includes/EditPage.php

   1 <?php
   2 /**
   3  * Contain the EditPage class
   4  * @package MediaWiki
   5  */
   6
   7 /**
   8  * Splitting edit page/HTML interface from Article...
   9  * The actual database and text munging is still in Article,
  10  * but it should get easier to call those from alternate
  11  * interfaces.
  12  *
  13  * @package MediaWiki
  14  */
  15
  16 class EditPage {
  17         var $mArticle;
  18         var $mTitle;
  19         var $mMetaData = '';
  20         var $isConflict = false;
  21         var $isCssJsSubpage = false;
  22         var $deletedSinceEdit = false;
  23         var $formtype;
  24         var $firsttime;
  25         var $lastDelete;
  26         var $mTokenOk = true;
  27         var $tooBig = false;
  28         var $kblength = false;
  29         var $missingComment = false;
  30         var $missingSummary = false;
  31         var $allowBlankSummary = false;
  32         var $autoSumm = '';
  33         var $hookError = '';
  34
  35         # Form values
  36         var $save = false, $preview = false, $diff = false;
  37         var $minoredit = false, $watchthis = false, $recreate = false;
  38         var $textbox1 = '', $textbox2 = '', $summary = '';
  39         var $edittime = '', $section = '', $starttime = '';
  40         var $oldid = 0, $editintro = '', $scrolltop = null;
  41
  42         /**
  43          * @todo document
  44          * @param $article
  45          */
  46         function EditPage( $article ) {
  47                 $this->mArticle =& $article;
  48                 global $wgTitle;
  49                 $this->mTitle =& $wgTitle;
  50         }
  51
  52         /**
  53          * This is the function that extracts metadata from the article body on the first view.
  54          * To turn the feature on, set $wgUseMetadataEdit = true ; in LocalSettings
  55          *  and set $wgMetadataWhitelist to the *full* title of the template whitelist
  56          */
  57         function extractMetaDataFromArticle () {
  58                 global $wgUseMetadataEdit , $wgMetadataWhitelist , $wgLang ;
  59                 $this->mMetaData = '' ;
  60                 if ( !$wgUseMetadataEdit ) return ;
  61                 if ( $wgMetadataWhitelist == '' ) return ;
  62                 $s = '' ;
  63                 $t = $this->mArticle->getContent();
  64
  65                 # MISSING : <nowiki> filtering
  66
  67                 # Categories and language links
  68                 $t = explode ( "\n" , $t ) ;
  69                 $catlow = strtolower ( $wgLang->getNsText ( NS_CATEGORY ) ) ;
  70                 $cat = $ll = array() ;
  71                 foreach ( $t AS $key => $x )
  72                 {
  73                         $y = trim ( strtolower ( $x ) ) ;
  74                         while ( substr ( $y , 0 , 2 ) == '[[' )
  75                         {
  76                                 $y = explode ( ']]' , trim ( $x ) ) ;
  77                                 $first = array_shift ( $y ) ;
  78                                 $first = explode ( ':' , $first ) ;
  79                                 $ns = array_shift ( $first ) ;
  80                                 $ns = trim ( str_replace ( '[' , '' , $ns ) ) ;
  81                                 if ( strlen ( $ns ) == 2 OR strtolower ( $ns ) == $catlow )
  82                                 {
  83                                         $add = '[[' . $ns . ':' . implode ( ':' , $first ) . ']]' ;
  84                                         if ( strtolower ( $ns ) == $catlow ) $cat[] = $add ;
  85                                         else $ll[] = $add ;
  86                                         $x = implode ( ']]' , $y ) ;
  87                                         $t[$key] = $x ;
  88                                         $y = trim ( strtolower ( $x ) ) ;
  89                                 }
  90                         }
  91                 }
  92                 if ( count ( $cat ) ) $s .= implode ( ' ' , $cat ) . "\n" ;
  93                 if ( count ( $ll ) ) $s .= implode ( ' ' , $ll ) . "\n" ;
  94                 $t = implode ( "\n" , $t ) ;
  95
  96                 # Load whitelist
  97                 $sat = array () ; # stand-alone-templates; must be lowercase
  98                 $wl_title = Title::newFromText ( $wgMetadataWhitelist ) ;
  99                 $wl_article = new Article ( $wl_title ) ;
 100                 $wl = explode ( "\n" , $wl_article->getContent() ) ;
 101                 foreach ( $wl AS $x )
 102                 {
 103                         $isentry = false ;
 104                         $x = trim ( $x ) ;
 105                         while ( substr ( $x , 0 , 1 ) == '*' )
 106                         {
 107                                 $isentry = true ;
 108                                 $x = trim ( substr ( $x , 1 ) ) ;
 109                         }
 110                         if ( $isentry )
 111                         {
 112                                 $sat[] = strtolower ( $x ) ;
 113                         }
 114
 115                 }
 116
 117                 # Templates, but only some
 118                 $t = explode ( '{{' , $t ) ;
 119                 $tl = array () ;
 120                 foreach ( $t AS $key => $x )
 121                 {
 122                         $y = explode ( '}}' , $x , 2 ) ;
 123                         if ( count ( $y ) == 2 )
 124                         {
 125                                 $z = $y[0] ;
 126                                 $z = explode ( '|' , $z ) ;
 127                                 $tn = array_shift ( $z ) ;
 128                                 if ( in_array ( strtolower ( $tn ) , $sat ) )
 129                                 {
 130                                         $tl[] = '{{' . $y[0] . '}}' ;
 131                                         $t[$key] = $y[1] ;
 132                                         $y = explode ( '}}' , $y[1] , 2 ) ;
 133                                 }
 134                                 else $t[$key] = '{{' . $x ;
 135                         }
 136                         else if ( $key != 0 ) $t[$key] = '{{' . $x ;
 137                         else $t[$key] = $x ;
 138                 }
 139                 if ( count ( $tl ) ) $s .= implode ( ' ' , $tl ) ;
 140                 $t = implode ( '' , $t ) ;
 141
 142                 $t = str_replace ( "\n\n\n" , "\n" , $t ) ;
 143                 $this->mArticle->mContent = $t ;
 144                 $this->mMetaData = $s ;
 145         }
 146
 147         function submit() {
 148                 $this->edit();
 149         }
 150
 151         /**
 152          * This is the function that gets called for "action=edit". It
 153          * sets up various member variables, then passes execution to
 154          * another function, usually showEditForm()
 155          *
 156          * The edit form is self-submitting, so that when things like
 157          * preview and edit conflicts occur, we get the same form back
 158          * with the extra stuff added.  Only when the final submission
 159          * is made and all is well do we actually save and redirect to
 160          * the newly-edited page.
 161          */
 162         function edit() {
 163                 global $wgOut, $wgUser, $wgRequest, $wgTitle;
 164                 global $wgEmailConfirmToEdit;
 165
 166                 if ( ! wfRunHooks( 'AlternateEdit', array( &$this  ) ) )
 167                         return;
 168
 169                 $fname = 'EditPage::edit';
 170                 wfProfileIn( $fname );
 171                 wfDebug( "$fname: enter\n" );
 172
 173                 // this is not an article
 174                 $wgOut->setArticleFlag(false);
 175
 176                 $this->importFormData( $wgRequest );
 177                 $this->firsttime = false;
 178
 179                 if( $this->live ) {
 180                         $this->livePreview();
 181                         wfProfileOut( $fname );
 182                         return;
 183                 }
 184
 185                 if ( ! $this->mTitle->userCanEdit() ) {
 186                         wfDebug( "$fname: user can't edit\n" );
 187                         $wgOut->readOnlyPage( $this->mArticle->getContent(), true );
 188                         wfProfileOut( $fname );
 189                         return;
 190                 }
 191                 wfDebug( "$fname: Checking blocks\n" );
 192                 if ( !$this->preview && !$this->diff && $wgUser->isBlockedFrom( $this->mTitle, !$this->save ) ) {
 193                         # When previewing, don't check blocked state - will get caught at save time.
 194                         # Also, check when starting edition is done against slave to improve performance.
 195                         wfDebug( "$fname: user is blocked\n" );
 196                         $wgOut->blockedPage();
 197                         wfProfileOut( $fname );
 198                         return;
 199                 }
 200                 if ( !$wgUser->isAllowed('edit') ) {
 201                         if ( $wgUser->isAnon() ) {
 202                                 wfDebug( "$fname: user must log in\n" );
 203                                 $this->userNotLoggedInPage();
 204                                 wfProfileOut( $fname );
 205                                 return;
 206                         } else {
 207                                 wfDebug( "$fname: read-only page\n" );
 208                                 $wgOut->readOnlyPage( $this->mArticle->getContent(), true );
 209                                 wfProfileOut( $fname );
 210                                 return;
 211                         }
 212                 }
 213                 if ($wgEmailConfirmToEdit && !$wgUser->isEmailConfirmed()) {
 214                         wfDebug("$fname: user must confirm e-mail address\n");
 215                         $this->userNotConfirmedPage();
 216                         wfProfileOut($fname);
 217                         return;
 218                 }
 219                 if ( !$this->mTitle->userCan( 'create' ) && !$this->mTitle->exists() ) {
 220                         wfDebug( "$fname: no create permission\n" );
 221                         $this->noCreatePermission();
 222                         wfProfileOut( $fname );
 223                         return;
 224                 }
 225                 if ( wfReadOnly() ) {
 226                         wfDebug( "$fname: read-only mode is engaged\n" );
 227                         if( $this->save || $this->preview ) {
 228                                 $this->formtype = 'preview';
 229                         } else if ( $this->diff ) {
 230                                 $this->formtype = 'diff';
 231                         } else {
 232                                 $wgOut->readOnlyPage( $this->mArticle->getContent() );
 233                                 wfProfileOut( $fname );
 234                                 return;
 235                         }
 236                 } else {
 237                         if ( $this->save ) {
 238                                 $this->formtype = 'save';
 239                         } else if ( $this->preview ) {
 240                                 $this->formtype = 'preview';
 241                         } else if ( $this->diff ) {
 242                                 $this->formtype = 'diff';
 243                         } else { # First time through
 244                                 $this->firsttime = true;
 245                                 if( $this->previewOnOpen() ) {
 246                                         $this->formtype = 'preview';
 247                                 } else {
 248                                         $this->extractMetaDataFromArticle () ;
 249                                         $this->formtype = 'initial';
 250                                 }
 251                         }
 252                 }
 253
 254                 wfProfileIn( "$fname-business-end" );
 255
 256                 $this->isConflict = false;
 257                 // css / js subpages of user pages get a special treatment
 258                 $this->isCssJsSubpage      = $wgTitle->isCssJsSubpage();
 259                 $this->isValidCssJsSubpage = $wgTitle->isValidCssJsSubpage();
 260
 261                 /* Notice that we can't use isDeleted, because it returns true if article is ever deleted
 262                  * no matter it's current state
 263                  */
 264                 $this->deletedSinceEdit = false;
 265                 if ( $this->edittime != '' ) {
 266                         /* Note that we rely on logging table, which hasn't been always there,
 267                          * but that doesn't matter, because this only applies to brand new
 268                          * deletes. This is done on every preview and save request. Move it further down
 269                          * to only perform it on saves
 270                          */
 271                         if ( $this->mTitle->isDeleted() ) {
 272                                 $this->lastDelete = $this->getLastDelete();
 273                                 if ( !is_null($this->lastDelete) ) {
 274                                         $deletetime = $this->lastDelete->log_timestamp;
 275                                         if ( ($deletetime - $this->starttime) > 0 ) {
 276                                                 $this->deletedSinceEdit = true;
 277                                         }
 278                                 }
 279                         }
 280                 }
 281
 282                 if(!$this->mTitle->getArticleID() && ('initial' == $this->formtype || $this->firsttime )) { # new article
 283                         $this->showIntro();
 284                 }
 285                 if( $this->mTitle->isTalkPage() ) {
 286                         $wgOut->addWikiText( wfMsg( 'talkpagetext' ) );
 287                 }
 288
 289                 # Attempt submission here.  This will check for edit conflicts,
 290                 # and redundantly check for locked database, blocked IPs, etc.
 291                 # that edit() already checked just in case someone tries to sneak
 292                 # in the back door with a hand-edited submission URL.
 293
 294                 if ( 'save' == $this->formtype ) {
 295                         if ( !$this->attemptSave() ) {
 296                                 wfProfileOut( "$fname-business-end" );
 297                                 wfProfileOut( $fname );
 298                                 return;
 299                         }
 300                 }
 301
 302                 # First time through: get contents, set time for conflict
 303                 # checking, etc.
 304                 if ( 'initial' == $this->formtype || $this->firsttime ) {
 305                         $this->initialiseForm();
 306                 }
 307
 308                 $this->showEditForm();
 309                 wfProfileOut( "$fname-business-end" );
 310                 wfProfileOut( $fname );
 311         }
 312
 313         /**
 314          * Return true if this page should be previewed when the edit form
 315          * is initially opened.
 316          * @return bool
 317          * @private
 318          */
 319         function previewOnOpen() {
 320                 global $wgUser;
 321                 return $this->section != 'new' &&
 322                         ( ( $wgUser->getOption( 'previewonfirst' ) && $this->mTitle->exists() ) ||
 323                                 ( $this->mTitle->getNamespace() == NS_CATEGORY &&
 324                                         !$this->mTitle->exists() ) );
 325         }
 326
 327         /**
 328          * @todo document
 329          * @param $request
 330          */
 331         function importFormData( &$request ) {
 332                 global $wgLang, $wgUser;
 333                 $fname = 'EditPage::importFormData';
 334                 wfProfileIn( $fname );
 335
 336                 if( $request->wasPosted() ) {
 337                         # These fields need to be checked for encoding.
 338                         # Also remove trailing whitespace, but don't remove _initial_
 339                         # whitespace from the text boxes. This may be significant formatting.
 340                         $this->textbox1 = $this->safeUnicodeInput( $request, 'wpTextbox1' );
 341                         $this->textbox2 = $this->safeUnicodeInput( $request, 'wpTextbox2' );
 342                         $this->mMetaData = rtrim( $request->getText( 'metadata'   ) );
 343                         # Truncate for whole multibyte characters. +5 bytes for ellipsis
 344                         $this->summary   = $wgLang->truncate( $request->getText( 'wpSummary'  ), 250 );
 345
 346                         $this->edittime = $request->getVal( 'wpEdittime' );
 347                         $this->starttime = $request->getVal( 'wpStarttime' );
 348
 349                         $this->scrolltop = $request->getIntOrNull( 'wpScrolltop' );
 350
 351                         if( is_null( $this->edittime ) ) {
 352                                 # If the form is incomplete, force to preview.
 353                                 wfDebug( "$fname: Form data appears to be incomplete\n" );
 354                                 wfDebug( "POST DATA: " . var_export( $_POST, true ) . "\n" );
 355                                 $this->preview  = true;
 356                         } else {
 357                                 /* Fallback for live preview */
 358                                 $this->preview = $request->getCheck( 'wpPreview' ) || $request->getCheck( 'wpLivePreview' );
 359                                 $this->diff = $request->getCheck( 'wpDiff' );
 360
 361                                 if( !$this->preview ) {
 362                                         if ( $this->tokenOk( $request ) ) {
 363                                                 # Some browsers will not report any submit button
 364                                                 # if the user hits enter in the comment box.
 365                                                 # The unmarked state will be assumed to be a save,
 366                                                 # if the form seems otherwise complete.
 367                                                 wfDebug( "$fname: Passed token check.\n" );
 368                                         } else {
 369                                                 # Page might be a hack attempt posted from
 370                                                 # an external site. Preview instead of saving.
 371                                                 wfDebug( "$fname: Failed token check; forcing preview\n" );
 372                                                 $this->preview = true;
 373                                         }
 374                                 }
 375                         }
 376                         $this->save    = ! ( $this->preview OR $this->diff );
 377                         if( !preg_match( '/^\d{14}$/', $this->edittime )) {
 378                                 $this->edittime = null;
 379                         }
 380
 381                         if( !preg_match( '/^\d{14}$/', $this->starttime )) {
 382                                 $this->starttime = null;
 383                         }
 384
 385                         $this->recreate  = $request->getCheck( 'wpRecreate' );
 386
 387                         $this->minoredit = $request->getCheck( 'wpMinoredit' );
 388                         $this->watchthis = $request->getCheck( 'wpWatchthis' );
 389
 390                         # Don't force edit summaries when a user is editing their own user or talk page
 391                         if( ( $this->mTitle->mNamespace == NS_USER || $this->mTitle->mNamespace == NS_USER_TALK ) && $this->mTitle->getText() == $wgUser->getName() ) {
 392                                 $this->allowBlankSummary = true;
 393                         } else {
 394                                 $this->allowBlankSummary = $request->getBool( 'wpIgnoreBlankSummary' );
 395                         }
 396
 397                         $this->autoSumm = $request->getText( 'wpAutoSummary' );
 398                 } else {
 399                         # Not a posted form? Start with nothing.
 400                         wfDebug( "$fname: Not a posted form.\n" );
 401                         $this->textbox1  = '';
 402                         $this->textbox2  = '';
 403                         $this->mMetaData = '';
 404                         $this->summary   = '';
 405                         $this->edittime  = '';
 406                         $this->starttime = wfTimestampNow();
 407                         $this->preview   = false;
 408                         $this->save      = false;
 409                         $this->diff      = false;
 410                         $this->minoredit = false;
 411                         $this->watchthis = false;
 412                         $this->recreate  = false;
 413                 }
 414
 415                 $this->oldid = $request->getInt( 'oldid' );
 416
 417                 # Section edit can come from either the form or a link
 418                 $this->section = $request->getVal( 'wpSection', $request->getVal( 'section' ) );
 419
 420                 $this->live = $request->getCheck( 'live' );
 421                 $this->editintro = $request->getText( 'editintro' );
 422
 423                 wfProfileOut( $fname );
 424         }
 425
 426         /**
 427          * Make sure the form isn't faking a user's credentials.
 428          *
 429          * @param $request WebRequest
 430          * @return bool
 431          * @private
 432          */
 433         function tokenOk( &$request ) {
 434                 global $wgUser;
 435                 if( $wgUser->isAnon() ) {
 436                         # Anonymous users may not have a session
 437                         # open. Don't tokenize.
 438                         $this->mTokenOk = true;
 439                 } else {
 440                         $this->mTokenOk = $wgUser->matchEditToken( $request->getVal( 'wpEditToken' ) );
 441                 }
 442                 return $this->mTokenOk;
 443         }
 444
 445         /** */
 446         function showIntro() {
 447                 global $wgOut, $wgUser;
 448                 $addstandardintro=true;
 449                 if($this->editintro) {
 450                         $introtitle=Title::newFromText($this->editintro);
 451                         if(isset($introtitle) && $introtitle->userCanRead()) {
 452                                 $rev=Revision::newFromTitle($introtitle);
 453                                 if($rev) {
 454                                         $wgOut->addSecondaryWikiText($rev->getText());
 455                                         $addstandardintro=false;
 456                                 }
 457                         }
 458                 }
 459                 if($addstandardintro) {
 460                         if ( $wgUser->isLoggedIn() )
 461                                 $wgOut->addWikiText( wfMsg( 'newarticletext' ) );
 462                         else
 463                                 $wgOut->addWikiText( wfMsg( 'newarticletextanon' ) );
 464                 }
 465         }
 466
 467         /**
 468          * Attempt submission
 469          * @return bool false if output is done, true if the rest of the form should be displayed
 470          */
 471         function attemptSave() {
 472                 global $wgSpamRegex, $wgFilterCallback, $wgUser, $wgOut;
 473                 global $wgMaxArticleSize;
 474
 475                 $fname = 'EditPage::attemptSave';
 476                 wfProfileIn( $fname );
 477                 wfProfileIn( "$fname-checks" );
 478
 479                 # Reintegrate metadata
 480                 if ( $this->mMetaData != '' ) $this->textbox1 .= "\n" . $this->mMetaData ;
 481                 $this->mMetaData = '' ;
 482
 483                 # Check for spam
 484                 if ( $wgSpamRegex && preg_match( $wgSpamRegex, $this->textbox1, $matches ) ) {
 485                         $this->spamPage ( $matches[0] );
 486                         wfProfileOut( "$fname-checks" );
 487                         wfProfileOut( $fname );
 488                         return false;
 489                 }
 490                 if ( $wgFilterCallback && $wgFilterCallback( $this->mTitle, $this->textbox1, $this->section ) ) {
 491                         # Error messages or other handling should be performed by the filter function
 492                         wfProfileOut( $fname );
 493                         wfProfileOut( "$fname-checks" );
 494                         return false;
 495                 }
 496                 if ( !wfRunHooks( 'EditFilter', array( $this, $this->textbox1, $this->section, &$this->hookError ) ) ) {
 497                         # Error messages etc. could be handled within the hook...
 498                         wfProfileOut( $fname );
 499                         wfProfileOut( "$fname-checks" );
 500                         return false;
 501                 } elseif( $this->hookError != '' ) {
 502                         # ...or the hook could be expecting us to produce an error
 503                         wfProfileOut( "$fname-checks " );
 504                         wfProfileOut( $fname );
 505                         return true;
 506                 }
 507                 if ( $wgUser->isBlockedFrom( $this->mTitle, false ) ) {
 508                         # Check block state against master, thus 'false'.
 509                         $this->blockedIPpage();
 510                         wfProfileOut( "$fname-checks" );
 511                         wfProfileOut( $fname );
 512                         return false;
 513                 }
 514                 $this->kblength = (int)(strlen( $this->textbox1 ) / 1024);
 515                 if ( $this->kblength > $wgMaxArticleSize ) {
 516                         // Error will be displayed by showEditForm()
 517                         $this->tooBig = true;
 518                         wfProfileOut( "$fname-checks" );
 519                         wfProfileOut( $fname );
 520                         return true;
 521                 }
 522
 523                 if ( !$wgUser->isAllowed('edit') ) {
 524                         if ( $wgUser->isAnon() ) {
 525                                 $this->userNotLoggedInPage();
 526                                 wfProfileOut( "$fname-checks" );
 527                                 wfProfileOut( $fname );
 528                                 return false;
 529                         }
 530                         else {
 531                                 $wgOut->readOnlyPage();
 532                                 wfProfileOut( "$fname-checks" );
 533                                 wfProfileOut( $fname );
 534                                 return false;
 535                         }
 536                 }
 537
 538                 if ( wfReadOnly() ) {
 539                         $wgOut->readOnlyPage();
 540                         wfProfileOut( "$fname-checks" );
 541                         wfProfileOut( $fname );
 542                         return false;
 543                 }
 544                 if ( $wgUser->pingLimiter() ) {
 545                         $wgOut->rateLimited();
 546                         wfProfileOut( "$fname-checks" );
 547                         wfProfileOut( $fname );
 548                         return false;
 549                 }
 550
 551                 # If the article has been deleted while editing, don't save it without
 552                 # confirmation
 553                 if ( $this->deletedSinceEdit && !$this->recreate ) {
 554                         wfProfileOut( "$fname-checks" );
 555                         wfProfileOut( $fname );
 556                         return true;
 557                 }
 558
 559                 wfProfileOut( "$fname-checks" );
 560
 561                 # If article is new, insert it.
 562                 $aid = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
 563                 if ( 0 == $aid ) {
 564                         // Late check for create permission, just in case *PARANOIA*
 565                         if ( !$this->mTitle->userCan( 'create' ) ) {
 566                                 wfDebug( "$fname: no create permission\n" );
 567                                 $this->noCreatePermission();
 568                                 wfProfileOut( $fname );
 569                                 return;
 570                         }
 571
 572                         # Don't save a new article if it's blank.
 573                         if ( ( '' == $this->textbox1 ) ) {
 574                                         $wgOut->redirect( $this->mTitle->getFullURL() );
 575                                         wfProfileOut( $fname );
 576                                         return false;
 577                         }
 578
 579                         # If no edit comment was given when creating a new page, and what's being
 580                         # created is a redirect, be smart and fill in a neat auto-comment
 581                         if( $this->summary == '' ) {
 582                                 $rt = Title::newFromRedirect( $this->textbox1 );
 583                                 if( is_object( $rt ) )
 584                                         $this->summary = wfMsgForContent( 'autoredircomment', $rt->getPrefixedText() );
 585                         }
 586
 587                         $isComment=($this->section=='new');
 588                         $this->mArticle->insertNewArticle( $this->textbox1, $this->summary,
 589                                 $this->minoredit, $this->watchthis, false, $isComment);
 590
 591                         wfProfileOut( $fname );
 592                         return false;
 593                 }
 594
 595                 # Article exists. Check for edit conflict.
 596
 597                 $this->mArticle->clear(); # Force reload of dates, etc.
 598                 $this->mArticle->forUpdate( true ); # Lock the article
 599
 600                 if( $this->mArticle->getTimestamp() != $this->edittime ) {
 601                         $this->isConflict = true;
 602                         if( $this->section == 'new' ) {
 603                                 if( $this->mArticle->getUserText() == $wgUser->getName() &&
 604                                         $this->mArticle->getComment() == $this->summary ) {
 605                                         // Probably a duplicate submission of a new comment.
 606                                         // This can happen when squid resends a request after
 607                                         // a timeout but the first one actually went through.
 608                                         wfDebug( "EditPage::editForm duplicate new section submission; trigger edit conflict!\n" );
 609                                 } else {
 610                                         // New comment; suppress conflict.
 611                                         $this->isConflict = false;
 612                                         wfDebug( "EditPage::editForm conflict suppressed; new section\n" );
 613                                 }
 614                         }
 615                 }
 616                 $userid = $wgUser->getID();
 617
 618                 if ( $this->isConflict) {
 619                         wfDebug( "EditPage::editForm conflict! getting section '$this->section' for time '$this->edittime' (article time '" .
 620                                 $this->mArticle->getTimestamp() . "'\n" );
 621                         $text = $this->mArticle->replaceSection( $this->section, $this->textbox1, $this->summary, $this->edittime);
 622                 }
 623                 else {
 624                         wfDebug( "EditPage::editForm getting section '$this->section'\n" );
 625                         $text = $this->mArticle->replaceSection( $this->section, $this->textbox1, $this->summary);
 626                 }
 627                 if( is_null( $text ) ) {
 628                         wfDebug( "EditPage::editForm activating conflict; section replace failed.\n" );
 629                         $this->isConflict = true;
 630                         $text = $this->textbox1;
 631                 }
 632
 633                 # Suppress edit conflict with self, except for section edits where merging is required.
 634                 if ( ( $this->section == '' ) && ( 0 != $userid ) && ( $this->mArticle->getUser() == $userid ) ) {
 635                         wfDebug( "Suppressing edit conflict, same user.\n" );
 636                         $this->isConflict = false;
 637                 } else {
 638                         # switch from section editing to normal editing in edit conflict
 639                         if($this->isConflict) {
 640                                 # Attempt merge
 641                                 if( $this->mergeChangesInto( $text ) ){
 642                                         // Successful merge! Maybe we should tell the user the good news?
 643                                         $this->isConflict = false;
 644                                         wfDebug( "Suppressing edit conflict, successful merge.\n" );
 645                                 } else {
 646                                         $this->section = '';
 647                                         $this->textbox1 = $text;
 648                                         wfDebug( "Keeping edit conflict, failed merge.\n" );
 649                                 }
 650                         }
 651                 }
 652
 653                 if ( $this->isConflict ) {
 654                         wfProfileOut( $fname );
 655                         return true;
 656                 }
 657
 658                 # Handle the user preference to force summaries here
 659                 if( $this->section != 'new' && !$this->allowBlankSummary && $wgUser->getOption( 'forceeditsummary' ) ) {
 660                         if( md5( $this->summary ) == $this->autoSumm ) {
 661                                 $this->missingSummary = true;
 662                                 wfProfileOut( $fname );
 663                                 return( true );
 664                         }
 665                 }
 666
 667                 # All's well
 668                 wfProfileIn( "$fname-sectionanchor" );
 669                 $sectionanchor = '';
 670                 if( $this->section == 'new' ) {
 671                         if ( $this->textbox1 == '' ) {
 672                                 $this->missingComment = true;
 673                                 return true;
 674                         }
 675                         if( $this->summary != '' ) {
 676                                 $sectionanchor = $this->sectionAnchor( $this->summary );
 677                         }
 678                 } elseif( $this->section != '' ) {
 679                         # Try to get a section anchor from the section source, redirect to edited section if header found
 680                         # XXX: might be better to integrate this into Article::replaceSection
 681                         # for duplicate heading checking and maybe parsing
 682                         $hasmatch = preg_match( "/^ *([=]{1,6})(.*?)(\\1) *\\n/i", $this->textbox1, $matches );
 683                         # we can't deal with anchors, includes, html etc in the header for now,
 684                         # headline would need to be parsed to improve this
 685                         if($hasmatch and strlen($matches[2]) > 0) {
 686                                 $sectionanchor = $this->sectionAnchor( $matches[2] );
 687                         }
 688                 }
 689                 wfProfileOut( "$fname-sectionanchor" );
 690
 691                 // Save errors may fall down to the edit form, but we've now
 692                 // merged the section into full text. Clear the section field
 693                 // so that later submission of conflict forms won't try to
 694                 // replace that into a duplicated mess.
 695                 $this->textbox1 = $text;
 696                 $this->section = '';
 697
 698                 // Check for length errors again now that the section is merged in
 699                 $this->kblength = (int)(strlen( $text ) / 1024);
 700                 if ( $this->kblength > $wgMaxArticleSize ) {
 701                         $this->tooBig = true;
 702                         wfProfileOut( $fname );
 703                         return true;
 704                 }
 705
 706                 # update the article here
 707                 if( $this->mArticle->updateArticle( $text, $this->summary, $this->minoredit,
 708                         $this->watchthis, '', $sectionanchor ) ) {
 709                         wfProfileOut( $fname );
 710                         return false;
 711                 } else {
 712                         $this->isConflict = true;
 713                 }
 714                 wfProfileOut( $fname );
 715                 return true;
 716         }
 717
 718         /**
 719          * Initialise form fields in the object
 720          * Called on the first invocation, e.g. when a user clicks an edit link
 721          */
 722         function initialiseForm() {
 723                 $this->edittime = $this->mArticle->getTimestamp();
 724                 $this->textbox1 = $this->mArticle->getContent();
 725                 $this->summary = '';
 726                 if ( !$this->mArticle->exists() && $this->mArticle->mTitle->getNamespace() == NS_MEDIAWIKI )
 727                         $this->textbox1 = wfMsgWeirdKey ( $this->mArticle->mTitle->getText() ) ;
 728                 wfProxyCheck();
 729         }
 730
 731         /**
 732          * Send the edit form and related headers to $wgOut
 733          * @param $formCallback Optional callable that takes an OutputPage
 734          *                      parameter; will be called during form output
 735          *                      near the top, for captchas and the like.
 736          */
 737         function showEditForm( $formCallback=null ) {
 738                 global $wgOut, $wgUser, $wgLang, $wgContLang, $wgMaxArticleSize;
 739
 740                 $fname = 'EditPage::showEditForm';
 741                 wfProfileIn( $fname );
 742
 743                 $sk =& $wgUser->getSkin();
 744
 745                 wfRunHooks( 'EditPage::showEditForm:initial', array( &$this ) ) ;
 746
 747                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 748
 749                 # Enabled article-related sidebar, toplinks, etc.
 750                 $wgOut->setArticleRelated( true );
 751
 752                 if ( $this->isConflict ) {
 753                         $s = wfMsg( 'editconflict', $this->mTitle->getPrefixedText() );
 754                         $wgOut->setPageTitle( $s );
 755                         $wgOut->addWikiText( wfMsg( 'explainconflict' ) );
 756
 757                         $this->textbox2 = $this->textbox1;
 758                         $this->textbox1 = $this->mArticle->getContent();
 759                         $this->edittime = $this->mArticle->getTimestamp();
 760                 } else {
 761
 762                         if( $this->section != '' ) {
 763                                 if( $this->section == 'new' ) {
 764                                         $s = wfMsg('editingcomment', $this->mTitle->getPrefixedText() );
 765                                 } else {
 766                                         $s = wfMsg('editingsection', $this->mTitle->getPrefixedText() );
 767                                         if( !$this->preview && !$this->diff ) {
 768                                                 preg_match( "/^(=+)(.+)\\1/mi",
 769                                                         $this->textbox1,
 770                                                         $matches );
 771                                                 if( !empty( $matches[2] ) ) {
 772                                                         $this->summary = "/* ". trim($matches[2])." */ ";
 773                                                 }
 774                                         }
 775                                 }
 776                         } else {
 777                                 $s = wfMsg( 'editing', $this->mTitle->getPrefixedText() );
 778                         }
 779                         $wgOut->setPageTitle( $s );
 780
 781                         if ( $this->missingComment ) {
 782                                 $wgOut->addWikiText( wfMsg( 'missingcommenttext' ) );
 783                         }
 784
 785                         if( $this->missingSummary ) {
 786                                 $wgOut->addWikiText( wfMsg( 'missingsummary' ) );
 787                         }
 788
 789                         if( !$this->hookError == '' ) {
 790                                 $wgOut->addWikiText( $this->hookError );
 791                         }
 792
 793                         if ( !$this->checkUnicodeCompliantBrowser() ) {
 794                                 $wgOut->addWikiText( wfMsg( 'nonunicodebrowser') );
 795                         }
 796                         if ( isset( $this->mArticle )
 797                              && isset( $this->mArticle->mRevision )
 798                              && !$this->mArticle->mRevision->isCurrent() ) {
 799                                 $this->mArticle->setOldSubtitle( $this->mArticle->mRevision->getId() );
 800                                 $wgOut->addWikiText( wfMsg( 'editingold' ) );
 801                         }
 802                 }
 803
 804                 if( wfReadOnly() ) {
 805                         $wgOut->addWikiText( wfMsg( 'readonlywarning' ) );
 806                 } elseif( $wgUser->isAnon() && $this->formtype != 'preview' ) {
 807                         $wgOut->addWikiText( wfMsg( 'anoneditwarning' ) );
 808                 } else {
 809                         if( $this->isCssJsSubpage && $this->formtype != 'preview' ) {
 810                                 # Check the skin exists
 811                                 if( $this->isValidCssJsSubpage ) {
 812                                         $wgOut->addWikiText( wfMsg( 'usercssjsyoucanpreview' ) );
 813                                 } else {
 814                                         $wgOut->addWikiText( wfMsg( 'userinvalidcssjstitle', $this->mTitle->getSkinFromCssJsSubpage() ) );
 815                                 }
 816                         }
 817                 }
 818
 819                 if( $this->mTitle->isProtected( 'edit' ) ) {
 820                         # Is the protection due to the namespace, e.g. interface text?
 821                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 822                                 # Yes; remind the user
 823                                 $notice = wfMsg( 'editinginterface' );
 824                         } elseif( $this->mTitle->isSemiProtected() ) {
 825                                 # No; semi protected
 826                                 $notice = wfMsg( 'semiprotectedpagewarning' );
 827                                 if( wfEmptyMsg( 'semiprotectedpagewarning', $notice ) || $notice == '-' ) {
 828                                         $notice = '';
 829                                 }
 830                         } else {
 831                                 # No; regular protection
 832                                 $notice = wfMsg( 'protectedpagewarning' );
 833                         }
 834                         $wgOut->addWikiText( $notice );
 835                 }
 836
 837                 if ( $this->kblength === false ) {
 838                         $this->kblength = (int)(strlen( $this->textbox1 ) / 1024);
 839                 }
 840                 if ( $this->tooBig || $this->kblength > $wgMaxArticleSize ) {
 841                         $wgOut->addWikiText( wfMsg( 'longpageerror', $wgLang->formatNum( $this->kblength ), $wgMaxArticleSize ) );
 842                 } elseif( $this->kblength > 29 ) {
 843                         $wgOut->addWikiText( wfMsg( 'longpagewarning', $wgLang->formatNum( $this->kblength ) ) );
 844                 }
 845
 846                 $rows = $wgUser->getIntOption( 'rows' );
 847                 $cols = $wgUser->getIntOption( 'cols' );
 848
 849                 $ew = $wgUser->getOption( 'editwidth' );
 850                 if ( $ew ) $ew = " style=\"width:100%\"";
 851                 else $ew = '';
 852
 853                 $q = 'action=submit';
 854                 #if ( "no" == $redirect ) { $q .= "&redirect=no"; }
 855                 $action = $this->mTitle->escapeLocalURL( $q );
 856
 857                 $summary = wfMsg('summary');
 858                 $subject = wfMsg('subject');
 859                 $minor   = wfMsgExt('minoredit', array('parseinline'));
 860                 $watchthis = wfMsgExt('watchthis', array('parseinline'));
 861
 862                 $cancel = $sk->makeKnownLink( $this->mTitle->getPrefixedText(),
 863                                 wfMsgExt('cancel', array('parseinline')) );
 864                 $edithelpurl = $sk->makeInternalOrExternalUrl( wfMsgForContent( 'edithelppage' ));
 865                 $edithelp = '<a target="helpwindow" href="'.$edithelpurl.'">'.
 866                         htmlspecialchars( wfMsg( 'edithelp' ) ).'</a> '.
 867                         htmlspecialchars( wfMsg( 'newwindow' ) );
 868
 869                 global $wgRightsText;
 870                 $copywarn = "<div id=\"editpage-copywarn\">\n" .
 871                         wfMsg( $wgRightsText ? 'copyrightwarning' : 'copyrightwarning2',
 872                                 '[[' . wfMsgForContent( 'copyrightpage' ) . ']]',
 873                                 $wgRightsText ) . "\n</div>";
 874
 875                 if( $wgUser->getOption('showtoolbar') and !$this->isCssJsSubpage ) {
 876                         # prepare toolbar for edit buttons
 877                         $toolbar = $this->getEditToolbar();
 878                 } else {
 879                         $toolbar = '';
 880                 }
 881
 882                 // activate checkboxes if user wants them to be always active
 883                 if( !$this->preview && !$this->diff ) {
 884                         # Sort out the "watch" checkbox
 885                         if( $wgUser->getOption( 'watchdefault' ) ) {
 886                                 # Watch all edits
 887                                 $this->watchthis = true;
 888                         } elseif( $wgUser->getOption( 'watchcreations' ) && !$this->mTitle->exists() ) {
 889                                 # Watch creations
 890                                 $this->watchthis = true;
 891                         } elseif( $this->mTitle->userIsWatching() ) {
 892                                 # Already watched
 893                                 $this->watchthis = true;
 894                         }
 895
 896                         if( $wgUser->getOption( 'minordefault' ) ) $this->minoredit = true;
 897                 }
 898
 899                 $minoredithtml = '';
 900
 901                 if ( $wgUser->isAllowed('minoredit') ) {
 902                         $minoredithtml =
 903                                 "<input tabindex='3' type='checkbox' value='1' name='wpMinoredit'".($this->minoredit?" checked='checked'":"").
 904                                 " accesskey='".wfMsg('accesskey-minoredit')."' id='wpMinoredit' />\n".
 905                                 "<label for='wpMinoredit' title='".wfMsg('tooltip-minoredit')."'>{$minor}</label>\n";
 906                 }
 907
 908                 $watchhtml = '';
 909
 910                 if ( $wgUser->isLoggedIn() ) {
 911                         $watchhtml = "<input tabindex='4' type='checkbox' name='wpWatchthis'".
 912                                 ($this->watchthis?" checked='checked'":"").
 913                                 " accesskey=\"".htmlspecialchars(wfMsg('accesskey-watch'))."\" id='wpWatchthis'  />\n".
 914                                 "<label for='wpWatchthis' title=\"" .
 915                                         htmlspecialchars(wfMsg('tooltip-watch'))."\">{$watchthis}</label>\n";
 916                 }
 917
 918                 $checkboxhtml = $minoredithtml . $watchhtml;
 919
 920                 if ( $wgUser->getOption( 'previewontop' ) ) {
 921
 922                         if ( 'preview' == $this->formtype ) {
 923                                 $this->showPreview();
 924                         } else {
 925                                 $wgOut->addHTML( '<div id="wikiPreview"></div>' );
 926                         }
 927
 928                         if ( 'diff' == $this->formtype ) {
 929                                 $wgOut->addHTML( $this->getDiff() );
 930                         }
 931                 }
 932
 933
 934                 # if this is a comment, show a subject line at the top, which is also the edit summary.
 935                 # Otherwise, show a summary field at the bottom
 936                 $summarytext = htmlspecialchars( $wgContLang->recodeForEdit( $this->summary ) ); # FIXME
 937                 if( $this->section == 'new' ) {
 938                         $commentsubject="<span id='wpSummaryLabel'><label for='wpSummary'>{$subject}:</label></span>\n<div class='editOptions'>\n<input tabindex='1' type='text' value=\"$summarytext\" name='wpSummary' id='wpSummary' maxlength='200' size='60' /><br />";
 939                         $editsummary = '';
 940                 } else {
 941                         $commentsubject = '';
 942                         $editsummary="<span id='wpSummaryLabel'><label for='wpSummary'>{$summary}:</label></span>\n<div class='editOptions'>\n<input tabindex='2' type='text' value=\"$summarytext\" name='wpSummary' id='wpSummary' maxlength='200' size='60' /><br />";
 943                 }
 944
 945                 # Set focus to the edit box on load, except on preview or diff, where it would interfere with the display
 946                 if( !$this->preview && !$this->diff ) {
 947                         $wgOut->setOnloadHandler( 'document.editform.wpTextbox1.focus()' );
 948                 }
 949                 $templates = $this->formatTemplates();
 950
 951                 global $wgUseMetadataEdit ;
 952                 if ( $wgUseMetadataEdit ) {
 953                         $metadata = $this->mMetaData ;
 954                         $metadata = htmlspecialchars( $wgContLang->recodeForEdit( $metadata ) ) ;
 955                         $top = wfMsgWikiHtml( 'metadata_help' );
 956                         $metadata = $top . "<textarea name='metadata' rows='3' cols='{$cols}'{$ew}>{$metadata}</textarea>" ;
 957                 }
 958                 else $metadata = "" ;
 959
 960                 $hidden = '';
 961                 $recreate = '';
 962                 if ($this->deletedSinceEdit) {
 963                         if ( 'save' != $this->formtype ) {
 964                                 $wgOut->addWikiText( wfMsg('deletedwhileediting'));
 965                         } else {
 966                                 // Hide the toolbar and edit area, use can click preview to get it back
 967                                 // Add an confirmation checkbox and explanation.
 968                                 $toolbar = '';
 969                                 $hidden = 'type="hidden" style="display:none;"';
 970                                 $recreate = $wgOut->parse( wfMsg( 'confirmrecreate',  $this->lastDelete->user_name , $this->lastDelete->log_comment ));
 971                                 $recreate .=
 972                                         "<br /><input tabindex='1' type='checkbox' value='1' name='wpRecreate' id='wpRecreate' />".
 973                                         "<label for='wpRecreate' title='".wfMsg('tooltip-recreate')."'>". wfMsg('recreate')."</label>";
 974                         }
 975                 }
 976
 977                 $temp = array(
 978                         'id'        => 'wpSave',
 979                         'name'      => 'wpSave',
 980                         'type'      => 'submit',
 981                         'tabindex'  => '5',
 982                         'value'     => wfMsg('savearticle'),
 983                         'accesskey' => wfMsg('accesskey-save'),
 984                         'title'     => wfMsg('tooltip-save'),
 985                 );
 986                 $buttons['save'] = wfElement('input', $temp, '');
 987                 $temp = array(
 988                         'id'        => 'wpDiff',
 989                         'name'      => 'wpDiff',
 990                         'type'      => 'submit',
 991                         'tabindex'  => '7',
 992                         'value'     => wfMsg('showdiff'),
 993                         'accesskey' => wfMsg('accesskey-diff'),
 994                         'title'     => wfMsg('tooltip-diff'),
 995                 );
 996                 $buttons['diff'] = wfElement('input', $temp, '');
 997
 998                 global $wgLivePreview;
 999                 if ( $wgLivePreview && $wgUser->getOption( 'uselivepreview' ) ) {
1000                         $temp = array(
1001                                 'id'        => 'wpPreview',
1002                                 'name'      => 'wpPreview',
1003                                 'type'      => 'submit',
1004                                 'tabindex'  => '6',
1005                                 'value'     => wfMsg('showpreview'),
1006                                 'accesskey' => '',
1007                                 'title'     => wfMsg('tooltip-preview'),
1008                                 'style'     => 'display: none;',
1009                         );
1010                         $buttons['preview'] = wfElement('input', $temp, '');
1011                         $temp = array(
1012                                 'id'        => 'wpLivePreview',
1013                                 'name'      => 'wpLivePreview',
1014                                 'type'      => 'submit',
1015                                 'tabindex'  => '6',
1016                                 'value'     => wfMsg('showlivepreview'),
1017                                 'accesskey' => wfMsg('accesskey-preview'),
1018                                 'title'     => '',
1019                                 'onclick'   => $this->doLivePreviewScript(),
1020                         );
1021                         $buttons['live'] = wfElement('input', $temp, '');
1022                 } else {
1023                         $temp = array(
1024                                 'id'        => 'wpPreview',
1025                                 'name'      => 'wpPreview',
1026                                 'type'      => 'submit',
1027                                 'tabindex'  => '6',
1028                                 'value'     => wfMsg('showpreview'),
1029                                 'accesskey' => wfMsg('accesskey-preview'),
1030                                 'title'     => wfMsg('tooltip-preview'),
1031                         );
1032                         $buttons['preview'] = wfElement('input', $temp, '');
1033                         $buttons['live'] = '';
1034                 }
1035
1036                 $safemodehtml = $this->checkUnicodeCompliantBrowser()
1037                         ? ""
1038                         : "<input type='hidden' name=\"safemode\" value='1' />\n";
1039
1040                 $wgOut->addHTML( <<<END
1041 {$toolbar}
1042 <form id="editform" name="editform" method="post" action="$action" enctype="multipart/form-data">
1043 END
1044 );
1045
1046                 if( is_callable( $formCallback ) ) {
1047                         call_user_func_array( $formCallback, array( &$wgOut ) );
1048                 }
1049
1050                 // Put these up at the top to ensure they aren't lost on early form submission
1051                 $wgOut->addHTML( "
1052 <input type='hidden' value=\"" . htmlspecialchars( $this->section ) . "\" name=\"wpSection\" />
1053 <input type='hidden' value=\"{$this->starttime}\" name=\"wpStarttime\" />\n
1054 <input type='hidden' value=\"{$this->edittime}\" name=\"wpEdittime\" />\n
1055 <input type='hidden' value=\"{$this->scrolltop}\" name=\"wpScrolltop\" id=\"wpScrolltop\" />\n" );
1056
1057                 $wgOut->addHTML( <<<END
1058 $recreate
1059 {$commentsubject}
1060 <textarea tabindex='1' accesskey="," name="wpTextbox1" id="wpTextbox1" rows='{$rows}'
1061 cols='{$cols}'{$ew} $hidden>
1062 END
1063 . htmlspecialchars( $this->safeUnicodeOutput( $this->textbox1 ) ) .
1064 "
1065 </textarea>
1066                 " );
1067
1068                 $wgOut->addWikiText( $copywarn );
1069                 $wgOut->addHTML( "
1070 {$metadata}
1071 {$editsummary}
1072 {$checkboxhtml}
1073 {$safemodehtml}
1074 ");
1075
1076                 $wgOut->addHTML(
1077 "<div class='editButtons'>
1078         {$buttons['save']}
1079         {$buttons['preview']}
1080         {$buttons['live']}
1081         {$buttons['diff']}
1082         <span class='editHelp'>{$cancel} | {$edithelp}</span>
1083 </div><!-- editButtons -->
1084 </div><!-- editOptions -->");
1085
1086                 $wgOut->addWikiText( wfMsgForContent( 'edittools' ) );
1087
1088                 $wgOut->addHTML( "
1089 <div class='templatesUsed'>
1090 {$templates}
1091 </div>
1092 " );
1093
1094                 if ( $wgUser->isLoggedIn() ) {
1095                         /**
1096                          * To make it harder for someone to slip a user a page
1097                          * which submits an edit form to the wiki without their
1098                          * knowledge, a random token is associated with the login
1099                          * session. If it's not passed back with the submission,
1100                          * we won't save the page, or render user JavaScript and
1101                          * CSS previews.
1102                          */
1103                         $token = htmlspecialchars( $wgUser->editToken() );
1104                         $wgOut->addHTML( "\n<input type='hidden' value=\"$token\" name=\"wpEditToken\" />\n" );
1105                 }
1106
1107                 # If a blank edit summary was previously provided, and the appropriate
1108                 # user preference is active, pass a hidden tag here. This will stop the
1109                 # user being bounced back more than once in the event that a summary
1110                 # is not required.
1111                 if( $this->missingSummary ) {
1112                         $wgOut->addHTML( "<input type=\"hidden\" name=\"wpIgnoreBlankSummary\" value=\"1\" />\n" );
1113                 }
1114
1115                 # For a bit more sophisticated detection of blank summaries, hash the
1116                 # automatic one and pass that in a hidden field.
1117                 $autosumm = $this->autoSumm ? $this->autoSumm : md5( $this->summary );
1118                 $wgOut->addHTML( "<input type=\"hidden\" name=\"wpAutoSummary\" value=\"$autosumm\" />\n" );
1119
1120                 if ( $this->isConflict ) {
1121                         require_once( "DifferenceEngine.php" );
1122                         $wgOut->addWikiText( '==' . wfMsg( "yourdiff" ) . '==' );
1123
1124                         $de = new DifferenceEngine( $this->mTitle );
1125                         $de->setText( $this->textbox2, $this->textbox1 );
1126                         $de->showDiff( wfMsg( "yourtext" ), wfMsg( "storedversion" ) );
1127
1128                         $wgOut->addWikiText( '==' . wfMsg( "yourtext" ) . '==' );
1129                         $wgOut->addHTML( "<textarea tabindex=6 id='wpTextbox2' name=\"wpTextbox2\" rows='{$rows}' cols='{$cols}' wrap='virtual'>"
1130                                 . htmlspecialchars( $this->safeUnicodeOutput( $this->textbox2 ) ) . "\n</textarea>" );
1131                 }
1132                 $wgOut->addHTML( "</form>\n" );
1133                 if ( !$wgUser->getOption( 'previewontop' ) ) {
1134
1135                         if ( $this->formtype == 'preview') {
1136                                 $this->showPreview();
1137                         } else {
1138                                 $wgOut->addHTML( '<div id="wikiPreview"></div>' );
1139                         }
1140
1141                         if ( $this->formtype == 'diff') {
1142                                 $wgOut->addHTML( $this->getDiff() );
1143                         }
1144
1145                 }
1146
1147                 wfProfileOut( $fname );
1148         }
1149
1150         /**
1151          * Append preview output to $wgOut.
1152          * Includes category rendering if this is a category page.
1153          * @private
1154          */
1155         function showPreview() {
1156                 global $wgOut;
1157                 $wgOut->addHTML( '<div id="wikiPreview">' );
1158                 if($this->mTitle->getNamespace() == NS_CATEGORY) {
1159                         $this->mArticle->openShowCategory();
1160                 }
1161                 $previewOutput = $this->getPreviewText();
1162                 $wgOut->addHTML( $previewOutput );
1163                 if($this->mTitle->getNamespace() == NS_CATEGORY) {
1164                         $this->mArticle->closeShowCategory();
1165                 }
1166                 $wgOut->addHTML( "<br style=\"clear:both;\" />\n" );
1167                 $wgOut->addHTML( '</div>' );
1168         }
1169
1170         /**
1171          * Prepare a list of templates used by this page. Returns HTML.
1172          */
1173         function formatTemplates() {
1174                 global $wgUser;
1175
1176                 $fname = 'EditPage::formatTemplates';
1177                 wfProfileIn( $fname );
1178
1179                 $sk =& $wgUser->getSkin();
1180
1181                 $outText = '';
1182                 $templates = $this->mArticle->getUsedTemplates();
1183                 if ( count( $templates ) > 0 ) {
1184                         # Do a batch existence check
1185                         $batch = new LinkBatch;
1186                         foreach( $templates as $title ) {
1187                                 $batch->addObj( $title );
1188                         }
1189                         $batch->execute();
1190
1191                         # Construct the HTML
1192                         $outText = '<br />'. wfMsgExt( 'templatesused', array( 'parseinline' ) ) . '<ul>';
1193                         foreach ( $templates as $titleObj ) {
1194                                 $outText .= '<li>' . $sk->makeLinkObj( $titleObj ) . '</li>';
1195                         }
1196                         $outText .= '</ul>';
1197                 }
1198                 wfProfileOut( $fname );
1199                 return $outText;
1200         }
1201
1202         /**
1203          * Live Preview lets us fetch rendered preview page content and
1204          * add it to the page without refreshing the whole page.
1205          * If not supported by the browser it will fall through to the normal form
1206          * submission method.
1207          *
1208          * This function outputs a script tag to support live preview, and
1209          * returns an onclick handler which should be added to the attributes
1210          * of the preview button
1211          */
1212         function doLivePreviewScript() {
1213                 global $wgStylePath, $wgJsMimeType, $wgOut, $wgTitle;
1214                 $wgOut->addHTML( '<script type="'.$wgJsMimeType.'" src="' .
1215                         htmlspecialchars( $wgStylePath . '/common/preview.js' ) .
1216                         '"></script>' . "\n" );
1217                 $liveAction = $wgTitle->getLocalUrl( 'action=submit&wpPreview=true&live=true' );
1218                 return "return !livePreview(" .
1219                         "getElementById('wikiPreview')," .
1220                         "editform.wpTextbox1.value," .
1221                         '"' . $liveAction . '"' . ")";
1222         }
1223
1224         function getLastDelete() {
1225                 $dbr =& wfGetDB( DB_SLAVE );
1226                 $fname = 'EditPage::getLastDelete';
1227                 $res = $dbr->select(
1228                         array( 'logging', 'user' ),
1229                         array( 'log_type',
1230                                'log_action',
1231                                'log_timestamp',
1232                                'log_user',
1233                                'log_namespace',
1234                                'log_title',
1235                                'log_comment',
1236                                'log_params',
1237                                'user_name', ),
1238                         array( 'log_namespace' => $this->mTitle->getNamespace(),
1239                                'log_title' => $this->mTitle->getDBkey(),
1240                                'log_type' => 'delete',
1241                                'log_action' => 'delete',
1242                                'user_id=log_user' ),
1243                         $fname,
1244                         array( 'LIMIT' => 1, 'ORDER BY' => 'log_timestamp DESC' ) );
1245
1246                 if($dbr->numRows($res) == 1) {
1247                         while ( $x = $dbr->fetchObject ( $res ) )
1248                                 $data = $x;
1249                         $dbr->freeResult ( $res ) ;
1250                 } else {
1251                         $data = null;
1252                 }
1253                 return $data;
1254         }
1255
1256         /**
1257          * @todo document
1258          */
1259         function getPreviewText() {
1260                 global $wgOut, $wgUser, $wgTitle, $wgParser;
1261
1262                 $fname = 'EditPage::getPreviewText';
1263                 wfProfileIn( $fname );
1264
1265                 if ( $this->mTokenOk ) {
1266                         $msg = 'previewnote';
1267                 } else {
1268                         $msg = 'session_fail_preview';
1269                 }
1270                 $previewhead = '<h2>' . htmlspecialchars( wfMsg( 'preview' ) ) . "</h2>\n" .
1271                         "<div class='previewnote'>" . $wgOut->parse( wfMsg( $msg ) ) . "</div>\n";
1272                 if ( $this->isConflict ) {
1273                         $previewhead.='<h2>' . htmlspecialchars( wfMsg( 'previewconflict' ) ) . "</h2>\n";
1274                 }
1275
1276                 $parserOptions = ParserOptions::newFromUser( $wgUser );
1277                 $parserOptions->setEditSection( false );
1278
1279                 # don't parse user css/js, show message about preview
1280                 # XXX: stupid php bug won't let us use $wgTitle->isCssJsSubpage() here
1281
1282                 if ( $this->isCssJsSubpage ) {
1283                         if(preg_match("/\\.css$/", $wgTitle->getText() ) ) {
1284                                 $previewtext = wfMsg('usercsspreview');
1285                         } else if(preg_match("/\\.js$/", $wgTitle->getText() ) ) {
1286                                 $previewtext = wfMsg('userjspreview');
1287                         }
1288                         $parserOptions->setTidy(true);
1289                         $parserOutput = $wgParser->parse( $previewtext , $wgTitle, $parserOptions );
1290                         $wgOut->addHTML( $parserOutput->mText );
1291                         wfProfileOut( $fname );
1292                         return $previewhead;
1293                 } else {
1294                         # if user want to see preview when he edit an article
1295                         if( $wgUser->getOption('previewonfirst') and ($this->textbox1 == '')) {
1296                                 $this->textbox1 = $this->mArticle->getContent();
1297                         }
1298
1299                         $toparse = $this->textbox1;
1300
1301                         # If we're adding a comment, we need to show the
1302                         # summary as the headline
1303                         if($this->section=="new" && $this->summary!="") {
1304                                 $toparse="== {$this->summary} ==\n\n".$toparse;
1305                         }
1306
1307                         if ( $this->mMetaData != "" ) $toparse .= "\n" . $this->mMetaData ;
1308                         $parserOptions->setTidy(true);
1309                         $parserOutput = $wgParser->parse( $this->mArticle->preSaveTransform( $toparse ) ."\n\n",
1310                                         $wgTitle, $parserOptions );
1311
1312                         $previewHTML = $parserOutput->getText();
1313                         $wgOut->addParserOutputNoText( $parserOutput );
1314
1315                         wfProfileOut( $fname );
1316                         return $previewhead .
1317                         '<div id="realContent"' . contentdir() . '>' .
1318                         $previewHTML .
1319                         '</div><!-- realContent -->';
1320                 }
1321         }
1322
1323         /**
1324          * Call the stock "user is blocked" page
1325          */
1326         function blockedIPpage() {
1327                 global $wgOut;
1328                 $wgOut->blockedPage();
1329         }
1330
1331         /**
1332          * Produce the stock "please login to edit pages" page
1333          */
1334         function userNotLoggedInPage() {
1335                 global $wgUser, $wgOut;
1336                 $skin = $wgUser->getSkin();
1337
1338                 $loginTitle = Title::makeTitle( NS_SPECIAL, 'Userlogin' );
1339                 $loginLink = $skin->makeKnownLinkObj( $loginTitle, wfMsgHtml( 'loginreqlink' ), 'returnto=' . $this->mTitle->getPrefixedUrl() );
1340
1341                 $wgOut->setPageTitle( wfMsg( 'whitelistedittitle' ) );
1342                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1343                 $wgOut->setArticleRelated( false );
1344
1345                 $wgOut->addHtml( wfMsgWikiHtml( 'whitelistedittext', $loginLink ) );
1346                 $wgOut->returnToMain( false, $this->mTitle->getPrefixedUrl() );
1347         }
1348
1349         /**
1350          * Creates a basic error page which informs the user that
1351          * they have to validate their email address before being
1352          * allowed to edit.
1353          */
1354         function userNotConfirmedPage() {
1355                 global $wgOut;
1356
1357                 $wgOut->setPageTitle( wfMsg( 'confirmedittitle' ) );
1358                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1359                 $wgOut->setArticleRelated( false );
1360
1361                 $wgOut->addWikiText( wfMsg( 'confirmedittext' ) );
1362                 $wgOut->returnToMain( false );
1363         }
1364
1365         /**
1366          * Produce the stock "your edit contains spam" page
1367          *
1368          * @param $match Text which triggered one or more filters
1369          */
1370         function spamPage( $match = false ) {
1371                 global $wgOut;
1372
1373                 $wgOut->setPageTitle( wfMsg( 'spamprotectiontitle' ) );
1374                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1375                 $wgOut->setArticleRelated( false );
1376
1377                 $wgOut->addWikiText( wfMsg( 'spamprotectiontext' ) );
1378                 if ( $match )
1379                         $wgOut->addWikiText( wfMsg( 'spamprotectionmatch', "<nowiki>{$match}</nowiki>" ) );
1380
1381                 $wgOut->returnToMain( false );
1382         }
1383
1384         /**
1385          * @private
1386          * @todo document
1387          */
1388         function mergeChangesInto( &$editText ){
1389                 $fname = 'EditPage::mergeChangesInto';
1390                 wfProfileIn( $fname );
1391
1392                 $db =& wfGetDB( DB_MASTER );
1393
1394                 // This is the revision the editor started from
1395                 $baseRevision = Revision::loadFromTimestamp(
1396                         $db, $this->mArticle->mTitle, $this->edittime );
1397                 if( is_null( $baseRevision ) ) {
1398                         wfProfileOut( $fname );
1399                         return false;
1400                 }
1401                 $baseText = $baseRevision->getText();
1402
1403                 // The current state, we want to merge updates into it
1404                 $currentRevision =  Revision::loadFromTitle(
1405                         $db, $this->mArticle->mTitle );
1406                 if( is_null( $currentRevision ) ) {
1407                         wfProfileOut( $fname );
1408                         return false;
1409                 }
1410                 $currentText = $currentRevision->getText();
1411
1412                 if( wfMerge( $baseText, $editText, $currentText, $result ) ){
1413                         $editText = $result;
1414                         wfProfileOut( $fname );
1415                         return true;
1416                 } else {
1417                         wfProfileOut( $fname );
1418                         return false;
1419                 }
1420         }
1421
1422         /**
1423          * Check if the browser is on a blacklist of user-agents known to
1424          * mangle UTF-8 data on form submission. Returns true if Unicode
1425          * should make it through, false if it's known to be a problem.
1426          * @return bool
1427          * @private
1428          */
1429         function checkUnicodeCompliantBrowser() {
1430                 global $wgBrowserBlackList;
1431                 if( empty( $_SERVER["HTTP_USER_AGENT"] ) ) {
1432                         // No User-Agent header sent? Trust it by default...
1433                         return true;
1434                 }
1435                 $currentbrowser = $_SERVER["HTTP_USER_AGENT"];
1436                 foreach ( $wgBrowserBlackList as $browser ) {
1437                         if ( preg_match($browser, $currentbrowser) ) {
1438                                 return false;
1439                         }
1440                 }
1441                 return true;
1442         }
1443
1444         /**
1445          * Format an anchor fragment as it would appear for a given section name
1446          * @param string $text
1447          * @return string
1448          * @private
1449          */
1450         function sectionAnchor( $text ) {
1451                 $headline = Sanitizer::decodeCharReferences( $text );
1452                 # strip out HTML
1453                 $headline = preg_replace( '/<.*?' . '>/', '', $headline );
1454                 $headline = trim( $headline );
1455                 $sectionanchor = '#' . urlencode( str_replace( ' ', '_', $headline ) );
1456                 $replacearray = array(
1457                         '%3A' => ':',
1458                         '%' => '.'
1459                 );
1460                 return str_replace(
1461                         array_keys( $replacearray ),
1462                         array_values( $replacearray ),
1463                         $sectionanchor );
1464         }
1465
1466         /**
1467          * Shows a bulletin board style toolbar for common editing functions.
1468          * It can be disabled in the user preferences.
1469          * The necessary JavaScript code can be found in style/wikibits.js.
1470          */
1471         function getEditToolbar() {
1472                 global $wgStylePath, $wgContLang, $wgJsMimeType;
1473
1474                 /**
1475                  * toolarray an array of arrays which each include the filename of
1476                  * the button image (without path), the opening tag, the closing tag,
1477                  * and optionally a sample text that is inserted between the two when no
1478                  * selection is highlighted.
1479                  * The tip text is shown when the user moves the mouse over the button.
1480                  *
1481                  * Already here are accesskeys (key), which are not used yet until someone
1482                  * can figure out a way to make them work in IE. However, we should make
1483                  * sure these keys are not defined on the edit page.
1484                  */
1485                 $toolarray=array(
1486                         array(  'image'=>'button_bold.png',
1487                                         'open'  =>      "\'\'\'",
1488                                         'close' =>      "\'\'\'",
1489                                         'sample'=>      wfMsg('bold_sample'),
1490                                         'tip'   =>      wfMsg('bold_tip'),
1491                                         'key'   =>      'B'
1492                                 ),
1493                         array(  'image'=>'button_italic.png',
1494                                         'open'  =>      "\'\'",
1495                                         'close' =>      "\'\'",
1496                                         'sample'=>      wfMsg('italic_sample'),
1497                                         'tip'   =>      wfMsg('italic_tip'),
1498                                         'key'   =>      'I'
1499                                 ),
1500                         array(  'image'=>'button_link.png',
1501                                         'open'  =>      '[[',
1502                                         'close' =>      ']]',
1503                                         'sample'=>      wfMsg('link_sample'),
1504                                         'tip'   =>      wfMsg('link_tip'),
1505                                         'key'   =>      'L'
1506                                 ),
1507                         array(  'image'=>'button_extlink.png',
1508                                         'open'  =>      '[',
1509                                         'close' =>      ']',
1510                                         'sample'=>      wfMsg('extlink_sample'),
1511                                         'tip'   =>      wfMsg('extlink_tip'),
1512                                         'key'   =>      'X'
1513                                 ),
1514                         array(  'image'=>'button_headline.png',
1515                                         'open'  =>      "\\n== ",
1516                                         'close' =>      " ==\\n",
1517                                         'sample'=>      wfMsg('headline_sample'),
1518                                         'tip'   =>      wfMsg('headline_tip'),
1519                                         'key'   =>      'H'
1520                                 ),
1521                         array(  'image'=>'button_image.png',
1522                                         'open'  =>      '[['.$wgContLang->getNsText(NS_IMAGE).":",
1523                                         'close' =>      ']]',
1524                                         'sample'=>      wfMsg('image_sample'),
1525                                         'tip'   =>      wfMsg('image_tip'),
1526                                         'key'   =>      'D'
1527                                 ),
1528                         array(  'image' =>'button_media.png',
1529                                         'open'  =>      '[['.$wgContLang->getNsText(NS_MEDIA).':',
1530                                         'close' =>      ']]',
1531                                         'sample'=>      wfMsg('media_sample'),
1532                                         'tip'   =>      wfMsg('media_tip'),
1533                                         'key'   =>      'M'
1534                                 ),
1535                         array(  'image' =>'button_math.png',
1536                                         'open'  =>      "<math>",
1537                                         'close' =>      "<\\/math>",
1538                                         'sample'=>      wfMsg('math_sample'),
1539                                         'tip'   =>      wfMsg('math_tip'),
1540                                         'key'   =>      'C'
1541                                 ),
1542                         array(  'image' =>'button_nowiki.png',
1543                                         'open'  =>      "<nowiki>",
1544                                         'close' =>      "<\\/nowiki>",
1545                                         'sample'=>      wfMsg('nowiki_sample'),
1546                                         'tip'   =>      wfMsg('nowiki_tip'),
1547                                         'key'   =>      'N'
1548                                 ),
1549                         array(  'image' =>'button_sig.png',
1550                                         'open'  =>      '--~~~~',
1551                                         'close' =>      '',
1552                                         'sample'=>      '',
1553                                         'tip'   =>      wfMsg('sig_tip'),
1554                                         'key'   =>      'Y'
1555                                 ),
1556                         array(  'image' =>'button_hr.png',
1557                                         'open'  =>      "\\n----\\n",
1558                                         'close' =>      '',
1559                                         'sample'=>      '',
1560                                         'tip'   =>      wfMsg('hr_tip'),
1561                                         'key'   =>      'R'
1562                                 )
1563                 );
1564                 $toolbar = "<div id='toolbar'>\n";
1565                 $toolbar.="<script type='$wgJsMimeType'>\n/*<![CDATA[*/\n";
1566
1567                 foreach($toolarray as $tool) {
1568
1569                         $image=$wgStylePath.'/common/images/'.$tool['image'];
1570                         $open=$tool['open'];
1571                         $close=$tool['close'];
1572                         $sample = wfEscapeJsString( $tool['sample'] );
1573
1574                         // Note that we use the tip both for the ALT tag and the TITLE tag of the image.
1575                         // Older browsers show a "speedtip" type message only for ALT.
1576                         // Ideally these should be different, realistically they
1577                         // probably don't need to be.
1578                         $tip = wfEscapeJsString( $tool['tip'] );
1579
1580                         #$key = $tool["key"];
1581
1582                         $toolbar.="addButton('$image','$tip','$open','$close','$sample');\n";
1583                 }
1584
1585                 $toolbar.="/*]]>*/\n</script>";
1586                 $toolbar.="\n</div>";
1587                 return $toolbar;
1588         }
1589
1590         /**
1591          * Output preview text only. This can be sucked into the edit page
1592          * via JavaScript, and saves the server time rendering the skin as
1593          * well as theoretically being more robust on the client (doesn't
1594          * disturb the edit box's undo history, won't eat your text on
1595          * failure, etc).
1596          *
1597          * @todo This doesn't include category or interlanguage links.
1598          *       Would need to enhance it a bit, maybe wrap them in XML
1599          *       or something... that might also require more skin
1600          *       initialization, so check whether that's a problem.
1601          */
1602         function livePreview() {
1603                 global $wgOut;
1604                 $wgOut->disable();
1605                 header( 'Content-type: text/xml' );
1606                 header( 'Cache-control: no-cache' );
1607                 # FIXME
1608                 echo $this->getPreviewText( );
1609                 /* To not shake screen up and down between preview and live-preview */
1610                 echo "<br style=\"clear:both;\" />\n";
1611         }
1612
1613
1614         /**
1615          * Get a diff between the current contents of the edit box and the
1616          * version of the page we're editing from.
1617          *
1618          * If this is a section edit, we'll replace the section as for final
1619          * save and then make a comparison.
1620          *
1621          * @return string HTML
1622          */
1623         function getDiff() {
1624                 require_once( 'DifferenceEngine.php' );
1625                 $oldtext = $this->mArticle->fetchContent();
1626                 $newtext = $this->mArticle->replaceSection(
1627                         $this->section, $this->textbox1, $this->summary, $this->edittime );
1628                 $newtext = $this->mArticle->preSaveTransform( $newtext );
1629                 $oldtitle = wfMsgExt( 'currentrev', array('parseinline') );
1630                 $newtitle = wfMsgExt( 'yourtext', array('parseinline') );
1631                 if ( $oldtext !== false  || $newtext != '' ) {
1632                         $de = new DifferenceEngine( $this->mTitle );
1633                         $de->setText( $oldtext, $newtext );
1634                         $difftext = $de->getDiff( $oldtitle, $newtitle );
1635                 } else {
1636                         $difftext = '';
1637                 }
1638
1639                 return '<div id="wikiDiff">' . $difftext . '</div>';
1640         }
1641
1642         /**
1643          * Filter an input field through a Unicode de-armoring process if it
1644          * came from an old browser with known broken Unicode editing issues.
1645          *
1646          * @param WebRequest $request
1647          * @param string $field
1648          * @return string
1649          * @private
1650          */
1651         function safeUnicodeInput( $request, $field ) {
1652                 $text = rtrim( $request->getText( $field ) );
1653                 return $request->getBool( 'safemode' )
1654                         ? $this->unmakesafe( $text )
1655                         : $text;
1656         }
1657
1658         /**
1659          * Filter an output field through a Unicode armoring process if it is
1660          * going to an old browser with known broken Unicode editing issues.
1661          *
1662          * @param string $text
1663          * @return string
1664          * @private
1665          */
1666         function safeUnicodeOutput( $text ) {
1667                 global $wgContLang;
1668                 $codedText = $wgContLang->recodeForEdit( $text );
1669                 return $this->checkUnicodeCompliantBrowser()
1670                         ? $codedText
1671                         : $this->makesafe( $codedText );
1672         }
1673
1674         /**
1675          * A number of web browsers are known to corrupt non-ASCII characters
1676          * in a UTF-8 text editing environment. To protect against this,
1677          * detected browsers will be served an armored version of the text,
1678          * with non-ASCII chars converted to numeric HTML character references.
1679          *
1680          * Preexisting such character references will have a 0 added to them
1681          * to ensure that round-trips do not alter the original data.
1682          *
1683          * @param string $invalue
1684          * @return string
1685          * @private
1686          */
1687         function makesafe( $invalue ) {
1688                 // Armor existing references for reversability.
1689                 $invalue = strtr( $invalue, array( "&#x" => "&#x0" ) );
1690
1691                 $bytesleft = 0;
1692                 $result = "";
1693                 $working = 0;
1694                 for( $i = 0; $i < strlen( $invalue ); $i++ ) {
1695                         $bytevalue = ord( $invalue{$i} );
1696                         if( $bytevalue <= 0x7F ) { //0xxx xxxx
1697                                 $result .= chr( $bytevalue );
1698                                 $bytesleft = 0;
1699                         } elseif( $bytevalue <= 0xBF ) { //10xx xxxx
1700                                 $working = $working << 6;
1701                                 $working += ($bytevalue & 0x3F);
1702                                 $bytesleft--;
1703                                 if( $bytesleft <= 0 ) {
1704                                         $result .= "&#x" . strtoupper( dechex( $working ) ) . ";";
1705                                 }
1706                         } elseif( $bytevalue <= 0xDF ) { //110x xxxx
1707                                 $working = $bytevalue & 0x1F;
1708                                 $bytesleft = 1;
1709                         } elseif( $bytevalue <= 0xEF ) { //1110 xxxx
1710                                 $working = $bytevalue & 0x0F;
1711                                 $bytesleft = 2;
1712                         } else { //1111 0xxx
1713                                 $working = $bytevalue & 0x07;
1714                                 $bytesleft = 3;
1715                         }
1716                 }
1717                 return $result;
1718         }
1719
1720         /**
1721          * Reverse the previously applied transliteration of non-ASCII characters
1722          * back to UTF-8. Used to protect data from corruption by broken web browsers
1723          * as listed in $wgBrowserBlackList.
1724          *
1725          * @param string $invalue
1726          * @return string
1727          * @private
1728          */
1729         function unmakesafe( $invalue ) {
1730                 $result = "";
1731                 for( $i = 0; $i < strlen( $invalue ); $i++ ) {
1732                         if( ( substr( $invalue, $i, 3 ) == "&#x" ) && ( $invalue{$i+3} != '0' ) ) {
1733                                 $i += 3;
1734                                 $hexstring = "";
1735                                 do {
1736                                         $hexstring .= $invalue{$i};
1737                                         $i++;
1738                                 } while( ctype_xdigit( $invalue{$i} ) && ( $i < strlen( $invalue ) ) );
1739
1740                                 // Do some sanity checks. These aren't needed for reversability,
1741                                 // but should help keep the breakage down if the editor
1742                                 // breaks one of the entities whilst editing.
1743                                 if ((substr($invalue,$i,1)==";") and (strlen($hexstring) <= 6)) {
1744                                         $codepoint = hexdec($hexstring);
1745                                         $result .= codepointToUtf8( $codepoint );
1746                                 } else {
1747                                         $result .= "&#x" . $hexstring . substr( $invalue, $i, 1 );
1748                                 }
1749                         } else {
1750                                 $result .= substr( $invalue, $i, 1 );
1751                         }
1752                 }
1753                 // reverse the transform that we made for reversability reasons.
1754                 return strtr( $result, array( "&#x0" => "&#x" ) );
1755         }
1756
1757         function noCreatePermission() {
1758                 global $wgOut;
1759                 $wgOut->setPageTitle( wfMsg( 'nocreatetitle' ) );
1760                 $wgOut->addWikiText( wfMsg( 'nocreatetext' ) );
1761         }
1762
1763 }
1764
1765 ?>