includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @file
   5  */
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * See design.txt for an overview.
  11  * Note: edit user interface and cache support functions have been
  12  * moved to separate EditPage and HTMLFileCache classes.
  13  *
  14  */
  15 class Article {
  16         /**@{{
  17          * @private
  18          */
  19         var $mComment = '';               //!<
  20         var $mContent;                    //!<
  21         var $mContentLoaded = false;      //!<
  22         var $mCounter = -1;               //!< Not loaded
  23         var $mCurID = -1;                 //!< Not loaded
  24         var $mDataLoaded = false;         //!<
  25         var $mForUpdate = false;          //!<
  26         var $mGoodAdjustment = 0;         //!<
  27         var $mIsRedirect = false;         //!<
  28         var $mLatest = false;             //!<
  29         var $mMinorEdit;                  //!<
  30         var $mOldId;                      //!<
  31         var $mPreparedEdit = false;       //!< Title object if set
  32         var $mRedirectedFrom = null;      //!< Title object if set
  33         var $mRedirectTarget = null;      //!< Title object if set
  34         var $mRedirectUrl = false;        //!<
  35         var $mRevIdFetched = 0;           //!<
  36         var $mRevision;                   //!<
  37         var $mTimestamp = '';             //!<
  38         var $mTitle;                      //!<
  39         var $mTotalAdjustment = 0;        //!<
  40         var $mTouched = '19700101000000'; //!<
  41         var $mUser = -1;                  //!< Not loaded
  42         var $mUserText = '';              //!<
  43         var $mParserOptions;              //!<
  44         var $mParserOutput;               //!<
  45         /**@}}*/
  46
  47         /**
  48          * Constructor and clear the article
  49          * @param $title Reference to a Title object.
  50          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  51          */
  52         public function __construct( Title $title, $oldId = null ) {
  53                 $this->mTitle =& $title;
  54                 $this->mOldId = $oldId;
  55         }
  56
  57         /**
  58          * Constructor from an article article
  59          * @param $id The article ID to load
  60          */
  61         public static function newFromID( $id ) {
  62                 $t = Title::newFromID( $id );
  63                 return $t == null ? null : new Article( $t );
  64         }
  65
  66         /**
  67          * Tell the page view functions that this view was redirected
  68          * from another page on the wiki.
  69          * @param $from Title object.
  70          */
  71         public function setRedirectedFrom( $from ) {
  72                 $this->mRedirectedFrom = $from;
  73         }
  74
  75         /**
  76          * If this page is a redirect, get its target
  77          *
  78          * The target will be fetched from the redirect table if possible.
  79          * If this page doesn't have an entry there, call insertRedirect()
  80          * @return mixed Title object, or null if this page is not a redirect
  81          */
  82         public function getRedirectTarget() {
  83                 if( !$this->mTitle || !$this->mTitle->isRedirect() )
  84                         return null;
  85                 if( !is_null($this->mRedirectTarget) )
  86                         return $this->mRedirectTarget;
  87                 # Query the redirect table
  88                 $dbr = wfGetDB( DB_SLAVE );
  89                 $row = $dbr->selectRow( 'redirect',
  90                         array('rd_namespace', 'rd_title'),
  91                         array('rd_from' => $this->getID() ),
  92                         __METHOD__
  93                 );
  94                 if( $row ) {
  95                         return $this->mRedirectTarget = Title::makeTitle($row->rd_namespace, $row->rd_title);
  96                 }
  97                 # This page doesn't have an entry in the redirect table
  98                 return $this->mRedirectTarget = $this->insertRedirect();
  99         }
 100
 101         /**
 102          * Insert an entry for this page into the redirect table.
 103          *
 104          * Don't call this function directly unless you know what you're doing.
 105          * @return Title object
 106          */
 107         public function insertRedirect() {
 108                 $retval = Title::newFromRedirect( $this->getContent() );
 109                 if( !$retval ) {
 110                         return null;
 111                 }
 112                 $dbw = wfGetDB( DB_MASTER );
 113                 $dbw->replace( 'redirect', array('rd_from'),
 114                         array(
 115                                 'rd_from' => $this->getID(),
 116                                 'rd_namespace' => $retval->getNamespace(),
 117                                 'rd_title' => $retval->getDBkey()
 118                         ),
 119                         __METHOD__
 120                 );
 121                 return $retval;
 122         }
 123
 124         /**
 125          * Get the Title object this page redirects to
 126          *
 127          * @return mixed false, Title of in-wiki target, or string with URL
 128          */
 129         public function followRedirect() {
 130                 $text = $this->getContent();
 131                 return $this->followRedirectText( $text );
 132         }
 133
 134         /**
 135          * Get the Title object this text redirects to
 136          *
 137          * @return mixed false, Title of in-wiki target, or string with URL
 138          */
 139         public function followRedirectText( $text ) {
 140                 $rt = Title::newFromRedirectRecurse( $text ); // recurse through to only get the final target
 141                 # process if title object is valid and not special:userlogout
 142                 if( $rt ) {
 143                         if( $rt->getInterwiki() != '' ) {
 144                                 if( $rt->isLocal() ) {
 145                                         // Offsite wikis need an HTTP redirect.
 146                                         //
 147                                         // This can be hard to reverse and may produce loops,
 148                                         // so they may be disabled in the site configuration.
 149                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 150                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 151                                 }
 152                         } else {
 153                                 if( $rt->getNamespace() == NS_SPECIAL ) {
 154                                         // Gotta handle redirects to special pages differently:
 155                                         // Fill the HTTP response "Location" header and ignore
 156                                         // the rest of the page we're on.
 157                                         //
 158                                         // This can be hard to reverse, so they may be disabled.
 159                                         if( $rt->isSpecial( 'Userlogout' ) ) {
 160                                                 // rolleyes
 161                                         } else {
 162                                                 return $rt->getFullURL();
 163                                         }
 164                                 }
 165                                 return $rt;
 166                         }
 167                 }
 168                 // No or invalid redirect
 169                 return false;
 170         }
 171
 172         /**
 173          * get the title object of the article
 174          */
 175         public function getTitle() {
 176                 return $this->mTitle;
 177         }
 178
 179         /**
 180          * Clear the object
 181          * @private
 182          */
 183         public function clear() {
 184                 $this->mDataLoaded    = false;
 185                 $this->mContentLoaded = false;
 186
 187                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 188                 $this->mRedirectedFrom = null; # Title object if set
 189                 $this->mRedirectTarget = null; # Title object if set
 190                 $this->mUserText =
 191                 $this->mTimestamp = $this->mComment = '';
 192                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 193                 $this->mTouched = '19700101000000';
 194                 $this->mForUpdate = false;
 195                 $this->mIsRedirect = false;
 196                 $this->mRevIdFetched = 0;
 197                 $this->mRedirectUrl = false;
 198                 $this->mLatest = false;
 199                 $this->mPreparedEdit = false;
 200         }
 201
 202         /**
 203          * Note that getContent/loadContent do not follow redirects anymore.
 204          * If you need to fetch redirectable content easily, try
 205          * the shortcut in Article::followContent()
 206          *
 207          * @return Return the text of this revision
 208         */
 209         public function getContent() {
 210                 global $wgUser, $wgContLang, $wgOut, $wgMessageCache;
 211                 wfProfileIn( __METHOD__ );
 212                 if( $this->getID() === 0 ) {
 213                         # If this is a MediaWiki:x message, then load the messages
 214                         # and return the message value for x.
 215                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 216                                 # If this is a system message, get the default text.
 217                                 list( $message, $lang ) = $wgMessageCache->figureMessage( $wgContLang->lcfirst( $this->mTitle->getText() ) );
 218                                 $wgMessageCache->loadAllMessages( $lang );
 219                                 $text = wfMsgGetKey( $message, false, $lang, false );
 220                                 if( wfEmptyMsg( $message, $text ) )
 221                                         $text = '';
 222                         } else {
 223                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 224                         }
 225                         wfProfileOut( __METHOD__ );
 226                         return $text;
 227                 } else {
 228                         $this->loadContent();
 229                         wfProfileOut( __METHOD__ );
 230                         return $this->mContent;
 231                 }
 232         }
 233
 234         /**
 235          * Get the text of the current revision. No side-effects...
 236          *
 237          * @return Return the text of the current revision
 238         */
 239         public function getRawText() {
 240                 // Check process cache for current revision
 241                 if( $this->mContentLoaded && $this->mOldId == 0 ) {
 242                         return $this->mContent;
 243                 }
 244                 $rev = Revision::newFromTitle( $this->mTitle );
 245                 $text = $rev ? $rev->getRawText() : false;
 246                 return $text;
 247         }
 248
 249         /**
 250          * This function returns the text of a section, specified by a number ($section).
 251          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 252          * the first section before any such heading (section 0).
 253          *
 254          * If a section contains subsections, these are also returned.
 255          *
 256          * @param $text String: text to look in
 257          * @param $section Integer: section number
 258          * @return string text of the requested section
 259          * @deprecated
 260          */
 261         public function getSection( $text, $section ) {
 262                 global $wgParser;
 263                 return $wgParser->getSection( $text, $section );
 264         }
 265
 266         /**
 267          * Get the text that needs to be saved in order to undo all revisions
 268          * between $undo and $undoafter. Revisions must belong to the same page,
 269          * must exist and must not be deleted
 270          * @param $undo Revision
 271          * @param $undoafter Revision Must be an earlier revision than $undo
 272          * @return mixed string on success, false on failure
 273          */
 274         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 275                 $undo_text = $undo->getText();
 276                 $undoafter_text = $undoafter->getText();
 277                 $cur_text = $this->getContent();
 278                 if ( $cur_text == $undo_text ) {
 279                         # No use doing a merge if it's just a straight revert.
 280                         return $undoafter_text;
 281                 }
 282                 $undone_text = '';
 283                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) )
 284                         return false;
 285                 return $undone_text;
 286         }
 287
 288         /**
 289          * @return int The oldid of the article that is to be shown, 0 for the
 290          *             current revision
 291          */
 292         public function getOldID() {
 293                 if( is_null( $this->mOldId ) ) {
 294                         $this->mOldId = $this->getOldIDFromRequest();
 295                 }
 296                 return $this->mOldId;
 297         }
 298
 299         /**
 300          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 301          *
 302          * @return int The old id for the request
 303          */
 304         public function getOldIDFromRequest() {
 305                 global $wgRequest;
 306                 $this->mRedirectUrl = false;
 307                 $oldid = $wgRequest->getVal( 'oldid' );
 308                 if( isset( $oldid ) ) {
 309                         $oldid = intval( $oldid );
 310                         if( $wgRequest->getVal( 'direction' ) == 'next' ) {
 311                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 312                                 if( $nextid  ) {
 313                                         $oldid = $nextid;
 314                                 } else {
 315                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 316                                 }
 317                         } elseif( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 318                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 319                                 if( $previd ) {
 320                                         $oldid = $previd;
 321                                 }
 322                         }
 323                 }
 324                 if( !$oldid ) {
 325                         $oldid = 0;
 326                 }
 327                 return $oldid;
 328         }
 329
 330         /**
 331          * Load the revision (including text) into this object
 332          */
 333         function loadContent() {
 334                 if( $this->mContentLoaded ) return;
 335                 wfProfileIn( __METHOD__ );
 336                 # Query variables :P
 337                 $oldid = $this->getOldID();
 338                 # Pre-fill content with error message so that if something
 339                 # fails we'll have something telling us what we intended.
 340                 $this->mOldId = $oldid;
 341                 $this->fetchContent( $oldid );
 342                 wfProfileOut( __METHOD__ );
 343         }
 344
 345
 346         /**
 347          * Fetch a page record with the given conditions
 348          * @param $dbr Database object
 349          * @param $conditions Array
 350          */
 351         protected function pageData( $dbr, $conditions ) {
 352                 $fields = array(
 353                                 'page_id',
 354                                 'page_namespace',
 355                                 'page_title',
 356                                 'page_restrictions',
 357                                 'page_counter',
 358                                 'page_is_redirect',
 359                                 'page_is_new',
 360                                 'page_random',
 361                                 'page_touched',
 362                                 'page_latest',
 363                                 'page_len',
 364                 );
 365                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 366                 $row = $dbr->selectRow(
 367                         'page',
 368                         $fields,
 369                         $conditions,
 370                         __METHOD__
 371                 );
 372                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 373                 return $row ;
 374         }
 375
 376         /**
 377          * @param $dbr Database object
 378          * @param $title Title object
 379          */
 380         public function pageDataFromTitle( $dbr, $title ) {
 381                 return $this->pageData( $dbr, array(
 382                         'page_namespace' => $title->getNamespace(),
 383                         'page_title'     => $title->getDBkey() ) );
 384         }
 385
 386         /**
 387          * @param $dbr Database
 388          * @param $id Integer
 389          */
 390         protected function pageDataFromId( $dbr, $id ) {
 391                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 392         }
 393
 394         /**
 395          * Set the general counter, title etc data loaded from
 396          * some source.
 397          *
 398          * @param $data Database row object or "fromdb"
 399          */
 400         public function loadPageData( $data = 'fromdb' ) {
 401                 if( $data === 'fromdb' ) {
 402                         $dbr = wfGetDB( DB_MASTER );
 403                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 404                 }
 405
 406                 $lc = LinkCache::singleton();
 407                 if( $data ) {
 408                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 409
 410                         $this->mTitle->mArticleID = intval( $data->page_id );
 411
 412                         # Old-fashioned restrictions
 413                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 414
 415                         $this->mCounter     = intval( $data->page_counter );
 416                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 417                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 418                         $this->mLatest      = intval( $data->page_latest );
 419                 } else {
 420                         if( is_object( $this->mTitle ) ) {
 421                                 $lc->addBadLinkObj( $this->mTitle );
 422                         }
 423                         $this->mTitle->mArticleID = 0;
 424                 }
 425
 426                 $this->mDataLoaded  = true;
 427         }
 428
 429         /**
 430          * Get text of an article from database
 431          * Does *NOT* follow redirects.
 432          * @param $oldid Int: 0 for whatever the latest revision is
 433          * @return string
 434          */
 435         function fetchContent( $oldid = 0 ) {
 436                 if( $this->mContentLoaded ) {
 437                         return $this->mContent;
 438                 }
 439
 440                 $dbr = wfGetDB( DB_MASTER );
 441
 442                 # Pre-fill content with error message so that if something
 443                 # fails we'll have something telling us what we intended.
 444                 $t = $this->mTitle->getPrefixedText();
 445                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 446                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 447
 448                 if( $oldid ) {
 449                         $revision = Revision::newFromId( $oldid );
 450                         if( is_null( $revision ) ) {
 451                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 452                                 return false;
 453                         }
 454                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 455                         if( !$data ) {
 456                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 457                                 return false;
 458                         }
 459                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 460                         $this->loadPageData( $data );
 461                 } else {
 462                         if( !$this->mDataLoaded ) {
 463                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 464                                 if( !$data ) {
 465                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 466                                         return false;
 467                                 }
 468                                 $this->loadPageData( $data );
 469                         }
 470                         $revision = Revision::newFromId( $this->mLatest );
 471                         if( is_null( $revision ) ) {
 472                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$this->mLatest}\n" );
 473                                 return false;
 474                         }
 475                 }
 476
 477                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 478                 // We should instead work with the Revision object when we need it...
 479                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 480
 481                 $this->mUser      = $revision->getUser();
 482                 $this->mUserText  = $revision->getUserText();
 483                 $this->mComment   = $revision->getComment();
 484                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 485
 486                 $this->mRevIdFetched = $revision->getId();
 487                 $this->mContentLoaded = true;
 488                 $this->mRevision =& $revision;
 489
 490                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 491
 492                 return $this->mContent;
 493         }
 494
 495         /**
 496          * Read/write accessor to select FOR UPDATE
 497          *
 498          * @param $x Mixed: FIXME
 499          */
 500         public function forUpdate( $x = NULL ) {
 501                 return wfSetVar( $this->mForUpdate, $x );
 502         }
 503
 504         /**
 505          * Get the database which should be used for reads
 506          *
 507          * @return Database
 508          * @deprecated - just call wfGetDB( DB_MASTER ) instead
 509          */
 510         function getDB() {
 511                 wfDeprecated( __METHOD__ );
 512                 return wfGetDB( DB_MASTER );
 513         }
 514
 515         /**
 516          * Get options for all SELECT statements
 517          *
 518          * @param $options Array: an optional options array which'll be appended to
 519          *                       the default
 520          * @return Array: options
 521          */
 522         protected function getSelectOptions( $options = '' ) {
 523                 if( $this->mForUpdate ) {
 524                         if( is_array( $options ) ) {
 525                                 $options[] = 'FOR UPDATE';
 526                         } else {
 527                                 $options = 'FOR UPDATE';
 528                         }
 529                 }
 530                 return $options;
 531         }
 532
 533         /**
 534          * @return int Page ID
 535          */
 536         public function getID() {
 537                 if( $this->mTitle ) {
 538                         return $this->mTitle->getArticleID();
 539                 } else {
 540                         return 0;
 541                 }
 542         }
 543
 544         /**
 545          * @return bool Whether or not the page exists in the database
 546          */
 547         public function exists() {
 548                 return $this->getId() > 0;
 549         }
 550
 551         /**
 552          * Check if this page is something we're going to be showing
 553          * some sort of sensible content for. If we return false, page
 554          * views (plain action=view) will return an HTTP 404 response,
 555          * so spiders and robots can know they're following a bad link.
 556          *
 557          * @return bool
 558          */
 559         public function hasViewableContent() {
 560                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 561         }
 562
 563         /**
 564          * @return int The view count for the page
 565          */
 566         public function getCount() {
 567                 if( -1 == $this->mCounter ) {
 568                         $id = $this->getID();
 569                         if( $id == 0 ) {
 570                                 $this->mCounter = 0;
 571                         } else {
 572                                 $dbr = wfGetDB( DB_SLAVE );
 573                                 $this->mCounter = $dbr->selectField( 'page',
 574                                         'page_counter',
 575                                         array( 'page_id' => $id ),
 576                                         __METHOD__,
 577                                         $this->getSelectOptions()
 578                                 );
 579                         }
 580                 }
 581                 return $this->mCounter;
 582         }
 583
 584         /**
 585          * Determine whether a page  would be suitable for being counted as an
 586          * article in the site_stats table based on the title & its content
 587          *
 588          * @param $text String: text to analyze
 589          * @return bool
 590          */
 591         public function isCountable( $text ) {
 592                 global $wgUseCommaCount;
 593
 594                 $token = $wgUseCommaCount ? ',' : '[[';
 595                 return $this->mTitle->isContentPage() && !$this->isRedirect($text) && in_string($token,$text);
 596         }
 597
 598         /**
 599          * Tests if the article text represents a redirect
 600          *
 601          * @param $text String: FIXME
 602          * @return bool
 603          */
 604         public function isRedirect( $text = false ) {
 605                 if( $text === false ) {
 606                         if( $this->mDataLoaded ) {
 607                                 return $this->mIsRedirect;
 608                         }
 609                         // Apparently loadPageData was never called
 610                         $this->loadContent();
 611                         $titleObj = Title::newFromRedirectRecurse( $this->fetchContent() );
 612                 } else {
 613                         $titleObj = Title::newFromRedirect( $text );
 614                 }
 615                 return $titleObj !== NULL;
 616         }
 617
 618         /**
 619          * Returns true if the currently-referenced revision is the current edit
 620          * to this page (and it exists).
 621          * @return bool
 622          */
 623         public function isCurrent() {
 624                 # If no oldid, this is the current version.
 625                 if( $this->getOldID() == 0 ) {
 626                         return true;
 627                 }
 628                 return $this->exists() && isset($this->mRevision) && $this->mRevision->isCurrent();
 629         }
 630
 631         /**
 632          * Loads everything except the text
 633          * This isn't necessary for all uses, so it's only done if needed.
 634          */
 635         protected function loadLastEdit() {
 636                 if( -1 != $this->mUser )
 637                         return;
 638
 639                 # New or non-existent articles have no user information
 640                 $id = $this->getID();
 641                 if( 0 == $id ) return;
 642
 643                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 644                 if( !is_null( $this->mLastRevision ) ) {
 645                         $this->mUser      = $this->mLastRevision->getUser();
 646                         $this->mUserText  = $this->mLastRevision->getUserText();
 647                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 648                         $this->mComment   = $this->mLastRevision->getComment();
 649                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 650                         $this->mRevIdFetched = $this->mLastRevision->getId();
 651                 }
 652         }
 653
 654         public function getTimestamp() {
 655                 // Check if the field has been filled by ParserCache::get()
 656                 if( !$this->mTimestamp ) {
 657                         $this->loadLastEdit();
 658                 }
 659                 return wfTimestamp(TS_MW, $this->mTimestamp);
 660         }
 661
 662         public function getUser() {
 663                 $this->loadLastEdit();
 664                 return $this->mUser;
 665         }
 666
 667         public function getUserText() {
 668                 $this->loadLastEdit();
 669                 return $this->mUserText;
 670         }
 671
 672         public function getComment() {
 673                 $this->loadLastEdit();
 674                 return $this->mComment;
 675         }
 676
 677         public function getMinorEdit() {
 678                 $this->loadLastEdit();
 679                 return $this->mMinorEdit;
 680         }
 681
 682         /* Use this to fetch the rev ID used on page views */
 683         public function getRevIdFetched() {
 684                 $this->loadLastEdit();
 685                 return $this->mRevIdFetched;
 686         }
 687
 688         /**
 689          * @param $limit Integer: default 0.
 690          * @param $offset Integer: default 0.
 691          */
 692         public function getContributors($limit = 0, $offset = 0) {
 693                 # XXX: this is expensive; cache this info somewhere.
 694
 695                 $dbr = wfGetDB( DB_SLAVE );
 696                 $revTable = $dbr->tableName( 'revision' );
 697                 $userTable = $dbr->tableName( 'user' );
 698
 699                 $pageId = $this->getId();
 700
 701                 $user = $this->getUser();
 702                 if ( $user ) {
 703                         $excludeCond = "AND rev_user != $user";
 704                 } else {
 705                         $userText = $dbr->addQuotes( $this->getUserText() );
 706                         $excludeCond = "AND rev_user_text != $userText";
 707                 }
 708
 709                 $deletedBit = $dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER ); // username hidden?
 710
 711                 $sql = "SELECT {$userTable}.*, rev_user_text as user_name, MAX(rev_timestamp) as timestamp
 712                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 713                         WHERE rev_page = $pageId
 714                         $excludeCond
 715                         AND $deletedBit = 0
 716                         GROUP BY rev_user, rev_user_text
 717                         ORDER BY timestamp DESC";
 718
 719                 if ( $limit > 0 )
 720                         $sql = $dbr->limitResult( $sql, $limit, $offset );
 721
 722                 $sql .= ' ' . $this->getSelectOptions();
 723                 $res = $dbr->query( $sql, __METHOD__ );
 724
 725                 return new UserArrayFromResult( $res );
 726         }
 727
 728         /**
 729          * This is the default action of the index.php entry point: just view the
 730          * page of the given title.
 731         */
 732         public function view() {
 733                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 734                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 735                 global $wgUseTrackbacks, $wgUseFileCache;
 736
 737                 wfProfileIn( __METHOD__ );
 738
 739                 # Get variables from query string
 740                 $oldid = $this->getOldID();
 741                 $parserCache = ParserCache::singleton();
 742
 743                 $parserOptions = clone $this->getParserOptions();
 744                 # Render printable version, use printable version cache
 745                 if ( $wgOut->isPrintable() ) {
 746                         $parserOptions->setIsPrintable( true );
 747                 }
 748
 749                 # Try client and file cache
 750                 if( $oldid === 0 && $this->checkTouched() ) {
 751                         global $wgUseETag;
 752                         if( $wgUseETag ) {
 753                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 754                         }
 755                         # Is is client cached?
 756                         if( $wgOut->checkLastModified( $this->getTouched() ) ) {
 757                                 wfDebug( __METHOD__.": done 304\n" );
 758                                 wfProfileOut( __METHOD__ );
 759                                 return;
 760                         # Try file cache
 761                         } else if( $wgUseFileCache && $this->tryFileCache() ) {
 762                                 wfDebug( __METHOD__.": done file cache\n" );
 763                                 # tell wgOut that output is taken care of
 764                                 $wgOut->disable();
 765                                 $this->viewUpdates();
 766                                 wfProfileOut( __METHOD__ );
 767                                 return;
 768                         }
 769                 }
 770
 771                 $sk = $wgUser->getSkin();
 772
 773                 # getOldID may want us to redirect somewhere else
 774                 if( $this->mRedirectUrl ) {
 775                         $wgOut->redirect( $this->mRedirectUrl );
 776                         wfDebug( __METHOD__.": redirecting due to oldid\n" );
 777                         wfProfileOut( __METHOD__ );
 778                         return;
 779                 }
 780
 781                 $wgOut->setArticleFlag( true );
 782                 # Set page title (may be overridden by DISPLAYTITLE)
 783                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 784
 785                 # If we got diff in the query, we want to see a diff page instead of the article.
 786                 if( !is_null( $wgRequest->getVal( 'diff' ) ) ) {
 787                         wfDebug( __METHOD__.": showing diff page\n" );
 788                         $this->showDiffPage();
 789                         wfProfileOut( __METHOD__ );
 790                         return;
 791                 }
 792
 793                 # Should the parser cache be used?
 794                 $useParserCache = $this->useParserCache( $oldid );
 795                 wfDebug( 'Article::view using parser cache: ' . ($useParserCache ? 'yes' : 'no' ) . "\n" );
 796                 if( $wgUser->getOption( 'stubthreshold' ) ) {
 797                         wfIncrStats( 'pcache_miss_stub' );
 798                 }
 799
 800                 # For the main page, overwrite the <title> element with the con-
 801                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 802                 # that's not empty).
 803                 if( $this->mTitle->equals( Title::newMainPage() )
 804                         && ($m=wfMsgForContent( 'pagetitle-view-mainpage' )) !== '' )
 805                 {
 806                         $wgOut->setHTMLTitle( $m );
 807                 }
 808
 809                 $wasRedirected = $this->showRedirectedFromHeader();
 810                 $this->showNamespaceHeader();
 811
 812                 # Iterate through the possible ways of constructing the output text.
 813                 # Keep going until $outputDone is set, or we run out of things to do.
 814                 $pass = 0;
 815                 $outputDone = false;
 816                 while( !$outputDone && ++$pass ){
 817                         switch( $pass ){
 818                                 case 1:
 819                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 820                                         break;
 821
 822                                 case 2:
 823                                         # Try the parser cache
 824                                         if( $useParserCache ) {
 825                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 826                                                 if ( $this->mParserOutput !== false ) {
 827                                                         wfDebug( __METHOD__.": showing parser cache contents\n" );
 828                                                         $wgOut->addParserOutput( $this->mParserOutput );
 829                                                         # Ensure that UI elements requiring revision ID have
 830                                                         # the correct version information.
 831                                                         $wgOut->setRevisionId( $this->mLatest );
 832                                                         $outputDone = true;
 833                                                 }
 834                                         }
 835                                         break;
 836
 837                                 case 3:
 838                                         $text = $this->getContent();
 839                                         if( $text === false || $this->getID() == 0 ) {
 840                                                 wfDebug( __METHOD__.": showing missing article\n" );
 841                                                 $this->showMissingArticle();
 842                                                 wfProfileOut( __METHOD__ );
 843                                                 return;
 844                                         }
 845
 846                                         # Another whitelist check in case oldid is altering the title
 847                                         if( !$this->mTitle->userCanRead() ) {
 848                                                 wfDebug( __METHOD__.": denied on secondary read check\n" );
 849                                                 $wgOut->loginToUse();
 850                                                 $wgOut->output();
 851                                                 $wgOut->disable();
 852                                                 wfProfileOut( __METHOD__ );
 853                                                 return;
 854                                         }
 855
 856                                         # Are we looking at an old revision
 857                                         if( $oldid && !is_null( $this->mRevision ) ) {
 858                                                 $this->setOldSubtitle( $oldid );
 859                                                 if ( !$this->showDeletedRevisionHeader() ) {
 860                                                         wfDebug( __METHOD__.": cannot view deleted revision\n" );
 861                                                         wfProfileOut( __METHOD__ );
 862                                                         return;
 863                                                 }
 864                                                 # If this "old" version is the current, then try the parser cache...
 865                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
 866                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 867                                                         if ( $this->mParserOutput ) {
 868                                                                 wfDebug( __METHOD__.": showing parser cache for current rev permalink\n" );
 869                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 870                                                                 $wgOut->setRevisionId( $this->mLatest );
 871                                                                 $this->showViewFooter();
 872                                                                 $this->viewUpdates();
 873                                                                 wfProfileOut( __METHOD__ );
 874                                                                 return;
 875                                                         }
 876                                                 }
 877                                         }
 878
 879                                         # Ensure that UI elements requiring revision ID have
 880                                         # the correct version information.
 881                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 882
 883                                         # Pages containing custom CSS or JavaScript get special treatment
 884                                         if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 885                                                 wfDebug( __METHOD__.": showing CSS/JS source\n" );
 886                                                 $this->showCssOrJsPage();
 887                                                 $outputDone = true;
 888                                         } else if( $rt = Title::newFromRedirectArray( $text ) ) {
 889                                                 wfDebug( __METHOD__.": showing redirect=no page\n" );
 890                                                 # Viewing a redirect page (e.g. with parameter redirect=no)
 891                                                 # Don't append the subtitle if this was an old revision
 892                                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 893                                                 # Parse just to get categories, displaytitle, etc.
 894                                                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
 895                                                 $wgOut->addParserOutputNoText( $this->mParserOutput );
 896                                                 $outputDone = true;
 897                                         }
 898                                         break;
 899
 900                                 case 4:
 901                                         # Run the parse, protected by a pool counter
 902                                         wfDebug( __METHOD__.": doing uncached parse\n" );
 903                                         $key = $parserCache->getKey( $this, $parserOptions );
 904                                         $poolCounter = PoolCounter::factory( 'Article::view', $key );
 905                                         $dirtyCallback = $useParserCache ? array( $this, 'tryDirtyCache' ) : false;
 906                                         $status = $poolCounter->executeProtected( array( $this, 'doViewParse' ), $dirtyCallback );
 907
 908                                         if ( !$status->isOK() ) {
 909                                                 # Connection or timeout error
 910                                                 $this->showPoolError( $status );
 911                                                 wfProfileOut( __METHOD__ );
 912                                                 return;
 913                                         } else {
 914                                                 $outputDone = true;
 915                                         }
 916                                         break;
 917
 918                                 # Should be unreachable, but just in case...
 919                                 default:
 920                                         break 2;
 921                         }
 922                 }
 923
 924                 # Now that we've filled $this->mParserOutput, we know whether
 925                 # there are any __NOINDEX__ tags on the page
 926                 $policy = $this->getRobotPolicy( 'view' );
 927                 $wgOut->setIndexPolicy( $policy['index'] );
 928                 $wgOut->setFollowPolicy( $policy['follow'] );
 929
 930                 $this->showViewFooter();
 931                 $this->viewUpdates();
 932                 wfProfileOut( __METHOD__ );
 933         }
 934
 935         /**
 936          * Show a diff page according to current request variables. For use within
 937          * Article::view() only, other callers should use the DifferenceEngine class.
 938          */
 939         public function showDiffPage() {
 940                 global $wgOut, $wgRequest, $wgUser;
 941
 942                 $diff = $wgRequest->getVal( 'diff' );
 943                 $rcid = $wgRequest->getVal( 'rcid' );
 944                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 945                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 946                 $htmldiff = $wgRequest->getBool( 'htmldiff' );
 947                 $unhide = $wgRequest->getInt('unhide') == 1;
 948                 $oldid = $this->getOldID();
 949
 950                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $htmldiff, $unhide );
 951                 // DifferenceEngine directly fetched the revision:
 952                 $this->mRevIdFetched = $de->mNewid;
 953                 $de->showDiffPage( $diffOnly );
 954
 955                 // Needed to get the page's current revision
 956                 $this->loadPageData();
 957                 if( $diff == 0 || $diff == $this->mLatest ) {
 958                         # Run view updates for current revision only
 959                         $this->viewUpdates();
 960                 }
 961         }
 962
 963         /**
 964          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 965          * Article::view() only.
 966          *
 967          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
 968          * page views.
 969          */
 970         public function showCssOrJsPage() {
 971                 global $wgOut;
 972                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
 973                 // Give hooks a chance to customise the output
 974                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 975                         // Wrap the whole lot in a <pre> and don't parse
 976                         $m = array();
 977                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 978                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 979                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 980                         $wgOut->addHTML( "\n</pre>\n" );
 981                 }
 982         }
 983
 984         /**
 985          * Get the robot policy to be used for the current action=view request.
 986          * @return String the policy that should be set
 987          * @deprecated use getRobotPolicy() instead, which returns an associative
 988          *    array
 989          */
 990         public function getRobotPolicyForView() {
 991                 wfDeprecated( __FUNC__ );
 992                 $policy = $this->getRobotPolicy( 'view' );
 993                 return $policy['index'] . ',' . $policy['follow'];
 994         }
 995
 996         /**
 997          * Get the robot policy to be used for the current view
 998          * @param $action String the action= GET parameter
 999          * @return Array the policy that should be set
1000          * TODO: actions other than 'view'
1001          */
1002         public function getRobotPolicy( $action ){
1003
1004                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1005                 global $wgDefaultRobotPolicy, $wgRequest;
1006
1007                 $ns = $this->mTitle->getNamespace();
1008                 if( $ns == NS_USER || $ns == NS_USER_TALK ) {
1009                         # Don't index user and user talk pages for blocked users (bug 11443)
1010                         if( !$this->mTitle->isSubpage() ) {
1011                                 $block = new Block();
1012                                 if( $block->load( $this->mTitle->getText() ) ) {
1013                                         return array( 'index'  => 'noindex',
1014                                                       'follow' => 'nofollow' );
1015                                 }
1016                         }
1017                 }
1018
1019                 if( $this->getID() === 0 || $this->getOldID() ) {
1020                         # Non-articles (special pages etc), and old revisions
1021                         return array( 'index'  => 'noindex',
1022                                       'follow' => 'nofollow' );
1023                 } elseif( $wgOut->isPrintable() ) {
1024                         # Discourage indexing of printable versions, but encourage following
1025                         return array( 'index'  => 'noindex',
1026                                       'follow' => 'follow' );
1027                 } elseif( $wgRequest->getInt('curid') ) {
1028                         # For ?curid=x urls, disallow indexing
1029                         return array( 'index'  => 'noindex',
1030                                       'follow' => 'follow' );
1031                 }
1032
1033                 # Otherwise, construct the policy based on the various config variables.
1034                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1035
1036                 if( isset( $wgNamespaceRobotPolicies[$ns] ) ){
1037                         # Honour customised robot policies for this namespace
1038                         $policy = array_merge( $policy,
1039                                                self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] ) );
1040                 }
1041                 if( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ){
1042                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1043                         # a final sanity check that we have really got the parser output.
1044                         $policy = array_merge( $policy,
1045                                                array( 'index' => $this->mParserOutput->getIndexPolicy() ) );
1046                 }
1047
1048                 if( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ){
1049                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1050                         $policy = array_merge( $policy,
1051                                                self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) );
1052                 }
1053
1054                 return $policy;
1055
1056         }
1057
1058         /**
1059          * Converts a String robot policy into an associative array, to allow
1060          * merging of several policies using array_merge().
1061          * @param $policy Mixed, returns empty array on null/false/'', transparent
1062          *            to already-converted arrays, converts String.
1063          * @return associative Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1064          */
1065         public static function formatRobotPolicy( $policy ){
1066                 if( is_array( $policy ) ){
1067                         return $policy;
1068                 } elseif( !$policy ){
1069                         return array();
1070                 }
1071
1072                 $policy = explode( ',', $policy );
1073                 $policy = array_map( 'trim', $policy );
1074
1075                 $arr = array();
1076                 foreach( $policy as $var ){
1077                         if( in_array( $var, array('index','noindex') ) ){
1078                                 $arr['index'] = $var;
1079                         } elseif( in_array( $var, array('follow','nofollow') ) ){
1080                                 $arr['follow'] = $var;
1081                         }
1082                 }
1083                 return $arr;
1084         }
1085
1086         /**
1087          * If this request is a redirect view, send "redirected from" subtitle to
1088          * $wgOut. Returns true if the header was needed, false if this is not a
1089          * redirect view. Handles both local and remote redirects.
1090          */
1091         public function showRedirectedFromHeader() {
1092                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1093
1094                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1095                 $sk = $wgUser->getSkin();
1096                 if( isset( $this->mRedirectedFrom ) ) {
1097                         // This is an internally redirected page view.
1098                         // We'll need a backlink to the source page for navigation.
1099                         if( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1100                                 $redir = $sk->link(
1101                                         $this->mRedirectedFrom,
1102                                         null,
1103                                         array(),
1104                                         array( 'redirect' => 'no' ),
1105                                         array( 'known', 'noclasses' )
1106                                 );
1107                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1108                                 $wgOut->setSubtitle( $s );
1109
1110                                 // Set the fragment if one was specified in the redirect
1111                                 if( strval( $this->mTitle->getFragment() ) != '' ) {
1112                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1113                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1114                                 }
1115
1116                                 // Add a <link rel="canonical"> tag
1117                                 $wgOut->addLink( array( 'rel' => 'canonical',
1118                                         'href' => $this->mTitle->getLocalURL() )
1119                                 );
1120                                 return true;
1121                         }
1122                 } elseif( $rdfrom ) {
1123                         // This is an externally redirected view, from some other wiki.
1124                         // If it was reported from a trusted site, supply a backlink.
1125                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1126                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
1127                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1128                                 $wgOut->setSubtitle( $s );
1129                                 return true;
1130                         }
1131                 }
1132                 return false;
1133         }
1134
1135         /**
1136          * Show a header specific to the namespace currently being viewed, like
1137          * [[MediaWiki:Talkpagetext]]. For Article::view().
1138          */
1139         public function showNamespaceHeader() {
1140                 global $wgOut;
1141                 if( $this->mTitle->isTalkPage() ) {
1142                         $msg = wfMsgNoTrans( 'talkpageheader' );
1143                         if ( $msg !== '-' && !wfEmptyMsg( 'talkpageheader', $msg ) ) {
1144                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1</div>", array( 'talkpageheader' ) );
1145                         }
1146                 }
1147         }
1148
1149         /**
1150          * Show the footer section of an ordinary page view
1151          */
1152         public function showViewFooter() {
1153                 global $wgOut, $wgUseTrackbacks, $wgRequest;
1154                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1155                 if( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1156                         $wgOut->addWikiMsg('anontalkpagetext');
1157                 }
1158
1159                 # If we have been passed an &rcid= parameter, we want to give the user a
1160                 # chance to mark this new article as patrolled.
1161                 $this->showPatrolFooter();
1162
1163                 # Trackbacks
1164                 if( $wgUseTrackbacks ) {
1165                         $this->addTrackbacks();
1166                 }
1167         }
1168
1169         /**
1170          * If patrol is possible, output a patrol UI box. This is called from the
1171          * footer section of ordinary page views. If patrol is not possible or not
1172          * desired, does nothing.
1173          */
1174         public function showPatrolFooter() {
1175                 global $wgOut, $wgRequest, $wgUser;
1176                 $rcid = $wgRequest->getVal( 'rcid' );
1177
1178                 if( !$rcid || !$this->mTitle->exists() || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1179                         return;
1180                 }
1181
1182                 $sk = $wgUser->getSkin();
1183
1184                 $wgOut->addHTML(
1185                         "<div class='patrollink'>" .
1186                                 wfMsgHtml(
1187                                         'markaspatrolledlink',
1188                                         $sk->link(
1189                                                 $this->mTitle,
1190                                                 wfMsgHtml( 'markaspatrolledtext' ),
1191                                                 array(),
1192                                                 array(
1193                                                         'action' => 'markpatrolled',
1194                                                         'rcid' => $rcid
1195                                                 ),
1196                                                 array( 'known', 'noclasses' )
1197                                         )
1198                                 ) .
1199                         '</div>'
1200                 );
1201         }
1202
1203         /**
1204          * Show the error text for a missing article. For articles in the MediaWiki
1205          * namespace, show the default message text. To be called from Article::view().
1206          */
1207         public function showMissingArticle() {
1208                 global $wgOut, $wgRequest, $wgUser;
1209
1210                 # Show info in user (talk) namespace. Does the user exist?
1211                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1212                         $parts = explode( '/', $this->mTitle->getText() );
1213                         $rootPart = $parts[0];
1214                         $id = User::idFromName( $rootPart );
1215                         $ip = User::isIP( $rootPart );
1216                         if ( $id == 0 && !$ip ) { # User does not exist
1217                                 $wgOut->wrapWikiMsg( '<div class="mw-userpage-userdoesnotexist error">$1</div>',
1218                                         array( 'userpage-userdoesnotexist-view', $rootPart ) );
1219                         }
1220                 }
1221                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1222                 # Show delete and move logs
1223                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1224                         array(  'lim' => 10,
1225                                 'conds' => array( "log_action != 'revision'" ),
1226                                 'showIfEmpty' => false,
1227                                 'msgKey' => array( 'moveddeleted-notice' ) )
1228                 );
1229
1230                 # Show error message
1231                 $oldid = $this->getOldID();
1232                 if( $oldid ) {
1233                         $text = wfMsgNoTrans( 'missing-article',
1234                                 $this->mTitle->getPrefixedText(),
1235                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1236                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1237                         // Use the default message text
1238                         $text = $this->getContent();
1239                 } else {
1240                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1241                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1242                         $errors = array_merge( $createErrors, $editErrors );
1243
1244                         if ( !count($errors) )
1245                                 $text = wfMsgNoTrans( 'noarticletext' );
1246                         else
1247                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1248                 }
1249                 $text = "<div class='noarticletext'>\n$text\n</div>";
1250                 if( !$this->hasViewableContent() ) {
1251                         // If there's no backing content, send a 404 Not Found
1252                         // for better machine handling of broken links.
1253                         $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
1254                 }
1255                 $wgOut->addWikiText( $text );
1256         }
1257
1258         /**
1259          * If the revision requested for view is deleted, check permissions.
1260          * Send either an error message or a warning header to $wgOut.
1261          * Returns true if the view is allowed, false if not.
1262          */
1263         public function showDeletedRevisionHeader() {
1264                 global $wgOut, $wgRequest;
1265                 if( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1266                         // Not deleted
1267                         return true;
1268                 }
1269                 // If the user is not allowed to see it...
1270                 if( !$this->mRevision->userCan(Revision::DELETED_TEXT) ) {
1271                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
1272                                 'rev-deleted-text-permission' );
1273                         return false;
1274                 // If the user needs to confirm that they want to see it...
1275                 } else if( $wgRequest->getInt('unhide') != 1 ) {
1276                         # Give explanation and add a link to view the revision...
1277                         $oldid = intval( $this->getOldID() );
1278                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1279                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1280                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1281                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
1282                                 array($msg,$link) );
1283                         return false;
1284                 // We are allowed to see...
1285                 } else {
1286                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1287                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1288                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", $msg );
1289                         return true;
1290                 }
1291         }
1292
1293         /*
1294         * Should the parser cache be used?
1295         */
1296         public function useParserCache( $oldid ) {
1297                 global $wgUser, $wgEnableParserCache;
1298
1299                 return $wgEnableParserCache
1300                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
1301                         && $this->exists()
1302                         && empty( $oldid )
1303                         && !$this->mTitle->isCssOrJsPage()
1304                         && !$this->mTitle->isCssJsSubpage();
1305         }
1306
1307         /**
1308          * Execute the uncached parse for action=view
1309          */
1310         public function doViewParse() {
1311                 global $wgOut;
1312                 $oldid = $this->getOldID();
1313                 $useParserCache = $this->useParserCache( $oldid );
1314                 $parserOptions = clone $this->getParserOptions();
1315                 # Render printable version, use printable version cache
1316                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1317                 # Don't show section-edit links on old revisions... this way lies madness.
1318                 $parserOptions->setEditSection( $this->isCurrent() );
1319                 $useParserCache = $this->useParserCache( $oldid );
1320                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1321         }
1322
1323         /**
1324          * Try to fetch an expired entry from the parser cache. If it is present,
1325          * output it and return true. If it is not present, output nothing and
1326          * return false. This is used as a callback function for
1327          * PoolCounter::executeProtected().
1328          */
1329         public function tryDirtyCache() {
1330                 global $wgOut;
1331                 $parserCache = ParserCache::singleton();
1332                 $options = $this->getParserOptions();
1333                 $options->setIsPrintable( $wgOut->isPrintable() );
1334                 $output = $parserCache->getDirty( $this, $options );
1335                 if ( $output ) {
1336                         wfDebug( __METHOD__.": sending dirty output\n" );
1337                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1338                         $wgOut->setSquidMaxage( 0 );
1339                         $this->mParserOutput = $output;
1340                         $wgOut->addParserOutput( $output );
1341                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1342                         return true;
1343                 } else {
1344                         wfDebugLog( 'dirty', "dirty missing\n" );
1345                         wfDebug( __METHOD__.": no dirty cache\n" );
1346                         return false;
1347                 }
1348         }
1349
1350         /**
1351          * Show an error page for an error from the pool counter.
1352          * @param $status Status
1353          */
1354         public function showPoolError( $status ) {
1355                 global $wgOut;
1356                 $wgOut->clearHTML(); // for release() errors
1357                 $wgOut->enableClientCache( false );
1358                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1359                 $wgOut->addWikiText(
1360                         '<div class="errorbox">' .
1361                         $status->getWikiText( false, 'view-pool-error' ) .
1362                         '</div>'
1363                 );
1364         }
1365
1366         /**
1367          * View redirect
1368          * @param $target Title object or Array of destination(s) to redirect
1369          * @param $appendSubtitle Boolean [optional]
1370          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1371          */
1372         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1373                 global $wgParser, $wgOut, $wgContLang, $wgStylePath, $wgUser;
1374                 # Display redirect
1375                 if( !is_array( $target ) ) {
1376                         $target = array( $target );
1377                 }
1378                 $imageDir = $wgContLang->getDir();
1379                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1380                 $imageUrl2 = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1381                 $alt2 = $wgContLang->isRTL() ? '&larr;' : '&rarr;'; // should -> and <- be used instead of entities?
1382
1383                 if( $appendSubtitle ) {
1384                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1385                 }
1386                 $sk = $wgUser->getSkin();
1387                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1388                 $title = array_shift( $target );
1389                 if( $forceKnown ) {
1390                         $link = $sk->link(
1391                                 $title,
1392                                 htmlspecialchars( $title->getFullText() ),
1393                                 array(),
1394                                 array(),
1395                                 array( 'known', 'noclasses' )
1396                         );
1397                 } else {
1398                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1399                 }
1400                 // automatically append redirect=no to each link, since most of them are redirect pages themselves
1401                 foreach( $target as $rt ) {
1402                         if( $forceKnown ) {
1403                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1404                                         . $sk->link(
1405                                                 $rt,
1406                                                 htmlspecialchars( $rt->getFullText() ),
1407                                                 array(),
1408                                                 array(),
1409                                                 array( 'known', 'noclasses' )
1410                                         );
1411                         } else {
1412                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1413                                         . $sk->link( $rt, htmlspecialchars( $rt->getFullText() ) );
1414                         }
1415                 }
1416                 return '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
1417                         '<span class="redirectText">'.$link.'</span>';
1418
1419         }
1420
1421         public function addTrackbacks() {
1422                 global $wgOut, $wgUser;
1423                 $dbr = wfGetDB( DB_SLAVE );
1424                 $tbs = $dbr->select( 'trackbacks',
1425                         array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
1426                         array('tb_page' => $this->getID() )
1427                 );
1428                 if( !$dbr->numRows($tbs) ) return;
1429
1430                 $tbtext = "";
1431                 while( $o = $dbr->fetchObject($tbs) ) {
1432                         $rmvtxt = "";
1433                         if( $wgUser->isAllowed( 'trackback' ) ) {
1434                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid=" .
1435                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1436                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1437                         }
1438                         $tbtext .= "\n";
1439                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
1440                                         $o->tb_title,
1441                                         $o->tb_url,
1442                                         $o->tb_ex,
1443                                         $o->tb_name,
1444                                         $rmvtxt);
1445                 }
1446                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>$1</div>\n", array( 'trackbackbox', $tbtext ) );
1447                 $this->mTitle->invalidateCache();
1448         }
1449
1450         public function deletetrackback() {
1451                 global $wgUser, $wgRequest, $wgOut;
1452                 if( !$wgUser->matchEditToken($wgRequest->getVal('token')) ) {
1453                         $wgOut->addWikiMsg( 'sessionfailure' );
1454                         return;
1455                 }
1456
1457                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1458                 if( count($permission_errors) ) {
1459                         $wgOut->showPermissionsErrorPage( $permission_errors );
1460                         return;
1461                 }
1462
1463                 $db = wfGetDB( DB_MASTER );
1464                 $db->delete( 'trackbacks', array('tb_id' => $wgRequest->getInt('tbid')) );
1465
1466                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1467                 $this->mTitle->invalidateCache();
1468         }
1469
1470         public function render() {
1471                 global $wgOut;
1472                 $wgOut->setArticleBodyOnly(true);
1473                 $this->view();
1474         }
1475
1476         /**
1477          * Handle action=purge
1478          */
1479         public function purge() {
1480                 global $wgUser, $wgRequest, $wgOut;
1481                 if( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1482                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1483                                 $this->doPurge();
1484                                 $this->view();
1485                         }
1486                 } else {
1487                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1488                         $button = wfMsgExt( 'confirm_purge_button', array('escapenoentities') );
1489                         $form = "<form method=\"post\" action=\"$action\">\n" .
1490                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1491                                         "</form>\n";
1492                         $top = wfMsgExt( 'confirm-purge-top', array('parse') );
1493                         $bottom = wfMsgExt( 'confirm-purge-bottom', array('parse') );
1494                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1495                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1496                         $wgOut->addHTML( $top . $form . $bottom );
1497                 }
1498         }
1499
1500         /**
1501          * Perform the actions of a page purging
1502          */
1503         public function doPurge() {
1504                 global $wgUseSquid;
1505                 // Invalidate the cache
1506                 $this->mTitle->invalidateCache();
1507
1508                 if( $wgUseSquid ) {
1509                         // Commit the transaction before the purge is sent
1510                         $dbw = wfGetDB( DB_MASTER );
1511                         $dbw->immediateCommit();
1512
1513                         // Send purge
1514                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1515                         $update->doUpdate();
1516                 }
1517                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1518                         global $wgMessageCache;
1519                         if( $this->getID() == 0 ) {
1520                                 $text = false;
1521                         } else {
1522                                 $text = $this->getRawText();
1523                         }
1524                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1525                 }
1526         }
1527
1528         /**
1529          * Insert a new empty page record for this article.
1530          * This *must* be followed up by creating a revision
1531          * and running $this->updateToLatest( $rev_id );
1532          * or else the record will be left in a funky state.
1533          * Best if all done inside a transaction.
1534          *
1535          * @param $dbw Database
1536          * @return int The newly created page_id key, or false if the title already existed
1537          * @private
1538          */
1539         public function insertOn( $dbw ) {
1540                 wfProfileIn( __METHOD__ );
1541
1542                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1543                 $dbw->insert( 'page', array(
1544                         'page_id'           => $page_id,
1545                         'page_namespace'    => $this->mTitle->getNamespace(),
1546                         'page_title'        => $this->mTitle->getDBkey(),
1547                         'page_counter'      => 0,
1548                         'page_restrictions' => '',
1549                         'page_is_redirect'  => 0, # Will set this shortly...
1550                         'page_is_new'       => 1,
1551                         'page_random'       => wfRandom(),
1552                         'page_touched'      => $dbw->timestamp(),
1553                         'page_latest'       => 0, # Fill this in shortly...
1554                         'page_len'          => 0, # Fill this in shortly...
1555                 ), __METHOD__, 'IGNORE' );
1556
1557                 $affected = $dbw->affectedRows();
1558                 if( $affected ) {
1559                         $newid = $dbw->insertId();
1560                         $this->mTitle->resetArticleId( $newid );
1561                 }
1562                 wfProfileOut( __METHOD__ );
1563                 return $affected ? $newid : false;
1564         }
1565
1566         /**
1567          * Update the page record to point to a newly saved revision.
1568          *
1569          * @param $dbw Database object
1570          * @param $revision Revision: For ID number, and text used to set
1571                             length and redirect status fields
1572          * @param $lastRevision Integer: if given, will not overwrite the page field
1573          *                      when different from the currently set value.
1574          *                      Giving 0 indicates the new page flag should be set
1575          *                      on.
1576          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1577          *                                                       removing rows in redirect table.
1578          * @return bool true on success, false on failure
1579          * @private
1580          */
1581         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1582                 wfProfileIn( __METHOD__ );
1583
1584                 $text = $revision->getText();
1585                 $rt = Title::newFromRedirect( $text );
1586
1587                 $conditions = array( 'page_id' => $this->getId() );
1588                 if( !is_null( $lastRevision ) ) {
1589                         # An extra check against threads stepping on each other
1590                         $conditions['page_latest'] = $lastRevision;
1591                 }
1592
1593                 $dbw->update( 'page',
1594                         array( /* SET */
1595                                 'page_latest'      => $revision->getId(),
1596                                 'page_touched'     => $dbw->timestamp(),
1597                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1598                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1599                                 'page_len'         => strlen( $text ),
1600                         ),
1601                         $conditions,
1602                         __METHOD__ );
1603
1604                 $result = $dbw->affectedRows() != 0;
1605                 if( $result ) {
1606                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1607                 }
1608
1609                 wfProfileOut( __METHOD__ );
1610                 return $result;
1611         }
1612
1613         /**
1614          * Add row to the redirect table if this is a redirect, remove otherwise.
1615          *
1616          * @param $dbw Database
1617          * @param $redirectTitle a title object pointing to the redirect target,
1618          *                                               or NULL if this is not a redirect
1619          * @param $lastRevIsRedirect If given, will optimize adding and
1620          *                                                       removing rows in redirect table.
1621          * @return bool true on success, false on failure
1622          * @private
1623          */
1624         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1625                 // Always update redirects (target link might have changed)
1626                 // Update/Insert if we don't know if the last revision was a redirect or not
1627                 // Delete if changing from redirect to non-redirect
1628                 $isRedirect = !is_null($redirectTitle);
1629                 if($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1630                         wfProfileIn( __METHOD__ );
1631                         if( $isRedirect ) {
1632                                 // This title is a redirect, Add/Update row in the redirect table
1633                                 $set = array( /* SET */
1634                                         'rd_namespace' => $redirectTitle->getNamespace(),
1635                                         'rd_title'     => $redirectTitle->getDBkey(),
1636                                         'rd_from'      => $this->getId(),
1637                                 );
1638                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1639                         } else {
1640                                 // This is not a redirect, remove row from redirect table
1641                                 $where = array( 'rd_from' => $this->getId() );
1642                                 $dbw->delete( 'redirect', $where, __METHOD__);
1643                         }
1644                         if( $this->getTitle()->getNamespace() == NS_FILE ) {
1645                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1646                         }
1647                         wfProfileOut( __METHOD__ );
1648                         return ( $dbw->affectedRows() != 0 );
1649                 }
1650                 return true;
1651         }
1652
1653         /**
1654          * If the given revision is newer than the currently set page_latest,
1655          * update the page record. Otherwise, do nothing.
1656          *
1657          * @param $dbw Database object
1658          * @param $revision Revision object
1659          */
1660         public function updateIfNewerOn( &$dbw, $revision ) {
1661                 wfProfileIn( __METHOD__ );
1662                 $row = $dbw->selectRow(
1663                         array( 'revision', 'page' ),
1664                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1665                         array(
1666                                 'page_id' => $this->getId(),
1667                                 'page_latest=rev_id' ),
1668                         __METHOD__ );
1669                 if( $row ) {
1670                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1671                                 wfProfileOut( __METHOD__ );
1672                                 return false;
1673                         }
1674                         $prev = $row->rev_id;
1675                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1676                 } else {
1677                         # No or missing previous revision; mark the page as new
1678                         $prev = 0;
1679                         $lastRevIsRedirect = null;
1680                 }
1681                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1682                 wfProfileOut( __METHOD__ );
1683                 return $ret;
1684         }
1685
1686         /**
1687          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1688          * @return string Complete article text, or null if error
1689          */
1690         public function replaceSection( $section, $text, $summary = '', $edittime = NULL ) {
1691                 wfProfileIn( __METHOD__ );
1692                 if( strval( $section ) == '' ) {
1693                         // Whole-page edit; let the whole text through
1694                 } else {
1695                         if( is_null($edittime) ) {
1696                                 $rev = Revision::newFromTitle( $this->mTitle );
1697                         } else {
1698                                 $dbw = wfGetDB( DB_MASTER );
1699                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1700                         }
1701                         if( !$rev ) {
1702                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1703                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1704                                 return null;
1705                         }
1706                         $oldtext = $rev->getText();
1707
1708                         if( $section == 'new' ) {
1709                                 # Inserting a new section
1710                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1711                                 $text = strlen( trim( $oldtext ) ) > 0
1712                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1713                                                 : "{$subject}{$text}";
1714                         } else {
1715                                 # Replacing an existing section; roll out the big guns
1716                                 global $wgParser;
1717                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1718                         }
1719                 }
1720                 wfProfileOut( __METHOD__ );
1721                 return $text;
1722         }
1723
1724         /**
1725          * This function is not deprecated until somebody fixes the core not to use
1726          * it. Nevertheless, use Article::doEdit() instead.
1727          */
1728         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1729                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1730                         ( $isminor ? EDIT_MINOR : 0 ) |
1731                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1732                         ( $bot ? EDIT_FORCE_BOT : 0 );
1733
1734                 # If this is a comment, add the summary as headline
1735                 if( $comment && $summary != "" ) {
1736                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1737                 }
1738
1739                 $this->doEdit( $text, $summary, $flags );
1740
1741                 $dbw = wfGetDB( DB_MASTER );
1742                 if($watchthis) {
1743                         if(!$this->mTitle->userIsWatching()) {
1744                                 $dbw->begin();
1745                                 $this->doWatch();
1746                                 $dbw->commit();
1747                         }
1748                 } else {
1749                         if( $this->mTitle->userIsWatching() ) {
1750                                 $dbw->begin();
1751                                 $this->doUnwatch();
1752                                 $dbw->commit();
1753                         }
1754                 }
1755                 $this->doRedirect( $this->isRedirect( $text ) );
1756         }
1757
1758         /**
1759          * @deprecated use Article::doEdit()
1760          */
1761         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1762                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1763                         ( $minor ? EDIT_MINOR : 0 ) |
1764                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1765
1766                 $status = $this->doEdit( $text, $summary, $flags );
1767                 if( !$status->isOK() ) {
1768                         return false;
1769                 }
1770
1771                 $dbw = wfGetDB( DB_MASTER );
1772                 if( $watchthis ) {
1773                         if(!$this->mTitle->userIsWatching()) {
1774                                 $dbw->begin();
1775                                 $this->doWatch();
1776                                 $dbw->commit();
1777                         }
1778                 } else {
1779                         if( $this->mTitle->userIsWatching() ) {
1780                                 $dbw->begin();
1781                                 $this->doUnwatch();
1782                                 $dbw->commit();
1783                         }
1784                 }
1785
1786                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1787                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1788
1789                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1790                 return true;
1791         }
1792
1793         /**
1794          * Article::doEdit()
1795          *
1796          * Change an existing article or create a new article. Updates RC and all necessary caches,
1797          * optionally via the deferred update array.
1798          *
1799          * $wgUser must be set before calling this function.
1800          *
1801          * @param $text String: new text
1802          * @param $summary String: edit summary
1803          * @param $flags Integer bitfield:
1804          *      EDIT_NEW
1805          *          Article is known or assumed to be non-existent, create a new one
1806          *      EDIT_UPDATE
1807          *          Article is known or assumed to be pre-existing, update it
1808          *      EDIT_MINOR
1809          *          Mark this edit minor, if the user is allowed to do so
1810          *      EDIT_SUPPRESS_RC
1811          *          Do not log the change in recentchanges
1812          *      EDIT_FORCE_BOT
1813          *          Mark the edit a "bot" edit regardless of user rights
1814          *      EDIT_DEFER_UPDATES
1815          *          Defer some of the updates until the end of index.php
1816          *      EDIT_AUTOSUMMARY
1817          *          Fill in blank summaries with generated text where possible
1818          *
1819          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1820          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1821          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1822          * edit-already-exists error will be returned. These two conditions are also possible with
1823          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1824          *
1825          * @param $baseRevId the revision ID this edit was based off, if any
1826          * @param $user Optional user object, $wgUser will be used if not passed
1827          *
1828          * @return Status object. Possible errors:
1829          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1830          *     edit-gone-missing:       In update mode, but the article didn't exist
1831          *     edit-conflict:           In update mode, the article changed unexpectedly
1832          *     edit-no-change:          Warning that the text was the same as before
1833          *     edit-already-exists:     In creation mode, but the article already exists
1834          *
1835          *  Extensions may define additional errors.
1836          *
1837          *  $return->value will contain an associative array with members as follows:
1838          *     new:                     Boolean indicating if the function attempted to create a new article
1839          *     revision:                The revision object for the inserted revision, or null
1840          *
1841          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1842          */
1843         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1844                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1845
1846                 # Low-level sanity check
1847                 if( $this->mTitle->getText() == '' ) {
1848                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1849                 }
1850
1851                 wfProfileIn( __METHOD__ );
1852
1853                 $user = is_null($user) ? $wgUser : $user;
1854                 $status = Status::newGood( array() );
1855
1856                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1857                 $this->loadPageData();
1858
1859                 if( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1860                         $aid = $this->mTitle->getArticleID();
1861                         if( $aid ) {
1862                                 $flags |= EDIT_UPDATE;
1863                         } else {
1864                                 $flags |= EDIT_NEW;
1865                         }
1866                 }
1867
1868                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1869                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1870                 {
1871                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1872                         wfProfileOut( __METHOD__ );
1873                         if( $status->isOK() ) {
1874                                 $status->fatal( 'edit-hook-aborted');
1875                         }
1876                         return $status;
1877                 }
1878
1879                 # Silently ignore EDIT_MINOR if not allowed
1880                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed('minoredit');
1881                 $bot = $flags & EDIT_FORCE_BOT;
1882
1883                 $oldtext = $this->getRawText(); // current revision
1884                 $oldsize = strlen( $oldtext );
1885
1886                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1887                 if( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1888                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1889                 }
1890
1891                 $editInfo = $this->prepareTextForEdit( $text );
1892                 $text = $editInfo->pst;
1893                 $newsize = strlen( $text );
1894
1895                 $dbw = wfGetDB( DB_MASTER );
1896                 $now = wfTimestampNow();
1897                 $this->mTimestamp=$now;
1898
1899                 if( $flags & EDIT_UPDATE ) {
1900                         # Update article, but only if changed.
1901                         $status->value['new'] = false;
1902                         # Make sure the revision is either completely inserted or not inserted at all
1903                         if( !$wgDBtransactions ) {
1904                                 $userAbort = ignore_user_abort( true );
1905                         }
1906
1907                         $revisionId = 0;
1908
1909                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1910
1911                         if( $changed ) {
1912                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1913                                   - (int)$this->isCountable( $oldtext );
1914                                 $this->mTotalAdjustment = 0;
1915
1916                                 if( !$this->mLatest ) {
1917                                         # Article gone missing
1918                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1919                                         $status->fatal( 'edit-gone-missing' );
1920                                         wfProfileOut( __METHOD__ );
1921                                         return $status;
1922                                 }
1923
1924                                 $revision = new Revision( array(
1925                                         'page'       => $this->getId(),
1926                                         'comment'    => $summary,
1927                                         'minor_edit' => $isminor,
1928                                         'text'       => $text,
1929                                         'parent_id'  => $this->mLatest,
1930                                         'user'       => $user->getId(),
1931                                         'user_text'  => $user->getName(),
1932                                         ) );
1933
1934                                 $dbw->begin();
1935                                 $revisionId = $revision->insertOn( $dbw );
1936
1937                                 # Update page
1938                                 #
1939                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1940                                 # during the course of this function. This makes sure that EditPage can detect
1941                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1942                                 # before this function is called. A previous function used a separate query, this
1943                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1944                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1945
1946                                 if( !$ok ) {
1947                                         /* Belated edit conflict! Run away!! */
1948                                         $status->fatal( 'edit-conflict' );
1949                                         # Delete the invalid revision if the DB is not transactional
1950                                         if( !$wgDBtransactions ) {
1951                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1952                                         }
1953                                         $revisionId = 0;
1954                                         $dbw->rollback();
1955                                 } else {
1956                                         global $wgUseRCPatrol;
1957                                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, $baseRevId, $user) );
1958                                         # Update recentchanges
1959                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1960                                                 # Mark as patrolled if the user can do so
1961                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan('autopatrol');
1962                                                 # Add RC row to the DB
1963                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1964                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1965                                                         $revisionId, $patrolled
1966                                                 );
1967                                                 # Log auto-patrolled edits
1968                                                 if( $patrolled ) {
1969                                                         PatrolLog::record( $rc, true );
1970                                                 }
1971                                         }
1972                                         $user->incEditCount();
1973                                         $dbw->commit();
1974                                 }
1975                         } else {
1976                                 $status->warning( 'edit-no-change' );
1977                                 $revision = null;
1978                                 // Keep the same revision ID, but do some updates on it
1979                                 $revisionId = $this->getRevIdFetched();
1980                                 // Update page_touched, this is usually implicit in the page update
1981                                 // Other cache updates are done in onArticleEdit()
1982                                 $this->mTitle->invalidateCache();
1983                         }
1984
1985                         if( !$wgDBtransactions ) {
1986                                 ignore_user_abort( $userAbort );
1987                         }
1988                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1989                         if( !$status->isOK() ) {
1990                                 wfProfileOut( __METHOD__ );
1991                                 return $status;
1992                         }
1993
1994                         # Invalidate cache of this article and all pages using this article
1995                         # as a template. Partly deferred.
1996                         Article::onArticleEdit( $this->mTitle );
1997                         # Update links tables, site stats, etc.
1998                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1999                 } else {
2000                         # Create new article
2001                         $status->value['new'] = true;
2002
2003                         # Set statistics members
2004                         # We work out if it's countable after PST to avoid counter drift
2005                         # when articles are created with {{subst:}}
2006                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2007                         $this->mTotalAdjustment = 1;
2008
2009                         $dbw->begin();
2010
2011                         # Add the page record; stake our claim on this title!
2012                         # This will return false if the article already exists
2013                         $newid = $this->insertOn( $dbw );
2014
2015                         if( $newid === false ) {
2016                                 $dbw->rollback();
2017                                 $status->fatal( 'edit-already-exists' );
2018                                 wfProfileOut( __METHOD__ );
2019                                 return $status;
2020                         }
2021
2022                         # Save the revision text...
2023                         $revision = new Revision( array(
2024                                 'page'       => $newid,
2025                                 'comment'    => $summary,
2026                                 'minor_edit' => $isminor,
2027                                 'text'       => $text,
2028                                 'user'       => $user->getId(),
2029                                 'user_text'  => $user->getName(),
2030                                 ) );
2031                         $revisionId = $revision->insertOn( $dbw );
2032
2033                         $this->mTitle->resetArticleID( $newid );
2034
2035                         # Update the page record with revision data
2036                         $this->updateRevisionOn( $dbw, $revision, 0 );
2037
2038                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $user) );
2039                         # Update recentchanges
2040                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
2041                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2042                                 # Mark as patrolled if the user can do so
2043                                 $patrolled = ($wgUseRCPatrol || $wgUseNPPatrol) && $this->mTitle->userCan('autopatrol');
2044                                 # Add RC row to the DB
2045                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2046                                         '', strlen($text), $revisionId, $patrolled );
2047                                 # Log auto-patrolled edits
2048                                 if( $patrolled ) {
2049                                         PatrolLog::record( $rc, true );
2050                                 }
2051                         }
2052                         $user->incEditCount();
2053                         $dbw->commit();
2054
2055                         # Update links, etc.
2056                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
2057
2058                         # Clear caches
2059                         Article::onArticleCreate( $this->mTitle );
2060
2061                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2062                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
2063                 }
2064
2065                 # Do updates right now unless deferral was requested
2066                 if( !( $flags & EDIT_DEFER_UPDATES ) ) {
2067                         wfDoUpdates();
2068                 }
2069
2070                 // Return the new revision (or null) to the caller
2071                 $status->value['revision'] = $revision;
2072
2073                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2074                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
2075
2076                 wfProfileOut( __METHOD__ );
2077                 return $status;
2078         }
2079
2080         /**
2081          * @deprecated wrapper for doRedirect
2082          */
2083         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
2084                 wfDeprecated( __METHOD__ );
2085                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
2086         }
2087
2088         /**
2089          * Output a redirect back to the article.
2090          * This is typically used after an edit.
2091          *
2092          * @param $noRedir Boolean: add redirect=no
2093          * @param $sectionAnchor String: section to redirect to, including "#"
2094          * @param $extraQuery String: extra query params
2095          */
2096         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2097                 global $wgOut;
2098                 if( $noRedir ) {
2099                         $query = 'redirect=no';
2100                         if( $extraQuery )
2101                                 $query .= "&$query";
2102                 } else {
2103                         $query = $extraQuery;
2104                 }
2105                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2106         }
2107
2108         /**
2109          * Mark this particular edit/page as patrolled
2110          */
2111         public function markpatrolled() {
2112                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
2113                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2114
2115                 # If we haven't been given an rc_id value, we can't do anything
2116                 $rcid = (int) $wgRequest->getVal('rcid');
2117                 $rc = RecentChange::newFromId($rcid);
2118                 if( is_null($rc) ) {
2119                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2120                         return;
2121                 }
2122
2123                 #It would be nice to see where the user had actually come from, but for now just guess
2124                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2125                 $return = SpecialPage::getTitleFor( $returnto );
2126
2127                 $dbw = wfGetDB( DB_MASTER );
2128                 $errors = $rc->doMarkPatrolled();
2129
2130                 if( in_array(array('rcpatroldisabled'), $errors) ) {
2131                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2132                         return;
2133                 }
2134
2135                 if( in_array(array('hookaborted'), $errors) ) {
2136                         // The hook itself has handled any output
2137                         return;
2138                 }
2139
2140                 if( in_array(array('markedaspatrollederror-noautopatrol'), $errors) ) {
2141                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2142                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2143                         $wgOut->returnToMain( false, $return );
2144                         return;
2145                 }
2146
2147                 if( !empty($errors) ) {
2148                         $wgOut->showPermissionsErrorPage( $errors );
2149                         return;
2150                 }
2151
2152                 # Inform the user
2153                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2154                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
2155                 $wgOut->returnToMain( false, $return );
2156         }
2157
2158         /**
2159          * User-interface handler for the "watch" action
2160          */
2161
2162         public function watch() {
2163                 global $wgUser, $wgOut;
2164                 if( $wgUser->isAnon() ) {
2165                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2166                         return;
2167                 }
2168                 if( wfReadOnly() ) {
2169                         $wgOut->readOnlyPage();
2170                         return;
2171                 }
2172                 if( $this->doWatch() ) {
2173                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
2174                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2175                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
2176                 }
2177                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2178         }
2179
2180         /**
2181          * Add this page to $wgUser's watchlist
2182          * @return bool true on successful watch operation
2183          */
2184         public function doWatch() {
2185                 global $wgUser;
2186                 if( $wgUser->isAnon() ) {
2187                         return false;
2188                 }
2189                 if( wfRunHooks('WatchArticle', array(&$wgUser, &$this)) ) {
2190                         $wgUser->addWatch( $this->mTitle );
2191                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
2192                 }
2193                 return false;
2194         }
2195
2196         /**
2197          * User interface handler for the "unwatch" action.
2198          */
2199         public function unwatch() {
2200                 global $wgUser, $wgOut;
2201                 if( $wgUser->isAnon() ) {
2202                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2203                         return;
2204                 }
2205                 if( wfReadOnly() ) {
2206                         $wgOut->readOnlyPage();
2207                         return;
2208                 }
2209                 if( $this->doUnwatch() ) {
2210                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
2211                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2212                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
2213                 }
2214                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2215         }
2216
2217         /**
2218          * Stop watching a page
2219          * @return bool true on successful unwatch
2220          */
2221         public function doUnwatch() {
2222                 global $wgUser;
2223                 if( $wgUser->isAnon() ) {
2224                         return false;
2225                 }
2226                 if( wfRunHooks('UnwatchArticle', array(&$wgUser, &$this)) ) {
2227                         $wgUser->removeWatch( $this->mTitle );
2228                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
2229                 }
2230                 return false;
2231         }
2232
2233         /**
2234          * action=protect handler
2235          */
2236         public function protect() {
2237                 $form = new ProtectionForm( $this );
2238                 $form->execute();
2239         }
2240
2241         /**
2242          * action=unprotect handler (alias)
2243          */
2244         public function unprotect() {
2245                 $this->protect();
2246         }
2247
2248         /**
2249          * Update the article's restriction field, and leave a log entry.
2250          *
2251          * @param $limit Array: set of restriction keys
2252          * @param $reason String
2253          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2254          * @param $expiry Array: per restriction type expiration
2255          * @return bool true on success
2256          */
2257         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2258                 global $wgUser, $wgRestrictionTypes, $wgContLang;
2259
2260                 $id = $this->mTitle->getArticleID();
2261                 if ( $id <= 0 ) {
2262                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
2263                         return false;
2264                 }
2265
2266                 if ( wfReadOnly() ) {
2267                         wfDebug( "updateRestrictions failed: read-only\n" );
2268                         return false;
2269                 }
2270
2271                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2272                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2273                         return false;
2274                 }
2275
2276                 if( !$cascade ) {
2277                         $cascade = false;
2278                 }
2279
2280                 // Take this opportunity to purge out expired restrictions
2281                 Title::purgeExpiredRestrictions();
2282
2283                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2284                 # we expect a single selection, but the schema allows otherwise.
2285                 $current = array();
2286                 $updated = Article::flattenRestrictions( $limit );
2287                 $changed = false;
2288                 foreach( $wgRestrictionTypes as $action ) {
2289                         if( isset( $expiry[$action] ) ) {
2290                                 # Get current restrictions on $action
2291                                 $aLimits = $this->mTitle->getRestrictions( $action );
2292                                 $current[$action] = implode( '', $aLimits );
2293                                 # Are any actual restrictions being dealt with here?
2294                                 $aRChanged = count($aLimits) || !empty($limit[$action]);
2295                                 # If something changed, we need to log it. Checking $aRChanged
2296                                 # assures that "unprotecting" a page that is not protected does
2297                                 # not log just because the expiry was "changed".
2298                                 if( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2299                                         $changed = true;
2300                                 }
2301                         }
2302                 }
2303
2304                 $current = Article::flattenRestrictions( $current );
2305
2306                 $changed = ($changed || $current != $updated );
2307                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
2308                 $protect = ( $updated != '' );
2309
2310                 # If nothing's changed, do nothing
2311                 if( $changed ) {
2312                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2313
2314                                 $dbw = wfGetDB( DB_MASTER );
2315
2316                                 # Prepare a null revision to be added to the history
2317                                 $modified = $current != '' && $protect;
2318                                 if( $protect ) {
2319                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2320                                 } else {
2321                                         $comment_type = 'unprotectedarticle';
2322                                 }
2323                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2324
2325                                 # Only restrictions with the 'protect' right can cascade...
2326                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2327                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2328                                 # The schema allows multiple restrictions
2329                                 if(!in_array('protect', $editrestriction) && !in_array('sysop', $editrestriction))
2330                                         $cascade = false;
2331                                 $cascade_description = '';
2332                                 if( $cascade ) {
2333                                         $cascade_description = ' ['.wfMsgForContent('protect-summary-cascade').']';
2334                                 }
2335
2336                                 if( $reason )
2337                                         $comment .= ": $reason";
2338
2339                                 $editComment = $comment;
2340                                 $encodedExpiry = array();
2341                                 $protect_description = '';
2342                                 foreach( $limit as $action => $restrictions  ) {
2343                                         if ( !isset($expiry[$action]) )
2344                                                 $expiry[$action] = 'infinite';
2345
2346                                         $encodedExpiry[$action] = Block::encodeExpiry($expiry[$action], $dbw );
2347                                         if( $restrictions != '' ) {
2348                                                 $protect_description .= "[$action=$restrictions] (";
2349                                                 if( $encodedExpiry[$action] != 'infinity' ) {
2350                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2351                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2352                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2353                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2354                                                 } else {
2355                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2356                                                 }
2357                                                 $protect_description .= ') ';
2358                                         }
2359                                 }
2360                                 $protect_description = trim($protect_description);
2361
2362                                 if( $protect_description && $protect )
2363                                         $editComment .= " ($protect_description)";
2364                                 if( $cascade )
2365                                         $editComment .= "$cascade_description";
2366                                 # Update restrictions table
2367                                 foreach( $limit as $action => $restrictions ) {
2368                                         if($restrictions != '' ) {
2369                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
2370                                                         array( 'pr_page' => $id,
2371                                                                 'pr_type' => $action,
2372                                                                 'pr_level' => $restrictions,
2373                                                                 'pr_cascade' => ($cascade && $action == 'edit') ? 1 : 0,
2374                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
2375                                         } else {
2376                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2377                                                         'pr_type' => $action ), __METHOD__ );
2378                                         }
2379                                 }
2380
2381                                 # Insert a null revision
2382                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2383                                 $nullRevId = $nullRevision->insertOn( $dbw );
2384
2385                                 $latest = $this->getLatest();
2386                                 # Update page record
2387                                 $dbw->update( 'page',
2388                                         array( /* SET */
2389                                                 'page_touched' => $dbw->timestamp(),
2390                                                 'page_restrictions' => '',
2391                                                 'page_latest' => $nullRevId
2392                                         ), array( /* WHERE */
2393                                                 'page_id' => $id
2394                                         ), 'Article::protect'
2395                                 );
2396
2397                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $nullRevision, $latest, $wgUser) );
2398                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2399
2400                                 # Update the protection log
2401                                 $log = new LogPage( 'protect' );
2402                                 if( $protect ) {
2403                                         $params = array($protect_description,$cascade ? 'cascade' : '');
2404                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason), $params );
2405                                 } else {
2406                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2407                                 }
2408
2409                         } # End hook
2410                 } # End "changed" check
2411
2412                 return true;
2413         }
2414
2415         /**
2416          * Take an array of page restrictions and flatten it to a string
2417          * suitable for insertion into the page_restrictions field.
2418          * @param $limit Array
2419          * @return String
2420          */
2421         protected static function flattenRestrictions( $limit ) {
2422                 if( !is_array( $limit ) ) {
2423                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2424                 }
2425                 $bits = array();
2426                 ksort( $limit );
2427                 foreach( $limit as $action => $restrictions ) {
2428                         if( $restrictions != '' ) {
2429                                 $bits[] = "$action=$restrictions";
2430                         }
2431                 }
2432                 return implode( ':', $bits );
2433         }
2434
2435         /**
2436          * Auto-generates a deletion reason
2437          * @param &$hasHistory Boolean: whether the page has a history
2438          */
2439         public function generateReason( &$hasHistory ) {
2440                 global $wgContLang;
2441                 $dbw = wfGetDB( DB_MASTER );
2442                 // Get the last revision
2443                 $rev = Revision::newFromTitle( $this->mTitle );
2444                 if( is_null( $rev ) )
2445                         return false;
2446
2447                 // Get the article's contents
2448                 $contents = $rev->getText();
2449                 $blank = false;
2450                 // If the page is blank, use the text from the previous revision,
2451                 // which can only be blank if there's a move/import/protect dummy revision involved
2452                 if( $contents == '' ) {
2453                         $prev = $rev->getPrevious();
2454                         if( $prev )     {
2455                                 $contents = $prev->getText();
2456                                 $blank = true;
2457                         }
2458                 }
2459
2460                 // Find out if there was only one contributor
2461                 // Only scan the last 20 revisions
2462                 $res = $dbw->select( 'revision', 'rev_user_text',
2463                         array( 'rev_page' => $this->getID(), $dbw->bitAnd('rev_deleted', Revision::DELETED_USER) . ' = 0' ),
2464                         __METHOD__,
2465                         array( 'LIMIT' => 20 )
2466                 );
2467                 if( $res === false )
2468                         // This page has no revisions, which is very weird
2469                         return false;
2470
2471                 $hasHistory = ( $res->numRows() > 1 );
2472                 $row = $dbw->fetchObject( $res );
2473                 $onlyAuthor = $row->rev_user_text;
2474                 // Try to find a second contributor
2475                 foreach( $res as $row ) {
2476                         if( $row->rev_user_text != $onlyAuthor ) {
2477                                 $onlyAuthor = false;
2478                                 break;
2479                         }
2480                 }
2481                 $dbw->freeResult( $res );
2482
2483                 // Generate the summary with a '$1' placeholder
2484                 if( $blank ) {
2485                         // The current revision is blank and the one before is also
2486                         // blank. It's just not our lucky day
2487                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2488                 } else {
2489                         if( $onlyAuthor )
2490                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2491                         else
2492                                 $reason = wfMsgForContent( 'excontent', '$1' );
2493                 }
2494
2495                 if( $reason == '-' ) {
2496                         // Allow these UI messages to be blanked out cleanly
2497                         return '';
2498                 }
2499
2500                 // Replace newlines with spaces to prevent uglyness
2501                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2502                 // Calculate the maximum amount of chars to get
2503                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2504                 $maxLength = 255 - (strlen( $reason ) - 2) - 3;
2505                 $contents = $wgContLang->truncate( $contents, $maxLength );
2506                 // Remove possible unfinished links
2507                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2508                 // Now replace the '$1' placeholder
2509                 $reason = str_replace( '$1', $contents, $reason );
2510                 return $reason;
2511         }
2512
2513
2514         /*
2515          * UI entry point for page deletion
2516          */
2517         public function delete() {
2518                 global $wgUser, $wgOut, $wgRequest;
2519
2520                 $confirm = $wgRequest->wasPosted() &&
2521                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2522
2523                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2524                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2525
2526                 $reason = $this->DeleteReasonList;
2527
2528                 if( $reason != 'other' && $this->DeleteReason != '' ) {
2529                         // Entry from drop down menu + additional comment
2530                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2531                 } elseif( $reason == 'other' ) {
2532                         $reason = $this->DeleteReason;
2533                 }
2534                 # Flag to hide all contents of the archived revisions
2535                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2536
2537                 # This code desperately needs to be totally rewritten
2538
2539                 # Read-only check...
2540                 if( wfReadOnly() ) {
2541                         $wgOut->readOnlyPage();
2542                         return;
2543                 }
2544
2545                 # Check permissions
2546                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2547
2548                 if( count( $permission_errors ) > 0 ) {
2549                         $wgOut->showPermissionsErrorPage( $permission_errors );
2550                         return;
2551                 }
2552
2553                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2554
2555                 # Better double-check that it hasn't been deleted yet!
2556                 $dbw = wfGetDB( DB_MASTER );
2557                 $conds = $this->mTitle->pageCond();
2558                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2559                 if( $latest === false ) {
2560                         $wgOut->showFatalError(
2561                                 Html::rawElement(
2562                                         'div',
2563                                         array( 'class' => 'error mw-error-cannotdelete' ),
2564                                         wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2565                                 )
2566                         );
2567                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2568                         LogEventsList::showLogExtract(
2569                                 $wgOut,
2570                                 'delete',
2571                                 $this->mTitle->getPrefixedText()
2572                         );
2573                         return;
2574                 }
2575
2576                 # Hack for big sites
2577                 $bigHistory = $this->isBigDeletion();
2578                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2579                         global $wgLang, $wgDeleteRevisionsLimit;
2580                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2581                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2582                         return;
2583                 }
2584
2585                 if( $confirm ) {
2586                         $this->doDelete( $reason, $suppress );
2587                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2588                                 $this->doWatch();
2589                         } elseif( $this->mTitle->userIsWatching() ) {
2590                                 $this->doUnwatch();
2591                         }
2592                         return;
2593                 }
2594
2595                 // Generate deletion reason
2596                 $hasHistory = false;
2597                 if( !$reason ) $reason = $this->generateReason($hasHistory);
2598
2599                 // If the page has a history, insert a warning
2600                 if( $hasHistory && !$confirm ) {
2601                         $skin = $wgUser->getSkin();
2602                         $revisions = $this->estimateRevisionCount();
2603                         $wgOut->addHTML( '<strong>' . wfMsgExt( 'historywarning', array( 'parseinline' ), $revisions ) . ' ' . $skin->historyLink() . '</strong>' );
2604                         if( $bigHistory ) {
2605                                 global $wgLang, $wgDeleteRevisionsLimit;
2606                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2607                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2608                         }
2609                 }
2610
2611                 return $this->confirmDelete( $reason );
2612         }
2613
2614         /**
2615          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2616          */
2617         public function isBigDeletion() {
2618                 global $wgDeleteRevisionsLimit;
2619                 if( $wgDeleteRevisionsLimit ) {
2620                         $revCount = $this->estimateRevisionCount();
2621                         return $revCount > $wgDeleteRevisionsLimit;
2622                 }
2623                 return false;
2624         }
2625
2626         /**
2627          * @return int approximate revision count
2628          */
2629         public function estimateRevisionCount() {
2630                 $dbr = wfGetDB( DB_SLAVE );
2631                 // For an exact count...
2632                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2633                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2634                 return $dbr->estimateRowCount( 'revision', '*',
2635                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2636         }
2637
2638         /**
2639          * Get the last N authors
2640          * @param $num Integer: number of revisions to get
2641          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2642          * @return array Array of authors, duplicates not removed
2643          */
2644         public function getLastNAuthors( $num, $revLatest = 0 ) {
2645                 wfProfileIn( __METHOD__ );
2646                 // First try the slave
2647                 // If that doesn't have the latest revision, try the master
2648                 $continue = 2;
2649                 $db = wfGetDB( DB_SLAVE );
2650                 do {
2651                         $res = $db->select( array( 'page', 'revision' ),
2652                                 array( 'rev_id', 'rev_user_text' ),
2653                                 array(
2654                                         'page_namespace' => $this->mTitle->getNamespace(),
2655                                         'page_title' => $this->mTitle->getDBkey(),
2656                                         'rev_page = page_id'
2657                                 ), __METHOD__, $this->getSelectOptions( array(
2658                                         'ORDER BY' => 'rev_timestamp DESC',
2659                                         'LIMIT' => $num
2660                                 ) )
2661                         );
2662                         if( !$res ) {
2663                                 wfProfileOut( __METHOD__ );
2664                                 return array();
2665                         }
2666                         $row = $db->fetchObject( $res );
2667                         if( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2668                                 $db = wfGetDB( DB_MASTER );
2669                                 $continue--;
2670                         } else {
2671                                 $continue = 0;
2672                         }
2673                 } while ( $continue );
2674
2675                 $authors = array( $row->rev_user_text );
2676                 while ( $row = $db->fetchObject( $res ) ) {
2677                         $authors[] = $row->rev_user_text;
2678                 }
2679                 wfProfileOut( __METHOD__ );
2680                 return $authors;
2681         }
2682
2683         /**
2684          * Output deletion confirmation dialog
2685          * @param $reason String: prefilled reason
2686          */
2687         public function confirmDelete( $reason ) {
2688                 global $wgOut, $wgUser;
2689
2690                 wfDebug( "Article::confirmDelete\n" );
2691
2692                 $deleteBackLink = $wgUser->getSkin()->link(
2693                         $this->mTitle,
2694                         null,
2695                         array(),
2696                         array(),
2697                         array( 'known', 'noclasses' )
2698                 );
2699                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
2700                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2701                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2702
2703                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
2704
2705                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
2706                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2707                                         <td></td>
2708                                         <td class='mw-input'><strong>" .
2709                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2710                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2711                                         "</strong></td>
2712                                 </tr>";
2713                 } else {
2714                         $suppress = '';
2715                 }
2716                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2717
2718                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2719                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2720                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2721                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2722                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2723                         "<tr id=\"wpDeleteReasonListRow\">
2724                                 <td class='mw-label'>" .
2725                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2726                                 "</td>
2727                                 <td class='mw-input'>" .
2728                                         Xml::listDropDown( 'wpDeleteReasonList',
2729                                                 wfMsgForContent( 'deletereason-dropdown' ),
2730                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2731                                 "</td>
2732                         </tr>
2733                         <tr id=\"wpDeleteReasonRow\">
2734                                 <td class='mw-label'>" .
2735                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2736                                 "</td>
2737                                 <td class='mw-input'>" .
2738                                 Html::input( 'wpReason', $reason, 'text', array(
2739                                         'size' => '60',
2740                                         'maxlength' => '255',
2741                                         'tabindex' => '2',
2742                                         'id' => 'wpReason',
2743                                         'autofocus'
2744                                 ) ) .
2745                                 "</td>
2746                         </tr>
2747                         <tr>
2748                                 <td></td>
2749                                 <td class='mw-input'>" .
2750                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2751                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2752                                 "</td>
2753                         </tr>
2754                         $suppress
2755                         <tr>
2756                                 <td></td>
2757                                 <td class='mw-submit'>" .
2758                                         Xml::submitButton( wfMsg( 'deletepage' ),
2759                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2760                                 "</td>
2761                         </tr>" .
2762                         Xml::closeElement( 'table' ) .
2763                         Xml::closeElement( 'fieldset' ) .
2764                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2765                         Xml::closeElement( 'form' );
2766
2767                         if( $wgUser->isAllowed( 'editinterface' ) ) {
2768                                 $skin = $wgUser->getSkin();
2769                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
2770                                 $link = $skin->link(
2771                                         $title,
2772                                         wfMsgHtml( 'delete-edit-reasonlist' ),
2773                                         array(),
2774                                         array( 'action' => 'edit' )
2775                                 );
2776                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2777                         }
2778
2779                 $wgOut->addHTML( $form );
2780                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2781                 LogEventsList::showLogExtract(
2782                         $wgOut,
2783                         'delete',
2784                         $this->mTitle->getPrefixedText()
2785                 );
2786         }
2787
2788         /**
2789          * Perform a deletion and output success or failure messages
2790          */
2791         public function doDelete( $reason, $suppress = false ) {
2792                 global $wgOut, $wgUser;
2793                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2794
2795                 $error = '';
2796                 if( wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason, &$error)) ) {
2797                         if( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2798                                 $deleted = $this->mTitle->getPrefixedText();
2799
2800                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2801                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2802
2803                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2804
2805                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2806                                 $wgOut->returnToMain( false );
2807                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason, $id));
2808                         }
2809                 } else {
2810                         if( $error == '' ) {
2811                                 $wgOut->showFatalError(
2812                                         Html::rawElement(
2813                                                 'div',
2814                                                 array( 'class' => 'error mw-error-cannotdelete' ),
2815                                                 wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2816                                         )
2817                                 );
2818                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2819                                 LogEventsList::showLogExtract(
2820                                         $wgOut,
2821                                         'delete',
2822                                         $this->mTitle->getPrefixedText()
2823                                 );
2824                         } else {
2825                                 $wgOut->showFatalError( $error );
2826                         }
2827                 }
2828         }
2829
2830         /**
2831          * Back-end article deletion
2832          * Deletes the article with database consistency, writes logs, purges caches
2833          * Returns success
2834          */
2835         public function doDeleteArticle( $reason, $suppress = false, $id = 0 ) {
2836                 global $wgUseSquid, $wgDeferredUpdateList;
2837                 global $wgUseTrackbacks;
2838
2839                 wfDebug( __METHOD__."\n" );
2840
2841                 $dbw = wfGetDB( DB_MASTER );
2842                 $ns = $this->mTitle->getNamespace();
2843                 $t = $this->mTitle->getDBkey();
2844                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2845
2846                 if( $t == '' || $id == 0 ) {
2847                         return false;
2848                 }
2849
2850                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getRawText() ), -1 );
2851                 array_push( $wgDeferredUpdateList, $u );
2852
2853                 // Bitfields to further suppress the content
2854                 if( $suppress ) {
2855                         $bitfield = 0;
2856                         // This should be 15...
2857                         $bitfield |= Revision::DELETED_TEXT;
2858                         $bitfield |= Revision::DELETED_COMMENT;
2859                         $bitfield |= Revision::DELETED_USER;
2860                         $bitfield |= Revision::DELETED_RESTRICTED;
2861                 } else {
2862                         $bitfield = 'rev_deleted';
2863                 }
2864
2865                 $dbw->begin();
2866                 // For now, shunt the revision data into the archive table.
2867                 // Text is *not* removed from the text table; bulk storage
2868                 // is left intact to avoid breaking block-compression or
2869                 // immutable storage schemes.
2870                 //
2871                 // For backwards compatibility, note that some older archive
2872                 // table entries will have ar_text and ar_flags fields still.
2873                 //
2874                 // In the future, we may keep revisions and mark them with
2875                 // the rev_deleted field, which is reserved for this purpose.
2876                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2877                         array(
2878                                 'ar_namespace'  => 'page_namespace',
2879                                 'ar_title'      => 'page_title',
2880                                 'ar_comment'    => 'rev_comment',
2881                                 'ar_user'       => 'rev_user',
2882                                 'ar_user_text'  => 'rev_user_text',
2883                                 'ar_timestamp'  => 'rev_timestamp',
2884                                 'ar_minor_edit' => 'rev_minor_edit',
2885                                 'ar_rev_id'     => 'rev_id',
2886                                 'ar_text_id'    => 'rev_text_id',
2887                                 'ar_text'       => '\'\'', // Be explicit to appease
2888                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2889                                 'ar_len'        => 'rev_len',
2890                                 'ar_page_id'    => 'page_id',
2891                                 'ar_deleted'    => $bitfield
2892                         ), array(
2893                                 'page_id' => $id,
2894                                 'page_id = rev_page'
2895                         ), __METHOD__
2896                 );
2897
2898                 # Delete restrictions for it
2899                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2900
2901                 # Now that it's safely backed up, delete it
2902                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2903                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2904                 if( !$ok ) {
2905                         $dbw->rollback();
2906                         return false;
2907                 }
2908
2909                 # Fix category table counts
2910                 $cats = array();
2911                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2912                 foreach( $res as $row ) {
2913                         $cats []= $row->cl_to;
2914                 }
2915                 $this->updateCategoryCounts( array(), $cats );
2916
2917                 # If using cascading deletes, we can skip some explicit deletes
2918                 if( !$dbw->cascadingDeletes() ) {
2919                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2920
2921                         if($wgUseTrackbacks)
2922                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2923
2924                         # Delete outgoing links
2925                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2926                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2927                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2928                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2929                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2930                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2931                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2932                 }
2933
2934                 # If using cleanup triggers, we can skip some manual deletes
2935                 if( !$dbw->cleanupTriggers() ) {
2936                         # Clean up recentchanges entries...
2937                         $dbw->delete( 'recentchanges',
2938                                 array( 'rc_type != '.RC_LOG,
2939                                         'rc_namespace' => $this->mTitle->getNamespace(),
2940                                         'rc_title' => $this->mTitle->getDBkey() ),
2941                                 __METHOD__ );
2942                         $dbw->delete( 'recentchanges',
2943                                 array( 'rc_type != '.RC_LOG, 'rc_cur_id' => $id ),
2944                                 __METHOD__ );
2945                 }
2946
2947                 # Clear caches
2948                 Article::onArticleDelete( $this->mTitle );
2949
2950                 # Clear the cached article id so the interface doesn't act like we exist
2951                 $this->mTitle->resetArticleID( 0 );
2952
2953                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2954                 $logtype = $suppress ? 'suppress' : 'delete';
2955                 $log = new LogPage( $logtype );
2956
2957                 # Make sure logging got through
2958                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2959
2960                 $dbw->commit();
2961
2962                 return true;
2963         }
2964
2965         /**
2966          * Roll back the most recent consecutive set of edits to a page
2967          * from the same user; fails if there are no eligible edits to
2968          * roll back to, e.g. user is the sole contributor. This function
2969          * performs permissions checks on $wgUser, then calls commitRollback()
2970          * to do the dirty work
2971          *
2972          * @param $fromP String: Name of the user whose edits to rollback.
2973          * @param $summary String: Custom summary. Set to default summary if empty.
2974          * @param $token String: Rollback token.
2975          * @param $bot Boolean: If true, mark all reverted edits as bot.
2976          *
2977          * @param $resultDetails Array: contains result-specific array of additional values
2978          *    'alreadyrolled' : 'current' (rev)
2979          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2980          *
2981          * @return array of errors, each error formatted as
2982          *   array(messagekey, param1, param2, ...).
2983          * On success, the array is empty.  This array can also be passed to
2984          * OutputPage::showPermissionsErrorPage().
2985          */
2986         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2987                 global $wgUser;
2988                 $resultDetails = null;
2989
2990                 # Check permissions
2991                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
2992                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
2993                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2994
2995                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2996                         $errors[] = array( 'sessionfailure' );
2997
2998                 if( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
2999                         $errors[] = array( 'actionthrottledtext' );
3000                 }
3001                 # If there were errors, bail out now
3002                 if( !empty( $errors ) )
3003                         return $errors;
3004
3005                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
3006         }
3007
3008         /**
3009          * Backend implementation of doRollback(), please refer there for parameter
3010          * and return value documentation
3011          *
3012          * NOTE: This function does NOT check ANY permissions, it just commits the
3013          * rollback to the DB Therefore, you should only call this function direct-
3014          * ly if you want to use custom permissions checks. If you don't, use
3015          * doRollback() instead.
3016          */
3017         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
3018                 global $wgUseRCPatrol, $wgUser, $wgLang;
3019                 $dbw = wfGetDB( DB_MASTER );
3020
3021                 if( wfReadOnly() ) {
3022                         return array( array( 'readonlytext' ) );
3023                 }
3024
3025                 # Get the last editor
3026                 $current = Revision::newFromTitle( $this->mTitle );
3027                 if( is_null( $current ) ) {
3028                         # Something wrong... no page?
3029                         return array(array('notanarticle'));
3030                 }
3031
3032                 $from = str_replace( '_', ' ', $fromP );
3033                 # User name given should match up with the top revision.
3034                 # If the user was deleted then $from should be empty.
3035                 if( $from != $current->getUserText() ) {
3036                         $resultDetails = array( 'current' => $current );
3037                         return array(array('alreadyrolled',
3038                                 htmlspecialchars($this->mTitle->getPrefixedText()),
3039                                 htmlspecialchars($fromP),
3040                                 htmlspecialchars($current->getUserText())
3041                         ));
3042                 }
3043
3044                 # Get the last edit not by this guy...
3045                 # Note: these may not be public values
3046                 $user = intval( $current->getRawUser() );
3047                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3048                 $s = $dbw->selectRow( 'revision',
3049                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3050                         array(  'rev_page' => $current->getPage(),
3051                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3052                         ), __METHOD__,
3053                         array(  'USE INDEX' => 'page_timestamp',
3054                                 'ORDER BY'  => 'rev_timestamp DESC' )
3055                         );
3056                 if( $s === false ) {
3057                         # No one else ever edited this page
3058                         return array(array('cantrollback'));
3059                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
3060                         # Only admins can see this text
3061                         return array(array('notvisiblerev'));
3062                 }
3063
3064                 $set = array();
3065                 if( $bot && $wgUser->isAllowed('markbotedits') ) {
3066                         # Mark all reverted edits as bot
3067                         $set['rc_bot'] = 1;
3068                 }
3069                 if( $wgUseRCPatrol ) {
3070                         # Mark all reverted edits as patrolled
3071                         $set['rc_patrolled'] = 1;
3072                 }
3073
3074                 if( count($set) ) {
3075                         $dbw->update( 'recentchanges', $set,
3076                                 array( /* WHERE */
3077                                         'rc_cur_id' => $current->getPage(),
3078                                         'rc_user_text' => $current->getUserText(),
3079                                         "rc_timestamp > '{$s->rev_timestamp}'",
3080                                 ), __METHOD__
3081                         );
3082                 }
3083
3084                 # Generate the edit summary if necessary
3085                 $target = Revision::newFromId( $s->rev_id );
3086                 if( empty( $summary ) ) {
3087                         if( $from == '' ) { // no public user name
3088                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3089                         } else {
3090                                 $summary = wfMsgForContent( 'revertpage' );
3091                         }
3092                 }
3093
3094                 # Allow the custom summary to use the same args as the default message
3095                 $args = array(
3096                         $target->getUserText(), $from, $s->rev_id,
3097                         $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
3098                         $current->getId(), $wgLang->timeanddate($current->getTimestamp())
3099                 );
3100                 $summary = wfMsgReplaceArgs( $summary, $args );
3101
3102                 # Save
3103                 $flags = EDIT_UPDATE;
3104
3105                 if( $wgUser->isAllowed('minoredit') )
3106                         $flags |= EDIT_MINOR;
3107
3108                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
3109                         $flags |= EDIT_FORCE_BOT;
3110                 # Actually store the edit
3111                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3112                 if( !empty( $status->value['revision'] ) ) {
3113                         $revId = $status->value['revision']->getId();
3114                 } else {
3115                         $revId = false;
3116                 }
3117
3118                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3119
3120                 $resultDetails = array(
3121                         'summary' => $summary,
3122                         'current' => $current,
3123                         'target'  => $target,
3124                         'newid'   => $revId
3125                 );
3126                 return array();
3127         }
3128
3129         /**
3130          * User interface for rollback operations
3131          */
3132         public function rollback() {
3133                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
3134                 $details = null;
3135
3136                 $result = $this->doRollback(
3137                         $wgRequest->getVal( 'from' ),
3138                         $wgRequest->getText( 'summary' ),
3139                         $wgRequest->getVal( 'token' ),
3140                         $wgRequest->getBool( 'bot' ),
3141                         $details
3142                 );
3143
3144                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
3145                         $wgOut->rateLimited();
3146                         return;
3147                 }
3148                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3149                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3150                         $errArray = $result[0];
3151                         $errMsg = array_shift( $errArray );
3152                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3153                         if( isset( $details['current'] ) ){
3154                                 $current = $details['current'];
3155                                 if( $current->getComment() != '' ) {
3156                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3157                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3158                                 }
3159                         }
3160                         return;
3161                 }
3162                 # Display permissions errors before read-only message -- there's no
3163                 # point in misleading the user into thinking the inability to rollback
3164                 # is only temporary.
3165                 if( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3166                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
3167                         # move any 'readonlytext' error manually.
3168                         $out = array();
3169                         foreach( $result as $error ) {
3170                                 if( $error != array( 'readonlytext' ) ) {
3171                                         $out []= $error;
3172                                 }
3173                         }
3174                         $wgOut->showPermissionsErrorPage( $out );
3175                         return;
3176                 }
3177                 if( $result == array( array( 'readonlytext' ) ) ) {
3178                         $wgOut->readOnlyPage();
3179                         return;
3180                 }
3181
3182                 $current = $details['current'];
3183                 $target = $details['target'];
3184                 $newId = $details['newid'];
3185                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3186                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3187                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
3188                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
3189                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
3190                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
3191                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3192                 $wgOut->returnToMain( false, $this->mTitle );
3193
3194                 if( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3195                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3196                         $de->showDiff( '', '' );
3197                 }
3198         }
3199
3200
3201         /**
3202          * Do standard deferred updates after page view
3203          */
3204         public function viewUpdates() {
3205                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3206                 if ( wfReadOnly() ) {
3207                         return;
3208                 }
3209                 # Don't update page view counters on views from bot users (bug 14044)
3210                 if( !$wgDisableCounters && !$wgUser->isAllowed('bot') && $this->getID() ) {
3211                         Article::incViewCount( $this->getID() );
3212                         $u = new SiteStatsUpdate( 1, 0, 0 );
3213                         array_push( $wgDeferredUpdateList, $u );
3214                 }
3215                 # Update newtalk / watchlist notification status
3216                 $wgUser->clearNotification( $this->mTitle );
3217         }
3218
3219         /**
3220          * Prepare text which is about to be saved.
3221          * Returns a stdclass with source, pst and output members
3222          */
3223         public function prepareTextForEdit( $text, $revid=null ) {
3224                 if( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
3225                         // Already prepared
3226                         return $this->mPreparedEdit;
3227                 }
3228                 global $wgParser;
3229                 $edit = (object)array();
3230                 $edit->revid = $revid;
3231                 $edit->newText = $text;
3232                 $edit->pst = $this->preSaveTransform( $text );
3233                 $options = $this->getParserOptions();
3234                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
3235                 $edit->oldText = $this->getContent();
3236                 $this->mPreparedEdit = $edit;
3237                 return $edit;
3238         }
3239
3240         /**
3241          * Do standard deferred updates after page edit.
3242          * Update links tables, site stats, search index and message cache.
3243          * Purges pages that include this page if the text was changed here.
3244          * Every 100th edit, prune the recent changes table.
3245          *
3246          * @private
3247          * @param $text New text of the article
3248          * @param $summary Edit summary
3249          * @param $minoredit Minor edit
3250          * @param $timestamp_of_pagechange Timestamp associated with the page change
3251          * @param $newid rev_id value of the new revision
3252          * @param $changed Whether or not the content actually changed
3253          */
3254         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
3255                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
3256
3257                 wfProfileIn( __METHOD__ );
3258
3259                 # Parse the text
3260                 # Be careful not to double-PST: $text is usually already PST-ed once
3261                 if( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3262                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3263                         $editInfo = $this->prepareTextForEdit( $text, $newid );
3264                 } else {
3265                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3266                         $editInfo = $this->mPreparedEdit;
3267                 }
3268
3269                 # Save it to the parser cache
3270                 if( $wgEnableParserCache ) {
3271                         $popts = $this->getParserOptions();
3272                         $parserCache = ParserCache::singleton();
3273                         $parserCache->save( $editInfo->output, $this, $popts );
3274                 }
3275
3276                 # Update the links tables
3277                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3278                 $u->doUpdate();
3279
3280                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3281
3282                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3283                         if( 0 == mt_rand( 0, 99 ) ) {
3284                                 // Flush old entries from the `recentchanges` table; we do this on
3285                                 // random requests so as to avoid an increase in writes for no good reason
3286                                 global $wgRCMaxAge;
3287                                 $dbw = wfGetDB( DB_MASTER );
3288                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3289                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3290                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3291                                 $dbw->query( $sql );
3292                         }
3293                 }
3294
3295                 $id = $this->getID();
3296                 $title = $this->mTitle->getPrefixedDBkey();
3297                 $shortTitle = $this->mTitle->getDBkey();
3298
3299                 if( 0 == $id ) {
3300                         wfProfileOut( __METHOD__ );
3301                         return;
3302                 }
3303
3304                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3305                 array_push( $wgDeferredUpdateList, $u );
3306                 $u = new SearchUpdate( $id, $title, $text );
3307                 array_push( $wgDeferredUpdateList, $u );
3308
3309                 # If this is another user's talk page, update newtalk
3310                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3311                 # load of user talk pages and piss people off, nor if it's a minor edit
3312                 # by a properly-flagged bot.
3313                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3314                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
3315                         if( wfRunHooks('ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3316                                 $other = User::newFromName( $shortTitle, false );
3317                                 if( !$other ) {
3318                                         wfDebug( __METHOD__.": invalid username\n" );
3319                                 } elseif( User::isIP( $shortTitle ) ) {
3320                                         // An anonymous user
3321                                         $other->setNewtalk( true );
3322                                 } elseif( $other->isLoggedIn() ) {
3323                                         $other->setNewtalk( true );
3324                                 } else {
3325                                         wfDebug( __METHOD__. ": don't need to notify a nonexistent user\n" );
3326                                 }
3327                         }
3328                 }
3329
3330                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3331                         $wgMessageCache->replace( $shortTitle, $text );
3332                 }
3333
3334                 wfProfileOut( __METHOD__ );
3335         }
3336
3337         /**
3338          * Perform article updates on a special page creation.
3339          *
3340          * @param $rev Revision object
3341          *
3342          * @todo This is a shitty interface function. Kill it and replace the
3343          * other shitty functions like editUpdates and such so it's not needed
3344          * anymore.
3345          */
3346         public function createUpdates( $rev ) {
3347                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3348                 $this->mTotalAdjustment = 1;
3349                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3350                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3351         }
3352
3353         /**
3354          * Generate the navigation links when browsing through an article revisions
3355          * It shows the information as:
3356          *   Revision as of \<date\>; view current revision
3357          *   \<- Previous version | Next Version -\>
3358          *
3359          * @param $oldid String: revision ID of this article revision
3360          */
3361         public function setOldSubtitle( $oldid = 0 ) {
3362                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3363
3364                 if( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3365                         return;
3366                 }
3367
3368                 $revision = Revision::newFromId( $oldid );
3369
3370                 $current = ( $oldid == $this->mLatest );
3371                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3372                 $tddate = $wgLang->date( $this->mTimestamp, true );
3373                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3374                 $sk = $wgUser->getSkin();
3375                 $lnk = $current
3376                         ? wfMsgHtml( 'currentrevisionlink' )
3377                         : $sk->link(
3378                                 $this->mTitle,
3379                                 wfMsgHtml( 'currentrevisionlink' ),
3380                                 array(),
3381                                 array(),
3382                                 array( 'known', 'noclasses' )
3383                         );
3384                 $curdiff = $current
3385                         ? wfMsgHtml( 'diff' )
3386                         : $sk->link(
3387                                 $this->mTitle,
3388                                 wfMsgHtml( 'diff' ),
3389                                 array(),
3390                                 array(
3391                                         'diff' => 'cur',
3392                                         'oldid' => $oldid
3393                                 ),
3394                                 array( 'known', 'noclasses' )
3395                         );
3396                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3397                 $prevlink = $prev
3398                         ? $sk->link(
3399                                 $this->mTitle,
3400                                 wfMsgHtml( 'previousrevision' ),
3401                                 array(),
3402                                 array(
3403                                         'direction' => 'prev',
3404                                         'oldid' => $oldid
3405                                 ),
3406                                 array( 'known', 'noclasses' )
3407                         )
3408                         : wfMsgHtml( 'previousrevision' );
3409                 $prevdiff = $prev
3410                         ? $sk->link(
3411                                 $this->mTitle,
3412                                 wfMsgHtml( 'diff' ),
3413                                 array(),
3414                                 array(
3415                                         'diff' => 'prev',
3416                                         'oldid' => $oldid
3417                                 ),
3418                                 array( 'known', 'noclasses' )
3419                         )
3420                         : wfMsgHtml( 'diff' );
3421                 $nextlink = $current
3422                         ? wfMsgHtml( 'nextrevision' )
3423                         : $sk->link(
3424                                 $this->mTitle,
3425                                 wfMsgHtml( 'nextrevision' ),
3426                                 array(),
3427                                 array(
3428                                         'direction' => 'next',
3429                                         'oldid' => $oldid
3430                                 ),
3431                                 array( 'known', 'noclasses' )
3432                         );
3433                 $nextdiff = $current
3434                         ? wfMsgHtml( 'diff' )
3435                         : $sk->link(
3436                                 $this->mTitle,
3437                                 wfMsgHtml( 'diff' ),
3438                                 array(),
3439                                 array(
3440                                         'diff' => 'next',
3441                                         'oldid' => $oldid
3442                                 ),
3443                                 array( 'known', 'noclasses' )
3444                         );
3445
3446                 $cdel='';
3447                 // Don't show useless link to people who cannot hide revisions
3448                 if( $wgUser->isAllowed('deleterevision') || ($revision->getVisibility() && $wgUser->isAllowed('deletedhistory')) ) {
3449                         if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3450                         // If revision was hidden from sysops
3451                                 $cdel = wfMsgHtml( 'rev-delundel' );
3452                         } else {
3453                                 $cdel = $sk->link(
3454                                         SpecialPage::getTitleFor( 'Revisiondelete' ),
3455                                         wfMsgHtml('rev-delundel'),
3456                                         array(),
3457                                         array(
3458                                                 'type' => 'revision',
3459                                                 'target' => urlencode( $this->mTitle->getPrefixedDbkey() ),
3460                                                 'ids' => urlencode( $oldid )
3461                                         ),
3462                                         array( 'known', 'noclasses' )
3463                                 );
3464                                 // Bolden oversighted content
3465                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
3466                                         $cdel = "<strong>$cdel</strong>";
3467                         }
3468                         $cdel = "(<small>$cdel</small>) ";
3469                 }
3470                 $unhide = $wgRequest->getInt('unhide') == 1 && $wgUser->matchEditToken( $wgRequest->getVal('token'), $oldid );
3471                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3472                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3473
3474                 $m = wfMsg( 'revision-info-current' );
3475                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3476                         ? 'revision-info-current'
3477                         : 'revision-info';
3478
3479                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3480                         wfMsgExt(
3481                                 $infomsg,
3482                                 array( 'parseinline', 'replaceafter' ),
3483                                 $td,
3484                                 $userlinks,
3485                                 $revision->getID(),
3486                                 $tddate,
3487                                 $tdtime,
3488                                 $revision->getUser()
3489                         ) .
3490                         "</div>\n" .
3491                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3492                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3493                 $wgOut->setSubtitle( $r );
3494         }
3495
3496         /**
3497          * This function is called right before saving the wikitext,
3498          * so we can do things like signatures and links-in-context.
3499          *
3500          * @param $text String
3501          */
3502         public function preSaveTransform( $text ) {
3503                 global $wgParser, $wgUser;
3504                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3505         }
3506
3507         /* Caching functions */
3508
3509         /**
3510          * checkLastModified returns true if it has taken care of all
3511          * output to the client that is necessary for this request.
3512          * (that is, it has sent a cached version of the page)
3513          */
3514         protected function tryFileCache() {
3515                 static $called = false;
3516                 if( $called ) {
3517                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3518                         return false;
3519                 }
3520                 $called = true;
3521                 if( $this->isFileCacheable() ) {
3522                         $cache = new HTMLFileCache( $this->mTitle );
3523                         if( $cache->isFileCacheGood( $this->mTouched ) ) {
3524                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3525                                 $cache->loadFromFileCache();
3526                                 return true;
3527                         } else {
3528                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3529                                 ob_start( array(&$cache, 'saveToFileCache' ) );
3530                         }
3531                 } else {
3532                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3533                 }
3534                 return false;
3535         }
3536
3537         /**
3538          * Check if the page can be cached
3539          * @return bool
3540          */
3541         public function isFileCacheable() {
3542                 $cacheable = false;
3543                 if( HTMLFileCache::useFileCache() ) {
3544                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3545                         // Extension may have reason to disable file caching on some pages.
3546                         if( $cacheable ) {
3547                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3548                         }
3549                 }
3550                 return $cacheable;
3551         }
3552
3553         /**
3554          * Loads page_touched and returns a value indicating if it should be used
3555          *
3556          */
3557         public function checkTouched() {
3558                 if( !$this->mDataLoaded ) {
3559                         $this->loadPageData();
3560                 }
3561                 return !$this->mIsRedirect;
3562         }
3563
3564         /**
3565          * Get the page_touched field
3566          */
3567         public function getTouched() {
3568                 # Ensure that page data has been loaded
3569                 if( !$this->mDataLoaded ) {
3570                         $this->loadPageData();
3571                 }
3572                 return $this->mTouched;
3573         }
3574
3575         /**
3576          * Get the page_latest field
3577          */
3578         public function getLatest() {
3579                 if( !$this->mDataLoaded ) {
3580                         $this->loadPageData();
3581                 }
3582                 return (int)$this->mLatest;
3583         }
3584
3585         /**
3586          * Edit an article without doing all that other stuff
3587          * The article must already exist; link tables etc
3588          * are not updated, caches are not flushed.
3589          *
3590          * @param $text String: text submitted
3591          * @param $comment String: comment submitted
3592          * @param $minor Boolean: whereas it's a minor modification
3593          */
3594         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3595                 wfProfileIn( __METHOD__ );
3596
3597                 $dbw = wfGetDB( DB_MASTER );
3598                 $revision = new Revision( array(
3599                         'page'       => $this->getId(),
3600                         'text'       => $text,
3601                         'comment'    => $comment,
3602                         'minor_edit' => $minor ? 1 : 0,
3603                         ) );
3604                 $revision->insertOn( $dbw );
3605                 $this->updateRevisionOn( $dbw, $revision );
3606
3607                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $wgUser) );
3608
3609                 wfProfileOut( __METHOD__ );
3610         }
3611
3612         /**
3613          * Used to increment the view counter
3614          *
3615          * @param $id Integer: article id
3616          */
3617         public static function incViewCount( $id ) {
3618                 $id = intval( $id );
3619                 global $wgHitcounterUpdateFreq, $wgDBtype;
3620
3621                 $dbw = wfGetDB( DB_MASTER );
3622                 $pageTable = $dbw->tableName( 'page' );
3623                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3624                 $acchitsTable = $dbw->tableName( 'acchits' );
3625
3626                 if( $wgHitcounterUpdateFreq <= 1 ) {
3627                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3628                         return;
3629                 }
3630
3631                 # Not important enough to warrant an error page in case of failure
3632                 $oldignore = $dbw->ignoreErrors( true );
3633
3634                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3635
3636                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
3637                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
3638                         # Most of the time (or on SQL errors), skip row count check
3639                         $dbw->ignoreErrors( $oldignore );
3640                         return;
3641                 }
3642
3643                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
3644                 $row = $dbw->fetchObject( $res );
3645                 $rown = intval( $row->n );
3646                 if( $rown >= $wgHitcounterUpdateFreq ){
3647                         wfProfileIn( 'Article::incViewCount-collect' );
3648                         $old_user_abort = ignore_user_abort( true );
3649
3650                         if($wgDBtype == 'mysql')
3651                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
3652                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
3653                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
3654                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
3655                                 'GROUP BY hc_id');
3656                         $dbw->query("DELETE FROM $hitcounterTable");
3657                         if($wgDBtype == 'mysql') {
3658                                 $dbw->query('UNLOCK TABLES');
3659                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3660                                         'WHERE page_id = hc_id');
3661                         }
3662                         else {
3663                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3664                                         "FROM $acchitsTable WHERE page_id = hc_id");
3665                         }
3666                         $dbw->query("DROP TABLE $acchitsTable");
3667
3668                         ignore_user_abort( $old_user_abort );
3669                         wfProfileOut( 'Article::incViewCount-collect' );
3670                 }
3671                 $dbw->ignoreErrors( $oldignore );
3672         }
3673
3674         /**#@+
3675          * The onArticle*() functions are supposed to be a kind of hooks
3676          * which should be called whenever any of the specified actions
3677          * are done.
3678          *
3679          * This is a good place to put code to clear caches, for instance.
3680          *
3681          * This is called on page move and undelete, as well as edit
3682          *
3683          * @param $title a title object
3684          */
3685
3686         public static function onArticleCreate( $title ) {
3687                 # Update existence markers on article/talk tabs...
3688                 if( $title->isTalkPage() ) {
3689                         $other = $title->getSubjectPage();
3690                 } else {
3691                         $other = $title->getTalkPage();
3692                 }
3693                 $other->invalidateCache();
3694                 $other->purgeSquid();
3695
3696                 $title->touchLinks();
3697                 $title->purgeSquid();
3698                 $title->deleteTitleProtection();
3699         }
3700
3701         public static function onArticleDelete( $title ) {
3702                 global $wgMessageCache;
3703                 # Update existence markers on article/talk tabs...
3704                 if( $title->isTalkPage() ) {
3705                         $other = $title->getSubjectPage();
3706                 } else {
3707                         $other = $title->getTalkPage();
3708                 }
3709                 $other->invalidateCache();
3710                 $other->purgeSquid();
3711
3712                 $title->touchLinks();
3713                 $title->purgeSquid();
3714
3715                 # File cache
3716                 HTMLFileCache::clearFileCache( $title );
3717
3718                 # Messages
3719                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
3720                         $wgMessageCache->replace( $title->getDBkey(), false );
3721                 }
3722                 # Images
3723                 if( $title->getNamespace() == NS_FILE ) {
3724                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3725                         $update->doUpdate();
3726                 }
3727                 # User talk pages
3728                 if( $title->getNamespace() == NS_USER_TALK ) {
3729                         $user = User::newFromName( $title->getText(), false );
3730                         $user->setNewtalk( false );
3731                 }
3732                 # Image redirects
3733                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3734         }
3735
3736         /**
3737          * Purge caches on page update etc
3738          */
3739         public static function onArticleEdit( $title, $flags = '' ) {
3740                 global $wgDeferredUpdateList;
3741
3742                 // Invalidate caches of articles which include this page
3743                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3744
3745                 // Invalidate the caches of all pages which redirect here
3746                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3747
3748                 # Purge squid for this page only
3749                 $title->purgeSquid();
3750
3751                 # Clear file cache for this page only
3752                 HTMLFileCache::clearFileCache( $title );
3753         }
3754
3755         /**#@-*/
3756
3757         /**
3758          * Overriden by ImagePage class, only present here to avoid a fatal error
3759          * Called for ?action=revert
3760          */
3761         public function revert() {
3762                 global $wgOut;
3763                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3764         }
3765
3766         /**
3767          * Info about this page
3768          * Called for ?action=info when $wgAllowPageInfo is on.
3769          */
3770         public function info() {
3771                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3772
3773                 if( !$wgAllowPageInfo ) {
3774                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3775                         return;
3776                 }
3777
3778                 $page = $this->mTitle->getSubjectPage();
3779
3780                 $wgOut->setPagetitle( $page->getPrefixedText() );
3781                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3782                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3783
3784                 if( !$this->mTitle->exists() ) {
3785                         $wgOut->addHTML( '<div class="noarticletext">' );
3786                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3787                                 // This doesn't quite make sense; the user is asking for
3788                                 // information about the _page_, not the message... -- RC
3789                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3790                         } else {
3791                                 $msg = $wgUser->isLoggedIn()
3792                                         ? 'noarticletext'
3793                                         : 'noarticletextanon';
3794                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3795                         }
3796                         $wgOut->addHTML( '</div>' );
3797                 } else {
3798                         $dbr = wfGetDB( DB_SLAVE );
3799                         $wl_clause = array(
3800                                 'wl_title'     => $page->getDBkey(),
3801                                 'wl_namespace' => $page->getNamespace() );
3802                         $numwatchers = $dbr->selectField(
3803                                 'watchlist',
3804                                 'COUNT(*)',
3805                                 $wl_clause,
3806                                 __METHOD__,
3807                                 $this->getSelectOptions() );
3808
3809                         $pageInfo = $this->pageCountInfo( $page );
3810                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3811
3812                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3813                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3814                         if( $talkInfo ) {
3815                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3816                         }
3817                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3818                         if( $talkInfo ) {
3819                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3820                         }
3821                         $wgOut->addHTML( '</ul>' );
3822                 }
3823         }
3824
3825         /**
3826          * Return the total number of edits and number of unique editors
3827          * on a given page. If page does not exist, returns false.
3828          *
3829          * @param $title Title object
3830          * @return array
3831          */
3832         public function pageCountInfo( $title ) {
3833                 $id = $title->getArticleId();
3834                 if( $id == 0 ) {
3835                         return false;
3836                 }
3837                 $dbr = wfGetDB( DB_SLAVE );
3838                 $rev_clause = array( 'rev_page' => $id );
3839                 $edits = $dbr->selectField(
3840                         'revision',
3841                         'COUNT(rev_page)',
3842                         $rev_clause,
3843                         __METHOD__,
3844                         $this->getSelectOptions()
3845                 );
3846                 $authors = $dbr->selectField(
3847                         'revision',
3848                         'COUNT(DISTINCT rev_user_text)',
3849                         $rev_clause,
3850                         __METHOD__,
3851                         $this->getSelectOptions()
3852                 );
3853                 return array( 'edits' => $edits, 'authors' => $authors );
3854         }
3855
3856         /**
3857          * Return a list of templates used by this article.
3858          * Uses the templatelinks table
3859          *
3860          * @return Array of Title objects
3861          */
3862         public function getUsedTemplates() {
3863                 $result = array();
3864                 $id = $this->mTitle->getArticleID();
3865                 if( $id == 0 ) {
3866                         return array();
3867                 }
3868                 $dbr = wfGetDB( DB_SLAVE );
3869                 $res = $dbr->select( array( 'templatelinks' ),
3870                         array( 'tl_namespace', 'tl_title' ),
3871                         array( 'tl_from' => $id ),
3872                         __METHOD__ );
3873                 if( $res !== false ) {
3874                         foreach( $res as $row ) {
3875                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3876                         }
3877                 }
3878                 $dbr->freeResult( $res );
3879                 return $result;
3880         }
3881
3882         /**
3883          * Returns a list of hidden categories this page is a member of.
3884          * Uses the page_props and categorylinks tables.
3885          *
3886          * @return Array of Title objects
3887          */
3888         public function getHiddenCategories() {
3889                 $result = array();
3890                 $id = $this->mTitle->getArticleID();
3891                 if( $id == 0 ) {
3892                         return array();
3893                 }
3894                 $dbr = wfGetDB( DB_SLAVE );
3895                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3896                         array( 'cl_to' ),
3897                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3898                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3899                         __METHOD__ );
3900                 if( $res !== false ) {
3901                         foreach( $res as $row ) {
3902                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3903                         }
3904                 }
3905                 $dbr->freeResult( $res );
3906                 return $result;
3907         }
3908
3909         /**
3910         * Return an applicable autosummary if one exists for the given edit.
3911         * @param $oldtext String: the previous text of the page.
3912         * @param $newtext String: The submitted text of the page.
3913         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
3914         * @return string An appropriate autosummary, or an empty string.
3915         */
3916         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3917                 # Decide what kind of autosummary is needed.
3918
3919                 # Redirect autosummaries
3920                 $ot = Title::newFromRedirect( $oldtext );
3921                 $rt = Title::newFromRedirect( $newtext );
3922                 if( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
3923                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3924                 }
3925
3926                 # New page autosummaries
3927                 if( $flags & EDIT_NEW && strlen( $newtext ) ) {
3928                         # If they're making a new article, give its text, truncated, in the summary.
3929                         global $wgContLang;
3930                         $truncatedtext = $wgContLang->truncate(
3931                                 str_replace("\n", ' ', $newtext),
3932                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
3933                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3934                 }
3935
3936                 # Blanking autosummaries
3937                 if( $oldtext != '' && $newtext == '' ) {
3938                         return wfMsgForContent( 'autosumm-blank' );
3939                 } elseif( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500) {
3940                         # Removing more than 90% of the article
3941                         global $wgContLang;
3942                         $truncatedtext = $wgContLang->truncate(
3943                                 $newtext,
3944                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
3945                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3946                 }
3947
3948                 # If we reach this point, there's no applicable autosummary for our case, so our
3949                 # autosummary is empty.
3950                 return '';
3951         }
3952
3953         /**
3954          * Add the primary page-view wikitext to the output buffer
3955          * Saves the text into the parser cache if possible.
3956          * Updates templatelinks if it is out of date.
3957          *
3958          * @param $text String
3959          * @param $cache Boolean
3960          */
3961         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
3962                 global $wgOut;
3963
3964                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
3965                 $wgOut->addParserOutput( $this->mParserOutput );
3966         }
3967
3968         /**
3969          * This does all the heavy lifting for outputWikitext, except it returns the parser
3970          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
3971          * say, embedding thread pages within a discussion system (LiquidThreads)
3972          */
3973         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
3974                 global $wgParser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
3975
3976                 if ( !$parserOptions ) {
3977                         $parserOptions = $this->getParserOptions();
3978                 }
3979
3980                 $time = -wfTime();
3981                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
3982                         $parserOptions, true, true, $this->getRevIdFetched() );
3983                 $time += wfTime();
3984
3985                 # Timing hack
3986                 if( $time > 3 ) {
3987                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
3988                                 $this->mTitle->getPrefixedDBkey()));
3989                 }
3990
3991                 if( $wgEnableParserCache && $cache && $this && $this->mParserOutput->getCacheTime() != -1 ) {
3992                         $parserCache = ParserCache::singleton();
3993                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
3994                 }
3995                 // Make sure file cache is not used on uncacheable content.
3996                 // Output that has magic words in it can still use the parser cache
3997                 // (if enabled), though it will generally expire sooner.
3998                 if( $this->mParserOutput->getCacheTime() == -1 || $this->mParserOutput->containsOldMagic() ) {
3999                         $wgUseFileCache = false;
4000                 }
4001                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4002                 return $this->mParserOutput;
4003         }
4004
4005         /**
4006          * Get parser options suitable for rendering the primary article wikitext
4007          */
4008         public function getParserOptions() {
4009                 global $wgUser;
4010                 if ( !$this->mParserOptions ) {
4011                         $this->mParserOptions = new ParserOptions( $wgUser );
4012                         $this->mParserOptions->setTidy( true );
4013                         $this->mParserOptions->enableLimitReport();
4014                 }
4015                 return $this->mParserOptions;
4016         }
4017
4018         protected function doCascadeProtectionUpdates( $parserOutput ) {
4019                 if( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4020                         return;
4021                 }
4022
4023                 // templatelinks table may have become out of sync,
4024                 // especially if using variable-based transclusions.
4025                 // For paranoia, check if things have changed and if
4026                 // so apply updates to the database. This will ensure
4027                 // that cascaded protections apply as soon as the changes
4028                 // are visible.
4029
4030                 # Get templates from templatelinks
4031                 $id = $this->mTitle->getArticleID();
4032
4033                 $tlTemplates = array();
4034
4035                 $dbr = wfGetDB( DB_SLAVE );
4036                 $res = $dbr->select( array( 'templatelinks' ),
4037                         array( 'tl_namespace', 'tl_title' ),
4038                         array( 'tl_from' => $id ),
4039                         __METHOD__ );
4040
4041                 global $wgContLang;
4042                 foreach( $res as $row ) {
4043                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4044                 }
4045
4046                 # Get templates from parser output.
4047                 $poTemplates = array();
4048                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4049                         foreach ( $templates as $dbk => $id ) {
4050                                 $poTemplates["$ns:$dbk"] = true;
4051                         }
4052                 }
4053
4054                 # Get the diff
4055                 # Note that we simulate array_diff_key in PHP <5.0.x
4056                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4057
4058                 if( count( $templates_diff ) > 0 ) {
4059                         # Whee, link updates time.
4060                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4061                         $u->doUpdate();
4062                 }
4063         }
4064
4065         /**
4066          * Update all the appropriate counts in the category table, given that
4067          * we've added the categories $added and deleted the categories $deleted.
4068          *
4069          * @param $added array   The names of categories that were added
4070          * @param $deleted array The names of categories that were deleted
4071          * @return null
4072          */
4073         public function updateCategoryCounts( $added, $deleted ) {
4074                 $ns = $this->mTitle->getNamespace();
4075                 $dbw = wfGetDB( DB_MASTER );
4076
4077                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4078                 # exist, we might legitimately not create it, but it's simpler to just
4079                 # create it and then give it a negative value, since the value is bogus
4080                 # anyway.
4081                 #
4082                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4083                 $insertCats = array_merge( $added, $deleted );
4084                 if( !$insertCats ) {
4085                         # Okay, nothing to do
4086                         return;
4087                 }
4088                 $insertRows = array();
4089                 foreach( $insertCats as $cat ) {
4090                         $insertRows[] = array(  'cat_id' => $dbw->nextSequenceValue( 'category_id_seq' ),
4091                                                                                                                         'cat_title' => $cat );
4092                 }
4093                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4094
4095                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4096                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4097                 if( $ns == NS_CATEGORY ) {
4098                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4099                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4100                 } elseif( $ns == NS_FILE ) {
4101                         $addFields[]    = 'cat_files = cat_files + 1';
4102                         $removeFields[] = 'cat_files = cat_files - 1';
4103                 }
4104
4105                 if( $added ) {
4106                         $dbw->update(
4107                                 'category',
4108                                 $addFields,
4109                                 array( 'cat_title' => $added ),
4110                                 __METHOD__
4111                         );
4112                 }
4113                 if( $deleted ) {
4114                         $dbw->update(
4115                                 'category',
4116                                 $removeFields,
4117                                 array( 'cat_title' => $deleted ),
4118                                 __METHOD__
4119                         );
4120                 }
4121         }
4122
4123         /** Lightweight method to get the parser output for a page, checking the parser cache
4124           * and so on. Doesn't consider most of the stuff that Article::view is forced to
4125           * consider, so it's not appropriate to use there. */
4126         function getParserOutput( $oldid = null ) {
4127                 global $wgEnableParserCache, $wgUser, $wgOut;
4128
4129                 // Should the parser cache be used?
4130                 $useParserCache = $wgEnableParserCache &&
4131                           intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
4132                           $this->exists() &&
4133                                   $oldid === null;
4134
4135                 wfDebug( __METHOD__.': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4136                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
4137                         wfIncrStats( 'pcache_miss_stub' );
4138                 }
4139
4140                 $parserOutput = false;
4141                 if ( $useParserCache ) {
4142                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4143                 }
4144
4145                 if ( $parserOutput === false ) {
4146                         // Cache miss; parse and output it.
4147                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4148
4149                         return $this->getOutputFromWikitext( $rev->getText(), $useParserCache );
4150                 } else {
4151                         return $parserOutput;
4152                 }
4153         }
4154 }