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 mixed value of $x, or value stored in Article::mForUpdate
 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 mixed string containing article contents, or boolean
 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 = $this->mLastRevision->getId();
 664                 }
 665         }
 666
 667         /**
 668          * @return string GMT timestamp of last article revision
 669          **/
 670
 671         public function getTimestamp() {
 672                 // Check if the field has been filled by ParserCache::get()
 673                 if ( !$this->mTimestamp ) {
 674                         $this->loadLastEdit();
 675                 }
 676                 return wfTimestamp( TS_MW, $this->mTimestamp );
 677         }
 678
 679         /**
 680          * @return int user ID for the user that made the last article revision
 681          */
 682         public function getUser() {
 683                 $this->loadLastEdit();
 684                 return $this->mUser;
 685         }
 686
 687         /**
 688          * @return string username of the user that made the last article revision
 689          */
 690         public function getUserText() {
 691                 $this->loadLastEdit();
 692                 return $this->mUserText;
 693         }
 694
 695         /**
 696          * @return string Comment stored for the last article revision
 697          */
 698         public function getComment() {
 699                 $this->loadLastEdit();
 700                 return $this->mComment;
 701         }
 702
 703         /**
 704          * Returns true if last revision was marked as "minor edit"
 705          *
 706          * @return boolean Minor edit indicator for the last article revision.
 707          */
 708         public function getMinorEdit() {
 709                 $this->loadLastEdit();
 710                 return $this->mMinorEdit;
 711         }
 712
 713         /**
 714          * Use this to fetch the rev ID used on page views
 715          *
 716          * @return int revision ID of last article revision
 717          */
 718         public function getRevIdFetched() {
 719                 $this->loadLastEdit();
 720                 return $this->mRevIdFetched;
 721         }
 722
 723         /**
 724          * @param $limit Integer: default 0.
 725          * @param $offset Integer: default 0.
 726          * @return UserArrayFromResult object with User objects of article contributors for requested range
 727          */
 728         public function getContributors( $limit = 0, $offset = 0 ) {
 729                 # XXX: this is expensive; cache this info somewhere.
 730
 731                 $dbr = wfGetDB( DB_SLAVE );
 732                 $revTable = $dbr->tableName( 'revision' );
 733                 $userTable = $dbr->tableName( 'user' );
 734
 735                 $pageId = $this->getId();
 736
 737                 $user = $this->getUser();
 738                 if ( $user ) {
 739                         $excludeCond = "AND rev_user != $user";
 740                 } else {
 741                         $userText = $dbr->addQuotes( $this->getUserText() );
 742                         $excludeCond = "AND rev_user_text != $userText";
 743                 }
 744
 745                 $deletedBit = $dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER ); // username hidden?
 746
 747                 $sql = "SELECT {$userTable}.*, rev_user_text as user_name, MAX(rev_timestamp) as timestamp
 748                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 749                         WHERE rev_page = $pageId
 750                         $excludeCond
 751                         AND $deletedBit = 0
 752                         GROUP BY rev_user, rev_user_text
 753                         ORDER BY timestamp DESC";
 754
 755                 if ( $limit > 0 )
 756                         $sql = $dbr->limitResult( $sql, $limit, $offset );
 757
 758                 $sql .= ' ' . $this->getSelectOptions();
 759                 $res = $dbr->query( $sql, __METHOD__ );
 760
 761                 return new UserArrayFromResult( $res );
 762         }
 763
 764         /**
 765          * This is the default action of the index.php entry point: just view the
 766          * page of the given title.
 767          */
 768         public function view() {
 769                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 770                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 771                 global $wgUseTrackbacks, $wgUseFileCache;
 772
 773                 wfProfileIn( __METHOD__ );
 774
 775                 # Get variables from query string
 776                 $oldid = $this->getOldID();
 777                 $parserCache = ParserCache::singleton();
 778
 779                 $parserOptions = clone $this->getParserOptions();
 780                 # Render printable version, use printable version cache
 781                 if ( $wgOut->isPrintable() ) {
 782                         $parserOptions->setIsPrintable( true );
 783                 }
 784
 785                 # Try client and file cache
 786                 if ( $oldid === 0 && $this->checkTouched() ) {
 787                         global $wgUseETag;
 788                         if ( $wgUseETag ) {
 789                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 790                         }
 791                         # Is is client cached?
 792                         if ( $wgOut->checkLastModified( $this->getTouched() ) ) {
 793                                 wfDebug( __METHOD__ . ": done 304\n" );
 794                                 wfProfileOut( __METHOD__ );
 795                                 return;
 796                         # Try file cache
 797                         } else if ( $wgUseFileCache && $this->tryFileCache() ) {
 798                                 wfDebug( __METHOD__ . ": done file cache\n" );
 799                                 # tell wgOut that output is taken care of
 800                                 $wgOut->disable();
 801                                 $this->viewUpdates();
 802                                 wfProfileOut( __METHOD__ );
 803                                 return;
 804                         }
 805                 }
 806
 807                 $sk = $wgUser->getSkin();
 808
 809                 # getOldID may want us to redirect somewhere else
 810                 if ( $this->mRedirectUrl ) {
 811                         $wgOut->redirect( $this->mRedirectUrl );
 812                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 813                         wfProfileOut( __METHOD__ );
 814                         return;
 815                 }
 816
 817                 $wgOut->setArticleFlag( true );
 818                 # Set page title (may be overridden by DISPLAYTITLE)
 819                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 820
 821                 # If we got diff in the query, we want to see a diff page instead of the article.
 822                 if ( !is_null( $wgRequest->getVal( 'diff' ) ) ) {
 823                         wfDebug( __METHOD__ . ": showing diff page\n" );
 824                         $this->showDiffPage();
 825                         wfProfileOut( __METHOD__ );
 826                         return;
 827                 }
 828
 829                 # Should the parser cache be used?
 830                 $useParserCache = $this->useParserCache( $oldid );
 831                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 832                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 833                         wfIncrStats( 'pcache_miss_stub' );
 834                 }
 835
 836                 # For the main page, overwrite the <title> element with the con-
 837                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 838                 # that's not empty).
 839                 if ( $this->mTitle->equals( Title::newMainPage() )
 840                         && ( $m = wfMsgForContent( 'pagetitle-view-mainpage' ) ) !== '' )
 841                 {
 842                         $wgOut->setHTMLTitle( $m );
 843                 }
 844
 845                 $wasRedirected = $this->showRedirectedFromHeader();
 846                 $this->showNamespaceHeader();
 847
 848                 # Iterate through the possible ways of constructing the output text.
 849                 # Keep going until $outputDone is set, or we run out of things to do.
 850                 $pass = 0;
 851                 $outputDone = false;
 852                 while ( !$outputDone && ++$pass ) {
 853                         switch( $pass ) {
 854                                 case 1:
 855                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 856                                         break;
 857
 858                                 case 2:
 859                                         # Try the parser cache
 860                                         if ( $useParserCache ) {
 861                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 862                                                 if ( $this->mParserOutput !== false ) {
 863                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 864                                                         $wgOut->addParserOutput( $this->mParserOutput );
 865                                                         # Ensure that UI elements requiring revision ID have
 866                                                         # the correct version information.
 867                                                         $wgOut->setRevisionId( $this->mLatest );
 868                                                         $outputDone = true;
 869                                                 }
 870                                         }
 871                                         break;
 872
 873                                 case 3:
 874                                         $text = $this->getContent();
 875                                         if ( $text === false || $this->getID() == 0 ) {
 876                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 877                                                 $this->showMissingArticle();
 878                                                 wfProfileOut( __METHOD__ );
 879                                                 return;
 880                                         }
 881
 882                                         # Another whitelist check in case oldid is altering the title
 883                                         if ( !$this->mTitle->userCanRead() ) {
 884                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 885                                                 $wgOut->loginToUse();
 886                                                 $wgOut->output();
 887                                                 $wgOut->disable();
 888                                                 wfProfileOut( __METHOD__ );
 889                                                 return;
 890                                         }
 891
 892                                         # Are we looking at an old revision
 893                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 894                                                 $this->setOldSubtitle( $oldid );
 895                                                 if ( !$this->showDeletedRevisionHeader() ) {
 896                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 897                                                         wfProfileOut( __METHOD__ );
 898                                                         return;
 899                                                 }
 900                                                 # If this "old" version is the current, then try the parser cache...
 901                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
 902                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 903                                                         if ( $this->mParserOutput ) {
 904                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 905                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 906                                                                 $wgOut->setRevisionId( $this->mLatest );
 907                                                                 $this->showViewFooter();
 908                                                                 $this->viewUpdates();
 909                                                                 wfProfileOut( __METHOD__ );
 910                                                                 return;
 911                                                         }
 912                                                 }
 913                                         }
 914
 915                                         # Ensure that UI elements requiring revision ID have
 916                                         # the correct version information.
 917                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 918
 919                                         # Pages containing custom CSS or JavaScript get special treatment
 920                                         if ( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 921                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 922                                                 $this->showCssOrJsPage();
 923                                                 $outputDone = true;
 924                                         } else if ( $rt = Title::newFromRedirectArray( $text ) ) {
 925                                                 wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 926                                                 # Viewing a redirect page (e.g. with parameter redirect=no)
 927                                                 # Don't append the subtitle if this was an old revision
 928                                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 929                                                 # Parse just to get categories, displaytitle, etc.
 930                                                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
 931                                                 $wgOut->addParserOutputNoText( $this->mParserOutput );
 932                                                 $outputDone = true;
 933                                         }
 934                                         break;
 935
 936                                 case 4:
 937                                         # Run the parse, protected by a pool counter
 938                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 939                                         $key = $parserCache->getKey( $this, $parserOptions );
 940                                         $poolCounter = PoolCounter::factory( 'Article::view', $key );
 941                                         $dirtyCallback = $useParserCache ? array( $this, 'tryDirtyCache' ) : false;
 942                                         $status = $poolCounter->executeProtected( array( $this, 'doViewParse' ), $dirtyCallback );
 943
 944                                         if ( !$status->isOK() ) {
 945                                                 # Connection or timeout error
 946                                                 $this->showPoolError( $status );
 947                                                 wfProfileOut( __METHOD__ );
 948                                                 return;
 949                                         } else {
 950                                                 $outputDone = true;
 951                                         }
 952                                         break;
 953
 954                                 # Should be unreachable, but just in case...
 955                                 default:
 956                                         break 2;
 957                         }
 958                 }
 959
 960                 # Now that we've filled $this->mParserOutput, we know whether
 961                 # there are any __NOINDEX__ tags on the page
 962                 $policy = $this->getRobotPolicy( 'view' );
 963                 $wgOut->setIndexPolicy( $policy['index'] );
 964                 $wgOut->setFollowPolicy( $policy['follow'] );
 965
 966                 $this->showViewFooter();
 967                 $this->viewUpdates();
 968                 wfProfileOut( __METHOD__ );
 969         }
 970
 971         /**
 972          * Show a diff page according to current request variables. For use within
 973          * Article::view() only, other callers should use the DifferenceEngine class.
 974          */
 975         public function showDiffPage() {
 976                 global $wgOut, $wgRequest, $wgUser;
 977
 978                 $diff = $wgRequest->getVal( 'diff' );
 979                 $rcid = $wgRequest->getVal( 'rcid' );
 980                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 981                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 982                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
 983                 $oldid = $this->getOldID();
 984
 985                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $unhide );
 986                 // DifferenceEngine directly fetched the revision:
 987                 $this->mRevIdFetched = $de->mNewid;
 988                 $de->showDiffPage( $diffOnly );
 989
 990                 // Needed to get the page's current revision
 991                 $this->loadPageData();
 992                 if ( $diff == 0 || $diff == $this->mLatest ) {
 993                         # Run view updates for current revision only
 994                         $this->viewUpdates();
 995                 }
 996         }
 997
 998         /**
 999          * Show a page view for a page formatted as CSS or JavaScript. To be called by
1000          * Article::view() only.
1001          *
1002          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
1003          * page views.
1004          */
1005         public function showCssOrJsPage() {
1006                 global $wgOut;
1007                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
1008                 // Give hooks a chance to customise the output
1009                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
1010                         // Wrap the whole lot in a <pre> and don't parse
1011                         $m = array();
1012                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
1013                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
1014                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
1015                         $wgOut->addHTML( "\n</pre>\n" );
1016                 }
1017         }
1018
1019         /**
1020          * Get the robot policy to be used for the current action=view request.
1021          * @return String the policy that should be set
1022          * @deprecated use getRobotPolicy() instead, which returns an associative
1023          *    array
1024          */
1025         public function getRobotPolicyForView() {
1026                 wfDeprecated( __FUNC__ );
1027                 $policy = $this->getRobotPolicy( 'view' );
1028                 return $policy['index'] . ',' . $policy['follow'];
1029         }
1030
1031         /**
1032          * Get the robot policy to be used for the current view
1033          * @param $action String the action= GET parameter
1034          * @return Array the policy that should be set
1035          * TODO: actions other than 'view'
1036          */
1037         public function getRobotPolicy( $action ) {
1038
1039                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1040                 global $wgDefaultRobotPolicy, $wgRequest;
1041
1042                 $ns = $this->mTitle->getNamespace();
1043                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
1044                         # Don't index user and user talk pages for blocked users (bug 11443)
1045                         if ( !$this->mTitle->isSubpage() ) {
1046                                 $block = new Block();
1047                                 if ( $block->load( $this->mTitle->getText() ) ) {
1048                                         return array( 'index'  => 'noindex',
1049                                                       'follow' => 'nofollow' );
1050                                 }
1051                         }
1052                 }
1053
1054                 if ( $this->getID() === 0 || $this->getOldID() ) {
1055                         # Non-articles (special pages etc), and old revisions
1056                         return array( 'index'  => 'noindex',
1057                                       'follow' => 'nofollow' );
1058                 } elseif ( $wgOut->isPrintable() ) {
1059                         # Discourage indexing of printable versions, but encourage following
1060                         return array( 'index'  => 'noindex',
1061                                       'follow' => 'follow' );
1062                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
1063                         # For ?curid=x urls, disallow indexing
1064                         return array( 'index'  => 'noindex',
1065                                       'follow' => 'follow' );
1066                 }
1067
1068                 # Otherwise, construct the policy based on the various config variables.
1069                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1070
1071                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1072                         # Honour customised robot policies for this namespace
1073                         $policy = array_merge( $policy,
1074                                                self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] ) );
1075                 }
1076                 if ( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
1077                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1078                         # a final sanity check that we have really got the parser output.
1079                         $policy = array_merge( $policy,
1080                                                array( 'index' => $this->mParserOutput->getIndexPolicy() ) );
1081                 }
1082
1083                 if ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
1084                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1085                         $policy = array_merge( $policy,
1086                                                self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) );
1087                 }
1088
1089                 return $policy;
1090
1091         }
1092
1093         /**
1094          * Converts a String robot policy into an associative array, to allow
1095          * merging of several policies using array_merge().
1096          * @param $policy Mixed, returns empty array on null/false/'', transparent
1097          *            to already-converted arrays, converts String.
1098          * @return associative Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1099          */
1100         public static function formatRobotPolicy( $policy ) {
1101                 if ( is_array( $policy ) ) {
1102                         return $policy;
1103                 } elseif ( !$policy ) {
1104                         return array();
1105                 }
1106
1107                 $policy = explode( ',', $policy );
1108                 $policy = array_map( 'trim', $policy );
1109
1110                 $arr = array();
1111                 foreach ( $policy as $var ) {
1112                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
1113                                 $arr['index'] = $var;
1114                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
1115                                 $arr['follow'] = $var;
1116                         }
1117                 }
1118                 return $arr;
1119         }
1120
1121         /**
1122          * If this request is a redirect view, send "redirected from" subtitle to
1123          * $wgOut. Returns true if the header was needed, false if this is not a
1124          * redirect view. Handles both local and remote redirects.
1125          *
1126          * @return boolean
1127          */
1128         public function showRedirectedFromHeader() {
1129                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1130
1131                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1132                 $sk = $wgUser->getSkin();
1133                 if ( isset( $this->mRedirectedFrom ) ) {
1134                         // This is an internally redirected page view.
1135                         // We'll need a backlink to the source page for navigation.
1136                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1137                                 $redir = $sk->link(
1138                                         $this->mRedirectedFrom,
1139                                         null,
1140                                         array(),
1141                                         array( 'redirect' => 'no' ),
1142                                         array( 'known', 'noclasses' )
1143                                 );
1144                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1145                                 $wgOut->setSubtitle( $s );
1146
1147                                 // Set the fragment if one was specified in the redirect
1148                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
1149                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1150                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1151                                 }
1152
1153                                 // Add a <link rel="canonical"> tag
1154                                 $wgOut->addLink( array( 'rel' => 'canonical',
1155                                         'href' => $this->mTitle->getLocalURL() )
1156                                 );
1157                                 return true;
1158                         }
1159                 } elseif ( $rdfrom ) {
1160                         // This is an externally redirected view, from some other wiki.
1161                         // If it was reported from a trusted site, supply a backlink.
1162                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1163                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
1164                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1165                                 $wgOut->setSubtitle( $s );
1166                                 return true;
1167                         }
1168                 }
1169                 return false;
1170         }
1171
1172         /**
1173          * Show a header specific to the namespace currently being viewed, like
1174          * [[MediaWiki:Talkpagetext]]. For Article::view().
1175          */
1176         public function showNamespaceHeader() {
1177                 global $wgOut;
1178                 if ( $this->mTitle->isTalkPage() ) {
1179                         $msg = wfMsgNoTrans( 'talkpageheader' );
1180                         if ( $msg !== '-' && !wfEmptyMsg( 'talkpageheader', $msg ) ) {
1181                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1</div>", array( 'talkpageheader' ) );
1182                         }
1183                 }
1184         }
1185
1186         /**
1187          * Show the footer section of an ordinary page view
1188          */
1189         public function showViewFooter() {
1190                 global $wgOut, $wgUseTrackbacks, $wgRequest;
1191                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1192                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1193                         $wgOut->addWikiMsg( 'anontalkpagetext' );
1194                 }
1195
1196                 # If we have been passed an &rcid= parameter, we want to give the user a
1197                 # chance to mark this new article as patrolled.
1198                 $this->showPatrolFooter();
1199
1200                 # Trackbacks
1201                 if ( $wgUseTrackbacks ) {
1202                         $this->addTrackbacks();
1203                 }
1204         }
1205
1206         /**
1207          * If patrol is possible, output a patrol UI box. This is called from the
1208          * footer section of ordinary page views. If patrol is not possible or not
1209          * desired, does nothing.
1210          */
1211         public function showPatrolFooter() {
1212                 global $wgOut, $wgRequest, $wgUser;
1213                 $rcid = $wgRequest->getVal( 'rcid' );
1214
1215                 if ( !$rcid || !$this->mTitle->exists() || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1216                         return;
1217                 }
1218
1219                 $sk = $wgUser->getSkin();
1220
1221                 $wgOut->addHTML(
1222                         "<div class='patrollink'>" .
1223                                 wfMsgHtml(
1224                                         'markaspatrolledlink',
1225                                         $sk->link(
1226                                                 $this->mTitle,
1227                                                 wfMsgHtml( 'markaspatrolledtext' ),
1228                                                 array(),
1229                                                 array(
1230                                                         'action' => 'markpatrolled',
1231                                                         'rcid' => $rcid
1232                                                 ),
1233                                                 array( 'known', 'noclasses' )
1234                                         )
1235                                 ) .
1236                         '</div>'
1237                 );
1238         }
1239
1240         /**
1241          * Show the error text for a missing article. For articles in the MediaWiki
1242          * namespace, show the default message text. To be called from Article::view().
1243          */
1244         public function showMissingArticle() {
1245                 global $wgOut, $wgRequest, $wgUser;
1246
1247                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1248                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1249                         $parts = explode( '/', $this->mTitle->getText() );
1250                         $rootPart = $parts[0];
1251                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1252                         $ip = User::isIP( $rootPart );
1253                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
1254                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1</div>",
1255                                         array( 'userpage-userdoesnotexist-view', $rootPart ) );
1256                         } else if ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1257                                 LogEventsList::showLogExtract(
1258                                         $wgOut,
1259                                         'block',
1260                                         $user->getUserPage()->getPrefixedText(),
1261                                         '',
1262                                         array(
1263                                                 'lim' => 1,
1264                                                 'showIfEmpty' => false,
1265                                                 'msgKey' => array(
1266                                                         'blocked-notice-logextract',
1267                                                         $user->getName() # Support GENDER in notice
1268                                                 )
1269                                         )
1270                                 );
1271                         }
1272                 }
1273                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1274                 # Show delete and move logs
1275                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1276                         array(  'lim' => 10,
1277                                 'conds' => array( "log_action != 'revision'" ),
1278                                 'showIfEmpty' => false,
1279                                 'msgKey' => array( 'moveddeleted-notice' ) )
1280                 );
1281
1282                 # Show error message
1283                 $oldid = $this->getOldID();
1284                 if ( $oldid ) {
1285                         $text = wfMsgNoTrans( 'missing-article',
1286                                 $this->mTitle->getPrefixedText(),
1287                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1288                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1289                         // Use the default message text
1290                         $text = $this->getContent();
1291                 } else {
1292                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1293                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1294                         $errors = array_merge( $createErrors, $editErrors );
1295
1296                         if ( !count( $errors ) )
1297                                 $text = wfMsgNoTrans( 'noarticletext' );
1298                         else
1299                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1300                 }
1301                 $text = "<div class='noarticletext'>\n$text\n</div>";
1302                 if ( !$this->hasViewableContent() ) {
1303                         // If there's no backing content, send a 404 Not Found
1304                         // for better machine handling of broken links.
1305                         $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
1306                 }
1307                 $wgOut->addWikiText( $text );
1308         }
1309
1310         /**
1311          * If the revision requested for view is deleted, check permissions.
1312          * Send either an error message or a warning header to $wgOut.
1313          *
1314          * @return boolean true if the view is allowed, false if not.
1315          */
1316         public function showDeletedRevisionHeader() {
1317                 global $wgOut, $wgRequest;
1318                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1319                         // Not deleted
1320                         return true;
1321                 }
1322                 // If the user is not allowed to see it...
1323                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1324                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
1325                                 'rev-deleted-text-permission' );
1326                         return false;
1327                 // If the user needs to confirm that they want to see it...
1328                 } else if ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1329                         # Give explanation and add a link to view the revision...
1330                         $oldid = intval( $this->getOldID() );
1331                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1332                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1333                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1334                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
1335                                 array( $msg, $link ) );
1336                         return false;
1337                 // We are allowed to see...
1338                 } else {
1339                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1340                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1341                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", $msg );
1342                         return true;
1343                 }
1344         }
1345
1346         /**
1347          * Should the parser cache be used?
1348          *
1349          * @return boolean
1350          */
1351         public function useParserCache( $oldid ) {
1352                 global $wgUser, $wgEnableParserCache;
1353
1354                 return $wgEnableParserCache
1355                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
1356                         && $this->exists()
1357                         && empty( $oldid )
1358                         && !$this->mTitle->isCssOrJsPage()
1359                         && !$this->mTitle->isCssJsSubpage();
1360         }
1361
1362         /**
1363          * Execute the uncached parse for action=view
1364          */
1365         public function doViewParse() {
1366                 global $wgOut;
1367                 $oldid = $this->getOldID();
1368                 $useParserCache = $this->useParserCache( $oldid );
1369                 $parserOptions = clone $this->getParserOptions();
1370                 # Render printable version, use printable version cache
1371                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1372                 # Don't show section-edit links on old revisions... this way lies madness.
1373                 $parserOptions->setEditSection( $this->isCurrent() );
1374                 $useParserCache = $this->useParserCache( $oldid );
1375                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1376         }
1377
1378         /**
1379          * Try to fetch an expired entry from the parser cache. If it is present,
1380          * output it and return true. If it is not present, output nothing and
1381          * return false. This is used as a callback function for
1382          * PoolCounter::executeProtected().
1383          *
1384          * @return boolean
1385          */
1386         public function tryDirtyCache() {
1387                 global $wgOut;
1388                 $parserCache = ParserCache::singleton();
1389                 $options = $this->getParserOptions();
1390                 $options->setIsPrintable( $wgOut->isPrintable() );
1391                 $output = $parserCache->getDirty( $this, $options );
1392                 if ( $output ) {
1393                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1394                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1395                         $wgOut->setSquidMaxage( 0 );
1396                         $this->mParserOutput = $output;
1397                         $wgOut->addParserOutput( $output );
1398                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1399                         return true;
1400                 } else {
1401                         wfDebugLog( 'dirty', "dirty missing\n" );
1402                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1403                         return false;
1404                 }
1405         }
1406
1407         /**
1408          * Show an error page for an error from the pool counter.
1409          * @param $status Status
1410          */
1411         public function showPoolError( $status ) {
1412                 global $wgOut;
1413                 $wgOut->clearHTML(); // for release() errors
1414                 $wgOut->enableClientCache( false );
1415                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1416                 $wgOut->addWikiText(
1417                         '<div class="errorbox">' .
1418                         $status->getWikiText( false, 'view-pool-error' ) .
1419                         '</div>'
1420                 );
1421         }
1422
1423         /**
1424          * View redirect
1425          *
1426          * @param $target Title object or Array of destination(s) to redirect
1427          * @param $appendSubtitle Boolean [optional]
1428          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1429          * @return string containing HMTL with redirect link
1430          */
1431         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1432                 global $wgOut, $wgContLang, $wgStylePath, $wgUser;
1433                 # Display redirect
1434                 if ( !is_array( $target ) ) {
1435                         $target = array( $target );
1436                 }
1437                 $imageDir = $wgContLang->getDir();
1438                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1439                 $imageUrl2 = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1440                 $alt2 = $wgContLang->isRTL() ? '&larr;' : '&rarr;'; // should -> and <- be used instead of entities?
1441
1442                 if ( $appendSubtitle ) {
1443                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1444                 }
1445                 $sk = $wgUser->getSkin();
1446                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1447                 $title = array_shift( $target );
1448                 if ( $forceKnown ) {
1449                         $link = $sk->link(
1450                                 $title,
1451                                 htmlspecialchars( $title->getFullText() ),
1452                                 array(),
1453                                 array(),
1454                                 array( 'known', 'noclasses' )
1455                         );
1456                 } else {
1457                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1458                 }
1459                 // automatically append redirect=no to each link, since most of them are redirect pages themselves
1460                 foreach ( $target as $rt ) {
1461                         if ( $forceKnown ) {
1462                                 $link .= '<img src="' . $imageUrl2 . '" alt="' . $alt2 . ' " />'
1463                                         . $sk->link(
1464                                                 $rt,
1465                                                 htmlspecialchars( $rt->getFullText() ),
1466                                                 array(),
1467                                                 array(),
1468                                                 array( 'known', 'noclasses' )
1469                                         );
1470                         } else {
1471                                 $link .= '<img src="' . $imageUrl2 . '" alt="' . $alt2 . ' " />'
1472                                         . $sk->link( $rt, htmlspecialchars( $rt->getFullText() ) );
1473                         }
1474                 }
1475                 return '<img src="' . $imageUrl . '" alt="#REDIRECT " />' .
1476                         '<span class="redirectText">' . $link . '</span>';
1477
1478         }
1479
1480         /**
1481          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1482          */
1483         public function addTrackbacks() {
1484                 global $wgOut, $wgUser;
1485                 $dbr = wfGetDB( DB_SLAVE );
1486                 $tbs = $dbr->select( 'trackbacks',
1487                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1488                         array( 'tb_page' => $this->getID() )
1489                 );
1490                 if ( !$dbr->numRows( $tbs ) ) return;
1491
1492                 $tbtext = "";
1493                 while ( $o = $dbr->fetchObject( $tbs ) ) {
1494                         $rmvtxt = "";
1495                         if ( $wgUser->isAllowed( 'trackback' ) ) {
1496                                 $delurl = $this->mTitle->getFullURL( "action=deletetrackback&tbid=" .
1497                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1498                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1499                         }
1500                         $tbtext .= "\n";
1501                         $tbtext .= wfMsg( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1502                                         $o->tb_title,
1503                                         $o->tb_url,
1504                                         $o->tb_ex,
1505                                         $o->tb_name,
1506                                         $rmvtxt );
1507                 }
1508                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>$1</div>\n", array( 'trackbackbox', $tbtext ) );
1509                 $this->mTitle->invalidateCache();
1510         }
1511
1512         /**
1513          * Removes trackback record for current article from trackbacks table
1514          */
1515         public function deletetrackback() {
1516                 global $wgUser, $wgRequest, $wgOut;
1517                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
1518                         $wgOut->addWikiMsg( 'sessionfailure' );
1519                         return;
1520                 }
1521
1522                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1523                 if ( count( $permission_errors ) ) {
1524                         $wgOut->showPermissionsErrorPage( $permission_errors );
1525                         return;
1526                 }
1527
1528                 $db = wfGetDB( DB_MASTER );
1529                 $db->delete( 'trackbacks', array( 'tb_id' => $wgRequest->getInt( 'tbid' ) ) );
1530
1531                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1532                 $this->mTitle->invalidateCache();
1533         }
1534
1535         /**
1536          * Handle action=render
1537          */
1538
1539         public function render() {
1540                 global $wgOut;
1541                 $wgOut->setArticleBodyOnly( true );
1542                 $this->view();
1543         }
1544
1545         /**
1546          * Handle action=purge
1547          */
1548         public function purge() {
1549                 global $wgUser, $wgRequest, $wgOut;
1550                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1551                         if ( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1552                                 $this->doPurge();
1553                                 $this->view();
1554                         }
1555                 } else {
1556                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1557                         $button = wfMsgExt( 'confirm_purge_button', array( 'escapenoentities' ) );
1558                         $form = "<form method=\"post\" action=\"$action\">\n" .
1559                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1560                                         "</form>\n";
1561                         $top = wfMsgExt( 'confirm-purge-top', array( 'parse' ) );
1562                         $bottom = wfMsgExt( 'confirm-purge-bottom', array( 'parse' ) );
1563                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1564                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1565                         $wgOut->addHTML( $top . $form . $bottom );
1566                 }
1567         }
1568
1569         /**
1570          * Perform the actions of a page purging
1571          */
1572         public function doPurge() {
1573                 global $wgUseSquid;
1574                 // Invalidate the cache
1575                 $this->mTitle->invalidateCache();
1576
1577                 if ( $wgUseSquid ) {
1578                         // Commit the transaction before the purge is sent
1579                         $dbw = wfGetDB( DB_MASTER );
1580                         $dbw->commit();
1581
1582                         // Send purge
1583                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1584                         $update->doUpdate();
1585                 }
1586                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1587                         global $wgMessageCache;
1588                         if ( $this->getID() == 0 ) {
1589                                 $text = false;
1590                         } else {
1591                                 $text = $this->getRawText();
1592                         }
1593                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1594                 }
1595         }
1596
1597         /**
1598          * Insert a new empty page record for this article.
1599          * This *must* be followed up by creating a revision
1600          * and running $this->updateToLatest( $rev_id );
1601          * or else the record will be left in a funky state.
1602          * Best if all done inside a transaction.
1603          *
1604          * @param $dbw Database
1605          * @return int The newly created page_id key, or false if the title already existed
1606          * @private
1607          */
1608         public function insertOn( $dbw ) {
1609                 wfProfileIn( __METHOD__ );
1610
1611                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1612                 $dbw->insert( 'page', array(
1613                         'page_id'           => $page_id,
1614                         'page_namespace'    => $this->mTitle->getNamespace(),
1615                         'page_title'        => $this->mTitle->getDBkey(),
1616                         'page_counter'      => 0,
1617                         'page_restrictions' => '',
1618                         'page_is_redirect'  => 0, # Will set this shortly...
1619                         'page_is_new'       => 1,
1620                         'page_random'       => wfRandom(),
1621                         'page_touched'      => $dbw->timestamp(),
1622                         'page_latest'       => 0, # Fill this in shortly...
1623                         'page_len'          => 0, # Fill this in shortly...
1624                 ), __METHOD__, 'IGNORE' );
1625
1626                 $affected = $dbw->affectedRows();
1627                 if ( $affected ) {
1628                         $newid = $dbw->insertId();
1629                         $this->mTitle->resetArticleId( $newid );
1630                 }
1631                 wfProfileOut( __METHOD__ );
1632                 return $affected ? $newid : false;
1633         }
1634
1635         /**
1636          * Update the page record to point to a newly saved revision.
1637          *
1638          * @param $dbw Database object
1639          * @param $revision Revision: For ID number, and text used to set
1640                             length and redirect status fields
1641          * @param $lastRevision Integer: if given, will not overwrite the page field
1642          *                      when different from the currently set value.
1643          *                      Giving 0 indicates the new page flag should be set
1644          *                      on.
1645          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1646          *                           removing rows in redirect table.
1647          * @return bool true on success, false on failure
1648          * @private
1649          */
1650         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1651                 wfProfileIn( __METHOD__ );
1652
1653                 $text = $revision->getText();
1654                 $rt = Title::newFromRedirect( $text );
1655
1656                 $conditions = array( 'page_id' => $this->getId() );
1657                 if ( !is_null( $lastRevision ) ) {
1658                         # An extra check against threads stepping on each other
1659                         $conditions['page_latest'] = $lastRevision;
1660                 }
1661
1662                 $dbw->update( 'page',
1663                         array( /* SET */
1664                                 'page_latest'      => $revision->getId(),
1665                                 'page_touched'     => $dbw->timestamp(),
1666                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1667                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1668                                 'page_len'         => strlen( $text ),
1669                         ),
1670                         $conditions,
1671                         __METHOD__ );
1672
1673                 $result = $dbw->affectedRows() != 0;
1674                 if ( $result ) {
1675                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1676                 }
1677
1678                 wfProfileOut( __METHOD__ );
1679                 return $result;
1680         }
1681
1682         /**
1683          * Add row to the redirect table if this is a redirect, remove otherwise.
1684          *
1685          * @param $dbw Database
1686          * @param $redirectTitle a title object pointing to the redirect target,
1687          *                       or NULL if this is not a redirect
1688          * @param $lastRevIsRedirect If given, will optimize adding and
1689          *                           removing rows in redirect table.
1690          * @return bool true on success, false on failure
1691          * @private
1692          */
1693         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1694                 // Always update redirects (target link might have changed)
1695                 // Update/Insert if we don't know if the last revision was a redirect or not
1696                 // Delete if changing from redirect to non-redirect
1697                 $isRedirect = !is_null( $redirectTitle );
1698                 if ( $isRedirect || is_null( $lastRevIsRedirect ) || $lastRevIsRedirect !== $isRedirect ) {
1699                         wfProfileIn( __METHOD__ );
1700                         if ( $isRedirect ) {
1701                                 // This title is a redirect, Add/Update row in the redirect table
1702                                 $set = array( /* SET */
1703                                         'rd_namespace' => $redirectTitle->getNamespace(),
1704                                         'rd_title'     => $redirectTitle->getDBkey(),
1705                                         'rd_from'      => $this->getId(),
1706                                 );
1707                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1708                         } else {
1709                                 // This is not a redirect, remove row from redirect table
1710                                 $where = array( 'rd_from' => $this->getId() );
1711                                 $dbw->delete( 'redirect', $where, __METHOD__ );
1712                         }
1713                         if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1714                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1715                         }
1716                         wfProfileOut( __METHOD__ );
1717                         return ( $dbw->affectedRows() != 0 );
1718                 }
1719                 return true;
1720         }
1721
1722         /**
1723          * If the given revision is newer than the currently set page_latest,
1724          * update the page record. Otherwise, do nothing.
1725          *
1726          * @param $dbw Database object
1727          * @param $revision Revision object
1728          * @return mixed
1729          */
1730         public function updateIfNewerOn( &$dbw, $revision ) {
1731                 wfProfileIn( __METHOD__ );
1732                 $row = $dbw->selectRow(
1733                         array( 'revision', 'page' ),
1734                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1735                         array(
1736                                 'page_id' => $this->getId(),
1737                                 'page_latest=rev_id' ),
1738                         __METHOD__ );
1739                 if ( $row ) {
1740                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1741                                 wfProfileOut( __METHOD__ );
1742                                 return false;
1743                         }
1744                         $prev = $row->rev_id;
1745                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1746                 } else {
1747                         # No or missing previous revision; mark the page as new
1748                         $prev = 0;
1749                         $lastRevIsRedirect = null;
1750                 }
1751                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1752                 wfProfileOut( __METHOD__ );
1753                 return $ret;
1754         }
1755
1756         /**
1757          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1758          * @return string Complete article text, or null if error
1759          */
1760         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1761                 wfProfileIn( __METHOD__ );
1762                 if ( strval( $section ) == '' ) {
1763                         // Whole-page edit; let the whole text through
1764                 } else {
1765                         if ( is_null( $edittime ) ) {
1766                                 $rev = Revision::newFromTitle( $this->mTitle );
1767                         } else {
1768                                 $dbw = wfGetDB( DB_MASTER );
1769                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1770                         }
1771                         if ( !$rev ) {
1772                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1773                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1774                                 return null;
1775                         }
1776                         $oldtext = $rev->getText();
1777
1778                         if ( $section == 'new' ) {
1779                                 # Inserting a new section
1780                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1781                                 $text = strlen( trim( $oldtext ) ) > 0
1782                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1783                                                 : "{$subject}{$text}";
1784                         } else {
1785                                 # Replacing an existing section; roll out the big guns
1786                                 global $wgParser;
1787                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1788                         }
1789                 }
1790                 wfProfileOut( __METHOD__ );
1791                 return $text;
1792         }
1793
1794         /**
1795          * This function is not deprecated until somebody fixes the core not to use
1796          * it. Nevertheless, use Article::doEdit() instead.
1797          */
1798         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC = false, $comment = false, $bot = false ) {
1799                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1800                         ( $isminor ? EDIT_MINOR : 0 ) |
1801                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1802                         ( $bot ? EDIT_FORCE_BOT : 0 );
1803
1804                 # If this is a comment, add the summary as headline
1805                 if ( $comment && $summary != "" ) {
1806                         $text = wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" . $text;
1807                 }
1808
1809                 $this->doEdit( $text, $summary, $flags );
1810
1811                 $dbw = wfGetDB( DB_MASTER );
1812                 if ( $watchthis ) {
1813                         if ( !$this->mTitle->userIsWatching() ) {
1814                                 $dbw->begin();
1815                                 $this->doWatch();
1816                                 $dbw->commit();
1817                         }
1818                 } else {
1819                         if ( $this->mTitle->userIsWatching() ) {
1820                                 $dbw->begin();
1821                                 $this->doUnwatch();
1822                                 $dbw->commit();
1823                         }
1824                 }
1825                 $this->doRedirect( $this->isRedirect( $text ) );
1826         }
1827
1828         /**
1829          * @deprecated use Article::doEdit()
1830          */
1831         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1832                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1833                         ( $minor ? EDIT_MINOR : 0 ) |
1834                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1835
1836                 $status = $this->doEdit( $text, $summary, $flags );
1837                 if ( !$status->isOK() ) {
1838                         return false;
1839                 }
1840
1841                 $dbw = wfGetDB( DB_MASTER );
1842                 if ( $watchthis ) {
1843                         if ( !$this->mTitle->userIsWatching() ) {
1844                                 $dbw->begin();
1845                                 $this->doWatch();
1846                                 $dbw->commit();
1847                         }
1848                 } else {
1849                         if ( $this->mTitle->userIsWatching() ) {
1850                                 $dbw->begin();
1851                                 $this->doUnwatch();
1852                                 $dbw->commit();
1853                         }
1854                 }
1855
1856                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1857                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1858
1859                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1860                 return true;
1861         }
1862
1863         /**
1864          * Article::doEdit()
1865          *
1866          * Change an existing article or create a new article. Updates RC and all necessary caches,
1867          * optionally via the deferred update array.
1868          *
1869          * $wgUser must be set before calling this function.
1870          *
1871          * @param $text String: new text
1872          * @param $summary String: edit summary
1873          * @param $flags Integer bitfield:
1874          *      EDIT_NEW
1875          *          Article is known or assumed to be non-existent, create a new one
1876          *      EDIT_UPDATE
1877          *          Article is known or assumed to be pre-existing, update it
1878          *      EDIT_MINOR
1879          *          Mark this edit minor, if the user is allowed to do so
1880          *      EDIT_SUPPRESS_RC
1881          *          Do not log the change in recentchanges
1882          *      EDIT_FORCE_BOT
1883          *          Mark the edit a "bot" edit regardless of user rights
1884          *      EDIT_DEFER_UPDATES
1885          *          Defer some of the updates until the end of index.php
1886          *      EDIT_AUTOSUMMARY
1887          *          Fill in blank summaries with generated text where possible
1888          *
1889          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1890          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1891          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1892          * edit-already-exists error will be returned. These two conditions are also possible with
1893          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1894          *
1895          * @param $baseRevId the revision ID this edit was based off, if any
1896          * @param $user Optional user object, $wgUser will be used if not passed
1897          *
1898          * @return Status object. Possible errors:
1899          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1900          *     edit-gone-missing:       In update mode, but the article didn't exist
1901          *     edit-conflict:           In update mode, the article changed unexpectedly
1902          *     edit-no-change:          Warning that the text was the same as before
1903          *     edit-already-exists:     In creation mode, but the article already exists
1904          *
1905          *  Extensions may define additional errors.
1906          *
1907          *  $return->value will contain an associative array with members as follows:
1908          *     new:                     Boolean indicating if the function attempted to create a new article
1909          *     revision:                The revision object for the inserted revision, or null
1910          *
1911          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1912          */
1913         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1914                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1915
1916                 # Low-level sanity check
1917                 if ( $this->mTitle->getText() == '' ) {
1918                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1919                 }
1920
1921                 wfProfileIn( __METHOD__ );
1922
1923                 $user = is_null( $user ) ? $wgUser : $user;
1924                 $status = Status::newGood( array() );
1925
1926                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1927                 $this->loadPageData();
1928
1929                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1930                         $aid = $this->mTitle->getArticleID();
1931                         if ( $aid ) {
1932                                 $flags |= EDIT_UPDATE;
1933                         } else {
1934                                 $flags |= EDIT_NEW;
1935                         }
1936                 }
1937
1938                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1939                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1940                 {
1941                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1942                         wfProfileOut( __METHOD__ );
1943                         if ( $status->isOK() ) {
1944                                 $status->fatal( 'edit-hook-aborted' );
1945                         }
1946                         return $status;
1947                 }
1948
1949                 # Silently ignore EDIT_MINOR if not allowed
1950                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1951                 $bot = $flags & EDIT_FORCE_BOT;
1952
1953                 $oldtext = $this->getRawText(); // current revision
1954                 $oldsize = strlen( $oldtext );
1955
1956                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1957                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1958                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1959                 }
1960
1961                 $editInfo = $this->prepareTextForEdit( $text );
1962                 $text = $editInfo->pst;
1963                 $newsize = strlen( $text );
1964
1965                 $dbw = wfGetDB( DB_MASTER );
1966                 $now = wfTimestampNow();
1967                 $this->mTimestamp = $now;
1968
1969                 if ( $flags & EDIT_UPDATE ) {
1970                         # Update article, but only if changed.
1971                         $status->value['new'] = false;
1972                         # Make sure the revision is either completely inserted or not inserted at all
1973                         if ( !$wgDBtransactions ) {
1974                                 $userAbort = ignore_user_abort( true );
1975                         }
1976
1977                         $revisionId = 0;
1978
1979                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1980
1981                         if ( $changed ) {
1982                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1983                                   - (int)$this->isCountable( $oldtext );
1984                                 $this->mTotalAdjustment = 0;
1985
1986                                 if ( !$this->mLatest ) {
1987                                         # Article gone missing
1988                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1989                                         $status->fatal( 'edit-gone-missing' );
1990                                         wfProfileOut( __METHOD__ );
1991                                         return $status;
1992                                 }
1993
1994                                 $revision = new Revision( array(
1995                                         'page'       => $this->getId(),
1996                                         'comment'    => $summary,
1997                                         'minor_edit' => $isminor,
1998                                         'text'       => $text,
1999                                         'parent_id'  => $this->mLatest,
2000                                         'user'       => $user->getId(),
2001                                         'user_text'  => $user->getName(),
2002                                         ) );
2003
2004                                 $dbw->begin();
2005                                 $revisionId = $revision->insertOn( $dbw );
2006
2007                                 # Update page
2008                                 #
2009                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
2010                                 # during the course of this function. This makes sure that EditPage can detect
2011                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
2012                                 # before this function is called. A previous function used a separate query, this
2013                                 # creates a window where concurrent edits can cause an ignored edit conflict.
2014                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
2015
2016                                 if ( !$ok ) {
2017                                         /* Belated edit conflict! Run away!! */
2018                                         $status->fatal( 'edit-conflict' );
2019                                         # Delete the invalid revision if the DB is not transactional
2020                                         if ( !$wgDBtransactions ) {
2021                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
2022                                         }
2023                                         $revisionId = 0;
2024                                         $dbw->rollback();
2025                                 } else {
2026                                         global $wgUseRCPatrol;
2027                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
2028                                         # Update recentchanges
2029                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2030                                                 # Mark as patrolled if the user can do so
2031                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan( 'autopatrol' );
2032                                                 # Add RC row to the DB
2033                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
2034                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
2035                                                         $revisionId, $patrolled
2036                                                 );
2037                                                 # Log auto-patrolled edits
2038                                                 if ( $patrolled ) {
2039                                                         PatrolLog::record( $rc, true );
2040                                                 }
2041                                         }
2042                                         $user->incEditCount();
2043                                         $dbw->commit();
2044                                 }
2045                         } else {
2046                                 $status->warning( 'edit-no-change' );
2047                                 $revision = null;
2048                                 // Keep the same revision ID, but do some updates on it
2049                                 $revisionId = $this->getRevIdFetched();
2050                                 // Update page_touched, this is usually implicit in the page update
2051                                 // Other cache updates are done in onArticleEdit()
2052                                 $this->mTitle->invalidateCache();
2053                         }
2054
2055                         if ( !$wgDBtransactions ) {
2056                                 ignore_user_abort( $userAbort );
2057                         }
2058                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2059                         if ( !$status->isOK() ) {
2060                                 wfProfileOut( __METHOD__ );
2061                                 return $status;
2062                         }
2063
2064                         # Invalidate cache of this article and all pages using this article
2065                         # as a template. Partly deferred.
2066                         Article::onArticleEdit( $this->mTitle );
2067                         # Update links tables, site stats, etc.
2068                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
2069                 } else {
2070                         # Create new article
2071                         $status->value['new'] = true;
2072
2073                         # Set statistics members
2074                         # We work out if it's countable after PST to avoid counter drift
2075                         # when articles are created with {{subst:}}
2076                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2077                         $this->mTotalAdjustment = 1;
2078
2079                         $dbw->begin();
2080
2081                         # Add the page record; stake our claim on this title!
2082                         # This will return false if the article already exists
2083                         $newid = $this->insertOn( $dbw );
2084
2085                         if ( $newid === false ) {
2086                                 $dbw->rollback();
2087                                 $status->fatal( 'edit-already-exists' );
2088                                 wfProfileOut( __METHOD__ );
2089                                 return $status;
2090                         }
2091
2092                         # Save the revision text...
2093                         $revision = new Revision( array(
2094                                 'page'       => $newid,
2095                                 'comment'    => $summary,
2096                                 'minor_edit' => $isminor,
2097                                 'text'       => $text,
2098                                 'user'       => $user->getId(),
2099                                 'user_text'  => $user->getName(),
2100                                 ) );
2101                         $revisionId = $revision->insertOn( $dbw );
2102
2103                         $this->mTitle->resetArticleID( $newid );
2104
2105                         # Update the page record with revision data
2106                         $this->updateRevisionOn( $dbw, $revision, 0 );
2107
2108                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2109                         # Update recentchanges
2110                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2111                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2112                                 # Mark as patrolled if the user can do so
2113                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && $this->mTitle->userCan( 'autopatrol' );
2114                                 # Add RC row to the DB
2115                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2116                                         '', strlen( $text ), $revisionId, $patrolled );
2117                                 # Log auto-patrolled edits
2118                                 if ( $patrolled ) {
2119                                         PatrolLog::record( $rc, true );
2120                                 }
2121                         }
2122                         $user->incEditCount();
2123                         $dbw->commit();
2124
2125                         # Update links, etc.
2126                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
2127
2128                         # Clear caches
2129                         Article::onArticleCreate( $this->mTitle );
2130
2131                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2132                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
2133                 }
2134
2135                 # Do updates right now unless deferral was requested
2136                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2137                         wfDoUpdates();
2138                 }
2139
2140                 // Return the new revision (or null) to the caller
2141                 $status->value['revision'] = $revision;
2142
2143                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2144                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
2145
2146                 wfProfileOut( __METHOD__ );
2147                 return $status;
2148         }
2149
2150         /**
2151          * @deprecated wrapper for doRedirect
2152          */
2153         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
2154                 wfDeprecated( __METHOD__ );
2155                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
2156         }
2157
2158         /**
2159          * Output a redirect back to the article.
2160          * This is typically used after an edit.
2161          *
2162          * @param $noRedir Boolean: add redirect=no
2163          * @param $sectionAnchor String: section to redirect to, including "#"
2164          * @param $extraQuery String: extra query params
2165          */
2166         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2167                 global $wgOut;
2168                 if ( $noRedir ) {
2169                         $query = 'redirect=no';
2170                         if ( $extraQuery )
2171                                 $query .= "&$query";
2172                 } else {
2173                         $query = $extraQuery;
2174                 }
2175                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2176         }
2177
2178         /**
2179          * Mark this particular edit/page as patrolled
2180          */
2181         public function markpatrolled() {
2182                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
2183                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2184
2185                 # If we haven't been given an rc_id value, we can't do anything
2186                 $rcid = (int) $wgRequest->getVal( 'rcid' );
2187                 $rc = RecentChange::newFromId( $rcid );
2188                 if ( is_null( $rc ) ) {
2189                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2190                         return;
2191                 }
2192
2193                 # It would be nice to see where the user had actually come from, but for now just guess
2194                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2195                 $return = SpecialPage::getTitleFor( $returnto );
2196
2197                 $dbw = wfGetDB( DB_MASTER );
2198                 $errors = $rc->doMarkPatrolled();
2199
2200                 if ( in_array( array( 'rcpatroldisabled' ), $errors ) ) {
2201                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2202                         return;
2203                 }
2204
2205                 if ( in_array( array( 'hookaborted' ), $errors ) ) {
2206                         // The hook itself has handled any output
2207                         return;
2208                 }
2209
2210                 if ( in_array( array( 'markedaspatrollederror-noautopatrol' ), $errors ) ) {
2211                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2212                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2213                         $wgOut->returnToMain( false, $return );
2214                         return;
2215                 }
2216
2217                 if ( !empty( $errors ) ) {
2218                         $wgOut->showPermissionsErrorPage( $errors );
2219                         return;
2220                 }
2221
2222                 # Inform the user
2223                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2224                 $wgOut->addWikiMsg( 'markedaspatrolledtext', $rc->getTitle()->getPrefixedText() );
2225                 $wgOut->returnToMain( false, $return );
2226         }
2227
2228         /**
2229          * User-interface handler for the "watch" action
2230          */
2231         public function watch() {
2232                 global $wgUser, $wgOut;
2233                 if ( $wgUser->isAnon() ) {
2234                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2235                         return;
2236                 }
2237                 if ( wfReadOnly() ) {
2238                         $wgOut->readOnlyPage();
2239                         return;
2240                 }
2241                 if ( $this->doWatch() ) {
2242                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
2243                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2244                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
2245                 }
2246                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2247         }
2248
2249         /**
2250          * Add this page to $wgUser's watchlist
2251          * @return bool true on successful watch operation
2252          */
2253         public function doWatch() {
2254                 global $wgUser;
2255                 if ( $wgUser->isAnon() ) {
2256                         return false;
2257                 }
2258                 if ( wfRunHooks( 'WatchArticle', array( &$wgUser, &$this ) ) ) {
2259                         $wgUser->addWatch( $this->mTitle );
2260                         return wfRunHooks( 'WatchArticleComplete', array( &$wgUser, &$this ) );
2261                 }
2262                 return false;
2263         }
2264
2265         /**
2266          * User interface handler for the "unwatch" action.
2267          */
2268         public function unwatch() {
2269                 global $wgUser, $wgOut;
2270                 if ( $wgUser->isAnon() ) {
2271                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2272                         return;
2273                 }
2274                 if ( wfReadOnly() ) {
2275                         $wgOut->readOnlyPage();
2276                         return;
2277                 }
2278                 if ( $this->doUnwatch() ) {
2279                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
2280                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2281                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
2282                 }
2283                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2284         }
2285
2286         /**
2287          * Stop watching a page
2288          * @return bool true on successful unwatch
2289          */
2290         public function doUnwatch() {
2291                 global $wgUser;
2292                 if ( $wgUser->isAnon() ) {
2293                         return false;
2294                 }
2295                 if ( wfRunHooks( 'UnwatchArticle', array( &$wgUser, &$this ) ) ) {
2296                         $wgUser->removeWatch( $this->mTitle );
2297                         return wfRunHooks( 'UnwatchArticleComplete', array( &$wgUser, &$this ) );
2298                 }
2299                 return false;
2300         }
2301
2302         /**
2303          * action=protect handler
2304          */
2305         public function protect() {
2306                 $form = new ProtectionForm( $this );
2307                 $form->execute();
2308         }
2309
2310         /**
2311          * action=unprotect handler (alias)
2312          */
2313         public function unprotect() {
2314                 $this->protect();
2315         }
2316
2317         /**
2318          * Update the article's restriction field, and leave a log entry.
2319          *
2320          * @param $limit Array: set of restriction keys
2321          * @param $reason String
2322          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2323          * @param $expiry Array: per restriction type expiration
2324          * @return bool true on success
2325          */
2326         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2327                 global $wgUser, $wgContLang;
2328
2329                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2330
2331                 $id = $this->mTitle->getArticleID();
2332                 if ( $id <= 0 ) {
2333                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
2334                         return false;
2335                 }
2336
2337                 if ( wfReadOnly() ) {
2338                         wfDebug( "updateRestrictions failed: read-only\n" );
2339                         return false;
2340                 }
2341
2342                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2343                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2344                         return false;
2345                 }
2346
2347                 if ( !$cascade ) {
2348                         $cascade = false;
2349                 }
2350
2351                 // Take this opportunity to purge out expired restrictions
2352                 Title::purgeExpiredRestrictions();
2353
2354                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2355                 # we expect a single selection, but the schema allows otherwise.
2356                 $current = array();
2357                 $updated = Article::flattenRestrictions( $limit );
2358                 $changed = false;
2359                 foreach ( $restrictionTypes as $action ) {
2360                         if ( isset( $expiry[$action] ) ) {
2361                                 # Get current restrictions on $action
2362                                 $aLimits = $this->mTitle->getRestrictions( $action );
2363                                 $current[$action] = implode( '', $aLimits );
2364                                 # Are any actual restrictions being dealt with here?
2365                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
2366                                 # If something changed, we need to log it. Checking $aRChanged
2367                                 # assures that "unprotecting" a page that is not protected does
2368                                 # not log just because the expiry was "changed".
2369                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2370                                         $changed = true;
2371                                 }
2372                         }
2373                 }
2374
2375                 $current = Article::flattenRestrictions( $current );
2376
2377                 $changed = ( $changed || $current != $updated );
2378                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
2379                 $protect = ( $updated != '' );
2380
2381                 # If nothing's changed, do nothing
2382                 if ( $changed ) {
2383                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2384
2385                                 $dbw = wfGetDB( DB_MASTER );
2386
2387                                 # Prepare a null revision to be added to the history
2388                                 $modified = $current != '' && $protect;
2389                                 if ( $protect ) {
2390                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2391                                 } else {
2392                                         $comment_type = 'unprotectedarticle';
2393                                 }
2394                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2395
2396                                 # Only restrictions with the 'protect' right can cascade...
2397                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2398                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2399                                 # The schema allows multiple restrictions
2400                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) )
2401                                         $cascade = false;
2402                                 $cascade_description = '';
2403                                 if ( $cascade ) {
2404                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2405                                 }
2406
2407                                 if ( $reason )
2408                                         $comment .= ": $reason";
2409
2410                                 $editComment = $comment;
2411                                 $encodedExpiry = array();
2412                                 $protect_description = '';
2413                                 foreach ( $limit as $action => $restrictions  ) {
2414                                         if ( !isset( $expiry[$action] ) )
2415                                                 $expiry[$action] = 'infinite';
2416
2417                                         $encodedExpiry[$action] = Block::encodeExpiry( $expiry[$action], $dbw );
2418                                         if ( $restrictions != '' ) {
2419                                                 $protect_description .= "[$action=$restrictions] (";
2420                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2421                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2422                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2423                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2424                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2425                                                 } else {
2426                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2427                                                 }
2428                                                 $protect_description .= ') ';
2429                                         }
2430                                 }
2431                                 $protect_description = trim( $protect_description );
2432
2433                                 if ( $protect_description && $protect )
2434                                         $editComment .= " ($protect_description)";
2435                                 if ( $cascade )
2436                                         $editComment .= "$cascade_description";
2437                                 # Update restrictions table
2438                                 foreach ( $limit as $action => $restrictions ) {
2439                                         if ( $restrictions != '' ) {
2440                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2441                                                         array( 'pr_page' => $id,
2442                                                                 'pr_type' => $action,
2443                                                                 'pr_level' => $restrictions,
2444                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2445                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
2446                                         } else {
2447                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2448                                                         'pr_type' => $action ), __METHOD__ );
2449                                         }
2450                                 }
2451
2452                                 # Insert a null revision
2453                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2454                                 $nullRevId = $nullRevision->insertOn( $dbw );
2455
2456                                 $latest = $this->getLatest();
2457                                 # Update page record
2458                                 $dbw->update( 'page',
2459                                         array( /* SET */
2460                                                 'page_touched' => $dbw->timestamp(),
2461                                                 'page_restrictions' => '',
2462                                                 'page_latest' => $nullRevId
2463                                         ), array( /* WHERE */
2464                                                 'page_id' => $id
2465                                         ), 'Article::protect'
2466                                 );
2467
2468                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
2469                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2470
2471                                 # Update the protection log
2472                                 $log = new LogPage( 'protect' );
2473                                 if ( $protect ) {
2474                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
2475                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
2476                                 } else {
2477                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2478                                 }
2479
2480                         } # End hook
2481                 } # End "changed" check
2482
2483                 return true;
2484         }
2485
2486         /**
2487          * Take an array of page restrictions and flatten it to a string
2488          * suitable for insertion into the page_restrictions field.
2489          * @param $limit Array
2490          * @return String
2491          */
2492         protected static function flattenRestrictions( $limit ) {
2493                 if ( !is_array( $limit ) ) {
2494                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2495                 }
2496                 $bits = array();
2497                 ksort( $limit );
2498                 foreach ( $limit as $action => $restrictions ) {
2499                         if ( $restrictions != '' ) {
2500                                 $bits[] = "$action=$restrictions";
2501                         }
2502                 }
2503                 return implode( ':', $bits );
2504         }
2505
2506         /**
2507          * Auto-generates a deletion reason
2508          *
2509          * @param &$hasHistory Boolean: whether the page has a history
2510          * @return mixed String containing deletion reason or empty string, or boolean false
2511          *    if no revision occurred
2512          */
2513         public function generateReason( &$hasHistory ) {
2514                 global $wgContLang;
2515                 $dbw = wfGetDB( DB_MASTER );
2516                 // Get the last revision
2517                 $rev = Revision::newFromTitle( $this->mTitle );
2518                 if ( is_null( $rev ) )
2519                         return false;
2520
2521                 // Get the article's contents
2522                 $contents = $rev->getText();
2523                 $blank = false;
2524                 // If the page is blank, use the text from the previous revision,
2525                 // which can only be blank if there's a move/import/protect dummy revision involved
2526                 if ( $contents == '' ) {
2527                         $prev = $rev->getPrevious();
2528                         if ( $prev )    {
2529                                 $contents = $prev->getText();
2530                                 $blank = true;
2531                         }
2532                 }
2533
2534                 // Find out if there was only one contributor
2535                 // Only scan the last 20 revisions
2536                 $res = $dbw->select( 'revision', 'rev_user_text',
2537                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2538                         __METHOD__,
2539                         array( 'LIMIT' => 20 )
2540                 );
2541                 if ( $res === false )
2542                         // This page has no revisions, which is very weird
2543                         return false;
2544
2545                 $hasHistory = ( $res->numRows() > 1 );
2546                 $row = $dbw->fetchObject( $res );
2547                 $onlyAuthor = $row->rev_user_text;
2548                 // Try to find a second contributor
2549                 foreach ( $res as $row ) {
2550                         if ( $row->rev_user_text != $onlyAuthor ) {
2551                                 $onlyAuthor = false;
2552                                 break;
2553                         }
2554                 }
2555                 $dbw->freeResult( $res );
2556
2557                 // Generate the summary with a '$1' placeholder
2558                 if ( $blank ) {
2559                         // The current revision is blank and the one before is also
2560                         // blank. It's just not our lucky day
2561                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2562                 } else {
2563                         if ( $onlyAuthor )
2564                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2565                         else
2566                                 $reason = wfMsgForContent( 'excontent', '$1' );
2567                 }
2568
2569                 if ( $reason == '-' ) {
2570                         // Allow these UI messages to be blanked out cleanly
2571                         return '';
2572                 }
2573
2574                 // Replace newlines with spaces to prevent uglyness
2575                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2576                 // Calculate the maximum amount of chars to get
2577                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2578                 $maxLength = 255 - ( strlen( $reason ) - 2 ) - 3;
2579                 $contents = $wgContLang->truncate( $contents, $maxLength );
2580                 // Remove possible unfinished links
2581                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2582                 // Now replace the '$1' placeholder
2583                 $reason = str_replace( '$1', $contents, $reason );
2584                 return $reason;
2585         }
2586
2587
2588         /*
2589          * UI entry point for page deletion
2590          */
2591         public function delete() {
2592                 global $wgUser, $wgOut, $wgRequest;
2593
2594                 $confirm = $wgRequest->wasPosted() &&
2595                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2596
2597                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2598                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2599
2600                 $reason = $this->DeleteReasonList;
2601
2602                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
2603                         // Entry from drop down menu + additional comment
2604                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2605                 } elseif ( $reason == 'other' ) {
2606                         $reason = $this->DeleteReason;
2607                 }
2608                 # Flag to hide all contents of the archived revisions
2609                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2610
2611                 # This code desperately needs to be totally rewritten
2612
2613                 # Read-only check...
2614                 if ( wfReadOnly() ) {
2615                         $wgOut->readOnlyPage();
2616                         return;
2617                 }
2618
2619                 # Check permissions
2620                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2621
2622                 if ( count( $permission_errors ) > 0 ) {
2623                         $wgOut->showPermissionsErrorPage( $permission_errors );
2624                         return;
2625                 }
2626
2627                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2628
2629                 # Better double-check that it hasn't been deleted yet!
2630                 $dbw = wfGetDB( DB_MASTER );
2631                 $conds = $this->mTitle->pageCond();
2632                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2633                 if ( $latest === false ) {
2634                         $wgOut->showFatalError(
2635                                 Html::rawElement(
2636                                         'div',
2637                                         array( 'class' => 'error mw-error-cannotdelete' ),
2638                                         wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2639                                 )
2640                         );
2641                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2642                         LogEventsList::showLogExtract(
2643                                 $wgOut,
2644                                 'delete',
2645                                 $this->mTitle->getPrefixedText()
2646                         );
2647                         return;
2648                 }
2649
2650                 # Hack for big sites
2651                 $bigHistory = $this->isBigDeletion();
2652                 if ( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2653                         global $wgLang, $wgDeleteRevisionsLimit;
2654                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2655                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2656                         return;
2657                 }
2658
2659                 if ( $confirm ) {
2660                         $this->doDelete( $reason, $suppress );
2661                         if ( $wgRequest->getCheck( 'wpWatch' ) && $wgUser->isLoggedIn() ) {
2662                                 $this->doWatch();
2663                         } elseif ( $this->mTitle->userIsWatching() ) {
2664                                 $this->doUnwatch();
2665                         }
2666                         return;
2667                 }
2668
2669                 // Generate deletion reason
2670                 $hasHistory = false;
2671                 if ( !$reason ) $reason = $this->generateReason( $hasHistory );
2672
2673                 // If the page has a history, insert a warning
2674                 if ( $hasHistory && !$confirm ) {
2675                         global $wgLang;
2676                         $skin = $wgUser->getSkin();
2677                         $revisions = $this->estimateRevisionCount();
2678                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
2679                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
2680                                 wfMsgHtml( 'word-separator' ) . $skin->historyLink() .
2681                                 '</strong>'
2682                         );
2683                         if ( $bigHistory ) {
2684                                 global $wgDeleteRevisionsLimit;
2685                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2686                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2687                         }
2688                 }
2689
2690                 return $this->confirmDelete( $reason );
2691         }
2692
2693         /**
2694          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2695          */
2696         public function isBigDeletion() {
2697                 global $wgDeleteRevisionsLimit;
2698                 if ( $wgDeleteRevisionsLimit ) {
2699                         $revCount = $this->estimateRevisionCount();
2700                         return $revCount > $wgDeleteRevisionsLimit;
2701                 }
2702                 return false;
2703         }
2704
2705         /**
2706          * @return int approximate revision count
2707          */
2708         public function estimateRevisionCount() {
2709                 $dbr = wfGetDB( DB_SLAVE );
2710                 // For an exact count...
2711                 // return $dbr->selectField( 'revision', 'COUNT(*)',
2712                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2713                 return $dbr->estimateRowCount( 'revision', '*',
2714                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2715         }
2716
2717         /**
2718          * Get the last N authors
2719          * @param $num Integer: number of revisions to get
2720          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2721          * @return array Array of authors, duplicates not removed
2722          */
2723         public function getLastNAuthors( $num, $revLatest = 0 ) {
2724                 wfProfileIn( __METHOD__ );
2725                 // First try the slave
2726                 // If that doesn't have the latest revision, try the master
2727                 $continue = 2;
2728                 $db = wfGetDB( DB_SLAVE );
2729                 do {
2730                         $res = $db->select( array( 'page', 'revision' ),
2731                                 array( 'rev_id', 'rev_user_text' ),
2732                                 array(
2733                                         'page_namespace' => $this->mTitle->getNamespace(),
2734                                         'page_title' => $this->mTitle->getDBkey(),
2735                                         'rev_page = page_id'
2736                                 ), __METHOD__, $this->getSelectOptions( array(
2737                                         'ORDER BY' => 'rev_timestamp DESC',
2738                                         'LIMIT' => $num
2739                                 ) )
2740                         );
2741                         if ( !$res ) {
2742                                 wfProfileOut( __METHOD__ );
2743                                 return array();
2744                         }
2745                         $row = $db->fetchObject( $res );
2746                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2747                                 $db = wfGetDB( DB_MASTER );
2748                                 $continue--;
2749                         } else {
2750                                 $continue = 0;
2751                         }
2752                 } while ( $continue );
2753
2754                 $authors = array( $row->rev_user_text );
2755                 while ( $row = $db->fetchObject( $res ) ) {
2756                         $authors[] = $row->rev_user_text;
2757                 }
2758                 wfProfileOut( __METHOD__ );
2759                 return $authors;
2760         }
2761
2762         /**
2763          * Output deletion confirmation dialog
2764          * @param $reason String: prefilled reason
2765          */
2766         public function confirmDelete( $reason ) {
2767                 global $wgOut, $wgUser;
2768
2769                 wfDebug( "Article::confirmDelete\n" );
2770
2771                 $deleteBackLink = $wgUser->getSkin()->link(
2772                         $this->mTitle,
2773                         null,
2774                         array(),
2775                         array(),
2776                         array( 'known', 'noclasses' )
2777                 );
2778                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
2779                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2780                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2781
2782                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
2783
2784                 if ( $wgUser->isAllowed( 'suppressrevision' ) ) {
2785                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2786                                         <td></td>
2787                                         <td class='mw-input'><strong>" .
2788                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2789                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2790                                         "</strong></td>
2791                                 </tr>";
2792                 } else {
2793                         $suppress = '';
2794                 }
2795                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2796
2797                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2798                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2799                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2800                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2801                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2802                         "<tr id=\"wpDeleteReasonListRow\">
2803                                 <td class='mw-label'>" .
2804                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2805                                 "</td>
2806                                 <td class='mw-input'>" .
2807                                         Xml::listDropDown( 'wpDeleteReasonList',
2808                                                 wfMsgForContent( 'deletereason-dropdown' ),
2809                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2810                                 "</td>
2811                         </tr>
2812                         <tr id=\"wpDeleteReasonRow\">
2813                                 <td class='mw-label'>" .
2814                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2815                                 "</td>
2816                                 <td class='mw-input'>" .
2817                                 Html::input( 'wpReason', $reason, 'text', array(
2818                                         'size' => '60',
2819                                         'maxlength' => '255',
2820                                         'tabindex' => '2',
2821                                         'id' => 'wpReason',
2822                                         'autofocus'
2823                                 ) ) .
2824                                 "</td>
2825                         </tr>";
2826                 # Dissalow watching is user is not logged in
2827                 if ( $wgUser->isLoggedIn() ) {
2828                         $form .= "
2829                         <tr>
2830                                 <td></td>
2831                                 <td class='mw-input'>" .
2832                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2833                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2834                                 "</td>
2835                         </tr>";
2836                 }
2837                 $form .= "
2838                         $suppress
2839                         <tr>
2840                                 <td></td>
2841                                 <td class='mw-submit'>" .
2842                                         Xml::submitButton( wfMsg( 'deletepage' ),
2843                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2844                                 "</td>
2845                         </tr>" .
2846                         Xml::closeElement( 'table' ) .
2847                         Xml::closeElement( 'fieldset' ) .
2848                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2849                         Xml::closeElement( 'form' );
2850
2851                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
2852                                 $skin = $wgUser->getSkin();
2853                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
2854                                 $link = $skin->link(
2855                                         $title,
2856                                         wfMsgHtml( 'delete-edit-reasonlist' ),
2857                                         array(),
2858                                         array( 'action' => 'edit' )
2859                                 );
2860                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2861                         }
2862
2863                 $wgOut->addHTML( $form );
2864                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2865                 LogEventsList::showLogExtract(
2866                         $wgOut,
2867                         'delete',
2868                         $this->mTitle->getPrefixedText()
2869                 );
2870         }
2871
2872         /**
2873          * Perform a deletion and output success or failure messages
2874          */
2875         public function doDelete( $reason, $suppress = false ) {
2876                 global $wgOut, $wgUser;
2877                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2878
2879                 $error = '';
2880                 if ( wfRunHooks( 'ArticleDelete', array( &$this, &$wgUser, &$reason, &$error ) ) ) {
2881                         if ( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2882                                 $deleted = $this->mTitle->getPrefixedText();
2883
2884                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2885                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2886
2887                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2888
2889                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2890                                 $wgOut->returnToMain( false );
2891                                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$wgUser, $reason, $id ) );
2892                         }
2893                 } else {
2894                         if ( $error == '' ) {
2895                                 $wgOut->showFatalError(
2896                                         Html::rawElement(
2897                                                 'div',
2898                                                 array( 'class' => 'error mw-error-cannotdelete' ),
2899                                                 wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2900                                         )
2901                                 );
2902                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2903                                 LogEventsList::showLogExtract(
2904                                         $wgOut,
2905                                         'delete',
2906                                         $this->mTitle->getPrefixedText()
2907                                 );
2908                         } else {
2909                                 $wgOut->showFatalError( $error );
2910                         }
2911                 }
2912         }
2913
2914         /**
2915          * Back-end article deletion
2916          * Deletes the article with database consistency, writes logs, purges caches
2917          *
2918          * @param $reason string delete reason for deletion log
2919          * @param suppress bitfield
2920          *      Revision::DELETED_TEXT
2921          *      Revision::DELETED_COMMENT
2922          *      Revision::DELETED_USER
2923          *      Revision::DELETED_RESTRICTED
2924          * @param $id int article ID
2925          * @param $commit boolean defaults to true, triggers transaction end
2926          * @return boolean true if successful
2927          */
2928         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true ) {
2929                 global $wgUseSquid, $wgDeferredUpdateList;
2930                 global $wgUseTrackbacks;
2931
2932                 wfDebug( __METHOD__ . "\n" );
2933
2934                 $dbw = wfGetDB( DB_MASTER );
2935                 $ns = $this->mTitle->getNamespace();
2936                 $t = $this->mTitle->getDBkey();
2937                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2938
2939                 if ( $t == '' || $id == 0 ) {
2940                         return false;
2941                 }
2942
2943                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable( $this->getRawText() ), -1 );
2944                 array_push( $wgDeferredUpdateList, $u );
2945
2946                 // Bitfields to further suppress the content
2947                 if ( $suppress ) {
2948                         $bitfield = 0;
2949                         // This should be 15...
2950                         $bitfield |= Revision::DELETED_TEXT;
2951                         $bitfield |= Revision::DELETED_COMMENT;
2952                         $bitfield |= Revision::DELETED_USER;
2953                         $bitfield |= Revision::DELETED_RESTRICTED;
2954                 } else {
2955                         $bitfield = 'rev_deleted';
2956                 }
2957
2958                 $dbw->begin();
2959                 // For now, shunt the revision data into the archive table.
2960                 // Text is *not* removed from the text table; bulk storage
2961                 // is left intact to avoid breaking block-compression or
2962                 // immutable storage schemes.
2963                 //
2964                 // For backwards compatibility, note that some older archive
2965                 // table entries will have ar_text and ar_flags fields still.
2966                 //
2967                 // In the future, we may keep revisions and mark them with
2968                 // the rev_deleted field, which is reserved for this purpose.
2969                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2970                         array(
2971                                 'ar_namespace'  => 'page_namespace',
2972                                 'ar_title'      => 'page_title',
2973                                 'ar_comment'    => 'rev_comment',
2974                                 'ar_user'       => 'rev_user',
2975                                 'ar_user_text'  => 'rev_user_text',
2976                                 'ar_timestamp'  => 'rev_timestamp',
2977                                 'ar_minor_edit' => 'rev_minor_edit',
2978                                 'ar_rev_id'     => 'rev_id',
2979                                 'ar_text_id'    => 'rev_text_id',
2980                                 'ar_text'       => '\'\'', // Be explicit to appease
2981                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2982                                 'ar_len'        => 'rev_len',
2983                                 'ar_page_id'    => 'page_id',
2984                                 'ar_deleted'    => $bitfield
2985                         ), array(
2986                                 'page_id' => $id,
2987                                 'page_id = rev_page'
2988                         ), __METHOD__
2989                 );
2990
2991                 # Delete restrictions for it
2992                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2993
2994                 # Now that it's safely backed up, delete it
2995                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2996                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2997                 if ( !$ok ) {
2998                         $dbw->rollback();
2999                         return false;
3000                 }
3001
3002                 # Fix category table counts
3003                 $cats = array();
3004                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
3005                 foreach ( $res as $row ) {
3006                         $cats [] = $row->cl_to;
3007                 }
3008                 $this->updateCategoryCounts( array(), $cats );
3009
3010                 # If using cascading deletes, we can skip some explicit deletes
3011                 if ( !$dbw->cascadingDeletes() ) {
3012                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
3013
3014                         if ( $wgUseTrackbacks )
3015                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
3016
3017                         # Delete outgoing links
3018                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
3019                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
3020                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
3021                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
3022                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
3023                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
3024                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
3025                 }
3026
3027                 # If using cleanup triggers, we can skip some manual deletes
3028                 if ( !$dbw->cleanupTriggers() ) {
3029                         # Clean up recentchanges entries...
3030                         $dbw->delete( 'recentchanges',
3031                                 array( 'rc_type != ' . RC_LOG,
3032                                         'rc_namespace' => $this->mTitle->getNamespace(),
3033                                         'rc_title' => $this->mTitle->getDBkey() ),
3034                                 __METHOD__ );
3035                         $dbw->delete( 'recentchanges',
3036                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
3037                                 __METHOD__ );
3038                 }
3039
3040                 # Clear caches
3041                 Article::onArticleDelete( $this->mTitle );
3042
3043                 # Clear the cached article id so the interface doesn't act like we exist
3044                 $this->mTitle->resetArticleID( 0 );
3045
3046                 # Log the deletion, if the page was suppressed, log it at Oversight instead
3047                 $logtype = $suppress ? 'suppress' : 'delete';
3048                 $log = new LogPage( $logtype );
3049
3050                 # Make sure logging got through
3051                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
3052
3053                 if ( $commit ) {
3054                         $dbw->commit();
3055                 }
3056
3057                 return true;
3058         }
3059
3060         /**
3061          * Roll back the most recent consecutive set of edits to a page
3062          * from the same user; fails if there are no eligible edits to
3063          * roll back to, e.g. user is the sole contributor. This function
3064          * performs permissions checks on $wgUser, then calls commitRollback()
3065          * to do the dirty work
3066          *
3067          * @param $fromP String: Name of the user whose edits to rollback.
3068          * @param $summary String: Custom summary. Set to default summary if empty.
3069          * @param $token String: Rollback token.
3070          * @param $bot Boolean: If true, mark all reverted edits as bot.
3071          *
3072          * @param $resultDetails Array: contains result-specific array of additional values
3073          *    'alreadyrolled' : 'current' (rev)
3074          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3075          *
3076          * @return array of errors, each error formatted as
3077          *   array(messagekey, param1, param2, ...).
3078          * On success, the array is empty.  This array can also be passed to
3079          * OutputPage::showPermissionsErrorPage().
3080          */
3081         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
3082                 global $wgUser;
3083                 $resultDetails = null;
3084
3085                 # Check permissions
3086                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
3087                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
3088                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3089
3090                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
3091                         $errors[] = array( 'sessionfailure' );
3092
3093                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
3094                         $errors[] = array( 'actionthrottledtext' );
3095                 }
3096                 # If there were errors, bail out now
3097                 if ( !empty( $errors ) )
3098                         return $errors;
3099
3100                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
3101         }
3102
3103         /**
3104          * Backend implementation of doRollback(), please refer there for parameter
3105          * and return value documentation
3106          *
3107          * NOTE: This function does NOT check ANY permissions, it just commits the
3108          * rollback to the DB Therefore, you should only call this function direct-
3109          * ly if you want to use custom permissions checks. If you don't, use
3110          * doRollback() instead.
3111          */
3112         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
3113                 global $wgUseRCPatrol, $wgUser, $wgLang;
3114                 $dbw = wfGetDB( DB_MASTER );
3115
3116                 if ( wfReadOnly() ) {
3117                         return array( array( 'readonlytext' ) );
3118                 }
3119
3120                 # Get the last editor
3121                 $current = Revision::newFromTitle( $this->mTitle );
3122                 if ( is_null( $current ) ) {
3123                         # Something wrong... no page?
3124                         return array( array( 'notanarticle' ) );
3125                 }
3126
3127                 $from = str_replace( '_', ' ', $fromP );
3128                 # User name given should match up with the top revision.
3129                 # If the user was deleted then $from should be empty.
3130                 if ( $from != $current->getUserText() ) {
3131                         $resultDetails = array( 'current' => $current );
3132                         return array( array( 'alreadyrolled',
3133                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3134                                 htmlspecialchars( $fromP ),
3135                                 htmlspecialchars( $current->getUserText() )
3136                         ) );
3137                 }
3138
3139                 # Get the last edit not by this guy...
3140                 # Note: these may not be public values
3141                 $user = intval( $current->getRawUser() );
3142                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3143                 $s = $dbw->selectRow( 'revision',
3144                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3145                         array( 'rev_page' => $current->getPage(),
3146                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3147                         ), __METHOD__,
3148                         array( 'USE INDEX' => 'page_timestamp',
3149                                 'ORDER BY'  => 'rev_timestamp DESC' )
3150                         );
3151                 if ( $s === false ) {
3152                         # No one else ever edited this page
3153                         return array( array( 'cantrollback' ) );
3154                 } else if ( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
3155                         # Only admins can see this text
3156                         return array( array( 'notvisiblerev' ) );
3157                 }
3158
3159                 $set = array();
3160                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
3161                         # Mark all reverted edits as bot
3162                         $set['rc_bot'] = 1;
3163                 }
3164                 if ( $wgUseRCPatrol ) {
3165                         # Mark all reverted edits as patrolled
3166                         $set['rc_patrolled'] = 1;
3167                 }
3168
3169                 if ( count( $set ) ) {
3170                         $dbw->update( 'recentchanges', $set,
3171                                 array( /* WHERE */
3172                                         'rc_cur_id' => $current->getPage(),
3173                                         'rc_user_text' => $current->getUserText(),
3174                                         "rc_timestamp > '{$s->rev_timestamp}'",
3175                                 ), __METHOD__
3176                         );
3177                 }
3178
3179                 # Generate the edit summary if necessary
3180                 $target = Revision::newFromId( $s->rev_id );
3181                 if ( empty( $summary ) ) {
3182                         if ( $from == '' ) { // no public user name
3183                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3184                         } else {
3185                                 $summary = wfMsgForContent( 'revertpage' );
3186                         }
3187                 }
3188
3189                 # Allow the custom summary to use the same args as the default message
3190                 $args = array(
3191                         $target->getUserText(), $from, $s->rev_id,
3192                         $wgLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ), true ),
3193                         $current->getId(), $wgLang->timeanddate( $current->getTimestamp() )
3194                 );
3195                 $summary = wfMsgReplaceArgs( $summary, $args );
3196
3197                 # Save
3198                 $flags = EDIT_UPDATE;
3199
3200                 if ( $wgUser->isAllowed( 'minoredit' ) )
3201                         $flags |= EDIT_MINOR;
3202
3203                 if ( $bot && ( $wgUser->isAllowed( 'markbotedits' ) || $wgUser->isAllowed( 'bot' ) ) )
3204                         $flags |= EDIT_FORCE_BOT;
3205                 # Actually store the edit
3206                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3207                 if ( !empty( $status->value['revision'] ) ) {
3208                         $revId = $status->value['revision']->getId();
3209                 } else {
3210                         $revId = false;
3211                 }
3212
3213                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3214
3215                 $resultDetails = array(
3216                         'summary' => $summary,
3217                         'current' => $current,
3218                         'target'  => $target,
3219                         'newid'   => $revId
3220                 );
3221                 return array();
3222         }
3223
3224         /**
3225          * User interface for rollback operations
3226          */
3227         public function rollback() {
3228                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
3229                 $details = null;
3230
3231                 $result = $this->doRollback(
3232                         $wgRequest->getVal( 'from' ),
3233                         $wgRequest->getText( 'summary' ),
3234                         $wgRequest->getVal( 'token' ),
3235                         $wgRequest->getBool( 'bot' ),
3236                         $details
3237                 );
3238
3239                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
3240                         $wgOut->rateLimited();
3241                         return;
3242                 }
3243                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3244                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3245                         $errArray = $result[0];
3246                         $errMsg = array_shift( $errArray );
3247                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3248                         if ( isset( $details['current'] ) ) {
3249                                 $current = $details['current'];
3250                                 if ( $current->getComment() != '' ) {
3251                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3252                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3253                                 }
3254                         }
3255                         return;
3256                 }
3257                 # Display permissions errors before read-only message -- there's no
3258                 # point in misleading the user into thinking the inability to rollback
3259                 # is only temporary.
3260                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3261                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
3262                         # move any 'readonlytext' error manually.
3263                         $out = array();
3264                         foreach ( $result as $error ) {
3265                                 if ( $error != array( 'readonlytext' ) ) {
3266                                         $out [] = $error;
3267                                 }
3268                         }
3269                         $wgOut->showPermissionsErrorPage( $out );
3270                         return;
3271                 }
3272                 if ( $result == array( array( 'readonlytext' ) ) ) {
3273                         $wgOut->readOnlyPage();
3274                         return;
3275                 }
3276
3277                 $current = $details['current'];
3278                 $target = $details['target'];
3279                 $newId = $details['newid'];
3280                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3281                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3282                 if ( $current->getUserText() === '' ) {
3283                         $old = wfMsg( 'rev-deleted-user' );
3284                 } else {
3285                         $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
3286                                 . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
3287                 }
3288                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
3289                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
3290                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3291                 $wgOut->returnToMain( false, $this->mTitle );
3292
3293                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3294                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3295                         $de->showDiff( '', '' );
3296                 }
3297         }
3298
3299
3300         /**
3301          * Do standard deferred updates after page view
3302          */
3303         public function viewUpdates() {
3304                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3305                 if ( wfReadOnly() ) {
3306                         return;
3307                 }
3308                 # Don't update page view counters on views from bot users (bug 14044)
3309                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
3310                         Article::incViewCount( $this->getID() );
3311                         $u = new SiteStatsUpdate( 1, 0, 0 );
3312                         array_push( $wgDeferredUpdateList, $u );
3313                 }
3314                 # Update newtalk / watchlist notification status
3315                 $wgUser->clearNotification( $this->mTitle );
3316         }
3317
3318         /**
3319          * Prepare text which is about to be saved.
3320          * Returns a stdclass with source, pst and output members
3321          */
3322         public function prepareTextForEdit( $text, $revid = null ) {
3323                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3324                         // Already prepared
3325                         return $this->mPreparedEdit;
3326                 }
3327                 global $wgParser;
3328                 $edit = (object)array();
3329                 $edit->revid = $revid;
3330                 $edit->newText = $text;
3331                 $edit->pst = $this->preSaveTransform( $text );
3332                 $options = $this->getParserOptions();
3333                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
3334                 $edit->oldText = $this->getContent();
3335                 $this->mPreparedEdit = $edit;
3336                 return $edit;
3337         }
3338
3339         /**
3340          * Do standard deferred updates after page edit.
3341          * Update links tables, site stats, search index and message cache.
3342          * Purges pages that include this page if the text was changed here.
3343          * Every 100th edit, prune the recent changes table.
3344          *
3345          * @private
3346          * @param $text New text of the article
3347          * @param $summary Edit summary
3348          * @param $minoredit Minor edit
3349          * @param $timestamp_of_pagechange Timestamp associated with the page change
3350          * @param $newid rev_id value of the new revision
3351          * @param $changed Whether or not the content actually changed
3352          */
3353         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
3354                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgEnableParserCache;
3355
3356                 wfProfileIn( __METHOD__ );
3357
3358                 # Parse the text
3359                 # Be careful not to double-PST: $text is usually already PST-ed once
3360                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3361                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3362                         $editInfo = $this->prepareTextForEdit( $text, $newid );
3363                 } else {
3364                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3365                         $editInfo = $this->mPreparedEdit;
3366                 }
3367
3368                 # Save it to the parser cache
3369                 if ( $wgEnableParserCache ) {
3370                         $popts = $this->getParserOptions();
3371                         $parserCache = ParserCache::singleton();
3372                         $parserCache->save( $editInfo->output, $this, $popts );
3373                 }
3374
3375                 # Update the links tables
3376                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3377                 $u->doUpdate();
3378
3379                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3380
3381                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3382                         if ( 0 == mt_rand( 0, 99 ) ) {
3383                                 // Flush old entries from the `recentchanges` table; we do this on
3384                                 // random requests so as to avoid an increase in writes for no good reason
3385                                 global $wgRCMaxAge;
3386                                 $dbw = wfGetDB( DB_MASTER );
3387                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3388                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3389                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3390                                 $dbw->query( $sql );
3391                         }
3392                 }
3393
3394                 $id = $this->getID();
3395                 $title = $this->mTitle->getPrefixedDBkey();
3396                 $shortTitle = $this->mTitle->getDBkey();
3397
3398                 if ( 0 == $id ) {
3399                         wfProfileOut( __METHOD__ );
3400                         return;
3401                 }
3402
3403                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3404                 array_push( $wgDeferredUpdateList, $u );
3405                 $u = new SearchUpdate( $id, $title, $text );
3406                 array_push( $wgDeferredUpdateList, $u );
3407
3408                 # If this is another user's talk page, update newtalk
3409                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3410                 # load of user talk pages and piss people off, nor if it's a minor edit
3411                 # by a properly-flagged bot.
3412                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3413                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
3414                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3415                                 $other = User::newFromName( $shortTitle, false );
3416                                 if ( !$other ) {
3417                                         wfDebug( __METHOD__ . ": invalid username\n" );
3418                                 } elseif ( User::isIP( $shortTitle ) ) {
3419                                         // An anonymous user
3420                                         $other->setNewtalk( true );
3421                                 } elseif ( $other->isLoggedIn() ) {
3422                                         $other->setNewtalk( true );
3423                                 } else {
3424                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3425                                 }
3426                         }
3427                 }
3428
3429                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3430                         $wgMessageCache->replace( $shortTitle, $text );
3431                 }
3432
3433                 wfProfileOut( __METHOD__ );
3434         }
3435
3436         /**
3437          * Perform article updates on a special page creation.
3438          *
3439          * @param $rev Revision object
3440          *
3441          * @todo This is a shitty interface function. Kill it and replace the
3442          * other shitty functions like editUpdates and such so it's not needed
3443          * anymore.
3444          */
3445         public function createUpdates( $rev ) {
3446                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3447                 $this->mTotalAdjustment = 1;
3448                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3449                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3450         }
3451
3452         /**
3453          * Generate the navigation links when browsing through an article revisions
3454          * It shows the information as:
3455          *   Revision as of \<date\>; view current revision
3456          *   \<- Previous version | Next Version -\>
3457          *
3458          * @param $oldid String: revision ID of this article revision
3459          */
3460         public function setOldSubtitle( $oldid = 0 ) {
3461                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3462
3463                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3464                         return;
3465                 }
3466
3467                 $unhide = $wgRequest->getInt( 'unhide' ) == 1 &&
3468                         $wgUser->matchEditToken( $wgRequest->getVal( 'token' ), $oldid );
3469                 # Cascade unhide param in links for easy deletion browsing
3470                 $extraParams = array();
3471                 if ( $wgRequest->getVal( 'unhide' ) ) {
3472                         $extraParams['unhide'] = 1;
3473                 }
3474                 $revision = Revision::newFromId( $oldid );
3475
3476                 $current = ( $oldid == $this->mLatest );
3477                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3478                 $tddate = $wgLang->date( $this->mTimestamp, true );
3479                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3480                 $sk = $wgUser->getSkin();
3481                 $lnk = $current
3482                         ? wfMsgHtml( 'currentrevisionlink' )
3483                         : $sk->link(
3484                                 $this->mTitle,
3485                                 wfMsgHtml( 'currentrevisionlink' ),
3486                                 array(),
3487                                 $extraParams,
3488                                 array( 'known', 'noclasses' )
3489                         );
3490                 $curdiff = $current
3491                         ? wfMsgHtml( 'diff' )
3492                         : $sk->link(
3493                                 $this->mTitle,
3494                                 wfMsgHtml( 'diff' ),
3495                                 array(),
3496                                 array(
3497                                         'diff' => 'cur',
3498                                         'oldid' => $oldid
3499                                 ) + $extraParams,
3500                                 array( 'known', 'noclasses' )
3501                         );
3502                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3503                 $prevlink = $prev
3504                         ? $sk->link(
3505                                 $this->mTitle,
3506                                 wfMsgHtml( 'previousrevision' ),
3507                                 array(),
3508                                 array(
3509                                         'direction' => 'prev',
3510                                         'oldid' => $oldid
3511                                 ) + $extraParams,
3512                                 array( 'known', 'noclasses' )
3513                         )
3514                         : wfMsgHtml( 'previousrevision' );
3515                 $prevdiff = $prev
3516                         ? $sk->link(
3517                                 $this->mTitle,
3518                                 wfMsgHtml( 'diff' ),
3519                                 array(),
3520                                 array(
3521                                         'diff' => 'prev',
3522                                         'oldid' => $oldid
3523                                 ) + $extraParams,
3524                                 array( 'known', 'noclasses' )
3525                         )
3526                         : wfMsgHtml( 'diff' );
3527                 $nextlink = $current
3528                         ? wfMsgHtml( 'nextrevision' )
3529                         : $sk->link(
3530                                 $this->mTitle,
3531                                 wfMsgHtml( 'nextrevision' ),
3532                                 array(),
3533                                 array(
3534                                         'direction' => 'next',
3535                                         'oldid' => $oldid
3536                                 ) + $extraParams,
3537                                 array( 'known', 'noclasses' )
3538                         );
3539                 $nextdiff = $current
3540                         ? wfMsgHtml( 'diff' )
3541                         : $sk->link(
3542                                 $this->mTitle,
3543                                 wfMsgHtml( 'diff' ),
3544                                 array(),
3545                                 array(
3546                                         'diff' => 'next',
3547                                         'oldid' => $oldid
3548                                 ) + $extraParams,
3549                                 array( 'known', 'noclasses' )
3550                         );
3551
3552                 $cdel = '';
3553                 // User can delete revisions or view deleted revisions...
3554                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3555                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3556                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3557                                 $cdel = $sk->revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3558                         } else {
3559                                 $query = array(
3560                                         'type'   => 'revision',
3561                                         'target' => $this->mTitle->getPrefixedDbkey(),
3562                                         'ids'    => $oldid
3563                                 );
3564                                 $cdel = $sk->revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3565                         }
3566                         $cdel .= ' ';
3567                 }
3568
3569                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3570                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3571
3572                 $m = wfMsg( 'revision-info-current' );
3573                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3574                         ? 'revision-info-current'
3575                         : 'revision-info';
3576
3577                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3578                         wfMsgExt(
3579                                 $infomsg,
3580                                 array( 'parseinline', 'replaceafter' ),
3581                                 $td,
3582                                 $userlinks,
3583                                 $revision->getID(),
3584                                 $tddate,
3585                                 $tdtime,
3586                                 $revision->getUser()
3587                         ) .
3588                         "</div>\n" .
3589                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3590                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3591                 $wgOut->setSubtitle( $r );
3592         }
3593
3594         /**
3595          * This function is called right before saving the wikitext,
3596          * so we can do things like signatures and links-in-context.
3597          *
3598          * @param $text String article contents
3599          * @return string article contents with altered wikitext markup (signatures
3600          *      converted, {{subst:}}, templates, etc.)
3601          */
3602         public function preSaveTransform( $text ) {
3603                 global $wgParser, $wgUser;
3604                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3605         }
3606
3607         /* Caching functions */
3608
3609         /**
3610          * checkLastModified returns true if it has taken care of all
3611          * output to the client that is necessary for this request.
3612          * (that is, it has sent a cached version of the page)
3613          *
3614          * @return boolean true if cached version send, false otherwise
3615          */
3616         protected function tryFileCache() {
3617                 static $called = false;
3618                 if ( $called ) {
3619                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3620                         return false;
3621                 }
3622                 $called = true;
3623                 if ( $this->isFileCacheable() ) {
3624                         $cache = new HTMLFileCache( $this->mTitle );
3625                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3626                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3627                                 $cache->loadFromFileCache();
3628                                 return true;
3629                         } else {
3630                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3631                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3632                         }
3633                 } else {
3634                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3635                 }
3636                 return false;
3637         }
3638
3639         /**
3640          * Check if the page can be cached
3641          * @return bool
3642          */
3643         public function isFileCacheable() {
3644                 $cacheable = false;
3645                 if ( HTMLFileCache::useFileCache() ) {
3646                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3647                         // Extension may have reason to disable file caching on some pages.
3648                         if ( $cacheable ) {
3649                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3650                         }
3651                 }
3652                 return $cacheable;
3653         }
3654
3655         /**
3656          * Loads page_touched and returns a value indicating if it should be used
3657          * @return boolean true if not a redirect
3658          */
3659         public function checkTouched() {
3660                 if ( !$this->mDataLoaded ) {
3661                         $this->loadPageData();
3662                 }
3663                 return !$this->mIsRedirect;
3664         }
3665
3666         /**
3667          * Get the page_touched field
3668          * @return string containing GMT timestamp
3669          */
3670         public function getTouched() {
3671                 # Ensure that page data has been loaded
3672                 if ( !$this->mDataLoaded ) {
3673                         $this->loadPageData();
3674                 }
3675                 return $this->mTouched;
3676         }
3677
3678         /**
3679          * Get the page_latest field
3680          * @return integer rev_id of current revision
3681          */
3682         public function getLatest() {
3683                 if ( !$this->mDataLoaded ) {
3684                         $this->loadPageData();
3685                 }
3686                 return (int)$this->mLatest;
3687         }
3688
3689         /**
3690          * Edit an article without doing all that other stuff
3691          * The article must already exist; link tables etc
3692          * are not updated, caches are not flushed.
3693          *
3694          * @param $text String: text submitted
3695          * @param $comment String: comment submitted
3696          * @param $minor Boolean: whereas it's a minor modification
3697          */
3698         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3699                 wfProfileIn( __METHOD__ );
3700
3701                 $dbw = wfGetDB( DB_MASTER );
3702                 $revision = new Revision( array(
3703                         'page'       => $this->getId(),
3704                         'text'       => $text,
3705                         'comment'    => $comment,
3706                         'minor_edit' => $minor ? 1 : 0,
3707                         ) );
3708                 $revision->insertOn( $dbw );
3709                 $this->updateRevisionOn( $dbw, $revision );
3710
3711                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
3712
3713                 wfProfileOut( __METHOD__ );
3714         }
3715
3716         /**
3717          * Used to increment the view counter
3718          *
3719          * @param $id Integer: article id
3720          */
3721         public static function incViewCount( $id ) {
3722                 $id = intval( $id );
3723                 global $wgHitcounterUpdateFreq;
3724
3725                 $dbw = wfGetDB( DB_MASTER );
3726                 $pageTable = $dbw->tableName( 'page' );
3727                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3728                 $acchitsTable = $dbw->tableName( 'acchits' );
3729
3730                 if ( $wgHitcounterUpdateFreq <= 1 ) {
3731                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3732                         return;
3733                 }
3734
3735                 # Not important enough to warrant an error page in case of failure
3736                 $oldignore = $dbw->ignoreErrors( true );
3737
3738                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3739
3740                 $checkfreq = intval( $wgHitcounterUpdateFreq / 25 + 1 );
3741                 if ( ( rand() % $checkfreq != 0 ) or ( $dbw->lastErrno() != 0 ) ) {
3742                         # Most of the time (or on SQL errors), skip row count check
3743                         $dbw->ignoreErrors( $oldignore );
3744                         return;
3745                 }
3746
3747                 $res = $dbw->query( "SELECT COUNT(*) as n FROM $hitcounterTable" );
3748                 $row = $dbw->fetchObject( $res );
3749                 $rown = intval( $row->n );
3750                 if ( $rown >= $wgHitcounterUpdateFreq ) {
3751                         wfProfileIn( 'Article::incViewCount-collect' );
3752                         $old_user_abort = ignore_user_abort( true );
3753
3754                         $dbType = $dbw->getType();
3755                         $dbw->lockTables( array(), array( 'hitcounter' ), __METHOD__, false );
3756                         $tabletype = $dbType == 'mysql' ? "ENGINE=HEAP " : '';
3757                         $dbw->query( "CREATE TEMPORARY TABLE $acchitsTable $tabletype AS " .
3758                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable " .
3759                                 'GROUP BY hc_id', __METHOD__ );
3760                         $dbw->delete( 'hitcounter', '*', __METHOD__ );
3761                         $dbw->unlockTables( __METHOD__ );
3762                         if ( $dbType == 'mysql' ) {
3763                                 $dbw->query( "UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n " .
3764                                         'WHERE page_id = hc_id', __METHOD__ );
3765                         }
3766                         else {
3767                                 $dbw->query( "UPDATE $pageTable SET page_counter=page_counter + hc_n " .
3768                                         "FROM $acchitsTable WHERE page_id = hc_id", __METHOD__ );
3769                         }
3770                         $dbw->query( "DROP TABLE $acchitsTable", __METHOD__ );
3771
3772                         ignore_user_abort( $old_user_abort );
3773                         wfProfileOut( 'Article::incViewCount-collect' );
3774                 }
3775                 $dbw->ignoreErrors( $oldignore );
3776         }
3777
3778         /**#@+
3779          * The onArticle*() functions are supposed to be a kind of hooks
3780          * which should be called whenever any of the specified actions
3781          * are done.
3782          *
3783          * This is a good place to put code to clear caches, for instance.
3784          *
3785          * This is called on page move and undelete, as well as edit
3786          *
3787          * @param $title a title object
3788          */
3789         public static function onArticleCreate( $title ) {
3790                 # Update existence markers on article/talk tabs...
3791                 if ( $title->isTalkPage() ) {
3792                         $other = $title->getSubjectPage();
3793                 } else {
3794                         $other = $title->getTalkPage();
3795                 }
3796                 $other->invalidateCache();
3797                 $other->purgeSquid();
3798
3799                 $title->touchLinks();
3800                 $title->purgeSquid();
3801                 $title->deleteTitleProtection();
3802         }
3803
3804         /**
3805          * Clears caches when article is deleted
3806          */
3807         public static function onArticleDelete( $title ) {
3808                 global $wgMessageCache;
3809                 # Update existence markers on article/talk tabs...
3810                 if ( $title->isTalkPage() ) {
3811                         $other = $title->getSubjectPage();
3812                 } else {
3813                         $other = $title->getTalkPage();
3814                 }
3815                 $other->invalidateCache();
3816                 $other->purgeSquid();
3817
3818                 $title->touchLinks();
3819                 $title->purgeSquid();
3820
3821                 # File cache
3822                 HTMLFileCache::clearFileCache( $title );
3823
3824                 # Messages
3825                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3826                         $wgMessageCache->replace( $title->getDBkey(), false );
3827                 }
3828                 # Images
3829                 if ( $title->getNamespace() == NS_FILE ) {
3830                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3831                         $update->doUpdate();
3832                 }
3833                 # User talk pages
3834                 if ( $title->getNamespace() == NS_USER_TALK ) {
3835                         $user = User::newFromName( $title->getText(), false );
3836                         $user->setNewtalk( false );
3837                 }
3838                 # Image redirects
3839                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3840         }
3841
3842         /**
3843          * Purge caches on page update etc
3844          */
3845         public static function onArticleEdit( $title, $flags = '' ) {
3846                 global $wgDeferredUpdateList;
3847
3848                 // Invalidate caches of articles which include this page
3849                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3850
3851                 // Invalidate the caches of all pages which redirect here
3852                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3853
3854                 # Purge squid for this page only
3855                 $title->purgeSquid();
3856
3857                 # Clear file cache for this page only
3858                 HTMLFileCache::clearFileCache( $title );
3859         }
3860
3861         /**#@-*/
3862
3863         /**
3864          * Overriden by ImagePage class, only present here to avoid a fatal error
3865          * Called for ?action=revert
3866          */
3867         public function revert() {
3868                 global $wgOut;
3869                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3870         }
3871
3872         /**
3873          * Info about this page
3874          * Called for ?action=info when $wgAllowPageInfo is on.
3875          */
3876         public function info() {
3877                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3878
3879                 if ( !$wgAllowPageInfo ) {
3880                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3881                         return;
3882                 }
3883
3884                 $page = $this->mTitle->getSubjectPage();
3885
3886                 $wgOut->setPagetitle( $page->getPrefixedText() );
3887                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3888                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3889
3890                 if ( !$this->mTitle->exists() ) {
3891                         $wgOut->addHTML( '<div class="noarticletext">' );
3892                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3893                                 // This doesn't quite make sense; the user is asking for
3894                                 // information about the _page_, not the message... -- RC
3895                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3896                         } else {
3897                                 $msg = $wgUser->isLoggedIn()
3898                                         ? 'noarticletext'
3899                                         : 'noarticletextanon';
3900                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3901                         }
3902                         $wgOut->addHTML( '</div>' );
3903                 } else {
3904                         $dbr = wfGetDB( DB_SLAVE );
3905                         $wl_clause = array(
3906                                 'wl_title'     => $page->getDBkey(),
3907                                 'wl_namespace' => $page->getNamespace() );
3908                         $numwatchers = $dbr->selectField(
3909                                 'watchlist',
3910                                 'COUNT(*)',
3911                                 $wl_clause,
3912                                 __METHOD__,
3913                                 $this->getSelectOptions() );
3914
3915                         $pageInfo = $this->pageCountInfo( $page );
3916                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3917
3918                         $wgOut->addHTML( "<ul><li>" . wfMsg( "numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3919                         $wgOut->addHTML( "<li>" . wfMsg( 'numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>' );
3920                         if ( $talkInfo ) {
3921                                 $wgOut->addHTML( '<li>' . wfMsg( "numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>' );
3922                         }
3923                         $wgOut->addHTML( '<li>' . wfMsg( "numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3924                         if ( $talkInfo ) {
3925                                 $wgOut->addHTML( '<li>' . wfMsg( 'numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3926                         }
3927                         $wgOut->addHTML( '</ul>' );
3928                 }
3929         }
3930
3931         /**
3932          * Return the total number of edits and number of unique editors
3933          * on a given page. If page does not exist, returns false.
3934          *
3935          * @param $title Title object
3936          * @return mixed array or boolean false
3937          */
3938         public function pageCountInfo( $title ) {
3939                 $id = $title->getArticleId();
3940                 if ( $id == 0 ) {
3941                         return false;
3942                 }
3943                 $dbr = wfGetDB( DB_SLAVE );
3944                 $rev_clause = array( 'rev_page' => $id );
3945                 $edits = $dbr->selectField(
3946                         'revision',
3947                         'COUNT(rev_page)',
3948                         $rev_clause,
3949                         __METHOD__,
3950                         $this->getSelectOptions()
3951                 );
3952                 $authors = $dbr->selectField(
3953                         'revision',
3954                         'COUNT(DISTINCT rev_user_text)',
3955                         $rev_clause,
3956                         __METHOD__,
3957                         $this->getSelectOptions()
3958                 );
3959                 return array( 'edits' => $edits, 'authors' => $authors );
3960         }
3961
3962         /**
3963          * Return a list of templates used by this article.
3964          * Uses the templatelinks table
3965          *
3966          * @return Array of Title objects
3967          */
3968         public function getUsedTemplates() {
3969                 $result = array();
3970                 $id = $this->mTitle->getArticleID();
3971                 if ( $id == 0 ) {
3972                         return array();
3973                 }
3974                 $dbr = wfGetDB( DB_SLAVE );
3975                 $res = $dbr->select( array( 'templatelinks' ),
3976                         array( 'tl_namespace', 'tl_title' ),
3977                         array( 'tl_from' => $id ),
3978                         __METHOD__ );
3979                 if ( $res !== false ) {
3980                         foreach ( $res as $row ) {
3981                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3982                         }
3983                 }
3984                 $dbr->freeResult( $res );
3985                 return $result;
3986         }
3987
3988         /**
3989          * Returns a list of hidden categories this page is a member of.
3990          * Uses the page_props and categorylinks tables.
3991          *
3992          * @return Array of Title objects
3993          */
3994         public function getHiddenCategories() {
3995                 $result = array();
3996                 $id = $this->mTitle->getArticleID();
3997                 if ( $id == 0 ) {
3998                         return array();
3999                 }
4000                 $dbr = wfGetDB( DB_SLAVE );
4001                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
4002                         array( 'cl_to' ),
4003                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
4004                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
4005                         __METHOD__ );
4006                 if ( $res !== false ) {
4007                         foreach ( $res as $row ) {
4008                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
4009                         }
4010                 }
4011                 $dbr->freeResult( $res );
4012                 return $result;
4013         }
4014
4015         /**
4016         * Return an applicable autosummary if one exists for the given edit.
4017         * @param $oldtext String: the previous text of the page.
4018         * @param $newtext String: The submitted text of the page.
4019         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
4020         * @return string An appropriate autosummary, or an empty string.
4021         */
4022         public static function getAutosummary( $oldtext, $newtext, $flags ) {
4023                 # Decide what kind of autosummary is needed.
4024
4025                 # Redirect autosummaries
4026                 $ot = Title::newFromRedirect( $oldtext );
4027                 $rt = Title::newFromRedirect( $newtext );
4028                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
4029                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
4030                 }
4031
4032                 # New page autosummaries
4033                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
4034                         # If they're making a new article, give its text, truncated, in the summary.
4035                         global $wgContLang;
4036                         $truncatedtext = $wgContLang->truncate(
4037                                 str_replace( "\n", ' ', $newtext ),
4038                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
4039                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
4040                 }
4041
4042                 # Blanking autosummaries
4043                 if ( $oldtext != '' && $newtext == '' ) {
4044                         return wfMsgForContent( 'autosumm-blank' );
4045                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
4046                         # Removing more than 90% of the article
4047                         global $wgContLang;
4048                         $truncatedtext = $wgContLang->truncate(
4049                                 $newtext,
4050                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
4051                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
4052                 }
4053
4054                 # If we reach this point, there's no applicable autosummary for our case, so our
4055                 # autosummary is empty.
4056                 return '';
4057         }
4058
4059         /**
4060          * Add the primary page-view wikitext to the output buffer
4061          * Saves the text into the parser cache if possible.
4062          * Updates templatelinks if it is out of date.
4063          *
4064          * @param $text String
4065          * @param $cache Boolean
4066          * @param $parserOptions mixed ParserOptions object, or boolean false
4067          */
4068         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
4069                 global $wgOut;
4070
4071                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
4072                 $wgOut->addParserOutput( $this->mParserOutput );
4073         }
4074
4075         /**
4076          * This does all the heavy lifting for outputWikitext, except it returns the parser
4077          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
4078          * say, embedding thread pages within a discussion system (LiquidThreads)
4079          *
4080          * @param $text string
4081          * @param $cache boolean
4082          * @param $parserOptions parsing options, defaults to false
4083          * @return string containing parsed output
4084          */
4085         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
4086                 global $wgParser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
4087
4088                 if ( !$parserOptions ) {
4089                         $parserOptions = $this->getParserOptions();
4090                 }
4091
4092                 $time = - wfTime();
4093                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
4094                         $parserOptions, true, true, $this->getRevIdFetched() );
4095                 $time += wfTime();
4096
4097                 # Timing hack
4098                 if ( $time > 3 ) {
4099                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
4100                                 $this->mTitle->getPrefixedDBkey() ) );
4101                 }
4102
4103                 if ( $wgEnableParserCache && $cache && $this && $this->mParserOutput->getCacheTime() != -1 ) {
4104                         $parserCache = ParserCache::singleton();
4105                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
4106                 }
4107                 // Make sure file cache is not used on uncacheable content.
4108                 // Output that has magic words in it can still use the parser cache
4109                 // (if enabled), though it will generally expire sooner.
4110                 if ( $this->mParserOutput->getCacheTime() == -1 || $this->mParserOutput->containsOldMagic() ) {
4111                         $wgUseFileCache = false;
4112                 }
4113                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4114                 return $this->mParserOutput;
4115         }
4116
4117         /**
4118          * Get parser options suitable for rendering the primary article wikitext
4119          * @return mixed ParserOptions object or boolean false
4120          */
4121         public function getParserOptions() {
4122                 global $wgUser;
4123                 if ( !$this->mParserOptions ) {
4124                         $this->mParserOptions = new ParserOptions( $wgUser );
4125                         $this->mParserOptions->setTidy( true );
4126                         $this->mParserOptions->enableLimitReport();
4127                 }
4128                 return $this->mParserOptions;
4129         }
4130
4131         /**
4132          * Updates cascading protections
4133          *
4134          * @param $parserOutput mixedParseerOptions object, or boolean false
4135          **/
4136
4137         protected function doCascadeProtectionUpdates( $parserOutput ) {
4138                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4139                         return;
4140                 }
4141
4142                 // templatelinks table may have become out of sync,
4143                 // especially if using variable-based transclusions.
4144                 // For paranoia, check if things have changed and if
4145                 // so apply updates to the database. This will ensure
4146                 // that cascaded protections apply as soon as the changes
4147                 // are visible.
4148
4149                 # Get templates from templatelinks
4150                 $id = $this->mTitle->getArticleID();
4151
4152                 $tlTemplates = array();
4153
4154                 $dbr = wfGetDB( DB_SLAVE );
4155                 $res = $dbr->select( array( 'templatelinks' ),
4156                         array( 'tl_namespace', 'tl_title' ),
4157                         array( 'tl_from' => $id ),
4158                         __METHOD__ );
4159
4160                 global $wgContLang;
4161                 foreach ( $res as $row ) {
4162                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4163                 }
4164
4165                 # Get templates from parser output.
4166                 $poTemplates = array();
4167                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4168                         foreach ( $templates as $dbk => $id ) {
4169                                 $poTemplates["$ns:$dbk"] = true;
4170                         }
4171                 }
4172
4173                 # Get the diff
4174                 # Note that we simulate array_diff_key in PHP <5.0.x
4175                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4176
4177                 if ( count( $templates_diff ) > 0 ) {
4178                         # Whee, link updates time.
4179                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4180                         $u->doUpdate();
4181                 }
4182         }
4183
4184         /**
4185          * Update all the appropriate counts in the category table, given that
4186          * we've added the categories $added and deleted the categories $deleted.
4187          *
4188          * @param $added array   The names of categories that were added
4189          * @param $deleted array The names of categories that were deleted
4190          */
4191         public function updateCategoryCounts( $added, $deleted ) {
4192                 $ns = $this->mTitle->getNamespace();
4193                 $dbw = wfGetDB( DB_MASTER );
4194
4195                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4196                 # exist, we might legitimately not create it, but it's simpler to just
4197                 # create it and then give it a negative value, since the value is bogus
4198                 # anyway.
4199                 #
4200                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4201                 $insertCats = array_merge( $added, $deleted );
4202                 if ( !$insertCats ) {
4203                         # Okay, nothing to do
4204                         return;
4205                 }
4206                 $insertRows = array();
4207                 foreach ( $insertCats as $cat ) {
4208                         $insertRows[] = array(
4209                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
4210                                 'cat_title' => $cat
4211                         );
4212                 }
4213                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4214
4215                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4216                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4217                 if ( $ns == NS_CATEGORY ) {
4218                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4219                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4220                 } elseif ( $ns == NS_FILE ) {
4221                         $addFields[]    = 'cat_files = cat_files + 1';
4222                         $removeFields[] = 'cat_files = cat_files - 1';
4223                 }
4224
4225                 if ( $added ) {
4226                         $dbw->update(
4227                                 'category',
4228                                 $addFields,
4229                                 array( 'cat_title' => $added ),
4230                                 __METHOD__
4231                         );
4232                 }
4233                 if ( $deleted ) {
4234                         $dbw->update(
4235                                 'category',
4236                                 $removeFields,
4237                                 array( 'cat_title' => $deleted ),
4238                                 __METHOD__
4239                         );
4240                 }
4241         }
4242
4243         /**
4244          * Lightweight method to get the parser output for a page, checking the parser cache
4245          * and so on. Doesn't consider most of the stuff that Article::view is forced to
4246          * consider, so it's not appropriate to use there.
4247          *
4248          * @param $oldid mixed integer Revision ID or null
4249          */
4250         public function getParserOutput( $oldid = null ) {
4251                 global $wgEnableParserCache, $wgUser, $wgOut;
4252
4253                 // Should the parser cache be used?
4254                 $useParserCache = $wgEnableParserCache &&
4255                           intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
4256                           $this->exists() &&
4257                           $oldid === null;
4258
4259                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4260                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
4261                         wfIncrStats( 'pcache_miss_stub' );
4262                 }
4263
4264                 $parserOutput = false;
4265                 if ( $useParserCache ) {
4266                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4267                 }
4268
4269                 if ( $parserOutput === false ) {
4270                         // Cache miss; parse and output it.
4271                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4272
4273                         return $this->getOutputFromWikitext( $rev->getText(), $useParserCache );
4274                 } else {
4275                         return $parserOutput;
4276                 }
4277         }
4278 }