includes/WikiPage.php

   1 <?php
   2 /**
   3  * Abstract class for type hinting (accepts WikiPage, Article, ImagePage, CategoryPage)
   4  */
   5 abstract class Page {}
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * Some fields are public only for backwards-compatibility. Use accessors.
  11  * In the past, this class was part of Article.php and everything was public.
  12  *
  13  * @internal documentation reviewed 15 Mar 2010
  14  */
  15 class WikiPage extends Page {
  16         /**
  17          * @var Title
  18          */
  19         public $mTitle = null;
  20
  21         /**@{{
  22          * @protected
  23          */
  24         public $mCounter = -1;               // !< Integer (-1 means "not loaded")
  25         public $mDataLoaded = false;         // !< Boolean
  26         public $mIsRedirect = false;         // !< Boolean
  27         public $mLatest = false;             // !< Integer (false means "not loaded")
  28         public $mPreparedEdit = false;           // !< Array
  29
  30         /**
  31          * @var Title
  32          */
  33         protected $mRedirectTarget = null;
  34
  35         /**
  36          * @var Revision
  37          */
  38         protected $mLastRevision = null;
  39
  40         protected $mTimestamp = '';             // !< String
  41         protected $mTouched = '19700101000000'; // !< String
  42         /**@}}*/
  43
  44         /**
  45          * Constructor and clear the article
  46          * @param $title Title Reference to a Title object.
  47          */
  48         public function __construct( Title $title ) {
  49                 $this->mTitle = $title;
  50         }
  51
  52         /**
  53          * Create a WikiPage object of the appropriate class for the given title.
  54          *
  55          * @param $title Title
  56          * @return WikiPage object of the appropriate type
  57          */
  58         public static function factory( Title $title ) {
  59                 $ns = $title->getNamespace();
  60
  61                 if ( $ns == NS_MEDIA ) {
  62                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
  63                 } elseif ( $ns < 0 ) {
  64                         throw new MWException( "Invalid or virtual namespace $ns given." );
  65                 }
  66
  67                 switch ( $ns ) {
  68                         case NS_FILE:
  69                                 $page = new WikiFilePage( $title );
  70                                 break;
  71                         case NS_CATEGORY:
  72                                 $page = new WikiCategoryPage( $title );
  73                                 break;
  74                         default:
  75                                 $page = new WikiPage( $title );
  76                 }
  77
  78                 return $page;
  79         }
  80
  81         /**
  82          * Constructor from a page id
  83          *
  84          * @param $id Int article ID to load
  85          *
  86          * @return WikiPage
  87          */
  88         public static function newFromID( $id ) {
  89                 $t = Title::newFromID( $id );
  90                 if ( $t ) {
  91                         return self::factory( $t );
  92                 }
  93                 return null;
  94         }
  95
  96         /**
  97          * Returns overrides for action handlers.
  98          * Classes listed here will be used instead of the default one when
  99          * (and only when) $wgActions[$action] === true. This allows subclasses
 100          * to override the default behavior.
 101          *
 102          * @todo: move this UI stuff somewhere else
 103          *
 104          * @return Array
 105          */
 106         public function getActionOverrides() {
 107                 return array();
 108         }
 109
 110         /**
 111          * If this page is a redirect, get its target
 112          *
 113          * The target will be fetched from the redirect table if possible.
 114          * If this page doesn't have an entry there, call insertRedirect()
 115          * @return Title|mixed object, or null if this page is not a redirect
 116          */
 117         public function getRedirectTarget() {
 118                 if ( !$this->mTitle->isRedirect() ) {
 119                         return null;
 120                 }
 121
 122                 if ( $this->mRedirectTarget !== null ) {
 123                         return $this->mRedirectTarget;
 124                 }
 125
 126                 # Query the redirect table
 127                 $dbr = wfGetDB( DB_SLAVE );
 128                 $row = $dbr->selectRow( 'redirect',
 129                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 130                         array( 'rd_from' => $this->getId() ),
 131                         __METHOD__
 132                 );
 133
 134                 // rd_fragment and rd_interwiki were added later, populate them if empty
 135                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 136                         return $this->mRedirectTarget = Title::makeTitle(
 137                                 $row->rd_namespace, $row->rd_title,
 138                                 $row->rd_fragment, $row->rd_interwiki );
 139                 }
 140
 141                 # This page doesn't have an entry in the redirect table
 142                 return $this->mRedirectTarget = $this->insertRedirect();
 143         }
 144
 145         /**
 146          * Insert an entry for this page into the redirect table.
 147          *
 148          * Don't call this function directly unless you know what you're doing.
 149          * @return Title object or null if not a redirect
 150          */
 151         public function insertRedirect() {
 152                 // recurse through to only get the final target
 153                 $retval = Title::newFromRedirectRecurse( $this->getRawText() );
 154                 if ( !$retval ) {
 155                         return null;
 156                 }
 157                 $this->insertRedirectEntry( $retval );
 158                 return $retval;
 159         }
 160
 161         /**
 162          * Insert or update the redirect table entry for this page to indicate
 163          * it redirects to $rt .
 164          * @param $rt Title redirect target
 165          */
 166         public function insertRedirectEntry( $rt ) {
 167                 $dbw = wfGetDB( DB_MASTER );
 168                 $dbw->replace( 'redirect', array( 'rd_from' ),
 169                         array(
 170                                 'rd_from'      => $this->getId(),
 171                                 'rd_namespace' => $rt->getNamespace(),
 172                                 'rd_title'     => $rt->getDBkey(),
 173                                 'rd_fragment'  => $rt->getFragment(),
 174                                 'rd_interwiki' => $rt->getInterwiki(),
 175                         ),
 176                         __METHOD__
 177                 );
 178         }
 179
 180         /**
 181          * Get the Title object or URL this page redirects to
 182          *
 183          * @return mixed false, Title of in-wiki target, or string with URL
 184          */
 185         public function followRedirect() {
 186                 return $this->getRedirectURL( $this->getRedirectTarget() );
 187         }
 188
 189         /**
 190          * Get the Title object or URL to use for a redirect. We use Title
 191          * objects for same-wiki, non-special redirects and URLs for everything
 192          * else.
 193          * @param $rt Title Redirect target
 194          * @return mixed false, Title object of local target, or string with URL
 195          */
 196         public function getRedirectURL( $rt ) {
 197                 if ( $rt ) {
 198                         if ( $rt->getInterwiki() != '' ) {
 199                                 if ( $rt->isLocal() ) {
 200                                         // Offsite wikis need an HTTP redirect.
 201                                         //
 202                                         // This can be hard to reverse and may produce loops,
 203                                         // so they may be disabled in the site configuration.
 204                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 205                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 206                                 }
 207                         } else {
 208                                 if ( $rt->isSpecialPage() ) {
 209                                         // Gotta handle redirects to special pages differently:
 210                                         // Fill the HTTP response "Location" header and ignore
 211                                         // the rest of the page we're on.
 212                                         //
 213                                         // This can be hard to reverse, so they may be disabled.
 214                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 215                                                 // rolleyes
 216                                         } else {
 217                                                 return $rt->getFullURL();
 218                                         }
 219                                 }
 220
 221                                 return $rt;
 222                         }
 223                 }
 224
 225                 // No or invalid redirect
 226                 return false;
 227         }
 228
 229         /**
 230          * Get the title object of the article
 231          * @return Title object of this page
 232          */
 233         public function getTitle() {
 234                 return $this->mTitle;
 235         }
 236
 237         /**
 238          * Clear the object
 239          */
 240         public function clear() {
 241                 $this->mDataLoaded = false;
 242
 243                 $this->mCounter = -1; # Not loaded
 244                 $this->mRedirectTarget = null; # Title object if set
 245                 $this->mLastRevision = null; # Latest revision
 246                 $this->mTimestamp = '';
 247                 $this->mTouched = '19700101000000';
 248                 $this->mIsRedirect = false;
 249                 $this->mLatest = false;
 250                 $this->mPreparedEdit = false;
 251         }
 252
 253         /**
 254          * Get the text that needs to be saved in order to undo all revisions
 255          * between $undo and $undoafter. Revisions must belong to the same page,
 256          * must exist and must not be deleted
 257          * @param $undo Revision
 258          * @param $undoafter Revision Must be an earlier revision than $undo
 259          * @return mixed string on success, false on failure
 260          */
 261         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 262                 $cur_text = $this->getRawText();
 263                 if ( $cur_text === false ) {
 264                         return false; // no page
 265                 }
 266                 $undo_text = $undo->getText();
 267                 $undoafter_text = $undoafter->getText();
 268
 269                 if ( $cur_text == $undo_text ) {
 270                         # No use doing a merge if it's just a straight revert.
 271                         return $undoafter_text;
 272                 }
 273
 274                 $undone_text = '';
 275
 276                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
 277                         return false;
 278                 }
 279
 280                 return $undone_text;
 281         }
 282
 283         /**
 284          * Return the list of revision fields that should be selected to create
 285          * a new page.
 286          *
 287          * @return array
 288          */
 289         public static function selectFields() {
 290                 return array(
 291                         'page_id',
 292                         'page_namespace',
 293                         'page_title',
 294                         'page_restrictions',
 295                         'page_counter',
 296                         'page_is_redirect',
 297                         'page_is_new',
 298                         'page_random',
 299                         'page_touched',
 300                         'page_latest',
 301                         'page_len',
 302                 );
 303         }
 304
 305         /**
 306          * Fetch a page record with the given conditions
 307          * @param $dbr DatabaseBase object
 308          * @param $conditions Array
 309          * @return mixed Database result resource, or false on failure
 310          */
 311         protected function pageData( $dbr, $conditions ) {
 312                 $fields = self::selectFields();
 313
 314                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 315
 316                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 317
 318                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 319
 320                 return $row;
 321         }
 322
 323         /**
 324          * Fetch a page record matching the Title object's namespace and title
 325          * using a sanitized title string
 326          *
 327          * @param $dbr DatabaseBase object
 328          * @param $title Title object
 329          * @return mixed Database result resource, or false on failure
 330          */
 331         public function pageDataFromTitle( $dbr, $title ) {
 332                 return $this->pageData( $dbr, array(
 333                         'page_namespace' => $title->getNamespace(),
 334                         'page_title'     => $title->getDBkey() ) );
 335         }
 336
 337         /**
 338          * Fetch a page record matching the requested ID
 339          *
 340          * @param $dbr DatabaseBase
 341          * @param $id Integer
 342          * @return mixed Database result resource, or false on failure
 343          */
 344         public function pageDataFromId( $dbr, $id ) {
 345                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 346         }
 347
 348         /**
 349          * Set the general counter, title etc data loaded from
 350          * some source.
 351          *
 352          * @param $data Object|String One of the following:
 353          *              A DB query result object or...
 354          *              "fromdb" to get from a slave DB or...
 355          *              "fromdbmaster" to get from the master DB
 356          * @return void
 357          */
 358         public function loadPageData( $data = 'fromdb' ) {
 359                 if ( $data === 'fromdbmaster' ) {
 360                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 361                 } elseif ( $data === 'fromdb' ) { // slave
 362                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 363                         # Use a "last rev inserted" timestamp key to dimish the issue of slave lag.
 364                         # Note that DB also stores the master position in the session and checks it.
 365                         $touched = $this->getCachedLastEditTime();
 366                         if ( $touched ) { // key set
 367                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 368                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 369                                 }
 370                         }
 371                 }
 372
 373                 $lc = LinkCache::singleton();
 374
 375                 if ( $data ) {
 376                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 377
 378                         $this->mTitle->loadFromRow( $data );
 379
 380                         # Old-fashioned restrictions
 381                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 382
 383                         $this->mCounter     = intval( $data->page_counter );
 384                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 385                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 386                         $this->mLatest      = intval( $data->page_latest );
 387                 } else {
 388                         $lc->addBadLinkObj( $this->mTitle );
 389
 390                         $this->mTitle->loadFromRow( false );
 391                 }
 392
 393                 $this->mDataLoaded = true;
 394         }
 395
 396         /**
 397          * @return int Page ID
 398          */
 399         public function getId() {
 400                 return $this->mTitle->getArticleID();
 401         }
 402
 403         /**
 404          * @return bool Whether or not the page exists in the database
 405          */
 406         public function exists() {
 407                 return $this->getId() > 0;
 408         }
 409
 410         /**
 411          * Check if this page is something we're going to be showing
 412          * some sort of sensible content for. If we return false, page
 413          * views (plain action=view) will return an HTTP 404 response,
 414          * so spiders and robots can know they're following a bad link.
 415          *
 416          * @return bool
 417          */
 418         public function hasViewableContent() {
 419                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 420         }
 421
 422         /**
 423          * @return int The view count for the page
 424          */
 425         public function getCount() {
 426                 if ( -1 == $this->mCounter ) {
 427                         $id = $this->getId();
 428
 429                         if ( $id == 0 ) {
 430                                 $this->mCounter = 0;
 431                         } else {
 432                                 $dbr = wfGetDB( DB_SLAVE );
 433                                 $this->mCounter = $dbr->selectField( 'page',
 434                                         'page_counter',
 435                                         array( 'page_id' => $id ),
 436                                         __METHOD__
 437                                 );
 438                         }
 439                 }
 440
 441                 return $this->mCounter;
 442         }
 443
 444         /**
 445          * Determine whether a page would be suitable for being counted as an
 446          * article in the site_stats table based on the title & its content
 447          *
 448          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 449          *        if false, the current database state will be used
 450          * @return Boolean
 451          */
 452         public function isCountable( $editInfo = false ) {
 453                 global $wgArticleCountMethod;
 454
 455                 if ( !$this->mTitle->isContentPage() ) {
 456                         return false;
 457                 }
 458
 459                 $text = $editInfo ? $editInfo->pst : false;
 460
 461                 if ( $this->isRedirect( $text ) ) {
 462                         return false;
 463                 }
 464
 465                 switch ( $wgArticleCountMethod ) {
 466                 case 'any':
 467                         return true;
 468                 case 'comma':
 469                         if ( $text === false ) {
 470                                 $text = $this->getRawText();
 471                         }
 472                         return strpos( $text,  ',' ) !== false;
 473                 case 'link':
 474                         if ( $editInfo ) {
 475                                 // ParserOutput::getLinks() is a 2D array of page links, so
 476                                 // to be really correct we would need to recurse in the array
 477                                 // but the main array should only have items in it if there are
 478                                 // links.
 479                                 return (bool)count( $editInfo->output->getLinks() );
 480                         } else {
 481                                 return (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 482                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 483                         }
 484                 }
 485         }
 486
 487         /**
 488          * Tests if the article text represents a redirect
 489          *
 490          * @param $text mixed string containing article contents, or boolean
 491          * @return bool
 492          */
 493         public function isRedirect( $text = false ) {
 494                 if ( $text === false ) {
 495                         if ( !$this->mDataLoaded ) {
 496                                 $this->loadPageData();
 497                         }
 498
 499                         return (bool)$this->mIsRedirect;
 500                 } else {
 501                         return Title::newFromRedirect( $text ) !== null;
 502                 }
 503         }
 504
 505         /**
 506          * Loads everything except the text
 507          * This isn't necessary for all uses, so it's only done if needed.
 508          */
 509         protected function loadLastEdit() {
 510                 if ( $this->mLastRevision !== null ) {
 511                         return; // already loaded
 512                 }
 513
 514                 $latest = $this->getLatest();
 515                 if ( !$latest ) {
 516                         return; // page doesn't exist or is missing page_latest info
 517                 }
 518
 519                 $revision = Revision::newFromPageId( $this->getId(), $latest );
 520                 if ( $revision ) { // sanity
 521                         $this->setLastEdit( $revision );
 522                 }
 523         }
 524
 525         /**
 526          * Set the latest revision
 527          */
 528         protected function setLastEdit( Revision $revision ) {
 529                 $this->mLastRevision = $revision;
 530                 $this->mTimestamp = $revision->getTimestamp();
 531         }
 532
 533         /**
 534          * Get the latest revision
 535          * @return Revision|null
 536          */
 537         public function getRevision() {
 538                 $this->loadLastEdit();
 539                 if ( $this->mLastRevision ) {
 540                         return $this->mLastRevision;
 541                 }
 542                 return null;
 543         }
 544
 545         /**
 546          * Get the text of the current revision. No side-effects...
 547          *
 548          * @param $audience Integer: one of:
 549          *      Revision::FOR_PUBLIC       to be displayed to all users
 550          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 551          *      Revision::RAW              get the text regardless of permissions
 552          * @return String|false The text of the current revision
 553          */
 554         public function getText( $audience = Revision::FOR_PUBLIC ) {
 555                 $this->loadLastEdit();
 556                 if ( $this->mLastRevision ) {
 557                         return $this->mLastRevision->getText( $audience );
 558                 }
 559                 return false;
 560         }
 561
 562         /**
 563          * Get the text of the current revision. No side-effects...
 564          *
 565          * @return String|false The text of the current revision
 566          */
 567         public function getRawText() {
 568                 $this->loadLastEdit();
 569                 if ( $this->mLastRevision ) {
 570                         return $this->mLastRevision->getRawText();
 571                 }
 572                 return false;
 573         }
 574
 575         /**
 576          * @return string MW timestamp of last article revision
 577          */
 578         public function getTimestamp() {
 579                 // Check if the field has been filled by WikiPage::setTimestamp()
 580                 if ( !$this->mTimestamp ) {
 581                         $this->loadLastEdit();
 582                 }
 583                 return wfTimestamp( TS_MW, $this->mTimestamp );
 584         }
 585
 586         /**
 587          * Set the page timestamp (use only to avoid DB queries)
 588          * @param $ts string MW timestamp of last article revision
 589          * @return void
 590          */
 591         public function setTimestamp( $ts ) {
 592                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 593         }
 594
 595         /**
 596          * @param $audience Integer: one of:
 597          *      Revision::FOR_PUBLIC       to be displayed to all users
 598          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 599          *      Revision::RAW              get the text regardless of permissions
 600          * @return int user ID for the user that made the last article revision
 601          */
 602         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 603                 $this->loadLastEdit();
 604                 if ( $this->mLastRevision ) {
 605                         return $this->mLastRevision->getUser( $audience );
 606                 } else {
 607                         return -1;
 608                 }
 609         }
 610
 611         /**
 612          * @param $audience Integer: one of:
 613          *      Revision::FOR_PUBLIC       to be displayed to all users
 614          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 615          *      Revision::RAW              get the text regardless of permissions
 616          * @return string username of the user that made the last article revision
 617          */
 618         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 619                 $this->loadLastEdit();
 620                 if ( $this->mLastRevision ) {
 621                         return $this->mLastRevision->getUserText( $audience );
 622                 } else {
 623                         return '';
 624                 }
 625         }
 626
 627         /**
 628          * @param $audience Integer: one of:
 629          *      Revision::FOR_PUBLIC       to be displayed to all users
 630          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 631          *      Revision::RAW              get the text regardless of permissions
 632          * @return string Comment stored for the last article revision
 633          */
 634         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 635                 $this->loadLastEdit();
 636                 if ( $this->mLastRevision ) {
 637                         return $this->mLastRevision->getComment( $audience );
 638                 } else {
 639                         return '';
 640                 }
 641         }
 642
 643         /**
 644          * Returns true if last revision was marked as "minor edit"
 645          *
 646          * @return boolean Minor edit indicator for the last article revision.
 647          */
 648         public function getMinorEdit() {
 649                 $this->loadLastEdit();
 650                 if ( $this->mLastRevision ) {
 651                         return $this->mLastRevision->isMinor();
 652                 } else {
 653                         return false;
 654                 }
 655         }
 656
 657         /**
 658          * Get a list of users who have edited this article, not including the user who made
 659          * the most recent revision, which you can get from $article->getUser() if you want it
 660          * @return UserArrayFromResult
 661          */
 662         public function getContributors() {
 663                 # @todo FIXME: This is expensive; cache this info somewhere.
 664
 665                 $dbr = wfGetDB( DB_SLAVE );
 666
 667                 if ( $dbr->implicitGroupby() ) {
 668                         $realNameField = 'user_real_name';
 669                 } else {
 670                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 671                 }
 672
 673                 $tables = array( 'revision', 'user' );
 674
 675                 $fields = array(
 676                         'rev_user as user_id',
 677                         'rev_user_text AS user_name',
 678                         $realNameField,
 679                         'MAX(rev_timestamp) AS timestamp',
 680                 );
 681
 682                 $conds = array( 'rev_page' => $this->getId() );
 683
 684                 // The user who made the top revision gets credited as "this page was last edited by
 685                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 686                 $user = $this->getUser();
 687                 if ( $user ) {
 688                         $conds[] = "rev_user != $user";
 689                 } else {
 690                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 691                 }
 692
 693                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 694
 695                 $jconds = array(
 696                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 697                 );
 698
 699                 $options = array(
 700                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 701                         'ORDER BY' => 'timestamp DESC',
 702                 );
 703
 704                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 705                 return new UserArrayFromResult( $res );
 706         }
 707
 708         /**
 709          * Should the parser cache be used?
 710          *
 711          * @param $parserOptions ParserOptions to check
 712          * @param $oldid int
 713          * @return boolean
 714          */
 715         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
 716                 global $wgEnableParserCache;
 717
 718                 return $wgEnableParserCache
 719                         && $parserOptions->getStubThreshold() == 0
 720                         && $this->exists()
 721                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
 722                         && $this->mTitle->isWikitextPage();
 723         }
 724
 725         /**
 726          * Get a ParserOutput for the given ParserOptions and revision ID.
 727          * The parser cache will be used if possible.
 728          *
 729          * @since 1.19
 730          * @param $parserOptions ParserOptions to use for the parse operation
 731          * @param $oldid Revision ID to get the text from, passing null or 0 will
 732          *               get the current revision (default value)
 733          * @return ParserOutput or false if the revision was not found
 734          */
 735         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
 736                 wfProfileIn( __METHOD__ );
 737
 738                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
 739                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 740                 if ( $parserOptions->getStubThreshold() ) {
 741                         wfIncrStats( 'pcache_miss_stub' );
 742                 }
 743
 744                 if ( $useParserCache ) {
 745                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
 746                         if ( $parserOutput !== false ) {
 747                                 wfProfileOut( __METHOD__ );
 748                                 return $parserOutput;
 749                         }
 750                 }
 751
 752                 if ( $oldid === null || $oldid === 0 ) {
 753                         $oldid = $this->getLatest();
 754                 }
 755
 756                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
 757                 $pool->execute();
 758
 759                 wfProfileOut( __METHOD__ );
 760
 761                 return $pool->getParserOutput();
 762         }
 763
 764         /**
 765          * Perform the actions of a page purging
 766          */
 767         public function doPurge() {
 768                 global $wgUseSquid;
 769
 770                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
 771                         return false;
 772                 }
 773
 774                 // Invalidate the cache
 775                 $this->mTitle->invalidateCache();
 776                 $this->clear();
 777
 778                 if ( $wgUseSquid ) {
 779                         // Commit the transaction before the purge is sent
 780                         $dbw = wfGetDB( DB_MASTER );
 781                         $dbw->commit();
 782
 783                         // Send purge
 784                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 785                         $update->doUpdate();
 786                 }
 787
 788                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 789                         if ( $this->getId() == 0 ) {
 790                                 $text = false;
 791                         } else {
 792                                 $text = $this->getRawText();
 793                         }
 794
 795                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
 796                 }
 797                 return true;
 798         }
 799
 800         /**
 801          * Insert a new empty page record for this article.
 802          * This *must* be followed up by creating a revision
 803          * and running $this->updateRevisionOn( ... );
 804          * or else the record will be left in a funky state.
 805          * Best if all done inside a transaction.
 806          *
 807          * @param $dbw DatabaseBase
 808          * @return int The newly created page_id key, or false if the title already existed
 809          */
 810         public function insertOn( $dbw ) {
 811                 wfProfileIn( __METHOD__ );
 812
 813                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 814                 $dbw->insert( 'page', array(
 815                         'page_id'           => $page_id,
 816                         'page_namespace'    => $this->mTitle->getNamespace(),
 817                         'page_title'        => $this->mTitle->getDBkey(),
 818                         'page_counter'      => 0,
 819                         'page_restrictions' => '',
 820                         'page_is_redirect'  => 0, # Will set this shortly...
 821                         'page_is_new'       => 1,
 822                         'page_random'       => wfRandom(),
 823                         'page_touched'      => $dbw->timestamp(),
 824                         'page_latest'       => 0, # Fill this in shortly...
 825                         'page_len'          => 0, # Fill this in shortly...
 826                 ), __METHOD__, 'IGNORE' );
 827
 828                 $affected = $dbw->affectedRows();
 829
 830                 if ( $affected ) {
 831                         $newid = $dbw->insertId();
 832                         $this->mTitle->resetArticleID( $newid );
 833                 }
 834                 wfProfileOut( __METHOD__ );
 835
 836                 return $affected ? $newid : false;
 837         }
 838
 839         /**
 840          * Update the page record to point to a newly saved revision.
 841          *
 842          * @param $dbw DatabaseBase: object
 843          * @param $revision Revision: For ID number, and text used to set
 844          *                  length and redirect status fields
 845          * @param $lastRevision Integer: if given, will not overwrite the page field
 846          *                      when different from the currently set value.
 847          *                      Giving 0 indicates the new page flag should be set
 848          *                      on.
 849          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
 850          *                           removing rows in redirect table.
 851          * @return bool true on success, false on failure
 852          * @private
 853          */
 854         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
 855                 wfProfileIn( __METHOD__ );
 856
 857                 $text = $revision->getText();
 858                 $len = strlen( $text );
 859                 $rt = Title::newFromRedirectRecurse( $text );
 860
 861                 $conditions = array( 'page_id' => $this->getId() );
 862
 863                 if ( !is_null( $lastRevision ) ) {
 864                         # An extra check against threads stepping on each other
 865                         $conditions['page_latest'] = $lastRevision;
 866                 }
 867
 868                 $now = wfTimestampNow();
 869                 $dbw->update( 'page',
 870                         array( /* SET */
 871                                 'page_latest'      => $revision->getId(),
 872                                 'page_touched'     => $dbw->timestamp( $now ),
 873                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
 874                                 'page_is_redirect' => $rt !== null ? 1 : 0,
 875                                 'page_len'         => $len,
 876                         ),
 877                         $conditions,
 878                         __METHOD__ );
 879
 880                 $result = $dbw->affectedRows() != 0;
 881                 if ( $result ) {
 882                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
 883                         $this->setLastEdit( $revision );
 884                         $this->setCachedLastEditTime( $now );
 885                         $this->mLatest = $revision->getId();
 886                         $this->mIsRedirect = (bool)$rt;
 887                         # Update the LinkCache.
 888                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect, $this->mLatest );
 889                 }
 890
 891                 wfProfileOut( __METHOD__ );
 892                 return $result;
 893         }
 894
 895         /**
 896          * Get the cached timestamp for the last time the page changed.
 897          * This is only used to help handle slave lag by comparing to page_touched.
 898          * @return string MW timestamp
 899          */
 900         protected function getCachedLastEditTime() {
 901                 global $wgMemc;
 902                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 903                 return $wgMemc->get( $key );
 904         }
 905
 906         /**
 907          * Set the cached timestamp for the last time the page changed.
 908          * This is only used to help handle slave lag by comparing to page_touched.
 909          * @param $timestamp string
 910          * @return void
 911          */
 912         public function setCachedLastEditTime( $timestamp ) {
 913                 global $wgMemc;
 914                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 915                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 916         }
 917
 918         /**
 919          * Add row to the redirect table if this is a redirect, remove otherwise.
 920          *
 921          * @param $dbw DatabaseBase
 922          * @param $redirectTitle Title object pointing to the redirect target,
 923          *                       or NULL if this is not a redirect
 924          * @param $lastRevIsRedirect If given, will optimize adding and
 925          *                           removing rows in redirect table.
 926          * @return bool true on success, false on failure
 927          * @private
 928          */
 929         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
 930                 // Always update redirects (target link might have changed)
 931                 // Update/Insert if we don't know if the last revision was a redirect or not
 932                 // Delete if changing from redirect to non-redirect
 933                 $isRedirect = !is_null( $redirectTitle );
 934
 935                 if ( !$isRedirect && !is_null( $lastRevIsRedirect ) && $lastRevIsRedirect === $isRedirect ) {
 936                         return true;
 937                 }
 938
 939                 wfProfileIn( __METHOD__ );
 940                 if ( $isRedirect ) {
 941                         $this->insertRedirectEntry( $redirectTitle );
 942                 } else {
 943                         // This is not a redirect, remove row from redirect table
 944                         $where = array( 'rd_from' => $this->getId() );
 945                         $dbw->delete( 'redirect', $where, __METHOD__ );
 946                 }
 947
 948                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
 949                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
 950                 }
 951                 wfProfileOut( __METHOD__ );
 952
 953                 return ( $dbw->affectedRows() != 0 );
 954         }
 955
 956         /**
 957          * If the given revision is newer than the currently set page_latest,
 958          * update the page record. Otherwise, do nothing.
 959          *
 960          * @param $dbw Database object
 961          * @param $revision Revision object
 962          * @return mixed
 963          */
 964         public function updateIfNewerOn( $dbw, $revision ) {
 965                 wfProfileIn( __METHOD__ );
 966
 967                 $row = $dbw->selectRow(
 968                         array( 'revision', 'page' ),
 969                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
 970                         array(
 971                                 'page_id' => $this->getId(),
 972                                 'page_latest=rev_id' ),
 973                         __METHOD__ );
 974
 975                 if ( $row ) {
 976                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
 977                                 wfProfileOut( __METHOD__ );
 978                                 return false;
 979                         }
 980                         $prev = $row->rev_id;
 981                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
 982                 } else {
 983                         # No or missing previous revision; mark the page as new
 984                         $prev = 0;
 985                         $lastRevIsRedirect = null;
 986                 }
 987
 988                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
 989
 990                 wfProfileOut( __METHOD__ );
 991                 return $ret;
 992         }
 993
 994         /**
 995          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
 996          * @param $text String: new text of the section
 997          * @param $summary String: new section's subject, only if $section is 'new'
 998          * @param $edittime String: revision timestamp or null to use the current revision
 999          * @return string Complete article text, or null if error
1000          */
1001         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1002                 wfProfileIn( __METHOD__ );
1003
1004                 if ( strval( $section ) == '' ) {
1005                         // Whole-page edit; let the whole text through
1006                 } else {
1007                         if ( is_null( $edittime ) ) {
1008                                 $rev = Revision::newFromTitle( $this->mTitle );
1009                         } else {
1010                                 $dbw = wfGetDB( DB_MASTER );
1011                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1012                         }
1013
1014                         if ( !$rev ) {
1015                                 wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1016                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1017                                 wfProfileOut( __METHOD__ );
1018                                 return null;
1019                         }
1020
1021                         $oldtext = $rev->getText();
1022
1023                         if ( $section == 'new' ) {
1024                                 # Inserting a new section
1025                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1026                                 if ( wfRunHooks( 'PlaceNewSection', array( $this, $oldtext, $subject, &$text ) ) ) {
1027                                         $text = strlen( trim( $oldtext ) ) > 0
1028                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1029                                                 : "{$subject}{$text}";
1030                                 }
1031                         } else {
1032                                 # Replacing an existing section; roll out the big guns
1033                                 global $wgParser;
1034
1035                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1036                         }
1037                 }
1038
1039                 wfProfileOut( __METHOD__ );
1040                 return $text;
1041         }
1042
1043         /**
1044          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1045          * @param $flags Int
1046          * @return Int updated $flags
1047          */
1048         function checkFlags( $flags ) {
1049                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1050                         if ( $this->mTitle->getArticleID() ) {
1051                                 $flags |= EDIT_UPDATE;
1052                         } else {
1053                                 $flags |= EDIT_NEW;
1054                         }
1055                 }
1056
1057                 return $flags;
1058         }
1059
1060         /**
1061          * Change an existing article or create a new article. Updates RC and all necessary caches,
1062          * optionally via the deferred update array.
1063          *
1064          * @param $text String: new text
1065          * @param $summary String: edit summary
1066          * @param $flags Integer bitfield:
1067          *      EDIT_NEW
1068          *          Article is known or assumed to be non-existent, create a new one
1069          *      EDIT_UPDATE
1070          *          Article is known or assumed to be pre-existing, update it
1071          *      EDIT_MINOR
1072          *          Mark this edit minor, if the user is allowed to do so
1073          *      EDIT_SUPPRESS_RC
1074          *          Do not log the change in recentchanges
1075          *      EDIT_FORCE_BOT
1076          *          Mark the edit a "bot" edit regardless of user rights
1077          *      EDIT_DEFER_UPDATES
1078          *          Defer some of the updates until the end of index.php
1079          *      EDIT_AUTOSUMMARY
1080          *          Fill in blank summaries with generated text where possible
1081          *
1082          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1083          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1084          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1085          * edit-already-exists error will be returned. These two conditions are also possible with
1086          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1087          *
1088          * @param $baseRevId the revision ID this edit was based off, if any
1089          * @param $user User the user doing the edit
1090          *
1091          * @return Status object. Possible errors:
1092          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1093          *     edit-gone-missing:       In update mode, but the article didn't exist
1094          *     edit-conflict:           In update mode, the article changed unexpectedly
1095          *     edit-no-change:          Warning that the text was the same as before
1096          *     edit-already-exists:     In creation mode, but the article already exists
1097          *
1098          *  Extensions may define additional errors.
1099          *
1100          *  $return->value will contain an associative array with members as follows:
1101          *     new:                     Boolean indicating if the function attempted to create a new article
1102          *     revision:                The revision object for the inserted revision, or null
1103          *
1104          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1105          */
1106         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1107                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1108
1109                 # Low-level sanity check
1110                 if ( $this->mTitle->getText() === '' ) {
1111                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1112                 }
1113
1114                 wfProfileIn( __METHOD__ );
1115
1116                 $user = is_null( $user ) ? $wgUser : $user;
1117                 $status = Status::newGood( array() );
1118
1119                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1120                 $this->loadPageData( 'fromdbmaster' );
1121
1122                 $flags = $this->checkFlags( $flags );
1123
1124                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1125                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1126                 {
1127                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1128
1129                         if ( $status->isOK() ) {
1130                                 $status->fatal( 'edit-hook-aborted' );
1131                         }
1132
1133                         wfProfileOut( __METHOD__ );
1134                         return $status;
1135                 }
1136
1137                 # Silently ignore EDIT_MINOR if not allowed
1138                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1139                 $bot = $flags & EDIT_FORCE_BOT;
1140
1141                 $oldtext = $this->getRawText(); // current revision
1142                 $oldsize = strlen( $oldtext );
1143                 $oldid = $this->getLatest();
1144                 $oldIsRedirect = $this->isRedirect();
1145                 $oldcountable = $this->isCountable();
1146
1147                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1148                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1149                         $summary = self::getAutosummary( $oldtext, $text, $flags );
1150                 }
1151
1152                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
1153                 $text = $editInfo->pst;
1154                 $newsize = strlen( $text );
1155
1156                 $dbw = wfGetDB( DB_MASTER );
1157                 $now = wfTimestampNow();
1158                 $this->mTimestamp = $now;
1159
1160                 if ( $flags & EDIT_UPDATE ) {
1161                         # Update article, but only if changed.
1162                         $status->value['new'] = false;
1163
1164                         # Make sure the revision is either completely inserted or not inserted at all
1165                         if ( !$wgDBtransactions ) {
1166                                 $userAbort = ignore_user_abort( true );
1167                         }
1168
1169                         $revision = new Revision( array(
1170                                 'page'       => $this->getId(),
1171                                 'comment'    => $summary,
1172                                 'minor_edit' => $isminor,
1173                                 'text'       => $text,
1174                                 'parent_id'  => $oldid,
1175                                 'user'       => $user->getId(),
1176                                 'user_text'  => $user->getName(),
1177                                 'timestamp'  => $now
1178                         ) );
1179
1180                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1181
1182                         if ( $changed ) {
1183                                 if ( !$this->mLatest ) {
1184                                         # Article gone missing
1185                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1186                                         $status->fatal( 'edit-gone-missing' );
1187
1188                                         wfProfileOut( __METHOD__ );
1189                                         return $status;
1190                                 }
1191
1192                                 $dbw->begin();
1193                                 $revisionId = $revision->insertOn( $dbw );
1194
1195                                 # Update page
1196                                 #
1197                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1198                                 # during the course of this function. This makes sure that EditPage can detect
1199                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1200                                 # before this function is called. A previous function used a separate query, this
1201                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1202                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1203
1204                                 if ( !$ok ) {
1205                                         /* Belated edit conflict! Run away!! */
1206                                         $status->fatal( 'edit-conflict' );
1207
1208                                         # Delete the invalid revision if the DB is not transactional
1209                                         if ( !$wgDBtransactions ) {
1210                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1211                                         }
1212
1213                                         $revisionId = 0;
1214                                         $dbw->rollback();
1215                                 } else {
1216                                         global $wgUseRCPatrol;
1217                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1218                                         # Update recentchanges
1219                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1220                                                 # Mark as patrolled if the user can do so
1221                                                 $patrolled = $wgUseRCPatrol && !count(
1222                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1223                                                 # Add RC row to the DB
1224                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1225                                                         $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1226                                                         $revisionId, $patrolled
1227                                                 );
1228
1229                                                 # Log auto-patrolled edits
1230                                                 if ( $patrolled ) {
1231                                                         PatrolLog::record( $rc, true );
1232                                                 }
1233                                         }
1234                                         $user->incEditCount();
1235                                         $dbw->commit();
1236                                 }
1237                         }
1238
1239                         if ( !$wgDBtransactions ) {
1240                                 ignore_user_abort( $userAbort );
1241                         }
1242
1243                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1244                         if ( !$status->isOK() ) {
1245                                 wfProfileOut( __METHOD__ );
1246                                 return $status;
1247                         }
1248
1249                         # Update links tables, site stats, etc.
1250                         $this->doEditUpdates( $revision, $user, array( 'changed' => $changed,
1251                                 'oldcountable' => $oldcountable ) );
1252
1253                         if ( !$changed ) {
1254                                 $status->warning( 'edit-no-change' );
1255                                 $revision = null;
1256                                 // Keep the same revision ID, but do some updates on it
1257                                 $revisionId = $this->getLatest();
1258                                 // Update page_touched, this is usually implicit in the page update
1259                                 // Other cache updates are done in onArticleEdit()
1260                                 $this->mTitle->invalidateCache();
1261                         }
1262                 } else {
1263                         # Create new article
1264                         $status->value['new'] = true;
1265
1266                         $dbw->begin();
1267
1268                         # Add the page record; stake our claim on this title!
1269                         # This will return false if the article already exists
1270                         $newid = $this->insertOn( $dbw );
1271
1272                         if ( $newid === false ) {
1273                                 $dbw->rollback();
1274                                 $status->fatal( 'edit-already-exists' );
1275
1276                                 wfProfileOut( __METHOD__ );
1277                                 return $status;
1278                         }
1279
1280                         # Save the revision text...
1281                         $revision = new Revision( array(
1282                                 'page'       => $newid,
1283                                 'comment'    => $summary,
1284                                 'minor_edit' => $isminor,
1285                                 'text'       => $text,
1286                                 'user'       => $user->getId(),
1287                                 'user_text'  => $user->getName(),
1288                                 'timestamp'  => $now
1289                         ) );
1290                         $revisionId = $revision->insertOn( $dbw );
1291
1292                         # Update the page record with revision data
1293                         $this->updateRevisionOn( $dbw, $revision, 0 );
1294
1295                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1296
1297                         # Update recentchanges
1298                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1299                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1300
1301                                 # Mark as patrolled if the user can do so
1302                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1303                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1304                                 # Add RC row to the DB
1305                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1306                                         '', strlen( $text ), $revisionId, $patrolled );
1307
1308                                 # Log auto-patrolled edits
1309                                 if ( $patrolled ) {
1310                                         PatrolLog::record( $rc, true );
1311                                 }
1312                         }
1313                         $user->incEditCount();
1314                         $dbw->commit();
1315
1316                         # Update links, etc.
1317                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1318
1319                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1320                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1321                 }
1322
1323                 # Do updates right now unless deferral was requested
1324                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1325                         DeferredUpdates::doUpdates();
1326                 }
1327
1328                 // Return the new revision (or null) to the caller
1329                 $status->value['revision'] = $revision;
1330
1331                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1332                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1333
1334                 # Promote user to any groups they meet the criteria for
1335                 $user->addAutopromoteOnceGroups( 'onEdit' );
1336
1337                 wfProfileOut( __METHOD__ );
1338                 return $status;
1339         }
1340
1341         /**
1342          * Update the article's restriction field, and leave a log entry.
1343          *
1344          * @todo: seperate the business/permission stuff out from backend code
1345          *
1346          * @param $limit Array: set of restriction keys
1347          * @param $reason String
1348          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1349          * @param $expiry Array: per restriction type expiration
1350          * @param $user User The user updating the restrictions
1351          * @return bool true on success
1352          */
1353         public function updateRestrictions(
1354                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
1355         ) {
1356                 global $wgUser, $wgContLang;
1357                 $user = is_null( $user ) ? $wgUser : $user;
1358
1359                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1360
1361                 $id = $this->mTitle->getArticleID();
1362
1363                 if ( $id <= 0 ) {
1364                         wfDebug( "updateRestrictions failed: article id $id <= 0\n" );
1365                         return false;
1366                 }
1367
1368                 if ( wfReadOnly() ) {
1369                         wfDebug( "updateRestrictions failed: read-only\n" );
1370                         return false;
1371                 }
1372
1373                 if ( count( $this->mTitle->getUserPermissionsErrors( 'protect', $user ) ) ) {
1374                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
1375                         return false;
1376                 }
1377
1378                 if ( !$cascade ) {
1379                         $cascade = false;
1380                 }
1381
1382                 // Take this opportunity to purge out expired restrictions
1383                 Title::purgeExpiredRestrictions();
1384
1385                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1386                 # we expect a single selection, but the schema allows otherwise.
1387                 $current = array();
1388                 $updated = self::flattenRestrictions( $limit );
1389                 $changed = false;
1390
1391                 foreach ( $restrictionTypes as $action ) {
1392                         if ( isset( $expiry[$action] ) ) {
1393                                 # Get current restrictions on $action
1394                                 $aLimits = $this->mTitle->getRestrictions( $action );
1395                                 $current[$action] = implode( '', $aLimits );
1396                                 # Are any actual restrictions being dealt with here?
1397                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
1398
1399                                 # If something changed, we need to log it. Checking $aRChanged
1400                                 # assures that "unprotecting" a page that is not protected does
1401                                 # not log just because the expiry was "changed".
1402                                 if ( $aRChanged &&
1403                                         $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] )
1404                                 {
1405                                         $changed = true;
1406                                 }
1407                         }
1408                 }
1409
1410                 $current = self::flattenRestrictions( $current );
1411
1412                 $changed = ( $changed || $current != $updated );
1413                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
1414                 $protect = ( $updated != '' );
1415
1416                 # If nothing's changed, do nothing
1417                 if ( $changed ) {
1418                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
1419                                 $dbw = wfGetDB( DB_MASTER );
1420
1421                                 # Prepare a null revision to be added to the history
1422                                 $modified = $current != '' && $protect;
1423
1424                                 if ( $protect ) {
1425                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1426                                 } else {
1427                                         $comment_type = 'unprotectedarticle';
1428                                 }
1429
1430                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1431
1432                                 # Only restrictions with the 'protect' right can cascade...
1433                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1434                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1435
1436                                 # The schema allows multiple restrictions
1437                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
1438                                         $cascade = false;
1439                                 }
1440
1441                                 $cascade_description = '';
1442
1443                                 if ( $cascade ) {
1444                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
1445                                 }
1446
1447                                 if ( $reason ) {
1448                                         $comment .= ": $reason";
1449                                 }
1450
1451                                 $editComment = $comment;
1452                                 $encodedExpiry = array();
1453                                 $protect_description = '';
1454                                 foreach ( $limit as $action => $restrictions ) {
1455                                         if ( !isset( $expiry[$action] ) )
1456                                                 $expiry[$action] = $dbw->getInfinity();
1457
1458                                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
1459                                         if ( $restrictions != '' ) {
1460                                                 $protect_description .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
1461                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
1462                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
1463                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
1464                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
1465                                                                 $wgContLang->time( $expiry[$action], false, false ) );
1466                                                 } else {
1467                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
1468                                                 }
1469
1470                                                 $protect_description .= ') ';
1471                                         }
1472                                 }
1473                                 $protect_description = trim( $protect_description );
1474
1475                                 if ( $protect_description && $protect ) {
1476                                         $editComment .= " ($protect_description)";
1477                                 }
1478
1479                                 if ( $cascade ) {
1480                                         $editComment .= "$cascade_description";
1481                                 }
1482
1483                                 # Update restrictions table
1484                                 foreach ( $limit as $action => $restrictions ) {
1485                                         if ( $restrictions != '' ) {
1486                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
1487                                                         array( 'pr_page' => $id,
1488                                                                 'pr_type' => $action,
1489                                                                 'pr_level' => $restrictions,
1490                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
1491                                                                 'pr_expiry' => $encodedExpiry[$action]
1492                                                         ),
1493                                                         __METHOD__
1494                                                 );
1495                                         } else {
1496                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1497                                                         'pr_type' => $action ), __METHOD__ );
1498                                         }
1499                                 }
1500
1501                                 # Insert a null revision
1502                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1503                                 $nullRevId = $nullRevision->insertOn( $dbw );
1504
1505                                 $latest = $this->getLatest();
1506                                 # Update page record
1507                                 $dbw->update( 'page',
1508                                         array( /* SET */
1509                                                 'page_touched' => $dbw->timestamp(),
1510                                                 'page_restrictions' => '',
1511                                                 'page_latest' => $nullRevId
1512                                         ), array( /* WHERE */
1513                                                 'page_id' => $id
1514                                         ), __METHOD__
1515                                 );
1516
1517                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
1518                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
1519
1520                                 # Update the protection log
1521                                 $log = new LogPage( 'protect' );
1522                                 if ( $protect ) {
1523                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
1524                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
1525                                 } else {
1526                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1527                                 }
1528                         } # End hook
1529                 } # End "changed" check
1530
1531                 return true;
1532         }
1533
1534         /**
1535          * Take an array of page restrictions and flatten it to a string
1536          * suitable for insertion into the page_restrictions field.
1537          * @param $limit Array
1538          * @return String
1539          */
1540         protected static function flattenRestrictions( $limit ) {
1541                 if ( !is_array( $limit ) ) {
1542                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
1543                 }
1544
1545                 $bits = array();
1546                 ksort( $limit );
1547
1548                 foreach ( $limit as $action => $restrictions ) {
1549                         if ( $restrictions != '' ) {
1550                                 $bits[] = "$action=$restrictions";
1551                         }
1552                 }
1553
1554                 return implode( ':', $bits );
1555         }
1556
1557         /**
1558          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
1559          */
1560         public function isBigDeletion() {
1561                 global $wgDeleteRevisionsLimit;
1562
1563                 if ( $wgDeleteRevisionsLimit ) {
1564                         $revCount = $this->estimateRevisionCount();
1565
1566                         return $revCount > $wgDeleteRevisionsLimit;
1567                 }
1568
1569                 return false;
1570         }
1571
1572         /**
1573          * @return int approximate revision count
1574          */
1575         public function estimateRevisionCount() {
1576                 $dbr = wfGetDB( DB_SLAVE );
1577                 return $dbr->estimateRowCount( 'revision', '*',
1578                         array( 'rev_page' => $this->getId() ), __METHOD__ );
1579         }
1580
1581         /**
1582          * Get the last N authors
1583          * @param $num Integer: number of revisions to get
1584          * @param $revLatest String: the latest rev_id, selected from the master (optional)
1585          * @return array Array of authors, duplicates not removed
1586          */
1587         public function getLastNAuthors( $num, $revLatest = 0 ) {
1588                 wfProfileIn( __METHOD__ );
1589                 // First try the slave
1590                 // If that doesn't have the latest revision, try the master
1591                 $continue = 2;
1592                 $db = wfGetDB( DB_SLAVE );
1593
1594                 do {
1595                         $res = $db->select( array( 'page', 'revision' ),
1596                                 array( 'rev_id', 'rev_user_text' ),
1597                                 array(
1598                                         'page_namespace' => $this->mTitle->getNamespace(),
1599                                         'page_title' => $this->mTitle->getDBkey(),
1600                                         'rev_page = page_id'
1601                                 ), __METHOD__,
1602                                 array(
1603                                         'ORDER BY' => 'rev_timestamp DESC',
1604                                         'LIMIT' => $num
1605                                 )
1606                         );
1607
1608                         if ( !$res ) {
1609                                 wfProfileOut( __METHOD__ );
1610                                 return array();
1611                         }
1612
1613                         $row = $db->fetchObject( $res );
1614
1615                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1616                                 $db = wfGetDB( DB_MASTER );
1617                                 $continue--;
1618                         } else {
1619                                 $continue = 0;
1620                         }
1621                 } while ( $continue );
1622
1623                 $authors = array( $row->rev_user_text );
1624
1625                 foreach ( $res as $row ) {
1626                         $authors[] = $row->rev_user_text;
1627                 }
1628
1629                 wfProfileOut( __METHOD__ );
1630                 return $authors;
1631         }
1632
1633         /**
1634          * Back-end article deletion
1635          * Deletes the article with database consistency, writes logs, purges caches
1636          *
1637          * @param $reason string delete reason for deletion log
1638          * @param $suppress bitfield
1639          *      Revision::DELETED_TEXT
1640          *      Revision::DELETED_COMMENT
1641          *      Revision::DELETED_USER
1642          *      Revision::DELETED_RESTRICTED
1643          * @param $id int article ID
1644          * @param $commit boolean defaults to true, triggers transaction end
1645          * @param &$errors Array of errors to append to
1646          * @param $user User The relevant user
1647          * @return boolean true if successful
1648          */
1649         public function doDeleteArticle(
1650                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
1651         ) {
1652                 global $wgUser;
1653                 $user = is_null( $user ) ? $wgUser : $user;
1654
1655                 wfDebug( __METHOD__ . "\n" );
1656
1657                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
1658                         return false;
1659                 }
1660                 $dbw = wfGetDB( DB_MASTER );
1661                 $t = $this->mTitle->getDBkey();
1662                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
1663
1664                 if ( $t === '' || $id == 0 ) {
1665                         return false;
1666                 }
1667
1668                 DeferredUpdates::addUpdate(
1669                         new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 )
1670                 );
1671
1672                 // Bitfields to further suppress the content
1673                 if ( $suppress ) {
1674                         $bitfield = 0;
1675                         // This should be 15...
1676                         $bitfield |= Revision::DELETED_TEXT;
1677                         $bitfield |= Revision::DELETED_COMMENT;
1678                         $bitfield |= Revision::DELETED_USER;
1679                         $bitfield |= Revision::DELETED_RESTRICTED;
1680                 } else {
1681                         $bitfield = 'rev_deleted';
1682                 }
1683
1684                 $dbw->begin();
1685                 // For now, shunt the revision data into the archive table.
1686                 // Text is *not* removed from the text table; bulk storage
1687                 // is left intact to avoid breaking block-compression or
1688                 // immutable storage schemes.
1689                 //
1690                 // For backwards compatibility, note that some older archive
1691                 // table entries will have ar_text and ar_flags fields still.
1692                 //
1693                 // In the future, we may keep revisions and mark them with
1694                 // the rev_deleted field, which is reserved for this purpose.
1695                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
1696                         array(
1697                                 'ar_namespace'  => 'page_namespace',
1698                                 'ar_title'      => 'page_title',
1699                                 'ar_comment'    => 'rev_comment',
1700                                 'ar_user'       => 'rev_user',
1701                                 'ar_user_text'  => 'rev_user_text',
1702                                 'ar_timestamp'  => 'rev_timestamp',
1703                                 'ar_minor_edit' => 'rev_minor_edit',
1704                                 'ar_rev_id'     => 'rev_id',
1705                                 'ar_parent_id'  => 'rev_parent_id',
1706                                 'ar_text_id'    => 'rev_text_id',
1707                                 'ar_text'       => '\'\'', // Be explicit to appease
1708                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
1709                                 'ar_len'        => 'rev_len',
1710                                 'ar_page_id'    => 'page_id',
1711                                 'ar_deleted'    => $bitfield,
1712                                 'ar_sha1'       => 'rev_sha1'
1713                         ), array(
1714                                 'page_id' => $id,
1715                                 'page_id = rev_page'
1716                         ), __METHOD__
1717                 );
1718
1719                 # Delete restrictions for it
1720                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
1721
1722                 # Now that it's safely backed up, delete it
1723                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
1724                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
1725
1726                 if ( !$ok ) {
1727                         $dbw->rollback();
1728                         return false;
1729                 }
1730
1731                 # Fix category table counts
1732                 $cats = array();
1733                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
1734
1735                 foreach ( $res as $row ) {
1736                         $cats [] = $row->cl_to;
1737                 }
1738
1739                 $this->updateCategoryCounts( array(), $cats );
1740
1741                 # If using cascading deletes, we can skip some explicit deletes
1742                 if ( !$dbw->cascadingDeletes() ) {
1743                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
1744
1745                         # Delete outgoing links
1746                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ), __METHOD__ );
1747                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ), __METHOD__ );
1748                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ), __METHOD__ );
1749                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ), __METHOD__ );
1750                         $dbw->delete( 'externallinks', array( 'el_from' => $id ), __METHOD__ );
1751                         $dbw->delete( 'langlinks', array( 'll_from' => $id ), __METHOD__ );
1752                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ), __METHOD__ );
1753                         $dbw->delete( 'redirect', array( 'rd_from' => $id ), __METHOD__ );
1754                         $dbw->delete( 'page_props', array( 'pp_page' => $id ), __METHOD__ );
1755                 }
1756
1757                 # If using cleanup triggers, we can skip some manual deletes
1758                 if ( !$dbw->cleanupTriggers() ) {
1759                         # Clean up recentchanges entries...
1760                         $dbw->delete( 'recentchanges',
1761                                 array( 'rc_type != ' . RC_LOG,
1762                                         'rc_namespace' => $this->mTitle->getNamespace(),
1763                                         'rc_title' => $this->mTitle->getDBkey() ),
1764                                 __METHOD__ );
1765                         $dbw->delete( 'recentchanges',
1766                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
1767                                 __METHOD__ );
1768                 }
1769
1770                 # Clear caches
1771                 self::onArticleDelete( $this->mTitle );
1772
1773                 # Clear the cached article id so the interface doesn't act like we exist
1774                 $this->mTitle->resetArticleID( 0 );
1775
1776                 # Log the deletion, if the page was suppressed, log it at Oversight instead
1777                 $logtype = $suppress ? 'suppress' : 'delete';
1778
1779                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
1780                 $logEntry->setPerformer( $user );
1781                 $logEntry->setTarget( $this->mTitle );
1782                 $logEntry->setComment( $reason );
1783                 $logid = $logEntry->insert();
1784                 $logEntry->publish( $logid );
1785
1786                 if ( $commit ) {
1787                         $dbw->commit();
1788                 }
1789
1790                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
1791                 return true;
1792         }
1793
1794         /**
1795          * Roll back the most recent consecutive set of edits to a page
1796          * from the same user; fails if there are no eligible edits to
1797          * roll back to, e.g. user is the sole contributor. This function
1798          * performs permissions checks on $user, then calls commitRollback()
1799          * to do the dirty work
1800          *
1801          * @todo: seperate the business/permission stuff out from backend code
1802          *
1803          * @param $fromP String: Name of the user whose edits to rollback.
1804          * @param $summary String: Custom summary. Set to default summary if empty.
1805          * @param $token String: Rollback token.
1806          * @param $bot Boolean: If true, mark all reverted edits as bot.
1807          *
1808          * @param $resultDetails Array: contains result-specific array of additional values
1809          *    'alreadyrolled' : 'current' (rev)
1810          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
1811          *
1812          * @param $user User The user performing the rollback
1813          * @return array of errors, each error formatted as
1814          *   array(messagekey, param1, param2, ...).
1815          * On success, the array is empty.  This array can also be passed to
1816          * OutputPage::showPermissionsErrorPage().
1817          */
1818         public function doRollback(
1819                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
1820         ) {
1821                 $resultDetails = null;
1822
1823                 # Check permissions
1824                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
1825                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
1826                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
1827
1828                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
1829                         $errors[] = array( 'sessionfailure' );
1830                 }
1831
1832                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
1833                         $errors[] = array( 'actionthrottledtext' );
1834                 }
1835
1836                 # If there were errors, bail out now
1837                 if ( !empty( $errors ) ) {
1838                         return $errors;
1839                 }
1840
1841                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
1842         }
1843
1844         /**
1845          * Backend implementation of doRollback(), please refer there for parameter
1846          * and return value documentation
1847          *
1848          * NOTE: This function does NOT check ANY permissions, it just commits the
1849          * rollback to the DB. Therefore, you should only call this function direct-
1850          * ly if you want to use custom permissions checks. If you don't, use
1851          * doRollback() instead.
1852          * @param $fromP String: Name of the user whose edits to rollback.
1853          * @param $summary String: Custom summary. Set to default summary if empty.
1854          * @param $bot Boolean: If true, mark all reverted edits as bot.
1855          *
1856          * @param $resultDetails Array: contains result-specific array of additional values
1857          * @param $guser User The user performing the rollback
1858          */
1859         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
1860                 global $wgUseRCPatrol, $wgContLang;
1861
1862                 $dbw = wfGetDB( DB_MASTER );
1863
1864                 if ( wfReadOnly() ) {
1865                         return array( array( 'readonlytext' ) );
1866                 }
1867
1868                 # Get the last editor
1869                 $current = Revision::newFromTitle( $this->mTitle );
1870                 if ( is_null( $current ) ) {
1871                         # Something wrong... no page?
1872                         return array( array( 'notanarticle' ) );
1873                 }
1874
1875                 $from = str_replace( '_', ' ', $fromP );
1876                 # User name given should match up with the top revision.
1877                 # If the user was deleted then $from should be empty.
1878                 if ( $from != $current->getUserText() ) {
1879                         $resultDetails = array( 'current' => $current );
1880                         return array( array( 'alreadyrolled',
1881                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
1882                                 htmlspecialchars( $fromP ),
1883                                 htmlspecialchars( $current->getUserText() )
1884                         ) );
1885                 }
1886
1887                 # Get the last edit not by this guy...
1888                 # Note: these may not be public values
1889                 $user = intval( $current->getRawUser() );
1890                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
1891                 $s = $dbw->selectRow( 'revision',
1892                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
1893                         array( 'rev_page' => $current->getPage(),
1894                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
1895                         ), __METHOD__,
1896                         array( 'USE INDEX' => 'page_timestamp',
1897                                 'ORDER BY' => 'rev_timestamp DESC' )
1898                         );
1899                 if ( $s === false ) {
1900                         # No one else ever edited this page
1901                         return array( array( 'cantrollback' ) );
1902                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
1903                         # Only admins can see this text
1904                         return array( array( 'notvisiblerev' ) );
1905                 }
1906
1907                 $set = array();
1908                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
1909                         # Mark all reverted edits as bot
1910                         $set['rc_bot'] = 1;
1911                 }
1912
1913                 if ( $wgUseRCPatrol ) {
1914                         # Mark all reverted edits as patrolled
1915                         $set['rc_patrolled'] = 1;
1916                 }
1917
1918                 if ( count( $set ) ) {
1919                         $dbw->update( 'recentchanges', $set,
1920                                 array( /* WHERE */
1921                                         'rc_cur_id' => $current->getPage(),
1922                                         'rc_user_text' => $current->getUserText(),
1923                                         "rc_timestamp > '{$s->rev_timestamp}'",
1924                                 ), __METHOD__
1925                         );
1926                 }
1927
1928                 # Generate the edit summary if necessary
1929                 $target = Revision::newFromId( $s->rev_id );
1930                 if ( empty( $summary ) ) {
1931                         if ( $from == '' ) { // no public user name
1932                                 $summary = wfMsgForContent( 'revertpage-nouser' );
1933                         } else {
1934                                 $summary = wfMsgForContent( 'revertpage' );
1935                         }
1936                 }
1937
1938                 # Allow the custom summary to use the same args as the default message
1939                 $args = array(
1940                         $target->getUserText(), $from, $s->rev_id,
1941                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
1942                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
1943                 );
1944                 $summary = wfMsgReplaceArgs( $summary, $args );
1945
1946                 # Save
1947                 $flags = EDIT_UPDATE;
1948
1949                 if ( $guser->isAllowed( 'minoredit' ) ) {
1950                         $flags |= EDIT_MINOR;
1951                 }
1952
1953                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
1954                         $flags |= EDIT_FORCE_BOT;
1955                 }
1956
1957                 # Actually store the edit
1958                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
1959                 if ( !empty( $status->value['revision'] ) ) {
1960                         $revId = $status->value['revision']->getId();
1961                 } else {
1962                         $revId = false;
1963                 }
1964
1965                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
1966
1967                 $resultDetails = array(
1968                         'summary' => $summary,
1969                         'current' => $current,
1970                         'target'  => $target,
1971                         'newid'   => $revId
1972                 );
1973
1974                 return array();
1975         }
1976
1977         /**
1978          * Do standard deferred updates after page view
1979          * @param $user User The relevant user
1980          */
1981         public function doViewUpdates( User $user ) {
1982                 global $wgDisableCounters;
1983                 if ( wfReadOnly() ) {
1984                         return;
1985                 }
1986
1987                 # Don't update page view counters on views from bot users (bug 14044)
1988                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->getId() ) {
1989                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1990                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1991                 }
1992
1993                 # Update newtalk / watchlist notification status
1994                 $user->clearNotification( $this->mTitle );
1995         }
1996
1997         /**
1998          * Prepare text which is about to be saved.
1999          * Returns a stdclass with source, pst and output members
2000          */
2001         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
2002                 global $wgParser, $wgContLang, $wgUser;
2003                 $user = is_null( $user ) ? $wgUser : $user;
2004                 // @TODO fixme: check $user->getId() here???
2005                 if ( $this->mPreparedEdit
2006                         && $this->mPreparedEdit->newText == $text
2007                         && $this->mPreparedEdit->revid == $revid
2008                 ) {
2009                         // Already prepared
2010                         return $this->mPreparedEdit;
2011                 }
2012
2013                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2014                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
2015
2016                 $edit = (object)array();
2017                 $edit->revid = $revid;
2018                 $edit->newText = $text;
2019                 $edit->pst = $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2020                 $edit->popts = $this->makeParserOptions( 'canonical' );
2021
2022                 // Bug 32858: For a CSS/JS page, put a blank parser output into the
2023                 // prepared edit, so that links etc. won't be registered in the
2024                 // database. We could have set $edit->output to false or something if
2025                 // we thought of this bug earlier, but now that would break the
2026                 // interface with AbuseFilter etc.
2027                 if ( $this->mTitle->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
2028                         $input = '';
2029                 } else {
2030                         $input = $edit->pst;
2031                 }
2032                 $edit->output = $wgParser->parse( $input, $this->mTitle, $edit->popts, true, true, $revid );
2033                 $edit->oldText = $this->getRawText();
2034
2035                 $this->mPreparedEdit = $edit;
2036
2037                 return $edit;
2038         }
2039
2040         /**
2041          * Do standard deferred updates after page edit.
2042          * Update links tables, site stats, search index and message cache.
2043          * Purges pages that include this page if the text was changed here.
2044          * Every 100th edit, prune the recent changes table.
2045          *
2046          * @private
2047          * @param $revision Revision object
2048          * @param $user User object that did the revision
2049          * @param $options Array of options, following indexes are used:
2050          * - changed: boolean, whether the revision changed the content (default true)
2051          * - created: boolean, whether the revision created the page (default false)
2052          * - oldcountable: boolean or null (default null):
2053          *   - boolean: whether the page was counted as an article before that
2054          *     revision, only used in changed is true and created is false
2055          *   - null: don't change the article count
2056          */
2057         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2058                 global $wgEnableParserCache;
2059
2060                 wfProfileIn( __METHOD__ );
2061
2062                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
2063                 $text = $revision->getText();
2064
2065                 # Parse the text
2066                 # Be careful not to double-PST: $text is usually already PST-ed once
2067                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2068                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2069                         $editInfo = $this->prepareTextForEdit( $text, $revision->getId(), $user );
2070                 } else {
2071                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2072                         $editInfo = $this->mPreparedEdit;
2073                 }
2074
2075                 # Save it to the parser cache
2076                 if ( $wgEnableParserCache ) {
2077                         $parserCache = ParserCache::singleton();
2078                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
2079                 }
2080
2081                 # Update the links tables
2082                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
2083                 $u->doUpdate();
2084
2085                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2086
2087                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2088                         if ( 0 == mt_rand( 0, 99 ) ) {
2089                                 // Flush old entries from the `recentchanges` table; we do this on
2090                                 // random requests so as to avoid an increase in writes for no good reason
2091                                 global $wgRCMaxAge;
2092
2093                                 $dbw = wfGetDB( DB_MASTER );
2094                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2095                                 $dbw->delete(
2096                                         'recentchanges',
2097                                         array( "rc_timestamp < '$cutoff'" ),
2098                                         __METHOD__
2099                                 );
2100                         }
2101                 }
2102
2103                 $id = $this->getId();
2104                 $title = $this->mTitle->getPrefixedDBkey();
2105                 $shortTitle = $this->mTitle->getDBkey();
2106
2107                 if ( 0 == $id ) {
2108                         wfProfileOut( __METHOD__ );
2109                         return;
2110                 }
2111
2112                 if ( !$options['changed'] ) {
2113                         $good = 0;
2114                         $total = 0;
2115                 } elseif ( $options['created'] ) {
2116                         $good = (int)$this->isCountable( $editInfo );
2117                         $total = 1;
2118                 } elseif ( $options['oldcountable'] !== null ) {
2119                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2120                         $total = 0;
2121                 } else {
2122                         $good = 0;
2123                         $total = 0;
2124                 }
2125
2126                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
2127                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $text ) );
2128
2129                 # If this is another user's talk page, update newtalk.
2130                 # Don't do this if $options['changed'] = false (null-edits) nor if
2131                 # it's a minor edit and the user doesn't want notifications for those.
2132                 if ( $options['changed']
2133                         && $this->mTitle->getNamespace() == NS_USER_TALK
2134                         && $shortTitle != $user->getTitleKey()
2135                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2136                 ) {
2137                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2138                                 $other = User::newFromName( $shortTitle, false );
2139                                 if ( !$other ) {
2140                                         wfDebug( __METHOD__ . ": invalid username\n" );
2141                                 } elseif ( User::isIP( $shortTitle ) ) {
2142                                         // An anonymous user
2143                                         $other->setNewtalk( true );
2144                                 } elseif ( $other->isLoggedIn() ) {
2145                                         $other->setNewtalk( true );
2146                                 } else {
2147                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2148                                 }
2149                         }
2150                 }
2151
2152                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2153                         MessageCache::singleton()->replace( $shortTitle, $text );
2154                 }
2155
2156                 if( $options['created'] ) {
2157                         self::onArticleCreate( $this->mTitle );
2158                 } else {
2159                         self::onArticleEdit( $this->mTitle );
2160                 }
2161
2162                 wfProfileOut( __METHOD__ );
2163         }
2164
2165         /**
2166          * Perform article updates on a special page creation.
2167          *
2168          * @param $rev Revision object
2169          *
2170          * @todo This is a shitty interface function. Kill it and replace the
2171          * other shitty functions like doEditUpdates and such so it's not needed
2172          * anymore.
2173          * @deprecated since 1.18, use doEditUpdates()
2174          */
2175         public function createUpdates( $rev ) {
2176                 global $wgUser;
2177                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
2178         }
2179
2180         /**
2181          * This function is called right before saving the wikitext,
2182          * so we can do things like signatures and links-in-context.
2183          *
2184          * @deprecated in 1.19; use Parser::preSaveTransform() instead
2185          * @param $text String article contents
2186          * @param $user User object: user doing the edit
2187          * @param $popts ParserOptions object: parser options, default options for
2188          *               the user loaded if null given
2189          * @return string article contents with altered wikitext markup (signatures
2190          *      converted, {{subst:}}, templates, etc.)
2191          */
2192         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2193                 global $wgParser, $wgUser;
2194
2195                 wfDeprecated( __METHOD__ );
2196
2197                 $user = is_null( $user ) ? $wgUser : $user;
2198
2199                 if ( $popts === null ) {
2200                         $popts = ParserOptions::newFromUser( $user );
2201                 }
2202
2203                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2204         }
2205
2206         /**
2207          * Loads page_touched and returns a value indicating if it should be used
2208          * @return boolean true if not a redirect
2209          */
2210         public function checkTouched() {
2211                 if ( !$this->mDataLoaded ) {
2212                         $this->loadPageData();
2213                 }
2214                 return !$this->mIsRedirect;
2215         }
2216
2217         /**
2218          * Get the page_touched field
2219          * @return string containing GMT timestamp
2220          */
2221         public function getTouched() {
2222                 if ( !$this->mDataLoaded ) {
2223                         $this->loadPageData();
2224                 }
2225                 return $this->mTouched;
2226         }
2227
2228         /**
2229          * Get the page_latest field
2230          * @return integer rev_id of current revision
2231          */
2232         public function getLatest() {
2233                 if ( !$this->mDataLoaded ) {
2234                         $this->loadPageData();
2235                 }
2236                 return (int)$this->mLatest;
2237         }
2238
2239         /**
2240          * Edit an article without doing all that other stuff
2241          * The article must already exist; link tables etc
2242          * are not updated, caches are not flushed.
2243          *
2244          * @param $text String: text submitted
2245          * @param $user User The relevant user
2246          * @param $comment String: comment submitted
2247          * @param $minor Boolean: whereas it's a minor modification
2248          */
2249         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2250                 wfProfileIn( __METHOD__ );
2251
2252                 $dbw = wfGetDB( DB_MASTER );
2253                 $revision = new Revision( array(
2254                         'page'       => $this->getId(),
2255                         'text'       => $text,
2256                         'comment'    => $comment,
2257                         'minor_edit' => $minor ? 1 : 0,
2258                 ) );
2259                 $revision->insertOn( $dbw );
2260                 $this->updateRevisionOn( $dbw, $revision );
2261
2262                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2263
2264                 wfProfileOut( __METHOD__ );
2265         }
2266
2267         /**
2268          * The onArticle*() functions are supposed to be a kind of hooks
2269          * which should be called whenever any of the specified actions
2270          * are done.
2271          *
2272          * This is a good place to put code to clear caches, for instance.
2273          *
2274          * This is called on page move and undelete, as well as edit
2275          *
2276          * @param $title Title object
2277          */
2278         public static function onArticleCreate( $title ) {
2279                 # Update existence markers on article/talk tabs...
2280                 if ( $title->isTalkPage() ) {
2281                         $other = $title->getSubjectPage();
2282                 } else {
2283                         $other = $title->getTalkPage();
2284                 }
2285
2286                 $other->invalidateCache();
2287                 $other->purgeSquid();
2288
2289                 $title->touchLinks();
2290                 $title->purgeSquid();
2291                 $title->deleteTitleProtection();
2292         }
2293
2294         /**
2295          * Clears caches when article is deleted
2296          *
2297          * @param $title Title
2298          */
2299         public static function onArticleDelete( $title ) {
2300                 # Update existence markers on article/talk tabs...
2301                 if ( $title->isTalkPage() ) {
2302                         $other = $title->getSubjectPage();
2303                 } else {
2304                         $other = $title->getTalkPage();
2305                 }
2306
2307                 $other->invalidateCache();
2308                 $other->purgeSquid();
2309
2310                 $title->touchLinks();
2311                 $title->purgeSquid();
2312
2313                 # File cache
2314                 HTMLFileCache::clearFileCache( $title );
2315
2316                 # Messages
2317                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2318                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2319                 }
2320
2321                 # Images
2322                 if ( $title->getNamespace() == NS_FILE ) {
2323                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2324                         $update->doUpdate();
2325                 }
2326
2327                 # User talk pages
2328                 if ( $title->getNamespace() == NS_USER_TALK ) {
2329                         $user = User::newFromName( $title->getText(), false );
2330                         if ( $user ) {
2331                                 $user->setNewtalk( false );
2332                         }
2333                 }
2334
2335                 # Image redirects
2336                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2337         }
2338
2339         /**
2340          * Purge caches on page update etc
2341          *
2342          * @param $title Title object
2343          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2344          */
2345         public static function onArticleEdit( $title ) {
2346                 // Invalidate caches of articles which include this page
2347                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2348
2349
2350                 // Invalidate the caches of all pages which redirect here
2351                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2352
2353                 # Purge squid for this page only
2354                 $title->purgeSquid();
2355
2356                 # Clear file cache for this page only
2357                 HTMLFileCache::clearFileCache( $title );
2358         }
2359
2360         /**#@-*/
2361
2362         /**
2363          * Return a list of templates used by this article.
2364          * Uses the templatelinks table
2365          *
2366          * @return Array of Title objects
2367          */
2368         public function getUsedTemplates() {
2369                 $result = array();
2370                 $id = $this->mTitle->getArticleID();
2371
2372                 if ( $id == 0 ) {
2373                         return array();
2374                 }
2375
2376                 $dbr = wfGetDB( DB_SLAVE );
2377                 $res = $dbr->select( array( 'templatelinks' ),
2378                         array( 'tl_namespace', 'tl_title' ),
2379                         array( 'tl_from' => $id ),
2380                         __METHOD__ );
2381
2382                 if ( $res !== false ) {
2383                         foreach ( $res as $row ) {
2384                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2385                         }
2386                 }
2387
2388                 return $result;
2389         }
2390
2391         /**
2392          * Returns a list of hidden categories this page is a member of.
2393          * Uses the page_props and categorylinks tables.
2394          *
2395          * @return Array of Title objects
2396          */
2397         public function getHiddenCategories() {
2398                 $result = array();
2399                 $id = $this->mTitle->getArticleID();
2400
2401                 if ( $id == 0 ) {
2402                         return array();
2403                 }
2404
2405                 $dbr = wfGetDB( DB_SLAVE );
2406                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2407                         array( 'cl_to' ),
2408                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2409                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2410                         __METHOD__ );
2411
2412                 if ( $res !== false ) {
2413                         foreach ( $res as $row ) {
2414                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2415                         }
2416                 }
2417
2418                 return $result;
2419         }
2420
2421         /**
2422         * Return an applicable autosummary if one exists for the given edit.
2423         * @param $oldtext String: the previous text of the page.
2424         * @param $newtext String: The submitted text of the page.
2425         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2426         * @return string An appropriate autosummary, or an empty string.
2427         */
2428         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2429                 global $wgContLang;
2430
2431                 # Decide what kind of autosummary is needed.
2432
2433                 # Redirect autosummaries
2434                 $ot = Title::newFromRedirect( $oldtext );
2435                 $rt = Title::newFromRedirect( $newtext );
2436
2437                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
2438                         $truncatedtext = $wgContLang->truncate(
2439                                 str_replace( "\n", ' ', $newtext ),
2440                                 max( 0, 250
2441                                         - strlen( wfMsgForContent( 'autoredircomment' ) )
2442                                         - strlen( $rt->getFullText() )
2443                                 ) );
2444                         return wfMsgForContent( 'autoredircomment', $rt->getFullText(), $truncatedtext );
2445                 }
2446
2447                 # New page autosummaries
2448                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
2449                         # If they're making a new article, give its text, truncated, in the summary.
2450
2451                         $truncatedtext = $wgContLang->truncate(
2452                                 str_replace( "\n", ' ', $newtext ),
2453                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
2454
2455                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
2456                 }
2457
2458                 # Blanking autosummaries
2459                 if ( $oldtext != '' && $newtext == '' ) {
2460                         return wfMsgForContent( 'autosumm-blank' );
2461                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
2462                         # Removing more than 90% of the article
2463
2464                         $truncatedtext = $wgContLang->truncate(
2465                                 $newtext,
2466                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
2467
2468                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
2469                 }
2470
2471                 # If we reach this point, there's no applicable autosummary for our case, so our
2472                 # autosummary is empty.
2473                 return '';
2474         }
2475
2476         /**
2477          * Auto-generates a deletion reason
2478          *
2479          * @param &$hasHistory Boolean: whether the page has a history
2480          * @return mixed String containing deletion reason or empty string, or boolean false
2481          *    if no revision occurred
2482          */
2483         public function getAutoDeleteReason( &$hasHistory ) {
2484                 global $wgContLang;
2485
2486                 $dbw = wfGetDB( DB_MASTER );
2487                 // Get the last revision
2488                 $rev = Revision::newFromTitle( $this->getTitle() );
2489
2490                 if ( is_null( $rev ) ) {
2491                         return false;
2492                 }
2493
2494                 // Get the article's contents
2495                 $contents = $rev->getText();
2496                 $blank = false;
2497
2498                 // If the page is blank, use the text from the previous revision,
2499                 // which can only be blank if there's a move/import/protect dummy revision involved
2500                 if ( $contents == '' ) {
2501                         $prev = $rev->getPrevious();
2502
2503                         if ( $prev )    {
2504                                 $contents = $prev->getText();
2505                                 $blank = true;
2506                         }
2507                 }
2508
2509                 // Find out if there was only one contributor
2510                 // Only scan the last 20 revisions
2511                 $res = $dbw->select( 'revision', 'rev_user_text',
2512                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2513                         __METHOD__,
2514                         array( 'LIMIT' => 20 )
2515                 );
2516
2517                 if ( $res === false ) {
2518                         // This page has no revisions, which is very weird
2519                         return false;
2520                 }
2521
2522                 $hasHistory = ( $res->numRows() > 1 );
2523                 $row = $dbw->fetchObject( $res );
2524
2525                 if ( $row ) { // $row is false if the only contributor is hidden
2526                         $onlyAuthor = $row->rev_user_text;
2527                         // Try to find a second contributor
2528                         foreach ( $res as $row ) {
2529                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2530                                         $onlyAuthor = false;
2531                                         break;
2532                                 }
2533                         }
2534                 } else {
2535                         $onlyAuthor = false;
2536                 }
2537
2538                 // Generate the summary with a '$1' placeholder
2539                 if ( $blank ) {
2540                         // The current revision is blank and the one before is also
2541                         // blank. It's just not our lucky day
2542                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2543                 } else {
2544                         if ( $onlyAuthor ) {
2545                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2546                         } else {
2547                                 $reason = wfMsgForContent( 'excontent', '$1' );
2548                         }
2549                 }
2550
2551                 if ( $reason == '-' ) {
2552                         // Allow these UI messages to be blanked out cleanly
2553                         return '';
2554                 }
2555
2556                 // Replace newlines with spaces to prevent uglyness
2557                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2558                 // Calculate the maximum amount of chars to get
2559                 // Max content length = max comment length - length of the comment (excl. $1)
2560                 $maxLength = 255 - ( strlen( $reason ) - 2 );
2561                 $contents = $wgContLang->truncate( $contents, $maxLength );
2562                 // Remove possible unfinished links
2563                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2564                 // Now replace the '$1' placeholder
2565                 $reason = str_replace( '$1', $contents, $reason );
2566
2567                 return $reason;
2568         }
2569
2570         /**
2571         * Get parser options suitable for rendering the primary article wikitext
2572         * @param User|string $user User object or 'canonical'
2573         * @return ParserOptions
2574         */
2575         public function makeParserOptions( $user ) {
2576                 global $wgContLang;
2577                 if ( $user instanceof User ) { // settings per user (even anons)
2578                         $options = ParserOptions::newFromUser( $user );
2579                 } else { // canonical settings
2580                         $options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
2581                 }
2582                 $options->enableLimitReport(); // show inclusion/loop reports
2583                 $options->setTidy( true ); // fix bad HTML
2584                 return $options;
2585         }
2586
2587         /**
2588          * Update all the appropriate counts in the category table, given that
2589          * we've added the categories $added and deleted the categories $deleted.
2590          *
2591          * @param $added array   The names of categories that were added
2592          * @param $deleted array The names of categories that were deleted
2593          */
2594         public function updateCategoryCounts( $added, $deleted ) {
2595                 $ns = $this->mTitle->getNamespace();
2596                 $dbw = wfGetDB( DB_MASTER );
2597
2598                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2599                 # exist, we might legitimately not create it, but it's simpler to just
2600                 # create it and then give it a negative value, since the value is bogus
2601                 # anyway.
2602                 #
2603                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2604                 $insertCats = array_merge( $added, $deleted );
2605                 if ( !$insertCats ) {
2606                         # Okay, nothing to do
2607                         return;
2608                 }
2609
2610                 $insertRows = array();
2611
2612                 foreach ( $insertCats as $cat ) {
2613                         $insertRows[] = array(
2614                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2615                                 'cat_title' => $cat
2616                         );
2617                 }
2618                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2619
2620                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2621                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2622
2623                 if ( $ns == NS_CATEGORY ) {
2624                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2625                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2626                 } elseif ( $ns == NS_FILE ) {
2627                         $addFields[]    = 'cat_files = cat_files + 1';
2628                         $removeFields[] = 'cat_files = cat_files - 1';
2629                 }
2630
2631                 if ( $added ) {
2632                         $dbw->update(
2633                                 'category',
2634                                 $addFields,
2635                                 array( 'cat_title' => $added ),
2636                                 __METHOD__
2637                         );
2638                 }
2639
2640                 if ( $deleted ) {
2641                         $dbw->update(
2642                                 'category',
2643                                 $removeFields,
2644                                 array( 'cat_title' => $deleted ),
2645                                 __METHOD__
2646                         );
2647                 }
2648         }
2649
2650         /**
2651          * Updates cascading protections
2652          *
2653          * @param $parserOutput ParserOutput object for the current version
2654          */
2655         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
2656                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
2657                         return;
2658                 }
2659
2660                 // templatelinks table may have become out of sync,
2661                 // especially if using variable-based transclusions.
2662                 // For paranoia, check if things have changed and if
2663                 // so apply updates to the database. This will ensure
2664                 // that cascaded protections apply as soon as the changes
2665                 // are visible.
2666
2667                 # Get templates from templatelinks
2668                 $id = $this->mTitle->getArticleID();
2669
2670                 $tlTemplates = array();
2671
2672                 $dbr = wfGetDB( DB_SLAVE );
2673                 $res = $dbr->select( array( 'templatelinks' ),
2674                         array( 'tl_namespace', 'tl_title' ),
2675                         array( 'tl_from' => $id ),
2676                         __METHOD__
2677                 );
2678
2679                 foreach ( $res as $row ) {
2680                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
2681                 }
2682
2683                 # Get templates from parser output.
2684                 $poTemplates = array();
2685                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
2686                         foreach ( $templates as $dbk => $id ) {
2687                                 $poTemplates["$ns:$dbk"] = true;
2688                         }
2689                 }
2690
2691                 # Get the diff
2692                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
2693
2694                 if ( count( $templates_diff ) > 0 ) {
2695                         # Whee, link updates time.
2696                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
2697                         $u->doUpdate();
2698                 }
2699         }
2700
2701         /**
2702          * @deprecated since 1.18
2703          */
2704         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2705                 global $wgUser;
2706                 return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
2707         }
2708
2709         /**
2710          * @deprecated since 1.18
2711          */
2712         public function viewUpdates() {
2713                 global $wgUser;
2714                 return $this->doViewUpdates( $wgUser );
2715         }
2716
2717         /**
2718          * @deprecated since 1.18
2719          */
2720         public function useParserCache( $oldid ) {
2721                 global $wgUser;
2722                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
2723         }
2724 }
2725
2726 class PoolWorkArticleView extends PoolCounterWork {
2727
2728         /**
2729          * @var Page
2730          */
2731         private $page;
2732
2733         /**
2734          * @var string
2735          */
2736         private $cacheKey;
2737
2738         /**
2739          * @var integer
2740          */
2741         private $revid;
2742
2743         /**
2744          * @var ParserOptions
2745          */
2746         private $parserOptions;
2747
2748         /**
2749          * @var string|null
2750          */
2751         private $text;
2752
2753         /**
2754          * @var ParserOutput|false
2755          */
2756         private $parserOutput = false;
2757
2758         /**
2759          * @var bool
2760          */
2761         private $isDirty = false;
2762
2763         /**
2764          * @var Status|false
2765          */
2766         private $error = false;
2767
2768         /**
2769          * Constructor
2770          *
2771          * @param $page Page
2772          * @param $revid Integer: ID of the revision being parsed
2773          * @param $useParserCache Boolean: whether to use the parser cache
2774          * @param $parserOptions parserOptions to use for the parse operation
2775          * @param $text String: text to parse or null to load it
2776          */
2777         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $text = null ) {
2778                 $this->page = $page;
2779                 $this->revid = $revid;
2780                 $this->cacheable = $useParserCache;
2781                 $this->parserOptions = $parserOptions;
2782                 $this->text = $text;
2783                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
2784                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
2785         }
2786
2787         /**
2788          * Get the ParserOutput from this object, or false in case of failure
2789          *
2790          * @return ParserOutput
2791          */
2792         public function getParserOutput() {
2793                 return $this->parserOutput;
2794         }
2795
2796         /**
2797          * Get whether the ParserOutput is a dirty one (i.e. expired)
2798          *
2799          * @return bool
2800          */
2801         public function getIsDirty() {
2802                 return $this->isDirty;
2803         }
2804
2805         /**
2806          * Get a Status object in case of error or false otherwise
2807          *
2808          * @return Status|false
2809          */
2810         public function getError() {
2811                 return $this->error;
2812         }
2813
2814         /**
2815          * @return bool
2816          */
2817         function doWork() {
2818                 global $wgParser, $wgUseFileCache;
2819
2820                 $isCurrent = $this->revid === $this->page->getLatest();
2821
2822                 if ( $this->text !== null ) {
2823                         $text = $this->text;
2824                 } elseif ( $isCurrent ) {
2825                         $text = $this->page->getRawText();
2826                 } else {
2827                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
2828                         if ( $rev === null ) {
2829                                 return false;
2830                         }
2831                         $text = $rev->getText();
2832                 }
2833
2834                 $time = - wfTime();
2835                 $this->parserOutput = $wgParser->parse( $text, $this->page->getTitle(),
2836                         $this->parserOptions, true, true, $this->revid );
2837                 $time += wfTime();
2838
2839                 # Timing hack
2840                 if ( $time > 3 ) {
2841                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
2842                                 $this->page->getTitle()->getPrefixedDBkey() ) );
2843                 }
2844
2845                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
2846                         ParserCache::singleton()->save( $this->parserOutput, $this->page, $this->parserOptions );
2847                 }
2848
2849                 // Make sure file cache is not used on uncacheable content.
2850                 // Output that has magic words in it can still use the parser cache
2851                 // (if enabled), though it will generally expire sooner.
2852                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
2853                         $wgUseFileCache = false;
2854                 }
2855
2856                 if ( $isCurrent ) {
2857                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
2858                 }
2859
2860                 return true;
2861         }
2862
2863         /**
2864          * @return bool
2865          */
2866         function getCachedWork() {
2867                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
2868
2869                 if ( $this->parserOutput === false ) {
2870                         wfDebug( __METHOD__ . ": parser cache miss\n" );
2871                         return false;
2872                 } else {
2873                         wfDebug( __METHOD__ . ": parser cache hit\n" );
2874                         return true;
2875                 }
2876         }
2877
2878         /**
2879          * @return bool
2880          */
2881         function fallback() {
2882                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
2883
2884                 if ( $this->parserOutput === false ) {
2885                         wfDebugLog( 'dirty', "dirty missing\n" );
2886                         wfDebug( __METHOD__ . ": no dirty cache\n" );
2887                         return false;
2888                 } else {
2889                         wfDebug( __METHOD__ . ": sending dirty output\n" );
2890                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
2891                         $this->isDirty = true;
2892                         return true;
2893                 }
2894         }
2895
2896         /**
2897          * @param $status Status
2898          */
2899         function error( $status ) {
2900                 $this->error = $status;
2901                 return false;
2902         }
2903 }