includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @package MediaWiki
   5  */
   6
   7 /**
   8  * Need the CacheManager to be loaded
   9  */
  10 require_once( 'CacheManager.php' );
  11
  12 $wgArticleCurContentFields = false;
  13 $wgArticleOldContentFields = false;
  14
  15 /**
  16  * Class representing a MediaWiki article and history.
  17  *
  18  * See design.txt for an overview.
  19  * Note: edit user interface and cache support functions have been
  20  * moved to separate EditPage and CacheManager classes.
  21  *
  22  * @package MediaWiki
  23  */
  24 class Article {
  25         /**@{{
  26          * @private
  27          */
  28         var $mComment;                  //!<
  29         var $mContent;                  //!<
  30         var $mContentLoaded;    //!<
  31         var $mCounter;                  //!<
  32         var $mFileCache;                //!<
  33         var $mForUpdate;                //!<
  34         var $mGoodAdjustment;   //!<
  35         var $mId;                               //!<
  36         var $mLatest;                   //!<
  37         var $mMinorEdit;                //!<
  38         var $mOldId;                    //!<
  39         var $mRedirectedFrom;   //!<
  40         var $mRedirectUrl;              //!<
  41         var $mRevIdFetched;             //!<
  42         var $mRevision;                 //!<
  43         var $mTable;                    //!<
  44         var $mTimestamp;                //!<
  45         var $mTitle;                    //!<
  46         var $mTotalAdjustment;  //!<
  47         var $mTouched;                  //!<
  48         var $mUser;                             //!<
  49         var $mUserText;                 //!<
  50         /**@}}*/
  51
  52         /**
  53          * Constructor and clear the article
  54          * @param $title Reference to a Title object.
  55          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  56          */
  57         function Article( &$title, $oldId = null ) {
  58                 $this->mTitle =& $title;
  59                 $this->mOldId = $oldId;
  60                 $this->clear();
  61         }
  62
  63         /**
  64          * Tell the page view functions that this view was redirected
  65          * from another page on the wiki.
  66          * @param $from Title object.
  67          */
  68         function setRedirectedFrom( $from ) {
  69                 $this->mRedirectedFrom = $from;
  70         }
  71
  72         /**
  73          * @return mixed false, Title of in-wiki target, or string with URL
  74          */
  75         function followRedirect() {
  76                 $text = $this->getContent();
  77                 $rt = Title::newFromRedirect( $text );
  78
  79                 # process if title object is valid and not special:userlogout
  80                 if( $rt ) {
  81                         if( $rt->getInterwiki() != '' ) {
  82                                 if( $rt->isLocal() ) {
  83                                         // Offsite wikis need an HTTP redirect.
  84                                         //
  85                                         // This can be hard to reverse and may produce loops,
  86                                         // so they may be disabled in the site configuration.
  87
  88                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
  89                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
  90                                 }
  91                         } else {
  92                                 if( $rt->getNamespace() == NS_SPECIAL ) {
  93                                         // Gotta hand redirects to special pages differently:
  94                                         // Fill the HTTP response "Location" header and ignore
  95                                         // the rest of the page we're on.
  96                                         //
  97                                         // This can be hard to reverse, so they may be disabled.
  98
  99                                         if( $rt->getNamespace() == NS_SPECIAL && $rt->getText() == 'Userlogout' ) {
 100                                                 // rolleyes
 101                                         } else {
 102                                                 return $rt->getFullURL();
 103                                         }
 104                                 }
 105                                 return $rt;
 106                         }
 107                 }
 108
 109                 // No or invalid redirect
 110                 return false;
 111         }
 112
 113         /**
 114          * get the title object of the article
 115          */
 116         function getTitle() {
 117                 return $this->mTitle;
 118         }
 119
 120         /**
 121           * Clear the object
 122           * @private
 123           */
 124         function clear() {
 125                 $this->mDataLoaded    = false;
 126                 $this->mContentLoaded = false;
 127
 128                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 129                 $this->mRedirectedFrom = null; # Title object if set
 130                 $this->mUserText =
 131                 $this->mTimestamp = $this->mComment = $this->mFileCache = '';
 132                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 133                 $this->mTouched = '19700101000000';
 134                 $this->mForUpdate = false;
 135                 $this->mIsRedirect = false;
 136                 $this->mRevIdFetched = 0;
 137                 $this->mRedirectUrl = false;
 138                 $this->mLatest = false;
 139         }
 140
 141         /**
 142          * Note that getContent/loadContent do not follow redirects anymore.
 143          * If you need to fetch redirectable content easily, try
 144          * the shortcut in Article::followContent()
 145          * FIXME
 146          * @todo There are still side-effects in this!
 147          *        In general, you should use the Revision class, not Article,
 148          *        to fetch text for purposes other than page views.
 149          *
 150          * @return Return the text of this revision
 151         */
 152         function getContent() {
 153                 global $wgRequest, $wgUser, $wgOut;
 154
 155                 # Get variables from query string :P
 156                 $action = $wgRequest->getText( 'action', 'view' );
 157                 $section = $wgRequest->getText( 'section' );
 158                 $preload = $wgRequest->getText( 'preload' );
 159
 160                 $fname =  'Article::getContent';
 161                 wfProfileIn( $fname );
 162
 163                 if ( 0 == $this->getID() ) {
 164                         if ( 'edit' == $action ) {
 165                                 wfProfileOut( $fname );
 166
 167                                 # If requested, preload some text.
 168                                 $text=$this->getPreloadedText($preload);
 169
 170                                 # We used to put MediaWiki:Newarticletext here if
 171                                 # $text was empty at this point.
 172                                 # This is now shown above the edit box instead.
 173                                 return $text;
 174                         }
 175                         wfProfileOut( $fname );
 176                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 177
 178                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 179                                 $ret = wfMsgWeirdKey ( $this->mTitle->getText() ) ;
 180                         } else {
 181                                 $ret = wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' );
 182                         }
 183
 184                         return "<div class='noarticletext'>$ret</div>";
 185                 } else {
 186                         $this->loadContent();
 187                         if($action=='edit') {
 188                                 if($section!='') {
 189                                         if($section=='new') {
 190                                                 wfProfileOut( $fname );
 191                                                 $text=$this->getPreloadedText($preload);
 192                                                 return $text;
 193                                         }
 194
 195                                         # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
 196                                         # comments to be stripped as well)
 197                                         $rv=$this->getSection($this->mContent,$section);
 198                                         wfProfileOut( $fname );
 199                                         return $rv;
 200                                 }
 201                         }
 202                         wfProfileOut( $fname );
 203                         return $this->mContent;
 204                 }
 205         }
 206
 207         /**
 208          * Get the contents of a page from its title and remove includeonly tags
 209          *
 210          * @param $preload String: the title of the page.
 211          * @return string The contents of the page.
 212          */
 213         function getPreloadedText($preload) {
 214                 if ( $preload === '' )
 215                         return '';
 216                 else {
 217                         $preloadTitle = Title::newFromText( $preload );
 218                         if ( isset( $preloadTitle ) && $preloadTitle->userCanRead() ) {
 219                                 $rev=Revision::newFromTitle($preloadTitle);
 220                                 if ( is_object( $rev ) ) {
 221                                         $text = $rev->getText();
 222                                         // TODO FIXME: AAAAAAAAAAA, this shouldn't be implementing
 223                                         // its own mini-parser! -ævar
 224                                         $text = preg_replace( '~</?includeonly>~', '', $text );
 225                                         return $text;
 226                                 } else
 227                                         return '';
 228                         }
 229                 }
 230         }
 231
 232         /**
 233          * This function returns the text of a section, specified by a number ($section).
 234          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 235          * the first section before any such heading (section 0).
 236          *
 237          * If a section contains subsections, these are also returned.
 238          *
 239          * @param $text String: text to look in
 240          * @param $section Integer: section number
 241          * @return string text of the requested section
 242          */
 243         function getSection($text,$section) {
 244                 global $wgParser;
 245                 return $wgParser->getSection( $text, $section );
 246         }
 247
 248         /**
 249          * @return int The oldid of the article that is to be shown, 0 for the
 250          *             current revision
 251          */
 252         function getOldID() {
 253                 if ( is_null( $this->mOldId ) ) {
 254                         $this->mOldId = $this->getOldIDFromRequest();
 255                 }
 256                 return $this->mOldId;
 257         }
 258
 259         /**
 260          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 261          *
 262          * @return int The old id for the request
 263          */
 264         function getOldIDFromRequest() {
 265                 global $wgRequest;
 266                 $this->mRedirectUrl = false;
 267                 $oldid = $wgRequest->getVal( 'oldid' );
 268                 if ( isset( $oldid ) ) {
 269                         $oldid = intval( $oldid );
 270                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 271                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 272                                 if ( $nextid  ) {
 273                                         $oldid = $nextid;
 274                                 } else {
 275                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 276                                 }
 277                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 278                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 279                                 if ( $previd ) {
 280                                         $oldid = $previd;
 281                                 } else {
 282                                         # TODO
 283                                 }
 284                         }
 285                         # unused:
 286                         # $lastid = $oldid;
 287                 }
 288                 if ( !$oldid ) {
 289                         $oldid = 0;
 290                 }
 291                 return $oldid;
 292         }
 293
 294         /**
 295          * Load the revision (including text) into this object
 296          */
 297         function loadContent() {
 298                 if ( $this->mContentLoaded ) return;
 299
 300                 # Query variables :P
 301                 $oldid = $this->getOldID();
 302
 303                 # Pre-fill content with error message so that if something
 304                 # fails we'll have something telling us what we intended.
 305
 306                 $t = $this->mTitle->getPrefixedText();
 307
 308                 $this->mOldId = $oldid;
 309                 $this->fetchContent( $oldid );
 310         }
 311
 312
 313         /**
 314          * Fetch a page record with the given conditions
 315          * @param Database $dbr
 316          * @param array    $conditions
 317          * @private
 318          */
 319         function pageData( &$dbr, $conditions ) {
 320                 $fields = array(
 321                                 'page_id',
 322                                 'page_namespace',
 323                                 'page_title',
 324                                 'page_restrictions',
 325                                 'page_counter',
 326                                 'page_is_redirect',
 327                                 'page_is_new',
 328                                 'page_random',
 329                                 'page_touched',
 330                                 'page_latest',
 331                                 'page_len' ) ;
 332                 wfRunHooks( 'ArticlePageDataBefore', array( &$this , &$fields ) )       ;
 333                 $row = $dbr->selectRow( 'page',
 334                         $fields,
 335                         $conditions,
 336                         'Article::pageData' );
 337                 wfRunHooks( 'ArticlePageDataAfter', array( &$this , &$row ) )   ;
 338                 return $row ;
 339         }
 340
 341         /**
 342          * @param Database $dbr
 343          * @param Title $title
 344          */
 345         function pageDataFromTitle( &$dbr, $title ) {
 346                 return $this->pageData( $dbr, array(
 347                         'page_namespace' => $title->getNamespace(),
 348                         'page_title'     => $title->getDBkey() ) );
 349         }
 350
 351         /**
 352          * @param Database $dbr
 353          * @param int $id
 354          */
 355         function pageDataFromId( &$dbr, $id ) {
 356                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 357         }
 358
 359         /**
 360          * Set the general counter, title etc data loaded from
 361          * some source.
 362          *
 363          * @param object $data
 364          * @private
 365          */
 366         function loadPageData( $data = 'fromdb' ) {
 367                 if ( $data === 'fromdb' ) {
 368                         $dbr =& $this->getDB();
 369                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 370                 }
 371
 372                 $lc =& LinkCache::singleton();
 373                 if ( $data ) {
 374                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle );
 375
 376                         $this->mTitle->mArticleID = $data->page_id;
 377                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 378                         $this->mTitle->mRestrictionsLoaded = true;
 379
 380                         $this->mCounter     = $data->page_counter;
 381                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 382                         $this->mIsRedirect  = $data->page_is_redirect;
 383                         $this->mLatest      = $data->page_latest;
 384                 } else {
 385                         if ( is_object( $this->mTitle ) ) {
 386                                 $lc->addBadLinkObj( $this->mTitle );
 387                         }
 388                         $this->mTitle->mArticleID = 0;
 389                 }
 390
 391                 $this->mDataLoaded  = true;
 392         }
 393
 394         /**
 395          * Get text of an article from database
 396          * Does *NOT* follow redirects.
 397          * @param int $oldid 0 for whatever the latest revision is
 398          * @return string
 399          */
 400         function fetchContent( $oldid = 0 ) {
 401                 if ( $this->mContentLoaded ) {
 402                         return $this->mContent;
 403                 }
 404
 405                 $dbr =& $this->getDB();
 406                 $fname = 'Article::fetchContent';
 407
 408                 # Pre-fill content with error message so that if something
 409                 # fails we'll have something telling us what we intended.
 410                 $t = $this->mTitle->getPrefixedText();
 411                 if( $oldid ) {
 412                         $t .= ',oldid='.$oldid;
 413                 }
 414                 $this->mContent = wfMsg( 'missingarticle', $t ) ;
 415
 416                 if( $oldid ) {
 417                         $revision = Revision::newFromId( $oldid );
 418                         if( is_null( $revision ) ) {
 419                                 wfDebug( "$fname failed to retrieve specified revision, id $oldid\n" );
 420                                 return false;
 421                         }
 422                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 423                         if( !$data ) {
 424                                 wfDebug( "$fname failed to get page data linked to revision id $oldid\n" );
 425                                 return false;
 426                         }
 427                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 428                         $this->loadPageData( $data );
 429                 } else {
 430                         if( !$this->mDataLoaded ) {
 431                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 432                                 if( !$data ) {
 433                                         wfDebug( "$fname failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 434                                         return false;
 435                                 }
 436                                 $this->loadPageData( $data );
 437                         }
 438                         $revision = Revision::newFromId( $this->mLatest );
 439                         if( is_null( $revision ) ) {
 440                                 wfDebug( "$fname failed to retrieve current page, rev_id {$data->page_latest}\n" );
 441                                 return false;
 442                         }
 443                 }
 444
 445                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 446                 // We should instead work with the Revision object when we need it...
 447                 $this->mContent = $revision->userCan( Revision::MW_REV_DELETED_TEXT ) ? $revision->getRawText() : "";
 448                 //$this->mContent   = $revision->getText();
 449
 450                 $this->mUser      = $revision->getUser();
 451                 $this->mUserText  = $revision->getUserText();
 452                 $this->mComment   = $revision->getComment();
 453                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 454
 455                 $this->mRevIdFetched = $revision->getID();
 456                 $this->mContentLoaded = true;
 457                 $this->mRevision =& $revision;
 458
 459                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 460
 461                 return $this->mContent;
 462         }
 463
 464         /**
 465          * Read/write accessor to select FOR UPDATE
 466          *
 467          * @param $x Mixed: FIXME
 468          */
 469         function forUpdate( $x = NULL ) {
 470                 return wfSetVar( $this->mForUpdate, $x );
 471         }
 472
 473         /**
 474          * Get the database which should be used for reads
 475          *
 476          * @return Database
 477          */
 478         function &getDB() {
 479                 $ret =& wfGetDB( DB_MASTER );
 480                 return $ret;
 481         }
 482
 483         /**
 484          * Get options for all SELECT statements
 485          *
 486          * @param $options Array: an optional options array which'll be appended to
 487          *                       the default
 488          * @return Array: options
 489          */
 490         function getSelectOptions( $options = '' ) {
 491                 if ( $this->mForUpdate ) {
 492                         if ( is_array( $options ) ) {
 493                                 $options[] = 'FOR UPDATE';
 494                         } else {
 495                                 $options = 'FOR UPDATE';
 496                         }
 497                 }
 498                 return $options;
 499         }
 500
 501         /**
 502          * @return int Page ID
 503          */
 504         function getID() {
 505                 if( $this->mTitle ) {
 506                         return $this->mTitle->getArticleID();
 507                 } else {
 508                         return 0;
 509                 }
 510         }
 511
 512         /**
 513          * @return bool Whether or not the page exists in the database
 514          */
 515         function exists() {
 516                 return $this->getId() != 0;
 517         }
 518
 519         /**
 520          * @return int The view count for the page
 521          */
 522         function getCount() {
 523                 if ( -1 == $this->mCounter ) {
 524                         $id = $this->getID();
 525                         if ( $id == 0 ) {
 526                                 $this->mCounter = 0;
 527                         } else {
 528                                 $dbr =& wfGetDB( DB_SLAVE );
 529                                 $this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
 530                                         'Article::getCount', $this->getSelectOptions() );
 531                         }
 532                 }
 533                 return $this->mCounter;
 534         }
 535
 536         /**
 537          * Determine whether a page  would be suitable for being counted as an
 538          * article in the site_stats table based on the title & its content
 539          *
 540          * @param $text String: text to analyze
 541          * @return bool
 542          */
 543         function isCountable( $text ) {
 544                 global $wgUseCommaCount;
 545
 546                 $token = $wgUseCommaCount ? ',' : '[[';
 547                 return
 548                         $this->mTitle->getNamespace() == NS_MAIN
 549                         && ! $this->isRedirect( $text )
 550                         && in_string( $token, $text );
 551         }
 552
 553         /**
 554          * Tests if the article text represents a redirect
 555          *
 556          * @param $text String: FIXME
 557          * @return bool
 558          */
 559         function isRedirect( $text = false ) {
 560                 if ( $text === false ) {
 561                         $this->loadContent();
 562                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 563                 } else {
 564                         $titleObj = Title::newFromRedirect( $text );
 565                 }
 566                 return $titleObj !== NULL;
 567         }
 568
 569         /**
 570          * Returns true if the currently-referenced revision is the current edit
 571          * to this page (and it exists).
 572          * @return bool
 573          */
 574         function isCurrent() {
 575                 return $this->exists() &&
 576                         isset( $this->mRevision ) &&
 577                         $this->mRevision->isCurrent();
 578         }
 579
 580         /**
 581          * Loads everything except the text
 582          * This isn't necessary for all uses, so it's only done if needed.
 583          * @private
 584          */
 585         function loadLastEdit() {
 586                 if ( -1 != $this->mUser )
 587                         return;
 588
 589                 # New or non-existent articles have no user information
 590                 $id = $this->getID();
 591                 if ( 0 == $id ) return;
 592
 593                 $this->mLastRevision = Revision::loadFromPageId( $this->getDB(), $id );
 594                 if( !is_null( $this->mLastRevision ) ) {
 595                         $this->mUser      = $this->mLastRevision->getUser();
 596                         $this->mUserText  = $this->mLastRevision->getUserText();
 597                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 598                         $this->mComment   = $this->mLastRevision->getComment();
 599                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 600                         $this->mRevIdFetched = $this->mLastRevision->getID();
 601                 }
 602         }
 603
 604         function getTimestamp() {
 605                 // Check if the field has been filled by ParserCache::get()
 606                 if ( !$this->mTimestamp ) {
 607                         $this->loadLastEdit();
 608                 }
 609                 return wfTimestamp(TS_MW, $this->mTimestamp);
 610         }
 611
 612         function getUser() {
 613                 $this->loadLastEdit();
 614                 return $this->mUser;
 615         }
 616
 617         function getUserText() {
 618                 $this->loadLastEdit();
 619                 return $this->mUserText;
 620         }
 621
 622         function getComment() {
 623                 $this->loadLastEdit();
 624                 return $this->mComment;
 625         }
 626
 627         function getMinorEdit() {
 628                 $this->loadLastEdit();
 629                 return $this->mMinorEdit;
 630         }
 631
 632         function getRevIdFetched() {
 633                 $this->loadLastEdit();
 634                 return $this->mRevIdFetched;
 635         }
 636
 637         /**
 638          * @todo Document, fixme $offset never used.
 639          * @param $limit Integer: default 0.
 640          * @param $offset Integer: default 0.
 641          */
 642         function getContributors($limit = 0, $offset = 0) {
 643                 $fname = 'Article::getContributors';
 644
 645                 # XXX: this is expensive; cache this info somewhere.
 646
 647                 $title = $this->mTitle;
 648                 $contribs = array();
 649                 $dbr =& wfGetDB( DB_SLAVE );
 650                 $revTable = $dbr->tableName( 'revision' );
 651                 $userTable = $dbr->tableName( 'user' );
 652                 $encDBkey = $dbr->addQuotes( $title->getDBkey() );
 653                 $ns = $title->getNamespace();
 654                 $user = $this->getUser();
 655                 $pageId = $this->getId();
 656
 657                 $sql = "SELECT rev_user, rev_user_text, user_real_name, MAX(rev_timestamp) as timestamp
 658                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 659                         WHERE rev_page = $pageId
 660                         AND rev_user != $user
 661                         GROUP BY rev_user, rev_user_text, user_real_name
 662                         ORDER BY timestamp DESC";
 663
 664                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 665                 $sql .= ' '. $this->getSelectOptions();
 666
 667                 $res = $dbr->query($sql, $fname);
 668
 669                 while ( $line = $dbr->fetchObject( $res ) ) {
 670                         $contribs[] = array($line->rev_user, $line->rev_user_text, $line->user_real_name);
 671                 }
 672
 673                 $dbr->freeResult($res);
 674                 return $contribs;
 675         }
 676
 677         /**
 678          * This is the default action of the script: just view the page of
 679          * the given title.
 680         */
 681         function view() {
 682                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 683                 global $wgEnableParserCache, $wgStylePath, $wgUseRCPatrol, $wgParser;
 684                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies;
 685                 $sk = $wgUser->getSkin();
 686
 687                 $fname = 'Article::view';
 688                 wfProfileIn( $fname );
 689
 690                 $parserCache =& ParserCache::singleton();
 691                 $ns = $this->mTitle->getNamespace(); # shortcut
 692
 693                 # Get variables from query string
 694                 $oldid = $this->getOldID();
 695
 696                 # getOldID may want us to redirect somewhere else
 697                 if ( $this->mRedirectUrl ) {
 698                         $wgOut->redirect( $this->mRedirectUrl );
 699                         wfProfileOut( $fname );
 700                         return;
 701                 }
 702
 703                 $diff = $wgRequest->getVal( 'diff' );
 704                 $rcid = $wgRequest->getVal( 'rcid' );
 705                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 706
 707                 $wgOut->setArticleFlag( true );
 708                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 709                         $policy = $wgNamespaceRobotPolicies[$ns];
 710                 } else {
 711                         $policy = 'index,follow';
 712                 }
 713                 $wgOut->setRobotpolicy( $policy );
 714
 715                 # If we got diff and oldid in the query, we want to see a
 716                 # diff page instead of the article.
 717
 718                 if ( !is_null( $diff ) ) {
 719                         require_once( 'DifferenceEngine.php' );
 720                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 721
 722                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid );
 723                         // DifferenceEngine directly fetched the revision:
 724                         $this->mRevIdFetched = $de->mNewid;
 725                         $de->showDiffPage();
 726
 727                         if( $diff == 0 ) {
 728                                 # Run view updates for current revision only
 729                                 $this->viewUpdates();
 730                         }
 731                         wfProfileOut( $fname );
 732                         return;
 733                 }
 734
 735                 if ( empty( $oldid ) && $this->checkTouched() ) {
 736                         $wgOut->setETag($parserCache->getETag($this, $wgUser));
 737
 738                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 739                                 wfProfileOut( $fname );
 740                                 return;
 741                         } else if ( $this->tryFileCache() ) {
 742                                 # tell wgOut that output is taken care of
 743                                 $wgOut->disable();
 744                                 $this->viewUpdates();
 745                                 wfProfileOut( $fname );
 746                                 return;
 747                         }
 748                 }
 749                 # Should the parser cache be used?
 750                 $pcache = $wgEnableParserCache &&
 751                         intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
 752                         $this->exists() &&
 753                         empty( $oldid );
 754                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 755                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 756                         wfIncrStats( 'pcache_miss_stub' );
 757                 }
 758
 759                 $wasRedirected = false;
 760                 if ( isset( $this->mRedirectedFrom ) ) {
 761                         // This is an internally redirected page view.
 762                         // We'll need a backlink to the source page for navigation.
 763                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 764                                 $sk = $wgUser->getSkin();
 765                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 766                                 $s = wfMsg( 'redirectedfrom', $redir );
 767                                 $wgOut->setSubtitle( $s );
 768                                 $wasRedirected = true;
 769                         }
 770                 } elseif ( !empty( $rdfrom ) ) {
 771                         // This is an externally redirected view, from some other wiki.
 772                         // If it was reported from a trusted site, supply a backlink.
 773                         global $wgRedirectSources;
 774                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 775                                 $sk = $wgUser->getSkin();
 776                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 777                                 $s = wfMsg( 'redirectedfrom', $redir );
 778                                 $wgOut->setSubtitle( $s );
 779                                 $wasRedirected = true;
 780                         }
 781                 }
 782
 783                 $outputDone = false;
 784                 if ( $pcache ) {
 785                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 786                                 $outputDone = true;
 787                         }
 788                 }
 789                 if ( !$outputDone ) {
 790                         $text = $this->getContent();
 791                         if ( $text === false ) {
 792                                 # Failed to load, replace text with error message
 793                                 $t = $this->mTitle->getPrefixedText();
 794                                 if( $oldid ) {
 795                                         $t .= ',oldid='.$oldid;
 796                                         $text = wfMsg( 'missingarticle', $t );
 797                                 } else {
 798                                         $text = wfMsg( 'noarticletext', $t );
 799                                 }
 800                         }
 801
 802                         # Another whitelist check in case oldid is altering the title
 803                         if ( !$this->mTitle->userCanRead() ) {
 804                                 $wgOut->loginToUse();
 805                                 $wgOut->output();
 806                                 exit;
 807                         }
 808
 809                         # We're looking at an old revision
 810
 811                         if ( !empty( $oldid ) ) {
 812                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 813                                 if( is_null( $this->mRevision ) ) {
 814                                         // FIXME: This would be a nice place to load the 'no such page' text.
 815                                 } else {
 816                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 817                                         if( $this->mRevision->isDeleted( Revision::MW_REV_DELETED_TEXT ) ) {
 818                                                 if( !$this->mRevision->userCan( Revision::MW_REV_DELETED_TEXT ) ) {
 819                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-permission' ) );
 820                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 821                                                         return;
 822                                                 } else {
 823                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-view' ) );
 824                                                         // and we are allowed to see...
 825                                                 }
 826                                         }
 827                                 }
 828
 829                         }
 830                 }
 831                 if( !$outputDone ) {
 832                         /**
 833                          * @fixme: this hook doesn't work most of the time, as it doesn't
 834                          * trigger when the parser cache is used.
 835                          */
 836                         wfRunHooks( 'ArticleViewHeader', array( &$this ) ) ;
 837                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 838                         # wrap user css and user js in pre and don't parse
 839                         # XXX: use $this->mTitle->usCssJsSubpage() when php is fixed/ a workaround is found
 840                         if (
 841                                 $ns == NS_USER &&
 842                                 preg_match('/\\/[\\w]+\\.(css|js)$/', $this->mTitle->getDBkey())
 843                         ) {
 844                                 $wgOut->addWikiText( wfMsg('clearyourcache'));
 845                                 $wgOut->addHTML( '<pre>'.htmlspecialchars($this->mContent)."\n</pre>" );
 846                         } else if ( $rt = Title::newFromRedirect( $text ) ) {
 847                                 # Display redirect
 848                                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 849                                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 850                                 # Don't overwrite the subtitle if this was an old revision
 851                                 if( !$wasRedirected && $this->isCurrent() ) {
 852                                         $wgOut->setSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 853                                 }
 854                                 $targetUrl = $rt->escapeLocalURL();
 855                                 # fixme unused $titleText :
 856                                 $titleText = htmlspecialchars( $rt->getPrefixedText() );
 857                                 $link = $sk->makeLinkObj( $rt );
 858
 859                                 $wgOut->addHTML( '<img src="'.$imageUrl.'" alt="#REDIRECT" />' .
 860                                   '<span class="redirectText">'.$link.'</span>' );
 861
 862                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 863                                 $wgOut->addParserOutputNoText( $parseout );
 864                         } else if ( $pcache ) {
 865                                 # Display content and save to parser cache
 866                                 $wgOut->addPrimaryWikiText( $text, $this );
 867                         } else {
 868                                 # Display content, don't attempt to save to parser cache
 869
 870                                 # Don't show section-edit links on old revisions... this way lies madness.
 871                                 if( !$this->isCurrent() ) {
 872                                         $oldEditSectionSetting = $wgOut->mParserOptions->setEditSection( false );
 873                                 }
 874                                 # Display content and don't save to parser cache
 875                                 $wgOut->addPrimaryWikiText( $text, $this, false );
 876
 877                                 if( !$this->isCurrent() ) {
 878                                         $wgOut->mParserOptions->setEditSection( $oldEditSectionSetting );
 879                                 }
 880                         }
 881                 }
 882                 /* title may have been set from the cache */
 883                 $t = $wgOut->getPageTitle();
 884                 if( empty( $t ) ) {
 885                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 886                 }
 887
 888                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 889                 if( $ns == NS_USER_TALK &&
 890                         User::isIP( $this->mTitle->getText() ) ) {
 891                         $wgOut->addWikiText( wfMsg('anontalkpagetext') );
 892                 }
 893
 894                 # If we have been passed an &rcid= parameter, we want to give the user a
 895                 # chance to mark this new article as patrolled.
 896                 if ( $wgUseRCPatrol && !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) ) {
 897                         $wgOut->addHTML(
 898                                 "<div class='patrollink'>" .
 899                                         wfMsg ( 'markaspatrolledlink',
 900                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsg('markaspatrolledtext'), "action=markpatrolled&rcid=$rcid" )
 901                                         ) .
 902                                 '</div>'
 903                          );
 904                 }
 905
 906                 # Trackbacks
 907                 if ($wgUseTrackbacks)
 908                         $this->addTrackbacks();
 909
 910                 $this->viewUpdates();
 911                 wfProfileOut( $fname );
 912         }
 913
 914         function addTrackbacks() {
 915                 global $wgOut, $wgUser;
 916
 917                 $dbr =& wfGetDB(DB_SLAVE);
 918                 $tbs = $dbr->select(
 919                                 /* FROM   */ 'trackbacks',
 920                                 /* SELECT */ array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
 921                                 /* WHERE  */ array('tb_page' => $this->getID())
 922                 );
 923
 924                 if (!$dbr->numrows($tbs))
 925                         return;
 926
 927                 $tbtext = "";
 928                 while ($o = $dbr->fetchObject($tbs)) {
 929                         $rmvtxt = "";
 930                         if ($wgUser->isAllowed( 'trackback' )) {
 931                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid="
 932                                                 . $o->tb_id . "&token=" . $wgUser->editToken());
 933                                 $rmvtxt = wfMsg('trackbackremove', $delurl);
 934                         }
 935                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
 936                                         $o->tb_title,
 937                                         $o->tb_url,
 938                                         $o->tb_ex,
 939                                         $o->tb_name,
 940                                         $rmvtxt);
 941                 }
 942                 $wgOut->addWikitext(wfMsg('trackbackbox', $tbtext));
 943         }
 944
 945         function deletetrackback() {
 946                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
 947
 948                 if (!$wgUser->matchEditToken($wgRequest->getVal('token'))) {
 949                         $wgOut->addWikitext(wfMsg('sessionfailure'));
 950                         return;
 951                 }
 952
 953                 if ((!$wgUser->isAllowed('delete'))) {
 954                         $wgOut->sysopRequired();
 955                         return;
 956                 }
 957
 958                 if (wfReadOnly()) {
 959                         $wgOut->readOnlyPage();
 960                         return;
 961                 }
 962
 963                 $db =& wfGetDB(DB_MASTER);
 964                 $db->delete('trackbacks', array('tb_id' => $wgRequest->getInt('tbid')));
 965                 $wgTitle->invalidateCache();
 966                 $wgOut->addWikiText(wfMsg('trackbackdeleteok'));
 967         }
 968
 969         function render() {
 970                 global $wgOut;
 971
 972                 $wgOut->setArticleBodyOnly(true);
 973                 $this->view();
 974         }
 975
 976         /**
 977          * Handle action=purge
 978          */
 979         function purge() {
 980                 global $wgUser, $wgRequest, $wgOut;
 981
 982                 if ( $wgUser->isLoggedIn() || $wgRequest->wasPosted() ) {
 983                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
 984                                 $this->doPurge();
 985                         }
 986                 } else {
 987                         $msg = $wgOut->parse( wfMsg( 'confirm_purge' ) );
 988                         $action = $this->mTitle->escapeLocalURL( 'action=purge' );
 989                         $button = htmlspecialchars( wfMsg( 'confirm_purge_button' ) );
 990                         $msg = str_replace( '$1',
 991                                 "<form method=\"post\" action=\"$action\">\n" .
 992                                 "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
 993                                 "</form>\n", $msg );
 994
 995                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 996                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 997                         $wgOut->addHTML( $msg );
 998                 }
 999         }
1000
1001         /**
1002          * Perform the actions of a page purging
1003          */
1004         function doPurge() {
1005                 global $wgUseSquid;
1006                 // Invalidate the cache
1007                 $this->mTitle->invalidateCache();
1008
1009                 if ( $wgUseSquid ) {
1010                         // Commit the transaction before the purge is sent
1011                         $dbw = wfGetDB( DB_MASTER );
1012                         $dbw->immediateCommit();
1013
1014                         // Send purge
1015                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1016                         $update->doUpdate();
1017                 }
1018                 $this->view();
1019         }
1020
1021         /**
1022          * Insert a new empty page record for this article.
1023          * This *must* be followed up by creating a revision
1024          * and running $this->updateToLatest( $rev_id );
1025          * or else the record will be left in a funky state.
1026          * Best if all done inside a transaction.
1027          *
1028          * @param Database $dbw
1029          * @param string   $restrictions
1030          * @return int     The newly created page_id key
1031          * @private
1032          */
1033         function insertOn( &$dbw, $restrictions = '' ) {
1034                 $fname = 'Article::insertOn';
1035                 wfProfileIn( $fname );
1036
1037                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1038                 $dbw->insert( 'page', array(
1039                         'page_id'           => $page_id,
1040                         'page_namespace'    => $this->mTitle->getNamespace(),
1041                         'page_title'        => $this->mTitle->getDBkey(),
1042                         'page_counter'      => 0,
1043                         'page_restrictions' => $restrictions,
1044                         'page_is_redirect'  => 0, # Will set this shortly...
1045                         'page_is_new'       => 1,
1046                         'page_random'       => wfRandom(),
1047                         'page_touched'      => $dbw->timestamp(),
1048                         'page_latest'       => 0, # Fill this in shortly...
1049                         'page_len'          => 0, # Fill this in shortly...
1050                 ), $fname );
1051                 $newid = $dbw->insertId();
1052
1053                 $this->mTitle->resetArticleId( $newid );
1054
1055                 wfProfileOut( $fname );
1056                 return $newid;
1057         }
1058
1059         /**
1060          * Update the page record to point to a newly saved revision.
1061          *
1062          * @param Database $dbw
1063          * @param Revision $revision For ID number, and text used to set
1064                                      length and redirect status fields
1065          * @param int $lastRevision If given, will not overwrite the page field
1066          *                          when different from the currently set value.
1067          *                          Giving 0 indicates the new page flag should
1068          *                          be set on.
1069          * @return bool true on success, false on failure
1070          * @private
1071          */
1072         function updateRevisionOn( &$dbw, $revision, $lastRevision = null ) {
1073                 $fname = 'Article::updateToRevision';
1074                 wfProfileIn( $fname );
1075
1076                 $conditions = array( 'page_id' => $this->getId() );
1077                 if( !is_null( $lastRevision ) ) {
1078                         # An extra check against threads stepping on each other
1079                         $conditions['page_latest'] = $lastRevision;
1080                 }
1081
1082                 $text = $revision->getText();
1083                 $dbw->update( 'page',
1084                         array( /* SET */
1085                                 'page_latest'      => $revision->getId(),
1086                                 'page_touched'     => $dbw->timestamp(),
1087                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1088                                 'page_is_redirect' => Article::isRedirect( $text ) ? 1 : 0,
1089                                 'page_len'         => strlen( $text ),
1090                         ),
1091                         $conditions,
1092                         $fname );
1093
1094                 wfProfileOut( $fname );
1095                 return ( $dbw->affectedRows() != 0 );
1096         }
1097
1098         /**
1099          * If the given revision is newer than the currently set page_latest,
1100          * update the page record. Otherwise, do nothing.
1101          *
1102          * @param Database $dbw
1103          * @param Revision $revision
1104          */
1105         function updateIfNewerOn( &$dbw, $revision ) {
1106                 $fname = 'Article::updateIfNewerOn';
1107                 wfProfileIn( $fname );
1108
1109                 $row = $dbw->selectRow(
1110                         array( 'revision', 'page' ),
1111                         array( 'rev_id', 'rev_timestamp' ),
1112                         array(
1113                                 'page_id' => $this->getId(),
1114                                 'page_latest=rev_id' ),
1115                         $fname );
1116                 if( $row ) {
1117                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1118                                 wfProfileOut( $fname );
1119                                 return false;
1120                         }
1121                         $prev = $row->rev_id;
1122                 } else {
1123                         # No or missing previous revision; mark the page as new
1124                         $prev = 0;
1125                 }
1126
1127                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev );
1128                 wfProfileOut( $fname );
1129                 return $ret;
1130         }
1131
1132         /**
1133          * Insert a new article into the database
1134          * @private
1135          */
1136         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false ) {
1137                 global $wgUser;
1138
1139                 $fname = 'Article::insertNewArticle';
1140                 wfProfileIn( $fname );
1141
1142                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1143                         &$summary, &$isminor, &$watchthis, NULL ) ) ) {
1144                         wfDebug( "$fname: ArticleSave hook aborted save!\n" );
1145                         wfProfileOut( $fname );
1146                         return false;
1147                 }
1148
1149                 $ns = $this->mTitle->getNamespace();
1150                 $ttl = $this->mTitle->getDBkey();
1151
1152                 # If this is a comment, add the summary as headline
1153                 if($comment && $summary!="") {
1154                         $text="== {$summary} ==\n\n".$text;
1155                 }
1156                 $text = $this->preSaveTransform( $text );
1157
1158
1159                 # Set statistics members
1160                 # We work out if it's countable after PST to avoid counter drift
1161                 # when articles are created with {{subst:}}
1162                 $this->mGoodAdjustment = (int)$this->isCountable( $text );
1163                 $this->mTotalAdjustment = 1;
1164
1165                 /* Silently ignore minoredit if not allowed */
1166                 $isminor = $isminor && $wgUser->isAllowed('minoredit');
1167                 $now = wfTimestampNow();
1168
1169                 $dbw =& wfGetDB( DB_MASTER );
1170
1171                 # Add the page record; stake our claim on this title!
1172                 $newid = $this->insertOn( $dbw );
1173
1174                 # Save the revision text...
1175                 $revision = new Revision( array(
1176                         'page'       => $newid,
1177                         'comment'    => $summary,
1178                         'minor_edit' => $isminor,
1179                         'text'       => $text
1180                         ) );
1181                 $revisionId = $revision->insertOn( $dbw );
1182
1183                 $this->mTitle->resetArticleID( $newid );
1184
1185                 # Update the page record with revision data
1186                 $this->updateRevisionOn( $dbw, $revision, 0 );
1187
1188                 Article::onArticleCreate( $this->mTitle );
1189                 if(!$suppressRC) {
1190                         require_once( 'RecentChange.php' );
1191                         $rcid = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary, 'default',
1192                           '', strlen( $text ), $revisionId );
1193                         # Mark as patrolled if the user can and has the option set
1194                         if( $wgUser->isAllowed( 'patrol' ) && $wgUser->getOption( 'autopatrol' ) ) {
1195                                 RecentChange::markPatrolled( $rcid );
1196                         }
1197                 }
1198
1199                 if ($watchthis) {
1200                         if(!$this->mTitle->userIsWatching()) $this->doWatch();
1201                 } else {
1202                         if ( $this->mTitle->userIsWatching() ) {
1203                                 $this->doUnwatch();
1204                         }
1205                 }
1206
1207                 # The talk page isn't in the regular link tables, so we need to update manually:
1208                 $talkns = $ns ^ 1; # talk -> normal; normal -> talk
1209                 $dbw->update( 'page',
1210                         array( 'page_touched' => $dbw->timestamp($now) ),
1211                         array( 'page_namespace' => $talkns,
1212                                'page_title' => $ttl ),
1213                         $fname );
1214
1215                 # standard deferred updates
1216                 $this->editUpdates( $text, $summary, $isminor, $now, $revisionId );
1217
1218                 $oldid = 0; # new article
1219                 $this->showArticle( $text, wfMsg( 'newarticle' ), false, $isminor, $now, $summary, $oldid );
1220
1221                 wfRunHooks( 'ArticleInsertComplete', array( &$this, &$wgUser, $text,
1222                         $summary, $isminor,
1223                         $watchthis, NULL ) );
1224                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$wgUser, $text,
1225                         $summary, $isminor,
1226                         $watchthis, NULL ) );
1227                 wfProfileOut( $fname );
1228         }
1229
1230         /**
1231          * @return string Complete article text, or null if error
1232          */
1233         function replaceSection($section, $text, $summary = '', $edittime = NULL) {
1234                 $fname = 'Article::replaceSection';
1235                 wfProfileIn( $fname );
1236
1237                 if( $section == '' ) {
1238                         // Whole-page edit; let the text through unmolested.
1239                 } else {
1240                         if( is_null( $edittime ) ) {
1241                                 $rev = Revision::newFromTitle( $this->mTitle );
1242                         } else {
1243                                 $dbw =& wfGetDB( DB_MASTER );
1244                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1245                         }
1246                         if( is_null( $rev ) ) {
1247                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1248                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1249                                 return null;
1250                         }
1251                         $oldtext = $rev->getText();
1252
1253                         if($section=='new') {
1254                                 if($summary) $subject="== {$summary} ==\n\n";
1255                                 $text=$oldtext."\n\n".$subject.$text;
1256                         } else {
1257                                 global $wgParser;
1258                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1259                         }
1260                 }
1261
1262                 wfProfileOut( $fname );
1263                 return $text;
1264         }
1265
1266         /**
1267          * Change an existing article. Puts the previous version back into the old table, updates RC
1268          * and all necessary caches, mostly via the deferred update array.
1269          *
1270          * It is possible to call this function from a command-line script, but note that you should
1271          * first set $wgUser, and clean up $wgDeferredUpdates after each edit.
1272          */
1273         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1274                 global $wgUser, $wgDBtransactions, $wgUseSquid;
1275                 global $wgPostCommitUpdateList, $wgUseFileCache;
1276
1277                 $fname = 'Article::updateArticle';
1278                 wfProfileIn( $fname );
1279                 $good = true;
1280
1281                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1282                         &$summary, &$minor,
1283                         &$watchthis, &$sectionanchor ) ) ) {
1284                         wfDebug( "$fname: ArticleSave hook aborted save!\n" );
1285                         wfProfileOut( $fname );
1286                         return false;
1287                 }
1288
1289                 $isminor = $minor && $wgUser->isAllowed('minoredit');
1290
1291                 $text = $this->preSaveTransform( $text );
1292                 $dbw =& wfGetDB( DB_MASTER );
1293                 $now = wfTimestampNow();
1294
1295                 # Update article, but only if changed.
1296
1297                 # It's important that we either rollback or complete, otherwise an attacker could
1298                 # overwrite cur entries by sending precisely timed user aborts. Random bored users
1299                 # could conceivably have the same effect, especially if cur is locked for long periods.
1300                 if( !$wgDBtransactions ) {
1301                         $userAbort = ignore_user_abort( true );
1302                 }
1303
1304                 $oldtext = $this->getContent();
1305                 $oldsize = strlen( $oldtext );
1306                 $newsize = strlen( $text );
1307                 $lastRevision = 0;
1308                 $revisionId = 0;
1309
1310                 if ( 0 != strcmp( $text, $oldtext ) ) {
1311                         $this->mGoodAdjustment = (int)$this->isCountable( $text )
1312                           - (int)$this->isCountable( $oldtext );
1313                         $this->mTotalAdjustment = 0;
1314                         $now = wfTimestampNow();
1315
1316                         $lastRevision = $dbw->selectField(
1317                                 'page', 'page_latest', array( 'page_id' => $this->getId() ) );
1318
1319                         $revision = new Revision( array(
1320                                 'page'       => $this->getId(),
1321                                 'comment'    => $summary,
1322                                 'minor_edit' => $isminor,
1323                                 'text'       => $text
1324                                 ) );
1325
1326                         $dbw->immediateCommit();
1327                         $dbw->begin();
1328                         $revisionId = $revision->insertOn( $dbw );
1329
1330                         # Update page
1331                         $ok = $this->updateRevisionOn( $dbw, $revision, $lastRevision );
1332
1333                         if( !$ok ) {
1334                                 /* Belated edit conflict! Run away!! */
1335                                 $good = false;
1336                                 $dbw->rollback();
1337                         } else {
1338                                 # Update recentchanges and purge cache and whatnot
1339                                 require_once( 'RecentChange.php' );
1340                                 $bot = (int)($wgUser->isBot() || $forceBot);
1341                                 $rcid = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $wgUser, $summary,
1342                                         $lastRevision, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1343                                         $revisionId );
1344
1345                                 # Mark as patrolled if the user can do so and has it set in their options
1346                                 if( $wgUser->isAllowed( 'patrol' ) && $wgUser->getOption( 'autopatrol' ) ) {
1347                                         RecentChange::markPatrolled( $rcid );
1348                                 }
1349
1350                                 $dbw->commit();
1351
1352                                 // Update caches outside the main transaction
1353                                 Article::onArticleEdit( $this->mTitle );
1354                         }
1355                 } else {
1356                         // Keep the same revision ID, but do some updates on it
1357                         $revisionId = $this->getRevIdFetched();
1358                 }
1359
1360                 if( !$wgDBtransactions ) {
1361                         ignore_user_abort( $userAbort );
1362                 }
1363
1364                 if ( $good ) {
1365                         if ($watchthis) {
1366                                 if (!$this->mTitle->userIsWatching()) {
1367                                         $dbw->immediateCommit();
1368                                         $dbw->begin();
1369                                         $this->doWatch();
1370                                         $dbw->commit();
1371                                 }
1372                         } else {
1373                                 if ( $this->mTitle->userIsWatching() ) {
1374                                         $dbw->immediateCommit();
1375                                         $dbw->begin();
1376                                         $this->doUnwatch();
1377                                         $dbw->commit();
1378                                 }
1379                         }
1380                         # standard deferred updates
1381                         $this->editUpdates( $text, $summary, $minor, $now, $revisionId );
1382
1383
1384                         $urls = array();
1385                         # Invalidate caches of all articles using this article as a template
1386
1387                         # Template namespace
1388                         # Purge all articles linking here
1389                         $titles = $this->mTitle->getTemplateLinksTo();
1390                         Title::touchArray( $titles );
1391                         if ( $wgUseSquid ) {
1392                                         foreach ( $titles as $title ) {
1393                                                 $urls[] = $title->getInternalURL();
1394                                         }
1395                         }
1396
1397                         # Squid updates
1398                         if ( $wgUseSquid ) {
1399                                 $urls = array_merge( $urls, $this->mTitle->getSquidURLs() );
1400                                 $u = new SquidUpdate( $urls );
1401                                 array_push( $wgPostCommitUpdateList, $u );
1402                         }
1403
1404                         # File cache
1405                         if ( $wgUseFileCache ) {
1406                                 $cm = new CacheManager($this->mTitle);
1407                                 @unlink($cm->fileCacheName());
1408                         }
1409
1410                         $this->showArticle( $text, wfMsg( 'updated' ), $sectionanchor, $isminor, $now, $summary, $lastRevision );
1411                 }
1412                 wfRunHooks( 'ArticleSaveComplete',
1413                         array( &$this, &$wgUser, $text,
1414                         $summary, $minor,
1415                         $watchthis, $sectionanchor ) );
1416                 wfProfileOut( $fname );
1417                 return $good;
1418         }
1419
1420         /**
1421          * After we've either updated or inserted the article, update
1422          * the link tables and redirect to the new page.
1423          * @todo FIXME some function arguments never used
1424          */
1425         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1426                 global $wgOut;
1427
1428                 $fname = 'Article::showArticle';
1429                 wfProfileIn( $fname );
1430
1431                 # Output the redirect
1432                 if( $this->isRedirect( $text ) )
1433                         $r = 'redirect=no';
1434                 else
1435                         $r = '';
1436                 $wgOut->redirect( $this->mTitle->getFullURL( $r ).$sectionanchor );
1437
1438                 wfProfileOut( $fname );
1439         }
1440
1441         /**
1442          * Mark this particular edit as patrolled
1443          */
1444         function markpatrolled() {
1445                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUser;
1446                 $wgOut->setRobotpolicy( 'noindex,follow' );
1447
1448                 # Check RC patrol config. option
1449                 if( !$wgUseRCPatrol ) {
1450                         $wgOut->errorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1451                         return;
1452                 }
1453
1454                 # Check permissions
1455                 if( !$wgUser->isAllowed( 'patrol' ) ) {
1456                         $wgOut->permissionRequired( 'patrol' );
1457                         return;
1458                 }
1459
1460                 $rcid = $wgRequest->getVal( 'rcid' );
1461                 if ( !is_null ( $rcid ) ) {
1462                         if( wfRunHooks( 'MarkPatrolled', array( &$rcid, &$wgUser, false ) ) ) {
1463                                 require_once( 'RecentChange.php' );
1464                                 RecentChange::markPatrolled( $rcid );
1465                                 wfRunHooks( 'MarkPatrolledComplete', array( &$rcid, &$wgUser, false ) );
1466                                 $wgOut->setPagetitle( wfMsg( 'markedaspatrolled' ) );
1467                                 $wgOut->addWikiText( wfMsg( 'markedaspatrolledtext' ) );
1468                         }
1469                         $rcTitle = Title::makeTitle( NS_SPECIAL, 'Recentchanges' );
1470                         $wgOut->returnToMain( false, $rcTitle->getPrefixedText() );
1471                 }
1472                 else {
1473                         $wgOut->errorpage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1474                 }
1475         }
1476
1477         /**
1478          * User-interface handler for the "watch" action
1479          */
1480
1481         function watch() {
1482
1483                 global $wgUser, $wgOut;
1484
1485                 if ( $wgUser->isAnon() ) {
1486                         $wgOut->errorpage( 'watchnologin', 'watchnologintext' );
1487                         return;
1488                 }
1489                 if ( wfReadOnly() ) {
1490                         $wgOut->readOnlyPage();
1491                         return;
1492                 }
1493
1494                 if( $this->doWatch() ) {
1495                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1496                         $wgOut->setRobotpolicy( 'noindex,follow' );
1497
1498                         $link = $this->mTitle->getPrefixedText();
1499                         $text = wfMsg( 'addedwatchtext', $link );
1500                         $wgOut->addWikiText( $text );
1501                 }
1502
1503                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1504         }
1505
1506         /**
1507          * Add this page to $wgUser's watchlist
1508          * @return bool true on successful watch operation
1509          */
1510         function doWatch() {
1511                 global $wgUser;
1512                 if( $wgUser->isAnon() ) {
1513                         return false;
1514                 }
1515
1516                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1517                         $wgUser->addWatch( $this->mTitle );
1518                         $wgUser->saveSettings();
1519
1520                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1521                 }
1522
1523                 return false;
1524         }
1525
1526         /**
1527          * User interface handler for the "unwatch" action.
1528          */
1529         function unwatch() {
1530
1531                 global $wgUser, $wgOut;
1532
1533                 if ( $wgUser->isAnon() ) {
1534                         $wgOut->errorpage( 'watchnologin', 'watchnologintext' );
1535                         return;
1536                 }
1537                 if ( wfReadOnly() ) {
1538                         $wgOut->readOnlyPage();
1539                         return;
1540                 }
1541
1542                 if( $this->doUnwatch() ) {
1543                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1544                         $wgOut->setRobotpolicy( 'noindex,follow' );
1545
1546                         $link = $this->mTitle->getPrefixedText();
1547                         $text = wfMsg( 'removedwatchtext', $link );
1548                         $wgOut->addWikiText( $text );
1549                 }
1550
1551                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1552         }
1553
1554         /**
1555          * Stop watching a page
1556          * @return bool true on successful unwatch
1557          */
1558         function doUnwatch() {
1559                 global $wgUser;
1560                 if( $wgUser->isAnon() ) {
1561                         return false;
1562                 }
1563
1564                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1565                         $wgUser->removeWatch( $this->mTitle );
1566                         $wgUser->saveSettings();
1567
1568                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1569                 }
1570
1571                 return false;
1572         }
1573
1574         /**
1575          * action=protect handler
1576          */
1577         function protect() {
1578                 require_once 'ProtectionForm.php';
1579                 $form = new ProtectionForm( $this );
1580                 $form->show();
1581         }
1582
1583         /**
1584          * action=unprotect handler (alias)
1585          */
1586         function unprotect() {
1587                 $this->protect();
1588         }
1589
1590         /**
1591          * Update the article's restriction field, and leave a log entry.
1592          *
1593          * @param array $limit set of restriction keys
1594          * @param string $reason
1595          * @return bool true on success
1596          */
1597         function updateRestrictions( $limit = array(), $reason = '' ) {
1598                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1599
1600                 $id = $this->mTitle->getArticleID();
1601                 if( !$wgUser->isAllowed( 'protect' ) || wfReadOnly() || $id == 0 ) {
1602                         return false;
1603                 }
1604
1605                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1606                 # we expect a single selection, but the schema allows otherwise.
1607                 $current = array();
1608                 foreach( $wgRestrictionTypes as $action )
1609                         $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1610
1611                 $current = Article::flattenRestrictions( $current );
1612                 $updated = Article::flattenRestrictions( $limit );
1613
1614                 $changed = ( $current != $updated );
1615                 $protect = ( $updated != '' );
1616
1617                 # If nothing's changed, do nothing
1618                 if( $changed ) {
1619                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1620
1621                                 $dbw =& wfGetDB( DB_MASTER );
1622
1623                                 # Prepare a null revision to be added to the history
1624                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $protect ? 'protectedarticle' : 'unprotectedarticle', $this->mTitle->getPrefixedText() ) );
1625                                 if( $reason )
1626                                         $comment .= ": $reason";
1627                                 if( $protect )
1628                                         $comment .= " [$updated]";
1629                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $comment, true );
1630                                 $nullRevId = $nullRevision->insertOn( $dbw );
1631
1632                                 # Update page record
1633                                 $dbw->update( 'page',
1634                                         array( /* SET */
1635                                                 'page_touched' => $dbw->timestamp(),
1636                                                 'page_restrictions' => $updated,
1637                                                 'page_latest' => $nullRevId
1638                                         ), array( /* WHERE */
1639                                                 'page_id' => $id
1640                                         ), 'Article::protect'
1641                                 );
1642                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1643
1644                                 # Update the protection log
1645                                 $log = new LogPage( 'protect' );
1646                                 if( $protect ) {
1647                                         $log->addEntry( 'protect', $this->mTitle, trim( $reason . " [$updated]" ) );
1648                                 } else {
1649                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1650                                 }
1651
1652                         } # End hook
1653                 } # End "changed" check
1654
1655                 return true;
1656         }
1657
1658         /**
1659          * Take an array of page restrictions and flatten it to a string
1660          * suitable for insertion into the page_restrictions field.
1661          * @param array $limit
1662          * @return string
1663          * @private
1664          */
1665         function flattenRestrictions( $limit ) {
1666                 if( !is_array( $limit ) ) {
1667                         wfDebugDieBacktrace( 'Article::flattenRestrictions given non-array restriction set' );
1668                 }
1669                 $bits = array();
1670                 ksort( $limit );
1671                 foreach( $limit as $action => $restrictions ) {
1672                         if( $restrictions != '' ) {
1673                                 $bits[] = "$action=$restrictions";
1674                         }
1675                 }
1676                 return implode( ':', $bits );
1677         }
1678
1679         /*
1680          * UI entry point for page deletion
1681          */
1682         function delete() {
1683                 global $wgUser, $wgOut, $wgRequest;
1684                 $fname = 'Article::delete';
1685                 $confirm = $wgRequest->wasPosted() &&
1686                         $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1687                 $reason = $wgRequest->getText( 'wpReason' );
1688
1689                 # This code desperately needs to be totally rewritten
1690
1691                 # Check permissions
1692                 if( $wgUser->isAllowed( 'delete' ) ) {
1693                         if( $wgUser->isBlocked() ) {
1694                                 $wgOut->blockedPage();
1695                                 return;
1696                         }
1697                 } else {
1698                         $wgOut->permissionRequired( 'delete' );
1699                         return;
1700                 }
1701
1702                 if( wfReadOnly() ) {
1703                         $wgOut->readOnlyPage();
1704                         return;
1705                 }
1706
1707                 $wgOut->setPagetitle( wfMsg( 'confirmdelete' ) );
1708
1709                 # Better double-check that it hasn't been deleted yet!
1710                 $dbw =& wfGetDB( DB_MASTER );
1711                 $conds = $this->mTitle->pageCond();
1712                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, $fname );
1713                 if ( $latest === false ) {
1714                         $wgOut->fatalError( wfMsg( 'cannotdelete' ) );
1715                         return;
1716                 }
1717
1718                 if( $confirm ) {
1719                         $this->doDelete( $reason );
1720                         return;
1721                 }
1722
1723                 # determine whether this page has earlier revisions
1724                 # and insert a warning if it does
1725                 $maxRevisions = 20;
1726                 $authors = $this->getLastNAuthors( $maxRevisions, $latest );
1727
1728                 if( count( $authors ) > 1 && !$confirm ) {
1729                         $skin=$wgUser->getSkin();
1730                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
1731                 }
1732
1733                 # If a single user is responsible for all revisions, find out who they are
1734                 if ( count( $authors ) == $maxRevisions ) {
1735                         // Query bailed out, too many revisions to find out if they're all the same
1736                         $authorOfAll = false;
1737                 } else {
1738                         $authorOfAll = reset( $authors );
1739                         foreach ( $authors as $author ) {
1740                                 if ( $authorOfAll != $author ) {
1741                                         $authorOfAll = false;
1742                                         break;
1743                                 }
1744                         }
1745                 }
1746                 # Fetch article text
1747                 $rev = Revision::newFromTitle( $this->mTitle );
1748
1749                 if( !is_null( $rev ) ) {
1750                         # if this is a mini-text, we can paste part of it into the deletion reason
1751                         $text = $rev->getText();
1752
1753                         #if this is empty, an earlier revision may contain "useful" text
1754                         $blanked = false;
1755                         if( $text == '' ) {
1756                                 $prev = $rev->getPrevious();
1757                                 if( $prev ) {
1758                                         $text = $prev->getText();
1759                                         $blanked = true;
1760                                 }
1761                         }
1762
1763                         $length = strlen( $text );
1764
1765                         # this should not happen, since it is not possible to store an empty, new
1766                         # page. Let's insert a standard text in case it does, though
1767                         if( $length == 0 && $reason === '' ) {
1768                                 $reason = wfMsgForContent( 'exblank' );
1769                         }
1770
1771                         if( $length < 500 && $reason === '' ) {
1772                                 # comment field=255, let's grep the first 150 to have some user
1773                                 # space left
1774                                 global $wgContLang;
1775                                 $text = $wgContLang->truncate( $text, 150, '...' );
1776
1777                                 # let's strip out newlines
1778                                 $text = preg_replace( "/[\n\r]/", '', $text );
1779
1780                                 if( !$blanked ) {
1781                                         if( $authorOfAll === false ) {
1782                                                 $reason = wfMsgForContent( 'excontent', $text );
1783                                         } else {
1784                                                 $reason = wfMsgForContent( 'excontentauthor', $text, $authorOfAll );
1785                                         }
1786                                 } else {
1787                                         $reason = wfMsgForContent( 'exbeforeblank', $text );
1788                                 }
1789                         }
1790                 }
1791
1792                 return $this->confirmDelete( '', $reason );
1793         }
1794
1795         /**
1796          * Get the last N authors
1797          * @param int $num Number of revisions to get
1798          * @param string $revLatest The latest rev_id, selected from the master (optional)
1799          * @return array Array of authors, duplicates not removed
1800          */
1801         function getLastNAuthors( $num, $revLatest = 0 ) {
1802                 $fname = 'Article::getLastNAuthors';
1803                 wfProfileIn( $fname );
1804
1805                 // First try the slave
1806                 // If that doesn't have the latest revision, try the master
1807                 $continue = 2;
1808                 $db =& wfGetDB( DB_SLAVE );
1809                 do {
1810                         $res = $db->select( array( 'page', 'revision' ),
1811                                 array( 'rev_id', 'rev_user_text' ),
1812                                 array(
1813                                         'page_namespace' => $this->mTitle->getNamespace(),
1814                                         'page_title' => $this->mTitle->getDBkey(),
1815                                         'rev_page = page_id'
1816                                 ), $fname, $this->getSelectOptions( array(
1817                                         'ORDER BY' => 'rev_timestamp DESC',
1818                                         'LIMIT' => $num
1819                                 ) )
1820                         );
1821                         if ( !$res ) {
1822                                 wfProfileOut( $fname );
1823                                 return array();
1824                         }
1825                         $row = $db->fetchObject( $res );
1826                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1827                                 $db =& wfGetDB( DB_MASTER );
1828                                 $continue--;
1829                         } else {
1830                                 $continue = 0;
1831                         }
1832                 } while ( $continue );
1833
1834                 $authors = array( $row->rev_user_text );
1835                 while ( $row = $db->fetchObject( $res ) ) {
1836                         $authors[] = $row->rev_user_text;
1837                 }
1838                 wfProfileOut( $fname );
1839                 return $authors;
1840         }
1841
1842         /**
1843          * Output deletion confirmation dialog
1844          */
1845         function confirmDelete( $par, $reason ) {
1846                 global $wgOut, $wgUser;
1847
1848                 wfDebug( "Article::confirmDelete\n" );
1849
1850                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
1851                 $wgOut->setSubtitle( wfMsg( 'deletesub', $sub ) );
1852                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1853                 $wgOut->addWikiText( wfMsg( 'confirmdeletetext' ) );
1854
1855                 $formaction = $this->mTitle->escapeLocalURL( 'action=delete' . $par );
1856
1857                 $confirm = htmlspecialchars( wfMsg( 'deletepage' ) );
1858                 $delcom = htmlspecialchars( wfMsg( 'deletecomment' ) );
1859                 $token = htmlspecialchars( $wgUser->editToken() );
1860
1861                 $wgOut->addHTML( "
1862 <form id='deleteconfirm' method='post' action=\"{$formaction}\">
1863         <table border='0'>
1864                 <tr>
1865                         <td align='right'>
1866                                 <label for='wpReason'>{$delcom}:</label>
1867                         </td>
1868                         <td align='left'>
1869                                 <input type='text' size='60' name='wpReason' id='wpReason' value=\"" . htmlspecialchars( $reason ) . "\" />
1870                         </td>
1871                 </tr>
1872                 <tr>
1873                         <td>&nbsp;</td>
1874                         <td>
1875                                 <input type='submit' name='wpConfirmB' value=\"{$confirm}\" />
1876                         </td>
1877                 </tr>
1878         </table>
1879         <input type='hidden' name='wpEditToken' value=\"{$token}\" />
1880 </form>\n" );
1881
1882                 $wgOut->returnToMain( false );
1883         }
1884
1885
1886         /**
1887          * Perform a deletion and output success or failure messages
1888          */
1889         function doDelete( $reason ) {
1890                 global $wgOut, $wgUser;
1891                 $fname = 'Article::doDelete';
1892                 wfDebug( $fname."\n" );
1893
1894                 if (wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason))) {
1895                         if ( $this->doDeleteArticle( $reason ) ) {
1896                                 $deleted = $this->mTitle->getPrefixedText();
1897
1898                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
1899                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1900
1901                                 $loglink = '[[Special:Log/delete|' . wfMsg( 'deletionlog' ) . ']]';
1902                                 $text = wfMsg( 'deletedtext', $deleted, $loglink );
1903
1904                                 $wgOut->addWikiText( $text );
1905                                 $wgOut->returnToMain( false );
1906                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason));
1907                         } else {
1908                                 $wgOut->fatalError( wfMsg( 'cannotdelete' ) );
1909                         }
1910                 }
1911         }
1912
1913         /**
1914          * Back-end article deletion
1915          * Deletes the article with database consistency, writes logs, purges caches
1916          * Returns success
1917          */
1918         function doDeleteArticle( $reason ) {
1919                 global $wgUseSquid, $wgDeferredUpdateList;
1920                 global $wgPostCommitUpdateList, $wgUseTrackbacks;
1921
1922                 $fname = 'Article::doDeleteArticle';
1923                 wfDebug( $fname."\n" );
1924
1925                 $dbw =& wfGetDB( DB_MASTER );
1926                 $ns = $this->mTitle->getNamespace();
1927                 $t = $this->mTitle->getDBkey();
1928                 $id = $this->mTitle->getArticleID();
1929
1930                 if ( $t == '' || $id == 0 ) {
1931                         return false;
1932                 }
1933
1934                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
1935                 array_push( $wgDeferredUpdateList, $u );
1936
1937                 $linksTo = $this->mTitle->getLinksTo();
1938
1939                 # Squid purging
1940                 if ( $wgUseSquid ) {
1941                         $urls = array(
1942                                 $this->mTitle->getInternalURL(),
1943                                 $this->mTitle->getInternalURL( 'history' )
1944                         );
1945
1946                         $u = SquidUpdate::newFromTitles( $linksTo, $urls );
1947                         array_push( $wgPostCommitUpdateList, $u );
1948
1949                 }
1950
1951                 # Client and file cache invalidation
1952                 Title::touchArray( $linksTo );
1953
1954
1955                 // For now, shunt the revision data into the archive table.
1956                 // Text is *not* removed from the text table; bulk storage
1957                 // is left intact to avoid breaking block-compression or
1958                 // immutable storage schemes.
1959                 //
1960                 // For backwards compatibility, note that some older archive
1961                 // table entries will have ar_text and ar_flags fields still.
1962                 //
1963                 // In the future, we may keep revisions and mark them with
1964                 // the rev_deleted field, which is reserved for this purpose.
1965                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
1966                         array(
1967                                 'ar_namespace'  => 'page_namespace',
1968                                 'ar_title'      => 'page_title',
1969                                 'ar_comment'    => 'rev_comment',
1970                                 'ar_user'       => 'rev_user',
1971                                 'ar_user_text'  => 'rev_user_text',
1972                                 'ar_timestamp'  => 'rev_timestamp',
1973                                 'ar_minor_edit' => 'rev_minor_edit',
1974                                 'ar_rev_id'     => 'rev_id',
1975                                 'ar_text_id'    => 'rev_text_id',
1976                         ), array(
1977                                 'page_id' => $id,
1978                                 'page_id = rev_page'
1979                         ), $fname
1980                 );
1981
1982                 # Now that it's safely backed up, delete it
1983                 $dbw->delete( 'revision', array( 'rev_page' => $id ), $fname );
1984                 $dbw->delete( 'page', array( 'page_id' => $id ), $fname);
1985
1986                 if ($wgUseTrackbacks)
1987                         $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), $fname );
1988
1989                 # Clean up recentchanges entries...
1990                 $dbw->delete( 'recentchanges', array( 'rc_namespace' => $ns, 'rc_title' => $t ), $fname );
1991
1992                 # Finally, clean up the link tables
1993                 $t = $this->mTitle->getPrefixedDBkey();
1994
1995                 Article::onArticleDelete( $this->mTitle );
1996
1997                 # Delete outgoing links
1998                 $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
1999                 $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2000                 $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2001                 $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2002                 $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2003                 $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2004
2005                 # Log the deletion
2006                 $log = new LogPage( 'delete' );
2007                 $log->addEntry( 'delete', $this->mTitle, $reason );
2008
2009                 # Clear the cached article id so the interface doesn't act like we exist
2010                 $this->mTitle->resetArticleID( 0 );
2011                 $this->mTitle->mArticleID = 0;
2012                 return true;
2013         }
2014
2015         /**
2016          * Revert a modification
2017          */
2018         function rollback() {
2019                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2020                 $fname = 'Article::rollback';
2021
2022                 if( $wgUser->isAllowed( 'rollback' ) ) {
2023                         if( $wgUser->isBlocked() ) {
2024                                 $wgOut->blockedPage();
2025                                 return;
2026                         }
2027                 } else {
2028                         $wgOut->permissionRequired( 'rollback' );
2029                         return;
2030                 }
2031
2032                 if ( wfReadOnly() ) {
2033                         $wgOut->readOnlyPage( $this->getContent() );
2034                         return;
2035                 }
2036                 if( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ),
2037                         array( $this->mTitle->getPrefixedText(),
2038                                 $wgRequest->getVal( 'from' ) )  ) ) {
2039                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2040                         $wgOut->addWikiText( wfMsg( 'sessionfailure' ) );
2041                         return;
2042                 }
2043                 $dbw =& wfGetDB( DB_MASTER );
2044
2045                 # Enhanced rollback, marks edits rc_bot=1
2046                 $bot = $wgRequest->getBool( 'bot' );
2047
2048                 # Replace all this user's current edits with the next one down
2049                 $tt = $this->mTitle->getDBKey();
2050                 $n = $this->mTitle->getNamespace();
2051
2052                 # Get the last editor, lock table exclusively
2053                 $dbw->begin();
2054                 $current = Revision::newFromTitle( $this->mTitle );
2055                 if( is_null( $current ) ) {
2056                         # Something wrong... no page?
2057                         $dbw->rollback();
2058                         $wgOut->addHTML( wfMsg( 'notanarticle' ) );
2059                         return;
2060                 }
2061
2062                 $from = str_replace( '_', ' ', $wgRequest->getVal( 'from' ) );
2063                 if( $from != $current->getUserText() ) {
2064                         $wgOut->setPageTitle( wfMsg('rollbackfailed') );
2065                         $wgOut->addWikiText( wfMsg( 'alreadyrolled',
2066                                 htmlspecialchars( $this->mTitle->getPrefixedText()),
2067                                 htmlspecialchars( $from ),
2068                                 htmlspecialchars( $current->getUserText() ) ) );
2069                         if( $current->getComment() != '') {
2070                                 $wgOut->addHTML(
2071                                         wfMsg( 'editcomment',
2072                                         htmlspecialchars( $current->getComment() ) ) );
2073                         }
2074                         return;
2075                 }
2076
2077                 # Get the last edit not by this guy
2078                 $user = intval( $current->getUser() );
2079                 $user_text = $dbw->addQuotes( $current->getUserText() );
2080                 $s = $dbw->selectRow( 'revision',
2081                         array( 'rev_id', 'rev_timestamp' ),
2082                         array(
2083                                 'rev_page' => $current->getPage(),
2084                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
2085                         ), $fname,
2086                         array(
2087                                 'USE INDEX' => 'page_timestamp',
2088                                 'ORDER BY'  => 'rev_timestamp DESC' )
2089                         );
2090                 if( $s === false ) {
2091                         # Something wrong
2092                         $dbw->rollback();
2093                         $wgOut->setPageTitle(wfMsg('rollbackfailed'));
2094                         $wgOut->addHTML( wfMsg( 'cantrollback' ) );
2095                         return;
2096                 }
2097
2098                 $set = array();
2099                 if ( $bot ) {
2100                         # Mark all reverted edits as bot
2101                         $set['rc_bot'] = 1;
2102                 }
2103                 if ( $wgUseRCPatrol ) {
2104                         # Mark all reverted edits as patrolled
2105                         $set['rc_patrolled'] = 1;
2106                 }
2107
2108                 if ( $set ) {
2109                         $dbw->update( 'recentchanges', $set,
2110                                 array( /* WHERE */
2111                                         'rc_cur_id'    => $current->getPage(),
2112                                         'rc_user_text' => $current->getUserText(),
2113                                         "rc_timestamp > '{$s->rev_timestamp}'",
2114                                 ), $fname
2115                         );
2116                 }
2117
2118                 # Get the edit summary
2119                 $target = Revision::newFromId( $s->rev_id );
2120                 $newComment = wfMsgForContent( 'revertpage', $target->getUserText(), $from );
2121                 $newComment = $wgRequest->getText( 'summary', $newComment );
2122
2123                 # Save it!
2124                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2125                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2126                 $wgOut->addHTML( '<h2>' . htmlspecialchars( $newComment ) . "</h2>\n<hr />\n" );
2127
2128                 $this->updateArticle( $target->getText(), $newComment, 1, $this->mTitle->userIsWatching(), $bot );
2129                 Article::onArticleEdit( $this->mTitle );
2130
2131                 $dbw->commit();
2132                 $wgOut->returnToMain( false );
2133         }
2134
2135
2136         /**
2137          * Do standard deferred updates after page view
2138          * @private
2139          */
2140         function viewUpdates() {
2141                 global $wgDeferredUpdateList;
2142
2143                 if ( 0 != $this->getID() ) {
2144                         global $wgDisableCounters;
2145                         if( !$wgDisableCounters ) {
2146                                 Article::incViewCount( $this->getID() );
2147                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2148                                 array_push( $wgDeferredUpdateList, $u );
2149                         }
2150                 }
2151
2152                 # Update newtalk / watchlist notification status
2153                 global $wgUser;
2154                 $wgUser->clearNotification( $this->mTitle );
2155         }
2156
2157         /**
2158          * Do standard deferred updates after page edit.
2159          * Every 1000th edit, prune the recent changes table.
2160          * @private
2161          * @param string $text
2162          */
2163         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid) {
2164                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser;
2165
2166                 $fname = 'Article::editUpdates';
2167                 wfProfileIn( $fname );
2168
2169                 # Parse the text
2170                 $options = new ParserOptions;
2171                 $options->setTidy(true);
2172                 $poutput = $wgParser->parse( $text, $this->mTitle, $options, true, true, $newid );
2173
2174                 # Save it to the parser cache
2175                 $parserCache =& ParserCache::singleton();
2176                 $parserCache->save( $poutput, $this, $wgUser );
2177
2178                 # Update the links tables
2179                 $u = new LinksUpdate( $this->mTitle, $poutput );
2180                 $u->doUpdate();
2181
2182                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2183                         wfSeedRandom();
2184                         if ( 0 == mt_rand( 0, 999 ) ) {
2185                                 # Periodically flush old entries from the recentchanges table.
2186                                 global $wgRCMaxAge;
2187
2188                                 $dbw =& wfGetDB( DB_MASTER );
2189                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2190                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2191                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2192                                 $dbw->query( $sql );
2193                         }
2194                 }
2195
2196                 $id = $this->getID();
2197                 $title = $this->mTitle->getPrefixedDBkey();
2198                 $shortTitle = $this->mTitle->getDBkey();
2199
2200                 if ( 0 == $id ) {
2201                         wfProfileOut( $fname );
2202                         return;
2203                 }
2204
2205                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2206                 array_push( $wgDeferredUpdateList, $u );
2207                 $u = new SearchUpdate( $id, $title, $text );
2208                 array_push( $wgDeferredUpdateList, $u );
2209
2210                 # If this is another user's talk page, update newtalk
2211
2212                 if ($this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getName()) {
2213                         if (wfRunHooks('ArticleEditUpdateNewTalk', array(&$this)) ) {
2214                                 $other = User::newFromName( $shortTitle );
2215                                 if( is_null( $other ) && User::isIP( $shortTitle ) ) {
2216                                         // An anonymous user
2217                                         $other = new User();
2218                                         $other->setName( $shortTitle );
2219                                 }
2220                                 if( $other ) {
2221                                         $other->setNewtalk( true );
2222                                 }
2223                         }
2224                 }
2225
2226                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2227                         $wgMessageCache->replace( $shortTitle, $text );
2228                 }
2229
2230                 wfProfileOut( $fname );
2231         }
2232
2233         /**
2234          * Generate the navigation links when browsing through an article revisions
2235          * It shows the information as:
2236          *   Revision as of \<date\>; view current revision
2237          *   \<- Previous version | Next Version -\>
2238          *
2239          * @private
2240          * @param string $oldid         Revision ID of this article revision
2241          */
2242         function setOldSubtitle( $oldid=0 ) {
2243                 global $wgLang, $wgOut, $wgUser;
2244
2245                 $current = ( $oldid == $this->mLatest );
2246                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2247                 $sk = $wgUser->getSkin();
2248                 $lnk = $current
2249                         ? wfMsg( 'currentrevisionlink' )
2250                         : $lnk = $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2251                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2252                 $prevlink = $prev
2253                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2254                         : wfMsg( 'previousrevision' );
2255                 $nextlink = $current
2256                         ? wfMsg( 'nextrevision' )
2257                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2258                 $r = wfMsg( 'revisionasofwithlink', $td, $lnk, $prevlink, $nextlink );
2259                 $wgOut->setSubtitle( $r );
2260         }
2261
2262         /**
2263          * This function is called right before saving the wikitext,
2264          * so we can do things like signatures and links-in-context.
2265          *
2266          * @param string $text
2267          */
2268         function preSaveTransform( $text ) {
2269                 global $wgParser, $wgUser;
2270                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2271         }
2272
2273         /* Caching functions */
2274
2275         /**
2276          * checkLastModified returns true if it has taken care of all
2277          * output to the client that is necessary for this request.
2278          * (that is, it has sent a cached version of the page)
2279          */
2280         function tryFileCache() {
2281                 static $called = false;
2282                 if( $called ) {
2283                         wfDebug( " tryFileCache() -- called twice!?\n" );
2284                         return;
2285                 }
2286                 $called = true;
2287                 if($this->isFileCacheable()) {
2288                         $touched = $this->mTouched;
2289                         $cache = new CacheManager( $this->mTitle );
2290                         if($cache->isFileCacheGood( $touched )) {
2291                                 wfDebug( " tryFileCache() - about to load\n" );
2292                                 $cache->loadFromFileCache();
2293                                 return true;
2294                         } else {
2295                                 wfDebug( " tryFileCache() - starting buffer\n" );
2296                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2297                         }
2298                 } else {
2299                         wfDebug( " tryFileCache() - not cacheable\n" );
2300                 }
2301         }
2302
2303         /**
2304          * Check if the page can be cached
2305          * @return bool
2306          */
2307         function isFileCacheable() {
2308                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest;
2309                 extract( $wgRequest->getValues( 'action', 'oldid', 'diff', 'redirect', 'printable' ) );
2310
2311                 return $wgUseFileCache
2312                         and (!$wgShowIPinHeader)
2313                         and ($this->getID() != 0)
2314                         and ($wgUser->isAnon())
2315                         and (!$wgUser->getNewtalk())
2316                         and ($this->mTitle->getNamespace() != NS_SPECIAL )
2317                         and (empty( $action ) || $action == 'view')
2318                         and (!isset($oldid))
2319                         and (!isset($diff))
2320                         and (!isset($redirect))
2321                         and (!isset($printable))
2322                         and (!$this->mRedirectedFrom);
2323         }
2324
2325         /**
2326          * Loads page_touched and returns a value indicating if it should be used
2327          *
2328          */
2329         function checkTouched() {
2330                 $fname = 'Article::checkTouched';
2331                 if( !$this->mDataLoaded ) {
2332                         $this->loadPageData();
2333                 }
2334                 return !$this->mIsRedirect;
2335         }
2336
2337         /**
2338          * Get the page_touched field
2339          */
2340         function getTouched() {
2341                 # Ensure that page data has been loaded
2342                 if( !$this->mDataLoaded ) {
2343                         $this->loadPageData();
2344                 }
2345                 return $this->mTouched;
2346         }
2347
2348         /**
2349          * Get the page_latest field
2350          */
2351         function getLatest() {
2352                 if ( !$this->mDataLoaded ) {
2353                         $this->loadPageData();
2354                 }
2355                 return $this->mLatest;
2356         }
2357
2358         /**
2359          * Edit an article without doing all that other stuff
2360          * The article must already exist; link tables etc
2361          * are not updated, caches are not flushed.
2362          *
2363          * @param string $text text submitted
2364          * @param string $comment comment submitted
2365          * @param bool $minor whereas it's a minor modification
2366          */
2367         function quickEdit( $text, $comment = '', $minor = 0 ) {
2368                 $fname = 'Article::quickEdit';
2369                 wfProfileIn( $fname );
2370
2371                 $dbw =& wfGetDB( DB_MASTER );
2372                 $dbw->begin();
2373                 $revision = new Revision( array(
2374                         'page'       => $this->getId(),
2375                         'text'       => $text,
2376                         'comment'    => $comment,
2377                         'minor_edit' => $minor ? 1 : 0,
2378                         ) );
2379                 # fixme : $revisionId never used
2380                 $revisionId = $revision->insertOn( $dbw );
2381                 $this->updateRevisionOn( $dbw, $revision );
2382                 $dbw->commit();
2383
2384                 wfProfileOut( $fname );
2385         }
2386
2387         /**
2388          * Used to increment the view counter
2389          *
2390          * @static
2391          * @param integer $id article id
2392          */
2393         function incViewCount( $id ) {
2394                 $id = intval( $id );
2395                 global $wgHitcounterUpdateFreq, $wgDBtype;
2396
2397                 $dbw =& wfGetDB( DB_MASTER );
2398                 $pageTable = $dbw->tableName( 'page' );
2399                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
2400                 $acchitsTable = $dbw->tableName( 'acchits' );
2401
2402                 if( $wgHitcounterUpdateFreq <= 1 ){ //
2403                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
2404                         return;
2405                 }
2406
2407                 # Not important enough to warrant an error page in case of failure
2408                 $oldignore = $dbw->ignoreErrors( true );
2409
2410                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
2411
2412                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
2413                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
2414                         # Most of the time (or on SQL errors), skip row count check
2415                         $dbw->ignoreErrors( $oldignore );
2416                         return;
2417                 }
2418
2419                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
2420                 $row = $dbw->fetchObject( $res );
2421                 $rown = intval( $row->n );
2422                 if( $rown >= $wgHitcounterUpdateFreq ){
2423                         wfProfileIn( 'Article::incViewCount-collect' );
2424                         $old_user_abort = ignore_user_abort( true );
2425
2426                         if ($wgDBtype == 'mysql')
2427                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
2428                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
2429                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype".
2430                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
2431                                 'GROUP BY hc_id');
2432                         $dbw->query("DELETE FROM $hitcounterTable");
2433                         if ($wgDBtype == 'mysql')
2434                                 $dbw->query('UNLOCK TABLES');
2435                         $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
2436                                 'WHERE page_id = hc_id');
2437                         $dbw->query("DROP TABLE $acchitsTable");
2438
2439                         ignore_user_abort( $old_user_abort );
2440                         wfProfileOut( 'Article::incViewCount-collect' );
2441                 }
2442                 $dbw->ignoreErrors( $oldignore );
2443         }
2444
2445         /**#@+
2446          * The onArticle*() functions are supposed to be a kind of hooks
2447          * which should be called whenever any of the specified actions
2448          * are done.
2449          *
2450          * This is a good place to put code to clear caches, for instance.
2451          *
2452          * This is called on page move and undelete, as well as edit
2453          * @static
2454          * @param $title_obj a title object
2455          */
2456
2457         function onArticleCreate($title_obj) {
2458                 global $wgUseSquid, $wgPostCommitUpdateList;
2459
2460                 $title_obj->touchLinks();
2461                 $titles = $title_obj->getLinksTo();
2462
2463                 # Purge squid
2464                 if ( $wgUseSquid ) {
2465                         $urls = $title_obj->getSquidURLs();
2466                         foreach ( $titles as $linkTitle ) {
2467                                 $urls[] = $linkTitle->getInternalURL();
2468                         }
2469                         $u = new SquidUpdate( $urls );
2470                         array_push( $wgPostCommitUpdateList, $u );
2471                 }
2472         }
2473
2474         function onArticleDelete( $title ) {
2475                 global $wgMessageCache;
2476
2477                 $title->touchLinks();
2478
2479                 if( $title->getNamespace() == NS_MEDIAWIKI) {
2480                         $wgMessageCache->replace( $title->getDBkey(), false );
2481                 }
2482         }
2483
2484         /**
2485          * Purge caches on page update etc
2486          */
2487         function onArticleEdit( $title ) {
2488                 global $wgUseSquid, $wgPostCommitUpdateList, $wgUseFileCache;
2489
2490                 $urls = array();
2491
2492                 // Template namespace? Purge all articles linking here.
2493                 // FIXME: When a templatelinks table arrives, use it for all includes.
2494                 if ( $title->getNamespace() == NS_TEMPLATE) {
2495                         $titles = $title->getLinksTo();
2496                         Title::touchArray( $titles );
2497                         if ( $wgUseSquid ) {
2498                                 foreach ( $titles as $link ) {
2499                                         $urls[] = $link->getInternalURL();
2500                                 }
2501                         }
2502                 }
2503
2504                 # Squid updates
2505                 if ( $wgUseSquid ) {
2506                         $urls = array_merge( $urls, $title->getSquidURLs() );
2507                         $u = new SquidUpdate( $urls );
2508                         array_push( $wgPostCommitUpdateList, $u );
2509                 }
2510
2511                 # File cache
2512                 if ( $wgUseFileCache ) {
2513                         $cm = new CacheManager( $title );
2514                         @unlink( $cm->fileCacheName() );
2515                 }
2516         }
2517
2518         /**#@-*/
2519
2520         /**
2521          * Info about this page
2522          * Called for ?action=info when $wgAllowPageInfo is on.
2523          *
2524          * @public
2525          */
2526         function info() {
2527                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
2528                 $fname = 'Article::info';
2529
2530                 if ( !$wgAllowPageInfo ) {
2531                         $wgOut->errorpage( 'nosuchaction', 'nosuchactiontext' );
2532                         return;
2533                 }
2534
2535                 $page = $this->mTitle->getSubjectPage();
2536
2537                 $wgOut->setPagetitle( $page->getPrefixedText() );
2538                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ));
2539
2540                 # first, see if the page exists at all.
2541                 $exists = $page->getArticleId() != 0;
2542                 if( !$exists ) {
2543                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2544                                 $wgOut->addHTML(wfMsgWeirdKey ( $this->mTitle->getText() ) );
2545                         } else {
2546                                 $wgOut->addHTML(wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' ) );
2547                         }
2548                 } else {
2549                         $dbr =& wfGetDB( DB_SLAVE );
2550                         $wl_clause = array(
2551                                 'wl_title'     => $page->getDBkey(),
2552                                 'wl_namespace' => $page->getNamespace() );
2553                         $numwatchers = $dbr->selectField(
2554                                 'watchlist',
2555                                 'COUNT(*)',
2556                                 $wl_clause,
2557                                 $fname,
2558                                 $this->getSelectOptions() );
2559
2560                         $pageInfo = $this->pageCountInfo( $page );
2561                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
2562
2563                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
2564                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
2565                         if( $talkInfo ) {
2566                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
2567                         }
2568                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
2569                         if( $talkInfo ) {
2570                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
2571                         }
2572                         $wgOut->addHTML( '</ul>' );
2573
2574                 }
2575         }
2576
2577         /**
2578          * Return the total number of edits and number of unique editors
2579          * on a given page. If page does not exist, returns false.
2580          *
2581          * @param Title $title
2582          * @return array
2583          * @private
2584          */
2585         function pageCountInfo( $title ) {
2586                 $id = $title->getArticleId();
2587                 if( $id == 0 ) {
2588                         return false;
2589                 }
2590
2591                 $dbr =& wfGetDB( DB_SLAVE );
2592
2593                 $rev_clause = array( 'rev_page' => $id );
2594                 $fname = 'Article::pageCountInfo';
2595
2596                 $edits = $dbr->selectField(
2597                         'revision',
2598                         'COUNT(rev_page)',
2599                         $rev_clause,
2600                         $fname,
2601                         $this->getSelectOptions() );
2602
2603                 $authors = $dbr->selectField(
2604                         'revision',
2605                         'COUNT(DISTINCT rev_user_text)',
2606                         $rev_clause,
2607                         $fname,
2608                         $this->getSelectOptions() );
2609
2610                 return array( 'edits' => $edits, 'authors' => $authors );
2611         }
2612
2613         /**
2614          * Return a list of templates used by this article.
2615          * Uses the templatelinks table
2616          *
2617          * @return array Array of Title objects
2618          */
2619         function getUsedTemplates() {
2620                 $result = array();
2621                 $id = $this->mTitle->getArticleID();
2622                 if( $id == 0 ) {
2623                         return array();
2624                 }
2625
2626                 $dbr =& wfGetDB( DB_SLAVE );
2627                 $res = $dbr->select( array( 'templatelinks' ),
2628                         array( 'tl_namespace', 'tl_title' ),
2629                         array( 'tl_from' => $id ),
2630                         'Article:getUsedTemplates' );
2631                 if ( false !== $res ) {
2632                         if ( $dbr->numRows( $res ) ) {
2633                                 while ( $row = $dbr->fetchObject( $res ) ) {
2634                                         $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2635                                 }
2636                         }
2637                 }
2638                 $dbr->freeResult( $res );
2639                 return $result;
2640         }
2641 }
2642
2643 ?>