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