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         /**@}}*/
  44
  45         /**
  46          * Constructor and clear the article
  47          * @param $title Reference to a Title object.
  48          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  49          */
  50         public function __construct( Title $title, $oldId = null ) {
  51                 $this->mTitle =& $title;
  52                 $this->mOldId = $oldId;
  53         }
  54
  55         /**
  56          * Constructor from an article article
  57          * @param $id The article ID to load
  58          */
  59         public static function newFromID( $id ) {
  60                 $t = Title::newFromID( $id );
  61                 return $t == null ? null : new Article( $t );
  62         }
  63
  64         /**
  65          * Tell the page view functions that this view was redirected
  66          * from another page on the wiki.
  67          * @param $from Title object.
  68          */
  69         public function setRedirectedFrom( $from ) {
  70                 $this->mRedirectedFrom = $from;
  71         }
  72
  73         /**
  74          * If this page is a redirect, get its target
  75          *
  76          * The target will be fetched from the redirect table if possible.
  77          * If this page doesn't have an entry there, call insertRedirect()
  78          * @return mixed Title object, or null if this page is not a redirect
  79          */
  80         public function getRedirectTarget() {
  81                 if( !$this->mTitle || !$this->mTitle->isRedirect() )
  82                         return null;
  83                 if( !is_null($this->mRedirectTarget) )
  84                         return $this->mRedirectTarget;
  85                 # Query the redirect table
  86                 $dbr = wfGetDB( DB_SLAVE );
  87                 $row = $dbr->selectRow( 'redirect',
  88                         array('rd_namespace', 'rd_title'),
  89                         array('rd_from' => $this->getID() ),
  90                         __METHOD__
  91                 );
  92                 if( $row ) {
  93                         return $this->mRedirectTarget = Title::makeTitle($row->rd_namespace, $row->rd_title);
  94                 }
  95                 # This page doesn't have an entry in the redirect table
  96                 return $this->mRedirectTarget = $this->insertRedirect();
  97         }
  98
  99         /**
 100          * Insert an entry for this page into the redirect table.
 101          *
 102          * Don't call this function directly unless you know what you're doing.
 103          * @return Title object
 104          */
 105         public function insertRedirect() {
 106                 $retval = Title::newFromRedirect( $this->getContent() );
 107                 if( !$retval ) {
 108                         return null;
 109                 }
 110                 $dbw = wfGetDB( DB_MASTER );
 111                 $dbw->replace( 'redirect', array('rd_from'),
 112                         array(
 113                                 'rd_from' => $this->getID(),
 114                                 'rd_namespace' => $retval->getNamespace(),
 115                                 'rd_title' => $retval->getDBKey()
 116                         ),
 117                         __METHOD__
 118                 );
 119                 return $retval;
 120         }
 121
 122         /**
 123          * Get the Title object this page redirects to
 124          *
 125          * @return mixed false, Title of in-wiki target, or string with URL
 126          */
 127         public function followRedirect() {
 128                 $text = $this->getContent();
 129                 return $this->followRedirectText( $text );
 130         }
 131
 132         /**
 133          * Get the Title object this text redirects to
 134          *
 135          * @return mixed false, Title of in-wiki target, or string with URL
 136          */
 137         public function followRedirectText( $text ) {
 138                 $rt = Title::newFromRedirectRecurse( $text ); // recurse through to only get the final target
 139                 # process if title object is valid and not special:userlogout
 140                 if( $rt ) {
 141                         if( $rt->getInterwiki() != '' ) {
 142                                 if( $rt->isLocal() ) {
 143                                         // Offsite wikis need an HTTP redirect.
 144                                         //
 145                                         // This can be hard to reverse and may produce loops,
 146                                         // so they may be disabled in the site configuration.
 147                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 148                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 149                                 }
 150                         } else {
 151                                 if( $rt->getNamespace() == NS_SPECIAL ) {
 152                                         // Gotta handle redirects to special pages differently:
 153                                         // Fill the HTTP response "Location" header and ignore
 154                                         // the rest of the page we're on.
 155                                         //
 156                                         // This can be hard to reverse, so they may be disabled.
 157                                         if( $rt->isSpecial( 'Userlogout' ) ) {
 158                                                 // rolleyes
 159                                         } else {
 160                                                 return $rt->getFullURL();
 161                                         }
 162                                 }
 163                                 return $rt;
 164                         }
 165                 }
 166                 // No or invalid redirect
 167                 return false;
 168         }
 169
 170         /**
 171          * get the title object of the article
 172          */
 173         public function getTitle() {
 174                 return $this->mTitle;
 175         }
 176
 177         /**
 178          * Clear the object
 179          * @private
 180          */
 181         public function clear() {
 182                 $this->mDataLoaded    = false;
 183                 $this->mContentLoaded = false;
 184
 185                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 186                 $this->mRedirectedFrom = null; # Title object if set
 187                 $this->mRedirectTarget = null; # Title object if set
 188                 $this->mUserText =
 189                 $this->mTimestamp = $this->mComment = '';
 190                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 191                 $this->mTouched = '19700101000000';
 192                 $this->mForUpdate = false;
 193                 $this->mIsRedirect = false;
 194                 $this->mRevIdFetched = 0;
 195                 $this->mRedirectUrl = false;
 196                 $this->mLatest = false;
 197                 $this->mPreparedEdit = false;
 198         }
 199
 200         /**
 201          * Note that getContent/loadContent do not follow redirects anymore.
 202          * If you need to fetch redirectable content easily, try
 203          * the shortcut in Article::followContent()
 204          *
 205          * @return Return the text of this revision
 206         */
 207         public function getContent() {
 208                 global $wgUser, $wgContLang, $wgOut, $wgMessageCache;
 209                 wfProfileIn( __METHOD__ );
 210                 if( $this->getID() === 0 ) {
 211                         # If this is a MediaWiki:x message, then load the messages
 212                         # and return the message value for x.
 213                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 214                                 # If this is a system message, get the default text.
 215                                 list( $message, $lang ) = $wgMessageCache->figureMessage( $wgContLang->lcfirst( $this->mTitle->getText() ) );
 216                                 $wgMessageCache->loadAllMessages( $lang );
 217                                 $text = wfMsgGetKey( $message, false, $lang, false );
 218                                 if( wfEmptyMsg( $message, $text ) )
 219                                         $text = '';
 220                         } else {
 221                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 222                         }
 223                         wfProfileOut( __METHOD__ );
 224                         return $text;
 225                 } else {
 226                         $this->loadContent();
 227                         wfProfileOut( __METHOD__ );
 228                         return $this->mContent;
 229                 }
 230         }
 231
 232         /**
 233          * Get the text of the current revision. No side-effects...
 234          *
 235          * @return Return the text of the current revision
 236         */
 237         public function getRawText() {
 238                 // Check process cache for current revision
 239                 if( $this->mContentLoaded && $this->mOldId == 0 ) {
 240                         return $this->mContent;
 241                 }
 242                 $rev = Revision::newFromTitle( $this->mTitle );
 243                 $text = $rev ? $rev->getRawText() : false;
 244                 return $text;
 245         }
 246
 247         /**
 248          * This function returns the text of a section, specified by a number ($section).
 249          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 250          * the first section before any such heading (section 0).
 251          *
 252          * If a section contains subsections, these are also returned.
 253          *
 254          * @param $text String: text to look in
 255          * @param $section Integer: section number
 256          * @return string text of the requested section
 257          * @deprecated
 258          */
 259         public function getSection( $text, $section ) {
 260                 global $wgParser;
 261                 return $wgParser->getSection( $text, $section );
 262         }
 263
 264         /**
 265          * Get the text that needs to be saved in order to undo all revisions
 266          * between $undo and $undoafter. Revisions must belong to the same page,
 267          * must exist and must not be deleted
 268          * @param $undo Revision
 269          * @param $undoafter Revision Must be an earlier revision than $undo
 270          * @return mixed string on success, false on failure
 271          */
 272         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 273                 $undo_text = $undo->getText();
 274                 $undoafter_text = $undoafter->getText();
 275                 $cur_text = $this->getContent();
 276                 if ( $cur_text == $undo_text ) {
 277                         # No use doing a merge if it's just a straight revert.
 278                         return $undoafter_text;
 279                 }
 280                 $undone_text = '';
 281                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) )
 282                         return false;
 283                 return $undone_text;
 284         }
 285
 286         /**
 287          * @return int The oldid of the article that is to be shown, 0 for the
 288          *             current revision
 289          */
 290         public function getOldID() {
 291                 if( is_null( $this->mOldId ) ) {
 292                         $this->mOldId = $this->getOldIDFromRequest();
 293                 }
 294                 return $this->mOldId;
 295         }
 296
 297         /**
 298          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 299          *
 300          * @return int The old id for the request
 301          */
 302         public function getOldIDFromRequest() {
 303                 global $wgRequest;
 304                 $this->mRedirectUrl = false;
 305                 $oldid = $wgRequest->getVal( 'oldid' );
 306                 if( isset( $oldid ) ) {
 307                         $oldid = intval( $oldid );
 308                         if( $wgRequest->getVal( 'direction' ) == 'next' ) {
 309                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 310                                 if( $nextid  ) {
 311                                         $oldid = $nextid;
 312                                 } else {
 313                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 314                                 }
 315                         } elseif( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 316                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 317                                 if( $previd ) {
 318                                         $oldid = $previd;
 319                                 }
 320                         }
 321                 }
 322                 if( !$oldid ) {
 323                         $oldid = 0;
 324                 }
 325                 return $oldid;
 326         }
 327
 328         /**
 329          * Load the revision (including text) into this object
 330          */
 331         function loadContent() {
 332                 if( $this->mContentLoaded ) return;
 333                 wfProfileIn( __METHOD__ );
 334                 # Query variables :P
 335                 $oldid = $this->getOldID();
 336                 # Pre-fill content with error message so that if something
 337                 # fails we'll have something telling us what we intended.
 338                 $this->mOldId = $oldid;
 339                 $this->fetchContent( $oldid );
 340                 wfProfileOut( __METHOD__ );
 341         }
 342
 343
 344         /**
 345          * Fetch a page record with the given conditions
 346          * @param $dbr Database object
 347          * @param $conditions Array
 348          */
 349         protected function pageData( $dbr, $conditions ) {
 350                 $fields = array(
 351                                 'page_id',
 352                                 'page_namespace',
 353                                 'page_title',
 354                                 'page_restrictions',
 355                                 'page_counter',
 356                                 'page_is_redirect',
 357                                 'page_is_new',
 358                                 'page_random',
 359                                 'page_touched',
 360                                 'page_latest',
 361                                 'page_len',
 362                 );
 363                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 364                 $row = $dbr->selectRow(
 365                         'page',
 366                         $fields,
 367                         $conditions,
 368                         __METHOD__
 369                 );
 370                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 371                 return $row ;
 372         }
 373
 374         /**
 375          * @param $dbr Database object
 376          * @param $title Title object
 377          */
 378         public function pageDataFromTitle( $dbr, $title ) {
 379                 return $this->pageData( $dbr, array(
 380                         'page_namespace' => $title->getNamespace(),
 381                         'page_title'     => $title->getDBkey() ) );
 382         }
 383
 384         /**
 385          * @param $dbr Database
 386          * @param $id Integer
 387          */
 388         protected function pageDataFromId( $dbr, $id ) {
 389                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 390         }
 391
 392         /**
 393          * Set the general counter, title etc data loaded from
 394          * some source.
 395          *
 396          * @param $data Database row object or "fromdb"
 397          */
 398         public function loadPageData( $data = 'fromdb' ) {
 399                 if( $data === 'fromdb' ) {
 400                         $dbr = wfGetDB( DB_MASTER );
 401                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 402                 }
 403
 404                 $lc = LinkCache::singleton();
 405                 if( $data ) {
 406                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 407
 408                         $this->mTitle->mArticleID = $data->page_id;
 409
 410                         # Old-fashioned restrictions
 411                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 412
 413                         $this->mCounter     = $data->page_counter;
 414                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 415                         $this->mIsRedirect  = $data->page_is_redirect;
 416                         $this->mLatest      = $data->page_latest;
 417                 } else {
 418                         if( is_object( $this->mTitle ) ) {
 419                                 $lc->addBadLinkObj( $this->mTitle );
 420                         }
 421                         $this->mTitle->mArticleID = 0;
 422                 }
 423
 424                 $this->mDataLoaded  = true;
 425         }
 426
 427         /**
 428          * Get text of an article from database
 429          * Does *NOT* follow redirects.
 430          * @param $oldid Int: 0 for whatever the latest revision is
 431          * @return string
 432          */
 433         function fetchContent( $oldid = 0 ) {
 434                 if( $this->mContentLoaded ) {
 435                         return $this->mContent;
 436                 }
 437
 438                 $dbr = wfGetDB( DB_MASTER );
 439
 440                 # Pre-fill content with error message so that if something
 441                 # fails we'll have something telling us what we intended.
 442                 $t = $this->mTitle->getPrefixedText();
 443                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 444                 $this->mContent = wfMsg( 'missing-article', $t, $d ) ;
 445
 446                 if( $oldid ) {
 447                         $revision = Revision::newFromId( $oldid );
 448                         if( is_null( $revision ) ) {
 449                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 450                                 return false;
 451                         }
 452                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 453                         if( !$data ) {
 454                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 455                                 return false;
 456                         }
 457                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 458                         $this->loadPageData( $data );
 459                 } else {
 460                         if( !$this->mDataLoaded ) {
 461                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 462                                 if( !$data ) {
 463                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 464                                         return false;
 465                                 }
 466                                 $this->loadPageData( $data );
 467                         }
 468                         $revision = Revision::newFromId( $this->mLatest );
 469                         if( is_null( $revision ) ) {
 470                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$this->mLatest}\n" );
 471                                 return false;
 472                         }
 473                 }
 474
 475                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 476                 // We should instead work with the Revision object when we need it...
 477                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 478
 479                 $this->mUser      = $revision->getUser();
 480                 $this->mUserText  = $revision->getUserText();
 481                 $this->mComment   = $revision->getComment();
 482                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 483
 484                 $this->mRevIdFetched = $revision->getId();
 485                 $this->mContentLoaded = true;
 486                 $this->mRevision =& $revision;
 487
 488                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 489
 490                 return $this->mContent;
 491         }
 492
 493         /**
 494          * Read/write accessor to select FOR UPDATE
 495          *
 496          * @param $x Mixed: FIXME
 497          */
 498         public function forUpdate( $x = NULL ) {
 499                 return wfSetVar( $this->mForUpdate, $x );
 500         }
 501
 502         /**
 503          * Get the database which should be used for reads
 504          *
 505          * @return Database
 506          * @deprecated - just call wfGetDB( DB_MASTER ) instead
 507          */
 508         function getDB() {
 509                 wfDeprecated( __METHOD__ );
 510                 return wfGetDB( DB_MASTER );
 511         }
 512
 513         /**
 514          * Get options for all SELECT statements
 515          *
 516          * @param $options Array: an optional options array which'll be appended to
 517          *                       the default
 518          * @return Array: options
 519          */
 520         protected function getSelectOptions( $options = '' ) {
 521                 if( $this->mForUpdate ) {
 522                         if( is_array( $options ) ) {
 523                                 $options[] = 'FOR UPDATE';
 524                         } else {
 525                                 $options = 'FOR UPDATE';
 526                         }
 527                 }
 528                 return $options;
 529         }
 530
 531         /**
 532          * @return int Page ID
 533          */
 534         public function getID() {
 535                 if( $this->mTitle ) {
 536                         return $this->mTitle->getArticleID();
 537                 } else {
 538                         return 0;
 539                 }
 540         }
 541
 542         /**
 543          * @return bool Whether or not the page exists in the database
 544          */
 545         public function exists() {
 546                 return $this->getId() > 0;
 547         }
 548
 549         /**
 550          * Check if this page is something we're going to be showing
 551          * some sort of sensible content for. If we return false, page
 552          * views (plain action=view) will return an HTTP 404 response,
 553          * so spiders and robots can know they're following a bad link.
 554          *
 555          * @return bool
 556          */
 557         public function hasViewableContent() {
 558                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 559         }
 560
 561         /**
 562          * @return int The view count for the page
 563          */
 564         public function getCount() {
 565                 if( -1 == $this->mCounter ) {
 566                         $id = $this->getID();
 567                         if( $id == 0 ) {
 568                                 $this->mCounter = 0;
 569                         } else {
 570                                 $dbr = wfGetDB( DB_SLAVE );
 571                                 $this->mCounter = $dbr->selectField( 'page',
 572                                         'page_counter',
 573                                         array( 'page_id' => $id ),
 574                                         __METHOD__,
 575                                         $this->getSelectOptions()
 576                                 );
 577                         }
 578                 }
 579                 return $this->mCounter;
 580         }
 581
 582         /**
 583          * Determine whether a page  would be suitable for being counted as an
 584          * article in the site_stats table based on the title & its content
 585          *
 586          * @param $text String: text to analyze
 587          * @return bool
 588          */
 589         public function isCountable( $text ) {
 590                 global $wgUseCommaCount;
 591
 592                 $token = $wgUseCommaCount ? ',' : '[[';
 593                 return $this->mTitle->isContentPage() && !$this->isRedirect($text) && in_string($token,$text);
 594         }
 595
 596         /**
 597          * Tests if the article text represents a redirect
 598          *
 599          * @param $text String: FIXME
 600          * @return bool
 601          */
 602         public function isRedirect( $text = false ) {
 603                 if( $text === false ) {
 604                         if( $this->mDataLoaded ) {
 605                                 return $this->mIsRedirect;
 606                         }
 607                         // Apparently loadPageData was never called
 608                         $this->loadContent();
 609                         $titleObj = Title::newFromRedirectRecurse( $this->fetchContent() );
 610                 } else {
 611                         $titleObj = Title::newFromRedirect( $text );
 612                 }
 613                 return $titleObj !== NULL;
 614         }
 615
 616         /**
 617          * Returns true if the currently-referenced revision is the current edit
 618          * to this page (and it exists).
 619          * @return bool
 620          */
 621         public function isCurrent() {
 622                 # If no oldid, this is the current version.
 623                 if( $this->getOldID() == 0 ) {
 624                         return true;
 625                 }
 626                 return $this->exists() && isset($this->mRevision) && $this->mRevision->isCurrent();
 627         }
 628
 629         /**
 630          * Loads everything except the text
 631          * This isn't necessary for all uses, so it's only done if needed.
 632          */
 633         protected function loadLastEdit() {
 634                 if( -1 != $this->mUser )
 635                         return;
 636
 637                 # New or non-existent articles have no user information
 638                 $id = $this->getID();
 639                 if( 0 == $id ) return;
 640
 641                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 642                 if( !is_null( $this->mLastRevision ) ) {
 643                         $this->mUser      = $this->mLastRevision->getUser();
 644                         $this->mUserText  = $this->mLastRevision->getUserText();
 645                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 646                         $this->mComment   = $this->mLastRevision->getComment();
 647                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 648                         $this->mRevIdFetched = $this->mLastRevision->getId();
 649                 }
 650         }
 651
 652         public function getTimestamp() {
 653                 // Check if the field has been filled by ParserCache::get()
 654                 if( !$this->mTimestamp ) {
 655                         $this->loadLastEdit();
 656                 }
 657                 return wfTimestamp(TS_MW, $this->mTimestamp);
 658         }
 659
 660         public function getUser() {
 661                 $this->loadLastEdit();
 662                 return $this->mUser;
 663         }
 664
 665         public function getUserText() {
 666                 $this->loadLastEdit();
 667                 return $this->mUserText;
 668         }
 669
 670         public function getComment() {
 671                 $this->loadLastEdit();
 672                 return $this->mComment;
 673         }
 674
 675         public function getMinorEdit() {
 676                 $this->loadLastEdit();
 677                 return $this->mMinorEdit;
 678         }
 679
 680         /* Use this to fetch the rev ID used on page views */
 681         public function getRevIdFetched() {
 682                 $this->loadLastEdit();
 683                 return $this->mRevIdFetched;
 684         }
 685
 686         /**
 687          * @param $limit Integer: default 0.
 688          * @param $offset Integer: default 0.
 689          */
 690         public function getContributors($limit = 0, $offset = 0) {
 691                 # XXX: this is expensive; cache this info somewhere.
 692
 693                 $contribs = array();
 694                 $dbr = wfGetDB( DB_SLAVE );
 695                 $revTable = $dbr->tableName( 'revision' );
 696                 $userTable = $dbr->tableName( 'user' );
 697                 $user = $this->getUser();
 698                 $pageId = $this->getId();
 699
 700                 $sql = "SELECT {$userTable}.*, MAX(rev_timestamp) as timestamp
 701                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 702                         WHERE rev_page = $pageId
 703                         AND rev_user != $user
 704                         GROUP BY rev_user, rev_user_text, user_real_name
 705                         ORDER BY timestamp DESC";
 706
 707                 if($limit > 0) { $sql .= ' LIMIT '.$limit; }
 708                 if($offset > 0) { $sql .= ' OFFSET '.$offset; }
 709
 710                 $sql .= ' '. $this->getSelectOptions();
 711
 712                 $res = $dbr->query($sql, __METHOD__ );
 713
 714                 return new UserArrayFromResult( $res );
 715         }
 716
 717         /**
 718          * This is the default action of the script: just view the page of
 719          * the given title.
 720         */
 721         public function view() {
 722                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 723                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 724                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 725                 global $wgDefaultRobotPolicy;
 726
 727                 wfProfileIn( __METHOD__ );
 728
 729                 # Get variables from query string
 730                 $oldid = $this->getOldID();
 731
 732                 # Try client and file cache
 733                 if( $oldid === 0 && $this->checkTouched() ) {
 734                         global $wgUseETag;
 735                         if( $wgUseETag ) {
 736                                 $parserCache = ParserCache::singleton();
 737                                 $wgOut->setETag( $parserCache->getETag($this,$wgUser) );
 738                         }
 739                         # Is is client cached?
 740                         if( $wgOut->checkLastModified( $this->getTouched() ) ) {
 741                                 wfProfileOut( __METHOD__ );
 742                                 return;
 743                         # Try file cache
 744                         } else if( $this->tryFileCache() ) {
 745                                 # tell wgOut that output is taken care of
 746                                 $wgOut->disable();
 747                                 $this->viewUpdates();
 748                                 wfProfileOut( __METHOD__ );
 749                                 return;
 750                         }
 751                 }
 752
 753                 $ns = $this->mTitle->getNamespace(); # shortcut
 754                 $sk = $wgUser->getSkin();
 755
 756                 # getOldID may want us to redirect somewhere else
 757                 if( $this->mRedirectUrl ) {
 758                         $wgOut->redirect( $this->mRedirectUrl );
 759                         wfProfileOut( __METHOD__ );
 760                         return;
 761                 }
 762
 763                 $diff = $wgRequest->getVal( 'diff' );
 764                 $rcid = $wgRequest->getVal( 'rcid' );
 765                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 766                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 767                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 768                 $return404 = false;
 769
 770                 $wgOut->setArticleFlag( true );
 771
 772                 # Discourage indexing of printable versions, but encourage following
 773                 if( $wgOut->isPrintable() ) {
 774                         $policy = 'noindex,follow';
 775                 } elseif( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 776                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 777                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 778                         # Honour customised robot policies for this namespace
 779                         $policy = $wgNamespaceRobotPolicies[$ns];
 780                 } else {
 781                         $policy = $wgDefaultRobotPolicy;
 782                 }
 783                 $wgOut->setRobotPolicy( $policy );
 784
 785                 # Allow admins to see deleted content if explicitly requested
 786                 $delId = $diff ? $diff : $oldid;
 787                 $unhide = $wgRequest->getInt('unhide') == 1 && $wgUser->matchEditToken( $wgRequest->getVal('token'), $delId );
 788                 # If we got diff and oldid in the query, we want to see a
 789                 # diff page instead of the article.
 790
 791                 if( !is_null( $diff ) ) {
 792                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 793
 794                         $htmldiff = $wgRequest->getVal( 'htmldiff' , false);
 795                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $htmldiff, $unhide );
 796                         // DifferenceEngine directly fetched the revision:
 797                         $this->mRevIdFetched = $de->mNewid;
 798                         $de->showDiffPage( $diffOnly );
 799
 800                         // Needed to get the page's current revision
 801                         $this->loadPageData();
 802                         if( $diff == 0 || $diff == $this->mLatest ) {
 803                                 # Run view updates for current revision only
 804                                 $this->viewUpdates();
 805                         }
 806                         wfProfileOut( __METHOD__ );
 807                         return;
 808                 }
 809
 810                 if( $ns == NS_USER || $ns == NS_USER_TALK ) {
 811                         # User/User_talk subpages are not modified. (bug 11443)
 812                         if( !$this->mTitle->isSubpage() ) {
 813                                 $block = new Block();
 814                                 if( $block->load( $this->mTitle->getBaseText() ) ) {
 815                                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 816                                 }
 817                         }
 818                 }
 819
 820                 # Should the parser cache be used?
 821                 $pcache = $this->useParserCache( $oldid );
 822                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 823                 if( $wgUser->getOption( 'stubthreshold' ) ) {
 824                         wfIncrStats( 'pcache_miss_stub' );
 825                 }
 826
 827                 $wasRedirected = false;
 828                 if( isset( $this->mRedirectedFrom ) ) {
 829                         // This is an internally redirected page view.
 830                         // We'll need a backlink to the source page for navigation.
 831                         if( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 832                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 833                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 834                                 $wgOut->setSubtitle( $s );
 835
 836                                 // Set the fragment if one was specified in the redirect
 837                                 if( strval( $this->mTitle->getFragment() ) != '' ) {
 838                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 839                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 840                                 }
 841
 842                                 // Add a <link rel="canonical"> tag
 843                                 $wgOut->addLink( array( 'rel' => 'canonical',
 844                                         'href' => $this->mTitle->getLocalURL() )
 845                                 );
 846                                 $wasRedirected = true;
 847                         }
 848                 } elseif( !empty( $rdfrom ) ) {
 849                         // This is an externally redirected view, from some other wiki.
 850                         // If it was reported from a trusted site, supply a backlink.
 851                         global $wgRedirectSources;
 852                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 853                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 854                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 855                                 $wgOut->setSubtitle( $s );
 856                                 $wasRedirected = true;
 857                         }
 858                 }
 859
 860                 $outputDone = false;
 861                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 862                 if( $pcache && $wgOut->tryParserCache( $this, $wgUser ) ) {
 863                         // Ensure that UI elements requiring revision ID have
 864                         // the correct version information.
 865                         $wgOut->setRevisionId( $this->mLatest );
 866                         $outputDone = true;
 867                 }
 868                 # Fetch content and check for errors
 869                 if( !$outputDone ) {
 870                         # If the article does not exist and was deleted, show the log
 871                         if( $this->getID() == 0 ) {
 872                                 $this->showDeletionLog();
 873                         }
 874                         $text = $this->getContent();
 875                         // For now, check also for ID until getContent actually returns
 876                         // false for pages that do not exists
 877                         if( $text === false || $this->getID() === 0 ) {
 878                                 # Failed to load, replace text with error message
 879                                 $t = $this->mTitle->getPrefixedText();
 880                                 if( $oldid ) {
 881                                         $d = wfMsgExt( 'missingarticle-rev', 'escape', $oldid );
 882                                         $text = wfMsgExt( 'missing-article', 'parsemag', $t, $d );
 883                                 // Always use page content for pages in the MediaWiki namespace
 884                                 // since it contains the default message
 885                                 } elseif ( $this->mTitle->getNamespace() != NS_MEDIAWIKI ) {
 886                                         $text = wfMsgExt( 'noarticletext', 'parsemag' );
 887                                 }
 888                         }
 889
 890                         # Non-existent pages
 891                         if( $this->getID() === 0 ) {
 892                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 893                                 $text = "<div class='noarticletext'>\n$text\n</div>";
 894                                 if( !$this->hasViewableContent() ) {
 895                                         // If there's no backing content, send a 404 Not Found
 896                                         // for better machine handling of broken links.
 897                                         $return404 = true;
 898                                 }
 899                         }
 900
 901                         if( $return404 ) {
 902                                 $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
 903                         }
 904
 905                         # Another whitelist check in case oldid is altering the title
 906                         if( !$this->mTitle->userCanRead() ) {
 907                                 $wgOut->loginToUse();
 908                                 $wgOut->output();
 909                                 $wgOut->disable();
 910                                 wfProfileOut( __METHOD__ );
 911                                 return;
 912                         }
 913
 914                         # For ?curid=x urls, disallow indexing
 915                         if( $wgRequest->getInt('curid') )
 916                                 $wgOut->setRobotPolicy( 'noindex,follow' );
 917
 918                         # We're looking at an old revision
 919                         if( !empty( $oldid ) ) {
 920                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 921                                 if( is_null( $this->mRevision ) ) {
 922                                         // FIXME: This would be a nice place to load the 'no such page' text.
 923                                 } else {
 924                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 925                                         # Allow admins to see deleted content if explicitly requested
 926                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 927                                                 if( !$unhide || !$this->mRevision->userCan(Revision::DELETED_TEXT) ) {
 928                                                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", 'rev-deleted-text-permission' );
 929                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 930                                                         wfProfileOut( __METHOD__ );
 931                                                         return;
 932                                                 } else {
 933                                                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", 'rev-deleted-text-view' );
 934                                                         // and we are allowed to see...
 935                                                 }
 936                                         }
 937                                         // Is this the current revision and otherwise cacheable? Try the parser cache...
 938                                         if( $oldid === $this->getLatest() && $this->useParserCache( false )
 939                                                 && $wgOut->tryParserCache( $this, $wgUser ) )
 940                                         {
 941                                                 $outputDone = true;
 942                                         }
 943                                 }
 944                         }
 945
 946                         // Ensure that UI elements requiring revision ID have
 947                         // the correct version information.
 948                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 949
 950                         if( $outputDone ) {
 951                                 // do nothing...
 952                         // Pages containing custom CSS or JavaScript get special treatment
 953                         } else if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 954                                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
 955                                 // Give hooks a chance to customise the output
 956                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 957                                         // Wrap the whole lot in a <pre> and don't parse
 958                                         $m = array();
 959                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 960                                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 961                                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 962                                         $wgOut->addHTML( "\n</pre>\n" );
 963                                 }
 964                         } else if( $rt = Title::newFromRedirectArray( $text ) ) { # get an array of redirect targets
 965                                 # Don't append the subtitle if this was an old revision
 966                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 967                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 968                                 $wgOut->addParserOutputNoText( $parseout );
 969                         } else if( $pcache ) {
 970                                 # Display content and save to parser cache
 971                                 $this->outputWikiText( $text );
 972                         } else {
 973                                 # Display content, don't attempt to save to parser cache
 974                                 # Don't show section-edit links on old revisions... this way lies madness.
 975                                 if( !$this->isCurrent() ) {
 976                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 977                                 }
 978                                 # Display content and don't save to parser cache
 979                                 # With timing hack -- TS 2006-07-26
 980                                 $time = -wfTime();
 981                                 $this->outputWikiText( $text, false );
 982                                 $time += wfTime();
 983
 984                                 # Timing hack
 985                                 if( $time > 3 ) {
 986                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 987                                                 $this->mTitle->getPrefixedDBkey()));
 988                                 }
 989
 990                                 if( !$this->isCurrent() ) {
 991                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 992                                 }
 993                         }
 994                 }
 995                 /* title may have been set from the cache */
 996                 $t = $wgOut->getPageTitle();
 997                 if( empty( $t ) ) {
 998                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 999
1000                         # For the main page, overwrite the <title> element with the con-
1001                         # tents of 'pagetitle-view-mainpage' instead of the default (if
1002                         # that's not empty).
1003                         if( $this->mTitle->equals( Title::newMainPage() ) &&
1004                         wfMsgForContent( 'pagetitle-view-mainpage' ) !== '' ) {
1005                                 $wgOut->setHTMLTitle( wfMsgForContent( 'pagetitle-view-mainpage' ) );
1006                         }
1007                 }
1008
1009                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1010                 if( $ns == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1011                         $wgOut->addWikiMsg('anontalkpagetext');
1012                 }
1013
1014                 # If we have been passed an &rcid= parameter, we want to give the user a
1015                 # chance to mark this new article as patrolled.
1016                 if( !empty($rcid) && $this->mTitle->exists() && $this->mTitle->quickUserCan('patrol') ) {
1017                         $wgOut->addHTML(
1018                                 "<div class='patrollink'>" .
1019                                         wfMsgHtml( 'markaspatrolledlink',
1020                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
1021                                                 "action=markpatrolled&rcid=$rcid" )
1022                                         ) .
1023                                 '</div>'
1024                          );
1025                 }
1026
1027                 # Trackbacks
1028                 if( $wgUseTrackbacks ) {
1029                         $this->addTrackbacks();
1030                 }
1031
1032                 $this->viewUpdates();
1033                 wfProfileOut( __METHOD__ );
1034         }
1035
1036         protected function showDeletionLog() {
1037                 global $wgUser, $wgOut;
1038                 $loglist = new LogEventsList( $wgUser->getSkin(), $wgOut );
1039                 $pager = new LogPager( $loglist, 'delete', false, $this->mTitle->getPrefixedText() );
1040                 if( $pager->getNumRows() > 0 ) {
1041                         $pager->mLimit = 10;
1042                         $wgOut->addHTML( '<div class="mw-warning-with-logexcerpt">' );
1043                         $wgOut->addWikiMsg( 'deleted-notice' );
1044                         $wgOut->addHTML(
1045                                 $loglist->beginLogEventsList() .
1046                                 $pager->getBody() .
1047                                 $loglist->endLogEventsList()
1048                         );
1049                         if( $pager->getNumRows() > 10 ) {
1050                                 $wgOut->addHTML( $wgUser->getSkin()->link(
1051                                         SpecialPage::getTitleFor( 'Log' ),
1052                                         wfMsgHtml( 'deletelog-fulllog' ),
1053                                         array(),
1054                                         array( 'type' => 'delete', 'page' => $this->mTitle->getPrefixedText() )
1055                                 ) );
1056                         }
1057                         $wgOut->addHTML( '</div>' );
1058                 }
1059         }
1060
1061         /*
1062         * Should the parser cache be used?
1063         */
1064         protected function useParserCache( $oldid ) {
1065                 global $wgUser, $wgEnableParserCache;
1066
1067                 return $wgEnableParserCache
1068                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
1069                         && $this->exists()
1070                         && empty( $oldid )
1071                         && !$this->mTitle->isCssOrJsPage()
1072                         && !$this->mTitle->isCssJsSubpage();
1073         }
1074
1075         /**
1076          * View redirect
1077          * @param $target Title object or Array of destination(s) to redirect
1078          * @param $appendSubtitle Boolean [optional]
1079          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1080          */
1081         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1082                 global $wgParser, $wgOut, $wgContLang, $wgStylePath, $wgUser;
1083                 # Display redirect
1084                 if( !is_array( $target ) ) {
1085                         $target = array( $target );
1086                 }
1087                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
1088                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1089                 $imageUrl2 = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1090                 $alt2 = $wgContLang->isRTL() ? '&larr;' : '&rarr;'; // should -> and <- be used instead of entities?
1091
1092                 if( $appendSubtitle ) {
1093                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1094                 }
1095                 $sk = $wgUser->getSkin();
1096                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1097                 $title = array_shift( $target );
1098                 if( $forceKnown ) {
1099                         $link = $sk->makeKnownLinkObj( $title, htmlspecialchars( $title->getFullText() ) );
1100                 } else {
1101                         $link = $sk->makeLinkObj( $title, htmlspecialchars( $title->getFullText() ) );
1102                 }
1103                 // automatically append redirect=no to each link, since most of them are redirect pages themselves
1104                 foreach( $target as $rt ) {
1105                         if( $forceKnown ) {
1106                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1107                                         . $sk->makeKnownLinkObj( $rt, htmlspecialchars( $rt->getFullText() ) );
1108                         } else {
1109                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1110                                         . $sk->makeLinkObj( $rt, htmlspecialchars( $rt->getFullText() ) );
1111                         }
1112                 }
1113                 return '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
1114                         '<span class="redirectText">'.$link.'</span>';
1115
1116         }
1117
1118         public function addTrackbacks() {
1119                 global $wgOut, $wgUser;
1120                 $dbr = wfGetDB( DB_SLAVE );
1121                 $tbs = $dbr->select( 'trackbacks',
1122                         array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
1123                         array('tb_page' => $this->getID() )
1124                 );
1125                 if( !$dbr->numRows($tbs) ) return;
1126
1127                 $tbtext = "";
1128                 while( $o = $dbr->fetchObject($tbs) ) {
1129                         $rmvtxt = "";
1130                         if( $wgUser->isAllowed( 'trackback' ) ) {
1131                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid=" .
1132                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1133                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1134                         }
1135                         $tbtext .= "\n";
1136                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
1137                                         $o->tb_title,
1138                                         $o->tb_url,
1139                                         $o->tb_ex,
1140                                         $o->tb_name,
1141                                         $rmvtxt);
1142                 }
1143                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>$1</div>\n", array( 'trackbackbox', $tbtext ) );
1144                 $this->mTitle->invalidateCache();
1145         }
1146
1147         public function deletetrackback() {
1148                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
1149                 if( !$wgUser->matchEditToken($wgRequest->getVal('token')) ) {
1150                         $wgOut->addWikiMsg( 'sessionfailure' );
1151                         return;
1152                 }
1153
1154                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1155                 if( count($permission_errors) ) {
1156                         $wgOut->showPermissionsErrorPage( $permission_errors );
1157                         return;
1158                 }
1159
1160                 $db = wfGetDB( DB_MASTER );
1161                 $db->delete( 'trackbacks', array('tb_id' => $wgRequest->getInt('tbid')) );
1162
1163                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1164                 $this->mTitle->invalidateCache();
1165         }
1166
1167         public function render() {
1168                 global $wgOut;
1169                 $wgOut->setArticleBodyOnly(true);
1170                 $this->view();
1171         }
1172
1173         /**
1174          * Handle action=purge
1175          */
1176         public function purge() {
1177                 global $wgUser, $wgRequest, $wgOut;
1178                 if( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1179                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1180                                 $this->doPurge();
1181                                 $this->view();
1182                         }
1183                 } else {
1184                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1185                         $button = wfMsgExt( 'confirm_purge_button', array('escapenoentities') );
1186                         $form = "<form method=\"post\" action=\"$action\">\n" .
1187                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1188                                         "</form>\n";
1189                         $top = wfMsgExt( 'confirm-purge-top', array('parse') );
1190                         $bottom = wfMsgExt( 'confirm-purge-bottom', array('parse') );
1191                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1192                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1193                         $wgOut->addHTML( $top . $form . $bottom );
1194                 }
1195         }
1196
1197         /**
1198          * Perform the actions of a page purging
1199          */
1200         public function doPurge() {
1201                 global $wgUseSquid;
1202                 // Invalidate the cache
1203                 $this->mTitle->invalidateCache();
1204
1205                 if( $wgUseSquid ) {
1206                         // Commit the transaction before the purge is sent
1207                         $dbw = wfGetDB( DB_MASTER );
1208                         $dbw->immediateCommit();
1209
1210                         // Send purge
1211                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1212                         $update->doUpdate();
1213                 }
1214                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1215                         global $wgMessageCache;
1216                         if( $this->getID() == 0 ) {
1217                                 $text = false;
1218                         } else {
1219                                 $text = $this->getRawText();
1220                         }
1221                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1222                 }
1223         }
1224
1225         /**
1226          * Insert a new empty page record for this article.
1227          * This *must* be followed up by creating a revision
1228          * and running $this->updateToLatest( $rev_id );
1229          * or else the record will be left in a funky state.
1230          * Best if all done inside a transaction.
1231          *
1232          * @param $dbw Database
1233          * @return int The newly created page_id key, or false if the title already existed
1234          * @private
1235          */
1236         public function insertOn( $dbw ) {
1237                 wfProfileIn( __METHOD__ );
1238
1239                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1240                 $dbw->insert( 'page', array(
1241                         'page_id'           => $page_id,
1242                         'page_namespace'    => $this->mTitle->getNamespace(),
1243                         'page_title'        => $this->mTitle->getDBkey(),
1244                         'page_counter'      => 0,
1245                         'page_restrictions' => '',
1246                         'page_is_redirect'  => 0, # Will set this shortly...
1247                         'page_is_new'       => 1,
1248                         'page_random'       => wfRandom(),
1249                         'page_touched'      => $dbw->timestamp(),
1250                         'page_latest'       => 0, # Fill this in shortly...
1251                         'page_len'          => 0, # Fill this in shortly...
1252                 ), __METHOD__, 'IGNORE' );
1253
1254                 $affected = $dbw->affectedRows();
1255                 if( $affected ) {
1256                         $newid = $dbw->insertId();
1257                         $this->mTitle->resetArticleId( $newid );
1258                 }
1259                 wfProfileOut( __METHOD__ );
1260                 return $affected ? $newid : false;
1261         }
1262
1263         /**
1264          * Update the page record to point to a newly saved revision.
1265          *
1266          * @param $dbw Database object
1267          * @param $revision Revision: For ID number, and text used to set
1268                             length and redirect status fields
1269          * @param $lastRevision Integer: if given, will not overwrite the page field
1270          *                      when different from the currently set value.
1271          *                      Giving 0 indicates the new page flag should be set
1272          *                      on.
1273          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1274          *                                                       removing rows in redirect table.
1275          * @return bool true on success, false on failure
1276          * @private
1277          */
1278         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1279                 wfProfileIn( __METHOD__ );
1280
1281                 $text = $revision->getText();
1282                 $rt = Title::newFromRedirect( $text );
1283
1284                 $conditions = array( 'page_id' => $this->getId() );
1285                 if( !is_null( $lastRevision ) ) {
1286                         # An extra check against threads stepping on each other
1287                         $conditions['page_latest'] = $lastRevision;
1288                 }
1289
1290                 $dbw->update( 'page',
1291                         array( /* SET */
1292                                 'page_latest'      => $revision->getId(),
1293                                 'page_touched'     => $dbw->timestamp(),
1294                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1295                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1296                                 'page_len'         => strlen( $text ),
1297                         ),
1298                         $conditions,
1299                         __METHOD__ );
1300
1301                 $result = $dbw->affectedRows() != 0;
1302                 if( $result ) {
1303                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1304                 }
1305
1306                 wfProfileOut( __METHOD__ );
1307                 return $result;
1308         }
1309
1310         /**
1311          * Add row to the redirect table if this is a redirect, remove otherwise.
1312          *
1313          * @param $dbw Database
1314          * @param $redirectTitle a title object pointing to the redirect target,
1315          *                                               or NULL if this is not a redirect
1316          * @param $lastRevIsRedirect If given, will optimize adding and
1317          *                                                       removing rows in redirect table.
1318          * @return bool true on success, false on failure
1319          * @private
1320          */
1321         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1322                 // Always update redirects (target link might have changed)
1323                 // Update/Insert if we don't know if the last revision was a redirect or not
1324                 // Delete if changing from redirect to non-redirect
1325                 $isRedirect = !is_null($redirectTitle);
1326                 if($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1327                         wfProfileIn( __METHOD__ );
1328                         if( $isRedirect ) {
1329                                 // This title is a redirect, Add/Update row in the redirect table
1330                                 $set = array( /* SET */
1331                                         'rd_namespace' => $redirectTitle->getNamespace(),
1332                                         'rd_title'     => $redirectTitle->getDBkey(),
1333                                         'rd_from'      => $this->getId(),
1334                                 );
1335                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1336                         } else {
1337                                 // This is not a redirect, remove row from redirect table
1338                                 $where = array( 'rd_from' => $this->getId() );
1339                                 $dbw->delete( 'redirect', $where, __METHOD__);
1340                         }
1341                         if( $this->getTitle()->getNamespace() == NS_FILE ) {
1342                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1343                         }
1344                         wfProfileOut( __METHOD__ );
1345                         return ( $dbw->affectedRows() != 0 );
1346                 }
1347                 return true;
1348         }
1349
1350         /**
1351          * If the given revision is newer than the currently set page_latest,
1352          * update the page record. Otherwise, do nothing.
1353          *
1354          * @param $dbw Database object
1355          * @param $revision Revision object
1356          */
1357         public function updateIfNewerOn( &$dbw, $revision ) {
1358                 wfProfileIn( __METHOD__ );
1359                 $row = $dbw->selectRow(
1360                         array( 'revision', 'page' ),
1361                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1362                         array(
1363                                 'page_id' => $this->getId(),
1364                                 'page_latest=rev_id' ),
1365                         __METHOD__ );
1366                 if( $row ) {
1367                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1368                                 wfProfileOut( __METHOD__ );
1369                                 return false;
1370                         }
1371                         $prev = $row->rev_id;
1372                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1373                 } else {
1374                         # No or missing previous revision; mark the page as new
1375                         $prev = 0;
1376                         $lastRevIsRedirect = null;
1377                 }
1378                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1379                 wfProfileOut( __METHOD__ );
1380                 return $ret;
1381         }
1382
1383         /**
1384          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1385          * @return string Complete article text, or null if error
1386          */
1387         public function replaceSection( $section, $text, $summary = '', $edittime = NULL ) {
1388                 wfProfileIn( __METHOD__ );
1389                 if( strval( $section ) == '' ) {
1390                         // Whole-page edit; let the whole text through
1391                 } else {
1392                         if( is_null($edittime) ) {
1393                                 $rev = Revision::newFromTitle( $this->mTitle );
1394                         } else {
1395                                 $dbw = wfGetDB( DB_MASTER );
1396                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1397                         }
1398                         if( !$rev ) {
1399                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1400                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1401                                 return null;
1402                         }
1403                         $oldtext = $rev->getText();
1404
1405                         if( $section == 'new' ) {
1406                                 # Inserting a new section
1407                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1408                                 $text = strlen( trim( $oldtext ) ) > 0
1409                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1410                                                 : "{$subject}{$text}";
1411                         } else {
1412                                 # Replacing an existing section; roll out the big guns
1413                                 global $wgParser;
1414                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1415                         }
1416                 }
1417                 wfProfileOut( __METHOD__ );
1418                 return $text;
1419         }
1420
1421         /**
1422          * @deprecated use Article::doEdit()
1423          */
1424         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1425                 wfDeprecated( __METHOD__ );
1426                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1427                         ( $isminor ? EDIT_MINOR : 0 ) |
1428                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1429                         ( $bot ? EDIT_FORCE_BOT : 0 );
1430
1431                 # If this is a comment, add the summary as headline
1432                 if( $comment && $summary != "" ) {
1433                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1434                 }
1435
1436                 $this->doEdit( $text, $summary, $flags );
1437
1438                 $dbw = wfGetDB( DB_MASTER );
1439                 if($watchthis) {
1440                         if(!$this->mTitle->userIsWatching()) {
1441                                 $dbw->begin();
1442                                 $this->doWatch();
1443                                 $dbw->commit();
1444                         }
1445                 } else {
1446                         if( $this->mTitle->userIsWatching() ) {
1447                                 $dbw->begin();
1448                                 $this->doUnwatch();
1449                                 $dbw->commit();
1450                         }
1451                 }
1452                 $this->doRedirect( $this->isRedirect( $text ) );
1453         }
1454
1455         /**
1456          * @deprecated use Article::doEdit()
1457          */
1458         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1459                 wfDeprecated( __METHOD__ );
1460                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1461                         ( $minor ? EDIT_MINOR : 0 ) |
1462                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1463
1464                 $status = $this->doEdit( $text, $summary, $flags );
1465                 if( !$status->isOK() ) {
1466                         return false;
1467                 }
1468
1469                 $dbw = wfGetDB( DB_MASTER );
1470                 if( $watchthis ) {
1471                         if(!$this->mTitle->userIsWatching()) {
1472                                 $dbw->begin();
1473                                 $this->doWatch();
1474                                 $dbw->commit();
1475                         }
1476                 } else {
1477                         if( $this->mTitle->userIsWatching() ) {
1478                                 $dbw->begin();
1479                                 $this->doUnwatch();
1480                                 $dbw->commit();
1481                         }
1482                 }
1483
1484                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1485                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1486
1487                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1488                 return true;
1489         }
1490
1491         /**
1492          * Article::doEdit()
1493          *
1494          * Change an existing article or create a new article. Updates RC and all necessary caches,
1495          * optionally via the deferred update array.
1496          *
1497          * $wgUser must be set before calling this function.
1498          *
1499          * @param $text String: new text
1500          * @param $summary String: edit summary
1501          * @param $flags Integer bitfield:
1502          *      EDIT_NEW
1503          *          Article is known or assumed to be non-existent, create a new one
1504          *      EDIT_UPDATE
1505          *          Article is known or assumed to be pre-existing, update it
1506          *      EDIT_MINOR
1507          *          Mark this edit minor, if the user is allowed to do so
1508          *      EDIT_SUPPRESS_RC
1509          *          Do not log the change in recentchanges
1510          *      EDIT_FORCE_BOT
1511          *          Mark the edit a "bot" edit regardless of user rights
1512          *      EDIT_DEFER_UPDATES
1513          *          Defer some of the updates until the end of index.php
1514          *      EDIT_AUTOSUMMARY
1515          *          Fill in blank summaries with generated text where possible
1516          *
1517          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1518          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1519          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1520          * edit-already-exists error will be returned. These two conditions are also possible with
1521          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1522          *
1523          * @param $baseRevId the revision ID this edit was based off, if any
1524          * @param $user Optional user object, $wgUser will be used if not passed
1525          *
1526          * @return Status object. Possible errors:
1527          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1528          *     edit-gone-missing:       In update mode, but the article didn't exist
1529          *     edit-conflict:           In update mode, the article changed unexpectedly
1530          *     edit-no-change:          Warning that the text was the same as before
1531          *     edit-already-exists:     In creation mode, but the article already exists
1532          *
1533          *  Extensions may define additional errors.
1534          *
1535          *  $return->value will contain an associative array with members as follows:
1536          *     new:                     Boolean indicating if the function attempted to create a new article
1537          *     revision:                The revision object for the inserted revision, or null
1538          *
1539          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1540          */
1541         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1542                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1543
1544                 # Low-level sanity check
1545                 if( $this->mTitle->getText() == '' ) {
1546                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1547                 }
1548
1549                 wfProfileIn( __METHOD__ );
1550
1551                 $user = is_null($user) ? $wgUser : $user;
1552                 $status = Status::newGood( array() );
1553
1554                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1555                 $this->loadPageData();
1556
1557                 if( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1558                         $aid = $this->mTitle->getArticleID();
1559                         if( $aid ) {
1560                                 $flags |= EDIT_UPDATE;
1561                         } else {
1562                                 $flags |= EDIT_NEW;
1563                         }
1564                 }
1565
1566                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1567                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1568                 {
1569                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1570                         wfProfileOut( __METHOD__ );
1571                         if( $status->isOK() ) {
1572                                 $status->fatal( 'edit-hook-aborted');
1573                         }
1574                         return $status;
1575                 }
1576
1577                 # Silently ignore EDIT_MINOR if not allowed
1578                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed('minoredit');
1579                 $bot = $flags & EDIT_FORCE_BOT;
1580
1581                 $oldtext = $this->getRawText(); // current revision
1582                 $oldsize = strlen( $oldtext );
1583
1584                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1585                 if( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1586                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1587                 }
1588
1589                 $editInfo = $this->prepareTextForEdit( $text );
1590                 $text = $editInfo->pst;
1591                 $newsize = strlen( $text );
1592
1593                 $dbw = wfGetDB( DB_MASTER );
1594                 $now = wfTimestampNow();
1595
1596                 if( $flags & EDIT_UPDATE ) {
1597                         # Update article, but only if changed.
1598                         $status->value['new'] = false;
1599                         # Make sure the revision is either completely inserted or not inserted at all
1600                         if( !$wgDBtransactions ) {
1601                                 $userAbort = ignore_user_abort( true );
1602                         }
1603
1604                         $revisionId = 0;
1605
1606                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1607
1608                         if( $changed ) {
1609                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1610                                   - (int)$this->isCountable( $oldtext );
1611                                 $this->mTotalAdjustment = 0;
1612
1613                                 if( !$this->mLatest ) {
1614                                         # Article gone missing
1615                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1616                                         $status->fatal( 'edit-gone-missing' );
1617                                         wfProfileOut( __METHOD__ );
1618                                         return $status;
1619                                 }
1620
1621                                 $revision = new Revision( array(
1622                                         'page'       => $this->getId(),
1623                                         'comment'    => $summary,
1624                                         'minor_edit' => $isminor,
1625                                         'text'       => $text,
1626                                         'parent_id'  => $this->mLatest,
1627                                         'user'       => $user->getId(),
1628                                         'user_text'  => $user->getName(),
1629                                         ) );
1630
1631                                 $dbw->begin();
1632                                 $revisionId = $revision->insertOn( $dbw );
1633
1634                                 # Update page
1635                                 #
1636                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1637                                 # during the course of this function. This makes sure that EditPage can detect
1638                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1639                                 # before this function is called. A previous function used a separate query, this
1640                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1641                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1642
1643                                 if( !$ok ) {
1644                                         /* Belated edit conflict! Run away!! */
1645                                         $status->fatal( 'edit-conflict' );
1646                                         # Delete the invalid revision if the DB is not transactional
1647                                         if( !$wgDBtransactions ) {
1648                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1649                                         }
1650                                         $revisionId = 0;
1651                                         $dbw->rollback();
1652                                 } else {
1653                                         global $wgUseRCPatrol;
1654                                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, $baseRevId, $user) );
1655                                         # Update recentchanges
1656                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1657                                                 # Mark as patrolled if the user can do so
1658                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan('autopatrol');
1659                                                 # Add RC row to the DB
1660                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1661                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1662                                                         $revisionId, $patrolled
1663                                                 );
1664                                                 # Log auto-patrolled edits
1665                                                 if( $patrolled ) {
1666                                                         PatrolLog::record( $rc, true );
1667                                                 }
1668                                         }
1669                                         $user->incEditCount();
1670                                         $dbw->commit();
1671                                 }
1672                         } else {
1673                                 $status->warning( 'edit-no-change' );
1674                                 $revision = null;
1675                                 // Keep the same revision ID, but do some updates on it
1676                                 $revisionId = $this->getRevIdFetched();
1677                                 // Update page_touched, this is usually implicit in the page update
1678                                 // Other cache updates are done in onArticleEdit()
1679                                 $this->mTitle->invalidateCache();
1680                         }
1681
1682                         if( !$wgDBtransactions ) {
1683                                 ignore_user_abort( $userAbort );
1684                         }
1685                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1686                         if( !$status->isOK() ) {
1687                                 wfProfileOut( __METHOD__ );
1688                                 return $status;
1689                         }
1690
1691                         # Invalidate cache of this article and all pages using this article
1692                         # as a template. Partly deferred.
1693                         Article::onArticleEdit( $this->mTitle );
1694                         # Update links tables, site stats, etc.
1695                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1696                 } else {
1697                         # Create new article
1698                         $status->value['new'] = true;
1699
1700                         # Set statistics members
1701                         # We work out if it's countable after PST to avoid counter drift
1702                         # when articles are created with {{subst:}}
1703                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1704                         $this->mTotalAdjustment = 1;
1705
1706                         $dbw->begin();
1707
1708                         # Add the page record; stake our claim on this title!
1709                         # This will return false if the article already exists
1710                         $newid = $this->insertOn( $dbw );
1711
1712                         if( $newid === false ) {
1713                                 $dbw->rollback();
1714                                 $status->fatal( 'edit-already-exists' );
1715                                 wfProfileOut( __METHOD__ );
1716                                 return $status;
1717                         }
1718
1719                         # Save the revision text...
1720                         $revision = new Revision( array(
1721                                 'page'       => $newid,
1722                                 'comment'    => $summary,
1723                                 'minor_edit' => $isminor,
1724                                 'text'       => $text,
1725                                 'user'       => $user->getId(),
1726                                 'user_text'  => $user->getName(),
1727                                 ) );
1728                         $revisionId = $revision->insertOn( $dbw );
1729
1730                         $this->mTitle->resetArticleID( $newid );
1731
1732                         # Update the page record with revision data
1733                         $this->updateRevisionOn( $dbw, $revision, 0 );
1734
1735                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $user) );
1736                         # Update recentchanges
1737                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1738                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1739                                 # Mark as patrolled if the user can do so
1740                                 $patrolled = ($wgUseRCPatrol || $wgUseNPPatrol) && $this->mTitle->userCan('autopatrol');
1741                                 # Add RC row to the DB
1742                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1743                                         '', strlen($text), $revisionId, $patrolled );
1744                                 # Log auto-patrolled edits
1745                                 if( $patrolled ) {
1746                                         PatrolLog::record( $rc, true );
1747                                 }
1748                         }
1749                         $user->incEditCount();
1750                         $dbw->commit();
1751
1752                         # Update links, etc.
1753                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1754
1755                         # Clear caches
1756                         Article::onArticleCreate( $this->mTitle );
1757
1758                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1759                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1760                 }
1761
1762                 # Do updates right now unless deferral was requested
1763                 if( !( $flags & EDIT_DEFER_UPDATES ) ) {
1764                         wfDoUpdates();
1765                 }
1766
1767                 // Return the new revision (or null) to the caller
1768                 $status->value['revision'] = $revision;
1769
1770                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1771                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status ) );
1772
1773                 wfProfileOut( __METHOD__ );
1774                 return $status;
1775         }
1776
1777         /**
1778          * @deprecated wrapper for doRedirect
1779          */
1780         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1781                 wfDeprecated( __METHOD__ );
1782                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1783         }
1784
1785         /**
1786          * Output a redirect back to the article.
1787          * This is typically used after an edit.
1788          *
1789          * @param $noRedir Boolean: add redirect=no
1790          * @param $sectionAnchor String: section to redirect to, including "#"
1791          * @param $extraQuery String: extra query params
1792          */
1793         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1794                 global $wgOut;
1795                 if( $noRedir ) {
1796                         $query = 'redirect=no';
1797                         if( $extraQuery )
1798                                 $query .= "&$query";
1799                 } else {
1800                         $query = $extraQuery;
1801                 }
1802                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1803         }
1804
1805         /**
1806          * Mark this particular edit/page as patrolled
1807          */
1808         public function markpatrolled() {
1809                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
1810                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1811
1812                 # If we haven't been given an rc_id value, we can't do anything
1813                 $rcid = (int) $wgRequest->getVal('rcid');
1814                 $rc = RecentChange::newFromId($rcid);
1815                 if( is_null($rc) ) {
1816                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1817                         return;
1818                 }
1819
1820                 #It would be nice to see where the user had actually come from, but for now just guess
1821                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
1822                 $return = SpecialPage::getTitleFor( $returnto );
1823
1824                 $dbw = wfGetDB( DB_MASTER );
1825                 $errors = $rc->doMarkPatrolled();
1826
1827                 if( in_array(array('rcpatroldisabled'), $errors) ) {
1828                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1829                         return;
1830                 }
1831
1832                 if( in_array(array('hookaborted'), $errors) ) {
1833                         // The hook itself has handled any output
1834                         return;
1835                 }
1836
1837                 if( in_array(array('markedaspatrollederror-noautopatrol'), $errors) ) {
1838                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1839                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
1840                         $wgOut->returnToMain( false, $return );
1841                         return;
1842                 }
1843
1844                 if( !empty($errors) ) {
1845                         $wgOut->showPermissionsErrorPage( $errors );
1846                         return;
1847                 }
1848
1849                 # Inform the user
1850                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1851                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
1852                 $wgOut->returnToMain( false, $return );
1853         }
1854
1855         /**
1856          * User-interface handler for the "watch" action
1857          */
1858
1859         public function watch() {
1860                 global $wgUser, $wgOut;
1861                 if( $wgUser->isAnon() ) {
1862                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1863                         return;
1864                 }
1865                 if( wfReadOnly() ) {
1866                         $wgOut->readOnlyPage();
1867                         return;
1868                 }
1869                 if( $this->doWatch() ) {
1870                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1871                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1872                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
1873                 }
1874                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1875         }
1876
1877         /**
1878          * Add this page to $wgUser's watchlist
1879          * @return bool true on successful watch operation
1880          */
1881         public function doWatch() {
1882                 global $wgUser;
1883                 if( $wgUser->isAnon() ) {
1884                         return false;
1885                 }
1886                 if( wfRunHooks('WatchArticle', array(&$wgUser, &$this)) ) {
1887                         $wgUser->addWatch( $this->mTitle );
1888                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1889                 }
1890                 return false;
1891         }
1892
1893         /**
1894          * User interface handler for the "unwatch" action.
1895          */
1896         public function unwatch() {
1897                 global $wgUser, $wgOut;
1898                 if( $wgUser->isAnon() ) {
1899                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1900                         return;
1901                 }
1902                 if( wfReadOnly() ) {
1903                         $wgOut->readOnlyPage();
1904                         return;
1905                 }
1906                 if( $this->doUnwatch() ) {
1907                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1908                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1909                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
1910                 }
1911                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1912         }
1913
1914         /**
1915          * Stop watching a page
1916          * @return bool true on successful unwatch
1917          */
1918         public function doUnwatch() {
1919                 global $wgUser;
1920                 if( $wgUser->isAnon() ) {
1921                         return false;
1922                 }
1923                 if( wfRunHooks('UnwatchArticle', array(&$wgUser, &$this)) ) {
1924                         $wgUser->removeWatch( $this->mTitle );
1925                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1926                 }
1927                 return false;
1928         }
1929
1930         /**
1931          * action=protect handler
1932          */
1933         public function protect() {
1934                 $form = new ProtectionForm( $this );
1935                 $form->execute();
1936         }
1937
1938         /**
1939          * action=unprotect handler (alias)
1940          */
1941         public function unprotect() {
1942                 $this->protect();
1943         }
1944
1945         /**
1946          * Update the article's restriction field, and leave a log entry.
1947          *
1948          * @param $limit Array: set of restriction keys
1949          * @param $reason String
1950          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1951          * @param $expiry Array: per restriction type expiration
1952          * @return bool true on success
1953          */
1954         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
1955                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1956
1957                 $id = $this->mTitle->getArticleID();
1958                 if ( $id <= 0 ) {
1959                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
1960                         return false;
1961                 }
1962
1963                 if ( wfReadOnly() ) {
1964                         wfDebug( "updateRestrictions failed: read-only\n" );
1965                         return false;
1966                 }
1967
1968                 if ( !$this->mTitle->userCan( 'protect' ) ) {
1969                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
1970                         return false;
1971                 }
1972
1973                 if( !$cascade ) {
1974                         $cascade = false;
1975                 }
1976
1977                 // Take this opportunity to purge out expired restrictions
1978                 Title::purgeExpiredRestrictions();
1979
1980                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1981                 # we expect a single selection, but the schema allows otherwise.
1982                 $current = array();
1983                 $updated = Article::flattenRestrictions( $limit );
1984                 $changed = false;
1985                 foreach( $wgRestrictionTypes as $action ) {
1986                         if( isset( $expiry[$action] ) ) {
1987                                 # Get current restrictions on $action
1988                                 $aLimits = $this->mTitle->getRestrictions( $action );
1989                                 $current[$action] = implode( '', $aLimits );
1990                                 # Are any actual restrictions being dealt with here?
1991                                 $aRChanged = count($aLimits) || !empty($limit[$action]);
1992                                 # If something changed, we need to log it. Checking $aRChanged
1993                                 # assures that "unprotecting" a page that is not protected does
1994                                 # not log just because the expiry was "changed".
1995                                 if( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
1996                                         $changed = true;
1997                                 }
1998                         }
1999                 }
2000
2001                 $current = Article::flattenRestrictions( $current );
2002
2003                 $changed = ($changed || $current != $updated );
2004                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
2005                 $protect = ( $updated != '' );
2006
2007                 # If nothing's changed, do nothing
2008                 if( $changed ) {
2009                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2010
2011                                 $dbw = wfGetDB( DB_MASTER );
2012
2013                                 # Prepare a null revision to be added to the history
2014                                 $modified = $current != '' && $protect;
2015                                 if( $protect ) {
2016                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2017                                 } else {
2018                                         $comment_type = 'unprotectedarticle';
2019                                 }
2020                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2021
2022                                 # Only restrictions with the 'protect' right can cascade...
2023                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2024                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2025                                 # The schema allows multiple restrictions
2026                                 if(!in_array('protect', $editrestriction) && !in_array('sysop', $editrestriction))
2027                                         $cascade = false;
2028                                 $cascade_description = '';
2029                                 if( $cascade ) {
2030                                         $cascade_description = ' ['.wfMsgForContent('protect-summary-cascade').']';
2031                                 }
2032
2033                                 if( $reason )
2034                                         $comment .= ": $reason";
2035
2036                                 $editComment = $comment;
2037                                 $encodedExpiry = array();
2038                                 $protect_description = '';
2039                                 foreach( $limit as $action => $restrictions  ) {
2040                                         if ( !isset($expiry[$action]) )
2041                                                 $expiry[$action] = 'infinite';
2042
2043                                         $encodedExpiry[$action] = Block::encodeExpiry($expiry[$action], $dbw );
2044                                         if( $restrictions != '' ) {
2045                                                 $protect_description .= "[$action=$restrictions] (";
2046                                                 if( $encodedExpiry[$action] != 'infinity' ) {
2047                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2048                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2049                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2050                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2051                                                 } else {
2052                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2053                                                 }
2054                                                 $protect_description .= ') ';
2055                                         }
2056                                 }
2057                                 $protect_description = trim($protect_description);
2058
2059                                 if( $protect_description && $protect )
2060                                         $editComment .= " ($protect_description)";
2061                                 if( $cascade )
2062                                         $editComment .= "$cascade_description";
2063                                 # Update restrictions table
2064                                 foreach( $limit as $action => $restrictions ) {
2065                                         if($restrictions != '' ) {
2066                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
2067                                                         array( 'pr_page' => $id,
2068                                                                 'pr_type' => $action,
2069                                                                 'pr_level' => $restrictions,
2070                                                                 'pr_cascade' => ($cascade && $action == 'edit') ? 1 : 0,
2071                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
2072                                         } else {
2073                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2074                                                         'pr_type' => $action ), __METHOD__ );
2075                                         }
2076                                 }
2077
2078                                 # Insert a null revision
2079                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2080                                 $nullRevId = $nullRevision->insertOn( $dbw );
2081
2082                                 $latest = $this->getLatest();
2083                                 # Update page record
2084                                 $dbw->update( 'page',
2085                                         array( /* SET */
2086                                                 'page_touched' => $dbw->timestamp(),
2087                                                 'page_restrictions' => '',
2088                                                 'page_latest' => $nullRevId
2089                                         ), array( /* WHERE */
2090                                                 'page_id' => $id
2091                                         ), 'Article::protect'
2092                                 );
2093
2094                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $nullRevision, $latest, $wgUser) );
2095                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2096
2097                                 # Update the protection log
2098                                 $log = new LogPage( 'protect' );
2099                                 if( $protect ) {
2100                                         $params = array($protect_description,$cascade ? 'cascade' : '');
2101                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason), $params );
2102                                 } else {
2103                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2104                                 }
2105
2106                         } # End hook
2107                 } # End "changed" check
2108
2109                 return true;
2110         }
2111
2112         /**
2113          * Take an array of page restrictions and flatten it to a string
2114          * suitable for insertion into the page_restrictions field.
2115          * @param $limit Array
2116          * @return String
2117          */
2118         protected static function flattenRestrictions( $limit ) {
2119                 if( !is_array( $limit ) ) {
2120                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2121                 }
2122                 $bits = array();
2123                 ksort( $limit );
2124                 foreach( $limit as $action => $restrictions ) {
2125                         if( $restrictions != '' ) {
2126                                 $bits[] = "$action=$restrictions";
2127                         }
2128                 }
2129                 return implode( ':', $bits );
2130         }
2131
2132         /**
2133          * Auto-generates a deletion reason
2134          * @param &$hasHistory Boolean: whether the page has a history
2135          */
2136         public function generateReason( &$hasHistory ) {
2137                 global $wgContLang;
2138                 $dbw = wfGetDB( DB_MASTER );
2139                 // Get the last revision
2140                 $rev = Revision::newFromTitle( $this->mTitle );
2141                 if( is_null( $rev ) )
2142                         return false;
2143
2144                 // Get the article's contents
2145                 $contents = $rev->getText();
2146                 $blank = false;
2147                 // If the page is blank, use the text from the previous revision,
2148                 // which can only be blank if there's a move/import/protect dummy revision involved
2149                 if( $contents == '' ) {
2150                         $prev = $rev->getPrevious();
2151                         if( $prev )     {
2152                                 $contents = $prev->getText();
2153                                 $blank = true;
2154                         }
2155                 }
2156
2157                 // Find out if there was only one contributor
2158                 // Only scan the last 20 revisions
2159                 $limit = 20;
2160                 $res = $dbw->select( 'revision', 'rev_user_text',
2161                         array( 'rev_page' => $this->getID() ), __METHOD__,
2162                         array( 'LIMIT' => $limit )
2163                 );
2164                 if( $res === false )
2165                         // This page has no revisions, which is very weird
2166                         return false;
2167                 if( $res->numRows() > 1 )
2168                                 $hasHistory = true;
2169                 else
2170                                 $hasHistory = false;
2171                 $row = $dbw->fetchObject( $res );
2172                 $onlyAuthor = $row->rev_user_text;
2173                 // Try to find a second contributor
2174                 foreach( $res as $row ) {
2175                         if( $row->rev_user_text != $onlyAuthor ) {
2176                                 $onlyAuthor = false;
2177                                 break;
2178                         }
2179                 }
2180                 $dbw->freeResult( $res );
2181
2182                 // Generate the summary with a '$1' placeholder
2183                 if( $blank ) {
2184                         // The current revision is blank and the one before is also
2185                         // blank. It's just not our lucky day
2186                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2187                 } else {
2188                         if( $onlyAuthor )
2189                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2190                         else
2191                                 $reason = wfMsgForContent( 'excontent', '$1' );
2192                 }
2193
2194                 if( $reason == '-' ) {
2195                         // Allow these UI messages to be blanked out cleanly
2196                         return '';
2197                 }
2198
2199                 // Replace newlines with spaces to prevent uglyness
2200                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2201                 // Calculate the maximum amount of chars to get
2202                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2203                 $maxLength = 255 - (strlen( $reason ) - 2) - 3;
2204                 $contents = $wgContLang->truncate( $contents, $maxLength );
2205                 // Remove possible unfinished links
2206                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2207                 // Now replace the '$1' placeholder
2208                 $reason = str_replace( '$1', $contents, $reason );
2209                 return $reason;
2210         }
2211
2212
2213         /*
2214          * UI entry point for page deletion
2215          */
2216         public function delete() {
2217                 global $wgUser, $wgOut, $wgRequest;
2218
2219                 $confirm = $wgRequest->wasPosted() &&
2220                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2221
2222                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2223                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2224
2225                 $reason = $this->DeleteReasonList;
2226
2227                 if( $reason != 'other' && $this->DeleteReason != '' ) {
2228                         // Entry from drop down menu + additional comment
2229                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2230                 } elseif( $reason == 'other' ) {
2231                         $reason = $this->DeleteReason;
2232                 }
2233                 # Flag to hide all contents of the archived revisions
2234                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2235
2236                 # This code desperately needs to be totally rewritten
2237
2238                 # Read-only check...
2239                 if( wfReadOnly() ) {
2240                         $wgOut->readOnlyPage();
2241                         return;
2242                 }
2243
2244                 # Check permissions
2245                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2246
2247                 if( count( $permission_errors ) > 0 ) {
2248                         $wgOut->showPermissionsErrorPage( $permission_errors );
2249                         return;
2250                 }
2251
2252                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2253
2254                 # Better double-check that it hasn't been deleted yet!
2255                 $dbw = wfGetDB( DB_MASTER );
2256                 $conds = $this->mTitle->pageCond();
2257                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2258                 if( $latest === false ) {
2259                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2260                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2261                         LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2262                         return;
2263                 }
2264
2265                 # Hack for big sites
2266                 $bigHistory = $this->isBigDeletion();
2267                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2268                         global $wgLang, $wgDeleteRevisionsLimit;
2269                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2270                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2271                         return;
2272                 }
2273
2274                 if( $confirm ) {
2275                         $this->doDelete( $reason, $suppress );
2276                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2277                                 $this->doWatch();
2278                         } elseif( $this->mTitle->userIsWatching() ) {
2279                                 $this->doUnwatch();
2280                         }
2281                         return;
2282                 }
2283
2284                 // Generate deletion reason
2285                 $hasHistory = false;
2286                 if( !$reason ) $reason = $this->generateReason($hasHistory);
2287
2288                 // If the page has a history, insert a warning
2289                 if( $hasHistory && !$confirm ) {
2290                         $skin = $wgUser->getSkin();
2291                         $wgOut->addHTML( '<strong>' . wfMsgExt( 'historywarning', array( 'parseinline' ) ) . ' ' . $skin->historyLink() . '</strong>' );
2292                         if( $bigHistory ) {
2293                                 global $wgLang, $wgDeleteRevisionsLimit;
2294                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2295                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2296                         }
2297                 }
2298
2299                 return $this->confirmDelete( $reason );
2300         }
2301
2302         /**
2303          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2304          */
2305         public function isBigDeletion() {
2306                 global $wgDeleteRevisionsLimit;
2307                 if( $wgDeleteRevisionsLimit ) {
2308                         $revCount = $this->estimateRevisionCount();
2309                         return $revCount > $wgDeleteRevisionsLimit;
2310                 }
2311                 return false;
2312         }
2313
2314         /**
2315          * @return int approximate revision count
2316          */
2317         public function estimateRevisionCount() {
2318                 $dbr = wfGetDB( DB_SLAVE );
2319                 // For an exact count...
2320                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2321                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2322                 return $dbr->estimateRowCount( 'revision', '*',
2323                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2324         }
2325
2326         /**
2327          * Get the last N authors
2328          * @param $num Integer: number of revisions to get
2329          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2330          * @return array Array of authors, duplicates not removed
2331          */
2332         public function getLastNAuthors( $num, $revLatest = 0 ) {
2333                 wfProfileIn( __METHOD__ );
2334                 // First try the slave
2335                 // If that doesn't have the latest revision, try the master
2336                 $continue = 2;
2337                 $db = wfGetDB( DB_SLAVE );
2338                 do {
2339                         $res = $db->select( array( 'page', 'revision' ),
2340                                 array( 'rev_id', 'rev_user_text' ),
2341                                 array(
2342                                         'page_namespace' => $this->mTitle->getNamespace(),
2343                                         'page_title' => $this->mTitle->getDBkey(),
2344                                         'rev_page = page_id'
2345                                 ), __METHOD__, $this->getSelectOptions( array(
2346                                         'ORDER BY' => 'rev_timestamp DESC',
2347                                         'LIMIT' => $num
2348                                 ) )
2349                         );
2350                         if( !$res ) {
2351                                 wfProfileOut( __METHOD__ );
2352                                 return array();
2353                         }
2354                         $row = $db->fetchObject( $res );
2355                         if( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2356                                 $db = wfGetDB( DB_MASTER );
2357                                 $continue--;
2358                         } else {
2359                                 $continue = 0;
2360                         }
2361                 } while ( $continue );
2362
2363                 $authors = array( $row->rev_user_text );
2364                 while ( $row = $db->fetchObject( $res ) ) {
2365                         $authors[] = $row->rev_user_text;
2366                 }
2367                 wfProfileOut( __METHOD__ );
2368                 return $authors;
2369         }
2370
2371         /**
2372          * Output deletion confirmation dialog
2373          * @param $reason String: prefilled reason
2374          */
2375         public function confirmDelete( $reason ) {
2376                 global $wgOut, $wgUser;
2377
2378                 wfDebug( "Article::confirmDelete\n" );
2379
2380                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $wgUser->getSkin()->makeKnownLinkObj( $this->mTitle ) ) );
2381                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2382                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2383
2384                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
2385                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2386                                         <td></td>
2387                                         <td class='mw-input'>" .
2388                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2389                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2390                                         "</td>
2391                                 </tr>";
2392                 } else {
2393                         $suppress = '';
2394                 }
2395                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2396
2397                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2398                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2399                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2400                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2401                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2402                         "<tr id=\"wpDeleteReasonListRow\">
2403                                 <td class='mw-label'>" .
2404                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2405                                 "</td>
2406                                 <td class='mw-input'>" .
2407                                         Xml::listDropDown( 'wpDeleteReasonList',
2408                                                 wfMsgForContent( 'deletereason-dropdown' ),
2409                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2410                                 "</td>
2411                         </tr>
2412                         <tr id=\"wpDeleteReasonRow\">
2413                                 <td class='mw-label'>" .
2414                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2415                                 "</td>
2416                                 <td class='mw-input'>" .
2417                                         Xml::input( 'wpReason', 60, $reason, array( 'type' => 'text', 'maxlength' => '255',
2418                                                 'tabindex' => '2', 'id' => 'wpReason' ) ) .
2419                                 "</td>
2420                         </tr>
2421                         <tr>
2422                                 <td></td>
2423                                 <td class='mw-input'>" .
2424                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2425                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2426                                 "</td>
2427                         </tr>
2428                         $suppress
2429                         <tr>
2430                                 <td></td>
2431                                 <td class='mw-submit'>" .
2432                                         Xml::submitButton( wfMsg( 'deletepage' ),
2433                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2434                                 "</td>
2435                         </tr>" .
2436                         Xml::closeElement( 'table' ) .
2437                         Xml::closeElement( 'fieldset' ) .
2438                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2439                         Xml::closeElement( 'form' );
2440
2441                         if( $wgUser->isAllowed( 'editinterface' ) ) {
2442                                 $skin = $wgUser->getSkin();
2443                                 $link = $skin->makeLink ( 'MediaWiki:Deletereason-dropdown', wfMsgHtml( 'delete-edit-reasonlist' ) );
2444                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2445                         }
2446
2447                 $wgOut->addHTML( $form );
2448                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2449         }
2450
2451         /**
2452          * Perform a deletion and output success or failure messages
2453          */
2454         public function doDelete( $reason, $suppress = false ) {
2455                 global $wgOut, $wgUser;
2456                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2457
2458                 $error = '';
2459                 if( wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason, &$error)) ) {
2460                         if( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2461                                 $deleted = $this->mTitle->getPrefixedText();
2462
2463                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2464                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2465
2466                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2467
2468                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2469                                 $wgOut->returnToMain( false );
2470                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason, $id));
2471                         } else {
2472                                 if( $error == '' ) {
2473                                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2474                                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2475                                         LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2476                                 } else {
2477                                         $wgOut->showFatalError( $error );
2478                                 }
2479                         }
2480                 }
2481         }
2482
2483         /**
2484          * Back-end article deletion
2485          * Deletes the article with database consistency, writes logs, purges caches
2486          * Returns success
2487          */
2488         public function doDeleteArticle( $reason, $suppress = false, $id = 0 ) {
2489                 global $wgUseSquid, $wgDeferredUpdateList;
2490                 global $wgUseTrackbacks;
2491
2492                 wfDebug( __METHOD__."\n" );
2493
2494                 $dbw = wfGetDB( DB_MASTER );
2495                 $ns = $this->mTitle->getNamespace();
2496                 $t = $this->mTitle->getDBkey();
2497                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2498
2499                 if( $t == '' || $id == 0 ) {
2500                         return false;
2501                 }
2502
2503                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getRawText() ), -1 );
2504                 array_push( $wgDeferredUpdateList, $u );
2505
2506                 // Bitfields to further suppress the content
2507                 if( $suppress ) {
2508                         $bitfield = 0;
2509                         // This should be 15...
2510                         $bitfield |= Revision::DELETED_TEXT;
2511                         $bitfield |= Revision::DELETED_COMMENT;
2512                         $bitfield |= Revision::DELETED_USER;
2513                         $bitfield |= Revision::DELETED_RESTRICTED;
2514                 } else {
2515                         $bitfield = 'rev_deleted';
2516                 }
2517
2518                 $dbw->begin();
2519                 // For now, shunt the revision data into the archive table.
2520                 // Text is *not* removed from the text table; bulk storage
2521                 // is left intact to avoid breaking block-compression or
2522                 // immutable storage schemes.
2523                 //
2524                 // For backwards compatibility, note that some older archive
2525                 // table entries will have ar_text and ar_flags fields still.
2526                 //
2527                 // In the future, we may keep revisions and mark them with
2528                 // the rev_deleted field, which is reserved for this purpose.
2529                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2530                         array(
2531                                 'ar_namespace'  => 'page_namespace',
2532                                 'ar_title'      => 'page_title',
2533                                 'ar_comment'    => 'rev_comment',
2534                                 'ar_user'       => 'rev_user',
2535                                 'ar_user_text'  => 'rev_user_text',
2536                                 'ar_timestamp'  => 'rev_timestamp',
2537                                 'ar_minor_edit' => 'rev_minor_edit',
2538                                 'ar_rev_id'     => 'rev_id',
2539                                 'ar_text_id'    => 'rev_text_id',
2540                                 'ar_text'       => '\'\'', // Be explicit to appease
2541                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2542                                 'ar_len'        => 'rev_len',
2543                                 'ar_page_id'    => 'page_id',
2544                                 'ar_deleted'    => $bitfield
2545                         ), array(
2546                                 'page_id' => $id,
2547                                 'page_id = rev_page'
2548                         ), __METHOD__
2549                 );
2550
2551                 # Delete restrictions for it
2552                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2553
2554                 # Now that it's safely backed up, delete it
2555                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2556                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2557                 if( !$ok ) {
2558                         $dbw->rollback();
2559                         return false;
2560                 }
2561
2562                 # Fix category table counts
2563                 $cats = array();
2564                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2565                 foreach( $res as $row ) {
2566                         $cats []= $row->cl_to;
2567                 }
2568                 $this->updateCategoryCounts( array(), $cats );
2569
2570                 # If using cascading deletes, we can skip some explicit deletes
2571                 if( !$dbw->cascadingDeletes() ) {
2572                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2573
2574                         if($wgUseTrackbacks)
2575                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2576
2577                         # Delete outgoing links
2578                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2579                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2580                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2581                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2582                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2583                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2584                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2585                 }
2586
2587                 # If using cleanup triggers, we can skip some manual deletes
2588                 if( !$dbw->cleanupTriggers() ) {
2589                         # Clean up recentchanges entries...
2590                         $dbw->delete( 'recentchanges',
2591                                 array( 'rc_type != '.RC_LOG,
2592                                         'rc_namespace' => $this->mTitle->getNamespace(),
2593                                         'rc_title' => $this->mTitle->getDBKey() ),
2594                                 __METHOD__ );
2595                         $dbw->delete( 'recentchanges',
2596                                 array( 'rc_type != '.RC_LOG, 'rc_cur_id' => $id ),
2597                                 __METHOD__ );
2598                 }
2599
2600                 # Clear caches
2601                 Article::onArticleDelete( $this->mTitle );
2602
2603                 # Clear the cached article id so the interface doesn't act like we exist
2604                 $this->mTitle->resetArticleID( 0 );
2605
2606                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2607                 $logtype = $suppress ? 'suppress' : 'delete';
2608                 $log = new LogPage( $logtype );
2609
2610                 # Make sure logging got through
2611                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2612
2613                 $dbw->commit();
2614
2615                 return true;
2616         }
2617
2618         /**
2619          * Roll back the most recent consecutive set of edits to a page
2620          * from the same user; fails if there are no eligible edits to
2621          * roll back to, e.g. user is the sole contributor. This function
2622          * performs permissions checks on $wgUser, then calls commitRollback()
2623          * to do the dirty work
2624          *
2625          * @param $fromP String: Name of the user whose edits to rollback.
2626          * @param $summary String: Custom summary. Set to default summary if empty.
2627          * @param $token String: Rollback token.
2628          * @param $bot Boolean: If true, mark all reverted edits as bot.
2629          *
2630          * @param $resultDetails Array: contains result-specific array of additional values
2631          *    'alreadyrolled' : 'current' (rev)
2632          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2633          *
2634          * @return array of errors, each error formatted as
2635          *   array(messagekey, param1, param2, ...).
2636          * On success, the array is empty.  This array can also be passed to
2637          * OutputPage::showPermissionsErrorPage().
2638          */
2639         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2640                 global $wgUser;
2641                 $resultDetails = null;
2642
2643                 # Check permissions
2644                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
2645                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
2646                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2647
2648                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2649                         $errors[] = array( 'sessionfailure' );
2650
2651                 if( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
2652                         $errors[] = array( 'actionthrottledtext' );
2653                 }
2654                 # If there were errors, bail out now
2655                 if( !empty( $errors ) )
2656                         return $errors;
2657
2658                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
2659         }
2660
2661         /**
2662          * Backend implementation of doRollback(), please refer there for parameter
2663          * and return value documentation
2664          *
2665          * NOTE: This function does NOT check ANY permissions, it just commits the
2666          * rollback to the DB Therefore, you should only call this function direct-
2667          * ly if you want to use custom permissions checks. If you don't, use
2668          * doRollback() instead.
2669          */
2670         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
2671                 global $wgUseRCPatrol, $wgUser, $wgLang;
2672                 $dbw = wfGetDB( DB_MASTER );
2673
2674                 if( wfReadOnly() ) {
2675                         return array( array( 'readonlytext' ) );
2676                 }
2677
2678                 # Get the last editor
2679                 $current = Revision::newFromTitle( $this->mTitle );
2680                 if( is_null( $current ) ) {
2681                         # Something wrong... no page?
2682                         return array(array('notanarticle'));
2683                 }
2684
2685                 $from = str_replace( '_', ' ', $fromP );
2686                 if( $from != $current->getUserText() ) {
2687                         $resultDetails = array( 'current' => $current );
2688                         return array(array('alreadyrolled',
2689                                 htmlspecialchars($this->mTitle->getPrefixedText()),
2690                                 htmlspecialchars($fromP),
2691                                 htmlspecialchars($current->getUserText())
2692                         ));
2693                 }
2694
2695                 # Get the last edit not by this guy
2696                 $user = intval( $current->getUser() );
2697                 $user_text = $dbw->addQuotes( $current->getUserText() );
2698                 $s = $dbw->selectRow( 'revision',
2699                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2700                         array(  'rev_page' => $current->getPage(),
2701                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2702                         ), __METHOD__,
2703                         array(  'USE INDEX' => 'page_timestamp',
2704                                 'ORDER BY'  => 'rev_timestamp DESC' )
2705                         );
2706                 if( $s === false ) {
2707                         # No one else ever edited this page
2708                         return array(array('cantrollback'));
2709                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
2710                         # Only admins can see this text
2711                         return array(array('notvisiblerev'));
2712                 }
2713
2714                 $set = array();
2715                 if( $bot && $wgUser->isAllowed('markbotedits') ) {
2716                         # Mark all reverted edits as bot
2717                         $set['rc_bot'] = 1;
2718                 }
2719                 if( $wgUseRCPatrol ) {
2720                         # Mark all reverted edits as patrolled
2721                         $set['rc_patrolled'] = 1;
2722                 }
2723
2724                 if( $set ) {
2725                         $dbw->update( 'recentchanges', $set,
2726                                         array( /* WHERE */
2727                                                 'rc_cur_id' => $current->getPage(),
2728                                                 'rc_user_text' => $current->getUserText(),
2729                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2730                                         ), __METHOD__
2731                                 );
2732                 }
2733
2734                 # Generate the edit summary if necessary
2735                 $target = Revision::newFromId( $s->rev_id );
2736                 if( empty( $summary ) ){
2737                         $summary = wfMsgForContent( 'revertpage' );
2738                 }
2739
2740                 # Allow the custom summary to use the same args as the default message
2741                 $args = array(
2742                         $target->getUserText(), $from, $s->rev_id,
2743                         $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
2744                         $current->getId(), $wgLang->timeanddate($current->getTimestamp())
2745                 );
2746                 $summary = wfMsgReplaceArgs( $summary, $args );
2747
2748                 # Save
2749                 $flags = EDIT_UPDATE;
2750
2751                 if( $wgUser->isAllowed('minoredit') )
2752                         $flags |= EDIT_MINOR;
2753
2754                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
2755                         $flags |= EDIT_FORCE_BOT;
2756                 # Actually store the edit
2757                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
2758                 if( !empty( $status->value['revision'] ) ) {
2759                         $revId = $status->value['revision']->getId();
2760                 } else {
2761                         $revId = false;
2762                 }
2763
2764                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
2765
2766                 $resultDetails = array(
2767                         'summary' => $summary,
2768                         'current' => $current,
2769                         'target' => $target,
2770                         'newid' => $revId
2771                 );
2772                 return array();
2773         }
2774
2775         /**
2776          * User interface for rollback operations
2777          */
2778         public function rollback() {
2779                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2780                 $details = null;
2781
2782                 $result = $this->doRollback(
2783                         $wgRequest->getVal( 'from' ),
2784                         $wgRequest->getText( 'summary' ),
2785                         $wgRequest->getVal( 'token' ),
2786                         $wgRequest->getBool( 'bot' ),
2787                         $details
2788                 );
2789
2790                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
2791                         $wgOut->rateLimited();
2792                         return;
2793                 }
2794                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
2795                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2796                         $errArray = $result[0];
2797                         $errMsg = array_shift( $errArray );
2798                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
2799                         if( isset( $details['current'] ) ){
2800                                 $current = $details['current'];
2801                                 if( $current->getComment() != '' ) {
2802                                         $wgOut->addWikiMsgArray( 'editcomment', array(
2803                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
2804                                 }
2805                         }
2806                         return;
2807                 }
2808                 # Display permissions errors before read-only message -- there's no
2809                 # point in misleading the user into thinking the inability to rollback
2810                 # is only temporary.
2811                 if( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
2812                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
2813                         # move any 'readonlytext' error manually.
2814                         $out = array();
2815                         foreach( $result as $error ) {
2816                                 if( $error != array( 'readonlytext' ) ) {
2817                                         $out []= $error;
2818                                 }
2819                         }
2820                         $wgOut->showPermissionsErrorPage( $out );
2821                         return;
2822                 }
2823                 if( $result == array( array( 'readonlytext' ) ) ) {
2824                         $wgOut->readOnlyPage();
2825                         return;
2826                 }
2827
2828                 $current = $details['current'];
2829                 $target = $details['target'];
2830                 $newId = $details['newid'];
2831                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2832                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2833                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2834                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2835                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2836                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2837                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2838                 $wgOut->returnToMain( false, $this->mTitle );
2839
2840                 if( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
2841                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
2842                         $de->showDiff( '', '' );
2843                 }
2844         }
2845
2846
2847         /**
2848          * Do standard deferred updates after page view
2849          */
2850         public function viewUpdates() {
2851                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
2852                 # Don't update page view counters on views from bot users (bug 14044)
2853                 if( !$wgDisableCounters && !$wgUser->isAllowed('bot') && $this->getID() ) {
2854                         Article::incViewCount( $this->getID() );
2855                         $u = new SiteStatsUpdate( 1, 0, 0 );
2856                         array_push( $wgDeferredUpdateList, $u );
2857                 }
2858                 # Update newtalk / watchlist notification status
2859                 $wgUser->clearNotification( $this->mTitle );
2860         }
2861
2862         /**
2863          * Prepare text which is about to be saved.
2864          * Returns a stdclass with source, pst and output members
2865          */
2866         public function prepareTextForEdit( $text, $revid=null ) {
2867                 if( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
2868                         // Already prepared
2869                         return $this->mPreparedEdit;
2870                 }
2871                 global $wgParser;
2872                 $edit = (object)array();
2873                 $edit->revid = $revid;
2874                 $edit->newText = $text;
2875                 $edit->pst = $this->preSaveTransform( $text );
2876                 $options = new ParserOptions;
2877                 $options->setTidy( true );
2878                 $options->enableLimitReport();
2879                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
2880                 $edit->oldText = $this->getContent();
2881                 $this->mPreparedEdit = $edit;
2882                 return $edit;
2883         }
2884
2885         /**
2886          * Do standard deferred updates after page edit.
2887          * Update links tables, site stats, search index and message cache.
2888          * Purges pages that include this page if the text was changed here.
2889          * Every 100th edit, prune the recent changes table.
2890          *
2891          * @private
2892          * @param $text New text of the article
2893          * @param $summary Edit summary
2894          * @param $minoredit Minor edit
2895          * @param $timestamp_of_pagechange Timestamp associated with the page change
2896          * @param $newid rev_id value of the new revision
2897          * @param $changed Whether or not the content actually changed
2898          */
2899         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2900                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
2901
2902                 wfProfileIn( __METHOD__ );
2903
2904                 # Parse the text
2905                 # Be careful not to double-PST: $text is usually already PST-ed once
2906                 if( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2907                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2908                         $editInfo = $this->prepareTextForEdit( $text, $newid );
2909                 } else {
2910                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2911                         $editInfo = $this->mPreparedEdit;
2912                 }
2913
2914                 # Save it to the parser cache
2915                 if( $wgEnableParserCache ) {
2916                         $parserCache = ParserCache::singleton();
2917                         $parserCache->save( $editInfo->output, $this, $wgUser );
2918                 }
2919
2920                 # Update the links tables
2921                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
2922                 $u->doUpdate();
2923
2924                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
2925
2926                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2927                         if( 0 == mt_rand( 0, 99 ) ) {
2928                                 // Flush old entries from the `recentchanges` table; we do this on
2929                                 // random requests so as to avoid an increase in writes for no good reason
2930                                 global $wgRCMaxAge;
2931                                 $dbw = wfGetDB( DB_MASTER );
2932                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2933                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2934                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2935                                 $dbw->query( $sql );
2936                         }
2937                 }
2938
2939                 $id = $this->getID();
2940                 $title = $this->mTitle->getPrefixedDBkey();
2941                 $shortTitle = $this->mTitle->getDBkey();
2942
2943                 if( 0 == $id ) {
2944                         wfProfileOut( __METHOD__ );
2945                         return;
2946                 }
2947
2948                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2949                 array_push( $wgDeferredUpdateList, $u );
2950                 $u = new SearchUpdate( $id, $title, $text );
2951                 array_push( $wgDeferredUpdateList, $u );
2952
2953                 # If this is another user's talk page, update newtalk
2954                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2955                 # load of user talk pages and piss people off, nor if it's a minor edit
2956                 # by a properly-flagged bot.
2957                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2958                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
2959                         if( wfRunHooks('ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2960                                 $other = User::newFromName( $shortTitle, false );
2961                                 if( !$other ) {
2962                                         wfDebug( __METHOD__.": invalid username\n" );
2963                                 } elseif( User::isIP( $shortTitle ) ) {
2964                                         // An anonymous user
2965                                         $other->setNewtalk( true );
2966                                 } elseif( $other->isLoggedIn() ) {
2967                                         $other->setNewtalk( true );
2968                                 } else {
2969                                         wfDebug( __METHOD__. ": don't need to notify a nonexistent user\n" );
2970                                 }
2971                         }
2972                 }
2973
2974                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2975                         $wgMessageCache->replace( $shortTitle, $text );
2976                 }
2977
2978                 wfProfileOut( __METHOD__ );
2979         }
2980
2981         /**
2982          * Perform article updates on a special page creation.
2983          *
2984          * @param $rev Revision object
2985          *
2986          * @todo This is a shitty interface function. Kill it and replace the
2987          * other shitty functions like editUpdates and such so it's not needed
2988          * anymore.
2989          */
2990         public function createUpdates( $rev ) {
2991                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2992                 $this->mTotalAdjustment = 1;
2993                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2994                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2995         }
2996
2997         /**
2998          * Generate the navigation links when browsing through an article revisions
2999          * It shows the information as:
3000          *   Revision as of \<date\>; view current revision
3001          *   \<- Previous version | Next Version -\>
3002          *
3003          * @param $oldid String: revision ID of this article revision
3004          */
3005         public function setOldSubtitle( $oldid = 0 ) {
3006                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3007
3008                 if( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3009                         return;
3010                 }
3011
3012                 $revision = Revision::newFromId( $oldid );
3013
3014                 $current = ( $oldid == $this->mLatest );
3015                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3016                 $sk = $wgUser->getSkin();
3017                 $lnk = $current
3018                         ? wfMsgHtml( 'currentrevisionlink' )
3019                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'currentrevisionlink' ) );
3020                 $curdiff = $current
3021                         ? wfMsgHtml( 'diff' )
3022                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=cur&oldid='.$oldid );
3023                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3024                 $prevlink = $prev
3025                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
3026                         : wfMsgHtml( 'previousrevision' );
3027                 $prevdiff = $prev
3028                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=prev&oldid='.$oldid )
3029                         : wfMsgHtml( 'diff' );
3030                 $nextlink = $current
3031                         ? wfMsgHtml( 'nextrevision' )
3032                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'nextrevision' ), 'direction=next&oldid='.$oldid );
3033                 $nextdiff = $current
3034                         ? wfMsgHtml( 'diff' )
3035                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=next&oldid='.$oldid );
3036
3037                 $cdel='';
3038                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
3039                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
3040                         if( $revision->isCurrent() ) {
3041                         // We don't handle top deleted edits too well
3042                                 $cdel = wfMsgHtml( 'rev-delundel' );
3043                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3044                         // If revision was hidden from sysops
3045                                 $cdel = wfMsgHtml( 'rev-delundel' );
3046                         } else {
3047                                 $cdel = $sk->makeKnownLinkObj( $revdel,
3048                                         wfMsgHtml('rev-delundel'),
3049                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
3050                                         '&oldid=' . urlencode( $oldid ) );
3051                                 // Bolden oversighted content
3052                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
3053                                         $cdel = "<strong>$cdel</strong>";
3054                         }
3055                         $cdel = "(<small>$cdel</small>) ";
3056                 }
3057                 $unhide = $wgRequest->getInt('unhide') == 1 && $wgUser->matchEditToken( $wgRequest->getVal('token'), $oldid );
3058                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3059                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3060
3061                 $m = wfMsg( 'revision-info-current' );
3062                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3063                         ? 'revision-info-current'
3064                         : 'revision-info';
3065
3066                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsgExt( $infomsg, array( 'parseinline', 'replaceafter' ),
3067                         $td, $userlinks, $revision->getID() ) . "</div>\n" .
3068
3069                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3070                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3071                 $wgOut->setSubtitle( $r );
3072         }
3073
3074         /**
3075          * This function is called right before saving the wikitext,
3076          * so we can do things like signatures and links-in-context.
3077          *
3078          * @param $text String
3079          */
3080         public function preSaveTransform( $text ) {
3081                 global $wgParser, $wgUser;
3082                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3083         }
3084
3085         /* Caching functions */
3086
3087         /**
3088          * checkLastModified returns true if it has taken care of all
3089          * output to the client that is necessary for this request.
3090          * (that is, it has sent a cached version of the page)
3091          */
3092         protected function tryFileCache() {
3093                 static $called = false;
3094                 if( $called ) {
3095                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3096                         return false;
3097                 }
3098                 $called = true;
3099                 if( $this->isFileCacheable() ) {
3100                         $cache = new HTMLFileCache( $this->mTitle );
3101                         if( $cache->isFileCacheGood( $this->mTouched ) ) {
3102                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3103                                 $cache->loadFromFileCache();
3104                                 return true;
3105                         } else {
3106                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3107                                 ob_start( array(&$cache, 'saveToFileCache' ) );
3108                         }
3109                 } else {
3110                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3111                 }
3112                 return false;
3113         }
3114
3115         /**
3116          * Check if the page can be cached
3117          * @return bool
3118          */
3119         public function isFileCacheable() {
3120                 $cacheable = false;
3121                 if( HTMLFileCache::useFileCache() ) {
3122                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3123                         // Extension may have reason to disable file caching on some pages.
3124                         if( $cacheable ) {
3125                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3126                         }
3127                 }
3128                 return $cacheable;
3129         }
3130
3131         /**
3132          * Loads page_touched and returns a value indicating if it should be used
3133          *
3134          */
3135         public function checkTouched() {
3136                 if( !$this->mDataLoaded ) {
3137                         $this->loadPageData();
3138                 }
3139                 return !$this->mIsRedirect;
3140         }
3141
3142         /**
3143          * Get the page_touched field
3144          */
3145         public function getTouched() {
3146                 # Ensure that page data has been loaded
3147                 if( !$this->mDataLoaded ) {
3148                         $this->loadPageData();
3149                 }
3150                 return $this->mTouched;
3151         }
3152
3153         /**
3154          * Get the page_latest field
3155          */
3156         public function getLatest() {
3157                 if( !$this->mDataLoaded ) {
3158                         $this->loadPageData();
3159                 }
3160                 return (int)$this->mLatest;
3161         }
3162
3163         /**
3164          * Edit an article without doing all that other stuff
3165          * The article must already exist; link tables etc
3166          * are not updated, caches are not flushed.
3167          *
3168          * @param $text String: text submitted
3169          * @param $comment String: comment submitted
3170          * @param $minor Boolean: whereas it's a minor modification
3171          */
3172         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3173                 wfProfileIn( __METHOD__ );
3174
3175                 $dbw = wfGetDB( DB_MASTER );
3176                 $revision = new Revision( array(
3177                         'page'       => $this->getId(),
3178                         'text'       => $text,
3179                         'comment'    => $comment,
3180                         'minor_edit' => $minor ? 1 : 0,
3181                         ) );
3182                 $revision->insertOn( $dbw );
3183                 $this->updateRevisionOn( $dbw, $revision );
3184
3185                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $wgUser) );
3186
3187                 wfProfileOut( __METHOD__ );
3188         }
3189
3190         /**
3191          * Used to increment the view counter
3192          *
3193          * @param $id Integer: article id
3194          */
3195         public static function incViewCount( $id ) {
3196                 $id = intval( $id );
3197                 global $wgHitcounterUpdateFreq, $wgDBtype;
3198
3199                 $dbw = wfGetDB( DB_MASTER );
3200                 $pageTable = $dbw->tableName( 'page' );
3201                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3202                 $acchitsTable = $dbw->tableName( 'acchits' );
3203
3204                 if( $wgHitcounterUpdateFreq <= 1 ) {
3205                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3206                         return;
3207                 }
3208
3209                 # Not important enough to warrant an error page in case of failure
3210                 $oldignore = $dbw->ignoreErrors( true );
3211
3212                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3213
3214                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
3215                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
3216                         # Most of the time (or on SQL errors), skip row count check
3217                         $dbw->ignoreErrors( $oldignore );
3218                         return;
3219                 }
3220
3221                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
3222                 $row = $dbw->fetchObject( $res );
3223                 $rown = intval( $row->n );
3224                 if( $rown >= $wgHitcounterUpdateFreq ){
3225                         wfProfileIn( 'Article::incViewCount-collect' );
3226                         $old_user_abort = ignore_user_abort( true );
3227
3228                         if($wgDBtype == 'mysql')
3229                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
3230                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
3231                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
3232                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
3233                                 'GROUP BY hc_id');
3234                         $dbw->query("DELETE FROM $hitcounterTable");
3235                         if($wgDBtype == 'mysql') {
3236                                 $dbw->query('UNLOCK TABLES');
3237                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3238                                         'WHERE page_id = hc_id');
3239                         }
3240                         else {
3241                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3242                                         "FROM $acchitsTable WHERE page_id = hc_id");
3243                         }
3244                         $dbw->query("DROP TABLE $acchitsTable");
3245
3246                         ignore_user_abort( $old_user_abort );
3247                         wfProfileOut( 'Article::incViewCount-collect' );
3248                 }
3249                 $dbw->ignoreErrors( $oldignore );
3250         }
3251
3252         /**#@+
3253          * The onArticle*() functions are supposed to be a kind of hooks
3254          * which should be called whenever any of the specified actions
3255          * are done.
3256          *
3257          * This is a good place to put code to clear caches, for instance.
3258          *
3259          * This is called on page move and undelete, as well as edit
3260          *
3261          * @param $title a title object
3262          */
3263
3264         public static function onArticleCreate( $title ) {
3265                 # Update existence markers on article/talk tabs...
3266                 if( $title->isTalkPage() ) {
3267                         $other = $title->getSubjectPage();
3268                 } else {
3269                         $other = $title->getTalkPage();
3270                 }
3271                 $other->invalidateCache();
3272                 $other->purgeSquid();
3273
3274                 $title->touchLinks();
3275                 $title->purgeSquid();
3276                 $title->deleteTitleProtection();
3277         }
3278
3279         public static function onArticleDelete( $title ) {
3280                 global $wgMessageCache;
3281                 # Update existence markers on article/talk tabs...
3282                 if( $title->isTalkPage() ) {
3283                         $other = $title->getSubjectPage();
3284                 } else {
3285                         $other = $title->getTalkPage();
3286                 }
3287                 $other->invalidateCache();
3288                 $other->purgeSquid();
3289
3290                 $title->touchLinks();
3291                 $title->purgeSquid();
3292
3293                 # File cache
3294                 HTMLFileCache::clearFileCache( $title );
3295
3296                 # Messages
3297                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
3298                         $wgMessageCache->replace( $title->getDBkey(), false );
3299                 }
3300                 # Images
3301                 if( $title->getNamespace() == NS_FILE ) {
3302                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3303                         $update->doUpdate();
3304                 }
3305                 # User talk pages
3306                 if( $title->getNamespace() == NS_USER_TALK ) {
3307                         $user = User::newFromName( $title->getText(), false );
3308                         $user->setNewtalk( false );
3309                 }
3310         }
3311
3312         /**
3313          * Purge caches on page update etc
3314          */
3315         public static function onArticleEdit( $title, $flags = '' ) {
3316                 global $wgDeferredUpdateList;
3317
3318                 // Invalidate caches of articles which include this page
3319                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3320
3321                 // Invalidate the caches of all pages which redirect here
3322                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3323
3324                 # Purge squid for this page only
3325                 $title->purgeSquid();
3326
3327                 # Clear file cache for this page only
3328                 HTMLFileCache::clearFileCache( $title );
3329         }
3330
3331         /**#@-*/
3332
3333         /**
3334          * Overriden by ImagePage class, only present here to avoid a fatal error
3335          * Called for ?action=revert
3336          */
3337         public function revert() {
3338                 global $wgOut;
3339                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3340         }
3341
3342         /**
3343          * Info about this page
3344          * Called for ?action=info when $wgAllowPageInfo is on.
3345          */
3346         public function info() {
3347                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3348
3349                 if( !$wgAllowPageInfo ) {
3350                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3351                         return;
3352                 }
3353
3354                 $page = $this->mTitle->getSubjectPage();
3355
3356                 $wgOut->setPagetitle( $page->getPrefixedText() );
3357                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3358                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3359
3360                 if( !$this->mTitle->exists() ) {
3361                         $wgOut->addHTML( '<div class="noarticletext">' );
3362                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3363                                 // This doesn't quite make sense; the user is asking for
3364                                 // information about the _page_, not the message... -- RC
3365                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3366                         } else {
3367                                 $msg = $wgUser->isLoggedIn()
3368                                         ? 'noarticletext'
3369                                         : 'noarticletextanon';
3370                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3371                         }
3372                         $wgOut->addHTML( '</div>' );
3373                 } else {
3374                         $dbr = wfGetDB( DB_SLAVE );
3375                         $wl_clause = array(
3376                                 'wl_title'     => $page->getDBkey(),
3377                                 'wl_namespace' => $page->getNamespace() );
3378                         $numwatchers = $dbr->selectField(
3379                                 'watchlist',
3380                                 'COUNT(*)',
3381                                 $wl_clause,
3382                                 __METHOD__,
3383                                 $this->getSelectOptions() );
3384
3385                         $pageInfo = $this->pageCountInfo( $page );
3386                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3387
3388                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3389                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3390                         if( $talkInfo ) {
3391                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3392                         }
3393                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3394                         if( $talkInfo ) {
3395                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3396                         }
3397                         $wgOut->addHTML( '</ul>' );
3398                 }
3399         }
3400
3401         /**
3402          * Return the total number of edits and number of unique editors
3403          * on a given page. If page does not exist, returns false.
3404          *
3405          * @param $title Title object
3406          * @return array
3407          */
3408         protected function pageCountInfo( $title ) {
3409                 $id = $title->getArticleId();
3410                 if( $id == 0 ) {
3411                         return false;
3412                 }
3413                 $dbr = wfGetDB( DB_SLAVE );
3414                 $rev_clause = array( 'rev_page' => $id );
3415                 $edits = $dbr->selectField(
3416                         'revision',
3417                         'COUNT(rev_page)',
3418                         $rev_clause,
3419                         __METHOD__,
3420                         $this->getSelectOptions()
3421                 );
3422                 $authors = $dbr->selectField(
3423                         'revision',
3424                         'COUNT(DISTINCT rev_user_text)',
3425                         $rev_clause,
3426                         __METHOD__,
3427                         $this->getSelectOptions()
3428                 );
3429                 return array( 'edits' => $edits, 'authors' => $authors );
3430         }
3431
3432         /**
3433          * Return a list of templates used by this article.
3434          * Uses the templatelinks table
3435          *
3436          * @return Array of Title objects
3437          */
3438         public function getUsedTemplates() {
3439                 $result = array();
3440                 $id = $this->mTitle->getArticleID();
3441                 if( $id == 0 ) {
3442                         return array();
3443                 }
3444                 $dbr = wfGetDB( DB_SLAVE );
3445                 $res = $dbr->select( array( 'templatelinks' ),
3446                         array( 'tl_namespace', 'tl_title' ),
3447                         array( 'tl_from' => $id ),
3448                         __METHOD__ );
3449                 if( $res !== false ) {
3450                         foreach( $res as $row ) {
3451                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3452                         }
3453                 }
3454                 $dbr->freeResult( $res );
3455                 return $result;
3456         }
3457
3458         /**
3459          * Returns a list of hidden categories this page is a member of.
3460          * Uses the page_props and categorylinks tables.
3461          *
3462          * @return Array of Title objects
3463          */
3464         public function getHiddenCategories() {
3465                 $result = array();
3466                 $id = $this->mTitle->getArticleID();
3467                 if( $id == 0 ) {
3468                         return array();
3469                 }
3470                 $dbr = wfGetDB( DB_SLAVE );
3471                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3472                         array( 'cl_to' ),
3473                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3474                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3475                         __METHOD__ );
3476                 if( $res !== false ) {
3477                         foreach( $res as $row ) {
3478                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3479                         }
3480                 }
3481                 $dbr->freeResult( $res );
3482                 return $result;
3483         }
3484
3485         /**
3486         * Return an applicable autosummary if one exists for the given edit.
3487         * @param $oldtext String: the previous text of the page.
3488         * @param $newtext String: The submitted text of the page.
3489         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
3490         * @return string An appropriate autosummary, or an empty string.
3491         */
3492         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3493                 # Decide what kind of autosummary is needed.
3494
3495                 # Redirect autosummaries
3496                 $ot = Title::newFromRedirect( $oldtext );
3497                 $rt = Title::newFromRedirect( $newtext );
3498                 if( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
3499                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3500                 }
3501
3502                 # New page autosummaries
3503                 if( $flags & EDIT_NEW && strlen( $newtext ) ) {
3504                         # If they're making a new article, give its text, truncated, in the summary.
3505                         global $wgContLang;
3506                         $truncatedtext = $wgContLang->truncate(
3507                                 str_replace("\n", ' ', $newtext),
3508                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
3509                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3510                 }
3511
3512                 # Blanking autosummaries
3513                 if( $oldtext != '' && $newtext == '' ) {
3514                         return wfMsgForContent( 'autosumm-blank' );
3515                 } elseif( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500) {
3516                         # Removing more than 90% of the article
3517                         global $wgContLang;
3518                         $truncatedtext = $wgContLang->truncate(
3519                                 $newtext,
3520                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
3521                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3522                 }
3523
3524                 # If we reach this point, there's no applicable autosummary for our case, so our
3525                 # autosummary is empty.
3526                 return '';
3527         }
3528
3529         /**
3530          * Add the primary page-view wikitext to the output buffer
3531          * Saves the text into the parser cache if possible.
3532          * Updates templatelinks if it is out of date.
3533          *
3534          * @param $text String
3535          * @param $cache Boolean
3536          */
3537         public function outputWikiText( $text, $cache = true ) {
3538                 global $wgParser, $wgUser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
3539
3540                 $popts = $wgOut->parserOptions();
3541                 $popts->setTidy(true);
3542                 $popts->enableLimitReport();
3543                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3544                         $popts, true, true, $this->getRevIdFetched() );
3545                 $popts->setTidy(false);
3546                 $popts->enableLimitReport( false );
3547                 if( $wgEnableParserCache && $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3548                         $parserCache = ParserCache::singleton();
3549                         $parserCache->save( $parserOutput, $this, $wgUser );
3550                 }
3551                 // Make sure file cache is not used on uncacheable content.
3552                 // Output that has magic words in it can still use the parser cache
3553                 // (if enabled), though it will generally expire sooner.
3554                 if( $parserOutput->getCacheTime() == -1 || $parserOutput->containsOldMagic() ) {
3555                         $wgUseFileCache = false;
3556                 }
3557
3558                 if( $this->isCurrent() && !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3559                         // templatelinks table may have become out of sync,
3560                         // especially if using variable-based transclusions.
3561                         // For paranoia, check if things have changed and if
3562                         // so apply updates to the database. This will ensure
3563                         // that cascaded protections apply as soon as the changes
3564                         // are visible.
3565
3566                         # Get templates from templatelinks
3567                         $id = $this->mTitle->getArticleID();
3568
3569                         $tlTemplates = array();
3570
3571                         $dbr = wfGetDB( DB_SLAVE );
3572                         $res = $dbr->select( array( 'templatelinks' ),
3573                                 array( 'tl_namespace', 'tl_title' ),
3574                                 array( 'tl_from' => $id ),
3575                                 __METHOD__ );
3576
3577                         global $wgContLang;
3578                         foreach( $res as $row ) {
3579                                 $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
3580                         }
3581
3582                         # Get templates from parser output.
3583                         $poTemplates = array();
3584                         foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3585                                 foreach ( $templates as $dbk => $id ) {
3586                                         $key = $row->tl_namespace . ':'. $row->tl_title;
3587                                         $poTemplates["$ns:$dbk"] = true;
3588                                 }
3589                         }
3590
3591                         # Get the diff
3592                         # Note that we simulate array_diff_key in PHP <5.0.x
3593                         $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
3594
3595                         if( count( $templates_diff ) > 0 ) {
3596                                 # Whee, link updates time.
3597                                 $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3598                                 $u->doUpdate();
3599                         }
3600                 }
3601
3602                 $wgOut->addParserOutput( $parserOutput );
3603         }
3604
3605         /**
3606          * Update all the appropriate counts in the category table, given that
3607          * we've added the categories $added and deleted the categories $deleted.
3608          *
3609          * @param $added array   The names of categories that were added
3610          * @param $deleted array The names of categories that were deleted
3611          * @return null
3612          */
3613         public function updateCategoryCounts( $added, $deleted ) {
3614                 $ns = $this->mTitle->getNamespace();
3615                 $dbw = wfGetDB( DB_MASTER );
3616
3617                 # First make sure the rows exist.  If one of the "deleted" ones didn't
3618                 # exist, we might legitimately not create it, but it's simpler to just
3619                 # create it and then give it a negative value, since the value is bogus
3620                 # anyway.
3621                 #
3622                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3623                 $insertCats = array_merge( $added, $deleted );
3624                 if( !$insertCats ) {
3625                         # Okay, nothing to do
3626                         return;
3627                 }
3628                 $insertRows = array();
3629                 foreach( $insertCats as $cat ) {
3630                         $insertRows[] = array( 'cat_title' => $cat );
3631                 }
3632                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3633
3634                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3635                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3636                 if( $ns == NS_CATEGORY ) {
3637                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3638                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3639                 } elseif( $ns == NS_FILE ) {
3640                         $addFields[]    = 'cat_files = cat_files + 1';
3641                         $removeFields[] = 'cat_files = cat_files - 1';
3642                 }
3643
3644                 if( $added ) {
3645                         $dbw->update(
3646                                 'category',
3647                                 $addFields,
3648                                 array( 'cat_title' => $added ),
3649                                 __METHOD__
3650                         );
3651                 }
3652                 if( $deleted ) {
3653                         $dbw->update(
3654                                 'category',
3655                                 $removeFields,
3656                                 array( 'cat_title' => $deleted ),
3657                                 __METHOD__
3658                         );
3659                 }
3660         }
3661 }