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