Bugfis, making ?uselang=qqq an invalid language code, see

[lhc/web/wiklou.git] / includes / EditPage.php

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

/**
 * 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_EXCEEDED      = 229;
        const AS_OK                             = 230;
        const AS_END                            = 231;
        const AS_SPAM_ERROR                     = 232;
        const AS_IMAGE_REDIRECT_ANON            = 233;
        const AS_IMAGE_REDIRECT_LOGGED          = 234;

        var $mArticle;
        var $mTitle;
        var $action;
        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;
        var $mParserOutput;
        var $mBaseRevision = false;

        # 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 $undidRev = 0;

        public $suppressIntro = false;

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

                # Placeholders for text injection by hooks (empty per default)
                $this->editFormPageTop =
                $this->editFormTextTop =
                $this->editFormTextBeforeContent =
                $this->editFormTextAfterWarn =
                $this->editFormTextAfterTools =
                $this->editFormTextBottom = "";
        }
        
        function getArticle() {
                return $this->mArticle;
        }

        /**
         * Fetch initial editing page content.
         * @private
         */
        function getContent( $def_text = '' ) {
                global $wgOut, $wgRequest, $wgParser, $wgContLang, $wgMessageCache;

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

                $text = '';
                // For message page not locally set, use the i18n message.
                // For other non-existent articles, use preload text if any.
                if ( !$this->mTitle->exists() ) {
                        if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
                                # If this is a system message, get the default text.
                                list( $message, $lang ) = $wgMessageCache->figureMessage( $wgContLang->lcfirst( $this->mTitle->getText() ) );
                                $wgMessageCache->loadAllMessages( $lang );
                                $text = wfMsgGetKey( $message, false, $lang, false );
                                if( wfEmptyMsg( $message, $text ) )
                                        $text = '';
                        } else {
                                # If requested, preload some text.
                                $text = $this->getPreloadedText( $preload );
                        }
                // For existing pages, get text based on "undo" or section parameters.
                } else {
                        $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,
                                # the revisions exist and they were not deleted.
                                # Otherwise, $text will be left as-is.
                                if ( !is_null( $undorev ) && !is_null( $oldrev ) &&
                                        $undorev->getPage() == $oldrev->getPage() &&
                                        $undorev->getPage() == $this->mArticle->getID() &&
                                        !$undorev->isDeleted( Revision::DELETED_TEXT ) &&
                                        !$oldrev->isDeleted( Revision::DELETED_TEXT ) ) {
                                        
                                        $undotext = $this->mArticle->getUndoText( $undorev, $oldrev );
                                        if ( $undotext === false ) {
                                                # Warn the user that something went wrong
                                                $this->editFormPageTop .= $wgOut->parse( '<div class="error mw-undo-failure">' . wfMsgNoTrans( 'undo-failure' ) . '</div>' );
                                        } else {
                                                $text = $undotext;
                                                # Inform the user of our success and set an automatic edit summary
                                                $this->editFormPageTop .= $wgOut->parse( '<div class="mw-undo-success">' . wfMsgNoTrans( 'undo-success' ) . '</div>' );
                                                $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->undidRev = $undo;
                                                }
                                                $this->formtype = 'diff';
                                        }
                                } else {
                                        // Failed basic sanity checks.
                                        // Older revisions may have been removed since the link
                                        // was created, or we may simply have got bogus input.
                                        $this->editFormPageTop .= $wgOut->parse( '<div class="error mw-undo-norev">' . wfMsgNoTrans( 'undo-norev' ) . '</div>' );
                                }
                        } 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.
         */
        protected 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, $wgContLang;
                $this->mMetaData = '';
                if ( !$wgUseMetadataEdit ) return;
                if ( $wgMetadataWhitelist == '' ) return;
                $s = '';
                $t = $this->getContent();

                # MISSING : <nowiki> filtering

                # Categories and language links
                $t = explode ( "\n" , $t );
                $catlow = strtolower ( $wgContLang->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 ( $wgContLang->getLanguageName( $ns ) || 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 ) );
                                } else {
                                        $x = implode ( ']]' , $y );
                                        $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;
        }

        /* 
         * Check if a page was deleted while the user was editing it, before submit.
         * Note that we rely on the logging table, which hasn't been always there,
         * but that doesn't matter, because this only applies to brand new
         * deletes.
         */
        protected function wasDeletedSinceLastEdit() {
                if ( $this->deletedSinceEdit )
                        return true;
                if ( $this->mTitle->isDeleted() ) {
                        $this->lastDelete = $this->getLastDelete();
                        if ( $this->lastDelete ) {
                                $deleteTime = wfTimestamp( TS_MW, $this->lastDelete->log_timestamp );
                                if ( $deleteTime > $this->starttime ) {
                                        $this->deletedSinceEdit = true;
                                }
                        }
                }
                return $this->deletedSinceEdit;
        }

        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, $wgRequest;
                // Allow extensions to modify/prevent this form or submission
                if ( !wfRunHooks( 'AlternateEdit', array( &$this ) ) ) {
                        return;
                }

                wfProfileIn( __METHOD__ );
                wfDebug( __METHOD__.": enter\n" );

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

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

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

                if ( wfReadOnly() && $this->save ) {
                                // Force preview
                                $this->save = false;
                                $this->preview = true;
                }

                $wgOut->addScriptFile( 'edit.js' );
                $permErrors = $this->getEditPermissionErrors();
                if ( $permErrors ) {
                        wfDebug( __METHOD__.": User can't edit\n" );
                        $this->readOnlyPage( $this->getContent(), true, $permErrors, 'edit' );
                        wfProfileOut( __METHOD__ );
                        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( __METHOD__."-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();

                # Show applicable editing introductions
                if ( $this->formtype == 'initial' || $this->firsttime )
                        $this->showIntro();

                if ( $this->mTitle->isTalkPage() ) {
                        $wgOut->addWikiMsg( 'talkpagetext' );
                }

                # Optional notices on a per-namespace and per-page basis
                $editnotice_ns   = 'editnotice-'.$this->mTitle->getNamespace();
                $editnotice_page = $editnotice_ns.'-'.$this->mTitle->getDBkey();
                if ( !wfEmptyMsg( $editnotice_ns, wfMsgForContent( $editnotice_ns ) ) ) {
                        $wgOut->addWikiText( wfMsgForContent( $editnotice_ns )  );
                }
                if ( MWNamespace::hasSubpages( $this->mTitle->getNamespace() ) ) {
                        $parts = explode( '/', $this->mTitle->getDBkey() );
                        $editnotice_base = $editnotice_ns;
                        while ( count( $parts ) > 0 ) {
                                $editnotice_base .= '-'.array_shift( $parts );
                                if ( !wfEmptyMsg( $editnotice_base, wfMsgForContent( $editnotice_base ) ) ) {
                                        $wgOut->addWikiText( wfMsgForContent( $editnotice_base )  );
                                }
                        }
                } else if ( !wfEmptyMsg( $editnotice_page, wfMsgForContent( $editnotice_page ) ) ) {
                        $wgOut->addWikiText( wfMsgForContent( $editnotice_page ) );
                }

                # 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( __METHOD__."-business-end" );
                                wfProfileOut( __METHOD__ );
                                return;
                        }
                }

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

                $this->showEditForm();
                wfProfileOut( __METHOD__."-business-end" );
                wfProfileOut( __METHOD__ );
        }
        
        protected function getEditPermissionErrors() {
                global $wgUser;
                $permErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
                # Can this title be created?
                if ( !$this->mTitle->exists() ) {
                        $permErrors = array_merge( $permErrors,
                                wfArrayDiff2( $this->mTitle->getUserPermissionsErrors( 'create', $wgUser ), $permErrors ) );
                }
                # Ignore some permissions errors when a user is just previewing/viewing diffs
                $remove = array();
                foreach( $permErrors as $error ) {
                        if ( ($this->preview || $this->diff) && 
                                ($error[0] == 'blockedtext' || $error[0] == 'autoblockedtext') )
                        {
                                $remove[] = $error;
                        }
                }
                $permErrors = wfArrayDiff2( $permErrors, $remove );
                return $permErrors;
        }

        /**
         * Show a read-only error
         * Parameters are the same as OutputPage:readOnlyPage()
         * Redirect to the article page if redlink=1
         */
        function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
                global $wgRequest, $wgOut;
                if ( $wgRequest->getBool( 'redlink' ) ) {
                        // The edit page was reached via a red link.
                        // Redirect to the article page and let them click the edit tab if
                        // they really want a permission error.
                        $wgOut->redirect( $this->mTitle->getFullUrl() );
                } else {
                        $wgOut->readOnlyPage( $source, $protected, $reasons, $action );
                }
        }

        /**
         * Should we show a preview when the edit form is first shown?
         *
         * @return bool
         */
        protected 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 );

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

                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 );

                        # Remove extra headings from summaries and new sections.
                        $this->summary = preg_replace('/^\s*=+\s*(.*?)\s*=+\s*$/', '$1', $this->summary);

                        $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 && !$this->diff;
                        if ( !preg_match( '/^\d{14}$/', $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 = $request->getBool( 'wpIgnoreBlankSummary' ) || !$wgUser->getOption( 'forceeditsummary');
                        }

                        $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;

                        if ( $this->section == 'new' && $request->getVal( 'preloadtitle' ) ) {
                                $this->summary = $request->getVal( 'preloadtitle' );
                        }
                        elseif ( $this->section != 'new' && $request->getVal( 'summary' ) ) {
                                $this->summary = $request->getText( 'summary' );
                        }
                        
                        if ( $request->getVal( 'minor' ) ) {
                                $this->minoredit = true;
                        }
                }

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

                $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
         */
        protected 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->wrapWikiMsg( '<div class="mw-userpage-userdoesnotexist error">$1</div>',
                                        array( 'userpage-userdoesnotexist', $username ) );
                        }
                }
                # Try to add a custom edit intro, or use the standard one if this is not possible.
                if ( !$this->showCustomIntro() && !$this->mTitle->exists() ) {
                        if ( $wgUser->isLoggedIn() ) {
                                $wgOut->wrapWikiMsg( '<div class="mw-newarticletext">$1</div>', 'newarticletext' );
                        } else {
                                $wgOut->wrapWikiMsg( '<div class="mw-newarticletextanon">$1</div>', 'newarticletextanon' );
                        }
                }
                # Give a notice if the user is editing a deleted page...
                if ( !$this->mTitle->exists() ) {
                        $this->showDeletionLog( $wgOut );
                }
        }

        /**
         * Attempt to show a custom editing introduction, if supplied
         *
         * @return bool
         */
        protected 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->addWikiTextTitleTidy( $revision->getText(), $this->mTitle );
                                return true;
                        } else {
                                return false;
                        }
                } else {
                        return false;
                }
        }

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

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

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

                # Check image redirect
                if ( $this->mTitle->getNamespace() == NS_FILE &&
                        Title::newFromRedirect( $this->textbox1 ) instanceof Title &&
                        !$wgUser->isAllowed( 'upload' ) ) {
                                if ( $wgUser->isAnon() ) {
                                        return self::AS_IMAGE_REDIRECT_ANON;
                                } else {
                                        return self::AS_IMAGE_REDIRECT_LOGGED;
                                }
                }

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

                # Check for spam
                $match = self::matchSpamRegex( $this->summary );
                if ( $match === false ) {
                        $match = self::matchSpamRegex( $this->textbox1 );
                }
                if ( $match !== false ) {
                        $result['spam'] = $match;
                        $ip = wfGetIP();
                        $pdbk = $this->mTitle->getPrefixedDBkey();
                        $match = str_replace( "\n", '', $match );
                        wfDebugLog( 'SpamRegex', "$ip spam regex hit [[$pdbk]]: \"$match\"" );
                        wfProfileOut( "$fname-checks" );
                        wfProfileOut( $fname );
                        return self::AS_SPAM_ERROR;
                }
                if ( $wgFilterCallback && $wgFilterCallback( $this->mTitle, $this->textbox1, $this->section, $this->hookError, $this->summary ) ) {
                        # Error messages or other handling should be performed by the filter function
                        wfProfileOut( "$fname-checks" );
                        wfProfileOut( $fname );
                        return self::AS_FILTERING;
                }
                if ( !wfRunHooks( 'EditFilter', array( $this, $this->textbox1, $this->section, &$this->hookError, $this->summary ) ) ) {
                        # Error messages etc. could be handled within the hook...
                        wfProfileOut( "$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( $this->mTitle, false ) ) {
                        # Check block state against master, thus 'false'.
                        wfProfileOut( "$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 ( $this->wasDeletedSinceLastEdit() && !$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, $this->summary ) ) ) {
                                # Error messages etc. could be handled within the hook...
                                wfProfileOut( $fname );
                                return self::AS_HOOK_ERROR;
                        }
                        
                        # Handle the user preference to force summaries here. Check if it's not a redirect.
                        if ( !$this->allowBlankSummary && !Title::newFromRedirect( $this->textbox1 ) ) {
                                if ( md5( $this->summary ) == $this->autoSumm ) {
                                        $this->missingSummary = true;
                                        wfProfileOut( $fname );
                                        return self::AS_SUMMARY_NEEDED;
                                }
                        }

                        $isComment = ( $this->section == 'new' );

                        $this->mArticle->insertNewArticle( $this->textbox1, $this->summary,
                                $this->minoredit, $this->watchthis, false, $isComment, $bot );

                        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();
                
                # Suppress edit conflict with self, except for section edits where merging is required.
                if ( $this->isConflict && $this->section == '' && $this->userWasLastToEdit($userid,$this->edittime) ) {
                        wfDebug( "EditPage::editForm Suppressing edit conflict, same user.\n" );
                        $this->isConflict = false;
                }

                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; // do not try to merge here!
                } else 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, $this->summary ) ) ) {
                        # Error messages etc. could be handled within the hook...
                        wfProfileOut( $fname );
                        return self::AS_HOOK_ERROR;
                }

                # Handle the user preference to force summaries here, but not for null edits
                if ( $this->section != 'new' && !$this->allowBlankSummary && 0 != strcmp($oldtext,$text) 
                        && !Title::newFromRedirect( $text ) ) # check if it's not a redirect
                {
                        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 ) {
                        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_EXCEEDED;
                }

                # update the article here
                if ( $this->mArticle->updateArticle( $text, $this->summary, $this->minoredit,
                        $this->watchthis, $bot, $sectionanchor ) ) 
                {
                        wfProfileOut( $fname );
                        return self::AS_SUCCESS_UPDATE;
                } else {
                        $this->isConflict = true;
                }
                wfProfileOut( $fname );
                return self::AS_END;
        }
        
        /**
         * Check if no edits were made by other users since
         * the time a user started editing the page. Limit to
         * 50 revisions for the sake of performance.
         */
        protected function userWasLastToEdit( $id, $edittime ) {
                if( !$id ) return false;
                $dbw = wfGetDB( DB_MASTER );
                $res = $dbw->select( 'revision',
                        'rev_user',
                        array( 
                                'rev_page' => $this->mArticle->getId(),
                                'rev_timestamp > '.$dbw->addQuotes( $dbw->timestamp($edittime) )
                        ),
                        __METHOD__,
                        array( 'ORDER BY' => 'rev_timestamp ASC', 'LIMIT' => 50 ) );
                while( $row = $res->fetchObject() ) {
                        if( $row->rev_user != $id ) {
                                return false;
                        }
                }
                return true;
        }
        
        /**
         * Check given input text against $wgSpamRegex, and return the text of the first match.
         * @return mixed -- matching string or false
         */
        public static function matchSpamRegex( $text ) {
                global $wgSpamRegex;
                if ( $wgSpamRegex ) {
                        // For back compatibility, $wgSpamRegex may be a single string or an array of regexes.
                        $regexes = (array)$wgSpamRegex;
                        foreach( $regexes as $regex ) {
                                $matches = array();
                                if ( preg_match( $regex, $text, $matches ) ) {
                                        return $matches[0];
                                }
                        }
                }
                return false;
        }

        /**
         * 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->textbox1 = $this->getContent( false );
                if ( $this->textbox1 === false ) return false;
                wfProxyCheck();
                return true;
        }

        function setHeaders() {
                global $wgOut, $wgTitle;
                $wgOut->setRobotPolicy( 'noindex,nofollow' );
                if ( $this->formtype == 'preview' ) {
                        $wgOut->setPageTitleActionText( wfMsg( 'preview' ) );
                }
                if ( $this->isConflict ) {
                        $wgOut->setPageTitle( wfMsg( 'editconflict', $wgTitle->getPrefixedText() ) );
                } elseif ( $this->section != '' ) {
                        $msg = $this->section == 'new' ? 'editingcomment' : 'editingsection';
                        $wgOut->setPageTitle( wfMsg( $msg, $wgTitle->getPrefixedText() ) );
                } else {
                        # Use the title defined by DISPLAYTITLE magic word when present
                        if ( isset($this->mParserOutput)
                         && ( $dt = $this->mParserOutput->getDisplayTitle() ) !== false ) {
                                $title = $dt;
                        } else {
                                $title = $wgTitle->getPrefixedText();
                        }
                        $wgOut->setPageTitle( wfMsg( 'editing', $title ) );
                }
        }

        /**
         * 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, $wgRequest;

                # If $wgTitle is null, that means we're in API mode.
                # Some hook probably called this function  without checking
                # for is_null($wgTitle) first. Bail out right here so we don't
                # do lots of work just to discard it right after.
                if (is_null($wgTitle))
                        return;

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

                $sk = $wgUser->getSkin();

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

                #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
                #we parse this near the beginning so that setHeaders can do the title
                #setting work instead of leaving it in getPreviewText
                $previewOutput = '';
                if ( $this->formtype == 'preview' ) {
                        $previewOutput = $this->getPreviewText();
                }

                $this->setHeaders();

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

                if ( $this->isConflict ) {
                        $wgOut->addWikiMsg( 'explainconflict' );

                        $this->textbox2 = $this->textbox1;
                        $this->textbox1 = $this->getContent();
                        $this->edittime = $this->mArticle->getTimestamp();
                } else {
                        if ( $this->section != '' && $this->section != 'new' ) {
                                $matches = array();
                                if ( !$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])) .
                                                        " */ ";
                                        }
                                }
                        }

                        if ( $this->missingComment ) {
                                $wgOut->wrapWikiMsg( '<div id="mw-missingcommenttext">$1</div>',  'missingcommenttext' );
                        }

                        if ( $this->missingSummary && $this->section != 'new' ) {
                                $wgOut->wrapWikiMsg( '<div id="mw-missingsummary">$1</div>', 'missingsummary' );
                        }

                        if ( $this->missingSummary && $this->section == 'new' ) {
                                $wgOut->wrapWikiMsg( '<div id="mw-missingcommentheader">$1</div>', 'missingcommentheader' );
                        }

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

                        if ( !$this->checkUnicodeCompliantBrowser() ) {
                                $wgOut->addWikiMsg( '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->addWikiMsg( 'rev-deleted-text-permission' );
                                } else if ( $this->mArticle->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
                                        $wgOut->addWikiMsg( 'rev-deleted-text-view' );
                                }

                                if ( !$this->mArticle->mRevision->isCurrent() ) {
                                        $this->mArticle->setOldSubtitle( $this->mArticle->mRevision->getId() );
                                        $wgOut->addWikiMsg( 'editingold' );
                                }
                        }
                }

                if ( wfReadOnly() ) {
                        $wgOut->wrapWikiMsg( "<div id=\"mw-read-only-warning\">\n$1\n</div>", array( 'readonlywarning', wfReadOnlyReason() ) );
                } elseif ( $wgUser->isAnon() && $this->formtype != 'preview' ) {
                        $wgOut->wrapWikiMsg( '<div id="mw-anon-edit-warning">$1</div>', 'anoneditwarning' );
                } else {
                        if ( $this->isCssJsSubpage ) {
                                # Check the skin exists
                                if ( $this->isValidCssJsSubpage ) {
                                        if ( $this->formtype !== 'preview' ) {
                                                $wgOut->addWikiMsg( 'usercssjsyoucanpreview' );
                                        }
                                } else {
                                        $wgOut->addWikiMsg( 'userinvalidcssjstitle', $wgTitle->getSkinFromCssJsSubpage() );
                                }
                        }
                }

                $classes = array(); // Textarea CSS
                if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
                        # Show a warning if editing an interface message
                        $wgOut->addWikiMsg( 'editinginterface' );
                } elseif ( $this->mTitle->isProtected( 'edit' ) ) {
                        # Is the title semi-protected?
                        if ( $this->mTitle->isSemiProtected() ) {
                                $noticeMsg = 'semiprotectedpagewarning';
                                $classes[] = 'mw-textarea-sprotected';
                        } else {
                                # Then it must be protected based on static groups (regular)
                                $noticeMsg = 'protectedpagewarning';
                                $classes[] = 'mw-textarea-protected';
                        }
                        $wgOut->addHTML( "<div class='mw-warning-with-logexcerpt'>\n" );
                        $wgOut->addWikiMsg( $noticeMsg );
                        LogEventsList::showLogExtract( $wgOut, 'protect', $this->mTitle->getPrefixedText(), '', 1 );
                        $wgOut->addHTML( "</div>\n" );
                }
                if ( $this->mTitle->isCascadeProtected() ) {
                        # Is this page under cascading protection from some source pages?
                        list($cascadeSources, /* $restrictions */) = $this->mTitle->getCascadeProtectionSources();
                        $notice = "<div class='mw-cascadeprotectedwarning'>$1\n";
                        $cascadeSourcesCount = count( $cascadeSources );
                        if ( $cascadeSourcesCount > 0 ) {
                                # Explain, and list the titles responsible
                                foreach( $cascadeSources as $page ) {
                                        $notice .= '* [[:' . $page->getPrefixedText() . "]]\n";
                                }
                        }
                        $notice .= '</div>';
                        $wgOut->wrapWikiMsg( $notice, array( 'cascadeprotectedwarning', $cascadeSourcesCount ) );
                }
                if ( !$this->mTitle->exists() && $this->mTitle->getRestrictions( 'create' ) ) {
                        $wgOut->wrapWikiMsg( '<div class="mw-titleprotectedwarning">$1</div>', 'titleprotectedwarning' );
                }

                if ( $this->kblength === false ) {
                        $this->kblength = (int)(strlen( $this->textbox1 ) / 1024);
                }
                if ( $this->tooBig || $this->kblength > $wgMaxArticleSize ) {
                        $wgOut->addHTML( "<div class='error' id='mw-edit-longpageerror'>\n" );
                        $wgOut->addWikiMsg( 'longpageerror', $wgLang->formatNum( $this->kblength ), $wgLang->formatNum( $wgMaxArticleSize ) );
                        $wgOut->addHTML( "</div>\n" );
                } elseif ( $this->kblength > 29 ) {
                        $wgOut->addHTML( "<div id='mw-edit-longpagewarning'>\n" );
                        $wgOut->addWikiMsg( 'longpagewarning', $wgLang->formatNum( $this->kblength ) );
                        $wgOut->addHTML( "</div>\n" );
                }

                $q = 'action='.$this->action;
                #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')) );
                $separator = wfMsgExt( 'pipe-separator' , 'escapenoentities' );
                $edithelpurl = Skin::makeInternalOrExternalUrl( wfMsgForContent( 'edithelppage' ));
                $edithelp = '<a target="helpwindow" href="'.$edithelpurl.'">'.
                        htmlspecialchars( wfMsg( 'edithelp' ) ).'</a> '.
                        htmlspecialchars( wfMsg( 'newwindow' ) );

                global $wgRightsText;
                if ( $wgRightsText ) {
                        $copywarnMsg = array( 'copyrightwarning',
                                '[[' . wfMsgForContent( 'copyrightpage' ) . ']]',
                                $wgRightsText );
                } else {
                        $copywarnMsg = array( 'copyrightwarning2',
                                '[[' . wfMsgForContent( 'copyrightpage' ) . ']]' );
                }

                if ( $wgUser->getOption('showtoolbar') and !$this->isCssJsSubpage ) {
                        # prepare toolbar for edit buttons
                        $toolbar = EditPage::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;
                        }
                        
                        # May be overriden by request parameters
                        if( $wgRequest->getBool( 'watchthis' ) ) {
                                $this->watchthis = true;
                        }

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

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

                if ( $wgUser->getOption( 'previewontop' ) ) {
                        $this->displayPreviewArea( $previewOutput, true );
                }


                $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 a blank edit summary was previously provided, and the appropriate
                # user preference is active, pass a hidden tag as wpIgnoreBlankSummary. This will stop the
                # user being bounced back more than once in the event that a summary
                # is not required.
                #####
                # For a bit more sophisticated detection of blank summaries, hash the
                # automatic one and pass that in the hidden field wpAutoSummary.
                $summaryhiddens =  '';
                if ( $this->missingSummary ) $summaryhiddens .= Xml::hidden( 'wpIgnoreBlankSummary', true );
                $autosumm = $this->autoSumm ? $this->autoSumm : md5( $this->summary );
                $summaryhiddens .= Xml::hidden( 'wpAutoSummary', $autosumm );
                if ( $this->section == 'new' ) {
                        $commentsubject = $wgRequest->getBool( 'nosummary' ) ? '' : "<span id='wpSummaryLabel'><label for='wpSummary'>{$subject}</label></span>\n<input tabindex='1' type='text' value=\"$summarytext\" name='wpSummary' id='wpSummary' maxlength='200' size='60' />{$summaryhiddens}<br />";
                        $editsummary = "<div class='editOptions'>\n";
                        global $wgParser;
                        $formattedSummary = wfMsgForContent( 'newsectionsummary', $wgParser->stripSectionName( $this->summary ) );
                        $subjectpreview = $summarytext && $this->preview ? "<div class=\"mw-summary-preview\">". wfMsg('subject-preview') . $sk->commentBlock( $formattedSummary, $this->mTitle, true )."</div>\n" : '';
                        $summarypreview = '';
                } else {
                        $commentsubject = '';
                        $editsummary="<div class='editOptions'>\n<span id='wpSummaryLabel'><label for='wpSummary'>{$summary}</label></span>\n<input tabindex='2' type='text' value=\"$summarytext\" name='wpSummary' id='wpSummary' maxlength='200' size='60' />{$summaryhiddens}<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->getTemplates();
                $formattedtemplates = $sk->formatTemplates( $templates, $this->preview, $this->section != '');

                $hiddencats = $this->mArticle->getHiddenCategories();
                $formattedhiddencats = $sk->formatHiddenCategories( $hiddencats );

                global $wgUseMetadataEdit ;
                if ( $wgUseMetadataEdit ) {
                        $metadata = $this->mMetaData ;
                        $metadata = htmlspecialchars( $wgContLang->recodeForEdit( $metadata ) ) ;
                        $top = wfMsgWikiHtml( 'metadata_help' );
                        /* ToDo: Replace with clean code */
                        $ew = $wgUser->getOption( 'editwidth' );
                        if ( $ew ) $ew = " style=\"width:100%\"";
                        else $ew = '';
                        $cols = $wgUser->getIntOption( 'cols' );
                        /* /ToDo */
                        $metadata = $top . "<textarea name='metadata' rows='3' cols='{$cols}'{$ew}>{$metadata}</textarea>" ;
                }
                else $metadata = "" ;

                $recreate = '';
                if ( $this->wasDeletedSinceLastEdit() ) {
                        if ( 'save' != $this->formtype ) {
                                $wgOut->wrapWikiMsg( '<div class="error mw-deleted-while-editing">$1</div>', 'deletedwhileediting' );
                        } else {
                                // Hide the toolbar and edit area, user can click preview to get it back
                                // Add an confirmation checkbox and explanation.
                                $toolbar = '';
                                $recreate = '<div class="mw-confirm-recreate">' .
                                                $wgOut->parse( wfMsg( 'confirmrecreate',  $this->lastDelete->user_name , $this->lastDelete->log_comment ) ) .
                                                Xml::checkLabel( wfMsg( 'recreate' ), 'wpRecreate', 'wpRecreate', false,
                                                        array( 'title' => $sk->titleAttrib( 'recreate' ), 'tabindex' => 1, 'id' => 'wpRecreate' )
                                                ) . '</div>';
                        }
                }

                $tabindex = 2;

                $checkboxes = $this->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
                $this->showFormBeforeText();

                $wgOut->addHTML( <<<END
{$recreate}
{$commentsubject}
{$subjectpreview}
{$this->editFormTextBeforeContent}
END
);
                $this->showTextbox1( $classes );

                $wgOut->wrapWikiMsg( "<div id=\"editpage-copywarn\">\n$1\n</div>", $copywarnMsg );
                $wgOut->addHTML( <<<END
{$this->editFormTextAfterWarn}
{$metadata}
{$editsummary}
{$summarypreview}
{$checkboxhtml}
{$safemodehtml}
END
);

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

                /**
                 * 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" );

                $this->showEditTools();

                $wgOut->addHTML( <<<END
{$this->editFormTextAfterTools}
<div class='templatesUsed'>
{$formattedtemplates}
</div>
<div class='hiddencats'>
{$formattedhiddencats}
</div>
END
);

                if ( $this->isConflict && wfRunHooks( 'EditPageBeforeConflictDiff', array( &$this, &$wgOut ) ) ) {
                        $wgOut->wrapWikiMsg( '==$1==', "yourdiff" );

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

                        $wgOut->wrapWikiMsg( '==$1==', "yourtext" );
                        $this->showTextbox2();
                }
                $wgOut->addHTML( $this->editFormTextBottom );
                $wgOut->addHTML( "</form>\n" );
                if ( !$wgUser->getOption( 'previewontop' ) ) {
                        $this->displayPreviewArea( $previewOutput, false );
                }

                wfProfileOut( $fname );
        }

        protected function showFormBeforeText() {
                global $wgOut;
                $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" );
        }
        
        protected function showTextbox1( $classes ) {
                $attribs = array( 'tabindex' => 1 );
                
                if ( $this->wasDeletedSinceLastEdit() )
                        $attribs['type'] = 'hidden';
                if ( !empty($classes) )
                        $attribs['class'] = implode(' ',$classes);
                
                $this->showTextbox( $this->textbox1, 'wpTextbox1', $attribs );
        }
        
        protected function showTextbox2() {
                $this->showTextbox( $this->textbox2, 'wpTextbox2', array( 'tabindex' => 6 ) );
        }
        
        protected function showTextbox( $content, $name, $attribs = array() ) {
                global $wgOut, $wgUser;
                
                $wikitext = $this->safeUnicodeOutput( $content );
                if ( $wikitext !== '' ) {
                        // Ensure there's a newline at the end, otherwise adding lines
                        // is awkward.
                        // But don't add a newline if the ext is empty, or Firefox in XHTML
                        // mode will show an extra newline. A bit annoying.
                        $wikitext .= "\n";
                }
                
                $attribs['accesskey'] = ',';
                $attribs['id'] = $name;
                
                if ( $wgUser->getOption( 'editwidth' ) )
                        $attribs['style'] = 'width: 100%';
                
                $wgOut->addHTML( Xml::textarea(
                        $name,
                        $wikitext,
                        $wgUser->getIntOption( 'cols' ), $wgUser->getIntOption( 'rows' ),
                        $attribs ) );
        }

        protected function displayPreviewArea( $previewOutput, $isOnTop = false ) {
                global $wgOut;
                $classes = array();
                if ( $isOnTop )
                        $classes[] = 'ontop';

                $attribs = array( 'id' => 'wikiPreview', 'class' => implode( ' ', $classes ) );

                if ( $this->formtype != 'preview' )
                        $attribs['style'] = 'display: none;';

                $wgOut->addHTML( Xml::openElement( 'div', $attribs ) );

                if ( $this->formtype == 'preview' ) {
                        $this->showPreview( $previewOutput );
                }

                $wgOut->addHTML( '</div>' );

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

        /**
         * 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.
         */
        protected function showPreview( $text ) {
                global $wgOut;
                if ( $this->mTitle->getNamespace() == NS_CATEGORY) {
                        $this->mArticle->openShowCategory();
                }
                # This hook seems slightly odd here, but makes things more
                # consistent for extensions.
                wfRunHooks( 'OutputPageBeforeHTML',array( &$wgOut, &$text ) );
                $wgOut->addHTML( $text );
                if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
                        $this->mArticle->closeShowCategory();
                }
        }

        /**
         * 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 $wgOut, $wgTitle;
                $wgOut->addScriptFile( 'preview.js' );
                $liveAction = $wgTitle->getLocalUrl( "action={$this->action}&wpPreview=true&live=true" );
                return "return !lpDoPreview(" .
                        "editform.wpTextbox1.value," .
                        '"' . $liveAction . '"' . ")";
        }

        protected function showEditTools() {
                global $wgOut;
                $wgOut->addHTML( '<div class="mw-editTools">' );
                $wgOut->addWikiMsgArray( 'edittools', array(), array( 'content' ) );
                $wgOut->addHTML( '</div>' );
        }

        function getLastDelete() {
                $dbr = wfGetDB( DB_SLAVE );
                $data = $dbr->selectRow(
                        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' ),
                        __METHOD__,
                        array( 'LIMIT' => 1, 'ORDER BY' => 'log_timestamp DESC' ) );

                return $data;
        }

        /**
         * Get the rendered text for previewing.
         * @return string
         */
        function getPreviewText() {
                global $wgOut, $wgUser, $wgTitle, $wgParser, $wgLang, $wgContLang, $wgMessageCache;

                wfProfileIn( __METHOD__ );

                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 );
                $parserOptions->setIsPreview( true );
                $parserOptions->setIsSectionPreview( !is_null($this->section) && $this->section !== '' );

                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 );
                        $previewHTML = $parserOutput->mText;
                } elseif ( $rt = Title::newFromRedirectArray( $this->textbox1 ) ) {
                        $previewHTML = $this->mArticle->viewRedirect( $rt, false );
                } 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;

                        // Parse mediawiki messages with correct target language
                        if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
                                list( /* $unused */, $lang ) = $wgMessageCache->figureMessage( $this->mTitle->getText() );
                                $obj = wfGetLangObj( $lang );
                                $parserOptions->setTargetLanguage( $obj );
                        }


                        $parserOptions->setTidy(true);
                        $parserOptions->enableLimitReport();
                        $parserOutput = $wgParser->parse( $this->mArticle->preSaveTransform( $toparse ),
                                        $this->mTitle, $parserOptions );

                        $previewHTML = $parserOutput->getText();
                        $this->mParserOutput = $parserOutput;
                        $wgOut->addParserOutputNoText( $parserOutput );

                        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( __METHOD__ );
                return $previewhead . $previewHTML;
        }
        
        function getTemplates() {
                if ( $this->preview || $this->section != '' ) {
                        $templates = array();
                        if ( !isset($this->mParserOutput) ) return $templates;
                        foreach( $this->mParserOutput->getTemplates() as $ns => $template) {
                                foreach( array_keys( $template ) as $dbk ) {
                                        $templates[] = Title::makeTitle($ns, $dbk);
                                }
                        }
                        return $templates;
                } else {
                        return $this->mArticle->getUsedTemplates();
                }
        }

        /**
         * 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->getIntOption( 'rows' );
                        $cols = $wgUser->getIntOption( 'cols' );
                        $attribs = array( 'id' => 'wpTextbox1', 'name' => 'wpTextbox1', 'cols' => $cols, 'rows' => $rows, 'readonly' => 'readonly' );
                        $wgOut->addHTML( '<hr />' );
                        $wgOut->addWikiMsg( $first ? 'blockedoriginalsource' : 'blockededitsource', $this->mTitle->getPrefixedText() );
                        # Why we don't use Xml::element here?
                        # Is it because if $source is '', it returns <textarea />?
                        $wgOut->addHTML( Xml::openElement( 'textarea', $attribs ) . htmlspecialchars( $source ) . Xml::closeElement( '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 nonexistent section.
         */
        function noSuchSectionPage() {
                global $wgOut, $wgTitle;

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

                $wgOut->addWikiMsg( '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->addHTML( '<div id="spamprotected">' );
                $wgOut->addWikiMsg( 'spamprotectiontext' );
                if ( $match )
                        $wgOut->addWikiMsg( 'spamprotectionmatch', wfEscapeWikiText( $match ) );
                $wgOut->addHTML( '</div>' );

                $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 = $this->getBaseRevision();
                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 skins/common/edit.js.
         * 
         * @return string
         */
        static function getEditToolbar() {
                global $wgStylePath, $wgContLang, $wgLang, $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'  => $wgLang->getImageFile('button-bold'),
                                'id'     => 'mw-editbutton-bold',
                                'open'   => '\'\'\'',
                                'close'  => '\'\'\'',
                                'sample' => wfMsg('bold_sample'),
                                'tip'    => wfMsg('bold_tip'),
                                'key'    => 'B'
                        ),
                        array(
                                'image'  => $wgLang->getImageFile('button-italic'),
                                'id'     => 'mw-editbutton-italic',
                                'open'   => '\'\'',
                                'close'  => '\'\'',
                                'sample' => wfMsg('italic_sample'),
                                'tip'    => wfMsg('italic_tip'),
                                'key'    => 'I'
                        ),
                        array(
                                'image'  => $wgLang->getImageFile('button-link'),
                                'id'     => 'mw-editbutton-link',
                                'open'   => '[[',
                                'close'  => ']]',
                                'sample' => wfMsg('link_sample'),
                                'tip'    => wfMsg('link_tip'),
                                'key'    => 'L'
                        ),
                        array(
                                'image'  => $wgLang->getImageFile('button-extlink'),
                                'id'     => 'mw-editbutton-extlink',
                                'open'   => '[',
                                'close'  => ']',
                                'sample' => wfMsg('extlink_sample'),
                                'tip'    => wfMsg('extlink_tip'),
                                'key'    => 'X'
                        ),
                        array(
                                'image'  => $wgLang->getImageFile('button-headline'),
                                'id'     => 'mw-editbutton-headline',
                                'open'   => "\n== ",
                                'close'  => " ==\n",
                                'sample' => wfMsg('headline_sample'),
                                'tip'    => wfMsg('headline_tip'),
                                'key'    => 'H'
                        ),
                        array(
                                'image'  => $wgLang->getImageFile('button-image'),
                                'id'     => 'mw-editbutton-image',
                                'open'   => '[['.$wgContLang->getNsText(NS_FILE).':',
                                'close'  => ']]',
                                'sample' => wfMsg('image_sample'),
                                'tip'    => wfMsg('image_tip'),
                                'key'    => 'D'
                        ),
                        array(
                                'image'  => $wgLang->getImageFile('button-media'),
                                'id'     => 'mw-editbutton-media',
                                'open'   => '[['.$wgContLang->getNsText(NS_MEDIA).':',
                                'close'  => ']]',
                                'sample' => wfMsg('media_sample'),
                                'tip'    => wfMsg('media_tip'),
                                'key'    => 'M'
                        ),
                        array(
                                'image'  => $wgLang->getImageFile('button-math'),
                                'id'     => 'mw-editbutton-math',
                                'open'   => "<math>",
                                'close'  => "</math>",
                                'sample' => wfMsg('math_sample'),
                                'tip'    => wfMsg('math_tip'),
                                'key'    => 'C'
                        ),
                        array(
                                'image'  => $wgLang->getImageFile('button-nowiki'),
                                'id'     => 'mw-editbutton-nowiki',
                                'open'   => "<nowiki>",
                                'close'  => "</nowiki>",
                                'sample' => wfMsg('nowiki_sample'),
                                'tip'    => wfMsg('nowiki_tip'),
                                'key'    => 'N'
                        ),
                        array(
                                'image'  => $wgLang->getImageFile('button-sig'),
                                'id'     => 'mw-editbutton-signature',
                                'open'   => '--~~~~',
                                'close'  => '',
                                'sample' => '',
                                'tip'    => wfMsg('sig_tip'),
                                'key'    => 'Y'
                        ),
                        array(
                                'image'  => $wgLang->getImageFile('button-hr'),
                                '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) {
                        $params = array(
                                $image = $wgStylePath.'/common/images/'.$tool['image'],
                                // 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 = $tool['tip'],
                                $open = $tool['open'],
                                $close = $tool['close'],
                                $sample = $tool['sample'],
                                $cssId = $tool['id'],
                        );

                        $paramList = implode( ',',
                                array_map( array( 'Xml', 'encodeJsVar' ), $params ) );
                        $toolbar.="addButton($paramList);\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 $checked Array of checkbox => bool, where bool indicates the checked
         *                 status of the checkbox
         *
         * @return array
         */
        public function getCheckboxes( &$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->tooltip('minoredit', 'withaccess').">{$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->tooltip('watch', 'withaccess').">{$watchLabel}</label>";
                }
                wfRunHooks( 'EditPageBeforeEditChecks', array( &$this, &$checkboxes, &$tabindex ) );
                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'] = Xml::element('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'] = Xml::element('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'] = Xml::element('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'] = Xml::element('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'] = Xml::element('input', $temp, '');

                wfRunHooks( 'EditPageBeforeEditButtons', array( &$this, &$buttons, &$tabindex ) );
                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->addWikiMsg( '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
         */
        protected function showDeletionLog( $out ) {
                global $wgUser;
                $loglist = new LogEventsList( $wgUser->getSkin(), $out );
                $pager = new LogPager( $loglist, 'delete', false, $this->mTitle->getPrefixedText() );
                $count = $pager->getNumRows();
                if ( $count > 0 ) {
                        $pager->mLimit = 10;
                        $out->addHTML( '<div class="mw-warning-with-logexcerpt">' );
                        $out->addWikiMsg( 'recreate-deleted-warn' );
                        $out->addHTML(
                                $loglist->beginLogEventsList() .
                                $pager->getBody() .
                                $loglist->endLogEventsList()
                        );
                        if($count > 10){
                                $out->addHTML( $wgUser->getSkin()->link(
                                        SpecialPage::getTitleFor( 'Log' ),
                                        wfMsgHtml( 'deletelog-fulllog' ),
                                        array(),
                                        array(
                                                'type' => 'delete',
                                                'page' => $this->mTitle->getPrefixedText() ) ) );
                        }
                        $out->addHTML( '</div>' );
                        return true;
                }
                
                return false;
        }

        /**
         * 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, $wgRequest;

                $resultDetails = false;
                # Allow bots to exempt some edits from bot flagging
                $bot = $wgUser->isAllowed('bot') && $wgRequest->getBool('bot',true);
                $value = $this->internalAttemptSave( $resultDetails, $bot );

                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_EXCEEDED:
                        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_IMAGE_REDIRECT_ANON:
                                $wgOut->showErrorPage( 'uploadnologin', 'uploadnologintext' );
                                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;

                        case self::AS_IMAGE_REDIRECT_LOGGED:
                                $wgOut->permissionRequired( 'upload' );
                                return false;
                }
        }
        
        function getBaseRevision() {
                if ( $this->mBaseRevision == false ) {
                        $db = wfGetDB( DB_MASTER );
                        $baseRevision = Revision::loadFromTimestamp(
                                $db, $this->mTitle, $this->edittime );
                        return $this->mBaseRevision = $baseRevision;
                } else {
                        return $this->mBaseRevision;
                }
        }
}