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 {
  37         // Constants for $mDataLoadedFrom and related
  38
  39         /**
  40          * Data has not been loaded yet (or the object was cleared)
  41          */
  42         const DATA_NOT_LOADED = 0;
  43
  44         /**
  45          * Data has been loaded from a slave database
  46          */
  47         const DATA_FROM_SLAVE = 1;
  48
  49         /**
  50          * Data has been loaded from the master database
  51          */
  52         const DATA_FROM_MASTER = 2;
  53
  54         /**
  55          * Data has been loaded from the master database using FOR UPDATE
  56          */
  57         const DATA_FOR_UPDATE = 3;
  58
  59         /**
  60          * @var Title
  61          */
  62         public $mTitle = null;
  63
  64         /**@{{
  65          * @protected
  66          */
  67         public $mDataLoaded = false;         // !< Boolean
  68         public $mIsRedirect = false;         // !< Boolean
  69         public $mLatest = false;             // !< Integer (false means "not loaded")
  70         public $mPreparedEdit = false;       // !< Array
  71         /**@}}*/
  72
  73         /**
  74          * @var int; one of the DATA_* constants
  75          */
  76         protected $mDataLoadedFrom = self::DATA_NOT_LOADED;
  77
  78         /**
  79          * @var Title
  80          */
  81         protected $mRedirectTarget = null;
  82
  83         /**
  84          * @var Revision
  85          */
  86         protected $mLastRevision = null;
  87
  88         /**
  89          * @var string; timestamp of the current revision or empty string if not loaded
  90          */
  91         protected $mTimestamp = '';
  92
  93         /**
  94          * @var string
  95          */
  96         protected $mTouched = '19700101000000';
  97
  98         /**
  99          * @var int|null
 100          */
 101         protected $mCounter = null;
 102
 103         /**
 104          * Constructor and clear the article
 105          * @param $title Title Reference to a Title object.
 106          */
 107         public function __construct( Title $title ) {
 108                 $this->mTitle = $title;
 109         }
 110
 111         /**
 112          * Create a WikiPage object of the appropriate class for the given title.
 113          *
 114          * @param $title Title
 115          * @return WikiPage object of the appropriate type
 116          */
 117         public static function factory( Title $title ) {
 118                 $ns = $title->getNamespace();
 119
 120                 if ( $ns == NS_MEDIA ) {
 121                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 122                 } elseif ( $ns < 0 ) {
 123                         throw new MWException( "Invalid or virtual namespace $ns given." );
 124                 }
 125
 126                 switch ( $ns ) {
 127                         case NS_FILE:
 128                                 $page = new WikiFilePage( $title );
 129                                 break;
 130                         case NS_CATEGORY:
 131                                 $page = new WikiCategoryPage( $title );
 132                                 break;
 133                         default:
 134                                 $page = new WikiPage( $title );
 135                 }
 136
 137                 return $page;
 138         }
 139
 140         /**
 141          * Constructor from a page id
 142          *
 143          * @param $id Int article ID to load
 144          * @param $from string|int one of the following values:
 145          *        - "fromdb" or self::DATA_FROM_SLAVE to select from a slave database
 146          *        - "fromdbmaster" or self::DATA_FROM_MASTER to select from the master database
 147          *
 148          * @return WikiPage|null
 149          */
 150         public static function newFromID( $id, $from = 'fromdb' ) {
 151                 $from = self::convertSelectType( $from );
 152                 $db = wfGetDB( $from === self::DATA_FROM_MASTER ? DB_MASTER : DB_SLAVE );
 153                 $row = $db->selectRow( 'page', self::selectFields(), array( 'page_id' => $id ), __METHOD__ );
 154                 if ( !$row ) {
 155                         return null;
 156                 }
 157                 return self::newFromRow( $row, $from );
 158         }
 159
 160         /**
 161          * Constructor from a database row
 162          *
 163          * @since 1.20
 164          * @param $row object: database row containing at least fields returned
 165          *        by selectFields().
 166          * @param $from string|int: source of $data:
 167          *        - "fromdb" or self::DATA_FROM_SLAVE: from a slave DB
 168          *        - "fromdbmaster" or self::DATA_FROM_MASTER: from the master DB
 169          *        - "forupdate" or self::DATA_FOR_UPDATE: from the master DB using SELECT FOR UPDATE
 170          * @return WikiPage
 171          */
 172         public static function newFromRow( $row, $from = 'fromdb' ) {
 173                 $page = self::factory( Title::newFromRow( $row ) );
 174                 $page->loadFromRow( $row, $from );
 175                 return $page;
 176         }
 177
 178         /**
 179          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to DATA_* constants.
 180          *
 181          * @param $type object|string|int
 182          * @return mixed
 183          */
 184         private static function convertSelectType( $type ) {
 185                 switch ( $type ) {
 186                 case 'fromdb':
 187                         return self::DATA_FROM_SLAVE;
 188                 case 'fromdbmaster':
 189                         return self::DATA_FROM_MASTER;
 190                 case 'forupdate':
 191                         return self::DATA_FOR_UPDATE;
 192                 default:
 193                         // It may already be an integer or whatever else
 194                         return $type;
 195                 }
 196         }
 197
 198         /**
 199          * Returns overrides for action handlers.
 200          * Classes listed here will be used instead of the default one when
 201          * (and only when) $wgActions[$action] === true. This allows subclasses
 202          * to override the default behavior.
 203          *
 204          * @todo: move this UI stuff somewhere else
 205          *
 206          * @return Array
 207          */
 208         public function getActionOverrides() {
 209                 $content_handler = $this->getContentHandler();
 210                 return $content_handler->getActionOverrides();
 211         }
 212
 213         /**
 214          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 215          *
 216          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 217          *
 218          * @return ContentHandler
 219          *
 220          * @since 1.WD
 221          */
 222         public function getContentHandler() {
 223                 return ContentHandler::getForModelID( $this->getContentModel() );
 224         }
 225
 226         /**
 227          * Get the title object of the article
 228          * @return Title object of this page
 229          */
 230         public function getTitle() {
 231                 return $this->mTitle;
 232         }
 233
 234         /**
 235          * Clear the object
 236          * @return void
 237          */
 238         public function clear() {
 239                 $this->mDataLoaded = false;
 240                 $this->mDataLoadedFrom = self::DATA_NOT_LOADED;
 241
 242                 $this->clearCacheFields();
 243         }
 244
 245         /**
 246          * Clear the object cache fields
 247          * @return void
 248          */
 249         protected function clearCacheFields() {
 250                 $this->mCounter = null;
 251                 $this->mRedirectTarget = null; # Title object if set
 252                 $this->mLastRevision = null; # Latest revision
 253                 $this->mTouched = '19700101000000';
 254                 $this->mTimestamp = '';
 255                 $this->mIsRedirect = false;
 256                 $this->mLatest = false;
 257                 $this->mPreparedEdit = false;
 258         }
 259
 260         /**
 261          * Return the list of revision fields that should be selected to create
 262          * a new page.
 263          *
 264          * @return array
 265          */
 266         public static function selectFields() {
 267                 global $wgContentHandlerUseDB;
 268
 269                 $fields = array(
 270                         'page_id',
 271                         'page_namespace',
 272                         'page_title',
 273                         'page_restrictions',
 274                         'page_counter',
 275                         'page_is_redirect',
 276                         'page_is_new',
 277                         'page_random',
 278                         'page_touched',
 279                         'page_latest',
 280                         'page_len',
 281                 );
 282
 283                 if ( $wgContentHandlerUseDB ) {
 284                         $fields[] = 'page_content_model';
 285                 }
 286
 287                 return $fields;
 288         }
 289
 290         /**
 291          * Fetch a page record with the given conditions
 292          * @param $dbr DatabaseBase object
 293          * @param $conditions Array
 294          * @param $options Array
 295          * @return mixed Database result resource, or false on failure
 296          */
 297         protected function pageData( $dbr, $conditions, $options = array() ) {
 298                 $fields = self::selectFields();
 299
 300                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 301
 302                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 303
 304                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 305
 306                 return $row;
 307         }
 308
 309         /**
 310          * Fetch a page record matching the Title object's namespace and title
 311          * using a sanitized title string
 312          *
 313          * @param $dbr DatabaseBase object
 314          * @param $title Title object
 315          * @param $options Array
 316          * @return mixed Database result resource, or false on failure
 317          */
 318         public function pageDataFromTitle( $dbr, $title, $options = array() ) {
 319                 return $this->pageData( $dbr, array(
 320                         'page_namespace' => $title->getNamespace(),
 321                         'page_title'     => $title->getDBkey() ), $options );
 322         }
 323
 324         /**
 325          * Fetch a page record matching the requested ID
 326          *
 327          * @param $dbr DatabaseBase
 328          * @param $id Integer
 329          * @param $options Array
 330          * @return mixed Database result resource, or false on failure
 331          */
 332         public function pageDataFromId( $dbr, $id, $options = array() ) {
 333                 return $this->pageData( $dbr, array( 'page_id' => $id ), $options );
 334         }
 335
 336         /**
 337          * Set the general counter, title etc data loaded from
 338          * some source.
 339          *
 340          * @param $from object|string|int One of the following:
 341          *        - A DB query result object
 342          *        - "fromdb" or self::DATA_FROM_SLAVE to get from a slave DB
 343          *        - "fromdbmaster" or self::DATA_FROM_MASTER to get from the master DB
 344          *        - "forupdate"  or self::DATA_FOR_UPDATE to get from the master DB using SELECT FOR UPDATE
 345          *
 346          * @return void
 347          */
 348         public function loadPageData( $from = 'fromdb' ) {
 349                 $from = self::convertSelectType( $from );
 350                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 351                         // We already have the data from the correct location, no need to load it twice.
 352                         return;
 353                 }
 354
 355                 if ( $from === self::DATA_FOR_UPDATE ) {
 356                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle, array( 'FOR UPDATE' ) );
 357                 } elseif ( $from === self::DATA_FROM_MASTER ) {
 358                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 359                 } elseif ( $from === self::DATA_FROM_SLAVE ) {
 360                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 361                         # Use a "last rev inserted" timestamp key to dimish the issue of slave lag.
 362                         # Note that DB also stores the master position in the session and checks it.
 363                         $touched = $this->getCachedLastEditTime();
 364                         if ( $touched ) { // key set
 365                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 366                                         $from = self::DATA_FROM_MASTER;
 367                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 368                                 }
 369                         }
 370                 } else {
 371                         // No idea from where the caller got this data, assume slave database.
 372                         $data = $from;
 373                         $from = self::DATA_FROM_SLAVE;
 374                 }
 375
 376                 $this->loadFromRow( $data, $from );
 377         }
 378
 379         /**
 380          * Load the object from a database row
 381          *
 382          * @since 1.20
 383          * @param $data object: database row containing at least fields returned
 384          *        by selectFields()
 385          * @param $from string|int One of the following:
 386          *        - "fromdb" or self::DATA_FROM_SLAVE if the data comes from a slave DB
 387          *        - "fromdbmaster" or self::DATA_FROM_MASTER if the data comes from the master DB
 388          *        - "forupdate"  or self::DATA_FOR_UPDATE if the data comes from from
 389          *          the master DB using SELECT FOR UPDATE
 390          */
 391         public function loadFromRow( $data, $from ) {
 392                 $lc = LinkCache::singleton();
 393
 394                 if ( $data ) {
 395                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 396
 397                         $this->mTitle->loadFromRow( $data );
 398
 399                         # Old-fashioned restrictions
 400                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 401
 402                         $this->mCounter     = intval( $data->page_counter );
 403                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 404                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 405                         $this->mLatest      = intval( $data->page_latest );
 406                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 407                         // Double-check the ID of any cached latest Revision object for consistency.
 408                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 409                                 $this->mLastRevision = null;
 410                                 $this->mTimestamp = '';
 411                         }
 412                 } else {
 413                         $lc->addBadLinkObj( $this->mTitle );
 414
 415                         $this->mTitle->loadFromRow( false );
 416
 417                         $this->clearCacheFields();
 418                 }
 419
 420                 $this->mDataLoaded = true;
 421                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 422         }
 423
 424         /**
 425          * @return int Page ID
 426          */
 427         public function getId() {
 428                 return $this->mTitle->getArticleID();
 429         }
 430
 431         /**
 432          * @return bool Whether or not the page exists in the database
 433          */
 434         public function exists() {
 435                 return $this->mTitle->exists();
 436         }
 437
 438         /**
 439          * Check if this page is something we're going to be showing
 440          * some sort of sensible content for. If we return false, page
 441          * views (plain action=view) will return an HTTP 404 response,
 442          * so spiders and robots can know they're following a bad link.
 443          *
 444          * @return bool
 445          */
 446         public function hasViewableContent() {
 447                 return $this->mTitle->exists() || $this->mTitle->isAlwaysKnown();
 448         }
 449
 450         /**
 451          * @return int The view count for the page
 452          */
 453         public function getCount() {
 454                 if ( !$this->mDataLoaded ) {
 455                         $this->loadPageData();
 456                 }
 457
 458                 return $this->mCounter;
 459         }
 460
 461         /**
 462          * Tests if the article content represents a redirect
 463          *
 464          * @return bool
 465          */
 466         public function isRedirect( ) {
 467                 $content = $this->getContent();
 468                 if ( !$content ) return false;
 469
 470                 return $content->isRedirect();
 471         }
 472
 473         /**
 474          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 475          *
 476          * Will use the revisions actual content model if the page exists,
 477          * and the page's default if the page doesn't exist yet.
 478          *
 479          * @return String
 480          *
 481          * @since 1.WD
 482          */
 483         public function getContentModel() {
 484                 if ( $this->exists() ) {
 485                         # look at the revision's actual content model
 486                         $rev = $this->getRevision();
 487
 488                         if ( $rev !== null ) {
 489                                 return $rev->getContentModel();
 490                         } else {
 491                                 wfWarn( "Page exists but has no revision!" );
 492                         }
 493                 }
 494
 495                 # use the default model for this page
 496                 return $this->mTitle->getContentModel();
 497         }
 498
 499         /**
 500          * Loads page_touched and returns a value indicating if it should be used
 501          * @return boolean true if not a redirect
 502          */
 503         public function checkTouched() {
 504                 if ( !$this->mDataLoaded ) {
 505                         $this->loadPageData();
 506                 }
 507                 return !$this->mIsRedirect;
 508         }
 509
 510         /**
 511          * Get the page_touched field
 512          * @return string containing GMT timestamp
 513          */
 514         public function getTouched() {
 515                 if ( !$this->mDataLoaded ) {
 516                         $this->loadPageData();
 517                 }
 518                 return $this->mTouched;
 519         }
 520
 521         /**
 522          * Get the page_latest field
 523          * @return integer rev_id of current revision
 524          */
 525         public function getLatest() {
 526                 if ( !$this->mDataLoaded ) {
 527                         $this->loadPageData();
 528                 }
 529                 return (int)$this->mLatest;
 530         }
 531
 532         /**
 533          * Get the Revision object of the oldest revision
 534          * @return Revision|null
 535          */
 536         public function getOldestRevision() {
 537                 wfProfileIn( __METHOD__ );
 538
 539                 // Try using the slave database first, then try the master
 540                 $continue = 2;
 541                 $db = wfGetDB( DB_SLAVE );
 542                 $revSelectFields = Revision::selectFields();
 543
 544                 while ( $continue ) {
 545                         $row = $db->selectRow(
 546                                 array( 'page', 'revision' ),
 547                                 $revSelectFields,
 548                                 array(
 549                                         'page_namespace' => $this->mTitle->getNamespace(),
 550                                         'page_title' => $this->mTitle->getDBkey(),
 551                                         'rev_page = page_id'
 552                                 ),
 553                                 __METHOD__,
 554                                 array(
 555                                         'ORDER BY' => 'rev_timestamp ASC'
 556                                 )
 557                         );
 558
 559                         if ( $row ) {
 560                                 $continue = 0;
 561                         } else {
 562                                 $db = wfGetDB( DB_MASTER );
 563                                 $continue--;
 564                         }
 565                 }
 566
 567                 wfProfileOut( __METHOD__ );
 568                 return $row ? Revision::newFromRow( $row ) : null;
 569         }
 570
 571         /**
 572          * Loads everything except the text
 573          * This isn't necessary for all uses, so it's only done if needed.
 574          */
 575         protected function loadLastEdit() {
 576                 if ( $this->mLastRevision !== null ) {
 577                         return; // already loaded
 578                 }
 579
 580                 $latest = $this->getLatest();
 581                 if ( !$latest ) {
 582                         return; // page doesn't exist or is missing page_latest info
 583                 }
 584
 585                 // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always includes the
 586                 // latest changes committed. This is true even within REPEATABLE-READ transactions, where
 587                 // S1 normally only sees changes committed before the first S1 SELECT. Thus we need S1 to
 588                 // also gets the revision row FOR UPDATE; otherwise, it may not find it since a page row
 589                 // UPDATE and revision row INSERT by S2 may have happened after the first S1 SELECT.
 590                 // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read.
 591                 $flags = ( $this->mDataLoadedFrom == self::DATA_FOR_UPDATE ) ? Revision::LOCKING_READ : 0;
 592                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 593                 if ( $revision ) { // sanity
 594                         $this->setLastEdit( $revision );
 595                 }
 596         }
 597
 598         /**
 599          * Set the latest revision
 600          */
 601         protected function setLastEdit( Revision $revision ) {
 602                 $this->mLastRevision = $revision;
 603                 $this->mTimestamp = $revision->getTimestamp();
 604         }
 605
 606         /**
 607          * Get the latest revision
 608          * @return Revision|null
 609          */
 610         public function getRevision() {
 611                 $this->loadLastEdit();
 612                 if ( $this->mLastRevision ) {
 613                         return $this->mLastRevision;
 614                 }
 615                 return null;
 616         }
 617
 618         /**
 619          * Get the content 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 Content|null The content of the current revision
 626          *
 627          * @since 1.WD
 628          */
 629         public function getContent( $audience = Revision::FOR_PUBLIC ) {
 630                 $this->loadLastEdit();
 631                 if ( $this->mLastRevision ) {
 632                         return $this->mLastRevision->getContent( $audience );
 633                 }
 634                 return null;
 635         }
 636
 637         /**
 638          * Get the text of the current revision. No side-effects...
 639          *
 640          * @param $audience Integer: one of:
 641          *      Revision::FOR_PUBLIC       to be displayed to all users
 642          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 643          *      Revision::RAW              get the text regardless of permissions
 644          * @return String|false The text of the current revision
 645          * @deprecated as of 1.WD, getContent() should be used instead.
 646          */
 647         public function getText( $audience = Revision::FOR_PUBLIC ) { #@todo: deprecated, replace usage!
 648                 wfDeprecated( __METHOD__, '1.WD' );
 649
 650                 $this->loadLastEdit();
 651                 if ( $this->mLastRevision ) {
 652                         return $this->mLastRevision->getText( $audience );
 653                 }
 654                 return false;
 655         }
 656
 657         /**
 658          * Get the text of the current revision. No side-effects...
 659          *
 660          * @return String|bool The text of the current revision. False on failure
 661          * @deprecated as of 1.WD, getContent() should be used instead.
 662          */
 663         public function getRawText() {
 664                 wfDeprecated( __METHOD__, '1.WD' );
 665
 666                 return $this->getText( Revision::RAW );
 667         }
 668
 669         /**
 670          * @return string MW timestamp of last article revision
 671          */
 672         public function getTimestamp() {
 673                 // Check if the field has been filled by WikiPage::setTimestamp()
 674                 if ( !$this->mTimestamp ) {
 675                         $this->loadLastEdit();
 676                 }
 677
 678                 return wfTimestamp( TS_MW, $this->mTimestamp );
 679         }
 680
 681         /**
 682          * Set the page timestamp (use only to avoid DB queries)
 683          * @param $ts string MW timestamp of last article revision
 684          * @return void
 685          */
 686         public function setTimestamp( $ts ) {
 687                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 688         }
 689
 690         /**
 691          * @param $audience Integer: one of:
 692          *      Revision::FOR_PUBLIC       to be displayed to all users
 693          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 694          *      Revision::RAW              get the text regardless of permissions
 695          * @return int user ID for the user that made the last article revision
 696          */
 697         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 698                 $this->loadLastEdit();
 699                 if ( $this->mLastRevision ) {
 700                         return $this->mLastRevision->getUser( $audience );
 701                 } else {
 702                         return -1;
 703                 }
 704         }
 705
 706         /**
 707          * Get the User object of the user who created the page
 708          * @param $audience Integer: one of:
 709          *      Revision::FOR_PUBLIC       to be displayed to all users
 710          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 711          *      Revision::RAW              get the text regardless of permissions
 712          * @return User|null
 713          */
 714         public function getCreator( $audience = Revision::FOR_PUBLIC ) {
 715                 $revision = $this->getOldestRevision();
 716                 if ( $revision ) {
 717                         $userName = $revision->getUserText( $audience );
 718                         return User::newFromName( $userName, false );
 719                 } else {
 720                         return null;
 721                 }
 722         }
 723
 724         /**
 725          * @param $audience Integer: one of:
 726          *      Revision::FOR_PUBLIC       to be displayed to all users
 727          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 728          *      Revision::RAW              get the text regardless of permissions
 729          * @return string username of the user that made the last article revision
 730          */
 731         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 732                 $this->loadLastEdit();
 733                 if ( $this->mLastRevision ) {
 734                         return $this->mLastRevision->getUserText( $audience );
 735                 } else {
 736                         return '';
 737                 }
 738         }
 739
 740         /**
 741          * @param $audience Integer: one of:
 742          *      Revision::FOR_PUBLIC       to be displayed to all users
 743          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 744          *      Revision::RAW              get the text regardless of permissions
 745          * @return string Comment stored for the last article revision
 746          */
 747         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 748                 $this->loadLastEdit();
 749                 if ( $this->mLastRevision ) {
 750                         return $this->mLastRevision->getComment( $audience );
 751                 } else {
 752                         return '';
 753                 }
 754         }
 755
 756         /**
 757          * Returns true if last revision was marked as "minor edit"
 758          *
 759          * @return boolean Minor edit indicator for the last article revision.
 760          */
 761         public function getMinorEdit() {
 762                 $this->loadLastEdit();
 763                 if ( $this->mLastRevision ) {
 764                         return $this->mLastRevision->isMinor();
 765                 } else {
 766                         return false;
 767                 }
 768         }
 769
 770         /**
 771          * Get the cached timestamp for the last time the page changed.
 772          * This is only used to help handle slave lag by comparing to page_touched.
 773          * @return string MW timestamp
 774          */
 775         protected function getCachedLastEditTime() {
 776                 global $wgMemc;
 777                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 778                 return $wgMemc->get( $key );
 779         }
 780
 781         /**
 782          * Set the cached timestamp for the last time the page changed.
 783          * This is only used to help handle slave lag by comparing to page_touched.
 784          * @param $timestamp string
 785          * @return void
 786          */
 787         public function setCachedLastEditTime( $timestamp ) {
 788                 global $wgMemc;
 789                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 790                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 791         }
 792
 793         /**
 794          * Determine whether a page would be suitable for being counted as an
 795          * article in the site_stats table based on the title & its content
 796          *
 797          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 798          *        if false, the current database state will be used
 799          * @return Boolean
 800          */
 801         public function isCountable( $editInfo = false ) {
 802                 global $wgArticleCountMethod;
 803
 804                 if ( !$this->mTitle->isContentPage() ) {
 805                         return false;
 806                 }
 807
 808                 if ( $editInfo ) {
 809                         $content = $editInfo->pstContent;
 810                 } else {
 811                         $content = $this->getContent();
 812                 }
 813
 814                 if ( !$content || $content->isRedirect( ) ) {
 815                         return false;
 816                 }
 817
 818                 $hasLinks = null;
 819
 820                 if ( $wgArticleCountMethod === 'link' ) {
 821                         # nasty special case to avoid re-parsing to detect links
 822
 823                         if ( $editInfo ) {
 824                                 // ParserOutput::getLinks() is a 2D array of page links, so
 825                                 // to be really correct we would need to recurse in the array
 826                                 // but the main array should only have items in it if there are
 827                                 // links.
 828                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 829                         } else {
 830                                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 831                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 832                         }
 833                 }
 834
 835                 return $content->isCountable( $hasLinks );
 836         }
 837
 838         /**
 839          * If this page is a redirect, get its target
 840          *
 841          * The target will be fetched from the redirect table if possible.
 842          * If this page doesn't have an entry there, call insertRedirect()
 843          * @return Title|mixed object, or null if this page is not a redirect
 844          */
 845         public function getRedirectTarget() {
 846                 if ( !$this->mTitle->isRedirect() ) {
 847                         return null;
 848                 }
 849
 850                 if ( $this->mRedirectTarget !== null ) {
 851                         return $this->mRedirectTarget;
 852                 }
 853
 854                 # Query the redirect table
 855                 $dbr = wfGetDB( DB_SLAVE );
 856                 $row = $dbr->selectRow( 'redirect',
 857                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 858                         array( 'rd_from' => $this->getId() ),
 859                         __METHOD__
 860                 );
 861
 862                 // rd_fragment and rd_interwiki were added later, populate them if empty
 863                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 864                         return $this->mRedirectTarget = Title::makeTitle(
 865                                 $row->rd_namespace, $row->rd_title,
 866                                 $row->rd_fragment, $row->rd_interwiki );
 867                 }
 868
 869                 # This page doesn't have an entry in the redirect table
 870                 return $this->mRedirectTarget = $this->insertRedirect();
 871         }
 872
 873         /**
 874          * Insert an entry for this page into the redirect table.
 875          *
 876          * Don't call this function directly unless you know what you're doing.
 877          * @return Title object or null if not a redirect
 878          */
 879         public function insertRedirect() {
 880                 // recurse through to only get the final target
 881                 $content = $this->getContent();
 882                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 883                 if ( !$retval ) {
 884                         return null;
 885                 }
 886                 $this->insertRedirectEntry( $retval );
 887                 return $retval;
 888         }
 889
 890         /**
 891          * Insert or update the redirect table entry for this page to indicate
 892          * it redirects to $rt .
 893          * @param $rt Title redirect target
 894          */
 895         public function insertRedirectEntry( $rt ) {
 896                 $dbw = wfGetDB( DB_MASTER );
 897                 $dbw->replace( 'redirect', array( 'rd_from' ),
 898                         array(
 899                                 'rd_from'      => $this->getId(),
 900                                 'rd_namespace' => $rt->getNamespace(),
 901                                 'rd_title'     => $rt->getDBkey(),
 902                                 'rd_fragment'  => $rt->getFragment(),
 903                                 'rd_interwiki' => $rt->getInterwiki(),
 904                         ),
 905                         __METHOD__
 906                 );
 907         }
 908
 909         /**
 910          * Get the Title object or URL this page redirects to
 911          *
 912          * @return mixed false, Title of in-wiki target, or string with URL
 913          */
 914         public function followRedirect() {
 915                 return $this->getRedirectURL( $this->getRedirectTarget() );
 916         }
 917
 918         /**
 919          * Get the Title object or URL to use for a redirect. We use Title
 920          * objects for same-wiki, non-special redirects and URLs for everything
 921          * else.
 922          * @param $rt Title Redirect target
 923          * @return mixed false, Title object of local target, or string with URL
 924          */
 925         public function getRedirectURL( $rt ) {
 926                 if ( !$rt ) {
 927                         return false;
 928                 }
 929
 930                 if ( $rt->isExternal() ) {
 931                         if ( $rt->isLocal() ) {
 932                                 // Offsite wikis need an HTTP redirect.
 933                                 //
 934                                 // This can be hard to reverse and may produce loops,
 935                                 // so they may be disabled in the site configuration.
 936                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 937                                 return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 938                         } else {
 939                                 // External pages pages without "local" bit set are not valid
 940                                 // redirect targets
 941                                 return false;
 942                         }
 943                 }
 944
 945                 if ( $rt->isSpecialPage() ) {
 946                         // Gotta handle redirects to special pages differently:
 947                         // Fill the HTTP response "Location" header and ignore
 948                         // the rest of the page we're on.
 949                         //
 950                         // Some pages are not valid targets
 951                         if ( $rt->isValidRedirectTarget() ) {
 952                                 return $rt->getFullURL();
 953                         } else {
 954                                 return false;
 955                         }
 956                 }
 957
 958                 return $rt;
 959         }
 960
 961         /**
 962          * Get a list of users who have edited this article, not including the user who made
 963          * the most recent revision, which you can get from $article->getUser() if you want it
 964          * @return UserArrayFromResult
 965          */
 966         public function getContributors() {
 967                 # @todo FIXME: This is expensive; cache this info somewhere.
 968
 969                 $dbr = wfGetDB( DB_SLAVE );
 970
 971                 if ( $dbr->implicitGroupby() ) {
 972                         $realNameField = 'user_real_name';
 973                 } else {
 974                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 975                 }
 976
 977                 $tables = array( 'revision', 'user' );
 978
 979                 $fields = array(
 980                         'rev_user as user_id',
 981                         'rev_user_text AS user_name',
 982                         $realNameField,
 983                         'MAX(rev_timestamp) AS timestamp',
 984                 );
 985
 986                 $conds = array( 'rev_page' => $this->getId() );
 987
 988                 // The user who made the top revision gets credited as "this page was last edited by
 989                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 990                 $user = $this->getUser();
 991                 if ( $user ) {
 992                         $conds[] = "rev_user != $user";
 993                 } else {
 994                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 995                 }
 996
 997                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 998
 999                 $jconds = array(
1000                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
1001                 );
1002
1003                 $options = array(
1004                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
1005                         'ORDER BY' => 'timestamp DESC',
1006                 );
1007
1008                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1009                 return new UserArrayFromResult( $res );
1010         }
1011
1012         /**
1013          * Get the last N authors
1014          * @param $num Integer: number of revisions to get
1015          * @param $revLatest String: the latest rev_id, selected from the master (optional)
1016          * @return array Array of authors, duplicates not removed
1017          */
1018         public function getLastNAuthors( $num, $revLatest = 0 ) {
1019                 wfProfileIn( __METHOD__ );
1020                 // First try the slave
1021                 // If that doesn't have the latest revision, try the master
1022                 $continue = 2;
1023                 $db = wfGetDB( DB_SLAVE );
1024
1025                 do {
1026                         $res = $db->select( array( 'page', 'revision' ),
1027                                 array( 'rev_id', 'rev_user_text' ),
1028                                 array(
1029                                         'page_namespace' => $this->mTitle->getNamespace(),
1030                                         'page_title' => $this->mTitle->getDBkey(),
1031                                         'rev_page = page_id'
1032                                 ), __METHOD__,
1033                                 array(
1034                                         'ORDER BY' => 'rev_timestamp DESC',
1035                                         'LIMIT' => $num
1036                                 )
1037                         );
1038
1039                         if ( !$res ) {
1040                                 wfProfileOut( __METHOD__ );
1041                                 return array();
1042                         }
1043
1044                         $row = $db->fetchObject( $res );
1045
1046                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1047                                 $db = wfGetDB( DB_MASTER );
1048                                 $continue--;
1049                         } else {
1050                                 $continue = 0;
1051                         }
1052                 } while ( $continue );
1053
1054                 $authors = array( $row->rev_user_text );
1055
1056                 foreach ( $res as $row ) {
1057                         $authors[] = $row->rev_user_text;
1058                 }
1059
1060                 wfProfileOut( __METHOD__ );
1061                 return $authors;
1062         }
1063
1064         /**
1065          * Should the parser cache be used?
1066          *
1067          * @param $parserOptions ParserOptions to check
1068          * @param $oldid int
1069          * @return boolean
1070          */
1071         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
1072                 global $wgEnableParserCache;
1073
1074                 return $wgEnableParserCache
1075                         && $parserOptions->getStubThreshold() == 0
1076                         && $this->mTitle->exists()
1077                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
1078                         && $this->getContentHandler()->isParserCacheSupported();
1079         }
1080
1081         /**
1082          * Get a ParserOutput for the given ParserOptions and revision ID.
1083          * The parser cache will be used if possible.
1084          *
1085          * @since 1.19
1086          * @param $parserOptions ParserOptions to use for the parse operation
1087          * @param $oldid Revision ID to get the text from, passing null or 0 will
1088          *               get the current revision (default value)
1089          *
1090          * @return ParserOutput or false if the revision was not found
1091          */
1092         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
1093                 wfProfileIn( __METHOD__ );
1094
1095                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
1096                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1097                 if ( $parserOptions->getStubThreshold() ) {
1098                         wfIncrStats( 'pcache_miss_stub' );
1099                 }
1100
1101                 if ( $useParserCache ) {
1102                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1103                         if ( $parserOutput !== false ) {
1104                                 wfProfileOut( __METHOD__ );
1105                                 return $parserOutput;
1106                         }
1107                 }
1108
1109                 if ( $oldid === null || $oldid === 0 ) {
1110                         $oldid = $this->getLatest();
1111                 }
1112
1113                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1114                 $pool->execute();
1115
1116                 wfProfileOut( __METHOD__ );
1117
1118                 return $pool->getParserOutput();
1119         }
1120
1121         /**
1122          * Do standard deferred updates after page view
1123          * @param $user User The relevant user
1124          */
1125         public function doViewUpdates( User $user ) {
1126                 global $wgDisableCounters;
1127                 if ( wfReadOnly() ) {
1128                         return;
1129                 }
1130
1131                 # Don't update page view counters on views from bot users (bug 14044)
1132                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->mTitle->exists() ) {
1133                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1134                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1135                 }
1136
1137                 # Update newtalk / watchlist notification status
1138                 $user->clearNotification( $this->mTitle );
1139         }
1140
1141         /**
1142          * Perform the actions of a page purging
1143          * @return bool
1144          */
1145         public function doPurge() {
1146                 global $wgUseSquid;
1147
1148                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
1149                         return false;
1150                 }
1151
1152                 // Invalidate the cache
1153                 $this->mTitle->invalidateCache();
1154                 $this->clear();
1155
1156                 if ( $wgUseSquid ) {
1157                         // Commit the transaction before the purge is sent
1158                         $dbw = wfGetDB( DB_MASTER );
1159                         $dbw->commit( __METHOD__ );
1160
1161                         // Send purge
1162                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1163                         $update->doUpdate();
1164                 }
1165
1166                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1167                         //@todo: move this logic to MessageCache
1168
1169                         if ( $this->mTitle->exists() ) {
1170                                 // NOTE: use transclusion text for messages.
1171                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1172
1173                                 $content = $this->getContent();
1174                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1175
1176                                 if ( $text === null ) $text = false;
1177                         } else {
1178                                 $text = false;
1179                         }
1180
1181                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1182                 }
1183                 return true;
1184         }
1185
1186         /**
1187          * Insert a new empty page record for this article.
1188          * This *must* be followed up by creating a revision
1189          * and running $this->updateRevisionOn( ... );
1190          * or else the record will be left in a funky state.
1191          * Best if all done inside a transaction.
1192          *
1193          * @param $dbw DatabaseBase
1194          * @return int The newly created page_id key, or false if the title already existed
1195          */
1196         public function insertOn( $dbw ) {
1197                 wfProfileIn( __METHOD__ );
1198
1199                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1200                 $dbw->insert( 'page', array(
1201                         'page_id'           => $page_id,
1202                         'page_namespace'    => $this->mTitle->getNamespace(),
1203                         'page_title'        => $this->mTitle->getDBkey(),
1204                         'page_counter'      => 0,
1205                         'page_restrictions' => '',
1206                         'page_is_redirect'  => 0, # Will set this shortly...
1207                         'page_is_new'       => 1,
1208                         'page_random'       => wfRandom(),
1209                         'page_touched'      => $dbw->timestamp(),
1210                         'page_latest'       => 0, # Fill this in shortly...
1211                         'page_len'          => 0, # Fill this in shortly...
1212                 ), __METHOD__, 'IGNORE' );
1213
1214                 $affected = $dbw->affectedRows();
1215
1216                 if ( $affected ) {
1217                         $newid = $dbw->insertId();
1218                         $this->mTitle->resetArticleID( $newid );
1219                 }
1220                 wfProfileOut( __METHOD__ );
1221
1222                 return $affected ? $newid : false;
1223         }
1224
1225         /**
1226          * Update the page record to point to a newly saved revision.
1227          *
1228          * @param $dbw DatabaseBase: object
1229          * @param $revision Revision: For ID number, and text used to set
1230          *                  length and redirect status fields
1231          * @param $lastRevision Integer: if given, will not overwrite the page field
1232          *                      when different from the currently set value.
1233          *                      Giving 0 indicates the new page flag should be set
1234          *                      on.
1235          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1236          *                           removing rows in redirect table.
1237          * @return bool true on success, false on failure
1238          * @private
1239          */
1240         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1241                 global $wgContentHandlerUseDB;
1242
1243                 wfProfileIn( __METHOD__ );
1244
1245                 $content = $revision->getContent();
1246                 $len = $content->getSize();
1247                 $rt = $content->getUltimateRedirectTarget();
1248
1249                 $conditions = array( 'page_id' => $this->getId() );
1250
1251                 if ( !is_null( $lastRevision ) ) {
1252                         # An extra check against threads stepping on each other
1253                         $conditions['page_latest'] = $lastRevision;
1254                 }
1255
1256                 $now = wfTimestampNow();
1257                 $row = array( /* SET */
1258                         'page_latest'      => $revision->getId(),
1259                         'page_touched'     => $dbw->timestamp( $now ),
1260                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1261                         'page_is_redirect' => $rt !== null ? 1 : 0,
1262                         'page_len'         => $len,
1263                 );
1264
1265                 if ( $wgContentHandlerUseDB ) {
1266                         $row[ 'page_content_model' ] = $revision->getContentModel();
1267                 }
1268
1269                 $dbw->update( 'page',
1270                         $row,
1271                         $conditions,
1272                         __METHOD__ );
1273
1274                 $result = $dbw->affectedRows() > 0;
1275                 if ( $result ) {
1276                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1277                         $this->setLastEdit( $revision );
1278                         $this->setCachedLastEditTime( $now );
1279                         $this->mLatest = $revision->getId();
1280                         $this->mIsRedirect = (bool)$rt;
1281                         # Update the LinkCache.
1282                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect, $this->mLatest, $revision->getContentModel() );
1283                 }
1284
1285                 wfProfileOut( __METHOD__ );
1286                 return $result;
1287         }
1288
1289         /**
1290          * Add row to the redirect table if this is a redirect, remove otherwise.
1291          *
1292          * @param $dbw DatabaseBase
1293          * @param $redirectTitle Title object pointing to the redirect target,
1294          *                       or NULL if this is not a redirect
1295          * @param $lastRevIsRedirect null|bool If given, will optimize adding and
1296          *                           removing rows in redirect table.
1297          * @return bool true on success, false on failure
1298          * @private
1299          */
1300         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1301                 // Always update redirects (target link might have changed)
1302                 // Update/Insert if we don't know if the last revision was a redirect or not
1303                 // Delete if changing from redirect to non-redirect
1304                 $isRedirect = !is_null( $redirectTitle );
1305
1306                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1307                         return true;
1308                 }
1309
1310                 wfProfileIn( __METHOD__ );
1311                 if ( $isRedirect ) {
1312                         $this->insertRedirectEntry( $redirectTitle );
1313                 } else {
1314                         // This is not a redirect, remove row from redirect table
1315                         $where = array( 'rd_from' => $this->getId() );
1316                         $dbw->delete( 'redirect', $where, __METHOD__ );
1317                 }
1318
1319                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1320                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1321                 }
1322                 wfProfileOut( __METHOD__ );
1323
1324                 return ( $dbw->affectedRows() != 0 );
1325         }
1326
1327         /**
1328          * If the given revision is newer than the currently set page_latest,
1329          * update the page record. Otherwise, do nothing.
1330          *
1331          * @param $dbw DatabaseBase object
1332          * @param $revision Revision object
1333          * @return mixed
1334          */
1335         public function updateIfNewerOn( $dbw, $revision ) {
1336                 wfProfileIn( __METHOD__ );
1337
1338                 $row = $dbw->selectRow(
1339                         array( 'revision', 'page' ),
1340                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1341                         array(
1342                                 'page_id' => $this->getId(),
1343                                 'page_latest=rev_id' ),
1344                         __METHOD__ );
1345
1346                 if ( $row ) {
1347                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1348                                 wfProfileOut( __METHOD__ );
1349                                 return false;
1350                         }
1351                         $prev = $row->rev_id;
1352                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1353                 } else {
1354                         # No or missing previous revision; mark the page as new
1355                         $prev = 0;
1356                         $lastRevIsRedirect = null;
1357                 }
1358
1359                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1360
1361                 wfProfileOut( __METHOD__ );
1362                 return $ret;
1363         }
1364
1365     /**
1366      * Get the content that needs to be saved in order to undo all revisions
1367      * between $undo and $undoafter. Revisions must belong to the same page,
1368      * must exist and must not be deleted
1369      * @param $undo Revision
1370      * @param $undoafter Revision Must be an earlier revision than $undo
1371      * @return mixed string on success, false on failure
1372      * @since 1.WD
1373      * Before we had the Content object, this was done in getUndoText
1374      */
1375     public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1376         $handler = $undo->getContentHandler();
1377         return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1378     }
1379
1380         /**
1381          * Get the text that needs to be saved in order to undo all revisions
1382          * between $undo and $undoafter. Revisions must belong to the same page,
1383          * must exist and must not be deleted
1384          * @param $undo Revision
1385          * @param $undoafter Revision Must be an earlier revision than $undo
1386          * @return mixed string on success, false on failure
1387          * @deprecated since 1.WD: use ContentHandler::getUndoContent() instead.
1388          */
1389         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1390                 wfDeprecated( __METHOD__, '1.WD' );
1391
1392                 $this->loadLastEdit();
1393
1394                 if ( $this->mLastRevision ) {
1395                         if ( is_null( $undoafter ) ) {
1396                                 $undoafter = $undo->getPrevious();
1397                         }
1398
1399                         $handler = $this->getContentHandler();
1400                         $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1401
1402                         if ( !$undone ) {
1403                                 return false;
1404                         } else {
1405                                 return ContentHandler::getContentText( $undone );
1406                         }
1407                 }
1408
1409                 return false;
1410         }
1411
1412         /**
1413          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1414          * @param $text String: new text of the section
1415          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1416          * @param $edittime String: revision timestamp or null to use the current revision
1417          * @return String new complete article text, or null if error
1418          *
1419          * @deprecated since 1.WD, use replaceSectionContent() instead
1420          */
1421         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) {
1422                 wfDeprecated( __METHOD__, '1.WD' );
1423
1424                 if ( strval( $section ) == '' ) { //NOTE: keep condition in sync with condition in replaceSectionContent!
1425                         // Whole-page edit; let the whole text through
1426                         return $text;
1427                 }
1428
1429                 if ( !$this->supportsSections() ) {
1430                         throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1431                 }
1432
1433                 $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() ); # could even make section title, but that's not required.
1434
1435                 $newContent = $this->replaceSectionContent( $section, $sectionContent, $sectionTitle, $edittime );
1436
1437                 return ContentHandler::getContentText( $newContent );
1438         }
1439
1440         /**
1441          * Returns true iff this page's content model supports sections.
1442          *
1443          * @return boolean whether sections are supported.
1444          *
1445          * @todo: the skin should check this and not offer section functionality if sections are not supported.
1446          * @todo: the EditPage should check this and not offer section functionality if sections are not supported.
1447          */
1448         public function supportsSections() {
1449                 return $this->getContentHandler()->supportsSections();
1450         }
1451
1452         /**
1453          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1454          * @param $content Content: new content of the section
1455          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1456          * @param $edittime String: revision timestamp or null to use the current revision
1457          *
1458          * @return Content new complete article content, or null if error
1459          *
1460          * @since 1.WD
1461          */
1462         public function replaceSectionContent( $section, Content $sectionContent, $sectionTitle = '', $edittime = null ) {
1463                 wfProfileIn( __METHOD__ );
1464
1465                 if ( strval( $section ) == '' ) {
1466                         // Whole-page edit; let the whole text through
1467                         $newContent = $sectionContent;
1468                 } else {
1469                         if ( !$this->supportsSections() ) {
1470                                 throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1471                         }
1472
1473                         // Bug 30711: always use current version when adding a new section
1474                         if ( is_null( $edittime ) || $section == 'new' ) {
1475                                 $oldContent = $this->getContent();
1476                                 if ( ! $oldContent ) {
1477                                         wfDebug( __METHOD__ . ": no page text\n" );
1478                                         wfProfileOut( __METHOD__ );
1479                                         return null;
1480                                 }
1481                         } else {
1482                                 $dbw = wfGetDB( DB_MASTER );
1483                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1484
1485                                 if ( !$rev ) {
1486                                         wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1487                                                 $this->getId() . "; section: $section; edittime: $edittime)\n" );
1488                                         wfProfileOut( __METHOD__ );
1489                                         return null;
1490                                 }
1491
1492                                 $oldContent = $rev->getContent();
1493                         }
1494
1495                         $newContent = $oldContent->replaceSection( $section, $sectionContent, $sectionTitle );
1496                 }
1497
1498                 wfProfileOut( __METHOD__ );
1499                 return $newContent;
1500         }
1501
1502         /**
1503          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1504          * @param $flags Int
1505          * @return Int updated $flags
1506          */
1507         function checkFlags( $flags ) {
1508                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1509                         if ( $this->mTitle->getArticleID() ) {
1510                                 $flags |= EDIT_UPDATE;
1511                         } else {
1512                                 $flags |= EDIT_NEW;
1513                         }
1514                 }
1515
1516                 return $flags;
1517         }
1518
1519         /**
1520          * Change an existing article or create a new article. Updates RC and all necessary caches,
1521          * optionally via the deferred update array.
1522          *
1523          * @param $text String: new text
1524          * @param $summary String: edit summary
1525          * @param $flags Integer bitfield:
1526          *      EDIT_NEW
1527          *          Article is known or assumed to be non-existent, create a new one
1528          *      EDIT_UPDATE
1529          *          Article is known or assumed to be pre-existing, update it
1530          *      EDIT_MINOR
1531          *          Mark this edit minor, if the user is allowed to do so
1532          *      EDIT_SUPPRESS_RC
1533          *          Do not log the change in recentchanges
1534          *      EDIT_FORCE_BOT
1535          *          Mark the edit a "bot" edit regardless of user rights
1536          *      EDIT_DEFER_UPDATES
1537          *          Defer some of the updates until the end of index.php
1538          *      EDIT_AUTOSUMMARY
1539          *          Fill in blank summaries with generated text where possible
1540          *
1541          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1542          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1543          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1544          * edit-already-exists error will be returned. These two conditions are also possible with
1545          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1546          *
1547          * @param $baseRevId int the revision ID this edit was based off, if any
1548          * @param $user User the user doing the edit
1549          *
1550          * @return Status object. Possible errors:
1551          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1552          *     edit-gone-missing:       In update mode, but the article didn't exist
1553          *     edit-conflict:           In update mode, the article changed unexpectedly
1554          *     edit-no-change:          Warning that the text was the same as before
1555          *     edit-already-exists:     In creation mode, but the article already exists
1556          *
1557          *  Extensions may define additional errors.
1558          *
1559          *  $return->value will contain an associative array with members as follows:
1560          *     new:                     Boolean indicating if the function attempted to create a new article
1561          *     revision:                The revision object for the inserted revision, or null
1562          *
1563          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1564          *
1565          * @deprecated since 1.WD: use doEditContent() instead.
1566          */
1567         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) { #@todo: use doEditContent() instead
1568                 wfDeprecated( __METHOD__, '1.WD' );
1569
1570                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1571
1572                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1573         }
1574
1575         /**
1576          * Change an existing article or create a new article. Updates RC and all necessary caches,
1577          * optionally via the deferred update array.
1578          *
1579          * @param $content Content: new content
1580          * @param $summary String: edit summary
1581          * @param $flags Integer bitfield:
1582          *      EDIT_NEW
1583          *          Article is known or assumed to be non-existent, create a new one
1584          *      EDIT_UPDATE
1585          *          Article is known or assumed to be pre-existing, update it
1586          *      EDIT_MINOR
1587          *          Mark this edit minor, if the user is allowed to do so
1588          *      EDIT_SUPPRESS_RC
1589          *          Do not log the change in recentchanges
1590          *      EDIT_FORCE_BOT
1591          *          Mark the edit a "bot" edit regardless of user rights
1592          *      EDIT_DEFER_UPDATES
1593          *          Defer some of the updates until the end of index.php
1594          *      EDIT_AUTOSUMMARY
1595          *          Fill in blank summaries with generated text where possible
1596          *
1597          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1598          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1599          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1600          * edit-already-exists error will be returned. These two conditions are also possible with
1601          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1602          *
1603          * @param $baseRevId the revision ID this edit was based off, if any
1604          * @param $user User the user doing the edit
1605          * @param $serialisation_format String: format for storing the content in the database
1606          *
1607          * @return Status object. Possible errors:
1608          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1609          *     edit-gone-missing:       In update mode, but the article didn't exist
1610          *     edit-conflict:           In update mode, the article changed unexpectedly
1611          *     edit-no-change:          Warning that the text was the same as before
1612          *     edit-already-exists:     In creation mode, but the article already exists
1613          *
1614          *  Extensions may define additional errors.
1615          *
1616          *  $return->value will contain an associative array with members as follows:
1617          *     new:                     Boolean indicating if the function attempted to create a new article
1618          *     revision:                The revision object for the inserted revision, or null
1619          *
1620          * @since 1.WD
1621          */
1622         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1623                                                                    User $user = null, $serialisation_format = null ) {
1624                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1625
1626                 # Low-level sanity check
1627                 if ( $this->mTitle->getText() === '' ) {
1628                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1629                 }
1630
1631                 wfProfileIn( __METHOD__ );
1632
1633                 $user = is_null( $user ) ? $wgUser : $user;
1634                 $status = Status::newGood( array() );
1635
1636                 // Load the data from the master database if needed.
1637                 // The caller may already loaded it from the master or even loaded it using
1638                 // SELECT FOR UPDATE, so do not override that using clear().
1639                 $this->loadPageData( 'fromdbmaster' );
1640
1641                 $flags = $this->checkFlags( $flags );
1642
1643                 # call legacy hook
1644                 $hook_ok = wfRunHooks( 'ArticleContentSave', array( &$this, &$user, &$content, &$summary,
1645                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) );
1646
1647                 if ( $hook_ok && Hooks::isRegistered( 'ArticleSave' ) ) { # avoid serialization overhead if the hook isn't present
1648                         $content_text = $content->serialize();
1649                         $txt = $content_text; # clone
1650
1651                         $hook_ok = wfRunHooks( 'ArticleSave', array( &$this, &$user, &$txt, &$summary,
1652                                 $flags & EDIT_MINOR, null, null, &$flags, &$status ) ); #TODO: survey extensions using this hook
1653
1654                         if ( $txt !== $content_text ) {
1655                                 # if the text changed, unserialize the new version to create an updated Content object.
1656                                 $content = $content->getContentHandler()->unserializeContent( $txt );
1657                         }
1658                 }
1659
1660                 if ( !$hook_ok ) {
1661                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1662
1663                         if ( $status->isOK() ) {
1664                                 $status->fatal( 'edit-hook-aborted' );
1665                         }
1666
1667                         wfProfileOut( __METHOD__ );
1668                         return $status;
1669                 }
1670
1671                 # Silently ignore EDIT_MINOR if not allowed
1672                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1673                 $bot = $flags & EDIT_FORCE_BOT;
1674
1675                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1676
1677                 $oldsize = $old_content ? $old_content->getSize() : 0;
1678                 $oldid = $this->getLatest();
1679                 $oldIsRedirect = $this->isRedirect();
1680                 $oldcountable = $this->isCountable();
1681
1682                 $handler = $content->getContentHandler();
1683
1684                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1685                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1686                         if ( !$old_content ) $old_content = null;
1687                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1688                 }
1689
1690                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialisation_format );
1691                 $serialized = $editInfo->pst;
1692                 $content = $editInfo->pstContent;
1693                 $newsize =  $content->getSize();
1694
1695                 $dbw = wfGetDB( DB_MASTER );
1696                 $now = wfTimestampNow();
1697                 $this->mTimestamp = $now;
1698
1699                 if ( $flags & EDIT_UPDATE ) {
1700                         # Update article, but only if changed.
1701                         $status->value['new'] = false;
1702
1703                         if ( !$oldid ) {
1704                                 # Article gone missing
1705                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1706                                 $status->fatal( 'edit-gone-missing' );
1707
1708                                 wfProfileOut( __METHOD__ );
1709                                 return $status;
1710                         } elseif ( !$old_content ) {
1711                                 # Sanity check for bug 37225
1712                                 wfProfileOut( __METHOD__ );
1713                                 throw new MWException( "Could not find text for current revision {$oldid}." );
1714                         }
1715
1716                         $revision = new Revision( array(
1717                                 'page'       => $this->getId(),
1718                                 'comment'    => $summary,
1719                                 'minor_edit' => $isminor,
1720                                 'text'       => $serialized,
1721                                 'len'        => $newsize,
1722                                 'parent_id'  => $oldid,
1723                                 'user'       => $user->getId(),
1724                                 'user_text'  => $user->getName(),
1725                                 'timestamp'  => $now,
1726                                 'content_model' => $content->getModel(),
1727                                 'content_format' => $serialisation_format,
1728                         ) ); #XXX: pass content object?!
1729
1730                         # Bug 37225: use accessor to get the text as Revision may trim it.
1731                         # After trimming, the text may be a duplicate of the current text.
1732                         $content = $revision->getContent(); // sanity; EditPage should trim already
1733
1734                         $changed = !$content->equals( $old_content );
1735
1736                         if ( $changed ) {
1737                                 if ( !$content->isValid() ) {
1738                                         throw new MWException( "New content failed validity check!" );
1739                                 }
1740
1741                                 $dbw->begin( __METHOD__ );
1742
1743                                 $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1744                                 $status->merge( $prepStatus );
1745
1746                                 if ( !$status->isOK() ) {
1747                                         $dbw->rollback();
1748
1749                                         wfProfileOut( __METHOD__ );
1750                                         return $status;
1751                                 }
1752
1753                                 $revisionId = $revision->insertOn( $dbw );
1754
1755                                 # Update page
1756                                 #
1757                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1758                                 # during the course of this function. This makes sure that EditPage can detect
1759                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1760                                 # before this function is called. A previous function used a separate query, this
1761                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1762                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1763
1764                                 if ( !$ok ) {
1765                                         /* Belated edit conflict! Run away!! */
1766                                         $status->fatal( 'edit-conflict' );
1767
1768                                         $revisionId = 0;
1769                                         $dbw->rollback( __METHOD__ );
1770                                 } else {
1771                                         global $wgUseRCPatrol;
1772                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1773                                         # Update recentchanges
1774                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1775                                                 # Mark as patrolled if the user can do so
1776                                                 $patrolled = $wgUseRCPatrol && !count(
1777                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1778                                                 # Add RC row to the DB
1779                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1780                                                         $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1781                                                         $revisionId, $patrolled
1782                                                 );
1783
1784                                                 # Log auto-patrolled edits
1785                                                 if ( $patrolled ) {
1786                                                         PatrolLog::record( $rc, true, $user );
1787                                                 }
1788                                         }
1789                                         $user->incEditCount();
1790                                         $dbw->commit( __METHOD__ );
1791                                 }
1792                         } else {
1793                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1794                                 // related variables correctly
1795                                 $revision->setId( $this->getLatest() );
1796                         }
1797
1798                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1799                         if ( !$status->isOK() ) {
1800                                 wfProfileOut( __METHOD__ );
1801                                 return $status;
1802                         }
1803
1804                         # Update links tables, site stats, etc.
1805                         $this->doEditUpdates(
1806                                 $revision,
1807                                 $user,
1808                                 array(
1809                                         'changed' => $changed,
1810                                         'oldcountable' => $oldcountable
1811                                 )
1812                         );
1813
1814                         if ( !$changed ) {
1815                                 $status->warning( 'edit-no-change' );
1816                                 $revision = null;
1817                                 // Update page_touched, this is usually implicit in the page update
1818                                 // Other cache updates are done in onArticleEdit()
1819                                 $this->mTitle->invalidateCache();
1820                         }
1821                 } else {
1822                         # Create new article
1823                         $status->value['new'] = true;
1824
1825                         $dbw->begin( __METHOD__ );
1826
1827                         $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1828                         $status->merge( $prepStatus );
1829
1830                         if ( !$status->isOK() ) {
1831                                 $dbw->rollback();
1832
1833                                 wfProfileOut( __METHOD__ );
1834                                 return $status;
1835                         }
1836
1837                         $status->merge( $prepStatus );
1838
1839                         # Add the page record; stake our claim on this title!
1840                         # This will return false if the article already exists
1841                         $newid = $this->insertOn( $dbw );
1842
1843                         if ( $newid === false ) {
1844                                 $dbw->rollback( __METHOD__ );
1845                                 $status->fatal( 'edit-already-exists' );
1846
1847                                 wfProfileOut( __METHOD__ );
1848                                 return $status;
1849                         }
1850
1851                         # Save the revision text...
1852                         $revision = new Revision( array(
1853                                 'page'       => $newid,
1854                                 'comment'    => $summary,
1855                                 'minor_edit' => $isminor,
1856                                 'text'       => $serialized,
1857                                 'len'        => $newsize,
1858                                 'user'       => $user->getId(),
1859                                 'user_text'  => $user->getName(),
1860                                 'timestamp'  => $now,
1861                                 'content_model' => $content->getModel(),
1862                                 'content_format' => $serialisation_format,
1863                         ) );
1864                         $revisionId = $revision->insertOn( $dbw );
1865
1866                         # Bug 37225: use accessor to get the text as Revision may trim it
1867                         $content = $revision->getContent(); // sanity; get normalized version
1868
1869                         # Update the page record with revision data
1870                         $this->updateRevisionOn( $dbw, $revision, 0 );
1871
1872                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1873
1874                         # Update recentchanges
1875                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1876                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1877
1878                                 # Mark as patrolled if the user can do so
1879                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1880                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1881                                 # Add RC row to the DB
1882                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1883                                         '', $content->getSize(), $revisionId, $patrolled );
1884
1885                                 # Log auto-patrolled edits
1886                                 if ( $patrolled ) {
1887                                         PatrolLog::record( $rc, true, $user );
1888                                 }
1889                         }
1890                         $user->incEditCount();
1891                         $dbw->commit( __METHOD__ );
1892
1893                         # Update links, etc.
1894                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1895
1896                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $serialized, $summary,
1897                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1898
1899                         wfRunHooks( 'ArticleContentInsertComplete', array( &$this, &$user, $content, $summary,
1900                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1901                 }
1902
1903                 # Do updates right now unless deferral was requested
1904                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1905                         DeferredUpdates::doUpdates();
1906                 }
1907
1908                 // Return the new revision (or null) to the caller
1909                 $status->value['revision'] = $revision;
1910
1911                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $serialized, $summary,
1912                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1913
1914                 wfRunHooks( 'ArticleContentSaveComplete', array( &$this, &$user, $content, $summary,
1915                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1916
1917                 # Promote user to any groups they meet the criteria for
1918                 $user->addAutopromoteOnceGroups( 'onEdit' );
1919
1920                 wfProfileOut( __METHOD__ );
1921                 return $status;
1922         }
1923
1924         /**
1925          * Get parser options suitable for rendering the primary article wikitext
1926          * @param User|string $user User object or 'canonical'
1927          * @return ParserOptions
1928          */
1929         public function makeParserOptions( $user ) {
1930                 global $wgContLang;
1931                 if ( $user instanceof User ) { // settings per user (even anons)
1932                         $options = ParserOptions::newFromUser( $user );
1933                 } else { // canonical settings
1934                         $options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
1935                 }
1936                 $options->enableLimitReport(); // show inclusion/loop reports
1937                 $options->setTidy( true ); // fix bad HTML
1938                 return $options;
1939         }
1940
1941         /**
1942          * Prepare text which is about to be saved.
1943          * Returns a stdclass with source, pst and output members
1944          *
1945          * @deprecated in 1.WD: use prepareContentForEdit instead.
1946          */
1947         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1948                 wfDeprecated( __METHOD__, '1.WD' );
1949                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1950                 return $this->prepareContentForEdit( $content, $revid , $user );
1951         }
1952
1953         /**
1954          * Prepare content which is about to be saved.
1955          * Returns a stdclass with source, pst and output members
1956          *
1957          * @param \Content $content
1958          * @param null $revid
1959          * @param null|\User $user
1960          * @param null $serialization_format
1961          *
1962          * @return bool|object
1963          *
1964          * @since 1.WD
1965          */
1966         public function prepareContentForEdit( Content $content, $revid = null, User $user = null, $serialization_format = null ) {
1967                 global $wgParser, $wgContLang, $wgUser;
1968                 $user = is_null( $user ) ? $wgUser : $user;
1969                 // @TODO fixme: check $user->getId() here???
1970
1971                 if ( $this->mPreparedEdit
1972                         && $this->mPreparedEdit->newContent
1973                         && $this->mPreparedEdit->newContent->equals( $content )
1974                         && $this->mPreparedEdit->revid == $revid
1975                         && $this->mPreparedEdit->format == $serialization_format
1976                         #XXX: also check $user here?
1977                 ) {
1978                         // Already prepared
1979                         return $this->mPreparedEdit;
1980                 }
1981
1982                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
1983                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1984
1985                 $edit = (object)array();
1986                 $edit->revid = $revid;
1987
1988                 $edit->pstContent = $content->preSaveTransform( $this->mTitle, $user, $popts );
1989                 $edit->pst = $edit->pstContent->serialize( $serialization_format ); #XXX: do we need this??
1990                 $edit->format = $serialization_format;
1991
1992                 $edit->popts = $this->makeParserOptions( 'canonical' );
1993
1994                 $edit->output = $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts );
1995
1996                 $edit->newContent = $content;
1997                 $edit->oldContent = $this->getContent( Revision::RAW );
1998
1999                 #NOTE: B/C for hooks! don't use these fields!
2000                 $edit->newText = ContentHandler::getContentText( $edit->newContent );
2001                 $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : '';
2002
2003                 $this->mPreparedEdit = $edit;
2004
2005                 return $edit;
2006         }
2007
2008         /**
2009          * Do standard deferred updates after page edit.
2010          * Update links tables, site stats, search index and message cache.
2011          * Purges pages that include this page if the text was changed here.
2012          * Every 100th edit, prune the recent changes table.
2013          *
2014          * @param $revision Revision object
2015          * @param $user User object that did the revision
2016          * @param $options Array of options, following indexes are used:
2017          * - changed: boolean, whether the revision changed the content (default true)
2018          * - created: boolean, whether the revision created the page (default false)
2019          * - oldcountable: boolean or null (default null):
2020          *   - boolean: whether the page was counted as an article before that
2021          *     revision, only used in changed is true and created is false
2022          *   - null: don't change the article count
2023          */
2024         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2025                 global $wgEnableParserCache;
2026
2027                 wfProfileIn( __METHOD__ );
2028
2029                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
2030                 $content = $revision->getContent();
2031
2032                 # Parse the text
2033                 # Be careful not to double-PST: $text is usually already PST-ed once
2034                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2035                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2036                         $editInfo = $this->prepareContentForEdit( $content, $revision->getId(), $user );
2037                 } else {
2038                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2039                         $editInfo = $this->mPreparedEdit;
2040                 }
2041
2042                 # Save it to the parser cache
2043                 if ( $wgEnableParserCache ) {
2044                         $parserCache = ParserCache::singleton();
2045                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
2046                 }
2047
2048                 # Update the links tables and other secondary data
2049                 $updates = $content->getSecondaryDataUpdates( $this->getTitle(), null, true, $editInfo->output );
2050                 DataUpdate::runUpdates( $updates );
2051
2052                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2053
2054                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2055                         if ( 0 == mt_rand( 0, 99 ) ) {
2056                                 // Flush old entries from the `recentchanges` table; we do this on
2057                                 // random requests so as to avoid an increase in writes for no good reason
2058                                 global $wgRCMaxAge;
2059
2060                                 $dbw = wfGetDB( DB_MASTER );
2061                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2062                                 $dbw->delete(
2063                                         'recentchanges',
2064                                         array( "rc_timestamp < '$cutoff'" ),
2065                                         __METHOD__
2066                                 );
2067                         }
2068                 }
2069
2070                 if ( !$this->mTitle->exists() ) {
2071                         wfProfileOut( __METHOD__ );
2072                         return;
2073                 }
2074
2075                 $id = $this->getId();
2076                 $title = $this->mTitle->getPrefixedDBkey();
2077                 $shortTitle = $this->mTitle->getDBkey();
2078
2079                 if ( !$options['changed'] ) {
2080                         $good = 0;
2081                         $total = 0;
2082                 } elseif ( $options['created'] ) {
2083                         $good = (int)$this->isCountable( $editInfo );
2084                         $total = 1;
2085                 } elseif ( $options['oldcountable'] !== null ) {
2086                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2087                         $total = 0;
2088                 } else {
2089                         $good = 0;
2090                         $total = 0;
2091                 }
2092
2093                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
2094                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content->getTextForSearchIndex() ) ); #TODO: let the search engine decide what to do with the content object
2095
2096                 # If this is another user's talk page, update newtalk.
2097                 # Don't do this if $options['changed'] = false (null-edits) nor if
2098                 # it's a minor edit and the user doesn't want notifications for those.
2099                 if ( $options['changed']
2100                         && $this->mTitle->getNamespace() == NS_USER_TALK
2101                         && $shortTitle != $user->getTitleKey()
2102                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2103                 ) {
2104                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2105                                 $other = User::newFromName( $shortTitle, false );
2106                                 if ( !$other ) {
2107                                         wfDebug( __METHOD__ . ": invalid username\n" );
2108                                 } elseif ( User::isIP( $shortTitle ) ) {
2109                                         // An anonymous user
2110                                         $other->setNewtalk( true );
2111                                 } elseif ( $other->isLoggedIn() ) {
2112                                         $other->setNewtalk( true );
2113                                 } else {
2114                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2115                                 }
2116                         }
2117                 }
2118
2119                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2120                         $msgtext = $content->getWikitextForTransclusion(); #XXX: could skip pseudo-messages like js/css here, based on content model.
2121                         if ( $msgtext === false || $msgtext === null ) $msgtext = '';
2122
2123                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2124                 }
2125
2126                 if( $options['created'] ) {
2127                         self::onArticleCreate( $this->mTitle );
2128                 } else {
2129                         self::onArticleEdit( $this->mTitle );
2130                 }
2131
2132                 wfProfileOut( __METHOD__ );
2133         }
2134
2135         /**
2136          * Edit an article without doing all that other stuff
2137          * The article must already exist; link tables etc
2138          * are not updated, caches are not flushed.
2139          *
2140          * @param $text String: text submitted
2141          * @param $user User The relevant user
2142          * @param $comment String: comment submitted
2143          * @param $minor Boolean: whereas it's a minor modification
2144          *
2145          * @deprecated since 1.WD, use doEditContent() instead.
2146          */
2147         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2148                 wfDeprecated( __METHOD__, "1.WD" );
2149
2150                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2151                 return $this->doQuickEditContent( $content, $user, $comment , $minor );
2152         }
2153
2154         /**
2155          * Edit an article without doing all that other stuff
2156          * The article must already exist; link tables etc
2157          * are not updated, caches are not flushed.
2158          *
2159          * @param $content Content: content submitted
2160          * @param $user User The relevant user
2161          * @param $comment String: comment submitted
2162          * @param $serialisation_format String: format for storing the content in the database
2163          * @param $minor Boolean: whereas it's a minor modification
2164          */
2165         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = 0, $serialisation_format = null ) {
2166                 wfProfileIn( __METHOD__ );
2167
2168                 $serialized = $content->serialize( $serialisation_format );
2169
2170                 $dbw = wfGetDB( DB_MASTER );
2171                 $revision = new Revision( array(
2172                         'page'       => $this->getId(),
2173                         'text'       => $serialized,
2174                         'length'     => $content->getSize(),
2175                         'comment'    => $comment,
2176                         'minor_edit' => $minor ? 1 : 0,
2177                 ) ); #XXX: set the content object?
2178                 $revision->insertOn( $dbw );
2179                 $this->updateRevisionOn( $dbw, $revision );
2180
2181                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2182
2183                 wfProfileOut( __METHOD__ );
2184         }
2185
2186         /**
2187          * Update the article's restriction field, and leave a log entry.
2188          * This works for protection both existing and non-existing pages.
2189          *
2190          * @param $limit Array: set of restriction keys
2191          * @param $reason String
2192          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2193          * @param $expiry Array: per restriction type expiration
2194          * @param $user User The user updating the restrictions
2195          * @return Status
2196          */
2197         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
2198                 global $wgContLang;
2199
2200                 if ( wfReadOnly() ) {
2201                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2202                 }
2203
2204                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2205
2206                 $id = $this->mTitle->getArticleID();
2207
2208                 if ( !$cascade ) {
2209                         $cascade = false;
2210                 }
2211
2212                 // Take this opportunity to purge out expired restrictions
2213                 Title::purgeExpiredRestrictions();
2214
2215                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2216                 # we expect a single selection, but the schema allows otherwise.
2217                 $isProtected = false;
2218                 $protect = false;
2219                 $changed = false;
2220
2221                 $dbw = wfGetDB( DB_MASTER );
2222
2223                 foreach ( $restrictionTypes as $action ) {
2224                         if ( !isset( $expiry[$action] ) ) {
2225                                 $expiry[$action] = $dbw->getInfinity();
2226                         }
2227                         if ( !isset( $limit[$action] ) ) {
2228                                 $limit[$action] = '';
2229                         } elseif ( $limit[$action] != '' ) {
2230                                 $protect = true;
2231                         }
2232
2233                         # Get current restrictions on $action
2234                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2235                         if ( $current != '' ) {
2236                                 $isProtected = true;
2237                         }
2238
2239                         if ( $limit[$action] != $current ) {
2240                                 $changed = true;
2241                         } elseif ( $limit[$action] != '' ) {
2242                                 # Only check expiry change if the action is actually being
2243                                 # protected, since expiry does nothing on an not-protected
2244                                 # action.
2245                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2246                                         $changed = true;
2247                                 }
2248                         }
2249                 }
2250
2251                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2252                         $changed = true;
2253                 }
2254
2255                 # If nothing's changed, do nothing
2256                 if ( !$changed ) {
2257                         return Status::newGood();
2258                 }
2259
2260                 if ( !$protect ) { # No protection at all means unprotection
2261                         $revCommentMsg = 'unprotectedarticle';
2262                         $logAction = 'unprotect';
2263                 } elseif ( $isProtected ) {
2264                         $revCommentMsg = 'modifiedarticleprotection';
2265                         $logAction = 'modify';
2266                 } else {
2267                         $revCommentMsg = 'protectedarticle';
2268                         $logAction = 'protect';
2269                 }
2270
2271                 $encodedExpiry = array();
2272                 $protectDescription = '';
2273                 foreach ( $limit as $action => $restrictions ) {
2274                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
2275                         if ( $restrictions != '' ) {
2276                                 $protectDescription .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
2277                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2278                                         $protectDescription .= wfMsgForContent( 'protect-expiring',
2279                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2280                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2281                                                 $wgContLang->time( $expiry[$action], false, false ) );
2282                                 } else {
2283                                         $protectDescription .= wfMsgForContent( 'protect-expiry-indefinite' );
2284                                 }
2285
2286                                 $protectDescription .= ') ';
2287                         }
2288                 }
2289                 $protectDescription = trim( $protectDescription );
2290
2291                 if ( $id ) { # Protection of existing page
2292                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2293                                 return Status::newGood();
2294                         }
2295
2296                         # Only restrictions with the 'protect' right can cascade...
2297                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2298                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2299
2300                         # The schema allows multiple restrictions
2301                         if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2302                                 $cascade = false;
2303                         }
2304
2305                         # Update restrictions table
2306                         foreach ( $limit as $action => $restrictions ) {
2307                                 if ( $restrictions != '' ) {
2308                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2309                                                 array( 'pr_page' => $id,
2310                                                         'pr_type' => $action,
2311                                                         'pr_level' => $restrictions,
2312                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2313                                                         'pr_expiry' => $encodedExpiry[$action]
2314                                                 ),
2315                                                 __METHOD__
2316                                         );
2317                                 } else {
2318                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2319                                                 'pr_type' => $action ), __METHOD__ );
2320                                 }
2321                         }
2322
2323                         # Prepare a null revision to be added to the history
2324                         $editComment = $wgContLang->ucfirst( wfMsgForContent( $revCommentMsg, $this->mTitle->getPrefixedText() ) );
2325                         if ( $reason ) {
2326                                 $editComment .= ": $reason";
2327                         }
2328                         if ( $protectDescription ) {
2329                                 $editComment .= " ($protectDescription)";
2330                         }
2331                         if ( $cascade ) {
2332                                 $editComment .= ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2333                         }
2334
2335                         # Insert a null revision
2336                         $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2337                         $nullRevId = $nullRevision->insertOn( $dbw );
2338
2339                         $latest = $this->getLatest();
2340                         # Update page record
2341                         $dbw->update( 'page',
2342                                 array( /* SET */
2343                                         'page_touched' => $dbw->timestamp(),
2344                                         'page_restrictions' => '',
2345                                         'page_latest' => $nullRevId
2346                                 ), array( /* WHERE */
2347                                         'page_id' => $id
2348                                 ), __METHOD__
2349                         );
2350
2351                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2352                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2353                 } else { # Protection of non-existing page (also known as "title protection")
2354                         # Cascade protection is meaningless in this case
2355                         $cascade = false;
2356
2357                         if ( $limit['create'] != '' ) {
2358                                 $dbw->replace( 'protected_titles',
2359                                         array( array( 'pt_namespace', 'pt_title' ) ),
2360                                         array(
2361                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2362                                                 'pt_title' => $this->mTitle->getDBkey(),
2363                                                 'pt_create_perm' => $limit['create'],
2364                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
2365                                                 'pt_expiry' => $encodedExpiry['create'],
2366                                                 'pt_user' => $user->getId(),
2367                                                 'pt_reason' => $reason,
2368                                         ), __METHOD__
2369                                 );
2370                         } else {
2371                                 $dbw->delete( 'protected_titles',
2372                                         array(
2373                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2374                                                 'pt_title' => $this->mTitle->getDBkey()
2375                                         ), __METHOD__
2376                                 );
2377                         }
2378                 }
2379
2380                 $this->mTitle->flushRestrictions();
2381
2382                 if ( $logAction == 'unprotect' ) {
2383                         $logParams = array();
2384                 } else {
2385                         $logParams = array( $protectDescription, $cascade ? 'cascade' : '' );
2386                 }
2387
2388                 # Update the protection log
2389                 $log = new LogPage( 'protect' );
2390                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $logParams, $user );
2391
2392                 return Status::newGood();
2393         }
2394
2395         /**
2396          * Take an array of page restrictions and flatten it to a string
2397          * suitable for insertion into the page_restrictions field.
2398          * @param $limit Array
2399          * @return String
2400          */
2401         protected static function flattenRestrictions( $limit ) {
2402                 if ( !is_array( $limit ) ) {
2403                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2404                 }
2405
2406                 $bits = array();
2407                 ksort( $limit );
2408
2409                 foreach ( $limit as $action => $restrictions ) {
2410                         if ( $restrictions != '' ) {
2411                                 $bits[] = "$action=$restrictions";
2412                         }
2413                 }
2414
2415                 return implode( ':', $bits );
2416         }
2417
2418         /**
2419          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2420          * backwards compatibility, if you care about error reporting you should use
2421          * doDeleteArticleReal() instead.
2422          *
2423          * Deletes the article with database consistency, writes logs, purges caches
2424          *
2425          * @param $reason string delete reason for deletion log
2426          * @param $suppress int bitfield
2427          *      Revision::DELETED_TEXT
2428          *      Revision::DELETED_COMMENT
2429          *      Revision::DELETED_USER
2430          *      Revision::DELETED_RESTRICTED
2431          * @param $id int article ID
2432          * @param $commit boolean defaults to true, triggers transaction end
2433          * @param &$error Array of errors to append to
2434          * @param $user User The deleting user
2435          * @return boolean true if successful
2436          */
2437         public function doDeleteArticle(
2438                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2439         ) {
2440                 $status = $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user );
2441                 return $status->isGood();
2442         }
2443
2444         /**
2445          * Back-end article deletion
2446          * Deletes the article with database consistency, writes logs, purges caches
2447          *
2448          * @param $reason string delete reason for deletion log
2449          * @param $suppress int bitfield
2450          *      Revision::DELETED_TEXT
2451          *      Revision::DELETED_COMMENT
2452          *      Revision::DELETED_USER
2453          *      Revision::DELETED_RESTRICTED
2454          * @param $id int article ID
2455          * @param $commit boolean defaults to true, triggers transaction end
2456          * @param &$error Array of errors to append to
2457          * @param $user User The deleting user
2458          * @return Status: Status object; if successful, $status->value is the log_id of the
2459          *                 deletion log entry. If the page couldn't be deleted because it wasn't
2460          *                 found, $status is a non-fatal 'cannotdelete' error
2461          */
2462         public function doDeleteArticleReal(
2463                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2464         ) {
2465                 global $wgUser, $wgContentHandlerUseDB;
2466
2467                 wfDebug( __METHOD__ . "\n" );
2468
2469                 $status = Status::newGood();
2470
2471                 if ( $this->mTitle->getDBkey() === '' ) {
2472                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2473                         return $status;
2474                 }
2475
2476                 $user = is_null( $user ) ? $wgUser : $user;
2477                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error, &$status ) ) ) {
2478                         if ( $status->isOK() ) {
2479                                 // Hook aborted but didn't set a fatal status
2480                                 $status->fatal( 'delete-hook-aborted' );
2481                         }
2482                         return $status;
2483                 }
2484
2485                 if ( $id == 0 ) {
2486                         $this->loadPageData( 'forupdate' );
2487                         $id = $this->getID();
2488                         if ( $id == 0 ) {
2489                                 $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2490                                 return $status;
2491                         }
2492                 }
2493
2494                 // Bitfields to further suppress the content
2495                 if ( $suppress ) {
2496                         $bitfield = 0;
2497                         // This should be 15...
2498                         $bitfield |= Revision::DELETED_TEXT;
2499                         $bitfield |= Revision::DELETED_COMMENT;
2500                         $bitfield |= Revision::DELETED_USER;
2501                         $bitfield |= Revision::DELETED_RESTRICTED;
2502                 } else {
2503                         $bitfield = 'rev_deleted';
2504                 }
2505
2506                 // we need to remember the old content so we can use it to generate all deletion updates.
2507                 $content = $this->getContent( Revision::RAW );
2508
2509                 $dbw = wfGetDB( DB_MASTER );
2510                 $dbw->begin( __METHOD__ );
2511                 // For now, shunt the revision data into the archive table.
2512                 // Text is *not* removed from the text table; bulk storage
2513                 // is left intact to avoid breaking block-compression or
2514                 // immutable storage schemes.
2515                 //
2516                 // For backwards compatibility, note that some older archive
2517                 // table entries will have ar_text and ar_flags fields still.
2518                 //
2519                 // In the future, we may keep revisions and mark them with
2520                 // the rev_deleted field, which is reserved for this purpose.
2521
2522                 $row = array(
2523                         'ar_namespace'  => 'page_namespace',
2524                         'ar_title'      => 'page_title',
2525                         'ar_comment'    => 'rev_comment',
2526                         'ar_user'       => 'rev_user',
2527                         'ar_user_text'  => 'rev_user_text',
2528                         'ar_timestamp'  => 'rev_timestamp',
2529                         'ar_minor_edit' => 'rev_minor_edit',
2530                         'ar_rev_id'     => 'rev_id',
2531                         'ar_parent_id'  => 'rev_parent_id',
2532                         'ar_text_id'    => 'rev_text_id',
2533                         'ar_text'       => '\'\'', // Be explicit to appease
2534                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2535                         'ar_len'        => 'rev_len',
2536                         'ar_page_id'    => 'page_id',
2537                         'ar_deleted'    => $bitfield,
2538                         'ar_sha1'       => 'rev_sha1',
2539                 );
2540
2541                 if ( $wgContentHandlerUseDB ) {
2542                         $row[ 'ar_content_model' ] = 'rev_content_model';
2543                         $row[ 'ar_content_format' ] = 'rev_content_format';
2544                 }
2545
2546                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2547                         $row,
2548                         array(
2549                                 'page_id' => $id,
2550                                 'page_id = rev_page'
2551                         ), __METHOD__
2552                 );
2553
2554                 # Now that it's safely backed up, delete it
2555                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2556                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleID() uses slave, could be laggy
2557
2558                 if ( !$ok ) {
2559                         $dbw->rollback( __METHOD__ );
2560                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2561                         return $status;
2562                 }
2563
2564                 $this->doDeleteUpdates( $id, $content );
2565
2566                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2567                 $logtype = $suppress ? 'suppress' : 'delete';
2568
2569                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2570                 $logEntry->setPerformer( $user );
2571                 $logEntry->setTarget( $this->mTitle );
2572                 $logEntry->setComment( $reason );
2573                 $logid = $logEntry->insert();
2574                 $logEntry->publish( $logid );
2575
2576                 if ( $commit ) {
2577                         $dbw->commit( __METHOD__ );
2578                 }
2579
2580                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
2581                 $status->value = $logid;
2582                 return $status;
2583         }
2584
2585         /**
2586          * Do some database updates after deletion
2587          *
2588          * @param $id Int: page_id value of the page being deleted (B/C, currently unused)
2589          * @param $content Content: optional page content to be used when determining the required updates.
2590          *        This may be needed because $this->getContent() may already return null when the page proper was deleted.
2591          */
2592         public function doDeleteUpdates( $id, Content $content = null ) {
2593                 # update site status
2594                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2595
2596                 # remove secondary indexes, etc
2597                 $updates = $this->getDeletionUpdates( $content );
2598                 DataUpdate::runUpdates( $updates );
2599
2600                 # Clear caches
2601                 WikiPage::onArticleDelete( $this->mTitle );
2602
2603                 # Reset this object
2604                 $this->clear();
2605
2606                 # Clear the cached article id so the interface doesn't act like we exist
2607                 $this->mTitle->resetArticleID( 0 );
2608         }
2609
2610         /**
2611          * Roll back the most recent consecutive set of edits to a page
2612          * from the same user; fails if there are no eligible edits to
2613          * roll back to, e.g. user is the sole contributor. This function
2614          * performs permissions checks on $user, then calls commitRollback()
2615          * to do the dirty work
2616          *
2617          * @todo: seperate the business/permission stuff out from backend code
2618          *
2619          * @param $fromP String: Name of the user whose edits to rollback.
2620          * @param $summary String: Custom summary. Set to default summary if empty.
2621          * @param $token String: Rollback token.
2622          * @param $bot Boolean: If true, mark all reverted edits as bot.
2623          *
2624          * @param $resultDetails Array: contains result-specific array of additional values
2625          *    'alreadyrolled' : 'current' (rev)
2626          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2627          *
2628          * @param $user User The user performing the rollback
2629          * @return array of errors, each error formatted as
2630          *   array(messagekey, param1, param2, ...).
2631          * On success, the array is empty.  This array can also be passed to
2632          * OutputPage::showPermissionsErrorPage().
2633          */
2634         public function doRollback(
2635                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2636         ) {
2637                 $resultDetails = null;
2638
2639                 # Check permissions
2640                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2641                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2642                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2643
2644                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2645                         $errors[] = array( 'sessionfailure' );
2646                 }
2647
2648                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2649                         $errors[] = array( 'actionthrottledtext' );
2650                 }
2651
2652                 # If there were errors, bail out now
2653                 if ( !empty( $errors ) ) {
2654                         return $errors;
2655                 }
2656
2657                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2658         }
2659
2660         /**
2661          * Backend implementation of doRollback(), please refer there for parameter
2662          * and return value documentation
2663          *
2664          * NOTE: This function does NOT check ANY permissions, it just commits the
2665          * rollback to the DB. Therefore, you should only call this function direct-
2666          * ly if you want to use custom permissions checks. If you don't, use
2667          * doRollback() instead.
2668          * @param $fromP String: Name of the user whose edits to rollback.
2669          * @param $summary String: Custom summary. Set to default summary if empty.
2670          * @param $bot Boolean: If true, mark all reverted edits as bot.
2671          *
2672          * @param $resultDetails Array: contains result-specific array of additional values
2673          * @param $guser User The user performing the rollback
2674          * @return array
2675          */
2676         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2677                 global $wgUseRCPatrol, $wgContLang;
2678
2679                 $dbw = wfGetDB( DB_MASTER );
2680
2681                 if ( wfReadOnly() ) {
2682                         return array( array( 'readonlytext' ) );
2683                 }
2684
2685                 # Get the last editor
2686                 $current = $this->getRevision();
2687                 if ( is_null( $current ) ) {
2688                         # Something wrong... no page?
2689                         return array( array( 'notanarticle' ) );
2690                 }
2691
2692                 $from = str_replace( '_', ' ', $fromP );
2693                 # User name given should match up with the top revision.
2694                 # If the user was deleted then $from should be empty.
2695                 if ( $from != $current->getUserText() ) {
2696                         $resultDetails = array( 'current' => $current );
2697                         return array( array( 'alreadyrolled',
2698                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2699                                 htmlspecialchars( $fromP ),
2700                                 htmlspecialchars( $current->getUserText() )
2701                         ) );
2702                 }
2703
2704                 # Get the last edit not by this guy...
2705                 # Note: these may not be public values
2706                 $user = intval( $current->getRawUser() );
2707                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2708                 $s = $dbw->selectRow( 'revision',
2709                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2710                         array( 'rev_page' => $current->getPage(),
2711                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2712                         ), __METHOD__,
2713                         array( 'USE INDEX' => 'page_timestamp',
2714                                 'ORDER BY' => 'rev_timestamp DESC' )
2715                         );
2716                 if ( $s === false ) {
2717                         # No one else ever edited this page
2718                         return array( array( 'cantrollback' ) );
2719                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2720                         # Only admins can see this text
2721                         return array( array( 'notvisiblerev' ) );
2722                 }
2723
2724                 $set = array();
2725                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2726                         # Mark all reverted edits as bot
2727                         $set['rc_bot'] = 1;
2728                 }
2729
2730                 if ( $wgUseRCPatrol ) {
2731                         # Mark all reverted edits as patrolled
2732                         $set['rc_patrolled'] = 1;
2733                 }
2734
2735                 if ( count( $set ) ) {
2736                         $dbw->update( 'recentchanges', $set,
2737                                 array( /* WHERE */
2738                                         'rc_cur_id' => $current->getPage(),
2739                                         'rc_user_text' => $current->getUserText(),
2740                                         "rc_timestamp > '{$s->rev_timestamp}'",
2741                                 ), __METHOD__
2742                         );
2743                 }
2744
2745                 # Generate the edit summary if necessary
2746                 $target = Revision::newFromId( $s->rev_id );
2747                 if ( empty( $summary ) ) {
2748                         if ( $from == '' ) { // no public user name
2749                                 $summary = wfMsgForContent( 'revertpage-nouser' );
2750                         } else {
2751                                 $summary = wfMsgForContent( 'revertpage' );
2752                         }
2753                 }
2754
2755                 # Allow the custom summary to use the same args as the default message
2756                 $args = array(
2757                         $target->getUserText(), $from, $s->rev_id,
2758                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2759                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2760                 );
2761                 $summary = wfMsgReplaceArgs( $summary, $args );
2762
2763                 # Save
2764                 $flags = EDIT_UPDATE;
2765
2766                 if ( $guser->isAllowed( 'minoredit' ) ) {
2767                         $flags |= EDIT_MINOR;
2768                 }
2769
2770                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2771                         $flags |= EDIT_FORCE_BOT;
2772                 }
2773
2774                 # Actually store the edit
2775                 $status = $this->doEditContent( $target->getContent(), $summary, $flags, $target->getId(), $guser );
2776                 if ( !empty( $status->value['revision'] ) ) {
2777                         $revId = $status->value['revision']->getId();
2778                 } else {
2779                         $revId = false;
2780                 }
2781
2782                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
2783
2784                 $resultDetails = array(
2785                         'summary' => $summary,
2786                         'current' => $current,
2787                         'target'  => $target,
2788                         'newid'   => $revId
2789                 );
2790
2791                 return array();
2792         }
2793
2794         /**
2795          * The onArticle*() functions are supposed to be a kind of hooks
2796          * which should be called whenever any of the specified actions
2797          * are done.
2798          *
2799          * This is a good place to put code to clear caches, for instance.
2800          *
2801          * This is called on page move and undelete, as well as edit
2802          *
2803          * @param $title Title object
2804          */
2805         public static function onArticleCreate( $title ) {
2806                 # Update existence markers on article/talk tabs...
2807                 if ( $title->isTalkPage() ) {
2808                         $other = $title->getSubjectPage();
2809                 } else {
2810                         $other = $title->getTalkPage();
2811                 }
2812
2813                 $other->invalidateCache();
2814                 $other->purgeSquid();
2815
2816                 $title->touchLinks();
2817                 $title->purgeSquid();
2818                 $title->deleteTitleProtection();
2819         }
2820
2821         /**
2822          * Clears caches when article is deleted
2823          *
2824          * @param $title Title
2825          */
2826         public static function onArticleDelete( $title ) {
2827                 # Update existence markers on article/talk tabs...
2828                 if ( $title->isTalkPage() ) {
2829                         $other = $title->getSubjectPage();
2830                 } else {
2831                         $other = $title->getTalkPage();
2832                 }
2833
2834                 $other->invalidateCache();
2835                 $other->purgeSquid();
2836
2837                 $title->touchLinks();
2838                 $title->purgeSquid();
2839
2840                 # File cache
2841                 HTMLFileCache::clearFileCache( $title );
2842
2843                 # Messages
2844                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2845                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2846                 }
2847
2848                 # Images
2849                 if ( $title->getNamespace() == NS_FILE ) {
2850                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2851                         $update->doUpdate();
2852                 }
2853
2854                 # User talk pages
2855                 if ( $title->getNamespace() == NS_USER_TALK ) {
2856                         $user = User::newFromName( $title->getText(), false );
2857                         if ( $user ) {
2858                                 $user->setNewtalk( false );
2859                         }
2860                 }
2861
2862                 # Image redirects
2863                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2864         }
2865
2866         /**
2867          * Purge caches on page update etc
2868          *
2869          * @param $title Title object
2870          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2871          */
2872         public static function onArticleEdit( $title ) {
2873                 // Invalidate caches of articles which include this page
2874                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2875
2876
2877                 // Invalidate the caches of all pages which redirect here
2878                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2879
2880                 # Purge squid for this page only
2881                 $title->purgeSquid();
2882
2883                 # Clear file cache for this page only
2884                 HTMLFileCache::clearFileCache( $title );
2885         }
2886
2887         /**#@-*/
2888
2889         /**
2890          * Returns a list of hidden categories this page is a member of.
2891          * Uses the page_props and categorylinks tables.
2892          *
2893          * @return Array of Title objects
2894          */
2895         public function getHiddenCategories() {
2896                 $result = array();
2897                 $id = $this->mTitle->getArticleID();
2898
2899                 if ( $id == 0 ) {
2900                         return array();
2901                 }
2902
2903                 $dbr = wfGetDB( DB_SLAVE );
2904                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2905                         array( 'cl_to' ),
2906                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2907                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2908                         __METHOD__ );
2909
2910                 if ( $res !== false ) {
2911                         foreach ( $res as $row ) {
2912                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2913                         }
2914                 }
2915
2916                 return $result;
2917         }
2918
2919         /**
2920         * Return an applicable autosummary if one exists for the given edit.
2921         * @param $oldtext String|null: the previous text of the page.
2922         * @param $newtext String|null: The submitted text of the page.
2923         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2924         * @return string An appropriate autosummary, or an empty string.
2925         *
2926         * @deprecated since 1.WD, use ContentHandler::getAutosummary() instead
2927         */
2928         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2929                 # NOTE: stub for backwards-compatibility. assumes the given text is wikitext. will break horribly if it isn't.
2930
2931                 wfDeprecated( __METHOD__, '1.WD' );
2932
2933                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
2934                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
2935                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
2936
2937                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
2938         }
2939
2940         /**
2941          * Auto-generates a deletion reason
2942          *
2943          * @param &$hasHistory Boolean: whether the page has a history
2944          * @return mixed String containing deletion reason or empty string, or boolean false
2945          *    if no revision occurred
2946          */
2947         public function getAutoDeleteReason( &$hasHistory ) {
2948                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
2949         }
2950
2951         /**
2952          * Update all the appropriate counts in the category table, given that
2953          * we've added the categories $added and deleted the categories $deleted.
2954          *
2955          * @param $added array   The names of categories that were added
2956          * @param $deleted array The names of categories that were deleted
2957          */
2958         public function updateCategoryCounts( $added, $deleted ) {
2959                 $ns = $this->mTitle->getNamespace();
2960                 $dbw = wfGetDB( DB_MASTER );
2961
2962                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2963                 # exist, we might legitimately not create it, but it's simpler to just
2964                 # create it and then give it a negative value, since the value is bogus
2965                 # anyway.
2966                 #
2967                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2968                 $insertCats = array_merge( $added, $deleted );
2969                 if ( !$insertCats ) {
2970                         # Okay, nothing to do
2971                         return;
2972                 }
2973
2974                 $insertRows = array();
2975
2976                 foreach ( $insertCats as $cat ) {
2977                         $insertRows[] = array(
2978                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2979                                 'cat_title' => $cat
2980                         );
2981                 }
2982                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2983
2984                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2985                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2986
2987                 if ( $ns == NS_CATEGORY ) {
2988                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2989                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2990                 } elseif ( $ns == NS_FILE ) {
2991                         $addFields[]    = 'cat_files = cat_files + 1';
2992                         $removeFields[] = 'cat_files = cat_files - 1';
2993                 }
2994
2995                 if ( $added ) {
2996                         $dbw->update(
2997                                 'category',
2998                                 $addFields,
2999                                 array( 'cat_title' => $added ),
3000                                 __METHOD__
3001                         );
3002                 }
3003
3004                 if ( $deleted ) {
3005                         $dbw->update(
3006                                 'category',
3007                                 $removeFields,
3008                                 array( 'cat_title' => $deleted ),
3009                                 __METHOD__
3010                         );
3011                 }
3012         }
3013
3014         /**
3015          * Updates cascading protections
3016          *
3017          * @param $parserOutput ParserOutput object for the current version
3018          */
3019         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
3020                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
3021                         return;
3022                 }
3023
3024                 // templatelinks table may have become out of sync,
3025                 // especially if using variable-based transclusions.
3026                 // For paranoia, check if things have changed and if
3027                 // so apply updates to the database. This will ensure
3028                 // that cascaded protections apply as soon as the changes
3029                 // are visible.
3030
3031                 # Get templates from templatelinks
3032                 $id = $this->mTitle->getArticleID();
3033
3034                 $tlTemplates = array();
3035
3036                 $dbr = wfGetDB( DB_SLAVE );
3037                 $res = $dbr->select( array( 'templatelinks' ),
3038                         array( 'tl_namespace', 'tl_title' ),
3039                         array( 'tl_from' => $id ),
3040                         __METHOD__
3041                 );
3042
3043                 foreach ( $res as $row ) {
3044                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
3045                 }
3046
3047                 # Get templates from parser output.
3048                 $poTemplates = array();
3049                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3050                         foreach ( $templates as $dbk => $id ) {
3051                                 $poTemplates["$ns:$dbk"] = true;
3052                         }
3053                 }
3054
3055                 # Get the diff
3056                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
3057
3058                 if ( count( $templates_diff ) > 0 ) {
3059                         # Whee, link updates time.
3060                         # Note: we are only interested in links here. We don't need to get other DataUpdate items from the parser output.
3061                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3062                         $u->doUpdate();
3063                 }
3064         }
3065
3066         /**
3067          * Return a list of templates used by this article.
3068          * Uses the templatelinks table
3069          *
3070          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
3071          * @return Array of Title objects
3072          */
3073         public function getUsedTemplates() {
3074                 return $this->mTitle->getTemplateLinksFrom();
3075         }
3076
3077         /**
3078          * Perform article updates on a special page creation.
3079          *
3080          * @param $rev Revision object
3081          *
3082          * @todo This is a shitty interface function. Kill it and replace the
3083          * other shitty functions like doEditUpdates and such so it's not needed
3084          * anymore.
3085          * @deprecated since 1.18, use doEditUpdates()
3086          */
3087         public function createUpdates( $rev ) {
3088                 wfDeprecated( __METHOD__, '1.18' );
3089                 global $wgUser;
3090                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
3091         }
3092
3093         /**
3094          * This function is called right before saving the wikitext,
3095          * so we can do things like signatures and links-in-context.
3096          *
3097          * @deprecated in 1.19; use Parser::preSaveTransform() instead
3098          * @param $text String article contents
3099          * @param $user User object: user doing the edit
3100          * @param $popts ParserOptions object: parser options, default options for
3101          *               the user loaded if null given
3102          * @return string article contents with altered wikitext markup (signatures
3103          *      converted, {{subst:}}, templates, etc.)
3104          */
3105         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3106                 global $wgParser, $wgUser;
3107
3108                 wfDeprecated( __METHOD__, '1.19' );
3109
3110                 $user = is_null( $user ) ? $wgUser : $user;
3111
3112                 if ( $popts === null ) {
3113                         $popts = ParserOptions::newFromUser( $user );
3114                 }
3115
3116                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3117         }
3118
3119         /**
3120          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
3121          *
3122          * @deprecated in 1.19; use Title::isBigDeletion() instead.
3123          * @return bool
3124          */
3125         public function isBigDeletion() {
3126                 wfDeprecated( __METHOD__, '1.19' );
3127                 return $this->mTitle->isBigDeletion();
3128         }
3129
3130         /**
3131          * Get the  approximate revision count of this page.
3132          *
3133          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
3134          * @return int
3135          */
3136         public function estimateRevisionCount() {
3137                 wfDeprecated( __METHOD__, '1.19' );
3138                 return $this->mTitle->estimateRevisionCount();
3139         }
3140
3141         /**
3142          * Update the article's restriction field, and leave a log entry.
3143          *
3144          * @deprecated since 1.19
3145          * @param $limit Array: set of restriction keys
3146          * @param $reason String
3147          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
3148          * @param $expiry Array: per restriction type expiration
3149          * @param $user User The user updating the restrictions
3150          * @return bool true on success
3151          */
3152         public function updateRestrictions(
3153                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
3154         ) {
3155                 global $wgUser;
3156
3157                 $user = is_null( $user ) ? $wgUser : $user;
3158
3159                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
3160         }
3161
3162         /**
3163          * @deprecated since 1.18
3164          */
3165         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3166                 wfDeprecated( __METHOD__, '1.18' );
3167                 global $wgUser;
3168                 $this->doQuickEdit( $text, $wgUser, $comment, $minor );
3169         }
3170
3171         /**
3172          * @deprecated since 1.18
3173          */
3174         public function viewUpdates() {
3175                 wfDeprecated( __METHOD__, '1.18' );
3176                 global $wgUser;
3177                 return $this->doViewUpdates( $wgUser );
3178         }
3179
3180         /**
3181          * @deprecated since 1.18
3182          * @return bool
3183          */
3184         public function useParserCache( $oldid ) {
3185                 wfDeprecated( __METHOD__, '1.18' );
3186                 global $wgUser;
3187                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
3188         }
3189
3190         /**
3191          * Returns a list of updates to be performed when this page is deleted. The updates should remove any information
3192          * about this page from secondary data stores such as links tables.
3193          *
3194          * @param Content|null $content optional Content object for determining the necessary updates
3195          * @return Array an array of DataUpdates objects
3196          */
3197         public function getDeletionUpdates( Content $content = null ) {
3198                 if ( !$content ) {
3199                         // load content object, which may be used to determine the necessary updates
3200                         // XXX: the content may not be needed to determine the updates, then this would be overhead.
3201                         $content = $this->getContent( Revision::RAW );
3202                 }
3203
3204                 if ( !$content ) {
3205                         $updates = array();
3206                 } else {
3207                         $updates = $content->getDeletionUpdates( $this->mTitle );
3208                 }
3209
3210                 wfRunHooks( 'WikiPageDeletionUpdates', array( $this, $content, &$updates ) );
3211                 return $updates;
3212         }
3213
3214 }
3215
3216 class PoolWorkArticleView extends PoolCounterWork {
3217
3218         /**
3219          * @var Page
3220          */
3221         private $page;
3222
3223         /**
3224          * @var string
3225          */
3226         private $cacheKey;
3227
3228         /**
3229          * @var integer
3230          */
3231         private $revid;
3232
3233         /**
3234          * @var ParserOptions
3235          */
3236         private $parserOptions;
3237
3238         /**
3239          * @var Content|null
3240          */
3241         private $content = null;
3242
3243         /**
3244          * @var ParserOutput|bool
3245          */
3246         private $parserOutput = false;
3247
3248         /**
3249          * @var bool
3250          */
3251         private $isDirty = false;
3252
3253         /**
3254          * @var Status|bool
3255          */
3256         private $error = false;
3257
3258         /**
3259          * Constructor
3260          *
3261          * @param $page Page
3262          * @param $revid Integer: ID of the revision being parsed
3263          * @param $useParserCache Boolean: whether to use the parser cache
3264          * @param $parserOptions parserOptions to use for the parse operation
3265          * @param $content Content|String: content to parse or null to load it; may also be given as a wikitext string, for BC
3266          */
3267         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $content = null ) {
3268                 if ( is_string($content) ) { #BC: old style call
3269                         $modelId = $page->getRevision()->getContentModel();
3270                         $format = $page->getRevision()->getContentFormat();
3271                         $content = ContentHandler::makeContent( $content, $page->getTitle(), $modelId, $format );
3272                 }
3273
3274                 $this->page = $page;
3275                 $this->revid = $revid;
3276                 $this->cacheable = $useParserCache;
3277                 $this->parserOptions = $parserOptions;
3278                 $this->content = $content;
3279                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
3280                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
3281         }
3282
3283         /**
3284          * Get the ParserOutput from this object, or false in case of failure
3285          *
3286          * @return ParserOutput
3287          */
3288         public function getParserOutput() {
3289                 return $this->parserOutput;
3290         }
3291
3292         /**
3293          * Get whether the ParserOutput is a dirty one (i.e. expired)
3294          *
3295          * @return bool
3296          */
3297         public function getIsDirty() {
3298                 return $this->isDirty;
3299         }
3300
3301         /**
3302          * Get a Status object in case of error or false otherwise
3303          *
3304          * @return Status|bool
3305          */
3306         public function getError() {
3307                 return $this->error;
3308         }
3309
3310         /**
3311          * @return bool
3312          */
3313         function doWork() {
3314                 global $wgUseFileCache;
3315
3316                 // @todo: several of the methods called on $this->page are not declared in Page, but present in WikiPage and delegated by Article.
3317
3318                 $isCurrent = $this->revid === $this->page->getLatest();
3319
3320                 if ( $this->content !== null ) {
3321                         $content = $this->content;
3322                 } elseif ( $isCurrent ) {
3323                         $content = $this->page->getContent( Revision::RAW ); #XXX: why use RAW audience here, and PUBLIC (default) below?
3324                 } else {
3325                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
3326                         if ( $rev === null ) {
3327                                 return false;
3328                         }
3329                         $content = $rev->getContent(); #XXX: why use PUBLIC audience here (default), and RAW above?
3330                 }
3331
3332                 $time = - microtime( true );
3333                 $this->parserOutput = $content->getParserOutput( $this->page->getTitle(), $this->revid, $this->parserOptions );
3334                 $time += microtime( true );
3335
3336                 # Timing hack
3337                 if ( $time > 3 ) {
3338                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
3339                                 $this->page->getTitle()->getPrefixedDBkey() ) );
3340                 }
3341
3342                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
3343                         ParserCache::singleton()->save( $this->parserOutput, $this->page, $this->parserOptions );
3344                 }
3345
3346                 // Make sure file cache is not used on uncacheable content.
3347                 // Output that has magic words in it can still use the parser cache
3348                 // (if enabled), though it will generally expire sooner.
3349                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
3350                         $wgUseFileCache = false;
3351                 }
3352
3353                 if ( $isCurrent ) {
3354                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
3355                 }
3356
3357                 return true;
3358         }
3359
3360         /**
3361          * @return bool
3362          */
3363         function getCachedWork() {
3364                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
3365
3366                 if ( $this->parserOutput === false ) {
3367                         wfDebug( __METHOD__ . ": parser cache miss\n" );
3368                         return false;
3369                 } else {
3370                         wfDebug( __METHOD__ . ": parser cache hit\n" );
3371                         return true;
3372                 }
3373         }
3374
3375         /**
3376          * @return bool
3377          */
3378         function fallback() {
3379                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
3380
3381                 if ( $this->parserOutput === false ) {
3382                         wfDebugLog( 'dirty', "dirty missing\n" );
3383                         wfDebug( __METHOD__ . ": no dirty cache\n" );
3384                         return false;
3385                 } else {
3386                         wfDebug( __METHOD__ . ": sending dirty output\n" );
3387                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
3388                         $this->isDirty = true;
3389                         return true;
3390                 }
3391         }
3392
3393         /**
3394          * @param $status Status
3395          * @return bool
3396          */
3397         function error( $status ) {
3398                 $this->error = $status;
3399                 return false;
3400         }
3401 }
3402