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