includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @file
   5  */
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * See design.txt for an overview.
  11  * Note: edit user interface and cache support functions have been
  12  * moved to separate EditPage and HTMLFileCache classes.
  13  *
  14  */
  15 class Article {
  16         /**@{{
  17          * @private
  18          */
  19         var $mComment = '';               //!<
  20         var $mContent;                    //!<
  21         var $mContentLoaded = false;      //!<
  22         var $mCounter = -1;               //!< Not loaded
  23         var $mCurID = -1;                 //!< Not loaded
  24         var $mDataLoaded = false;         //!<
  25         var $mForUpdate = false;          //!<
  26         var $mGoodAdjustment = 0;         //!<
  27         var $mIsRedirect = false;         //!<
  28         var $mLatest = false;             //!<
  29         var $mMinorEdit;                  //!<
  30         var $mOldId;                      //!<
  31         var $mPreparedEdit = false;       //!< Title object if set
  32         var $mRedirectedFrom = null;      //!< Title object if set
  33         var $mRedirectTarget = null;      //!< Title object if set
  34         var $mRedirectUrl = false;        //!<
  35         var $mRevIdFetched = 0;           //!<
  36         var $mRevision;                   //!<
  37         var $mTimestamp = '';             //!<
  38         var $mTitle;                      //!<
  39         var $mTotalAdjustment = 0;        //!<
  40         var $mTouched = '19700101000000'; //!<
  41         var $mUser = -1;                  //!< Not loaded
  42         var $mUserText = '';              //!<
  43         var $mParserOptions;              //!<
  44         var $mParserOutput;               //!<
  45         /**@}}*/
  46
  47         /**
  48          * Constructor and clear the article
  49          * @param $title Reference to a Title object.
  50          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  51          */
  52         public function __construct( Title $title, $oldId = null ) {
  53                 $this->mTitle =& $title;
  54                 $this->mOldId = $oldId;
  55         }
  56
  57         /**
  58          * Constructor from an article article
  59          * @param $id The article ID to load
  60          */
  61         public static function newFromID( $id ) {
  62                 $t = Title::newFromID( $id );
  63                 return $t == null ? null : new Article( $t );
  64         }
  65
  66         /**
  67          * Tell the page view functions that this view was redirected
  68          * from another page on the wiki.
  69          * @param $from Title object.
  70          */
  71         public function setRedirectedFrom( $from ) {
  72                 $this->mRedirectedFrom = $from;
  73         }
  74
  75         /**
  76          * If this page is a redirect, get its target
  77          *
  78          * The target will be fetched from the redirect table if possible.
  79          * If this page doesn't have an entry there, call insertRedirect()
  80          * @return mixed Title object, or null if this page is not a redirect
  81          */
  82         public function getRedirectTarget() {
  83                 if( !$this->mTitle || !$this->mTitle->isRedirect() )
  84                         return null;
  85                 if( !is_null($this->mRedirectTarget) )
  86                         return $this->mRedirectTarget;
  87                 # Query the redirect table
  88                 $dbr = wfGetDB( DB_SLAVE );
  89                 $row = $dbr->selectRow( 'redirect',
  90                         array('rd_namespace', 'rd_title'),
  91                         array('rd_from' => $this->getID() ),
  92                         __METHOD__
  93                 );
  94                 if( $row ) {
  95                         return $this->mRedirectTarget = Title::makeTitle($row->rd_namespace, $row->rd_title);
  96                 }
  97                 # This page doesn't have an entry in the redirect table
  98                 return $this->mRedirectTarget = $this->insertRedirect();
  99         }
 100
 101         /**
 102          * Insert an entry for this page into the redirect table.
 103          *
 104          * Don't call this function directly unless you know what you're doing.
 105          * @return Title object
 106          */
 107         public function insertRedirect() {
 108                 $retval = Title::newFromRedirect( $this->getContent() );
 109                 if( !$retval ) {
 110                         return null;
 111                 }
 112                 $dbw = wfGetDB( DB_MASTER );
 113                 $dbw->replace( 'redirect', array('rd_from'),
 114                         array(
 115                                 'rd_from' => $this->getID(),
 116                                 'rd_namespace' => $retval->getNamespace(),
 117                                 'rd_title' => $retval->getDBkey()
 118                         ),
 119                         __METHOD__
 120                 );
 121                 return $retval;
 122         }
 123
 124         /**
 125          * Get the Title object this page redirects to
 126          *
 127          * @return mixed false, Title of in-wiki target, or string with URL
 128          */
 129         public function followRedirect() {
 130                 $text = $this->getContent();
 131                 return $this->followRedirectText( $text );
 132         }
 133
 134         /**
 135          * Get the Title object this text redirects to
 136          *
 137          * @return mixed false, Title of in-wiki target, or string with URL
 138          */
 139         public function followRedirectText( $text ) {
 140                 $rt = Title::newFromRedirectRecurse( $text ); // recurse through to only get the final target
 141                 # process if title object is valid and not special:userlogout
 142                 if( $rt ) {
 143                         if( $rt->getInterwiki() != '' ) {
 144                                 if( $rt->isLocal() ) {
 145                                         // Offsite wikis need an HTTP redirect.
 146                                         //
 147                                         // This can be hard to reverse and may produce loops,
 148                                         // so they may be disabled in the site configuration.
 149                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 150                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 151                                 }
 152                         } else {
 153                                 if( $rt->getNamespace() == NS_SPECIAL ) {
 154                                         // Gotta handle redirects to special pages differently:
 155                                         // Fill the HTTP response "Location" header and ignore
 156                                         // the rest of the page we're on.
 157                                         //
 158                                         // This can be hard to reverse, so they may be disabled.
 159                                         if( $rt->isSpecial( 'Userlogout' ) ) {
 160                                                 // rolleyes
 161                                         } else {
 162                                                 return $rt->getFullURL();
 163                                         }
 164                                 }
 165                                 return $rt;
 166                         }
 167                 }
 168                 // No or invalid redirect
 169                 return false;
 170         }
 171
 172         /**
 173          * get the title object of the article
 174          */
 175         public function getTitle() {
 176                 return $this->mTitle;
 177         }
 178
 179         /**
 180          * Clear the object
 181          * @private
 182          */
 183         public function clear() {
 184                 $this->mDataLoaded    = false;
 185                 $this->mContentLoaded = false;
 186
 187                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 188                 $this->mRedirectedFrom = null; # Title object if set
 189                 $this->mRedirectTarget = null; # Title object if set
 190                 $this->mUserText =
 191                 $this->mTimestamp = $this->mComment = '';
 192                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 193                 $this->mTouched = '19700101000000';
 194                 $this->mForUpdate = false;
 195                 $this->mIsRedirect = false;
 196                 $this->mRevIdFetched = 0;
 197                 $this->mRedirectUrl = false;
 198                 $this->mLatest = false;
 199                 $this->mPreparedEdit = false;
 200         }
 201
 202         /**
 203          * Note that getContent/loadContent do not follow redirects anymore.
 204          * If you need to fetch redirectable content easily, try
 205          * the shortcut in Article::followContent()
 206          *
 207          * @return Return the text of this revision
 208         */
 209         public function getContent() {
 210                 global $wgUser, $wgContLang, $wgOut, $wgMessageCache;
 211                 wfProfileIn( __METHOD__ );
 212                 if( $this->getID() === 0 ) {
 213                         # If this is a MediaWiki:x message, then load the messages
 214                         # and return the message value for x.
 215                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 216                                 # If this is a system message, get the default text.
 217                                 list( $message, $lang ) = $wgMessageCache->figureMessage( $wgContLang->lcfirst( $this->mTitle->getText() ) );
 218                                 $wgMessageCache->loadAllMessages( $lang );
 219                                 $text = wfMsgGetKey( $message, false, $lang, false );
 220                                 if( wfEmptyMsg( $message, $text ) )
 221                                         $text = '';
 222                         } else {
 223                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 224                         }
 225                         wfProfileOut( __METHOD__ );
 226                         return $text;
 227                 } else {
 228                         $this->loadContent();
 229                         wfProfileOut( __METHOD__ );
 230                         return $this->mContent;
 231                 }
 232         }
 233
 234         /**
 235          * Get the text of the current revision. No side-effects...
 236          *
 237          * @return Return the text of the current revision
 238         */
 239         public function getRawText() {
 240                 // Check process cache for current revision
 241                 if( $this->mContentLoaded && $this->mOldId == 0 ) {
 242                         return $this->mContent;
 243                 }
 244                 $rev = Revision::newFromTitle( $this->mTitle );
 245                 $text = $rev ? $rev->getRawText() : false;
 246                 return $text;
 247         }
 248
 249         /**
 250          * This function returns the text of a section, specified by a number ($section).
 251          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 252          * the first section before any such heading (section 0).
 253          *
 254          * If a section contains subsections, these are also returned.
 255          *
 256          * @param $text String: text to look in
 257          * @param $section Integer: section number
 258          * @return string text of the requested section
 259          * @deprecated
 260          */
 261         public function getSection( $text, $section ) {
 262                 global $wgParser;
 263                 return $wgParser->getSection( $text, $section );
 264         }
 265
 266         /**
 267          * Get the text that needs to be saved in order to undo all revisions
 268          * between $undo and $undoafter. Revisions must belong to the same page,
 269          * must exist and must not be deleted
 270          * @param $undo Revision
 271          * @param $undoafter Revision Must be an earlier revision than $undo
 272          * @return mixed string on success, false on failure
 273          */
 274         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 275                 $undo_text = $undo->getText();
 276                 $undoafter_text = $undoafter->getText();
 277                 $cur_text = $this->getContent();
 278                 if ( $cur_text == $undo_text ) {
 279                         # No use doing a merge if it's just a straight revert.
 280                         return $undoafter_text;
 281                 }
 282                 $undone_text = '';
 283                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) )
 284                         return false;
 285                 return $undone_text;
 286         }
 287
 288         /**
 289          * @return int The oldid of the article that is to be shown, 0 for the
 290          *             current revision
 291          */
 292         public function getOldID() {
 293                 if( is_null( $this->mOldId ) ) {
 294                         $this->mOldId = $this->getOldIDFromRequest();
 295                 }
 296                 return $this->mOldId;
 297         }
 298
 299         /**
 300          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 301          *
 302          * @return int The old id for the request
 303          */
 304         public function getOldIDFromRequest() {
 305                 global $wgRequest;
 306                 $this->mRedirectUrl = false;
 307                 $oldid = $wgRequest->getVal( 'oldid' );
 308                 if( isset( $oldid ) ) {
 309                         $oldid = intval( $oldid );
 310                         if( $wgRequest->getVal( 'direction' ) == 'next' ) {
 311                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 312                                 if( $nextid  ) {
 313                                         $oldid = $nextid;
 314                                 } else {
 315                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 316                                 }
 317                         } elseif( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 318                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 319                                 if( $previd ) {
 320                                         $oldid = $previd;
 321                                 }
 322                         }
 323                 }
 324                 if( !$oldid ) {
 325                         $oldid = 0;
 326                 }
 327                 return $oldid;
 328         }
 329
 330         /**
 331          * Load the revision (including text) into this object
 332          */
 333         function loadContent() {
 334                 if( $this->mContentLoaded ) return;
 335                 wfProfileIn( __METHOD__ );
 336                 # Query variables :P
 337                 $oldid = $this->getOldID();
 338                 # Pre-fill content with error message so that if something
 339                 # fails we'll have something telling us what we intended.
 340                 $this->mOldId = $oldid;
 341                 $this->fetchContent( $oldid );
 342                 wfProfileOut( __METHOD__ );
 343         }
 344
 345
 346         /**
 347          * Fetch a page record with the given conditions
 348          * @param $dbr Database object
 349          * @param $conditions Array
 350          */
 351         protected function pageData( $dbr, $conditions ) {
 352                 $fields = array(
 353                                 'page_id',
 354                                 'page_namespace',
 355                                 'page_title',
 356                                 'page_restrictions',
 357                                 'page_counter',
 358                                 'page_is_redirect',
 359                                 'page_is_new',
 360                                 'page_random',
 361                                 'page_touched',
 362                                 'page_latest',
 363                                 'page_len',
 364                 );
 365                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 366                 $row = $dbr->selectRow(
 367                         'page',
 368                         $fields,
 369                         $conditions,
 370                         __METHOD__
 371                 );
 372                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 373                 return $row ;
 374         }
 375
 376         /**
 377          * @param $dbr Database object
 378          * @param $title Title object
 379          */
 380         public function pageDataFromTitle( $dbr, $title ) {
 381                 return $this->pageData( $dbr, array(
 382                         'page_namespace' => $title->getNamespace(),
 383                         'page_title'     => $title->getDBkey() ) );
 384         }
 385
 386         /**
 387          * @param $dbr Database
 388          * @param $id Integer
 389          */
 390         protected function pageDataFromId( $dbr, $id ) {
 391                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 392         }
 393
 394         /**
 395          * Set the general counter, title etc data loaded from
 396          * some source.
 397          *
 398          * @param $data Database row object or "fromdb"
 399          */
 400         public function loadPageData( $data = 'fromdb' ) {
 401                 if( $data === 'fromdb' ) {
 402                         $dbr = wfGetDB( DB_MASTER );
 403                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 404                 }
 405
 406                 $lc = LinkCache::singleton();
 407                 if( $data ) {
 408                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 409
 410                         $this->mTitle->mArticleID = intval( $data->page_id );
 411
 412                         # Old-fashioned restrictions
 413                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 414
 415                         $this->mCounter     = intval( $data->page_counter );
 416                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 417                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 418                         $this->mLatest      = intval( $data->page_latest );
 419                 } else {
 420                         if( is_object( $this->mTitle ) ) {
 421                                 $lc->addBadLinkObj( $this->mTitle );
 422                         }
 423                         $this->mTitle->mArticleID = 0;
 424                 }
 425
 426                 $this->mDataLoaded  = true;
 427         }
 428
 429         /**
 430          * Get text of an article from database
 431          * Does *NOT* follow redirects.
 432          * @param $oldid Int: 0 for whatever the latest revision is
 433          * @return string
 434          */
 435         function fetchContent( $oldid = 0 ) {
 436                 if( $this->mContentLoaded ) {
 437                         return $this->mContent;
 438                 }
 439
 440                 $dbr = wfGetDB( DB_MASTER );
 441
 442                 # Pre-fill content with error message so that if something
 443                 # fails we'll have something telling us what we intended.
 444                 $t = $this->mTitle->getPrefixedText();
 445                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 446                 $this->mContent = wfMsg( 'missing-article', $t, $d ) ;
 447
 448                 if( $oldid ) {
 449                         $revision = Revision::newFromId( $oldid );
 450                         if( is_null( $revision ) ) {
 451                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 452                                 return false;
 453                         }
 454                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 455                         if( !$data ) {
 456                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 457                                 return false;
 458                         }
 459                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 460                         $this->loadPageData( $data );
 461                 } else {
 462                         if( !$this->mDataLoaded ) {
 463                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 464                                 if( !$data ) {
 465                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 466                                         return false;
 467                                 }
 468                                 $this->loadPageData( $data );
 469                         }
 470                         $revision = Revision::newFromId( $this->mLatest );
 471                         if( is_null( $revision ) ) {
 472                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$this->mLatest}\n" );
 473                                 return false;
 474                         }
 475                 }
 476
 477                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 478                 // We should instead work with the Revision object when we need it...
 479                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 480
 481                 $this->mUser      = $revision->getUser();
 482                 $this->mUserText  = $revision->getUserText();
 483                 $this->mComment   = $revision->getComment();
 484                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 485
 486                 $this->mRevIdFetched = $revision->getId();
 487                 $this->mContentLoaded = true;
 488                 $this->mRevision =& $revision;
 489
 490                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 491
 492                 return $this->mContent;
 493         }
 494
 495         /**
 496          * Read/write accessor to select FOR UPDATE
 497          *
 498          * @param $x Mixed: FIXME
 499          */
 500         public function forUpdate( $x = NULL ) {
 501                 return wfSetVar( $this->mForUpdate, $x );
 502         }
 503
 504         /**
 505          * Get the database which should be used for reads
 506          *
 507          * @return Database
 508          * @deprecated - just call wfGetDB( DB_MASTER ) instead
 509          */
 510         function getDB() {
 511                 wfDeprecated( __METHOD__ );
 512                 return wfGetDB( DB_MASTER );
 513         }
 514
 515         /**
 516          * Get options for all SELECT statements
 517          *
 518          * @param $options Array: an optional options array which'll be appended to
 519          *                       the default
 520          * @return Array: options
 521          */
 522         protected function getSelectOptions( $options = '' ) {
 523                 if( $this->mForUpdate ) {
 524                         if( is_array( $options ) ) {
 525                                 $options[] = 'FOR UPDATE';
 526                         } else {
 527                                 $options = 'FOR UPDATE';
 528                         }
 529                 }
 530                 return $options;
 531         }
 532
 533         /**
 534          * @return int Page ID
 535          */
 536         public function getID() {
 537                 if( $this->mTitle ) {
 538                         return $this->mTitle->getArticleID();
 539                 } else {
 540                         return 0;
 541                 }
 542         }
 543
 544         /**
 545          * @return bool Whether or not the page exists in the database
 546          */
 547         public function exists() {
 548                 return $this->getId() > 0;
 549         }
 550
 551         /**
 552          * Check if this page is something we're going to be showing
 553          * some sort of sensible content for. If we return false, page
 554          * views (plain action=view) will return an HTTP 404 response,
 555          * so spiders and robots can know they're following a bad link.
 556          *
 557          * @return bool
 558          */
 559         public function hasViewableContent() {
 560                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 561         }
 562
 563         /**
 564          * @return int The view count for the page
 565          */
 566         public function getCount() {
 567                 if( -1 == $this->mCounter ) {
 568                         $id = $this->getID();
 569                         if( $id == 0 ) {
 570                                 $this->mCounter = 0;
 571                         } else {
 572                                 $dbr = wfGetDB( DB_SLAVE );
 573                                 $this->mCounter = $dbr->selectField( 'page',
 574                                         'page_counter',
 575                                         array( 'page_id' => $id ),
 576                                         __METHOD__,
 577                                         $this->getSelectOptions()
 578                                 );
 579                         }
 580                 }
 581                 return $this->mCounter;
 582         }
 583
 584         /**
 585          * Determine whether a page  would be suitable for being counted as an
 586          * article in the site_stats table based on the title & its content
 587          *
 588          * @param $text String: text to analyze
 589          * @return bool
 590          */
 591         public function isCountable( $text ) {
 592                 global $wgUseCommaCount;
 593
 594                 $token = $wgUseCommaCount ? ',' : '[[';
 595                 return $this->mTitle->isContentPage() && !$this->isRedirect($text) && in_string($token,$text);
 596         }
 597
 598         /**
 599          * Tests if the article text represents a redirect
 600          *
 601          * @param $text String: FIXME
 602          * @return bool
 603          */
 604         public function isRedirect( $text = false ) {
 605                 if( $text === false ) {
 606                         if( $this->mDataLoaded ) {
 607                                 return $this->mIsRedirect;
 608                         }
 609                         // Apparently loadPageData was never called
 610                         $this->loadContent();
 611                         $titleObj = Title::newFromRedirectRecurse( $this->fetchContent() );
 612                 } else {
 613                         $titleObj = Title::newFromRedirect( $text );
 614                 }
 615                 return $titleObj !== NULL;
 616         }
 617
 618         /**
 619          * Returns true if the currently-referenced revision is the current edit
 620          * to this page (and it exists).
 621          * @return bool
 622          */
 623         public function isCurrent() {
 624                 # If no oldid, this is the current version.
 625                 if( $this->getOldID() == 0 ) {
 626                         return true;
 627                 }
 628                 return $this->exists() && isset($this->mRevision) && $this->mRevision->isCurrent();
 629         }
 630
 631         /**
 632          * Loads everything except the text
 633          * This isn't necessary for all uses, so it's only done if needed.
 634          */
 635         protected function loadLastEdit() {
 636                 if( -1 != $this->mUser )
 637                         return;
 638
 639                 # New or non-existent articles have no user information
 640                 $id = $this->getID();
 641                 if( 0 == $id ) return;
 642
 643                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 644                 if( !is_null( $this->mLastRevision ) ) {
 645                         $this->mUser      = $this->mLastRevision->getUser();
 646                         $this->mUserText  = $this->mLastRevision->getUserText();
 647                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 648                         $this->mComment   = $this->mLastRevision->getComment();
 649                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 650                         $this->mRevIdFetched = $this->mLastRevision->getId();
 651                 }
 652         }
 653
 654         public function getTimestamp() {
 655                 // Check if the field has been filled by ParserCache::get()
 656                 if( !$this->mTimestamp ) {
 657                         $this->loadLastEdit();
 658                 }
 659                 return wfTimestamp(TS_MW, $this->mTimestamp);
 660         }
 661
 662         public function getUser() {
 663                 $this->loadLastEdit();
 664                 return $this->mUser;
 665         }
 666
 667         public function getUserText() {
 668                 $this->loadLastEdit();
 669                 return $this->mUserText;
 670         }
 671
 672         public function getComment() {
 673                 $this->loadLastEdit();
 674                 return $this->mComment;
 675         }
 676
 677         public function getMinorEdit() {
 678                 $this->loadLastEdit();
 679                 return $this->mMinorEdit;
 680         }
 681
 682         /* Use this to fetch the rev ID used on page views */
 683         public function getRevIdFetched() {
 684                 $this->loadLastEdit();
 685                 return $this->mRevIdFetched;
 686         }
 687
 688         /**
 689          * @param $limit Integer: default 0.
 690          * @param $offset Integer: default 0.
 691          */
 692         public function getContributors($limit = 0, $offset = 0) {
 693                 # XXX: this is expensive; cache this info somewhere.
 694
 695                 $contribs = array();
 696                 $dbr = wfGetDB( DB_SLAVE );
 697                 $revTable = $dbr->tableName( 'revision' );
 698                 $userTable = $dbr->tableName( 'user' );
 699                 $user = $this->getUser();
 700                 $pageId = $this->getId();
 701
 702                 $deletedBit = $dbr->bitAnd('rev_deleted', Revision::DELETED_USER); // username hidden?
 703
 704                 $sql = "SELECT {$userTable}.*, MAX(rev_timestamp) as timestamp
 705                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 706                         WHERE rev_page = $pageId
 707                         AND rev_user != $user
 708                         AND $deletedBit = 0
 709                         GROUP BY rev_user, rev_user_text, user_real_name
 710                         ORDER BY timestamp DESC";
 711
 712                 if($limit > 0)
 713                         $sql = $dbr->limitResult($sql, $limit, $offset);
 714
 715                 $sql .= ' '. $this->getSelectOptions();
 716
 717                 $res = $dbr->query($sql, __METHOD__ );
 718
 719                 return new UserArrayFromResult( $res );
 720         }
 721
 722         /**
 723          * This is the default action of the index.php entry point: just view the
 724          * page of the given title.
 725         */
 726         public function view() {
 727                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 728                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 729                 global $wgUseTrackbacks;
 730
 731                 wfProfileIn( __METHOD__ );
 732
 733                 # Get variables from query string
 734                 $oldid = $this->getOldID();
 735                 $parserCache = ParserCache::singleton();
 736
 737                 $parserOptions = clone $this->getParserOptions();
 738                 # Render printable version, use printable version cache
 739                 if ( $wgOut->isPrintable() ) {
 740                         $parserOptions->setIsPrintable( true );
 741                 }
 742
 743                 # Try client and file cache
 744                 if( $oldid === 0 && $this->checkTouched() ) {
 745                         global $wgUseETag;
 746                         if( $wgUseETag ) {
 747                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 748                         }
 749                         # Is is client cached?
 750                         if( $wgOut->checkLastModified( $this->getTouched() ) ) {
 751                                 wfDebug( __METHOD__.": done 304\n" );
 752                                 wfProfileOut( __METHOD__ );
 753                                 return;
 754                         # Try file cache
 755                         } else if( $this->tryFileCache() ) {
 756                                 wfDebug( __METHOD__.": done file cache\n" );
 757                                 # tell wgOut that output is taken care of
 758                                 $wgOut->disable();
 759                                 $this->viewUpdates();
 760                                 wfProfileOut( __METHOD__ );
 761                                 return;
 762                         }
 763                 }
 764
 765                 $sk = $wgUser->getSkin();
 766
 767                 # getOldID may want us to redirect somewhere else
 768                 if( $this->mRedirectUrl ) {
 769                         $wgOut->redirect( $this->mRedirectUrl );
 770                         wfDebug( __METHOD__.": redirecting due to oldid\n" );
 771                         wfProfileOut( __METHOD__ );
 772                         return;
 773                 }
 774
 775                 $wgOut->setArticleFlag( true );
 776                 # Set page title (may be overridden by DISPLAYTITLE)
 777                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 778
 779                 # If we got diff in the query, we want to see a diff page instead of the article.
 780                 if( !is_null( $wgRequest->getVal( 'diff' ) ) ) {
 781                         wfDebug( __METHOD__.": showing diff page\n" );
 782                         $this->showDiffPage();
 783                         wfProfileOut( __METHOD__ );
 784                         return;
 785                 }
 786
 787                 # Should the parser cache be used?
 788                 $useParserCache = $this->useParserCache( $oldid );
 789                 wfDebug( 'Article::view using parser cache: ' . ($useParserCache ? 'yes' : 'no' ) . "\n" );
 790                 if( $wgUser->getOption( 'stubthreshold' ) ) {
 791                         wfIncrStats( 'pcache_miss_stub' );
 792                 }
 793
 794                 # For the main page, overwrite the <title> element with the con-
 795                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 796                 # that's not empty).
 797                 if( $this->mTitle->equals( Title::newMainPage() )
 798                         && wfMsgForContent( 'pagetitle-view-mainpage' ) !== '' )
 799                 {
 800                         $wgOut->setHTMLTitle( wfMsgForContent( 'pagetitle-view-mainpage' ) );
 801                 }
 802
 803                 $wasRedirected = $this->showRedirectedFromHeader();
 804                 $this->showNamespaceHeader();
 805
 806                 # Iterate through the possible ways of constructing the output text.
 807                 # Keep going until $outputDone is set, or we run out of things to do.
 808                 $pass = 0;
 809                 $outputDone = false;
 810                 while( !$outputDone && ++$pass ){
 811                         switch( $pass ){
 812                                 case 1:
 813                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 814                                         break;
 815
 816                                 case 2:
 817                                         # Try the parser cache
 818                                         if( $useParserCache ) {
 819                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 820                                                 if ( $this->mParserOutput !== false ) {
 821                                                         wfDebug( __METHOD__.": showing parser cache contents\n" );
 822                                                         $wgOut->addParserOutput( $this->mParserOutput );
 823                                                         # Ensure that UI elements requiring revision ID have
 824                                                         # the correct version information.
 825                                                         $wgOut->setRevisionId( $this->mLatest );
 826                                                         $outputDone = true;
 827                                                 }
 828                                         }
 829                                         break;
 830
 831                                 case 3:
 832                                         $text = $this->getContent();
 833                                         if( $text === false || $this->getID() == 0 ) {
 834                                                 wfDebug( __METHOD__.": showing missing article\n" );
 835                                                 $this->showMissingArticle();
 836                                                 wfProfileOut( __METHOD__ );
 837                                                 return;
 838                                         }
 839
 840                                         # Another whitelist check in case oldid is altering the title
 841                                         if( !$this->mTitle->userCanRead() ) {
 842                                                 wfDebug( __METHOD__.": denied on secondary read check\n" );
 843                                                 $wgOut->loginToUse();
 844                                                 $wgOut->output();
 845                                                 $wgOut->disable();
 846                                                 wfProfileOut( __METHOD__ );
 847                                                 return;
 848                                         }
 849
 850                                         # Are we looking at an old revision
 851                                         if( $oldid && !is_null( $this->mRevision ) ) {
 852                                                 $this->setOldSubtitle( $oldid );
 853                                                 if ( !$this->showDeletedRevisionHeader() ) {
 854                                                         wfDebug( __METHOD__.": cannot view deleted revision\n" );
 855                                                         wfProfileOut( __METHOD__ );
 856                                                         return;
 857                                                 }
 858                                                 # If this "old" version is the current, then try the parser cache...
 859                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
 860                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 861                                                         if ( $this->mParserOutput ) {
 862                                                                 wfDebug( __METHOD__.": showing parser cache for current rev permalink\n" );
 863                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 864                                                                 $wgOut->setRevisionId( $this->mLatest );
 865                                                                 $this->showViewFooter();
 866                                                                 $this->viewUpdates();
 867                                                                 wfProfileOut( __METHOD__ );
 868                                                                 return;
 869                                                         }
 870                                                 }
 871                                         }
 872
 873                                         # Ensure that UI elements requiring revision ID have
 874                                         # the correct version information.
 875                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 876
 877                                         # Pages containing custom CSS or JavaScript get special treatment
 878                                         if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 879                                                 wfDebug( __METHOD__.": showing CSS/JS source\n" );
 880                                                 $this->showCssOrJsPage();
 881                                                 $outputDone = true;
 882                                         } else if( $rt = Title::newFromRedirectArray( $text ) ) {
 883                                                 wfDebug( __METHOD__.": showing redirect=no page\n" );
 884                                                 # Viewing a redirect page (e.g. with parameter redirect=no)
 885                                                 # Don't append the subtitle if this was an old revision
 886                                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 887                                                 # Parse just to get categories, displaytitle, etc.
 888                                                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
 889                                                 $wgOut->addParserOutputNoText( $this->mParserOutput );
 890                                                 $outputDone = true;
 891                                         }
 892                                         break;
 893
 894                                 case 4:
 895                                         # Run the parse, protected by a pool counter
 896                                         wfDebug( __METHOD__.": doing uncached parse\n" );
 897                                         $key = $parserCache->getKey( $this, $parserOptions );
 898                                         $poolCounter = PoolCounter::factory( 'Article::view', $key );
 899                                         $dirtyCallback = $useParserCache ? array( $this, 'tryDirtyCache' ) : false;
 900                                         $status = $poolCounter->executeProtected( array( $this, 'doViewParse' ), $dirtyCallback );
 901
 902                                         if ( !$status->isOK() ) {
 903                                                 # Connection or timeout error
 904                                                 $this->showPoolError( $status );
 905                                                 wfProfileOut( __METHOD__ );
 906                                                 return;
 907                                         } else {
 908                                                 $outputDone = true;
 909                                         }
 910                                         break;
 911
 912                                 # Should be unreachable, but just in case...
 913                                 default:
 914                                         break 2;
 915                         }
 916                 }
 917
 918                 # Now that we've filled $this->mParserOutput, we know whether
 919                 # there are any __NOINDEX__ tags on the page
 920                 $policy = $this->getRobotPolicy( 'view' );
 921                 $wgOut->setIndexPolicy( $policy['index'] );
 922                 $wgOut->setFollowPolicy( $policy['follow'] );
 923
 924                 $this->showViewFooter();
 925                 $this->viewUpdates();
 926                 wfProfileOut( __METHOD__ );
 927         }
 928
 929         /**
 930          * Show a diff page according to current request variables. For use within
 931          * Article::view() only, other callers should use the DifferenceEngine class.
 932          */
 933         public function showDiffPage() {
 934                 global $wgOut, $wgRequest, $wgUser;
 935
 936                 $diff = $wgRequest->getVal( 'diff' );
 937                 $rcid = $wgRequest->getVal( 'rcid' );
 938                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 939                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 940                 $htmldiff = $wgRequest->getBool( 'htmldiff' );
 941                 $unhide = $wgRequest->getInt('unhide') == 1;
 942                 $oldid = $this->getOldID();
 943
 944                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $htmldiff, $unhide );
 945                 // DifferenceEngine directly fetched the revision:
 946                 $this->mRevIdFetched = $de->mNewid;
 947                 $de->showDiffPage( $diffOnly );
 948
 949                 // Needed to get the page's current revision
 950                 $this->loadPageData();
 951                 if( $diff == 0 || $diff == $this->mLatest ) {
 952                         # Run view updates for current revision only
 953                         $this->viewUpdates();
 954                 }
 955         }
 956
 957         /**
 958          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 959          * Article::view() only.
 960          *
 961          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
 962          * page views.
 963          */
 964         public function showCssOrJsPage() {
 965                 global $wgOut;
 966                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
 967                 // Give hooks a chance to customise the output
 968                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 969                         // Wrap the whole lot in a <pre> and don't parse
 970                         $m = array();
 971                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 972                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 973                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 974                         $wgOut->addHTML( "\n</pre>\n" );
 975                 }
 976         }
 977
 978         /**
 979          * Get the robot policy to be used for the current action=view request.
 980          * @return String the policy that should be set
 981          * @deprecated use getRobotPolicy() instead, which returns an associative
 982          *    array
 983          */
 984         public function getRobotPolicyForView() {
 985                 wfDeprecated( __FUNC__ );
 986                 $policy = $this->getRobotPolicy( 'view' );
 987                 return $policy['index'] . ',' . $policy['follow'];
 988         }
 989
 990         /**
 991          * Get the robot policy to be used for the current view
 992          * @param $action String the action= GET parameter
 993          * @return Array the policy that should be set
 994          * TODO: actions other than 'view'
 995          */
 996         public function getRobotPolicy( $action ){
 997
 998                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
 999                 global $wgDefaultRobotPolicy, $wgRequest;
1000
1001                 $ns = $this->mTitle->getNamespace();
1002                 if( $ns == NS_USER || $ns == NS_USER_TALK ) {
1003                         # Don't index user and user talk pages for blocked users (bug 11443)
1004                         if( !$this->mTitle->isSubpage() ) {
1005                                 $block = new Block();
1006                                 if( $block->load( $this->mTitle->getText() ) ) {
1007                                         return array( 'index'  => 'noindex',
1008                                                       'follow' => 'nofollow' );
1009                                 }
1010                         }
1011                 }
1012
1013                 if( $this->getID() === 0 || $this->getOldID() ) {
1014                         # Non-articles (special pages etc), and old revisions
1015                         return array( 'index'  => 'noindex',
1016                                       'follow' => 'nofollow' );
1017                 } elseif( $wgOut->isPrintable() ) {
1018                         # Discourage indexing of printable versions, but encourage following
1019                         return array( 'index'  => 'noindex',
1020                                       'follow' => 'follow' );
1021                 } elseif( $wgRequest->getInt('curid') ) {
1022                         # For ?curid=x urls, disallow indexing
1023                         return array( 'index'  => 'noindex',
1024                                       'follow' => 'follow' );
1025                 }
1026
1027                 # Otherwise, construct the policy based on the various config variables.
1028                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1029
1030                 if( isset( $wgNamespaceRobotPolicies[$ns] ) ){
1031                         # Honour customised robot policies for this namespace
1032                         $policy = array_merge( $policy,
1033                                                self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] ) );
1034                 }
1035                 if( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ){
1036                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1037                         # a final sanity check that we have really got the parser output.
1038                         $policy = array_merge( $policy,
1039                                                array( 'index' => $this->mParserOutput->getIndexPolicy() ) );
1040                 }
1041
1042                 if( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ){
1043                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1044                         $policy = array_merge( $policy,
1045                                                self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) );
1046                 }
1047
1048                 return $policy;
1049
1050         }
1051
1052         /**
1053          * Converts a String robot policy into an associative array, to allow
1054          * merging of several policies using array_merge().
1055          * @param $policy Mixed, returns empty array on null/false/'', transparent
1056          *            to already-converted arrays, converts String.
1057          * @return associative Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1058          */
1059         public static function formatRobotPolicy( $policy ){
1060                 if( is_array( $policy ) ){
1061                         return $policy;
1062                 } elseif( !$policy ){
1063                         return array();
1064                 }
1065
1066                 $policy = explode( ',', $policy );
1067                 $policy = array_map( 'trim', $policy );
1068
1069                 $arr = array();
1070                 foreach( $policy as $var ){
1071                         if( in_array( $var, array('index','noindex') ) ){
1072                                 $arr['index'] = $var;
1073                         } elseif( in_array( $var, array('follow','nofollow') ) ){
1074                                 $arr['follow'] = $var;
1075                         }
1076                 }
1077                 return $arr;
1078         }
1079
1080         /**
1081          * If this request is a redirect view, send "redirected from" subtitle to
1082          * $wgOut. Returns true if the header was needed, false if this is not a
1083          * redirect view. Handles both local and remote redirects.
1084          */
1085         public function showRedirectedFromHeader() {
1086                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1087
1088                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1089                 $sk = $wgUser->getSkin();
1090                 if( isset( $this->mRedirectedFrom ) ) {
1091                         // This is an internally redirected page view.
1092                         // We'll need a backlink to the source page for navigation.
1093                         if( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1094                                 $redir = $sk->link(
1095                                         $this->mRedirectedFrom,
1096                                         null,
1097                                         array(),
1098                                         array( 'redirect' => 'no' ),
1099                                         array( 'known', 'noclasses' )
1100                                 );
1101                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1102                                 $wgOut->setSubtitle( $s );
1103
1104                                 // Set the fragment if one was specified in the redirect
1105                                 if( strval( $this->mTitle->getFragment() ) != '' ) {
1106                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1107                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1108                                 }
1109
1110                                 // Add a <link rel="canonical"> tag
1111                                 $wgOut->addLink( array( 'rel' => 'canonical',
1112                                         'href' => $this->mTitle->getLocalURL() )
1113                                 );
1114                                 return true;
1115                         }
1116                 } elseif( $rdfrom ) {
1117                         // This is an externally redirected view, from some other wiki.
1118                         // If it was reported from a trusted site, supply a backlink.
1119                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1120                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
1121                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1122                                 $wgOut->setSubtitle( $s );
1123                                 return true;
1124                         }
1125                 }
1126                 return false;
1127         }
1128
1129         /**
1130          * Show a header specific to the namespace currently being viewed, like
1131          * [[MediaWiki:Talkpagetext]]. For Article::view().
1132          */
1133         public function showNamespaceHeader() {
1134                 global $wgOut;
1135                 if( $this->mTitle->isTalkPage() ) {
1136                         $msg = wfMsgNoTrans( 'talkpageheader' );
1137                         if ( $msg !== '-' && !wfEmptyMsg( 'talkpageheader', $msg ) ) {
1138                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1</div>", array( 'talkpageheader' ) );
1139                         }
1140                 }
1141         }
1142
1143         /**
1144          * Show the footer section of an ordinary page view
1145          */
1146         public function showViewFooter() {
1147                 global $wgOut, $wgUseTrackbacks, $wgRequest;
1148                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1149                 if( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1150                         $wgOut->addWikiMsg('anontalkpagetext');
1151                 }
1152
1153                 # If we have been passed an &rcid= parameter, we want to give the user a
1154                 # chance to mark this new article as patrolled.
1155                 $this->showPatrolFooter();
1156
1157                 # Trackbacks
1158                 if( $wgUseTrackbacks ) {
1159                         $this->addTrackbacks();
1160                 }
1161         }
1162
1163         /**
1164          * If patrol is possible, output a patrol UI box. This is called from the
1165          * footer section of ordinary page views. If patrol is not possible or not
1166          * desired, does nothing.
1167          */
1168         public function showPatrolFooter() {
1169                 global $wgOut, $wgRequest, $wgUser;
1170                 $rcid = $wgRequest->getVal( 'rcid' );
1171
1172                 if( !$rcid || !$this->mTitle->exists() || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1173                         return;
1174                 }
1175
1176                 $sk = $wgUser->getSkin();
1177
1178                 $wgOut->addHTML(
1179                         "<div class='patrollink'>" .
1180                                 wfMsgHtml(
1181                                         'markaspatrolledlink',
1182                                         $sk->link(
1183                                                 $this->mTitle,
1184                                                 wfMsgHtml( 'markaspatrolledtext' ),
1185                                                 array(),
1186                                                 array(
1187                                                         'action' => 'markpatrolled',
1188                                                         'rcid' => $rcid
1189                                                 ),
1190                                                 array( 'known', 'noclasses' )
1191                                         )
1192                                 ) .
1193                         '</div>'
1194                 );
1195         }
1196
1197         /**
1198          * Show the error text for a missing article. For articles in the MediaWiki
1199          * namespace, show the default message text. To be called from Article::view().
1200          */
1201         public function showMissingArticle() {
1202                 global $wgOut, $wgRequest;
1203                 # Show delete and move logs
1204                 $this->showLogs();
1205
1206                 # Show error message
1207                 $oldid = $this->getOldID();
1208                 if( $oldid ) {
1209                         $text = wfMsgNoTrans( 'missing-article',
1210                                 $this->mTitle->getPrefixedText(),
1211                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1212                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1213                         // Use the default message text
1214                         $text = $this->getContent();
1215                 } else {
1216                         if ( $this->mTitle->userCan( 'edit' ) )
1217                                 $text = wfMsgNoTrans( 'noarticletext' );
1218                         else
1219                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1220                 }
1221                 $text = "<div class='noarticletext'>\n$text\n</div>";
1222                 if( !$this->hasViewableContent() ) {
1223                         // If there's no backing content, send a 404 Not Found
1224                         // for better machine handling of broken links.
1225                         $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
1226                 }
1227                 $wgOut->addWikiText( $text );
1228         }
1229
1230         /**
1231          * If the revision requested for view is deleted, check permissions.
1232          * Send either an error message or a warning header to $wgOut.
1233          * Returns true if the view is allowed, false if not.
1234          */
1235         public function showDeletedRevisionHeader() {
1236                 global $wgOut, $wgRequest;
1237                 if( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1238                         // Not deleted
1239                         return true;
1240                 }
1241                 // If the user is not allowed to see it...
1242                 if( !$this->mRevision->userCan(Revision::DELETED_TEXT) ) {
1243                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
1244                                 'rev-deleted-text-permission' );
1245                         return false;
1246                 // If the user needs to confirm that they want to see it...
1247                 } else if( $wgRequest->getInt('unhide') != 1 ) {
1248                         # Give explanation and add a link to view the revision...
1249                         $oldid = intval( $this->getOldID() );
1250                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1251                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1252                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1253                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
1254                                 array($msg,$link) );
1255                         return false;
1256                 // We are allowed to see...
1257                 } else {
1258                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1259                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1260                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", $msg );
1261                         return true;
1262                 }
1263         }
1264
1265         /**
1266          * Show an excerpt from the deletion and move logs. To be called from the
1267          * header section on page views of missing pages.
1268          */
1269         public function showLogs() {
1270                 global $wgUser, $wgOut;
1271                 $loglist = new LogEventsList( $wgUser->getSkin(), $wgOut );
1272                 $pager = new LogPager( $loglist, array('move', 'delete'), false,
1273                         $this->mTitle->getPrefixedText(), '', array( "log_action != 'revision'" ) );
1274                 if( $pager->getNumRows() > 0 ) {
1275                         $pager->mLimit = 10;
1276                         $wgOut->addHTML( '<div class="mw-warning-with-logexcerpt">' );
1277                         $wgOut->addWikiMsg( 'moveddeleted-notice' );
1278                         $wgOut->addHTML(
1279                                 $loglist->beginLogEventsList() .
1280                                 $pager->getBody() .
1281                                 $loglist->endLogEventsList()
1282                         );
1283                         if( $pager->getNumRows() > 10 ) {
1284                                 $wgOut->addHTML( $wgUser->getSkin()->link(
1285                                         SpecialPage::getTitleFor( 'Log' ),
1286                                         wfMsgHtml( 'log-fulllog' ),
1287                                         array(),
1288                                         array( 'page' => $this->mTitle->getPrefixedText() )
1289                                 ) );
1290                         }
1291                         $wgOut->addHTML( '</div>' );
1292                 }
1293         }
1294
1295         /*
1296         * Should the parser cache be used?
1297         */
1298         public function useParserCache( $oldid ) {
1299                 global $wgUser, $wgEnableParserCache;
1300
1301                 return $wgEnableParserCache
1302                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
1303                         && $this->exists()
1304                         && empty( $oldid )
1305                         && !$this->mTitle->isCssOrJsPage()
1306                         && !$this->mTitle->isCssJsSubpage();
1307         }
1308
1309         /**
1310          * Execute the uncached parse for action=view
1311          */
1312         public function doViewParse() {
1313                 global $wgOut;
1314                 $oldid = $this->getOldID();
1315                 $useParserCache = $this->useParserCache( $oldid );
1316                 $parserOptions = clone $this->getParserOptions();
1317                 # Render printable version, use printable version cache
1318                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1319                 # Don't show section-edit links on old revisions... this way lies madness.
1320                 $parserOptions->setEditSection( $this->isCurrent() );
1321                 $useParserCache = $this->useParserCache( $oldid );
1322                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1323         }
1324
1325         /**
1326          * Try to fetch an expired entry from the parser cache. If it is present,
1327          * output it and return true. If it is not present, output nothing and
1328          * return false. This is used as a callback function for
1329          * PoolCounter::executeProtected().
1330          */
1331         public function tryDirtyCache() {
1332                 global $wgOut;
1333                 $parserCache = ParserCache::singleton();
1334                 $options = $this->getParserOptions();
1335                 $options->setIsPrintable( $wgOut->isPrintable() );
1336                 $output = $parserCache->getDirty( $this, $options );
1337                 if ( $output ) {
1338                         wfDebug( __METHOD__.": sending dirty output\n" );
1339                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1340                         $wgOut->setSquidMaxage( 0 );
1341                         $this->mParserOutput = $output;
1342                         $wgOut->addParserOutput( $output );
1343                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1344                         return true;
1345                 } else {
1346                         wfDebugLog( 'dirty', "dirty missing\n" );
1347                         wfDebug( __METHOD__.": no dirty cache\n" );
1348                         return false;
1349                 }
1350         }
1351
1352         /**
1353          * Show an error page for an error from the pool counter.
1354          * @param $status Status
1355          */
1356         public function showPoolError( $status ) {
1357                 global $wgOut;
1358                 $wgOut->clearHTML(); // for release() errors
1359                 $wgOut->enableClientCache( false );
1360                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1361                 $wgOut->addWikiText(
1362                         '<div class="errorbox">' .
1363                         $status->getWikiText( false, 'view-pool-error' ) .
1364                         '</div>'
1365                 );
1366         }
1367
1368         /**
1369          * View redirect
1370          * @param $target Title object or Array of destination(s) to redirect
1371          * @param $appendSubtitle Boolean [optional]
1372          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1373          */
1374         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1375                 global $wgParser, $wgOut, $wgContLang, $wgStylePath, $wgUser;
1376                 # Display redirect
1377                 if( !is_array( $target ) ) {
1378                         $target = array( $target );
1379                 }
1380                 $imageDir = $wgContLang->getDir();
1381                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1382                 $imageUrl2 = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1383                 $alt2 = $wgContLang->isRTL() ? '&larr;' : '&rarr;'; // should -> and <- be used instead of entities?
1384
1385                 if( $appendSubtitle ) {
1386                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1387                 }
1388                 $sk = $wgUser->getSkin();
1389                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1390                 $title = array_shift( $target );
1391                 if( $forceKnown ) {
1392                         $link = $sk->link(
1393                                 $title,
1394                                 htmlspecialchars( $title->getFullText() ),
1395                                 array(),
1396                                 array(),
1397                                 array( 'known', 'noclasses' )
1398                         );
1399                 } else {
1400                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1401                 }
1402                 // automatically append redirect=no to each link, since most of them are redirect pages themselves
1403                 foreach( $target as $rt ) {
1404                         if( $forceKnown ) {
1405                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1406                                         . $sk->link(
1407                                                 $rt,
1408                                                 htmlspecialchars( $rt->getFullText() ),
1409                                                 array(),
1410                                                 array(),
1411                                                 array( 'known', 'noclasses' )
1412                                         );
1413                         } else {
1414                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1415                                         . $sk->link( $rt, htmlspecialchars( $rt->getFullText() ) );
1416                         }
1417                 }
1418                 return '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
1419                         '<span class="redirectText">'.$link.'</span>';
1420
1421         }
1422
1423         public function addTrackbacks() {
1424                 global $wgOut, $wgUser;
1425                 $dbr = wfGetDB( DB_SLAVE );
1426                 $tbs = $dbr->select( 'trackbacks',
1427                         array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
1428                         array('tb_page' => $this->getID() )
1429                 );
1430                 if( !$dbr->numRows($tbs) ) return;
1431
1432                 $tbtext = "";
1433                 while( $o = $dbr->fetchObject($tbs) ) {
1434                         $rmvtxt = "";
1435                         if( $wgUser->isAllowed( 'trackback' ) ) {
1436                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid=" .
1437                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1438                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1439                         }
1440                         $tbtext .= "\n";
1441                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
1442                                         $o->tb_title,
1443                                         $o->tb_url,
1444                                         $o->tb_ex,
1445                                         $o->tb_name,
1446                                         $rmvtxt);
1447                 }
1448                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>$1</div>\n", array( 'trackbackbox', $tbtext ) );
1449                 $this->mTitle->invalidateCache();
1450         }
1451
1452         public function deletetrackback() {
1453                 global $wgUser, $wgRequest, $wgOut;
1454                 if( !$wgUser->matchEditToken($wgRequest->getVal('token')) ) {
1455                         $wgOut->addWikiMsg( 'sessionfailure' );
1456                         return;
1457                 }
1458
1459                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1460                 if( count($permission_errors) ) {
1461                         $wgOut->showPermissionsErrorPage( $permission_errors );
1462                         return;
1463                 }
1464
1465                 $db = wfGetDB( DB_MASTER );
1466                 $db->delete( 'trackbacks', array('tb_id' => $wgRequest->getInt('tbid')) );
1467
1468                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1469                 $this->mTitle->invalidateCache();
1470         }
1471
1472         public function render() {
1473                 global $wgOut;
1474                 $wgOut->setArticleBodyOnly(true);
1475                 $this->view();
1476         }
1477
1478         /**
1479          * Handle action=purge
1480          */
1481         public function purge() {
1482                 global $wgUser, $wgRequest, $wgOut;
1483                 if( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1484                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1485                                 $this->doPurge();
1486                                 $this->view();
1487                         }
1488                 } else {
1489                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1490                         $button = wfMsgExt( 'confirm_purge_button', array('escapenoentities') );
1491                         $form = "<form method=\"post\" action=\"$action\">\n" .
1492                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1493                                         "</form>\n";
1494                         $top = wfMsgExt( 'confirm-purge-top', array('parse') );
1495                         $bottom = wfMsgExt( 'confirm-purge-bottom', array('parse') );
1496                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1497                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1498                         $wgOut->addHTML( $top . $form . $bottom );
1499                 }
1500         }
1501
1502         /**
1503          * Perform the actions of a page purging
1504          */
1505         public function doPurge() {
1506                 global $wgUseSquid;
1507                 // Invalidate the cache
1508                 $this->mTitle->invalidateCache();
1509
1510                 if( $wgUseSquid ) {
1511                         // Commit the transaction before the purge is sent
1512                         $dbw = wfGetDB( DB_MASTER );
1513                         $dbw->immediateCommit();
1514
1515                         // Send purge
1516                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1517                         $update->doUpdate();
1518                 }
1519                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1520                         global $wgMessageCache;
1521                         if( $this->getID() == 0 ) {
1522                                 $text = false;
1523                         } else {
1524                                 $text = $this->getRawText();
1525                         }
1526                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1527                 }
1528         }
1529
1530         /**
1531          * Insert a new empty page record for this article.
1532          * This *must* be followed up by creating a revision
1533          * and running $this->updateToLatest( $rev_id );
1534          * or else the record will be left in a funky state.
1535          * Best if all done inside a transaction.
1536          *
1537          * @param $dbw Database
1538          * @return int The newly created page_id key, or false if the title already existed
1539          * @private
1540          */
1541         public function insertOn( $dbw ) {
1542                 wfProfileIn( __METHOD__ );
1543
1544                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1545                 $dbw->insert( 'page', array(
1546                         'page_id'           => $page_id,
1547                         'page_namespace'    => $this->mTitle->getNamespace(),
1548                         'page_title'        => $this->mTitle->getDBkey(),
1549                         'page_counter'      => 0,
1550                         'page_restrictions' => '',
1551                         'page_is_redirect'  => 0, # Will set this shortly...
1552                         'page_is_new'       => 1,
1553                         'page_random'       => wfRandom(),
1554                         'page_touched'      => $dbw->timestamp(),
1555                         'page_latest'       => 0, # Fill this in shortly...
1556                         'page_len'          => 0, # Fill this in shortly...
1557                 ), __METHOD__, 'IGNORE' );
1558
1559                 $affected = $dbw->affectedRows();
1560                 if( $affected ) {
1561                         $newid = $dbw->insertId();
1562                         $this->mTitle->resetArticleId( $newid );
1563                 }
1564                 wfProfileOut( __METHOD__ );
1565                 return $affected ? $newid : false;
1566         }
1567
1568         /**
1569          * Update the page record to point to a newly saved revision.
1570          *
1571          * @param $dbw Database object
1572          * @param $revision Revision: For ID number, and text used to set
1573                             length and redirect status fields
1574          * @param $lastRevision Integer: if given, will not overwrite the page field
1575          *                      when different from the currently set value.
1576          *                      Giving 0 indicates the new page flag should be set
1577          *                      on.
1578          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1579          *                                                       removing rows in redirect table.
1580          * @return bool true on success, false on failure
1581          * @private
1582          */
1583         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1584                 wfProfileIn( __METHOD__ );
1585
1586                 $text = $revision->getText();
1587                 $rt = Title::newFromRedirect( $text );
1588
1589                 $conditions = array( 'page_id' => $this->getId() );
1590                 if( !is_null( $lastRevision ) ) {
1591                         # An extra check against threads stepping on each other
1592                         $conditions['page_latest'] = $lastRevision;
1593                 }
1594
1595                 $dbw->update( 'page',
1596                         array( /* SET */
1597                                 'page_latest'      => $revision->getId(),
1598                                 'page_touched'     => $dbw->timestamp(),
1599                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1600                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1601                                 'page_len'         => strlen( $text ),
1602                         ),
1603                         $conditions,
1604                         __METHOD__ );
1605
1606                 $result = $dbw->affectedRows() != 0;
1607                 if( $result ) {
1608                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1609                 }
1610
1611                 wfProfileOut( __METHOD__ );
1612                 return $result;
1613         }
1614
1615         /**
1616          * Add row to the redirect table if this is a redirect, remove otherwise.
1617          *
1618          * @param $dbw Database
1619          * @param $redirectTitle a title object pointing to the redirect target,
1620          *                                               or NULL if this is not a redirect
1621          * @param $lastRevIsRedirect If given, will optimize adding and
1622          *                                                       removing rows in redirect table.
1623          * @return bool true on success, false on failure
1624          * @private
1625          */
1626         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1627                 // Always update redirects (target link might have changed)
1628                 // Update/Insert if we don't know if the last revision was a redirect or not
1629                 // Delete if changing from redirect to non-redirect
1630                 $isRedirect = !is_null($redirectTitle);
1631                 if($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1632                         wfProfileIn( __METHOD__ );
1633                         if( $isRedirect ) {
1634                                 // This title is a redirect, Add/Update row in the redirect table
1635                                 $set = array( /* SET */
1636                                         'rd_namespace' => $redirectTitle->getNamespace(),
1637                                         'rd_title'     => $redirectTitle->getDBkey(),
1638                                         'rd_from'      => $this->getId(),
1639                                 );
1640                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1641                         } else {
1642                                 // This is not a redirect, remove row from redirect table
1643                                 $where = array( 'rd_from' => $this->getId() );
1644                                 $dbw->delete( 'redirect', $where, __METHOD__);
1645                         }
1646                         if( $this->getTitle()->getNamespace() == NS_FILE ) {
1647                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1648                         }
1649                         wfProfileOut( __METHOD__ );
1650                         return ( $dbw->affectedRows() != 0 );
1651                 }
1652                 return true;
1653         }
1654
1655         /**
1656          * If the given revision is newer than the currently set page_latest,
1657          * update the page record. Otherwise, do nothing.
1658          *
1659          * @param $dbw Database object
1660          * @param $revision Revision object
1661          */
1662         public function updateIfNewerOn( &$dbw, $revision ) {
1663                 wfProfileIn( __METHOD__ );
1664                 $row = $dbw->selectRow(
1665                         array( 'revision', 'page' ),
1666                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1667                         array(
1668                                 'page_id' => $this->getId(),
1669                                 'page_latest=rev_id' ),
1670                         __METHOD__ );
1671                 if( $row ) {
1672                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1673                                 wfProfileOut( __METHOD__ );
1674                                 return false;
1675                         }
1676                         $prev = $row->rev_id;
1677                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1678                 } else {
1679                         # No or missing previous revision; mark the page as new
1680                         $prev = 0;
1681                         $lastRevIsRedirect = null;
1682                 }
1683                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1684                 wfProfileOut( __METHOD__ );
1685                 return $ret;
1686         }
1687
1688         /**
1689          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1690          * @return string Complete article text, or null if error
1691          */
1692         public function replaceSection( $section, $text, $summary = '', $edittime = NULL ) {
1693                 wfProfileIn( __METHOD__ );
1694                 if( strval( $section ) == '' ) {
1695                         // Whole-page edit; let the whole text through
1696                 } else {
1697                         if( is_null($edittime) ) {
1698                                 $rev = Revision::newFromTitle( $this->mTitle );
1699                         } else {
1700                                 $dbw = wfGetDB( DB_MASTER );
1701                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1702                         }
1703                         if( !$rev ) {
1704                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1705                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1706                                 return null;
1707                         }
1708                         $oldtext = $rev->getText();
1709
1710                         if( $section == 'new' ) {
1711                                 # Inserting a new section
1712                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1713                                 $text = strlen( trim( $oldtext ) ) > 0
1714                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1715                                                 : "{$subject}{$text}";
1716                         } else {
1717                                 # Replacing an existing section; roll out the big guns
1718                                 global $wgParser;
1719                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1720                         }
1721                 }
1722                 wfProfileOut( __METHOD__ );
1723                 return $text;
1724         }
1725
1726         /**
1727          * This function is not deprecated until somebody fixes the core not to use
1728          * it. Nevertheless, use Article::doEdit() instead.
1729          */
1730         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1731                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1732                         ( $isminor ? EDIT_MINOR : 0 ) |
1733                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1734                         ( $bot ? EDIT_FORCE_BOT : 0 );
1735
1736                 # If this is a comment, add the summary as headline
1737                 if( $comment && $summary != "" ) {
1738                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1739                 }
1740
1741                 $this->doEdit( $text, $summary, $flags );
1742
1743                 $dbw = wfGetDB( DB_MASTER );
1744                 if($watchthis) {
1745                         if(!$this->mTitle->userIsWatching()) {
1746                                 $dbw->begin();
1747                                 $this->doWatch();
1748                                 $dbw->commit();
1749                         }
1750                 } else {
1751                         if( $this->mTitle->userIsWatching() ) {
1752                                 $dbw->begin();
1753                                 $this->doUnwatch();
1754                                 $dbw->commit();
1755                         }
1756                 }
1757                 $this->doRedirect( $this->isRedirect( $text ) );
1758         }
1759
1760         /**
1761          * @deprecated use Article::doEdit()
1762          */
1763         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1764                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1765                         ( $minor ? EDIT_MINOR : 0 ) |
1766                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1767
1768                 $status = $this->doEdit( $text, $summary, $flags );
1769                 if( !$status->isOK() ) {
1770                         return false;
1771                 }
1772
1773                 $dbw = wfGetDB( DB_MASTER );
1774                 if( $watchthis ) {
1775                         if(!$this->mTitle->userIsWatching()) {
1776                                 $dbw->begin();
1777                                 $this->doWatch();
1778                                 $dbw->commit();
1779                         }
1780                 } else {
1781                         if( $this->mTitle->userIsWatching() ) {
1782                                 $dbw->begin();
1783                                 $this->doUnwatch();
1784                                 $dbw->commit();
1785                         }
1786                 }
1787
1788                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1789                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1790
1791                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1792                 return true;
1793         }
1794
1795         /**
1796          * Article::doEdit()
1797          *
1798          * Change an existing article or create a new article. Updates RC and all necessary caches,
1799          * optionally via the deferred update array.
1800          *
1801          * $wgUser must be set before calling this function.
1802          *
1803          * @param $text String: new text
1804          * @param $summary String: edit summary
1805          * @param $flags Integer bitfield:
1806          *      EDIT_NEW
1807          *          Article is known or assumed to be non-existent, create a new one
1808          *      EDIT_UPDATE
1809          *          Article is known or assumed to be pre-existing, update it
1810          *      EDIT_MINOR
1811          *          Mark this edit minor, if the user is allowed to do so
1812          *      EDIT_SUPPRESS_RC
1813          *          Do not log the change in recentchanges
1814          *      EDIT_FORCE_BOT
1815          *          Mark the edit a "bot" edit regardless of user rights
1816          *      EDIT_DEFER_UPDATES
1817          *          Defer some of the updates until the end of index.php
1818          *      EDIT_AUTOSUMMARY
1819          *          Fill in blank summaries with generated text where possible
1820          *
1821          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1822          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1823          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1824          * edit-already-exists error will be returned. These two conditions are also possible with
1825          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1826          *
1827          * @param $baseRevId the revision ID this edit was based off, if any
1828          * @param $user Optional user object, $wgUser will be used if not passed
1829          *
1830          * @return Status object. Possible errors:
1831          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1832          *     edit-gone-missing:       In update mode, but the article didn't exist
1833          *     edit-conflict:           In update mode, the article changed unexpectedly
1834          *     edit-no-change:          Warning that the text was the same as before
1835          *     edit-already-exists:     In creation mode, but the article already exists
1836          *
1837          *  Extensions may define additional errors.
1838          *
1839          *  $return->value will contain an associative array with members as follows:
1840          *     new:                     Boolean indicating if the function attempted to create a new article
1841          *     revision:                The revision object for the inserted revision, or null
1842          *
1843          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1844          */
1845         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1846                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1847
1848                 # Low-level sanity check
1849                 if( $this->mTitle->getText() == '' ) {
1850                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1851                 }
1852
1853                 wfProfileIn( __METHOD__ );
1854
1855                 $user = is_null($user) ? $wgUser : $user;
1856                 $status = Status::newGood( array() );
1857
1858                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1859                 $this->loadPageData();
1860
1861                 if( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1862                         $aid = $this->mTitle->getArticleID();
1863                         if( $aid ) {
1864                                 $flags |= EDIT_UPDATE;
1865                         } else {
1866                                 $flags |= EDIT_NEW;
1867                         }
1868                 }
1869
1870                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1871                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1872                 {
1873                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1874                         wfProfileOut( __METHOD__ );
1875                         if( $status->isOK() ) {
1876                                 $status->fatal( 'edit-hook-aborted');
1877                         }
1878                         return $status;
1879                 }
1880
1881                 # Silently ignore EDIT_MINOR if not allowed
1882                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed('minoredit');
1883                 $bot = $flags & EDIT_FORCE_BOT;
1884
1885                 $oldtext = $this->getRawText(); // current revision
1886                 $oldsize = strlen( $oldtext );
1887
1888                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1889                 if( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1890                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1891                 }
1892
1893                 $editInfo = $this->prepareTextForEdit( $text );
1894                 $text = $editInfo->pst;
1895                 $newsize = strlen( $text );
1896
1897                 $dbw = wfGetDB( DB_MASTER );
1898                 $now = wfTimestampNow();
1899
1900                 if( $flags & EDIT_UPDATE ) {
1901                         # Update article, but only if changed.
1902                         $status->value['new'] = false;
1903                         # Make sure the revision is either completely inserted or not inserted at all
1904                         if( !$wgDBtransactions ) {
1905                                 $userAbort = ignore_user_abort( true );
1906                         }
1907
1908                         $revisionId = 0;
1909
1910                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1911
1912                         if( $changed ) {
1913                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1914                                   - (int)$this->isCountable( $oldtext );
1915                                 $this->mTotalAdjustment = 0;
1916
1917                                 if( !$this->mLatest ) {
1918                                         # Article gone missing
1919                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1920                                         $status->fatal( 'edit-gone-missing' );
1921                                         wfProfileOut( __METHOD__ );
1922                                         return $status;
1923                                 }
1924
1925                                 $revision = new Revision( array(
1926                                         'page'       => $this->getId(),
1927                                         'comment'    => $summary,
1928                                         'minor_edit' => $isminor,
1929                                         'text'       => $text,
1930                                         'parent_id'  => $this->mLatest,
1931                                         'user'       => $user->getId(),
1932                                         'user_text'  => $user->getName(),
1933                                         ) );
1934
1935                                 $dbw->begin();
1936                                 $revisionId = $revision->insertOn( $dbw );
1937
1938                                 # Update page
1939                                 #
1940                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1941                                 # during the course of this function. This makes sure that EditPage can detect
1942                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1943                                 # before this function is called. A previous function used a separate query, this
1944                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1945                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1946
1947                                 if( !$ok ) {
1948                                         /* Belated edit conflict! Run away!! */
1949                                         $status->fatal( 'edit-conflict' );
1950                                         # Delete the invalid revision if the DB is not transactional
1951                                         if( !$wgDBtransactions ) {
1952                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1953                                         }
1954                                         $revisionId = 0;
1955                                         $dbw->rollback();
1956                                 } else {
1957                                         global $wgUseRCPatrol;
1958                                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, $baseRevId, $user) );
1959                                         # Update recentchanges
1960                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1961                                                 # Mark as patrolled if the user can do so
1962                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan('autopatrol');
1963                                                 # Add RC row to the DB
1964                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1965                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1966                                                         $revisionId, $patrolled
1967                                                 );
1968                                                 # Log auto-patrolled edits
1969                                                 if( $patrolled ) {
1970                                                         PatrolLog::record( $rc, true );
1971                                                 }
1972                                         }
1973                                         $user->incEditCount();
1974                                         $dbw->commit();
1975                                 }
1976                         } else {
1977                                 $status->warning( 'edit-no-change' );
1978                                 $revision = null;
1979                                 // Keep the same revision ID, but do some updates on it
1980                                 $revisionId = $this->getRevIdFetched();
1981                                 // Update page_touched, this is usually implicit in the page update
1982                                 // Other cache updates are done in onArticleEdit()
1983                                 $this->mTitle->invalidateCache();
1984                         }
1985
1986                         if( !$wgDBtransactions ) {
1987                                 ignore_user_abort( $userAbort );
1988                         }
1989                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1990                         if( !$status->isOK() ) {
1991                                 wfProfileOut( __METHOD__ );
1992                                 return $status;
1993                         }
1994
1995                         # Invalidate cache of this article and all pages using this article
1996                         # as a template. Partly deferred.
1997                         Article::onArticleEdit( $this->mTitle );
1998                         # Update links tables, site stats, etc.
1999                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
2000                 } else {
2001                         # Create new article
2002                         $status->value['new'] = true;
2003
2004                         # Set statistics members
2005                         # We work out if it's countable after PST to avoid counter drift
2006                         # when articles are created with {{subst:}}
2007                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2008                         $this->mTotalAdjustment = 1;
2009
2010                         $dbw->begin();
2011
2012                         # Add the page record; stake our claim on this title!
2013                         # This will return false if the article already exists
2014                         $newid = $this->insertOn( $dbw );
2015
2016                         if( $newid === false ) {
2017                                 $dbw->rollback();
2018                                 $status->fatal( 'edit-already-exists' );
2019                                 wfProfileOut( __METHOD__ );
2020                                 return $status;
2021                         }
2022
2023                         # Save the revision text...
2024                         $revision = new Revision( array(
2025                                 'page'       => $newid,
2026                                 'comment'    => $summary,
2027                                 'minor_edit' => $isminor,
2028                                 'text'       => $text,
2029                                 'user'       => $user->getId(),
2030                                 'user_text'  => $user->getName(),
2031                                 ) );
2032                         $revisionId = $revision->insertOn( $dbw );
2033
2034                         $this->mTitle->resetArticleID( $newid );
2035
2036                         # Update the page record with revision data
2037                         $this->updateRevisionOn( $dbw, $revision, 0 );
2038
2039                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $user) );
2040                         # Update recentchanges
2041                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
2042                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2043                                 # Mark as patrolled if the user can do so
2044                                 $patrolled = ($wgUseRCPatrol || $wgUseNPPatrol) && $this->mTitle->userCan('autopatrol');
2045                                 # Add RC row to the DB
2046                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2047                                         '', strlen($text), $revisionId, $patrolled );
2048                                 # Log auto-patrolled edits
2049                                 if( $patrolled ) {
2050                                         PatrolLog::record( $rc, true );
2051                                 }
2052                         }
2053                         $user->incEditCount();
2054                         $dbw->commit();
2055
2056                         # Update links, etc.
2057                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
2058
2059                         # Clear caches
2060                         Article::onArticleCreate( $this->mTitle );
2061
2062                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2063                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
2064                 }
2065
2066                 # Do updates right now unless deferral was requested
2067                 if( !( $flags & EDIT_DEFER_UPDATES ) ) {
2068                         wfDoUpdates();
2069                 }
2070
2071                 // Return the new revision (or null) to the caller
2072                 $status->value['revision'] = $revision;
2073
2074                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2075                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
2076
2077                 wfProfileOut( __METHOD__ );
2078                 return $status;
2079         }
2080
2081         /**
2082          * @deprecated wrapper for doRedirect
2083          */
2084         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
2085                 wfDeprecated( __METHOD__ );
2086                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
2087         }
2088
2089         /**
2090          * Output a redirect back to the article.
2091          * This is typically used after an edit.
2092          *
2093          * @param $noRedir Boolean: add redirect=no
2094          * @param $sectionAnchor String: section to redirect to, including "#"
2095          * @param $extraQuery String: extra query params
2096          */
2097         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2098                 global $wgOut;
2099                 if( $noRedir ) {
2100                         $query = 'redirect=no';
2101                         if( $extraQuery )
2102                                 $query .= "&$query";
2103                 } else {
2104                         $query = $extraQuery;
2105                 }
2106                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2107         }
2108
2109         /**
2110          * Mark this particular edit/page as patrolled
2111          */
2112         public function markpatrolled() {
2113                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
2114                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2115
2116                 # If we haven't been given an rc_id value, we can't do anything
2117                 $rcid = (int) $wgRequest->getVal('rcid');
2118                 $rc = RecentChange::newFromId($rcid);
2119                 if( is_null($rc) ) {
2120                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2121                         return;
2122                 }
2123
2124                 #It would be nice to see where the user had actually come from, but for now just guess
2125                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2126                 $return = SpecialPage::getTitleFor( $returnto );
2127
2128                 $dbw = wfGetDB( DB_MASTER );
2129                 $errors = $rc->doMarkPatrolled();
2130
2131                 if( in_array(array('rcpatroldisabled'), $errors) ) {
2132                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2133                         return;
2134                 }
2135
2136                 if( in_array(array('hookaborted'), $errors) ) {
2137                         // The hook itself has handled any output
2138                         return;
2139                 }
2140
2141                 if( in_array(array('markedaspatrollederror-noautopatrol'), $errors) ) {
2142                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2143                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2144                         $wgOut->returnToMain( false, $return );
2145                         return;
2146                 }
2147
2148                 if( !empty($errors) ) {
2149                         $wgOut->showPermissionsErrorPage( $errors );
2150                         return;
2151                 }
2152
2153                 # Inform the user
2154                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2155                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
2156                 $wgOut->returnToMain( false, $return );
2157         }
2158
2159         /**
2160          * User-interface handler for the "watch" action
2161          */
2162
2163         public function watch() {
2164                 global $wgUser, $wgOut;
2165                 if( $wgUser->isAnon() ) {
2166                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2167                         return;
2168                 }
2169                 if( wfReadOnly() ) {
2170                         $wgOut->readOnlyPage();
2171                         return;
2172                 }
2173                 if( $this->doWatch() ) {
2174                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
2175                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2176                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
2177                 }
2178                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2179         }
2180
2181         /**
2182          * Add this page to $wgUser's watchlist
2183          * @return bool true on successful watch operation
2184          */
2185         public function doWatch() {
2186                 global $wgUser;
2187                 if( $wgUser->isAnon() ) {
2188                         return false;
2189                 }
2190                 if( wfRunHooks('WatchArticle', array(&$wgUser, &$this)) ) {
2191                         $wgUser->addWatch( $this->mTitle );
2192                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
2193                 }
2194                 return false;
2195         }
2196
2197         /**
2198          * User interface handler for the "unwatch" action.
2199          */
2200         public function unwatch() {
2201                 global $wgUser, $wgOut;
2202                 if( $wgUser->isAnon() ) {
2203                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2204                         return;
2205                 }
2206                 if( wfReadOnly() ) {
2207                         $wgOut->readOnlyPage();
2208                         return;
2209                 }
2210                 if( $this->doUnwatch() ) {
2211                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
2212                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2213                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
2214                 }
2215                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2216         }
2217
2218         /**
2219          * Stop watching a page
2220          * @return bool true on successful unwatch
2221          */
2222         public function doUnwatch() {
2223                 global $wgUser;
2224                 if( $wgUser->isAnon() ) {
2225                         return false;
2226                 }
2227                 if( wfRunHooks('UnwatchArticle', array(&$wgUser, &$this)) ) {
2228                         $wgUser->removeWatch( $this->mTitle );
2229                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
2230                 }
2231                 return false;
2232         }
2233
2234         /**
2235          * action=protect handler
2236          */
2237         public function protect() {
2238                 $form = new ProtectionForm( $this );
2239                 $form->execute();
2240         }
2241
2242         /**
2243          * action=unprotect handler (alias)
2244          */
2245         public function unprotect() {
2246                 $this->protect();
2247         }
2248
2249         /**
2250          * Update the article's restriction field, and leave a log entry.
2251          *
2252          * @param $limit Array: set of restriction keys
2253          * @param $reason String
2254          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2255          * @param $expiry Array: per restriction type expiration
2256          * @return bool true on success
2257          */
2258         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2259                 global $wgUser, $wgRestrictionTypes, $wgContLang;
2260
2261                 $id = $this->mTitle->getArticleID();
2262                 if ( $id <= 0 ) {
2263                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
2264                         return false;
2265                 }
2266
2267                 if ( wfReadOnly() ) {
2268                         wfDebug( "updateRestrictions failed: read-only\n" );
2269                         return false;
2270                 }
2271
2272                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2273                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2274                         return false;
2275                 }
2276
2277                 if( !$cascade ) {
2278                         $cascade = false;
2279                 }
2280
2281                 // Take this opportunity to purge out expired restrictions
2282                 Title::purgeExpiredRestrictions();
2283
2284                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2285                 # we expect a single selection, but the schema allows otherwise.
2286                 $current = array();
2287                 $updated = Article::flattenRestrictions( $limit );
2288                 $changed = false;
2289                 foreach( $wgRestrictionTypes as $action ) {
2290                         if( isset( $expiry[$action] ) ) {
2291                                 # Get current restrictions on $action
2292                                 $aLimits = $this->mTitle->getRestrictions( $action );
2293                                 $current[$action] = implode( '', $aLimits );
2294                                 # Are any actual restrictions being dealt with here?
2295                                 $aRChanged = count($aLimits) || !empty($limit[$action]);
2296                                 # If something changed, we need to log it. Checking $aRChanged
2297                                 # assures that "unprotecting" a page that is not protected does
2298                                 # not log just because the expiry was "changed".
2299                                 if( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2300                                         $changed = true;
2301                                 }
2302                         }
2303                 }
2304
2305                 $current = Article::flattenRestrictions( $current );
2306
2307                 $changed = ($changed || $current != $updated );
2308                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
2309                 $protect = ( $updated != '' );
2310
2311                 # If nothing's changed, do nothing
2312                 if( $changed ) {
2313                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2314
2315                                 $dbw = wfGetDB( DB_MASTER );
2316
2317                                 # Prepare a null revision to be added to the history
2318                                 $modified = $current != '' && $protect;
2319                                 if( $protect ) {
2320                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2321                                 } else {
2322                                         $comment_type = 'unprotectedarticle';
2323                                 }
2324                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2325
2326                                 # Only restrictions with the 'protect' right can cascade...
2327                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2328                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2329                                 # The schema allows multiple restrictions
2330                                 if(!in_array('protect', $editrestriction) && !in_array('sysop', $editrestriction))
2331                                         $cascade = false;
2332                                 $cascade_description = '';
2333                                 if( $cascade ) {
2334                                         $cascade_description = ' ['.wfMsgForContent('protect-summary-cascade').']';
2335                                 }
2336
2337                                 if( $reason )
2338                                         $comment .= ": $reason";
2339
2340                                 $editComment = $comment;
2341                                 $encodedExpiry = array();
2342                                 $protect_description = '';
2343                                 foreach( $limit as $action => $restrictions  ) {
2344                                         if ( !isset($expiry[$action]) )
2345                                                 $expiry[$action] = 'infinite';
2346
2347                                         $encodedExpiry[$action] = Block::encodeExpiry($expiry[$action], $dbw );
2348                                         if( $restrictions != '' ) {
2349                                                 $protect_description .= "[$action=$restrictions] (";
2350                                                 if( $encodedExpiry[$action] != 'infinity' ) {
2351                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2352                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2353                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2354                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2355                                                 } else {
2356                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2357                                                 }
2358                                                 $protect_description .= ') ';
2359                                         }
2360                                 }
2361                                 $protect_description = trim($protect_description);
2362
2363                                 if( $protect_description && $protect )
2364                                         $editComment .= " ($protect_description)";
2365                                 if( $cascade )
2366                                         $editComment .= "$cascade_description";
2367                                 # Update restrictions table
2368                                 foreach( $limit as $action => $restrictions ) {
2369                                         if($restrictions != '' ) {
2370                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
2371                                                         array( 'pr_page' => $id,
2372                                                                 'pr_type' => $action,
2373                                                                 'pr_level' => $restrictions,
2374                                                                 'pr_cascade' => ($cascade && $action == 'edit') ? 1 : 0,
2375                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
2376                                         } else {
2377                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2378                                                         'pr_type' => $action ), __METHOD__ );
2379                                         }
2380                                 }
2381
2382                                 # Insert a null revision
2383                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2384                                 $nullRevId = $nullRevision->insertOn( $dbw );
2385
2386                                 $latest = $this->getLatest();
2387                                 # Update page record
2388                                 $dbw->update( 'page',
2389                                         array( /* SET */
2390                                                 'page_touched' => $dbw->timestamp(),
2391                                                 'page_restrictions' => '',
2392                                                 'page_latest' => $nullRevId
2393                                         ), array( /* WHERE */
2394                                                 'page_id' => $id
2395                                         ), 'Article::protect'
2396                                 );
2397
2398                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $nullRevision, $latest, $wgUser) );
2399                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2400
2401                                 # Update the protection log
2402                                 $log = new LogPage( 'protect' );
2403                                 if( $protect ) {
2404                                         $params = array($protect_description,$cascade ? 'cascade' : '');
2405                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason), $params );
2406                                 } else {
2407                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2408                                 }
2409
2410                         } # End hook
2411                 } # End "changed" check
2412
2413                 return true;
2414         }
2415
2416         /**
2417          * Take an array of page restrictions and flatten it to a string
2418          * suitable for insertion into the page_restrictions field.
2419          * @param $limit Array
2420          * @return String
2421          */
2422         protected static function flattenRestrictions( $limit ) {
2423                 if( !is_array( $limit ) ) {
2424                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2425                 }
2426                 $bits = array();
2427                 ksort( $limit );
2428                 foreach( $limit as $action => $restrictions ) {
2429                         if( $restrictions != '' ) {
2430                                 $bits[] = "$action=$restrictions";
2431                         }
2432                 }
2433                 return implode( ':', $bits );
2434         }
2435
2436         /**
2437          * Auto-generates a deletion reason
2438          * @param &$hasHistory Boolean: whether the page has a history
2439          */
2440         public function generateReason( &$hasHistory ) {
2441                 global $wgContLang;
2442                 $dbw = wfGetDB( DB_MASTER );
2443                 // Get the last revision
2444                 $rev = Revision::newFromTitle( $this->mTitle );
2445                 if( is_null( $rev ) )
2446                         return false;
2447
2448                 // Get the article's contents
2449                 $contents = $rev->getText();
2450                 $blank = false;
2451                 // If the page is blank, use the text from the previous revision,
2452                 // which can only be blank if there's a move/import/protect dummy revision involved
2453                 if( $contents == '' ) {
2454                         $prev = $rev->getPrevious();
2455                         if( $prev )     {
2456                                 $contents = $prev->getText();
2457                                 $blank = true;
2458                         }
2459                 }
2460
2461                 // Find out if there was only one contributor
2462                 // Only scan the last 20 revisions
2463                 $res = $dbw->select( 'revision', 'rev_user_text',
2464                         array( 'rev_page' => $this->getID(), $dbw->bitAnd('rev_deleted', Revision::DELETED_USER) . ' = 0' ),
2465                         __METHOD__,
2466                         array( 'LIMIT' => 20 )
2467                 );
2468                 if( $res === false )
2469                         // This page has no revisions, which is very weird
2470                         return false;
2471
2472                 $hasHistory = ( $res->numRows() > 1 );
2473                 $row = $dbw->fetchObject( $res );
2474                 $onlyAuthor = $row->rev_user_text;
2475                 // Try to find a second contributor
2476                 foreach( $res as $row ) {
2477                         if( $row->rev_user_text != $onlyAuthor ) {
2478                                 $onlyAuthor = false;
2479                                 break;
2480                         }
2481                 }
2482                 $dbw->freeResult( $res );
2483
2484                 // Generate the summary with a '$1' placeholder
2485                 if( $blank ) {
2486                         // The current revision is blank and the one before is also
2487                         // blank. It's just not our lucky day
2488                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2489                 } else {
2490                         if( $onlyAuthor )
2491                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2492                         else
2493                                 $reason = wfMsgForContent( 'excontent', '$1' );
2494                 }
2495
2496                 if( $reason == '-' ) {
2497                         // Allow these UI messages to be blanked out cleanly
2498                         return '';
2499                 }
2500
2501                 // Replace newlines with spaces to prevent uglyness
2502                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2503                 // Calculate the maximum amount of chars to get
2504                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2505                 $maxLength = 255 - (strlen( $reason ) - 2) - 3;
2506                 $contents = $wgContLang->truncate( $contents, $maxLength );
2507                 // Remove possible unfinished links
2508                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2509                 // Now replace the '$1' placeholder
2510                 $reason = str_replace( '$1', $contents, $reason );
2511                 return $reason;
2512         }
2513
2514
2515         /*
2516          * UI entry point for page deletion
2517          */
2518         public function delete() {
2519                 global $wgUser, $wgOut, $wgRequest;
2520
2521                 $confirm = $wgRequest->wasPosted() &&
2522                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2523
2524                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2525                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2526
2527                 $reason = $this->DeleteReasonList;
2528
2529                 if( $reason != 'other' && $this->DeleteReason != '' ) {
2530                         // Entry from drop down menu + additional comment
2531                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2532                 } elseif( $reason == 'other' ) {
2533                         $reason = $this->DeleteReason;
2534                 }
2535                 # Flag to hide all contents of the archived revisions
2536                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2537
2538                 # This code desperately needs to be totally rewritten
2539
2540                 # Read-only check...
2541                 if( wfReadOnly() ) {
2542                         $wgOut->readOnlyPage();
2543                         return;
2544                 }
2545
2546                 # Check permissions
2547                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2548
2549                 if( count( $permission_errors ) > 0 ) {
2550                         $wgOut->showPermissionsErrorPage( $permission_errors );
2551                         return;
2552                 }
2553
2554                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2555
2556                 # Better double-check that it hasn't been deleted yet!
2557                 $dbw = wfGetDB( DB_MASTER );
2558                 $conds = $this->mTitle->pageCond();
2559                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2560                 if( $latest === false ) {
2561                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2562                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2563                         LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2564                         return;
2565                 }
2566
2567                 # Hack for big sites
2568                 $bigHistory = $this->isBigDeletion();
2569                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2570                         global $wgLang, $wgDeleteRevisionsLimit;
2571                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2572                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2573                         return;
2574                 }
2575
2576                 if( $confirm ) {
2577                         $this->doDelete( $reason, $suppress );
2578                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2579                                 $this->doWatch();
2580                         } elseif( $this->mTitle->userIsWatching() ) {
2581                                 $this->doUnwatch();
2582                         }
2583                         return;
2584                 }
2585
2586                 // Generate deletion reason
2587                 $hasHistory = false;
2588                 if( !$reason ) $reason = $this->generateReason($hasHistory);
2589
2590                 // If the page has a history, insert a warning
2591                 if( $hasHistory && !$confirm ) {
2592                         $skin = $wgUser->getSkin();
2593                         $wgOut->addHTML( '<strong>' . wfMsgExt( 'historywarning', array( 'parseinline' ) ) . ' ' . $skin->historyLink() . '</strong>' );
2594                         if( $bigHistory ) {
2595                                 global $wgLang, $wgDeleteRevisionsLimit;
2596                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2597                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2598                         }
2599                 }
2600
2601                 return $this->confirmDelete( $reason );
2602         }
2603
2604         /**
2605          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2606          */
2607         public function isBigDeletion() {
2608                 global $wgDeleteRevisionsLimit;
2609                 if( $wgDeleteRevisionsLimit ) {
2610                         $revCount = $this->estimateRevisionCount();
2611                         return $revCount > $wgDeleteRevisionsLimit;
2612                 }
2613                 return false;
2614         }
2615
2616         /**
2617          * @return int approximate revision count
2618          */
2619         public function estimateRevisionCount() {
2620                 $dbr = wfGetDB( DB_SLAVE );
2621                 // For an exact count...
2622                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2623                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2624                 return $dbr->estimateRowCount( 'revision', '*',
2625                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2626         }
2627
2628         /**
2629          * Get the last N authors
2630          * @param $num Integer: number of revisions to get
2631          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2632          * @return array Array of authors, duplicates not removed
2633          */
2634         public function getLastNAuthors( $num, $revLatest = 0 ) {
2635                 wfProfileIn( __METHOD__ );
2636                 // First try the slave
2637                 // If that doesn't have the latest revision, try the master
2638                 $continue = 2;
2639                 $db = wfGetDB( DB_SLAVE );
2640                 do {
2641                         $res = $db->select( array( 'page', 'revision' ),
2642                                 array( 'rev_id', 'rev_user_text' ),
2643                                 array(
2644                                         'page_namespace' => $this->mTitle->getNamespace(),
2645                                         'page_title' => $this->mTitle->getDBkey(),
2646                                         'rev_page = page_id'
2647                                 ), __METHOD__, $this->getSelectOptions( array(
2648                                         'ORDER BY' => 'rev_timestamp DESC',
2649                                         'LIMIT' => $num
2650                                 ) )
2651                         );
2652                         if( !$res ) {
2653                                 wfProfileOut( __METHOD__ );
2654                                 return array();
2655                         }
2656                         $row = $db->fetchObject( $res );
2657                         if( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2658                                 $db = wfGetDB( DB_MASTER );
2659                                 $continue--;
2660                         } else {
2661                                 $continue = 0;
2662                         }
2663                 } while ( $continue );
2664
2665                 $authors = array( $row->rev_user_text );
2666                 while ( $row = $db->fetchObject( $res ) ) {
2667                         $authors[] = $row->rev_user_text;
2668                 }
2669                 wfProfileOut( __METHOD__ );
2670                 return $authors;
2671         }
2672
2673         /**
2674          * Output deletion confirmation dialog
2675          * @param $reason String: prefilled reason
2676          */
2677         public function confirmDelete( $reason ) {
2678                 global $wgOut, $wgUser;
2679
2680                 wfDebug( "Article::confirmDelete\n" );
2681
2682                 $deleteBackLink = $wgUser->getSkin()->link(
2683                         $this->mTitle,
2684                         null,
2685                         array(),
2686                         array(),
2687                         array( 'known', 'noclasses' )
2688                 );
2689                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
2690                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2691                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2692
2693                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
2694
2695                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
2696                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2697                                         <td></td>
2698                                         <td class='mw-input'><strong>" .
2699                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2700                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2701                                         "</strong></td>
2702                                 </tr>";
2703                 } else {
2704                         $suppress = '';
2705                 }
2706                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2707
2708                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2709                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2710                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2711                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2712                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2713                         "<tr id=\"wpDeleteReasonListRow\">
2714                                 <td class='mw-label'>" .
2715                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2716                                 "</td>
2717                                 <td class='mw-input'>" .
2718                                         Xml::listDropDown( 'wpDeleteReasonList',
2719                                                 wfMsgForContent( 'deletereason-dropdown' ),
2720                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2721                                 "</td>
2722                         </tr>
2723                         <tr id=\"wpDeleteReasonRow\">
2724                                 <td class='mw-label'>" .
2725                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2726                                 "</td>
2727                                 <td class='mw-input'>" .
2728                                 Html::input( 'wpReason', $reason, 'text', array(
2729                                         'size' => '60',
2730                                         'maxlength' => '255',
2731                                         'tabindex' => '2',
2732                                         'id' => 'wpReason',
2733                                         'autofocus'
2734                                 ) ) .
2735                                 "</td>
2736                         </tr>
2737                         <tr>
2738                                 <td></td>
2739                                 <td class='mw-input'>" .
2740                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2741                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2742                                 "</td>
2743                         </tr>
2744                         $suppress
2745                         <tr>
2746                                 <td></td>
2747                                 <td class='mw-submit'>" .
2748                                         Xml::submitButton( wfMsg( 'deletepage' ),
2749                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2750                                 "</td>
2751                         </tr>" .
2752                         Xml::closeElement( 'table' ) .
2753                         Xml::closeElement( 'fieldset' ) .
2754                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2755                         Xml::closeElement( 'form' );
2756
2757                         if( $wgUser->isAllowed( 'editinterface' ) ) {
2758                                 $skin = $wgUser->getSkin();
2759                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
2760                                 $link = $skin->link(
2761                                         $title,
2762                                         wfMsgHtml( 'delete-edit-reasonlist' ),
2763                                         array(),
2764                                         array( 'action' => 'edit' )
2765                                 );
2766                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2767                         }
2768
2769                 $wgOut->addHTML( $form );
2770                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2771                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2772         }
2773
2774         /**
2775          * Perform a deletion and output success or failure messages
2776          */
2777         public function doDelete( $reason, $suppress = false ) {
2778                 global $wgOut, $wgUser;
2779                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2780
2781                 $error = '';
2782                 if( wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason, &$error)) ) {
2783                         if( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2784                                 $deleted = $this->mTitle->getPrefixedText();
2785
2786                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2787                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2788
2789                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2790
2791                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2792                                 $wgOut->returnToMain( false );
2793                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason, $id));
2794                         }
2795                 } else {
2796                         if( $error == '' ) {
2797                                 $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2798                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2799                                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2800                         } else {
2801                                 $wgOut->showFatalError( $error );
2802                         }
2803                 }
2804         }
2805
2806         /**
2807          * Back-end article deletion
2808          * Deletes the article with database consistency, writes logs, purges caches
2809          * Returns success
2810          */
2811         public function doDeleteArticle( $reason, $suppress = false, $id = 0 ) {
2812                 global $wgUseSquid, $wgDeferredUpdateList;
2813                 global $wgUseTrackbacks;
2814
2815                 wfDebug( __METHOD__."\n" );
2816
2817                 $dbw = wfGetDB( DB_MASTER );
2818                 $ns = $this->mTitle->getNamespace();
2819                 $t = $this->mTitle->getDBkey();
2820                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2821
2822                 if( $t == '' || $id == 0 ) {
2823                         return false;
2824                 }
2825
2826                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getRawText() ), -1 );
2827                 array_push( $wgDeferredUpdateList, $u );
2828
2829                 // Bitfields to further suppress the content
2830                 if( $suppress ) {
2831                         $bitfield = 0;
2832                         // This should be 15...
2833                         $bitfield |= Revision::DELETED_TEXT;
2834                         $bitfield |= Revision::DELETED_COMMENT;
2835                         $bitfield |= Revision::DELETED_USER;
2836                         $bitfield |= Revision::DELETED_RESTRICTED;
2837                 } else {
2838                         $bitfield = 'rev_deleted';
2839                 }
2840
2841                 $dbw->begin();
2842                 // For now, shunt the revision data into the archive table.
2843                 // Text is *not* removed from the text table; bulk storage
2844                 // is left intact to avoid breaking block-compression or
2845                 // immutable storage schemes.
2846                 //
2847                 // For backwards compatibility, note that some older archive
2848                 // table entries will have ar_text and ar_flags fields still.
2849                 //
2850                 // In the future, we may keep revisions and mark them with
2851                 // the rev_deleted field, which is reserved for this purpose.
2852                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2853                         array(
2854                                 'ar_namespace'  => 'page_namespace',
2855                                 'ar_title'      => 'page_title',
2856                                 'ar_comment'    => 'rev_comment',
2857                                 'ar_user'       => 'rev_user',
2858                                 'ar_user_text'  => 'rev_user_text',
2859                                 'ar_timestamp'  => 'rev_timestamp',
2860                                 'ar_minor_edit' => 'rev_minor_edit',
2861                                 'ar_rev_id'     => 'rev_id',
2862                                 'ar_text_id'    => 'rev_text_id',
2863                                 'ar_text'       => '\'\'', // Be explicit to appease
2864                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2865                                 'ar_len'        => 'rev_len',
2866                                 'ar_page_id'    => 'page_id',
2867                                 'ar_deleted'    => $bitfield
2868                         ), array(
2869                                 'page_id' => $id,
2870                                 'page_id = rev_page'
2871                         ), __METHOD__
2872                 );
2873
2874                 # Delete restrictions for it
2875                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2876
2877                 # Now that it's safely backed up, delete it
2878                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2879                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2880                 if( !$ok ) {
2881                         $dbw->rollback();
2882                         return false;
2883                 }
2884
2885                 # Fix category table counts
2886                 $cats = array();
2887                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2888                 foreach( $res as $row ) {
2889                         $cats []= $row->cl_to;
2890                 }
2891                 $this->updateCategoryCounts( array(), $cats );
2892
2893                 # If using cascading deletes, we can skip some explicit deletes
2894                 if( !$dbw->cascadingDeletes() ) {
2895                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2896
2897                         if($wgUseTrackbacks)
2898                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2899
2900                         # Delete outgoing links
2901                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2902                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2903                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2904                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2905                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2906                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2907                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2908                 }
2909
2910                 # If using cleanup triggers, we can skip some manual deletes
2911                 if( !$dbw->cleanupTriggers() ) {
2912                         # Clean up recentchanges entries...
2913                         $dbw->delete( 'recentchanges',
2914                                 array( 'rc_type != '.RC_LOG,
2915                                         'rc_namespace' => $this->mTitle->getNamespace(),
2916                                         'rc_title' => $this->mTitle->getDBkey() ),
2917                                 __METHOD__ );
2918                         $dbw->delete( 'recentchanges',
2919                                 array( 'rc_type != '.RC_LOG, 'rc_cur_id' => $id ),
2920                                 __METHOD__ );
2921                 }
2922
2923                 # Clear caches
2924                 Article::onArticleDelete( $this->mTitle );
2925
2926                 # Clear the cached article id so the interface doesn't act like we exist
2927                 $this->mTitle->resetArticleID( 0 );
2928
2929                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2930                 $logtype = $suppress ? 'suppress' : 'delete';
2931                 $log = new LogPage( $logtype );
2932
2933                 # Make sure logging got through
2934                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2935
2936                 $dbw->commit();
2937
2938                 return true;
2939         }
2940
2941         /**
2942          * Roll back the most recent consecutive set of edits to a page
2943          * from the same user; fails if there are no eligible edits to
2944          * roll back to, e.g. user is the sole contributor. This function
2945          * performs permissions checks on $wgUser, then calls commitRollback()
2946          * to do the dirty work
2947          *
2948          * @param $fromP String: Name of the user whose edits to rollback.
2949          * @param $summary String: Custom summary. Set to default summary if empty.
2950          * @param $token String: Rollback token.
2951          * @param $bot Boolean: If true, mark all reverted edits as bot.
2952          *
2953          * @param $resultDetails Array: contains result-specific array of additional values
2954          *    'alreadyrolled' : 'current' (rev)
2955          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2956          *
2957          * @return array of errors, each error formatted as
2958          *   array(messagekey, param1, param2, ...).
2959          * On success, the array is empty.  This array can also be passed to
2960          * OutputPage::showPermissionsErrorPage().
2961          */
2962         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2963                 global $wgUser;
2964                 $resultDetails = null;
2965
2966                 # Check permissions
2967                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
2968                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
2969                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2970
2971                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2972                         $errors[] = array( 'sessionfailure' );
2973
2974                 if( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
2975                         $errors[] = array( 'actionthrottledtext' );
2976                 }
2977                 # If there were errors, bail out now
2978                 if( !empty( $errors ) )
2979                         return $errors;
2980
2981                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
2982         }
2983
2984         /**
2985          * Backend implementation of doRollback(), please refer there for parameter
2986          * and return value documentation
2987          *
2988          * NOTE: This function does NOT check ANY permissions, it just commits the
2989          * rollback to the DB Therefore, you should only call this function direct-
2990          * ly if you want to use custom permissions checks. If you don't, use
2991          * doRollback() instead.
2992          */
2993         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
2994                 global $wgUseRCPatrol, $wgUser, $wgLang;
2995                 $dbw = wfGetDB( DB_MASTER );
2996
2997                 if( wfReadOnly() ) {
2998                         return array( array( 'readonlytext' ) );
2999                 }
3000
3001                 # Get the last editor
3002                 $current = Revision::newFromTitle( $this->mTitle );
3003                 if( is_null( $current ) ) {
3004                         # Something wrong... no page?
3005                         return array(array('notanarticle'));
3006                 }
3007
3008                 $from = str_replace( '_', ' ', $fromP );
3009                 # User name given should match up with the top revision.
3010                 # If the user was deleted then $from should be empty.
3011                 if( $from != $current->getUserText() ) {
3012                         $resultDetails = array( 'current' => $current );
3013                         return array(array('alreadyrolled',
3014                                 htmlspecialchars($this->mTitle->getPrefixedText()),
3015                                 htmlspecialchars($fromP),
3016                                 htmlspecialchars($current->getUserText())
3017                         ));
3018                 }
3019
3020                 # Get the last edit not by this guy...
3021                 # Note: these may not be public values
3022                 $user = intval( $current->getRawUser() );
3023                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3024                 $s = $dbw->selectRow( 'revision',
3025                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3026                         array(  'rev_page' => $current->getPage(),
3027                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3028                         ), __METHOD__,
3029                         array(  'USE INDEX' => 'page_timestamp',
3030                                 'ORDER BY'  => 'rev_timestamp DESC' )
3031                         );
3032                 if( $s === false ) {
3033                         # No one else ever edited this page
3034                         return array(array('cantrollback'));
3035                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
3036                         # Only admins can see this text
3037                         return array(array('notvisiblerev'));
3038                 }
3039
3040                 $set = array();
3041                 if( $bot && $wgUser->isAllowed('markbotedits') ) {
3042                         # Mark all reverted edits as bot
3043                         $set['rc_bot'] = 1;
3044                 }
3045                 if( $wgUseRCPatrol ) {
3046                         # Mark all reverted edits as patrolled
3047                         $set['rc_patrolled'] = 1;
3048                 }
3049
3050                 if( count($set) ) {
3051                         $dbw->update( 'recentchanges', $set,
3052                                 array( /* WHERE */
3053                                         'rc_cur_id' => $current->getPage(),
3054                                         'rc_user_text' => $current->getUserText(),
3055                                         "rc_timestamp > '{$s->rev_timestamp}'",
3056                                 ), __METHOD__
3057                         );
3058                 }
3059
3060                 # Generate the edit summary if necessary
3061                 $target = Revision::newFromId( $s->rev_id );
3062                 if( empty( $summary ) ) {
3063                         if( $from == '' ) { // no public user name
3064                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3065                         } else {
3066                                 $summary = wfMsgForContent( 'revertpage' );
3067                         }
3068                 }
3069
3070                 # Allow the custom summary to use the same args as the default message
3071                 $args = array(
3072                         $target->getUserText(), $from, $s->rev_id,
3073                         $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
3074                         $current->getId(), $wgLang->timeanddate($current->getTimestamp())
3075                 );
3076                 $summary = wfMsgReplaceArgs( $summary, $args );
3077
3078                 # Save
3079                 $flags = EDIT_UPDATE;
3080
3081                 if( $wgUser->isAllowed('minoredit') )
3082                         $flags |= EDIT_MINOR;
3083
3084                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
3085                         $flags |= EDIT_FORCE_BOT;
3086                 # Actually store the edit
3087                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3088                 if( !empty( $status->value['revision'] ) ) {
3089                         $revId = $status->value['revision']->getId();
3090                 } else {
3091                         $revId = false;
3092                 }
3093
3094                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3095
3096                 $resultDetails = array(
3097                         'summary' => $summary,
3098                         'current' => $current,
3099                         'target'  => $target,
3100                         'newid'   => $revId
3101                 );
3102                 return array();
3103         }
3104
3105         /**
3106          * User interface for rollback operations
3107          */
3108         public function rollback() {
3109                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
3110                 $details = null;
3111
3112                 $result = $this->doRollback(
3113                         $wgRequest->getVal( 'from' ),
3114                         $wgRequest->getText( 'summary' ),
3115                         $wgRequest->getVal( 'token' ),
3116                         $wgRequest->getBool( 'bot' ),
3117                         $details
3118                 );
3119
3120                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
3121                         $wgOut->rateLimited();
3122                         return;
3123                 }
3124                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3125                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3126                         $errArray = $result[0];
3127                         $errMsg = array_shift( $errArray );
3128                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3129                         if( isset( $details['current'] ) ){
3130                                 $current = $details['current'];
3131                                 if( $current->getComment() != '' ) {
3132                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3133                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3134                                 }
3135                         }
3136                         return;
3137                 }
3138                 # Display permissions errors before read-only message -- there's no
3139                 # point in misleading the user into thinking the inability to rollback
3140                 # is only temporary.
3141                 if( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3142                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
3143                         # move any 'readonlytext' error manually.
3144                         $out = array();
3145                         foreach( $result as $error ) {
3146                                 if( $error != array( 'readonlytext' ) ) {
3147                                         $out []= $error;
3148                                 }
3149                         }
3150                         $wgOut->showPermissionsErrorPage( $out );
3151                         return;
3152                 }
3153                 if( $result == array( array( 'readonlytext' ) ) ) {
3154                         $wgOut->readOnlyPage();
3155                         return;
3156                 }
3157
3158                 $current = $details['current'];
3159                 $target = $details['target'];
3160                 $newId = $details['newid'];
3161                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3162                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3163                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
3164                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
3165                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
3166                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
3167                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3168                 $wgOut->returnToMain( false, $this->mTitle );
3169
3170                 if( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3171                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3172                         $de->showDiff( '', '' );
3173                 }
3174         }
3175
3176
3177         /**
3178          * Do standard deferred updates after page view
3179          */
3180         public function viewUpdates() {
3181                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3182                 if ( wfReadOnly() ) {
3183                         return;
3184                 }
3185                 # Don't update page view counters on views from bot users (bug 14044)
3186                 if( !$wgDisableCounters && !$wgUser->isAllowed('bot') && $this->getID() ) {
3187                         Article::incViewCount( $this->getID() );
3188                         $u = new SiteStatsUpdate( 1, 0, 0 );
3189                         array_push( $wgDeferredUpdateList, $u );
3190                 }
3191                 # Update newtalk / watchlist notification status
3192                 $wgUser->clearNotification( $this->mTitle );
3193         }
3194
3195         /**
3196          * Prepare text which is about to be saved.
3197          * Returns a stdclass with source, pst and output members
3198          */
3199         public function prepareTextForEdit( $text, $revid=null ) {
3200                 if( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
3201                         // Already prepared
3202                         return $this->mPreparedEdit;
3203                 }
3204                 global $wgParser;
3205                 $edit = (object)array();
3206                 $edit->revid = $revid;
3207                 $edit->newText = $text;
3208                 $edit->pst = $this->preSaveTransform( $text );
3209                 $options = $this->getParserOptions();
3210                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
3211                 $edit->oldText = $this->getContent();
3212                 $this->mPreparedEdit = $edit;
3213                 return $edit;
3214         }
3215
3216         /**
3217          * Do standard deferred updates after page edit.
3218          * Update links tables, site stats, search index and message cache.
3219          * Purges pages that include this page if the text was changed here.
3220          * Every 100th edit, prune the recent changes table.
3221          *
3222          * @private
3223          * @param $text New text of the article
3224          * @param $summary Edit summary
3225          * @param $minoredit Minor edit
3226          * @param $timestamp_of_pagechange Timestamp associated with the page change
3227          * @param $newid rev_id value of the new revision
3228          * @param $changed Whether or not the content actually changed
3229          */
3230         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
3231                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
3232
3233                 wfProfileIn( __METHOD__ );
3234
3235                 # Parse the text
3236                 # Be careful not to double-PST: $text is usually already PST-ed once
3237                 if( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3238                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3239                         $editInfo = $this->prepareTextForEdit( $text, $newid );
3240                 } else {
3241                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3242                         $editInfo = $this->mPreparedEdit;
3243                 }
3244
3245                 # Save it to the parser cache
3246                 if( $wgEnableParserCache ) {
3247                         $popts = $this->getParserOptions();
3248                         $parserCache = ParserCache::singleton();
3249                         $parserCache->save( $editInfo->output, $this, $popts );
3250                 }
3251
3252                 # Update the links tables
3253                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3254                 $u->doUpdate();
3255
3256                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3257
3258                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3259                         if( 0 == mt_rand( 0, 99 ) ) {
3260                                 // Flush old entries from the `recentchanges` table; we do this on
3261                                 // random requests so as to avoid an increase in writes for no good reason
3262                                 global $wgRCMaxAge;
3263                                 $dbw = wfGetDB( DB_MASTER );
3264                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3265                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3266                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3267                                 $dbw->query( $sql );
3268                         }
3269                 }
3270
3271                 $id = $this->getID();
3272                 $title = $this->mTitle->getPrefixedDBkey();
3273                 $shortTitle = $this->mTitle->getDBkey();
3274
3275                 if( 0 == $id ) {
3276                         wfProfileOut( __METHOD__ );
3277                         return;
3278                 }
3279
3280                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3281                 array_push( $wgDeferredUpdateList, $u );
3282                 $u = new SearchUpdate( $id, $title, $text );
3283                 array_push( $wgDeferredUpdateList, $u );
3284
3285                 # If this is another user's talk page, update newtalk
3286                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3287                 # load of user talk pages and piss people off, nor if it's a minor edit
3288                 # by a properly-flagged bot.
3289                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3290                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
3291                         if( wfRunHooks('ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3292                                 $other = User::newFromName( $shortTitle, false );
3293                                 if( !$other ) {
3294                                         wfDebug( __METHOD__.": invalid username\n" );
3295                                 } elseif( User::isIP( $shortTitle ) ) {
3296                                         // An anonymous user
3297                                         $other->setNewtalk( true );
3298                                 } elseif( $other->isLoggedIn() ) {
3299                                         $other->setNewtalk( true );
3300                                 } else {
3301                                         wfDebug( __METHOD__. ": don't need to notify a nonexistent user\n" );
3302                                 }
3303                         }
3304                 }
3305
3306                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3307                         $wgMessageCache->replace( $shortTitle, $text );
3308                 }
3309
3310                 wfProfileOut( __METHOD__ );
3311         }
3312
3313         /**
3314          * Perform article updates on a special page creation.
3315          *
3316          * @param $rev Revision object
3317          *
3318          * @todo This is a shitty interface function. Kill it and replace the
3319          * other shitty functions like editUpdates and such so it's not needed
3320          * anymore.
3321          */
3322         public function createUpdates( $rev ) {
3323                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3324                 $this->mTotalAdjustment = 1;
3325                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3326                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3327         }
3328
3329         /**
3330          * Generate the navigation links when browsing through an article revisions
3331          * It shows the information as:
3332          *   Revision as of \<date\>; view current revision
3333          *   \<- Previous version | Next Version -\>
3334          *
3335          * @param $oldid String: revision ID of this article revision
3336          */
3337         public function setOldSubtitle( $oldid = 0 ) {
3338                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3339
3340                 if( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3341                         return;
3342                 }
3343
3344                 $revision = Revision::newFromId( $oldid );
3345
3346                 $current = ( $oldid == $this->mLatest );
3347                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3348                 $tddate = $wgLang->date( $this->mTimestamp, true );
3349                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3350                 $sk = $wgUser->getSkin();
3351                 $lnk = $current
3352                         ? wfMsgHtml( 'currentrevisionlink' )
3353                         : $sk->link(
3354                                 $this->mTitle,
3355                                 wfMsgHtml( 'currentrevisionlink' ),
3356                                 array(),
3357                                 array(),
3358                                 array( 'known', 'noclasses' )
3359                         );
3360                 $curdiff = $current
3361                         ? wfMsgHtml( 'diff' )
3362                         : $sk->link(
3363                                 $this->mTitle,
3364                                 wfMsgHtml( 'diff' ),
3365                                 array(),
3366                                 array(
3367                                         'diff' => 'cur',
3368                                         'oldid' => $oldid
3369                                 ),
3370                                 array( 'known', 'noclasses' )
3371                         );
3372                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3373                 $prevlink = $prev
3374                         ? $sk->link(
3375                                 $this->mTitle,
3376                                 wfMsgHtml( 'previousrevision' ),
3377                                 array(),
3378                                 array(
3379                                         'direction' => 'prev',
3380                                         'oldid' => $oldid
3381                                 ),
3382                                 array( 'known', 'noclasses' )
3383                         )
3384                         : wfMsgHtml( 'previousrevision' );
3385                 $prevdiff = $prev
3386                         ? $sk->link(
3387                                 $this->mTitle,
3388                                 wfMsgHtml( 'diff' ),
3389                                 array(),
3390                                 array(
3391                                         'diff' => 'prev',
3392                                         'oldid' => $oldid
3393                                 ),
3394                                 array( 'known', 'noclasses' )
3395                         )
3396                         : wfMsgHtml( 'diff' );
3397                 $nextlink = $current
3398                         ? wfMsgHtml( 'nextrevision' )
3399                         : $sk->link(
3400                                 $this->mTitle,
3401                                 wfMsgHtml( 'nextrevision' ),
3402                                 array(),
3403                                 array(
3404                                         'direction' => 'next',
3405                                         'oldid' => $oldid
3406                                 ),
3407                                 array( 'known', 'noclasses' )
3408                         );
3409                 $nextdiff = $current
3410                         ? wfMsgHtml( 'diff' )
3411                         : $sk->link(
3412                                 $this->mTitle,
3413                                 wfMsgHtml( 'diff' ),
3414                                 array(),
3415                                 array(
3416                                         'diff' => 'next',
3417                                         'oldid' => $oldid
3418                                 ),
3419                                 array( 'known', 'noclasses' )
3420                         );
3421
3422                 $cdel='';
3423                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
3424                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
3425                         if( $revision->isCurrent() ) {
3426                         // We don't handle top deleted edits too well
3427                                 $cdel = wfMsgHtml( 'rev-delundel' );
3428                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3429                         // If revision was hidden from sysops
3430                                 $cdel = wfMsgHtml( 'rev-delundel' );
3431                         } else {
3432                                 $cdel = $sk->link(
3433                                         $revdel,
3434                                         wfMsgHtml('rev-delundel'),
3435                                         array(),
3436                                         array(
3437                                                 'type' => 'revision',
3438                                                 'target' => urlencode( $this->mTitle->getPrefixedDbkey() ),
3439                                                 'ids' => urlencode( $oldid )
3440                                         ),
3441                                         array( 'known', 'noclasses' )
3442                                 );
3443                                 // Bolden oversighted content
3444                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
3445                                         $cdel = "<strong>$cdel</strong>";
3446                         }
3447                         $cdel = "(<small>$cdel</small>) ";
3448                 }
3449                 $unhide = $wgRequest->getInt('unhide') == 1 && $wgUser->matchEditToken( $wgRequest->getVal('token'), $oldid );
3450                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3451                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3452
3453                 $m = wfMsg( 'revision-info-current' );
3454                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3455                         ? 'revision-info-current'
3456                         : 'revision-info';
3457
3458                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3459                         wfMsgExt(
3460                                 $infomsg,
3461                                 array( 'parseinline', 'replaceafter' ),
3462                                 $td,
3463                                 $userlinks,
3464                                 $revision->getID(),
3465                                 $tddate,
3466                                 $tdtime,
3467                                 $revision->getUser()
3468                         ) .
3469                         "</div>\n" .
3470                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3471                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3472                 $wgOut->setSubtitle( $r );
3473         }
3474
3475         /**
3476          * This function is called right before saving the wikitext,
3477          * so we can do things like signatures and links-in-context.
3478          *
3479          * @param $text String
3480          */
3481         public function preSaveTransform( $text ) {
3482                 global $wgParser, $wgUser;
3483                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3484         }
3485
3486         /* Caching functions */
3487
3488         /**
3489          * checkLastModified returns true if it has taken care of all
3490          * output to the client that is necessary for this request.
3491          * (that is, it has sent a cached version of the page)
3492          */
3493         protected function tryFileCache() {
3494                 static $called = false;
3495                 if( $called ) {
3496                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3497                         return false;
3498                 }
3499                 $called = true;
3500                 if( $this->isFileCacheable() ) {
3501                         $cache = new HTMLFileCache( $this->mTitle );
3502                         if( $cache->isFileCacheGood( $this->mTouched ) ) {
3503                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3504                                 $cache->loadFromFileCache();
3505                                 return true;
3506                         } else {
3507                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3508                                 ob_start( array(&$cache, 'saveToFileCache' ) );
3509                         }
3510                 } else {
3511                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3512                 }
3513                 return false;
3514         }
3515
3516         /**
3517          * Check if the page can be cached
3518          * @return bool
3519          */
3520         public function isFileCacheable() {
3521                 $cacheable = false;
3522                 global $wgUseFileCache;
3523                 if( $wgUseFileCache and HTMLFileCache::useFileCache() ) {
3524                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3525                         // Extension may have reason to disable file caching on some pages.
3526                         if( $cacheable ) {
3527                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3528                         }
3529                 }
3530                 return $cacheable;
3531         }
3532
3533         /**
3534          * Loads page_touched and returns a value indicating if it should be used
3535          *
3536          */
3537         public function checkTouched() {
3538                 if( !$this->mDataLoaded ) {
3539                         $this->loadPageData();
3540                 }
3541                 return !$this->mIsRedirect;
3542         }
3543
3544         /**
3545          * Get the page_touched field
3546          */
3547         public function getTouched() {
3548                 # Ensure that page data has been loaded
3549                 if( !$this->mDataLoaded ) {
3550                         $this->loadPageData();
3551                 }
3552                 return $this->mTouched;
3553         }
3554
3555         /**
3556          * Get the page_latest field
3557          */
3558         public function getLatest() {
3559                 if( !$this->mDataLoaded ) {
3560                         $this->loadPageData();
3561                 }
3562                 return (int)$this->mLatest;
3563         }
3564
3565         /**
3566          * Edit an article without doing all that other stuff
3567          * The article must already exist; link tables etc
3568          * are not updated, caches are not flushed.
3569          *
3570          * @param $text String: text submitted
3571          * @param $comment String: comment submitted
3572          * @param $minor Boolean: whereas it's a minor modification
3573          */
3574         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3575                 wfProfileIn( __METHOD__ );
3576
3577                 $dbw = wfGetDB( DB_MASTER );
3578                 $revision = new Revision( array(
3579                         'page'       => $this->getId(),
3580                         'text'       => $text,
3581                         'comment'    => $comment,
3582                         'minor_edit' => $minor ? 1 : 0,
3583                         ) );
3584                 $revision->insertOn( $dbw );
3585                 $this->updateRevisionOn( $dbw, $revision );
3586
3587                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $wgUser) );
3588
3589                 wfProfileOut( __METHOD__ );
3590         }
3591
3592         /**
3593          * Used to increment the view counter
3594          *
3595          * @param $id Integer: article id
3596          */
3597         public static function incViewCount( $id ) {
3598                 $id = intval( $id );
3599                 global $wgHitcounterUpdateFreq, $wgDBtype;
3600
3601                 $dbw = wfGetDB( DB_MASTER );
3602                 $pageTable = $dbw->tableName( 'page' );
3603                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3604                 $acchitsTable = $dbw->tableName( 'acchits' );
3605
3606                 if( $wgHitcounterUpdateFreq <= 1 ) {
3607                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3608                         return;
3609                 }
3610
3611                 # Not important enough to warrant an error page in case of failure
3612                 $oldignore = $dbw->ignoreErrors( true );
3613
3614                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3615
3616                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
3617                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
3618                         # Most of the time (or on SQL errors), skip row count check
3619                         $dbw->ignoreErrors( $oldignore );
3620                         return;
3621                 }
3622
3623                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
3624                 $row = $dbw->fetchObject( $res );
3625                 $rown = intval( $row->n );
3626                 if( $rown >= $wgHitcounterUpdateFreq ){
3627                         wfProfileIn( 'Article::incViewCount-collect' );
3628                         $old_user_abort = ignore_user_abort( true );
3629
3630                         if($wgDBtype == 'mysql')
3631                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
3632                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
3633                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
3634                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
3635                                 'GROUP BY hc_id');
3636                         $dbw->query("DELETE FROM $hitcounterTable");
3637                         if($wgDBtype == 'mysql') {
3638                                 $dbw->query('UNLOCK TABLES');
3639                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3640                                         'WHERE page_id = hc_id');
3641                         }
3642                         else {
3643                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3644                                         "FROM $acchitsTable WHERE page_id = hc_id");
3645                         }
3646                         $dbw->query("DROP TABLE $acchitsTable");
3647
3648                         ignore_user_abort( $old_user_abort );
3649                         wfProfileOut( 'Article::incViewCount-collect' );
3650                 }
3651                 $dbw->ignoreErrors( $oldignore );
3652         }
3653
3654         /**#@+
3655          * The onArticle*() functions are supposed to be a kind of hooks
3656          * which should be called whenever any of the specified actions
3657          * are done.
3658          *
3659          * This is a good place to put code to clear caches, for instance.
3660          *
3661          * This is called on page move and undelete, as well as edit
3662          *
3663          * @param $title a title object
3664          */
3665
3666         public static function onArticleCreate( $title ) {
3667                 # Update existence markers on article/talk tabs...
3668                 if( $title->isTalkPage() ) {
3669                         $other = $title->getSubjectPage();
3670                 } else {
3671                         $other = $title->getTalkPage();
3672                 }
3673                 $other->invalidateCache();
3674                 $other->purgeSquid();
3675
3676                 $title->touchLinks();
3677                 $title->purgeSquid();
3678                 $title->deleteTitleProtection();
3679         }
3680
3681         public static function onArticleDelete( $title ) {
3682                 global $wgMessageCache;
3683                 # Update existence markers on article/talk tabs...
3684                 if( $title->isTalkPage() ) {
3685                         $other = $title->getSubjectPage();
3686                 } else {
3687                         $other = $title->getTalkPage();
3688                 }
3689                 $other->invalidateCache();
3690                 $other->purgeSquid();
3691
3692                 $title->touchLinks();
3693                 $title->purgeSquid();
3694
3695                 # File cache
3696                 HTMLFileCache::clearFileCache( $title );
3697
3698                 # Messages
3699                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
3700                         $wgMessageCache->replace( $title->getDBkey(), false );
3701                 }
3702                 # Images
3703                 if( $title->getNamespace() == NS_FILE ) {
3704                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3705                         $update->doUpdate();
3706                 }
3707                 # User talk pages
3708                 if( $title->getNamespace() == NS_USER_TALK ) {
3709                         $user = User::newFromName( $title->getText(), false );
3710                         $user->setNewtalk( false );
3711                 }
3712                 # Image redirects
3713                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3714         }
3715
3716         /**
3717          * Purge caches on page update etc
3718          */
3719         public static function onArticleEdit( $title, $flags = '' ) {
3720                 global $wgDeferredUpdateList;
3721
3722                 // Invalidate caches of articles which include this page
3723                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3724
3725                 // Invalidate the caches of all pages which redirect here
3726                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3727
3728                 # Purge squid for this page only
3729                 $title->purgeSquid();
3730
3731                 # Clear file cache for this page only
3732                 HTMLFileCache::clearFileCache( $title );
3733         }
3734
3735         /**#@-*/
3736
3737         /**
3738          * Overriden by ImagePage class, only present here to avoid a fatal error
3739          * Called for ?action=revert
3740          */
3741         public function revert() {
3742                 global $wgOut;
3743                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3744         }
3745
3746         /**
3747          * Info about this page
3748          * Called for ?action=info when $wgAllowPageInfo is on.
3749          */
3750         public function info() {
3751                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3752
3753                 if( !$wgAllowPageInfo ) {
3754                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3755                         return;
3756                 }
3757
3758                 $page = $this->mTitle->getSubjectPage();
3759
3760                 $wgOut->setPagetitle( $page->getPrefixedText() );
3761                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3762                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3763
3764                 if( !$this->mTitle->exists() ) {
3765                         $wgOut->addHTML( '<div class="noarticletext">' );
3766                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3767                                 // This doesn't quite make sense; the user is asking for
3768                                 // information about the _page_, not the message... -- RC
3769                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3770                         } else {
3771                                 $msg = $wgUser->isLoggedIn()
3772                                         ? 'noarticletext'
3773                                         : 'noarticletextanon';
3774                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3775                         }
3776                         $wgOut->addHTML( '</div>' );
3777                 } else {
3778                         $dbr = wfGetDB( DB_SLAVE );
3779                         $wl_clause = array(
3780                                 'wl_title'     => $page->getDBkey(),
3781                                 'wl_namespace' => $page->getNamespace() );
3782                         $numwatchers = $dbr->selectField(
3783                                 'watchlist',
3784                                 'COUNT(*)',
3785                                 $wl_clause,
3786                                 __METHOD__,
3787                                 $this->getSelectOptions() );
3788
3789                         $pageInfo = $this->pageCountInfo( $page );
3790                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3791
3792                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3793                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3794                         if( $talkInfo ) {
3795                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3796                         }
3797                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3798                         if( $talkInfo ) {
3799                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3800                         }
3801                         $wgOut->addHTML( '</ul>' );
3802                 }
3803         }
3804
3805         /**
3806          * Return the total number of edits and number of unique editors
3807          * on a given page. If page does not exist, returns false.
3808          *
3809          * @param $title Title object
3810          * @return array
3811          */
3812         public function pageCountInfo( $title ) {
3813                 $id = $title->getArticleId();
3814                 if( $id == 0 ) {
3815                         return false;
3816                 }
3817                 $dbr = wfGetDB( DB_SLAVE );
3818                 $rev_clause = array( 'rev_page' => $id );
3819                 $edits = $dbr->selectField(
3820                         'revision',
3821                         'COUNT(rev_page)',
3822                         $rev_clause,
3823                         __METHOD__,
3824                         $this->getSelectOptions()
3825                 );
3826                 $authors = $dbr->selectField(
3827                         'revision',
3828                         'COUNT(DISTINCT rev_user_text)',
3829                         $rev_clause,
3830                         __METHOD__,
3831                         $this->getSelectOptions()
3832                 );
3833                 return array( 'edits' => $edits, 'authors' => $authors );
3834         }
3835
3836         /**
3837          * Return a list of templates used by this article.
3838          * Uses the templatelinks table
3839          *
3840          * @return Array of Title objects
3841          */
3842         public function getUsedTemplates() {
3843                 $result = array();
3844                 $id = $this->mTitle->getArticleID();
3845                 if( $id == 0 ) {
3846                         return array();
3847                 }
3848                 $dbr = wfGetDB( DB_SLAVE );
3849                 $res = $dbr->select( array( 'templatelinks' ),
3850                         array( 'tl_namespace', 'tl_title' ),
3851                         array( 'tl_from' => $id ),
3852                         __METHOD__ );
3853                 if( $res !== false ) {
3854                         foreach( $res as $row ) {
3855                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3856                         }
3857                 }
3858                 $dbr->freeResult( $res );
3859                 return $result;
3860         }
3861
3862         /**
3863          * Returns a list of hidden categories this page is a member of.
3864          * Uses the page_props and categorylinks tables.
3865          *
3866          * @return Array of Title objects
3867          */
3868         public function getHiddenCategories() {
3869                 $result = array();
3870                 $id = $this->mTitle->getArticleID();
3871                 if( $id == 0 ) {
3872                         return array();
3873                 }
3874                 $dbr = wfGetDB( DB_SLAVE );
3875                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3876                         array( 'cl_to' ),
3877                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3878                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3879                         __METHOD__ );
3880                 if( $res !== false ) {
3881                         foreach( $res as $row ) {
3882                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3883                         }
3884                 }
3885                 $dbr->freeResult( $res );
3886                 return $result;
3887         }
3888
3889         /**
3890         * Return an applicable autosummary if one exists for the given edit.
3891         * @param $oldtext String: the previous text of the page.
3892         * @param $newtext String: The submitted text of the page.
3893         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
3894         * @return string An appropriate autosummary, or an empty string.
3895         */
3896         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3897                 # Decide what kind of autosummary is needed.
3898
3899                 # Redirect autosummaries
3900                 $ot = Title::newFromRedirect( $oldtext );
3901                 $rt = Title::newFromRedirect( $newtext );
3902                 if( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
3903                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3904                 }
3905
3906                 # New page autosummaries
3907                 if( $flags & EDIT_NEW && strlen( $newtext ) ) {
3908                         # If they're making a new article, give its text, truncated, in the summary.
3909                         global $wgContLang;
3910                         $truncatedtext = $wgContLang->truncate(
3911                                 str_replace("\n", ' ', $newtext),
3912                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
3913                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3914                 }
3915
3916                 # Blanking autosummaries
3917                 if( $oldtext != '' && $newtext == '' ) {
3918                         return wfMsgForContent( 'autosumm-blank' );
3919                 } elseif( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500) {
3920                         # Removing more than 90% of the article
3921                         global $wgContLang;
3922                         $truncatedtext = $wgContLang->truncate(
3923                                 $newtext,
3924                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
3925                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3926                 }
3927
3928                 # If we reach this point, there's no applicable autosummary for our case, so our
3929                 # autosummary is empty.
3930                 return '';
3931         }
3932
3933         /**
3934          * Add the primary page-view wikitext to the output buffer
3935          * Saves the text into the parser cache if possible.
3936          * Updates templatelinks if it is out of date.
3937          *
3938          * @param $text String
3939          * @param $cache Boolean
3940          */
3941         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
3942                 global $wgOut;
3943
3944                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
3945                 $wgOut->addParserOutput( $this->mParserOutput );
3946         }
3947
3948         /**
3949          * This does all the heavy lifting for outputWikitext, except it returns the parser
3950          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
3951          * say, embedding thread pages within a discussion system (LiquidThreads)
3952          */
3953         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
3954                 global $wgParser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
3955
3956                 if ( !$parserOptions ) {
3957                         $parserOptions = $this->getParserOptions();
3958                 }
3959
3960                 $time = -wfTime();
3961                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
3962                         $parserOptions, true, true, $this->getRevIdFetched() );
3963                 $time += wfTime();
3964
3965                 # Timing hack
3966                 if( $time > 3 ) {
3967                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
3968                                 $this->mTitle->getPrefixedDBkey()));
3969                 }
3970
3971                 if( $wgEnableParserCache && $cache && $this && $this->mParserOutput->getCacheTime() != -1 ) {
3972                         $parserCache = ParserCache::singleton();
3973                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
3974                 }
3975                 // Make sure file cache is not used on uncacheable content.
3976                 // Output that has magic words in it can still use the parser cache
3977                 // (if enabled), though it will generally expire sooner.
3978                 if( $this->mParserOutput->getCacheTime() == -1 || $this->mParserOutput->containsOldMagic() ) {
3979                         $wgUseFileCache = false;
3980                 }
3981                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
3982                 return $this->mParserOutput;
3983         }
3984
3985         /**
3986          * Get parser options suitable for rendering the primary article wikitext
3987          */
3988         public function getParserOptions() {
3989                 global $wgUser;
3990                 if ( !$this->mParserOptions ) {
3991                         $this->mParserOptions = new ParserOptions( $wgUser );
3992                         $this->mParserOptions->setTidy( true );
3993                         $this->mParserOptions->enableLimitReport();
3994                 }
3995                 return $this->mParserOptions;
3996         }
3997
3998         protected function doCascadeProtectionUpdates( $parserOutput ) {
3999                 if( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4000                         return;
4001                 }
4002
4003                 // templatelinks table may have become out of sync,
4004                 // especially if using variable-based transclusions.
4005                 // For paranoia, check if things have changed and if
4006                 // so apply updates to the database. This will ensure
4007                 // that cascaded protections apply as soon as the changes
4008                 // are visible.
4009
4010                 # Get templates from templatelinks
4011                 $id = $this->mTitle->getArticleID();
4012
4013                 $tlTemplates = array();
4014
4015                 $dbr = wfGetDB( DB_SLAVE );
4016                 $res = $dbr->select( array( 'templatelinks' ),
4017                         array( 'tl_namespace', 'tl_title' ),
4018                         array( 'tl_from' => $id ),
4019                         __METHOD__ );
4020
4021                 global $wgContLang;
4022                 foreach( $res as $row ) {
4023                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4024                 }
4025
4026                 # Get templates from parser output.
4027                 $poTemplates = array();
4028                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4029                         foreach ( $templates as $dbk => $id ) {
4030                                 $poTemplates["$ns:$dbk"] = true;
4031                         }
4032                 }
4033
4034                 # Get the diff
4035                 # Note that we simulate array_diff_key in PHP <5.0.x
4036                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4037
4038                 if( count( $templates_diff ) > 0 ) {
4039                         # Whee, link updates time.
4040                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4041                         $u->doUpdate();
4042                 }
4043         }
4044
4045         /**
4046          * Update all the appropriate counts in the category table, given that
4047          * we've added the categories $added and deleted the categories $deleted.
4048          *
4049          * @param $added array   The names of categories that were added
4050          * @param $deleted array The names of categories that were deleted
4051          * @return null
4052          */
4053         public function updateCategoryCounts( $added, $deleted ) {
4054                 $ns = $this->mTitle->getNamespace();
4055                 $dbw = wfGetDB( DB_MASTER );
4056
4057                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4058                 # exist, we might legitimately not create it, but it's simpler to just
4059                 # create it and then give it a negative value, since the value is bogus
4060                 # anyway.
4061                 #
4062                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4063                 $insertCats = array_merge( $added, $deleted );
4064                 if( !$insertCats ) {
4065                         # Okay, nothing to do
4066                         return;
4067                 }
4068                 $insertRows = array();
4069                 foreach( $insertCats as $cat ) {
4070                         $insertRows[] = array( 'cat_title' => $cat );
4071                 }
4072                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4073
4074                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4075                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4076                 if( $ns == NS_CATEGORY ) {
4077                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4078                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4079                 } elseif( $ns == NS_FILE ) {
4080                         $addFields[]    = 'cat_files = cat_files + 1';
4081                         $removeFields[] = 'cat_files = cat_files - 1';
4082                 }
4083
4084                 if( $added ) {
4085                         $dbw->update(
4086                                 'category',
4087                                 $addFields,
4088                                 array( 'cat_title' => $added ),
4089                                 __METHOD__
4090                         );
4091                 }
4092                 if( $deleted ) {
4093                         $dbw->update(
4094                                 'category',
4095                                 $removeFields,
4096                                 array( 'cat_title' => $deleted ),
4097                                 __METHOD__
4098                         );
4099                 }
4100         }
4101
4102         /** Lightweight method to get the parser output for a page, checking the parser cache
4103           * and so on. Doesn't consider most of the stuff that Article::view is forced to
4104           * consider, so it's not appropriate to use there. */
4105         function getParserOutput( $oldid = null ) {
4106                 global $wgEnableParserCache, $wgUser, $wgOut;
4107
4108                 // Should the parser cache be used?
4109                 $useParserCache = $wgEnableParserCache &&
4110                           intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
4111                           $this->exists() &&
4112                                   $oldid === null;
4113
4114                 wfDebug( __METHOD__.': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4115                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
4116                         wfIncrStats( 'pcache_miss_stub' );
4117                 }
4118
4119                 $parserOutput = false;
4120                 if ( $useParserCache ) {
4121                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4122                 }
4123
4124                 if ( $parserOutput === false ) {
4125                         // Cache miss; parse and output it.
4126                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4127
4128                         return $this->getOutputFromWikitext( $rev->getText(), $useParserCache );
4129                 } else {
4130                         return $parserOutput;
4131                 }
4132         }
4133 }