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( __FUNC__ );
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                 $this->mTitle->invalidateCache();
1509         }
1510
1511         /**
1512          * Removes trackback record for current article from trackbacks table
1513          */
1514         public function deletetrackback() {
1515                 global $wgUser, $wgRequest, $wgOut;
1516                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
1517                         $wgOut->addWikiMsg( 'sessionfailure' );
1518                         return;
1519                 }
1520
1521                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1522                 if ( count( $permission_errors ) ) {
1523                         $wgOut->showPermissionsErrorPage( $permission_errors );
1524                         return;
1525                 }
1526
1527                 $db = wfGetDB( DB_MASTER );
1528                 $db->delete( 'trackbacks', array( 'tb_id' => $wgRequest->getInt( 'tbid' ) ) );
1529
1530                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1531                 $this->mTitle->invalidateCache();
1532         }
1533
1534         /**
1535          * Handle action=render
1536          */
1537
1538         public function render() {
1539                 global $wgOut;
1540                 $wgOut->setArticleBodyOnly( true );
1541                 $this->view();
1542         }
1543
1544         /**
1545          * Handle action=purge
1546          */
1547         public function purge() {
1548                 global $wgUser, $wgRequest, $wgOut;
1549                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1550                         if ( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1551                                 $this->doPurge();
1552                                 $this->view();
1553                         }
1554                 } else {
1555                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1556                         $button = wfMsgExt( 'confirm_purge_button', array( 'escapenoentities' ) );
1557                         $form = "<form method=\"post\" action=\"$action\">\n" .
1558                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1559                                         "</form>\n";
1560                         $top = wfMsgExt( 'confirm-purge-top', array( 'parse' ) );
1561                         $bottom = wfMsgExt( 'confirm-purge-bottom', array( 'parse' ) );
1562                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1563                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1564                         $wgOut->addHTML( $top . $form . $bottom );
1565                 }
1566         }
1567
1568         /**
1569          * Perform the actions of a page purging
1570          */
1571         public function doPurge() {
1572                 global $wgUseSquid;
1573                 // Invalidate the cache
1574                 $this->mTitle->invalidateCache();
1575
1576                 if ( $wgUseSquid ) {
1577                         // Commit the transaction before the purge is sent
1578                         $dbw = wfGetDB( DB_MASTER );
1579                         $dbw->commit();
1580
1581                         // Send purge
1582                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1583                         $update->doUpdate();
1584                 }
1585                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1586                         global $wgMessageCache;
1587                         if ( $this->getID() == 0 ) {
1588                                 $text = false;
1589                         } else {
1590                                 $text = $this->getRawText();
1591                         }
1592                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1593                 }
1594         }
1595
1596         /**
1597          * Insert a new empty page record for this article.
1598          * This *must* be followed up by creating a revision
1599          * and running $this->updateToLatest( $rev_id );
1600          * or else the record will be left in a funky state.
1601          * Best if all done inside a transaction.
1602          *
1603          * @param $dbw Database
1604          * @return int The newly created page_id key, or false if the title already existed
1605          * @private
1606          */
1607         public function insertOn( $dbw ) {
1608                 wfProfileIn( __METHOD__ );
1609
1610                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1611                 $dbw->insert( 'page', array(
1612                         'page_id'           => $page_id,
1613                         'page_namespace'    => $this->mTitle->getNamespace(),
1614                         'page_title'        => $this->mTitle->getDBkey(),
1615                         'page_counter'      => 0,
1616                         'page_restrictions' => '',
1617                         'page_is_redirect'  => 0, # Will set this shortly...
1618                         'page_is_new'       => 1,
1619                         'page_random'       => wfRandom(),
1620                         'page_touched'      => $dbw->timestamp(),
1621                         'page_latest'       => 0, # Fill this in shortly...
1622                         'page_len'          => 0, # Fill this in shortly...
1623                 ), __METHOD__, 'IGNORE' );
1624
1625                 $affected = $dbw->affectedRows();
1626                 if ( $affected ) {
1627                         $newid = $dbw->insertId();
1628                         $this->mTitle->resetArticleId( $newid );
1629                 }
1630                 wfProfileOut( __METHOD__ );
1631                 return $affected ? $newid : false;
1632         }
1633
1634         /**
1635          * Update the page record to point to a newly saved revision.
1636          *
1637          * @param $dbw Database object
1638          * @param $revision Revision: For ID number, and text used to set
1639                             length and redirect status fields
1640          * @param $lastRevision Integer: if given, will not overwrite the page field
1641          *                      when different from the currently set value.
1642          *                      Giving 0 indicates the new page flag should be set
1643          *                      on.
1644          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1645          *                           removing rows in redirect table.
1646          * @return bool true on success, false on failure
1647          * @private
1648          */
1649         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1650                 wfProfileIn( __METHOD__ );
1651
1652                 $text = $revision->getText();
1653                 $rt = Title::newFromRedirect( $text );
1654
1655                 $conditions = array( 'page_id' => $this->getId() );
1656                 if ( !is_null( $lastRevision ) ) {
1657                         # An extra check against threads stepping on each other
1658                         $conditions['page_latest'] = $lastRevision;
1659                 }
1660
1661                 $dbw->update( 'page',
1662                         array( /* SET */
1663                                 'page_latest'      => $revision->getId(),
1664                                 'page_touched'     => $dbw->timestamp(),
1665                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1666                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1667                                 'page_len'         => strlen( $text ),
1668                         ),
1669                         $conditions,
1670                         __METHOD__ );
1671
1672                 $result = $dbw->affectedRows() != 0;
1673                 if ( $result ) {
1674                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1675                 }
1676
1677                 wfProfileOut( __METHOD__ );
1678                 return $result;
1679         }
1680
1681         /**
1682          * Add row to the redirect table if this is a redirect, remove otherwise.
1683          *
1684          * @param $dbw Database
1685          * @param $redirectTitle a title object pointing to the redirect target,
1686          *                       or NULL if this is not a redirect
1687          * @param $lastRevIsRedirect If given, will optimize adding and
1688          *                           removing rows in redirect table.
1689          * @return bool true on success, false on failure
1690          * @private
1691          */
1692         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1693                 // Always update redirects (target link might have changed)
1694                 // Update/Insert if we don't know if the last revision was a redirect or not
1695                 // Delete if changing from redirect to non-redirect
1696                 $isRedirect = !is_null( $redirectTitle );
1697                 if ( $isRedirect || is_null( $lastRevIsRedirect ) || $lastRevIsRedirect !== $isRedirect ) {
1698                         wfProfileIn( __METHOD__ );
1699                         if ( $isRedirect ) {
1700                                 // This title is a redirect, Add/Update row in the redirect table
1701                                 $set = array( /* SET */
1702                                         'rd_namespace' => $redirectTitle->getNamespace(),
1703                                         'rd_title'     => $redirectTitle->getDBkey(),
1704                                         'rd_from'      => $this->getId(),
1705                                 );
1706                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1707                         } else {
1708                                 // This is not a redirect, remove row from redirect table
1709                                 $where = array( 'rd_from' => $this->getId() );
1710                                 $dbw->delete( 'redirect', $where, __METHOD__ );
1711                         }
1712                         if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1713                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1714                         }
1715                         wfProfileOut( __METHOD__ );
1716                         return ( $dbw->affectedRows() != 0 );
1717                 }
1718                 return true;
1719         }
1720
1721         /**
1722          * If the given revision is newer than the currently set page_latest,
1723          * update the page record. Otherwise, do nothing.
1724          *
1725          * @param $dbw Database object
1726          * @param $revision Revision object
1727          * @return mixed
1728          */
1729         public function updateIfNewerOn( &$dbw, $revision ) {
1730                 wfProfileIn( __METHOD__ );
1731                 $row = $dbw->selectRow(
1732                         array( 'revision', 'page' ),
1733                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1734                         array(
1735                                 'page_id' => $this->getId(),
1736                                 'page_latest=rev_id' ),
1737                         __METHOD__ );
1738                 if ( $row ) {
1739                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1740                                 wfProfileOut( __METHOD__ );
1741                                 return false;
1742                         }
1743                         $prev = $row->rev_id;
1744                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1745                 } else {
1746                         # No or missing previous revision; mark the page as new
1747                         $prev = 0;
1748                         $lastRevIsRedirect = null;
1749                 }
1750                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1751                 wfProfileOut( __METHOD__ );
1752                 return $ret;
1753         }
1754
1755         /**
1756          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1757          * @return string Complete article text, or null if error
1758          */
1759         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1760                 wfProfileIn( __METHOD__ );
1761                 if ( strval( $section ) == '' ) {
1762                         // Whole-page edit; let the whole text through
1763                 } else {
1764                         if ( is_null( $edittime ) ) {
1765                                 $rev = Revision::newFromTitle( $this->mTitle );
1766                         } else {
1767                                 $dbw = wfGetDB( DB_MASTER );
1768                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1769                         }
1770                         if ( !$rev ) {
1771                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1772                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1773                                 return null;
1774                         }
1775                         $oldtext = $rev->getText();
1776
1777                         if ( $section == 'new' ) {
1778                                 # Inserting a new section
1779                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1780                                 $text = strlen( trim( $oldtext ) ) > 0
1781                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1782                                                 : "{$subject}{$text}";
1783                         } else {
1784                                 # Replacing an existing section; roll out the big guns
1785                                 global $wgParser;
1786                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1787                         }
1788                 }
1789                 wfProfileOut( __METHOD__ );
1790                 return $text;
1791         }
1792
1793         /**
1794          * This function is not deprecated until somebody fixes the core not to use
1795          * it. Nevertheless, use Article::doEdit() instead.
1796          */
1797         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC = false, $comment = false, $bot = false ) {
1798                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1799                         ( $isminor ? EDIT_MINOR : 0 ) |
1800                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1801                         ( $bot ? EDIT_FORCE_BOT : 0 );
1802
1803                 # If this is a comment, add the summary as headline
1804                 if ( $comment && $summary != "" ) {
1805                         $text = wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" . $text;
1806                 }
1807
1808                 $this->doEdit( $text, $summary, $flags );
1809
1810                 $dbw = wfGetDB( DB_MASTER );
1811                 if ( $watchthis ) {
1812                         if ( !$this->mTitle->userIsWatching() ) {
1813                                 $dbw->begin();
1814                                 $this->doWatch();
1815                                 $dbw->commit();
1816                         }
1817                 } else {
1818                         if ( $this->mTitle->userIsWatching() ) {
1819                                 $dbw->begin();
1820                                 $this->doUnwatch();
1821                                 $dbw->commit();
1822                         }
1823                 }
1824                 $this->doRedirect( $this->isRedirect( $text ) );
1825         }
1826
1827         /**
1828          * @deprecated use Article::doEdit()
1829          */
1830         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1831                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1832                         ( $minor ? EDIT_MINOR : 0 ) |
1833                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1834
1835                 $status = $this->doEdit( $text, $summary, $flags );
1836                 if ( !$status->isOK() ) {
1837                         return false;
1838                 }
1839
1840                 $dbw = wfGetDB( DB_MASTER );
1841                 if ( $watchthis ) {
1842                         if ( !$this->mTitle->userIsWatching() ) {
1843                                 $dbw->begin();
1844                                 $this->doWatch();
1845                                 $dbw->commit();
1846                         }
1847                 } else {
1848                         if ( $this->mTitle->userIsWatching() ) {
1849                                 $dbw->begin();
1850                                 $this->doUnwatch();
1851                                 $dbw->commit();
1852                         }
1853                 }
1854
1855                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1856                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1857
1858                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1859                 return true;
1860         }
1861
1862         /**
1863          * Article::doEdit()
1864          *
1865          * Change an existing article or create a new article. Updates RC and all necessary caches,
1866          * optionally via the deferred update array.
1867          *
1868          * $wgUser must be set before calling this function.
1869          *
1870          * @param $text String: new text
1871          * @param $summary String: edit summary
1872          * @param $flags Integer bitfield:
1873          *      EDIT_NEW
1874          *          Article is known or assumed to be non-existent, create a new one
1875          *      EDIT_UPDATE
1876          *          Article is known or assumed to be pre-existing, update it
1877          *      EDIT_MINOR
1878          *          Mark this edit minor, if the user is allowed to do so
1879          *      EDIT_SUPPRESS_RC
1880          *          Do not log the change in recentchanges
1881          *      EDIT_FORCE_BOT
1882          *          Mark the edit a "bot" edit regardless of user rights
1883          *      EDIT_DEFER_UPDATES
1884          *          Defer some of the updates until the end of index.php
1885          *      EDIT_AUTOSUMMARY
1886          *          Fill in blank summaries with generated text where possible
1887          *
1888          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1889          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1890          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1891          * edit-already-exists error will be returned. These two conditions are also possible with
1892          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1893          *
1894          * @param $baseRevId the revision ID this edit was based off, if any
1895          * @param $user Optional user object, $wgUser will be used if not passed
1896          *
1897          * @return Status object. Possible errors:
1898          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1899          *     edit-gone-missing:       In update mode, but the article didn't exist
1900          *     edit-conflict:           In update mode, the article changed unexpectedly
1901          *     edit-no-change:          Warning that the text was the same as before
1902          *     edit-already-exists:     In creation mode, but the article already exists
1903          *
1904          *  Extensions may define additional errors.
1905          *
1906          *  $return->value will contain an associative array with members as follows:
1907          *     new:                     Boolean indicating if the function attempted to create a new article
1908          *     revision:                The revision object for the inserted revision, or null
1909          *
1910          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1911          */
1912         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1913                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1914
1915                 # Low-level sanity check
1916                 if ( $this->mTitle->getText() == '' ) {
1917                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1918                 }
1919
1920                 wfProfileIn( __METHOD__ );
1921
1922                 $user = is_null( $user ) ? $wgUser : $user;
1923                 $status = Status::newGood( array() );
1924
1925                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1926                 $this->loadPageData();
1927
1928                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1929                         $aid = $this->mTitle->getArticleID();
1930                         if ( $aid ) {
1931                                 $flags |= EDIT_UPDATE;
1932                         } else {
1933                                 $flags |= EDIT_NEW;
1934                         }
1935                 }
1936
1937                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1938                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1939                 {
1940                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1941                         wfProfileOut( __METHOD__ );
1942                         if ( $status->isOK() ) {
1943                                 $status->fatal( 'edit-hook-aborted' );
1944                         }
1945                         return $status;
1946                 }
1947
1948                 # Silently ignore EDIT_MINOR if not allowed
1949                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1950                 $bot = $flags & EDIT_FORCE_BOT;
1951
1952                 $oldtext = $this->getRawText(); // current revision
1953                 $oldsize = strlen( $oldtext );
1954
1955                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1956                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1957                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1958                 }
1959
1960                 $editInfo = $this->prepareTextForEdit( $text );
1961                 $text = $editInfo->pst;
1962                 $newsize = strlen( $text );
1963
1964                 $dbw = wfGetDB( DB_MASTER );
1965                 $now = wfTimestampNow();
1966                 $this->mTimestamp = $now;
1967
1968                 if ( $flags & EDIT_UPDATE ) {
1969                         # Update article, but only if changed.
1970                         $status->value['new'] = false;
1971                         # Make sure the revision is either completely inserted or not inserted at all
1972                         if ( !$wgDBtransactions ) {
1973                                 $userAbort = ignore_user_abort( true );
1974                         }
1975
1976                         $revisionId = 0;
1977
1978                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1979
1980                         if ( $changed ) {
1981                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1982                                   - (int)$this->isCountable( $oldtext );
1983                                 $this->mTotalAdjustment = 0;
1984
1985                                 if ( !$this->mLatest ) {
1986                                         # Article gone missing
1987                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1988                                         $status->fatal( 'edit-gone-missing' );
1989                                         wfProfileOut( __METHOD__ );
1990                                         return $status;
1991                                 }
1992
1993                                 $revision = new Revision( array(
1994                                         'page'       => $this->getId(),
1995                                         'comment'    => $summary,
1996                                         'minor_edit' => $isminor,
1997                                         'text'       => $text,
1998                                         'parent_id'  => $this->mLatest,
1999                                         'user'       => $user->getId(),
2000                                         'user_text'  => $user->getName(),
2001                                         ) );
2002
2003                                 $dbw->begin();
2004                                 $revisionId = $revision->insertOn( $dbw );
2005
2006                                 # Update page
2007                                 #
2008                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
2009                                 # during the course of this function. This makes sure that EditPage can detect
2010                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
2011                                 # before this function is called. A previous function used a separate query, this
2012                                 # creates a window where concurrent edits can cause an ignored edit conflict.
2013                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
2014
2015                                 if ( !$ok ) {
2016                                         /* Belated edit conflict! Run away!! */
2017                                         $status->fatal( 'edit-conflict' );
2018                                         # Delete the invalid revision if the DB is not transactional
2019                                         if ( !$wgDBtransactions ) {
2020                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
2021                                         }
2022                                         $revisionId = 0;
2023                                         $dbw->rollback();
2024                                 } else {
2025                                         global $wgUseRCPatrol;
2026                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
2027                                         # Update recentchanges
2028                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2029                                                 # Mark as patrolled if the user can do so
2030                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan( 'autopatrol' );
2031                                                 # Add RC row to the DB
2032                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
2033                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
2034                                                         $revisionId, $patrolled
2035                                                 );
2036                                                 # Log auto-patrolled edits
2037                                                 if ( $patrolled ) {
2038                                                         PatrolLog::record( $rc, true );
2039                                                 }
2040                                         }
2041                                         $user->incEditCount();
2042                                         $dbw->commit();
2043                                 }
2044                         } else {
2045                                 $status->warning( 'edit-no-change' );
2046                                 $revision = null;
2047                                 // Keep the same revision ID, but do some updates on it
2048                                 $revisionId = $this->getRevIdFetched();
2049                                 // Update page_touched, this is usually implicit in the page update
2050                                 // Other cache updates are done in onArticleEdit()
2051                                 $this->mTitle->invalidateCache();
2052                         }
2053
2054                         if ( !$wgDBtransactions ) {
2055                                 ignore_user_abort( $userAbort );
2056                         }
2057                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2058                         if ( !$status->isOK() ) {
2059                                 wfProfileOut( __METHOD__ );
2060                                 return $status;
2061                         }
2062
2063                         # Invalidate cache of this article and all pages using this article
2064                         # as a template. Partly deferred.
2065                         Article::onArticleEdit( $this->mTitle );
2066                         # Update links tables, site stats, etc.
2067                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
2068                 } else {
2069                         # Create new article
2070                         $status->value['new'] = true;
2071
2072                         # Set statistics members
2073                         # We work out if it's countable after PST to avoid counter drift
2074                         # when articles are created with {{subst:}}
2075                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2076                         $this->mTotalAdjustment = 1;
2077
2078                         $dbw->begin();
2079
2080                         # Add the page record; stake our claim on this title!
2081                         # This will return false if the article already exists
2082                         $newid = $this->insertOn( $dbw );
2083
2084                         if ( $newid === false ) {
2085                                 $dbw->rollback();
2086                                 $status->fatal( 'edit-already-exists' );
2087                                 wfProfileOut( __METHOD__ );
2088                                 return $status;
2089                         }
2090
2091                         # Save the revision text...
2092                         $revision = new Revision( array(
2093                                 'page'       => $newid,
2094                                 'comment'    => $summary,
2095                                 'minor_edit' => $isminor,
2096                                 'text'       => $text,
2097                                 'user'       => $user->getId(),
2098                                 'user_text'  => $user->getName(),
2099                                 ) );
2100                         $revisionId = $revision->insertOn( $dbw );
2101
2102                         $this->mTitle->resetArticleID( $newid );
2103
2104                         # Update the page record with revision data
2105                         $this->updateRevisionOn( $dbw, $revision, 0 );
2106
2107                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2108                         # Update recentchanges
2109                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2110                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2111                                 # Mark as patrolled if the user can do so
2112                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && $this->mTitle->userCan( 'autopatrol' );
2113                                 # Add RC row to the DB
2114                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2115                                         '', strlen( $text ), $revisionId, $patrolled );
2116                                 # Log auto-patrolled edits
2117                                 if ( $patrolled ) {
2118                                         PatrolLog::record( $rc, true );
2119                                 }
2120                         }
2121                         $user->incEditCount();
2122                         $dbw->commit();
2123
2124                         # Update links, etc.
2125                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
2126
2127                         # Clear caches
2128                         Article::onArticleCreate( $this->mTitle );
2129
2130                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2131                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
2132                 }
2133
2134                 # Do updates right now unless deferral was requested
2135                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2136                         wfDoUpdates();
2137                 }
2138
2139                 // Return the new revision (or null) to the caller
2140                 $status->value['revision'] = $revision;
2141
2142                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2143                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
2144
2145                 wfProfileOut( __METHOD__ );
2146                 return $status;
2147         }
2148
2149         /**
2150          * @deprecated wrapper for doRedirect
2151          */
2152         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
2153                 wfDeprecated( __METHOD__ );
2154                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
2155         }
2156
2157         /**
2158          * Output a redirect back to the article.
2159          * This is typically used after an edit.
2160          *
2161          * @param $noRedir Boolean: add redirect=no
2162          * @param $sectionAnchor String: section to redirect to, including "#"
2163          * @param $extraQuery String: extra query params
2164          */
2165         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2166                 global $wgOut;
2167                 if ( $noRedir ) {
2168                         $query = 'redirect=no';
2169                         if ( $extraQuery )
2170                                 $query .= "&$query";
2171                 } else {
2172                         $query = $extraQuery;
2173                 }
2174                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2175         }
2176
2177         /**
2178          * Mark this particular edit/page as patrolled
2179          */
2180         public function markpatrolled() {
2181                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
2182                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2183
2184                 # If we haven't been given an rc_id value, we can't do anything
2185                 $rcid = (int) $wgRequest->getVal( 'rcid' );
2186                 $rc = RecentChange::newFromId( $rcid );
2187                 if ( is_null( $rc ) ) {
2188                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2189                         return;
2190                 }
2191
2192                 # It would be nice to see where the user had actually come from, but for now just guess
2193                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2194                 $return = SpecialPage::getTitleFor( $returnto );
2195
2196                 $dbw = wfGetDB( DB_MASTER );
2197                 $errors = $rc->doMarkPatrolled();
2198
2199                 if ( in_array( array( 'rcpatroldisabled' ), $errors ) ) {
2200                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2201                         return;
2202                 }
2203
2204                 if ( in_array( array( 'hookaborted' ), $errors ) ) {
2205                         // The hook itself has handled any output
2206                         return;
2207                 }
2208
2209                 if ( in_array( array( 'markedaspatrollederror-noautopatrol' ), $errors ) ) {
2210                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2211                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2212                         $wgOut->returnToMain( false, $return );
2213                         return;
2214                 }
2215
2216                 if ( !empty( $errors ) ) {
2217                         $wgOut->showPermissionsErrorPage( $errors );
2218                         return;
2219                 }
2220
2221                 # Inform the user
2222                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2223                 $wgOut->addWikiMsg( 'markedaspatrolledtext', $rc->getTitle()->getPrefixedText() );
2224                 $wgOut->returnToMain( false, $return );
2225         }
2226
2227         /**
2228          * User-interface handler for the "watch" action
2229          */
2230         public function watch() {
2231                 global $wgUser, $wgOut;
2232                 if ( $wgUser->isAnon() ) {
2233                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2234                         return;
2235                 }
2236                 if ( wfReadOnly() ) {
2237                         $wgOut->readOnlyPage();
2238                         return;
2239                 }
2240                 if ( $this->doWatch() ) {
2241                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
2242                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2243                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
2244                 }
2245                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2246         }
2247
2248         /**
2249          * Add this page to $wgUser's watchlist
2250          * @return bool true on successful watch operation
2251          */
2252         public function doWatch() {
2253                 global $wgUser;
2254                 if ( $wgUser->isAnon() ) {
2255                         return false;
2256                 }
2257                 if ( wfRunHooks( 'WatchArticle', array( &$wgUser, &$this ) ) ) {
2258                         $wgUser->addWatch( $this->mTitle );
2259                         return wfRunHooks( 'WatchArticleComplete', array( &$wgUser, &$this ) );
2260                 }
2261                 return false;
2262         }
2263
2264         /**
2265          * User interface handler for the "unwatch" action.
2266          */
2267         public function unwatch() {
2268                 global $wgUser, $wgOut;
2269                 if ( $wgUser->isAnon() ) {
2270                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2271                         return;
2272                 }
2273                 if ( wfReadOnly() ) {
2274                         $wgOut->readOnlyPage();
2275                         return;
2276                 }
2277                 if ( $this->doUnwatch() ) {
2278                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
2279                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2280                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
2281                 }
2282                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2283         }
2284
2285         /**
2286          * Stop watching a page
2287          * @return bool true on successful unwatch
2288          */
2289         public function doUnwatch() {
2290                 global $wgUser;
2291                 if ( $wgUser->isAnon() ) {
2292                         return false;
2293                 }
2294                 if ( wfRunHooks( 'UnwatchArticle', array( &$wgUser, &$this ) ) ) {
2295                         $wgUser->removeWatch( $this->mTitle );
2296                         return wfRunHooks( 'UnwatchArticleComplete', array( &$wgUser, &$this ) );
2297                 }
2298                 return false;
2299         }
2300
2301         /**
2302          * action=protect handler
2303          */
2304         public function protect() {
2305                 $form = new ProtectionForm( $this );
2306                 $form->execute();
2307         }
2308
2309         /**
2310          * action=unprotect handler (alias)
2311          */
2312         public function unprotect() {
2313                 $this->protect();
2314         }
2315
2316         /**
2317          * Update the article's restriction field, and leave a log entry.
2318          *
2319          * @param $limit Array: set of restriction keys
2320          * @param $reason String
2321          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2322          * @param $expiry Array: per restriction type expiration
2323          * @return bool true on success
2324          */
2325         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2326                 global $wgUser, $wgContLang;
2327
2328                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2329
2330                 $id = $this->mTitle->getArticleID();
2331                 if ( $id <= 0 ) {
2332                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
2333                         return false;
2334                 }
2335
2336                 if ( wfReadOnly() ) {
2337                         wfDebug( "updateRestrictions failed: read-only\n" );
2338                         return false;
2339                 }
2340
2341                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2342                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2343                         return false;
2344                 }
2345
2346                 if ( !$cascade ) {
2347                         $cascade = false;
2348                 }
2349
2350                 // Take this opportunity to purge out expired restrictions
2351                 Title::purgeExpiredRestrictions();
2352
2353                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2354                 # we expect a single selection, but the schema allows otherwise.
2355                 $current = array();
2356                 $updated = Article::flattenRestrictions( $limit );
2357                 $changed = false;
2358                 foreach ( $restrictionTypes as $action ) {
2359                         if ( isset( $expiry[$action] ) ) {
2360                                 # Get current restrictions on $action
2361                                 $aLimits = $this->mTitle->getRestrictions( $action );
2362                                 $current[$action] = implode( '', $aLimits );
2363                                 # Are any actual restrictions being dealt with here?
2364                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
2365                                 # If something changed, we need to log it. Checking $aRChanged
2366                                 # assures that "unprotecting" a page that is not protected does
2367                                 # not log just because the expiry was "changed".
2368                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2369                                         $changed = true;
2370                                 }
2371                         }
2372                 }
2373
2374                 $current = Article::flattenRestrictions( $current );
2375
2376                 $changed = ( $changed || $current != $updated );
2377                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
2378                 $protect = ( $updated != '' );
2379
2380                 # If nothing's changed, do nothing
2381                 if ( $changed ) {
2382                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2383
2384                                 $dbw = wfGetDB( DB_MASTER );
2385
2386                                 # Prepare a null revision to be added to the history
2387                                 $modified = $current != '' && $protect;
2388                                 if ( $protect ) {
2389                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2390                                 } else {
2391                                         $comment_type = 'unprotectedarticle';
2392                                 }
2393                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2394
2395                                 # Only restrictions with the 'protect' right can cascade...
2396                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2397                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2398                                 # The schema allows multiple restrictions
2399                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) )
2400                                         $cascade = false;
2401                                 $cascade_description = '';
2402                                 if ( $cascade ) {
2403                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2404                                 }
2405
2406                                 if ( $reason )
2407                                         $comment .= ": $reason";
2408
2409                                 $editComment = $comment;
2410                                 $encodedExpiry = array();
2411                                 $protect_description = '';
2412                                 foreach ( $limit as $action => $restrictions  ) {
2413                                         if ( !isset( $expiry[$action] ) )
2414                                                 $expiry[$action] = 'infinite';
2415
2416                                         $encodedExpiry[$action] = Block::encodeExpiry( $expiry[$action], $dbw );
2417                                         if ( $restrictions != '' ) {
2418                                                 $protect_description .= "[$action=$restrictions] (";
2419                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2420                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2421                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2422                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2423                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2424                                                 } else {
2425                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2426                                                 }
2427                                                 $protect_description .= ') ';
2428                                         }
2429                                 }
2430                                 $protect_description = trim( $protect_description );
2431
2432                                 if ( $protect_description && $protect )
2433                                         $editComment .= " ($protect_description)";
2434                                 if ( $cascade )
2435                                         $editComment .= "$cascade_description";
2436                                 # Update restrictions table
2437                                 foreach ( $limit as $action => $restrictions ) {
2438                                         if ( $restrictions != '' ) {
2439                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2440                                                         array( 'pr_page' => $id,
2441                                                                 'pr_type' => $action,
2442                                                                 'pr_level' => $restrictions,
2443                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2444                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
2445                                         } else {
2446                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2447                                                         'pr_type' => $action ), __METHOD__ );
2448                                         }
2449                                 }
2450
2451                                 # Insert a null revision
2452                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2453                                 $nullRevId = $nullRevision->insertOn( $dbw );
2454
2455                                 $latest = $this->getLatest();
2456                                 # Update page record
2457                                 $dbw->update( 'page',
2458                                         array( /* SET */
2459                                                 'page_touched' => $dbw->timestamp(),
2460                                                 'page_restrictions' => '',
2461                                                 'page_latest' => $nullRevId
2462                                         ), array( /* WHERE */
2463                                                 'page_id' => $id
2464                                         ), 'Article::protect'
2465                                 );
2466
2467                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
2468                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2469
2470                                 # Update the protection log
2471                                 $log = new LogPage( 'protect' );
2472                                 if ( $protect ) {
2473                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
2474                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
2475                                 } else {
2476                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2477                                 }
2478
2479                         } # End hook
2480                 } # End "changed" check
2481
2482                 return true;
2483         }
2484
2485         /**
2486          * Take an array of page restrictions and flatten it to a string
2487          * suitable for insertion into the page_restrictions field.
2488          * @param $limit Array
2489          * @return String
2490          */
2491         protected static function flattenRestrictions( $limit ) {
2492                 if ( !is_array( $limit ) ) {
2493                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2494                 }
2495                 $bits = array();
2496                 ksort( $limit );
2497                 foreach ( $limit as $action => $restrictions ) {
2498                         if ( $restrictions != '' ) {
2499                                 $bits[] = "$action=$restrictions";
2500                         }
2501                 }
2502                 return implode( ':', $bits );
2503         }
2504
2505         /**
2506          * Auto-generates a deletion reason
2507          *
2508          * @param &$hasHistory Boolean: whether the page has a history
2509          * @return mixed String containing deletion reason or empty string, or boolean false
2510          *    if no revision occurred
2511          */
2512         public function generateReason( &$hasHistory ) {
2513                 global $wgContLang;
2514                 $dbw = wfGetDB( DB_MASTER );
2515                 // Get the last revision
2516                 $rev = Revision::newFromTitle( $this->mTitle );
2517                 if ( is_null( $rev ) )
2518                         return false;
2519
2520                 // Get the article's contents
2521                 $contents = $rev->getText();
2522                 $blank = false;
2523                 // If the page is blank, use the text from the previous revision,
2524                 // which can only be blank if there's a move/import/protect dummy revision involved
2525                 if ( $contents == '' ) {
2526                         $prev = $rev->getPrevious();
2527                         if ( $prev )    {
2528                                 $contents = $prev->getText();
2529                                 $blank = true;
2530                         }
2531                 }
2532
2533                 // Find out if there was only one contributor
2534                 // Only scan the last 20 revisions
2535                 $res = $dbw->select( 'revision', 'rev_user_text',
2536                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2537                         __METHOD__,
2538                         array( 'LIMIT' => 20 )
2539                 );
2540                 if ( $res === false )
2541                         // This page has no revisions, which is very weird
2542                         return false;
2543
2544                 $hasHistory = ( $res->numRows() > 1 );
2545                 $row = $dbw->fetchObject( $res );
2546                 if ( $row ) { // $row is false if the only contributor is hidden
2547                         $onlyAuthor = $row->rev_user_text;
2548                         // Try to find a second contributor
2549                         foreach ( $res as $row ) {
2550                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2551                                         $onlyAuthor = false;
2552                                         break;
2553                                 }
2554                         }
2555                 } else {
2556                         $onlyAuthor = false;
2557                 }
2558                 $dbw->freeResult( $res );
2559
2560                 // Generate the summary with a '$1' placeholder
2561                 if ( $blank ) {
2562                         // The current revision is blank and the one before is also
2563                         // blank. It's just not our lucky day
2564                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2565                 } else {
2566                         if ( $onlyAuthor )
2567                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2568                         else
2569                                 $reason = wfMsgForContent( 'excontent', '$1' );
2570                 }
2571
2572                 if ( $reason == '-' ) {
2573                         // Allow these UI messages to be blanked out cleanly
2574                         return '';
2575                 }
2576
2577                 // Replace newlines with spaces to prevent uglyness
2578                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2579                 // Calculate the maximum amount of chars to get
2580                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2581                 $maxLength = 255 - ( strlen( $reason ) - 2 ) - 3;
2582                 $contents = $wgContLang->truncate( $contents, $maxLength );
2583                 // Remove possible unfinished links
2584                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2585                 // Now replace the '$1' placeholder
2586                 $reason = str_replace( '$1', $contents, $reason );
2587                 return $reason;
2588         }
2589
2590
2591         /*
2592          * UI entry point for page deletion
2593          */
2594         public function delete() {
2595                 global $wgUser, $wgOut, $wgRequest;
2596
2597                 $confirm = $wgRequest->wasPosted() &&
2598                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2599
2600                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2601                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2602
2603                 $reason = $this->DeleteReasonList;
2604
2605                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
2606                         // Entry from drop down menu + additional comment
2607                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2608                 } elseif ( $reason == 'other' ) {
2609                         $reason = $this->DeleteReason;
2610                 }
2611                 # Flag to hide all contents of the archived revisions
2612                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2613
2614                 # This code desperately needs to be totally rewritten
2615
2616                 # Read-only check...
2617                 if ( wfReadOnly() ) {
2618                         $wgOut->readOnlyPage();
2619                         return;
2620                 }
2621
2622                 # Check permissions
2623                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2624
2625                 if ( count( $permission_errors ) > 0 ) {
2626                         $wgOut->showPermissionsErrorPage( $permission_errors );
2627                         return;
2628                 }
2629
2630                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2631
2632                 # Better double-check that it hasn't been deleted yet!
2633                 $dbw = wfGetDB( DB_MASTER );
2634                 $conds = $this->mTitle->pageCond();
2635                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2636                 if ( $latest === false ) {
2637                         $wgOut->showFatalError(
2638                                 Html::rawElement(
2639                                         'div',
2640                                         array( 'class' => 'error mw-error-cannotdelete' ),
2641                                         wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2642                                 )
2643                         );
2644                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2645                         LogEventsList::showLogExtract(
2646                                 $wgOut,
2647                                 'delete',
2648                                 $this->mTitle->getPrefixedText()
2649                         );
2650                         return;
2651                 }
2652
2653                 # Hack for big sites
2654                 $bigHistory = $this->isBigDeletion();
2655                 if ( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2656                         global $wgLang, $wgDeleteRevisionsLimit;
2657                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2658                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2659                         return;
2660                 }
2661
2662                 if ( $confirm ) {
2663                         $this->doDelete( $reason, $suppress );
2664                         if ( $wgRequest->getCheck( 'wpWatch' ) && $wgUser->isLoggedIn() ) {
2665                                 $this->doWatch();
2666                         } elseif ( $this->mTitle->userIsWatching() ) {
2667                                 $this->doUnwatch();
2668                         }
2669                         return;
2670                 }
2671
2672                 // Generate deletion reason
2673                 $hasHistory = false;
2674                 if ( !$reason ) $reason = $this->generateReason( $hasHistory );
2675
2676                 // If the page has a history, insert a warning
2677                 if ( $hasHistory && !$confirm ) {
2678                         global $wgLang;
2679                         $skin = $wgUser->getSkin();
2680                         $revisions = $this->estimateRevisionCount();
2681                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
2682                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
2683                                 wfMsgHtml( 'word-separator' ) . $skin->historyLink() .
2684                                 '</strong>'
2685                         );
2686                         if ( $bigHistory ) {
2687                                 global $wgDeleteRevisionsLimit;
2688                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2689                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2690                         }
2691                 }
2692
2693                 return $this->confirmDelete( $reason );
2694         }
2695
2696         /**
2697          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2698          */
2699         public function isBigDeletion() {
2700                 global $wgDeleteRevisionsLimit;
2701                 if ( $wgDeleteRevisionsLimit ) {
2702                         $revCount = $this->estimateRevisionCount();
2703                         return $revCount > $wgDeleteRevisionsLimit;
2704                 }
2705                 return false;
2706         }
2707
2708         /**
2709          * @return int approximate revision count
2710          */
2711         public function estimateRevisionCount() {
2712                 $dbr = wfGetDB( DB_SLAVE );
2713                 // For an exact count...
2714                 // return $dbr->selectField( 'revision', 'COUNT(*)',
2715                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2716                 return $dbr->estimateRowCount( 'revision', '*',
2717                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2718         }
2719
2720         /**
2721          * Get the last N authors
2722          * @param $num Integer: number of revisions to get
2723          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2724          * @return array Array of authors, duplicates not removed
2725          */
2726         public function getLastNAuthors( $num, $revLatest = 0 ) {
2727                 wfProfileIn( __METHOD__ );
2728                 // First try the slave
2729                 // If that doesn't have the latest revision, try the master
2730                 $continue = 2;
2731                 $db = wfGetDB( DB_SLAVE );
2732                 do {
2733                         $res = $db->select( array( 'page', 'revision' ),
2734                                 array( 'rev_id', 'rev_user_text' ),
2735                                 array(
2736                                         'page_namespace' => $this->mTitle->getNamespace(),
2737                                         'page_title' => $this->mTitle->getDBkey(),
2738                                         'rev_page = page_id'
2739                                 ), __METHOD__, $this->getSelectOptions( array(
2740                                         'ORDER BY' => 'rev_timestamp DESC',
2741                                         'LIMIT' => $num
2742                                 ) )
2743                         );
2744                         if ( !$res ) {
2745                                 wfProfileOut( __METHOD__ );
2746                                 return array();
2747                         }
2748                         $row = $db->fetchObject( $res );
2749                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2750                                 $db = wfGetDB( DB_MASTER );
2751                                 $continue--;
2752                         } else {
2753                                 $continue = 0;
2754                         }
2755                 } while ( $continue );
2756
2757                 $authors = array( $row->rev_user_text );
2758                 while ( $row = $db->fetchObject( $res ) ) {
2759                         $authors[] = $row->rev_user_text;
2760                 }
2761                 wfProfileOut( __METHOD__ );
2762                 return $authors;
2763         }
2764
2765         /**
2766          * Output deletion confirmation dialog
2767          * @param $reason String: prefilled reason
2768          */
2769         public function confirmDelete( $reason ) {
2770                 global $wgOut, $wgUser;
2771
2772                 wfDebug( "Article::confirmDelete\n" );
2773
2774                 $deleteBackLink = $wgUser->getSkin()->link(
2775                         $this->mTitle,
2776                         null,
2777                         array(),
2778                         array(),
2779                         array( 'known', 'noclasses' )
2780                 );
2781                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
2782                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2783                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2784
2785                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
2786
2787                 if ( $wgUser->isAllowed( 'suppressrevision' ) ) {
2788                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2789                                         <td></td>
2790                                         <td class='mw-input'><strong>" .
2791                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2792                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2793                                         "</strong></td>
2794                                 </tr>";
2795                 } else {
2796                         $suppress = '';
2797                 }
2798                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2799
2800                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2801                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2802                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2803                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2804                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2805                         "<tr id=\"wpDeleteReasonListRow\">
2806                                 <td class='mw-label'>" .
2807                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2808                                 "</td>
2809                                 <td class='mw-input'>" .
2810                                         Xml::listDropDown( 'wpDeleteReasonList',
2811                                                 wfMsgForContent( 'deletereason-dropdown' ),
2812                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2813                                 "</td>
2814                         </tr>
2815                         <tr id=\"wpDeleteReasonRow\">
2816                                 <td class='mw-label'>" .
2817                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2818                                 "</td>
2819                                 <td class='mw-input'>" .
2820                                 Html::input( 'wpReason', $reason, 'text', array(
2821                                         'size' => '60',
2822                                         'maxlength' => '255',
2823                                         'tabindex' => '2',
2824                                         'id' => 'wpReason',
2825                                         'autofocus'
2826                                 ) ) .
2827                                 "</td>
2828                         </tr>";
2829                 # Dissalow watching is user is not logged in
2830                 if ( $wgUser->isLoggedIn() ) {
2831                         $form .= "
2832                         <tr>
2833                                 <td></td>
2834                                 <td class='mw-input'>" .
2835                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2836                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2837                                 "</td>
2838                         </tr>";
2839                 }
2840                 $form .= "
2841                         $suppress
2842                         <tr>
2843                                 <td></td>
2844                                 <td class='mw-submit'>" .
2845                                         Xml::submitButton( wfMsg( 'deletepage' ),
2846                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2847                                 "</td>
2848                         </tr>" .
2849                         Xml::closeElement( 'table' ) .
2850                         Xml::closeElement( 'fieldset' ) .
2851                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2852                         Xml::closeElement( 'form' );
2853
2854                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
2855                                 $skin = $wgUser->getSkin();
2856                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
2857                                 $link = $skin->link(
2858                                         $title,
2859                                         wfMsgHtml( 'delete-edit-reasonlist' ),
2860                                         array(),
2861                                         array( 'action' => 'edit' )
2862                                 );
2863                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2864                         }
2865
2866                 $wgOut->addHTML( $form );
2867                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2868                 LogEventsList::showLogExtract(
2869                         $wgOut,
2870                         'delete',
2871                         $this->mTitle->getPrefixedText()
2872                 );
2873         }
2874
2875         /**
2876          * Perform a deletion and output success or failure messages
2877          */
2878         public function doDelete( $reason, $suppress = false ) {
2879                 global $wgOut, $wgUser;
2880                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2881
2882                 $error = '';
2883                 if ( wfRunHooks( 'ArticleDelete', array( &$this, &$wgUser, &$reason, &$error ) ) ) {
2884                         if ( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2885                                 $deleted = $this->mTitle->getPrefixedText();
2886
2887                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2888                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2889
2890                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2891
2892                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2893                                 $wgOut->returnToMain( false );
2894                                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$wgUser, $reason, $id ) );
2895                         }
2896                 } else {
2897                         if ( $error == '' ) {
2898                                 $wgOut->showFatalError(
2899                                         Html::rawElement(
2900                                                 'div',
2901                                                 array( 'class' => 'error mw-error-cannotdelete' ),
2902                                                 wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2903                                         )
2904                                 );
2905                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2906                                 LogEventsList::showLogExtract(
2907                                         $wgOut,
2908                                         'delete',
2909                                         $this->mTitle->getPrefixedText()
2910                                 );
2911                         } else {
2912                                 $wgOut->showFatalError( $error );
2913                         }
2914                 }
2915         }
2916
2917         /**
2918          * Back-end article deletion
2919          * Deletes the article with database consistency, writes logs, purges caches
2920          *
2921          * @param $reason string delete reason for deletion log
2922          * @param suppress bitfield
2923          *      Revision::DELETED_TEXT
2924          *      Revision::DELETED_COMMENT
2925          *      Revision::DELETED_USER
2926          *      Revision::DELETED_RESTRICTED
2927          * @param $id int article ID
2928          * @param $commit boolean defaults to true, triggers transaction end
2929          * @return boolean true if successful
2930          */
2931         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true ) {
2932                 global $wgUseSquid, $wgDeferredUpdateList;
2933                 global $wgUseTrackbacks;
2934
2935                 wfDebug( __METHOD__ . "\n" );
2936
2937                 $dbw = wfGetDB( DB_MASTER );
2938                 $ns = $this->mTitle->getNamespace();
2939                 $t = $this->mTitle->getDBkey();
2940                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2941
2942                 if ( $t == '' || $id == 0 ) {
2943                         return false;
2944                 }
2945
2946                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable( $this->getRawText() ), -1 );
2947                 array_push( $wgDeferredUpdateList, $u );
2948
2949                 // Bitfields to further suppress the content
2950                 if ( $suppress ) {
2951                         $bitfield = 0;
2952                         // This should be 15...
2953                         $bitfield |= Revision::DELETED_TEXT;
2954                         $bitfield |= Revision::DELETED_COMMENT;
2955                         $bitfield |= Revision::DELETED_USER;
2956                         $bitfield |= Revision::DELETED_RESTRICTED;
2957                 } else {
2958                         $bitfield = 'rev_deleted';
2959                 }
2960
2961                 $dbw->begin();
2962                 // For now, shunt the revision data into the archive table.
2963                 // Text is *not* removed from the text table; bulk storage
2964                 // is left intact to avoid breaking block-compression or
2965                 // immutable storage schemes.
2966                 //
2967                 // For backwards compatibility, note that some older archive
2968                 // table entries will have ar_text and ar_flags fields still.
2969                 //
2970                 // In the future, we may keep revisions and mark them with
2971                 // the rev_deleted field, which is reserved for this purpose.
2972                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2973                         array(
2974                                 'ar_namespace'  => 'page_namespace',
2975                                 'ar_title'      => 'page_title',
2976                                 'ar_comment'    => 'rev_comment',
2977                                 'ar_user'       => 'rev_user',
2978                                 'ar_user_text'  => 'rev_user_text',
2979                                 'ar_timestamp'  => 'rev_timestamp',
2980                                 'ar_minor_edit' => 'rev_minor_edit',
2981                                 'ar_rev_id'     => 'rev_id',
2982                                 'ar_text_id'    => 'rev_text_id',
2983                                 'ar_text'       => '\'\'', // Be explicit to appease
2984                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2985                                 'ar_len'        => 'rev_len',
2986                                 'ar_page_id'    => 'page_id',
2987                                 'ar_deleted'    => $bitfield
2988                         ), array(
2989                                 'page_id' => $id,
2990                                 'page_id = rev_page'
2991                         ), __METHOD__
2992                 );
2993
2994                 # Delete restrictions for it
2995                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2996
2997                 # Now that it's safely backed up, delete it
2998                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2999                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
3000                 if ( !$ok ) {
3001                         $dbw->rollback();
3002                         return false;
3003                 }
3004
3005                 # Fix category table counts
3006                 $cats = array();
3007                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
3008                 foreach ( $res as $row ) {
3009                         $cats [] = $row->cl_to;
3010                 }
3011                 $this->updateCategoryCounts( array(), $cats );
3012
3013                 # If using cascading deletes, we can skip some explicit deletes
3014                 if ( !$dbw->cascadingDeletes() ) {
3015                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
3016
3017                         if ( $wgUseTrackbacks )
3018                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
3019
3020                         # Delete outgoing links
3021                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
3022                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
3023                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
3024                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
3025                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
3026                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
3027                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
3028                 }
3029
3030                 # If using cleanup triggers, we can skip some manual deletes
3031                 if ( !$dbw->cleanupTriggers() ) {
3032                         # Clean up recentchanges entries...
3033                         $dbw->delete( 'recentchanges',
3034                                 array( 'rc_type != ' . RC_LOG,
3035                                         'rc_namespace' => $this->mTitle->getNamespace(),
3036                                         'rc_title' => $this->mTitle->getDBkey() ),
3037                                 __METHOD__ );
3038                         $dbw->delete( 'recentchanges',
3039                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
3040                                 __METHOD__ );
3041                 }
3042
3043                 # Clear caches
3044                 Article::onArticleDelete( $this->mTitle );
3045
3046                 # Clear the cached article id so the interface doesn't act like we exist
3047                 $this->mTitle->resetArticleID( 0 );
3048
3049                 # Log the deletion, if the page was suppressed, log it at Oversight instead
3050                 $logtype = $suppress ? 'suppress' : 'delete';
3051                 $log = new LogPage( $logtype );
3052
3053                 # Make sure logging got through
3054                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
3055
3056                 if ( $commit ) {
3057                         $dbw->commit();
3058                 }
3059
3060                 return true;
3061         }
3062
3063         /**
3064          * Roll back the most recent consecutive set of edits to a page
3065          * from the same user; fails if there are no eligible edits to
3066          * roll back to, e.g. user is the sole contributor. This function
3067          * performs permissions checks on $wgUser, then calls commitRollback()
3068          * to do the dirty work
3069          *
3070          * @param $fromP String: Name of the user whose edits to rollback.
3071          * @param $summary String: Custom summary. Set to default summary if empty.
3072          * @param $token String: Rollback token.
3073          * @param $bot Boolean: If true, mark all reverted edits as bot.
3074          *
3075          * @param $resultDetails Array: contains result-specific array of additional values
3076          *    'alreadyrolled' : 'current' (rev)
3077          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3078          *
3079          * @return array of errors, each error formatted as
3080          *   array(messagekey, param1, param2, ...).
3081          * On success, the array is empty.  This array can also be passed to
3082          * OutputPage::showPermissionsErrorPage().
3083          */
3084         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
3085                 global $wgUser;
3086                 $resultDetails = null;
3087
3088                 # Check permissions
3089                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
3090                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
3091                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3092
3093                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
3094                         $errors[] = array( 'sessionfailure' );
3095
3096                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
3097                         $errors[] = array( 'actionthrottledtext' );
3098                 }
3099                 # If there were errors, bail out now
3100                 if ( !empty( $errors ) )
3101                         return $errors;
3102
3103                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
3104         }
3105
3106         /**
3107          * Backend implementation of doRollback(), please refer there for parameter
3108          * and return value documentation
3109          *
3110          * NOTE: This function does NOT check ANY permissions, it just commits the
3111          * rollback to the DB Therefore, you should only call this function direct-
3112          * ly if you want to use custom permissions checks. If you don't, use
3113          * doRollback() instead.
3114          */
3115         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
3116                 global $wgUseRCPatrol, $wgUser, $wgLang;
3117                 $dbw = wfGetDB( DB_MASTER );
3118
3119                 if ( wfReadOnly() ) {
3120                         return array( array( 'readonlytext' ) );
3121                 }
3122
3123                 # Get the last editor
3124                 $current = Revision::newFromTitle( $this->mTitle );
3125                 if ( is_null( $current ) ) {
3126                         # Something wrong... no page?
3127                         return array( array( 'notanarticle' ) );
3128                 }
3129
3130                 $from = str_replace( '_', ' ', $fromP );
3131                 # User name given should match up with the top revision.
3132                 # If the user was deleted then $from should be empty.
3133                 if ( $from != $current->getUserText() ) {
3134                         $resultDetails = array( 'current' => $current );
3135                         return array( array( 'alreadyrolled',
3136                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3137                                 htmlspecialchars( $fromP ),
3138                                 htmlspecialchars( $current->getUserText() )
3139                         ) );
3140                 }
3141
3142                 # Get the last edit not by this guy...
3143                 # Note: these may not be public values
3144                 $user = intval( $current->getRawUser() );
3145                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3146                 $s = $dbw->selectRow( 'revision',
3147                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3148                         array( 'rev_page' => $current->getPage(),
3149                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3150                         ), __METHOD__,
3151                         array( 'USE INDEX' => 'page_timestamp',
3152                                 'ORDER BY'  => 'rev_timestamp DESC' )
3153                         );
3154                 if ( $s === false ) {
3155                         # No one else ever edited this page
3156                         return array( array( 'cantrollback' ) );
3157                 } else if ( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
3158                         # Only admins can see this text
3159                         return array( array( 'notvisiblerev' ) );
3160                 }
3161
3162                 $set = array();
3163                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
3164                         # Mark all reverted edits as bot
3165                         $set['rc_bot'] = 1;
3166                 }
3167                 if ( $wgUseRCPatrol ) {
3168                         # Mark all reverted edits as patrolled
3169                         $set['rc_patrolled'] = 1;
3170                 }
3171
3172                 if ( count( $set ) ) {
3173                         $dbw->update( 'recentchanges', $set,
3174                                 array( /* WHERE */
3175                                         'rc_cur_id' => $current->getPage(),
3176                                         'rc_user_text' => $current->getUserText(),
3177                                         "rc_timestamp > '{$s->rev_timestamp}'",
3178                                 ), __METHOD__
3179                         );
3180                 }
3181
3182                 # Generate the edit summary if necessary
3183                 $target = Revision::newFromId( $s->rev_id );
3184                 if ( empty( $summary ) ) {
3185                         if ( $from == '' ) { // no public user name
3186                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3187                         } else {
3188                                 $summary = wfMsgForContent( 'revertpage' );
3189                         }
3190                 }
3191
3192                 # Allow the custom summary to use the same args as the default message
3193                 $args = array(
3194                         $target->getUserText(), $from, $s->rev_id,
3195                         $wgLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ), true ),
3196                         $current->getId(), $wgLang->timeanddate( $current->getTimestamp() )
3197                 );
3198                 $summary = wfMsgReplaceArgs( $summary, $args );
3199
3200                 # Save
3201                 $flags = EDIT_UPDATE;
3202
3203                 if ( $wgUser->isAllowed( 'minoredit' ) )
3204                         $flags |= EDIT_MINOR;
3205
3206                 if ( $bot && ( $wgUser->isAllowed( 'markbotedits' ) || $wgUser->isAllowed( 'bot' ) ) )
3207                         $flags |= EDIT_FORCE_BOT;
3208                 # Actually store the edit
3209                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3210                 if ( !empty( $status->value['revision'] ) ) {
3211                         $revId = $status->value['revision']->getId();
3212                 } else {
3213                         $revId = false;
3214                 }
3215
3216                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3217
3218                 $resultDetails = array(
3219                         'summary' => $summary,
3220                         'current' => $current,
3221                         'target'  => $target,
3222                         'newid'   => $revId
3223                 );
3224                 return array();
3225         }
3226
3227         /**
3228          * User interface for rollback operations
3229          */
3230         public function rollback() {
3231                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
3232                 $details = null;
3233
3234                 $result = $this->doRollback(
3235                         $wgRequest->getVal( 'from' ),
3236                         $wgRequest->getText( 'summary' ),
3237                         $wgRequest->getVal( 'token' ),
3238                         $wgRequest->getBool( 'bot' ),
3239                         $details
3240                 );
3241
3242                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
3243                         $wgOut->rateLimited();
3244                         return;
3245                 }
3246                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3247                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3248                         $errArray = $result[0];
3249                         $errMsg = array_shift( $errArray );
3250                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3251                         if ( isset( $details['current'] ) ) {
3252                                 $current = $details['current'];
3253                                 if ( $current->getComment() != '' ) {
3254                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3255                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3256                                 }
3257                         }
3258                         return;
3259                 }
3260                 # Display permissions errors before read-only message -- there's no
3261                 # point in misleading the user into thinking the inability to rollback
3262                 # is only temporary.
3263                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3264                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
3265                         # move any 'readonlytext' error manually.
3266                         $out = array();
3267                         foreach ( $result as $error ) {
3268                                 if ( $error != array( 'readonlytext' ) ) {
3269                                         $out [] = $error;
3270                                 }
3271                         }
3272                         $wgOut->showPermissionsErrorPage( $out );
3273                         return;
3274                 }
3275                 if ( $result == array( array( 'readonlytext' ) ) ) {
3276                         $wgOut->readOnlyPage();
3277                         return;
3278                 }
3279
3280                 $current = $details['current'];
3281                 $target = $details['target'];
3282                 $newId = $details['newid'];
3283                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3284                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3285                 if ( $current->getUserText() === '' ) {
3286                         $old = wfMsg( 'rev-deleted-user' );
3287                 } else {
3288                         $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
3289                                 . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
3290                 }
3291                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
3292                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
3293                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3294                 $wgOut->returnToMain( false, $this->mTitle );
3295
3296                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3297                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3298                         $de->showDiff( '', '' );
3299                 }
3300         }
3301
3302
3303         /**
3304          * Do standard deferred updates after page view
3305          */
3306         public function viewUpdates() {
3307                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3308                 if ( wfReadOnly() ) {
3309                         return;
3310                 }
3311                 # Don't update page view counters on views from bot users (bug 14044)
3312                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
3313                         Article::incViewCount( $this->getID() );
3314                         $u = new SiteStatsUpdate( 1, 0, 0 );
3315                         array_push( $wgDeferredUpdateList, $u );
3316                 }
3317                 # Update newtalk / watchlist notification status
3318                 $wgUser->clearNotification( $this->mTitle );
3319         }
3320
3321         /**
3322          * Prepare text which is about to be saved.
3323          * Returns a stdclass with source, pst and output members
3324          */
3325         public function prepareTextForEdit( $text, $revid = null ) {
3326                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3327                         // Already prepared
3328                         return $this->mPreparedEdit;
3329                 }
3330                 global $wgParser;
3331                 $edit = (object)array();
3332                 $edit->revid = $revid;
3333                 $edit->newText = $text;
3334                 $edit->pst = $this->preSaveTransform( $text );
3335                 $options = $this->getParserOptions();
3336                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
3337                 $edit->oldText = $this->getContent();
3338                 $this->mPreparedEdit = $edit;
3339                 return $edit;
3340         }
3341
3342         /**
3343          * Do standard deferred updates after page edit.
3344          * Update links tables, site stats, search index and message cache.
3345          * Purges pages that include this page if the text was changed here.
3346          * Every 100th edit, prune the recent changes table.
3347          *
3348          * @private
3349          * @param $text New text of the article
3350          * @param $summary Edit summary
3351          * @param $minoredit Minor edit
3352          * @param $timestamp_of_pagechange Timestamp associated with the page change
3353          * @param $newid rev_id value of the new revision
3354          * @param $changed Whether or not the content actually changed
3355          */
3356         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
3357                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgEnableParserCache;
3358
3359                 wfProfileIn( __METHOD__ );
3360
3361                 # Parse the text
3362                 # Be careful not to double-PST: $text is usually already PST-ed once
3363                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3364                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3365                         $editInfo = $this->prepareTextForEdit( $text, $newid );
3366                 } else {
3367                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3368                         $editInfo = $this->mPreparedEdit;
3369                 }
3370
3371                 # Save it to the parser cache
3372                 if ( $wgEnableParserCache ) {
3373                         $popts = $this->getParserOptions();
3374                         $parserCache = ParserCache::singleton();
3375                         $parserCache->save( $editInfo->output, $this, $popts );
3376                 }
3377
3378                 # Update the links tables
3379                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3380                 $u->doUpdate();
3381
3382                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3383
3384                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3385                         if ( 0 == mt_rand( 0, 99 ) ) {
3386                                 // Flush old entries from the `recentchanges` table; we do this on
3387                                 // random requests so as to avoid an increase in writes for no good reason
3388                                 global $wgRCMaxAge;
3389                                 $dbw = wfGetDB( DB_MASTER );
3390                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3391                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3392                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3393                                 $dbw->query( $sql );
3394                         }
3395                 }
3396
3397                 $id = $this->getID();
3398                 $title = $this->mTitle->getPrefixedDBkey();
3399                 $shortTitle = $this->mTitle->getDBkey();
3400
3401                 if ( 0 == $id ) {
3402                         wfProfileOut( __METHOD__ );
3403                         return;
3404                 }
3405
3406                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3407                 array_push( $wgDeferredUpdateList, $u );
3408                 $u = new SearchUpdate( $id, $title, $text );
3409                 array_push( $wgDeferredUpdateList, $u );
3410
3411                 # If this is another user's talk page, update newtalk
3412                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3413                 # load of user talk pages and piss people off, nor if it's a minor edit
3414                 # by a properly-flagged bot.
3415                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3416                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
3417                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3418                                 $other = User::newFromName( $shortTitle, false );
3419                                 if ( !$other ) {
3420                                         wfDebug( __METHOD__ . ": invalid username\n" );
3421                                 } elseif ( User::isIP( $shortTitle ) ) {
3422                                         // An anonymous user
3423                                         $other->setNewtalk( true );
3424                                 } elseif ( $other->isLoggedIn() ) {
3425                                         $other->setNewtalk( true );
3426                                 } else {
3427                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3428                                 }
3429                         }
3430                 }
3431
3432                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3433                         $wgMessageCache->replace( $shortTitle, $text );
3434                 }
3435
3436                 wfProfileOut( __METHOD__ );
3437         }
3438
3439         /**
3440          * Perform article updates on a special page creation.
3441          *
3442          * @param $rev Revision object
3443          *
3444          * @todo This is a shitty interface function. Kill it and replace the
3445          * other shitty functions like editUpdates and such so it's not needed
3446          * anymore.
3447          */
3448         public function createUpdates( $rev ) {
3449                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3450                 $this->mTotalAdjustment = 1;
3451                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3452                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3453         }
3454
3455         /**
3456          * Generate the navigation links when browsing through an article revisions
3457          * It shows the information as:
3458          *   Revision as of \<date\>; view current revision
3459          *   \<- Previous version | Next Version -\>
3460          *
3461          * @param $oldid String: revision ID of this article revision
3462          */
3463         public function setOldSubtitle( $oldid = 0 ) {
3464                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3465
3466                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3467                         return;
3468                 }
3469
3470                 $unhide = $wgRequest->getInt( 'unhide' ) == 1 &&
3471                         $wgUser->matchEditToken( $wgRequest->getVal( 'token' ), $oldid );
3472                 # Cascade unhide param in links for easy deletion browsing
3473                 $extraParams = array();
3474                 if ( $wgRequest->getVal( 'unhide' ) ) {
3475                         $extraParams['unhide'] = 1;
3476                 }
3477                 $revision = Revision::newFromId( $oldid );
3478
3479                 $current = ( $oldid == $this->mLatest );
3480                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3481                 $tddate = $wgLang->date( $this->mTimestamp, true );
3482                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3483                 $sk = $wgUser->getSkin();
3484                 $lnk = $current
3485                         ? wfMsgHtml( 'currentrevisionlink' )
3486                         : $sk->link(
3487                                 $this->mTitle,
3488                                 wfMsgHtml( 'currentrevisionlink' ),
3489                                 array(),
3490                                 $extraParams,
3491                                 array( 'known', 'noclasses' )
3492                         );
3493                 $curdiff = $current
3494                         ? wfMsgHtml( 'diff' )
3495                         : $sk->link(
3496                                 $this->mTitle,
3497                                 wfMsgHtml( 'diff' ),
3498                                 array(),
3499                                 array(
3500                                         'diff' => 'cur',
3501                                         'oldid' => $oldid
3502                                 ) + $extraParams,
3503                                 array( 'known', 'noclasses' )
3504                         );
3505                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3506                 $prevlink = $prev
3507                         ? $sk->link(
3508                                 $this->mTitle,
3509                                 wfMsgHtml( 'previousrevision' ),
3510                                 array(),
3511                                 array(
3512                                         'direction' => 'prev',
3513                                         'oldid' => $oldid
3514                                 ) + $extraParams,
3515                                 array( 'known', 'noclasses' )
3516                         )
3517                         : wfMsgHtml( 'previousrevision' );
3518                 $prevdiff = $prev
3519                         ? $sk->link(
3520                                 $this->mTitle,
3521                                 wfMsgHtml( 'diff' ),
3522                                 array(),
3523                                 array(
3524                                         'diff' => 'prev',
3525                                         'oldid' => $oldid
3526                                 ) + $extraParams,
3527                                 array( 'known', 'noclasses' )
3528                         )
3529                         : wfMsgHtml( 'diff' );
3530                 $nextlink = $current
3531                         ? wfMsgHtml( 'nextrevision' )
3532                         : $sk->link(
3533                                 $this->mTitle,
3534                                 wfMsgHtml( 'nextrevision' ),
3535                                 array(),
3536                                 array(
3537                                         'direction' => 'next',
3538                                         'oldid' => $oldid
3539                                 ) + $extraParams,
3540                                 array( 'known', 'noclasses' )
3541                         );
3542                 $nextdiff = $current
3543                         ? wfMsgHtml( 'diff' )
3544                         : $sk->link(
3545                                 $this->mTitle,
3546                                 wfMsgHtml( 'diff' ),
3547                                 array(),
3548                                 array(
3549                                         'diff' => 'next',
3550                                         'oldid' => $oldid
3551                                 ) + $extraParams,
3552                                 array( 'known', 'noclasses' )
3553                         );
3554
3555                 $cdel = '';
3556                 // User can delete revisions or view deleted revisions...
3557                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3558                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3559                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3560                                 $cdel = $sk->revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3561                         } else {
3562                                 $query = array(
3563                                         'type'   => 'revision',
3564                                         'target' => $this->mTitle->getPrefixedDbkey(),
3565                                         'ids'    => $oldid
3566                                 );
3567                                 $cdel = $sk->revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3568                         }
3569                         $cdel .= ' ';
3570                 }
3571
3572                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3573                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3574
3575                 $m = wfMsg( 'revision-info-current' );
3576                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3577                         ? 'revision-info-current'
3578                         : 'revision-info';
3579
3580                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3581                         wfMsgExt(
3582                                 $infomsg,
3583                                 array( 'parseinline', 'replaceafter' ),
3584                                 $td,
3585                                 $userlinks,
3586                                 $revision->getID(),
3587                                 $tddate,
3588                                 $tdtime,
3589                                 $revision->getUser()
3590                         ) .
3591                         "</div>\n" .
3592                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3593                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3594                 $wgOut->setSubtitle( $r );
3595         }
3596
3597         /**
3598          * This function is called right before saving the wikitext,
3599          * so we can do things like signatures and links-in-context.
3600          *
3601          * @param $text String article contents
3602          * @return string article contents with altered wikitext markup (signatures
3603          *      converted, {{subst:}}, templates, etc.)
3604          */
3605         public function preSaveTransform( $text ) {
3606                 global $wgParser, $wgUser;
3607                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3608         }
3609
3610         /* Caching functions */
3611
3612         /**
3613          * checkLastModified returns true if it has taken care of all
3614          * output to the client that is necessary for this request.
3615          * (that is, it has sent a cached version of the page)
3616          *
3617          * @return boolean true if cached version send, false otherwise
3618          */
3619         protected function tryFileCache() {
3620                 static $called = false;
3621                 if ( $called ) {
3622                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3623                         return false;
3624                 }
3625                 $called = true;
3626                 if ( $this->isFileCacheable() ) {
3627                         $cache = new HTMLFileCache( $this->mTitle );
3628                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3629                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3630                                 $cache->loadFromFileCache();
3631                                 return true;
3632                         } else {
3633                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3634                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3635                         }
3636                 } else {
3637                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3638                 }
3639                 return false;
3640         }
3641
3642         /**
3643          * Check if the page can be cached
3644          * @return bool
3645          */
3646         public function isFileCacheable() {
3647                 $cacheable = false;
3648                 if ( HTMLFileCache::useFileCache() ) {
3649                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3650                         // Extension may have reason to disable file caching on some pages.
3651                         if ( $cacheable ) {
3652                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3653                         }
3654                 }
3655                 return $cacheable;
3656         }
3657
3658         /**
3659          * Loads page_touched and returns a value indicating if it should be used
3660          * @return boolean true if not a redirect
3661          */
3662         public function checkTouched() {
3663                 if ( !$this->mDataLoaded ) {
3664                         $this->loadPageData();
3665                 }
3666                 return !$this->mIsRedirect;
3667         }
3668
3669         /**
3670          * Get the page_touched field
3671          * @return string containing GMT timestamp
3672          */
3673         public function getTouched() {
3674                 # Ensure that page data has been loaded
3675                 if ( !$this->mDataLoaded ) {
3676                         $this->loadPageData();
3677                 }
3678                 return $this->mTouched;
3679         }
3680
3681         /**
3682          * Get the page_latest field
3683          * @return integer rev_id of current revision
3684          */
3685         public function getLatest() {
3686                 if ( !$this->mDataLoaded ) {
3687                         $this->loadPageData();
3688                 }
3689                 return (int)$this->mLatest;
3690         }
3691
3692         /**
3693          * Edit an article without doing all that other stuff
3694          * The article must already exist; link tables etc
3695          * are not updated, caches are not flushed.
3696          *
3697          * @param $text String: text submitted
3698          * @param $comment String: comment submitted
3699          * @param $minor Boolean: whereas it's a minor modification
3700          */
3701         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3702                 wfProfileIn( __METHOD__ );
3703
3704                 $dbw = wfGetDB( DB_MASTER );
3705                 $revision = new Revision( array(
3706                         'page'       => $this->getId(),
3707                         'text'       => $text,
3708                         'comment'    => $comment,
3709                         'minor_edit' => $minor ? 1 : 0,
3710                         ) );
3711                 $revision->insertOn( $dbw );
3712                 $this->updateRevisionOn( $dbw, $revision );
3713
3714                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
3715
3716                 wfProfileOut( __METHOD__ );
3717         }
3718
3719         /**
3720          * Used to increment the view counter
3721          *
3722          * @param $id Integer: article id
3723          */
3724         public static function incViewCount( $id ) {
3725                 $id = intval( $id );
3726                 global $wgHitcounterUpdateFreq;
3727
3728                 $dbw = wfGetDB( DB_MASTER );
3729                 $pageTable = $dbw->tableName( 'page' );
3730                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3731                 $acchitsTable = $dbw->tableName( 'acchits' );
3732
3733                 if ( $wgHitcounterUpdateFreq <= 1 ) {
3734                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3735                         return;
3736                 }
3737
3738                 # Not important enough to warrant an error page in case of failure
3739                 $oldignore = $dbw->ignoreErrors( true );
3740
3741                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3742
3743                 $checkfreq = intval( $wgHitcounterUpdateFreq / 25 + 1 );
3744                 if ( ( rand() % $checkfreq != 0 ) or ( $dbw->lastErrno() != 0 ) ) {
3745                         # Most of the time (or on SQL errors), skip row count check
3746                         $dbw->ignoreErrors( $oldignore );
3747                         return;
3748                 }
3749
3750                 $res = $dbw->query( "SELECT COUNT(*) as n FROM $hitcounterTable" );
3751                 $row = $dbw->fetchObject( $res );
3752                 $rown = intval( $row->n );
3753                 if ( $rown >= $wgHitcounterUpdateFreq ) {
3754                         wfProfileIn( 'Article::incViewCount-collect' );
3755                         $old_user_abort = ignore_user_abort( true );
3756
3757                         $dbType = $dbw->getType();
3758                         $dbw->lockTables( array(), array( 'hitcounter' ), __METHOD__, false );
3759                         $tabletype = $dbType == 'mysql' ? "ENGINE=HEAP " : '';
3760                         $dbw->query( "CREATE TEMPORARY TABLE $acchitsTable $tabletype AS " .
3761                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable " .
3762                                 'GROUP BY hc_id', __METHOD__ );
3763                         $dbw->delete( 'hitcounter', '*', __METHOD__ );
3764                         $dbw->unlockTables( __METHOD__ );
3765                         if ( $dbType == 'mysql' ) {
3766                                 $dbw->query( "UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n " .
3767                                         'WHERE page_id = hc_id', __METHOD__ );
3768                         }
3769                         else {
3770                                 $dbw->query( "UPDATE $pageTable SET page_counter=page_counter + hc_n " .
3771                                         "FROM $acchitsTable WHERE page_id = hc_id", __METHOD__ );
3772                         }
3773                         $dbw->query( "DROP TABLE $acchitsTable", __METHOD__ );
3774
3775                         ignore_user_abort( $old_user_abort );
3776                         wfProfileOut( 'Article::incViewCount-collect' );
3777                 }
3778                 $dbw->ignoreErrors( $oldignore );
3779         }
3780
3781         /**#@+
3782          * The onArticle*() functions are supposed to be a kind of hooks
3783          * which should be called whenever any of the specified actions
3784          * are done.
3785          *
3786          * This is a good place to put code to clear caches, for instance.
3787          *
3788          * This is called on page move and undelete, as well as edit
3789          *
3790          * @param $title a title object
3791          */
3792         public static function onArticleCreate( $title ) {
3793                 # Update existence markers on article/talk tabs...
3794                 if ( $title->isTalkPage() ) {
3795                         $other = $title->getSubjectPage();
3796                 } else {
3797                         $other = $title->getTalkPage();
3798                 }
3799                 $other->invalidateCache();
3800                 $other->purgeSquid();
3801
3802                 $title->touchLinks();
3803                 $title->purgeSquid();
3804                 $title->deleteTitleProtection();
3805         }
3806
3807         /**
3808          * Clears caches when article is deleted
3809          */
3810         public static function onArticleDelete( $title ) {
3811                 global $wgMessageCache;
3812                 # Update existence markers on article/talk tabs...
3813                 if ( $title->isTalkPage() ) {
3814                         $other = $title->getSubjectPage();
3815                 } else {
3816                         $other = $title->getTalkPage();
3817                 }
3818                 $other->invalidateCache();
3819                 $other->purgeSquid();
3820
3821                 $title->touchLinks();
3822                 $title->purgeSquid();
3823
3824                 # File cache
3825                 HTMLFileCache::clearFileCache( $title );
3826
3827                 # Messages
3828                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3829                         $wgMessageCache->replace( $title->getDBkey(), false );
3830                 }
3831                 # Images
3832                 if ( $title->getNamespace() == NS_FILE ) {
3833                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3834                         $update->doUpdate();
3835                 }
3836                 # User talk pages
3837                 if ( $title->getNamespace() == NS_USER_TALK ) {
3838                         $user = User::newFromName( $title->getText(), false );
3839                         $user->setNewtalk( false );
3840                 }
3841                 # Image redirects
3842                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3843         }
3844
3845         /**
3846          * Purge caches on page update etc
3847          *
3848          * @param $title Title object
3849          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
3850          */
3851         public static function onArticleEdit( $title ) {
3852                 global $wgDeferredUpdateList;
3853
3854                 // Invalidate caches of articles which include this page
3855                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3856
3857                 // Invalidate the caches of all pages which redirect here
3858                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3859
3860                 # Purge squid for this page only
3861                 $title->purgeSquid();
3862
3863                 # Clear file cache for this page only
3864                 HTMLFileCache::clearFileCache( $title );
3865         }
3866
3867         /**#@-*/
3868
3869         /**
3870          * Overriden by ImagePage class, only present here to avoid a fatal error
3871          * Called for ?action=revert
3872          */
3873         public function revert() {
3874                 global $wgOut;
3875                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3876         }
3877
3878         /**
3879          * Info about this page
3880          * Called for ?action=info when $wgAllowPageInfo is on.
3881          */
3882         public function info() {
3883                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3884
3885                 if ( !$wgAllowPageInfo ) {
3886                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3887                         return;
3888                 }
3889
3890                 $page = $this->mTitle->getSubjectPage();
3891
3892                 $wgOut->setPagetitle( $page->getPrefixedText() );
3893                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3894                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3895
3896                 if ( !$this->mTitle->exists() ) {
3897                         $wgOut->addHTML( '<div class="noarticletext">' );
3898                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3899                                 // This doesn't quite make sense; the user is asking for
3900                                 // information about the _page_, not the message... -- RC
3901                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3902                         } else {
3903                                 $msg = $wgUser->isLoggedIn()
3904                                         ? 'noarticletext'
3905                                         : 'noarticletextanon';
3906                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3907                         }
3908                         $wgOut->addHTML( '</div>' );
3909                 } else {
3910                         $dbr = wfGetDB( DB_SLAVE );
3911                         $wl_clause = array(
3912                                 'wl_title'     => $page->getDBkey(),
3913                                 'wl_namespace' => $page->getNamespace() );
3914                         $numwatchers = $dbr->selectField(
3915                                 'watchlist',
3916                                 'COUNT(*)',
3917                                 $wl_clause,
3918                                 __METHOD__,
3919                                 $this->getSelectOptions() );
3920
3921                         $pageInfo = $this->pageCountInfo( $page );
3922                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3923
3924                         $wgOut->addHTML( "<ul><li>" . wfMsg( "numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3925                         $wgOut->addHTML( "<li>" . wfMsg( 'numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>' );
3926                         if ( $talkInfo ) {
3927                                 $wgOut->addHTML( '<li>' . wfMsg( "numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>' );
3928                         }
3929                         $wgOut->addHTML( '<li>' . wfMsg( "numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3930                         if ( $talkInfo ) {
3931                                 $wgOut->addHTML( '<li>' . wfMsg( 'numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3932                         }
3933                         $wgOut->addHTML( '</ul>' );
3934                 }
3935         }
3936
3937         /**
3938          * Return the total number of edits and number of unique editors
3939          * on a given page. If page does not exist, returns false.
3940          *
3941          * @param $title Title object
3942          * @return mixed array or boolean false
3943          */
3944         public function pageCountInfo( $title ) {
3945                 $id = $title->getArticleId();
3946                 if ( $id == 0 ) {
3947                         return false;
3948                 }
3949                 $dbr = wfGetDB( DB_SLAVE );
3950                 $rev_clause = array( 'rev_page' => $id );
3951                 $edits = $dbr->selectField(
3952                         'revision',
3953                         'COUNT(rev_page)',
3954                         $rev_clause,
3955                         __METHOD__,
3956                         $this->getSelectOptions()
3957                 );
3958                 $authors = $dbr->selectField(
3959                         'revision',
3960                         'COUNT(DISTINCT rev_user_text)',
3961                         $rev_clause,
3962                         __METHOD__,
3963                         $this->getSelectOptions()
3964                 );
3965                 return array( 'edits' => $edits, 'authors' => $authors );
3966         }
3967
3968         /**
3969          * Return a list of templates used by this article.
3970          * Uses the templatelinks table
3971          *
3972          * @return Array of Title objects
3973          */
3974         public function getUsedTemplates() {
3975                 $result = array();
3976                 $id = $this->mTitle->getArticleID();
3977                 if ( $id == 0 ) {
3978                         return array();
3979                 }
3980                 $dbr = wfGetDB( DB_SLAVE );
3981                 $res = $dbr->select( array( 'templatelinks' ),
3982                         array( 'tl_namespace', 'tl_title' ),
3983                         array( 'tl_from' => $id ),
3984                         __METHOD__ );
3985                 if ( $res !== false ) {
3986                         foreach ( $res as $row ) {
3987                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3988                         }
3989                 }
3990                 $dbr->freeResult( $res );
3991                 return $result;
3992         }
3993
3994         /**
3995          * Returns a list of hidden categories this page is a member of.
3996          * Uses the page_props and categorylinks tables.
3997          *
3998          * @return Array of Title objects
3999          */
4000         public function getHiddenCategories() {
4001                 $result = array();
4002                 $id = $this->mTitle->getArticleID();
4003                 if ( $id == 0 ) {
4004                         return array();
4005                 }
4006                 $dbr = wfGetDB( DB_SLAVE );
4007                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
4008                         array( 'cl_to' ),
4009                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
4010                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
4011                         __METHOD__ );
4012                 if ( $res !== false ) {
4013                         foreach ( $res as $row ) {
4014                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
4015                         }
4016                 }
4017                 $dbr->freeResult( $res );
4018                 return $result;
4019         }
4020
4021         /**
4022         * Return an applicable autosummary if one exists for the given edit.
4023         * @param $oldtext String: the previous text of the page.
4024         * @param $newtext String: The submitted text of the page.
4025         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
4026         * @return string An appropriate autosummary, or an empty string.
4027         */
4028         public static function getAutosummary( $oldtext, $newtext, $flags ) {
4029                 # Decide what kind of autosummary is needed.
4030
4031                 # Redirect autosummaries
4032                 $ot = Title::newFromRedirect( $oldtext );
4033                 $rt = Title::newFromRedirect( $newtext );
4034                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
4035                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
4036                 }
4037
4038                 # New page autosummaries
4039                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
4040                         # If they're making a new article, give its text, truncated, in the summary.
4041                         global $wgContLang;
4042                         $truncatedtext = $wgContLang->truncate(
4043                                 str_replace( "\n", ' ', $newtext ),
4044                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
4045                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
4046                 }
4047
4048                 # Blanking autosummaries
4049                 if ( $oldtext != '' && $newtext == '' ) {
4050                         return wfMsgForContent( 'autosumm-blank' );
4051                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
4052                         # Removing more than 90% of the article
4053                         global $wgContLang;
4054                         $truncatedtext = $wgContLang->truncate(
4055                                 $newtext,
4056                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
4057                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
4058                 }
4059
4060                 # If we reach this point, there's no applicable autosummary for our case, so our
4061                 # autosummary is empty.
4062                 return '';
4063         }
4064
4065         /**
4066          * Add the primary page-view wikitext to the output buffer
4067          * Saves the text into the parser cache if possible.
4068          * Updates templatelinks if it is out of date.
4069          *
4070          * @param $text String
4071          * @param $cache Boolean
4072          * @param $parserOptions mixed ParserOptions object, or boolean false
4073          */
4074         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
4075                 global $wgOut;
4076
4077                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
4078                 $wgOut->addParserOutput( $this->mParserOutput );
4079         }
4080
4081         /**
4082          * This does all the heavy lifting for outputWikitext, except it returns the parser
4083          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
4084          * say, embedding thread pages within a discussion system (LiquidThreads)
4085          *
4086          * @param $text string
4087          * @param $cache boolean
4088          * @param $parserOptions parsing options, defaults to false
4089          * @return string containing parsed output
4090          */
4091         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
4092                 global $wgParser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
4093
4094                 if ( !$parserOptions ) {
4095                         $parserOptions = $this->getParserOptions();
4096                 }
4097
4098                 $time = - wfTime();
4099                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
4100                         $parserOptions, true, true, $this->getRevIdFetched() );
4101                 $time += wfTime();
4102
4103                 # Timing hack
4104                 if ( $time > 3 ) {
4105                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
4106                                 $this->mTitle->getPrefixedDBkey() ) );
4107                 }
4108
4109                 if ( $wgEnableParserCache && $cache && $this && $this->mParserOutput->getCacheTime() != -1 ) {
4110                         $parserCache = ParserCache::singleton();
4111                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
4112                 }
4113                 // Make sure file cache is not used on uncacheable content.
4114                 // Output that has magic words in it can still use the parser cache
4115                 // (if enabled), though it will generally expire sooner.
4116                 if ( $this->mParserOutput->getCacheTime() == -1 || $this->mParserOutput->containsOldMagic() ) {
4117                         $wgUseFileCache = false;
4118                 }
4119                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4120                 return $this->mParserOutput;
4121         }
4122
4123         /**
4124          * Get parser options suitable for rendering the primary article wikitext
4125          * @return mixed ParserOptions object or boolean false
4126          */
4127         public function getParserOptions() {
4128                 global $wgUser;
4129                 if ( !$this->mParserOptions ) {
4130                         $this->mParserOptions = new ParserOptions( $wgUser );
4131                         $this->mParserOptions->setTidy( true );
4132                         $this->mParserOptions->enableLimitReport();
4133                 }
4134                 return $this->mParserOptions;
4135         }
4136
4137         /**
4138          * Updates cascading protections
4139          *
4140          * @param $parserOutput mixed ParserOptions object, or boolean false
4141          **/
4142
4143         protected function doCascadeProtectionUpdates( $parserOutput ) {
4144                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4145                         return;
4146                 }
4147
4148                 // templatelinks table may have become out of sync,
4149                 // especially if using variable-based transclusions.
4150                 // For paranoia, check if things have changed and if
4151                 // so apply updates to the database. This will ensure
4152                 // that cascaded protections apply as soon as the changes
4153                 // are visible.
4154
4155                 # Get templates from templatelinks
4156                 $id = $this->mTitle->getArticleID();
4157
4158                 $tlTemplates = array();
4159
4160                 $dbr = wfGetDB( DB_SLAVE );
4161                 $res = $dbr->select( array( 'templatelinks' ),
4162                         array( 'tl_namespace', 'tl_title' ),
4163                         array( 'tl_from' => $id ),
4164                         __METHOD__ );
4165
4166                 global $wgContLang;
4167                 foreach ( $res as $row ) {
4168                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4169                 }
4170
4171                 # Get templates from parser output.
4172                 $poTemplates = array();
4173                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4174                         foreach ( $templates as $dbk => $id ) {
4175                                 $poTemplates["$ns:$dbk"] = true;
4176                         }
4177                 }
4178
4179                 # Get the diff
4180                 # Note that we simulate array_diff_key in PHP <5.0.x
4181                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4182
4183                 if ( count( $templates_diff ) > 0 ) {
4184                         # Whee, link updates time.
4185                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4186                         $u->doUpdate();
4187                 }
4188         }
4189
4190         /**
4191          * Update all the appropriate counts in the category table, given that
4192          * we've added the categories $added and deleted the categories $deleted.
4193          *
4194          * @param $added array   The names of categories that were added
4195          * @param $deleted array The names of categories that were deleted
4196          */
4197         public function updateCategoryCounts( $added, $deleted ) {
4198                 $ns = $this->mTitle->getNamespace();
4199                 $dbw = wfGetDB( DB_MASTER );
4200
4201                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4202                 # exist, we might legitimately not create it, but it's simpler to just
4203                 # create it and then give it a negative value, since the value is bogus
4204                 # anyway.
4205                 #
4206                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4207                 $insertCats = array_merge( $added, $deleted );
4208                 if ( !$insertCats ) {
4209                         # Okay, nothing to do
4210                         return;
4211                 }
4212                 $insertRows = array();
4213                 foreach ( $insertCats as $cat ) {
4214                         $insertRows[] = array(
4215                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
4216                                 'cat_title' => $cat
4217                         );
4218                 }
4219                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4220
4221                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4222                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4223                 if ( $ns == NS_CATEGORY ) {
4224                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4225                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4226                 } elseif ( $ns == NS_FILE ) {
4227                         $addFields[]    = 'cat_files = cat_files + 1';
4228                         $removeFields[] = 'cat_files = cat_files - 1';
4229                 }
4230
4231                 if ( $added ) {
4232                         $dbw->update(
4233                                 'category',
4234                                 $addFields,
4235                                 array( 'cat_title' => $added ),
4236                                 __METHOD__
4237                         );
4238                 }
4239                 if ( $deleted ) {
4240                         $dbw->update(
4241                                 'category',
4242                                 $removeFields,
4243                                 array( 'cat_title' => $deleted ),
4244                                 __METHOD__
4245                         );
4246                 }
4247         }
4248
4249         /**
4250          * Lightweight method to get the parser output for a page, checking the parser cache
4251          * and so on. Doesn't consider most of the stuff that Article::view is forced to
4252          * consider, so it's not appropriate to use there.
4253          *
4254          * @param $oldid mixed integer Revision ID or null
4255          */
4256         public function getParserOutput( $oldid = null ) {
4257                 global $wgEnableParserCache, $wgUser, $wgOut;
4258
4259                 // Should the parser cache be used?
4260                 $useParserCache = $wgEnableParserCache &&
4261                           intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
4262                           $this->exists() &&
4263                           $oldid === null;
4264
4265                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4266                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
4267                         wfIncrStats( 'pcache_miss_stub' );
4268                 }
4269
4270                 $parserOutput = false;
4271                 if ( $useParserCache ) {
4272                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4273                 }
4274
4275                 if ( $parserOutput === false ) {
4276                         // Cache miss; parse and output it.
4277                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4278
4279                         return $this->getOutputFromWikitext( $rev->getText(), $useParserCache );
4280                 } else {
4281                         return $parserOutput;
4282                 }
4283         }
4284 }