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         private $mComment;                      //!<
  30         private $mContent;                      //!<
  31         private $mContentLoaded;        //!<
  32         private $mCounter;                      //!<
  33         private $mFileCache;            //!<
  34         private $mForUpdate;            //!<
  35         private $mGoodAdjustment;       //!<
  36         private $mId;                           //!<
  37         private $mLatest;                       //!<
  38         private $mMinorEdit;            //!<
  39         private $mOldId;                        //!<
  40         private $mRedirectedFrom;       //!<
  41         private $mRedirectUrl;          //!<
  42         private $mRevIdFetched;         //!<
  43         private $mRevision;                     //!<
  44         private $mTable;                        //!<
  45         private $mTimestamp;            //!<
  46         private $mTotalAdjustment;      //!<
  47         private $mUser;                         //!<
  48         private $mUserText;                     //!<
  49         /**@}}*/
  50
  51         public  $mTitle;                        //!<
  52         public  $mTouched;                      //!<
  53
  54
  55         /**
  56          * Constructor and clear the article
  57          * @param $title Reference to a Title object.
  58          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  59          */
  60         function Article( &$title, $oldId = null ) {
  61                 $this->mTitle =& $title;
  62                 $this->mOldId = $oldId;
  63                 $this->clear();
  64         }
  65
  66         /**
  67          * Tell the page view functions that this view was redirected
  68          * from another page on the wiki.
  69          * @param $from Title object.
  70          */
  71         function setRedirectedFrom( $from ) {
  72                 $this->mRedirectedFrom = $from;
  73         }
  74
  75         /**
  76          * @return mixed false, Title of in-wiki target, or string with URL
  77          */
  78         function followRedirect() {
  79                 $text = $this->getContent();
  80                 $rt = Title::newFromRedirect( $text );
  81
  82                 # process if title object is valid and not special:userlogout
  83                 if( $rt ) {
  84                         if( $rt->getInterwiki() != '' ) {
  85                                 if( $rt->isLocal() ) {
  86                                         // Offsite wikis need an HTTP redirect.
  87                                         //
  88                                         // This can be hard to reverse and may produce loops,
  89                                         // so they may be disabled in the site configuration.
  90
  91                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
  92                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
  93                                 }
  94                         } else {
  95                                 if( $rt->getNamespace() == NS_SPECIAL ) {
  96                                         // Gotta hand redirects to special pages differently:
  97                                         // Fill the HTTP response "Location" header and ignore
  98                                         // the rest of the page we're on.
  99                                         //
 100                                         // This can be hard to reverse, so they may be disabled.
 101
 102                                         if( $rt->getNamespace() == NS_SPECIAL && $rt->getText() == 'Userlogout' ) {
 103                                                 // rolleyes
 104                                         } else {
 105                                                 return $rt->getFullURL();
 106                                         }
 107                                 }
 108                                 return $rt;
 109                         }
 110                 }
 111
 112                 // No or invalid redirect
 113                 return false;
 114         }
 115
 116         /**
 117          * get the title object of the article
 118          */
 119         function getTitle() {
 120                 return $this->mTitle;
 121         }
 122
 123         /**
 124           * Clear the object
 125           * @private
 126           */
 127         function clear() {
 128                 $this->mDataLoaded    = false;
 129                 $this->mContentLoaded = false;
 130
 131                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 132                 $this->mRedirectedFrom = null; # Title object if set
 133                 $this->mUserText =
 134                 $this->mTimestamp = $this->mComment = $this->mFileCache = '';
 135                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 136                 $this->mTouched = '19700101000000';
 137                 $this->mForUpdate = false;
 138                 $this->mIsRedirect = false;
 139                 $this->mRevIdFetched = 0;
 140                 $this->mRedirectUrl = false;
 141                 $this->mLatest = false;
 142         }
 143
 144         /**
 145          * Note that getContent/loadContent do not follow redirects anymore.
 146          * If you need to fetch redirectable content easily, try
 147          * the shortcut in Article::followContent()
 148          * FIXME
 149          * @todo There are still side-effects in this!
 150          *        In general, you should use the Revision class, not Article,
 151          *        to fetch text for purposes other than page views.
 152          *
 153          * @return Return the text of this revision
 154         */
 155         function getContent() {
 156                 global $wgRequest, $wgUser, $wgOut;
 157
 158                 # Get variables from query string :P
 159                 $action = $wgRequest->getText( 'action', 'view' );
 160                 $section = $wgRequest->getText( 'section' );
 161                 $preload = $wgRequest->getText( 'preload' );
 162
 163                 $fname =  'Article::getContent';
 164                 wfProfileIn( $fname );
 165
 166                 if ( 0 == $this->getID() ) {
 167                         if ( 'edit' == $action ) {
 168                                 wfProfileOut( $fname );
 169
 170                                 # If requested, preload some text.
 171                                 $text=$this->getPreloadedText($preload);
 172
 173                                 # We used to put MediaWiki:Newarticletext here if
 174                                 # $text was empty at this point.
 175                                 # This is now shown above the edit box instead.
 176                                 return $text;
 177                         }
 178                         wfProfileOut( $fname );
 179                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 180
 181                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 182                                 $ret = wfMsgWeirdKey ( $this->mTitle->getText() ) ;
 183                         } else {
 184                                 $ret = wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' );
 185                         }
 186
 187                         return "<div class='noarticletext'>$ret</div>";
 188                 } else {
 189                         $this->loadContent();
 190                         if($action=='edit') {
 191                                 if($section!='') {
 192                                         if($section=='new') {
 193                                                 wfProfileOut( $fname );
 194                                                 $text=$this->getPreloadedText($preload);
 195                                                 return $text;
 196                                         }
 197
 198                                         # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
 199                                         # comments to be stripped as well)
 200                                         $rv=$this->getSection($this->mContent,$section);
 201                                         wfProfileOut( $fname );
 202                                         return $rv;
 203                                 }
 204                         }
 205                         wfProfileOut( $fname );
 206                         return $this->mContent;
 207                 }
 208         }
 209
 210         /**
 211          * Get the contents of a page from its title and remove includeonly tags
 212          *
 213          * @param $preload String: the title of the page.
 214          * @return string The contents of the page.
 215          */
 216         function getPreloadedText($preload) {
 217                 if ( $preload === '' )
 218                         return '';
 219                 else {
 220                         $preloadTitle = Title::newFromText( $preload );
 221                         if ( isset( $preloadTitle ) && $preloadTitle->userCanRead() ) {
 222                                 $rev=Revision::newFromTitle($preloadTitle);
 223                                 if ( is_object( $rev ) ) {
 224                                         $text = $rev->getText();
 225                                         // TODO FIXME: AAAAAAAAAAA, this shouldn't be implementing
 226                                         // its own mini-parser! -ævar
 227                                         $text = preg_replace( '~</?includeonly>~', '', $text );
 228                                         return $text;
 229                                 } else
 230                                         return '';
 231                         }
 232                 }
 233         }
 234
 235         /**
 236          * This function returns the text of a section, specified by a number ($section).
 237          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 238          * the first section before any such heading (section 0).
 239          *
 240          * If a section contains subsections, these are also returned.
 241          *
 242          * @param $text String: text to look in
 243          * @param $section Integer: section number
 244          * @return string text of the requested section
 245          */
 246         function getSection($text,$section) {
 247
 248                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
 249                 # comments to be stripped as well)
 250                 $striparray=array();
 251                 $parser=new Parser();
 252                 $parser->mOutputType=OT_WIKI;
 253                 $parser->mOptions = new ParserOptions();
 254                 $striptext=$parser->strip($text, $striparray, true);
 255
 256                 # now that we can be sure that no pseudo-sections are in the source,
 257                 # split it up by section
 258                 $secs =
 259                   preg_split(
 260                   '/(^=+.+?=+|^<h[1-6].*?>.*?<\/h[1-6].*?>)(?!\S)/mi',
 261                   $striptext, -1,
 262                   PREG_SPLIT_DELIM_CAPTURE);
 263                 if($section==0) {
 264                         $rv=$secs[0];
 265                 } else {
 266                         $headline=$secs[$section*2-1];
 267                         preg_match( '/^(=+).+?=+|^<h([1-6]).*?>.*?<\/h[1-6].*?>(?!\S)/mi',$headline,$matches);
 268                         $hlevel=$matches[1];
 269
 270                         # translate wiki heading into level
 271                         if(strpos($hlevel,'=')!==false) {
 272                                 $hlevel=strlen($hlevel);
 273                         }
 274
 275                         $rv=$headline. $secs[$section*2];
 276                         $count=$section+1;
 277
 278                         $break=false;
 279                         while(!empty($secs[$count*2-1]) && !$break) {
 280
 281                                 $subheadline=$secs[$count*2-1];
 282                                 preg_match( '/^(=+).+?=+|^<h([1-6]).*?>.*?<\/h[1-6].*?>(?!\S)/mi',$subheadline,$matches);
 283                                 $subhlevel=$matches[1];
 284                                 if(strpos($subhlevel,'=')!==false) {
 285                                         $subhlevel=strlen($subhlevel);
 286                                 }
 287                                 if($subhlevel > $hlevel) {
 288                                         $rv.=$subheadline.$secs[$count*2];
 289                                 }
 290                                 if($subhlevel <= $hlevel) {
 291                                         $break=true;
 292                                 }
 293                                 $count++;
 294
 295                         }
 296                 }
 297                 # reinsert stripped tags
 298                 $rv=$parser->unstrip($rv,$striparray);
 299                 $rv=$parser->unstripNoWiki($rv,$striparray);
 300                 $rv=trim($rv);
 301                 return $rv;
 302
 303         }
 304
 305         /**
 306          * @return int The oldid of the article that is to be shown, 0 for the
 307          *             current revision
 308          */
 309         function getOldID() {
 310                 if ( is_null( $this->mOldId ) ) {
 311                         $this->mOldId = $this->getOldIDFromRequest();
 312                 }
 313                 return $this->mOldId;
 314         }
 315
 316         /**
 317          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 318          *
 319          * @return int The old id for the request
 320          */
 321         function getOldIDFromRequest() {
 322                 global $wgRequest;
 323                 $this->mRedirectUrl = false;
 324                 $oldid = $wgRequest->getVal( 'oldid' );
 325                 if ( isset( $oldid ) ) {
 326                         $oldid = intval( $oldid );
 327                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 328                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 329                                 if ( $nextid  ) {
 330                                         $oldid = $nextid;
 331                                 } else {
 332                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 333                                 }
 334                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 335                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 336                                 if ( $previd ) {
 337                                         $oldid = $previd;
 338                                 } else {
 339                                         # TODO
 340                                 }
 341                         }
 342                         # unused:
 343                         # $lastid = $oldid;
 344                 }
 345                 if ( !$oldid ) {
 346                         $oldid = 0;
 347                 }
 348                 return $oldid;
 349         }
 350
 351         /**
 352          * Load the revision (including text) into this object
 353          */
 354         function loadContent() {
 355                 if ( $this->mContentLoaded ) return;
 356
 357                 # Query variables :P
 358                 $oldid = $this->getOldID();
 359
 360                 # Pre-fill content with error message so that if something
 361                 # fails we'll have something telling us what we intended.
 362
 363                 $t = $this->mTitle->getPrefixedText();
 364
 365                 $this->mOldId = $oldid;
 366                 $this->fetchContent( $oldid );
 367         }
 368
 369
 370         /**
 371          * Fetch a page record with the given conditions
 372          * @param Database $dbr
 373          * @param array    $conditions
 374          * @private
 375          */
 376         function pageData( &$dbr, $conditions ) {
 377                 $fields = array(
 378                                 'page_id',
 379                                 'page_namespace',
 380                                 'page_title',
 381                                 'page_restrictions',
 382                                 'page_counter',
 383                                 'page_is_redirect',
 384                                 'page_is_new',
 385                                 'page_random',
 386                                 'page_touched',
 387                                 'page_latest',
 388                                 'page_len' ) ;
 389                 wfRunHooks( 'ArticlePageDataBefore', array( &$this , &$fields ) )       ;
 390                 $row = $dbr->selectRow( 'page',
 391                         $fields,
 392                         $conditions,
 393                         'Article::pageData' );
 394                 wfRunHooks( 'ArticlePageDataAfter', array( &$this , &$row ) )   ;
 395                 return $row ;
 396         }
 397
 398         /**
 399          * @param Database $dbr
 400          * @param Title $title
 401          */
 402         function pageDataFromTitle( &$dbr, $title ) {
 403                 return $this->pageData( $dbr, array(
 404                         'page_namespace' => $title->getNamespace(),
 405                         'page_title'     => $title->getDBkey() ) );
 406         }
 407
 408         /**
 409          * @param Database $dbr
 410          * @param int $id
 411          */
 412         function pageDataFromId( &$dbr, $id ) {
 413                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 414         }
 415
 416         /**
 417          * Set the general counter, title etc data loaded from
 418          * some source.
 419          *
 420          * @param object $data
 421          * @private
 422          */
 423         function loadPageData( $data = 'fromdb' ) {
 424                 if ( $data === 'fromdb' ) {
 425                         $dbr =& $this->getDB();
 426                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 427                 }
 428
 429                 $lc =& LinkCache::singleton();
 430                 if ( $data ) {
 431                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle );
 432
 433                         $this->mTitle->mArticleID = $data->page_id;
 434                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 435                         $this->mTitle->mRestrictionsLoaded = true;
 436
 437                         $this->mCounter     = $data->page_counter;
 438                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 439                         $this->mIsRedirect  = $data->page_is_redirect;
 440                         $this->mLatest      = $data->page_latest;
 441                 } else {
 442                         if ( is_object( $this->mTitle ) ) {
 443                                 $lc->addBadLinkObj( $this->mTitle );
 444                         }
 445                         $this->mTitle->mArticleID = 0;
 446                 }
 447
 448                 $this->mDataLoaded  = true;
 449         }
 450
 451         /**
 452          * Get text of an article from database
 453          * Does *NOT* follow redirects.
 454          * @param int $oldid 0 for whatever the latest revision is
 455          * @return string
 456          */
 457         function fetchContent( $oldid = 0 ) {
 458                 if ( $this->mContentLoaded ) {
 459                         return $this->mContent;
 460                 }
 461
 462                 $dbr =& $this->getDB();
 463                 $fname = 'Article::fetchContent';
 464
 465                 # Pre-fill content with error message so that if something
 466                 # fails we'll have something telling us what we intended.
 467                 $t = $this->mTitle->getPrefixedText();
 468                 if( $oldid ) {
 469                         $t .= ',oldid='.$oldid;
 470                 }
 471                 $this->mContent = wfMsg( 'missingarticle', $t ) ;
 472
 473                 if( $oldid ) {
 474                         $revision = Revision::newFromId( $oldid );
 475                         if( is_null( $revision ) ) {
 476                                 wfDebug( "$fname failed to retrieve specified revision, id $oldid\n" );
 477                                 return false;
 478                         }
 479                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 480                         if( !$data ) {
 481                                 wfDebug( "$fname failed to get page data linked to revision id $oldid\n" );
 482                                 return false;
 483                         }
 484                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 485                         $this->loadPageData( $data );
 486                 } else {
 487                         if( !$this->mDataLoaded ) {
 488                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 489                                 if( !$data ) {
 490                                         wfDebug( "$fname failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 491                                         return false;
 492                                 }
 493                                 $this->loadPageData( $data );
 494                         }
 495                         $revision = Revision::newFromId( $this->mLatest );
 496                         if( is_null( $revision ) ) {
 497                                 wfDebug( "$fname failed to retrieve current page, rev_id {$data->page_latest}\n" );
 498                                 return false;
 499                         }
 500                 }
 501
 502                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 503                 // We should instead work with the Revision object when we need it...
 504                 $this->mContent = $revision->userCan( MW_REV_DELETED_TEXT ) ? $revision->getRawText() : "";
 505                 //$this->mContent   = $revision->getText();
 506
 507                 $this->mUser      = $revision->getUser();
 508                 $this->mUserText  = $revision->getUserText();
 509                 $this->mComment   = $revision->getComment();
 510                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 511
 512                 $this->mRevIdFetched = $revision->getID();
 513                 $this->mContentLoaded = true;
 514                 $this->mRevision =& $revision;
 515
 516                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 517
 518                 return $this->mContent;
 519         }
 520
 521         /**
 522          * Read/write accessor to select FOR UPDATE
 523          *
 524          * @param $x Mixed: FIXME
 525          */
 526         function forUpdate( $x = NULL ) {
 527                 return wfSetVar( $this->mForUpdate, $x );
 528         }
 529
 530         /**
 531          * Get the database which should be used for reads
 532          *
 533          * @return Database
 534          */
 535         function &getDB() {
 536                 $ret =& wfGetDB( DB_MASTER );
 537                 return $ret;
 538         }
 539
 540         /**
 541          * Get options for all SELECT statements
 542          *
 543          * @param $options Array: an optional options array which'll be appended to
 544          *                       the default
 545          * @return Array: options
 546          */
 547         function getSelectOptions( $options = '' ) {
 548                 if ( $this->mForUpdate ) {
 549                         if ( is_array( $options ) ) {
 550                                 $options[] = 'FOR UPDATE';
 551                         } else {
 552                                 $options = 'FOR UPDATE';
 553                         }
 554                 }
 555                 return $options;
 556         }
 557
 558         /**
 559          * @return int Page ID
 560          */
 561         function getID() {
 562                 if( $this->mTitle ) {
 563                         return $this->mTitle->getArticleID();
 564                 } else {
 565                         return 0;
 566                 }
 567         }
 568
 569         /**
 570          * @return bool Whether or not the page exists in the database
 571          */
 572         function exists() {
 573                 return $this->getId() != 0;
 574         }
 575
 576         /**
 577          * @return int The view count for the page
 578          */
 579         function getCount() {
 580                 if ( -1 == $this->mCounter ) {
 581                         $id = $this->getID();
 582                         if ( $id == 0 ) {
 583                                 $this->mCounter = 0;
 584                         } else {
 585                                 $dbr =& wfGetDB( DB_SLAVE );
 586                                 $this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
 587                                         'Article::getCount', $this->getSelectOptions() );
 588                         }
 589                 }
 590                 return $this->mCounter;
 591         }
 592
 593         /**
 594          * Determine whether a page  would be suitable for being counted as an
 595          * article in the site_stats table based on the title & its content
 596          *
 597          * @param $text String: text to analyze
 598          * @return bool
 599          */
 600         function isCountable( $text ) {
 601                 global $wgUseCommaCount;
 602
 603                 $token = $wgUseCommaCount ? ',' : '[[';
 604                 return
 605                         $this->mTitle->getNamespace() == NS_MAIN
 606                         && ! $this->isRedirect( $text )
 607                         && in_string( $token, $text );
 608         }
 609
 610         /**
 611          * Tests if the article text represents a redirect
 612          *
 613          * @param $text String: FIXME
 614          * @return bool
 615          */
 616         function isRedirect( $text = false ) {
 617                 if ( $text === false ) {
 618                         $this->loadContent();
 619                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 620                 } else {
 621                         $titleObj = Title::newFromRedirect( $text );
 622                 }
 623                 return $titleObj !== NULL;
 624         }
 625
 626         /**
 627          * Returns true if the currently-referenced revision is the current edit
 628          * to this page (and it exists).
 629          * @return bool
 630          */
 631         function isCurrent() {
 632                 return $this->exists() &&
 633                         isset( $this->mRevision ) &&
 634                         $this->mRevision->isCurrent();
 635         }
 636
 637         /**
 638          * Loads everything except the text
 639          * This isn't necessary for all uses, so it's only done if needed.
 640          * @private
 641          */
 642         function loadLastEdit() {
 643                 if ( -1 != $this->mUser )
 644                         return;
 645
 646                 # New or non-existent articles have no user information
 647                 $id = $this->getID();
 648                 if ( 0 == $id ) return;
 649
 650                 $this->mLastRevision = Revision::loadFromPageId( $this->getDB(), $id );
 651                 if( !is_null( $this->mLastRevision ) ) {
 652                         $this->mUser      = $this->mLastRevision->getUser();
 653                         $this->mUserText  = $this->mLastRevision->getUserText();
 654                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 655                         $this->mComment   = $this->mLastRevision->getComment();
 656                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 657                         $this->mRevIdFetched = $this->mLastRevision->getID();
 658                 }
 659         }
 660
 661         function getTimestamp() {
 662                 // Check if the field has been filled by ParserCache::get()
 663                 if ( !$this->mTimestamp ) {
 664                         $this->loadLastEdit();
 665                 }
 666                 return wfTimestamp(TS_MW, $this->mTimestamp);
 667         }
 668
 669         function getUser() {
 670                 $this->loadLastEdit();
 671                 return $this->mUser;
 672         }
 673
 674         function getUserText() {
 675                 $this->loadLastEdit();
 676                 return $this->mUserText;
 677         }
 678
 679         function getComment() {
 680                 $this->loadLastEdit();
 681                 return $this->mComment;
 682         }
 683
 684         function getMinorEdit() {
 685                 $this->loadLastEdit();
 686                 return $this->mMinorEdit;
 687         }
 688
 689         function getRevIdFetched() {
 690                 $this->loadLastEdit();
 691                 return $this->mRevIdFetched;
 692         }
 693
 694         /**
 695          * @todo Document, fixme $offset never used.
 696          * @param $limit Integer: default 0.
 697          * @param $offset Integer: default 0.
 698          */
 699         function getContributors($limit = 0, $offset = 0) {
 700                 $fname = 'Article::getContributors';
 701
 702                 # XXX: this is expensive; cache this info somewhere.
 703
 704                 $title = $this->mTitle;
 705                 $contribs = array();
 706                 $dbr =& wfGetDB( DB_SLAVE );
 707                 $revTable = $dbr->tableName( 'revision' );
 708                 $userTable = $dbr->tableName( 'user' );
 709                 $encDBkey = $dbr->addQuotes( $title->getDBkey() );
 710                 $ns = $title->getNamespace();
 711                 $user = $this->getUser();
 712                 $pageId = $this->getId();
 713
 714                 $sql = "SELECT rev_user, rev_user_text, user_real_name, MAX(rev_timestamp) as timestamp
 715                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 716                         WHERE rev_page = $pageId
 717                         AND rev_user != $user
 718                         GROUP BY rev_user, rev_user_text, user_real_name
 719                         ORDER BY timestamp DESC";
 720
 721                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 722                 $sql .= ' '. $this->getSelectOptions();
 723
 724                 $res = $dbr->query($sql, $fname);
 725
 726                 while ( $line = $dbr->fetchObject( $res ) ) {
 727                         $contribs[] = array($line->rev_user, $line->rev_user_text, $line->user_real_name);
 728                 }
 729
 730                 $dbr->freeResult($res);
 731                 return $contribs;
 732         }
 733
 734         /**
 735          * This is the default action of the script: just view the page of
 736          * the given title.
 737         */
 738         function view() {
 739                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 740                 global $wgEnableParserCache, $wgStylePath, $wgUseRCPatrol, $wgParser;
 741                 global $wgUseTrackbacks;
 742                 $sk = $wgUser->getSkin();
 743
 744                 $fname = 'Article::view';
 745                 wfProfileIn( $fname );
 746                 $parserCache =& ParserCache::singleton();
 747                 # Get variables from query string
 748                 $oldid = $this->getOldID();
 749
 750                 # getOldID may want us to redirect somewhere else
 751                 if ( $this->mRedirectUrl ) {
 752                         $wgOut->redirect( $this->mRedirectUrl );
 753                         wfProfileOut( $fname );
 754                         return;
 755                 }
 756
 757                 $diff = $wgRequest->getVal( 'diff' );
 758                 $rcid = $wgRequest->getVal( 'rcid' );
 759                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 760
 761                 $wgOut->setArticleFlag( true );
 762                 $wgOut->setRobotpolicy( 'index,follow' );
 763                 # If we got diff and oldid in the query, we want to see a
 764                 # diff page instead of the article.
 765
 766                 if ( !is_null( $diff ) ) {
 767                         require_once( 'DifferenceEngine.php' );
 768                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 769
 770                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid );
 771                         // DifferenceEngine directly fetched the revision:
 772                         $this->mRevIdFetched = $de->mNewid;
 773                         $de->showDiffPage();
 774
 775                         if( $diff == 0 ) {
 776                                 # Run view updates for current revision only
 777                                 $this->viewUpdates();
 778                         }
 779                         wfProfileOut( $fname );
 780                         return;
 781                 }
 782
 783                 if ( empty( $oldid ) && $this->checkTouched() ) {
 784                         $wgOut->setETag($parserCache->getETag($this, $wgUser));
 785
 786                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 787                                 wfProfileOut( $fname );
 788                                 return;
 789                         } else if ( $this->tryFileCache() ) {
 790                                 # tell wgOut that output is taken care of
 791                                 $wgOut->disable();
 792                                 $this->viewUpdates();
 793                                 wfProfileOut( $fname );
 794                                 return;
 795                         }
 796                 }
 797                 # Should the parser cache be used?
 798                 $pcache = $wgEnableParserCache &&
 799                         intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
 800                         $this->exists() &&
 801                         empty( $oldid );
 802                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 803                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 804                         wfIncrStats( 'pcache_miss_stub' );
 805                 }
 806
 807                 $wasRedirected = false;
 808                 if ( isset( $this->mRedirectedFrom ) ) {
 809                         // This is an internally redirected page view.
 810                         // We'll need a backlink to the source page for navigation.
 811                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 812                                 $sk = $wgUser->getSkin();
 813                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 814                                 $s = wfMsg( 'redirectedfrom', $redir );
 815                                 $wgOut->setSubtitle( $s );
 816                                 $wasRedirected = true;
 817                         }
 818                 } elseif ( !empty( $rdfrom ) ) {
 819                         // This is an externally redirected view, from some other wiki.
 820                         // If it was reported from a trusted site, supply a backlink.
 821                         global $wgRedirectSources;
 822                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 823                                 $sk = $wgUser->getSkin();
 824                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 825                                 $s = wfMsg( 'redirectedfrom', $redir );
 826                                 $wgOut->setSubtitle( $s );
 827                                 $wasRedirected = true;
 828                         }
 829                 }
 830
 831                 $outputDone = false;
 832                 if ( $pcache ) {
 833                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 834                                 $outputDone = true;
 835                         }
 836                 }
 837                 if ( !$outputDone ) {
 838                         $text = $this->getContent();
 839                         if ( $text === false ) {
 840                                 # Failed to load, replace text with error message
 841                                 $t = $this->mTitle->getPrefixedText();
 842                                 if( $oldid ) {
 843                                         $t .= ',oldid='.$oldid;
 844                                         $text = wfMsg( 'missingarticle', $t );
 845                                 } else {
 846                                         $text = wfMsg( 'noarticletext', $t );
 847                                 }
 848                         }
 849
 850                         # Another whitelist check in case oldid is altering the title
 851                         if ( !$this->mTitle->userCanRead() ) {
 852                                 $wgOut->loginToUse();
 853                                 $wgOut->output();
 854                                 exit;
 855                         }
 856
 857                         # We're looking at an old revision
 858
 859                         if ( !empty( $oldid ) ) {
 860                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 861                                 if( is_null( $this->mRevision ) ) {
 862                                         // FIXME: This would be a nice place to load the 'no such page' text.
 863                                 } else {
 864                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 865                                         if( $this->mRevision->isDeleted( MW_REV_DELETED_TEXT ) ) {
 866                                                 if( !$this->mRevision->userCan( MW_REV_DELETED_TEXT ) ) {
 867                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-permission' ) );
 868                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 869                                                         return;
 870                                                 } else {
 871                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-view' ) );
 872                                                         // and we are allowed to see...
 873                                                 }
 874                                         }
 875                                 }
 876
 877                         }
 878                 }
 879                 if( !$outputDone ) {
 880                         /**
 881                          * @fixme: this hook doesn't work most of the time, as it doesn't
 882                          * trigger when the parser cache is used.
 883                          */
 884                         wfRunHooks( 'ArticleViewHeader', array( &$this ) ) ;
 885                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 886                         # wrap user css and user js in pre and don't parse
 887                         # XXX: use $this->mTitle->usCssJsSubpage() when php is fixed/ a workaround is found
 888                         if (
 889                                 $this->mTitle->getNamespace() == NS_USER &&
 890                                 preg_match('/\\/[\\w]+\\.(css|js)$/', $this->mTitle->getDBkey())
 891                         ) {
 892                                 $wgOut->addWikiText( wfMsg('clearyourcache'));
 893                                 $wgOut->addHTML( '<pre>'.htmlspecialchars($this->mContent)."\n</pre>" );
 894                         } else if ( $rt = Title::newFromRedirect( $text ) ) {
 895                                 # Display redirect
 896                                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 897                                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 898                                 if( !$wasRedirected ) {
 899                                         $wgOut->setSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 900                                 }
 901                                 $targetUrl = $rt->escapeLocalURL();
 902                                 # fixme unused $titleText :
 903                                 $titleText = htmlspecialchars( $rt->getPrefixedText() );
 904                                 $link = $sk->makeLinkObj( $rt );
 905
 906                                 $wgOut->addHTML( '<img src="'.$imageUrl.'" alt="#REDIRECT" />' .
 907                                   '<span class="redirectText">'.$link.'</span>' );
 908
 909                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 910                                 $wgOut->addParserOutputNoText( $parseout );
 911                         } else if ( $pcache ) {
 912                                 # Display content and save to parser cache
 913                                 $wgOut->addPrimaryWikiText( $text, $this );
 914                         } else {
 915                                 # Display content, don't attempt to save to parser cache
 916
 917                                 # Don't show section-edit links on old revisions... this way lies madness.
 918                                 if( !$this->isCurrent() ) {
 919                                         $oldEditSectionSetting = $wgOut->mParserOptions->setEditSection( false );
 920                                 }
 921                                 # Display content and don't save to parser cache
 922                                 $wgOut->addPrimaryWikiText( $text, $this, false );
 923
 924                                 if( !$this->isCurrent() ) {
 925                                         $wgOut->mParserOptions->setEditSection( $oldEditSectionSetting );
 926                                 }
 927                         }
 928                 }
 929                 /* title may have been set from the cache */
 930                 $t = $wgOut->getPageTitle();
 931                 if( empty( $t ) ) {
 932                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 933                 }
 934
 935                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 936                 if( $this->mTitle->getNamespace() == NS_USER_TALK &&
 937                         User::isIP( $this->mTitle->getText() ) ) {
 938                         $wgOut->addWikiText( wfMsg('anontalkpagetext') );
 939                 }
 940
 941                 # If we have been passed an &rcid= parameter, we want to give the user a
 942                 # chance to mark this new article as patrolled.
 943                 if ( $wgUseRCPatrol && !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) ) {
 944                         $wgOut->addHTML(
 945                                 "<div class='patrollink'>" .
 946                                         wfMsg ( 'markaspatrolledlink',
 947                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsg('markaspatrolledtext'), "action=markpatrolled&rcid=$rcid" )
 948                                         ) .
 949                                 '</div>'
 950                          );
 951                 }
 952
 953                 # Trackbacks
 954                 if ($wgUseTrackbacks)
 955                         $this->addTrackbacks();
 956
 957                 $this->viewUpdates();
 958                 wfProfileOut( $fname );
 959         }
 960
 961         function addTrackbacks() {
 962                 global $wgOut, $wgUser;
 963
 964                 $dbr =& wfGetDB(DB_SLAVE);
 965                 $tbs = $dbr->select(
 966                                 /* FROM   */ 'trackbacks',
 967                                 /* SELECT */ array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
 968                                 /* WHERE  */ array('tb_page' => $this->getID())
 969                 );
 970
 971                 if (!$dbr->numrows($tbs))
 972                         return;
 973
 974                 $tbtext = "";
 975                 while ($o = $dbr->fetchObject($tbs)) {
 976                         $rmvtxt = "";
 977                         if ($wgUser->isAllowed( 'trackback' )) {
 978                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid="
 979                                                 . $o->tb_id . "&token=" . $wgUser->editToken());
 980                                 $rmvtxt = wfMsg('trackbackremove', $delurl);
 981                         }
 982                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
 983                                         $o->tb_title,
 984                                         $o->tb_url,
 985                                         $o->tb_ex,
 986                                         $o->tb_name,
 987                                         $rmvtxt);
 988                 }
 989                 $wgOut->addWikitext(wfMsg('trackbackbox', $tbtext));
 990         }
 991
 992         function deletetrackback() {
 993                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
 994
 995                 if (!$wgUser->matchEditToken($wgRequest->getVal('token'))) {
 996                         $wgOut->addWikitext(wfMsg('sessionfailure'));
 997                         return;
 998                 }
 999
1000                 if ((!$wgUser->isAllowed('delete'))) {
1001                         $wgOut->sysopRequired();
1002                         return;
1003                 }
1004
1005                 if (wfReadOnly()) {
1006                         $wgOut->readOnlyPage();
1007                         return;
1008                 }
1009
1010                 $db =& wfGetDB(DB_MASTER);
1011                 $db->delete('trackbacks', array('tb_id' => $wgRequest->getInt('tbid')));
1012                 $wgTitle->invalidateCache();
1013                 $wgOut->addWikiText(wfMsg('trackbackdeleteok'));
1014         }
1015
1016         function render() {
1017                 global $wgOut;
1018
1019                 $wgOut->setArticleBodyOnly(true);
1020                 $this->view();
1021         }
1022
1023         /**
1024          * Handle action=purge
1025          */
1026         function purge() {
1027                 global $wgUser, $wgRequest, $wgOut;
1028
1029                 if ( $wgUser->isLoggedIn() || $wgRequest->wasPosted() ) {
1030                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1031                                 $this->doPurge();
1032                         }
1033                 } else {
1034                         $msg = $wgOut->parse( wfMsg( 'confirm_purge' ) );
1035                         $action = $this->mTitle->escapeLocalURL( 'action=purge' );
1036                         $button = htmlspecialchars( wfMsg( 'confirm_purge_button' ) );
1037                         $msg = str_replace( '$1',
1038                                 "<form method=\"post\" action=\"$action\">\n" .
1039                                 "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1040                                 "</form>\n", $msg );
1041
1042                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1043                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1044                         $wgOut->addHTML( $msg );
1045                 }
1046         }
1047
1048         /**
1049          * Perform the actions of a page purging
1050          */
1051         function doPurge() {
1052                 global $wgUseSquid;
1053                 // Invalidate the cache
1054                 $this->mTitle->invalidateCache();
1055
1056                 if ( $wgUseSquid ) {
1057                         // Commit the transaction before the purge is sent
1058                         $dbw = wfGetDB( DB_MASTER );
1059                         $dbw->immediateCommit();
1060
1061                         // Send purge
1062                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1063                         $update->doUpdate();
1064                 }
1065                 $this->view();
1066         }
1067
1068         /**
1069          * Insert a new empty page record for this article.
1070          * This *must* be followed up by creating a revision
1071          * and running $this->updateToLatest( $rev_id );
1072          * or else the record will be left in a funky state.
1073          * Best if all done inside a transaction.
1074          *
1075          * @param Database $dbw
1076          * @param string   $restrictions
1077          * @return int     The newly created page_id key
1078          * @private
1079          */
1080         function insertOn( &$dbw, $restrictions = '' ) {
1081                 $fname = 'Article::insertOn';
1082                 wfProfileIn( $fname );
1083
1084                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1085                 $dbw->insert( 'page', array(
1086                         'page_id'           => $page_id,
1087                         'page_namespace'    => $this->mTitle->getNamespace(),
1088                         'page_title'        => $this->mTitle->getDBkey(),
1089                         'page_counter'      => 0,
1090                         'page_restrictions' => $restrictions,
1091                         'page_is_redirect'  => 0, # Will set this shortly...
1092                         'page_is_new'       => 1,
1093                         'page_random'       => wfRandom(),
1094                         'page_touched'      => $dbw->timestamp(),
1095                         'page_latest'       => 0, # Fill this in shortly...
1096                         'page_len'          => 0, # Fill this in shortly...
1097                 ), $fname );
1098                 $newid = $dbw->insertId();
1099
1100                 $this->mTitle->resetArticleId( $newid );
1101
1102                 wfProfileOut( $fname );
1103                 return $newid;
1104         }
1105
1106         /**
1107          * Update the page record to point to a newly saved revision.
1108          *
1109          * @param Database $dbw
1110          * @param Revision $revision For ID number, and text used to set
1111                                      length and redirect status fields
1112          * @param int $lastRevision If given, will not overwrite the page field
1113          *                          when different from the currently set value.
1114          *                          Giving 0 indicates the new page flag should
1115          *                          be set on.
1116          * @return bool true on success, false on failure
1117          * @private
1118          */
1119         function updateRevisionOn( &$dbw, $revision, $lastRevision = null ) {
1120                 $fname = 'Article::updateToRevision';
1121                 wfProfileIn( $fname );
1122
1123                 $conditions = array( 'page_id' => $this->getId() );
1124                 if( !is_null( $lastRevision ) ) {
1125                         # An extra check against threads stepping on each other
1126                         $conditions['page_latest'] = $lastRevision;
1127                 }
1128
1129                 $text = $revision->getText();
1130                 $dbw->update( 'page',
1131                         array( /* SET */
1132                                 'page_latest'      => $revision->getId(),
1133                                 'page_touched'     => $dbw->timestamp(),
1134                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1135                                 'page_is_redirect' => Article::isRedirect( $text ) ? 1 : 0,
1136                                 'page_len'         => strlen( $text ),
1137                         ),
1138                         $conditions,
1139                         $fname );
1140
1141                 wfProfileOut( $fname );
1142                 return ( $dbw->affectedRows() != 0 );
1143         }
1144
1145         /**
1146          * If the given revision is newer than the currently set page_latest,
1147          * update the page record. Otherwise, do nothing.
1148          *
1149          * @param Database $dbw
1150          * @param Revision $revision
1151          */
1152         function updateIfNewerOn( &$dbw, $revision ) {
1153                 $fname = 'Article::updateIfNewerOn';
1154                 wfProfileIn( $fname );
1155
1156                 $row = $dbw->selectRow(
1157                         array( 'revision', 'page' ),
1158                         array( 'rev_id', 'rev_timestamp' ),
1159                         array(
1160                                 'page_id' => $this->getId(),
1161                                 'page_latest=rev_id' ),
1162                         $fname );
1163                 if( $row ) {
1164                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1165                                 wfProfileOut( $fname );
1166                                 return false;
1167                         }
1168                         $prev = $row->rev_id;
1169                 } else {
1170                         # No or missing previous revision; mark the page as new
1171                         $prev = 0;
1172                 }
1173
1174                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev );
1175                 wfProfileOut( $fname );
1176                 return $ret;
1177         }
1178
1179         /**
1180          * Insert a new article into the database
1181          * @private
1182          */
1183         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false ) {
1184                 global $wgUser;
1185
1186                 $fname = 'Article::insertNewArticle';
1187                 wfProfileIn( $fname );
1188
1189                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1190                         &$summary, &$isminor, &$watchthis, NULL ) ) ) {
1191                         wfDebug( "$fname: ArticleSave hook aborted save!\n" );
1192                         wfProfileOut( $fname );
1193                         return false;
1194                 }
1195
1196                 $ns = $this->mTitle->getNamespace();
1197                 $ttl = $this->mTitle->getDBkey();
1198
1199                 # If this is a comment, add the summary as headline
1200                 if($comment && $summary!="") {
1201                         $text="== {$summary} ==\n\n".$text;
1202                 }
1203                 $text = $this->preSaveTransform( $text );
1204
1205
1206                 # Set statistics members
1207                 # We work out if it's countable after PST to avoid counter drift
1208                 # when articles are created with {{subst:}}
1209                 $this->mGoodAdjustment = (int)$this->isCountable( $text );
1210                 $this->mTotalAdjustment = 1;
1211
1212                 /* Silently ignore minoredit if not allowed */
1213                 $isminor = $isminor && $wgUser->isAllowed('minoredit');
1214                 $now = wfTimestampNow();
1215
1216                 $dbw =& wfGetDB( DB_MASTER );
1217
1218                 # Add the page record; stake our claim on this title!
1219                 $newid = $this->insertOn( $dbw );
1220
1221                 # Save the revision text...
1222                 $revision = new Revision( array(
1223                         'page'       => $newid,
1224                         'comment'    => $summary,
1225                         'minor_edit' => $isminor,
1226                         'text'       => $text
1227                         ) );
1228                 $revisionId = $revision->insertOn( $dbw );
1229
1230                 $this->mTitle->resetArticleID( $newid );
1231
1232                 # Update the page record with revision data
1233                 $this->updateRevisionOn( $dbw, $revision, 0 );
1234
1235                 Article::onArticleCreate( $this->mTitle );
1236                 if(!$suppressRC) {
1237                         require_once( 'RecentChange.php' );
1238                         $rcid = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary, 'default',
1239                           '', strlen( $text ), $revisionId );
1240                         # Mark as patrolled if the user can and has the option set
1241                         if( $wgUser->isAllowed( 'patrol' ) && $wgUser->getOption( 'autopatrol' ) ) {
1242                                 RecentChange::markPatrolled( $rcid );
1243                         }
1244                 }
1245
1246                 if ($watchthis) {
1247                         if(!$this->mTitle->userIsWatching()) $this->doWatch();
1248                 } else {
1249                         if ( $this->mTitle->userIsWatching() ) {
1250                                 $this->doUnwatch();
1251                         }
1252                 }
1253
1254                 # The talk page isn't in the regular link tables, so we need to update manually:
1255                 $talkns = $ns ^ 1; # talk -> normal; normal -> talk
1256                 $dbw->update( 'page',
1257                         array( 'page_touched' => $dbw->timestamp($now) ),
1258                         array( 'page_namespace' => $talkns,
1259                                'page_title' => $ttl ),
1260                         $fname );
1261
1262                 # standard deferred updates
1263                 $this->editUpdates( $text, $summary, $isminor, $now, $revisionId );
1264
1265                 $oldid = 0; # new article
1266                 $this->showArticle( $text, wfMsg( 'newarticle' ), false, $isminor, $now, $summary, $oldid );
1267
1268                 wfRunHooks( 'ArticleInsertComplete', array( &$this, &$wgUser, $text,
1269                         $summary, $isminor,
1270                         $watchthis, NULL ) );
1271                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$wgUser, $text,
1272                         $summary, $isminor,
1273                         $watchthis, NULL ) );
1274                 wfProfileOut( $fname );
1275         }
1276
1277         /**
1278          * @return string Complete article text, or null if error
1279          */
1280         function replaceSection($section, $text, $summary = '', $edittime = NULL) {
1281                 $fname = 'Article::replaceSection';
1282                 wfProfileIn( $fname );
1283
1284                 if ($section != '') {
1285                         if( is_null( $edittime ) ) {
1286                                 $rev = Revision::newFromTitle( $this->mTitle );
1287                         } else {
1288                                 $dbw =& wfGetDB( DB_MASTER );
1289                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1290                         }
1291                         if( is_null( $rev ) ) {
1292                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1293                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1294                                 return null;
1295                         }
1296                         $oldtext = $rev->getText();
1297
1298                         if($section=='new') {
1299                                 if($summary) $subject="== {$summary} ==\n\n";
1300                                 $text=$oldtext."\n\n".$subject.$text;
1301                         } else {
1302
1303                                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
1304                                 # comments to be stripped as well)
1305                                 $striparray=array();
1306                                 $parser=new Parser();
1307                                 $parser->mOutputType=OT_WIKI;
1308                                 $parser->mOptions = new ParserOptions();
1309                                 $oldtext=$parser->strip($oldtext, $striparray, true);
1310
1311                                 # now that we can be sure that no pseudo-sections are in the source,
1312                                 # split it up
1313                                 # Unfortunately we can't simply do a preg_replace because that might
1314                                 # replace the wrong section, so we have to use the section counter instead
1315                                 $secs=preg_split('/(^=+.+?=+|^<h[1-6].*?>.*?<\/h[1-6].*?>)(?!\S)/mi',
1316                                   $oldtext,-1,PREG_SPLIT_DELIM_CAPTURE);
1317                                 $secs[$section*2]=$text."\n\n"; // replace with edited
1318
1319                                 # section 0 is top (intro) section
1320                                 if($section!=0) {
1321
1322                                         # headline of old section - we need to go through this section
1323                                         # to determine if there are any subsections that now need to
1324                                         # be erased, as the mother section has been replaced with
1325                                         # the text of all subsections.
1326                                         $headline=$secs[$section*2-1];
1327                                         preg_match( '/^(=+).+?=+|^<h([1-6]).*?>.*?<\/h[1-6].*?>(?!\S)/mi',$headline,$matches);
1328                                         $hlevel=$matches[1];
1329
1330                                         # determine headline level for wikimarkup headings
1331                                         if(strpos($hlevel,'=')!==false) {
1332                                                 $hlevel=strlen($hlevel);
1333                                         }
1334
1335                                         $secs[$section*2-1]=''; // erase old headline
1336                                         $count=$section+1;
1337                                         $break=false;
1338                                         while(!empty($secs[$count*2-1]) && !$break) {
1339
1340                                                 $subheadline=$secs[$count*2-1];
1341                                                 preg_match(
1342                                                  '/^(=+).+?=+|^<h([1-6]).*?>.*?<\/h[1-6].*?>(?!\S)/mi',$subheadline,$matches);
1343                                                 $subhlevel=$matches[1];
1344                                                 if(strpos($subhlevel,'=')!==false) {
1345                                                         $subhlevel=strlen($subhlevel);
1346                                                 }
1347                                                 if($subhlevel > $hlevel) {
1348                                                         // erase old subsections
1349                                                         $secs[$count*2-1]='';
1350                                                         $secs[$count*2]='';
1351                                                 }
1352                                                 if($subhlevel <= $hlevel) {
1353                                                         $break=true;
1354                                                 }
1355                                                 $count++;
1356
1357                                         }
1358
1359                                 }
1360                                 $text=join('',$secs);
1361                                 # reinsert the stuff that we stripped out earlier
1362                                 $text=$parser->unstrip($text,$striparray);
1363                                 $text=$parser->unstripNoWiki($text,$striparray);
1364                         }
1365
1366                 }
1367                 wfProfileOut( $fname );
1368                 return $text;
1369         }
1370
1371         /**
1372          * Change an existing article. Puts the previous version back into the old table, updates RC
1373          * and all necessary caches, mostly via the deferred update array.
1374          *
1375          * It is possible to call this function from a command-line script, but note that you should
1376          * first set $wgUser, and clean up $wgDeferredUpdates after each edit.
1377          */
1378         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1379                 global $wgUser, $wgDBtransactions, $wgUseSquid;
1380                 global $wgPostCommitUpdateList, $wgUseFileCache;
1381
1382                 $fname = 'Article::updateArticle';
1383                 wfProfileIn( $fname );
1384                 $good = true;
1385
1386                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1387                         &$summary, &$minor,
1388                         &$watchthis, &$sectionanchor ) ) ) {
1389                         wfDebug( "$fname: ArticleSave hook aborted save!\n" );
1390                         wfProfileOut( $fname );
1391                         return false;
1392                 }
1393
1394                 $isminor = $minor && $wgUser->isAllowed('minoredit');
1395
1396                 $text = $this->preSaveTransform( $text );
1397                 $dbw =& wfGetDB( DB_MASTER );
1398                 $now = wfTimestampNow();
1399
1400                 # Update article, but only if changed.
1401
1402                 # It's important that we either rollback or complete, otherwise an attacker could
1403                 # overwrite cur entries by sending precisely timed user aborts. Random bored users
1404                 # could conceivably have the same effect, especially if cur is locked for long periods.
1405                 if( !$wgDBtransactions ) {
1406                         $userAbort = ignore_user_abort( true );
1407                 }
1408
1409                 $oldtext = $this->getContent();
1410                 $oldsize = strlen( $oldtext );
1411                 $newsize = strlen( $text );
1412                 $lastRevision = 0;
1413                 $revisionId = 0;
1414
1415                 if ( 0 != strcmp( $text, $oldtext ) ) {
1416                         $this->mGoodAdjustment = (int)$this->isCountable( $text )
1417                           - (int)$this->isCountable( $oldtext );
1418                         $this->mTotalAdjustment = 0;
1419                         $now = wfTimestampNow();
1420
1421                         $lastRevision = $dbw->selectField(
1422                                 'page', 'page_latest', array( 'page_id' => $this->getId() ) );
1423
1424                         $revision = new Revision( array(
1425                                 'page'       => $this->getId(),
1426                                 'comment'    => $summary,
1427                                 'minor_edit' => $isminor,
1428                                 'text'       => $text
1429                                 ) );
1430
1431                         $dbw->immediateCommit();
1432                         $dbw->begin();
1433                         $revisionId = $revision->insertOn( $dbw );
1434
1435                         # Update page
1436                         $ok = $this->updateRevisionOn( $dbw, $revision, $lastRevision );
1437
1438                         if( !$ok ) {
1439                                 /* Belated edit conflict! Run away!! */
1440                                 $good = false;
1441                                 $dbw->rollback();
1442                         } else {
1443                                 # Update recentchanges and purge cache and whatnot
1444                                 require_once( 'RecentChange.php' );
1445                                 $bot = (int)($wgUser->isBot() || $forceBot);
1446                                 $rcid = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $wgUser, $summary,
1447                                         $lastRevision, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1448                                         $revisionId );
1449
1450                                 # Mark as patrolled if the user can do so and has it set in their options
1451                                 if( $wgUser->isAllowed( 'patrol' ) && $wgUser->getOption( 'autopatrol' ) ) {
1452                                         RecentChange::markPatrolled( $rcid );
1453                                 }
1454
1455                                 $dbw->commit();
1456
1457                                 // Update caches outside the main transaction
1458                                 Article::onArticleEdit( $this->mTitle );
1459                         }
1460                 } else {
1461                         // Keep the same revision ID, but do some updates on it
1462                         $revisionId = $this->getRevIdFetched();
1463                 }
1464
1465                 if( !$wgDBtransactions ) {
1466                         ignore_user_abort( $userAbort );
1467                 }
1468
1469                 if ( $good ) {
1470                         if ($watchthis) {
1471                                 if (!$this->mTitle->userIsWatching()) {
1472                                         $dbw->immediateCommit();
1473                                         $dbw->begin();
1474                                         $this->doWatch();
1475                                         $dbw->commit();
1476                                 }
1477                         } else {
1478                                 if ( $this->mTitle->userIsWatching() ) {
1479                                         $dbw->immediateCommit();
1480                                         $dbw->begin();
1481                                         $this->doUnwatch();
1482                                         $dbw->commit();
1483                                 }
1484                         }
1485                         # standard deferred updates
1486                         $this->editUpdates( $text, $summary, $minor, $now, $revisionId );
1487
1488
1489                         $urls = array();
1490                         # Invalidate caches of all articles using this article as a template
1491
1492                         # Template namespace
1493                         # Purge all articles linking here
1494                         $titles = $this->mTitle->getTemplateLinksTo();
1495                         Title::touchArray( $titles );
1496                         if ( $wgUseSquid ) {
1497                                         foreach ( $titles as $title ) {
1498                                                 $urls[] = $title->getInternalURL();
1499                                         }
1500                         }
1501
1502                         # Squid updates
1503                         if ( $wgUseSquid ) {
1504                                 $urls = array_merge( $urls, $this->mTitle->getSquidURLs() );
1505                                 $u = new SquidUpdate( $urls );
1506                                 array_push( $wgPostCommitUpdateList, $u );
1507                         }
1508
1509                         # File cache
1510                         if ( $wgUseFileCache ) {
1511                                 $cm = new CacheManager($this->mTitle);
1512                                 @unlink($cm->fileCacheName());
1513                         }
1514
1515                         $this->showArticle( $text, wfMsg( 'updated' ), $sectionanchor, $isminor, $now, $summary, $lastRevision );
1516                 }
1517                 wfRunHooks( 'ArticleSaveComplete',
1518                         array( &$this, &$wgUser, $text,
1519                         $summary, $minor,
1520                         $watchthis, $sectionanchor ) );
1521                 wfProfileOut( $fname );
1522                 return $good;
1523         }
1524
1525         /**
1526          * After we've either updated or inserted the article, update
1527          * the link tables and redirect to the new page.
1528          * @todo FIXME some function arguments never used
1529          */
1530         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1531                 global $wgOut;
1532
1533                 $fname = 'Article::showArticle';
1534                 wfProfileIn( $fname );
1535
1536                 # Output the redirect
1537                 if( $this->isRedirect( $text ) )
1538                         $r = 'redirect=no';
1539                 else
1540                         $r = '';
1541                 $wgOut->redirect( $this->mTitle->getFullURL( $r ).$sectionanchor );
1542
1543                 wfProfileOut( $fname );
1544         }
1545
1546         /**
1547          * Mark this particular edit as patrolled
1548          */
1549         function markpatrolled() {
1550                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUser;
1551                 $wgOut->setRobotpolicy( 'noindex,follow' );
1552
1553                 # Check RC patrol config. option
1554                 if( !$wgUseRCPatrol ) {
1555                         $wgOut->errorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1556                         return;
1557                 }
1558
1559                 # Check permissions
1560                 if( !$wgUser->isAllowed( 'patrol' ) ) {
1561                         $wgOut->permissionRequired( 'patrol' );
1562                         return;
1563                 }
1564
1565                 $rcid = $wgRequest->getVal( 'rcid' );
1566                 if ( !is_null ( $rcid ) ) {
1567                         if( wfRunHooks( 'MarkPatrolled', array( &$rcid, &$wgUser, false ) ) ) {
1568                                 require_once( 'RecentChange.php' );
1569                                 RecentChange::markPatrolled( $rcid );
1570                                 wfRunHooks( 'MarkPatrolledComplete', array( &$rcid, &$wgUser, false ) );
1571                                 $wgOut->setPagetitle( wfMsg( 'markedaspatrolled' ) );
1572                                 $wgOut->addWikiText( wfMsg( 'markedaspatrolledtext' ) );
1573                         }
1574                         $rcTitle = Title::makeTitle( NS_SPECIAL, 'Recentchanges' );
1575                         $wgOut->returnToMain( false, $rcTitle->getPrefixedText() );
1576                 }
1577                 else {
1578                         $wgOut->errorpage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1579                 }
1580         }
1581
1582         /**
1583          * User-interface handler for the "watch" action
1584          */
1585
1586         function watch() {
1587
1588                 global $wgUser, $wgOut;
1589
1590                 if ( $wgUser->isAnon() ) {
1591                         $wgOut->errorpage( 'watchnologin', 'watchnologintext' );
1592                         return;
1593                 }
1594                 if ( wfReadOnly() ) {
1595                         $wgOut->readOnlyPage();
1596                         return;
1597                 }
1598
1599                 if( $this->doWatch() ) {
1600                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1601                         $wgOut->setRobotpolicy( 'noindex,follow' );
1602
1603                         $link = $this->mTitle->getPrefixedText();
1604                         $text = wfMsg( 'addedwatchtext', $link );
1605                         $wgOut->addWikiText( $text );
1606                 }
1607
1608                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1609         }
1610
1611         /**
1612          * Add this page to $wgUser's watchlist
1613          * @return bool true on successful watch operation
1614          */
1615         function doWatch() {
1616                 global $wgUser;
1617                 if( $wgUser->isAnon() ) {
1618                         return false;
1619                 }
1620
1621                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1622                         $wgUser->addWatch( $this->mTitle );
1623                         $wgUser->saveSettings();
1624
1625                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1626                 }
1627
1628                 return false;
1629         }
1630
1631         /**
1632          * User interface handler for the "unwatch" action.
1633          */
1634         function unwatch() {
1635
1636                 global $wgUser, $wgOut;
1637
1638                 if ( $wgUser->isAnon() ) {
1639                         $wgOut->errorpage( 'watchnologin', 'watchnologintext' );
1640                         return;
1641                 }
1642                 if ( wfReadOnly() ) {
1643                         $wgOut->readOnlyPage();
1644                         return;
1645                 }
1646
1647                 if( $this->doUnwatch() ) {
1648                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1649                         $wgOut->setRobotpolicy( 'noindex,follow' );
1650
1651                         $link = $this->mTitle->getPrefixedText();
1652                         $text = wfMsg( 'removedwatchtext', $link );
1653                         $wgOut->addWikiText( $text );
1654                 }
1655
1656                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1657         }
1658
1659         /**
1660          * Stop watching a page
1661          * @return bool true on successful unwatch
1662          */
1663         function doUnwatch() {
1664                 global $wgUser;
1665                 if( $wgUser->isAnon() ) {
1666                         return false;
1667                 }
1668
1669                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1670                         $wgUser->removeWatch( $this->mTitle );
1671                         $wgUser->saveSettings();
1672
1673                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1674                 }
1675
1676                 return false;
1677         }
1678
1679         /**
1680          * action=protect handler
1681          */
1682         function protect() {
1683                 require_once 'ProtectionForm.php';
1684                 $form = new ProtectionForm( $this );
1685                 $form->show();
1686         }
1687
1688         /**
1689          * action=unprotect handler (alias)
1690          */
1691         function unprotect() {
1692                 $this->protect();
1693         }
1694
1695         /**
1696          * Update the article's restriction field, and leave a log entry.
1697          *
1698          * @param array $limit set of restriction keys
1699          * @param string $reason
1700          * @return bool true on success
1701          */
1702         function updateRestrictions( $limit = array(), $reason = '' ) {
1703                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1704
1705                 $id = $this->mTitle->getArticleID();
1706                 if( !$wgUser->isAllowed( 'protect' ) || wfReadOnly() || $id == 0 ) {
1707                         return false;
1708                 }
1709
1710                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1711                 # we expect a single selection, but the schema allows otherwise.
1712                 $current = array();
1713                 foreach( $wgRestrictionTypes as $action )
1714                         $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1715
1716                 $current = Article::flattenRestrictions( $current );
1717                 $updated = Article::flattenRestrictions( $limit );
1718
1719                 $changed = ( $current != $updated );
1720                 $protect = ( $updated != '' );
1721
1722                 # If nothing's changed, do nothing
1723                 if( $changed ) {
1724                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1725
1726                                 $dbw =& wfGetDB( DB_MASTER );
1727
1728                                 # Prepare a null revision to be added to the history
1729                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $protect ? 'protectedarticle' : 'unprotectedarticle', $this->mTitle->getPrefixedText() ) );
1730                                 if( $reason )
1731                                         $comment .= ": $reason";
1732                                 if( $protect )
1733                                         $comment .= " [$updated]";
1734                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $comment, true );
1735                                 $nullRevId = $nullRevision->insertOn( $dbw );
1736
1737                                 # Update page record
1738                                 $dbw->update( 'page',
1739                                         array( /* SET */
1740                                                 'page_touched' => $dbw->timestamp(),
1741                                                 'page_restrictions' => $updated,
1742                                                 'page_latest' => $nullRevId
1743                                         ), array( /* WHERE */
1744                                                 'page_id' => $id
1745                                         ), 'Article::protect'
1746                                 );
1747                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1748
1749                                 # Update the protection log
1750                                 $log = new LogPage( 'protect' );
1751                                 if( $protect ) {
1752                                         $log->addEntry( 'protect', $this->mTitle, trim( $reason . " [$updated]" ) );
1753                                 } else {
1754                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1755                                 }
1756
1757                         } # End hook
1758                 } # End "changed" check
1759
1760                 return true;
1761         }
1762
1763         /**
1764          * Take an array of page restrictions and flatten it to a string
1765          * suitable for insertion into the page_restrictions field.
1766          * @param array $limit
1767          * @return string
1768          * @private
1769          */
1770         function flattenRestrictions( $limit ) {
1771                 if( !is_array( $limit ) ) {
1772                         wfDebugDieBacktrace( 'Article::flattenRestrictions given non-array restriction set' );
1773                 }
1774                 $bits = array();
1775                 ksort( $limit );
1776                 foreach( $limit as $action => $restrictions ) {
1777                         if( $restrictions != '' ) {
1778                                 $bits[] = "$action=$restrictions";
1779                         }
1780                 }
1781                 return implode( ':', $bits );
1782         }
1783
1784         /*
1785          * UI entry point for page deletion
1786          */
1787         function delete() {
1788                 global $wgUser, $wgOut, $wgRequest;
1789                 $fname = 'Article::delete';
1790                 $confirm = $wgRequest->wasPosted() &&
1791                         $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1792                 $reason = $wgRequest->getText( 'wpReason' );
1793
1794                 # This code desperately needs to be totally rewritten
1795
1796                 # Check permissions
1797                 if( $wgUser->isAllowed( 'delete' ) ) {
1798                         if( $wgUser->isBlocked() ) {
1799                                 $wgOut->blockedPage();
1800                                 return;
1801                         }
1802                 } else {
1803                         $wgOut->permissionRequired( 'delete' );
1804                         return;
1805                 }
1806
1807                 if( wfReadOnly() ) {
1808                         $wgOut->readOnlyPage();
1809                         return;
1810                 }
1811
1812                 $wgOut->setPagetitle( wfMsg( 'confirmdelete' ) );
1813
1814                 # Better double-check that it hasn't been deleted yet!
1815                 $dbw =& wfGetDB( DB_MASTER );
1816                 $conds = $this->mTitle->pageCond();
1817                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, $fname );
1818                 if ( $latest === false ) {
1819                         $wgOut->fatalError( wfMsg( 'cannotdelete' ) );
1820                         return;
1821                 }
1822
1823                 if( $confirm ) {
1824                         $this->doDelete( $reason );
1825                         return;
1826                 }
1827
1828                 # determine whether this page has earlier revisions
1829                 # and insert a warning if it does
1830                 $maxRevisions = 20;
1831                 $authors = $this->getLastNAuthors( $maxRevisions, $latest );
1832
1833                 if( count( $authors ) > 1 && !$confirm ) {
1834                         $skin=$wgUser->getSkin();
1835                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
1836                 }
1837
1838                 # If a single user is responsible for all revisions, find out who they are
1839                 if ( count( $authors ) == $maxRevisions ) {
1840                         // Query bailed out, too many revisions to find out if they're all the same
1841                         $authorOfAll = false;
1842                 } else {
1843                         $authorOfAll = reset( $authors );
1844                         foreach ( $authors as $author ) {
1845                                 if ( $authorOfAll != $author ) {
1846                                         $authorOfAll = false;
1847                                         break;
1848                                 }
1849                         }
1850                 }
1851                 # Fetch article text
1852                 $rev = Revision::newFromTitle( $this->mTitle );
1853
1854                 if( !is_null( $rev ) ) {
1855                         # if this is a mini-text, we can paste part of it into the deletion reason
1856                         $text = $rev->getText();
1857
1858                         #if this is empty, an earlier revision may contain "useful" text
1859                         $blanked = false;
1860                         if( $text == '' ) {
1861                                 $prev = $rev->getPrevious();
1862                                 if( $prev ) {
1863                                         $text = $prev->getText();
1864                                         $blanked = true;
1865                                 }
1866                         }
1867
1868                         $length = strlen( $text );
1869
1870                         # this should not happen, since it is not possible to store an empty, new
1871                         # page. Let's insert a standard text in case it does, though
1872                         if( $length == 0 && $reason === '' ) {
1873                                 $reason = wfMsgForContent( 'exblank' );
1874                         }
1875
1876                         if( $length < 500 && $reason === '' ) {
1877                                 # comment field=255, let's grep the first 150 to have some user
1878                                 # space left
1879                                 global $wgContLang;
1880                                 $text = $wgContLang->truncate( $text, 150, '...' );
1881
1882                                 # let's strip out newlines
1883                                 $text = preg_replace( "/[\n\r]/", '', $text );
1884
1885                                 if( !$blanked ) {
1886                                         if( $authorOfAll === false ) {
1887                                                 $reason = wfMsgForContent( 'excontent', $text );
1888                                         } else {
1889                                                 $reason = wfMsgForContent( 'excontentauthor', $text, $authorOfAll );
1890                                         }
1891                                 } else {
1892                                         $reason = wfMsgForContent( 'exbeforeblank', $text );
1893                                 }
1894                         }
1895                 }
1896
1897                 return $this->confirmDelete( '', $reason );
1898         }
1899
1900         /**
1901          * Get the last N authors
1902          * @param int $num Number of revisions to get
1903          * @param string $revLatest The latest rev_id, selected from the master (optional)
1904          * @return array Array of authors, duplicates not removed
1905          */
1906         function getLastNAuthors( $num, $revLatest = 0 ) {
1907                 $fname = 'Article::getLastNAuthors';
1908                 wfProfileIn( $fname );
1909
1910                 // First try the slave
1911                 // If that doesn't have the latest revision, try the master
1912                 $continue = 2;
1913                 $db =& wfGetDB( DB_SLAVE );
1914                 do {
1915                         $res = $db->select( array( 'page', 'revision' ),
1916                                 array( 'rev_id', 'rev_user_text' ),
1917                                 array(
1918                                         'page_namespace' => $this->mTitle->getNamespace(),
1919                                         'page_title' => $this->mTitle->getDBkey(),
1920                                         'rev_page = page_id'
1921                                 ), $fname, $this->getSelectOptions( array(
1922                                         'ORDER BY' => 'rev_timestamp DESC',
1923                                         'LIMIT' => $num
1924                                 ) )
1925                         );
1926                         if ( !$res ) {
1927                                 wfProfileOut( $fname );
1928                                 return array();
1929                         }
1930                         $row = $db->fetchObject( $res );
1931                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1932                                 $db =& wfGetDB( DB_MASTER );
1933                                 $continue--;
1934                         } else {
1935                                 $continue = 0;
1936                         }
1937                 } while ( $continue );
1938
1939                 $authors = array( $row->rev_user_text );
1940                 while ( $row = $db->fetchObject( $res ) ) {
1941                         $authors[] = $row->rev_user_text;
1942                 }
1943                 wfProfileOut( $fname );
1944                 return $authors;
1945         }
1946
1947         /**
1948          * Output deletion confirmation dialog
1949          */
1950         function confirmDelete( $par, $reason ) {
1951                 global $wgOut, $wgUser;
1952
1953                 wfDebug( "Article::confirmDelete\n" );
1954
1955                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
1956                 $wgOut->setSubtitle( wfMsg( 'deletesub', $sub ) );
1957                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1958                 $wgOut->addWikiText( wfMsg( 'confirmdeletetext' ) );
1959
1960                 $formaction = $this->mTitle->escapeLocalURL( 'action=delete' . $par );
1961
1962                 $confirm = htmlspecialchars( wfMsg( 'deletepage' ) );
1963                 $delcom = htmlspecialchars( wfMsg( 'deletecomment' ) );
1964                 $token = htmlspecialchars( $wgUser->editToken() );
1965
1966                 $wgOut->addHTML( "
1967 <form id='deleteconfirm' method='post' action=\"{$formaction}\">
1968         <table border='0'>
1969                 <tr>
1970                         <td align='right'>
1971                                 <label for='wpReason'>{$delcom}:</label>
1972                         </td>
1973                         <td align='left'>
1974                                 <input type='text' size='60' name='wpReason' id='wpReason' value=\"" . htmlspecialchars( $reason ) . "\" />
1975                         </td>
1976                 </tr>
1977                 <tr>
1978                         <td>&nbsp;</td>
1979                         <td>
1980                                 <input type='submit' name='wpConfirmB' value=\"{$confirm}\" />
1981                         </td>
1982                 </tr>
1983         </table>
1984         <input type='hidden' name='wpEditToken' value=\"{$token}\" />
1985 </form>\n" );
1986
1987                 $wgOut->returnToMain( false );
1988         }
1989
1990
1991         /**
1992          * Perform a deletion and output success or failure messages
1993          */
1994         function doDelete( $reason ) {
1995                 global $wgOut, $wgUser;
1996                 $fname = 'Article::doDelete';
1997                 wfDebug( $fname."\n" );
1998
1999                 if (wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason))) {
2000                         if ( $this->doDeleteArticle( $reason ) ) {
2001                                 $deleted = $this->mTitle->getPrefixedText();
2002
2003                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2004                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2005
2006                                 $loglink = '[[Special:Log/delete|' . wfMsg( 'deletionlog' ) . ']]';
2007                                 $text = wfMsg( 'deletedtext', $deleted, $loglink );
2008
2009                                 $wgOut->addWikiText( $text );
2010                                 $wgOut->returnToMain( false );
2011                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason));
2012                         } else {
2013                                 $wgOut->fatalError( wfMsg( 'cannotdelete' ) );
2014                         }
2015                 }
2016         }
2017
2018         /**
2019          * Back-end article deletion
2020          * Deletes the article with database consistency, writes logs, purges caches
2021          * Returns success
2022          */
2023         function doDeleteArticle( $reason ) {
2024                 global $wgUseSquid, $wgDeferredUpdateList;
2025                 global $wgPostCommitUpdateList, $wgUseTrackbacks;
2026
2027                 $fname = 'Article::doDeleteArticle';
2028                 wfDebug( $fname."\n" );
2029
2030                 $dbw =& wfGetDB( DB_MASTER );
2031                 $ns = $this->mTitle->getNamespace();
2032                 $t = $this->mTitle->getDBkey();
2033                 $id = $this->mTitle->getArticleID();
2034
2035                 if ( $t == '' || $id == 0 ) {
2036                         return false;
2037                 }
2038
2039                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
2040                 array_push( $wgDeferredUpdateList, $u );
2041
2042                 $linksTo = $this->mTitle->getLinksTo();
2043
2044                 # Squid purging
2045                 if ( $wgUseSquid ) {
2046                         $urls = array(
2047                                 $this->mTitle->getInternalURL(),
2048                                 $this->mTitle->getInternalURL( 'history' )
2049                         );
2050
2051                         $u = SquidUpdate::newFromTitles( $linksTo, $urls );
2052                         array_push( $wgPostCommitUpdateList, $u );
2053
2054                 }
2055
2056                 # Client and file cache invalidation
2057                 Title::touchArray( $linksTo );
2058
2059
2060                 // For now, shunt the revision data into the archive table.
2061                 // Text is *not* removed from the text table; bulk storage
2062                 // is left intact to avoid breaking block-compression or
2063                 // immutable storage schemes.
2064                 //
2065                 // For backwards compatibility, note that some older archive
2066                 // table entries will have ar_text and ar_flags fields still.
2067                 //
2068                 // In the future, we may keep revisions and mark them with
2069                 // the rev_deleted field, which is reserved for this purpose.
2070                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2071                         array(
2072                                 'ar_namespace'  => 'page_namespace',
2073                                 'ar_title'      => 'page_title',
2074                                 'ar_comment'    => 'rev_comment',
2075                                 'ar_user'       => 'rev_user',
2076                                 'ar_user_text'  => 'rev_user_text',
2077                                 'ar_timestamp'  => 'rev_timestamp',
2078                                 'ar_minor_edit' => 'rev_minor_edit',
2079                                 'ar_rev_id'     => 'rev_id',
2080                                 'ar_text_id'    => 'rev_text_id',
2081                         ), array(
2082                                 'page_id' => $id,
2083                                 'page_id = rev_page'
2084                         ), $fname
2085                 );
2086
2087                 # Now that it's safely backed up, delete it
2088                 $dbw->delete( 'revision', array( 'rev_page' => $id ), $fname );
2089                 $dbw->delete( 'page', array( 'page_id' => $id ), $fname);
2090
2091                 if ($wgUseTrackbacks)
2092                         $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), $fname );
2093
2094                 # Clean up recentchanges entries...
2095                 $dbw->delete( 'recentchanges', array( 'rc_namespace' => $ns, 'rc_title' => $t ), $fname );
2096
2097                 # Finally, clean up the link tables
2098                 $t = $this->mTitle->getPrefixedDBkey();
2099
2100                 Article::onArticleDelete( $this->mTitle );
2101
2102                 # Delete outgoing links
2103                 $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2104                 $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2105                 $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2106                 $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2107                 $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2108                 $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2109
2110                 # Log the deletion
2111                 $log = new LogPage( 'delete' );
2112                 $log->addEntry( 'delete', $this->mTitle, $reason );
2113
2114                 # Clear the cached article id so the interface doesn't act like we exist
2115                 $this->mTitle->resetArticleID( 0 );
2116                 $this->mTitle->mArticleID = 0;
2117                 return true;
2118         }
2119
2120         /**
2121          * Revert a modification
2122          */
2123         function rollback() {
2124                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2125                 $fname = 'Article::rollback';
2126
2127                 if( $wgUser->isAllowed( 'rollback' ) ) {
2128                         if( $wgUser->isBlocked() ) {
2129                                 $wgOut->blockedPage();
2130                                 return;
2131                         }
2132                 } else {
2133                         $wgOut->permissionRequired( 'rollback' );
2134                         return;
2135                 }
2136
2137                 if ( wfReadOnly() ) {
2138                         $wgOut->readOnlyPage( $this->getContent() );
2139                         return;
2140                 }
2141                 if( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ),
2142                         array( $this->mTitle->getPrefixedText(),
2143                                 $wgRequest->getVal( 'from' ) )  ) ) {
2144                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2145                         $wgOut->addWikiText( wfMsg( 'sessionfailure' ) );
2146                         return;
2147                 }
2148                 $dbw =& wfGetDB( DB_MASTER );
2149
2150                 # Enhanced rollback, marks edits rc_bot=1
2151                 $bot = $wgRequest->getBool( 'bot' );
2152
2153                 # Replace all this user's current edits with the next one down
2154                 $tt = $this->mTitle->getDBKey();
2155                 $n = $this->mTitle->getNamespace();
2156
2157                 # Get the last editor, lock table exclusively
2158                 $dbw->begin();
2159                 $current = Revision::newFromTitle( $this->mTitle );
2160                 if( is_null( $current ) ) {
2161                         # Something wrong... no page?
2162                         $dbw->rollback();
2163                         $wgOut->addHTML( wfMsg( 'notanarticle' ) );
2164                         return;
2165                 }
2166
2167                 $from = str_replace( '_', ' ', $wgRequest->getVal( 'from' ) );
2168                 if( $from != $current->getUserText() ) {
2169                         $wgOut->setPageTitle( wfMsg('rollbackfailed') );
2170                         $wgOut->addWikiText( wfMsg( 'alreadyrolled',
2171                                 htmlspecialchars( $this->mTitle->getPrefixedText()),
2172                                 htmlspecialchars( $from ),
2173                                 htmlspecialchars( $current->getUserText() ) ) );
2174                         if( $current->getComment() != '') {
2175                                 $wgOut->addHTML(
2176                                         wfMsg( 'editcomment',
2177                                         htmlspecialchars( $current->getComment() ) ) );
2178                         }
2179                         return;
2180                 }
2181
2182                 # Get the last edit not by this guy
2183                 $user = intval( $current->getUser() );
2184                 $user_text = $dbw->addQuotes( $current->getUserText() );
2185                 $s = $dbw->selectRow( 'revision',
2186                         array( 'rev_id', 'rev_timestamp' ),
2187                         array(
2188                                 'rev_page' => $current->getPage(),
2189                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
2190                         ), $fname,
2191                         array(
2192                                 'USE INDEX' => 'page_timestamp',
2193                                 'ORDER BY'  => 'rev_timestamp DESC' )
2194                         );
2195                 if( $s === false ) {
2196                         # Something wrong
2197                         $dbw->rollback();
2198                         $wgOut->setPageTitle(wfMsg('rollbackfailed'));
2199                         $wgOut->addHTML( wfMsg( 'cantrollback' ) );
2200                         return;
2201                 }
2202
2203                 $set = array();
2204                 if ( $bot ) {
2205                         # Mark all reverted edits as bot
2206                         $set['rc_bot'] = 1;
2207                 }
2208                 if ( $wgUseRCPatrol ) {
2209                         # Mark all reverted edits as patrolled
2210                         $set['rc_patrolled'] = 1;
2211                 }
2212
2213                 if ( $set ) {
2214                         $dbw->update( 'recentchanges', $set,
2215                                 array( /* WHERE */
2216                                         'rc_cur_id'    => $current->getPage(),
2217                                         'rc_user_text' => $current->getUserText(),
2218                                         "rc_timestamp > '{$s->rev_timestamp}'",
2219                                 ), $fname
2220                         );
2221                 }
2222
2223                 # Get the edit summary
2224                 $target = Revision::newFromId( $s->rev_id );
2225                 $newComment = wfMsgForContent( 'revertpage', $target->getUserText(), $from );
2226                 $newComment = $wgRequest->getText( 'summary', $newComment );
2227
2228                 # Save it!
2229                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2230                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2231                 $wgOut->addHTML( '<h2>' . htmlspecialchars( $newComment ) . "</h2>\n<hr />\n" );
2232
2233                 $this->updateArticle( $target->getText(), $newComment, 1, $this->mTitle->userIsWatching(), $bot );
2234                 Article::onArticleEdit( $this->mTitle );
2235
2236                 $dbw->commit();
2237                 $wgOut->returnToMain( false );
2238         }
2239
2240
2241         /**
2242          * Do standard deferred updates after page view
2243          * @private
2244          */
2245         function viewUpdates() {
2246                 global $wgDeferredUpdateList;
2247
2248                 if ( 0 != $this->getID() ) {
2249                         global $wgDisableCounters;
2250                         if( !$wgDisableCounters ) {
2251                                 Article::incViewCount( $this->getID() );
2252                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2253                                 array_push( $wgDeferredUpdateList, $u );
2254                         }
2255                 }
2256
2257                 # Update newtalk / watchlist notification status
2258                 global $wgUser;
2259                 $wgUser->clearNotification( $this->mTitle );
2260         }
2261
2262         /**
2263          * Do standard deferred updates after page edit.
2264          * Every 1000th edit, prune the recent changes table.
2265          * @private
2266          * @param string $text
2267          */
2268         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid) {
2269                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser;
2270
2271                 $fname = 'Article::editUpdates';
2272                 wfProfileIn( $fname );
2273
2274                 # Parse the text
2275                 $options = new ParserOptions;
2276                 $options->setTidy(true);
2277                 $poutput = $wgParser->parse( $text, $this->mTitle, $options, true, true, $newid );
2278
2279                 # Save it to the parser cache
2280                 $parserCache =& ParserCache::singleton();
2281                 $parserCache->save( $poutput, $this, $wgUser );
2282
2283                 # Update the links tables
2284                 $u = new LinksUpdate( $this->mTitle, $poutput );
2285                 $u->doUpdate();
2286
2287                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2288                         wfSeedRandom();
2289                         if ( 0 == mt_rand( 0, 999 ) ) {
2290                                 # Periodically flush old entries from the recentchanges table.
2291                                 global $wgRCMaxAge;
2292
2293                                 $dbw =& wfGetDB( DB_MASTER );
2294                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2295                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2296                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2297                                 $dbw->query( $sql );
2298                         }
2299                 }
2300
2301                 $id = $this->getID();
2302                 $title = $this->mTitle->getPrefixedDBkey();
2303                 $shortTitle = $this->mTitle->getDBkey();
2304
2305                 if ( 0 == $id ) {
2306                         wfProfileOut( $fname );
2307                         return;
2308                 }
2309
2310                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2311                 array_push( $wgDeferredUpdateList, $u );
2312                 $u = new SearchUpdate( $id, $title, $text );
2313                 array_push( $wgDeferredUpdateList, $u );
2314
2315                 # If this is another user's talk page, update newtalk
2316
2317                 if ($this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getName()) {
2318                         if (wfRunHooks('ArticleEditUpdateNewTalk', array(&$this)) ) {
2319                                 $other = User::newFromName( $shortTitle );
2320                                 if( is_null( $other ) && User::isIP( $shortTitle ) ) {
2321                                         // An anonymous user
2322                                         $other = new User();
2323                                         $other->setName( $shortTitle );
2324                                 }
2325                                 if( $other ) {
2326                                         $other->setNewtalk( true );
2327                                 }
2328                         }
2329                 }
2330
2331                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2332                         $wgMessageCache->replace( $shortTitle, $text );
2333                 }
2334
2335                 wfProfileOut( $fname );
2336         }
2337
2338         /**
2339          * Generate the navigation links when browsing through an article revisions
2340          * It shows the information as:
2341          *   Revision as of \<date\>; view current revision
2342          *   \<- Previous version | Next Version -\>
2343          *
2344          * @private
2345          * @param string $oldid         Revision ID of this article revision
2346          */
2347         function setOldSubtitle( $oldid=0 ) {
2348                 global $wgLang, $wgOut, $wgUser;
2349
2350                 $current = ( $oldid == $this->mLatest );
2351                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2352                 $sk = $wgUser->getSkin();
2353                 $lnk = $current
2354                         ? wfMsg( 'currentrevisionlink' )
2355                         : $lnk = $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2356                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2357                 $prevlink = $prev
2358                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2359                         : wfMsg( 'previousrevision' );
2360                 $nextlink = $current
2361                         ? wfMsg( 'nextrevision' )
2362                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2363                 $r = wfMsg( 'revisionasofwithlink', $td, $lnk, $prevlink, $nextlink );
2364                 $wgOut->setSubtitle( $r );
2365         }
2366
2367         /**
2368          * This function is called right before saving the wikitext,
2369          * so we can do things like signatures and links-in-context.
2370          *
2371          * @param string $text
2372          */
2373         function preSaveTransform( $text ) {
2374                 global $wgParser, $wgUser;
2375                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2376         }
2377
2378         /* Caching functions */
2379
2380         /**
2381          * checkLastModified returns true if it has taken care of all
2382          * output to the client that is necessary for this request.
2383          * (that is, it has sent a cached version of the page)
2384          */
2385         function tryFileCache() {
2386                 static $called = false;
2387                 if( $called ) {
2388                         wfDebug( " tryFileCache() -- called twice!?\n" );
2389                         return;
2390                 }
2391                 $called = true;
2392                 if($this->isFileCacheable()) {
2393                         $touched = $this->mTouched;
2394                         $cache = new CacheManager( $this->mTitle );
2395                         if($cache->isFileCacheGood( $touched )) {
2396                                 wfDebug( " tryFileCache() - about to load\n" );
2397                                 $cache->loadFromFileCache();
2398                                 return true;
2399                         } else {
2400                                 wfDebug( " tryFileCache() - starting buffer\n" );
2401                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2402                         }
2403                 } else {
2404                         wfDebug( " tryFileCache() - not cacheable\n" );
2405                 }
2406         }
2407
2408         /**
2409          * Check if the page can be cached
2410          * @return bool
2411          */
2412         function isFileCacheable() {
2413                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest;
2414                 extract( $wgRequest->getValues( 'action', 'oldid', 'diff', 'redirect', 'printable' ) );
2415
2416                 return $wgUseFileCache
2417                         and (!$wgShowIPinHeader)
2418                         and ($this->getID() != 0)
2419                         and ($wgUser->isAnon())
2420                         and (!$wgUser->getNewtalk())
2421                         and ($this->mTitle->getNamespace() != NS_SPECIAL )
2422                         and (empty( $action ) || $action == 'view')
2423                         and (!isset($oldid))
2424                         and (!isset($diff))
2425                         and (!isset($redirect))
2426                         and (!isset($printable))
2427                         and (!$this->mRedirectedFrom);
2428         }
2429
2430         /**
2431          * Loads page_touched and returns a value indicating if it should be used
2432          *
2433          */
2434         function checkTouched() {
2435                 $fname = 'Article::checkTouched';
2436                 if( !$this->mDataLoaded ) {
2437                         $this->loadPageData();
2438                 }
2439                 return !$this->mIsRedirect;
2440         }
2441
2442         /**
2443          * Get the page_touched field
2444          */
2445         function getTouched() {
2446                 # Ensure that page data has been loaded
2447                 if( !$this->mDataLoaded ) {
2448                         $this->loadPageData();
2449                 }
2450                 return $this->mTouched;
2451         }
2452
2453         /**
2454          * Get the page_latest field
2455          */
2456         function getLatest() {
2457                 if ( !$this->mDataLoaded ) {
2458                         $this->loadPageData();
2459                 }
2460                 return $this->mLatest;
2461         }
2462
2463         /**
2464          * Edit an article without doing all that other stuff
2465          * The article must already exist; link tables etc
2466          * are not updated, caches are not flushed.
2467          *
2468          * @param string $text text submitted
2469          * @param string $comment comment submitted
2470          * @param bool $minor whereas it's a minor modification
2471          */
2472         function quickEdit( $text, $comment = '', $minor = 0 ) {
2473                 $fname = 'Article::quickEdit';
2474                 wfProfileIn( $fname );
2475
2476                 $dbw =& wfGetDB( DB_MASTER );
2477                 $dbw->begin();
2478                 $revision = new Revision( array(
2479                         'page'       => $this->getId(),
2480                         'text'       => $text,
2481                         'comment'    => $comment,
2482                         'minor_edit' => $minor ? 1 : 0,
2483                         ) );
2484                 # fixme : $revisionId never used
2485                 $revisionId = $revision->insertOn( $dbw );
2486                 $this->updateRevisionOn( $dbw, $revision );
2487                 $dbw->commit();
2488
2489                 wfProfileOut( $fname );
2490         }
2491
2492         /**
2493          * Used to increment the view counter
2494          *
2495          * @static
2496          * @param integer $id article id
2497          */
2498         function incViewCount( $id ) {
2499                 $id = intval( $id );
2500                 global $wgHitcounterUpdateFreq, $wgDBtype;
2501
2502                 $dbw =& wfGetDB( DB_MASTER );
2503                 $pageTable = $dbw->tableName( 'page' );
2504                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
2505                 $acchitsTable = $dbw->tableName( 'acchits' );
2506
2507                 if( $wgHitcounterUpdateFreq <= 1 ){ //
2508                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
2509                         return;
2510                 }
2511
2512                 # Not important enough to warrant an error page in case of failure
2513                 $oldignore = $dbw->ignoreErrors( true );
2514
2515                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
2516
2517                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
2518                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
2519                         # Most of the time (or on SQL errors), skip row count check
2520                         $dbw->ignoreErrors( $oldignore );
2521                         return;
2522                 }
2523
2524                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
2525                 $row = $dbw->fetchObject( $res );
2526                 $rown = intval( $row->n );
2527                 if( $rown >= $wgHitcounterUpdateFreq ){
2528                         wfProfileIn( 'Article::incViewCount-collect' );
2529                         $old_user_abort = ignore_user_abort( true );
2530
2531                         if ($wgDBtype == 'mysql')
2532                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
2533                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
2534                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype".
2535                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
2536                                 'GROUP BY hc_id');
2537                         $dbw->query("DELETE FROM $hitcounterTable");
2538                         if ($wgDBtype == 'mysql')
2539                                 $dbw->query('UNLOCK TABLES');
2540                         $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
2541                                 'WHERE page_id = hc_id');
2542                         $dbw->query("DROP TABLE $acchitsTable");
2543
2544                         ignore_user_abort( $old_user_abort );
2545                         wfProfileOut( 'Article::incViewCount-collect' );
2546                 }
2547                 $dbw->ignoreErrors( $oldignore );
2548         }
2549
2550         /**#@+
2551          * The onArticle*() functions are supposed to be a kind of hooks
2552          * which should be called whenever any of the specified actions
2553          * are done.
2554          *
2555          * This is a good place to put code to clear caches, for instance.
2556          *
2557          * This is called on page move and undelete, as well as edit
2558          * @static
2559          * @param $title_obj a title object
2560          */
2561
2562         function onArticleCreate($title_obj) {
2563                 global $wgUseSquid, $wgPostCommitUpdateList;
2564
2565                 $title_obj->touchLinks();
2566                 $titles = $title_obj->getLinksTo();
2567
2568                 # Purge squid
2569                 if ( $wgUseSquid ) {
2570                         $urls = $title_obj->getSquidURLs();
2571                         foreach ( $titles as $linkTitle ) {
2572                                 $urls[] = $linkTitle->getInternalURL();
2573                         }
2574                         $u = new SquidUpdate( $urls );
2575                         array_push( $wgPostCommitUpdateList, $u );
2576                 }
2577         }
2578
2579         function onArticleDelete( $title ) {
2580                 global $wgMessageCache;
2581
2582                 $title->touchLinks();
2583
2584                 if( $title->getNamespace() == NS_MEDIAWIKI) {
2585                         $wgMessageCache->replace( $title->getDBkey(), false );
2586                 }
2587         }
2588
2589         /**
2590          * Purge caches on page update etc
2591          */
2592         function onArticleEdit( $title ) {
2593                 global $wgUseSquid, $wgPostCommitUpdateList, $wgUseFileCache;
2594
2595                 $urls = array();
2596
2597                 // Template namespace? Purge all articles linking here.
2598                 // FIXME: When a templatelinks table arrives, use it for all includes.
2599                 if ( $title->getNamespace() == NS_TEMPLATE) {
2600                         $titles = $title->getLinksTo();
2601                         Title::touchArray( $titles );
2602                         if ( $wgUseSquid ) {
2603                                 foreach ( $titles as $link ) {
2604                                         $urls[] = $link->getInternalURL();
2605                                 }
2606                         }
2607                 }
2608
2609                 # Squid updates
2610                 if ( $wgUseSquid ) {
2611                         $urls = array_merge( $urls, $title->getSquidURLs() );
2612                         $u = new SquidUpdate( $urls );
2613                         array_push( $wgPostCommitUpdateList, $u );
2614                 }
2615
2616                 # File cache
2617                 if ( $wgUseFileCache ) {
2618                         $cm = new CacheManager( $title );
2619                         @unlink( $cm->fileCacheName() );
2620                 }
2621         }
2622
2623         /**#@-*/
2624
2625         /**
2626          * Info about this page
2627          * Called for ?action=info when $wgAllowPageInfo is on.
2628          *
2629          * @public
2630          */
2631         function info() {
2632                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
2633                 $fname = 'Article::info';
2634
2635                 if ( !$wgAllowPageInfo ) {
2636                         $wgOut->errorpage( 'nosuchaction', 'nosuchactiontext' );
2637                         return;
2638                 }
2639
2640                 $page = $this->mTitle->getSubjectPage();
2641
2642                 $wgOut->setPagetitle( $page->getPrefixedText() );
2643                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ));
2644
2645                 # first, see if the page exists at all.
2646                 $exists = $page->getArticleId() != 0;
2647                 if( !$exists ) {
2648                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2649                                 $wgOut->addHTML(wfMsgWeirdKey ( $this->mTitle->getText() ) );
2650                         } else {
2651                                 $wgOut->addHTML(wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' ) );
2652                         }
2653                 } else {
2654                         $dbr =& wfGetDB( DB_SLAVE );
2655                         $wl_clause = array(
2656                                 'wl_title'     => $page->getDBkey(),
2657                                 'wl_namespace' => $page->getNamespace() );
2658                         $numwatchers = $dbr->selectField(
2659                                 'watchlist',
2660                                 'COUNT(*)',
2661                                 $wl_clause,
2662                                 $fname,
2663                                 $this->getSelectOptions() );
2664
2665                         $pageInfo = $this->pageCountInfo( $page );
2666                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
2667
2668                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
2669                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
2670                         if( $talkInfo ) {
2671                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
2672                         }
2673                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
2674                         if( $talkInfo ) {
2675                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
2676                         }
2677                         $wgOut->addHTML( '</ul>' );
2678
2679                 }
2680         }
2681
2682         /**
2683          * Return the total number of edits and number of unique editors
2684          * on a given page. If page does not exist, returns false.
2685          *
2686          * @param Title $title
2687          * @return array
2688          * @private
2689          */
2690         function pageCountInfo( $title ) {
2691                 $id = $title->getArticleId();
2692                 if( $id == 0 ) {
2693                         return false;
2694                 }
2695
2696                 $dbr =& wfGetDB( DB_SLAVE );
2697
2698                 $rev_clause = array( 'rev_page' => $id );
2699                 $fname = 'Article::pageCountInfo';
2700
2701                 $edits = $dbr->selectField(
2702                         'revision',
2703                         'COUNT(rev_page)',
2704                         $rev_clause,
2705                         $fname,
2706                         $this->getSelectOptions() );
2707
2708                 $authors = $dbr->selectField(
2709                         'revision',
2710                         'COUNT(DISTINCT rev_user_text)',
2711                         $rev_clause,
2712                         $fname,
2713                         $this->getSelectOptions() );
2714
2715                 return array( 'edits' => $edits, 'authors' => $authors );
2716         }
2717
2718         /**
2719          * Return a list of templates used by this article.
2720          * Uses the templatelinks table
2721          *
2722          * @return array Array of Title objects
2723          */
2724         function getUsedTemplates() {
2725                 $result = array();
2726                 $id = $this->mTitle->getArticleID();
2727                 if( $id == 0 ) {
2728                         return array();
2729                 }
2730
2731                 $dbr =& wfGetDB( DB_SLAVE );
2732                 $res = $dbr->select( array( 'templatelinks' ),
2733                         array( 'tl_namespace', 'tl_title' ),
2734                         array( 'tl_from' => $id ),
2735                         'Article:getUsedTemplates' );
2736                 if ( false !== $res ) {
2737                         if ( $dbr->numRows( $res ) ) {
2738                                 while ( $row = $dbr->fetchObject( $res ) ) {
2739                                         $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2740                                 }
2741                         }
2742                 }
2743                 $dbr->freeResult( $res );
2744                 return $result;
2745         }
2746 }
2747
2748 ?>