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 Database $dbr
 310          * @param array    $conditions
 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 Database $dbr
 339          * @param Title $title
 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 Database $dbr
 349          * @param int $id
 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 object $data
 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 int $oldid 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                 $sk = $wgUser->getSkin();
 678
 679                 wfProfileIn( __METHOD__ );
 680
 681                 $parserCache = ParserCache::singleton();
 682                 $ns = $this->mTitle->getNamespace(); # shortcut
 683
 684                 # Get variables from query string
 685                 $oldid = $this->getOldID();
 686
 687                 # getOldID may want us to redirect somewhere else
 688                 if( $this->mRedirectUrl ) {
 689                         $wgOut->redirect( $this->mRedirectUrl );
 690                         wfProfileOut( __METHOD__ );
 691                         return;
 692                 }
 693
 694                 $diff = $wgRequest->getVal( 'diff' );
 695                 $rcid = $wgRequest->getVal( 'rcid' );
 696                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 697                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 698                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 699
 700                 $wgOut->setArticleFlag( true );
 701
 702                 # Discourage indexing of printable versions, but encourage following
 703                 if( $wgOut->isPrintable() ) {
 704                         $policy = 'noindex,follow';
 705                 } elseif( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 706                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 707                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 708                         # Honour customised robot policies for this namespace
 709                         $policy = $wgNamespaceRobotPolicies[$ns];
 710                 } else {
 711                         $policy = $wgDefaultRobotPolicy;
 712                 }
 713                 $wgOut->setRobotPolicy( $policy );
 714
 715                 # If we got diff and oldid in the query, we want to see a
 716                 # diff page instead of the article.
 717
 718                 if( !is_null( $diff ) ) {
 719                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 720
 721                         $diff = $wgRequest->getVal( 'diff' );
 722                         $htmldiff = $wgRequest->getVal( 'htmldiff' , false);
 723                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $htmldiff);
 724                         // DifferenceEngine directly fetched the revision:
 725                         $this->mRevIdFetched = $de->mNewid;
 726                         $de->showDiffPage( $diffOnly );
 727
 728                         // Needed to get the page's current revision
 729                         $this->loadPageData();
 730                         if( $diff == 0 || $diff == $this->mLatest ) {
 731                                 # Run view updates for current revision only
 732                                 $this->viewUpdates();
 733                         }
 734                         wfProfileOut( __METHOD__ );
 735                         return;
 736                 }
 737
 738                 if( empty( $oldid ) && $this->checkTouched() ) {
 739                         $wgOut->setETag($parserCache->getETag($this, $wgUser));
 740
 741                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 742                                 wfProfileOut( __METHOD__ );
 743                                 return;
 744                         } else if( $this->tryFileCache() ) {
 745                                 # tell wgOut that output is taken care of
 746                                 $wgOut->disable();
 747                                 $this->viewUpdates();
 748                                 wfProfileOut( __METHOD__ );
 749                                 return;
 750                         }
 751                 }
 752
 753                 # Should the parser cache be used?
 754                 $pcache = $this->useParserCache( $oldid );
 755                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 756                 if( $wgUser->getOption( 'stubthreshold' ) ) {
 757                         wfIncrStats( 'pcache_miss_stub' );
 758                 }
 759
 760                 $wasRedirected = false;
 761                 if( isset( $this->mRedirectedFrom ) ) {
 762                         // This is an internally redirected page view.
 763                         // We'll need a backlink to the source page for navigation.
 764                         if( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 765                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 766                                 $s = wfMsg( 'redirectedfrom', $redir );
 767                                 $wgOut->setSubtitle( $s );
 768
 769                                 // Set the fragment if one was specified in the redirect
 770                                 if( strval( $this->mTitle->getFragment() ) != '' ) {
 771                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 772                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 773                                 }
 774                                 $wasRedirected = true;
 775                         }
 776                 } elseif( !empty( $rdfrom ) ) {
 777                         // This is an externally redirected view, from some other wiki.
 778                         // If it was reported from a trusted site, supply a backlink.
 779                         global $wgRedirectSources;
 780                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 781                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 782                                 $s = wfMsg( 'redirectedfrom', $redir );
 783                                 $wgOut->setSubtitle( $s );
 784                                 $wasRedirected = true;
 785                         }
 786                 }
 787
 788                 $outputDone = false;
 789                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 790                 if( $pcache && $wgOut->tryParserCache( $this, $wgUser ) ) {
 791                         // Ensure that UI elements requiring revision ID have
 792                         // the correct version information.
 793                         $wgOut->setRevisionId( $this->mLatest );
 794                         $outputDone = true;
 795                 }
 796                 # Fetch content and check for errors
 797                 if( !$outputDone ) {
 798                         # If the article does not exist and was deleted, show the log
 799                         if( $this->getID() == 0 ) {
 800                                 $this->showDeletionLog();
 801                         }
 802                         $text = $this->getContent();
 803                         if( $text === false ) {
 804                                 # Failed to load, replace text with error message
 805                                 $t = $this->mTitle->getPrefixedText();
 806                                 if( $oldid ) {
 807                                         $d = wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid );
 808                                         $text = wfMsg( 'missing-article', $t, $d );
 809                                 } else {
 810                                         $text = wfMsg( 'noarticletext' );
 811                                 }
 812                         }
 813                         # Non-existent pages
 814                         if( $this->getID() === 0 ) {
 815                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 816                                 $text = "<div class='noarticletext'>\n$text\n</div>";
 817                         }
 818
 819                         # Another whitelist check in case oldid is altering the title
 820                         if( !$this->mTitle->userCanRead() ) {
 821                                 $wgOut->loginToUse();
 822                                 $wgOut->output();
 823                                 wfProfileOut( __METHOD__ );
 824                                 exit;
 825                         }
 826
 827                         # We're looking at an old revision
 828                         if( !empty( $oldid ) ) {
 829                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 830                                 if( is_null( $this->mRevision ) ) {
 831                                         // FIXME: This would be a nice place to load the 'no such page' text.
 832                                 } else {
 833                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 834                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 835                                                 if( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 836                                                         $wgOut->addWikiMsg( 'rev-deleted-text-permission' );
 837                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 838                                                         wfProfileOut( __METHOD__ );
 839                                                         return;
 840                                                 } else {
 841                                                         $wgOut->addWikiMsg( 'rev-deleted-text-view' );
 842                                                         // and we are allowed to see...
 843                                                 }
 844                                         }
 845                                 }
 846                         }
 847
 848                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 849
 850                          // Pages containing custom CSS or JavaScript get special treatment
 851                         if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 852                                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
 853                                 // Give hooks a chance to customise the output
 854                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 855                                         // Wrap the whole lot in a <pre> and don't parse
 856                                         $m = array();
 857                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 858                                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 859                                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 860                                         $wgOut->addHTML( "\n</pre>\n" );
 861                                 }
 862                         } else if( $rt = Title::newFromRedirect( $text ) ) {
 863                                 # Don't append the subtitle if this was an old revision
 864                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 865                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 866                                 $wgOut->addParserOutputNoText( $parseout );
 867                         } else if( $pcache ) {
 868                                 # Display content and save to parser cache
 869                                 $this->outputWikiText( $text );
 870                         } else {
 871                                 # Display content, don't attempt to save to parser cache
 872                                 # Don't show section-edit links on old revisions... this way lies madness.
 873                                 if( !$this->isCurrent() ) {
 874                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 875                                 }
 876                                 # Display content and don't save to parser cache
 877                                 # With timing hack -- TS 2006-07-26
 878                                 $time = -wfTime();
 879                                 $this->outputWikiText( $text, false );
 880                                 $time += wfTime();
 881
 882                                 # Timing hack
 883                                 if( $time > 3 ) {
 884                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 885                                                 $this->mTitle->getPrefixedDBkey()));
 886                                 }
 887
 888                                 if( !$this->isCurrent() ) {
 889                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 890                                 }
 891                         }
 892                 }
 893                 /* title may have been set from the cache */
 894                 $t = $wgOut->getPageTitle();
 895                 if( empty( $t ) ) {
 896                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 897
 898                         # For the main page, overwrite the <title> element with the con-
 899                         # tents of 'pagetitle-view-mainpage' instead of the default (if
 900                         # that's not empty).
 901                         if( $this->mTitle->equals( Title::newMainPage() ) &&
 902                         wfMsgForContent( 'pagetitle-view-mainpage' ) !== '' ) {
 903                                 $wgOut->setHTMLTitle( wfMsgForContent( 'pagetitle-view-mainpage' ) );
 904                         }
 905                 }
 906
 907                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 908                 if( $ns == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
 909                         $wgOut->addWikiMsg('anontalkpagetext');
 910                 }
 911
 912                 # If we have been passed an &rcid= parameter, we want to give the user a
 913                 # chance to mark this new article as patrolled.
 914                 if( !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) && $this->mTitle->exists() ) {
 915                         $wgOut->addHTML(
 916                                 "<div class='patrollink'>" .
 917                                         wfMsgHtml( 'markaspatrolledlink',
 918                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
 919                                                 "action=markpatrolled&rcid=$rcid" )
 920                                         ) .
 921                                 '</div>'
 922                          );
 923                 }
 924
 925                 # Trackbacks
 926                 if( $wgUseTrackbacks ) {
 927                         $this->addTrackbacks();
 928                 }
 929
 930                 $this->viewUpdates();
 931                 wfProfileOut( __METHOD__ );
 932         }
 933
 934         protected function showDeletionLog() {
 935                 global $wgUser, $wgOut;
 936                 $loglist = new LogEventsList( $wgUser->getSkin(), $wgOut );
 937                 $pager = new LogPager( $loglist, 'delete', false, $this->mTitle->getPrefixedText() );
 938                 if( $pager->getNumRows() > 0 ) {
 939                         $pager->mLimit = 10;
 940                         $wgOut->addHTML( '<div class="mw-warning-with-logexcerpt">' );
 941                         $wgOut->addWikiMsg( 'deleted-notice' );
 942                         $wgOut->addHTML(
 943                                 $loglist->beginLogEventsList() .
 944                                 $pager->getBody() .
 945                                 $loglist->endLogEventsList()
 946                         );
 947                         if( $pager->getNumRows() > 10 ) {
 948                                 $wgOut->addHTML( $wgUser->getSkin()->link(
 949                                         SpecialPage::getTitleFor( 'Log' ),
 950                                         wfMsgHtml( 'deletelog-fulllog' ),
 951                                         array(),
 952                                         array( 'type' => 'delete', 'page' => $this->mTitle->getPrefixedText() )
 953                                 ) );
 954                         }
 955                         $wgOut->addHTML( '</div>' );
 956                 }
 957         }
 958
 959         /*
 960         * Should the parser cache be used?
 961         */
 962         protected function useParserCache( $oldid ) {
 963                 global $wgUser, $wgEnableParserCache;
 964
 965                 return $wgEnableParserCache
 966                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
 967                         && $this->exists()
 968                         && empty( $oldid )
 969                         && !$this->mTitle->isCssOrJsPage()
 970                         && !$this->mTitle->isCssJsSubpage();
 971         }
 972
 973         /**
 974          * View redirect
 975          * @param Title $target Title of destination to redirect
 976          * @param Bool  $appendSubtitle [optional]
 977          * @param Bool  $forceKnown Should the image be shown as a bluelink regardless of existence?
 978          */
 979         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
 980                 global $wgParser, $wgOut, $wgContLang, $wgStylePath, $wgUser;
 981                 # Display redirect
 982                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 983                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 984
 985                 if( $appendSubtitle ) {
 986                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 987                 }
 988                 $sk = $wgUser->getSkin();
 989                 if( $forceKnown ) {
 990                         $link = $sk->makeKnownLinkObj( $target, htmlspecialchars( $target->getFullText() ) );
 991                 } else {
 992                         $link = $sk->makeLinkObj( $target, htmlspecialchars( $target->getFullText() ) );
 993                 }
 994                 return '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
 995                         '<span class="redirectText">'.$link.'</span>';
 996
 997         }
 998
 999         public function addTrackbacks() {
1000                 global $wgOut, $wgUser;
1001                 $dbr = wfGetDB( DB_SLAVE );
1002                 $tbs = $dbr->select( 'trackbacks',
1003                         array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
1004                         array('tb_page' => $this->getID() )
1005                 );
1006                 if( !$dbr->numRows($tbs) ) return;
1007
1008                 $tbtext = "";
1009                 while( $o = $dbr->fetchObject($tbs) ) {
1010                         $rmvtxt = "";
1011                         if( $wgUser->isAllowed( 'trackback' ) ) {
1012                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid=" .
1013                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1014                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1015                         }
1016                         $tbtext .= "\n";
1017                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
1018                                         $o->tb_title,
1019                                         $o->tb_url,
1020                                         $o->tb_ex,
1021                                         $o->tb_name,
1022                                         $rmvtxt);
1023                 }
1024                 $wgOut->addWikiMsg( 'trackbackbox', $tbtext );
1025                 $this->mTitle->invalidateCache();
1026         }
1027
1028         public function deletetrackback() {
1029                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
1030                 if( !$wgUser->matchEditToken($wgRequest->getVal('token')) ) {
1031                         $wgOut->addWikiMsg( 'sessionfailure' );
1032                         return;
1033                 }
1034
1035                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1036                 if( count($permission_errors) ) {
1037                         $wgOut->showPermissionsErrorPage( $permission_errors );
1038                         return;
1039                 }
1040
1041                 $db = wfGetDB( DB_MASTER );
1042                 $db->delete( 'trackbacks', array('tb_id' => $wgRequest->getInt('tbid')) );
1043
1044                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1045                 $this->mTitle->invalidateCache();
1046         }
1047
1048         public function render() {
1049                 global $wgOut;
1050                 $wgOut->setArticleBodyOnly(true);
1051                 $this->view();
1052         }
1053
1054         /**
1055          * Handle action=purge
1056          */
1057         public function purge() {
1058                 global $wgUser, $wgRequest, $wgOut;
1059                 if( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1060                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1061                                 $this->doPurge();
1062                                 $this->view();
1063                         }
1064                 } else {
1065                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1066                         $button = wfMsgExt( 'confirm_purge_button', array('escapenoentities') );
1067                         $form = "<form method=\"post\" action=\"$action\">\n" .
1068                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1069                                         "</form>\n";
1070                         $top = wfMsgExt( 'confirm-purge-top', array('parse') );
1071                         $bottom = wfMsgExt( 'confirm-purge-bottom', array('parse') );
1072                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1073                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1074                         $wgOut->addHTML( $top . $form . $bottom );
1075                 }
1076         }
1077
1078         /**
1079          * Perform the actions of a page purging
1080          */
1081         public function doPurge() {
1082                 global $wgUseSquid;
1083                 // Invalidate the cache
1084                 $this->mTitle->invalidateCache();
1085
1086                 if( $wgUseSquid ) {
1087                         // Commit the transaction before the purge is sent
1088                         $dbw = wfGetDB( DB_MASTER );
1089                         $dbw->immediateCommit();
1090
1091                         // Send purge
1092                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1093                         $update->doUpdate();
1094                 }
1095                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1096                         global $wgMessageCache;
1097                         if( $this->getID() == 0 ) {
1098                                 $text = false;
1099                         } else {
1100                                 $text = $this->getContent();
1101                         }
1102                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1103                 }
1104         }
1105
1106         /**
1107          * Insert a new empty page record for this article.
1108          * This *must* be followed up by creating a revision
1109          * and running $this->updateToLatest( $rev_id );
1110          * or else the record will be left in a funky state.
1111          * Best if all done inside a transaction.
1112          *
1113          * @param Database $dbw
1114          * @return int     The newly created page_id key, or false if the title already existed
1115          * @private
1116          */
1117         public function insertOn( $dbw ) {
1118                 wfProfileIn( __METHOD__ );
1119
1120                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1121                 $dbw->insert( 'page', array(
1122                         'page_id'           => $page_id,
1123                         'page_namespace'    => $this->mTitle->getNamespace(),
1124                         'page_title'        => $this->mTitle->getDBkey(),
1125                         'page_counter'      => 0,
1126                         'page_restrictions' => '',
1127                         'page_is_redirect'  => 0, # Will set this shortly...
1128                         'page_is_new'       => 1,
1129                         'page_random'       => wfRandom(),
1130                         'page_touched'      => $dbw->timestamp(),
1131                         'page_latest'       => 0, # Fill this in shortly...
1132                         'page_len'          => 0, # Fill this in shortly...
1133                 ), __METHOD__, 'IGNORE' );
1134
1135                 $affected = $dbw->affectedRows();
1136                 if( $affected ) {
1137                         $newid = $dbw->insertId();
1138                         $this->mTitle->resetArticleId( $newid );
1139                 }
1140                 wfProfileOut( __METHOD__ );
1141                 return $affected ? $newid : false;
1142         }
1143
1144         /**
1145          * Update the page record to point to a newly saved revision.
1146          *
1147          * @param Database $dbw
1148          * @param Revision $revision For ID number, and text used to set
1149                                      length and redirect status fields
1150          * @param int $lastRevision If given, will not overwrite the page field
1151          *                          when different from the currently set value.
1152          *                          Giving 0 indicates the new page flag should
1153          *                          be set on.
1154          * @param bool $lastRevIsRedirect If given, will optimize adding and
1155          *                                                      removing rows in redirect table.
1156          * @return bool true on success, false on failure
1157          * @private
1158          */
1159         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1160                 wfProfileIn( __METHOD__ );
1161
1162                 $text = $revision->getText();
1163                 $rt = Title::newFromRedirect( $text );
1164
1165                 $conditions = array( 'page_id' => $this->getId() );
1166                 if( !is_null( $lastRevision ) ) {
1167                         # An extra check against threads stepping on each other
1168                         $conditions['page_latest'] = $lastRevision;
1169                 }
1170
1171                 $dbw->update( 'page',
1172                         array( /* SET */
1173                                 'page_latest'      => $revision->getId(),
1174                                 'page_touched'     => $dbw->timestamp(),
1175                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1176                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1177                                 'page_len'         => strlen( $text ),
1178                         ),
1179                         $conditions,
1180                         __METHOD__ );
1181
1182                 $result = $dbw->affectedRows() != 0;
1183                 if( $result ) {
1184                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1185                 }
1186
1187                 wfProfileOut( __METHOD__ );
1188                 return $result;
1189         }
1190
1191         /**
1192          * Add row to the redirect table if this is a redirect, remove otherwise.
1193          *
1194          * @param Database $dbw
1195          * @param $redirectTitle a title object pointing to the redirect target,
1196          *                                                      or NULL if this is not a redirect
1197          * @param bool $lastRevIsRedirect If given, will optimize adding and
1198          *                                                      removing rows in redirect table.
1199          * @return bool true on success, false on failure
1200          * @private
1201          */
1202         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1203                 // Always update redirects (target link might have changed)
1204                 // Update/Insert if we don't know if the last revision was a redirect or not
1205                 // Delete if changing from redirect to non-redirect
1206                 $isRedirect = !is_null($redirectTitle);
1207                 if($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1208                         wfProfileIn( __METHOD__ );
1209                         if( $isRedirect ) {
1210                                 // This title is a redirect, Add/Update row in the redirect table
1211                                 $set = array( /* SET */
1212                                         'rd_namespace' => $redirectTitle->getNamespace(),
1213                                         'rd_title'     => $redirectTitle->getDBkey(),
1214                                         'rd_from'      => $this->getId(),
1215                                 );
1216                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1217                         } else {
1218                                 // This is not a redirect, remove row from redirect table
1219                                 $where = array( 'rd_from' => $this->getId() );
1220                                 $dbw->delete( 'redirect', $where, __METHOD__);
1221                         }
1222                         if( $this->getTitle()->getNamespace() == NS_IMAGE ) {
1223                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1224                         }
1225                         wfProfileOut( __METHOD__ );
1226                         return ( $dbw->affectedRows() != 0 );
1227                 }
1228                 return true;
1229         }
1230
1231         /**
1232          * If the given revision is newer than the currently set page_latest,
1233          * update the page record. Otherwise, do nothing.
1234          *
1235          * @param Database $dbw
1236          * @param Revision $revision
1237          */
1238         public function updateIfNewerOn( &$dbw, $revision ) {
1239                 wfProfileIn( __METHOD__ );
1240                 $row = $dbw->selectRow(
1241                         array( 'revision', 'page' ),
1242                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1243                         array(
1244                                 'page_id' => $this->getId(),
1245                                 'page_latest=rev_id' ),
1246                         __METHOD__ );
1247                 if( $row ) {
1248                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1249                                 wfProfileOut( __METHOD__ );
1250                                 return false;
1251                         }
1252                         $prev = $row->rev_id;
1253                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1254                 } else {
1255                         # No or missing previous revision; mark the page as new
1256                         $prev = 0;
1257                         $lastRevIsRedirect = null;
1258                 }
1259                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1260                 wfProfileOut( __METHOD__ );
1261                 return $ret;
1262         }
1263
1264         /**
1265          * @return string Complete article text, or null if error
1266          */
1267         function replaceSection( $section, $text, $summary = '', $edittime = NULL ) {
1268                 wfProfileIn( __METHOD__ );
1269                 if( $section === '' ) {
1270                         // Whole-page edit; let the whole text through
1271                 } else {
1272                         if( is_null($edittime) ) {
1273                                 $rev = Revision::newFromTitle( $this->mTitle );
1274                         } else {
1275                                 $dbw = wfGetDB( DB_MASTER );
1276                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1277                         }
1278                         if( !$rev ) {
1279                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1280                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1281                                 return null;
1282                         }
1283                         $oldtext = $rev->getText();
1284
1285                         if( $section == 'new' ) {
1286                                 # Inserting a new section
1287                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1288                                 $text = strlen( trim( $oldtext ) ) > 0
1289                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1290                                                 : "{$subject}{$text}";
1291                         } else {
1292                                 # Replacing an existing section; roll out the big guns
1293                                 global $wgParser;
1294                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1295                         }
1296                 }
1297                 wfProfileOut( __METHOD__ );
1298                 return $text;
1299         }
1300
1301         /**
1302          * @deprecated use Article::doEdit()
1303          */
1304         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1305                 wfDeprecated( __METHOD__ );
1306                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1307                         ( $isminor ? EDIT_MINOR : 0 ) |
1308                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1309                         ( $bot ? EDIT_FORCE_BOT : 0 );
1310
1311                 # If this is a comment, add the summary as headline
1312                 if( $comment && $summary != "" ) {
1313                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1314                 }
1315
1316                 $this->doEdit( $text, $summary, $flags );
1317
1318                 $dbw = wfGetDB( DB_MASTER );
1319                 if($watchthis) {
1320                         if(!$this->mTitle->userIsWatching()) {
1321                                 $dbw->begin();
1322                                 $this->doWatch();
1323                                 $dbw->commit();
1324                         }
1325                 } else {
1326                         if( $this->mTitle->userIsWatching() ) {
1327                                 $dbw->begin();
1328                                 $this->doUnwatch();
1329                                 $dbw->commit();
1330                         }
1331                 }
1332                 $this->doRedirect( $this->isRedirect( $text ) );
1333         }
1334
1335         /**
1336          * @deprecated use Article::doEdit()
1337          */
1338         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1339                 wfDeprecated( __METHOD__ );
1340                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1341                         ( $minor ? EDIT_MINOR : 0 ) |
1342                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1343
1344                 $status = $this->doEdit( $text, $summary, $flags );
1345                 if( !$status->isOK() ) {
1346                         return false;
1347                 }
1348
1349                 $dbw = wfGetDB( DB_MASTER );
1350                 if($watchthis) {
1351                         if(!$this->mTitle->userIsWatching()) {
1352                                 $dbw->begin();
1353                                 $this->doWatch();
1354                                 $dbw->commit();
1355                         }
1356                 } else {
1357                         if( $this->mTitle->userIsWatching() ) {
1358                                 $dbw->begin();
1359                                 $this->doUnwatch();
1360                                 $dbw->commit();
1361                         }
1362                 }
1363
1364                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1365                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1366
1367                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1368                 return true;
1369         }
1370
1371         /**
1372          * Article::doEdit()
1373          *
1374          * Change an existing article or create a new article. Updates RC and all necessary caches,
1375          * optionally via the deferred update array.
1376          *
1377          * $wgUser must be set before calling this function.
1378          *
1379          * @param string $text New text
1380          * @param string $summary Edit summary
1381          * @param integer $flags bitfield:
1382          *      EDIT_NEW
1383          *          Article is known or assumed to be non-existent, create a new one
1384          *      EDIT_UPDATE
1385          *          Article is known or assumed to be pre-existing, update it
1386          *      EDIT_MINOR
1387          *          Mark this edit minor, if the user is allowed to do so
1388          *      EDIT_SUPPRESS_RC
1389          *          Do not log the change in recentchanges
1390          *      EDIT_FORCE_BOT
1391          *          Mark the edit a "bot" edit regardless of user rights
1392          *      EDIT_DEFER_UPDATES
1393          *          Defer some of the updates until the end of index.php
1394          *      EDIT_AUTOSUMMARY
1395          *          Fill in blank summaries with generated text where possible
1396          *
1397          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1398          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1399          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1400          * edit-already-exists error will be returned. These two conditions are also possible with
1401          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1402          *
1403          * @param $baseRevId, the revision ID this edit was based off, if any
1404          *
1405          * @return Status object. Possible errors:
1406          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1407          *     edit-gone-missing:       In update mode, but the article didn't exist
1408          *     edit-conflict:           In update mode, the article changed unexpectedly
1409          *     edit-no-change:          Warning that the text was the same as before
1410          *     edit-already-exists:     In creation mode, but the article already exists
1411          *
1412          *  Extensions may define additional errors.
1413          *
1414          *  $return->value will contain an associative array with members as follows:
1415          *     new:                     Boolean indicating if the function attempted to create a new article
1416          *     revision:                The revision object for the inserted revision, or null
1417          *
1418          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1419          */
1420         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1421                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1422
1423                 # Low-level sanity check
1424                 if( $this->mTitle->getText() == '' ) {
1425                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1426                 }
1427
1428                 wfProfileIn( __METHOD__ );
1429
1430                 $user = is_null($user) ? $wgUser : $user;
1431                 $status = Status::newGood( array() );
1432
1433                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1434                 $this->loadPageData();
1435
1436                 if( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1437                         $aid = $this->mTitle->getArticleID();
1438                         if( $aid ) {
1439                                 $flags |= EDIT_UPDATE;
1440                         } else {
1441                                 $flags |= EDIT_NEW;
1442                         }
1443                 }
1444
1445                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1446                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1447                 {
1448                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1449                         wfProfileOut( __METHOD__ );
1450                         if( $status->isOK() ) {
1451                                 $status->fatal( 'edit-hook-aborted');
1452                         }
1453                         return $status;
1454                 }
1455
1456                 # Silently ignore EDIT_MINOR if not allowed
1457                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed('minoredit');
1458                 $bot = $flags & EDIT_FORCE_BOT;
1459
1460                 $oldtext = $this->getContent();
1461                 $oldsize = strlen( $oldtext );
1462
1463                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1464                 if( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1465                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1466                 }
1467
1468                 $editInfo = $this->prepareTextForEdit( $text );
1469                 $text = $editInfo->pst;
1470                 $newsize = strlen( $text );
1471
1472                 $dbw = wfGetDB( DB_MASTER );
1473                 $now = wfTimestampNow();
1474
1475                 if( $flags & EDIT_UPDATE ) {
1476                         # Update article, but only if changed.
1477                         $status->value['new'] = false;
1478                         # Make sure the revision is either completely inserted or not inserted at all
1479                         if( !$wgDBtransactions ) {
1480                                 $userAbort = ignore_user_abort( true );
1481                         }
1482
1483                         $revisionId = 0;
1484
1485                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1486
1487                         if( $changed ) {
1488                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1489                                   - (int)$this->isCountable( $oldtext );
1490                                 $this->mTotalAdjustment = 0;
1491
1492                                 if( !$this->mLatest ) {
1493                                         # Article gone missing
1494                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1495                                         $status->fatal( 'edit-gone-missing' );
1496                                         wfProfileOut( __METHOD__ );
1497                                         return $status;
1498                                 }
1499
1500                                 $revision = new Revision( array(
1501                                         'page'       => $this->getId(),
1502                                         'comment'    => $summary,
1503                                         'minor_edit' => $isminor,
1504                                         'text'       => $text,
1505                                         'parent_id'  => $this->mLatest,
1506                                         'user'       => $user->getId(),
1507                                         'user_text'  => $user->getName(),
1508                                         ) );
1509
1510                                 $dbw->begin();
1511                                 $revisionId = $revision->insertOn( $dbw );
1512
1513                                 # Update page
1514                                 #
1515                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1516                                 # during the course of this function. This makes sure that EditPage can detect
1517                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1518                                 # before this function is called. A previous function used a separate query, this
1519                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1520                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1521
1522                                 if( !$ok ) {
1523                                         /* Belated edit conflict! Run away!! */
1524                                         $status->fatal( 'edit-conflict' );
1525                                         # Delete the invalid revision if the DB is not transactional
1526                                         if( !$wgDBtransactions ) {
1527                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1528                                         }
1529                                         $revisionId = 0;
1530                                         $dbw->rollback();
1531                                 } else {
1532                                         global $wgUseRCPatrol;
1533                                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, $baseRevId, $user) );
1534                                         # Update recentchanges
1535                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1536                                                 # Mark as patrolled if the user can do so
1537                                                 $patrolled = $wgUseRCPatrol && $user->isAllowed('autopatrol');
1538                                                 # Add RC row to the DB
1539                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1540                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1541                                                         $revisionId, $patrolled
1542                                                 );
1543                                                 # Log auto-patrolled edits
1544                                                 if( $patrolled ) {
1545                                                         PatrolLog::record( $rc, true );
1546                                                 }
1547                                         }
1548                                         $user->incEditCount();
1549                                         $dbw->commit();
1550                                 }
1551                         } else {
1552                                 $status->warning( 'edit-no-change' );
1553                                 $revision = null;
1554                                 // Keep the same revision ID, but do some updates on it
1555                                 $revisionId = $this->getRevIdFetched();
1556                                 // Update page_touched, this is usually implicit in the page update
1557                                 // Other cache updates are done in onArticleEdit()
1558                                 $this->mTitle->invalidateCache();
1559                         }
1560
1561                         if( !$wgDBtransactions ) {
1562                                 ignore_user_abort( $userAbort );
1563                         }
1564                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1565                         if( !$status->isOK() ) {
1566                                 wfProfileOut( __METHOD__ );
1567                                 return $status;
1568                         }
1569
1570                         # Invalidate cache of this article and all pages using this article
1571                         # as a template. Partly deferred. Leave templatelinks for editUpdates().
1572                         Article::onArticleEdit( $this->mTitle, 'skiptransclusions' );
1573                         # Update links tables, site stats, etc.
1574                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1575                 } else {
1576                         # Create new article
1577                         $status->value['new'] = true;
1578
1579                         # Set statistics members
1580                         # We work out if it's countable after PST to avoid counter drift
1581                         # when articles are created with {{subst:}}
1582                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1583                         $this->mTotalAdjustment = 1;
1584
1585                         $dbw->begin();
1586
1587                         # Add the page record; stake our claim on this title!
1588                         # This will return false if the article already exists
1589                         $newid = $this->insertOn( $dbw );
1590
1591                         if( $newid === false ) {
1592                                 $dbw->rollback();
1593                                 $status->fatal( 'edit-already-exists' );
1594                                 wfProfileOut( __METHOD__ );
1595                                 return $status;
1596                         }
1597
1598                         # Save the revision text...
1599                         $revision = new Revision( array(
1600                                 'page'       => $newid,
1601                                 'comment'    => $summary,
1602                                 'minor_edit' => $isminor,
1603                                 'text'       => $text,
1604                                 'user'       => $user->getId(),
1605                                 'user_text'  => $user->getName(),
1606                                 ) );
1607                         $revisionId = $revision->insertOn( $dbw );
1608
1609                         $this->mTitle->resetArticleID( $newid );
1610
1611                         # Update the page record with revision data
1612                         $this->updateRevisionOn( $dbw, $revision, 0 );
1613
1614                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $user) );
1615                         # Update recentchanges
1616                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1617                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1618                                 # Mark as patrolled if the user can do so
1619                                 $patrolled = ($wgUseRCPatrol || $wgUseNPPatrol) && $user->isAllowed('autopatrol');
1620                                 # Add RC row to the DB
1621                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1622                                         '', strlen($text), $revisionId, $patrolled );
1623                                 # Log auto-patrolled edits
1624                                 if( $patrolled ) {
1625                                         PatrolLog::record( $rc, true );
1626                                 }
1627                         }
1628                         $user->incEditCount();
1629                         $dbw->commit();
1630
1631                         # Update links, etc.
1632                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1633
1634                         # Clear caches
1635                         Article::onArticleCreate( $this->mTitle );
1636
1637                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1638                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1639                 }
1640
1641                 # Do updates right now unless deferral was requested
1642                 if( !( $flags & EDIT_DEFER_UPDATES ) ) {
1643                         wfDoUpdates();
1644                 }
1645
1646                 // Return the new revision (or null) to the caller
1647                 $status->value['revision'] = $revision;
1648
1649                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1650                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status ) );
1651
1652                 wfProfileOut( __METHOD__ );
1653                 return $status;
1654         }
1655
1656         /**
1657          * @deprecated wrapper for doRedirect
1658          */
1659         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1660                 wfDeprecated( __METHOD__ );
1661                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1662         }
1663
1664         /**
1665          * Output a redirect back to the article.
1666          * This is typically used after an edit.
1667          *
1668          * @param boolean $noRedir Add redirect=no
1669          * @param string $sectionAnchor section to redirect to, including "#"
1670          * @param string $extraQuery, extra query params
1671          */
1672         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1673                 global $wgOut;
1674                 if( $noRedir ) {
1675                         $query = 'redirect=no';
1676                         if( $extraQuery )
1677                                 $query .= "&$query";
1678                 } else {
1679                         $query = $extraQuery;
1680                 }
1681                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1682         }
1683
1684         /**
1685          * Mark this particular edit/page as patrolled
1686          */
1687         public function markpatrolled() {
1688                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
1689                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1690
1691                 # If we haven't been given an rc_id value, we can't do anything
1692                 $rcid = (int) $wgRequest->getVal('rcid');
1693                 $rc = RecentChange::newFromId($rcid);
1694                 if( is_null($rc) ) {
1695                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1696                         return;
1697                 }
1698
1699                 #It would be nice to see where the user had actually come from, but for now just guess
1700                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
1701                 $return = Title::makeTitle( NS_SPECIAL, $returnto );
1702
1703                 $dbw = wfGetDB( DB_MASTER );
1704                 $errors = $rc->doMarkPatrolled();
1705
1706                 if( in_array(array('rcpatroldisabled'), $errors) ) {
1707                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1708                         return;
1709                 }
1710
1711                 if( in_array(array('hookaborted'), $errors) ) {
1712                         // The hook itself has handled any output
1713                         return;
1714                 }
1715
1716                 if( in_array(array('markedaspatrollederror-noautopatrol'), $errors) ) {
1717                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1718                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
1719                         $wgOut->returnToMain( false, $return );
1720                         return;
1721                 }
1722
1723                 if( !empty($errors) ) {
1724                         $wgOut->showPermissionsErrorPage( $errors );
1725                         return;
1726                 }
1727
1728                 # Inform the user
1729                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1730                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
1731                 $wgOut->returnToMain( false, $return );
1732         }
1733
1734         /**
1735          * User-interface handler for the "watch" action
1736          */
1737
1738         public function watch() {
1739                 global $wgUser, $wgOut;
1740                 if( $wgUser->isAnon() ) {
1741                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1742                         return;
1743                 }
1744                 if( wfReadOnly() ) {
1745                         $wgOut->readOnlyPage();
1746                         return;
1747                 }
1748                 if( $this->doWatch() ) {
1749                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1750                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1751                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
1752                 }
1753                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1754         }
1755
1756         /**
1757          * Add this page to $wgUser's watchlist
1758          * @return bool true on successful watch operation
1759          */
1760         public function doWatch() {
1761                 global $wgUser;
1762                 if( $wgUser->isAnon() ) {
1763                         return false;
1764                 }
1765                 if( wfRunHooks('WatchArticle', array(&$wgUser, &$this)) ) {
1766                         $wgUser->addWatch( $this->mTitle );
1767                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1768                 }
1769                 return false;
1770         }
1771
1772         /**
1773          * User interface handler for the "unwatch" action.
1774          */
1775         public function unwatch() {
1776                 global $wgUser, $wgOut;
1777                 if( $wgUser->isAnon() ) {
1778                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1779                         return;
1780                 }
1781                 if( wfReadOnly() ) {
1782                         $wgOut->readOnlyPage();
1783                         return;
1784                 }
1785                 if( $this->doUnwatch() ) {
1786                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1787                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1788                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
1789                 }
1790                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1791         }
1792
1793         /**
1794          * Stop watching a page
1795          * @return bool true on successful unwatch
1796          */
1797         public function doUnwatch() {
1798                 global $wgUser;
1799                 if( $wgUser->isAnon() ) {
1800                         return false;
1801                 }
1802                 if( wfRunHooks('UnwatchArticle', array(&$wgUser, &$this)) ) {
1803                         $wgUser->removeWatch( $this->mTitle );
1804                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1805                 }
1806                 return false;
1807         }
1808
1809         /**
1810          * action=protect handler
1811          */
1812         public function protect() {
1813                 $form = new ProtectionForm( $this );
1814                 $form->execute();
1815         }
1816
1817         /**
1818          * action=unprotect handler (alias)
1819          */
1820         public function unprotect() {
1821                 $this->protect();
1822         }
1823
1824         /**
1825          * Update the article's restriction field, and leave a log entry.
1826          *
1827          * @param array $limit set of restriction keys
1828          * @param string $reason
1829          * @return bool true on success
1830          */
1831         public function updateRestrictions( $limit = array(), $reason = '', $cascade = 0, $expiry = array() ) {
1832                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1833
1834                 $id = $this->mTitle->getArticleID();
1835                 if( array() != $this->mTitle->getUserPermissionsErrors( 'protect', $wgUser ) || wfReadOnly() || $id == 0 ) {
1836                         return false;
1837                 }
1838
1839                 if( !$cascade ) {
1840                         $cascade = false;
1841                 }
1842
1843                 // Take this opportunity to purge out expired restrictions
1844                 Title::purgeExpiredRestrictions();
1845
1846                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1847                 # we expect a single selection, but the schema allows otherwise.
1848                 $current = array();
1849                 $updated = Article::flattenRestrictions( $limit );
1850                 $changed = false;
1851                 foreach( $wgRestrictionTypes as $action ) {
1852                         $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1853                         $changed = ($changed || ($this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action]) );
1854                 }
1855
1856                 $current = Article::flattenRestrictions( $current );
1857
1858                 $changed = ($changed || ( $current != $updated ) );
1859                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
1860                 $protect = ( $updated != '' );
1861
1862                 # If nothing's changed, do nothing
1863                 if( $changed ) {
1864                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1865
1866                                 $dbw = wfGetDB( DB_MASTER );
1867
1868                                 # Prepare a null revision to be added to the history
1869                                 $modified = $current != '' && $protect;
1870                                 if( $protect ) {
1871                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1872                                 } else {
1873                                         $comment_type = 'unprotectedarticle';
1874                                 }
1875                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1876
1877                                 # Only restrictions with the 'protect' right can cascade...
1878                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1879                                 foreach( $limit as $action => $restriction ) {
1880                                         # FIXME: can $restriction be an array or what? (same as fixme above)
1881                                         if( $restriction != 'protect' && $restriction != 'sysop' ) {
1882                                                 $cascade = false;
1883                                                 break;
1884                                         }
1885                                 }
1886                                 $cascade_description = '';
1887                                 if( $cascade ) {
1888                                         $cascade_description = ' ['.wfMsgForContent('protect-summary-cascade').']';
1889                                 }
1890
1891                                 if( $reason )
1892                                         $comment .= ": $reason";
1893
1894                                 $editComment = $comment;
1895                                 $encodedExpiry = array();
1896                                 $protect_description = '';
1897                                 foreach( $limit as $action => $restrictions  ) {
1898                                         $encodedExpiry[$action] = Block::encodeExpiry($expiry[$action], $dbw );
1899                                         if( $restrictions != '' ) {
1900                                                 $protect_description .= "[$action=$restrictions] (";
1901                                                 if( $encodedExpiry[$action] != 'infinity' ) {
1902                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
1903                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) );
1904                                                 } else {
1905                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
1906                                                 }
1907                                                 $protect_description .= ') ';
1908                                         }
1909                                 }
1910                                 $protect_description = trim($protect_description);
1911
1912                                 if( $protect_description && $protect )
1913                                         $editComment .= " ($protect_description)";
1914                                 if( $cascade )
1915                                         $editComment .= "$cascade_description";
1916                                 # Update restrictions table
1917                                 foreach( $limit as $action => $restrictions ) {
1918                                         if($restrictions != '' ) {
1919                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
1920                                                         array( 'pr_page' => $id,
1921                                                                 'pr_type' => $action,
1922                                                                 'pr_level' => $restrictions,
1923                                                                 'pr_cascade' => ($cascade && $action == 'edit') ? 1 : 0,
1924                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
1925                                         } else {
1926                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1927                                                         'pr_type' => $action ), __METHOD__ );
1928                                         }
1929                                 }
1930
1931                                 # Insert a null revision
1932                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1933                                 $nullRevId = $nullRevision->insertOn( $dbw );
1934
1935                                 $latest = $this->getLatest();
1936                                 # Update page record
1937                                 $dbw->update( 'page',
1938                                         array( /* SET */
1939                                                 'page_touched' => $dbw->timestamp(),
1940                                                 'page_restrictions' => '',
1941                                                 'page_latest' => $nullRevId
1942                                         ), array( /* WHERE */
1943                                                 'page_id' => $id
1944                                         ), 'Article::protect'
1945                                 );
1946
1947                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $nullRevision, $latest, $wgUser) );
1948                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1949
1950                                 # Update the protection log
1951                                 $log = new LogPage( 'protect' );
1952                                 if( $protect ) {
1953                                         $params = array($protect_description,$cascade ? 'cascade' : '');
1954                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason), $params );
1955                                 } else {
1956                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1957                                 }
1958
1959                         } # End hook
1960                 } # End "changed" check
1961
1962                 return true;
1963         }
1964
1965         /**
1966          * Take an array of page restrictions and flatten it to a string
1967          * suitable for insertion into the page_restrictions field.
1968          * @param array $limit
1969          * @return string
1970          */
1971         protected static function flattenRestrictions( $limit ) {
1972                 if( !is_array( $limit ) ) {
1973                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
1974                 }
1975                 $bits = array();
1976                 ksort( $limit );
1977                 foreach( $limit as $action => $restrictions ) {
1978                         if( $restrictions != '' ) {
1979                                 $bits[] = "$action=$restrictions";
1980                         }
1981                 }
1982                 return implode( ':', $bits );
1983         }
1984
1985         /**
1986          * Auto-generates a deletion reason
1987          * @param bool &$hasHistory Whether the page has a history
1988          */
1989         public function generateReason( &$hasHistory ) {
1990                 global $wgContLang;
1991                 $dbw = wfGetDB( DB_MASTER );
1992                 // Get the last revision
1993                 $rev = Revision::newFromTitle( $this->mTitle );
1994                 if( is_null( $rev ) )
1995                         return false;
1996
1997                 // Get the article's contents
1998                 $contents = $rev->getText();
1999                 $blank = false;
2000                 // If the page is blank, use the text from the previous revision,
2001                 // which can only be blank if there's a move/import/protect dummy revision involved
2002                 if( $contents == '' ) {
2003                         $prev = $rev->getPrevious();
2004                         if( $prev )     {
2005                                 $contents = $prev->getText();
2006                                 $blank = true;
2007                         }
2008                 }
2009
2010                 // Find out if there was only one contributor
2011                 // Only scan the last 20 revisions
2012                 $limit = 20;
2013                 $res = $dbw->select( 'revision', 'rev_user_text',
2014                         array( 'rev_page' => $this->getID() ), __METHOD__,
2015                         array( 'LIMIT' => $limit )
2016                 );
2017                 if( $res === false )
2018                         // This page has no revisions, which is very weird
2019                         return false;
2020                 if( $res->numRows() > 1 )
2021                                 $hasHistory = true;
2022                 else
2023                                 $hasHistory = false;
2024                 $row = $dbw->fetchObject( $res );
2025                 $onlyAuthor = $row->rev_user_text;
2026                 // Try to find a second contributor
2027                 foreach( $res as $row ) {
2028                         if( $row->rev_user_text != $onlyAuthor ) {
2029                                 $onlyAuthor = false;
2030                                 break;
2031                         }
2032                 }
2033                 $dbw->freeResult( $res );
2034
2035                 // Generate the summary with a '$1' placeholder
2036                 if( $blank ) {
2037                         // The current revision is blank and the one before is also
2038                         // blank. It's just not our lucky day
2039                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2040                 } else {
2041                         if( $onlyAuthor )
2042                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2043                         else
2044                                 $reason = wfMsgForContent( 'excontent', '$1' );
2045                 }
2046
2047                 // Replace newlines with spaces to prevent uglyness
2048                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2049                 // Calculate the maximum amount of chars to get
2050                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2051                 $maxLength = 255 - (strlen( $reason ) - 2) - 3;
2052                 $contents = $wgContLang->truncate( $contents, $maxLength, '...' );
2053                 // Remove possible unfinished links
2054                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2055                 // Now replace the '$1' placeholder
2056                 $reason = str_replace( '$1', $contents, $reason );
2057                 return $reason;
2058         }
2059
2060
2061         /*
2062          * UI entry point for page deletion
2063          */
2064         public function delete() {
2065                 global $wgUser, $wgOut, $wgRequest;
2066
2067                 $confirm = $wgRequest->wasPosted() &&
2068                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2069
2070                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2071                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2072
2073                 $reason = $this->DeleteReasonList;
2074
2075                 if( $reason != 'other' && $this->DeleteReason != '') {
2076                         // Entry from drop down menu + additional comment
2077                         $reason .= ': ' . $this->DeleteReason;
2078                 } elseif( $reason == 'other' ) {
2079                         $reason = $this->DeleteReason;
2080                 }
2081                 # Flag to hide all contents of the archived revisions
2082                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed('suppressrevision');
2083
2084                 # This code desperately needs to be totally rewritten
2085
2086                 # Read-only check...
2087                 if( wfReadOnly() ) {
2088                         $wgOut->readOnlyPage();
2089                         return;
2090                 }
2091
2092                 # Check permissions
2093                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2094
2095                 if(count($permission_errors)>0) {
2096                         $wgOut->showPermissionsErrorPage( $permission_errors );
2097                         return;
2098                 }
2099
2100                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2101
2102                 # Better double-check that it hasn't been deleted yet!
2103                 $dbw = wfGetDB( DB_MASTER );
2104                 $conds = $this->mTitle->pageCond();
2105                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2106                 if( $latest === false ) {
2107                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
2108                         return;
2109                 }
2110
2111                 # Hack for big sites
2112                 $bigHistory = $this->isBigDeletion();
2113                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2114                         global $wgLang, $wgDeleteRevisionsLimit;
2115                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2116                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2117                         return;
2118                 }
2119
2120                 if( $confirm ) {
2121                         $this->doDelete( $reason, $suppress );
2122                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2123                                 $this->doWatch();
2124                         } elseif( $this->mTitle->userIsWatching() ) {
2125                                 $this->doUnwatch();
2126                         }
2127                         return;
2128                 }
2129
2130                 // Generate deletion reason
2131                 $hasHistory = false;
2132                 if( !$reason ) $reason = $this->generateReason($hasHistory);
2133
2134                 // If the page has a history, insert a warning
2135                 if( $hasHistory && !$confirm ) {
2136                         $skin=$wgUser->getSkin();
2137                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
2138                         if( $bigHistory ) {
2139                                 global $wgLang, $wgDeleteRevisionsLimit;
2140                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2141                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2142                         }
2143                 }
2144
2145                 return $this->confirmDelete( $reason );
2146         }
2147
2148         /**
2149          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2150          */
2151         public function isBigDeletion() {
2152                 global $wgDeleteRevisionsLimit;
2153                 if( $wgDeleteRevisionsLimit ) {
2154                         $revCount = $this->estimateRevisionCount();
2155                         return $revCount > $wgDeleteRevisionsLimit;
2156                 }
2157                 return false;
2158         }
2159
2160         /**
2161          * @return int approximate revision count
2162          */
2163         public function estimateRevisionCount() {
2164                 $dbr = wfGetDB( DB_SLAVE );
2165                 // For an exact count...
2166                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2167                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2168                 return $dbr->estimateRowCount( 'revision', '*',
2169                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2170         }
2171
2172         /**
2173          * Get the last N authors
2174          * @param int $num Number of revisions to get
2175          * @param string $revLatest The latest rev_id, selected from the master (optional)
2176          * @return array Array of authors, duplicates not removed
2177          */
2178         public function getLastNAuthors( $num, $revLatest = 0 ) {
2179                 wfProfileIn( __METHOD__ );
2180                 // First try the slave
2181                 // If that doesn't have the latest revision, try the master
2182                 $continue = 2;
2183                 $db = wfGetDB( DB_SLAVE );
2184                 do {
2185                         $res = $db->select( array( 'page', 'revision' ),
2186                                 array( 'rev_id', 'rev_user_text' ),
2187                                 array(
2188                                         'page_namespace' => $this->mTitle->getNamespace(),
2189                                         'page_title' => $this->mTitle->getDBkey(),
2190                                         'rev_page = page_id'
2191                                 ), __METHOD__, $this->getSelectOptions( array(
2192                                         'ORDER BY' => 'rev_timestamp DESC',
2193                                         'LIMIT' => $num
2194                                 ) )
2195                         );
2196                         if( !$res ) {
2197                                 wfProfileOut( __METHOD__ );
2198                                 return array();
2199                         }
2200                         $row = $db->fetchObject( $res );
2201                         if( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2202                                 $db = wfGetDB( DB_MASTER );
2203                                 $continue--;
2204                         } else {
2205                                 $continue = 0;
2206                         }
2207                 } while ( $continue );
2208
2209                 $authors = array( $row->rev_user_text );
2210                 while ( $row = $db->fetchObject( $res ) ) {
2211                         $authors[] = $row->rev_user_text;
2212                 }
2213                 wfProfileOut( __METHOD__ );
2214                 return $authors;
2215         }
2216
2217         /**
2218          * Output deletion confirmation dialog
2219          * @param $reason string Prefilled reason
2220          */
2221         public function confirmDelete( $reason ) {
2222                 global $wgOut, $wgUser;
2223
2224                 wfDebug( "Article::confirmDelete\n" );
2225
2226                 $wgOut->setSubtitle( wfMsg( 'delete-backlink', $wgUser->getSkin()->makeKnownLinkObj( $this->mTitle ) ) );
2227                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2228                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2229
2230                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
2231                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2232                                         <td></td>
2233                                         <td class='mw-input'>" .
2234                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2235                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2236                                         "</td>
2237                                 </tr>";
2238                 } else {
2239                         $suppress = '';
2240                 }
2241                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2242
2243                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2244                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2245                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2246                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2247                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2248                         "<tr id=\"wpDeleteReasonListRow\">
2249                                 <td class='mw-label'>" .
2250                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2251                                 "</td>
2252                                 <td class='mw-input'>" .
2253                                         Xml::listDropDown( 'wpDeleteReasonList',
2254                                                 wfMsgForContent( 'deletereason-dropdown' ),
2255                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2256                                 "</td>
2257                         </tr>
2258                         <tr id=\"wpDeleteReasonRow\">
2259                                 <td class='mw-label'>" .
2260                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2261                                 "</td>
2262                                 <td class='mw-input'>" .
2263                                         Xml::input( 'wpReason', 60, $reason, array( 'type' => 'text', 'maxlength' => '255',
2264                                                 'tabindex' => '2', 'id' => 'wpReason' ) ) .
2265                                 "</td>
2266                         </tr>
2267                         <tr>
2268                                 <td></td>
2269                                 <td class='mw-input'>" .
2270                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2271                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2272                                 "</td>
2273                         </tr>
2274                         $suppress
2275                         <tr>
2276                                 <td></td>
2277                                 <td class='mw-submit'>" .
2278                                         Xml::submitButton( wfMsg( 'deletepage' ),
2279                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2280                                 "</td>
2281                         </tr>" .
2282                         Xml::closeElement( 'table' ) .
2283                         Xml::closeElement( 'fieldset' ) .
2284                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2285                         Xml::closeElement( 'form' );
2286
2287                         if( $wgUser->isAllowed( 'editinterface' ) ) {
2288                                 $skin = $wgUser->getSkin();
2289                                 $link = $skin->makeLink ( 'MediaWiki:Deletereason-dropdown', wfMsgHtml( 'delete-edit-reasonlist' ) );
2290                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2291                         }
2292
2293                 $wgOut->addHTML( $form );
2294                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2295         }
2296
2297
2298         /**
2299          * Show relevant lines from the deletion log
2300          */
2301         public function showLogExtract( $out ) {
2302                 wfDeprecated( __METHOD__ );
2303                 $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2304                 LogEventsList::showLogExtract( $out, 'delete', $this->mTitle->getPrefixedText() );
2305         }
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 string $fromP - Name of the user whose edits to rollback.
2481          * @param string $summary - Custom summary. Set to default summary if empty.
2482          * @param string $token - Rollback token.
2483          * @param bool   $bot - If true, mark all reverted edits as bot.
2484          *
2485          * @param array $resultDetails 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                 $errors = array_merge( $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser ),
2500                         $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser ) );
2501                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2502                         $errors[] = array( 'sessionfailure' );
2503
2504                 if( $wgUser->pingLimiter('rollback') || $wgUser->pingLimiter() ) {
2505                         $errors[] = array( 'actionthrottledtext' );
2506                 }
2507                 # If there were errors, bail out now
2508                 if(!empty($errors))
2509                         return $errors;
2510
2511                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
2512         }
2513
2514         /**
2515          * Backend implementation of doRollback(), please refer there for parameter
2516          * and return value documentation
2517          *
2518          * NOTE: This function does NOT check ANY permissions, it just commits the
2519          * rollback to the DB Therefore, you should only call this function direct-
2520          * ly if you want to use custom permissions checks. If you don't, use
2521          * doRollback() instead.
2522          */
2523         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
2524                 global $wgUseRCPatrol, $wgUser, $wgLang;
2525                 $dbw = wfGetDB( DB_MASTER );
2526
2527                 if( wfReadOnly() ) {
2528                         return array( array( 'readonlytext' ) );
2529                 }
2530
2531                 # Get the last editor
2532                 $current = Revision::newFromTitle( $this->mTitle );
2533                 if( is_null( $current ) ) {
2534                         # Something wrong... no page?
2535                         return array(array('notanarticle'));
2536                 }
2537
2538                 $from = str_replace( '_', ' ', $fromP );
2539                 if( $from != $current->getUserText() ) {
2540                         $resultDetails = array( 'current' => $current );
2541                         return array(array('alreadyrolled',
2542                                 htmlspecialchars($this->mTitle->getPrefixedText()),
2543                                 htmlspecialchars($fromP),
2544                                 htmlspecialchars($current->getUserText())
2545                         ));
2546                 }
2547
2548                 # Get the last edit not by this guy
2549                 $user = intval( $current->getUser() );
2550                 $user_text = $dbw->addQuotes( $current->getUserText() );
2551                 $s = $dbw->selectRow( 'revision',
2552                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2553                         array(  'rev_page' => $current->getPage(),
2554                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2555                         ), __METHOD__,
2556                         array(  'USE INDEX' => 'page_timestamp',
2557                                 'ORDER BY'  => 'rev_timestamp DESC' )
2558                         );
2559                 if( $s === false ) {
2560                         # No one else ever edited this page
2561                         return array(array('cantrollback'));
2562                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
2563                         # Only admins can see this text
2564                         return array(array('notvisiblerev'));
2565                 }
2566
2567                 $set = array();
2568                 if( $bot && $wgUser->isAllowed('markbotedits') ) {
2569                         # Mark all reverted edits as bot
2570                         $set['rc_bot'] = 1;
2571                 }
2572                 if( $wgUseRCPatrol ) {
2573                         # Mark all reverted edits as patrolled
2574                         $set['rc_patrolled'] = 1;
2575                 }
2576
2577                 if( $set ) {
2578                         $dbw->update( 'recentchanges', $set,
2579                                         array( /* WHERE */
2580                                                 'rc_cur_id' => $current->getPage(),
2581                                                 'rc_user_text' => $current->getUserText(),
2582                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2583                                         ), __METHOD__
2584                                 );
2585                 }
2586
2587                 # Generate the edit summary if necessary
2588                 $target = Revision::newFromId( $s->rev_id );
2589                 if( empty( $summary ) ){
2590                         $summary = wfMsgForContent( 'revertpage' );
2591                 }
2592
2593                 # Allow the custom summary to use the same args as the default message
2594                 $args = array(
2595                         $target->getUserText(), $from, $s->rev_id,
2596                         $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
2597                         $current->getId(), $wgLang->timeanddate($current->getTimestamp())
2598                 );
2599                 $summary = wfMsgReplaceArgs( $summary, $args );
2600
2601                 # Save
2602                 $flags = EDIT_UPDATE;
2603
2604                 if( $wgUser->isAllowed('minoredit') )
2605                         $flags |= EDIT_MINOR;
2606
2607                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
2608                         $flags |= EDIT_FORCE_BOT;
2609                 # Actually store the edit
2610                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
2611                 if( !empty( $status->value['revision'] ) ) {
2612                         $revId = $status->value['revision']->getId();
2613                 } else {
2614                         $revId = false;
2615                 }
2616
2617                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target ) );
2618
2619                 $resultDetails = array(
2620                         'summary' => $summary,
2621                         'current' => $current,
2622                         'target' => $target,
2623                         'newid' => $revId
2624                 );
2625                 return array();
2626         }
2627
2628         /**
2629          * User interface for rollback operations
2630          */
2631         public function rollback() {
2632                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2633                 $details = null;
2634
2635                 $result = $this->doRollback(
2636                         $wgRequest->getVal( 'from' ),
2637                         $wgRequest->getText( 'summary' ),
2638                         $wgRequest->getVal( 'token' ),
2639                         $wgRequest->getBool( 'bot' ),
2640                         $details
2641                 );
2642
2643                 if( in_array( array( 'blocked' ), $result ) ) {
2644                         $wgOut->blockedPage();
2645                         return;
2646                 }
2647                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
2648                         $wgOut->rateLimited();
2649                         return;
2650                 }
2651                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
2652                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2653                         $errArray = $result[0];
2654                         $errMsg = array_shift( $errArray );
2655                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
2656                         if( isset( $details['current'] ) ){
2657                                 $current = $details['current'];
2658                                 if( $current->getComment() != '' ) {
2659                                         $wgOut->addWikiMsgArray( 'editcomment', array(
2660                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
2661                                 }
2662                         }
2663                         return;
2664                 }
2665                 # Display permissions errors before read-only message -- there's no
2666                 # point in misleading the user into thinking the inability to rollback
2667                 # is only temporary.
2668                 if( !empty($result) && $result !== array( array('readonlytext') ) ) {
2669                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
2670                         # move any 'readonlytext' error manually.
2671                         $out = array();
2672                         foreach( $result as $error ) {
2673                                 if( $error != array( 'readonlytext' ) ) {
2674                                         $out []= $error;
2675                                 }
2676                         }
2677                         $wgOut->showPermissionsErrorPage( $out );
2678                         return;
2679                 }
2680                 if( $result == array( array('readonlytext') ) ) {
2681                         $wgOut->readOnlyPage();
2682                         return;
2683                 }
2684
2685                 $current = $details['current'];
2686                 $target = $details['target'];
2687                 $newId = $details['newid'];
2688                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2689                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2690                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2691                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2692                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2693                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2694                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2695                 $wgOut->returnToMain( false, $this->mTitle );
2696
2697                 if( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
2698                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
2699                         $de->showDiff( '', '' );
2700                 }
2701         }
2702
2703
2704         /**
2705          * Do standard deferred updates after page view
2706          */
2707         protected function viewUpdates() {
2708                 global $wgDeferredUpdateList, $wgUser;
2709                 if( 0 != $this->getID() ) {
2710                         # Don't update page view counters on views from bot users (bug 14044)
2711                         global $wgDisableCounters;
2712                         if( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) ) {
2713                                 Article::incViewCount( $this->getID() );
2714                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2715                                 array_push( $wgDeferredUpdateList, $u );
2716                         }
2717                 }
2718                 # Update newtalk / watchlist notification status
2719                 $wgUser->clearNotification( $this->mTitle );
2720         }
2721
2722         /**
2723          * Prepare text which is about to be saved.
2724          * Returns a stdclass with source, pst and output members
2725          */
2726         public function prepareTextForEdit( $text, $revid=null ) {
2727                 if( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
2728                         // Already prepared
2729                         return $this->mPreparedEdit;
2730                 }
2731                 global $wgParser;
2732                 $edit = (object)array();
2733                 $edit->revid = $revid;
2734                 $edit->newText = $text;
2735                 $edit->pst = $this->preSaveTransform( $text );
2736                 $options = new ParserOptions;
2737                 $options->setTidy( true );
2738                 $options->enableLimitReport();
2739                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
2740                 $edit->oldText = $this->getContent();
2741                 $this->mPreparedEdit = $edit;
2742                 return $edit;
2743         }
2744
2745         /**
2746          * Do standard deferred updates after page edit.
2747          * Update links tables, site stats, search index and message cache.
2748          * Purges pages that include this page if the text was changed here.
2749          * Every 100th edit, prune the recent changes table.
2750          *
2751          * @private
2752          * @param $text New text of the article
2753          * @param $summary Edit summary
2754          * @param $minoredit Minor edit
2755          * @param $timestamp_of_pagechange Timestamp associated with the page change
2756          * @param $newid rev_id value of the new revision
2757          * @param $changed Whether or not the content actually changed
2758          */
2759         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2760                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
2761
2762                 wfProfileIn( __METHOD__ );
2763
2764                 # Parse the text
2765                 # Be careful not to double-PST: $text is usually already PST-ed once
2766                 if( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2767                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2768                         $editInfo = $this->prepareTextForEdit( $text, $newid );
2769                 } else {
2770                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2771                         $editInfo = $this->mPreparedEdit;
2772                 }
2773
2774                 # Save it to the parser cache
2775                 if( $wgEnableParserCache ) {
2776                         $parserCache = ParserCache::singleton();
2777                         $parserCache->save( $editInfo->output, $this, $wgUser );
2778                 }
2779
2780                 # Update the links tables
2781                 $u = new LinksUpdate( $this->mTitle, $editInfo->output, false );
2782                 $u->setRecursiveTouch( $changed ); // refresh/invalidate including pages too
2783                 $u->doUpdate();
2784
2785                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
2786
2787                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2788                         if( 0 == mt_rand( 0, 99 ) ) {
2789                                 // Flush old entries from the `recentchanges` table; we do this on
2790                                 // random requests so as to avoid an increase in writes for no good reason
2791                                 global $wgRCMaxAge;
2792                                 $dbw = wfGetDB( DB_MASTER );
2793                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2794                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2795                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2796                                 $dbw->query( $sql );
2797                         }
2798                 }
2799
2800                 $id = $this->getID();
2801                 $title = $this->mTitle->getPrefixedDBkey();
2802                 $shortTitle = $this->mTitle->getDBkey();
2803
2804                 if( 0 == $id ) {
2805                         wfProfileOut( __METHOD__ );
2806                         return;
2807                 }
2808
2809                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2810                 array_push( $wgDeferredUpdateList, $u );
2811                 $u = new SearchUpdate( $id, $title, $text );
2812                 array_push( $wgDeferredUpdateList, $u );
2813
2814                 # If this is another user's talk page, update newtalk
2815                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2816                 # load of user talk pages and piss people off, nor if it's a minor edit
2817                 # by a properly-flagged bot.
2818                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2819                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
2820                         if( wfRunHooks('ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2821                                 $other = User::newFromName( $shortTitle, false );
2822                                 if( !$other ) {
2823                                         wfDebug( __METHOD__.": invalid username\n" );
2824                                 } elseif( User::isIP( $shortTitle ) ) {
2825                                         // An anonymous user
2826                                         $other->setNewtalk( true );
2827                                 } elseif( $other->isLoggedIn() ) {
2828                                         $other->setNewtalk( true );
2829                                 } else {
2830                                         wfDebug( __METHOD__. ": don't need to notify a nonexistent user\n" );
2831                                 }
2832                         }
2833                 }
2834
2835                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2836                         $wgMessageCache->replace( $shortTitle, $text );
2837                 }
2838
2839                 wfProfileOut( __METHOD__ );
2840         }
2841
2842         /**
2843          * Perform article updates on a special page creation.
2844          *
2845          * @param Revision $rev
2846          *
2847          * @todo This is a shitty interface function. Kill it and replace the
2848          * other shitty functions like editUpdates and such so it's not needed
2849          * anymore.
2850          */
2851         public function createUpdates( $rev ) {
2852                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2853                 $this->mTotalAdjustment = 1;
2854                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2855                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2856         }
2857
2858         /**
2859          * Generate the navigation links when browsing through an article revisions
2860          * It shows the information as:
2861          *   Revision as of \<date\>; view current revision
2862          *   \<- Previous version | Next Version -\>
2863          *
2864          * @param string $oldid         Revision ID of this article revision
2865          */
2866         protected function setOldSubtitle( $oldid=0 ) {
2867                 global $wgLang, $wgOut, $wgUser;
2868
2869                 if( !wfRunHooks( 'DisplayOldSubtitle', array(&$this, &$oldid) ) ) {
2870                         return;
2871                 }
2872
2873                 $revision = Revision::newFromId( $oldid );
2874
2875                 $current = ( $oldid == $this->mLatest );
2876                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2877                 $sk = $wgUser->getSkin();
2878                 $lnk = $current
2879                         ? wfMsg( 'currentrevisionlink' )
2880                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2881                 $curdiff = $current
2882                         ? wfMsg( 'diff' )
2883                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=cur&oldid='.$oldid );
2884                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2885                 $prevlink = $prev
2886                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2887                         : wfMsg( 'previousrevision' );
2888                 $prevdiff = $prev
2889                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=prev&oldid='.$oldid )
2890                         : wfMsg( 'diff' );
2891                 $nextlink = $current
2892                         ? wfMsg( 'nextrevision' )
2893                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2894                 $nextdiff = $current
2895                         ? wfMsg( 'diff' )
2896                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=next&oldid='.$oldid );
2897
2898                 $cdel='';
2899                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
2900                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
2901                         if( $revision->isCurrent() ) {
2902                         // We don't handle top deleted edits too well
2903                                 $cdel = wfMsgHtml('rev-delundel');
2904                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
2905                         // If revision was hidden from sysops
2906                                 $cdel = wfMsgHtml('rev-delundel');
2907                         } else {
2908                                 $cdel = $sk->makeKnownLinkObj( $revdel,
2909                                         wfMsgHtml('rev-delundel'),
2910                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
2911                                         '&oldid=' . urlencode( $oldid ) );
2912                                 // Bolden oversighted content
2913                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
2914                                         $cdel = "<strong>$cdel</strong>";
2915                         }
2916                         $cdel = "(<small>$cdel</small>) ";
2917                 }
2918                 # Show user links if allowed to see them. Normally they
2919                 # are hidden regardless, but since we can already see the text here...
2920                 $userlinks = $sk->revUserTools( $revision, false );
2921
2922                 $m = wfMsg( 'revision-info-current' );
2923                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
2924                         ? 'revision-info-current'
2925                         : 'revision-info';
2926
2927                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsg( $infomsg, $td, $userlinks, $revision->getID() ) . "</div>\n" .
2928
2929                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsg( 'revision-nav', $prevdiff,
2930                                 $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
2931                 $wgOut->setSubtitle( $r );
2932         }
2933
2934         /**
2935          * This function is called right before saving the wikitext,
2936          * so we can do things like signatures and links-in-context.
2937          *
2938          * @param string $text
2939          */
2940         public function preSaveTransform( $text ) {
2941                 global $wgParser, $wgUser;
2942                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2943         }
2944
2945         /* Caching functions */
2946
2947         /**
2948          * checkLastModified returns true if it has taken care of all
2949          * output to the client that is necessary for this request.
2950          * (that is, it has sent a cached version of the page)
2951          */
2952         protected function tryFileCache() {
2953                 static $called = false;
2954                 if( $called ) {
2955                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2956                         return false;
2957                 }
2958                 $called = true;
2959                 if( $this->isFileCacheable() ) {
2960                         $touched = $this->mTouched;
2961                         $cache = new HTMLFileCache( $this->mTitle );
2962                         if( $cache->isFileCacheGood( $touched ) ) {
2963                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2964                                 $cache->loadFromFileCache();
2965                                 return true;
2966                         } else {
2967                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2968                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2969                         }
2970                 } else {
2971                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2972                 }
2973                 return false;
2974         }
2975
2976         /**
2977          * Check if the page can be cached
2978          * @return bool
2979          */
2980         public function isFileCacheable() {
2981                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest, $wgLang, $wgContLang;
2982                 // Get all query values
2983                 $queryVals = $wgRequest->getValues();
2984                 foreach( $queryVals as $query => $val ) {
2985                         if( $query == 'title' || ($query == 'action' && $val == 'view') ) {
2986                                 // Normal page view in query form
2987                         } else {
2988                                 return false;
2989                         }
2990                 }
2991                 // Check for non-standard user language; this covers uselang,
2992                 // and extensions for auto-detecting user language.
2993                 $ulang = $wgLang->getCode();
2994                 $clang = $wgContLang->getCode();
2995
2996                 $cacheable = $wgUseFileCache
2997                         && (!$wgShowIPinHeader)
2998                         && ($this->getID() > 0)
2999                         && ($wgUser->isAnon())
3000                         && (!$wgUser->getNewtalk())
3001                         && (!$this->mRedirectedFrom)
3002                         && ($ulang === $clang);
3003                 // Extension may have reason to disable file caching on some pages.
3004                 if( $cacheable ) {
3005                         $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3006                 }
3007                 return $cacheable;
3008         }
3009
3010         /**
3011          * Loads page_touched and returns a value indicating if it should be used
3012          *
3013          */
3014         public function checkTouched() {
3015                 if( !$this->mDataLoaded ) {
3016                         $this->loadPageData();
3017                 }
3018                 return !$this->mIsRedirect;
3019         }
3020
3021         /**
3022          * Get the page_touched field
3023          */
3024         public function getTouched() {
3025                 # Ensure that page data has been loaded
3026                 if( !$this->mDataLoaded ) {
3027                         $this->loadPageData();
3028                 }
3029                 return $this->mTouched;
3030         }
3031
3032         /**
3033          * Get the page_latest field
3034          */
3035         public function getLatest() {
3036                 if( !$this->mDataLoaded ) {
3037                         $this->loadPageData();
3038                 }
3039                 return $this->mLatest;
3040         }
3041
3042         /**
3043          * Edit an article without doing all that other stuff
3044          * The article must already exist; link tables etc
3045          * are not updated, caches are not flushed.
3046          *
3047          * @param string $text text submitted
3048          * @param string $comment comment submitted
3049          * @param bool $minor whereas it's a minor modification
3050          */
3051         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3052                 wfProfileIn( __METHOD__ );
3053
3054                 $dbw = wfGetDB( DB_MASTER );
3055                 $revision = new Revision( array(
3056                         'page'       => $this->getId(),
3057                         'text'       => $text,
3058                         'comment'    => $comment,
3059                         'minor_edit' => $minor ? 1 : 0,
3060                         ) );
3061                 $revision->insertOn( $dbw );
3062                 $this->updateRevisionOn( $dbw, $revision );
3063
3064                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $wgUser) );
3065
3066                 wfProfileOut( __METHOD__ );
3067         }
3068
3069         /**
3070          * Used to increment the view counter
3071          *
3072          * @param integer $id article id
3073          */
3074         public static function incViewCount( $id ) {
3075                 $id = intval( $id );
3076                 global $wgHitcounterUpdateFreq, $wgDBtype;
3077
3078                 $dbw = wfGetDB( DB_MASTER );
3079                 $pageTable = $dbw->tableName( 'page' );
3080                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3081                 $acchitsTable = $dbw->tableName( 'acchits' );
3082
3083                 if( $wgHitcounterUpdateFreq <= 1 ) {
3084                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3085                         return;
3086                 }
3087
3088                 # Not important enough to warrant an error page in case of failure
3089                 $oldignore = $dbw->ignoreErrors( true );
3090
3091                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3092
3093                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
3094                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
3095                         # Most of the time (or on SQL errors), skip row count check
3096                         $dbw->ignoreErrors( $oldignore );
3097                         return;
3098                 }
3099
3100                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
3101                 $row = $dbw->fetchObject( $res );
3102                 $rown = intval( $row->n );
3103                 if( $rown >= $wgHitcounterUpdateFreq ){
3104                         wfProfileIn( 'Article::incViewCount-collect' );
3105                         $old_user_abort = ignore_user_abort( true );
3106
3107                         if($wgDBtype == 'mysql')
3108                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
3109                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
3110                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
3111                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
3112                                 'GROUP BY hc_id');
3113                         $dbw->query("DELETE FROM $hitcounterTable");
3114                         if($wgDBtype == 'mysql') {
3115                                 $dbw->query('UNLOCK TABLES');
3116                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3117                                         'WHERE page_id = hc_id');
3118                         }
3119                         else {
3120                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3121                                         "FROM $acchitsTable WHERE page_id = hc_id");
3122                         }
3123                         $dbw->query("DROP TABLE $acchitsTable");
3124
3125                         ignore_user_abort( $old_user_abort );
3126                         wfProfileOut( 'Article::incViewCount-collect' );
3127                 }
3128                 $dbw->ignoreErrors( $oldignore );
3129         }
3130
3131         /**#@+
3132          * The onArticle*() functions are supposed to be a kind of hooks
3133          * which should be called whenever any of the specified actions
3134          * are done.
3135          *
3136          * This is a good place to put code to clear caches, for instance.
3137          *
3138          * This is called on page move and undelete, as well as edit
3139          * @static
3140          * @param $title_obj a title object
3141          */
3142
3143         public static function onArticleCreate( $title ) {
3144                 # Update existence markers on article/talk tabs...
3145                 if( $title->isTalkPage() ) {
3146                         $other = $title->getSubjectPage();
3147                 } else {
3148                         $other = $title->getTalkPage();
3149                 }
3150                 $other->invalidateCache();
3151                 $other->purgeSquid();
3152
3153                 $title->touchLinks();
3154                 $title->purgeSquid();
3155                 $title->deleteTitleProtection();
3156         }
3157
3158         public static function onArticleDelete( $title ) {
3159                 global $wgUseFileCache, $wgMessageCache;
3160                 # Update existence markers on article/talk tabs...
3161                 if( $title->isTalkPage() ) {
3162                         $other = $title->getSubjectPage();
3163                 } else {
3164                         $other = $title->getTalkPage();
3165                 }
3166                 $other->invalidateCache();
3167                 $other->purgeSquid();
3168
3169                 $title->touchLinks();
3170                 $title->purgeSquid();
3171
3172                 # File cache
3173                 if( $wgUseFileCache ) {
3174                         $cm = new HTMLFileCache( $title );
3175                         @unlink( $cm->fileCacheName() );
3176                 }
3177
3178                 # Messages
3179                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
3180                         $wgMessageCache->replace( $title->getDBkey(), false );
3181                 }
3182                 # Images
3183                 if( $title->getNamespace() == NS_IMAGE ) {
3184                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3185                         $update->doUpdate();
3186                 }
3187                 # User talk pages
3188                 if( $title->getNamespace() == NS_USER_TALK ) {
3189                         $user = User::newFromName( $title->getText(), false );
3190                         $user->setNewtalk( false );
3191                 }
3192         }
3193
3194         /**
3195          * Purge caches on page update etc
3196          */
3197         public static function onArticleEdit( $title, $transclusions = 'transclusions' ) {
3198                 global $wgDeferredUpdateList, $wgUseFileCache;
3199
3200                 // Invalidate caches of articles which include this page
3201                 if( $transclusions !== 'skiptransclusions' )
3202                         $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3203
3204                 // Invalidate the caches of all pages which redirect here
3205                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3206
3207                 # Purge squid for this page only
3208                 $title->purgeSquid();
3209
3210                 # Clear file cache for this page only
3211                 if( $wgUseFileCache ) {
3212                         $cm = new HTMLFileCache( $title );
3213                         @unlink( $cm->fileCacheName() );
3214                 }
3215         }
3216
3217         /**#@-*/
3218
3219         /**
3220          * Overriden by ImagePage class, only present here to avoid a fatal error
3221          * Called for ?action=revert
3222          */
3223         public function revert() {
3224                 global $wgOut;
3225                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3226         }
3227
3228         /**
3229          * Info about this page
3230          * Called for ?action=info when $wgAllowPageInfo is on.
3231          *
3232          * @public
3233          */
3234         public function info() {
3235                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3236
3237                 if( !$wgAllowPageInfo ) {
3238                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3239                         return;
3240                 }
3241
3242                 $page = $this->mTitle->getSubjectPage();
3243
3244                 $wgOut->setPagetitle( $page->getPrefixedText() );
3245                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3246                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ) );
3247
3248                 if( !$this->mTitle->exists() ) {
3249                         $wgOut->addHTML( '<div class="noarticletext">' );
3250                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3251                                 // This doesn't quite make sense; the user is asking for
3252                                 // information about the _page_, not the message... -- RC
3253                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3254                         } else {
3255                                 $msg = $wgUser->isLoggedIn()
3256                                         ? 'noarticletext'
3257                                         : 'noarticletextanon';
3258                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3259                         }
3260                         $wgOut->addHTML( '</div>' );
3261                 } else {
3262                         $dbr = wfGetDB( DB_SLAVE );
3263                         $wl_clause = array(
3264                                 'wl_title'     => $page->getDBkey(),
3265                                 'wl_namespace' => $page->getNamespace() );
3266                         $numwatchers = $dbr->selectField(
3267                                 'watchlist',
3268                                 'COUNT(*)',
3269                                 $wl_clause,
3270                                 __METHOD__,
3271                                 $this->getSelectOptions() );
3272
3273                         $pageInfo = $this->pageCountInfo( $page );
3274                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3275
3276                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3277                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3278                         if( $talkInfo ) {
3279                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3280                         }
3281                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3282                         if( $talkInfo ) {
3283                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3284                         }
3285                         $wgOut->addHTML( '</ul>' );
3286                 }
3287         }
3288
3289         /**
3290          * Return the total number of edits and number of unique editors
3291          * on a given page. If page does not exist, returns false.
3292          *
3293          * @param Title $title
3294          * @return array
3295          */
3296         protected function pageCountInfo( $title ) {
3297                 $id = $title->getArticleId();
3298                 if( $id == 0 ) {
3299                         return false;
3300                 }
3301                 $dbr = wfGetDB( DB_SLAVE );
3302                 $rev_clause = array( 'rev_page' => $id );
3303                 $edits = $dbr->selectField(
3304                         'revision',
3305                         'COUNT(rev_page)',
3306                         $rev_clause,
3307                         __METHOD__,
3308                         $this->getSelectOptions()
3309                 );
3310                 $authors = $dbr->selectField(
3311                         'revision',
3312                         'COUNT(DISTINCT rev_user_text)',
3313                         $rev_clause,
3314                         __METHOD__,
3315                         $this->getSelectOptions()
3316                 );
3317                 return array( 'edits' => $edits, 'authors' => $authors );
3318         }
3319
3320         /**
3321          * Return a list of templates used by this article.
3322          * Uses the templatelinks table
3323          *
3324          * @return array Array of Title objects
3325          */
3326         public function getUsedTemplates() {
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( 'templatelinks' ),
3334                         array( 'tl_namespace', 'tl_title' ),
3335                         array( 'tl_from' => $id ),
3336                         __METHOD__ );
3337                 if( $res !== false ) {
3338                         foreach( $res as $row ) {
3339                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3340                         }
3341                 }
3342                 $dbr->freeResult( $res );
3343                 return $result;
3344         }
3345
3346         /**
3347          * Returns a list of hidden categories this page is a member of.
3348          * Uses the page_props and categorylinks tables.
3349          *
3350          * @return array Array of Title objects
3351          */
3352         public function getHiddenCategories() {
3353                 $result = array();
3354                 $id = $this->mTitle->getArticleID();
3355                 if( $id == 0 ) {
3356                         return array();
3357                 }
3358                 $dbr = wfGetDB( DB_SLAVE );
3359                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3360                         array( 'cl_to' ),
3361                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3362                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3363                         __METHOD__ );
3364                 if( $res !== false ) {
3365                         foreach( $res as $row ) {
3366                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3367                         }
3368                 }
3369                 $dbr->freeResult( $res );
3370                 return $result;
3371         }
3372
3373         /**
3374         * Return an applicable autosummary if one exists for the given edit.
3375         * @param string $oldtext The previous text of the page.
3376         * @param string $newtext The submitted text of the page.
3377         * @param bitmask $flags A bitmask of flags submitted for the edit.
3378         * @return string An appropriate autosummary, or an empty string.
3379         */
3380         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3381                 # Decide what kind of autosummary is needed.
3382
3383                 # Redirect autosummaries
3384                 $ot = Title::newFromRedirect( $oldtext );
3385                 $rt = Title::newFromRedirect( $newtext );
3386                 if( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
3387                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3388                 }
3389
3390                 # New page autosummaries
3391                 if( $flags & EDIT_NEW && strlen( $newtext ) ) {
3392                         # If they're making a new article, give its text, truncated, in the summary.
3393                         global $wgContLang;
3394                         $truncatedtext = $wgContLang->truncate(
3395                                 str_replace("\n", ' ', $newtext),
3396                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ),
3397                                 '...' );
3398                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3399                 }
3400
3401                 # Blanking autosummaries
3402                 if( $oldtext != '' && $newtext == '' ) {
3403                         return wfMsgForContent( 'autosumm-blank' );
3404                 } elseif( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500) {
3405                         # Removing more than 90% of the article
3406                         global $wgContLang;
3407                         $truncatedtext = $wgContLang->truncate(
3408                                 $newtext,
3409                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ),
3410                                 '...'
3411                         );
3412                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3413                 }
3414
3415                 # If we reach this point, there's no applicable autosummary for our case, so our
3416                 # autosummary is empty.
3417                 return '';
3418         }
3419
3420         /**
3421          * Add the primary page-view wikitext to the output buffer
3422          * Saves the text into the parser cache if possible.
3423          * Updates templatelinks if it is out of date.
3424          *
3425          * @param string  $text
3426          * @param bool    $cache
3427          */
3428         public function outputWikiText( $text, $cache = true ) {
3429                 global $wgParser, $wgUser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
3430
3431                 $popts = $wgOut->parserOptions();
3432                 $popts->setTidy(true);
3433                 $popts->enableLimitReport();
3434                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3435                         $popts, true, true, $this->getRevIdFetched() );
3436                 $popts->setTidy(false);
3437                 $popts->enableLimitReport( false );
3438                 if( $wgEnableParserCache && $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3439                         $parserCache = ParserCache::singleton();
3440                         $parserCache->save( $parserOutput, $this, $wgUser );
3441                 }
3442                 // Make sure file cache is not used on uncacheable content.
3443                 // Output that has magic words in it can still use the parser cache
3444                 // (if enabled), though it will generally expire sooner.
3445                 if( $parserOutput->getCacheTime() == -1 || $parserOutput->containsOldMagic() ) {
3446                         $wgUseFileCache = false;
3447                 }
3448
3449                 if( $this->isCurrent() && !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3450                         // templatelinks table may have become out of sync,
3451                         // especially if using variable-based transclusions.
3452                         // For paranoia, check if things have changed and if
3453                         // so apply updates to the database. This will ensure
3454                         // that cascaded protections apply as soon as the changes
3455                         // are visible.
3456
3457                         # Get templates from templatelinks
3458                         $id = $this->mTitle->getArticleID();
3459
3460                         $tlTemplates = array();
3461
3462                         $dbr = wfGetDB( DB_SLAVE );
3463                         $res = $dbr->select( array( 'templatelinks' ),
3464                                 array( 'tl_namespace', 'tl_title' ),
3465                                 array( 'tl_from' => $id ),
3466                                 __METHOD__ );
3467
3468                         global $wgContLang;
3469
3470                         if( $res !== false ) {
3471                                 foreach( $res as $row ) {
3472                                         $tlTemplates[] = $wgContLang->getNsText( $row->tl_namespace ) . ':' . $row->tl_title ;
3473                                 }
3474                         }
3475
3476                         # Get templates from parser output.
3477                         $poTemplates_allns = $parserOutput->getTemplates();
3478
3479                         $poTemplates = array ();
3480                         foreach ( $poTemplates_allns as $ns_templates ) {
3481                                 $poTemplates = array_merge( $poTemplates, $ns_templates );
3482                         }
3483
3484                         # Get the diff
3485                         $templates_diff = array_diff( $poTemplates, $tlTemplates );
3486
3487                         if( count( $templates_diff ) > 0 ) {
3488                                 # Whee, link updates time.
3489                                 $u = new LinksUpdate( $this->mTitle, $parserOutput );
3490                                 $u->doUpdate();
3491                         }
3492                 }
3493
3494                 $wgOut->addParserOutput( $parserOutput );
3495         }
3496
3497         /**
3498          * Update all the appropriate counts in the category table, given that
3499          * we've added the categories $added and deleted the categories $deleted.
3500          *
3501          * @param $added array   The names of categories that were added
3502          * @param $deleted array The names of categories that were deleted
3503          * @return null
3504          */
3505         public function updateCategoryCounts( $added, $deleted ) {
3506                 $ns = $this->mTitle->getNamespace();
3507                 $dbw = wfGetDB( DB_MASTER );
3508
3509                 # First make sure the rows exist.  If one of the "deleted" ones didn't
3510                 # exist, we might legitimately not create it, but it's simpler to just
3511                 # create it and then give it a negative value, since the value is bogus
3512                 # anyway.
3513                 #
3514                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3515                 $insertCats = array_merge( $added, $deleted );
3516                 if( !$insertCats ) {
3517                         # Okay, nothing to do
3518                         return;
3519                 }
3520                 $insertRows = array();
3521                 foreach( $insertCats as $cat ) {
3522                         $insertRows[] = array( 'cat_title' => $cat );
3523                 }
3524                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3525
3526                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3527                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3528                 if( $ns == NS_CATEGORY ) {
3529                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3530                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3531                 } elseif( $ns == NS_IMAGE ) {
3532                         $addFields[]    = 'cat_files = cat_files + 1';
3533                         $removeFields[] = 'cat_files = cat_files - 1';
3534                 }
3535
3536                 if( $added ) {
3537                         $dbw->update(
3538                                 'category',
3539                                 $addFields,
3540                                 array( 'cat_title' => $added ),
3541                                 __METHOD__
3542                         );
3543                 }
3544                 if( $deleted ) {
3545                         $dbw->update(
3546                                 'category',
3547                                 $removeFields,
3548                                 array( 'cat_title' => $deleted ),
3549                                 __METHOD__
3550                         );
3551                 }
3552         }
3553 }