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