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