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 $action,$section,$count; # From query string
  68                 $fname =  "Article::getContent";
  69                 wfProfileIn( $fname );
  70
  71                 if ( 0 == $this->getID() ) {
  72                         if ( "edit" == $action ) {
  73                                 wfProfileOut( $fname );
  74                                 return ""; # was "newarticletext", now moved above the box)
  75                         }
  76                         wfProfileOut( $fname );
  77                         return wfMsg( "noarticletext" );
  78                 } else {
  79                         $this->loadContent( $noredir );
  80
  81                         if(
  82                                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
  83                                 ( $this->mTitle->getNamespace() == Namespace::getTalk( Namespace::getUser()) ) &&
  84                                   preg_match("/^\d{1,3}\.\d{1,3}.\d{1,3}\.\d{1,3}$/",$this->mTitle->getText()) &&
  85                                   $action=="view"
  86                                 )
  87                                 {
  88                                 wfProfileOut( $fname );
  89                                 return $this->mContent . "\n" .wfMsg("anontalkpagetext"); }
  90                         else {
  91                                 if($action=="edit") {
  92                                         if($section!="") {
  93                                                 if($section=="new") {
  94                                                         wfProfileOut( $fname );
  95                                                         return "";
  96                                                 }
  97
  98                                                 $secs=preg_split("/(^=+.*?=+|^<h[1-6].*?>.*?<\/h[1-6].*?>)/mi",
  99                                                  $this->mContent, -1,
 100                                                  PREG_SPLIT_DELIM_CAPTURE);
 101                                                 if($section==0) {
 102                                                         wfProfileOut( $fname );
 103                                                         return trim($secs[0]);
 104                                                 } else {
 105                                                         wfProfileOut( $fname );
 106                                                         return trim($secs[$section*2-1] . $secs[$section*2]);
 107                                                 }
 108                                         }
 109                                 }
 110                                 wfProfileOut( $fname );
 111                                 return $this->mContent;
 112                         }
 113                 }
 114         }
 115
 116         # Load the revision (including cur_text) into this object
 117         function loadContent( $noredir = false )
 118         {
 119                 global $wgOut, $wgMwRedir;
 120                 global $oldid, $redirect; # From query
 121
 122                 if ( $this->mContentLoaded ) return;
 123                 $fname = "Article::loadContent";
 124                 $success = true;
 125
 126                 if ( ! $oldid ) {       # Retrieve current version
 127                         $id = $this->getID();
 128                         if ( 0 == $id ) return;
 129
 130                         $sql = "SELECT " .
 131                           "cur_text,cur_timestamp,cur_user,cur_counter,cur_restrictions,cur_touched " .
 132                           "FROM cur WHERE cur_id={$id}";
 133                         wfDebug( "$sql\n" );
 134                         $res = wfQuery( $sql, DB_READ, $fname );
 135                         if ( 0 == wfNumRows( $res ) ) {
 136                                 return;
 137                         }
 138
 139                         $s = wfFetchObject( $res );
 140                         # If we got a redirect, follow it (unless we've been told
 141                         # not to by either the function parameter or the query
 142                         if ( ( "no" != $redirect ) && ( false == $noredir ) &&
 143                           ( $wgMwRedir->matchStart( $s->cur_text ) ) ) {
 144                                 if ( preg_match( "/\\[\\[([^\\]\\|]+)[\\]\\|]/",
 145                                   $s->cur_text, $m ) ) {
 146                                         $rt = Title::newFromText( $m[1] );
 147                                         if( $rt ) {
 148                                                 # Gotta hand redirects to special pages differently:
 149                                                 # Fill the HTTP response "Location" header and ignore
 150                                                 # the rest of the page we're on.
 151
 152                                                 if ( $rt->getInterwiki() != "" ) {
 153                                                         $wgOut->redirect( $rt->getFullURL() ) ;
 154                                                         return;
 155                                                 }
 156                                                 if ( $rt->getNamespace() == Namespace::getSpecial() ) {
 157                                                         $wgOut->redirect( wfLocalUrl(
 158                                                           $rt->getPrefixedURL() ) );
 159                                                         return;
 160                                                 }
 161                                                 $rid = $rt->getArticleID();
 162                                                 if ( 0 != $rid ) {
 163                                                         $sql = "SELECT cur_text,cur_timestamp,cur_user," .
 164                                                           "cur_counter,cur_restrictions,cur_touched FROM cur WHERE cur_id={$rid}";
 165                                                         $res = wfQuery( $sql, DB_READ, $fname );
 166
 167                                                         if ( 0 != wfNumRows( $res ) ) {
 168                                                                 $this->mRedirectedFrom = $this->mTitle->getPrefixedText();
 169                                                                 $this->mTitle = $rt;
 170                                                                 $s = wfFetchObject( $res );
 171                                                         }
 172                                                 }
 173                                         }
 174                                 }
 175                         }
 176
 177                         $this->mContent = $s->cur_text;
 178                         $this->mUser = $s->cur_user;
 179                         $this->mCounter = $s->cur_counter;
 180                         $this->mTimestamp = $s->cur_timestamp;
 181                         $this->mTouched = $s->cur_touched;
 182                         $this->mTitle->mRestrictions = explode( ",", trim( $s->cur_restrictions ) );
 183                         $this->mTitle->mRestrictionsLoaded = true;
 184                         wfFreeResult( $res );
 185                 } else { # oldid set, retrieve historical version
 186                         $sql = "SELECT old_text,old_timestamp,old_user,old_flags FROM old " .
 187                           "WHERE old_id={$oldid}";
 188                         $res = wfQuery( $sql, DB_READ, $fname );
 189                         if ( 0 == wfNumRows( $res ) ) { return; }
 190
 191                         $s = wfFetchObject( $res );
 192                         $this->mContent = Article::getRevisionText( $s );
 193                         $this->mUser = $s->old_user;
 194                         $this->mCounter = 0;
 195                         $this->mTimestamp = $s->old_timestamp;
 196                         wfFreeResult( $res );
 197                 }
 198
 199                 # Return error message :P
 200                 # Horrible, confusing UI and data. I think this should return false on error -- TS
 201                 if ( !$success ) {
 202                         $t = $this->mTitle->getPrefixedText();
 203                         if ( isset( $oldid ) ) {
 204                                 $oldid = IntVal( $oldid );
 205                                 $t .= ",oldid={$oldid}";
 206                         }
 207                         if ( isset( $redirect ) ) {
 208                                 $redirect = ($redirect == "no") ? "no" : "yes";
 209                                 $t .= ",redirect={$redirect}";
 210                         }
 211                         $this->mContent = wfMsg( "missingarticle", $t );
 212                 }
 213
 214                 $this->mContentLoaded = true;
 215         }
 216
 217         function getID() {
 218                 if( $this->mTitle ) {
 219                         return $this->mTitle->getArticleID();
 220                 } else {
 221                         return 0;
 222                 }
 223         }
 224
 225         function getCount()
 226         {
 227                 if ( -1 == $this->mCounter ) {
 228                         $id = $this->getID();
 229                         $this->mCounter = wfGetSQL( "cur", "cur_counter", "cur_id={$id}" );
 230                 }
 231                 return $this->mCounter;
 232         }
 233
 234         # Would the given text make this article a "good" article (i.e.,
 235         # suitable for including in the article count)?
 236
 237         function isCountable( $text )
 238         {
 239                 global $wgUseCommaCount, $wgMwRedir;
 240
 241                 if ( 0 != $this->mTitle->getNamespace() ) { return 0; }
 242                 if ( $wgMwRedir->matchStart( $text ) ) { return 0; }
 243                 $token = ($wgUseCommaCount ? "," : "[[" );
 244                 if ( false === strstr( $text, $token ) ) { return 0; }
 245                 return 1;
 246         }
 247
 248         # Loads everything from cur except cur_text
 249         # This isn't necessary for all uses, so it's only done if needed.
 250
 251         /* private */ function loadLastEdit()
 252         {
 253                 global $wgOut;
 254                 if ( -1 != $this->mUser ) return;
 255
 256                 $sql = "SELECT cur_user,cur_user_text,cur_timestamp," .
 257                   "cur_comment,cur_minor_edit FROM cur WHERE " .
 258                   "cur_id=" . $this->getID();
 259                 $res = wfQuery( $sql, DB_READ, "Article::loadLastEdit" );
 260
 261                 if ( wfNumRows( $res ) > 0 ) {
 262                         $s = wfFetchObject( $res );
 263                         $this->mUser = $s->cur_user;
 264                         $this->mUserText = $s->cur_user_text;
 265                         $this->mTimestamp = $s->cur_timestamp;
 266                         $this->mComment = $s->cur_comment;
 267                         $this->mMinorEdit = $s->cur_minor_edit;
 268                 }
 269         }
 270
 271         function getTimestamp()
 272         {
 273                 $this->loadLastEdit();
 274                 return $this->mTimestamp;
 275         }
 276
 277         function getUser()
 278         {
 279                 $this->loadLastEdit();
 280                 return $this->mUser;
 281         }
 282
 283         function getUserText()
 284         {
 285                 $this->loadLastEdit();
 286                 return $this->mUserText;
 287         }
 288
 289         function getComment()
 290         {
 291                 $this->loadLastEdit();
 292                 return $this->mComment;
 293         }
 294
 295         function getMinorEdit()
 296         {
 297                 $this->loadLastEdit();
 298                 return $this->mMinorEdit;
 299         }
 300
 301         # This is the default action of the script: just view the page of
 302         # the given title.
 303
 304         function view()
 305         {
 306                 global $wgUser, $wgOut, $wgLang;
 307                 global $oldid, $diff; # From query
 308                 global $wgLinkCache, $IP, $wgEnableParserCache;
 309
 310                 $fname = "Article::view";
 311                 wfProfileIn( $fname );
 312
 313                 $wgOut->setArticleFlag( true );
 314                 $wgOut->setRobotpolicy( "index,follow" );
 315
 316                 # If we got diff and oldid in the query, we want to see a
 317                 # diff page instead of the article.
 318
 319                 if ( isset( $diff ) ) {
 320                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 321                         $de = new DifferenceEngine( $oldid, $diff );
 322                         $de->showDiffPage();
 323                         wfProfileOut( $fname );
 324                         return;
 325                 }
 326
 327                 if ( !isset( $oldid ) and $this->checkTouched() ) {
 328                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 329                                 return;
 330                         } else if ( $this->tryFileCache() ) {
 331                                 # tell wgOut that output is taken care of
 332                                 $wgOut->disable();
 333                                 $this->viewUpdates();
 334                                 return;
 335                         }
 336                 }
 337
 338                 $text = $this->getContent(); # May change mTitle
 339                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 340                 $wgOut->setHTMLTitle( $this->mTitle->getPrefixedText() .
 341                   " - " . wfMsg( "wikititlesuffix" ) );
 342
 343                 # We're looking at an old revision
 344
 345                 if ( $oldid ) {
 346                         $this->setOldSubtitle();
 347                         $wgOut->setRobotpolicy( "noindex,follow" );
 348                 }
 349                 if ( "" != $this->mRedirectedFrom ) {
 350                         $sk = $wgUser->getSkin();
 351                         $redir = $sk->makeKnownLink( $this->mRedirectedFrom, "",
 352                           "redirect=no" );
 353                         $s = wfMsg( "redirectedfrom", $redir );
 354                         $wgOut->setSubtitle( $s );
 355                 }
 356
 357                 $wgLinkCache->preFill( $this->mTitle );
 358
 359                 if( $wgEnableParserCache && intval($wgUser->getOption( "stubthreshold" )) == 0 ){
 360                         $wgOut->addWikiText( $text, true, $this );
 361                 } else {
 362                         $wgOut->addWikiText( $text );
 363                 }
 364
 365                 $this->viewUpdates();
 366                 wfProfileOut( $fname );
 367         }
 368
 369         # Theoretically we could defer these whole insert and update
 370         # functions for after display, but that's taking a big leap
 371         # of faith, and we want to be able to report database
 372         # errors at some point.
 373
 374         /* private */ function insertNewArticle( $text, $summary, $isminor, $watchthis )
 375         {
 376                 global $wgOut, $wgUser, $wgLinkCache, $wgMwRedir;
 377                 global $wgUseSquid, $wgDeferredUpdateList, $wgInternalServer;
 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                 $isminor = ( $isminor && $wgUser->getID() ) ? 1 : 0;
 394                 $sql = "INSERT INTO cur (cur_namespace,cur_title,cur_text," .
 395                   "cur_comment,cur_user,cur_timestamp,cur_minor_edit,cur_counter," .
 396                   "cur_restrictions,cur_user_text,cur_is_redirect," .
 397                   "cur_is_new,cur_random,cur_touched,inverse_timestamp) VALUES ({$ns},'" . wfStrencode( $ttl ) . "', '" .
 398                   wfStrencode( $text ) . "', '" .
 399                   wfStrencode( $summary ) . "', '" .
 400                   $wgUser->getID() . "', '{$now}', " .
 401                   $isminor . ", 0, '', '" .
 402                   wfStrencode( $wgUser->getName() ) . "', $redir, 1, $rand, '{$now}', '{$won}')";
 403                 $res = wfQuery( $sql, DB_WRITE, $fname );
 404
 405                 $newid = wfInsertId();
 406                 $this->mTitle->resetArticleID( $newid );
 407
 408                 Article::onArticleCreate( $this->mTitle );
 409                 RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary );
 410
 411                 if ($watchthis) {
 412                         if(!$this->mTitle->userIsWatching()) $this->watch();
 413                 } else {
 414                         if ( $this->mTitle->userIsWatching() ) {
 415                                 $this->unwatch();
 416                         }
 417                 }
 418
 419                 # The talk page isn't in the regular link tables, so we need to update manually:
 420                 $talkns = $ns ^ 1; # talk -> normal; normal -> talk
 421                 $sql = "UPDATE cur set cur_touched='$now' WHERE cur_namespace=$talkns AND cur_title='" . wfStrencode( $ttl ) . "'";
 422                 wfQuery( $sql, DB_WRITE );
 423
 424                 # standard deferred updates
 425                 $this->editUpdates( $text );
 426
 427                 # Squid purging
 428                 if ( $wgUseSquid ) {
 429                         $urlArr = Array(
 430                                 $wgInternalServer.wfLocalUrl( $this->mTitle->getPrefixedURL())
 431                         );
 432                         wfPurgeSquidServers($urlArr);
 433                         /* this needs to be done after LinksUpdate */
 434                         $u = new SquidUpdate($this->mTitle);
 435                         array_push( $wgDeferredUpdateList, $u );
 436                 }
 437
 438                 $this->showArticle( $text, wfMsg( "newarticle" ) );
 439         }
 440
 441         function updateArticle( $text, $summary, $minor, $watchthis, $section = "", $forceBot = false )
 442         {
 443                 global $wgOut, $wgUser, $wgLinkCache;
 444                 global $wgDBtransactions, $wgMwRedir;
 445                 global $wgUseSquid, $wgInternalServer;
 446                 $fname = "Article::updateArticle";
 447
 448                 $this->loadLastEdit();
 449
 450                 // insert updated section into old text if we have only edited part
 451                 // of the article
 452                 if ($section != "") {
 453                         $oldtext=$this->getContent();
 454                         if($section=="new") {
 455                                 if($summary) $subject="== {$summary} ==\n\n";
 456                                 $text=$oldtext."\n\n".$subject.$text;
 457                         } else {
 458                                 $secs=preg_split("/(^=+.*?=+|^<h[1-6].*?>.*?<\/h[1-6].*?>)/mi",
 459                                   $oldtext,-1,PREG_SPLIT_DELIM_CAPTURE);
 460                                 $secs[$section*2]=$text."\n\n"; // replace with edited
 461                                 if($section) { $secs[$section*2-1]=""; } // erase old headline
 462                                 $text=join("",$secs);
 463                         }
 464                 }
 465                 if ( $this->mMinorEdit ) { $me1 = 1; } else { $me1 = 0; }
 466                 if ( $minor && $wgUser->getID() ) { $me2 = 1; } else { $me2 = 0; }
 467                 if ( preg_match( "/^((" . $wgMwRedir->getBaseRegex() . ")[^\\n]+)/i", $text, $m ) ) {
 468                         $redir = 1;
 469                         $text = $m[1] . "\n"; # Remove all content but redirect
 470                 }
 471                 else { $redir = 0; }
 472
 473                 $text = $this->preSaveTransform( $text );
 474
 475                 # Update article, but only if changed.
 476
 477                 if( $wgDBtransactions ) {
 478                         $sql = "BEGIN";
 479                         wfQuery( $sql, DB_WRITE );
 480                 }
 481                 $oldtext = $this->getContent( true );
 482
 483                 if ( 0 != strcmp( $text, $oldtext ) ) {
 484                         $this->mCountAdjustment = $this->isCountable( $text )
 485                           - $this->isCountable( $oldtext );
 486
 487                         $now = wfTimestampNow();
 488                         $won = wfInvertTimestamp( $now );
 489                         $sql = "UPDATE cur SET cur_text='" . wfStrencode( $text ) .
 490                           "',cur_comment='" .  wfStrencode( $summary ) .
 491                           "',cur_minor_edit={$me2}, cur_user=" . $wgUser->getID() .
 492                           ",cur_timestamp='{$now}',cur_user_text='" .
 493                           wfStrencode( $wgUser->getName() ) .
 494                           "',cur_is_redirect={$redir}, cur_is_new=0, cur_touched='{$now}', inverse_timestamp='{$won}' " .
 495                           "WHERE cur_id=" . $this->getID() .
 496                           " AND cur_timestamp='" . $this->getTimestamp() . "'";
 497                         $res = wfQuery( $sql, DB_WRITE, $fname );
 498
 499                         if( wfAffectedRows() == 0 ) {
 500                                 /* Belated edit conflict! Run away!! */
 501                                 return false;
 502                         }
 503
 504                         # This overwrites $oldtext if revision compression is on
 505                         $flags = Article::compressRevisionText( $oldtext );
 506
 507                         $sql = "INSERT INTO old (old_namespace,old_title,old_text," .
 508                           "old_comment,old_user,old_user_text,old_timestamp," .
 509                           "old_minor_edit,inverse_timestamp,old_flags) VALUES (" .
 510                           $this->mTitle->getNamespace() . ", '" .
 511                           wfStrencode( $this->mTitle->getDBkey() ) . "', '" .
 512                           wfStrencode( $oldtext ) . "', '" .
 513                           wfStrencode( $this->getComment() ) . "', " .
 514                           $this->getUser() . ", '" .
 515                           wfStrencode( $this->getUserText() ) . "', '" .
 516                           $this->getTimestamp() . "', " . $me1 . ", '" .
 517                           wfInvertTimestamp( $this->getTimestamp() ) . "','$flags')";
 518                         $res = wfQuery( $sql, DB_WRITE, $fname );
 519                         $oldid = wfInsertID( $res );
 520
 521                         $bot = (int)($wgUser->isBot() || $forceBot);
 522                         RecentChange::notifyEdit( $now, $this->mTitle, $me2, $wgUser, $summary,
 523                                 $oldid, $this->getTimestamp(), $bot );
 524                         Article::onArticleEdit( $this->mTitle );
 525                 }
 526
 527                 if( $wgDBtransactions ) {
 528                         $sql = "COMMIT";
 529                         wfQuery( $sql, DB_WRITE );
 530                 }
 531
 532                 if ($watchthis) {
 533                         if (!$this->mTitle->userIsWatching()) $this->watch();
 534                 } else {
 535                         if ( $this->mTitle->userIsWatching() ) {
 536                                 $this->unwatch();
 537                         }
 538                 }
 539                 # standard deferred updates
 540                 $this->editUpdates( $text );
 541
 542                 # Squid updates
 543
 544                 if ( $wgUseSquid ) {
 545                         $urlArr = Array(
 546                                 $wgInternalServer.wfLocalUrl( $this->mTitle->getPrefixedURL())
 547                         );
 548                         wfPurgeSquidServers($urlArr);
 549                 }
 550
 551                 $this->showArticle( $text, wfMsg( "updated" ) );
 552                 return true;
 553         }
 554
 555         # After we've either updated or inserted the article, update
 556         # the link tables and redirect to the new page.
 557
 558         function showArticle( $text, $subtitle )
 559         {
 560                 global $wgOut, $wgUser, $wgLinkCache;
 561                 global $wgMwRedir;
 562
 563                 $wgLinkCache = new LinkCache();
 564
 565                 # Get old version of link table to allow incremental link updates
 566                 $wgLinkCache->preFill( $this->mTitle );
 567                 $wgLinkCache->clear();
 568
 569                 # Now update the link cache by parsing the text
 570                 $wgOut = new OutputPage();
 571                 $wgOut->addWikiText( $text );
 572
 573                 if( $wgMwRedir->matchStart( $text ) )
 574                         $r = "redirect=no";
 575                 else
 576                         $r = "";
 577                 $wgOut->redirect( wfLocalUrl( $this->mTitle->getPrefixedURL(), $r ) );
 578         }
 579
 580         # Add this page to my watchlist
 581
 582         function watch( $add = true )
 583         {
 584                 global $wgUser, $wgOut, $wgLang;
 585                 global $wgDeferredUpdateList;
 586
 587                 if ( 0 == $wgUser->getID() ) {
 588                         $wgOut->errorpage( "watchnologin", "watchnologintext" );
 589                         return;
 590                 }
 591                 if ( wfReadOnly() ) {
 592                         $wgOut->readOnlyPage();
 593                         return;
 594                 }
 595                 if( $add )
 596                         $wgUser->addWatch( $this->mTitle );
 597                 else
 598                         $wgUser->removeWatch( $this->mTitle );
 599
 600                 $wgOut->setPagetitle( wfMsg( $add ? "addedwatch" : "removedwatch" ) );
 601                 $wgOut->setRobotpolicy( "noindex,follow" );
 602
 603                 $sk = $wgUser->getSkin() ;
 604                 $link = $sk->makeKnownLink ( $this->mTitle->getPrefixedText() ) ;
 605
 606                 if($add)
 607                         $text = wfMsg( "addedwatchtext", $link );
 608                 else
 609                         $text = wfMsg( "removedwatchtext", $link );
 610                 $wgOut->addHTML( $text );
 611
 612                 $up = new UserUpdate();
 613                 array_push( $wgDeferredUpdateList, $up );
 614
 615                 $wgOut->returnToMain( false );
 616         }
 617
 618         function unwatch()
 619         {
 620                 $this->watch( false );
 621         }
 622
 623         function protect( $limit = "sysop" )
 624         {
 625                 global $wgUser, $wgOut;
 626
 627                 if ( ! $wgUser->isSysop() ) {
 628                         $wgOut->sysopRequired();
 629                         return;
 630                 }
 631                 if ( wfReadOnly() ) {
 632                         $wgOut->readOnlyPage();
 633                         return;
 634                 }
 635                 $id = $this->mTitle->getArticleID();
 636                 if ( 0 == $id ) {
 637                         $wgOut->fatalEror( wfMsg( "badarticleerror" ) );
 638                         return;
 639                 }
 640         $sql = "UPDATE cur SET cur_touched='" . wfTimestampNow() . "'," .
 641                         "cur_restrictions='{$limit}' WHERE cur_id={$id}";
 642                 wfQuery( $sql, DB_WRITE, "Article::protect" );
 643
 644                 $log = new LogPage( wfMsg( "protectlogpage" ), wfMsg( "protectlogtext" ) );
 645                 if ( $limit === "" ) {
 646                         $log->addEntry( wfMsg( "unprotectedarticle", $this->mTitle->getPrefixedText() ), "" );
 647                 } else {
 648                         $log->addEntry( wfMsg( "protectedarticle", $this->mTitle->getPrefixedText() ), "" );
 649                 }
 650                 $wgOut->redirect( wfLocalUrl( $this->mTitle->getPrefixedURL() ) );
 651         }
 652
 653         function unprotect()
 654         {
 655                 return $this->protect( "" );
 656         }
 657
 658         function delete()
 659         {
 660                 global $wgUser, $wgOut, $wgMessageCache;
 661                 global $wpConfirm, $wpReason, $image, $oldimage;
 662
 663                 # This code desperately needs to be totally rewritten
 664
 665                 if ( ( ! $wgUser->isSysop() ) ) {
 666                         $wgOut->sysopRequired();
 667                         return;
 668                 }
 669                 if ( wfReadOnly() ) {
 670                         $wgOut->readOnlyPage();
 671                         return;
 672                 }
 673
 674                 # Can't delete cached MediaWiki namespace (i.e. vital messages)
 675                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI && $wgMessageCache->isCacheable( $this->mTitle->getDBkey() ) ) {
 676                         $wgOut->fatalError( wfMsg( "cannotdelete" ) );
 677                         return;
 678                 }
 679
 680                 # Better double-check that it hasn't been deleted yet!
 681                 $wgOut->setPagetitle( wfMsg( "confirmdelete" ) );
 682                 if ( ( "" == trim( $this->mTitle->getText() ) )
 683                   or ( $this->mTitle->getArticleId() == 0 ) ) {
 684                         $wgOut->fatalError( wfMsg( "cannotdelete" ) );
 685                         return;
 686                 }
 687
 688                 if ( $_POST["wpConfirm"] ) {
 689                         $this->doDelete();
 690                         return;
 691                 }
 692
 693                 # determine whether this page has earlier revisions
 694                 # and insert a warning if it does
 695                 # we select the text because it might be useful below
 696                 $ns = $this->mTitle->getNamespace();
 697                 $title = $this->mTitle->getDBkey();
 698                 $etitle = wfStrencode( $title );
 699                 $sql = "SELECT old_text,old_flags FROM old WHERE old_namespace=$ns and old_title='$etitle' ORDER BY inverse_timestamp LIMIT 1";
 700                 $res = wfQuery( $sql, DB_READ, $fname );
 701                 if( ($old=wfFetchObject($res)) && !$wpConfirm ) {
 702                         $skin=$wgUser->getSkin();
 703                         $wgOut->addHTML("<B>".wfMsg("historywarning"));
 704                         $wgOut->addHTML( $skin->historyLink() ."</B><P>");
 705                 }
 706
 707                 $sql="SELECT cur_text FROM cur WHERE cur_namespace=$ns and cur_title='$etitle'";
 708                 $res=wfQuery($sql, DB_READ, $fname);
 709                 if( ($s=wfFetchObject($res))) {
 710
 711                         # if this is a mini-text, we can paste part of it into the deletion reason
 712
 713                         #if this is empty, an earlier revision may contain "useful" text
 714                         if($s->cur_text!="") {
 715                                 $text=$s->cur_text;
 716                         } else {
 717                                 if($old) {
 718                                         $text = Article::getRevisionText( $old );
 719                                         $blanked=1;
 720                                 }
 721
 722                         }
 723
 724                         $length=strlen($text);
 725
 726                         # this should not happen, since it is not possible to store an empty, new
 727                         # page. Let's insert a standard text in case it does, though
 728                         if($length==0 && !$wpReason) { $wpReason=wfmsg("exblank");}
 729
 730
 731                         if($length < 500 && !$wpReason) {
 732
 733                                 # comment field=255, let's grep the first 150 to have some user
 734                                 # space left
 735                                 $text=substr($text,0,150);
 736                                 # let's strip out newlines and HTML tags
 737                                 $text=preg_replace("/\"/","'",$text);
 738                                 $text=preg_replace("/\</","&lt;",$text);
 739                                 $text=preg_replace("/\>/","&gt;",$text);
 740                                 $text=preg_replace("/[\n\r]/","",$text);
 741                                 if(!$blanked) {
 742                                         $wpReason=wfMsg("excontent"). " '".$text;
 743                                 } else {
 744                                         $wpReason=wfMsg("exbeforeblank") . " '".$text;
 745                                 }
 746                                 if($length>150) { $wpReason .= "..."; } # we've only pasted part of the text
 747                                 $wpReason.="'";
 748                         }
 749                 }
 750
 751                 return $this->confirmDelete();
 752         }
 753
 754         function confirmDelete( $par = "" )
 755         {
 756                 global $wgOut;
 757                 global $wpReason;
 758
 759                 wfDebug( "Article::confirmDelete\n" );
 760
 761                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
 762                 $wgOut->setSubtitle( wfMsg( "deletesub", $sub ) );
 763                 $wgOut->setRobotpolicy( "noindex,nofollow" );
 764                 $wgOut->addWikiText( wfMsg( "confirmdeletetext" ) );
 765
 766                 $t = $this->mTitle->getPrefixedURL();
 767
 768                 $formaction = wfEscapeHTML( wfLocalUrl( $t, "action=delete" . $par ) );
 769                 $confirm = wfMsg( "confirm" );
 770                 $check = wfMsg( "confirmcheck" );
 771                 $delcom = wfMsg( "deletecomment" );
 772
 773                 $wgOut->addHTML( "
 774 <form id=\"deleteconfirm\" method=\"post\" action=\"{$formaction}\">
 775 <table border=0><tr><td align=right>
 776 {$delcom}:</td><td align=left>
 777 <input type=text size=60 name=\"wpReason\" value=\"" . htmlspecialchars( $wpReason ) . "\">
 778 </td></tr><tr><td>&nbsp;</td></tr>
 779 <tr><td align=right>
 780 <input type=checkbox name=\"wpConfirm\" value='1' id=\"wpConfirm\">
 781 </td><td><label for=\"wpConfirm\">{$check}</label></td>
 782 </tr><tr><td>&nbsp;</td><td>
 783 <input type=submit name=\"wpConfirmB\" value=\"{$confirm}\">
 784 </td></tr></table></form>\n" );
 785
 786                 $wgOut->returnToMain( false );
 787         }
 788
 789         function doDelete()
 790         {
 791                 global $wgOut, $wgUser, $wgLang;
 792                 global $wpReason;
 793                 $fname = "Article::doDelete";
 794                 wfDebug( "$fname\n" );
 795
 796                 $this->doDeleteArticle( $this->mTitle );
 797                 $deleted = $this->mTitle->getPrefixedText();
 798
 799                 $wgOut->setPagetitle( wfMsg( "actioncomplete" ) );
 800                 $wgOut->setRobotpolicy( "noindex,nofollow" );
 801
 802                 $sk = $wgUser->getSkin();
 803                 $loglink = $sk->makeKnownLink( $wgLang->getNsText(
 804                   Namespace::getWikipedia() ) .
 805                   ":" . wfMsg( "dellogpage" ), wfMsg( "deletionlog" ) );
 806
 807                 $text = wfMsg( "deletedtext", $deleted, $loglink );
 808
 809                 $wgOut->addHTML( "<p>" . $text );
 810                 $wgOut->returnToMain( false );
 811         }
 812
 813         function doDeleteArticle( $title )
 814         {
 815                 global $wgUser, $wgOut, $wgLang, $wpReason;
 816                 global  $wgUseSquid, $wgDeferredUpdateList, $wgInternalServer;
 817
 818                 $fname = "Article::doDeleteArticle";
 819                 wfDebug( "$fname\n" );
 820
 821                 $ns = $title->getNamespace();
 822                 $t = wfStrencode( $title->getDBkey() );
 823                 $id = $title->getArticleID();
 824
 825                 if ( "" == $t ) {
 826                         $wgOut->fatalError( wfMsg( "cannotdelete" ) );
 827                         return;
 828                 }
 829
 830                 $u = new SiteStatsUpdate( 0, 1, -$this->isCountable( $this->getContent( true ) ) );
 831                 array_push( $wgDeferredUpdateList, $u );
 832
 833                 # Squid purging
 834                 if ( $wgUseSquid ) {
 835                         $urlArr = Array(
 836                                 $wgInternalServer.wfLocalUrl( $this->mTitle->getPrefixedURL())
 837                         );
 838                         wfPurgeSquidServers($urlArr);
 839
 840                         /* prepare the list of urls to purge */
 841                         $sql = "SELECT l_from FROM links WHERE l_to={$id}" ;
 842                         $res = wfQuery ( $sql, DB_READ ) ;
 843                         while ( $BL = wfFetchObject ( $res ) )
 844                         {
 845                                 $tobj = Title::newFromDBkey( $BL->l_from) ;
 846                                 $blurlArr[] = $wgInternalServer.wfLocalUrl( $tobj->getPrefixedURL() );
 847                         }
 848                         wfFreeResult ( $res ) ;
 849                         $u = new SquidUpdate( $this->mTitle, $blurlArr );
 850                         array_push( $wgDeferredUpdateList, $u );
 851
 852                 }
 853
 854
 855
 856                 # Move article and history to the "archive" table
 857                 $sql = "INSERT INTO archive (ar_namespace,ar_title,ar_text," .
 858                   "ar_comment,ar_user,ar_user_text,ar_timestamp,ar_minor_edit," .
 859                   "ar_flags) SELECT cur_namespace,cur_title,cur_text,cur_comment," .
 860                   "cur_user,cur_user_text,cur_timestamp,cur_minor_edit,0 FROM cur " .
 861                   "WHERE cur_namespace={$ns} AND cur_title='{$t}'";
 862                 wfQuery( $sql, DB_WRITE, $fname );
 863
 864                 $sql = "INSERT INTO archive (ar_namespace,ar_title,ar_text," .
 865                   "ar_comment,ar_user,ar_user_text,ar_timestamp,ar_minor_edit," .
 866                   "ar_flags) SELECT old_namespace,old_title,old_text,old_comment," .
 867                   "old_user,old_user_text,old_timestamp,old_minor_edit,old_flags " .
 868                   "FROM old WHERE old_namespace={$ns} AND old_title='{$t}'";
 869                 wfQuery( $sql, DB_WRITE, $fname );
 870
 871                 # Now that it's safely backed up, delete it
 872
 873                 $sql = "DELETE FROM cur WHERE cur_namespace={$ns} AND " .
 874                   "cur_title='{$t}'";
 875                 wfQuery( $sql, DB_WRITE, $fname );
 876
 877                 $sql = "DELETE FROM old WHERE old_namespace={$ns} AND " .
 878                   "old_title='{$t}'";
 879                 wfQuery( $sql, DB_WRITE, $fname );
 880
 881                 $sql = "DELETE FROM recentchanges WHERE rc_namespace={$ns} AND " .
 882                   "rc_title='{$t}'";
 883                 wfQuery( $sql, DB_WRITE, $fname );
 884
 885                 # Finally, clean up the link tables
 886
 887                 if ( 0 != $id ) {
 888
 889                         $t = wfStrencode( $title->getPrefixedDBkey() );
 890
 891                         Article::onArticleDelete( $title );
 892
 893                         $sql = "SELECT l_from FROM links WHERE l_to={$id}";
 894                         $res = wfQuery( $sql, DB_READ, $fname );
 895
 896                         $sql = "INSERT INTO brokenlinks (bl_from,bl_to) VALUES ";
 897                         $now = wfTimestampNow();
 898                         $sql2 = "UPDATE cur SET cur_touched='{$now}' WHERE cur_id IN (";
 899                         $first = true;
 900
 901                         while ( $s = wfFetchObject( $res ) ) {
 902                                 $nt = Title::newFromDBkey( $s->l_from );
 903                                 $lid = $nt->getArticleID();
 904
 905                                 if ( ! $first ) { $sql .= ","; $sql2 .= ","; }
 906                                 $first = false;
 907                                 $sql .= "({$lid},'{$t}')";
 908                                 $sql2 .= "{$lid}";
 909                         }
 910                         $sql2 .= ")";
 911                         if ( ! $first ) {
 912                                 wfQuery( $sql, DB_WRITE, $fname );
 913                                 wfQuery( $sql2, DB_WRITE, $fname );
 914                         }
 915                         wfFreeResult( $res );
 916
 917                         $sql = "DELETE FROM links WHERE l_to={$id}";
 918                         wfQuery( $sql, DB_WRITE, $fname );
 919
 920                         $sql = "DELETE FROM links WHERE l_from='{$t}'";
 921                         wfQuery( $sql, DB_WRITE, $fname );
 922
 923                         $sql = "DELETE FROM imagelinks WHERE il_from='{$t}'";
 924                         wfQuery( $sql, DB_WRITE, $fname );
 925
 926                         $sql = "DELETE FROM brokenlinks WHERE bl_from={$id}";
 927                         wfQuery( $sql, DB_WRITE, $fname );
 928                 }
 929
 930                 $log = new LogPage( wfMsg( "dellogpage" ), wfMsg( "dellogpagetext" ) );
 931                 $art = $title->getPrefixedText();
 932                 $wpReason = wfCleanQueryVar( $wpReason );
 933                 $log->addEntry( wfMsg( "deletedarticle", $art ), $wpReason );
 934
 935                 # Clear the cached article id so the interface doesn't act like we exist
 936                 $this->mTitle->resetArticleID( 0 );
 937                 $this->mTitle->mArticleID = 0;
 938         }
 939
 940         function rollback()
 941         {
 942                 global $wgUser, $wgLang, $wgOut, $from;
 943
 944                 if ( ! $wgUser->isSysop() ) {
 945                         $wgOut->sysopRequired();
 946                         return;
 947                 }
 948                 if ( wfReadOnly() ) {
 949                         $wgOut->readOnlyPage( $this->getContent() );
 950                         return;
 951                 }
 952
 953                 # Enhanced rollback, marks edits rc_bot=1
 954                 $bot = !!$_REQUEST['bot'];
 955
 956                 # Replace all this user's current edits with the next one down
 957                 $tt = wfStrencode( $this->mTitle->getDBKey() );
 958                 $n = $this->mTitle->getNamespace();
 959
 960                 # Get the last editor
 961                 $sql = "SELECT cur_id,cur_user,cur_user_text,cur_comment FROM cur WHERE cur_title='{$tt}' AND cur_namespace={$n}";
 962                 $res = wfQuery( $sql, DB_READ );
 963                 if( ($x = wfNumRows( $res )) != 1 ) {
 964                         # Something wrong
 965                         $wgOut->addHTML( wfMsg( "notanarticle" ) );
 966                         return;
 967                 }
 968                 $s = wfFetchObject( $res );
 969                 $ut = wfStrencode( $s->cur_user_text );
 970                 $uid = $s->cur_user;
 971                 $pid = $s->cur_id;
 972
 973                 $from = str_replace( '_', ' ', wfCleanQueryVar( $from ) );
 974                 if( $from != $s->cur_user_text ) {
 975                         $wgOut->setPageTitle(wfmsg("rollbackfailed"));
 976                         $wgOut->addWikiText( wfMsg( "alreadyrolled",
 977                                 htmlspecialchars( $this->mTitle->getPrefixedText()),
 978                                 htmlspecialchars( $from ),
 979                                 htmlspecialchars( $s->cur_user_text ) ) );
 980                         if($s->cur_comment != "") {
 981                                 $wgOut->addHTML(
 982                                         wfMsg("editcomment",
 983                                         htmlspecialchars( $s->cur_comment ) ) );
 984                         }
 985                         return;
 986                 }
 987
 988                 # Get the last edit not by this guy
 989                 $sql = "SELECT old_text,old_user,old_user_text,old_timestamp,old_flags
 990                 FROM old USE INDEX (name_title_timestamp)
 991                 WHERE old_namespace={$n} AND old_title='{$tt}'
 992                 AND (old_user <> {$uid} OR old_user_text <> '{$ut}')
 993                 ORDER BY inverse_timestamp LIMIT 1";
 994                 $res = wfQuery( $sql, DB_READ );
 995                 if( wfNumRows( $res ) != 1 ) {
 996                         # Something wrong
 997                         $wgOut->setPageTitle(wfMsg("rollbackfailed"));
 998                         $wgOut->addHTML( wfMsg( "cantrollback" ) );
 999                         return;
1000                 }
1001                 $s = wfFetchObject( $res );
1002
1003                 if ( $bot ) {
1004                         # Mark all reverted edits as bot
1005                         $sql = "UPDATE recentchanges SET rc_bot=1 WHERE
1006                                 rc_cur_id=$pid AND rc_user=$uid AND rc_timestamp > '{$s->old_timestamp}'";
1007                         wfQuery( $sql, DB_WRITE, $fname );
1008                 }
1009
1010                 # Save it!
1011                 $newcomment = wfMsg( "revertpage", $s->old_user_text, $from );
1012                 $wgOut->setPagetitle( wfMsg( "actioncomplete" ) );
1013                 $wgOut->setRobotpolicy( "noindex,nofollow" );
1014                 $wgOut->addHTML( "<h2>" . $newcomment . "</h2>\n<hr>\n" );
1015                 $this->updateArticle( Article::getRevisionText( $s ), $newcomment, 1, $this->mTitle->userIsWatching(), "", $bot );
1016
1017                 Article::onArticleEdit( $this->mTitle );
1018                 $wgOut->returnToMain( false );
1019         }
1020
1021
1022         # Do standard deferred updates after page view
1023
1024         /* private */ function viewUpdates()
1025         {
1026                 global $wgDeferredUpdateList;
1027                 if ( 0 != $this->getID() ) {
1028                         global $wgDisableCounters;
1029                         if( !$wgDisableCounters ) {
1030                                 Article::incViewCount( $this->getID() );
1031                                 $u = new SiteStatsUpdate( 1, 0, 0 );
1032                                 array_push( $wgDeferredUpdateList, $u );
1033                         }
1034                         $u = new UserTalkUpdate( 0, $this->mTitle->getNamespace(),
1035                           $this->mTitle->getDBkey() );
1036                         array_push( $wgDeferredUpdateList, $u );
1037                 }
1038         }
1039
1040         # Do standard deferred updates after page edit.
1041         # Every 1000th edit, prune the recent changes table.
1042
1043         /* private */ function editUpdates( $text )
1044         {
1045                 global $wgDeferredUpdateList, $wgDBname, $wgMemc;
1046                 global $wgMessageCache;
1047
1048                 wfSeedRandom();
1049                 if ( 0 == mt_rand( 0, 999 ) ) {
1050                         $cutoff = wfUnix2Timestamp( time() - ( 7 * 86400 ) );
1051                         $sql = "DELETE FROM recentchanges WHERE rc_timestamp < '{$cutoff}'";
1052                         wfQuery( $sql, DB_WRITE );
1053                 }
1054                 $id = $this->getID();
1055                 $title = $this->mTitle->getPrefixedDBkey();
1056                 $shortTitle = $this->mTitle->getDBkey();
1057
1058                 $adj = $this->mCountAdjustment;
1059
1060                 if ( 0 != $id ) {
1061                         $u = new LinksUpdate( $id, $title );
1062                         array_push( $wgDeferredUpdateList, $u );
1063                         $u = new SiteStatsUpdate( 0, 1, $adj );
1064                         array_push( $wgDeferredUpdateList, $u );
1065                         $u = new SearchUpdate( $id, $title, $text );
1066                         array_push( $wgDeferredUpdateList, $u );
1067
1068                         $u = new UserTalkUpdate( 1, $this->mTitle->getNamespace(), $shortTitle );
1069                         array_push( $wgDeferredUpdateList, $u );
1070
1071                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1072                                 $wgMessageCache->replace( $shortTitle, $text );
1073                         }
1074                 }
1075         }
1076
1077         /* private */ function setOldSubtitle()
1078         {
1079                 global $wgLang, $wgOut;
1080
1081                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
1082                 $r = wfMsg( "revisionasof", $td );
1083                 $wgOut->setSubtitle( "({$r})" );
1084         }
1085
1086         # This function is called right before saving the wikitext,
1087         # so we can do things like signatures and links-in-context.
1088
1089         function preSaveTransform( $text )
1090         {
1091                 $s = "";
1092                 while ( "" != $text ) {
1093                         $p = preg_split( "/<\\s*nowiki\\s*>/i", $text, 2 );
1094                         $s .= $this->pstPass2( $p[0] );
1095
1096                         if ( ( count( $p ) < 2 ) || ( "" == $p[1] ) ) { $text = ""; }
1097                         else {
1098                                 $q = preg_split( "/<\\/\\s*nowiki\\s*>/i", $p[1], 2 );
1099                                 $s .= "<nowiki>{$q[0]}</nowiki>";
1100                                 $text = $q[1];
1101                         }
1102                 }
1103                 return rtrim( $s );
1104         }
1105
1106         /* private */ function pstPass2( $text )
1107         {
1108                 global $wgUser, $wgLang, $wgLocaltimezone;
1109
1110                 # Signatures
1111                 #
1112                 $n = $wgUser->getName();
1113                 $k = $wgUser->getOption( "nickname" );
1114                 if ( "" == $k ) { $k = $n; }
1115                 if(isset($wgLocaltimezone)) {
1116                         $oldtz = getenv("TZ"); putenv("TZ=$wgLocaltimezone");
1117                 }
1118                 /* Note: this is an ugly timezone hack for the European wikis */
1119                 $d = $wgLang->timeanddate( date( "YmdHis" ), false ) .
1120                   " (" . date( "T" ) . ")";
1121                 if(isset($wgLocaltimezone)) putenv("TZ=$oldtz");
1122
1123                 $text = preg_replace( "/~~~~/", "[[" . $wgLang->getNsText(
1124                   Namespace::getUser() ) . ":$n|$k]] $d", $text );
1125                 $text = preg_replace( "/~~~/", "[[" . $wgLang->getNsText(
1126                   Namespace::getUser() ) . ":$n|$k]]", $text );
1127
1128                 # Context links: [[|name]] and [[name (context)|]]
1129                 #
1130                 $tc = "[&;%\\-,.\\(\\)' _0-9A-Za-z\\/:\\x80-\\xff]";
1131                 $np = "[&;%\\-,.' _0-9A-Za-z\\/:\\x80-\\xff]"; # No parens
1132                 $namespacechar = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
1133                 $conpat = "/^({$np}+) \\(({$tc}+)\\)$/";
1134
1135                 $p1 = "/\[\[({$np}+) \\(({$np}+)\\)\\|]]/";             # [[page (context)|]]
1136                 $p2 = "/\[\[\\|({$tc}+)]]/";                                    # [[|page]]
1137                 $p3 = "/\[\[($namespacechar+):({$np}+)\\|]]/";          # [[namespace:page|]]
1138                 $p4 = "/\[\[($namespacechar+):({$np}+) \\(({$np}+)\\)\\|]]/";
1139                                                                                                                 # [[ns:page (cont)|]]
1140                 $context = "";
1141                 $t = $this->mTitle->getText();
1142                 if ( preg_match( $conpat, $t, $m ) ) {
1143                         $context = $m[2];
1144                 }
1145                 $text = preg_replace( $p4, "[[\\1:\\2 (\\3)|\\2]]", $text );
1146                 $text = preg_replace( $p1, "[[\\1 (\\2)|\\1]]", $text );
1147                 $text = preg_replace( $p3, "[[\\1:\\2|\\2]]", $text );
1148
1149                 if ( "" == $context ) {
1150                         $text = preg_replace( $p2, "[[\\1]]", $text );
1151                 } else {
1152                         $text = preg_replace( $p2, "[[\\1 ({$context})|\\1]]", $text );
1153                 }
1154
1155                 # {{SUBST:xxx}} variables
1156                 #
1157                 $mw =& MagicWord::get( MAG_SUBST );
1158                 $text = $mw->substituteCallback( $text, "wfReplaceSubstVar" );
1159
1160 /* Experimental:
1161                 # Trim trailing whitespace
1162                 # MAG_END (__END__) tag allows for trailing
1163                 # whitespace to be deliberately included
1164                 $text = rtrim( $text );
1165                 $mw =& MagicWord::get( MAG_END );
1166                 $mw->matchAndRemove( $text );
1167 */
1168                 return $text;
1169         }
1170
1171         /* Caching functions */
1172
1173         # checkLastModified returns true iff it has taken care of all
1174         # output to the client that is necessary for this request.
1175         # (that is, it has sent a cached version of the page)
1176         function tryFileCache() {
1177                 static $called = false;
1178                 if( $called ) {
1179                         wfDebug( " tryFileCache() -- called twice!?\n" );
1180                         return;
1181                 }
1182                 $called = true;
1183                 if($this->isFileCacheable()) {
1184                         $touched = $this->mTouched;
1185                         if( $this->mTitle->getPrefixedDBkey() == wfMsg( "mainpage" ) ) {
1186                                 # Expire the main page quicker
1187                                 $expire = wfUnix2Timestamp( time() - 3600 );
1188                                 $touched = max( $expire, $touched );
1189                         }
1190                         $cache = new CacheManager( $this->mTitle );
1191                         if($cache->isFileCacheGood( $touched )) {
1192                                 global $wgOut;
1193                                 wfDebug( " tryFileCache() - about to load\n" );
1194                                 $cache->loadFromFileCache();
1195                                 return true;
1196                         } else {
1197                                 wfDebug( " tryFileCache() - starting buffer\n" );
1198                                 ob_start( array(&$cache, 'saveToFileCache' ) );
1199                         }
1200                 } else {
1201                         wfDebug( " tryFileCache() - not cacheable\n" );
1202                 }
1203         }
1204
1205         function isFileCacheable() {
1206                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader;
1207                 global $action, $oldid, $diff, $redirect, $printable;
1208                 return $wgUseFileCache
1209                         and (!$wgShowIPinHeader)
1210                         and ($this->getID() != 0)
1211                         and ($wgUser->getId() == 0)
1212                         and (!$wgUser->getNewtalk())
1213                         and ($this->mTitle->getNamespace() != Namespace::getSpecial())
1214                         and ($action == "view")
1215                         and (!isset($oldid))
1216                         and (!isset($diff))
1217                         and (!isset($redirect))
1218                         and (!isset($printable))
1219                         and (!$this->mRedirectedFrom);
1220         }
1221
1222         function checkTouched() {
1223                 $id = $this->getID();
1224                 $sql = "SELECT cur_touched,cur_is_redirect FROM cur WHERE cur_id=$id";
1225                 $res = wfQuery( $sql, DB_READ, "Article::checkTouched" );
1226                 if( $s = wfFetchObject( $res ) ) {
1227                         $this->mTouched = $s->cur_touched;
1228                         return !$s->cur_is_redirect;
1229                 } else {
1230                         return false;
1231                 }
1232         }
1233
1234         /* static */ function incViewCount( $id )
1235         {
1236                 $id = intval( $id );
1237                 global $wgHitcounterUpdateFreq;
1238
1239                 if( $wgHitcounterUpdateFreq <= 1 ){ //
1240                         wfQuery("UPDATE cur SET cur_counter = cur_counter + 1 " .
1241                                 "WHERE cur_id = $id", DB_WRITE);
1242                         return;
1243                 }
1244
1245                 # Not important enough to warrant an error page in case of failure
1246                 $oldignore = wfIgnoreSQLErrors( true );
1247
1248                 wfQuery("INSERT INTO hitcounter (hc_id) VALUES ({$id})", DB_WRITE);
1249
1250                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
1251                 if( (rand() % $checkfreq != 0) or (wfLastErrno() != 0) ){
1252                         # Most of the time (or on SQL errors), skip row count check
1253                         wfIgnoreSQLErrors( $oldignore );
1254                         return;
1255                 }
1256
1257                 $res = wfQuery("SELECT COUNT(*) as n FROM hitcounter", DB_WRITE);
1258                 $row = wfFetchObject( $res );
1259                 $rown = intval( $row->n );
1260                 if( $rown >= $wgHitcounterUpdateFreq ){
1261                         wfProfileIn( "Article::incViewCount-collect" );
1262                         $old_user_abort = ignore_user_abort( true );
1263
1264                         wfQuery("LOCK TABLES hitcounter WRITE", DB_WRITE);
1265                         wfQuery("CREATE TEMPORARY TABLE acchits TYPE=HEAP ".
1266                                 "SELECT hc_id,COUNT(*) AS hc_n FROM hitcounter ".
1267                                 "GROUP BY hc_id", DB_WRITE);
1268                         wfQuery("DELETE FROM hitcounter", DB_WRITE);
1269                         wfQuery("UNLOCK TABLES", DB_WRITE);
1270                         wfQuery("UPDATE cur,acchits SET cur_counter=cur_counter + hc_n ".
1271                                 "WHERE cur_id = hc_id", DB_WRITE);
1272                         wfQuery("DROP TABLE acchits", DB_WRITE);
1273
1274                         ignore_user_abort( $old_user_abort );
1275                         wfProfileOut( "Article::incViewCount-collect" );
1276                 }
1277                 wfIgnoreSQLErrors( $oldignore );
1278         }
1279
1280         # The onArticle*() functions are supposed to be a kind of hooks
1281         # which should be called whenever any of the specified actions
1282         # are done.
1283         #
1284         # This is a good place to put code to clear caches, for instance.
1285
1286         /* static */ function onArticleCreate($title_obj){
1287                 global $wgEnablePersistentLC, $wgEnableParserCache;
1288                 if ( $wgEnablePersistentLC ) {
1289                         LinkCache::linksccClearBrokenLinksTo( $title_obj->getPrefixedDBkey() );
1290                 }
1291                 if ( $wgEnableParserCache ) {
1292                         OutputPage::parsercacheClearBrokenLinksTo( $title_obj->getPrefixedDBkey() );
1293                 }
1294         }
1295
1296         /* static */ function onArticleDelete($title_obj){
1297                 global $wgEnablePersistentLC, $wgEnableParserCache;
1298                 if ( $wgEnablePersistentLC ) {
1299                         LinkCache::linksccClearLinksTo( $title_obj->getArticleID() );
1300                 }
1301                 if ( $wgEnableParserCache ) {
1302                         OutputPage::parsercacheClearLinksTo( $title_obj->getArticleID() );
1303                 }
1304         }
1305
1306         /* static */ function onArticleEdit($title_obj){
1307                 global $wgEnablePersistentLC, $wgEnableParserCache;
1308                 if ( $wgEnablePersistentLC ) {
1309                         LinkCache::linksccClearPage( $title_obj->getArticleID() );
1310                 }
1311                 if ( $wgEnableParserCache ) {
1312                         OutputPage::parsercacheClearPage( $title_obj->getArticleID(), $title_obj->getNamespace() );
1313                 }
1314         }
1315 }
1316
1317 function wfReplaceSubstVar( $matches ) {
1318         return wfMsg( $matches[1] );
1319 }
1320
1321 ?>