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, $mTitle;
  23
  24         function Article( &$title ) {
  25                 $this->mTitle =& $title;
  26                 $this->clear();
  27         }
  28
  29         /* private */ function clear()
  30         {
  31                 $this->mContentLoaded = false;
  32                 $this->mUser = $this->mCounter = -1; # Not loaded
  33                 $this->mRedirectedFrom = $this->mUserText =
  34                 $this->mTimestamp = $this->mComment = $this->mFileCache = "";
  35                 $this->mCountAdjustment = 0;
  36                 $this->mTouched = "19700101000000";
  37         }
  38
  39         # Note that getContent/loadContent may follow redirects if
  40         # not told otherwise, and so may cause a change to mTitle.
  41
  42         function getContent( $noredir = false )
  43         {
  44                 global $action,$section,$count; # From query string
  45                 $fname =  "Article::getContent";
  46                 wfProfileIn( $fname );
  47
  48                 if ( 0 == $this->getID() ) {
  49                         if ( "edit" == $action ) {
  50                                 wfProfileOut( $fname );
  51                                 return ""; # was "newarticletext", now moved above the box)
  52                         }
  53                         wfProfileOut( $fname );
  54                         return wfMsg( "noarticletext" );
  55                 } else {
  56                         $this->loadContent( $noredir );
  57
  58                         if(
  59                                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
  60                                 ( $this->mTitle->getNamespace() == Namespace::getTalk( Namespace::getUser()) ) &&
  61                                   preg_match("/^\d{1,3}\.\d{1,3}.\d{1,3}\.\d{1,3}$/",$this->mTitle->getText()) &&
  62                                   $action=="view"
  63                                 )
  64                                 {
  65                                 wfProfileOut( $fname );
  66                                 return $this->mContent . "\n" .wfMsg("anontalkpagetext"); }
  67                         else {
  68                                 if($action=="edit") {
  69                                         if($section!="") {
  70                                                 if($section=="new") {
  71                                                         wfProfileOut( $fname );
  72                                                         return "";
  73                                                 }
  74
  75                                                 $secs=preg_split("/(^=+.*?=+|^<h[1-6].*?>.*?<\/h[1-6].*?>)/mi",
  76                                                  $this->mContent, -1,
  77                                                  PREG_SPLIT_DELIM_CAPTURE);
  78                                                 if($section==0) {
  79                                                         wfProfileOut( $fname );
  80                                                         return trim($secs[0]);
  81                                                 } else {
  82                                                         wfProfileOut( $fname );
  83                                                         return trim($secs[$section*2-1] . $secs[$section*2]);
  84                                                 }
  85                                         }
  86                                 }
  87                                 wfProfileOut( $fname );
  88                                 return $this->mContent;
  89                         }
  90                 }
  91         }
  92
  93         function loadContent( $noredir = false )
  94         {
  95                 global $wgOut, $wgMwRedir;
  96                 global $oldid, $redirect; # From query
  97
  98                 if ( $this->mContentLoaded ) return;
  99                 $fname = "Article::loadContent";
 100
 101                 # Pre-fill content with error message so that if something
 102                 # fails we'll have something telling us what we intended.
 103
 104                 $t = $this->mTitle->getPrefixedText();
 105                 if ( isset( $oldid ) ) {
 106                         $oldid = IntVal( $oldid );
 107                         $t .= ",oldid={$oldid}";
 108                 }
 109                 if ( isset( $redirect ) ) {
 110                         $redirect = ($redirect == "no") ? "no" : "yes";
 111                         $t .= ",redirect={$redirect}";
 112                 }
 113                 $this->mContent = wfMsg( "missingarticle", $t );
 114
 115                 if ( ! $oldid ) {       # Retrieve current version
 116                         $id = $this->getID();
 117                         if ( 0 == $id ) return;
 118
 119                         $sql = "SELECT " .
 120                           "cur_text,cur_timestamp,cur_user,cur_counter,cur_restrictions,cur_touched " .
 121                           "FROM cur WHERE cur_id={$id}";
 122                         wfDebug( "$sql\n" );
 123                         $res = wfQuery( $sql, DB_READ, $fname );
 124                         if ( 0 == wfNumRows( $res ) ) {
 125                                 return;
 126                         }
 127
 128                         $s = wfFetchObject( $res );
 129                         # If we got a redirect, follow it (unless we've been told
 130                         # not to by either the function parameter or the query
 131                         if ( ( "no" != $redirect ) && ( false == $noredir ) &&
 132                           ( $wgMwRedir->matchStart( $s->cur_text ) ) ) {
 133                                 if ( preg_match( "/\\[\\[([^\\]\\|]+)[\\]\\|]/",
 134                                   $s->cur_text, $m ) ) {
 135                                         $rt = Title::newFromText( $m[1] );
 136
 137                                         # Gotta hand redirects to special pages differently:
 138                                         # Fill the HTTP response "Location" header and ignore
 139                                         # the rest of the page we're on.
 140
 141                                         if ( $rt->getInterwiki() != "" ) {
 142                                                 $wgOut->redirect( $rt->getFullURL() ) ;
 143                                                 return;
 144                                         }
 145                                         if ( $rt->getNamespace() == Namespace::getSpecial() ) {
 146                                                 $wgOut->redirect( wfLocalUrl(
 147                                                   $rt->getPrefixedURL() ) );
 148                                                 return;
 149                                         }
 150                                         $rid = $rt->getArticleID();
 151                                         if ( 0 != $rid ) {
 152                                                 $sql = "SELECT cur_text,cur_timestamp,cur_user," .
 153                                                   "cur_counter,cur_restrictions,cur_touched FROM cur WHERE cur_id={$rid}";
 154                                                 $res = wfQuery( $sql, DB_READ, $fname );
 155
 156                                                 if ( 0 != wfNumRows( $res ) ) {
 157                                                         $this->mRedirectedFrom = $this->mTitle->getPrefixedText();
 158                                                         $this->mTitle = $rt;
 159                                                         $s = wfFetchObject( $res );
 160                                                 }
 161                                         }
 162                                 }
 163                         }
 164
 165                         $this->mContent = $s->cur_text;
 166                         $this->mUser = $s->cur_user;
 167                         $this->mCounter = $s->cur_counter;
 168                         $this->mTimestamp = $s->cur_timestamp;
 169                         $this->mTouched = $s->cur_touched;
 170                         $this->mTitle->mRestrictions = explode( ",", trim( $s->cur_restrictions ) );
 171                         $this->mTitle->mRestrictionsLoaded = true;
 172                         wfFreeResult( $res );
 173                 } else { # oldid set, retrieve historical version
 174                         $sql = "SELECT old_text,old_timestamp,old_user FROM old " .
 175                           "WHERE old_id={$oldid}";
 176                         $res = wfQuery( $sql, DB_READ, $fname );
 177                         if ( 0 == wfNumRows( $res ) ) { return; }
 178
 179                         $s = wfFetchObject( $res );
 180                         $this->mContent = $s->old_text;
 181                         $this->mUser = $s->old_user;
 182                         $this->mCounter = 0;
 183                         $this->mTimestamp = $s->old_timestamp;
 184                         wfFreeResult( $res );
 185                 }
 186                 $this->mContentLoaded = true;
 187         }
 188
 189         function getID() {
 190                 if( $this->mTitle ) {
 191                         return $this->mTitle->getArticleID();
 192                 } else {
 193                         return 0;
 194                 }
 195         }
 196
 197         function getCount()
 198         {
 199                 if ( -1 == $this->mCounter ) {
 200                         $id = $this->getID();
 201                         $this->mCounter = wfGetSQL( "cur", "cur_counter", "cur_id={$id}" );
 202                 }
 203                 return $this->mCounter;
 204         }
 205
 206         # Would the given text make this article a "good" article (i.e.,
 207         # suitable for including in the article count)?
 208
 209         function isCountable( $text )
 210         {
 211                 global $wgUseCommaCount, $wgMwRedir;
 212
 213                 if ( 0 != $this->mTitle->getNamespace() ) { return 0; }
 214                 if ( $wgMwRedir->matchStart( $text ) ) { return 0; }
 215                 $token = ($wgUseCommaCount ? "," : "[[" );
 216                 if ( false === strstr( $text, $token ) ) { return 0; }
 217                 return 1;
 218         }
 219
 220         # Load the field related to the last edit time of the article.
 221         # This isn't necessary for all uses, so it's only done if needed.
 222
 223         /* private */ function loadLastEdit()
 224         {
 225                 global $wgOut;
 226                 if ( -1 != $this->mUser ) return;
 227
 228                 $sql = "SELECT cur_user,cur_user_text,cur_timestamp," .
 229                   "cur_comment,cur_minor_edit FROM cur WHERE " .
 230                   "cur_id=" . $this->getID();
 231                 $res = wfQuery( $sql, DB_READ, "Article::loadLastEdit" );
 232
 233                 if ( wfNumRows( $res ) > 0 ) {
 234                         $s = wfFetchObject( $res );
 235                         $this->mUser = $s->cur_user;
 236                         $this->mUserText = $s->cur_user_text;
 237                         $this->mTimestamp = $s->cur_timestamp;
 238                         $this->mComment = $s->cur_comment;
 239                         $this->mMinorEdit = $s->cur_minor_edit;
 240                 }
 241         }
 242
 243         function getTimestamp()
 244         {
 245                 $this->loadLastEdit();
 246                 return $this->mTimestamp;
 247         }
 248
 249         function getUser()
 250         {
 251                 $this->loadLastEdit();
 252                 return $this->mUser;
 253         }
 254
 255         function getUserText()
 256         {
 257                 $this->loadLastEdit();
 258                 return $this->mUserText;
 259         }
 260
 261         function getComment()
 262         {
 263                 $this->loadLastEdit();
 264                 return $this->mComment;
 265         }
 266
 267         function getMinorEdit()
 268         {
 269                 $this->loadLastEdit();
 270                 return $this->mMinorEdit;
 271         }
 272
 273         # This is the default action of the script: just view the page of
 274         # the given title.
 275
 276         function view()
 277         {
 278                 global $wgUser, $wgOut, $wgLang;
 279                 global $oldid, $diff; # From query
 280                 global $wgLinkCache, $IP;
 281                 $fname = "Article::view";
 282                 wfProfileIn( $fname );
 283
 284                 $wgOut->setArticleFlag( true );
 285                 $wgOut->setRobotpolicy( "index,follow" );
 286
 287                 # If we got diff and oldid in the query, we want to see a
 288                 # diff page instead of the article.
 289
 290                 if ( isset( $diff ) ) {
 291                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 292                         $de = new DifferenceEngine( $oldid, $diff );
 293                         $de->showDiffPage();
 294                         wfProfileOut( $fname );
 295                         return;
 296                 }
 297
 298                 if ( !isset( $oldid ) and $this->checkTouched() ) {
 299                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 300                                 return;
 301                         } else if ( $this->tryFileCache() ) {
 302                                 # tell wgOut that output is taken care of
 303                                 $wgOut->disable();
 304                                 return;
 305                         }
 306                 }
 307
 308                 $text = $this->getContent(); # May change mTitle
 309                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 310                 $wgOut->setHTMLTitle( $this->mTitle->getPrefixedText() .
 311                   " - " . wfMsg( "wikititlesuffix" ) );
 312
 313                 # We're looking at an old revision
 314
 315                 if ( $oldid ) {
 316                         $this->setOldSubtitle();
 317                         $wgOut->setRobotpolicy( "noindex,follow" );
 318                 }
 319                 if ( "" != $this->mRedirectedFrom ) {
 320                         $sk = $wgUser->getSkin();
 321                         $redir = $sk->makeKnownLink( $this->mRedirectedFrom, "",
 322                           "redirect=no" );
 323                         $s = wfMsg( "redirectedfrom", $redir );
 324                         $wgOut->setSubtitle( $s );
 325                 }
 326
 327                 $wgLinkCache->preFill( $this->mTitle );
 328                 $wgOut->addWikiText( $text );
 329
 330                 $this->viewUpdates();
 331                 wfProfileOut( $fname );
 332         }
 333
 334         # Theoretically we could defer these whole insert and update
 335         # functions for after display, but that's taking a big leap
 336         # of faith, and we want to be able to report database
 337         # errors at some point.
 338
 339         /* private */ function insertNewArticle( $text, $summary, $isminor, $watchthis )
 340         {
 341                 global $wgOut, $wgUser, $wgLinkCache, $wgMwRedir;
 342                 global $wgEnablePersistentLC;
 343
 344                 $fname = "Article::insertNewArticle";
 345
 346                 $this->mCountAdjustment = $this->isCountable( $text );
 347
 348                 $ns = $this->mTitle->getNamespace();
 349                 $ttl = $this->mTitle->getDBkey();
 350                 $text = $this->preSaveTransform( $text );
 351                 if ( $wgMwRedir->matchStart( $text ) ) { $redir = 1; }
 352                 else { $redir = 0; }
 353
 354                 $now = wfTimestampNow();
 355                 $won = wfInvertTimestamp( $now );
 356                 wfSeedRandom();
 357                 $rand = number_format( mt_rand() / mt_getrandmax(), 12, ".", "" );
 358                 $sql = "INSERT INTO cur (cur_namespace,cur_title,cur_text," .
 359                   "cur_comment,cur_user,cur_timestamp,cur_minor_edit,cur_counter," .
 360                   "cur_restrictions,cur_user_text,cur_is_redirect," .
 361                   "cur_is_new,cur_random,cur_touched,inverse_timestamp) VALUES ({$ns},'" . wfStrencode( $ttl ) . "', '" .
 362                   wfStrencode( $text ) . "', '" .
 363                   wfStrencode( $summary ) . "', '" .
 364                   $wgUser->getID() . "', '{$now}', " .
 365                   ( $isminor ? 1 : 0 ) . ", 0, '', '" .
 366                   wfStrencode( $wgUser->getName() ) . "', $redir, 1, $rand, '{$now}', '{$won}')";
 367                 $res = wfQuery( $sql, DB_WRITE, $fname );
 368
 369                 $newid = wfInsertId();
 370                 $this->mTitle->resetArticleID( $newid );
 371
 372                 if ( $wgEnablePersistentLC ) {
 373                         // Purge related entries in links cache on new page, to heal broken links
 374                         $ptitle = wfStrencode( $ttl );
 375                         wfQuery("DELETE linkscc FROM linkscc,brokenlinks ".
 376                                 "WHERE lcc_pageid=bl_from AND bl_to='{$ptitle}'", DB_WRITE);
 377                 }
 378
 379                 $sql = "INSERT INTO recentchanges (rc_timestamp,rc_cur_time," .
 380                   "rc_namespace,rc_title,rc_new,rc_minor,rc_cur_id,rc_user," .
 381                   "rc_user_text,rc_comment,rc_this_oldid,rc_last_oldid,rc_bot) VALUES (" .
 382                   "'{$now}','{$now}',{$ns},'" . wfStrencode( $ttl ) . "',1," .
 383                   ( $isminor ? 1 : 0 ) . ",{$newid}," . $wgUser->getID() . ",'" .
 384                   wfStrencode( $wgUser->getName() ) . "','" .
 385                   wfStrencode( $summary ) . "',0,0," .
 386                   ( $wgUser->isBot() ? 1 : 0 ) . ")";
 387                 wfQuery( $sql, DB_WRITE, $fname );
 388                 if ($watchthis) {
 389                         if(!$this->mTitle->userIsWatching()) $this->watch();
 390                 } else {
 391                         if ( $this->mTitle->userIsWatching() ) {
 392                                 $this->unwatch();
 393                         }
 394                 }
 395
 396                 # The talk page isn't in the regular link tables, so we need to update manually:
 397                 $talkns = $ns ^ 1; # talk -> normal; normal -> talk
 398                 $sql = "UPDATE cur set cur_touched='$now' WHERE cur_namespace=$talkns AND cur_title='" . wfStrencode( $ttl ) . "'";
 399                 wfQuery( $sql, DB_WRITE );
 400
 401                 $this->showArticle( $text, wfMsg( "newarticle" ) );
 402         }
 403
 404         function updateArticle( $text, $summary, $minor, $watchthis, $section = "")
 405         {
 406                 global $wgOut, $wgUser, $wgLinkCache;
 407                 global $wgDBtransactions, $wgMwRedir;
 408                 $fname = "Article::updateArticle";
 409
 410                 $this->loadLastEdit();
 411
 412                 // insert updated section into old text if we have only edited part
 413                 // of the article
 414                 if ($section != "") {
 415                         $oldtext=$this->getContent();
 416                         if($section=="new") {
 417                                 if($summary) $subject="== {$summary} ==\n\n";
 418                                 $text=$oldtext."\n\n".$subject.$text;
 419                         } else {
 420                                 $secs=preg_split("/(^=+.*?=+|^<h[1-6].*?>.*?<\/h[1-6].*?>)/mi",
 421                                   $oldtext,-1,PREG_SPLIT_DELIM_CAPTURE);
 422                                 $secs[$section*2]=$text."\n\n"; // replace with edited
 423                                 if($section) { $secs[$section*2-1]=""; } // erase old headline
 424                                 $text=join("",$secs);
 425                         }
 426                 }
 427                 if ( $this->mMinorEdit ) { $me1 = 1; } else { $me1 = 0; }
 428                 if ( $minor ) { $me2 = 1; } else { $me2 = 0; }
 429                 if ( preg_match( "/^((" . $wgMwRedir->getBaseRegex() . ")[^\\n]+)/i", $text, $m ) ) {
 430                         $redir = 1;
 431                         $text = $m[1] . "\n"; # Remove all content but redirect
 432                 }
 433                 else { $redir = 0; }
 434
 435                 $text = $this->preSaveTransform( $text );
 436
 437                 # Update article, but only if changed.
 438
 439                 if( $wgDBtransactions ) {
 440                         $sql = "BEGIN";
 441                         wfQuery( $sql, DB_WRITE );
 442                 }
 443                 $oldtext = $this->getContent( true );
 444
 445                 if ( 0 != strcmp( $text, $oldtext ) ) {
 446                         $this->mCountAdjustment = $this->isCountable( $text )
 447                           - $this->isCountable( $oldtext );
 448
 449                         $now = wfTimestampNow();
 450                         $won = wfInvertTimestamp( $now );
 451                         $sql = "UPDATE cur SET cur_text='" . wfStrencode( $text ) .
 452                           "',cur_comment='" .  wfStrencode( $summary ) .
 453                           "',cur_minor_edit={$me2}, cur_user=" . $wgUser->getID() .
 454                           ",cur_timestamp='{$now}',cur_user_text='" .
 455                           wfStrencode( $wgUser->getName() ) .
 456                           "',cur_is_redirect={$redir}, cur_is_new=0, cur_touched='{$now}', inverse_timestamp='{$won}' " .
 457                           "WHERE cur_id=" . $this->getID() .
 458                           " AND cur_timestamp='" . $this->getTimestamp() . "'";
 459                         $res = wfQuery( $sql, DB_WRITE, $fname );
 460
 461                         if( wfAffectedRows() == 0 ) {
 462                                 /* Belated edit conflict! Run away!! */
 463                                 return false;
 464                         }
 465
 466                         $sql = "INSERT INTO old (old_namespace,old_title,old_text," .
 467                           "old_comment,old_user,old_user_text,old_timestamp," .
 468                           "old_minor_edit,inverse_timestamp) VALUES (" .
 469                           $this->mTitle->getNamespace() . ", '" .
 470                           wfStrencode( $this->mTitle->getDBkey() ) . "', '" .
 471                           wfStrencode( $oldtext ) . "', '" .
 472                           wfStrencode( $this->getComment() ) . "', " .
 473                           $this->getUser() . ", '" .
 474                           wfStrencode( $this->getUserText() ) . "', '" .
 475                           $this->getTimestamp() . "', " . $me1 . ", '" .
 476                           wfInvertTimestamp( $this->getTimestamp() ) . "')";
 477                         $res = wfQuery( $sql, DB_WRITE, $fname );
 478                         $oldid = wfInsertID( $res );
 479
 480                         $sql = "INSERT INTO recentchanges (rc_timestamp,rc_cur_time," .
 481                           "rc_namespace,rc_title,rc_new,rc_minor,rc_bot,rc_cur_id,rc_user," .
 482                           "rc_user_text,rc_comment,rc_this_oldid,rc_last_oldid) VALUES (" .
 483                           "'{$now}','{$now}'," . $this->mTitle->getNamespace() . ",'" .
 484                           wfStrencode( $this->mTitle->getDBkey() ) . "',0,{$me2}," .
 485                           ( $wgUser->isBot() ? 1 : 0 ) . "," .
 486                           $this->getID() . "," . $wgUser->getID() . ",'" .
 487                           wfStrencode( $wgUser->getName() ) . "','" .
 488                           wfStrencode( $summary ) . "',0,{$oldid})";
 489                         wfQuery( $sql, DB_WRITE, $fname );
 490
 491                         $sql = "UPDATE recentchanges SET rc_this_oldid={$oldid} " .
 492                           "WHERE rc_namespace=" . $this->mTitle->getNamespace() . " AND " .
 493                           "rc_title='" . wfStrencode( $this->mTitle->getDBkey() ) . "' AND " .
 494                           "rc_timestamp='" . $this->getTimestamp() . "'";
 495                         wfQuery( $sql, DB_WRITE, $fname );
 496
 497                         $sql = "UPDATE recentchanges SET rc_cur_time='{$now}' " .
 498                           "WHERE rc_cur_id=" . $this->getID();
 499                         wfQuery( $sql, DB_WRITE, $fname );
 500
 501                         global $wgEnablePersistentLC;
 502                         if ( $wgEnablePersistentLC ) {
 503                                 // Purge link cache for this page
 504                                 $pageid=$this->getID();
 505                                 wfQuery("DELETE FROM linkscc WHERE lcc_pageid='{$pageid}'", DB_WRITE);
 506                         }
 507                 }
 508
 509                 if( $wgDBtransactions ) {
 510                         $sql = "COMMIT";
 511                         wfQuery( $sql, DB_WRITE );
 512                 }
 513
 514                 if ($watchthis) {
 515                         if (!$this->mTitle->userIsWatching()) $this->watch();
 516                 } else {
 517                         if ( $this->mTitle->userIsWatching() ) {
 518                                 $this->unwatch();
 519                         }
 520                 }
 521
 522                 $this->showArticle( $text, wfMsg( "updated" ) );
 523                 return true;
 524         }
 525
 526         # After we've either updated or inserted the article, update
 527         # the link tables and redirect to the new page.
 528
 529         function showArticle( $text, $subtitle )
 530         {
 531                 global $wgOut, $wgUser, $wgLinkCache, $wgUseBetterLinksUpdate;
 532                 global $wgMwRedir;
 533
 534                 $wgLinkCache = new LinkCache();
 535
 536                 # Get old version of link table to allow incremental link updates
 537                 if ( $wgUseBetterLinksUpdate ) {
 538                         $wgLinkCache->preFill( $this->mTitle );
 539                         $wgLinkCache->clear();
 540                 }
 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         # This shares a lot of issues (and code) with Recent Changes
 598
 599         function history()
 600         {
 601                 global $wgUser, $wgOut, $wgLang, $offset, $limit;
 602
 603                 # If page hasn't changed, client can cache this
 604
 605                 if( $wgOut->checkLastModified( $this->getTimestamp() ) ){
 606                         # Client cache fresh and headers sent, nothing more to do.
 607                         return;
 608                 }
 609                 $fname = "Article::history";
 610                 wfProfileIn( $fname );
 611
 612                 $wgOut->setPageTitle( $this->mTitle->getPRefixedText() );
 613                 $wgOut->setSubtitle( wfMsg( "revhistory" ) );
 614                 $wgOut->setArticleFlag( false );
 615                 $wgOut->setRobotpolicy( "noindex,nofollow" );
 616
 617                 if( $this->mTitle->getArticleID() == 0 ) {
 618                         $wgOut->addHTML( wfMsg( "nohistory" ) );
 619                         wfProfileOut( $fname );
 620                         return;
 621                 }
 622
 623                 $offset = (int)$offset;
 624                 $limit = (int)$limit;
 625                 if( $limit == 0 ) $limit = 50;
 626                 $namespace = $this->mTitle->getNamespace();
 627                 $title = $this->mTitle->getText();
 628                 $sql = "SELECT old_id,old_user," .
 629                   "old_comment,old_user_text,old_timestamp,old_minor_edit ".
 630                   "FROM old USE INDEX (name_title_timestamp) " .
 631                   "WHERE old_namespace={$namespace} AND " .
 632                   "old_title='" . wfStrencode( $this->mTitle->getDBkey() ) . "' " .
 633                   "ORDER BY inverse_timestamp LIMIT $offset, $limit";
 634                 $res = wfQuery( $sql, DB_READ, "Article::history" );
 635
 636                 $revs = wfNumRows( $res );
 637                 if( $this->mTitle->getArticleID() == 0 ) {
 638                         $wgOut->addHTML( wfMsg( "nohistory" ) );
 639                         wfProfileOut( $fname );
 640                         return;
 641                 }
 642
 643                 $sk = $wgUser->getSkin();
 644                 $numbar = wfViewPrevNext(
 645                         $offset, $limit,
 646                         $this->mTitle->getPrefixedText(),
 647                         "action=history" );
 648                 $s = $numbar;
 649                 $s .= $sk->beginHistoryList();
 650
 651                 if($offset == 0 )
 652                 $s .= $sk->historyLine( $this->getTimestamp(), $this->getUser(),
 653                   $this->getUserText(), $namespace,
 654                   $title, 0, $this->getComment(),
 655                   ( $this->getMinorEdit() > 0 ) );
 656
 657                 $revs = wfNumRows( $res );
 658                 while ( $line = wfFetchObject( $res ) ) {
 659                         $s .= $sk->historyLine( $line->old_timestamp, $line->old_user,
 660                           $line->old_user_text, $namespace,
 661                           $title, $line->old_id,
 662                           $line->old_comment, ( $line->old_minor_edit > 0 ) );
 663                 }
 664                 $s .= $sk->endHistoryList();
 665                 $s .= $numbar;
 666                 $wgOut->addHTML( $s );
 667                 wfProfileOut( $fname );
 668         }
 669
 670         function protect( $limit = "sysop" )
 671         {
 672                 global $wgUser, $wgOut;
 673
 674                 if ( ! $wgUser->isSysop() ) {
 675                         $wgOut->sysopRequired();
 676                         return;
 677                 }
 678                 if ( wfReadOnly() ) {
 679                         $wgOut->readOnlyPage();
 680                         return;
 681                 }
 682                 $id = $this->mTitle->getArticleID();
 683                 if ( 0 == $id ) {
 684                         $wgOut->fatalEror( wfMsg( "badarticleerror" ) );
 685                         return;
 686                 }
 687         $sql = "UPDATE cur SET cur_touched='" . wfTimestampNow() . "'," .
 688                         "cur_restrictions='{$limit}' WHERE cur_id={$id}";
 689                 wfQuery( $sql, DB_WRITE, "Article::protect" );
 690
 691                 $log = new LogPage( wfMsg( "protectlogpage" ), wfMsg( "protectlogtext" ) );
 692                 if ( $limit === "" ) {
 693                         $log->addEntry( wfMsg( "unprotectedarticle", $this->mTitle->getPrefixedText() ), "" );
 694                 } else {
 695                         $log->addEntry( wfMsg( "protectedarticle", $this->mTitle->getPrefixedText() ), "" );
 696                 }
 697                 $wgOut->redirect( wfLocalUrl( $this->mTitle->getPrefixedURL() ) );
 698         }
 699
 700         function unprotect()
 701         {
 702                 return $this->protect( "" );
 703         }
 704
 705         function delete()
 706         {
 707                 global $wgUser, $wgOut;
 708                 global $wpConfirm, $wpReason, $image, $oldimage;
 709
 710                 # This code desperately needs to be totally rewritten
 711
 712                 if ( ( ! $wgUser->isSysop() ) ) {
 713                         $wgOut->sysopRequired();
 714                         return;
 715                 }
 716                 if ( wfReadOnly() ) {
 717                         $wgOut->readOnlyPage();
 718                         return;
 719                 }
 720
 721                 # Better double-check that it hasn't been deleted yet!
 722                 $wgOut->setPagetitle( wfMsg( "confirmdelete" ) );
 723                 if ( ( "" == trim( $this->mTitle->getText() ) )
 724                   or ( $this->mTitle->getArticleId() == 0 ) ) {
 725                         $wgOut->fatalError( wfMsg( "cannotdelete" ) );
 726                         return;
 727                 }
 728
 729                 if ( $_POST["wpConfirm"] ) {
 730                         $this->doDelete();
 731                         return;
 732                 }
 733
 734                 # determine whether this page has earlier revisions
 735                 # and insert a warning if it does
 736                 # we select the text because it might be useful below
 737                 $ns = $this->mTitle->getNamespace();
 738                 $title = $this->mTitle->getDBkey();
 739                 $etitle = wfStrencode( $title );
 740                 $sql = "SELECT old_text FROM old WHERE old_namespace=$ns and old_title='$etitle' ORDER BY inverse_timestamp LIMIT 1";
 741                 $res = wfQuery( $sql, DB_READ, $fname );
 742                 if( ($old=wfFetchObject($res)) && !$wpConfirm ) {
 743                         $skin=$wgUser->getSkin();
 744                         $wgOut->addHTML("<B>".wfMsg("historywarning"));
 745                         $wgOut->addHTML( $skin->historyLink() ."</B><P>");
 746                 }
 747
 748                 $sql="SELECT cur_text FROM cur WHERE cur_namespace=$ns and cur_title='$etitle'";
 749                 $res=wfQuery($sql, DB_READ, $fname);
 750                 if( ($s=wfFetchObject($res))) {
 751
 752                         # if this is a mini-text, we can paste part of it into the deletion reason
 753
 754                         #if this is empty, an earlier revision may contain "useful" text
 755                         if($s->cur_text!="") {
 756                                 $text=$s->cur_text;
 757                         } else {
 758                                 if($old) {
 759                                         $text=$old->old_text;
 760                                         $blanked=1;
 761                                 }
 762
 763                         }
 764
 765                         $length=strlen($text);
 766
 767                         # this should not happen, since it is not possible to store an empty, new
 768                         # page. Let's insert a standard text in case it does, though
 769                         if($length==0 && !$wpReason) { $wpReason=wfmsg("exblank");}
 770
 771
 772                         if($length < 500 && !$wpReason) {
 773
 774                                 # comment field=255, let's grep the first 150 to have some user
 775                                 # space left
 776                                 $text=substr($text,0,150);
 777                                 # let's strip out newlines and HTML tags
 778                                 $text=preg_replace("/\"/","'",$text);
 779                                 $text=preg_replace("/\</","&lt;",$text);
 780                                 $text=preg_replace("/\>/","&gt;",$text);
 781                                 $text=preg_replace("/[\n\r]/","",$text);
 782                                 if(!$blanked) {
 783                                         $wpReason=wfMsg("excontent"). " '".$text;
 784                                 } else {
 785                                         $wpReason=wfMsg("exbeforeblank") . " '".$text;
 786                                 }
 787                                 if($length>150) { $wpReason .= "..."; } # we've only pasted part of the text
 788                                 $wpReason.="'";
 789                         }
 790                 }
 791
 792                 return $this->confirmDelete();
 793         }
 794
 795         function confirmDelete( $par = "" )
 796         {
 797                 global $wgOut;
 798                 global $wpReason;
 799
 800                 wfDebug( "Article::confirmDelete\n" );
 801
 802                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
 803                 $wgOut->setSubtitle( wfMsg( "deletesub", $sub ) );
 804                 $wgOut->setRobotpolicy( "noindex,nofollow" );
 805                 $wgOut->addWikiText( wfMsg( "confirmdeletetext" ) );
 806
 807                 $t = $this->mTitle->getPrefixedURL();
 808
 809                 $formaction = wfEscapeHTML( wfLocalUrl( $t, "action=delete" . $par ) );
 810                 $confirm = wfMsg( "confirm" );
 811                 $check = wfMsg( "confirmcheck" );
 812                 $delcom = wfMsg( "deletecomment" );
 813
 814                 $wgOut->addHTML( "
 815 <form id=\"deleteconfirm\" method=\"post\" action=\"{$formaction}\">
 816 <table border=0><tr><td align=right>
 817 {$delcom}:</td><td align=left>
 818 <input type=text size=60 name=\"wpReason\" value=\"" . htmlspecialchars( $wpReason ) . "\">
 819 </td></tr><tr><td>&nbsp;</td></tr>
 820 <tr><td align=right>
 821 <input type=checkbox name=\"wpConfirm\" value='1' id=\"wpConfirm\">
 822 </td><td><label for=\"wpConfirm\">{$check}</label></td>
 823 </tr><tr><td>&nbsp;</td><td>
 824 <input type=submit name=\"wpConfirmB\" value=\"{$confirm}\">
 825 </td></tr></table></form>\n" );
 826
 827                 $wgOut->returnToMain( false );
 828         }
 829
 830         function doDelete()
 831         {
 832                 global $wgOut, $wgUser, $wgLang;
 833                 global $wpReason;
 834                 $fname = "Article::doDelete";
 835                 wfDebug( "$fname\n" );
 836
 837                 $this->doDeleteArticle( $this->mTitle );
 838                 $deleted = $this->mTitle->getPrefixedText();
 839
 840                 $wgOut->setPagetitle( wfMsg( "actioncomplete" ) );
 841                 $wgOut->setRobotpolicy( "noindex,nofollow" );
 842
 843                 $sk = $wgUser->getSkin();
 844                 $loglink = $sk->makeKnownLink( $wgLang->getNsText(
 845                   Namespace::getWikipedia() ) .
 846                   ":" . wfMsg( "dellogpage" ), wfMsg( "deletionlog" ) );
 847
 848                 $text = wfMsg( "deletedtext", $deleted, $loglink );
 849
 850                 $wgOut->addHTML( "<p>" . $text );
 851                 $wgOut->returnToMain( false );
 852         }
 853
 854         function doDeleteArticle( $title )
 855         {
 856                 global $wgUser, $wgOut, $wgLang, $wpReason, $wgDeferredUpdateList,
 857                         $wgEnablePersistentLC;
 858
 859                 $fname = "Article::doDeleteArticle";
 860                 wfDebug( "$fname\n" );
 861
 862                 $ns = $title->getNamespace();
 863                 $t = wfStrencode( $title->getDBkey() );
 864                 $id = $title->getArticleID();
 865
 866                 if ( "" == $t ) {
 867                         $wgOut->fatalError( wfMsg( "cannotdelete" ) );
 868                         return;
 869                 }
 870
 871                 $u = new SiteStatsUpdate( 0, 1, -$this->isCountable( $this->getContent( true ) ) );
 872                 array_push( $wgDeferredUpdateList, $u );
 873
 874                 # Move article and history to the "archive" table
 875                 $sql = "INSERT INTO archive (ar_namespace,ar_title,ar_text," .
 876                   "ar_comment,ar_user,ar_user_text,ar_timestamp,ar_minor_edit," .
 877                   "ar_flags) SELECT cur_namespace,cur_title,cur_text,cur_comment," .
 878                   "cur_user,cur_user_text,cur_timestamp,cur_minor_edit,0 FROM cur " .
 879                   "WHERE cur_namespace={$ns} AND cur_title='{$t}'";
 880                 wfQuery( $sql, DB_WRITE, $fname );
 881
 882                 $sql = "INSERT INTO archive (ar_namespace,ar_title,ar_text," .
 883                   "ar_comment,ar_user,ar_user_text,ar_timestamp,ar_minor_edit," .
 884                   "ar_flags) SELECT old_namespace,old_title,old_text,old_comment," .
 885                   "old_user,old_user_text,old_timestamp,old_minor_edit,old_flags " .
 886                   "FROM old WHERE old_namespace={$ns} AND old_title='{$t}'";
 887                 wfQuery( $sql, DB_WRITE, $fname );
 888
 889                 # Now that it's safely backed up, delete it
 890
 891                 $sql = "DELETE FROM cur WHERE cur_namespace={$ns} AND " .
 892                   "cur_title='{$t}'";
 893                 wfQuery( $sql, DB_WRITE, $fname );
 894
 895                 $sql = "DELETE FROM old WHERE old_namespace={$ns} AND " .
 896                   "old_title='{$t}'";
 897                 wfQuery( $sql, DB_WRITE, $fname );
 898
 899                 $sql = "DELETE FROM recentchanges WHERE rc_namespace={$ns} AND " .
 900                   "rc_title='{$t}'";
 901                 wfQuery( $sql, DB_WRITE, $fname );
 902
 903                 # Finally, clean up the link tables
 904
 905                 if ( 0 != $id ) {
 906
 907                         $t = wfStrencode( $title->getPrefixedDBkey() );
 908
 909                         if ( $wgEnablePersistentLC ) {
 910                                 // Purge related entries in links cache on delete,
 911                                 wfQuery("DELETE linkscc FROM linkscc,links ".
 912                                         "WHERE lcc_title=links.l_from AND l_to={$id}", DB_WRITE);
 913                                 wfQuery("DELETE FROM linkscc WHERE lcc_title='{$t}'", DB_WRITE);
 914                         }
 915
 916                         $sql = "SELECT l_from FROM links WHERE l_to={$id}";
 917                         $res = wfQuery( $sql, DB_READ, $fname );
 918
 919                         $sql = "INSERT INTO brokenlinks (bl_from,bl_to) VALUES ";
 920                         $now = wfTimestampNow();
 921                         $sql2 = "UPDATE cur SET cur_touched='{$now}' WHERE cur_id IN (";
 922                         $first = true;
 923
 924                         while ( $s = wfFetchObject( $res ) ) {
 925                                 $nt = Title::newFromDBkey( $s->l_from );
 926                                 $lid = $nt->getArticleID();
 927
 928                                 if ( ! $first ) { $sql .= ","; $sql2 .= ","; }
 929                                 $first = false;
 930                                 $sql .= "({$lid},'{$t}')";
 931                                 $sql2 .= "{$lid}";
 932                         }
 933                         $sql2 .= ")";
 934                         if ( ! $first ) {
 935                                 wfQuery( $sql, DB_WRITE, $fname );
 936                                 wfQuery( $sql2, DB_WRITE, $fname );
 937                         }
 938                         wfFreeResult( $res );
 939
 940                         $sql = "DELETE FROM links WHERE l_to={$id}";
 941                         wfQuery( $sql, DB_WRITE, $fname );
 942
 943                         $sql = "DELETE FROM links WHERE l_from='{$t}'";
 944                         wfQuery( $sql, DB_WRITE, $fname );
 945
 946                         $sql = "DELETE FROM imagelinks WHERE il_from='{$t}'";
 947                         wfQuery( $sql, DB_WRITE, $fname );
 948
 949                         $sql = "DELETE FROM brokenlinks WHERE bl_from={$id}";
 950                         wfQuery( $sql, DB_WRITE, $fname );
 951                 }
 952
 953                 $log = new LogPage( wfMsg( "dellogpage" ), wfMsg( "dellogpagetext" ) );
 954                 $art = $title->getPrefixedText();
 955                 $wpReason = wfCleanQueryVar( $wpReason );
 956                 $log->addEntry( wfMsg( "deletedarticle", $art ), $wpReason );
 957
 958                 # Clear the cached article id so the interface doesn't act like we exist
 959                 $this->mTitle->resetArticleID( 0 );
 960                 $this->mTitle->mArticleID = 0;
 961         }
 962
 963         function rollback()
 964         {
 965                 global $wgUser, $wgLang, $wgOut, $from;
 966
 967                 if ( ! $wgUser->isSysop() ) {
 968                         $wgOut->sysopRequired();
 969                         return;
 970                 }
 971                 if ( wfReadOnly() ) {
 972                         $wgOut->readOnlyPage( $this->getContent() );
 973                         return;
 974                 }
 975
 976                 # Replace all this user's current edits with the next one down
 977                 $tt = wfStrencode( $this->mTitle->getDBKey() );
 978                 $n = $this->mTitle->getNamespace();
 979
 980                 # Get the last editor
 981                 $sql = "SELECT cur_id,cur_user,cur_user_text,cur_comment FROM cur WHERE cur_title='{$tt}' AND cur_namespace={$n}";
 982                 $res = wfQuery( $sql, DB_READ );
 983                 if( ($x = wfNumRows( $res )) != 1 ) {
 984                         # Something wrong
 985                         $wgOut->addHTML( wfMsg( "notanarticle" ) );
 986                         return;
 987                 }
 988                 $s = wfFetchObject( $res );
 989                 $ut = wfStrencode( $s->cur_user_text );
 990                 $uid = $s->cur_user;
 991                 $pid = $s->cur_id;
 992
 993                 $from = str_replace( '_', ' ', wfCleanQueryVar( $from ) );
 994                 if( $from != $s->cur_user_text ) {
 995                         $wgOut->setPageTitle(wfmsg("rollbackfailed"));
 996                         $wgOut->addWikiText( wfMsg( "alreadyrolled",
 997                                 htmlspecialchars( $this->mTitle->getPrefixedText()),
 998                                 htmlspecialchars( $from ),
 999                                 htmlspecialchars( $s->cur_user_text ) ) );
1000                         if($s->cur_comment != "") {
1001                                 $wgOut->addHTML(
1002                                         wfMsg("editcomment",
1003                                         htmlspecialchars( $s->cur_comment ) ) );
1004                                 }
1005                         return;
1006                 }
1007
1008                 # Get the last edit not by this guy
1009                 $sql = "SELECT old_text,old_user,old_user_text
1010                 FROM old USE INDEX (name_title_timestamp)
1011                 WHERE old_namespace={$n} AND old_title='{$tt}'
1012                 AND (old_user <> {$uid} OR old_user_text <> '{$ut}')
1013                 ORDER BY inverse_timestamp LIMIT 1";
1014                 $res = wfQuery( $sql, DB_READ );
1015                 if( wfNumRows( $res ) != 1 ) {
1016                         # Something wrong
1017                         $wgOut->setPageTitle(wfMsg("rollbackfailed"));
1018                         $wgOut->addHTML( wfMsg( "cantrollback" ) );
1019                         return;
1020                 }
1021                 $s = wfFetchObject( $res );
1022
1023                 # Save it!
1024                 $newcomment = wfMsg( "revertpage", $s->old_user_text );
1025                 $wgOut->setPagetitle( wfMsg( "actioncomplete" ) );
1026                 $wgOut->setRobotpolicy( "noindex,nofollow" );
1027                 $wgOut->addHTML( "<h2>" . $newcomment . "</h2>\n<hr>\n" );
1028                 $this->updateArticle( $s->old_text, $newcomment, 1, $this->mTitle->userIsWatching() );
1029
1030                 global $wgEnablePersistentLC;
1031                 if ( $wgEnablePersistentLC ) {
1032                         wfQuery("DELETE FROM linkscc WHERE lcc_pageid='{$pid}'", DB_WRITE);
1033                 }
1034
1035                 $wgOut->returnToMain( false );
1036         }
1037
1038
1039         # Do standard deferred updates after page view
1040
1041         /* private */ function viewUpdates()
1042         {
1043                 global $wgDeferredUpdateList;
1044
1045                 if ( 0 != $this->getID() ) {
1046                         global $wgDisableCounters;
1047                         if( !$wgDisableCounters ) {
1048                                 $u = new ViewCountUpdate( $this->getID() );
1049                                 array_push( $wgDeferredUpdateList, $u );
1050                                 $u = new SiteStatsUpdate( 1, 0, 0 );
1051                                 array_push( $wgDeferredUpdateList, $u );
1052                         }
1053                         $u = new UserTalkUpdate( 0, $this->mTitle->getNamespace(),
1054                           $this->mTitle->getDBkey() );
1055                         array_push( $wgDeferredUpdateList, $u );
1056                 }
1057         }
1058
1059         # Do standard deferred updates after page edit.
1060         # Every 1000th edit, prune the recent changes table.
1061
1062         /* private */ function editUpdates( $text )
1063         {
1064                 global $wgDeferredUpdateList, $wgDBname, $wgMemc;
1065
1066                 wfSeedRandom();
1067                 if ( 0 == mt_rand( 0, 999 ) ) {
1068                         $cutoff = wfUnix2Timestamp( time() - ( 7 * 86400 ) );
1069                         $sql = "DELETE FROM recentchanges WHERE rc_timestamp < '{$cutoff}'";
1070                         wfQuery( $sql, DB_WRITE );
1071                 }
1072                 $id = $this->getID();
1073                 $title = $this->mTitle->getPrefixedDBkey();
1074                 $adj = $this->mCountAdjustment;
1075
1076                 if ( 0 != $id ) {
1077                         $u = new LinksUpdate( $id, $title );
1078                         array_push( $wgDeferredUpdateList, $u );
1079                         $u = new SiteStatsUpdate( 0, 1, $adj );
1080                         array_push( $wgDeferredUpdateList, $u );
1081                         $u = new SearchUpdate( $id, $title, $text );
1082                         array_push( $wgDeferredUpdateList, $u );
1083
1084                         $u = new UserTalkUpdate( 1, $this->mTitle->getNamespace(),
1085                           $this->mTitle->getDBkey() );
1086                         array_push( $wgDeferredUpdateList, $u );
1087
1088                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1089                                 $messageCache = $wgMemc->get( "$wgDBname:messages" );
1090
1091                                 # If another thread is loading, poll
1092                                 for ( $i=0; $i<70 && $messageCache == 'loading'; $i++ ) {
1093                                         sleep(1);
1094                                         $messageCache = $wgMemc->get( "$wgDBname:messages" );
1095                                 }
1096
1097                                 if ( !$messageCache || $messageCache == 'loading' ) {
1098                                         $messageCache = wfLoadAllMessages();
1099                                 }
1100                                 $messageCache[$this->mTitle->getDBkey()] = $text;
1101                                 $wgMemc->set( "$wgDBname:messages", $messageCache, 86400 );
1102                         }
1103                 }
1104         }
1105
1106         /* private */ function setOldSubtitle()
1107         {
1108                 global $wgLang, $wgOut;
1109
1110                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
1111                 $r = wfMsg( "revisionasof", $td );
1112                 $wgOut->setSubtitle( "({$r})" );
1113         }
1114
1115         # This function is called right before saving the wikitext,
1116         # so we can do things like signatures and links-in-context.
1117
1118         function preSaveTransform( $text )
1119         {
1120                 $s = "";
1121                 while ( "" != $text ) {
1122                         $p = preg_split( "/<\\s*nowiki\\s*>/i", $text, 2 );
1123                         $s .= $this->pstPass2( $p[0] );
1124
1125                         if ( ( count( $p ) < 2 ) || ( "" == $p[1] ) ) { $text = ""; }
1126                         else {
1127                                 $q = preg_split( "/<\\/\\s*nowiki\\s*>/i", $p[1], 2 );
1128                                 $s .= "<nowiki>{$q[0]}</nowiki>";
1129                                 $text = $q[1];
1130                         }
1131                 }
1132                 return rtrim( $s );
1133         }
1134
1135         /* private */ function pstPass2( $text )
1136         {
1137                 global $wgUser, $wgLang, $wgLocaltimezone;
1138
1139                 # Signatures
1140                 #
1141                 $n = $wgUser->getName();
1142                 $k = $wgUser->getOption( "nickname" );
1143                 if ( "" == $k ) { $k = $n; }
1144                 if(isset($wgLocaltimezone)) {
1145                         $oldtz = getenv("TZ"); putenv("TZ=$wgLocaltimezone");
1146                 }
1147                 /* Note: this is an ugly timezone hack for the European wikis */
1148                 $d = $wgLang->timeanddate( date( "YmdHis" ), false ) .
1149                   " (" . date( "T" ) . ")";
1150                 if(isset($wgLocaltimezone)) putenv("TZ=$oldtz");
1151
1152                 $text = preg_replace( "/~~~~/", "[[" . $wgLang->getNsText(
1153                   Namespace::getUser() ) . ":$n|$k]] $d", $text );
1154                 $text = preg_replace( "/~~~/", "[[" . $wgLang->getNsText(
1155                   Namespace::getUser() ) . ":$n|$k]]", $text );
1156
1157                 # Context links: [[|name]] and [[name (context)|]]
1158                 #
1159                 $tc = "[&;%\\-,.\\(\\)' _0-9A-Za-z\\/:\\x80-\\xff]";
1160                 $np = "[&;%\\-,.' _0-9A-Za-z\\/:\\x80-\\xff]"; # No parens
1161                 $namespacechar = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
1162                 $conpat = "/^({$np}+) \\(({$tc}+)\\)$/";
1163
1164                 $p1 = "/\[\[({$np}+) \\(({$np}+)\\)\\|]]/";             # [[page (context)|]]
1165                 $p2 = "/\[\[\\|({$tc}+)]]/";                                    # [[|page]]
1166                 $p3 = "/\[\[($namespacechar+):({$np}+)\\|]]/";          # [[namespace:page|]]
1167                 $p4 = "/\[\[($namespacechar+):({$np}+) \\(({$np}+)\\)\\|]]/";
1168                                                                                                                 # [[ns:page (cont)|]]
1169                 $context = "";
1170                 $t = $this->mTitle->getText();
1171                 if ( preg_match( $conpat, $t, $m ) ) {
1172                         $context = $m[2];
1173                 }
1174                 $text = preg_replace( $p4, "[[\\1:\\2 (\\3)|\\2]]", $text );
1175                 $text = preg_replace( $p1, "[[\\1 (\\2)|\\1]]", $text );
1176                 $text = preg_replace( $p3, "[[\\1:\\2|\\2]]", $text );
1177
1178                 if ( "" == $context ) {
1179                         $text = preg_replace( $p2, "[[\\1]]", $text );
1180                 } else {
1181                         $text = preg_replace( $p2, "[[\\1 ({$context})|\\1]]", $text );
1182                 }
1183
1184                 # {{SUBST:xxx}} variables
1185                 #
1186                 $mw =& MagicWord::get( MAG_SUBST );
1187                 $text = $mw->substituteCallback( $text, "wfReplaceSubstVar" );
1188
1189 /* Experimental:
1190                 # Trim trailing whitespace
1191                 # MAG_END (__END__) tag allows for trailing
1192                 # whitespace to be deliberately included
1193                 $text = rtrim( $text );
1194                 $mw =& MagicWord::get( MAG_END );
1195                 $mw->matchAndRemove( $text );
1196 */
1197                 return $text;
1198         }
1199
1200         /* Caching functions */
1201
1202         # checkLastModified returns true iff it has taken care of all
1203         # output to the client that is necessary for this request.
1204         # (that is, it has sent a cached version of the page)
1205         function tryFileCache() {
1206                 static $called = false;
1207                 if( $called ) {
1208                         wfDebug( " tryFileCache() -- called twice!?\n" );
1209                         return;
1210                 }
1211                 $called = true;
1212                 if($this->isFileCacheable()) {
1213                         $touched = $this->mTouched;
1214                         if( strpos( $this->mContent, "{{" ) !== false ) {
1215                                 # Expire pages with variable replacements in an hour
1216                                 $expire = wfUnix2Timestamp( time() - 3600 );
1217                                 $touched = max( $expire, $touched );
1218                         }
1219                         $cache = new CacheManager( $this->mTitle );
1220                         if($cache->isFileCacheGood( $touched )) {
1221                                 global $wgOut;
1222                                 wfDebug( " tryFileCache() - about to load\n" );
1223                                 $cache->loadFromFileCache();
1224                                 return true;
1225                         } else {
1226                                 wfDebug( " tryFileCache() - starting buffer\n" );
1227                                 if($cache->useGzip() && wfClientAcceptsGzip()) {
1228                                         /* For some reason, adding this header line over in
1229                                            CacheManager::saveToFileCache() fails on my test
1230                                            setup at home, though it works on the live install.
1231                                            Make double-sure...  --brion */
1232                                         header( "Content-Encoding: gzip" );
1233                                 }
1234                                 ob_start( array(&$cache, 'saveToFileCache' ) );
1235                         }
1236                 } else {
1237                         wfDebug( " tryFileCache() - not cacheable\n" );
1238                 }
1239         }
1240
1241         function isFileCacheable() {
1242                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader;
1243                 global $action, $oldid, $diff, $redirect, $printable;
1244                 return $wgUseFileCache
1245                         and (!$wgShowIPinHeader)
1246                         and ($this->getID() != 0)
1247                         and ($wgUser->getId() == 0)
1248                         and (!$wgUser->getNewtalk())
1249                         and ($this->mTitle->getNamespace != Namespace::getSpecial())
1250                         and ($action == "view")
1251                         and (!isset($oldid))
1252                         and (!isset($diff))
1253                         and (!isset($redirect))
1254                         and (!isset($printable))
1255                         and (!$this->mRedirectedFrom);
1256         }
1257
1258         function checkTouched() {
1259                 $id = $this->getID();
1260                 $sql = "SELECT cur_touched,cur_is_redirect FROM cur WHERE cur_id=$id";
1261                 $res = wfQuery( $sql, DB_READ, "Article::checkTouched" );
1262                 if( $s = wfFetchObject( $res ) ) {
1263                         $this->mTouched = $s->cur_touched;
1264                         return !$s->cur_is_redirect;
1265                 } else {
1266                         return false;
1267                 }
1268         }
1269 }
1270
1271 function wfReplaceSubstVar( $matches ) {
1272         return wfMsg( $matches[1] );
1273 }
1274
1275 ?>