Make a note about the reserved word problem.

[mediawiki.git] / includes / EditPage.php

<?php
/**
 * Contains the EditPage class
 */

/**
 * The edit page/HTML interface (split from Article)
 * The actual database and text munging is still in Article,
 * but it should get easier to call those from alternate
 * interfaces.
 *
 * EditPage cares about two distinct titles:
 * $wgTitle is the page that forms submit to, links point to,
 * redirects go to, etc. $this->mTitle (as well as $mArticle) is the
 * page in the database that is actually being edited. These are
 * usually the same, but they are now allowed to be different.
 */
class EditPage {
        const AS_SUCCESS_UPDATE                         = 200;
        const AS_SUCCESS_NEW_ARTICLE            = 201;
        const AS_HOOK_ERROR                                     = 210;
        const AS_FILTERING                                      = 211;
        const AS_HOOK_ERROR_EXPECTED            = 212;
        const AS_BLOCKED_PAGE_FOR_USER          = 215;
        const AS_CONTENT_TOO_BIG                        = 216;
        const AS_USER_CANNOT_EDIT                       = 217;
        const AS_READ_ONLY_PAGE_ANON            = 218;
        const AS_READ_ONLY_PAGE_LOGGED          = 219;
        const AS_READ_ONLY_PAGE                         = 220;
        const AS_RATE_LIMITED                           = 221;
        const AS_ARTICLE_WAS_DELETED            = 222;
        const AS_NO_CREATE_PERMISSION           = 223;
        const AS_BLANK_ARTICLE                          = 224;
        const AS_CONFLICT_DETECTED                      = 225;
        const AS_SUMMARY_NEEDED                         = 226;
        const AS_TEXTBOX_EMPTY                          = 228;
        const AS_MAX_ARTICLE_SIZE_EXCEDED       = 229;
        const AS_OK                                                     = 230;
        const AS_END                                            = 231;
        const AS_SPAM_ERROR                                     = 232;

        var $mArticle;
        var $mTitle;
        var $mMetaData = '';
        var $isConflict = false;
        var $isCssJsSubpage = false;
        var $deletedSinceEdit = false;
        var $formtype;
        var $firsttime;
        var $lastDelete;
        var $mTokenOk = false;
        var $mTokenOkExceptSuffix = false;
        var $mTriedSave = false;
        var $tooBig = false;
        var $kblength = false;
        var $missingComment = false;
        var $missingSummary = false;
        var $allowBlankSummary = false;
        var $autoSumm = '';
        var $hookError = '';
        var $mPreviewTemplates;

        # Form values
        var $save = false, $preview = false, $diff = false;
        var $minoredit = false, $watchthis = false, $recreate = false;
        var $textbox1 = '', $textbox2 = '', $summary = '';
        var $edittime = '', $section = '', $starttime = '';
        var $oldid = 0, $editintro = '', $scrolltop = null;

        # Placeholders for text injection by hooks (must be HTML)
        # extensions should take care to _append_ to the present value
        public $editFormPageTop; // Before even the preview
        public $editFormTextTop;
        public $editFormTextBeforeContent;
        public $editFormTextAfterWarn;
        public $editFormTextAfterTools;
        public $editFormTextBottom;
        
        /* $didSave should be set to true whenever an article was succesfully altered. */
        public $didSave = false;
        
        public $suppressIntro = false;

        /**
         * @todo document
         * @param $article
         */
        function EditPage( $article ) {
                global $wgTitle;
                $this->mArticle =& $article;
                $this->mTitle = $article->getTitle();

                # Placeholders for text injection by hooks (empty per default)
                $this->editFormPageTop =
                $this->editFormTextTop =
                $this->editFormTextBeforeContent =
                $this->editFormTextAfterWarn =
                $this->editFormTextAfterTools =
                $this->editFormTextBottom = "";
        }
        
        /**
         * Fetch initial editing page content.
         */
        private function getContent( $def_text = '' ) {
                global $wgOut, $wgRequest, $wgParser;

                # Get variables from query string :P
                $section = $wgRequest->getVal( 'section' );
                $preload = $wgRequest->getVal( 'preload' );
                $undoafter = $wgRequest->getVal( 'undoafter' );
                $undo = $wgRequest->getVal( 'undo' );

                wfProfileIn( __METHOD__ );

                $text = '';
                if( !$this->mTitle->exists() ) {
                        if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
                                # If this is a system message, get the default text. 
                                $text = wfMsgWeirdKey ( $this->mTitle->getText() ) ;
                        } else {
                                # If requested, preload some text.
                                $text = $this->getPreloadedText( $preload );
                        }
                        # We used to put MediaWiki:Newarticletext here if
                        # $text was empty at this point.
                        # This is now shown above the edit box instead.
                } else {
                        // FIXME: may be better to use Revision class directly
                        // But don't mess with it just yet. Article knows how to
                        // fetch the page record from the high-priority server,
                        // which is needed to guarantee we don't pick up lagged
                        // information.

                        $text = $this->mArticle->getContent();

                        if ($undo > 0 && $undoafter > 0 && $undo < $undoafter) {
                                # If they got undoafter and undo round the wrong way, switch them
                                list( $undo, $undoafter ) = array( $undoafter, $undo );
                        }

                        if ( $undo > 0 && $undo > $undoafter ) {
                                # Undoing a specific edit overrides section editing; section-editing
                                # doesn't work with undoing.
                                if ( $undoafter ) {
                                        $undorev = Revision::newFromId($undo);
                                        $oldrev = Revision::newFromId($undoafter);
                                } else {
                                        $undorev = Revision::newFromId($undo);
                                        $oldrev = $undorev ? $undorev->getPrevious() : null;
                                }

                                #Sanity check, make sure it's the right page.
                                # Otherwise, $text will be left as-is.
                                if ( !is_null($undorev) && !is_null($oldrev) && $undorev->getPage()==$oldrev->getPage() && $undorev->getPage()==$this->mArticle->getID() ) {
                                        $undorev_text = $undorev->getText();
                                        $oldrev_text = $oldrev->getText();
                                        $currev_text = $text;

                                        #No use doing a merge if it's just a straight revert.
                                        if ( $currev_text != $undorev_text ) {
                                                $result = wfMerge($undorev_text, $oldrev_text, $currev_text, $text);
                                        } else {
                                                $text = $oldrev_text;
                                                $result = true;
                                        }
                                } else {
                                        // Failed basic sanity checks.
                                        // Older revisions may have been removed since the link
                                        // was created, or we may simply have got bogus input.
                                        $result = false;
                                }

                                if( $result ) {
                                        # Inform the user of our success and set an automatic edit summary
                                        $this->editFormPageTop .= $wgOut->parse( wfMsgNoTrans( 'undo-success' ) );
                                        $firstrev = $oldrev->getNext();
                                        # If we just undid one rev, use an autosummary
                                        if ( $firstrev->mId == $undo ) {
                                                $this->summary = wfMsgForContent('undo-summary', $undo, $undorev->getUserText());
                                        }
                                        $this->formtype = 'diff';
                                } else {
                                        # Warn the user that something went wrong
                                        $this->editFormPageTop .= $wgOut->parse( wfMsgNoTrans( 'undo-failure' ) );
                                }
                        } else if( $section != '' ) {
                                if( $section == 'new' ) {
                                        $text = $this->getPreloadedText( $preload );
                                } else {
                                        $text = $wgParser->getSection( $text, $section, $def_text );
                                }
                        }
                }

                wfProfileOut( __METHOD__ );
                return $text;
        }

        /**
         * Get the contents of a page from its title and remove includeonly tags
         *
         * @param $preload String: the title of the page.
         * @return string The contents of the page.
         */
        private function getPreloadedText($preload) {
                if ( $preload === '' )
                        return '';
                else {
                        $preloadTitle = Title::newFromText( $preload );
                        if ( isset( $preloadTitle ) && $preloadTitle->userCanRead() ) {
                                $rev=Revision::newFromTitle($preloadTitle);
                                if ( is_object( $rev ) ) {
                                        $text = $rev->getText();
                                        // TODO FIXME: AAAAAAAAAAA, this shouldn't be implementing
                                        // its own mini-parser! -ævar
                                        $text = preg_replace( '~</?includeonly>~', '', $text );
                                        return $text;
                                } else
                                        return '';
                        }
                }
        }

        /**
         * This is the function that extracts metadata from the article body on the first view.
         * To turn the feature on, set $wgUseMetadataEdit = true ; in LocalSettings
         *  and set $wgMetadataWhitelist to the *full* title of the template whitelist
         */
        function extractMetaDataFromArticle () {
                global $wgUseMetadataEdit , $wgMetadataWhitelist , $wgLang ;
                $this->mMetaData = '' ;
                if ( !$wgUseMetadataEdit ) return ;
                if ( $wgMetadataWhitelist == '' ) return ;
                $s = '' ;
                $t = $this->getContent();

                # MISSING : <nowiki> filtering

                # Categories and language links
                $t = explode ( "\n" , $t ) ;
                $catlow = strtolower ( $wgLang->getNsText ( NS_CATEGORY ) ) ;
                $cat = $ll = array() ;
                foreach ( $t AS $key => $x )
                {
                        $y = trim ( strtolower ( $x ) ) ;
                        while ( substr ( $y , 0 , 2 ) == '[[' )
                        {
                                $y = explode ( ']]' , trim ( $x ) ) ;
                                $first = array_shift ( $y ) ;
                                $first = explode ( ':' , $first ) ;
                                $ns = array_shift ( $first ) ;
                                $ns = trim ( str_replace ( '[' , '' , $ns ) ) ;
                                if ( strlen ( $ns ) == 2 OR strtolower ( $ns ) == $catlow )
                                {
                                        $add = '[[' . $ns . ':' . implode ( ':' , $first ) . ']]' ;
                                        if ( strtolower ( $ns ) == $catlow ) $cat[] = $add ;
                                        else $ll[] = $add ;
                                        $x = implode ( ']]' , $y ) ;
                                        $t[$key] = $x ;
                                        $y = trim ( strtolower ( $x ) ) ;
                                }
                        }
                }
                if ( count ( $cat ) ) $s .= implode ( ' ' , $cat ) . "\n" ;
                if ( count ( $ll ) ) $s .= implode ( ' ' , $ll ) . "\n" ;
                $t = implode ( "\n" , $t ) ;

                # Load whitelist
                $sat = array () ; # stand-alone-templates; must be lowercase
                $wl_title = Title::newFromText ( $wgMetadataWhitelist ) ;
                $wl_article = new Article ( $wl_title ) ;
                $wl = explode ( "\n" , $wl_article->getContent() ) ;
                foreach ( $wl AS $x )
                {
                        $isentry = false ;
                        $x = trim ( $x ) ;
                        while ( substr ( $x , 0 , 1 ) == '*' )
                        {
                                $isentry = true ;
                                $x = trim ( substr ( $x , 1 ) ) ;
                        }
                        if ( $isentry )
                        {
                                $sat[] = strtolower ( $x ) ;
                        }

                }

                # Templates, but only some
                $t = explode ( '{{' , $t ) ;
                $tl = array () ;
                foreach ( $t AS $key => $x )
                {
                        $y = explode ( '}}' , $x , 2 ) ;
                        if ( count ( $y ) == 2 )
                        {
                                $z = $y[0] ;
                                $z = explode ( '|' , $z ) ;
                                $tn = array_shift ( $z ) ;
                                if ( in_array ( strtolower ( $tn ) , $sat ) )
                                {
                                        $tl[] = '{{' . $y[0] . '}}' ;
                                        $t[$key] = $y[1] ;
                                        $y = explode ( '}}' , $y[1] , 2 ) ;
                                }
                                else $t[$key] = '{{' . $x ;
                        }
                        else if ( $key != 0 ) $t[$key] = '{{' . $x ;
                        else $t[$key] = $x ;
                }
                if ( count ( $tl ) ) $s .= implode ( ' ' , $tl ) ;
                $t = implode ( '' , $t ) ;

                $t = str_replace ( "\n\n\n" , "\n" , $t ) ;
                $this->mArticle->mContent = $t ;
                $this->mMetaData = $s ;
        }

        function submit() {
                $this->edit();
        }

        /**
         * This is the function that gets called for "action=edit". It
         * sets up various member variables, then passes execution to
         * another function, usually showEditForm()
         *
         * The edit form is self-submitting, so that when things like
         * preview and edit conflicts occur, we get the same form back
         * with the extra stuff added.  Only when the final submission
         * is made and all is well do we actually save and redirect to
         * the newly-edited page.
         */
        function edit() {
                global $wgOut, $wgUser, $wgRequest, $wgTitle;

                if ( ! wfRunHooks( 'AlternateEdit', array( &$this ) ) )
                        return;

                $fname = 'EditPage::edit';
                wfProfileIn( $fname );
                wfDebug( "$fname: enter\n" );

                // this is not an article
                $wgOut->setArticleFlag(false);

                $this->importFormData( $wgRequest );
                $this->firsttime = false;

                if( $this->live ) {
                        $this->livePreview();
                        wfProfileOut( $fname );
                        return;
                }

                $permErrors = $this->mTitle->getUserPermissionsErrors('edit', $wgUser);
                if( !$this->mTitle->exists() )
                        $permErrors += array_diff( $this->mTitle->getUserPermissionsErrors('create', $wgUser), $permErrors );

                # Ignore some permissions errors.
                $remove = array();
                foreach( $permErrors as $error ) {
                        if ($this->preview || $this->diff &&
                                ($error[0] == 'blockedtext' || $error[0] == 'autoblockedtext'))
                        {
                                // Don't worry about blocks when previewing/diffing
                                $remove[] = $error;
                        }

                        if ($error[0] == 'readonlytext')
                        {
                                if ($this->edit) {
                                        $this->formtype = 'preview';
                                } elseif ($this->save || $this->preview || $this->diff) {
                                        $remove[] = $error;
                                }
                        }
                }
                # array_diff returns elements in $permErrors that are not in $remove.
                $permErrors = array_diff( $permErrors, $remove );

                if ( !empty($permErrors) )
                {
                        wfDebug( "$fname: User can't edit\n" );
                        $wgOut->readOnlyPage( $this->getContent(), true, $permErrors );
                        wfProfileOut( $fname );
                        return;
                } else {
                        if ( $this->save ) {
                                $this->formtype = 'save';
                        } else if ( $this->preview ) {
                                $this->formtype = 'preview';
                        } else if ( $this->diff ) {
                                $this->formtype = 'diff';
                        } else { # First time through
                                $this->firsttime = true;
                                if( $this->previewOnOpen() ) {
                                        $this->formtype = 'preview';
                                } else {
                                        $this->extractMetaDataFromArticle () ;
                                        $this->formtype = 'initial';
                                }
                        }
                }

                wfProfileIn( "$fname-business-end" );

                $this->isConflict = false;
                // css / js subpages of user pages get a special treatment
                $this->isCssJsSubpage      = $this->mTitle->isCssJsSubpage();
                $this->isValidCssJsSubpage = $this->mTitle->isValidCssJsSubpage();

                /* Notice that we can't use isDeleted, because it returns true if article is ever deleted
                 * no matter it's current state
                 */
                $this->deletedSinceEdit = false;
                if ( $this->edittime != '' ) {
                        /* Note that we rely on logging table, which hasn't been always there,
                         * but that doesn't matter, because this only applies to brand new
                         * deletes. This is done on every preview and save request. Move it further down
                         * to only perform it on saves
                         */
                        if ( $this->mTitle->isDeleted() ) {
                                $this->lastDelete = $this->getLastDelete();
                                if ( !is_null($this->lastDelete) ) {
                                        $deletetime = $this->lastDelete->log_timestamp;
                                        if ( ($deletetime - $this->starttime) > 0 ) {
                                                $this->deletedSinceEdit = true;
                                        }
                                }
                        }
                }

                # Show applicable editing introductions
                if( $this->formtype == 'initial' || $this->firsttime )
                        $this->showIntro();
        
                if( $this->mTitle->isTalkPage() ) {
                        $wgOut->addWikiText( wfMsg( 'talkpagetext' ) );
                }

                # Attempt submission here.  This will check for edit conflicts,
                # and redundantly check for locked database, blocked IPs, etc.
                # that edit() already checked just in case someone tries to sneak
                # in the back door with a hand-edited submission URL.

                if ( 'save' == $this->formtype ) {
                        if ( !$this->attemptSave() ) {
                                wfProfileOut( "$fname-business-end" );
                                wfProfileOut( $fname );
                                return;
                        }
                }

                # First time through: get contents, set time for conflict
                # checking, etc.
                if ( 'initial' == $this->formtype || $this->firsttime ) {
                        if ($this->initialiseForm() === false) {
                                $this->noSuchSectionPage();
                                wfProfileOut( "$fname-business-end" );
                                wfProfileOut( $fname );
                                return;
                        }
                        if( !$this->mTitle->getArticleId() ) 
                                wfRunHooks( 'EditFormPreloadText', array( &$this->textbox1, &$this->mTitle ) );
                }

                $this->showEditForm();
                wfProfileOut( "$fname-business-end" );
                wfProfileOut( $fname );
        }

        /**
         * Should we show a preview when the edit form is first shown?
         *
         * @return bool
         */
        private function previewOnOpen() {
                global $wgRequest, $wgUser;
                if( $wgRequest->getVal( 'preview' ) == 'yes' ) {
                        // Explicit override from request
                        return true;
                } elseif( $wgRequest->getVal( 'preview' ) == 'no' ) {
                        // Explicit override from request
                        return false;
                } elseif( $this->section == 'new' ) {
                        // Nothing *to* preview for new sections
                        return false;
                } elseif( ( $wgRequest->getVal( 'preload' ) !== '' || $this->mTitle->exists() ) && $wgUser->getOption( 'previewonfirst' ) ) {
                        // Standard preference behaviour
                        return true;
                } elseif( !$this->mTitle->exists() && $this->mTitle->getNamespace() == NS_CATEGORY ) {
                        // Categories are special
                        return true;
                } else {
                        return false;
                }
        }

        /**
         * @todo document
         * @param $request
         */
        function importFormData( &$request ) {
                global $wgLang, $wgUser;
                $fname = 'EditPage::importFormData';
                wfProfileIn( $fname );

                if( $request->wasPosted() ) {
                        # These fields need to be checked for encoding.
                        # Also remove trailing whitespace, but don't remove _initial_
                        # whitespace from the text boxes. This may be significant formatting.
                        $this->textbox1 = $this->safeUnicodeInput( $request, 'wpTextbox1' );
                        $this->textbox2 = $this->safeUnicodeInput( $request, 'wpTextbox2' );
                        $this->mMetaData = rtrim( $request->getText( 'metadata'   ) );
                        # Truncate for whole multibyte characters. +5 bytes for ellipsis
                        $this->summary   = $wgLang->truncate( $request->getText( 'wpSummary'  ), 250 );

                        $this->edittime = $request->getVal( 'wpEdittime' );
                        $this->starttime = $request->getVal( 'wpStarttime' );

                        $this->scrolltop = $request->getIntOrNull( 'wpScrolltop' );

                        if( is_null( $this->edittime ) ) {
                                # If the form is incomplete, force to preview.
                                wfDebug( "$fname: Form data appears to be incomplete\n" );
                                wfDebug( "POST DATA: " . var_export( $_POST, true ) . "\n" );
                                $this->preview  = true;
                        } else {
                                /* Fallback for live preview */
                                $this->preview = $request->getCheck( 'wpPreview' ) || $request->getCheck( 'wpLivePreview' );
                                $this->diff = $request->getCheck( 'wpDiff' );

                                // Remember whether a save was requested, so we can indicate
                                // if we forced preview due to session failure.
                                $this->mTriedSave = !$this->preview;

                                if ( $this->tokenOk( $request ) ) {
                                        # Some browsers will not report any submit button
                                        # if the user hits enter in the comment box.
                                        # The unmarked state will be assumed to be a save,
                                        # if the form seems otherwise complete.
                                        wfDebug( "$fname: Passed token check.\n" );
                                } else if ( $this->diff ) {
                                        # Failed token check, but only requested "Show Changes".
                                        wfDebug( "$fname: Failed token check; Show Changes requested.\n" );
                                } else {
                                        # Page might be a hack attempt posted from
                                        # an external site. Preview instead of saving.
                                        wfDebug( "$fname: Failed token check; forcing preview\n" );
                                        $this->preview = true;
                                }
                        }
                        $this->save    = ! ( $this->preview OR $this->diff );
                        if( !preg_match( '/^\d{14}$/', $this->edittime )) {
                                $this->edittime = null;
                        }

                        if( !preg_match( '/^\d{14}$/', $this->starttime )) {
                                $this->starttime = null;
                        }

                        $this->recreate  = $request->getCheck( 'wpRecreate' );

                        $this->minoredit = $request->getCheck( 'wpMinoredit' );
                        $this->watchthis = $request->getCheck( 'wpWatchthis' );

                        # Don't force edit summaries when a user is editing their own user or talk page
                        if( ( $this->mTitle->mNamespace == NS_USER || $this->mTitle->mNamespace == NS_USER_TALK ) && $this->mTitle->getText() == $wgUser->getName() ) {
                                $this->allowBlankSummary = true;
                        } else {
                                $this->allowBlankSummary = $request->getBool( 'wpIgnoreBlankSummary' );
                        }

                        $this->autoSumm = $request->getText( 'wpAutoSummary' ); 
                } else {
                        # Not a posted form? Start with nothing.
                        wfDebug( "$fname: Not a posted form.\n" );
                        $this->textbox1  = '';
                        $this->textbox2  = '';
                        $this->mMetaData = '';
                        $this->summary   = '';
                        $this->edittime  = '';
                        $this->starttime = wfTimestampNow();
                        $this->edit      = false;
                        $this->preview   = false;
                        $this->save      = false;
                        $this->diff      = false;
                        $this->minoredit = false;
                        $this->watchthis = false;
                        $this->recreate  = false;
                }

                $this->oldid = $request->getInt( 'oldid' );

                # Section edit can come from either the form or a link
                $this->section = $request->getVal( 'wpSection', $request->getVal( 'section' ) );

                $this->live = $request->getCheck( 'live' );
                $this->editintro = $request->getText( 'editintro' );

                wfProfileOut( $fname );
        }

        /**
         * Make sure the form isn't faking a user's credentials.
         *
         * @param $request WebRequest
         * @return bool
         * @private
         */
        function tokenOk( &$request ) {
                global $wgUser;
                $token = $request->getVal( 'wpEditToken' );
                $this->mTokenOk = $wgUser->matchEditToken( $token );
                $this->mTokenOkExceptSuffix = $wgUser->matchEditTokenNoSuffix( $token );
                return $this->mTokenOk;
        }

        /**
         * Show all applicable editing introductions
         */
        private function showIntro() {
                global $wgOut, $wgUser;
                if( $this->suppressIntro )
                        return;

                # Show a warning message when someone creates/edits a user (talk) page but the user does not exists
                if( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
                        $parts = explode( '/', $this->mTitle->getText(), 2 );
                        $username = $parts[0];
                        $id = User::idFromName( $username );
                        $ip = User::isIP( $username );

                        if ( $id == 0 && !$ip ) {
                                $wgOut->addWikiText( '<div class="mw-userpage-userdoesnotexist error">' . wfMsg( 'userpage-userdoesnotexist', $username ) . '</div>' );
                        }
                }

                if( !$this->showCustomIntro() && !$this->mTitle->exists() ) {
                        if( $wgUser->isLoggedIn() ) {
                                $wgOut->addWikiText( '<div class="mw-newarticletext">' . wfMsg( 'newarticletext' ) . '</div>' );
                        } else {
                                $wgOut->addWikiText( '<div class="mw-newarticletextanon">' . wfMsg( 'newarticletextanon' ) . '</div>' );
                        }
                        $this->showDeletionLog( $wgOut );
                }
        }

        /**
         * Attempt to show a custom editing introduction, if supplied
         *
         * @return bool
         */
        private function showCustomIntro() {
                if( $this->editintro ) {
                        $title = Title::newFromText( $this->editintro );
                        if( $title instanceof Title && $title->exists() && $title->userCanRead() ) {
                                global $wgOut;
                                $revision = Revision::newFromTitle( $title );
                                $wgOut->addSecondaryWikiText( $revision->getText() );
                                return true;
                        } else {
                                return false;
                        }
                } else {
                        return false;
                }
        }

        /**
         * Attempt submission (no UI)
         * @return one of the constants describing the result
         */
        function internalAttemptSave( &$result ) {
                global $wgSpamRegex, $wgFilterCallback, $wgUser, $wgOut, $wgParser;
                global $wgMaxArticleSize, $wgTitle;

                $fname = 'EditPage::attemptSave';
                wfProfileIn( $fname );
                wfProfileIn( "$fname-checks" );

                if( !wfRunHooks( 'EditPage::attemptSave', array( &$this ) ) )
                {
                        wfDebug( "Hook 'EditPage::attemptSave' aborted article saving" );
                        return self::AS_HOOK_ERROR;
                }

                # Reintegrate metadata
                if ( $this->mMetaData != '' ) $this->textbox1 .= "\n" . $this->mMetaData ;
                $this->mMetaData = '' ;

                # Check for spam
                $matches = array();
                if ( $wgSpamRegex && preg_match( $wgSpamRegex, $this->textbox1, $matches ) ) {
                        $result['spam'] = $matches[0];
                        wfProfileOut( "$fname-checks" );
                        wfProfileOut( $fname );
                        return self::AS_SPAM_ERROR;
                }
                if ( $wgFilterCallback && $wgFilterCallback( $this->mTitle, $this->textbox1, $this->section ) ) {
                        # Error messages or other handling should be performed by the filter function
                        wfProfileOut( "$fname-checks" );
                        wfProfileOut( $fname );
                        return self::AS_FILTERING;
                }
                if ( !wfRunHooks( 'EditFilter', array( $this, $this->textbox1, $this->section, &$this->hookError ) ) ) {
                        # Error messages etc. could be handled within the hook...
                        wfProfileOut( "$fname-checks" );
                        wfProfileOut( $fname );
                        return self::AS_HOOK_ERROR;
                } elseif( $this->hookError != '' ) {
                        # ...or the hook could be expecting us to produce an error
                        wfProfileOut( "$fname-checks" );
                        wfProfileOut( $fname );
                        return self::AS_HOOK_ERROR_EXPECTED;
                }
                if ( $wgUser->isBlockedFrom( $wgTitle, false ) ) {
                        # Check block state against master, thus 'false'.
                        wfProfileOut( "$fname-checks" );
                        wfProfileOut( $fname );
                        return self::AS_BLOCKED_PAGE_FOR_USER;
                }
                $this->kblength = (int)(strlen( $this->textbox1 ) / 1024);
                if ( $this->kblength > $wgMaxArticleSize ) {
                        // Error will be displayed by showEditForm()
                        $this->tooBig = true;
                        wfProfileOut( "$fname-checks" );
                        wfProfileOut( $fname );
                        return self::AS_CONTENT_TOO_BIG;
                }

                if ( !$wgUser->isAllowed('edit') ) {
                        if ( $wgUser->isAnon() ) {
                                wfProfileOut( "$fname-checks" );
                                wfProfileOut( $fname );
                                return self::AS_READ_ONLY_PAGE_ANON;
                        }
                        else {
                                wfProfileOut( "$fname-checks" );
                                wfProfileOut( $fname );
                                return self::AS_READ_ONLY_PAGE_LOGGED;
                        }
                }

                if ( wfReadOnly() ) {
                        wfProfileOut( "$fname-checks" );
                        wfProfileOut( $fname );
                        return self::AS_READ_ONLY_PAGE;
                }
                if ( $wgUser->pingLimiter() ) {
                        wfProfileOut( "$fname-checks" );
                        wfProfileOut( $fname );
                        return self::AS_RATE_LIMITED;
                }

                # If the article has been deleted while editing, don't save it without
                # confirmation
                if ( $this->deletedSinceEdit && !$this->recreate ) {
                        wfProfileOut( "$fname-checks" );
                        wfProfileOut( $fname );
                        return self::AS_ARTICLE_WAS_DELETED;
                }

                wfProfileOut( "$fname-checks" );

                # If article is new, insert it.
                $aid = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
                if ( 0 == $aid ) {

                        // Late check for create permission, just in case *PARANOIA*
                        if ( !$this->mTitle->userCan( 'create' ) ) {
                                wfDebug( "$fname: no create permission\n" );
                                wfProfileOut( $fname );
                                return self::AS_NO_CREATE_PERMISSION;
                        }

                        # Don't save a new article if it's blank.
                        if ( ( '' == $this->textbox1 ) ) {
                                        wfProfileOut( $fname );
                                        return self::AS_BLANK_ARTICLE;
                        }

                        // Run post-section-merge edit filter
                        if ( !wfRunHooks( 'EditFilterMerged', array( $this, $this->textbox1, &$this->hookError ) ) ) {
                                # Error messages etc. could be handled within the hook...
                                wfProfileOut( $fname );
                                return false;
                        }

                        $isComment = ( $this->section == 'new' );
                        
                        $this->mArticle->insertNewArticle( $this->textbox1, $this->summary,
                                $this->minoredit, $this->watchthis, false, $isComment);

                        wfProfileOut( $fname );
                        return self::AS_SUCCESS_NEW_ARTICLE;
                }

                # Article exists. Check for edit conflict.

                $this->mArticle->clear(); # Force reload of dates, etc.
                $this->mArticle->forUpdate( true ); # Lock the article

                wfDebug("timestamp: {$this->mArticle->getTimestamp()}, edittime: {$this->edittime}\n");

                if( $this->mArticle->getTimestamp() != $this->edittime ) {
                        $this->isConflict = true;
                        if( $this->section == 'new' ) {
                                if( $this->mArticle->getUserText() == $wgUser->getName() &&
                                        $this->mArticle->getComment() == $this->summary ) {
                                        // Probably a duplicate submission of a new comment.
                                        // This can happen when squid resends a request after
                                        // a timeout but the first one actually went through.
                                        wfDebug( "EditPage::editForm duplicate new section submission; trigger edit conflict!\n" );
                                } else {
                                        // New comment; suppress conflict.
                                        $this->isConflict = false;
                                        wfDebug( "EditPage::editForm conflict suppressed; new section\n" );
                                }
                        }
                }
                $userid = $wgUser->getID();

                if ( $this->isConflict) {
                        wfDebug( "EditPage::editForm conflict! getting section '$this->section' for time '$this->edittime' (article time '" .
                                $this->mArticle->getTimestamp() . "')\n" );
                        $text = $this->mArticle->replaceSection( $this->section, $this->textbox1, $this->summary, $this->edittime);
                }
                else {
                        wfDebug( "EditPage::editForm getting section '$this->section'\n" );
                        $text = $this->mArticle->replaceSection( $this->section, $this->textbox1, $this->summary);
                }
                if( is_null( $text ) ) {
                        wfDebug( "EditPage::editForm activating conflict; section replace failed.\n" );
                        $this->isConflict = true;
                        $text = $this->textbox1;
                }

                # Suppress edit conflict with self, except for section edits where merging is required.
                if ( ( $this->section == '' ) && ( 0 != $userid ) && ( $this->mArticle->getUser() == $userid ) ) {
                        wfDebug( "EditPage::editForm Suppressing edit conflict, same user.\n" );
                        $this->isConflict = false;
                } else {
                        # switch from section editing to normal editing in edit conflict
                        if($this->isConflict) {
                                # Attempt merge
                                if( $this->mergeChangesInto( $text ) ){
                                        // Successful merge! Maybe we should tell the user the good news?
                                        $this->isConflict = false;
                                        wfDebug( "EditPage::editForm Suppressing edit conflict, successful merge.\n" );
                                } else {
                                        $this->section = '';
                                        $this->textbox1 = $text;
                                        wfDebug( "EditPage::editForm Keeping edit conflict, failed merge.\n" );
                                }
                        }
                }

                if ( $this->isConflict ) {
                        wfProfileOut( $fname );
                        return self::AS_CONFLICT_DETECTED;
                }

                $oldtext = $this->mArticle->getContent();

                // Run post-section-merge edit filter
                if ( !wfRunHooks( 'EditFilterMerged', array( $this, $text, &$this->hookError ) ) ) {
                        # Error messages etc. could be handled within the hook...
                        wfProfileOut( $fname );
                        return false;
                }

                # Handle the user preference to force summaries here, but not for null edits
                if( $this->section != 'new' && !$this->allowBlankSummary && $wgUser->getOption( 'forceeditsummary')
                        &&  0 != strcmp($oldtext, $text) && !Article::getRedirectAutosummary( $text )) {
                        if( md5( $this->summary ) == $this->autoSumm ) {
                                $this->missingSummary = true;
                                wfProfileOut( $fname );
                                return self::AS_SUMMARY_NEEDED;
                        }
                }

                #And a similar thing for new sections
                if( $this->section == 'new' && !$this->allowBlankSummary && $wgUser->getOption( 'forceeditsummary' ) ) {
                        if (trim($this->summary) == '') {
                                $this->missingSummary = true;
                                wfProfileOut( $fname );
                                return self::AS_SUMMARY_NEEDED;
                        }
                }

                # All's well
                wfProfileIn( "$fname-sectionanchor" );
                $sectionanchor = '';
                if( $this->section == 'new' ) {
                        if ( $this->textbox1 == '' ) {
                                $this->missingComment = true;
                                return self::AS_TEXTBOX_EMPTY;
                        }
                        if( $this->summary != '' ) {
                                $sectionanchor = $wgParser->guessSectionNameFromWikiText( $this->summary );
                                # This is a new section, so create a link to the new section
                                # in the revision summary.
                                $cleanSummary = $wgParser->stripSectionName( $this->summary );
                                $this->summary = wfMsgForContent( 'newsectionsummary', $cleanSummary );
                        }
                } elseif( $this->section != '' ) {
                        # Try to get a section anchor from the section source, redirect to edited section if header found
                        # XXX: might be better to integrate this into Article::replaceSection
                        # for duplicate heading checking and maybe parsing
                        $hasmatch = preg_match( "/^ *([=]{1,6})(.*?)(\\1) *\\n/i", $this->textbox1, $matches );
                        # we can't deal with anchors, includes, html etc in the header for now,
                        # headline would need to be parsed to improve this
                        if($hasmatch and strlen($matches[2]) > 0) {
                                $sectionanchor = $wgParser->guessSectionNameFromWikiText( $matches[2] );
                        }
                }
                wfProfileOut( "$fname-sectionanchor" );

                // Save errors may fall down to the edit form, but we've now
                // merged the section into full text. Clear the section field
                // so that later submission of conflict forms won't try to
                // replace that into a duplicated mess.
                $this->textbox1 = $text;
                $this->section = '';

                // Check for length errors again now that the section is merged in
                $this->kblength = (int)(strlen( $text ) / 1024);
                if ( $this->kblength > $wgMaxArticleSize ) {
                        $this->tooBig = true;
                        wfProfileOut( $fname );
                        return self::AS_MAX_ARTICLE_SIZE_EXCEDED;
                }

                # update the article here
                if( $this->mArticle->updateArticle( $text, $this->summary, $this->minoredit,
                        $this->watchthis, '', $sectionanchor ) ) {
                        wfProfileOut( $fname );
                        return self::AS_SUCCESS_UPDATE;
                } else {
                        $this->isConflict = true;
                }
                wfProfileOut( $fname );
                return self::AS_END;
        }

        /**
         * Initialise form fields in the object
         * Called on the first invocation, e.g. when a user clicks an edit link
         */
        function initialiseForm() {
                $this->edittime = $this->mArticle->getTimestamp();
                $this->summary = '';
                $this->textbox1 = $this->getContent(false);
                if ($this->textbox1 === false) return false;

                if ( !$this->mArticle->exists() && $this->mTitle->getNamespace() == NS_MEDIAWIKI )
                        $this->textbox1 = wfMsgWeirdKey( $this->mTitle->getText() );
                wfProxyCheck();
                return true;
        }

        /**
         * Send the edit form and related headers to $wgOut
         * @param $formCallback Optional callable that takes an OutputPage
         *                      parameter; will be called during form output
         *                      near the top, for captchas and the like.
         */
        function showEditForm( $formCallback=null ) {
                global $wgOut, $wgUser, $wgLang, $wgContLang, $wgMaxArticleSize, $wgTitle;

                $fname = 'EditPage::showEditForm';
                wfProfileIn( $fname );

                $sk = $wgUser->getSkin();

                wfRunHooks( 'EditPage::showEditForm:initial', array( &$this ) ) ;

                $wgOut->setRobotpolicy( 'noindex,nofollow' );

                # Enabled article-related sidebar, toplinks, etc.
                $wgOut->setArticleRelated( true );

                if ( $this->formtype == 'preview' ) {
                        $wgOut->setPageTitleActionText( wfMsg( 'preview' ) );
                }

                if ( $this->isConflict ) {
                        $s = wfMsg( 'editconflict', $wgTitle->getPrefixedText() );
                        $wgOut->setPageTitle( $s );
                        $wgOut->addWikiText( wfMsg( 'explainconflict' ) );

                        $this->textbox2 = $this->textbox1;
                        $this->textbox1 = $this->getContent();
                        $this->edittime = $this->mArticle->getTimestamp();
                } else {

                        if( $this->section != '' ) {
                                if( $this->section == 'new' ) {
                                        $s = wfMsg('editingcomment', $wgTitle->getPrefixedText() );
                                } else {
                                        $s = wfMsg('editingsection', $wgTitle->getPrefixedText() );
                                        $matches = array();
                                        if( !$this->summary && !$this->preview && !$this->diff ) {
                                                preg_match( "/^(=+)(.+)\\1/mi",
                                                        $this->textbox1,
                                                        $matches );
                                                if( !empty( $matches[2] ) ) {
                                                        global $wgParser;
                                                        $this->summary = "/* " . 
                                                                $wgParser->stripSectionName(trim($matches[2])) . 
                                                                " */ ";
                                                }
                                        }
                                }
                        } else {
                                $s = wfMsg( 'editing', $wgTitle->getPrefixedText() );
                        }
                        $wgOut->setPageTitle( $s );

                        if ( $this->missingComment ) {
                                $wgOut->addWikiText( '<div id="mw-missingcommenttext">' . wfMsg( 'missingcommenttext' ) . '</div>' );
                        }

                        if( $this->missingSummary && $this->section != 'new' ) {
                                $wgOut->addWikiText( '<div id="mw-missingsummary">' . wfMsg( 'missingsummary' ) . '</div>' );
                        }

                        if( $this->missingSummary && $this->section == 'new' ) {
                                $wgOut->addWikiText( '<div id="mw-missingcommentheader">' . wfMsg( 'missingcommentheader' ) . '</div>' );
                        }

                        if( !$this->hookError == '' ) {
                                $wgOut->addWikiText( $this->hookError );
                        }

                        if ( !$this->checkUnicodeCompliantBrowser() ) {
                                $wgOut->addWikiText( wfMsg( 'nonunicodebrowser') );
                        }
                        if ( isset( $this->mArticle ) && isset( $this->mArticle->mRevision ) ) {
                        // Let sysop know that this will make private content public if saved
                                
                                if( !$this->mArticle->mRevision->userCan( Revision::DELETED_TEXT ) ) {
                                        $wgOut->addWikiText( wfMsg( 'rev-deleted-text-permission' ) );
                                } else if( $this->mArticle->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
                                        $wgOut->addWikiText( wfMsg( 'rev-deleted-text-view' ) );
                                }
                                
                                if( !$this->mArticle->mRevision->isCurrent() ) {
                                        $this->mArticle->setOldSubtitle( $this->mArticle->mRevision->getId() );
                                        $wgOut->addWikiText( wfMsg( 'editingold' ) );
                                }
                        }
                }

                if( wfReadOnly() ) {
                        $wgOut->addWikiText( wfMsg( 'readonlywarning' ) );
                } elseif( $wgUser->isAnon() && $this->formtype != 'preview' ) {
                        $wgOut->addWikiText( wfMsg( 'anoneditwarning' ) );
                } else {
                        if( $this->isCssJsSubpage && $this->formtype != 'preview' ) {
                                # Check the skin exists
                                if( $this->isValidCssJsSubpage ) {
                                        $wgOut->addWikiText( wfMsg( 'usercssjsyoucanpreview' ) );
                                } else {
                                        $wgOut->addWikiText( wfMsg( 'userinvalidcssjstitle', $wgTitle->getSkinFromCssJsSubpage() ) );
                                }
                        }
                }

                if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
                        # Show a warning if editing an interface message
                        $wgOut->addWikiText( wfMsg( 'editinginterface' ) );
                } elseif( $this->mTitle->isProtected( 'edit' ) ) {
                        # Is the title semi-protected?
                        if( $this->mTitle->isSemiProtected() ) {
                                $notice = wfMsg( 'semiprotectedpagewarning' );
                                if( wfEmptyMsg( 'semiprotectedpagewarning', $notice ) || $notice == '-' )
                                        $notice = '';
                        } else {
                        # Then it must be protected based on static groups (regular)
                                $notice = wfMsg( 'protectedpagewarning' );
                        }
                        $wgOut->addWikiText( $notice );
                }
                if ( $this->mTitle->isCascadeProtected() ) {
                        # Is this page under cascading protection from some source pages?
                        list($cascadeSources, /* $restrictions */) = $this->mTitle->getCascadeProtectionSources();
                        if ( count($cascadeSources) > 0 ) {
                                # Explain, and list the titles responsible
                                $notice = wfMsgExt( 'cascadeprotectedwarning', array('parsemag'), count($cascadeSources) ) . "\n";
                                foreach( $cascadeSources as $page ) {
                                        $notice .= '* [[:' . $page->getPrefixedText() . "]]\n";
                                }
                        }
                        $wgOut->addWikiText( $notice );
                }

                if ( $this->kblength === false ) {
                        $this->kblength = (int)(strlen( $this->textbox1 ) / 1024);
                }
                if ( $this->tooBig || $this->kblength > $wgMaxArticleSize ) {
                        $wgOut->addWikiText( wfMsg( 'longpageerror', $wgLang->formatNum( $this->kblength ), $wgMaxArticleSize ) );
                } elseif( $this->kblength > 29 ) {
                        $wgOut->addWikiText( wfMsg( 'longpagewarning', $wgLang->formatNum( $this->kblength ) ) );
                }

                #need to parse the preview early so that we know which templates are used,
                #otherwise users with "show preview after edit box" will get a blank list
                if ( $this->formtype == 'preview' ) {
                        $previewOutput = $this->getPreviewText();
                }

                $rows = $wgUser->getIntOption( 'rows' );
                $cols = $wgUser->getIntOption( 'cols' );

                $ew = $wgUser->getOption( 'editwidth' );
                if ( $ew ) $ew = " style=\"width:100%\"";
                else $ew = '';

                $q = 'action=submit';
                #if ( "no" == $redirect ) { $q .= "&redirect=no"; }
                $action = $wgTitle->escapeLocalURL( $q );

                $summary = wfMsg('summary');
                $subject = wfMsg('subject');

                $cancel = $sk->makeKnownLink( $wgTitle->getPrefixedText(),
                                wfMsgExt('cancel', array('parseinline')) );
                $edithelpurl = Skin::makeInternalOrExternalUrl( wfMsgForContent( 'edithelppage' ));
                $edithelp = '<a target="helpwindow" href="'.$edithelpurl.'">'.
                        htmlspecialchars( wfMsg( 'edithelp' ) ).'</a> '.
                        htmlspecialchars( wfMsg( 'newwindow' ) );

                global $wgRightsText;
                $copywarn = "<div id=\"editpage-copywarn\">\n" .
                        wfMsg( $wgRightsText ? 'copyrightwarning' : 'copyrightwarning2',
                                '[[' . wfMsgForContent( 'copyrightpage' ) . ']]',
                                $wgRightsText ) . "\n</div>";

                if( $wgUser->getOption('showtoolbar') and !$this->isCssJsSubpage ) {
                        # prepare toolbar for edit buttons
                        $toolbar = $this->getEditToolbar();
                } else {
                        $toolbar = '';
                }

                // activate checkboxes if user wants them to be always active
                if( !$this->preview && !$this->diff ) {
                        # Sort out the "watch" checkbox
                        if( $wgUser->getOption( 'watchdefault' ) ) {
                                # Watch all edits
                                $this->watchthis = true;
                        } elseif( $wgUser->getOption( 'watchcreations' ) && !$this->mTitle->exists() ) {
                                # Watch creations
                                $this->watchthis = true;
                        } elseif( $this->mTitle->userIsWatching() ) {
                                # Already watched
                                $this->watchthis = true;
                        }

                        if( $wgUser->getOption( 'minordefault' ) ) $this->minoredit = true;
                }

                $wgOut->addHTML( $this->editFormPageTop );

                if ( $wgUser->getOption( 'previewontop' ) ) {

                        if ( 'preview' == $this->formtype ) {
                                $this->showPreview( $previewOutput );
                        } else {
                                $wgOut->addHTML( '<div id="wikiPreview"></div>' );
                        }

                        if ( 'diff' == $this->formtype ) {
                                $this->showDiff();
                        }
                }


                $wgOut->addHTML( $this->editFormTextTop );

                # if this is a comment, show a subject line at the top, which is also the edit summary.
                # Otherwise, show a summary field at the bottom
                $summarytext = htmlspecialchars( $wgContLang->recodeForEdit( $this->summary ) ); # FIXME
                if( $this->section == 'new' ) {
                        $commentsubject="<span id='wpSummaryLabel'><label for='wpSummary'>{$subject}:</label></span>\n<div class='editOptions'>\n<input tabindex='1' type='text' value=\"$summarytext\" name='wpSummary' id='wpSummary' maxlength='200' size='60' /><br />";
                        $editsummary = '';
                        $subjectpreview = $summarytext && $this->preview ? "<div class=\"mw-summary-preview\">".wfMsg('subject-preview').':'.$sk->commentBlock( $this->summary, $this->mTitle )."</div>\n" : '';
                        $summarypreview = '';
                } else {
                        $commentsubject = '';
                        $editsummary="<span id='wpSummaryLabel'><label for='wpSummary'>{$summary}:</label></span>\n<div class='editOptions'>\n<input tabindex='2' type='text' value=\"$summarytext\" name='wpSummary' id='wpSummary' maxlength='200' size='60' /><br />";
                        $summarypreview = $summarytext && $this->preview ? "<div class=\"mw-summary-preview\">".wfMsg('summary-preview').':'.$sk->commentBlock( $this->summary, $this->mTitle )."</div>\n" : '';
                        $subjectpreview = '';
                }

                # Set focus to the edit box on load, except on preview or diff, where it would interfere with the display
                if( !$this->preview && !$this->diff ) {
                        $wgOut->setOnloadHandler( 'document.editform.wpTextbox1.focus()' );
                }
                $templates = ($this->preview || $this->section != '') ? $this->mPreviewTemplates : $this->mArticle->getUsedTemplates();
                $formattedtemplates = $sk->formatTemplates( $templates, $this->preview, $this->section != '');

                global $wgUseMetadataEdit ;
                if ( $wgUseMetadataEdit ) {
                        $metadata = $this->mMetaData ;
                        $metadata = htmlspecialchars( $wgContLang->recodeForEdit( $metadata ) ) ;
                        $top = wfMsgWikiHtml( 'metadata_help' );
                        $metadata = $top . "<textarea name='metadata' rows='3' cols='{$cols}'{$ew}>{$metadata}</textarea>" ;
                }
                else $metadata = "" ;

                $hidden = '';
                $recreate = '';
                if ($this->deletedSinceEdit) {
                        if ( 'save' != $this->formtype ) {
                                $wgOut->addWikiText( wfMsg('deletedwhileediting'));
                        } else {
                                // Hide the toolbar and edit area, use can click preview to get it back
                                // Add an confirmation checkbox and explanation.
                                $toolbar = '';
                                $hidden = 'type="hidden" style="display:none;"';
                                $recreate = $wgOut->parse( wfMsg( 'confirmrecreate',  $this->lastDelete->user_name , $this->lastDelete->log_comment ));
                                $recreate .=
                                        "<br /><input tabindex='1' type='checkbox' value='1' name='wpRecreate' id='wpRecreate' />".
                                        "<label for='wpRecreate' title='".wfMsg('tooltip-recreate')."'>". wfMsg('recreate')."</label>";
                        }
                }

                $tabindex = 2;

                $checkboxes = self::getCheckboxes( $tabindex, $sk,
                        array( 'minor' => $this->minoredit, 'watch' => $this->watchthis ) );

                $checkboxhtml = implode( $checkboxes, "\n" );

                $buttons = $this->getEditButtons( $tabindex );
                $buttonshtml = implode( $buttons, "\n" );

                $safemodehtml = $this->checkUnicodeCompliantBrowser()
                        ? '' : Xml::hidden( 'safemode', '1' );

                $wgOut->addHTML( <<<END
{$toolbar}
<form id="editform" name="editform" method="post" action="$action" enctype="multipart/form-data">
END
);

                if( is_callable( $formCallback ) ) {
                        call_user_func_array( $formCallback, array( &$wgOut ) );
                }

                wfRunHooks( 'EditPage::showEditForm:fields', array( &$this, &$wgOut ) );

                // Put these up at the top to ensure they aren't lost on early form submission
                $wgOut->addHTML( "
<input type='hidden' value=\"" . htmlspecialchars( $this->section ) . "\" name=\"wpSection\" />
<input type='hidden' value=\"{$this->starttime}\" name=\"wpStarttime\" />\n
<input type='hidden' value=\"{$this->edittime}\" name=\"wpEdittime\" />\n
<input type='hidden' value=\"{$this->scrolltop}\" name=\"wpScrolltop\" id=\"wpScrolltop\" />\n" );

                $wgOut->addHTML( <<<END
$recreate
{$commentsubject}
{$subjectpreview}
{$this->editFormTextBeforeContent}
<textarea tabindex='1' accesskey="," name="wpTextbox1" id="wpTextbox1" rows='{$rows}'
cols='{$cols}'{$ew} $hidden>
END
. htmlspecialchars( $this->safeUnicodeOutput( $this->textbox1 ) ) .
"
</textarea>
                " );

                $wgOut->addWikiText( $copywarn );
                $wgOut->addHTML( $this->editFormTextAfterWarn );
                $wgOut->addHTML( "
{$metadata}
{$editsummary}
{$summarypreview}
{$checkboxhtml}
{$safemodehtml}
");

                $wgOut->addHTML(
"<div class='editButtons'>
{$buttonshtml}
        <span class='editHelp'>{$cancel} | {$edithelp}</span>
</div><!-- editButtons -->
</div><!-- editOptions -->");

                $wgOut->addHtml( '<div class="mw-editTools">' );
                $wgOut->addWikiText( wfMsgForContent( 'edittools' ) );
                $wgOut->addHtml( '</div>' );

                $wgOut->addHTML( $this->editFormTextAfterTools );

                $wgOut->addHTML( "
<div class='templatesUsed'>
{$formattedtemplates}
</div>
" );

                /**
                 * To make it harder for someone to slip a user a page
                 * which submits an edit form to the wiki without their
                 * knowledge, a random token is associated with the login
                 * session. If it's not passed back with the submission,
                 * we won't save the page, or render user JavaScript and
                 * CSS previews.
                 *
                 * For anon editors, who may not have a session, we just
                 * include the constant suffix to prevent editing from
                 * broken text-mangling proxies.
                 */
                $token = htmlspecialchars( $wgUser->editToken() );
                $wgOut->addHTML( "\n<input type='hidden' value=\"$token\" name=\"wpEditToken\" />\n" );


                # If a blank edit summary was previously provided, and the appropriate
                # user preference is active, pass a hidden tag here. This will stop the
                # user being bounced back more than once in the event that a summary
                # is not required.
                if( $this->missingSummary ) {
                        $wgOut->addHTML( "<input type=\"hidden\" name=\"wpIgnoreBlankSummary\" value=\"1\" />\n" );
                }

                # For a bit more sophisticated detection of blank summaries, hash the
                # automatic one and pass that in a hidden field.
                $autosumm = $this->autoSumm ? $this->autoSumm : md5( $this->summary );
                $wgOut->addHtml( wfHidden( 'wpAutoSummary', $autosumm ) );

                if ( $this->isConflict ) {
                        $wgOut->addWikiText( '==' . wfMsg( "yourdiff" ) . '==' );

                        $de = new DifferenceEngine( $this->mTitle );
                        $de->setText( $this->textbox2, $this->textbox1 );
                        $de->showDiff( wfMsg( "yourtext" ), wfMsg( "storedversion" ) );

                        $wgOut->addWikiText( '==' . wfMsg( "yourtext" ) . '==' );
                        $wgOut->addHTML( "<textarea tabindex=6 id='wpTextbox2' name=\"wpTextbox2\" rows='{$rows}' cols='{$cols}' wrap='virtual'>"
                                . htmlspecialchars( $this->safeUnicodeOutput( $this->textbox2 ) ) . "\n</textarea>" );
                }
                $wgOut->addHTML( $this->editFormTextBottom );
                $wgOut->addHTML( "</form>\n" );
                if ( !$wgUser->getOption( 'previewontop' ) ) {

                        if ( $this->formtype == 'preview') {
                                $this->showPreview( $previewOutput );
                        } else {
                                $wgOut->addHTML( '<div id="wikiPreview"></div>' );
                        }

                        if ( $this->formtype == 'diff') {
                                $this->showDiff();
                        }

                }

                wfProfileOut( $fname );
        }

        /**
         * Append preview output to $wgOut.
         * Includes category rendering if this is a category page.
         *
         * @param string $text The HTML to be output for the preview.
         */
        private function showPreview( $text ) {
                global $wgOut;

                $wgOut->addHTML( '<div id="wikiPreview">' );
                if($this->mTitle->getNamespace() == NS_CATEGORY) {
                        $this->mArticle->openShowCategory();
                }
                wfRunHooks( 'OutputPageBeforeHTML',array( &$wgOut, &$text ) );
                $wgOut->addHTML( $text );
                if($this->mTitle->getNamespace() == NS_CATEGORY) {
                        $this->mArticle->closeShowCategory();
                }
                $wgOut->addHTML( '</div>' );
        }

        /**
         * Live Preview lets us fetch rendered preview page content and
         * add it to the page without refreshing the whole page.
         * If not supported by the browser it will fall through to the normal form
         * submission method.
         *
         * This function outputs a script tag to support live preview, and
         * returns an onclick handler which should be added to the attributes
         * of the preview button
         */
        function doLivePreviewScript() {
                global $wgStylePath, $wgJsMimeType, $wgStyleVersion, $wgOut, $wgTitle;
                $wgOut->addHTML( '<script type="'.$wgJsMimeType.'" src="' .
                        htmlspecialchars( "$wgStylePath/common/preview.js?$wgStyleVersion" ) .
                        '"></script>' . "\n" );
                $liveAction = $wgTitle->getLocalUrl( 'action=submit&wpPreview=true&live=true' );
                return "return !lpDoPreview(" .
                        "editform.wpTextbox1.value," .
                        '"' . $liveAction . '"' . ")";
        }

        function getLastDelete() {
                $dbr = wfGetDB( DB_SLAVE );
                $fname = 'EditPage::getLastDelete';
                $res = $dbr->select(
                        array( 'logging', 'user' ),
                        array( 'log_type',
                               'log_action',
                               'log_timestamp',
                               'log_user',
                               'log_namespace',
                               'log_title',
                               'log_comment',
                               'log_params',
                               'user_name', ),
                        array( 'log_namespace' => $this->mTitle->getNamespace(),
                               'log_title' => $this->mTitle->getDBkey(),
                               'log_type' => 'delete',
                               'log_action' => 'delete',
                               'user_id=log_user' ),
                        $fname,
                        array( 'LIMIT' => 1, 'ORDER BY' => 'log_timestamp DESC' ) );

                if($dbr->numRows($res) == 1) {
                        while ( $x = $dbr->fetchObject ( $res ) )
                                $data = $x;
                        $dbr->freeResult ( $res ) ;
                } else {
                        $data = null;
                }
                return $data;
        }

        /**
         * @todo document
         */
        function getPreviewText() {
                global $wgOut, $wgUser, $wgTitle, $wgParser;

                $fname = 'EditPage::getPreviewText';
                wfProfileIn( $fname );

                if ( $this->mTriedSave && !$this->mTokenOk ) {
                        if ( $this->mTokenOkExceptSuffix ) {
                                $note = wfMsg( 'token_suffix_mismatch' );
                        } else {
                                $note = wfMsg( 'session_fail_preview' );
                        }
                } else {
                        $note = wfMsg( 'previewnote' );
                }

                $parserOptions = ParserOptions::newFromUser( $wgUser );
                $parserOptions->setEditSection( false );

                global $wgRawHtml;
                if( $wgRawHtml && !$this->mTokenOk ) {
                        // Could be an offsite preview attempt. This is very unsafe if
                        // HTML is enabled, as it could be an attack.
                        return $wgOut->parse( "<div class='previewnote'>" .
                                wfMsg( 'session_fail_preview_html' ) . "</div>" );
                }

                # don't parse user css/js, show message about preview
                # XXX: stupid php bug won't let us use $wgTitle->isCssJsSubpage() here

                if ( $this->isCssJsSubpage ) {
                        if(preg_match("/\\.css$/", $this->mTitle->getText() ) ) {
                                $previewtext = wfMsg('usercsspreview');
                        } else if(preg_match("/\\.js$/", $this->mTitle->getText() ) ) {
                                $previewtext = wfMsg('userjspreview');
                        }
                        $parserOptions->setTidy(true);
                        $parserOutput = $wgParser->parse( $previewtext , $this->mTitle, $parserOptions );
                        $wgOut->addHTML( $parserOutput->mText );
                        $previewHTML = '';
                } else {
                        $toparse = $this->textbox1;

                        # If we're adding a comment, we need to show the
                        # summary as the headline
                        if($this->section=="new" && $this->summary!="") {
                                $toparse="== {$this->summary} ==\n\n".$toparse;
                        }

                        if ( $this->mMetaData != "" ) $toparse .= "\n" . $this->mMetaData ;
                        $parserOptions->setTidy(true);
                        $parserOptions->enableLimitReport();
                        $parserOutput = $wgParser->parse( $this->mArticle->preSaveTransform( $toparse ) ."\n\n",
                                        $this->mTitle, $parserOptions );

                        $previewHTML = $parserOutput->getText();
                        $wgOut->addParserOutputNoText( $parserOutput );
                        
                        # ParserOutput might have altered the page title, so reset it
                        $wgOut->setPageTitle( wfMsg( 'editing', $wgTitle->getPrefixedText() ) );                        

                        foreach ( $parserOutput->getTemplates() as $ns => $template)
                                foreach ( array_keys( $template ) as $dbk)
                                        $this->mPreviewTemplates[] = Title::makeTitle($ns, $dbk);

                        if ( count( $parserOutput->getWarnings() ) ) {
                                $note .= "\n\n" . implode( "\n\n", $parserOutput->getWarnings() );
                        }
                }

                $previewhead = '<h2>' . htmlspecialchars( wfMsg( 'preview' ) ) . "</h2>\n" .
                        "<div class='previewnote'>" . $wgOut->parse( $note ) . "</div>\n";
                if ( $this->isConflict ) {
                        $previewhead.='<h2>' . htmlspecialchars( wfMsg( 'previewconflict' ) ) . "</h2>\n";
                }

                wfProfileOut( $fname );
                return $previewhead . $previewHTML;
        }

        /**
         * Call the stock "user is blocked" page
         */
        function blockedPage() {
                global $wgOut, $wgUser;
                $wgOut->blockedPage( false ); # Standard block notice on the top, don't 'return'

                # If the user made changes, preserve them when showing the markup
                # (This happens when a user is blocked during edit, for instance)
                $first = $this->firsttime || ( !$this->save && $this->textbox1 == '' );
                if( $first ) {
                        $source = $this->mTitle->exists() ? $this->getContent() : false;
                } else {
                        $source = $this->textbox1;
                }

                # Spit out the source or the user's modified version
                if( $source !== false ) {
                        $rows = $wgUser->getOption( 'rows' );
                        $cols = $wgUser->getOption( 'cols' );
                        $attribs = array( 'id' => 'wpTextbox1', 'name' => 'wpTextbox1', 'cols' => $cols, 'rows' => $rows, 'readonly' => 'readonly' );
                        $wgOut->addHtml( '<hr />' );
                        $wgOut->addWikiText( wfMsg( $first ? 'blockedoriginalsource' : 'blockededitsource', $this->mTitle->getPrefixedText() ) );
                        $wgOut->addHtml( wfOpenElement( 'textarea', $attribs ) . htmlspecialchars( $source ) . wfCloseElement( 'textarea' ) );
                }
        }

        /**
         * Produce the stock "please login to edit pages" page
         */
        function userNotLoggedInPage() {
                global $wgUser, $wgOut, $wgTitle;
                $skin = $wgUser->getSkin();

                $loginTitle = SpecialPage::getTitleFor( 'Userlogin' );
                $loginLink = $skin->makeKnownLinkObj( $loginTitle, wfMsgHtml( 'loginreqlink' ), 'returnto=' . $wgTitle->getPrefixedUrl() );

                $wgOut->setPageTitle( wfMsg( 'whitelistedittitle' ) );
                $wgOut->setRobotPolicy( 'noindex,nofollow' );
                $wgOut->setArticleRelated( false );

                $wgOut->addHtml( wfMsgWikiHtml( 'whitelistedittext', $loginLink ) );
                $wgOut->returnToMain( false, $wgTitle );
        }

        /**
         * Creates a basic error page which informs the user that
         * they have attempted to edit a nonexistant section.
         */
        function noSuchSectionPage() {
                global $wgOut, $wgTitle;

                $wgOut->setPageTitle( wfMsg( 'nosuchsectiontitle' ) );
                $wgOut->setRobotPolicy( 'noindex,nofollow' );
                $wgOut->setArticleRelated( false );

                $wgOut->addWikiText( wfMsg( 'nosuchsectiontext', $this->section ) );
                $wgOut->returnToMain( false, $wgTitle );
        }

        /**
         * Produce the stock "your edit contains spam" page
         *
         * @param $match Text which triggered one or more filters
         */
        function spamPage( $match = false ) {
                global $wgOut, $wgTitle;

                $wgOut->setPageTitle( wfMsg( 'spamprotectiontitle' ) );
                $wgOut->setRobotPolicy( 'noindex,nofollow' );
                $wgOut->setArticleRelated( false );

                $wgOut->addWikiText( wfMsg( 'spamprotectiontext' ) );
                if ( $match )
                        $wgOut->addWikiText( wfMsg( 'spamprotectionmatch', "<nowiki>{$match}</nowiki>" ) );

                $wgOut->returnToMain( false, $wgTitle );
        }

        /**
         * @private
         * @todo document
         */
        function mergeChangesInto( &$editText ){
                $fname = 'EditPage::mergeChangesInto';
                wfProfileIn( $fname );

                $db = wfGetDB( DB_MASTER );

                // This is the revision the editor started from
                $baseRevision = Revision::loadFromTimestamp(
                        $db, $this->mTitle, $this->edittime );
                if( is_null( $baseRevision ) ) {
                        wfProfileOut( $fname );
                        return false;
                }
                $baseText = $baseRevision->getText();

                // The current state, we want to merge updates into it
                $currentRevision =  Revision::loadFromTitle(
                        $db, $this->mTitle );
                if( is_null( $currentRevision ) ) {
                        wfProfileOut( $fname );
                        return false;
                }
                $currentText = $currentRevision->getText();

                $result = '';
                if( wfMerge( $baseText, $editText, $currentText, $result ) ){
                        $editText = $result;
                        wfProfileOut( $fname );
                        return true;
                } else {
                        wfProfileOut( $fname );
                        return false;
                }
        }

        /**
         * Check if the browser is on a blacklist of user-agents known to
         * mangle UTF-8 data on form submission. Returns true if Unicode
         * should make it through, false if it's known to be a problem.
         * @return bool
         * @private
         */
        function checkUnicodeCompliantBrowser() {
                global $wgBrowserBlackList;
                if( empty( $_SERVER["HTTP_USER_AGENT"] ) ) {
                        // No User-Agent header sent? Trust it by default...
                        return true;
                }
                $currentbrowser = $_SERVER["HTTP_USER_AGENT"];
                foreach ( $wgBrowserBlackList as $browser ) {
                        if ( preg_match($browser, $currentbrowser) ) {
                                return false;
                        }
                }
                return true;
        }

        /**
         * @deprecated use $wgParser->stripSectionName()
         */
        function pseudoParseSectionAnchor( $text ) {
                global $wgParser;
                return $wgParser->stripSectionName( $text );
        }

        /**
         * Format an anchor fragment as it would appear for a given section name
         * @param string $text
         * @return string
         * @private
         */
        function sectionAnchor( $text ) {
                global $wgParser;
                return $wgParser->guessSectionNameFromWikiText( $text );
        }

        /**
         * Shows a bulletin board style toolbar for common editing functions.
         * It can be disabled in the user preferences.
         * The necessary JavaScript code can be found in style/wikibits.js.
         */
        function getEditToolbar() {
                global $wgStylePath, $wgContLang, $wgJsMimeType;

                /**
                 * toolarray an array of arrays which each include the filename of
                 * the button image (without path), the opening tag, the closing tag,
                 * and optionally a sample text that is inserted between the two when no
                 * selection is highlighted.
                 * The tip text is shown when the user moves the mouse over the button.
                 *
                 * Already here are accesskeys (key), which are not used yet until someone
                 * can figure out a way to make them work in IE. However, we should make
                 * sure these keys are not defined on the edit page.
                 */
                $toolarray = array(
                        array(  'image' => 'button_bold.png',
                                'id'    => 'mw-editbutton-bold',
                                'open'  => '\\\'\\\'\\\'',
                                'close' => '\\\'\\\'\\\'',
                                'sample'=> wfMsg('bold_sample'),
                                'tip'   => wfMsg('bold_tip'),
                                'key'   => 'B'
                        ),
                        array(  'image' => 'button_italic.png',
                                'id'    => 'mw-editbutton-italic',
                                'open'  => '\\\'\\\'',
                                'close' => '\\\'\\\'',
                                'sample'=> wfMsg('italic_sample'),
                                'tip'   => wfMsg('italic_tip'),
                                'key'   => 'I'
                        ),
                        array(  'image' => 'button_link.png',
                                'id'    => 'mw-editbutton-link',
                                'open'  => '[[',
                                'close' => ']]',
                                'sample'=> wfMsg('link_sample'),
                                'tip'   => wfMsg('link_tip'),
                                'key'   => 'L'
                        ),
                        array(  'image' => 'button_extlink.png',
                                'id'    => 'mw-editbutton-extlink',
                                'open'  => '[',
                                'close' => ']',
                                'sample'=> wfMsg('extlink_sample'),
                                'tip'   => wfMsg('extlink_tip'),
                                'key'   => 'X'
                        ),
                        array(  'image' => 'button_headline.png',
                                'id'    => 'mw-editbutton-headline',
                                'open'  => "\\n== ",
                                'close' => " ==\\n",
                                'sample'=> wfMsg('headline_sample'),
                                'tip'   => wfMsg('headline_tip'),
                                'key'   => 'H'
                        ),
                        array(  'image' => 'button_image.png',
                                'id'    => 'mw-editbutton-image',
                                'open'  => '[['.$wgContLang->getNsText(NS_IMAGE).":",
                                'close' => ']]',
                                'sample'=> wfMsg('image_sample'),
                                'tip'   => wfMsg('image_tip'),
                                'key'   => 'D'
                        ),
                        array(  'image' => 'button_media.png',
                                'id'    => 'mw-editbutton-media',
                                'open'  => '[['.$wgContLang->getNsText(NS_MEDIA).':',
                                'close' => ']]',
                                'sample'=> wfMsg('media_sample'),
                                'tip'   => wfMsg('media_tip'),
                                'key'   => 'M'
                        ),
                        array(  'image' => 'button_math.png',
                                'id'    => 'mw-editbutton-math',
                                'open'  => "<math>",
                                'close' => "<\\/math>",
                                'sample'=> wfMsg('math_sample'),
                                'tip'   => wfMsg('math_tip'),
                                'key'   => 'C'
                        ),
                        array(  'image' => 'button_nowiki.png',
                                'id'    => 'mw-editbutton-nowiki',
                                'open'  => "<nowiki>",
                                'close' => "<\\/nowiki>",
                                'sample'=> wfMsg('nowiki_sample'),
                                'tip'   => wfMsg('nowiki_tip'),
                                'key'   => 'N'
                        ),
                        array(  'image' => 'button_sig.png',
                                'id'    => 'mw-editbutton-signature',
                                'open'  => '--~~~~',
                                'close' => '',
                                'sample'=> '',
                                'tip'   => wfMsg('sig_tip'),
                                'key'   => 'Y'
                        ),
                        array(  'image' => 'button_hr.png',
                                'id'    => 'mw-editbutton-hr',
                                'open'  => "\\n----\\n",
                                'close' => '',
                                'sample'=> '',
                                'tip'   => wfMsg('hr_tip'),
                                'key'   => 'R'
                        )
                );
                $toolbar = "<div id='toolbar'>\n";
                $toolbar.="<script type='$wgJsMimeType'>\n/*<![CDATA[*/\n";

                foreach($toolarray as $tool) {

                        $cssId = $tool['id'];
                        $image=$wgStylePath.'/common/images/'.$tool['image'];
                        $open=$tool['open'];
                        $close=$tool['close'];
                        $sample = wfEscapeJsString( $tool['sample'] );

                        // Note that we use the tip both for the ALT tag and the TITLE tag of the image.
                        // Older browsers show a "speedtip" type message only for ALT.
                        // Ideally these should be different, realistically they
                        // probably don't need to be.
                        $tip = wfEscapeJsString( $tool['tip'] );

                        #$key = $tool["key"];

                        $toolbar.="addButton('$image','$tip','$open','$close','$sample','$cssId');\n";
                }

                $toolbar.="/*]]>*/\n</script>";
                $toolbar.="\n</div>";
                return $toolbar;
        }

        /**
         * Returns an array of html code of the following checkboxes:
         * minor and watch
         *
         * @param $tabindex Current tabindex
         * @param $skin Skin object
         * @param $checked Array of checkbox => bool, where bool indicates the checked
         *                 status of the checkbox
         *
         * @return array
         */
        public static function getCheckboxes( &$tabindex, $skin, $checked ) {
                global $wgUser;

                $checkboxes = array();

                $checkboxes['minor'] = '';
                $minorLabel = wfMsgExt('minoredit', array('parseinline'));
                if ( $wgUser->isAllowed('minoredit') ) {
                        $attribs = array(
                                'tabindex'  => ++$tabindex,
                                'accesskey' => wfMsg( 'accesskey-minoredit' ),
                                'id'        => 'wpMinoredit',
                        );
                        $checkboxes['minor'] =
                                Xml::check( 'wpMinoredit', $checked['minor'], $attribs ) .
                                "&nbsp;<label for='wpMinoredit'".$skin->tooltipAndAccesskey('minoredit').">{$minorLabel}</label>";
                }

                $watchLabel = wfMsgExt('watchthis', array('parseinline'));
                $checkboxes['watch'] = '';
                if ( $wgUser->isLoggedIn() ) {
                        $attribs = array(
                                'tabindex'  => ++$tabindex,
                                'accesskey' => wfMsg( 'accesskey-watch' ),
                                'id'        => 'wpWatchthis',
                        );
                        $checkboxes['watch'] =
                                Xml::check( 'wpWatchthis', $checked['watch'], $attribs ) .
                                "&nbsp;<label for='wpWatchthis'".$skin->tooltipAndAccesskey('watch').">{$watchLabel}</label>";
                }
                return $checkboxes;
        }

        /**
         * Returns an array of html code of the following buttons:
         * save, diff, preview and live
         *
         * @param $tabindex Current tabindex
         *
         * @return array
         */
        public function getEditButtons(&$tabindex) {
                global $wgLivePreview, $wgUser;

                $buttons = array();

                $temp = array(
                        'id'        => 'wpSave',
                        'name'      => 'wpSave',
                        'type'      => 'submit',
                        'tabindex'  => ++$tabindex,
                        'value'     => wfMsg('savearticle'),
                        'accesskey' => wfMsg('accesskey-save'),
                        'title'     => wfMsg( 'tooltip-save' ).' ['.wfMsg( 'accesskey-save' ).']',
                );
                $buttons['save'] = wfElement('input', $temp, '');

                ++$tabindex; // use the same for preview and live preview
                if ( $wgLivePreview && $wgUser->getOption( 'uselivepreview' ) ) {
                        $temp = array(
                                'id'        => 'wpPreview',
                                'name'      => 'wpPreview',
                                'type'      => 'submit',
                                'tabindex'  => $tabindex,
                                'value'     => wfMsg('showpreview'),
                                'accesskey' => '',
                                'title'     => wfMsg( 'tooltip-preview' ).' ['.wfMsg( 'accesskey-preview' ).']',
                                'style'     => 'display: none;',
                        );
                        $buttons['preview'] = wfElement('input', $temp, '');

                        $temp = array(
                                'id'        => 'wpLivePreview',
                                'name'      => 'wpLivePreview',
                                'type'      => 'submit',
                                'tabindex'  => $tabindex,
                                'value'     => wfMsg('showlivepreview'),
                                'accesskey' => wfMsg('accesskey-preview'),
                                'title'     => '',
                                'onclick'   => $this->doLivePreviewScript(),
                        );
                        $buttons['live'] = wfElement('input', $temp, '');
                } else {
                        $temp = array(
                                'id'        => 'wpPreview',
                                'name'      => 'wpPreview',
                                'type'      => 'submit',
                                'tabindex'  => $tabindex,
                                'value'     => wfMsg('showpreview'),
                                'accesskey' => wfMsg('accesskey-preview'),
                                'title'     => wfMsg( 'tooltip-preview' ).' ['.wfMsg( 'accesskey-preview' ).']',
                        );
                        $buttons['preview'] = wfElement('input', $temp, '');
                        $buttons['live'] = '';
                }

                $temp = array(
                        'id'        => 'wpDiff',
                        'name'      => 'wpDiff',
                        'type'      => 'submit',
                        'tabindex'  => ++$tabindex,
                        'value'     => wfMsg('showdiff'),
                        'accesskey' => wfMsg('accesskey-diff'),
                        'title'     => wfMsg( 'tooltip-diff' ).' ['.wfMsg( 'accesskey-diff' ).']',
                );
                $buttons['diff'] = wfElement('input', $temp, '');

                return $buttons;
        }

        /**
         * Output preview text only. This can be sucked into the edit page
         * via JavaScript, and saves the server time rendering the skin as
         * well as theoretically being more robust on the client (doesn't
         * disturb the edit box's undo history, won't eat your text on
         * failure, etc).
         *
         * @todo This doesn't include category or interlanguage links.
         *       Would need to enhance it a bit, <s>maybe wrap them in XML
         *       or something...</s> that might also require more skin
         *       initialization, so check whether that's a problem.
         */
        function livePreview() {
                global $wgOut;
                $wgOut->disable();
                header( 'Content-type: text/xml; charset=utf-8' );
                header( 'Cache-control: no-cache' );

                $previewText = $this->getPreviewText();
                #$categories = $skin->getCategoryLinks();

                $s =
                '<?xml version="1.0" encoding="UTF-8" ?>' . "\n" .
                Xml::tags( 'livepreview', null,
                        Xml::element( 'preview', null, $previewText )
                        #.      Xml::element( 'category', null, $categories )
                );
                echo $s;
        }


        /**
         * Get a diff between the current contents of the edit box and the
         * version of the page we're editing from.
         *
         * If this is a section edit, we'll replace the section as for final
         * save and then make a comparison.
         */
        function showDiff() {
                $oldtext = $this->mArticle->fetchContent();
                $newtext = $this->mArticle->replaceSection(
                        $this->section, $this->textbox1, $this->summary, $this->edittime );
                $newtext = $this->mArticle->preSaveTransform( $newtext );
                $oldtitle = wfMsgExt( 'currentrev', array('parseinline') );
                $newtitle = wfMsgExt( 'yourtext', array('parseinline') );
                if ( $oldtext !== false  || $newtext != '' ) {
                        $de = new DifferenceEngine( $this->mTitle );
                        $de->setText( $oldtext, $newtext );
                        $difftext = $de->getDiff( $oldtitle, $newtitle );
                        $de->showDiffStyle();
                } else {
                        $difftext = '';
                }

                global $wgOut;
                $wgOut->addHtml( '<div id="wikiDiff">' . $difftext . '</div>' );
        }

        /**
         * Filter an input field through a Unicode de-armoring process if it
         * came from an old browser with known broken Unicode editing issues.
         *
         * @param WebRequest $request
         * @param string $field
         * @return string
         * @private
         */
        function safeUnicodeInput( $request, $field ) {
                $text = rtrim( $request->getText( $field ) );
                return $request->getBool( 'safemode' )
                        ? $this->unmakesafe( $text )
                        : $text;
        }

        /**
         * Filter an output field through a Unicode armoring process if it is
         * going to an old browser with known broken Unicode editing issues.
         *
         * @param string $text
         * @return string
         * @private
         */
        function safeUnicodeOutput( $text ) {
                global $wgContLang;
                $codedText = $wgContLang->recodeForEdit( $text );
                return $this->checkUnicodeCompliantBrowser()
                        ? $codedText
                        : $this->makesafe( $codedText );
        }

        /**
         * A number of web browsers are known to corrupt non-ASCII characters
         * in a UTF-8 text editing environment. To protect against this,
         * detected browsers will be served an armored version of the text,
         * with non-ASCII chars converted to numeric HTML character references.
         *
         * Preexisting such character references will have a 0 added to them
         * to ensure that round-trips do not alter the original data.
         *
         * @param string $invalue
         * @return string
         * @private
         */
        function makesafe( $invalue ) {
                // Armor existing references for reversability.
                $invalue = strtr( $invalue, array( "&#x" => "&#x0" ) );

                $bytesleft = 0;
                $result = "";
                $working = 0;
                for( $i = 0; $i < strlen( $invalue ); $i++ ) {
                        $bytevalue = ord( $invalue{$i} );
                        if( $bytevalue <= 0x7F ) { //0xxx xxxx
                                $result .= chr( $bytevalue );
                                $bytesleft = 0;
                        } elseif( $bytevalue <= 0xBF ) { //10xx xxxx
                                $working = $working << 6;
                                $working += ($bytevalue & 0x3F);
                                $bytesleft--;
                                if( $bytesleft <= 0 ) {
                                        $result .= "&#x" . strtoupper( dechex( $working ) ) . ";";
                                }
                        } elseif( $bytevalue <= 0xDF ) { //110x xxxx
                                $working = $bytevalue & 0x1F;
                                $bytesleft = 1;
                        } elseif( $bytevalue <= 0xEF ) { //1110 xxxx
                                $working = $bytevalue & 0x0F;
                                $bytesleft = 2;
                        } else { //1111 0xxx
                                $working = $bytevalue & 0x07;
                                $bytesleft = 3;
                        }
                }
                return $result;
        }

        /**
         * Reverse the previously applied transliteration of non-ASCII characters
         * back to UTF-8. Used to protect data from corruption by broken web browsers
         * as listed in $wgBrowserBlackList.
         *
         * @param string $invalue
         * @return string
         * @private
         */
        function unmakesafe( $invalue ) {
                $result = "";
                for( $i = 0; $i < strlen( $invalue ); $i++ ) {
                        if( ( substr( $invalue, $i, 3 ) == "&#x" ) && ( $invalue{$i+3} != '0' ) ) {
                                $i += 3;
                                $hexstring = "";
                                do {
                                        $hexstring .= $invalue{$i};
                                        $i++;
                                } while( ctype_xdigit( $invalue{$i} ) && ( $i < strlen( $invalue ) ) );

                                // Do some sanity checks. These aren't needed for reversability,
                                // but should help keep the breakage down if the editor
                                // breaks one of the entities whilst editing.
                                if ((substr($invalue,$i,1)==";") and (strlen($hexstring) <= 6)) {
                                        $codepoint = hexdec($hexstring);
                                        $result .= codepointToUtf8( $codepoint );
                                } else {
                                        $result .= "&#x" . $hexstring . substr( $invalue, $i, 1 );
                                }
                        } else {
                                $result .= substr( $invalue, $i, 1 );
                        }
                }
                // reverse the transform that we made for reversability reasons.
                return strtr( $result, array( "&#x0" => "&#x" ) );
        }

        function noCreatePermission() {
                global $wgOut;
                $wgOut->setPageTitle( wfMsg( 'nocreatetitle' ) );
                $wgOut->addWikiText( wfMsg( 'nocreatetext' ) );
        }
        
        /**
         * If there are rows in the deletion log for this page, show them,
         * along with a nice little note for the user
         *
         * @param OutputPage $out
         */
        private function showDeletionLog( $out ) {
                $title = $this->mTitle;
                $reader = new LogReader(
                        new FauxRequest(
                                array(
                                        'page' => $title->getPrefixedText(),
                                        'type' => 'delete',
                                        )
                        )
                );
                if( $reader->hasRows() ) {
                        $out->addHtml( '<div id="mw-recreate-deleted-warn">' );
                        $out->addWikiText( wfMsg( 'recreate-deleted-warn' ) );
                        $viewer = new LogViewer( $reader );
                        $viewer->showList( $out );
                        $out->addHtml( '</div>' );
                }
        }

        /**
         * Attempt submission
         * @return bool false if output is done, true if the rest of the form should be displayed
         */
        function attemptSave() {
                global $wgUser, $wgOut, $wgTitle;

                $resultDetails = false;
                $value = $this->internalAttemptSave( $resultDetails );
                
                if( $value == self::AS_SUCCESS_UPDATE || $value == self::AS_SUCCESS_NEW_ARTICLE ) {
                        $this->didSave = true;
                }

                switch ($value)
                {
                        case self::AS_HOOK_ERROR_EXPECTED:
                        case self::AS_CONTENT_TOO_BIG:
                        case self::AS_ARTICLE_WAS_DELETED:
                        case self::AS_CONFLICT_DETECTED:
                        case self::AS_SUMMARY_NEEDED:
                        case self::AS_TEXTBOX_EMPTY:
                        case self::AS_MAX_ARTICLE_SIZE_EXCEDED:
                        case self::AS_END:
                                return true;
                        
                        case self::AS_HOOK_ERROR:
                        case self::AS_FILTERING:
                        case self::AS_SUCCESS_NEW_ARTICLE:
                        case self::AS_SUCCESS_UPDATE:
                                return false;

                        case self::AS_SPAM_ERROR:
                                $this->spamPage ( $resultDetails['spam'] );
                                return false;

                        case self::AS_BLOCKED_PAGE_FOR_USER:
                                $this->blockedPage();
                                return false;

                        case self::AS_READ_ONLY_PAGE_ANON:
                                $this->userNotLoggedInPage();
                                return false;

                        case self::AS_READ_ONLY_PAGE_LOGGED:
                        case self::AS_READ_ONLY_PAGE:
                                $wgOut->readOnlyPage();
                                return false;

                        case self::AS_RATE_LIMITED:
                                $wgOut->rateLimited();
                                return false;

                        case self::AS_NO_CREATE_PERMISSION;
                                $this->noCreatePermission();
                                return;
                        
                        case self::AS_BLANK_ARTICLE:
                                $wgOut->redirect( $wgTitle->getFullURL() );
                                return false;
                }
        }
}