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         const RATE_LIMITED = 8;
  51
  52         /**
  53          * Constructor and clear the article
  54          * @param $title Reference to a Title object.
  55          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  56          */
  57         function __construct( &$title, $oldId = null ) {
  58                 $this->mTitle =& $title;
  59                 $this->mOldId = $oldId;
  60                 $this->clear();
  61         }
  62
  63         /**
  64          * Tell the page view functions that this view was redirected
  65          * from another page on the wiki.
  66          * @param $from Title object.
  67          */
  68         function setRedirectedFrom( $from ) {
  69                 $this->mRedirectedFrom = $from;
  70         }
  71
  72         /**
  73          * @return mixed false, Title of in-wiki target, or string with URL
  74          */
  75         function followRedirect() {
  76                 $text = $this->getContent();
  77                 $rt = Title::newFromRedirect( $text );
  78
  79                 # process if title object is valid and not special:userlogout
  80                 if( $rt ) {
  81                         if( $rt->getInterwiki() != '' ) {
  82                                 if( $rt->isLocal() ) {
  83                                         // Offsite wikis need an HTTP redirect.
  84                                         //
  85                                         // This can be hard to reverse and may produce loops,
  86                                         // so they may be disabled in the site configuration.
  87
  88                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
  89                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
  90                                 }
  91                         } else {
  92                                 if( $rt->getNamespace() == NS_SPECIAL ) {
  93                                         // Gotta handle redirects to special pages differently:
  94                                         // Fill the HTTP response "Location" header and ignore
  95                                         // the rest of the page we're on.
  96                                         //
  97                                         // This can be hard to reverse, so they may be disabled.
  98
  99                                         if( $rt->isSpecial( 'Userlogout' ) ) {
 100                                                 // rolleyes
 101                                         } else {
 102                                                 return $rt->getFullURL();
 103                                         }
 104                                 }
 105                                 return $rt;
 106                         }
 107                 }
 108
 109                 // No or invalid redirect
 110                 return false;
 111         }
 112
 113         /**
 114          * get the title object of the article
 115          */
 116         function getTitle() {
 117                 return $this->mTitle;
 118         }
 119
 120         /**
 121           * Clear the object
 122           * @private
 123           */
 124         function clear() {
 125                 $this->mDataLoaded    = false;
 126                 $this->mContentLoaded = false;
 127
 128                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 129                 $this->mRedirectedFrom = null; # Title object if set
 130                 $this->mUserText =
 131                 $this->mTimestamp = $this->mComment = '';
 132                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 133                 $this->mTouched = '19700101000000';
 134                 $this->mForUpdate = false;
 135                 $this->mIsRedirect = false;
 136                 $this->mRevIdFetched = 0;
 137                 $this->mRedirectUrl = false;
 138                 $this->mLatest = false;
 139                 $this->mPreparedEdit = false;
 140         }
 141
 142         /**
 143          * Note that getContent/loadContent do not follow redirects anymore.
 144          * If you need to fetch redirectable content easily, try
 145          * the shortcut in Article::followContent()
 146          * FIXME
 147          * @todo There are still side-effects in this!
 148          *        In general, you should use the Revision class, not Article,
 149          *        to fetch text for purposes other than page views.
 150          *
 151          * @return Return the text of this revision
 152         */
 153         function getContent() {
 154                 global $wgUser, $wgOut;
 155
 156                 wfProfileIn( __METHOD__ );
 157
 158                 if ( 0 == $this->getID() ) {
 159                         wfProfileOut( __METHOD__ );
 160                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 161
 162                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 163                                 $ret = wfMsgWeirdKey ( $this->mTitle->getText() ) ;
 164                         } else {
 165                                 $ret = wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' );
 166                         }
 167
 168                         return "<div class='noarticletext'>$ret</div>";
 169                 } else {
 170                         $this->loadContent();
 171                         wfProfileOut( __METHOD__ );
 172                         return $this->mContent;
 173                 }
 174         }
 175
 176         /**
 177          * This function returns the text of a section, specified by a number ($section).
 178          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 179          * the first section before any such heading (section 0).
 180          *
 181          * If a section contains subsections, these are also returned.
 182          *
 183          * @param $text String: text to look in
 184          * @param $section Integer: section number
 185          * @return string text of the requested section
 186          * @deprecated
 187          */
 188         function getSection($text,$section) {
 189                 global $wgParser;
 190                 return $wgParser->getSection( $text, $section );
 191         }
 192
 193         /**
 194          * @return int The oldid of the article that is to be shown, 0 for the
 195          *             current revision
 196          */
 197         function getOldID() {
 198                 if ( is_null( $this->mOldId ) ) {
 199                         $this->mOldId = $this->getOldIDFromRequest();
 200                 }
 201                 return $this->mOldId;
 202         }
 203
 204         /**
 205          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 206          *
 207          * @return int The old id for the request
 208          */
 209         function getOldIDFromRequest() {
 210                 global $wgRequest;
 211                 $this->mRedirectUrl = false;
 212                 $oldid = $wgRequest->getVal( 'oldid' );
 213                 if ( isset( $oldid ) ) {
 214                         $oldid = intval( $oldid );
 215                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 216                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 217                                 if ( $nextid  ) {
 218                                         $oldid = $nextid;
 219                                 } else {
 220                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 221                                 }
 222                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 223                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 224                                 if ( $previd ) {
 225                                         $oldid = $previd;
 226                                 } else {
 227                                         # TODO
 228                                 }
 229                         }
 230                         # unused:
 231                         # $lastid = $oldid;
 232                 }
 233
 234                 if ( !$oldid ) {
 235                         $oldid = 0;
 236                 }
 237                 return $oldid;
 238         }
 239
 240         /**
 241          * Load the revision (including text) into this object
 242          */
 243         function loadContent() {
 244                 if ( $this->mContentLoaded ) return;
 245
 246                 # Query variables :P
 247                 $oldid = $this->getOldID();
 248
 249                 # Pre-fill content with error message so that if something
 250                 # fails we'll have something telling us what we intended.
 251                 $this->mOldId = $oldid;
 252                 $this->fetchContent( $oldid );
 253         }
 254
 255
 256         /**
 257          * Fetch a page record with the given conditions
 258          * @param Database $dbr
 259          * @param array    $conditions
 260          * @private
 261          */
 262         function pageData( $dbr, $conditions ) {
 263                 $fields = array(
 264                                 'page_id',
 265                                 'page_namespace',
 266                                 'page_title',
 267                                 'page_restrictions',
 268                                 'page_counter',
 269                                 'page_is_redirect',
 270                                 'page_is_new',
 271                                 'page_random',
 272                                 'page_touched',
 273                                 'page_latest',
 274                                 'page_len',
 275                 );
 276                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 277                 $row = $dbr->selectRow(
 278                         'page',
 279                         $fields,
 280                         $conditions,
 281                         __METHOD__
 282                 );
 283                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 284                 return $row ;
 285         }
 286
 287         /**
 288          * @param Database $dbr
 289          * @param Title $title
 290          */
 291         function pageDataFromTitle( $dbr, $title ) {
 292                 return $this->pageData( $dbr, array(
 293                         'page_namespace' => $title->getNamespace(),
 294                         'page_title'     => $title->getDBkey() ) );
 295         }
 296
 297         /**
 298          * @param Database $dbr
 299          * @param int $id
 300          */
 301         function pageDataFromId( $dbr, $id ) {
 302                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 303         }
 304
 305         /**
 306          * Set the general counter, title etc data loaded from
 307          * some source.
 308          *
 309          * @param object $data
 310          * @private
 311          */
 312         function loadPageData( $data = 'fromdb' ) {
 313                 if ( $data === 'fromdb' ) {
 314                         $dbr = $this->getDB();
 315                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 316                 }
 317
 318                 $lc =& LinkCache::singleton();
 319                 if ( $data ) {
 320                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle );
 321
 322                         $this->mTitle->mArticleID = $data->page_id;
 323
 324                         # Old-fashioned restrictions.
 325                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 326
 327                         $this->mCounter     = $data->page_counter;
 328                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 329                         $this->mIsRedirect  = $data->page_is_redirect;
 330                         $this->mLatest      = $data->page_latest;
 331                 } else {
 332                         if ( is_object( $this->mTitle ) ) {
 333                                 $lc->addBadLinkObj( $this->mTitle );
 334                         }
 335                         $this->mTitle->mArticleID = 0;
 336                 }
 337
 338                 $this->mDataLoaded  = true;
 339         }
 340
 341         /**
 342          * Get text of an article from database
 343          * Does *NOT* follow redirects.
 344          * @param int $oldid 0 for whatever the latest revision is
 345          * @return string
 346          */
 347         function fetchContent( $oldid = 0 ) {
 348                 if ( $this->mContentLoaded ) {
 349                         return $this->mContent;
 350                 }
 351
 352                 $dbr = $this->getDB();
 353
 354                 # Pre-fill content with error message so that if something
 355                 # fails we'll have something telling us what we intended.
 356                 $t = $this->mTitle->getPrefixedText();
 357                 if( $oldid ) {
 358                         $t .= ',oldid='.$oldid;
 359                 }
 360                 $this->mContent = wfMsg( 'missingarticle', $t ) ;
 361
 362                 if( $oldid ) {
 363                         $revision = Revision::newFromId( $oldid );
 364                         if( is_null( $revision ) ) {
 365                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 366                                 return false;
 367                         }
 368                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 369                         if( !$data ) {
 370                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 371                                 return false;
 372                         }
 373                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 374                         $this->loadPageData( $data );
 375                 } else {
 376                         if( !$this->mDataLoaded ) {
 377                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 378                                 if( !$data ) {
 379                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 380                                         return false;
 381                                 }
 382                                 $this->loadPageData( $data );
 383                         }
 384                         $revision = Revision::newFromId( $this->mLatest );
 385                         if( is_null( $revision ) ) {
 386                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$data->page_latest}\n" );
 387                                 return false;
 388                         }
 389                 }
 390
 391                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 392                 // We should instead work with the Revision object when we need it...
 393                 $this->mContent = $revision->userCan( Revision::DELETED_TEXT ) ? $revision->getRawText() : "";
 394                 //$this->mContent   = $revision->getText();
 395
 396                 $this->mUser      = $revision->getUser();
 397                 $this->mUserText  = $revision->getUserText();
 398                 $this->mComment   = $revision->getComment();
 399                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 400
 401                 $this->mRevIdFetched = $revision->getID();
 402                 $this->mContentLoaded = true;
 403                 $this->mRevision =& $revision;
 404
 405                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 406
 407                 return $this->mContent;
 408         }
 409
 410         /**
 411          * Read/write accessor to select FOR UPDATE
 412          *
 413          * @param $x Mixed: FIXME
 414          */
 415         function forUpdate( $x = NULL ) {
 416                 return wfSetVar( $this->mForUpdate, $x );
 417         }
 418
 419         /**
 420          * Get the database which should be used for reads
 421          *
 422          * @return Database
 423          */
 424         function getDB() {
 425                 return wfGetDB( DB_MASTER );
 426         }
 427
 428         /**
 429          * Get options for all SELECT statements
 430          *
 431          * @param $options Array: an optional options array which'll be appended to
 432          *                       the default
 433          * @return Array: options
 434          */
 435         function getSelectOptions( $options = '' ) {
 436                 if ( $this->mForUpdate ) {
 437                         if ( is_array( $options ) ) {
 438                                 $options[] = 'FOR UPDATE';
 439                         } else {
 440                                 $options = 'FOR UPDATE';
 441                         }
 442                 }
 443                 return $options;
 444         }
 445
 446         /**
 447          * @return int Page ID
 448          */
 449         function getID() {
 450                 if( $this->mTitle ) {
 451                         return $this->mTitle->getArticleID();
 452                 } else {
 453                         return 0;
 454                 }
 455         }
 456
 457         /**
 458          * @return bool Whether or not the page exists in the database
 459          */
 460         function exists() {
 461                 return $this->getId() != 0;
 462         }
 463
 464         /**
 465          * @return int The view count for the page
 466          */
 467         function getCount() {
 468                 if ( -1 == $this->mCounter ) {
 469                         $id = $this->getID();
 470                         if ( $id == 0 ) {
 471                                 $this->mCounter = 0;
 472                         } else {
 473                                 $dbr = wfGetDB( DB_SLAVE );
 474                                 $this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
 475                                         'Article::getCount', $this->getSelectOptions() );
 476                         }
 477                 }
 478                 return $this->mCounter;
 479         }
 480
 481         /**
 482          * Determine whether a page  would be suitable for being counted as an
 483          * article in the site_stats table based on the title & its content
 484          *
 485          * @param $text String: text to analyze
 486          * @return bool
 487          */
 488         function isCountable( $text ) {
 489                 global $wgUseCommaCount;
 490
 491                 $token = $wgUseCommaCount ? ',' : '[[';
 492                 return
 493                         $this->mTitle->isContentPage()
 494                         && !$this->isRedirect( $text )
 495                         && in_string( $token, $text );
 496         }
 497
 498         /**
 499          * Tests if the article text represents a redirect
 500          *
 501          * @param $text String: FIXME
 502          * @return bool
 503          */
 504         function isRedirect( $text = false ) {
 505                 if ( $text === false ) {
 506                         $this->loadContent();
 507                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 508                 } else {
 509                         $titleObj = Title::newFromRedirect( $text );
 510                 }
 511                 return $titleObj !== NULL;
 512         }
 513
 514         /**
 515          * Returns true if the currently-referenced revision is the current edit
 516          * to this page (and it exists).
 517          * @return bool
 518          */
 519         function isCurrent() {
 520                 # If no oldid, this is the current version.
 521                 if ($this->getOldID() == 0)
 522                         return true;
 523
 524                 return $this->exists() &&
 525                         isset( $this->mRevision ) &&
 526                         $this->mRevision->isCurrent();
 527         }
 528
 529         /**
 530          * Loads everything except the text
 531          * This isn't necessary for all uses, so it's only done if needed.
 532          * @private
 533          */
 534         function loadLastEdit() {
 535                 if ( -1 != $this->mUser )
 536                         return;
 537
 538                 # New or non-existent articles have no user information
 539                 $id = $this->getID();
 540                 if ( 0 == $id ) return;
 541
 542                 $this->mLastRevision = Revision::loadFromPageId( $this->getDB(), $id );
 543                 if( !is_null( $this->mLastRevision ) ) {
 544                         $this->mUser      = $this->mLastRevision->getUser();
 545                         $this->mUserText  = $this->mLastRevision->getUserText();
 546                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 547                         $this->mComment   = $this->mLastRevision->getComment();
 548                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 549                         $this->mRevIdFetched = $this->mLastRevision->getID();
 550                 }
 551         }
 552
 553         function getTimestamp() {
 554                 // Check if the field has been filled by ParserCache::get()
 555                 if ( !$this->mTimestamp ) {
 556                         $this->loadLastEdit();
 557                 }
 558                 return wfTimestamp(TS_MW, $this->mTimestamp);
 559         }
 560
 561         function getUser() {
 562                 $this->loadLastEdit();
 563                 return $this->mUser;
 564         }
 565
 566         function getUserText() {
 567                 $this->loadLastEdit();
 568                 return $this->mUserText;
 569         }
 570
 571         function getComment() {
 572                 $this->loadLastEdit();
 573                 return $this->mComment;
 574         }
 575
 576         function getMinorEdit() {
 577                 $this->loadLastEdit();
 578                 return $this->mMinorEdit;
 579         }
 580
 581         function getRevIdFetched() {
 582                 $this->loadLastEdit();
 583                 return $this->mRevIdFetched;
 584         }
 585
 586         /**
 587          * @todo Document, fixme $offset never used.
 588          * @param $limit Integer: default 0.
 589          * @param $offset Integer: default 0.
 590          */
 591         function getContributors($limit = 0, $offset = 0) {
 592                 # XXX: this is expensive; cache this info somewhere.
 593
 594                 $contribs = array();
 595                 $dbr = wfGetDB( DB_SLAVE );
 596                 $revTable = $dbr->tableName( 'revision' );
 597                 $userTable = $dbr->tableName( 'user' );
 598                 $user = $this->getUser();
 599                 $pageId = $this->getId();
 600
 601                 $sql = "SELECT rev_user, rev_user_text, user_real_name, MAX(rev_timestamp) as timestamp
 602                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 603                         WHERE rev_page = $pageId
 604                         AND rev_user != $user
 605                         GROUP BY rev_user, rev_user_text, user_real_name
 606                         ORDER BY timestamp DESC";
 607
 608                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 609                 $sql .= ' '. $this->getSelectOptions();
 610
 611                 $res = $dbr->query($sql, __METHOD__);
 612
 613                 while ( $line = $dbr->fetchObject( $res ) ) {
 614                         $contribs[] = array($line->rev_user, $line->rev_user_text, $line->user_real_name);
 615                 }
 616
 617                 $dbr->freeResult($res);
 618                 return $contribs;
 619         }
 620
 621         /**
 622          * This is the default action of the script: just view the page of
 623          * the given title.
 624         */
 625         function view() {
 626                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 627                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 628                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 629                 $sk = $wgUser->getSkin();
 630
 631                 wfProfileIn( __METHOD__ );
 632
 633                 $parserCache =& ParserCache::singleton();
 634                 $ns = $this->mTitle->getNamespace(); # shortcut
 635
 636                 # Get variables from query string
 637                 $oldid = $this->getOldID();
 638
 639                 # getOldID may want us to redirect somewhere else
 640                 if ( $this->mRedirectUrl ) {
 641                         $wgOut->redirect( $this->mRedirectUrl );
 642                         wfProfileOut( __METHOD__ );
 643                         return;
 644                 }
 645
 646                 $diff = $wgRequest->getVal( 'diff' );
 647                 $rcid = $wgRequest->getVal( 'rcid' );
 648                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 649                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 650                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 651
 652                 $wgOut->setArticleFlag( true );
 653
 654                 # Discourage indexing of printable versions, but encourage following
 655                 if( $wgOut->isPrintable() ) {
 656                         $policy = 'noindex,follow';
 657                 } elseif ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 658                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 659                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 660                         # Honour customised robot policies for this namespace
 661                         $policy = $wgNamespaceRobotPolicies[$ns];
 662                 } else {
 663                         # Default to encourage indexing and following links
 664                         $policy = 'index,follow';
 665                 }
 666                 $wgOut->setRobotPolicy( $policy );
 667
 668                 # If we got diff and oldid in the query, we want to see a
 669                 # diff page instead of the article.
 670
 671                 if ( !is_null( $diff ) ) {
 672                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 673
 674                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge );
 675                         // DifferenceEngine directly fetched the revision:
 676                         $this->mRevIdFetched = $de->mNewid;
 677                         $de->showDiffPage( $diffOnly );
 678
 679                         // Needed to get the page's current revision
 680                         $this->loadPageData();
 681                         if( $diff == 0 || $diff == $this->mLatest ) {
 682                                 # Run view updates for current revision only
 683                                 $this->viewUpdates();
 684                         }
 685                         wfProfileOut( __METHOD__ );
 686                         return;
 687                 }
 688
 689                 if ( empty( $oldid ) && $this->checkTouched() ) {
 690                         $wgOut->setETag($parserCache->getETag($this, $wgUser));
 691
 692                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 693                                 wfProfileOut( __METHOD__ );
 694                                 return;
 695                         } else if ( $this->tryFileCache() ) {
 696                                 # tell wgOut that output is taken care of
 697                                 $wgOut->disable();
 698                                 $this->viewUpdates();
 699                                 wfProfileOut( __METHOD__ );
 700                                 return;
 701                         }
 702                 }
 703
 704                 # Should the parser cache be used?
 705                 $pcache = $wgEnableParserCache
 706                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
 707                         && $this->exists()
 708                         && empty( $oldid )
 709                         && !$this->mTitle->isCssOrJsPage()
 710                         && !$this->mTitle->isCssJsSubpage();
 711                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 712                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 713                         wfIncrStats( 'pcache_miss_stub' );
 714                 }
 715
 716                 $wasRedirected = false;
 717                 if ( isset( $this->mRedirectedFrom ) ) {
 718                         // This is an internally redirected page view.
 719                         // We'll need a backlink to the source page for navigation.
 720                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 721                                 $sk = $wgUser->getSkin();
 722                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 723                                 $s = wfMsg( 'redirectedfrom', $redir );
 724                                 $wgOut->setSubtitle( $s );
 725
 726                                 // Set the fragment if one was specified in the redirect
 727                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
 728                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 729                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 730                                 }
 731                                 $wasRedirected = true;
 732                         }
 733                 } elseif ( !empty( $rdfrom ) ) {
 734                         // This is an externally redirected view, from some other wiki.
 735                         // If it was reported from a trusted site, supply a backlink.
 736                         global $wgRedirectSources;
 737                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 738                                 $sk = $wgUser->getSkin();
 739                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 740                                 $s = wfMsg( 'redirectedfrom', $redir );
 741                                 $wgOut->setSubtitle( $s );
 742                                 $wasRedirected = true;
 743                         }
 744                 }
 745
 746                 $outputDone = false;
 747                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 748                 if ( $pcache ) {
 749                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 750                                 // Ensure that UI elements requiring revision ID have
 751                                 // the correct version information.
 752                                 $wgOut->setRevisionId( $this->mLatest );
 753                                 $outputDone = true;
 754                         }
 755                 }
 756                 if ( !$outputDone ) {
 757                         $text = $this->getContent();
 758                         if ( $text === false ) {
 759                                 # Failed to load, replace text with error message
 760                                 $t = $this->mTitle->getPrefixedText();
 761                                 if( $oldid ) {
 762                                         $t .= ',oldid='.$oldid;
 763                                         $text = wfMsg( 'missingarticle', $t );
 764                                 } else {
 765                                         $text = wfMsg( 'noarticletext', $t );
 766                                 }
 767                         }
 768
 769                         # Another whitelist check in case oldid is altering the title
 770                         if ( !$this->mTitle->userCanRead() ) {
 771                                 $wgOut->loginToUse();
 772                                 $wgOut->output();
 773                                 exit;
 774                         }
 775
 776                         # We're looking at an old revision
 777
 778                         if ( !empty( $oldid ) ) {
 779                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 780                                 if( is_null( $this->mRevision ) ) {
 781                                         // FIXME: This would be a nice place to load the 'no such page' text.
 782                                 } else {
 783                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 784                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 785                                                 if( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 786                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-permission' ) );
 787                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 788                                                         return;
 789                                                 } else {
 790                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-view' ) );
 791                                                         // and we are allowed to see...
 792                                                 }
 793                                         }
 794                                 }
 795
 796                         }
 797                 }
 798                 if( !$outputDone ) {
 799                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 800
 801                          // Pages containing custom CSS or JavaScript get special treatment
 802                         if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 803                                 $wgOut->addHtml( wfMsgExt( 'clearyourcache', 'parse' ) );
 804
 805                                 // Give hooks a chance to customise the output
 806                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 807                                         // Wrap the whole lot in a <pre> and don't parse
 808                                         $m = array();
 809                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 810                                         $wgOut->addHtml( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 811                                         $wgOut->addHtml( htmlspecialchars( $this->mContent ) );
 812                                         $wgOut->addHtml( "\n</pre>\n" );
 813                                 }
 814
 815                         }
 816
 817                         elseif ( $rt = Title::newFromRedirect( $text ) ) {
 818                                 # Display redirect
 819                                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 820                                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 821                                 # Don't overwrite the subtitle if this was an old revision
 822                                 if( !$wasRedirected && $this->isCurrent() ) {
 823                                         $wgOut->setSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 824                                 }
 825                                 $link = $sk->makeLinkObj( $rt, $rt->getFullText() );
 826
 827                                 $wgOut->addHTML( '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
 828                                   '<span class="redirectText">'.$link.'</span>' );
 829
 830                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 831                                 $wgOut->addParserOutputNoText( $parseout );
 832                         } else if ( $pcache ) {
 833                                 # Display content and save to parser cache
 834                                 $this->outputWikiText( $text );
 835                         } else {
 836                                 # Display content, don't attempt to save to parser cache
 837                                 # Don't show section-edit links on old revisions... this way lies madness.
 838                                 if( !$this->isCurrent() ) {
 839                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 840                                 }
 841                                 # Display content and don't save to parser cache
 842                                 # With timing hack -- TS 2006-07-26
 843                                 $time = -wfTime();
 844                                 $this->outputWikiText( $text, false );
 845                                 $time += wfTime();
 846
 847                                 # Timing hack
 848                                 if ( $time > 3 ) {
 849                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 850                                                 $this->mTitle->getPrefixedDBkey()));
 851                                 }
 852
 853                                 if( !$this->isCurrent() ) {
 854                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 855                                 }
 856
 857                         }
 858                 }
 859                 /* title may have been set from the cache */
 860                 $t = $wgOut->getPageTitle();
 861                 if( empty( $t ) ) {
 862                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 863                 }
 864
 865                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 866                 if( $ns == NS_USER_TALK &&
 867                         User::isIP( $this->mTitle->getText() ) ) {
 868                         $wgOut->addWikiText( wfMsg('anontalkpagetext') );
 869                 }
 870
 871                 # If we have been passed an &rcid= parameter, we want to give the user a
 872                 # chance to mark this new article as patrolled.
 873                 if( !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) && $this->mTitle->exists() ) {
 874                         $wgOut->addHTML(
 875                                 "<div class='patrollink'>" .
 876                                         wfMsgHtml( 'markaspatrolledlink',
 877                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
 878                                                 "action=markpatrolled&rcid=$rcid" )
 879                                         ) .
 880                                 '</div>'
 881                          );
 882                 }
 883
 884                 # Trackbacks
 885                 if ($wgUseTrackbacks)
 886                         $this->addTrackbacks();
 887
 888                 $this->viewUpdates();
 889                 wfProfileOut( __METHOD__ );
 890         }
 891
 892         function addTrackbacks() {
 893                 global $wgOut, $wgUser;
 894
 895                 $dbr = wfGetDB(DB_SLAVE);
 896                 $tbs = $dbr->select(
 897                                 /* FROM   */ 'trackbacks',
 898                                 /* SELECT */ array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
 899                                 /* WHERE  */ array('tb_page' => $this->getID())
 900                 );
 901
 902                 if (!$dbr->numrows($tbs))
 903                         return;
 904
 905                 $tbtext = "";
 906                 while ($o = $dbr->fetchObject($tbs)) {
 907                         $rmvtxt = "";
 908                         if ($wgUser->isAllowed( 'trackback' )) {
 909                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid="
 910                                                 . $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
 911                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
 912                         }
 913                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
 914                                         $o->tb_title,
 915                                         $o->tb_url,
 916                                         $o->tb_ex,
 917                                         $o->tb_name,
 918                                         $rmvtxt);
 919                 }
 920                 $wgOut->addWikitext(wfMsg('trackbackbox', $tbtext));
 921         }
 922
 923         function deletetrackback() {
 924                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
 925
 926                 if (!$wgUser->matchEditToken($wgRequest->getVal('token'))) {
 927                         $wgOut->addWikitext(wfMsg('sessionfailure'));
 928                         return;
 929                 }
 930
 931                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
 932
 933                 if (count($permission_errors)>0)
 934                 {
 935                         $wgOut->showPermissionsErrorPage( $permission_errors );
 936                         return;
 937                 }
 938
 939                 $db = wfGetDB(DB_MASTER);
 940                 $db->delete('trackbacks', array('tb_id' => $wgRequest->getInt('tbid')));
 941                 $wgTitle->invalidateCache();
 942                 $wgOut->addWikiText(wfMsg('trackbackdeleteok'));
 943         }
 944
 945         function render() {
 946                 global $wgOut;
 947
 948                 $wgOut->setArticleBodyOnly(true);
 949                 $this->view();
 950         }
 951
 952         /**
 953          * Handle action=purge
 954          */
 955         function purge() {
 956                 global $wgUser, $wgRequest, $wgOut;
 957
 958                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
 959                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
 960                                 $this->doPurge();
 961                         }
 962                 } else {
 963                         $msg = $wgOut->parse( wfMsg( 'confirm_purge' ) );
 964                         $action = htmlspecialchars( $_SERVER['REQUEST_URI'] );
 965                         $button = htmlspecialchars( wfMsg( 'confirm_purge_button' ) );
 966                         $msg = str_replace( '$1',
 967                                 "<form method=\"post\" action=\"$action\">\n" .
 968                                 "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
 969                                 "</form>\n", $msg );
 970
 971                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 972                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 973                         $wgOut->addHTML( $msg );
 974                 }
 975         }
 976
 977         /**
 978          * Perform the actions of a page purging
 979          */
 980         function doPurge() {
 981                 global $wgUseSquid;
 982                 // Invalidate the cache
 983                 $this->mTitle->invalidateCache();
 984
 985                 if ( $wgUseSquid ) {
 986                         // Commit the transaction before the purge is sent
 987                         $dbw = wfGetDB( DB_MASTER );
 988                         $dbw->immediateCommit();
 989
 990                         // Send purge
 991                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 992                         $update->doUpdate();
 993                 }
 994                 $this->view();
 995         }
 996
 997         /**
 998          * Insert a new empty page record for this article.
 999          * This *must* be followed up by creating a revision
1000          * and running $this->updateToLatest( $rev_id );
1001          * or else the record will be left in a funky state.
1002          * Best if all done inside a transaction.
1003          *
1004          * @param Database $dbw
1005          * @return int     The newly created page_id key
1006          * @private
1007          */
1008         function insertOn( $dbw ) {
1009                 wfProfileIn( __METHOD__ );
1010
1011                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1012                 $dbw->insert( 'page', array(
1013                         'page_id'           => $page_id,
1014                         'page_namespace'    => $this->mTitle->getNamespace(),
1015                         'page_title'        => $this->mTitle->getDBkey(),
1016                         'page_counter'      => 0,
1017                         'page_restrictions' => '',
1018                         'page_is_redirect'  => 0, # Will set this shortly...
1019                         'page_is_new'       => 1,
1020                         'page_random'       => wfRandom(),
1021                         'page_touched'      => $dbw->timestamp(),
1022                         'page_latest'       => 0, # Fill this in shortly...
1023                         'page_len'          => 0, # Fill this in shortly...
1024                 ), __METHOD__ );
1025                 $newid = $dbw->insertId();
1026
1027                 $this->mTitle->resetArticleId( $newid );
1028
1029                 wfProfileOut( __METHOD__ );
1030                 return $newid;
1031         }
1032
1033         /**
1034          * Update the page record to point to a newly saved revision.
1035          *
1036          * @param Database $dbw
1037          * @param Revision $revision For ID number, and text used to set
1038                                      length and redirect status fields
1039          * @param int $lastRevision If given, will not overwrite the page field
1040          *                          when different from the currently set value.
1041          *                          Giving 0 indicates the new page flag should
1042          *                          be set on.
1043          * @param bool $lastRevIsRedirect If given, will optimize adding and
1044          *                                                      removing rows in redirect table.
1045          * @return bool true on success, false on failure
1046          * @private
1047          */
1048         function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1049                 wfProfileIn( __METHOD__ );
1050
1051                 $text = $revision->getText();
1052                 $rt = Title::newFromRedirect( $text );
1053
1054                 $conditions = array( 'page_id' => $this->getId() );
1055                 if( !is_null( $lastRevision ) ) {
1056                         # An extra check against threads stepping on each other
1057                         $conditions['page_latest'] = $lastRevision;
1058                 }
1059
1060                 $dbw->update( 'page',
1061                         array( /* SET */
1062                                 'page_latest'      => $revision->getId(),
1063                                 'page_touched'     => $dbw->timestamp(),
1064                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1065                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1066                                 'page_len'         => strlen( $text ),
1067                         ),
1068                         $conditions,
1069                         __METHOD__ );
1070
1071                 $result = $dbw->affectedRows() != 0;
1072
1073                 if ($result) {
1074                         // FIXME: Should the result from updateRedirectOn() be returned instead?
1075                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1076                 }
1077
1078                 wfProfileOut( __METHOD__ );
1079                 return $result;
1080         }
1081
1082         /**
1083          * Add row to the redirect table if this is a redirect, remove otherwise.
1084          *
1085          * @param Database $dbw
1086          * @param $redirectTitle a title object pointing to the redirect target,
1087          *                                                      or NULL if this is not a redirect
1088          * @param bool $lastRevIsRedirect If given, will optimize adding and
1089          *                                                      removing rows in redirect table.
1090          * @return bool true on success, false on failure
1091          * @private
1092          */
1093         function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1094
1095                 // Always update redirects (target link might have changed)
1096                 // Update/Insert if we don't know if the last revision was a redirect or not
1097                 // Delete if changing from redirect to non-redirect
1098                 $isRedirect = !is_null($redirectTitle);
1099                 if ($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1100
1101                         wfProfileIn( __METHOD__ );
1102
1103                         if ($isRedirect) {
1104
1105                                 // This title is a redirect, Add/Update row in the redirect table
1106                                 $set = array( /* SET */
1107                                         'rd_namespace' => $redirectTitle->getNamespace(),
1108                                         'rd_title'     => $redirectTitle->getDBkey(),
1109                                         'rd_from'      => $this->getId(),
1110                                 );
1111
1112                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1113                         } else {
1114                                 // This is not a redirect, remove row from redirect table
1115                                 $where = array( 'rd_from' => $this->getId() );
1116                                 $dbw->delete( 'redirect', $where, __METHOD__);
1117                         }
1118
1119                         wfProfileOut( __METHOD__ );
1120                         return ( $dbw->affectedRows() != 0 );
1121                 }
1122
1123                 return true;
1124         }
1125
1126         /**
1127          * If the given revision is newer than the currently set page_latest,
1128          * update the page record. Otherwise, do nothing.
1129          *
1130          * @param Database $dbw
1131          * @param Revision $revision
1132          */
1133         function updateIfNewerOn( &$dbw, $revision ) {
1134                 wfProfileIn( __METHOD__ );
1135
1136                 $row = $dbw->selectRow(
1137                         array( 'revision', 'page' ),
1138                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1139                         array(
1140                                 'page_id' => $this->getId(),
1141                                 'page_latest=rev_id' ),
1142                         __METHOD__ );
1143                 if( $row ) {
1144                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1145                                 wfProfileOut( __METHOD__ );
1146                                 return false;
1147                         }
1148                         $prev = $row->rev_id;
1149                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1150                 } else {
1151                         # No or missing previous revision; mark the page as new
1152                         $prev = 0;
1153                         $lastRevIsRedirect = null;
1154                 }
1155
1156                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1157                 wfProfileOut( __METHOD__ );
1158                 return $ret;
1159         }
1160
1161         /**
1162          * @return string Complete article text, or null if error
1163          */
1164         function replaceSection($section, $text, $summary = '', $edittime = NULL) {
1165                 wfProfileIn( __METHOD__ );
1166
1167                 if( $section == '' ) {
1168                         // Whole-page edit; let the text through unmolested.
1169                 } else {
1170                         if( is_null( $edittime ) ) {
1171                                 $rev = Revision::newFromTitle( $this->mTitle );
1172                         } else {
1173                                 $dbw = wfGetDB( DB_MASTER );
1174                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1175                         }
1176                         if( is_null( $rev ) ) {
1177                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1178                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1179                                 return null;
1180                         }
1181                         $oldtext = $rev->getText();
1182
1183                         if( $section == 'new' ) {
1184                                 # Inserting a new section
1185                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1186                                 $text = strlen( trim( $oldtext ) ) > 0
1187                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1188                                                 : "{$subject}{$text}";
1189                         } else {
1190                                 # Replacing an existing section; roll out the big guns
1191                                 global $wgParser;
1192                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1193                         }
1194
1195                 }
1196
1197                 wfProfileOut( __METHOD__ );
1198                 return $text;
1199         }
1200
1201         /**
1202          * @deprecated use Article::doEdit()
1203          */
1204         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false ) {
1205                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1206                         ( $isminor ? EDIT_MINOR : 0 ) |
1207                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 );
1208
1209                 # If this is a comment, add the summary as headline
1210                 if ( $comment && $summary != "" ) {
1211                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1212                 }
1213
1214                 $this->doEdit( $text, $summary, $flags );
1215
1216                 $dbw = wfGetDB( DB_MASTER );
1217                 if ($watchthis) {
1218                         if (!$this->mTitle->userIsWatching()) {
1219                                 $dbw->begin();
1220                                 $this->doWatch();
1221                                 $dbw->commit();
1222                         }
1223                 } else {
1224                         if ( $this->mTitle->userIsWatching() ) {
1225                                 $dbw->begin();
1226                                 $this->doUnwatch();
1227                                 $dbw->commit();
1228                         }
1229                 }
1230                 $this->doRedirect( $this->isRedirect( $text ) );
1231         }
1232
1233         /**
1234          * @deprecated use Article::doEdit()
1235          */
1236         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1237                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1238                         ( $minor ? EDIT_MINOR : 0 ) |
1239                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1240
1241                 $good = $this->doEdit( $text, $summary, $flags );
1242                 if ( $good ) {
1243                         $dbw = wfGetDB( DB_MASTER );
1244                         if ($watchthis) {
1245                                 if (!$this->mTitle->userIsWatching()) {
1246                                         $dbw->begin();
1247                                         $this->doWatch();
1248                                         $dbw->commit();
1249                                 }
1250                         } else {
1251                                 if ( $this->mTitle->userIsWatching() ) {
1252                                         $dbw->begin();
1253                                         $this->doUnwatch();
1254                                         $dbw->commit();
1255                                 }
1256                         }
1257
1258                         $extraq = ''; // Give extensions a chance to modify URL query on update
1259                         wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraq ) );
1260
1261                         $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraq );
1262                 }
1263                 return $good;
1264         }
1265
1266         /**
1267          * Article::doEdit()
1268          *
1269          * Change an existing article or create a new article. Updates RC and all necessary caches,
1270          * optionally via the deferred update array.
1271          *
1272          * $wgUser must be set before calling this function.
1273          *
1274          * @param string $text New text
1275          * @param string $summary Edit summary
1276          * @param integer $flags bitfield:
1277          *      EDIT_NEW
1278          *          Article is known or assumed to be non-existent, create a new one
1279          *      EDIT_UPDATE
1280          *          Article is known or assumed to be pre-existing, update it
1281          *      EDIT_MINOR
1282          *          Mark this edit minor, if the user is allowed to do so
1283          *      EDIT_SUPPRESS_RC
1284          *          Do not log the change in recentchanges
1285          *      EDIT_FORCE_BOT
1286          *          Mark the edit a "bot" edit regardless of user rights
1287          *      EDIT_DEFER_UPDATES
1288          *          Defer some of the updates until the end of index.php
1289          *      EDIT_AUTOSUMMARY
1290          *          Fill in blank summaries with generated text where possible
1291          *
1292          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1293          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return false. If
1294          * EDIT_NEW is specified and the article does exist, a duplicate key error will cause an exception
1295          * to be thrown from the Database. These two conditions are also possible with auto-detection due
1296          * to MediaWiki's performance-optimised locking strategy.
1297          *
1298          * @return bool success
1299          */
1300         function doEdit( $text, $summary, $flags = 0 ) {
1301                 global $wgUser, $wgDBtransactions, $wgRequest;
1302
1303                 wfProfileIn( __METHOD__ );
1304                 $good = true;
1305
1306                 if ( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1307                         $aid = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
1308                         if ( $aid ) {
1309                                 $flags |= EDIT_UPDATE;
1310                         } else {
1311                                 $flags |= EDIT_NEW;
1312                         }
1313                 }
1314
1315                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1316                         &$summary, $flags & EDIT_MINOR,
1317                         null, null, &$flags ) ) )
1318                 {
1319                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1320                         wfProfileOut( __METHOD__ );
1321                         return false;
1322                 }
1323
1324                 # Silently ignore EDIT_MINOR if not allowed
1325                 $isminor = ( $flags & EDIT_MINOR ) && $wgUser->isAllowed('minoredit');
1326                 $bot = ( $wgUser->isAllowed( 'bot' ) ? $wgRequest->getBool( 'bot' , true ) : 0 ) || ( $flags & EDIT_FORCE_BOT );
1327
1328                 $oldtext = $this->getContent();
1329                 $oldsize = strlen( $oldtext );
1330
1331                 # Provide autosummaries if one is not provided.
1332                 if ($flags & EDIT_AUTOSUMMARY && $summary == '')
1333                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1334
1335                 $editInfo = $this->prepareTextForEdit( $text );
1336                 $text = $editInfo->pst;
1337                 $newsize = strlen( $text );
1338
1339                 $dbw = wfGetDB( DB_MASTER );
1340                 $now = wfTimestampNow();
1341
1342                 if ( $flags & EDIT_UPDATE ) {
1343                         # Update article, but only if changed.
1344
1345                         # Make sure the revision is either completely inserted or not inserted at all
1346                         if( !$wgDBtransactions ) {
1347                                 $userAbort = ignore_user_abort( true );
1348                         }
1349
1350                         $lastRevision = 0;
1351                         $revisionId = 0;
1352
1353                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1354
1355                         if ( $changed ) {
1356                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1357                                   - (int)$this->isCountable( $oldtext );
1358                                 $this->mTotalAdjustment = 0;
1359
1360                                 $lastRevision = $dbw->selectField(
1361                                         'page', 'page_latest', array( 'page_id' => $this->getId() ) );
1362
1363                                 if ( !$lastRevision ) {
1364                                         # Article gone missing
1365                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1366                                         wfProfileOut( __METHOD__ );
1367                                         return false;
1368                                 }
1369
1370                                 $revision = new Revision( array(
1371                                         'page'       => $this->getId(),
1372                                         'comment'    => $summary,
1373                                         'minor_edit' => $isminor,
1374                                         'text'       => $text
1375                                         ) );
1376
1377                                 $dbw->begin();
1378                                 $revisionId = $revision->insertOn( $dbw );
1379
1380                                 # Update page
1381                                 $ok = $this->updateRevisionOn( $dbw, $revision, $lastRevision );
1382
1383                                 if( !$ok ) {
1384                                         /* Belated edit conflict! Run away!! */
1385                                         $good = false;
1386                                         $dbw->rollback();
1387                                 } else {
1388                                         # Update recentchanges
1389                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1390                                                 $rcid = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $wgUser, $summary,
1391                                                         $lastRevision, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1392                                                         $revisionId );
1393
1394                                                 # Mark as patrolled if the user can do so
1395                                                 if( $GLOBALS['wgUseRCPatrol'] && $wgUser->isAllowed( 'autopatrol' ) ) {
1396                                                         RecentChange::markPatrolled( $rcid );
1397                                                         PatrolLog::record( $rcid, true );
1398                                                 }
1399                                         }
1400                                         $wgUser->incEditCount();
1401                                         $dbw->commit();
1402                                 }
1403                         } else {
1404                                 $revision = null;
1405                                 // Keep the same revision ID, but do some updates on it
1406                                 $revisionId = $this->getRevIdFetched();
1407                                 // Update page_touched, this is usually implicit in the page update
1408                                 // Other cache updates are done in onArticleEdit()
1409                                 $this->mTitle->invalidateCache();
1410                         }
1411
1412                         if( !$wgDBtransactions ) {
1413                                 ignore_user_abort( $userAbort );
1414                         }
1415
1416                         if ( $good ) {
1417                                 # Invalidate cache of this article and all pages using this article
1418                                 # as a template. Partly deferred.
1419                                 Article::onArticleEdit( $this->mTitle );
1420
1421                                 # Update links tables, site stats, etc.
1422                                 $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1423                         }
1424                 } else {
1425                         # Create new article
1426
1427                         # Set statistics members
1428                         # We work out if it's countable after PST to avoid counter drift
1429                         # when articles are created with {{subst:}}
1430                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1431                         $this->mTotalAdjustment = 1;
1432
1433                         $dbw->begin();
1434
1435                         # Add the page record; stake our claim on this title!
1436                         # This will fail with a database query exception if the article already exists
1437                         $newid = $this->insertOn( $dbw );
1438
1439                         # Save the revision text...
1440                         $revision = new Revision( array(
1441                                 'page'       => $newid,
1442                                 'comment'    => $summary,
1443                                 'minor_edit' => $isminor,
1444                                 'text'       => $text
1445                                 ) );
1446                         $revisionId = $revision->insertOn( $dbw );
1447
1448                         $this->mTitle->resetArticleID( $newid );
1449
1450                         # Update the page record with revision data
1451                         $this->updateRevisionOn( $dbw, $revision, 0 );
1452
1453                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1454                                 $rcid = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary, $bot,
1455                                   '', strlen( $text ), $revisionId );
1456                                 # Mark as patrolled if the user can
1457                                 if( ($GLOBALS['wgUseRCPatrol'] || $GLOBALS['wgUseNPPatrol']) && $wgUser->isAllowed( 'autopatrol' ) ) {
1458                                         RecentChange::markPatrolled( $rcid );
1459                                         PatrolLog::record( $rcid, true );
1460                                 }
1461                         }
1462                         $wgUser->incEditCount();
1463                         $dbw->commit();
1464
1465                         # Update links, etc.
1466                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1467
1468                         # Clear caches
1469                         Article::onArticleCreate( $this->mTitle );
1470
1471                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$wgUser, $text, $summary,
1472                          $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1473                 }
1474
1475                 if ( $good && !( $flags & EDIT_DEFER_UPDATES ) ) {
1476                         wfDoUpdates();
1477                 }
1478
1479                 if ( $good ) {
1480                         wfRunHooks( 'ArticleSaveComplete', array( &$this, &$wgUser, $text, $summary,
1481                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1482                 }
1483
1484                 wfProfileOut( __METHOD__ );
1485                 return $good;
1486         }
1487
1488         /**
1489          * @deprecated wrapper for doRedirect
1490          */
1491         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1492                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1493         }
1494
1495         /**
1496          * Output a redirect back to the article.
1497          * This is typically used after an edit.
1498          *
1499          * @param boolean $noRedir Add redirect=no
1500          * @param string $sectionAnchor section to redirect to, including "#"
1501          */
1502         function doRedirect( $noRedir = false, $sectionAnchor = '', $extraq = '' ) {
1503                 global $wgOut;
1504                 if ( $noRedir ) {
1505                         $query = 'redirect=no';
1506                         if( $extraq )
1507                                 $query .= "&$query";
1508                 } else {
1509                         $query = $extraq;
1510                 }
1511                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1512         }
1513
1514         /**
1515          * Mark this particular edit/page as patrolled
1516          */
1517         function markpatrolled() {
1518                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
1519                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1520
1521                 # Check patrol config options
1522
1523                 if ( !($wgUseNPPatrol || $wgUseRCPatrol)) {
1524                         $wgOut->errorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1525                         return;
1526                 }
1527
1528                 # If we haven't been given an rc_id value, we can't do anything
1529                 $rcid = (int) $wgRequest->getVal('rcid');
1530                 $rc = $rcid ? RecentChange::newFromId($rcid) : null;
1531                 if ( is_null ( $rc ) )
1532                 {
1533                         $wgOut->errorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1534                         return;
1535                 }
1536
1537                 if ( !$wgUseRCPatrol && $rc->mAttribs['rc_type'] != RC_NEW) {
1538                         // Only new pages can be patrolled if the general patrolling is off....???
1539                         // @fixme -- is this necessary? Shouldn't we only bother controlling the
1540                         // front end here?
1541                         $wgOut->errorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1542                         return;
1543                 }
1544
1545                 # Check permissions
1546                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'patrol', $wgUser );
1547
1548                 if (count($permission_errors)>0)
1549                 {
1550                         $wgOut->showPermissionsErrorPage( $permission_errors );
1551                         return;
1552                 }
1553
1554                 # Handle the 'MarkPatrolled' hook
1555                 if( !wfRunHooks( 'MarkPatrolled', array( $rcid, &$wgUser, false ) ) ) {
1556                         return;
1557                 }
1558
1559                 #It would be nice to see where the user had actually come from, but for now just guess
1560                 $returnto = $rc->mAttribs['rc_type'] == RC_NEW ? 'Newpages' : 'Recentchanges';
1561                 $return = Title::makeTitle( NS_SPECIAL, $returnto );
1562
1563                 # If it's left up to us, check that the user is allowed to patrol this edit
1564                 # If the user has the "autopatrol" right, then we'll assume there are no
1565                 # other conditions stopping them doing so
1566                 if( !$wgUser->isAllowed( 'autopatrol' ) ) {
1567                         $rc = RecentChange::newFromId( $rcid );
1568                         # Graceful error handling, as we've done before here...
1569                         # (If the recent change doesn't exist, then it doesn't matter whether
1570                         # the user is allowed to patrol it or not; nothing is going to happen
1571                         if( is_object( $rc ) && $wgUser->getName() == $rc->getAttribute( 'rc_user_text' ) ) {
1572                                 # The user made this edit, and can't patrol it
1573                                 # Tell them so, and then back off
1574                                 $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1575                                 $wgOut->addWikiText( wfMsgNoTrans( 'markedaspatrollederror-noautopatrol' ) );
1576                                 $wgOut->returnToMain( false, $return );
1577                                 return;
1578                         }
1579                 }
1580
1581                 # Mark the edit as patrolled
1582                 RecentChange::markPatrolled( $rcid );
1583                 PatrolLog::record( $rcid );
1584                 wfRunHooks( 'MarkPatrolledComplete', array( &$rcid, &$wgUser, false ) );
1585
1586                 # Inform the user
1587                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1588                 $wgOut->addWikiText( wfMsgNoTrans( 'markedaspatrolledtext' ) );
1589                 $wgOut->returnToMain( false, $return );
1590         }
1591
1592         /**
1593          * User-interface handler for the "watch" action
1594          */
1595
1596         function watch() {
1597
1598                 global $wgUser, $wgOut;
1599
1600                 if ( $wgUser->isAnon() ) {
1601                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1602                         return;
1603                 }
1604                 if ( wfReadOnly() ) {
1605                         $wgOut->readOnlyPage();
1606                         return;
1607                 }
1608
1609                 if( $this->doWatch() ) {
1610                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1611                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1612
1613                         $link = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
1614                         $text = wfMsg( 'addedwatchtext', $link );
1615                         $wgOut->addWikiText( $text );
1616                 }
1617
1618                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1619         }
1620
1621         /**
1622          * Add this page to $wgUser's watchlist
1623          * @return bool true on successful watch operation
1624          */
1625         function doWatch() {
1626                 global $wgUser;
1627                 if( $wgUser->isAnon() ) {
1628                         return false;
1629                 }
1630
1631                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1632                         $wgUser->addWatch( $this->mTitle );
1633
1634                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1635                 }
1636
1637                 return false;
1638         }
1639
1640         /**
1641          * User interface handler for the "unwatch" action.
1642          */
1643         function unwatch() {
1644
1645                 global $wgUser, $wgOut;
1646
1647                 if ( $wgUser->isAnon() ) {
1648                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1649                         return;
1650                 }
1651                 if ( wfReadOnly() ) {
1652                         $wgOut->readOnlyPage();
1653                         return;
1654                 }
1655
1656                 if( $this->doUnwatch() ) {
1657                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1658                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1659
1660                         $link = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
1661                         $text = wfMsg( 'removedwatchtext', $link );
1662                         $wgOut->addWikiText( $text );
1663                 }
1664
1665                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1666         }
1667
1668         /**
1669          * Stop watching a page
1670          * @return bool true on successful unwatch
1671          */
1672         function doUnwatch() {
1673                 global $wgUser;
1674                 if( $wgUser->isAnon() ) {
1675                         return false;
1676                 }
1677
1678                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1679                         $wgUser->removeWatch( $this->mTitle );
1680
1681                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1682                 }
1683
1684                 return false;
1685         }
1686
1687         /**
1688          * action=protect handler
1689          */
1690         function protect() {
1691                 $form = new ProtectionForm( $this );
1692                 $form->execute();
1693         }
1694
1695         /**
1696          * action=unprotect handler (alias)
1697          */
1698         function unprotect() {
1699                 $this->protect();
1700         }
1701
1702         /**
1703          * Update the article's restriction field, and leave a log entry.
1704          *
1705          * @param array $limit set of restriction keys
1706          * @param string $reason
1707          * @return bool true on success
1708          */
1709         function updateRestrictions( $limit = array(), $reason = '', $cascade = 0, $expiry = null ) {
1710                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1711
1712                 $id = $this->mTitle->getArticleID();
1713                 if( array() != $this->mTitle->getUserPermissionsErrors( 'protect', $wgUser ) || wfReadOnly() || $id == 0 ) {
1714                         return false;
1715                 }
1716
1717                 if (!$cascade) {
1718                         $cascade = false;
1719                 }
1720
1721                 // Take this opportunity to purge out expired restrictions
1722                 Title::purgeExpiredRestrictions();
1723
1724                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1725                 # we expect a single selection, but the schema allows otherwise.
1726                 $current = array();
1727                 foreach( $wgRestrictionTypes as $action )
1728                         $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1729
1730                 $current = Article::flattenRestrictions( $current );
1731                 $updated = Article::flattenRestrictions( $limit );
1732
1733                 $changed = ( $current != $updated );
1734                 $changed = $changed || ($this->mTitle->areRestrictionsCascading() != $cascade);
1735                 $changed = $changed || ($this->mTitle->mRestrictionsExpiry != $expiry);
1736                 $protect = ( $updated != '' );
1737
1738                 # If nothing's changed, do nothing
1739                 if( $changed ) {
1740                         global $wgGroupPermissions;
1741                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1742
1743                                 $dbw = wfGetDB( DB_MASTER );
1744
1745                                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1746
1747                                 $expiry_description = '';
1748                                 if ( $encodedExpiry != 'infinity' ) {
1749                                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ) ).')';
1750                                 }
1751
1752                                 # Prepare a null revision to be added to the history
1753                                 $modified = $current != '' && $protect;
1754                                 if ( $protect ) {
1755                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1756                                 } else {
1757                                         $comment_type = 'unprotectedarticle';
1758                                 }
1759                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1760
1761                                 foreach( $limit as $action => $restrictions ) {
1762                                         # Check if the group level required to edit also can protect pages
1763                                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1764                                         $cascade = ( $cascade && isset($wgGroupPermissions[$restrictions]['protect']) && $wgGroupPermissions[$restrictions]['protect'] );
1765                                 }
1766
1767                                 $cascade_description = '';
1768                                 if ($cascade) {
1769                                         $cascade_description = ' ['.wfMsg('protect-summary-cascade').']';
1770                                 }
1771
1772                                 if( $reason )
1773                                         $comment .= ": $reason";
1774                                 if( $protect )
1775                                         $comment .= " [$updated]";
1776                                 if ( $expiry_description && $protect )
1777                                         $comment .= "$expiry_description";
1778                                 if ( $cascade )
1779                                         $comment .= "$cascade_description";
1780
1781                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $comment, true );
1782                                 $nullRevId = $nullRevision->insertOn( $dbw );
1783
1784                                 # Update restrictions table
1785                                 foreach( $limit as $action => $restrictions ) {
1786                                         if ($restrictions != '' ) {
1787                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
1788                                                         array( 'pr_page' => $id, 'pr_type' => $action
1789                                                                 , 'pr_level' => $restrictions, 'pr_cascade' => $cascade ? 1 : 0
1790                                                                 , 'pr_expiry' => $encodedExpiry ), __METHOD__  );
1791                                         } else {
1792                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1793                                                         'pr_type' => $action ), __METHOD__ );
1794                                         }
1795                                 }
1796
1797                                 # Update page record
1798                                 $dbw->update( 'page',
1799                                         array( /* SET */
1800                                                 'page_touched' => $dbw->timestamp(),
1801                                                 'page_restrictions' => '',
1802                                                 'page_latest' => $nullRevId
1803                                         ), array( /* WHERE */
1804                                                 'page_id' => $id
1805                                         ), 'Article::protect'
1806                                 );
1807                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1808
1809                                 # Update the protection log
1810                                 $log = new LogPage( 'protect' );
1811
1812                                 if( $protect ) {
1813                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason . " [$updated]$cascade_description$expiry_description" ) );
1814                                 } else {
1815                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1816                                 }
1817
1818                         } # End hook
1819                 } # End "changed" check
1820
1821                 return true;
1822         }
1823
1824         /**
1825          * Take an array of page restrictions and flatten it to a string
1826          * suitable for insertion into the page_restrictions field.
1827          * @param array $limit
1828          * @return string
1829          * @private
1830          */
1831         function flattenRestrictions( $limit ) {
1832                 if( !is_array( $limit ) ) {
1833                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
1834                 }
1835                 $bits = array();
1836                 ksort( $limit );
1837                 foreach( $limit as $action => $restrictions ) {
1838                         if( $restrictions != '' ) {
1839                                 $bits[] = "$action=$restrictions";
1840                         }
1841                 }
1842                 return implode( ':', $bits );
1843         }
1844
1845         /**
1846          * Auto-generates a deletion reason
1847          * @param bool &$hasHistory Whether the page has a history
1848          */
1849         public function generateReason(&$hasHistory)
1850         {
1851                 global $wgContLang;
1852                 $dbw = wfGetDB(DB_MASTER);
1853                 // Get the last revision
1854                 $rev = Revision::newFromTitle($this->mTitle);
1855                 if(is_null($rev))
1856                         return false;
1857                 // Get the article's contents
1858                 $contents = $rev->getText();
1859                 $blank = false;
1860                 // If the page is blank, use the text from the previous revision,
1861                 // which can only be blank if there's a move/import/protect dummy revision involved
1862                 if($contents == '')
1863                 {
1864                         $prev = $rev->getPrevious();
1865                         if($prev)
1866                         {
1867                                 $contents = $prev->getText();
1868                                 $blank = true;
1869                         }
1870                 }
1871
1872                 // Find out if there was only one contributor
1873                 // Only scan the last 20 revisions
1874                 $limit = 20;
1875                 $res = $dbw->select('revision', 'rev_user_text', array('rev_page' => $this->getID()), __METHOD__,
1876                                 array('LIMIT' => $limit));
1877                 if($res === false)
1878                         // This page has no revisions, which is very weird
1879                         return false;
1880                 if($res->numRows() > 1)
1881                                 $hasHistory = true;
1882                 else
1883                                 $hasHistory = false;
1884                 $row = $dbw->fetchObject($res);
1885                 $onlyAuthor = $row->rev_user_text;
1886                 // Try to find a second contributor
1887                 while( $row = $dbw->fetchObject($res) ) {
1888                         if($row->rev_user_text != $onlyAuthor) {
1889                                 $onlyAuthor = false;
1890                                 break;
1891                         }
1892                 }
1893                 $dbw->freeResult($res);
1894
1895                 // Generate the summary with a '$1' placeholder
1896                 if($blank) {
1897                         // The current revision is blank and the one before is also
1898                         // blank. It's just not our lucky day
1899                         $reason = wfMsgForContent('exbeforeblank', '$1');
1900                 } else {
1901                         if($onlyAuthor)
1902                                 $reason = wfMsgForContent('excontentauthor', '$1', $onlyAuthor);
1903                         else
1904                                 $reason = wfMsgForContent('excontent', '$1');
1905                 }
1906
1907                 // Replace newlines with spaces to prevent uglyness
1908                 $contents = preg_replace("/[\n\r]/", ' ', $contents);
1909                 // Calculate the maximum amount of chars to get
1910                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
1911                 $maxLength = 255 - (strlen($reason) - 2) - 3;
1912                 $contents = $wgContLang->truncate($contents, $maxLength, '...');
1913                 // Remove possible unfinished links
1914                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
1915                 // Now replace the '$1' placeholder
1916                 $reason = str_replace( '$1', $contents, $reason );
1917                 return $reason;
1918         }
1919
1920
1921         /*
1922          * UI entry point for page deletion
1923          */
1924         function delete() {
1925                 global $wgUser, $wgOut, $wgRequest;
1926
1927                 $confirm = $wgRequest->wasPosted() &&
1928                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1929
1930                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
1931                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
1932
1933                 $reason = $this->DeleteReasonList;
1934
1935                 if ( $reason != 'other' && $this->DeleteReason != '') {
1936                         // Entry from drop down menu + additional comment
1937                         $reason .= ': ' . $this->DeleteReason;
1938                 } elseif ( $reason == 'other' ) {
1939                         $reason = $this->DeleteReason;
1940                 }
1941
1942                 # This code desperately needs to be totally rewritten
1943
1944                 # Check permissions
1945                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1946
1947                 if (count($permission_errors)>0) {
1948                         $wgOut->showPermissionsErrorPage( $permission_errors );
1949                         return;
1950                 }
1951
1952                 $wgOut->setPagetitle( wfMsg( 'confirmdelete' ) );
1953
1954                 # Better double-check that it hasn't been deleted yet!
1955                 $dbw = wfGetDB( DB_MASTER );
1956                 $conds = $this->mTitle->pageCond();
1957                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
1958                 if ( $latest === false ) {
1959                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
1960                         return;
1961                 }
1962
1963                 if( $confirm ) {
1964                         $this->doDelete( $reason );
1965                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
1966                                 $this->doWatch();
1967                         } elseif( $this->mTitle->userIsWatching() ) {
1968                                 $this->doUnwatch();
1969                         }
1970                         return;
1971                 }
1972
1973                 // Generate deletion reason
1974                 $hasHistory = false;
1975                 if ( !$reason ) $reason = $this->generateReason($hasHistory);
1976
1977                 // If the page has a history, insert a warning
1978                 if( $hasHistory && !$confirm ) {
1979                         $skin=$wgUser->getSkin();
1980                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
1981                 }
1982
1983                 return $this->confirmDelete( '', $reason );
1984         }
1985
1986         /**
1987          * Get the last N authors
1988          * @param int $num Number of revisions to get
1989          * @param string $revLatest The latest rev_id, selected from the master (optional)
1990          * @return array Array of authors, duplicates not removed
1991          */
1992         function getLastNAuthors( $num, $revLatest = 0 ) {
1993                 wfProfileIn( __METHOD__ );
1994
1995                 // First try the slave
1996                 // If that doesn't have the latest revision, try the master
1997                 $continue = 2;
1998                 $db = wfGetDB( DB_SLAVE );
1999                 do {
2000                         $res = $db->select( array( 'page', 'revision' ),
2001                                 array( 'rev_id', 'rev_user_text' ),
2002                                 array(
2003                                         'page_namespace' => $this->mTitle->getNamespace(),
2004                                         'page_title' => $this->mTitle->getDBkey(),
2005                                         'rev_page = page_id'
2006                                 ), __METHOD__, $this->getSelectOptions( array(
2007                                         'ORDER BY' => 'rev_timestamp DESC',
2008                                         'LIMIT' => $num
2009                                 ) )
2010                         );
2011                         if ( !$res ) {
2012                                 wfProfileOut( __METHOD__ );
2013                                 return array();
2014                         }
2015                         $row = $db->fetchObject( $res );
2016                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2017                                 $db = wfGetDB( DB_MASTER );
2018                                 $continue--;
2019                         } else {
2020                                 $continue = 0;
2021                         }
2022                 } while ( $continue );
2023
2024                 $authors = array( $row->rev_user_text );
2025                 while ( $row = $db->fetchObject( $res ) ) {
2026                         $authors[] = $row->rev_user_text;
2027                 }
2028                 wfProfileOut( __METHOD__ );
2029                 return $authors;
2030         }
2031
2032         /**
2033          * Output deletion confirmation dialog
2034          */
2035         function confirmDelete( $par, $reason ) {
2036                 global $wgOut, $wgUser;
2037
2038                 wfDebug( "Article::confirmDelete\n" );
2039
2040                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
2041                 $wgOut->setSubtitle( wfMsg( 'deletesub', $sub ) );
2042                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2043                 $wgOut->addWikiText( wfMsg( 'confirmdeletetext' ) );
2044
2045                 $formaction = $this->mTitle->escapeLocalURL( 'action=delete' . $par );
2046
2047                 $confirm = htmlspecialchars( wfMsg( 'deletepage' ) );
2048                 $delcom = Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' );
2049                 $token = htmlspecialchars( $wgUser->editToken() );
2050                 $watch = Xml::checkLabel( wfMsg( 'watchthis' ), 'wpWatch', 'wpWatch', $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching(), array( 'tabindex' => '2' ) );
2051
2052                 $mDeletereasonother = Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' );
2053                 $mDeletereasonotherlist = wfMsgHtml( 'deletereasonotherlist' );
2054                 $scDeleteReasonList = wfMsgForContent( 'deletereason-dropdown' );
2055
2056                 $deleteReasonList = '';
2057                 if ( $scDeleteReasonList != '' && $scDeleteReasonList != '-' ) {
2058                         $deleteReasonList = "<option value=\"other\">$mDeletereasonotherlist</option>";
2059                         $optgroup = "";
2060                         foreach ( explode( "\n", $scDeleteReasonList ) as $option) {
2061                                 $value = trim( htmlspecialchars($option) );
2062                                 if ( $value == '' ) {
2063                                         continue;
2064                                 } elseif ( substr( $value, 0, 1) == '*' && substr( $value, 1, 1) != '*' ) {
2065                                         // A new group is starting ...
2066                                         $value = trim( substr( $value, 1 ) );
2067                                         $deleteReasonList .= "$optgroup<optgroup label=\"$value\">";
2068                                         $optgroup = "</optgroup>";
2069                                 } elseif ( substr( $value, 0, 2) == '**' ) {
2070                                         // groupmember
2071                                         $selected = "";
2072                                         $value = trim( substr( $value, 2 ) );
2073                                         if ( $this->DeleteReasonList === $value)
2074                                                 $selected = ' selected="selected"';
2075                                         $deleteReasonList .= "<option value=\"$value\"$selected>$value</option>";
2076                                 } else {
2077                                         // groupless delete reason
2078                                         $selected = "";
2079                                         if ( $this->DeleteReasonList === $value)
2080                                                 $selected = ' selected="selected"';
2081                                         $deleteReasonList .= "$optgroup<option value=\"$value\"$selected>$value</option>";
2082                                         $optgroup = "";
2083                                 }
2084                         }
2085                         $deleteReasonList .= $optgroup;
2086                 }
2087                 $wgOut->addHTML( "
2088 <form id='deleteconfirm' method='post' action=\"{$formaction}\">
2089         <table border='0'>
2090                 <tr id=\"wpDeleteReasonListRow\" name=\"wpDeleteReasonListRow\">
2091                         <td align='right'>
2092                                 $delcom:
2093                         </td>
2094                         <td align='left'>
2095                                 <select tabindex='1' id='wpDeleteReasonList' name=\"wpDeleteReasonList\">
2096                                         $deleteReasonList
2097                                 </select>
2098                         </td>
2099                 </tr>
2100                 <tr id=\"wpDeleteReasonRow\" name=\"wpDeleteReasonRow\">
2101                         <td>
2102                                 $mDeletereasonother
2103                         </td>
2104                         <td align='left'>
2105                                 <input type='text' maxlength='255' size='60' name='wpReason' id='wpReason' value=\"" . htmlspecialchars( $reason ) . "\" tabindex=\"2\" />
2106                         </td>
2107                 </tr>
2108                 <tr>
2109                         <td>&nbsp;</td>
2110                         <td>$watch</td>
2111                 </tr>
2112                 <tr>
2113                         <td>&nbsp;</td>
2114                         <td>
2115                                 <input type='submit' name='wpConfirmB' id='wpConfirmB' value=\"{$confirm}\" tabindex=\"3\" />
2116                         </td>
2117                 </tr>
2118         </table>
2119         <input type='hidden' name='wpEditToken' value=\"{$token}\" />
2120 </form>\n" );
2121
2122                 $wgOut->returnToMain( false, $this->mTitle );
2123
2124                 $this->showLogExtract( $wgOut );
2125         }
2126
2127
2128         /**
2129          * Show relevant lines from the deletion log
2130          */
2131         function showLogExtract( $out ) {
2132                 $out->addHtml( '<h2>' . htmlspecialchars( LogPage::logName( 'delete' ) ) . '</h2>' );
2133                 $logViewer = new LogViewer(
2134                         new LogReader(
2135                                 new FauxRequest(
2136                                         array( 'page' => $this->mTitle->getPrefixedText(),
2137                                                'type' => 'delete' ) ) ) );
2138                 $logViewer->showList( $out );
2139         }
2140
2141
2142         /**
2143          * Perform a deletion and output success or failure messages
2144          */
2145         function doDelete( $reason ) {
2146                 global $wgOut, $wgUser;
2147                 wfDebug( __METHOD__."\n" );
2148
2149                 if (wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason))) {
2150                         if ( $this->doDeleteArticle( $reason ) ) {
2151                                 $deleted = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2152
2153                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2154                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2155
2156                                 $loglink = '[[Special:Log/delete|' . wfMsg( 'deletionlog' ) . ']]';
2157                                 $text = wfMsg( 'deletedtext', $deleted, $loglink );
2158
2159                                 $wgOut->addWikiText( $text );
2160                                 $wgOut->returnToMain( false );
2161                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason));
2162                         } else {
2163                                 $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
2164                         }
2165                 }
2166         }
2167
2168         /**
2169          * Back-end article deletion
2170          * Deletes the article with database consistency, writes logs, purges caches
2171          * Returns success
2172          */
2173         function doDeleteArticle( $reason ) {
2174                 global $wgUseSquid, $wgDeferredUpdateList;
2175                 global $wgUseTrackbacks;
2176
2177                 wfDebug( __METHOD__."\n" );
2178
2179                 $dbw = wfGetDB( DB_MASTER );
2180                 $ns = $this->mTitle->getNamespace();
2181                 $t = $this->mTitle->getDBkey();
2182                 $id = $this->mTitle->getArticleID();
2183
2184                 if ( $t == '' || $id == 0 ) {
2185                         return false;
2186                 }
2187
2188                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
2189                 array_push( $wgDeferredUpdateList, $u );
2190
2191                 // For now, shunt the revision data into the archive table.
2192                 // Text is *not* removed from the text table; bulk storage
2193                 // is left intact to avoid breaking block-compression or
2194                 // immutable storage schemes.
2195                 //
2196                 // For backwards compatibility, note that some older archive
2197                 // table entries will have ar_text and ar_flags fields still.
2198                 //
2199                 // In the future, we may keep revisions and mark them with
2200                 // the rev_deleted field, which is reserved for this purpose.
2201                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2202                         array(
2203                                 'ar_namespace'  => 'page_namespace',
2204                                 'ar_title'      => 'page_title',
2205                                 'ar_comment'    => 'rev_comment',
2206                                 'ar_user'       => 'rev_user',
2207                                 'ar_user_text'  => 'rev_user_text',
2208                                 'ar_timestamp'  => 'rev_timestamp',
2209                                 'ar_minor_edit' => 'rev_minor_edit',
2210                                 'ar_rev_id'     => 'rev_id',
2211                                 'ar_text_id'    => 'rev_text_id',
2212                                 'ar_text'       => '\'\'', // Be explicit to appease
2213                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2214                                 'ar_len'                => 'rev_len',
2215                                 'ar_page_id'    => 'page_id',
2216                         ), array(
2217                                 'page_id' => $id,
2218                                 'page_id = rev_page'
2219                         ), __METHOD__
2220                 );
2221
2222                 # Delete restrictions for it
2223                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2224
2225                 # Now that it's safely backed up, delete it
2226                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2227
2228                 # If using cascading deletes, we can skip some explicit deletes
2229                 if ( !$dbw->cascadingDeletes() ) {
2230
2231                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2232
2233                         if ($wgUseTrackbacks)
2234                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2235
2236                         # Delete outgoing links
2237                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2238                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2239                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2240                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2241                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2242                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2243                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2244                 }
2245
2246                 # If using cleanup triggers, we can skip some manual deletes
2247                 if ( !$dbw->cleanupTriggers() ) {
2248
2249                         # Clean up recentchanges entries...
2250                         $dbw->delete( 'recentchanges', array( 'rc_namespace' => $ns, 'rc_title' => $t ), __METHOD__ );
2251                 }
2252
2253                 # Clear caches
2254                 Article::onArticleDelete( $this->mTitle );
2255
2256                 # Log the deletion
2257                 $log = new LogPage( 'delete' );
2258                 $log->addEntry( 'delete', $this->mTitle, $reason );
2259
2260                 # Clear the cached article id so the interface doesn't act like we exist
2261                 $this->mTitle->resetArticleID( 0 );
2262                 $this->mTitle->mArticleID = 0;
2263                 return true;
2264         }
2265
2266         /**
2267          * Roll back the most recent consecutive set of edits to a page
2268          * from the same user; fails if there are no eligible edits to
2269          * roll back to, e.g. user is the sole contributor
2270          *
2271          * @param string $fromP - Name of the user whose edits to rollback.
2272          * @param string $summary - Custom summary. Set to default summary if empty.
2273          * @param string $token - Rollback token.
2274          * @param bool $bot - If true, mark all reverted edits as bot.
2275          *
2276          * @param array $resultDetails contains result-specific dict of additional values
2277          *    ALREADY_ROLLED : 'current' (rev)
2278          *    SUCCESS        : 'summary' (str), 'current' (rev), 'target' (rev)
2279          *
2280          * @return self::SUCCESS on succes, self::* on failure
2281          */
2282         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2283                 global $wgUser, $wgUseRCPatrol, $wgRequest;
2284                 $resultDetails = null;
2285
2286                 # Just in case it's being called from elsewhere
2287
2288                 if( $wgUser->isAllowed( 'rollback' ) && $this->mTitle->userCan( 'edit' ) ) {
2289                         if( $wgUser->isBlocked() ) {
2290                                 return self::BLOCKED;
2291                         }
2292                 } else {
2293                         return self::PERM_DENIED;
2294                 }
2295
2296                 if ( wfReadOnly() ) {
2297                         return self::READONLY;
2298                 }
2299
2300                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2301                         return self::BAD_TOKEN;
2302
2303                 if ( $wgUser->pingLimiter('rollback') || $wgUser->pingLimiter() ) {
2304                         return self::RATE_LIMITED;
2305                 }
2306
2307                 $dbw = wfGetDB( DB_MASTER );
2308
2309                 # Get the last editor
2310                 $current = Revision::newFromTitle( $this->mTitle );
2311                 if( is_null( $current ) ) {
2312                         # Something wrong... no page?
2313                         return self::BAD_TITLE;
2314                 }
2315
2316                 $from = str_replace( '_', ' ', $fromP );
2317                 if( $from != $current->getUserText() ) {
2318                         $resultDetails = array( 'current' => $current );
2319                         return self::ALREADY_ROLLED;
2320                 }
2321
2322                 # Get the last edit not by this guy
2323                 $user = intval( $current->getUser() );
2324                 $user_text = $dbw->addQuotes( $current->getUserText() );
2325                 $s = $dbw->selectRow( 'revision',
2326                         array( 'rev_id', 'rev_timestamp' ),
2327                         array(
2328                                 'rev_page' => $current->getPage(),
2329                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
2330                         ), __METHOD__,
2331                         array(
2332                                 'USE INDEX' => 'page_timestamp',
2333                                 'ORDER BY'  => 'rev_timestamp DESC' )
2334                         );
2335                 if( $s === false ) {
2336                         # Something wrong
2337                         return self::ONLY_AUTHOR;
2338                 }
2339
2340                 $set = array();
2341                 if ( $bot && $wgUser->isAllowed('markbotedits') ) {
2342                         # Mark all reverted edits as bot
2343                         $set['rc_bot'] = 1;
2344                 }
2345                 if ( $wgUseRCPatrol ) {
2346                         # Mark all reverted edits as patrolled
2347                         $set['rc_patrolled'] = 1;
2348                 }
2349
2350                 if ( $set ) {
2351                         $dbw->update( 'recentchanges', $set,
2352                                         array( /* WHERE */
2353                                                 'rc_cur_id' => $current->getPage(),
2354                                                 'rc_user_text' => $current->getUserText(),
2355                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2356                                         ), __METHOD__
2357                                 );
2358                 }
2359
2360                 # Get the edit summary
2361                 $target = Revision::newFromId( $s->rev_id );
2362                 if( empty( $summary ) )
2363                         $summary = wfMsgForContent( 'revertpage', $target->getUserText(), $from );
2364
2365                 # Save
2366                 $flags = EDIT_UPDATE;
2367
2368                 if ($wgUser->isAllowed('minoredit'))
2369                         $flags |= EDIT_MINOR;
2370
2371                 if( $bot && $wgRequest->getBool( 'bot' , true ) )
2372                         $flags |= EDIT_FORCE_BOT;
2373                 $this->doEdit( $target->getText(), $summary, $flags );
2374
2375                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target ) );
2376
2377                 $resultDetails = array(
2378                         'summary' => $summary,
2379                         'current' => $current,
2380                         'target' => $target,
2381                 );
2382                 return self::SUCCESS;
2383         }
2384
2385         /**
2386          * User interface for rollback operations
2387          */
2388         function rollback() {
2389                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2390
2391                 $details = null;
2392
2393                 # Skip the permissions-checking in doRollback() itself, by checking permissions here.
2394
2395                 $perm_errors = array_merge( $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser ),
2396                                                 $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser ) );
2397
2398                 if (count($perm_errors)) {
2399                         $wgOut->showPermissionsErrorPage( $perm_errors );
2400                         return;
2401                 }
2402
2403                 $result = $this->doRollback(
2404                         $wgRequest->getVal( 'from' ),
2405                         $wgRequest->getText( 'summary' ),
2406                         $wgRequest->getVal( 'token' ),
2407                         $wgRequest->getBool( 'bot' ),
2408                         $details
2409                 );
2410
2411                 switch( $result ) {
2412                         case self::BLOCKED:
2413                                 $wgOut->blockedPage();
2414                                 break;
2415                         case self::PERM_DENIED:
2416                                 $wgOut->permissionRequired( 'rollback' );
2417                                 break;
2418                         case self::READONLY:
2419                                 $wgOut->readOnlyPage( $this->getContent() );
2420                                 break;
2421                         case self::BAD_TOKEN:
2422                                 $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2423                                 $wgOut->addWikiText( wfMsg( 'sessionfailure' ) );
2424                                 break;
2425                         case self::BAD_TITLE:
2426                                 $wgOut->addHtml( wfMsg( 'notanarticle' ) );
2427                                 break;
2428                         case self::ALREADY_ROLLED:
2429                                 $current = $details['current'];
2430                                 $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2431                                 $wgOut->addWikiText(
2432                                         wfMsg( 'alreadyrolled',
2433                                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2434                                                 htmlspecialchars( $wgRequest->getVal( 'from' ) ),
2435                                                 htmlspecialchars( $current->getUserText() )
2436                                         )
2437                                 );
2438                                 if( $current->getComment() != '' ) {
2439                                         $wgOut->addHtml( wfMsg( 'editcomment',
2440                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ) );
2441                                 }
2442                                 break;
2443                         case self::ONLY_AUTHOR:
2444                                 $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2445                                 $wgOut->addHtml( wfMsg( 'cantrollback' ) );
2446                                 break;
2447                         case self::RATE_LIMITED:
2448                                 $wgOut->rateLimited();
2449                                 break;
2450                         case self::SUCCESS:
2451                                 $current = $details['current'];
2452                                 $target = $details['target'];
2453                                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2454                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2455                                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2456                                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2457                                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2458                                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2459                                 $wgOut->addHtml( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2460                                 $wgOut->returnToMain( false, $this->mTitle );
2461                                 break;
2462                         default:
2463                                 throw new MWException( __METHOD__ . ": Unknown return value `{$result}`" );
2464                 }
2465
2466         }
2467
2468
2469         /**
2470          * Do standard deferred updates after page view
2471          * @private
2472          */
2473         function viewUpdates() {
2474                 global $wgDeferredUpdateList;
2475
2476                 if ( 0 != $this->getID() ) {
2477                         global $wgDisableCounters;
2478                         if( !$wgDisableCounters ) {
2479                                 Article::incViewCount( $this->getID() );
2480                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2481                                 array_push( $wgDeferredUpdateList, $u );
2482                         }
2483                 }
2484
2485                 # Update newtalk / watchlist notification status
2486                 global $wgUser;
2487                 $wgUser->clearNotification( $this->mTitle );
2488         }
2489
2490         /**
2491          * Prepare text which is about to be saved.
2492          * Returns a stdclass with source, pst and output members
2493          */
2494         function prepareTextForEdit( $text, $revid=null ) {
2495                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
2496                         // Already prepared
2497                         return $this->mPreparedEdit;
2498                 }
2499                 global $wgParser;
2500                 $edit = (object)array();
2501                 $edit->revid = $revid;
2502                 $edit->newText = $text;
2503                 $edit->pst = $this->preSaveTransform( $text );
2504                 $options = new ParserOptions;
2505                 $options->setTidy( true );
2506                 $options->enableLimitReport();
2507                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
2508                 $edit->oldText = $this->getContent();
2509                 $this->mPreparedEdit = $edit;
2510                 return $edit;
2511         }
2512
2513         /**
2514          * Do standard deferred updates after page edit.
2515          * Update links tables, site stats, search index and message cache.
2516          * Every 100th edit, prune the recent changes table.
2517          *
2518          * @private
2519          * @param $text New text of the article
2520          * @param $summary Edit summary
2521          * @param $minoredit Minor edit
2522          * @param $timestamp_of_pagechange Timestamp associated with the page change
2523          * @param $newid rev_id value of the new revision
2524          * @param $changed Whether or not the content actually changed
2525          */
2526         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2527                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser;
2528
2529                 wfProfileIn( __METHOD__ );
2530
2531                 # Parse the text
2532                 # Be careful not to double-PST: $text is usually already PST-ed once
2533                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2534                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2535                         $editInfo = $this->prepareTextForEdit( $text, $newid );
2536                 } else {
2537                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2538                         $editInfo = $this->mPreparedEdit;
2539                 }
2540
2541                 # Save it to the parser cache
2542                 $parserCache =& ParserCache::singleton();
2543                 $parserCache->save( $editInfo->output, $this, $wgUser );
2544
2545                 # Update the links tables
2546                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
2547                 $u->doUpdate();
2548
2549                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2550                         if ( 0 == mt_rand( 0, 99 ) ) {
2551                                 // Flush old entries from the `recentchanges` table; we do this on
2552                                 // random requests so as to avoid an increase in writes for no good reason
2553                                 global $wgRCMaxAge;
2554                                 $dbw = wfGetDB( DB_MASTER );
2555                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2556                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2557                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2558                                 $dbw->query( $sql );
2559                         }
2560                 }
2561
2562                 $id = $this->getID();
2563                 $title = $this->mTitle->getPrefixedDBkey();
2564                 $shortTitle = $this->mTitle->getDBkey();
2565
2566                 if ( 0 == $id ) {
2567                         wfProfileOut( __METHOD__ );
2568                         return;
2569                 }
2570
2571                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2572                 array_push( $wgDeferredUpdateList, $u );
2573                 $u = new SearchUpdate( $id, $title, $text );
2574                 array_push( $wgDeferredUpdateList, $u );
2575
2576                 # If this is another user's talk page, update newtalk
2577                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2578                 # load of user talk pages and piss people off, nor if it's a minor edit
2579                 # by a properly-flagged bot.
2580                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2581                         && !($minoredit && $wgUser->isAllowed('nominornewtalk') ) ) {
2582                         if (wfRunHooks('ArticleEditUpdateNewTalk', array(&$this)) ) {
2583                                 $other = User::newFromName( $shortTitle );
2584                                 if( is_null( $other ) && User::isIP( $shortTitle ) ) {
2585                                         // An anonymous user
2586                                         $other = new User();
2587                                         $other->setName( $shortTitle );
2588                                 }
2589                                 if( $other ) {
2590                                         $other->setNewtalk( true );
2591                                 }
2592                         }
2593                 }
2594
2595                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2596                         $wgMessageCache->replace( $shortTitle, $text );
2597                 }
2598
2599                 wfProfileOut( __METHOD__ );
2600         }
2601
2602         /**
2603          * Perform article updates on a special page creation.
2604          *
2605          * @param Revision $rev
2606          *
2607          * @todo This is a shitty interface function. Kill it and replace the
2608          * other shitty functions like editUpdates and such so it's not needed
2609          * anymore.
2610          */
2611         function createUpdates( $rev ) {
2612                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2613                 $this->mTotalAdjustment = 1;
2614                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2615                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2616         }
2617
2618         /**
2619          * Generate the navigation links when browsing through an article revisions
2620          * It shows the information as:
2621          *   Revision as of \<date\>; view current revision
2622          *   \<- Previous version | Next Version -\>
2623          *
2624          * @private
2625          * @param string $oldid         Revision ID of this article revision
2626          */
2627         function setOldSubtitle( $oldid=0 ) {
2628                 global $wgLang, $wgOut, $wgUser;
2629
2630                 if ( !wfRunHooks( 'DisplayOldSubtitle', array(&$this, &$oldid) ) ) {
2631                                 return;
2632                 }
2633
2634                 $revision = Revision::newFromId( $oldid );
2635
2636                 $current = ( $oldid == $this->mLatest );
2637                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2638                 $sk = $wgUser->getSkin();
2639                 $lnk = $current
2640                         ? wfMsg( 'currentrevisionlink' )
2641                         : $lnk = $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2642                 $curdiff = $current
2643                         ? wfMsg( 'diff' )
2644                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=cur&oldid='.$oldid );
2645                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2646                 $prevlink = $prev
2647                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2648                         : wfMsg( 'previousrevision' );
2649                 $prevdiff = $prev
2650                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=prev&oldid='.$oldid )
2651                         : wfMsg( 'diff' );
2652                 $nextlink = $current
2653                         ? wfMsg( 'nextrevision' )
2654                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2655                 $nextdiff = $current
2656                         ? wfMsg( 'diff' )
2657                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=next&oldid='.$oldid );
2658
2659                 $userlinks = $sk->userLink( $revision->getUser(), $revision->getUserText() )
2660                                                 . $sk->userToolLinks( $revision->getUser(), $revision->getUserText() );
2661
2662                 $m = wfMsg( 'revision-info-current' );
2663                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
2664                         ? 'revision-info-current'
2665                         : 'revision-info';
2666
2667                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsg( $infomsg, $td, $userlinks ) . "</div>\n" .
2668                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . wfMsg( 'revision-nav', $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
2669                 $wgOut->setSubtitle( $r );
2670         }
2671
2672         /**
2673          * This function is called right before saving the wikitext,
2674          * so we can do things like signatures and links-in-context.
2675          *
2676          * @param string $text
2677          */
2678         function preSaveTransform( $text ) {
2679                 global $wgParser, $wgUser;
2680                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2681         }
2682
2683         /* Caching functions */
2684
2685         /**
2686          * checkLastModified returns true if it has taken care of all
2687          * output to the client that is necessary for this request.
2688          * (that is, it has sent a cached version of the page)
2689          */
2690         function tryFileCache() {
2691                 static $called = false;
2692                 if( $called ) {
2693                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2694                         return;
2695                 }
2696                 $called = true;
2697                 if($this->isFileCacheable()) {
2698                         $touched = $this->mTouched;
2699                         $cache = new HTMLFileCache( $this->mTitle );
2700                         if($cache->isFileCacheGood( $touched )) {
2701                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2702                                 $cache->loadFromFileCache();
2703                                 return true;
2704                         } else {
2705                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2706                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2707                         }
2708                 } else {
2709                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2710                 }
2711         }
2712
2713         /**
2714          * Check if the page can be cached
2715          * @return bool
2716          */
2717         function isFileCacheable() {
2718                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest, $wgLang, $wgContLang;
2719                 $action    = $wgRequest->getVal( 'action'    );
2720                 $oldid     = $wgRequest->getVal( 'oldid'     );
2721                 $diff      = $wgRequest->getVal( 'diff'      );
2722                 $redirect  = $wgRequest->getVal( 'redirect'  );
2723                 $printable = $wgRequest->getVal( 'printable' );
2724                 $page      = $wgRequest->getVal( 'page' );
2725
2726                 //check for non-standard user language; this covers uselang,
2727                 //and extensions for auto-detecting user language.
2728                 $ulang     = $wgLang->getCode();
2729                 $clang     = $wgContLang->getCode();
2730
2731                 $cacheable = $wgUseFileCache
2732                         && (!$wgShowIPinHeader)
2733                         && ($this->getID() != 0)
2734                         && ($wgUser->isAnon())
2735                         && (!$wgUser->getNewtalk())
2736                         && ($this->mTitle->getNamespace() != NS_SPECIAL )
2737                         && (empty( $action ) || $action == 'view')
2738                         && (!isset($oldid))
2739                         && (!isset($diff))
2740                         && (!isset($redirect))
2741                         && (!isset($printable))
2742                         && !isset($page)
2743                         && (!$this->mRedirectedFrom)
2744                         && ($ulang === $clang);
2745
2746                 if ( $cacheable ) {
2747                         //extension may have reason to disable file caching on some pages.
2748                         $cacheable = wfRunHooks( 'IsFileCacheable', array( $this ) );
2749                 }
2750
2751                 return $cacheable;
2752         }
2753
2754         /**
2755          * Loads page_touched and returns a value indicating if it should be used
2756          *
2757          */
2758         function checkTouched() {
2759                 if( !$this->mDataLoaded ) {
2760                         $this->loadPageData();
2761                 }
2762                 return !$this->mIsRedirect;
2763         }
2764
2765         /**
2766          * Get the page_touched field
2767          */
2768         function getTouched() {
2769                 # Ensure that page data has been loaded
2770                 if( !$this->mDataLoaded ) {
2771                         $this->loadPageData();
2772                 }
2773                 return $this->mTouched;
2774         }
2775
2776         /**
2777          * Get the page_latest field
2778          */
2779         function getLatest() {
2780                 if ( !$this->mDataLoaded ) {
2781                         $this->loadPageData();
2782                 }
2783                 return $this->mLatest;
2784         }
2785
2786         /**
2787          * Edit an article without doing all that other stuff
2788          * The article must already exist; link tables etc
2789          * are not updated, caches are not flushed.
2790          *
2791          * @param string $text text submitted
2792          * @param string $comment comment submitted
2793          * @param bool $minor whereas it's a minor modification
2794          */
2795         function quickEdit( $text, $comment = '', $minor = 0 ) {
2796                 wfProfileIn( __METHOD__ );
2797
2798                 $dbw = wfGetDB( DB_MASTER );
2799                 $dbw->begin();
2800                 $revision = new Revision( array(
2801                         'page'       => $this->getId(),
2802                         'text'       => $text,
2803                         'comment'    => $comment,
2804                         'minor_edit' => $minor ? 1 : 0,
2805                         ) );
2806                 $revision->insertOn( $dbw );
2807                 $this->updateRevisionOn( $dbw, $revision );
2808                 $dbw->commit();
2809
2810                 wfProfileOut( __METHOD__ );
2811         }
2812
2813         /**
2814          * Used to increment the view counter
2815          *
2816          * @static
2817          * @param integer $id article id
2818          */
2819         function incViewCount( $id ) {
2820                 $id = intval( $id );
2821                 global $wgHitcounterUpdateFreq, $wgDBtype;
2822
2823                 $dbw = wfGetDB( DB_MASTER );
2824                 $pageTable = $dbw->tableName( 'page' );
2825                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
2826                 $acchitsTable = $dbw->tableName( 'acchits' );
2827
2828                 if( $wgHitcounterUpdateFreq <= 1 ) {
2829                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
2830                         return;
2831                 }
2832
2833                 # Not important enough to warrant an error page in case of failure
2834                 $oldignore = $dbw->ignoreErrors( true );
2835
2836                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
2837
2838                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
2839                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
2840                         # Most of the time (or on SQL errors), skip row count check
2841                         $dbw->ignoreErrors( $oldignore );
2842                         return;
2843                 }
2844
2845                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
2846                 $row = $dbw->fetchObject( $res );
2847                 $rown = intval( $row->n );
2848                 if( $rown >= $wgHitcounterUpdateFreq ){
2849                         wfProfileIn( 'Article::incViewCount-collect' );
2850                         $old_user_abort = ignore_user_abort( true );
2851
2852                         if ($wgDBtype == 'mysql')
2853                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
2854                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
2855                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
2856                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
2857                                 'GROUP BY hc_id');
2858                         $dbw->query("DELETE FROM $hitcounterTable");
2859                         if ($wgDBtype == 'mysql') {
2860                                 $dbw->query('UNLOCK TABLES');
2861                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
2862                                         'WHERE page_id = hc_id');
2863                         }
2864                         else {
2865                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
2866                                         "FROM $acchitsTable WHERE page_id = hc_id");
2867                         }
2868                         $dbw->query("DROP TABLE $acchitsTable");
2869
2870                         ignore_user_abort( $old_user_abort );
2871                         wfProfileOut( 'Article::incViewCount-collect' );
2872                 }
2873                 $dbw->ignoreErrors( $oldignore );
2874         }
2875
2876         /**#@+
2877          * The onArticle*() functions are supposed to be a kind of hooks
2878          * which should be called whenever any of the specified actions
2879          * are done.
2880          *
2881          * This is a good place to put code to clear caches, for instance.
2882          *
2883          * This is called on page move and undelete, as well as edit
2884          * @static
2885          * @param $title_obj a title object
2886          */
2887
2888         static function onArticleCreate($title) {
2889                 # The talk page isn't in the regular link tables, so we need to update manually:
2890                 if ( $title->isTalkPage() ) {
2891                         $other = $title->getSubjectPage();
2892                 } else {
2893                         $other = $title->getTalkPage();
2894                 }
2895                 $other->invalidateCache();
2896                 $other->purgeSquid();
2897
2898                 $title->touchLinks();
2899                 $title->purgeSquid();
2900                 $title->deleteTitleProtection();
2901         }
2902
2903         static function onArticleDelete( $title ) {
2904                 global $wgUseFileCache, $wgMessageCache;
2905
2906                 $title->touchLinks();
2907                 $title->purgeSquid();
2908
2909                 # File cache
2910                 if ( $wgUseFileCache ) {
2911                         $cm = new HTMLFileCache( $title );
2912                         @unlink( $cm->fileCacheName() );
2913                 }
2914
2915                 if( $title->getNamespace() == NS_MEDIAWIKI) {
2916                         $wgMessageCache->replace( $title->getDBkey(), false );
2917                 }
2918         }
2919
2920         /**
2921          * Purge caches on page update etc
2922          */
2923         static function onArticleEdit( $title ) {
2924                 global $wgDeferredUpdateList, $wgUseFileCache;
2925
2926                 // Invalidate caches of articles which include this page
2927                 $update = new HTMLCacheUpdate( $title, 'templatelinks' );
2928                 $wgDeferredUpdateList[] = $update;
2929
2930                 # Purge squid for this page only
2931                 $title->purgeSquid();
2932
2933                 # Clear file cache
2934                 if ( $wgUseFileCache ) {
2935                         $cm = new HTMLFileCache( $title );
2936                         @unlink( $cm->fileCacheName() );
2937                 }
2938         }
2939
2940         /**#@-*/
2941
2942         /**
2943          * Info about this page
2944          * Called for ?action=info when $wgAllowPageInfo is on.
2945          *
2946          * @public
2947          */
2948         function info() {
2949                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
2950
2951                 if ( !$wgAllowPageInfo ) {
2952                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
2953                         return;
2954                 }
2955
2956                 $page = $this->mTitle->getSubjectPage();
2957
2958                 $wgOut->setPagetitle( $page->getPrefixedText() );
2959                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
2960                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ) );
2961
2962                 if( !$this->mTitle->exists() ) {
2963                         $wgOut->addHtml( '<div class="noarticletext">' );
2964                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2965                                 // This doesn't quite make sense; the user is asking for
2966                                 // information about the _page_, not the message... -- RC
2967                                 $wgOut->addHtml( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
2968                         } else {
2969                                 $msg = $wgUser->isLoggedIn()
2970                                         ? 'noarticletext'
2971                                         : 'noarticletextanon';
2972                                 $wgOut->addHtml( wfMsgExt( $msg, 'parse' ) );
2973                         }
2974                         $wgOut->addHtml( '</div>' );
2975                 } else {
2976                         $dbr = wfGetDB( DB_SLAVE );
2977                         $wl_clause = array(
2978                                 'wl_title'     => $page->getDBkey(),
2979                                 'wl_namespace' => $page->getNamespace() );
2980                         $numwatchers = $dbr->selectField(
2981                                 'watchlist',
2982                                 'COUNT(*)',
2983                                 $wl_clause,
2984                                 __METHOD__,
2985                                 $this->getSelectOptions() );
2986
2987                         $pageInfo = $this->pageCountInfo( $page );
2988                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
2989
2990                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
2991                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
2992                         if( $talkInfo ) {
2993                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
2994                         }
2995                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
2996                         if( $talkInfo ) {
2997                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
2998                         }
2999                         $wgOut->addHTML( '</ul>' );
3000
3001                 }
3002         }
3003
3004         /**
3005          * Return the total number of edits and number of unique editors
3006          * on a given page. If page does not exist, returns false.
3007          *
3008          * @param Title $title
3009          * @return array
3010          * @private
3011          */
3012         function pageCountInfo( $title ) {
3013                 $id = $title->getArticleId();
3014                 if( $id == 0 ) {
3015                         return false;
3016                 }
3017
3018                 $dbr = wfGetDB( DB_SLAVE );
3019
3020                 $rev_clause = array( 'rev_page' => $id );
3021
3022                 $edits = $dbr->selectField(
3023                         'revision',
3024                         'COUNT(rev_page)',
3025                         $rev_clause,
3026                         __METHOD__,
3027                         $this->getSelectOptions() );
3028
3029                 $authors = $dbr->selectField(
3030                         'revision',
3031                         'COUNT(DISTINCT rev_user_text)',
3032                         $rev_clause,
3033                         __METHOD__,
3034                         $this->getSelectOptions() );
3035
3036                 return array( 'edits' => $edits, 'authors' => $authors );
3037         }
3038
3039         /**
3040          * Return a list of templates used by this article.
3041          * Uses the templatelinks table
3042          *
3043          * @return array Array of Title objects
3044          */
3045         function getUsedTemplates() {
3046                 $result = array();
3047                 $id = $this->mTitle->getArticleID();
3048                 if( $id == 0 ) {
3049                         return array();
3050                 }
3051
3052                 $dbr = wfGetDB( DB_SLAVE );
3053                 $res = $dbr->select( array( 'templatelinks' ),
3054                         array( 'tl_namespace', 'tl_title' ),
3055                         array( 'tl_from' => $id ),
3056                         'Article:getUsedTemplates' );
3057                 if ( false !== $res ) {
3058                         if ( $dbr->numRows( $res ) ) {
3059                                 while ( $row = $dbr->fetchObject( $res ) ) {
3060                                         $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3061                                 }
3062                         }
3063                 }
3064                 $dbr->freeResult( $res );
3065                 return $result;
3066         }
3067
3068         /**
3069          * Return an auto-generated summary if the text provided is a redirect.
3070          *
3071          * @param  string $text The wikitext to check
3072          * @return string '' or an appropriate summary
3073          */
3074         public static function getRedirectAutosummary( $text ) {
3075                 $rt = Title::newFromRedirect( $text );
3076                 if( is_object( $rt ) )
3077                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3078                 else
3079                         return '';
3080         }
3081
3082         /**
3083          * Return an auto-generated summary if the new text is much shorter than
3084          * the old text.
3085          *
3086          * @param  string $oldtext The previous text of the page
3087          * @param  string $text    The submitted text of the page
3088          * @return string An appropriate autosummary, or an empty string.
3089          */
3090         public static function getBlankingAutosummary( $oldtext, $text ) {
3091                 if ($oldtext!='' && $text=='') {
3092                         return wfMsgForContent('autosumm-blank');
3093                 } elseif (strlen($oldtext) > 10 * strlen($text) && strlen($text) < 500) {
3094                         #Removing more than 90% of the article
3095                         global $wgContLang;
3096                         $truncatedtext = $wgContLang->truncate($text, max(0, 200 - strlen(wfMsgForContent('autosumm-replace'))), '...');
3097                         return wfMsgForContent('autosumm-replace', $truncatedtext);
3098                 } else {
3099                         return '';
3100                 }
3101         }
3102
3103         /**
3104         * Return an applicable autosummary if one exists for the given edit.
3105         * @param string $oldtext The previous text of the page.
3106         * @param string $newtext The submitted text of the page.
3107         * @param bitmask $flags A bitmask of flags submitted for the edit.
3108         * @return string An appropriate autosummary, or an empty string.
3109         */
3110         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3111
3112                 # This code is UGLY UGLY UGLY.
3113                 # Somebody PLEASE come up with a more elegant way to do it.
3114
3115                 #Redirect autosummaries
3116                 $summary = self::getRedirectAutosummary( $newtext );
3117
3118                 if ($summary)
3119                         return $summary;
3120
3121                 #Blanking autosummaries
3122                 if (!($flags & EDIT_NEW))
3123                         $summary = self::getBlankingAutosummary( $oldtext, $newtext );
3124
3125                 if ($summary)
3126                         return $summary;
3127
3128                 #New page autosummaries
3129                 if ($flags & EDIT_NEW && strlen($newtext)) {
3130                         #If they're making a new article, give its text, truncated, in the summary.
3131                         global $wgContLang;
3132                         $truncatedtext = $wgContLang->truncate(
3133                                 str_replace("\n", ' ', $newtext),
3134                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new') ) ),
3135                                 '...' );
3136                         $summary = wfMsgForContent( 'autosumm-new', $truncatedtext );
3137                 }
3138
3139                 if ($summary)
3140                         return $summary;
3141
3142                 return $summary;
3143         }
3144
3145         /**
3146          * Add the primary page-view wikitext to the output buffer
3147          * Saves the text into the parser cache if possible.
3148          * Updates templatelinks if it is out of date.
3149          *
3150          * @param string  $text
3151          * @param bool    $cache
3152          */
3153         public function outputWikiText( $text, $cache = true ) {
3154                 global $wgParser, $wgUser, $wgOut;
3155
3156                 $popts = $wgOut->parserOptions();
3157                 $popts->setTidy(true);
3158                 $popts->enableLimitReport();
3159                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3160                         $popts, true, true, $this->getRevIdFetched() );
3161                 $popts->setTidy(false);
3162                 $popts->enableLimitReport( false );
3163                 if ( $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3164                         $parserCache =& ParserCache::singleton();
3165                         $parserCache->save( $parserOutput, $this, $wgUser );
3166                 }
3167
3168                 if ( !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3169                         // templatelinks table may have become out of sync,
3170                         // especially if using variable-based transclusions.
3171                         // For paranoia, check if things have changed and if
3172                         // so apply updates to the database. This will ensure
3173                         // that cascaded protections apply as soon as the changes
3174                         // are visible.
3175
3176                         # Get templates from templatelinks
3177                         $id = $this->mTitle->getArticleID();
3178
3179                         $tlTemplates = array();
3180
3181                         $dbr = wfGetDB( DB_SLAVE );
3182                         $res = $dbr->select( array( 'templatelinks' ),
3183                                 array( 'tl_namespace', 'tl_title' ),
3184                                 array( 'tl_from' => $id ),
3185                                 'Article:getUsedTemplates' );
3186
3187                         global $wgContLang;
3188
3189                         if ( false !== $res ) {
3190                                 if ( $dbr->numRows( $res ) ) {
3191                                         while ( $row = $dbr->fetchObject( $res ) ) {
3192                                                 $tlTemplates[] = $wgContLang->getNsText( $row->tl_namespace ) . ':' . $row->tl_title ;
3193                                         }
3194                                 }
3195                         }
3196
3197                         # Get templates from parser output.
3198                         $poTemplates_allns = $parserOutput->getTemplates();
3199
3200                         $poTemplates = array ();
3201                         foreach ( $poTemplates_allns as $ns_templates ) {
3202                                 $poTemplates = array_merge( $poTemplates, $ns_templates );
3203                         }
3204
3205                         # Get the diff
3206                         $templates_diff = array_diff( $poTemplates, $tlTemplates );
3207
3208                         if ( count( $templates_diff ) > 0 ) {
3209                                 # Whee, link updates time.
3210                                 $u = new LinksUpdate( $this->mTitle, $parserOutput );
3211
3212                                 $dbw = wfGetDb( DB_MASTER );
3213                                 $dbw->begin();
3214
3215                                 $u->doUpdate();
3216
3217                                 $dbw->commit();
3218                         }
3219                 }
3220
3221                 $wgOut->addParserOutput( $parserOutput );
3222         }
3223
3224 }