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 $mDataLoaded = false;         // !< Boolean
  25         public $mIsRedirect = false;         // !< Boolean
  26         public $mLatest = false;             // !< Integer (false means "not loaded")
  27         public $mPreparedEdit = false;       // !< Array
  28         /**@}}*/
  29
  30         /**
  31          * @var Title
  32          */
  33         protected $mRedirectTarget = null;
  34
  35         /**
  36          * @var Revision
  37          */
  38         protected $mLastRevision = null;
  39
  40         /**
  41          * @var string; timestamp of the current revision or empty string if not loaded
  42          */
  43         protected $mTimestamp = '';
  44
  45         /**
  46          * @var string
  47          */
  48         protected $mTouched = '19700101000000';
  49
  50         /**
  51          * @var int|null
  52          */
  53         protected $mCounter = null;
  54
  55         /**
  56          * Constructor and clear the article
  57          * @param $title Title Reference to a Title object.
  58          */
  59         public function __construct( Title $title ) {
  60                 $this->mTitle = $title;
  61         }
  62
  63         /**
  64          * Create a WikiPage object of the appropriate class for the given title.
  65          *
  66          * @param $title Title
  67          * @return WikiPage object of the appropriate type
  68          */
  69         public static function factory( Title $title ) {
  70                 $ns = $title->getNamespace();
  71
  72                 if ( $ns == NS_MEDIA ) {
  73                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
  74                 } elseif ( $ns < 0 ) {
  75                         throw new MWException( "Invalid or virtual namespace $ns given." );
  76                 }
  77
  78                 switch ( $ns ) {
  79                         case NS_FILE:
  80                                 $page = new WikiFilePage( $title );
  81                                 break;
  82                         case NS_CATEGORY:
  83                                 $page = new WikiCategoryPage( $title );
  84                                 break;
  85                         default:
  86                                 $page = new WikiPage( $title );
  87                 }
  88
  89                 return $page;
  90         }
  91
  92         /**
  93          * Constructor from a page id
  94          *
  95          * @param $id Int article ID to load
  96          *
  97          * @return WikiPage
  98          */
  99         public static function newFromID( $id ) {
 100                 $t = Title::newFromID( $id );
 101                 if ( $t ) {
 102                         return self::factory( $t );
 103                 }
 104                 return null;
 105         }
 106
 107         /**
 108          * Returns overrides for action handlers.
 109          * Classes listed here will be used instead of the default one when
 110          * (and only when) $wgActions[$action] === true. This allows subclasses
 111          * to override the default behavior.
 112          *
 113          * @todo: move this UI stuff somewhere else
 114          *
 115          * @return Array
 116          */
 117         public function getActionOverrides() {
 118                 return array();
 119         }
 120
 121         /**
 122          * If this page is a redirect, get its target
 123          *
 124          * The target will be fetched from the redirect table if possible.
 125          * If this page doesn't have an entry there, call insertRedirect()
 126          * @return Title|mixed object, or null if this page is not a redirect
 127          */
 128         public function getRedirectTarget() {
 129                 if ( !$this->mTitle->isRedirect() ) {
 130                         return null;
 131                 }
 132
 133                 if ( $this->mRedirectTarget !== null ) {
 134                         return $this->mRedirectTarget;
 135                 }
 136
 137                 # Query the redirect table
 138                 $dbr = wfGetDB( DB_SLAVE );
 139                 $row = $dbr->selectRow( 'redirect',
 140                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 141                         array( 'rd_from' => $this->getId() ),
 142                         __METHOD__
 143                 );
 144
 145                 // rd_fragment and rd_interwiki were added later, populate them if empty
 146                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 147                         return $this->mRedirectTarget = Title::makeTitle(
 148                                 $row->rd_namespace, $row->rd_title,
 149                                 $row->rd_fragment, $row->rd_interwiki );
 150                 }
 151
 152                 # This page doesn't have an entry in the redirect table
 153                 return $this->mRedirectTarget = $this->insertRedirect();
 154         }
 155
 156         /**
 157          * Insert an entry for this page into the redirect table.
 158          *
 159          * Don't call this function directly unless you know what you're doing.
 160          * @return Title object or null if not a redirect
 161          */
 162         public function insertRedirect() {
 163                 // recurse through to only get the final target
 164                 $retval = Title::newFromRedirectRecurse( $this->getRawText() );
 165                 if ( !$retval ) {
 166                         return null;
 167                 }
 168                 $this->insertRedirectEntry( $retval );
 169                 return $retval;
 170         }
 171
 172         /**
 173          * Insert or update the redirect table entry for this page to indicate
 174          * it redirects to $rt .
 175          * @param $rt Title redirect target
 176          */
 177         public function insertRedirectEntry( $rt ) {
 178                 $dbw = wfGetDB( DB_MASTER );
 179                 $dbw->replace( 'redirect', array( 'rd_from' ),
 180                         array(
 181                                 'rd_from'      => $this->getId(),
 182                                 'rd_namespace' => $rt->getNamespace(),
 183                                 'rd_title'     => $rt->getDBkey(),
 184                                 'rd_fragment'  => $rt->getFragment(),
 185                                 'rd_interwiki' => $rt->getInterwiki(),
 186                         ),
 187                         __METHOD__
 188                 );
 189         }
 190
 191         /**
 192          * Get the Title object or URL this page redirects to
 193          *
 194          * @return mixed false, Title of in-wiki target, or string with URL
 195          */
 196         public function followRedirect() {
 197                 return $this->getRedirectURL( $this->getRedirectTarget() );
 198         }
 199
 200         /**
 201          * Get the Title object or URL to use for a redirect. We use Title
 202          * objects for same-wiki, non-special redirects and URLs for everything
 203          * else.
 204          * @param $rt Title Redirect target
 205          * @return mixed false, Title object of local target, or string with URL
 206          */
 207         public function getRedirectURL( $rt ) {
 208                 if ( !$rt ) {
 209                         return false;
 210                 }
 211
 212                 if ( $rt->isExternal() ) {
 213                         if ( $rt->isLocal() ) {
 214                                 // Offsite wikis need an HTTP redirect.
 215                                 //
 216                                 // This can be hard to reverse and may produce loops,
 217                                 // so they may be disabled in the site configuration.
 218                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 219                                 return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 220                         } else {
 221                                 // External pages pages without "local" bit set are not valid
 222                                 // redirect targets
 223                                 return false;
 224                         }
 225                 }
 226
 227                 if ( $rt->isSpecialPage() ) {
 228                         // Gotta handle redirects to special pages differently:
 229                         // Fill the HTTP response "Location" header and ignore
 230                         // the rest of the page we're on.
 231                         //
 232                         // Some pages are not valid targets
 233                         if ( $rt->isValidRedirectTarget() ) {
 234                                 return $rt->getFullURL();
 235                         } else {
 236                                 return false;
 237                         }
 238                 }
 239
 240                 return $rt;
 241         }
 242
 243         /**
 244          * Get the title object of the article
 245          * @return Title object of this page
 246          */
 247         public function getTitle() {
 248                 return $this->mTitle;
 249         }
 250
 251         /**
 252          * Clear the object
 253          */
 254         public function clear() {
 255                 $this->mDataLoaded = false;
 256
 257                 $this->mCounter = null;
 258                 $this->mRedirectTarget = null; # Title object if set
 259                 $this->mLastRevision = null; # Latest revision
 260                 $this->mTouched = '19700101000000';
 261                 $this->mTimestamp = '';
 262                 $this->mIsRedirect = false;
 263                 $this->mLatest = false;
 264                 $this->mPreparedEdit = false;
 265         }
 266
 267         /**
 268          * Get the text that needs to be saved in order to undo all revisions
 269          * between $undo and $undoafter. Revisions must belong to the same page,
 270          * must exist and must not be deleted
 271          * @param $undo Revision
 272          * @param $undoafter Revision Must be an earlier revision than $undo
 273          * @return mixed string on success, false on failure
 274          */
 275         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 276                 $cur_text = $this->getRawText();
 277                 if ( $cur_text === false ) {
 278                         return false; // no page
 279                 }
 280                 $undo_text = $undo->getText();
 281                 $undoafter_text = $undoafter->getText();
 282
 283                 if ( $cur_text == $undo_text ) {
 284                         # No use doing a merge if it's just a straight revert.
 285                         return $undoafter_text;
 286                 }
 287
 288                 $undone_text = '';
 289
 290                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
 291                         return false;
 292                 }
 293
 294                 return $undone_text;
 295         }
 296
 297         /**
 298          * Return the list of revision fields that should be selected to create
 299          * a new page.
 300          *
 301          * @return array
 302          */
 303         public static function selectFields() {
 304                 return array(
 305                         'page_id',
 306                         'page_namespace',
 307                         'page_title',
 308                         'page_restrictions',
 309                         'page_counter',
 310                         'page_is_redirect',
 311                         'page_is_new',
 312                         'page_random',
 313                         'page_touched',
 314                         'page_latest',
 315                         'page_len',
 316                 );
 317         }
 318
 319         /**
 320          * Fetch a page record with the given conditions
 321          * @param $dbr DatabaseBase object
 322          * @param $conditions Array
 323          * @return mixed Database result resource, or false on failure
 324          */
 325         protected function pageData( $dbr, $conditions ) {
 326                 $fields = self::selectFields();
 327
 328                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 329
 330                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 331
 332                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 333
 334                 return $row;
 335         }
 336
 337         /**
 338          * Fetch a page record matching the Title object's namespace and title
 339          * using a sanitized title string
 340          *
 341          * @param $dbr DatabaseBase object
 342          * @param $title Title object
 343          * @return mixed Database result resource, or false on failure
 344          */
 345         public function pageDataFromTitle( $dbr, $title ) {
 346                 return $this->pageData( $dbr, array(
 347                         'page_namespace' => $title->getNamespace(),
 348                         'page_title'     => $title->getDBkey() ) );
 349         }
 350
 351         /**
 352          * Fetch a page record matching the requested ID
 353          *
 354          * @param $dbr DatabaseBase
 355          * @param $id Integer
 356          * @return mixed Database result resource, or false on failure
 357          */
 358         public function pageDataFromId( $dbr, $id ) {
 359                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 360         }
 361
 362         /**
 363          * Set the general counter, title etc data loaded from
 364          * some source.
 365          *
 366          * @param $data Object|String One of the following:
 367          *              A DB query result object or...
 368          *              "fromdb" to get from a slave DB or...
 369          *              "fromdbmaster" to get from the master DB
 370          * @return void
 371          */
 372         public function loadPageData( $data = 'fromdb' ) {
 373                 if ( $data === 'fromdbmaster' ) {
 374                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 375                 } elseif ( $data === 'fromdb' ) { // slave
 376                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 377                         # Use a "last rev inserted" timestamp key to dimish the issue of slave lag.
 378                         # Note that DB also stores the master position in the session and checks it.
 379                         $touched = $this->getCachedLastEditTime();
 380                         if ( $touched ) { // key set
 381                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 382                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 383                                 }
 384                         }
 385                 }
 386
 387                 $lc = LinkCache::singleton();
 388
 389                 if ( $data ) {
 390                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 391
 392                         $this->mTitle->loadFromRow( $data );
 393
 394                         # Old-fashioned restrictions
 395                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 396
 397                         $this->mCounter     = intval( $data->page_counter );
 398                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 399                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 400                         $this->mLatest      = intval( $data->page_latest );
 401                 } else {
 402                         $lc->addBadLinkObj( $this->mTitle );
 403
 404                         $this->mTitle->loadFromRow( false );
 405                 }
 406
 407                 $this->mDataLoaded = true;
 408         }
 409
 410         /**
 411          * @return int Page ID
 412          */
 413         public function getId() {
 414                 return $this->mTitle->getArticleID();
 415         }
 416
 417         /**
 418          * @return bool Whether or not the page exists in the database
 419          */
 420         public function exists() {
 421                 return $this->mTitle->exists();
 422         }
 423
 424         /**
 425          * Check if this page is something we're going to be showing
 426          * some sort of sensible content for. If we return false, page
 427          * views (plain action=view) will return an HTTP 404 response,
 428          * so spiders and robots can know they're following a bad link.
 429          *
 430          * @return bool
 431          */
 432         public function hasViewableContent() {
 433                 return $this->mTitle->exists() || $this->mTitle->isAlwaysKnown();
 434         }
 435
 436         /**
 437          * @return int The view count for the page
 438          */
 439         public function getCount() {
 440                 if ( !$this->mDataLoaded ) {
 441                         $this->loadPageData();
 442                 }
 443
 444                 return $this->mCounter;
 445         }
 446
 447         /**
 448          * Determine whether a page would be suitable for being counted as an
 449          * article in the site_stats table based on the title & its content
 450          *
 451          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 452          *        if false, the current database state will be used
 453          * @return Boolean
 454          */
 455         public function isCountable( $editInfo = false ) {
 456                 global $wgArticleCountMethod;
 457
 458                 if ( !$this->mTitle->isContentPage() ) {
 459                         return false;
 460                 }
 461
 462                 $text = $editInfo ? $editInfo->pst : false;
 463
 464                 if ( $this->isRedirect( $text ) ) {
 465                         return false;
 466                 }
 467
 468                 switch ( $wgArticleCountMethod ) {
 469                 case 'any':
 470                         return true;
 471                 case 'comma':
 472                         if ( $text === false ) {
 473                                 $text = $this->getRawText();
 474                         }
 475                         return strpos( $text,  ',' ) !== false;
 476                 case 'link':
 477                         if ( $editInfo ) {
 478                                 // ParserOutput::getLinks() is a 2D array of page links, so
 479                                 // to be really correct we would need to recurse in the array
 480                                 // but the main array should only have items in it if there are
 481                                 // links.
 482                                 return (bool)count( $editInfo->output->getLinks() );
 483                         } else {
 484                                 return (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 485                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 486                         }
 487                 }
 488         }
 489
 490         /**
 491          * Tests if the article text represents a redirect
 492          *
 493          * @param $text mixed string containing article contents, or boolean
 494          * @return bool
 495          */
 496         public function isRedirect( $text = false ) {
 497                 if ( $text === false ) {
 498                         if ( !$this->mDataLoaded ) {
 499                                 $this->loadPageData();
 500                         }
 501
 502                         return (bool)$this->mIsRedirect;
 503                 } else {
 504                         return Title::newFromRedirect( $text ) !== null;
 505                 }
 506         }
 507
 508         /**
 509          * Loads page_touched and returns a value indicating if it should be used
 510          * @return boolean true if not a redirect
 511          */
 512         public function checkTouched() {
 513                 if ( !$this->mDataLoaded ) {
 514                         $this->loadPageData();
 515                 }
 516                 return !$this->mIsRedirect;
 517         }
 518
 519         /**
 520          * Get the page_touched field
 521          * @return string containing GMT timestamp
 522          */
 523         public function getTouched() {
 524                 if ( !$this->mDataLoaded ) {
 525                         $this->loadPageData();
 526                 }
 527                 return $this->mTouched;
 528         }
 529
 530         /**
 531          * Get the page_latest field
 532          * @return integer rev_id of current revision
 533          */
 534         public function getLatest() {
 535                 if ( !$this->mDataLoaded ) {
 536                         $this->loadPageData();
 537                 }
 538                 return (int)$this->mLatest;
 539         }
 540
 541         /**
 542          * Loads everything except the text
 543          * This isn't necessary for all uses, so it's only done if needed.
 544          */
 545         protected function loadLastEdit() {
 546                 if ( $this->mLastRevision !== null ) {
 547                         return; // already loaded
 548                 }
 549
 550                 $latest = $this->getLatest();
 551                 if ( !$latest ) {
 552                         return; // page doesn't exist or is missing page_latest info
 553                 }
 554
 555                 $revision = Revision::newFromPageId( $this->getId(), $latest );
 556                 if ( $revision ) { // sanity
 557                         $this->setLastEdit( $revision );
 558                 }
 559         }
 560
 561         /**
 562          * Set the latest revision
 563          */
 564         protected function setLastEdit( Revision $revision ) {
 565                 $this->mLastRevision = $revision;
 566                 $this->mTimestamp = $revision->getTimestamp();
 567         }
 568
 569         /**
 570          * Get the latest revision
 571          * @return Revision|null
 572          */
 573         public function getRevision() {
 574                 $this->loadLastEdit();
 575                 if ( $this->mLastRevision ) {
 576                         return $this->mLastRevision;
 577                 }
 578                 return null;
 579         }
 580
 581         /**
 582          * Get the text of the current revision. No side-effects...
 583          *
 584          * @param $audience Integer: one of:
 585          *      Revision::FOR_PUBLIC       to be displayed to all users
 586          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 587          *      Revision::RAW              get the text regardless of permissions
 588          * @return String|false The text of the current revision
 589          */
 590         public function getText( $audience = Revision::FOR_PUBLIC ) {
 591                 $this->loadLastEdit();
 592                 if ( $this->mLastRevision ) {
 593                         return $this->mLastRevision->getText( $audience );
 594                 }
 595                 return false;
 596         }
 597
 598         /**
 599          * Get the text of the current revision. No side-effects...
 600          *
 601          * @return String|false The text of the current revision
 602          */
 603         public function getRawText() {
 604                 $this->loadLastEdit();
 605                 if ( $this->mLastRevision ) {
 606                         return $this->mLastRevision->getRawText();
 607                 }
 608                 return false;
 609         }
 610
 611         /**
 612          * @return string MW timestamp of last article revision
 613          */
 614         public function getTimestamp() {
 615                 // Check if the field has been filled by WikiPage::setTimestamp()
 616                 if ( !$this->mTimestamp ) {
 617                         $this->loadLastEdit();
 618                 }
 619                 return wfTimestamp( TS_MW, $this->mTimestamp );
 620         }
 621
 622         /**
 623          * Set the page timestamp (use only to avoid DB queries)
 624          * @param $ts string MW timestamp of last article revision
 625          * @return void
 626          */
 627         public function setTimestamp( $ts ) {
 628                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 629         }
 630
 631         /**
 632          * @param $audience Integer: one of:
 633          *      Revision::FOR_PUBLIC       to be displayed to all users
 634          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 635          *      Revision::RAW              get the text regardless of permissions
 636          * @return int user ID for the user that made the last article revision
 637          */
 638         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 639                 $this->loadLastEdit();
 640                 if ( $this->mLastRevision ) {
 641                         return $this->mLastRevision->getUser( $audience );
 642                 } else {
 643                         return -1;
 644                 }
 645         }
 646
 647         /**
 648          * @param $audience Integer: one of:
 649          *      Revision::FOR_PUBLIC       to be displayed to all users
 650          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 651          *      Revision::RAW              get the text regardless of permissions
 652          * @return string username of the user that made the last article revision
 653          */
 654         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 655                 $this->loadLastEdit();
 656                 if ( $this->mLastRevision ) {
 657                         return $this->mLastRevision->getUserText( $audience );
 658                 } else {
 659                         return '';
 660                 }
 661         }
 662
 663         /**
 664          * @param $audience Integer: one of:
 665          *      Revision::FOR_PUBLIC       to be displayed to all users
 666          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 667          *      Revision::RAW              get the text regardless of permissions
 668          * @return string Comment stored for the last article revision
 669          */
 670         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 671                 $this->loadLastEdit();
 672                 if ( $this->mLastRevision ) {
 673                         return $this->mLastRevision->getComment( $audience );
 674                 } else {
 675                         return '';
 676                 }
 677         }
 678
 679         /**
 680          * Returns true if last revision was marked as "minor edit"
 681          *
 682          * @return boolean Minor edit indicator for the last article revision.
 683          */
 684         public function getMinorEdit() {
 685                 $this->loadLastEdit();
 686                 if ( $this->mLastRevision ) {
 687                         return $this->mLastRevision->isMinor();
 688                 } else {
 689                         return false;
 690                 }
 691         }
 692
 693         /**
 694          * Get the cached timestamp for the last time the page changed.
 695          * This is only used to help handle slave lag by comparing to page_touched.
 696          * @return string MW timestamp
 697          */
 698         protected function getCachedLastEditTime() {
 699                 global $wgMemc;
 700                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 701                 return $wgMemc->get( $key );
 702         }
 703
 704         /**
 705          * Set the cached timestamp for the last time the page changed.
 706          * This is only used to help handle slave lag by comparing to page_touched.
 707          * @param $timestamp string
 708          * @return void
 709          */
 710         public function setCachedLastEditTime( $timestamp ) {
 711                 global $wgMemc;
 712                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 713                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 714         }
 715
 716         /**
 717          * Get a list of users who have edited this article, not including the user who made
 718          * the most recent revision, which you can get from $article->getUser() if you want it
 719          * @return UserArrayFromResult
 720          */
 721         public function getContributors() {
 722                 # @todo FIXME: This is expensive; cache this info somewhere.
 723
 724                 $dbr = wfGetDB( DB_SLAVE );
 725
 726                 if ( $dbr->implicitGroupby() ) {
 727                         $realNameField = 'user_real_name';
 728                 } else {
 729                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 730                 }
 731
 732                 $tables = array( 'revision', 'user' );
 733
 734                 $fields = array(
 735                         'rev_user as user_id',
 736                         'rev_user_text AS user_name',
 737                         $realNameField,
 738                         'MAX(rev_timestamp) AS timestamp',
 739                 );
 740
 741                 $conds = array( 'rev_page' => $this->getId() );
 742
 743                 // The user who made the top revision gets credited as "this page was last edited by
 744                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 745                 $user = $this->getUser();
 746                 if ( $user ) {
 747                         $conds[] = "rev_user != $user";
 748                 } else {
 749                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 750                 }
 751
 752                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 753
 754                 $jconds = array(
 755                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 756                 );
 757
 758                 $options = array(
 759                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 760                         'ORDER BY' => 'timestamp DESC',
 761                 );
 762
 763                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 764                 return new UserArrayFromResult( $res );
 765         }
 766
 767         /**
 768          * Get the last N authors
 769          * @param $num Integer: number of revisions to get
 770          * @param $revLatest String: the latest rev_id, selected from the master (optional)
 771          * @return array Array of authors, duplicates not removed
 772          */
 773         public function getLastNAuthors( $num, $revLatest = 0 ) {
 774                 wfProfileIn( __METHOD__ );
 775                 // First try the slave
 776                 // If that doesn't have the latest revision, try the master
 777                 $continue = 2;
 778                 $db = wfGetDB( DB_SLAVE );
 779
 780                 do {
 781                         $res = $db->select( array( 'page', 'revision' ),
 782                                 array( 'rev_id', 'rev_user_text' ),
 783                                 array(
 784                                         'page_namespace' => $this->mTitle->getNamespace(),
 785                                         'page_title' => $this->mTitle->getDBkey(),
 786                                         'rev_page = page_id'
 787                                 ), __METHOD__,
 788                                 array(
 789                                         'ORDER BY' => 'rev_timestamp DESC',
 790                                         'LIMIT' => $num
 791                                 )
 792                         );
 793
 794                         if ( !$res ) {
 795                                 wfProfileOut( __METHOD__ );
 796                                 return array();
 797                         }
 798
 799                         $row = $db->fetchObject( $res );
 800
 801                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
 802                                 $db = wfGetDB( DB_MASTER );
 803                                 $continue--;
 804                         } else {
 805                                 $continue = 0;
 806                         }
 807                 } while ( $continue );
 808
 809                 $authors = array( $row->rev_user_text );
 810
 811                 foreach ( $res as $row ) {
 812                         $authors[] = $row->rev_user_text;
 813                 }
 814
 815                 wfProfileOut( __METHOD__ );
 816                 return $authors;
 817         }
 818
 819         /**
 820          * Should the parser cache be used?
 821          *
 822          * @param $parserOptions ParserOptions to check
 823          * @param $oldid int
 824          * @return boolean
 825          */
 826         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
 827                 global $wgEnableParserCache;
 828
 829                 return $wgEnableParserCache
 830                         && $parserOptions->getStubThreshold() == 0
 831                         && $this->mTitle->exists()
 832                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
 833                         && $this->mTitle->isWikitextPage();
 834         }
 835
 836         /**
 837          * Get a ParserOutput for the given ParserOptions and revision ID.
 838          * The parser cache will be used if possible.
 839          *
 840          * @since 1.19
 841          * @param $parserOptions ParserOptions to use for the parse operation
 842          * @param $oldid Revision ID to get the text from, passing null or 0 will
 843          *               get the current revision (default value)
 844          * @return ParserOutput or false if the revision was not found
 845          */
 846         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
 847                 wfProfileIn( __METHOD__ );
 848
 849                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
 850                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 851                 if ( $parserOptions->getStubThreshold() ) {
 852                         wfIncrStats( 'pcache_miss_stub' );
 853                 }
 854
 855                 if ( $useParserCache ) {
 856                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
 857                         if ( $parserOutput !== false ) {
 858                                 wfProfileOut( __METHOD__ );
 859                                 return $parserOutput;
 860                         }
 861                 }
 862
 863                 if ( $oldid === null || $oldid === 0 ) {
 864                         $oldid = $this->getLatest();
 865                 }
 866
 867                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
 868                 $pool->execute();
 869
 870                 wfProfileOut( __METHOD__ );
 871
 872                 return $pool->getParserOutput();
 873         }
 874
 875         /**
 876          * Do standard deferred updates after page view
 877          * @param $user User The relevant user
 878          */
 879         public function doViewUpdates( User $user ) {
 880                 global $wgDisableCounters;
 881                 if ( wfReadOnly() ) {
 882                         return;
 883                 }
 884
 885                 # Don't update page view counters on views from bot users (bug 14044)
 886                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->mTitle->exists() ) {
 887                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
 888                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
 889                 }
 890
 891                 # Update newtalk / watchlist notification status
 892                 $user->clearNotification( $this->mTitle );
 893         }
 894
 895         /**
 896          * Perform the actions of a page purging
 897          */
 898         public function doPurge() {
 899                 global $wgUseSquid;
 900
 901                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
 902                         return false;
 903                 }
 904
 905                 // Invalidate the cache
 906                 $this->mTitle->invalidateCache();
 907                 $this->clear();
 908
 909                 if ( $wgUseSquid ) {
 910                         // Commit the transaction before the purge is sent
 911                         $dbw = wfGetDB( DB_MASTER );
 912                         $dbw->commit();
 913
 914                         // Send purge
 915                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 916                         $update->doUpdate();
 917                 }
 918
 919                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 920                         if ( $this->mTitle->exists() ) {
 921                                 $text = $this->getRawText();
 922                         } else {
 923                                 $text = false;
 924                         }
 925
 926                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
 927                 }
 928                 return true;
 929         }
 930
 931         /**
 932          * Insert a new empty page record for this article.
 933          * This *must* be followed up by creating a revision
 934          * and running $this->updateRevisionOn( ... );
 935          * or else the record will be left in a funky state.
 936          * Best if all done inside a transaction.
 937          *
 938          * @param $dbw DatabaseBase
 939          * @return int The newly created page_id key, or false if the title already existed
 940          */
 941         public function insertOn( $dbw ) {
 942                 wfProfileIn( __METHOD__ );
 943
 944                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 945                 $dbw->insert( 'page', array(
 946                         'page_id'           => $page_id,
 947                         'page_namespace'    => $this->mTitle->getNamespace(),
 948                         'page_title'        => $this->mTitle->getDBkey(),
 949                         'page_counter'      => 0,
 950                         'page_restrictions' => '',
 951                         'page_is_redirect'  => 0, # Will set this shortly...
 952                         'page_is_new'       => 1,
 953                         'page_random'       => wfRandom(),
 954                         'page_touched'      => $dbw->timestamp(),
 955                         'page_latest'       => 0, # Fill this in shortly...
 956                         'page_len'          => 0, # Fill this in shortly...
 957                 ), __METHOD__, 'IGNORE' );
 958
 959                 $affected = $dbw->affectedRows();
 960
 961                 if ( $affected ) {
 962                         $newid = $dbw->insertId();
 963                         $this->mTitle->resetArticleID( $newid );
 964                 }
 965                 wfProfileOut( __METHOD__ );
 966
 967                 return $affected ? $newid : false;
 968         }
 969
 970         /**
 971          * Update the page record to point to a newly saved revision.
 972          *
 973          * @param $dbw DatabaseBase: object
 974          * @param $revision Revision: For ID number, and text used to set
 975          *                  length and redirect status fields
 976          * @param $lastRevision Integer: if given, will not overwrite the page field
 977          *                      when different from the currently set value.
 978          *                      Giving 0 indicates the new page flag should be set
 979          *                      on.
 980          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
 981          *                           removing rows in redirect table.
 982          * @return bool true on success, false on failure
 983          * @private
 984          */
 985         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
 986                 wfProfileIn( __METHOD__ );
 987
 988                 $text = $revision->getText();
 989                 $len = strlen( $text );
 990                 $rt = Title::newFromRedirectRecurse( $text );
 991
 992                 $conditions = array( 'page_id' => $this->getId() );
 993
 994                 if ( !is_null( $lastRevision ) ) {
 995                         # An extra check against threads stepping on each other
 996                         $conditions['page_latest'] = $lastRevision;
 997                 }
 998
 999                 $now = wfTimestampNow();
1000                 $dbw->update( 'page',
1001                         array( /* SET */
1002                                 'page_latest'      => $revision->getId(),
1003                                 'page_touched'     => $dbw->timestamp( $now ),
1004                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1005                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1006                                 'page_len'         => $len,
1007                         ),
1008                         $conditions,
1009                         __METHOD__ );
1010
1011                 $result = $dbw->affectedRows() != 0;
1012                 if ( $result ) {
1013                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1014                         $this->setLastEdit( $revision );
1015                         $this->setCachedLastEditTime( $now );
1016                         $this->mLatest = $revision->getId();
1017                         $this->mIsRedirect = (bool)$rt;
1018                         # Update the LinkCache.
1019                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect, $this->mLatest );
1020                 }
1021
1022                 wfProfileOut( __METHOD__ );
1023                 return $result;
1024         }
1025
1026         /**
1027          * Add row to the redirect table if this is a redirect, remove otherwise.
1028          *
1029          * @param $dbw DatabaseBase
1030          * @param $redirectTitle Title object pointing to the redirect target,
1031          *                       or NULL if this is not a redirect
1032          * @param $lastRevIsRedirect If given, will optimize adding and
1033          *                           removing rows in redirect table.
1034          * @return bool true on success, false on failure
1035          * @private
1036          */
1037         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1038                 // Always update redirects (target link might have changed)
1039                 // Update/Insert if we don't know if the last revision was a redirect or not
1040                 // Delete if changing from redirect to non-redirect
1041                 $isRedirect = !is_null( $redirectTitle );
1042
1043                 if ( !$isRedirect && !is_null( $lastRevIsRedirect ) && $lastRevIsRedirect === $isRedirect ) {
1044                         return true;
1045                 }
1046
1047                 wfProfileIn( __METHOD__ );
1048                 if ( $isRedirect ) {
1049                         $this->insertRedirectEntry( $redirectTitle );
1050                 } else {
1051                         // This is not a redirect, remove row from redirect table
1052                         $where = array( 'rd_from' => $this->getId() );
1053                         $dbw->delete( 'redirect', $where, __METHOD__ );
1054                 }
1055
1056                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1057                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1058                 }
1059                 wfProfileOut( __METHOD__ );
1060
1061                 return ( $dbw->affectedRows() != 0 );
1062         }
1063
1064         /**
1065          * If the given revision is newer than the currently set page_latest,
1066          * update the page record. Otherwise, do nothing.
1067          *
1068          * @param $dbw Database object
1069          * @param $revision Revision object
1070          * @return mixed
1071          */
1072         public function updateIfNewerOn( $dbw, $revision ) {
1073                 wfProfileIn( __METHOD__ );
1074
1075                 $row = $dbw->selectRow(
1076                         array( 'revision', 'page' ),
1077                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1078                         array(
1079                                 'page_id' => $this->getId(),
1080                                 'page_latest=rev_id' ),
1081                         __METHOD__ );
1082
1083                 if ( $row ) {
1084                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1085                                 wfProfileOut( __METHOD__ );
1086                                 return false;
1087                         }
1088                         $prev = $row->rev_id;
1089                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1090                 } else {
1091                         # No or missing previous revision; mark the page as new
1092                         $prev = 0;
1093                         $lastRevIsRedirect = null;
1094                 }
1095
1096                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1097
1098                 wfProfileOut( __METHOD__ );
1099                 return $ret;
1100         }
1101
1102         /**
1103          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1104          * @param $text String: new text of the section
1105          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1106          * @param $edittime String: revision timestamp or null to use the current revision
1107          * @return string Complete article text, or null if error
1108          */
1109         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) {
1110                 wfProfileIn( __METHOD__ );
1111
1112                 if ( strval( $section ) == '' ) {
1113                         // Whole-page edit; let the whole text through
1114                 } else {
1115                         // Bug 30711: always use current version when adding a new section
1116                         if ( is_null( $edittime ) || $section == 'new' ) {
1117                                 $oldtext = $this->getRawText();
1118                                 if ( $oldtext === false ) {
1119                                         wfDebug( __METHOD__ . ": no page text\n" );
1120                                         return null;
1121                                 }
1122                         } else {
1123                                 $dbw = wfGetDB( DB_MASTER );
1124                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1125
1126                                 if ( !$rev ) {
1127                                         wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1128                                                 $this->getId() . "; section: $section; edittime: $edittime)\n" );
1129                                         wfProfileOut( __METHOD__ );
1130                                         return null;
1131                                 }
1132
1133                                 $oldtext = $rev->getText();
1134                         }
1135
1136                         if ( $section == 'new' ) {
1137                                 # Inserting a new section
1138                                 $subject = $sectionTitle ? wfMsgForContent( 'newsectionheaderdefaultlevel', $sectionTitle ) . "\n\n" : '';
1139                                 if ( wfRunHooks( 'PlaceNewSection', array( $this, $oldtext, $subject, &$text ) ) ) {
1140                                         $text = strlen( trim( $oldtext ) ) > 0
1141                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1142                                                 : "{$subject}{$text}";
1143                                 }
1144                         } else {
1145                                 # Replacing an existing section; roll out the big guns
1146                                 global $wgParser;
1147
1148                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1149                         }
1150                 }
1151
1152                 wfProfileOut( __METHOD__ );
1153                 return $text;
1154         }
1155
1156         /**
1157          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1158          * @param $flags Int
1159          * @return Int updated $flags
1160          */
1161         function checkFlags( $flags ) {
1162                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1163                         if ( $this->mTitle->getArticleID() ) {
1164                                 $flags |= EDIT_UPDATE;
1165                         } else {
1166                                 $flags |= EDIT_NEW;
1167                         }
1168                 }
1169
1170                 return $flags;
1171         }
1172
1173         /**
1174          * Change an existing article or create a new article. Updates RC and all necessary caches,
1175          * optionally via the deferred update array.
1176          *
1177          * @param $text String: new text
1178          * @param $summary String: edit summary
1179          * @param $flags Integer bitfield:
1180          *      EDIT_NEW
1181          *          Article is known or assumed to be non-existent, create a new one
1182          *      EDIT_UPDATE
1183          *          Article is known or assumed to be pre-existing, update it
1184          *      EDIT_MINOR
1185          *          Mark this edit minor, if the user is allowed to do so
1186          *      EDIT_SUPPRESS_RC
1187          *          Do not log the change in recentchanges
1188          *      EDIT_FORCE_BOT
1189          *          Mark the edit a "bot" edit regardless of user rights
1190          *      EDIT_DEFER_UPDATES
1191          *          Defer some of the updates until the end of index.php
1192          *      EDIT_AUTOSUMMARY
1193          *          Fill in blank summaries with generated text where possible
1194          *
1195          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1196          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1197          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1198          * edit-already-exists error will be returned. These two conditions are also possible with
1199          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1200          *
1201          * @param $baseRevId the revision ID this edit was based off, if any
1202          * @param $user User the user doing the edit
1203          *
1204          * @return Status object. Possible errors:
1205          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1206          *     edit-gone-missing:       In update mode, but the article didn't exist
1207          *     edit-conflict:           In update mode, the article changed unexpectedly
1208          *     edit-no-change:          Warning that the text was the same as before
1209          *     edit-already-exists:     In creation mode, but the article already exists
1210          *
1211          *  Extensions may define additional errors.
1212          *
1213          *  $return->value will contain an associative array with members as follows:
1214          *     new:                     Boolean indicating if the function attempted to create a new article
1215          *     revision:                The revision object for the inserted revision, or null
1216          *
1217          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1218          */
1219         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1220                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1221
1222                 # Low-level sanity check
1223                 if ( $this->mTitle->getText() === '' ) {
1224                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1225                 }
1226
1227                 wfProfileIn( __METHOD__ );
1228
1229                 $user = is_null( $user ) ? $wgUser : $user;
1230                 $status = Status::newGood( array() );
1231
1232                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1233                 $this->loadPageData( 'fromdbmaster' );
1234
1235                 $flags = $this->checkFlags( $flags );
1236
1237                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1238                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1239                 {
1240                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1241
1242                         if ( $status->isOK() ) {
1243                                 $status->fatal( 'edit-hook-aborted' );
1244                         }
1245
1246                         wfProfileOut( __METHOD__ );
1247                         return $status;
1248                 }
1249
1250                 # Silently ignore EDIT_MINOR if not allowed
1251                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1252                 $bot = $flags & EDIT_FORCE_BOT;
1253
1254                 $oldtext = $this->getRawText(); // current revision
1255                 $oldsize = strlen( $oldtext );
1256                 $oldid = $this->getLatest();
1257                 $oldIsRedirect = $this->isRedirect();
1258                 $oldcountable = $this->isCountable();
1259
1260                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1261                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1262                         $summary = self::getAutosummary( $oldtext, $text, $flags );
1263                 }
1264
1265                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
1266                 $text = $editInfo->pst;
1267                 $newsize = strlen( $text );
1268
1269                 $dbw = wfGetDB( DB_MASTER );
1270                 $now = wfTimestampNow();
1271                 $this->mTimestamp = $now;
1272
1273                 if ( $flags & EDIT_UPDATE ) {
1274                         # Update article, but only if changed.
1275                         $status->value['new'] = false;
1276
1277                         # Make sure the revision is either completely inserted or not inserted at all
1278                         if ( !$wgDBtransactions ) {
1279                                 $userAbort = ignore_user_abort( true );
1280                         }
1281
1282                         $revision = new Revision( array(
1283                                 'page'       => $this->getId(),
1284                                 'comment'    => $summary,
1285                                 'minor_edit' => $isminor,
1286                                 'text'       => $text,
1287                                 'parent_id'  => $oldid,
1288                                 'user'       => $user->getId(),
1289                                 'user_text'  => $user->getName(),
1290                                 'timestamp'  => $now
1291                         ) );
1292
1293                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1294
1295                         if ( $changed ) {
1296                                 if ( !$this->mLatest ) {
1297                                         # Article gone missing
1298                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1299                                         $status->fatal( 'edit-gone-missing' );
1300
1301                                         wfProfileOut( __METHOD__ );
1302                                         return $status;
1303                                 }
1304
1305                                 $dbw->begin();
1306                                 $revisionId = $revision->insertOn( $dbw );
1307
1308                                 # Update page
1309                                 #
1310                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1311                                 # during the course of this function. This makes sure that EditPage can detect
1312                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1313                                 # before this function is called. A previous function used a separate query, this
1314                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1315                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1316
1317                                 if ( !$ok ) {
1318                                         /* Belated edit conflict! Run away!! */
1319                                         $status->fatal( 'edit-conflict' );
1320
1321                                         # Delete the invalid revision if the DB is not transactional
1322                                         if ( !$wgDBtransactions ) {
1323                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1324                                         }
1325
1326                                         $revisionId = 0;
1327                                         $dbw->rollback();
1328                                 } else {
1329                                         global $wgUseRCPatrol;
1330                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1331                                         # Update recentchanges
1332                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1333                                                 # Mark as patrolled if the user can do so
1334                                                 $patrolled = $wgUseRCPatrol && !count(
1335                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1336                                                 # Add RC row to the DB
1337                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1338                                                         $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1339                                                         $revisionId, $patrolled
1340                                                 );
1341
1342                                                 # Log auto-patrolled edits
1343                                                 if ( $patrolled ) {
1344                                                         PatrolLog::record( $rc, true );
1345                                                 }
1346                                         }
1347                                         $user->incEditCount();
1348                                         $dbw->commit();
1349                                 }
1350                         }
1351
1352                         if ( !$wgDBtransactions ) {
1353                                 ignore_user_abort( $userAbort );
1354                         }
1355
1356                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1357                         if ( !$status->isOK() ) {
1358                                 wfProfileOut( __METHOD__ );
1359                                 return $status;
1360                         }
1361
1362                         # Update links tables, site stats, etc.
1363                         $this->doEditUpdates( $revision, $user, array( 'changed' => $changed,
1364                                 'oldcountable' => $oldcountable ) );
1365
1366                         if ( !$changed ) {
1367                                 $status->warning( 'edit-no-change' );
1368                                 $revision = null;
1369                                 // Keep the same revision ID, but do some updates on it
1370                                 $revisionId = $this->getLatest();
1371                                 // Update page_touched, this is usually implicit in the page update
1372                                 // Other cache updates are done in onArticleEdit()
1373                                 $this->mTitle->invalidateCache();
1374                         }
1375                 } else {
1376                         # Create new article
1377                         $status->value['new'] = true;
1378
1379                         $dbw->begin();
1380
1381                         # Add the page record; stake our claim on this title!
1382                         # This will return false if the article already exists
1383                         $newid = $this->insertOn( $dbw );
1384
1385                         if ( $newid === false ) {
1386                                 $dbw->rollback();
1387                                 $status->fatal( 'edit-already-exists' );
1388
1389                                 wfProfileOut( __METHOD__ );
1390                                 return $status;
1391                         }
1392
1393                         # Save the revision text...
1394                         $revision = new Revision( array(
1395                                 'page'       => $newid,
1396                                 'comment'    => $summary,
1397                                 'minor_edit' => $isminor,
1398                                 'text'       => $text,
1399                                 'user'       => $user->getId(),
1400                                 'user_text'  => $user->getName(),
1401                                 'timestamp'  => $now
1402                         ) );
1403                         $revisionId = $revision->insertOn( $dbw );
1404
1405                         # Update the page record with revision data
1406                         $this->updateRevisionOn( $dbw, $revision, 0 );
1407
1408                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1409
1410                         # Update recentchanges
1411                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1412                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1413
1414                                 # Mark as patrolled if the user can do so
1415                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1416                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1417                                 # Add RC row to the DB
1418                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1419                                         '', strlen( $text ), $revisionId, $patrolled );
1420
1421                                 # Log auto-patrolled edits
1422                                 if ( $patrolled ) {
1423                                         PatrolLog::record( $rc, true );
1424                                 }
1425                         }
1426                         $user->incEditCount();
1427                         $dbw->commit();
1428
1429                         # Update links, etc.
1430                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1431
1432                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1433                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1434                 }
1435
1436                 # Do updates right now unless deferral was requested
1437                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1438                         DeferredUpdates::doUpdates();
1439                 }
1440
1441                 // Return the new revision (or null) to the caller
1442                 $status->value['revision'] = $revision;
1443
1444                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1445                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1446
1447                 # Promote user to any groups they meet the criteria for
1448                 $user->addAutopromoteOnceGroups( 'onEdit' );
1449
1450                 wfProfileOut( __METHOD__ );
1451                 return $status;
1452         }
1453
1454         /**
1455          * Get parser options suitable for rendering the primary article wikitext
1456          * @param User|string $user User object or 'canonical'
1457          * @return ParserOptions
1458          */
1459         public function makeParserOptions( $user ) {
1460                 global $wgContLang;
1461                 if ( $user instanceof User ) { // settings per user (even anons)
1462                         $options = ParserOptions::newFromUser( $user );
1463                 } else { // canonical settings
1464                         $options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
1465                 }
1466                 $options->enableLimitReport(); // show inclusion/loop reports
1467                 $options->setTidy( true ); // fix bad HTML
1468                 return $options;
1469         }
1470
1471         /**
1472          * Prepare text which is about to be saved.
1473          * Returns a stdclass with source, pst and output members
1474          */
1475         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1476                 global $wgParser, $wgContLang, $wgUser;
1477                 $user = is_null( $user ) ? $wgUser : $user;
1478                 // @TODO fixme: check $user->getId() here???
1479                 if ( $this->mPreparedEdit
1480                         && $this->mPreparedEdit->newText == $text
1481                         && $this->mPreparedEdit->revid == $revid
1482                 ) {
1483                         // Already prepared
1484                         return $this->mPreparedEdit;
1485                 }
1486
1487                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
1488                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1489
1490                 $edit = (object)array();
1491                 $edit->revid = $revid;
1492                 $edit->newText = $text;
1493                 $edit->pst = $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
1494                 $edit->popts = $this->makeParserOptions( 'canonical' );
1495                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
1496                 $edit->oldText = $this->getRawText();
1497
1498                 $this->mPreparedEdit = $edit;
1499
1500                 return $edit;
1501         }
1502
1503         /**
1504          * Do standard deferred updates after page edit.
1505          * Update links tables, site stats, search index and message cache.
1506          * Purges pages that include this page if the text was changed here.
1507          * Every 100th edit, prune the recent changes table.
1508          *
1509          * @private
1510          * @param $revision Revision object
1511          * @param $user User object that did the revision
1512          * @param $options Array of options, following indexes are used:
1513          * - changed: boolean, whether the revision changed the content (default true)
1514          * - created: boolean, whether the revision created the page (default false)
1515          * - oldcountable: boolean or null (default null):
1516          *   - boolean: whether the page was counted as an article before that
1517          *     revision, only used in changed is true and created is false
1518          *   - null: don't change the article count
1519          */
1520         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
1521                 global $wgEnableParserCache;
1522
1523                 wfProfileIn( __METHOD__ );
1524
1525                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
1526                 $text = $revision->getText();
1527
1528                 # Parse the text
1529                 # Be careful not to double-PST: $text is usually already PST-ed once
1530                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
1531                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
1532                         $editInfo = $this->prepareTextForEdit( $text, $revision->getId(), $user );
1533                 } else {
1534                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
1535                         $editInfo = $this->mPreparedEdit;
1536                 }
1537
1538                 # Save it to the parser cache
1539                 if ( $wgEnableParserCache ) {
1540                         $parserCache = ParserCache::singleton();
1541                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
1542                 }
1543
1544                 # Update the links tables
1545                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
1546                 $u->doUpdate();
1547
1548                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
1549
1550                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
1551                         if ( 0 == mt_rand( 0, 99 ) ) {
1552                                 // Flush old entries from the `recentchanges` table; we do this on
1553                                 // random requests so as to avoid an increase in writes for no good reason
1554                                 global $wgRCMaxAge;
1555
1556                                 $dbw = wfGetDB( DB_MASTER );
1557                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
1558                                 $dbw->delete(
1559                                         'recentchanges',
1560                                         array( "rc_timestamp < '$cutoff'" ),
1561                                         __METHOD__
1562                                 );
1563                         }
1564                 }
1565
1566                 if ( !$this->mTitle->exists() ) {
1567                         wfProfileOut( __METHOD__ );
1568                         return;
1569                 }
1570
1571                 $id = $this->getId();
1572                 $title = $this->mTitle->getPrefixedDBkey();
1573                 $shortTitle = $this->mTitle->getDBkey();
1574
1575                 if ( !$options['changed'] ) {
1576                         $good = 0;
1577                         $total = 0;
1578                 } elseif ( $options['created'] ) {
1579                         $good = (int)$this->isCountable( $editInfo );
1580                         $total = 1;
1581                 } elseif ( $options['oldcountable'] !== null ) {
1582                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
1583                         $total = 0;
1584                 } else {
1585                         $good = 0;
1586                         $total = 0;
1587                 }
1588
1589                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
1590                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $text ) );
1591
1592                 # If this is another user's talk page, update newtalk.
1593                 # Don't do this if $options['changed'] = false (null-edits) nor if
1594                 # it's a minor edit and the user doesn't want notifications for those.
1595                 if ( $options['changed']
1596                         && $this->mTitle->getNamespace() == NS_USER_TALK
1597                         && $shortTitle != $user->getTitleKey()
1598                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
1599                 ) {
1600                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
1601                                 $other = User::newFromName( $shortTitle, false );
1602                                 if ( !$other ) {
1603                                         wfDebug( __METHOD__ . ": invalid username\n" );
1604                                 } elseif ( User::isIP( $shortTitle ) ) {
1605                                         // An anonymous user
1606                                         $other->setNewtalk( true );
1607                                 } elseif ( $other->isLoggedIn() ) {
1608                                         $other->setNewtalk( true );
1609                                 } else {
1610                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
1611                                 }
1612                         }
1613                 }
1614
1615                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1616                         MessageCache::singleton()->replace( $shortTitle, $text );
1617                 }
1618
1619                 if( $options['created'] ) {
1620                         self::onArticleCreate( $this->mTitle );
1621                 } else {
1622                         self::onArticleEdit( $this->mTitle );
1623                 }
1624
1625                 wfProfileOut( __METHOD__ );
1626         }
1627
1628         /**
1629          * Edit an article without doing all that other stuff
1630          * The article must already exist; link tables etc
1631          * are not updated, caches are not flushed.
1632          *
1633          * @param $text String: text submitted
1634          * @param $user User The relevant user
1635          * @param $comment String: comment submitted
1636          * @param $minor Boolean: whereas it's a minor modification
1637          */
1638         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
1639                 wfProfileIn( __METHOD__ );
1640
1641                 $dbw = wfGetDB( DB_MASTER );
1642                 $revision = new Revision( array(
1643                         'page'       => $this->getId(),
1644                         'text'       => $text,
1645                         'comment'    => $comment,
1646                         'minor_edit' => $minor ? 1 : 0,
1647                 ) );
1648                 $revision->insertOn( $dbw );
1649                 $this->updateRevisionOn( $dbw, $revision );
1650
1651                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1652
1653                 wfProfileOut( __METHOD__ );
1654         }
1655
1656         /**
1657          * Update the article's restriction field, and leave a log entry.
1658          * This works for protection both existing and non-existing pages.
1659          *
1660          * @param $limit Array: set of restriction keys
1661          * @param $reason String
1662          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1663          * @param $expiry Array: per restriction type expiration
1664          * @param $user User The user updating the restrictions
1665          * @return bool true on success
1666          */
1667         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
1668                 global $wgContLang;
1669
1670                 if ( wfReadOnly() ) {
1671                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
1672                 }
1673
1674                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1675
1676                 $id = $this->mTitle->getArticleID();
1677
1678                 if ( !$cascade ) {
1679                         $cascade = false;
1680                 }
1681
1682                 // Take this opportunity to purge out expired restrictions
1683                 Title::purgeExpiredRestrictions();
1684
1685                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1686                 # we expect a single selection, but the schema allows otherwise.
1687                 $isProtected = false;
1688                 $protect = false;
1689                 $changed = false;
1690
1691                 $dbw = wfGetDB( DB_MASTER );
1692
1693                 foreach ( $restrictionTypes as $action ) {
1694                         if ( !isset( $expiry[$action] ) ) {
1695                                 $expiry[$action] = $dbw->getInfinity();
1696                         }
1697                         if ( !isset( $limit[$action] ) ) {
1698                                 $limit[$action] = '';
1699                         } elseif ( $limit[$action] != '' ) {
1700                                 $protect = true;
1701                         }
1702
1703                         # Get current restrictions on $action
1704                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
1705                         if ( $current != '' ) {
1706                                 $isProtected = true;
1707                         }
1708
1709                         if ( $limit[$action] != $current ) {
1710                                 $changed = true;
1711                         } elseif ( $limit[$action] != '' ) {
1712                                 # Only check expiry change if the action is actually being
1713                                 # protected, since expiry does nothing on an not-protected
1714                                 # action.
1715                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
1716                                         $changed = true;
1717                                 }
1718                         }
1719                 }
1720
1721                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
1722                         $changed = true;
1723                 }
1724
1725                 # If nothing's changed, do nothing
1726                 if ( !$changed ) {
1727                         return Status::newGood();
1728                 }
1729
1730                 if ( !$protect ) { # No protection at all means unprotection
1731                         $revCommentMsg = 'unprotectedarticle';
1732                         $logAction = 'unprotect';
1733                 } elseif ( $isProtected ) {
1734                         $revCommentMsg = 'modifiedarticleprotection';
1735                         $logAction = 'modify';
1736                 } else {
1737                         $revCommentMsg = 'protectedarticle';
1738                         $logAction = 'protect';
1739                 }
1740
1741                 $encodedExpiry = array();
1742                 $protectDescription = '';
1743                 foreach ( $limit as $action => $restrictions ) {
1744                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
1745                         if ( $restrictions != '' ) {
1746                                 $protectDescription .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
1747                                 if ( $encodedExpiry[$action] != 'infinity' ) {
1748                                         $protectDescription .= wfMsgForContent( 'protect-expiring',
1749                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
1750                                                 $wgContLang->date( $expiry[$action], false, false ) ,
1751                                                 $wgContLang->time( $expiry[$action], false, false ) );
1752                                 } else {
1753                                         $protectDescription .= wfMsgForContent( 'protect-expiry-indefinite' );
1754                                 }
1755
1756                                 $protectDescription .= ') ';
1757                         }
1758                 }
1759                 $protectDescription = trim( $protectDescription );
1760
1761                 if ( $id ) { # Protection of existing page
1762                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
1763                                 return Status::newGood();
1764                         }
1765
1766                         # Only restrictions with the 'protect' right can cascade...
1767                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1768                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1769
1770                         # The schema allows multiple restrictions
1771                         if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
1772                                 $cascade = false;
1773                         }
1774
1775                         # Update restrictions table
1776                         foreach ( $limit as $action => $restrictions ) {
1777                                 if ( $restrictions != '' ) {
1778                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
1779                                                 array( 'pr_page' => $id,
1780                                                         'pr_type' => $action,
1781                                                         'pr_level' => $restrictions,
1782                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
1783                                                         'pr_expiry' => $encodedExpiry[$action]
1784                                                 ),
1785                                                 __METHOD__
1786                                         );
1787                                 } else {
1788                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1789                                                 'pr_type' => $action ), __METHOD__ );
1790                                 }
1791                         }
1792
1793                         # Prepare a null revision to be added to the history
1794                         $editComment = $wgContLang->ucfirst( wfMsgForContent( $revCommentMsg, $this->mTitle->getPrefixedText() ) );
1795                         if ( $reason ) {
1796                                 $editComment .= ": $reason";
1797                         }
1798                         if ( $protectDescription ) {
1799                                 $editComment .= " ($protectDescription)";
1800                         }
1801                         if ( $cascade ) {
1802                                 $editComment .= ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
1803                         }
1804
1805                         # Insert a null revision
1806                         $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1807                         $nullRevId = $nullRevision->insertOn( $dbw );
1808
1809                         $latest = $this->getLatest();
1810                         # Update page record
1811                         $dbw->update( 'page',
1812                                 array( /* SET */
1813                                         'page_touched' => $dbw->timestamp(),
1814                                         'page_restrictions' => '',
1815                                         'page_latest' => $nullRevId
1816                                 ), array( /* WHERE */
1817                                         'page_id' => $id
1818                                 ), __METHOD__
1819                         );
1820
1821                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
1822                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
1823                 } else { # Protection of non-existing page (also known as "title protection")
1824                         # Cascade protection is meaningless in this case
1825                         $cascade = false;
1826
1827                         if ( $limit['create'] != '' ) {
1828                                 $dbw->replace( 'protected_titles',
1829                                         array( array( 'pt_namespace', 'pt_title' ) ),
1830                                         array(
1831                                                 'pt_namespace' => $this->mTitle->getNamespace(),
1832                                                 'pt_title' => $this->mTitle->getDBkey(),
1833                                                 'pt_create_perm' => $limit['create'],
1834                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
1835                                                 'pt_expiry' => $encodedExpiry['create'],
1836                                                 'pt_user' => $user->getId(),
1837                                                 'pt_reason' => $reason,
1838                                         ), __METHOD__
1839                                 );
1840                         } else {
1841                                 $dbw->delete( 'protected_titles',
1842                                         array(
1843                                                 'pt_namespace' => $this->mTitle->getNamespace(),
1844                                                 'pt_title' => $this->mTitle->getDBkey()
1845                                         ), __METHOD__
1846                                 );
1847                         }
1848                 }
1849
1850                 $this->mTitle->flushRestrictions();
1851
1852                 if ( $logAction == 'unprotect' ) {
1853                         $logParams = array();
1854                 } else {
1855                         $logParams = array( $protectDescription, $cascade ? 'cascade' : '' );
1856                 }
1857
1858                 # Update the protection log
1859                 $log = new LogPage( 'protect' );
1860                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $logParams, $user );
1861
1862                 return Status::newGood();
1863         }
1864
1865         /**
1866          * Take an array of page restrictions and flatten it to a string
1867          * suitable for insertion into the page_restrictions field.
1868          * @param $limit Array
1869          * @return String
1870          */
1871         protected static function flattenRestrictions( $limit ) {
1872                 if ( !is_array( $limit ) ) {
1873                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
1874                 }
1875
1876                 $bits = array();
1877                 ksort( $limit );
1878
1879                 foreach ( $limit as $action => $restrictions ) {
1880                         if ( $restrictions != '' ) {
1881                                 $bits[] = "$action=$restrictions";
1882                         }
1883                 }
1884
1885                 return implode( ':', $bits );
1886         }
1887
1888         /**
1889          * Back-end article deletion
1890          * Deletes the article with database consistency, writes logs, purges caches
1891          *
1892          * @param $reason string delete reason for deletion log
1893          * @param $suppress bitfield
1894          *      Revision::DELETED_TEXT
1895          *      Revision::DELETED_COMMENT
1896          *      Revision::DELETED_USER
1897          *      Revision::DELETED_RESTRICTED
1898          * @param $id int article ID
1899          * @param $commit boolean defaults to true, triggers transaction end
1900          * @param &$errors Array of errors to append to
1901          * @param $user User The relevant user
1902          * @return boolean true if successful
1903          */
1904         public function doDeleteArticle(
1905                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
1906         ) {
1907                 global $wgUser;
1908                 $user = is_null( $user ) ? $wgUser : $user;
1909
1910                 wfDebug( __METHOD__ . "\n" );
1911
1912                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
1913                         return false;
1914                 }
1915                 $dbw = wfGetDB( DB_MASTER );
1916                 $t = $this->mTitle->getDBkey();
1917                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
1918
1919                 if ( $t === '' || $id == 0 ) {
1920                         return false;
1921                 }
1922
1923                 // Bitfields to further suppress the content
1924                 if ( $suppress ) {
1925                         $bitfield = 0;
1926                         // This should be 15...
1927                         $bitfield |= Revision::DELETED_TEXT;
1928                         $bitfield |= Revision::DELETED_COMMENT;
1929                         $bitfield |= Revision::DELETED_USER;
1930                         $bitfield |= Revision::DELETED_RESTRICTED;
1931                 } else {
1932                         $bitfield = 'rev_deleted';
1933                 }
1934
1935                 $dbw->begin();
1936                 // For now, shunt the revision data into the archive table.
1937                 // Text is *not* removed from the text table; bulk storage
1938                 // is left intact to avoid breaking block-compression or
1939                 // immutable storage schemes.
1940                 //
1941                 // For backwards compatibility, note that some older archive
1942                 // table entries will have ar_text and ar_flags fields still.
1943                 //
1944                 // In the future, we may keep revisions and mark them with
1945                 // the rev_deleted field, which is reserved for this purpose.
1946                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
1947                         array(
1948                                 'ar_namespace'  => 'page_namespace',
1949                                 'ar_title'      => 'page_title',
1950                                 'ar_comment'    => 'rev_comment',
1951                                 'ar_user'       => 'rev_user',
1952                                 'ar_user_text'  => 'rev_user_text',
1953                                 'ar_timestamp'  => 'rev_timestamp',
1954                                 'ar_minor_edit' => 'rev_minor_edit',
1955                                 'ar_rev_id'     => 'rev_id',
1956                                 'ar_parent_id'  => 'rev_parent_id',
1957                                 'ar_text_id'    => 'rev_text_id',
1958                                 'ar_text'       => '\'\'', // Be explicit to appease
1959                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
1960                                 'ar_len'        => 'rev_len',
1961                                 'ar_page_id'    => 'page_id',
1962                                 'ar_deleted'    => $bitfield,
1963                                 'ar_sha1'       => 'rev_sha1'
1964                         ), array(
1965                                 'page_id' => $id,
1966                                 'page_id = rev_page'
1967                         ), __METHOD__
1968                 );
1969
1970                 # Now that it's safely backed up, delete it
1971                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
1972                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
1973
1974                 if ( !$ok ) {
1975                         $dbw->rollback();
1976                         return false;
1977                 }
1978
1979                 $this->doDeleteUpdates( $id );
1980
1981                 # Log the deletion, if the page was suppressed, log it at Oversight instead
1982                 $logtype = $suppress ? 'suppress' : 'delete';
1983
1984                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
1985                 $logEntry->setPerformer( $user );
1986                 $logEntry->setTarget( $this->mTitle );
1987                 $logEntry->setComment( $reason );
1988                 $logid = $logEntry->insert();
1989                 $logEntry->publish( $logid );
1990
1991                 if ( $commit ) {
1992                         $dbw->commit();
1993                 }
1994
1995                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
1996                 return true;
1997         }
1998
1999         /**
2000          * Do some database updates after deletion
2001          *
2002          * @param $id Int: page_id value of the page being deleted
2003          */
2004         public function doDeleteUpdates( $id ) {
2005                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2006
2007                 $dbw = wfGetDB( DB_MASTER );
2008
2009                 # Delete restrictions for it
2010                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2011
2012                 # Fix category table counts
2013                 $cats = array();
2014                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2015
2016                 foreach ( $res as $row ) {
2017                         $cats [] = $row->cl_to;
2018                 }
2019
2020                 $this->updateCategoryCounts( array(), $cats );
2021
2022                 # If using cascading deletes, we can skip some explicit deletes
2023                 if ( !$dbw->cascadingDeletes() ) {
2024                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2025
2026                         # Delete outgoing links
2027                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ), __METHOD__ );
2028                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ), __METHOD__ );
2029                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ), __METHOD__ );
2030                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ), __METHOD__ );
2031                         $dbw->delete( 'externallinks', array( 'el_from' => $id ), __METHOD__ );
2032                         $dbw->delete( 'langlinks', array( 'll_from' => $id ), __METHOD__ );
2033                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ), __METHOD__ );
2034                         $dbw->delete( 'redirect', array( 'rd_from' => $id ), __METHOD__ );
2035                         $dbw->delete( 'page_props', array( 'pp_page' => $id ), __METHOD__ );
2036                 }
2037
2038                 # If using cleanup triggers, we can skip some manual deletes
2039                 if ( !$dbw->cleanupTriggers() ) {
2040                         # Clean up recentchanges entries...
2041                         $dbw->delete( 'recentchanges',
2042                                 array( 'rc_type != ' . RC_LOG,
2043                                         'rc_namespace' => $this->mTitle->getNamespace(),
2044                                         'rc_title' => $this->mTitle->getDBkey() ),
2045                                 __METHOD__ );
2046                         $dbw->delete( 'recentchanges',
2047                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
2048                                 __METHOD__ );
2049                 }
2050
2051                 # Clear caches
2052                 self::onArticleDelete( $this->mTitle );
2053
2054                 # Clear the cached article id so the interface doesn't act like we exist
2055                 $this->mTitle->resetArticleID( 0 );
2056         }
2057
2058         /**
2059          * Roll back the most recent consecutive set of edits to a page
2060          * from the same user; fails if there are no eligible edits to
2061          * roll back to, e.g. user is the sole contributor. This function
2062          * performs permissions checks on $user, then calls commitRollback()
2063          * to do the dirty work
2064          *
2065          * @todo: seperate the business/permission stuff out from backend code
2066          *
2067          * @param $fromP String: Name of the user whose edits to rollback.
2068          * @param $summary String: Custom summary. Set to default summary if empty.
2069          * @param $token String: Rollback token.
2070          * @param $bot Boolean: If true, mark all reverted edits as bot.
2071          *
2072          * @param $resultDetails Array: contains result-specific array of additional values
2073          *    'alreadyrolled' : 'current' (rev)
2074          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2075          *
2076          * @param $user User The user performing the rollback
2077          * @return array of errors, each error formatted as
2078          *   array(messagekey, param1, param2, ...).
2079          * On success, the array is empty.  This array can also be passed to
2080          * OutputPage::showPermissionsErrorPage().
2081          */
2082         public function doRollback(
2083                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2084         ) {
2085                 $resultDetails = null;
2086
2087                 # Check permissions
2088                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2089                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2090                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2091
2092                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2093                         $errors[] = array( 'sessionfailure' );
2094                 }
2095
2096                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2097                         $errors[] = array( 'actionthrottledtext' );
2098                 }
2099
2100                 # If there were errors, bail out now
2101                 if ( !empty( $errors ) ) {
2102                         return $errors;
2103                 }
2104
2105                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2106         }
2107
2108         /**
2109          * Backend implementation of doRollback(), please refer there for parameter
2110          * and return value documentation
2111          *
2112          * NOTE: This function does NOT check ANY permissions, it just commits the
2113          * rollback to the DB. Therefore, you should only call this function direct-
2114          * ly if you want to use custom permissions checks. If you don't, use
2115          * doRollback() instead.
2116          * @param $fromP String: Name of the user whose edits to rollback.
2117          * @param $summary String: Custom summary. Set to default summary if empty.
2118          * @param $bot Boolean: If true, mark all reverted edits as bot.
2119          *
2120          * @param $resultDetails Array: contains result-specific array of additional values
2121          * @param $guser User The user performing the rollback
2122          */
2123         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2124                 global $wgUseRCPatrol, $wgContLang;
2125
2126                 $dbw = wfGetDB( DB_MASTER );
2127
2128                 if ( wfReadOnly() ) {
2129                         return array( array( 'readonlytext' ) );
2130                 }
2131
2132                 # Get the last editor
2133                 $current = Revision::newFromTitle( $this->mTitle );
2134                 if ( is_null( $current ) ) {
2135                         # Something wrong... no page?
2136                         return array( array( 'notanarticle' ) );
2137                 }
2138
2139                 $from = str_replace( '_', ' ', $fromP );
2140                 # User name given should match up with the top revision.
2141                 # If the user was deleted then $from should be empty.
2142                 if ( $from != $current->getUserText() ) {
2143                         $resultDetails = array( 'current' => $current );
2144                         return array( array( 'alreadyrolled',
2145                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2146                                 htmlspecialchars( $fromP ),
2147                                 htmlspecialchars( $current->getUserText() )
2148                         ) );
2149                 }
2150
2151                 # Get the last edit not by this guy...
2152                 # Note: these may not be public values
2153                 $user = intval( $current->getRawUser() );
2154                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2155                 $s = $dbw->selectRow( 'revision',
2156                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2157                         array( 'rev_page' => $current->getPage(),
2158                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2159                         ), __METHOD__,
2160                         array( 'USE INDEX' => 'page_timestamp',
2161                                 'ORDER BY' => 'rev_timestamp DESC' )
2162                         );
2163                 if ( $s === false ) {
2164                         # No one else ever edited this page
2165                         return array( array( 'cantrollback' ) );
2166                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2167                         # Only admins can see this text
2168                         return array( array( 'notvisiblerev' ) );
2169                 }
2170
2171                 $set = array();
2172                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2173                         # Mark all reverted edits as bot
2174                         $set['rc_bot'] = 1;
2175                 }
2176
2177                 if ( $wgUseRCPatrol ) {
2178                         # Mark all reverted edits as patrolled
2179                         $set['rc_patrolled'] = 1;
2180                 }
2181
2182                 if ( count( $set ) ) {
2183                         $dbw->update( 'recentchanges', $set,
2184                                 array( /* WHERE */
2185                                         'rc_cur_id' => $current->getPage(),
2186                                         'rc_user_text' => $current->getUserText(),
2187                                         "rc_timestamp > '{$s->rev_timestamp}'",
2188                                 ), __METHOD__
2189                         );
2190                 }
2191
2192                 # Generate the edit summary if necessary
2193                 $target = Revision::newFromId( $s->rev_id );
2194                 if ( empty( $summary ) ) {
2195                         if ( $from == '' ) { // no public user name
2196                                 $summary = wfMsgForContent( 'revertpage-nouser' );
2197                         } else {
2198                                 $summary = wfMsgForContent( 'revertpage' );
2199                         }
2200                 }
2201
2202                 # Allow the custom summary to use the same args as the default message
2203                 $args = array(
2204                         $target->getUserText(), $from, $s->rev_id,
2205                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2206                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2207                 );
2208                 $summary = wfMsgReplaceArgs( $summary, $args );
2209
2210                 # Save
2211                 $flags = EDIT_UPDATE;
2212
2213                 if ( $guser->isAllowed( 'minoredit' ) ) {
2214                         $flags |= EDIT_MINOR;
2215                 }
2216
2217                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2218                         $flags |= EDIT_FORCE_BOT;
2219                 }
2220
2221                 # Actually store the edit
2222                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
2223                 if ( !empty( $status->value['revision'] ) ) {
2224                         $revId = $status->value['revision']->getId();
2225                 } else {
2226                         $revId = false;
2227                 }
2228
2229                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
2230
2231                 $resultDetails = array(
2232                         'summary' => $summary,
2233                         'current' => $current,
2234                         'target'  => $target,
2235                         'newid'   => $revId
2236                 );
2237
2238                 return array();
2239         }
2240
2241         /**
2242          * The onArticle*() functions are supposed to be a kind of hooks
2243          * which should be called whenever any of the specified actions
2244          * are done.
2245          *
2246          * This is a good place to put code to clear caches, for instance.
2247          *
2248          * This is called on page move and undelete, as well as edit
2249          *
2250          * @param $title Title object
2251          */
2252         public static function onArticleCreate( $title ) {
2253                 # Update existence markers on article/talk tabs...
2254                 if ( $title->isTalkPage() ) {
2255                         $other = $title->getSubjectPage();
2256                 } else {
2257                         $other = $title->getTalkPage();
2258                 }
2259
2260                 $other->invalidateCache();
2261                 $other->purgeSquid();
2262
2263                 $title->touchLinks();
2264                 $title->purgeSquid();
2265                 $title->deleteTitleProtection();
2266         }
2267
2268         /**
2269          * Clears caches when article is deleted
2270          *
2271          * @param $title Title
2272          */
2273         public static function onArticleDelete( $title ) {
2274                 # Update existence markers on article/talk tabs...
2275                 if ( $title->isTalkPage() ) {
2276                         $other = $title->getSubjectPage();
2277                 } else {
2278                         $other = $title->getTalkPage();
2279                 }
2280
2281                 $other->invalidateCache();
2282                 $other->purgeSquid();
2283
2284                 $title->touchLinks();
2285                 $title->purgeSquid();
2286
2287                 # File cache
2288                 HTMLFileCache::clearFileCache( $title );
2289
2290                 # Messages
2291                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2292                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2293                 }
2294
2295                 # Images
2296                 if ( $title->getNamespace() == NS_FILE ) {
2297                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2298                         $update->doUpdate();
2299                 }
2300
2301                 # User talk pages
2302                 if ( $title->getNamespace() == NS_USER_TALK ) {
2303                         $user = User::newFromName( $title->getText(), false );
2304                         if ( $user ) {
2305                                 $user->setNewtalk( false );
2306                         }
2307                 }
2308
2309                 # Image redirects
2310                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2311         }
2312
2313         /**
2314          * Purge caches on page update etc
2315          *
2316          * @param $title Title object
2317          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2318          */
2319         public static function onArticleEdit( $title ) {
2320                 // Invalidate caches of articles which include this page
2321                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2322
2323
2324                 // Invalidate the caches of all pages which redirect here
2325                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2326
2327                 # Purge squid for this page only
2328                 $title->purgeSquid();
2329
2330                 # Clear file cache for this page only
2331                 HTMLFileCache::clearFileCache( $title );
2332         }
2333
2334         /**#@-*/
2335
2336         /**
2337          * Returns a list of hidden categories this page is a member of.
2338          * Uses the page_props and categorylinks tables.
2339          *
2340          * @return Array of Title objects
2341          */
2342         public function getHiddenCategories() {
2343                 $result = array();
2344                 $id = $this->mTitle->getArticleID();
2345
2346                 if ( $id == 0 ) {
2347                         return array();
2348                 }
2349
2350                 $dbr = wfGetDB( DB_SLAVE );
2351                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2352                         array( 'cl_to' ),
2353                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2354                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2355                         __METHOD__ );
2356
2357                 if ( $res !== false ) {
2358                         foreach ( $res as $row ) {
2359                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2360                         }
2361                 }
2362
2363                 return $result;
2364         }
2365
2366         /**
2367         * Return an applicable autosummary if one exists for the given edit.
2368         * @param $oldtext String: the previous text of the page.
2369         * @param $newtext String: The submitted text of the page.
2370         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2371         * @return string An appropriate autosummary, or an empty string.
2372         */
2373         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2374                 global $wgContLang;
2375
2376                 # Decide what kind of autosummary is needed.
2377
2378                 # Redirect autosummaries
2379                 $ot = Title::newFromRedirect( $oldtext );
2380                 $rt = Title::newFromRedirect( $newtext );
2381
2382                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
2383                         $truncatedtext = $wgContLang->truncate(
2384                                 str_replace( "\n", ' ', $newtext ),
2385                                 max( 0, 250
2386                                         - strlen( wfMsgForContent( 'autoredircomment' ) )
2387                                         - strlen( $rt->getFullText() )
2388                                 ) );
2389                         return wfMsgForContent( 'autoredircomment', $rt->getFullText(), $truncatedtext );
2390                 }
2391
2392                 # New page autosummaries
2393                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
2394                         # If they're making a new article, give its text, truncated, in the summary.
2395
2396                         $truncatedtext = $wgContLang->truncate(
2397                                 str_replace( "\n", ' ', $newtext ),
2398                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
2399
2400                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
2401                 }
2402
2403                 # Blanking autosummaries
2404                 if ( $oldtext != '' && $newtext == '' ) {
2405                         return wfMsgForContent( 'autosumm-blank' );
2406                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
2407                         # Removing more than 90% of the article
2408
2409                         $truncatedtext = $wgContLang->truncate(
2410                                 $newtext,
2411                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
2412
2413                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
2414                 }
2415
2416                 # If we reach this point, there's no applicable autosummary for our case, so our
2417                 # autosummary is empty.
2418                 return '';
2419         }
2420
2421         /**
2422          * Auto-generates a deletion reason
2423          *
2424          * @param &$hasHistory Boolean: whether the page has a history
2425          * @return mixed String containing deletion reason or empty string, or boolean false
2426          *    if no revision occurred
2427          */
2428         public function getAutoDeleteReason( &$hasHistory ) {
2429                 global $wgContLang;
2430
2431                 $dbw = wfGetDB( DB_MASTER );
2432                 // Get the last revision
2433                 $rev = Revision::newFromTitle( $this->getTitle() );
2434
2435                 if ( is_null( $rev ) ) {
2436                         return false;
2437                 }
2438
2439                 // Get the article's contents
2440                 $contents = $rev->getText();
2441                 $blank = false;
2442
2443                 // If the page is blank, use the text from the previous revision,
2444                 // which can only be blank if there's a move/import/protect dummy revision involved
2445                 if ( $contents == '' ) {
2446                         $prev = $rev->getPrevious();
2447
2448                         if ( $prev )    {
2449                                 $contents = $prev->getText();
2450                                 $blank = true;
2451                         }
2452                 }
2453
2454                 // Find out if there was only one contributor
2455                 // Only scan the last 20 revisions
2456                 $res = $dbw->select( 'revision', 'rev_user_text',
2457                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2458                         __METHOD__,
2459                         array( 'LIMIT' => 20 )
2460                 );
2461
2462                 if ( $res === false ) {
2463                         // This page has no revisions, which is very weird
2464                         return false;
2465                 }
2466
2467                 $hasHistory = ( $res->numRows() > 1 );
2468                 $row = $dbw->fetchObject( $res );
2469
2470                 if ( $row ) { // $row is false if the only contributor is hidden
2471                         $onlyAuthor = $row->rev_user_text;
2472                         // Try to find a second contributor
2473                         foreach ( $res as $row ) {
2474                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2475                                         $onlyAuthor = false;
2476                                         break;
2477                                 }
2478                         }
2479                 } else {
2480                         $onlyAuthor = false;
2481                 }
2482
2483                 // Generate the summary with a '$1' placeholder
2484                 if ( $blank ) {
2485                         // The current revision is blank and the one before is also
2486                         // blank. It's just not our lucky day
2487                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2488                 } else {
2489                         if ( $onlyAuthor ) {
2490                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2491                         } else {
2492                                 $reason = wfMsgForContent( 'excontent', '$1' );
2493                         }
2494                 }
2495
2496                 if ( $reason == '-' ) {
2497                         // Allow these UI messages to be blanked out cleanly
2498                         return '';
2499                 }
2500
2501                 // Replace newlines with spaces to prevent uglyness
2502                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2503                 // Calculate the maximum amount of chars to get
2504                 // Max content length = max comment length - length of the comment (excl. $1)
2505                 $maxLength = 255 - ( strlen( $reason ) - 2 );
2506                 $contents = $wgContLang->truncate( $contents, $maxLength );
2507                 // Remove possible unfinished links
2508                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2509                 // Now replace the '$1' placeholder
2510                 $reason = str_replace( '$1', $contents, $reason );
2511
2512                 return $reason;
2513         }
2514
2515         /**
2516          * Update all the appropriate counts in the category table, given that
2517          * we've added the categories $added and deleted the categories $deleted.
2518          *
2519          * @param $added array   The names of categories that were added
2520          * @param $deleted array The names of categories that were deleted
2521          */
2522         public function updateCategoryCounts( $added, $deleted ) {
2523                 $ns = $this->mTitle->getNamespace();
2524                 $dbw = wfGetDB( DB_MASTER );
2525
2526                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2527                 # exist, we might legitimately not create it, but it's simpler to just
2528                 # create it and then give it a negative value, since the value is bogus
2529                 # anyway.
2530                 #
2531                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2532                 $insertCats = array_merge( $added, $deleted );
2533                 if ( !$insertCats ) {
2534                         # Okay, nothing to do
2535                         return;
2536                 }
2537
2538                 $insertRows = array();
2539
2540                 foreach ( $insertCats as $cat ) {
2541                         $insertRows[] = array(
2542                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2543                                 'cat_title' => $cat
2544                         );
2545                 }
2546                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2547
2548                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2549                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2550
2551                 if ( $ns == NS_CATEGORY ) {
2552                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2553                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2554                 } elseif ( $ns == NS_FILE ) {
2555                         $addFields[]    = 'cat_files = cat_files + 1';
2556                         $removeFields[] = 'cat_files = cat_files - 1';
2557                 }
2558
2559                 if ( $added ) {
2560                         $dbw->update(
2561                                 'category',
2562                                 $addFields,
2563                                 array( 'cat_title' => $added ),
2564                                 __METHOD__
2565                         );
2566                 }
2567
2568                 if ( $deleted ) {
2569                         $dbw->update(
2570                                 'category',
2571                                 $removeFields,
2572                                 array( 'cat_title' => $deleted ),
2573                                 __METHOD__
2574                         );
2575                 }
2576         }
2577
2578         /**
2579          * Updates cascading protections
2580          *
2581          * @param $parserOutput ParserOutput object for the current version
2582          */
2583         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
2584                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
2585                         return;
2586                 }
2587
2588                 // templatelinks table may have become out of sync,
2589                 // especially if using variable-based transclusions.
2590                 // For paranoia, check if things have changed and if
2591                 // so apply updates to the database. This will ensure
2592                 // that cascaded protections apply as soon as the changes
2593                 // are visible.
2594
2595                 # Get templates from templatelinks
2596                 $id = $this->mTitle->getArticleID();
2597
2598                 $tlTemplates = array();
2599
2600                 $dbr = wfGetDB( DB_SLAVE );
2601                 $res = $dbr->select( array( 'templatelinks' ),
2602                         array( 'tl_namespace', 'tl_title' ),
2603                         array( 'tl_from' => $id ),
2604                         __METHOD__
2605                 );
2606
2607                 foreach ( $res as $row ) {
2608                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
2609                 }
2610
2611                 # Get templates from parser output.
2612                 $poTemplates = array();
2613                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
2614                         foreach ( $templates as $dbk => $id ) {
2615                                 $poTemplates["$ns:$dbk"] = true;
2616                         }
2617                 }
2618
2619                 # Get the diff
2620                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
2621
2622                 if ( count( $templates_diff ) > 0 ) {
2623                         # Whee, link updates time.
2624                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
2625                         $u->doUpdate();
2626                 }
2627         }
2628
2629         /**
2630          * Return a list of templates used by this article.
2631          * Uses the templatelinks table
2632          *
2633          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
2634          * @return Array of Title objects
2635          */
2636         public function getUsedTemplates() {
2637                 return $this->mTitle->getTemplateLinksFrom();
2638         }
2639
2640         /**
2641          * Perform article updates on a special page creation.
2642          *
2643          * @param $rev Revision object
2644          *
2645          * @todo This is a shitty interface function. Kill it and replace the
2646          * other shitty functions like doEditUpdates and such so it's not needed
2647          * anymore.
2648          * @deprecated since 1.18, use doEditUpdates()
2649          */
2650         public function createUpdates( $rev ) {
2651                 wfDeprecated( __METHOD__, '1.18' );
2652                 global $wgUser;
2653                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
2654         }
2655
2656         /**
2657          * This function is called right before saving the wikitext,
2658          * so we can do things like signatures and links-in-context.
2659          *
2660          * @deprecated in 1.19; use Parser::preSaveTransform() instead
2661          * @param $text String article contents
2662          * @param $user User object: user doing the edit
2663          * @param $popts ParserOptions object: parser options, default options for
2664          *               the user loaded if null given
2665          * @return string article contents with altered wikitext markup (signatures
2666          *      converted, {{subst:}}, templates, etc.)
2667          */
2668         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2669                 global $wgParser, $wgUser;
2670
2671                 wfDeprecated( __METHOD__, '1.19' );
2672
2673                 $user = is_null( $user ) ? $wgUser : $user;
2674
2675                 if ( $popts === null ) {
2676                         $popts = ParserOptions::newFromUser( $user );
2677                 }
2678
2679                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2680         }
2681
2682         /**
2683          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
2684          *
2685          * @deprecated in 1.19; use Title::isBigDeletion() instead.
2686          * @return bool
2687          */
2688         public function isBigDeletion() {
2689                 wfDeprecated( __METHOD__, '1.19' );
2690                 return $this->mTitle->isBigDeletion();
2691         }
2692
2693         /**
2694          * Get the  approximate revision count of this page.
2695          *
2696          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
2697          * @return int
2698          */
2699         public function estimateRevisionCount() {
2700                 wfDeprecated( __METHOD__, '1.19' );
2701                 return $this->mTitle->estimateRevisionCount();
2702         }
2703
2704         /**
2705          * Update the article's restriction field, and leave a log entry.
2706          *
2707          * @deprecated since 1.19
2708          * @param $limit Array: set of restriction keys
2709          * @param $reason String
2710          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2711          * @param $expiry Array: per restriction type expiration
2712          * @param $user User The user updating the restrictions
2713          * @return bool true on success
2714          */
2715         public function updateRestrictions(
2716                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
2717         ) {
2718                 global $wgUser;
2719
2720                 $user = is_null( $user ) ? $wgUser : $user;
2721
2722                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
2723         }
2724
2725         /**
2726          * @deprecated since 1.18
2727          */
2728         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2729                 wfDeprecated( __METHOD__, '1.18' );
2730                 global $wgUser;
2731                 return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
2732         }
2733
2734         /**
2735          * @deprecated since 1.18
2736          */
2737         public function viewUpdates() {
2738                 wfDeprecated( __METHOD__, '1.18' );
2739                 global $wgUser;
2740                 return $this->doViewUpdates( $wgUser );
2741         }
2742
2743         /**
2744          * @deprecated since 1.18
2745          */
2746         public function useParserCache( $oldid ) {
2747                 wfDeprecated( __METHOD__, '1.18' );
2748                 global $wgUser;
2749                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
2750         }
2751 }
2752
2753 class PoolWorkArticleView extends PoolCounterWork {
2754
2755         /**
2756          * @var Page
2757          */
2758         private $page;
2759
2760         /**
2761          * @var string
2762          */
2763         private $cacheKey;
2764
2765         /**
2766          * @var integer
2767          */
2768         private $revid;
2769
2770         /**
2771          * @var ParserOptions
2772          */
2773         private $parserOptions;
2774
2775         /**
2776          * @var string|null
2777          */
2778         private $text;
2779
2780         /**
2781          * @var ParserOutput|false
2782          */
2783         private $parserOutput = false;
2784
2785         /**
2786          * @var bool
2787          */
2788         private $isDirty = false;
2789
2790         /**
2791          * @var Status|false
2792          */
2793         private $error = false;
2794
2795         /**
2796          * Constructor
2797          *
2798          * @param $page Page
2799          * @param $revid Integer: ID of the revision being parsed
2800          * @param $useParserCache Boolean: whether to use the parser cache
2801          * @param $parserOptions parserOptions to use for the parse operation
2802          * @param $text String: text to parse or null to load it
2803          */
2804         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $text = null ) {
2805                 $this->page = $page;
2806                 $this->revid = $revid;
2807                 $this->cacheable = $useParserCache;
2808                 $this->parserOptions = $parserOptions;
2809                 $this->text = $text;
2810                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
2811                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
2812         }
2813
2814         /**
2815          * Get the ParserOutput from this object, or false in case of failure
2816          *
2817          * @return ParserOutput
2818          */
2819         public function getParserOutput() {
2820                 return $this->parserOutput;
2821         }
2822
2823         /**
2824          * Get whether the ParserOutput is a dirty one (i.e. expired)
2825          *
2826          * @return bool
2827          */
2828         public function getIsDirty() {
2829                 return $this->isDirty;
2830         }
2831
2832         /**
2833          * Get a Status object in case of error or false otherwise
2834          *
2835          * @return Status|false
2836          */
2837         public function getError() {
2838                 return $this->error;
2839         }
2840
2841         /**
2842          * @return bool
2843          */
2844         function doWork() {
2845                 global $wgParser, $wgUseFileCache;
2846
2847                 $isCurrent = $this->revid === $this->page->getLatest();
2848
2849                 if ( $this->text !== null ) {
2850                         $text = $this->text;
2851                 } elseif ( $isCurrent ) {
2852                         $text = $this->page->getRawText();
2853                 } else {
2854                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
2855                         if ( $rev === null ) {
2856                                 return false;
2857                         }
2858                         $text = $rev->getText();
2859                 }
2860
2861                 $time = - wfTime();
2862                 $this->parserOutput = $wgParser->parse( $text, $this->page->getTitle(),
2863                         $this->parserOptions, true, true, $this->revid );
2864                 $time += wfTime();
2865
2866                 # Timing hack
2867                 if ( $time > 3 ) {
2868                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
2869                                 $this->page->getTitle()->getPrefixedDBkey() ) );
2870                 }
2871
2872                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
2873                         ParserCache::singleton()->save( $this->parserOutput, $this->page, $this->parserOptions );
2874                 }
2875
2876                 // Make sure file cache is not used on uncacheable content.
2877                 // Output that has magic words in it can still use the parser cache
2878                 // (if enabled), though it will generally expire sooner.
2879                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
2880                         $wgUseFileCache = false;
2881                 }
2882
2883                 if ( $isCurrent ) {
2884                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
2885                 }
2886
2887                 return true;
2888         }
2889
2890         /**
2891          * @return bool
2892          */
2893         function getCachedWork() {
2894                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
2895
2896                 if ( $this->parserOutput === false ) {
2897                         wfDebug( __METHOD__ . ": parser cache miss\n" );
2898                         return false;
2899                 } else {
2900                         wfDebug( __METHOD__ . ": parser cache hit\n" );
2901                         return true;
2902                 }
2903         }
2904
2905         /**
2906          * @return bool
2907          */
2908         function fallback() {
2909                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
2910
2911                 if ( $this->parserOutput === false ) {
2912                         wfDebugLog( 'dirty', "dirty missing\n" );
2913                         wfDebug( __METHOD__ . ": no dirty cache\n" );
2914                         return false;
2915                 } else {
2916                         wfDebug( __METHOD__ . ": sending dirty output\n" );
2917                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
2918                         $this->isDirty = true;
2919                         return true;
2920                 }
2921         }
2922
2923         /**
2924          * @param $status Status
2925          */
2926         function error( $status ) {
2927                 $this->error = $status;
2928                 return false;
2929         }
2930 }