includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @package MediaWiki
   5  */
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * See design.txt for an overview.
  11  * Note: edit user interface and cache support functions have been
  12  * moved to separate EditPage and HTMLFileCache classes.
  13  *
  14  * @package MediaWiki
  15  */
  16 class Article {
  17         /**@{{
  18          * @private
  19          */
  20         var $mComment;                  //!<
  21         var $mContent;                  //!<
  22         var $mContentLoaded;    //!<
  23         var $mCounter;                  //!<
  24         var $mForUpdate;                //!<
  25         var $mGoodAdjustment;   //!<
  26         var $mLatest;                   //!<
  27         var $mMinorEdit;                //!<
  28         var $mOldId;                    //!<
  29         var $mRedirectedFrom;   //!<
  30         var $mRedirectUrl;              //!<
  31         var $mRevIdFetched;             //!<
  32         var $mRevision;                 //!<
  33         var $mTimestamp;                //!<
  34         var $mTitle;                    //!<
  35         var $mTotalAdjustment;  //!<
  36         var $mTouched;                  //!<
  37         var $mUser;                             //!<
  38         var $mUserText;                 //!<
  39         /**@}}*/
  40
  41         /**
  42          * Constructor and clear the article
  43          * @param $title Reference to a Title object.
  44          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  45          */
  46         function Article( &$title, $oldId = null ) {
  47                 $this->mTitle =& $title;
  48                 $this->mOldId = $oldId;
  49                 $this->clear();
  50         }
  51
  52         /**
  53          * Tell the page view functions that this view was redirected
  54          * from another page on the wiki.
  55          * @param $from Title object.
  56          */
  57         function setRedirectedFrom( $from ) {
  58                 $this->mRedirectedFrom = $from;
  59         }
  60
  61         /**
  62          * @return mixed false, Title of in-wiki target, or string with URL
  63          */
  64         function followRedirect() {
  65                 $text = $this->getContent();
  66                 $rt = Title::newFromRedirect( $text );
  67
  68                 # process if title object is valid and not special:userlogout
  69                 if( $rt ) {
  70                         if( $rt->getInterwiki() != '' ) {
  71                                 if( $rt->isLocal() ) {
  72                                         // Offsite wikis need an HTTP redirect.
  73                                         //
  74                                         // This can be hard to reverse and may produce loops,
  75                                         // so they may be disabled in the site configuration.
  76
  77                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
  78                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
  79                                 }
  80                         } else {
  81                                 if( $rt->getNamespace() == NS_SPECIAL ) {
  82                                         // Gotta handle redirects to special pages differently:
  83                                         // Fill the HTTP response "Location" header and ignore
  84                                         // the rest of the page we're on.
  85                                         //
  86                                         // This can be hard to reverse, so they may be disabled.
  87
  88                                         if( $rt->isSpecial( 'Userlogout' ) ) {
  89                                                 // rolleyes
  90                                         } else {
  91                                                 return $rt->getFullURL();
  92                                         }
  93                                 }
  94                                 return $rt;
  95                         }
  96                 }
  97
  98                 // No or invalid redirect
  99                 return false;
 100         }
 101
 102         /**
 103          * get the title object of the article
 104          */
 105         function getTitle() {
 106                 return $this->mTitle;
 107         }
 108
 109         /**
 110           * Clear the object
 111           * @private
 112           */
 113         function clear() {
 114                 $this->mDataLoaded    = false;
 115                 $this->mContentLoaded = false;
 116
 117                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 118                 $this->mRedirectedFrom = null; # Title object if set
 119                 $this->mUserText =
 120                 $this->mTimestamp = $this->mComment = '';
 121                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 122                 $this->mTouched = '19700101000000';
 123                 $this->mForUpdate = false;
 124                 $this->mIsRedirect = false;
 125                 $this->mRevIdFetched = 0;
 126                 $this->mRedirectUrl = false;
 127                 $this->mLatest = false;
 128         }
 129
 130         /**
 131          * Note that getContent/loadContent do not follow redirects anymore.
 132          * If you need to fetch redirectable content easily, try
 133          * the shortcut in Article::followContent()
 134          * FIXME
 135          * @todo There are still side-effects in this!
 136          *        In general, you should use the Revision class, not Article,
 137          *        to fetch text for purposes other than page views.
 138          *
 139          * @return Return the text of this revision
 140         */
 141         function getContent() {
 142                 global $wgUser, $wgOut;
 143
 144                 wfProfileIn( __METHOD__ );
 145
 146                 if ( 0 == $this->getID() ) {
 147                         wfProfileOut( __METHOD__ );
 148                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 149
 150                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 151                                 $ret = wfMsgWeirdKey ( $this->mTitle->getText() ) ;
 152                         } else {
 153                                 $ret = wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' );
 154                         }
 155
 156                         return "<div class='noarticletext'>$ret</div>";
 157                 } else {
 158                         $this->loadContent();
 159                         wfProfileOut( __METHOD__ );
 160                         return $this->mContent;
 161                 }
 162         }
 163
 164         /**
 165          * This function returns the text of a section, specified by a number ($section).
 166          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 167          * the first section before any such heading (section 0).
 168          *
 169          * If a section contains subsections, these are also returned.
 170          *
 171          * @param $text String: text to look in
 172          * @param $section Integer: section number
 173          * @return string text of the requested section
 174          * @deprecated
 175          */
 176         function getSection($text,$section) {
 177                 global $wgParser;
 178                 return $wgParser->getSection( $text, $section );
 179         }
 180
 181         /**
 182          * @return int The oldid of the article that is to be shown, 0 for the
 183          *             current revision
 184          */
 185         function getOldID() {
 186                 if ( is_null( $this->mOldId ) ) {
 187                         $this->mOldId = $this->getOldIDFromRequest();
 188                 }
 189                 return $this->mOldId;
 190         }
 191
 192         /**
 193          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 194          *
 195          * @return int The old id for the request
 196          */
 197         function getOldIDFromRequest() {
 198                 global $wgRequest;
 199                 $this->mRedirectUrl = false;
 200                 $oldid = $wgRequest->getVal( 'oldid' );
 201                 if ( isset( $oldid ) ) {
 202                         $oldid = intval( $oldid );
 203                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 204                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 205                                 if ( $nextid  ) {
 206                                         $oldid = $nextid;
 207                                 } else {
 208                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 209                                 }
 210                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 211                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 212                                 if ( $previd ) {
 213                                         $oldid = $previd;
 214                                 } else {
 215                                         # TODO
 216                                 }
 217                         }
 218                         # unused:
 219                         # $lastid = $oldid;
 220                 }
 221
 222                 if ( !$oldid ) {
 223                         $oldid = 0;
 224                 }
 225                 return $oldid;
 226         }
 227
 228         /**
 229          * Load the revision (including text) into this object
 230          */
 231         function loadContent() {
 232                 if ( $this->mContentLoaded ) return;
 233
 234                 # Query variables :P
 235                 $oldid = $this->getOldID();
 236
 237                 # Pre-fill content with error message so that if something
 238                 # fails we'll have something telling us what we intended.
 239                 $this->mOldId = $oldid;
 240                 $this->fetchContent( $oldid );
 241         }
 242
 243
 244         /**
 245          * Fetch a page record with the given conditions
 246          * @param Database $dbr
 247          * @param array    $conditions
 248          * @private
 249          */
 250         function pageData( &$dbr, $conditions ) {
 251                 $fields = array(
 252                                 'page_id',
 253                                 'page_namespace',
 254                                 'page_title',
 255                                 'page_restrictions',
 256                                 'page_counter',
 257                                 'page_is_redirect',
 258                                 'page_is_new',
 259                                 'page_random',
 260                                 'page_touched',
 261                                 'page_latest',
 262                                 'page_len' ) ;
 263                 wfRunHooks( 'ArticlePageDataBefore', array( &$this , &$fields ) )       ;
 264                 $row = $dbr->selectRow( 'page',
 265                         $fields,
 266                         $conditions,
 267                         'Article::pageData' );
 268                 wfRunHooks( 'ArticlePageDataAfter', array( &$this , &$row ) )   ;
 269                 return $row ;
 270         }
 271
 272         /**
 273          * @param Database $dbr
 274          * @param Title $title
 275          */
 276         function pageDataFromTitle( &$dbr, $title ) {
 277                 return $this->pageData( $dbr, array(
 278                         'page_namespace' => $title->getNamespace(),
 279                         'page_title'     => $title->getDBkey() ) );
 280         }
 281
 282         /**
 283          * @param Database $dbr
 284          * @param int $id
 285          */
 286         function pageDataFromId( &$dbr, $id ) {
 287                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 288         }
 289
 290         /**
 291          * Set the general counter, title etc data loaded from
 292          * some source.
 293          *
 294          * @param object $data
 295          * @private
 296          */
 297         function loadPageData( $data = 'fromdb' ) {
 298                 if ( $data === 'fromdb' ) {
 299                         $dbr =& $this->getDB();
 300                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 301                 }
 302
 303                 $lc =& LinkCache::singleton();
 304                 if ( $data ) {
 305                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle );
 306
 307                         $this->mTitle->mArticleID = $data->page_id;
 308                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 309                         $this->mTitle->mRestrictionsLoaded = true;
 310
 311                         $this->mCounter     = $data->page_counter;
 312                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 313                         $this->mIsRedirect  = $data->page_is_redirect;
 314                         $this->mLatest      = $data->page_latest;
 315                 } else {
 316                         if ( is_object( $this->mTitle ) ) {
 317                                 $lc->addBadLinkObj( $this->mTitle );
 318                         }
 319                         $this->mTitle->mArticleID = 0;
 320                 }
 321
 322                 $this->mDataLoaded  = true;
 323         }
 324
 325         /**
 326          * Get text of an article from database
 327          * Does *NOT* follow redirects.
 328          * @param int $oldid 0 for whatever the latest revision is
 329          * @return string
 330          */
 331         function fetchContent( $oldid = 0 ) {
 332                 if ( $this->mContentLoaded ) {
 333                         return $this->mContent;
 334                 }
 335
 336                 $dbr =& $this->getDB();
 337
 338                 # Pre-fill content with error message so that if something
 339                 # fails we'll have something telling us what we intended.
 340                 $t = $this->mTitle->getPrefixedText();
 341                 if( $oldid ) {
 342                         $t .= ',oldid='.$oldid;
 343                 }
 344                 $this->mContent = wfMsg( 'missingarticle', $t ) ;
 345
 346                 if( $oldid ) {
 347                         $revision = Revision::newFromId( $oldid );
 348                         if( is_null( $revision ) ) {
 349                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 350                                 return false;
 351                         }
 352                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 353                         if( !$data ) {
 354                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 355                                 return false;
 356                         }
 357                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 358                         $this->loadPageData( $data );
 359                 } else {
 360                         if( !$this->mDataLoaded ) {
 361                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 362                                 if( !$data ) {
 363                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 364                                         return false;
 365                                 }
 366                                 $this->loadPageData( $data );
 367                         }
 368                         $revision = Revision::newFromId( $this->mLatest );
 369                         if( is_null( $revision ) ) {
 370                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$data->page_latest}\n" );
 371                                 return false;
 372                         }
 373                 }
 374
 375                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 376                 // We should instead work with the Revision object when we need it...
 377                 $this->mContent = $revision->userCan( Revision::DELETED_TEXT ) ? $revision->getRawText() : "";
 378                 //$this->mContent   = $revision->getText();
 379
 380                 $this->mUser      = $revision->getUser();
 381                 $this->mUserText  = $revision->getUserText();
 382                 $this->mComment   = $revision->getComment();
 383                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 384
 385                 $this->mRevIdFetched = $revision->getID();
 386                 $this->mContentLoaded = true;
 387                 $this->mRevision =& $revision;
 388
 389                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 390
 391                 return $this->mContent;
 392         }
 393
 394         /**
 395          * Read/write accessor to select FOR UPDATE
 396          *
 397          * @param $x Mixed: FIXME
 398          */
 399         function forUpdate( $x = NULL ) {
 400                 return wfSetVar( $this->mForUpdate, $x );
 401         }
 402
 403         /**
 404          * Get the database which should be used for reads
 405          *
 406          * @return Database
 407          */
 408         function &getDB() {
 409                 $ret =& wfGetDB( DB_MASTER );
 410                 return $ret;
 411         }
 412
 413         /**
 414          * Get options for all SELECT statements
 415          *
 416          * @param $options Array: an optional options array which'll be appended to
 417          *                       the default
 418          * @return Array: options
 419          */
 420         function getSelectOptions( $options = '' ) {
 421                 if ( $this->mForUpdate ) {
 422                         if ( is_array( $options ) ) {
 423                                 $options[] = 'FOR UPDATE';
 424                         } else {
 425                                 $options = 'FOR UPDATE';
 426                         }
 427                 }
 428                 return $options;
 429         }
 430
 431         /**
 432          * @return int Page ID
 433          */
 434         function getID() {
 435                 if( $this->mTitle ) {
 436                         return $this->mTitle->getArticleID();
 437                 } else {
 438                         return 0;
 439                 }
 440         }
 441
 442         /**
 443          * @return bool Whether or not the page exists in the database
 444          */
 445         function exists() {
 446                 return $this->getId() != 0;
 447         }
 448
 449         /**
 450          * @return int The view count for the page
 451          */
 452         function getCount() {
 453                 if ( -1 == $this->mCounter ) {
 454                         $id = $this->getID();
 455                         if ( $id == 0 ) {
 456                                 $this->mCounter = 0;
 457                         } else {
 458                                 $dbr =& wfGetDB( DB_SLAVE );
 459                                 $this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
 460                                         'Article::getCount', $this->getSelectOptions() );
 461                         }
 462                 }
 463                 return $this->mCounter;
 464         }
 465
 466         /**
 467          * Determine whether a page  would be suitable for being counted as an
 468          * article in the site_stats table based on the title & its content
 469          *
 470          * @param $text String: text to analyze
 471          * @return bool
 472          */
 473         function isCountable( $text ) {
 474                 global $wgUseCommaCount, $wgContentNamespaces;
 475
 476                 $token = $wgUseCommaCount ? ',' : '[[';
 477                 return
 478                         array_search( $this->mTitle->getNamespace(), $wgContentNamespaces ) !== false
 479                         && ! $this->isRedirect( $text )
 480                         && in_string( $token, $text );
 481         }
 482
 483         /**
 484          * Tests if the article text represents a redirect
 485          *
 486          * @param $text String: FIXME
 487          * @return bool
 488          */
 489         function isRedirect( $text = false ) {
 490                 if ( $text === false ) {
 491                         $this->loadContent();
 492                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 493                 } else {
 494                         $titleObj = Title::newFromRedirect( $text );
 495                 }
 496                 return $titleObj !== NULL;
 497         }
 498
 499         /**
 500          * Returns true if the currently-referenced revision is the current edit
 501          * to this page (and it exists).
 502          * @return bool
 503          */
 504         function isCurrent() {
 505                 return $this->exists() &&
 506                         isset( $this->mRevision ) &&
 507                         $this->mRevision->isCurrent();
 508         }
 509
 510         /**
 511          * Loads everything except the text
 512          * This isn't necessary for all uses, so it's only done if needed.
 513          * @private
 514          */
 515         function loadLastEdit() {
 516                 if ( -1 != $this->mUser )
 517                         return;
 518
 519                 # New or non-existent articles have no user information
 520                 $id = $this->getID();
 521                 if ( 0 == $id ) return;
 522
 523                 $this->mLastRevision = Revision::loadFromPageId( $this->getDB(), $id );
 524                 if( !is_null( $this->mLastRevision ) ) {
 525                         $this->mUser      = $this->mLastRevision->getUser();
 526                         $this->mUserText  = $this->mLastRevision->getUserText();
 527                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 528                         $this->mComment   = $this->mLastRevision->getComment();
 529                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 530                         $this->mRevIdFetched = $this->mLastRevision->getID();
 531                 }
 532         }
 533
 534         function getTimestamp() {
 535                 // Check if the field has been filled by ParserCache::get()
 536                 if ( !$this->mTimestamp ) {
 537                         $this->loadLastEdit();
 538                 }
 539                 return wfTimestamp(TS_MW, $this->mTimestamp);
 540         }
 541
 542         function getUser() {
 543                 $this->loadLastEdit();
 544                 return $this->mUser;
 545         }
 546
 547         function getUserText() {
 548                 $this->loadLastEdit();
 549                 return $this->mUserText;
 550         }
 551
 552         function getComment() {
 553                 $this->loadLastEdit();
 554                 return $this->mComment;
 555         }
 556
 557         function getMinorEdit() {
 558                 $this->loadLastEdit();
 559                 return $this->mMinorEdit;
 560         }
 561
 562         function getRevIdFetched() {
 563                 $this->loadLastEdit();
 564                 return $this->mRevIdFetched;
 565         }
 566
 567         /**
 568          * @todo Document, fixme $offset never used.
 569          * @param $limit Integer: default 0.
 570          * @param $offset Integer: default 0.
 571          */
 572         function getContributors($limit = 0, $offset = 0) {
 573                 # XXX: this is expensive; cache this info somewhere.
 574
 575                 $contribs = array();
 576                 $dbr =& wfGetDB( DB_SLAVE );
 577                 $revTable = $dbr->tableName( 'revision' );
 578                 $userTable = $dbr->tableName( 'user' );
 579                 $user = $this->getUser();
 580                 $pageId = $this->getId();
 581
 582                 $sql = "SELECT rev_user, rev_user_text, user_real_name, MAX(rev_timestamp) as timestamp
 583                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 584                         WHERE rev_page = $pageId
 585                         AND rev_user != $user
 586                         GROUP BY rev_user, rev_user_text, user_real_name
 587                         ORDER BY timestamp DESC";
 588
 589                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 590                 $sql .= ' '. $this->getSelectOptions();
 591
 592                 $res = $dbr->query($sql, __METHOD__);
 593
 594                 while ( $line = $dbr->fetchObject( $res ) ) {
 595                         $contribs[] = array($line->rev_user, $line->rev_user_text, $line->user_real_name);
 596                 }
 597
 598                 $dbr->freeResult($res);
 599                 return $contribs;
 600         }
 601
 602         /**
 603          * This is the default action of the script: just view the page of
 604          * the given title.
 605         */
 606         function view() {
 607                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 608                 global $wgEnableParserCache, $wgStylePath, $wgUseRCPatrol, $wgParser;
 609                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies;
 610                 $sk = $wgUser->getSkin();
 611
 612                 wfProfileIn( __METHOD__ );
 613
 614                 $parserCache =& ParserCache::singleton();
 615                 $ns = $this->mTitle->getNamespace(); # shortcut
 616
 617                 # Get variables from query string
 618                 $oldid = $this->getOldID();
 619
 620                 # getOldID may want us to redirect somewhere else
 621                 if ( $this->mRedirectUrl ) {
 622                         $wgOut->redirect( $this->mRedirectUrl );
 623                         wfProfileOut( __METHOD__ );
 624                         return;
 625                 }
 626
 627                 $diff = $wgRequest->getVal( 'diff' );
 628                 $rcid = $wgRequest->getVal( 'rcid' );
 629                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 630
 631                 $wgOut->setArticleFlag( true );
 632                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 633                         $policy = $wgNamespaceRobotPolicies[$ns];
 634                 } else {
 635                         $policy = 'index,follow';
 636                 }
 637                 $wgOut->setRobotpolicy( $policy );
 638
 639                 # If we got diff and oldid in the query, we want to see a
 640                 # diff page instead of the article.
 641
 642                 if ( !is_null( $diff ) ) {
 643                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 644
 645                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid );
 646                         // DifferenceEngine directly fetched the revision:
 647                         $this->mRevIdFetched = $de->mNewid;
 648                         $de->showDiffPage();
 649
 650                         // Needed to get the page's current revision
 651                         $this->loadPageData();
 652                         if( $diff == 0 || $diff == $this->mLatest ) {
 653                                 # Run view updates for current revision only
 654                                 $this->viewUpdates();
 655                         }
 656                         wfProfileOut( __METHOD__ );
 657                         return;
 658                 }
 659
 660                 if ( empty( $oldid ) && $this->checkTouched() ) {
 661                         $wgOut->setETag($parserCache->getETag($this, $wgUser));
 662
 663                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 664                                 wfProfileOut( __METHOD__ );
 665                                 return;
 666                         } else if ( $this->tryFileCache() ) {
 667                                 # tell wgOut that output is taken care of
 668                                 $wgOut->disable();
 669                                 $this->viewUpdates();
 670                                 wfProfileOut( __METHOD__ );
 671                                 return;
 672                         }
 673                 }
 674
 675                 # Should the parser cache be used?
 676                 $pcache = $wgEnableParserCache &&
 677                         intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
 678                         $this->exists() &&
 679                         empty( $oldid );
 680                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 681                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 682                         wfIncrStats( 'pcache_miss_stub' );
 683                 }
 684
 685                 $wasRedirected = false;
 686                 if ( isset( $this->mRedirectedFrom ) ) {
 687                         // This is an internally redirected page view.
 688                         // We'll need a backlink to the source page for navigation.
 689                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 690                                 $sk = $wgUser->getSkin();
 691                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 692                                 $s = wfMsg( 'redirectedfrom', $redir );
 693                                 $wgOut->setSubtitle( $s );
 694                                 $wasRedirected = true;
 695                         }
 696                 } elseif ( !empty( $rdfrom ) ) {
 697                         // This is an externally redirected view, from some other wiki.
 698                         // If it was reported from a trusted site, supply a backlink.
 699                         global $wgRedirectSources;
 700                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 701                                 $sk = $wgUser->getSkin();
 702                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 703                                 $s = wfMsg( 'redirectedfrom', $redir );
 704                                 $wgOut->setSubtitle( $s );
 705                                 $wasRedirected = true;
 706                         }
 707                 }
 708
 709                 $outputDone = false;
 710                 if ( $pcache ) {
 711                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 712                                 wfRunHooks( 'ArticleViewHeader', array( &$this ) );
 713                                 $outputDone = true;
 714                         }
 715                 }
 716                 if ( !$outputDone ) {
 717                         $text = $this->getContent();
 718                         if ( $text === false ) {
 719                                 # Failed to load, replace text with error message
 720                                 $t = $this->mTitle->getPrefixedText();
 721                                 if( $oldid ) {
 722                                         $t .= ',oldid='.$oldid;
 723                                         $text = wfMsg( 'missingarticle', $t );
 724                                 } else {
 725                                         $text = wfMsg( 'noarticletext', $t );
 726                                 }
 727                         }
 728
 729                         # Another whitelist check in case oldid is altering the title
 730                         if ( !$this->mTitle->userCanRead() ) {
 731                                 $wgOut->loginToUse();
 732                                 $wgOut->output();
 733                                 exit;
 734                         }
 735
 736                         # We're looking at an old revision
 737
 738                         if ( !empty( $oldid ) ) {
 739                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 740                                 if( is_null( $this->mRevision ) ) {
 741                                         // FIXME: This would be a nice place to load the 'no such page' text.
 742                                 } else {
 743                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 744                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 745                                                 if( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 746                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-permission' ) );
 747                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 748                                                         return;
 749                                                 } else {
 750                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-view' ) );
 751                                                         // and we are allowed to see...
 752                                                 }
 753                                         }
 754                                 }
 755
 756                         }
 757                 }
 758                 if( !$outputDone ) {
 759                         /**
 760                          * @fixme: this hook doesn't work most of the time, as it doesn't
 761                          * trigger when the parser cache is used.
 762                          */
 763                         wfRunHooks( 'ArticleViewHeader', array( &$this ) ) ;
 764                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 765                         # wrap user css and user js in pre and don't parse
 766                         # XXX: use $this->mTitle->usCssJsSubpage() when php is fixed/ a workaround is found
 767                         if (
 768                                 $ns == NS_USER &&
 769                                 preg_match('/\\/[\\w]+\\.(css|js)$/', $this->mTitle->getDBkey())
 770                         ) {
 771                                 $wgOut->addWikiText( wfMsg('clearyourcache'));
 772                                 $wgOut->addHTML( '<pre>'.htmlspecialchars($this->mContent)."\n</pre>" );
 773                         } else if ( $rt = Title::newFromRedirect( $text ) ) {
 774                                 # Display redirect
 775                                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 776                                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 777                                 # Don't overwrite the subtitle if this was an old revision
 778                                 if( !$wasRedirected && $this->isCurrent() ) {
 779                                         $wgOut->setSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 780                                 }
 781                                 $link = $sk->makeLinkObj( $rt );
 782
 783                                 $wgOut->addHTML( '<img src="'.$imageUrl.'" alt="#REDIRECT" />' .
 784                                   '<span class="redirectText">'.$link.'</span>' );
 785
 786                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 787                                 $wgOut->addParserOutputNoText( $parseout );
 788                         } else if ( $pcache ) {
 789                                 # Display content and save to parser cache
 790                                 $wgOut->addPrimaryWikiText( $text, $this );
 791                         } else {
 792                                 # Display content, don't attempt to save to parser cache
 793                                 # Don't show section-edit links on old revisions... this way lies madness.
 794                                 if( !$this->isCurrent() ) {
 795                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 796                                 }
 797                                 # Display content and don't save to parser cache
 798                                 $wgOut->addPrimaryWikiText( $text, $this, false );
 799
 800                                 if( !$this->isCurrent() ) {
 801                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 802                                 }
 803                         }
 804                 }
 805                 /* title may have been set from the cache */
 806                 $t = $wgOut->getPageTitle();
 807                 if( empty( $t ) ) {
 808                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 809                 }
 810
 811                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 812                 if( $ns == NS_USER_TALK &&
 813                         User::isIP( $this->mTitle->getText() ) ) {
 814                         $wgOut->addWikiText( wfMsg('anontalkpagetext') );
 815                 }
 816
 817                 # If we have been passed an &rcid= parameter, we want to give the user a
 818                 # chance to mark this new article as patrolled.
 819                 if ( $wgUseRCPatrol && !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) ) {
 820                         $wgOut->addHTML(
 821                                 "<div class='patrollink'>" .
 822                                         wfMsg ( 'markaspatrolledlink',
 823                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsg('markaspatrolledtext'), "action=markpatrolled&rcid=$rcid" )
 824                                         ) .
 825                                 '</div>'
 826                          );
 827                 }
 828
 829                 # Trackbacks
 830                 if ($wgUseTrackbacks)
 831                         $this->addTrackbacks();
 832
 833                 $this->viewUpdates();
 834                 wfProfileOut( __METHOD__ );
 835         }
 836
 837         function addTrackbacks() {
 838                 global $wgOut, $wgUser;
 839
 840                 $dbr =& wfGetDB(DB_SLAVE);
 841                 $tbs = $dbr->select(
 842                                 /* FROM   */ 'trackbacks',
 843                                 /* SELECT */ array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
 844                                 /* WHERE  */ array('tb_page' => $this->getID())
 845                 );
 846
 847                 if (!$dbr->numrows($tbs))
 848                         return;
 849
 850                 $tbtext = "";
 851                 while ($o = $dbr->fetchObject($tbs)) {
 852                         $rmvtxt = "";
 853                         if ($wgUser->isAllowed( 'trackback' )) {
 854                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid="
 855                                                 . $o->tb_id . "&token=" . $wgUser->editToken());
 856                                 $rmvtxt = wfMsg('trackbackremove', $delurl);
 857                         }
 858                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
 859                                         $o->tb_title,
 860                                         $o->tb_url,
 861                                         $o->tb_ex,
 862                                         $o->tb_name,
 863                                         $rmvtxt);
 864                 }
 865                 $wgOut->addWikitext(wfMsg('trackbackbox', $tbtext));
 866         }
 867
 868         function deletetrackback() {
 869                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
 870
 871                 if (!$wgUser->matchEditToken($wgRequest->getVal('token'))) {
 872                         $wgOut->addWikitext(wfMsg('sessionfailure'));
 873                         return;
 874                 }
 875
 876                 if ((!$wgUser->isAllowed('delete'))) {
 877                         $wgOut->permissionRequired( 'delete' );
 878                         return;
 879                 }
 880
 881                 if (wfReadOnly()) {
 882                         $wgOut->readOnlyPage();
 883                         return;
 884                 }
 885
 886                 $db =& wfGetDB(DB_MASTER);
 887                 $db->delete('trackbacks', array('tb_id' => $wgRequest->getInt('tbid')));
 888                 $wgTitle->invalidateCache();
 889                 $wgOut->addWikiText(wfMsg('trackbackdeleteok'));
 890         }
 891
 892         function render() {
 893                 global $wgOut;
 894
 895                 $wgOut->setArticleBodyOnly(true);
 896                 $this->view();
 897         }
 898
 899         /**
 900          * Handle action=purge
 901          */
 902         function purge() {
 903                 global $wgUser, $wgRequest, $wgOut;
 904
 905                 if ( $wgUser->isLoggedIn() || $wgRequest->wasPosted() ) {
 906                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
 907                                 $this->doPurge();
 908                         }
 909                 } else {
 910                         $msg = $wgOut->parse( wfMsg( 'confirm_purge' ) );
 911                         $action = $this->mTitle->escapeLocalURL( 'action=purge' );
 912                         $button = htmlspecialchars( wfMsg( 'confirm_purge_button' ) );
 913                         $msg = str_replace( '$1',
 914                                 "<form method=\"post\" action=\"$action\">\n" .
 915                                 "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
 916                                 "</form>\n", $msg );
 917
 918                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 919                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 920                         $wgOut->addHTML( $msg );
 921                 }
 922         }
 923
 924         /**
 925          * Perform the actions of a page purging
 926          */
 927         function doPurge() {
 928                 global $wgUseSquid;
 929                 // Invalidate the cache
 930                 $this->mTitle->invalidateCache();
 931
 932                 if ( $wgUseSquid ) {
 933                         // Commit the transaction before the purge is sent
 934                         $dbw = wfGetDB( DB_MASTER );
 935                         $dbw->immediateCommit();
 936
 937                         // Send purge
 938                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 939                         $update->doUpdate();
 940                 }
 941                 $this->view();
 942         }
 943
 944         /**
 945          * Insert a new empty page record for this article.
 946          * This *must* be followed up by creating a revision
 947          * and running $this->updateToLatest( $rev_id );
 948          * or else the record will be left in a funky state.
 949          * Best if all done inside a transaction.
 950          *
 951          * @param Database $dbw
 952          * @param string   $restrictions
 953          * @return int     The newly created page_id key
 954          * @private
 955          */
 956         function insertOn( &$dbw, $restrictions = '' ) {
 957                 wfProfileIn( __METHOD__ );
 958
 959                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 960                 $dbw->insert( 'page', array(
 961                         'page_id'           => $page_id,
 962                         'page_namespace'    => $this->mTitle->getNamespace(),
 963                         'page_title'        => $this->mTitle->getDBkey(),
 964                         'page_counter'      => 0,
 965                         'page_restrictions' => $restrictions,
 966                         'page_is_redirect'  => 0, # Will set this shortly...
 967                         'page_is_new'       => 1,
 968                         'page_random'       => wfRandom(),
 969                         'page_touched'      => $dbw->timestamp(),
 970                         'page_latest'       => 0, # Fill this in shortly...
 971                         'page_len'          => 0, # Fill this in shortly...
 972                 ), __METHOD__ );
 973                 $newid = $dbw->insertId();
 974
 975                 $this->mTitle->resetArticleId( $newid );
 976
 977                 wfProfileOut( __METHOD__ );
 978                 return $newid;
 979         }
 980
 981         /**
 982          * Update the page record to point to a newly saved revision.
 983          *
 984          * @param Database $dbw
 985          * @param Revision $revision For ID number, and text used to set
 986                                      length and redirect status fields
 987          * @param int $lastRevision If given, will not overwrite the page field
 988          *                          when different from the currently set value.
 989          *                          Giving 0 indicates the new page flag should
 990          *                          be set on.
 991          * @param bool $lastRevIsRedirect If given, will optimize adding and
 992          *                                                      removing rows in redirect table.
 993          * @return bool true on success, false on failure
 994          * @private
 995          */
 996         function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
 997                 wfProfileIn( __METHOD__ );
 998
 999                 $text = $revision->getText();
1000                 $rt = Title::newFromRedirect( $text );
1001
1002                 $conditions = array( 'page_id' => $this->getId() );
1003                 if( !is_null( $lastRevision ) ) {
1004                         # An extra check against threads stepping on each other
1005                         $conditions['page_latest'] = $lastRevision;
1006                 }
1007
1008                 $dbw->update( 'page',
1009                         array( /* SET */
1010                                 'page_latest'      => $revision->getId(),
1011                                 'page_touched'     => $dbw->timestamp(),
1012                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1013                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1014                                 'page_len'         => strlen( $text ),
1015                         ),
1016                         $conditions,
1017                         __METHOD__ );
1018
1019                 $result = $dbw->affectedRows() != 0;
1020
1021                 if ($result) {
1022                         // FIXME: Should the result from updateRedirectOn() be returned instead?
1023                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1024                 }
1025
1026                 wfProfileOut( __METHOD__ );
1027                 return $result;
1028         }
1029
1030         /**
1031          * Add row to the redirect table if this is a redirect, remove otherwise.
1032          *
1033          * @param Database $dbw
1034          * @param $redirectTitle a title object pointing to the redirect target,
1035          *                                                      or NULL if this is not a redirect
1036          * @param bool $lastRevIsRedirect If given, will optimize adding and
1037          *                                                      removing rows in redirect table.
1038          * @return bool true on success, false on failure
1039          * @private
1040          */
1041         function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1042
1043                 // Always update redirects (target link might have changed)
1044                 // Update/Insert if we don't know if the last revision was a redirect or not
1045                 // Delete if changing from redirect to non-redirect
1046                 $isRedirect = !is_null($redirectTitle);
1047                 if ($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1048
1049                         wfProfileIn( __METHOD__ );
1050
1051                         if ($isRedirect) {
1052
1053                                 // This title is a redirect, Add/Update row in the redirect table
1054                                 $set = array( /* SET */
1055                                         'rd_namespace' => $redirectTitle->getNamespace(),
1056                                         'rd_title'     => $redirectTitle->getDBkey(),
1057                                         'rd_from'      => $this->getId(),
1058                                 );
1059
1060                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1061                         } else {
1062                                 // This is not a redirect, remove row from redirect table
1063                                 $where = array( 'rd_from' => $this->getId() );
1064                                 $dbw->delete( 'redirect', $where, __METHOD__);
1065                         }
1066
1067                         wfProfileOut( __METHOD__ );
1068                         return ( $dbw->affectedRows() != 0 );
1069                 }
1070
1071                 return true;
1072         }
1073
1074         /**
1075          * If the given revision is newer than the currently set page_latest,
1076          * update the page record. Otherwise, do nothing.
1077          *
1078          * @param Database $dbw
1079          * @param Revision $revision
1080          */
1081         function updateIfNewerOn( &$dbw, $revision ) {
1082                 wfProfileIn( __METHOD__ );
1083
1084                 $row = $dbw->selectRow(
1085                         array( 'revision', 'page' ),
1086                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1087                         array(
1088                                 'page_id' => $this->getId(),
1089                                 'page_latest=rev_id' ),
1090                         __METHOD__ );
1091                 if( $row ) {
1092                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1093                                 wfProfileOut( __METHOD__ );
1094                                 return false;
1095                         }
1096                         $prev = $row->rev_id;
1097                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1098                 } else {
1099                         # No or missing previous revision; mark the page as new
1100                         $prev = 0;
1101                         $lastRevIsRedirect = null;
1102                 }
1103
1104                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1105                 wfProfileOut( __METHOD__ );
1106                 return $ret;
1107         }
1108
1109         /**
1110          * @return string Complete article text, or null if error
1111          */
1112         function replaceSection($section, $text, $summary = '', $edittime = NULL) {
1113                 wfProfileIn( __METHOD__ );
1114
1115                 if( $section == '' ) {
1116                         // Whole-page edit; let the text through unmolested.
1117                 } else {
1118                         if( is_null( $edittime ) ) {
1119                                 $rev = Revision::newFromTitle( $this->mTitle );
1120                         } else {
1121                                 $dbw =& wfGetDB( DB_MASTER );
1122                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1123                         }
1124                         if( is_null( $rev ) ) {
1125                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1126                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1127                                 return null;
1128                         }
1129                         $oldtext = $rev->getText();
1130
1131                         if($section=='new') {
1132                                 if($summary) $subject="== {$summary} ==\n\n";
1133                                 $text=$oldtext."\n\n".$subject.$text;
1134                         } else {
1135                                 global $wgParser;
1136                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1137                         }
1138                 }
1139
1140                 wfProfileOut( __METHOD__ );
1141                 return $text;
1142         }
1143
1144         /**
1145          * @deprecated use Article::doEdit()
1146          */
1147         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false ) {
1148                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1149                         ( $isminor ? EDIT_MINOR : 0 ) |
1150                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 );
1151
1152                 # If this is a comment, add the summary as headline
1153                 if ( $comment && $summary != "" ) {
1154                         $text = "== {$summary} ==\n\n".$text;
1155                 }
1156
1157                 $this->doEdit( $text, $summary, $flags );
1158
1159                 $dbw =& wfGetDB( DB_MASTER );
1160                 if ($watchthis) {
1161                         if (!$this->mTitle->userIsWatching()) {
1162                                 $dbw->begin();
1163                                 $this->doWatch();
1164                                 $dbw->commit();
1165                         }
1166                 } else {
1167                         if ( $this->mTitle->userIsWatching() ) {
1168                                 $dbw->begin();
1169                                 $this->doUnwatch();
1170                                 $dbw->commit();
1171                         }
1172                 }
1173                 $this->doRedirect( $this->isRedirect( $text ) );
1174         }
1175
1176         /**
1177          * @deprecated use Article::doEdit()
1178          */
1179         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1180                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1181                         ( $minor ? EDIT_MINOR : 0 ) |
1182                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1183
1184                 $good = $this->doEdit( $text, $summary, $flags );
1185                 if ( $good ) {
1186                         $dbw =& wfGetDB( DB_MASTER );
1187                         if ($watchthis) {
1188                                 if (!$this->mTitle->userIsWatching()) {
1189                                         $dbw->begin();
1190                                         $this->doWatch();
1191                                         $dbw->commit();
1192                                 }
1193                         } else {
1194                                 if ( $this->mTitle->userIsWatching() ) {
1195                                         $dbw->begin();
1196                                         $this->doUnwatch();
1197                                         $dbw->commit();
1198                                 }
1199                         }
1200
1201                         $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1202                 }
1203                 return $good;
1204         }
1205
1206         /**
1207          * Article::doEdit()
1208          *
1209          * Change an existing article or create a new article. Updates RC and all necessary caches,
1210          * optionally via the deferred update array.
1211          *
1212          * $wgUser must be set before calling this function.
1213          *
1214          * @param string $text New text
1215          * @param string $summary Edit summary
1216          * @param integer $flags bitfield:
1217          *      EDIT_NEW
1218          *          Article is known or assumed to be non-existent, create a new one
1219          *      EDIT_UPDATE
1220          *          Article is known or assumed to be pre-existing, update it
1221          *      EDIT_MINOR
1222          *          Mark this edit minor, if the user is allowed to do so
1223          *      EDIT_SUPPRESS_RC
1224          *          Do not log the change in recentchanges
1225          *      EDIT_FORCE_BOT
1226          *          Mark the edit a "bot" edit regardless of user rights
1227          *      EDIT_DEFER_UPDATES
1228          *          Defer some of the updates until the end of index.php
1229          *      EDIT_AUTOSUMMARY
1230          *          Fill in blank summaries with generated text where possible
1231          *
1232          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1233          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return false. If
1234          * EDIT_NEW is specified and the article does exist, a duplicate key error will cause an exception
1235          * to be thrown from the Database. These two conditions are also possible with auto-detection due
1236          * to MediaWiki's performance-optimised locking strategy.
1237          *
1238          * @return bool success
1239          */
1240         function doEdit( $text, $summary, $flags = 0 ) {
1241                 global $wgUser, $wgDBtransactions;
1242
1243                 wfProfileIn( __METHOD__ );
1244                 $good = true;
1245
1246                 if ( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1247                         $aid = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
1248                         if ( $aid ) {
1249                                 $flags |= EDIT_UPDATE;
1250                         } else {
1251                                 $flags |= EDIT_NEW;
1252                         }
1253                 }
1254
1255                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1256                         &$summary, $flags & EDIT_MINOR,
1257                         null, null, &$flags ) ) )
1258                 {
1259                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1260                         wfProfileOut( __METHOD__ );
1261                         return false;
1262                 }
1263
1264                 # Silently ignore EDIT_MINOR if not allowed
1265                 $isminor = ( $flags & EDIT_MINOR ) && $wgUser->isAllowed('minoredit');
1266                 $bot = $wgUser->isAllowed( 'bot' ) || ( $flags & EDIT_FORCE_BOT );
1267
1268                 $oldtext = $this->getContent();
1269                 $oldsize = strlen( $oldtext );
1270                 $newsize = strlen( $text );
1271
1272                 # Provide autosummaries if one is not provided.
1273                 if ($flags & EDIT_AUTOSUMMARY && $summary == '')
1274                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1275
1276                 $text = $this->preSaveTransform( $text );
1277
1278                 $dbw =& wfGetDB( DB_MASTER );
1279                 $now = wfTimestampNow();
1280
1281                 if ( $flags & EDIT_UPDATE ) {
1282                         # Update article, but only if changed.
1283
1284                         # Make sure the revision is either completely inserted or not inserted at all
1285                         if( !$wgDBtransactions ) {
1286                                 $userAbort = ignore_user_abort( true );
1287                         }
1288
1289                         $lastRevision = 0;
1290                         $revisionId = 0;
1291
1292                         if ( 0 != strcmp( $text, $oldtext ) ) {
1293                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1294                                   - (int)$this->isCountable( $oldtext );
1295                                 $this->mTotalAdjustment = 0;
1296
1297                                 $lastRevision = $dbw->selectField(
1298                                         'page', 'page_latest', array( 'page_id' => $this->getId() ) );
1299
1300                                 if ( !$lastRevision ) {
1301                                         # Article gone missing
1302                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1303                                         wfProfileOut( __METHOD__ );
1304                                         return false;
1305                                 }
1306
1307                                 $revision = new Revision( array(
1308                                         'page'       => $this->getId(),
1309                                         'comment'    => $summary,
1310                                         'minor_edit' => $isminor,
1311                                         'text'       => $text
1312                                         ) );
1313
1314                                 $dbw->begin();
1315                                 $revisionId = $revision->insertOn( $dbw );
1316
1317                                 # Update page
1318                                 $ok = $this->updateRevisionOn( $dbw, $revision, $lastRevision );
1319
1320                                 if( !$ok ) {
1321                                         /* Belated edit conflict! Run away!! */
1322                                         $good = false;
1323                                         $dbw->rollback();
1324                                 } else {
1325                                         # Update recentchanges
1326                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1327                                                 $rcid = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $wgUser, $summary,
1328                                                         $lastRevision, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1329                                                         $revisionId );
1330
1331                                                 # Mark as patrolled if the user can do so and has it set in their options
1332                                                 if( $wgUser->isAllowed( 'patrol' ) && $wgUser->getOption( 'autopatrol' ) ) {
1333                                                         RecentChange::markPatrolled( $rcid );
1334                                                 }
1335                                         }
1336                                         $dbw->commit();
1337                                 }
1338                         } else {
1339                                 // Keep the same revision ID, but do some updates on it
1340                                 $revisionId = $this->getRevIdFetched();
1341                                 // Update page_touched, this is usually implicit in the page update
1342                                 // Other cache updates are done in onArticleEdit()
1343                                 $this->mTitle->invalidateCache();
1344                         }
1345
1346                         if( !$wgDBtransactions ) {
1347                                 ignore_user_abort( $userAbort );
1348                         }
1349
1350                         if ( $good ) {
1351                                 # Invalidate cache of this article and all pages using this article
1352                                 # as a template. Partly deferred.
1353                                 Article::onArticleEdit( $this->mTitle );
1354
1355                                 # Update links tables, site stats, etc.
1356                                 $changed = ( strcmp( $oldtext, $text ) != 0 );
1357                                 $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1358                         }
1359                 } else {
1360                         # Create new article
1361
1362                         # Set statistics members
1363                         # We work out if it's countable after PST to avoid counter drift
1364                         # when articles are created with {{subst:}}
1365                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1366                         $this->mTotalAdjustment = 1;
1367
1368                         $dbw->begin();
1369
1370                         # Add the page record; stake our claim on this title!
1371                         # This will fail with a database query exception if the article already exists
1372                         $newid = $this->insertOn( $dbw );
1373
1374                         # Save the revision text...
1375                         $revision = new Revision( array(
1376                                 'page'       => $newid,
1377                                 'comment'    => $summary,
1378                                 'minor_edit' => $isminor,
1379                                 'text'       => $text
1380                                 ) );
1381                         $revisionId = $revision->insertOn( $dbw );
1382
1383                         $this->mTitle->resetArticleID( $newid );
1384
1385                         # Update the page record with revision data
1386                         $this->updateRevisionOn( $dbw, $revision, 0 );
1387
1388                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1389                                 $rcid = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary, $bot,
1390                                   '', strlen( $text ), $revisionId );
1391                                 # Mark as patrolled if the user can and has the option set
1392                                 if( $wgUser->isAllowed( 'patrol' ) && $wgUser->getOption( 'autopatrol' ) ) {
1393                                         RecentChange::markPatrolled( $rcid );
1394                                 }
1395                         }
1396                         $dbw->commit();
1397
1398                         # Update links, etc.
1399                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1400
1401                         # Clear caches
1402                         Article::onArticleCreate( $this->mTitle );
1403
1404                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$wgUser, $text,
1405                                 $summary, $flags & EDIT_MINOR,
1406                                 null, null, &$flags ) );
1407                 }
1408
1409                 if ( $good && !( $flags & EDIT_DEFER_UPDATES ) ) {
1410                         wfDoUpdates();
1411                 }
1412
1413                 wfRunHooks( 'ArticleSaveComplete',
1414                         array( &$this, &$wgUser, $text,
1415                         $summary, $flags & EDIT_MINOR,
1416                         null, null, &$flags ) );
1417
1418                 wfProfileOut( __METHOD__ );
1419                 return $good;
1420         }
1421
1422         /**
1423          * @deprecated wrapper for doRedirect
1424          */
1425         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1426                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1427         }
1428
1429         /**
1430          * Output a redirect back to the article.
1431          * This is typically used after an edit.
1432          *
1433          * @param boolean $noRedir Add redirect=no
1434          * @param string $sectionAnchor section to redirect to, including "#"
1435          */
1436         function doRedirect( $noRedir = false, $sectionAnchor = '' ) {
1437                 global $wgOut;
1438                 if ( $noRedir ) {
1439                         $query = 'redirect=no';
1440                 } else {
1441                         $query = '';
1442                 }
1443                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1444         }
1445
1446         /**
1447          * Mark this particular edit as patrolled
1448          */
1449         function markpatrolled() {
1450                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUser;
1451                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1452
1453                 # Check RC patrol config. option
1454                 if( !$wgUseRCPatrol ) {
1455                         $wgOut->errorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1456                         return;
1457                 }
1458
1459                 # Check permissions
1460                 if( !$wgUser->isAllowed( 'patrol' ) ) {
1461                         $wgOut->permissionRequired( 'patrol' );
1462                         return;
1463                 }
1464
1465                 $rcid = $wgRequest->getVal( 'rcid' );
1466                 if ( !is_null ( $rcid ) ) {
1467                         if( wfRunHooks( 'MarkPatrolled', array( &$rcid, &$wgUser, false ) ) ) {
1468                                 RecentChange::markPatrolled( $rcid );
1469                                 wfRunHooks( 'MarkPatrolledComplete', array( &$rcid, &$wgUser, false ) );
1470                                 $wgOut->setPagetitle( wfMsg( 'markedaspatrolled' ) );
1471                                 $wgOut->addWikiText( wfMsg( 'markedaspatrolledtext' ) );
1472                         }
1473                         $rcTitle = SpecialPage::getTitleFor( 'Recentchanges' );
1474                         $wgOut->returnToMain( false, $rcTitle->getPrefixedText() );
1475                 }
1476                 else {
1477                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1478                 }
1479         }
1480
1481         /**
1482          * User-interface handler for the "watch" action
1483          */
1484
1485         function watch() {
1486
1487                 global $wgUser, $wgOut;
1488
1489                 if ( $wgUser->isAnon() ) {
1490                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1491                         return;
1492                 }
1493                 if ( wfReadOnly() ) {
1494                         $wgOut->readOnlyPage();
1495                         return;
1496                 }
1497
1498                 if( $this->doWatch() ) {
1499                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1500                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1501
1502                         $link = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
1503                         $text = wfMsg( 'addedwatchtext', $link );
1504                         $wgOut->addWikiText( $text );
1505                 }
1506
1507                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1508         }
1509
1510         /**
1511          * Add this page to $wgUser's watchlist
1512          * @return bool true on successful watch operation
1513          */
1514         function doWatch() {
1515                 global $wgUser;
1516                 if( $wgUser->isAnon() ) {
1517                         return false;
1518                 }
1519
1520                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1521                         $wgUser->addWatch( $this->mTitle );
1522
1523                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1524                 }
1525
1526                 return false;
1527         }
1528
1529         /**
1530          * User interface handler for the "unwatch" action.
1531          */
1532         function unwatch() {
1533
1534                 global $wgUser, $wgOut;
1535
1536                 if ( $wgUser->isAnon() ) {
1537                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1538                         return;
1539                 }
1540                 if ( wfReadOnly() ) {
1541                         $wgOut->readOnlyPage();
1542                         return;
1543                 }
1544
1545                 if( $this->doUnwatch() ) {
1546                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1547                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1548
1549                         $link = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
1550                         $text = wfMsg( 'removedwatchtext', $link );
1551                         $wgOut->addWikiText( $text );
1552                 }
1553
1554                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1555         }
1556
1557         /**
1558          * Stop watching a page
1559          * @return bool true on successful unwatch
1560          */
1561         function doUnwatch() {
1562                 global $wgUser;
1563                 if( $wgUser->isAnon() ) {
1564                         return false;
1565                 }
1566
1567                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1568                         $wgUser->removeWatch( $this->mTitle );
1569
1570                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1571                 }
1572
1573                 return false;
1574         }
1575
1576         /**
1577          * action=protect handler
1578          */
1579         function protect() {
1580                 $form = new ProtectionForm( $this );
1581                 $form->show();
1582         }
1583
1584         /**
1585          * action=unprotect handler (alias)
1586          */
1587         function unprotect() {
1588                 $this->protect();
1589         }
1590
1591         /**
1592          * Update the article's restriction field, and leave a log entry.
1593          *
1594          * @param array $limit set of restriction keys
1595          * @param string $reason
1596          * @return bool true on success
1597          */
1598         function updateRestrictions( $limit = array(), $reason = '' ) {
1599                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1600
1601                 $id = $this->mTitle->getArticleID();
1602                 if( !$wgUser->isAllowed( 'protect' ) || wfReadOnly() || $id == 0 ) {
1603                         return false;
1604                 }
1605
1606                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1607                 # we expect a single selection, but the schema allows otherwise.
1608                 $current = array();
1609                 foreach( $wgRestrictionTypes as $action )
1610                         $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1611
1612                 $current = Article::flattenRestrictions( $current );
1613                 $updated = Article::flattenRestrictions( $limit );
1614
1615                 $changed = ( $current != $updated );
1616                 $protect = ( $updated != '' );
1617
1618                 # If nothing's changed, do nothing
1619                 if( $changed ) {
1620                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1621
1622                                 $dbw =& wfGetDB( DB_MASTER );
1623
1624                                 # Prepare a null revision to be added to the history
1625                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $protect ? 'protectedarticle' : 'unprotectedarticle', $this->mTitle->getPrefixedText() ) );
1626                                 if( $reason )
1627                                         $comment .= ": $reason";
1628                                 if( $protect )
1629                                         $comment .= " [$updated]";
1630                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $comment, true );
1631                                 $nullRevId = $nullRevision->insertOn( $dbw );
1632
1633                                 # Update page record
1634                                 $dbw->update( 'page',
1635                                         array( /* SET */
1636                                                 'page_touched' => $dbw->timestamp(),
1637                                                 'page_restrictions' => $updated,
1638                                                 'page_latest' => $nullRevId
1639                                         ), array( /* WHERE */
1640                                                 'page_id' => $id
1641                                         ), 'Article::protect'
1642                                 );
1643                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1644
1645                                 # Update the protection log
1646                                 $log = new LogPage( 'protect' );
1647                                 if( $protect ) {
1648                                         $log->addEntry( 'protect', $this->mTitle, trim( $reason . " [$updated]" ) );
1649                                 } else {
1650                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1651                                 }
1652
1653                         } # End hook
1654                 } # End "changed" check
1655
1656                 return true;
1657         }
1658
1659         /**
1660          * Take an array of page restrictions and flatten it to a string
1661          * suitable for insertion into the page_restrictions field.
1662          * @param array $limit
1663          * @return string
1664          * @private
1665          */
1666         function flattenRestrictions( $limit ) {
1667                 if( !is_array( $limit ) ) {
1668                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
1669                 }
1670                 $bits = array();
1671                 ksort( $limit );
1672                 foreach( $limit as $action => $restrictions ) {
1673                         if( $restrictions != '' ) {
1674                                 $bits[] = "$action=$restrictions";
1675                         }
1676                 }
1677                 return implode( ':', $bits );
1678         }
1679
1680         /*
1681          * UI entry point for page deletion
1682          */
1683         function delete() {
1684                 global $wgUser, $wgOut, $wgRequest;
1685                 $confirm = $wgRequest->wasPosted() &&
1686                         $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1687                 $reason = $wgRequest->getText( 'wpReason' );
1688
1689                 # This code desperately needs to be totally rewritten
1690
1691                 # Check permissions
1692                 if( $wgUser->isAllowed( 'delete' ) ) {
1693                         if( $wgUser->isBlocked( !$confirm ) ) {
1694                                 $wgOut->blockedPage();
1695                                 return;
1696                         }
1697                 } else {
1698                         $wgOut->permissionRequired( 'delete' );
1699                         return;
1700                 }
1701
1702                 if( wfReadOnly() ) {
1703                         $wgOut->readOnlyPage();
1704                         return;
1705                 }
1706
1707                 $wgOut->setPagetitle( wfMsg( 'confirmdelete' ) );
1708
1709                 # Better double-check that it hasn't been deleted yet!
1710                 $dbw =& wfGetDB( DB_MASTER );
1711                 $conds = $this->mTitle->pageCond();
1712                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
1713                 if ( $latest === false ) {
1714                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
1715                         return;
1716                 }
1717
1718                 if( $confirm ) {
1719                         $this->doDelete( $reason );
1720                         return;
1721                 }
1722
1723                 # determine whether this page has earlier revisions
1724                 # and insert a warning if it does
1725                 $maxRevisions = 20;
1726                 $authors = $this->getLastNAuthors( $maxRevisions, $latest );
1727
1728                 if( count( $authors ) > 1 && !$confirm ) {
1729                         $skin=$wgUser->getSkin();
1730                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
1731                 }
1732
1733                 # If a single user is responsible for all revisions, find out who they are
1734                 if ( count( $authors ) == $maxRevisions ) {
1735                         // Query bailed out, too many revisions to find out if they're all the same
1736                         $authorOfAll = false;
1737                 } else {
1738                         $authorOfAll = reset( $authors );
1739                         foreach ( $authors as $author ) {
1740                                 if ( $authorOfAll != $author ) {
1741                                         $authorOfAll = false;
1742                                         break;
1743                                 }
1744                         }
1745                 }
1746                 # Fetch article text
1747                 $rev = Revision::newFromTitle( $this->mTitle );
1748
1749                 if( !is_null( $rev ) ) {
1750                         # if this is a mini-text, we can paste part of it into the deletion reason
1751                         $text = $rev->getText();
1752
1753                         #if this is empty, an earlier revision may contain "useful" text
1754                         $blanked = false;
1755                         if( $text == '' ) {
1756                                 $prev = $rev->getPrevious();
1757                                 if( $prev ) {
1758                                         $text = $prev->getText();
1759                                         $blanked = true;
1760                                 }
1761                         }
1762
1763                         $length = strlen( $text );
1764
1765                         # this should not happen, since it is not possible to store an empty, new
1766                         # page. Let's insert a standard text in case it does, though
1767                         if( $length == 0 && $reason === '' ) {
1768                                 $reason = wfMsgForContent( 'exblank' );
1769                         }
1770
1771                         if( $length < 500 && $reason === '' ) {
1772                                 # comment field=255, let's grep the first 150 to have some user
1773                                 # space left
1774                                 global $wgContLang;
1775                                 $text = $wgContLang->truncate( $text, 150, '...' );
1776
1777                                 # let's strip out newlines
1778                                 $text = preg_replace( "/[\n\r]/", '', $text );
1779
1780                                 if( !$blanked ) {
1781                                         if( $authorOfAll === false ) {
1782                                                 $reason = wfMsgForContent( 'excontent', $text );
1783                                         } else {
1784                                                 $reason = wfMsgForContent( 'excontentauthor', $text, $authorOfAll );
1785                                         }
1786                                 } else {
1787                                         $reason = wfMsgForContent( 'exbeforeblank', $text );
1788                                 }
1789                         }
1790                 }
1791
1792                 return $this->confirmDelete( '', $reason );
1793         }
1794
1795         /**
1796          * Get the last N authors
1797          * @param int $num Number of revisions to get
1798          * @param string $revLatest The latest rev_id, selected from the master (optional)
1799          * @return array Array of authors, duplicates not removed
1800          */
1801         function getLastNAuthors( $num, $revLatest = 0 ) {
1802                 wfProfileIn( __METHOD__ );
1803
1804                 // First try the slave
1805                 // If that doesn't have the latest revision, try the master
1806                 $continue = 2;
1807                 $db =& wfGetDB( DB_SLAVE );
1808                 do {
1809                         $res = $db->select( array( 'page', 'revision' ),
1810                                 array( 'rev_id', 'rev_user_text' ),
1811                                 array(
1812                                         'page_namespace' => $this->mTitle->getNamespace(),
1813                                         'page_title' => $this->mTitle->getDBkey(),
1814                                         'rev_page = page_id'
1815                                 ), __METHOD__, $this->getSelectOptions( array(
1816                                         'ORDER BY' => 'rev_timestamp DESC',
1817                                         'LIMIT' => $num
1818                                 ) )
1819                         );
1820                         if ( !$res ) {
1821                                 wfProfileOut( __METHOD__ );
1822                                 return array();
1823                         }
1824                         $row = $db->fetchObject( $res );
1825                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1826                                 $db =& wfGetDB( DB_MASTER );
1827                                 $continue--;
1828                         } else {
1829                                 $continue = 0;
1830                         }
1831                 } while ( $continue );
1832
1833                 $authors = array( $row->rev_user_text );
1834                 while ( $row = $db->fetchObject( $res ) ) {
1835                         $authors[] = $row->rev_user_text;
1836                 }
1837                 wfProfileOut( __METHOD__ );
1838                 return $authors;
1839         }
1840
1841         /**
1842          * Output deletion confirmation dialog
1843          */
1844         function confirmDelete( $par, $reason ) {
1845                 global $wgOut, $wgUser;
1846
1847                 wfDebug( "Article::confirmDelete\n" );
1848
1849                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
1850                 $wgOut->setSubtitle( wfMsg( 'deletesub', $sub ) );
1851                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1852                 $wgOut->addWikiText( wfMsg( 'confirmdeletetext' ) );
1853
1854                 $formaction = $this->mTitle->escapeLocalURL( 'action=delete' . $par );
1855
1856                 $confirm = htmlspecialchars( wfMsg( 'deletepage' ) );
1857                 $delcom = htmlspecialchars( wfMsg( 'deletecomment' ) );
1858                 $token = htmlspecialchars( $wgUser->editToken() );
1859
1860                 $wgOut->addHTML( "
1861 <form id='deleteconfirm' method='post' action=\"{$formaction}\">
1862         <table border='0'>
1863                 <tr>
1864                         <td align='right'>
1865                                 <label for='wpReason'>{$delcom}:</label>
1866                         </td>
1867                         <td align='left'>
1868                                 <input type='text' size='60' name='wpReason' id='wpReason' value=\"" . htmlspecialchars( $reason ) . "\" />
1869                         </td>
1870                 </tr>
1871                 <tr>
1872                         <td>&nbsp;</td>
1873                         <td>
1874                                 <input type='submit' name='wpConfirmB' id='wpConfirmB' value=\"{$confirm}\" />
1875                         </td>
1876                 </tr>
1877         </table>
1878         <input type='hidden' name='wpEditToken' value=\"{$token}\" />
1879 </form>\n" );
1880
1881                 $wgOut->returnToMain( false );
1882         }
1883
1884
1885         /**
1886          * Perform a deletion and output success or failure messages
1887          */
1888         function doDelete( $reason ) {
1889                 global $wgOut, $wgUser;
1890                 wfDebug( __METHOD__."\n" );
1891
1892                 if (wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason))) {
1893                         if ( $this->doDeleteArticle( $reason ) ) {
1894                                 $deleted = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
1895
1896                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
1897                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1898
1899                                 $loglink = '[[Special:Log/delete|' . wfMsg( 'deletionlog' ) . ']]';
1900                                 $text = wfMsg( 'deletedtext', $deleted, $loglink );
1901
1902                                 $wgOut->addWikiText( $text );
1903                                 $wgOut->returnToMain( false );
1904                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason));
1905                         } else {
1906                                 $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
1907                         }
1908                 }
1909         }
1910
1911         /**
1912          * Back-end article deletion
1913          * Deletes the article with database consistency, writes logs, purges caches
1914          * Returns success
1915          */
1916         function doDeleteArticle( $reason ) {
1917                 global $wgUseSquid, $wgDeferredUpdateList;
1918                 global $wgUseTrackbacks;
1919
1920                 wfDebug( __METHOD__."\n" );
1921
1922                 $dbw =& wfGetDB( DB_MASTER );
1923                 $ns = $this->mTitle->getNamespace();
1924                 $t = $this->mTitle->getDBkey();
1925                 $id = $this->mTitle->getArticleID();
1926
1927                 if ( $t == '' || $id == 0 ) {
1928                         return false;
1929                 }
1930
1931                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
1932                 array_push( $wgDeferredUpdateList, $u );
1933
1934                 // For now, shunt the revision data into the archive table.
1935                 // Text is *not* removed from the text table; bulk storage
1936                 // is left intact to avoid breaking block-compression or
1937                 // immutable storage schemes.
1938                 //
1939                 // For backwards compatibility, note that some older archive
1940                 // table entries will have ar_text and ar_flags fields still.
1941                 //
1942                 // In the future, we may keep revisions and mark them with
1943                 // the rev_deleted field, which is reserved for this purpose.
1944                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
1945                         array(
1946                                 'ar_namespace'  => 'page_namespace',
1947                                 'ar_title'      => 'page_title',
1948                                 'ar_comment'    => 'rev_comment',
1949                                 'ar_user'       => 'rev_user',
1950                                 'ar_user_text'  => 'rev_user_text',
1951                                 'ar_timestamp'  => 'rev_timestamp',
1952                                 'ar_minor_edit' => 'rev_minor_edit',
1953                                 'ar_rev_id'     => 'rev_id',
1954                                 'ar_text_id'    => 'rev_text_id',
1955                         ), array(
1956                                 'page_id' => $id,
1957                                 'page_id = rev_page'
1958                         ), __METHOD__
1959                 );
1960
1961                 # Now that it's safely backed up, delete it
1962                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
1963
1964                 # If using cascading deletes, we can skip some explicit deletes
1965                 if ( !$dbw->cascadingDeletes() ) {
1966
1967                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
1968
1969                         if ($wgUseTrackbacks)
1970                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
1971
1972                         # Delete outgoing links
1973                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
1974                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
1975                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
1976                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
1977                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
1978                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
1979                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
1980                 }
1981
1982                 # If using cleanup triggers, we can skip some manual deletes
1983                 if ( !$dbw->cleanupTriggers() ) {
1984
1985                         # Clean up recentchanges entries...
1986                         $dbw->delete( 'recentchanges', array( 'rc_namespace' => $ns, 'rc_title' => $t ), __METHOD__ );
1987                 }
1988
1989                 # Clear caches
1990                 Article::onArticleDelete( $this->mTitle );
1991
1992                 # Log the deletion
1993                 $log = new LogPage( 'delete' );
1994                 $log->addEntry( 'delete', $this->mTitle, $reason );
1995
1996                 # Clear the cached article id so the interface doesn't act like we exist
1997                 $this->mTitle->resetArticleID( 0 );
1998                 $this->mTitle->mArticleID = 0;
1999                 return true;
2000         }
2001
2002         /**
2003          * Revert a modification
2004          */
2005         function rollback() {
2006                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2007
2008                 if( $wgUser->isAllowed( 'rollback' ) ) {
2009                         if( $wgUser->isBlocked() ) {
2010                                 $wgOut->blockedPage();
2011                                 return;
2012                         }
2013                 } else {
2014                         $wgOut->permissionRequired( 'rollback' );
2015                         return;
2016                 }
2017
2018                 if ( wfReadOnly() ) {
2019                         $wgOut->readOnlyPage( $this->getContent() );
2020                         return;
2021                 }
2022                 if( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ),
2023                         array( $this->mTitle->getPrefixedText(),
2024                                 $wgRequest->getVal( 'from' ) )  ) ) {
2025                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2026                         $wgOut->addWikiText( wfMsg( 'sessionfailure' ) );
2027                         return;
2028                 }
2029                 $dbw =& wfGetDB( DB_MASTER );
2030
2031                 # Enhanced rollback, marks edits rc_bot=1
2032                 $bot = $wgRequest->getBool( 'bot' );
2033
2034                 # Replace all this user's current edits with the next one down
2035
2036                 # Get the last editor
2037                 $current = Revision::newFromTitle( $this->mTitle );
2038                 if( is_null( $current ) ) {
2039                         # Something wrong... no page?
2040                         $wgOut->addHTML( wfMsg( 'notanarticle' ) );
2041                         return;
2042                 }
2043
2044                 $from = str_replace( '_', ' ', $wgRequest->getVal( 'from' ) );
2045                 if( $from != $current->getUserText() ) {
2046                         $wgOut->setPageTitle( wfMsg('rollbackfailed') );
2047                         $wgOut->addWikiText( wfMsg( 'alreadyrolled',
2048                                 htmlspecialchars( $this->mTitle->getPrefixedText()),
2049                                 htmlspecialchars( $from ),
2050                                 htmlspecialchars( $current->getUserText() ) ) );
2051                         if( $current->getComment() != '') {
2052                                 $wgOut->addHTML(
2053                                         wfMsg( 'editcomment',
2054                                         htmlspecialchars( $current->getComment() ) ) );
2055                         }
2056                         return;
2057                 }
2058
2059                 # Get the last edit not by this guy
2060                 $user = intval( $current->getUser() );
2061                 $user_text = $dbw->addQuotes( $current->getUserText() );
2062                 $s = $dbw->selectRow( 'revision',
2063                         array( 'rev_id', 'rev_timestamp' ),
2064                         array(
2065                                 'rev_page' => $current->getPage(),
2066                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
2067                         ), __METHOD__,
2068                         array(
2069                                 'USE INDEX' => 'page_timestamp',
2070                                 'ORDER BY'  => 'rev_timestamp DESC' )
2071                         );
2072                 if( $s === false ) {
2073                         # Something wrong
2074                         $wgOut->setPageTitle(wfMsg('rollbackfailed'));
2075                         $wgOut->addHTML( wfMsg( 'cantrollback' ) );
2076                         return;
2077                 }
2078
2079                 $set = array();
2080                 if ( $bot ) {
2081                         # Mark all reverted edits as bot
2082                         $set['rc_bot'] = 1;
2083                 }
2084                 if ( $wgUseRCPatrol ) {
2085                         # Mark all reverted edits as patrolled
2086                         $set['rc_patrolled'] = 1;
2087                 }
2088
2089                 if ( $set ) {
2090                         $dbw->update( 'recentchanges', $set,
2091                                 array( /* WHERE */
2092                                         'rc_cur_id'    => $current->getPage(),
2093                                         'rc_user_text' => $current->getUserText(),
2094                                         "rc_timestamp > '{$s->rev_timestamp}'",
2095                                 ), __METHOD__
2096                         );
2097                 }
2098
2099                 # Get the edit summary
2100                 $target = Revision::newFromId( $s->rev_id );
2101                 $newComment = wfMsgForContent( 'revertpage', $target->getUserText(), $from );
2102                 $newComment = $wgRequest->getText( 'summary', $newComment );
2103
2104                 # Save it!
2105                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2106                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2107                 $wgOut->addHTML( '<h2>' . htmlspecialchars( $newComment ) . "</h2>\n<hr />\n" );
2108
2109                 $this->updateArticle( $target->getText(), $newComment, 1, $this->mTitle->userIsWatching(), $bot );
2110
2111                 $wgOut->returnToMain( false );
2112         }
2113
2114
2115         /**
2116          * Do standard deferred updates after page view
2117          * @private
2118          */
2119         function viewUpdates() {
2120                 global $wgDeferredUpdateList;
2121
2122                 if ( 0 != $this->getID() ) {
2123                         global $wgDisableCounters;
2124                         if( !$wgDisableCounters ) {
2125                                 Article::incViewCount( $this->getID() );
2126                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2127                                 array_push( $wgDeferredUpdateList, $u );
2128                         }
2129                 }
2130
2131                 # Update newtalk / watchlist notification status
2132                 global $wgUser;
2133                 $wgUser->clearNotification( $this->mTitle );
2134         }
2135
2136         /**
2137          * Do standard deferred updates after page edit.
2138          * Update links tables, site stats, search index and message cache.
2139          * Every 1000th edit, prune the recent changes table.
2140          *
2141          * @private
2142          * @param $text New text of the article
2143          * @param $summary Edit summary
2144          * @param $minoredit Minor edit
2145          * @param $timestamp_of_pagechange Timestamp associated with the page change
2146          * @param $newid rev_id value of the new revision
2147          * @param $changed Whether or not the content actually changed
2148          */
2149         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2150                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser;
2151
2152                 wfProfileIn( __METHOD__ );
2153
2154                 # Parse the text
2155                 $options = new ParserOptions;
2156                 $options->setTidy(true);
2157                 $poutput = $wgParser->parse( $text, $this->mTitle, $options, true, true, $newid );
2158
2159                 # Save it to the parser cache
2160                 $parserCache =& ParserCache::singleton();
2161                 $parserCache->save( $poutput, $this, $wgUser );
2162
2163                 # Update the links tables
2164                 $u = new LinksUpdate( $this->mTitle, $poutput );
2165                 $u->doUpdate();
2166
2167                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2168                         wfSeedRandom();
2169                         if ( 0 == mt_rand( 0, 999 ) ) {
2170                                 # Periodically flush old entries from the recentchanges table.
2171                                 global $wgRCMaxAge;
2172
2173                                 $dbw =& wfGetDB( DB_MASTER );
2174                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2175                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2176                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2177                                 $dbw->query( $sql );
2178                         }
2179                 }
2180
2181                 $id = $this->getID();
2182                 $title = $this->mTitle->getPrefixedDBkey();
2183                 $shortTitle = $this->mTitle->getDBkey();
2184
2185                 if ( 0 == $id ) {
2186                         wfProfileOut( __METHOD__ );
2187                         return;
2188                 }
2189
2190                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2191                 array_push( $wgDeferredUpdateList, $u );
2192                 $u = new SearchUpdate( $id, $title, $text );
2193                 array_push( $wgDeferredUpdateList, $u );
2194
2195                 # If this is another user's talk page, update newtalk
2196                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2197                 # load of user talk pages and piss people off, nor if it's a minor edit
2198                 # by a properly-flagged bot.
2199                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2200                         && !($minoredit && $wgUser->isAllowed('nominornewtalk') ) ) {
2201                         if (wfRunHooks('ArticleEditUpdateNewTalk', array(&$this)) ) {
2202                                 $other = User::newFromName( $shortTitle );
2203                                 if( is_null( $other ) && User::isIP( $shortTitle ) ) {
2204                                         // An anonymous user
2205                                         $other = new User();
2206                                         $other->setName( $shortTitle );
2207                                 }
2208                                 if( $other ) {
2209                                         $other->setNewtalk( true );
2210                                 }
2211                         }
2212                 }
2213
2214                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2215                         $wgMessageCache->replace( $shortTitle, $text );
2216                 }
2217
2218                 wfProfileOut( __METHOD__ );
2219         }
2220
2221         /**
2222          * Perform article updates on a special page creation.
2223          *
2224          * @param Revision $rev
2225          *
2226          * @fixme This is a shitty interface function. Kill it and replace the
2227          * other shitty functions like editUpdates and such so it's not needed
2228          * anymore.
2229          */
2230         function createUpdates( $rev ) {
2231                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2232                 $this->mTotalAdjustment = 1;
2233                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2234                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2235         }
2236
2237         /**
2238          * Generate the navigation links when browsing through an article revisions
2239          * It shows the information as:
2240          *   Revision as of \<date\>; view current revision
2241          *   \<- Previous version | Next Version -\>
2242          *
2243          * @private
2244          * @param string $oldid         Revision ID of this article revision
2245          */
2246         function setOldSubtitle( $oldid=0 ) {
2247                 global $wgLang, $wgOut, $wgUser;
2248
2249                 if ( !wfRunHooks( 'DisplayOldSubtitle', array(&$this, &$oldid) ) ) {
2250                                 return;
2251                 }
2252
2253                 $revision = Revision::newFromId( $oldid );
2254
2255                 $current = ( $oldid == $this->mLatest );
2256                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2257                 $sk = $wgUser->getSkin();
2258                 $lnk = $current
2259                         ? wfMsg( 'currentrevisionlink' )
2260                         : $lnk = $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2261                 $curdiff = $current
2262                         ? wfMsg( 'diff' )
2263                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=cur&oldid='.$oldid );
2264                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2265                 $prevlink = $prev
2266                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2267                         : wfMsg( 'previousrevision' );
2268                 $prevdiff = $prev
2269                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=prev&oldid='.$oldid )
2270                         : wfMsg( 'diff' );
2271                 $nextlink = $current
2272                         ? wfMsg( 'nextrevision' )
2273                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2274                 $nextdiff = $current
2275                         ? wfMsg( 'diff' )
2276                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=next&oldid='.$oldid );
2277
2278                 $userlinks = $sk->userLink( $revision->getUser(), $revision->getUserText() )
2279                                                 . $sk->userToolLinks( $revision->getUser(), $revision->getUserText() );
2280
2281                 $r = "\n\t\t\t\t<div id=\"mw-revision-info\">" . wfMsg( 'revision-info', $td, $userlinks ) . "</div>\n" .
2282                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . wfMsg( 'revision-nav', $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
2283                 $wgOut->setSubtitle( $r );
2284         }
2285
2286         /**
2287          * This function is called right before saving the wikitext,
2288          * so we can do things like signatures and links-in-context.
2289          *
2290          * @param string $text
2291          */
2292         function preSaveTransform( $text ) {
2293                 global $wgParser, $wgUser;
2294                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2295         }
2296
2297         /* Caching functions */
2298
2299         /**
2300          * checkLastModified returns true if it has taken care of all
2301          * output to the client that is necessary for this request.
2302          * (that is, it has sent a cached version of the page)
2303          */
2304         function tryFileCache() {
2305                 static $called = false;
2306                 if( $called ) {
2307                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2308                         return;
2309                 }
2310                 $called = true;
2311                 if($this->isFileCacheable()) {
2312                         $touched = $this->mTouched;
2313                         $cache = new HTMLFileCache( $this->mTitle );
2314                         if($cache->isFileCacheGood( $touched )) {
2315                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2316                                 $cache->loadFromFileCache();
2317                                 return true;
2318                         } else {
2319                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2320                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2321                         }
2322                 } else {
2323                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2324                 }
2325         }
2326
2327         /**
2328          * Check if the page can be cached
2329          * @return bool
2330          */
2331         function isFileCacheable() {
2332                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest;
2333                 extract( $wgRequest->getValues( 'action', 'oldid', 'diff', 'redirect', 'printable' ) );
2334
2335                 return $wgUseFileCache
2336                         and (!$wgShowIPinHeader)
2337                         and ($this->getID() != 0)
2338                         and ($wgUser->isAnon())
2339                         and (!$wgUser->getNewtalk())
2340                         and ($this->mTitle->getNamespace() != NS_SPECIAL )
2341                         and (empty( $action ) || $action == 'view')
2342                         and (!isset($oldid))
2343                         and (!isset($diff))
2344                         and (!isset($redirect))
2345                         and (!isset($printable))
2346                         and (!$this->mRedirectedFrom);
2347         }
2348
2349         /**
2350          * Loads page_touched and returns a value indicating if it should be used
2351          *
2352          */
2353         function checkTouched() {
2354                 if( !$this->mDataLoaded ) {
2355                         $this->loadPageData();
2356                 }
2357                 return !$this->mIsRedirect;
2358         }
2359
2360         /**
2361          * Get the page_touched field
2362          */
2363         function getTouched() {
2364                 # Ensure that page data has been loaded
2365                 if( !$this->mDataLoaded ) {
2366                         $this->loadPageData();
2367                 }
2368                 return $this->mTouched;
2369         }
2370
2371         /**
2372          * Get the page_latest field
2373          */
2374         function getLatest() {
2375                 if ( !$this->mDataLoaded ) {
2376                         $this->loadPageData();
2377                 }
2378                 return $this->mLatest;
2379         }
2380
2381         /**
2382          * Edit an article without doing all that other stuff
2383          * The article must already exist; link tables etc
2384          * are not updated, caches are not flushed.
2385          *
2386          * @param string $text text submitted
2387          * @param string $comment comment submitted
2388          * @param bool $minor whereas it's a minor modification
2389          */
2390         function quickEdit( $text, $comment = '', $minor = 0 ) {
2391                 wfProfileIn( __METHOD__ );
2392
2393                 $dbw =& wfGetDB( DB_MASTER );
2394                 $dbw->begin();
2395                 $revision = new Revision( array(
2396                         'page'       => $this->getId(),
2397                         'text'       => $text,
2398                         'comment'    => $comment,
2399                         'minor_edit' => $minor ? 1 : 0,
2400                         ) );
2401                 $revision->insertOn( $dbw );
2402                 $this->updateRevisionOn( $dbw, $revision );
2403                 $dbw->commit();
2404
2405                 wfProfileOut( __METHOD__ );
2406         }
2407
2408         /**
2409          * Used to increment the view counter
2410          *
2411          * @static
2412          * @param integer $id article id
2413          */
2414         function incViewCount( $id ) {
2415                 $id = intval( $id );
2416                 global $wgHitcounterUpdateFreq, $wgDBtype;
2417
2418                 $dbw =& wfGetDB( DB_MASTER );
2419                 $pageTable = $dbw->tableName( 'page' );
2420                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
2421                 $acchitsTable = $dbw->tableName( 'acchits' );
2422
2423                 if( $wgHitcounterUpdateFreq <= 1 ){ //
2424                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
2425                         return;
2426                 }
2427
2428                 # Not important enough to warrant an error page in case of failure
2429                 $oldignore = $dbw->ignoreErrors( true );
2430
2431                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
2432
2433                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
2434                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
2435                         # Most of the time (or on SQL errors), skip row count check
2436                         $dbw->ignoreErrors( $oldignore );
2437                         return;
2438                 }
2439
2440                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
2441                 $row = $dbw->fetchObject( $res );
2442                 $rown = intval( $row->n );
2443                 if( $rown >= $wgHitcounterUpdateFreq ){
2444                         wfProfileIn( 'Article::incViewCount-collect' );
2445                         $old_user_abort = ignore_user_abort( true );
2446
2447                         if ($wgDBtype == 'mysql')
2448                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
2449                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
2450                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS".
2451                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
2452                                 'GROUP BY hc_id');
2453                         $dbw->query("DELETE FROM $hitcounterTable");
2454                         if ($wgDBtype == 'mysql')
2455                                 $dbw->query('UNLOCK TABLES');
2456                         $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
2457                                 'WHERE page_id = hc_id');
2458                         $dbw->query("DROP TABLE $acchitsTable");
2459
2460                         ignore_user_abort( $old_user_abort );
2461                         wfProfileOut( 'Article::incViewCount-collect' );
2462                 }
2463                 $dbw->ignoreErrors( $oldignore );
2464         }
2465
2466         /**#@+
2467          * The onArticle*() functions are supposed to be a kind of hooks
2468          * which should be called whenever any of the specified actions
2469          * are done.
2470          *
2471          * This is a good place to put code to clear caches, for instance.
2472          *
2473          * This is called on page move and undelete, as well as edit
2474          * @static
2475          * @param $title_obj a title object
2476          */
2477
2478         static function onArticleCreate($title) {
2479                 # The talk page isn't in the regular link tables, so we need to update manually:
2480                 if ( $title->isTalkPage() ) {
2481                         $other = $title->getSubjectPage();
2482                 } else {
2483                         $other = $title->getTalkPage();
2484                 }
2485                 $other->invalidateCache();
2486                 $other->purgeSquid();
2487
2488                 $title->touchLinks();
2489                 $title->purgeSquid();
2490         }
2491
2492         static function onArticleDelete( $title ) {
2493                 global $wgUseFileCache, $wgMessageCache;
2494
2495                 $title->touchLinks();
2496                 $title->purgeSquid();
2497
2498                 # File cache
2499                 if ( $wgUseFileCache ) {
2500                         $cm = new HTMLFileCache( $title );
2501                         @unlink( $cm->fileCacheName() );
2502                 }
2503
2504                 if( $title->getNamespace() == NS_MEDIAWIKI) {
2505                         $wgMessageCache->replace( $title->getDBkey(), false );
2506                 }
2507         }
2508
2509         /**
2510          * Purge caches on page update etc
2511          */
2512         static function onArticleEdit( $title ) {
2513                 global $wgDeferredUpdateList, $wgUseFileCache;
2514
2515                 // Invalidate caches of articles which include this page
2516                 $update = new HTMLCacheUpdate( $title, 'templatelinks' );
2517                 $wgDeferredUpdateList[] = $update;
2518
2519                 # Purge squid for this page only
2520                 $title->purgeSquid();
2521
2522                 # Clear file cache
2523                 if ( $wgUseFileCache ) {
2524                         $cm = new HTMLFileCache( $title );
2525                         @unlink( $cm->fileCacheName() );
2526                 }
2527         }
2528
2529         /**#@-*/
2530
2531         /**
2532          * Info about this page
2533          * Called for ?action=info when $wgAllowPageInfo is on.
2534          *
2535          * @public
2536          */
2537         function info() {
2538                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
2539
2540                 if ( !$wgAllowPageInfo ) {
2541                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
2542                         return;
2543                 }
2544
2545                 $page = $this->mTitle->getSubjectPage();
2546
2547                 $wgOut->setPagetitle( $page->getPrefixedText() );
2548                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ));
2549
2550                 # first, see if the page exists at all.
2551                 $exists = $page->getArticleId() != 0;
2552                 if( !$exists ) {
2553                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2554                                 $wgOut->addHTML(wfMsgWeirdKey ( $this->mTitle->getText() ) );
2555                         } else {
2556                                 $wgOut->addHTML(wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' ) );
2557                         }
2558                 } else {
2559                         $dbr =& wfGetDB( DB_SLAVE );
2560                         $wl_clause = array(
2561                                 'wl_title'     => $page->getDBkey(),
2562                                 'wl_namespace' => $page->getNamespace() );
2563                         $numwatchers = $dbr->selectField(
2564                                 'watchlist',
2565                                 'COUNT(*)',
2566                                 $wl_clause,
2567                                 __METHOD__,
2568                                 $this->getSelectOptions() );
2569
2570                         $pageInfo = $this->pageCountInfo( $page );
2571                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
2572
2573                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
2574                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
2575                         if( $talkInfo ) {
2576                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
2577                         }
2578                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
2579                         if( $talkInfo ) {
2580                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
2581                         }
2582                         $wgOut->addHTML( '</ul>' );
2583
2584                 }
2585         }
2586
2587         /**
2588          * Return the total number of edits and number of unique editors
2589          * on a given page. If page does not exist, returns false.
2590          *
2591          * @param Title $title
2592          * @return array
2593          * @private
2594          */
2595         function pageCountInfo( $title ) {
2596                 $id = $title->getArticleId();
2597                 if( $id == 0 ) {
2598                         return false;
2599                 }
2600
2601                 $dbr =& wfGetDB( DB_SLAVE );
2602
2603                 $rev_clause = array( 'rev_page' => $id );
2604
2605                 $edits = $dbr->selectField(
2606                         'revision',
2607                         'COUNT(rev_page)',
2608                         $rev_clause,
2609                         __METHOD__,
2610                         $this->getSelectOptions() );
2611
2612                 $authors = $dbr->selectField(
2613                         'revision',
2614                         'COUNT(DISTINCT rev_user_text)',
2615                         $rev_clause,
2616                         __METHOD__,
2617                         $this->getSelectOptions() );
2618
2619                 return array( 'edits' => $edits, 'authors' => $authors );
2620         }
2621
2622         /**
2623          * Return a list of templates used by this article.
2624          * Uses the templatelinks table
2625          *
2626          * @return array Array of Title objects
2627          */
2628         function getUsedTemplates() {
2629                 $result = array();
2630                 $id = $this->mTitle->getArticleID();
2631                 if( $id == 0 ) {
2632                         return array();
2633                 }
2634
2635                 $dbr =& wfGetDB( DB_SLAVE );
2636                 $res = $dbr->select( array( 'templatelinks' ),
2637                         array( 'tl_namespace', 'tl_title' ),
2638                         array( 'tl_from' => $id ),
2639                         'Article:getUsedTemplates' );
2640                 if ( false !== $res ) {
2641                         if ( $dbr->numRows( $res ) ) {
2642                                 while ( $row = $dbr->fetchObject( $res ) ) {
2643                                         $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2644                                 }
2645                         }
2646                 }
2647                 $dbr->freeResult( $res );
2648                 return $result;
2649         }
2650
2651         /**
2652          * Return an auto-generated summary if the text provided is a redirect.
2653          *
2654          * @param  string $text The wikitext to check
2655          * @return string '' or an appropriate summary
2656          */
2657         public static function getRedirectAutosummary( $text ) {
2658                 $rt = Title::newFromRedirect( $text );
2659                 if( is_object( $rt ) )
2660                         return wfMsgForContent( 'autoredircomment', $rt->getPrefixedText() );
2661                 else
2662                         return '';
2663         }
2664
2665         /**
2666          * Return an auto-generated summary if the new text is much shorter than
2667          * the old text.
2668          *
2669          * @param  string $oldtext The previous text of the page
2670          * @param  string $text    The submitted text of the page
2671          * @return string An appropriate autosummary, or an empty string.
2672          */
2673         public static function getBlankingAutosummary( $oldtext, $text ) {
2674                 if ($oldtext!='' && $text=='') {
2675                         return wfMsgForContent('autosumm-blank');
2676                 } elseif (strlen($oldtext) > 10 * strlen($text) && strlen($text) < 500) {
2677                         #Removing more than 90% of the article
2678                         global $wgContLang;
2679                         $truncatedtext = $wgContLang->truncate($text, max(0, 200 - strlen(wfMsgForContent('autosumm-replace'))), '...');
2680                         return wfMsgForContent('autosumm-replace', $truncatedtext);
2681                 } else {
2682                         return '';
2683                 }
2684         }
2685
2686         /**
2687         * Return an applicable autosummary if one exists for the given edit.
2688         * @param string $oldtext The previous text of the page.
2689         * @param string $newtext The submitted text of the page.
2690         * @param bitmask $flags A bitmask of flags submitted for the edit.
2691         * @return string An appropriate autosummary, or an empty string.
2692         */
2693         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2694
2695                 # This code is UGLY UGLY UGLY.
2696                 # Somebody PLEASE come up with a more elegant way to do it.
2697
2698                 $summary = '';
2699
2700                 #Blanking autosummaries
2701                 if (!($flags & EDIT_NEW))
2702                         $summary = self::getBlankingAutosummary( $oldtext, $newtext );
2703
2704                 if ($summary)
2705                         return $summary;
2706
2707                 #New redirect autosummaries.
2708                 if ( $flags & EDIT_NEW ) {
2709                         $summary = self::getRedirectAutosummary( $newtext );
2710                 }
2711
2712                 if ($summary)
2713                         return $summary;
2714
2715                 #New page autosummaries
2716                 if ($flags & EDIT_NEW && strlen($newtext) <= 500) {
2717                         #If they're making a new short article, give its text in the summary.
2718                         global $wgContLang;
2719                         $truncatedtext = $wgContLang->truncate( $newtext, max( 0, 200 -
2720                                 strlen( wfMsgForContent( 'autosumm-shortnew') ) ), '...' );
2721                         $summary = wfMsgForContent( 'autosumm-shortnew', $truncatedtext );
2722                 }
2723
2724                 if ($summary)
2725                         return $summary;
2726
2727                 return $summary;
2728         }
2729 }
2730
2731 ?>