includes/Article.php

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