includes/Article.php

   1 <?
   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 /* CHECK MERGE @@@
   9    TEST THIS @@@
  10
  11    * s/\$wgTitle/\$this->mTitle/ performed, many replacements
  12    * mTitle variable added to class
  13 */
  14
  15 include_once( "CacheManager.php" );
  16
  17 class Article {
  18         /* private */ var $mContent, $mContentLoaded;
  19         /* private */ var $mUser, $mTimestamp, $mUserText;
  20         /* private */ var $mCounter, $mComment, $mCountAdjustment;
  21         /* private */ var $mMinorEdit, $mRedirectedFrom;
  22         /* private */ var $mTouched, $mFileCache, $mTitle;
  23         /* private */ var $mId, $mTable;
  24
  25         function Article( &$title ) {
  26                 $this->mTitle =& $title;
  27                 $this->clear();
  28         }
  29
  30         /* private */ function clear()
  31         {
  32                 $this->mContentLoaded = false;
  33                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
  34                 $this->mRedirectedFrom = $this->mUserText =
  35                 $this->mTimestamp = $this->mComment = $this->mFileCache = "";
  36                 $this->mCountAdjustment = 0;
  37                 $this->mTouched = "19700101000000";
  38         }
  39
  40         /* static */ function getRevisionText( $row, $prefix = "old_" ) {
  41                 # Deal with optional compression of archived pages.
  42                 # This can be done periodically via maintenance/compressOld.php, and
  43                 # as pages are saved if $wgCompressRevisions is set.
  44                 $text = $prefix . "text";
  45                 $flags = $prefix . "flags";
  46                 if( isset( $row->$flags ) && (false !== strpos( $row->$flags, "gzip" ) ) ) {
  47                         return gzinflate( $row->$text );
  48                 }
  49                 if( isset( $row->$text ) ) {
  50                         return $row->$text;
  51                 }
  52                 return false;
  53         }
  54
  55         /* static */ function compressRevisionText( &$text ) {
  56                 global $wgCompressRevisions;
  57                 if( !$wgCompressRevisions ) {
  58                         return "";
  59                 }
  60                 if( !function_exists( "gzdeflate" ) ) {
  61                         wfDebug( "Article::compressRevisionText() -- no zlib support, not compressing\n" );
  62                         return "";
  63                 }
  64                 $text = gzdeflate( $text );
  65                 return "gzip";
  66         }
  67
  68         # Note that getContent/loadContent may follow redirects if
  69         # not told otherwise, and so may cause a change to mTitle.
  70
  71         # Return the text of this revision
  72         function getContent( $noredir = false )
  73         {
  74                 global $action,$section,$count; # From query string
  75                 $fname =  "Article::getContent";
  76                 wfProfileIn( $fname );
  77
  78                 if ( 0 == $this->getID() ) {
  79                         if ( "edit" == $action ) {
  80                                 wfProfileOut( $fname );
  81                                 return ""; # was "newarticletext", now moved above the box)
  82                         }
  83                         wfProfileOut( $fname );
  84                         return wfMsg( "noarticletext" );
  85                 } else {
  86                         $this->loadContent( $noredir );
  87
  88                         if(
  89                                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
  90                                 ( $this->mTitle->getNamespace() == Namespace::getTalk( Namespace::getUser()) ) &&
  91                                   preg_match("/^\d{1,3}\.\d{1,3}.\d{1,3}\.\d{1,3}$/",$this->mTitle->getText()) &&
  92                                   $action=="view"
  93                                 )
  94                                 {
  95                                 wfProfileOut( $fname );
  96                                 return $this->mContent . "\n" .wfMsg("anontalkpagetext"); }
  97                         else {
  98                                 if($action=="edit") {
  99                                         if($section!="") {
 100                                                 if($section=="new") {
 101                                                         wfProfileOut( $fname );
 102                                                         return "";
 103                                                 }
 104
 105                                                 $secs=preg_split("/(^=+.*?=+|^<h[1-6].*?>.*?<\/h[1-6].*?>)/mi",
 106                                                  $this->mContent, -1,
 107                                                  PREG_SPLIT_DELIM_CAPTURE);
 108                                                 if($section==0) {
 109                                                         wfProfileOut( $fname );
 110                                                         return trim($secs[0]);
 111                                                 } else {
 112                                                         wfProfileOut( $fname );
 113                                                         return trim($secs[$section*2-1] . $secs[$section*2]);
 114                                                 }
 115                                         }
 116                                 }
 117                                 wfProfileOut( $fname );
 118                                 return $this->mContent;
 119                         }
 120                 }
 121         }
 122
 123         # Load the revision (including cur_text) into this object
 124         function loadContent( $noredir = false )
 125         {
 126                 global $wgOut, $wgMwRedir;
 127                 global $oldid, $redirect; # From query
 128
 129                 if ( $this->mContentLoaded ) return;
 130                 $fname = "Article::loadContent";
 131                 $success = true;
 132
 133                 if ( ! $oldid ) {       # Retrieve current version
 134                         $id = $this->getID();
 135                         if ( 0 == $id ) return;
 136
 137                         $sql = "SELECT " .
 138                           "cur_text,cur_timestamp,cur_user,cur_counter,cur_restrictions,cur_touched " .
 139                           "FROM cur WHERE cur_id={$id}";
 140                         wfDebug( "$sql\n" );
 141                         $res = wfQuery( $sql, DB_READ, $fname );
 142                         if ( 0 == wfNumRows( $res ) ) {
 143                                 return;
 144                         }
 145
 146                         $s = wfFetchObject( $res );
 147                         # If we got a redirect, follow it (unless we've been told
 148                         # not to by either the function parameter or the query
 149                         if ( ( "no" != $redirect ) && ( false == $noredir ) &&
 150                           ( $wgMwRedir->matchStart( $s->cur_text ) ) ) {
 151                                 if ( preg_match( "/\\[\\[([^\\]\\|]+)[\\]\\|]/",
 152                                   $s->cur_text, $m ) ) {
 153                                         $rt = Title::newFromText( $m[1] );
 154                                         if( $rt ) {
 155                                                 # Gotta hand redirects to special pages differently:
 156                                                 # Fill the HTTP response "Location" header and ignore
 157                                                 # the rest of the page we're on.
 158
 159                                                 if ( $rt->getInterwiki() != "" ) {
 160                                                         $wgOut->redirect( $rt->getFullURL() ) ;
 161                                                         return;
 162                                                 }
 163                                                 if ( $rt->getNamespace() == Namespace::getSpecial() ) {
 164                                                         $wgOut->redirect( wfLocalUrl(
 165                                                           $rt->getPrefixedURL() ) );
 166                                                         return;
 167                                                 }
 168                                                 $rid = $rt->getArticleID();
 169                                                 if ( 0 != $rid ) {
 170                                                         $sql = "SELECT cur_text,cur_timestamp,cur_user," .
 171                                                           "cur_counter,cur_restrictions,cur_touched FROM cur WHERE cur_id={$rid}";
 172                                                         $res = wfQuery( $sql, DB_READ, $fname );
 173
 174                                                         if ( 0 != wfNumRows( $res ) ) {
 175                                                                 $this->mRedirectedFrom = $this->mTitle->getPrefixedText();
 176                                                                 $this->mTitle = $rt;
 177                                                                 $s = wfFetchObject( $res );
 178                                                         }
 179                                                 }
 180                                         }
 181                                 }
 182                         }
 183
 184                         $this->mContent = $s->cur_text;
 185                         $this->mUser = $s->cur_user;
 186                         $this->mCounter = $s->cur_counter;
 187                         $this->mTimestamp = $s->cur_timestamp;
 188                         $this->mTouched = $s->cur_touched;
 189                         $this->mTitle->mRestrictions = explode( ",", trim( $s->cur_restrictions ) );
 190                         $this->mTitle->mRestrictionsLoaded = true;
 191                         wfFreeResult( $res );
 192                 } else { # oldid set, retrieve historical version
 193                         $sql = "SELECT old_text,old_timestamp,old_user,old_flags FROM old " .
 194                           "WHERE old_id={$oldid}";
 195                         $res = wfQuery( $sql, DB_READ, $fname );
 196                         if ( 0 == wfNumRows( $res ) ) { return; }
 197
 198                         $s = wfFetchObject( $res );
 199                         $this->mContent = Article::getRevisionText( $s );
 200                         $this->mUser = $s->old_user;
 201                         $this->mCounter = 0;
 202                         $this->mTimestamp = $s->old_timestamp;
 203                         wfFreeResult( $res );
 204                 }
 205
 206                 # Return error message :P
 207                 # Horrible, confusing UI and data. I think this should return false on error -- TS
 208                 if ( !$success ) {
 209                         $t = $this->mTitle->getPrefixedText();
 210                         if ( isset( $oldid ) ) {
 211                                 $oldid = IntVal( $oldid );
 212                                 $t .= ",oldid={$oldid}";
 213                         }
 214                         if ( isset( $redirect ) ) {
 215                                 $redirect = ($redirect == "no") ? "no" : "yes";
 216                                 $t .= ",redirect={$redirect}";
 217                         }
 218                         $this->mContent = wfMsg( "missingarticle", $t );
 219                 }
 220
 221                 $this->mContentLoaded = true;
 222         }
 223
 224         function getID() {
 225                 if( $this->mTitle ) {
 226                         return $this->mTitle->getArticleID();
 227                 } else {
 228                         return 0;
 229                 }
 230         }
 231
 232         function getCount()
 233         {
 234                 if ( -1 == $this->mCounter ) {
 235                         $id = $this->getID();
 236                         $this->mCounter = wfGetSQL( "cur", "cur_counter", "cur_id={$id}" );
 237                 }
 238                 return $this->mCounter;
 239         }
 240
 241         # Would the given text make this article a "good" article (i.e.,
 242         # suitable for including in the article count)?
 243
 244         function isCountable( $text )
 245         {
 246                 global $wgUseCommaCount, $wgMwRedir;
 247
 248                 if ( 0 != $this->mTitle->getNamespace() ) { return 0; }
 249                 if ( $wgMwRedir->matchStart( $text ) ) { return 0; }
 250                 $token = ($wgUseCommaCount ? "," : "[[" );
 251                 if ( false === strstr( $text, $token ) ) { return 0; }
 252                 return 1;
 253         }
 254
 255         # Loads everything from cur except cur_text
 256         # This isn't necessary for all uses, so it's only done if needed.
 257
 258         /* private */ function loadLastEdit()
 259         {
 260                 global $wgOut;
 261                 if ( -1 != $this->mUser ) return;
 262
 263                 $sql = "SELECT cur_user,cur_user_text,cur_timestamp," .
 264                   "cur_comment,cur_minor_edit FROM cur WHERE " .
 265                   "cur_id=" . $this->getID();
 266                 $res = wfQuery( $sql, DB_READ, "Article::loadLastEdit" );
 267
 268                 if ( wfNumRows( $res ) > 0 ) {
 269                         $s = wfFetchObject( $res );
 270                         $this->mUser = $s->cur_user;
 271                         $this->mUserText = $s->cur_user_text;
 272                         $this->mTimestamp = $s->cur_timestamp;
 273                         $this->mComment = $s->cur_comment;
 274                         $this->mMinorEdit = $s->cur_minor_edit;
 275                 }
 276         }
 277
 278         function getTimestamp()
 279         {
 280                 $this->loadLastEdit();
 281                 return $this->mTimestamp;
 282         }
 283
 284         function getUser()
 285         {
 286                 $this->loadLastEdit();
 287                 return $this->mUser;
 288         }
 289
 290         function getUserText()
 291         {
 292                 $this->loadLastEdit();
 293                 return $this->mUserText;
 294         }
 295
 296         function getComment()
 297         {
 298                 $this->loadLastEdit();
 299                 return $this->mComment;
 300         }
 301
 302         function getMinorEdit()
 303         {
 304                 $this->loadLastEdit();
 305                 return $this->mMinorEdit;
 306         }
 307
 308         # This is the default action of the script: just view the page of
 309         # the given title.
 310
 311         function view()
 312         {
 313                 global $wgUser, $wgOut, $wgLang;
 314                 global $oldid, $diff; # From query
 315                 global $wgLinkCache, $IP;
 316                 $fname = "Article::view";
 317                 wfProfileIn( $fname );
 318
 319                 $wgOut->setArticleFlag( true );
 320                 $wgOut->setRobotpolicy( "index,follow" );
 321
 322                 # If we got diff and oldid in the query, we want to see a
 323                 # diff page instead of the article.
 324
 325                 if ( isset( $diff ) ) {
 326                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 327                         $de = new DifferenceEngine( $oldid, $diff );
 328                         $de->showDiffPage();
 329                         wfProfileOut( $fname );
 330                         return;
 331                 }
 332
 333                 if ( !isset( $oldid ) and $this->checkTouched() ) {
 334                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 335                                 return;
 336                         } else if ( $this->tryFileCache() ) {
 337                                 # tell wgOut that output is taken care of
 338                                 $wgOut->disable();
 339                                 $this->viewUpdates();
 340                                 return;
 341                         }
 342                 }
 343
 344                 $text = $this->getContent(); # May change mTitle
 345                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 346                 $wgOut->setHTMLTitle( $this->mTitle->getPrefixedText() .
 347                   " - " . wfMsg( "wikititlesuffix" ) );
 348
 349                 # We're looking at an old revision
 350
 351                 if ( $oldid ) {
 352                         $this->setOldSubtitle();
 353                         $wgOut->setRobotpolicy( "noindex,follow" );
 354                 }
 355                 if ( "" != $this->mRedirectedFrom ) {
 356                         $sk = $wgUser->getSkin();
 357                         $redir = $sk->makeKnownLink( $this->mRedirectedFrom, "",
 358                           "redirect=no" );
 359                         $s = wfMsg( "redirectedfrom", $redir );
 360                         $wgOut->setSubtitle( $s );
 361                 }
 362
 363                 $wgLinkCache->preFill( $this->mTitle );
 364                 $wgOut->addWikiText( $text );
 365
 366                 $this->viewUpdates();
 367                 wfProfileOut( $fname );
 368         }
 369
 370         # Theoretically we could defer these whole insert and update
 371         # functions for after display, but that's taking a big leap
 372         # of faith, and we want to be able to report database
 373         # errors at some point.
 374
 375         /* private */ function insertNewArticle( $text, $summary, $isminor, $watchthis )
 376         {
 377                 global $wgOut, $wgUser, $wgLinkCache, $wgMwRedir;
 378
 379                 $fname = "Article::insertNewArticle";
 380
 381                 $this->mCountAdjustment = $this->isCountable( $text );
 382
 383                 $ns = $this->mTitle->getNamespace();
 384                 $ttl = $this->mTitle->getDBkey();
 385                 $text = $this->preSaveTransform( $text );
 386                 if ( $wgMwRedir->matchStart( $text ) ) { $redir = 1; }
 387                 else { $redir = 0; }
 388
 389                 $now = wfTimestampNow();
 390                 $won = wfInvertTimestamp( $now );
 391                 wfSeedRandom();
 392                 $rand = number_format( mt_rand() / mt_getrandmax(), 12, ".", "" );
 393                 $sql = "INSERT INTO cur (cur_namespace,cur_title,cur_text," .
 394                   "cur_comment,cur_user,cur_timestamp,cur_minor_edit,cur_counter," .
 395                   "cur_restrictions,cur_user_text,cur_is_redirect," .
 396                   "cur_is_new,cur_random,cur_touched,inverse_timestamp) VALUES ({$ns},'" . wfStrencode( $ttl ) . "', '" .
 397                   wfStrencode( $text ) . "', '" .
 398                   wfStrencode( $summary ) . "', '" .
 399                   $wgUser->getID() . "', '{$now}', " .
 400                   ( $isminor ? 1 : 0 ) . ", 0, '', '" .
 401                   wfStrencode( $wgUser->getName() ) . "', $redir, 1, $rand, '{$now}', '{$won}')";
 402                 $res = wfQuery( $sql, DB_WRITE, $fname );
 403
 404                 $newid = wfInsertId();
 405                 $this->mTitle->resetArticleID( $newid );
 406
 407                 Article::onArticleCreate( $this->mTitle );
 408                 RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary );
 409
 410                 if ($watchthis) {
 411                         if(!$this->mTitle->userIsWatching()) $this->watch();
 412                 } else {
 413                         if ( $this->mTitle->userIsWatching() ) {
 414                                 $this->unwatch();
 415                         }
 416                 }
 417
 418                 # The talk page isn't in the regular link tables, so we need to update manually:
 419                 $talkns = $ns ^ 1; # talk -> normal; normal -> talk
 420                 $sql = "UPDATE cur set cur_touched='$now' WHERE cur_namespace=$talkns AND cur_title='" . wfStrencode( $ttl ) . "'";
 421                 wfQuery( $sql, DB_WRITE );
 422
 423                 $this->showArticle( $text, wfMsg( "newarticle" ) );
 424         }
 425
 426         function updateArticle( $text, $summary, $minor, $watchthis, $section = "", $forceBot = false )
 427         {
 428                 global $wgOut, $wgUser, $wgLinkCache;
 429                 global $wgDBtransactions, $wgMwRedir;
 430                 $fname = "Article::updateArticle";
 431
 432                 $this->loadLastEdit();
 433
 434                 // insert updated section into old text if we have only edited part
 435                 // of the article
 436                 if ($section != "") {
 437                         $oldtext=$this->getContent();
 438                         if($section=="new") {
 439                                 if($summary) $subject="== {$summary} ==\n\n";
 440                                 $text=$oldtext."\n\n".$subject.$text;
 441                         } else {
 442                                 $secs=preg_split("/(^=+.*?=+|^<h[1-6].*?>.*?<\/h[1-6].*?>)/mi",
 443                                   $oldtext,-1,PREG_SPLIT_DELIM_CAPTURE);
 444                                 $secs[$section*2]=$text."\n\n"; // replace with edited
 445                                 if($section) { $secs[$section*2-1]=""; } // erase old headline
 446                                 $text=join("",$secs);
 447                         }
 448                 }
 449                 if ( $this->mMinorEdit ) { $me1 = 1; } else { $me1 = 0; }
 450                 if ( $minor ) { $me2 = 1; } else { $me2 = 0; }
 451                 if ( preg_match( "/^((" . $wgMwRedir->getBaseRegex() . ")[^\\n]+)/i", $text, $m ) ) {
 452                         $redir = 1;
 453                         $text = $m[1] . "\n"; # Remove all content but redirect
 454                 }
 455                 else { $redir = 0; }
 456
 457                 $text = $this->preSaveTransform( $text );
 458
 459                 # Update article, but only if changed.
 460
 461                 if( $wgDBtransactions ) {
 462                         $sql = "BEGIN";
 463                         wfQuery( $sql, DB_WRITE );
 464                 }
 465                 $oldtext = $this->getContent( true );
 466
 467                 if ( 0 != strcmp( $text, $oldtext ) ) {
 468                         $this->mCountAdjustment = $this->isCountable( $text )
 469                           - $this->isCountable( $oldtext );
 470
 471                         $now = wfTimestampNow();
 472                         $won = wfInvertTimestamp( $now );
 473                         $sql = "UPDATE cur SET cur_text='" . wfStrencode( $text ) .
 474                           "',cur_comment='" .  wfStrencode( $summary ) .
 475                           "',cur_minor_edit={$me2}, cur_user=" . $wgUser->getID() .
 476                           ",cur_timestamp='{$now}',cur_user_text='" .
 477                           wfStrencode( $wgUser->getName() ) .
 478                           "',cur_is_redirect={$redir}, cur_is_new=0, cur_touched='{$now}', inverse_timestamp='{$won}' " .
 479                           "WHERE cur_id=" . $this->getID() .
 480                           " AND cur_timestamp='" . $this->getTimestamp() . "'";
 481                         $res = wfQuery( $sql, DB_WRITE, $fname );
 482
 483                         if( wfAffectedRows() == 0 ) {
 484                                 /* Belated edit conflict! Run away!! */
 485                                 return false;
 486                         }
 487
 488                         # This overwrites $oldtext if revision compression is on
 489                         $flags = Article::compressRevisionText( $oldtext );
 490
 491                         $sql = "INSERT INTO old (old_namespace,old_title,old_text," .
 492                           "old_comment,old_user,old_user_text,old_timestamp," .
 493                           "old_minor_edit,inverse_timestamp,old_flags) VALUES (" .
 494                           $this->mTitle->getNamespace() . ", '" .
 495                           wfStrencode( $this->mTitle->getDBkey() ) . "', '" .
 496                           wfStrencode( $oldtext ) . "', '" .
 497                           wfStrencode( $this->getComment() ) . "', " .
 498                           $this->getUser() . ", '" .
 499                           wfStrencode( $this->getUserText() ) . "', '" .
 500                           $this->getTimestamp() . "', " . $me1 . ", '" .
 501                           wfInvertTimestamp( $this->getTimestamp() ) . "','$flags')";
 502                         $res = wfQuery( $sql, DB_WRITE, $fname );
 503                         $oldid = wfInsertID( $res );
 504
 505                         $bot = (int)($wgUser->isBot() || $forceBot);
 506                         RecentChange::notifyEdit( $now, $this->mTitle, $me2, $wgUser, $this->getComment(),
 507                                 $oldid, $this->getTimestamp() );
 508                         Article::onArticleEdit( $this->mTitle );
 509                 }
 510
 511                 if( $wgDBtransactions ) {
 512                         $sql = "COMMIT";
 513                         wfQuery( $sql, DB_WRITE );
 514                 }
 515
 516                 if ($watchthis) {
 517                         if (!$this->mTitle->userIsWatching()) $this->watch();
 518                 } else {
 519                         if ( $this->mTitle->userIsWatching() ) {
 520                                 $this->unwatch();
 521                         }
 522                 }
 523
 524                 $this->showArticle( $text, wfMsg( "updated" ) );
 525                 return true;
 526         }
 527
 528         # After we've either updated or inserted the article, update
 529         # the link tables and redirect to the new page.
 530
 531         function showArticle( $text, $subtitle )
 532         {
 533                 global $wgOut, $wgUser, $wgLinkCache;
 534                 global $wgMwRedir;
 535
 536                 $wgLinkCache = new LinkCache();
 537
 538                 # Get old version of link table to allow incremental link updates
 539                 $wgLinkCache->preFill( $this->mTitle );
 540                 $wgLinkCache->clear();
 541
 542                 # Now update the link cache by parsing the text
 543                 $wgOut = new OutputPage();
 544                 $wgOut->addWikiText( $text );
 545
 546                 $this->editUpdates( $text );
 547                 if( $wgMwRedir->matchStart( $text ) )
 548                         $r = "redirect=no";
 549                 else
 550                         $r = "";
 551                 $wgOut->redirect( wfLocalUrl( $this->mTitle->getPrefixedURL(), $r ) );
 552         }
 553
 554         # Add this page to my watchlist
 555
 556         function watch( $add = true )
 557         {
 558                 global $wgUser, $wgOut, $wgLang;
 559                 global $wgDeferredUpdateList;
 560
 561                 if ( 0 == $wgUser->getID() ) {
 562                         $wgOut->errorpage( "watchnologin", "watchnologintext" );
 563                         return;
 564                 }
 565                 if ( wfReadOnly() ) {
 566                         $wgOut->readOnlyPage();
 567                         return;
 568                 }
 569                 if( $add )
 570                         $wgUser->addWatch( $this->mTitle );
 571                 else
 572                         $wgUser->removeWatch( $this->mTitle );
 573
 574                 $wgOut->setPagetitle( wfMsg( $add ? "addedwatch" : "removedwatch" ) );
 575                 $wgOut->setRobotpolicy( "noindex,follow" );
 576
 577                 $sk = $wgUser->getSkin() ;
 578                 $link = $sk->makeKnownLink ( $this->mTitle->getPrefixedText() ) ;
 579
 580                 if($add)
 581                         $text = wfMsg( "addedwatchtext", $link );
 582                 else
 583                         $text = wfMsg( "removedwatchtext", $link );
 584                 $wgOut->addHTML( $text );
 585
 586                 $up = new UserUpdate();
 587                 array_push( $wgDeferredUpdateList, $up );
 588
 589                 $wgOut->returnToMain( false );
 590         }
 591
 592         function unwatch()
 593         {
 594                 $this->watch( false );
 595         }
 596
 597         function protect( $limit = "sysop" )
 598         {
 599                 global $wgUser, $wgOut;
 600
 601                 if ( ! $wgUser->isSysop() ) {
 602                         $wgOut->sysopRequired();
 603                         return;
 604                 }
 605                 if ( wfReadOnly() ) {
 606                         $wgOut->readOnlyPage();
 607                         return;
 608                 }
 609                 $id = $this->mTitle->getArticleID();
 610                 if ( 0 == $id ) {
 611                         $wgOut->fatalEror( wfMsg( "badarticleerror" ) );
 612                         return;
 613                 }
 614         $sql = "UPDATE cur SET cur_touched='" . wfTimestampNow() . "'," .
 615                         "cur_restrictions='{$limit}' WHERE cur_id={$id}";
 616                 wfQuery( $sql, DB_WRITE, "Article::protect" );
 617
 618                 $log = new LogPage( wfMsg( "protectlogpage" ), wfMsg( "protectlogtext" ) );
 619                 if ( $limit === "" ) {
 620                         $log->addEntry( wfMsg( "unprotectedarticle", $this->mTitle->getPrefixedText() ), "" );
 621                 } else {
 622                         $log->addEntry( wfMsg( "protectedarticle", $this->mTitle->getPrefixedText() ), "" );
 623                 }
 624                 $wgOut->redirect( wfLocalUrl( $this->mTitle->getPrefixedURL() ) );
 625         }
 626
 627         function unprotect()
 628         {
 629                 return $this->protect( "" );
 630         }
 631
 632         function delete()
 633         {
 634                 global $wgUser, $wgOut, $wgMessageCache;
 635                 global $wpConfirm, $wpReason, $image, $oldimage;
 636
 637                 # This code desperately needs to be totally rewritten
 638
 639                 if ( ( ! $wgUser->isSysop() ) ) {
 640                         $wgOut->sysopRequired();
 641                         return;
 642                 }
 643                 if ( wfReadOnly() ) {
 644                         $wgOut->readOnlyPage();
 645                         return;
 646                 }
 647
 648                 # Can't delete cached MediaWiki namespace (i.e. vital messages)
 649                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI && $wgMessageCache->isCacheable( $this->mTitle->getDBkey() ) ) {
 650                         $wgOut->fatalError( wfMsg( "cannotdelete" ) );
 651                         return;
 652                 }
 653
 654                 # Better double-check that it hasn't been deleted yet!
 655                 $wgOut->setPagetitle( wfMsg( "confirmdelete" ) );
 656                 if ( ( "" == trim( $this->mTitle->getText() ) )
 657                   or ( $this->mTitle->getArticleId() == 0 ) ) {
 658                         $wgOut->fatalError( wfMsg( "cannotdelete" ) );
 659                         return;
 660                 }
 661
 662                 if ( $_POST["wpConfirm"] ) {
 663                         $this->doDelete();
 664                         return;
 665                 }
 666
 667                 # determine whether this page has earlier revisions
 668                 # and insert a warning if it does
 669                 # we select the text because it might be useful below
 670                 $ns = $this->mTitle->getNamespace();
 671                 $title = $this->mTitle->getDBkey();
 672                 $etitle = wfStrencode( $title );
 673                 $sql = "SELECT old_text,old_flags FROM old WHERE old_namespace=$ns and old_title='$etitle' ORDER BY inverse_timestamp LIMIT 1";
 674                 $res = wfQuery( $sql, DB_READ, $fname );
 675                 if( ($old=wfFetchObject($res)) && !$wpConfirm ) {
 676                         $skin=$wgUser->getSkin();
 677                         $wgOut->addHTML("<B>".wfMsg("historywarning"));
 678                         $wgOut->addHTML( $skin->historyLink() ."</B><P>");
 679                 }
 680
 681                 $sql="SELECT cur_text FROM cur WHERE cur_namespace=$ns and cur_title='$etitle'";
 682                 $res=wfQuery($sql, DB_READ, $fname);
 683                 if( ($s=wfFetchObject($res))) {
 684
 685                         # if this is a mini-text, we can paste part of it into the deletion reason
 686
 687                         #if this is empty, an earlier revision may contain "useful" text
 688                         if($s->cur_text!="") {
 689                                 $text=$s->cur_text;
 690                         } else {
 691                                 if($old) {
 692                                         $text = Article::getRevisionText( $old );
 693                                         $blanked=1;
 694                                 }
 695
 696                         }
 697
 698                         $length=strlen($text);
 699
 700                         # this should not happen, since it is not possible to store an empty, new
 701                         # page. Let's insert a standard text in case it does, though
 702                         if($length==0 && !$wpReason) { $wpReason=wfmsg("exblank");}
 703
 704
 705                         if($length < 500 && !$wpReason) {
 706
 707                                 # comment field=255, let's grep the first 150 to have some user
 708                                 # space left
 709                                 $text=substr($text,0,150);
 710                                 # let's strip out newlines and HTML tags
 711                                 $text=preg_replace("/\"/","'",$text);
 712                                 $text=preg_replace("/\</","&lt;",$text);
 713                                 $text=preg_replace("/\>/","&gt;",$text);
 714                                 $text=preg_replace("/[\n\r]/","",$text);
 715                                 if(!$blanked) {
 716                                         $wpReason=wfMsg("excontent"). " '".$text;
 717                                 } else {
 718                                         $wpReason=wfMsg("exbeforeblank") . " '".$text;
 719                                 }
 720                                 if($length>150) { $wpReason .= "..."; } # we've only pasted part of the text
 721                                 $wpReason.="'";
 722                         }
 723                 }
 724
 725                 return $this->confirmDelete();
 726         }
 727
 728         function confirmDelete( $par = "" )
 729         {
 730                 global $wgOut;
 731                 global $wpReason;
 732
 733                 wfDebug( "Article::confirmDelete\n" );
 734
 735                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
 736                 $wgOut->setSubtitle( wfMsg( "deletesub", $sub ) );
 737                 $wgOut->setRobotpolicy( "noindex,nofollow" );
 738                 $wgOut->addWikiText( wfMsg( "confirmdeletetext" ) );
 739
 740                 $t = $this->mTitle->getPrefixedURL();
 741
 742                 $formaction = wfEscapeHTML( wfLocalUrl( $t, "action=delete" . $par ) );
 743                 $confirm = wfMsg( "confirm" );
 744                 $check = wfMsg( "confirmcheck" );
 745                 $delcom = wfMsg( "deletecomment" );
 746
 747                 $wgOut->addHTML( "
 748 <form id=\"deleteconfirm\" method=\"post\" action=\"{$formaction}\">
 749 <table border=0><tr><td align=right>
 750 {$delcom}:</td><td align=left>
 751 <input type=text size=60 name=\"wpReason\" value=\"" . htmlspecialchars( $wpReason ) . "\">
 752 </td></tr><tr><td>&nbsp;</td></tr>
 753 <tr><td align=right>
 754 <input type=checkbox name=\"wpConfirm\" value='1' id=\"wpConfirm\">
 755 </td><td><label for=\"wpConfirm\">{$check}</label></td>
 756 </tr><tr><td>&nbsp;</td><td>
 757 <input type=submit name=\"wpConfirmB\" value=\"{$confirm}\">
 758 </td></tr></table></form>\n" );
 759
 760                 $wgOut->returnToMain( false );
 761         }
 762
 763         function doDelete()
 764         {
 765                 global $wgOut, $wgUser, $wgLang;
 766                 global $wpReason;
 767                 $fname = "Article::doDelete";
 768                 wfDebug( "$fname\n" );
 769
 770                 $this->doDeleteArticle( $this->mTitle );
 771                 $deleted = $this->mTitle->getPrefixedText();
 772
 773                 $wgOut->setPagetitle( wfMsg( "actioncomplete" ) );
 774                 $wgOut->setRobotpolicy( "noindex,nofollow" );
 775
 776                 $sk = $wgUser->getSkin();
 777                 $loglink = $sk->makeKnownLink( $wgLang->getNsText(
 778                   Namespace::getWikipedia() ) .
 779                   ":" . wfMsg( "dellogpage" ), wfMsg( "deletionlog" ) );
 780
 781                 $text = wfMsg( "deletedtext", $deleted, $loglink );
 782
 783                 $wgOut->addHTML( "<p>" . $text );
 784                 $wgOut->returnToMain( false );
 785         }
 786
 787         function doDeleteArticle( $title )
 788         {
 789                 global $wgUser, $wgOut, $wgLang, $wpReason, $wgDeferredUpdateList;
 790
 791                 $fname = "Article::doDeleteArticle";
 792                 wfDebug( "$fname\n" );
 793
 794                 $ns = $title->getNamespace();
 795                 $t = wfStrencode( $title->getDBkey() );
 796                 $id = $title->getArticleID();
 797
 798                 if ( "" == $t ) {
 799                         $wgOut->fatalError( wfMsg( "cannotdelete" ) );
 800                         return;
 801                 }
 802
 803                 $u = new SiteStatsUpdate( 0, 1, -$this->isCountable( $this->getContent( true ) ) );
 804                 array_push( $wgDeferredUpdateList, $u );
 805
 806                 # Move article and history to the "archive" table
 807                 $sql = "INSERT INTO archive (ar_namespace,ar_title,ar_text," .
 808                   "ar_comment,ar_user,ar_user_text,ar_timestamp,ar_minor_edit," .
 809                   "ar_flags) SELECT cur_namespace,cur_title,cur_text,cur_comment," .
 810                   "cur_user,cur_user_text,cur_timestamp,cur_minor_edit,0 FROM cur " .
 811                   "WHERE cur_namespace={$ns} AND cur_title='{$t}'";
 812                 wfQuery( $sql, DB_WRITE, $fname );
 813
 814                 $sql = "INSERT INTO archive (ar_namespace,ar_title,ar_text," .
 815                   "ar_comment,ar_user,ar_user_text,ar_timestamp,ar_minor_edit," .
 816                   "ar_flags) SELECT old_namespace,old_title,old_text,old_comment," .
 817                   "old_user,old_user_text,old_timestamp,old_minor_edit,old_flags " .
 818                   "FROM old WHERE old_namespace={$ns} AND old_title='{$t}'";
 819                 wfQuery( $sql, DB_WRITE, $fname );
 820
 821                 # Now that it's safely backed up, delete it
 822
 823                 $sql = "DELETE FROM cur WHERE cur_namespace={$ns} AND " .
 824                   "cur_title='{$t}'";
 825                 wfQuery( $sql, DB_WRITE, $fname );
 826
 827                 $sql = "DELETE FROM old WHERE old_namespace={$ns} AND " .
 828                   "old_title='{$t}'";
 829                 wfQuery( $sql, DB_WRITE, $fname );
 830
 831                 $sql = "DELETE FROM recentchanges WHERE rc_namespace={$ns} AND " .
 832                   "rc_title='{$t}'";
 833                 wfQuery( $sql, DB_WRITE, $fname );
 834
 835                 # Finally, clean up the link tables
 836
 837                 if ( 0 != $id ) {
 838
 839                         $t = wfStrencode( $title->getPrefixedDBkey() );
 840
 841                         Article::onArticleDelete( $title );
 842
 843                         $sql = "SELECT l_from FROM links WHERE l_to={$id}";
 844                         $res = wfQuery( $sql, DB_READ, $fname );
 845
 846                         $sql = "INSERT INTO brokenlinks (bl_from,bl_to) VALUES ";
 847                         $now = wfTimestampNow();
 848                         $sql2 = "UPDATE cur SET cur_touched='{$now}' WHERE cur_id IN (";
 849                         $first = true;
 850
 851                         while ( $s = wfFetchObject( $res ) ) {
 852                                 $nt = Title::newFromDBkey( $s->l_from );
 853                                 $lid = $nt->getArticleID();
 854
 855                                 if ( ! $first ) { $sql .= ","; $sql2 .= ","; }
 856                                 $first = false;
 857                                 $sql .= "({$lid},'{$t}')";
 858                                 $sql2 .= "{$lid}";
 859                         }
 860                         $sql2 .= ")";
 861                         if ( ! $first ) {
 862                                 wfQuery( $sql, DB_WRITE, $fname );
 863                                 wfQuery( $sql2, DB_WRITE, $fname );
 864                         }
 865                         wfFreeResult( $res );
 866
 867                         $sql = "DELETE FROM links WHERE l_to={$id}";
 868                         wfQuery( $sql, DB_WRITE, $fname );
 869
 870                         $sql = "DELETE FROM links WHERE l_from='{$t}'";
 871                         wfQuery( $sql, DB_WRITE, $fname );
 872
 873                         $sql = "DELETE FROM imagelinks WHERE il_from='{$t}'";
 874                         wfQuery( $sql, DB_WRITE, $fname );
 875
 876                         $sql = "DELETE FROM brokenlinks WHERE bl_from={$id}";
 877                         wfQuery( $sql, DB_WRITE, $fname );
 878                 }
 879
 880                 $log = new LogPage( wfMsg( "dellogpage" ), wfMsg( "dellogpagetext" ) );
 881                 $art = $title->getPrefixedText();
 882                 $wpReason = wfCleanQueryVar( $wpReason );
 883                 $log->addEntry( wfMsg( "deletedarticle", $art ), $wpReason );
 884
 885                 # Clear the cached article id so the interface doesn't act like we exist
 886                 $this->mTitle->resetArticleID( 0 );
 887                 $this->mTitle->mArticleID = 0;
 888         }
 889
 890         function rollback()
 891         {
 892                 global $wgUser, $wgLang, $wgOut, $from;
 893
 894                 if ( ! $wgUser->isSysop() ) {
 895                         $wgOut->sysopRequired();
 896                         return;
 897                 }
 898                 if ( wfReadOnly() ) {
 899                         $wgOut->readOnlyPage( $this->getContent() );
 900                         return;
 901                 }
 902
 903                 # Secret enhanced rollback, marks edits rc_bot=1
 904                 $bot = !!$_REQUEST['bot'];
 905
 906                 # Replace all this user's current edits with the next one down
 907                 $tt = wfStrencode( $this->mTitle->getDBKey() );
 908                 $n = $this->mTitle->getNamespace();
 909
 910                 # Get the last editor
 911                 $sql = "SELECT cur_id,cur_user,cur_user_text,cur_comment FROM cur WHERE cur_title='{$tt}' AND cur_namespace={$n}";
 912                 $res = wfQuery( $sql, DB_READ );
 913                 if( ($x = wfNumRows( $res )) != 1 ) {
 914                         # Something wrong
 915                         $wgOut->addHTML( wfMsg( "notanarticle" ) );
 916                         return;
 917                 }
 918                 $s = wfFetchObject( $res );
 919                 $ut = wfStrencode( $s->cur_user_text );
 920                 $uid = $s->cur_user;
 921                 $pid = $s->cur_id;
 922
 923                 $from = str_replace( '_', ' ', wfCleanQueryVar( $from ) );
 924                 if( $from != $s->cur_user_text ) {
 925                         $wgOut->setPageTitle(wfmsg("rollbackfailed"));
 926                         $wgOut->addWikiText( wfMsg( "alreadyrolled",
 927                                 htmlspecialchars( $this->mTitle->getPrefixedText()),
 928                                 htmlspecialchars( $from ),
 929                                 htmlspecialchars( $s->cur_user_text ) ) );
 930                         if($s->cur_comment != "") {
 931                                 $wgOut->addHTML(
 932                                         wfMsg("editcomment",
 933                                         htmlspecialchars( $s->cur_comment ) ) );
 934                                 }
 935                         return;
 936                 }
 937
 938                 # Get the last edit not by this guy
 939                 $sql = "SELECT old_text,old_user,old_user_text,old_timestamp,old_flags
 940                 FROM old USE INDEX (name_title_timestamp)
 941                 WHERE old_namespace={$n} AND old_title='{$tt}'
 942                 AND (old_user <> {$uid} OR old_user_text <> '{$ut}')
 943                 ORDER BY inverse_timestamp LIMIT 1";
 944                 $res = wfQuery( $sql, DB_READ );
 945                 if( wfNumRows( $res ) != 1 ) {
 946                         # Something wrong
 947                         $wgOut->setPageTitle(wfMsg("rollbackfailed"));
 948                         $wgOut->addHTML( wfMsg( "cantrollback" ) );
 949                         return;
 950                 }
 951                 $s = wfFetchObject( $res );
 952
 953                 if ( $bot ) {
 954                         # Mark all reverted edits as bot
 955                         $sql = "UPDATE recentchanges SET rc_bot=1 WHERE
 956                                 rc_cur_id=$pid AND rc_user=$uid AND rc_timestamp > '{$s->old_timestamp}'";
 957                         wfQuery( $sql, DB_WRITE, $fname );
 958                 }
 959
 960                 # Save it!
 961                 $newcomment = wfMsg( "revertpage", $s->old_user_text );
 962                 $wgOut->setPagetitle( wfMsg( "actioncomplete" ) );
 963                 $wgOut->setRobotpolicy( "noindex,nofollow" );
 964                 $wgOut->addHTML( "<h2>" . $newcomment . "</h2>\n<hr>\n" );
 965                 $this->updateArticle( Article::getRevisionText( $s ), $newcomment, 1, $this->mTitle->userIsWatching(), "", $bot );
 966
 967                 Article::onArticleEdit( $this->mTitle );
 968                 $wgOut->returnToMain( false );
 969         }
 970
 971
 972         # Do standard deferred updates after page view
 973
 974         /* private */ function viewUpdates()
 975         {
 976                 global $wgDeferredUpdateList;
 977                 if ( 0 != $this->getID() ) {
 978                         global $wgDisableCounters;
 979                         if( !$wgDisableCounters ) {
 980                                 Article::incViewCount( $this->getID() );
 981                                 $u = new SiteStatsUpdate( 1, 0, 0 );
 982                                 array_push( $wgDeferredUpdateList, $u );
 983                         }
 984                         $u = new UserTalkUpdate( 0, $this->mTitle->getNamespace(),
 985                           $this->mTitle->getDBkey() );
 986                         array_push( $wgDeferredUpdateList, $u );
 987                 }
 988         }
 989
 990         # Do standard deferred updates after page edit.
 991         # Every 1000th edit, prune the recent changes table.
 992
 993         /* private */ function editUpdates( $text )
 994         {
 995                 global $wgDeferredUpdateList, $wgDBname, $wgMemc;
 996                 global $wgMessageCache;
 997
 998                 wfSeedRandom();
 999                 if ( 0 == mt_rand( 0, 999 ) ) {
1000                         $cutoff = wfUnix2Timestamp( time() - ( 7 * 86400 ) );
1001                         $sql = "DELETE FROM recentchanges WHERE rc_timestamp < '{$cutoff}'";
1002                         wfQuery( $sql, DB_WRITE );
1003                 }
1004                 $id = $this->getID();
1005                 $title = $this->mTitle->getPrefixedDBkey();
1006                 $shortTitle = $this->mTitle->getDBkey();
1007
1008                 $adj = $this->mCountAdjustment;
1009
1010                 if ( 0 != $id ) {
1011                         $u = new LinksUpdate( $id, $title );
1012                         array_push( $wgDeferredUpdateList, $u );
1013                         $u = new SiteStatsUpdate( 0, 1, $adj );
1014                         array_push( $wgDeferredUpdateList, $u );
1015                         $u = new SearchUpdate( $id, $title, $text );
1016                         array_push( $wgDeferredUpdateList, $u );
1017
1018                         $u = new UserTalkUpdate( 1, $this->mTitle->getNamespace(), $shortTitle );
1019                         array_push( $wgDeferredUpdateList, $u );
1020
1021                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1022                                 $wgMessageCache->replace( $shortTitle, $text );
1023                         }
1024                 }
1025         }
1026
1027         /* private */ function setOldSubtitle()
1028         {
1029                 global $wgLang, $wgOut;
1030
1031                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
1032                 $r = wfMsg( "revisionasof", $td );
1033                 $wgOut->setSubtitle( "({$r})" );
1034         }
1035
1036         # This function is called right before saving the wikitext,
1037         # so we can do things like signatures and links-in-context.
1038
1039         function preSaveTransform( $text )
1040         {
1041                 $s = "";
1042                 while ( "" != $text ) {
1043                         $p = preg_split( "/<\\s*nowiki\\s*>/i", $text, 2 );
1044                         $s .= $this->pstPass2( $p[0] );
1045
1046                         if ( ( count( $p ) < 2 ) || ( "" == $p[1] ) ) { $text = ""; }
1047                         else {
1048                                 $q = preg_split( "/<\\/\\s*nowiki\\s*>/i", $p[1], 2 );
1049                                 $s .= "<nowiki>{$q[0]}</nowiki>";
1050                                 $text = $q[1];
1051                         }
1052                 }
1053                 return rtrim( $s );
1054         }
1055
1056         /* private */ function pstPass2( $text )
1057         {
1058                 global $wgUser, $wgLang, $wgLocaltimezone;
1059
1060                 # Signatures
1061                 #
1062                 $n = $wgUser->getName();
1063                 $k = $wgUser->getOption( "nickname" );
1064                 if ( "" == $k ) { $k = $n; }
1065                 if(isset($wgLocaltimezone)) {
1066                         $oldtz = getenv("TZ"); putenv("TZ=$wgLocaltimezone");
1067                 }
1068                 /* Note: this is an ugly timezone hack for the European wikis */
1069                 $d = $wgLang->timeanddate( date( "YmdHis" ), false ) .
1070                   " (" . date( "T" ) . ")";
1071                 if(isset($wgLocaltimezone)) putenv("TZ=$oldtz");
1072
1073                 $text = preg_replace( "/~~~~/", "[[" . $wgLang->getNsText(
1074                   Namespace::getUser() ) . ":$n|$k]] $d", $text );
1075                 $text = preg_replace( "/~~~/", "[[" . $wgLang->getNsText(
1076                   Namespace::getUser() ) . ":$n|$k]]", $text );
1077
1078                 # Context links: [[|name]] and [[name (context)|]]
1079                 #
1080                 $tc = "[&;%\\-,.\\(\\)' _0-9A-Za-z\\/:\\x80-\\xff]";
1081                 $np = "[&;%\\-,.' _0-9A-Za-z\\/:\\x80-\\xff]"; # No parens
1082                 $namespacechar = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
1083                 $conpat = "/^({$np}+) \\(({$tc}+)\\)$/";
1084
1085                 $p1 = "/\[\[({$np}+) \\(({$np}+)\\)\\|]]/";             # [[page (context)|]]
1086                 $p2 = "/\[\[\\|({$tc}+)]]/";                                    # [[|page]]
1087                 $p3 = "/\[\[($namespacechar+):({$np}+)\\|]]/";          # [[namespace:page|]]
1088                 $p4 = "/\[\[($namespacechar+):({$np}+) \\(({$np}+)\\)\\|]]/";
1089                                                                                                                 # [[ns:page (cont)|]]
1090                 $context = "";
1091                 $t = $this->mTitle->getText();
1092                 if ( preg_match( $conpat, $t, $m ) ) {
1093                         $context = $m[2];
1094                 }
1095                 $text = preg_replace( $p4, "[[\\1:\\2 (\\3)|\\2]]", $text );
1096                 $text = preg_replace( $p1, "[[\\1 (\\2)|\\1]]", $text );
1097                 $text = preg_replace( $p3, "[[\\1:\\2|\\2]]", $text );
1098
1099                 if ( "" == $context ) {
1100                         $text = preg_replace( $p2, "[[\\1]]", $text );
1101                 } else {
1102                         $text = preg_replace( $p2, "[[\\1 ({$context})|\\1]]", $text );
1103                 }
1104
1105                 # {{SUBST:xxx}} variables
1106                 #
1107                 $mw =& MagicWord::get( MAG_SUBST );
1108                 $text = $mw->substituteCallback( $text, "wfReplaceSubstVar" );
1109
1110 /* Experimental:
1111                 # Trim trailing whitespace
1112                 # MAG_END (__END__) tag allows for trailing
1113                 # whitespace to be deliberately included
1114                 $text = rtrim( $text );
1115                 $mw =& MagicWord::get( MAG_END );
1116                 $mw->matchAndRemove( $text );
1117 */
1118                 return $text;
1119         }
1120
1121         /* Caching functions */
1122
1123         # checkLastModified returns true iff it has taken care of all
1124         # output to the client that is necessary for this request.
1125         # (that is, it has sent a cached version of the page)
1126         function tryFileCache() {
1127                 static $called = false;
1128                 if( $called ) {
1129                         wfDebug( " tryFileCache() -- called twice!?\n" );
1130                         return;
1131                 }
1132                 $called = true;
1133                 if($this->isFileCacheable()) {
1134                         $touched = $this->mTouched;
1135                         if( $this->mTitle->getPrefixedDBkey() == wfMsg( "mainpage" ) ) {
1136                                 # Expire the main page quicker
1137                                 $expire = wfUnix2Timestamp( time() - 3600 );
1138                                 $touched = max( $expire, $touched );
1139                         }
1140                         $cache = new CacheManager( $this->mTitle );
1141                         if($cache->isFileCacheGood( $touched )) {
1142                                 global $wgOut;
1143                                 wfDebug( " tryFileCache() - about to load\n" );
1144                                 $cache->loadFromFileCache();
1145                                 return true;
1146                         } else {
1147                                 wfDebug( " tryFileCache() - starting buffer\n" );
1148                                 ob_start( array(&$cache, 'saveToFileCache' ) );
1149                         }
1150                 } else {
1151                         wfDebug( " tryFileCache() - not cacheable\n" );
1152                 }
1153         }
1154
1155         function isFileCacheable() {
1156                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader;
1157                 global $action, $oldid, $diff, $redirect, $printable;
1158                 return $wgUseFileCache
1159                         and (!$wgShowIPinHeader)
1160                         and ($this->getID() != 0)
1161                         and ($wgUser->getId() == 0)
1162                         and (!$wgUser->getNewtalk())
1163                         and ($this->mTitle->getNamespace() != Namespace::getSpecial())
1164                         and ($action == "view")
1165                         and (!isset($oldid))
1166                         and (!isset($diff))
1167                         and (!isset($redirect))
1168                         and (!isset($printable))
1169                         and (!$this->mRedirectedFrom);
1170         }
1171
1172         function checkTouched() {
1173                 $id = $this->getID();
1174                 $sql = "SELECT cur_touched,cur_is_redirect FROM cur WHERE cur_id=$id";
1175                 $res = wfQuery( $sql, DB_READ, "Article::checkTouched" );
1176                 if( $s = wfFetchObject( $res ) ) {
1177                         $this->mTouched = $s->cur_touched;
1178                         return !$s->cur_is_redirect;
1179                 } else {
1180                         return false;
1181                 }
1182         }
1183
1184         /* static */ function incViewCount( $id )
1185         {
1186                 $id = intval( $id );
1187
1188                 # Not important enough to warrant an error page in case of failure
1189                 $oldignore = wfIgnoreSQLErrors( true );
1190
1191                 wfQuery("INSERT INTO hitcounter (hc_id) VALUES ({$id})", DB_WRITE);
1192
1193                 if( (rand() % 23 != 0) or (wfLastErrno() != 0) ){
1194                         # Most of the time (or on SQL errors), skip row count check
1195                         wfIgnoreSQLErrors( $oldignore );
1196                         return;
1197                 }
1198
1199                 $res = wfQuery("SELECT COUNT(*) as n FROM hitcounter", DB_WRITE);
1200                 $row = wfFetchObject( $res );
1201                 $rown = intval( $row->n );
1202                 if( $rown > 1000 ){ // update counters after ~1000 hits
1203                         wfProfileIn( "Article::incViewCount-collect" );
1204                         $old_user_abort = ignore_user_abort( true );
1205
1206                         wfQuery("LOCK TABLES hitcounter WRITE", DB_WRITE);
1207                         wfQuery("CREATE TEMPORARY TABLE acchits TYPE=HEAP ".
1208                                 "SELECT hc_id,COUNT(*) AS hc_n FROM hitcounter ".
1209                                 "GROUP BY hc_id", DB_WRITE);
1210                         wfQuery("DELETE FROM hitcounter", DB_WRITE);
1211                         wfQuery("UNLOCK TABLES", DB_WRITE);
1212                         wfQuery("UPDATE cur,acchits SET cur_counter=cur_counter + hc_n ".
1213                                 "WHERE cur_id = hc_id", DB_WRITE);
1214                         wfQuery("DROP TABLE acchits", DB_WRITE);
1215
1216                         ignore_user_abort( $old_user_abort );
1217                         wfProfileOut( "Article::incViewCount-collect" );
1218                 }
1219                 wfIgnoreSQLErrors( $oldignore );
1220         }
1221
1222         # The onArticle*() functions are supposed to be a kind of hooks
1223         # which should be called whenever any of the specified actions
1224         # are done.
1225         #
1226         # This is a good place to put code to clear caches, for instance.
1227
1228         /* static */ function onArticleCreate($title_obj){
1229                 global $wgEnablePersistentLC, $wgEnableParserCache;
1230                 if ( $wgEnablePersistentLC ) {
1231                         LinkCache::linksccClearBrokenLinksTo( $title_obj->getPrefixedDBkey() );
1232                 }
1233                 if ( $wgEnableParserCache ) {
1234                         OutputPage::parsercacheClearBrokenLinksTo( $title_obj->getPrefixedDBkey() );
1235                 }
1236         }
1237
1238         /* static */ function onArticleDelete($title_obj){
1239                 global $wgEnablePersistentLC, $wgEnableParserCache;
1240                 if ( $wgEnablePersistentLC ) {
1241                         LinkCache::linksccClearLinksTo( $title_obj->getArticleID() );
1242                 }
1243                 if ( $wgEnableParserCache ) {
1244                         OutputPage::parsercacheClearLinksTo( $title_obj->getArticleID() );
1245                 }
1246         }
1247
1248         /* static */ function onArticleEdit($title_obj){
1249                 global $wgEnablePersistentLC, $wgEnableParserCache;
1250                 if ( $wgEnablePersistentLC ) {
1251                         LinkCache::linksccClearPage( $title_obj->getArticleID() );
1252                 }
1253                 if ( $wgEnableParserCache ) {
1254                         OutputPage::parsercacheClearPage( $title_obj->getArticleID() );
1255                 }
1256         }
1257 }
1258
1259 function wfReplaceSubstVar( $matches ) {
1260         return wfMsg( $matches[1] );
1261 }
1262
1263 ?>