includes/changes/ChangesList.php

   1 <?php
   2 /**
   3  * Base class for all changes lists.
   4  *
   5  * The class is used for formatting recent changes, related changes and watchlist.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  * http://www.gnu.org/copyleft/gpl.html
  21  *
  22  * @file
  23  */
  24
  25 class ChangesList extends ContextSource {
  26         /**
  27          * @var Skin
  28          */
  29         public $skin;
  30
  31         protected $watchlist = false;
  32         protected $lastdate;
  33         protected $message;
  34         protected $rc_cache;
  35         protected $rcCacheIndex;
  36         protected $rclistOpen;
  37         protected $rcMoveIndex;
  38
  39         /** @var BagOStuff */
  40         protected $watchMsgCache;
  41
  42         /**
  43          * Changeslist constructor
  44          *
  45          * @param Skin|IContextSource $obj
  46          */
  47         public function __construct( $obj ) {
  48                 if ( $obj instanceof IContextSource ) {
  49                         $this->setContext( $obj );
  50                         $this->skin = $obj->getSkin();
  51                 } else {
  52                         $this->setContext( $obj->getContext() );
  53                         $this->skin = $obj;
  54                 }
  55                 $this->preCacheMessages();
  56                 $this->watchMsgCache = new HashBagOStuff( array( 'maxKeys' => 50 ) );
  57         }
  58
  59         /**
  60          * Fetch an appropriate changes list class for the specified context
  61          * Some users might want to use an enhanced list format, for instance
  62          *
  63          * @param IContextSource $context
  64          * @return ChangesList
  65          */
  66         public static function newFromContext( IContextSource $context ) {
  67                 $user = $context->getUser();
  68                 $sk = $context->getSkin();
  69                 $list = null;
  70                 if ( Hooks::run( 'FetchChangesList', array( $user, &$sk, &$list ) ) ) {
  71                         $new = $context->getRequest()->getBool( 'enhanced', $user->getOption( 'usenewrc' ) );
  72
  73                         return $new ? new EnhancedChangesList( $context ) : new OldChangesList( $context );
  74                 } else {
  75                         return $list;
  76                 }
  77         }
  78
  79         /**
  80          * Format a line
  81          *
  82          * @since 1.27
  83          *
  84          * @param RecentChange $rc Passed by reference
  85          * @param bool $watched (default false)
  86          * @param int $linenumber (default null)
  87          *
  88          * @return string|bool
  89          */
  90         public function recentChangesLine( &$rc, $watched = false, $linenumber = null ) {
  91                 throw new RuntimeException( 'recentChangesLine should be implemented' );
  92         }
  93
  94         /**
  95          * Sets the list to use a "<li class='watchlist-(namespace)-(page)'>" tag
  96          * @param bool $value
  97          */
  98         public function setWatchlistDivs( $value = true ) {
  99                 $this->watchlist = $value;
 100         }
 101
 102         /**
 103          * @return bool True when setWatchlistDivs has been called
 104          * @since 1.23
 105          */
 106         public function isWatchlist() {
 107                 return (bool)$this->watchlist;
 108         }
 109
 110         /**
 111          * As we use the same small set of messages in various methods and that
 112          * they are called often, we call them once and save them in $this->message
 113          */
 114         private function preCacheMessages() {
 115                 if ( !isset( $this->message ) ) {
 116                         foreach ( array(
 117                                 'cur', 'diff', 'hist', 'enhancedrc-history', 'last', 'blocklink', 'history',
 118                                 'semicolon-separator', 'pipe-separator' ) as $msg
 119                         ) {
 120                                 $this->message[$msg] = $this->msg( $msg )->escaped();
 121                         }
 122                 }
 123         }
 124
 125         /**
 126          * Returns the appropriate flags for new page, minor change and patrolling
 127          * @param array $flags Associative array of 'flag' => Bool
 128          * @param string $nothing To use for empty space
 129          * @return string
 130          */
 131         public function recentChangesFlags( $flags, $nothing = '&#160;' ) {
 132                 $f = '';
 133                 foreach ( array_keys( $this->getConfig()->get( 'RecentChangesFlags' ) ) as $flag ) {
 134                         $f .= isset( $flags[$flag] ) && $flags[$flag]
 135                                 ? self::flag( $flag )
 136                                 : $nothing;
 137                 }
 138
 139                 return $f;
 140         }
 141
 142         /**
 143          * Provide the "<abbr>" element appropriate to a given abbreviated flag,
 144          * namely the flag indicating a new page, a minor edit, a bot edit, or an
 145          * unpatrolled edit.  By default in English it will contain "N", "m", "b",
 146          * "!" respectively, plus it will have an appropriate title and class.
 147          *
 148          * @param string $flag One key of $wgRecentChangesFlags
 149          * @return string Raw HTML
 150          */
 151         public static function flag( $flag ) {
 152                 static $flagInfos = null;
 153                 if ( is_null( $flagInfos ) ) {
 154                         global $wgRecentChangesFlags;
 155                         $flagInfos = array();
 156                         foreach ( $wgRecentChangesFlags as $key => $value ) {
 157                                 $flagInfos[$key]['letter'] = wfMessage( $value['letter'] )->escaped();
 158                                 $flagInfos[$key]['title'] = wfMessage( $value['title'] )->escaped();
 159                                 // Allow customized class name, fall back to flag name
 160                                 $flagInfos[$key]['class'] = Sanitizer::escapeClass(
 161                                         isset( $value['class'] ) ? $value['class'] : $key );
 162                         }
 163                 }
 164
 165                 // Inconsistent naming, bleh, kepted for b/c
 166                 $map = array(
 167                         'minoredit' => 'minor',
 168                         'botedit' => 'bot',
 169                 );
 170                 if ( isset( $map[$flag] ) ) {
 171                         $flag = $map[$flag];
 172                 }
 173
 174                 return "<abbr class='" . $flagInfos[$flag]['class'] . "' title='" .
 175                         $flagInfos[$flag]['title'] . "'>" . $flagInfos[$flag]['letter'] .
 176                         '</abbr>';
 177         }
 178
 179         /**
 180          * Returns text for the start of the tabular part of RC
 181          * @return string
 182          */
 183         public function beginRecentChangesList() {
 184                 $this->rc_cache = array();
 185                 $this->rcMoveIndex = 0;
 186                 $this->rcCacheIndex = 0;
 187                 $this->lastdate = '';
 188                 $this->rclistOpen = false;
 189                 $this->getOutput()->addModuleStyles( 'mediawiki.special.changeslist' );
 190
 191                 return '<div class="mw-changeslist">';
 192         }
 193
 194         /**
 195          * @param ResultWrapper|array $rows
 196          */
 197         public function initChangesListRows( $rows ) {
 198                 Hooks::run( 'ChangesListInitRows', array( $this, $rows ) );
 199         }
 200
 201         /**
 202          * Show formatted char difference
 203          * @param int $old Number of bytes
 204          * @param int $new Number of bytes
 205          * @param IContextSource $context
 206          * @return string
 207          */
 208         public static function showCharacterDifference( $old, $new, IContextSource $context = null ) {
 209                 if ( !$context ) {
 210                         $context = RequestContext::getMain();
 211                 }
 212
 213                 $new = (int)$new;
 214                 $old = (int)$old;
 215                 $szdiff = $new - $old;
 216
 217                 $lang = $context->getLanguage();
 218                 $config = $context->getConfig();
 219                 $code = $lang->getCode();
 220                 static $fastCharDiff = array();
 221                 if ( !isset( $fastCharDiff[$code] ) ) {
 222                         $fastCharDiff[$code] = $config->get( 'MiserMode' )
 223                                 || $context->msg( 'rc-change-size' )->plain() === '$1';
 224                 }
 225
 226                 $formattedSize = $lang->formatNum( $szdiff );
 227
 228                 if ( !$fastCharDiff[$code] ) {
 229                         $formattedSize = $context->msg( 'rc-change-size', $formattedSize )->text();
 230                 }
 231
 232                 if ( abs( $szdiff ) > abs( $config->get( 'RCChangedSizeThreshold' ) ) ) {
 233                         $tag = 'strong';
 234                 } else {
 235                         $tag = 'span';
 236                 }
 237
 238                 if ( $szdiff === 0 ) {
 239                         $formattedSizeClass = 'mw-plusminus-null';
 240                 } elseif ( $szdiff > 0 ) {
 241                         $formattedSize = '+' . $formattedSize;
 242                         $formattedSizeClass = 'mw-plusminus-pos';
 243                 } else {
 244                         $formattedSizeClass = 'mw-plusminus-neg';
 245                 }
 246
 247                 $formattedTotalSize = $context->msg( 'rc-change-size-new' )->numParams( $new )->text();
 248
 249                 return Html::element( $tag,
 250                         array( 'dir' => 'ltr', 'class' => $formattedSizeClass, 'title' => $formattedTotalSize ),
 251                         $context->msg( 'parentheses', $formattedSize )->plain() ) . $lang->getDirMark();
 252         }
 253
 254         /**
 255          * Format the character difference of one or several changes.
 256          *
 257          * @param RecentChange $old
 258          * @param RecentChange $new Last change to use, if not provided, $old will be used
 259          * @return string HTML fragment
 260          */
 261         public function formatCharacterDifference( RecentChange $old, RecentChange $new = null ) {
 262                 $oldlen = $old->mAttribs['rc_old_len'];
 263
 264                 if ( $new ) {
 265                         $newlen = $new->mAttribs['rc_new_len'];
 266                 } else {
 267                         $newlen = $old->mAttribs['rc_new_len'];
 268                 }
 269
 270                 if ( $oldlen === null || $newlen === null ) {
 271                         return '';
 272                 }
 273
 274                 return self::showCharacterDifference( $oldlen, $newlen, $this->getContext() );
 275         }
 276
 277         /**
 278          * Returns text for the end of RC
 279          * @return string
 280          */
 281         public function endRecentChangesList() {
 282                 $out = $this->rclistOpen ? "</ul>\n" : '';
 283                 $out .= '</div>';
 284
 285                 return $out;
 286         }
 287
 288         /**
 289          * @param string $s HTML to update
 290          * @param mixed $rc_timestamp
 291          */
 292         public function insertDateHeader( &$s, $rc_timestamp ) {
 293                 # Make date header if necessary
 294                 $date = $this->getLanguage()->userDate( $rc_timestamp, $this->getUser() );
 295                 if ( $date != $this->lastdate ) {
 296                         if ( $this->lastdate != '' ) {
 297                                 $s .= "</ul>\n";
 298                         }
 299                         $s .= Xml::element( 'h4', null, $date ) . "\n<ul class=\"special\">";
 300                         $this->lastdate = $date;
 301                         $this->rclistOpen = true;
 302                 }
 303         }
 304
 305         /**
 306          * @param string $s HTML to update
 307          * @param Title $title
 308          * @param string $logtype
 309          */
 310         public function insertLog( &$s, $title, $logtype ) {
 311                 $page = new LogPage( $logtype );
 312                 $logname = $page->getName()->escaped();
 313                 $s .= $this->msg( 'parentheses' )->rawParams( Linker::linkKnown( $title, $logname ) )->escaped();
 314         }
 315
 316         /**
 317          * @param string $s HTML to update
 318          * @param RecentChange $rc
 319          * @param bool $unpatrolled
 320          */
 321         public function insertDiffHist( &$s, &$rc, $unpatrolled ) {
 322                 # Diff link
 323                 if (
 324                         $rc->mAttribs['rc_type'] == RC_NEW ||
 325                         $rc->mAttribs['rc_type'] == RC_LOG ||
 326                         $rc->mAttribs['rc_type'] == RC_CATEGORIZE
 327                 ) {
 328                         $diffLink = $this->message['diff'];
 329                 } elseif ( !self::userCan( $rc, Revision::DELETED_TEXT, $this->getUser() ) ) {
 330                         $diffLink = $this->message['diff'];
 331                 } else {
 332                         $query = array(
 333                                 'curid' => $rc->mAttribs['rc_cur_id'],
 334                                 'diff' => $rc->mAttribs['rc_this_oldid'],
 335                                 'oldid' => $rc->mAttribs['rc_last_oldid']
 336                         );
 337
 338                         $diffLink = Linker::linkKnown(
 339                                 $rc->getTitle(),
 340                                 $this->message['diff'],
 341                                 array( 'tabindex' => $rc->counter ),
 342                                 $query
 343                         );
 344                 }
 345                 if ( $rc->mAttribs['rc_type'] == RC_CATEGORIZE ) {
 346                         $diffhist = $diffLink . $this->message['pipe-separator'] . $this->message['hist'];
 347                 } else {
 348                         $diffhist = $diffLink . $this->message['pipe-separator'];
 349                         # History link
 350                         $diffhist .= Linker::linkKnown(
 351                                 $rc->getTitle(),
 352                                 $this->message['hist'],
 353                                 array(),
 354                                 array(
 355                                         'curid' => $rc->mAttribs['rc_cur_id'],
 356                                         'action' => 'history'
 357                                 )
 358                         );
 359                 }
 360
 361                 // @todo FIXME: Hard coded ". .". Is there a message for this? Should there be?
 362                 $s .= $this->msg( 'parentheses' )->rawParams( $diffhist )->escaped() .
 363                         ' <span class="mw-changeslist-separator">. .</span> ';
 364         }
 365
 366         /**
 367          * @param string $s Article link will be appended to this string, in place.
 368          * @param RecentChange $rc
 369          * @param bool $unpatrolled
 370          * @param bool $watched
 371          * @deprecated since 1.27, use getArticleLink instead.
 372          */
 373         public function insertArticleLink( &$s, RecentChange $rc, $unpatrolled, $watched ) {
 374                 $s .= $this->getArticleLink( $rc, $unpatrolled, $watched );
 375         }
 376
 377         /**
 378          * @param RecentChange $rc
 379          * @param bool $unpatrolled
 380          * @param bool $watched
 381          * @return string HTML
 382          * @since 1.26
 383          */
 384         public function getArticleLink( &$rc, $unpatrolled, $watched ) {
 385                 $params = array();
 386                 if ( $rc->getTitle()->isRedirect() ) {
 387                         $params = array( 'redirect' => 'no' );
 388                 }
 389
 390                 $articlelink = Linker::linkKnown(
 391                         $rc->getTitle(),
 392                         null,
 393                         array( 'class' => 'mw-changeslist-title' ),
 394                         $params
 395                 );
 396                 if ( $this->isDeleted( $rc, Revision::DELETED_TEXT ) ) {
 397                         $articlelink = '<span class="history-deleted">' . $articlelink . '</span>';
 398                 }
 399                 # To allow for boldening pages watched by this user
 400                 $articlelink = "<span class=\"mw-title\">{$articlelink}</span>";
 401                 # RTL/LTR marker
 402                 $articlelink .= $this->getLanguage()->getDirMark();
 403
 404                 # TODO: Deprecate the $s argument, it seems happily unused.
 405                 $s = '';
 406                 Hooks::run( 'ChangesListInsertArticleLink',
 407                         array( &$this, &$articlelink, &$s, &$rc, $unpatrolled, $watched ) );
 408
 409                 return "{$s} {$articlelink}";
 410         }
 411
 412         /**
 413          * Get the timestamp from $rc formatted with current user's settings
 414          * and a separator
 415          *
 416          * @param RecentChange $rc
 417          * @return string HTML fragment
 418          */
 419         public function getTimestamp( $rc ) {
 420                 // @todo FIXME: Hard coded ". .". Is there a message for this? Should there be?
 421                 return $this->message['semicolon-separator'] . '<span class="mw-changeslist-date">' .
 422                         $this->getLanguage()->userTime(
 423                                 $rc->mAttribs['rc_timestamp'],
 424                                 $this->getUser()
 425                         ) . '</span> <span class="mw-changeslist-separator">. .</span> ';
 426         }
 427
 428         /**
 429          * Insert time timestamp string from $rc into $s
 430          *
 431          * @param string $s HTML to update
 432          * @param RecentChange $rc
 433          */
 434         public function insertTimestamp( &$s, $rc ) {
 435                 $s .= $this->getTimestamp( $rc );
 436         }
 437
 438         /**
 439          * Insert links to user page, user talk page and eventually a blocking link
 440          *
 441          * @param string &$s HTML to update
 442          * @param RecentChange &$rc
 443          */
 444         public function insertUserRelatedLinks( &$s, &$rc ) {
 445                 if ( $this->isDeleted( $rc, Revision::DELETED_USER ) ) {
 446                         $s .= ' <span class="history-deleted">' .
 447                                 $this->msg( 'rev-deleted-user' )->escaped() . '</span>';
 448                 } else {
 449                         $s .= $this->getLanguage()->getDirMark() . Linker::userLink( $rc->mAttribs['rc_user'],
 450                                 $rc->mAttribs['rc_user_text'] );
 451                         $s .= Linker::userToolLinks( $rc->mAttribs['rc_user'], $rc->mAttribs['rc_user_text'] );
 452                 }
 453         }
 454
 455         /**
 456          * Insert a formatted action
 457          *
 458          * @param RecentChange $rc
 459          * @return string
 460          */
 461         public function insertLogEntry( $rc ) {
 462                 $formatter = LogFormatter::newFromRow( $rc->mAttribs );
 463                 $formatter->setContext( $this->getContext() );
 464                 $formatter->setShowUserToolLinks( true );
 465                 $mark = $this->getLanguage()->getDirMark();
 466
 467                 return $formatter->getActionText() . " $mark" . $formatter->getComment();
 468         }
 469
 470         /**
 471          * Insert a formatted comment
 472          * @param RecentChange $rc
 473          * @return string
 474          */
 475         public function insertComment( $rc ) {
 476                 if ( $this->isDeleted( $rc, Revision::DELETED_COMMENT ) ) {
 477                         return ' <span class="history-deleted">' .
 478                                 $this->msg( 'rev-deleted-comment' )->escaped() . '</span>';
 479                 } else {
 480                         return Linker::commentBlock( $rc->mAttribs['rc_comment'], $rc->getTitle() );
 481                 }
 482         }
 483
 484         /**
 485          * Check whether to enable recent changes patrol features
 486          *
 487          * @deprecated since 1.22
 488          * @return bool
 489          */
 490         public static function usePatrol() {
 491                 global $wgUser;
 492
 493                 wfDeprecated( __METHOD__, '1.22' );
 494
 495                 return $wgUser->useRCPatrol();
 496         }
 497
 498         /**
 499          * Returns the string which indicates the number of watching users
 500          * @param int $count Number of user watching a page
 501          * @return string
 502          */
 503         protected function numberofWatchingusers( $count ) {
 504                 if ( $count <= 0 ) {
 505                         return '';
 506                 }
 507                 $cache = $this->watchMsgCache;
 508                 $that = $this;
 509                 return $cache->getWithSetCallback( $count, $cache::TTL_INDEFINITE,
 510                         function () use ( $that, $count ) {
 511                                 return $that->msg( 'number_of_watching_users_RCview' )
 512                                         ->numParams( $count )->escaped();
 513                         }
 514                 );
 515         }
 516
 517         /**
 518          * Determine if said field of a revision is hidden
 519          * @param RCCacheEntry|RecentChange $rc
 520          * @param int $field One of DELETED_* bitfield constants
 521          * @return bool
 522          */
 523         public static function isDeleted( $rc, $field ) {
 524                 return ( $rc->mAttribs['rc_deleted'] & $field ) == $field;
 525         }
 526
 527         /**
 528          * Determine if the current user is allowed to view a particular
 529          * field of this revision, if it's marked as deleted.
 530          * @param RCCacheEntry|RecentChange $rc
 531          * @param int $field
 532          * @param User $user User object to check, or null to use $wgUser
 533          * @return bool
 534          */
 535         public static function userCan( $rc, $field, User $user = null ) {
 536                 if ( $rc->mAttribs['rc_type'] == RC_LOG ) {
 537                         return LogEventsList::userCanBitfield( $rc->mAttribs['rc_deleted'], $field, $user );
 538                 } else {
 539                         return Revision::userCanBitfield( $rc->mAttribs['rc_deleted'], $field, $user );
 540                 }
 541         }
 542
 543         /**
 544          * @param string $link
 545          * @param bool $watched
 546          * @return string
 547          */
 548         protected function maybeWatchedLink( $link, $watched = false ) {
 549                 if ( $watched ) {
 550                         return '<strong class="mw-watched">' . $link . '</strong>';
 551                 } else {
 552                         return '<span class="mw-rc-unwatched">' . $link . '</span>';
 553                 }
 554         }
 555
 556         /** Inserts a rollback link
 557          *
 558          * @param string $s
 559          * @param RecentChange $rc
 560          */
 561         public function insertRollback( &$s, &$rc ) {
 562                 if ( $rc->mAttribs['rc_type'] == RC_EDIT
 563                         && $rc->mAttribs['rc_this_oldid']
 564                         && $rc->mAttribs['rc_cur_id']
 565                 ) {
 566                         $page = $rc->getTitle();
 567                         /** Check for rollback and edit permissions, disallow special pages, and only
 568                          * show a link on the top-most revision */
 569                         if ( $this->getUser()->isAllowed( 'rollback' )
 570                                 && $rc->mAttribs['page_latest'] == $rc->mAttribs['rc_this_oldid']
 571                         ) {
 572                                 $rev = new Revision( array(
 573                                         'title' => $page,
 574                                         'id' => $rc->mAttribs['rc_this_oldid'],
 575                                         'user' => $rc->mAttribs['rc_user'],
 576                                         'user_text' => $rc->mAttribs['rc_user_text'],
 577                                         'deleted' => $rc->mAttribs['rc_deleted']
 578                                 ) );
 579                                 $s .= ' ' . Linker::generateRollback( $rev, $this->getContext() );
 580                         }
 581                 }
 582         }
 583
 584         /**
 585          * @param RecentChange $rc
 586          * @return string
 587          * @since 1.26
 588          */
 589         public function getRollback( RecentChange $rc ) {
 590                 $s = '';
 591                 $this->insertRollback( $s, $rc );
 592                 return $s;
 593         }
 594
 595         /**
 596          * @param string $s
 597          * @param RecentChange $rc
 598          * @param array $classes
 599          */
 600         public function insertTags( &$s, &$rc, &$classes ) {
 601                 if ( empty( $rc->mAttribs['ts_tags'] ) ) {
 602                         return;
 603                 }
 604
 605                 list( $tagSummary, $newClasses ) = ChangeTags::formatSummaryRow(
 606                         $rc->mAttribs['ts_tags'],
 607                         'changeslist'
 608                 );
 609                 $classes = array_merge( $classes, $newClasses );
 610                 $s .= ' ' . $tagSummary;
 611         }
 612
 613         /**
 614          * @param RecentChange $rc
 615          * @param array $classes
 616          * @return string
 617          * @since 1.26
 618          */
 619         public function getTags( RecentChange $rc, array &$classes ) {
 620                 $s = '';
 621                 $this->insertTags( $s, $rc, $classes );
 622                 return $s;
 623         }
 624
 625         public function insertExtra( &$s, &$rc, &$classes ) {
 626                 // Empty, used for subclasses to add anything special.
 627         }
 628
 629         protected function showAsUnpatrolled( RecentChange $rc ) {
 630                 return self::isUnpatrolled( $rc, $this->getUser() );
 631         }
 632
 633         /**
 634          * @param object|RecentChange $rc Database row from recentchanges or a RecentChange object
 635          * @param User $user
 636          * @return bool
 637          */
 638         public static function isUnpatrolled( $rc, User $user ) {
 639                 if ( $rc instanceof RecentChange ) {
 640                         $isPatrolled = $rc->mAttribs['rc_patrolled'];
 641                         $rcType = $rc->mAttribs['rc_type'];
 642                 } else {
 643                         $isPatrolled = $rc->rc_patrolled;
 644                         $rcType = $rc->rc_type;
 645                 }
 646
 647                 if ( !$isPatrolled ) {
 648                         if ( $user->useRCPatrol() ) {
 649                                 return true;
 650                         }
 651                         if ( $user->useNPPatrol() && $rcType == RC_NEW ) {
 652                                 return true;
 653                         }
 654                 }
 655
 656                 return false;
 657         }
 658
 659         /**
 660          * Determines whether a revision is linked to this change; this may not be the case
 661          * when the categorization wasn't done by an edit but a conditional parser function
 662          *
 663          * @since 1.27
 664          *
 665          * @param RecentChange|RCCacheEntry $rcObj
 666          * @return bool
 667          */
 668         protected function isCategorizationWithoutRevision( $rcObj ) {
 669                 return intval( $rcObj->getAttribute( 'rc_type' ) ) === RC_CATEGORIZE
 670                         && intval( $rcObj->getAttribute( 'rc_this_oldid' ) ) === 0;
 671         }
 672
 673 }