includes/Article.php

   1 <?php
   2 # Class representing a Wikipedia article and history.
   3 # See design.doc for an overview.
   4
   5 # Note: edit user interface and cache support functions have been
   6 # moved to separate EditPage and CacheManager classes.
   7
   8 include_once( "CacheManager.php" );
   9
  10 class Article {
  11         /* private */ var $mContent, $mContentLoaded;
  12         /* private */ var $mUser, $mTimestamp, $mUserText;
  13         /* private */ var $mCounter, $mComment, $mCountAdjustment;
  14         /* private */ var $mMinorEdit, $mRedirectedFrom;
  15         /* private */ var $mTouched, $mFileCache, $mTitle;
  16         /* private */ var $mId, $mTable;
  17
  18         function Article( &$title ) {
  19                 $this->mTitle =& $title;
  20                 $this->clear();
  21         }
  22
  23         /* private */ function clear()
  24         {
  25                 $this->mContentLoaded = false;
  26                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
  27                 $this->mRedirectedFrom = $this->mUserText =
  28                 $this->mTimestamp = $this->mComment = $this->mFileCache = "";
  29                 $this->mCountAdjustment = 0;
  30                 $this->mTouched = "19700101000000";
  31         }
  32
  33         /* static */ function getRevisionText( $row, $prefix = "old_" ) {
  34                 # Deal with optional compression of archived pages.
  35                 # This can be done periodically via maintenance/compressOld.php, and
  36                 # as pages are saved if $wgCompressRevisions is set.
  37                 $text = $prefix . "text";
  38                 $flags = $prefix . "flags";
  39                 if( isset( $row->$flags ) && (false !== strpos( $row->$flags, "gzip" ) ) ) {
  40                         return gzinflate( $row->$text );
  41                 }
  42                 if( isset( $row->$text ) ) {
  43                         return $row->$text;
  44                 }
  45                 return false;
  46         }
  47
  48         /* static */ function compressRevisionText( &$text ) {
  49                 global $wgCompressRevisions;
  50                 if( !$wgCompressRevisions ) {
  51                         return "";
  52                 }
  53                 if( !function_exists( "gzdeflate" ) ) {
  54                         wfDebug( "Article::compressRevisionText() -- no zlib support, not compressing\n" );
  55                         return "";
  56                 }
  57                 $text = gzdeflate( $text );
  58                 return "gzip";
  59         }
  60
  61         # Note that getContent/loadContent may follow redirects if
  62         # not told otherwise, and so may cause a change to mTitle.
  63
  64         # Return the text of this revision
  65         function getContent( $noredir = false )
  66         {
  67                 global $wgRequest;
  68
  69                 # Get variables from query string :P
  70                 $action = $wgRequest->getText( 'action', 'view' );
  71                 $section = $wgRequest->getText( 'section' );
  72
  73                 $fname =  "Article::getContent";
  74                 wfProfileIn( $fname );
  75
  76                 if ( 0 == $this->getID() ) {
  77                         if ( "edit" == $action ) {
  78                                 wfProfileOut( $fname );
  79                                 return ""; # was "newarticletext", now moved above the box)
  80                         }
  81                         wfProfileOut( $fname );
  82                         return wfMsg( "noarticletext" );
  83                 } else {
  84                         $this->loadContent( $noredir );
  85
  86                         if(
  87                                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
  88                                 ( $this->mTitle->getNamespace() == Namespace::getTalk( Namespace::getUser()) ) &&
  89                                   preg_match("/^\d{1,3}\.\d{1,3}.\d{1,3}\.\d{1,3}$/",$this->mTitle->getText()) &&
  90                                   $action=="view"
  91                                 )
  92                                 {
  93                                 wfProfileOut( $fname );
  94                                 return $this->mContent . "\n" .wfMsg("anontalkpagetext"); }
  95                         else {
  96                                 if($action=="edit") {
  97                                         if($section!="") {
  98                                                 if($section=="new") {
  99                                                         wfProfileOut( $fname );
 100                                                         return "";
 101                                                 }
 102
 103                                                 $secs=preg_split("/(^=+.*?=+|^<h[1-6].*?>.*?<\/h[1-6].*?>)/mi",
 104                                                  $this->mContent, -1,
 105                                                  PREG_SPLIT_DELIM_CAPTURE);
 106                                                 if($section==0) {
 107                                                         wfProfileOut( $fname );
 108                                                         return trim($secs[0]);
 109                                                 } else {
 110                                                         wfProfileOut( $fname );
 111                                                         return trim($secs[$section*2-1] . $secs[$section*2]);
 112                                                 }
 113                                         }
 114                                 }
 115                                 wfProfileOut( $fname );
 116                                 return $this->mContent;
 117                         }
 118                 }
 119         }
 120
 121         # Load the revision (including cur_text) into this object
 122         function loadContent( $noredir = false )
 123         {
 124                 global $wgOut, $wgMwRedir, $wgRequest;
 125
 126                 # Query variables :P
 127                 $oldid = $wgRequest->getVal( 'oldid' );
 128                 $redirect = $wgRequest->getVal( 'redirect' );
 129
 130                 if ( $this->mContentLoaded ) return;
 131                 $fname = "Article::loadContent";
 132
 133                 # Pre-fill content with error message so that if something
 134                 # fails we'll have something telling us what we intended.
 135
 136                 $t = $this->mTitle->getPrefixedText();
 137                 if ( isset( $oldid ) ) {
 138                         $oldid = IntVal( $oldid );
 139                         $t .= ",oldid={$oldid}";
 140                 }
 141                 if ( isset( $redirect ) ) {
 142                         $redirect = ($redirect == "no") ? "no" : "yes";
 143                         $t .= ",redirect={$redirect}";
 144                 }
 145                 $this->mContent = wfMsg( "missingarticle", $t );
 146
 147                 if ( ! $oldid ) {       # Retrieve current version
 148                         $id = $this->getID();
 149                         if ( 0 == $id ) return;
 150
 151                         $sql = "SELECT " .
 152                           "cur_text,cur_timestamp,cur_user,cur_counter,cur_restrictions,cur_touched " .
 153                           "FROM cur WHERE cur_id={$id}";
 154                         wfDebug( "$sql\n" );
 155                         $res = wfQuery( $sql, DB_READ, $fname );
 156                         if ( 0 == wfNumRows( $res ) ) {
 157                                 return;
 158                         }
 159
 160                         $s = wfFetchObject( $res );
 161                         # If we got a redirect, follow it (unless we've been told
 162                         # not to by either the function parameter or the query
 163                         if ( ( "no" != $redirect ) && ( false == $noredir ) &&
 164                           ( $wgMwRedir->matchStart( $s->cur_text ) ) ) {
 165                                 if ( preg_match( "/\\[\\[([^\\]\\|]+)[\\]\\|]/",
 166                                   $s->cur_text, $m ) ) {
 167                                         $rt = Title::newFromText( $m[1] );
 168                                         if( $rt ) {
 169                                                 # Gotta hand redirects to special pages differently:
 170                                                 # Fill the HTTP response "Location" header and ignore
 171                                                 # the rest of the page we're on.
 172
 173                                                 if ( $rt->getInterwiki() != "" ) {
 174                                                         $wgOut->redirect( $rt->getFullURL() ) ;
 175                                                         return;
 176                                                 }
 177                                                 if ( $rt->getNamespace() == Namespace::getSpecial() ) {
 178                                                         $wgOut->redirect( $rt->getFullURL() );
 179                                                         return;
 180                                                 }
 181                                                 $rid = $rt->getArticleID();
 182                                                 if ( 0 != $rid ) {
 183                                                         $sql = "SELECT cur_text,cur_timestamp,cur_user," .
 184                                                           "cur_counter,cur_restrictions,cur_touched FROM cur WHERE cur_id={$rid}";
 185                                                         $res = wfQuery( $sql, DB_READ, $fname );
 186
 187                                                         if ( 0 != wfNumRows( $res ) ) {
 188                                                                 $this->mRedirectedFrom = $this->mTitle->getPrefixedText();
 189                                                                 $this->mTitle = $rt;
 190                                                                 $s = wfFetchObject( $res );
 191                                                         }
 192                                                 }
 193                                         }
 194                                 }
 195                         }
 196
 197                         $this->mContent = $s->cur_text;
 198                         $this->mUser = $s->cur_user;
 199                         $this->mCounter = $s->cur_counter;
 200                         $this->mTimestamp = $s->cur_timestamp;
 201                         $this->mTouched = $s->cur_touched;
 202                         $this->mTitle->mRestrictions = explode( ",", trim( $s->cur_restrictions ) );
 203                         $this->mTitle->mRestrictionsLoaded = true;
 204                         wfFreeResult( $res );
 205                 } else { # oldid set, retrieve historical version
 206                         $sql = "SELECT old_text,old_timestamp,old_user,old_flags FROM old " .
 207                           "WHERE old_id={$oldid}";
 208                         $res = wfQuery( $sql, DB_READ, $fname );
 209                         if ( 0 == wfNumRows( $res ) ) { return; }
 210
 211                         $s = wfFetchObject( $res );
 212                         $this->mContent = Article::getRevisionText( $s );
 213                         $this->mUser = $s->old_user;
 214                         $this->mCounter = 0;
 215                         $this->mTimestamp = $s->old_timestamp;
 216                         wfFreeResult( $res );
 217                 }
 218                 $this->mContentLoaded = true;
 219                 return $this->mContent;
 220         }
 221
 222         # Gets the article text without using so many damn globals
 223         # Returns false on error
 224         function getContentWithoutUsingSoManyDamnGlobals( $oldid = 0, $noredir = false ) {
 225                 global $wgMwRedir;
 226
 227                 if ( $this->mContentLoaded ) {
 228                         return $this->mContent;
 229                 }
 230                 $this->mContent = false;
 231
 232                 $fname = "Article::loadContent";
 233
 234                 if ( ! $oldid ) {       # Retrieve current version
 235                         $id = $this->getID();
 236                         if ( 0 == $id ) {
 237                                 return false;
 238                         }
 239
 240                         $sql = "SELECT " .
 241                           "cur_text,cur_timestamp,cur_user,cur_counter,cur_restrictions,cur_touched " .
 242                           "FROM cur WHERE cur_id={$id}";
 243                         $res = wfQuery( $sql, DB_READ, $fname );
 244                         if ( 0 == wfNumRows( $res ) ) {
 245                                 return false;
 246                         }
 247
 248                         $s = wfFetchObject( $res );
 249                         # If we got a redirect, follow it (unless we've been told
 250                         # not to by either the function parameter or the query
 251                         if ( !$noredir && $wgMwRedir->matchStart( $s->cur_text ) ) {
 252                                 if ( preg_match( "/\\[\\[([^\\]\\|]+)[\\]\\|]/",
 253                                   $s->cur_text, $m ) ) {
 254                                         $rt = Title::newFromText( $m[1] );
 255                                         if( $rt &&  $rt->getInterwiki() == "" && $rt->getNamespace() != Namespace::getSpecial() ) {
 256                                                 $rid = $rt->getArticleID();
 257                                                 if ( 0 != $rid ) {
 258                                                         $sql = "SELECT cur_text,cur_timestamp,cur_user," .
 259                                                           "cur_counter,cur_restrictions,cur_touched FROM cur WHERE cur_id={$rid}";
 260                                                         $res = wfQuery( $sql, DB_READ, $fname );
 261
 262                                                         if ( 0 != wfNumRows( $res ) ) {
 263                                                                 $this->mRedirectedFrom = $this->mTitle->getPrefixedText();
 264                                                                 $this->mTitle = $rt;
 265                                                                 $s = wfFetchObject( $res );
 266                                                         }
 267                                                 }
 268                                         }
 269                                 }
 270                         }
 271
 272                         $this->mContent = $s->cur_text;
 273                         $this->mUser = $s->cur_user;
 274                         $this->mCounter = $s->cur_counter;
 275                         $this->mTimestamp = $s->cur_timestamp;
 276                         $this->mTouched = $s->cur_touched;
 277                         $this->mTitle->mRestrictions = explode( ",", trim( $s->cur_restrictions ) );
 278                         $this->mTitle->mRestrictionsLoaded = true;
 279                         wfFreeResult( $res );
 280                 } else { # oldid set, retrieve historical version
 281                         $sql = "SELECT old_text,old_timestamp,old_user,old_flags FROM old " .
 282                           "WHERE old_id={$oldid}";
 283                         $res = wfQuery( $sql, DB_READ, $fname );
 284                         if ( 0 == wfNumRows( $res ) ) {
 285                                 return false;
 286                         }
 287
 288                         $s = wfFetchObject( $res );
 289                         $this->mContent = Article::getRevisionText( $s );
 290                         $this->mUser = $s->old_user;
 291                         $this->mCounter = 0;
 292                         $this->mTimestamp = $s->old_timestamp;
 293                         wfFreeResult( $res );
 294                 }
 295                 $this->mContentLoaded = true;
 296                 return $this->mContent;
 297         }
 298
 299         function getID() {
 300                 if( $this->mTitle ) {
 301                         return $this->mTitle->getArticleID();
 302                 } else {
 303                         return 0;
 304                 }
 305         }
 306
 307         function getCount()
 308         {
 309                 if ( -1 == $this->mCounter ) {
 310                         $id = $this->getID();
 311                         $this->mCounter = wfGetSQL( "cur", "cur_counter", "cur_id={$id}" );
 312                 }
 313                 return $this->mCounter;
 314         }
 315
 316         # Would the given text make this article a "good" article (i.e.,
 317         # suitable for including in the article count)?
 318
 319         function isCountable( $text )
 320         {
 321                 global $wgUseCommaCount, $wgMwRedir;
 322
 323                 if ( 0 != $this->mTitle->getNamespace() ) { return 0; }
 324                 if ( $wgMwRedir->matchStart( $text ) ) { return 0; }
 325                 $token = ($wgUseCommaCount ? "," : "[[" );
 326                 if ( false === strstr( $text, $token ) ) { return 0; }
 327                 return 1;
 328         }
 329
 330         # Loads everything from cur except cur_text
 331         # This isn't necessary for all uses, so it's only done if needed.
 332
 333         /* private */ function loadLastEdit()
 334         {
 335                 global $wgOut;
 336                 if ( -1 != $this->mUser ) return;
 337
 338                 $sql = "SELECT cur_user,cur_user_text,cur_timestamp," .
 339                   "cur_comment,cur_minor_edit FROM cur WHERE " .
 340                   "cur_id=" . $this->getID();
 341                 $res = wfQuery( $sql, DB_READ, "Article::loadLastEdit" );
 342
 343                 if ( wfNumRows( $res ) > 0 ) {
 344                         $s = wfFetchObject( $res );
 345                         $this->mUser = $s->cur_user;
 346                         $this->mUserText = $s->cur_user_text;
 347                         $this->mTimestamp = $s->cur_timestamp;
 348                         $this->mComment = $s->cur_comment;
 349                         $this->mMinorEdit = $s->cur_minor_edit;
 350                 }
 351         }
 352
 353         function getTimestamp()
 354         {
 355                 $this->loadLastEdit();
 356                 return $this->mTimestamp;
 357         }
 358
 359         function getUser()
 360         {
 361                 $this->loadLastEdit();
 362                 return $this->mUser;
 363         }
 364
 365         function getUserText()
 366         {
 367                 $this->loadLastEdit();
 368                 return $this->mUserText;
 369         }
 370
 371         function getComment()
 372         {
 373                 $this->loadLastEdit();
 374                 return $this->mComment;
 375         }
 376
 377         function getMinorEdit()
 378         {
 379                 $this->loadLastEdit();
 380                 return $this->mMinorEdit;
 381         }
 382
 383         # This is the default action of the script: just view the page of
 384         # the given title.
 385
 386         function view()
 387         {
 388                 global $wgUser, $wgOut, $wgLang, $wgRequest;
 389                 global $wgLinkCache, $IP, $wgEnableParserCache;
 390
 391                 $fname = "Article::view";
 392                 wfProfileIn( $fname );
 393
 394                 # Get variables from query string :P
 395                 $oldid = $wgRequest->getVal( 'oldid' );
 396                 $diff = $wgRequest->getVal( 'diff' );
 397
 398                 $wgOut->setArticleFlag( true );
 399                 $wgOut->setRobotpolicy( "index,follow" );
 400
 401                 # If we got diff and oldid in the query, we want to see a
 402                 # diff page instead of the article.
 403
 404                 if ( !is_null( $diff ) ) {
 405                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 406                         $de = new DifferenceEngine( intval($oldid), intval($diff) );
 407                         $de->showDiffPage();
 408                         wfProfileOut( $fname );
 409                         return;
 410                 }
 411
 412                 if ( !is_null( $oldid ) and $this->checkTouched() ) {
 413                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 414                                 return;
 415                         } else if ( $this->tryFileCache() ) {
 416                                 # tell wgOut that output is taken care of
 417                                 $wgOut->disable();
 418                                 $this->viewUpdates();
 419                                 return;
 420                         }
 421                 }
 422
 423                 $text = $this->getContent(); # May change mTitle
 424                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 425                 $wgOut->setHTMLTitle( $this->mTitle->getPrefixedText() .
 426                   " - " . wfMsg( "wikititlesuffix" ) );
 427
 428                 # We're looking at an old revision
 429
 430                 if ( !empty( $oldid ) ) {
 431                         $this->setOldSubtitle();
 432                         $wgOut->setRobotpolicy( "noindex,follow" );
 433                 }
 434                 if ( "" != $this->mRedirectedFrom ) {
 435                         $sk = $wgUser->getSkin();
 436                         $redir = $sk->makeKnownLink( $this->mRedirectedFrom, "",
 437                           "redirect=no" );
 438                         $s = wfMsg( "redirectedfrom", $redir );
 439                         $wgOut->setSubtitle( $s );
 440                 }
 441
 442                 $wgLinkCache->preFill( $this->mTitle );
 443
 444                 if( $wgEnableParserCache && intval($wgUser->getOption( "stubthreshold" )) == 0 ){
 445                         $wgOut->addWikiText( $text, true, $this );
 446                 } else {
 447                         $wgOut->addWikiText( $text );
 448                 }
 449
 450                 # Add link titles as META keywords
 451                 $wgOut->addMetaTags() ;
 452
 453                 $this->viewUpdates();
 454                 wfProfileOut( $fname );
 455         }
 456
 457         # Theoretically we could defer these whole insert and update
 458         # functions for after display, but that's taking a big leap
 459         # of faith, and we want to be able to report database
 460         # errors at some point.
 461
 462         /* private */ function insertNewArticle( $text, $summary, $isminor, $watchthis )
 463         {
 464                 global $wgOut, $wgUser, $wgLinkCache, $wgMwRedir;
 465                 global $wgUseSquid, $wgDeferredUpdateList, $wgInternalServer;
 466
 467                 $fname = "Article::insertNewArticle";
 468
 469                 $this->mCountAdjustment = $this->isCountable( $text );
 470
 471                 $ns = $this->mTitle->getNamespace();
 472                 $ttl = $this->mTitle->getDBkey();
 473                 $text = $this->preSaveTransform( $text );
 474                 if ( $wgMwRedir->matchStart( $text ) ) { $redir = 1; }
 475                 else { $redir = 0; }
 476
 477                 $now = wfTimestampNow();
 478                 $won = wfInvertTimestamp( $now );
 479                 wfSeedRandom();
 480                 $rand = number_format( mt_rand() / mt_getrandmax(), 12, ".", "" );
 481                 $isminor = ( $isminor && $wgUser->getID() ) ? 1 : 0;
 482                 $sql = "INSERT INTO cur (cur_namespace,cur_title,cur_text," .
 483                   "cur_comment,cur_user,cur_timestamp,cur_minor_edit,cur_counter," .
 484                   "cur_restrictions,cur_user_text,cur_is_redirect," .
 485                   "cur_is_new,cur_random,cur_touched,inverse_timestamp) VALUES ({$ns},'" . wfStrencode( $ttl ) . "', '" .
 486                   wfStrencode( $text ) . "', '" .
 487                   wfStrencode( $summary ) . "', '" .
 488                   $wgUser->getID() . "', '{$now}', " .
 489                   $isminor . ", 0, '', '" .
 490                   wfStrencode( $wgUser->getName() ) . "', $redir, 1, $rand, '{$now}', '{$won}')";
 491                 $res = wfQuery( $sql, DB_WRITE, $fname );
 492
 493                 $newid = wfInsertId();
 494                 $this->mTitle->resetArticleID( $newid );
 495
 496                 Article::onArticleCreate( $this->mTitle );
 497                 RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary );
 498
 499                 if ($watchthis) {
 500                         if(!$this->mTitle->userIsWatching()) $this->watch();
 501                 } else {
 502                         if ( $this->mTitle->userIsWatching() ) {
 503                                 $this->unwatch();
 504                         }
 505                 }
 506
 507                 # The talk page isn't in the regular link tables, so we need to update manually:
 508                 $talkns = $ns ^ 1; # talk -> normal; normal -> talk
 509                 $sql = "UPDATE cur set cur_touched='$now' WHERE cur_namespace=$talkns AND cur_title='" . wfStrencode( $ttl ) . "'";
 510                 wfQuery( $sql, DB_WRITE );
 511
 512                 # standard deferred updates
 513                 $this->editUpdates( $text );
 514
 515                 $this->showArticle( $text, wfMsg( "newarticle" ) );
 516         }
 517
 518
 519         /* Side effects: loads last edit */
 520         function getTextOfLastEditWithSectionReplacedOrAdded($section, $text, $summary = ""){
 521                 $this->loadLastEdit();
 522                 $oldtext = $this->getContent();
 523                 if ($section != "") {
 524                         if($section=="new") {
 525                                 if($summary) $subject="== {$summary} ==\n\n";
 526                                 $text=$oldtext."\n\n".$subject.$text;
 527                         } else {
 528                                 $secs=preg_split("/(^=+.*?=+|^<h[1-6].*?>.*?<\/h[1-6].*?>)/mi",
 529                                   $oldtext,-1,PREG_SPLIT_DELIM_CAPTURE);
 530                                 $secs[$section*2]=$text."\n\n"; // replace with edited
 531                                 if($section) { $secs[$section*2-1]=""; } // erase old headline
 532                                 $text=join("",$secs);
 533                         }
 534                 }
 535                 return $text;
 536         }
 537
 538         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false )
 539         {
 540                 global $wgOut, $wgUser, $wgLinkCache;
 541                 global $wgDBtransactions, $wgMwRedir;
 542                 global $wgUseSquid, $wgInternalServer;
 543                 $fname = "Article::updateArticle";
 544
 545                 if ( $this->mMinorEdit ) { $me1 = 1; } else { $me1 = 0; }
 546                 if ( $minor && $wgUser->getID() ) { $me2 = 1; } else { $me2 = 0; }
 547                 if ( preg_match( "/^((" . $wgMwRedir->getBaseRegex() . ")[^\\n]+)/i", $text, $m ) ) {
 548                         $redir = 1;
 549                         $text = $m[1] . "\n"; # Remove all content but redirect
 550                 }
 551                 else { $redir = 0; }
 552
 553                 $text = $this->preSaveTransform( $text );
 554
 555                 # Update article, but only if changed.
 556
 557                 if( $wgDBtransactions ) {
 558                         $sql = "BEGIN";
 559                         wfQuery( $sql, DB_WRITE );
 560                 }
 561                 $oldtext = $this->getContent( true );
 562
 563                 if ( 0 != strcmp( $text, $oldtext ) ) {
 564                         $this->mCountAdjustment = $this->isCountable( $text )
 565                           - $this->isCountable( $oldtext );
 566
 567                         $now = wfTimestampNow();
 568                         $won = wfInvertTimestamp( $now );
 569                         $sql = "UPDATE cur SET cur_text='" . wfStrencode( $text ) .
 570                           "',cur_comment='" .  wfStrencode( $summary ) .
 571                           "',cur_minor_edit={$me2}, cur_user=" . $wgUser->getID() .
 572                           ",cur_timestamp='{$now}',cur_user_text='" .
 573                           wfStrencode( $wgUser->getName() ) .
 574                           "',cur_is_redirect={$redir}, cur_is_new=0, cur_touched='{$now}', inverse_timestamp='{$won}' " .
 575                           "WHERE cur_id=" . $this->getID() .
 576                           " AND cur_timestamp='" . $this->getTimestamp() . "'";
 577                         $res = wfQuery( $sql, DB_WRITE, $fname );
 578
 579                         if( wfAffectedRows() == 0 ) {
 580                                 /* Belated edit conflict! Run away!! */
 581                                 return false;
 582                         }
 583
 584                         # This overwrites $oldtext if revision compression is on
 585                         $flags = Article::compressRevisionText( $oldtext );
 586
 587                         $sql = "INSERT INTO old (old_namespace,old_title,old_text," .
 588                           "old_comment,old_user,old_user_text,old_timestamp," .
 589                           "old_minor_edit,inverse_timestamp,old_flags) VALUES (" .
 590                           $this->mTitle->getNamespace() . ", '" .
 591                           wfStrencode( $this->mTitle->getDBkey() ) . "', '" .
 592                           wfStrencode( $oldtext ) . "', '" .
 593                           wfStrencode( $this->getComment() ) . "', " .
 594                           $this->getUser() . ", '" .
 595                           wfStrencode( $this->getUserText() ) . "', '" .
 596                           $this->getTimestamp() . "', " . $me1 . ", '" .
 597                           wfInvertTimestamp( $this->getTimestamp() ) . "','$flags')";
 598                         $res = wfQuery( $sql, DB_WRITE, $fname );
 599                         $oldid = wfInsertID( $res );
 600
 601                         $bot = (int)($wgUser->isBot() || $forceBot);
 602                         RecentChange::notifyEdit( $now, $this->mTitle, $me2, $wgUser, $summary,
 603                                 $oldid, $this->getTimestamp(), $bot );
 604                         Article::onArticleEdit( $this->mTitle );
 605                 }
 606
 607                 if( $wgDBtransactions ) {
 608                         $sql = "COMMIT";
 609                         wfQuery( $sql, DB_WRITE );
 610                 }
 611
 612                 if ($watchthis) {
 613                         if (!$this->mTitle->userIsWatching()) $this->watch();
 614                 } else {
 615                         if ( $this->mTitle->userIsWatching() ) {
 616                                 $this->unwatch();
 617                         }
 618                 }
 619                 # standard deferred updates
 620                 $this->editUpdates( $text );
 621
 622
 623                 $urls = array();
 624                 # Template namespace
 625                 # Purge all articles linking here
 626                 if ( $this->mTitle->getNamespace() == NS_TEMPLATE) {
 627                         $titles = $this->mTitle->getLinksTo();
 628                         Title::touchArray( $titles );
 629                         if ( $wgUseSquid ) {
 630                                 foreach ( $titles as $title ) {
 631                                         $urls[] = $title->getInternalURL();
 632                                 }
 633                         }
 634                 }
 635
 636                 # Squid updates
 637                 if ( $wgUseSquid ) {
 638                         $urls = array_merge( $urls, $this->mTitle->getSquidURLs() );
 639                         $u = new SquidUpdate( $urls );
 640                         $u->doUpdate();
 641                 }
 642
 643                 $this->showArticle( $text, wfMsg( "updated" ) );
 644                 return true;
 645         }
 646
 647         # After we've either updated or inserted the article, update
 648         # the link tables and redirect to the new page.
 649
 650         function showArticle( $text, $subtitle )
 651         {
 652                 global $wgOut, $wgUser, $wgLinkCache;
 653                 global $wgMwRedir;
 654
 655                 $wgLinkCache = new LinkCache();
 656
 657                 # Get old version of link table to allow incremental link updates
 658                 $wgLinkCache->preFill( $this->mTitle );
 659                 $wgLinkCache->clear();
 660
 661                 # Now update the link cache by parsing the text
 662                 $wgOut = new OutputPage();
 663                 $wgOut->addWikiText( $text );
 664
 665                 if( $wgMwRedir->matchStart( $text ) )
 666                         $r = "redirect=no";
 667                 else
 668                         $r = "";
 669                 $wgOut->redirect( $this->mTitle->getFullURL( $r ) );
 670         }
 671
 672         # Add this page to my watchlist
 673
 674         function watch( $add = true )
 675         {
 676                 global $wgUser, $wgOut, $wgLang;
 677                 global $wgDeferredUpdateList;
 678
 679                 if ( 0 == $wgUser->getID() ) {
 680                         $wgOut->errorpage( "watchnologin", "watchnologintext" );
 681                         return;
 682                 }
 683                 if ( wfReadOnly() ) {
 684                         $wgOut->readOnlyPage();
 685                         return;
 686                 }
 687                 if( $add )
 688                         $wgUser->addWatch( $this->mTitle );
 689                 else
 690                         $wgUser->removeWatch( $this->mTitle );
 691
 692                 $wgOut->setPagetitle( wfMsg( $add ? "addedwatch" : "removedwatch" ) );
 693                 $wgOut->setRobotpolicy( "noindex,follow" );
 694
 695                 $sk = $wgUser->getSkin() ;
 696                 $link = $sk->makeKnownLink ( $this->mTitle->getPrefixedText() ) ;
 697
 698                 if($add)
 699                         $text = wfMsg( "addedwatchtext", $link );
 700                 else
 701                         $text = wfMsg( "removedwatchtext", $link );
 702                 $wgOut->addHTML( $text );
 703
 704                 $up = new UserUpdate();
 705                 array_push( $wgDeferredUpdateList, $up );
 706
 707                 $wgOut->returnToMain( false );
 708         }
 709
 710         function unwatch()
 711         {
 712                 $this->watch( false );
 713         }
 714
 715         function protect( $limit = "sysop" )
 716         {
 717                 global $wgUser, $wgOut;
 718
 719                 if ( ! $wgUser->isSysop() ) {
 720                         $wgOut->sysopRequired();
 721                         return;
 722                 }
 723                 if ( wfReadOnly() ) {
 724                         $wgOut->readOnlyPage();
 725                         return;
 726                 }
 727                 $id = $this->mTitle->getArticleID();
 728                 if ( 0 == $id ) {
 729                         $wgOut->fatalEror( wfMsg( "badarticleerror" ) );
 730                         return;
 731                 }
 732         $sql = "UPDATE cur SET cur_touched='" . wfTimestampNow() . "'," .
 733                         "cur_restrictions='{$limit}' WHERE cur_id={$id}";
 734                 wfQuery( $sql, DB_WRITE, "Article::protect" );
 735
 736                 $log = new LogPage( wfMsg( "protectlogpage" ), wfMsg( "protectlogtext" ) );
 737                 if ( $limit === "" ) {
 738                         $log->addEntry( wfMsg( "unprotectedarticle", $this->mTitle->getPrefixedText() ), "" );
 739                 } else {
 740                         $log->addEntry( wfMsg( "protectedarticle", $this->mTitle->getPrefixedText() ), "" );
 741                 }
 742                 $wgOut->redirect( $this->mTitle->getFullURL() );
 743         }
 744
 745         function unprotect()
 746         {
 747                 return $this->protect( "" );
 748         }
 749
 750         # UI entry point for page deletion
 751         function delete()
 752         {
 753                 global $wgUser, $wgOut, $wgMessageCache, $wgRequest;
 754                 $fname = "Article::delete";
 755                 $confirm = $wgRequest->getBool( 'wpConfirm' ) && $wgRequest->isPosted();
 756                 $reason = $wgRequest->getText( 'wpReason' );
 757
 758                 # This code desperately needs to be totally rewritten
 759
 760                 # Check permissions
 761                 if ( ( ! $wgUser->isSysop() ) ) {
 762                         $wgOut->sysopRequired();
 763                         return;
 764                 }
 765                 if ( wfReadOnly() ) {
 766                         $wgOut->readOnlyPage();
 767                         return;
 768                 }
 769
 770                 # Better double-check that it hasn't been deleted yet!
 771                 $wgOut->setPagetitle( wfMsg( "confirmdelete" ) );
 772                 if ( ( "" == trim( $this->mTitle->getText() ) )
 773                   or ( $this->mTitle->getArticleId() == 0 ) ) {
 774                         $wgOut->fatalError( wfMsg( "cannotdelete" ) );
 775                         return;
 776                 }
 777
 778                 if ( $confirm ) {
 779                         $this->doDelete( $reason );
 780                         return;
 781                 }
 782
 783                 # determine whether this page has earlier revisions
 784                 # and insert a warning if it does
 785                 # we select the text because it might be useful below
 786                 $ns = $this->mTitle->getNamespace();
 787                 $title = $this->mTitle->getDBkey();
 788                 $etitle = wfStrencode( $title );
 789                 $sql = "SELECT old_text,old_flags FROM old WHERE old_namespace=$ns and old_title='$etitle' ORDER BY inverse_timestamp LIMIT 1";
 790                 $res = wfQuery( $sql, DB_READ, $fname );
 791                 if( ($old=wfFetchObject($res)) && !$confirm ) {
 792                         $skin=$wgUser->getSkin();
 793                         $wgOut->addHTML("<B>".wfMsg("historywarning"));
 794                         $wgOut->addHTML( $skin->historyLink() ."</B><P>");
 795                 }
 796
 797                 $sql="SELECT cur_text FROM cur WHERE cur_namespace=$ns and cur_title='$etitle'";
 798                 $res=wfQuery($sql, DB_READ, $fname);
 799                 if( ($s=wfFetchObject($res))) {
 800
 801                         # if this is a mini-text, we can paste part of it into the deletion reason
 802
 803                         #if this is empty, an earlier revision may contain "useful" text
 804                         $blanked = false;
 805                         if($s->cur_text!="") {
 806                                 $text=$s->cur_text;
 807                         } else {
 808                                 if($old) {
 809                                         $text = Article::getRevisionText( $old );
 810                                         $blanked = true;
 811                                 }
 812
 813                         }
 814
 815                         $length=strlen($text);
 816
 817                         # this should not happen, since it is not possible to store an empty, new
 818                         # page. Let's insert a standard text in case it does, though
 819                         if($length == 0 && $reason === "") {
 820                                 $reason = wfMsg("exblank");
 821                         }
 822
 823                         if($length < 500 && $reason === "") {
 824
 825                                 # comment field=255, let's grep the first 150 to have some user
 826                                 # space left
 827                                 $text=substr($text,0,150);
 828                                 # let's strip out newlines and HTML tags
 829                                 $text=preg_replace("/\"/","'",$text);
 830                                 $text=preg_replace("/\</","&lt;",$text);
 831                                 $text=preg_replace("/\>/","&gt;",$text);
 832                                 $text=preg_replace("/[\n\r]/","",$text);
 833                                 if(!$blanked) {
 834                                         $reason=wfMsg("excontent"). " '".$text;
 835                                 } else {
 836                                         $reason=wfMsg("exbeforeblank") . " '".$text;
 837                                 }
 838                                 if($length>150) { $reason .= "..."; } # we've only pasted part of the text
 839                                 $reason.="'";
 840                         }
 841                 }
 842
 843                 return $this->confirmDelete( "", $reason );
 844         }
 845
 846         # Output deletion confirmation dialog
 847         function confirmDelete( $par, $reason )
 848         {
 849                 global $wgOut;
 850
 851                 wfDebug( "Article::confirmDelete\n" );
 852
 853                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
 854                 $wgOut->setSubtitle( wfMsg( "deletesub", $sub ) );
 855                 $wgOut->setRobotpolicy( "noindex,nofollow" );
 856                 $wgOut->addWikiText( wfMsg( "confirmdeletetext" ) );
 857
 858                 $formaction = $this->mTitle->escapeLocalURL( "action=delete" . $par );
 859
 860                 $confirm = wfMsg( "confirm" );
 861                 $check = wfMsg( "confirmcheck" );
 862                 $delcom = wfMsg( "deletecomment" );
 863
 864                 $wgOut->addHTML( "
 865 <form id=\"deleteconfirm\" method=\"post\" action=\"{$formaction}\">
 866 <table border=0><tr><td align=right>
 867 {$delcom}:</td><td align=left>
 868 <input type=text size=60 name=\"wpReason\" value=\"" . htmlspecialchars( $reason ) . "\">
 869 </td></tr><tr><td>&nbsp;</td></tr>
 870 <tr><td align=right>
 871 <input type=checkbox name=\"wpConfirm\" value='1' id=\"wpConfirm\">
 872 </td><td><label for=\"wpConfirm\">{$check}</label></td>
 873 </tr><tr><td>&nbsp;</td><td>
 874 <input type=submit name=\"wpConfirmB\" value=\"{$confirm}\">
 875 </td></tr></table></form>\n" );
 876
 877                 $wgOut->returnToMain( false );
 878         }
 879
 880         # Perform a deletion and output success or failure messages
 881         function doDelete( $reason )
 882         {
 883                 global $wgOut, $wgUser, $wgLang;
 884                 $fname = "Article::doDelete";
 885                 wfDebug( "$fname\n" );
 886
 887                 if ( $this->doDeleteArticle() ) {
 888                         $deleted = $this->mTitle->getPrefixedText();
 889
 890                         $wgOut->setPagetitle( wfMsg( "actioncomplete" ) );
 891                         $wgOut->setRobotpolicy( "noindex,nofollow" );
 892
 893                         $sk = $wgUser->getSkin();
 894                         $loglink = $sk->makeKnownLink( $wgLang->getNsText(
 895                           Namespace::getWikipedia() ) .
 896                           ":" . wfMsg( "dellogpage" ), wfMsg( "deletionlog" ) );
 897
 898                         $text = wfMsg( "deletedtext", $deleted, $loglink );
 899
 900                         $wgOut->addHTML( "<p>" . $text );
 901                         $wgOut->returnToMain( false );
 902                 } else {
 903                         $wgOut->fatalError( wfMsg( "cannotdelete" ) );
 904                 }
 905         }
 906
 907         # Back-end article deletion
 908         # Deletes the article with database consistency, writes logs, purges caches
 909         # Returns success
 910         function doDeleteArticle( $reason )
 911         {
 912                 global $wgUser, $wgLang;
 913                 global  $wgUseSquid, $wgDeferredUpdateList, $wgInternalServer;
 914
 915                 $fname = "Article::doDeleteArticle";
 916                 wfDebug( "$fname\n" );
 917
 918                 $ns = $this->mTitle->getNamespace();
 919                 $t = wfStrencode( $this->mTitle->getDBkey() );
 920                 $id = $this->mTitle->getArticleID();
 921
 922                 if ( "" == $t || $id == 0 ) {
 923                         return false;
 924                 }
 925
 926                 $u = new SiteStatsUpdate( 0, 1, -$this->isCountable( $this->getContent( true ) ) );
 927                 array_push( $wgDeferredUpdateList, $u );
 928
 929                 $linksTo = $this->mTitle->getLinksTo();
 930
 931                 # Squid purging
 932                 if ( $wgUseSquid ) {
 933                         $urls = array(
 934                                 $this->mTitle->getInternalURL(),
 935                                 $this->mTitle->getInternalURL( "history" )
 936                         );
 937                         foreach ( $linksTo as $linkTo ) {
 938                                 $urls[] = $linkTo->getInternalURL();
 939                         }
 940
 941                         $u = new SquidUpdate( $urls );
 942                         array_push( $wgDeferredUpdateList, $u );
 943
 944                 }
 945
 946                 # Client and file cache invalidation
 947                 Title::touchArray( $linksTo );
 948
 949                 # Move article and history to the "archive" table
 950                 $sql = "INSERT INTO archive (ar_namespace,ar_title,ar_text," .
 951                   "ar_comment,ar_user,ar_user_text,ar_timestamp,ar_minor_edit," .
 952                   "ar_flags) SELECT cur_namespace,cur_title,cur_text,cur_comment," .
 953                   "cur_user,cur_user_text,cur_timestamp,cur_minor_edit,0 FROM cur " .
 954                   "WHERE cur_namespace={$ns} AND cur_title='{$t}'";
 955                 wfQuery( $sql, DB_WRITE, $fname );
 956
 957                 $sql = "INSERT INTO archive (ar_namespace,ar_title,ar_text," .
 958                   "ar_comment,ar_user,ar_user_text,ar_timestamp,ar_minor_edit," .
 959                   "ar_flags) SELECT old_namespace,old_title,old_text,old_comment," .
 960                   "old_user,old_user_text,old_timestamp,old_minor_edit,old_flags " .
 961                   "FROM old WHERE old_namespace={$ns} AND old_title='{$t}'";
 962                 wfQuery( $sql, DB_WRITE, $fname );
 963
 964                 # Now that it's safely backed up, delete it
 965
 966                 $sql = "DELETE FROM cur WHERE cur_namespace={$ns} AND " .
 967                   "cur_title='{$t}'";
 968                 wfQuery( $sql, DB_WRITE, $fname );
 969
 970                 $sql = "DELETE FROM old WHERE old_namespace={$ns} AND " .
 971                   "old_title='{$t}'";
 972                 wfQuery( $sql, DB_WRITE, $fname );
 973
 974                 $sql = "DELETE FROM recentchanges WHERE rc_namespace={$ns} AND " .
 975                   "rc_title='{$t}'";
 976                 wfQuery( $sql, DB_WRITE, $fname );
 977
 978                 # Finally, clean up the link tables
 979                 $t = wfStrencode( $this->mTitle->getPrefixedDBkey() );
 980
 981                 Article::onArticleDelete( $this->mTitle );
 982
 983                 $sql = "INSERT INTO brokenlinks (bl_from,bl_to) VALUES ";
 984                 $first = true;
 985
 986                 foreach ( $linksTo as $titleObj ) {
 987                         if ( ! $first ) { $sql .= ","; }
 988                         $first = false;
 989                         # Get article ID. Efficient because it was loaded into the cache by getLinksTo().
 990                         $linkID = $titleObj->getArticleID();
 991                         $sql .= "({$linkID},'{$t}')";
 992                 }
 993                 if ( ! $first ) {
 994                         wfQuery( $sql, DB_WRITE, $fname );
 995                 }
 996
 997                 $sql = "DELETE FROM links WHERE l_to={$id}";
 998                 wfQuery( $sql, DB_WRITE, $fname );
 999
1000                 $sql = "DELETE FROM links WHERE l_from={$id}";
1001                 wfQuery( $sql, DB_WRITE, $fname );
1002
1003                 $sql = "DELETE FROM imagelinks WHERE il_from={$id}";
1004                 wfQuery( $sql, DB_WRITE, $fname );
1005
1006                 $sql = "DELETE FROM brokenlinks WHERE bl_from={$id}";
1007                 wfQuery( $sql, DB_WRITE, $fname );
1008
1009                 $log = new LogPage( wfMsg( "dellogpage" ), wfMsg( "dellogpagetext" ) );
1010                 $art = $this->mTitle->getPrefixedText();
1011                 $log->addEntry( wfMsg( "deletedarticle", $art ), $reason );
1012
1013                 # Clear the cached article id so the interface doesn't act like we exist
1014                 $this->mTitle->resetArticleID( 0 );
1015                 $this->mTitle->mArticleID = 0;
1016                 return true;
1017         }
1018
1019         function rollback()
1020         {
1021                 global $wgUser, $wgLang, $wgOut, $wgRequest;
1022
1023                 if ( ! $wgUser->isSysop() ) {
1024                         $wgOut->sysopRequired();
1025                         return;
1026                 }
1027                 if ( wfReadOnly() ) {
1028                         $wgOut->readOnlyPage( $this->getContent() );
1029                         return;
1030                 }
1031
1032                 # Enhanced rollback, marks edits rc_bot=1
1033                 $bot = $wgRequest->getBool( 'bot' );
1034
1035                 # Replace all this user's current edits with the next one down
1036                 $tt = wfStrencode( $this->mTitle->getDBKey() );
1037                 $n = $this->mTitle->getNamespace();
1038
1039                 # Get the last editor
1040                 $sql = "SELECT cur_id,cur_user,cur_user_text,cur_comment FROM cur WHERE cur_title='{$tt}' AND cur_namespace={$n}";
1041                 $res = wfQuery( $sql, DB_READ );
1042                 if( ($x = wfNumRows( $res )) != 1 ) {
1043                         # Something wrong
1044                         $wgOut->addHTML( wfMsg( "notanarticle" ) );
1045                         return;
1046                 }
1047                 $s = wfFetchObject( $res );
1048                 $ut = wfStrencode( $s->cur_user_text );
1049                 $uid = $s->cur_user;
1050                 $pid = $s->cur_id;
1051
1052                 $from = str_replace( '_', ' ', $wgRequest->getVal( "from" ) );
1053                 if( $from != $s->cur_user_text ) {
1054                         $wgOut->setPageTitle(wfmsg("rollbackfailed"));
1055                         $wgOut->addWikiText( wfMsg( "alreadyrolled",
1056                                 htmlspecialchars( $this->mTitle->getPrefixedText()),
1057                                 htmlspecialchars( $from ),
1058                                 htmlspecialchars( $s->cur_user_text ) ) );
1059                         if($s->cur_comment != "") {
1060                                 $wgOut->addHTML(
1061                                         wfMsg("editcomment",
1062                                         htmlspecialchars( $s->cur_comment ) ) );
1063                         }
1064                         return;
1065                 }
1066
1067                 # Get the last edit not by this guy
1068                 $sql = "SELECT old_text,old_user,old_user_text,old_timestamp,old_flags
1069                 FROM old USE INDEX (name_title_timestamp)
1070                 WHERE old_namespace={$n} AND old_title='{$tt}'
1071                 AND (old_user <> {$uid} OR old_user_text <> '{$ut}')
1072                 ORDER BY inverse_timestamp LIMIT 1";
1073                 $res = wfQuery( $sql, DB_READ );
1074                 if( wfNumRows( $res ) != 1 ) {
1075                         # Something wrong
1076                         $wgOut->setPageTitle(wfMsg("rollbackfailed"));
1077                         $wgOut->addHTML( wfMsg( "cantrollback" ) );
1078                         return;
1079                 }
1080                 $s = wfFetchObject( $res );
1081
1082                 if ( $bot ) {
1083                         # Mark all reverted edits as bot
1084                         $sql = "UPDATE recentchanges SET rc_bot=1 WHERE
1085                                 rc_cur_id=$pid AND rc_user=$uid AND rc_timestamp > '{$s->old_timestamp}'";
1086                         wfQuery( $sql, DB_WRITE, $fname );
1087                 }
1088
1089                 # Save it!
1090                 $newcomment = wfMsg( "revertpage", $s->old_user_text, $from );
1091                 $wgOut->setPagetitle( wfMsg( "actioncomplete" ) );
1092                 $wgOut->setRobotpolicy( "noindex,nofollow" );
1093                 $wgOut->addHTML( "<h2>" . $newcomment . "</h2>\n<hr>\n" );
1094                 $this->updateArticle( Article::getRevisionText( $s ), $newcomment, 1, $this->mTitle->userIsWatching(), $bot );
1095                 Article::onArticleEdit( $this->mTitle );
1096                 $wgOut->returnToMain( false );
1097         }
1098
1099
1100         # Do standard deferred updates after page view
1101
1102         /* private */ function viewUpdates()
1103         {
1104                 global $wgDeferredUpdateList;
1105                 if ( 0 != $this->getID() ) {
1106                         global $wgDisableCounters;
1107                         if( !$wgDisableCounters ) {
1108                                 Article::incViewCount( $this->getID() );
1109                                 $u = new SiteStatsUpdate( 1, 0, 0 );
1110                                 array_push( $wgDeferredUpdateList, $u );
1111                         }
1112                         $u = new UserTalkUpdate( 0, $this->mTitle->getNamespace(),
1113                           $this->mTitle->getDBkey() );
1114                         array_push( $wgDeferredUpdateList, $u );
1115                 }
1116         }
1117
1118         # Do standard deferred updates after page edit.
1119         # Every 1000th edit, prune the recent changes table.
1120
1121         /* private */ function editUpdates( $text )
1122         {
1123                 global $wgDeferredUpdateList, $wgDBname, $wgMemc;
1124                 global $wgMessageCache;
1125
1126                 wfSeedRandom();
1127                 if ( 0 == mt_rand( 0, 999 ) ) {
1128                         $cutoff = wfUnix2Timestamp( time() - ( 7 * 86400 ) );
1129                         $sql = "DELETE FROM recentchanges WHERE rc_timestamp < '{$cutoff}'";
1130                         wfQuery( $sql, DB_WRITE );
1131                 }
1132                 $id = $this->getID();
1133                 $title = $this->mTitle->getPrefixedDBkey();
1134                 $shortTitle = $this->mTitle->getDBkey();
1135
1136                 $adj = $this->mCountAdjustment;
1137
1138                 if ( 0 != $id ) {
1139                         $u = new LinksUpdate( $id, $title );
1140                         array_push( $wgDeferredUpdateList, $u );
1141                         $u = new SiteStatsUpdate( 0, 1, $adj );
1142                         array_push( $wgDeferredUpdateList, $u );
1143                         $u = new SearchUpdate( $id, $title, $text );
1144                         array_push( $wgDeferredUpdateList, $u );
1145
1146                         $u = new UserTalkUpdate( 1, $this->mTitle->getNamespace(), $shortTitle );
1147                         array_push( $wgDeferredUpdateList, $u );
1148
1149                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1150                                 $wgMessageCache->replace( $shortTitle, $text );
1151                         }
1152                 }
1153         }
1154
1155         /* private */ function setOldSubtitle()
1156         {
1157                 global $wgLang, $wgOut;
1158
1159                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
1160                 $r = wfMsg( "revisionasof", $td );
1161                 $wgOut->setSubtitle( "({$r})" );
1162         }
1163
1164         # This function is called right before saving the wikitext,
1165         # so we can do things like signatures and links-in-context.
1166
1167         function preSaveTransform( $text )
1168         {
1169                 global $wgParser, $wgUser;
1170                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
1171         }
1172
1173         /* Caching functions */
1174
1175         # checkLastModified returns true if it has taken care of all
1176         # output to the client that is necessary for this request.
1177         # (that is, it has sent a cached version of the page)
1178         function tryFileCache() {
1179                 static $called = false;
1180                 if( $called ) {
1181                         wfDebug( " tryFileCache() -- called twice!?\n" );
1182                         return;
1183                 }
1184                 $called = true;
1185                 if($this->isFileCacheable()) {
1186                         $touched = $this->mTouched;
1187                         if( $this->mTitle->getPrefixedDBkey() == wfMsg( "mainpage" ) ) {
1188                                 # Expire the main page quicker
1189                                 $expire = wfUnix2Timestamp( time() - 3600 );
1190                                 $touched = max( $expire, $touched );
1191                         }
1192                         $cache = new CacheManager( $this->mTitle );
1193                         if($cache->isFileCacheGood( $touched )) {
1194                                 global $wgOut;
1195                                 wfDebug( " tryFileCache() - about to load\n" );
1196                                 $cache->loadFromFileCache();
1197                                 return true;
1198                         } else {
1199                                 wfDebug( " tryFileCache() - starting buffer\n" );
1200                                 ob_start( array(&$cache, 'saveToFileCache' ) );
1201                         }
1202                 } else {
1203                         wfDebug( " tryFileCache() - not cacheable\n" );
1204                 }
1205         }
1206
1207         function isFileCacheable() {
1208                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest;
1209                 extract( $wgRequest->getValues( 'action', 'oldid', 'diff', 'redirect', 'printable' ) );
1210
1211                 return $wgUseFileCache
1212                         and (!$wgShowIPinHeader)
1213                         and ($this->getID() != 0)
1214                         and ($wgUser->getId() == 0)
1215                         and (!$wgUser->getNewtalk())
1216                         and ($this->mTitle->getNamespace() != Namespace::getSpecial())
1217                         and ($action == "view")
1218                         and (!isset($oldid))
1219                         and (!isset($diff))
1220                         and (!isset($redirect))
1221                         and (!isset($printable))
1222                         and (!$this->mRedirectedFrom);
1223         }
1224
1225         function checkTouched() {
1226                 $id = $this->getID();
1227                 $sql = "SELECT cur_touched,cur_is_redirect FROM cur WHERE cur_id=$id";
1228                 $res = wfQuery( $sql, DB_READ, "Article::checkTouched" );
1229                 if( $s = wfFetchObject( $res ) ) {
1230                         $this->mTouched = $s->cur_touched;
1231                         return !$s->cur_is_redirect;
1232                 } else {
1233                         return false;
1234                 }
1235         }
1236
1237         /* static */ function incViewCount( $id )
1238         {
1239                 $id = intval( $id );
1240                 global $wgHitcounterUpdateFreq;
1241
1242                 if( $wgHitcounterUpdateFreq <= 1 ){ //
1243                         wfQuery("UPDATE cur SET cur_counter = cur_counter + 1 " .
1244                                 "WHERE cur_id = $id", DB_WRITE);
1245                         return;
1246                 }
1247
1248                 # Not important enough to warrant an error page in case of failure
1249                 $oldignore = wfIgnoreSQLErrors( true );
1250
1251                 wfQuery("INSERT INTO hitcounter (hc_id) VALUES ({$id})", DB_WRITE);
1252
1253                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
1254                 if( (rand() % $checkfreq != 0) or (wfLastErrno() != 0) ){
1255                         # Most of the time (or on SQL errors), skip row count check
1256                         wfIgnoreSQLErrors( $oldignore );
1257                         return;
1258                 }
1259
1260                 $res = wfQuery("SELECT COUNT(*) as n FROM hitcounter", DB_WRITE);
1261                 $row = wfFetchObject( $res );
1262                 $rown = intval( $row->n );
1263                 if( $rown >= $wgHitcounterUpdateFreq ){
1264                         wfProfileIn( "Article::incViewCount-collect" );
1265                         $old_user_abort = ignore_user_abort( true );
1266
1267                         wfQuery("LOCK TABLES hitcounter WRITE", DB_WRITE);
1268                         wfQuery("CREATE TEMPORARY TABLE acchits TYPE=HEAP ".
1269                                 "SELECT hc_id,COUNT(*) AS hc_n FROM hitcounter ".
1270                                 "GROUP BY hc_id", DB_WRITE);
1271                         wfQuery("DELETE FROM hitcounter", DB_WRITE);
1272                         wfQuery("UNLOCK TABLES", DB_WRITE);
1273                         wfQuery("UPDATE cur,acchits SET cur_counter=cur_counter + hc_n ".
1274                                 "WHERE cur_id = hc_id", DB_WRITE);
1275                         wfQuery("DROP TABLE acchits", DB_WRITE);
1276
1277                         ignore_user_abort( $old_user_abort );
1278                         wfProfileOut( "Article::incViewCount-collect" );
1279                 }
1280                 wfIgnoreSQLErrors( $oldignore );
1281         }
1282
1283         # The onArticle*() functions are supposed to be a kind of hooks
1284         # which should be called whenever any of the specified actions
1285         # are done.
1286         #
1287         # This is a good place to put code to clear caches, for instance.
1288
1289         # This is called on page move and undelete, as well as edit
1290         /* static */ function onArticleCreate($title_obj){
1291                 global $wgEnablePersistentLC, $wgEnableParserCache, $wgUseSquid, $wgDeferredUpdateList;
1292
1293                 $titles = $title_obj->getBrokenLinksTo();
1294
1295                 # Purge squid
1296                 if ( $wgUseSquid ) {
1297                         $urls = $title_obj->getSquidURLs();
1298                         foreach ( $titles as $linkTitle ) {
1299                                 $urls[] = $linkTitle->getInternalURL();
1300                         }
1301                         $u = new SquidUpdate( $urls );
1302                         array_push( $wgDeferredUpdateList, $u );
1303                 }
1304
1305                 # Clear persistent link cache
1306                 if ( $wgEnablePersistentLC ) {
1307                         LinkCache::linksccClearBrokenLinksTo( $title_obj->getPrefixedDBkey() );
1308                 }
1309
1310                 # Clear parser cache (not really used)
1311                 if ( $wgEnableParserCache ) {
1312                         OutputPage::parsercacheClearBrokenLinksTo( $title_obj->getPrefixedDBkey() );
1313                 }
1314         }
1315
1316         /* static */ function onArticleDelete($title_obj){
1317                 global $wgEnablePersistentLC, $wgEnableParserCache;
1318                 if ( $wgEnablePersistentLC ) {
1319                         LinkCache::linksccClearLinksTo( $title_obj->getArticleID() );
1320                 }
1321                 if ( $wgEnableParserCache ) {
1322                         OutputPage::parsercacheClearLinksTo( $title_obj->getArticleID() );
1323                 }
1324         }
1325
1326         /* static */ function onArticleEdit($title_obj){
1327                 global $wgEnablePersistentLC, $wgEnableParserCache;
1328                 if ( $wgEnablePersistentLC ) {
1329                         LinkCache::linksccClearPage( $title_obj->getArticleID() );
1330                 }
1331                 if ( $wgEnableParserCache ) {
1332                         OutputPage::parsercacheClearPage( $title_obj->getArticleID(), $title_obj->getNamespace() );
1333                 }
1334         }
1335 }
1336
1337 ?>