
 131          * and that cached data will be returned sometimes, so the presence of
 132          * extra fields can't be relied upon. The cached 'value' column will be
 133          * an integer; non-numeric values are useful only for sorting the
 134          * initial query (except if they're timestamps, see usesTimestamps()).
 135          *
 136          * Don't include an ORDER or LIMIT clause, they will be added.
 137          *
 138          * If this function is not overridden or returns something other than
 139          * an array, getSQL() will be used instead. This is for backwards
 140          * compatibility only and is strongly deprecated.
 141          * @return array
 142          * @since 1.18
 143          */
 144         function getQueryInfo() {
 145                 return null;
 146         }
 147
 148         /**
 149          * For back-compat, subclasses may return a raw SQL query here, as a string.
 150          * This is strongly deprecated; getQueryInfo() should be overridden instead.
 151          * @throws MWException
 152          * @return string
 153          */
 154         function getSQL() {
 155                 /* Implement getQueryInfo() instead */
 156                 throw new MWException( "Bug in a QueryPage: doesn't implement getQueryInfo() nor "
 157                         . "getQuery() properly" );
 158         }
 159
 160         /**
 161          * Subclasses return an array of fields to order by here. Don't append
 162          * DESC to the field names, that'll be done automatically if
 163          * sortDescending() returns true.
 164          * @return array
 165          * @since 1.18
 166          */
 167         function getOrderFields() {
 168                 return array( 'value' );
 169         }
 170
 171         /**
 172          * Does this query return timestamps rather than integers in its
 173          * 'value' field? If true, this class will convert 'value' to a
 174          * UNIX timestamp for caching.
 175          * NOTE: formatRow() may get timestamps in TS_MW (mysql), TS_DB (pgsql)
 176          *       or TS_UNIX (querycache) format, so be sure to always run them
 177          *       through wfTimestamp()
 178          * @return bool
 179          * @since 1.18
 180          */
 181         function usesTimestamps() {
 182                 return false;
 183         }
 184
 185         /**
 186          * Override to sort by increasing values
 187          *
 188          * @return bool
 189          */
 190         function sortDescending() {
 191                 return true;
 192         }
 193
 194         /**
 195          * Is this query expensive (for some definition of expensive)? Then we
 196          * don't let it run in miser mode. $wgDisableQueryPages causes all query
 197          * pages to be declared expensive. Some query pages are always expensive.
 198          *
 199          * @return bool
 200          */
 201         function isExpensive() {
 202                 return $this->getConfig()->get( 'DisableQueryPages' );
 203         }
 204
 205         /**
 206          * Is the output of this query cacheable? Non-cacheable expensive pages
 207          * will be disabled in miser mode and will not have their results written
 208          * to the querycache table.
 209          * @return bool
 210          * @since 1.18
 211          */
 212         public function isCacheable() {
 213                 return true;
 214         }
 215
 216         /**
 217          * Whether or not the output of the page in question is retrieved from
 218          * the database cache.
 219          *
 220          * @return bool
 221          */
 222         function isCached() {
 223                 return $this->isExpensive() && $this->getConfig()->get( 'MiserMode' );
 224         }
 225
 226         /**
 227          * Sometime we don't want to build rss / atom feeds.
 228          *
 229          * @return bool
 230          */
 231         function isSyndicated() {
 232                 return true;
 233         }
 234
 235         /**
 236          * Formats the results of the query for display. The skin is the current
 237          * skin; you can use it for making links. The result is a single row of
 238          * result data. You should be able to grab SQL results off of it.
 239          * If the function returns false, the line output will be skipped.
 240          * @param Skin $skin
 241          * @param object $result Result row
 242          * @return string|bool String or false to skip
 243          */
 244         abstract function formatResult( $skin, $result );
 245
 246         /**
 247          * The content returned by this function will be output before any result
 248          *
 249          * @return string
 250          */
 251         function getPageHeader() {
 252                 return '';
 253         }
 254
 255         /**
 256          * Outputs some kind of an informative message (via OutputPage) to let the
 257          * user know that the query returned nothing and thus there's nothing to
 258          * show.
 259          *
 260          * @since 1.26
 261          */
 262         protected function showEmptyText() {
 263                 $this->getOutput()->addWikiMsg( 'specialpage-empty' );
 264         }
 265
 266         /**
 267          * If using extra form wheely-dealies, return a set of parameters here
 268          * as an associative array. They will be encoded and added to the paging
 269          * links (prev/next/lengths).
 270          *
 271          * @return array
 272          */
 273         function linkParameters() {
 274                 return array();
 275         }
 276
 277         /**
 278          * Some special pages (for example SpecialListusers) might not return the
 279          * current object formatted, but return the previous one instead.
 280          * Setting this to return true will ensure formatResult() is called
 281          * one more time to make sure that the very last result is formatted
 282          * as well.
 283          * @return bool
 284          */
 285         function tryLastResult() {
 286                 return false;
 287         }
 288
 289         /**
 290          * Clear the cache and save new results
 291          *
 292          * @param int|bool $limit Limit for SQL statement
 293          * @param bool $ignoreErrors Whether to ignore database errors
 294          * @throws DBError|Exception
 295          * @return bool|int
 296          */
 297         function recache( $limit, $ignoreErrors = true ) {
 298                 if ( !$this->isCacheable() ) {
 299                         return 0;
 300                 }
 301
 302                 $fname = get_class( $this ) . '::recache';
 303                 $dbw = wfGetDB( DB_MASTER );
 304                 if ( !$dbw ) {
 305                         return false;
 306                 }
 307
 308                 try {
 309                         # Do query
 310                         $res = $this->reallyDoQuery( $limit, false );
 311                         $num = false;
 312                         if ( $res ) {
 313                                 $num = $res->numRows();
 314                                 # Fetch results
 315                                 $vals = array();
 316                                 foreach ( $res as $row ) {
 317                                         if ( isset( $row->value ) ) {
 318                                                 if ( $this->usesTimestamps() ) {
 319                                                         $value = wfTimestamp( TS_UNIX,
 320                                                                 $row->value );
 321                                                 } else {
 322                                                         $value = intval( $row->value ); // @bug 14414
 323                                                 }
 324                                         } else {
 325                                                 $value = 0;
 326                                         }
 327
 328                                         $vals[] = array( 'qc_type' => $this->getName(),
 329                                                         'qc_namespace' => $row->namespace,
 330                                                         'qc_title' => $row->title,
 331                                                         'qc_value' => $value );
 332                                 }
 333
 334                                 $dbw->startAtomic( __METHOD__ );
 335                                 # Clear out any old cached data
 336                                 $dbw->delete( 'querycache', array( 'qc_type' => $this->getName() ), $fname );
 337                                 # Save results into the querycache table on the master
 338                                 if ( count( $vals ) ) {
 339                                         $dbw->insert( 'querycache', $vals, __METHOD__ );
 340                                 }
 341                                 # Update the querycache_info record for the page
 342                                 $dbw->delete( 'querycache_info', array( 'qci_type' => $this->getName() ), $fname );
 343                                 $dbw->insert( 'querycache_info',
 344                                         array( 'qci_type' => $this->getName(), 'qci_timestamp' => $dbw->timestamp() ),
 345                                         $fname );
 346                                 $dbw->endAtomic( __METHOD__ );
 347                         }
 348                 } catch ( DBError $e ) {
 349                         if ( !$ignoreErrors ) {
 350                                 throw $e; // report query error
 351                         }
 352                         $num = false; // set result to false to indicate error
 353                 }
 354
 355                 return $num;
 356         }
 357
 358         /**
 359          * Get a DB connection to be used for slow recache queries
 360          * @return IDatabase
 361          */
 362         function getRecacheDB() {
 363                 return wfGetDB( DB_SLAVE, array( $this->getName(), 'QueryPage::recache', 'vslow' ) );
 364         }
 365
 366         /**
 367          * Run the query and return the result
 368          * @param int|bool $limit Numerical limit or false for no limit
 369          * @param int|bool $offset Numerical offset or false for no offset
 370          * @return ResultWrapper
 371          * @since 1.18
 372          */
 373         function reallyDoQuery( $limit, $offset = false ) {
 374                 $fname = get_class( $this ) . "::reallyDoQuery";
 375                 $dbr = $this->getRecacheDB();
 376                 $query = $this->getQueryInfo();
 377                 $order = $this->getOrderFields();
 378
 379                 if ( $this->sortDescending() ) {
 380                         foreach ( $order as &$field ) {
 381                                 $field .= ' DESC';
 382                         }
 383                 }
 384
 385                 if ( is_array( $query ) ) {
 386                         $tables = isset( $query['tables'] ) ? (array)$query['tables'] : array();
 387                         $fields = isset( $query['fields'] ) ? (array)$query['fields'] : array();
 388                         $conds = isset( $query['conds'] ) ? (array)$query['conds'] : array();
 389                         $options = isset( $query['options'] ) ? (array)$query['options'] : array();
 390                         $join_conds = isset( $query['join_conds'] ) ? (array)$query['join_conds'] : array();
 391
 392                         if ( count( $order ) ) {
 393                                 $options['ORDER BY'] = $order;
 394                         }
 395
 396                         if ( $limit !== false ) {
 397                                 $options['LIMIT'] = intval( $limit );
 398                         }
 399
 400                         if ( $offset !== false ) {
 401                                 $options['OFFSET'] = intval( $offset );
 402                         }
 403
 404                         $res = $dbr->select( $tables, $fields, $conds, $fname,
 405                                         $options, $join_conds
 406                         );
 407                 } else {
 408                         // Old-fashioned raw SQL style, deprecated
 409                         $sql = $this->getSQL();
 410                         $sql .= ' ORDER BY ' . implode( ', ', $order );
 411                         $sql = $dbr->limitResult( $sql, $limit, $offset );
 412                         $res = $dbr->query( $sql, $fname );
 413                 }
 414
 415                 return $res;
 416         }
 417
 418         /**
 419          * Somewhat deprecated, you probably want to be using execute()
 420          * @param int|bool $offset
 421          * @param int|bool $limit
 422          * @return ResultWrapper
 423          */
 424         function doQuery( $offset = false, $limit = false ) {
 425                 if ( $this->isCached() && $this->isCacheable() ) {
 426                         return $this->fetchFromCache( $limit, $offset );
 427                 } else {
 428                         return $this->reallyDoQuery( $limit, $offset );
 429                 }
 430         }
 431
 432         /**
 433          * Fetch the query results from the query cache
 434          * @param int|bool $limit Numerical limit or false for no limit
 435          * @param int|bool $offset Numerical offset or false for no offset
 436          * @return ResultWrapper
 437          * @since 1.18
 438          */
 439         function fetchFromCache( $limit, $offset = false ) {
 440                 $dbr = wfGetDB( DB_SLAVE );
 441                 $options = array();
 442                 if ( $limit !== false ) {
 443                         $options['LIMIT'] = intval( $limit );
 444                 }
 445                 if ( $offset !== false ) {
 446                         $options['OFFSET'] = intval( $offset );
 447                 }
 448                 if ( $this->sortDescending() ) {
 449                         $options['ORDER BY'] = 'qc_value DESC';
 450                 } else {
 451                         $options['ORDER BY'] = 'qc_value ASC';
 452                 }
 453                 $res = $dbr->select( 'querycache', array( 'qc_type',
 454                                 'namespace' => 'qc_namespace',
 455                                 'title' => 'qc_title',
 456                                 'value' => 'qc_value' ),
 457                                 array( 'qc_type' => $this->getName() ),
 458                                 __METHOD__, $options
 459                 );
 460                 return $dbr->resultObject( $res );
 461         }
 462
 463         public function getCachedTimestamp() {
 464                 if ( is_null( $this->cachedTimestamp ) ) {
 465                         $dbr = wfGetDB( DB_SLAVE );
 466                         $fname = get_class( $this ) . '::getCachedTimestamp';
 467                         $this->cachedTimestamp = $dbr->selectField( 'querycache_info', 'qci_timestamp',
 468                                 array( 'qci_type' => $this->getName() ), $fname );
 469                 }
 470                 return $this->cachedTimestamp;
 471         }
 472
 473         /**
 474          * This is the actual workhorse. It does everything needed to make a
 475          * real, honest-to-gosh query page.
 476          * @param string $par
 477          */
 478         function execute( $par ) {
 479                 $user = $this->getUser();
 480                 if ( !$this->userCanExecute( $user ) ) {
 481                         $this->displayRestrictionError();
 482                         return;
 483                 }
 484
 485                 $this->setHeaders();
 486                 $this->outputHeader();
 487
 488                 $out = $this->getOutput();
 489
 490                 if ( $this->isCached() && !$this->isCacheable() ) {
 491                         $out->addWikiMsg( 'querypage-disabled' );
 492                         return;
 493                 }
 494
 495                 $out->setSyndicated( $this->isSyndicated() );
 496
 497                 if ( $this->limit == 0 && $this->offset == 0 ) {
 498                         list( $this->limit, $this->offset ) = $this->getRequest()->getLimitOffset();
 499                 }
 500
 501                 // @todo Use doQuery()
 502                 if ( !$this->isCached() ) {
 503                         # select one extra row for navigation
 504                         $res = $this->reallyDoQuery( $this->limit + 1, $this->offset );
 505                 } else {
 506                         # Get the cached result, select one extra row for navigation
 507                         $res = $this->fetchFromCache( $this->limit + 1, $this->offset );
 508                         if ( !$this->listoutput ) {
 509
 510                                 # Fetch the timestamp of this update
 511                                 $ts = $this->getCachedTimestamp();
 512                                 $lang = $this->getLanguage();
 513                                 $maxResults = $lang->formatNum( $this->getConfig()->get( 'QueryCacheLimit' ) );
 514
 515                                 if ( $ts ) {
 516                                         $updated = $lang->userTimeAndDate( $ts, $user );
 517                                         $updateddate = $lang->userDate( $ts, $user );
 518                                         $updatedtime = $lang->userTime( $ts, $user );
 519                                         $out->addMeta( 'Data-Cache-Time', $ts );
 520                                         $out->addJsConfigVars( 'dataCacheTime', $ts );
 521                                         $out->addWikiMsg( 'perfcachedts', $updated, $updateddate, $updatedtime, $maxResults );
 522                                 } else {
 523                                         $out->addWikiMsg( 'perfcached', $maxResults );
 524                                 }
 525
 526                                 # If updates on this page have been disabled, let the user know
 527                                 # that the data set won't be refreshed for now
 528                                 if ( is_array( $this->getConfig()->get( 'DisableQueryPageUpdate' ) )
 529                                         && in_array( $this->getName(), $this->getConfig()->get( 'DisableQueryPageUpdate' ) )
 530                                 ) {
 531                                         $out->wrapWikiMsg(
 532                                                 "<div class=\"mw-querypage-no-updates\">\n$1\n</div>",
 533                                                 'querypage-no-updates'
 534                                         );
 535                                 }
 536                         }
 537                 }
 538
 539                 $this->numRows = $res->numRows();
 540
 541                 $dbr = $this->getRecacheDB();
 542                 $this->preprocessResults( $dbr, $res );
 543
 544                 $out->addHTML( Xml::openElement( 'div', array( 'class' => 'mw-spcontent' ) ) );
 545
 546                 # Top header and navigation
 547                 if ( $this->shownavigation ) {
 548                         $out->addHTML( $this->getPageHeader() );
 549                         if ( $this->numRows > 0 ) {
 550                                 $out->addHTML( $this->msg( 'showingresultsinrange' )->numParams(
 551                                         min( $this->numRows, $this->limit ), # do not show the one extra row, if exist
 552                                         $this->offset + 1, ( min( $this->numRows, $this->limit ) + $this->offset ) )->parseAsBlock() );
 553                                 # Disable the "next" link when we reach the end
 554                                 $paging = $this->getLanguage()->viewPrevNext( $this->getPageTitle( $par ), $this->offset,
 555                                         $this->limit, $this->linkParameters(), ( $this->numRows <= $this->limit ) );
 556                                 $out->addHTML( '<p>' . $paging . '</p>' );
 557                         } else {
 558                                 # No results to show, so don't bother with "showing X of Y" etc.
 559                                 # -- just let the user know and give up now
 560                                 $this->showEmptyText();
 561                                 $out->addHTML( Xml::closeElement( 'div' ) );
 562                                 return;
 563                         }
 564                 }
 565
 566                 # The actual results; specialist subclasses will want to handle this
 567                 # with more than a straight list, so we hand them the info, plus
 568                 # an OutputPage, and let them get on with it
 569                 $this->outputResults( $out,
 570                         $this->getSkin(),
 571                         $dbr, # Should use a ResultWrapper for this
 572                         $res,
 573                         min( $this->numRows, $this->limit ), # do not format the one extra row, if exist
 574                         $this->offset );
 575
 576                 # Repeat the paging links at the bottom
 577                 if ( $this->shownavigation ) {
 578                         $out->addHTML( '<p>' . $paging . '</p>' );
 579                 }
 580
 581                 $out->addHTML( Xml::closeElement( 'div' ) );
 582         }
 583
 584         /**
 585          * Format and output report results using the given information plus
 586          * OutputPage
 587          *
 588          * @param OutputPage $out OutputPage to print to
 589          * @param Skin $skin User skin to use
 590          * @param IDatabase $dbr Database (read) connection to use
 591          * @param ResultWrapper $res Result pointer
 592          * @param int $num Number of available result rows
 593          * @param int $offset Paging offset
 594          */
 595         protected function outputResults( $out, $skin, $dbr, $res, $num, $offset ) {
 596                 global $wgContLang;
 597
 598                 if ( $num > 0 ) {
 599                         $html = array();
 600                         if ( !$this->listoutput ) {
 601                                 $html[] = $this->openList( $offset );
 602                         }
 603
 604                         # $res might contain the whole 1,000 rows, so we read up to
 605                         # $num [should update this to use a Pager]
 606                         // @codingStandardsIgnoreStart Generic.CodeAnalysis.ForLoopWithTestFunctionCall.NotAllowed
 607                         for ( $i = 0; $i < $num && $row = $res->fetchObject(); $i++ ) {
 608                                 // @codingStandardsIgnoreEnd
 609                                 $line = $this->formatResult( $skin, $row );
 610                                 if ( $line ) {
 611                                         $attr = ( isset( $row->usepatrol ) && $row->usepatrol && $row->patrolled == 0 )
 612                                                 ? ' class="not-patrolled"'
 613                                                 : '';
 614                                         $html[] = $this->listoutput
 615                                                 ? $line
 616                                                 : "<li{$attr}>{$line}</li>\n";
 617                                 }
 618                         }
 619
 620                         # Flush the final result
 621                         if ( $this->tryLastResult() ) {
 622                                 $row = null;
 623                                 $line = $this->formatResult( $skin, $row );
 624                                 if ( $line ) {
 625                                         $attr = ( isset( $row->usepatrol ) && $row->usepatrol && $row->patrolled == 0 )
 626                                                 ? ' class="not-patrolled"'
 627                                                 : '';
 628                                         $html[] = $this->listoutput
 629                                                 ? $line
 630                                                 : "<li{$attr}>{$line}</li>\n";
 631                                 }
 632                         }
 633
 634                         if ( !$this->listoutput ) {
 635                                 $html[] = $this->closeList();
 636                         }
 637
 638                         $html = $this->listoutput
 639                                 ? $wgContLang->listToText( $html )
 640                                 : implode( '', $html );
 641
 642                         $out->addHTML( $html );
 643                 }
 644         }
 645
 646         /**
 647          * @param int $offset
 648          * @return string
 649          */
 650         function openList( $offset ) {
 651                 return "\n<ol start='" . ( $offset + 1 ) . "' class='special'>\n";
 652         }
 653
 654         /**
 655          * @return string
 656          */
 657         function closeList() {
 658                 return "</ol>\n";
 659         }
 660
 661         /**
 662          * Do any necessary preprocessing of the result object.
 663          * @param IDatabase $db
 664          * @param ResultWrapper $res
 665          */
 666         function preprocessResults( $db, $res ) {
 667         }
 668
 669         /**
 670          * Similar to above, but packaging in a syndicated feed instead of a web page
 671          * @param string $class
 672          * @param int $limit
 673          * @return bool
 674          */
 675         function doFeed( $class = '', $limit = 50 ) {
 676                 if ( !$this->getConfig()->get( 'Feed' ) ) {
 677                         $this->getOutput()->addWikiMsg( 'feed-unavailable' );
 678                         return false;
 679                 }
 680
 681                 $limit = min( $limit, $this->getConfig()->get( 'FeedLimit' ) );
 682
 683                 $feedClasses = $this->getConfig()->get( 'FeedClasses' );
 684                 if ( isset( $feedClasses[$class] ) ) {
 685                         /** @var RSSFeed|AtomFeed $feed */
 686                         $feed = new $feedClasses[$class](
 687                                 $this->feedTitle(),
 688                                 $this->feedDesc(),
 689                                 $this->feedUrl() );
 690                         $feed->outHeader();
 691
 692                         $res = $this->reallyDoQuery( $limit, 0 );
 693                         foreach ( $res as $obj ) {
 694                                 $item = $this->feedResult( $obj );
 695                                 if ( $item ) {
 696                                         $feed->outItem( $item );
 697                                 }
 698                         }
 699
 700                         $feed->outFooter();
 701                         return true;
 702                 } else {
 703                         return false;
 704                 }
 705         }
 706
 707         /**
 708          * Override for custom handling. If the titles/links are ok, just do
 709          * feedItemDesc()
 710          * @param object $row
 711          * @return FeedItem|null
 712          */
 713         function feedResult( $row ) {
 714                 if ( !isset( $row->title ) ) {
 715                         return null;
 716                 }
 717                 $title = Title::makeTitle( intval( $row->namespace ), $row->title );
 718                 if ( $title ) {
 719                         $date = isset( $row->timestamp ) ? $row->timestamp : '';
 720                         $comments = '';
 721                         if ( $title ) {
 722                                 $talkpage = $title->getTalkPage();
 723                                 $comments = $talkpage->getFullURL();
 724                         }
 725
 726                         return new FeedItem(
 727                                 $title->getPrefixedText(),
 728                                 $this->feedItemDesc( $row ),
 729                                 $title->getFullURL(),
 730                                 $date,
 731                                 $this->feedItemAuthor( $row ),
 732                                 $comments );
 733                 } else {
 734                         return null;
 735                 }
 736         }
 737
 738         function feedItemDesc( $row ) {
 739                 return isset( $row->comment ) ? htmlspecialchars( $row->comment ) : '';
 740         }
 741
 742         function feedItemAuthor( $row ) {
 743                 return isset( $row->user_text ) ? $row->user_text : '';
 744         }
 745
 746         function feedTitle() {
 747                 $desc = $this->getDescription();
 748                 $code = $this->getConfig()->get( 'LanguageCode' );
 749                 $sitename = $this->getConfig()->get( 'Sitename' );
 750                 return "$sitename - $desc [$code]";
 751         }
 752
 753         function feedDesc() {
 754                 return $this->msg( 'tagline' )->text();
 755         }
 756
 757         function feedUrl() {
 758                 return $this->getPageTitle()->getFullURL();
 759         }
 760 }