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         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
  62                 return $t == null ? null : new Article( $t );
  63         }
  64
  65         /**
  66          * Tell the page view functions that this view was redirected
  67          * from another page on the wiki.
  68          * @param $from Title object.
  69          */
  70         function setRedirectedFrom( $from ) {
  71                 $this->mRedirectedFrom = $from;
  72         }
  73
  74         /**
  75          * If this page is a redirect, get its target
  76          *
  77          * The target will be fetched from the redirect table if possible.
  78          * If this page doesn't have an entry there, call insertRedirect()
  79          * @return mixed Title object, or null if this page is not a redirect
  80          */
  81         public function getRedirectTarget() {
  82                 if(!$this->mTitle || !$this->mTitle->isRedirect())
  83                         return null;
  84                 if(!is_null($this->mRedirectTarget))
  85                         return $this->mRedirectTarget;
  86
  87                 # Query the redirect table
  88                 $dbr = wfGetDB(DB_SLAVE);
  89                 $res = $dbr->select('redirect',
  90                                 array('rd_namespace', 'rd_title'),
  91                                 array('rd_from' => $this->getID()),
  92                                 __METHOD__
  93                 );
  94                 $row = $dbr->fetchObject($res);
  95                 if($row)
  96                         return $this->mRedirectTarget = Title::makeTitle($row->rd_namespace, $row->rd_title);
  97
  98                 # This page doesn't have an entry in the redirect table
  99                 return $this->mRedirectTarget = $this->insertRedirect();
 100         }
 101
 102         /**
 103          * Insert an entry for this page into the redirect table.
 104          *
 105          * Don't call this function directly unless you know what you're doing.
 106          * @return Title object
 107          */
 108         public function insertRedirect() {
 109                 $retval = Title::newFromRedirect($this->getContent());
 110                 if(!$retval)
 111                         return null;
 112                 $dbw = wfGetDB(DB_MASTER);
 113                 $dbw->replace('redirect', array('rd_from'), array(
 114                                 'rd_from' => $this->getID(),
 115                                 'rd_namespace' => $retval->getNamespace(),
 116                                 'rd_title' => $retval->getDBKey()
 117                 ), __METHOD__);
 118                 return $retval;
 119         }
 120
 121         /**
 122          * Get the Title object this page redirects to
 123          *
 124          * @return mixed false, Title of in-wiki target, or string with URL
 125          */
 126         public function followRedirect() {
 127                 $text = $this->getContent();
 128                 return $this->followRedirectText( $text );
 129         }
 130
 131         /**
 132          * Get the Title object this text redirects to
 133          *
 134          * @return mixed false, Title of in-wiki target, or string with URL
 135          */
 136         public function followRedirectText( $text ) {
 137                 $rt = Title::newFromRedirect( $text );
 138                 # process if title object is valid and not special:userlogout
 139                 if( $rt ) {
 140                         if( $rt->getInterwiki() != '' ) {
 141                                 if( $rt->isLocal() ) {
 142                                         // Offsite wikis need an HTTP redirect.
 143                                         //
 144                                         // This can be hard to reverse and may produce loops,
 145                                         // so they may be disabled in the site configuration.
 146
 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
 158                                         if( $rt->isSpecial( 'Userlogout' ) ) {
 159                                                 // rolleyes
 160                                         } else {
 161                                                 return $rt->getFullURL();
 162                                         }
 163                                 }
 164                                 return $rt;
 165                         }
 166                 }
 167                 // No or invalid redirect
 168                 return false;
 169         }
 170
 171         /**
 172          * get the title object of the article
 173          */
 174         function getTitle() {
 175                 return $this->mTitle;
 176         }
 177
 178         /**
 179           * Clear the object
 180           * @private
 181           */
 182         function clear() {
 183                 $this->mDataLoaded    = false;
 184                 $this->mContentLoaded = false;
 185
 186                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 187                 $this->mRedirectedFrom = null; # Title object if set
 188                 $this->mRedirectTarget = null; # Title object if set
 189                 $this->mUserText =
 190                 $this->mTimestamp = $this->mComment = '';
 191                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 192                 $this->mTouched = '19700101000000';
 193                 $this->mForUpdate = false;
 194                 $this->mIsRedirect = false;
 195                 $this->mRevIdFetched = 0;
 196                 $this->mRedirectUrl = false;
 197                 $this->mLatest = false;
 198                 $this->mPreparedEdit = false;
 199         }
 200
 201         /**
 202          * Note that getContent/loadContent do not follow redirects anymore.
 203          * If you need to fetch redirectable content easily, try
 204          * the shortcut in Article::followContent()
 205          * FIXME
 206          * @todo There are still side-effects in this!
 207          *        In general, you should use the Revision class, not Article,
 208          *        to fetch text for purposes other than page views.
 209          *
 210          * @return Return the text of this revision
 211         */
 212         function getContent() {
 213                 global $wgUser, $wgOut, $wgMessageCache;
 214
 215                 wfProfileIn( __METHOD__ );
 216
 217                 if ( 0 == $this->getID() ) {
 218                         wfProfileOut( __METHOD__ );
 219                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
 220
 221                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 222                                 $wgMessageCache->loadAllMessages();
 223                                 $ret = wfMsgWeirdKey ( $this->mTitle->getText() ) ;
 224                         } else {
 225                                 $ret = wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' );
 226                         }
 227
 228                         return "<div class='noarticletext'>\n$ret\n</div>";
 229                 } else {
 230                         $this->loadContent();
 231                         wfProfileOut( __METHOD__ );
 232                         return $this->mContent;
 233                 }
 234         }
 235
 236         /**
 237          * This function returns the text of a section, specified by a number ($section).
 238          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 239          * the first section before any such heading (section 0).
 240          *
 241          * If a section contains subsections, these are also returned.
 242          *
 243          * @param $text String: text to look in
 244          * @param $section Integer: section number
 245          * @return string text of the requested section
 246          * @deprecated
 247          */
 248         function getSection($text,$section) {
 249                 global $wgParser;
 250                 return $wgParser->getSection( $text, $section );
 251         }
 252
 253         /**
 254          * @return int The oldid of the article that is to be shown, 0 for the
 255          *             current revision
 256          */
 257         function getOldID() {
 258                 if ( is_null( $this->mOldId ) ) {
 259                         $this->mOldId = $this->getOldIDFromRequest();
 260                 }
 261                 return $this->mOldId;
 262         }
 263
 264         /**
 265          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 266          *
 267          * @return int The old id for the request
 268          */
 269         public function getOldIDFromRequest() {
 270                 global $wgRequest;
 271                 $this->mRedirectUrl = false;
 272                 $oldid = $wgRequest->getVal( 'oldid' );
 273                 if ( isset( $oldid ) ) {
 274                         $oldid = intval( $oldid );
 275                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 276                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 277                                 if ( $nextid  ) {
 278                                         $oldid = $nextid;
 279                                 } else {
 280                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 281                                 }
 282                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 283                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 284                                 if ( $previd ) {
 285                                         $oldid = $previd;
 286                                 } else {
 287                                         # TODO
 288                                 }
 289                         }
 290                         # unused:
 291                         # $lastid = $oldid;
 292                 }
 293
 294                 if ( !$oldid ) {
 295                         $oldid = 0;
 296                 }
 297                 return $oldid;
 298         }
 299
 300         /**
 301          * Load the revision (including text) into this object
 302          */
 303         function loadContent() {
 304                 if ( $this->mContentLoaded ) return;
 305
 306                 # Query variables :P
 307                 $oldid = $this->getOldID();
 308
 309                 # Pre-fill content with error message so that if something
 310                 # fails we'll have something telling us what we intended.
 311                 $this->mOldId = $oldid;
 312                 $this->fetchContent( $oldid );
 313         }
 314
 315
 316         /**
 317          * Fetch a page record with the given conditions
 318          * @param Database $dbr
 319          * @param array    $conditions
 320          * @private
 321          */
 322         function pageData( $dbr, $conditions ) {
 323                 $fields = array(
 324                                 'page_id',
 325                                 'page_namespace',
 326                                 'page_title',
 327                                 'page_restrictions',
 328                                 'page_counter',
 329                                 'page_is_redirect',
 330                                 'page_is_new',
 331                                 'page_random',
 332                                 'page_touched',
 333                                 'page_latest',
 334                                 'page_len',
 335                 );
 336                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 337                 $row = $dbr->selectRow(
 338                         'page',
 339                         $fields,
 340                         $conditions,
 341                         __METHOD__
 342                 );
 343                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 344                 return $row ;
 345         }
 346
 347         /**
 348          * @param Database $dbr
 349          * @param Title $title
 350          */
 351         function pageDataFromTitle( $dbr, $title ) {
 352                 return $this->pageData( $dbr, array(
 353                         'page_namespace' => $title->getNamespace(),
 354                         'page_title'     => $title->getDBkey() ) );
 355         }
 356
 357         /**
 358          * @param Database $dbr
 359          * @param int $id
 360          */
 361         function pageDataFromId( $dbr, $id ) {
 362                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 363         }
 364
 365         /**
 366          * Set the general counter, title etc data loaded from
 367          * some source.
 368          *
 369          * @param object $data
 370          * @private
 371          */
 372         function loadPageData( $data = 'fromdb' ) {
 373                 if ( $data === 'fromdb' ) {
 374                         $dbr = wfGetDB( DB_MASTER );
 375                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 376                 }
 377
 378                 $lc = LinkCache::singleton();
 379                 if ( $data ) {
 380                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 381
 382                         $this->mTitle->mArticleID = $data->page_id;
 383
 384                         # Old-fashioned restrictions.
 385                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 386
 387                         $this->mCounter     = $data->page_counter;
 388                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 389                         $this->mIsRedirect  = $data->page_is_redirect;
 390                         $this->mLatest      = $data->page_latest;
 391                 } else {
 392                         if ( is_object( $this->mTitle ) ) {
 393                                 $lc->addBadLinkObj( $this->mTitle );
 394                         }
 395                         $this->mTitle->mArticleID = 0;
 396                 }
 397
 398                 $this->mDataLoaded  = true;
 399         }
 400
 401         /**
 402          * Get text of an article from database
 403          * Does *NOT* follow redirects.
 404          * @param int $oldid 0 for whatever the latest revision is
 405          * @return string
 406          */
 407         function fetchContent( $oldid = 0 ) {
 408                 if ( $this->mContentLoaded ) {
 409                         return $this->mContent;
 410                 }
 411
 412                 $dbr = wfGetDB( DB_MASTER );
 413
 414                 # Pre-fill content with error message so that if something
 415                 # fails we'll have something telling us what we intended.
 416                 $t = $this->mTitle->getPrefixedText();
 417                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 418                 $this->mContent = wfMsg( 'missing-article', $t, $d ) ;
 419
 420                 if( $oldid ) {
 421                         $revision = Revision::newFromId( $oldid );
 422                         if( is_null( $revision ) ) {
 423                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 424                                 return false;
 425                         }
 426                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 427                         if( !$data ) {
 428                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 429                                 return false;
 430                         }
 431                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 432                         $this->loadPageData( $data );
 433                 } else {
 434                         if( !$this->mDataLoaded ) {
 435                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 436                                 if( !$data ) {
 437                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 438                                         return false;
 439                                 }
 440                                 $this->loadPageData( $data );
 441                         }
 442                         $revision = Revision::newFromId( $this->mLatest );
 443                         if( is_null( $revision ) ) {
 444                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$this->mLatest}\n" );
 445                                 return false;
 446                         }
 447                 }
 448
 449                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 450                 // We should instead work with the Revision object when we need it...
 451                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 452
 453                 $this->mUser      = $revision->getUser();
 454                 $this->mUserText  = $revision->getUserText();
 455                 $this->mComment   = $revision->getComment();
 456                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 457
 458                 $this->mRevIdFetched = $revision->getId();
 459                 $this->mContentLoaded = true;
 460                 $this->mRevision =& $revision;
 461
 462                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 463
 464                 return $this->mContent;
 465         }
 466
 467         /**
 468          * Read/write accessor to select FOR UPDATE
 469          *
 470          * @param $x Mixed: FIXME
 471          */
 472         function forUpdate( $x = NULL ) {
 473                 return wfSetVar( $this->mForUpdate, $x );
 474         }
 475
 476         /**
 477          * Get the database which should be used for reads
 478          *
 479          * @return Database
 480          * @deprecated - just call wfGetDB( DB_MASTER ) instead
 481          */
 482         function getDB() {
 483                 wfDeprecated( __METHOD__ );
 484                 return wfGetDB( DB_MASTER );
 485         }
 486
 487         /**
 488          * Get options for all SELECT statements
 489          *
 490          * @param $options Array: an optional options array which'll be appended to
 491          *                       the default
 492          * @return Array: options
 493          */
 494         function getSelectOptions( $options = '' ) {
 495                 if ( $this->mForUpdate ) {
 496                         if ( is_array( $options ) ) {
 497                                 $options[] = 'FOR UPDATE';
 498                         } else {
 499                                 $options = 'FOR UPDATE';
 500                         }
 501                 }
 502                 return $options;
 503         }
 504
 505         /**
 506          * @return int Page ID
 507          */
 508         function getID() {
 509                 if( $this->mTitle ) {
 510                         return $this->mTitle->getArticleID();
 511                 } else {
 512                         return 0;
 513                 }
 514         }
 515
 516         /**
 517          * @return bool Whether or not the page exists in the database
 518          */
 519         function exists() {
 520                 return $this->getId() != 0;
 521         }
 522
 523         /**
 524          * @return int The view count for the page
 525          */
 526         function getCount() {
 527                 if ( -1 == $this->mCounter ) {
 528                         $id = $this->getID();
 529                         if ( $id == 0 ) {
 530                                 $this->mCounter = 0;
 531                         } else {
 532                                 $dbr = wfGetDB( DB_SLAVE );
 533                                 $this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
 534                                         'Article::getCount', $this->getSelectOptions() );
 535                         }
 536                 }
 537                 return $this->mCounter;
 538         }
 539
 540         /**
 541          * Determine whether a page  would be suitable for being counted as an
 542          * article in the site_stats table based on the title & its content
 543          *
 544          * @param $text String: text to analyze
 545          * @return bool
 546          */
 547         function isCountable( $text ) {
 548                 global $wgUseCommaCount;
 549
 550                 $token = $wgUseCommaCount ? ',' : '[[';
 551                 return
 552                         $this->mTitle->isContentPage()
 553                         && !$this->isRedirect( $text )
 554                         && in_string( $token, $text );
 555         }
 556
 557         /**
 558          * Tests if the article text represents a redirect
 559          *
 560          * @param $text String: FIXME
 561          * @return bool
 562          */
 563         function isRedirect( $text = false ) {
 564                 if ( $text === false ) {
 565                         if ( $this->mDataLoaded )
 566                                 return $this->mIsRedirect;
 567
 568                         // Apparently loadPageData was never called
 569                         $this->loadContent();
 570                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 571                 } else {
 572                         $titleObj = Title::newFromRedirect( $text );
 573                 }
 574                 return $titleObj !== NULL;
 575         }
 576
 577         /**
 578          * Returns true if the currently-referenced revision is the current edit
 579          * to this page (and it exists).
 580          * @return bool
 581          */
 582         function isCurrent() {
 583                 # If no oldid, this is the current version.
 584                 if ($this->getOldID() == 0)
 585                         return true;
 586
 587                 return $this->exists() &&
 588                         isset( $this->mRevision ) &&
 589                         $this->mRevision->isCurrent();
 590         }
 591
 592         /**
 593          * Loads everything except the text
 594          * This isn't necessary for all uses, so it's only done if needed.
 595          * @private
 596          */
 597         function loadLastEdit() {
 598                 if ( -1 != $this->mUser )
 599                         return;
 600
 601                 # New or non-existent articles have no user information
 602                 $id = $this->getID();
 603                 if ( 0 == $id ) return;
 604
 605                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 606                 if( !is_null( $this->mLastRevision ) ) {
 607                         $this->mUser      = $this->mLastRevision->getUser();
 608                         $this->mUserText  = $this->mLastRevision->getUserText();
 609                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 610                         $this->mComment   = $this->mLastRevision->getComment();
 611                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 612                         $this->mRevIdFetched = $this->mLastRevision->getId();
 613                 }
 614         }
 615
 616         function getTimestamp() {
 617                 // Check if the field has been filled by ParserCache::get()
 618                 if ( !$this->mTimestamp ) {
 619                         $this->loadLastEdit();
 620                 }
 621                 return wfTimestamp(TS_MW, $this->mTimestamp);
 622         }
 623
 624         function getUser() {
 625                 $this->loadLastEdit();
 626                 return $this->mUser;
 627         }
 628
 629         function getUserText() {
 630                 $this->loadLastEdit();
 631                 return $this->mUserText;
 632         }
 633
 634         function getComment() {
 635                 $this->loadLastEdit();
 636                 return $this->mComment;
 637         }
 638
 639         function getMinorEdit() {
 640                 $this->loadLastEdit();
 641                 return $this->mMinorEdit;
 642         }
 643
 644         function getRevIdFetched() {
 645                 $this->loadLastEdit();
 646                 return $this->mRevIdFetched;
 647         }
 648
 649         /**
 650          * @param $limit Integer: default 0.
 651          * @param $offset Integer: default 0.
 652          */
 653         function getContributors($limit = 0, $offset = 0) {
 654                 # XXX: this is expensive; cache this info somewhere.
 655
 656                 $contribs = array();
 657                 $dbr = wfGetDB( DB_SLAVE );
 658                 $revTable = $dbr->tableName( 'revision' );
 659                 $userTable = $dbr->tableName( 'user' );
 660                 $user = $this->getUser();
 661                 $pageId = $this->getId();
 662
 663                 $sql = "SELECT {$userTable}.*, MAX(rev_timestamp) as timestamp
 664                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 665                         WHERE rev_page = $pageId
 666                         AND rev_user != $user
 667                         GROUP BY rev_user, rev_user_text, user_real_name
 668                         ORDER BY timestamp DESC";
 669
 670                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 671                 if ($offset > 0) { $sql .= ' OFFSET '.$offset; }
 672
 673                 $sql .= ' '. $this->getSelectOptions();
 674
 675                 $res = $dbr->query($sql, __METHOD__ );
 676
 677                 return new UserArrayFromResult( $res );
 678         }
 679
 680         /**
 681          * This is the default action of the script: just view the page of
 682          * the given title.
 683         */
 684         function view() {
 685                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 686                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 687                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 688                 global $wgDefaultRobotPolicy;
 689                 $sk = $wgUser->getSkin();
 690
 691                 wfProfileIn( __METHOD__ );
 692
 693                 $parserCache = ParserCache::singleton();
 694                 $ns = $this->mTitle->getNamespace(); # shortcut
 695
 696                 # Get variables from query string
 697                 $oldid = $this->getOldID();
 698
 699                 # getOldID may want us to redirect somewhere else
 700                 if ( $this->mRedirectUrl ) {
 701                         $wgOut->redirect( $this->mRedirectUrl );
 702                         wfProfileOut( __METHOD__ );
 703                         return;
 704                 }
 705
 706                 $diff = $wgRequest->getVal( 'diff' );
 707                 $rcid = $wgRequest->getVal( 'rcid' );
 708                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 709                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 710                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 711
 712                 $wgOut->setArticleFlag( true );
 713
 714                 # Discourage indexing of printable versions, but encourage following
 715                 if( $wgOut->isPrintable() ) {
 716                         $policy = 'noindex,follow';
 717                 } elseif ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 718                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 719                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 720                         # Honour customised robot policies for this namespace
 721                         $policy = $wgNamespaceRobotPolicies[$ns];
 722                 } else {
 723                         $policy = $wgDefaultRobotPolicy;
 724                 }
 725                 $wgOut->setRobotPolicy( $policy );
 726
 727                 # If we got diff and oldid in the query, we want to see a
 728                 # diff page instead of the article.
 729
 730                 if ( !is_null( $diff ) ) {
 731                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 732
 733                         $diff = $wgRequest->getVal( 'diff' );
 734                         $htmldiff = $wgRequest->getVal( 'htmldiff' , false);
 735                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $htmldiff);
 736                         // DifferenceEngine directly fetched the revision:
 737                         $this->mRevIdFetched = $de->mNewid;
 738                         $de->showDiffPage( $diffOnly );
 739
 740                         // Needed to get the page's current revision
 741                         $this->loadPageData();
 742                         if( $diff == 0 || $diff == $this->mLatest ) {
 743                                 # Run view updates for current revision only
 744                                 $this->viewUpdates();
 745                         }
 746                         wfProfileOut( __METHOD__ );
 747                         return;
 748                 }
 749
 750                 if ( empty( $oldid ) && $this->checkTouched() ) {
 751                         $wgOut->setETag($parserCache->getETag($this, $wgUser));
 752
 753                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 754                                 wfProfileOut( __METHOD__ );
 755                                 return;
 756                         } else if ( $this->tryFileCache() ) {
 757                                 # tell wgOut that output is taken care of
 758                                 $wgOut->disable();
 759                                 $this->viewUpdates();
 760                                 wfProfileOut( __METHOD__ );
 761                                 return;
 762                         }
 763                 }
 764
 765                 # Should the parser cache be used?
 766                 $pcache = $this->useParserCache( $oldid );
 767                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 768                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 769                         wfIncrStats( 'pcache_miss_stub' );
 770                 }
 771
 772                 $wasRedirected = false;
 773                 if ( isset( $this->mRedirectedFrom ) ) {
 774                         // This is an internally redirected page view.
 775                         // We'll need a backlink to the source page for navigation.
 776                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 777                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 778                                 $s = wfMsg( 'redirectedfrom', $redir );
 779                                 $wgOut->setSubtitle( $s );
 780
 781                                 // Set the fragment if one was specified in the redirect
 782                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
 783                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 784                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 785                                 }
 786                                 $wasRedirected = true;
 787                         }
 788                 } elseif ( !empty( $rdfrom ) ) {
 789                         // This is an externally redirected view, from some other wiki.
 790                         // If it was reported from a trusted site, supply a backlink.
 791                         global $wgRedirectSources;
 792                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 793                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 794                                 $s = wfMsg( 'redirectedfrom', $redir );
 795                                 $wgOut->setSubtitle( $s );
 796                                 $wasRedirected = true;
 797                         }
 798                 }
 799
 800                 # Optional notices on a per-namespace and per-page basis
 801                 $mw = MagicWord::get( 'noheader' );
 802                 $ignoreheader = false;
 803                 $text = $this->getContent();
 804                 if( $mw->match( $text ) ) {
 805                         $ignoreheader = true;
 806                 }
 807                 $pageheader_ns   = 'pageheader-'.$this->mTitle->getNamespace();
 808                 $pageheader_page = $pageheader_ns.'-'.$this->mTitle->getDBkey();
 809                 if ( !wfEmptyMsg( $pageheader_ns, wfMsgForContent( $pageheader_ns ) ) && !$ignoreheader ) {
 810                         $wgOut->addWikiText( wfMsgForContent( $pageheader_ns )  );
 811                 }
 812
 813                 if ( MWNamespace::hasSubpages( $this->mTitle->getNamespace() ) && !$ignoreheader  ) {
 814                         $parts = explode( '/', $this->mTitle->getDBkey() );
 815                         $pageheader_base = $pageheader_ns;
 816                         while ( count( $parts ) > 0 ) {
 817                                 $pageheader_base .= '-'.array_shift( $parts );
 818                                 if ( !wfEmptyMsg( $pageheader_base, wfMsgForContent( $pageheader_base ) ) ) {
 819                                         $wgOut->addWikiText( wfMsgForContent( $pageheader_base )  );
 820                                 }
 821                         }
 822                 } else if ( !wfEmptyMsg( $pageheader_page, wfMsgForContent( $pageheader_page ) ) && !$ignoreheader  ) {
 823                         $wgOut->addWikiText( wfMsgForContent( $pageheader_page ) );
 824                 }
 825
 826                 $outputDone = false;
 827                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 828                 if ( $pcache ) {
 829                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 830                                 // Ensure that UI elements requiring revision ID have
 831                                 // the correct version information.
 832                                 $wgOut->setRevisionId( $this->mLatest );
 833                                 $outputDone = true;
 834                         }
 835                 }
 836                 # Fetch content and check for errors
 837                 if ( !$outputDone ) {
 838                         # If the article does not exist and was deleted, show the log
 839                         if ($this->getID() == 0) {
 840                                 $loglist = new LogEventsList( $wgUser->getSkin(), $wgOut );
 841                                 $pager = new LogPager( $loglist, 'delete', false, $this->mTitle->getPrefixedText() );
 842                                 $count = $pager->getNumRows();
 843                                 if( $count > 0 ) {
 844                                         $pager->mLimit = 10;
 845                                         $wgOut->addHtml( '<div id="mw-deleted-notice">' );
 846                                         $wgOut->addWikiMsg( 'deleted-notice' );
 847                                         $wgOut->addHTML(
 848                                                 $loglist->beginLogEventsList() .
 849                                                 $pager->getBody() .
 850                                                 $loglist->endLogEventsList()
 851                                         );
 852                                         if($count > 10){
 853                                                 $wgOut->addHtml( $wgUser->getSkin()->link(
 854                                                         SpecialPage::getTitleFor( 'Log' ),
 855                                                         wfMsgHtml( 'deletelog-fulllog' ),
 856                                                         array(),
 857                                                         array(
 858                                                                 'type' => 'delete',
 859                                                                 'page' => $this->mTitle->getPrefixedText() ) ) );
 860                                         }
 861                                         $wgOut->addHtml( '</div>' );
 862                                 }
 863                         }
 864                         if ( $text === false ) {
 865                                 # Failed to load, replace text with error message
 866                                 $t = $this->mTitle->getPrefixedText();
 867                                 if( $oldid ) {
 868                                         $d = wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid );
 869                                         $text = wfMsg( 'missing-article', $t, $d );
 870                                 } else {
 871                                         $text = wfMsg( 'noarticletext' );
 872                                 }
 873                         }
 874
 875                         # Another whitelist check in case oldid is altering the title
 876                         if ( !$this->mTitle->userCanRead() ) {
 877                                 $wgOut->loginToUse();
 878                                 $wgOut->output();
 879                                 wfProfileOut( __METHOD__ );
 880                                 exit;
 881                         }
 882
 883                         # We're looking at an old revision
 884                         if ( !empty( $oldid ) ) {
 885                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 886                                 if( is_null( $this->mRevision ) ) {
 887                                         // FIXME: This would be a nice place to load the 'no such page' text.
 888                                 } else {
 889                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 890                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 891                                                 if( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 892                                                         $wgOut->addWikiMsg( 'rev-deleted-text-permission' );
 893                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 894                                                         wfProfileOut( __METHOD__ );
 895                                                         return;
 896                                                 } else {
 897                                                         $wgOut->addWikiMsg( 'rev-deleted-text-view' );
 898                                                         // and we are allowed to see...
 899                                                 }
 900                                         }
 901                                 }
 902                         }
 903
 904                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 905
 906                          // Pages containing custom CSS or JavaScript get special treatment
 907                         if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 908                                 $wgOut->addHtml( wfMsgExt( 'clearyourcache', 'parse' ) );
 909                                 // Give hooks a chance to customise the output
 910                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 911                                         // Wrap the whole lot in a <pre> and don't parse
 912                                         $m = array();
 913                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 914                                         $wgOut->addHtml( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 915                                         $wgOut->addHtml( htmlspecialchars( $this->mContent ) );
 916                                         $wgOut->addHtml( "\n</pre>\n" );
 917                                 }
 918                         } else if ( $rt = Title::newFromRedirect( $text ) ) {
 919                                 # Don't append the subtitle if this was an old revision
 920                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 921                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 922                                 $wgOut->addParserOutputNoText( $parseout );
 923                         } else if ( $pcache ) {
 924                                 # Display content and save to parser cache
 925                                 $this->outputWikiText( $text );
 926                         } else {
 927                                 # Display content, don't attempt to save to parser cache
 928                                 # Don't show section-edit links on old revisions... this way lies madness.
 929                                 if( !$this->isCurrent() ) {
 930                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 931                                 }
 932                                 # Display content and don't save to parser cache
 933                                 # With timing hack -- TS 2006-07-26
 934                                 $time = -wfTime();
 935                                 $this->outputWikiText( $text, false );
 936                                 $time += wfTime();
 937
 938                                 # Timing hack
 939                                 if ( $time > 3 ) {
 940                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 941                                                 $this->mTitle->getPrefixedDBkey()));
 942                                 }
 943
 944                                 if( !$this->isCurrent() ) {
 945                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 946                                 }
 947                         }
 948                 }
 949                 /* title may have been set from the cache */
 950                 $t = $wgOut->getPageTitle();
 951                 if( empty( $t ) ) {
 952                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 953
 954                         # For the main page, overwrite the <title> element with the con-
 955                         # tents of 'pagetitle-view-mainpage' instead of the default (if
 956                         # that's not empty).
 957                         if( $this->mTitle->equals( Title::newMainPage() ) &&
 958                         wfMsgForContent( 'pagetitle-view-mainpage' ) !== '' ) {
 959                                 $wgOut->setHTMLTitle( wfMsgForContent( 'pagetitle-view-mainpage' ) );
 960                         }
 961                 }
 962
 963                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 964                 if( $ns == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
 965                         $wgOut->addWikiMsg('anontalkpagetext');
 966                 }
 967
 968                 # If we have been passed an &rcid= parameter, we want to give the user a
 969                 # chance to mark this new article as patrolled.
 970                 if( !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) && $this->mTitle->exists() ) {
 971                         $wgOut->addHTML(
 972                                 "<div class='patrollink'>" .
 973                                         wfMsgHtml( 'markaspatrolledlink',
 974                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
 975                                                 "action=markpatrolled&rcid=$rcid" )
 976                                         ) .
 977                                 '</div>'
 978                          );
 979                 }
 980
 981                 # Trackbacks
 982                 if ($wgUseTrackbacks)
 983                         $this->addTrackbacks();
 984
 985                 $this->viewUpdates();
 986                 wfProfileOut( __METHOD__ );
 987         }
 988
 989         /*
 990         * Should the parser cache be used?
 991         */
 992         protected function useParserCache( $oldid ) {
 993                 global $wgUser, $wgEnableParserCache;
 994
 995                 return $wgEnableParserCache
 996                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
 997                         && $this->exists()
 998                         && empty( $oldid )
 999                         && !$this->mTitle->isCssOrJsPage()
1000                         && !$this->mTitle->isCssJsSubpage();
1001         }
1002
1003         /**
1004          * View redirect
1005          * @param Title $target Title of destination to redirect
1006          * @param Bool  $appendSubtitle Object[optional]
1007          * @param Bool  $forceKnown Should the image be shown as a bluelink regardless of existence?
1008          */
1009         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1010                 global $wgParser, $wgOut, $wgContLang, $wgStylePath, $wgUser;
1011
1012                 # Display redirect
1013                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
1014                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
1015
1016                 if( $appendSubtitle ) {
1017                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1018                 }
1019                 $sk = $wgUser->getSkin();
1020                 if ( $forceKnown )
1021                         $link = $sk->makeKnownLinkObj( $target, htmlspecialchars( $target->getFullText() ) );
1022                 else
1023                         $link = $sk->makeLinkObj( $target, htmlspecialchars( $target->getFullText() ) );
1024
1025                 return '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
1026                         '<span class="redirectText">'.$link.'</span>';
1027
1028         }
1029
1030         function addTrackbacks() {
1031                 global $wgOut, $wgUser;
1032
1033                 $dbr = wfGetDB(DB_SLAVE);
1034                 $tbs = $dbr->select(
1035                                 /* FROM   */ 'trackbacks',
1036                                 /* SELECT */ array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
1037                                 /* WHERE  */ array('tb_page' => $this->getID())
1038                 );
1039
1040                 if (!$dbr->numrows($tbs))
1041                         return;
1042
1043                 $tbtext = "";
1044                 while ($o = $dbr->fetchObject($tbs)) {
1045                         $rmvtxt = "";
1046                         if ($wgUser->isAllowed( 'trackback' )) {
1047                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid="
1048                                                 . $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1049                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1050                         }
1051                         $tbtext .= "\n";
1052                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
1053                                         $o->tb_title,
1054                                         $o->tb_url,
1055                                         $o->tb_ex,
1056                                         $o->tb_name,
1057                                         $rmvtxt);
1058                 }
1059                 $wgOut->addWikiMsg( 'trackbackbox', $tbtext );
1060         }
1061
1062         function deletetrackback() {
1063                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
1064
1065                 if (!$wgUser->matchEditToken($wgRequest->getVal('token'))) {
1066                         $wgOut->addWikiMsg( 'sessionfailure' );
1067                         return;
1068                 }
1069
1070                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1071
1072                 if (count($permission_errors)>0)
1073                 {
1074                         $wgOut->showPermissionsErrorPage( $permission_errors );
1075                         return;
1076                 }
1077
1078                 $db = wfGetDB(DB_MASTER);
1079                 $db->delete('trackbacks', array('tb_id' => $wgRequest->getInt('tbid')));
1080                 $wgTitle->invalidateCache();
1081                 $wgOut->addWikiMsg('trackbackdeleteok');
1082         }
1083
1084         function render() {
1085                 global $wgOut;
1086
1087                 $wgOut->setArticleBodyOnly(true);
1088                 $this->view();
1089         }
1090
1091         /**
1092          * Handle action=purge
1093          */
1094         function purge() {
1095                 global $wgUser, $wgRequest, $wgOut;
1096
1097                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1098                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1099                                 $this->doPurge();
1100                                 $this->view();
1101                         }
1102                 } else {
1103                         $msg = $wgOut->parse( wfMsg( 'confirm_purge' ) );
1104                         $action = htmlspecialchars( $_SERVER['REQUEST_URI'] );
1105                         $button = htmlspecialchars( wfMsg( 'confirm_purge_button' ) );
1106                         $msg = str_replace( '$1',
1107                                 "<form method=\"post\" action=\"$action\">\n" .
1108                                 "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1109                                 "</form>\n", $msg );
1110
1111                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1112                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1113                         $wgOut->addHTML( $msg );
1114                 }
1115         }
1116
1117         /**
1118          * Perform the actions of a page purging
1119          */
1120         function doPurge() {
1121                 global $wgUseSquid;
1122                 // Invalidate the cache
1123                 $this->mTitle->invalidateCache();
1124
1125                 if ( $wgUseSquid ) {
1126                         // Commit the transaction before the purge is sent
1127                         $dbw = wfGetDB( DB_MASTER );
1128                         $dbw->immediateCommit();
1129
1130                         // Send purge
1131                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1132                         $update->doUpdate();
1133                 }
1134                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1135                         global $wgMessageCache;
1136                         if ( $this->getID() == 0 ) {
1137                                 $text = false;
1138                         } else {
1139                                 $text = $this->getContent();
1140                         }
1141                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1142                 }
1143         }
1144
1145         /**
1146          * Insert a new empty page record for this article.
1147          * This *must* be followed up by creating a revision
1148          * and running $this->updateToLatest( $rev_id );
1149          * or else the record will be left in a funky state.
1150          * Best if all done inside a transaction.
1151          *
1152          * @param Database $dbw
1153          * @return int     The newly created page_id key, or false if the title already existed
1154          * @private
1155          */
1156         function insertOn( $dbw ) {
1157                 wfProfileIn( __METHOD__ );
1158
1159                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1160                 $dbw->insert( 'page', array(
1161                         'page_id'           => $page_id,
1162                         'page_namespace'    => $this->mTitle->getNamespace(),
1163                         'page_title'        => $this->mTitle->getDBkey(),
1164                         'page_counter'      => 0,
1165                         'page_restrictions' => '',
1166                         'page_is_redirect'  => 0, # Will set this shortly...
1167                         'page_is_new'       => 1,
1168                         'page_random'       => wfRandom(),
1169                         'page_touched'      => $dbw->timestamp(),
1170                         'page_latest'       => 0, # Fill this in shortly...
1171                         'page_len'          => 0, # Fill this in shortly...
1172                 ), __METHOD__, 'IGNORE' );
1173
1174                 $affected = $dbw->affectedRows();
1175                 if ( $affected ) {
1176                         $newid = $dbw->insertId();
1177                         $this->mTitle->resetArticleId( $newid );
1178                 }
1179                 wfProfileOut( __METHOD__ );
1180                 return $affected ? $newid : false;
1181         }
1182
1183         /**
1184          * Update the page record to point to a newly saved revision.
1185          *
1186          * @param Database $dbw
1187          * @param Revision $revision For ID number, and text used to set
1188                                      length and redirect status fields
1189          * @param int $lastRevision If given, will not overwrite the page field
1190          *                          when different from the currently set value.
1191          *                          Giving 0 indicates the new page flag should
1192          *                          be set on.
1193          * @param bool $lastRevIsRedirect If given, will optimize adding and
1194          *                                                      removing rows in redirect table.
1195          * @return bool true on success, false on failure
1196          * @private
1197          */
1198         function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1199                 wfProfileIn( __METHOD__ );
1200
1201                 $text = $revision->getText();
1202                 $rt = Title::newFromRedirect( $text );
1203
1204                 $conditions = array( 'page_id' => $this->getId() );
1205                 if( !is_null( $lastRevision ) ) {
1206                         # An extra check against threads stepping on each other
1207                         $conditions['page_latest'] = $lastRevision;
1208                 }
1209
1210                 $dbw->update( 'page',
1211                         array( /* SET */
1212                                 'page_latest'      => $revision->getId(),
1213                                 'page_touched'     => $dbw->timestamp(),
1214                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1215                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1216                                 'page_len'         => strlen( $text ),
1217                         ),
1218                         $conditions,
1219                         __METHOD__ );
1220
1221                 $result = $dbw->affectedRows() != 0;
1222
1223                 if ($result) {
1224                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1225                 }
1226
1227                 wfProfileOut( __METHOD__ );
1228                 return $result;
1229         }
1230
1231         /**
1232          * Add row to the redirect table if this is a redirect, remove otherwise.
1233          *
1234          * @param Database $dbw
1235          * @param $redirectTitle a title object pointing to the redirect target,
1236          *                                                      or NULL if this is not a redirect
1237          * @param bool $lastRevIsRedirect If given, will optimize adding and
1238          *                                                      removing rows in redirect table.
1239          * @return bool true on success, false on failure
1240          * @private
1241          */
1242         function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1243
1244                 // Always update redirects (target link might have changed)
1245                 // Update/Insert if we don't know if the last revision was a redirect or not
1246                 // Delete if changing from redirect to non-redirect
1247                 $isRedirect = !is_null($redirectTitle);
1248                 if ($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1249
1250                         wfProfileIn( __METHOD__ );
1251
1252                         if ($isRedirect) {
1253
1254                                 // This title is a redirect, Add/Update row in the redirect table
1255                                 $set = array( /* SET */
1256                                         'rd_namespace' => $redirectTitle->getNamespace(),
1257                                         'rd_title'     => $redirectTitle->getDBkey(),
1258                                         'rd_from'      => $this->getId(),
1259                                 );
1260
1261                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1262                         } else {
1263                                 // This is not a redirect, remove row from redirect table
1264                                 $where = array( 'rd_from' => $this->getId() );
1265                                 $dbw->delete( 'redirect', $where, __METHOD__);
1266                         }
1267
1268                         if( $this->getTitle()->getNamespace() == NS_IMAGE )
1269                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1270                         wfProfileOut( __METHOD__ );
1271                         return ( $dbw->affectedRows() != 0 );
1272                 }
1273
1274                 return true;
1275         }
1276
1277         /**
1278          * If the given revision is newer than the currently set page_latest,
1279          * update the page record. Otherwise, do nothing.
1280          *
1281          * @param Database $dbw
1282          * @param Revision $revision
1283          */
1284         function updateIfNewerOn( &$dbw, $revision ) {
1285                 wfProfileIn( __METHOD__ );
1286
1287                 $row = $dbw->selectRow(
1288                         array( 'revision', 'page' ),
1289                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1290                         array(
1291                                 'page_id' => $this->getId(),
1292                                 'page_latest=rev_id' ),
1293                         __METHOD__ );
1294                 if( $row ) {
1295                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1296                                 wfProfileOut( __METHOD__ );
1297                                 return false;
1298                         }
1299                         $prev = $row->rev_id;
1300                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1301                 } else {
1302                         # No or missing previous revision; mark the page as new
1303                         $prev = 0;
1304                         $lastRevIsRedirect = null;
1305                 }
1306
1307                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1308                 wfProfileOut( __METHOD__ );
1309                 return $ret;
1310         }
1311
1312         /**
1313          * @return string Complete article text, or null if error
1314          */
1315         function replaceSection($section, $text, $summary = '', $edittime = NULL) {
1316                 wfProfileIn( __METHOD__ );
1317
1318                 if( $section == '' ) {
1319                         // Whole-page edit; let the text through unmolested.
1320                 } else {
1321                         if( is_null( $edittime ) ) {
1322                                 $rev = Revision::newFromTitle( $this->mTitle );
1323                         } else {
1324                                 $dbw = wfGetDB( DB_MASTER );
1325                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1326                         }
1327                         if( is_null( $rev ) ) {
1328                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1329                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1330                                 return null;
1331                         }
1332                         $oldtext = $rev->getText();
1333
1334                         if( $section == 'new' ) {
1335                                 # Inserting a new section
1336                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1337                                 $text = strlen( trim( $oldtext ) ) > 0
1338                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1339                                                 : "{$subject}{$text}";
1340                         } else {
1341                                 # Replacing an existing section; roll out the big guns
1342                                 global $wgParser;
1343                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1344                         }
1345
1346                 }
1347
1348                 wfProfileOut( __METHOD__ );
1349                 return $text;
1350         }
1351
1352         /**
1353          * @deprecated use Article::doEdit()
1354          */
1355         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1356                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1357                         ( $isminor ? EDIT_MINOR : 0 ) |
1358                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1359                         ( $bot ? EDIT_FORCE_BOT : 0 );
1360
1361                 # If this is a comment, add the summary as headline
1362                 if ( $comment && $summary != "" ) {
1363                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1364                 }
1365
1366                 $this->doEdit( $text, $summary, $flags );
1367
1368                 $dbw = wfGetDB( DB_MASTER );
1369                 if ($watchthis) {
1370                         if (!$this->mTitle->userIsWatching()) {
1371                                 $dbw->begin();
1372                                 $this->doWatch();
1373                                 $dbw->commit();
1374                         }
1375                 } else {
1376                         if ( $this->mTitle->userIsWatching() ) {
1377                                 $dbw->begin();
1378                                 $this->doUnwatch();
1379                                 $dbw->commit();
1380                         }
1381                 }
1382                 $this->doRedirect( $this->isRedirect( $text ) );
1383         }
1384
1385         /**
1386          * @deprecated use Article::doEdit()
1387          */
1388         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1389                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1390                         ( $minor ? EDIT_MINOR : 0 ) |
1391                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1392
1393                 $status = $this->doEdit( $text, $summary, $flags );
1394                 if ( !$status->isOK() ) {
1395                         return false;
1396                 }
1397
1398                 $dbw = wfGetDB( DB_MASTER );
1399                 if ($watchthis) {
1400                         if (!$this->mTitle->userIsWatching()) {
1401                                 $dbw->begin();
1402                                 $this->doWatch();
1403                                 $dbw->commit();
1404                         }
1405                 } else {
1406                         if ( $this->mTitle->userIsWatching() ) {
1407                                 $dbw->begin();
1408                                 $this->doUnwatch();
1409                                 $dbw->commit();
1410                         }
1411                 }
1412
1413                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1414                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1415
1416                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1417                 return true;
1418         }
1419
1420         /**
1421          * Article::doEdit()
1422          *
1423          * Change an existing article or create a new article. Updates RC and all necessary caches,
1424          * optionally via the deferred update array.
1425          *
1426          * $wgUser must be set before calling this function.
1427          *
1428          * @param string $text New text
1429          * @param string $summary Edit summary
1430          * @param integer $flags bitfield:
1431          *      EDIT_NEW
1432          *          Article is known or assumed to be non-existent, create a new one
1433          *      EDIT_UPDATE
1434          *          Article is known or assumed to be pre-existing, update it
1435          *      EDIT_MINOR
1436          *          Mark this edit minor, if the user is allowed to do so
1437          *      EDIT_SUPPRESS_RC
1438          *          Do not log the change in recentchanges
1439          *      EDIT_FORCE_BOT
1440          *          Mark the edit a "bot" edit regardless of user rights
1441          *      EDIT_DEFER_UPDATES
1442          *          Defer some of the updates until the end of index.php
1443          *      EDIT_AUTOSUMMARY
1444          *          Fill in blank summaries with generated text where possible
1445          *
1446          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1447          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1448          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1449          * edit-already-exists error will be returned. These two conditions are also possible with
1450          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1451          *
1452          * @param $baseRevId, the revision ID this edit was based off, if any
1453          *
1454          * @return Status object. Possible errors:
1455          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1456          *     edit-gone-missing:       In update mode, but the article didn't exist
1457          *     edit-conflict:           In update mode, the article changed unexpectedly
1458          *     edit-no-change:          Warning that the text was the same as before
1459          *     edit-already-exists:     In creation mode, but the article already exists
1460          *
1461          *  Extensions may define additional errors.
1462          *
1463          *  $return->value will contain an associative array with members as follows:
1464          *     new:                     Boolean indicating if the function attempted to create a new article
1465          *     revision:                The revision object for the inserted revision, or null
1466          *
1467          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1468          */
1469         function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1470                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1471
1472                 # Low-level sanity check
1473                 if( $this->mTitle->getText() == '' ) {
1474                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1475                 }
1476
1477                 wfProfileIn( __METHOD__ );
1478
1479                 if ($user == null) {
1480                         $user = $wgUser;
1481                 }
1482                 $status = Status::newGood( array() );
1483
1484                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1485                 $this->loadPageData();
1486
1487                 if ( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1488                         $aid = $this->mTitle->getArticleID();
1489                         if ( $aid ) {
1490                                 $flags |= EDIT_UPDATE;
1491                         } else {
1492                                 $flags |= EDIT_NEW;
1493                         }
1494                 }
1495
1496                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text,
1497                         &$summary, $flags & EDIT_MINOR,
1498                         null, null, &$flags, &$status ) ) )
1499                 {
1500                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1501                         wfProfileOut( __METHOD__ );
1502                         if ( $status->isOK() ) {
1503                                 $status->fatal( 'edit-hook-aborted');
1504                         }
1505                         return $status;
1506                 }
1507
1508                 # Silently ignore EDIT_MINOR if not allowed
1509                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed('minoredit');
1510                 $bot = $flags & EDIT_FORCE_BOT;
1511
1512                 $oldtext = $this->getContent();
1513                 $oldsize = strlen( $oldtext );
1514
1515                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1516                 if( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1517                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1518                 }
1519
1520                 $editInfo = $this->prepareTextForEdit( $text );
1521                 $text = $editInfo->pst;
1522                 $newsize = strlen( $text );
1523
1524                 $dbw = wfGetDB( DB_MASTER );
1525                 $now = wfTimestampNow();
1526
1527                 if ( $flags & EDIT_UPDATE ) {
1528                         # Update article, but only if changed.
1529                         $status->value['new'] = false;
1530
1531                         # Make sure the revision is either completely inserted or not inserted at all
1532                         if( !$wgDBtransactions ) {
1533                                 $userAbort = ignore_user_abort( true );
1534                         }
1535
1536                         $revisionId = 0;
1537
1538                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1539
1540                         if ( $changed ) {
1541                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1542                                   - (int)$this->isCountable( $oldtext );
1543                                 $this->mTotalAdjustment = 0;
1544
1545                                 if ( !$this->mLatest ) {
1546                                         # Article gone missing
1547                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1548                                         $status->fatal( 'edit-gone-missing' );
1549                                         wfProfileOut( __METHOD__ );
1550                                         return $status;
1551                                 }
1552
1553                                 $revision = new Revision( array(
1554                                         'page'       => $this->getId(),
1555                                         'comment'    => $summary,
1556                                         'minor_edit' => $isminor,
1557                                         'text'       => $text,
1558                                         'parent_id'  => $this->mLatest,
1559                                         'user'       => $user->getId(),
1560                                         'user_text'  => $user->getName(),
1561                                         ) );
1562
1563                                 $dbw->begin();
1564                                 $revisionId = $revision->insertOn( $dbw );
1565
1566                                 # Update page
1567                                 #
1568                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1569                                 # during the course of this function. This makes sure that EditPage can detect
1570                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1571                                 # before this function is called. A previous function used a separate query, this
1572                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1573                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1574
1575                                 if( !$ok ) {
1576                                         /* Belated edit conflict! Run away!! */
1577                                         $status->fatal( 'edit-conflict' );
1578                                         # Delete the invalid revision if the DB is not transactional
1579                                         if ( !$wgDBtransactions ) {
1580                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1581                                         }
1582                                         $revisionId = 0;
1583                                         $dbw->rollback();
1584                                 } else {
1585                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId ) );
1586
1587                                         # Update recentchanges
1588                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1589                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1590                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1591                                                         $revisionId );
1592
1593                                                 # Mark as patrolled if the user can do so
1594                                                 if( $GLOBALS['wgUseRCPatrol'] && $user->isAllowed( 'autopatrol' ) ) {
1595                                                         RecentChange::markPatrolled( $rc, true );
1596                                                 }
1597                                         }
1598                                         $user->incEditCount();
1599                                         $dbw->commit();
1600                                 }
1601                         } else {
1602                                 $status->warning( 'edit-no-change' );
1603                                 $revision = null;
1604                                 // Keep the same revision ID, but do some updates on it
1605                                 $revisionId = $this->getRevIdFetched();
1606                                 // Update page_touched, this is usually implicit in the page update
1607                                 // Other cache updates are done in onArticleEdit()
1608                                 $this->mTitle->invalidateCache();
1609                         }
1610
1611                         if( !$wgDBtransactions ) {
1612                                 ignore_user_abort( $userAbort );
1613                         }
1614                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1615                         if ( !$status->isOK() ) {
1616                                 wfProfileOut( __METHOD__ );
1617                                 return $status;
1618                         }
1619
1620                         # Invalidate cache of this article and all pages using this article
1621                         # as a template. Partly deferred.
1622                         Article::onArticleEdit( $this->mTitle, false ); // leave templatelinks for editUpdates()
1623                         # Update links tables, site stats, etc.
1624                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1625                 } else {
1626                         # Create new article
1627                         $status->value['new'] = true;
1628
1629                         # Set statistics members
1630                         # We work out if it's countable after PST to avoid counter drift
1631                         # when articles are created with {{subst:}}
1632                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1633                         $this->mTotalAdjustment = 1;
1634
1635                         $dbw->begin();
1636
1637                         # Add the page record; stake our claim on this title!
1638                         # This will return false if the article already exists
1639                         $newid = $this->insertOn( $dbw );
1640
1641                         if ( $newid === false ) {
1642                                 $dbw->rollback();
1643                                 $status->fatal( 'edit-already-exists' );
1644                                 wfProfileOut( __METHOD__ );
1645                                 return $status;
1646                         }
1647
1648                         # Save the revision text...
1649                         $revision = new Revision( array(
1650                                 'page'       => $newid,
1651                                 'comment'    => $summary,
1652                                 'minor_edit' => $isminor,
1653                                 'text'       => $text,
1654                                 'user'       => $user->getId(),
1655                                 'user_text'  => $user->getName(),
1656                                 ) );
1657                         $revisionId = $revision->insertOn( $dbw );
1658
1659                         $this->mTitle->resetArticleID( $newid );
1660
1661                         # Update the page record with revision data
1662                         $this->updateRevisionOn( $dbw, $revision, 0 );
1663
1664                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false) );
1665
1666                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1667                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1668                                   '', strlen( $text ), $revisionId );
1669                                 # Mark as patrolled if the user can
1670                                 if( ($GLOBALS['wgUseRCPatrol'] || $GLOBALS['wgUseNPPatrol']) && $user->isAllowed( 'autopatrol' ) ) {
1671                                         RecentChange::markPatrolled( $rc, true );
1672                                 }
1673                         }
1674                         $user->incEditCount();
1675                         $dbw->commit();
1676
1677                         # Update links, etc.
1678                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1679
1680                         # Clear caches
1681                         Article::onArticleCreate( $this->mTitle );
1682
1683                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1684                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1685                 }
1686
1687                 # Do updates right now unless deferral was requested
1688                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1689                         wfDoUpdates();
1690                 }
1691
1692                 // Return the new revision (or null) to the caller
1693                 $status->value['revision'] = $revision;
1694
1695                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1696                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status ) );
1697
1698                 wfProfileOut( __METHOD__ );
1699                 return $status;
1700         }
1701
1702         /**
1703          * @deprecated wrapper for doRedirect
1704          */
1705         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1706                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1707         }
1708
1709         /**
1710          * Output a redirect back to the article.
1711          * This is typically used after an edit.
1712          *
1713          * @param boolean $noRedir Add redirect=no
1714          * @param string $sectionAnchor section to redirect to, including "#"
1715          * @param string $extraQuery, extra query params
1716          */
1717         function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1718                 global $wgOut;
1719                 if ( $noRedir ) {
1720                         $query = 'redirect=no';
1721                         if( $extraQuery )
1722                                 $query .= "&$query";
1723                 } else {
1724                         $query = $extraQuery;
1725                 }
1726                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1727         }
1728
1729         /**
1730          * Mark this particular edit/page as patrolled
1731          */
1732         function markpatrolled() {
1733                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
1734                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1735
1736                 # If we haven't been given an rc_id value, we can't do anything
1737                 $rcid = (int) $wgRequest->getVal('rcid');
1738                 $rc = RecentChange::newFromId($rcid);
1739                 if ( is_null($rc) ) {
1740                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1741                         return;
1742                 }
1743
1744                 #It would be nice to see where the user had actually come from, but for now just guess
1745                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
1746                 $return = Title::makeTitle( NS_SPECIAL, $returnto );
1747
1748                 $dbw = wfGetDB( DB_MASTER );
1749                 $errors = $rc->doMarkPatrolled();
1750
1751                 if ( in_array(array('rcpatroldisabled'), $errors) ) {
1752                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1753                         return;
1754                 }
1755
1756                 if ( in_array(array('hookaborted'), $errors) ) {
1757                         // The hook itself has handled any output
1758                         return;
1759                 }
1760
1761                 if ( in_array(array('markedaspatrollederror-noautopatrol'), $errors) ) {
1762                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1763                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
1764                         $wgOut->returnToMain( false, $return );
1765                         return;
1766                 }
1767
1768                 if ( !empty($errors) ) {
1769                         $wgOut->showPermissionsErrorPage( $errors );
1770                         return;
1771                 }
1772
1773                 # Inform the user
1774                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1775                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
1776                 $wgOut->returnToMain( false, $return );
1777         }
1778
1779         /**
1780          * User-interface handler for the "watch" action
1781          */
1782
1783         function watch() {
1784
1785                 global $wgUser, $wgOut;
1786
1787                 if ( $wgUser->isAnon() ) {
1788                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1789                         return;
1790                 }
1791                 if ( wfReadOnly() ) {
1792                         $wgOut->readOnlyPage();
1793                         return;
1794                 }
1795
1796                 if( $this->doWatch() ) {
1797                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1798                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1799
1800                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
1801                 }
1802
1803                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1804         }
1805
1806         /**
1807          * Add this page to $wgUser's watchlist
1808          * @return bool true on successful watch operation
1809          */
1810         function doWatch() {
1811                 global $wgUser;
1812                 if( $wgUser->isAnon() ) {
1813                         return false;
1814                 }
1815
1816                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1817                         $wgUser->addWatch( $this->mTitle );
1818
1819                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1820                 }
1821
1822                 return false;
1823         }
1824
1825         /**
1826          * User interface handler for the "unwatch" action.
1827          */
1828         function unwatch() {
1829
1830                 global $wgUser, $wgOut;
1831
1832                 if ( $wgUser->isAnon() ) {
1833                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1834                         return;
1835                 }
1836                 if ( wfReadOnly() ) {
1837                         $wgOut->readOnlyPage();
1838                         return;
1839                 }
1840
1841                 if( $this->doUnwatch() ) {
1842                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1843                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1844
1845                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
1846                 }
1847
1848                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1849         }
1850
1851         /**
1852          * Stop watching a page
1853          * @return bool true on successful unwatch
1854          */
1855         function doUnwatch() {
1856                 global $wgUser;
1857                 if( $wgUser->isAnon() ) {
1858                         return false;
1859                 }
1860
1861                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1862                         $wgUser->removeWatch( $this->mTitle );
1863
1864                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1865                 }
1866
1867                 return false;
1868         }
1869
1870         /**
1871          * action=protect handler
1872          */
1873         function protect() {
1874                 $form = new ProtectionForm( $this );
1875                 $form->execute();
1876         }
1877
1878         /**
1879          * action=unprotect handler (alias)
1880          */
1881         function unprotect() {
1882                 $this->protect();
1883         }
1884
1885         /**
1886          * Update the article's restriction field, and leave a log entry.
1887          *
1888          * @param array $limit set of restriction keys
1889          * @param string $reason
1890          * @return bool true on success
1891          */
1892         function updateRestrictions( $limit = array(), $reason = '', $cascade = 0, $expiry = array() ) {
1893                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1894
1895                 $id = $this->mTitle->getArticleID();
1896                 if( array() != $this->mTitle->getUserPermissionsErrors( 'protect', $wgUser ) || wfReadOnly() || $id == 0 ) {
1897                         return false;
1898                 }
1899
1900                 if( !$cascade ) {
1901                         $cascade = false;
1902                 }
1903
1904                 // Take this opportunity to purge out expired restrictions
1905                 Title::purgeExpiredRestrictions();
1906
1907                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1908                 # we expect a single selection, but the schema allows otherwise.
1909                 $current = array();
1910                 $updated = Article::flattenRestrictions( $limit );
1911                 $changed = false;
1912                 foreach( $wgRestrictionTypes as $action ) {
1913                         $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1914                         $changed = ($changed || ($this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action]) );
1915                 }
1916
1917                 $current = Article::flattenRestrictions( $current );
1918
1919                 $changed = ($changed || ( $current != $updated ) );
1920                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
1921                 $protect = ( $updated != '' );
1922
1923                 # If nothing's changed, do nothing
1924                 if( $changed ) {
1925                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1926
1927                                 $dbw = wfGetDB( DB_MASTER );
1928
1929                                 # Prepare a null revision to be added to the history
1930                                 $modified = $current != '' && $protect;
1931                                 if( $protect ) {
1932                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1933                                 } else {
1934                                         $comment_type = 'unprotectedarticle';
1935                                 }
1936                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1937
1938                                 # Only restrictions with the 'protect' right can cascade...
1939                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1940                                 foreach( $limit as $action => $restriction ) {
1941                                         # FIXME: can $restriction be an array or what? (same as fixme above)
1942                                         if( $restriction != 'protect' && $restriction != 'sysop' ) {
1943                                                 $cascade = false;
1944                                                 break;
1945                                         }
1946                                 }
1947                                 $cascade_description = '';
1948                                 if( $cascade ) {
1949                                         $cascade_description = ' ['.wfMsgForContent('protect-summary-cascade').']';
1950                                 }
1951
1952                                 if( $reason )
1953                                         $comment .= ": $reason";
1954
1955                                 $editComment = $comment;
1956                                 $encodedExpiry = array();
1957                                 $protect_description = '';
1958                                 foreach( $limit as $action => $restrictions  ) {
1959                                         $encodedExpiry[$action] = Block::encodeExpiry($expiry[$action], $dbw );
1960                                         if( $restrictions != '' ) {
1961                                                 $protect_description .= "[$action=$restrictions] (";
1962                                                 if( $encodedExpiry[$action] != 'infinity' ) {
1963                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
1964                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) );
1965                                                 } else {
1966                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
1967                                                 }
1968                                                 $protect_description .= ') ';
1969                                         }
1970                                 }
1971                                 $protect_description = trim($protect_description);
1972
1973                                 if( $protect_description && $protect )
1974                                         $editComment .= " ($protect_description)";
1975                                 if( $cascade )
1976                                         $editComment .= "$cascade_description";
1977                                 # Update restrictions table
1978                                 foreach( $limit as $action => $restrictions ) {
1979                                         if ($restrictions != '' ) {
1980                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
1981                                                         array( 'pr_page' => $id,
1982                                                                 'pr_type' => $action,
1983                                                                 'pr_level' => $restrictions,
1984                                                                 'pr_cascade' => ($cascade && $action == 'edit') ? 1 : 0,
1985                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
1986                                         } else {
1987                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1988                                                         'pr_type' => $action ), __METHOD__ );
1989                                         }
1990                                 }
1991
1992                                 # Insert a null revision
1993                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1994                                 $nullRevId = $nullRevision->insertOn( $dbw );
1995
1996                                 $latest = $this->getLatest();
1997                                 # Update page record
1998                                 $dbw->update( 'page',
1999                                         array( /* SET */
2000                                                 'page_touched' => $dbw->timestamp(),
2001                                                 'page_restrictions' => '',
2002                                                 'page_latest' => $nullRevId
2003                                         ), array( /* WHERE */
2004                                                 'page_id' => $id
2005                                         ), 'Article::protect'
2006                                 );
2007
2008                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $nullRevision, $latest) );
2009                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2010
2011                                 # Update the protection log
2012                                 $log = new LogPage( 'protect' );
2013                                 if( $protect ) {
2014                                         $params = array($protect_description,$cascade ? 'cascade' : '');
2015                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason), $params );
2016                                 } else {
2017                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2018                                 }
2019
2020                         } # End hook
2021                 } # End "changed" check
2022
2023                 return true;
2024         }
2025
2026         /**
2027          * Take an array of page restrictions and flatten it to a string
2028          * suitable for insertion into the page_restrictions field.
2029          * @param array $limit
2030          * @return string
2031          * @private
2032          */
2033         function flattenRestrictions( $limit ) {
2034                 if( !is_array( $limit ) ) {
2035                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2036                 }
2037                 $bits = array();
2038                 ksort( $limit );
2039                 foreach( $limit as $action => $restrictions ) {
2040                         if( $restrictions != '' ) {
2041                                 $bits[] = "$action=$restrictions";
2042                         }
2043                 }
2044                 return implode( ':', $bits );
2045         }
2046
2047         /**
2048          * Auto-generates a deletion reason
2049          * @param bool &$hasHistory Whether the page has a history
2050          */
2051         public function generateReason( &$hasHistory ) {
2052                 global $wgContLang;
2053                 $dbw = wfGetDB( DB_MASTER );
2054                 // Get the last revision
2055                 $rev = Revision::newFromTitle( $this->mTitle );
2056                 if( is_null( $rev ) )
2057                         return false;
2058
2059                 // Get the article's contents
2060                 $contents = $rev->getText();
2061                 $blank = false;
2062                 // If the page is blank, use the text from the previous revision,
2063                 // which can only be blank if there's a move/import/protect dummy revision involved
2064                 if( $contents == '' ) {
2065                         $prev = $rev->getPrevious();
2066                         if( $prev )     {
2067                                 $contents = $prev->getText();
2068                                 $blank = true;
2069                         }
2070                 }
2071
2072                 // Find out if there was only one contributor
2073                 // Only scan the last 20 revisions
2074                 $limit = 20;
2075                 $res = $dbw->select( 'revision', 'rev_user_text',
2076                         array( 'rev_page' => $this->getID() ), __METHOD__,
2077                         array( 'LIMIT' => $limit )
2078                 );
2079                 if( $res === false )
2080                         // This page has no revisions, which is very weird
2081                         return false;
2082                 if( $res->numRows() > 1 )
2083                                 $hasHistory = true;
2084                 else
2085                                 $hasHistory = false;
2086                 $row = $dbw->fetchObject( $res );
2087                 $onlyAuthor = $row->rev_user_text;
2088                 // Try to find a second contributor
2089                 foreach( $res as $row ) {
2090                         if( $row->rev_user_text != $onlyAuthor ) {
2091                                 $onlyAuthor = false;
2092                                 break;
2093                         }
2094                 }
2095                 $dbw->freeResult( $res );
2096
2097                 // Generate the summary with a '$1' placeholder
2098                 if( $blank ) {
2099                         // The current revision is blank and the one before is also
2100                         // blank. It's just not our lucky day
2101                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2102                 } else {
2103                         if( $onlyAuthor )
2104                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2105                         else
2106                                 $reason = wfMsgForContent( 'excontent', '$1' );
2107                 }
2108
2109                 // Replace newlines with spaces to prevent uglyness
2110                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2111                 // Calculate the maximum amount of chars to get
2112                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2113                 $maxLength = 255 - (strlen( $reason ) - 2) - 3;
2114                 $contents = $wgContLang->truncate( $contents, $maxLength, '...' );
2115                 // Remove possible unfinished links
2116                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2117                 // Now replace the '$1' placeholder
2118                 $reason = str_replace( '$1', $contents, $reason );
2119                 return $reason;
2120         }
2121
2122
2123         /*
2124          * UI entry point for page deletion
2125          */
2126         function delete() {
2127                 global $wgUser, $wgOut, $wgRequest;
2128
2129                 $confirm = $wgRequest->wasPosted() &&
2130                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2131
2132                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2133                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2134
2135                 $reason = $this->DeleteReasonList;
2136
2137                 if ( $reason != 'other' && $this->DeleteReason != '') {
2138                         // Entry from drop down menu + additional comment
2139                         $reason .= ': ' . $this->DeleteReason;
2140                 } elseif ( $reason == 'other' ) {
2141                         $reason = $this->DeleteReason;
2142                 }
2143                 # Flag to hide all contents of the archived revisions
2144                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed('suppressrevision');
2145
2146                 # This code desperately needs to be totally rewritten
2147
2148                 # Read-only check...
2149                 if ( wfReadOnly() ) {
2150                         $wgOut->readOnlyPage();
2151                         return;
2152                 }
2153
2154                 # Check permissions
2155                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2156
2157                 if (count($permission_errors)>0) {
2158                         $wgOut->showPermissionsErrorPage( $permission_errors );
2159                         return;
2160                 }
2161
2162                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2163
2164                 # Better double-check that it hasn't been deleted yet!
2165                 $dbw = wfGetDB( DB_MASTER );
2166                 $conds = $this->mTitle->pageCond();
2167                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2168                 if ( $latest === false ) {
2169                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
2170                         return;
2171                 }
2172
2173                 # Hack for big sites
2174                 $bigHistory = $this->isBigDeletion();
2175                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2176                         global $wgLang, $wgDeleteRevisionsLimit;
2177                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2178                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2179                         return;
2180                 }
2181
2182                 if( $confirm ) {
2183                         $this->doDelete( $reason, $suppress );
2184                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2185                                 $this->doWatch();
2186                         } elseif( $this->mTitle->userIsWatching() ) {
2187                                 $this->doUnwatch();
2188                         }
2189                         return;
2190                 }
2191
2192                 // Generate deletion reason
2193                 $hasHistory = false;
2194                 if ( !$reason ) $reason = $this->generateReason($hasHistory);
2195
2196                 // If the page has a history, insert a warning
2197                 if( $hasHistory && !$confirm ) {
2198                         $skin=$wgUser->getSkin();
2199                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
2200                         if( $bigHistory ) {
2201                                 global $wgLang, $wgDeleteRevisionsLimit;
2202                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2203                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2204                         }
2205                 }
2206
2207                 return $this->confirmDelete( $reason );
2208         }
2209
2210         /**
2211          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2212          */
2213         function isBigDeletion() {
2214                 global $wgDeleteRevisionsLimit;
2215                 if( $wgDeleteRevisionsLimit ) {
2216                         $revCount = $this->estimateRevisionCount();
2217                         return $revCount > $wgDeleteRevisionsLimit;
2218                 }
2219                 return false;
2220         }
2221
2222         /**
2223          * @return int approximate revision count
2224          */
2225         function estimateRevisionCount() {
2226                 $dbr = wfGetDB( DB_SLAVE );
2227                 // For an exact count...
2228                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2229                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2230                 return $dbr->estimateRowCount( 'revision', '*',
2231                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2232         }
2233
2234         /**
2235          * Get the last N authors
2236          * @param int $num Number of revisions to get
2237          * @param string $revLatest The latest rev_id, selected from the master (optional)
2238          * @return array Array of authors, duplicates not removed
2239          */
2240         function getLastNAuthors( $num, $revLatest = 0 ) {
2241                 wfProfileIn( __METHOD__ );
2242
2243                 // First try the slave
2244                 // If that doesn't have the latest revision, try the master
2245                 $continue = 2;
2246                 $db = wfGetDB( DB_SLAVE );
2247                 do {
2248                         $res = $db->select( array( 'page', 'revision' ),
2249                                 array( 'rev_id', 'rev_user_text' ),
2250                                 array(
2251                                         'page_namespace' => $this->mTitle->getNamespace(),
2252                                         'page_title' => $this->mTitle->getDBkey(),
2253                                         'rev_page = page_id'
2254                                 ), __METHOD__, $this->getSelectOptions( array(
2255                                         'ORDER BY' => 'rev_timestamp DESC',
2256                                         'LIMIT' => $num
2257                                 ) )
2258                         );
2259                         if ( !$res ) {
2260                                 wfProfileOut( __METHOD__ );
2261                                 return array();
2262                         }
2263                         $row = $db->fetchObject( $res );
2264                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2265                                 $db = wfGetDB( DB_MASTER );
2266                                 $continue--;
2267                         } else {
2268                                 $continue = 0;
2269                         }
2270                 } while ( $continue );
2271
2272                 $authors = array( $row->rev_user_text );
2273                 while ( $row = $db->fetchObject( $res ) ) {
2274                         $authors[] = $row->rev_user_text;
2275                 }
2276                 wfProfileOut( __METHOD__ );
2277                 return $authors;
2278         }
2279
2280         /**
2281          * Output deletion confirmation dialog
2282          * @param $reason string Prefilled reason
2283          */
2284         function confirmDelete( $reason ) {
2285                 global $wgOut, $wgUser, $wgContLang;
2286                 $align = $wgContLang->isRtl() ? 'left' : 'right';
2287
2288                 wfDebug( "Article::confirmDelete\n" );
2289
2290                 $wgOut->setSubtitle( wfMsg( 'delete-backlink', $wgUser->getSkin()->makeKnownLinkObj( $this->mTitle ) ) );
2291                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2292                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2293
2294                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
2295                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\"><td></td><td>";
2296                         $suppress .= Xml::checkLabel( wfMsg( 'revdelete-suppress' ), 'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '2' ) );
2297                         $suppress .= "</td></tr>";
2298                 } else {
2299                         $suppress = '';
2300                 }
2301                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2302
2303                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2304                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2305                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2306                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2307                         Xml::openElement( 'table' ) .
2308                         "<tr id=\"wpDeleteReasonListRow\">
2309                                 <td align='$align'>" .
2310                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2311                                 "</td>
2312                                 <td>" .
2313                                         Xml::listDropDown( 'wpDeleteReasonList',
2314                                                 wfMsgForContent( 'deletereason-dropdown' ),
2315                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2316                                 "</td>
2317                         </tr>
2318                         <tr id=\"wpDeleteReasonRow\">
2319                                 <td align='$align'>" .
2320                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2321                                 "</td>
2322                                 <td>" .
2323                                         Xml::input( 'wpReason', 60, $reason, array( 'type' => 'text', 'maxlength' => '255',
2324                                                 'tabindex' => '2', 'id' => 'wpReason' ) ) .
2325                                 "</td>
2326                         </tr>
2327                         <tr>
2328                                 <td></td>
2329                                 <td>" .
2330                                         Xml::checkLabel( wfMsg( 'watchthis' ), 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2331                                 "</td>
2332                         </tr>
2333                         $suppress
2334                         <tr>
2335                                 <td></td>
2336                                 <td>" .
2337                                         Xml::submitButton( wfMsg( 'deletepage' ), array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '4' ) ) .
2338                                 "</td>
2339                         </tr>" .
2340                         Xml::closeElement( 'table' ) .
2341                         Xml::closeElement( 'fieldset' ) .
2342                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2343                         Xml::closeElement( 'form' );
2344
2345                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
2346                                 $skin = $wgUser->getSkin();
2347                                 $link = $skin->makeLink ( 'MediaWiki:Deletereason-dropdown', wfMsgHtml( 'delete-edit-reasonlist' ) );
2348                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2349                         }
2350
2351                 $wgOut->addHTML( $form );
2352                 $this->showLogExtract( $wgOut );
2353         }
2354
2355
2356         /**
2357          * Show relevant lines from the deletion log
2358          */
2359         function showLogExtract( $out ) {
2360                 $out->addHtml( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2361                 LogEventsList::showLogExtract( $out, 'delete', $this->mTitle->getPrefixedText() );
2362         }
2363
2364
2365         /**
2366          * Perform a deletion and output success or failure messages
2367          */
2368         function doDelete( $reason, $suppress = false ) {
2369                 global $wgOut, $wgUser;
2370                 wfDebug( __METHOD__."\n" );
2371
2372                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2373
2374                 $error = '';
2375
2376                 if ( wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason, &$error)) ) {
2377                         if ( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2378                                 $deleted = $this->mTitle->getPrefixedText();
2379
2380                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2381                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2382
2383                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2384
2385                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2386                                 $wgOut->returnToMain( false );
2387                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason, $id));
2388                         } else {
2389                                 if ($error = '')
2390                                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
2391                                 else
2392                                         $wgOut->showFatalError( $error );
2393                         }
2394                 }
2395         }
2396
2397         /**
2398          * Back-end article deletion
2399          * Deletes the article with database consistency, writes logs, purges caches
2400          * Returns success
2401          */
2402         function doDeleteArticle( $reason, $suppress = false, $id = 0 ) {
2403                 global $wgUseSquid, $wgDeferredUpdateList;
2404                 global $wgUseTrackbacks;
2405
2406                 wfDebug( __METHOD__."\n" );
2407
2408                 $dbw = wfGetDB( DB_MASTER );
2409                 $ns = $this->mTitle->getNamespace();
2410                 $t = $this->mTitle->getDBkey();
2411                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2412
2413                 if ( $t == '' || $id == 0 ) {
2414                         return false;
2415                 }
2416
2417                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
2418                 array_push( $wgDeferredUpdateList, $u );
2419
2420                 // Bitfields to further suppress the content
2421                 if ( $suppress ) {
2422                         $bitfield = 0;
2423                         // This should be 15...
2424                         $bitfield |= Revision::DELETED_TEXT;
2425                         $bitfield |= Revision::DELETED_COMMENT;
2426                         $bitfield |= Revision::DELETED_USER;
2427                         $bitfield |= Revision::DELETED_RESTRICTED;
2428                 } else {
2429                         $bitfield = 'rev_deleted';
2430                 }
2431
2432                 $dbw->begin();
2433                 // For now, shunt the revision data into the archive table.
2434                 // Text is *not* removed from the text table; bulk storage
2435                 // is left intact to avoid breaking block-compression or
2436                 // immutable storage schemes.
2437                 //
2438                 // For backwards compatibility, note that some older archive
2439                 // table entries will have ar_text and ar_flags fields still.
2440                 //
2441                 // In the future, we may keep revisions and mark them with
2442                 // the rev_deleted field, which is reserved for this purpose.
2443                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2444                         array(
2445                                 'ar_namespace'  => 'page_namespace',
2446                                 'ar_title'      => 'page_title',
2447                                 'ar_comment'    => 'rev_comment',
2448                                 'ar_user'       => 'rev_user',
2449                                 'ar_user_text'  => 'rev_user_text',
2450                                 'ar_timestamp'  => 'rev_timestamp',
2451                                 'ar_minor_edit' => 'rev_minor_edit',
2452                                 'ar_rev_id'     => 'rev_id',
2453                                 'ar_text_id'    => 'rev_text_id',
2454                                 'ar_text'       => '\'\'', // Be explicit to appease
2455                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2456                                 'ar_len'        => 'rev_len',
2457                                 'ar_page_id'    => 'page_id',
2458                                 'ar_deleted'    => $bitfield
2459                         ), array(
2460                                 'page_id' => $id,
2461                                 'page_id = rev_page'
2462                         ), __METHOD__
2463                 );
2464
2465                 # Delete restrictions for it
2466                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2467
2468                 # Now that it's safely backed up, delete it
2469                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2470                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2471                 if( !$ok ) {
2472                         $dbw->rollback();
2473                         return false;
2474                 }
2475
2476                 # If using cascading deletes, we can skip some explicit deletes
2477                 if ( !$dbw->cascadingDeletes() ) {
2478                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2479
2480                         if ($wgUseTrackbacks)
2481                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2482
2483                         # Delete outgoing links
2484                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2485                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2486                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2487                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2488                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2489                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2490                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2491                 }
2492
2493                 # If using cleanup triggers, we can skip some manual deletes
2494                 if ( !$dbw->cleanupTriggers() ) {
2495                         # Clean up recentchanges entries...
2496                         $dbw->delete( 'recentchanges',
2497                                 array( 'rc_type != '.RC_LOG, 'rc_cur_id' => $id ),
2498                                 __METHOD__ );
2499                 }
2500
2501                 # Clear caches
2502                 Article::onArticleDelete( $this->mTitle );
2503
2504                 # Fix category table counts
2505                 $cats = array();
2506                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2507                 foreach( $res as $row ) {
2508                         $cats []= $row->cl_to;
2509                 }
2510                 $this->updateCategoryCounts( array(), $cats );
2511
2512                 # Clear the cached article id so the interface doesn't act like we exist
2513                 $this->mTitle->resetArticleID( 0 );
2514                 $this->mTitle->mArticleID = 0;
2515
2516                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2517                 $logtype = $suppress ? 'suppress' : 'delete';
2518                 $log = new LogPage( $logtype );
2519
2520                 # Make sure logging got through
2521                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2522
2523                 $dbw->commit();
2524
2525                 return true;
2526         }
2527
2528         /**
2529          * Roll back the most recent consecutive set of edits to a page
2530          * from the same user; fails if there are no eligible edits to
2531          * roll back to, e.g. user is the sole contributor. This function
2532          * performs permissions checks on $wgUser, then calls commitRollback()
2533          * to do the dirty work
2534          *
2535          * @param string $fromP - Name of the user whose edits to rollback.
2536          * @param string $summary - Custom summary. Set to default summary if empty.
2537          * @param string $token - Rollback token.
2538          * @param bool   $bot - If true, mark all reverted edits as bot.
2539          *
2540          * @param array $resultDetails contains result-specific array of additional values
2541          *    'alreadyrolled' : 'current' (rev)
2542          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2543          *
2544          * @return array of errors, each error formatted as
2545          *   array(messagekey, param1, param2, ...).
2546          * On success, the array is empty.  This array can also be passed to
2547          * OutputPage::showPermissionsErrorPage().
2548          */
2549         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2550                 global $wgUser;
2551                 $resultDetails = null;
2552
2553                 # Check permissions
2554                 $errors = array_merge( $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser ),
2555                         $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser ) );
2556                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2557                         $errors[] = array( 'sessionfailure' );
2558
2559                 if ( $wgUser->pingLimiter('rollback') || $wgUser->pingLimiter() ) {
2560                         $errors[] = array( 'actionthrottledtext' );
2561                 }
2562                 # If there were errors, bail out now
2563                 if(!empty($errors))
2564                         return $errors;
2565
2566                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
2567         }
2568
2569         /**
2570          * Backend implementation of doRollback(), please refer there for parameter
2571          * and return value documentation
2572          *
2573          * NOTE: This function does NOT check ANY permissions, it just commits the
2574          * rollback to the DB Therefore, you should only call this function direct-
2575          * ly if you want to use custom permissions checks. If you don't, use
2576          * doRollback() instead.
2577          */
2578         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
2579                 global $wgUseRCPatrol, $wgUser, $wgLang;
2580                 $dbw = wfGetDB( DB_MASTER );
2581
2582                 if( wfReadOnly() ) {
2583                         return array( array( 'readonlytext' ) );
2584                 }
2585
2586                 # Get the last editor
2587                 $current = Revision::newFromTitle( $this->mTitle );
2588                 if( is_null( $current ) ) {
2589                         # Something wrong... no page?
2590                         return array(array('notanarticle'));
2591                 }
2592
2593                 $from = str_replace( '_', ' ', $fromP );
2594                 if( $from != $current->getUserText() ) {
2595                         $resultDetails = array( 'current' => $current );
2596                         return array(array('alreadyrolled',
2597                                 htmlspecialchars($this->mTitle->getPrefixedText()),
2598                                 htmlspecialchars($fromP),
2599                                 htmlspecialchars($current->getUserText())
2600                         ));
2601                 }
2602
2603                 # Get the last edit not by this guy
2604                 $user = intval( $current->getUser() );
2605                 $user_text = $dbw->addQuotes( $current->getUserText() );
2606                 $s = $dbw->selectRow( 'revision',
2607                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2608                         array(  'rev_page' => $current->getPage(),
2609                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
2610                         ), __METHOD__,
2611                         array(  'USE INDEX' => 'page_timestamp',
2612                                 'ORDER BY'  => 'rev_timestamp DESC' )
2613                         );
2614                 if( $s === false ) {
2615                         # No one else ever edited this page
2616                         return array(array('cantrollback'));
2617                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
2618                         # Only admins can see this text
2619                         return array(array('notvisiblerev'));
2620                 }
2621
2622                 $set = array();
2623                 if ( $bot && $wgUser->isAllowed('markbotedits') ) {
2624                         # Mark all reverted edits as bot
2625                         $set['rc_bot'] = 1;
2626                 }
2627                 if ( $wgUseRCPatrol ) {
2628                         # Mark all reverted edits as patrolled
2629                         $set['rc_patrolled'] = 1;
2630                 }
2631
2632                 if ( $set ) {
2633                         $dbw->update( 'recentchanges', $set,
2634                                         array( /* WHERE */
2635                                                 'rc_cur_id' => $current->getPage(),
2636                                                 'rc_user_text' => $current->getUserText(),
2637                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2638                                         ), __METHOD__
2639                                 );
2640                 }
2641
2642                 # Generate the edit summary if necessary
2643                 $target = Revision::newFromId( $s->rev_id );
2644                 if( empty( $summary ) ){
2645                         $summary = wfMsgForContent( 'revertpage' );
2646                 }
2647
2648                 # Allow the custom summary to use the same args as the default message
2649                 $args = array(
2650                         $target->getUserText(), $from, $s->rev_id,
2651                         $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
2652                         $current->getId(), $wgLang->timeanddate($current->getTimestamp())
2653                 );
2654                 $summary = wfMsgReplaceArgs( $summary, $args );
2655
2656                 # Save
2657                 $flags = EDIT_UPDATE;
2658
2659                 if( $wgUser->isAllowed('minoredit') )
2660                         $flags |= EDIT_MINOR;
2661
2662                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
2663                         $flags |= EDIT_FORCE_BOT;
2664                 # Actually store the edit
2665                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
2666                 if ( !empty( $status->value['revision'] ) ) {
2667                         $revId = $status->value['revision']->getId();
2668                 } else {
2669                         $revId = false;
2670                 }
2671
2672                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target ) );
2673
2674                 $resultDetails = array(
2675                         'summary' => $summary,
2676                         'current' => $current,
2677                         'target' => $target,
2678                         'newid' => $revId
2679                 );
2680                 return array();
2681         }
2682
2683         /**
2684          * User interface for rollback operations
2685          */
2686         function rollback() {
2687                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2688                 $details = null;
2689
2690                 $result = $this->doRollback(
2691                         $wgRequest->getVal( 'from' ),
2692                         $wgRequest->getText( 'summary' ),
2693                         $wgRequest->getVal( 'token' ),
2694                         $wgRequest->getBool( 'bot' ),
2695                         $details
2696                 );
2697
2698                 if( in_array( array( 'blocked' ), $result ) ) {
2699                         $wgOut->blockedPage();
2700                         return;
2701                 }
2702                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
2703                         $wgOut->rateLimited();
2704                         return;
2705                 }
2706                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
2707                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2708                         $errArray = $result[0];
2709                         $errMsg = array_shift( $errArray );
2710                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
2711                         if( isset( $details['current'] ) ){
2712                                 $current = $details['current'];
2713                                 if( $current->getComment() != '' ) {
2714                                         $wgOut->addWikiMsgArray( 'editcomment', array(
2715                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
2716                                 }
2717                         }
2718                         return;
2719                 }
2720                 # Display permissions errors before read-only message -- there's no
2721                 # point in misleading the user into thinking the inability to rollback
2722                 # is only temporary.
2723                 if( !empty($result) && $result !== array( array('readonlytext') ) ) {
2724                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
2725                         # move any 'readonlytext' error manually.
2726                         $out = array();
2727                         foreach( $result as $error ) {
2728                                 if( $error != array( 'readonlytext' ) ) {
2729                                         $out []= $error;
2730                                 }
2731                         }
2732                         $wgOut->showPermissionsErrorPage( $out );
2733                         return;
2734                 }
2735                 if( $result == array( array('readonlytext') ) ) {
2736                         $wgOut->readOnlyPage();
2737                         return;
2738                 }
2739
2740                 $current = $details['current'];
2741                 $target = $details['target'];
2742                 $newId = $details['newid'];
2743                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2744                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2745                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2746                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2747                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2748                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2749                 $wgOut->addHtml( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2750                 $wgOut->returnToMain( false, $this->mTitle );
2751
2752                 if( !$wgRequest->getBool( 'hidediff', false ) ) {
2753                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
2754                         $de->showDiff( '', '' );
2755                 }
2756         }
2757
2758
2759         /**
2760          * Do standard deferred updates after page view
2761          * @private
2762          */
2763         function viewUpdates() {
2764                 global $wgDeferredUpdateList, $wgUser;
2765
2766                 if ( 0 != $this->getID() ) {
2767                         # Don't update page view counters on views from bot users (bug 14044)
2768                         global $wgDisableCounters;
2769                         if( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) ) {
2770                                 Article::incViewCount( $this->getID() );
2771                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2772                                 array_push( $wgDeferredUpdateList, $u );
2773                         }
2774                 }
2775
2776                 # Update newtalk / watchlist notification status
2777                 $wgUser->clearNotification( $this->mTitle );
2778         }
2779
2780         /**
2781          * Prepare text which is about to be saved.
2782          * Returns a stdclass with source, pst and output members
2783          */
2784         function prepareTextForEdit( $text, $revid=null ) {
2785                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
2786                         // Already prepared
2787                         return $this->mPreparedEdit;
2788                 }
2789                 global $wgParser;
2790                 $edit = (object)array();
2791                 $edit->revid = $revid;
2792                 $edit->newText = $text;
2793                 $edit->pst = $this->preSaveTransform( $text );
2794                 $options = new ParserOptions;
2795                 $options->setTidy( true );
2796                 $options->enableLimitReport();
2797                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
2798                 $edit->oldText = $this->getContent();
2799                 $this->mPreparedEdit = $edit;
2800                 return $edit;
2801         }
2802
2803         /**
2804          * Do standard deferred updates after page edit.
2805          * Update links tables, site stats, search index and message cache.
2806          * Purges pages that include this page if the text was changed here.
2807          * Every 100th edit, prune the recent changes table.
2808          *
2809          * @private
2810          * @param $text New text of the article
2811          * @param $summary Edit summary
2812          * @param $minoredit Minor edit
2813          * @param $timestamp_of_pagechange Timestamp associated with the page change
2814          * @param $newid rev_id value of the new revision
2815          * @param $changed Whether or not the content actually changed
2816          */
2817         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2818                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
2819
2820                 wfProfileIn( __METHOD__ );
2821
2822                 # Parse the text
2823                 # Be careful not to double-PST: $text is usually already PST-ed once
2824                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2825                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2826                         $editInfo = $this->prepareTextForEdit( $text, $newid );
2827                 } else {
2828                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2829                         $editInfo = $this->mPreparedEdit;
2830                 }
2831
2832                 # Save it to the parser cache
2833                 if ( $wgEnableParserCache ) {
2834                         $parserCache = ParserCache::singleton();
2835                         $parserCache->save( $editInfo->output, $this, $wgUser );
2836                 }
2837
2838                 # Update the links tables
2839                 $u = new LinksUpdate( $this->mTitle, $editInfo->output, false );
2840                 $u->setRecursiveTouch( $changed ); // refresh/invalidate including pages too
2841                 $u->doUpdate();
2842
2843                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
2844
2845                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2846                         if ( 0 == mt_rand( 0, 99 ) ) {
2847                                 // Flush old entries from the `recentchanges` table; we do this on
2848                                 // random requests so as to avoid an increase in writes for no good reason
2849                                 global $wgRCMaxAge;
2850                                 $dbw = wfGetDB( DB_MASTER );
2851                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2852                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2853                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2854                                 $dbw->query( $sql );
2855                         }
2856                 }
2857
2858                 $id = $this->getID();
2859                 $title = $this->mTitle->getPrefixedDBkey();
2860                 $shortTitle = $this->mTitle->getDBkey();
2861
2862                 if ( 0 == $id ) {
2863                         wfProfileOut( __METHOD__ );
2864                         return;
2865                 }
2866
2867                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2868                 array_push( $wgDeferredUpdateList, $u );
2869                 $u = new SearchUpdate( $id, $title, $text );
2870                 array_push( $wgDeferredUpdateList, $u );
2871
2872                 # If this is another user's talk page, update newtalk
2873                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2874                 # load of user talk pages and piss people off, nor if it's a minor edit
2875                 # by a properly-flagged bot.
2876                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2877                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
2878                         if( wfRunHooks('ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2879                                 $other = User::newFromName( $shortTitle, false );
2880                                 if ( !$other ) {
2881                                         wfDebug( __METHOD__.": invalid username\n" );
2882                                 } elseif( User::isIP( $shortTitle ) ) {
2883                                         // An anonymous user
2884                                         $other->setNewtalk( true );
2885                                 } elseif( $other->isLoggedIn() ) {
2886                                         $other->setNewtalk( true );
2887                                 } else {
2888                                         wfDebug( __METHOD__. ": don't need to notify a nonexistent user\n" );
2889                                 }
2890                         }
2891                 }
2892
2893                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2894                         $wgMessageCache->replace( $shortTitle, $text );
2895                 }
2896
2897                 wfProfileOut( __METHOD__ );
2898         }
2899
2900         /**
2901          * Perform article updates on a special page creation.
2902          *
2903          * @param Revision $rev
2904          *
2905          * @todo This is a shitty interface function. Kill it and replace the
2906          * other shitty functions like editUpdates and such so it's not needed
2907          * anymore.
2908          */
2909         function createUpdates( $rev ) {
2910                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2911                 $this->mTotalAdjustment = 1;
2912                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2913                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2914         }
2915
2916         /**
2917          * Generate the navigation links when browsing through an article revisions
2918          * It shows the information as:
2919          *   Revision as of \<date\>; view current revision
2920          *   \<- Previous version | Next Version -\>
2921          *
2922          * @private
2923          * @param string $oldid         Revision ID of this article revision
2924          */
2925         function setOldSubtitle( $oldid=0 ) {
2926                 global $wgLang, $wgOut, $wgUser;
2927
2928                 if ( !wfRunHooks( 'DisplayOldSubtitle', array(&$this, &$oldid) ) ) {
2929                                 return;
2930                 }
2931
2932                 $revision = Revision::newFromId( $oldid );
2933
2934                 $current = ( $oldid == $this->mLatest );
2935                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2936                 $sk = $wgUser->getSkin();
2937                 $lnk = $current
2938                         ? wfMsg( 'currentrevisionlink' )
2939                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2940                 $curdiff = $current
2941                         ? wfMsg( 'diff' )
2942                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=cur&oldid='.$oldid );
2943                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2944                 $prevlink = $prev
2945                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2946                         : wfMsg( 'previousrevision' );
2947                 $prevdiff = $prev
2948                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=prev&oldid='.$oldid )
2949                         : wfMsg( 'diff' );
2950                 $nextlink = $current
2951                         ? wfMsg( 'nextrevision' )
2952                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2953                 $nextdiff = $current
2954                         ? wfMsg( 'diff' )
2955                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=next&oldid='.$oldid );
2956
2957                 $cdel='';
2958                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
2959                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
2960                         if( $revision->isCurrent() ) {
2961                         // We don't handle top deleted edits too well
2962                                 $cdel = wfMsgHtml('rev-delundel');
2963                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
2964                         // If revision was hidden from sysops
2965                                 $cdel = wfMsgHtml('rev-delundel');
2966                         } else {
2967                                 $cdel = $sk->makeKnownLinkObj( $revdel,
2968                                         wfMsgHtml('rev-delundel'),
2969                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
2970                                         '&oldid=' . urlencode( $oldid ) );
2971                                 // Bolden oversighted content
2972                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
2973                                         $cdel = "<strong>$cdel</strong>";
2974                         }
2975                         $cdel = "(<small>$cdel</small>) ";
2976                 }
2977                 # Show user links if allowed to see them. Normally they
2978                 # are hidden regardless, but since we can already see the text here...
2979                 $userlinks = $sk->revUserTools( $revision, false );
2980
2981                 $m = wfMsg( 'revision-info-current' );
2982                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
2983                         ? 'revision-info-current'
2984                         : 'revision-info';
2985
2986                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsg( $infomsg, $td, $userlinks ) . "</div>\n" .
2987
2988                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsg( 'revision-nav', $prevdiff,
2989                                 $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
2990                 $wgOut->setSubtitle( $r );
2991         }
2992
2993         /**
2994          * This function is called right before saving the wikitext,
2995          * so we can do things like signatures and links-in-context.
2996          *
2997          * @param string $text
2998          */
2999         function preSaveTransform( $text ) {
3000                 global $wgParser, $wgUser;
3001                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3002         }
3003
3004         /* Caching functions */
3005
3006         /**
3007          * checkLastModified returns true if it has taken care of all
3008          * output to the client that is necessary for this request.
3009          * (that is, it has sent a cached version of the page)
3010          */
3011         function tryFileCache() {
3012                 static $called = false;
3013                 if( $called ) {
3014                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3015                         return false;
3016                 }
3017                 $called = true;
3018                 if( $this->isFileCacheable() ) {
3019                         $touched = $this->mTouched;
3020                         $cache = new HTMLFileCache( $this->mTitle );
3021                         if( $cache->isFileCacheGood( $touched ) ) {
3022                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3023                                 $cache->loadFromFileCache();
3024                                 return true;
3025                         } else {
3026                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3027                                 ob_start( array(&$cache, 'saveToFileCache' ) );
3028                         }
3029                 } else {
3030                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3031                 }
3032                 return false;
3033         }
3034
3035         /**
3036          * Check if the page can be cached
3037          * @return bool
3038          */
3039         function isFileCacheable() {
3040                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest, $wgLang, $wgContLang;
3041                 // Get all query values
3042                 $queryVals = $wgRequest->getValues();
3043                 foreach( $queryVals as $query => $val ) {
3044                         if( $query == 'title' || ($query == 'action' && $val == 'view') ) {
3045                                 // Normal page view in query form
3046                         } else {
3047                                 return false;
3048                         }
3049                 }
3050                 // Check for non-standard user language; this covers uselang,
3051                 // and extensions for auto-detecting user language.
3052                 $ulang = $wgLang->getCode();
3053                 $clang = $wgContLang->getCode();
3054
3055                 $cacheable = $wgUseFileCache
3056                         && (!$wgShowIPinHeader)
3057                         && ($this->getID() > 0)
3058                         && ($wgUser->isAnon())
3059                         && (!$wgUser->getNewtalk())
3060                         && (!$this->mRedirectedFrom)
3061                         && ($ulang === $clang);
3062                 // Extension may have reason to disable file caching on some pages.
3063                 if( $cacheable ) {
3064                         $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3065                 }
3066                 return $cacheable;
3067         }
3068
3069         /**
3070          * Loads page_touched and returns a value indicating if it should be used
3071          *
3072          */
3073         function checkTouched() {
3074                 if( !$this->mDataLoaded ) {
3075                         $this->loadPageData();
3076                 }
3077                 return !$this->mIsRedirect;
3078         }
3079
3080         /**
3081          * Get the page_touched field
3082          */
3083         function getTouched() {
3084                 # Ensure that page data has been loaded
3085                 if( !$this->mDataLoaded ) {
3086                         $this->loadPageData();
3087                 }
3088                 return $this->mTouched;
3089         }
3090
3091         /**
3092          * Get the page_latest field
3093          */
3094         function getLatest() {
3095                 if ( !$this->mDataLoaded ) {
3096                         $this->loadPageData();
3097                 }
3098                 return $this->mLatest;
3099         }
3100
3101         /**
3102          * Edit an article without doing all that other stuff
3103          * The article must already exist; link tables etc
3104          * are not updated, caches are not flushed.
3105          *
3106          * @param string $text text submitted
3107          * @param string $comment comment submitted
3108          * @param bool $minor whereas it's a minor modification
3109          */
3110         function quickEdit( $text, $comment = '', $minor = 0 ) {
3111                 wfProfileIn( __METHOD__ );
3112
3113                 $dbw = wfGetDB( DB_MASTER );
3114                 $revision = new Revision( array(
3115                         'page'       => $this->getId(),
3116                         'text'       => $text,
3117                         'comment'    => $comment,
3118                         'minor_edit' => $minor ? 1 : 0,
3119                         ) );
3120                 $revision->insertOn( $dbw );
3121                 $this->updateRevisionOn( $dbw, $revision );
3122
3123                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false) );
3124
3125                 wfProfileOut( __METHOD__ );
3126         }
3127
3128         /**
3129          * Used to increment the view counter
3130          *
3131          * @static
3132          * @param integer $id article id
3133          */
3134         function incViewCount( $id ) {
3135                 $id = intval( $id );
3136                 global $wgHitcounterUpdateFreq, $wgDBtype;
3137
3138                 $dbw = wfGetDB( DB_MASTER );
3139                 $pageTable = $dbw->tableName( 'page' );
3140                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3141                 $acchitsTable = $dbw->tableName( 'acchits' );
3142
3143                 if( $wgHitcounterUpdateFreq <= 1 ) {
3144                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3145                         return;
3146                 }
3147
3148                 # Not important enough to warrant an error page in case of failure
3149                 $oldignore = $dbw->ignoreErrors( true );
3150
3151                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3152
3153                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
3154                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
3155                         # Most of the time (or on SQL errors), skip row count check
3156                         $dbw->ignoreErrors( $oldignore );
3157                         return;
3158                 }
3159
3160                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
3161                 $row = $dbw->fetchObject( $res );
3162                 $rown = intval( $row->n );
3163                 if( $rown >= $wgHitcounterUpdateFreq ){
3164                         wfProfileIn( 'Article::incViewCount-collect' );
3165                         $old_user_abort = ignore_user_abort( true );
3166
3167                         if ($wgDBtype == 'mysql')
3168                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
3169                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
3170                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
3171                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
3172                                 'GROUP BY hc_id');
3173                         $dbw->query("DELETE FROM $hitcounterTable");
3174                         if ($wgDBtype == 'mysql') {
3175                                 $dbw->query('UNLOCK TABLES');
3176                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3177                                         'WHERE page_id = hc_id');
3178                         }
3179                         else {
3180                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3181                                         "FROM $acchitsTable WHERE page_id = hc_id");
3182                         }
3183                         $dbw->query("DROP TABLE $acchitsTable");
3184
3185                         ignore_user_abort( $old_user_abort );
3186                         wfProfileOut( 'Article::incViewCount-collect' );
3187                 }
3188                 $dbw->ignoreErrors( $oldignore );
3189         }
3190
3191         /**#@+
3192          * The onArticle*() functions are supposed to be a kind of hooks
3193          * which should be called whenever any of the specified actions
3194          * are done.
3195          *
3196          * This is a good place to put code to clear caches, for instance.
3197          *
3198          * This is called on page move and undelete, as well as edit
3199          * @static
3200          * @param $title_obj a title object
3201          */
3202
3203         public static function onArticleCreate( $title ) {
3204                 # Update existence markers on article/talk tabs...
3205                 if ( $title->isTalkPage() ) {
3206                         $other = $title->getSubjectPage();
3207                 } else {
3208                         $other = $title->getTalkPage();
3209                 }
3210                 $other->invalidateCache();
3211                 $other->purgeSquid();
3212
3213                 $title->touchLinks();
3214                 $title->purgeSquid();
3215                 $title->deleteTitleProtection();
3216         }
3217
3218         public static function onArticleDelete( $title ) {
3219                 global $wgUseFileCache, $wgMessageCache;
3220                 # Update existence markers on article/talk tabs...
3221                 if( $title->isTalkPage() ) {
3222                         $other = $title->getSubjectPage();
3223                 } else {
3224                         $other = $title->getTalkPage();
3225                 }
3226                 $other->invalidateCache();
3227                 $other->purgeSquid();
3228
3229                 $title->touchLinks();
3230                 $title->purgeSquid();
3231
3232                 # File cache
3233                 if ( $wgUseFileCache ) {
3234                         $cm = new HTMLFileCache( $title );
3235                         @unlink( $cm->fileCacheName() );
3236                 }
3237
3238                 # Messages
3239                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
3240                         $wgMessageCache->replace( $title->getDBkey(), false );
3241                 }
3242                 # Images
3243                 if( $title->getNamespace() == NS_IMAGE ) {
3244                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3245                         $update->doUpdate();
3246                 }
3247                 # User talk pages
3248                 if( $title->getNamespace() == NS_USER_TALK ) {
3249                         $user = User::newFromName( $title->getText(), false );
3250                         $user->setNewtalk( false );
3251                 }
3252         }
3253
3254         /**
3255          * Purge caches on page update etc
3256          */
3257         public static function onArticleEdit( $title, $touchTemplates = true ) {
3258                 global $wgDeferredUpdateList, $wgUseFileCache;
3259
3260                 // Invalidate caches of articles which include this page
3261                 if( $touchTemplates )
3262                         $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3263
3264                 // Invalidate the caches of all pages which redirect here
3265                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3266
3267                 # Purge squid for this page only
3268                 $title->purgeSquid();
3269
3270                 # Clear file cache for this page only
3271                 if ( $wgUseFileCache ) {
3272                         $cm = new HTMLFileCache( $title );
3273                         @unlink( $cm->fileCacheName() );
3274                 }
3275         }
3276
3277         /**#@-*/
3278
3279         /**
3280          * Overriden by ImagePage class, only present here to avoid a fatal error
3281          * Called for ?action=revert
3282          */
3283         public function revert(){
3284                 global $wgOut;
3285                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3286         }
3287
3288         /**
3289          * Info about this page
3290          * Called for ?action=info when $wgAllowPageInfo is on.
3291          *
3292          * @public
3293          */
3294         function info() {
3295                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3296
3297                 if ( !$wgAllowPageInfo ) {
3298                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3299                         return;
3300                 }
3301
3302                 $page = $this->mTitle->getSubjectPage();
3303
3304                 $wgOut->setPagetitle( $page->getPrefixedText() );
3305                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3306                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ) );
3307
3308                 if( !$this->mTitle->exists() ) {
3309                         $wgOut->addHtml( '<div class="noarticletext">' );
3310                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3311                                 // This doesn't quite make sense; the user is asking for
3312                                 // information about the _page_, not the message... -- RC
3313                                 $wgOut->addHtml( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3314                         } else {
3315                                 $msg = $wgUser->isLoggedIn()
3316                                         ? 'noarticletext'
3317                                         : 'noarticletextanon';
3318                                 $wgOut->addHtml( wfMsgExt( $msg, 'parse' ) );
3319                         }
3320                         $wgOut->addHtml( '</div>' );
3321                 } else {
3322                         $dbr = wfGetDB( DB_SLAVE );
3323                         $wl_clause = array(
3324                                 'wl_title'     => $page->getDBkey(),
3325                                 'wl_namespace' => $page->getNamespace() );
3326                         $numwatchers = $dbr->selectField(
3327                                 'watchlist',
3328                                 'COUNT(*)',
3329                                 $wl_clause,
3330                                 __METHOD__,
3331                                 $this->getSelectOptions() );
3332
3333                         $pageInfo = $this->pageCountInfo( $page );
3334                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3335
3336                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3337                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3338                         if( $talkInfo ) {
3339                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3340                         }
3341                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3342                         if( $talkInfo ) {
3343                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3344                         }
3345                         $wgOut->addHTML( '</ul>' );
3346
3347                 }
3348         }
3349
3350         /**
3351          * Return the total number of edits and number of unique editors
3352          * on a given page. If page does not exist, returns false.
3353          *
3354          * @param Title $title
3355          * @return array
3356          * @private
3357          */
3358         function pageCountInfo( $title ) {
3359                 $id = $title->getArticleId();
3360                 if( $id == 0 ) {
3361                         return false;
3362                 }
3363
3364                 $dbr = wfGetDB( DB_SLAVE );
3365
3366                 $rev_clause = array( 'rev_page' => $id );
3367
3368                 $edits = $dbr->selectField(
3369                         'revision',
3370                         'COUNT(rev_page)',
3371                         $rev_clause,
3372                         __METHOD__,
3373                         $this->getSelectOptions() );
3374
3375                 $authors = $dbr->selectField(
3376                         'revision',
3377                         'COUNT(DISTINCT rev_user_text)',
3378                         $rev_clause,
3379                         __METHOD__,
3380                         $this->getSelectOptions() );
3381
3382                 return array( 'edits' => $edits, 'authors' => $authors );
3383         }
3384
3385         /**
3386          * Return a list of templates used by this article.
3387          * Uses the templatelinks table
3388          *
3389          * @return array Array of Title objects
3390          */
3391         public function getUsedTemplates() {
3392                 $result = array();
3393                 $id = $this->mTitle->getArticleID();
3394                 if( $id == 0 ) {
3395                         return array();
3396                 }
3397
3398                 $dbr = wfGetDB( DB_SLAVE );
3399                 $res = $dbr->select( array( 'templatelinks' ),
3400                         array( 'tl_namespace', 'tl_title' ),
3401                         array( 'tl_from' => $id ),
3402                         __METHOD__ );
3403                 if( false !== $res ) {
3404                         foreach( $res as $row ) {
3405                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3406                         }
3407                 }
3408                 $dbr->freeResult( $res );
3409                 return $result;
3410         }
3411
3412         /**
3413          * Returns a list of hidden categories this page is a member of.
3414          * Uses the page_props and categorylinks tables.
3415          *
3416          * @return array Array of Title objects
3417          */
3418         public function getHiddenCategories() {
3419                 $result = array();
3420                 $id = $this->mTitle->getArticleID();
3421                 if( $id == 0 ) {
3422                         return array();
3423                 }
3424
3425                 $dbr = wfGetDB( DB_SLAVE );
3426                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3427                         array( 'cl_to' ),
3428                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3429                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3430                         __METHOD__ );
3431                 if ( false !== $res ) {
3432                         foreach( $res as $row ) {
3433                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3434                         }
3435                 }
3436                 $dbr->freeResult( $res );
3437                 return $result;
3438         }
3439
3440         /**
3441         * Return an applicable autosummary if one exists for the given edit.
3442         * @param string $oldtext The previous text of the page.
3443         * @param string $newtext The submitted text of the page.
3444         * @param bitmask $flags A bitmask of flags submitted for the edit.
3445         * @return string An appropriate autosummary, or an empty string.
3446         */
3447         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3448                 # Decide what kind of autosummary is needed.
3449
3450                 # Redirect autosummaries
3451                 $rt = Title::newFromRedirect( $newtext );
3452                 if( is_object( $rt ) ) {
3453                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3454                 }
3455
3456                 # New page autosummaries
3457                 if( $flags & EDIT_NEW && strlen( $newtext ) ) {
3458                         # If they're making a new article, give its text, truncated, in the summary.
3459                         global $wgContLang;
3460                         $truncatedtext = $wgContLang->truncate(
3461                                 str_replace("\n", ' ', $newtext),
3462                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new') ) ),
3463                                 '...' );
3464                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3465                 }
3466
3467                 # Blanking autosummaries
3468                 if( $oldtext != '' && $newtext == '' ) {
3469                         return wfMsgForContent('autosumm-blank');
3470                 } elseif( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500) {
3471                         # Removing more than 90% of the article
3472                         global $wgContLang;
3473                         $truncatedtext = $wgContLang->truncate(
3474                                 $newtext,
3475                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ),
3476                                 '...'
3477                         );
3478                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3479                 }
3480
3481                 # If we reach this point, there's no applicable autosummary for our case, so our
3482                 # autosummary is empty.
3483                 return '';
3484         }
3485
3486         /**
3487          * Add the primary page-view wikitext to the output buffer
3488          * Saves the text into the parser cache if possible.
3489          * Updates templatelinks if it is out of date.
3490          *
3491          * @param string  $text
3492          * @param bool    $cache
3493          */
3494         public function outputWikiText( $text, $cache = true ) {
3495                 global $wgParser, $wgUser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
3496
3497                 $popts = $wgOut->parserOptions();
3498                 $popts->setTidy(true);
3499                 $popts->enableLimitReport();
3500                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3501                         $popts, true, true, $this->getRevIdFetched() );
3502                 $popts->setTidy(false);
3503                 $popts->enableLimitReport( false );
3504                 if ( $wgEnableParserCache && $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3505                         $parserCache = ParserCache::singleton();
3506                         $parserCache->save( $parserOutput, $this, $wgUser );
3507                 }
3508                 // Make sure file cache is not used on uncacheable content.
3509                 // Output that has magic words in it can still use the parser cache
3510                 // (if enabled), though it will generally expire sooner.
3511                 if( $parserOutput->getCacheTime() == -1 || $parserOutput->containsOldMagic() ) {
3512                         $wgUseFileCache = false;
3513                 }
3514
3515                 if ( !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3516                         // templatelinks table may have become out of sync,
3517                         // especially if using variable-based transclusions.
3518                         // For paranoia, check if things have changed and if
3519                         // so apply updates to the database. This will ensure
3520                         // that cascaded protections apply as soon as the changes
3521                         // are visible.
3522
3523                         # Get templates from templatelinks
3524                         $id = $this->mTitle->getArticleID();
3525
3526                         $tlTemplates = array();
3527
3528                         $dbr = wfGetDB( DB_SLAVE );
3529                         $res = $dbr->select( array( 'templatelinks' ),
3530                                 array( 'tl_namespace', 'tl_title' ),
3531                                 array( 'tl_from' => $id ),
3532                                 __METHOD__ );
3533
3534                         global $wgContLang;
3535
3536                         if ( false !== $res ) {
3537                                 foreach( $res as $row ) {
3538                                         $tlTemplates[] = $wgContLang->getNsText( $row->tl_namespace ) . ':' . $row->tl_title ;
3539                                 }
3540                         }
3541
3542                         # Get templates from parser output.
3543                         $poTemplates_allns = $parserOutput->getTemplates();
3544
3545                         $poTemplates = array ();
3546                         foreach ( $poTemplates_allns as $ns_templates ) {
3547                                 $poTemplates = array_merge( $poTemplates, $ns_templates );
3548                         }
3549
3550                         # Get the diff
3551                         $templates_diff = array_diff( $poTemplates, $tlTemplates );
3552
3553                         if ( count( $templates_diff ) > 0 ) {
3554                                 # Whee, link updates time.
3555                                 $u = new LinksUpdate( $this->mTitle, $parserOutput );
3556                                 $u->doUpdate();
3557                         }
3558                 }
3559
3560                 $wgOut->addParserOutput( $parserOutput );
3561         }
3562
3563         /**
3564          * Update all the appropriate counts in the category table, given that
3565          * we've added the categories $added and deleted the categories $deleted.
3566          *
3567          * @param $added array   The names of categories that were added
3568          * @param $deleted array The names of categories that were deleted
3569          * @return null
3570          */
3571         public function updateCategoryCounts( $added, $deleted ) {
3572                 $ns = $this->mTitle->getNamespace();
3573                 $dbw = wfGetDB( DB_MASTER );
3574
3575                 # First make sure the rows exist.  If one of the "deleted" ones didn't
3576                 # exist, we might legitimately not create it, but it's simpler to just
3577                 # create it and then give it a negative value, since the value is bogus
3578                 # anyway.
3579                 #
3580                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3581                 $insertCats = array_merge( $added, $deleted );
3582                 if( !$insertCats ) {
3583                         # Okay, nothing to do
3584                         return;
3585                 }
3586                 $insertRows = array();
3587                 foreach( $insertCats as $cat ) {
3588                         $insertRows[] = array( 'cat_title' => $cat );
3589                 }
3590                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3591
3592                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3593                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3594                 if( $ns == NS_CATEGORY ) {
3595                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3596                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3597                 } elseif( $ns == NS_IMAGE ) {
3598                         $addFields[]    = 'cat_files = cat_files + 1';
3599                         $removeFields[] = 'cat_files = cat_files - 1';
3600                 }
3601
3602                 if ( $added ) {
3603                         $dbw->update(
3604                                 'category',
3605                                 $addFields,
3606                                 array( 'cat_title' => $added ),
3607                                 __METHOD__
3608                         );
3609                 }
3610                 if ( $deleted ) {
3611                         $dbw->update(
3612                                 'category',
3613                                 $removeFields,
3614                                 array( 'cat_title' => $deleted ),
3615                                 __METHOD__
3616                         );
3617                 }
3618         }
3619 }