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