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