includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @package MediaWiki
   5  */
   6
   7 /**
   8  * Need the CacheManager to be loaded
   9  */
  10 require_once( 'CacheManager.php' );
  11 require_once( 'Revision.php' );
  12
  13 $wgArticleCurContentFields = false;
  14 $wgArticleOldContentFields = false;
  15
  16 /**
  17  * Class representing a MediaWiki article and history.
  18  *
  19  * See design.txt for an overview.
  20  * Note: edit user interface and cache support functions have been
  21  * moved to separate EditPage and CacheManager classes.
  22  *
  23  * @package MediaWiki
  24  */
  25 class Article {
  26         /**@{{
  27          * @private
  28          */
  29         var $mComment;                  //!<
  30         var $mContent;                  //!<
  31         var $mContentLoaded;    //!<
  32         var $mCounter;                  //!<
  33         var $mFileCache;                //!<
  34         var $mForUpdate;                //!<
  35         var $mGoodAdjustment;   //!<
  36         var $mId;                               //!<
  37         var $mLatest;                   //!<
  38         var $mMinorEdit;                //!<
  39         var $mOldId;                    //!<
  40         var $mRedirectedFrom;   //!<
  41         var $mRedirectUrl;              //!<
  42         var $mRevIdFetched;             //!<
  43         var $mRevision;                 //!<
  44         var $mTable;                    //!<
  45         var $mTimestamp;                //!<
  46         var $mTitle;                    //!<
  47         var $mTotalAdjustment;  //!<
  48         var $mTouched;                  //!<
  49         var $mUser;                             //!<
  50         var $mUserText;                 //!<
  51         /**@}}*/
  52
  53         /**
  54          * Constructor and clear the article
  55          * @param $title Reference to a Title object.
  56          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  57          */
  58         function Article( &$title, $oldId = null ) {
  59                 $this->mTitle =& $title;
  60                 $this->mOldId = $oldId;
  61                 $this->clear();
  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         function setRedirectedFrom( $from ) {
  70                 $this->mRedirectedFrom = $from;
  71         }
  72
  73         /**
  74          * @return mixed false, Title of in-wiki target, or string with URL
  75          */
  76         function followRedirect() {
  77                 $text = $this->getContent();
  78                 $rt = Title::newFromRedirect( $text );
  79
  80                 # process if title object is valid and not special:userlogout
  81                 if( $rt ) {
  82                         if( $rt->getInterwiki() != '' ) {
  83                                 if( $rt->isLocal() ) {
  84                                         // Offsite wikis need an HTTP redirect.
  85                                         //
  86                                         // This can be hard to reverse and may produce loops,
  87                                         // so they may be disabled in the site configuration.
  88
  89                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
  90                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
  91                                 }
  92                         } else {
  93                                 if( $rt->getNamespace() == NS_SPECIAL ) {
  94                                         // Gotta hand redirects to special pages differently:
  95                                         // Fill the HTTP response "Location" header and ignore
  96                                         // the rest of the page we're on.
  97                                         //
  98                                         // This can be hard to reverse, so they may be disabled.
  99
 100                                         if( $rt->getNamespace() == NS_SPECIAL && $rt->getText() == 'Userlogout' ) {
 101                                                 // rolleyes
 102                                         } else {
 103                                                 return $rt->getFullURL();
 104                                         }
 105                                 }
 106                                 return $rt;
 107                         }
 108                 }
 109
 110                 // No or invalid redirect
 111                 return false;
 112         }
 113
 114         /**
 115          * get the title object of the article
 116          */
 117         function getTitle() {
 118                 return $this->mTitle;
 119         }
 120
 121         /**
 122           * Clear the object
 123           * @private
 124           */
 125         function clear() {
 126                 $this->mDataLoaded    = false;
 127                 $this->mContentLoaded = false;
 128
 129                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 130                 $this->mRedirectedFrom = null; # Title object if set
 131                 $this->mUserText =
 132                 $this->mTimestamp = $this->mComment = $this->mFileCache = '';
 133                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 134                 $this->mTouched = '19700101000000';
 135                 $this->mForUpdate = false;
 136                 $this->mIsRedirect = false;
 137                 $this->mRevIdFetched = 0;
 138                 $this->mRedirectUrl = false;
 139                 $this->mLatest = false;
 140         }
 141
 142         /**
 143          * Note that getContent/loadContent do not follow redirects anymore.
 144          * If you need to fetch redirectable content easily, try
 145          * the shortcut in Article::followContent()
 146          * FIXME
 147          * @todo There are still side-effects in this!
 148          *        In general, you should use the Revision class, not Article,
 149          *        to fetch text for purposes other than page views.
 150          *
 151          * @return Return the text of this revision
 152         */
 153         function getContent() {
 154                 global $wgRequest, $wgUser, $wgOut;
 155
 156                 # Get variables from query string :P
 157                 $action = $wgRequest->getText( 'action', 'view' );
 158                 $section = $wgRequest->getText( 'section' );
 159                 $preload = $wgRequest->getText( 'preload' );
 160
 161                 $fname =  'Article::getContent';
 162                 wfProfileIn( $fname );
 163
 164                 if ( 0 == $this->getID() ) {
 165                         if ( 'edit' == $action ) {
 166                                 wfProfileOut( $fname );
 167
 168                                 # If requested, preload some text.
 169                                 $text=$this->getPreloadedText($preload);
 170
 171                                 # We used to put MediaWiki:Newarticletext here if
 172                                 # $text was empty at this point.
 173                                 # This is now shown above the edit box instead.
 174                                 return $text;
 175                         }
 176                         wfProfileOut( $fname );
 177                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 178
 179                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 180                                 $ret = wfMsgWeirdKey ( $this->mTitle->getText() ) ;
 181                         } else {
 182                                 $ret = wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' );
 183                         }
 184
 185                         return "<div class='noarticletext'>$ret</div>";
 186                 } else {
 187                         $this->loadContent();
 188                         if($action=='edit') {
 189                                 if($section!='') {
 190                                         if($section=='new') {
 191                                                 wfProfileOut( $fname );
 192                                                 $text=$this->getPreloadedText($preload);
 193                                                 return $text;
 194                                         }
 195
 196                                         # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
 197                                         # comments to be stripped as well)
 198                                         $rv=$this->getSection($this->mContent,$section);
 199                                         wfProfileOut( $fname );
 200                                         return $rv;
 201                                 }
 202                         }
 203                         wfProfileOut( $fname );
 204                         return $this->mContent;
 205                 }
 206         }
 207
 208         /**
 209          * Get the contents of a page from its title and remove includeonly tags
 210          *
 211          * @param $preload String: the title of the page.
 212          * @return string The contents of the page.
 213          */
 214         function getPreloadedText($preload) {
 215                 if ( $preload === '' )
 216                         return '';
 217                 else {
 218                         $preloadTitle = Title::newFromText( $preload );
 219                         if ( isset( $preloadTitle ) && $preloadTitle->userCanRead() ) {
 220                                 $rev=Revision::newFromTitle($preloadTitle);
 221                                 if ( is_object( $rev ) ) {
 222                                         $text = $rev->getText();
 223                                         // TODO FIXME: AAAAAAAAAAA, this shouldn't be implementing
 224                                         // its own mini-parser! -ævar
 225                                         $text = preg_replace( '~</?includeonly>~', '', $text );
 226                                         return $text;
 227                                 } else
 228                                         return '';
 229                         }
 230                 }
 231         }
 232
 233         /**
 234          * This function returns the text of a section, specified by a number ($section).
 235          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 236          * the first section before any such heading (section 0).
 237          *
 238          * If a section contains subsections, these are also returned.
 239          *
 240          * @param $text String: text to look in
 241          * @param $section Integer: section number
 242          * @return string text of the requested section
 243          */
 244         function getSection($text,$section) {
 245
 246                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
 247                 # comments to be stripped as well)
 248                 $striparray=array();
 249                 $parser=new Parser();
 250                 $parser->mOutputType=OT_WIKI;
 251                 $parser->mOptions = new ParserOptions();
 252                 $striptext=$parser->strip($text, $striparray, true);
 253
 254                 # now that we can be sure that no pseudo-sections are in the source,
 255                 # split it up by section
 256                 $secs =
 257                   preg_split(
 258                   '/(^=+.+?=+|^<h[1-6].*?>.*?<\/h[1-6].*?>)(?!\S)/mi',
 259                   $striptext, -1,
 260                   PREG_SPLIT_DELIM_CAPTURE);
 261                 if($section==0) {
 262                         $rv=$secs[0];
 263                 } else {
 264                         $headline=$secs[$section*2-1];
 265                         preg_match( '/^(=+).+?=+|^<h([1-6]).*?>.*?<\/h[1-6].*?>(?!\S)/mi',$headline,$matches);
 266                         $hlevel=$matches[1];
 267
 268                         # translate wiki heading into level
 269                         if(strpos($hlevel,'=')!==false) {
 270                                 $hlevel=strlen($hlevel);
 271                         }
 272
 273                         $rv=$headline. $secs[$section*2];
 274                         $count=$section+1;
 275
 276                         $break=false;
 277                         while(!empty($secs[$count*2-1]) && !$break) {
 278
 279                                 $subheadline=$secs[$count*2-1];
 280                                 preg_match( '/^(=+).+?=+|^<h([1-6]).*?>.*?<\/h[1-6].*?>(?!\S)/mi',$subheadline,$matches);
 281                                 $subhlevel=$matches[1];
 282                                 if(strpos($subhlevel,'=')!==false) {
 283                                         $subhlevel=strlen($subhlevel);
 284                                 }
 285                                 if($subhlevel > $hlevel) {
 286                                         $rv.=$subheadline.$secs[$count*2];
 287                                 }
 288                                 if($subhlevel <= $hlevel) {
 289                                         $break=true;
 290                                 }
 291                                 $count++;
 292
 293                         }
 294                 }
 295                 # reinsert stripped tags
 296                 $rv=$parser->unstrip($rv,$striparray);
 297                 $rv=$parser->unstripNoWiki($rv,$striparray);
 298                 $rv=trim($rv);
 299                 return $rv;
 300
 301         }
 302
 303         /**
 304          * @return int The oldid of the article that is to be shown, 0 for the
 305          *             current revision
 306          */
 307         function getOldID() {
 308                 if ( is_null( $this->mOldId ) ) {
 309                         $this->mOldId = $this->getOldIDFromRequest();
 310                 }
 311                 return $this->mOldId;
 312         }
 313
 314         /**
 315          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 316          *
 317          * @return int The old id for the request
 318          */
 319         function getOldIDFromRequest() {
 320                 global $wgRequest;
 321                 $this->mRedirectUrl = false;
 322                 $oldid = $wgRequest->getVal( 'oldid' );
 323                 if ( isset( $oldid ) ) {
 324                         $oldid = intval( $oldid );
 325                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 326                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 327                                 if ( $nextid  ) {
 328                                         $oldid = $nextid;
 329                                 } else {
 330                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 331                                 }
 332                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 333                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 334                                 if ( $previd ) {
 335                                         $oldid = $previd;
 336                                 } else {
 337                                         # TODO
 338                                 }
 339                         }
 340                         # unused:
 341                         # $lastid = $oldid;
 342                 }
 343                 if ( !$oldid ) {
 344                         $oldid = 0;
 345                 }
 346                 return $oldid;
 347         }
 348
 349         /**
 350          * Load the revision (including text) into this object
 351          */
 352         function loadContent() {
 353                 if ( $this->mContentLoaded ) return;
 354
 355                 # Query variables :P
 356                 $oldid = $this->getOldID();
 357
 358                 # Pre-fill content with error message so that if something
 359                 # fails we'll have something telling us what we intended.
 360
 361                 $t = $this->mTitle->getPrefixedText();
 362
 363                 $this->mOldId = $oldid;
 364                 $this->fetchContent( $oldid );
 365         }
 366
 367
 368         /**
 369          * Fetch a page record with the given conditions
 370          * @param Database $dbr
 371          * @param array    $conditions
 372          * @private
 373          */
 374         function pageData( &$dbr, $conditions ) {
 375                 $fields = array(
 376                                 'page_id',
 377                                 'page_namespace',
 378                                 'page_title',
 379                                 'page_restrictions',
 380                                 'page_counter',
 381                                 'page_is_redirect',
 382                                 'page_is_new',
 383                                 'page_random',
 384                                 'page_touched',
 385                                 'page_latest',
 386                                 'page_len' ) ;
 387                 wfRunHooks( 'ArticlePageDataBefore', array( &$this , &$fields ) )       ;
 388                 $row = $dbr->selectRow( 'page',
 389                         $fields,
 390                         $conditions,
 391                         'Article::pageData' );
 392                 wfRunHooks( 'ArticlePageDataAfter', array( &$this , &$row ) )   ;
 393                 return $row ;
 394         }
 395
 396         /**
 397          * @param Database $dbr
 398          * @param Title $title
 399          */
 400         function pageDataFromTitle( &$dbr, $title ) {
 401                 return $this->pageData( $dbr, array(
 402                         'page_namespace' => $title->getNamespace(),
 403                         'page_title'     => $title->getDBkey() ) );
 404         }
 405
 406         /**
 407          * @param Database $dbr
 408          * @param int $id
 409          */
 410         function pageDataFromId( &$dbr, $id ) {
 411                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 412         }
 413
 414         /**
 415          * Set the general counter, title etc data loaded from
 416          * some source.
 417          *
 418          * @param object $data
 419          * @private
 420          */
 421         function loadPageData( $data = 'fromdb' ) {
 422                 if ( $data === 'fromdb' ) {
 423                         $dbr =& $this->getDB();
 424                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 425                 }
 426
 427                 $lc =& LinkCache::singleton();
 428                 if ( $data ) {
 429                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle );
 430
 431                         $this->mTitle->mArticleID = $data->page_id;
 432                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 433                         $this->mTitle->mRestrictionsLoaded = true;
 434
 435                         $this->mCounter     = $data->page_counter;
 436                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 437                         $this->mIsRedirect  = $data->page_is_redirect;
 438                         $this->mLatest      = $data->page_latest;
 439                 } else {
 440                         if ( is_object( $this->mTitle ) ) {
 441                                 $lc->addBadLinkObj( $this->mTitle );
 442                         }
 443                         $this->mTitle->mArticleID = 0;
 444                 }
 445
 446                 $this->mDataLoaded  = true;
 447         }
 448
 449         /**
 450          * Get text of an article from database
 451          * Does *NOT* follow redirects.
 452          * @param int $oldid 0 for whatever the latest revision is
 453          * @return string
 454          */
 455         function fetchContent( $oldid = 0 ) {
 456                 if ( $this->mContentLoaded ) {
 457                         return $this->mContent;
 458                 }
 459
 460                 $dbr =& $this->getDB();
 461                 $fname = 'Article::fetchContent';
 462
 463                 # Pre-fill content with error message so that if something
 464                 # fails we'll have something telling us what we intended.
 465                 $t = $this->mTitle->getPrefixedText();
 466                 if( $oldid ) {
 467                         $t .= ',oldid='.$oldid;
 468                 }
 469                 $this->mContent = wfMsg( 'missingarticle', $t ) ;
 470
 471                 if( $oldid ) {
 472                         $revision = Revision::newFromId( $oldid );
 473                         if( is_null( $revision ) ) {
 474                                 wfDebug( "$fname failed to retrieve specified revision, id $oldid\n" );
 475                                 return false;
 476                         }
 477                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 478                         if( !$data ) {
 479                                 wfDebug( "$fname failed to get page data linked to revision id $oldid\n" );
 480                                 return false;
 481                         }
 482                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 483                         $this->loadPageData( $data );
 484                 } else {
 485                         if( !$this->mDataLoaded ) {
 486                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 487                                 if( !$data ) {
 488                                         wfDebug( "$fname failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 489                                         return false;
 490                                 }
 491                                 $this->loadPageData( $data );
 492                         }
 493                         $revision = Revision::newFromId( $this->mLatest );
 494                         if( is_null( $revision ) ) {
 495                                 wfDebug( "$fname failed to retrieve current page, rev_id {$data->page_latest}\n" );
 496                                 return false;
 497                         }
 498                 }
 499
 500                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 501                 // We should instead work with the Revision object when we need it...
 502                 $this->mContent = $revision->userCan( MW_REV_DELETED_TEXT ) ? $revision->getRawText() : "";
 503                 //$this->mContent   = $revision->getText();
 504
 505                 $this->mUser      = $revision->getUser();
 506                 $this->mUserText  = $revision->getUserText();
 507                 $this->mComment   = $revision->getComment();
 508                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 509
 510                 $this->mRevIdFetched = $revision->getID();
 511                 $this->mContentLoaded = true;
 512                 $this->mRevision =& $revision;
 513
 514                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 515
 516                 return $this->mContent;
 517         }
 518
 519         /**
 520          * Read/write accessor to select FOR UPDATE
 521          *
 522          * @param $x Mixed: FIXME
 523          */
 524         function forUpdate( $x = NULL ) {
 525                 return wfSetVar( $this->mForUpdate, $x );
 526         }
 527
 528         /**
 529          * Get the database which should be used for reads
 530          *
 531          * @return Database
 532          */
 533         function &getDB() {
 534                 $ret =& wfGetDB( DB_MASTER );
 535                 return $ret;
 536         }
 537
 538         /**
 539          * Get options for all SELECT statements
 540          *
 541          * @param $options Array: an optional options array which'll be appended to
 542          *                       the default
 543          * @return Array: options
 544          */
 545         function getSelectOptions( $options = '' ) {
 546                 if ( $this->mForUpdate ) {
 547                         if ( is_array( $options ) ) {
 548                                 $options[] = 'FOR UPDATE';
 549                         } else {
 550                                 $options = 'FOR UPDATE';
 551                         }
 552                 }
 553                 return $options;
 554         }
 555
 556         /**
 557          * @return int Page ID
 558          */
 559         function getID() {
 560                 if( $this->mTitle ) {
 561                         return $this->mTitle->getArticleID();
 562                 } else {
 563                         return 0;
 564                 }
 565         }
 566
 567         /**
 568          * @return bool Whether or not the page exists in the database
 569          */
 570         function exists() {
 571                 return $this->getId() != 0;
 572         }
 573
 574         /**
 575          * @return int The view count for the page
 576          */
 577         function getCount() {
 578                 if ( -1 == $this->mCounter ) {
 579                         $id = $this->getID();
 580                         if ( $id == 0 ) {
 581                                 $this->mCounter = 0;
 582                         } else {
 583                                 $dbr =& wfGetDB( DB_SLAVE );
 584                                 $this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
 585                                         'Article::getCount', $this->getSelectOptions() );
 586                         }
 587                 }
 588                 return $this->mCounter;
 589         }
 590
 591         /**
 592          * Determine whether a page  would be suitable for being counted as an
 593          * article in the site_stats table based on the title & its content
 594          *
 595          * @param $text String: text to analyze
 596          * @return bool
 597          */
 598         function isCountable( $text ) {
 599                 global $wgUseCommaCount;
 600
 601                 $token = $wgUseCommaCount ? ',' : '[[';
 602                 return
 603                         $this->mTitle->getNamespace() == NS_MAIN
 604                         && ! $this->isRedirect( $text )
 605                         && in_string( $token, $text );
 606         }
 607
 608         /**
 609          * Tests if the article text represents a redirect
 610          *
 611          * @param $text String: FIXME
 612          * @return bool
 613          */
 614         function isRedirect( $text = false ) {
 615                 if ( $text === false ) {
 616                         $this->loadContent();
 617                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 618                 } else {
 619                         $titleObj = Title::newFromRedirect( $text );
 620                 }
 621                 return $titleObj !== NULL;
 622         }
 623
 624         /**
 625          * Returns true if the currently-referenced revision is the current edit
 626          * to this page (and it exists).
 627          * @return bool
 628          */
 629         function isCurrent() {
 630                 return $this->exists() &&
 631                         isset( $this->mRevision ) &&
 632                         $this->mRevision->isCurrent();
 633         }
 634
 635         /**
 636          * Loads everything except the text
 637          * This isn't necessary for all uses, so it's only done if needed.
 638          * @private
 639          */
 640         function loadLastEdit() {
 641                 if ( -1 != $this->mUser )
 642                         return;
 643
 644                 # New or non-existent articles have no user information
 645                 $id = $this->getID();
 646                 if ( 0 == $id ) return;
 647
 648                 $this->mLastRevision = Revision::loadFromPageId( $this->getDB(), $id );
 649                 if( !is_null( $this->mLastRevision ) ) {
 650                         $this->mUser      = $this->mLastRevision->getUser();
 651                         $this->mUserText  = $this->mLastRevision->getUserText();
 652                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 653                         $this->mComment   = $this->mLastRevision->getComment();
 654                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 655                         $this->mRevIdFetched = $this->mLastRevision->getID();
 656                 }
 657         }
 658
 659         function getTimestamp() {
 660                 // Check if the field has been filled by ParserCache::get()
 661                 if ( !$this->mTimestamp ) {
 662                         $this->loadLastEdit();
 663                 }
 664                 return wfTimestamp(TS_MW, $this->mTimestamp);
 665         }
 666
 667         function getUser() {
 668                 $this->loadLastEdit();
 669                 return $this->mUser;
 670         }
 671
 672         function getUserText() {
 673                 $this->loadLastEdit();
 674                 return $this->mUserText;
 675         }
 676
 677         function getComment() {
 678                 $this->loadLastEdit();
 679                 return $this->mComment;
 680         }
 681
 682         function getMinorEdit() {
 683                 $this->loadLastEdit();
 684                 return $this->mMinorEdit;
 685         }
 686
 687         function getRevIdFetched() {
 688                 $this->loadLastEdit();
 689                 return $this->mRevIdFetched;
 690         }
 691
 692         /**
 693          * @todo Document, fixme $offset never used.
 694          * @param $limit Integer: default 0.
 695          * @param $offset Integer: default 0.
 696          */
 697         function getContributors($limit = 0, $offset = 0) {
 698                 $fname = 'Article::getContributors';
 699
 700                 # XXX: this is expensive; cache this info somewhere.
 701
 702                 $title = $this->mTitle;
 703                 $contribs = array();
 704                 $dbr =& wfGetDB( DB_SLAVE );
 705                 $revTable = $dbr->tableName( 'revision' );
 706                 $userTable = $dbr->tableName( 'user' );
 707                 $encDBkey = $dbr->addQuotes( $title->getDBkey() );
 708                 $ns = $title->getNamespace();
 709                 $user = $this->getUser();
 710                 $pageId = $this->getId();
 711
 712                 $sql = "SELECT rev_user, rev_user_text, user_real_name, MAX(rev_timestamp) as timestamp
 713                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 714                         WHERE rev_page = $pageId
 715                         AND rev_user != $user
 716                         GROUP BY rev_user, rev_user_text, user_real_name
 717                         ORDER BY timestamp DESC";
 718
 719                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 720                 $sql .= ' '. $this->getSelectOptions();
 721
 722                 $res = $dbr->query($sql, $fname);
 723
 724                 while ( $line = $dbr->fetchObject( $res ) ) {
 725                         $contribs[] = array($line->rev_user, $line->rev_user_text, $line->user_real_name);
 726                 }
 727
 728                 $dbr->freeResult($res);
 729                 return $contribs;
 730         }
 731
 732         /**
 733          * This is the default action of the script: just view the page of
 734          * the given title.
 735         */
 736         function view() {
 737                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 738                 global $wgEnableParserCache, $wgStylePath, $wgUseRCPatrol, $wgParser;
 739                 global $wgUseTrackbacks;
 740                 $sk = $wgUser->getSkin();
 741
 742                 $fname = 'Article::view';
 743                 wfProfileIn( $fname );
 744                 $parserCache =& ParserCache::singleton();
 745                 # Get variables from query string
 746                 $oldid = $this->getOldID();
 747
 748                 # getOldID may want us to redirect somewhere else
 749                 if ( $this->mRedirectUrl ) {
 750                         $wgOut->redirect( $this->mRedirectUrl );
 751                         wfProfileOut( $fname );
 752                         return;
 753                 }
 754
 755                 $diff = $wgRequest->getVal( 'diff' );
 756                 $rcid = $wgRequest->getVal( 'rcid' );
 757                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 758
 759                 $wgOut->setArticleFlag( true );
 760                 $wgOut->setRobotpolicy( 'index,follow' );
 761                 # If we got diff and oldid in the query, we want to see a
 762                 # diff page instead of the article.
 763
 764                 if ( !is_null( $diff ) ) {
 765                         require_once( 'DifferenceEngine.php' );
 766                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 767
 768                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid );
 769                         // DifferenceEngine directly fetched the revision:
 770                         $this->mRevIdFetched = $de->mNewid;
 771                         $de->showDiffPage();
 772
 773                         if( $diff == 0 ) {
 774                                 # Run view updates for current revision only
 775                                 $this->viewUpdates();
 776                         }
 777                         wfProfileOut( $fname );
 778                         return;
 779                 }
 780
 781                 if ( empty( $oldid ) && $this->checkTouched() ) {
 782                         $wgOut->setETag($parserCache->getETag($this, $wgUser));
 783
 784                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 785                                 wfProfileOut( $fname );
 786                                 return;
 787                         } else if ( $this->tryFileCache() ) {
 788                                 # tell wgOut that output is taken care of
 789                                 $wgOut->disable();
 790                                 $this->viewUpdates();
 791                                 wfProfileOut( $fname );
 792                                 return;
 793                         }
 794                 }
 795                 # Should the parser cache be used?
 796                 $pcache = $wgEnableParserCache &&
 797                         intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
 798                         $this->exists() &&
 799                         empty( $oldid );
 800                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 801                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 802                         wfIncrStats( 'pcache_miss_stub' );
 803                 }
 804
 805                 $wasRedirected = false;
 806                 if ( isset( $this->mRedirectedFrom ) ) {
 807                         // This is an internally redirected page view.
 808                         // We'll need a backlink to the source page for navigation.
 809                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 810                                 $sk = $wgUser->getSkin();
 811                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 812                                 $s = wfMsg( 'redirectedfrom', $redir );
 813                                 $wgOut->setSubtitle( $s );
 814                                 $wasRedirected = true;
 815                         }
 816                 } elseif ( !empty( $rdfrom ) ) {
 817                         // This is an externally redirected view, from some other wiki.
 818                         // If it was reported from a trusted site, supply a backlink.
 819                         global $wgRedirectSources;
 820                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 821                                 $sk = $wgUser->getSkin();
 822                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 823                                 $s = wfMsg( 'redirectedfrom', $redir );
 824                                 $wgOut->setSubtitle( $s );
 825                                 $wasRedirected = true;
 826                         }
 827                 }
 828
 829                 $outputDone = false;
 830                 if ( $pcache ) {
 831                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 832                                 $outputDone = true;
 833                         }
 834                 }
 835                 if ( !$outputDone ) {
 836                         $text = $this->getContent();
 837                         if ( $text === false ) {
 838                                 # Failed to load, replace text with error message
 839                                 $t = $this->mTitle->getPrefixedText();
 840                                 if( $oldid ) {
 841                                         $t .= ',oldid='.$oldid;
 842                                         $text = wfMsg( 'missingarticle', $t );
 843                                 } else {
 844                                         $text = wfMsg( 'noarticletext', $t );
 845                                 }
 846                         }
 847
 848                         # Another whitelist check in case oldid is altering the title
 849                         if ( !$this->mTitle->userCanRead() ) {
 850                                 $wgOut->loginToUse();
 851                                 $wgOut->output();
 852                                 exit;
 853                         }
 854
 855                         # We're looking at an old revision
 856
 857                         if ( !empty( $oldid ) ) {
 858                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 859                                 if( is_null( $this->mRevision ) ) {
 860                                         // FIXME: This would be a nice place to load the 'no such page' text.
 861                                 } else {
 862                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 863                                         if( $this->mRevision->isDeleted( MW_REV_DELETED_TEXT ) ) {
 864                                                 if( !$this->mRevision->userCan( MW_REV_DELETED_TEXT ) ) {
 865                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-permission' ) );
 866                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 867                                                         return;
 868                                                 } else {
 869                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-view' ) );
 870                                                         // and we are allowed to see...
 871                                                 }
 872                                         }
 873                                 }
 874
 875                         }
 876                 }
 877                 if( !$outputDone ) {
 878                         /**
 879                          * @fixme: this hook doesn't work most of the time, as it doesn't
 880                          * trigger when the parser cache is used.
 881                          */
 882                         wfRunHooks( 'ArticleViewHeader', array( &$this ) ) ;
 883                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 884                         # wrap user css and user js in pre and don't parse
 885                         # XXX: use $this->mTitle->usCssJsSubpage() when php is fixed/ a workaround is found
 886                         if (
 887                                 $this->mTitle->getNamespace() == NS_USER &&
 888                                 preg_match('/\\/[\\w]+\\.(css|js)$/', $this->mTitle->getDBkey())
 889                         ) {
 890                                 $wgOut->addWikiText( wfMsg('clearyourcache'));
 891                                 $wgOut->addHTML( '<pre>'.htmlspecialchars($this->mContent)."\n</pre>" );
 892                         } else if ( $rt = Title::newFromRedirect( $text ) ) {
 893                                 # Display redirect
 894                                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 895                                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 896                                 # Don't overwrite the subtitle if this was an old revision
 897                                 if( !$wasRedirected && $this->isCurrent() ) {
 898                                         $wgOut->setSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 899                                 }
 900                                 $targetUrl = $rt->escapeLocalURL();
 901                                 # fixme unused $titleText :
 902                                 $titleText = htmlspecialchars( $rt->getPrefixedText() );
 903                                 $link = $sk->makeLinkObj( $rt );
 904
 905                                 $wgOut->addHTML( '<img src="'.$imageUrl.'" alt="#REDIRECT" />' .
 906                                   '<span class="redirectText">'.$link.'</span>' );
 907
 908                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 909                                 $wgOut->addParserOutputNoText( $parseout );
 910                         } else if ( $pcache ) {
 911                                 # Display content and save to parser cache
 912                                 $wgOut->addPrimaryWikiText( $text, $this );
 913                         } else {
 914                                 # Display content, don't attempt to save to parser cache
 915
 916                                 # Don't show section-edit links on old revisions... this way lies madness.
 917                                 if( !$this->isCurrent() ) {
 918                                         $oldEditSectionSetting = $wgOut->mParserOptions->setEditSection( false );
 919                                 }
 920                                 # Display content and don't save to parser cache
 921                                 $wgOut->addPrimaryWikiText( $text, $this, false );
 922
 923                                 if( !$this->isCurrent() ) {
 924                                         $wgOut->mParserOptions->setEditSection( $oldEditSectionSetting );
 925                                 }
 926                         }
 927                 }
 928                 /* title may have been set from the cache */
 929                 $t = $wgOut->getPageTitle();
 930                 if( empty( $t ) ) {
 931                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 932                 }
 933
 934                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 935                 if( $this->mTitle->getNamespace() == NS_USER_TALK &&
 936                         User::isIP( $this->mTitle->getText() ) ) {
 937                         $wgOut->addWikiText( wfMsg('anontalkpagetext') );
 938                 }
 939
 940                 # If we have been passed an &rcid= parameter, we want to give the user a
 941                 # chance to mark this new article as patrolled.
 942                 if ( $wgUseRCPatrol && !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) ) {
 943                         $wgOut->addHTML(
 944                                 "<div class='patrollink'>" .
 945                                         wfMsg ( 'markaspatrolledlink',
 946                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsg('markaspatrolledtext'), "action=markpatrolled&rcid=$rcid" )
 947                                         ) .
 948                                 '</div>'
 949                          );
 950                 }
 951
 952                 # Trackbacks
 953                 if ($wgUseTrackbacks)
 954                         $this->addTrackbacks();
 955
 956                 $this->viewUpdates();
 957                 wfProfileOut( $fname );
 958         }
 959
 960         function addTrackbacks() {
 961                 global $wgOut, $wgUser;
 962
 963                 $dbr =& wfGetDB(DB_SLAVE);
 964                 $tbs = $dbr->select(
 965                                 /* FROM   */ 'trackbacks',
 966                                 /* SELECT */ array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
 967                                 /* WHERE  */ array('tb_page' => $this->getID())
 968                 );
 969
 970                 if (!$dbr->numrows($tbs))
 971                         return;
 972
 973                 $tbtext = "";
 974                 while ($o = $dbr->fetchObject($tbs)) {
 975                         $rmvtxt = "";
 976                         if ($wgUser->isAllowed( 'trackback' )) {
 977                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid="
 978                                                 . $o->tb_id . "&token=" . $wgUser->editToken());
 979                                 $rmvtxt = wfMsg('trackbackremove', $delurl);
 980                         }
 981                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
 982                                         $o->tb_title,
 983                                         $o->tb_url,
 984                                         $o->tb_ex,
 985                                         $o->tb_name,
 986                                         $rmvtxt);
 987                 }
 988                 $wgOut->addWikitext(wfMsg('trackbackbox', $tbtext));
 989         }
 990
 991         function deletetrackback() {
 992                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
 993
 994                 if (!$wgUser->matchEditToken($wgRequest->getVal('token'))) {
 995                         $wgOut->addWikitext(wfMsg('sessionfailure'));
 996                         return;
 997                 }
 998
 999                 if ((!$wgUser->isAllowed('delete'))) {
1000                         $wgOut->sysopRequired();
1001                         return;
1002                 }
1003
1004                 if (wfReadOnly()) {
1005                         $wgOut->readOnlyPage();
1006                         return;
1007                 }
1008
1009                 $db =& wfGetDB(DB_MASTER);
1010                 $db->delete('trackbacks', array('tb_id' => $wgRequest->getInt('tbid')));
1011                 $wgTitle->invalidateCache();
1012                 $wgOut->addWikiText(wfMsg('trackbackdeleteok'));
1013         }
1014
1015         function render() {
1016                 global $wgOut;
1017
1018                 $wgOut->setArticleBodyOnly(true);
1019                 $this->view();
1020         }
1021
1022         /**
1023          * Handle action=purge
1024          */
1025         function purge() {
1026                 global $wgUser, $wgRequest, $wgOut;
1027
1028                 if ( $wgUser->isLoggedIn() || $wgRequest->wasPosted() ) {
1029                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1030                                 $this->doPurge();
1031                         }
1032                 } else {
1033                         $msg = $wgOut->parse( wfMsg( 'confirm_purge' ) );
1034                         $action = $this->mTitle->escapeLocalURL( 'action=purge' );
1035                         $button = htmlspecialchars( wfMsg( 'confirm_purge_button' ) );
1036                         $msg = str_replace( '$1',
1037                                 "<form method=\"post\" action=\"$action\">\n" .
1038                                 "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1039                                 "</form>\n", $msg );
1040
1041                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1042                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1043                         $wgOut->addHTML( $msg );
1044                 }
1045         }
1046
1047         /**
1048          * Perform the actions of a page purging
1049          */
1050         function doPurge() {
1051                 global $wgUseSquid;
1052                 // Invalidate the cache
1053                 $this->mTitle->invalidateCache();
1054
1055                 if ( $wgUseSquid ) {
1056                         // Commit the transaction before the purge is sent
1057                         $dbw = wfGetDB( DB_MASTER );
1058                         $dbw->immediateCommit();
1059
1060                         // Send purge
1061                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1062                         $update->doUpdate();
1063                 }
1064                 $this->view();
1065         }
1066
1067         /**
1068          * Insert a new empty page record for this article.
1069          * This *must* be followed up by creating a revision
1070          * and running $this->updateToLatest( $rev_id );
1071          * or else the record will be left in a funky state.
1072          * Best if all done inside a transaction.
1073          *
1074          * @param Database $dbw
1075          * @param string   $restrictions
1076          * @return int     The newly created page_id key
1077          * @private
1078          */
1079         function insertOn( &$dbw, $restrictions = '' ) {
1080                 $fname = 'Article::insertOn';
1081                 wfProfileIn( $fname );
1082
1083                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1084                 $dbw->insert( 'page', array(
1085                         'page_id'           => $page_id,
1086                         'page_namespace'    => $this->mTitle->getNamespace(),
1087                         'page_title'        => $this->mTitle->getDBkey(),
1088                         'page_counter'      => 0,
1089                         'page_restrictions' => $restrictions,
1090                         'page_is_redirect'  => 0, # Will set this shortly...
1091                         'page_is_new'       => 1,
1092                         'page_random'       => wfRandom(),
1093                         'page_touched'      => $dbw->timestamp(),
1094                         'page_latest'       => 0, # Fill this in shortly...
1095                         'page_len'          => 0, # Fill this in shortly...
1096                 ), $fname );
1097                 $newid = $dbw->insertId();
1098
1099                 $this->mTitle->resetArticleId( $newid );
1100
1101                 wfProfileOut( $fname );
1102                 return $newid;
1103         }
1104
1105         /**
1106          * Update the page record to point to a newly saved revision.
1107          *
1108          * @param Database $dbw
1109          * @param Revision $revision For ID number, and text used to set
1110                                      length and redirect status fields
1111          * @param int $lastRevision If given, will not overwrite the page field
1112          *                          when different from the currently set value.
1113          *                          Giving 0 indicates the new page flag should
1114          *                          be set on.
1115          * @return bool true on success, false on failure
1116          * @private
1117          */
1118         function updateRevisionOn( &$dbw, $revision, $lastRevision = null ) {
1119                 $fname = 'Article::updateToRevision';
1120                 wfProfileIn( $fname );
1121
1122                 $conditions = array( 'page_id' => $this->getId() );
1123                 if( !is_null( $lastRevision ) ) {
1124                         # An extra check against threads stepping on each other
1125                         $conditions['page_latest'] = $lastRevision;
1126                 }
1127
1128                 $text = $revision->getText();
1129                 $dbw->update( 'page',
1130                         array( /* SET */
1131                                 'page_latest'      => $revision->getId(),
1132                                 'page_touched'     => $dbw->timestamp(),
1133                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1134                                 'page_is_redirect' => Article::isRedirect( $text ) ? 1 : 0,
1135                                 'page_len'         => strlen( $text ),
1136                         ),
1137                         $conditions,
1138                         $fname );
1139
1140                 wfProfileOut( $fname );
1141                 return ( $dbw->affectedRows() != 0 );
1142         }
1143
1144         /**
1145          * If the given revision is newer than the currently set page_latest,
1146          * update the page record. Otherwise, do nothing.
1147          *
1148          * @param Database $dbw
1149          * @param Revision $revision
1150          */
1151         function updateIfNewerOn( &$dbw, $revision ) {
1152                 $fname = 'Article::updateIfNewerOn';
1153                 wfProfileIn( $fname );
1154
1155                 $row = $dbw->selectRow(
1156                         array( 'revision', 'page' ),
1157                         array( 'rev_id', 'rev_timestamp' ),
1158                         array(
1159                                 'page_id' => $this->getId(),
1160                                 'page_latest=rev_id' ),
1161                         $fname );
1162                 if( $row ) {
1163                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1164                                 wfProfileOut( $fname );
1165                                 return false;
1166                         }
1167                         $prev = $row->rev_id;
1168                 } else {
1169                         # No or missing previous revision; mark the page as new
1170                         $prev = 0;
1171                 }
1172
1173                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev );
1174                 wfProfileOut( $fname );
1175                 return $ret;
1176         }
1177
1178         /**
1179          * Insert a new article into the database
1180          * @private
1181          */
1182         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false ) {
1183                 global $wgUser;
1184
1185                 $fname = 'Article::insertNewArticle';
1186                 wfProfileIn( $fname );
1187
1188                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1189                         &$summary, &$isminor, &$watchthis, NULL ) ) ) {
1190                         wfDebug( "$fname: ArticleSave hook aborted save!\n" );
1191                         wfProfileOut( $fname );
1192                         return false;
1193                 }
1194
1195                 $ns = $this->mTitle->getNamespace();
1196                 $ttl = $this->mTitle->getDBkey();
1197
1198                 # If this is a comment, add the summary as headline
1199                 if($comment && $summary!="") {
1200                         $text="== {$summary} ==\n\n".$text;
1201                 }
1202                 $text = $this->preSaveTransform( $text );
1203
1204
1205                 # Set statistics members
1206                 # We work out if it's countable after PST to avoid counter drift
1207                 # when articles are created with {{subst:}}
1208                 $this->mGoodAdjustment = (int)$this->isCountable( $text );
1209                 $this->mTotalAdjustment = 1;
1210
1211                 /* Silently ignore minoredit if not allowed */
1212                 $isminor = $isminor && $wgUser->isAllowed('minoredit');
1213                 $now = wfTimestampNow();
1214
1215                 $dbw =& wfGetDB( DB_MASTER );
1216
1217                 # Add the page record; stake our claim on this title!
1218                 $newid = $this->insertOn( $dbw );
1219
1220                 # Save the revision text...
1221                 $revision = new Revision( array(
1222                         'page'       => $newid,
1223                         'comment'    => $summary,
1224                         'minor_edit' => $isminor,
1225                         'text'       => $text
1226                         ) );
1227                 $revisionId = $revision->insertOn( $dbw );
1228
1229                 $this->mTitle->resetArticleID( $newid );
1230
1231                 # Update the page record with revision data
1232                 $this->updateRevisionOn( $dbw, $revision, 0 );
1233
1234                 Article::onArticleCreate( $this->mTitle );
1235                 if(!$suppressRC) {
1236                         require_once( 'RecentChange.php' );
1237                         $rcid = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary, 'default',
1238                           '', strlen( $text ), $revisionId );
1239                         # Mark as patrolled if the user can and has the option set
1240                         if( $wgUser->isAllowed( 'patrol' ) && $wgUser->getOption( 'autopatrol' ) ) {
1241                                 RecentChange::markPatrolled( $rcid );
1242                         }
1243                 }
1244
1245                 if ($watchthis) {
1246                         if(!$this->mTitle->userIsWatching()) $this->doWatch();
1247                 } else {
1248                         if ( $this->mTitle->userIsWatching() ) {
1249                                 $this->doUnwatch();
1250                         }
1251                 }
1252
1253                 # The talk page isn't in the regular link tables, so we need to update manually:
1254                 $talkns = $ns ^ 1; # talk -> normal; normal -> talk
1255                 $dbw->update( 'page',
1256                         array( 'page_touched' => $dbw->timestamp($now) ),
1257                         array( 'page_namespace' => $talkns,
1258                                'page_title' => $ttl ),
1259                         $fname );
1260
1261                 # standard deferred updates
1262                 $this->editUpdates( $text, $summary, $isminor, $now, $revisionId );
1263
1264                 $oldid = 0; # new article
1265                 $this->showArticle( $text, wfMsg( 'newarticle' ), false, $isminor, $now, $summary, $oldid );
1266
1267                 wfRunHooks( 'ArticleInsertComplete', array( &$this, &$wgUser, $text,
1268                         $summary, $isminor,
1269                         $watchthis, NULL ) );
1270                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$wgUser, $text,
1271                         $summary, $isminor,
1272                         $watchthis, NULL ) );
1273                 wfProfileOut( $fname );
1274         }
1275
1276         /**
1277          * @return string Complete article text, or null if error
1278          */
1279         function replaceSection($section, $text, $summary = '', $edittime = NULL) {
1280                 $fname = 'Article::replaceSection';
1281                 wfProfileIn( $fname );
1282
1283                 if ($section != '') {
1284                         if( is_null( $edittime ) ) {
1285                                 $rev = Revision::newFromTitle( $this->mTitle );
1286                         } else {
1287                                 $dbw =& wfGetDB( DB_MASTER );
1288                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1289                         }
1290                         if( is_null( $rev ) ) {
1291                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1292                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1293                                 return null;
1294                         }
1295                         $oldtext = $rev->getText();
1296
1297                         if($section=='new') {
1298                                 if($summary) $subject="== {$summary} ==\n\n";
1299                                 $text=$oldtext."\n\n".$subject.$text;
1300                         } else {
1301
1302                                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
1303                                 # comments to be stripped as well)
1304                                 $striparray=array();
1305                                 $parser=new Parser();
1306                                 $parser->mOutputType=OT_WIKI;
1307                                 $parser->mOptions = new ParserOptions();
1308                                 $oldtext=$parser->strip($oldtext, $striparray, true);
1309
1310                                 # now that we can be sure that no pseudo-sections are in the source,
1311                                 # split it up
1312                                 # Unfortunately we can't simply do a preg_replace because that might
1313                                 # replace the wrong section, so we have to use the section counter instead
1314                                 $secs=preg_split('/(^=+.+?=+|^<h[1-6].*?>.*?<\/h[1-6].*?>)(?!\S)/mi',
1315                                   $oldtext,-1,PREG_SPLIT_DELIM_CAPTURE);
1316                                 $secs[$section*2]=$text."\n\n"; // replace with edited
1317
1318                                 # section 0 is top (intro) section
1319                                 if($section!=0) {
1320
1321                                         # headline of old section - we need to go through this section
1322                                         # to determine if there are any subsections that now need to
1323                                         # be erased, as the mother section has been replaced with
1324                                         # the text of all subsections.
1325                                         $headline=$secs[$section*2-1];
1326                                         preg_match( '/^(=+).+?=+|^<h([1-6]).*?>.*?<\/h[1-6].*?>(?!\S)/mi',$headline,$matches);
1327                                         $hlevel=$matches[1];
1328
1329                                         # determine headline level for wikimarkup headings
1330                                         if(strpos($hlevel,'=')!==false) {
1331                                                 $hlevel=strlen($hlevel);
1332                                         }
1333
1334                                         $secs[$section*2-1]=''; // erase old headline
1335                                         $count=$section+1;
1336                                         $break=false;
1337                                         while(!empty($secs[$count*2-1]) && !$break) {
1338
1339                                                 $subheadline=$secs[$count*2-1];
1340                                                 preg_match(
1341                                                  '/^(=+).+?=+|^<h([1-6]).*?>.*?<\/h[1-6].*?>(?!\S)/mi',$subheadline,$matches);
1342                                                 $subhlevel=$matches[1];
1343                                                 if(strpos($subhlevel,'=')!==false) {
1344                                                         $subhlevel=strlen($subhlevel);
1345                                                 }
1346                                                 if($subhlevel > $hlevel) {
1347                                                         // erase old subsections
1348                                                         $secs[$count*2-1]='';
1349                                                         $secs[$count*2]='';
1350                                                 }
1351                                                 if($subhlevel <= $hlevel) {
1352                                                         $break=true;
1353                                                 }
1354                                                 $count++;
1355
1356                                         }
1357
1358                                 }
1359                                 $text=join('',$secs);
1360                                 # reinsert the stuff that we stripped out earlier
1361                                 $text=$parser->unstrip($text,$striparray);
1362                                 $text=$parser->unstripNoWiki($text,$striparray);
1363                         }
1364
1365                 }
1366                 wfProfileOut( $fname );
1367                 return $text;
1368         }
1369
1370         /**
1371          * Change an existing article. Puts the previous version back into the old table, updates RC
1372          * and all necessary caches, mostly via the deferred update array.
1373          *
1374          * It is possible to call this function from a command-line script, but note that you should
1375          * first set $wgUser, and clean up $wgDeferredUpdates after each edit.
1376          */
1377         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1378                 global $wgUser, $wgDBtransactions, $wgUseSquid;
1379                 global $wgPostCommitUpdateList, $wgUseFileCache;
1380
1381                 $fname = 'Article::updateArticle';
1382                 wfProfileIn( $fname );
1383                 $good = true;
1384
1385                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1386                         &$summary, &$minor,
1387                         &$watchthis, &$sectionanchor ) ) ) {
1388                         wfDebug( "$fname: ArticleSave hook aborted save!\n" );
1389                         wfProfileOut( $fname );
1390                         return false;
1391                 }
1392
1393                 $isminor = $minor && $wgUser->isAllowed('minoredit');
1394
1395                 $text = $this->preSaveTransform( $text );
1396                 $dbw =& wfGetDB( DB_MASTER );
1397                 $now = wfTimestampNow();
1398
1399                 # Update article, but only if changed.
1400
1401                 # It's important that we either rollback or complete, otherwise an attacker could
1402                 # overwrite cur entries by sending precisely timed user aborts. Random bored users
1403                 # could conceivably have the same effect, especially if cur is locked for long periods.
1404                 if( !$wgDBtransactions ) {
1405                         $userAbort = ignore_user_abort( true );
1406                 }
1407
1408                 $oldtext = $this->getContent();
1409                 $oldsize = strlen( $oldtext );
1410                 $newsize = strlen( $text );
1411                 $lastRevision = 0;
1412                 $revisionId = 0;
1413
1414                 if ( 0 != strcmp( $text, $oldtext ) ) {
1415                         $this->mGoodAdjustment = (int)$this->isCountable( $text )
1416                           - (int)$this->isCountable( $oldtext );
1417                         $this->mTotalAdjustment = 0;
1418                         $now = wfTimestampNow();
1419
1420                         $lastRevision = $dbw->selectField(
1421                                 'page', 'page_latest', array( 'page_id' => $this->getId() ) );
1422
1423                         $revision = new Revision( array(
1424                                 'page'       => $this->getId(),
1425                                 'comment'    => $summary,
1426                                 'minor_edit' => $isminor,
1427                                 'text'       => $text
1428                                 ) );
1429
1430                         $dbw->immediateCommit();
1431                         $dbw->begin();
1432                         $revisionId = $revision->insertOn( $dbw );
1433
1434                         # Update page
1435                         $ok = $this->updateRevisionOn( $dbw, $revision, $lastRevision );
1436
1437                         if( !$ok ) {
1438                                 /* Belated edit conflict! Run away!! */
1439                                 $good = false;
1440                                 $dbw->rollback();
1441                         } else {
1442                                 # Update recentchanges and purge cache and whatnot
1443                                 require_once( 'RecentChange.php' );
1444                                 $bot = (int)($wgUser->isBot() || $forceBot);
1445                                 $rcid = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $wgUser, $summary,
1446                                         $lastRevision, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1447                                         $revisionId );
1448
1449                                 # Mark as patrolled if the user can do so and has it set in their options
1450                                 if( $wgUser->isAllowed( 'patrol' ) && $wgUser->getOption( 'autopatrol' ) ) {
1451                                         RecentChange::markPatrolled( $rcid );
1452                                 }
1453
1454                                 $dbw->commit();
1455
1456                                 // Update caches outside the main transaction
1457                                 Article::onArticleEdit( $this->mTitle );
1458                         }
1459                 } else {
1460                         // Keep the same revision ID, but do some updates on it
1461                         $revisionId = $this->getRevIdFetched();
1462                 }
1463
1464                 if( !$wgDBtransactions ) {
1465                         ignore_user_abort( $userAbort );
1466                 }
1467
1468                 if ( $good ) {
1469                         if ($watchthis) {
1470                                 if (!$this->mTitle->userIsWatching()) {
1471                                         $dbw->immediateCommit();
1472                                         $dbw->begin();
1473                                         $this->doWatch();
1474                                         $dbw->commit();
1475                                 }
1476                         } else {
1477                                 if ( $this->mTitle->userIsWatching() ) {
1478                                         $dbw->immediateCommit();
1479                                         $dbw->begin();
1480                                         $this->doUnwatch();
1481                                         $dbw->commit();
1482                                 }
1483                         }
1484                         # standard deferred updates
1485                         $this->editUpdates( $text, $summary, $minor, $now, $revisionId );
1486
1487
1488                         $urls = array();
1489                         # Invalidate caches of all articles using this article as a template
1490
1491                         # Template namespace
1492                         # Purge all articles linking here
1493                         $titles = $this->mTitle->getTemplateLinksTo();
1494                         Title::touchArray( $titles );
1495                         if ( $wgUseSquid ) {
1496                                         foreach ( $titles as $title ) {
1497                                                 $urls[] = $title->getInternalURL();
1498                                         }
1499                         }
1500
1501                         # Squid updates
1502                         if ( $wgUseSquid ) {
1503                                 $urls = array_merge( $urls, $this->mTitle->getSquidURLs() );
1504                                 $u = new SquidUpdate( $urls );
1505                                 array_push( $wgPostCommitUpdateList, $u );
1506                         }
1507
1508                         # File cache
1509                         if ( $wgUseFileCache ) {
1510                                 $cm = new CacheManager($this->mTitle);
1511                                 @unlink($cm->fileCacheName());
1512                         }
1513
1514                         $this->showArticle( $text, wfMsg( 'updated' ), $sectionanchor, $isminor, $now, $summary, $lastRevision );
1515                 }
1516                 wfRunHooks( 'ArticleSaveComplete',
1517                         array( &$this, &$wgUser, $text,
1518                         $summary, $minor,
1519                         $watchthis, $sectionanchor ) );
1520                 wfProfileOut( $fname );
1521                 return $good;
1522         }
1523
1524         /**
1525          * After we've either updated or inserted the article, update
1526          * the link tables and redirect to the new page.
1527          * @todo FIXME some function arguments never used
1528          */
1529         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1530                 global $wgOut;
1531
1532                 $fname = 'Article::showArticle';
1533                 wfProfileIn( $fname );
1534
1535                 # Output the redirect
1536                 if( $this->isRedirect( $text ) )
1537                         $r = 'redirect=no';
1538                 else
1539                         $r = '';
1540                 $wgOut->redirect( $this->mTitle->getFullURL( $r ).$sectionanchor );
1541
1542                 wfProfileOut( $fname );
1543         }
1544
1545         /**
1546          * Mark this particular edit as patrolled
1547          */
1548         function markpatrolled() {
1549                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUser;
1550                 $wgOut->setRobotpolicy( 'noindex,follow' );
1551
1552                 # Check RC patrol config. option
1553                 if( !$wgUseRCPatrol ) {
1554                         $wgOut->errorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1555                         return;
1556                 }
1557
1558                 # Check permissions
1559                 if( !$wgUser->isAllowed( 'patrol' ) ) {
1560                         $wgOut->permissionRequired( 'patrol' );
1561                         return;
1562                 }
1563
1564                 $rcid = $wgRequest->getVal( 'rcid' );
1565                 if ( !is_null ( $rcid ) ) {
1566                         if( wfRunHooks( 'MarkPatrolled', array( &$rcid, &$wgUser, false ) ) ) {
1567                                 require_once( 'RecentChange.php' );
1568                                 RecentChange::markPatrolled( $rcid );
1569                                 wfRunHooks( 'MarkPatrolledComplete', array( &$rcid, &$wgUser, false ) );
1570                                 $wgOut->setPagetitle( wfMsg( 'markedaspatrolled' ) );
1571                                 $wgOut->addWikiText( wfMsg( 'markedaspatrolledtext' ) );
1572                         }
1573                         $rcTitle = Title::makeTitle( NS_SPECIAL, 'Recentchanges' );
1574                         $wgOut->returnToMain( false, $rcTitle->getPrefixedText() );
1575                 }
1576                 else {
1577                         $wgOut->errorpage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1578                 }
1579         }
1580
1581         /**
1582          * User-interface handler for the "watch" action
1583          */
1584
1585         function watch() {
1586
1587                 global $wgUser, $wgOut;
1588
1589                 if ( $wgUser->isAnon() ) {
1590                         $wgOut->errorpage( 'watchnologin', 'watchnologintext' );
1591                         return;
1592                 }
1593                 if ( wfReadOnly() ) {
1594                         $wgOut->readOnlyPage();
1595                         return;
1596                 }
1597
1598                 if( $this->doWatch() ) {
1599                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1600                         $wgOut->setRobotpolicy( 'noindex,follow' );
1601
1602                         $link = $this->mTitle->getPrefixedText();
1603                         $text = wfMsg( 'addedwatchtext', $link );
1604                         $wgOut->addWikiText( $text );
1605                 }
1606
1607                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1608         }
1609
1610         /**
1611          * Add this page to $wgUser's watchlist
1612          * @return bool true on successful watch operation
1613          */
1614         function doWatch() {
1615                 global $wgUser;
1616                 if( $wgUser->isAnon() ) {
1617                         return false;
1618                 }
1619
1620                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1621                         $wgUser->addWatch( $this->mTitle );
1622                         $wgUser->saveSettings();
1623
1624                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1625                 }
1626
1627                 return false;
1628         }
1629
1630         /**
1631          * User interface handler for the "unwatch" action.
1632          */
1633         function unwatch() {
1634
1635                 global $wgUser, $wgOut;
1636
1637                 if ( $wgUser->isAnon() ) {
1638                         $wgOut->errorpage( 'watchnologin', 'watchnologintext' );
1639                         return;
1640                 }
1641                 if ( wfReadOnly() ) {
1642                         $wgOut->readOnlyPage();
1643                         return;
1644                 }
1645
1646                 if( $this->doUnwatch() ) {
1647                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1648                         $wgOut->setRobotpolicy( 'noindex,follow' );
1649
1650                         $link = $this->mTitle->getPrefixedText();
1651                         $text = wfMsg( 'removedwatchtext', $link );
1652                         $wgOut->addWikiText( $text );
1653                 }
1654
1655                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1656         }
1657
1658         /**
1659          * Stop watching a page
1660          * @return bool true on successful unwatch
1661          */
1662         function doUnwatch() {
1663                 global $wgUser;
1664                 if( $wgUser->isAnon() ) {
1665                         return false;
1666                 }
1667
1668                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1669                         $wgUser->removeWatch( $this->mTitle );
1670                         $wgUser->saveSettings();
1671
1672                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1673                 }
1674
1675                 return false;
1676         }
1677
1678         /**
1679          * action=protect handler
1680          */
1681         function protect() {
1682                 require_once 'ProtectionForm.php';
1683                 $form = new ProtectionForm( $this );
1684                 $form->show();
1685         }
1686
1687         /**
1688          * action=unprotect handler (alias)
1689          */
1690         function unprotect() {
1691                 $this->protect();
1692         }
1693
1694         /**
1695          * Update the article's restriction field, and leave a log entry.
1696          *
1697          * @param array $limit set of restriction keys
1698          * @param string $reason
1699          * @return bool true on success
1700          */
1701         function updateRestrictions( $limit = array(), $reason = '' ) {
1702                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1703
1704                 $id = $this->mTitle->getArticleID();
1705                 if( !$wgUser->isAllowed( 'protect' ) || wfReadOnly() || $id == 0 ) {
1706                         return false;
1707                 }
1708
1709                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1710                 # we expect a single selection, but the schema allows otherwise.
1711                 $current = array();
1712                 foreach( $wgRestrictionTypes as $action )
1713                         $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1714
1715                 $current = Article::flattenRestrictions( $current );
1716                 $updated = Article::flattenRestrictions( $limit );
1717
1718                 $changed = ( $current != $updated );
1719                 $protect = ( $updated != '' );
1720
1721                 # If nothing's changed, do nothing
1722                 if( $changed ) {
1723                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1724
1725                                 $dbw =& wfGetDB( DB_MASTER );
1726
1727                                 # Prepare a null revision to be added to the history
1728                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $protect ? 'protectedarticle' : 'unprotectedarticle', $this->mTitle->getPrefixedText() ) );
1729                                 if( $reason )
1730                                         $comment .= ": $reason";
1731                                 if( $protect )
1732                                         $comment .= " [$updated]";
1733                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $comment, true );
1734                                 $nullRevId = $nullRevision->insertOn( $dbw );
1735
1736                                 # Update page record
1737                                 $dbw->update( 'page',
1738                                         array( /* SET */
1739                                                 'page_touched' => $dbw->timestamp(),
1740                                                 'page_restrictions' => $updated,
1741                                                 'page_latest' => $nullRevId
1742                                         ), array( /* WHERE */
1743                                                 'page_id' => $id
1744                                         ), 'Article::protect'
1745                                 );
1746                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1747
1748                                 # Update the protection log
1749                                 $log = new LogPage( 'protect' );
1750                                 if( $protect ) {
1751                                         $log->addEntry( 'protect', $this->mTitle, trim( $reason . " [$updated]" ) );
1752                                 } else {
1753                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1754                                 }
1755
1756                         } # End hook
1757                 } # End "changed" check
1758
1759                 return true;
1760         }
1761
1762         /**
1763          * Take an array of page restrictions and flatten it to a string
1764          * suitable for insertion into the page_restrictions field.
1765          * @param array $limit
1766          * @return string
1767          * @private
1768          */
1769         function flattenRestrictions( $limit ) {
1770                 if( !is_array( $limit ) ) {
1771                         wfDebugDieBacktrace( 'Article::flattenRestrictions given non-array restriction set' );
1772                 }
1773                 $bits = array();
1774                 ksort( $limit );
1775                 foreach( $limit as $action => $restrictions ) {
1776                         if( $restrictions != '' ) {
1777                                 $bits[] = "$action=$restrictions";
1778                         }
1779                 }
1780                 return implode( ':', $bits );
1781         }
1782
1783         /*
1784          * UI entry point for page deletion
1785          */
1786         function delete() {
1787                 global $wgUser, $wgOut, $wgRequest;
1788                 $fname = 'Article::delete';
1789                 $confirm = $wgRequest->wasPosted() &&
1790                         $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1791                 $reason = $wgRequest->getText( 'wpReason' );
1792
1793                 # This code desperately needs to be totally rewritten
1794
1795                 # Check permissions
1796                 if( $wgUser->isAllowed( 'delete' ) ) {
1797                         if( $wgUser->isBlocked() ) {
1798                                 $wgOut->blockedPage();
1799                                 return;
1800                         }
1801                 } else {
1802                         $wgOut->permissionRequired( 'delete' );
1803                         return;
1804                 }
1805
1806                 if( wfReadOnly() ) {
1807                         $wgOut->readOnlyPage();
1808                         return;
1809                 }
1810
1811                 $wgOut->setPagetitle( wfMsg( 'confirmdelete' ) );
1812
1813                 # Better double-check that it hasn't been deleted yet!
1814                 $dbw =& wfGetDB( DB_MASTER );
1815                 $conds = $this->mTitle->pageCond();
1816                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, $fname );
1817                 if ( $latest === false ) {
1818                         $wgOut->fatalError( wfMsg( 'cannotdelete' ) );
1819                         return;
1820                 }
1821
1822                 if( $confirm ) {
1823                         $this->doDelete( $reason );
1824                         return;
1825                 }
1826
1827                 # determine whether this page has earlier revisions
1828                 # and insert a warning if it does
1829                 $maxRevisions = 20;
1830                 $authors = $this->getLastNAuthors( $maxRevisions, $latest );
1831
1832                 if( count( $authors ) > 1 && !$confirm ) {
1833                         $skin=$wgUser->getSkin();
1834                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
1835                 }
1836
1837                 # If a single user is responsible for all revisions, find out who they are
1838                 if ( count( $authors ) == $maxRevisions ) {
1839                         // Query bailed out, too many revisions to find out if they're all the same
1840                         $authorOfAll = false;
1841                 } else {
1842                         $authorOfAll = reset( $authors );
1843                         foreach ( $authors as $author ) {
1844                                 if ( $authorOfAll != $author ) {
1845                                         $authorOfAll = false;
1846                                         break;
1847                                 }
1848                         }
1849                 }
1850                 # Fetch article text
1851                 $rev = Revision::newFromTitle( $this->mTitle );
1852
1853                 if( !is_null( $rev ) ) {
1854                         # if this is a mini-text, we can paste part of it into the deletion reason
1855                         $text = $rev->getText();
1856
1857                         #if this is empty, an earlier revision may contain "useful" text
1858                         $blanked = false;
1859                         if( $text == '' ) {
1860                                 $prev = $rev->getPrevious();
1861                                 if( $prev ) {
1862                                         $text = $prev->getText();
1863                                         $blanked = true;
1864                                 }
1865                         }
1866
1867                         $length = strlen( $text );
1868
1869                         # this should not happen, since it is not possible to store an empty, new
1870                         # page. Let's insert a standard text in case it does, though
1871                         if( $length == 0 && $reason === '' ) {
1872                                 $reason = wfMsgForContent( 'exblank' );
1873                         }
1874
1875                         if( $length < 500 && $reason === '' ) {
1876                                 # comment field=255, let's grep the first 150 to have some user
1877                                 # space left
1878                                 global $wgContLang;
1879                                 $text = $wgContLang->truncate( $text, 150, '...' );
1880
1881                                 # let's strip out newlines
1882                                 $text = preg_replace( "/[\n\r]/", '', $text );
1883
1884                                 if( !$blanked ) {
1885                                         if( $authorOfAll === false ) {
1886                                                 $reason = wfMsgForContent( 'excontent', $text );
1887                                         } else {
1888                                                 $reason = wfMsgForContent( 'excontentauthor', $text, $authorOfAll );
1889                                         }
1890                                 } else {
1891                                         $reason = wfMsgForContent( 'exbeforeblank', $text );
1892                                 }
1893                         }
1894                 }
1895
1896                 return $this->confirmDelete( '', $reason );
1897         }
1898
1899         /**
1900          * Get the last N authors
1901          * @param int $num Number of revisions to get
1902          * @param string $revLatest The latest rev_id, selected from the master (optional)
1903          * @return array Array of authors, duplicates not removed
1904          */
1905         function getLastNAuthors( $num, $revLatest = 0 ) {
1906                 $fname = 'Article::getLastNAuthors';
1907                 wfProfileIn( $fname );
1908
1909                 // First try the slave
1910                 // If that doesn't have the latest revision, try the master
1911                 $continue = 2;
1912                 $db =& wfGetDB( DB_SLAVE );
1913                 do {
1914                         $res = $db->select( array( 'page', 'revision' ),
1915                                 array( 'rev_id', 'rev_user_text' ),
1916                                 array(
1917                                         'page_namespace' => $this->mTitle->getNamespace(),
1918                                         'page_title' => $this->mTitle->getDBkey(),
1919                                         'rev_page = page_id'
1920                                 ), $fname, $this->getSelectOptions( array(
1921                                         'ORDER BY' => 'rev_timestamp DESC',
1922                                         'LIMIT' => $num
1923                                 ) )
1924                         );
1925                         if ( !$res ) {
1926                                 wfProfileOut( $fname );
1927                                 return array();
1928                         }
1929                         $row = $db->fetchObject( $res );
1930                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1931                                 $db =& wfGetDB( DB_MASTER );
1932                                 $continue--;
1933                         } else {
1934                                 $continue = 0;
1935                         }
1936                 } while ( $continue );
1937
1938                 $authors = array( $row->rev_user_text );
1939                 while ( $row = $db->fetchObject( $res ) ) {
1940                         $authors[] = $row->rev_user_text;
1941                 }
1942                 wfProfileOut( $fname );
1943                 return $authors;
1944         }
1945
1946         /**
1947          * Output deletion confirmation dialog
1948          */
1949         function confirmDelete( $par, $reason ) {
1950                 global $wgOut, $wgUser;
1951
1952                 wfDebug( "Article::confirmDelete\n" );
1953
1954                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
1955                 $wgOut->setSubtitle( wfMsg( 'deletesub', $sub ) );
1956                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1957                 $wgOut->addWikiText( wfMsg( 'confirmdeletetext' ) );
1958
1959                 $formaction = $this->mTitle->escapeLocalURL( 'action=delete' . $par );
1960
1961                 $confirm = htmlspecialchars( wfMsg( 'deletepage' ) );
1962                 $delcom = htmlspecialchars( wfMsg( 'deletecomment' ) );
1963                 $token = htmlspecialchars( $wgUser->editToken() );
1964
1965                 $wgOut->addHTML( "
1966 <form id='deleteconfirm' method='post' action=\"{$formaction}\">
1967         <table border='0'>
1968                 <tr>
1969                         <td align='right'>
1970                                 <label for='wpReason'>{$delcom}:</label>
1971                         </td>
1972                         <td align='left'>
1973                                 <input type='text' size='60' name='wpReason' id='wpReason' value=\"" . htmlspecialchars( $reason ) . "\" />
1974                         </td>
1975                 </tr>
1976                 <tr>
1977                         <td>&nbsp;</td>
1978                         <td>
1979                                 <input type='submit' name='wpConfirmB' value=\"{$confirm}\" />
1980                         </td>
1981                 </tr>
1982         </table>
1983         <input type='hidden' name='wpEditToken' value=\"{$token}\" />
1984 </form>\n" );
1985
1986                 $wgOut->returnToMain( false );
1987         }
1988
1989
1990         /**
1991          * Perform a deletion and output success or failure messages
1992          */
1993         function doDelete( $reason ) {
1994                 global $wgOut, $wgUser;
1995                 $fname = 'Article::doDelete';
1996                 wfDebug( $fname."\n" );
1997
1998                 if (wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason))) {
1999                         if ( $this->doDeleteArticle( $reason ) ) {
2000                                 $deleted = $this->mTitle->getPrefixedText();
2001
2002                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2003                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2004
2005                                 $loglink = '[[Special:Log/delete|' . wfMsg( 'deletionlog' ) . ']]';
2006                                 $text = wfMsg( 'deletedtext', $deleted, $loglink );
2007
2008                                 $wgOut->addWikiText( $text );
2009                                 $wgOut->returnToMain( false );
2010                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason));
2011                         } else {
2012                                 $wgOut->fatalError( wfMsg( 'cannotdelete' ) );
2013                         }
2014                 }
2015         }
2016
2017         /**
2018          * Back-end article deletion
2019          * Deletes the article with database consistency, writes logs, purges caches
2020          * Returns success
2021          */
2022         function doDeleteArticle( $reason ) {
2023                 global $wgUseSquid, $wgDeferredUpdateList;
2024                 global $wgPostCommitUpdateList, $wgUseTrackbacks;
2025
2026                 $fname = 'Article::doDeleteArticle';
2027                 wfDebug( $fname."\n" );
2028
2029                 $dbw =& wfGetDB( DB_MASTER );
2030                 $ns = $this->mTitle->getNamespace();
2031                 $t = $this->mTitle->getDBkey();
2032                 $id = $this->mTitle->getArticleID();
2033
2034                 if ( $t == '' || $id == 0 ) {
2035                         return false;
2036                 }
2037
2038                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
2039                 array_push( $wgDeferredUpdateList, $u );
2040
2041                 $linksTo = $this->mTitle->getLinksTo();
2042
2043                 # Squid purging
2044                 if ( $wgUseSquid ) {
2045                         $urls = array(
2046                                 $this->mTitle->getInternalURL(),
2047                                 $this->mTitle->getInternalURL( 'history' )
2048                         );
2049
2050                         $u = SquidUpdate::newFromTitles( $linksTo, $urls );
2051                         array_push( $wgPostCommitUpdateList, $u );
2052
2053                 }
2054
2055                 # Client and file cache invalidation
2056                 Title::touchArray( $linksTo );
2057
2058
2059                 // For now, shunt the revision data into the archive table.
2060                 // Text is *not* removed from the text table; bulk storage
2061                 // is left intact to avoid breaking block-compression or
2062                 // immutable storage schemes.
2063                 //
2064                 // For backwards compatibility, note that some older archive
2065                 // table entries will have ar_text and ar_flags fields still.
2066                 //
2067                 // In the future, we may keep revisions and mark them with
2068                 // the rev_deleted field, which is reserved for this purpose.
2069                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2070                         array(
2071                                 'ar_namespace'  => 'page_namespace',
2072                                 'ar_title'      => 'page_title',
2073                                 'ar_comment'    => 'rev_comment',
2074                                 'ar_user'       => 'rev_user',
2075                                 'ar_user_text'  => 'rev_user_text',
2076                                 'ar_timestamp'  => 'rev_timestamp',
2077                                 'ar_minor_edit' => 'rev_minor_edit',
2078                                 'ar_rev_id'     => 'rev_id',
2079                                 'ar_text_id'    => 'rev_text_id',
2080                         ), array(
2081                                 'page_id' => $id,
2082                                 'page_id = rev_page'
2083                         ), $fname
2084                 );
2085
2086                 # Now that it's safely backed up, delete it
2087                 $dbw->delete( 'revision', array( 'rev_page' => $id ), $fname );
2088                 $dbw->delete( 'page', array( 'page_id' => $id ), $fname);
2089
2090                 if ($wgUseTrackbacks)
2091                         $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), $fname );
2092
2093                 # Clean up recentchanges entries...
2094                 $dbw->delete( 'recentchanges', array( 'rc_namespace' => $ns, 'rc_title' => $t ), $fname );
2095
2096                 # Finally, clean up the link tables
2097                 $t = $this->mTitle->getPrefixedDBkey();
2098
2099                 Article::onArticleDelete( $this->mTitle );
2100
2101                 # Delete outgoing links
2102                 $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2103                 $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2104                 $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2105                 $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2106                 $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2107                 $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2108
2109                 # Log the deletion
2110                 $log = new LogPage( 'delete' );
2111                 $log->addEntry( 'delete', $this->mTitle, $reason );
2112
2113                 # Clear the cached article id so the interface doesn't act like we exist
2114                 $this->mTitle->resetArticleID( 0 );
2115                 $this->mTitle->mArticleID = 0;
2116                 return true;
2117         }
2118
2119         /**
2120          * Revert a modification
2121          */
2122         function rollback() {
2123                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2124                 $fname = 'Article::rollback';
2125
2126                 if( $wgUser->isAllowed( 'rollback' ) ) {
2127                         if( $wgUser->isBlocked() ) {
2128                                 $wgOut->blockedPage();
2129                                 return;
2130                         }
2131                 } else {
2132                         $wgOut->permissionRequired( 'rollback' );
2133                         return;
2134                 }
2135
2136                 if ( wfReadOnly() ) {
2137                         $wgOut->readOnlyPage( $this->getContent() );
2138                         return;
2139                 }
2140                 if( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ),
2141                         array( $this->mTitle->getPrefixedText(),
2142                                 $wgRequest->getVal( 'from' ) )  ) ) {
2143                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2144                         $wgOut->addWikiText( wfMsg( 'sessionfailure' ) );
2145                         return;
2146                 }
2147                 $dbw =& wfGetDB( DB_MASTER );
2148
2149                 # Enhanced rollback, marks edits rc_bot=1
2150                 $bot = $wgRequest->getBool( 'bot' );
2151
2152                 # Replace all this user's current edits with the next one down
2153                 $tt = $this->mTitle->getDBKey();
2154                 $n = $this->mTitle->getNamespace();
2155
2156                 # Get the last editor, lock table exclusively
2157                 $dbw->begin();
2158                 $current = Revision::newFromTitle( $this->mTitle );
2159                 if( is_null( $current ) ) {
2160                         # Something wrong... no page?
2161                         $dbw->rollback();
2162                         $wgOut->addHTML( wfMsg( 'notanarticle' ) );
2163                         return;
2164                 }
2165
2166                 $from = str_replace( '_', ' ', $wgRequest->getVal( 'from' ) );
2167                 if( $from != $current->getUserText() ) {
2168                         $wgOut->setPageTitle( wfMsg('rollbackfailed') );
2169                         $wgOut->addWikiText( wfMsg( 'alreadyrolled',
2170                                 htmlspecialchars( $this->mTitle->getPrefixedText()),
2171                                 htmlspecialchars( $from ),
2172                                 htmlspecialchars( $current->getUserText() ) ) );
2173                         if( $current->getComment() != '') {
2174                                 $wgOut->addHTML(
2175                                         wfMsg( 'editcomment',
2176                                         htmlspecialchars( $current->getComment() ) ) );
2177                         }
2178                         return;
2179                 }
2180
2181                 # Get the last edit not by this guy
2182                 $user = intval( $current->getUser() );
2183                 $user_text = $dbw->addQuotes( $current->getUserText() );
2184                 $s = $dbw->selectRow( 'revision',
2185                         array( 'rev_id', 'rev_timestamp' ),
2186                         array(
2187                                 'rev_page' => $current->getPage(),
2188                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
2189                         ), $fname,
2190                         array(
2191                                 'USE INDEX' => 'page_timestamp',
2192                                 'ORDER BY'  => 'rev_timestamp DESC' )
2193                         );
2194                 if( $s === false ) {
2195                         # Something wrong
2196                         $dbw->rollback();
2197                         $wgOut->setPageTitle(wfMsg('rollbackfailed'));
2198                         $wgOut->addHTML( wfMsg( 'cantrollback' ) );
2199                         return;
2200                 }
2201
2202                 $set = array();
2203                 if ( $bot ) {
2204                         # Mark all reverted edits as bot
2205                         $set['rc_bot'] = 1;
2206                 }
2207                 if ( $wgUseRCPatrol ) {
2208                         # Mark all reverted edits as patrolled
2209                         $set['rc_patrolled'] = 1;
2210                 }
2211
2212                 if ( $set ) {
2213                         $dbw->update( 'recentchanges', $set,
2214                                 array( /* WHERE */
2215                                         'rc_cur_id'    => $current->getPage(),
2216                                         'rc_user_text' => $current->getUserText(),
2217                                         "rc_timestamp > '{$s->rev_timestamp}'",
2218                                 ), $fname
2219                         );
2220                 }
2221
2222                 # Get the edit summary
2223                 $target = Revision::newFromId( $s->rev_id );
2224                 $newComment = wfMsgForContent( 'revertpage', $target->getUserText(), $from );
2225                 $newComment = $wgRequest->getText( 'summary', $newComment );
2226
2227                 # Save it!
2228                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2229                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2230                 $wgOut->addHTML( '<h2>' . htmlspecialchars( $newComment ) . "</h2>\n<hr />\n" );
2231
2232                 $this->updateArticle( $target->getText(), $newComment, 1, $this->mTitle->userIsWatching(), $bot );
2233                 Article::onArticleEdit( $this->mTitle );
2234
2235                 $dbw->commit();
2236                 $wgOut->returnToMain( false );
2237         }
2238
2239
2240         /**
2241          * Do standard deferred updates after page view
2242          * @private
2243          */
2244         function viewUpdates() {
2245                 global $wgDeferredUpdateList;
2246
2247                 if ( 0 != $this->getID() ) {
2248                         global $wgDisableCounters;
2249                         if( !$wgDisableCounters ) {
2250                                 Article::incViewCount( $this->getID() );
2251                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2252                                 array_push( $wgDeferredUpdateList, $u );
2253                         }
2254                 }
2255
2256                 # Update newtalk / watchlist notification status
2257                 global $wgUser;
2258                 $wgUser->clearNotification( $this->mTitle );
2259         }
2260
2261         /**
2262          * Do standard deferred updates after page edit.
2263          * Every 1000th edit, prune the recent changes table.
2264          * @private
2265          * @param string $text
2266          */
2267         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid) {
2268                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser;
2269
2270                 $fname = 'Article::editUpdates';
2271                 wfProfileIn( $fname );
2272
2273                 # Parse the text
2274                 $options = new ParserOptions;
2275                 $options->setTidy(true);
2276                 $poutput = $wgParser->parse( $text, $this->mTitle, $options, true, true, $newid );
2277
2278                 # Save it to the parser cache
2279                 $parserCache =& ParserCache::singleton();
2280                 $parserCache->save( $poutput, $this, $wgUser );
2281
2282                 # Update the links tables
2283                 $u = new LinksUpdate( $this->mTitle, $poutput );
2284                 $u->doUpdate();
2285
2286                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2287                         wfSeedRandom();
2288                         if ( 0 == mt_rand( 0, 999 ) ) {
2289                                 # Periodically flush old entries from the recentchanges table.
2290                                 global $wgRCMaxAge;
2291
2292                                 $dbw =& wfGetDB( DB_MASTER );
2293                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2294                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2295                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2296                                 $dbw->query( $sql );
2297                         }
2298                 }
2299
2300                 $id = $this->getID();
2301                 $title = $this->mTitle->getPrefixedDBkey();
2302                 $shortTitle = $this->mTitle->getDBkey();
2303
2304                 if ( 0 == $id ) {
2305                         wfProfileOut( $fname );
2306                         return;
2307                 }
2308
2309                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2310                 array_push( $wgDeferredUpdateList, $u );
2311                 $u = new SearchUpdate( $id, $title, $text );
2312                 array_push( $wgDeferredUpdateList, $u );
2313
2314                 # If this is another user's talk page, update newtalk
2315
2316                 if ($this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getName()) {
2317                         if (wfRunHooks('ArticleEditUpdateNewTalk', array(&$this)) ) {
2318                                 $other = User::newFromName( $shortTitle );
2319                                 if( is_null( $other ) && User::isIP( $shortTitle ) ) {
2320                                         // An anonymous user
2321                                         $other = new User();
2322                                         $other->setName( $shortTitle );
2323                                 }
2324                                 if( $other ) {
2325                                         $other->setNewtalk( true );
2326                                 }
2327                         }
2328                 }
2329
2330                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2331                         $wgMessageCache->replace( $shortTitle, $text );
2332                 }
2333
2334                 wfProfileOut( $fname );
2335         }
2336
2337         /**
2338          * Generate the navigation links when browsing through an article revisions
2339          * It shows the information as:
2340          *   Revision as of \<date\>; view current revision
2341          *   \<- Previous version | Next Version -\>
2342          *
2343          * @private
2344          * @param string $oldid         Revision ID of this article revision
2345          */
2346         function setOldSubtitle( $oldid=0 ) {
2347                 global $wgLang, $wgOut, $wgUser;
2348
2349                 $current = ( $oldid == $this->mLatest );
2350                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2351                 $sk = $wgUser->getSkin();
2352                 $lnk = $current
2353                         ? wfMsg( 'currentrevisionlink' )
2354                         : $lnk = $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2355                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2356                 $prevlink = $prev
2357                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2358                         : wfMsg( 'previousrevision' );
2359                 $nextlink = $current
2360                         ? wfMsg( 'nextrevision' )
2361                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2362                 $r = wfMsg( 'revisionasofwithlink', $td, $lnk, $prevlink, $nextlink );
2363                 $wgOut->setSubtitle( $r );
2364         }
2365
2366         /**
2367          * This function is called right before saving the wikitext,
2368          * so we can do things like signatures and links-in-context.
2369          *
2370          * @param string $text
2371          */
2372         function preSaveTransform( $text ) {
2373                 global $wgParser, $wgUser;
2374                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2375         }
2376
2377         /* Caching functions */
2378
2379         /**
2380          * checkLastModified returns true if it has taken care of all
2381          * output to the client that is necessary for this request.
2382          * (that is, it has sent a cached version of the page)
2383          */
2384         function tryFileCache() {
2385                 static $called = false;
2386                 if( $called ) {
2387                         wfDebug( " tryFileCache() -- called twice!?\n" );
2388                         return;
2389                 }
2390                 $called = true;
2391                 if($this->isFileCacheable()) {
2392                         $touched = $this->mTouched;
2393                         $cache = new CacheManager( $this->mTitle );
2394                         if($cache->isFileCacheGood( $touched )) {
2395                                 wfDebug( " tryFileCache() - about to load\n" );
2396                                 $cache->loadFromFileCache();
2397                                 return true;
2398                         } else {
2399                                 wfDebug( " tryFileCache() - starting buffer\n" );
2400                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2401                         }
2402                 } else {
2403                         wfDebug( " tryFileCache() - not cacheable\n" );
2404                 }
2405         }
2406
2407         /**
2408          * Check if the page can be cached
2409          * @return bool
2410          */
2411         function isFileCacheable() {
2412                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest;
2413                 extract( $wgRequest->getValues( 'action', 'oldid', 'diff', 'redirect', 'printable' ) );
2414
2415                 return $wgUseFileCache
2416                         and (!$wgShowIPinHeader)
2417                         and ($this->getID() != 0)
2418                         and ($wgUser->isAnon())
2419                         and (!$wgUser->getNewtalk())
2420                         and ($this->mTitle->getNamespace() != NS_SPECIAL )
2421                         and (empty( $action ) || $action == 'view')
2422                         and (!isset($oldid))
2423                         and (!isset($diff))
2424                         and (!isset($redirect))
2425                         and (!isset($printable))
2426                         and (!$this->mRedirectedFrom);
2427         }
2428
2429         /**
2430          * Loads page_touched and returns a value indicating if it should be used
2431          *
2432          */
2433         function checkTouched() {
2434                 $fname = 'Article::checkTouched';
2435                 if( !$this->mDataLoaded ) {
2436                         $this->loadPageData();
2437                 }
2438                 return !$this->mIsRedirect;
2439         }
2440
2441         /**
2442          * Get the page_touched field
2443          */
2444         function getTouched() {
2445                 # Ensure that page data has been loaded
2446                 if( !$this->mDataLoaded ) {
2447                         $this->loadPageData();
2448                 }
2449                 return $this->mTouched;
2450         }
2451
2452         /**
2453          * Get the page_latest field
2454          */
2455         function getLatest() {
2456                 if ( !$this->mDataLoaded ) {
2457                         $this->loadPageData();
2458                 }
2459                 return $this->mLatest;
2460         }
2461
2462         /**
2463          * Edit an article without doing all that other stuff
2464          * The article must already exist; link tables etc
2465          * are not updated, caches are not flushed.
2466          *
2467          * @param string $text text submitted
2468          * @param string $comment comment submitted
2469          * @param bool $minor whereas it's a minor modification
2470          */
2471         function quickEdit( $text, $comment = '', $minor = 0 ) {
2472                 $fname = 'Article::quickEdit';
2473                 wfProfileIn( $fname );
2474
2475                 $dbw =& wfGetDB( DB_MASTER );
2476                 $dbw->begin();
2477                 $revision = new Revision( array(
2478                         'page'       => $this->getId(),
2479                         'text'       => $text,
2480                         'comment'    => $comment,
2481                         'minor_edit' => $minor ? 1 : 0,
2482                         ) );
2483                 # fixme : $revisionId never used
2484                 $revisionId = $revision->insertOn( $dbw );
2485                 $this->updateRevisionOn( $dbw, $revision );
2486                 $dbw->commit();
2487
2488                 wfProfileOut( $fname );
2489         }
2490
2491         /**
2492          * Used to increment the view counter
2493          *
2494          * @static
2495          * @param integer $id article id
2496          */
2497         function incViewCount( $id ) {
2498                 $id = intval( $id );
2499                 global $wgHitcounterUpdateFreq, $wgDBtype;
2500
2501                 $dbw =& wfGetDB( DB_MASTER );
2502                 $pageTable = $dbw->tableName( 'page' );
2503                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
2504                 $acchitsTable = $dbw->tableName( 'acchits' );
2505
2506                 if( $wgHitcounterUpdateFreq <= 1 ){ //
2507                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
2508                         return;
2509                 }
2510
2511                 # Not important enough to warrant an error page in case of failure
2512                 $oldignore = $dbw->ignoreErrors( true );
2513
2514                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
2515
2516                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
2517                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
2518                         # Most of the time (or on SQL errors), skip row count check
2519                         $dbw->ignoreErrors( $oldignore );
2520                         return;
2521                 }
2522
2523                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
2524                 $row = $dbw->fetchObject( $res );
2525                 $rown = intval( $row->n );
2526                 if( $rown >= $wgHitcounterUpdateFreq ){
2527                         wfProfileIn( 'Article::incViewCount-collect' );
2528                         $old_user_abort = ignore_user_abort( true );
2529
2530                         if ($wgDBtype == 'mysql')
2531                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
2532                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
2533                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype".
2534                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
2535                                 'GROUP BY hc_id');
2536                         $dbw->query("DELETE FROM $hitcounterTable");
2537                         if ($wgDBtype == 'mysql')
2538                                 $dbw->query('UNLOCK TABLES');
2539                         $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
2540                                 'WHERE page_id = hc_id');
2541                         $dbw->query("DROP TABLE $acchitsTable");
2542
2543                         ignore_user_abort( $old_user_abort );
2544                         wfProfileOut( 'Article::incViewCount-collect' );
2545                 }
2546                 $dbw->ignoreErrors( $oldignore );
2547         }
2548
2549         /**#@+
2550          * The onArticle*() functions are supposed to be a kind of hooks
2551          * which should be called whenever any of the specified actions
2552          * are done.
2553          *
2554          * This is a good place to put code to clear caches, for instance.
2555          *
2556          * This is called on page move and undelete, as well as edit
2557          * @static
2558          * @param $title_obj a title object
2559          */
2560
2561         function onArticleCreate($title_obj) {
2562                 global $wgUseSquid, $wgPostCommitUpdateList;
2563
2564                 $title_obj->touchLinks();
2565                 $titles = $title_obj->getLinksTo();
2566
2567                 # Purge squid
2568                 if ( $wgUseSquid ) {
2569                         $urls = $title_obj->getSquidURLs();
2570                         foreach ( $titles as $linkTitle ) {
2571                                 $urls[] = $linkTitle->getInternalURL();
2572                         }
2573                         $u = new SquidUpdate( $urls );
2574                         array_push( $wgPostCommitUpdateList, $u );
2575                 }
2576         }
2577
2578         function onArticleDelete( $title ) {
2579                 global $wgMessageCache;
2580
2581                 $title->touchLinks();
2582
2583                 if( $title->getNamespace() == NS_MEDIAWIKI) {
2584                         $wgMessageCache->replace( $title->getDBkey(), false );
2585                 }
2586         }
2587
2588         /**
2589          * Purge caches on page update etc
2590          */
2591         function onArticleEdit( $title ) {
2592                 global $wgUseSquid, $wgPostCommitUpdateList, $wgUseFileCache;
2593
2594                 $urls = array();
2595
2596                 // Template namespace? Purge all articles linking here.
2597                 // FIXME: When a templatelinks table arrives, use it for all includes.
2598                 if ( $title->getNamespace() == NS_TEMPLATE) {
2599                         $titles = $title->getLinksTo();
2600                         Title::touchArray( $titles );
2601                         if ( $wgUseSquid ) {
2602                                 foreach ( $titles as $link ) {
2603                                         $urls[] = $link->getInternalURL();
2604                                 }
2605                         }
2606                 }
2607
2608                 # Squid updates
2609                 if ( $wgUseSquid ) {
2610                         $urls = array_merge( $urls, $title->getSquidURLs() );
2611                         $u = new SquidUpdate( $urls );
2612                         array_push( $wgPostCommitUpdateList, $u );
2613                 }
2614
2615                 # File cache
2616                 if ( $wgUseFileCache ) {
2617                         $cm = new CacheManager( $title );
2618                         @unlink( $cm->fileCacheName() );
2619                 }
2620         }
2621
2622         /**#@-*/
2623
2624         /**
2625          * Info about this page
2626          * Called for ?action=info when $wgAllowPageInfo is on.
2627          *
2628          * @public
2629          */
2630         function info() {
2631                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
2632                 $fname = 'Article::info';
2633
2634                 if ( !$wgAllowPageInfo ) {
2635                         $wgOut->errorpage( 'nosuchaction', 'nosuchactiontext' );
2636                         return;
2637                 }
2638
2639                 $page = $this->mTitle->getSubjectPage();
2640
2641                 $wgOut->setPagetitle( $page->getPrefixedText() );
2642                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ));
2643
2644                 # first, see if the page exists at all.
2645                 $exists = $page->getArticleId() != 0;
2646                 if( !$exists ) {
2647                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2648                                 $wgOut->addHTML(wfMsgWeirdKey ( $this->mTitle->getText() ) );
2649                         } else {
2650                                 $wgOut->addHTML(wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' ) );
2651                         }
2652                 } else {
2653                         $dbr =& wfGetDB( DB_SLAVE );
2654                         $wl_clause = array(
2655                                 'wl_title'     => $page->getDBkey(),
2656                                 'wl_namespace' => $page->getNamespace() );
2657                         $numwatchers = $dbr->selectField(
2658                                 'watchlist',
2659                                 'COUNT(*)',
2660                                 $wl_clause,
2661                                 $fname,
2662                                 $this->getSelectOptions() );
2663
2664                         $pageInfo = $this->pageCountInfo( $page );
2665                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
2666
2667                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
2668                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
2669                         if( $talkInfo ) {
2670                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
2671                         }
2672                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
2673                         if( $talkInfo ) {
2674                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
2675                         }
2676                         $wgOut->addHTML( '</ul>' );
2677
2678                 }
2679         }
2680
2681         /**
2682          * Return the total number of edits and number of unique editors
2683          * on a given page. If page does not exist, returns false.
2684          *
2685          * @param Title $title
2686          * @return array
2687          * @private
2688          */
2689         function pageCountInfo( $title ) {
2690                 $id = $title->getArticleId();
2691                 if( $id == 0 ) {
2692                         return false;
2693                 }
2694
2695                 $dbr =& wfGetDB( DB_SLAVE );
2696
2697                 $rev_clause = array( 'rev_page' => $id );
2698                 $fname = 'Article::pageCountInfo';
2699
2700                 $edits = $dbr->selectField(
2701                         'revision',
2702                         'COUNT(rev_page)',
2703                         $rev_clause,
2704                         $fname,
2705                         $this->getSelectOptions() );
2706
2707                 $authors = $dbr->selectField(
2708                         'revision',
2709                         'COUNT(DISTINCT rev_user_text)',
2710                         $rev_clause,
2711                         $fname,
2712                         $this->getSelectOptions() );
2713
2714                 return array( 'edits' => $edits, 'authors' => $authors );
2715         }
2716
2717         /**
2718          * Return a list of templates used by this article.
2719          * Uses the templatelinks table
2720          *
2721          * @return array Array of Title objects
2722          */
2723         function getUsedTemplates() {
2724                 $result = array();
2725                 $id = $this->mTitle->getArticleID();
2726                 if( $id == 0 ) {
2727                         return array();
2728                 }
2729
2730                 $dbr =& wfGetDB( DB_SLAVE );
2731                 $res = $dbr->select( array( 'templatelinks' ),
2732                         array( 'tl_namespace', 'tl_title' ),
2733                         array( 'tl_from' => $id ),
2734                         'Article:getUsedTemplates' );
2735                 if ( false !== $res ) {
2736                         if ( $dbr->numRows( $res ) ) {
2737                                 while ( $row = $dbr->fetchObject( $res ) ) {
2738                                         $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2739                                 }
2740                         }
2741                 }
2742                 $dbr->freeResult( $res );
2743                 return $result;
2744         }
2745 }
2746
2747 ?>