includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @file
   5  */
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * See design.txt for an overview.
  11  * Note: edit user interface and cache support functions have been
  12  * moved to separate EditPage and HTMLFileCache classes.
  13  *
  14  */
  15 class Article {
  16         /**@{{
  17          * @private
  18          */
  19         var $mComment = '';               //!<
  20         var $mContent;                    //!<
  21         var $mContentLoaded = false;      //!<
  22         var $mCounter = -1;               //!< Not loaded
  23         var $mCurID = -1;                 //!< Not loaded
  24         var $mDataLoaded = false;         //!<
  25         var $mForUpdate = false;          //!<
  26         var $mGoodAdjustment = 0;         //!<
  27         var $mIsRedirect = false;         //!<
  28         var $mLatest = false;             //!<
  29         var $mMinorEdit;                  //!<
  30         var $mOldId;                      //!<
  31         var $mPreparedEdit = false;       //!< Title object if set
  32         var $mRedirectedFrom = null;      //!< Title object if set
  33         var $mRedirectTarget = null;      //!< Title object if set
  34         var $mRedirectUrl = false;        //!<
  35         var $mRevIdFetched = 0;           //!<
  36         var $mRevision;                   //!<
  37         var $mTimestamp = '';             //!<
  38         var $mTitle;                      //!<
  39         var $mTotalAdjustment = 0;        //!<
  40         var $mTouched = '19700101000000'; //!<
  41         var $mUser = -1;                  //!< Not loaded
  42         var $mUserText = '';              //!<
  43         /**@}}*/
  44
  45         /**
  46          * Constructor and clear the article
  47          * @param $title Reference to a Title object.
  48          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  49          */
  50         public function __construct( Title $title, $oldId = null ) {
  51                 $this->mTitle =& $title;
  52                 $this->mOldId = $oldId;
  53         }
  54
  55         /**
  56          * Constructor from an article article
  57          * @param $id The article ID to load
  58          */
  59         public static function newFromID( $id ) {
  60                 $t = Title::newFromID( $id );
  61                 return $t == null ? null : new Article( $t );
  62         }
  63
  64         /**
  65          * Tell the page view functions that this view was redirected
  66          * from another page on the wiki.
  67          * @param $from Title object.
  68          */
  69         public function setRedirectedFrom( $from ) {
  70                 $this->mRedirectedFrom = $from;
  71         }
  72
  73         /**
  74          * If this page is a redirect, get its target
  75          *
  76          * The target will be fetched from the redirect table if possible.
  77          * If this page doesn't have an entry there, call insertRedirect()
  78          * @return mixed Title object, or null if this page is not a redirect
  79          */
  80         public function getRedirectTarget() {
  81                 if( !$this->mTitle || !$this->mTitle->isRedirect() )
  82                         return null;
  83                 if( !is_null($this->mRedirectTarget) )
  84                         return $this->mRedirectTarget;
  85                 # Query the redirect table
  86                 $dbr = wfGetDB( DB_SLAVE );
  87                 $res = $dbr->select( 'redirect',
  88                         array('rd_namespace', 'rd_title'),
  89                         array('rd_from' => $this->getID()),
  90                         __METHOD__
  91                 );
  92                 if( $row = $dbr->fetchObject($res) ) {
  93                         return $this->mRedirectTarget = Title::makeTitle($row->rd_namespace, $row->rd_title);
  94                 }
  95                 # This page doesn't have an entry in the redirect table
  96                 return $this->mRedirectTarget = $this->insertRedirect();
  97         }
  98
  99         /**
 100          * Insert an entry for this page into the redirect table.
 101          *
 102          * Don't call this function directly unless you know what you're doing.
 103          * @return Title object
 104          */
 105         public function insertRedirect() {
 106                 $retval = Title::newFromRedirect( $this->getContent() );
 107                 if( !$retval ) {
 108                         return null;
 109                 }
 110                 $dbw = wfGetDB( DB_MASTER );
 111                 $dbw->replace( 'redirect', array('rd_from'),
 112                         array(
 113                                 'rd_from' => $this->getID(),
 114                                 'rd_namespace' => $retval->getNamespace(),
 115                                 'rd_title' => $retval->getDBKey()
 116                         ),
 117                         __METHOD__
 118                 );
 119                 return $retval;
 120         }
 121
 122         /**
 123          * Get the Title object this page redirects to
 124          *
 125          * @return mixed false, Title of in-wiki target, or string with URL
 126          */
 127         public function followRedirect() {
 128                 $text = $this->getContent();
 129                 return $this->followRedirectText( $text );
 130         }
 131
 132         /**
 133          * Get the Title object this text redirects to
 134          *
 135          * @return mixed false, Title of in-wiki target, or string with URL
 136          */
 137         public function followRedirectText( $text ) {
 138                 $rt = Title::newFromRedirect( $text );
 139                 # process if title object is valid and not special:userlogout
 140                 if( $rt ) {
 141                         if( $rt->getInterwiki() != '' ) {
 142                                 if( $rt->isLocal() ) {
 143                                         // Offsite wikis need an HTTP redirect.
 144                                         //
 145                                         // This can be hard to reverse and may produce loops,
 146                                         // so they may be disabled in the site configuration.
 147                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 148                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 149                                 }
 150                         } else {
 151                                 if( $rt->getNamespace() == NS_SPECIAL ) {
 152                                         // Gotta handle redirects to special pages differently:
 153                                         // Fill the HTTP response "Location" header and ignore
 154                                         // the rest of the page we're on.
 155                                         //
 156                                         // This can be hard to reverse, so they may be disabled.
 157                                         if( $rt->isSpecial( 'Userlogout' ) ) {
 158                                                 // rolleyes
 159                                         } else {
 160                                                 return $rt->getFullURL();
 161                                         }
 162                                 }
 163                                 return $rt;
 164                         }
 165                 }
 166                 // No or invalid redirect
 167                 return false;
 168         }
 169
 170         /**
 171          * get the title object of the article
 172          */
 173         public function getTitle() {
 174                 return $this->mTitle;
 175         }
 176
 177         /**
 178          * Clear the object
 179          * @private
 180          */
 181         public function clear() {
 182                 $this->mDataLoaded    = false;
 183                 $this->mContentLoaded = false;
 184
 185                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 186                 $this->mRedirectedFrom = null; # Title object if set
 187                 $this->mRedirectTarget = null; # Title object if set
 188                 $this->mUserText =
 189                 $this->mTimestamp = $this->mComment = '';
 190                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 191                 $this->mTouched = '19700101000000';
 192                 $this->mForUpdate = false;
 193                 $this->mIsRedirect = false;
 194                 $this->mRevIdFetched = 0;
 195                 $this->mRedirectUrl = false;
 196                 $this->mLatest = false;
 197                 $this->mPreparedEdit = false;
 198         }
 199
 200         /**
 201          * Note that getContent/loadContent do not follow redirects anymore.
 202          * If you need to fetch redirectable content easily, try
 203          * the shortcut in Article::followContent()
 204          *
 205          * @return Return the text of this revision
 206         */
 207         public function getContent() {
 208                 global $wgUser, $wgContLang, $wgOut, $wgMessageCache;
 209                 wfProfileIn( __METHOD__ );
 210                 if( $this->getID() === 0 ) {
 211                         # If this is a MediaWiki:x message, then load the messages
 212                         # and return the message value for x.
 213                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 214                                 # If this is a system message, get the default text.
 215                                 list( $message, $lang ) = $wgMessageCache->figureMessage( $wgContLang->lcfirst( $this->mTitle->getText() ) );
 216                                 $wgMessageCache->loadAllMessages( $lang );
 217                                 $text = wfMsgGetKey( $message, false, $lang, false );
 218                                 if( wfEmptyMsg( $message, $text ) )
 219                                         $text = '';
 220                         } else {
 221                                 $text = wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' );
 222                         }
 223                         wfProfileOut( __METHOD__ );
 224                         return $text;
 225                 } else {
 226                         $this->loadContent();
 227                         wfProfileOut( __METHOD__ );
 228                         return $this->mContent;
 229                 }
 230         }
 231
 232         /**
 233          * This function returns the text of a section, specified by a number ($section).
 234          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 235          * the first section before any such heading (section 0).
 236          *
 237          * If a section contains subsections, these are also returned.
 238          *
 239          * @param $text String: text to look in
 240          * @param $section Integer: section number
 241          * @return string text of the requested section
 242          * @deprecated
 243          */
 244         public function getSection( $text, $section ) {
 245                 global $wgParser;
 246                 return $wgParser->getSection( $text, $section );
 247         }
 248
 249         /**
 250          * @return int The oldid of the article that is to be shown, 0 for the
 251          *             current revision
 252          */
 253         public function getOldID() {
 254                 if( is_null( $this->mOldId ) ) {
 255                         $this->mOldId = $this->getOldIDFromRequest();
 256                 }
 257                 return $this->mOldId;
 258         }
 259
 260         /**
 261          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 262          *
 263          * @return int The old id for the request
 264          */
 265         public function getOldIDFromRequest() {
 266                 global $wgRequest;
 267                 $this->mRedirectUrl = false;
 268                 $oldid = $wgRequest->getVal( 'oldid' );
 269                 if( isset( $oldid ) ) {
 270                         $oldid = intval( $oldid );
 271                         if( $wgRequest->getVal( 'direction' ) == 'next' ) {
 272                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 273                                 if( $nextid  ) {
 274                                         $oldid = $nextid;
 275                                 } else {
 276                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 277                                 }
 278                         } elseif( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 279                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 280                                 if( $previd ) {
 281                                         $oldid = $previd;
 282                                 }
 283                         }
 284                 }
 285                 if( !$oldid ) {
 286                         $oldid = 0;
 287                 }
 288                 return $oldid;
 289         }
 290
 291         /**
 292          * Load the revision (including text) into this object
 293          */
 294         function loadContent() {
 295                 if( $this->mContentLoaded ) return;
 296                 wfProfileIn( __METHOD__ );
 297                 # Query variables :P
 298                 $oldid = $this->getOldID();
 299                 # Pre-fill content with error message so that if something
 300                 # fails we'll have something telling us what we intended.
 301                 $this->mOldId = $oldid;
 302                 $this->fetchContent( $oldid );
 303                 wfProfileOut( __METHOD__ );
 304         }
 305
 306
 307         /**
 308          * Fetch a page record with the given conditions
 309          * @param $dbr Database object
 310          * @param $conditions Array
 311          */
 312         protected function pageData( $dbr, $conditions ) {
 313                 $fields = array(
 314                                 'page_id',
 315                                 'page_namespace',
 316                                 'page_title',
 317                                 'page_restrictions',
 318                                 'page_counter',
 319                                 'page_is_redirect',
 320                                 'page_is_new',
 321                                 'page_random',
 322                                 'page_touched',
 323                                 'page_latest',
 324                                 'page_len',
 325                 );
 326                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 327                 $row = $dbr->selectRow(
 328                         'page',
 329                         $fields,
 330                         $conditions,
 331                         __METHOD__
 332                 );
 333                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 334                 return $row ;
 335         }
 336
 337         /**
 338          * @param $dbr Database object
 339          * @param $title Title object
 340          */
 341         public function pageDataFromTitle( $dbr, $title ) {
 342                 return $this->pageData( $dbr, array(
 343                         'page_namespace' => $title->getNamespace(),
 344                         'page_title'     => $title->getDBkey() ) );
 345         }
 346
 347         /**
 348          * @param $dbr Database
 349          * @param $id Integer
 350          */
 351         protected function pageDataFromId( $dbr, $id ) {
 352                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 353         }
 354
 355         /**
 356          * Set the general counter, title etc data loaded from
 357          * some source.
 358          *
 359          * @param $data Database row object or "fromdb"
 360          */
 361         public function loadPageData( $data = 'fromdb' ) {
 362                 if( $data === 'fromdb' ) {
 363                         $dbr = wfGetDB( DB_MASTER );
 364                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 365                 }
 366
 367                 $lc = LinkCache::singleton();
 368                 if( $data ) {
 369                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 370
 371                         $this->mTitle->mArticleID = $data->page_id;
 372
 373                         # Old-fashioned restrictions
 374                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 375
 376                         $this->mCounter     = $data->page_counter;
 377                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 378                         $this->mIsRedirect  = $data->page_is_redirect;
 379                         $this->mLatest      = $data->page_latest;
 380                 } else {
 381                         if( is_object( $this->mTitle ) ) {
 382                                 $lc->addBadLinkObj( $this->mTitle );
 383                         }
 384                         $this->mTitle->mArticleID = 0;
 385                 }
 386
 387                 $this->mDataLoaded  = true;
 388         }
 389
 390         /**
 391          * Get text of an article from database
 392          * Does *NOT* follow redirects.
 393          * @param $oldid Int: 0 for whatever the latest revision is
 394          * @return string
 395          */
 396         function fetchContent( $oldid = 0 ) {
 397                 if( $this->mContentLoaded ) {
 398                         return $this->mContent;
 399                 }
 400
 401                 $dbr = wfGetDB( DB_MASTER );
 402
 403                 # Pre-fill content with error message so that if something
 404                 # fails we'll have something telling us what we intended.
 405                 $t = $this->mTitle->getPrefixedText();
 406                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 407                 $this->mContent = wfMsg( 'missing-article', $t, $d ) ;
 408
 409                 if( $oldid ) {
 410                         $revision = Revision::newFromId( $oldid );
 411                         if( is_null( $revision ) ) {
 412                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 413                                 return false;
 414                         }
 415                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 416                         if( !$data ) {
 417                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 418                                 return false;
 419                         }
 420                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 421                         $this->loadPageData( $data );
 422                 } else {
 423                         if( !$this->mDataLoaded ) {
 424                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 425                                 if( !$data ) {
 426                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 427                                         return false;
 428                                 }
 429                                 $this->loadPageData( $data );
 430                         }
 431                         $revision = Revision::newFromId( $this->mLatest );
 432                         if( is_null( $revision ) ) {
 433                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$this->mLatest}\n" );
 434                                 return false;
 435                         }
 436                 }
 437
 438                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 439                 // We should instead work with the Revision object when we need it...
 440                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 441
 442                 $this->mUser      = $revision->getUser();
 443                 $this->mUserText  = $revision->getUserText();
 444                 $this->mComment   = $revision->getComment();
 445                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 446
 447                 $this->mRevIdFetched = $revision->getId();
 448                 $this->mContentLoaded = true;
 449                 $this->mRevision =& $revision;
 450
 451                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 452
 453                 return $this->mContent;
 454         }
 455
 456         /**
 457          * Read/write accessor to select FOR UPDATE
 458          *
 459          * @param $x Mixed: FIXME
 460          */
 461         public function forUpdate( $x = NULL ) {
 462                 return wfSetVar( $this->mForUpdate, $x );
 463         }
 464
 465         /**
 466          * Get the database which should be used for reads
 467          *
 468          * @return Database
 469          * @deprecated - just call wfGetDB( DB_MASTER ) instead
 470          */
 471         function getDB() {
 472                 wfDeprecated( __METHOD__ );
 473                 return wfGetDB( DB_MASTER );
 474         }
 475
 476         /**
 477          * Get options for all SELECT statements
 478          *
 479          * @param $options Array: an optional options array which'll be appended to
 480          *                       the default
 481          * @return Array: options
 482          */
 483         protected function getSelectOptions( $options = '' ) {
 484                 if( $this->mForUpdate ) {
 485                         if( is_array( $options ) ) {
 486                                 $options[] = 'FOR UPDATE';
 487                         } else {
 488                                 $options = 'FOR UPDATE';
 489                         }
 490                 }
 491                 return $options;
 492         }
 493
 494         /**
 495          * @return int Page ID
 496          */
 497         public function getID() {
 498                 if( $this->mTitle ) {
 499                         return $this->mTitle->getArticleID();
 500                 } else {
 501                         return 0;
 502                 }
 503         }
 504
 505         /**
 506          * @return bool Whether or not the page exists in the database
 507          */
 508         public function exists() {
 509                 return $this->getId() > 0;
 510         }
 511
 512         /**
 513          * @return int The view count for the page
 514          */
 515         public function getCount() {
 516                 if( -1 == $this->mCounter ) {
 517                         $id = $this->getID();
 518                         if( $id == 0 ) {
 519                                 $this->mCounter = 0;
 520                         } else {
 521                                 $dbr = wfGetDB( DB_SLAVE );
 522                                 $this->mCounter = $dbr->selectField( 'page',
 523                                         'page_counter',
 524                                         array( 'page_id' => $id ),
 525                                         __METHOD__,
 526                                         $this->getSelectOptions()
 527                                 );
 528                         }
 529                 }
 530                 return $this->mCounter;
 531         }
 532
 533         /**
 534          * Determine whether a page  would be suitable for being counted as an
 535          * article in the site_stats table based on the title & its content
 536          *
 537          * @param $text String: text to analyze
 538          * @return bool
 539          */
 540         public function isCountable( $text ) {
 541                 global $wgUseCommaCount;
 542
 543                 $token = $wgUseCommaCount ? ',' : '[[';
 544                 return $this->mTitle->isContentPage() && !$this->isRedirect($text) && in_string($token,$text);
 545         }
 546
 547         /**
 548          * Tests if the article text represents a redirect
 549          *
 550          * @param $text String: FIXME
 551          * @return bool
 552          */
 553         public function isRedirect( $text = false ) {
 554                 if( $text === false ) {
 555                         if( $this->mDataLoaded ) {
 556                                 return $this->mIsRedirect;
 557                         }
 558                         // Apparently loadPageData was never called
 559                         $this->loadContent();
 560                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 561                 } else {
 562                         $titleObj = Title::newFromRedirect( $text );
 563                 }
 564                 return $titleObj !== NULL;
 565         }
 566
 567         /**
 568          * Returns true if the currently-referenced revision is the current edit
 569          * to this page (and it exists).
 570          * @return bool
 571          */
 572         public function isCurrent() {
 573                 # If no oldid, this is the current version.
 574                 if( $this->getOldID() == 0 ) {
 575                         return true;
 576                 }
 577                 return $this->exists() && isset($this->mRevision) && $this->mRevision->isCurrent();
 578         }
 579
 580         /**
 581          * Loads everything except the text
 582          * This isn't necessary for all uses, so it's only done if needed.
 583          */
 584         protected function loadLastEdit() {
 585                 if( -1 != $this->mUser )
 586                         return;
 587
 588                 # New or non-existent articles have no user information
 589                 $id = $this->getID();
 590                 if( 0 == $id ) return;
 591
 592                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 593                 if( !is_null( $this->mLastRevision ) ) {
 594                         $this->mUser      = $this->mLastRevision->getUser();
 595                         $this->mUserText  = $this->mLastRevision->getUserText();
 596                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 597                         $this->mComment   = $this->mLastRevision->getComment();
 598                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 599                         $this->mRevIdFetched = $this->mLastRevision->getId();
 600                 }
 601         }
 602
 603         public function getTimestamp() {
 604                 // Check if the field has been filled by ParserCache::get()
 605                 if( !$this->mTimestamp ) {
 606                         $this->loadLastEdit();
 607                 }
 608                 return wfTimestamp(TS_MW, $this->mTimestamp);
 609         }
 610
 611         public function getUser() {
 612                 $this->loadLastEdit();
 613                 return $this->mUser;
 614         }
 615
 616         public function getUserText() {
 617                 $this->loadLastEdit();
 618                 return $this->mUserText;
 619         }
 620
 621         public function getComment() {
 622                 $this->loadLastEdit();
 623                 return $this->mComment;
 624         }
 625
 626         public function getMinorEdit() {
 627                 $this->loadLastEdit();
 628                 return $this->mMinorEdit;
 629         }
 630
 631         /* Use this to fetch the rev ID used on page views */
 632         public function getRevIdFetched() {
 633                 $this->loadLastEdit();
 634                 return $this->mRevIdFetched;
 635         }
 636
 637         /**
 638          * @param $limit Integer: default 0.
 639          * @param $offset Integer: default 0.
 640          */
 641         public function getContributors($limit = 0, $offset = 0) {
 642                 # XXX: this is expensive; cache this info somewhere.
 643
 644                 $contribs = array();
 645                 $dbr = wfGetDB( DB_SLAVE );
 646                 $revTable = $dbr->tableName( 'revision' );
 647                 $userTable = $dbr->tableName( 'user' );
 648                 $user = $this->getUser();
 649                 $pageId = $this->getId();
 650
 651                 $sql = "SELECT {$userTable}.*, MAX(rev_timestamp) as timestamp
 652                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 653                         WHERE rev_page = $pageId
 654                         AND rev_user != $user
 655                         GROUP BY rev_user, rev_user_text, user_real_name
 656                         ORDER BY timestamp DESC";
 657
 658                 if($limit > 0) { $sql .= ' LIMIT '.$limit; }
 659                 if($offset > 0) { $sql .= ' OFFSET '.$offset; }
 660
 661                 $sql .= ' '. $this->getSelectOptions();
 662
 663                 $res = $dbr->query($sql, __METHOD__ );
 664
 665                 return new UserArrayFromResult( $res );
 666         }
 667
 668         /**
 669          * This is the default action of the script: just view the page of
 670          * the given title.
 671         */
 672         public function view() {
 673                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 674                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 675                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 676                 global $wgDefaultRobotPolicy;
 677
 678                 wfProfileIn( __METHOD__ );
 679
 680                 # Get variables from query string
 681                 $oldid = $this->getOldID();
 682
 683                 # Try file cache
 684                 if( $oldid === 0 && $this->checkTouched() ) {
 685                         global $wgUseETag;
 686                         if( $wgUseETag ) {
 687                                 $parserCache = ParserCache::singleton();
 688                                 $wgOut->setETag( $parserCache->getETag($this,$wgUser) );
 689                         }
 690                         if( $wgOut->checkLastModified( $this->getTouched() ) ) {
 691                                 wfProfileOut( __METHOD__ );
 692                                 return;
 693                         } else if( $this->tryFileCache() ) {
 694                                 # tell wgOut that output is taken care of
 695                                 $wgOut->disable();
 696                                 $this->viewUpdates();
 697                                 wfProfileOut( __METHOD__ );
 698                                 return;
 699                         }
 700                 }
 701
 702                 $ns = $this->mTitle->getNamespace(); # shortcut
 703                 $sk = $wgUser->getSkin();
 704
 705                 # getOldID may want us to redirect somewhere else
 706                 if( $this->mRedirectUrl ) {
 707                         $wgOut->redirect( $this->mRedirectUrl );
 708                         wfProfileOut( __METHOD__ );
 709                         return;
 710                 }
 711
 712                 $diff = $wgRequest->getVal( 'diff' );
 713                 $rcid = $wgRequest->getVal( 'rcid' );
 714                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 715                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 716                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 717
 718                 $wgOut->setArticleFlag( true );
 719
 720                 # Discourage indexing of printable versions, but encourage following
 721                 if( $wgOut->isPrintable() ) {
 722                         $policy = 'noindex,follow';
 723                 } elseif( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 724                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 725                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 726                         # Honour customised robot policies for this namespace
 727                         $policy = $wgNamespaceRobotPolicies[$ns];
 728                 } else {
 729                         $policy = $wgDefaultRobotPolicy;
 730                 }
 731                 $wgOut->setRobotPolicy( $policy );
 732
 733                 # If we got diff and oldid in the query, we want to see a
 734                 # diff page instead of the article.
 735
 736                 if( !is_null( $diff ) ) {
 737                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 738
 739                         $diff = $wgRequest->getVal( 'diff' );
 740                         $htmldiff = $wgRequest->getVal( 'htmldiff' , false);
 741                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $htmldiff);
 742                         // DifferenceEngine directly fetched the revision:
 743                         $this->mRevIdFetched = $de->mNewid;
 744                         $de->showDiffPage( $diffOnly );
 745
 746                         // Needed to get the page's current revision
 747                         $this->loadPageData();
 748                         if( $diff == 0 || $diff == $this->mLatest ) {
 749                                 # Run view updates for current revision only
 750                                 $this->viewUpdates();
 751                         }
 752                         wfProfileOut( __METHOD__ );
 753                         return;
 754                 }
 755
 756                 # Should the parser cache be used?
 757                 $pcache = $this->useParserCache( $oldid );
 758                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 759                 if( $wgUser->getOption( 'stubthreshold' ) ) {
 760                         wfIncrStats( 'pcache_miss_stub' );
 761                 }
 762
 763                 $wasRedirected = false;
 764                 if( isset( $this->mRedirectedFrom ) ) {
 765                         // This is an internally redirected page view.
 766                         // We'll need a backlink to the source page for navigation.
 767                         if( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 768                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 769                                 $s = wfMsg( 'redirectedfrom', $redir );
 770                                 $wgOut->setSubtitle( $s );
 771
 772                                 // Set the fragment if one was specified in the redirect
 773                                 if( strval( $this->mTitle->getFragment() ) != '' ) {
 774                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 775                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 776                                 }
 777                                 $wasRedirected = true;
 778                         }
 779                 } elseif( !empty( $rdfrom ) ) {
 780                         // This is an externally redirected view, from some other wiki.
 781                         // If it was reported from a trusted site, supply a backlink.
 782                         global $wgRedirectSources;
 783                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 784                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 785                                 $s = wfMsg( 'redirectedfrom', $redir );
 786                                 $wgOut->setSubtitle( $s );
 787                                 $wasRedirected = true;
 788                         }
 789                 }
 790
 791                 $outputDone = false;
 792                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 793                 if( $pcache && $wgOut->tryParserCache( $this, $wgUser ) ) {
 794                         // Ensure that UI elements requiring revision ID have
 795                         // the correct version information.
 796                         $wgOut->setRevisionId( $this->mLatest );
 797                         $outputDone = true;
 798                 }
 799                 # Fetch content and check for errors
 800                 if( !$outputDone ) {
 801                         # If the article does not exist and was deleted, show the log
 802                         if( $this->getID() == 0 ) {
 803                                 $this->showDeletionLog();
 804                         }
 805                         $text = $this->getContent();
 806                         if( $text === false ) {
 807                                 # Failed to load, replace text with error message
 808                                 $t = $this->mTitle->getPrefixedText();
 809                                 if( $oldid ) {
 810                                         $d = wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid );
 811                                         $text = wfMsg( 'missing-article', $t, $d );
 812                                 } else {
 813                                         $text = wfMsg( 'noarticletext' );
 814                                 }
 815                         }
 816                         # Non-existent pages
 817                         if( $this->getID() === 0 ) {
 818                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 819                                 $text = "<div class='noarticletext'>\n$text\n</div>";
 820                         }
 821
 822                         # Another whitelist check in case oldid is altering the title
 823                         if( !$this->mTitle->userCanRead() ) {
 824                                 $wgOut->loginToUse();
 825                                 $wgOut->output();
 826                                 wfProfileOut( __METHOD__ );
 827                                 exit;
 828                         }
 829
 830                         # We're looking at an old revision
 831                         if( !empty( $oldid ) ) {
 832                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 833                                 if( is_null( $this->mRevision ) ) {
 834                                         // FIXME: This would be a nice place to load the 'no such page' text.
 835                                 } else {
 836                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 837                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 838                                                 if( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 839                                                         $wgOut->addWikiMsg( 'rev-deleted-text-permission' );
 840                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 841                                                         wfProfileOut( __METHOD__ );
 842                                                         return;
 843                                                 } else {
 844                                                         $wgOut->addWikiMsg( 'rev-deleted-text-view' );
 845                                                         // and we are allowed to see...
 846                                                 }
 847                                         }
 848                                 }
 849                         }
 850
 851                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 852
 853                          // Pages containing custom CSS or JavaScript get special treatment
 854                         if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 855                                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
 856                                 // Give hooks a chance to customise the output
 857                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 858                                         // Wrap the whole lot in a <pre> and don't parse
 859                                         $m = array();
 860                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 861                                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 862                                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 863                                         $wgOut->addHTML( "\n</pre>\n" );
 864                                 }
 865                         } else if( $rt = Title::newFromRedirect( $text ) ) {
 866                                 # Don't append the subtitle if this was an old revision
 867                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 868                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 869                                 $wgOut->addParserOutputNoText( $parseout );
 870                         } else if( $pcache ) {
 871                                 # Display content and save to parser cache
 872                                 $this->outputWikiText( $text );
 873                         } else {
 874                                 # Display content, don't attempt to save to parser cache
 875                                 # Don't show section-edit links on old revisions... this way lies madness.
 876                                 if( !$this->isCurrent() ) {
 877                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 878                                 }
 879                                 # Display content and don't save to parser cache
 880                                 # With timing hack -- TS 2006-07-26
 881                                 $time = -wfTime();
 882                                 $this->outputWikiText( $text, false );
 883                                 $time += wfTime();
 884
 885                                 # Timing hack
 886                                 if( $time > 3 ) {
 887                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 888                                                 $this->mTitle->getPrefixedDBkey()));
 889                                 }
 890
 891                                 if( !$this->isCurrent() ) {
 892                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 893                                 }
 894                         }
 895                 }
 896                 /* title may have been set from the cache */
 897                 $t = $wgOut->getPageTitle();
 898                 if( empty( $t ) ) {
 899                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 900
 901                         # For the main page, overwrite the <title> element with the con-
 902                         # tents of 'pagetitle-view-mainpage' instead of the default (if
 903                         # that's not empty).
 904                         if( $this->mTitle->equals( Title::newMainPage() ) &&
 905                         wfMsgForContent( 'pagetitle-view-mainpage' ) !== '' ) {
 906                                 $wgOut->setHTMLTitle( wfMsgForContent( 'pagetitle-view-mainpage' ) );
 907                         }
 908                 }
 909
 910                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 911                 if( $ns == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
 912                         $wgOut->addWikiMsg('anontalkpagetext');
 913                 }
 914
 915                 # If we have been passed an &rcid= parameter, we want to give the user a
 916                 # chance to mark this new article as patrolled.
 917                 if( !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) && $this->mTitle->exists() ) {
 918                         $wgOut->addHTML(
 919                                 "<div class='patrollink'>" .
 920                                         wfMsgHtml( 'markaspatrolledlink',
 921                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
 922                                                 "action=markpatrolled&rcid=$rcid" )
 923                                         ) .
 924                                 '</div>'
 925                          );
 926                 }
 927
 928                 # Trackbacks
 929                 if( $wgUseTrackbacks ) {
 930                         $this->addTrackbacks();
 931                 }
 932
 933                 $this->viewUpdates();
 934                 wfProfileOut( __METHOD__ );
 935         }
 936
 937         protected function showDeletionLog() {
 938                 global $wgUser, $wgOut;
 939                 $loglist = new LogEventsList( $wgUser->getSkin(), $wgOut );
 940                 $pager = new LogPager( $loglist, 'delete', false, $this->mTitle->getPrefixedText() );
 941                 if( $pager->getNumRows() > 0 ) {
 942                         $pager->mLimit = 10;
 943                         $wgOut->addHTML( '<div class="mw-warning-with-logexcerpt">' );
 944                         $wgOut->addWikiMsg( 'deleted-notice' );
 945                         $wgOut->addHTML(
 946                                 $loglist->beginLogEventsList() .
 947                                 $pager->getBody() .
 948                                 $loglist->endLogEventsList()
 949                         );
 950                         if( $pager->getNumRows() > 10 ) {
 951                                 $wgOut->addHTML( $wgUser->getSkin()->link(
 952                                         SpecialPage::getTitleFor( 'Log' ),
 953                                         wfMsgHtml( 'deletelog-fulllog' ),
 954                                         array(),
 955                                         array( 'type' => 'delete', 'page' => $this->mTitle->getPrefixedText() )
 956                                 ) );
 957                         }
 958                         $wgOut->addHTML( '</div>' );
 959                 }
 960         }
 961
 962         /*
 963         * Should the parser cache be used?
 964         */
 965         protected function useParserCache( $oldid ) {
 966                 global $wgUser, $wgEnableParserCache;
 967
 968                 return $wgEnableParserCache
 969                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
 970                         && $this->exists()
 971                         && empty( $oldid )
 972                         && !$this->mTitle->isCssOrJsPage()
 973                         && !$this->mTitle->isCssJsSubpage();
 974         }
 975
 976         /**
 977          * View redirect
 978          * @param $target Title object of destination to redirect
 979          * @param $appendSubtitle Boolean [optional]
 980          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
 981          */
 982         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
 983                 global $wgParser, $wgOut, $wgContLang, $wgStylePath, $wgUser;
 984                 # Display redirect
 985                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 986                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 987
 988                 if( $appendSubtitle ) {
 989                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 990                 }
 991                 $sk = $wgUser->getSkin();
 992                 if( $forceKnown ) {
 993                         $link = $sk->makeKnownLinkObj( $target, htmlspecialchars( $target->getFullText() ) );
 994                 } else {
 995                         $link = $sk->makeLinkObj( $target, htmlspecialchars( $target->getFullText() ) );
 996                 }
 997                 return '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
 998                         '<span class="redirectText">'.$link.'</span>';
 999
1000         }
1001
1002         public function addTrackbacks() {
1003                 global $wgOut, $wgUser;
1004                 $dbr = wfGetDB( DB_SLAVE );
1005                 $tbs = $dbr->select( 'trackbacks',
1006                         array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
1007                         array('tb_page' => $this->getID() )
1008                 );
1009                 if( !$dbr->numRows($tbs) ) return;
1010
1011                 $tbtext = "";
1012                 while( $o = $dbr->fetchObject($tbs) ) {
1013                         $rmvtxt = "";
1014                         if( $wgUser->isAllowed( 'trackback' ) ) {
1015                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid=" .
1016                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1017                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1018                         }
1019                         $tbtext .= "\n";
1020                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
1021                                         $o->tb_title,
1022                                         $o->tb_url,
1023                                         $o->tb_ex,
1024                                         $o->tb_name,
1025                                         $rmvtxt);
1026                 }
1027                 $wgOut->addWikiMsg( 'trackbackbox', $tbtext );
1028                 $this->mTitle->invalidateCache();
1029         }
1030
1031         public function deletetrackback() {
1032                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
1033                 if( !$wgUser->matchEditToken($wgRequest->getVal('token')) ) {
1034                         $wgOut->addWikiMsg( 'sessionfailure' );
1035                         return;
1036                 }
1037
1038                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1039                 if( count($permission_errors) ) {
1040                         $wgOut->showPermissionsErrorPage( $permission_errors );
1041                         return;
1042                 }
1043
1044                 $db = wfGetDB( DB_MASTER );
1045                 $db->delete( 'trackbacks', array('tb_id' => $wgRequest->getInt('tbid')) );
1046
1047                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1048                 $this->mTitle->invalidateCache();
1049         }
1050
1051         public function render() {
1052                 global $wgOut;
1053                 $wgOut->setArticleBodyOnly(true);
1054                 $this->view();
1055         }
1056
1057         /**
1058          * Handle action=purge
1059          */
1060         public function purge() {
1061                 global $wgUser, $wgRequest, $wgOut;
1062                 if( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1063                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1064                                 $this->doPurge();
1065                                 $this->view();
1066                         }
1067                 } else {
1068                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1069                         $button = wfMsgExt( 'confirm_purge_button', array('escapenoentities') );
1070                         $form = "<form method=\"post\" action=\"$action\">\n" .
1071                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1072                                         "</form>\n";
1073                         $top = wfMsgExt( 'confirm-purge-top', array('parse') );
1074                         $bottom = wfMsgExt( 'confirm-purge-bottom', array('parse') );
1075                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1076                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1077                         $wgOut->addHTML( $top . $form . $bottom );
1078                 }
1079         }
1080
1081         /**
1082          * Perform the actions of a page purging
1083          */
1084         public function doPurge() {
1085                 global $wgUseSquid;
1086                 // Invalidate the cache
1087                 $this->mTitle->invalidateCache();
1088
1089                 if( $wgUseSquid ) {
1090                         // Commit the transaction before the purge is sent
1091                         $dbw = wfGetDB( DB_MASTER );
1092                         $dbw->immediateCommit();
1093
1094                         // Send purge
1095                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1096                         $update->doUpdate();
1097                 }
1098                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1099                         global $wgMessageCache;
1100                         if( $this->getID() == 0 ) {
1101                                 $text = false;
1102                         } else {
1103                                 $text = $this->getContent();
1104                         }
1105                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1106                 }
1107         }
1108
1109         /**
1110          * Insert a new empty page record for this article.
1111          * This *must* be followed up by creating a revision
1112          * and running $this->updateToLatest( $rev_id );
1113          * or else the record will be left in a funky state.
1114          * Best if all done inside a transaction.
1115          *
1116          * @param $dbw Database
1117          * @return int The newly created page_id key, or false if the title already existed
1118          * @private
1119          */
1120         public function insertOn( $dbw ) {
1121                 wfProfileIn( __METHOD__ );
1122
1123                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1124                 $dbw->insert( 'page', array(
1125                         'page_id'           => $page_id,
1126                         'page_namespace'    => $this->mTitle->getNamespace(),
1127                         'page_title'        => $this->mTitle->getDBkey(),
1128                         'page_counter'      => 0,
1129                         'page_restrictions' => '',
1130                         'page_is_redirect'  => 0, # Will set this shortly...
1131                         'page_is_new'       => 1,
1132                         'page_random'       => wfRandom(),
1133                         'page_touched'      => $dbw->timestamp(),
1134                         'page_latest'       => 0, # Fill this in shortly...
1135                         'page_len'          => 0, # Fill this in shortly...
1136                 ), __METHOD__, 'IGNORE' );
1137
1138                 $affected = $dbw->affectedRows();
1139                 if( $affected ) {
1140                         $newid = $dbw->insertId();
1141                         $this->mTitle->resetArticleId( $newid );
1142                 }
1143                 wfProfileOut( __METHOD__ );
1144                 return $affected ? $newid : false;
1145         }
1146
1147         /**
1148          * Update the page record to point to a newly saved revision.
1149          *
1150          * @param $dbw Database object
1151          * @param $revision Revision: For ID number, and text used to set
1152                             length and redirect status fields
1153          * @param $lastRevision Integer: if given, will not overwrite the page field
1154          *                      when different from the currently set value.
1155          *                      Giving 0 indicates the new page flag should be set
1156          *                      on.
1157          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1158          *                                                       removing rows in redirect table.
1159          * @return bool true on success, false on failure
1160          * @private
1161          */
1162         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1163                 wfProfileIn( __METHOD__ );
1164
1165                 $text = $revision->getText();
1166                 $rt = Title::newFromRedirect( $text );
1167
1168                 $conditions = array( 'page_id' => $this->getId() );
1169                 if( !is_null( $lastRevision ) ) {
1170                         # An extra check against threads stepping on each other
1171                         $conditions['page_latest'] = $lastRevision;
1172                 }
1173
1174                 $dbw->update( 'page',
1175                         array( /* SET */
1176                                 'page_latest'      => $revision->getId(),
1177                                 'page_touched'     => $dbw->timestamp(),
1178                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1179                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1180                                 'page_len'         => strlen( $text ),
1181                         ),
1182                         $conditions,
1183                         __METHOD__ );
1184
1185                 $result = $dbw->affectedRows() != 0;
1186                 if( $result ) {
1187                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1188                 }
1189
1190                 wfProfileOut( __METHOD__ );
1191                 return $result;
1192         }
1193
1194         /**
1195          * Add row to the redirect table if this is a redirect, remove otherwise.
1196          *
1197          * @param $dbw Database
1198          * @param $redirectTitle a title object pointing to the redirect target,
1199          *                                               or NULL if this is not a redirect
1200          * @param $lastRevIsRedirect If given, will optimize adding and
1201          *                                                       removing rows in redirect table.
1202          * @return bool true on success, false on failure
1203          * @private
1204          */
1205         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1206                 // Always update redirects (target link might have changed)
1207                 // Update/Insert if we don't know if the last revision was a redirect or not
1208                 // Delete if changing from redirect to non-redirect
1209                 $isRedirect = !is_null($redirectTitle);
1210                 if($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1211                         wfProfileIn( __METHOD__ );
1212                         if( $isRedirect ) {
1213                                 // This title is a redirect, Add/Update row in the redirect table
1214                                 $set = array( /* SET */
1215                                         'rd_namespace' => $redirectTitle->getNamespace(),
1216                                         'rd_title'     => $redirectTitle->getDBkey(),
1217                                         'rd_from'      => $this->getId(),
1218                                 );
1219                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1220                         } else {
1221                                 // This is not a redirect, remove row from redirect table
1222                                 $where = array( 'rd_from' => $this->getId() );
1223                                 $dbw->delete( 'redirect', $where, __METHOD__);
1224                         }
1225                         if( $this->getTitle()->getNamespace() == NS_FILE ) {
1226                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1227                         }
1228                         wfProfileOut( __METHOD__ );
1229                         return ( $dbw->affectedRows() != 0 );
1230                 }
1231                 return true;
1232         }
1233
1234         /**
1235          * If the given revision is newer than the currently set page_latest,
1236          * update the page record. Otherwise, do nothing.
1237          *
1238          * @param $dbw Database object
1239          * @param $revision Revision object
1240          */
1241         public function updateIfNewerOn( &$dbw, $revision ) {
1242                 wfProfileIn( __METHOD__ );
1243                 $row = $dbw->selectRow(
1244                         array( 'revision', 'page' ),
1245                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1246                         array(
1247                                 'page_id' => $this->getId(),
1248                                 'page_latest=rev_id' ),
1249                         __METHOD__ );
1250                 if( $row ) {
1251                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1252                                 wfProfileOut( __METHOD__ );
1253                                 return false;
1254                         }
1255                         $prev = $row->rev_id;
1256                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1257                 } else {
1258                         # No or missing previous revision; mark the page as new
1259                         $prev = 0;
1260                         $lastRevIsRedirect = null;
1261                 }
1262                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1263                 wfProfileOut( __METHOD__ );
1264                 return $ret;
1265         }
1266
1267         /**
1268          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1269          * @return string Complete article text, or null if error
1270          */
1271         public function replaceSection( $section, $text, $summary = '', $edittime = NULL ) {
1272                 wfProfileIn( __METHOD__ );
1273                 if( strval( $section ) == '' ) {
1274                         // Whole-page edit; let the whole text through
1275                 } else {
1276                         if( is_null($edittime) ) {
1277                                 $rev = Revision::newFromTitle( $this->mTitle );
1278                         } else {
1279                                 $dbw = wfGetDB( DB_MASTER );
1280                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1281                         }
1282                         if( !$rev ) {
1283                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1284                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1285                                 return null;
1286                         }
1287                         $oldtext = $rev->getText();
1288
1289                         if( $section == 'new' ) {
1290                                 # Inserting a new section
1291                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1292                                 $text = strlen( trim( $oldtext ) ) > 0
1293                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1294                                                 : "{$subject}{$text}";
1295                         } else {
1296                                 # Replacing an existing section; roll out the big guns
1297                                 global $wgParser;
1298                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1299                         }
1300                 }
1301                 wfProfileOut( __METHOD__ );
1302                 return $text;
1303         }
1304
1305         /**
1306          * @deprecated use Article::doEdit()
1307          */
1308         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1309                 wfDeprecated( __METHOD__ );
1310                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1311                         ( $isminor ? EDIT_MINOR : 0 ) |
1312                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1313                         ( $bot ? EDIT_FORCE_BOT : 0 );
1314
1315                 # If this is a comment, add the summary as headline
1316                 if( $comment && $summary != "" ) {
1317                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1318                 }
1319
1320                 $this->doEdit( $text, $summary, $flags );
1321
1322                 $dbw = wfGetDB( DB_MASTER );
1323                 if($watchthis) {
1324                         if(!$this->mTitle->userIsWatching()) {
1325                                 $dbw->begin();
1326                                 $this->doWatch();
1327                                 $dbw->commit();
1328                         }
1329                 } else {
1330                         if( $this->mTitle->userIsWatching() ) {
1331                                 $dbw->begin();
1332                                 $this->doUnwatch();
1333                                 $dbw->commit();
1334                         }
1335                 }
1336                 $this->doRedirect( $this->isRedirect( $text ) );
1337         }
1338
1339         /**
1340          * @deprecated use Article::doEdit()
1341          */
1342         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1343                 wfDeprecated( __METHOD__ );
1344                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1345                         ( $minor ? EDIT_MINOR : 0 ) |
1346                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1347
1348                 $status = $this->doEdit( $text, $summary, $flags );
1349                 if( !$status->isOK() ) {
1350                         return false;
1351                 }
1352
1353                 $dbw = wfGetDB( DB_MASTER );
1354                 if( $watchthis ) {
1355                         if(!$this->mTitle->userIsWatching()) {
1356                                 $dbw->begin();
1357                                 $this->doWatch();
1358                                 $dbw->commit();
1359                         }
1360                 } else {
1361                         if( $this->mTitle->userIsWatching() ) {
1362                                 $dbw->begin();
1363                                 $this->doUnwatch();
1364                                 $dbw->commit();
1365                         }
1366                 }
1367
1368                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1369                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1370
1371                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1372                 return true;
1373         }
1374
1375         /**
1376          * Article::doEdit()
1377          *
1378          * Change an existing article or create a new article. Updates RC and all necessary caches,
1379          * optionally via the deferred update array.
1380          *
1381          * $wgUser must be set before calling this function.
1382          *
1383          * @param $text String: new text
1384          * @param $summary String: edit summary
1385          * @param $flags Integer bitfield:
1386          *      EDIT_NEW
1387          *          Article is known or assumed to be non-existent, create a new one
1388          *      EDIT_UPDATE
1389          *          Article is known or assumed to be pre-existing, update it
1390          *      EDIT_MINOR
1391          *          Mark this edit minor, if the user is allowed to do so
1392          *      EDIT_SUPPRESS_RC
1393          *          Do not log the change in recentchanges
1394          *      EDIT_FORCE_BOT
1395          *          Mark the edit a "bot" edit regardless of user rights
1396          *      EDIT_DEFER_UPDATES
1397          *          Defer some of the updates until the end of index.php
1398          *      EDIT_AUTOSUMMARY
1399          *          Fill in blank summaries with generated text where possible
1400          *
1401          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1402          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1403          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1404          * edit-already-exists error will be returned. These two conditions are also possible with
1405          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1406          *
1407          * @param $baseRevId the revision ID this edit was based off, if any
1408          * @param $user Optional user object, $wgUser will be used if not passed
1409          *
1410          * @return Status object. Possible errors:
1411          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1412          *     edit-gone-missing:       In update mode, but the article didn't exist
1413          *     edit-conflict:           In update mode, the article changed unexpectedly
1414          *     edit-no-change:          Warning that the text was the same as before
1415          *     edit-already-exists:     In creation mode, but the article already exists
1416          *
1417          *  Extensions may define additional errors.
1418          *
1419          *  $return->value will contain an associative array with members as follows:
1420          *     new:                     Boolean indicating if the function attempted to create a new article
1421          *     revision:                The revision object for the inserted revision, or null
1422          *
1423          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1424          */
1425         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1426                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1427
1428                 # Low-level sanity check
1429                 if( $this->mTitle->getText() == '' ) {
1430                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1431                 }
1432
1433                 wfProfileIn( __METHOD__ );
1434
1435                 $user = is_null($user) ? $wgUser : $user;
1436                 $status = Status::newGood( array() );
1437
1438                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1439                 $this->loadPageData();
1440
1441                 if( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1442                         $aid = $this->mTitle->getArticleID();
1443                         if( $aid ) {
1444                                 $flags |= EDIT_UPDATE;
1445                         } else {
1446                                 $flags |= EDIT_NEW;
1447                         }
1448                 }
1449
1450                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1451                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1452                 {
1453                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1454                         wfProfileOut( __METHOD__ );
1455                         if( $status->isOK() ) {
1456                                 $status->fatal( 'edit-hook-aborted');
1457                         }
1458                         return $status;
1459                 }
1460
1461                 # Silently ignore EDIT_MINOR if not allowed
1462                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed('minoredit');
1463                 $bot = $flags & EDIT_FORCE_BOT;
1464
1465                 $oldtext = $this->getContent();
1466                 $oldsize = strlen( $oldtext );
1467
1468                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1469                 if( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1470                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1471                 }
1472
1473                 $editInfo = $this->prepareTextForEdit( $text );
1474                 $text = $editInfo->pst;
1475                 $newsize = strlen( $text );
1476
1477                 $dbw = wfGetDB( DB_MASTER );
1478                 $now = wfTimestampNow();
1479
1480                 if( $flags & EDIT_UPDATE ) {
1481                         # Update article, but only if changed.
1482                         $status->value['new'] = false;
1483                         # Make sure the revision is either completely inserted or not inserted at all
1484                         if( !$wgDBtransactions ) {
1485                                 $userAbort = ignore_user_abort( true );
1486                         }
1487
1488                         $revisionId = 0;
1489
1490                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1491
1492                         if( $changed ) {
1493                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1494                                   - (int)$this->isCountable( $oldtext );
1495                                 $this->mTotalAdjustment = 0;
1496
1497                                 if( !$this->mLatest ) {
1498                                         # Article gone missing
1499                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1500                                         $status->fatal( 'edit-gone-missing' );
1501                                         wfProfileOut( __METHOD__ );
1502                                         return $status;
1503                                 }
1504
1505                                 $revision = new Revision( array(
1506                                         'page'       => $this->getId(),
1507                                         'comment'    => $summary,
1508                                         'minor_edit' => $isminor,
1509                                         'text'       => $text,
1510                                         'parent_id'  => $this->mLatest,
1511                                         'user'       => $user->getId(),
1512                                         'user_text'  => $user->getName(),
1513                                         ) );
1514
1515                                 $dbw->begin();
1516                                 $revisionId = $revision->insertOn( $dbw );
1517
1518                                 # Update page
1519                                 #
1520                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1521                                 # during the course of this function. This makes sure that EditPage can detect
1522                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1523                                 # before this function is called. A previous function used a separate query, this
1524                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1525                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1526
1527                                 if( !$ok ) {
1528                                         /* Belated edit conflict! Run away!! */
1529                                         $status->fatal( 'edit-conflict' );
1530                                         # Delete the invalid revision if the DB is not transactional
1531                                         if( !$wgDBtransactions ) {
1532                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1533                                         }
1534                                         $revisionId = 0;
1535                                         $dbw->rollback();
1536                                 } else {
1537                                         global $wgUseRCPatrol;
1538                                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, $baseRevId, $user) );
1539                                         # Update recentchanges
1540                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1541                                                 # Mark as patrolled if the user can do so
1542                                                 $patrolled = $wgUseRCPatrol && $user->isAllowed('autopatrol');
1543                                                 # Add RC row to the DB
1544                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1545                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1546                                                         $revisionId, $patrolled
1547                                                 );
1548                                                 # Log auto-patrolled edits
1549                                                 if( $patrolled ) {
1550                                                         PatrolLog::record( $rc, true );
1551                                                 }
1552                                         }
1553                                         $user->incEditCount();
1554                                         $dbw->commit();
1555                                 }
1556                         } else {
1557                                 $status->warning( 'edit-no-change' );
1558                                 $revision = null;
1559                                 // Keep the same revision ID, but do some updates on it
1560                                 $revisionId = $this->getRevIdFetched();
1561                                 // Update page_touched, this is usually implicit in the page update
1562                                 // Other cache updates are done in onArticleEdit()
1563                                 $this->mTitle->invalidateCache();
1564                         }
1565
1566                         if( !$wgDBtransactions ) {
1567                                 ignore_user_abort( $userAbort );
1568                         }
1569                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1570                         if( !$status->isOK() ) {
1571                                 wfProfileOut( __METHOD__ );
1572                                 return $status;
1573                         }
1574
1575                         # Invalidate cache of this article and all pages using this article
1576                         # as a template. Partly deferred. Leave templatelinks for editUpdates().
1577                         Article::onArticleEdit( $this->mTitle, 'skiptransclusions' );
1578                         # Update links tables, site stats, etc.
1579                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1580                 } else {
1581                         # Create new article
1582                         $status->value['new'] = true;
1583
1584                         # Set statistics members
1585                         # We work out if it's countable after PST to avoid counter drift
1586                         # when articles are created with {{subst:}}
1587                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1588                         $this->mTotalAdjustment = 1;
1589
1590                         $dbw->begin();
1591
1592                         # Add the page record; stake our claim on this title!
1593                         # This will return false if the article already exists
1594                         $newid = $this->insertOn( $dbw );
1595
1596                         if( $newid === false ) {
1597                                 $dbw->rollback();
1598                                 $status->fatal( 'edit-already-exists' );
1599                                 wfProfileOut( __METHOD__ );
1600                                 return $status;
1601                         }
1602
1603                         # Save the revision text...
1604                         $revision = new Revision( array(
1605                                 'page'       => $newid,
1606                                 'comment'    => $summary,
1607                                 'minor_edit' => $isminor,
1608                                 'text'       => $text,
1609                                 'user'       => $user->getId(),
1610                                 'user_text'  => $user->getName(),
1611                                 ) );
1612                         $revisionId = $revision->insertOn( $dbw );
1613
1614                         $this->mTitle->resetArticleID( $newid );
1615
1616                         # Update the page record with revision data
1617                         $this->updateRevisionOn( $dbw, $revision, 0 );
1618
1619                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $user) );
1620                         # Update recentchanges
1621                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1622                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1623                                 # Mark as patrolled if the user can do so
1624                                 $patrolled = ($wgUseRCPatrol || $wgUseNPPatrol) && $user->isAllowed('autopatrol');
1625                                 # Add RC row to the DB
1626                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1627                                         '', strlen($text), $revisionId, $patrolled );
1628                                 # Log auto-patrolled edits
1629                                 if( $patrolled ) {
1630                                         PatrolLog::record( $rc, true );
1631                                 }
1632                         }
1633                         $user->incEditCount();
1634                         $dbw->commit();
1635
1636                         # Update links, etc.
1637                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1638
1639                         # Clear caches
1640                         Article::onArticleCreate( $this->mTitle );
1641
1642                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1643                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1644                 }
1645
1646                 # Do updates right now unless deferral was requested
1647                 if( !( $flags & EDIT_DEFER_UPDATES ) ) {
1648                         wfDoUpdates();
1649                 }
1650
1651                 // Return the new revision (or null) to the caller
1652                 $status->value['revision'] = $revision;
1653
1654                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1655                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status ) );
1656
1657                 wfProfileOut( __METHOD__ );
1658                 return $status;
1659         }
1660
1661         /**
1662          * @deprecated wrapper for doRedirect
1663          */
1664         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1665                 wfDeprecated( __METHOD__ );
1666                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1667         }
1668
1669         /**
1670          * Output a redirect back to the article.
1671          * This is typically used after an edit.
1672          *
1673          * @param $noRedir Boolean: add redirect=no
1674          * @param $sectionAnchor String: section to redirect to, including "#"
1675          * @param $extraQuery String: extra query params
1676          */
1677         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1678                 global $wgOut;
1679                 if( $noRedir ) {
1680                         $query = 'redirect=no';
1681                         if( $extraQuery )
1682                                 $query .= "&$query";
1683                 } else {
1684                         $query = $extraQuery;
1685                 }
1686                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1687         }
1688
1689         /**
1690          * Mark this particular edit/page as patrolled
1691          */
1692         public function markpatrolled() {
1693                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
1694                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1695
1696                 # If we haven't been given an rc_id value, we can't do anything
1697                 $rcid = (int) $wgRequest->getVal('rcid');
1698                 $rc = RecentChange::newFromId($rcid);
1699                 if( is_null($rc) ) {
1700                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1701                         return;
1702                 }
1703
1704                 #It would be nice to see where the user had actually come from, but for now just guess
1705                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
1706                 $return = Title::makeTitle( NS_SPECIAL, $returnto );
1707
1708                 $dbw = wfGetDB( DB_MASTER );
1709                 $errors = $rc->doMarkPatrolled();
1710
1711                 if( in_array(array('rcpatroldisabled'), $errors) ) {
1712                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1713                         return;
1714                 }
1715
1716                 if( in_array(array('hookaborted'), $errors) ) {
1717                         // The hook itself has handled any output
1718                         return;
1719                 }
1720
1721                 if( in_array(array('markedaspatrollederror-noautopatrol'), $errors) ) {
1722                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1723                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
1724                         $wgOut->returnToMain( false, $return );
1725                         return;
1726                 }
1727
1728                 if( !empty($errors) ) {
1729                         $wgOut->showPermissionsErrorPage( $errors );
1730                         return;
1731                 }
1732
1733                 # Inform the user
1734                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1735                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
1736                 $wgOut->returnToMain( false, $return );
1737         }
1738
1739         /**
1740          * User-interface handler for the "watch" action
1741          */
1742
1743         public function watch() {
1744                 global $wgUser, $wgOut;
1745                 if( $wgUser->isAnon() ) {
1746                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1747                         return;
1748                 }
1749                 if( wfReadOnly() ) {
1750                         $wgOut->readOnlyPage();
1751                         return;
1752                 }
1753                 if( $this->doWatch() ) {
1754                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1755                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1756                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
1757                 }
1758                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1759         }
1760
1761         /**
1762          * Add this page to $wgUser's watchlist
1763          * @return bool true on successful watch operation
1764          */
1765         public function doWatch() {
1766                 global $wgUser;
1767                 if( $wgUser->isAnon() ) {
1768                         return false;
1769                 }
1770                 if( wfRunHooks('WatchArticle', array(&$wgUser, &$this)) ) {
1771                         $wgUser->addWatch( $this->mTitle );
1772                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1773                 }
1774                 return false;
1775         }
1776
1777         /**
1778          * User interface handler for the "unwatch" action.
1779          */
1780         public function unwatch() {
1781                 global $wgUser, $wgOut;
1782                 if( $wgUser->isAnon() ) {
1783                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1784                         return;
1785                 }
1786                 if( wfReadOnly() ) {
1787                         $wgOut->readOnlyPage();
1788                         return;
1789                 }
1790                 if( $this->doUnwatch() ) {
1791                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1792                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1793                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
1794                 }
1795                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1796         }
1797
1798         /**
1799          * Stop watching a page
1800          * @return bool true on successful unwatch
1801          */
1802         public function doUnwatch() {
1803                 global $wgUser;
1804                 if( $wgUser->isAnon() ) {
1805                         return false;
1806                 }
1807                 if( wfRunHooks('UnwatchArticle', array(&$wgUser, &$this)) ) {
1808                         $wgUser->removeWatch( $this->mTitle );
1809                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1810                 }
1811                 return false;
1812         }
1813
1814         /**
1815          * action=protect handler
1816          */
1817         public function protect() {
1818                 $form = new ProtectionForm( $this );
1819                 $form->execute();
1820         }
1821
1822         /**
1823          * action=unprotect handler (alias)
1824          */
1825         public function unprotect() {
1826                 $this->protect();
1827         }
1828
1829         /**
1830          * Update the article's restriction field, and leave a log entry.
1831          *
1832          * @param $limit Array: set of restriction keys
1833          * @param $reason String
1834          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1835          * @param $expiry Array: per restriction type expiration
1836          * @return bool true on success
1837          */
1838         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
1839                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1840
1841                 $id = $this->mTitle->getArticleID();
1842                 if( $id <= 0 || wfReadOnly() || !$this->mTitle->userCan('protect') ) {
1843                         return false;
1844                 }
1845
1846                 if( !$cascade ) {
1847                         $cascade = false;
1848                 }
1849
1850                 // Take this opportunity to purge out expired restrictions
1851                 Title::purgeExpiredRestrictions();
1852
1853                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1854                 # we expect a single selection, but the schema allows otherwise.
1855                 $current = array();
1856                 $updated = Article::flattenRestrictions( $limit );
1857                 $changed = false;
1858                 foreach( $wgRestrictionTypes as $action ) {
1859                         if( isset( $expiry[$action] ) ) {
1860                                 $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1861                                 $changed = ($changed || ($this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action]) );
1862                         }
1863                 }
1864
1865                 $current = Article::flattenRestrictions( $current );
1866
1867                 $changed = ($changed || ( $current != $updated ) );
1868                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
1869                 $protect = ( $updated != '' );
1870
1871                 # If nothing's changed, do nothing
1872                 if( $changed ) {
1873                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1874
1875                                 $dbw = wfGetDB( DB_MASTER );
1876
1877                                 # Prepare a null revision to be added to the history
1878                                 $modified = $current != '' && $protect;
1879                                 if( $protect ) {
1880                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1881                                 } else {
1882                                         $comment_type = 'unprotectedarticle';
1883                                 }
1884                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1885
1886                                 # Only restrictions with the 'protect' right can cascade...
1887                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1888                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1889                                 # The schema allows multiple restrictions
1890                                 if(!in_array('protect', $editrestriction) && !in_array('sysop', $editrestriction))
1891                                         $cascade = false;
1892                                 $cascade_description = '';
1893                                 if( $cascade ) {
1894                                         $cascade_description = ' ['.wfMsgForContent('protect-summary-cascade').']';
1895                                 }
1896
1897                                 if( $reason )
1898                                         $comment .= ": $reason";
1899
1900                                 $editComment = $comment;
1901                                 $encodedExpiry = array();
1902                                 $protect_description = '';
1903                                 foreach( $limit as $action => $restrictions  ) {
1904                                         $encodedExpiry[$action] = Block::encodeExpiry($expiry[$action], $dbw );
1905                                         if( $restrictions != '' ) {
1906                                                 $protect_description .= "[$action=$restrictions] (";
1907                                                 if( $encodedExpiry[$action] != 'infinity' ) {
1908                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
1909                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) );
1910                                                 } else {
1911                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
1912                                                 }
1913                                                 $protect_description .= ') ';
1914                                         }
1915                                 }
1916                                 $protect_description = trim($protect_description);
1917
1918                                 if( $protect_description && $protect )
1919                                         $editComment .= " ($protect_description)";
1920                                 if( $cascade )
1921                                         $editComment .= "$cascade_description";
1922                                 # Update restrictions table
1923                                 foreach( $limit as $action => $restrictions ) {
1924                                         if($restrictions != '' ) {
1925                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
1926                                                         array( 'pr_page' => $id,
1927                                                                 'pr_type' => $action,
1928                                                                 'pr_level' => $restrictions,
1929                                                                 'pr_cascade' => ($cascade && $action == 'edit') ? 1 : 0,
1930                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
1931                                         } else {
1932                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1933                                                         'pr_type' => $action ), __METHOD__ );
1934                                         }
1935                                 }
1936
1937                                 # Insert a null revision
1938                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1939                                 $nullRevId = $nullRevision->insertOn( $dbw );
1940
1941                                 $latest = $this->getLatest();
1942                                 # Update page record
1943                                 $dbw->update( 'page',
1944                                         array( /* SET */
1945                                                 'page_touched' => $dbw->timestamp(),
1946                                                 'page_restrictions' => '',
1947                                                 'page_latest' => $nullRevId
1948                                         ), array( /* WHERE */
1949                                                 'page_id' => $id
1950                                         ), 'Article::protect'
1951                                 );
1952
1953                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $nullRevision, $latest, $wgUser) );
1954                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1955
1956                                 # Update the protection log
1957                                 $log = new LogPage( 'protect' );
1958                                 if( $protect ) {
1959                                         $params = array($protect_description,$cascade ? 'cascade' : '');
1960                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason), $params );
1961                                 } else {
1962                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1963                                 }
1964
1965                         } # End hook
1966                 } # End "changed" check
1967
1968                 return true;
1969         }
1970
1971         /**
1972          * Take an array of page restrictions and flatten it to a string
1973          * suitable for insertion into the page_restrictions field.
1974          * @param $limit Array
1975          * @return String
1976          */
1977         protected static function flattenRestrictions( $limit ) {
1978                 if( !is_array( $limit ) ) {
1979                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
1980                 }
1981                 $bits = array();
1982                 ksort( $limit );
1983                 foreach( $limit as $action => $restrictions ) {
1984                         if( $restrictions != '' ) {
1985                                 $bits[] = "$action=$restrictions";
1986                         }
1987                 }
1988                 return implode( ':', $bits );
1989         }
1990
1991         /**
1992          * Auto-generates a deletion reason
1993          * @param &$hasHistory Boolean: whether the page has a history
1994          */
1995         public function generateReason( &$hasHistory ) {
1996                 global $wgContLang;
1997                 $dbw = wfGetDB( DB_MASTER );
1998                 // Get the last revision
1999                 $rev = Revision::newFromTitle( $this->mTitle );
2000                 if( is_null( $rev ) )
2001                         return false;
2002
2003                 // Get the article's contents
2004                 $contents = $rev->getText();
2005                 $blank = false;
2006                 // If the page is blank, use the text from the previous revision,
2007                 // which can only be blank if there's a move/import/protect dummy revision involved
2008                 if( $contents == '' ) {
2009                         $prev = $rev->getPrevious();
2010                         if( $prev )     {
2011                                 $contents = $prev->getText();
2012                                 $blank = true;
2013                         }
2014                 }
2015
2016                 // Find out if there was only one contributor
2017                 // Only scan the last 20 revisions
2018                 $limit = 20;
2019                 $res = $dbw->select( 'revision', 'rev_user_text',
2020                         array( 'rev_page' => $this->getID() ), __METHOD__,
2021                         array( 'LIMIT' => $limit )
2022                 );
2023                 if( $res === false )
2024                         // This page has no revisions, which is very weird
2025                         return false;
2026                 if( $res->numRows() > 1 )
2027                                 $hasHistory = true;
2028                 else
2029                                 $hasHistory = false;
2030                 $row = $dbw->fetchObject( $res );
2031                 $onlyAuthor = $row->rev_user_text;
2032                 // Try to find a second contributor
2033                 foreach( $res as $row ) {
2034                         if( $row->rev_user_text != $onlyAuthor ) {
2035                                 $onlyAuthor = false;
2036                                 break;
2037                         }
2038                 }
2039                 $dbw->freeResult( $res );
2040
2041                 // Generate the summary with a '$1' placeholder
2042                 if( $blank ) {
2043                         // The current revision is blank and the one before is also
2044                         // blank. It's just not our lucky day
2045                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2046                 } else {
2047                         if( $onlyAuthor )
2048                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2049                         else
2050                                 $reason = wfMsgForContent( 'excontent', '$1' );
2051                 }
2052
2053                 if( $reason == '-' ) {
2054                         // Allow these UI messages to be blanked out cleanly
2055                         return '';
2056                 }
2057
2058                 // Replace newlines with spaces to prevent uglyness
2059                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2060                 // Calculate the maximum amount of chars to get
2061                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2062                 $maxLength = 255 - (strlen( $reason ) - 2) - 3;
2063                 $contents = $wgContLang->truncate( $contents, $maxLength, '...' );
2064                 // Remove possible unfinished links
2065                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2066                 // Now replace the '$1' placeholder
2067                 $reason = str_replace( '$1', $contents, $reason );
2068                 return $reason;
2069         }
2070
2071
2072         /*
2073          * UI entry point for page deletion
2074          */
2075         public function delete() {
2076                 global $wgUser, $wgOut, $wgRequest;
2077
2078                 $confirm = $wgRequest->wasPosted() &&
2079                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2080
2081                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2082                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2083
2084                 $reason = $this->DeleteReasonList;
2085
2086                 if( $reason != 'other' && $this->DeleteReason != '') {
2087                         // Entry from drop down menu + additional comment
2088                         $reason .= ': ' . $this->DeleteReason;
2089                 } elseif( $reason == 'other' ) {
2090                         $reason = $this->DeleteReason;
2091                 }
2092                 # Flag to hide all contents of the archived revisions
2093                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed('suppressrevision');
2094
2095                 # This code desperately needs to be totally rewritten
2096
2097                 # Read-only check...
2098                 if( wfReadOnly() ) {
2099                         $wgOut->readOnlyPage();
2100                         return;
2101                 }
2102
2103                 # Check permissions
2104                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2105
2106                 if(count($permission_errors)>0) {
2107                         $wgOut->showPermissionsErrorPage( $permission_errors );
2108                         return;
2109                 }
2110
2111                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2112
2113                 # Better double-check that it hasn't been deleted yet!
2114                 $dbw = wfGetDB( DB_MASTER );
2115                 $conds = $this->mTitle->pageCond();
2116                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2117                 if( $latest === false ) {
2118                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
2119                         return;
2120                 }
2121
2122                 # Hack for big sites
2123                 $bigHistory = $this->isBigDeletion();
2124                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2125                         global $wgLang, $wgDeleteRevisionsLimit;
2126                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2127                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2128                         return;
2129                 }
2130
2131                 if( $confirm ) {
2132                         $this->doDelete( $reason, $suppress );
2133                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2134                                 $this->doWatch();
2135                         } elseif( $this->mTitle->userIsWatching() ) {
2136                                 $this->doUnwatch();
2137                         }
2138                         return;
2139                 }
2140
2141                 // Generate deletion reason
2142                 $hasHistory = false;
2143                 if( !$reason ) $reason = $this->generateReason($hasHistory);
2144
2145                 // If the page has a history, insert a warning
2146                 if( $hasHistory && !$confirm ) {
2147                         $skin=$wgUser->getSkin();
2148                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
2149                         if( $bigHistory ) {
2150                                 global $wgLang, $wgDeleteRevisionsLimit;
2151                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2152                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2153                         }
2154                 }
2155
2156                 return $this->confirmDelete( $reason );
2157         }
2158
2159         /**
2160          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2161          */
2162         public function isBigDeletion() {
2163                 global $wgDeleteRevisionsLimit;
2164                 if( $wgDeleteRevisionsLimit ) {
2165                         $revCount = $this->estimateRevisionCount();
2166                         return $revCount > $wgDeleteRevisionsLimit;
2167                 }
2168                 return false;
2169         }
2170
2171         /**
2172          * @return int approximate revision count
2173          */
2174         public function estimateRevisionCount() {
2175                 $dbr = wfGetDB( DB_SLAVE );
2176                 // For an exact count...
2177                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2178                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2179                 return $dbr->estimateRowCount( 'revision', '*',
2180                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2181         }
2182
2183         /**
2184          * Get the last N authors
2185          * @param $num Integer: number of revisions to get
2186          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2187          * @return array Array of authors, duplicates not removed
2188          */
2189         public function getLastNAuthors( $num, $revLatest = 0 ) {
2190                 wfProfileIn( __METHOD__ );
2191                 // First try the slave
2192                 // If that doesn't have the latest revision, try the master
2193                 $continue = 2;
2194                 $db = wfGetDB( DB_SLAVE );
2195                 do {
2196                         $res = $db->select( array( 'page', 'revision' ),
2197                                 array( 'rev_id', 'rev_user_text' ),
2198                                 array(
2199                                         'page_namespace' => $this->mTitle->getNamespace(),
2200                                         'page_title' => $this->mTitle->getDBkey(),
2201                                         'rev_page = page_id'
2202                                 ), __METHOD__, $this->getSelectOptions( array(
2203                                         'ORDER BY' => 'rev_timestamp DESC',
2204                                         'LIMIT' => $num
2205                                 ) )
2206                         );
2207                         if( !$res ) {
2208                                 wfProfileOut( __METHOD__ );
2209                                 return array();
2210                         }
2211                         $row = $db->fetchObject( $res );
2212                         if( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2213                                 $db = wfGetDB( DB_MASTER );
2214                                 $continue--;
2215                         } else {
2216                                 $continue = 0;
2217                         }
2218                 } while ( $continue );
2219
2220                 $authors = array( $row->rev_user_text );
2221                 while ( $row = $db->fetchObject( $res ) ) {
2222                         $authors[] = $row->rev_user_text;
2223                 }
2224                 wfProfileOut( __METHOD__ );
2225                 return $authors;
2226         }
2227
2228         /**
2229          * Output deletion confirmation dialog
2230          * @param $reason String: prefilled reason
2231          */
2232         public function confirmDelete( $reason ) {
2233                 global $wgOut, $wgUser;
2234
2235                 wfDebug( "Article::confirmDelete\n" );
2236
2237                 $wgOut->setSubtitle( wfMsg( 'delete-backlink', $wgUser->getSkin()->makeKnownLinkObj( $this->mTitle ) ) );
2238                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2239                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2240
2241                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
2242                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2243                                         <td></td>
2244                                         <td class='mw-input'>" .
2245                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2246                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2247                                         "</td>
2248                                 </tr>";
2249                 } else {
2250                         $suppress = '';
2251                 }
2252                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2253
2254                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2255                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2256                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2257                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2258                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2259                         "<tr id=\"wpDeleteReasonListRow\">
2260                                 <td class='mw-label'>" .
2261                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2262                                 "</td>
2263                                 <td class='mw-input'>" .
2264                                         Xml::listDropDown( 'wpDeleteReasonList',
2265                                                 wfMsgForContent( 'deletereason-dropdown' ),
2266                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2267                                 "</td>
2268                         </tr>
2269                         <tr id=\"wpDeleteReasonRow\">
2270                                 <td class='mw-label'>" .
2271                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2272                                 "</td>
2273                                 <td class='mw-input'>" .
2274                                         Xml::input( 'wpReason', 60, $reason, array( 'type' => 'text', 'maxlength' => '255',
2275                                                 'tabindex' => '2', 'id' => 'wpReason' ) ) .
2276                                 "</td>
2277                         </tr>
2278                         <tr>
2279                                 <td></td>
2280                                 <td class='mw-input'>" .
2281                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2282                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2283                                 "</td>
2284                         </tr>
2285                         $suppress
2286                         <tr>
2287                                 <td></td>
2288                                 <td class='mw-submit'>" .
2289                                         Xml::submitButton( wfMsg( 'deletepage' ),
2290                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2291                                 "</td>
2292                         </tr>" .
2293                         Xml::closeElement( 'table' ) .
2294                         Xml::closeElement( 'fieldset' ) .
2295                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2296                         Xml::closeElement( 'form' );
2297
2298                         if( $wgUser->isAllowed( 'editinterface' ) ) {
2299                                 $skin = $wgUser->getSkin();
2300                                 $link = $skin->makeLink ( 'MediaWiki:Deletereason-dropdown', wfMsgHtml( 'delete-edit-reasonlist' ) );
2301                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2302                         }
2303
2304                 $wgOut->addHTML( $form );
2305                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2306         }
2307
2308         /**
2309          * Perform a deletion and output success or failure messages
2310          */
2311         public function doDelete( $reason, $suppress = false ) {
2312                 global $wgOut, $wgUser;
2313                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2314
2315                 $error = '';
2316                 if( wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason, &$error)) ) {
2317                         if( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2318                                 $deleted = $this->mTitle->getPrefixedText();
2319
2320                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2321                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2322
2323                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2324
2325                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2326                                 $wgOut->returnToMain( false );
2327                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason, $id));
2328                         } else {
2329                                 if( $error == '' )
2330                                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
2331                                 else
2332                                         $wgOut->showFatalError( $error );
2333                         }
2334                 }
2335         }
2336
2337         /**
2338          * Back-end article deletion
2339          * Deletes the article with database consistency, writes logs, purges caches
2340          * Returns success
2341          */
2342         public function doDeleteArticle( $reason, $suppress = false, $id = 0 ) {
2343                 global $wgUseSquid, $wgDeferredUpdateList;
2344                 global $wgUseTrackbacks;
2345
2346                 wfDebug( __METHOD__."\n" );
2347
2348                 $dbw = wfGetDB( DB_MASTER );
2349                 $ns = $this->mTitle->getNamespace();
2350                 $t = $this->mTitle->getDBkey();
2351                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2352
2353                 if( $t == '' || $id == 0 ) {
2354                         return false;
2355                 }
2356
2357                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
2358                 array_push( $wgDeferredUpdateList, $u );
2359
2360                 // Bitfields to further suppress the content
2361                 if( $suppress ) {
2362                         $bitfield = 0;
2363                         // This should be 15...
2364                         $bitfield |= Revision::DELETED_TEXT;
2365                         $bitfield |= Revision::DELETED_COMMENT;
2366                         $bitfield |= Revision::DELETED_USER;
2367                         $bitfield |= Revision::DELETED_RESTRICTED;
2368                 } else {
2369                         $bitfield = 'rev_deleted';
2370                 }
2371
2372                 $dbw->begin();
2373                 // For now, shunt the revision data into the archive table.
2374                 // Text is *not* removed from the text table; bulk storage
2375                 // is left intact to avoid breaking block-compression or
2376                 // immutable storage schemes.
2377                 //
2378                 // For backwards compatibility, note that some older archive
2379                 // table entries will have ar_text and ar_flags fields still.
2380                 //
2381                 // In the future, we may keep revisions and mark them with
2382                 // the rev_deleted field, which is reserved for this purpose.
2383                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2384                         array(
2385                                 'ar_namespace'  => 'page_namespace',
2386                                 'ar_title'      => 'page_title',
2387                                 'ar_comment'    => 'rev_comment',
2388                                 'ar_user'       => 'rev_user',
2389                                 'ar_user_text'  => 'rev_user_text',
2390                                 'ar_timestamp'  => 'rev_timestamp',
2391                                 'ar_minor_edit' => 'rev_minor_edit',
2392                                 'ar_rev_id'     => 'rev_id',
2393                                 'ar_text_id'    => 'rev_text_id',
2394                                 'ar_text'       => '\'\'', // Be explicit to appease
2395                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2396                                 'ar_len'        => 'rev_len',
2397                                 'ar_page_id'    => 'page_id',
2398                                 'ar_deleted'    => $bitfield
2399                         ), array(
2400                                 'page_id' => $id,
2401                                 'page_id = rev_page'
2402                         ), __METHOD__
2403                 );
2404
2405                 # Delete restrictions for it
2406                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2407
2408                 # Now that it's safely backed up, delete it
2409                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2410                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2411                 if( !$ok ) {
2412                         $dbw->rollback();
2413                         return false;
2414                 }
2415
2416                 # If using cascading deletes, we can skip some explicit deletes
2417                 if( !$dbw->cascadingDeletes() ) {
2418                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2419
2420                         if($wgUseTrackbacks)
2421                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2422
2423                         # Delete outgoing links
2424                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2425                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2426                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2427                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2428                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2429                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2430                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2431                 }
2432
2433                 # If using cleanup triggers, we can skip some manual deletes
2434                 if( !$dbw->cleanupTriggers() ) {
2435                         # Clean up recentchanges entries...
2436                         $dbw->delete( 'recentchanges',
2437                                 array( 'rc_type != '.RC_LOG,
2438                                         'rc_namespace' => $this->mTitle->getNamespace(),
2439                                         'rc_title' => $this->mTitle->getDBKey() ),
2440                                 __METHOD__ );
2441                         $dbw->delete( 'recentchanges',
2442                                 array( 'rc_type != '.RC_LOG, 'rc_cur_id' => $id ),
2443                                 __METHOD__ );
2444                 }
2445
2446                 # Clear caches
2447                 Article::onArticleDelete( $this->mTitle );
2448
2449                 # Fix category table counts
2450                 $cats = array();
2451                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2452                 foreach( $res as $row ) {
2453                         $cats []= $row->cl_to;
2454                 }
2455                 $this->updateCategoryCounts( array(), $cats );
2456
2457                 # Clear the cached article id so the interface doesn't act like we exist
2458                 $this->mTitle->resetArticleID( 0 );
2459                 $this->mTitle->mArticleID = 0;
2460
2461                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2462                 $logtype = $suppress ? 'suppress' : 'delete';
2463                 $log = new LogPage( $logtype );
2464
2465                 # Make sure logging got through
2466                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2467
2468                 $dbw->commit();
2469
2470                 return true;
2471         }
2472
2473         /**
2474          * Roll back the most recent consecutive set of edits to a page
2475          * from the same user; fails if there are no eligible edits to
2476          * roll back to, e.g. user is the sole contributor. This function
2477          * performs permissions checks on $wgUser, then calls commitRollback()
2478          * to do the dirty work
2479          *
2480          * @param $fromP String: Name of the user whose edits to rollback.
2481          * @param $summary String: Custom summary. Set to default summary if empty.
2482          * @param $token String: Rollback token.
2483          * @param $bot Boolean: If true, mark all reverted edits as bot.
2484          *
2485          * @param $resultDetails Array: contains result-specific array of additional values
2486          *    'alreadyrolled' : 'current' (rev)
2487          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2488          *
2489          * @return array of errors, each error formatted as
2490          *   array(messagekey, param1, param2, ...).
2491          * On success, the array is empty.  This array can also be passed to
2492          * OutputPage::showPermissionsErrorPage().
2493          */
2494         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2495                 global $wgUser;
2496                 $resultDetails = null;
2497
2498                 # Check permissions
2499                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
2500                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
2501                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2502
2503                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2504                         $errors[] = array( 'sessionfailure' );
2505
2506                 if( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
2507                         $errors[] = array( 'actionthrottledtext' );
2508                 }
2509                 # If there were errors, bail out now
2510                 if( !empty( $errors ) )
2511                         return $errors;
2512
2513                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
2514         }
2515
2516         /**
2517          * Backend implementation of doRollback(), please refer there for parameter
2518          * and return value documentation
2519          *
2520          * NOTE: This function does NOT check ANY permissions, it just commits the
2521          * rollback to the DB Therefore, you should only call this function direct-
2522          * ly if you want to use custom permissions checks. If you don't, use
2523          * doRollback() instead.
2524          */
2525         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
2526                 global $wgUseRCPatrol, $wgUser, $wgLang;
2527                 $dbw = wfGetDB( DB_MASTER );
2528
2529                 if( wfReadOnly() ) {
2530                         return array( array( 'readonlytext' ) );
2531                 }
2532
2533                 # Get the last editor
2534                 $current = Revision::newFromTitle( $this->mTitle );
2535                 if( is_null( $current ) ) {
2536                         # Something wrong... no page?
2537                         return array(array('notanarticle'));
2538                 }
2539
2540                 $from = str_replace( '_', ' ', $fromP );
2541                 if( $from != $current->getUserText() ) {
2542                         $resultDetails = array( 'current' => $current );
2543                         return array(array('alreadyrolled',
2544                                 htmlspecialchars($this->mTitle->getPrefixedText()),
2545                                 htmlspecialchars($fromP),
2546                                 htmlspecialchars($current->getUserText())
2547                         ));
2548                 }
2549
2550                 # Get the last edit not by this guy
2551                 $user = intval( $current->getUser() );
2552                 $user_text = $dbw->addQuotes( $current->getUserText() );
2553                 $s = $dbw->selectRow( 'revision',
2554                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2555                         array(  'rev_page' => $current->getPage(),
2556                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2557                         ), __METHOD__,
2558                         array(  'USE INDEX' => 'page_timestamp',
2559                                 'ORDER BY'  => 'rev_timestamp DESC' )
2560                         );
2561                 if( $s === false ) {
2562                         # No one else ever edited this page
2563                         return array(array('cantrollback'));
2564                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
2565                         # Only admins can see this text
2566                         return array(array('notvisiblerev'));
2567                 }
2568
2569                 $set = array();
2570                 if( $bot && $wgUser->isAllowed('markbotedits') ) {
2571                         # Mark all reverted edits as bot
2572                         $set['rc_bot'] = 1;
2573                 }
2574                 if( $wgUseRCPatrol ) {
2575                         # Mark all reverted edits as patrolled
2576                         $set['rc_patrolled'] = 1;
2577                 }
2578
2579                 if( $set ) {
2580                         $dbw->update( 'recentchanges', $set,
2581                                         array( /* WHERE */
2582                                                 'rc_cur_id' => $current->getPage(),
2583                                                 'rc_user_text' => $current->getUserText(),
2584                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2585                                         ), __METHOD__
2586                                 );
2587                 }
2588
2589                 # Generate the edit summary if necessary
2590                 $target = Revision::newFromId( $s->rev_id );
2591                 if( empty( $summary ) ){
2592                         $summary = wfMsgForContent( 'revertpage' );
2593                 }
2594
2595                 # Allow the custom summary to use the same args as the default message
2596                 $args = array(
2597                         $target->getUserText(), $from, $s->rev_id,
2598                         $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
2599                         $current->getId(), $wgLang->timeanddate($current->getTimestamp())
2600                 );
2601                 $summary = wfMsgReplaceArgs( $summary, $args );
2602
2603                 # Save
2604                 $flags = EDIT_UPDATE;
2605
2606                 if( $wgUser->isAllowed('minoredit') )
2607                         $flags |= EDIT_MINOR;
2608
2609                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
2610                         $flags |= EDIT_FORCE_BOT;
2611                 # Actually store the edit
2612                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
2613                 if( !empty( $status->value['revision'] ) ) {
2614                         $revId = $status->value['revision']->getId();
2615                 } else {
2616                         $revId = false;
2617                 }
2618
2619                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target ) );
2620
2621                 $resultDetails = array(
2622                         'summary' => $summary,
2623                         'current' => $current,
2624                         'target' => $target,
2625                         'newid' => $revId
2626                 );
2627                 return array();
2628         }
2629
2630         /**
2631          * User interface for rollback operations
2632          */
2633         public function rollback() {
2634                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2635                 $details = null;
2636
2637                 $result = $this->doRollback(
2638                         $wgRequest->getVal( 'from' ),
2639                         $wgRequest->getText( 'summary' ),
2640                         $wgRequest->getVal( 'token' ),
2641                         $wgRequest->getBool( 'bot' ),
2642                         $details
2643                 );
2644
2645                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
2646                         $wgOut->rateLimited();
2647                         return;
2648                 }
2649                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
2650                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2651                         $errArray = $result[0];
2652                         $errMsg = array_shift( $errArray );
2653                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
2654                         if( isset( $details['current'] ) ){
2655                                 $current = $details['current'];
2656                                 if( $current->getComment() != '' ) {
2657                                         $wgOut->addWikiMsgArray( 'editcomment', array(
2658                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
2659                                 }
2660                         }
2661                         return;
2662                 }
2663                 # Display permissions errors before read-only message -- there's no
2664                 # point in misleading the user into thinking the inability to rollback
2665                 # is only temporary.
2666                 if( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
2667                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
2668                         # move any 'readonlytext' error manually.
2669                         $out = array();
2670                         foreach( $result as $error ) {
2671                                 if( $error != array( 'readonlytext' ) ) {
2672                                         $out []= $error;
2673                                 }
2674                         }
2675                         $wgOut->showPermissionsErrorPage( $out );
2676                         return;
2677                 }
2678                 if( $result == array( array( 'readonlytext' ) ) ) {
2679                         $wgOut->readOnlyPage();
2680                         return;
2681                 }
2682
2683                 $current = $details['current'];
2684                 $target = $details['target'];
2685                 $newId = $details['newid'];
2686                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2687                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2688                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2689                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2690                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2691                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2692                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2693                 $wgOut->returnToMain( false, $this->mTitle );
2694
2695                 if( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
2696                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
2697                         $de->showDiff( '', '' );
2698                 }
2699         }
2700
2701
2702         /**
2703          * Do standard deferred updates after page view
2704          */
2705         public function viewUpdates() {
2706                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
2707                 # Don't update page view counters on views from bot users (bug 14044)
2708                 if( !$wgDisableCounters && !$wgUser->isAllowed('bot') && $this->getID() ) {
2709                         Article::incViewCount( $this->getID() );
2710                         $u = new SiteStatsUpdate( 1, 0, 0 );
2711                         array_push( $wgDeferredUpdateList, $u );
2712                 }
2713                 # Update newtalk / watchlist notification status
2714                 $wgUser->clearNotification( $this->mTitle );
2715         }
2716
2717         /**
2718          * Prepare text which is about to be saved.
2719          * Returns a stdclass with source, pst and output members
2720          */
2721         public function prepareTextForEdit( $text, $revid=null ) {
2722                 if( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
2723                         // Already prepared
2724                         return $this->mPreparedEdit;
2725                 }
2726                 global $wgParser;
2727                 $edit = (object)array();
2728                 $edit->revid = $revid;
2729                 $edit->newText = $text;
2730                 $edit->pst = $this->preSaveTransform( $text );
2731                 $options = new ParserOptions;
2732                 $options->setTidy( true );
2733                 $options->enableLimitReport();
2734                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
2735                 $edit->oldText = $this->getContent();
2736                 $this->mPreparedEdit = $edit;
2737                 return $edit;
2738         }
2739
2740         /**
2741          * Do standard deferred updates after page edit.
2742          * Update links tables, site stats, search index and message cache.
2743          * Purges pages that include this page if the text was changed here.
2744          * Every 100th edit, prune the recent changes table.
2745          *
2746          * @private
2747          * @param $text New text of the article
2748          * @param $summary Edit summary
2749          * @param $minoredit Minor edit
2750          * @param $timestamp_of_pagechange Timestamp associated with the page change
2751          * @param $newid rev_id value of the new revision
2752          * @param $changed Whether or not the content actually changed
2753          */
2754         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2755                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
2756
2757                 wfProfileIn( __METHOD__ );
2758
2759                 # Parse the text
2760                 # Be careful not to double-PST: $text is usually already PST-ed once
2761                 if( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2762                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2763                         $editInfo = $this->prepareTextForEdit( $text, $newid );
2764                 } else {
2765                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2766                         $editInfo = $this->mPreparedEdit;
2767                 }
2768
2769                 # Save it to the parser cache
2770                 if( $wgEnableParserCache ) {
2771                         $parserCache = ParserCache::singleton();
2772                         $parserCache->save( $editInfo->output, $this, $wgUser );
2773                 }
2774
2775                 # Update the links tables
2776                 $u = new LinksUpdate( $this->mTitle, $editInfo->output, false );
2777                 $u->setRecursiveTouch( $changed ); // refresh/invalidate including pages too
2778                 $u->doUpdate();
2779
2780                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
2781
2782                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2783                         if( 0 == mt_rand( 0, 99 ) ) {
2784                                 // Flush old entries from the `recentchanges` table; we do this on
2785                                 // random requests so as to avoid an increase in writes for no good reason
2786                                 global $wgRCMaxAge;
2787                                 $dbw = wfGetDB( DB_MASTER );
2788                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2789                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2790                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2791                                 $dbw->query( $sql );
2792                         }
2793                 }
2794
2795                 $id = $this->getID();
2796                 $title = $this->mTitle->getPrefixedDBkey();
2797                 $shortTitle = $this->mTitle->getDBkey();
2798
2799                 if( 0 == $id ) {
2800                         wfProfileOut( __METHOD__ );
2801                         return;
2802                 }
2803
2804                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2805                 array_push( $wgDeferredUpdateList, $u );
2806                 $u = new SearchUpdate( $id, $title, $text );
2807                 array_push( $wgDeferredUpdateList, $u );
2808
2809                 # If this is another user's talk page, update newtalk
2810                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2811                 # load of user talk pages and piss people off, nor if it's a minor edit
2812                 # by a properly-flagged bot.
2813                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2814                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
2815                         if( wfRunHooks('ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2816                                 $other = User::newFromName( $shortTitle, false );
2817                                 if( !$other ) {
2818                                         wfDebug( __METHOD__.": invalid username\n" );
2819                                 } elseif( User::isIP( $shortTitle ) ) {
2820                                         // An anonymous user
2821                                         $other->setNewtalk( true );
2822                                 } elseif( $other->isLoggedIn() ) {
2823                                         $other->setNewtalk( true );
2824                                 } else {
2825                                         wfDebug( __METHOD__. ": don't need to notify a nonexistent user\n" );
2826                                 }
2827                         }
2828                 }
2829
2830                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2831                         $wgMessageCache->replace( $shortTitle, $text );
2832                 }
2833
2834                 wfProfileOut( __METHOD__ );
2835         }
2836
2837         /**
2838          * Perform article updates on a special page creation.
2839          *
2840          * @param $rev Revision object
2841          *
2842          * @todo This is a shitty interface function. Kill it and replace the
2843          * other shitty functions like editUpdates and such so it's not needed
2844          * anymore.
2845          */
2846         public function createUpdates( $rev ) {
2847                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2848                 $this->mTotalAdjustment = 1;
2849                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2850                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2851         }
2852
2853         /**
2854          * Generate the navigation links when browsing through an article revisions
2855          * It shows the information as:
2856          *   Revision as of \<date\>; view current revision
2857          *   \<- Previous version | Next Version -\>
2858          *
2859          * @param $oldid String: revision ID of this article revision
2860          */
2861         public function setOldSubtitle( $oldid=0 ) {
2862                 global $wgLang, $wgOut, $wgUser;
2863
2864                 if( !wfRunHooks( 'DisplayOldSubtitle', array(&$this, &$oldid) ) ) {
2865                         return;
2866                 }
2867
2868                 $revision = Revision::newFromId( $oldid );
2869
2870                 $current = ( $oldid == $this->mLatest );
2871                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2872                 $sk = $wgUser->getSkin();
2873                 $lnk = $current
2874                         ? wfMsg( 'currentrevisionlink' )
2875                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2876                 $curdiff = $current
2877                         ? wfMsg( 'diff' )
2878                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=cur&oldid='.$oldid );
2879                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2880                 $prevlink = $prev
2881                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2882                         : wfMsg( 'previousrevision' );
2883                 $prevdiff = $prev
2884                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=prev&oldid='.$oldid )
2885                         : wfMsg( 'diff' );
2886                 $nextlink = $current
2887                         ? wfMsg( 'nextrevision' )
2888                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2889                 $nextdiff = $current
2890                         ? wfMsg( 'diff' )
2891                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=next&oldid='.$oldid );
2892
2893                 $cdel='';
2894                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
2895                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
2896                         if( $revision->isCurrent() ) {
2897                         // We don't handle top deleted edits too well
2898                                 $cdel = wfMsgHtml('rev-delundel');
2899                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
2900                         // If revision was hidden from sysops
2901                                 $cdel = wfMsgHtml('rev-delundel');
2902                         } else {
2903                                 $cdel = $sk->makeKnownLinkObj( $revdel,
2904                                         wfMsgHtml('rev-delundel'),
2905                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
2906                                         '&oldid=' . urlencode( $oldid ) );
2907                                 // Bolden oversighted content
2908                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
2909                                         $cdel = "<strong>$cdel</strong>";
2910                         }
2911                         $cdel = "(<small>$cdel</small>) ";
2912                 }
2913                 # Show user links if allowed to see them. Normally they
2914                 # are hidden regardless, but since we can already see the text here...
2915                 $userlinks = $sk->revUserTools( $revision, false );
2916
2917                 $m = wfMsg( 'revision-info-current' );
2918                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
2919                         ? 'revision-info-current'
2920                         : 'revision-info';
2921
2922                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsg( $infomsg, $td, $userlinks, $revision->getID() ) . "</div>\n" .
2923
2924                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsg( 'revision-nav', $prevdiff,
2925                                 $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
2926                 $wgOut->setSubtitle( $r );
2927         }
2928
2929         /**
2930          * This function is called right before saving the wikitext,
2931          * so we can do things like signatures and links-in-context.
2932          *
2933          * @param $text String
2934          */
2935         public function preSaveTransform( $text ) {
2936                 global $wgParser, $wgUser;
2937                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2938         }
2939
2940         /* Caching functions */
2941
2942         /**
2943          * checkLastModified returns true if it has taken care of all
2944          * output to the client that is necessary for this request.
2945          * (that is, it has sent a cached version of the page)
2946          */
2947         protected function tryFileCache() {
2948                 static $called = false;
2949                 if( $called ) {
2950                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2951                         return false;
2952                 }
2953                 $called = true;
2954                 if( $this->isFileCacheable() ) {
2955                         $cache = new HTMLFileCache( $this->mTitle );
2956                         if( $cache->isFileCacheGood( $this->mTouched ) ) {
2957                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2958                                 $cache->loadFromFileCache();
2959                                 return true;
2960                         } else {
2961                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2962                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2963                         }
2964                 } else {
2965                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2966                 }
2967                 return false;
2968         }
2969
2970         /**
2971          * Check if the page can be cached
2972          * @return bool
2973          */
2974         public function isFileCacheable() {
2975                 $cacheable = false;
2976                 if( HTMLFileCache::useFileCache() ) {
2977                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
2978                         // Extension may have reason to disable file caching on some pages.
2979                         if( $cacheable ) {
2980                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
2981                         }
2982                 }
2983                 return $cacheable;
2984         }
2985
2986         /**
2987          * Loads page_touched and returns a value indicating if it should be used
2988          *
2989          */
2990         public function checkTouched() {
2991                 if( !$this->mDataLoaded ) {
2992                         $this->loadPageData();
2993                 }
2994                 return !$this->mIsRedirect;
2995         }
2996
2997         /**
2998          * Get the page_touched field
2999          */
3000         public function getTouched() {
3001                 # Ensure that page data has been loaded
3002                 if( !$this->mDataLoaded ) {
3003                         $this->loadPageData();
3004                 }
3005                 return $this->mTouched;
3006         }
3007
3008         /**
3009          * Get the page_latest field
3010          */
3011         public function getLatest() {
3012                 if( !$this->mDataLoaded ) {
3013                         $this->loadPageData();
3014                 }
3015                 return $this->mLatest;
3016         }
3017
3018         /**
3019          * Edit an article without doing all that other stuff
3020          * The article must already exist; link tables etc
3021          * are not updated, caches are not flushed.
3022          *
3023          * @param $text String: text submitted
3024          * @param $comment String: comment submitted
3025          * @param $minor Boolean: whereas it's a minor modification
3026          */
3027         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3028                 wfProfileIn( __METHOD__ );
3029
3030                 $dbw = wfGetDB( DB_MASTER );
3031                 $revision = new Revision( array(
3032                         'page'       => $this->getId(),
3033                         'text'       => $text,
3034                         'comment'    => $comment,
3035                         'minor_edit' => $minor ? 1 : 0,
3036                         ) );
3037                 $revision->insertOn( $dbw );
3038                 $this->updateRevisionOn( $dbw, $revision );
3039
3040                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $wgUser) );
3041
3042                 wfProfileOut( __METHOD__ );
3043         }
3044
3045         /**
3046          * Used to increment the view counter
3047          *
3048          * @param $id Integer: article id
3049          */
3050         public static function incViewCount( $id ) {
3051                 $id = intval( $id );
3052                 global $wgHitcounterUpdateFreq, $wgDBtype;
3053
3054                 $dbw = wfGetDB( DB_MASTER );
3055                 $pageTable = $dbw->tableName( 'page' );
3056                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3057                 $acchitsTable = $dbw->tableName( 'acchits' );
3058
3059                 if( $wgHitcounterUpdateFreq <= 1 ) {
3060                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3061                         return;
3062                 }
3063
3064                 # Not important enough to warrant an error page in case of failure
3065                 $oldignore = $dbw->ignoreErrors( true );
3066
3067                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3068
3069                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
3070                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
3071                         # Most of the time (or on SQL errors), skip row count check
3072                         $dbw->ignoreErrors( $oldignore );
3073                         return;
3074                 }
3075
3076                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
3077                 $row = $dbw->fetchObject( $res );
3078                 $rown = intval( $row->n );
3079                 if( $rown >= $wgHitcounterUpdateFreq ){
3080                         wfProfileIn( 'Article::incViewCount-collect' );
3081                         $old_user_abort = ignore_user_abort( true );
3082
3083                         if($wgDBtype == 'mysql')
3084                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
3085                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
3086                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
3087                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
3088                                 'GROUP BY hc_id');
3089                         $dbw->query("DELETE FROM $hitcounterTable");
3090                         if($wgDBtype == 'mysql') {
3091                                 $dbw->query('UNLOCK TABLES');
3092                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3093                                         'WHERE page_id = hc_id');
3094                         }
3095                         else {
3096                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3097                                         "FROM $acchitsTable WHERE page_id = hc_id");
3098                         }
3099                         $dbw->query("DROP TABLE $acchitsTable");
3100
3101                         ignore_user_abort( $old_user_abort );
3102                         wfProfileOut( 'Article::incViewCount-collect' );
3103                 }
3104                 $dbw->ignoreErrors( $oldignore );
3105         }
3106
3107         /**#@+
3108          * The onArticle*() functions are supposed to be a kind of hooks
3109          * which should be called whenever any of the specified actions
3110          * are done.
3111          *
3112          * This is a good place to put code to clear caches, for instance.
3113          *
3114          * This is called on page move and undelete, as well as edit
3115          *
3116          * @param $title a title object
3117          */
3118
3119         public static function onArticleCreate( $title ) {
3120                 # Update existence markers on article/talk tabs...
3121                 if( $title->isTalkPage() ) {
3122                         $other = $title->getSubjectPage();
3123                 } else {
3124                         $other = $title->getTalkPage();
3125                 }
3126                 $other->invalidateCache();
3127                 $other->purgeSquid();
3128
3129                 $title->touchLinks();
3130                 $title->purgeSquid();
3131                 $title->deleteTitleProtection();
3132         }
3133
3134         public static function onArticleDelete( $title ) {
3135                 global $wgUseFileCache, $wgMessageCache;
3136                 # Update existence markers on article/talk tabs...
3137                 if( $title->isTalkPage() ) {
3138                         $other = $title->getSubjectPage();
3139                 } else {
3140                         $other = $title->getTalkPage();
3141                 }
3142                 $other->invalidateCache();
3143                 $other->purgeSquid();
3144
3145                 $title->touchLinks();
3146                 $title->purgeSquid();
3147
3148                 # File cache
3149                 if( $wgUseFileCache ) {
3150                         $cm = new HTMLFileCache( $title );
3151                         @unlink( $cm->fileCacheName() );
3152                 }
3153
3154                 # Messages
3155                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
3156                         $wgMessageCache->replace( $title->getDBkey(), false );
3157                 }
3158                 # Images
3159                 if( $title->getNamespace() == NS_FILE ) {
3160                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3161                         $update->doUpdate();
3162                 }
3163                 # User talk pages
3164                 if( $title->getNamespace() == NS_USER_TALK ) {
3165                         $user = User::newFromName( $title->getText(), false );
3166                         $user->setNewtalk( false );
3167                 }
3168         }
3169
3170         /**
3171          * Purge caches on page update etc
3172          */
3173         public static function onArticleEdit( $title, $transclusions = 'transclusions' ) {
3174                 global $wgDeferredUpdateList, $wgUseFileCache;
3175
3176                 // Invalidate caches of articles which include this page
3177                 if( $transclusions !== 'skiptransclusions' )
3178                         $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3179
3180                 // Invalidate the caches of all pages which redirect here
3181                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3182
3183                 # Purge squid for this page only
3184                 $title->purgeSquid();
3185
3186                 # Clear file cache for this page only
3187                 if( $wgUseFileCache ) {
3188                         $cm = new HTMLFileCache( $title );
3189                         @unlink( $cm->fileCacheName() );
3190                 }
3191         }
3192
3193         /**#@-*/
3194
3195         /**
3196          * Overriden by ImagePage class, only present here to avoid a fatal error
3197          * Called for ?action=revert
3198          */
3199         public function revert() {
3200                 global $wgOut;
3201                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3202         }
3203
3204         /**
3205          * Info about this page
3206          * Called for ?action=info when $wgAllowPageInfo is on.
3207          */
3208         public function info() {
3209                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3210
3211                 if( !$wgAllowPageInfo ) {
3212                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3213                         return;
3214                 }
3215
3216                 $page = $this->mTitle->getSubjectPage();
3217
3218                 $wgOut->setPagetitle( $page->getPrefixedText() );
3219                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3220                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ) );
3221
3222                 if( !$this->mTitle->exists() ) {
3223                         $wgOut->addHTML( '<div class="noarticletext">' );
3224                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3225                                 // This doesn't quite make sense; the user is asking for
3226                                 // information about the _page_, not the message... -- RC
3227                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3228                         } else {
3229                                 $msg = $wgUser->isLoggedIn()
3230                                         ? 'noarticletext'
3231                                         : 'noarticletextanon';
3232                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3233                         }
3234                         $wgOut->addHTML( '</div>' );
3235                 } else {
3236                         $dbr = wfGetDB( DB_SLAVE );
3237                         $wl_clause = array(
3238                                 'wl_title'     => $page->getDBkey(),
3239                                 'wl_namespace' => $page->getNamespace() );
3240                         $numwatchers = $dbr->selectField(
3241                                 'watchlist',
3242                                 'COUNT(*)',
3243                                 $wl_clause,
3244                                 __METHOD__,
3245                                 $this->getSelectOptions() );
3246
3247                         $pageInfo = $this->pageCountInfo( $page );
3248                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3249
3250                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3251                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3252                         if( $talkInfo ) {
3253                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3254                         }
3255                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3256                         if( $talkInfo ) {
3257                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3258                         }
3259                         $wgOut->addHTML( '</ul>' );
3260                 }
3261         }
3262
3263         /**
3264          * Return the total number of edits and number of unique editors
3265          * on a given page. If page does not exist, returns false.
3266          *
3267          * @param $title Title object
3268          * @return array
3269          */
3270         protected function pageCountInfo( $title ) {
3271                 $id = $title->getArticleId();
3272                 if( $id == 0 ) {
3273                         return false;
3274                 }
3275                 $dbr = wfGetDB( DB_SLAVE );
3276                 $rev_clause = array( 'rev_page' => $id );
3277                 $edits = $dbr->selectField(
3278                         'revision',
3279                         'COUNT(rev_page)',
3280                         $rev_clause,
3281                         __METHOD__,
3282                         $this->getSelectOptions()
3283                 );
3284                 $authors = $dbr->selectField(
3285                         'revision',
3286                         'COUNT(DISTINCT rev_user_text)',
3287                         $rev_clause,
3288                         __METHOD__,
3289                         $this->getSelectOptions()
3290                 );
3291                 return array( 'edits' => $edits, 'authors' => $authors );
3292         }
3293
3294         /**
3295          * Return a list of templates used by this article.
3296          * Uses the templatelinks table
3297          *
3298          * @return Array of Title objects
3299          */
3300         public function getUsedTemplates() {
3301                 $result = array();
3302                 $id = $this->mTitle->getArticleID();
3303                 if( $id == 0 ) {
3304                         return array();
3305                 }
3306                 $dbr = wfGetDB( DB_SLAVE );
3307                 $res = $dbr->select( array( 'templatelinks' ),
3308                         array( 'tl_namespace', 'tl_title' ),
3309                         array( 'tl_from' => $id ),
3310                         __METHOD__ );
3311                 if( $res !== false ) {
3312                         foreach( $res as $row ) {
3313                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3314                         }
3315                 }
3316                 $dbr->freeResult( $res );
3317                 return $result;
3318         }
3319
3320         /**
3321          * Returns a list of hidden categories this page is a member of.
3322          * Uses the page_props and categorylinks tables.
3323          *
3324          * @return Array of Title objects
3325          */
3326         public function getHiddenCategories() {
3327                 $result = array();
3328                 $id = $this->mTitle->getArticleID();
3329                 if( $id == 0 ) {
3330                         return array();
3331                 }
3332                 $dbr = wfGetDB( DB_SLAVE );
3333                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3334                         array( 'cl_to' ),
3335                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3336                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3337                         __METHOD__ );
3338                 if( $res !== false ) {
3339                         foreach( $res as $row ) {
3340                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3341                         }
3342                 }
3343                 $dbr->freeResult( $res );
3344                 return $result;
3345         }
3346
3347         /**
3348         * Return an applicable autosummary if one exists for the given edit.
3349         * @param $oldtext String: the previous text of the page.
3350         * @param $newtext String: The submitted text of the page.
3351         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
3352         * @return string An appropriate autosummary, or an empty string.
3353         */
3354         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3355                 # Decide what kind of autosummary is needed.
3356
3357                 # Redirect autosummaries
3358                 $ot = Title::newFromRedirect( $oldtext );
3359                 $rt = Title::newFromRedirect( $newtext );
3360                 if( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
3361                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3362                 }
3363
3364                 # New page autosummaries
3365                 if( $flags & EDIT_NEW && strlen( $newtext ) ) {
3366                         # If they're making a new article, give its text, truncated, in the summary.
3367                         global $wgContLang;
3368                         $truncatedtext = $wgContLang->truncate(
3369                                 str_replace("\n", ' ', $newtext),
3370                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ),
3371                                 '...' );
3372                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3373                 }
3374
3375                 # Blanking autosummaries
3376                 if( $oldtext != '' && $newtext == '' ) {
3377                         return wfMsgForContent( 'autosumm-blank' );
3378                 } elseif( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500) {
3379                         # Removing more than 90% of the article
3380                         global $wgContLang;
3381                         $truncatedtext = $wgContLang->truncate(
3382                                 $newtext,
3383                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ),
3384                                 '...'
3385                         );
3386                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3387                 }
3388
3389                 # If we reach this point, there's no applicable autosummary for our case, so our
3390                 # autosummary is empty.
3391                 return '';
3392         }
3393
3394         /**
3395          * Add the primary page-view wikitext to the output buffer
3396          * Saves the text into the parser cache if possible.
3397          * Updates templatelinks if it is out of date.
3398          *
3399          * @param $text String
3400          * @param $cache Boolean
3401          */
3402         public function outputWikiText( $text, $cache = true ) {
3403                 global $wgParser, $wgUser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
3404
3405                 $popts = $wgOut->parserOptions();
3406                 $popts->setTidy(true);
3407                 $popts->enableLimitReport();
3408                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3409                         $popts, true, true, $this->getRevIdFetched() );
3410                 $popts->setTidy(false);
3411                 $popts->enableLimitReport( false );
3412                 if( $wgEnableParserCache && $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3413                         $parserCache = ParserCache::singleton();
3414                         $parserCache->save( $parserOutput, $this, $wgUser );
3415                 }
3416                 // Make sure file cache is not used on uncacheable content.
3417                 // Output that has magic words in it can still use the parser cache
3418                 // (if enabled), though it will generally expire sooner.
3419                 if( $parserOutput->getCacheTime() == -1 || $parserOutput->containsOldMagic() ) {
3420                         $wgUseFileCache = false;
3421                 }
3422
3423                 if( $this->isCurrent() && !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3424                         // templatelinks table may have become out of sync,
3425                         // especially if using variable-based transclusions.
3426                         // For paranoia, check if things have changed and if
3427                         // so apply updates to the database. This will ensure
3428                         // that cascaded protections apply as soon as the changes
3429                         // are visible.
3430
3431                         # Get templates from templatelinks
3432                         $id = $this->mTitle->getArticleID();
3433
3434                         $tlTemplates = array();
3435
3436                         $dbr = wfGetDB( DB_SLAVE );
3437                         $res = $dbr->select( array( 'templatelinks' ),
3438                                 array( 'tl_namespace', 'tl_title' ),
3439                                 array( 'tl_from' => $id ),
3440                                 __METHOD__ );
3441
3442                         global $wgContLang;
3443
3444                         if( $res !== false ) {
3445                                 foreach( $res as $row ) {
3446                                         $tlTemplates[] = $wgContLang->getNsText( $row->tl_namespace ) . ':' . $row->tl_title ;
3447                                 }
3448                         }
3449
3450                         # Get templates from parser output.
3451                         $poTemplates_allns = $parserOutput->getTemplates();
3452
3453                         $poTemplates = array ();
3454                         foreach ( $poTemplates_allns as $ns_templates ) {
3455                                 $poTemplates = array_merge( $poTemplates, $ns_templates );
3456                         }
3457
3458                         # Get the diff
3459                         $templates_diff = array_diff( $poTemplates, $tlTemplates );
3460
3461                         if( count( $templates_diff ) > 0 ) {
3462                                 # Whee, link updates time.
3463                                 $u = new LinksUpdate( $this->mTitle, $parserOutput );
3464                                 $u->doUpdate();
3465                         }
3466                 }
3467
3468                 $wgOut->addParserOutput( $parserOutput );
3469         }
3470
3471         /**
3472          * Update all the appropriate counts in the category table, given that
3473          * we've added the categories $added and deleted the categories $deleted.
3474          *
3475          * @param $added array   The names of categories that were added
3476          * @param $deleted array The names of categories that were deleted
3477          * @return null
3478          */
3479         public function updateCategoryCounts( $added, $deleted ) {
3480                 $ns = $this->mTitle->getNamespace();
3481                 $dbw = wfGetDB( DB_MASTER );
3482
3483                 # First make sure the rows exist.  If one of the "deleted" ones didn't
3484                 # exist, we might legitimately not create it, but it's simpler to just
3485                 # create it and then give it a negative value, since the value is bogus
3486                 # anyway.
3487                 #
3488                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3489                 $insertCats = array_merge( $added, $deleted );
3490                 if( !$insertCats ) {
3491                         # Okay, nothing to do
3492                         return;
3493                 }
3494                 $insertRows = array();
3495                 foreach( $insertCats as $cat ) {
3496                         $insertRows[] = array( 'cat_title' => $cat );
3497                 }
3498                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3499
3500                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3501                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3502                 if( $ns == NS_CATEGORY ) {
3503                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3504                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3505                 } elseif( $ns == NS_FILE ) {
3506                         $addFields[]    = 'cat_files = cat_files + 1';
3507                         $removeFields[] = 'cat_files = cat_files - 1';
3508                 }
3509
3510                 if( $added ) {
3511                         $dbw->update(
3512                                 'category',
3513                                 $addFields,
3514                                 array( 'cat_title' => $added ),
3515                                 __METHOD__
3516                         );
3517                 }
3518                 if( $deleted ) {
3519                         $dbw->update(
3520                                 'category',
3521                                 $removeFields,
3522                                 array( 'cat_title' => $deleted ),
3523                                 __METHOD__
3524                         );
3525                 }
3526         }
3527 }