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  * @internal documentation reviewed 15 Mar 2010
  15  */
  16 class Article {
  17         /**@{{
  18          * @private
  19          */
  20         var $mComment = '';               // !<
  21         var $mContent;                    // !<
  22         var $mContentLoaded = false;      // !<
  23         var $mCounter = -1;               // !< Not loaded
  24         var $mCurID = -1;                 // !< Not loaded
  25         var $mDataLoaded = false;         // !<
  26         var $mForUpdate = false;          // !<
  27         var $mGoodAdjustment = 0;         // !<
  28         var $mIsRedirect = false;         // !<
  29         var $mLatest = false;             // !<
  30         var $mMinorEdit;                  // !<
  31         var $mOldId;                      // !<
  32         var $mPreparedEdit = false;       // !< Title object if set
  33         var $mRedirectedFrom = null;      // !< Title object if set
  34         var $mRedirectTarget = null;      // !< Title object if set
  35         var $mRedirectUrl = false;        // !<
  36         var $mRevIdFetched = 0;           // !<
  37         var $mRevision;                   // !< Revision object if set
  38         var $mTimestamp = '';             // !<
  39         var $mTitle;                      // !< Title object
  40         var $mTotalAdjustment = 0;        // !<
  41         var $mTouched = '19700101000000'; // !<
  42         var $mUser = -1;                  // !< Not loaded
  43         var $mUserText = '';              // !< username from Revision if set
  44         var $mParserOptions;              // !< ParserOptions object
  45         var $mParserOutput;               // !< ParserCache object if set
  46         /**@}}*/
  47
  48         /**
  49          * Constructor and clear the article
  50          * @param $title Reference to a Title object.
  51          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  52          */
  53         public function __construct( Title $title, $oldId = null ) {
  54                 $this->mTitle =& $title;
  55                 $this->mOldId = $oldId;
  56         }
  57
  58         /**
  59          * Constructor from an article article
  60          * @param $id The article ID to load
  61          */
  62         public static function newFromID( $id ) {
  63                 $t = Title::newFromID( $id );
  64                 # FIXME: doesn't inherit right
  65                 return $t == null ? null : new self( $t );
  66                 # return $t == null ? null : new static( $t ); // PHP 5.3
  67         }
  68
  69         /**
  70          * Tell the page view functions that this view was redirected
  71          * from another page on the wiki.
  72          * @param $from Title object.
  73          */
  74         public function setRedirectedFrom( Title $from ) {
  75                 $this->mRedirectedFrom = $from;
  76         }
  77
  78         /**
  79          * If this page is a redirect, get its target
  80          *
  81          * The target will be fetched from the redirect table if possible.
  82          * If this page doesn't have an entry there, call insertRedirect()
  83          * @return mixed Title object, or null if this page is not a redirect
  84          */
  85         public function getRedirectTarget() {
  86                 if ( !$this->mTitle || !$this->mTitle->isRedirect() )
  87                         return null;
  88                 if ( !is_null( $this->mRedirectTarget ) )
  89                         return $this->mRedirectTarget;
  90                 # Query the redirect table
  91                 $dbr = wfGetDB( DB_SLAVE );
  92                 $row = $dbr->selectRow( 'redirect',
  93                         array( 'rd_namespace', 'rd_title' ),
  94                         array( 'rd_from' => $this->getID() ),
  95                         __METHOD__
  96                 );
  97                 if ( $row ) {
  98                         return $this->mRedirectTarget = Title::makeTitle( $row->rd_namespace, $row->rd_title );
  99                 }
 100                 # This page doesn't have an entry in the redirect table
 101                 return $this->mRedirectTarget = $this->insertRedirect();
 102         }
 103
 104         /**
 105          * Insert an entry for this page into the redirect table.
 106          *
 107          * Don't call this function directly unless you know what you're doing.
 108          * @return Title object
 109          */
 110         public function insertRedirect() {
 111                 $retval = Title::newFromRedirect( $this->getContent() );
 112                 if ( !$retval ) {
 113                         return null;
 114                 }
 115                 $dbw = wfGetDB( DB_MASTER );
 116                 $dbw->replace( 'redirect', array( 'rd_from' ),
 117                         array(
 118                                 'rd_from' => $this->getID(),
 119                                 'rd_namespace' => $retval->getNamespace(),
 120                                 'rd_title' => $retval->getDBkey()
 121                         ),
 122                         __METHOD__
 123                 );
 124                 return $retval;
 125         }
 126
 127         /**
 128          * Get the Title object this page redirects to
 129          *
 130          * @return mixed false, Title of in-wiki target, or string with URL
 131          */
 132         public function followRedirect() {
 133                 $text = $this->getContent();
 134                 return $this->followRedirectText( $text );
 135         }
 136
 137         /**
 138          * Get the Title object this text redirects to
 139          *
 140          * @param $text string article content containing redirect info
 141          * @return mixed false, Title of in-wiki target, or string with URL
 142          */
 143         public function followRedirectText( $text ) {
 144                 $rt = Title::newFromRedirectRecurse( $text ); // recurse through to only get the final target
 145                 # process if title object is valid and not special:userlogout
 146                 if ( $rt ) {
 147                         if ( $rt->getInterwiki() != '' ) {
 148                                 if ( $rt->isLocal() ) {
 149                                         // Offsite wikis need an HTTP redirect.
 150                                         //
 151                                         // This can be hard to reverse and may produce loops,
 152                                         // so they may be disabled in the site configuration.
 153                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 154                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 155                                 }
 156                         } else {
 157                                 if ( $rt->getNamespace() == NS_SPECIAL ) {
 158                                         // Gotta handle redirects to special pages differently:
 159                                         // Fill the HTTP response "Location" header and ignore
 160                                         // the rest of the page we're on.
 161                                         //
 162                                         // This can be hard to reverse, so they may be disabled.
 163                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 164                                                 // rolleyes
 165                                         } else {
 166                                                 return $rt->getFullURL();
 167                                         }
 168                                 }
 169                                 return $rt;
 170                         }
 171                 }
 172                 // No or invalid redirect
 173                 return false;
 174         }
 175
 176         /**
 177          * get the title object of the article
 178          * @return Title object of current title
 179          */
 180         public function getTitle() {
 181                 return $this->mTitle;
 182         }
 183
 184         /**
 185          * Clear the object
 186          * @private
 187          */
 188         public function clear() {
 189                 $this->mDataLoaded    = false;
 190                 $this->mContentLoaded = false;
 191
 192                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 193                 $this->mRedirectedFrom = null; # Title object if set
 194                 $this->mRedirectTarget = null; # Title object if set
 195                 $this->mUserText =
 196                 $this->mTimestamp = $this->mComment = '';
 197                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 198                 $this->mTouched = '19700101000000';
 199                 $this->mForUpdate = false;
 200                 $this->mIsRedirect = false;
 201                 $this->mRevIdFetched = 0;
 202                 $this->mRedirectUrl = false;
 203                 $this->mLatest = false;
 204                 $this->mPreparedEdit = false;
 205         }
 206
 207         /**
 208          * Note that getContent/loadContent do not follow redirects anymore.
 209          * If you need to fetch redirectable content easily, try
 210          * the shortcut in Article::followContent()
 211          *
 212          * @return Return the text of this revision
 213          */
 214         public function getContent() {
 215                 global $wgUser, $wgContLang, $wgOut, $wgMessageCache;
 216                 wfProfileIn( __METHOD__ );
 217                 if ( $this->getID() === 0 ) {
 218                         # If this is a MediaWiki:x message, then load the messages
 219                         # and return the message value for x.
 220                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 221                                 # If this is a system message, get the default text.
 222                                 list( $message, $lang ) = $wgMessageCache->figureMessage( $wgContLang->lcfirst( $this->mTitle->getText() ) );
 223                                 $wgMessageCache->loadAllMessages( $lang );
 224                                 $text = wfMsgGetKey( $message, false, $lang, false );
 225                                 if ( wfEmptyMsg( $message, $text ) )
 226                                         $text = '';
 227                         } else {
 228                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 229                         }
 230                         wfProfileOut( __METHOD__ );
 231                         return $text;
 232                 } else {
 233                         $this->loadContent();
 234                         wfProfileOut( __METHOD__ );
 235                         return $this->mContent;
 236                 }
 237         }
 238
 239         /**
 240          * Get the text of the current revision. No side-effects...
 241          *
 242          * @return Return the text of the current revision
 243          */
 244         public function getRawText() {
 245                 // Check process cache for current revision
 246                 if ( $this->mContentLoaded && $this->mOldId == 0 ) {
 247                         return $this->mContent;
 248                 }
 249                 $rev = Revision::newFromTitle( $this->mTitle );
 250                 $text = $rev ? $rev->getRawText() : false;
 251                 return $text;
 252         }
 253
 254         /**
 255          * This function returns the text of a section, specified by a number ($section).
 256          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 257          * the first section before any such heading (section 0).
 258          *
 259          * If a section contains subsections, these are also returned.
 260          *
 261          * @param $text String: text to look in
 262          * @param $section Integer: section number
 263          * @return string text of the requested section
 264          * @deprecated
 265          */
 266         public function getSection( $text, $section ) {
 267                 global $wgParser;
 268                 return $wgParser->getSection( $text, $section );
 269         }
 270
 271         /**
 272          * Get the text that needs to be saved in order to undo all revisions
 273          * between $undo and $undoafter. Revisions must belong to the same page,
 274          * must exist and must not be deleted
 275          * @param $undo Revision
 276          * @param $undoafter Revision Must be an earlier revision than $undo
 277          * @return mixed string on success, false on failure
 278          */
 279         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 280                 $undo_text = $undo->getText();
 281                 $undoafter_text = $undoafter->getText();
 282                 $cur_text = $this->getContent();
 283                 if ( $cur_text == $undo_text ) {
 284                         # No use doing a merge if it's just a straight revert.
 285                         return $undoafter_text;
 286                 }
 287                 $undone_text = '';
 288                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) )
 289                         return false;
 290                 return $undone_text;
 291         }
 292
 293         /**
 294          * @return int The oldid of the article that is to be shown, 0 for the
 295          *             current revision
 296          */
 297         public function getOldID() {
 298                 if ( is_null( $this->mOldId ) ) {
 299                         $this->mOldId = $this->getOldIDFromRequest();
 300                 }
 301                 return $this->mOldId;
 302         }
 303
 304         /**
 305          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 306          *
 307          * @return int The old id for the request
 308          */
 309         public function getOldIDFromRequest() {
 310                 global $wgRequest;
 311                 $this->mRedirectUrl = false;
 312                 $oldid = $wgRequest->getVal( 'oldid' );
 313                 if ( isset( $oldid ) ) {
 314                         $oldid = intval( $oldid );
 315                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 316                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 317                                 if ( $nextid  ) {
 318                                         $oldid = $nextid;
 319                                 } else {
 320                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 321                                 }
 322                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 323                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 324                                 if ( $previd ) {
 325                                         $oldid = $previd;
 326                                 }
 327                         }
 328                 }
 329                 if ( !$oldid ) {
 330                         $oldid = 0;
 331                 }
 332                 return $oldid;
 333         }
 334
 335         /**
 336          * Load the revision (including text) into this object
 337          */
 338         function loadContent() {
 339                 if ( $this->mContentLoaded ) return;
 340                 wfProfileIn( __METHOD__ );
 341                 # Query variables :P
 342                 $oldid = $this->getOldID();
 343                 # Pre-fill content with error message so that if something
 344                 # fails we'll have something telling us what we intended.
 345                 $this->mOldId = $oldid;
 346                 $this->fetchContent( $oldid );
 347                 wfProfileOut( __METHOD__ );
 348         }
 349
 350
 351         /**
 352          * Fetch a page record with the given conditions
 353          * @param $dbr Database object
 354          * @param $conditions Array
 355          * @return mixed Database result resource, or false on failure
 356          */
 357         protected function pageData( $dbr, $conditions ) {
 358                 $fields = array(
 359                                 'page_id',
 360                                 'page_namespace',
 361                                 'page_title',
 362                                 'page_restrictions',
 363                                 'page_counter',
 364                                 'page_is_redirect',
 365                                 'page_is_new',
 366                                 'page_random',
 367                                 'page_touched',
 368                                 'page_latest',
 369                                 'page_len',
 370                 );
 371                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 372                 $row = $dbr->selectRow(
 373                         'page',
 374                         $fields,
 375                         $conditions,
 376                         __METHOD__
 377                 );
 378                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 379                 return $row ;
 380         }
 381
 382         /**
 383          * Fetch a page record matching the Title object's namespace and title
 384          * using a sanitized title string
 385          *
 386          * @param $dbr Database object
 387          * @param $title Title object
 388          * @return mixed Database result resource, or false on failure
 389          */
 390         public function pageDataFromTitle( $dbr, $title ) {
 391                 return $this->pageData( $dbr, array(
 392                         'page_namespace' => $title->getNamespace(),
 393                         'page_title'     => $title->getDBkey() ) );
 394         }
 395
 396         /**
 397          * Fetch a page record matching the requested ID
 398          *
 399          * @param $dbr Database
 400          * @param $id Integer
 401          */
 402         protected function pageDataFromId( $dbr, $id ) {
 403                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 404         }
 405
 406         /**
 407          * Set the general counter, title etc data loaded from
 408          * some source.
 409          *
 410          * @param $data Database row object or "fromdb"
 411          */
 412         public function loadPageData( $data = 'fromdb' ) {
 413                 if ( $data === 'fromdb' ) {
 414                         $dbr = wfGetDB( DB_MASTER );
 415                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 416                 }
 417
 418                 $lc = LinkCache::singleton();
 419                 if ( $data ) {
 420                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 421
 422                         $this->mTitle->mArticleID = intval( $data->page_id );
 423
 424                         # Old-fashioned restrictions
 425                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 426
 427                         $this->mCounter     = intval( $data->page_counter );
 428                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 429                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 430                         $this->mLatest      = intval( $data->page_latest );
 431                 } else {
 432                         if ( is_object( $this->mTitle ) ) {
 433                                 $lc->addBadLinkObj( $this->mTitle );
 434                         }
 435                         $this->mTitle->mArticleID = 0;
 436                 }
 437
 438                 $this->mDataLoaded  = true;
 439         }
 440
 441         /**
 442          * Get text of an article from database
 443          * Does *NOT* follow redirects.
 444          *
 445          * @param $oldid Int: 0 for whatever the latest revision is
 446          * @return mixed string containing article contents, or false if null
 447          */
 448         function fetchContent( $oldid = 0 ) {
 449                 if ( $this->mContentLoaded ) {
 450                         return $this->mContent;
 451                 }
 452
 453                 $dbr = wfGetDB( DB_MASTER );
 454
 455                 # Pre-fill content with error message so that if something
 456                 # fails we'll have something telling us what we intended.
 457                 $t = $this->mTitle->getPrefixedText();
 458                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 459                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 460
 461                 if ( $oldid ) {
 462                         $revision = Revision::newFromId( $oldid );
 463                         if ( is_null( $revision ) ) {
 464                                 wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 465                                 return false;
 466                         }
 467                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 468                         if ( !$data ) {
 469                                 wfDebug( __METHOD__ . " failed to get page data linked to revision id $oldid\n" );
 470                                 return false;
 471                         }
 472                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 473                         $this->loadPageData( $data );
 474                 } else {
 475                         if ( !$this->mDataLoaded ) {
 476                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 477                                 if ( !$data ) {
 478                                         wfDebug( __METHOD__ . " failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 479                                         return false;
 480                                 }
 481                                 $this->loadPageData( $data );
 482                         }
 483                         $revision = Revision::newFromId( $this->mLatest );
 484                         if ( is_null( $revision ) ) {
 485                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id {$this->mLatest}\n" );
 486                                 return false;
 487                         }
 488                 }
 489
 490                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 491                 // We should instead work with the Revision object when we need it...
 492                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 493
 494                 $this->mUser      = $revision->getUser();
 495                 $this->mUserText  = $revision->getUserText();
 496                 $this->mComment   = $revision->getComment();
 497                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 498
 499                 $this->mRevIdFetched = $revision->getId();
 500                 $this->mContentLoaded = true;
 501                 $this->mRevision =& $revision;
 502
 503                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 504
 505                 return $this->mContent;
 506         }
 507
 508         /**
 509          * Read/write accessor to select FOR UPDATE
 510          *
 511          * @param $x Mixed: FIXME
 512          * @return mixed value of $x, or value stored in Article::mForUpdate
 513          */
 514         public function forUpdate( $x = null ) {
 515                 return wfSetVar( $this->mForUpdate, $x );
 516         }
 517
 518         /**
 519          * Get the database which should be used for reads
 520          *
 521          * @return Database
 522          * @deprecated - just call wfGetDB( DB_MASTER ) instead
 523          */
 524         function getDB() {
 525                 wfDeprecated( __METHOD__ );
 526                 return wfGetDB( DB_MASTER );
 527         }
 528
 529         /**
 530          * Get options for all SELECT statements
 531          *
 532          * @param $options Array: an optional options array which'll be appended to
 533          *                       the default
 534          * @return Array: options
 535          */
 536         protected function getSelectOptions( $options = '' ) {
 537                 if ( $this->mForUpdate ) {
 538                         if ( is_array( $options ) ) {
 539                                 $options[] = 'FOR UPDATE';
 540                         } else {
 541                                 $options = 'FOR UPDATE';
 542                         }
 543                 }
 544                 return $options;
 545         }
 546
 547         /**
 548          * @return int Page ID
 549          */
 550         public function getID() {
 551                 if ( $this->mTitle ) {
 552                         return $this->mTitle->getArticleID();
 553                 } else {
 554                         return 0;
 555                 }
 556         }
 557
 558         /**
 559          * @return bool Whether or not the page exists in the database
 560          */
 561         public function exists() {
 562                 return $this->getId() > 0;
 563         }
 564
 565         /**
 566          * Check if this page is something we're going to be showing
 567          * some sort of sensible content for. If we return false, page
 568          * views (plain action=view) will return an HTTP 404 response,
 569          * so spiders and robots can know they're following a bad link.
 570          *
 571          * @return bool
 572          */
 573         public function hasViewableContent() {
 574                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 575         }
 576
 577         /**
 578          * @return int The view count for the page
 579          */
 580         public function getCount() {
 581                 if ( -1 == $this->mCounter ) {
 582                         $id = $this->getID();
 583                         if ( $id == 0 ) {
 584                                 $this->mCounter = 0;
 585                         } else {
 586                                 $dbr = wfGetDB( DB_SLAVE );
 587                                 $this->mCounter = $dbr->selectField( 'page',
 588                                         'page_counter',
 589                                         array( 'page_id' => $id ),
 590                                         __METHOD__,
 591                                         $this->getSelectOptions()
 592                                 );
 593                         }
 594                 }
 595                 return $this->mCounter;
 596         }
 597
 598         /**
 599          * Determine whether a page  would be suitable for being counted as an
 600          * article in the site_stats table based on the title & its content
 601          *
 602          * @param $text String: text to analyze
 603          * @return bool
 604          */
 605         public function isCountable( $text ) {
 606                 global $wgUseCommaCount;
 607
 608                 $token = $wgUseCommaCount ? ',' : '[[';
 609                 return $this->mTitle->isContentPage() && !$this->isRedirect( $text ) && in_string( $token, $text );
 610         }
 611
 612         /**
 613          * Tests if the article text represents a redirect
 614          *
 615          * @param $text mixed string containing article contents, or boolean
 616          * @return bool
 617          */
 618         public function isRedirect( $text = false ) {
 619                 if ( $text === false ) {
 620                         if ( $this->mDataLoaded ) {
 621                                 return $this->mIsRedirect;
 622                         }
 623                         // Apparently loadPageData was never called
 624                         $this->loadContent();
 625                         $titleObj = Title::newFromRedirectRecurse( $this->fetchContent() );
 626                 } else {
 627                         $titleObj = Title::newFromRedirect( $text );
 628                 }
 629                 return $titleObj !== null;
 630         }
 631
 632         /**
 633          * Returns true if the currently-referenced revision is the current edit
 634          * to this page (and it exists).
 635          * @return bool
 636          */
 637         public function isCurrent() {
 638                 # If no oldid, this is the current version.
 639                 if ( $this->getOldID() == 0 ) {
 640                         return true;
 641                 }
 642                 return $this->exists() && isset( $this->mRevision ) && $this->mRevision->isCurrent();
 643         }
 644
 645         /**
 646          * Loads everything except the text
 647          * This isn't necessary for all uses, so it's only done if needed.
 648          */
 649         protected function loadLastEdit() {
 650                 if ( -1 != $this->mUser )
 651                         return;
 652
 653                 # New or non-existent articles have no user information
 654                 $id = $this->getID();
 655                 if ( 0 == $id ) return;
 656
 657                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 658                 if ( !is_null( $this->mLastRevision ) ) {
 659                         $this->mUser      = $this->mLastRevision->getUser();
 660                         $this->mUserText  = $this->mLastRevision->getUserText();
 661                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 662                         $this->mComment   = $this->mLastRevision->getComment();
 663                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 664                         $this->mRevIdFetched = $this->mLastRevision->getId();
 665                 }
 666         }
 667
 668         /**
 669          * @return string GMT timestamp of last article revision
 670          **/
 671
 672         public function getTimestamp() {
 673                 // Check if the field has been filled by ParserCache::get()
 674                 if ( !$this->mTimestamp ) {
 675                         $this->loadLastEdit();
 676                 }
 677                 return wfTimestamp( TS_MW, $this->mTimestamp );
 678         }
 679
 680         /**
 681          * @return int user ID for the user that made the last article revision
 682          */
 683         public function getUser() {
 684                 $this->loadLastEdit();
 685                 return $this->mUser;
 686         }
 687
 688         /**
 689          * @return string username of the user that made the last article revision
 690          */
 691         public function getUserText() {
 692                 $this->loadLastEdit();
 693                 return $this->mUserText;
 694         }
 695
 696         /**
 697          * @return string Comment stored for the last article revision
 698          */
 699         public function getComment() {
 700                 $this->loadLastEdit();
 701                 return $this->mComment;
 702         }
 703
 704         /**
 705          * Returns true if last revision was marked as "minor edit"
 706          *
 707          * @return boolean Minor edit indicator for the last article revision.
 708          */
 709         public function getMinorEdit() {
 710                 $this->loadLastEdit();
 711                 return $this->mMinorEdit;
 712         }
 713
 714         /**
 715          * Use this to fetch the rev ID used on page views
 716          *
 717          * @return int revision ID of last article revision
 718          */
 719         public function getRevIdFetched() {
 720                 $this->loadLastEdit();
 721                 return $this->mRevIdFetched;
 722         }
 723
 724         /**
 725          * @param $limit Integer: default 0.
 726          * @param $offset Integer: default 0.
 727          * @return UserArrayFromResult object with User objects of article contributors for requested range
 728          */
 729         public function getContributors( $limit = 0, $offset = 0 ) {
 730                 # XXX: this is expensive; cache this info somewhere.
 731
 732                 $dbr = wfGetDB( DB_SLAVE );
 733                 $revTable = $dbr->tableName( 'revision' );
 734                 $userTable = $dbr->tableName( 'user' );
 735
 736                 $pageId = $this->getId();
 737
 738                 $user = $this->getUser();
 739                 if ( $user ) {
 740                         $excludeCond = "AND rev_user != $user";
 741                 } else {
 742                         $userText = $dbr->addQuotes( $this->getUserText() );
 743                         $excludeCond = "AND rev_user_text != $userText";
 744                 }
 745
 746                 $deletedBit = $dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER ); // username hidden?
 747
 748                 $sql = "SELECT {$userTable}.*, rev_user_text as user_name, MAX(rev_timestamp) as timestamp
 749                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 750                         WHERE rev_page = $pageId
 751                         $excludeCond
 752                         AND $deletedBit = 0
 753                         GROUP BY rev_user, rev_user_text
 754                         ORDER BY timestamp DESC";
 755
 756                 if ( $limit > 0 )
 757                         $sql = $dbr->limitResult( $sql, $limit, $offset );
 758
 759                 $sql .= ' ' . $this->getSelectOptions();
 760                 $res = $dbr->query( $sql, __METHOD__ );
 761
 762                 return new UserArrayFromResult( $res );
 763         }
 764
 765         /**
 766          * This is the default action of the index.php entry point: just view the
 767          * page of the given title.
 768          */
 769         public function view() {
 770                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 771                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 772                 global $wgUseTrackbacks, $wgUseFileCache;
 773
 774                 wfProfileIn( __METHOD__ );
 775
 776                 # Get variables from query string
 777                 $oldid = $this->getOldID();
 778                 $parserCache = ParserCache::singleton();
 779
 780                 $parserOptions = clone $this->getParserOptions();
 781                 # Render printable version, use printable version cache
 782                 if ( $wgOut->isPrintable() ) {
 783                         $parserOptions->setIsPrintable( true );
 784                 }
 785
 786                 # Try client and file cache
 787                 if ( $oldid === 0 && $this->checkTouched() ) {
 788                         global $wgUseETag;
 789                         if ( $wgUseETag ) {
 790                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 791                         }
 792                         # Is is client cached?
 793                         if ( $wgOut->checkLastModified( $this->getTouched() ) ) {
 794                                 wfDebug( __METHOD__ . ": done 304\n" );
 795                                 wfProfileOut( __METHOD__ );
 796                                 return;
 797                         # Try file cache
 798                         } else if ( $wgUseFileCache && $this->tryFileCache() ) {
 799                                 wfDebug( __METHOD__ . ": done file cache\n" );
 800                                 # tell wgOut that output is taken care of
 801                                 $wgOut->disable();
 802                                 $this->viewUpdates();
 803                                 wfProfileOut( __METHOD__ );
 804                                 return;
 805                         }
 806                 }
 807
 808                 # getOldID may want us to redirect somewhere else
 809                 if ( $this->mRedirectUrl ) {
 810                         $wgOut->redirect( $this->mRedirectUrl );
 811                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 812                         wfProfileOut( __METHOD__ );
 813                         return;
 814                 }
 815
 816                 $wgOut->setArticleFlag( true );
 817                 # Set page title (may be overridden by DISPLAYTITLE)
 818                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 819
 820                 # If we got diff in the query, we want to see a diff page instead of the article.
 821                 if ( !is_null( $wgRequest->getVal( 'diff' ) ) ) {
 822                         wfDebug( __METHOD__ . ": showing diff page\n" );
 823                         $this->showDiffPage();
 824                         wfProfileOut( __METHOD__ );
 825                         return;
 826                 }
 827
 828                 # Should the parser cache be used?
 829                 $useParserCache = $this->useParserCache( $oldid );
 830                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 831                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 832                         wfIncrStats( 'pcache_miss_stub' );
 833                 }
 834
 835                 # For the main page, overwrite the <title> element with the con-
 836                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 837                 # that's not empty).
 838                 if ( $this->mTitle->equals( Title::newMainPage() )
 839                         && ( $m = wfMsgForContent( 'pagetitle-view-mainpage' ) ) !== '' )
 840                 {
 841                         $wgOut->setHTMLTitle( $m );
 842                 }
 843
 844                 $wasRedirected = $this->showRedirectedFromHeader();
 845                 $this->showNamespaceHeader();
 846
 847                 # Iterate through the possible ways of constructing the output text.
 848                 # Keep going until $outputDone is set, or we run out of things to do.
 849                 $pass = 0;
 850                 $outputDone = false;
 851                 while ( !$outputDone && ++$pass ) {
 852                         switch( $pass ) {
 853                                 case 1:
 854                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 855                                         break;
 856
 857                                 case 2:
 858                                         # Try the parser cache
 859                                         if ( $useParserCache ) {
 860                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 861                                                 if ( $this->mParserOutput !== false ) {
 862                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 863                                                         $wgOut->addParserOutput( $this->mParserOutput );
 864                                                         # Ensure that UI elements requiring revision ID have
 865                                                         # the correct version information.
 866                                                         $wgOut->setRevisionId( $this->mLatest );
 867                                                         $outputDone = true;
 868                                                 }
 869                                         }
 870                                         break;
 871
 872                                 case 3:
 873                                         $text = $this->getContent();
 874                                         if ( $text === false || $this->getID() == 0 ) {
 875                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 876                                                 $this->showMissingArticle();
 877                                                 wfProfileOut( __METHOD__ );
 878                                                 return;
 879                                         }
 880
 881                                         # Another whitelist check in case oldid is altering the title
 882                                         if ( !$this->mTitle->userCanRead() ) {
 883                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 884                                                 $wgOut->loginToUse();
 885                                                 $wgOut->output();
 886                                                 $wgOut->disable();
 887                                                 wfProfileOut( __METHOD__ );
 888                                                 return;
 889                                         }
 890
 891                                         # Are we looking at an old revision
 892                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 893                                                 $this->setOldSubtitle( $oldid );
 894                                                 if ( !$this->showDeletedRevisionHeader() ) {
 895                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 896                                                         wfProfileOut( __METHOD__ );
 897                                                         return;
 898                                                 }
 899                                                 # If this "old" version is the current, then try the parser cache...
 900                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
 901                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 902                                                         if ( $this->mParserOutput ) {
 903                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 904                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 905                                                                 $wgOut->setRevisionId( $this->mLatest );
 906                                                                 $this->showViewFooter();
 907                                                                 $this->viewUpdates();
 908                                                                 wfProfileOut( __METHOD__ );
 909                                                                 return;
 910                                                         }
 911                                                 }
 912                                         }
 913
 914                                         # Ensure that UI elements requiring revision ID have
 915                                         # the correct version information.
 916                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 917
 918                                         # Pages containing custom CSS or JavaScript get special treatment
 919                                         if ( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 920                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 921                                                 $this->showCssOrJsPage();
 922                                                 $outputDone = true;
 923                                         } else if ( $rt = Title::newFromRedirectArray( $text ) ) {
 924                                                 wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 925                                                 # Viewing a redirect page (e.g. with parameter redirect=no)
 926                                                 # Don't append the subtitle if this was an old revision
 927                                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 928                                                 # Parse just to get categories, displaytitle, etc.
 929                                                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
 930                                                 $wgOut->addParserOutputNoText( $this->mParserOutput );
 931                                                 $outputDone = true;
 932                                         }
 933                                         break;
 934
 935                                 case 4:
 936                                         # Run the parse, protected by a pool counter
 937                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 938                                         $key = $parserCache->getKey( $this, $parserOptions );
 939                                         $poolCounter = PoolCounter::factory( 'Article::view', $key );
 940                                         $dirtyCallback = $useParserCache ? array( $this, 'tryDirtyCache' ) : false;
 941                                         $status = $poolCounter->executeProtected( array( $this, 'doViewParse' ), $dirtyCallback );
 942
 943                                         if ( !$status->isOK() ) {
 944                                                 # Connection or timeout error
 945                                                 $this->showPoolError( $status );
 946                                                 wfProfileOut( __METHOD__ );
 947                                                 return;
 948                                         } else {
 949                                                 $outputDone = true;
 950                                         }
 951                                         break;
 952
 953                                 # Should be unreachable, but just in case...
 954                                 default:
 955                                         break 2;
 956                         }
 957                 }
 958
 959                 # Now that we've filled $this->mParserOutput, we know whether
 960                 # there are any __NOINDEX__ tags on the page
 961                 $policy = $this->getRobotPolicy( 'view' );
 962                 $wgOut->setIndexPolicy( $policy['index'] );
 963                 $wgOut->setFollowPolicy( $policy['follow'] );
 964
 965                 $this->showViewFooter();
 966                 $this->viewUpdates();
 967                 wfProfileOut( __METHOD__ );
 968         }
 969
 970         /**
 971          * Show a diff page according to current request variables. For use within
 972          * Article::view() only, other callers should use the DifferenceEngine class.
 973          */
 974         public function showDiffPage() {
 975                 global $wgOut, $wgRequest, $wgUser;
 976
 977                 $diff = $wgRequest->getVal( 'diff' );
 978                 $rcid = $wgRequest->getVal( 'rcid' );
 979                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 980                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 981                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
 982                 $oldid = $this->getOldID();
 983
 984                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $unhide );
 985                 // DifferenceEngine directly fetched the revision:
 986                 $this->mRevIdFetched = $de->mNewid;
 987                 $de->showDiffPage( $diffOnly );
 988
 989                 // Needed to get the page's current revision
 990                 $this->loadPageData();
 991                 if ( $diff == 0 || $diff == $this->mLatest ) {
 992                         # Run view updates for current revision only
 993                         $this->viewUpdates();
 994                 }
 995         }
 996
 997         /**
 998          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 999          * Article::view() only.
1000          *
1001          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
1002          * page views.
1003          */
1004         public function showCssOrJsPage() {
1005                 global $wgOut;
1006                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
1007                 // Give hooks a chance to customise the output
1008                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
1009                         // Wrap the whole lot in a <pre> and don't parse
1010                         $m = array();
1011                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
1012                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
1013                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
1014                         $wgOut->addHTML( "\n</pre>\n" );
1015                 }
1016         }
1017
1018         /**
1019          * Get the robot policy to be used for the current action=view request.
1020          * @return String the policy that should be set
1021          * @deprecated use getRobotPolicy() instead, which returns an associative
1022          *    array
1023          */
1024         public function getRobotPolicyForView() {
1025                 wfDeprecated( __METHOD__ );
1026                 $policy = $this->getRobotPolicy( 'view' );
1027                 return $policy['index'] . ',' . $policy['follow'];
1028         }
1029
1030         /**
1031          * Get the robot policy to be used for the current view
1032          * @param $action String the action= GET parameter
1033          * @return Array the policy that should be set
1034          * TODO: actions other than 'view'
1035          */
1036         public function getRobotPolicy( $action ) {
1037
1038                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1039                 global $wgDefaultRobotPolicy, $wgRequest;
1040
1041                 $ns = $this->mTitle->getNamespace();
1042                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
1043                         # Don't index user and user talk pages for blocked users (bug 11443)
1044                         if ( !$this->mTitle->isSubpage() ) {
1045                                 $block = new Block();
1046                                 if ( $block->load( $this->mTitle->getText() ) ) {
1047                                         return array( 'index'  => 'noindex',
1048                                                       'follow' => 'nofollow' );
1049                                 }
1050                         }
1051                 }
1052
1053                 if ( $this->getID() === 0 || $this->getOldID() ) {
1054                         # Non-articles (special pages etc), and old revisions
1055                         return array( 'index'  => 'noindex',
1056                                       'follow' => 'nofollow' );
1057                 } elseif ( $wgOut->isPrintable() ) {
1058                         # Discourage indexing of printable versions, but encourage following
1059                         return array( 'index'  => 'noindex',
1060                                       'follow' => 'follow' );
1061                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
1062                         # For ?curid=x urls, disallow indexing
1063                         return array( 'index'  => 'noindex',
1064                                       'follow' => 'follow' );
1065                 }
1066
1067                 # Otherwise, construct the policy based on the various config variables.
1068                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1069
1070                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1071                         # Honour customised robot policies for this namespace
1072                         $policy = array_merge( $policy,
1073                                                self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] ) );
1074                 }
1075                 if ( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
1076                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1077                         # a final sanity check that we have really got the parser output.
1078                         $policy = array_merge( $policy,
1079                                                array( 'index' => $this->mParserOutput->getIndexPolicy() ) );
1080                 }
1081
1082                 if ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
1083                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1084                         $policy = array_merge( $policy,
1085                                                self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) );
1086                 }
1087
1088                 return $policy;
1089
1090         }
1091
1092         /**
1093          * Converts a String robot policy into an associative array, to allow
1094          * merging of several policies using array_merge().
1095          * @param $policy Mixed, returns empty array on null/false/'', transparent
1096          *            to already-converted arrays, converts String.
1097          * @return associative Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1098          */
1099         public static function formatRobotPolicy( $policy ) {
1100                 if ( is_array( $policy ) ) {
1101                         return $policy;
1102                 } elseif ( !$policy ) {
1103                         return array();
1104                 }
1105
1106                 $policy = explode( ',', $policy );
1107                 $policy = array_map( 'trim', $policy );
1108
1109                 $arr = array();
1110                 foreach ( $policy as $var ) {
1111                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
1112                                 $arr['index'] = $var;
1113                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
1114                                 $arr['follow'] = $var;
1115                         }
1116                 }
1117                 return $arr;
1118         }
1119
1120         /**
1121          * If this request is a redirect view, send "redirected from" subtitle to
1122          * $wgOut. Returns true if the header was needed, false if this is not a
1123          * redirect view. Handles both local and remote redirects.
1124          *
1125          * @return boolean
1126          */
1127         public function showRedirectedFromHeader() {
1128                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1129
1130                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1131                 $sk = $wgUser->getSkin();
1132                 if ( isset( $this->mRedirectedFrom ) ) {
1133                         // This is an internally redirected page view.
1134                         // We'll need a backlink to the source page for navigation.
1135                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1136                                 $redir = $sk->link(
1137                                         $this->mRedirectedFrom,
1138                                         null,
1139                                         array(),
1140                                         array( 'redirect' => 'no' ),
1141                                         array( 'known', 'noclasses' )
1142                                 );
1143                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1144                                 $wgOut->setSubtitle( $s );
1145
1146                                 // Set the fragment if one was specified in the redirect
1147                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
1148                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1149                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1150                                 }
1151
1152                                 // Add a <link rel="canonical"> tag
1153                                 $wgOut->addLink( array( 'rel' => 'canonical',
1154                                         'href' => $this->mTitle->getLocalURL() )
1155                                 );
1156                                 return true;
1157                         }
1158                 } elseif ( $rdfrom ) {
1159                         // This is an externally redirected view, from some other wiki.
1160                         // If it was reported from a trusted site, supply a backlink.
1161                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1162                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
1163                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1164                                 $wgOut->setSubtitle( $s );
1165                                 return true;
1166                         }
1167                 }
1168                 return false;
1169         }
1170
1171         /**
1172          * Show a header specific to the namespace currently being viewed, like
1173          * [[MediaWiki:Talkpagetext]]. For Article::view().
1174          */
1175         public function showNamespaceHeader() {
1176                 global $wgOut;
1177                 if ( $this->mTitle->isTalkPage() ) {
1178                         $msg = wfMsgNoTrans( 'talkpageheader' );
1179                         if ( $msg !== '-' && !wfEmptyMsg( 'talkpageheader', $msg ) ) {
1180                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1</div>", array( 'talkpageheader' ) );
1181                         }
1182                 }
1183         }
1184
1185         /**
1186          * Show the footer section of an ordinary page view
1187          */
1188         public function showViewFooter() {
1189                 global $wgOut, $wgUseTrackbacks, $wgRequest;
1190                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1191                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1192                         $wgOut->addWikiMsg( 'anontalkpagetext' );
1193                 }
1194
1195                 # If we have been passed an &rcid= parameter, we want to give the user a
1196                 # chance to mark this new article as patrolled.
1197                 $this->showPatrolFooter();
1198
1199                 # Trackbacks
1200                 if ( $wgUseTrackbacks ) {
1201                         $this->addTrackbacks();
1202                 }
1203         }
1204
1205         /**
1206          * If patrol is possible, output a patrol UI box. This is called from the
1207          * footer section of ordinary page views. If patrol is not possible or not
1208          * desired, does nothing.
1209          */
1210         public function showPatrolFooter() {
1211                 global $wgOut, $wgRequest, $wgUser;
1212                 $rcid = $wgRequest->getVal( 'rcid' );
1213
1214                 if ( !$rcid || !$this->mTitle->exists() || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1215                         return;
1216                 }
1217
1218                 $sk = $wgUser->getSkin();
1219
1220                 $wgOut->addHTML(
1221                         "<div class='patrollink'>" .
1222                                 wfMsgHtml(
1223                                         'markaspatrolledlink',
1224                                         $sk->link(
1225                                                 $this->mTitle,
1226                                                 wfMsgHtml( 'markaspatrolledtext' ),
1227                                                 array(),
1228                                                 array(
1229                                                         'action' => 'markpatrolled',
1230                                                         'rcid' => $rcid
1231                                                 ),
1232                                                 array( 'known', 'noclasses' )
1233                                         )
1234                                 ) .
1235                         '</div>'
1236                 );
1237         }
1238
1239         /**
1240          * Show the error text for a missing article. For articles in the MediaWiki
1241          * namespace, show the default message text. To be called from Article::view().
1242          */
1243         public function showMissingArticle() {
1244                 global $wgOut, $wgRequest, $wgUser;
1245
1246                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1247                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1248                         $parts = explode( '/', $this->mTitle->getText() );
1249                         $rootPart = $parts[0];
1250                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1251                         $ip = User::isIP( $rootPart );
1252                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
1253                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1</div>",
1254                                         array( 'userpage-userdoesnotexist-view', $rootPart ) );
1255                         } else if ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1256                                 LogEventsList::showLogExtract(
1257                                         $wgOut,
1258                                         'block',
1259                                         $user->getUserPage()->getPrefixedText(),
1260                                         '',
1261                                         array(
1262                                                 'lim' => 1,
1263                                                 'showIfEmpty' => false,
1264                                                 'msgKey' => array(
1265                                                         'blocked-notice-logextract',
1266                                                         $user->getName() # Support GENDER in notice
1267                                                 )
1268                                         )
1269                                 );
1270                         }
1271                 }
1272                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1273                 # Show delete and move logs
1274                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1275                         array(  'lim' => 10,
1276                                 'conds' => array( "log_action != 'revision'" ),
1277                                 'showIfEmpty' => false,
1278                                 'msgKey' => array( 'moveddeleted-notice' ) )
1279                 );
1280
1281                 # Show error message
1282                 $oldid = $this->getOldID();
1283                 if ( $oldid ) {
1284                         $text = wfMsgNoTrans( 'missing-article',
1285                                 $this->mTitle->getPrefixedText(),
1286                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1287                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1288                         // Use the default message text
1289                         $text = $this->getContent();
1290                 } else {
1291                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1292                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1293                         $errors = array_merge( $createErrors, $editErrors );
1294
1295                         if ( !count( $errors ) )
1296                                 $text = wfMsgNoTrans( 'noarticletext' );
1297                         else
1298                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1299                 }
1300                 $text = "<div class='noarticletext'>\n$text\n</div>";
1301                 if ( !$this->hasViewableContent() ) {
1302                         // If there's no backing content, send a 404 Not Found
1303                         // for better machine handling of broken links.
1304                         $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
1305                 }
1306                 $wgOut->addWikiText( $text );
1307         }
1308
1309         /**
1310          * If the revision requested for view is deleted, check permissions.
1311          * Send either an error message or a warning header to $wgOut.
1312          *
1313          * @return boolean true if the view is allowed, false if not.
1314          */
1315         public function showDeletedRevisionHeader() {
1316                 global $wgOut, $wgRequest;
1317                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1318                         // Not deleted
1319                         return true;
1320                 }
1321                 // If the user is not allowed to see it...
1322                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1323                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
1324                                 'rev-deleted-text-permission' );
1325                         return false;
1326                 // If the user needs to confirm that they want to see it...
1327                 } else if ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1328                         # Give explanation and add a link to view the revision...
1329                         $oldid = intval( $this->getOldID() );
1330                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1331                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1332                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1333                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
1334                                 array( $msg, $link ) );
1335                         return false;
1336                 // We are allowed to see...
1337                 } else {
1338                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1339                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1340                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", $msg );
1341                         return true;
1342                 }
1343         }
1344
1345         /**
1346          * Should the parser cache be used?
1347          *
1348          * @return boolean
1349          */
1350         public function useParserCache( $oldid ) {
1351                 global $wgUser, $wgEnableParserCache;
1352
1353                 return $wgEnableParserCache
1354                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
1355                         && $this->exists()
1356                         && empty( $oldid )
1357                         && !$this->mTitle->isCssOrJsPage()
1358                         && !$this->mTitle->isCssJsSubpage();
1359         }
1360
1361         /**
1362          * Execute the uncached parse for action=view
1363          */
1364         public function doViewParse() {
1365                 global $wgOut;
1366                 $oldid = $this->getOldID();
1367                 $useParserCache = $this->useParserCache( $oldid );
1368                 $parserOptions = clone $this->getParserOptions();
1369                 # Render printable version, use printable version cache
1370                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1371                 # Don't show section-edit links on old revisions... this way lies madness.
1372                 $parserOptions->setEditSection( $this->isCurrent() );
1373                 $useParserCache = $this->useParserCache( $oldid );
1374                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1375         }
1376
1377         /**
1378          * Try to fetch an expired entry from the parser cache. If it is present,
1379          * output it and return true. If it is not present, output nothing and
1380          * return false. This is used as a callback function for
1381          * PoolCounter::executeProtected().
1382          *
1383          * @return boolean
1384          */
1385         public function tryDirtyCache() {
1386                 global $wgOut;
1387                 $parserCache = ParserCache::singleton();
1388                 $options = $this->getParserOptions();
1389                 $options->setIsPrintable( $wgOut->isPrintable() );
1390                 $output = $parserCache->getDirty( $this, $options );
1391                 if ( $output ) {
1392                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1393                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1394                         $wgOut->setSquidMaxage( 0 );
1395                         $this->mParserOutput = $output;
1396                         $wgOut->addParserOutput( $output );
1397                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1398                         return true;
1399                 } else {
1400                         wfDebugLog( 'dirty', "dirty missing\n" );
1401                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1402                         return false;
1403                 }
1404         }
1405
1406         /**
1407          * Show an error page for an error from the pool counter.
1408          * @param $status Status
1409          */
1410         public function showPoolError( $status ) {
1411                 global $wgOut;
1412                 $wgOut->clearHTML(); // for release() errors
1413                 $wgOut->enableClientCache( false );
1414                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1415                 $wgOut->addWikiText(
1416                         '<div class="errorbox">' .
1417                         $status->getWikiText( false, 'view-pool-error' ) .
1418                         '</div>'
1419                 );
1420         }
1421
1422         /**
1423          * View redirect
1424          *
1425          * @param $target Title object or Array of destination(s) to redirect
1426          * @param $appendSubtitle Boolean [optional]
1427          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1428          * @return string containing HMTL with redirect link
1429          */
1430         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1431                 global $wgOut, $wgContLang, $wgStylePath, $wgUser;
1432                 # Display redirect
1433                 if ( !is_array( $target ) ) {
1434                         $target = array( $target );
1435                 }
1436                 $imageDir = $wgContLang->getDir();
1437                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1438                 $imageUrl2 = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1439                 $alt2 = $wgContLang->isRTL() ? '&larr;' : '&rarr;'; // should -> and <- be used instead of entities?
1440
1441                 if ( $appendSubtitle ) {
1442                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1443                 }
1444                 $sk = $wgUser->getSkin();
1445                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1446                 $title = array_shift( $target );
1447                 if ( $forceKnown ) {
1448                         $link = $sk->link(
1449                                 $title,
1450                                 htmlspecialchars( $title->getFullText() ),
1451                                 array(),
1452                                 array(),
1453                                 array( 'known', 'noclasses' )
1454                         );
1455                 } else {
1456                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1457                 }
1458                 // automatically append redirect=no to each link, since most of them are redirect pages themselves
1459                 foreach ( $target as $rt ) {
1460                         if ( $forceKnown ) {
1461                                 $link .= '<img src="' . $imageUrl2 . '" alt="' . $alt2 . ' " />'
1462                                         . $sk->link(
1463                                                 $rt,
1464                                                 htmlspecialchars( $rt->getFullText() ),
1465                                                 array(),
1466                                                 array(),
1467                                                 array( 'known', 'noclasses' )
1468                                         );
1469                         } else {
1470                                 $link .= '<img src="' . $imageUrl2 . '" alt="' . $alt2 . ' " />'
1471                                         . $sk->link( $rt, htmlspecialchars( $rt->getFullText() ) );
1472                         }
1473                 }
1474                 return '<img src="' . $imageUrl . '" alt="#REDIRECT " />' .
1475                         '<span class="redirectText">' . $link . '</span>';
1476
1477         }
1478
1479         /**
1480          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1481          */
1482         public function addTrackbacks() {
1483                 global $wgOut, $wgUser;
1484                 $dbr = wfGetDB( DB_SLAVE );
1485                 $tbs = $dbr->select( 'trackbacks',
1486                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1487                         array( 'tb_page' => $this->getID() )
1488                 );
1489                 if ( !$dbr->numRows( $tbs ) ) return;
1490
1491                 $tbtext = "";
1492                 while ( $o = $dbr->fetchObject( $tbs ) ) {
1493                         $rmvtxt = "";
1494                         if ( $wgUser->isAllowed( 'trackback' ) ) {
1495                                 $delurl = $this->mTitle->getFullURL( "action=deletetrackback&tbid=" .
1496                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1497                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1498                         }
1499                         $tbtext .= "\n";
1500                         $tbtext .= wfMsg( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1501                                         $o->tb_title,
1502                                         $o->tb_url,
1503                                         $o->tb_ex,
1504                                         $o->tb_name,
1505                                         $rmvtxt );
1506                 }
1507                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>$1</div>\n", array( 'trackbackbox', $tbtext ) );
1508         }
1509
1510         /**
1511          * Removes trackback record for current article from trackbacks table
1512          */
1513         public function deletetrackback() {
1514                 global $wgUser, $wgRequest, $wgOut;
1515                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
1516                         $wgOut->addWikiMsg( 'sessionfailure' );
1517                         return;
1518                 }
1519
1520                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1521                 if ( count( $permission_errors ) ) {
1522                         $wgOut->showPermissionsErrorPage( $permission_errors );
1523                         return;
1524                 }
1525
1526                 $db = wfGetDB( DB_MASTER );
1527                 $db->delete( 'trackbacks', array( 'tb_id' => $wgRequest->getInt( 'tbid' ) ) );
1528
1529                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1530                 $this->mTitle->invalidateCache();
1531         }
1532
1533         /**
1534          * Handle action=render
1535          */
1536
1537         public function render() {
1538                 global $wgOut;
1539                 $wgOut->setArticleBodyOnly( true );
1540                 $this->view();
1541         }
1542
1543         /**
1544          * Handle action=purge
1545          */
1546         public function purge() {
1547                 global $wgUser, $wgRequest, $wgOut;
1548                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1549                         if ( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1550                                 $this->doPurge();
1551                                 $this->view();
1552                         }
1553                 } else {
1554                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1555                         $button = wfMsgExt( 'confirm_purge_button', array( 'escapenoentities' ) );
1556                         $form = "<form method=\"post\" action=\"$action\">\n" .
1557                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1558                                         "</form>\n";
1559                         $top = wfMsgExt( 'confirm-purge-top', array( 'parse' ) );
1560                         $bottom = wfMsgExt( 'confirm-purge-bottom', array( 'parse' ) );
1561                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1562                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1563                         $wgOut->addHTML( $top . $form . $bottom );
1564                 }
1565         }
1566
1567         /**
1568          * Perform the actions of a page purging
1569          */
1570         public function doPurge() {
1571                 global $wgUseSquid;
1572                 // Invalidate the cache
1573                 $this->mTitle->invalidateCache();
1574
1575                 if ( $wgUseSquid ) {
1576                         // Commit the transaction before the purge is sent
1577                         $dbw = wfGetDB( DB_MASTER );
1578                         $dbw->commit();
1579
1580                         // Send purge
1581                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1582                         $update->doUpdate();
1583                 }
1584                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1585                         global $wgMessageCache;
1586                         if ( $this->getID() == 0 ) {
1587                                 $text = false;
1588                         } else {
1589                                 $text = $this->getRawText();
1590                         }
1591                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1592                 }
1593         }
1594
1595         /**
1596          * Insert a new empty page record for this article.
1597          * This *must* be followed up by creating a revision
1598          * and running $this->updateToLatest( $rev_id );
1599          * or else the record will be left in a funky state.
1600          * Best if all done inside a transaction.
1601          *
1602          * @param $dbw Database
1603          * @return int The newly created page_id key, or false if the title already existed
1604          * @private
1605          */
1606         public function insertOn( $dbw ) {
1607                 wfProfileIn( __METHOD__ );
1608
1609                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1610                 $dbw->insert( 'page', array(
1611                         'page_id'           => $page_id,
1612                         'page_namespace'    => $this->mTitle->getNamespace(),
1613                         'page_title'        => $this->mTitle->getDBkey(),
1614                         'page_counter'      => 0,
1615                         'page_restrictions' => '',
1616                         'page_is_redirect'  => 0, # Will set this shortly...
1617                         'page_is_new'       => 1,
1618                         'page_random'       => wfRandom(),
1619                         'page_touched'      => $dbw->timestamp(),
1620                         'page_latest'       => 0, # Fill this in shortly...
1621                         'page_len'          => 0, # Fill this in shortly...
1622                 ), __METHOD__, 'IGNORE' );
1623
1624                 $affected = $dbw->affectedRows();
1625                 if ( $affected ) {
1626                         $newid = $dbw->insertId();
1627                         $this->mTitle->resetArticleId( $newid );
1628                 }
1629                 wfProfileOut( __METHOD__ );
1630                 return $affected ? $newid : false;
1631         }
1632
1633         /**
1634          * Update the page record to point to a newly saved revision.
1635          *
1636          * @param $dbw Database object
1637          * @param $revision Revision: For ID number, and text used to set
1638                             length and redirect status fields
1639          * @param $lastRevision Integer: if given, will not overwrite the page field
1640          *                      when different from the currently set value.
1641          *                      Giving 0 indicates the new page flag should be set
1642          *                      on.
1643          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1644          *                           removing rows in redirect table.
1645          * @return bool true on success, false on failure
1646          * @private
1647          */
1648         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1649                 wfProfileIn( __METHOD__ );
1650
1651                 $text = $revision->getText();
1652                 $rt = Title::newFromRedirect( $text );
1653
1654                 $conditions = array( 'page_id' => $this->getId() );
1655                 if ( !is_null( $lastRevision ) ) {
1656                         # An extra check against threads stepping on each other
1657                         $conditions['page_latest'] = $lastRevision;
1658                 }
1659
1660                 $dbw->update( 'page',
1661                         array( /* SET */
1662                                 'page_latest'      => $revision->getId(),
1663                                 'page_touched'     => $dbw->timestamp(),
1664                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1665                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1666                                 'page_len'         => strlen( $text ),
1667                         ),
1668                         $conditions,
1669                         __METHOD__ );
1670
1671                 $result = $dbw->affectedRows() != 0;
1672                 if ( $result ) {
1673                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1674                 }
1675
1676                 wfProfileOut( __METHOD__ );
1677                 return $result;
1678         }
1679
1680         /**
1681          * Add row to the redirect table if this is a redirect, remove otherwise.
1682          *
1683          * @param $dbw Database
1684          * @param $redirectTitle a title object pointing to the redirect target,
1685          *                       or NULL if this is not a redirect
1686          * @param $lastRevIsRedirect If given, will optimize adding and
1687          *                           removing rows in redirect table.
1688          * @return bool true on success, false on failure
1689          * @private
1690          */
1691         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1692                 // Always update redirects (target link might have changed)
1693                 // Update/Insert if we don't know if the last revision was a redirect or not
1694                 // Delete if changing from redirect to non-redirect
1695                 $isRedirect = !is_null( $redirectTitle );
1696                 if ( $isRedirect || is_null( $lastRevIsRedirect ) || $lastRevIsRedirect !== $isRedirect ) {
1697                         wfProfileIn( __METHOD__ );
1698                         if ( $isRedirect ) {
1699                                 // This title is a redirect, Add/Update row in the redirect table
1700                                 $set = array( /* SET */
1701                                         'rd_namespace' => $redirectTitle->getNamespace(),
1702                                         'rd_title'     => $redirectTitle->getDBkey(),
1703                                         'rd_from'      => $this->getId(),
1704                                 );
1705                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1706                         } else {
1707                                 // This is not a redirect, remove row from redirect table
1708                                 $where = array( 'rd_from' => $this->getId() );
1709                                 $dbw->delete( 'redirect', $where, __METHOD__ );
1710                         }
1711                         if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1712                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1713                         }
1714                         wfProfileOut( __METHOD__ );
1715                         return ( $dbw->affectedRows() != 0 );
1716                 }
1717                 return true;
1718         }
1719
1720         /**
1721          * If the given revision is newer than the currently set page_latest,
1722          * update the page record. Otherwise, do nothing.
1723          *
1724          * @param $dbw Database object
1725          * @param $revision Revision object
1726          * @return mixed
1727          */
1728         public function updateIfNewerOn( &$dbw, $revision ) {
1729                 wfProfileIn( __METHOD__ );
1730                 $row = $dbw->selectRow(
1731                         array( 'revision', 'page' ),
1732                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1733                         array(
1734                                 'page_id' => $this->getId(),
1735                                 'page_latest=rev_id' ),
1736                         __METHOD__ );
1737                 if ( $row ) {
1738                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1739                                 wfProfileOut( __METHOD__ );
1740                                 return false;
1741                         }
1742                         $prev = $row->rev_id;
1743                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1744                 } else {
1745                         # No or missing previous revision; mark the page as new
1746                         $prev = 0;
1747                         $lastRevIsRedirect = null;
1748                 }
1749                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1750                 wfProfileOut( __METHOD__ );
1751                 return $ret;
1752         }
1753
1754         /**
1755          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1756          * @return string Complete article text, or null if error
1757          */
1758         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1759                 wfProfileIn( __METHOD__ );
1760                 if ( strval( $section ) == '' ) {
1761                         // Whole-page edit; let the whole text through
1762                 } else {
1763                         if ( is_null( $edittime ) ) {
1764                                 $rev = Revision::newFromTitle( $this->mTitle );
1765                         } else {
1766                                 $dbw = wfGetDB( DB_MASTER );
1767                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1768                         }
1769                         if ( !$rev ) {
1770                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1771                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1772                                 return null;
1773                         }
1774                         $oldtext = $rev->getText();
1775
1776                         if ( $section == 'new' ) {
1777                                 # Inserting a new section
1778                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1779                                 $text = strlen( trim( $oldtext ) ) > 0
1780                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1781                                                 : "{$subject}{$text}";
1782                         } else {
1783                                 # Replacing an existing section; roll out the big guns
1784                                 global $wgParser;
1785                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1786                         }
1787                 }
1788                 wfProfileOut( __METHOD__ );
1789                 return $text;
1790         }
1791
1792         /**
1793          * This function is not deprecated until somebody fixes the core not to use
1794          * it. Nevertheless, use Article::doEdit() instead.
1795          */
1796         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC = false, $comment = false, $bot = false ) {
1797                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1798                         ( $isminor ? EDIT_MINOR : 0 ) |
1799                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1800                         ( $bot ? EDIT_FORCE_BOT : 0 );
1801
1802                 # If this is a comment, add the summary as headline
1803                 if ( $comment && $summary != "" ) {
1804                         $text = wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" . $text;
1805                 }
1806
1807                 $this->doEdit( $text, $summary, $flags );
1808
1809                 $dbw = wfGetDB( DB_MASTER );
1810                 if ( $watchthis ) {
1811                         if ( !$this->mTitle->userIsWatching() ) {
1812                                 $dbw->begin();
1813                                 $this->doWatch();
1814                                 $dbw->commit();
1815                         }
1816                 } else {
1817                         if ( $this->mTitle->userIsWatching() ) {
1818                                 $dbw->begin();
1819                                 $this->doUnwatch();
1820                                 $dbw->commit();
1821                         }
1822                 }
1823                 $this->doRedirect( $this->isRedirect( $text ) );
1824         }
1825
1826         /**
1827          * @deprecated use Article::doEdit()
1828          */
1829         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1830                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1831                         ( $minor ? EDIT_MINOR : 0 ) |
1832                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1833
1834                 $status = $this->doEdit( $text, $summary, $flags );
1835                 if ( !$status->isOK() ) {
1836                         return false;
1837                 }
1838
1839                 $dbw = wfGetDB( DB_MASTER );
1840                 if ( $watchthis ) {
1841                         if ( !$this->mTitle->userIsWatching() ) {
1842                                 $dbw->begin();
1843                                 $this->doWatch();
1844                                 $dbw->commit();
1845                         }
1846                 } else {
1847                         if ( $this->mTitle->userIsWatching() ) {
1848                                 $dbw->begin();
1849                                 $this->doUnwatch();
1850                                 $dbw->commit();
1851                         }
1852                 }
1853
1854                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1855                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1856
1857                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1858                 return true;
1859         }
1860
1861         /**
1862          * Article::doEdit()
1863          *
1864          * Change an existing article or create a new article. Updates RC and all necessary caches,
1865          * optionally via the deferred update array.
1866          *
1867          * $wgUser must be set before calling this function.
1868          *
1869          * @param $text String: new text
1870          * @param $summary String: edit summary
1871          * @param $flags Integer bitfield:
1872          *      EDIT_NEW
1873          *          Article is known or assumed to be non-existent, create a new one
1874          *      EDIT_UPDATE
1875          *          Article is known or assumed to be pre-existing, update it
1876          *      EDIT_MINOR
1877          *          Mark this edit minor, if the user is allowed to do so
1878          *      EDIT_SUPPRESS_RC
1879          *          Do not log the change in recentchanges
1880          *      EDIT_FORCE_BOT
1881          *          Mark the edit a "bot" edit regardless of user rights
1882          *      EDIT_DEFER_UPDATES
1883          *          Defer some of the updates until the end of index.php
1884          *      EDIT_AUTOSUMMARY
1885          *          Fill in blank summaries with generated text where possible
1886          *
1887          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1888          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1889          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1890          * edit-already-exists error will be returned. These two conditions are also possible with
1891          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1892          *
1893          * @param $baseRevId the revision ID this edit was based off, if any
1894          * @param $user Optional user object, $wgUser will be used if not passed
1895          *
1896          * @return Status object. Possible errors:
1897          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1898          *     edit-gone-missing:       In update mode, but the article didn't exist
1899          *     edit-conflict:           In update mode, the article changed unexpectedly
1900          *     edit-no-change:          Warning that the text was the same as before
1901          *     edit-already-exists:     In creation mode, but the article already exists
1902          *
1903          *  Extensions may define additional errors.
1904          *
1905          *  $return->value will contain an associative array with members as follows:
1906          *     new:                     Boolean indicating if the function attempted to create a new article
1907          *     revision:                The revision object for the inserted revision, or null
1908          *
1909          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1910          */
1911         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1912                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1913
1914                 # Low-level sanity check
1915                 if ( $this->mTitle->getText() == '' ) {
1916                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1917                 }
1918
1919                 wfProfileIn( __METHOD__ );
1920
1921                 $user = is_null( $user ) ? $wgUser : $user;
1922                 $status = Status::newGood( array() );
1923
1924                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1925                 $this->loadPageData();
1926
1927                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1928                         $aid = $this->mTitle->getArticleID();
1929                         if ( $aid ) {
1930                                 $flags |= EDIT_UPDATE;
1931                         } else {
1932                                 $flags |= EDIT_NEW;
1933                         }
1934                 }
1935
1936                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1937                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1938                 {
1939                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1940                         wfProfileOut( __METHOD__ );
1941                         if ( $status->isOK() ) {
1942                                 $status->fatal( 'edit-hook-aborted' );
1943                         }
1944                         return $status;
1945                 }
1946
1947                 # Silently ignore EDIT_MINOR if not allowed
1948                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1949                 $bot = $flags & EDIT_FORCE_BOT;
1950
1951                 $oldtext = $this->getRawText(); // current revision
1952                 $oldsize = strlen( $oldtext );
1953
1954                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1955                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1956                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1957                 }
1958
1959                 $editInfo = $this->prepareTextForEdit( $text );
1960                 $text = $editInfo->pst;
1961                 $newsize = strlen( $text );
1962
1963                 $dbw = wfGetDB( DB_MASTER );
1964                 $now = wfTimestampNow();
1965                 $this->mTimestamp = $now;
1966
1967                 if ( $flags & EDIT_UPDATE ) {
1968                         # Update article, but only if changed.
1969                         $status->value['new'] = false;
1970                         # Make sure the revision is either completely inserted or not inserted at all
1971                         if ( !$wgDBtransactions ) {
1972                                 $userAbort = ignore_user_abort( true );
1973                         }
1974
1975                         $revisionId = 0;
1976
1977                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1978
1979                         if ( $changed ) {
1980                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1981                                   - (int)$this->isCountable( $oldtext );
1982                                 $this->mTotalAdjustment = 0;
1983
1984                                 if ( !$this->mLatest ) {
1985                                         # Article gone missing
1986                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1987                                         $status->fatal( 'edit-gone-missing' );
1988                                         wfProfileOut( __METHOD__ );
1989                                         return $status;
1990                                 }
1991
1992                                 $revision = new Revision( array(
1993                                         'page'       => $this->getId(),
1994                                         'comment'    => $summary,
1995                                         'minor_edit' => $isminor,
1996                                         'text'       => $text,
1997                                         'parent_id'  => $this->mLatest,
1998                                         'user'       => $user->getId(),
1999                                         'user_text'  => $user->getName(),
2000                                         ) );
2001
2002                                 $dbw->begin();
2003                                 $revisionId = $revision->insertOn( $dbw );
2004
2005                                 # Update page
2006                                 #
2007                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
2008                                 # during the course of this function. This makes sure that EditPage can detect
2009                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
2010                                 # before this function is called. A previous function used a separate query, this
2011                                 # creates a window where concurrent edits can cause an ignored edit conflict.
2012                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
2013
2014                                 if ( !$ok ) {
2015                                         /* Belated edit conflict! Run away!! */
2016                                         $status->fatal( 'edit-conflict' );
2017                                         # Delete the invalid revision if the DB is not transactional
2018                                         if ( !$wgDBtransactions ) {
2019                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
2020                                         }
2021                                         $revisionId = 0;
2022                                         $dbw->rollback();
2023                                 } else {
2024                                         global $wgUseRCPatrol;
2025                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
2026                                         # Update recentchanges
2027                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2028                                                 # Mark as patrolled if the user can do so
2029                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan( 'autopatrol' );
2030                                                 # Add RC row to the DB
2031                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
2032                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
2033                                                         $revisionId, $patrolled
2034                                                 );
2035                                                 # Log auto-patrolled edits
2036                                                 if ( $patrolled ) {
2037                                                         PatrolLog::record( $rc, true );
2038                                                 }
2039                                         }
2040                                         $user->incEditCount();
2041                                         $dbw->commit();
2042                                 }
2043                         } else {
2044                                 $status->warning( 'edit-no-change' );
2045                                 $revision = null;
2046                                 // Keep the same revision ID, but do some updates on it
2047                                 $revisionId = $this->getRevIdFetched();
2048                                 // Update page_touched, this is usually implicit in the page update
2049                                 // Other cache updates are done in onArticleEdit()
2050                                 $this->mTitle->invalidateCache();
2051                         }
2052
2053                         if ( !$wgDBtransactions ) {
2054                                 ignore_user_abort( $userAbort );
2055                         }
2056                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2057                         if ( !$status->isOK() ) {
2058                                 wfProfileOut( __METHOD__ );
2059                                 return $status;
2060                         }
2061
2062                         # Invalidate cache of this article and all pages using this article
2063                         # as a template. Partly deferred.
2064                         Article::onArticleEdit( $this->mTitle );
2065                         # Update links tables, site stats, etc.
2066                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
2067                 } else {
2068                         # Create new article
2069                         $status->value['new'] = true;
2070
2071                         # Set statistics members
2072                         # We work out if it's countable after PST to avoid counter drift
2073                         # when articles are created with {{subst:}}
2074                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2075                         $this->mTotalAdjustment = 1;
2076
2077                         $dbw->begin();
2078
2079                         # Add the page record; stake our claim on this title!
2080                         # This will return false if the article already exists
2081                         $newid = $this->insertOn( $dbw );
2082
2083                         if ( $newid === false ) {
2084                                 $dbw->rollback();
2085                                 $status->fatal( 'edit-already-exists' );
2086                                 wfProfileOut( __METHOD__ );
2087                                 return $status;
2088                         }
2089
2090                         # Save the revision text...
2091                         $revision = new Revision( array(
2092                                 'page'       => $newid,
2093                                 'comment'    => $summary,
2094                                 'minor_edit' => $isminor,
2095                                 'text'       => $text,
2096                                 'user'       => $user->getId(),
2097                                 'user_text'  => $user->getName(),
2098                                 ) );
2099                         $revisionId = $revision->insertOn( $dbw );
2100
2101                         $this->mTitle->resetArticleID( $newid );
2102
2103                         # Update the page record with revision data
2104                         $this->updateRevisionOn( $dbw, $revision, 0 );
2105
2106                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2107                         # Update recentchanges
2108                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2109                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2110                                 # Mark as patrolled if the user can do so
2111                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && $this->mTitle->userCan( 'autopatrol' );
2112                                 # Add RC row to the DB
2113                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2114                                         '', strlen( $text ), $revisionId, $patrolled );
2115                                 # Log auto-patrolled edits
2116                                 if ( $patrolled ) {
2117                                         PatrolLog::record( $rc, true );
2118                                 }
2119                         }
2120                         $user->incEditCount();
2121                         $dbw->commit();
2122
2123                         # Update links, etc.
2124                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
2125
2126                         # Clear caches
2127                         Article::onArticleCreate( $this->mTitle );
2128
2129                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2130                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
2131                 }
2132
2133                 # Do updates right now unless deferral was requested
2134                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2135                         wfDoUpdates();
2136                 }
2137
2138                 // Return the new revision (or null) to the caller
2139                 $status->value['revision'] = $revision;
2140
2141                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2142                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
2143
2144                 wfProfileOut( __METHOD__ );
2145                 return $status;
2146         }
2147
2148         /**
2149          * @deprecated wrapper for doRedirect
2150          */
2151         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
2152                 wfDeprecated( __METHOD__ );
2153                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
2154         }
2155
2156         /**
2157          * Output a redirect back to the article.
2158          * This is typically used after an edit.
2159          *
2160          * @param $noRedir Boolean: add redirect=no
2161          * @param $sectionAnchor String: section to redirect to, including "#"
2162          * @param $extraQuery String: extra query params
2163          */
2164         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2165                 global $wgOut;
2166                 if ( $noRedir ) {
2167                         $query = 'redirect=no';
2168                         if ( $extraQuery )
2169                                 $query .= "&$query";
2170                 } else {
2171                         $query = $extraQuery;
2172                 }
2173                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2174         }
2175
2176         /**
2177          * Mark this particular edit/page as patrolled
2178          */
2179         public function markpatrolled() {
2180                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
2181                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2182
2183                 # If we haven't been given an rc_id value, we can't do anything
2184                 $rcid = (int) $wgRequest->getVal( 'rcid' );
2185                 $rc = RecentChange::newFromId( $rcid );
2186                 if ( is_null( $rc ) ) {
2187                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2188                         return;
2189                 }
2190
2191                 # It would be nice to see where the user had actually come from, but for now just guess
2192                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2193                 $return = SpecialPage::getTitleFor( $returnto );
2194
2195                 $dbw = wfGetDB( DB_MASTER );
2196                 $errors = $rc->doMarkPatrolled();
2197
2198                 if ( in_array( array( 'rcpatroldisabled' ), $errors ) ) {
2199                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2200                         return;
2201                 }
2202
2203                 if ( in_array( array( 'hookaborted' ), $errors ) ) {
2204                         // The hook itself has handled any output
2205                         return;
2206                 }
2207
2208                 if ( in_array( array( 'markedaspatrollederror-noautopatrol' ), $errors ) ) {
2209                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2210                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2211                         $wgOut->returnToMain( false, $return );
2212                         return;
2213                 }
2214
2215                 if ( !empty( $errors ) ) {
2216                         $wgOut->showPermissionsErrorPage( $errors );
2217                         return;
2218                 }
2219
2220                 # Inform the user
2221                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2222                 $wgOut->addWikiMsg( 'markedaspatrolledtext', $rc->getTitle()->getPrefixedText() );
2223                 $wgOut->returnToMain( false, $return );
2224         }
2225
2226         /**
2227          * User-interface handler for the "watch" action
2228          */
2229         public function watch() {
2230                 global $wgUser, $wgOut;
2231                 if ( $wgUser->isAnon() ) {
2232                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2233                         return;
2234                 }
2235                 if ( wfReadOnly() ) {
2236                         $wgOut->readOnlyPage();
2237                         return;
2238                 }
2239                 if ( $this->doWatch() ) {
2240                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
2241                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2242                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
2243                 }
2244                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2245         }
2246
2247         /**
2248          * Add this page to $wgUser's watchlist
2249          * @return bool true on successful watch operation
2250          */
2251         public function doWatch() {
2252                 global $wgUser;
2253                 if ( $wgUser->isAnon() ) {
2254                         return false;
2255                 }
2256                 if ( wfRunHooks( 'WatchArticle', array( &$wgUser, &$this ) ) ) {
2257                         $wgUser->addWatch( $this->mTitle );
2258                         return wfRunHooks( 'WatchArticleComplete', array( &$wgUser, &$this ) );
2259                 }
2260                 return false;
2261         }
2262
2263         /**
2264          * User interface handler for the "unwatch" action.
2265          */
2266         public function unwatch() {
2267                 global $wgUser, $wgOut;
2268                 if ( $wgUser->isAnon() ) {
2269                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2270                         return;
2271                 }
2272                 if ( wfReadOnly() ) {
2273                         $wgOut->readOnlyPage();
2274                         return;
2275                 }
2276                 if ( $this->doUnwatch() ) {
2277                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
2278                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2279                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
2280                 }
2281                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2282         }
2283
2284         /**
2285          * Stop watching a page
2286          * @return bool true on successful unwatch
2287          */
2288         public function doUnwatch() {
2289                 global $wgUser;
2290                 if ( $wgUser->isAnon() ) {
2291                         return false;
2292                 }
2293                 if ( wfRunHooks( 'UnwatchArticle', array( &$wgUser, &$this ) ) ) {
2294                         $wgUser->removeWatch( $this->mTitle );
2295                         return wfRunHooks( 'UnwatchArticleComplete', array( &$wgUser, &$this ) );
2296                 }
2297                 return false;
2298         }
2299
2300         /**
2301          * action=protect handler
2302          */
2303         public function protect() {
2304                 $form = new ProtectionForm( $this );
2305                 $form->execute();
2306         }
2307
2308         /**
2309          * action=unprotect handler (alias)
2310          */
2311         public function unprotect() {
2312                 $this->protect();
2313         }
2314
2315         /**
2316          * Update the article's restriction field, and leave a log entry.
2317          *
2318          * @param $limit Array: set of restriction keys
2319          * @param $reason String
2320          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2321          * @param $expiry Array: per restriction type expiration
2322          * @return bool true on success
2323          */
2324         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2325                 global $wgUser, $wgContLang;
2326
2327                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2328
2329                 $id = $this->mTitle->getArticleID();
2330                 if ( $id <= 0 ) {
2331                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
2332                         return false;
2333                 }
2334
2335                 if ( wfReadOnly() ) {
2336                         wfDebug( "updateRestrictions failed: read-only\n" );
2337                         return false;
2338                 }
2339
2340                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2341                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2342                         return false;
2343                 }
2344
2345                 if ( !$cascade ) {
2346                         $cascade = false;
2347                 }
2348
2349                 // Take this opportunity to purge out expired restrictions
2350                 Title::purgeExpiredRestrictions();
2351
2352                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2353                 # we expect a single selection, but the schema allows otherwise.
2354                 $current = array();
2355                 $updated = Article::flattenRestrictions( $limit );
2356                 $changed = false;
2357                 foreach ( $restrictionTypes as $action ) {
2358                         if ( isset( $expiry[$action] ) ) {
2359                                 # Get current restrictions on $action
2360                                 $aLimits = $this->mTitle->getRestrictions( $action );
2361                                 $current[$action] = implode( '', $aLimits );
2362                                 # Are any actual restrictions being dealt with here?
2363                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
2364                                 # If something changed, we need to log it. Checking $aRChanged
2365                                 # assures that "unprotecting" a page that is not protected does
2366                                 # not log just because the expiry was "changed".
2367                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2368                                         $changed = true;
2369                                 }
2370                         }
2371                 }
2372
2373                 $current = Article::flattenRestrictions( $current );
2374
2375                 $changed = ( $changed || $current != $updated );
2376                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
2377                 $protect = ( $updated != '' );
2378
2379                 # If nothing's changed, do nothing
2380                 if ( $changed ) {
2381                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2382
2383                                 $dbw = wfGetDB( DB_MASTER );
2384
2385                                 # Prepare a null revision to be added to the history
2386                                 $modified = $current != '' && $protect;
2387                                 if ( $protect ) {
2388                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2389                                 } else {
2390                                         $comment_type = 'unprotectedarticle';
2391                                 }
2392                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2393
2394                                 # Only restrictions with the 'protect' right can cascade...
2395                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2396                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2397                                 # The schema allows multiple restrictions
2398                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) )
2399                                         $cascade = false;
2400                                 $cascade_description = '';
2401                                 if ( $cascade ) {
2402                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2403                                 }
2404
2405                                 if ( $reason )
2406                                         $comment .= ": $reason";
2407
2408                                 $editComment = $comment;
2409                                 $encodedExpiry = array();
2410                                 $protect_description = '';
2411                                 foreach ( $limit as $action => $restrictions  ) {
2412                                         if ( !isset( $expiry[$action] ) )
2413                                                 $expiry[$action] = 'infinite';
2414
2415                                         $encodedExpiry[$action] = Block::encodeExpiry( $expiry[$action], $dbw );
2416                                         if ( $restrictions != '' ) {
2417                                                 $protect_description .= "[$action=$restrictions] (";
2418                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2419                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2420                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2421                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2422                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2423                                                 } else {
2424                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2425                                                 }
2426                                                 $protect_description .= ') ';
2427                                         }
2428                                 }
2429                                 $protect_description = trim( $protect_description );
2430
2431                                 if ( $protect_description && $protect )
2432                                         $editComment .= " ($protect_description)";
2433                                 if ( $cascade )
2434                                         $editComment .= "$cascade_description";
2435                                 # Update restrictions table
2436                                 foreach ( $limit as $action => $restrictions ) {
2437                                         if ( $restrictions != '' ) {
2438                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2439                                                         array( 'pr_page' => $id,
2440                                                                 'pr_type' => $action,
2441                                                                 'pr_level' => $restrictions,
2442                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2443                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
2444                                         } else {
2445                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2446                                                         'pr_type' => $action ), __METHOD__ );
2447                                         }
2448                                 }
2449
2450                                 # Insert a null revision
2451                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2452                                 $nullRevId = $nullRevision->insertOn( $dbw );
2453
2454                                 $latest = $this->getLatest();
2455                                 # Update page record
2456                                 $dbw->update( 'page',
2457                                         array( /* SET */
2458                                                 'page_touched' => $dbw->timestamp(),
2459                                                 'page_restrictions' => '',
2460                                                 'page_latest' => $nullRevId
2461                                         ), array( /* WHERE */
2462                                                 'page_id' => $id
2463                                         ), 'Article::protect'
2464                                 );
2465
2466                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
2467                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2468
2469                                 # Update the protection log
2470                                 $log = new LogPage( 'protect' );
2471                                 if ( $protect ) {
2472                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
2473                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
2474                                 } else {
2475                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2476                                 }
2477
2478                         } # End hook
2479                 } # End "changed" check
2480
2481                 return true;
2482         }
2483
2484         /**
2485          * Take an array of page restrictions and flatten it to a string
2486          * suitable for insertion into the page_restrictions field.
2487          * @param $limit Array
2488          * @return String
2489          */
2490         protected static function flattenRestrictions( $limit ) {
2491                 if ( !is_array( $limit ) ) {
2492                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2493                 }
2494                 $bits = array();
2495                 ksort( $limit );
2496                 foreach ( $limit as $action => $restrictions ) {
2497                         if ( $restrictions != '' ) {
2498                                 $bits[] = "$action=$restrictions";
2499                         }
2500                 }
2501                 return implode( ':', $bits );
2502         }
2503
2504         /**
2505          * Auto-generates a deletion reason
2506          *
2507          * @param &$hasHistory Boolean: whether the page has a history
2508          * @return mixed String containing deletion reason or empty string, or boolean false
2509          *    if no revision occurred
2510          */
2511         public function generateReason( &$hasHistory ) {
2512                 global $wgContLang;
2513                 $dbw = wfGetDB( DB_MASTER );
2514                 // Get the last revision
2515                 $rev = Revision::newFromTitle( $this->mTitle );
2516                 if ( is_null( $rev ) )
2517                         return false;
2518
2519                 // Get the article's contents
2520                 $contents = $rev->getText();
2521                 $blank = false;
2522                 // If the page is blank, use the text from the previous revision,
2523                 // which can only be blank if there's a move/import/protect dummy revision involved
2524                 if ( $contents == '' ) {
2525                         $prev = $rev->getPrevious();
2526                         if ( $prev )    {
2527                                 $contents = $prev->getText();
2528                                 $blank = true;
2529                         }
2530                 }
2531
2532                 // Find out if there was only one contributor
2533                 // Only scan the last 20 revisions
2534                 $res = $dbw->select( 'revision', 'rev_user_text',
2535                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2536                         __METHOD__,
2537                         array( 'LIMIT' => 20 )
2538                 );
2539                 if ( $res === false )
2540                         // This page has no revisions, which is very weird
2541                         return false;
2542
2543                 $hasHistory = ( $res->numRows() > 1 );
2544                 $row = $dbw->fetchObject( $res );
2545                 if ( $row ) { // $row is false if the only contributor is hidden
2546                         $onlyAuthor = $row->rev_user_text;
2547                         // Try to find a second contributor
2548                         foreach ( $res as $row ) {
2549                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2550                                         $onlyAuthor = false;
2551                                         break;
2552                                 }
2553                         }
2554                 } else {
2555                         $onlyAuthor = false;
2556                 }
2557                 $dbw->freeResult( $res );
2558
2559                 // Generate the summary with a '$1' placeholder
2560                 if ( $blank ) {
2561                         // The current revision is blank and the one before is also
2562                         // blank. It's just not our lucky day
2563                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2564                 } else {
2565                         if ( $onlyAuthor )
2566                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2567                         else
2568                                 $reason = wfMsgForContent( 'excontent', '$1' );
2569                 }
2570
2571                 if ( $reason == '-' ) {
2572                         // Allow these UI messages to be blanked out cleanly
2573                         return '';
2574                 }
2575
2576                 // Replace newlines with spaces to prevent uglyness
2577                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2578                 // Calculate the maximum amount of chars to get
2579                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2580                 $maxLength = 255 - ( strlen( $reason ) - 2 ) - 3;
2581                 $contents = $wgContLang->truncate( $contents, $maxLength );
2582                 // Remove possible unfinished links
2583                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2584                 // Now replace the '$1' placeholder
2585                 $reason = str_replace( '$1', $contents, $reason );
2586                 return $reason;
2587         }
2588
2589
2590         /*
2591          * UI entry point for page deletion
2592          */
2593         public function delete() {
2594                 global $wgUser, $wgOut, $wgRequest;
2595
2596                 $confirm = $wgRequest->wasPosted() &&
2597                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2598
2599                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2600                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2601
2602                 $reason = $this->DeleteReasonList;
2603
2604                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
2605                         // Entry from drop down menu + additional comment
2606                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2607                 } elseif ( $reason == 'other' ) {
2608                         $reason = $this->DeleteReason;
2609                 }
2610                 # Flag to hide all contents of the archived revisions
2611                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2612
2613                 # This code desperately needs to be totally rewritten
2614
2615                 # Read-only check...
2616                 if ( wfReadOnly() ) {
2617                         $wgOut->readOnlyPage();
2618                         return;
2619                 }
2620
2621                 # Check permissions
2622                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2623
2624                 if ( count( $permission_errors ) > 0 ) {
2625                         $wgOut->showPermissionsErrorPage( $permission_errors );
2626                         return;
2627                 }
2628
2629                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2630
2631                 # Better double-check that it hasn't been deleted yet!
2632                 $dbw = wfGetDB( DB_MASTER );
2633                 $conds = $this->mTitle->pageCond();
2634                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2635                 if ( $latest === false ) {
2636                         $wgOut->showFatalError(
2637                                 Html::rawElement(
2638                                         'div',
2639                                         array( 'class' => 'error mw-error-cannotdelete' ),
2640                                         wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2641                                 )
2642                         );
2643                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2644                         LogEventsList::showLogExtract(
2645                                 $wgOut,
2646                                 'delete',
2647                                 $this->mTitle->getPrefixedText()
2648                         );
2649                         return;
2650                 }
2651
2652                 # Hack for big sites
2653                 $bigHistory = $this->isBigDeletion();
2654                 if ( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2655                         global $wgLang, $wgDeleteRevisionsLimit;
2656                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2657                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2658                         return;
2659                 }
2660
2661                 if ( $confirm ) {
2662                         $this->doDelete( $reason, $suppress );
2663                         if ( $wgRequest->getCheck( 'wpWatch' ) && $wgUser->isLoggedIn() ) {
2664                                 $this->doWatch();
2665                         } elseif ( $this->mTitle->userIsWatching() ) {
2666                                 $this->doUnwatch();
2667                         }
2668                         return;
2669                 }
2670
2671                 // Generate deletion reason
2672                 $hasHistory = false;
2673                 if ( !$reason ) $reason = $this->generateReason( $hasHistory );
2674
2675                 // If the page has a history, insert a warning
2676                 if ( $hasHistory && !$confirm ) {
2677                         global $wgLang;
2678                         $skin = $wgUser->getSkin();
2679                         $revisions = $this->estimateRevisionCount();
2680                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
2681                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
2682                                 wfMsgHtml( 'word-separator' ) . $skin->historyLink() .
2683                                 '</strong>'
2684                         );
2685                         if ( $bigHistory ) {
2686                                 global $wgDeleteRevisionsLimit;
2687                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2688                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2689                         }
2690                 }
2691
2692                 return $this->confirmDelete( $reason );
2693         }
2694
2695         /**
2696          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2697          */
2698         public function isBigDeletion() {
2699                 global $wgDeleteRevisionsLimit;
2700                 if ( $wgDeleteRevisionsLimit ) {
2701                         $revCount = $this->estimateRevisionCount();
2702                         return $revCount > $wgDeleteRevisionsLimit;
2703                 }
2704                 return false;
2705         }
2706
2707         /**
2708          * @return int approximate revision count
2709          */
2710         public function estimateRevisionCount() {
2711                 $dbr = wfGetDB( DB_SLAVE );
2712                 // For an exact count...
2713                 // return $dbr->selectField( 'revision', 'COUNT(*)',
2714                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2715                 return $dbr->estimateRowCount( 'revision', '*',
2716                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2717         }
2718
2719         /**
2720          * Get the last N authors
2721          * @param $num Integer: number of revisions to get
2722          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2723          * @return array Array of authors, duplicates not removed
2724          */
2725         public function getLastNAuthors( $num, $revLatest = 0 ) {
2726                 wfProfileIn( __METHOD__ );
2727                 // First try the slave
2728                 // If that doesn't have the latest revision, try the master
2729                 $continue = 2;
2730                 $db = wfGetDB( DB_SLAVE );
2731                 do {
2732                         $res = $db->select( array( 'page', 'revision' ),
2733                                 array( 'rev_id', 'rev_user_text' ),
2734                                 array(
2735                                         'page_namespace' => $this->mTitle->getNamespace(),
2736                                         'page_title' => $this->mTitle->getDBkey(),
2737                                         'rev_page = page_id'
2738                                 ), __METHOD__, $this->getSelectOptions( array(
2739                                         'ORDER BY' => 'rev_timestamp DESC',
2740                                         'LIMIT' => $num
2741                                 ) )
2742                         );
2743                         if ( !$res ) {
2744                                 wfProfileOut( __METHOD__ );
2745                                 return array();
2746                         }
2747                         $row = $db->fetchObject( $res );
2748                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2749                                 $db = wfGetDB( DB_MASTER );
2750                                 $continue--;
2751                         } else {
2752                                 $continue = 0;
2753                         }
2754                 } while ( $continue );
2755
2756                 $authors = array( $row->rev_user_text );
2757                 while ( $row = $db->fetchObject( $res ) ) {
2758                         $authors[] = $row->rev_user_text;
2759                 }
2760                 wfProfileOut( __METHOD__ );
2761                 return $authors;
2762         }
2763
2764         /**
2765          * Output deletion confirmation dialog
2766          * @param $reason String: prefilled reason
2767          */
2768         public function confirmDelete( $reason ) {
2769                 global $wgOut, $wgUser;
2770
2771                 wfDebug( "Article::confirmDelete\n" );
2772
2773                 $deleteBackLink = $wgUser->getSkin()->link(
2774                         $this->mTitle,
2775                         null,
2776                         array(),
2777                         array(),
2778                         array( 'known', 'noclasses' )
2779                 );
2780                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
2781                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2782                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2783
2784                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
2785
2786                 if ( $wgUser->isAllowed( 'suppressrevision' ) ) {
2787                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2788                                         <td></td>
2789                                         <td class='mw-input'><strong>" .
2790                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2791                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2792                                         "</strong></td>
2793                                 </tr>";
2794                 } else {
2795                         $suppress = '';
2796                 }
2797                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2798
2799                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2800                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2801                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2802                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2803                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2804                         "<tr id=\"wpDeleteReasonListRow\">
2805                                 <td class='mw-label'>" .
2806                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2807                                 "</td>
2808                                 <td class='mw-input'>" .
2809                                         Xml::listDropDown( 'wpDeleteReasonList',
2810                                                 wfMsgForContent( 'deletereason-dropdown' ),
2811                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2812                                 "</td>
2813                         </tr>
2814                         <tr id=\"wpDeleteReasonRow\">
2815                                 <td class='mw-label'>" .
2816                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2817                                 "</td>
2818                                 <td class='mw-input'>" .
2819                                 Html::input( 'wpReason', $reason, 'text', array(
2820                                         'size' => '60',
2821                                         'maxlength' => '255',
2822                                         'tabindex' => '2',
2823                                         'id' => 'wpReason',
2824                                         'autofocus'
2825                                 ) ) .
2826                                 "</td>
2827                         </tr>";
2828                 # Dissalow watching is user is not logged in
2829                 if ( $wgUser->isLoggedIn() ) {
2830                         $form .= "
2831                         <tr>
2832                                 <td></td>
2833                                 <td class='mw-input'>" .
2834                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2835                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2836                                 "</td>
2837                         </tr>";
2838                 }
2839                 $form .= "
2840                         $suppress
2841                         <tr>
2842                                 <td></td>
2843                                 <td class='mw-submit'>" .
2844                                         Xml::submitButton( wfMsg( 'deletepage' ),
2845                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2846                                 "</td>
2847                         </tr>" .
2848                         Xml::closeElement( 'table' ) .
2849                         Xml::closeElement( 'fieldset' ) .
2850                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2851                         Xml::closeElement( 'form' );
2852
2853                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
2854                                 $skin = $wgUser->getSkin();
2855                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
2856                                 $link = $skin->link(
2857                                         $title,
2858                                         wfMsgHtml( 'delete-edit-reasonlist' ),
2859                                         array(),
2860                                         array( 'action' => 'edit' )
2861                                 );
2862                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2863                         }
2864
2865                 $wgOut->addHTML( $form );
2866                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2867                 LogEventsList::showLogExtract(
2868                         $wgOut,
2869                         'delete',
2870                         $this->mTitle->getPrefixedText()
2871                 );
2872         }
2873
2874         /**
2875          * Perform a deletion and output success or failure messages
2876          */
2877         public function doDelete( $reason, $suppress = false ) {
2878                 global $wgOut, $wgUser;
2879                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2880
2881                 $error = '';
2882                 if ( wfRunHooks( 'ArticleDelete', array( &$this, &$wgUser, &$reason, &$error ) ) ) {
2883                         if ( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2884                                 $deleted = $this->mTitle->getPrefixedText();
2885
2886                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2887                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2888
2889                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2890
2891                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2892                                 $wgOut->returnToMain( false );
2893                                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$wgUser, $reason, $id ) );
2894                         }
2895                 } else {
2896                         if ( $error == '' ) {
2897                                 $wgOut->showFatalError(
2898                                         Html::rawElement(
2899                                                 'div',
2900                                                 array( 'class' => 'error mw-error-cannotdelete' ),
2901                                                 wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2902                                         )
2903                                 );
2904                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2905                                 LogEventsList::showLogExtract(
2906                                         $wgOut,
2907                                         'delete',
2908                                         $this->mTitle->getPrefixedText()
2909                                 );
2910                         } else {
2911                                 $wgOut->showFatalError( $error );
2912                         }
2913                 }
2914         }
2915
2916         /**
2917          * Back-end article deletion
2918          * Deletes the article with database consistency, writes logs, purges caches
2919          *
2920          * @param $reason string delete reason for deletion log
2921          * @param suppress bitfield
2922          *      Revision::DELETED_TEXT
2923          *      Revision::DELETED_COMMENT
2924          *      Revision::DELETED_USER
2925          *      Revision::DELETED_RESTRICTED
2926          * @param $id int article ID
2927          * @param $commit boolean defaults to true, triggers transaction end
2928          * @return boolean true if successful
2929          */
2930         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true ) {
2931                 global $wgUseSquid, $wgDeferredUpdateList;
2932                 global $wgUseTrackbacks;
2933
2934                 wfDebug( __METHOD__ . "\n" );
2935
2936                 $dbw = wfGetDB( DB_MASTER );
2937                 $ns = $this->mTitle->getNamespace();
2938                 $t = $this->mTitle->getDBkey();
2939                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2940
2941                 if ( $t == '' || $id == 0 ) {
2942                         return false;
2943                 }
2944
2945                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable( $this->getRawText() ), -1 );
2946                 array_push( $wgDeferredUpdateList, $u );
2947
2948                 // Bitfields to further suppress the content
2949                 if ( $suppress ) {
2950                         $bitfield = 0;
2951                         // This should be 15...
2952                         $bitfield |= Revision::DELETED_TEXT;
2953                         $bitfield |= Revision::DELETED_COMMENT;
2954                         $bitfield |= Revision::DELETED_USER;
2955                         $bitfield |= Revision::DELETED_RESTRICTED;
2956                 } else {
2957                         $bitfield = 'rev_deleted';
2958                 }
2959
2960                 $dbw->begin();
2961                 // For now, shunt the revision data into the archive table.
2962                 // Text is *not* removed from the text table; bulk storage
2963                 // is left intact to avoid breaking block-compression or
2964                 // immutable storage schemes.
2965                 //
2966                 // For backwards compatibility, note that some older archive
2967                 // table entries will have ar_text and ar_flags fields still.
2968                 //
2969                 // In the future, we may keep revisions and mark them with
2970                 // the rev_deleted field, which is reserved for this purpose.
2971                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2972                         array(
2973                                 'ar_namespace'  => 'page_namespace',
2974                                 'ar_title'      => 'page_title',
2975                                 'ar_comment'    => 'rev_comment',
2976                                 'ar_user'       => 'rev_user',
2977                                 'ar_user_text'  => 'rev_user_text',
2978                                 'ar_timestamp'  => 'rev_timestamp',
2979                                 'ar_minor_edit' => 'rev_minor_edit',
2980                                 'ar_rev_id'     => 'rev_id',
2981                                 'ar_text_id'    => 'rev_text_id',
2982                                 'ar_text'       => '\'\'', // Be explicit to appease
2983                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2984                                 'ar_len'        => 'rev_len',
2985                                 'ar_page_id'    => 'page_id',
2986                                 'ar_deleted'    => $bitfield
2987                         ), array(
2988                                 'page_id' => $id,
2989                                 'page_id = rev_page'
2990                         ), __METHOD__
2991                 );
2992
2993                 # Delete restrictions for it
2994                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2995
2996                 # Now that it's safely backed up, delete it
2997                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2998                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2999                 if ( !$ok ) {
3000                         $dbw->rollback();
3001                         return false;
3002                 }
3003
3004                 # Fix category table counts
3005                 $cats = array();
3006                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
3007                 foreach ( $res as $row ) {
3008                         $cats [] = $row->cl_to;
3009                 }
3010                 $this->updateCategoryCounts( array(), $cats );
3011
3012                 # If using cascading deletes, we can skip some explicit deletes
3013                 if ( !$dbw->cascadingDeletes() ) {
3014                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
3015
3016                         if ( $wgUseTrackbacks )
3017                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
3018
3019                         # Delete outgoing links
3020                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
3021                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
3022                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
3023                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
3024                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
3025                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
3026                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
3027                 }
3028
3029                 # If using cleanup triggers, we can skip some manual deletes
3030                 if ( !$dbw->cleanupTriggers() ) {
3031                         # Clean up recentchanges entries...
3032                         $dbw->delete( 'recentchanges',
3033                                 array( 'rc_type != ' . RC_LOG,
3034                                         'rc_namespace' => $this->mTitle->getNamespace(),
3035                                         'rc_title' => $this->mTitle->getDBkey() ),
3036                                 __METHOD__ );
3037                         $dbw->delete( 'recentchanges',
3038                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
3039                                 __METHOD__ );
3040                 }
3041
3042                 # Clear caches
3043                 Article::onArticleDelete( $this->mTitle );
3044
3045                 # Clear the cached article id so the interface doesn't act like we exist
3046                 $this->mTitle->resetArticleID( 0 );
3047
3048                 # Log the deletion, if the page was suppressed, log it at Oversight instead
3049                 $logtype = $suppress ? 'suppress' : 'delete';
3050                 $log = new LogPage( $logtype );
3051
3052                 # Make sure logging got through
3053                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
3054
3055                 if ( $commit ) {
3056                         $dbw->commit();
3057                 }
3058
3059                 return true;
3060         }
3061
3062         /**
3063          * Roll back the most recent consecutive set of edits to a page
3064          * from the same user; fails if there are no eligible edits to
3065          * roll back to, e.g. user is the sole contributor. This function
3066          * performs permissions checks on $wgUser, then calls commitRollback()
3067          * to do the dirty work
3068          *
3069          * @param $fromP String: Name of the user whose edits to rollback.
3070          * @param $summary String: Custom summary. Set to default summary if empty.
3071          * @param $token String: Rollback token.
3072          * @param $bot Boolean: If true, mark all reverted edits as bot.
3073          *
3074          * @param $resultDetails Array: contains result-specific array of additional values
3075          *    'alreadyrolled' : 'current' (rev)
3076          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3077          *
3078          * @return array of errors, each error formatted as
3079          *   array(messagekey, param1, param2, ...).
3080          * On success, the array is empty.  This array can also be passed to
3081          * OutputPage::showPermissionsErrorPage().
3082          */
3083         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
3084                 global $wgUser;
3085                 $resultDetails = null;
3086
3087                 # Check permissions
3088                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
3089                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
3090                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3091
3092                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
3093                         $errors[] = array( 'sessionfailure' );
3094
3095                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
3096                         $errors[] = array( 'actionthrottledtext' );
3097                 }
3098                 # If there were errors, bail out now
3099                 if ( !empty( $errors ) )
3100                         return $errors;
3101
3102                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
3103         }
3104
3105         /**
3106          * Backend implementation of doRollback(), please refer there for parameter
3107          * and return value documentation
3108          *
3109          * NOTE: This function does NOT check ANY permissions, it just commits the
3110          * rollback to the DB Therefore, you should only call this function direct-
3111          * ly if you want to use custom permissions checks. If you don't, use
3112          * doRollback() instead.
3113          */
3114         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
3115                 global $wgUseRCPatrol, $wgUser, $wgLang;
3116                 $dbw = wfGetDB( DB_MASTER );
3117
3118                 if ( wfReadOnly() ) {
3119                         return array( array( 'readonlytext' ) );
3120                 }
3121
3122                 # Get the last editor
3123                 $current = Revision::newFromTitle( $this->mTitle );
3124                 if ( is_null( $current ) ) {
3125                         # Something wrong... no page?
3126                         return array( array( 'notanarticle' ) );
3127                 }
3128
3129                 $from = str_replace( '_', ' ', $fromP );
3130                 # User name given should match up with the top revision.
3131                 # If the user was deleted then $from should be empty.
3132                 if ( $from != $current->getUserText() ) {
3133                         $resultDetails = array( 'current' => $current );
3134                         return array( array( 'alreadyrolled',
3135                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3136                                 htmlspecialchars( $fromP ),
3137                                 htmlspecialchars( $current->getUserText() )
3138                         ) );
3139                 }
3140
3141                 # Get the last edit not by this guy...
3142                 # Note: these may not be public values
3143                 $user = intval( $current->getRawUser() );
3144                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3145                 $s = $dbw->selectRow( 'revision',
3146                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3147                         array( 'rev_page' => $current->getPage(),
3148                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3149                         ), __METHOD__,
3150                         array( 'USE INDEX' => 'page_timestamp',
3151                                 'ORDER BY'  => 'rev_timestamp DESC' )
3152                         );
3153                 if ( $s === false ) {
3154                         # No one else ever edited this page
3155                         return array( array( 'cantrollback' ) );
3156                 } else if ( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
3157                         # Only admins can see this text
3158                         return array( array( 'notvisiblerev' ) );
3159                 }
3160
3161                 $set = array();
3162                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
3163                         # Mark all reverted edits as bot
3164                         $set['rc_bot'] = 1;
3165                 }
3166                 if ( $wgUseRCPatrol ) {
3167                         # Mark all reverted edits as patrolled
3168                         $set['rc_patrolled'] = 1;
3169                 }
3170
3171                 if ( count( $set ) ) {
3172                         $dbw->update( 'recentchanges', $set,
3173                                 array( /* WHERE */
3174                                         'rc_cur_id' => $current->getPage(),
3175                                         'rc_user_text' => $current->getUserText(),
3176                                         "rc_timestamp > '{$s->rev_timestamp}'",
3177                                 ), __METHOD__
3178                         );
3179                 }
3180
3181                 # Generate the edit summary if necessary
3182                 $target = Revision::newFromId( $s->rev_id );
3183                 if ( empty( $summary ) ) {
3184                         if ( $from == '' ) { // no public user name
3185                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3186                         } else {
3187                                 $summary = wfMsgForContent( 'revertpage' );
3188                         }
3189                 }
3190
3191                 # Allow the custom summary to use the same args as the default message
3192                 $args = array(
3193                         $target->getUserText(), $from, $s->rev_id,
3194                         $wgLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ), true ),
3195                         $current->getId(), $wgLang->timeanddate( $current->getTimestamp() )
3196                 );
3197                 $summary = wfMsgReplaceArgs( $summary, $args );
3198
3199                 # Save
3200                 $flags = EDIT_UPDATE;
3201
3202                 if ( $wgUser->isAllowed( 'minoredit' ) )
3203                         $flags |= EDIT_MINOR;
3204
3205                 if ( $bot && ( $wgUser->isAllowed( 'markbotedits' ) || $wgUser->isAllowed( 'bot' ) ) )
3206                         $flags |= EDIT_FORCE_BOT;
3207                 # Actually store the edit
3208                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3209                 if ( !empty( $status->value['revision'] ) ) {
3210                         $revId = $status->value['revision']->getId();
3211                 } else {
3212                         $revId = false;
3213                 }
3214
3215                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3216
3217                 $resultDetails = array(
3218                         'summary' => $summary,
3219                         'current' => $current,
3220                         'target'  => $target,
3221                         'newid'   => $revId
3222                 );
3223                 return array();
3224         }
3225
3226         /**
3227          * User interface for rollback operations
3228          */
3229         public function rollback() {
3230                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
3231                 $details = null;
3232
3233                 $result = $this->doRollback(
3234                         $wgRequest->getVal( 'from' ),
3235                         $wgRequest->getText( 'summary' ),
3236                         $wgRequest->getVal( 'token' ),
3237                         $wgRequest->getBool( 'bot' ),
3238                         $details
3239                 );
3240
3241                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
3242                         $wgOut->rateLimited();
3243                         return;
3244                 }
3245                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3246                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3247                         $errArray = $result[0];
3248                         $errMsg = array_shift( $errArray );
3249                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3250                         if ( isset( $details['current'] ) ) {
3251                                 $current = $details['current'];
3252                                 if ( $current->getComment() != '' ) {
3253                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3254                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3255                                 }
3256                         }
3257                         return;
3258                 }
3259                 # Display permissions errors before read-only message -- there's no
3260                 # point in misleading the user into thinking the inability to rollback
3261                 # is only temporary.
3262                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3263                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
3264                         # move any 'readonlytext' error manually.
3265                         $out = array();
3266                         foreach ( $result as $error ) {
3267                                 if ( $error != array( 'readonlytext' ) ) {
3268                                         $out [] = $error;
3269                                 }
3270                         }
3271                         $wgOut->showPermissionsErrorPage( $out );
3272                         return;
3273                 }
3274                 if ( $result == array( array( 'readonlytext' ) ) ) {
3275                         $wgOut->readOnlyPage();
3276                         return;
3277                 }
3278
3279                 $current = $details['current'];
3280                 $target = $details['target'];
3281                 $newId = $details['newid'];
3282                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3283                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3284                 if ( $current->getUserText() === '' ) {
3285                         $old = wfMsg( 'rev-deleted-user' );
3286                 } else {
3287                         $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
3288                                 . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
3289                 }
3290                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
3291                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
3292                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3293                 $wgOut->returnToMain( false, $this->mTitle );
3294
3295                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3296                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3297                         $de->showDiff( '', '' );
3298                 }
3299         }
3300
3301
3302         /**
3303          * Do standard deferred updates after page view
3304          */
3305         public function viewUpdates() {
3306                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3307                 if ( wfReadOnly() ) {
3308                         return;
3309                 }
3310                 # Don't update page view counters on views from bot users (bug 14044)
3311                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
3312                         Article::incViewCount( $this->getID() );
3313                         $u = new SiteStatsUpdate( 1, 0, 0 );
3314                         array_push( $wgDeferredUpdateList, $u );
3315                 }
3316                 # Update newtalk / watchlist notification status
3317                 $wgUser->clearNotification( $this->mTitle );
3318         }
3319
3320         /**
3321          * Prepare text which is about to be saved.
3322          * Returns a stdclass with source, pst and output members
3323          */
3324         public function prepareTextForEdit( $text, $revid = null ) {
3325                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3326                         // Already prepared
3327                         return $this->mPreparedEdit;
3328                 }
3329                 global $wgParser;
3330                 $edit = (object)array();
3331                 $edit->revid = $revid;
3332                 $edit->newText = $text;
3333                 $edit->pst = $this->preSaveTransform( $text );
3334                 $options = $this->getParserOptions();
3335                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
3336                 $edit->oldText = $this->getContent();
3337                 $this->mPreparedEdit = $edit;
3338                 return $edit;
3339         }
3340
3341         /**
3342          * Do standard deferred updates after page edit.
3343          * Update links tables, site stats, search index and message cache.
3344          * Purges pages that include this page if the text was changed here.
3345          * Every 100th edit, prune the recent changes table.
3346          *
3347          * @private
3348          * @param $text New text of the article
3349          * @param $summary Edit summary
3350          * @param $minoredit Minor edit
3351          * @param $timestamp_of_pagechange Timestamp associated with the page change
3352          * @param $newid rev_id value of the new revision
3353          * @param $changed Whether or not the content actually changed
3354          */
3355         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
3356                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgEnableParserCache;
3357
3358                 wfProfileIn( __METHOD__ );
3359
3360                 # Parse the text
3361                 # Be careful not to double-PST: $text is usually already PST-ed once
3362                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3363                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3364                         $editInfo = $this->prepareTextForEdit( $text, $newid );
3365                 } else {
3366                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3367                         $editInfo = $this->mPreparedEdit;
3368                 }
3369
3370                 # Save it to the parser cache
3371                 if ( $wgEnableParserCache ) {
3372                         $popts = $this->getParserOptions();
3373                         $parserCache = ParserCache::singleton();
3374                         $parserCache->save( $editInfo->output, $this, $popts );
3375                 }
3376
3377                 # Update the links tables
3378                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3379                 $u->doUpdate();
3380
3381                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3382
3383                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3384                         if ( 0 == mt_rand( 0, 99 ) ) {
3385                                 // Flush old entries from the `recentchanges` table; we do this on
3386                                 // random requests so as to avoid an increase in writes for no good reason
3387                                 global $wgRCMaxAge;
3388                                 $dbw = wfGetDB( DB_MASTER );
3389                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3390                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3391                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3392                                 $dbw->query( $sql );
3393                         }
3394                 }
3395
3396                 $id = $this->getID();
3397                 $title = $this->mTitle->getPrefixedDBkey();
3398                 $shortTitle = $this->mTitle->getDBkey();
3399
3400                 if ( 0 == $id ) {
3401                         wfProfileOut( __METHOD__ );
3402                         return;
3403                 }
3404
3405                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3406                 array_push( $wgDeferredUpdateList, $u );
3407                 $u = new SearchUpdate( $id, $title, $text );
3408                 array_push( $wgDeferredUpdateList, $u );
3409
3410                 # If this is another user's talk page, update newtalk
3411                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3412                 # load of user talk pages and piss people off, nor if it's a minor edit
3413                 # by a properly-flagged bot.
3414                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3415                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
3416                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3417                                 $other = User::newFromName( $shortTitle, false );
3418                                 if ( !$other ) {
3419                                         wfDebug( __METHOD__ . ": invalid username\n" );
3420                                 } elseif ( User::isIP( $shortTitle ) ) {
3421                                         // An anonymous user
3422                                         $other->setNewtalk( true );
3423                                 } elseif ( $other->isLoggedIn() ) {
3424                                         $other->setNewtalk( true );
3425                                 } else {
3426                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3427                                 }
3428                         }
3429                 }
3430
3431                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3432                         $wgMessageCache->replace( $shortTitle, $text );
3433                 }
3434
3435                 wfProfileOut( __METHOD__ );
3436         }
3437
3438         /**
3439          * Perform article updates on a special page creation.
3440          *
3441          * @param $rev Revision object
3442          *
3443          * @todo This is a shitty interface function. Kill it and replace the
3444          * other shitty functions like editUpdates and such so it's not needed
3445          * anymore.
3446          */
3447         public function createUpdates( $rev ) {
3448                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3449                 $this->mTotalAdjustment = 1;
3450                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3451                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3452         }
3453
3454         /**
3455          * Generate the navigation links when browsing through an article revisions
3456          * It shows the information as:
3457          *   Revision as of \<date\>; view current revision
3458          *   \<- Previous version | Next Version -\>
3459          *
3460          * @param $oldid String: revision ID of this article revision
3461          */
3462         public function setOldSubtitle( $oldid = 0 ) {
3463                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3464
3465                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3466                         return;
3467                 }
3468
3469                 $unhide = $wgRequest->getInt( 'unhide' ) == 1 &&
3470                         $wgUser->matchEditToken( $wgRequest->getVal( 'token' ), $oldid );
3471                 # Cascade unhide param in links for easy deletion browsing
3472                 $extraParams = array();
3473                 if ( $wgRequest->getVal( 'unhide' ) ) {
3474                         $extraParams['unhide'] = 1;
3475                 }
3476                 $revision = Revision::newFromId( $oldid );
3477
3478                 $current = ( $oldid == $this->mLatest );
3479                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3480                 $tddate = $wgLang->date( $this->mTimestamp, true );
3481                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3482                 $sk = $wgUser->getSkin();
3483                 $lnk = $current
3484                         ? wfMsgHtml( 'currentrevisionlink' )
3485                         : $sk->link(
3486                                 $this->mTitle,
3487                                 wfMsgHtml( 'currentrevisionlink' ),
3488                                 array(),
3489                                 $extraParams,
3490                                 array( 'known', 'noclasses' )
3491                         );
3492                 $curdiff = $current
3493                         ? wfMsgHtml( 'diff' )
3494                         : $sk->link(
3495                                 $this->mTitle,
3496                                 wfMsgHtml( 'diff' ),
3497                                 array(),
3498                                 array(
3499                                         'diff' => 'cur',
3500                                         'oldid' => $oldid
3501                                 ) + $extraParams,
3502                                 array( 'known', 'noclasses' )
3503                         );
3504                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3505                 $prevlink = $prev
3506                         ? $sk->link(
3507                                 $this->mTitle,
3508                                 wfMsgHtml( 'previousrevision' ),
3509                                 array(),
3510                                 array(
3511                                         'direction' => 'prev',
3512                                         'oldid' => $oldid
3513                                 ) + $extraParams,
3514                                 array( 'known', 'noclasses' )
3515                         )
3516                         : wfMsgHtml( 'previousrevision' );
3517                 $prevdiff = $prev
3518                         ? $sk->link(
3519                                 $this->mTitle,
3520                                 wfMsgHtml( 'diff' ),
3521                                 array(),
3522                                 array(
3523                                         'diff' => 'prev',
3524                                         'oldid' => $oldid
3525                                 ) + $extraParams,
3526                                 array( 'known', 'noclasses' )
3527                         )
3528                         : wfMsgHtml( 'diff' );
3529                 $nextlink = $current
3530                         ? wfMsgHtml( 'nextrevision' )
3531                         : $sk->link(
3532                                 $this->mTitle,
3533                                 wfMsgHtml( 'nextrevision' ),
3534                                 array(),
3535                                 array(
3536                                         'direction' => 'next',
3537                                         'oldid' => $oldid
3538                                 ) + $extraParams,
3539                                 array( 'known', 'noclasses' )
3540                         );
3541                 $nextdiff = $current
3542                         ? wfMsgHtml( 'diff' )
3543                         : $sk->link(
3544                                 $this->mTitle,
3545                                 wfMsgHtml( 'diff' ),
3546                                 array(),
3547                                 array(
3548                                         'diff' => 'next',
3549                                         'oldid' => $oldid
3550                                 ) + $extraParams,
3551                                 array( 'known', 'noclasses' )
3552                         );
3553
3554                 $cdel = '';
3555                 // User can delete revisions or view deleted revisions...
3556                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3557                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3558                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3559                                 $cdel = $sk->revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3560                         } else {
3561                                 $query = array(
3562                                         'type'   => 'revision',
3563                                         'target' => $this->mTitle->getPrefixedDbkey(),
3564                                         'ids'    => $oldid
3565                                 );
3566                                 $cdel = $sk->revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3567                         }
3568                         $cdel .= ' ';
3569                 }
3570
3571                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3572                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3573
3574                 $m = wfMsg( 'revision-info-current' );
3575                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3576                         ? 'revision-info-current'
3577                         : 'revision-info';
3578
3579                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3580                         wfMsgExt(
3581                                 $infomsg,
3582                                 array( 'parseinline', 'replaceafter' ),
3583                                 $td,
3584                                 $userlinks,
3585                                 $revision->getID(),
3586                                 $tddate,
3587                                 $tdtime,
3588                                 $revision->getUser()
3589                         ) .
3590                         "</div>\n" .
3591                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3592                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3593                 $wgOut->setSubtitle( $r );
3594         }
3595
3596         /**
3597          * This function is called right before saving the wikitext,
3598          * so we can do things like signatures and links-in-context.
3599          *
3600          * @param $text String article contents
3601          * @return string article contents with altered wikitext markup (signatures
3602          *      converted, {{subst:}}, templates, etc.)
3603          */
3604         public function preSaveTransform( $text ) {
3605                 global $wgParser, $wgUser;
3606                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3607         }
3608
3609         /* Caching functions */
3610
3611         /**
3612          * checkLastModified returns true if it has taken care of all
3613          * output to the client that is necessary for this request.
3614          * (that is, it has sent a cached version of the page)
3615          *
3616          * @return boolean true if cached version send, false otherwise
3617          */
3618         protected function tryFileCache() {
3619                 static $called = false;
3620                 if ( $called ) {
3621                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3622                         return false;
3623                 }
3624                 $called = true;
3625                 if ( $this->isFileCacheable() ) {
3626                         $cache = new HTMLFileCache( $this->mTitle );
3627                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3628                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3629                                 $cache->loadFromFileCache();
3630                                 return true;
3631                         } else {
3632                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3633                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3634                         }
3635                 } else {
3636                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3637                 }
3638                 return false;
3639         }
3640
3641         /**
3642          * Check if the page can be cached
3643          * @return bool
3644          */
3645         public function isFileCacheable() {
3646                 $cacheable = false;
3647                 if ( HTMLFileCache::useFileCache() ) {
3648                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3649                         // Extension may have reason to disable file caching on some pages.
3650                         if ( $cacheable ) {
3651                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3652                         }
3653                 }
3654                 return $cacheable;
3655         }
3656
3657         /**
3658          * Loads page_touched and returns a value indicating if it should be used
3659          * @return boolean true if not a redirect
3660          */
3661         public function checkTouched() {
3662                 if ( !$this->mDataLoaded ) {
3663                         $this->loadPageData();
3664                 }
3665                 return !$this->mIsRedirect;
3666         }
3667
3668         /**
3669          * Get the page_touched field
3670          * @return string containing GMT timestamp
3671          */
3672         public function getTouched() {
3673                 # Ensure that page data has been loaded
3674                 if ( !$this->mDataLoaded ) {
3675                         $this->loadPageData();
3676                 }
3677                 return $this->mTouched;
3678         }
3679
3680         /**
3681          * Get the page_latest field
3682          * @return integer rev_id of current revision
3683          */
3684         public function getLatest() {
3685                 if ( !$this->mDataLoaded ) {
3686                         $this->loadPageData();
3687                 }
3688                 return (int)$this->mLatest;
3689         }
3690
3691         /**
3692          * Edit an article without doing all that other stuff
3693          * The article must already exist; link tables etc
3694          * are not updated, caches are not flushed.
3695          *
3696          * @param $text String: text submitted
3697          * @param $comment String: comment submitted
3698          * @param $minor Boolean: whereas it's a minor modification
3699          */
3700         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3701                 wfProfileIn( __METHOD__ );
3702
3703                 $dbw = wfGetDB( DB_MASTER );
3704                 $revision = new Revision( array(
3705                         'page'       => $this->getId(),
3706                         'text'       => $text,
3707                         'comment'    => $comment,
3708                         'minor_edit' => $minor ? 1 : 0,
3709                         ) );
3710                 $revision->insertOn( $dbw );
3711                 $this->updateRevisionOn( $dbw, $revision );
3712
3713                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
3714
3715                 wfProfileOut( __METHOD__ );
3716         }
3717
3718         /**
3719          * Used to increment the view counter
3720          *
3721          * @param $id Integer: article id
3722          */
3723         public static function incViewCount( $id ) {
3724                 $id = intval( $id );
3725                 global $wgHitcounterUpdateFreq;
3726
3727                 $dbw = wfGetDB( DB_MASTER );
3728                 $pageTable = $dbw->tableName( 'page' );
3729                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3730                 $acchitsTable = $dbw->tableName( 'acchits' );
3731
3732                 if ( $wgHitcounterUpdateFreq <= 1 ) {
3733                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3734                         return;
3735                 }
3736
3737                 # Not important enough to warrant an error page in case of failure
3738                 $oldignore = $dbw->ignoreErrors( true );
3739
3740                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3741
3742                 $checkfreq = intval( $wgHitcounterUpdateFreq / 25 + 1 );
3743                 if ( ( rand() % $checkfreq != 0 ) or ( $dbw->lastErrno() != 0 ) ) {
3744                         # Most of the time (or on SQL errors), skip row count check
3745                         $dbw->ignoreErrors( $oldignore );
3746                         return;
3747                 }
3748
3749                 $res = $dbw->query( "SELECT COUNT(*) as n FROM $hitcounterTable" );
3750                 $row = $dbw->fetchObject( $res );
3751                 $rown = intval( $row->n );
3752                 if ( $rown >= $wgHitcounterUpdateFreq ) {
3753                         wfProfileIn( 'Article::incViewCount-collect' );
3754                         $old_user_abort = ignore_user_abort( true );
3755
3756                         $dbType = $dbw->getType();
3757                         $dbw->lockTables( array(), array( 'hitcounter' ), __METHOD__, false );
3758                         $tabletype = $dbType == 'mysql' ? "ENGINE=HEAP " : '';
3759                         $dbw->query( "CREATE TEMPORARY TABLE $acchitsTable $tabletype AS " .
3760                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable " .
3761                                 'GROUP BY hc_id', __METHOD__ );
3762                         $dbw->delete( 'hitcounter', '*', __METHOD__ );
3763                         $dbw->unlockTables( __METHOD__ );
3764                         if ( $dbType == 'mysql' ) {
3765                                 $dbw->query( "UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n " .
3766                                         'WHERE page_id = hc_id', __METHOD__ );
3767                         }
3768                         else {
3769                                 $dbw->query( "UPDATE $pageTable SET page_counter=page_counter + hc_n " .
3770                                         "FROM $acchitsTable WHERE page_id = hc_id", __METHOD__ );
3771                         }
3772                         $dbw->query( "DROP TABLE $acchitsTable", __METHOD__ );
3773
3774                         ignore_user_abort( $old_user_abort );
3775                         wfProfileOut( 'Article::incViewCount-collect' );
3776                 }
3777                 $dbw->ignoreErrors( $oldignore );
3778         }
3779
3780         /**#@+
3781          * The onArticle*() functions are supposed to be a kind of hooks
3782          * which should be called whenever any of the specified actions
3783          * are done.
3784          *
3785          * This is a good place to put code to clear caches, for instance.
3786          *
3787          * This is called on page move and undelete, as well as edit
3788          *
3789          * @param $title a title object
3790          */
3791         public static function onArticleCreate( $title ) {
3792                 # Update existence markers on article/talk tabs...
3793                 if ( $title->isTalkPage() ) {
3794                         $other = $title->getSubjectPage();
3795                 } else {
3796                         $other = $title->getTalkPage();
3797                 }
3798                 $other->invalidateCache();
3799                 $other->purgeSquid();
3800
3801                 $title->touchLinks();
3802                 $title->purgeSquid();
3803                 $title->deleteTitleProtection();
3804         }
3805
3806         /**
3807          * Clears caches when article is deleted
3808          */
3809         public static function onArticleDelete( $title ) {
3810                 global $wgMessageCache;
3811                 # Update existence markers on article/talk tabs...
3812                 if ( $title->isTalkPage() ) {
3813                         $other = $title->getSubjectPage();
3814                 } else {
3815                         $other = $title->getTalkPage();
3816                 }
3817                 $other->invalidateCache();
3818                 $other->purgeSquid();
3819
3820                 $title->touchLinks();
3821                 $title->purgeSquid();
3822
3823                 # File cache
3824                 HTMLFileCache::clearFileCache( $title );
3825
3826                 # Messages
3827                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3828                         $wgMessageCache->replace( $title->getDBkey(), false );
3829                 }
3830                 # Images
3831                 if ( $title->getNamespace() == NS_FILE ) {
3832                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3833                         $update->doUpdate();
3834                 }
3835                 # User talk pages
3836                 if ( $title->getNamespace() == NS_USER_TALK ) {
3837                         $user = User::newFromName( $title->getText(), false );
3838                         $user->setNewtalk( false );
3839                 }
3840                 # Image redirects
3841                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3842         }
3843
3844         /**
3845          * Purge caches on page update etc
3846          *
3847          * @param $title Title object
3848          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
3849          */
3850         public static function onArticleEdit( $title ) {
3851                 global $wgDeferredUpdateList;
3852
3853                 // Invalidate caches of articles which include this page
3854                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3855
3856                 // Invalidate the caches of all pages which redirect here
3857                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3858
3859                 # Purge squid for this page only
3860                 $title->purgeSquid();
3861
3862                 # Clear file cache for this page only
3863                 HTMLFileCache::clearFileCache( $title );
3864         }
3865
3866         /**#@-*/
3867
3868         /**
3869          * Overriden by ImagePage class, only present here to avoid a fatal error
3870          * Called for ?action=revert
3871          */
3872         public function revert() {
3873                 global $wgOut;
3874                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3875         }
3876
3877         /**
3878          * Info about this page
3879          * Called for ?action=info when $wgAllowPageInfo is on.
3880          */
3881         public function info() {
3882                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3883
3884                 if ( !$wgAllowPageInfo ) {
3885                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3886                         return;
3887                 }
3888
3889                 $page = $this->mTitle->getSubjectPage();
3890
3891                 $wgOut->setPagetitle( $page->getPrefixedText() );
3892                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3893                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3894
3895                 if ( !$this->mTitle->exists() ) {
3896                         $wgOut->addHTML( '<div class="noarticletext">' );
3897                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3898                                 // This doesn't quite make sense; the user is asking for
3899                                 // information about the _page_, not the message... -- RC
3900                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3901                         } else {
3902                                 $msg = $wgUser->isLoggedIn()
3903                                         ? 'noarticletext'
3904                                         : 'noarticletextanon';
3905                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3906                         }
3907                         $wgOut->addHTML( '</div>' );
3908                 } else {
3909                         $dbr = wfGetDB( DB_SLAVE );
3910                         $wl_clause = array(
3911                                 'wl_title'     => $page->getDBkey(),
3912                                 'wl_namespace' => $page->getNamespace() );
3913                         $numwatchers = $dbr->selectField(
3914                                 'watchlist',
3915                                 'COUNT(*)',
3916                                 $wl_clause,
3917                                 __METHOD__,
3918                                 $this->getSelectOptions() );
3919
3920                         $pageInfo = $this->pageCountInfo( $page );
3921                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3922
3923                         $wgOut->addHTML( "<ul><li>" . wfMsg( "numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3924                         $wgOut->addHTML( "<li>" . wfMsg( 'numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>' );
3925                         if ( $talkInfo ) {
3926                                 $wgOut->addHTML( '<li>' . wfMsg( "numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>' );
3927                         }
3928                         $wgOut->addHTML( '<li>' . wfMsg( "numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3929                         if ( $talkInfo ) {
3930                                 $wgOut->addHTML( '<li>' . wfMsg( 'numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3931                         }
3932                         $wgOut->addHTML( '</ul>' );
3933                 }
3934         }
3935
3936         /**
3937          * Return the total number of edits and number of unique editors
3938          * on a given page. If page does not exist, returns false.
3939          *
3940          * @param $title Title object
3941          * @return mixed array or boolean false
3942          */
3943         public function pageCountInfo( $title ) {
3944                 $id = $title->getArticleId();
3945                 if ( $id == 0 ) {
3946                         return false;
3947                 }
3948                 $dbr = wfGetDB( DB_SLAVE );
3949                 $rev_clause = array( 'rev_page' => $id );
3950                 $edits = $dbr->selectField(
3951                         'revision',
3952                         'COUNT(rev_page)',
3953                         $rev_clause,
3954                         __METHOD__,
3955                         $this->getSelectOptions()
3956                 );
3957                 $authors = $dbr->selectField(
3958                         'revision',
3959                         'COUNT(DISTINCT rev_user_text)',
3960                         $rev_clause,
3961                         __METHOD__,
3962                         $this->getSelectOptions()
3963                 );
3964                 return array( 'edits' => $edits, 'authors' => $authors );
3965         }
3966
3967         /**
3968          * Return a list of templates used by this article.
3969          * Uses the templatelinks table
3970          *
3971          * @return Array of Title objects
3972          */
3973         public function getUsedTemplates() {
3974                 $result = array();
3975                 $id = $this->mTitle->getArticleID();
3976                 if ( $id == 0 ) {
3977                         return array();
3978                 }
3979                 $dbr = wfGetDB( DB_SLAVE );
3980                 $res = $dbr->select( array( 'templatelinks' ),
3981                         array( 'tl_namespace', 'tl_title' ),
3982                         array( 'tl_from' => $id ),
3983                         __METHOD__ );
3984                 if ( $res !== false ) {
3985                         foreach ( $res as $row ) {
3986                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3987                         }
3988                 }
3989                 $dbr->freeResult( $res );
3990                 return $result;
3991         }
3992
3993         /**
3994          * Returns a list of hidden categories this page is a member of.
3995          * Uses the page_props and categorylinks tables.
3996          *
3997          * @return Array of Title objects
3998          */
3999         public function getHiddenCategories() {
4000                 $result = array();
4001                 $id = $this->mTitle->getArticleID();
4002                 if ( $id == 0 ) {
4003                         return array();
4004                 }
4005                 $dbr = wfGetDB( DB_SLAVE );
4006                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
4007                         array( 'cl_to' ),
4008                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
4009                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
4010                         __METHOD__ );
4011                 if ( $res !== false ) {
4012                         foreach ( $res as $row ) {
4013                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
4014                         }
4015                 }
4016                 $dbr->freeResult( $res );
4017                 return $result;
4018         }
4019
4020         /**
4021         * Return an applicable autosummary if one exists for the given edit.
4022         * @param $oldtext String: the previous text of the page.
4023         * @param $newtext String: The submitted text of the page.
4024         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
4025         * @return string An appropriate autosummary, or an empty string.
4026         */
4027         public static function getAutosummary( $oldtext, $newtext, $flags ) {
4028                 # Decide what kind of autosummary is needed.
4029
4030                 # Redirect autosummaries
4031                 $ot = Title::newFromRedirect( $oldtext );
4032                 $rt = Title::newFromRedirect( $newtext );
4033                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
4034                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
4035                 }
4036
4037                 # New page autosummaries
4038                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
4039                         # If they're making a new article, give its text, truncated, in the summary.
4040                         global $wgContLang;
4041                         $truncatedtext = $wgContLang->truncate(
4042                                 str_replace( "\n", ' ', $newtext ),
4043                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
4044                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
4045                 }
4046
4047                 # Blanking autosummaries
4048                 if ( $oldtext != '' && $newtext == '' ) {
4049                         return wfMsgForContent( 'autosumm-blank' );
4050                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
4051                         # Removing more than 90% of the article
4052                         global $wgContLang;
4053                         $truncatedtext = $wgContLang->truncate(
4054                                 $newtext,
4055                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
4056                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
4057                 }
4058
4059                 # If we reach this point, there's no applicable autosummary for our case, so our
4060                 # autosummary is empty.
4061                 return '';
4062         }
4063
4064         /**
4065          * Add the primary page-view wikitext to the output buffer
4066          * Saves the text into the parser cache if possible.
4067          * Updates templatelinks if it is out of date.
4068          *
4069          * @param $text String
4070          * @param $cache Boolean
4071          * @param $parserOptions mixed ParserOptions object, or boolean false
4072          */
4073         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
4074                 global $wgOut;
4075
4076                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
4077                 $wgOut->addParserOutput( $this->mParserOutput );
4078         }
4079
4080         /**
4081          * This does all the heavy lifting for outputWikitext, except it returns the parser
4082          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
4083          * say, embedding thread pages within a discussion system (LiquidThreads)
4084          *
4085          * @param $text string
4086          * @param $cache boolean
4087          * @param $parserOptions parsing options, defaults to false
4088          * @return string containing parsed output
4089          */
4090         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
4091                 global $wgParser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
4092
4093                 if ( !$parserOptions ) {
4094                         $parserOptions = $this->getParserOptions();
4095                 }
4096
4097                 $time = - wfTime();
4098                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
4099                         $parserOptions, true, true, $this->getRevIdFetched() );
4100                 $time += wfTime();
4101
4102                 # Timing hack
4103                 if ( $time > 3 ) {
4104                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
4105                                 $this->mTitle->getPrefixedDBkey() ) );
4106                 }
4107
4108                 if ( $wgEnableParserCache && $cache && $this && $this->mParserOutput->getCacheTime() != -1 ) {
4109                         $parserCache = ParserCache::singleton();
4110                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
4111                 }
4112                 // Make sure file cache is not used on uncacheable content.
4113                 // Output that has magic words in it can still use the parser cache
4114                 // (if enabled), though it will generally expire sooner.
4115                 if ( $this->mParserOutput->getCacheTime() == -1 || $this->mParserOutput->containsOldMagic() ) {
4116                         $wgUseFileCache = false;
4117                 }
4118                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4119                 return $this->mParserOutput;
4120         }
4121
4122         /**
4123          * Get parser options suitable for rendering the primary article wikitext
4124          * @return mixed ParserOptions object or boolean false
4125          */
4126         public function getParserOptions() {
4127                 global $wgUser;
4128                 if ( !$this->mParserOptions ) {
4129                         $this->mParserOptions = new ParserOptions( $wgUser );
4130                         $this->mParserOptions->setTidy( true );
4131                         $this->mParserOptions->enableLimitReport();
4132                 }
4133                 return $this->mParserOptions;
4134         }
4135
4136         /**
4137          * Updates cascading protections
4138          *
4139          * @param $parserOutput mixed ParserOptions object, or boolean false
4140          **/
4141
4142         protected function doCascadeProtectionUpdates( $parserOutput ) {
4143                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4144                         return;
4145                 }
4146
4147                 // templatelinks table may have become out of sync,
4148                 // especially if using variable-based transclusions.
4149                 // For paranoia, check if things have changed and if
4150                 // so apply updates to the database. This will ensure
4151                 // that cascaded protections apply as soon as the changes
4152                 // are visible.
4153
4154                 # Get templates from templatelinks
4155                 $id = $this->mTitle->getArticleID();
4156
4157                 $tlTemplates = array();
4158
4159                 $dbr = wfGetDB( DB_SLAVE );
4160                 $res = $dbr->select( array( 'templatelinks' ),
4161                         array( 'tl_namespace', 'tl_title' ),
4162                         array( 'tl_from' => $id ),
4163                         __METHOD__ );
4164
4165                 global $wgContLang;
4166                 foreach ( $res as $row ) {
4167                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4168                 }
4169
4170                 # Get templates from parser output.
4171                 $poTemplates = array();
4172                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4173                         foreach ( $templates as $dbk => $id ) {
4174                                 $poTemplates["$ns:$dbk"] = true;
4175                         }
4176                 }
4177
4178                 # Get the diff
4179                 # Note that we simulate array_diff_key in PHP <5.0.x
4180                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4181
4182                 if ( count( $templates_diff ) > 0 ) {
4183                         # Whee, link updates time.
4184                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4185                         $u->doUpdate();
4186                 }
4187         }
4188
4189         /**
4190          * Update all the appropriate counts in the category table, given that
4191          * we've added the categories $added and deleted the categories $deleted.
4192          *
4193          * @param $added array   The names of categories that were added
4194          * @param $deleted array The names of categories that were deleted
4195          */
4196         public function updateCategoryCounts( $added, $deleted ) {
4197                 $ns = $this->mTitle->getNamespace();
4198                 $dbw = wfGetDB( DB_MASTER );
4199
4200                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4201                 # exist, we might legitimately not create it, but it's simpler to just
4202                 # create it and then give it a negative value, since the value is bogus
4203                 # anyway.
4204                 #
4205                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4206                 $insertCats = array_merge( $added, $deleted );
4207                 if ( !$insertCats ) {
4208                         # Okay, nothing to do
4209                         return;
4210                 }
4211                 $insertRows = array();
4212                 foreach ( $insertCats as $cat ) {
4213                         $insertRows[] = array(
4214                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
4215                                 'cat_title' => $cat
4216                         );
4217                 }
4218                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4219
4220                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4221                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4222                 if ( $ns == NS_CATEGORY ) {
4223                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4224                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4225                 } elseif ( $ns == NS_FILE ) {
4226                         $addFields[]    = 'cat_files = cat_files + 1';
4227                         $removeFields[] = 'cat_files = cat_files - 1';
4228                 }
4229
4230                 if ( $added ) {
4231                         $dbw->update(
4232                                 'category',
4233                                 $addFields,
4234                                 array( 'cat_title' => $added ),
4235                                 __METHOD__
4236                         );
4237                 }
4238                 if ( $deleted ) {
4239                         $dbw->update(
4240                                 'category',
4241                                 $removeFields,
4242                                 array( 'cat_title' => $deleted ),
4243                                 __METHOD__
4244                         );
4245                 }
4246         }
4247
4248         /**
4249          * Lightweight method to get the parser output for a page, checking the parser cache
4250          * and so on. Doesn't consider most of the stuff that Article::view is forced to
4251          * consider, so it's not appropriate to use there.
4252          *
4253          * @param $oldid mixed integer Revision ID or null
4254          */
4255         public function getParserOutput( $oldid = null ) {
4256                 global $wgEnableParserCache, $wgUser, $wgOut;
4257
4258                 // Should the parser cache be used?
4259                 $useParserCache = $wgEnableParserCache &&
4260                           intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
4261                           $this->exists() &&
4262                           $oldid === null;
4263
4264                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4265                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
4266                         wfIncrStats( 'pcache_miss_stub' );
4267                 }
4268
4269                 $parserOutput = false;
4270                 if ( $useParserCache ) {
4271                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4272                 }
4273
4274                 if ( $parserOutput === false ) {
4275                         // Cache miss; parse and output it.
4276                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4277
4278                         return $this->getOutputFromWikitext( $rev->getText(), $useParserCache );
4279                 } else {
4280                         return $parserOutput;
4281                 }
4282         }
4283 }