includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @file
   5  */
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * See design.txt for an overview.
  11  * Note: edit user interface and cache support functions have been
  12  * moved to separate EditPage and HTMLFileCache classes.
  13  *
  14  */
  15 class Article {
  16         /**@{{
  17          * @private
  18          */
  19         var $mComment = '';               // !<
  20         var $mContent;                    // !<
  21         var $mContentLoaded = false;      // !<
  22         var $mCounter = -1;               // !< Not loaded
  23         var $mCurID = -1;                 // !< Not loaded
  24         var $mDataLoaded = false;         // !<
  25         var $mForUpdate = false;          // !<
  26         var $mGoodAdjustment = 0;         // !<
  27         var $mIsRedirect = false;         // !<
  28         var $mLatest = false;             // !<
  29         var $mMinorEdit;                  // !<
  30         var $mOldId;                      // !<
  31         var $mPreparedEdit = false;       // !< Title object if set
  32         var $mRedirectedFrom = null;      // !< Title object if set
  33         var $mRedirectTarget = null;      // !< Title object if set
  34         var $mRedirectUrl = false;        // !<
  35         var $mRevIdFetched = 0;           // !<
  36         var $mRevision;                   // !<
  37         var $mTimestamp = '';             // !<
  38         var $mTitle;                      // !<
  39         var $mTotalAdjustment = 0;        // !<
  40         var $mTouched = '19700101000000'; // !<
  41         var $mUser = -1;                  // !< Not loaded
  42         var $mUserText = '';              // !<
  43         var $mParserOptions;              // !<
  44         var $mParserOutput;               // !<
  45         /**@}}*/
  46
  47         /**
  48          * Constructor and clear the article
  49          * @param $title Reference to a Title object.
  50          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  51          */
  52         public function __construct( Title $title, $oldId = null ) {
  53                 $this->mTitle =& $title;
  54                 $this->mOldId = $oldId;
  55         }
  56
  57         /**
  58          * Constructor from an article article
  59          * @param $id The article ID to load
  60          */
  61         public static function newFromID( $id ) {
  62                 $t = Title::newFromID( $id );
  63                 # FIXME: doesn't inherit right
  64                 return $t == null ? null : new self( $t );
  65                 # return $t == null ? null : new static( $t ); // PHP 5.3
  66         }
  67
  68         /**
  69          * Tell the page view functions that this view was redirected
  70          * from another page on the wiki.
  71          * @param $from Title object.
  72          */
  73         public function setRedirectedFrom( Title $from ) {
  74                 $this->mRedirectedFrom = $from;
  75         }
  76
  77         /**
  78          * If this page is a redirect, get its target
  79          *
  80          * The target will be fetched from the redirect table if possible.
  81          * If this page doesn't have an entry there, call insertRedirect()
  82          * @return mixed Title object, or null if this page is not a redirect
  83          */
  84         public function getRedirectTarget() {
  85                 if ( !$this->mTitle || !$this->mTitle->isRedirect() )
  86                         return null;
  87                 if ( !is_null( $this->mRedirectTarget ) )
  88                         return $this->mRedirectTarget;
  89                 # Query the redirect table
  90                 $dbr = wfGetDB( DB_SLAVE );
  91                 $row = $dbr->selectRow( 'redirect',
  92                         array( 'rd_namespace', 'rd_title' ),
  93                         array( 'rd_from' => $this->getID() ),
  94                         __METHOD__
  95                 );
  96                 if ( $row ) {
  97                         return $this->mRedirectTarget = Title::makeTitle( $row->rd_namespace, $row->rd_title );
  98                 }
  99                 # This page doesn't have an entry in the redirect table
 100                 return $this->mRedirectTarget = $this->insertRedirect();
 101         }
 102
 103         /**
 104          * Insert an entry for this page into the redirect table.
 105          *
 106          * Don't call this function directly unless you know what you're doing.
 107          * @return Title object
 108          */
 109         public function insertRedirect() {
 110                 $retval = Title::newFromRedirect( $this->getContent() );
 111                 if ( !$retval ) {
 112                         return null;
 113                 }
 114                 $dbw = wfGetDB( DB_MASTER );
 115                 $dbw->replace( 'redirect', array( 'rd_from' ),
 116                         array(
 117                                 'rd_from' => $this->getID(),
 118                                 'rd_namespace' => $retval->getNamespace(),
 119                                 'rd_title' => $retval->getDBkey()
 120                         ),
 121                         __METHOD__
 122                 );
 123                 return $retval;
 124         }
 125
 126         /**
 127          * Get the Title object this page redirects to
 128          *
 129          * @return mixed false, Title of in-wiki target, or string with URL
 130          */
 131         public function followRedirect() {
 132                 $text = $this->getContent();
 133                 return $this->followRedirectText( $text );
 134         }
 135
 136         /**
 137          * Get the Title object this text redirects to
 138          *
 139          * @param $text string article content containing redirect info
 140          * @return mixed false, Title of in-wiki target, or string with URL
 141          */
 142         public function followRedirectText( $text ) {
 143                 $rt = Title::newFromRedirectRecurse( $text ); // recurse through to only get the final target
 144                 # process if title object is valid and not special:userlogout
 145                 if ( $rt ) {
 146                         if ( $rt->getInterwiki() != '' ) {
 147                                 if ( $rt->isLocal() ) {
 148                                         // Offsite wikis need an HTTP redirect.
 149                                         //
 150                                         // This can be hard to reverse and may produce loops,
 151                                         // so they may be disabled in the site configuration.
 152                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 153                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 154                                 }
 155                         } else {
 156                                 if ( $rt->getNamespace() == NS_SPECIAL ) {
 157                                         // Gotta handle redirects to special pages differently:
 158                                         // Fill the HTTP response "Location" header and ignore
 159                                         // the rest of the page we're on.
 160                                         //
 161                                         // This can be hard to reverse, so they may be disabled.
 162                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 163                                                 // rolleyes
 164                                         } else {
 165                                                 return $rt->getFullURL();
 166                                         }
 167                                 }
 168                                 return $rt;
 169                         }
 170                 }
 171                 // No or invalid redirect
 172                 return false;
 173         }
 174
 175         /**
 176          * get the title object of the article
 177          * @return Title object of current title
 178          */
 179         public function getTitle() {
 180                 return $this->mTitle;
 181         }
 182
 183         /**
 184          * Clear the object
 185          * @private
 186          */
 187         public function clear() {
 188                 $this->mDataLoaded    = false;
 189                 $this->mContentLoaded = false;
 190
 191                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 192                 $this->mRedirectedFrom = null; # Title object if set
 193                 $this->mRedirectTarget = null; # Title object if set
 194                 $this->mUserText =
 195                 $this->mTimestamp = $this->mComment = '';
 196                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 197                 $this->mTouched = '19700101000000';
 198                 $this->mForUpdate = false;
 199                 $this->mIsRedirect = false;
 200                 $this->mRevIdFetched = 0;
 201                 $this->mRedirectUrl = false;
 202                 $this->mLatest = false;
 203                 $this->mPreparedEdit = false;
 204         }
 205
 206         /**
 207          * Note that getContent/loadContent do not follow redirects anymore.
 208          * If you need to fetch redirectable content easily, try
 209          * the shortcut in Article::followContent()
 210          *
 211          * @return Return the text of this revision
 212          */
 213         public function getContent() {
 214                 global $wgUser, $wgContLang, $wgOut, $wgMessageCache;
 215                 wfProfileIn( __METHOD__ );
 216                 if ( $this->getID() === 0 ) {
 217                         # If this is a MediaWiki:x message, then load the messages
 218                         # and return the message value for x.
 219                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 220                                 # If this is a system message, get the default text.
 221                                 list( $message, $lang ) = $wgMessageCache->figureMessage( $wgContLang->lcfirst( $this->mTitle->getText() ) );
 222                                 $wgMessageCache->loadAllMessages( $lang );
 223                                 $text = wfMsgGetKey( $message, false, $lang, false );
 224                                 if ( wfEmptyMsg( $message, $text ) )
 225                                         $text = '';
 226                         } else {
 227                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 228                         }
 229                         wfProfileOut( __METHOD__ );
 230                         return $text;
 231                 } else {
 232                         $this->loadContent();
 233                         wfProfileOut( __METHOD__ );
 234                         return $this->mContent;
 235                 }
 236         }
 237
 238         /**
 239          * Get the text of the current revision. No side-effects...
 240          *
 241          * @return Return the text of the current revision
 242          */
 243         public function getRawText() {
 244                 // Check process cache for current revision
 245                 if ( $this->mContentLoaded && $this->mOldId == 0 ) {
 246                         return $this->mContent;
 247                 }
 248                 $rev = Revision::newFromTitle( $this->mTitle );
 249                 $text = $rev ? $rev->getRawText() : false;
 250                 return $text;
 251         }
 252
 253         /**
 254          * This function returns the text of a section, specified by a number ($section).
 255          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 256          * the first section before any such heading (section 0).
 257          *
 258          * If a section contains subsections, these are also returned.
 259          *
 260          * @param $text String: text to look in
 261          * @param $section Integer: section number
 262          * @return string text of the requested section
 263          * @deprecated
 264          */
 265         public function getSection( $text, $section ) {
 266                 global $wgParser;
 267                 return $wgParser->getSection( $text, $section );
 268         }
 269
 270         /**
 271          * Get the text that needs to be saved in order to undo all revisions
 272          * between $undo and $undoafter. Revisions must belong to the same page,
 273          * must exist and must not be deleted
 274          * @param $undo Revision
 275          * @param $undoafter Revision Must be an earlier revision than $undo
 276          * @return mixed string on success, false on failure
 277          */
 278         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 279                 $undo_text = $undo->getText();
 280                 $undoafter_text = $undoafter->getText();
 281                 $cur_text = $this->getContent();
 282                 if ( $cur_text == $undo_text ) {
 283                         # No use doing a merge if it's just a straight revert.
 284                         return $undoafter_text;
 285                 }
 286                 $undone_text = '';
 287                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) )
 288                         return false;
 289                 return $undone_text;
 290         }
 291
 292         /**
 293          * @return int The oldid of the article that is to be shown, 0 for the
 294          *             current revision
 295          */
 296         public function getOldID() {
 297                 if ( is_null( $this->mOldId ) ) {
 298                         $this->mOldId = $this->getOldIDFromRequest();
 299                 }
 300                 return $this->mOldId;
 301         }
 302
 303         /**
 304          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 305          *
 306          * @return int The old id for the request
 307          */
 308         public function getOldIDFromRequest() {
 309                 global $wgRequest;
 310                 $this->mRedirectUrl = false;
 311                 $oldid = $wgRequest->getVal( 'oldid' );
 312                 if ( isset( $oldid ) ) {
 313                         $oldid = intval( $oldid );
 314                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 315                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 316                                 if ( $nextid  ) {
 317                                         $oldid = $nextid;
 318                                 } else {
 319                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 320                                 }
 321                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 322                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 323                                 if ( $previd ) {
 324                                         $oldid = $previd;
 325                                 }
 326                         }
 327                 }
 328                 if ( !$oldid ) {
 329                         $oldid = 0;
 330                 }
 331                 return $oldid;
 332         }
 333
 334         /**
 335          * Load the revision (including text) into this object
 336          */
 337         function loadContent() {
 338                 if ( $this->mContentLoaded ) return;
 339                 wfProfileIn( __METHOD__ );
 340                 # Query variables :P
 341                 $oldid = $this->getOldID();
 342                 # Pre-fill content with error message so that if something
 343                 # fails we'll have something telling us what we intended.
 344                 $this->mOldId = $oldid;
 345                 $this->fetchContent( $oldid );
 346                 wfProfileOut( __METHOD__ );
 347         }
 348
 349
 350         /**
 351          * Fetch a page record with the given conditions
 352          * @param $dbr Database object
 353          * @param $conditions Array
 354          * @return mixed Database result resource, or false on failure
 355          */
 356         protected function pageData( $dbr, $conditions ) {
 357                 $fields = array(
 358                                 'page_id',
 359                                 'page_namespace',
 360                                 'page_title',
 361                                 'page_restrictions',
 362                                 'page_counter',
 363                                 'page_is_redirect',
 364                                 'page_is_new',
 365                                 'page_random',
 366                                 'page_touched',
 367                                 'page_latest',
 368                                 'page_len',
 369                 );
 370                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 371                 $row = $dbr->selectRow(
 372                         'page',
 373                         $fields,
 374                         $conditions,
 375                         __METHOD__
 376                 );
 377                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 378                 return $row ;
 379         }
 380
 381         /**
 382          * Fetch a page record matching the Title object's namespace and title
 383          * using a sanitized title string
 384          *
 385          * @param $dbr Database object
 386          * @param $title Title object
 387          * @return mixed Database result resource, or false on failure
 388          */
 389         public function pageDataFromTitle( $dbr, $title ) {
 390                 return $this->pageData( $dbr, array(
 391                         'page_namespace' => $title->getNamespace(),
 392                         'page_title'     => $title->getDBkey() ) );
 393         }
 394
 395         /**
 396          * Fetch a page record matching the requested ID
 397          *
 398          * @param $dbr Database
 399          * @param $id Integer
 400          */
 401         protected function pageDataFromId( $dbr, $id ) {
 402                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 403         }
 404
 405         /**
 406          * Set the general counter, title etc data loaded from
 407          * some source.
 408          *
 409          * @param $data Database row object or "fromdb"
 410          */
 411         public function loadPageData( $data = 'fromdb' ) {
 412                 if ( $data === 'fromdb' ) {
 413                         $dbr = wfGetDB( DB_MASTER );
 414                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 415                 }
 416
 417                 $lc = LinkCache::singleton();
 418                 if ( $data ) {
 419                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 420
 421                         $this->mTitle->mArticleID = intval( $data->page_id );
 422
 423                         # Old-fashioned restrictions
 424                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 425
 426                         $this->mCounter     = intval( $data->page_counter );
 427                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 428                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 429                         $this->mLatest      = intval( $data->page_latest );
 430                 } else {
 431                         if ( is_object( $this->mTitle ) ) {
 432                                 $lc->addBadLinkObj( $this->mTitle );
 433                         }
 434                         $this->mTitle->mArticleID = 0;
 435                 }
 436
 437                 $this->mDataLoaded  = true;
 438         }
 439
 440         /**
 441          * Get text of an article from database
 442          * Does *NOT* follow redirects.
 443          *
 444          * @param $oldid Int: 0 for whatever the latest revision is
 445          * @return mixed string containing article contents, or false if null
 446          */
 447         function fetchContent( $oldid = 0 ) {
 448                 if ( $this->mContentLoaded ) {
 449                         return $this->mContent;
 450                 }
 451
 452                 $dbr = wfGetDB( DB_MASTER );
 453
 454                 # Pre-fill content with error message so that if something
 455                 # fails we'll have something telling us what we intended.
 456                 $t = $this->mTitle->getPrefixedText();
 457                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 458                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 459
 460                 if ( $oldid ) {
 461                         $revision = Revision::newFromId( $oldid );
 462                         if ( is_null( $revision ) ) {
 463                                 wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 464                                 return false;
 465                         }
 466                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 467                         if ( !$data ) {
 468                                 wfDebug( __METHOD__ . " failed to get page data linked to revision id $oldid\n" );
 469                                 return false;
 470                         }
 471                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 472                         $this->loadPageData( $data );
 473                 } else {
 474                         if ( !$this->mDataLoaded ) {
 475                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 476                                 if ( !$data ) {
 477                                         wfDebug( __METHOD__ . " failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 478                                         return false;
 479                                 }
 480                                 $this->loadPageData( $data );
 481                         }
 482                         $revision = Revision::newFromId( $this->mLatest );
 483                         if ( is_null( $revision ) ) {
 484                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id {$this->mLatest}\n" );
 485                                 return false;
 486                         }
 487                 }
 488
 489                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 490                 // We should instead work with the Revision object when we need it...
 491                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 492
 493                 $this->mUser      = $revision->getUser();
 494                 $this->mUserText  = $revision->getUserText();
 495                 $this->mComment   = $revision->getComment();
 496                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 497
 498                 $this->mRevIdFetched = $revision->getId();
 499                 $this->mContentLoaded = true;
 500                 $this->mRevision =& $revision;
 501
 502                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 503
 504                 return $this->mContent;
 505         }
 506
 507         /**
 508          * Read/write accessor to select FOR UPDATE
 509          *
 510          * @param $x Mixed: FIXME
 511          * @return
 512          */
 513         public function forUpdate( $x = null ) {
 514                 return wfSetVar( $this->mForUpdate, $x );
 515         }
 516
 517         /**
 518          * Get the database which should be used for reads
 519          *
 520          * @return Database
 521          * @deprecated - just call wfGetDB( DB_MASTER ) instead
 522          */
 523         function getDB() {
 524                 wfDeprecated( __METHOD__ );
 525                 return wfGetDB( DB_MASTER );
 526         }
 527
 528         /**
 529          * Get options for all SELECT statements
 530          *
 531          * @param $options Array: an optional options array which'll be appended to
 532          *                       the default
 533          * @return Array: options
 534          */
 535         protected function getSelectOptions( $options = '' ) {
 536                 if ( $this->mForUpdate ) {
 537                         if ( is_array( $options ) ) {
 538                                 $options[] = 'FOR UPDATE';
 539                         } else {
 540                                 $options = 'FOR UPDATE';
 541                         }
 542                 }
 543                 return $options;
 544         }
 545
 546         /**
 547          * @return int Page ID
 548          */
 549         public function getID() {
 550                 if ( $this->mTitle ) {
 551                         return $this->mTitle->getArticleID();
 552                 } else {
 553                         return 0;
 554                 }
 555         }
 556
 557         /**
 558          * @return bool Whether or not the page exists in the database
 559          */
 560         public function exists() {
 561                 return $this->getId() > 0;
 562         }
 563
 564         /**
 565          * Check if this page is something we're going to be showing
 566          * some sort of sensible content for. If we return false, page
 567          * views (plain action=view) will return an HTTP 404 response,
 568          * so spiders and robots can know they're following a bad link.
 569          *
 570          * @return bool
 571          */
 572         public function hasViewableContent() {
 573                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 574         }
 575
 576         /**
 577          * @return int The view count for the page
 578          */
 579         public function getCount() {
 580                 if ( -1 == $this->mCounter ) {
 581                         $id = $this->getID();
 582                         if ( $id == 0 ) {
 583                                 $this->mCounter = 0;
 584                         } else {
 585                                 $dbr = wfGetDB( DB_SLAVE );
 586                                 $this->mCounter = $dbr->selectField( 'page',
 587                                         'page_counter',
 588                                         array( 'page_id' => $id ),
 589                                         __METHOD__,
 590                                         $this->getSelectOptions()
 591                                 );
 592                         }
 593                 }
 594                 return $this->mCounter;
 595         }
 596
 597         /**
 598          * Determine whether a page  would be suitable for being counted as an
 599          * article in the site_stats table based on the title & its content
 600          *
 601          * @param $text String: text to analyze
 602          * @return bool
 603          */
 604         public function isCountable( $text ) {
 605                 global $wgUseCommaCount;
 606
 607                 $token = $wgUseCommaCount ? ',' : '[[';
 608                 return $this->mTitle->isContentPage() && !$this->isRedirect( $text ) && in_string( $token, $text );
 609         }
 610
 611         /**
 612          * Tests if the article text represents a redirect
 613          *
 614          * @param $text String: FIXME
 615          * @return bool
 616          */
 617         public function isRedirect( $text = false ) {
 618                 if ( $text === false ) {
 619                         if ( $this->mDataLoaded ) {
 620                                 return $this->mIsRedirect;
 621                         }
 622                         // Apparently loadPageData was never called
 623                         $this->loadContent();
 624                         $titleObj = Title::newFromRedirectRecurse( $this->fetchContent() );
 625                 } else {
 626                         $titleObj = Title::newFromRedirect( $text );
 627                 }
 628                 return $titleObj !== null;
 629         }
 630
 631         /**
 632          * Returns true if the currently-referenced revision is the current edit
 633          * to this page (and it exists).
 634          * @return bool
 635          */
 636         public function isCurrent() {
 637                 # If no oldid, this is the current version.
 638                 if ( $this->getOldID() == 0 ) {
 639                         return true;
 640                 }
 641                 return $this->exists() && isset( $this->mRevision ) && $this->mRevision->isCurrent();
 642         }
 643
 644         /**
 645          * Loads everything except the text
 646          * This isn't necessary for all uses, so it's only done if needed.
 647          */
 648         protected function loadLastEdit() {
 649                 if ( -1 != $this->mUser )
 650                         return;
 651
 652                 # New or non-existent articles have no user information
 653                 $id = $this->getID();
 654                 if ( 0 == $id ) return;
 655
 656                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 657                 if ( !is_null( $this->mLastRevision ) ) {
 658                         $this->mUser      = $this->mLastRevision->getUser();
 659                         $this->mUserText  = $this->mLastRevision->getUserText();
 660                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 661                         $this->mComment   = $this->mLastRevision->getComment();
 662                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 663                         $this->mRevIdFetched = $this->mLastRevision->getId();
 664                 }
 665         }
 666
 667         public function getTimestamp() {
 668                 // Check if the field has been filled by ParserCache::get()
 669                 if ( !$this->mTimestamp ) {
 670                         $this->loadLastEdit();
 671                 }
 672                 return wfTimestamp( TS_MW, $this->mTimestamp );
 673         }
 674
 675         public function getUser() {
 676                 $this->loadLastEdit();
 677                 return $this->mUser;
 678         }
 679
 680         public function getUserText() {
 681                 $this->loadLastEdit();
 682                 return $this->mUserText;
 683         }
 684
 685         public function getComment() {
 686                 $this->loadLastEdit();
 687                 return $this->mComment;
 688         }
 689
 690         public function getMinorEdit() {
 691                 $this->loadLastEdit();
 692                 return $this->mMinorEdit;
 693         }
 694
 695         /* Use this to fetch the rev ID used on page views */
 696         public function getRevIdFetched() {
 697                 $this->loadLastEdit();
 698                 return $this->mRevIdFetched;
 699         }
 700
 701         /**
 702          * @param $limit Integer: default 0.
 703          * @param $offset Integer: default 0.
 704          */
 705         public function getContributors( $limit = 0, $offset = 0 ) {
 706                 # XXX: this is expensive; cache this info somewhere.
 707
 708                 $dbr = wfGetDB( DB_SLAVE );
 709                 $revTable = $dbr->tableName( 'revision' );
 710                 $userTable = $dbr->tableName( 'user' );
 711
 712                 $pageId = $this->getId();
 713
 714                 $user = $this->getUser();
 715                 if ( $user ) {
 716                         $excludeCond = "AND rev_user != $user";
 717                 } else {
 718                         $userText = $dbr->addQuotes( $this->getUserText() );
 719                         $excludeCond = "AND rev_user_text != $userText";
 720                 }
 721
 722                 $deletedBit = $dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER ); // username hidden?
 723
 724                 $sql = "SELECT {$userTable}.*, rev_user_text as user_name, MAX(rev_timestamp) as timestamp
 725                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 726                         WHERE rev_page = $pageId
 727                         $excludeCond
 728                         AND $deletedBit = 0
 729                         GROUP BY rev_user, rev_user_text
 730                         ORDER BY timestamp DESC";
 731
 732                 if ( $limit > 0 )
 733                         $sql = $dbr->limitResult( $sql, $limit, $offset );
 734
 735                 $sql .= ' ' . $this->getSelectOptions();
 736                 $res = $dbr->query( $sql, __METHOD__ );
 737
 738                 return new UserArrayFromResult( $res );
 739         }
 740
 741         /**
 742          * This is the default action of the index.php entry point: just view the
 743          * page of the given title.
 744          */
 745         public function view() {
 746                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 747                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 748                 global $wgUseTrackbacks, $wgUseFileCache;
 749
 750                 wfProfileIn( __METHOD__ );
 751
 752                 # Get variables from query string
 753                 $oldid = $this->getOldID();
 754                 $parserCache = ParserCache::singleton();
 755
 756                 $parserOptions = clone $this->getParserOptions();
 757                 # Render printable version, use printable version cache
 758                 if ( $wgOut->isPrintable() ) {
 759                         $parserOptions->setIsPrintable( true );
 760                 }
 761
 762                 # Try client and file cache
 763                 if ( $oldid === 0 && $this->checkTouched() ) {
 764                         global $wgUseETag;
 765                         if ( $wgUseETag ) {
 766                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 767                         }
 768                         # Is is client cached?
 769                         if ( $wgOut->checkLastModified( $this->getTouched() ) ) {
 770                                 wfDebug( __METHOD__ . ": done 304\n" );
 771                                 wfProfileOut( __METHOD__ );
 772                                 return;
 773                         # Try file cache
 774                         } else if ( $wgUseFileCache && $this->tryFileCache() ) {
 775                                 wfDebug( __METHOD__ . ": done file cache\n" );
 776                                 # tell wgOut that output is taken care of
 777                                 $wgOut->disable();
 778                                 $this->viewUpdates();
 779                                 wfProfileOut( __METHOD__ );
 780                                 return;
 781                         }
 782                 }
 783
 784                 $sk = $wgUser->getSkin();
 785
 786                 # getOldID may want us to redirect somewhere else
 787                 if ( $this->mRedirectUrl ) {
 788                         $wgOut->redirect( $this->mRedirectUrl );
 789                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 790                         wfProfileOut( __METHOD__ );
 791                         return;
 792                 }
 793
 794                 $wgOut->setArticleFlag( true );
 795                 # Set page title (may be overridden by DISPLAYTITLE)
 796                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 797
 798                 # If we got diff in the query, we want to see a diff page instead of the article.
 799                 if ( !is_null( $wgRequest->getVal( 'diff' ) ) ) {
 800                         wfDebug( __METHOD__ . ": showing diff page\n" );
 801                         $this->showDiffPage();
 802                         wfProfileOut( __METHOD__ );
 803                         return;
 804                 }
 805
 806                 # Should the parser cache be used?
 807                 $useParserCache = $this->useParserCache( $oldid );
 808                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 809                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 810                         wfIncrStats( 'pcache_miss_stub' );
 811                 }
 812
 813                 # For the main page, overwrite the <title> element with the con-
 814                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 815                 # that's not empty).
 816                 if ( $this->mTitle->equals( Title::newMainPage() )
 817                         && ( $m = wfMsgForContent( 'pagetitle-view-mainpage' ) ) !== '' )
 818                 {
 819                         $wgOut->setHTMLTitle( $m );
 820                 }
 821
 822                 $wasRedirected = $this->showRedirectedFromHeader();
 823                 $this->showNamespaceHeader();
 824
 825                 # Iterate through the possible ways of constructing the output text.
 826                 # Keep going until $outputDone is set, or we run out of things to do.
 827                 $pass = 0;
 828                 $outputDone = false;
 829                 while ( !$outputDone && ++$pass ) {
 830                         switch( $pass ) {
 831                                 case 1:
 832                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 833                                         break;
 834
 835                                 case 2:
 836                                         # Try the parser cache
 837                                         if ( $useParserCache ) {
 838                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 839                                                 if ( $this->mParserOutput !== false ) {
 840                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 841                                                         $wgOut->addParserOutput( $this->mParserOutput );
 842                                                         # Ensure that UI elements requiring revision ID have
 843                                                         # the correct version information.
 844                                                         $wgOut->setRevisionId( $this->mLatest );
 845                                                         $outputDone = true;
 846                                                 }
 847                                         }
 848                                         break;
 849
 850                                 case 3:
 851                                         $text = $this->getContent();
 852                                         if ( $text === false || $this->getID() == 0 ) {
 853                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 854                                                 $this->showMissingArticle();
 855                                                 wfProfileOut( __METHOD__ );
 856                                                 return;
 857                                         }
 858
 859                                         # Another whitelist check in case oldid is altering the title
 860                                         if ( !$this->mTitle->userCanRead() ) {
 861                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 862                                                 $wgOut->loginToUse();
 863                                                 $wgOut->output();
 864                                                 $wgOut->disable();
 865                                                 wfProfileOut( __METHOD__ );
 866                                                 return;
 867                                         }
 868
 869                                         # Are we looking at an old revision
 870                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 871                                                 $this->setOldSubtitle( $oldid );
 872                                                 if ( !$this->showDeletedRevisionHeader() ) {
 873                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 874                                                         wfProfileOut( __METHOD__ );
 875                                                         return;
 876                                                 }
 877                                                 # If this "old" version is the current, then try the parser cache...
 878                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
 879                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 880                                                         if ( $this->mParserOutput ) {
 881                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 882                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 883                                                                 $wgOut->setRevisionId( $this->mLatest );
 884                                                                 $this->showViewFooter();
 885                                                                 $this->viewUpdates();
 886                                                                 wfProfileOut( __METHOD__ );
 887                                                                 return;
 888                                                         }
 889                                                 }
 890                                         }
 891
 892                                         # Ensure that UI elements requiring revision ID have
 893                                         # the correct version information.
 894                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 895
 896                                         # Pages containing custom CSS or JavaScript get special treatment
 897                                         if ( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 898                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 899                                                 $this->showCssOrJsPage();
 900                                                 $outputDone = true;
 901                                         } else if ( $rt = Title::newFromRedirectArray( $text ) ) {
 902                                                 wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 903                                                 # Viewing a redirect page (e.g. with parameter redirect=no)
 904                                                 # Don't append the subtitle if this was an old revision
 905                                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 906                                                 # Parse just to get categories, displaytitle, etc.
 907                                                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
 908                                                 $wgOut->addParserOutputNoText( $this->mParserOutput );
 909                                                 $outputDone = true;
 910                                         }
 911                                         break;
 912
 913                                 case 4:
 914                                         # Run the parse, protected by a pool counter
 915                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 916                                         $key = $parserCache->getKey( $this, $parserOptions );
 917                                         $poolCounter = PoolCounter::factory( 'Article::view', $key );
 918                                         $dirtyCallback = $useParserCache ? array( $this, 'tryDirtyCache' ) : false;
 919                                         $status = $poolCounter->executeProtected( array( $this, 'doViewParse' ), $dirtyCallback );
 920
 921                                         if ( !$status->isOK() ) {
 922                                                 # Connection or timeout error
 923                                                 $this->showPoolError( $status );
 924                                                 wfProfileOut( __METHOD__ );
 925                                                 return;
 926                                         } else {
 927                                                 $outputDone = true;
 928                                         }
 929                                         break;
 930
 931                                 # Should be unreachable, but just in case...
 932                                 default:
 933                                         break 2;
 934                         }
 935                 }
 936
 937                 # Now that we've filled $this->mParserOutput, we know whether
 938                 # there are any __NOINDEX__ tags on the page
 939                 $policy = $this->getRobotPolicy( 'view' );
 940                 $wgOut->setIndexPolicy( $policy['index'] );
 941                 $wgOut->setFollowPolicy( $policy['follow'] );
 942
 943                 $this->showViewFooter();
 944                 $this->viewUpdates();
 945                 wfProfileOut( __METHOD__ );
 946         }
 947
 948         /**
 949          * Show a diff page according to current request variables. For use within
 950          * Article::view() only, other callers should use the DifferenceEngine class.
 951          */
 952         public function showDiffPage() {
 953                 global $wgOut, $wgRequest, $wgUser;
 954
 955                 $diff = $wgRequest->getVal( 'diff' );
 956                 $rcid = $wgRequest->getVal( 'rcid' );
 957                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 958                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 959                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
 960                 $oldid = $this->getOldID();
 961
 962                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $unhide );
 963                 // DifferenceEngine directly fetched the revision:
 964                 $this->mRevIdFetched = $de->mNewid;
 965                 $de->showDiffPage( $diffOnly );
 966
 967                 // Needed to get the page's current revision
 968                 $this->loadPageData();
 969                 if ( $diff == 0 || $diff == $this->mLatest ) {
 970                         # Run view updates for current revision only
 971                         $this->viewUpdates();
 972                 }
 973         }
 974
 975         /**
 976          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 977          * Article::view() only.
 978          *
 979          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
 980          * page views.
 981          */
 982         public function showCssOrJsPage() {
 983                 global $wgOut;
 984                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
 985                 // Give hooks a chance to customise the output
 986                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 987                         // Wrap the whole lot in a <pre> and don't parse
 988                         $m = array();
 989                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 990                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 991                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 992                         $wgOut->addHTML( "\n</pre>\n" );
 993                 }
 994         }
 995
 996         /**
 997          * Get the robot policy to be used for the current action=view request.
 998          * @return String the policy that should be set
 999          * @deprecated use getRobotPolicy() instead, which returns an associative
1000          *    array
1001          */
1002         public function getRobotPolicyForView() {
1003                 wfDeprecated( __FUNC__ );
1004                 $policy = $this->getRobotPolicy( 'view' );
1005                 return $policy['index'] . ',' . $policy['follow'];
1006         }
1007
1008         /**
1009          * Get the robot policy to be used for the current view
1010          * @param $action String the action= GET parameter
1011          * @return Array the policy that should be set
1012          * TODO: actions other than 'view'
1013          */
1014         public function getRobotPolicy( $action ) {
1015
1016                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1017                 global $wgDefaultRobotPolicy, $wgRequest;
1018
1019                 $ns = $this->mTitle->getNamespace();
1020                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
1021                         # Don't index user and user talk pages for blocked users (bug 11443)
1022                         if ( !$this->mTitle->isSubpage() ) {
1023                                 $block = new Block();
1024                                 if ( $block->load( $this->mTitle->getText() ) ) {
1025                                         return array( 'index'  => 'noindex',
1026                                                       'follow' => 'nofollow' );
1027                                 }
1028                         }
1029                 }
1030
1031                 if ( $this->getID() === 0 || $this->getOldID() ) {
1032                         # Non-articles (special pages etc), and old revisions
1033                         return array( 'index'  => 'noindex',
1034                                       'follow' => 'nofollow' );
1035                 } elseif ( $wgOut->isPrintable() ) {
1036                         # Discourage indexing of printable versions, but encourage following
1037                         return array( 'index'  => 'noindex',
1038                                       'follow' => 'follow' );
1039                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
1040                         # For ?curid=x urls, disallow indexing
1041                         return array( 'index'  => 'noindex',
1042                                       'follow' => 'follow' );
1043                 }
1044
1045                 # Otherwise, construct the policy based on the various config variables.
1046                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1047
1048                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1049                         # Honour customised robot policies for this namespace
1050                         $policy = array_merge( $policy,
1051                                                self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] ) );
1052                 }
1053                 if ( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
1054                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1055                         # a final sanity check that we have really got the parser output.
1056                         $policy = array_merge( $policy,
1057                                                array( 'index' => $this->mParserOutput->getIndexPolicy() ) );
1058                 }
1059
1060                 if ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
1061                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1062                         $policy = array_merge( $policy,
1063                                                self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) );
1064                 }
1065
1066                 return $policy;
1067
1068         }
1069
1070         /**
1071          * Converts a String robot policy into an associative array, to allow
1072          * merging of several policies using array_merge().
1073          * @param $policy Mixed, returns empty array on null/false/'', transparent
1074          *            to already-converted arrays, converts String.
1075          * @return associative Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1076          */
1077         public static function formatRobotPolicy( $policy ) {
1078                 if ( is_array( $policy ) ) {
1079                         return $policy;
1080                 } elseif ( !$policy ) {
1081                         return array();
1082                 }
1083
1084                 $policy = explode( ',', $policy );
1085                 $policy = array_map( 'trim', $policy );
1086
1087                 $arr = array();
1088                 foreach ( $policy as $var ) {
1089                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
1090                                 $arr['index'] = $var;
1091                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
1092                                 $arr['follow'] = $var;
1093                         }
1094                 }
1095                 return $arr;
1096         }
1097
1098         /**
1099          * If this request is a redirect view, send "redirected from" subtitle to
1100          * $wgOut. Returns true if the header was needed, false if this is not a
1101          * redirect view. Handles both local and remote redirects.
1102          */
1103         public function showRedirectedFromHeader() {
1104                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1105
1106                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1107                 $sk = $wgUser->getSkin();
1108                 if ( isset( $this->mRedirectedFrom ) ) {
1109                         // This is an internally redirected page view.
1110                         // We'll need a backlink to the source page for navigation.
1111                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1112                                 $redir = $sk->link(
1113                                         $this->mRedirectedFrom,
1114                                         null,
1115                                         array(),
1116                                         array( 'redirect' => 'no' ),
1117                                         array( 'known', 'noclasses' )
1118                                 );
1119                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1120                                 $wgOut->setSubtitle( $s );
1121
1122                                 // Set the fragment if one was specified in the redirect
1123                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
1124                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1125                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1126                                 }
1127
1128                                 // Add a <link rel="canonical"> tag
1129                                 $wgOut->addLink( array( 'rel' => 'canonical',
1130                                         'href' => $this->mTitle->getLocalURL() )
1131                                 );
1132                                 return true;
1133                         }
1134                 } elseif ( $rdfrom ) {
1135                         // This is an externally redirected view, from some other wiki.
1136                         // If it was reported from a trusted site, supply a backlink.
1137                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1138                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
1139                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1140                                 $wgOut->setSubtitle( $s );
1141                                 return true;
1142                         }
1143                 }
1144                 return false;
1145         }
1146
1147         /**
1148          * Show a header specific to the namespace currently being viewed, like
1149          * [[MediaWiki:Talkpagetext]]. For Article::view().
1150          */
1151         public function showNamespaceHeader() {
1152                 global $wgOut;
1153                 if ( $this->mTitle->isTalkPage() ) {
1154                         $msg = wfMsgNoTrans( 'talkpageheader' );
1155                         if ( $msg !== '-' && !wfEmptyMsg( 'talkpageheader', $msg ) ) {
1156                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1</div>", array( 'talkpageheader' ) );
1157                         }
1158                 }
1159         }
1160
1161         /**
1162          * Show the footer section of an ordinary page view
1163          */
1164         public function showViewFooter() {
1165                 global $wgOut, $wgUseTrackbacks, $wgRequest;
1166                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1167                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1168                         $wgOut->addWikiMsg( 'anontalkpagetext' );
1169                 }
1170
1171                 # If we have been passed an &rcid= parameter, we want to give the user a
1172                 # chance to mark this new article as patrolled.
1173                 $this->showPatrolFooter();
1174
1175                 # Trackbacks
1176                 if ( $wgUseTrackbacks ) {
1177                         $this->addTrackbacks();
1178                 }
1179         }
1180
1181         /**
1182          * If patrol is possible, output a patrol UI box. This is called from the
1183          * footer section of ordinary page views. If patrol is not possible or not
1184          * desired, does nothing.
1185          */
1186         public function showPatrolFooter() {
1187                 global $wgOut, $wgRequest, $wgUser;
1188                 $rcid = $wgRequest->getVal( 'rcid' );
1189
1190                 if ( !$rcid || !$this->mTitle->exists() || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1191                         return;
1192                 }
1193
1194                 $sk = $wgUser->getSkin();
1195
1196                 $wgOut->addHTML(
1197                         "<div class='patrollink'>" .
1198                                 wfMsgHtml(
1199                                         'markaspatrolledlink',
1200                                         $sk->link(
1201                                                 $this->mTitle,
1202                                                 wfMsgHtml( 'markaspatrolledtext' ),
1203                                                 array(),
1204                                                 array(
1205                                                         'action' => 'markpatrolled',
1206                                                         'rcid' => $rcid
1207                                                 ),
1208                                                 array( 'known', 'noclasses' )
1209                                         )
1210                                 ) .
1211                         '</div>'
1212                 );
1213         }
1214
1215         /**
1216          * Show the error text for a missing article. For articles in the MediaWiki
1217          * namespace, show the default message text. To be called from Article::view().
1218          */
1219         public function showMissingArticle() {
1220                 global $wgOut, $wgRequest, $wgUser;
1221
1222                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1223                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1224                         $parts = explode( '/', $this->mTitle->getText() );
1225                         $rootPart = $parts[0];
1226                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1227                         $ip = User::isIP( $rootPart );
1228                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
1229                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1</div>",
1230                                         array( 'userpage-userdoesnotexist-view', $rootPart ) );
1231                         } else if ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1232                                 LogEventsList::showLogExtract(
1233                                         $wgOut,
1234                                         'block',
1235                                         $user->getUserPage()->getPrefixedText(),
1236                                         '',
1237                                         array(
1238                                                 'lim' => 1,
1239                                                 'showIfEmpty' => false,
1240                                                 'msgKey' => array(
1241                                                         'blocked-notice-logextract',
1242                                                         $user->getName() # Support GENDER in notice
1243                                                 )
1244                                         )
1245                                 );
1246                         }
1247                 }
1248                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1249                 # Show delete and move logs
1250                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1251                         array(  'lim' => 10,
1252                                 'conds' => array( "log_action != 'revision'" ),
1253                                 'showIfEmpty' => false,
1254                                 'msgKey' => array( 'moveddeleted-notice' ) )
1255                 );
1256
1257                 # Show error message
1258                 $oldid = $this->getOldID();
1259                 if ( $oldid ) {
1260                         $text = wfMsgNoTrans( 'missing-article',
1261                                 $this->mTitle->getPrefixedText(),
1262                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1263                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1264                         // Use the default message text
1265                         $text = $this->getContent();
1266                 } else {
1267                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1268                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1269                         $errors = array_merge( $createErrors, $editErrors );
1270
1271                         if ( !count( $errors ) )
1272                                 $text = wfMsgNoTrans( 'noarticletext' );
1273                         else
1274                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1275                 }
1276                 $text = "<div class='noarticletext'>\n$text\n</div>";
1277                 if ( !$this->hasViewableContent() ) {
1278                         // If there's no backing content, send a 404 Not Found
1279                         // for better machine handling of broken links.
1280                         $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
1281                 }
1282                 $wgOut->addWikiText( $text );
1283         }
1284
1285         /**
1286          * If the revision requested for view is deleted, check permissions.
1287          * Send either an error message or a warning header to $wgOut.
1288          * Returns true if the view is allowed, false if not.
1289          */
1290         public function showDeletedRevisionHeader() {
1291                 global $wgOut, $wgRequest;
1292                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1293                         // Not deleted
1294                         return true;
1295                 }
1296                 // If the user is not allowed to see it...
1297                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1298                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
1299                                 'rev-deleted-text-permission' );
1300                         return false;
1301                 // If the user needs to confirm that they want to see it...
1302                 } else if ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1303                         # Give explanation and add a link to view the revision...
1304                         $oldid = intval( $this->getOldID() );
1305                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1306                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1307                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1308                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
1309                                 array( $msg, $link ) );
1310                         return false;
1311                 // We are allowed to see...
1312                 } else {
1313                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1314                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1315                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", $msg );
1316                         return true;
1317                 }
1318         }
1319
1320         /*
1321         * Should the parser cache be used?
1322         */
1323         public function useParserCache( $oldid ) {
1324                 global $wgUser, $wgEnableParserCache;
1325
1326                 return $wgEnableParserCache
1327                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
1328                         && $this->exists()
1329                         && empty( $oldid )
1330                         && !$this->mTitle->isCssOrJsPage()
1331                         && !$this->mTitle->isCssJsSubpage();
1332         }
1333
1334         /**
1335          * Execute the uncached parse for action=view
1336          */
1337         public function doViewParse() {
1338                 global $wgOut;
1339                 $oldid = $this->getOldID();
1340                 $useParserCache = $this->useParserCache( $oldid );
1341                 $parserOptions = clone $this->getParserOptions();
1342                 # Render printable version, use printable version cache
1343                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1344                 # Don't show section-edit links on old revisions... this way lies madness.
1345                 $parserOptions->setEditSection( $this->isCurrent() );
1346                 $useParserCache = $this->useParserCache( $oldid );
1347                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1348         }
1349
1350         /**
1351          * Try to fetch an expired entry from the parser cache. If it is present,
1352          * output it and return true. If it is not present, output nothing and
1353          * return false. This is used as a callback function for
1354          * PoolCounter::executeProtected().
1355          */
1356         public function tryDirtyCache() {
1357                 global $wgOut;
1358                 $parserCache = ParserCache::singleton();
1359                 $options = $this->getParserOptions();
1360                 $options->setIsPrintable( $wgOut->isPrintable() );
1361                 $output = $parserCache->getDirty( $this, $options );
1362                 if ( $output ) {
1363                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1364                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1365                         $wgOut->setSquidMaxage( 0 );
1366                         $this->mParserOutput = $output;
1367                         $wgOut->addParserOutput( $output );
1368                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1369                         return true;
1370                 } else {
1371                         wfDebugLog( 'dirty', "dirty missing\n" );
1372                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1373                         return false;
1374                 }
1375         }
1376
1377         /**
1378          * Show an error page for an error from the pool counter.
1379          * @param $status Status
1380          */
1381         public function showPoolError( $status ) {
1382                 global $wgOut;
1383                 $wgOut->clearHTML(); // for release() errors
1384                 $wgOut->enableClientCache( false );
1385                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1386                 $wgOut->addWikiText(
1387                         '<div class="errorbox">' .
1388                         $status->getWikiText( false, 'view-pool-error' ) .
1389                         '</div>'
1390                 );
1391         }
1392
1393         /**
1394          * View redirect
1395          * @param $target Title object or Array of destination(s) to redirect
1396          * @param $appendSubtitle Boolean [optional]
1397          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1398          */
1399         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1400                 global $wgOut, $wgContLang, $wgStylePath, $wgUser;
1401                 # Display redirect
1402                 if ( !is_array( $target ) ) {
1403                         $target = array( $target );
1404                 }
1405                 $imageDir = $wgContLang->getDir();
1406                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1407                 $imageUrl2 = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1408                 $alt2 = $wgContLang->isRTL() ? '&larr;' : '&rarr;'; // should -> and <- be used instead of entities?
1409
1410                 if ( $appendSubtitle ) {
1411                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1412                 }
1413                 $sk = $wgUser->getSkin();
1414                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1415                 $title = array_shift( $target );
1416                 if ( $forceKnown ) {
1417                         $link = $sk->link(
1418                                 $title,
1419                                 htmlspecialchars( $title->getFullText() ),
1420                                 array(),
1421                                 array(),
1422                                 array( 'known', 'noclasses' )
1423                         );
1424                 } else {
1425                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1426                 }
1427                 // automatically append redirect=no to each link, since most of them are redirect pages themselves
1428                 foreach ( $target as $rt ) {
1429                         if ( $forceKnown ) {
1430                                 $link .= '<img src="' . $imageUrl2 . '" alt="' . $alt2 . ' " />'
1431                                         . $sk->link(
1432                                                 $rt,
1433                                                 htmlspecialchars( $rt->getFullText() ),
1434                                                 array(),
1435                                                 array(),
1436                                                 array( 'known', 'noclasses' )
1437                                         );
1438                         } else {
1439                                 $link .= '<img src="' . $imageUrl2 . '" alt="' . $alt2 . ' " />'
1440                                         . $sk->link( $rt, htmlspecialchars( $rt->getFullText() ) );
1441                         }
1442                 }
1443                 return '<img src="' . $imageUrl . '" alt="#REDIRECT " />' .
1444                         '<span class="redirectText">' . $link . '</span>';
1445
1446         }
1447
1448         public function addTrackbacks() {
1449                 global $wgOut, $wgUser;
1450                 $dbr = wfGetDB( DB_SLAVE );
1451                 $tbs = $dbr->select( 'trackbacks',
1452                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1453                         array( 'tb_page' => $this->getID() )
1454                 );
1455                 if ( !$dbr->numRows( $tbs ) ) return;
1456
1457                 $tbtext = "";
1458                 while ( $o = $dbr->fetchObject( $tbs ) ) {
1459                         $rmvtxt = "";
1460                         if ( $wgUser->isAllowed( 'trackback' ) ) {
1461                                 $delurl = $this->mTitle->getFullURL( "action=deletetrackback&tbid=" .
1462                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1463                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1464                         }
1465                         $tbtext .= "\n";
1466                         $tbtext .= wfMsg( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1467                                         $o->tb_title,
1468                                         $o->tb_url,
1469                                         $o->tb_ex,
1470                                         $o->tb_name,
1471                                         $rmvtxt );
1472                 }
1473                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>$1</div>\n", array( 'trackbackbox', $tbtext ) );
1474                 $this->mTitle->invalidateCache();
1475         }
1476
1477         public function deletetrackback() {
1478                 global $wgUser, $wgRequest, $wgOut;
1479                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
1480                         $wgOut->addWikiMsg( 'sessionfailure' );
1481                         return;
1482                 }
1483
1484                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1485                 if ( count( $permission_errors ) ) {
1486                         $wgOut->showPermissionsErrorPage( $permission_errors );
1487                         return;
1488                 }
1489
1490                 $db = wfGetDB( DB_MASTER );
1491                 $db->delete( 'trackbacks', array( 'tb_id' => $wgRequest->getInt( 'tbid' ) ) );
1492
1493                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1494                 $this->mTitle->invalidateCache();
1495         }
1496
1497         public function render() {
1498                 global $wgOut;
1499                 $wgOut->setArticleBodyOnly( true );
1500                 $this->view();
1501         }
1502
1503         /**
1504          * Handle action=purge
1505          */
1506         public function purge() {
1507                 global $wgUser, $wgRequest, $wgOut;
1508                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1509                         if ( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1510                                 $this->doPurge();
1511                                 $this->view();
1512                         }
1513                 } else {
1514                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1515                         $button = wfMsgExt( 'confirm_purge_button', array( 'escapenoentities' ) );
1516                         $form = "<form method=\"post\" action=\"$action\">\n" .
1517                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1518                                         "</form>\n";
1519                         $top = wfMsgExt( 'confirm-purge-top', array( 'parse' ) );
1520                         $bottom = wfMsgExt( 'confirm-purge-bottom', array( 'parse' ) );
1521                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1522                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1523                         $wgOut->addHTML( $top . $form . $bottom );
1524                 }
1525         }
1526
1527         /**
1528          * Perform the actions of a page purging
1529          */
1530         public function doPurge() {
1531                 global $wgUseSquid;
1532                 // Invalidate the cache
1533                 $this->mTitle->invalidateCache();
1534
1535                 if ( $wgUseSquid ) {
1536                         // Commit the transaction before the purge is sent
1537                         $dbw = wfGetDB( DB_MASTER );
1538                         $dbw->commit();
1539
1540                         // Send purge
1541                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1542                         $update->doUpdate();
1543                 }
1544                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1545                         global $wgMessageCache;
1546                         if ( $this->getID() == 0 ) {
1547                                 $text = false;
1548                         } else {
1549                                 $text = $this->getRawText();
1550                         }
1551                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1552                 }
1553         }
1554
1555         /**
1556          * Insert a new empty page record for this article.
1557          * This *must* be followed up by creating a revision
1558          * and running $this->updateToLatest( $rev_id );
1559          * or else the record will be left in a funky state.
1560          * Best if all done inside a transaction.
1561          *
1562          * @param $dbw Database
1563          * @return int The newly created page_id key, or false if the title already existed
1564          * @private
1565          */
1566         public function insertOn( $dbw ) {
1567                 wfProfileIn( __METHOD__ );
1568
1569                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1570                 $dbw->insert( 'page', array(
1571                         'page_id'           => $page_id,
1572                         'page_namespace'    => $this->mTitle->getNamespace(),
1573                         'page_title'        => $this->mTitle->getDBkey(),
1574                         'page_counter'      => 0,
1575                         'page_restrictions' => '',
1576                         'page_is_redirect'  => 0, # Will set this shortly...
1577                         'page_is_new'       => 1,
1578                         'page_random'       => wfRandom(),
1579                         'page_touched'      => $dbw->timestamp(),
1580                         'page_latest'       => 0, # Fill this in shortly...
1581                         'page_len'          => 0, # Fill this in shortly...
1582                 ), __METHOD__, 'IGNORE' );
1583
1584                 $affected = $dbw->affectedRows();
1585                 if ( $affected ) {
1586                         $newid = $dbw->insertId();
1587                         $this->mTitle->resetArticleId( $newid );
1588                 }
1589                 wfProfileOut( __METHOD__ );
1590                 return $affected ? $newid : false;
1591         }
1592
1593         /**
1594          * Update the page record to point to a newly saved revision.
1595          *
1596          * @param $dbw Database object
1597          * @param $revision Revision: For ID number, and text used to set
1598                             length and redirect status fields
1599          * @param $lastRevision Integer: if given, will not overwrite the page field
1600          *                      when different from the currently set value.
1601          *                      Giving 0 indicates the new page flag should be set
1602          *                      on.
1603          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1604          *                           removing rows in redirect table.
1605          * @return bool true on success, false on failure
1606          * @private
1607          */
1608         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1609                 wfProfileIn( __METHOD__ );
1610
1611                 $text = $revision->getText();
1612                 $rt = Title::newFromRedirect( $text );
1613
1614                 $conditions = array( 'page_id' => $this->getId() );
1615                 if ( !is_null( $lastRevision ) ) {
1616                         # An extra check against threads stepping on each other
1617                         $conditions['page_latest'] = $lastRevision;
1618                 }
1619
1620                 $dbw->update( 'page',
1621                         array( /* SET */
1622                                 'page_latest'      => $revision->getId(),
1623                                 'page_touched'     => $dbw->timestamp(),
1624                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1625                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1626                                 'page_len'         => strlen( $text ),
1627                         ),
1628                         $conditions,
1629                         __METHOD__ );
1630
1631                 $result = $dbw->affectedRows() != 0;
1632                 if ( $result ) {
1633                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1634                 }
1635
1636                 wfProfileOut( __METHOD__ );
1637                 return $result;
1638         }
1639
1640         /**
1641          * Add row to the redirect table if this is a redirect, remove otherwise.
1642          *
1643          * @param $dbw Database
1644          * @param $redirectTitle a title object pointing to the redirect target,
1645          *                       or NULL if this is not a redirect
1646          * @param $lastRevIsRedirect If given, will optimize adding and
1647          *                           removing rows in redirect table.
1648          * @return bool true on success, false on failure
1649          * @private
1650          */
1651         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1652                 // Always update redirects (target link might have changed)
1653                 // Update/Insert if we don't know if the last revision was a redirect or not
1654                 // Delete if changing from redirect to non-redirect
1655                 $isRedirect = !is_null( $redirectTitle );
1656                 if ( $isRedirect || is_null( $lastRevIsRedirect ) || $lastRevIsRedirect !== $isRedirect ) {
1657                         wfProfileIn( __METHOD__ );
1658                         if ( $isRedirect ) {
1659                                 // This title is a redirect, Add/Update row in the redirect table
1660                                 $set = array( /* SET */
1661                                         'rd_namespace' => $redirectTitle->getNamespace(),
1662                                         'rd_title'     => $redirectTitle->getDBkey(),
1663                                         'rd_from'      => $this->getId(),
1664                                 );
1665                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1666                         } else {
1667                                 // This is not a redirect, remove row from redirect table
1668                                 $where = array( 'rd_from' => $this->getId() );
1669                                 $dbw->delete( 'redirect', $where, __METHOD__ );
1670                         }
1671                         if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1672                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1673                         }
1674                         wfProfileOut( __METHOD__ );
1675                         return ( $dbw->affectedRows() != 0 );
1676                 }
1677                 return true;
1678         }
1679
1680         /**
1681          * If the given revision is newer than the currently set page_latest,
1682          * update the page record. Otherwise, do nothing.
1683          *
1684          * @param $dbw Database object
1685          * @param $revision Revision object
1686          */
1687         public function updateIfNewerOn( &$dbw, $revision ) {
1688                 wfProfileIn( __METHOD__ );
1689                 $row = $dbw->selectRow(
1690                         array( 'revision', 'page' ),
1691                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1692                         array(
1693                                 'page_id' => $this->getId(),
1694                                 'page_latest=rev_id' ),
1695                         __METHOD__ );
1696                 if ( $row ) {
1697                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1698                                 wfProfileOut( __METHOD__ );
1699                                 return false;
1700                         }
1701                         $prev = $row->rev_id;
1702                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1703                 } else {
1704                         # No or missing previous revision; mark the page as new
1705                         $prev = 0;
1706                         $lastRevIsRedirect = null;
1707                 }
1708                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1709                 wfProfileOut( __METHOD__ );
1710                 return $ret;
1711         }
1712
1713         /**
1714          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1715          * @return string Complete article text, or null if error
1716          */
1717         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1718                 wfProfileIn( __METHOD__ );
1719                 if ( strval( $section ) == '' ) {
1720                         // Whole-page edit; let the whole text through
1721                 } else {
1722                         if ( is_null( $edittime ) ) {
1723                                 $rev = Revision::newFromTitle( $this->mTitle );
1724                         } else {
1725                                 $dbw = wfGetDB( DB_MASTER );
1726                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1727                         }
1728                         if ( !$rev ) {
1729                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1730                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1731                                 return null;
1732                         }
1733                         $oldtext = $rev->getText();
1734
1735                         if ( $section == 'new' ) {
1736                                 # Inserting a new section
1737                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1738                                 $text = strlen( trim( $oldtext ) ) > 0
1739                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1740                                                 : "{$subject}{$text}";
1741                         } else {
1742                                 # Replacing an existing section; roll out the big guns
1743                                 global $wgParser;
1744                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1745                         }
1746                 }
1747                 wfProfileOut( __METHOD__ );
1748                 return $text;
1749         }
1750
1751         /**
1752          * This function is not deprecated until somebody fixes the core not to use
1753          * it. Nevertheless, use Article::doEdit() instead.
1754          */
1755         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC = false, $comment = false, $bot = false ) {
1756                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1757                         ( $isminor ? EDIT_MINOR : 0 ) |
1758                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1759                         ( $bot ? EDIT_FORCE_BOT : 0 );
1760
1761                 # If this is a comment, add the summary as headline
1762                 if ( $comment && $summary != "" ) {
1763                         $text = wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" . $text;
1764                 }
1765
1766                 $this->doEdit( $text, $summary, $flags );
1767
1768                 $dbw = wfGetDB( DB_MASTER );
1769                 if ( $watchthis ) {
1770                         if ( !$this->mTitle->userIsWatching() ) {
1771                                 $dbw->begin();
1772                                 $this->doWatch();
1773                                 $dbw->commit();
1774                         }
1775                 } else {
1776                         if ( $this->mTitle->userIsWatching() ) {
1777                                 $dbw->begin();
1778                                 $this->doUnwatch();
1779                                 $dbw->commit();
1780                         }
1781                 }
1782                 $this->doRedirect( $this->isRedirect( $text ) );
1783         }
1784
1785         /**
1786          * @deprecated use Article::doEdit()
1787          */
1788         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1789                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1790                         ( $minor ? EDIT_MINOR : 0 ) |
1791                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1792
1793                 $status = $this->doEdit( $text, $summary, $flags );
1794                 if ( !$status->isOK() ) {
1795                         return false;
1796                 }
1797
1798                 $dbw = wfGetDB( DB_MASTER );
1799                 if ( $watchthis ) {
1800                         if ( !$this->mTitle->userIsWatching() ) {
1801                                 $dbw->begin();
1802                                 $this->doWatch();
1803                                 $dbw->commit();
1804                         }
1805                 } else {
1806                         if ( $this->mTitle->userIsWatching() ) {
1807                                 $dbw->begin();
1808                                 $this->doUnwatch();
1809                                 $dbw->commit();
1810                         }
1811                 }
1812
1813                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1814                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1815
1816                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1817                 return true;
1818         }
1819
1820         /**
1821          * Article::doEdit()
1822          *
1823          * Change an existing article or create a new article. Updates RC and all necessary caches,
1824          * optionally via the deferred update array.
1825          *
1826          * $wgUser must be set before calling this function.
1827          *
1828          * @param $text String: new text
1829          * @param $summary String: edit summary
1830          * @param $flags Integer bitfield:
1831          *      EDIT_NEW
1832          *          Article is known or assumed to be non-existent, create a new one
1833          *      EDIT_UPDATE
1834          *          Article is known or assumed to be pre-existing, update it
1835          *      EDIT_MINOR
1836          *          Mark this edit minor, if the user is allowed to do so
1837          *      EDIT_SUPPRESS_RC
1838          *          Do not log the change in recentchanges
1839          *      EDIT_FORCE_BOT
1840          *          Mark the edit a "bot" edit regardless of user rights
1841          *      EDIT_DEFER_UPDATES
1842          *          Defer some of the updates until the end of index.php
1843          *      EDIT_AUTOSUMMARY
1844          *          Fill in blank summaries with generated text where possible
1845          *
1846          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1847          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1848          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1849          * edit-already-exists error will be returned. These two conditions are also possible with
1850          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1851          *
1852          * @param $baseRevId the revision ID this edit was based off, if any
1853          * @param $user Optional user object, $wgUser will be used if not passed
1854          *
1855          * @return Status object. Possible errors:
1856          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1857          *     edit-gone-missing:       In update mode, but the article didn't exist
1858          *     edit-conflict:           In update mode, the article changed unexpectedly
1859          *     edit-no-change:          Warning that the text was the same as before
1860          *     edit-already-exists:     In creation mode, but the article already exists
1861          *
1862          *  Extensions may define additional errors.
1863          *
1864          *  $return->value will contain an associative array with members as follows:
1865          *     new:                     Boolean indicating if the function attempted to create a new article
1866          *     revision:                The revision object for the inserted revision, or null
1867          *
1868          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1869          */
1870         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1871                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1872
1873                 # Low-level sanity check
1874                 if ( $this->mTitle->getText() == '' ) {
1875                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1876                 }
1877
1878                 wfProfileIn( __METHOD__ );
1879
1880                 $user = is_null( $user ) ? $wgUser : $user;
1881                 $status = Status::newGood( array() );
1882
1883                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1884                 $this->loadPageData();
1885
1886                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1887                         $aid = $this->mTitle->getArticleID();
1888                         if ( $aid ) {
1889                                 $flags |= EDIT_UPDATE;
1890                         } else {
1891                                 $flags |= EDIT_NEW;
1892                         }
1893                 }
1894
1895                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1896                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1897                 {
1898                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1899                         wfProfileOut( __METHOD__ );
1900                         if ( $status->isOK() ) {
1901                                 $status->fatal( 'edit-hook-aborted' );
1902                         }
1903                         return $status;
1904                 }
1905
1906                 # Silently ignore EDIT_MINOR if not allowed
1907                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1908                 $bot = $flags & EDIT_FORCE_BOT;
1909
1910                 $oldtext = $this->getRawText(); // current revision
1911                 $oldsize = strlen( $oldtext );
1912
1913                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1914                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1915                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1916                 }
1917
1918                 $editInfo = $this->prepareTextForEdit( $text );
1919                 $text = $editInfo->pst;
1920                 $newsize = strlen( $text );
1921
1922                 $dbw = wfGetDB( DB_MASTER );
1923                 $now = wfTimestampNow();
1924                 $this->mTimestamp = $now;
1925
1926                 if ( $flags & EDIT_UPDATE ) {
1927                         # Update article, but only if changed.
1928                         $status->value['new'] = false;
1929                         # Make sure the revision is either completely inserted or not inserted at all
1930                         if ( !$wgDBtransactions ) {
1931                                 $userAbort = ignore_user_abort( true );
1932                         }
1933
1934                         $revisionId = 0;
1935
1936                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1937
1938                         if ( $changed ) {
1939                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1940                                   - (int)$this->isCountable( $oldtext );
1941                                 $this->mTotalAdjustment = 0;
1942
1943                                 if ( !$this->mLatest ) {
1944                                         # Article gone missing
1945                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1946                                         $status->fatal( 'edit-gone-missing' );
1947                                         wfProfileOut( __METHOD__ );
1948                                         return $status;
1949                                 }
1950
1951                                 $revision = new Revision( array(
1952                                         'page'       => $this->getId(),
1953                                         'comment'    => $summary,
1954                                         'minor_edit' => $isminor,
1955                                         'text'       => $text,
1956                                         'parent_id'  => $this->mLatest,
1957                                         'user'       => $user->getId(),
1958                                         'user_text'  => $user->getName(),
1959                                         ) );
1960
1961                                 $dbw->begin();
1962                                 $revisionId = $revision->insertOn( $dbw );
1963
1964                                 # Update page
1965                                 #
1966                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1967                                 # during the course of this function. This makes sure that EditPage can detect
1968                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1969                                 # before this function is called. A previous function used a separate query, this
1970                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1971                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1972
1973                                 if ( !$ok ) {
1974                                         /* Belated edit conflict! Run away!! */
1975                                         $status->fatal( 'edit-conflict' );
1976                                         # Delete the invalid revision if the DB is not transactional
1977                                         if ( !$wgDBtransactions ) {
1978                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1979                                         }
1980                                         $revisionId = 0;
1981                                         $dbw->rollback();
1982                                 } else {
1983                                         global $wgUseRCPatrol;
1984                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1985                                         # Update recentchanges
1986                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1987                                                 # Mark as patrolled if the user can do so
1988                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan( 'autopatrol' );
1989                                                 # Add RC row to the DB
1990                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1991                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1992                                                         $revisionId, $patrolled
1993                                                 );
1994                                                 # Log auto-patrolled edits
1995                                                 if ( $patrolled ) {
1996                                                         PatrolLog::record( $rc, true );
1997                                                 }
1998                                         }
1999                                         $user->incEditCount();
2000                                         $dbw->commit();
2001                                 }
2002                         } else {
2003                                 $status->warning( 'edit-no-change' );
2004                                 $revision = null;
2005                                 // Keep the same revision ID, but do some updates on it
2006                                 $revisionId = $this->getRevIdFetched();
2007                                 // Update page_touched, this is usually implicit in the page update
2008                                 // Other cache updates are done in onArticleEdit()
2009                                 $this->mTitle->invalidateCache();
2010                         }
2011
2012                         if ( !$wgDBtransactions ) {
2013                                 ignore_user_abort( $userAbort );
2014                         }
2015                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2016                         if ( !$status->isOK() ) {
2017                                 wfProfileOut( __METHOD__ );
2018                                 return $status;
2019                         }
2020
2021                         # Invalidate cache of this article and all pages using this article
2022                         # as a template. Partly deferred.
2023                         Article::onArticleEdit( $this->mTitle );
2024                         # Update links tables, site stats, etc.
2025                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
2026                 } else {
2027                         # Create new article
2028                         $status->value['new'] = true;
2029
2030                         # Set statistics members
2031                         # We work out if it's countable after PST to avoid counter drift
2032                         # when articles are created with {{subst:}}
2033                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2034                         $this->mTotalAdjustment = 1;
2035
2036                         $dbw->begin();
2037
2038                         # Add the page record; stake our claim on this title!
2039                         # This will return false if the article already exists
2040                         $newid = $this->insertOn( $dbw );
2041
2042                         if ( $newid === false ) {
2043                                 $dbw->rollback();
2044                                 $status->fatal( 'edit-already-exists' );
2045                                 wfProfileOut( __METHOD__ );
2046                                 return $status;
2047                         }
2048
2049                         # Save the revision text...
2050                         $revision = new Revision( array(
2051                                 'page'       => $newid,
2052                                 'comment'    => $summary,
2053                                 'minor_edit' => $isminor,
2054                                 'text'       => $text,
2055                                 'user'       => $user->getId(),
2056                                 'user_text'  => $user->getName(),
2057                                 ) );
2058                         $revisionId = $revision->insertOn( $dbw );
2059
2060                         $this->mTitle->resetArticleID( $newid );
2061
2062                         # Update the page record with revision data
2063                         $this->updateRevisionOn( $dbw, $revision, 0 );
2064
2065                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2066                         # Update recentchanges
2067                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2068                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2069                                 # Mark as patrolled if the user can do so
2070                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && $this->mTitle->userCan( 'autopatrol' );
2071                                 # Add RC row to the DB
2072                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2073                                         '', strlen( $text ), $revisionId, $patrolled );
2074                                 # Log auto-patrolled edits
2075                                 if ( $patrolled ) {
2076                                         PatrolLog::record( $rc, true );
2077                                 }
2078                         }
2079                         $user->incEditCount();
2080                         $dbw->commit();
2081
2082                         # Update links, etc.
2083                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
2084
2085                         # Clear caches
2086                         Article::onArticleCreate( $this->mTitle );
2087
2088                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2089                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
2090                 }
2091
2092                 # Do updates right now unless deferral was requested
2093                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2094                         wfDoUpdates();
2095                 }
2096
2097                 // Return the new revision (or null) to the caller
2098                 $status->value['revision'] = $revision;
2099
2100                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2101                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
2102
2103                 wfProfileOut( __METHOD__ );
2104                 return $status;
2105         }
2106
2107         /**
2108          * @deprecated wrapper for doRedirect
2109          */
2110         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
2111                 wfDeprecated( __METHOD__ );
2112                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
2113         }
2114
2115         /**
2116          * Output a redirect back to the article.
2117          * This is typically used after an edit.
2118          *
2119          * @param $noRedir Boolean: add redirect=no
2120          * @param $sectionAnchor String: section to redirect to, including "#"
2121          * @param $extraQuery String: extra query params
2122          */
2123         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2124                 global $wgOut;
2125                 if ( $noRedir ) {
2126                         $query = 'redirect=no';
2127                         if ( $extraQuery )
2128                                 $query .= "&$query";
2129                 } else {
2130                         $query = $extraQuery;
2131                 }
2132                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2133         }
2134
2135         /**
2136          * Mark this particular edit/page as patrolled
2137          */
2138         public function markpatrolled() {
2139                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
2140                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2141
2142                 # If we haven't been given an rc_id value, we can't do anything
2143                 $rcid = (int) $wgRequest->getVal( 'rcid' );
2144                 $rc = RecentChange::newFromId( $rcid );
2145                 if ( is_null( $rc ) ) {
2146                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2147                         return;
2148                 }
2149
2150                 # It would be nice to see where the user had actually come from, but for now just guess
2151                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2152                 $return = SpecialPage::getTitleFor( $returnto );
2153
2154                 $dbw = wfGetDB( DB_MASTER );
2155                 $errors = $rc->doMarkPatrolled();
2156
2157                 if ( in_array( array( 'rcpatroldisabled' ), $errors ) ) {
2158                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2159                         return;
2160                 }
2161
2162                 if ( in_array( array( 'hookaborted' ), $errors ) ) {
2163                         // The hook itself has handled any output
2164                         return;
2165                 }
2166
2167                 if ( in_array( array( 'markedaspatrollederror-noautopatrol' ), $errors ) ) {
2168                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2169                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2170                         $wgOut->returnToMain( false, $return );
2171                         return;
2172                 }
2173
2174                 if ( !empty( $errors ) ) {
2175                         $wgOut->showPermissionsErrorPage( $errors );
2176                         return;
2177                 }
2178
2179                 # Inform the user
2180                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2181                 $wgOut->addWikiMsg( 'markedaspatrolledtext', $rc->getTitle()->getPrefixedText() );
2182                 $wgOut->returnToMain( false, $return );
2183         }
2184
2185         /**
2186          * User-interface handler for the "watch" action
2187          */
2188         public function watch() {
2189                 global $wgUser, $wgOut;
2190                 if ( $wgUser->isAnon() ) {
2191                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2192                         return;
2193                 }
2194                 if ( wfReadOnly() ) {
2195                         $wgOut->readOnlyPage();
2196                         return;
2197                 }
2198                 if ( $this->doWatch() ) {
2199                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
2200                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2201                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
2202                 }
2203                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2204         }
2205
2206         /**
2207          * Add this page to $wgUser's watchlist
2208          * @return bool true on successful watch operation
2209          */
2210         public function doWatch() {
2211                 global $wgUser;
2212                 if ( $wgUser->isAnon() ) {
2213                         return false;
2214                 }
2215                 if ( wfRunHooks( 'WatchArticle', array( &$wgUser, &$this ) ) ) {
2216                         $wgUser->addWatch( $this->mTitle );
2217                         return wfRunHooks( 'WatchArticleComplete', array( &$wgUser, &$this ) );
2218                 }
2219                 return false;
2220         }
2221
2222         /**
2223          * User interface handler for the "unwatch" action.
2224          */
2225         public function unwatch() {
2226                 global $wgUser, $wgOut;
2227                 if ( $wgUser->isAnon() ) {
2228                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2229                         return;
2230                 }
2231                 if ( wfReadOnly() ) {
2232                         $wgOut->readOnlyPage();
2233                         return;
2234                 }
2235                 if ( $this->doUnwatch() ) {
2236                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
2237                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2238                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
2239                 }
2240                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2241         }
2242
2243         /**
2244          * Stop watching a page
2245          * @return bool true on successful unwatch
2246          */
2247         public function doUnwatch() {
2248                 global $wgUser;
2249                 if ( $wgUser->isAnon() ) {
2250                         return false;
2251                 }
2252                 if ( wfRunHooks( 'UnwatchArticle', array( &$wgUser, &$this ) ) ) {
2253                         $wgUser->removeWatch( $this->mTitle );
2254                         return wfRunHooks( 'UnwatchArticleComplete', array( &$wgUser, &$this ) );
2255                 }
2256                 return false;
2257         }
2258
2259         /**
2260          * action=protect handler
2261          */
2262         public function protect() {
2263                 $form = new ProtectionForm( $this );
2264                 $form->execute();
2265         }
2266
2267         /**
2268          * action=unprotect handler (alias)
2269          */
2270         public function unprotect() {
2271                 $this->protect();
2272         }
2273
2274         /**
2275          * Update the article's restriction field, and leave a log entry.
2276          *
2277          * @param $limit Array: set of restriction keys
2278          * @param $reason String
2279          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2280          * @param $expiry Array: per restriction type expiration
2281          * @return bool true on success
2282          */
2283         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2284                 global $wgUser, $wgContLang;
2285
2286                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2287
2288                 $id = $this->mTitle->getArticleID();
2289                 if ( $id <= 0 ) {
2290                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
2291                         return false;
2292                 }
2293
2294                 if ( wfReadOnly() ) {
2295                         wfDebug( "updateRestrictions failed: read-only\n" );
2296                         return false;
2297                 }
2298
2299                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2300                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2301                         return false;
2302                 }
2303
2304                 if ( !$cascade ) {
2305                         $cascade = false;
2306                 }
2307
2308                 // Take this opportunity to purge out expired restrictions
2309                 Title::purgeExpiredRestrictions();
2310
2311                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2312                 # we expect a single selection, but the schema allows otherwise.
2313                 $current = array();
2314                 $updated = Article::flattenRestrictions( $limit );
2315                 $changed = false;
2316                 foreach ( $restrictionTypes as $action ) {
2317                         if ( isset( $expiry[$action] ) ) {
2318                                 # Get current restrictions on $action
2319                                 $aLimits = $this->mTitle->getRestrictions( $action );
2320                                 $current[$action] = implode( '', $aLimits );
2321                                 # Are any actual restrictions being dealt with here?
2322                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
2323                                 # If something changed, we need to log it. Checking $aRChanged
2324                                 # assures that "unprotecting" a page that is not protected does
2325                                 # not log just because the expiry was "changed".
2326                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2327                                         $changed = true;
2328                                 }
2329                         }
2330                 }
2331
2332                 $current = Article::flattenRestrictions( $current );
2333
2334                 $changed = ( $changed || $current != $updated );
2335                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
2336                 $protect = ( $updated != '' );
2337
2338                 # If nothing's changed, do nothing
2339                 if ( $changed ) {
2340                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2341
2342                                 $dbw = wfGetDB( DB_MASTER );
2343
2344                                 # Prepare a null revision to be added to the history
2345                                 $modified = $current != '' && $protect;
2346                                 if ( $protect ) {
2347                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2348                                 } else {
2349                                         $comment_type = 'unprotectedarticle';
2350                                 }
2351                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2352
2353                                 # Only restrictions with the 'protect' right can cascade...
2354                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2355                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2356                                 # The schema allows multiple restrictions
2357                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) )
2358                                         $cascade = false;
2359                                 $cascade_description = '';
2360                                 if ( $cascade ) {
2361                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2362                                 }
2363
2364                                 if ( $reason )
2365                                         $comment .= ": $reason";
2366
2367                                 $editComment = $comment;
2368                                 $encodedExpiry = array();
2369                                 $protect_description = '';
2370                                 foreach ( $limit as $action => $restrictions  ) {
2371                                         if ( !isset( $expiry[$action] ) )
2372                                                 $expiry[$action] = 'infinite';
2373
2374                                         $encodedExpiry[$action] = Block::encodeExpiry( $expiry[$action], $dbw );
2375                                         if ( $restrictions != '' ) {
2376                                                 $protect_description .= "[$action=$restrictions] (";
2377                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2378                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2379                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2380                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2381                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2382                                                 } else {
2383                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2384                                                 }
2385                                                 $protect_description .= ') ';
2386                                         }
2387                                 }
2388                                 $protect_description = trim( $protect_description );
2389
2390                                 if ( $protect_description && $protect )
2391                                         $editComment .= " ($protect_description)";
2392                                 if ( $cascade )
2393                                         $editComment .= "$cascade_description";
2394                                 # Update restrictions table
2395                                 foreach ( $limit as $action => $restrictions ) {
2396                                         if ( $restrictions != '' ) {
2397                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2398                                                         array( 'pr_page' => $id,
2399                                                                 'pr_type' => $action,
2400                                                                 'pr_level' => $restrictions,
2401                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2402                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
2403                                         } else {
2404                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2405                                                         'pr_type' => $action ), __METHOD__ );
2406                                         }
2407                                 }
2408
2409                                 # Insert a null revision
2410                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2411                                 $nullRevId = $nullRevision->insertOn( $dbw );
2412
2413                                 $latest = $this->getLatest();
2414                                 # Update page record
2415                                 $dbw->update( 'page',
2416                                         array( /* SET */
2417                                                 'page_touched' => $dbw->timestamp(),
2418                                                 'page_restrictions' => '',
2419                                                 'page_latest' => $nullRevId
2420                                         ), array( /* WHERE */
2421                                                 'page_id' => $id
2422                                         ), 'Article::protect'
2423                                 );
2424
2425                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
2426                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2427
2428                                 # Update the protection log
2429                                 $log = new LogPage( 'protect' );
2430                                 if ( $protect ) {
2431                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
2432                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
2433                                 } else {
2434                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2435                                 }
2436
2437                         } # End hook
2438                 } # End "changed" check
2439
2440                 return true;
2441         }
2442
2443         /**
2444          * Take an array of page restrictions and flatten it to a string
2445          * suitable for insertion into the page_restrictions field.
2446          * @param $limit Array
2447          * @return String
2448          */
2449         protected static function flattenRestrictions( $limit ) {
2450                 if ( !is_array( $limit ) ) {
2451                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2452                 }
2453                 $bits = array();
2454                 ksort( $limit );
2455                 foreach ( $limit as $action => $restrictions ) {
2456                         if ( $restrictions != '' ) {
2457                                 $bits[] = "$action=$restrictions";
2458                         }
2459                 }
2460                 return implode( ':', $bits );
2461         }
2462
2463         /**
2464          * Auto-generates a deletion reason
2465          * @param &$hasHistory Boolean: whether the page has a history
2466          */
2467         public function generateReason( &$hasHistory ) {
2468                 global $wgContLang;
2469                 $dbw = wfGetDB( DB_MASTER );
2470                 // Get the last revision
2471                 $rev = Revision::newFromTitle( $this->mTitle );
2472                 if ( is_null( $rev ) )
2473                         return false;
2474
2475                 // Get the article's contents
2476                 $contents = $rev->getText();
2477                 $blank = false;
2478                 // If the page is blank, use the text from the previous revision,
2479                 // which can only be blank if there's a move/import/protect dummy revision involved
2480                 if ( $contents == '' ) {
2481                         $prev = $rev->getPrevious();
2482                         if ( $prev )    {
2483                                 $contents = $prev->getText();
2484                                 $blank = true;
2485                         }
2486                 }
2487
2488                 // Find out if there was only one contributor
2489                 // Only scan the last 20 revisions
2490                 $res = $dbw->select( 'revision', 'rev_user_text',
2491                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2492                         __METHOD__,
2493                         array( 'LIMIT' => 20 )
2494                 );
2495                 if ( $res === false )
2496                         // This page has no revisions, which is very weird
2497                         return false;
2498
2499                 $hasHistory = ( $res->numRows() > 1 );
2500                 $row = $dbw->fetchObject( $res );
2501                 $onlyAuthor = $row->rev_user_text;
2502                 // Try to find a second contributor
2503                 foreach ( $res as $row ) {
2504                         if ( $row->rev_user_text != $onlyAuthor ) {
2505                                 $onlyAuthor = false;
2506                                 break;
2507                         }
2508                 }
2509                 $dbw->freeResult( $res );
2510
2511                 // Generate the summary with a '$1' placeholder
2512                 if ( $blank ) {
2513                         // The current revision is blank and the one before is also
2514                         // blank. It's just not our lucky day
2515                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2516                 } else {
2517                         if ( $onlyAuthor )
2518                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2519                         else
2520                                 $reason = wfMsgForContent( 'excontent', '$1' );
2521                 }
2522
2523                 if ( $reason == '-' ) {
2524                         // Allow these UI messages to be blanked out cleanly
2525                         return '';
2526                 }
2527
2528                 // Replace newlines with spaces to prevent uglyness
2529                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2530                 // Calculate the maximum amount of chars to get
2531                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2532                 $maxLength = 255 - ( strlen( $reason ) - 2 ) - 3;
2533                 $contents = $wgContLang->truncate( $contents, $maxLength );
2534                 // Remove possible unfinished links
2535                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2536                 // Now replace the '$1' placeholder
2537                 $reason = str_replace( '$1', $contents, $reason );
2538                 return $reason;
2539         }
2540
2541
2542         /*
2543          * UI entry point for page deletion
2544          */
2545         public function delete() {
2546                 global $wgUser, $wgOut, $wgRequest;
2547
2548                 $confirm = $wgRequest->wasPosted() &&
2549                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2550
2551                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2552                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2553
2554                 $reason = $this->DeleteReasonList;
2555
2556                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
2557                         // Entry from drop down menu + additional comment
2558                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2559                 } elseif ( $reason == 'other' ) {
2560                         $reason = $this->DeleteReason;
2561                 }
2562                 # Flag to hide all contents of the archived revisions
2563                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2564
2565                 # This code desperately needs to be totally rewritten
2566
2567                 # Read-only check...
2568                 if ( wfReadOnly() ) {
2569                         $wgOut->readOnlyPage();
2570                         return;
2571                 }
2572
2573                 # Check permissions
2574                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2575
2576                 if ( count( $permission_errors ) > 0 ) {
2577                         $wgOut->showPermissionsErrorPage( $permission_errors );
2578                         return;
2579                 }
2580
2581                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2582
2583                 # Better double-check that it hasn't been deleted yet!
2584                 $dbw = wfGetDB( DB_MASTER );
2585                 $conds = $this->mTitle->pageCond();
2586                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2587                 if ( $latest === false ) {
2588                         $wgOut->showFatalError(
2589                                 Html::rawElement(
2590                                         'div',
2591                                         array( 'class' => 'error mw-error-cannotdelete' ),
2592                                         wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2593                                 )
2594                         );
2595                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2596                         LogEventsList::showLogExtract(
2597                                 $wgOut,
2598                                 'delete',
2599                                 $this->mTitle->getPrefixedText()
2600                         );
2601                         return;
2602                 }
2603
2604                 # Hack for big sites
2605                 $bigHistory = $this->isBigDeletion();
2606                 if ( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2607                         global $wgLang, $wgDeleteRevisionsLimit;
2608                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2609                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2610                         return;
2611                 }
2612
2613                 if ( $confirm ) {
2614                         $this->doDelete( $reason, $suppress );
2615                         if ( $wgRequest->getCheck( 'wpWatch' ) && $wgUser->isLoggedIn() ) {
2616                                 $this->doWatch();
2617                         } elseif ( $this->mTitle->userIsWatching() ) {
2618                                 $this->doUnwatch();
2619                         }
2620                         return;
2621                 }
2622
2623                 // Generate deletion reason
2624                 $hasHistory = false;
2625                 if ( !$reason ) $reason = $this->generateReason( $hasHistory );
2626
2627                 // If the page has a history, insert a warning
2628                 if ( $hasHistory && !$confirm ) {
2629                         global $wgLang;
2630                         $skin = $wgUser->getSkin();
2631                         $revisions = $this->estimateRevisionCount();
2632                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
2633                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
2634                                 wfMsgHtml( 'word-separator' ) . $skin->historyLink() .
2635                                 '</strong>'
2636                         );
2637                         if ( $bigHistory ) {
2638                                 global $wgDeleteRevisionsLimit;
2639                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2640                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2641                         }
2642                 }
2643
2644                 return $this->confirmDelete( $reason );
2645         }
2646
2647         /**
2648          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2649          */
2650         public function isBigDeletion() {
2651                 global $wgDeleteRevisionsLimit;
2652                 if ( $wgDeleteRevisionsLimit ) {
2653                         $revCount = $this->estimateRevisionCount();
2654                         return $revCount > $wgDeleteRevisionsLimit;
2655                 }
2656                 return false;
2657         }
2658
2659         /**
2660          * @return int approximate revision count
2661          */
2662         public function estimateRevisionCount() {
2663                 $dbr = wfGetDB( DB_SLAVE );
2664                 // For an exact count...
2665                 // return $dbr->selectField( 'revision', 'COUNT(*)',
2666                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2667                 return $dbr->estimateRowCount( 'revision', '*',
2668                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2669         }
2670
2671         /**
2672          * Get the last N authors
2673          * @param $num Integer: number of revisions to get
2674          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2675          * @return array Array of authors, duplicates not removed
2676          */
2677         public function getLastNAuthors( $num, $revLatest = 0 ) {
2678                 wfProfileIn( __METHOD__ );
2679                 // First try the slave
2680                 // If that doesn't have the latest revision, try the master
2681                 $continue = 2;
2682                 $db = wfGetDB( DB_SLAVE );
2683                 do {
2684                         $res = $db->select( array( 'page', 'revision' ),
2685                                 array( 'rev_id', 'rev_user_text' ),
2686                                 array(
2687                                         'page_namespace' => $this->mTitle->getNamespace(),
2688                                         'page_title' => $this->mTitle->getDBkey(),
2689                                         'rev_page = page_id'
2690                                 ), __METHOD__, $this->getSelectOptions( array(
2691                                         'ORDER BY' => 'rev_timestamp DESC',
2692                                         'LIMIT' => $num
2693                                 ) )
2694                         );
2695                         if ( !$res ) {
2696                                 wfProfileOut( __METHOD__ );
2697                                 return array();
2698                         }
2699                         $row = $db->fetchObject( $res );
2700                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2701                                 $db = wfGetDB( DB_MASTER );
2702                                 $continue--;
2703                         } else {
2704                                 $continue = 0;
2705                         }
2706                 } while ( $continue );
2707
2708                 $authors = array( $row->rev_user_text );
2709                 while ( $row = $db->fetchObject( $res ) ) {
2710                         $authors[] = $row->rev_user_text;
2711                 }
2712                 wfProfileOut( __METHOD__ );
2713                 return $authors;
2714         }
2715
2716         /**
2717          * Output deletion confirmation dialog
2718          * @param $reason String: prefilled reason
2719          */
2720         public function confirmDelete( $reason ) {
2721                 global $wgOut, $wgUser;
2722
2723                 wfDebug( "Article::confirmDelete\n" );
2724
2725                 $deleteBackLink = $wgUser->getSkin()->link(
2726                         $this->mTitle,
2727                         null,
2728                         array(),
2729                         array(),
2730                         array( 'known', 'noclasses' )
2731                 );
2732                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
2733                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2734                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2735
2736                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
2737
2738                 if ( $wgUser->isAllowed( 'suppressrevision' ) ) {
2739                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2740                                         <td></td>
2741                                         <td class='mw-input'><strong>" .
2742                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2743                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2744                                         "</strong></td>
2745                                 </tr>";
2746                 } else {
2747                         $suppress = '';
2748                 }
2749                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2750
2751                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2752                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2753                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2754                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2755                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2756                         "<tr id=\"wpDeleteReasonListRow\">
2757                                 <td class='mw-label'>" .
2758                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2759                                 "</td>
2760                                 <td class='mw-input'>" .
2761                                         Xml::listDropDown( 'wpDeleteReasonList',
2762                                                 wfMsgForContent( 'deletereason-dropdown' ),
2763                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2764                                 "</td>
2765                         </tr>
2766                         <tr id=\"wpDeleteReasonRow\">
2767                                 <td class='mw-label'>" .
2768                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2769                                 "</td>
2770                                 <td class='mw-input'>" .
2771                                 Html::input( 'wpReason', $reason, 'text', array(
2772                                         'size' => '60',
2773                                         'maxlength' => '255',
2774                                         'tabindex' => '2',
2775                                         'id' => 'wpReason',
2776                                         'autofocus'
2777                                 ) ) .
2778                                 "</td>
2779                         </tr>";
2780                 # Dissalow watching is user is not logged in
2781                 if ( $wgUser->isLoggedIn() ) {
2782                         $form .= "
2783                         <tr>
2784                                 <td></td>
2785                                 <td class='mw-input'>" .
2786                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2787                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2788                                 "</td>
2789                         </tr>";
2790                 }
2791                 $form .= "
2792                         $suppress
2793                         <tr>
2794                                 <td></td>
2795                                 <td class='mw-submit'>" .
2796                                         Xml::submitButton( wfMsg( 'deletepage' ),
2797                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2798                                 "</td>
2799                         </tr>" .
2800                         Xml::closeElement( 'table' ) .
2801                         Xml::closeElement( 'fieldset' ) .
2802                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2803                         Xml::closeElement( 'form' );
2804
2805                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
2806                                 $skin = $wgUser->getSkin();
2807                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
2808                                 $link = $skin->link(
2809                                         $title,
2810                                         wfMsgHtml( 'delete-edit-reasonlist' ),
2811                                         array(),
2812                                         array( 'action' => 'edit' )
2813                                 );
2814                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2815                         }
2816
2817                 $wgOut->addHTML( $form );
2818                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2819                 LogEventsList::showLogExtract(
2820                         $wgOut,
2821                         'delete',
2822                         $this->mTitle->getPrefixedText()
2823                 );
2824         }
2825
2826         /**
2827          * Perform a deletion and output success or failure messages
2828          */
2829         public function doDelete( $reason, $suppress = false ) {
2830                 global $wgOut, $wgUser;
2831                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2832
2833                 $error = '';
2834                 if ( wfRunHooks( 'ArticleDelete', array( &$this, &$wgUser, &$reason, &$error ) ) ) {
2835                         if ( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2836                                 $deleted = $this->mTitle->getPrefixedText();
2837
2838                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2839                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2840
2841                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2842
2843                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2844                                 $wgOut->returnToMain( false );
2845                                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$wgUser, $reason, $id ) );
2846                         }
2847                 } else {
2848                         if ( $error == '' ) {
2849                                 $wgOut->showFatalError(
2850                                         Html::rawElement(
2851                                                 'div',
2852                                                 array( 'class' => 'error mw-error-cannotdelete' ),
2853                                                 wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2854                                         )
2855                                 );
2856                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2857                                 LogEventsList::showLogExtract(
2858                                         $wgOut,
2859                                         'delete',
2860                                         $this->mTitle->getPrefixedText()
2861                                 );
2862                         } else {
2863                                 $wgOut->showFatalError( $error );
2864                         }
2865                 }
2866         }
2867
2868         /**
2869          * Back-end article deletion
2870          * Deletes the article with database consistency, writes logs, purges caches
2871          * Returns success
2872          */
2873         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true ) {
2874                 global $wgUseSquid, $wgDeferredUpdateList;
2875                 global $wgUseTrackbacks;
2876
2877                 wfDebug( __METHOD__ . "\n" );
2878
2879                 $dbw = wfGetDB( DB_MASTER );
2880                 $ns = $this->mTitle->getNamespace();
2881                 $t = $this->mTitle->getDBkey();
2882                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2883
2884                 if ( $t == '' || $id == 0 ) {
2885                         return false;
2886                 }
2887
2888                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable( $this->getRawText() ), -1 );
2889                 array_push( $wgDeferredUpdateList, $u );
2890
2891                 // Bitfields to further suppress the content
2892                 if ( $suppress ) {
2893                         $bitfield = 0;
2894                         // This should be 15...
2895                         $bitfield |= Revision::DELETED_TEXT;
2896                         $bitfield |= Revision::DELETED_COMMENT;
2897                         $bitfield |= Revision::DELETED_USER;
2898                         $bitfield |= Revision::DELETED_RESTRICTED;
2899                 } else {
2900                         $bitfield = 'rev_deleted';
2901                 }
2902
2903                 $dbw->begin();
2904                 // For now, shunt the revision data into the archive table.
2905                 // Text is *not* removed from the text table; bulk storage
2906                 // is left intact to avoid breaking block-compression or
2907                 // immutable storage schemes.
2908                 //
2909                 // For backwards compatibility, note that some older archive
2910                 // table entries will have ar_text and ar_flags fields still.
2911                 //
2912                 // In the future, we may keep revisions and mark them with
2913                 // the rev_deleted field, which is reserved for this purpose.
2914                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2915                         array(
2916                                 'ar_namespace'  => 'page_namespace',
2917                                 'ar_title'      => 'page_title',
2918                                 'ar_comment'    => 'rev_comment',
2919                                 'ar_user'       => 'rev_user',
2920                                 'ar_user_text'  => 'rev_user_text',
2921                                 'ar_timestamp'  => 'rev_timestamp',
2922                                 'ar_minor_edit' => 'rev_minor_edit',
2923                                 'ar_rev_id'     => 'rev_id',
2924                                 'ar_text_id'    => 'rev_text_id',
2925                                 'ar_text'       => '\'\'', // Be explicit to appease
2926                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2927                                 'ar_len'        => 'rev_len',
2928                                 'ar_page_id'    => 'page_id',
2929                                 'ar_deleted'    => $bitfield
2930                         ), array(
2931                                 'page_id' => $id,
2932                                 'page_id = rev_page'
2933                         ), __METHOD__
2934                 );
2935
2936                 # Delete restrictions for it
2937                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2938
2939                 # Now that it's safely backed up, delete it
2940                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2941                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2942                 if ( !$ok ) {
2943                         $dbw->rollback();
2944                         return false;
2945                 }
2946
2947                 # Fix category table counts
2948                 $cats = array();
2949                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2950                 foreach ( $res as $row ) {
2951                         $cats [] = $row->cl_to;
2952                 }
2953                 $this->updateCategoryCounts( array(), $cats );
2954
2955                 # If using cascading deletes, we can skip some explicit deletes
2956                 if ( !$dbw->cascadingDeletes() ) {
2957                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2958
2959                         if ( $wgUseTrackbacks )
2960                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2961
2962                         # Delete outgoing links
2963                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2964                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2965                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2966                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2967                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2968                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2969                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2970                 }
2971
2972                 # If using cleanup triggers, we can skip some manual deletes
2973                 if ( !$dbw->cleanupTriggers() ) {
2974                         # Clean up recentchanges entries...
2975                         $dbw->delete( 'recentchanges',
2976                                 array( 'rc_type != ' . RC_LOG,
2977                                         'rc_namespace' => $this->mTitle->getNamespace(),
2978                                         'rc_title' => $this->mTitle->getDBkey() ),
2979                                 __METHOD__ );
2980                         $dbw->delete( 'recentchanges',
2981                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
2982                                 __METHOD__ );
2983                 }
2984
2985                 # Clear caches
2986                 Article::onArticleDelete( $this->mTitle );
2987
2988                 # Clear the cached article id so the interface doesn't act like we exist
2989                 $this->mTitle->resetArticleID( 0 );
2990
2991                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2992                 $logtype = $suppress ? 'suppress' : 'delete';
2993                 $log = new LogPage( $logtype );
2994
2995                 # Make sure logging got through
2996                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2997
2998                 if ( $commit ) {
2999                         $dbw->commit();
3000                 }
3001
3002                 return true;
3003         }
3004
3005         /**
3006          * Roll back the most recent consecutive set of edits to a page
3007          * from the same user; fails if there are no eligible edits to
3008          * roll back to, e.g. user is the sole contributor. This function
3009          * performs permissions checks on $wgUser, then calls commitRollback()
3010          * to do the dirty work
3011          *
3012          * @param $fromP String: Name of the user whose edits to rollback.
3013          * @param $summary String: Custom summary. Set to default summary if empty.
3014          * @param $token String: Rollback token.
3015          * @param $bot Boolean: If true, mark all reverted edits as bot.
3016          *
3017          * @param $resultDetails Array: contains result-specific array of additional values
3018          *    'alreadyrolled' : 'current' (rev)
3019          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3020          *
3021          * @return array of errors, each error formatted as
3022          *   array(messagekey, param1, param2, ...).
3023          * On success, the array is empty.  This array can also be passed to
3024          * OutputPage::showPermissionsErrorPage().
3025          */
3026         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
3027                 global $wgUser;
3028                 $resultDetails = null;
3029
3030                 # Check permissions
3031                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
3032                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
3033                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3034
3035                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
3036                         $errors[] = array( 'sessionfailure' );
3037
3038                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
3039                         $errors[] = array( 'actionthrottledtext' );
3040                 }
3041                 # If there were errors, bail out now
3042                 if ( !empty( $errors ) )
3043                         return $errors;
3044
3045                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
3046         }
3047
3048         /**
3049          * Backend implementation of doRollback(), please refer there for parameter
3050          * and return value documentation
3051          *
3052          * NOTE: This function does NOT check ANY permissions, it just commits the
3053          * rollback to the DB Therefore, you should only call this function direct-
3054          * ly if you want to use custom permissions checks. If you don't, use
3055          * doRollback() instead.
3056          */
3057         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
3058                 global $wgUseRCPatrol, $wgUser, $wgLang;
3059                 $dbw = wfGetDB( DB_MASTER );
3060
3061                 if ( wfReadOnly() ) {
3062                         return array( array( 'readonlytext' ) );
3063                 }
3064
3065                 # Get the last editor
3066                 $current = Revision::newFromTitle( $this->mTitle );
3067                 if ( is_null( $current ) ) {
3068                         # Something wrong... no page?
3069                         return array( array( 'notanarticle' ) );
3070                 }
3071
3072                 $from = str_replace( '_', ' ', $fromP );
3073                 # User name given should match up with the top revision.
3074                 # If the user was deleted then $from should be empty.
3075                 if ( $from != $current->getUserText() ) {
3076                         $resultDetails = array( 'current' => $current );
3077                         return array( array( 'alreadyrolled',
3078                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3079                                 htmlspecialchars( $fromP ),
3080                                 htmlspecialchars( $current->getUserText() )
3081                         ) );
3082                 }
3083
3084                 # Get the last edit not by this guy...
3085                 # Note: these may not be public values
3086                 $user = intval( $current->getRawUser() );
3087                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3088                 $s = $dbw->selectRow( 'revision',
3089                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3090                         array( 'rev_page' => $current->getPage(),
3091                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3092                         ), __METHOD__,
3093                         array( 'USE INDEX' => 'page_timestamp',
3094                                 'ORDER BY'  => 'rev_timestamp DESC' )
3095                         );
3096                 if ( $s === false ) {
3097                         # No one else ever edited this page
3098                         return array( array( 'cantrollback' ) );
3099                 } else if ( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
3100                         # Only admins can see this text
3101                         return array( array( 'notvisiblerev' ) );
3102                 }
3103
3104                 $set = array();
3105                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
3106                         # Mark all reverted edits as bot
3107                         $set['rc_bot'] = 1;
3108                 }
3109                 if ( $wgUseRCPatrol ) {
3110                         # Mark all reverted edits as patrolled
3111                         $set['rc_patrolled'] = 1;
3112                 }
3113
3114                 if ( count( $set ) ) {
3115                         $dbw->update( 'recentchanges', $set,
3116                                 array( /* WHERE */
3117                                         'rc_cur_id' => $current->getPage(),
3118                                         'rc_user_text' => $current->getUserText(),
3119                                         "rc_timestamp > '{$s->rev_timestamp}'",
3120                                 ), __METHOD__
3121                         );
3122                 }
3123
3124                 # Generate the edit summary if necessary
3125                 $target = Revision::newFromId( $s->rev_id );
3126                 if ( empty( $summary ) ) {
3127                         if ( $from == '' ) { // no public user name
3128                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3129                         } else {
3130                                 $summary = wfMsgForContent( 'revertpage' );
3131                         }
3132                 }
3133
3134                 # Allow the custom summary to use the same args as the default message
3135                 $args = array(
3136                         $target->getUserText(), $from, $s->rev_id,
3137                         $wgLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ), true ),
3138                         $current->getId(), $wgLang->timeanddate( $current->getTimestamp() )
3139                 );
3140                 $summary = wfMsgReplaceArgs( $summary, $args );
3141
3142                 # Save
3143                 $flags = EDIT_UPDATE;
3144
3145                 if ( $wgUser->isAllowed( 'minoredit' ) )
3146                         $flags |= EDIT_MINOR;
3147
3148                 if ( $bot && ( $wgUser->isAllowed( 'markbotedits' ) || $wgUser->isAllowed( 'bot' ) ) )
3149                         $flags |= EDIT_FORCE_BOT;
3150                 # Actually store the edit
3151                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3152                 if ( !empty( $status->value['revision'] ) ) {
3153                         $revId = $status->value['revision']->getId();
3154                 } else {
3155                         $revId = false;
3156                 }
3157
3158                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3159
3160                 $resultDetails = array(
3161                         'summary' => $summary,
3162                         'current' => $current,
3163                         'target'  => $target,
3164                         'newid'   => $revId
3165                 );
3166                 return array();
3167         }
3168
3169         /**
3170          * User interface for rollback operations
3171          */
3172         public function rollback() {
3173                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
3174                 $details = null;
3175
3176                 $result = $this->doRollback(
3177                         $wgRequest->getVal( 'from' ),
3178                         $wgRequest->getText( 'summary' ),
3179                         $wgRequest->getVal( 'token' ),
3180                         $wgRequest->getBool( 'bot' ),
3181                         $details
3182                 );
3183
3184                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
3185                         $wgOut->rateLimited();
3186                         return;
3187                 }
3188                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3189                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3190                         $errArray = $result[0];
3191                         $errMsg = array_shift( $errArray );
3192                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3193                         if ( isset( $details['current'] ) ) {
3194                                 $current = $details['current'];
3195                                 if ( $current->getComment() != '' ) {
3196                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3197                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3198                                 }
3199                         }
3200                         return;
3201                 }
3202                 # Display permissions errors before read-only message -- there's no
3203                 # point in misleading the user into thinking the inability to rollback
3204                 # is only temporary.
3205                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3206                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
3207                         # move any 'readonlytext' error manually.
3208                         $out = array();
3209                         foreach ( $result as $error ) {
3210                                 if ( $error != array( 'readonlytext' ) ) {
3211                                         $out [] = $error;
3212                                 }
3213                         }
3214                         $wgOut->showPermissionsErrorPage( $out );
3215                         return;
3216                 }
3217                 if ( $result == array( array( 'readonlytext' ) ) ) {
3218                         $wgOut->readOnlyPage();
3219                         return;
3220                 }
3221
3222                 $current = $details['current'];
3223                 $target = $details['target'];
3224                 $newId = $details['newid'];
3225                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3226                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3227                 if ( $current->getUserText() === '' ) {
3228                         $old = wfMsg( 'rev-deleted-user' );
3229                 } else {
3230                         $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
3231                                 . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
3232                 }
3233                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
3234                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
3235                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3236                 $wgOut->returnToMain( false, $this->mTitle );
3237
3238                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3239                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3240                         $de->showDiff( '', '' );
3241                 }
3242         }
3243
3244
3245         /**
3246          * Do standard deferred updates after page view
3247          */
3248         public function viewUpdates() {
3249                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3250                 if ( wfReadOnly() ) {
3251                         return;
3252                 }
3253                 # Don't update page view counters on views from bot users (bug 14044)
3254                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
3255                         Article::incViewCount( $this->getID() );
3256                         $u = new SiteStatsUpdate( 1, 0, 0 );
3257                         array_push( $wgDeferredUpdateList, $u );
3258                 }
3259                 # Update newtalk / watchlist notification status
3260                 $wgUser->clearNotification( $this->mTitle );
3261         }
3262
3263         /**
3264          * Prepare text which is about to be saved.
3265          * Returns a stdclass with source, pst and output members
3266          */
3267         public function prepareTextForEdit( $text, $revid = null ) {
3268                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3269                         // Already prepared
3270                         return $this->mPreparedEdit;
3271                 }
3272                 global $wgParser;
3273                 $edit = (object)array();
3274                 $edit->revid = $revid;
3275                 $edit->newText = $text;
3276                 $edit->pst = $this->preSaveTransform( $text );
3277                 $options = $this->getParserOptions();
3278                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
3279                 $edit->oldText = $this->getContent();
3280                 $this->mPreparedEdit = $edit;
3281                 return $edit;
3282         }
3283
3284         /**
3285          * Do standard deferred updates after page edit.
3286          * Update links tables, site stats, search index and message cache.
3287          * Purges pages that include this page if the text was changed here.
3288          * Every 100th edit, prune the recent changes table.
3289          *
3290          * @private
3291          * @param $text New text of the article
3292          * @param $summary Edit summary
3293          * @param $minoredit Minor edit
3294          * @param $timestamp_of_pagechange Timestamp associated with the page change
3295          * @param $newid rev_id value of the new revision
3296          * @param $changed Whether or not the content actually changed
3297          */
3298         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
3299                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgEnableParserCache;
3300
3301                 wfProfileIn( __METHOD__ );
3302
3303                 # Parse the text
3304                 # Be careful not to double-PST: $text is usually already PST-ed once
3305                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3306                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3307                         $editInfo = $this->prepareTextForEdit( $text, $newid );
3308                 } else {
3309                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3310                         $editInfo = $this->mPreparedEdit;
3311                 }
3312
3313                 # Save it to the parser cache
3314                 if ( $wgEnableParserCache ) {
3315                         $popts = $this->getParserOptions();
3316                         $parserCache = ParserCache::singleton();
3317                         $parserCache->save( $editInfo->output, $this, $popts );
3318                 }
3319
3320                 # Update the links tables
3321                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3322                 $u->doUpdate();
3323
3324                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3325
3326                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3327                         if ( 0 == mt_rand( 0, 99 ) ) {
3328                                 // Flush old entries from the `recentchanges` table; we do this on
3329                                 // random requests so as to avoid an increase in writes for no good reason
3330                                 global $wgRCMaxAge;
3331                                 $dbw = wfGetDB( DB_MASTER );
3332                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3333                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3334                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3335                                 $dbw->query( $sql );
3336                         }
3337                 }
3338
3339                 $id = $this->getID();
3340                 $title = $this->mTitle->getPrefixedDBkey();
3341                 $shortTitle = $this->mTitle->getDBkey();
3342
3343                 if ( 0 == $id ) {
3344                         wfProfileOut( __METHOD__ );
3345                         return;
3346                 }
3347
3348                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3349                 array_push( $wgDeferredUpdateList, $u );
3350                 $u = new SearchUpdate( $id, $title, $text );
3351                 array_push( $wgDeferredUpdateList, $u );
3352
3353                 # If this is another user's talk page, update newtalk
3354                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3355                 # load of user talk pages and piss people off, nor if it's a minor edit
3356                 # by a properly-flagged bot.
3357                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3358                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
3359                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3360                                 $other = User::newFromName( $shortTitle, false );
3361                                 if ( !$other ) {
3362                                         wfDebug( __METHOD__ . ": invalid username\n" );
3363                                 } elseif ( User::isIP( $shortTitle ) ) {
3364                                         // An anonymous user
3365                                         $other->setNewtalk( true );
3366                                 } elseif ( $other->isLoggedIn() ) {
3367                                         $other->setNewtalk( true );
3368                                 } else {
3369                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3370                                 }
3371                         }
3372                 }
3373
3374                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3375                         $wgMessageCache->replace( $shortTitle, $text );
3376                 }
3377
3378                 wfProfileOut( __METHOD__ );
3379         }
3380
3381         /**
3382          * Perform article updates on a special page creation.
3383          *
3384          * @param $rev Revision object
3385          *
3386          * @todo This is a shitty interface function. Kill it and replace the
3387          * other shitty functions like editUpdates and such so it's not needed
3388          * anymore.
3389          */
3390         public function createUpdates( $rev ) {
3391                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3392                 $this->mTotalAdjustment = 1;
3393                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3394                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3395         }
3396
3397         /**
3398          * Generate the navigation links when browsing through an article revisions
3399          * It shows the information as:
3400          *   Revision as of \<date\>; view current revision
3401          *   \<- Previous version | Next Version -\>
3402          *
3403          * @param $oldid String: revision ID of this article revision
3404          */
3405         public function setOldSubtitle( $oldid = 0 ) {
3406                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3407
3408                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3409                         return;
3410                 }
3411
3412                 $unhide = $wgRequest->getInt( 'unhide' ) == 1 &&
3413                         $wgUser->matchEditToken( $wgRequest->getVal( 'token' ), $oldid );
3414                 # Cascade unhide param in links for easy deletion browsing
3415                 $extraParams = array();
3416                 if ( $wgRequest->getVal( 'unhide' ) ) {
3417                         $extraParams['unhide'] = 1;
3418                 }
3419                 $revision = Revision::newFromId( $oldid );
3420
3421                 $current = ( $oldid == $this->mLatest );
3422                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3423                 $tddate = $wgLang->date( $this->mTimestamp, true );
3424                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3425                 $sk = $wgUser->getSkin();
3426                 $lnk = $current
3427                         ? wfMsgHtml( 'currentrevisionlink' )
3428                         : $sk->link(
3429                                 $this->mTitle,
3430                                 wfMsgHtml( 'currentrevisionlink' ),
3431                                 array(),
3432                                 $extraParams,
3433                                 array( 'known', 'noclasses' )
3434                         );
3435                 $curdiff = $current
3436                         ? wfMsgHtml( 'diff' )
3437                         : $sk->link(
3438                                 $this->mTitle,
3439                                 wfMsgHtml( 'diff' ),
3440                                 array(),
3441                                 array(
3442                                         'diff' => 'cur',
3443                                         'oldid' => $oldid
3444                                 ) + $extraParams,
3445                                 array( 'known', 'noclasses' )
3446                         );
3447                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3448                 $prevlink = $prev
3449                         ? $sk->link(
3450                                 $this->mTitle,
3451                                 wfMsgHtml( 'previousrevision' ),
3452                                 array(),
3453                                 array(
3454                                         'direction' => 'prev',
3455                                         'oldid' => $oldid
3456                                 ) + $extraParams,
3457                                 array( 'known', 'noclasses' )
3458                         )
3459                         : wfMsgHtml( 'previousrevision' );
3460                 $prevdiff = $prev
3461                         ? $sk->link(
3462                                 $this->mTitle,
3463                                 wfMsgHtml( 'diff' ),
3464                                 array(),
3465                                 array(
3466                                         'diff' => 'prev',
3467                                         'oldid' => $oldid
3468                                 ) + $extraParams,
3469                                 array( 'known', 'noclasses' )
3470                         )
3471                         : wfMsgHtml( 'diff' );
3472                 $nextlink = $current
3473                         ? wfMsgHtml( 'nextrevision' )
3474                         : $sk->link(
3475                                 $this->mTitle,
3476                                 wfMsgHtml( 'nextrevision' ),
3477                                 array(),
3478                                 array(
3479                                         'direction' => 'next',
3480                                         'oldid' => $oldid
3481                                 ) + $extraParams,
3482                                 array( 'known', 'noclasses' )
3483                         );
3484                 $nextdiff = $current
3485                         ? wfMsgHtml( 'diff' )
3486                         : $sk->link(
3487                                 $this->mTitle,
3488                                 wfMsgHtml( 'diff' ),
3489                                 array(),
3490                                 array(
3491                                         'diff' => 'next',
3492                                         'oldid' => $oldid
3493                                 ) + $extraParams,
3494                                 array( 'known', 'noclasses' )
3495                         );
3496
3497                 $cdel = '';
3498                 // User can delete revisions or view deleted revisions...
3499                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3500                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3501                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3502                                 $cdel = $sk->revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3503                         } else {
3504                                 $query = array(
3505                                         'type'   => 'revision',
3506                                         'target' => $this->mTitle->getPrefixedDbkey(),
3507                                         'ids'    => $oldid
3508                                 );
3509                                 $cdel = $sk->revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3510                         }
3511                         $cdel .= ' ';
3512                 }
3513
3514                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3515                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3516
3517                 $m = wfMsg( 'revision-info-current' );
3518                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3519                         ? 'revision-info-current'
3520                         : 'revision-info';
3521
3522                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3523                         wfMsgExt(
3524                                 $infomsg,
3525                                 array( 'parseinline', 'replaceafter' ),
3526                                 $td,
3527                                 $userlinks,
3528                                 $revision->getID(),
3529                                 $tddate,
3530                                 $tdtime,
3531                                 $revision->getUser()
3532                         ) .
3533                         "</div>\n" .
3534                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3535                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3536                 $wgOut->setSubtitle( $r );
3537         }
3538
3539         /**
3540          * This function is called right before saving the wikitext,
3541          * so we can do things like signatures and links-in-context.
3542          *
3543          * @param $text String
3544          */
3545         public function preSaveTransform( $text ) {
3546                 global $wgParser, $wgUser;
3547                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3548         }
3549
3550         /* Caching functions */
3551
3552         /**
3553          * checkLastModified returns true if it has taken care of all
3554          * output to the client that is necessary for this request.
3555          * (that is, it has sent a cached version of the page)
3556          */
3557         protected function tryFileCache() {
3558                 static $called = false;
3559                 if ( $called ) {
3560                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3561                         return false;
3562                 }
3563                 $called = true;
3564                 if ( $this->isFileCacheable() ) {
3565                         $cache = new HTMLFileCache( $this->mTitle );
3566                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3567                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3568                                 $cache->loadFromFileCache();
3569                                 return true;
3570                         } else {
3571                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3572                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3573                         }
3574                 } else {
3575                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3576                 }
3577                 return false;
3578         }
3579
3580         /**
3581          * Check if the page can be cached
3582          * @return bool
3583          */
3584         public function isFileCacheable() {
3585                 $cacheable = false;
3586                 if ( HTMLFileCache::useFileCache() ) {
3587                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3588                         // Extension may have reason to disable file caching on some pages.
3589                         if ( $cacheable ) {
3590                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3591                         }
3592                 }
3593                 return $cacheable;
3594         }
3595
3596         /**
3597          * Loads page_touched and returns a value indicating if it should be used
3598          *
3599          */
3600         public function checkTouched() {
3601                 if ( !$this->mDataLoaded ) {
3602                         $this->loadPageData();
3603                 }
3604                 return !$this->mIsRedirect;
3605         }
3606
3607         /**
3608          * Get the page_touched field
3609          */
3610         public function getTouched() {
3611                 # Ensure that page data has been loaded
3612                 if ( !$this->mDataLoaded ) {
3613                         $this->loadPageData();
3614                 }
3615                 return $this->mTouched;
3616         }
3617
3618         /**
3619          * Get the page_latest field
3620          */
3621         public function getLatest() {
3622                 if ( !$this->mDataLoaded ) {
3623                         $this->loadPageData();
3624                 }
3625                 return (int)$this->mLatest;
3626         }
3627
3628         /**
3629          * Edit an article without doing all that other stuff
3630          * The article must already exist; link tables etc
3631          * are not updated, caches are not flushed.
3632          *
3633          * @param $text String: text submitted
3634          * @param $comment String: comment submitted
3635          * @param $minor Boolean: whereas it's a minor modification
3636          */
3637         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3638                 wfProfileIn( __METHOD__ );
3639
3640                 $dbw = wfGetDB( DB_MASTER );
3641                 $revision = new Revision( array(
3642                         'page'       => $this->getId(),
3643                         'text'       => $text,
3644                         'comment'    => $comment,
3645                         'minor_edit' => $minor ? 1 : 0,
3646                         ) );
3647                 $revision->insertOn( $dbw );
3648                 $this->updateRevisionOn( $dbw, $revision );
3649
3650                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
3651
3652                 wfProfileOut( __METHOD__ );
3653         }
3654
3655         /**
3656          * Used to increment the view counter
3657          *
3658          * @param $id Integer: article id
3659          */
3660         public static function incViewCount( $id ) {
3661                 $id = intval( $id );
3662                 global $wgHitcounterUpdateFreq;
3663
3664                 $dbw = wfGetDB( DB_MASTER );
3665                 $pageTable = $dbw->tableName( 'page' );
3666                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3667                 $acchitsTable = $dbw->tableName( 'acchits' );
3668
3669                 if ( $wgHitcounterUpdateFreq <= 1 ) {
3670                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3671                         return;
3672                 }
3673
3674                 # Not important enough to warrant an error page in case of failure
3675                 $oldignore = $dbw->ignoreErrors( true );
3676
3677                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3678
3679                 $checkfreq = intval( $wgHitcounterUpdateFreq / 25 + 1 );
3680                 if ( ( rand() % $checkfreq != 0 ) or ( $dbw->lastErrno() != 0 ) ) {
3681                         # Most of the time (or on SQL errors), skip row count check
3682                         $dbw->ignoreErrors( $oldignore );
3683                         return;
3684                 }
3685
3686                 $res = $dbw->query( "SELECT COUNT(*) as n FROM $hitcounterTable" );
3687                 $row = $dbw->fetchObject( $res );
3688                 $rown = intval( $row->n );
3689                 if ( $rown >= $wgHitcounterUpdateFreq ) {
3690                         wfProfileIn( 'Article::incViewCount-collect' );
3691                         $old_user_abort = ignore_user_abort( true );
3692
3693                         $dbType = $dbw->getType();
3694                         $dbw->lockTables( array(), array( 'hitcounter' ), __METHOD__, false );
3695                         $tabletype = $dbType == 'mysql' ? "ENGINE=HEAP " : '';
3696                         $dbw->query( "CREATE TEMPORARY TABLE $acchitsTable $tabletype AS " .
3697                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable " .
3698                                 'GROUP BY hc_id', __METHOD__ );
3699                         $dbw->delete( 'hitcounter', '*', __METHOD__ );
3700                         $dbw->unlockTables( __METHOD__ );
3701                         if ( $dbType == 'mysql' ) {
3702                                 $dbw->query( "UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n " .
3703                                         'WHERE page_id = hc_id', __METHOD__ );
3704                         }
3705                         else {
3706                                 $dbw->query( "UPDATE $pageTable SET page_counter=page_counter + hc_n " .
3707                                         "FROM $acchitsTable WHERE page_id = hc_id", __METHOD__ );
3708                         }
3709                         $dbw->query( "DROP TABLE $acchitsTable", __METHOD__ );
3710
3711                         ignore_user_abort( $old_user_abort );
3712                         wfProfileOut( 'Article::incViewCount-collect' );
3713                 }
3714                 $dbw->ignoreErrors( $oldignore );
3715         }
3716
3717         /**#@+
3718          * The onArticle*() functions are supposed to be a kind of hooks
3719          * which should be called whenever any of the specified actions
3720          * are done.
3721          *
3722          * This is a good place to put code to clear caches, for instance.
3723          *
3724          * This is called on page move and undelete, as well as edit
3725          *
3726          * @param $title a title object
3727          */
3728         public static function onArticleCreate( $title ) {
3729                 # Update existence markers on article/talk tabs...
3730                 if ( $title->isTalkPage() ) {
3731                         $other = $title->getSubjectPage();
3732                 } else {
3733                         $other = $title->getTalkPage();
3734                 }
3735                 $other->invalidateCache();
3736                 $other->purgeSquid();
3737
3738                 $title->touchLinks();
3739                 $title->purgeSquid();
3740                 $title->deleteTitleProtection();
3741         }
3742
3743         public static function onArticleDelete( $title ) {
3744                 global $wgMessageCache;
3745                 # Update existence markers on article/talk tabs...
3746                 if ( $title->isTalkPage() ) {
3747                         $other = $title->getSubjectPage();
3748                 } else {
3749                         $other = $title->getTalkPage();
3750                 }
3751                 $other->invalidateCache();
3752                 $other->purgeSquid();
3753
3754                 $title->touchLinks();
3755                 $title->purgeSquid();
3756
3757                 # File cache
3758                 HTMLFileCache::clearFileCache( $title );
3759
3760                 # Messages
3761                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3762                         $wgMessageCache->replace( $title->getDBkey(), false );
3763                 }
3764                 # Images
3765                 if ( $title->getNamespace() == NS_FILE ) {
3766                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3767                         $update->doUpdate();
3768                 }
3769                 # User talk pages
3770                 if ( $title->getNamespace() == NS_USER_TALK ) {
3771                         $user = User::newFromName( $title->getText(), false );
3772                         $user->setNewtalk( false );
3773                 }
3774                 # Image redirects
3775                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3776         }
3777
3778         /**
3779          * Purge caches on page update etc
3780          */
3781         public static function onArticleEdit( $title, $flags = '' ) {
3782                 global $wgDeferredUpdateList;
3783
3784                 // Invalidate caches of articles which include this page
3785                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3786
3787                 // Invalidate the caches of all pages which redirect here
3788                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3789
3790                 # Purge squid for this page only
3791                 $title->purgeSquid();
3792
3793                 # Clear file cache for this page only
3794                 HTMLFileCache::clearFileCache( $title );
3795         }
3796
3797         /**#@-*/
3798
3799         /**
3800          * Overriden by ImagePage class, only present here to avoid a fatal error
3801          * Called for ?action=revert
3802          */
3803         public function revert() {
3804                 global $wgOut;
3805                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3806         }
3807
3808         /**
3809          * Info about this page
3810          * Called for ?action=info when $wgAllowPageInfo is on.
3811          */
3812         public function info() {
3813                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3814
3815                 if ( !$wgAllowPageInfo ) {
3816                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3817                         return;
3818                 }
3819
3820                 $page = $this->mTitle->getSubjectPage();
3821
3822                 $wgOut->setPagetitle( $page->getPrefixedText() );
3823                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3824                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3825
3826                 if ( !$this->mTitle->exists() ) {
3827                         $wgOut->addHTML( '<div class="noarticletext">' );
3828                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3829                                 // This doesn't quite make sense; the user is asking for
3830                                 // information about the _page_, not the message... -- RC
3831                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3832                         } else {
3833                                 $msg = $wgUser->isLoggedIn()
3834                                         ? 'noarticletext'
3835                                         : 'noarticletextanon';
3836                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3837                         }
3838                         $wgOut->addHTML( '</div>' );
3839                 } else {
3840                         $dbr = wfGetDB( DB_SLAVE );
3841                         $wl_clause = array(
3842                                 'wl_title'     => $page->getDBkey(),
3843                                 'wl_namespace' => $page->getNamespace() );
3844                         $numwatchers = $dbr->selectField(
3845                                 'watchlist',
3846                                 'COUNT(*)',
3847                                 $wl_clause,
3848                                 __METHOD__,
3849                                 $this->getSelectOptions() );
3850
3851                         $pageInfo = $this->pageCountInfo( $page );
3852                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3853
3854                         $wgOut->addHTML( "<ul><li>" . wfMsg( "numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3855                         $wgOut->addHTML( "<li>" . wfMsg( 'numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>' );
3856                         if ( $talkInfo ) {
3857                                 $wgOut->addHTML( '<li>' . wfMsg( "numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>' );
3858                         }
3859                         $wgOut->addHTML( '<li>' . wfMsg( "numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3860                         if ( $talkInfo ) {
3861                                 $wgOut->addHTML( '<li>' . wfMsg( 'numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3862                         }
3863                         $wgOut->addHTML( '</ul>' );
3864                 }
3865         }
3866
3867         /**
3868          * Return the total number of edits and number of unique editors
3869          * on a given page. If page does not exist, returns false.
3870          *
3871          * @param $title Title object
3872          * @return array
3873          */
3874         public function pageCountInfo( $title ) {
3875                 $id = $title->getArticleId();
3876                 if ( $id == 0 ) {
3877                         return false;
3878                 }
3879                 $dbr = wfGetDB( DB_SLAVE );
3880                 $rev_clause = array( 'rev_page' => $id );
3881                 $edits = $dbr->selectField(
3882                         'revision',
3883                         'COUNT(rev_page)',
3884                         $rev_clause,
3885                         __METHOD__,
3886                         $this->getSelectOptions()
3887                 );
3888                 $authors = $dbr->selectField(
3889                         'revision',
3890                         'COUNT(DISTINCT rev_user_text)',
3891                         $rev_clause,
3892                         __METHOD__,
3893                         $this->getSelectOptions()
3894                 );
3895                 return array( 'edits' => $edits, 'authors' => $authors );
3896         }
3897
3898         /**
3899          * Return a list of templates used by this article.
3900          * Uses the templatelinks table
3901          *
3902          * @return Array of Title objects
3903          */
3904         public function getUsedTemplates() {
3905                 $result = array();
3906                 $id = $this->mTitle->getArticleID();
3907                 if ( $id == 0 ) {
3908                         return array();
3909                 }
3910                 $dbr = wfGetDB( DB_SLAVE );
3911                 $res = $dbr->select( array( 'templatelinks' ),
3912                         array( 'tl_namespace', 'tl_title' ),
3913                         array( 'tl_from' => $id ),
3914                         __METHOD__ );
3915                 if ( $res !== false ) {
3916                         foreach ( $res as $row ) {
3917                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3918                         }
3919                 }
3920                 $dbr->freeResult( $res );
3921                 return $result;
3922         }
3923
3924         /**
3925          * Returns a list of hidden categories this page is a member of.
3926          * Uses the page_props and categorylinks tables.
3927          *
3928          * @return Array of Title objects
3929          */
3930         public function getHiddenCategories() {
3931                 $result = array();
3932                 $id = $this->mTitle->getArticleID();
3933                 if ( $id == 0 ) {
3934                         return array();
3935                 }
3936                 $dbr = wfGetDB( DB_SLAVE );
3937                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3938                         array( 'cl_to' ),
3939                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3940                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
3941                         __METHOD__ );
3942                 if ( $res !== false ) {
3943                         foreach ( $res as $row ) {
3944                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3945                         }
3946                 }
3947                 $dbr->freeResult( $res );
3948                 return $result;
3949         }
3950
3951         /**
3952         * Return an applicable autosummary if one exists for the given edit.
3953         * @param $oldtext String: the previous text of the page.
3954         * @param $newtext String: The submitted text of the page.
3955         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
3956         * @return string An appropriate autosummary, or an empty string.
3957         */
3958         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3959                 # Decide what kind of autosummary is needed.
3960
3961                 # Redirect autosummaries
3962                 $ot = Title::newFromRedirect( $oldtext );
3963                 $rt = Title::newFromRedirect( $newtext );
3964                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
3965                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3966                 }
3967
3968                 # New page autosummaries
3969                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
3970                         # If they're making a new article, give its text, truncated, in the summary.
3971                         global $wgContLang;
3972                         $truncatedtext = $wgContLang->truncate(
3973                                 str_replace( "\n", ' ', $newtext ),
3974                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
3975                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3976                 }
3977
3978                 # Blanking autosummaries
3979                 if ( $oldtext != '' && $newtext == '' ) {
3980                         return wfMsgForContent( 'autosumm-blank' );
3981                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
3982                         # Removing more than 90% of the article
3983                         global $wgContLang;
3984                         $truncatedtext = $wgContLang->truncate(
3985                                 $newtext,
3986                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
3987                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3988                 }
3989
3990                 # If we reach this point, there's no applicable autosummary for our case, so our
3991                 # autosummary is empty.
3992                 return '';
3993         }
3994
3995         /**
3996          * Add the primary page-view wikitext to the output buffer
3997          * Saves the text into the parser cache if possible.
3998          * Updates templatelinks if it is out of date.
3999          *
4000          * @param $text String
4001          * @param $cache Boolean
4002          */
4003         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
4004                 global $wgOut;
4005
4006                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
4007                 $wgOut->addParserOutput( $this->mParserOutput );
4008         }
4009
4010         /**
4011          * This does all the heavy lifting for outputWikitext, except it returns the parser
4012          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
4013          * say, embedding thread pages within a discussion system (LiquidThreads)
4014          */
4015         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
4016                 global $wgParser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
4017
4018                 if ( !$parserOptions ) {
4019                         $parserOptions = $this->getParserOptions();
4020                 }
4021
4022                 $time = - wfTime();
4023                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
4024                         $parserOptions, true, true, $this->getRevIdFetched() );
4025                 $time += wfTime();
4026
4027                 # Timing hack
4028                 if ( $time > 3 ) {
4029                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
4030                                 $this->mTitle->getPrefixedDBkey() ) );
4031                 }
4032
4033                 if ( $wgEnableParserCache && $cache && $this && $this->mParserOutput->getCacheTime() != -1 ) {
4034                         $parserCache = ParserCache::singleton();
4035                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
4036                 }
4037                 // Make sure file cache is not used on uncacheable content.
4038                 // Output that has magic words in it can still use the parser cache
4039                 // (if enabled), though it will generally expire sooner.
4040                 if ( $this->mParserOutput->getCacheTime() == -1 || $this->mParserOutput->containsOldMagic() ) {
4041                         $wgUseFileCache = false;
4042                 }
4043                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4044                 return $this->mParserOutput;
4045         }
4046
4047         /**
4048          * Get parser options suitable for rendering the primary article wikitext
4049          */
4050         public function getParserOptions() {
4051                 global $wgUser;
4052                 if ( !$this->mParserOptions ) {
4053                         $this->mParserOptions = new ParserOptions( $wgUser );
4054                         $this->mParserOptions->setTidy( true );
4055                         $this->mParserOptions->enableLimitReport();
4056                 }
4057                 return $this->mParserOptions;
4058         }
4059
4060         protected function doCascadeProtectionUpdates( $parserOutput ) {
4061                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4062                         return;
4063                 }
4064
4065                 // templatelinks table may have become out of sync,
4066                 // especially if using variable-based transclusions.
4067                 // For paranoia, check if things have changed and if
4068                 // so apply updates to the database. This will ensure
4069                 // that cascaded protections apply as soon as the changes
4070                 // are visible.
4071
4072                 # Get templates from templatelinks
4073                 $id = $this->mTitle->getArticleID();
4074
4075                 $tlTemplates = array();
4076
4077                 $dbr = wfGetDB( DB_SLAVE );
4078                 $res = $dbr->select( array( 'templatelinks' ),
4079                         array( 'tl_namespace', 'tl_title' ),
4080                         array( 'tl_from' => $id ),
4081                         __METHOD__ );
4082
4083                 global $wgContLang;
4084                 foreach ( $res as $row ) {
4085                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4086                 }
4087
4088                 # Get templates from parser output.
4089                 $poTemplates = array();
4090                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4091                         foreach ( $templates as $dbk => $id ) {
4092                                 $poTemplates["$ns:$dbk"] = true;
4093                         }
4094                 }
4095
4096                 # Get the diff
4097                 # Note that we simulate array_diff_key in PHP <5.0.x
4098                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4099
4100                 if ( count( $templates_diff ) > 0 ) {
4101                         # Whee, link updates time.
4102                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4103                         $u->doUpdate();
4104                 }
4105         }
4106
4107         /**
4108          * Update all the appropriate counts in the category table, given that
4109          * we've added the categories $added and deleted the categories $deleted.
4110          *
4111          * @param $added array   The names of categories that were added
4112          * @param $deleted array The names of categories that were deleted
4113          * @return null
4114          */
4115         public function updateCategoryCounts( $added, $deleted ) {
4116                 $ns = $this->mTitle->getNamespace();
4117                 $dbw = wfGetDB( DB_MASTER );
4118
4119                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4120                 # exist, we might legitimately not create it, but it's simpler to just
4121                 # create it and then give it a negative value, since the value is bogus
4122                 # anyway.
4123                 #
4124                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4125                 $insertCats = array_merge( $added, $deleted );
4126                 if ( !$insertCats ) {
4127                         # Okay, nothing to do
4128                         return;
4129                 }
4130                 $insertRows = array();
4131                 foreach ( $insertCats as $cat ) {
4132                         $insertRows[] = array(
4133                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
4134                                 'cat_title' => $cat
4135                         );
4136                 }
4137                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4138
4139                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4140                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4141                 if ( $ns == NS_CATEGORY ) {
4142                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4143                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4144                 } elseif ( $ns == NS_FILE ) {
4145                         $addFields[]    = 'cat_files = cat_files + 1';
4146                         $removeFields[] = 'cat_files = cat_files - 1';
4147                 }
4148
4149                 if ( $added ) {
4150                         $dbw->update(
4151                                 'category',
4152                                 $addFields,
4153                                 array( 'cat_title' => $added ),
4154                                 __METHOD__
4155                         );
4156                 }
4157                 if ( $deleted ) {
4158                         $dbw->update(
4159                                 'category',
4160                                 $removeFields,
4161                                 array( 'cat_title' => $deleted ),
4162                                 __METHOD__
4163                         );
4164                 }
4165         }
4166
4167         /** Lightweight method to get the parser output for a page, checking the parser cache
4168          * and so on. Doesn't consider most of the stuff that Article::view is forced to
4169          * consider, so it's not appropriate to use there.
4170          */
4171         function getParserOutput( $oldid = null ) {
4172                 global $wgEnableParserCache, $wgUser, $wgOut;
4173
4174                 // Should the parser cache be used?
4175                 $useParserCache = $wgEnableParserCache &&
4176                           intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
4177                           $this->exists() &&
4178                           $oldid === null;
4179
4180                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4181                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
4182                         wfIncrStats( 'pcache_miss_stub' );
4183                 }
4184
4185                 $parserOutput = false;
4186                 if ( $useParserCache ) {
4187                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4188                 }
4189
4190                 if ( $parserOutput === false ) {
4191                         // Cache miss; parse and output it.
4192                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4193
4194                         return $this->getOutputFromWikitext( $rev->getText(), $useParserCache );
4195                 } else {
4196                         return $parserOutput;
4197                 }
4198         }
4199 }