includes/WikiPage.php

   1 <?php
   2 /**
   3  * Base representation for a MediaWiki page.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Abstract class for type hinting (accepts WikiPage, Article, ImagePage, CategoryPage)
  25  */
  26 abstract class Page {}
  27
  28 /**
  29  * Class representing a MediaWiki article and history.
  30  *
  31  * Some fields are public only for backwards-compatibility. Use accessors.
  32  * In the past, this class was part of Article.php and everything was public.
  33  *
  34  * @internal documentation reviewed 15 Mar 2010
  35  */
  36 class WikiPage extends Page implements IDBAccessObject {
  37         // Constants for $mDataLoadedFrom and related
  38
  39         /**
  40          * @var Title
  41          */
  42         public $mTitle = null;
  43
  44         /**@{{
  45          * @protected
  46          */
  47         public $mDataLoaded = false;         // !< Boolean
  48         public $mIsRedirect = false;         // !< Boolean
  49         public $mLatest = false;             // !< Integer (false means "not loaded")
  50         public $mPreparedEdit = false;       // !< Array
  51         /**@}}*/
  52
  53         /**
  54          * @var int; one of the READ_* constants
  55          */
  56         protected $mDataLoadedFrom = self::READ_NONE;
  57
  58         /**
  59          * @var Title
  60          */
  61         protected $mRedirectTarget = null;
  62
  63         /**
  64          * @var Revision
  65          */
  66         protected $mLastRevision = null;
  67
  68         /**
  69          * @var string; timestamp of the current revision or empty string if not loaded
  70          */
  71         protected $mTimestamp = '';
  72
  73         /**
  74          * @var string
  75          */
  76         protected $mTouched = '19700101000000';
  77
  78         /**
  79          * @var int|null
  80          */
  81         protected $mCounter = null;
  82
  83         /**
  84          * Constructor and clear the article
  85          * @param $title Title Reference to a Title object.
  86          */
  87         public function __construct( Title $title ) {
  88                 $this->mTitle = $title;
  89         }
  90
  91         /**
  92          * Create a WikiPage object of the appropriate class for the given title.
  93          *
  94          * @param $title Title
  95          * @return WikiPage object of the appropriate type
  96          */
  97         public static function factory( Title $title ) {
  98                 $ns = $title->getNamespace();
  99
 100                 if ( $ns == NS_MEDIA ) {
 101                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 102                 } elseif ( $ns < 0 ) {
 103                         throw new MWException( "Invalid or virtual namespace $ns given." );
 104                 }
 105
 106                 switch ( $ns ) {
 107                         case NS_FILE:
 108                                 $page = new WikiFilePage( $title );
 109                                 break;
 110                         case NS_CATEGORY:
 111                                 $page = new WikiCategoryPage( $title );
 112                                 break;
 113                         default:
 114                                 $page = new WikiPage( $title );
 115                 }
 116
 117                 return $page;
 118         }
 119
 120         /**
 121          * Constructor from a page id
 122          *
 123          * @param $id Int article ID to load
 124          * @param $from string|int one of the following values:
 125          *        - "fromdb" or WikiPage::READ_NORMAL to select from a slave database
 126          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 127          *
 128          * @return WikiPage|null
 129          */
 130         public static function newFromID( $id, $from = 'fromdb' ) {
 131                 $from = self::convertSelectType( $from );
 132                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_SLAVE );
 133                 $row = $db->selectRow( 'page', self::selectFields(), array( 'page_id' => $id ), __METHOD__ );
 134                 if ( !$row ) {
 135                         return null;
 136                 }
 137                 return self::newFromRow( $row, $from );
 138         }
 139
 140         /**
 141          * Constructor from a database row
 142          *
 143          * @since 1.20
 144          * @param $row object: database row containing at least fields returned
 145          *        by selectFields().
 146          * @param $from string|int: source of $data:
 147          *        - "fromdb" or WikiPage::READ_NORMAL: from a slave DB
 148          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 149          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 150          * @return WikiPage
 151          */
 152         public static function newFromRow( $row, $from = 'fromdb' ) {
 153                 $page = self::factory( Title::newFromRow( $row ) );
 154                 $page->loadFromRow( $row, $from );
 155                 return $page;
 156         }
 157
 158         /**
 159          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 160          *
 161          * @param $type object|string|int
 162          * @return mixed
 163          */
 164         private static function convertSelectType( $type ) {
 165                 switch ( $type ) {
 166                 case 'fromdb':
 167                         return self::READ_NORMAL;
 168                 case 'fromdbmaster':
 169                         return self::READ_LATEST;
 170                 case 'forupdate':
 171                         return self::READ_LOCKING;
 172                 default:
 173                         // It may already be an integer or whatever else
 174                         return $type;
 175                 }
 176         }
 177
 178         /**
 179          * Returns overrides for action handlers.
 180          * Classes listed here will be used instead of the default one when
 181          * (and only when) $wgActions[$action] === true. This allows subclasses
 182          * to override the default behavior.
 183          *
 184          * @todo: move this UI stuff somewhere else
 185          *
 186          * @return Array
 187          */
 188         public function getActionOverrides() {
 189                 $content_handler = $this->getContentHandler();
 190                 return $content_handler->getActionOverrides();
 191         }
 192
 193         /**
 194          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 195          *
 196          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 197          *
 198          * @return ContentHandler
 199          *
 200          * @since 1.WD
 201          */
 202         public function getContentHandler() {
 203                 return ContentHandler::getForModelID( $this->getContentModel() );
 204         }
 205
 206         /**
 207          * Get the title object of the article
 208          * @return Title object of this page
 209          */
 210         public function getTitle() {
 211                 return $this->mTitle;
 212         }
 213
 214         /**
 215          * Clear the object
 216          * @return void
 217          */
 218         public function clear() {
 219                 $this->mDataLoaded = false;
 220                 $this->mDataLoadedFrom = self::READ_NONE;
 221
 222                 $this->clearCacheFields();
 223         }
 224
 225         /**
 226          * Clear the object cache fields
 227          * @return void
 228          */
 229         protected function clearCacheFields() {
 230                 $this->mCounter = null;
 231                 $this->mRedirectTarget = null; # Title object if set
 232                 $this->mLastRevision = null; # Latest revision
 233                 $this->mTouched = '19700101000000';
 234                 $this->mTimestamp = '';
 235                 $this->mIsRedirect = false;
 236                 $this->mLatest = false;
 237                 $this->mPreparedEdit = false;
 238         }
 239
 240         /**
 241          * Return the list of revision fields that should be selected to create
 242          * a new page.
 243          *
 244          * @return array
 245          */
 246         public static function selectFields() {
 247                 global $wgContentHandlerUseDB;
 248
 249                 $fields = array(
 250                         'page_id',
 251                         'page_namespace',
 252                         'page_title',
 253                         'page_restrictions',
 254                         'page_counter',
 255                         'page_is_redirect',
 256                         'page_is_new',
 257                         'page_random',
 258                         'page_touched',
 259                         'page_latest',
 260                         'page_len',
 261                 );
 262
 263                 if ( $wgContentHandlerUseDB ) {
 264                         $fields[] = 'page_content_model';
 265                 }
 266
 267                 return $fields;
 268         }
 269
 270         /**
 271          * Fetch a page record with the given conditions
 272          * @param $dbr DatabaseBase object
 273          * @param $conditions Array
 274          * @param $options Array
 275          * @return mixed Database result resource, or false on failure
 276          */
 277         protected function pageData( $dbr, $conditions, $options = array() ) {
 278                 $fields = self::selectFields();
 279
 280                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 281
 282                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 283
 284                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 285
 286                 return $row;
 287         }
 288
 289         /**
 290          * Fetch a page record matching the Title object's namespace and title
 291          * using a sanitized title string
 292          *
 293          * @param $dbr DatabaseBase object
 294          * @param $title Title object
 295          * @param $options Array
 296          * @return mixed Database result resource, or false on failure
 297          */
 298         public function pageDataFromTitle( $dbr, $title, $options = array() ) {
 299                 return $this->pageData( $dbr, array(
 300                         'page_namespace' => $title->getNamespace(),
 301                         'page_title'     => $title->getDBkey() ), $options );
 302         }
 303
 304         /**
 305          * Fetch a page record matching the requested ID
 306          *
 307          * @param $dbr DatabaseBase
 308          * @param $id Integer
 309          * @param $options Array
 310          * @return mixed Database result resource, or false on failure
 311          */
 312         public function pageDataFromId( $dbr, $id, $options = array() ) {
 313                 return $this->pageData( $dbr, array( 'page_id' => $id ), $options );
 314         }
 315
 316         /**
 317          * Set the general counter, title etc data loaded from
 318          * some source.
 319          *
 320          * @param $from object|string|int One of the following:
 321          *        - A DB query result object
 322          *        - "fromdb" or WikiPage::READ_NORMAL to get from a slave DB
 323          *        - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB
 324          *        - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB using SELECT FOR UPDATE
 325          *
 326          * @return void
 327          */
 328         public function loadPageData( $from = 'fromdb' ) {
 329                 $from = self::convertSelectType( $from );
 330                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 331                         // We already have the data from the correct location, no need to load it twice.
 332                         return;
 333                 }
 334
 335                 if ( $from === self::READ_LOCKING ) {
 336                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle, array( 'FOR UPDATE' ) );
 337                 } elseif ( $from === self::READ_LATEST ) {
 338                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 339                 } elseif ( $from === self::READ_NORMAL ) {
 340                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 341                         # Use a "last rev inserted" timestamp key to dimish the issue of slave lag.
 342                         # Note that DB also stores the master position in the session and checks it.
 343                         $touched = $this->getCachedLastEditTime();
 344                         if ( $touched ) { // key set
 345                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 346                                         $from = self::READ_LATEST;
 347                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 348                                 }
 349                         }
 350                 } else {
 351                         // No idea from where the caller got this data, assume slave database.
 352                         $data = $from;
 353                         $from = self::READ_NORMAL;
 354                 }
 355
 356                 $this->loadFromRow( $data, $from );
 357         }
 358
 359         /**
 360          * Load the object from a database row
 361          *
 362          * @since 1.20
 363          * @param $data object: database row containing at least fields returned
 364          *        by selectFields()
 365          * @param $from string|int One of the following:
 366          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a slave DB
 367          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 368          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from from
 369          *          the master DB using SELECT FOR UPDATE
 370          */
 371         public function loadFromRow( $data, $from ) {
 372                 $lc = LinkCache::singleton();
 373
 374                 if ( $data ) {
 375                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 376
 377                         $this->mTitle->loadFromRow( $data );
 378
 379                         # Old-fashioned restrictions
 380                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 381
 382                         $this->mCounter     = intval( $data->page_counter );
 383                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 384                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 385                         $this->mLatest      = intval( $data->page_latest );
 386                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 387                         // Double-check the ID of any cached latest Revision object for consistency.
 388                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 389                                 $this->mLastRevision = null;
 390                                 $this->mTimestamp = '';
 391                         }
 392                 } else {
 393                         $lc->addBadLinkObj( $this->mTitle );
 394
 395                         $this->mTitle->loadFromRow( false );
 396
 397                         $this->clearCacheFields();
 398                 }
 399
 400                 $this->mDataLoaded = true;
 401                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 402         }
 403
 404         /**
 405          * @return int Page ID
 406          */
 407         public function getId() {
 408                 return $this->mTitle->getArticleID();
 409         }
 410
 411         /**
 412          * @return bool Whether or not the page exists in the database
 413          */
 414         public function exists() {
 415                 return $this->mTitle->exists();
 416         }
 417
 418         /**
 419          * Check if this page is something we're going to be showing
 420          * some sort of sensible content for. If we return false, page
 421          * views (plain action=view) will return an HTTP 404 response,
 422          * so spiders and robots can know they're following a bad link.
 423          *
 424          * @return bool
 425          */
 426         public function hasViewableContent() {
 427                 return $this->mTitle->exists() || $this->mTitle->isAlwaysKnown();
 428         }
 429
 430         /**
 431          * @return int The view count for the page
 432          */
 433         public function getCount() {
 434                 if ( !$this->mDataLoaded ) {
 435                         $this->loadPageData();
 436                 }
 437
 438                 return $this->mCounter;
 439         }
 440
 441         /**
 442          * Tests if the article content represents a redirect
 443          *
 444          * @return bool
 445          */
 446         public function isRedirect( ) {
 447                 $content = $this->getContent();
 448                 if ( !$content ) return false;
 449
 450                 return $content->isRedirect();
 451         }
 452
 453         /**
 454          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 455          *
 456          * Will use the revisions actual content model if the page exists,
 457          * and the page's default if the page doesn't exist yet.
 458          *
 459          * @return String
 460          *
 461          * @since 1.WD
 462          */
 463         public function getContentModel() {
 464                 if ( $this->exists() ) {
 465                         # look at the revision's actual content model
 466                         $rev = $this->getRevision();
 467
 468                         if ( $rev !== null ) {
 469                                 return $rev->getContentModel();
 470                         } else {
 471                                 $title = $this->mTitle->getPrefixedDBkey();
 472                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 473                         }
 474                 }
 475
 476                 # use the default model for this page
 477                 return $this->mTitle->getContentModel();
 478         }
 479
 480         /**
 481          * Loads page_touched and returns a value indicating if it should be used
 482          * @return boolean true if not a redirect
 483          */
 484         public function checkTouched() {
 485                 if ( !$this->mDataLoaded ) {
 486                         $this->loadPageData();
 487                 }
 488                 return !$this->mIsRedirect;
 489         }
 490
 491         /**
 492          * Get the page_touched field
 493          * @return string containing GMT timestamp
 494          */
 495         public function getTouched() {
 496                 if ( !$this->mDataLoaded ) {
 497                         $this->loadPageData();
 498                 }
 499                 return $this->mTouched;
 500         }
 501
 502         /**
 503          * Get the page_latest field
 504          * @return integer rev_id of current revision
 505          */
 506         public function getLatest() {
 507                 if ( !$this->mDataLoaded ) {
 508                         $this->loadPageData();
 509                 }
 510                 return (int)$this->mLatest;
 511         }
 512
 513         /**
 514          * Get the Revision object of the oldest revision
 515          * @return Revision|null
 516          */
 517         public function getOldestRevision() {
 518                 wfProfileIn( __METHOD__ );
 519
 520                 // Try using the slave database first, then try the master
 521                 $continue = 2;
 522                 $db = wfGetDB( DB_SLAVE );
 523                 $revSelectFields = Revision::selectFields();
 524
 525                 while ( $continue ) {
 526                         $row = $db->selectRow(
 527                                 array( 'page', 'revision' ),
 528                                 $revSelectFields,
 529                                 array(
 530                                         'page_namespace' => $this->mTitle->getNamespace(),
 531                                         'page_title' => $this->mTitle->getDBkey(),
 532                                         'rev_page = page_id'
 533                                 ),
 534                                 __METHOD__,
 535                                 array(
 536                                         'ORDER BY' => 'rev_timestamp ASC'
 537                                 )
 538                         );
 539
 540                         if ( $row ) {
 541                                 $continue = 0;
 542                         } else {
 543                                 $db = wfGetDB( DB_MASTER );
 544                                 $continue--;
 545                         }
 546                 }
 547
 548                 wfProfileOut( __METHOD__ );
 549                 return $row ? Revision::newFromRow( $row ) : null;
 550         }
 551
 552         /**
 553          * Loads everything except the text
 554          * This isn't necessary for all uses, so it's only done if needed.
 555          */
 556         protected function loadLastEdit() {
 557                 if ( $this->mLastRevision !== null ) {
 558                         return; // already loaded
 559                 }
 560
 561                 $latest = $this->getLatest();
 562                 if ( !$latest ) {
 563                         return; // page doesn't exist or is missing page_latest info
 564                 }
 565
 566                 // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always includes the
 567                 // latest changes committed. This is true even within REPEATABLE-READ transactions, where
 568                 // S1 normally only sees changes committed before the first S1 SELECT. Thus we need S1 to
 569                 // also gets the revision row FOR UPDATE; otherwise, it may not find it since a page row
 570                 // UPDATE and revision row INSERT by S2 may have happened after the first S1 SELECT.
 571                 // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read.
 572                 $flags = ( $this->mDataLoadedFrom == self::READ_LOCKING ) ? Revision::READ_LOCKING : 0;
 573                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 574                 if ( $revision ) { // sanity
 575                         $this->setLastEdit( $revision );
 576                 }
 577         }
 578
 579         /**
 580          * Set the latest revision
 581          */
 582         protected function setLastEdit( Revision $revision ) {
 583                 $this->mLastRevision = $revision;
 584                 $this->mTimestamp = $revision->getTimestamp();
 585         }
 586
 587         /**
 588          * Get the latest revision
 589          * @return Revision|null
 590          */
 591         public function getRevision() {
 592                 $this->loadLastEdit();
 593                 if ( $this->mLastRevision ) {
 594                         return $this->mLastRevision;
 595                 }
 596                 return null;
 597         }
 598
 599         /**
 600          * Get the content of the current revision. No side-effects...
 601          *
 602          * @param $audience Integer: one of:
 603          *      Revision::FOR_PUBLIC       to be displayed to all users
 604          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 605          *      Revision::RAW              get the text regardless of permissions
 606          * @return Content|null The content of the current revision
 607          *
 608          * @since 1.WD
 609          */
 610         public function getContent( $audience = Revision::FOR_PUBLIC ) {
 611                 $this->loadLastEdit();
 612                 if ( $this->mLastRevision ) {
 613                         return $this->mLastRevision->getContent( $audience );
 614                 }
 615                 return null;
 616         }
 617
 618         /**
 619          * Get the text of the current revision. No side-effects...
 620          *
 621          * @param $audience Integer: one of:
 622          *      Revision::FOR_PUBLIC       to be displayed to all users
 623          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 624          *      Revision::RAW              get the text regardless of permissions
 625          * @return String|false The text of the current revision
 626          * @deprecated as of 1.WD, getContent() should be used instead.
 627          */
 628         public function getText( $audience = Revision::FOR_PUBLIC ) { #@todo: deprecated, replace usage!
 629                 wfDeprecated( __METHOD__, '1.WD' );
 630
 631                 $this->loadLastEdit();
 632                 if ( $this->mLastRevision ) {
 633                         return $this->mLastRevision->getText( $audience );
 634                 }
 635                 return false;
 636         }
 637
 638         /**
 639          * Get the text of the current revision. No side-effects...
 640          *
 641          * @return String|bool The text of the current revision. False on failure
 642          * @deprecated as of 1.WD, getContent() should be used instead.
 643          */
 644         public function getRawText() {
 645                 wfDeprecated( __METHOD__, '1.WD' );
 646
 647                 return $this->getText( Revision::RAW );
 648         }
 649
 650         /**
 651          * @return string MW timestamp of last article revision
 652          */
 653         public function getTimestamp() {
 654                 // Check if the field has been filled by WikiPage::setTimestamp()
 655                 if ( !$this->mTimestamp ) {
 656                         $this->loadLastEdit();
 657                 }
 658
 659                 return wfTimestamp( TS_MW, $this->mTimestamp );
 660         }
 661
 662         /**
 663          * Set the page timestamp (use only to avoid DB queries)
 664          * @param $ts string MW timestamp of last article revision
 665          * @return void
 666          */
 667         public function setTimestamp( $ts ) {
 668                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 669         }
 670
 671         /**
 672          * @param $audience Integer: one of:
 673          *      Revision::FOR_PUBLIC       to be displayed to all users
 674          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 675          *      Revision::RAW              get the text regardless of permissions
 676          * @return int user ID for the user that made the last article revision
 677          */
 678         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 679                 $this->loadLastEdit();
 680                 if ( $this->mLastRevision ) {
 681                         return $this->mLastRevision->getUser( $audience );
 682                 } else {
 683                         return -1;
 684                 }
 685         }
 686
 687         /**
 688          * Get the User object of the user who created the page
 689          * @param $audience Integer: one of:
 690          *      Revision::FOR_PUBLIC       to be displayed to all users
 691          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 692          *      Revision::RAW              get the text regardless of permissions
 693          * @return User|null
 694          */
 695         public function getCreator( $audience = Revision::FOR_PUBLIC ) {
 696                 $revision = $this->getOldestRevision();
 697                 if ( $revision ) {
 698                         $userName = $revision->getUserText( $audience );
 699                         return User::newFromName( $userName, false );
 700                 } else {
 701                         return null;
 702                 }
 703         }
 704
 705         /**
 706          * @param $audience Integer: one of:
 707          *      Revision::FOR_PUBLIC       to be displayed to all users
 708          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 709          *      Revision::RAW              get the text regardless of permissions
 710          * @return string username of the user that made the last article revision
 711          */
 712         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 713                 $this->loadLastEdit();
 714                 if ( $this->mLastRevision ) {
 715                         return $this->mLastRevision->getUserText( $audience );
 716                 } else {
 717                         return '';
 718                 }
 719         }
 720
 721         /**
 722          * @param $audience Integer: one of:
 723          *      Revision::FOR_PUBLIC       to be displayed to all users
 724          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 725          *      Revision::RAW              get the text regardless of permissions
 726          * @return string Comment stored for the last article revision
 727          */
 728         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 729                 $this->loadLastEdit();
 730                 if ( $this->mLastRevision ) {
 731                         return $this->mLastRevision->getComment( $audience );
 732                 } else {
 733                         return '';
 734                 }
 735         }
 736
 737         /**
 738          * Returns true if last revision was marked as "minor edit"
 739          *
 740          * @return boolean Minor edit indicator for the last article revision.
 741          */
 742         public function getMinorEdit() {
 743                 $this->loadLastEdit();
 744                 if ( $this->mLastRevision ) {
 745                         return $this->mLastRevision->isMinor();
 746                 } else {
 747                         return false;
 748                 }
 749         }
 750
 751         /**
 752          * Get the cached timestamp for the last time the page changed.
 753          * This is only used to help handle slave lag by comparing to page_touched.
 754          * @return string MW timestamp
 755          */
 756         protected function getCachedLastEditTime() {
 757                 global $wgMemc;
 758                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 759                 return $wgMemc->get( $key );
 760         }
 761
 762         /**
 763          * Set the cached timestamp for the last time the page changed.
 764          * This is only used to help handle slave lag by comparing to page_touched.
 765          * @param $timestamp string
 766          * @return void
 767          */
 768         public function setCachedLastEditTime( $timestamp ) {
 769                 global $wgMemc;
 770                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 771                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 772         }
 773
 774         /**
 775          * Determine whether a page would be suitable for being counted as an
 776          * article in the site_stats table based on the title & its content
 777          *
 778          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 779          *        if false, the current database state will be used
 780          * @return Boolean
 781          */
 782         public function isCountable( $editInfo = false ) {
 783                 global $wgArticleCountMethod;
 784
 785                 if ( !$this->mTitle->isContentPage() ) {
 786                         return false;
 787                 }
 788
 789                 if ( $editInfo ) {
 790                         $content = $editInfo->pstContent;
 791                 } else {
 792                         $content = $this->getContent();
 793                 }
 794
 795                 if ( !$content || $content->isRedirect( ) ) {
 796                         return false;
 797                 }
 798
 799                 $hasLinks = null;
 800
 801                 if ( $wgArticleCountMethod === 'link' ) {
 802                         # nasty special case to avoid re-parsing to detect links
 803
 804                         if ( $editInfo ) {
 805                                 // ParserOutput::getLinks() is a 2D array of page links, so
 806                                 // to be really correct we would need to recurse in the array
 807                                 // but the main array should only have items in it if there are
 808                                 // links.
 809                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 810                         } else {
 811                                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 812                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 813                         }
 814                 }
 815
 816                 return $content->isCountable( $hasLinks );
 817         }
 818
 819         /**
 820          * If this page is a redirect, get its target
 821          *
 822          * The target will be fetched from the redirect table if possible.
 823          * If this page doesn't have an entry there, call insertRedirect()
 824          * @return Title|mixed object, or null if this page is not a redirect
 825          */
 826         public function getRedirectTarget() {
 827                 if ( !$this->mTitle->isRedirect() ) {
 828                         return null;
 829                 }
 830
 831                 if ( $this->mRedirectTarget !== null ) {
 832                         return $this->mRedirectTarget;
 833                 }
 834
 835                 # Query the redirect table
 836                 $dbr = wfGetDB( DB_SLAVE );
 837                 $row = $dbr->selectRow( 'redirect',
 838                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 839                         array( 'rd_from' => $this->getId() ),
 840                         __METHOD__
 841                 );
 842
 843                 // rd_fragment and rd_interwiki were added later, populate them if empty
 844                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 845                         return $this->mRedirectTarget = Title::makeTitle(
 846                                 $row->rd_namespace, $row->rd_title,
 847                                 $row->rd_fragment, $row->rd_interwiki );
 848                 }
 849
 850                 # This page doesn't have an entry in the redirect table
 851                 return $this->mRedirectTarget = $this->insertRedirect();
 852         }
 853
 854         /**
 855          * Insert an entry for this page into the redirect table.
 856          *
 857          * Don't call this function directly unless you know what you're doing.
 858          * @return Title object or null if not a redirect
 859          */
 860         public function insertRedirect() {
 861                 // recurse through to only get the final target
 862                 $content = $this->getContent();
 863                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 864                 if ( !$retval ) {
 865                         return null;
 866                 }
 867                 $this->insertRedirectEntry( $retval );
 868                 return $retval;
 869         }
 870
 871         /**
 872          * Insert or update the redirect table entry for this page to indicate
 873          * it redirects to $rt .
 874          * @param $rt Title redirect target
 875          */
 876         public function insertRedirectEntry( $rt ) {
 877                 $dbw = wfGetDB( DB_MASTER );
 878                 $dbw->replace( 'redirect', array( 'rd_from' ),
 879                         array(
 880                                 'rd_from'      => $this->getId(),
 881                                 'rd_namespace' => $rt->getNamespace(),
 882                                 'rd_title'     => $rt->getDBkey(),
 883                                 'rd_fragment'  => $rt->getFragment(),
 884                                 'rd_interwiki' => $rt->getInterwiki(),
 885                         ),
 886                         __METHOD__
 887                 );
 888         }
 889
 890         /**
 891          * Get the Title object or URL this page redirects to
 892          *
 893          * @return mixed false, Title of in-wiki target, or string with URL
 894          */
 895         public function followRedirect() {
 896                 return $this->getRedirectURL( $this->getRedirectTarget() );
 897         }
 898
 899         /**
 900          * Get the Title object or URL to use for a redirect. We use Title
 901          * objects for same-wiki, non-special redirects and URLs for everything
 902          * else.
 903          * @param $rt Title Redirect target
 904          * @return mixed false, Title object of local target, or string with URL
 905          */
 906         public function getRedirectURL( $rt ) {
 907                 if ( !$rt ) {
 908                         return false;
 909                 }
 910
 911                 if ( $rt->isExternal() ) {
 912                         if ( $rt->isLocal() ) {
 913                                 // Offsite wikis need an HTTP redirect.
 914                                 //
 915                                 // This can be hard to reverse and may produce loops,
 916                                 // so they may be disabled in the site configuration.
 917                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 918                                 return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 919                         } else {
 920                                 // External pages pages without "local" bit set are not valid
 921                                 // redirect targets
 922                                 return false;
 923                         }
 924                 }
 925
 926                 if ( $rt->isSpecialPage() ) {
 927                         // Gotta handle redirects to special pages differently:
 928                         // Fill the HTTP response "Location" header and ignore
 929                         // the rest of the page we're on.
 930                         //
 931                         // Some pages are not valid targets
 932                         if ( $rt->isValidRedirectTarget() ) {
 933                                 return $rt->getFullURL();
 934                         } else {
 935                                 return false;
 936                         }
 937                 }
 938
 939                 return $rt;
 940         }
 941
 942         /**
 943          * Get a list of users who have edited this article, not including the user who made
 944          * the most recent revision, which you can get from $article->getUser() if you want it
 945          * @return UserArrayFromResult
 946          */
 947         public function getContributors() {
 948                 # @todo FIXME: This is expensive; cache this info somewhere.
 949
 950                 $dbr = wfGetDB( DB_SLAVE );
 951
 952                 if ( $dbr->implicitGroupby() ) {
 953                         $realNameField = 'user_real_name';
 954                 } else {
 955                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 956                 }
 957
 958                 $tables = array( 'revision', 'user' );
 959
 960                 $fields = array(
 961                         'user_id' => 'rev_user',
 962                         'user_name' => 'rev_user_text',
 963                         $realNameField,
 964                         'timestamp' => 'MAX(rev_timestamp)',
 965                 );
 966
 967                 $conds = array( 'rev_page' => $this->getId() );
 968
 969                 // The user who made the top revision gets credited as "this page was last edited by
 970                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 971                 $user = $this->getUser();
 972                 if ( $user ) {
 973                         $conds[] = "rev_user != $user";
 974                 } else {
 975                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 976                 }
 977
 978                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 979
 980                 $jconds = array(
 981                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 982                 );
 983
 984                 $options = array(
 985                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 986                         'ORDER BY' => 'timestamp DESC',
 987                 );
 988
 989                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 990                 return new UserArrayFromResult( $res );
 991         }
 992
 993         /**
 994          * Get the last N authors
 995          * @param $num Integer: number of revisions to get
 996          * @param $revLatest String: the latest rev_id, selected from the master (optional)
 997          * @return array Array of authors, duplicates not removed
 998          */
 999         public function getLastNAuthors( $num, $revLatest = 0 ) {
1000                 wfProfileIn( __METHOD__ );
1001                 // First try the slave
1002                 // If that doesn't have the latest revision, try the master
1003                 $continue = 2;
1004                 $db = wfGetDB( DB_SLAVE );
1005
1006                 do {
1007                         $res = $db->select( array( 'page', 'revision' ),
1008                                 array( 'rev_id', 'rev_user_text' ),
1009                                 array(
1010                                         'page_namespace' => $this->mTitle->getNamespace(),
1011                                         'page_title' => $this->mTitle->getDBkey(),
1012                                         'rev_page = page_id'
1013                                 ), __METHOD__,
1014                                 array(
1015                                         'ORDER BY' => 'rev_timestamp DESC',
1016                                         'LIMIT' => $num
1017                                 )
1018                         );
1019
1020                         if ( !$res ) {
1021                                 wfProfileOut( __METHOD__ );
1022                                 return array();
1023                         }
1024
1025                         $row = $db->fetchObject( $res );
1026
1027                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1028                                 $db = wfGetDB( DB_MASTER );
1029                                 $continue--;
1030                         } else {
1031                                 $continue = 0;
1032                         }
1033                 } while ( $continue );
1034
1035                 $authors = array( $row->rev_user_text );
1036
1037                 foreach ( $res as $row ) {
1038                         $authors[] = $row->rev_user_text;
1039                 }
1040
1041                 wfProfileOut( __METHOD__ );
1042                 return $authors;
1043         }
1044
1045         /**
1046          * Should the parser cache be used?
1047          *
1048          * @param $parserOptions ParserOptions to check
1049          * @param $oldid int
1050          * @return boolean
1051          */
1052         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
1053                 global $wgEnableParserCache;
1054
1055                 return $wgEnableParserCache
1056                         && $parserOptions->getStubThreshold() == 0
1057                         && $this->mTitle->exists()
1058                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
1059                         && $this->getContentHandler()->isParserCacheSupported();
1060         }
1061
1062         /**
1063          * Get a ParserOutput for the given ParserOptions and revision ID.
1064          * The parser cache will be used if possible.
1065          *
1066          * @since 1.19
1067          * @param $parserOptions ParserOptions to use for the parse operation
1068          * @param $oldid Revision ID to get the text from, passing null or 0 will
1069          *               get the current revision (default value)
1070          *
1071          * @return ParserOutput or false if the revision was not found
1072          */
1073         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
1074                 wfProfileIn( __METHOD__ );
1075
1076                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
1077                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1078                 if ( $parserOptions->getStubThreshold() ) {
1079                         wfIncrStats( 'pcache_miss_stub' );
1080                 }
1081
1082                 if ( $useParserCache ) {
1083                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1084                         if ( $parserOutput !== false ) {
1085                                 wfProfileOut( __METHOD__ );
1086                                 return $parserOutput;
1087                         }
1088                 }
1089
1090                 if ( $oldid === null || $oldid === 0 ) {
1091                         $oldid = $this->getLatest();
1092                 }
1093
1094                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1095                 $pool->execute();
1096
1097                 wfProfileOut( __METHOD__ );
1098
1099                 return $pool->getParserOutput();
1100         }
1101
1102         /**
1103          * Do standard deferred updates after page view
1104          * @param $user User The relevant user
1105          */
1106         public function doViewUpdates( User $user ) {
1107                 global $wgDisableCounters;
1108                 if ( wfReadOnly() ) {
1109                         return;
1110                 }
1111
1112                 # Don't update page view counters on views from bot users (bug 14044)
1113                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->mTitle->exists() ) {
1114                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1115                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1116                 }
1117
1118                 # Update newtalk / watchlist notification status
1119                 $user->clearNotification( $this->mTitle );
1120         }
1121
1122         /**
1123          * Perform the actions of a page purging
1124          * @return bool
1125          */
1126         public function doPurge() {
1127                 global $wgUseSquid;
1128
1129                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
1130                         return false;
1131                 }
1132
1133                 // Invalidate the cache
1134                 $this->mTitle->invalidateCache();
1135                 $this->clear();
1136
1137                 if ( $wgUseSquid ) {
1138                         // Commit the transaction before the purge is sent
1139                         $dbw = wfGetDB( DB_MASTER );
1140                         $dbw->commit( __METHOD__ );
1141
1142                         // Send purge
1143                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1144                         $update->doUpdate();
1145                 }
1146
1147                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1148                         //@todo: move this logic to MessageCache
1149
1150                         if ( $this->mTitle->exists() ) {
1151                                 // NOTE: use transclusion text for messages.
1152                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1153
1154                                 $content = $this->getContent();
1155                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1156
1157                                 if ( $text === null ) $text = false;
1158                         } else {
1159                                 $text = false;
1160                         }
1161
1162                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1163                 }
1164                 return true;
1165         }
1166
1167         /**
1168          * Insert a new empty page record for this article.
1169          * This *must* be followed up by creating a revision
1170          * and running $this->updateRevisionOn( ... );
1171          * or else the record will be left in a funky state.
1172          * Best if all done inside a transaction.
1173          *
1174          * @param $dbw DatabaseBase
1175          * @return int The newly created page_id key, or false if the title already existed
1176          */
1177         public function insertOn( $dbw ) {
1178                 wfProfileIn( __METHOD__ );
1179
1180                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1181                 $dbw->insert( 'page', array(
1182                         'page_id'           => $page_id,
1183                         'page_namespace'    => $this->mTitle->getNamespace(),
1184                         'page_title'        => $this->mTitle->getDBkey(),
1185                         'page_counter'      => 0,
1186                         'page_restrictions' => '',
1187                         'page_is_redirect'  => 0, # Will set this shortly...
1188                         'page_is_new'       => 1,
1189                         'page_random'       => wfRandom(),
1190                         'page_touched'      => $dbw->timestamp(),
1191                         'page_latest'       => 0, # Fill this in shortly...
1192                         'page_len'          => 0, # Fill this in shortly...
1193                 ), __METHOD__, 'IGNORE' );
1194
1195                 $affected = $dbw->affectedRows();
1196
1197                 if ( $affected ) {
1198                         $newid = $dbw->insertId();
1199                         $this->mTitle->resetArticleID( $newid );
1200                 }
1201                 wfProfileOut( __METHOD__ );
1202
1203                 return $affected ? $newid : false;
1204         }
1205
1206         /**
1207          * Update the page record to point to a newly saved revision.
1208          *
1209          * @param $dbw DatabaseBase: object
1210          * @param $revision Revision: For ID number, and text used to set
1211          *                  length and redirect status fields
1212          * @param $lastRevision Integer: if given, will not overwrite the page field
1213          *                      when different from the currently set value.
1214          *                      Giving 0 indicates the new page flag should be set
1215          *                      on.
1216          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1217          *                           removing rows in redirect table.
1218          * @return bool true on success, false on failure
1219          * @private
1220          */
1221         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1222                 global $wgContentHandlerUseDB;
1223
1224                 wfProfileIn( __METHOD__ );
1225
1226                 $content = $revision->getContent();
1227                 $len = $content->getSize();
1228                 $rt = $content->getUltimateRedirectTarget();
1229
1230                 $conditions = array( 'page_id' => $this->getId() );
1231
1232                 if ( !is_null( $lastRevision ) ) {
1233                         # An extra check against threads stepping on each other
1234                         $conditions['page_latest'] = $lastRevision;
1235                 }
1236
1237                 $now = wfTimestampNow();
1238                 $row = array( /* SET */
1239                         'page_latest'      => $revision->getId(),
1240                         'page_touched'     => $dbw->timestamp( $now ),
1241                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1242                         'page_is_redirect' => $rt !== null ? 1 : 0,
1243                         'page_len'         => $len,
1244                 );
1245
1246                 if ( $wgContentHandlerUseDB ) {
1247                         $row[ 'page_content_model' ] = $revision->getContentModel();
1248                 }
1249
1250                 $dbw->update( 'page',
1251                         $row,
1252                         $conditions,
1253                         __METHOD__ );
1254
1255                 $result = $dbw->affectedRows() > 0;
1256                 if ( $result ) {
1257                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1258                         $this->setLastEdit( $revision );
1259                         $this->setCachedLastEditTime( $now );
1260                         $this->mLatest = $revision->getId();
1261                         $this->mIsRedirect = (bool)$rt;
1262                         # Update the LinkCache.
1263                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect,
1264                                                                                                         $this->mLatest, $revision->getContentModel() );
1265                 }
1266
1267                 wfProfileOut( __METHOD__ );
1268                 return $result;
1269         }
1270
1271         /**
1272          * Add row to the redirect table if this is a redirect, remove otherwise.
1273          *
1274          * @param $dbw DatabaseBase
1275          * @param $redirectTitle Title object pointing to the redirect target,
1276          *                       or NULL if this is not a redirect
1277          * @param $lastRevIsRedirect null|bool If given, will optimize adding and
1278          *                           removing rows in redirect table.
1279          * @return bool true on success, false on failure
1280          * @private
1281          */
1282         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1283                 // Always update redirects (target link might have changed)
1284                 // Update/Insert if we don't know if the last revision was a redirect or not
1285                 // Delete if changing from redirect to non-redirect
1286                 $isRedirect = !is_null( $redirectTitle );
1287
1288                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1289                         return true;
1290                 }
1291
1292                 wfProfileIn( __METHOD__ );
1293                 if ( $isRedirect ) {
1294                         $this->insertRedirectEntry( $redirectTitle );
1295                 } else {
1296                         // This is not a redirect, remove row from redirect table
1297                         $where = array( 'rd_from' => $this->getId() );
1298                         $dbw->delete( 'redirect', $where, __METHOD__ );
1299                 }
1300
1301                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1302                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1303                 }
1304                 wfProfileOut( __METHOD__ );
1305
1306                 return ( $dbw->affectedRows() != 0 );
1307         }
1308
1309         /**
1310          * If the given revision is newer than the currently set page_latest,
1311          * update the page record. Otherwise, do nothing.
1312          *
1313          * @param $dbw DatabaseBase object
1314          * @param $revision Revision object
1315          * @return mixed
1316          */
1317         public function updateIfNewerOn( $dbw, $revision ) {
1318                 wfProfileIn( __METHOD__ );
1319
1320                 $row = $dbw->selectRow(
1321                         array( 'revision', 'page' ),
1322                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1323                         array(
1324                                 'page_id' => $this->getId(),
1325                                 'page_latest=rev_id' ),
1326                         __METHOD__ );
1327
1328                 if ( $row ) {
1329                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1330                                 wfProfileOut( __METHOD__ );
1331                                 return false;
1332                         }
1333                         $prev = $row->rev_id;
1334                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1335                 } else {
1336                         # No or missing previous revision; mark the page as new
1337                         $prev = 0;
1338                         $lastRevIsRedirect = null;
1339                 }
1340
1341                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1342
1343                 wfProfileOut( __METHOD__ );
1344                 return $ret;
1345         }
1346
1347     /**
1348      * Get the content that needs to be saved in order to undo all revisions
1349      * between $undo and $undoafter. Revisions must belong to the same page,
1350      * must exist and must not be deleted
1351      * @param $undo Revision
1352      * @param $undoafter Revision Must be an earlier revision than $undo
1353      * @return mixed string on success, false on failure
1354      * @since 1.WD
1355      * Before we had the Content object, this was done in getUndoText
1356      */
1357     public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1358         $handler = $undo->getContentHandler();
1359         return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1360     }
1361
1362         /**
1363          * Get the text that needs to be saved in order to undo all revisions
1364          * between $undo and $undoafter. Revisions must belong to the same page,
1365          * must exist and must not be deleted
1366          * @param $undo Revision
1367          * @param $undoafter Revision Must be an earlier revision than $undo
1368          * @return mixed string on success, false on failure
1369          * @deprecated since 1.WD: use ContentHandler::getUndoContent() instead.
1370          */
1371         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1372                 wfDeprecated( __METHOD__, '1.WD' );
1373
1374                 $this->loadLastEdit();
1375
1376                 if ( $this->mLastRevision ) {
1377                         if ( is_null( $undoafter ) ) {
1378                                 $undoafter = $undo->getPrevious();
1379                         }
1380
1381                         $handler = $this->getContentHandler();
1382                         $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1383
1384                         if ( !$undone ) {
1385                                 return false;
1386                         } else {
1387                                 return ContentHandler::getContentText( $undone );
1388                         }
1389                 }
1390
1391                 return false;
1392         }
1393
1394         /**
1395          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1396          * @param $text String: new text of the section
1397          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1398          * @param $edittime String: revision timestamp or null to use the current revision
1399          * @return String new complete article text, or null if error
1400          *
1401          * @deprecated since 1.WD, use replaceSectionContent() instead
1402          */
1403         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) {
1404                 wfDeprecated( __METHOD__, '1.WD' );
1405
1406                 if ( strval( $section ) == '' ) { //NOTE: keep condition in sync with condition in replaceSectionContent!
1407                         // Whole-page edit; let the whole text through
1408                         return $text;
1409                 }
1410
1411                 if ( !$this->supportsSections() ) {
1412                         throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1413                 }
1414
1415                 # could even make section title, but that's not required.
1416                 $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() );
1417
1418                 $newContent = $this->replaceSectionContent( $section, $sectionContent, $sectionTitle, $edittime );
1419
1420                 return ContentHandler::getContentText( $newContent );
1421         }
1422
1423         /**
1424          * Returns true iff this page's content model supports sections.
1425          *
1426          * @return boolean whether sections are supported.
1427          *
1428          * @todo: the skin should check this and not offer section functionality if sections are not supported.
1429          * @todo: the EditPage should check this and not offer section functionality if sections are not supported.
1430          */
1431         public function supportsSections() {
1432                 return $this->getContentHandler()->supportsSections();
1433         }
1434
1435         /**
1436          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1437          * @param $content Content: new content of the section
1438          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1439          * @param $edittime String: revision timestamp or null to use the current revision
1440          *
1441          * @return Content new complete article content, or null if error
1442          *
1443          * @since 1.WD
1444          */
1445         public function replaceSectionContent( $section, Content $sectionContent, $sectionTitle = '', $edittime = null ) {
1446                 wfProfileIn( __METHOD__ );
1447
1448                 if ( strval( $section ) == '' ) {
1449                         // Whole-page edit; let the whole text through
1450                         $newContent = $sectionContent;
1451                 } else {
1452                         if ( !$this->supportsSections() ) {
1453                                 throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1454                         }
1455
1456                         // Bug 30711: always use current version when adding a new section
1457                         if ( is_null( $edittime ) || $section == 'new' ) {
1458                                 $oldContent = $this->getContent();
1459                                 if ( ! $oldContent ) {
1460                                         wfDebug( __METHOD__ . ": no page text\n" );
1461                                         wfProfileOut( __METHOD__ );
1462                                         return null;
1463                                 }
1464                         } else {
1465                                 $dbw = wfGetDB( DB_MASTER );
1466                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1467
1468                                 if ( !$rev ) {
1469                                         wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1470                                                 $this->getId() . "; section: $section; edittime: $edittime)\n" );
1471                                         wfProfileOut( __METHOD__ );
1472                                         return null;
1473                                 }
1474
1475                                 $oldContent = $rev->getContent();
1476                         }
1477
1478                         $newContent = $oldContent->replaceSection( $section, $sectionContent, $sectionTitle );
1479                 }
1480
1481                 wfProfileOut( __METHOD__ );
1482                 return $newContent;
1483         }
1484
1485         /**
1486          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1487          * @param $flags Int
1488          * @return Int updated $flags
1489          */
1490         function checkFlags( $flags ) {
1491                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1492                         if ( $this->mTitle->getArticleID() ) {
1493                                 $flags |= EDIT_UPDATE;
1494                         } else {
1495                                 $flags |= EDIT_NEW;
1496                         }
1497                 }
1498
1499                 return $flags;
1500         }
1501
1502         /**
1503          * Change an existing article or create a new article. Updates RC and all necessary caches,
1504          * optionally via the deferred update array.
1505          *
1506          * @param $text String: new text
1507          * @param $summary String: edit summary
1508          * @param $flags Integer bitfield:
1509          *      EDIT_NEW
1510          *          Article is known or assumed to be non-existent, create a new one
1511          *      EDIT_UPDATE
1512          *          Article is known or assumed to be pre-existing, update it
1513          *      EDIT_MINOR
1514          *          Mark this edit minor, if the user is allowed to do so
1515          *      EDIT_SUPPRESS_RC
1516          *          Do not log the change in recentchanges
1517          *      EDIT_FORCE_BOT
1518          *          Mark the edit a "bot" edit regardless of user rights
1519          *      EDIT_DEFER_UPDATES
1520          *          Defer some of the updates until the end of index.php
1521          *      EDIT_AUTOSUMMARY
1522          *          Fill in blank summaries with generated text where possible
1523          *
1524          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1525          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1526          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1527          * edit-already-exists error will be returned. These two conditions are also possible with
1528          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1529          *
1530          * @param $baseRevId int the revision ID this edit was based off, if any
1531          * @param $user User the user doing the edit
1532          *
1533          * @return Status object. Possible errors:
1534          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1535          *     edit-gone-missing:       In update mode, but the article didn't exist
1536          *     edit-conflict:           In update mode, the article changed unexpectedly
1537          *     edit-no-change:          Warning that the text was the same as before
1538          *     edit-already-exists:     In creation mode, but the article already exists
1539          *
1540          *  Extensions may define additional errors.
1541          *
1542          *  $return->value will contain an associative array with members as follows:
1543          *     new:                     Boolean indicating if the function attempted to create a new article
1544          *     revision:                The revision object for the inserted revision, or null
1545          *
1546          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1547          *
1548          * @deprecated since 1.WD: use doEditContent() instead.
1549          * @todo: use doEditContent() instead everywhere
1550          */
1551         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1552                 wfDeprecated( __METHOD__, '1.WD' );
1553
1554                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1555
1556                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1557         }
1558
1559         /**
1560          * Change an existing article or create a new article. Updates RC and all necessary caches,
1561          * optionally via the deferred update array.
1562          *
1563          * @param $content Content: new content
1564          * @param $summary String: edit summary
1565          * @param $flags Integer bitfield:
1566          *      EDIT_NEW
1567          *          Article is known or assumed to be non-existent, create a new one
1568          *      EDIT_UPDATE
1569          *          Article is known or assumed to be pre-existing, update it
1570          *      EDIT_MINOR
1571          *          Mark this edit minor, if the user is allowed to do so
1572          *      EDIT_SUPPRESS_RC
1573          *          Do not log the change in recentchanges
1574          *      EDIT_FORCE_BOT
1575          *          Mark the edit a "bot" edit regardless of user rights
1576          *      EDIT_DEFER_UPDATES
1577          *          Defer some of the updates until the end of index.php
1578          *      EDIT_AUTOSUMMARY
1579          *          Fill in blank summaries with generated text where possible
1580          *
1581          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1582          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1583          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1584          * edit-already-exists error will be returned. These two conditions are also possible with
1585          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1586          *
1587          * @param $baseRevId the revision ID this edit was based off, if any
1588          * @param $user User the user doing the edit
1589          * @param $serialisation_format String: format for storing the content in the database
1590          *
1591          * @return Status object. Possible errors:
1592          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1593          *     edit-gone-missing:       In update mode, but the article didn't exist
1594          *     edit-conflict:           In update mode, the article changed unexpectedly
1595          *     edit-no-change:          Warning that the text was the same as before
1596          *     edit-already-exists:     In creation mode, but the article already exists
1597          *
1598          *  Extensions may define additional errors.
1599          *
1600          *  $return->value will contain an associative array with members as follows:
1601          *     new:                     Boolean indicating if the function attempted to create a new article
1602          *     revision:                The revision object for the inserted revision, or null
1603          *
1604          * @since 1.WD
1605          */
1606         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1607                                                                    User $user = null, $serialisation_format = null ) {
1608                 global $wgUser, $wgUseAutomaticEditSummaries, $wgUseRCPatrol, $wgUseNPPatrol;
1609
1610                 # Low-level sanity check
1611                 if ( $this->mTitle->getText() === '' ) {
1612                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1613                 }
1614
1615                 wfProfileIn( __METHOD__ );
1616
1617                 $user = is_null( $user ) ? $wgUser : $user;
1618                 $status = Status::newGood( array() );
1619
1620                 // Load the data from the master database if needed.
1621                 // The caller may already loaded it from the master or even loaded it using
1622                 // SELECT FOR UPDATE, so do not override that using clear().
1623                 $this->loadPageData( 'fromdbmaster' );
1624
1625                 $flags = $this->checkFlags( $flags );
1626
1627                 # handle hook
1628                 $hook_args = array( &$this, &$user, &$content, &$summary,
1629                                                         $flags & EDIT_MINOR, null, null, &$flags, &$status );
1630
1631                 if ( !wfRunHooks( 'ArticleContentSave', $hook_args )
1632                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args ) ) {
1633
1634                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1635
1636                         if ( $status->isOK() ) {
1637                                 $status->fatal( 'edit-hook-aborted' );
1638                         }
1639
1640                         wfProfileOut( __METHOD__ );
1641                         return $status;
1642                 }
1643
1644                 # Silently ignore EDIT_MINOR if not allowed
1645                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1646                 $bot = $flags & EDIT_FORCE_BOT;
1647
1648                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1649
1650                 $oldsize = $old_content ? $old_content->getSize() : 0;
1651                 $oldid = $this->getLatest();
1652                 $oldIsRedirect = $this->isRedirect();
1653                 $oldcountable = $this->isCountable();
1654
1655                 $handler = $content->getContentHandler();
1656
1657                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1658                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1659                         if ( !$old_content ) $old_content = null;
1660                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1661                 }
1662
1663                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialisation_format );
1664                 $serialized = $editInfo->pst;
1665                 $content = $editInfo->pstContent;
1666                 $newsize =  $content->getSize();
1667
1668                 $dbw = wfGetDB( DB_MASTER );
1669                 $now = wfTimestampNow();
1670                 $this->mTimestamp = $now;
1671
1672                 if ( $flags & EDIT_UPDATE ) {
1673                         # Update article, but only if changed.
1674                         $status->value['new'] = false;
1675
1676                         if ( !$oldid ) {
1677                                 # Article gone missing
1678                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1679                                 $status->fatal( 'edit-gone-missing' );
1680
1681                                 wfProfileOut( __METHOD__ );
1682                                 return $status;
1683                         } elseif ( !$old_content ) {
1684                                 # Sanity check for bug 37225
1685                                 wfProfileOut( __METHOD__ );
1686                                 throw new MWException( "Could not find text for current revision {$oldid}." );
1687                         }
1688
1689                         $revision = new Revision( array(
1690                                 'page'       => $this->getId(),
1691                                 'comment'    => $summary,
1692                                 'minor_edit' => $isminor,
1693                                 'text'       => $serialized,
1694                                 'len'        => $newsize,
1695                                 'parent_id'  => $oldid,
1696                                 'user'       => $user->getId(),
1697                                 'user_text'  => $user->getName(),
1698                                 'timestamp'  => $now,
1699                                 'content_model' => $content->getModel(),
1700                                 'content_format' => $serialisation_format,
1701                         ) ); #XXX: pass content object?!
1702
1703                         # Bug 37225: use accessor to get the text as Revision may trim it.
1704                         # After trimming, the text may be a duplicate of the current text.
1705                         $content = $revision->getContent(); // sanity; EditPage should trim already
1706
1707                         $changed = !$content->equals( $old_content );
1708
1709                         if ( $changed ) {
1710                                 if ( !$content->isValid() ) {
1711                                         throw new MWException( "New content failed validity check!" );
1712                                 }
1713
1714                                 $dbw->begin( __METHOD__ );
1715
1716                                 $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1717                                 $status->merge( $prepStatus );
1718
1719                                 if ( !$status->isOK() ) {
1720                                         $dbw->rollback();
1721
1722                                         wfProfileOut( __METHOD__ );
1723                                         return $status;
1724                                 }
1725
1726                                 $revisionId = $revision->insertOn( $dbw );
1727
1728                                 # Update page
1729                                 #
1730                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1731                                 # during the course of this function. This makes sure that EditPage can detect
1732                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1733                                 # before this function is called. A previous function used a separate query, this
1734                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1735                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1736
1737                                 if ( !$ok ) {
1738                                         # Belated edit conflict! Run away!!
1739                                         $status->fatal( 'edit-conflict' );
1740
1741                                         $dbw->rollback( __METHOD__ );
1742
1743                                         wfProfileOut( __METHOD__ );
1744                                         return $status;
1745                                 }
1746
1747                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1748                                 # Update recentchanges
1749                                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1750                                         # Mark as patrolled if the user can do so
1751                                         $patrolled = $wgUseRCPatrol && !count(
1752                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1753                                         # Add RC row to the DB
1754                                         $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1755                                                 $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1756                                                 $revisionId, $patrolled
1757                                         );
1758
1759                                         # Log auto-patrolled edits
1760                                         if ( $patrolled ) {
1761                                                 PatrolLog::record( $rc, true, $user );
1762                                         }
1763                                 }
1764                                 $user->incEditCount();
1765                                 $dbw->commit( __METHOD__ );
1766                         } else {
1767                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1768                                 // related variables correctly
1769                                 $revision->setId( $this->getLatest() );
1770                         }
1771
1772                         # Update links tables, site stats, etc.
1773                         $this->doEditUpdates(
1774                                 $revision,
1775                                 $user,
1776                                 array(
1777                                         'changed' => $changed,
1778                                         'oldcountable' => $oldcountable
1779                                 )
1780                         );
1781
1782                         if ( !$changed ) {
1783                                 $status->warning( 'edit-no-change' );
1784                                 $revision = null;
1785                                 // Update page_touched, this is usually implicit in the page update
1786                                 // Other cache updates are done in onArticleEdit()
1787                                 $this->mTitle->invalidateCache();
1788                         }
1789                 } else {
1790                         # Create new article
1791                         $status->value['new'] = true;
1792
1793                         $dbw->begin( __METHOD__ );
1794
1795                         $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1796                         $status->merge( $prepStatus );
1797
1798                         if ( !$status->isOK() ) {
1799                                 $dbw->rollback();
1800
1801                                 wfProfileOut( __METHOD__ );
1802                                 return $status;
1803                         }
1804
1805                         $status->merge( $prepStatus );
1806
1807                         # Add the page record; stake our claim on this title!
1808                         # This will return false if the article already exists
1809                         $newid = $this->insertOn( $dbw );
1810
1811                         if ( $newid === false ) {
1812                                 $dbw->rollback( __METHOD__ );
1813                                 $status->fatal( 'edit-already-exists' );
1814
1815                                 wfProfileOut( __METHOD__ );
1816                                 return $status;
1817                         }
1818
1819                         # Save the revision text...
1820                         $revision = new Revision( array(
1821                                 'page'       => $newid,
1822                                 'comment'    => $summary,
1823                                 'minor_edit' => $isminor,
1824                                 'text'       => $serialized,
1825                                 'len'        => $newsize,
1826                                 'user'       => $user->getId(),
1827                                 'user_text'  => $user->getName(),
1828                                 'timestamp'  => $now,
1829                                 'content_model' => $content->getModel(),
1830                                 'content_format' => $serialisation_format,
1831                         ) );
1832                         $revisionId = $revision->insertOn( $dbw );
1833
1834                         # Bug 37225: use accessor to get the text as Revision may trim it
1835                         $content = $revision->getContent(); // sanity; get normalized version
1836
1837                         # Update the page record with revision data
1838                         $this->updateRevisionOn( $dbw, $revision, 0 );
1839
1840                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1841
1842                         # Update recentchanges
1843                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1844                                 # Mark as patrolled if the user can do so
1845                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1846                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1847                                 # Add RC row to the DB
1848                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1849                                         '', $content->getSize(), $revisionId, $patrolled );
1850
1851                                 # Log auto-patrolled edits
1852                                 if ( $patrolled ) {
1853                                         PatrolLog::record( $rc, true, $user );
1854                                 }
1855                         }
1856                         $user->incEditCount();
1857                         $dbw->commit( __METHOD__ );
1858
1859                         # Update links, etc.
1860                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1861
1862                         $hook_args = array( &$this, &$user, $content, $summary,
1863                                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision );
1864
1865                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $hook_args );
1866                         wfRunHooks( 'ArticleContentInsertComplete', $hook_args );
1867                 }
1868
1869                 # Do updates right now unless deferral was requested
1870                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1871                         DeferredUpdates::doUpdates();
1872                 }
1873
1874                 // Return the new revision (or null) to the caller
1875                 $status->value['revision'] = $revision;
1876
1877                 $hook_args = array( &$this, &$user, $content, $summary,
1878                                                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId );
1879
1880                 ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $hook_args );
1881                 wfRunHooks( 'ArticleContentSaveComplete', $hook_args );
1882
1883                 # Promote user to any groups they meet the criteria for
1884                 $user->addAutopromoteOnceGroups( 'onEdit' );
1885
1886                 wfProfileOut( __METHOD__ );
1887                 return $status;
1888         }
1889
1890         /**
1891          * Get parser options suitable for rendering the primary article wikitext
1892          * @param User|string $user User object or 'canonical'
1893          * @return ParserOptions
1894          */
1895         public function makeParserOptions( $user ) {
1896                 global $wgContLang;
1897                 if ( $user instanceof User ) { // settings per user (even anons)
1898                         $options = ParserOptions::newFromUser( $user );
1899                 } else { // canonical settings
1900                         $options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
1901                 }
1902                 $options->enableLimitReport(); // show inclusion/loop reports
1903                 $options->setTidy( true ); // fix bad HTML
1904                 return $options;
1905         }
1906
1907         /**
1908          * Prepare text which is about to be saved.
1909          * Returns a stdclass with source, pst and output members
1910          *
1911          * @deprecated in 1.WD: use prepareContentForEdit instead.
1912          */
1913         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1914                 wfDeprecated( __METHOD__, '1.WD' );
1915                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1916                 return $this->prepareContentForEdit( $content, $revid , $user );
1917         }
1918
1919         /**
1920          * Prepare content which is about to be saved.
1921          * Returns a stdclass with source, pst and output members
1922          *
1923          * @param \Content $content
1924          * @param null $revid
1925          * @param null|\User $user
1926          * @param null $serialization_format
1927          *
1928          * @return bool|object
1929          *
1930          * @since 1.WD
1931          */
1932         public function prepareContentForEdit( Content $content, $revid = null, User $user = null, $serialization_format = null ) {
1933                 global $wgParser, $wgContLang, $wgUser;
1934                 $user = is_null( $user ) ? $wgUser : $user;
1935                 // @TODO fixme: check $user->getId() here???
1936
1937                 if ( $this->mPreparedEdit
1938                         && $this->mPreparedEdit->newContent
1939                         && $this->mPreparedEdit->newContent->equals( $content )
1940                         && $this->mPreparedEdit->revid == $revid
1941                         && $this->mPreparedEdit->format == $serialization_format
1942                         #XXX: also check $user here?
1943                 ) {
1944                         // Already prepared
1945                         return $this->mPreparedEdit;
1946                 }
1947
1948                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
1949                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1950
1951                 $edit = (object)array();
1952                 $edit->revid = $revid;
1953
1954                 $edit->pstContent = $content->preSaveTransform( $this->mTitle, $user, $popts );
1955                 $edit->pst = $edit->pstContent->serialize( $serialization_format ); #XXX: do we need this??
1956                 $edit->format = $serialization_format;
1957
1958                 $edit->popts = $this->makeParserOptions( 'canonical' );
1959
1960                 $edit->output = $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts );
1961
1962                 $edit->newContent = $content;
1963                 $edit->oldContent = $this->getContent( Revision::RAW );
1964
1965                 #NOTE: B/C for hooks! don't use these fields!
1966                 $edit->newText = ContentHandler::getContentText( $edit->newContent );
1967                 $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : '';
1968
1969                 $this->mPreparedEdit = $edit;
1970
1971                 return $edit;
1972         }
1973
1974         /**
1975          * Do standard deferred updates after page edit.
1976          * Update links tables, site stats, search index and message cache.
1977          * Purges pages that include this page if the text was changed here.
1978          * Every 100th edit, prune the recent changes table.
1979          *
1980          * @param $revision Revision object
1981          * @param $user User object that did the revision
1982          * @param $options Array of options, following indexes are used:
1983          * - changed: boolean, whether the revision changed the content (default true)
1984          * - created: boolean, whether the revision created the page (default false)
1985          * - oldcountable: boolean or null (default null):
1986          *   - boolean: whether the page was counted as an article before that
1987          *     revision, only used in changed is true and created is false
1988          *   - null: don't change the article count
1989          */
1990         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
1991                 global $wgEnableParserCache;
1992
1993                 wfProfileIn( __METHOD__ );
1994
1995                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
1996                 $content = $revision->getContent();
1997
1998                 # Parse the text
1999                 # Be careful not to double-PST: $text is usually already PST-ed once
2000                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2001                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2002                         $editInfo = $this->prepareContentForEdit( $content, $revision->getId(), $user );
2003                 } else {
2004                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2005                         $editInfo = $this->mPreparedEdit;
2006                 }
2007
2008                 # Save it to the parser cache
2009                 if ( $wgEnableParserCache ) {
2010                         $parserCache = ParserCache::singleton();
2011                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
2012                 }
2013
2014                 # Update the links tables and other secondary data
2015                 $updates = $content->getSecondaryDataUpdates( $this->getTitle(), null, true, $editInfo->output );
2016                 DataUpdate::runUpdates( $updates );
2017
2018                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2019
2020                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2021                         if ( 0 == mt_rand( 0, 99 ) ) {
2022                                 // Flush old entries from the `recentchanges` table; we do this on
2023                                 // random requests so as to avoid an increase in writes for no good reason
2024                                 global $wgRCMaxAge;
2025
2026                                 $dbw = wfGetDB( DB_MASTER );
2027                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2028                                 $dbw->delete(
2029                                         'recentchanges',
2030                                         array( "rc_timestamp < '$cutoff'" ),
2031                                         __METHOD__
2032                                 );
2033                         }
2034                 }
2035
2036                 if ( !$this->mTitle->exists() ) {
2037                         wfProfileOut( __METHOD__ );
2038                         return;
2039                 }
2040
2041                 $id = $this->getId();
2042                 $title = $this->mTitle->getPrefixedDBkey();
2043                 $shortTitle = $this->mTitle->getDBkey();
2044
2045                 if ( !$options['changed'] ) {
2046                         $good = 0;
2047                         $total = 0;
2048                 } elseif ( $options['created'] ) {
2049                         $good = (int)$this->isCountable( $editInfo );
2050                         $total = 1;
2051                 } elseif ( $options['oldcountable'] !== null ) {
2052                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2053                         $total = 0;
2054                 } else {
2055                         $good = 0;
2056                         $total = 0;
2057                 }
2058
2059                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
2060                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content->getTextForSearchIndex() ) );
2061                 #@TODO: let the search engine decide what to do with the content object
2062
2063                 # If this is another user's talk page, update newtalk.
2064                 # Don't do this if $options['changed'] = false (null-edits) nor if
2065                 # it's a minor edit and the user doesn't want notifications for those.
2066                 if ( $options['changed']
2067                         && $this->mTitle->getNamespace() == NS_USER_TALK
2068                         && $shortTitle != $user->getTitleKey()
2069                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2070                 ) {
2071                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2072                                 $other = User::newFromName( $shortTitle, false );
2073                                 if ( !$other ) {
2074                                         wfDebug( __METHOD__ . ": invalid username\n" );
2075                                 } elseif ( User::isIP( $shortTitle ) ) {
2076                                         // An anonymous user
2077                                         $other->setNewtalk( true, $revision );
2078                                 } elseif ( $other->isLoggedIn() ) {
2079                                         $other->setNewtalk( true, $revision );
2080                                 } else {
2081                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2082                                 }
2083                         }
2084                 }
2085
2086                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2087                         #XXX: could skip pseudo-messages like js/css here, based on content model.
2088                         $msgtext = $content->getWikitextForTransclusion();
2089                         if ( $msgtext === false || $msgtext === null ) $msgtext = '';
2090
2091                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2092                 }
2093
2094                 if( $options['created'] ) {
2095                         self::onArticleCreate( $this->mTitle );
2096                 } else {
2097                         self::onArticleEdit( $this->mTitle );
2098                 }
2099
2100                 wfProfileOut( __METHOD__ );
2101         }
2102
2103         /**
2104          * Edit an article without doing all that other stuff
2105          * The article must already exist; link tables etc
2106          * are not updated, caches are not flushed.
2107          *
2108          * @param $text String: text submitted
2109          * @param $user User The relevant user
2110          * @param $comment String: comment submitted
2111          * @param $minor Boolean: whereas it's a minor modification
2112          *
2113          * @deprecated since 1.WD, use doEditContent() instead.
2114          */
2115         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2116                 wfDeprecated( __METHOD__, "1.WD" );
2117
2118                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2119                 return $this->doQuickEditContent( $content, $user, $comment , $minor );
2120         }
2121
2122         /**
2123          * Edit an article without doing all that other stuff
2124          * The article must already exist; link tables etc
2125          * are not updated, caches are not flushed.
2126          *
2127          * @param $content Content: content submitted
2128          * @param $user User The relevant user
2129          * @param $comment String: comment submitted
2130          * @param $serialisation_format String: format for storing the content in the database
2131          * @param $minor Boolean: whereas it's a minor modification
2132          */
2133         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = 0, $serialisation_format = null ) {
2134                 wfProfileIn( __METHOD__ );
2135
2136                 $serialized = $content->serialize( $serialisation_format );
2137
2138                 $dbw = wfGetDB( DB_MASTER );
2139                 $revision = new Revision( array(
2140                         'page'       => $this->getId(),
2141                         'text'       => $serialized,
2142                         'length'     => $content->getSize(),
2143                         'comment'    => $comment,
2144                         'minor_edit' => $minor ? 1 : 0,
2145                 ) ); #XXX: set the content object?
2146                 $revision->insertOn( $dbw );
2147                 $this->updateRevisionOn( $dbw, $revision );
2148
2149                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2150
2151                 wfProfileOut( __METHOD__ );
2152         }
2153
2154         /**
2155          * Update the article's restriction field, and leave a log entry.
2156          * This works for protection both existing and non-existing pages.
2157          *
2158          * @param $limit Array: set of restriction keys
2159          * @param $reason String
2160          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2161          * @param $expiry Array: per restriction type expiration
2162          * @param $user User The user updating the restrictions
2163          * @return Status
2164          */
2165         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
2166                 global $wgContLang;
2167
2168                 if ( wfReadOnly() ) {
2169                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2170                 }
2171
2172                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2173
2174                 $id = $this->mTitle->getArticleID();
2175
2176                 if ( !$cascade ) {
2177                         $cascade = false;
2178                 }
2179
2180                 // Take this opportunity to purge out expired restrictions
2181                 Title::purgeExpiredRestrictions();
2182
2183                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2184                 # we expect a single selection, but the schema allows otherwise.
2185                 $isProtected = false;
2186                 $protect = false;
2187                 $changed = false;
2188
2189                 $dbw = wfGetDB( DB_MASTER );
2190
2191                 foreach ( $restrictionTypes as $action ) {
2192                         if ( !isset( $expiry[$action] ) ) {
2193                                 $expiry[$action] = $dbw->getInfinity();
2194                         }
2195                         if ( !isset( $limit[$action] ) ) {
2196                                 $limit[$action] = '';
2197                         } elseif ( $limit[$action] != '' ) {
2198                                 $protect = true;
2199                         }
2200
2201                         # Get current restrictions on $action
2202                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2203                         if ( $current != '' ) {
2204                                 $isProtected = true;
2205                         }
2206
2207                         if ( $limit[$action] != $current ) {
2208                                 $changed = true;
2209                         } elseif ( $limit[$action] != '' ) {
2210                                 # Only check expiry change if the action is actually being
2211                                 # protected, since expiry does nothing on an not-protected
2212                                 # action.
2213                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2214                                         $changed = true;
2215                                 }
2216                         }
2217                 }
2218
2219                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2220                         $changed = true;
2221                 }
2222
2223                 # If nothing's changed, do nothing
2224                 if ( !$changed ) {
2225                         return Status::newGood();
2226                 }
2227
2228                 if ( !$protect ) { # No protection at all means unprotection
2229                         $revCommentMsg = 'unprotectedarticle';
2230                         $logAction = 'unprotect';
2231                 } elseif ( $isProtected ) {
2232                         $revCommentMsg = 'modifiedarticleprotection';
2233                         $logAction = 'modify';
2234                 } else {
2235                         $revCommentMsg = 'protectedarticle';
2236                         $logAction = 'protect';
2237                 }
2238
2239                 $encodedExpiry = array();
2240                 $protectDescription = '';
2241                 foreach ( $limit as $action => $restrictions ) {
2242                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
2243                         if ( $restrictions != '' ) {
2244                                 $protectDescription .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
2245                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2246                                         $protectDescription .= wfMsgForContent( 'protect-expiring',
2247                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2248                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2249                                                 $wgContLang->time( $expiry[$action], false, false ) );
2250                                 } else {
2251                                         $protectDescription .= wfMsgForContent( 'protect-expiry-indefinite' );
2252                                 }
2253
2254                                 $protectDescription .= ') ';
2255                         }
2256                 }
2257                 $protectDescription = trim( $protectDescription );
2258
2259                 if ( $id ) { # Protection of existing page
2260                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2261                                 return Status::newGood();
2262                         }
2263
2264                         # Only restrictions with the 'protect' right can cascade...
2265                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2266                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2267
2268                         # The schema allows multiple restrictions
2269                         if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2270                                 $cascade = false;
2271                         }
2272
2273                         # Update restrictions table
2274                         foreach ( $limit as $action => $restrictions ) {
2275                                 if ( $restrictions != '' ) {
2276                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2277                                                 array( 'pr_page' => $id,
2278                                                         'pr_type' => $action,
2279                                                         'pr_level' => $restrictions,
2280                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2281                                                         'pr_expiry' => $encodedExpiry[$action]
2282                                                 ),
2283                                                 __METHOD__
2284                                         );
2285                                 } else {
2286                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2287                                                 'pr_type' => $action ), __METHOD__ );
2288                                 }
2289                         }
2290
2291                         # Prepare a null revision to be added to the history
2292                         $editComment = $wgContLang->ucfirst( wfMsgForContent( $revCommentMsg, $this->mTitle->getPrefixedText() ) );
2293                         if ( $reason ) {
2294                                 $editComment .= ": $reason";
2295                         }
2296                         if ( $protectDescription ) {
2297                                 $editComment .= " ($protectDescription)";
2298                         }
2299                         if ( $cascade ) {
2300                                 $editComment .= ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2301                         }
2302
2303                         # Insert a null revision
2304                         $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2305                         $nullRevId = $nullRevision->insertOn( $dbw );
2306
2307                         $latest = $this->getLatest();
2308                         # Update page record
2309                         $dbw->update( 'page',
2310                                 array( /* SET */
2311                                         'page_touched' => $dbw->timestamp(),
2312                                         'page_restrictions' => '',
2313                                         'page_latest' => $nullRevId
2314                                 ), array( /* WHERE */
2315                                         'page_id' => $id
2316                                 ), __METHOD__
2317                         );
2318
2319                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2320                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2321                 } else { # Protection of non-existing page (also known as "title protection")
2322                         # Cascade protection is meaningless in this case
2323                         $cascade = false;
2324
2325                         if ( $limit['create'] != '' ) {
2326                                 $dbw->replace( 'protected_titles',
2327                                         array( array( 'pt_namespace', 'pt_title' ) ),
2328                                         array(
2329                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2330                                                 'pt_title' => $this->mTitle->getDBkey(),
2331                                                 'pt_create_perm' => $limit['create'],
2332                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
2333                                                 'pt_expiry' => $encodedExpiry['create'],
2334                                                 'pt_user' => $user->getId(),
2335                                                 'pt_reason' => $reason,
2336                                         ), __METHOD__
2337                                 );
2338                         } else {
2339                                 $dbw->delete( 'protected_titles',
2340                                         array(
2341                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2342                                                 'pt_title' => $this->mTitle->getDBkey()
2343                                         ), __METHOD__
2344                                 );
2345                         }
2346                 }
2347
2348                 $this->mTitle->flushRestrictions();
2349
2350                 if ( $logAction == 'unprotect' ) {
2351                         $logParams = array();
2352                 } else {
2353                         $logParams = array( $protectDescription, $cascade ? 'cascade' : '' );
2354                 }
2355
2356                 # Update the protection log
2357                 $log = new LogPage( 'protect' );
2358                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $logParams, $user );
2359
2360                 return Status::newGood();
2361         }
2362
2363         /**
2364          * Take an array of page restrictions and flatten it to a string
2365          * suitable for insertion into the page_restrictions field.
2366          * @param $limit Array
2367          * @return String
2368          */
2369         protected static function flattenRestrictions( $limit ) {
2370                 if ( !is_array( $limit ) ) {
2371                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2372                 }
2373
2374                 $bits = array();
2375                 ksort( $limit );
2376
2377                 foreach ( $limit as $action => $restrictions ) {
2378                         if ( $restrictions != '' ) {
2379                                 $bits[] = "$action=$restrictions";
2380                         }
2381                 }
2382
2383                 return implode( ':', $bits );
2384         }
2385
2386         /**
2387          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2388          * backwards compatibility, if you care about error reporting you should use
2389          * doDeleteArticleReal() instead.
2390          *
2391          * Deletes the article with database consistency, writes logs, purges caches
2392          *
2393          * @param $reason string delete reason for deletion log
2394          * @param $suppress boolean suppress all revisions and log the deletion in
2395          *        the suppression log instead of the deletion log
2396          * @param $id int article ID
2397          * @param $commit boolean defaults to true, triggers transaction end
2398          * @param &$error Array of errors to append to
2399          * @param $user User The deleting user
2400          * @return boolean true if successful
2401          */
2402         public function doDeleteArticle(
2403                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2404         ) {
2405                 $status = $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user );
2406                 return $status->isGood();
2407         }
2408
2409         /**
2410          * Back-end article deletion
2411          * Deletes the article with database consistency, writes logs, purges caches
2412          *
2413          * @since 1.19
2414          *
2415          * @param $reason string delete reason for deletion log
2416          * @param $suppress boolean suppress all revisions and log the deletion in
2417          *        the suppression log instead of the deletion log
2418          * @param $commit boolean defaults to true, triggers transaction end
2419          * @param &$error Array of errors to append to
2420          * @param $user User The deleting user
2421          * @return Status: Status object; if successful, $status->value is the log_id of the
2422          *                 deletion log entry. If the page couldn't be deleted because it wasn't
2423          *                 found, $status is a non-fatal 'cannotdelete' error
2424          */
2425         public function doDeleteArticleReal(
2426                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2427         ) {
2428                 global $wgUser, $wgContentHandlerUseDB;
2429
2430                 wfDebug( __METHOD__ . "\n" );
2431
2432                 $status = Status::newGood();
2433
2434                 if ( $this->mTitle->getDBkey() === '' ) {
2435                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2436                         return $status;
2437                 }
2438
2439                 $user = is_null( $user ) ? $wgUser : $user;
2440                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error, &$status ) ) ) {
2441                         if ( $status->isOK() ) {
2442                                 // Hook aborted but didn't set a fatal status
2443                                 $status->fatal( 'delete-hook-aborted' );
2444                         }
2445                         return $status;
2446                 }
2447
2448                 if ( $id == 0 ) {
2449                         $this->loadPageData( 'forupdate' );
2450                         $id = $this->getID();
2451                         if ( $id == 0 ) {
2452                                 $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2453                                 return $status;
2454                         }
2455                 }
2456
2457                 // Bitfields to further suppress the content
2458                 if ( $suppress ) {
2459                         $bitfield = 0;
2460                         // This should be 15...
2461                         $bitfield |= Revision::DELETED_TEXT;
2462                         $bitfield |= Revision::DELETED_COMMENT;
2463                         $bitfield |= Revision::DELETED_USER;
2464                         $bitfield |= Revision::DELETED_RESTRICTED;
2465                 } else {
2466                         $bitfield = 'rev_deleted';
2467                 }
2468
2469                 // we need to remember the old content so we can use it to generate all deletion updates.
2470                 $content = $this->getContent( Revision::RAW );
2471
2472                 $dbw = wfGetDB( DB_MASTER );
2473                 $dbw->begin( __METHOD__ );
2474                 // For now, shunt the revision data into the archive table.
2475                 // Text is *not* removed from the text table; bulk storage
2476                 // is left intact to avoid breaking block-compression or
2477                 // immutable storage schemes.
2478                 //
2479                 // For backwards compatibility, note that some older archive
2480                 // table entries will have ar_text and ar_flags fields still.
2481                 //
2482                 // In the future, we may keep revisions and mark them with
2483                 // the rev_deleted field, which is reserved for this purpose.
2484
2485                 $row = array(
2486                         'ar_namespace'  => 'page_namespace',
2487                         'ar_title'      => 'page_title',
2488                         'ar_comment'    => 'rev_comment',
2489                         'ar_user'       => 'rev_user',
2490                         'ar_user_text'  => 'rev_user_text',
2491                         'ar_timestamp'  => 'rev_timestamp',
2492                         'ar_minor_edit' => 'rev_minor_edit',
2493                         'ar_rev_id'     => 'rev_id',
2494                         'ar_parent_id'  => 'rev_parent_id',
2495                         'ar_text_id'    => 'rev_text_id',
2496                         'ar_text'       => '\'\'', // Be explicit to appease
2497                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2498                         'ar_len'        => 'rev_len',
2499                         'ar_page_id'    => 'page_id',
2500                         'ar_deleted'    => $bitfield,
2501                         'ar_sha1'       => 'rev_sha1',
2502                 );
2503
2504                 if ( $wgContentHandlerUseDB ) {
2505                         $row[ 'ar_content_model' ] = 'rev_content_model';
2506                         $row[ 'ar_content_format' ] = 'rev_content_format';
2507                 }
2508
2509                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2510                         $row,
2511                         array(
2512                                 'page_id' => $id,
2513                                 'page_id = rev_page'
2514                         ), __METHOD__
2515                 );
2516
2517                 # Now that it's safely backed up, delete it
2518                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2519                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleID() uses slave, could be laggy
2520
2521                 if ( !$ok ) {
2522                         $dbw->rollback( __METHOD__ );
2523                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2524                         return $status;
2525                 }
2526
2527                 $this->doDeleteUpdates( $id, $content );
2528
2529                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2530                 $logtype = $suppress ? 'suppress' : 'delete';
2531
2532                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2533                 $logEntry->setPerformer( $user );
2534                 $logEntry->setTarget( $this->mTitle );
2535                 $logEntry->setComment( $reason );
2536                 $logid = $logEntry->insert();
2537                 $logEntry->publish( $logid );
2538
2539                 if ( $commit ) {
2540                         $dbw->commit( __METHOD__ );
2541                 }
2542
2543                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
2544                 $status->value = $logid;
2545                 return $status;
2546         }
2547
2548         /**
2549          * Do some database updates after deletion
2550          *
2551          * @param $id Int: page_id value of the page being deleted (B/C, currently unused)
2552          * @param $content Content: optional page content to be used when determining the required updates.
2553          *        This may be needed because $this->getContent() may already return null when the page proper was deleted.
2554          */
2555         public function doDeleteUpdates( $id, Content $content = null ) {
2556                 # update site status
2557                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2558
2559                 # remove secondary indexes, etc
2560                 $updates = $this->getDeletionUpdates( $content );
2561                 DataUpdate::runUpdates( $updates );
2562
2563                 # Clear caches
2564                 WikiPage::onArticleDelete( $this->mTitle );
2565
2566                 # Reset this object
2567                 $this->clear();
2568
2569                 # Clear the cached article id so the interface doesn't act like we exist
2570                 $this->mTitle->resetArticleID( 0 );
2571         }
2572
2573         /**
2574          * Roll back the most recent consecutive set of edits to a page
2575          * from the same user; fails if there are no eligible edits to
2576          * roll back to, e.g. user is the sole contributor. This function
2577          * performs permissions checks on $user, then calls commitRollback()
2578          * to do the dirty work
2579          *
2580          * @todo: seperate the business/permission stuff out from backend code
2581          *
2582          * @param $fromP String: Name of the user whose edits to rollback.
2583          * @param $summary String: Custom summary. Set to default summary if empty.
2584          * @param $token String: Rollback token.
2585          * @param $bot Boolean: If true, mark all reverted edits as bot.
2586          *
2587          * @param $resultDetails Array: contains result-specific array of additional values
2588          *    'alreadyrolled' : 'current' (rev)
2589          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2590          *
2591          * @param $user User The user performing the rollback
2592          * @return array of errors, each error formatted as
2593          *   array(messagekey, param1, param2, ...).
2594          * On success, the array is empty.  This array can also be passed to
2595          * OutputPage::showPermissionsErrorPage().
2596          */
2597         public function doRollback(
2598                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2599         ) {
2600                 $resultDetails = null;
2601
2602                 # Check permissions
2603                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2604                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2605                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2606
2607                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2608                         $errors[] = array( 'sessionfailure' );
2609                 }
2610
2611                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2612                         $errors[] = array( 'actionthrottledtext' );
2613                 }
2614
2615                 # If there were errors, bail out now
2616                 if ( !empty( $errors ) ) {
2617                         return $errors;
2618                 }
2619
2620                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2621         }
2622
2623         /**
2624          * Backend implementation of doRollback(), please refer there for parameter
2625          * and return value documentation
2626          *
2627          * NOTE: This function does NOT check ANY permissions, it just commits the
2628          * rollback to the DB. Therefore, you should only call this function direct-
2629          * ly if you want to use custom permissions checks. If you don't, use
2630          * doRollback() instead.
2631          * @param $fromP String: Name of the user whose edits to rollback.
2632          * @param $summary String: Custom summary. Set to default summary if empty.
2633          * @param $bot Boolean: If true, mark all reverted edits as bot.
2634          *
2635          * @param $resultDetails Array: contains result-specific array of additional values
2636          * @param $guser User The user performing the rollback
2637          * @return array
2638          */
2639         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2640                 global $wgUseRCPatrol, $wgContLang;
2641
2642                 $dbw = wfGetDB( DB_MASTER );
2643
2644                 if ( wfReadOnly() ) {
2645                         return array( array( 'readonlytext' ) );
2646                 }
2647
2648                 # Get the last editor
2649                 $current = $this->getRevision();
2650                 if ( is_null( $current ) ) {
2651                         # Something wrong... no page?
2652                         return array( array( 'notanarticle' ) );
2653                 }
2654
2655                 $from = str_replace( '_', ' ', $fromP );
2656                 # User name given should match up with the top revision.
2657                 # If the user was deleted then $from should be empty.
2658                 if ( $from != $current->getUserText() ) {
2659                         $resultDetails = array( 'current' => $current );
2660                         return array( array( 'alreadyrolled',
2661                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2662                                 htmlspecialchars( $fromP ),
2663                                 htmlspecialchars( $current->getUserText() )
2664                         ) );
2665                 }
2666
2667                 # Get the last edit not by this guy...
2668                 # Note: these may not be public values
2669                 $user = intval( $current->getRawUser() );
2670                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2671                 $s = $dbw->selectRow( 'revision',
2672                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2673                         array( 'rev_page' => $current->getPage(),
2674                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2675                         ), __METHOD__,
2676                         array( 'USE INDEX' => 'page_timestamp',
2677                                 'ORDER BY' => 'rev_timestamp DESC' )
2678                         );
2679                 if ( $s === false ) {
2680                         # No one else ever edited this page
2681                         return array( array( 'cantrollback' ) );
2682                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2683                         # Only admins can see this text
2684                         return array( array( 'notvisiblerev' ) );
2685                 }
2686
2687                 $set = array();
2688                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2689                         # Mark all reverted edits as bot
2690                         $set['rc_bot'] = 1;
2691                 }
2692
2693                 if ( $wgUseRCPatrol ) {
2694                         # Mark all reverted edits as patrolled
2695                         $set['rc_patrolled'] = 1;
2696                 }
2697
2698                 if ( count( $set ) ) {
2699                         $dbw->update( 'recentchanges', $set,
2700                                 array( /* WHERE */
2701                                         'rc_cur_id' => $current->getPage(),
2702                                         'rc_user_text' => $current->getUserText(),
2703                                         "rc_timestamp > '{$s->rev_timestamp}'",
2704                                 ), __METHOD__
2705                         );
2706                 }
2707
2708                 # Generate the edit summary if necessary
2709                 $target = Revision::newFromId( $s->rev_id );
2710                 if ( empty( $summary ) ) {
2711                         if ( $from == '' ) { // no public user name
2712                                 $summary = wfMsgForContent( 'revertpage-nouser' );
2713                         } else {
2714                                 $summary = wfMsgForContent( 'revertpage' );
2715                         }
2716                 }
2717
2718                 # Allow the custom summary to use the same args as the default message
2719                 $args = array(
2720                         $target->getUserText(), $from, $s->rev_id,
2721                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2722                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2723                 );
2724                 $summary = wfMsgReplaceArgs( $summary, $args );
2725
2726                 # Save
2727                 $flags = EDIT_UPDATE;
2728
2729                 if ( $guser->isAllowed( 'minoredit' ) ) {
2730                         $flags |= EDIT_MINOR;
2731                 }
2732
2733                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2734                         $flags |= EDIT_FORCE_BOT;
2735                 }
2736
2737                 # Actually store the edit
2738                 $status = $this->doEditContent( $target->getContent(), $summary, $flags, $target->getId(), $guser );
2739
2740                 if ( !$status->isOK() ) {
2741                         return $status->getErrorsArray();
2742                 }
2743
2744                 if ( !empty( $status->value['revision'] ) ) {
2745                         $revId = $status->value['revision']->getId();
2746                 } else {
2747                         $revId = false;
2748                 }
2749
2750                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
2751
2752                 $resultDetails = array(
2753                         'summary' => $summary,
2754                         'current' => $current,
2755                         'target'  => $target,
2756                         'newid'   => $revId
2757                 );
2758
2759                 return array();
2760         }
2761
2762         /**
2763          * The onArticle*() functions are supposed to be a kind of hooks
2764          * which should be called whenever any of the specified actions
2765          * are done.
2766          *
2767          * This is a good place to put code to clear caches, for instance.
2768          *
2769          * This is called on page move and undelete, as well as edit
2770          *
2771          * @param $title Title object
2772          */
2773         public static function onArticleCreate( $title ) {
2774                 # Update existence markers on article/talk tabs...
2775                 if ( $title->isTalkPage() ) {
2776                         $other = $title->getSubjectPage();
2777                 } else {
2778                         $other = $title->getTalkPage();
2779                 }
2780
2781                 $other->invalidateCache();
2782                 $other->purgeSquid();
2783
2784                 $title->touchLinks();
2785                 $title->purgeSquid();
2786                 $title->deleteTitleProtection();
2787         }
2788
2789         /**
2790          * Clears caches when article is deleted
2791          *
2792          * @param $title Title
2793          */
2794         public static function onArticleDelete( $title ) {
2795                 # Update existence markers on article/talk tabs...
2796                 if ( $title->isTalkPage() ) {
2797                         $other = $title->getSubjectPage();
2798                 } else {
2799                         $other = $title->getTalkPage();
2800                 }
2801
2802                 $other->invalidateCache();
2803                 $other->purgeSquid();
2804
2805                 $title->touchLinks();
2806                 $title->purgeSquid();
2807
2808                 # File cache
2809                 HTMLFileCache::clearFileCache( $title );
2810
2811                 # Messages
2812                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2813                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2814                 }
2815
2816                 # Images
2817                 if ( $title->getNamespace() == NS_FILE ) {
2818                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2819                         $update->doUpdate();
2820                 }
2821
2822                 # User talk pages
2823                 if ( $title->getNamespace() == NS_USER_TALK ) {
2824                         $user = User::newFromName( $title->getText(), false );
2825                         if ( $user ) {
2826                                 $user->setNewtalk( false );
2827                         }
2828                 }
2829
2830                 # Image redirects
2831                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2832         }
2833
2834         /**
2835          * Purge caches on page update etc
2836          *
2837          * @param $title Title object
2838          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2839          */
2840         public static function onArticleEdit( $title ) {
2841                 // Invalidate caches of articles which include this page
2842                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2843
2844
2845                 // Invalidate the caches of all pages which redirect here
2846                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2847
2848                 # Purge squid for this page only
2849                 $title->purgeSquid();
2850
2851                 # Clear file cache for this page only
2852                 HTMLFileCache::clearFileCache( $title );
2853         }
2854
2855         /**#@-*/
2856
2857         /**
2858          * Returns a list of hidden categories this page is a member of.
2859          * Uses the page_props and categorylinks tables.
2860          *
2861          * @return Array of Title objects
2862          */
2863         public function getHiddenCategories() {
2864                 $result = array();
2865                 $id = $this->mTitle->getArticleID();
2866
2867                 if ( $id == 0 ) {
2868                         return array();
2869                 }
2870
2871                 $dbr = wfGetDB( DB_SLAVE );
2872                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2873                         array( 'cl_to' ),
2874                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2875                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2876                         __METHOD__ );
2877
2878                 if ( $res !== false ) {
2879                         foreach ( $res as $row ) {
2880                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2881                         }
2882                 }
2883
2884                 return $result;
2885         }
2886
2887         /**
2888         * Return an applicable autosummary if one exists for the given edit.
2889         * @param $oldtext String|null: the previous text of the page.
2890         * @param $newtext String|null: The submitted text of the page.
2891         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2892         * @return string An appropriate autosummary, or an empty string.
2893         *
2894         * @deprecated since 1.WD, use ContentHandler::getAutosummary() instead
2895         */
2896         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2897                 # NOTE: stub for backwards-compatibility. assumes the given text is wikitext. will break horribly if it isn't.
2898
2899                 wfDeprecated( __METHOD__, '1.WD' );
2900
2901                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
2902                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
2903                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
2904
2905                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
2906         }
2907
2908         /**
2909          * Auto-generates a deletion reason
2910          *
2911          * @param &$hasHistory Boolean: whether the page has a history
2912          * @return mixed String containing deletion reason or empty string, or boolean false
2913          *    if no revision occurred
2914          */
2915         public function getAutoDeleteReason( &$hasHistory ) {
2916                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
2917         }
2918
2919         /**
2920          * Update all the appropriate counts in the category table, given that
2921          * we've added the categories $added and deleted the categories $deleted.
2922          *
2923          * @param $added array   The names of categories that were added
2924          * @param $deleted array The names of categories that were deleted
2925          */
2926         public function updateCategoryCounts( $added, $deleted ) {
2927                 $ns = $this->mTitle->getNamespace();
2928                 $dbw = wfGetDB( DB_MASTER );
2929
2930                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2931                 # exist, we might legitimately not create it, but it's simpler to just
2932                 # create it and then give it a negative value, since the value is bogus
2933                 # anyway.
2934                 #
2935                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2936                 $insertCats = array_merge( $added, $deleted );
2937                 if ( !$insertCats ) {
2938                         # Okay, nothing to do
2939                         return;
2940                 }
2941
2942                 $insertRows = array();
2943
2944                 foreach ( $insertCats as $cat ) {
2945                         $insertRows[] = array(
2946                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2947                                 'cat_title' => $cat
2948                         );
2949                 }
2950                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2951
2952                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2953                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2954
2955                 if ( $ns == NS_CATEGORY ) {
2956                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2957                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2958                 } elseif ( $ns == NS_FILE ) {
2959                         $addFields[]    = 'cat_files = cat_files + 1';
2960                         $removeFields[] = 'cat_files = cat_files - 1';
2961                 }
2962
2963                 if ( $added ) {
2964                         $dbw->update(
2965                                 'category',
2966                                 $addFields,
2967                                 array( 'cat_title' => $added ),
2968                                 __METHOD__
2969                         );
2970                 }
2971
2972                 if ( $deleted ) {
2973                         $dbw->update(
2974                                 'category',
2975                                 $removeFields,
2976                                 array( 'cat_title' => $deleted ),
2977                                 __METHOD__
2978                         );
2979                 }
2980         }
2981
2982         /**
2983          * Updates cascading protections
2984          *
2985          * @param $parserOutput ParserOutput object for the current version
2986          */
2987         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
2988                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
2989                         return;
2990                 }
2991
2992                 // templatelinks table may have become out of sync,
2993                 // especially if using variable-based transclusions.
2994                 // For paranoia, check if things have changed and if
2995                 // so apply updates to the database. This will ensure
2996                 // that cascaded protections apply as soon as the changes
2997                 // are visible.
2998
2999                 # Get templates from templatelinks
3000                 $id = $this->mTitle->getArticleID();
3001
3002                 $tlTemplates = array();
3003
3004                 $dbr = wfGetDB( DB_SLAVE );
3005                 $res = $dbr->select( array( 'templatelinks' ),
3006                         array( 'tl_namespace', 'tl_title' ),
3007                         array( 'tl_from' => $id ),
3008                         __METHOD__
3009                 );
3010
3011                 foreach ( $res as $row ) {
3012                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
3013                 }
3014
3015                 # Get templates from parser output.
3016                 $poTemplates = array();
3017                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3018                         foreach ( $templates as $dbk => $id ) {
3019                                 $poTemplates["$ns:$dbk"] = true;
3020                         }
3021                 }
3022
3023                 # Get the diff
3024                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
3025
3026                 if ( count( $templates_diff ) > 0 ) {
3027                         # Whee, link updates time.
3028                         # Note: we are only interested in links here. We don't need to get other DataUpdate items from the parser output.
3029                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3030                         $u->doUpdate();
3031                 }
3032         }
3033
3034         /**
3035          * Return a list of templates used by this article.
3036          * Uses the templatelinks table
3037          *
3038          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
3039          * @return Array of Title objects
3040          */
3041         public function getUsedTemplates() {
3042                 return $this->mTitle->getTemplateLinksFrom();
3043         }
3044
3045         /**
3046          * Perform article updates on a special page creation.
3047          *
3048          * @param $rev Revision object
3049          *
3050          * @todo This is a shitty interface function. Kill it and replace the
3051          * other shitty functions like doEditUpdates and such so it's not needed
3052          * anymore.
3053          * @deprecated since 1.18, use doEditUpdates()
3054          */
3055         public function createUpdates( $rev ) {
3056                 wfDeprecated( __METHOD__, '1.18' );
3057                 global $wgUser;
3058                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
3059         }
3060
3061         /**
3062          * This function is called right before saving the wikitext,
3063          * so we can do things like signatures and links-in-context.
3064          *
3065          * @deprecated in 1.19; use Parser::preSaveTransform() instead
3066          * @param $text String article contents
3067          * @param $user User object: user doing the edit
3068          * @param $popts ParserOptions object: parser options, default options for
3069          *               the user loaded if null given
3070          * @return string article contents with altered wikitext markup (signatures
3071          *      converted, {{subst:}}, templates, etc.)
3072          */
3073         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3074                 global $wgParser, $wgUser;
3075
3076                 wfDeprecated( __METHOD__, '1.19' );
3077
3078                 $user = is_null( $user ) ? $wgUser : $user;
3079
3080                 if ( $popts === null ) {
3081                         $popts = ParserOptions::newFromUser( $user );
3082                 }
3083
3084                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3085         }
3086
3087         /**
3088          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
3089          *
3090          * @deprecated in 1.19; use Title::isBigDeletion() instead.
3091          * @return bool
3092          */
3093         public function isBigDeletion() {
3094                 wfDeprecated( __METHOD__, '1.19' );
3095                 return $this->mTitle->isBigDeletion();
3096         }
3097
3098         /**
3099          * Get the  approximate revision count of this page.
3100          *
3101          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
3102          * @return int
3103          */
3104         public function estimateRevisionCount() {
3105                 wfDeprecated( __METHOD__, '1.19' );
3106                 return $this->mTitle->estimateRevisionCount();
3107         }
3108
3109         /**
3110          * Update the article's restriction field, and leave a log entry.
3111          *
3112          * @deprecated since 1.19
3113          * @param $limit Array: set of restriction keys
3114          * @param $reason String
3115          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
3116          * @param $expiry Array: per restriction type expiration
3117          * @param $user User The user updating the restrictions
3118          * @return bool true on success
3119          */
3120         public function updateRestrictions(
3121                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
3122         ) {
3123                 global $wgUser;
3124
3125                 $user = is_null( $user ) ? $wgUser : $user;
3126
3127                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
3128         }
3129
3130         /**
3131          * @deprecated since 1.18
3132          */
3133         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3134                 wfDeprecated( __METHOD__, '1.18' );
3135                 global $wgUser;
3136                 $this->doQuickEdit( $text, $wgUser, $comment, $minor );
3137         }
3138
3139         /**
3140          * @deprecated since 1.18
3141          */
3142         public function viewUpdates() {
3143                 wfDeprecated( __METHOD__, '1.18' );
3144                 global $wgUser;
3145                 return $this->doViewUpdates( $wgUser );
3146         }
3147
3148         /**
3149          * @deprecated since 1.18
3150          * @return bool
3151          */
3152         public function useParserCache( $oldid ) {
3153                 wfDeprecated( __METHOD__, '1.18' );
3154                 global $wgUser;
3155                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
3156         }
3157
3158         /**
3159          * Returns a list of updates to be performed when this page is deleted. The updates should remove any information
3160          * about this page from secondary data stores such as links tables.
3161          *
3162          * @param Content|null $content optional Content object for determining the necessary updates
3163          * @return Array an array of DataUpdates objects
3164          */
3165         public function getDeletionUpdates( Content $content = null ) {
3166                 if ( !$content ) {
3167                         // load content object, which may be used to determine the necessary updates
3168                         // XXX: the content may not be needed to determine the updates, then this would be overhead.
3169                         $content = $this->getContent( Revision::RAW );
3170                 }
3171
3172                 if ( !$content ) {
3173                         $updates = array();
3174                 } else {
3175                         $updates = $content->getDeletionUpdates( $this->mTitle );
3176                 }
3177
3178                 wfRunHooks( 'WikiPageDeletionUpdates', array( $this, $content, &$updates ) );
3179                 return $updates;
3180         }
3181
3182 }
3183
3184 class PoolWorkArticleView extends PoolCounterWork {
3185
3186         /**
3187          * @var Page
3188          */
3189         private $page;
3190
3191         /**
3192          * @var string
3193          */
3194         private $cacheKey;
3195
3196         /**
3197          * @var integer
3198          */
3199         private $revid;
3200
3201         /**
3202          * @var ParserOptions
3203          */
3204         private $parserOptions;
3205
3206         /**
3207          * @var Content|null
3208          */
3209         private $content = null;
3210
3211         /**
3212          * @var ParserOutput|bool
3213          */
3214         private $parserOutput = false;
3215
3216         /**
3217          * @var bool
3218          */
3219         private $isDirty = false;
3220
3221         /**
3222          * @var Status|bool
3223          */
3224         private $error = false;
3225
3226         /**
3227          * Constructor
3228          *
3229          * @param $page Page
3230          * @param $revid Integer: ID of the revision being parsed
3231          * @param $useParserCache Boolean: whether to use the parser cache
3232          * @param $parserOptions parserOptions to use for the parse operation
3233          * @param $content Content|String: content to parse or null to load it; may also be given as a wikitext string, for BC
3234          */
3235         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $content = null ) {
3236                 if ( is_string($content) ) { #BC: old style call
3237                         $modelId = $page->getRevision()->getContentModel();
3238                         $format = $page->getRevision()->getContentFormat();
3239                         $content = ContentHandler::makeContent( $content, $page->getTitle(), $modelId, $format );
3240                 }
3241
3242                 $this->page = $page;
3243                 $this->revid = $revid;
3244                 $this->cacheable = $useParserCache;
3245                 $this->parserOptions = $parserOptions;
3246                 $this->content = $content;
3247                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
3248                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
3249         }
3250
3251         /**
3252          * Get the ParserOutput from this object, or false in case of failure
3253          *
3254          * @return ParserOutput
3255          */
3256         public function getParserOutput() {
3257                 return $this->parserOutput;
3258         }
3259
3260         /**
3261          * Get whether the ParserOutput is a dirty one (i.e. expired)
3262          *
3263          * @return bool
3264          */
3265         public function getIsDirty() {
3266                 return $this->isDirty;
3267         }
3268
3269         /**
3270          * Get a Status object in case of error or false otherwise
3271          *
3272          * @return Status|bool
3273          */
3274         public function getError() {
3275                 return $this->error;
3276         }
3277
3278         /**
3279          * @return bool
3280          */
3281         function doWork() {
3282                 global $wgUseFileCache;
3283
3284                 // @todo: several of the methods called on $this->page are not declared in Page, but present
3285                 //        in WikiPage and delegated by Article.
3286
3287                 $isCurrent = $this->revid === $this->page->getLatest();
3288
3289                 if ( $this->content !== null ) {
3290                         $content = $this->content;
3291                 } elseif ( $isCurrent ) {
3292                         #XXX: why use RAW audience here, and PUBLIC (default) below?
3293                         $content = $this->page->getContent( Revision::RAW );
3294                 } else {
3295                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
3296                         if ( $rev === null ) {
3297                                 return false;
3298                         }
3299
3300                         #XXX: why use PUBLIC audience here (default), and RAW above?
3301                         $content = $rev->getContent();
3302                 }
3303
3304                 $time = - microtime( true );
3305                 $this->parserOutput = $content->getParserOutput( $this->page->getTitle(), $this->revid, $this->parserOptions );
3306                 $time += microtime( true );
3307
3308                 # Timing hack
3309                 if ( $time > 3 ) {
3310                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
3311                                 $this->page->getTitle()->getPrefixedDBkey() ) );
3312                 }
3313
3314                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
3315                         ParserCache::singleton()->save( $this->parserOutput, $this->page, $this->parserOptions );
3316                 }
3317
3318                 // Make sure file cache is not used on uncacheable content.
3319                 // Output that has magic words in it can still use the parser cache
3320                 // (if enabled), though it will generally expire sooner.
3321                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
3322                         $wgUseFileCache = false;
3323                 }
3324
3325                 if ( $isCurrent ) {
3326                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
3327                 }
3328
3329                 return true;
3330         }
3331
3332         /**
3333          * @return bool
3334          */
3335         function getCachedWork() {
3336                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
3337
3338                 if ( $this->parserOutput === false ) {
3339                         wfDebug( __METHOD__ . ": parser cache miss\n" );
3340                         return false;
3341                 } else {
3342                         wfDebug( __METHOD__ . ": parser cache hit\n" );
3343                         return true;
3344                 }
3345         }
3346
3347         /**
3348          * @return bool
3349          */
3350         function fallback() {
3351                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
3352
3353                 if ( $this->parserOutput === false ) {
3354                         wfDebugLog( 'dirty', "dirty missing\n" );
3355                         wfDebug( __METHOD__ . ": no dirty cache\n" );
3356                         return false;
3357                 } else {
3358                         wfDebug( __METHOD__ . ": sending dirty output\n" );
3359                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
3360                         $this->isDirty = true;
3361                         return true;
3362                 }
3363         }
3364
3365         /**
3366          * @param $status Status
3367          * @return bool
3368          */
3369         function error( $status ) {
3370                 $this->error = $status;
3371                 return false;
3372         }
3373 }
3374