includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @package MediaWiki
   5  */
   6
   7 /**
   8  * Need the CacheManager to be loaded
   9  */
  10 require_once( 'CacheManager.php' );
  11 require_once( 'Revision.php' );
  12
  13 $wgArticleCurContentFields = false;
  14 $wgArticleOldContentFields = false;
  15
  16 /**
  17  * Class representing a MediaWiki article and history.
  18  *
  19  * See design.txt for an overview.
  20  * Note: edit user interface and cache support functions have been
  21  * moved to separate EditPage and CacheManager classes.
  22  *
  23  * @package MediaWiki
  24  */
  25 class Article {
  26         /**@{{
  27          * @private
  28          */
  29         var $mComment;                  //!<
  30         var $mContent;                  //!<
  31         var $mContentLoaded;    //!<
  32         var $mCounter;                  //!<
  33         var $mFileCache;                //!<
  34         var $mForUpdate;                //!<
  35         var $mGoodAdjustment;   //!<
  36         var $mId;                               //!<
  37         var $mLatest;                   //!<
  38         var $mMinorEdit;                //!<
  39         var $mOldId;                    //!<
  40         var $mRedirectedFrom;   //!<
  41         var $mRedirectUrl;              //!<
  42         var $mRevIdFetched;             //!<
  43         var $mRevision;                 //!<
  44         var $mTable;                    //!<
  45         var $mTimestamp;                //!<
  46         var $mTitle;                    //!<
  47         var $mTotalAdjustment;  //!<
  48         var $mTouched;                  //!<
  49         var $mUser;                             //!<
  50         var $mUserText;                 //!<
  51         /**@}}*/
  52
  53         /**
  54          * Constructor and clear the article
  55          * @param $title Reference to a Title object.
  56          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  57          */
  58         function Article( &$title, $oldId = null ) {
  59                 $this->mTitle =& $title;
  60                 $this->mOldId = $oldId;
  61                 $this->clear();
  62         }
  63
  64         /**
  65          * Tell the page view functions that this view was redirected
  66          * from another page on the wiki.
  67          * @param $from Title object.
  68          */
  69         function setRedirectedFrom( $from ) {
  70                 $this->mRedirectedFrom = $from;
  71         }
  72
  73         /**
  74          * @return mixed false, Title of in-wiki target, or string with URL
  75          */
  76         function followRedirect() {
  77                 $text = $this->getContent();
  78                 $rt = Title::newFromRedirect( $text );
  79
  80                 # process if title object is valid and not special:userlogout
  81                 if( $rt ) {
  82                         if( $rt->getInterwiki() != '' ) {
  83                                 if( $rt->isLocal() ) {
  84                                         // Offsite wikis need an HTTP redirect.
  85                                         //
  86                                         // This can be hard to reverse and may produce loops,
  87                                         // so they may be disabled in the site configuration.
  88
  89                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
  90                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
  91                                 }
  92                         } else {
  93                                 if( $rt->getNamespace() == NS_SPECIAL ) {
  94                                         // Gotta hand redirects to special pages differently:
  95                                         // Fill the HTTP response "Location" header and ignore
  96                                         // the rest of the page we're on.
  97                                         //
  98                                         // This can be hard to reverse, so they may be disabled.
  99
 100                                         if( $rt->getNamespace() == NS_SPECIAL && $rt->getText() == 'Userlogout' ) {
 101                                                 // rolleyes
 102                                         } else {
 103                                                 return $rt->getFullURL();
 104                                         }
 105                                 }
 106                                 return $rt;
 107                         }
 108                 }
 109
 110                 // No or invalid redirect
 111                 return false;
 112         }
 113
 114         /**
 115          * get the title object of the article
 116          */
 117         function getTitle() {
 118                 return $this->mTitle;
 119         }
 120
 121         /**
 122           * Clear the object
 123           * @private
 124           */
 125         function clear() {
 126                 $this->mDataLoaded    = false;
 127                 $this->mContentLoaded = false;
 128
 129                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 130                 $this->mRedirectedFrom = null; # Title object if set
 131                 $this->mUserText =
 132                 $this->mTimestamp = $this->mComment = $this->mFileCache = '';
 133                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 134                 $this->mTouched = '19700101000000';
 135                 $this->mForUpdate = false;
 136                 $this->mIsRedirect = false;
 137                 $this->mRevIdFetched = 0;
 138                 $this->mRedirectUrl = false;
 139                 $this->mLatest = false;
 140         }
 141
 142         /**
 143          * Note that getContent/loadContent do not follow redirects anymore.
 144          * If you need to fetch redirectable content easily, try
 145          * the shortcut in Article::followContent()
 146          * FIXME
 147          * @todo There are still side-effects in this!
 148          *        In general, you should use the Revision class, not Article,
 149          *        to fetch text for purposes other than page views.
 150          *
 151          * @return Return the text of this revision
 152         */
 153         function getContent() {
 154                 global $wgRequest, $wgUser, $wgOut;
 155
 156                 # Get variables from query string :P
 157                 $action = $wgRequest->getText( 'action', 'view' );
 158                 $section = $wgRequest->getText( 'section' );
 159                 $preload = $wgRequest->getText( 'preload' );
 160
 161                 $fname =  'Article::getContent';
 162                 wfProfileIn( $fname );
 163
 164                 if ( 0 == $this->getID() ) {
 165                         if ( 'edit' == $action ) {
 166                                 wfProfileOut( $fname );
 167
 168                                 # If requested, preload some text.
 169                                 $text=$this->getPreloadedText($preload);
 170
 171                                 # We used to put MediaWiki:Newarticletext here if
 172                                 # $text was empty at this point.
 173                                 # This is now shown above the edit box instead.
 174                                 return $text;
 175                         }
 176                         wfProfileOut( $fname );
 177                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 178
 179                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 180                                 $ret = wfMsgWeirdKey ( $this->mTitle->getText() ) ;
 181                         } else {
 182                                 $ret = wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' );
 183                         }
 184
 185                         return "<div class='noarticletext'>$ret</div>";
 186                 } else {
 187                         $this->loadContent();
 188                         if($action=='edit') {
 189                                 if($section!='') {
 190                                         if($section=='new') {
 191                                                 wfProfileOut( $fname );
 192                                                 $text=$this->getPreloadedText($preload);
 193                                                 return $text;
 194                                         }
 195
 196                                         # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
 197                                         # comments to be stripped as well)
 198                                         $rv=$this->getSection($this->mContent,$section);
 199                                         wfProfileOut( $fname );
 200                                         return $rv;
 201                                 }
 202                         }
 203                         wfProfileOut( $fname );
 204                         return $this->mContent;
 205                 }
 206         }
 207
 208         /**
 209          * Get the contents of a page from its title and remove includeonly tags
 210          *
 211          * @param $preload String: the title of the page.
 212          * @return string The contents of the page.
 213          */
 214         function getPreloadedText($preload) {
 215                 if ( $preload === '' )
 216                         return '';
 217                 else {
 218                         $preloadTitle = Title::newFromText( $preload );
 219                         if ( isset( $preloadTitle ) && $preloadTitle->userCanRead() ) {
 220                                 $rev=Revision::newFromTitle($preloadTitle);
 221                                 if ( is_object( $rev ) ) {
 222                                         $text = $rev->getText();
 223                                         // TODO FIXME: AAAAAAAAAAA, this shouldn't be implementing
 224                                         // its own mini-parser! -ævar
 225                                         $text = preg_replace( '~</?includeonly>~', '', $text );
 226                                         return $text;
 227                                 } else
 228                                         return '';
 229                         }
 230                 }
 231         }
 232
 233         /**
 234          * This function returns the text of a section, specified by a number ($section).
 235          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 236          * the first section before any such heading (section 0).
 237          *
 238          * If a section contains subsections, these are also returned.
 239          *
 240          * @param $text String: text to look in
 241          * @param $section Integer: section number
 242          * @return string text of the requested section
 243          */
 244         function getSection($text,$section) {
 245
 246                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
 247                 # comments to be stripped as well)
 248                 $striparray=array();
 249                 $parser=new Parser();
 250                 $parser->mOutputType=OT_WIKI;
 251                 $parser->mOptions = new ParserOptions();
 252                 $striptext=$parser->strip($text, $striparray, true);
 253
 254                 # now that we can be sure that no pseudo-sections are in the source,
 255                 # split it up by section
 256                 $secs =
 257                   preg_split(
 258                   '/(^=+.+?=+|^<h[1-6].*?>.*?<\/h[1-6].*?>)(?!\S)/mi',
 259                   $striptext, -1,
 260                   PREG_SPLIT_DELIM_CAPTURE);
 261                 if($section==0) {
 262                         $rv=$secs[0];
 263                 } else {
 264                         $headline=$secs[$section*2-1];
 265                         preg_match( '/^(=+).+?=+|^<h([1-6]).*?>.*?<\/h[1-6].*?>(?!\S)/mi',$headline,$matches);
 266                         $hlevel=$matches[1];
 267
 268                         # translate wiki heading into level
 269                         if(strpos($hlevel,'=')!==false) {
 270                                 $hlevel=strlen($hlevel);
 271                         }
 272
 273                         $rv=$headline. $secs[$section*2];
 274                         $count=$section+1;
 275
 276                         $break=false;
 277                         while(!empty($secs[$count*2-1]) && !$break) {
 278
 279                                 $subheadline=$secs[$count*2-1];
 280                                 preg_match( '/^(=+).+?=+|^<h([1-6]).*?>.*?<\/h[1-6].*?>(?!\S)/mi',$subheadline,$matches);
 281                                 $subhlevel=$matches[1];
 282                                 if(strpos($subhlevel,'=')!==false) {
 283                                         $subhlevel=strlen($subhlevel);
 284                                 }
 285                                 if($subhlevel > $hlevel) {
 286                                         $rv.=$subheadline.$secs[$count*2];
 287                                 }
 288                                 if($subhlevel <= $hlevel) {
 289                                         $break=true;
 290                                 }
 291                                 $count++;
 292
 293                         }
 294                 }
 295                 # reinsert stripped tags
 296                 $rv=$parser->unstrip($rv,$striparray);
 297                 $rv=$parser->unstripNoWiki($rv,$striparray);
 298                 $rv=trim($rv);
 299                 return $rv;
 300
 301         }
 302
 303         /**
 304          * @return int The oldid of the article that is to be shown, 0 for the
 305          *             current revision
 306          */
 307         function getOldID() {
 308                 if ( is_null( $this->mOldId ) ) {
 309                         $this->mOldId = $this->getOldIDFromRequest();
 310                 }
 311                 return $this->mOldId;
 312         }
 313
 314         /**
 315          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 316          *
 317          * @return int The old id for the request
 318          */
 319         function getOldIDFromRequest() {
 320                 global $wgRequest;
 321                 $this->mRedirectUrl = false;
 322                 $oldid = $wgRequest->getVal( 'oldid' );
 323                 if ( isset( $oldid ) ) {
 324                         $oldid = intval( $oldid );
 325                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 326                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 327                                 if ( $nextid  ) {
 328                                         $oldid = $nextid;
 329                                 } else {
 330                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 331                                 }
 332                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 333                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 334                                 if ( $previd ) {
 335                                         $oldid = $previd;
 336                                 } else {
 337                                         # TODO
 338                                 }
 339                         }
 340                         # unused:
 341                         # $lastid = $oldid;
 342                 }
 343                 if ( !$oldid ) {
 344                         $oldid = 0;
 345                 }
 346                 return $oldid;
 347         }
 348
 349         /**
 350          * Load the revision (including text) into this object
 351          */
 352         function loadContent() {
 353                 if ( $this->mContentLoaded ) return;
 354
 355                 # Query variables :P
 356                 $oldid = $this->getOldID();
 357
 358                 # Pre-fill content with error message so that if something
 359                 # fails we'll have something telling us what we intended.
 360
 361                 $t = $this->mTitle->getPrefixedText();
 362
 363                 $this->mOldId = $oldid;
 364                 $this->fetchContent( $oldid );
 365         }
 366
 367
 368         /**
 369          * Fetch a page record with the given conditions
 370          * @param Database $dbr
 371          * @param array    $conditions
 372          * @private
 373          */
 374         function pageData( &$dbr, $conditions ) {
 375                 $fields = array(
 376                                 'page_id',
 377                                 'page_namespace',
 378                                 'page_title',
 379                                 'page_restrictions',
 380                                 'page_counter',
 381                                 'page_is_redirect',
 382                                 'page_is_new',
 383                                 'page_random',
 384                                 'page_touched',
 385                                 'page_latest',
 386                                 'page_len' ) ;
 387                 wfRunHooks( 'ArticlePageDataBefore', array( &$this , &$fields ) )       ;
 388                 $row = $dbr->selectRow( 'page',
 389                         $fields,
 390                         $conditions,
 391                         'Article::pageData' );
 392                 wfRunHooks( 'ArticlePageDataAfter', array( &$this , &$row ) )   ;
 393                 return $row ;
 394         }
 395
 396         /**
 397          * @param Database $dbr
 398          * @param Title $title
 399          */
 400         function pageDataFromTitle( &$dbr, $title ) {
 401                 return $this->pageData( $dbr, array(
 402                         'page_namespace' => $title->getNamespace(),
 403                         'page_title'     => $title->getDBkey() ) );
 404         }
 405
 406         /**
 407          * @param Database $dbr
 408          * @param int $id
 409          */
 410         function pageDataFromId( &$dbr, $id ) {
 411                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 412         }
 413
 414         /**
 415          * Set the general counter, title etc data loaded from
 416          * some source.
 417          *
 418          * @param object $data
 419          * @private
 420          */
 421         function loadPageData( $data = 'fromdb' ) {
 422                 if ( $data === 'fromdb' ) {
 423                         $dbr =& $this->getDB();
 424                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 425                 }
 426
 427                 $lc =& LinkCache::singleton();
 428                 if ( $data ) {
 429                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle );
 430
 431                         $this->mTitle->mArticleID = $data->page_id;
 432                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 433                         $this->mTitle->mRestrictionsLoaded = true;
 434
 435                         $this->mCounter     = $data->page_counter;
 436                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 437                         $this->mIsRedirect  = $data->page_is_redirect;
 438                         $this->mLatest      = $data->page_latest;
 439                 } else {
 440                         if ( is_object( $this->mTitle ) ) {
 441                                 $lc->addBadLinkObj( $this->mTitle );
 442                         }
 443                         $this->mTitle->mArticleID = 0;
 444                 }
 445
 446                 $this->mDataLoaded  = true;
 447         }
 448
 449         /**
 450          * Get text of an article from database
 451          * Does *NOT* follow redirects.
 452          * @param int $oldid 0 for whatever the latest revision is
 453          * @return string
 454          */
 455         function fetchContent( $oldid = 0 ) {
 456                 if ( $this->mContentLoaded ) {
 457                         return $this->mContent;
 458                 }
 459
 460                 $dbr =& $this->getDB();
 461                 $fname = 'Article::fetchContent';
 462
 463                 # Pre-fill content with error message so that if something
 464                 # fails we'll have something telling us what we intended.
 465                 $t = $this->mTitle->getPrefixedText();
 466                 if( $oldid ) {
 467                         $t .= ',oldid='.$oldid;
 468                 }
 469                 $this->mContent = wfMsg( 'missingarticle', $t ) ;
 470
 471                 if( $oldid ) {
 472                         $revision = Revision::newFromId( $oldid );
 473                         if( is_null( $revision ) ) {
 474                                 wfDebug( "$fname failed to retrieve specified revision, id $oldid\n" );
 475                                 return false;
 476                         }
 477                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 478                         if( !$data ) {
 479                                 wfDebug( "$fname failed to get page data linked to revision id $oldid\n" );
 480                                 return false;
 481                         }
 482                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 483                         $this->loadPageData( $data );
 484                 } else {
 485                         if( !$this->mDataLoaded ) {
 486                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 487                                 if( !$data ) {
 488                                         wfDebug( "$fname failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 489                                         return false;
 490                                 }
 491                                 $this->loadPageData( $data );
 492                         }
 493                         $revision = Revision::newFromId( $this->mLatest );
 494                         if( is_null( $revision ) ) {
 495                                 wfDebug( "$fname failed to retrieve current page, rev_id {$data->page_latest}\n" );
 496                                 return false;
 497                         }
 498                 }
 499
 500                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 501                 // We should instead work with the Revision object when we need it...
 502                 $this->mContent = $revision->userCan( MW_REV_DELETED_TEXT ) ? $revision->getRawText() : "";
 503                 //$this->mContent   = $revision->getText();
 504
 505                 $this->mUser      = $revision->getUser();
 506                 $this->mUserText  = $revision->getUserText();
 507                 $this->mComment   = $revision->getComment();
 508                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 509
 510                 $this->mRevIdFetched = $revision->getID();
 511                 $this->mContentLoaded = true;
 512                 $this->mRevision =& $revision;
 513
 514                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 515
 516                 return $this->mContent;
 517         }
 518
 519         /**
 520          * Read/write accessor to select FOR UPDATE
 521          *
 522          * @param $x Mixed: FIXME
 523          */
 524         function forUpdate( $x = NULL ) {
 525                 return wfSetVar( $this->mForUpdate, $x );
 526         }
 527
 528         /**
 529          * Get the database which should be used for reads
 530          *
 531          * @return Database
 532          */
 533         function &getDB() {
 534                 $ret =& wfGetDB( DB_MASTER );
 535                 return $ret;
 536         }
 537
 538         /**
 539          * Get options for all SELECT statements
 540          *
 541          * @param $options Array: an optional options array which'll be appended to
 542          *                       the default
 543          * @return Array: options
 544          */
 545         function getSelectOptions( $options = '' ) {
 546                 if ( $this->mForUpdate ) {
 547                         if ( is_array( $options ) ) {
 548                                 $options[] = 'FOR UPDATE';
 549                         } else {
 550                                 $options = 'FOR UPDATE';
 551                         }
 552                 }
 553                 return $options;
 554         }
 555
 556         /**
 557          * @return int Page ID
 558          */
 559         function getID() {
 560                 if( $this->mTitle ) {
 561                         return $this->mTitle->getArticleID();
 562                 } else {
 563                         return 0;
 564                 }
 565         }
 566
 567         /**
 568          * @return bool Whether or not the page exists in the database
 569          */
 570         function exists() {
 571                 return $this->getId() != 0;
 572         }
 573
 574         /**
 575          * @return int The view count for the page
 576          */
 577         function getCount() {
 578                 if ( -1 == $this->mCounter ) {
 579                         $id = $this->getID();
 580                         if ( $id == 0 ) {
 581                                 $this->mCounter = 0;
 582                         } else {
 583                                 $dbr =& wfGetDB( DB_SLAVE );
 584                                 $this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
 585                                         'Article::getCount', $this->getSelectOptions() );
 586                         }
 587                 }
 588                 return $this->mCounter;
 589         }
 590
 591         /**
 592          * Determine whether a page  would be suitable for being counted as an
 593          * article in the site_stats table based on the title & its content
 594          *
 595          * @param $text String: text to analyze
 596          * @return bool
 597          */
 598         function isCountable( $text ) {
 599                 global $wgUseCommaCount;
 600
 601                 $token = $wgUseCommaCount ? ',' : '[[';
 602                 return
 603                         $this->mTitle->getNamespace() == NS_MAIN
 604                         && ! $this->isRedirect( $text )
 605                         && in_string( $token, $text );
 606         }
 607
 608         /**
 609          * Tests if the article text represents a redirect
 610          *
 611          * @param $text String: FIXME
 612          * @return bool
 613          */
 614         function isRedirect( $text = false ) {
 615                 if ( $text === false ) {
 616                         $this->loadContent();
 617                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 618                 } else {
 619                         $titleObj = Title::newFromRedirect( $text );
 620                 }
 621                 return $titleObj !== NULL;
 622         }
 623
 624         /**
 625          * Returns true if the currently-referenced revision is the current edit
 626          * to this page (and it exists).
 627          * @return bool
 628          */
 629         function isCurrent() {
 630                 return $this->exists() &&
 631                         isset( $this->mRevision ) &&
 632                         $this->mRevision->isCurrent();
 633         }
 634
 635         /**
 636          * Loads everything except the text
 637          * This isn't necessary for all uses, so it's only done if needed.
 638          * @private
 639          */
 640         function loadLastEdit() {
 641                 if ( -1 != $this->mUser )
 642                         return;
 643
 644                 # New or non-existent articles have no user information
 645                 $id = $this->getID();
 646                 if ( 0 == $id ) return;
 647
 648                 $this->mLastRevision = Revision::loadFromPageId( $this->getDB(), $id );
 649                 if( !is_null( $this->mLastRevision ) ) {
 650                         $this->mUser      = $this->mLastRevision->getUser();
 651                         $this->mUserText  = $this->mLastRevision->getUserText();
 652                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 653                         $this->mComment   = $this->mLastRevision->getComment();
 654                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 655                         $this->mRevIdFetched = $this->mLastRevision->getID();
 656                 }
 657         }
 658
 659         function getTimestamp() {
 660                 // Check if the field has been filled by ParserCache::get()
 661                 if ( !$this->mTimestamp ) {
 662                         $this->loadLastEdit();
 663                 }
 664                 return wfTimestamp(TS_MW, $this->mTimestamp);
 665         }
 666
 667         function getUser() {
 668                 $this->loadLastEdit();
 669                 return $this->mUser;
 670         }
 671
 672         function getUserText() {
 673                 $this->loadLastEdit();
 674                 return $this->mUserText;
 675         }
 676
 677         function getComment() {
 678                 $this->loadLastEdit();
 679                 return $this->mComment;
 680         }
 681
 682         function getMinorEdit() {
 683                 $this->loadLastEdit();
 684                 return $this->mMinorEdit;
 685         }
 686
 687         function getRevIdFetched() {
 688                 $this->loadLastEdit();
 689                 return $this->mRevIdFetched;
 690         }
 691
 692         /**
 693          * @todo Document, fixme $offset never used.
 694          * @param $limit Integer: default 0.
 695          * @param $offset Integer: default 0.
 696          */
 697         function getContributors($limit = 0, $offset = 0) {
 698                 $fname = 'Article::getContributors';
 699
 700                 # XXX: this is expensive; cache this info somewhere.
 701
 702                 $title = $this->mTitle;
 703                 $contribs = array();
 704                 $dbr =& wfGetDB( DB_SLAVE );
 705                 $revTable = $dbr->tableName( 'revision' );
 706                 $userTable = $dbr->tableName( 'user' );
 707                 $encDBkey = $dbr->addQuotes( $title->getDBkey() );
 708                 $ns = $title->getNamespace();
 709                 $user = $this->getUser();
 710                 $pageId = $this->getId();
 711
 712                 $sql = "SELECT rev_user, rev_user_text, user_real_name, MAX(rev_timestamp) as timestamp
 713                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 714                         WHERE rev_page = $pageId
 715                         AND rev_user != $user
 716                         GROUP BY rev_user, rev_user_text, user_real_name
 717                         ORDER BY timestamp DESC";
 718
 719                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 720                 $sql .= ' '. $this->getSelectOptions();
 721
 722                 $res = $dbr->query($sql, $fname);
 723
 724                 while ( $line = $dbr->fetchObject( $res ) ) {
 725                         $contribs[] = array($line->rev_user, $line->rev_user_text, $line->user_real_name);
 726                 }
 727
 728                 $dbr->freeResult($res);
 729                 return $contribs;
 730         }
 731
 732         /**
 733          * This is the default action of the script: just view the page of
 734          * the given title.
 735         */
 736         function view() {
 737                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 738                 global $wgEnableParserCache, $wgStylePath, $wgUseRCPatrol, $wgParser;
 739                 global $wgUseTrackbacks;
 740                 $sk = $wgUser->getSkin();
 741
 742                 $fname = 'Article::view';
 743                 wfProfileIn( $fname );
 744                 $parserCache =& ParserCache::singleton();
 745                 # Get variables from query string
 746                 $oldid = $this->getOldID();
 747
 748                 # getOldID may want us to redirect somewhere else
 749                 if ( $this->mRedirectUrl ) {
 750                         $wgOut->redirect( $this->mRedirectUrl );
 751                         wfProfileOut( $fname );
 752                         return;
 753                 }
 754
 755                 $diff = $wgRequest->getVal( 'diff' );
 756                 $rcid = $wgRequest->getVal( 'rcid' );
 757                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 758
 759                 $wgOut->setArticleFlag( true );
 760                 $wgOut->setRobotpolicy( 'index,follow' );
 761                 # If we got diff and oldid in the query, we want to see a
 762                 # diff page instead of the article.
 763
 764                 if ( !is_null( $diff ) ) {
 765                         require_once( 'DifferenceEngine.php' );
 766                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 767
 768                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid );
 769                         // DifferenceEngine directly fetched the revision:
 770                         $this->mRevIdFetched = $de->mNewid;
 771                         $de->showDiffPage();
 772
 773                         if( $diff == 0 ) {
 774                                 # Run view updates for current revision only
 775                                 $this->viewUpdates();
 776                         }
 777                         wfProfileOut( $fname );
 778                         return;
 779                 }
 780
 781                 if ( empty( $oldid ) && $this->checkTouched() ) {
 782                         $wgOut->setETag($parserCache->getETag($this, $wgUser));
 783
 784                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 785                                 wfProfileOut( $fname );
 786                                 return;
 787                         } else if ( $this->tryFileCache() ) {
 788                                 # tell wgOut that output is taken care of
 789                                 $wgOut->disable();
 790                                 $this->viewUpdates();
 791                                 wfProfileOut( $fname );
 792                                 return;
 793                         }
 794                 }
 795                 # Should the parser cache be used?
 796                 $pcache = $wgEnableParserCache &&
 797                         intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
 798                         $this->exists() &&
 799                         empty( $oldid );
 800                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 801                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 802                         wfIncrStats( 'pcache_miss_stub' );
 803                 }
 804
 805                 $wasRedirected = false;
 806                 if ( isset( $this->mRedirectedFrom ) ) {
 807                         // This is an internally redirected page view.
 808                         // We'll need a backlink to the source page for navigation.
 809                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 810                                 $sk = $wgUser->getSkin();
 811                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 812                                 $s = wfMsg( 'redirectedfrom', $redir );
 813                                 $wgOut->setSubtitle( $s );
 814                                 $wasRedirected = true;
 815                         }
 816                 } elseif ( !empty( $rdfrom ) ) {
 817                         // This is an externally redirected view, from some other wiki.
 818                         // If it was reported from a trusted site, supply a backlink.
 819                         global $wgRedirectSources;
 820                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 821                                 $sk = $wgUser->getSkin();
 822                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 823                                 $s = wfMsg( 'redirectedfrom', $redir );
 824                                 $wgOut->setSubtitle( $s );
 825                                 $wasRedirected = true;
 826                         }
 827                 }
 828
 829                 $outputDone = false;
 830                 if ( $pcache ) {
 831                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 832                                 $outputDone = true;
 833                         }
 834                 }
 835                 if ( !$outputDone ) {
 836                         $text = $this->getContent();
 837                         if ( $text === false ) {
 838                                 # Failed to load, replace text with error message
 839                                 $t = $this->mTitle->getPrefixedText();
 840                                 if( $oldid ) {
 841                                         $t .= ',oldid='.$oldid;
 842                                         $text = wfMsg( 'missingarticle', $t );
 843                                 } else {
 844                                         $text = wfMsg( 'noarticletext', $t );
 845                                 }
 846                         }
 847
 848                         # Another whitelist check in case oldid is altering the title
 849                         if ( !$this->mTitle->userCanRead() ) {
 850                                 $wgOut->loginToUse();
 851                                 $wgOut->output();
 852                                 exit;
 853                         }
 854
 855                         # We're looking at an old revision
 856
 857                         if ( !empty( $oldid ) ) {
 858                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 859                                 if( is_null( $this->mRevision ) ) {
 860                                         // FIXME: This would be a nice place to load the 'no such page' text.
 861                                 } else {
 862                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 863                                         if( $this->mRevision->isDeleted( MW_REV_DELETED_TEXT ) ) {
 864                                                 if( !$this->mRevision->userCan( MW_REV_DELETED_TEXT ) ) {
 865                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-permission' ) );
 866                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 867                                                         return;
 868                                                 } else {
 869                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-view' ) );
 870                                                         // and we are allowed to see...
 871                                                 }
 872                                         }
 873                                 }
 874
 875                         }
 876                 }
 877                 if( !$outputDone ) {
 878                         /**
 879                          * @fixme: this hook doesn't work most of the time, as it doesn't
 880                          * trigger when the parser cache is used.
 881                          */
 882                         wfRunHooks( 'ArticleViewHeader', array( &$this ) ) ;
 883                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 884                         # wrap user css and user js in pre and don't parse
 885                         # XXX: use $this->mTitle->usCssJsSubpage() when php is fixed/ a workaround is found
 886                         if (
 887                                 $this->mTitle->getNamespace() == NS_USER &&
 888                                 preg_match('/\\/[\\w]+\\.(css|js)$/', $this->mTitle->getDBkey())
 889                         ) {
 890                                 $wgOut->addWikiText( wfMsg('clearyourcache'));
 891                                 $wgOut->addHTML( '<pre>'.htmlspecialchars($this->mContent)."\n</pre>" );
 892                         } else if ( $rt = Title::newFromRedirect( $text ) ) {
 893                                 # Display redirect
 894                                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 895                                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 896                                 if( !$wasRedirected ) {
 897                                         $wgOut->setSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 898                                 }
 899                                 $targetUrl = $rt->escapeLocalURL();
 900                                 # fixme unused $titleText :
 901                                 $titleText = htmlspecialchars( $rt->getPrefixedText() );
 902                                 $link = $sk->makeLinkObj( $rt );
 903
 904                                 $wgOut->addHTML( '<img src="'.$imageUrl.'" alt="#REDIRECT" />' .
 905                                   '<span class="redirectText">'.$link.'</span>' );
 906
 907                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 908                                 $wgOut->addParserOutputNoText( $parseout );
 909                         } else if ( $pcache ) {
 910                                 # Display content and save to parser cache
 911                                 $wgOut->addPrimaryWikiText( $text, $this );
 912                         } else {
 913                                 # Display content, don't attempt to save to parser cache
 914
 915                                 # Don't show section-edit links on old revisions... this way lies madness.
 916                                 if( !$this->isCurrent() ) {
 917                                         $oldEditSectionSetting = $wgOut->mParserOptions->setEditSection( false );
 918                                 }
 919                                 # Display content and don't save to parser cache
 920                                 $wgOut->addPrimaryWikiText( $text, $this, false );
 921
 922                                 if( !$this->isCurrent() ) {
 923                                         $wgOut->mParserOptions->setEditSection( $oldEditSectionSetting );
 924                                 }
 925                         }
 926                 }
 927                 /* title may have been set from the cache */
 928                 $t = $wgOut->getPageTitle();
 929                 if( empty( $t ) ) {
 930                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 931                 }
 932
 933                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 934                 if( $this->mTitle->getNamespace() == NS_USER_TALK &&
 935                         User::isIP( $this->mTitle->getText() ) ) {
 936                         $wgOut->addWikiText( wfMsg('anontalkpagetext') );
 937                 }
 938
 939                 # If we have been passed an &rcid= parameter, we want to give the user a
 940                 # chance to mark this new article as patrolled.
 941                 if ( $wgUseRCPatrol && !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) ) {
 942                         $wgOut->addHTML(
 943                                 "<div class='patrollink'>" .
 944                                         wfMsg ( 'markaspatrolledlink',
 945                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsg('markaspatrolledtext'), "action=markpatrolled&rcid=$rcid" )
 946                                         ) .
 947                                 '</div>'
 948                          );
 949                 }
 950
 951                 # Trackbacks
 952                 if ($wgUseTrackbacks)
 953                         $this->addTrackbacks();
 954
 955                 $this->viewUpdates();
 956                 wfProfileOut( $fname );
 957         }
 958
 959         function addTrackbacks() {
 960                 global $wgOut, $wgUser;
 961
 962                 $dbr =& wfGetDB(DB_SLAVE);
 963                 $tbs = $dbr->select(
 964                                 /* FROM   */ 'trackbacks',
 965                                 /* SELECT */ array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
 966                                 /* WHERE  */ array('tb_page' => $this->getID())
 967                 );
 968
 969                 if (!$dbr->numrows($tbs))
 970                         return;
 971
 972                 $tbtext = "";
 973                 while ($o = $dbr->fetchObject($tbs)) {
 974                         $rmvtxt = "";
 975                         if ($wgUser->isAllowed( 'trackback' )) {
 976                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid="
 977                                                 . $o->tb_id . "&token=" . $wgUser->editToken());
 978                                 $rmvtxt = wfMsg('trackbackremove', $delurl);
 979                         }
 980                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
 981                                         $o->tb_title,
 982                                         $o->tb_url,
 983                                         $o->tb_ex,
 984                                         $o->tb_name,
 985                                         $rmvtxt);
 986                 }
 987                 $wgOut->addWikitext(wfMsg('trackbackbox', $tbtext));
 988         }
 989
 990         function deletetrackback() {
 991                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
 992
 993                 if (!$wgUser->matchEditToken($wgRequest->getVal('token'))) {
 994                         $wgOut->addWikitext(wfMsg('sessionfailure'));
 995                         return;
 996                 }
 997
 998                 if ((!$wgUser->isAllowed('delete'))) {
 999                         $wgOut->sysopRequired();
1000                         return;
1001                 }
1002
1003                 if (wfReadOnly()) {
1004                         $wgOut->readOnlyPage();
1005                         return;
1006                 }
1007
1008                 $db =& wfGetDB(DB_MASTER);
1009                 $db->delete('trackbacks', array('tb_id' => $wgRequest->getInt('tbid')));
1010                 $wgTitle->invalidateCache();
1011                 $wgOut->addWikiText(wfMsg('trackbackdeleteok'));
1012         }
1013
1014         function render() {
1015                 global $wgOut;
1016
1017                 $wgOut->setArticleBodyOnly(true);
1018                 $this->view();
1019         }
1020
1021         /**
1022          * Handle action=purge
1023          */
1024         function purge() {
1025                 global $wgUser, $wgRequest, $wgOut;
1026
1027                 if ( $wgUser->isLoggedIn() || $wgRequest->wasPosted() ) {
1028                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1029                                 $this->doPurge();
1030                         }
1031                 } else {
1032                         $msg = $wgOut->parse( wfMsg( 'confirm_purge' ) );
1033                         $action = $this->mTitle->escapeLocalURL( 'action=purge' );
1034                         $button = htmlspecialchars( wfMsg( 'confirm_purge_button' ) );
1035                         $msg = str_replace( '$1',
1036                                 "<form method=\"post\" action=\"$action\">\n" .
1037                                 "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1038                                 "</form>\n", $msg );
1039
1040                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1041                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1042                         $wgOut->addHTML( $msg );
1043                 }
1044         }
1045
1046         /**
1047          * Perform the actions of a page purging
1048          */
1049         function doPurge() {
1050                 global $wgUseSquid;
1051                 // Invalidate the cache
1052                 $this->mTitle->invalidateCache();
1053
1054                 if ( $wgUseSquid ) {
1055                         // Commit the transaction before the purge is sent
1056                         $dbw = wfGetDB( DB_MASTER );
1057                         $dbw->immediateCommit();
1058
1059                         // Send purge
1060                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1061                         $update->doUpdate();
1062                 }
1063                 $this->view();
1064         }
1065
1066         /**
1067          * Insert a new empty page record for this article.
1068          * This *must* be followed up by creating a revision
1069          * and running $this->updateToLatest( $rev_id );
1070          * or else the record will be left in a funky state.
1071          * Best if all done inside a transaction.
1072          *
1073          * @param Database $dbw
1074          * @param string   $restrictions
1075          * @return int     The newly created page_id key
1076          * @private
1077          */
1078         function insertOn( &$dbw, $restrictions = '' ) {
1079                 $fname = 'Article::insertOn';
1080                 wfProfileIn( $fname );
1081
1082                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1083                 $dbw->insert( 'page', array(
1084                         'page_id'           => $page_id,
1085                         'page_namespace'    => $this->mTitle->getNamespace(),
1086                         'page_title'        => $this->mTitle->getDBkey(),
1087                         'page_counter'      => 0,
1088                         'page_restrictions' => $restrictions,
1089                         'page_is_redirect'  => 0, # Will set this shortly...
1090                         'page_is_new'       => 1,
1091                         'page_random'       => wfRandom(),
1092                         'page_touched'      => $dbw->timestamp(),
1093                         'page_latest'       => 0, # Fill this in shortly...
1094                         'page_len'          => 0, # Fill this in shortly...
1095                 ), $fname );
1096                 $newid = $dbw->insertId();
1097
1098                 $this->mTitle->resetArticleId( $newid );
1099
1100                 wfProfileOut( $fname );
1101                 return $newid;
1102         }
1103
1104         /**
1105          * Update the page record to point to a newly saved revision.
1106          *
1107          * @param Database $dbw
1108          * @param Revision $revision For ID number, and text used to set
1109                                      length and redirect status fields
1110          * @param int $lastRevision If given, will not overwrite the page field
1111          *                          when different from the currently set value.
1112          *                          Giving 0 indicates the new page flag should
1113          *                          be set on.
1114          * @return bool true on success, false on failure
1115          * @private
1116          */
1117         function updateRevisionOn( &$dbw, $revision, $lastRevision = null ) {
1118                 $fname = 'Article::updateToRevision';
1119                 wfProfileIn( $fname );
1120
1121                 $conditions = array( 'page_id' => $this->getId() );
1122                 if( !is_null( $lastRevision ) ) {
1123                         # An extra check against threads stepping on each other
1124                         $conditions['page_latest'] = $lastRevision;
1125                 }
1126
1127                 $text = $revision->getText();
1128                 $dbw->update( 'page',
1129                         array( /* SET */
1130                                 'page_latest'      => $revision->getId(),
1131                                 'page_touched'     => $dbw->timestamp(),
1132                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1133                                 'page_is_redirect' => Article::isRedirect( $text ) ? 1 : 0,
1134                                 'page_len'         => strlen( $text ),
1135                         ),
1136                         $conditions,
1137                         $fname );
1138
1139                 wfProfileOut( $fname );
1140                 return ( $dbw->affectedRows() != 0 );
1141         }
1142
1143         /**
1144          * If the given revision is newer than the currently set page_latest,
1145          * update the page record. Otherwise, do nothing.
1146          *
1147          * @param Database $dbw
1148          * @param Revision $revision
1149          */
1150         function updateIfNewerOn( &$dbw, $revision ) {
1151                 $fname = 'Article::updateIfNewerOn';
1152                 wfProfileIn( $fname );
1153
1154                 $row = $dbw->selectRow(
1155                         array( 'revision', 'page' ),
1156                         array( 'rev_id', 'rev_timestamp' ),
1157                         array(
1158                                 'page_id' => $this->getId(),
1159                                 'page_latest=rev_id' ),
1160                         $fname );
1161                 if( $row ) {
1162                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1163                                 wfProfileOut( $fname );
1164                                 return false;
1165                         }
1166                         $prev = $row->rev_id;
1167                 } else {
1168                         # No or missing previous revision; mark the page as new
1169                         $prev = 0;
1170                 }
1171
1172                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev );
1173                 wfProfileOut( $fname );
1174                 return $ret;
1175         }
1176
1177         /**
1178          * Insert a new article into the database
1179          * @private
1180          */
1181         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false ) {
1182                 global $wgUser;
1183
1184                 $fname = 'Article::insertNewArticle';
1185                 wfProfileIn( $fname );
1186
1187                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1188                         &$summary, &$isminor, &$watchthis, NULL ) ) ) {
1189                         wfDebug( "$fname: ArticleSave hook aborted save!\n" );
1190                         wfProfileOut( $fname );
1191                         return false;
1192                 }
1193
1194                 $ns = $this->mTitle->getNamespace();
1195                 $ttl = $this->mTitle->getDBkey();
1196
1197                 # If this is a comment, add the summary as headline
1198                 if($comment && $summary!="") {
1199                         $text="== {$summary} ==\n\n".$text;
1200                 }
1201                 $text = $this->preSaveTransform( $text );
1202
1203
1204                 # Set statistics members
1205                 # We work out if it's countable after PST to avoid counter drift
1206                 # when articles are created with {{subst:}}
1207                 $this->mGoodAdjustment = (int)$this->isCountable( $text );
1208                 $this->mTotalAdjustment = 1;
1209
1210                 /* Silently ignore minoredit if not allowed */
1211                 $isminor = $isminor && $wgUser->isAllowed('minoredit');
1212                 $now = wfTimestampNow();
1213
1214                 $dbw =& wfGetDB( DB_MASTER );
1215
1216                 # Add the page record; stake our claim on this title!
1217                 $newid = $this->insertOn( $dbw );
1218
1219                 # Save the revision text...
1220                 $revision = new Revision( array(
1221                         'page'       => $newid,
1222                         'comment'    => $summary,
1223                         'minor_edit' => $isminor,
1224                         'text'       => $text
1225                         ) );
1226                 $revisionId = $revision->insertOn( $dbw );
1227
1228                 $this->mTitle->resetArticleID( $newid );
1229
1230                 # Update the page record with revision data
1231                 $this->updateRevisionOn( $dbw, $revision, 0 );
1232
1233                 Article::onArticleCreate( $this->mTitle );
1234                 if(!$suppressRC) {
1235                         require_once( 'RecentChange.php' );
1236                         $rcid = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary, 'default',
1237                           '', strlen( $text ), $revisionId );
1238                         # Mark as patrolled if the user can and has the option set
1239                         if( $wgUser->isAllowed( 'patrol' ) && $wgUser->getOption( 'autopatrol' ) ) {
1240                                 RecentChange::markPatrolled( $rcid );
1241                         }
1242                 }
1243
1244                 if ($watchthis) {
1245                         if(!$this->mTitle->userIsWatching()) $this->doWatch();
1246                 } else {
1247                         if ( $this->mTitle->userIsWatching() ) {
1248                                 $this->doUnwatch();
1249                         }
1250                 }
1251
1252                 # The talk page isn't in the regular link tables, so we need to update manually:
1253                 $talkns = $ns ^ 1; # talk -> normal; normal -> talk
1254                 $dbw->update( 'page',
1255                         array( 'page_touched' => $dbw->timestamp($now) ),
1256                         array( 'page_namespace' => $talkns,
1257                                'page_title' => $ttl ),
1258                         $fname );
1259
1260                 # standard deferred updates
1261                 $this->editUpdates( $text, $summary, $isminor, $now, $revisionId );
1262
1263                 $oldid = 0; # new article
1264                 $this->showArticle( $text, wfMsg( 'newarticle' ), false, $isminor, $now, $summary, $oldid );
1265
1266                 wfRunHooks( 'ArticleInsertComplete', array( &$this, &$wgUser, $text,
1267                         $summary, $isminor,
1268                         $watchthis, NULL ) );
1269                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$wgUser, $text,
1270                         $summary, $isminor,
1271                         $watchthis, NULL ) );
1272                 wfProfileOut( $fname );
1273         }
1274
1275         /**
1276          * @return string Complete article text, or null if error
1277          */
1278         function replaceSection($section, $text, $summary = '', $edittime = NULL) {
1279                 $fname = 'Article::replaceSection';
1280                 wfProfileIn( $fname );
1281
1282                 if ($section != '') {
1283                         if( is_null( $edittime ) ) {
1284                                 $rev = Revision::newFromTitle( $this->mTitle );
1285                         } else {
1286                                 $dbw =& wfGetDB( DB_MASTER );
1287                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1288                         }
1289                         if( is_null( $rev ) ) {
1290                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1291                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1292                                 return null;
1293                         }
1294                         $oldtext = $rev->getText();
1295
1296                         if($section=='new') {
1297                                 if($summary) $subject="== {$summary} ==\n\n";
1298                                 $text=$oldtext."\n\n".$subject.$text;
1299                         } else {
1300
1301                                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
1302                                 # comments to be stripped as well)
1303                                 $striparray=array();
1304                                 $parser=new Parser();
1305                                 $parser->mOutputType=OT_WIKI;
1306                                 $parser->mOptions = new ParserOptions();
1307                                 $oldtext=$parser->strip($oldtext, $striparray, true);
1308
1309                                 # now that we can be sure that no pseudo-sections are in the source,
1310                                 # split it up
1311                                 # Unfortunately we can't simply do a preg_replace because that might
1312                                 # replace the wrong section, so we have to use the section counter instead
1313                                 $secs=preg_split('/(^=+.+?=+|^<h[1-6].*?>.*?<\/h[1-6].*?>)(?!\S)/mi',
1314                                   $oldtext,-1,PREG_SPLIT_DELIM_CAPTURE);
1315                                 $secs[$section*2]=$text."\n\n"; // replace with edited
1316
1317                                 # section 0 is top (intro) section
1318                                 if($section!=0) {
1319
1320                                         # headline of old section - we need to go through this section
1321                                         # to determine if there are any subsections that now need to
1322                                         # be erased, as the mother section has been replaced with
1323                                         # the text of all subsections.
1324                                         $headline=$secs[$section*2-1];
1325                                         preg_match( '/^(=+).+?=+|^<h([1-6]).*?>.*?<\/h[1-6].*?>(?!\S)/mi',$headline,$matches);
1326                                         $hlevel=$matches[1];
1327
1328                                         # determine headline level for wikimarkup headings
1329                                         if(strpos($hlevel,'=')!==false) {
1330                                                 $hlevel=strlen($hlevel);
1331                                         }
1332
1333                                         $secs[$section*2-1]=''; // erase old headline
1334                                         $count=$section+1;
1335                                         $break=false;
1336                                         while(!empty($secs[$count*2-1]) && !$break) {
1337
1338                                                 $subheadline=$secs[$count*2-1];
1339                                                 preg_match(
1340                                                  '/^(=+).+?=+|^<h([1-6]).*?>.*?<\/h[1-6].*?>(?!\S)/mi',$subheadline,$matches);
1341                                                 $subhlevel=$matches[1];
1342                                                 if(strpos($subhlevel,'=')!==false) {
1343                                                         $subhlevel=strlen($subhlevel);
1344                                                 }
1345                                                 if($subhlevel > $hlevel) {
1346                                                         // erase old subsections
1347                                                         $secs[$count*2-1]='';
1348                                                         $secs[$count*2]='';
1349                                                 }
1350                                                 if($subhlevel <= $hlevel) {
1351                                                         $break=true;
1352                                                 }
1353                                                 $count++;
1354
1355                                         }
1356
1357                                 }
1358                                 $text=join('',$secs);
1359                                 # reinsert the stuff that we stripped out earlier
1360                                 $text=$parser->unstrip($text,$striparray);
1361                                 $text=$parser->unstripNoWiki($text,$striparray);
1362                         }
1363
1364                 }
1365                 wfProfileOut( $fname );
1366                 return $text;
1367         }
1368
1369         /**
1370          * Change an existing article. Puts the previous version back into the old table, updates RC
1371          * and all necessary caches, mostly via the deferred update array.
1372          *
1373          * It is possible to call this function from a command-line script, but note that you should
1374          * first set $wgUser, and clean up $wgDeferredUpdates after each edit.
1375          */
1376         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1377                 global $wgUser, $wgDBtransactions, $wgUseSquid;
1378                 global $wgPostCommitUpdateList, $wgUseFileCache;
1379
1380                 $fname = 'Article::updateArticle';
1381                 wfProfileIn( $fname );
1382                 $good = true;
1383
1384                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1385                         &$summary, &$minor,
1386                         &$watchthis, &$sectionanchor ) ) ) {
1387                         wfDebug( "$fname: ArticleSave hook aborted save!\n" );
1388                         wfProfileOut( $fname );
1389                         return false;
1390                 }
1391
1392                 $isminor = $minor && $wgUser->isAllowed('minoredit');
1393
1394                 $text = $this->preSaveTransform( $text );
1395                 $dbw =& wfGetDB( DB_MASTER );
1396                 $now = wfTimestampNow();
1397
1398                 # Update article, but only if changed.
1399
1400                 # It's important that we either rollback or complete, otherwise an attacker could
1401                 # overwrite cur entries by sending precisely timed user aborts. Random bored users
1402                 # could conceivably have the same effect, especially if cur is locked for long periods.
1403                 if( !$wgDBtransactions ) {
1404                         $userAbort = ignore_user_abort( true );
1405                 }
1406
1407                 $oldtext = $this->getContent();
1408                 $oldsize = strlen( $oldtext );
1409                 $newsize = strlen( $text );
1410                 $lastRevision = 0;
1411                 $revisionId = 0;
1412
1413                 if ( 0 != strcmp( $text, $oldtext ) ) {
1414                         $this->mGoodAdjustment = (int)$this->isCountable( $text )
1415                           - (int)$this->isCountable( $oldtext );
1416                         $this->mTotalAdjustment = 0;
1417                         $now = wfTimestampNow();
1418
1419                         $lastRevision = $dbw->selectField(
1420                                 'page', 'page_latest', array( 'page_id' => $this->getId() ) );
1421
1422                         $revision = new Revision( array(
1423                                 'page'       => $this->getId(),
1424                                 'comment'    => $summary,
1425                                 'minor_edit' => $isminor,
1426                                 'text'       => $text
1427                                 ) );
1428
1429                         $dbw->immediateCommit();
1430                         $dbw->begin();
1431                         $revisionId = $revision->insertOn( $dbw );
1432
1433                         # Update page
1434                         $ok = $this->updateRevisionOn( $dbw, $revision, $lastRevision );
1435
1436                         if( !$ok ) {
1437                                 /* Belated edit conflict! Run away!! */
1438                                 $good = false;
1439                                 $dbw->rollback();
1440                         } else {
1441                                 # Update recentchanges and purge cache and whatnot
1442                                 require_once( 'RecentChange.php' );
1443                                 $bot = (int)($wgUser->isBot() || $forceBot);
1444                                 $rcid = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $wgUser, $summary,
1445                                         $lastRevision, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1446                                         $revisionId );
1447
1448                                 # Mark as patrolled if the user can do so and has it set in their options
1449                                 if( $wgUser->isAllowed( 'patrol' ) && $wgUser->getOption( 'autopatrol' ) ) {
1450                                         RecentChange::markPatrolled( $rcid );
1451                                 }
1452
1453                                 $dbw->commit();
1454
1455                                 // Update caches outside the main transaction
1456                                 Article::onArticleEdit( $this->mTitle );
1457                         }
1458                 } else {
1459                         // Keep the same revision ID, but do some updates on it
1460                         $revisionId = $this->getRevIdFetched();
1461                 }
1462
1463                 if( !$wgDBtransactions ) {
1464                         ignore_user_abort( $userAbort );
1465                 }
1466
1467                 if ( $good ) {
1468                         if ($watchthis) {
1469                                 if (!$this->mTitle->userIsWatching()) {
1470                                         $dbw->immediateCommit();
1471                                         $dbw->begin();
1472                                         $this->doWatch();
1473                                         $dbw->commit();
1474                                 }
1475                         } else {
1476                                 if ( $this->mTitle->userIsWatching() ) {
1477                                         $dbw->immediateCommit();
1478                                         $dbw->begin();
1479                                         $this->doUnwatch();
1480                                         $dbw->commit();
1481                                 }
1482                         }
1483                         # standard deferred updates
1484                         $this->editUpdates( $text, $summary, $minor, $now, $revisionId );
1485
1486
1487                         $urls = array();
1488                         # Invalidate caches of all articles using this article as a template
1489
1490                         # Template namespace
1491                         # Purge all articles linking here
1492                         $titles = $this->mTitle->getTemplateLinksTo();
1493                         Title::touchArray( $titles );
1494                         if ( $wgUseSquid ) {
1495                                         foreach ( $titles as $title ) {
1496                                                 $urls[] = $title->getInternalURL();
1497                                         }
1498                         }
1499
1500                         # Squid updates
1501                         if ( $wgUseSquid ) {
1502                                 $urls = array_merge( $urls, $this->mTitle->getSquidURLs() );
1503                                 $u = new SquidUpdate( $urls );
1504                                 array_push( $wgPostCommitUpdateList, $u );
1505                         }
1506
1507                         # File cache
1508                         if ( $wgUseFileCache ) {
1509                                 $cm = new CacheManager($this->mTitle);
1510                                 @unlink($cm->fileCacheName());
1511                         }
1512
1513                         $this->showArticle( $text, wfMsg( 'updated' ), $sectionanchor, $isminor, $now, $summary, $lastRevision );
1514                 }
1515                 wfRunHooks( 'ArticleSaveComplete',
1516                         array( &$this, &$wgUser, $text,
1517                         $summary, $minor,
1518                         $watchthis, $sectionanchor ) );
1519                 wfProfileOut( $fname );
1520                 return $good;
1521         }
1522
1523         /**
1524          * After we've either updated or inserted the article, update
1525          * the link tables and redirect to the new page.
1526          * @todo FIXME some function arguments never used
1527          */
1528         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1529                 global $wgOut;
1530
1531                 $fname = 'Article::showArticle';
1532                 wfProfileIn( $fname );
1533
1534                 # Output the redirect
1535                 if( $this->isRedirect( $text ) )
1536                         $r = 'redirect=no';
1537                 else
1538                         $r = '';
1539                 $wgOut->redirect( $this->mTitle->getFullURL( $r ).$sectionanchor );
1540
1541                 wfProfileOut( $fname );
1542         }
1543
1544         /**
1545          * Mark this particular edit as patrolled
1546          */
1547         function markpatrolled() {
1548                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUser;
1549                 $wgOut->setRobotpolicy( 'noindex,follow' );
1550
1551                 # Check RC patrol config. option
1552                 if( !$wgUseRCPatrol ) {
1553                         $wgOut->errorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1554                         return;
1555                 }
1556
1557                 # Check permissions
1558                 if( !$wgUser->isAllowed( 'patrol' ) ) {
1559                         $wgOut->permissionRequired( 'patrol' );
1560                         return;
1561                 }
1562
1563                 $rcid = $wgRequest->getVal( 'rcid' );
1564                 if ( !is_null ( $rcid ) ) {
1565                         if( wfRunHooks( 'MarkPatrolled', array( &$rcid, &$wgUser, false ) ) ) {
1566                                 require_once( 'RecentChange.php' );
1567                                 RecentChange::markPatrolled( $rcid );
1568                                 wfRunHooks( 'MarkPatrolledComplete', array( &$rcid, &$wgUser, false ) );
1569                                 $wgOut->setPagetitle( wfMsg( 'markedaspatrolled' ) );
1570                                 $wgOut->addWikiText( wfMsg( 'markedaspatrolledtext' ) );
1571                         }
1572                         $rcTitle = Title::makeTitle( NS_SPECIAL, 'Recentchanges' );
1573                         $wgOut->returnToMain( false, $rcTitle->getPrefixedText() );
1574                 }
1575                 else {
1576                         $wgOut->errorpage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1577                 }
1578         }
1579
1580         /**
1581          * User-interface handler for the "watch" action
1582          */
1583
1584         function watch() {
1585
1586                 global $wgUser, $wgOut;
1587
1588                 if ( $wgUser->isAnon() ) {
1589                         $wgOut->errorpage( 'watchnologin', 'watchnologintext' );
1590                         return;
1591                 }
1592                 if ( wfReadOnly() ) {
1593                         $wgOut->readOnlyPage();
1594                         return;
1595                 }
1596
1597                 if( $this->doWatch() ) {
1598                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1599                         $wgOut->setRobotpolicy( 'noindex,follow' );
1600
1601                         $link = $this->mTitle->getPrefixedText();
1602                         $text = wfMsg( 'addedwatchtext', $link );
1603                         $wgOut->addWikiText( $text );
1604                 }
1605
1606                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1607         }
1608
1609         /**
1610          * Add this page to $wgUser's watchlist
1611          * @return bool true on successful watch operation
1612          */
1613         function doWatch() {
1614                 global $wgUser;
1615                 if( $wgUser->isAnon() ) {
1616                         return false;
1617                 }
1618
1619                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1620                         $wgUser->addWatch( $this->mTitle );
1621                         $wgUser->saveSettings();
1622
1623                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1624                 }
1625
1626                 return false;
1627         }
1628
1629         /**
1630          * User interface handler for the "unwatch" action.
1631          */
1632         function unwatch() {
1633
1634                 global $wgUser, $wgOut;
1635
1636                 if ( $wgUser->isAnon() ) {
1637                         $wgOut->errorpage( 'watchnologin', 'watchnologintext' );
1638                         return;
1639                 }
1640                 if ( wfReadOnly() ) {
1641                         $wgOut->readOnlyPage();
1642                         return;
1643                 }
1644
1645                 if( $this->doUnwatch() ) {
1646                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1647                         $wgOut->setRobotpolicy( 'noindex,follow' );
1648
1649                         $link = $this->mTitle->getPrefixedText();
1650                         $text = wfMsg( 'removedwatchtext', $link );
1651                         $wgOut->addWikiText( $text );
1652                 }
1653
1654                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1655         }
1656
1657         /**
1658          * Stop watching a page
1659          * @return bool true on successful unwatch
1660          */
1661         function doUnwatch() {
1662                 global $wgUser;
1663                 if( $wgUser->isAnon() ) {
1664                         return false;
1665                 }
1666
1667                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1668                         $wgUser->removeWatch( $this->mTitle );
1669                         $wgUser->saveSettings();
1670
1671                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1672                 }
1673
1674                 return false;
1675         }
1676
1677         /**
1678          * action=protect handler
1679          */
1680         function protect() {
1681                 require_once 'ProtectionForm.php';
1682                 $form = new ProtectionForm( $this );
1683                 $form->show();
1684         }
1685
1686         /**
1687          * action=unprotect handler (alias)
1688          */
1689         function unprotect() {
1690                 $this->protect();
1691         }
1692
1693         /**
1694          * Update the article's restriction field, and leave a log entry.
1695          *
1696          * @param array $limit set of restriction keys
1697          * @param string $reason
1698          * @return bool true on success
1699          */
1700         function updateRestrictions( $limit = array(), $reason = '' ) {
1701                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1702
1703                 $id = $this->mTitle->getArticleID();
1704                 if( !$wgUser->isAllowed( 'protect' ) || wfReadOnly() || $id == 0 ) {
1705                         return false;
1706                 }
1707
1708                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1709                 # we expect a single selection, but the schema allows otherwise.
1710                 $current = array();
1711                 foreach( $wgRestrictionTypes as $action )
1712                         $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1713
1714                 $current = Article::flattenRestrictions( $current );
1715                 $updated = Article::flattenRestrictions( $limit );
1716
1717                 $changed = ( $current != $updated );
1718                 $protect = ( $updated != '' );
1719
1720                 # If nothing's changed, do nothing
1721                 if( $changed ) {
1722                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1723
1724                                 $dbw =& wfGetDB( DB_MASTER );
1725
1726                                 # Prepare a null revision to be added to the history
1727                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $protect ? 'protectedarticle' : 'unprotectedarticle', $this->mTitle->getPrefixedText() ) );
1728                                 if( $reason )
1729                                         $comment .= ": $reason";
1730                                 if( $protect )
1731                                         $comment .= " [$updated]";
1732                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $comment, true );
1733                                 $nullRevId = $nullRevision->insertOn( $dbw );
1734
1735                                 # Update page record
1736                                 $dbw->update( 'page',
1737                                         array( /* SET */
1738                                                 'page_touched' => $dbw->timestamp(),
1739                                                 'page_restrictions' => $updated,
1740                                                 'page_latest' => $nullRevId
1741                                         ), array( /* WHERE */
1742                                                 'page_id' => $id
1743                                         ), 'Article::protect'
1744                                 );
1745                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1746
1747                                 # Update the protection log
1748                                 $log = new LogPage( 'protect' );
1749                                 if( $protect ) {
1750                                         $log->addEntry( 'protect', $this->mTitle, trim( $reason . " [$updated]" ) );
1751                                 } else {
1752                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1753                                 }
1754
1755                         } # End hook
1756                 } # End "changed" check
1757
1758                 return true;
1759         }
1760
1761         /**
1762          * Take an array of page restrictions and flatten it to a string
1763          * suitable for insertion into the page_restrictions field.
1764          * @param array $limit
1765          * @return string
1766          * @private
1767          */
1768         function flattenRestrictions( $limit ) {
1769                 if( !is_array( $limit ) ) {
1770                         wfDebugDieBacktrace( 'Article::flattenRestrictions given non-array restriction set' );
1771                 }
1772                 $bits = array();
1773                 ksort( $limit );
1774                 foreach( $limit as $action => $restrictions ) {
1775                         if( $restrictions != '' ) {
1776                                 $bits[] = "$action=$restrictions";
1777                         }
1778                 }
1779                 return implode( ':', $bits );
1780         }
1781
1782         /*
1783          * UI entry point for page deletion
1784          */
1785         function delete() {
1786                 global $wgUser, $wgOut, $wgRequest;
1787                 $fname = 'Article::delete';
1788                 $confirm = $wgRequest->wasPosted() &&
1789                         $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1790                 $reason = $wgRequest->getText( 'wpReason' );
1791
1792                 # This code desperately needs to be totally rewritten
1793
1794                 # Check permissions
1795                 if( $wgUser->isAllowed( 'delete' ) ) {
1796                         if( $wgUser->isBlocked() ) {
1797                                 $wgOut->blockedPage();
1798                                 return;
1799                         }
1800                 } else {
1801                         $wgOut->permissionRequired( 'delete' );
1802                         return;
1803                 }
1804
1805                 if( wfReadOnly() ) {
1806                         $wgOut->readOnlyPage();
1807                         return;
1808                 }
1809
1810                 $wgOut->setPagetitle( wfMsg( 'confirmdelete' ) );
1811
1812                 # Better double-check that it hasn't been deleted yet!
1813                 $dbw =& wfGetDB( DB_MASTER );
1814                 $conds = $this->mTitle->pageCond();
1815                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, $fname );
1816                 if ( $latest === false ) {
1817                         $wgOut->fatalError( wfMsg( 'cannotdelete' ) );
1818                         return;
1819                 }
1820
1821                 if( $confirm ) {
1822                         $this->doDelete( $reason );
1823                         return;
1824                 }
1825
1826                 # determine whether this page has earlier revisions
1827                 # and insert a warning if it does
1828                 $maxRevisions = 20;
1829                 $authors = $this->getLastNAuthors( $maxRevisions, $latest );
1830
1831                 if( count( $authors ) > 1 && !$confirm ) {
1832                         $skin=$wgUser->getSkin();
1833                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
1834                 }
1835
1836                 # If a single user is responsible for all revisions, find out who they are
1837                 if ( count( $authors ) == $maxRevisions ) {
1838                         // Query bailed out, too many revisions to find out if they're all the same
1839                         $authorOfAll = false;
1840                 } else {
1841                         $authorOfAll = reset( $authors );
1842                         foreach ( $authors as $author ) {
1843                                 if ( $authorOfAll != $author ) {
1844                                         $authorOfAll = false;
1845                                         break;
1846                                 }
1847                         }
1848                 }
1849                 # Fetch article text
1850                 $rev = Revision::newFromTitle( $this->mTitle );
1851
1852                 if( !is_null( $rev ) ) {
1853                         # if this is a mini-text, we can paste part of it into the deletion reason
1854                         $text = $rev->getText();
1855
1856                         #if this is empty, an earlier revision may contain "useful" text
1857                         $blanked = false;
1858                         if( $text == '' ) {
1859                                 $prev = $rev->getPrevious();
1860                                 if( $prev ) {
1861                                         $text = $prev->getText();
1862                                         $blanked = true;
1863                                 }
1864                         }
1865
1866                         $length = strlen( $text );
1867
1868                         # this should not happen, since it is not possible to store an empty, new
1869                         # page. Let's insert a standard text in case it does, though
1870                         if( $length == 0 && $reason === '' ) {
1871                                 $reason = wfMsgForContent( 'exblank' );
1872                         }
1873
1874                         if( $length < 500 && $reason === '' ) {
1875                                 # comment field=255, let's grep the first 150 to have some user
1876                                 # space left
1877                                 global $wgContLang;
1878                                 $text = $wgContLang->truncate( $text, 150, '...' );
1879
1880                                 # let's strip out newlines
1881                                 $text = preg_replace( "/[\n\r]/", '', $text );
1882
1883                                 if( !$blanked ) {
1884                                         if( $authorOfAll === false ) {
1885                                                 $reason = wfMsgForContent( 'excontent', $text );
1886                                         } else {
1887                                                 $reason = wfMsgForContent( 'excontentauthor', $text, $authorOfAll );
1888                                         }
1889                                 } else {
1890                                         $reason = wfMsgForContent( 'exbeforeblank', $text );
1891                                 }
1892                         }
1893                 }
1894
1895                 return $this->confirmDelete( '', $reason );
1896         }
1897
1898         /**
1899          * Get the last N authors
1900          * @param int $num Number of revisions to get
1901          * @param string $revLatest The latest rev_id, selected from the master (optional)
1902          * @return array Array of authors, duplicates not removed
1903          */
1904         function getLastNAuthors( $num, $revLatest = 0 ) {
1905                 $fname = 'Article::getLastNAuthors';
1906                 wfProfileIn( $fname );
1907
1908                 // First try the slave
1909                 // If that doesn't have the latest revision, try the master
1910                 $continue = 2;
1911                 $db =& wfGetDB( DB_SLAVE );
1912                 do {
1913                         $res = $db->select( array( 'page', 'revision' ),
1914                                 array( 'rev_id', 'rev_user_text' ),
1915                                 array(
1916                                         'page_namespace' => $this->mTitle->getNamespace(),
1917                                         'page_title' => $this->mTitle->getDBkey(),
1918                                         'rev_page = page_id'
1919                                 ), $fname, $this->getSelectOptions( array(
1920                                         'ORDER BY' => 'rev_timestamp DESC',
1921                                         'LIMIT' => $num
1922                                 ) )
1923                         );
1924                         if ( !$res ) {
1925                                 wfProfileOut( $fname );
1926                                 return array();
1927                         }
1928                         $row = $db->fetchObject( $res );
1929                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1930                                 $db =& wfGetDB( DB_MASTER );
1931                                 $continue--;
1932                         } else {
1933                                 $continue = 0;
1934                         }
1935                 } while ( $continue );
1936
1937                 $authors = array( $row->rev_user_text );
1938                 while ( $row = $db->fetchObject( $res ) ) {
1939                         $authors[] = $row->rev_user_text;
1940                 }
1941                 wfProfileOut( $fname );
1942                 return $authors;
1943         }
1944
1945         /**
1946          * Output deletion confirmation dialog
1947          */
1948         function confirmDelete( $par, $reason ) {
1949                 global $wgOut, $wgUser;
1950
1951                 wfDebug( "Article::confirmDelete\n" );
1952
1953                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
1954                 $wgOut->setSubtitle( wfMsg( 'deletesub', $sub ) );
1955                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1956                 $wgOut->addWikiText( wfMsg( 'confirmdeletetext' ) );
1957
1958                 $formaction = $this->mTitle->escapeLocalURL( 'action=delete' . $par );
1959
1960                 $confirm = htmlspecialchars( wfMsg( 'deletepage' ) );
1961                 $delcom = htmlspecialchars( wfMsg( 'deletecomment' ) );
1962                 $token = htmlspecialchars( $wgUser->editToken() );
1963
1964                 $wgOut->addHTML( "
1965 <form id='deleteconfirm' method='post' action=\"{$formaction}\">
1966         <table border='0'>
1967                 <tr>
1968                         <td align='right'>
1969                                 <label for='wpReason'>{$delcom}:</label>
1970                         </td>
1971                         <td align='left'>
1972                                 <input type='text' size='60' name='wpReason' id='wpReason' value=\"" . htmlspecialchars( $reason ) . "\" />
1973                         </td>
1974                 </tr>
1975                 <tr>
1976                         <td>&nbsp;</td>
1977                         <td>
1978                                 <input type='submit' name='wpConfirmB' value=\"{$confirm}\" />
1979                         </td>
1980                 </tr>
1981         </table>
1982         <input type='hidden' name='wpEditToken' value=\"{$token}\" />
1983 </form>\n" );
1984
1985                 $wgOut->returnToMain( false );
1986         }
1987
1988
1989         /**
1990          * Perform a deletion and output success or failure messages
1991          */
1992         function doDelete( $reason ) {
1993                 global $wgOut, $wgUser;
1994                 $fname = 'Article::doDelete';
1995                 wfDebug( $fname."\n" );
1996
1997                 if (wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason))) {
1998                         if ( $this->doDeleteArticle( $reason ) ) {
1999                                 $deleted = $this->mTitle->getPrefixedText();
2000
2001                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2002                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2003
2004                                 $loglink = '[[Special:Log/delete|' . wfMsg( 'deletionlog' ) . ']]';
2005                                 $text = wfMsg( 'deletedtext', $deleted, $loglink );
2006
2007                                 $wgOut->addWikiText( $text );
2008                                 $wgOut->returnToMain( false );
2009                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason));
2010                         } else {
2011                                 $wgOut->fatalError( wfMsg( 'cannotdelete' ) );
2012                         }
2013                 }
2014         }
2015
2016         /**
2017          * Back-end article deletion
2018          * Deletes the article with database consistency, writes logs, purges caches
2019          * Returns success
2020          */
2021         function doDeleteArticle( $reason ) {
2022                 global $wgUseSquid, $wgDeferredUpdateList;
2023                 global $wgPostCommitUpdateList, $wgUseTrackbacks;
2024
2025                 $fname = 'Article::doDeleteArticle';
2026                 wfDebug( $fname."\n" );
2027
2028                 $dbw =& wfGetDB( DB_MASTER );
2029                 $ns = $this->mTitle->getNamespace();
2030                 $t = $this->mTitle->getDBkey();
2031                 $id = $this->mTitle->getArticleID();
2032
2033                 if ( $t == '' || $id == 0 ) {
2034                         return false;
2035                 }
2036
2037                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
2038                 array_push( $wgDeferredUpdateList, $u );
2039
2040                 $linksTo = $this->mTitle->getLinksTo();
2041
2042                 # Squid purging
2043                 if ( $wgUseSquid ) {
2044                         $urls = array(
2045                                 $this->mTitle->getInternalURL(),
2046                                 $this->mTitle->getInternalURL( 'history' )
2047                         );
2048
2049                         $u = SquidUpdate::newFromTitles( $linksTo, $urls );
2050                         array_push( $wgPostCommitUpdateList, $u );
2051
2052                 }
2053
2054                 # Client and file cache invalidation
2055                 Title::touchArray( $linksTo );
2056
2057
2058                 // For now, shunt the revision data into the archive table.
2059                 // Text is *not* removed from the text table; bulk storage
2060                 // is left intact to avoid breaking block-compression or
2061                 // immutable storage schemes.
2062                 //
2063                 // For backwards compatibility, note that some older archive
2064                 // table entries will have ar_text and ar_flags fields still.
2065                 //
2066                 // In the future, we may keep revisions and mark them with
2067                 // the rev_deleted field, which is reserved for this purpose.
2068                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2069                         array(
2070                                 'ar_namespace'  => 'page_namespace',
2071                                 'ar_title'      => 'page_title',
2072                                 'ar_comment'    => 'rev_comment',
2073                                 'ar_user'       => 'rev_user',
2074                                 'ar_user_text'  => 'rev_user_text',
2075                                 'ar_timestamp'  => 'rev_timestamp',
2076                                 'ar_minor_edit' => 'rev_minor_edit',
2077                                 'ar_rev_id'     => 'rev_id',
2078                                 'ar_text_id'    => 'rev_text_id',
2079                         ), array(
2080                                 'page_id' => $id,
2081                                 'page_id = rev_page'
2082                         ), $fname
2083                 );
2084
2085                 # Now that it's safely backed up, delete it
2086                 $dbw->delete( 'revision', array( 'rev_page' => $id ), $fname );
2087                 $dbw->delete( 'page', array( 'page_id' => $id ), $fname);
2088
2089                 if ($wgUseTrackbacks)
2090                         $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), $fname );
2091
2092                 # Clean up recentchanges entries...
2093                 $dbw->delete( 'recentchanges', array( 'rc_namespace' => $ns, 'rc_title' => $t ), $fname );
2094
2095                 # Finally, clean up the link tables
2096                 $t = $this->mTitle->getPrefixedDBkey();
2097
2098                 Article::onArticleDelete( $this->mTitle );
2099
2100                 # Delete outgoing links
2101                 $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2102                 $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2103                 $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2104                 $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2105                 $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2106                 $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2107
2108                 # Log the deletion
2109                 $log = new LogPage( 'delete' );
2110                 $log->addEntry( 'delete', $this->mTitle, $reason );
2111
2112                 # Clear the cached article id so the interface doesn't act like we exist
2113                 $this->mTitle->resetArticleID( 0 );
2114                 $this->mTitle->mArticleID = 0;
2115                 return true;
2116         }
2117
2118         /**
2119          * Revert a modification
2120          */
2121         function rollback() {
2122                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2123                 $fname = 'Article::rollback';
2124
2125                 if( $wgUser->isAllowed( 'rollback' ) ) {
2126                         if( $wgUser->isBlocked() ) {
2127                                 $wgOut->blockedPage();
2128                                 return;
2129                         }
2130                 } else {
2131                         $wgOut->permissionRequired( 'rollback' );
2132                         return;
2133                 }
2134
2135                 if ( wfReadOnly() ) {
2136                         $wgOut->readOnlyPage( $this->getContent() );
2137                         return;
2138                 }
2139                 if( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ),
2140                         array( $this->mTitle->getPrefixedText(),
2141                                 $wgRequest->getVal( 'from' ) )  ) ) {
2142                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2143                         $wgOut->addWikiText( wfMsg( 'sessionfailure' ) );
2144                         return;
2145                 }
2146                 $dbw =& wfGetDB( DB_MASTER );
2147
2148                 # Enhanced rollback, marks edits rc_bot=1
2149                 $bot = $wgRequest->getBool( 'bot' );
2150
2151                 # Replace all this user's current edits with the next one down
2152                 $tt = $this->mTitle->getDBKey();
2153                 $n = $this->mTitle->getNamespace();
2154
2155                 # Get the last editor, lock table exclusively
2156                 $dbw->begin();
2157                 $current = Revision::newFromTitle( $this->mTitle );
2158                 if( is_null( $current ) ) {
2159                         # Something wrong... no page?
2160                         $dbw->rollback();
2161                         $wgOut->addHTML( wfMsg( 'notanarticle' ) );
2162                         return;
2163                 }
2164
2165                 $from = str_replace( '_', ' ', $wgRequest->getVal( 'from' ) );
2166                 if( $from != $current->getUserText() ) {
2167                         $wgOut->setPageTitle( wfMsg('rollbackfailed') );
2168                         $wgOut->addWikiText( wfMsg( 'alreadyrolled',
2169                                 htmlspecialchars( $this->mTitle->getPrefixedText()),
2170                                 htmlspecialchars( $from ),
2171                                 htmlspecialchars( $current->getUserText() ) ) );
2172                         if( $current->getComment() != '') {
2173                                 $wgOut->addHTML(
2174                                         wfMsg( 'editcomment',
2175                                         htmlspecialchars( $current->getComment() ) ) );
2176                         }
2177                         return;
2178                 }
2179
2180                 # Get the last edit not by this guy
2181                 $user = intval( $current->getUser() );
2182                 $user_text = $dbw->addQuotes( $current->getUserText() );
2183                 $s = $dbw->selectRow( 'revision',
2184                         array( 'rev_id', 'rev_timestamp' ),
2185                         array(
2186                                 'rev_page' => $current->getPage(),
2187                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
2188                         ), $fname,
2189                         array(
2190                                 'USE INDEX' => 'page_timestamp',
2191                                 'ORDER BY'  => 'rev_timestamp DESC' )
2192                         );
2193                 if( $s === false ) {
2194                         # Something wrong
2195                         $dbw->rollback();
2196                         $wgOut->setPageTitle(wfMsg('rollbackfailed'));
2197                         $wgOut->addHTML( wfMsg( 'cantrollback' ) );
2198                         return;
2199                 }
2200
2201                 $set = array();
2202                 if ( $bot ) {
2203                         # Mark all reverted edits as bot
2204                         $set['rc_bot'] = 1;
2205                 }
2206                 if ( $wgUseRCPatrol ) {
2207                         # Mark all reverted edits as patrolled
2208                         $set['rc_patrolled'] = 1;
2209                 }
2210
2211                 if ( $set ) {
2212                         $dbw->update( 'recentchanges', $set,
2213                                 array( /* WHERE */
2214                                         'rc_cur_id'    => $current->getPage(),
2215                                         'rc_user_text' => $current->getUserText(),
2216                                         "rc_timestamp > '{$s->rev_timestamp}'",
2217                                 ), $fname
2218                         );
2219                 }
2220
2221                 # Get the edit summary
2222                 $target = Revision::newFromId( $s->rev_id );
2223                 $newComment = wfMsgForContent( 'revertpage', $target->getUserText(), $from );
2224                 $newComment = $wgRequest->getText( 'summary', $newComment );
2225
2226                 # Save it!
2227                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2228                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2229                 $wgOut->addHTML( '<h2>' . htmlspecialchars( $newComment ) . "</h2>\n<hr />\n" );
2230
2231                 $this->updateArticle( $target->getText(), $newComment, 1, $this->mTitle->userIsWatching(), $bot );
2232                 Article::onArticleEdit( $this->mTitle );
2233
2234                 $dbw->commit();
2235                 $wgOut->returnToMain( false );
2236         }
2237
2238
2239         /**
2240          * Do standard deferred updates after page view
2241          * @private
2242          */
2243         function viewUpdates() {
2244                 global $wgDeferredUpdateList;
2245
2246                 if ( 0 != $this->getID() ) {
2247                         global $wgDisableCounters;
2248                         if( !$wgDisableCounters ) {
2249                                 Article::incViewCount( $this->getID() );
2250                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2251                                 array_push( $wgDeferredUpdateList, $u );
2252                         }
2253                 }
2254
2255                 # Update newtalk / watchlist notification status
2256                 global $wgUser;
2257                 $wgUser->clearNotification( $this->mTitle );
2258         }
2259
2260         /**
2261          * Do standard deferred updates after page edit.
2262          * Every 1000th edit, prune the recent changes table.
2263          * @private
2264          * @param string $text
2265          */
2266         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid) {
2267                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser;
2268
2269                 $fname = 'Article::editUpdates';
2270                 wfProfileIn( $fname );
2271
2272                 # Parse the text
2273                 $options = new ParserOptions;
2274                 $options->setTidy(true);
2275                 $poutput = $wgParser->parse( $text, $this->mTitle, $options, true, true, $newid );
2276
2277                 # Save it to the parser cache
2278                 $parserCache =& ParserCache::singleton();
2279                 $parserCache->save( $poutput, $this, $wgUser );
2280
2281                 # Update the links tables
2282                 $u = new LinksUpdate( $this->mTitle, $poutput );
2283                 $u->doUpdate();
2284
2285                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2286                         wfSeedRandom();
2287                         if ( 0 == mt_rand( 0, 999 ) ) {
2288                                 # Periodically flush old entries from the recentchanges table.
2289                                 global $wgRCMaxAge;
2290
2291                                 $dbw =& wfGetDB( DB_MASTER );
2292                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2293                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2294                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2295                                 $dbw->query( $sql );
2296                         }
2297                 }
2298
2299                 $id = $this->getID();
2300                 $title = $this->mTitle->getPrefixedDBkey();
2301                 $shortTitle = $this->mTitle->getDBkey();
2302
2303                 if ( 0 == $id ) {
2304                         wfProfileOut( $fname );
2305                         return;
2306                 }
2307
2308                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2309                 array_push( $wgDeferredUpdateList, $u );
2310                 $u = new SearchUpdate( $id, $title, $text );
2311                 array_push( $wgDeferredUpdateList, $u );
2312
2313                 # If this is another user's talk page, update newtalk
2314
2315                 if ($this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getName()) {
2316                         if (wfRunHooks('ArticleEditUpdateNewTalk', array(&$this)) ) {
2317                                 $other = User::newFromName( $shortTitle );
2318                                 if( is_null( $other ) && User::isIP( $shortTitle ) ) {
2319                                         // An anonymous user
2320                                         $other = new User();
2321                                         $other->setName( $shortTitle );
2322                                 }
2323                                 if( $other ) {
2324                                         $other->setNewtalk( true );
2325                                 }
2326                         }
2327                 }
2328
2329                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2330                         $wgMessageCache->replace( $shortTitle, $text );
2331                 }
2332
2333                 wfProfileOut( $fname );
2334         }
2335
2336         /**
2337          * Generate the navigation links when browsing through an article revisions
2338          * It shows the information as:
2339          *   Revision as of \<date\>; view current revision
2340          *   \<- Previous version | Next Version -\>
2341          *
2342          * @private
2343          * @param string $oldid         Revision ID of this article revision
2344          */
2345         function setOldSubtitle( $oldid=0 ) {
2346                 global $wgLang, $wgOut, $wgUser;
2347
2348                 $current = ( $oldid == $this->mLatest );
2349                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2350                 $sk = $wgUser->getSkin();
2351                 $lnk = $current
2352                         ? wfMsg( 'currentrevisionlink' )
2353                         : $lnk = $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2354                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2355                 $prevlink = $prev
2356                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2357                         : wfMsg( 'previousrevision' );
2358                 $nextlink = $current
2359                         ? wfMsg( 'nextrevision' )
2360                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2361                 $r = wfMsg( 'revisionasofwithlink', $td, $lnk, $prevlink, $nextlink );
2362                 $wgOut->setSubtitle( $r );
2363         }
2364
2365         /**
2366          * This function is called right before saving the wikitext,
2367          * so we can do things like signatures and links-in-context.
2368          *
2369          * @param string $text
2370          */
2371         function preSaveTransform( $text ) {
2372                 global $wgParser, $wgUser;
2373                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2374         }
2375
2376         /* Caching functions */
2377
2378         /**
2379          * checkLastModified returns true if it has taken care of all
2380          * output to the client that is necessary for this request.
2381          * (that is, it has sent a cached version of the page)
2382          */
2383         function tryFileCache() {
2384                 static $called = false;
2385                 if( $called ) {
2386                         wfDebug( " tryFileCache() -- called twice!?\n" );
2387                         return;
2388                 }
2389                 $called = true;
2390                 if($this->isFileCacheable()) {
2391                         $touched = $this->mTouched;
2392                         $cache = new CacheManager( $this->mTitle );
2393                         if($cache->isFileCacheGood( $touched )) {
2394                                 wfDebug( " tryFileCache() - about to load\n" );
2395                                 $cache->loadFromFileCache();
2396                                 return true;
2397                         } else {
2398                                 wfDebug( " tryFileCache() - starting buffer\n" );
2399                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2400                         }
2401                 } else {
2402                         wfDebug( " tryFileCache() - not cacheable\n" );
2403                 }
2404         }
2405
2406         /**
2407          * Check if the page can be cached
2408          * @return bool
2409          */
2410         function isFileCacheable() {
2411                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest;
2412                 extract( $wgRequest->getValues( 'action', 'oldid', 'diff', 'redirect', 'printable' ) );
2413
2414                 return $wgUseFileCache
2415                         and (!$wgShowIPinHeader)
2416                         and ($this->getID() != 0)
2417                         and ($wgUser->isAnon())
2418                         and (!$wgUser->getNewtalk())
2419                         and ($this->mTitle->getNamespace() != NS_SPECIAL )
2420                         and (empty( $action ) || $action == 'view')
2421                         and (!isset($oldid))
2422                         and (!isset($diff))
2423                         and (!isset($redirect))
2424                         and (!isset($printable))
2425                         and (!$this->mRedirectedFrom);
2426         }
2427
2428         /**
2429          * Loads page_touched and returns a value indicating if it should be used
2430          *
2431          */
2432         function checkTouched() {
2433                 $fname = 'Article::checkTouched';
2434                 if( !$this->mDataLoaded ) {
2435                         $this->loadPageData();
2436                 }
2437                 return !$this->mIsRedirect;
2438         }
2439
2440         /**
2441          * Get the page_touched field
2442          */
2443         function getTouched() {
2444                 # Ensure that page data has been loaded
2445                 if( !$this->mDataLoaded ) {
2446                         $this->loadPageData();
2447                 }
2448                 return $this->mTouched;
2449         }
2450
2451         /**
2452          * Get the page_latest field
2453          */
2454         function getLatest() {
2455                 if ( !$this->mDataLoaded ) {
2456                         $this->loadPageData();
2457                 }
2458                 return $this->mLatest;
2459         }
2460
2461         /**
2462          * Edit an article without doing all that other stuff
2463          * The article must already exist; link tables etc
2464          * are not updated, caches are not flushed.
2465          *
2466          * @param string $text text submitted
2467          * @param string $comment comment submitted
2468          * @param bool $minor whereas it's a minor modification
2469          */
2470         function quickEdit( $text, $comment = '', $minor = 0 ) {
2471                 $fname = 'Article::quickEdit';
2472                 wfProfileIn( $fname );
2473
2474                 $dbw =& wfGetDB( DB_MASTER );
2475                 $dbw->begin();
2476                 $revision = new Revision( array(
2477                         'page'       => $this->getId(),
2478                         'text'       => $text,
2479                         'comment'    => $comment,
2480                         'minor_edit' => $minor ? 1 : 0,
2481                         ) );
2482                 # fixme : $revisionId never used
2483                 $revisionId = $revision->insertOn( $dbw );
2484                 $this->updateRevisionOn( $dbw, $revision );
2485                 $dbw->commit();
2486
2487                 wfProfileOut( $fname );
2488         }
2489
2490         /**
2491          * Used to increment the view counter
2492          *
2493          * @static
2494          * @param integer $id article id
2495          */
2496         function incViewCount( $id ) {
2497                 $id = intval( $id );
2498                 global $wgHitcounterUpdateFreq, $wgDBtype;
2499
2500                 $dbw =& wfGetDB( DB_MASTER );
2501                 $pageTable = $dbw->tableName( 'page' );
2502                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
2503                 $acchitsTable = $dbw->tableName( 'acchits' );
2504
2505                 if( $wgHitcounterUpdateFreq <= 1 ){ //
2506                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
2507                         return;
2508                 }
2509
2510                 # Not important enough to warrant an error page in case of failure
2511                 $oldignore = $dbw->ignoreErrors( true );
2512
2513                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
2514
2515                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
2516                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
2517                         # Most of the time (or on SQL errors), skip row count check
2518                         $dbw->ignoreErrors( $oldignore );
2519                         return;
2520                 }
2521
2522                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
2523                 $row = $dbw->fetchObject( $res );
2524                 $rown = intval( $row->n );
2525                 if( $rown >= $wgHitcounterUpdateFreq ){
2526                         wfProfileIn( 'Article::incViewCount-collect' );
2527                         $old_user_abort = ignore_user_abort( true );
2528
2529                         if ($wgDBtype == 'mysql')
2530                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
2531                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
2532                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype".
2533                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
2534                                 'GROUP BY hc_id');
2535                         $dbw->query("DELETE FROM $hitcounterTable");
2536                         if ($wgDBtype == 'mysql')
2537                                 $dbw->query('UNLOCK TABLES');
2538                         $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
2539                                 'WHERE page_id = hc_id');
2540                         $dbw->query("DROP TABLE $acchitsTable");
2541
2542                         ignore_user_abort( $old_user_abort );
2543                         wfProfileOut( 'Article::incViewCount-collect' );
2544                 }
2545                 $dbw->ignoreErrors( $oldignore );
2546         }
2547
2548         /**#@+
2549          * The onArticle*() functions are supposed to be a kind of hooks
2550          * which should be called whenever any of the specified actions
2551          * are done.
2552          *
2553          * This is a good place to put code to clear caches, for instance.
2554          *
2555          * This is called on page move and undelete, as well as edit
2556          * @static
2557          * @param $title_obj a title object
2558          */
2559
2560         function onArticleCreate($title_obj) {
2561                 global $wgUseSquid, $wgPostCommitUpdateList;
2562
2563                 $title_obj->touchLinks();
2564                 $titles = $title_obj->getLinksTo();
2565
2566                 # Purge squid
2567                 if ( $wgUseSquid ) {
2568                         $urls = $title_obj->getSquidURLs();
2569                         foreach ( $titles as $linkTitle ) {
2570                                 $urls[] = $linkTitle->getInternalURL();
2571                         }
2572                         $u = new SquidUpdate( $urls );
2573                         array_push( $wgPostCommitUpdateList, $u );
2574                 }
2575         }
2576
2577         function onArticleDelete( $title ) {
2578                 global $wgMessageCache;
2579
2580                 $title->touchLinks();
2581
2582                 if( $title->getNamespace() == NS_MEDIAWIKI) {
2583                         $wgMessageCache->replace( $title->getDBkey(), false );
2584                 }
2585         }
2586
2587         /**
2588          * Purge caches on page update etc
2589          */
2590         function onArticleEdit( $title ) {
2591                 global $wgUseSquid, $wgPostCommitUpdateList, $wgUseFileCache;
2592
2593                 $urls = array();
2594
2595                 // Template namespace? Purge all articles linking here.
2596                 // FIXME: When a templatelinks table arrives, use it for all includes.
2597                 if ( $title->getNamespace() == NS_TEMPLATE) {
2598                         $titles = $title->getLinksTo();
2599                         Title::touchArray( $titles );
2600                         if ( $wgUseSquid ) {
2601                                 foreach ( $titles as $link ) {
2602                                         $urls[] = $link->getInternalURL();
2603                                 }
2604                         }
2605                 }
2606
2607                 # Squid updates
2608                 if ( $wgUseSquid ) {
2609                         $urls = array_merge( $urls, $title->getSquidURLs() );
2610                         $u = new SquidUpdate( $urls );
2611                         array_push( $wgPostCommitUpdateList, $u );
2612                 }
2613
2614                 # File cache
2615                 if ( $wgUseFileCache ) {
2616                         $cm = new CacheManager( $title );
2617                         @unlink( $cm->fileCacheName() );
2618                 }
2619         }
2620
2621         /**#@-*/
2622
2623         /**
2624          * Info about this page
2625          * Called for ?action=info when $wgAllowPageInfo is on.
2626          *
2627          * @public
2628          */
2629         function info() {
2630                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
2631                 $fname = 'Article::info';
2632
2633                 if ( !$wgAllowPageInfo ) {
2634                         $wgOut->errorpage( 'nosuchaction', 'nosuchactiontext' );
2635                         return;
2636                 }
2637
2638                 $page = $this->mTitle->getSubjectPage();
2639
2640                 $wgOut->setPagetitle( $page->getPrefixedText() );
2641                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ));
2642
2643                 # first, see if the page exists at all.
2644                 $exists = $page->getArticleId() != 0;
2645                 if( !$exists ) {
2646                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2647                                 $wgOut->addHTML(wfMsgWeirdKey ( $this->mTitle->getText() ) );
2648                         } else {
2649                                 $wgOut->addHTML(wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' ) );
2650                         }
2651                 } else {
2652                         $dbr =& wfGetDB( DB_SLAVE );
2653                         $wl_clause = array(
2654                                 'wl_title'     => $page->getDBkey(),
2655                                 'wl_namespace' => $page->getNamespace() );
2656                         $numwatchers = $dbr->selectField(
2657                                 'watchlist',
2658                                 'COUNT(*)',
2659                                 $wl_clause,
2660                                 $fname,
2661                                 $this->getSelectOptions() );
2662
2663                         $pageInfo = $this->pageCountInfo( $page );
2664                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
2665
2666                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
2667                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
2668                         if( $talkInfo ) {
2669                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
2670                         }
2671                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
2672                         if( $talkInfo ) {
2673                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
2674                         }
2675                         $wgOut->addHTML( '</ul>' );
2676
2677                 }
2678         }
2679
2680         /**
2681          * Return the total number of edits and number of unique editors
2682          * on a given page. If page does not exist, returns false.
2683          *
2684          * @param Title $title
2685          * @return array
2686          * @private
2687          */
2688         function pageCountInfo( $title ) {
2689                 $id = $title->getArticleId();
2690                 if( $id == 0 ) {
2691                         return false;
2692                 }
2693
2694                 $dbr =& wfGetDB( DB_SLAVE );
2695
2696                 $rev_clause = array( 'rev_page' => $id );
2697                 $fname = 'Article::pageCountInfo';
2698
2699                 $edits = $dbr->selectField(
2700                         'revision',
2701                         'COUNT(rev_page)',
2702                         $rev_clause,
2703                         $fname,
2704                         $this->getSelectOptions() );
2705
2706                 $authors = $dbr->selectField(
2707                         'revision',
2708                         'COUNT(DISTINCT rev_user_text)',
2709                         $rev_clause,
2710                         $fname,
2711                         $this->getSelectOptions() );
2712
2713                 return array( 'edits' => $edits, 'authors' => $authors );
2714         }
2715
2716         /**
2717          * Return a list of templates used by this article.
2718          * Uses the templatelinks table
2719          *
2720          * @return array Array of Title objects
2721          */
2722         function getUsedTemplates() {
2723                 $result = array();
2724                 $id = $this->mTitle->getArticleID();
2725                 if( $id == 0 ) {
2726                         return array();
2727                 }
2728
2729                 $dbr =& wfGetDB( DB_SLAVE );
2730                 $res = $dbr->select( array( 'templatelinks' ),
2731                         array( 'tl_namespace', 'tl_title' ),
2732                         array( 'tl_from' => $id ),
2733                         'Article:getUsedTemplates' );
2734                 if ( false !== $res ) {
2735                         if ( $dbr->numRows( $res ) ) {
2736                                 while ( $row = $dbr->fetchObject( $res ) ) {
2737                                         $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2738                                 }
2739                         }
2740                 }
2741                 $dbr->freeResult( $res );
2742                 return $result;
2743         }
2744 }
2745
2746 ?>