includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  */
   5
   6 /**
   7  * Class representing a MediaWiki article and history.
   8  *
   9  * See design.txt for an overview.
  10  * Note: edit user interface and cache support functions have been
  11  * moved to separate EditPage and HTMLFileCache classes.
  12  *
  13  */
  14 class Article {
  15         /**@{{
  16          * @private
  17          */
  18         var $mComment;                  //!<
  19         var $mContent;                  //!<
  20         var $mContentLoaded;    //!<
  21         var $mCounter;                  //!<
  22         var $mForUpdate;                //!<
  23         var $mGoodAdjustment;   //!<
  24         var $mLatest;                   //!<
  25         var $mMinorEdit;                //!<
  26         var $mOldId;                    //!<
  27         var $mRedirectedFrom;   //!<
  28         var $mRedirectUrl;              //!<
  29         var $mRevIdFetched;             //!<
  30         var $mRevision;                 //!<
  31         var $mTimestamp;                //!<
  32         var $mTitle;                    //!<
  33         var $mTotalAdjustment;  //!<
  34         var $mTouched;                  //!<
  35         var $mUser;                             //!<
  36         var $mUserText;                 //!<
  37         /**@}}*/
  38
  39         /**
  40          * Constants used by internal components to get rollback results
  41          */
  42         const SUCCESS = 0;                      // Operation successful
  43         const PERM_DENIED = 1;          // Permission denied
  44         const BLOCKED = 2;                      // User has been blocked
  45         const READONLY = 3;                     // Wiki is in read-only mode
  46         const BAD_TOKEN = 4;            // Invalid token specified
  47         const BAD_TITLE = 5;            // $this is not a valid Article
  48         const ALREADY_ROLLED = 6;       // Someone else already rolled this back. $from and $summary will be set
  49         const ONLY_AUTHOR = 7;          // User is the only author of the page
  50
  51         /**
  52          * Constructor and clear the article
  53          * @param $title Reference to a Title object.
  54          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  55          */
  56         function __construct( &$title, $oldId = null ) {
  57                 $this->mTitle =& $title;
  58                 $this->mOldId = $oldId;
  59                 $this->clear();
  60         }
  61
  62         /**
  63          * Tell the page view functions that this view was redirected
  64          * from another page on the wiki.
  65          * @param $from Title object.
  66          */
  67         function setRedirectedFrom( $from ) {
  68                 $this->mRedirectedFrom = $from;
  69         }
  70
  71         /**
  72          * @return mixed false, Title of in-wiki target, or string with URL
  73          */
  74         function followRedirect() {
  75                 $text = $this->getContent();
  76                 $rt = Title::newFromRedirect( $text );
  77
  78                 # process if title object is valid and not special:userlogout
  79                 if( $rt ) {
  80                         if( $rt->getInterwiki() != '' ) {
  81                                 if( $rt->isLocal() ) {
  82                                         // Offsite wikis need an HTTP redirect.
  83                                         //
  84                                         // This can be hard to reverse and may produce loops,
  85                                         // so they may be disabled in the site configuration.
  86
  87                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
  88                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
  89                                 }
  90                         } else {
  91                                 if( $rt->getNamespace() == NS_SPECIAL ) {
  92                                         // Gotta handle redirects to special pages differently:
  93                                         // Fill the HTTP response "Location" header and ignore
  94                                         // the rest of the page we're on.
  95                                         //
  96                                         // This can be hard to reverse, so they may be disabled.
  97
  98                                         if( $rt->isSpecial( 'Userlogout' ) ) {
  99                                                 // rolleyes
 100                                         } else {
 101                                                 return $rt->getFullURL();
 102                                         }
 103                                 }
 104                                 return $rt;
 105                         }
 106                 }
 107
 108                 // No or invalid redirect
 109                 return false;
 110         }
 111
 112         /**
 113          * get the title object of the article
 114          */
 115         function getTitle() {
 116                 return $this->mTitle;
 117         }
 118
 119         /**
 120           * Clear the object
 121           * @private
 122           */
 123         function clear() {
 124                 $this->mDataLoaded    = false;
 125                 $this->mContentLoaded = false;
 126
 127                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 128                 $this->mRedirectedFrom = null; # Title object if set
 129                 $this->mUserText =
 130                 $this->mTimestamp = $this->mComment = '';
 131                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 132                 $this->mTouched = '19700101000000';
 133                 $this->mForUpdate = false;
 134                 $this->mIsRedirect = false;
 135                 $this->mRevIdFetched = 0;
 136                 $this->mRedirectUrl = false;
 137                 $this->mLatest = false;
 138         }
 139
 140         /**
 141          * Note that getContent/loadContent do not follow redirects anymore.
 142          * If you need to fetch redirectable content easily, try
 143          * the shortcut in Article::followContent()
 144          * FIXME
 145          * @todo There are still side-effects in this!
 146          *        In general, you should use the Revision class, not Article,
 147          *        to fetch text for purposes other than page views.
 148          *
 149          * @return Return the text of this revision
 150         */
 151         function getContent() {
 152                 global $wgUser, $wgOut;
 153
 154                 wfProfileIn( __METHOD__ );
 155
 156                 if ( 0 == $this->getID() ) {
 157                         wfProfileOut( __METHOD__ );
 158                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 159
 160                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 161                                 $ret = wfMsgWeirdKey ( $this->mTitle->getText() ) ;
 162                         } else {
 163                                 $ret = wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' );
 164                         }
 165
 166                         return "<div class='noarticletext'>$ret</div>";
 167                 } else {
 168                         $this->loadContent();
 169                         wfProfileOut( __METHOD__ );
 170                         return $this->mContent;
 171                 }
 172         }
 173
 174         /**
 175          * This function returns the text of a section, specified by a number ($section).
 176          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 177          * the first section before any such heading (section 0).
 178          *
 179          * If a section contains subsections, these are also returned.
 180          *
 181          * @param $text String: text to look in
 182          * @param $section Integer: section number
 183          * @return string text of the requested section
 184          * @deprecated
 185          */
 186         function getSection($text,$section) {
 187                 global $wgParser;
 188                 return $wgParser->getSection( $text, $section );
 189         }
 190
 191         /**
 192          * @return int The oldid of the article that is to be shown, 0 for the
 193          *             current revision
 194          */
 195         function getOldID() {
 196                 if ( is_null( $this->mOldId ) ) {
 197                         $this->mOldId = $this->getOldIDFromRequest();
 198                 }
 199                 return $this->mOldId;
 200         }
 201
 202         /**
 203          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 204          *
 205          * @return int The old id for the request
 206          */
 207         function getOldIDFromRequest() {
 208                 global $wgRequest;
 209                 $this->mRedirectUrl = false;
 210                 $oldid = $wgRequest->getVal( 'oldid' );
 211                 if ( isset( $oldid ) ) {
 212                         $oldid = intval( $oldid );
 213                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 214                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 215                                 if ( $nextid  ) {
 216                                         $oldid = $nextid;
 217                                 } else {
 218                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 219                                 }
 220                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 221                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 222                                 if ( $previd ) {
 223                                         $oldid = $previd;
 224                                 } else {
 225                                         # TODO
 226                                 }
 227                         }
 228                         # unused:
 229                         # $lastid = $oldid;
 230                 }
 231
 232                 if ( !$oldid ) {
 233                         $oldid = 0;
 234                 }
 235                 return $oldid;
 236         }
 237
 238         /**
 239          * Load the revision (including text) into this object
 240          */
 241         function loadContent() {
 242                 if ( $this->mContentLoaded ) return;
 243
 244                 # Query variables :P
 245                 $oldid = $this->getOldID();
 246
 247                 # Pre-fill content with error message so that if something
 248                 # fails we'll have something telling us what we intended.
 249                 $this->mOldId = $oldid;
 250                 $this->fetchContent( $oldid );
 251         }
 252
 253
 254         /**
 255          * Fetch a page record with the given conditions
 256          * @param Database $dbr
 257          * @param array    $conditions
 258          * @private
 259          */
 260         function pageData( $dbr, $conditions ) {
 261                 $fields = array(
 262                                 'page_id',
 263                                 'page_namespace',
 264                                 'page_title',
 265                                 'page_restrictions',
 266                                 'page_counter',
 267                                 'page_is_redirect',
 268                                 'page_is_new',
 269                                 'page_random',
 270                                 'page_touched',
 271                                 'page_latest',
 272                                 'page_len',
 273                 );
 274                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 275                 $row = $dbr->selectRow(
 276                         'page',
 277                         $fields,
 278                         $conditions,
 279                         __METHOD__
 280                 );
 281                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 282                 return $row ;
 283         }
 284
 285         /**
 286          * @param Database $dbr
 287          * @param Title $title
 288          */
 289         function pageDataFromTitle( $dbr, $title ) {
 290                 return $this->pageData( $dbr, array(
 291                         'page_namespace' => $title->getNamespace(),
 292                         'page_title'     => $title->getDBkey() ) );
 293         }
 294
 295         /**
 296          * @param Database $dbr
 297          * @param int $id
 298          */
 299         function pageDataFromId( $dbr, $id ) {
 300                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 301         }
 302
 303         /**
 304          * Set the general counter, title etc data loaded from
 305          * some source.
 306          *
 307          * @param object $data
 308          * @private
 309          */
 310         function loadPageData( $data = 'fromdb' ) {
 311                 if ( $data === 'fromdb' ) {
 312                         $dbr = $this->getDB();
 313                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 314                 }
 315
 316                 $lc =& LinkCache::singleton();
 317                 if ( $data ) {
 318                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle );
 319
 320                         $this->mTitle->mArticleID = $data->page_id;
 321
 322                         # Old-fashioned restrictions.
 323                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 324
 325                         $this->mCounter     = $data->page_counter;
 326                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 327                         $this->mIsRedirect  = $data->page_is_redirect;
 328                         $this->mLatest      = $data->page_latest;
 329                 } else {
 330                         if ( is_object( $this->mTitle ) ) {
 331                                 $lc->addBadLinkObj( $this->mTitle );
 332                         }
 333                         $this->mTitle->mArticleID = 0;
 334                 }
 335
 336                 $this->mDataLoaded  = true;
 337         }
 338
 339         /**
 340          * Get text of an article from database
 341          * Does *NOT* follow redirects.
 342          * @param int $oldid 0 for whatever the latest revision is
 343          * @return string
 344          */
 345         function fetchContent( $oldid = 0 ) {
 346                 if ( $this->mContentLoaded ) {
 347                         return $this->mContent;
 348                 }
 349
 350                 $dbr = $this->getDB();
 351
 352                 # Pre-fill content with error message so that if something
 353                 # fails we'll have something telling us what we intended.
 354                 $t = $this->mTitle->getPrefixedText();
 355                 if( $oldid ) {
 356                         $t .= ',oldid='.$oldid;
 357                 }
 358                 $this->mContent = wfMsg( 'missingarticle', $t ) ;
 359
 360                 if( $oldid ) {
 361                         $revision = Revision::newFromId( $oldid );
 362                         if( is_null( $revision ) ) {
 363                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 364                                 return false;
 365                         }
 366                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 367                         if( !$data ) {
 368                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 369                                 return false;
 370                         }
 371                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 372                         $this->loadPageData( $data );
 373                 } else {
 374                         if( !$this->mDataLoaded ) {
 375                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 376                                 if( !$data ) {
 377                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 378                                         return false;
 379                                 }
 380                                 $this->loadPageData( $data );
 381                         }
 382                         $revision = Revision::newFromId( $this->mLatest );
 383                         if( is_null( $revision ) ) {
 384                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$data->page_latest}\n" );
 385                                 return false;
 386                         }
 387                 }
 388
 389                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 390                 // We should instead work with the Revision object when we need it...
 391                 $this->mContent = $revision->userCan( Revision::DELETED_TEXT ) ? $revision->getRawText() : "";
 392                 //$this->mContent   = $revision->getText();
 393                 $this->mContent   = $revision->revText(); // Loads if user is allowed
 394
 395                 $this->mUser      = $revision->getUser();
 396                 $this->mUserText  = $revision->getUserText();
 397                 $this->mComment   = $revision->getComment();
 398                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 399
 400                 $this->mRevIdFetched = $revision->getID();
 401                 $this->mContentLoaded = true;
 402                 $this->mRevision =& $revision;
 403
 404                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 405
 406                 return $this->mContent;
 407         }
 408
 409         /**
 410          * Read/write accessor to select FOR UPDATE
 411          *
 412          * @param $x Mixed: FIXME
 413          */
 414         function forUpdate( $x = NULL ) {
 415                 return wfSetVar( $this->mForUpdate, $x );
 416         }
 417
 418         /**
 419          * Get the database which should be used for reads
 420          *
 421          * @return Database
 422          */
 423         function getDB() {
 424                 return wfGetDB( DB_MASTER );
 425         }
 426
 427         /**
 428          * Get options for all SELECT statements
 429          *
 430          * @param $options Array: an optional options array which'll be appended to
 431          *                       the default
 432          * @return Array: options
 433          */
 434         function getSelectOptions( $options = '' ) {
 435                 if ( $this->mForUpdate ) {
 436                         if ( is_array( $options ) ) {
 437                                 $options[] = 'FOR UPDATE';
 438                         } else {
 439                                 $options = 'FOR UPDATE';
 440                         }
 441                 }
 442                 return $options;
 443         }
 444
 445         /**
 446          * @return int Page ID
 447          */
 448         function getID() {
 449                 if( $this->mTitle ) {
 450                         return $this->mTitle->getArticleID();
 451                 } else {
 452                         return 0;
 453                 }
 454         }
 455
 456         /**
 457          * @return bool Whether or not the page exists in the database
 458          */
 459         function exists() {
 460                 return $this->getId() != 0;
 461         }
 462
 463         /**
 464          * @return int The view count for the page
 465          */
 466         function getCount() {
 467                 if ( -1 == $this->mCounter ) {
 468                         $id = $this->getID();
 469                         if ( $id == 0 ) {
 470                                 $this->mCounter = 0;
 471                         } else {
 472                                 $dbr = wfGetDB( DB_SLAVE );
 473                                 $this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
 474                                         'Article::getCount', $this->getSelectOptions() );
 475                         }
 476                 }
 477                 return $this->mCounter;
 478         }
 479
 480         /**
 481          * Determine whether a page  would be suitable for being counted as an
 482          * article in the site_stats table based on the title & its content
 483          *
 484          * @param $text String: text to analyze
 485          * @return bool
 486          */
 487         function isCountable( $text ) {
 488                 global $wgUseCommaCount;
 489
 490                 $token = $wgUseCommaCount ? ',' : '[[';
 491                 return
 492                         $this->mTitle->isContentPage()
 493                         && !$this->isRedirect( $text )
 494                         && in_string( $token, $text );
 495         }
 496
 497         /**
 498          * Tests if the article text represents a redirect
 499          *
 500          * @param $text String: FIXME
 501          * @return bool
 502          */
 503         function isRedirect( $text = false ) {
 504                 if ( $text === false ) {
 505                         $this->loadContent();
 506                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 507                 } else {
 508                         $titleObj = Title::newFromRedirect( $text );
 509                 }
 510                 return $titleObj !== NULL;
 511         }
 512
 513         /**
 514          * Returns true if the currently-referenced revision is the current edit
 515          * to this page (and it exists).
 516          * @return bool
 517          */
 518         function isCurrent() {
 519                 # If no oldid, this is the current version.
 520                 if ($this->getOldID() == 0)
 521                         return true;
 522
 523                 return $this->exists() &&
 524                         isset( $this->mRevision ) &&
 525                         $this->mRevision->isCurrent();
 526         }
 527
 528         /**
 529          * Loads everything except the text
 530          * This isn't necessary for all uses, so it's only done if needed.
 531          * @private
 532          */
 533         function loadLastEdit() {
 534                 if ( -1 != $this->mUser )
 535                         return;
 536
 537                 # New or non-existent articles have no user information
 538                 $id = $this->getID();
 539                 if ( 0 == $id ) return;
 540
 541                 $this->mLastRevision = Revision::loadFromPageId( $this->getDB(), $id );
 542                 if( !is_null( $this->mLastRevision ) ) {
 543                         $this->mUser      = $this->mLastRevision->getUser();
 544                         $this->mUserText  = $this->mLastRevision->getUserText();
 545                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 546                         $this->mComment   = $this->mLastRevision->getComment();
 547                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 548                         $this->mRevIdFetched = $this->mLastRevision->getID();
 549                 }
 550         }
 551
 552         function getTimestamp() {
 553                 // Check if the field has been filled by ParserCache::get()
 554                 if ( !$this->mTimestamp ) {
 555                         $this->loadLastEdit();
 556                 }
 557                 return wfTimestamp(TS_MW, $this->mTimestamp);
 558         }
 559
 560         function getUser() {
 561                 $this->loadLastEdit();
 562                 return $this->mUser;
 563         }
 564
 565         function getUserText() {
 566                 $this->loadLastEdit();
 567                 return $this->mUserText;
 568         }
 569
 570         function getComment() {
 571                 $this->loadLastEdit();
 572                 return $this->mComment;
 573         }
 574
 575         function getMinorEdit() {
 576                 $this->loadLastEdit();
 577                 return $this->mMinorEdit;
 578         }
 579
 580         function getRevIdFetched() {
 581                 $this->loadLastEdit();
 582                 return $this->mRevIdFetched;
 583         }
 584
 585         /**
 586          * @todo Document, fixme $offset never used.
 587          * @param $limit Integer: default 0.
 588          * @param $offset Integer: default 0.
 589          */
 590         function getContributors($limit = 0, $offset = 0) {
 591                 # XXX: this is expensive; cache this info somewhere.
 592
 593                 $contribs = array();
 594                 $dbr = wfGetDB( DB_SLAVE );
 595                 $revTable = $dbr->tableName( 'revision' );
 596                 $userTable = $dbr->tableName( 'user' );
 597                 $user = $this->getUser();
 598                 $pageId = $this->getId();
 599
 600                 $sql = "SELECT rev_user, rev_user_text, user_real_name, MAX(rev_timestamp) as timestamp
 601                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 602                         WHERE rev_page = $pageId
 603                         AND rev_user != $user
 604                         GROUP BY rev_user, rev_user_text, user_real_name
 605                         ORDER BY timestamp DESC";
 606
 607                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 608                 $sql .= ' '. $this->getSelectOptions();
 609
 610                 $res = $dbr->query($sql, __METHOD__);
 611
 612                 while ( $line = $dbr->fetchObject( $res ) ) {
 613                         $contribs[] = array($line->rev_user, $line->rev_user_text, $line->user_real_name);
 614                 }
 615
 616                 $dbr->freeResult($res);
 617                 return $contribs;
 618         }
 619
 620         /**
 621          * This is the default action of the script: just view the page of
 622          * the given title.
 623         */
 624         function view() {
 625                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 626                 global $wgEnableParserCache, $wgStylePath, $wgUseRCPatrol, $wgParser;
 627                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 628                 $sk = $wgUser->getSkin();
 629
 630                 wfProfileIn( __METHOD__ );
 631
 632                 $parserCache =& ParserCache::singleton();
 633                 $ns = $this->mTitle->getNamespace(); # shortcut
 634
 635                 # Get variables from query string
 636                 $oldid = $this->getOldID();
 637
 638                 # getOldID may want us to redirect somewhere else
 639                 if ( $this->mRedirectUrl ) {
 640                         $wgOut->redirect( $this->mRedirectUrl );
 641                         wfProfileOut( __METHOD__ );
 642                         return;
 643                 }
 644
 645                 $diff = $wgRequest->getVal( 'diff' );
 646                 $rcid = $wgRequest->getVal( 'rcid' );
 647                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 648                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 649                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 650
 651                 $wgOut->setArticleFlag( true );
 652
 653                 # Discourage indexing of printable versions, but encourage following
 654                 if( $wgOut->isPrintable() ) {
 655                         $policy = 'noindex,follow';
 656                 } elseif ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 657                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 658                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 659                         # Honour customised robot policies for this namespace
 660                         $policy = $wgNamespaceRobotPolicies[$ns];
 661                 } else {
 662                         # Default to encourage indexing and following links
 663                         $policy = 'index,follow';
 664                 }
 665                 $wgOut->setRobotPolicy( $policy );
 666
 667                 # If we got diff and oldid in the query, we want to see a
 668                 # diff page instead of the article.
 669
 670                 if ( !is_null( $diff ) ) {
 671                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 672
 673                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge );
 674                         // DifferenceEngine directly fetched the revision:
 675                         $this->mRevIdFetched = $de->mNewid;
 676                         $de->showDiffPage( $diffOnly );
 677
 678                         // Needed to get the page's current revision
 679                         $this->loadPageData();
 680                         if( $diff == 0 || $diff == $this->mLatest ) {
 681                                 # Run view updates for current revision only
 682                                 $this->viewUpdates();
 683                         }
 684                         wfProfileOut( __METHOD__ );
 685                         return;
 686                 }
 687
 688                 if ( empty( $oldid ) && $this->checkTouched() ) {
 689                         $wgOut->setETag($parserCache->getETag($this, $wgUser));
 690
 691                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 692                                 wfProfileOut( __METHOD__ );
 693                                 return;
 694                         } else if ( $this->tryFileCache() ) {
 695                                 # tell wgOut that output is taken care of
 696                                 $wgOut->disable();
 697                                 $this->viewUpdates();
 698                                 wfProfileOut( __METHOD__ );
 699                                 return;
 700                         }
 701                 }
 702
 703                 # Should the parser cache be used?
 704                 $pcache = $wgEnableParserCache
 705                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
 706                         && $this->exists()
 707                         && empty( $oldid )
 708                         && !$this->mTitle->isCssOrJsPage()
 709                         && !$this->mTitle->isCssJsSubpage();
 710                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 711                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 712                         wfIncrStats( 'pcache_miss_stub' );
 713                 }
 714
 715                 $wasRedirected = false;
 716                 if ( isset( $this->mRedirectedFrom ) ) {
 717                         // This is an internally redirected page view.
 718                         // We'll need a backlink to the source page for navigation.
 719                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 720                                 $sk = $wgUser->getSkin();
 721                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 722                                 $s = wfMsg( 'redirectedfrom', $redir );
 723                                 $wgOut->setSubtitle( $s );
 724
 725                                 // Set the fragment if one was specified in the redirect
 726                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
 727                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 728                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 729                                 }
 730                                 $wasRedirected = true;
 731                         }
 732                 } elseif ( !empty( $rdfrom ) ) {
 733                         // This is an externally redirected view, from some other wiki.
 734                         // If it was reported from a trusted site, supply a backlink.
 735                         global $wgRedirectSources;
 736                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 737                                 $sk = $wgUser->getSkin();
 738                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 739                                 $s = wfMsg( 'redirectedfrom', $redir );
 740                                 $wgOut->setSubtitle( $s );
 741                                 $wasRedirected = true;
 742                         }
 743                 }
 744
 745                 $outputDone = false;
 746                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 747                 if ( $pcache ) {
 748                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 749                                 // Ensure that UI elements requiring revision ID have
 750                                 // the correct version information.
 751                                 $wgOut->setRevisionId( $this->mLatest );
 752                                 $outputDone = true;
 753                         }
 754                 }
 755                 if ( !$outputDone ) {
 756                         $text = $this->getContent();
 757                         if ( $text === false ) {
 758                                 # Failed to load, replace text with error message
 759                                 $t = $this->mTitle->getPrefixedText();
 760                                 if( $oldid ) {
 761                                         $t .= ',oldid='.$oldid;
 762                                         $text = wfMsg( 'missingarticle', $t );
 763                                 } else {
 764                                         $text = wfMsg( 'noarticletext', $t );
 765                                 }
 766                         }
 767
 768                         # Another whitelist check in case oldid is altering the title
 769                         if ( !$this->mTitle->userCanRead() ) {
 770                                 $wgOut->loginToUse();
 771                                 $wgOut->output();
 772                                 exit;
 773                         }
 774
 775                         # We're looking at an old revision
 776
 777                         if ( !empty( $oldid ) ) {
 778                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 779                                 if( is_null( $this->mRevision ) ) {
 780                                         // FIXME: This would be a nice place to load the 'no such page' text.
 781                                 } else {
 782                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 783                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 784                                                 if( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 785                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-permission' ) );
 786                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 787                                                         return;
 788                                                 } else {
 789                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-view' ) );
 790                                                         // and we are allowed to see...
 791                                                 }
 792                                         }
 793                                 }
 794
 795                         }
 796                 }
 797                 if( !$outputDone ) {
 798                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 799
 800                          // Pages containing custom CSS or JavaScript get special treatment
 801                         if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 802                                 $wgOut->addHtml( wfMsgExt( 'clearyourcache', 'parse' ) );
 803
 804                                 // Give hooks a chance to customise the output
 805                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 806                                         // Wrap the whole lot in a <pre> and don't parse
 807                                         $m = array();
 808                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 809                                         $wgOut->addHtml( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 810                                         $wgOut->addHtml( htmlspecialchars( $this->mContent ) );
 811                                         $wgOut->addHtml( "\n</pre>\n" );
 812                                 }
 813
 814                         }
 815
 816                         elseif ( $rt = Title::newFromRedirect( $text ) ) {
 817                                 # Display redirect
 818                                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 819                                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 820                                 # Don't overwrite the subtitle if this was an old revision
 821                                 if( !$wasRedirected && $this->isCurrent() ) {
 822                                         $wgOut->setSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 823                                 }
 824                                 $link = $sk->makeLinkObj( $rt, $rt->getFullText() );
 825
 826                                 $wgOut->addHTML( '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
 827                                   '<span class="redirectText">'.$link.'</span>' );
 828
 829                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 830                                 $wgOut->addParserOutputNoText( $parseout );
 831                         } else if ( $pcache ) {
 832                                 # Display content and save to parser cache
 833                                 $this->outputWikiText( $text );
 834                         } else {
 835                                 # Display content, don't attempt to save to parser cache
 836                                 # Don't show section-edit links on old revisions... this way lies madness.
 837                                 if( !$this->isCurrent() ) {
 838                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 839                                 }
 840                                 # Display content and don't save to parser cache
 841                                 # With timing hack -- TS 2006-07-26
 842                                 $time = -wfTime();
 843                                 $this->outputWikiText( $text, false );
 844                                 $time += wfTime();
 845
 846                                 # Timing hack
 847                                 if ( $time > 3 ) {
 848                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 849                                                 $this->mTitle->getPrefixedDBkey()));
 850                                 }
 851
 852                                 if( !$this->isCurrent() ) {
 853                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 854                                 }
 855
 856                         }
 857                 }
 858                 /* title may have been set from the cache */
 859                 $t = $wgOut->getPageTitle();
 860                 if( empty( $t ) ) {
 861                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 862                 }
 863
 864                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 865                 if( $ns == NS_USER_TALK &&
 866                         User::isIP( $this->mTitle->getText() ) ) {
 867                         $wgOut->addWikiText( wfMsg('anontalkpagetext') );
 868                 }
 869
 870                 # If we have been passed an &rcid= parameter, we want to give the user a
 871                 # chance to mark this new article as patrolled.
 872                 if ( $wgUseRCPatrol && !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) ) {
 873                         $wgOut->addHTML(
 874                                 "<div class='patrollink'>" .
 875                                         wfMsgHtml( 'markaspatrolledlink',
 876                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
 877                                                 "action=markpatrolled&rcid=$rcid" )
 878                                         ) .
 879                                 '</div>'
 880                          );
 881                 }
 882
 883                 # Trackbacks
 884                 if ($wgUseTrackbacks)
 885                         $this->addTrackbacks();
 886
 887                 $this->viewUpdates();
 888                 wfProfileOut( __METHOD__ );
 889         }
 890
 891         function addTrackbacks() {
 892                 global $wgOut, $wgUser;
 893
 894                 $dbr = wfGetDB(DB_SLAVE);
 895                 $tbs = $dbr->select(
 896                                 /* FROM   */ 'trackbacks',
 897                                 /* SELECT */ array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
 898                                 /* WHERE  */ array('tb_page' => $this->getID())
 899                 );
 900
 901                 if (!$dbr->numrows($tbs))
 902                         return;
 903
 904                 $tbtext = "";
 905                 while ($o = $dbr->fetchObject($tbs)) {
 906                         $rmvtxt = "";
 907                         if ($wgUser->isAllowed( 'trackback' )) {
 908                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid="
 909                                                 . $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
 910                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
 911                         }
 912                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
 913                                         $o->tb_title,
 914                                         $o->tb_url,
 915                                         $o->tb_ex,
 916                                         $o->tb_name,
 917                                         $rmvtxt);
 918                 }
 919                 $wgOut->addWikitext(wfMsg('trackbackbox', $tbtext));
 920         }
 921
 922         function deletetrackback() {
 923                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
 924
 925                 if (!$wgUser->matchEditToken($wgRequest->getVal('token'))) {
 926                         $wgOut->addWikitext(wfMsg('sessionfailure'));
 927                         return;
 928                 }
 929
 930                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
 931
 932                 if (count($permission_errors)>0)
 933                 {
 934                         $wgOut->showPermissionsErrorPage( $permission_errors );
 935                         return;
 936                 }
 937
 938                 $db = wfGetDB(DB_MASTER);
 939                 $db->delete('trackbacks', array('tb_id' => $wgRequest->getInt('tbid')));
 940                 $wgTitle->invalidateCache();
 941                 $wgOut->addWikiText(wfMsg('trackbackdeleteok'));
 942         }
 943
 944         function render() {
 945                 global $wgOut;
 946
 947                 $wgOut->setArticleBodyOnly(true);
 948                 $this->view();
 949         }
 950
 951         /**
 952          * Handle action=purge
 953          */
 954         function purge() {
 955                 global $wgUser, $wgRequest, $wgOut;
 956
 957                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
 958                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
 959                                 $this->doPurge();
 960                         }
 961                 } else {
 962                         $msg = $wgOut->parse( wfMsg( 'confirm_purge' ) );
 963                         $action = htmlspecialchars( $_SERVER['REQUEST_URI'] );
 964                         $button = htmlspecialchars( wfMsg( 'confirm_purge_button' ) );
 965                         $msg = str_replace( '$1',
 966                                 "<form method=\"post\" action=\"$action\">\n" .
 967                                 "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
 968                                 "</form>\n", $msg );
 969
 970                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 971                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 972                         $wgOut->addHTML( $msg );
 973                 }
 974         }
 975
 976         /**
 977          * Perform the actions of a page purging
 978          */
 979         function doPurge() {
 980                 global $wgUseSquid;
 981                 // Invalidate the cache
 982                 $this->mTitle->invalidateCache();
 983
 984                 if ( $wgUseSquid ) {
 985                         // Commit the transaction before the purge is sent
 986                         $dbw = wfGetDB( DB_MASTER );
 987                         $dbw->immediateCommit();
 988
 989                         // Send purge
 990                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 991                         $update->doUpdate();
 992                 }
 993                 $this->view();
 994         }
 995
 996         /**
 997          * Insert a new empty page record for this article.
 998          * This *must* be followed up by creating a revision
 999          * and running $this->updateToLatest( $rev_id );
1000          * or else the record will be left in a funky state.
1001          * Best if all done inside a transaction.
1002          *
1003          * @param Database $dbw
1004          * @return int     The newly created page_id key
1005          * @private
1006          */
1007         function insertOn( $dbw ) {
1008                 wfProfileIn( __METHOD__ );
1009
1010                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1011                 $dbw->insert( 'page', array(
1012                         'page_id'           => $page_id,
1013                         'page_namespace'    => $this->mTitle->getNamespace(),
1014                         'page_title'        => $this->mTitle->getDBkey(),
1015                         'page_counter'      => 0,
1016                         'page_restrictions' => '',
1017                         'page_is_redirect'  => 0, # Will set this shortly...
1018                         'page_is_new'       => 1,
1019                         'page_random'       => wfRandom(),
1020                         'page_touched'      => $dbw->timestamp(),
1021                         'page_latest'       => 0, # Fill this in shortly...
1022                         'page_len'          => 0, # Fill this in shortly...
1023                 ), __METHOD__ );
1024                 $newid = $dbw->insertId();
1025
1026                 $this->mTitle->resetArticleId( $newid );
1027
1028                 wfProfileOut( __METHOD__ );
1029                 return $newid;
1030         }
1031
1032         /**
1033          * Update the page record to point to a newly saved revision.
1034          *
1035          * @param Database $dbw
1036          * @param Revision $revision For ID number, and text used to set
1037                                      length and redirect status fields
1038          * @param int $lastRevision If given, will not overwrite the page field
1039          *                          when different from the currently set value.
1040          *                          Giving 0 indicates the new page flag should
1041          *                          be set on.
1042          * @param bool $lastRevIsRedirect If given, will optimize adding and
1043          *                                                      removing rows in redirect table.
1044          * @return bool true on success, false on failure
1045          * @private
1046          */
1047         function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1048                 wfProfileIn( __METHOD__ );
1049
1050                 $text = $revision->getText();
1051                 $rt = Title::newFromRedirect( $text );
1052
1053                 $conditions = array( 'page_id' => $this->getId() );
1054                 if( !is_null( $lastRevision ) ) {
1055                         # An extra check against threads stepping on each other
1056                         $conditions['page_latest'] = $lastRevision;
1057                 }
1058
1059                 $dbw->update( 'page',
1060                         array( /* SET */
1061                                 'page_latest'      => $revision->getId(),
1062                                 'page_touched'     => $dbw->timestamp(),
1063                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1064                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1065                                 'page_len'         => strlen( $text ),
1066                         ),
1067                         $conditions,
1068                         __METHOD__ );
1069
1070                 $result = $dbw->affectedRows() != 0;
1071
1072                 if ($result) {
1073                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1074                 }
1075
1076                 wfProfileOut( __METHOD__ );
1077                 return $result;
1078         }
1079
1080         /**
1081          * Add row to the redirect table if this is a redirect, remove otherwise.
1082          *
1083          * @param Database $dbw
1084          * @param $redirectTitle a title object pointing to the redirect target,
1085          *                                                      or NULL if this is not a redirect
1086          * @param bool $lastRevIsRedirect If given, will optimize adding and
1087          *                                                      removing rows in redirect table.
1088          * @return bool true on success, false on failure
1089          * @private
1090          */
1091         function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1092
1093                 // Always update redirects (target link might have changed)
1094                 // Update/Insert if we don't know if the last revision was a redirect or not
1095                 // Delete if changing from redirect to non-redirect
1096                 $isRedirect = !is_null($redirectTitle);
1097                 if ($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1098
1099                         wfProfileIn( __METHOD__ );
1100
1101                         if ($isRedirect) {
1102
1103                                 // This title is a redirect, Add/Update row in the redirect table
1104                                 $set = array( /* SET */
1105                                         'rd_namespace' => $redirectTitle->getNamespace(),
1106                                         'rd_title'     => $redirectTitle->getDBkey(),
1107                                         'rd_from'      => $this->getId(),
1108                                 );
1109
1110                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1111                         } else {
1112                                 // This is not a redirect, remove row from redirect table
1113                                 $where = array( 'rd_from' => $this->getId() );
1114                                 $dbw->delete( 'redirect', $where, __METHOD__);
1115                         }
1116
1117                         wfProfileOut( __METHOD__ );
1118                         return ( $dbw->affectedRows() != 0 );
1119                 }
1120
1121                 return true;
1122         }
1123
1124         /**
1125          * If the given revision is newer than the currently set page_latest,
1126          * update the page record. Otherwise, do nothing.
1127          *
1128          * @param Database $dbw
1129          * @param Revision $revision
1130          */
1131         function updateIfNewerOn( &$dbw, $revision ) {
1132                 wfProfileIn( __METHOD__ );
1133
1134                 $row = $dbw->selectRow(
1135                         array( 'revision', 'page' ),
1136                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1137                         array(
1138                                 'page_id' => $this->getId(),
1139                                 'page_latest=rev_id' ),
1140                         __METHOD__ );
1141                 if( $row ) {
1142                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1143                                 wfProfileOut( __METHOD__ );
1144                                 return false;
1145                         }
1146                         $prev = $row->rev_id;
1147                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1148                 } else {
1149                         # No or missing previous revision; mark the page as new
1150                         $prev = 0;
1151                         $lastRevIsRedirect = null;
1152                 }
1153
1154                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1155                 wfProfileOut( __METHOD__ );
1156                 return $ret;
1157         }
1158
1159         /**
1160          * @return string Complete article text, or null if error
1161          */
1162         function replaceSection($section, $text, $summary = '', $edittime = NULL) {
1163                 wfProfileIn( __METHOD__ );
1164
1165                 if( $section == '' ) {
1166                         // Whole-page edit; let the text through unmolested.
1167                 } else {
1168                         if( is_null( $edittime ) ) {
1169                                 $rev = Revision::newFromTitle( $this->mTitle );
1170                         } else {
1171                                 $dbw = wfGetDB( DB_MASTER );
1172                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1173                         }
1174                         if( is_null( $rev ) ) {
1175                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1176                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1177                                 return null;
1178                         }
1179                         $oldtext = $rev->getText();
1180
1181                         if( $section == 'new' ) {
1182                                 # Inserting a new section
1183                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1184                                 $text = strlen( trim( $oldtext ) ) > 0
1185                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1186                                                 : "{$subject}{$text}";
1187                         } else {
1188                                 # Replacing an existing section; roll out the big guns
1189                                 global $wgParser;
1190                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1191                         }
1192
1193                 }
1194
1195                 wfProfileOut( __METHOD__ );
1196                 return $text;
1197         }
1198
1199         /**
1200          * @deprecated use Article::doEdit()
1201          */
1202         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false ) {
1203                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1204                         ( $isminor ? EDIT_MINOR : 0 ) |
1205                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 );
1206
1207                 # If this is a comment, add the summary as headline
1208                 if ( $comment && $summary != "" ) {
1209                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1210                 }
1211
1212                 $this->doEdit( $text, $summary, $flags );
1213
1214                 $dbw = wfGetDB( DB_MASTER );
1215                 if ($watchthis) {
1216                         if (!$this->mTitle->userIsWatching()) {
1217                                 $dbw->begin();
1218                                 $this->doWatch();
1219                                 $dbw->commit();
1220                         }
1221                 } else {
1222                         if ( $this->mTitle->userIsWatching() ) {
1223                                 $dbw->begin();
1224                                 $this->doUnwatch();
1225                                 $dbw->commit();
1226                         }
1227                 }
1228                 $this->doRedirect( $this->isRedirect( $text ) );
1229         }
1230
1231         /**
1232          * @deprecated use Article::doEdit()
1233          */
1234         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1235                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1236                         ( $minor ? EDIT_MINOR : 0 ) |
1237                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1238
1239                 $good = $this->doEdit( $text, $summary, $flags );
1240                 if ( $good ) {
1241                         $dbw = wfGetDB( DB_MASTER );
1242                         if ($watchthis) {
1243                                 if (!$this->mTitle->userIsWatching()) {
1244                                         $dbw->begin();
1245                                         $this->doWatch();
1246                                         $dbw->commit();
1247                                 }
1248                         } else {
1249                                 if ( $this->mTitle->userIsWatching() ) {
1250                                         $dbw->begin();
1251                                         $this->doUnwatch();
1252                                         $dbw->commit();
1253                                 }
1254                         }
1255
1256                         $extraq = ''; // Give extensions a chance to modify URL query on update
1257                         wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraq ) );
1258
1259                         $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraq );
1260                 }
1261                 return $good;
1262         }
1263
1264         /**
1265          * Article::doEdit()
1266          *
1267          * Change an existing article or create a new article. Updates RC and all necessary caches,
1268          * optionally via the deferred update array.
1269          *
1270          * $wgUser must be set before calling this function.
1271          *
1272          * @param string $text New text
1273          * @param string $summary Edit summary
1274          * @param integer $flags bitfield:
1275          *      EDIT_NEW
1276          *          Article is known or assumed to be non-existent, create a new one
1277          *      EDIT_UPDATE
1278          *          Article is known or assumed to be pre-existing, update it
1279          *      EDIT_MINOR
1280          *          Mark this edit minor, if the user is allowed to do so
1281          *      EDIT_SUPPRESS_RC
1282          *          Do not log the change in recentchanges
1283          *      EDIT_FORCE_BOT
1284          *          Mark the edit a "bot" edit regardless of user rights
1285          *      EDIT_DEFER_UPDATES
1286          *          Defer some of the updates until the end of index.php
1287          *      EDIT_AUTOSUMMARY
1288          *          Fill in blank summaries with generated text where possible
1289          *
1290          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1291          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return false. If
1292          * EDIT_NEW is specified and the article does exist, a duplicate key error will cause an exception
1293          * to be thrown from the Database. These two conditions are also possible with auto-detection due
1294          * to MediaWiki's performance-optimised locking strategy.
1295          *
1296          * @return bool success
1297          */
1298         function doEdit( $text, $summary, $flags = 0 ) {
1299                 global $wgUser, $wgDBtransactions;
1300
1301                 wfProfileIn( __METHOD__ );
1302                 $good = true;
1303
1304                 if ( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1305                         $aid = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
1306                         if ( $aid ) {
1307                                 $flags |= EDIT_UPDATE;
1308                         } else {
1309                                 $flags |= EDIT_NEW;
1310                         }
1311                 }
1312
1313                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1314                         &$summary, $flags & EDIT_MINOR,
1315                         null, null, &$flags ) ) )
1316                 {
1317                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1318                         wfProfileOut( __METHOD__ );
1319                         return false;
1320                 }
1321
1322                 # Silently ignore EDIT_MINOR if not allowed
1323                 $isminor = ( $flags & EDIT_MINOR ) && $wgUser->isAllowed('minoredit');
1324                 $bot = $wgUser->isAllowed( 'bot' ) || ( $flags & EDIT_FORCE_BOT );
1325
1326                 $oldtext = $this->getContent();
1327                 $oldsize = strlen( $oldtext );
1328
1329                 # Provide autosummaries if one is not provided.
1330                 if ($flags & EDIT_AUTOSUMMARY && $summary == '')
1331                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1332
1333                 $text = $this->preSaveTransform( $text );
1334                 $newsize = strlen( $text );
1335
1336                 $dbw = wfGetDB( DB_MASTER );
1337                 $now = wfTimestampNow();
1338
1339                 if ( $flags & EDIT_UPDATE ) {
1340                         # Update article, but only if changed.
1341
1342                         # Make sure the revision is either completely inserted or not inserted at all
1343                         if( !$wgDBtransactions ) {
1344                                 $userAbort = ignore_user_abort( true );
1345                         }
1346
1347                         $lastRevision = 0;
1348                         $revisionId = 0;
1349
1350                         if ( 0 != strcmp( $text, $oldtext ) ) {
1351                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1352                                   - (int)$this->isCountable( $oldtext );
1353                                 $this->mTotalAdjustment = 0;
1354
1355                                 $lastRevision = $dbw->selectField(
1356                                         'page', 'page_latest', array( 'page_id' => $this->getId() ) );
1357
1358                                 if ( !$lastRevision ) {
1359                                         # Article gone missing
1360                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1361                                         wfProfileOut( __METHOD__ );
1362                                         return false;
1363                                 }
1364
1365                                 $revision = new Revision( array(
1366                                         'page'       => $this->getId(),
1367                                         'comment'    => $summary,
1368                                         'minor_edit' => $isminor,
1369                                         'text'       => $text
1370                                         ) );
1371
1372                                 $dbw->begin();
1373                                 $revisionId = $revision->insertOn( $dbw );
1374
1375                                 # Update page
1376                                 $ok = $this->updateRevisionOn( $dbw, $revision, $lastRevision );
1377
1378                                 if( !$ok ) {
1379                                         /* Belated edit conflict! Run away!! */
1380                                         $good = false;
1381                                         $dbw->rollback();
1382                                 } else {
1383                                         # Update recentchanges
1384                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1385                                                 $rcid = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $wgUser, $summary,
1386                                                         $lastRevision, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1387                                                         $revisionId );
1388
1389                                                 # Mark as patrolled if the user can do so
1390                                                 if( $GLOBALS['wgUseRCPatrol'] && $wgUser->isAllowed( 'autopatrol' ) ) {
1391                                                         RecentChange::markPatrolled( $rcid );
1392                                                         PatrolLog::record( $rcid, true );
1393                                                 }
1394                                         }
1395                                         $wgUser->incEditCount();
1396                                         $dbw->commit();
1397                                 }
1398                         } else {
1399                                 $revision = null;
1400                                 // Keep the same revision ID, but do some updates on it
1401                                 $revisionId = $this->getRevIdFetched();
1402                                 // Update page_touched, this is usually implicit in the page update
1403                                 // Other cache updates are done in onArticleEdit()
1404                                 $this->mTitle->invalidateCache();
1405                         }
1406
1407                         if( !$wgDBtransactions ) {
1408                                 ignore_user_abort( $userAbort );
1409                         }
1410
1411                         if ( $good ) {
1412                                 # Invalidate cache of this article and all pages using this article
1413                                 # as a template. Partly deferred.
1414                                 Article::onArticleEdit( $this->mTitle );
1415
1416                                 # Update links tables, site stats, etc.
1417                                 $changed = ( strcmp( $oldtext, $text ) != 0 );
1418                                 $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1419                         }
1420                 } else {
1421                         # Create new article
1422
1423                         # Set statistics members
1424                         # We work out if it's countable after PST to avoid counter drift
1425                         # when articles are created with {{subst:}}
1426                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1427                         $this->mTotalAdjustment = 1;
1428
1429                         $dbw->begin();
1430
1431                         # Add the page record; stake our claim on this title!
1432                         # This will fail with a database query exception if the article already exists
1433                         $newid = $this->insertOn( $dbw );
1434
1435                         # Save the revision text...
1436                         $revision = new Revision( array(
1437                                 'page'       => $newid,
1438                                 'comment'    => $summary,
1439                                 'minor_edit' => $isminor,
1440                                 'text'       => $text
1441                                 ) );
1442                         $revisionId = $revision->insertOn( $dbw );
1443
1444                         $this->mTitle->resetArticleID( $newid );
1445
1446                         # Update the page record with revision data
1447                         $this->updateRevisionOn( $dbw, $revision, 0 );
1448
1449                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1450                                 $rcid = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary, $bot,
1451                                   '', strlen( $text ), $revisionId );
1452                                 # Mark as patrolled if the user can
1453                                 if( $GLOBALS['wgUseRCPatrol'] && $wgUser->isAllowed( 'autopatrol' ) ) {
1454                                         RecentChange::markPatrolled( $rcid );
1455                                         PatrolLog::record( $rcid, true );
1456                                 }
1457                         }
1458                         $wgUser->incEditCount();
1459                         $dbw->commit();
1460
1461                         # Update links, etc.
1462                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1463
1464                         # Clear caches
1465                         Article::onArticleCreate( $this->mTitle );
1466
1467                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$wgUser, $text, $summary,
1468                          $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1469                 }
1470
1471                 if ( $good && !( $flags & EDIT_DEFER_UPDATES ) ) {
1472                         wfDoUpdates();
1473                 }
1474
1475                 if ( $good ) {
1476                         wfRunHooks( 'ArticleSaveComplete', array( &$this, &$wgUser, $text, $summary,
1477                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1478                 }
1479
1480                 wfProfileOut( __METHOD__ );
1481                 return $good;
1482         }
1483
1484         /**
1485          * @deprecated wrapper for doRedirect
1486          */
1487         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1488                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1489         }
1490
1491         /**
1492          * Output a redirect back to the article.
1493          * This is typically used after an edit.
1494          *
1495          * @param boolean $noRedir Add redirect=no
1496          * @param string $sectionAnchor section to redirect to, including "#"
1497          * @param string $extraq, extra query params
1498          */
1499         function doRedirect( $noRedir = false, $sectionAnchor = '', $extraq = '' ) {
1500                 global $wgOut;
1501                 if ( $noRedir ) {
1502                         $query = 'redirect=no';
1503                         if( $extraq )
1504                                 $query .= "&$query";
1505                 } else {
1506                         $query = $extraq;
1507                 }
1508                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1509         }
1510
1511         /**
1512          * Mark this particular edit as patrolled
1513          */
1514         function markpatrolled() {
1515                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUser;
1516                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1517
1518                 # Check RC patrol config. option
1519                 if( !$wgUseRCPatrol ) {
1520                         $wgOut->errorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1521                         return;
1522                 }
1523
1524                 # Check permissions
1525                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'patrol', $wgUser );
1526
1527                 if (count($permission_errors)>0)
1528                 {
1529                         $wgOut->showPermissionsErrorPage( $permission_errors );
1530                         return;
1531                 }
1532
1533                 # If we haven't been given an rc_id value, we can't do anything
1534                 $rcid = $wgRequest->getVal( 'rcid' );
1535                 if( !$rcid ) {
1536                         $wgOut->errorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1537                         return;
1538                 }
1539
1540                 # Handle the 'MarkPatrolled' hook
1541                 if( !wfRunHooks( 'MarkPatrolled', array( $rcid, &$wgUser, false ) ) ) {
1542                         return;
1543                 }
1544
1545                 $return = SpecialPage::getTitleFor( 'Recentchanges' );
1546                 # If it's left up to us, check that the user is allowed to patrol this edit
1547                 # If the user has the "autopatrol" right, then we'll assume there are no
1548                 # other conditions stopping them doing so
1549                 if( !$wgUser->isAllowed( 'autopatrol' ) ) {
1550                         $rc = RecentChange::newFromId( $rcid );
1551                         # Graceful error handling, as we've done before here...
1552                         # (If the recent change doesn't exist, then it doesn't matter whether
1553                         # the user is allowed to patrol it or not; nothing is going to happen
1554                         if( is_object( $rc ) && $wgUser->getName() == $rc->getAttribute( 'rc_user_text' ) ) {
1555                                 # The user made this edit, and can't patrol it
1556                                 # Tell them so, and then back off
1557                                 $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1558                                 $wgOut->addWikiText( wfMsgNoTrans( 'markedaspatrollederror-noautopatrol' ) );
1559                                 $wgOut->returnToMain( false, $return );
1560                                 return;
1561                         }
1562                 }
1563
1564                 # Mark the edit as patrolled
1565                 RecentChange::markPatrolled( $rcid );
1566                 PatrolLog::record( $rcid );
1567                 wfRunHooks( 'MarkPatrolledComplete', array( &$rcid, &$wgUser, false ) );
1568
1569                 # Inform the user
1570                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1571                 $wgOut->addWikiText( wfMsgNoTrans( 'markedaspatrolledtext' ) );
1572                 $wgOut->returnToMain( false, $return );
1573         }
1574
1575         /**
1576          * User-interface handler for the "watch" action
1577          */
1578
1579         function watch() {
1580
1581                 global $wgUser, $wgOut;
1582
1583                 if ( $wgUser->isAnon() ) {
1584                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1585                         return;
1586                 }
1587                 if ( wfReadOnly() ) {
1588                         $wgOut->readOnlyPage();
1589                         return;
1590                 }
1591
1592                 if( $this->doWatch() ) {
1593                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1594                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1595
1596                         $link = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
1597                         $text = wfMsg( 'addedwatchtext', $link );
1598                         $wgOut->addWikiText( $text );
1599                 }
1600
1601                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1602         }
1603
1604         /**
1605          * Add this page to $wgUser's watchlist
1606          * @return bool true on successful watch operation
1607          */
1608         function doWatch() {
1609                 global $wgUser;
1610                 if( $wgUser->isAnon() ) {
1611                         return false;
1612                 }
1613
1614                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1615                         $wgUser->addWatch( $this->mTitle );
1616
1617                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1618                 }
1619
1620                 return false;
1621         }
1622
1623         /**
1624          * User interface handler for the "unwatch" action.
1625          */
1626         function unwatch() {
1627
1628                 global $wgUser, $wgOut;
1629
1630                 if ( $wgUser->isAnon() ) {
1631                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1632                         return;
1633                 }
1634                 if ( wfReadOnly() ) {
1635                         $wgOut->readOnlyPage();
1636                         return;
1637                 }
1638
1639                 if( $this->doUnwatch() ) {
1640                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1641                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1642
1643                         $link = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
1644                         $text = wfMsg( 'removedwatchtext', $link );
1645                         $wgOut->addWikiText( $text );
1646                 }
1647
1648                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1649         }
1650
1651         /**
1652          * Stop watching a page
1653          * @return bool true on successful unwatch
1654          */
1655         function doUnwatch() {
1656                 global $wgUser;
1657                 if( $wgUser->isAnon() ) {
1658                         return false;
1659                 }
1660
1661                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1662                         $wgUser->removeWatch( $this->mTitle );
1663
1664                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1665                 }
1666
1667                 return false;
1668         }
1669
1670         /**
1671          * action=protect handler
1672          */
1673         function protect() {
1674                 $form = new ProtectionForm( $this );
1675                 $form->execute();
1676         }
1677
1678         /**
1679          * action=unprotect handler (alias)
1680          */
1681         function unprotect() {
1682                 $this->protect();
1683         }
1684
1685         /**
1686          * Update the article's restriction field, and leave a log entry.
1687          *
1688          * @param array $limit set of restriction keys
1689          * @param string $reason
1690          * @return bool true on success
1691          */
1692         function updateRestrictions( $limit = array(), $reason = '', $cascade = 0, $expiry = null ) {
1693                 global $wgUser, $wgRestrictionTypes, $wgContLang, $wgGroupPermissions;
1694
1695                 $id = $this->mTitle->getArticleID();
1696                 if( !$wgUser->isAllowed( 'protect' ) || wfReadOnly() || $id == 0 ) {
1697                         return false;
1698                 }
1699
1700                 if (!$cascade) {
1701                         $cascade = false;
1702                 }
1703
1704                 // Take this opportunity to purge out expired restrictions
1705                 Title::purgeExpiredRestrictions();
1706
1707                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1708                 # we expect a single selection, but the schema allows otherwise.
1709                 $current = array();
1710                 foreach( $wgRestrictionTypes as $action )
1711                         $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1712
1713                 $current = Article::flattenRestrictions( $current );
1714                 $updated = Article::flattenRestrictions( $limit );
1715
1716                 $changed = ( $current != $updated );
1717                 $changed = $changed || ($this->mTitle->areRestrictionsCascading() != $cascade);
1718                 $changed = $changed || ($this->mTitle->mRestrictionsExpiry != $expiry);
1719                 $protect = ( $updated != '' );
1720
1721                 # If nothing's changed, do nothing
1722                 if( $changed ) {
1723                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1724
1725                                 $dbw = wfGetDB( DB_MASTER );
1726
1727                                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1728
1729                                 $expiry_description = '';
1730                                 if ( $encodedExpiry != 'infinity' ) {
1731                                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ) ).')';
1732                                 }
1733
1734                                 # Prepare a null revision to be added to the history
1735                                 $modified = $current != '' && $protect;
1736                                 if ( $protect ) {
1737                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1738                                 } else {
1739                                         $comment_type = 'unprotectedarticle';
1740                                 }
1741                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1742
1743                                 foreach( $limit as $action => $restrictions ) {
1744                                         # Check if the group level required to edit also can protect pages
1745                                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1746                                         $cascade = ( $cascade && isset($wgGroupPermissions[$restrictions]['protect']) && $wgGroupPermissions[$restrictions]['protect'] );
1747                                 }
1748
1749                                 $cascade_description = '';
1750                                 if ($cascade) {
1751                                         $cascade_description = ' ['.wfMsg('protect-summary-cascade').']';
1752                                 }
1753
1754                                 if( $reason )
1755                                         $comment .= ": $reason";
1756                                 if( $protect )
1757                                         $comment .= " [$updated]";
1758                                 if ( $expiry_description && $protect )
1759                                         $comment .= "$expiry_description";
1760                                 if ( $cascade )
1761                                         $comment .= "$cascade_description";
1762
1763                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $comment, true );
1764                                 $nullRevId = $nullRevision->insertOn( $dbw );
1765
1766                                 # Update restrictions table
1767                                 foreach( $limit as $action => $restrictions ) {
1768                                         if ($restrictions != '' ) {
1769                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
1770                                                         array( 'pr_page' => $id, 'pr_type' => $action
1771                                                                 , 'pr_level' => $restrictions, 'pr_cascade' => $cascade ? 1 : 0
1772                                                                 , 'pr_expiry' => $encodedExpiry ), __METHOD__  );
1773                                         } else {
1774                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1775                                                         'pr_type' => $action ), __METHOD__ );
1776                                         }
1777                                 }
1778
1779                                 # Update page record
1780                                 $dbw->update( 'page',
1781                                         array( /* SET */
1782                                                 'page_touched' => $dbw->timestamp(),
1783                                                 'page_restrictions' => '',
1784                                                 'page_latest' => $nullRevId
1785                                         ), array( /* WHERE */
1786                                                 'page_id' => $id
1787                                         ), 'Article::protect'
1788                                 );
1789                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1790
1791                                 # Update the protection log
1792                                 $log = new LogPage( 'protect' );
1793
1794                                 if( $protect ) {
1795                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason . " [$updated]$cascade_description$expiry_description" ) );
1796                                 } else {
1797                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1798                                 }
1799
1800                         } # End hook
1801                 } # End "changed" check
1802
1803                 return true;
1804         }
1805
1806         /**
1807          * Take an array of page restrictions and flatten it to a string
1808          * suitable for insertion into the page_restrictions field.
1809          * @param array $limit
1810          * @return string
1811          * @private
1812          */
1813         function flattenRestrictions( $limit ) {
1814                 if( !is_array( $limit ) ) {
1815                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
1816                 }
1817                 $bits = array();
1818                 ksort( $limit );
1819                 foreach( $limit as $action => $restrictions ) {
1820                         if( $restrictions != '' ) {
1821                                 $bits[] = "$action=$restrictions";
1822                         }
1823                 }
1824                 return implode( ':', $bits );
1825         }
1826
1827         /*
1828          * UI entry point for page deletion
1829          */
1830         function delete() {
1831                 global $wgUser, $wgOut, $wgRequest;
1832                 $confirm = $wgRequest->wasPosted() &&
1833                         $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1834                 $reason = $wgRequest->getText( 'wpReason' );
1835                 # Flag to hide all contents of the archived revisions
1836                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed('deleterevision');
1837
1838                 # This code desperately needs to be totally rewritten
1839
1840                 # Check permissions
1841                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1842
1843                 if (count($permission_errors)>0)
1844                 {
1845                         $wgOut->showPermissionsErrorPage( $permission_errors );
1846                         return;
1847                 }
1848
1849                 $wgOut->setPagetitle( wfMsg( 'confirmdelete' ) );
1850
1851                 # Better double-check that it hasn't been deleted yet!
1852                 $dbw = wfGetDB( DB_MASTER );
1853                 $conds = $this->mTitle->pageCond();
1854                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
1855                 if ( $latest === false ) {
1856                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
1857                         return;
1858                 }
1859
1860                 if( $confirm ) {
1861                         $this->doDelete( $reason, $suppress );
1862                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
1863                                 $this->doWatch();
1864                         } elseif( $this->mTitle->userIsWatching() ) {
1865                                 $this->doUnwatch();
1866                         }
1867                         return;
1868                 }
1869
1870                 # determine whether this page has earlier revisions
1871                 # and insert a warning if it does
1872                 $maxRevisions = 20;
1873                 $authors = $this->getLastNAuthors( $maxRevisions, $latest );
1874
1875                 if( count( $authors ) > 1 && !$confirm ) {
1876                         $skin=$wgUser->getSkin();
1877                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
1878                 }
1879
1880                 # If a single user is responsible for all revisions, find out who they are
1881                 if ( count( $authors ) == $maxRevisions ) {
1882                         // Query bailed out, too many revisions to find out if they're all the same
1883                         $authorOfAll = false;
1884                 } else {
1885                         $authorOfAll = reset( $authors );
1886                         foreach ( $authors as $author ) {
1887                                 if ( $authorOfAll != $author ) {
1888                                         $authorOfAll = false;
1889                                         break;
1890                                 }
1891                         }
1892                 }
1893                 # Fetch article text
1894                 $rev = Revision::newFromTitle( $this->mTitle );
1895
1896                 if( !is_null( $rev ) ) {
1897                         # if this is a mini-text, we can paste part of it into the deletion reason
1898                         $text = $rev->getText();
1899
1900                         #if this is empty, an earlier revision may contain "useful" text
1901                         $blanked = false;
1902                         if( $text == '' ) {
1903                                 $prev = $rev->getPrevious();
1904                                 if( $prev ) {
1905                                         $text = $prev->getText();
1906                                         $blanked = true;
1907                                 }
1908                         }
1909
1910                         $length = strlen( $text );
1911
1912                         # this should not happen, since it is not possible to store an empty, new
1913                         # page. Let's insert a standard text in case it does, though
1914                         if( $length == 0 && $reason === '' ) {
1915                                 $reason = wfMsgForContent( 'exblank' );
1916                         }
1917
1918                         if( $reason === '' ) {
1919                                 # comment field=255, let's grep the first 150 to have some user
1920                                 # space left
1921                                 global $wgContLang;
1922                                 $text = $wgContLang->truncate( $text, 150, '...' );
1923
1924                                 # let's strip out newlines
1925                                 $text = preg_replace( "/[\n\r]/", '', $text );
1926
1927                                 if( !$blanked ) {
1928                                         if( $authorOfAll === false ) {
1929                                                 $reason = wfMsgForContent( 'excontent', $text );
1930                                         } else {
1931                                                 $reason = wfMsgForContent( 'excontentauthor', $text, $authorOfAll );
1932                                         }
1933                                 } else {
1934                                         $reason = wfMsgForContent( 'exbeforeblank', $text );
1935                                 }
1936                         }
1937                 }
1938
1939                 return $this->confirmDelete( '', $reason );
1940         }
1941
1942         /**
1943          * Get the last N authors
1944          * @param int $num Number of revisions to get
1945          * @param string $revLatest The latest rev_id, selected from the master (optional)
1946          * @return array Array of authors, duplicates not removed
1947          */
1948         function getLastNAuthors( $num, $revLatest = 0 ) {
1949                 wfProfileIn( __METHOD__ );
1950
1951                 // First try the slave
1952                 // If that doesn't have the latest revision, try the master
1953                 $continue = 2;
1954                 $db = wfGetDB( DB_SLAVE );
1955                 do {
1956                         $res = $db->select( array( 'page', 'revision' ),
1957                                 array( 'rev_id', 'rev_user_text' ),
1958                                 array(
1959                                         'page_namespace' => $this->mTitle->getNamespace(),
1960                                         'page_title' => $this->mTitle->getDBkey(),
1961                                         'rev_page = page_id'
1962                                 ), __METHOD__, $this->getSelectOptions( array(
1963                                         'ORDER BY' => 'rev_timestamp DESC',
1964                                         'LIMIT' => $num
1965                                 ) )
1966                         );
1967                         if ( !$res ) {
1968                                 wfProfileOut( __METHOD__ );
1969                                 return array();
1970                         }
1971                         $row = $db->fetchObject( $res );
1972                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1973                                 $db = wfGetDB( DB_MASTER );
1974                                 $continue--;
1975                         } else {
1976                                 $continue = 0;
1977                         }
1978                 } while ( $continue );
1979
1980                 $authors = array( $row->rev_user_text );
1981                 while ( $row = $db->fetchObject( $res ) ) {
1982                         $authors[] = $row->rev_user_text;
1983                 }
1984                 wfProfileOut( __METHOD__ );
1985                 return $authors;
1986         }
1987
1988         /**
1989          * Output deletion confirmation dialog
1990          */
1991         function confirmDelete( $par, $reason ) {
1992                 global $wgOut, $wgUser;
1993
1994                 wfDebug( "Article::confirmDelete\n" );
1995
1996                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
1997                 $wgOut->setSubtitle( wfMsg( 'deletesub', $sub ) );
1998                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1999                 $wgOut->addWikiText( wfMsg( 'confirmdeletetext' ) );
2000
2001                 $formaction = $this->mTitle->escapeLocalURL( 'action=delete' . $par );
2002
2003                 $confirm = htmlspecialchars( wfMsg( 'deletepage' ) );
2004                 $delcom = htmlspecialchars( wfMsg( 'deletecomment' ) );
2005                 $token = htmlspecialchars( $wgUser->editToken() );
2006                 $watch = Xml::checkLabel( wfMsg( 'watchthis' ), 'wpWatch', 'wpWatch', $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching(), array( 'tabindex' => '2' ) );
2007                 if ( $wgUser->isAllowed( 'deleterevision' ) ) {
2008                         $supress = "<tr><td>&nbsp;</td><td>";
2009                         $supress .= Xml::checkLabel( wfMsg( 'revdelete-suppress' ), 'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '2' ) );
2010                         $supress .= "</td></tr>";
2011                 } else {
2012                         $supress = '';
2013                 }
2014
2015                 $wgOut->addHTML( "
2016 <form id='deleteconfirm' method='post' action=\"{$formaction}\">
2017         <table border='0'>
2018                 <tr>
2019                         <td align='right'>
2020                                 <label for='wpReason'>{$delcom}:</label>
2021                         </td>
2022                         <td align='left'>
2023                                 <input type='text' size='60' name='wpReason' id='wpReason' value=\"" . htmlspecialchars( $reason ) . "\" tabindex=\"1\" />
2024                         </td>
2025                 </tr>
2026                 $supress
2027                 <tr>
2028                         <td>&nbsp;</td>
2029                         <td>$watch</td>
2030                 </tr>
2031                 <tr>
2032                         <td>&nbsp;</td>
2033                         <td>
2034                                 <input type='submit' name='wpConfirmB' id='wpConfirmB' value=\"{$confirm}\" tabindex=\"3\" />
2035                         </td>
2036                 </tr>
2037         </table>
2038         <input type='hidden' name='wpEditToken' value=\"{$token}\" />
2039 </form>\n" );
2040
2041                 $wgOut->returnToMain( false, $this->mTitle );
2042
2043                 $this->showLogExtract( $wgOut );
2044         }
2045
2046
2047         /**
2048          * Show relevant lines from the deletion log
2049          */
2050         function showLogExtract( $out ) {
2051                 $out->addHtml( '<h2>' . htmlspecialchars( LogPage::logName( 'delete' ) ) . '</h2>' );
2052                 $logViewer = new LogViewer(
2053                         new LogReader(
2054                                 new FauxRequest(
2055                                         array( 'page' => $this->mTitle->getPrefixedText(),
2056                                                'type' => 'delete' ) ) ) );
2057                 $logViewer->showList( $out );
2058         }
2059
2060
2061         /**
2062          * Perform a deletion and output success or failure messages
2063          */
2064         function doDelete( $reason, $suppress = false ) {
2065                 global $wgOut, $wgUser;
2066                 wfDebug( __METHOD__."\n" );
2067
2068                 if (wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason))) {
2069                         if ( $this->doDeleteArticle( $reason, $suppress ) ) {
2070                                 $deleted = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2071
2072                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2073                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2074
2075                                 $loglink = '[[Special:Log/delete|' . wfMsg( 'deletionlog' ) . ']]';
2076                                 $text = wfMsg( 'deletedtext', $deleted, $loglink );
2077
2078                                 $wgOut->addWikiText( $text );
2079                                 $wgOut->returnToMain( false );
2080                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason));
2081                         } else {
2082                                 $wgOut->showFatalError( wfMsg( 'cannotdelete' ).'<br/>'.wfMsg('cannotdelete-merge') );
2083                         }
2084                 }
2085         }
2086
2087         /**
2088          * Back-end article deletion
2089          * Deletes the article with database consistency, writes logs, purges caches
2090          * Returns success
2091          */
2092         function doDeleteArticle( $reason, $suppress = false ) {
2093                 global $wgUseSquid, $wgDeferredUpdateList;
2094                 global $wgUseTrackbacks;
2095
2096                 wfDebug( __METHOD__."\n" );
2097
2098                 $dbw = wfGetDB( DB_MASTER );
2099                 $ns = $this->mTitle->getNamespace();
2100                 $t = $this->mTitle->getDBkey();
2101                 $id = $this->mTitle->getArticleID();
2102
2103                 if ( $t == '' || $id == 0 ) {
2104                         return false;
2105                 }
2106                 // Do not fuck up histories by merging them in annoying, unrevertable ways
2107                 // This page id should match any deleted ones (excepting NULL values)
2108                 $otherpages = $dbw->selectField( 'archive', 'COUNT(*)',
2109                         array('ar_namespace' => $ns, 'ar_title' => $t,
2110                                 'ar_page_id IS NOT NULL', "ar_page_id != $id" ),
2111                         __METHOD__ );
2112                 if( $otherpages )
2113                         return false;
2114
2115                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
2116                 array_push( $wgDeferredUpdateList, $u );
2117
2118                 // Bitfields to further supress the content
2119                 if ( $suppress ) {
2120                         $bitfield = 0;
2121                         // This should be 15...
2122                         $bitfield |= Revision::DELETED_TEXT;
2123                         $bitfield |= Revision::DELETED_COMMENT;
2124                         $bitfield |= Revision::DELETED_USER;
2125                         $bitfield |= Revision::DELETED_RESTRICTED;
2126                 } else {
2127                         $bitfield = 'rev_deleted';
2128                 }
2129
2130                 // For now, shunt the revision data into the archive table.
2131                 // Text is *not* removed from the text table; bulk storage
2132                 // is left intact to avoid breaking block-compression or
2133                 // immutable storage schemes.
2134                 //
2135                 // For backwards compatibility, note that some older archive
2136                 // table entries will have ar_text and ar_flags fields still.
2137                 //
2138                 // In the future, we may keep revisions and mark them with
2139                 // the rev_deleted field, which is reserved for this purpose.
2140                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2141                         array(
2142                                 'ar_namespace'  => 'page_namespace',
2143                                 'ar_title'      => 'page_title',
2144                                 'ar_comment'    => 'rev_comment',
2145                                 'ar_user'       => 'rev_user',
2146                                 'ar_user_text'  => 'rev_user_text',
2147                                 'ar_timestamp'  => 'rev_timestamp',
2148                                 'ar_minor_edit' => 'rev_minor_edit',
2149                                 'ar_rev_id'     => 'rev_id',
2150                                 'ar_text_id'    => 'rev_text_id',
2151                                 'ar_text'       => '\'\'', // Be explicit to appease
2152                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2153                                 'ar_len'                => 'rev_len',
2154                                 'ar_page_id'    => 'page_id',
2155                                 'ar_deleted'    => $bitfield
2156                         ), array(
2157                                 'page_id' => $id,
2158                                 'page_id = rev_page'
2159                         ), __METHOD__
2160                 );
2161
2162                 # Delete restrictions for it
2163                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2164
2165                 # Now that it's safely backed up, delete it
2166                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2167
2168                 # If using cascading deletes, we can skip some explicit deletes
2169                 if ( !$dbw->cascadingDeletes() ) {
2170
2171                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2172
2173                         if ($wgUseTrackbacks)
2174                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2175
2176                         # Delete outgoing links
2177                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2178                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2179                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2180                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2181                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2182                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2183                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2184                 }
2185
2186                 # If using cleanup triggers, we can skip some manual deletes
2187                 if ( !$dbw->cleanupTriggers() ) {
2188
2189                         # Clean up recentchanges entries...
2190                         $dbw->delete( 'recentchanges', array( 'rc_namespace' => $ns, 'rc_title' => $t ), __METHOD__ );
2191                 }
2192
2193                 # Clear caches
2194                 Article::onArticleDelete( $this->mTitle );
2195
2196                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2197                 $logtype = ($suppress) ? 'oversight' : 'delete';
2198                 $log = new LogPage( $logtype );
2199                 $log->addEntry( 'delete', $this->mTitle, $reason );
2200
2201                 # Clear the cached article id so the interface doesn't act like we exist
2202                 $this->mTitle->resetArticleID( 0 );
2203                 $this->mTitle->mArticleID = 0;
2204                 return true;
2205         }
2206
2207         /**
2208          * Roll back the most recent consecutive set of edits to a page
2209          * from the same user; fails if there are no eligible edits to
2210          * roll back to, e.g. user is the sole contributor
2211          *
2212          * @param string $fromP - Name of the user whose edits to rollback.
2213          * @param string $summary - Custom summary. Set to default summary if empty.
2214          * @param string $token - Rollback token.
2215          * @param bool $bot - If true, mark all reverted edits as bot.
2216          *
2217          * @param array $resultDetails contains result-specific dict of additional values
2218          *    ALREADY_ROLLED : 'current' (rev)
2219          *    SUCCESS        : 'summary' (str), 'current' (rev), 'target' (rev)
2220          *
2221          * @return self::SUCCESS on succes, self::* on failure
2222          */
2223         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2224                 global $wgUser, $wgUseRCPatrol;
2225                 $resultDetails = null;
2226
2227                 # Just in case it's being called from elsewhere
2228
2229                 if( $wgUser->isAllowed( 'rollback' ) && $this->mTitle->userCan( 'edit' ) ) {
2230                         if( $wgUser->isBlocked() ) {
2231                                 return self::BLOCKED;
2232                         }
2233                 } else {
2234                         return self::PERM_DENIED;
2235                 }
2236
2237                 if ( wfReadOnly() ) {
2238                         return self::READONLY;
2239                 }
2240
2241                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2242                         return self::BAD_TOKEN;
2243
2244                 $dbw = wfGetDB( DB_MASTER );
2245
2246                 # Get the last editor
2247                 $current = Revision::newFromTitle( $this->mTitle );
2248                 if( is_null( $current ) ) {
2249                         # Something wrong... no page?
2250                         return self::BAD_TITLE;
2251                 }
2252
2253                 $from = str_replace( '_', ' ', $fromP );
2254                 if( $from != $current->getUserText() ) {
2255                         $resultDetails = array( 'current' => $current );
2256                         return self::ALREADY_ROLLED;
2257                 }
2258
2259                 # Get the last edit not by this guy
2260                 $user = intval( $current->getUser() );
2261                 $user_text = $dbw->addQuotes( $current->getUserText() );
2262                 $s = $dbw->selectRow( 'revision',
2263                         array( 'rev_id', 'rev_timestamp' ),
2264                         array(
2265                                 'rev_page' => $current->getPage(),
2266                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
2267                         ), __METHOD__,
2268                         array(
2269                                 'USE INDEX' => 'page_timestamp',
2270                                 'ORDER BY'  => 'rev_timestamp DESC' )
2271                         );
2272                 if( $s === false ) {
2273                         # Something wrong
2274                         return self::ONLY_AUTHOR;
2275                 }
2276
2277                 $set = array();
2278                 if ( $bot ) {
2279                         # Mark all reverted edits as bot
2280                         $set['rc_bot'] = 1;
2281                 }
2282                 if ( $wgUseRCPatrol ) {
2283                         # Mark all reverted edits as patrolled
2284                         $set['rc_patrolled'] = 1;
2285                 }
2286
2287                 if ( $set ) {
2288                         $dbw->update( 'recentchanges', $set,
2289                                         array( /* WHERE */
2290                                                 'rc_cur_id' => $current->getPage(),
2291                                                 'rc_user_text' => $current->getUserText(),
2292                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2293                                         ), __METHOD__
2294                                 );
2295                 }
2296
2297                 $target = Revision::newFromId( $s->rev_id );
2298                 # Revision *must* be public and we don't well handle deleted edits on top
2299                 if ( $target->isDeleted(REVISION::DELETED_TEXT) ) {
2300                         $wgOut->setPageTitle( wfMsg('rollbackfailed') );
2301                         $wgOut->addHTML( wfMsg( 'missingarticle' ) );
2302                 }
2303                 # Get the edit summary
2304                 if( empty( $summary ) )
2305                         $summary = wfMsgForContent( 'revertpage', $target->getUserText(), $from );
2306
2307                 # Save
2308                 $flags = EDIT_UPDATE | EDIT_MINOR;
2309                 if( $bot )
2310                         $flags |= EDIT_FORCE_BOT;
2311                 $this->doEdit( $target->getText(), $summary, $flags );
2312
2313                 $resultDetails = array(
2314                         'summary' => $summary,
2315                         'current' => $current,
2316                         'target' => $target,
2317                 );
2318                 return self::SUCCESS;
2319         }
2320
2321         /**
2322          * User interface for rollback operations
2323          */
2324         function rollback() {
2325                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2326
2327                 $details = null;
2328
2329                 # Skip the permissions-checking in doRollback() itself, by checking permissions here.
2330
2331                 $perm_errors = array_merge( $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser ),
2332                                                 $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser ) );
2333
2334                 if (count($perm_errors)) {
2335                         $wgOut->showPermissionsErrorPage( $perm_errors );
2336                         return;
2337                 }
2338
2339                 $result = $this->doRollback(
2340                         $wgRequest->getVal( 'from' ),
2341                         $wgRequest->getText( 'summary' ),
2342                         $wgRequest->getVal( 'token' ),
2343                         $wgRequest->getBool( 'bot' ),
2344                         $details
2345                 );
2346
2347                 switch( $result ) {
2348                         case self::BLOCKED:
2349                                 $wgOut->blockedPage();
2350                                 break;
2351                         case self::PERM_DENIED:
2352                                 $wgOut->permissionRequired( 'rollback' );
2353                                 break;
2354                         case self::READONLY:
2355                                 $wgOut->readOnlyPage( $this->getContent() );
2356                                 break;
2357                         case self::BAD_TOKEN:
2358                                 $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2359                                 $wgOut->addWikiText( wfMsg( 'sessionfailure' ) );
2360                                 break;
2361                         case self::BAD_TITLE:
2362                                 $wgOut->addHtml( wfMsg( 'notanarticle' ) );
2363                                 break;
2364                         case self::ALREADY_ROLLED:
2365                                 $current = $details['current'];
2366                                 $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2367                                 $wgOut->addWikiText(
2368                                         wfMsg( 'alreadyrolled',
2369                                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2370                                                 htmlspecialchars( $wgRequest->getVal( 'from' ) ),
2371                                                 htmlspecialchars( $current->getUserText() )
2372                                         )
2373                                 );
2374                                 if( $current->getComment() != '' ) {
2375                                         $wgOut->addHtml( wfMsg( 'editcomment',
2376                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ) );
2377                                 }
2378                                 break;
2379                         case self::ONLY_AUTHOR:
2380                                 $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2381                                 $wgOut->addHtml( wfMsg( 'cantrollback' ) );
2382                                 break;
2383                         case self::SUCCESS:
2384                                 $current = $details['current'];
2385                                 $target = $details['target'];
2386                                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2387                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2388                                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2389                                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2390                                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2391                                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2392                                 $wgOut->addHtml( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2393                                 $wgOut->returnToMain( false, $this->mTitle );
2394                                 break;
2395                         default:
2396                                 throw new MWException( __METHOD__ . ": Unknown return value `{$result}`" );
2397                 }
2398
2399         }
2400
2401
2402         /**
2403          * Do standard deferred updates after page view
2404          * @private
2405          */
2406         function viewUpdates() {
2407                 global $wgDeferredUpdateList;
2408
2409                 if ( 0 != $this->getID() ) {
2410                         global $wgDisableCounters;
2411                         if( !$wgDisableCounters ) {
2412                                 Article::incViewCount( $this->getID() );
2413                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2414                                 array_push( $wgDeferredUpdateList, $u );
2415                         }
2416                 }
2417
2418                 # Update newtalk / watchlist notification status
2419                 global $wgUser;
2420                 $wgUser->clearNotification( $this->mTitle );
2421         }
2422
2423         /**
2424          * Do standard deferred updates after page edit.
2425          * Update links tables, site stats, search index and message cache.
2426          * Every 100th edit, prune the recent changes table.
2427          *
2428          * @private
2429          * @param $text New text of the article
2430          * @param $summary Edit summary
2431          * @param $minoredit Minor edit
2432          * @param $timestamp_of_pagechange Timestamp associated with the page change
2433          * @param $newid rev_id value of the new revision
2434          * @param $changed Whether or not the content actually changed
2435          */
2436         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2437                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser;
2438
2439                 wfProfileIn( __METHOD__ );
2440
2441                 # Parse the text
2442                 $options = new ParserOptions;
2443                 $options->setTidy(true);
2444                 $poutput = $wgParser->parse( $text, $this->mTitle, $options, true, true, $newid );
2445
2446                 # Save it to the parser cache
2447                 $parserCache =& ParserCache::singleton();
2448                 $parserCache->save( $poutput, $this, $wgUser );
2449
2450                 # Update the links tables
2451                 $u = new LinksUpdate( $this->mTitle, $poutput );
2452                 $u->doUpdate();
2453
2454                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2455                         if ( 0 == mt_rand( 0, 99 ) ) {
2456                                 // Flush old entries from the `recentchanges` table; we do this on
2457                                 // random requests so as to avoid an increase in writes for no good reason
2458                                 global $wgRCMaxAge;
2459                                 $dbw = wfGetDB( DB_MASTER );
2460                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2461                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2462                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2463                                 $dbw->query( $sql );
2464                         }
2465                 }
2466
2467                 $id = $this->getID();
2468                 $title = $this->mTitle->getPrefixedDBkey();
2469                 $shortTitle = $this->mTitle->getDBkey();
2470
2471                 if ( 0 == $id ) {
2472                         wfProfileOut( __METHOD__ );
2473                         return;
2474                 }
2475
2476                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2477                 array_push( $wgDeferredUpdateList, $u );
2478                 $u = new SearchUpdate( $id, $title, $text );
2479                 array_push( $wgDeferredUpdateList, $u );
2480
2481                 # If this is another user's talk page, update newtalk
2482                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2483                 # load of user talk pages and piss people off, nor if it's a minor edit
2484                 # by a properly-flagged bot.
2485                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2486                         && !($minoredit && $wgUser->isAllowed('nominornewtalk') ) ) {
2487                         if (wfRunHooks('ArticleEditUpdateNewTalk', array(&$this)) ) {
2488                                 $other = User::newFromName( $shortTitle );
2489                                 if( is_null( $other ) && User::isIP( $shortTitle ) ) {
2490                                         // An anonymous user
2491                                         $other = new User();
2492                                         $other->setName( $shortTitle );
2493                                 }
2494                                 if( $other ) {
2495                                         $other->setNewtalk( true );
2496                                 }
2497                         }
2498                 }
2499
2500                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2501                         $wgMessageCache->replace( $shortTitle, $text );
2502                 }
2503
2504                 wfProfileOut( __METHOD__ );
2505         }
2506
2507         /**
2508          * Perform article updates on a special page creation.
2509          *
2510          * @param Revision $rev
2511          *
2512          * @todo This is a shitty interface function. Kill it and replace the
2513          * other shitty functions like editUpdates and such so it's not needed
2514          * anymore.
2515          */
2516         function createUpdates( $rev ) {
2517                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2518                 $this->mTotalAdjustment = 1;
2519                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2520                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2521         }
2522
2523         /**
2524          * Generate the navigation links when browsing through an article revisions
2525          * It shows the information as:
2526          *   Revision as of \<date\>; view current revision
2527          *   \<- Previous version | Next Version -\>
2528          *
2529          * @private
2530          * @param string $oldid         Revision ID of this article revision
2531          */
2532         function setOldSubtitle( $oldid=0 ) {
2533                 global $wgLang, $wgOut, $wgUser;
2534
2535                 if ( !wfRunHooks( 'DisplayOldSubtitle', array(&$this, &$oldid) ) ) {
2536                                 return;
2537                 }
2538
2539                 $revision = Revision::newFromId( $oldid );
2540
2541                 $current = ( $oldid == $this->mLatest );
2542                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2543                 $sk = $wgUser->getSkin();
2544                 $lnk = $current
2545                         ? wfMsg( 'currentrevisionlink' )
2546                         : $lnk = $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2547                 $curdiff = $current
2548                         ? wfMsg( 'diff' )
2549                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=cur&oldid='.$oldid );
2550                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2551                 $prevlink = $prev
2552                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2553                         : wfMsg( 'previousrevision' );
2554                 $prevdiff = $prev
2555                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=prev&oldid='.$oldid )
2556                         : wfMsg( 'diff' );
2557                 $nextlink = $current
2558                         ? wfMsg( 'nextrevision' )
2559                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2560                 $nextdiff = $current
2561                         ? wfMsg( 'diff' )
2562                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=next&oldid='.$oldid );
2563
2564                 $cdel='';
2565                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
2566                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
2567                         if( $revision->isCurrent() ) {
2568                         // We don't handle top deleted edits too well
2569                                 $cdel = wfMsgHtml('rev-delundel');
2570                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
2571                         // If revision was hidden from sysops
2572                                 $cdel = wfMsgHtml('rev-delundel');
2573                         } else {
2574                                 $cdel = $sk->makeKnownLinkObj( $revdel,
2575                                         wfMsgHtml('rev-delundel'),
2576                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
2577                                         '&oldid=' . urlencode( $oldid ) );
2578                                 // Bolden oversighted content
2579                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
2580                                         $cdel = "<strong>$cdel</strong>";
2581                         }
2582                         $cdel = "(<small>$cdel</small>) ";
2583                 }
2584
2585                 $userlinks = $sk->revUserTools( $revision, true );
2586
2587                 $m = wfMsg( 'revision-info-current' );
2588                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
2589                         ? 'revision-info-current'
2590                         : 'revision-info';
2591
2592                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsg( $infomsg, $td, $userlinks ) . "</div>\n" .
2593
2594                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsg( 'revision-nav', $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
2595                 $wgOut->setSubtitle( $r );
2596         }
2597
2598         /**
2599          * This function is called right before saving the wikitext,
2600          * so we can do things like signatures and links-in-context.
2601          *
2602          * @param string $text
2603          */
2604         function preSaveTransform( $text ) {
2605                 global $wgParser, $wgUser;
2606                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2607         }
2608
2609         /* Caching functions */
2610
2611         /**
2612          * checkLastModified returns true if it has taken care of all
2613          * output to the client that is necessary for this request.
2614          * (that is, it has sent a cached version of the page)
2615          */
2616         function tryFileCache() {
2617                 static $called = false;
2618                 if( $called ) {
2619                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2620                         return;
2621                 }
2622                 $called = true;
2623                 if($this->isFileCacheable()) {
2624                         $touched = $this->mTouched;
2625                         $cache = new HTMLFileCache( $this->mTitle );
2626                         if($cache->isFileCacheGood( $touched )) {
2627                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2628                                 $cache->loadFromFileCache();
2629                                 return true;
2630                         } else {
2631                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2632                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2633                         }
2634                 } else {
2635                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2636                 }
2637         }
2638
2639         /**
2640          * Check if the page can be cached
2641          * @return bool
2642          */
2643         function isFileCacheable() {
2644                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest, $wgLang, $wgContLang;
2645                 $action    = $wgRequest->getVal( 'action'    );
2646                 $oldid     = $wgRequest->getVal( 'oldid'     );
2647                 $diff      = $wgRequest->getVal( 'diff'      );
2648                 $redirect  = $wgRequest->getVal( 'redirect'  );
2649                 $printable = $wgRequest->getVal( 'printable' );
2650                 $page      = $wgRequest->getVal( 'page' );
2651
2652                 //check for non-standard user language; this covers uselang,
2653                 //and extensions for auto-detecting user language.
2654                 $ulang     = $wgLang->getCode();
2655                 $clang     = $wgContLang->getCode();
2656
2657                 $cacheable = $wgUseFileCache
2658                         && (!$wgShowIPinHeader)
2659                         && ($this->getID() != 0)
2660                         && ($wgUser->isAnon())
2661                         && (!$wgUser->getNewtalk())
2662                         && ($this->mTitle->getNamespace() != NS_SPECIAL )
2663                         && (empty( $action ) || $action == 'view')
2664                         && (!isset($oldid))
2665                         && (!isset($diff))
2666                         && (!isset($redirect))
2667                         && (!isset($printable))
2668                         && !isset($page)
2669                         && (!$this->mRedirectedFrom)
2670                         && ($ulang === $clang);
2671
2672                 if ( $cacheable ) {
2673                         //extension may have reason to disable file caching on some pages.
2674                         $cacheable = wfRunHooks( 'IsFileCacheable', array( $this ) );
2675                 }
2676
2677                 return $cacheable;
2678         }
2679
2680         /**
2681          * Loads page_touched and returns a value indicating if it should be used
2682          *
2683          */
2684         function checkTouched() {
2685                 if( !$this->mDataLoaded ) {
2686                         $this->loadPageData();
2687                 }
2688                 return !$this->mIsRedirect;
2689         }
2690
2691         /**
2692          * Get the page_touched field
2693          */
2694         function getTouched() {
2695                 # Ensure that page data has been loaded
2696                 if( !$this->mDataLoaded ) {
2697                         $this->loadPageData();
2698                 }
2699                 return $this->mTouched;
2700         }
2701
2702         /**
2703          * Get the page_latest field
2704          */
2705         function getLatest() {
2706                 if ( !$this->mDataLoaded ) {
2707                         $this->loadPageData();
2708                 }
2709                 return $this->mLatest;
2710         }
2711
2712         /**
2713          * Edit an article without doing all that other stuff
2714          * The article must already exist; link tables etc
2715          * are not updated, caches are not flushed.
2716          *
2717          * @param string $text text submitted
2718          * @param string $comment comment submitted
2719          * @param bool $minor whereas it's a minor modification
2720          */
2721         function quickEdit( $text, $comment = '', $minor = 0 ) {
2722                 wfProfileIn( __METHOD__ );
2723
2724                 $dbw = wfGetDB( DB_MASTER );
2725                 $dbw->begin();
2726                 $revision = new Revision( array(
2727                         'page'       => $this->getId(),
2728                         'text'       => $text,
2729                         'comment'    => $comment,
2730                         'minor_edit' => $minor ? 1 : 0,
2731                         ) );
2732                 $revision->insertOn( $dbw );
2733                 $this->updateRevisionOn( $dbw, $revision );
2734                 $dbw->commit();
2735
2736                 wfProfileOut( __METHOD__ );
2737         }
2738
2739         /**
2740          * Used to increment the view counter
2741          *
2742          * @static
2743          * @param integer $id article id
2744          */
2745         function incViewCount( $id ) {
2746                 $id = intval( $id );
2747                 global $wgHitcounterUpdateFreq, $wgDBtype;
2748
2749                 $dbw = wfGetDB( DB_MASTER );
2750                 $pageTable = $dbw->tableName( 'page' );
2751                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
2752                 $acchitsTable = $dbw->tableName( 'acchits' );
2753
2754                 if( $wgHitcounterUpdateFreq <= 1 ) {
2755                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
2756                         return;
2757                 }
2758
2759                 # Not important enough to warrant an error page in case of failure
2760                 $oldignore = $dbw->ignoreErrors( true );
2761
2762                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
2763
2764                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
2765                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
2766                         # Most of the time (or on SQL errors), skip row count check
2767                         $dbw->ignoreErrors( $oldignore );
2768                         return;
2769                 }
2770
2771                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
2772                 $row = $dbw->fetchObject( $res );
2773                 $rown = intval( $row->n );
2774                 if( $rown >= $wgHitcounterUpdateFreq ){
2775                         wfProfileIn( 'Article::incViewCount-collect' );
2776                         $old_user_abort = ignore_user_abort( true );
2777
2778                         if ($wgDBtype == 'mysql')
2779                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
2780                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
2781                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
2782                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
2783                                 'GROUP BY hc_id');
2784                         $dbw->query("DELETE FROM $hitcounterTable");
2785                         if ($wgDBtype == 'mysql') {
2786                                 $dbw->query('UNLOCK TABLES');
2787                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
2788                                         'WHERE page_id = hc_id');
2789                         }
2790                         else {
2791                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
2792                                         "FROM $acchitsTable WHERE page_id = hc_id");
2793                         }
2794                         $dbw->query("DROP TABLE $acchitsTable");
2795
2796                         ignore_user_abort( $old_user_abort );
2797                         wfProfileOut( 'Article::incViewCount-collect' );
2798                 }
2799                 $dbw->ignoreErrors( $oldignore );
2800         }
2801
2802         /**#@+
2803          * The onArticle*() functions are supposed to be a kind of hooks
2804          * which should be called whenever any of the specified actions
2805          * are done.
2806          *
2807          * This is a good place to put code to clear caches, for instance.
2808          *
2809          * This is called on page move and undelete, as well as edit
2810          * @static
2811          * @param $title_obj a title object
2812          */
2813
2814         static function onArticleCreate($title) {
2815                 # The talk page isn't in the regular link tables, so we need to update manually:
2816                 if ( $title->isTalkPage() ) {
2817                         $other = $title->getSubjectPage();
2818                 } else {
2819                         $other = $title->getTalkPage();
2820                 }
2821                 $other->invalidateCache();
2822                 $other->purgeSquid();
2823
2824                 $title->touchLinks();
2825                 $title->purgeSquid();
2826         }
2827
2828         static function onArticleDelete( $title ) {
2829                 global $wgUseFileCache, $wgMessageCache;
2830
2831                 $title->touchLinks();
2832                 $title->purgeSquid();
2833
2834                 # File cache
2835                 if ( $wgUseFileCache ) {
2836                         $cm = new HTMLFileCache( $title );
2837                         @unlink( $cm->fileCacheName() );
2838                 }
2839
2840                 if( $title->getNamespace() == NS_MEDIAWIKI) {
2841                         $wgMessageCache->replace( $title->getDBkey(), false );
2842                 }
2843         }
2844
2845         /**
2846          * Purge caches on page update etc
2847          */
2848         static function onArticleEdit( $title ) {
2849                 global $wgDeferredUpdateList, $wgUseFileCache;
2850
2851                 // Invalidate caches of articles which include this page
2852                 $update = new HTMLCacheUpdate( $title, 'templatelinks' );
2853                 $wgDeferredUpdateList[] = $update;
2854
2855                 # Purge squid for this page only
2856                 $title->purgeSquid();
2857
2858                 # Clear file cache
2859                 if ( $wgUseFileCache ) {
2860                         $cm = new HTMLFileCache( $title );
2861                         @unlink( $cm->fileCacheName() );
2862                 }
2863         }
2864
2865         /**#@-*/
2866
2867         /**
2868          * Info about this page
2869          * Called for ?action=info when $wgAllowPageInfo is on.
2870          *
2871          * @public
2872          */
2873         function info() {
2874                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
2875
2876                 if ( !$wgAllowPageInfo ) {
2877                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
2878                         return;
2879                 }
2880
2881                 $page = $this->mTitle->getSubjectPage();
2882
2883                 $wgOut->setPagetitle( $page->getPrefixedText() );
2884                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
2885                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ) );
2886
2887                 if( !$this->mTitle->exists() ) {
2888                         $wgOut->addHtml( '<div class="noarticletext">' );
2889                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2890                                 // This doesn't quite make sense; the user is asking for
2891                                 // information about the _page_, not the message... -- RC
2892                                 $wgOut->addHtml( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
2893                         } else {
2894                                 $msg = $wgUser->isLoggedIn()
2895                                         ? 'noarticletext'
2896                                         : 'noarticletextanon';
2897                                 $wgOut->addHtml( wfMsgExt( $msg, 'parse' ) );
2898                         }
2899                         $wgOut->addHtml( '</div>' );
2900                 } else {
2901                         $dbr = wfGetDB( DB_SLAVE );
2902                         $wl_clause = array(
2903                                 'wl_title'     => $page->getDBkey(),
2904                                 'wl_namespace' => $page->getNamespace() );
2905                         $numwatchers = $dbr->selectField(
2906                                 'watchlist',
2907                                 'COUNT(*)',
2908                                 $wl_clause,
2909                                 __METHOD__,
2910                                 $this->getSelectOptions() );
2911
2912                         $pageInfo = $this->pageCountInfo( $page );
2913                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
2914
2915                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
2916                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
2917                         if( $talkInfo ) {
2918                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
2919                         }
2920                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
2921                         if( $talkInfo ) {
2922                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
2923                         }
2924                         $wgOut->addHTML( '</ul>' );
2925
2926                 }
2927         }
2928
2929         /**
2930          * Return the total number of edits and number of unique editors
2931          * on a given page. If page does not exist, returns false.
2932          *
2933          * @param Title $title
2934          * @return array
2935          * @private
2936          */
2937         function pageCountInfo( $title ) {
2938                 $id = $title->getArticleId();
2939                 if( $id == 0 ) {
2940                         return false;
2941                 }
2942
2943                 $dbr = wfGetDB( DB_SLAVE );
2944
2945                 $rev_clause = array( 'rev_page' => $id );
2946
2947                 $edits = $dbr->selectField(
2948                         'revision',
2949                         'COUNT(rev_page)',
2950                         $rev_clause,
2951                         __METHOD__,
2952                         $this->getSelectOptions() );
2953
2954                 $authors = $dbr->selectField(
2955                         'revision',
2956                         'COUNT(DISTINCT rev_user_text)',
2957                         $rev_clause,
2958                         __METHOD__,
2959                         $this->getSelectOptions() );
2960
2961                 return array( 'edits' => $edits, 'authors' => $authors );
2962         }
2963
2964         /**
2965          * Return a list of templates used by this article.
2966          * Uses the templatelinks table
2967          *
2968          * @return array Array of Title objects
2969          */
2970         function getUsedTemplates() {
2971                 $result = array();
2972                 $id = $this->mTitle->getArticleID();
2973                 if( $id == 0 ) {
2974                         return array();
2975                 }
2976
2977                 $dbr = wfGetDB( DB_SLAVE );
2978                 $res = $dbr->select( array( 'templatelinks' ),
2979                         array( 'tl_namespace', 'tl_title' ),
2980                         array( 'tl_from' => $id ),
2981                         'Article:getUsedTemplates' );
2982                 if ( false !== $res ) {
2983                         if ( $dbr->numRows( $res ) ) {
2984                                 while ( $row = $dbr->fetchObject( $res ) ) {
2985                                         $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2986                                 }
2987                         }
2988                 }
2989                 $dbr->freeResult( $res );
2990                 return $result;
2991         }
2992
2993         /**
2994          * Return an auto-generated summary if the text provided is a redirect.
2995          *
2996          * @param  string $text The wikitext to check
2997          * @return string '' or an appropriate summary
2998          */
2999         public static function getRedirectAutosummary( $text ) {
3000                 $rt = Title::newFromRedirect( $text );
3001                 if( is_object( $rt ) )
3002                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3003                 else
3004                         return '';
3005         }
3006
3007         /**
3008          * Return an auto-generated summary if the new text is much shorter than
3009          * the old text.
3010          *
3011          * @param  string $oldtext The previous text of the page
3012          * @param  string $text    The submitted text of the page
3013          * @return string An appropriate autosummary, or an empty string.
3014          */
3015         public static function getBlankingAutosummary( $oldtext, $text ) {
3016                 if ($oldtext!='' && $text=='') {
3017                         return wfMsgForContent('autosumm-blank');
3018                 } elseif (strlen($oldtext) > 10 * strlen($text) && strlen($text) < 500) {
3019                         #Removing more than 90% of the article
3020                         global $wgContLang;
3021                         $truncatedtext = $wgContLang->truncate($text, max(0, 200 - strlen(wfMsgForContent('autosumm-replace'))), '...');
3022                         return wfMsgForContent('autosumm-replace', $truncatedtext);
3023                 } else {
3024                         return '';
3025                 }
3026         }
3027
3028         /**
3029         * Return an applicable autosummary if one exists for the given edit.
3030         * @param string $oldtext The previous text of the page.
3031         * @param string $newtext The submitted text of the page.
3032         * @param bitmask $flags A bitmask of flags submitted for the edit.
3033         * @return string An appropriate autosummary, or an empty string.
3034         */
3035         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3036
3037                 # This code is UGLY UGLY UGLY.
3038                 # Somebody PLEASE come up with a more elegant way to do it.
3039
3040                 #Redirect autosummaries
3041                 $summary = self::getRedirectAutosummary( $newtext );
3042
3043                 if ($summary)
3044                         return $summary;
3045
3046                 #Blanking autosummaries
3047                 if (!($flags & EDIT_NEW))
3048                         $summary = self::getBlankingAutosummary( $oldtext, $newtext );
3049
3050                 if ($summary)
3051                         return $summary;
3052
3053                 #New page autosummaries
3054                 if ($flags & EDIT_NEW && strlen($newtext)) {
3055                         #If they're making a new article, give its text, truncated, in the summary.
3056                         global $wgContLang;
3057                         $truncatedtext = $wgContLang->truncate(
3058                                 str_replace("\n", ' ', $newtext),
3059                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new') ) ),
3060                                 '...' );
3061                         $summary = wfMsgForContent( 'autosumm-new', $truncatedtext );
3062                 }
3063
3064                 if ($summary)
3065                         return $summary;
3066
3067                 return $summary;
3068         }
3069
3070         /**
3071          * Add the primary page-view wikitext to the output buffer
3072          * Saves the text into the parser cache if possible.
3073          * Updates templatelinks if it is out of date.
3074          *
3075          * @param string  $text
3076          * @param bool    $cache
3077          */
3078         public function outputWikiText( $text, $cache = true ) {
3079                 global $wgParser, $wgUser, $wgOut;
3080
3081                 $popts = $wgOut->parserOptions();
3082                 $popts->setTidy(true);
3083                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3084                         $popts, true, true, $this->getRevIdFetched() );
3085                 $popts->setTidy(false);
3086                 if ( $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3087                         $parserCache =& ParserCache::singleton();
3088                         $parserCache->save( $parserOutput, $this, $wgUser );
3089                 }
3090
3091                 if ( !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3092                         // templatelinks table may have become out of sync,
3093                         // especially if using variable-based transclusions.
3094                         // For paranoia, check if things have changed and if
3095                         // so apply updates to the database. This will ensure
3096                         // that cascaded protections apply as soon as the changes
3097                         // are visible.
3098
3099                         # Get templates from templatelinks
3100                         $id = $this->mTitle->getArticleID();
3101
3102                         $tlTemplates = array();
3103
3104                         $dbr = wfGetDB( DB_SLAVE );
3105                         $res = $dbr->select( array( 'templatelinks' ),
3106                                 array( 'tl_namespace', 'tl_title' ),
3107                                 array( 'tl_from' => $id ),
3108                                 'Article:getUsedTemplates' );
3109
3110                         global $wgContLang;
3111
3112                         if ( false !== $res ) {
3113                                 if ( $dbr->numRows( $res ) ) {
3114                                         while ( $row = $dbr->fetchObject( $res ) ) {
3115                                                 $tlTemplates[] = $wgContLang->getNsText( $row->tl_namespace ) . ':' . $row->tl_title ;
3116                                         }
3117                                 }
3118                         }
3119
3120                         # Get templates from parser output.
3121                         $poTemplates_allns = $parserOutput->getTemplates();
3122
3123                         $poTemplates = array ();
3124                         foreach ( $poTemplates_allns as $ns_templates ) {
3125                                 $poTemplates = array_merge( $poTemplates, $ns_templates );
3126                         }
3127
3128                         # Get the diff
3129                         $templates_diff = array_diff( $poTemplates, $tlTemplates );
3130
3131                         if ( count( $templates_diff ) > 0 ) {
3132                                 # Whee, link updates time.
3133                                 $u = new LinksUpdate( $this->mTitle, $parserOutput );
3134
3135                                 $dbw = wfGetDb( DB_MASTER );
3136                                 $dbw->begin();
3137
3138                                 $u->doUpdate();
3139
3140                                 $dbw->commit();
3141                         }
3142                 }
3143
3144                 $wgOut->addParserOutput( $parserOutput );
3145         }
3146
3147 }