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         /**@}}*/
  44
  45         /**
  46          * Constructor and clear the article
  47          * @param $title Reference to a Title object.
  48          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  49          */
  50         public function __construct( Title $title, $oldId = null ) {
  51                 $this->mTitle =& $title;
  52                 $this->mOldId = $oldId;
  53         }
  54
  55         /**
  56          * Constructor from an article article
  57          * @param $id The article ID to load
  58          */
  59         public static function newFromID( $id ) {
  60                 $t = Title::newFromID( $id );
  61                 return $t == null ? null : new Article( $t );
  62         }
  63
  64         /**
  65          * Tell the page view functions that this view was redirected
  66          * from another page on the wiki.
  67          * @param $from Title object.
  68          */
  69         public function setRedirectedFrom( $from ) {
  70                 $this->mRedirectedFrom = $from;
  71         }
  72
  73         /**
  74          * If this page is a redirect, get its target
  75          *
  76          * The target will be fetched from the redirect table if possible.
  77          * If this page doesn't have an entry there, call insertRedirect()
  78          * @return mixed Title object, or null if this page is not a redirect
  79          */
  80         public function getRedirectTarget() {
  81                 if( !$this->mTitle || !$this->mTitle->isRedirect() )
  82                         return null;
  83                 if( !is_null($this->mRedirectTarget) )
  84                         return $this->mRedirectTarget;
  85                 # Query the redirect table
  86                 $dbr = wfGetDB( DB_SLAVE );
  87                 $res = $dbr->select( 'redirect',
  88                         array('rd_namespace', 'rd_title'),
  89                         array('rd_from' => $this->getID()),
  90                         __METHOD__
  91                 );
  92                 if( $row = $dbr->fetchObject($res) ) {
  93                         return $this->mRedirectTarget = Title::makeTitle($row->rd_namespace, $row->rd_title);
  94                 }
  95                 # This page doesn't have an entry in the redirect table
  96                 return $this->mRedirectTarget = $this->insertRedirect();
  97         }
  98
  99         /**
 100          * Insert an entry for this page into the redirect table.
 101          *
 102          * Don't call this function directly unless you know what you're doing.
 103          * @return Title object
 104          */
 105         public function insertRedirect() {
 106                 $retval = Title::newFromRedirect( $this->getContent() );
 107                 if( !$retval ) {
 108                         return null;
 109                 }
 110                 $dbw = wfGetDB( DB_MASTER );
 111                 $dbw->replace( 'redirect', array('rd_from'),
 112                         array(
 113                                 'rd_from' => $this->getID(),
 114                                 'rd_namespace' => $retval->getNamespace(),
 115                                 'rd_title' => $retval->getDBKey()
 116                         ),
 117                         __METHOD__
 118                 );
 119                 return $retval;
 120         }
 121
 122         /**
 123          * Get the Title object this page redirects to
 124          *
 125          * @return mixed false, Title of in-wiki target, or string with URL
 126          */
 127         public function followRedirect() {
 128                 $text = $this->getContent();
 129                 return $this->followRedirectText( $text );
 130         }
 131
 132         /**
 133          * Get the Title object this text redirects to
 134          *
 135          * @return mixed false, Title of in-wiki target, or string with URL
 136          */
 137         public function followRedirectText( $text ) {
 138                 $rt = Title::newFromRedirectRecurse( $text ); // recurse through to only get the final target
 139                 # process if title object is valid and not special:userlogout
 140                 if( $rt ) {
 141                         if( $rt->getInterwiki() != '' ) {
 142                                 if( $rt->isLocal() ) {
 143                                         // Offsite wikis need an HTTP redirect.
 144                                         //
 145                                         // This can be hard to reverse and may produce loops,
 146                                         // so they may be disabled in the site configuration.
 147                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 148                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 149                                 }
 150                         } else {
 151                                 if( $rt->getNamespace() == NS_SPECIAL ) {
 152                                         // Gotta handle redirects to special pages differently:
 153                                         // Fill the HTTP response "Location" header and ignore
 154                                         // the rest of the page we're on.
 155                                         //
 156                                         // This can be hard to reverse, so they may be disabled.
 157                                         if( $rt->isSpecial( 'Userlogout' ) ) {
 158                                                 // rolleyes
 159                                         } else {
 160                                                 return $rt->getFullURL();
 161                                         }
 162                                 }
 163                                 return $rt;
 164                         }
 165                 }
 166                 // No or invalid redirect
 167                 return false;
 168         }
 169
 170         /**
 171          * get the title object of the article
 172          */
 173         public function getTitle() {
 174                 return $this->mTitle;
 175         }
 176
 177         /**
 178          * Clear the object
 179          * @private
 180          */
 181         public function clear() {
 182                 $this->mDataLoaded    = false;
 183                 $this->mContentLoaded = false;
 184
 185                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 186                 $this->mRedirectedFrom = null; # Title object if set
 187                 $this->mRedirectTarget = null; # Title object if set
 188                 $this->mUserText =
 189                 $this->mTimestamp = $this->mComment = '';
 190                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 191                 $this->mTouched = '19700101000000';
 192                 $this->mForUpdate = false;
 193                 $this->mIsRedirect = false;
 194                 $this->mRevIdFetched = 0;
 195                 $this->mRedirectUrl = false;
 196                 $this->mLatest = false;
 197                 $this->mPreparedEdit = false;
 198         }
 199
 200         /**
 201          * Note that getContent/loadContent do not follow redirects anymore.
 202          * If you need to fetch redirectable content easily, try
 203          * the shortcut in Article::followContent()
 204          *
 205          * @return Return the text of this revision
 206         */
 207         public function getContent() {
 208                 global $wgUser, $wgContLang, $wgOut, $wgMessageCache;
 209                 wfProfileIn( __METHOD__ );
 210                 if( $this->getID() === 0 ) {
 211                         # If this is a MediaWiki:x message, then load the messages
 212                         # and return the message value for x.
 213                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 214                                 # If this is a system message, get the default text.
 215                                 list( $message, $lang ) = $wgMessageCache->figureMessage( $wgContLang->lcfirst( $this->mTitle->getText() ) );
 216                                 $wgMessageCache->loadAllMessages( $lang );
 217                                 $text = wfMsgGetKey( $message, false, $lang, false );
 218                                 if( wfEmptyMsg( $message, $text ) )
 219                                         $text = '';
 220                         } else {
 221                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 222                         }
 223                         wfProfileOut( __METHOD__ );
 224                         return $text;
 225                 } else {
 226                         $this->loadContent();
 227                         wfProfileOut( __METHOD__ );
 228                         return $this->mContent;
 229                 }
 230         }
 231
 232         /**
 233          * Get the text of the current revision. No side-effects...
 234          *
 235          * @return Return the text of the current revision
 236         */
 237         public function getRawText() {
 238                 // Check process cache for current revision
 239                 if( $this->mContentLoaded && $this->mOldId == 0 ) {
 240                         return $this->mContent;
 241                 }
 242                 $rev = Revision::newFromTitle( $this->mTitle );
 243                 $text = $rev ? $rev->getRawText() : false;
 244                 return $text;
 245         }
 246
 247         /**
 248          * This function returns the text of a section, specified by a number ($section).
 249          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 250          * the first section before any such heading (section 0).
 251          *
 252          * If a section contains subsections, these are also returned.
 253          *
 254          * @param $text String: text to look in
 255          * @param $section Integer: section number
 256          * @return string text of the requested section
 257          * @deprecated
 258          */
 259         public function getSection( $text, $section ) {
 260                 global $wgParser;
 261                 return $wgParser->getSection( $text, $section );
 262         }
 263
 264         /**
 265          * Get the text that needs to be saved in order to undo all revisions
 266          * between $undo and $undoafter. Revisions must belong to the same page,
 267          * must exist and must not be deleted
 268          * @param $undo Revision
 269          * @param $undoafter Revision Must be an earlier revision than $undo
 270          * @return mixed string on success, false on failure
 271          */
 272         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 273                 $undo_text = $undo->getText();
 274                 $undoafter_text = $undoafter->getText();
 275                 $cur_text = $this->getContent();
 276                 if ( $cur_text == $undo_text ) {
 277                         # No use doing a merge if it's just a straight revert.
 278                         return $undoafter_text;
 279                 }
 280                 $undone_text = '';
 281                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) )
 282                         return false;
 283                 return $undone_text;
 284         }
 285
 286         /**
 287          * @return int The oldid of the article that is to be shown, 0 for the
 288          *             current revision
 289          */
 290         public function getOldID() {
 291                 if( is_null( $this->mOldId ) ) {
 292                         $this->mOldId = $this->getOldIDFromRequest();
 293                 }
 294                 return $this->mOldId;
 295         }
 296
 297         /**
 298          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 299          *
 300          * @return int The old id for the request
 301          */
 302         public function getOldIDFromRequest() {
 303                 global $wgRequest;
 304                 $this->mRedirectUrl = false;
 305                 $oldid = $wgRequest->getVal( 'oldid' );
 306                 if( isset( $oldid ) ) {
 307                         $oldid = intval( $oldid );
 308                         if( $wgRequest->getVal( 'direction' ) == 'next' ) {
 309                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 310                                 if( $nextid  ) {
 311                                         $oldid = $nextid;
 312                                 } else {
 313                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 314                                 }
 315                         } elseif( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 316                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 317                                 if( $previd ) {
 318                                         $oldid = $previd;
 319                                 }
 320                         }
 321                 }
 322                 if( !$oldid ) {
 323                         $oldid = 0;
 324                 }
 325                 return $oldid;
 326         }
 327
 328         /**
 329          * Load the revision (including text) into this object
 330          */
 331         function loadContent() {
 332                 if( $this->mContentLoaded ) return;
 333                 wfProfileIn( __METHOD__ );
 334                 # Query variables :P
 335                 $oldid = $this->getOldID();
 336                 # Pre-fill content with error message so that if something
 337                 # fails we'll have something telling us what we intended.
 338                 $this->mOldId = $oldid;
 339                 $this->fetchContent( $oldid );
 340                 wfProfileOut( __METHOD__ );
 341         }
 342
 343
 344         /**
 345          * Fetch a page record with the given conditions
 346          * @param $dbr Database object
 347          * @param $conditions Array
 348          */
 349         protected function pageData( $dbr, $conditions ) {
 350                 $fields = array(
 351                                 'page_id',
 352                                 'page_namespace',
 353                                 'page_title',
 354                                 'page_restrictions',
 355                                 'page_counter',
 356                                 'page_is_redirect',
 357                                 'page_is_new',
 358                                 'page_random',
 359                                 'page_touched',
 360                                 'page_latest',
 361                                 'page_len',
 362                 );
 363                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 364                 $row = $dbr->selectRow(
 365                         'page',
 366                         $fields,
 367                         $conditions,
 368                         __METHOD__
 369                 );
 370                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 371                 return $row ;
 372         }
 373
 374         /**
 375          * @param $dbr Database object
 376          * @param $title Title object
 377          */
 378         public function pageDataFromTitle( $dbr, $title ) {
 379                 return $this->pageData( $dbr, array(
 380                         'page_namespace' => $title->getNamespace(),
 381                         'page_title'     => $title->getDBkey() ) );
 382         }
 383
 384         /**
 385          * @param $dbr Database
 386          * @param $id Integer
 387          */
 388         protected function pageDataFromId( $dbr, $id ) {
 389                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 390         }
 391
 392         /**
 393          * Set the general counter, title etc data loaded from
 394          * some source.
 395          *
 396          * @param $data Database row object or "fromdb"
 397          */
 398         public function loadPageData( $data = 'fromdb' ) {
 399                 if( $data === 'fromdb' ) {
 400                         $dbr = wfGetDB( DB_MASTER );
 401                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 402                 }
 403
 404                 $lc = LinkCache::singleton();
 405                 if( $data ) {
 406                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 407
 408                         $this->mTitle->mArticleID = $data->page_id;
 409
 410                         # Old-fashioned restrictions
 411                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 412
 413                         $this->mCounter     = $data->page_counter;
 414                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 415                         $this->mIsRedirect  = $data->page_is_redirect;
 416                         $this->mLatest      = $data->page_latest;
 417                 } else {
 418                         if( is_object( $this->mTitle ) ) {
 419                                 $lc->addBadLinkObj( $this->mTitle );
 420                         }
 421                         $this->mTitle->mArticleID = 0;
 422                 }
 423
 424                 $this->mDataLoaded  = true;
 425         }
 426
 427         /**
 428          * Get text of an article from database
 429          * Does *NOT* follow redirects.
 430          * @param $oldid Int: 0 for whatever the latest revision is
 431          * @return string
 432          */
 433         function fetchContent( $oldid = 0 ) {
 434                 if( $this->mContentLoaded ) {
 435                         return $this->mContent;
 436                 }
 437
 438                 $dbr = wfGetDB( DB_MASTER );
 439
 440                 # Pre-fill content with error message so that if something
 441                 # fails we'll have something telling us what we intended.
 442                 $t = $this->mTitle->getPrefixedText();
 443                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 444                 $this->mContent = wfMsg( 'missing-article', $t, $d ) ;
 445
 446                 if( $oldid ) {
 447                         $revision = Revision::newFromId( $oldid );
 448                         if( is_null( $revision ) ) {
 449                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 450                                 return false;
 451                         }
 452                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 453                         if( !$data ) {
 454                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 455                                 return false;
 456                         }
 457                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 458                         $this->loadPageData( $data );
 459                 } else {
 460                         if( !$this->mDataLoaded ) {
 461                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 462                                 if( !$data ) {
 463                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 464                                         return false;
 465                                 }
 466                                 $this->loadPageData( $data );
 467                         }
 468                         $revision = Revision::newFromId( $this->mLatest );
 469                         if( is_null( $revision ) ) {
 470                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$this->mLatest}\n" );
 471                                 return false;
 472                         }
 473                 }
 474
 475                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 476                 // We should instead work with the Revision object when we need it...
 477                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 478
 479                 $this->mUser      = $revision->getUser();
 480                 $this->mUserText  = $revision->getUserText();
 481                 $this->mComment   = $revision->getComment();
 482                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 483
 484                 $this->mRevIdFetched = $revision->getId();
 485                 $this->mContentLoaded = true;
 486                 $this->mRevision =& $revision;
 487
 488                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 489
 490                 return $this->mContent;
 491         }
 492
 493         /**
 494          * Read/write accessor to select FOR UPDATE
 495          *
 496          * @param $x Mixed: FIXME
 497          */
 498         public function forUpdate( $x = NULL ) {
 499                 return wfSetVar( $this->mForUpdate, $x );
 500         }
 501
 502         /**
 503          * Get the database which should be used for reads
 504          *
 505          * @return Database
 506          * @deprecated - just call wfGetDB( DB_MASTER ) instead
 507          */
 508         function getDB() {
 509                 wfDeprecated( __METHOD__ );
 510                 return wfGetDB( DB_MASTER );
 511         }
 512
 513         /**
 514          * Get options for all SELECT statements
 515          *
 516          * @param $options Array: an optional options array which'll be appended to
 517          *                       the default
 518          * @return Array: options
 519          */
 520         protected function getSelectOptions( $options = '' ) {
 521                 if( $this->mForUpdate ) {
 522                         if( is_array( $options ) ) {
 523                                 $options[] = 'FOR UPDATE';
 524                         } else {
 525                                 $options = 'FOR UPDATE';
 526                         }
 527                 }
 528                 return $options;
 529         }
 530
 531         /**
 532          * @return int Page ID
 533          */
 534         public function getID() {
 535                 if( $this->mTitle ) {
 536                         return $this->mTitle->getArticleID();
 537                 } else {
 538                         return 0;
 539                 }
 540         }
 541
 542         /**
 543          * @return bool Whether or not the page exists in the database
 544          */
 545         public function exists() {
 546                 return $this->getId() > 0;
 547         }
 548
 549         /**
 550          * Check if this page is something we're going to be showing
 551          * some sort of sensible content for. If we return false, page
 552          * views (plain action=view) will return an HTTP 404 response,
 553          * so spiders and robots can know they're following a bad link.
 554          *
 555          * @return bool
 556          */
 557         public function hasViewableContent() {
 558                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 559         }
 560
 561         /**
 562          * @return int The view count for the page
 563          */
 564         public function getCount() {
 565                 if( -1 == $this->mCounter ) {
 566                         $id = $this->getID();
 567                         if( $id == 0 ) {
 568                                 $this->mCounter = 0;
 569                         } else {
 570                                 $dbr = wfGetDB( DB_SLAVE );
 571                                 $this->mCounter = $dbr->selectField( 'page',
 572                                         'page_counter',
 573                                         array( 'page_id' => $id ),
 574                                         __METHOD__,
 575                                         $this->getSelectOptions()
 576                                 );
 577                         }
 578                 }
 579                 return $this->mCounter;
 580         }
 581
 582         /**
 583          * Determine whether a page  would be suitable for being counted as an
 584          * article in the site_stats table based on the title & its content
 585          *
 586          * @param $text String: text to analyze
 587          * @return bool
 588          */
 589         public function isCountable( $text ) {
 590                 global $wgUseCommaCount;
 591
 592                 $token = $wgUseCommaCount ? ',' : '[[';
 593                 return $this->mTitle->isContentPage() && !$this->isRedirect($text) && in_string($token,$text);
 594         }
 595
 596         /**
 597          * Tests if the article text represents a redirect
 598          *
 599          * @param $text String: FIXME
 600          * @return bool
 601          */
 602         public function isRedirect( $text = false ) {
 603                 if( $text === false ) {
 604                         if( $this->mDataLoaded ) {
 605                                 return $this->mIsRedirect;
 606                         }
 607                         // Apparently loadPageData was never called
 608                         $this->loadContent();
 609                         $titleObj = Title::newFromRedirectRecurse( $this->fetchContent() );
 610                 } else {
 611                         $titleObj = Title::newFromRedirect( $text );
 612                 }
 613                 return $titleObj !== NULL;
 614         }
 615
 616         /**
 617          * Returns true if the currently-referenced revision is the current edit
 618          * to this page (and it exists).
 619          * @return bool
 620          */
 621         public function isCurrent() {
 622                 # If no oldid, this is the current version.
 623                 if( $this->getOldID() == 0 ) {
 624                         return true;
 625                 }
 626                 return $this->exists() && isset($this->mRevision) && $this->mRevision->isCurrent();
 627         }
 628
 629         /**
 630          * Loads everything except the text
 631          * This isn't necessary for all uses, so it's only done if needed.
 632          */
 633         protected function loadLastEdit() {
 634                 if( -1 != $this->mUser )
 635                         return;
 636
 637                 # New or non-existent articles have no user information
 638                 $id = $this->getID();
 639                 if( 0 == $id ) return;
 640
 641                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 642                 if( !is_null( $this->mLastRevision ) ) {
 643                         $this->mUser      = $this->mLastRevision->getUser();
 644                         $this->mUserText  = $this->mLastRevision->getUserText();
 645                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 646                         $this->mComment   = $this->mLastRevision->getComment();
 647                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 648                         $this->mRevIdFetched = $this->mLastRevision->getId();
 649                 }
 650         }
 651
 652         public function getTimestamp() {
 653                 // Check if the field has been filled by ParserCache::get()
 654                 if( !$this->mTimestamp ) {
 655                         $this->loadLastEdit();
 656                 }
 657                 return wfTimestamp(TS_MW, $this->mTimestamp);
 658         }
 659
 660         public function getUser() {
 661                 $this->loadLastEdit();
 662                 return $this->mUser;
 663         }
 664
 665         public function getUserText() {
 666                 $this->loadLastEdit();
 667                 return $this->mUserText;
 668         }
 669
 670         public function getComment() {
 671                 $this->loadLastEdit();
 672                 return $this->mComment;
 673         }
 674
 675         public function getMinorEdit() {
 676                 $this->loadLastEdit();
 677                 return $this->mMinorEdit;
 678         }
 679
 680         /* Use this to fetch the rev ID used on page views */
 681         public function getRevIdFetched() {
 682                 $this->loadLastEdit();
 683                 return $this->mRevIdFetched;
 684         }
 685
 686         /**
 687          * @param $limit Integer: default 0.
 688          * @param $offset Integer: default 0.
 689          */
 690         public function getContributors($limit = 0, $offset = 0) {
 691                 # XXX: this is expensive; cache this info somewhere.
 692
 693                 $contribs = array();
 694                 $dbr = wfGetDB( DB_SLAVE );
 695                 $revTable = $dbr->tableName( 'revision' );
 696                 $userTable = $dbr->tableName( 'user' );
 697                 $user = $this->getUser();
 698                 $pageId = $this->getId();
 699
 700                 $sql = "SELECT {$userTable}.*, MAX(rev_timestamp) as timestamp
 701                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 702                         WHERE rev_page = $pageId
 703                         AND rev_user != $user
 704                         GROUP BY rev_user, rev_user_text, user_real_name
 705                         ORDER BY timestamp DESC";
 706
 707                 if($limit > 0) { $sql .= ' LIMIT '.$limit; }
 708                 if($offset > 0) { $sql .= ' OFFSET '.$offset; }
 709
 710                 $sql .= ' '. $this->getSelectOptions();
 711
 712                 $res = $dbr->query($sql, __METHOD__ );
 713
 714                 return new UserArrayFromResult( $res );
 715         }
 716
 717         /**
 718          * This is the default action of the script: just view the page of
 719          * the given title.
 720         */
 721         public function view() {
 722                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 723                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 724                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 725                 global $wgDefaultRobotPolicy;
 726
 727                 wfProfileIn( __METHOD__ );
 728
 729                 # Get variables from query string
 730                 $oldid = $this->getOldID();
 731
 732                 # Try file cache
 733                 if( $oldid === 0 && $this->checkTouched() ) {
 734                         global $wgUseETag;
 735                         if( $wgUseETag ) {
 736                                 $parserCache = ParserCache::singleton();
 737                                 $wgOut->setETag( $parserCache->getETag($this,$wgUser) );
 738                         }
 739                         if( $wgOut->checkLastModified( $this->getTouched() ) ) {
 740                                 wfProfileOut( __METHOD__ );
 741                                 return;
 742                         } else if( $this->tryFileCache() ) {
 743                                 # tell wgOut that output is taken care of
 744                                 $wgOut->disable();
 745                                 $this->viewUpdates();
 746                                 wfProfileOut( __METHOD__ );
 747                                 return;
 748                         }
 749                 }
 750
 751                 $ns = $this->mTitle->getNamespace(); # shortcut
 752                 $sk = $wgUser->getSkin();
 753
 754                 # getOldID may want us to redirect somewhere else
 755                 if( $this->mRedirectUrl ) {
 756                         $wgOut->redirect( $this->mRedirectUrl );
 757                         wfProfileOut( __METHOD__ );
 758                         return;
 759                 }
 760
 761                 $diff = $wgRequest->getVal( 'diff' );
 762                 $rcid = $wgRequest->getVal( 'rcid' );
 763                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 764                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 765                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 766                 $return404 = false;
 767
 768                 $wgOut->setArticleFlag( true );
 769
 770                 # Discourage indexing of printable versions, but encourage following
 771                 if( $wgOut->isPrintable() ) {
 772                         $policy = 'noindex,follow';
 773                 } elseif( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 774                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 775                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 776                         # Honour customised robot policies for this namespace
 777                         $policy = $wgNamespaceRobotPolicies[$ns];
 778                 } else {
 779                         $policy = $wgDefaultRobotPolicy;
 780                 }
 781                 $wgOut->setRobotPolicy( $policy );
 782
 783                 # Allow admins to see deleted content if explicitly requested
 784                 $delId = $diff ? $diff : $oldid;
 785                 $unhide = $wgRequest->getInt('unhide') == 1 && $wgUser->matchEditToken( $wgRequest->getVal('token'), $delId );
 786                 # If we got diff and oldid in the query, we want to see a
 787                 # diff page instead of the article.
 788
 789                 if( !is_null( $diff ) ) {
 790                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 791
 792                         $htmldiff = $wgRequest->getVal( 'htmldiff' , false);
 793                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $htmldiff, $unhide );
 794                         // DifferenceEngine directly fetched the revision:
 795                         $this->mRevIdFetched = $de->mNewid;
 796                         $de->showDiffPage( $diffOnly );
 797
 798                         // Needed to get the page's current revision
 799                         $this->loadPageData();
 800                         if( $diff == 0 || $diff == $this->mLatest ) {
 801                                 # Run view updates for current revision only
 802                                 $this->viewUpdates();
 803                         }
 804                         wfProfileOut( __METHOD__ );
 805                         return;
 806                 }
 807
 808                 if( $ns == NS_USER || $ns == NS_USER_TALK ) {
 809                         # User/User_talk subpages are not modified. (bug 11443)
 810                         if( !$this->mTitle->isSubpage() ) {
 811                                 $block = new Block();
 812                                 if( $block->load( $this->mTitle->getBaseText() ) ) {
 813                                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 814                                 }
 815                         }
 816                 }
 817
 818                 # Should the parser cache be used?
 819                 $pcache = $this->useParserCache( $oldid );
 820                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 821                 if( $wgUser->getOption( 'stubthreshold' ) ) {
 822                         wfIncrStats( 'pcache_miss_stub' );
 823                 }
 824
 825                 $wasRedirected = false;
 826                 if( isset( $this->mRedirectedFrom ) ) {
 827                         // This is an internally redirected page view.
 828                         // We'll need a backlink to the source page for navigation.
 829                         if( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 830                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 831                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 832                                 $wgOut->setSubtitle( $s );
 833
 834                                 // Set the fragment if one was specified in the redirect
 835                                 if( strval( $this->mTitle->getFragment() ) != '' ) {
 836                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 837                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 838                                 }
 839                                 $wasRedirected = true;
 840                         }
 841                 } elseif( !empty( $rdfrom ) ) {
 842                         // This is an externally redirected view, from some other wiki.
 843                         // If it was reported from a trusted site, supply a backlink.
 844                         global $wgRedirectSources;
 845                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 846                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 847                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 848                                 $wgOut->setSubtitle( $s );
 849                                 $wasRedirected = true;
 850                         }
 851                 }
 852
 853                 $outputDone = false;
 854                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 855                 if( $pcache && $wgOut->tryParserCache( $this, $wgUser ) ) {
 856                         // Ensure that UI elements requiring revision ID have
 857                         // the correct version information.
 858                         $wgOut->setRevisionId( $this->mLatest );
 859                         $outputDone = true;
 860                 }
 861                 # Fetch content and check for errors
 862                 if( !$outputDone ) {
 863                         # If the article does not exist and was deleted, show the log
 864                         if( $this->getID() == 0 ) {
 865                                 $this->showDeletionLog();
 866                         }
 867                         $text = $this->getContent();
 868                         // For now, check also for ID until getContent actually returns
 869                         // false for pages that do not exists
 870                         if( $text === false || $this->getID() === 0 ) {
 871                                 # Failed to load, replace text with error message
 872                                 $t = $this->mTitle->getPrefixedText();
 873                                 if( $oldid ) {
 874                                         $d = wfMsgExt( 'missingarticle-rev', 'escape', $oldid );
 875                                         $text = wfMsgExt( 'missing-article', 'parsemag', $t, $d );
 876                                 // Always use page content for pages in the MediaWiki namespace
 877                                 // since it contains the default message
 878                                 } elseif ( $this->mTitle->getNamespace() != NS_MEDIAWIKI ) {
 879                                         $text = wfMsgExt( 'noarticletext', 'parsemag' );
 880                                 }
 881                         }
 882
 883                         # Non-existent pages
 884                         if( $this->getID() === 0 ) {
 885                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 886                                 $text = "<div class='noarticletext'>\n$text\n</div>";
 887                                 if( !$this->hasViewableContent() ) {
 888                                         // If there's no backing content, send a 404 Not Found
 889                                         // for better machine handling of broken links.
 890                                         $return404 = true;
 891                                 }
 892                         }
 893
 894                         if( $return404 ) {
 895                                 $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
 896                         }
 897
 898                         # Another whitelist check in case oldid is altering the title
 899                         if( !$this->mTitle->userCanRead() ) {
 900                                 $wgOut->loginToUse();
 901                                 $wgOut->output();
 902                                 $wgOut->disable();
 903                                 wfProfileOut( __METHOD__ );
 904                                 return;
 905                         }
 906
 907                         # For ?curid=x urls, disallow indexing
 908                         if( $wgRequest->getInt('curid') )
 909                                 $wgOut->setRobotPolicy( 'noindex,follow' );
 910
 911                         # We're looking at an old revision
 912                         if( !empty( $oldid ) ) {
 913                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 914                                 if( is_null( $this->mRevision ) ) {
 915                                         // FIXME: This would be a nice place to load the 'no such page' text.
 916                                 } else {
 917                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 918                                         # Allow admins to see deleted content if explicitly requested
 919                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 920                                                 if( !$unhide || !$this->mRevision->userCan(Revision::DELETED_TEXT) ) {
 921                                                         $wgOut->addWikiMsg( 'rev-deleted-text-permission' );
 922                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 923                                                         wfProfileOut( __METHOD__ );
 924                                                         return;
 925                                                 } else {
 926                                                         $wgOut->addWikiMsg( 'rev-deleted-text-view' );
 927                                                         // and we are allowed to see...
 928                                                 }
 929                                         }
 930                                 }
 931                         }
 932
 933                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 934
 935                          // Pages containing custom CSS or JavaScript get special treatment
 936                         if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 937                                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
 938                                 // Give hooks a chance to customise the output
 939                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 940                                         // Wrap the whole lot in a <pre> and don't parse
 941                                         $m = array();
 942                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 943                                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 944                                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 945                                         $wgOut->addHTML( "\n</pre>\n" );
 946                                 }
 947                         } else if( $rt = Title::newFromRedirectArray( $text ) ) { # get an array of redirect targets
 948                                 # Don't append the subtitle if this was an old revision
 949                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 950                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 951                                 $wgOut->addParserOutputNoText( $parseout );
 952                         } else if( $pcache ) {
 953                                 # Display content and save to parser cache
 954                                 $this->outputWikiText( $text );
 955                         } else {
 956                                 # Display content, don't attempt to save to parser cache
 957                                 # Don't show section-edit links on old revisions... this way lies madness.
 958                                 if( !$this->isCurrent() ) {
 959                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 960                                 }
 961                                 # Display content and don't save to parser cache
 962                                 # With timing hack -- TS 2006-07-26
 963                                 $time = -wfTime();
 964                                 $this->outputWikiText( $text, false );
 965                                 $time += wfTime();
 966
 967                                 # Timing hack
 968                                 if( $time > 3 ) {
 969                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 970                                                 $this->mTitle->getPrefixedDBkey()));
 971                                 }
 972
 973                                 if( !$this->isCurrent() ) {
 974                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 975                                 }
 976                         }
 977                 }
 978                 /* title may have been set from the cache */
 979                 $t = $wgOut->getPageTitle();
 980                 if( empty( $t ) ) {
 981                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 982
 983                         # For the main page, overwrite the <title> element with the con-
 984                         # tents of 'pagetitle-view-mainpage' instead of the default (if
 985                         # that's not empty).
 986                         if( $this->mTitle->equals( Title::newMainPage() ) &&
 987                         wfMsgForContent( 'pagetitle-view-mainpage' ) !== '' ) {
 988                                 $wgOut->setHTMLTitle( wfMsgForContent( 'pagetitle-view-mainpage' ) );
 989                         }
 990                 }
 991
 992                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 993                 if( $ns == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
 994                         $wgOut->addWikiMsg('anontalkpagetext');
 995                 }
 996
 997                 # If we have been passed an &rcid= parameter, we want to give the user a
 998                 # chance to mark this new article as patrolled.
 999                 if( !empty($rcid) && $this->mTitle->exists() && $this->mTitle->quickUserCan('patrol') ) {
1000                         $wgOut->addHTML(
1001                                 "<div class='patrollink'>" .
1002                                         wfMsgHtml( 'markaspatrolledlink',
1003                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
1004                                                 "action=markpatrolled&rcid=$rcid" )
1005                                         ) .
1006                                 '</div>'
1007                          );
1008                 }
1009
1010                 # Trackbacks
1011                 if( $wgUseTrackbacks ) {
1012                         $this->addTrackbacks();
1013                 }
1014
1015                 $this->viewUpdates();
1016                 wfProfileOut( __METHOD__ );
1017         }
1018
1019         protected function showDeletionLog() {
1020                 global $wgUser, $wgOut;
1021                 $loglist = new LogEventsList( $wgUser->getSkin(), $wgOut );
1022                 $pager = new LogPager( $loglist, 'delete', false, $this->mTitle->getPrefixedText() );
1023                 if( $pager->getNumRows() > 0 ) {
1024                         $pager->mLimit = 10;
1025                         $wgOut->addHTML( '<div class="mw-warning-with-logexcerpt">' );
1026                         $wgOut->addWikiMsg( 'deleted-notice' );
1027                         $wgOut->addHTML(
1028                                 $loglist->beginLogEventsList() .
1029                                 $pager->getBody() .
1030                                 $loglist->endLogEventsList()
1031                         );
1032                         if( $pager->getNumRows() > 10 ) {
1033                                 $wgOut->addHTML( $wgUser->getSkin()->link(
1034                                         SpecialPage::getTitleFor( 'Log' ),
1035                                         wfMsgHtml( 'deletelog-fulllog' ),
1036                                         array(),
1037                                         array( 'type' => 'delete', 'page' => $this->mTitle->getPrefixedText() )
1038                                 ) );
1039                         }
1040                         $wgOut->addHTML( '</div>' );
1041                 }
1042         }
1043
1044         /*
1045         * Should the parser cache be used?
1046         */
1047         protected function useParserCache( $oldid ) {
1048                 global $wgUser, $wgEnableParserCache;
1049
1050                 return $wgEnableParserCache
1051                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
1052                         && $this->exists()
1053                         && empty( $oldid )
1054                         && !$this->mTitle->isCssOrJsPage()
1055                         && !$this->mTitle->isCssJsSubpage();
1056         }
1057
1058         /**
1059          * View redirect
1060          * @param $target Title object or Array of destination(s) to redirect
1061          * @param $appendSubtitle Boolean [optional]
1062          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1063          */
1064         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1065                 global $wgParser, $wgOut, $wgContLang, $wgStylePath, $wgUser;
1066                 # Display redirect
1067                 if( !is_array( $target ) ) {
1068                         $target = array( $target );
1069                 }
1070                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
1071                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1072                 $imageUrl2 = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1073                 $alt2 = $wgContLang->isRTL() ? '&larr;' : '&rarr;'; // should -> and <- be used instead of entities?
1074
1075                 if( $appendSubtitle ) {
1076                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1077                 }
1078                 $sk = $wgUser->getSkin();
1079                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1080                 $title = array_shift( $target );
1081                 if( $forceKnown ) {
1082                         $link = $sk->makeKnownLinkObj( $title, htmlspecialchars( $title->getFullText() ) );
1083                 } else {
1084                         $link = $sk->makeLinkObj( $title, htmlspecialchars( $title->getFullText() ) );
1085                 }
1086                 // automatically append redirect=no to each link, since most of them are redirect pages themselves
1087                 foreach( $target as $rt ) {
1088                         if( $forceKnown ) {
1089                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1090                                         . $sk->makeKnownLinkObj( $rt, htmlspecialchars( $rt->getFullText() ) );
1091                         } else {
1092                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1093                                         . $sk->makeLinkObj( $rt, htmlspecialchars( $rt->getFullText() ) );
1094                         }
1095                 }
1096                 return '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
1097                         '<span class="redirectText">'.$link.'</span>';
1098
1099         }
1100
1101         public function addTrackbacks() {
1102                 global $wgOut, $wgUser;
1103                 $dbr = wfGetDB( DB_SLAVE );
1104                 $tbs = $dbr->select( 'trackbacks',
1105                         array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
1106                         array('tb_page' => $this->getID() )
1107                 );
1108                 if( !$dbr->numRows($tbs) ) return;
1109
1110                 $tbtext = "";
1111                 while( $o = $dbr->fetchObject($tbs) ) {
1112                         $rmvtxt = "";
1113                         if( $wgUser->isAllowed( 'trackback' ) ) {
1114                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid=" .
1115                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1116                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1117                         }
1118                         $tbtext .= "\n";
1119                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
1120                                         $o->tb_title,
1121                                         $o->tb_url,
1122                                         $o->tb_ex,
1123                                         $o->tb_name,
1124                                         $rmvtxt);
1125                 }
1126                 $wgOut->addWikiMsg( 'trackbackbox', $tbtext );
1127                 $this->mTitle->invalidateCache();
1128         }
1129
1130         public function deletetrackback() {
1131                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
1132                 if( !$wgUser->matchEditToken($wgRequest->getVal('token')) ) {
1133                         $wgOut->addWikiMsg( 'sessionfailure' );
1134                         return;
1135                 }
1136
1137                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1138                 if( count($permission_errors) ) {
1139                         $wgOut->showPermissionsErrorPage( $permission_errors );
1140                         return;
1141                 }
1142
1143                 $db = wfGetDB( DB_MASTER );
1144                 $db->delete( 'trackbacks', array('tb_id' => $wgRequest->getInt('tbid')) );
1145
1146                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1147                 $this->mTitle->invalidateCache();
1148         }
1149
1150         public function render() {
1151                 global $wgOut;
1152                 $wgOut->setArticleBodyOnly(true);
1153                 $this->view();
1154         }
1155
1156         /**
1157          * Handle action=purge
1158          */
1159         public function purge() {
1160                 global $wgUser, $wgRequest, $wgOut;
1161                 if( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1162                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1163                                 $this->doPurge();
1164                                 $this->view();
1165                         }
1166                 } else {
1167                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1168                         $button = wfMsgExt( 'confirm_purge_button', array('escapenoentities') );
1169                         $form = "<form method=\"post\" action=\"$action\">\n" .
1170                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1171                                         "</form>\n";
1172                         $top = wfMsgExt( 'confirm-purge-top', array('parse') );
1173                         $bottom = wfMsgExt( 'confirm-purge-bottom', array('parse') );
1174                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1175                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1176                         $wgOut->addHTML( $top . $form . $bottom );
1177                 }
1178         }
1179
1180         /**
1181          * Perform the actions of a page purging
1182          */
1183         public function doPurge() {
1184                 global $wgUseSquid;
1185                 // Invalidate the cache
1186                 $this->mTitle->invalidateCache();
1187
1188                 if( $wgUseSquid ) {
1189                         // Commit the transaction before the purge is sent
1190                         $dbw = wfGetDB( DB_MASTER );
1191                         $dbw->immediateCommit();
1192
1193                         // Send purge
1194                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1195                         $update->doUpdate();
1196                 }
1197                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1198                         global $wgMessageCache;
1199                         if( $this->getID() == 0 ) {
1200                                 $text = false;
1201                         } else {
1202                                 $text = $this->getRawText();
1203                         }
1204                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1205                 }
1206         }
1207
1208         /**
1209          * Insert a new empty page record for this article.
1210          * This *must* be followed up by creating a revision
1211          * and running $this->updateToLatest( $rev_id );
1212          * or else the record will be left in a funky state.
1213          * Best if all done inside a transaction.
1214          *
1215          * @param $dbw Database
1216          * @return int The newly created page_id key, or false if the title already existed
1217          * @private
1218          */
1219         public function insertOn( $dbw ) {
1220                 wfProfileIn( __METHOD__ );
1221
1222                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1223                 $dbw->insert( 'page', array(
1224                         'page_id'           => $page_id,
1225                         'page_namespace'    => $this->mTitle->getNamespace(),
1226                         'page_title'        => $this->mTitle->getDBkey(),
1227                         'page_counter'      => 0,
1228                         'page_restrictions' => '',
1229                         'page_is_redirect'  => 0, # Will set this shortly...
1230                         'page_is_new'       => 1,
1231                         'page_random'       => wfRandom(),
1232                         'page_touched'      => $dbw->timestamp(),
1233                         'page_latest'       => 0, # Fill this in shortly...
1234                         'page_len'          => 0, # Fill this in shortly...
1235                 ), __METHOD__, 'IGNORE' );
1236
1237                 $affected = $dbw->affectedRows();
1238                 if( $affected ) {
1239                         $newid = $dbw->insertId();
1240                         $this->mTitle->resetArticleId( $newid );
1241                 }
1242                 wfProfileOut( __METHOD__ );
1243                 return $affected ? $newid : false;
1244         }
1245
1246         /**
1247          * Update the page record to point to a newly saved revision.
1248          *
1249          * @param $dbw Database object
1250          * @param $revision Revision: For ID number, and text used to set
1251                             length and redirect status fields
1252          * @param $lastRevision Integer: if given, will not overwrite the page field
1253          *                      when different from the currently set value.
1254          *                      Giving 0 indicates the new page flag should be set
1255          *                      on.
1256          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1257          *                                                       removing rows in redirect table.
1258          * @return bool true on success, false on failure
1259          * @private
1260          */
1261         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1262                 wfProfileIn( __METHOD__ );
1263
1264                 $text = $revision->getText();
1265                 $rt = Title::newFromRedirect( $text );
1266
1267                 $conditions = array( 'page_id' => $this->getId() );
1268                 if( !is_null( $lastRevision ) ) {
1269                         # An extra check against threads stepping on each other
1270                         $conditions['page_latest'] = $lastRevision;
1271                 }
1272
1273                 $dbw->update( 'page',
1274                         array( /* SET */
1275                                 'page_latest'      => $revision->getId(),
1276                                 'page_touched'     => $dbw->timestamp(),
1277                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1278                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1279                                 'page_len'         => strlen( $text ),
1280                         ),
1281                         $conditions,
1282                         __METHOD__ );
1283
1284                 $result = $dbw->affectedRows() != 0;
1285                 if( $result ) {
1286                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1287                 }
1288
1289                 wfProfileOut( __METHOD__ );
1290                 return $result;
1291         }
1292
1293         /**
1294          * Add row to the redirect table if this is a redirect, remove otherwise.
1295          *
1296          * @param $dbw Database
1297          * @param $redirectTitle a title object pointing to the redirect target,
1298          *                                               or NULL if this is not a redirect
1299          * @param $lastRevIsRedirect If given, will optimize adding and
1300          *                                                       removing rows in redirect table.
1301          * @return bool true on success, false on failure
1302          * @private
1303          */
1304         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1305                 // Always update redirects (target link might have changed)
1306                 // Update/Insert if we don't know if the last revision was a redirect or not
1307                 // Delete if changing from redirect to non-redirect
1308                 $isRedirect = !is_null($redirectTitle);
1309                 if($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1310                         wfProfileIn( __METHOD__ );
1311                         if( $isRedirect ) {
1312                                 // This title is a redirect, Add/Update row in the redirect table
1313                                 $set = array( /* SET */
1314                                         'rd_namespace' => $redirectTitle->getNamespace(),
1315                                         'rd_title'     => $redirectTitle->getDBkey(),
1316                                         'rd_from'      => $this->getId(),
1317                                 );
1318                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1319                         } else {
1320                                 // This is not a redirect, remove row from redirect table
1321                                 $where = array( 'rd_from' => $this->getId() );
1322                                 $dbw->delete( 'redirect', $where, __METHOD__);
1323                         }
1324                         if( $this->getTitle()->getNamespace() == NS_FILE ) {
1325                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1326                         }
1327                         wfProfileOut( __METHOD__ );
1328                         return ( $dbw->affectedRows() != 0 );
1329                 }
1330                 return true;
1331         }
1332
1333         /**
1334          * If the given revision is newer than the currently set page_latest,
1335          * update the page record. Otherwise, do nothing.
1336          *
1337          * @param $dbw Database object
1338          * @param $revision Revision object
1339          */
1340         public function updateIfNewerOn( &$dbw, $revision ) {
1341                 wfProfileIn( __METHOD__ );
1342                 $row = $dbw->selectRow(
1343                         array( 'revision', 'page' ),
1344                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1345                         array(
1346                                 'page_id' => $this->getId(),
1347                                 'page_latest=rev_id' ),
1348                         __METHOD__ );
1349                 if( $row ) {
1350                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1351                                 wfProfileOut( __METHOD__ );
1352                                 return false;
1353                         }
1354                         $prev = $row->rev_id;
1355                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1356                 } else {
1357                         # No or missing previous revision; mark the page as new
1358                         $prev = 0;
1359                         $lastRevIsRedirect = null;
1360                 }
1361                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1362                 wfProfileOut( __METHOD__ );
1363                 return $ret;
1364         }
1365
1366         /**
1367          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1368          * @return string Complete article text, or null if error
1369          */
1370         public function replaceSection( $section, $text, $summary = '', $edittime = NULL ) {
1371                 wfProfileIn( __METHOD__ );
1372                 if( strval( $section ) == '' ) {
1373                         // Whole-page edit; let the whole text through
1374                 } else {
1375                         if( is_null($edittime) ) {
1376                                 $rev = Revision::newFromTitle( $this->mTitle );
1377                         } else {
1378                                 $dbw = wfGetDB( DB_MASTER );
1379                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1380                         }
1381                         if( !$rev ) {
1382                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1383                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1384                                 return null;
1385                         }
1386                         $oldtext = $rev->getText();
1387
1388                         if( $section == 'new' ) {
1389                                 # Inserting a new section
1390                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1391                                 $text = strlen( trim( $oldtext ) ) > 0
1392                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1393                                                 : "{$subject}{$text}";
1394                         } else {
1395                                 # Replacing an existing section; roll out the big guns
1396                                 global $wgParser;
1397                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1398                         }
1399                 }
1400                 wfProfileOut( __METHOD__ );
1401                 return $text;
1402         }
1403
1404         /**
1405          * @deprecated use Article::doEdit()
1406          */
1407         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1408                 wfDeprecated( __METHOD__ );
1409                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1410                         ( $isminor ? EDIT_MINOR : 0 ) |
1411                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1412                         ( $bot ? EDIT_FORCE_BOT : 0 );
1413
1414                 # If this is a comment, add the summary as headline
1415                 if( $comment && $summary != "" ) {
1416                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1417                 }
1418
1419                 $this->doEdit( $text, $summary, $flags );
1420
1421                 $dbw = wfGetDB( DB_MASTER );
1422                 if($watchthis) {
1423                         if(!$this->mTitle->userIsWatching()) {
1424                                 $dbw->begin();
1425                                 $this->doWatch();
1426                                 $dbw->commit();
1427                         }
1428                 } else {
1429                         if( $this->mTitle->userIsWatching() ) {
1430                                 $dbw->begin();
1431                                 $this->doUnwatch();
1432                                 $dbw->commit();
1433                         }
1434                 }
1435                 $this->doRedirect( $this->isRedirect( $text ) );
1436         }
1437
1438         /**
1439          * @deprecated use Article::doEdit()
1440          */
1441         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1442                 wfDeprecated( __METHOD__ );
1443                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1444                         ( $minor ? EDIT_MINOR : 0 ) |
1445                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1446
1447                 $status = $this->doEdit( $text, $summary, $flags );
1448                 if( !$status->isOK() ) {
1449                         return false;
1450                 }
1451
1452                 $dbw = wfGetDB( DB_MASTER );
1453                 if( $watchthis ) {
1454                         if(!$this->mTitle->userIsWatching()) {
1455                                 $dbw->begin();
1456                                 $this->doWatch();
1457                                 $dbw->commit();
1458                         }
1459                 } else {
1460                         if( $this->mTitle->userIsWatching() ) {
1461                                 $dbw->begin();
1462                                 $this->doUnwatch();
1463                                 $dbw->commit();
1464                         }
1465                 }
1466
1467                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1468                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1469
1470                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1471                 return true;
1472         }
1473
1474         /**
1475          * Article::doEdit()
1476          *
1477          * Change an existing article or create a new article. Updates RC and all necessary caches,
1478          * optionally via the deferred update array.
1479          *
1480          * $wgUser must be set before calling this function.
1481          *
1482          * @param $text String: new text
1483          * @param $summary String: edit summary
1484          * @param $flags Integer bitfield:
1485          *      EDIT_NEW
1486          *          Article is known or assumed to be non-existent, create a new one
1487          *      EDIT_UPDATE
1488          *          Article is known or assumed to be pre-existing, update it
1489          *      EDIT_MINOR
1490          *          Mark this edit minor, if the user is allowed to do so
1491          *      EDIT_SUPPRESS_RC
1492          *          Do not log the change in recentchanges
1493          *      EDIT_FORCE_BOT
1494          *          Mark the edit a "bot" edit regardless of user rights
1495          *      EDIT_DEFER_UPDATES
1496          *          Defer some of the updates until the end of index.php
1497          *      EDIT_AUTOSUMMARY
1498          *          Fill in blank summaries with generated text where possible
1499          *
1500          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1501          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1502          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1503          * edit-already-exists error will be returned. These two conditions are also possible with
1504          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1505          *
1506          * @param $baseRevId the revision ID this edit was based off, if any
1507          * @param $user Optional user object, $wgUser will be used if not passed
1508          *
1509          * @return Status object. Possible errors:
1510          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1511          *     edit-gone-missing:       In update mode, but the article didn't exist
1512          *     edit-conflict:           In update mode, the article changed unexpectedly
1513          *     edit-no-change:          Warning that the text was the same as before
1514          *     edit-already-exists:     In creation mode, but the article already exists
1515          *
1516          *  Extensions may define additional errors.
1517          *
1518          *  $return->value will contain an associative array with members as follows:
1519          *     new:                     Boolean indicating if the function attempted to create a new article
1520          *     revision:                The revision object for the inserted revision, or null
1521          *
1522          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1523          */
1524         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1525                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1526
1527                 # Low-level sanity check
1528                 if( $this->mTitle->getText() == '' ) {
1529                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1530                 }
1531
1532                 wfProfileIn( __METHOD__ );
1533
1534                 $user = is_null($user) ? $wgUser : $user;
1535                 $status = Status::newGood( array() );
1536
1537                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1538                 $this->loadPageData();
1539
1540                 if( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1541                         $aid = $this->mTitle->getArticleID();
1542                         if( $aid ) {
1543                                 $flags |= EDIT_UPDATE;
1544                         } else {
1545                                 $flags |= EDIT_NEW;
1546                         }
1547                 }
1548
1549                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1550                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1551                 {
1552                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1553                         wfProfileOut( __METHOD__ );
1554                         if( $status->isOK() ) {
1555                                 $status->fatal( 'edit-hook-aborted');
1556                         }
1557                         return $status;
1558                 }
1559
1560                 # Silently ignore EDIT_MINOR if not allowed
1561                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed('minoredit');
1562                 $bot = $flags & EDIT_FORCE_BOT;
1563
1564                 $oldtext = $this->getRawText(); // current revision
1565                 $oldsize = strlen( $oldtext );
1566
1567                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1568                 if( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1569                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1570                 }
1571
1572                 $editInfo = $this->prepareTextForEdit( $text );
1573                 $text = $editInfo->pst;
1574                 $newsize = strlen( $text );
1575
1576                 $dbw = wfGetDB( DB_MASTER );
1577                 $now = wfTimestampNow();
1578
1579                 if( $flags & EDIT_UPDATE ) {
1580                         # Update article, but only if changed.
1581                         $status->value['new'] = false;
1582                         # Make sure the revision is either completely inserted or not inserted at all
1583                         if( !$wgDBtransactions ) {
1584                                 $userAbort = ignore_user_abort( true );
1585                         }
1586
1587                         $revisionId = 0;
1588
1589                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1590
1591                         if( $changed ) {
1592                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1593                                   - (int)$this->isCountable( $oldtext );
1594                                 $this->mTotalAdjustment = 0;
1595
1596                                 if( !$this->mLatest ) {
1597                                         # Article gone missing
1598                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1599                                         $status->fatal( 'edit-gone-missing' );
1600                                         wfProfileOut( __METHOD__ );
1601                                         return $status;
1602                                 }
1603
1604                                 $revision = new Revision( array(
1605                                         'page'       => $this->getId(),
1606                                         'comment'    => $summary,
1607                                         'minor_edit' => $isminor,
1608                                         'text'       => $text,
1609                                         'parent_id'  => $this->mLatest,
1610                                         'user'       => $user->getId(),
1611                                         'user_text'  => $user->getName(),
1612                                         ) );
1613
1614                                 $dbw->begin();
1615                                 $revisionId = $revision->insertOn( $dbw );
1616
1617                                 # Update page
1618                                 #
1619                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1620                                 # during the course of this function. This makes sure that EditPage can detect
1621                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1622                                 # before this function is called. A previous function used a separate query, this
1623                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1624                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1625
1626                                 if( !$ok ) {
1627                                         /* Belated edit conflict! Run away!! */
1628                                         $status->fatal( 'edit-conflict' );
1629                                         # Delete the invalid revision if the DB is not transactional
1630                                         if( !$wgDBtransactions ) {
1631                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1632                                         }
1633                                         $revisionId = 0;
1634                                         $dbw->rollback();
1635                                 } else {
1636                                         global $wgUseRCPatrol;
1637                                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, $baseRevId, $user) );
1638                                         # Update recentchanges
1639                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1640                                                 # Mark as patrolled if the user can do so
1641                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan('autopatrol');
1642                                                 # Add RC row to the DB
1643                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1644                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1645                                                         $revisionId, $patrolled
1646                                                 );
1647                                                 # Log auto-patrolled edits
1648                                                 if( $patrolled ) {
1649                                                         PatrolLog::record( $rc, true );
1650                                                 }
1651                                         }
1652                                         $user->incEditCount();
1653                                         $dbw->commit();
1654                                 }
1655                         } else {
1656                                 $status->warning( 'edit-no-change' );
1657                                 $revision = null;
1658                                 // Keep the same revision ID, but do some updates on it
1659                                 $revisionId = $this->getRevIdFetched();
1660                                 // Update page_touched, this is usually implicit in the page update
1661                                 // Other cache updates are done in onArticleEdit()
1662                                 $this->mTitle->invalidateCache();
1663                         }
1664
1665                         if( !$wgDBtransactions ) {
1666                                 ignore_user_abort( $userAbort );
1667                         }
1668                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1669                         if( !$status->isOK() ) {
1670                                 wfProfileOut( __METHOD__ );
1671                                 return $status;
1672                         }
1673
1674                         # Invalidate cache of this article and all pages using this article
1675                         # as a template. Partly deferred. Leave templatelinks for editUpdates().
1676                         Article::onArticleEdit( $this->mTitle, 'skiptransclusions' );
1677                         # Update links tables, site stats, etc.
1678                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1679                 } else {
1680                         # Create new article
1681                         $status->value['new'] = true;
1682
1683                         # Set statistics members
1684                         # We work out if it's countable after PST to avoid counter drift
1685                         # when articles are created with {{subst:}}
1686                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1687                         $this->mTotalAdjustment = 1;
1688
1689                         $dbw->begin();
1690
1691                         # Add the page record; stake our claim on this title!
1692                         # This will return false if the article already exists
1693                         $newid = $this->insertOn( $dbw );
1694
1695                         if( $newid === false ) {
1696                                 $dbw->rollback();
1697                                 $status->fatal( 'edit-already-exists' );
1698                                 wfProfileOut( __METHOD__ );
1699                                 return $status;
1700                         }
1701
1702                         # Save the revision text...
1703                         $revision = new Revision( array(
1704                                 'page'       => $newid,
1705                                 'comment'    => $summary,
1706                                 'minor_edit' => $isminor,
1707                                 'text'       => $text,
1708                                 'user'       => $user->getId(),
1709                                 'user_text'  => $user->getName(),
1710                                 ) );
1711                         $revisionId = $revision->insertOn( $dbw );
1712
1713                         $this->mTitle->resetArticleID( $newid );
1714
1715                         # Update the page record with revision data
1716                         $this->updateRevisionOn( $dbw, $revision, 0 );
1717
1718                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $user) );
1719                         # Update recentchanges
1720                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1721                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1722                                 # Mark as patrolled if the user can do so
1723                                 $patrolled = ($wgUseRCPatrol || $wgUseNPPatrol) && $this->mTitle->userCan('autopatrol');
1724                                 # Add RC row to the DB
1725                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1726                                         '', strlen($text), $revisionId, $patrolled );
1727                                 # Log auto-patrolled edits
1728                                 if( $patrolled ) {
1729                                         PatrolLog::record( $rc, true );
1730                                 }
1731                         }
1732                         $user->incEditCount();
1733                         $dbw->commit();
1734
1735                         # Update links, etc.
1736                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1737
1738                         # Clear caches
1739                         Article::onArticleCreate( $this->mTitle );
1740
1741                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1742                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1743                 }
1744
1745                 # Do updates right now unless deferral was requested
1746                 if( !( $flags & EDIT_DEFER_UPDATES ) ) {
1747                         wfDoUpdates();
1748                 }
1749
1750                 // Return the new revision (or null) to the caller
1751                 $status->value['revision'] = $revision;
1752
1753                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1754                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status ) );
1755
1756                 wfProfileOut( __METHOD__ );
1757                 return $status;
1758         }
1759
1760         /**
1761          * @deprecated wrapper for doRedirect
1762          */
1763         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1764                 wfDeprecated( __METHOD__ );
1765                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1766         }
1767
1768         /**
1769          * Output a redirect back to the article.
1770          * This is typically used after an edit.
1771          *
1772          * @param $noRedir Boolean: add redirect=no
1773          * @param $sectionAnchor String: section to redirect to, including "#"
1774          * @param $extraQuery String: extra query params
1775          */
1776         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1777                 global $wgOut;
1778                 if( $noRedir ) {
1779                         $query = 'redirect=no';
1780                         if( $extraQuery )
1781                                 $query .= "&$query";
1782                 } else {
1783                         $query = $extraQuery;
1784                 }
1785                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1786         }
1787
1788         /**
1789          * Mark this particular edit/page as patrolled
1790          */
1791         public function markpatrolled() {
1792                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
1793                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1794
1795                 # If we haven't been given an rc_id value, we can't do anything
1796                 $rcid = (int) $wgRequest->getVal('rcid');
1797                 $rc = RecentChange::newFromId($rcid);
1798                 if( is_null($rc) ) {
1799                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1800                         return;
1801                 }
1802
1803                 #It would be nice to see where the user had actually come from, but for now just guess
1804                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'newpages' : 'recentchanges';
1805                 $return = SpecialPage::getTitleFor( $returnto );
1806
1807                 $dbw = wfGetDB( DB_MASTER );
1808                 $errors = $rc->doMarkPatrolled();
1809
1810                 if( in_array(array('rcpatroldisabled'), $errors) ) {
1811                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1812                         return;
1813                 }
1814
1815                 if( in_array(array('hookaborted'), $errors) ) {
1816                         // The hook itself has handled any output
1817                         return;
1818                 }
1819
1820                 if( in_array(array('markedaspatrollederror-noautopatrol'), $errors) ) {
1821                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1822                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
1823                         $wgOut->returnToMain( false, $return );
1824                         return;
1825                 }
1826
1827                 if( !empty($errors) ) {
1828                         $wgOut->showPermissionsErrorPage( $errors );
1829                         return;
1830                 }
1831
1832                 # Inform the user
1833                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1834                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
1835                 $wgOut->returnToMain( false, $return );
1836         }
1837
1838         /**
1839          * User-interface handler for the "watch" action
1840          */
1841
1842         public function watch() {
1843                 global $wgUser, $wgOut;
1844                 if( $wgUser->isAnon() ) {
1845                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1846                         return;
1847                 }
1848                 if( wfReadOnly() ) {
1849                         $wgOut->readOnlyPage();
1850                         return;
1851                 }
1852                 if( $this->doWatch() ) {
1853                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1854                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1855                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
1856                 }
1857                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1858         }
1859
1860         /**
1861          * Add this page to $wgUser's watchlist
1862          * @return bool true on successful watch operation
1863          */
1864         public function doWatch() {
1865                 global $wgUser;
1866                 if( $wgUser->isAnon() ) {
1867                         return false;
1868                 }
1869                 if( wfRunHooks('WatchArticle', array(&$wgUser, &$this)) ) {
1870                         $wgUser->addWatch( $this->mTitle );
1871                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1872                 }
1873                 return false;
1874         }
1875
1876         /**
1877          * User interface handler for the "unwatch" action.
1878          */
1879         public function unwatch() {
1880                 global $wgUser, $wgOut;
1881                 if( $wgUser->isAnon() ) {
1882                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1883                         return;
1884                 }
1885                 if( wfReadOnly() ) {
1886                         $wgOut->readOnlyPage();
1887                         return;
1888                 }
1889                 if( $this->doUnwatch() ) {
1890                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1891                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1892                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
1893                 }
1894                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1895         }
1896
1897         /**
1898          * Stop watching a page
1899          * @return bool true on successful unwatch
1900          */
1901         public function doUnwatch() {
1902                 global $wgUser;
1903                 if( $wgUser->isAnon() ) {
1904                         return false;
1905                 }
1906                 if( wfRunHooks('UnwatchArticle', array(&$wgUser, &$this)) ) {
1907                         $wgUser->removeWatch( $this->mTitle );
1908                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1909                 }
1910                 return false;
1911         }
1912
1913         /**
1914          * action=protect handler
1915          */
1916         public function protect() {
1917                 $form = new ProtectionForm( $this );
1918                 $form->execute();
1919         }
1920
1921         /**
1922          * action=unprotect handler (alias)
1923          */
1924         public function unprotect() {
1925                 $this->protect();
1926         }
1927
1928         /**
1929          * Update the article's restriction field, and leave a log entry.
1930          *
1931          * @param $limit Array: set of restriction keys
1932          * @param $reason String
1933          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1934          * @param $expiry Array: per restriction type expiration
1935          * @return bool true on success
1936          */
1937         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
1938                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1939
1940                 $id = $this->mTitle->getArticleID();
1941                 if( $id <= 0 || wfReadOnly() || !$this->mTitle->userCan('protect') ) {
1942                         return false;
1943                 }
1944
1945                 if( !$cascade ) {
1946                         $cascade = false;
1947                 }
1948
1949                 // Take this opportunity to purge out expired restrictions
1950                 Title::purgeExpiredRestrictions();
1951
1952                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1953                 # we expect a single selection, but the schema allows otherwise.
1954                 $current = array();
1955                 $updated = Article::flattenRestrictions( $limit );
1956                 $changed = false;
1957                 foreach( $wgRestrictionTypes as $action ) {
1958                         if( isset( $expiry[$action] ) ) {
1959                                 # Get current restrictions on $action
1960                                 $aLimits = $this->mTitle->getRestrictions( $action );
1961                                 $current[$action] = implode( '', $aLimits );
1962                                 # Are any actual restrictions being dealt with here?
1963                                 $aRChanged = count($aLimits) || !empty($limit[$action]);
1964                                 # If something changed, we need to log it. Checking $aRChanged
1965                                 # assures that "unprotecting" a page that is not protected does
1966                                 # not log just because the expiry was "changed".
1967                                 if( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
1968                                         $changed = true;
1969                                 }
1970                         }
1971                 }
1972
1973                 $current = Article::flattenRestrictions( $current );
1974
1975                 $changed = ($changed || $current != $updated );
1976                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
1977                 $protect = ( $updated != '' );
1978
1979                 # If nothing's changed, do nothing
1980                 if( $changed ) {
1981                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1982
1983                                 $dbw = wfGetDB( DB_MASTER );
1984
1985                                 # Prepare a null revision to be added to the history
1986                                 $modified = $current != '' && $protect;
1987                                 if( $protect ) {
1988                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1989                                 } else {
1990                                         $comment_type = 'unprotectedarticle';
1991                                 }
1992                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1993
1994                                 # Only restrictions with the 'protect' right can cascade...
1995                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1996                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1997                                 # The schema allows multiple restrictions
1998                                 if(!in_array('protect', $editrestriction) && !in_array('sysop', $editrestriction))
1999                                         $cascade = false;
2000                                 $cascade_description = '';
2001                                 if( $cascade ) {
2002                                         $cascade_description = ' ['.wfMsgForContent('protect-summary-cascade').']';
2003                                 }
2004
2005                                 if( $reason )
2006                                         $comment .= ": $reason";
2007
2008                                 $editComment = $comment;
2009                                 $encodedExpiry = array();
2010                                 $protect_description = '';
2011                                 foreach( $limit as $action => $restrictions  ) {
2012                                         $encodedExpiry[$action] = Block::encodeExpiry($expiry[$action], $dbw );
2013                                         if( $restrictions != '' ) {
2014                                                 $protect_description .= "[$action=$restrictions] (";
2015                                                 if( $encodedExpiry[$action] != 'infinity' ) {
2016                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2017                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2018                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2019                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2020                                                 } else {
2021                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2022                                                 }
2023                                                 $protect_description .= ') ';
2024                                         }
2025                                 }
2026                                 $protect_description = trim($protect_description);
2027
2028                                 if( $protect_description && $protect )
2029                                         $editComment .= " ($protect_description)";
2030                                 if( $cascade )
2031                                         $editComment .= "$cascade_description";
2032                                 # Update restrictions table
2033                                 foreach( $limit as $action => $restrictions ) {
2034                                         if($restrictions != '' ) {
2035                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
2036                                                         array( 'pr_page' => $id,
2037                                                                 'pr_type' => $action,
2038                                                                 'pr_level' => $restrictions,
2039                                                                 'pr_cascade' => ($cascade && $action == 'edit') ? 1 : 0,
2040                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
2041                                         } else {
2042                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2043                                                         'pr_type' => $action ), __METHOD__ );
2044                                         }
2045                                 }
2046
2047                                 # Insert a null revision
2048                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2049                                 $nullRevId = $nullRevision->insertOn( $dbw );
2050
2051                                 $latest = $this->getLatest();
2052                                 # Update page record
2053                                 $dbw->update( 'page',
2054                                         array( /* SET */
2055                                                 'page_touched' => $dbw->timestamp(),
2056                                                 'page_restrictions' => '',
2057                                                 'page_latest' => $nullRevId
2058                                         ), array( /* WHERE */
2059                                                 'page_id' => $id
2060                                         ), 'Article::protect'
2061                                 );
2062
2063                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $nullRevision, $latest, $wgUser) );
2064                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2065
2066                                 # Update the protection log
2067                                 $log = new LogPage( 'protect' );
2068                                 if( $protect ) {
2069                                         $params = array($protect_description,$cascade ? 'cascade' : '');
2070                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason), $params );
2071                                 } else {
2072                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2073                                 }
2074
2075                         } # End hook
2076                 } # End "changed" check
2077
2078                 return true;
2079         }
2080
2081         /**
2082          * Take an array of page restrictions and flatten it to a string
2083          * suitable for insertion into the page_restrictions field.
2084          * @param $limit Array
2085          * @return String
2086          */
2087         protected static function flattenRestrictions( $limit ) {
2088                 if( !is_array( $limit ) ) {
2089                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2090                 }
2091                 $bits = array();
2092                 ksort( $limit );
2093                 foreach( $limit as $action => $restrictions ) {
2094                         if( $restrictions != '' ) {
2095                                 $bits[] = "$action=$restrictions";
2096                         }
2097                 }
2098                 return implode( ':', $bits );
2099         }
2100
2101         /**
2102          * Auto-generates a deletion reason
2103          * @param &$hasHistory Boolean: whether the page has a history
2104          */
2105         public function generateReason( &$hasHistory ) {
2106                 global $wgContLang;
2107                 $dbw = wfGetDB( DB_MASTER );
2108                 // Get the last revision
2109                 $rev = Revision::newFromTitle( $this->mTitle );
2110                 if( is_null( $rev ) )
2111                         return false;
2112
2113                 // Get the article's contents
2114                 $contents = $rev->getText();
2115                 $blank = false;
2116                 // If the page is blank, use the text from the previous revision,
2117                 // which can only be blank if there's a move/import/protect dummy revision involved
2118                 if( $contents == '' ) {
2119                         $prev = $rev->getPrevious();
2120                         if( $prev )     {
2121                                 $contents = $prev->getText();
2122                                 $blank = true;
2123                         }
2124                 }
2125
2126                 // Find out if there was only one contributor
2127                 // Only scan the last 20 revisions
2128                 $limit = 20;
2129                 $res = $dbw->select( 'revision', 'rev_user_text',
2130                         array( 'rev_page' => $this->getID() ), __METHOD__,
2131                         array( 'LIMIT' => $limit )
2132                 );
2133                 if( $res === false )
2134                         // This page has no revisions, which is very weird
2135                         return false;
2136                 if( $res->numRows() > 1 )
2137                                 $hasHistory = true;
2138                 else
2139                                 $hasHistory = false;
2140                 $row = $dbw->fetchObject( $res );
2141                 $onlyAuthor = $row->rev_user_text;
2142                 // Try to find a second contributor
2143                 foreach( $res as $row ) {
2144                         if( $row->rev_user_text != $onlyAuthor ) {
2145                                 $onlyAuthor = false;
2146                                 break;
2147                         }
2148                 }
2149                 $dbw->freeResult( $res );
2150
2151                 // Generate the summary with a '$1' placeholder
2152                 if( $blank ) {
2153                         // The current revision is blank and the one before is also
2154                         // blank. It's just not our lucky day
2155                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2156                 } else {
2157                         if( $onlyAuthor )
2158                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2159                         else
2160                                 $reason = wfMsgForContent( 'excontent', '$1' );
2161                 }
2162
2163                 if( $reason == '-' ) {
2164                         // Allow these UI messages to be blanked out cleanly
2165                         return '';
2166                 }
2167
2168                 // Replace newlines with spaces to prevent uglyness
2169                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2170                 // Calculate the maximum amount of chars to get
2171                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2172                 $maxLength = 255 - (strlen( $reason ) - 2) - 3;
2173                 $contents = $wgContLang->truncate( $contents, $maxLength, '...' );
2174                 // Remove possible unfinished links
2175                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2176                 // Now replace the '$1' placeholder
2177                 $reason = str_replace( '$1', $contents, $reason );
2178                 return $reason;
2179         }
2180
2181
2182         /*
2183          * UI entry point for page deletion
2184          */
2185         public function delete() {
2186                 global $wgUser, $wgOut, $wgRequest;
2187
2188                 $confirm = $wgRequest->wasPosted() &&
2189                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2190
2191                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2192                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2193
2194                 $reason = $this->DeleteReasonList;
2195
2196                 if( $reason != 'other' && $this->DeleteReason != '' ) {
2197                         // Entry from drop down menu + additional comment
2198                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2199                 } elseif( $reason == 'other' ) {
2200                         $reason = $this->DeleteReason;
2201                 }
2202                 # Flag to hide all contents of the archived revisions
2203                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2204
2205                 # This code desperately needs to be totally rewritten
2206
2207                 # Read-only check...
2208                 if( wfReadOnly() ) {
2209                         $wgOut->readOnlyPage();
2210                         return;
2211                 }
2212
2213                 # Check permissions
2214                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2215
2216                 if( count( $permission_errors ) > 0 ) {
2217                         $wgOut->showPermissionsErrorPage( $permission_errors );
2218                         return;
2219                 }
2220
2221                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2222
2223                 # Better double-check that it hasn't been deleted yet!
2224                 $dbw = wfGetDB( DB_MASTER );
2225                 $conds = $this->mTitle->pageCond();
2226                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2227                 if( $latest === false ) {
2228                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2229                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2230                         LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2231                         return;
2232                 }
2233
2234                 # Hack for big sites
2235                 $bigHistory = $this->isBigDeletion();
2236                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2237                         global $wgLang, $wgDeleteRevisionsLimit;
2238                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2239                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2240                         return;
2241                 }
2242
2243                 if( $confirm ) {
2244                         $this->doDelete( $reason, $suppress );
2245                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2246                                 $this->doWatch();
2247                         } elseif( $this->mTitle->userIsWatching() ) {
2248                                 $this->doUnwatch();
2249                         }
2250                         return;
2251                 }
2252
2253                 // Generate deletion reason
2254                 $hasHistory = false;
2255                 if( !$reason ) $reason = $this->generateReason($hasHistory);
2256
2257                 // If the page has a history, insert a warning
2258                 if( $hasHistory && !$confirm ) {
2259                         $skin = $wgUser->getSkin();
2260                         $wgOut->addHTML( '<strong>' . wfMsgExt( 'historywarning', array( 'parseinline' ) ) . ' ' . $skin->historyLink() . '</strong>' );
2261                         if( $bigHistory ) {
2262                                 global $wgLang, $wgDeleteRevisionsLimit;
2263                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2264                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2265                         }
2266                 }
2267
2268                 return $this->confirmDelete( $reason );
2269         }
2270
2271         /**
2272          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2273          */
2274         public function isBigDeletion() {
2275                 global $wgDeleteRevisionsLimit;
2276                 if( $wgDeleteRevisionsLimit ) {
2277                         $revCount = $this->estimateRevisionCount();
2278                         return $revCount > $wgDeleteRevisionsLimit;
2279                 }
2280                 return false;
2281         }
2282
2283         /**
2284          * @return int approximate revision count
2285          */
2286         public function estimateRevisionCount() {
2287                 $dbr = wfGetDB( DB_SLAVE );
2288                 // For an exact count...
2289                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2290                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2291                 return $dbr->estimateRowCount( 'revision', '*',
2292                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2293         }
2294
2295         /**
2296          * Get the last N authors
2297          * @param $num Integer: number of revisions to get
2298          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2299          * @return array Array of authors, duplicates not removed
2300          */
2301         public function getLastNAuthors( $num, $revLatest = 0 ) {
2302                 wfProfileIn( __METHOD__ );
2303                 // First try the slave
2304                 // If that doesn't have the latest revision, try the master
2305                 $continue = 2;
2306                 $db = wfGetDB( DB_SLAVE );
2307                 do {
2308                         $res = $db->select( array( 'page', 'revision' ),
2309                                 array( 'rev_id', 'rev_user_text' ),
2310                                 array(
2311                                         'page_namespace' => $this->mTitle->getNamespace(),
2312                                         'page_title' => $this->mTitle->getDBkey(),
2313                                         'rev_page = page_id'
2314                                 ), __METHOD__, $this->getSelectOptions( array(
2315                                         'ORDER BY' => 'rev_timestamp DESC',
2316                                         'LIMIT' => $num
2317                                 ) )
2318                         );
2319                         if( !$res ) {
2320                                 wfProfileOut( __METHOD__ );
2321                                 return array();
2322                         }
2323                         $row = $db->fetchObject( $res );
2324                         if( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2325                                 $db = wfGetDB( DB_MASTER );
2326                                 $continue--;
2327                         } else {
2328                                 $continue = 0;
2329                         }
2330                 } while ( $continue );
2331
2332                 $authors = array( $row->rev_user_text );
2333                 while ( $row = $db->fetchObject( $res ) ) {
2334                         $authors[] = $row->rev_user_text;
2335                 }
2336                 wfProfileOut( __METHOD__ );
2337                 return $authors;
2338         }
2339
2340         /**
2341          * Output deletion confirmation dialog
2342          * @param $reason String: prefilled reason
2343          */
2344         public function confirmDelete( $reason ) {
2345                 global $wgOut, $wgUser;
2346
2347                 wfDebug( "Article::confirmDelete\n" );
2348
2349                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $wgUser->getSkin()->makeKnownLinkObj( $this->mTitle ) ) );
2350                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2351                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2352
2353                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
2354                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2355                                         <td></td>
2356                                         <td class='mw-input'>" .
2357                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2358                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2359                                         "</td>
2360                                 </tr>";
2361                 } else {
2362                         $suppress = '';
2363                 }
2364                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2365
2366                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2367                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2368                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2369                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2370                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2371                         "<tr id=\"wpDeleteReasonListRow\">
2372                                 <td class='mw-label'>" .
2373                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2374                                 "</td>
2375                                 <td class='mw-input'>" .
2376                                         Xml::listDropDown( 'wpDeleteReasonList',
2377                                                 wfMsgForContent( 'deletereason-dropdown' ),
2378                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2379                                 "</td>
2380                         </tr>
2381                         <tr id=\"wpDeleteReasonRow\">
2382                                 <td class='mw-label'>" .
2383                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2384                                 "</td>
2385                                 <td class='mw-input'>" .
2386                                         Xml::input( 'wpReason', 60, $reason, array( 'type' => 'text', 'maxlength' => '255',
2387                                                 'tabindex' => '2', 'id' => 'wpReason' ) ) .
2388                                 "</td>
2389                         </tr>
2390                         <tr>
2391                                 <td></td>
2392                                 <td class='mw-input'>" .
2393                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2394                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2395                                 "</td>
2396                         </tr>
2397                         $suppress
2398                         <tr>
2399                                 <td></td>
2400                                 <td class='mw-submit'>" .
2401                                         Xml::submitButton( wfMsg( 'deletepage' ),
2402                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2403                                 "</td>
2404                         </tr>" .
2405                         Xml::closeElement( 'table' ) .
2406                         Xml::closeElement( 'fieldset' ) .
2407                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2408                         Xml::closeElement( 'form' );
2409
2410                         if( $wgUser->isAllowed( 'editinterface' ) ) {
2411                                 $skin = $wgUser->getSkin();
2412                                 $link = $skin->makeLink ( 'MediaWiki:Deletereason-dropdown', wfMsgHtml( 'delete-edit-reasonlist' ) );
2413                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2414                         }
2415
2416                 $wgOut->addHTML( $form );
2417                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2418         }
2419
2420         /**
2421          * Perform a deletion and output success or failure messages
2422          */
2423         public function doDelete( $reason, $suppress = false ) {
2424                 global $wgOut, $wgUser;
2425                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2426
2427                 $error = '';
2428                 if( wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason, &$error)) ) {
2429                         if( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2430                                 $deleted = $this->mTitle->getPrefixedText();
2431
2432                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2433                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2434
2435                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2436
2437                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2438                                 $wgOut->returnToMain( false );
2439                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason, $id));
2440                         } else {
2441                                 if( $error == '' ) {
2442                                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2443                                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2444                                         LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2445                                 } else {
2446                                         $wgOut->showFatalError( $error );
2447                                 }
2448                         }
2449                 }
2450         }
2451
2452         /**
2453          * Back-end article deletion
2454          * Deletes the article with database consistency, writes logs, purges caches
2455          * Returns success
2456          */
2457         public function doDeleteArticle( $reason, $suppress = false, $id = 0 ) {
2458                 global $wgUseSquid, $wgDeferredUpdateList;
2459                 global $wgUseTrackbacks;
2460
2461                 wfDebug( __METHOD__."\n" );
2462
2463                 $dbw = wfGetDB( DB_MASTER );
2464                 $ns = $this->mTitle->getNamespace();
2465                 $t = $this->mTitle->getDBkey();
2466                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2467
2468                 if( $t == '' || $id == 0 ) {
2469                         return false;
2470                 }
2471
2472                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getRawText() ), -1 );
2473                 array_push( $wgDeferredUpdateList, $u );
2474
2475                 // Bitfields to further suppress the content
2476                 if( $suppress ) {
2477                         $bitfield = 0;
2478                         // This should be 15...
2479                         $bitfield |= Revision::DELETED_TEXT;
2480                         $bitfield |= Revision::DELETED_COMMENT;
2481                         $bitfield |= Revision::DELETED_USER;
2482                         $bitfield |= Revision::DELETED_RESTRICTED;
2483                 } else {
2484                         $bitfield = 'rev_deleted';
2485                 }
2486
2487                 $dbw->begin();
2488                 // For now, shunt the revision data into the archive table.
2489                 // Text is *not* removed from the text table; bulk storage
2490                 // is left intact to avoid breaking block-compression or
2491                 // immutable storage schemes.
2492                 //
2493                 // For backwards compatibility, note that some older archive
2494                 // table entries will have ar_text and ar_flags fields still.
2495                 //
2496                 // In the future, we may keep revisions and mark them with
2497                 // the rev_deleted field, which is reserved for this purpose.
2498                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2499                         array(
2500                                 'ar_namespace'  => 'page_namespace',
2501                                 'ar_title'      => 'page_title',
2502                                 'ar_comment'    => 'rev_comment',
2503                                 'ar_user'       => 'rev_user',
2504                                 'ar_user_text'  => 'rev_user_text',
2505                                 'ar_timestamp'  => 'rev_timestamp',
2506                                 'ar_minor_edit' => 'rev_minor_edit',
2507                                 'ar_rev_id'     => 'rev_id',
2508                                 'ar_text_id'    => 'rev_text_id',
2509                                 'ar_text'       => '\'\'', // Be explicit to appease
2510                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2511                                 'ar_len'        => 'rev_len',
2512                                 'ar_page_id'    => 'page_id',
2513                                 'ar_deleted'    => $bitfield
2514                         ), array(
2515                                 'page_id' => $id,
2516                                 'page_id = rev_page'
2517                         ), __METHOD__
2518                 );
2519
2520                 # Delete restrictions for it
2521                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2522
2523                 # Now that it's safely backed up, delete it
2524                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2525                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2526                 if( !$ok ) {
2527                         $dbw->rollback();
2528                         return false;
2529                 }
2530
2531                 # If using cascading deletes, we can skip some explicit deletes
2532                 if( !$dbw->cascadingDeletes() ) {
2533                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2534
2535                         if($wgUseTrackbacks)
2536                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2537
2538                         # Delete outgoing links
2539                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2540                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2541                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2542                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2543                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2544                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2545                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2546                 }
2547
2548                 # If using cleanup triggers, we can skip some manual deletes
2549                 if( !$dbw->cleanupTriggers() ) {
2550                         # Clean up recentchanges entries...
2551                         $dbw->delete( 'recentchanges',
2552                                 array( 'rc_type != '.RC_LOG,
2553                                         'rc_namespace' => $this->mTitle->getNamespace(),
2554                                         'rc_title' => $this->mTitle->getDBKey() ),
2555                                 __METHOD__ );
2556                         $dbw->delete( 'recentchanges',
2557                                 array( 'rc_type != '.RC_LOG, 'rc_cur_id' => $id ),
2558                                 __METHOD__ );
2559                 }
2560
2561                 # Clear caches
2562                 Article::onArticleDelete( $this->mTitle );
2563
2564                 # Fix category table counts
2565                 $cats = array();
2566                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2567                 foreach( $res as $row ) {
2568                         $cats []= $row->cl_to;
2569                 }
2570                 $this->updateCategoryCounts( array(), $cats );
2571
2572                 # Clear the cached article id so the interface doesn't act like we exist
2573                 $this->mTitle->resetArticleID( 0 );
2574                 $this->mTitle->mArticleID = 0;
2575
2576                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2577                 $logtype = $suppress ? 'suppress' : 'delete';
2578                 $log = new LogPage( $logtype );
2579
2580                 # Make sure logging got through
2581                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2582
2583                 $dbw->commit();
2584
2585                 return true;
2586         }
2587
2588         /**
2589          * Roll back the most recent consecutive set of edits to a page
2590          * from the same user; fails if there are no eligible edits to
2591          * roll back to, e.g. user is the sole contributor. This function
2592          * performs permissions checks on $wgUser, then calls commitRollback()
2593          * to do the dirty work
2594          *
2595          * @param $fromP String: Name of the user whose edits to rollback.
2596          * @param $summary String: Custom summary. Set to default summary if empty.
2597          * @param $token String: Rollback token.
2598          * @param $bot Boolean: If true, mark all reverted edits as bot.
2599          *
2600          * @param $resultDetails Array: contains result-specific array of additional values
2601          *    'alreadyrolled' : 'current' (rev)
2602          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2603          *
2604          * @return array of errors, each error formatted as
2605          *   array(messagekey, param1, param2, ...).
2606          * On success, the array is empty.  This array can also be passed to
2607          * OutputPage::showPermissionsErrorPage().
2608          */
2609         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2610                 global $wgUser;
2611                 $resultDetails = null;
2612
2613                 # Check permissions
2614                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
2615                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
2616                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2617
2618                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2619                         $errors[] = array( 'sessionfailure' );
2620
2621                 if( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
2622                         $errors[] = array( 'actionthrottledtext' );
2623                 }
2624                 # If there were errors, bail out now
2625                 if( !empty( $errors ) )
2626                         return $errors;
2627
2628                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
2629         }
2630
2631         /**
2632          * Backend implementation of doRollback(), please refer there for parameter
2633          * and return value documentation
2634          *
2635          * NOTE: This function does NOT check ANY permissions, it just commits the
2636          * rollback to the DB Therefore, you should only call this function direct-
2637          * ly if you want to use custom permissions checks. If you don't, use
2638          * doRollback() instead.
2639          */
2640         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
2641                 global $wgUseRCPatrol, $wgUser, $wgLang;
2642                 $dbw = wfGetDB( DB_MASTER );
2643
2644                 if( wfReadOnly() ) {
2645                         return array( array( 'readonlytext' ) );
2646                 }
2647
2648                 # Get the last editor
2649                 $current = Revision::newFromTitle( $this->mTitle );
2650                 if( is_null( $current ) ) {
2651                         # Something wrong... no page?
2652                         return array(array('notanarticle'));
2653                 }
2654
2655                 $from = str_replace( '_', ' ', $fromP );
2656                 if( $from != $current->getUserText() ) {
2657                         $resultDetails = array( 'current' => $current );
2658                         return array(array('alreadyrolled',
2659                                 htmlspecialchars($this->mTitle->getPrefixedText()),
2660                                 htmlspecialchars($fromP),
2661                                 htmlspecialchars($current->getUserText())
2662                         ));
2663                 }
2664
2665                 # Get the last edit not by this guy
2666                 $user = intval( $current->getUser() );
2667                 $user_text = $dbw->addQuotes( $current->getUserText() );
2668                 $s = $dbw->selectRow( 'revision',
2669                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2670                         array(  'rev_page' => $current->getPage(),
2671                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2672                         ), __METHOD__,
2673                         array(  'USE INDEX' => 'page_timestamp',
2674                                 'ORDER BY'  => 'rev_timestamp DESC' )
2675                         );
2676                 if( $s === false ) {
2677                         # No one else ever edited this page
2678                         return array(array('cantrollback'));
2679                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
2680                         # Only admins can see this text
2681                         return array(array('notvisiblerev'));
2682                 }
2683
2684                 $set = array();
2685                 if( $bot && $wgUser->isAllowed('markbotedits') ) {
2686                         # Mark all reverted edits as bot
2687                         $set['rc_bot'] = 1;
2688                 }
2689                 if( $wgUseRCPatrol ) {
2690                         # Mark all reverted edits as patrolled
2691                         $set['rc_patrolled'] = 1;
2692                 }
2693
2694                 if( $set ) {
2695                         $dbw->update( 'recentchanges', $set,
2696                                         array( /* WHERE */
2697                                                 'rc_cur_id' => $current->getPage(),
2698                                                 'rc_user_text' => $current->getUserText(),
2699                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2700                                         ), __METHOD__
2701                                 );
2702                 }
2703
2704                 # Generate the edit summary if necessary
2705                 $target = Revision::newFromId( $s->rev_id );
2706                 if( empty( $summary ) ){
2707                         $summary = wfMsgForContent( 'revertpage' );
2708                 }
2709
2710                 # Allow the custom summary to use the same args as the default message
2711                 $args = array(
2712                         $target->getUserText(), $from, $s->rev_id,
2713                         $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
2714                         $current->getId(), $wgLang->timeanddate($current->getTimestamp())
2715                 );
2716                 $summary = wfMsgReplaceArgs( $summary, $args );
2717
2718                 # Save
2719                 $flags = EDIT_UPDATE;
2720
2721                 if( $wgUser->isAllowed('minoredit') )
2722                         $flags |= EDIT_MINOR;
2723
2724                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
2725                         $flags |= EDIT_FORCE_BOT;
2726                 # Actually store the edit
2727                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
2728                 if( !empty( $status->value['revision'] ) ) {
2729                         $revId = $status->value['revision']->getId();
2730                 } else {
2731                         $revId = false;
2732                 }
2733
2734                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
2735
2736                 $resultDetails = array(
2737                         'summary' => $summary,
2738                         'current' => $current,
2739                         'target' => $target,
2740                         'newid' => $revId
2741                 );
2742                 return array();
2743         }
2744
2745         /**
2746          * User interface for rollback operations
2747          */
2748         public function rollback() {
2749                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2750                 $details = null;
2751
2752                 $result = $this->doRollback(
2753                         $wgRequest->getVal( 'from' ),
2754                         $wgRequest->getText( 'summary' ),
2755                         $wgRequest->getVal( 'token' ),
2756                         $wgRequest->getBool( 'bot' ),
2757                         $details
2758                 );
2759
2760                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
2761                         $wgOut->rateLimited();
2762                         return;
2763                 }
2764                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
2765                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2766                         $errArray = $result[0];
2767                         $errMsg = array_shift( $errArray );
2768                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
2769                         if( isset( $details['current'] ) ){
2770                                 $current = $details['current'];
2771                                 if( $current->getComment() != '' ) {
2772                                         $wgOut->addWikiMsgArray( 'editcomment', array(
2773                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
2774                                 }
2775                         }
2776                         return;
2777                 }
2778                 # Display permissions errors before read-only message -- there's no
2779                 # point in misleading the user into thinking the inability to rollback
2780                 # is only temporary.
2781                 if( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
2782                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
2783                         # move any 'readonlytext' error manually.
2784                         $out = array();
2785                         foreach( $result as $error ) {
2786                                 if( $error != array( 'readonlytext' ) ) {
2787                                         $out []= $error;
2788                                 }
2789                         }
2790                         $wgOut->showPermissionsErrorPage( $out );
2791                         return;
2792                 }
2793                 if( $result == array( array( 'readonlytext' ) ) ) {
2794                         $wgOut->readOnlyPage();
2795                         return;
2796                 }
2797
2798                 $current = $details['current'];
2799                 $target = $details['target'];
2800                 $newId = $details['newid'];
2801                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2802                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2803                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2804                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2805                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2806                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2807                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2808                 $wgOut->returnToMain( false, $this->mTitle );
2809
2810                 if( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
2811                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
2812                         $de->showDiff( '', '' );
2813                 }
2814         }
2815
2816
2817         /**
2818          * Do standard deferred updates after page view
2819          */
2820         public function viewUpdates() {
2821                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
2822                 # Don't update page view counters on views from bot users (bug 14044)
2823                 if( !$wgDisableCounters && !$wgUser->isAllowed('bot') && $this->getID() ) {
2824                         Article::incViewCount( $this->getID() );
2825                         $u = new SiteStatsUpdate( 1, 0, 0 );
2826                         array_push( $wgDeferredUpdateList, $u );
2827                 }
2828                 # Update newtalk / watchlist notification status
2829                 $wgUser->clearNotification( $this->mTitle );
2830         }
2831
2832         /**
2833          * Prepare text which is about to be saved.
2834          * Returns a stdclass with source, pst and output members
2835          */
2836         public function prepareTextForEdit( $text, $revid=null ) {
2837                 if( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
2838                         // Already prepared
2839                         return $this->mPreparedEdit;
2840                 }
2841                 global $wgParser;
2842                 $edit = (object)array();
2843                 $edit->revid = $revid;
2844                 $edit->newText = $text;
2845                 $edit->pst = $this->preSaveTransform( $text );
2846                 $options = new ParserOptions;
2847                 $options->setTidy( true );
2848                 $options->enableLimitReport();
2849                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
2850                 $edit->oldText = $this->getContent();
2851                 $this->mPreparedEdit = $edit;
2852                 return $edit;
2853         }
2854
2855         /**
2856          * Do standard deferred updates after page edit.
2857          * Update links tables, site stats, search index and message cache.
2858          * Purges pages that include this page if the text was changed here.
2859          * Every 100th edit, prune the recent changes table.
2860          *
2861          * @private
2862          * @param $text New text of the article
2863          * @param $summary Edit summary
2864          * @param $minoredit Minor edit
2865          * @param $timestamp_of_pagechange Timestamp associated with the page change
2866          * @param $newid rev_id value of the new revision
2867          * @param $changed Whether or not the content actually changed
2868          */
2869         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2870                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
2871
2872                 wfProfileIn( __METHOD__ );
2873
2874                 # Parse the text
2875                 # Be careful not to double-PST: $text is usually already PST-ed once
2876                 if( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2877                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2878                         $editInfo = $this->prepareTextForEdit( $text, $newid );
2879                 } else {
2880                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2881                         $editInfo = $this->mPreparedEdit;
2882                 }
2883
2884                 # Save it to the parser cache
2885                 if( $wgEnableParserCache ) {
2886                         $parserCache = ParserCache::singleton();
2887                         $parserCache->save( $editInfo->output, $this, $wgUser );
2888                 }
2889
2890                 # Update the links tables
2891                 $u = new LinksUpdate( $this->mTitle, $editInfo->output, false );
2892                 $u->setRecursiveTouch( $changed ); // refresh/invalidate including pages too
2893                 $u->doUpdate();
2894
2895                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
2896
2897                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2898                         if( 0 == mt_rand( 0, 99 ) ) {
2899                                 // Flush old entries from the `recentchanges` table; we do this on
2900                                 // random requests so as to avoid an increase in writes for no good reason
2901                                 global $wgRCMaxAge;
2902                                 $dbw = wfGetDB( DB_MASTER );
2903                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2904                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2905                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2906                                 $dbw->query( $sql );
2907                         }
2908                 }
2909
2910                 $id = $this->getID();
2911                 $title = $this->mTitle->getPrefixedDBkey();
2912                 $shortTitle = $this->mTitle->getDBkey();
2913
2914                 if( 0 == $id ) {
2915                         wfProfileOut( __METHOD__ );
2916                         return;
2917                 }
2918
2919                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2920                 array_push( $wgDeferredUpdateList, $u );
2921                 $u = new SearchUpdate( $id, $title, $text );
2922                 array_push( $wgDeferredUpdateList, $u );
2923
2924                 # If this is another user's talk page, update newtalk
2925                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2926                 # load of user talk pages and piss people off, nor if it's a minor edit
2927                 # by a properly-flagged bot.
2928                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2929                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
2930                         if( wfRunHooks('ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2931                                 $other = User::newFromName( $shortTitle, false );
2932                                 if( !$other ) {
2933                                         wfDebug( __METHOD__.": invalid username\n" );
2934                                 } elseif( User::isIP( $shortTitle ) ) {
2935                                         // An anonymous user
2936                                         $other->setNewtalk( true );
2937                                 } elseif( $other->isLoggedIn() ) {
2938                                         $other->setNewtalk( true );
2939                                 } else {
2940                                         wfDebug( __METHOD__. ": don't need to notify a nonexistent user\n" );
2941                                 }
2942                         }
2943                 }
2944
2945                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2946                         $wgMessageCache->replace( $shortTitle, $text );
2947                 }
2948
2949                 wfProfileOut( __METHOD__ );
2950         }
2951
2952         /**
2953          * Perform article updates on a special page creation.
2954          *
2955          * @param $rev Revision object
2956          *
2957          * @todo This is a shitty interface function. Kill it and replace the
2958          * other shitty functions like editUpdates and such so it's not needed
2959          * anymore.
2960          */
2961         public function createUpdates( $rev ) {
2962                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2963                 $this->mTotalAdjustment = 1;
2964                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2965                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2966         }
2967
2968         /**
2969          * Generate the navigation links when browsing through an article revisions
2970          * It shows the information as:
2971          *   Revision as of \<date\>; view current revision
2972          *   \<- Previous version | Next Version -\>
2973          *
2974          * @param $oldid String: revision ID of this article revision
2975          */
2976         public function setOldSubtitle( $oldid = 0 ) {
2977                 global $wgLang, $wgOut, $wgUser, $wgRequest;
2978
2979                 if( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
2980                         return;
2981                 }
2982
2983                 $revision = Revision::newFromId( $oldid );
2984
2985                 $current = ( $oldid == $this->mLatest );
2986                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2987                 $sk = $wgUser->getSkin();
2988                 $lnk = $current
2989                         ? wfMsgHtml( 'currentrevisionlink' )
2990                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'currentrevisionlink' ) );
2991                 $curdiff = $current
2992                         ? wfMsgHtml( 'diff' )
2993                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=cur&oldid='.$oldid );
2994                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2995                 $prevlink = $prev
2996                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2997                         : wfMsgHtml( 'previousrevision' );
2998                 $prevdiff = $prev
2999                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=prev&oldid='.$oldid )
3000                         : wfMsgHtml( 'diff' );
3001                 $nextlink = $current
3002                         ? wfMsgHtml( 'nextrevision' )
3003                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'nextrevision' ), 'direction=next&oldid='.$oldid );
3004                 $nextdiff = $current
3005                         ? wfMsgHtml( 'diff' )
3006                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=next&oldid='.$oldid );
3007
3008                 $cdel='';
3009                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
3010                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
3011                         if( $revision->isCurrent() ) {
3012                         // We don't handle top deleted edits too well
3013                                 $cdel = wfMsgHtml( 'rev-delundel' );
3014                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3015                         // If revision was hidden from sysops
3016                                 $cdel = wfMsgHtml( 'rev-delundel' );
3017                         } else {
3018                                 $cdel = $sk->makeKnownLinkObj( $revdel,
3019                                         wfMsgHtml('rev-delundel'),
3020                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
3021                                         '&oldid=' . urlencode( $oldid ) );
3022                                 // Bolden oversighted content
3023                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
3024                                         $cdel = "<strong>$cdel</strong>";
3025                         }
3026                         $cdel = "(<small>$cdel</small>) ";
3027                 }
3028                 $unhide = $wgRequest->getInt('unhide') == 1 && $wgUser->matchEditToken( $wgRequest->getVal('token'), $oldid );
3029                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3030                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3031
3032                 $m = wfMsg( 'revision-info-current' );
3033                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3034                         ? 'revision-info-current'
3035                         : 'revision-info';
3036
3037                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsgExt( $infomsg, array( 'parseinline', 'replaceafter' ),
3038                         $td, $userlinks, $revision->getID() ) . "</div>\n" .
3039
3040                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3041                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3042                 $wgOut->setSubtitle( $r );
3043         }
3044
3045         /**
3046          * This function is called right before saving the wikitext,
3047          * so we can do things like signatures and links-in-context.
3048          *
3049          * @param $text String
3050          */
3051         public function preSaveTransform( $text ) {
3052                 global $wgParser, $wgUser;
3053                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3054         }
3055
3056         /* Caching functions */
3057
3058         /**
3059          * checkLastModified returns true if it has taken care of all
3060          * output to the client that is necessary for this request.
3061          * (that is, it has sent a cached version of the page)
3062          */
3063         protected function tryFileCache() {
3064                 static $called = false;
3065                 if( $called ) {
3066                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3067                         return false;
3068                 }
3069                 $called = true;
3070                 if( $this->isFileCacheable() ) {
3071                         $cache = new HTMLFileCache( $this->mTitle );
3072                         if( $cache->isFileCacheGood( $this->mTouched ) ) {
3073                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3074                                 $cache->loadFromFileCache();
3075                                 return true;
3076                         } else {
3077                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3078                                 ob_start( array(&$cache, 'saveToFileCache' ) );
3079                         }
3080                 } else {
3081                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3082                 }
3083                 return false;
3084         }
3085
3086         /**
3087          * Check if the page can be cached
3088          * @return bool
3089          */
3090         public function isFileCacheable() {
3091                 $cacheable = false;
3092                 if( HTMLFileCache::useFileCache() ) {
3093                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3094                         // Extension may have reason to disable file caching on some pages.
3095                         if( $cacheable ) {
3096                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3097                         }
3098                 }
3099                 return $cacheable;
3100         }
3101
3102         /**
3103          * Loads page_touched and returns a value indicating if it should be used
3104          *
3105          */
3106         public function checkTouched() {
3107                 if( !$this->mDataLoaded ) {
3108                         $this->loadPageData();
3109                 }
3110                 return !$this->mIsRedirect;
3111         }
3112
3113         /**
3114          * Get the page_touched field
3115          */
3116         public function getTouched() {
3117                 # Ensure that page data has been loaded
3118                 if( !$this->mDataLoaded ) {
3119                         $this->loadPageData();
3120                 }
3121                 return $this->mTouched;
3122         }
3123
3124         /**
3125          * Get the page_latest field
3126          */
3127         public function getLatest() {
3128                 if( !$this->mDataLoaded ) {
3129                         $this->loadPageData();
3130                 }
3131                 return $this->mLatest;
3132         }
3133
3134         /**
3135          * Edit an article without doing all that other stuff
3136          * The article must already exist; link tables etc
3137          * are not updated, caches are not flushed.
3138          *
3139          * @param $text String: text submitted
3140          * @param $comment String: comment submitted
3141          * @param $minor Boolean: whereas it's a minor modification
3142          */
3143         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3144                 wfProfileIn( __METHOD__ );
3145
3146                 $dbw = wfGetDB( DB_MASTER );
3147                 $revision = new Revision( array(
3148                         'page'       => $this->getId(),
3149                         'text'       => $text,
3150                         'comment'    => $comment,
3151                         'minor_edit' => $minor ? 1 : 0,
3152                         ) );
3153                 $revision->insertOn( $dbw );
3154                 $this->updateRevisionOn( $dbw, $revision );
3155
3156                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $wgUser) );
3157
3158                 wfProfileOut( __METHOD__ );
3159         }
3160
3161         /**
3162          * Used to increment the view counter
3163          *
3164          * @param $id Integer: article id
3165          */
3166         public static function incViewCount( $id ) {
3167                 $id = intval( $id );
3168                 global $wgHitcounterUpdateFreq, $wgDBtype;
3169
3170                 $dbw = wfGetDB( DB_MASTER );
3171                 $pageTable = $dbw->tableName( 'page' );
3172                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3173                 $acchitsTable = $dbw->tableName( 'acchits' );
3174
3175                 if( $wgHitcounterUpdateFreq <= 1 ) {
3176                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3177                         return;
3178                 }
3179
3180                 # Not important enough to warrant an error page in case of failure
3181                 $oldignore = $dbw->ignoreErrors( true );
3182
3183                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3184
3185                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
3186                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
3187                         # Most of the time (or on SQL errors), skip row count check
3188                         $dbw->ignoreErrors( $oldignore );
3189                         return;
3190                 }
3191
3192                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
3193                 $row = $dbw->fetchObject( $res );
3194                 $rown = intval( $row->n );
3195                 if( $rown >= $wgHitcounterUpdateFreq ){
3196                         wfProfileIn( 'Article::incViewCount-collect' );
3197                         $old_user_abort = ignore_user_abort( true );
3198
3199                         if($wgDBtype == 'mysql')
3200                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
3201                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
3202                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
3203                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
3204                                 'GROUP BY hc_id');
3205                         $dbw->query("DELETE FROM $hitcounterTable");
3206                         if($wgDBtype == 'mysql') {
3207                                 $dbw->query('UNLOCK TABLES');
3208                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3209                                         'WHERE page_id = hc_id');
3210                         }
3211                         else {
3212                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3213                                         "FROM $acchitsTable WHERE page_id = hc_id");
3214                         }
3215                         $dbw->query("DROP TABLE $acchitsTable");
3216
3217                         ignore_user_abort( $old_user_abort );
3218                         wfProfileOut( 'Article::incViewCount-collect' );
3219                 }
3220                 $dbw->ignoreErrors( $oldignore );
3221         }
3222
3223         /**#@+
3224          * The onArticle*() functions are supposed to be a kind of hooks
3225          * which should be called whenever any of the specified actions
3226          * are done.
3227          *
3228          * This is a good place to put code to clear caches, for instance.
3229          *
3230          * This is called on page move and undelete, as well as edit
3231          *
3232          * @param $title a title object
3233          */
3234
3235         public static function onArticleCreate( $title ) {
3236                 # Update existence markers on article/talk tabs...
3237                 if( $title->isTalkPage() ) {
3238                         $other = $title->getSubjectPage();
3239                 } else {
3240                         $other = $title->getTalkPage();
3241                 }
3242                 $other->invalidateCache();
3243                 $other->purgeSquid();
3244
3245                 $title->touchLinks();
3246                 $title->purgeSquid();
3247                 $title->deleteTitleProtection();
3248         }
3249
3250         public static function onArticleDelete( $title ) {
3251                 global $wgMessageCache;
3252                 # Update existence markers on article/talk tabs...
3253                 if( $title->isTalkPage() ) {
3254                         $other = $title->getSubjectPage();
3255                 } else {
3256                         $other = $title->getTalkPage();
3257                 }
3258                 $other->invalidateCache();
3259                 $other->purgeSquid();
3260
3261                 $title->touchLinks();
3262                 $title->purgeSquid();
3263
3264                 # File cache
3265                 HTMLFileCache::clearFileCache( $title );
3266
3267                 # Messages
3268                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
3269                         $wgMessageCache->replace( $title->getDBkey(), false );
3270                 }
3271                 # Images
3272                 if( $title->getNamespace() == NS_FILE ) {
3273                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3274                         $update->doUpdate();
3275                 }
3276                 # User talk pages
3277                 if( $title->getNamespace() == NS_USER_TALK ) {
3278                         $user = User::newFromName( $title->getText(), false );
3279                         $user->setNewtalk( false );
3280                 }
3281         }
3282
3283         /**
3284          * Purge caches on page update etc
3285          */
3286         public static function onArticleEdit( $title, $transclusions = 'transclusions' ) {
3287                 global $wgDeferredUpdateList;
3288
3289                 // Invalidate caches of articles which include this page
3290                 if( $transclusions !== 'skiptransclusions' )
3291                         $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3292
3293                 // Invalidate the caches of all pages which redirect here
3294                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3295
3296                 # Purge squid for this page only
3297                 $title->purgeSquid();
3298
3299                 # Clear file cache for this page only
3300                 HTMLFileCache::clearFileCache( $title );
3301         }
3302
3303         /**#@-*/
3304
3305         /**
3306          * Overriden by ImagePage class, only present here to avoid a fatal error
3307          * Called for ?action=revert
3308          */
3309         public function revert() {
3310                 global $wgOut;
3311                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3312         }
3313
3314         /**
3315          * Info about this page
3316          * Called for ?action=info when $wgAllowPageInfo is on.
3317          */
3318         public function info() {
3319                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3320
3321                 if( !$wgAllowPageInfo ) {
3322                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3323                         return;
3324                 }
3325
3326                 $page = $this->mTitle->getSubjectPage();
3327
3328                 $wgOut->setPagetitle( $page->getPrefixedText() );
3329                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3330                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3331
3332                 if( !$this->mTitle->exists() ) {
3333                         $wgOut->addHTML( '<div class="noarticletext">' );
3334                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3335                                 // This doesn't quite make sense; the user is asking for
3336                                 // information about the _page_, not the message... -- RC
3337                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3338                         } else {
3339                                 $msg = $wgUser->isLoggedIn()
3340                                         ? 'noarticletext'
3341                                         : 'noarticletextanon';
3342                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3343                         }
3344                         $wgOut->addHTML( '</div>' );
3345                 } else {
3346                         $dbr = wfGetDB( DB_SLAVE );
3347                         $wl_clause = array(
3348                                 'wl_title'     => $page->getDBkey(),
3349                                 'wl_namespace' => $page->getNamespace() );
3350                         $numwatchers = $dbr->selectField(
3351                                 'watchlist',
3352                                 'COUNT(*)',
3353                                 $wl_clause,
3354                                 __METHOD__,
3355                                 $this->getSelectOptions() );
3356
3357                         $pageInfo = $this->pageCountInfo( $page );
3358                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3359
3360                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3361                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3362                         if( $talkInfo ) {
3363                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3364                         }
3365                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3366                         if( $talkInfo ) {
3367                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3368                         }
3369                         $wgOut->addHTML( '</ul>' );
3370                 }
3371         }
3372
3373         /**
3374          * Return the total number of edits and number of unique editors
3375          * on a given page. If page does not exist, returns false.
3376          *
3377          * @param $title Title object
3378          * @return array
3379          */
3380         protected function pageCountInfo( $title ) {
3381                 $id = $title->getArticleId();
3382                 if( $id == 0 ) {
3383                         return false;
3384                 }
3385                 $dbr = wfGetDB( DB_SLAVE );
3386                 $rev_clause = array( 'rev_page' => $id );
3387                 $edits = $dbr->selectField(
3388                         'revision',
3389                         'COUNT(rev_page)',
3390                         $rev_clause,
3391                         __METHOD__,
3392                         $this->getSelectOptions()
3393                 );
3394                 $authors = $dbr->selectField(
3395                         'revision',
3396                         'COUNT(DISTINCT rev_user_text)',
3397                         $rev_clause,
3398                         __METHOD__,
3399                         $this->getSelectOptions()
3400                 );
3401                 return array( 'edits' => $edits, 'authors' => $authors );
3402         }
3403
3404         /**
3405          * Return a list of templates used by this article.
3406          * Uses the templatelinks table
3407          *
3408          * @return Array of Title objects
3409          */
3410         public function getUsedTemplates() {
3411                 $result = array();
3412                 $id = $this->mTitle->getArticleID();
3413                 if( $id == 0 ) {
3414                         return array();
3415                 }
3416                 $dbr = wfGetDB( DB_SLAVE );
3417                 $res = $dbr->select( array( 'templatelinks' ),
3418                         array( 'tl_namespace', 'tl_title' ),
3419                         array( 'tl_from' => $id ),
3420                         __METHOD__ );
3421                 if( $res !== false ) {
3422                         foreach( $res as $row ) {
3423                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3424                         }
3425                 }
3426                 $dbr->freeResult( $res );
3427                 return $result;
3428         }
3429
3430         /**
3431          * Returns a list of hidden categories this page is a member of.
3432          * Uses the page_props and categorylinks tables.
3433          *
3434          * @return Array of Title objects
3435          */
3436         public function getHiddenCategories() {
3437                 $result = array();
3438                 $id = $this->mTitle->getArticleID();
3439                 if( $id == 0 ) {
3440                         return array();
3441                 }
3442                 $dbr = wfGetDB( DB_SLAVE );
3443                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3444                         array( 'cl_to' ),
3445                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3446                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3447                         __METHOD__ );
3448                 if( $res !== false ) {
3449                         foreach( $res as $row ) {
3450                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3451                         }
3452                 }
3453                 $dbr->freeResult( $res );
3454                 return $result;
3455         }
3456
3457         /**
3458         * Return an applicable autosummary if one exists for the given edit.
3459         * @param $oldtext String: the previous text of the page.
3460         * @param $newtext String: The submitted text of the page.
3461         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
3462         * @return string An appropriate autosummary, or an empty string.
3463         */
3464         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3465                 # Decide what kind of autosummary is needed.
3466
3467                 # Redirect autosummaries
3468                 $ot = Title::newFromRedirect( $oldtext );
3469                 $rt = Title::newFromRedirect( $newtext );
3470                 if( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
3471                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3472                 }
3473
3474                 # New page autosummaries
3475                 if( $flags & EDIT_NEW && strlen( $newtext ) ) {
3476                         # If they're making a new article, give its text, truncated, in the summary.
3477                         global $wgContLang;
3478                         $truncatedtext = $wgContLang->truncate(
3479                                 str_replace("\n", ' ', $newtext),
3480                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ),
3481                                 '...' );
3482                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3483                 }
3484
3485                 # Blanking autosummaries
3486                 if( $oldtext != '' && $newtext == '' ) {
3487                         return wfMsgForContent( 'autosumm-blank' );
3488                 } elseif( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500) {
3489                         # Removing more than 90% of the article
3490                         global $wgContLang;
3491                         $truncatedtext = $wgContLang->truncate(
3492                                 $newtext,
3493                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ),
3494                                 '...'
3495                         );
3496                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3497                 }
3498
3499                 # If we reach this point, there's no applicable autosummary for our case, so our
3500                 # autosummary is empty.
3501                 return '';
3502         }
3503
3504         /**
3505          * Add the primary page-view wikitext to the output buffer
3506          * Saves the text into the parser cache if possible.
3507          * Updates templatelinks if it is out of date.
3508          *
3509          * @param $text String
3510          * @param $cache Boolean
3511          */
3512         public function outputWikiText( $text, $cache = true ) {
3513                 global $wgParser, $wgUser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
3514
3515                 $popts = $wgOut->parserOptions();
3516                 $popts->setTidy(true);
3517                 $popts->enableLimitReport();
3518                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3519                         $popts, true, true, $this->getRevIdFetched() );
3520                 $popts->setTidy(false);
3521                 $popts->enableLimitReport( false );
3522                 if( $wgEnableParserCache && $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3523                         $parserCache = ParserCache::singleton();
3524                         $parserCache->save( $parserOutput, $this, $wgUser );
3525                 }
3526                 // Make sure file cache is not used on uncacheable content.
3527                 // Output that has magic words in it can still use the parser cache
3528                 // (if enabled), though it will generally expire sooner.
3529                 if( $parserOutput->getCacheTime() == -1 || $parserOutput->containsOldMagic() ) {
3530                         $wgUseFileCache = false;
3531                 }
3532
3533                 if( $this->isCurrent() && !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3534                         // templatelinks table may have become out of sync,
3535                         // especially if using variable-based transclusions.
3536                         // For paranoia, check if things have changed and if
3537                         // so apply updates to the database. This will ensure
3538                         // that cascaded protections apply as soon as the changes
3539                         // are visible.
3540
3541                         # Get templates from templatelinks
3542                         $id = $this->mTitle->getArticleID();
3543
3544                         $tlTemplates = array();
3545
3546                         $dbr = wfGetDB( DB_SLAVE );
3547                         $res = $dbr->select( array( 'templatelinks' ),
3548                                 array( 'tl_namespace', 'tl_title' ),
3549                                 array( 'tl_from' => $id ),
3550                                 __METHOD__ );
3551
3552                         global $wgContLang;
3553
3554                         if( $res !== false ) {
3555                                 foreach( $res as $row ) {
3556                                         $tlTemplates[] = $wgContLang->getNsText( $row->tl_namespace ) . ':' . $row->tl_title ;
3557                                 }
3558                         }
3559
3560                         # Get templates from parser output.
3561                         $poTemplates_allns = $parserOutput->getTemplates();
3562
3563                         $poTemplates = array ();
3564                         foreach ( $poTemplates_allns as $ns_templates ) {
3565                                 $poTemplates = array_merge( $poTemplates, $ns_templates );
3566                         }
3567
3568                         # Get the diff
3569                         $templates_diff = array_diff( $poTemplates, $tlTemplates );
3570
3571                         if( count( $templates_diff ) > 0 ) {
3572                                 # Whee, link updates time.
3573                                 $u = new LinksUpdate( $this->mTitle, $parserOutput );
3574                                 $u->doUpdate();
3575                         }
3576                 }
3577
3578                 $wgOut->addParserOutput( $parserOutput );
3579         }
3580
3581         /**
3582          * Update all the appropriate counts in the category table, given that
3583          * we've added the categories $added and deleted the categories $deleted.
3584          *
3585          * @param $added array   The names of categories that were added
3586          * @param $deleted array The names of categories that were deleted
3587          * @return null
3588          */
3589         public function updateCategoryCounts( $added, $deleted ) {
3590                 $ns = $this->mTitle->getNamespace();
3591                 $dbw = wfGetDB( DB_MASTER );
3592
3593                 # First make sure the rows exist.  If one of the "deleted" ones didn't
3594                 # exist, we might legitimately not create it, but it's simpler to just
3595                 # create it and then give it a negative value, since the value is bogus
3596                 # anyway.
3597                 #
3598                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3599                 $insertCats = array_merge( $added, $deleted );
3600                 if( !$insertCats ) {
3601                         # Okay, nothing to do
3602                         return;
3603                 }
3604                 $insertRows = array();
3605                 foreach( $insertCats as $cat ) {
3606                         $insertRows[] = array( 'cat_title' => $cat );
3607                 }
3608                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3609
3610                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3611                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3612                 if( $ns == NS_CATEGORY ) {
3613                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3614                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3615                 } elseif( $ns == NS_FILE ) {
3616                         $addFields[]    = 'cat_files = cat_files + 1';
3617                         $removeFields[] = 'cat_files = cat_files - 1';
3618                 }
3619
3620                 if( $added ) {
3621                         $dbw->update(
3622                                 'category',
3623                                 $addFields,
3624                                 array( 'cat_title' => $added ),
3625                                 __METHOD__
3626                         );
3627                 }
3628                 if( $deleted ) {
3629                         $dbw->update(
3630                                 'category',
3631                                 $removeFields,
3632                                 array( 'cat_title' => $deleted ),
3633                                 __METHOD__
3634                         );
3635                 }
3636         }
3637 }