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                         $lastid = $oldid;
 341                 }
 342                 if ( !$oldid ) {
 343                         $oldid = 0;
 344                 }
 345                 return $oldid;
 346         }
 347
 348         /**
 349          * Load the revision (including text) into this object
 350          */
 351         function loadContent() {
 352                 if ( $this->mContentLoaded ) return;
 353
 354                 # Query variables :P
 355                 $oldid = $this->getOldID();
 356
 357                 $fname = 'Article::loadContent';
 358
 359                 # Pre-fill content with error message so that if something
 360                 # fails we'll have something telling us what we intended.
 361
 362                 $t = $this->mTitle->getPrefixedText();
 363
 364                 $this->mOldId = $oldid;
 365                 $this->fetchContent( $oldid );
 366         }
 367
 368
 369         /**
 370          * Fetch a page record with the given conditions
 371          * @param Database $dbr
 372          * @param array    $conditions
 373          * @private
 374          */
 375         function pageData( &$dbr, $conditions ) {
 376                 $fields = array(
 377                                 'page_id',
 378                                 'page_namespace',
 379                                 'page_title',
 380                                 'page_restrictions',
 381                                 'page_counter',
 382                                 'page_is_redirect',
 383                                 'page_is_new',
 384                                 'page_random',
 385                                 'page_touched',
 386                                 'page_latest',
 387                                 'page_len' ) ;
 388                 wfRunHooks( 'ArticlePageDataBefore', array( &$this , &$fields ) )       ;
 389                 $row = $dbr->selectRow( 'page',
 390                         $fields,
 391                         $conditions,
 392                         'Article::pageData' );
 393                 wfRunHooks( 'ArticlePageDataAfter', array( &$this , &$row ) )   ;
 394                 return $row ;
 395         }
 396
 397         /**
 398          * @param Database $dbr
 399          * @param Title $title
 400          */
 401         function pageDataFromTitle( &$dbr, $title ) {
 402                 return $this->pageData( $dbr, array(
 403                         'page_namespace' => $title->getNamespace(),
 404                         'page_title'     => $title->getDBkey() ) );
 405         }
 406
 407         /**
 408          * @param Database $dbr
 409          * @param int $id
 410          */
 411         function pageDataFromId( &$dbr, $id ) {
 412                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 413         }
 414
 415         /**
 416          * Set the general counter, title etc data loaded from
 417          * some source.
 418          *
 419          * @param object $data
 420          * @private
 421          */
 422         function loadPageData( $data = 'fromdb' ) {
 423                 if ( $data === 'fromdb' ) {
 424                         $dbr =& $this->getDB();
 425                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 426                 }
 427
 428                 $lc =& LinkCache::singleton();
 429                 if ( $data ) {
 430                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle );
 431
 432                         $this->mTitle->mArticleID = $data->page_id;
 433                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 434                         $this->mTitle->mRestrictionsLoaded = true;
 435
 436                         $this->mCounter     = $data->page_counter;
 437                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 438                         $this->mIsRedirect  = $data->page_is_redirect;
 439                         $this->mLatest      = $data->page_latest;
 440                 } else {
 441                         if ( is_object( $this->mTitle ) ) {
 442                                 $lc->addBadLinkObj( $this->mTitle );
 443                         }
 444                         $this->mTitle->mArticleID = 0;
 445                 }
 446
 447                 $this->mDataLoaded  = true;
 448         }
 449
 450         /**
 451          * Get text of an article from database
 452          * Does *NOT* follow redirects.
 453          * @param int $oldid 0 for whatever the latest revision is
 454          * @return string
 455          */
 456         function fetchContent( $oldid = 0 ) {
 457                 if ( $this->mContentLoaded ) {
 458                         return $this->mContent;
 459                 }
 460
 461                 $dbr =& $this->getDB();
 462                 $fname = 'Article::fetchContent';
 463
 464                 # Pre-fill content with error message so that if something
 465                 # fails we'll have something telling us what we intended.
 466                 $t = $this->mTitle->getPrefixedText();
 467                 if( $oldid ) {
 468                         $t .= ',oldid='.$oldid;
 469                 }
 470                 $this->mContent = wfMsg( 'missingarticle', $t ) ;
 471
 472                 if( $oldid ) {
 473                         $revision = Revision::newFromId( $oldid );
 474                         if( is_null( $revision ) ) {
 475                                 wfDebug( "$fname failed to retrieve specified revision, id $oldid\n" );
 476                                 return false;
 477                         }
 478                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 479                         if( !$data ) {
 480                                 wfDebug( "$fname failed to get page data linked to revision id $oldid\n" );
 481                                 return false;
 482                         }
 483                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 484                         $this->loadPageData( $data );
 485                 } else {
 486                         if( !$this->mDataLoaded ) {
 487                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 488                                 if( !$data ) {
 489                                         wfDebug( "$fname failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 490                                         return false;
 491                                 }
 492                                 $this->loadPageData( $data );
 493                         }
 494                         $revision = Revision::newFromId( $this->mLatest );
 495                         if( is_null( $revision ) ) {
 496                                 wfDebug( "$fname failed to retrieve current page, rev_id {$data->page_latest}\n" );
 497                                 return false;
 498                         }
 499                 }
 500
 501                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 502                 // We should instead work with the Revision object when we need it...
 503                 $this->mContent = $revision->userCan( MW_REV_DELETED_TEXT ) ? $revision->getRawText() : "";
 504                 //$this->mContent   = $revision->getText();
 505
 506                 $this->mUser      = $revision->getUser();
 507                 $this->mUserText  = $revision->getUserText();
 508                 $this->mComment   = $revision->getComment();
 509                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 510
 511                 $this->mRevIdFetched = $revision->getID();
 512                 $this->mContentLoaded = true;
 513                 $this->mRevision =& $revision;
 514
 515                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 516
 517                 return $this->mContent;
 518         }
 519
 520         /**
 521          * Read/write accessor to select FOR UPDATE
 522          *
 523          * @param $x Mixed: FIXME
 524          */
 525         function forUpdate( $x = NULL ) {
 526                 return wfSetVar( $this->mForUpdate, $x );
 527         }
 528
 529         /**
 530          * Get the database which should be used for reads
 531          *
 532          * @return Database
 533          */
 534         function &getDB() {
 535                 $ret =& wfGetDB( DB_MASTER );
 536                 return $ret;
 537         }
 538
 539         /**
 540          * Get options for all SELECT statements
 541          *
 542          * @param $options Array: an optional options array which'll be appended to
 543          *                       the default
 544          * @return Array: options
 545          */
 546         function getSelectOptions( $options = '' ) {
 547                 if ( $this->mForUpdate ) {
 548                         if ( is_array( $options ) ) {
 549                                 $options[] = 'FOR UPDATE';
 550                         } else {
 551                                 $options = 'FOR UPDATE';
 552                         }
 553                 }
 554                 return $options;
 555         }
 556
 557         /**
 558          * @return int Page ID
 559          */
 560         function getID() {
 561                 if( $this->mTitle ) {
 562                         return $this->mTitle->getArticleID();
 563                 } else {
 564                         return 0;
 565                 }
 566         }
 567
 568         /**
 569          * @return bool Whether or not the page exists in the database
 570          */
 571         function exists() {
 572                 return $this->getId() != 0;
 573         }
 574
 575         /**
 576          * @return int The view count for the page
 577          */
 578         function getCount() {
 579                 if ( -1 == $this->mCounter ) {
 580                         $id = $this->getID();
 581                         if ( $id == 0 ) {
 582                                 $this->mCounter = 0;
 583                         } else {
 584                                 $dbr =& wfGetDB( DB_SLAVE );
 585                                 $this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
 586                                         'Article::getCount', $this->getSelectOptions() );
 587                         }
 588                 }
 589                 return $this->mCounter;
 590         }
 591
 592         /**
 593          * Determine whether a page  would be suitable for being counted as an
 594          * article in the site_stats table based on the title & its content
 595          *
 596          * @param $text String: text to analyze
 597          * @return bool
 598          */
 599         function isCountable( $text ) {
 600                 global $wgUseCommaCount;
 601
 602                 $token = $wgUseCommaCount ? ',' : '[[';
 603                 return
 604                         $this->mTitle->getNamespace() == NS_MAIN
 605                         && ! $this->isRedirect( $text )
 606                         && in_string( $token, $text );
 607         }
 608
 609         /**
 610          * Tests if the article text represents a redirect
 611          *
 612          * @param $text String: FIXME
 613          * @return bool
 614          */
 615         function isRedirect( $text = false ) {
 616                 if ( $text === false ) {
 617                         $this->loadContent();
 618                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 619                 } else {
 620                         $titleObj = Title::newFromRedirect( $text );
 621                 }
 622                 return $titleObj !== NULL;
 623         }
 624
 625         /**
 626          * Returns true if the currently-referenced revision is the current edit
 627          * to this page (and it exists).
 628          * @return bool
 629          */
 630         function isCurrent() {
 631                 return $this->exists() &&
 632                         isset( $this->mRevision ) &&
 633                         $this->mRevision->isCurrent();
 634         }
 635
 636         /**
 637          * Loads everything except the text
 638          * This isn't necessary for all uses, so it's only done if needed.
 639          * @private
 640          */
 641         function loadLastEdit() {
 642                 if ( -1 != $this->mUser )
 643                         return;
 644
 645                 # New or non-existent articles have no user information
 646                 $id = $this->getID();
 647                 if ( 0 == $id ) return;
 648
 649                 $this->mLastRevision = Revision::loadFromPageId( $this->getDB(), $id );
 650                 if( !is_null( $this->mLastRevision ) ) {
 651                         $this->mUser      = $this->mLastRevision->getUser();
 652                         $this->mUserText  = $this->mLastRevision->getUserText();
 653                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 654                         $this->mComment   = $this->mLastRevision->getComment();
 655                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 656                         $this->mRevIdFetched = $this->mLastRevision->getID();
 657                 }
 658         }
 659
 660         function getTimestamp() {
 661                 // Check if the field has been filled by ParserCache::get()
 662                 if ( !$this->mTimestamp ) {
 663                         $this->loadLastEdit();
 664                 }
 665                 return wfTimestamp(TS_MW, $this->mTimestamp);
 666         }
 667
 668         function getUser() {
 669                 $this->loadLastEdit();
 670                 return $this->mUser;
 671         }
 672
 673         function getUserText() {
 674                 $this->loadLastEdit();
 675                 return $this->mUserText;
 676         }
 677
 678         function getComment() {
 679                 $this->loadLastEdit();
 680                 return $this->mComment;
 681         }
 682
 683         function getMinorEdit() {
 684                 $this->loadLastEdit();
 685                 return $this->mMinorEdit;
 686         }
 687
 688         function getRevIdFetched() {
 689                 $this->loadLastEdit();
 690                 return $this->mRevIdFetched;
 691         }
 692
 693         /**
 694          * @todo Document
 695          * @param $limit Integer: default 0.
 696          * @param $offset Integer: default 0.
 697          */
 698         function getContributors($limit = 0, $offset = 0) {
 699                 $fname = 'Article::getContributors';
 700
 701                 # XXX: this is expensive; cache this info somewhere.
 702
 703                 $title = $this->mTitle;
 704                 $contribs = array();
 705                 $dbr =& wfGetDB( DB_SLAVE );
 706                 $revTable = $dbr->tableName( 'revision' );
 707                 $userTable = $dbr->tableName( 'user' );
 708                 $encDBkey = $dbr->addQuotes( $title->getDBkey() );
 709                 $ns = $title->getNamespace();
 710                 $user = $this->getUser();
 711                 $pageId = $this->getId();
 712
 713                 $sql = "SELECT rev_user, rev_user_text, user_real_name, MAX(rev_timestamp) as timestamp
 714                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 715                         WHERE rev_page = $pageId
 716                         AND rev_user != $user
 717                         GROUP BY rev_user, rev_user_text, user_real_name
 718                         ORDER BY timestamp DESC";
 719
 720                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 721                 $sql .= ' '. $this->getSelectOptions();
 722
 723                 $res = $dbr->query($sql, $fname);
 724
 725                 while ( $line = $dbr->fetchObject( $res ) ) {
 726                         $contribs[] = array($line->rev_user, $line->rev_user_text, $line->user_real_name);
 727                 }
 728
 729                 $dbr->freeResult($res);
 730                 return $contribs;
 731         }
 732
 733         /**
 734          * This is the default action of the script: just view the page of
 735          * the given title.
 736         */
 737         function view() {
 738                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 739                 global $wgEnableParserCache, $wgStylePath, $wgUseRCPatrol, $wgParser;
 740                 global $wgUseTrackbacks;
 741                 $sk = $wgUser->getSkin();
 742
 743                 $fname = 'Article::view';
 744                 wfProfileIn( $fname );
 745                 $parserCache =& ParserCache::singleton();
 746                 # Get variables from query string
 747                 $oldid = $this->getOldID();
 748
 749                 # getOldID may want us to redirect somewhere else
 750                 if ( $this->mRedirectUrl ) {
 751                         $wgOut->redirect( $this->mRedirectUrl );
 752                         wfProfileOut( $fname );
 753                         return;
 754                 }
 755
 756                 $diff = $wgRequest->getVal( 'diff' );
 757                 $rcid = $wgRequest->getVal( 'rcid' );
 758                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 759
 760                 $wgOut->setArticleFlag( true );
 761                 $wgOut->setRobotpolicy( 'index,follow' );
 762                 # If we got diff and oldid in the query, we want to see a
 763                 # diff page instead of the article.
 764
 765                 if ( !is_null( $diff ) ) {
 766                         require_once( 'DifferenceEngine.php' );
 767                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 768
 769                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid );
 770                         // DifferenceEngine directly fetched the revision:
 771                         $this->mRevIdFetched = $de->mNewid;
 772                         $de->showDiffPage();
 773
 774                         if( $diff == 0 ) {
 775                                 # Run view updates for current revision only
 776                                 $this->viewUpdates();
 777                         }
 778                         wfProfileOut( $fname );
 779                         return;
 780                 }
 781
 782                 if ( empty( $oldid ) && $this->checkTouched() ) {
 783                         $wgOut->setETag($parserCache->getETag($this, $wgUser));
 784
 785                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 786                                 wfProfileOut( $fname );
 787                                 return;
 788                         } else if ( $this->tryFileCache() ) {
 789                                 # tell wgOut that output is taken care of
 790                                 $wgOut->disable();
 791                                 $this->viewUpdates();
 792                                 wfProfileOut( $fname );
 793                                 return;
 794                         }
 795                 }
 796                 # Should the parser cache be used?
 797                 $pcache = $wgEnableParserCache &&
 798                         intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
 799                         $this->exists() &&
 800                         empty( $oldid );
 801                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 802                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 803                         wfIncrStats( 'pcache_miss_stub' );
 804                 }
 805
 806                 $wasRedirected = false;
 807                 if ( isset( $this->mRedirectedFrom ) ) {
 808                         // This is an internally redirected page view.
 809                         // We'll need a backlink to the source page for navigation.
 810                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 811                                 $sk = $wgUser->getSkin();
 812                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 813                                 $s = wfMsg( 'redirectedfrom', $redir );
 814                                 $wgOut->setSubtitle( $s );
 815                                 $wasRedirected = true;
 816                         }
 817                 } elseif ( !empty( $rdfrom ) ) {
 818                         // This is an externally redirected view, from some other wiki.
 819                         // If it was reported from a trusted site, supply a backlink.
 820                         global $wgRedirectSources;
 821                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 822                                 $sk = $wgUser->getSkin();
 823                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 824                                 $s = wfMsg( 'redirectedfrom', $redir );
 825                                 $wgOut->setSubtitle( $s );
 826                                 $wasRedirected = true;
 827                         }
 828                 }
 829
 830                 $outputDone = false;
 831                 if ( $pcache ) {
 832                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 833                                 $outputDone = true;
 834                         }
 835                 }
 836                 if ( !$outputDone ) {
 837                         $text = $this->getContent();
 838                         if ( $text === false ) {
 839                                 # Failed to load, replace text with error message
 840                                 $t = $this->mTitle->getPrefixedText();
 841                                 if( $oldid ) {
 842                                         $t .= ',oldid='.$oldid;
 843                                         $text = wfMsg( 'missingarticle', $t );
 844                                 } else {
 845                                         $text = wfMsg( 'noarticletext', $t );
 846                                 }
 847                         }
 848
 849                         # Another whitelist check in case oldid is altering the title
 850                         if ( !$this->mTitle->userCanRead() ) {
 851                                 $wgOut->loginToUse();
 852                                 $wgOut->output();
 853                                 exit;
 854                         }
 855
 856                         # We're looking at an old revision
 857
 858                         if ( !empty( $oldid ) ) {
 859                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 860                                 if( is_null( $this->mRevision ) ) {
 861                                         // FIXME: This would be a nice place to load the 'no such page' text.
 862                                 } else {
 863                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 864                                         if( $this->mRevision->isDeleted( MW_REV_DELETED_TEXT ) ) {
 865                                                 if( !$this->mRevision->userCan( MW_REV_DELETED_TEXT ) ) {
 866                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-permission' ) );
 867                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 868                                                         return;
 869                                                 } else {
 870                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-view' ) );
 871                                                         // and we are allowed to see...
 872                                                 }
 873                                         }
 874                                 }
 875
 876                         }
 877                 }
 878                 if( !$outputDone ) {
 879                         /**
 880                          * @fixme: this hook doesn't work most of the time, as it doesn't
 881                          * trigger when the parser cache is used.
 882                          */
 883                         wfRunHooks( 'ArticleViewHeader', array( &$this ) ) ;
 884                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 885                         # wrap user css and user js in pre and don't parse
 886                         # XXX: use $this->mTitle->usCssJsSubpage() when php is fixed/ a workaround is found
 887                         if (
 888                                 $this->mTitle->getNamespace() == NS_USER &&
 889                                 preg_match('/\\/[\\w]+\\.(css|js)$/', $this->mTitle->getDBkey())
 890                         ) {
 891                                 $wgOut->addWikiText( wfMsg('clearyourcache'));
 892                                 $wgOut->addHTML( '<pre>'.htmlspecialchars($this->mContent)."\n</pre>" );
 893                         } else if ( $rt = Title::newFromRedirect( $text ) ) {
 894                                 # Display redirect
 895                                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 896                                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 897                                 if( !$wasRedirected ) {
 898                                         $wgOut->setSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 899                                 }
 900                                 $targetUrl = $rt->escapeLocalURL();
 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->isSysop()) {
 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( $fname );
1273         }
1274
1275         function getTextOfLastEditWithSectionReplacedOrAdded($section, $text, $summary = '', $edittime = NULL) {
1276                 $this->replaceSection( $section, $text, $summary, $edittime );
1277         }
1278
1279         /**
1280          * @return string Complete article text, or null if error
1281          */
1282         function replaceSection($section, $text, $summary = '', $edittime = NULL) {
1283                 $fname = 'Article::replaceSection';
1284                 wfProfileIn( $fname );
1285
1286                 if ($section != '') {
1287                         if( is_null( $edittime ) ) {
1288                                 $rev = Revision::newFromTitle( $this->mTitle );
1289                         } else {
1290                                 $dbw =& wfGetDB( DB_MASTER );
1291                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1292                         }
1293                         if( is_null( $rev ) ) {
1294                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1295                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1296                                 return null;
1297                         }
1298                         $oldtext = $rev->getText();
1299
1300                         if($section=='new') {
1301                                 if($summary) $subject="== {$summary} ==\n\n";
1302                                 $text=$oldtext."\n\n".$subject.$text;
1303                         } else {
1304
1305                                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
1306                                 # comments to be stripped as well)
1307                                 $striparray=array();
1308                                 $parser=new Parser();
1309                                 $parser->mOutputType=OT_WIKI;
1310                                 $parser->mOptions = new ParserOptions();
1311                                 $oldtext=$parser->strip($oldtext, $striparray, true);
1312
1313                                 # now that we can be sure that no pseudo-sections are in the source,
1314                                 # split it up
1315                                 # Unfortunately we can't simply do a preg_replace because that might
1316                                 # replace the wrong section, so we have to use the section counter instead
1317                                 $secs=preg_split('/(^=+.+?=+|^<h[1-6].*?>.*?<\/h[1-6].*?>)(?!\S)/mi',
1318                                   $oldtext,-1,PREG_SPLIT_DELIM_CAPTURE);
1319                                 $secs[$section*2]=$text."\n\n"; // replace with edited
1320
1321                                 # section 0 is top (intro) section
1322                                 if($section!=0) {
1323
1324                                         # headline of old section - we need to go through this section
1325                                         # to determine if there are any subsections that now need to
1326                                         # be erased, as the mother section has been replaced with
1327                                         # the text of all subsections.
1328                                         $headline=$secs[$section*2-1];
1329                                         preg_match( '/^(=+).+?=+|^<h([1-6]).*?>.*?<\/h[1-6].*?>(?!\S)/mi',$headline,$matches);
1330                                         $hlevel=$matches[1];
1331
1332                                         # determine headline level for wikimarkup headings
1333                                         if(strpos($hlevel,'=')!==false) {
1334                                                 $hlevel=strlen($hlevel);
1335                                         }
1336
1337                                         $secs[$section*2-1]=''; // erase old headline
1338                                         $count=$section+1;
1339                                         $break=false;
1340                                         while(!empty($secs[$count*2-1]) && !$break) {
1341
1342                                                 $subheadline=$secs[$count*2-1];
1343                                                 preg_match(
1344                                                  '/^(=+).+?=+|^<h([1-6]).*?>.*?<\/h[1-6].*?>(?!\S)/mi',$subheadline,$matches);
1345                                                 $subhlevel=$matches[1];
1346                                                 if(strpos($subhlevel,'=')!==false) {
1347                                                         $subhlevel=strlen($subhlevel);
1348                                                 }
1349                                                 if($subhlevel > $hlevel) {
1350                                                         // erase old subsections
1351                                                         $secs[$count*2-1]='';
1352                                                         $secs[$count*2]='';
1353                                                 }
1354                                                 if($subhlevel <= $hlevel) {
1355                                                         $break=true;
1356                                                 }
1357                                                 $count++;
1358
1359                                         }
1360
1361                                 }
1362                                 $text=join('',$secs);
1363                                 # reinsert the stuff that we stripped out earlier
1364                                 $text=$parser->unstrip($text,$striparray);
1365                                 $text=$parser->unstripNoWiki($text,$striparray);
1366                         }
1367
1368                 }
1369                 wfProfileOut( $fname );
1370                 return $text;
1371         }
1372
1373         /**
1374          * Change an existing article. Puts the previous version back into the old table, updates RC
1375          * and all necessary caches, mostly via the deferred update array.
1376          *
1377          * It is possible to call this function from a command-line script, but note that you should
1378          * first set $wgUser, and clean up $wgDeferredUpdates after each edit.
1379          */
1380         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1381                 global $wgUser, $wgDBtransactions, $wgUseSquid;
1382                 global $wgPostCommitUpdateList, $wgUseFileCache;
1383
1384                 $fname = 'Article::updateArticle';
1385                 wfProfileIn( $fname );
1386                 $good = true;
1387
1388                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1389                         &$summary, &$minor,
1390                         &$watchthis, &$sectionanchor ) ) ) {
1391                         wfDebug( "$fname: ArticleSave hook aborted save!\n" );
1392                         wfProfileOut( $fname );
1393                         return false;
1394                 }
1395
1396                 $isminor = $minor && $wgUser->isAllowed('minoredit');
1397                 $redir = (int)$this->isRedirect( $text );
1398
1399                 $text = $this->preSaveTransform( $text );
1400                 $dbw =& wfGetDB( DB_MASTER );
1401                 $now = wfTimestampNow();
1402
1403                 # Update article, but only if changed.
1404
1405                 # It's important that we either rollback or complete, otherwise an attacker could
1406                 # overwrite cur entries by sending precisely timed user aborts. Random bored users
1407                 # could conceivably have the same effect, especially if cur is locked for long periods.
1408                 if( !$wgDBtransactions ) {
1409                         $userAbort = ignore_user_abort( true );
1410                 }
1411
1412                 $oldtext = $this->getContent();
1413                 $oldsize = strlen( $oldtext );
1414                 $newsize = strlen( $text );
1415                 $lastRevision = 0;
1416                 $revisionId = 0;
1417
1418                 if ( 0 != strcmp( $text, $oldtext ) ) {
1419                         $this->mGoodAdjustment = (int)$this->isCountable( $text )
1420                           - (int)$this->isCountable( $oldtext );
1421                         $this->mTotalAdjustment = 0;
1422                         $now = wfTimestampNow();
1423
1424                         $lastRevision = $dbw->selectField(
1425                                 'page', 'page_latest', array( 'page_id' => $this->getId() ) );
1426
1427                         $revision = new Revision( array(
1428                                 'page'       => $this->getId(),
1429                                 'comment'    => $summary,
1430                                 'minor_edit' => $isminor,
1431                                 'text'       => $text
1432                                 ) );
1433
1434                         $dbw->immediateCommit();
1435                         $dbw->begin();
1436                         $revisionId = $revision->insertOn( $dbw );
1437
1438                         # Update page
1439                         $ok = $this->updateRevisionOn( $dbw, $revision, $lastRevision );
1440
1441                         if( !$ok ) {
1442                                 /* Belated edit conflict! Run away!! */
1443                                 $good = false;
1444                                 $dbw->rollback();
1445                         } else {
1446                                 # Update recentchanges and purge cache and whatnot
1447                                 require_once( 'RecentChange.php' );
1448                                 $bot = (int)($wgUser->isBot() || $forceBot);
1449                                 $rcid = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $wgUser, $summary,
1450                                         $lastRevision, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1451                                         $revisionId );
1452
1453                                 # Mark as patrolled if the user can do so and has it set in their options
1454                                 if( $wgUser->isAllowed( 'patrol' ) && $wgUser->getOption( 'autopatrol' ) ) {
1455                                         RecentChange::markPatrolled( $rcid );
1456                                 }
1457
1458                                 $dbw->commit();
1459
1460                                 // Update caches outside the main transaction
1461                                 Article::onArticleEdit( $this->mTitle );
1462                         }
1463                 } else {
1464                         // Keep the same revision ID, but do some updates on it
1465                         $revisionId = $this->getRevIdFetched();
1466                 }
1467
1468                 if( !$wgDBtransactions ) {
1469                         ignore_user_abort( $userAbort );
1470                 }
1471
1472                 if ( $good ) {
1473                         if ($watchthis) {
1474                                 if (!$this->mTitle->userIsWatching()) {
1475                                         $dbw->immediateCommit();
1476                                         $dbw->begin();
1477                                         $this->doWatch();
1478                                         $dbw->commit();
1479                                 }
1480                         } else {
1481                                 if ( $this->mTitle->userIsWatching() ) {
1482                                         $dbw->immediateCommit();
1483                                         $dbw->begin();
1484                                         $this->doUnwatch();
1485                                         $dbw->commit();
1486                                 }
1487                         }
1488                         # standard deferred updates
1489                         $this->editUpdates( $text, $summary, $minor, $now, $revisionId );
1490
1491
1492                         $urls = array();
1493                         # Invalidate caches of all articles using this article as a template
1494
1495                         # Template namespace
1496                         # Purge all articles linking here
1497                         $titles = $this->mTitle->getTemplateLinksTo();
1498                         Title::touchArray( $titles );
1499                         if ( $wgUseSquid ) {
1500                                         foreach ( $titles as $title ) {
1501                                                 $urls[] = $title->getInternalURL();
1502                                         }
1503                         }
1504
1505                         # Squid updates
1506                         if ( $wgUseSquid ) {
1507                                 $urls = array_merge( $urls, $this->mTitle->getSquidURLs() );
1508                                 $u = new SquidUpdate( $urls );
1509                                 array_push( $wgPostCommitUpdateList, $u );
1510                         }
1511
1512                         # File cache
1513                         if ( $wgUseFileCache ) {
1514                                 $cm = new CacheManager($this->mTitle);
1515                                 @unlink($cm->fileCacheName());
1516                         }
1517
1518                         $this->showArticle( $text, wfMsg( 'updated' ), $sectionanchor, $isminor, $now, $summary, $lastRevision );
1519                 }
1520                 wfRunHooks( 'ArticleSaveComplete',
1521                         array( &$this, &$wgUser, $text,
1522                         $summary, $minor,
1523                         $watchthis, $sectionanchor ) );
1524                 wfProfileOut( $fname );
1525                 return $good;
1526         }
1527
1528         /**
1529          * After we've either updated or inserted the article, update
1530          * the link tables and redirect to the new page.
1531          */
1532         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1533                 global $wgOut;
1534
1535                 $fname = 'Article::showArticle';
1536                 wfProfileIn( $fname );
1537
1538                 # Output the redirect
1539                 if( $this->isRedirect( $text ) )
1540                         $r = 'redirect=no';
1541                 else
1542                         $r = '';
1543                 $wgOut->redirect( $this->mTitle->getFullURL( $r ).$sectionanchor );
1544
1545                 wfProfileOut( $fname );
1546         }
1547
1548         /**
1549          * Mark this particular edit as patrolled
1550          */
1551         function markpatrolled() {
1552                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUser;
1553                 $wgOut->setRobotpolicy( 'noindex,follow' );
1554
1555                 # Check RC patrol config. option
1556                 if( !$wgUseRCPatrol ) {
1557                         $wgOut->errorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1558                         return;
1559                 }
1560
1561                 # Check permissions
1562                 if( !$wgUser->isAllowed( 'patrol' ) ) {
1563                         $wgOut->permissionRequired( 'patrol' );
1564                         return;
1565                 }
1566
1567                 $rcid = $wgRequest->getVal( 'rcid' );
1568                 if ( !is_null ( $rcid ) ) {
1569                         if( wfRunHooks( 'MarkPatrolled', array( &$rcid, &$wgUser, false ) ) ) {
1570                                 require_once( 'RecentChange.php' );
1571                                 RecentChange::markPatrolled( $rcid );
1572                                 wfRunHooks( 'MarkPatrolledComplete', array( &$rcid, &$wgUser, false ) );
1573                                 $wgOut->setPagetitle( wfMsg( 'markedaspatrolled' ) );
1574                                 $wgOut->addWikiText( wfMsg( 'markedaspatrolledtext' ) );
1575                         }
1576                         $rcTitle = Title::makeTitle( NS_SPECIAL, 'Recentchanges' );
1577                         $wgOut->returnToMain( false, $rcTitle->getPrefixedText() );
1578                 }
1579                 else {
1580                         $wgOut->errorpage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1581                 }
1582         }
1583
1584         /**
1585          * User-interface handler for the "watch" action
1586          */
1587
1588         function watch() {
1589
1590                 global $wgUser, $wgOut;
1591
1592                 if ( $wgUser->isAnon() ) {
1593                         $wgOut->errorpage( 'watchnologin', 'watchnologintext' );
1594                         return;
1595                 }
1596                 if ( wfReadOnly() ) {
1597                         $wgOut->readOnlyPage();
1598                         return;
1599                 }
1600
1601                 if( $this->doWatch() ) {
1602                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1603                         $wgOut->setRobotpolicy( 'noindex,follow' );
1604
1605                         $link = $this->mTitle->getPrefixedText();
1606                         $text = wfMsg( 'addedwatchtext', $link );
1607                         $wgOut->addWikiText( $text );
1608                 }
1609
1610                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1611         }
1612
1613         /**
1614          * Add this page to $wgUser's watchlist
1615          * @return bool true on successful watch operation
1616          */
1617         function doWatch() {
1618                 global $wgUser;
1619                 if( $wgUser->isAnon() ) {
1620                         return false;
1621                 }
1622
1623                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1624                         $wgUser->addWatch( $this->mTitle );
1625                         $wgUser->saveSettings();
1626
1627                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1628                 }
1629
1630                 return false;
1631         }
1632
1633         /**
1634          * User interface handler for the "unwatch" action.
1635          */
1636         function unwatch() {
1637
1638                 global $wgUser, $wgOut;
1639
1640                 if ( $wgUser->isAnon() ) {
1641                         $wgOut->errorpage( 'watchnologin', 'watchnologintext' );
1642                         return;
1643                 }
1644                 if ( wfReadOnly() ) {
1645                         $wgOut->readOnlyPage();
1646                         return;
1647                 }
1648
1649                 if( $this->doUnwatch() ) {
1650                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1651                         $wgOut->setRobotpolicy( 'noindex,follow' );
1652
1653                         $link = $this->mTitle->getPrefixedText();
1654                         $text = wfMsg( 'removedwatchtext', $link );
1655                         $wgOut->addWikiText( $text );
1656                 }
1657
1658                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1659         }
1660
1661         /**
1662          * Stop watching a page
1663          * @return bool true on successful unwatch
1664          */
1665         function doUnwatch() {
1666                 global $wgUser;
1667                 if( $wgUser->isAnon() ) {
1668                         return false;
1669                 }
1670
1671                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1672                         $wgUser->removeWatch( $this->mTitle );
1673                         $wgUser->saveSettings();
1674
1675                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1676                 }
1677
1678                 return false;
1679         }
1680
1681         /**
1682          * action=protect handler
1683          */
1684         function protect() {
1685                 require_once 'ProtectionForm.php';
1686                 $form = new ProtectionForm( $this );
1687                 $form->show();
1688         }
1689
1690         /**
1691          * action=unprotect handler (alias)
1692          */
1693         function unprotect() {
1694                 $this->protect();
1695         }
1696
1697         /**
1698          * Update the article's restriction field, and leave a log entry.
1699          *
1700          * @param array $limit set of restriction keys
1701          * @param string $reason
1702          * @return bool true on success
1703          */
1704         function updateRestrictions( $limit = array(), $reason = '' ) {
1705                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1706
1707                 $id = $this->mTitle->getArticleID();
1708                 if( !$wgUser->isAllowed( 'protect' ) || wfReadOnly() || $id == 0 ) {
1709                         return false;
1710                 }
1711
1712                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1713                 # we expect a single selection, but the schema allows otherwise.
1714                 $current = array();
1715                 foreach( $wgRestrictionTypes as $action )
1716                         $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1717
1718                 $current = Article::flattenRestrictions( $current );
1719                 $updated = Article::flattenRestrictions( $limit );
1720
1721                 $changed = ( $current != $updated );
1722                 $protect = ( $updated != '' );
1723
1724                 # If nothing's changed, do nothing
1725                 if( $changed ) {
1726                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1727
1728                                 $dbw =& wfGetDB( DB_MASTER );
1729
1730                                 # Prepare a null revision to be added to the history
1731                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $protect ? 'protectedarticle' : 'unprotectedarticle', $this->mTitle->getPrefixedText() ) );
1732                                 if( $reason )
1733                                         $comment .= ": $reason";
1734                                 if( $protect )
1735                                         $comment .= " [$updated]";
1736                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $comment, true );
1737                                 $nullRevId = $nullRevision->insertOn( $dbw );
1738
1739                                 # Update page record
1740                                 $dbw->update( 'page',
1741                                         array( /* SET */
1742                                                 'page_touched' => $dbw->timestamp(),
1743                                                 'page_restrictions' => $updated,
1744                                                 'page_latest' => $nullRevId
1745                                         ), array( /* WHERE */
1746                                                 'page_id' => $id
1747                                         ), 'Article::protect'
1748                                 );
1749                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1750
1751                                 # Update the protection log
1752                                 $log = new LogPage( 'protect' );
1753                                 if( $protect ) {
1754                                         $log->addEntry( 'protect', $this->mTitle, trim( $reason . " [$updated]" ) );
1755                                 } else {
1756                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1757                                 }
1758
1759                         } # End hook
1760                 } # End "changed" check
1761
1762                 return true;
1763         }
1764
1765         /**
1766          * Take an array of page restrictions and flatten it to a string
1767          * suitable for insertion into the page_restrictions field.
1768          * @param array $limit
1769          * @return string
1770          * @private
1771          */
1772         function flattenRestrictions( $limit ) {
1773                 if( !is_array( $limit ) ) {
1774                         wfDebugDieBacktrace( 'Article::flattenRestrictions given non-array restriction set' );
1775                 }
1776                 $bits = array();
1777                 ksort( $limit );
1778                 foreach( $limit as $action => $restrictions ) {
1779                         if( $restrictions != '' ) {
1780                                 $bits[] = "$action=$restrictions";
1781                         }
1782                 }
1783                 return implode( ':', $bits );
1784         }
1785
1786         /*
1787          * UI entry point for page deletion
1788          */
1789         function delete() {
1790                 global $wgUser, $wgOut, $wgRequest;
1791                 $fname = 'Article::delete';
1792                 $confirm = $wgRequest->wasPosted() &&
1793                         $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1794                 $reason = $wgRequest->getText( 'wpReason' );
1795
1796                 # This code desperately needs to be totally rewritten
1797
1798                 # Check permissions
1799                 if( $wgUser->isAllowed( 'delete' ) ) {
1800                         if( $wgUser->isBlocked() ) {
1801                                 $wgOut->blockedPage();
1802                                 return;
1803                         }
1804                 } else {
1805                         $wgOut->permissionRequired( 'delete' );
1806                         return;
1807                 }
1808
1809                 if( wfReadOnly() ) {
1810                         $wgOut->readOnlyPage();
1811                         return;
1812                 }
1813
1814                 $wgOut->setPagetitle( wfMsg( 'confirmdelete' ) );
1815
1816                 # Better double-check that it hasn't been deleted yet!
1817                 $dbw =& wfGetDB( DB_MASTER );
1818                 $conds = $this->mTitle->pageCond();
1819                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, $fname );
1820                 if ( $latest === false ) {
1821                         $wgOut->fatalError( wfMsg( 'cannotdelete' ) );
1822                         return;
1823                 }
1824
1825                 if( $confirm ) {
1826                         $this->doDelete( $reason );
1827                         return;
1828                 }
1829
1830                 # determine whether this page has earlier revisions
1831                 # and insert a warning if it does
1832                 $maxRevisions = 20;
1833                 $authors = $this->getLastNAuthors( $maxRevisions, $latest );
1834
1835                 if( count( $authors ) > 1 && !$confirm ) {
1836                         $skin=$wgUser->getSkin();
1837                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
1838                 }
1839
1840                 # If a single user is responsible for all revisions, find out who they are
1841                 if ( count( $authors ) == $maxRevisions ) {
1842                         // Query bailed out, too many revisions to find out if they're all the same
1843                         $authorOfAll = false;
1844                 } else {
1845                         $authorOfAll = reset( $authors );
1846                         foreach ( $authors as $author ) {
1847                                 if ( $authorOfAll != $author ) {
1848                                         $authorOfAll = false;
1849                                         break;
1850                                 }
1851                         }
1852                 }
1853                 # Fetch article text
1854                 $rev = Revision::newFromTitle( $this->mTitle );
1855
1856                 if( !is_null( $rev ) ) {
1857                         # if this is a mini-text, we can paste part of it into the deletion reason
1858                         $text = $rev->getText();
1859
1860                         #if this is empty, an earlier revision may contain "useful" text
1861                         $blanked = false;
1862                         if( $text == '' ) {
1863                                 $prev = $rev->getPrevious();
1864                                 if( $prev ) {
1865                                         $text = $prev->getText();
1866                                         $blanked = true;
1867                                 }
1868                         }
1869
1870                         $length = strlen( $text );
1871
1872                         # this should not happen, since it is not possible to store an empty, new
1873                         # page. Let's insert a standard text in case it does, though
1874                         if( $length == 0 && $reason === '' ) {
1875                                 $reason = wfMsgForContent( 'exblank' );
1876                         }
1877
1878                         if( $length < 500 && $reason === '' ) {
1879                                 # comment field=255, let's grep the first 150 to have some user
1880                                 # space left
1881                                 global $wgContLang;
1882                                 $text = $wgContLang->truncate( $text, 150, '...' );
1883
1884                                 # let's strip out newlines
1885                                 $text = preg_replace( "/[\n\r]/", '', $text );
1886
1887                                 if( !$blanked ) {
1888                                         if( $authorOfAll === false ) {
1889                                                 $reason = wfMsgForContent( 'excontent', $text );
1890                                         } else {
1891                                                 $reason = wfMsgForContent( 'excontentauthor', $text, $authorOfAll );
1892                                         }
1893                                 } else {
1894                                         $reason = wfMsgForContent( 'exbeforeblank', $text );
1895                                 }
1896                         }
1897                 }
1898
1899                 return $this->confirmDelete( '', $reason );
1900         }
1901
1902         /**
1903          * Get the last N authors
1904          * @param int $num Number of revisions to get
1905          * @param string $revLatest The latest rev_id, selected from the master (optional)
1906          * @return array Array of authors, duplicates not removed
1907          */
1908         function getLastNAuthors( $num, $revLatest = 0 ) {
1909                 $fname = 'Article::getLastNAuthors';
1910                 wfProfileIn( $fname );
1911
1912                 // First try the slave
1913                 // If that doesn't have the latest revision, try the master
1914                 $continue = 2;
1915                 $db =& wfGetDB( DB_SLAVE );
1916                 do {
1917                         $res = $db->select( array( 'page', 'revision' ),
1918                                 array( 'rev_id', 'rev_user_text' ),
1919                                 array(
1920                                         'page_namespace' => $this->mTitle->getNamespace(),
1921                                         'page_title' => $this->mTitle->getDBkey(),
1922                                         'rev_page = page_id'
1923                                 ), $fname, $this->getSelectOptions( array(
1924                                         'ORDER BY' => 'rev_timestamp DESC',
1925                                         'LIMIT' => $num
1926                                 ) )
1927                         );
1928                         if ( !$res ) {
1929                                 wfProfileOut( $fname );
1930                                 return array();
1931                         }
1932                         $row = $db->fetchObject( $res );
1933                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1934                                 $db =& wfGetDB( DB_MASTER );
1935                                 $continue--;
1936                         } else {
1937                                 $continue = 0;
1938                         }
1939                 } while ( $continue );
1940
1941                 $authors = array( $row->rev_user_text );
1942                 while ( $row = $db->fetchObject( $res ) ) {
1943                         $authors[] = $row->rev_user_text;
1944                 }
1945                 wfProfileOut( $fname );
1946                 return $authors;
1947         }
1948
1949         /**
1950          * Output deletion confirmation dialog
1951          */
1952         function confirmDelete( $par, $reason ) {
1953                 global $wgOut, $wgUser;
1954
1955                 wfDebug( "Article::confirmDelete\n" );
1956
1957                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
1958                 $wgOut->setSubtitle( wfMsg( 'deletesub', $sub ) );
1959                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1960                 $wgOut->addWikiText( wfMsg( 'confirmdeletetext' ) );
1961
1962                 $formaction = $this->mTitle->escapeLocalURL( 'action=delete' . $par );
1963
1964                 $confirm = htmlspecialchars( wfMsg( 'deletepage' ) );
1965                 $delcom = htmlspecialchars( wfMsg( 'deletecomment' ) );
1966                 $token = htmlspecialchars( $wgUser->editToken() );
1967
1968                 $wgOut->addHTML( "
1969 <form id='deleteconfirm' method='post' action=\"{$formaction}\">
1970         <table border='0'>
1971                 <tr>
1972                         <td align='right'>
1973                                 <label for='wpReason'>{$delcom}:</label>
1974                         </td>
1975                         <td align='left'>
1976                                 <input type='text' size='60' name='wpReason' id='wpReason' value=\"" . htmlspecialchars( $reason ) . "\" />
1977                         </td>
1978                 </tr>
1979                 <tr>
1980                         <td>&nbsp;</td>
1981                         <td>
1982                                 <input type='submit' name='wpConfirmB' value=\"{$confirm}\" />
1983                         </td>
1984                 </tr>
1985         </table>
1986         <input type='hidden' name='wpEditToken' value=\"{$token}\" />
1987 </form>\n" );
1988
1989                 $wgOut->returnToMain( false );
1990         }
1991
1992
1993         /**
1994          * Perform a deletion and output success or failure messages
1995          */
1996         function doDelete( $reason ) {
1997                 global $wgOut, $wgUser;
1998                 $fname = 'Article::doDelete';
1999                 wfDebug( $fname."\n" );
2000
2001                 if (wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason))) {
2002                         if ( $this->doDeleteArticle( $reason ) ) {
2003                                 $deleted = $this->mTitle->getPrefixedText();
2004
2005                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2006                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2007
2008                                 $loglink = '[[Special:Log/delete|' . wfMsg( 'deletionlog' ) . ']]';
2009                                 $text = wfMsg( 'deletedtext', $deleted, $loglink );
2010
2011                                 $wgOut->addWikiText( $text );
2012                                 $wgOut->returnToMain( false );
2013                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason));
2014                         } else {
2015                                 $wgOut->fatalError( wfMsg( 'cannotdelete' ) );
2016                         }
2017                 }
2018         }
2019
2020         /**
2021          * Back-end article deletion
2022          * Deletes the article with database consistency, writes logs, purges caches
2023          * Returns success
2024          */
2025         function doDeleteArticle( $reason ) {
2026                 global $wgUseSquid, $wgDeferredUpdateList;
2027                 global $wgPostCommitUpdateList, $wgUseTrackbacks;
2028
2029                 $fname = 'Article::doDeleteArticle';
2030                 wfDebug( $fname."\n" );
2031
2032                 $dbw =& wfGetDB( DB_MASTER );
2033                 $ns = $this->mTitle->getNamespace();
2034                 $t = $this->mTitle->getDBkey();
2035                 $id = $this->mTitle->getArticleID();
2036
2037                 if ( $t == '' || $id == 0 ) {
2038                         return false;
2039                 }
2040
2041                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
2042                 array_push( $wgDeferredUpdateList, $u );
2043
2044                 $linksTo = $this->mTitle->getLinksTo();
2045
2046                 # Squid purging
2047                 if ( $wgUseSquid ) {
2048                         $urls = array(
2049                                 $this->mTitle->getInternalURL(),
2050                                 $this->mTitle->getInternalURL( 'history' )
2051                         );
2052
2053                         $u = SquidUpdate::newFromTitles( $linksTo, $urls );
2054                         array_push( $wgPostCommitUpdateList, $u );
2055
2056                 }
2057
2058                 # Client and file cache invalidation
2059                 Title::touchArray( $linksTo );
2060
2061
2062                 // For now, shunt the revision data into the archive table.
2063                 // Text is *not* removed from the text table; bulk storage
2064                 // is left intact to avoid breaking block-compression or
2065                 // immutable storage schemes.
2066                 //
2067                 // For backwards compatibility, note that some older archive
2068                 // table entries will have ar_text and ar_flags fields still.
2069                 //
2070                 // In the future, we may keep revisions and mark them with
2071                 // the rev_deleted field, which is reserved for this purpose.
2072                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2073                         array(
2074                                 'ar_namespace'  => 'page_namespace',
2075                                 'ar_title'      => 'page_title',
2076                                 'ar_comment'    => 'rev_comment',
2077                                 'ar_user'       => 'rev_user',
2078                                 'ar_user_text'  => 'rev_user_text',
2079                                 'ar_timestamp'  => 'rev_timestamp',
2080                                 'ar_minor_edit' => 'rev_minor_edit',
2081                                 'ar_rev_id'     => 'rev_id',
2082                                 'ar_text_id'    => 'rev_text_id',
2083                         ), array(
2084                                 'page_id' => $id,
2085                                 'page_id = rev_page'
2086                         ), $fname
2087                 );
2088
2089                 # Now that it's safely backed up, delete it
2090                 $dbw->delete( 'revision', array( 'rev_page' => $id ), $fname );
2091                 $dbw->delete( 'page', array( 'page_id' => $id ), $fname);
2092
2093                 if ($wgUseTrackbacks)
2094                         $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), $fname );
2095
2096                 # Clean up recentchanges entries...
2097                 $dbw->delete( 'recentchanges', array( 'rc_namespace' => $ns, 'rc_title' => $t ), $fname );
2098
2099                 # Finally, clean up the link tables
2100                 $t = $this->mTitle->getPrefixedDBkey();
2101
2102                 Article::onArticleDelete( $this->mTitle );
2103
2104                 # Delete outgoing links
2105                 $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2106                 $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2107                 $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2108                 $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2109                 $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2110                 $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2111
2112                 # Log the deletion
2113                 $log = new LogPage( 'delete' );
2114                 $log->addEntry( 'delete', $this->mTitle, $reason );
2115
2116                 # Clear the cached article id so the interface doesn't act like we exist
2117                 $this->mTitle->resetArticleID( 0 );
2118                 $this->mTitle->mArticleID = 0;
2119                 return true;
2120         }
2121
2122         /**
2123          * Revert a modification
2124          */
2125         function rollback() {
2126                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2127                 $fname = 'Article::rollback';
2128
2129                 if( $wgUser->isAllowed( 'rollback' ) ) {
2130                         if( $wgUser->isBlocked() ) {
2131                                 $wgOut->blockedPage();
2132                                 return;
2133                         }
2134                 } else {
2135                         $wgOut->permissionRequired( 'rollback' );
2136                         return;
2137                 }
2138
2139                 if ( wfReadOnly() ) {
2140                         $wgOut->readOnlyPage( $this->getContent() );
2141                         return;
2142                 }
2143                 if( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ),
2144                         array( $this->mTitle->getPrefixedText(),
2145                                 $wgRequest->getVal( 'from' ) )  ) ) {
2146                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2147                         $wgOut->addWikiText( wfMsg( 'sessionfailure' ) );
2148                         return;
2149                 }
2150                 $dbw =& wfGetDB( DB_MASTER );
2151
2152                 # Enhanced rollback, marks edits rc_bot=1
2153                 $bot = $wgRequest->getBool( 'bot' );
2154
2155                 # Replace all this user's current edits with the next one down
2156                 $tt = $this->mTitle->getDBKey();
2157                 $n = $this->mTitle->getNamespace();
2158
2159                 # Get the last editor, lock table exclusively
2160                 $dbw->begin();
2161                 $current = Revision::newFromTitle( $this->mTitle );
2162                 if( is_null( $current ) ) {
2163                         # Something wrong... no page?
2164                         $dbw->rollback();
2165                         $wgOut->addHTML( wfMsg( 'notanarticle' ) );
2166                         return;
2167                 }
2168
2169                 $from = str_replace( '_', ' ', $wgRequest->getVal( 'from' ) );
2170                 if( $from != $current->getUserText() ) {
2171                         $wgOut->setPageTitle( wfMsg('rollbackfailed') );
2172                         $wgOut->addWikiText( wfMsg( 'alreadyrolled',
2173                                 htmlspecialchars( $this->mTitle->getPrefixedText()),
2174                                 htmlspecialchars( $from ),
2175                                 htmlspecialchars( $current->getUserText() ) ) );
2176                         if( $current->getComment() != '') {
2177                                 $wgOut->addHTML(
2178                                         wfMsg( 'editcomment',
2179                                         htmlspecialchars( $current->getComment() ) ) );
2180                         }
2181                         return;
2182                 }
2183
2184                 # Get the last edit not by this guy
2185                 $user = intval( $current->getUser() );
2186                 $user_text = $dbw->addQuotes( $current->getUserText() );
2187                 $s = $dbw->selectRow( 'revision',
2188                         array( 'rev_id', 'rev_timestamp' ),
2189                         array(
2190                                 'rev_page' => $current->getPage(),
2191                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
2192                         ), $fname,
2193                         array(
2194                                 'USE INDEX' => 'page_timestamp',
2195                                 'ORDER BY'  => 'rev_timestamp DESC' )
2196                         );
2197                 if( $s === false ) {
2198                         # Something wrong
2199                         $dbw->rollback();
2200                         $wgOut->setPageTitle(wfMsg('rollbackfailed'));
2201                         $wgOut->addHTML( wfMsg( 'cantrollback' ) );
2202                         return;
2203                 }
2204
2205                 $set = array();
2206                 if ( $bot ) {
2207                         # Mark all reverted edits as bot
2208                         $set['rc_bot'] = 1;
2209                 }
2210                 if ( $wgUseRCPatrol ) {
2211                         # Mark all reverted edits as patrolled
2212                         $set['rc_patrolled'] = 1;
2213                 }
2214
2215                 if ( $set ) {
2216                         $dbw->update( 'recentchanges', $set,
2217                                 array( /* WHERE */
2218                                         'rc_cur_id'    => $current->getPage(),
2219                                         'rc_user_text' => $current->getUserText(),
2220                                         "rc_timestamp > '{$s->rev_timestamp}'",
2221                                 ), $fname
2222                         );
2223                 }
2224
2225                 # Get the edit summary
2226                 $target = Revision::newFromId( $s->rev_id );
2227                 $newComment = wfMsgForContent( 'revertpage', $target->getUserText(), $from );
2228                 $newComment = $wgRequest->getText( 'summary', $newComment );
2229
2230                 # Save it!
2231                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2232                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2233                 $wgOut->addHTML( '<h2>' . htmlspecialchars( $newComment ) . "</h2>\n<hr />\n" );
2234
2235                 $this->updateArticle( $target->getText(), $newComment, 1, $this->mTitle->userIsWatching(), $bot );
2236                 Article::onArticleEdit( $this->mTitle );
2237
2238                 $dbw->commit();
2239                 $wgOut->returnToMain( false );
2240         }
2241
2242
2243         /**
2244          * Do standard deferred updates after page view
2245          * @private
2246          */
2247         function viewUpdates() {
2248                 global $wgDeferredUpdateList;
2249
2250                 if ( 0 != $this->getID() ) {
2251                         global $wgDisableCounters;
2252                         if( !$wgDisableCounters ) {
2253                                 Article::incViewCount( $this->getID() );
2254                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2255                                 array_push( $wgDeferredUpdateList, $u );
2256                         }
2257                 }
2258
2259                 # Update newtalk / watchlist notification status
2260                 global $wgUser;
2261                 $wgUser->clearNotification( $this->mTitle );
2262         }
2263
2264         /**
2265          * Do standard deferred updates after page edit.
2266          * Every 1000th edit, prune the recent changes table.
2267          * @private
2268          * @param string $text
2269          */
2270         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid) {
2271                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser;
2272
2273                 $fname = 'Article::editUpdates';
2274                 wfProfileIn( $fname );
2275
2276                 # Parse the text
2277                 $options = new ParserOptions;
2278                 $options->setTidy(true);
2279                 $poutput = $wgParser->parse( $text, $this->mTitle, $options, true, true, $newid );
2280
2281                 # Save it to the parser cache
2282                 $parserCache =& ParserCache::singleton();
2283                 $parserCache->save( $poutput, $this, $wgUser );
2284
2285                 # Update the links tables
2286                 $u = new LinksUpdate( $this->mTitle, $poutput );
2287                 $u->doUpdate();
2288
2289                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2290                         wfSeedRandom();
2291                         if ( 0 == mt_rand( 0, 999 ) ) {
2292                                 # Periodically flush old entries from the recentchanges table.
2293                                 global $wgRCMaxAge;
2294
2295                                 $dbw =& wfGetDB( DB_MASTER );
2296                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2297                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2298                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2299                                 $dbw->query( $sql );
2300                         }
2301                 }
2302
2303                 $id = $this->getID();
2304                 $title = $this->mTitle->getPrefixedDBkey();
2305                 $shortTitle = $this->mTitle->getDBkey();
2306
2307                 if ( 0 == $id ) {
2308                         wfProfileOut( $fname );
2309                         return;
2310                 }
2311
2312                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2313                 array_push( $wgDeferredUpdateList, $u );
2314                 $u = new SearchUpdate( $id, $title, $text );
2315                 array_push( $wgDeferredUpdateList, $u );
2316
2317                 # If this is another user's talk page, update newtalk
2318
2319                 if ($this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getName()) {
2320                         if (wfRunHooks('ArticleEditUpdateNewTalk', array(&$this)) ) {
2321                                 $other = User::newFromName( $shortTitle );
2322                                 if( is_null( $other ) && User::isIP( $shortTitle ) ) {
2323                                         // An anonymous user
2324                                         $other = new User();
2325                                         $other->setName( $shortTitle );
2326                                 }
2327                                 if( $other ) {
2328                                         $other->setNewtalk( true );
2329                                 }
2330                         }
2331                 }
2332
2333                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2334                         $wgMessageCache->replace( $shortTitle, $text );
2335                 }
2336
2337                 wfProfileOut( $fname );
2338         }
2339
2340         /**
2341          * Generate the navigation links when browsing through an article revisions
2342          * It shows the information as:
2343          *   Revision as of \<date\>; view current revision
2344          *   \<- Previous version | Next Version -\>
2345          *
2346          * @private
2347          * @param string $oldid         Revision ID of this article revision
2348          */
2349         function setOldSubtitle( $oldid=0 ) {
2350                 global $wgLang, $wgOut, $wgUser;
2351
2352                 $current = ( $oldid == $this->mLatest );
2353                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2354                 $sk = $wgUser->getSkin();
2355                 $lnk = $current
2356                         ? wfMsg( 'currentrevisionlink' )
2357                         : $lnk = $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2358                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2359                 $prevlink = $prev
2360                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2361                         : wfMsg( 'previousrevision' );
2362                 $nextlink = $current
2363                         ? wfMsg( 'nextrevision' )
2364                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2365                 $r = wfMsg( 'revisionasofwithlink', $td, $lnk, $prevlink, $nextlink );
2366                 $wgOut->setSubtitle( $r );
2367         }
2368
2369         /**
2370          * This function is called right before saving the wikitext,
2371          * so we can do things like signatures and links-in-context.
2372          *
2373          * @param string $text
2374          */
2375         function preSaveTransform( $text ) {
2376                 global $wgParser, $wgUser;
2377                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2378         }
2379
2380         /* Caching functions */
2381
2382         /**
2383          * checkLastModified returns true if it has taken care of all
2384          * output to the client that is necessary for this request.
2385          * (that is, it has sent a cached version of the page)
2386          */
2387         function tryFileCache() {
2388                 static $called = false;
2389                 if( $called ) {
2390                         wfDebug( " tryFileCache() -- called twice!?\n" );
2391                         return;
2392                 }
2393                 $called = true;
2394                 if($this->isFileCacheable()) {
2395                         $touched = $this->mTouched;
2396                         $cache = new CacheManager( $this->mTitle );
2397                         if($cache->isFileCacheGood( $touched )) {
2398                                 wfDebug( " tryFileCache() - about to load\n" );
2399                                 $cache->loadFromFileCache();
2400                                 return true;
2401                         } else {
2402                                 wfDebug( " tryFileCache() - starting buffer\n" );
2403                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2404                         }
2405                 } else {
2406                         wfDebug( " tryFileCache() - not cacheable\n" );
2407                 }
2408         }
2409
2410         /**
2411          * Check if the page can be cached
2412          * @return bool
2413          */
2414         function isFileCacheable() {
2415                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest;
2416                 extract( $wgRequest->getValues( 'action', 'oldid', 'diff', 'redirect', 'printable' ) );
2417
2418                 return $wgUseFileCache
2419                         and (!$wgShowIPinHeader)
2420                         and ($this->getID() != 0)
2421                         and ($wgUser->isAnon())
2422                         and (!$wgUser->getNewtalk())
2423                         and ($this->mTitle->getNamespace() != NS_SPECIAL )
2424                         and (empty( $action ) || $action == 'view')
2425                         and (!isset($oldid))
2426                         and (!isset($diff))
2427                         and (!isset($redirect))
2428                         and (!isset($printable))
2429                         and (!$this->mRedirectedFrom);
2430         }
2431
2432         /**
2433          * Loads page_touched and returns a value indicating if it should be used
2434          *
2435          */
2436         function checkTouched() {
2437                 $fname = 'Article::checkTouched';
2438                 if( !$this->mDataLoaded ) {
2439                         $this->loadPageData();
2440                 }
2441                 return !$this->mIsRedirect;
2442         }
2443
2444         /**
2445          * Get the page_touched field
2446          */
2447         function getTouched() {
2448                 # Ensure that page data has been loaded
2449                 if( !$this->mDataLoaded ) {
2450                         $this->loadPageData();
2451                 }
2452                 return $this->mTouched;
2453         }
2454
2455         /**
2456          * Get the page_latest field
2457          */
2458         function getLatest() {
2459                 if ( !$this->mDataLoaded ) {
2460                         $this->loadPageData();
2461                 }
2462                 return $this->mLatest;
2463         }
2464
2465         /**
2466          * Edit an article without doing all that other stuff
2467          * The article must already exist; link tables etc
2468          * are not updated, caches are not flushed.
2469          *
2470          * @param string $text text submitted
2471          * @param string $comment comment submitted
2472          * @param bool $minor whereas it's a minor modification
2473          */
2474         function quickEdit( $text, $comment = '', $minor = 0 ) {
2475                 $fname = 'Article::quickEdit';
2476                 wfProfileIn( $fname );
2477
2478                 $dbw =& wfGetDB( DB_MASTER );
2479                 $dbw->begin();
2480                 $revision = new Revision( array(
2481                         'page'       => $this->getId(),
2482                         'text'       => $text,
2483                         'comment'    => $comment,
2484                         'minor_edit' => $minor ? 1 : 0,
2485                         ) );
2486                 $revisionId = $revision->insertOn( $dbw );
2487                 $this->updateRevisionOn( $dbw, $revision );
2488                 $dbw->commit();
2489
2490                 wfProfileOut( $fname );
2491         }
2492
2493         /**
2494          * Used to increment the view counter
2495          *
2496          * @static
2497          * @param integer $id article id
2498          */
2499         function incViewCount( $id ) {
2500                 $id = intval( $id );
2501                 global $wgHitcounterUpdateFreq, $wgDBtype;
2502
2503                 $dbw =& wfGetDB( DB_MASTER );
2504                 $pageTable = $dbw->tableName( 'page' );
2505                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
2506                 $acchitsTable = $dbw->tableName( 'acchits' );
2507
2508                 if( $wgHitcounterUpdateFreq <= 1 ){ //
2509                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
2510                         return;
2511                 }
2512
2513                 # Not important enough to warrant an error page in case of failure
2514                 $oldignore = $dbw->ignoreErrors( true );
2515
2516                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
2517
2518                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
2519                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
2520                         # Most of the time (or on SQL errors), skip row count check
2521                         $dbw->ignoreErrors( $oldignore );
2522                         return;
2523                 }
2524
2525                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
2526                 $row = $dbw->fetchObject( $res );
2527                 $rown = intval( $row->n );
2528                 if( $rown >= $wgHitcounterUpdateFreq ){
2529                         wfProfileIn( 'Article::incViewCount-collect' );
2530                         $old_user_abort = ignore_user_abort( true );
2531
2532                         if ($wgDBtype == 'mysql')
2533                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
2534                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
2535                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype".
2536                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
2537                                 'GROUP BY hc_id');
2538                         $dbw->query("DELETE FROM $hitcounterTable");
2539                         if ($wgDBtype == 'mysql')
2540                                 $dbw->query('UNLOCK TABLES');
2541                         $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
2542                                 'WHERE page_id = hc_id');
2543                         $dbw->query("DROP TABLE $acchitsTable");
2544
2545                         ignore_user_abort( $old_user_abort );
2546                         wfProfileOut( 'Article::incViewCount-collect' );
2547                 }
2548                 $dbw->ignoreErrors( $oldignore );
2549         }
2550
2551         /**#@+
2552          * The onArticle*() functions are supposed to be a kind of hooks
2553          * which should be called whenever any of the specified actions
2554          * are done.
2555          *
2556          * This is a good place to put code to clear caches, for instance.
2557          *
2558          * This is called on page move and undelete, as well as edit
2559          * @static
2560          * @param $title_obj a title object
2561          */
2562
2563         function onArticleCreate($title_obj) {
2564                 global $wgUseSquid, $wgPostCommitUpdateList;
2565
2566                 $title_obj->touchLinks();
2567                 $titles = $title_obj->getLinksTo();
2568
2569                 # Purge squid
2570                 if ( $wgUseSquid ) {
2571                         $urls = $title_obj->getSquidURLs();
2572                         foreach ( $titles as $linkTitle ) {
2573                                 $urls[] = $linkTitle->getInternalURL();
2574                         }
2575                         $u = new SquidUpdate( $urls );
2576                         array_push( $wgPostCommitUpdateList, $u );
2577                 }
2578         }
2579
2580         function onArticleDelete( $title ) {
2581                 global $wgMessageCache;
2582
2583                 $title->touchLinks();
2584
2585                 if( $title->getNamespace() == NS_MEDIAWIKI) {
2586                         $wgMessageCache->replace( $title->getDBkey(), false );
2587                 }
2588         }
2589
2590         /**
2591          * Purge caches on page update etc
2592          */
2593         function onArticleEdit( $title ) {
2594                 global $wgUseSquid, $wgPostCommitUpdateList, $wgUseFileCache;
2595
2596                 $urls = array();
2597
2598                 // Template namespace? Purge all articles linking here.
2599                 // FIXME: When a templatelinks table arrives, use it for all includes.
2600                 if ( $title->getNamespace() == NS_TEMPLATE) {
2601                         $titles = $title->getLinksTo();
2602                         Title::touchArray( $titles );
2603                         if ( $wgUseSquid ) {
2604                                 foreach ( $titles as $link ) {
2605                                         $urls[] = $link->getInternalURL();
2606                                 }
2607                         }
2608                 }
2609
2610                 # Squid updates
2611                 if ( $wgUseSquid ) {
2612                         $urls = array_merge( $urls, $title->getSquidURLs() );
2613                         $u = new SquidUpdate( $urls );
2614                         array_push( $wgPostCommitUpdateList, $u );
2615                 }
2616
2617                 # File cache
2618                 if ( $wgUseFileCache ) {
2619                         $cm = new CacheManager( $title );
2620                         @unlink( $cm->fileCacheName() );
2621                 }
2622         }
2623
2624         /**#@-*/
2625
2626         /**
2627          * Info about this page
2628          * Called for ?action=info when $wgAllowPageInfo is on.
2629          *
2630          * @public
2631          */
2632         function info() {
2633                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
2634                 $fname = 'Article::info';
2635
2636                 if ( !$wgAllowPageInfo ) {
2637                         $wgOut->errorpage( 'nosuchaction', 'nosuchactiontext' );
2638                         return;
2639                 }
2640
2641                 $page = $this->mTitle->getSubjectPage();
2642
2643                 $wgOut->setPagetitle( $page->getPrefixedText() );
2644                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ));
2645
2646                 # first, see if the page exists at all.
2647                 $exists = $page->getArticleId() != 0;
2648                 if( !$exists ) {
2649                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2650                                 $wgOut->addHTML(wfMsgWeirdKey ( $this->mTitle->getText() ) );
2651                         } else {
2652                                 $wgOut->addHTML(wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' ) );
2653                         }
2654                 } else {
2655                         $dbr =& wfGetDB( DB_SLAVE );
2656                         $wl_clause = array(
2657                                 'wl_title'     => $page->getDBkey(),
2658                                 'wl_namespace' => $page->getNamespace() );
2659                         $numwatchers = $dbr->selectField(
2660                                 'watchlist',
2661                                 'COUNT(*)',
2662                                 $wl_clause,
2663                                 $fname,
2664                                 $this->getSelectOptions() );
2665
2666                         $pageInfo = $this->pageCountInfo( $page );
2667                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
2668
2669                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
2670                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
2671                         if( $talkInfo ) {
2672                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
2673                         }
2674                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
2675                         if( $talkInfo ) {
2676                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
2677                         }
2678                         $wgOut->addHTML( '</ul>' );
2679
2680                 }
2681         }
2682
2683         /**
2684          * Return the total number of edits and number of unique editors
2685          * on a given page. If page does not exist, returns false.
2686          *
2687          * @param Title $title
2688          * @return array
2689          * @private
2690          */
2691         function pageCountInfo( $title ) {
2692                 $id = $title->getArticleId();
2693                 if( $id == 0 ) {
2694                         return false;
2695                 }
2696
2697                 $dbr =& wfGetDB( DB_SLAVE );
2698
2699                 $rev_clause = array( 'rev_page' => $id );
2700                 $fname = 'Article::pageCountInfo';
2701
2702                 $edits = $dbr->selectField(
2703                         'revision',
2704                         'COUNT(rev_page)',
2705                         $rev_clause,
2706                         $fname,
2707                         $this->getSelectOptions() );
2708
2709                 $authors = $dbr->selectField(
2710                         'revision',
2711                         'COUNT(DISTINCT rev_user_text)',
2712                         $rev_clause,
2713                         $fname,
2714                         $this->getSelectOptions() );
2715
2716                 return array( 'edits' => $edits, 'authors' => $authors );
2717         }
2718
2719         /**
2720          * Return a list of templates used by this article.
2721          * Uses the templatelinks table
2722          *
2723          * @return array Array of Title objects
2724          */
2725         function getUsedTemplates() {
2726                 $result = array();
2727                 $id = $this->mTitle->getArticleID();
2728                 if( $id == 0 ) {
2729                         return array();
2730                 }
2731
2732                 $dbr =& wfGetDB( DB_SLAVE );
2733                 $res = $dbr->select( array( 'templatelinks' ),
2734                         array( 'tl_namespace', 'tl_title' ),
2735                         array( 'tl_from' => $id ),
2736                         'Article:getUsedTemplates' );
2737                 if ( false !== $res ) {
2738                         if ( $dbr->numRows( $res ) ) {
2739                                 while ( $row = $dbr->fetchObject( $res ) ) {
2740                                         $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2741                                 }
2742                         }
2743                 }
2744                 $dbr->freeResult( $res );
2745                 return $result;
2746         }
2747 }
2748
2749 ?>