(bug 30074) Moving user JS subpages resulted in JS errors because #REDIRECT [[Foo...

[mediawiki.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:
 * $this->mContextTitle 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 Article
         */
        var $mArticle;

        /**
         * @var Title
         */
        var $mTitle;
        private $mContextTitle = null;
        var $action;
        var $isConflict = false;
        var $isCssJsSubpage = false;
        var $isCssSubpage = false;
        var $isJsSubpage = false;
        var $isWrongCaseCssJsPage = false;
        var $isNew = false; // new page or new section
        var $deletedSinceEdit;
        var $formtype;
        var $firsttime;
        var $lastDelete;
        var $mTokenOk = false;
        var $mTokenOkExceptSuffix = false;
        var $mTriedSave = false;
        var $incompleteForm = false;
        var $tooBig = false;
        var $kblength = false;
        var $missingComment = false;
        var $missingSummary = false;
        var $allowBlankSummary = false;
        var $autoSumm = '';
        var $hookError = '';
        #var $mPreviewTemplates;

        /**
         * @var ParserOutput
         */
        var $mParserOutput;

        var $mBaseRevision = false;
        var $mShowSummaryField = true;

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

        # 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;
        public $editFormTextAfterContent;
        public $previewTextAfterContent;
        public $mPreloadText;

        /* $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 Article
         */
        function __construct( $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 =
                $this->editFormTextAfterContent =
                $this->previewTextAfterContent =
                $this->mPreloadText = "";
        }

        /**
         * @return Article
         */
        function getArticle() {
                return $this->mArticle;
        }

        /**
         * Set the context Title object
         *
         * @param $title Title object or null
         */
        public function setContextTitle( $title ) {
                $this->mContextTitle = $title;
        }

        /**
         * Get the context title object.
         * If not set, $wgTitle will be returned. This behavior might changed in
         * the future to return $this->mTitle instead.
         *
         * @return Title object
         */
        public function getContextTitle() {
                if ( is_null( $this->mContextTitle ) ) {
                        global $wgTitle;
                        return $wgTitle;
                } else {
                        return $this->mContextTitle;
                }
        }

        /**
         * Fetch initial editing page content.
         *
         * @param $def_text string
         * @returns mixed string on success, $def_text for invalid sections
         * @private
         */
        function getContent( $def_text = '' ) {
                global $wgOut, $wgRequest, $wgParser;

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

                $preload = $wgRequest->getVal( 'preload',
                        // Custom preload text for new sections
                        $section === 'new' ? 'MediaWiki:addsection-preload' : '' );
                $undoafter = $wgRequest->getVal( 'undoafter' );
                $undo = $wgRequest->getVal( 'undo' );

                // 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.
                                $text = $this->mTitle->getDefaultMessageText();
                                if( $text === false ) {
                                        $text = $this->getPreloadedText( $preload );
                                }
                        } 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>' );
                                }
                        } elseif ( $section != '' ) {
                                if ( $section == 'new' ) {
                                        $text = $this->getPreloadedText( $preload );
                                } else {
                                        // Get section edit text (returns $def_text for invalid sections)
                                        $text = $wgParser->getSection( $text, $section, $def_text );
                                }
                        }
                }

                wfProfileOut( __METHOD__ );
                return $text;
        }

        /**
         * Use this method before edit() to preload some text into the edit box
         *
         * @param $text string
         */
        public function setPreloadedText( $text ) {
                $this->mPreloadText = $text;
        }

        /**
         * Get the contents to be preloaded into the box, either set by
         * an earlier setPreloadText() or by loading the given page.
         *
         * @param $preload String: representing the title to preload from.
         * @return String
         */
        protected function getPreloadedText( $preload ) {
                global $wgUser, $wgParser;
                if ( !empty( $this->mPreloadText ) ) {
                        return $this->mPreloadText;
                } elseif ( $preload !== '' ) {
                        $title = Title::newFromText( $preload );
                        # Check for existence to avoid getting MediaWiki:Noarticletext
                        if ( isset( $title ) && $title->exists() && $title->userCanRead() ) {
                                $article = new Article( $title );

                                if ( $article->isRedirect() ) {
                                        $title = Title::newFromRedirectRecurse( $article->getContent() );
                                        # Redirects to missing titles are displayed, to hidden pages are followed
                                        # Copying observed behaviour from ?action=view
                                        if ( $title->exists() ) {
                                                if ($title->userCanRead() ) {
                                                        $article = new Article( $title );
                                                } else {
                                                        return "";
                                                }
                                        }
                                }
                                $parserOptions = ParserOptions::newFromUser( $wgUser );
                                return $wgParser->getPreloadText( $article->getContent(), $title, $parserOptions );
                        }
                }
                return '';
        }

        /**
         * 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 !== null ) {
                        return $this->deletedSinceEdit;
                }

                $this->deletedSinceEdit = false;

                if ( $this->mTitle->isDeletedQuick() ) {
                        $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;
        }

        /**
         * Checks whether the user entered a skin name in uppercase,
         * e.g. "User:Example/Monobook.css" instead of "monobook.css"
         *
         * @return bool
         */
        protected function isWrongCaseCssJsPage() {
                if( $this->mTitle->isCssJsSubpage() ) {
                        $name = $this->mTitle->getSkinFromCssJsSubpage();
                        $skins = array_merge(
                                array_keys( Skin::getSkinNames() ),
                                array( 'common' )
                        );
                        return !in_array( $name, $skins )
                                && in_array( strtolower( $name ), $skins );
                } else {
                        return false;
                }
        }

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

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

                $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->addModules( array( 'mediawiki.action.edit' ) );

                if ( $wgUser->getOption( 'uselivepreview', false ) ) {
                        $wgOut->addModules( 'mediawiki.legacy.preview' );
                }
                // Bug #19334: textarea jumps when editing articles in IE8
                $wgOut->addStyle( 'common/IE80Fixes.css', 'screen', 'IE 8' );

                $permErrors = $this->getEditPermissionErrors();
                if ( $permErrors ) {
                        wfDebug( __METHOD__ . ": User can't edit\n" );
                        $content = $this->getContent( null );
                        $content = $content === '' ? null : $content;
                        $this->readOnlyPage( $content, true, $permErrors, 'edit' );
                        wfProfileOut( __METHOD__ );
                        return;
                } else {
                        if ( $this->save ) {
                                $this->formtype = 'save';
                        } elseif ( $this->preview ) {
                                $this->formtype = 'preview';
                        } elseif ( $this->diff ) {
                                $this->formtype = 'diff';
                        } else { # First time through
                                $this->firsttime = true;
                                if ( $this->previewOnOpen() ) {
                                        $this->formtype = 'preview';
                                } else {
                                        $this->formtype = 'initial';
                                }
                        }
                }

                // If they used redlink=1 and the page exists, redirect to the main article
                if ( $wgRequest->getBool( 'redlink' ) && $this->mTitle->exists() ) {
                        $wgOut->redirect( $this->mTitle->getFullURL() );
                }

                wfProfileIn( __METHOD__."-business-end" );

                $this->isConflict = false;
                // css / js subpages of user pages get a special treatment
                $this->isCssJsSubpage       = $this->mTitle->isCssJsSubpage();
                $this->isCssSubpage         = $this->mTitle->isCssSubpage();
                $this->isJsSubpage          = $this->mTitle->isJsSubpage();
                $this->isWrongCaseCssJsPage = $this->isWrongCaseCssJsPage();
                $this->isNew                = !$this->mTitle->exists() || $this->section == 'new';

                # 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_ns_message = wfMessage( $editnotice_ns )->inContentLanguage();
                if ( $editnotice_ns_message->exists() ) {
                        $wgOut->addWikiText( $editnotice_ns_message->plain() );
                }
                if ( MWNamespace::hasSubpages( $this->mTitle->getNamespace() ) ) {
                        $parts = explode( '/', $this->mTitle->getDBkey() );
                        $editnotice_base = $editnotice_ns;
                        while ( count( $parts ) > 0 ) {
                                $editnotice_base .= '-'.array_shift( $parts );
                                $editnotice_base_msg = wfMessage( $editnotice_base )->inContentLanguage();
                                if ( $editnotice_base_msg->exists() ) {
                                        $wgOut->addWikiText( $editnotice_base_msg->plain()  );
                                }
                        }
                }

                # 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 ) );
                        else
                                wfRunHooks( 'EditFormInitialText', array( $this ) );
                }

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

        /**
         * @return array
         */
        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, $wgPreviewOnOpenNamespaces;
                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' ) !== null || $this->mTitle->exists() ) && $wgUser->getOption( 'previewonfirst' ) ) {
                        // Standard preference behaviour
                        return true;
                } elseif ( !$this->mTitle->exists() &&
                  isset($wgPreviewOnOpenNamespaces[$this->mTitle->getNamespace()]) &&
                  $wgPreviewOnOpenNamespaces[$this->mTitle->getNamespace()] )
                {
                        // Categories are special
                        return true;
                } else {
                        return false;
                }
        }

        /**
         * Does this EditPage class support section editing?
         * This is used by EditPage subclasses to indicate their ui cannot handle section edits
         *
         * @return bool
         */
        protected function isSectionEditSupported() {
                return true;
        }

        /**
         * Returns the URL to use in the form's action attribute.
         * This is used by EditPage subclasses when simply customizing the action
         * variable in the constructor is not enough. This can be used when the
         * EditPage lives inside of a Special page rather than a custom page action.
         *
         * @param $title Title object for which is being edited (where we go to for &action= links)
         * @return string
         */
        protected function getActionURL( Title $title ) {
                return $title->getLocalURL( array( 'action' => $this->action ) );
        }

        /**
         * @todo document
         * @param $request WebRequest
         */
        function importFormData( &$request ) {
                global $wgLang, $wgUser;

                wfProfileIn( __METHOD__ );

                # 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( $request, 'wpTextbox1' );
                        if ( !$request->getCheck('wpTextbox2') ) {
                                // Skip this if wpTextbox2 has input, it indicates that we came
                                // from a conflict page with raw page text, not a custom form
                                // modified by subclasses
                                wfProfileIn( get_class($this)."::importContentFormData" );
                                $textbox1 = $this->importContentFormData( $request );
                                if ( isset($textbox1) )
                                        $this->textbox1 = $textbox1;
                                wfProfileOut( get_class($this)."::importContentFormData" );
                        }

                        # 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 ($this->textbox1 === '' && $request->getVal( 'wpTextbox1' ) === null) {
                                // wpTextbox1 field is missing, possibly due to being "too big"
                                // according to some filter rules such as Suhosin's setting for
                                // suhosin.request.max_value_length (d'oh)
                                $this->incompleteForm = true;
                        } else {
                                // edittime should be one of our last fields; if it's missing,
                                // the submission probably broke somewhere in the middle.
                                $this->incompleteForm = is_null( $this->edittime );
                        }
                        if ( $this->incompleteForm ) {
                                # If the form is incomplete, force to preview.
                                wfDebug( __METHOD__ . ": 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( __METHOD__ . ": Passed token check.\n" );
                                } elseif ( $this->diff ) {
                                        # Failed token check, but only requested "Show Changes".
                                        wfDebug( __METHOD__ . ": Failed token check; Show Changes requested.\n" );
                                } else {
                                        # Page might be a hack attempt posted from
                                        # an external site. Preview instead of saving.
                                        wfDebug( __METHOD__ . ": 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( __METHOD__ . ": Not a posted form.\n" );
                        $this->textbox1  = '';
                        $this->summary   = '';
                        $this->edittime  = '';
                        $this->starttime = wfTimestampNow();
                        $this->edit      = false;
                        $this->preview   = false;
                        $this->save      = false;
                        $this->diff      = false;
                        $this->minoredit = false;
                        $this->watchthis = $request->getBool( 'watchthis', false ); // Watch may be overriden by request parameters
                        $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->bot = $request->getBool( 'bot', true );
                $this->nosummary = $request->getBool( 'nosummary' );

                // @todo FIXME: Unused variable?
                $this->oldid = $request->getInt( 'oldid' );

                $this->live = $request->getCheck( 'live' );
                $this->editintro = $request->getText( 'editintro',
                        // Custom edit intro for new sections
                        $this->section === 'new' ? 'MediaWiki:addsection-editintro' : '' );

                // Allow extensions to modify form data
                wfRunHooks( 'EditPage::importFormData', array( $this, $request ) );

                wfProfileOut( __METHOD__ );
        }

        /**
         * Subpage overridable method for extracting the page content data from the
         * posted form to be placed in $this->textbox1, if using customized input
         * this method should be overrided and return the page text that will be used
         * for saving, preview parsing and so on...
         *
         * @param $request WebRequest
         */
        protected function importContentFormData( &$request ) {
                return; // Don't do anything, EditPage already extracted wpTextbox1
        }

        /**
         * 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;
                }

                $namespace = $this->mTitle->getNamespace();

                if ( $namespace == NS_MEDIAWIKI ) {
                        # Show a warning if editing an interface message
                        $wgOut->wrapWikiMsg( "<div class='mw-editinginterface'>\n$1\n</div>", 'editinginterface' );
                }

                # Show a warning message when someone creates/edits a user (talk) page but the user does not exist
                # Show log extract when the user is currently blocked
                if ( $namespace == NS_USER || $namespace == NS_USER_TALK ) {
                        $parts = explode( '/', $this->mTitle->getText(), 2 );
                        $username = $parts[0];
                        $user = User::newFromName( $username, false /* allow IP users*/ );
                        $ip = User::isIP( $username );
                        if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
                                $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n$1\n</div>",
                                        array( 'userpage-userdoesnotexist', wfEscapeWikiText( $username ) ) );
                        } elseif ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
                                LogEventsList::showLogExtract(
                                        $wgOut,
                                        'block',
                                        $user->getUserPage()->getPrefixedText(),
                                        '',
                                        array(
                                                'lim' => 1,
                                                'showIfEmpty' => false,
                                                'msgKey' => array(
                                                        'blocked-notice-logextract',
                                                        $user->getName() # Support GENDER in notice
                                                )
                                        )
                                );
                        }
                }
                # Try to add a custom edit intro, or use the standard one if this is not possible.
                if ( !$this->showCustomIntro() && !$this->mTitle->exists() ) {
                        if ( $wgUser->isLoggedIn() ) {
                                $wgOut->wrapWikiMsg( "<div class=\"mw-newarticletext\">\n$1\n</div>", 'newarticletext' );
                        } else {
                                $wgOut->wrapWikiMsg( "<div class=\"mw-newarticletextanon\">\n$1\n</div>", 'newarticletextanon' );
                        }
                }
                # Give a notice if the user is editing a deleted/moved page...
                if ( !$this->mTitle->exists() ) {
                        LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(),
                                '', array( 'lim' => 10,
                                           'conds' => array( "log_action != 'revision'" ),
                                           'showIfEmpty' => false,
                                           'msgKey' => array( 'recreate-moveddeleted-warn') )
                        );
                }
        }

        /**
         * 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;
                                // Added using template syntax, to take <noinclude>'s into account.
                                $wgOut->addWikiTextTitleTidy( '{{:' . $title->getFullText() . '}}', $this->mTitle );
                                return true;
                        } else {
                                return false;
                        }
                } else {
                        return false;
                }
        }

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

                wfProfileIn( __METHOD__  );
                wfProfileIn( __METHOD__ . '-checks' );

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

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

                                wfProfileOut( __METHOD__ . '-checks' );
                                wfProfileOut( __METHOD__  );

                                return $isAnon ? self::AS_IMAGE_REDIRECT_ANON : self::AS_IMAGE_REDIRECT_LOGGED;
                }

                # Check for spam
                $match = self::matchSummarySpamRegex( $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( __METHOD__ . '-checks' );
                        wfProfileOut( __METHOD__ );
                        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( __METHOD__ . '-checks' );
                        wfProfileOut( __METHOD__ );
                        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( __METHOD__ . '-checks' );
                        wfProfileOut( __METHOD__ );
                        return self::AS_HOOK_ERROR;
                } elseif ( $this->hookError != '' ) {
                        # ...or the hook could be expecting us to produce an error
                        wfProfileOut( __METHOD__ . '-checks' );
                        wfProfileOut( __METHOD__ );
                        return self::AS_HOOK_ERROR_EXPECTED;
                }
                if ( $wgUser->isBlockedFrom( $this->mTitle, false ) ) {
                        # Check block state against master, thus 'false'.
                        wfProfileOut( __METHOD__ . '-checks' );
                        wfProfileOut( __METHOD__ );
                        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( __METHOD__ . '-checks' );
                        wfProfileOut( __METHOD__ );
                        return self::AS_CONTENT_TOO_BIG;
                }

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

                if ( wfReadOnly() ) {
                        wfProfileOut( __METHOD__ . '-checks' );
                        wfProfileOut( __METHOD__ );
                        return self::AS_READ_ONLY_PAGE;
                }
                if ( $wgUser->pingLimiter() ) {
                        wfProfileOut( __METHOD__ . '-checks' );
                        wfProfileOut( __METHOD__ );
                        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( __METHOD__ . '-checks' );
                        wfProfileOut( __METHOD__ );
                        return self::AS_ARTICLE_WAS_DELETED;
                }

                wfProfileOut( __METHOD__ . '-checks' );

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

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

                        # Don't save a new article if it's blank.
                        if ( $this->textbox1 == '' ) {
                                wfProfileOut( __METHOD__ );
                                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( __METHOD__ );
                                return self::AS_HOOK_ERROR;
                        } elseif ( $this->hookError != '' ) {
                                # ...or the hook could be expecting us to produce an error
                                wfProfileOut( __METHOD__ );
                                return self::AS_HOOK_ERROR_EXPECTED;
                        }

                        # 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( __METHOD__ );
                                        return self::AS_SUMMARY_NEEDED;
                                }
                        }

                        $text = $this->textbox1;
                        if ( $this->section == 'new' && $this->summary != '' ) {
                                $text = wfMsgForContent( 'newsectionheaderdefaultlevel', $this->summary ) . "\n\n" . $text;
                        }

                        $retval = self::AS_SUCCESS_NEW_ARTICLE;

                } else {

                        # Article exists. Check for edit conflict.

                        $this->mArticle->clear(); # Force reload of dates, etc.

                        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( __METHOD__ . ": duplicate new section submission; trigger edit conflict!\n" );
                                        } else {
                                                // New comment; suppress conflict.
                                                $this->isConflict = false;
                                                wfDebug( __METHOD__ .": conflict suppressed; new section\n" );
                                        }
                                } elseif ( $this->section == '' && $this->userWasLastToEdit( $wgUser->getId(), $this->edittime ) ) {
                                        # Suppress edit conflict with self, except for section edits where merging is required.
                                        wfDebug( __METHOD__ . ": Suppressing edit conflict, same user.\n" );
                                        $this->isConflict = false;
                                }
                        }

                        if ( $this->isConflict ) {
                                wfDebug( __METHOD__ . ": conflict! getting section '$this->section' for time '$this->edittime' (article time '" .
                                        $this->mArticle->getTimestamp() . "')\n" );
                                $text = $this->mArticle->replaceSection( $this->section, $this->textbox1, $this->summary, $this->edittime );
                        } else {
                                wfDebug( __METHOD__ . ": getting section '$this->section'\n" );
                                $text = $this->mArticle->replaceSection( $this->section, $this->textbox1, $this->summary );
                        }
                        if ( is_null( $text ) ) {
                                wfDebug( __METHOD__ . ": activating conflict; section replace failed.\n" );
                                $this->isConflict = true;
                                $text = $this->textbox1; // do not try to merge here!
                        } elseif ( $this->isConflict ) {
                                # Attempt merge
                                if ( $this->mergeChangesInto( $text ) ) {
                                        // Successful merge! Maybe we should tell the user the good news?
                                        $this->isConflict = false;
                                        wfDebug( __METHOD__ . ": Suppressing edit conflict, successful merge.\n" );
                                } else {
                                        $this->section = '';
                                        $this->textbox1 = $text;
                                        wfDebug( __METHOD__ . ": Keeping edit conflict, failed merge.\n" );
                                }
                        }

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

                        // 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( __METHOD__ );
                                return self::AS_HOOK_ERROR;
                        } elseif ( $this->hookError != '' ) {
                                # ...or the hook could be expecting us to produce an error
                                wfProfileOut( __METHOD__ );
                                return self::AS_HOOK_ERROR_EXPECTED;
                        }

                        # Handle the user preference to force summaries here, but not for null edits
                        if ( $this->section != 'new' && !$this->allowBlankSummary
                                && 0 != strcmp( $this->mArticle->getContent(), $text )
                                && !Title::newFromRedirect( $text ) ) # check if it's not a redirect
                        {
                                if ( md5( $this->summary ) == $this->autoSumm ) {
                                        $this->missingSummary = true;
                                        wfProfileOut( __METHOD__ );
                                        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( __METHOD__ );
                                        return self::AS_SUMMARY_NEEDED;
                                }
                        }

                        # All's well
                        wfProfileIn( __METHOD__ . '-sectionanchor' );
                        $sectionanchor = '';
                        if ( $this->section == 'new' ) {
                                if ( $this->textbox1 == '' ) {
                                        $this->missingComment = true;
                                        wfProfileOut( __METHOD__ . '-sectionanchor' );
                                        wfProfileOut( __METHOD__ );
                                        return self::AS_TEXTBOX_EMPTY;
                                }
                                if ( $this->summary != '' ) {
                                        $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $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 && strlen( $matches[2] ) > 0 ) {
                                        $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $matches[2] );
                                }
                        }
                        $result['sectionanchor'] = $sectionanchor;
                        wfProfileOut( __METHOD__ . '-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 = '';

                        $retval = self::AS_SUCCESS_UPDATE;
                }

                // 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( __METHOD__ );
                        return self::AS_MAX_ARTICLE_SIZE_EXCEEDED;
                }

                $flags = EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
                        ( $new ? EDIT_NEW : EDIT_UPDATE ) |
                        ( ( $this->minoredit && !$this->isNew ) ? EDIT_MINOR : 0 ) |
                        ( $bot ? EDIT_FORCE_BOT : 0 );

                $status = $this->mArticle->doEdit( $text, $this->summary, $flags );

                if ( $status->isOK() ) {
                        $result['redirect'] = Title::newFromRedirect( $text ) !== null;
                        $this->commitWatch();
                        wfProfileOut( __METHOD__ );
                        return $retval;
                } else {
                        $this->isConflict = true;
                        wfProfileOut( __METHOD__ );
                        return self::AS_END;
                }
        }

        /**
         * Commit the change of watch status
         */
        protected function commitWatch() {
                global $wgUser;
                if ( $this->watchthis xor $this->mTitle->userIsWatching() ) {
                        $dbw = wfGetDB( DB_MASTER );
                        $dbw->begin();
                        if ( $this->watchthis ) {
                                WatchAction::doWatch( $this->mTitle, $wgUser );
                        } else {
                                WatchAction::doUnwatch( $this->mTitle, $wgUser );
                        }
                        $dbw->commit();
                }
        }

        /**
         * 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.
         *
         * @param $id int
         * @param $edittime string
         *
         * @return bool
         */
        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 ) );
                foreach ( $res as $row ) {
                        if( $row->rev_user != $id ) {
                                return false;
                        }
                }
                return true;
        }

        /**
         * Check given input text against $wgSpamRegex, and return the text of the first match.
         *
         * @param $text string
         *
         * @return string|false matching string or false
         */
        public static function matchSpamRegex( $text ) {
                global $wgSpamRegex;
                // For back compatibility, $wgSpamRegex may be a single string or an array of regexes.
                $regexes = (array)$wgSpamRegex;
                return self::matchSpamRegexInternal( $text, $regexes );
        }

        /**
         * Check given input text against $wgSpamRegex, and return the text of the first match.
         *
         * @parma $text string
         *
         * @return string|false  matching string or false
         */
        public static function matchSummarySpamRegex( $text ) {
                global $wgSummarySpamRegex;
                $regexes = (array)$wgSummarySpamRegex;
                return self::matchSpamRegexInternal( $text, $regexes );
        }

        /**
         * @param $text string
         * @param $regexes array
         * @return bool|string
         */
        protected static function matchSpamRegexInternal( $text, $regexes ) {
                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
         * @return bool -- if the requested section is valid
         */
        function initialiseForm() {
                global $wgUser;
                $this->edittime = $this->mArticle->getTimestamp();
                $this->textbox1 = $this->getContent( false );
                // activate checkboxes if user wants them to be always active
                # Sort out the "watch" checkbox
                if ( $wgUser->getOption( 'watchdefault' ) ) {
                        # Watch all edits
                        $this->watchthis = true;
                } elseif ( $wgUser->getOption( 'watchcreations' ) && !$this->mTitle->exists() ) {
                        # Watch creations
                        $this->watchthis = true;
                } elseif ( $this->mTitle->userIsWatching() ) {
                        # Already watched
                        $this->watchthis = true;
                }
                if ( $wgUser->getOption( 'minordefault' ) && !$this->isNew ) {
                        $this->minoredit = true;
                }
                if ( $this->textbox1 === false ) {
                        return false;
                }
                wfProxyCheck();
                return true;
        }

        function setHeaders() {
                global $wgOut;
                $wgOut->setRobotPolicy( 'noindex,nofollow' );
                if ( $this->formtype == 'preview' ) {
                        $wgOut->setPageTitleActionText( wfMsg( 'preview' ) );
                }
                if ( $this->isConflict ) {
                        $wgOut->setPageTitle( wfMsg( 'editconflict', $this->getContextTitle()->getPrefixedText() ) );
                } elseif ( $this->section != '' ) {
                        $msg = $this->section == 'new' ? 'editingcomment' : 'editingsection';
                        $wgOut->setPageTitle( wfMsg( $msg, $this->getContextTitle()->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 = $this->getContextTitle()->getPrefixedText();
                        }
                        $wgOut->setPageTitle( wfMsg( 'editing', $title ) );
                }
        }

        /**
         * Send the edit form and related headers to $wgOut
         * @param $formCallback Callback 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;

                wfProfileIn( __METHOD__ );

                #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();
                }

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

                $this->setHeaders();

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

                if ( $this->showHeader() === false ) {
                        wfProfileOut( __METHOD__ );
                        return;
                }

                $action = htmlspecialchars( $this->getActionURL( $this->getContextTitle() ) );

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


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

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

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

                $templates = $this->getTemplates();
                $formattedtemplates = Linker::formatTemplates( $templates, $this->preview, $this->section != '');

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

                if ( $this->wasDeletedSinceLastEdit() && 'save' != $this->formtype ) {
                        $wgOut->wrapWikiMsg(
                                "<div class='error mw-deleted-while-editing'>\n$1\n</div>",
                                'deletedwhileediting' );
                } elseif ( $this->wasDeletedSinceLastEdit() ) {
                        // Hide the toolbar and edit area, user can click preview to get it back
                        // Add an confirmation checkbox and explanation.
                        $toolbar = '';
                        // @todo move this to a cleaner conditional instead of blanking a variable
                }
                $wgOut->addHTML( <<<HTML
<form id="editform" name="editform" method="post" action="$action" enctype="multipart/form-data">
HTML
);

                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();

                if ( $this->wasDeletedSinceLastEdit() && 'save' == $this->formtype ) {
                        $username = $this->lastDelete->user_name;
                        $comment = $this->lastDelete->log_comment;

                        // It is better to not parse the comment at all than to have templates expanded in the middle
                        // TODO: can the checkLabel be moved outside of the div so that wrapWikiMsg could be used?
                        $key = $comment === ''
                                ? 'confirmrecreate-noreason'
                                : 'confirmrecreate';
                        $wgOut->addHTML(
                                '<div class="mw-confirm-recreate">' .
                                wfMsgExt( $key, 'parseinline', $username, "<nowiki>$comment</nowiki>" ) .
                                Xml::checkLabel( wfMsg( 'recreate' ), 'wpRecreate', 'wpRecreate', false,
                                        array( 'title' => Linker::titleAttrib( 'recreate' ), 'tabindex' => 1, 'id' => 'wpRecreate' )
                                ) .
                                '</div>'
                        );
                }

                # 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.
                if ( $this->missingSummary ||
                        ( $this->section == 'new' && $this->nosummary ) )
                                $wgOut->addHTML( Html::hidden( 'wpIgnoreBlankSummary', true ) );
                $autosumm = $this->autoSumm ? $this->autoSumm : md5( $this->summary );
                $wgOut->addHTML( Html::hidden( 'wpAutoSummary', $autosumm ) );

                $wgOut->addHTML( Html::hidden( 'oldid', $this->mArticle->getOldID() ) );

                if ( $this->section == 'new' ) {
                        $this->showSummaryInput( true, $this->summary );
                        $wgOut->addHTML( $this->getSummaryPreview( true, $this->summary ) );
                }

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

                $wgOut->addHTML( $toolbar );

                if ( $this->isConflict ) {
                        // In an edit conflict bypass the overrideable content form method
                        // and fallback to the raw wpTextbox1 since editconflicts can't be
                        // resolved between page source edits and custom ui edits using the
                        // custom edit ui.
                        $this->showTextbox1( null, $this->getContent() );
                } else {
                        $this->showContentForm();
                }

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

                $wgOut->addWikiText( $this->getCopywarn() );
                if ( isset($this->editFormTextAfterWarn) && $this->editFormTextAfterWarn !== '' )
                        $wgOut->addHTML( $this->editFormTextAfterWarn );

                $this->showStandardInputs();

                $this->showFormAfterText();

                $this->showTosSummary();
                $this->showEditTools();

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

                if ( $this->isConflict )
                        $this->showConflict();

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

                wfProfileOut( __METHOD__ );
        }

        protected function showHeader() {
                global $wgOut, $wgUser, $wgMaxArticleSize, $wgLang;
                if ( $this->isConflict ) {
                        $wgOut->wrapWikiMsg( "<div class='mw-explainconflict'>\n$1\n</div>", 'explainconflict' );
                        $this->edittime = $this->mArticle->getTimestamp();
                } else {
                        if ( $this->section != '' && !$this->isSectionEditSupported() ) {
                                // We use $this->section to much before this and getVal('wgSection') directly in other places
                                // at this point we can't reset $this->section to '' to fallback to non-section editing.
                                // Someone is welcome to try refactoring though
                                $wgOut->showErrorPage( 'sectioneditnotsupported-title', 'sectioneditnotsupported-text' );
                                return false;
                        }

                        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'>\n$1\n</div>", 'missingcommenttext' );
                        }

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

                        if ( $this->missingSummary && $this->section == 'new' ) {
                                $wgOut->wrapWikiMsg( "<div id='mw-missingcommentheader'>\n$1\n</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->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
                                } elseif ( $this->mArticle->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
                                        $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", '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() ) {
                        if ( $this->formtype != 'preview' ) {
                                $wgOut->wrapWikiMsg( "<div id=\"mw-anon-edit-warning\">\n$1</div>", 'anoneditwarning' );
                        } else {
                                $wgOut->wrapWikiMsg( "<div id=\"mw-anon-preview-warning\">\n$1</div>", 'anonpreviewwarning' );
                        }
                } else {
                        if ( $this->isCssJsSubpage ) {
                                # Check the skin exists
                                if ( $this->isWrongCaseCssJsPage ) {
                                        $wgOut->wrapWikiMsg( "<div class='error' id='mw-userinvalidcssjstitle'>\n$1\n</div>", array( 'userinvalidcssjstitle', $this->getContextTitle()->getSkinFromCssJsSubpage() ) );
                                }
                                if ( $this->formtype !== 'preview' ) {
                                        if ( $this->isCssSubpage )
                                                $wgOut->wrapWikiMsg( "<div id='mw-usercssyoucanpreview'>\n$1\n</div>", array( 'usercssyoucanpreview' ) );
                                        if ( $this->isJsSubpage )
                                                $wgOut->wrapWikiMsg( "<div id='mw-userjsyoucanpreview'>\n$1\n</div>", array( 'userjsyoucanpreview' ) );
                                }
                        }
                }

                if ( $this->mTitle->getNamespace() != NS_MEDIAWIKI && $this->mTitle->isProtected( 'edit' ) ) {
                        # Is the title semi-protected?
                        if ( $this->mTitle->isSemiProtected() ) {
                                $noticeMsg = 'semiprotectedpagewarning';
                        } else {
                                # Then it must be protected based on static groups (regular)
                                $noticeMsg = 'protectedpagewarning';
                        }
                        LogEventsList::showLogExtract( $wgOut, 'protect', $this->mTitle->getPrefixedText(), '',
                                array( 'lim' => 1, 'msgKey' => array( $noticeMsg ) ) );
                }
                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'>\n$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' ) ) {
                        LogEventsList::showLogExtract( $wgOut, 'protect', $this->mTitle->getPrefixedText(), '',
                                array(  'lim' => 1,
                                        'showIfEmpty' => false,
                                        'msgKey' => array( 'titleprotectedwarning' ),
                                        'wrap' => "<div class=\"mw-titleprotectedwarning\">\n$1</div>" ) );
                }

                if ( $this->kblength === false ) {
                        $this->kblength = (int)( strlen( $this->textbox1 ) / 1024 );
                }

                if ( $this->tooBig || $this->kblength > $wgMaxArticleSize ) {
                        $wgOut->wrapWikiMsg( "<div class='error' id='mw-edit-longpageerror'>\n$1\n</div>",
                                array( 'longpageerror', $wgLang->formatNum( $this->kblength ), $wgLang->formatNum( $wgMaxArticleSize ) ) );
                } else {
                        if( !wfMessage('longpage-hint')->isDisabled() ) {
                                $wgOut->wrapWikiMsg( "<div id='mw-edit-longpage-hint'>\n$1\n</div>",
                                        array( 'longpage-hint', $wgLang->formatSize( strlen( $this->textbox1 ) ), strlen( $this->textbox1 ) )
                                );
                        }
                }
        }

        /**
         * Standard summary input and label (wgSummary), abstracted so EditPage
         * subclasses may reorganize the form.
         * Note that you do not need to worry about the label's for=, it will be
         * inferred by the id given to the input. You can remove them both by
         * passing array( 'id' => false ) to $userInputAttrs.
         *
         * @param $summary string The value of the summary input
         * @param $labelText string The html to place inside the label
         * @param $inputAttrs array of attrs to use on the input
         * @param $spanLabelAttrs array of attrs to use on the span inside the label
         *
         * @return array An array in the format array( $label, $input )
         */
        function getSummaryInput($summary = "", $labelText = null, $inputAttrs = null, $spanLabelAttrs = null) {
                //Note: the maxlength is overriden in JS to 250 and to make it use UTF-8 bytes, not characters.
                $inputAttrs = ( is_array($inputAttrs) ? $inputAttrs : array() ) + array(
                        'id' => 'wpSummary',
                        'maxlength' => '200',
                        'tabindex' => '1',
                        'size' => 60,
                        'spellcheck' => 'true',
                ) + Linker::tooltipAndAccesskeyAttribs( 'summary' );

                $spanLabelAttrs = ( is_array($spanLabelAttrs) ? $spanLabelAttrs : array() ) + array(
                        'class' => $this->missingSummary ? 'mw-summarymissed' : 'mw-summary',
                        'id' => "wpSummaryLabel"
                );

                $label = null;
                if ( $labelText ) {
                        $label = Xml::tags( 'label', $inputAttrs['id'] ? array( 'for' => $inputAttrs['id'] ) : null, $labelText );
                        $label = Xml::tags( 'span', $spanLabelAttrs, $label );
                }

                $input = Html::input( 'wpSummary', $summary, 'text', $inputAttrs );

                return array( $label, $input );
        }

        /**
         * @param $isSubjectPreview Boolean: true if this is the section subject/title
         *                          up top, or false if this is the comment summary
         *                          down below the textarea
         * @param $summary String: The text of the summary to display
         * @return String
         */
        protected function showSummaryInput( $isSubjectPreview, $summary = "" ) {
                global $wgOut, $wgContLang;
                # Add a class if 'missingsummary' is triggered to allow styling of the summary line
                $summaryClass = $this->missingSummary ? 'mw-summarymissed' : 'mw-summary';
                if ( $isSubjectPreview ) {
                        if ( $this->nosummary ) {
                                return;
                        }
                } else {
                        if ( !$this->mShowSummaryField ) {
                                return;
                        }
                }
                $summary = $wgContLang->recodeForEdit( $summary );
                $labelText = wfMsgExt( $isSubjectPreview ? 'subject' : 'summary', 'parseinline' );
                list($label, $input) = $this->getSummaryInput($summary, $labelText, array( 'class' => $summaryClass ), array());
                $wgOut->addHTML("{$label} {$input}");
        }

        /**
         * @param $isSubjectPreview Boolean: true if this is the section subject/title
         *                          up top, or false if this is the comment summary
         *                          down below the textarea
         * @param $summary String: the text of the summary to display
         * @return String
         */
        protected function getSummaryPreview( $isSubjectPreview, $summary = "" ) {
                if ( !$summary || ( !$this->preview && !$this->diff ) )
                        return "";

                global $wgParser;

                if ( $isSubjectPreview )
                        $summary = wfMsgForContent( 'newsectionsummary', $wgParser->stripSectionName( $summary ) );

                $message = $isSubjectPreview ? 'subject-preview' : 'summary-preview';

                $summary = wfMsgExt( $message, 'parseinline' ) . Linker::commentBlock( $summary, $this->mTitle, $isSubjectPreview );
                return Xml::tags( 'div', array( 'class' => 'mw-summary-preview' ), $summary );
        }

        protected function showFormBeforeText() {
                global $wgOut;
                $section = htmlspecialchars( $this->section );
                $wgOut->addHTML( <<<HTML
<input type='hidden' value="{$section}" name="wpSection" />
<input type='hidden' value="{$this->starttime}" name="wpStarttime" />
<input type='hidden' value="{$this->edittime}" name="wpEdittime" />
<input type='hidden' value="{$this->scrolltop}" name="wpScrolltop" id="wpScrolltop" />

HTML
                );
                if ( !$this->checkUnicodeCompliantBrowser() )
                        $wgOut->addHTML(Html::hidden( 'safemode', '1' ));
        }

        protected function showFormAfterText() {
                global $wgOut, $wgUser;
                /**
                 * 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.
                 */
                $wgOut->addHTML( "\n" . Html::hidden( "wpEditToken", $wgUser->editToken() ) . "\n" );
        }

        /**
         * Subpage overridable method for printing the form for page content editing
         * By default this simply outputs wpTextbox1
         * Subclasses can override this to provide a custom UI for editing;
         * be it a form, or simply wpTextbox1 with a modified content that will be
         * reverse modified when extracted from the post data.
         * Note that this is basically the inverse for importContentFormData
         */
        protected function showContentForm() {
                $this->showTextbox1();
        }

        /**
         * Method to output wpTextbox1
         * The $textoverride method can be used by subclasses overriding showContentForm
         * to pass back to this method.
         *
         * @param $customAttribs An array of html attributes to use in the textarea
         * @param $textoverride String: optional text to override $this->textarea1 with
         */
        protected function showTextbox1($customAttribs = null, $textoverride = null) {
                $classes = array(); // Textarea CSS
                if ( $this->mTitle->getNamespace() != NS_MEDIAWIKI && $this->mTitle->isProtected( 'edit' ) ) {
                        # Is the title semi-protected?
                        if ( $this->mTitle->isSemiProtected() ) {
                                $classes[] = 'mw-textarea-sprotected';
                        } else {
                                # Then it must be protected based on static groups (regular)
                                $classes[] = 'mw-textarea-protected';
                        }
                        # Is the title cascade-protected?
                        if ( $this->mTitle->isCascadeProtected() ) {
                                $classes[] = 'mw-textarea-cprotected';
                        }
                }
                $attribs = array( 'tabindex' => 1 );
                if ( is_array($customAttribs) )
                        $attribs += $customAttribs;

                if ( $this->wasDeletedSinceLastEdit() )
                        $attribs['type'] = 'hidden';
                if ( !empty( $classes ) ) {
                        if ( isset($attribs['class']) )
                                $classes[] = $attribs['class'];
                        $attribs['class'] = implode( ' ', $classes );
                }

                $this->showTextbox( isset($textoverride) ? $textoverride : $this->textbox1, 'wpTextbox1', $attribs );
        }

        protected function showTextbox2() {
                $this->showTextbox( $this->textbox2, 'wpTextbox2', array( 'tabindex' => 6, 'readonly' ) );
        }

        protected function showTextbox( $content, $name, $customAttribs = 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 = $customAttribs + array(
                        'accesskey' => ',',
                        'id'   => $name,
                        'cols' => $wgUser->getIntOption( 'cols' ),
                        'rows' => $wgUser->getIntOption( 'rows' ),
                        'style' => '' // avoid php notices when appending preferences (appending allows customAttribs['style'] to still work
                );

                $pageLang = $this->mTitle->getPageLanguage();
                $attribs['lang'] = $pageLang->getCode();
                $attribs['dir'] = $pageLang->getDir();

                $wgOut->addHTML( Html::textarea( $name, $wikitext, $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 $text String: 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();
                }
        }

        /**
         * Give a chance for site and per-namespace customizations of
         * terms of service summary link that might exist separately
         * from the copyright notice.
         *
         * This will display between the save button and the edit tools,
         * so should remain short!
         */
        protected function showTosSummary() {
                $msg = 'editpage-tos-summary';
                wfRunHooks( 'EditPageTosSummary', array( $this->mTitle, &$msg ) );
                if( !wfMessage( $msg )->isDisabled() ) {
                        global $wgOut;
                        $wgOut->addHTML( '<div class="mw-tos-summary">' );
                        $wgOut->addWikiMsg( $msg );
                        $wgOut->addHTML( '</div>' );
                }
        }

        protected function showEditTools() {
                global $wgOut;
                $wgOut->addHTML( '<div class="mw-editTools">' .
                        wfMessage( 'edittools' )->inContentLanguage()->parse() .
                        '</div>' );
        }

        protected function getCopywarn() {
                global $wgRightsText;
                if ( $wgRightsText ) {
                        $copywarnMsg = array( 'copyrightwarning',
                                '[[' . wfMsgForContent( 'copyrightpage' ) . ']]',
                                $wgRightsText );
                } else {
                        $copywarnMsg = array( 'copyrightwarning2',
                                '[[' . wfMsgForContent( 'copyrightpage' ) . ']]' );
                }
                // Allow for site and per-namespace customization of contribution/copyright notice.
                wfRunHooks( 'EditPageCopyrightWarning', array( $this->mTitle, &$copywarnMsg ) );

                return "<div id=\"editpage-copywarn\">\n" .
                        call_user_func_array("wfMsgNoTrans", $copywarnMsg) . "\n</div>";
        }

        protected function showStandardInputs( &$tabindex = 2 ) {
                global $wgOut;
                $wgOut->addHTML( "<div class='editOptions'>\n" );

                if ( $this->section != 'new' ) {
                        $this->showSummaryInput( false, $this->summary );
                        $wgOut->addHTML( $this->getSummaryPreview( false, $this->summary ) );
                }

                $checkboxes = $this->getCheckboxes( $tabindex,
                        array( 'minor' => $this->minoredit, 'watch' => $this->watchthis ) );
                $wgOut->addHTML( "<div class='editCheckboxes'>" . implode( $checkboxes, "\n" ) . "</div>\n" );
                $wgOut->addHTML( "<div class='editButtons'>\n" );
                $wgOut->addHTML( implode( $this->getEditButtons( $tabindex ), "\n" ) . "\n" );

                $cancel = $this->getCancelLink();
                if ( $cancel !== '' ) {
                        $cancel .= wfMsgExt( 'pipe-separator' , 'escapenoentities' );
                }
                $edithelpurl = Skin::makeInternalOrExternalUrl( wfMsgForContent( 'edithelppage' ) );
                $edithelp = '<a target="helpwindow" href="'.$edithelpurl.'">'.
                        htmlspecialchars( wfMsg( 'edithelp' ) ).'</a> '.
                        htmlspecialchars( wfMsg( 'newwindow' ) );
                $wgOut->addHTML( "      <span class='editHelp'>{$cancel}{$edithelp}</span>\n" );
                $wgOut->addHTML( "</div><!-- editButtons -->\n</div><!-- editOptions -->\n" );
        }

        /**
         * Show an edit conflict. textbox1 is already shown in showEditForm().
         * If you want to use another entry point to this function, be careful.
         */
        protected function showConflict() {
                global $wgOut;
                $this->textbox2 = $this->textbox1;
                $this->textbox1 = $this->getContent();
                if ( wfRunHooks( 'EditPageBeforeConflictDiff', array( &$this, &$wgOut ) ) ) {
                        $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourdiff" );

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

                        $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourtext" );
                        $this->showTextbox2();
                }
        }

        protected 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',
                                   'log_deleted',
                                   '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' )
                );
                // Quick paranoid permission checks...
                if( is_object( $data ) ) {
                        if( $data->log_deleted & LogPage::DELETED_USER )
                                $data->user_name = wfMsgHtml( 'rev-deleted-user' );
                        if( $data->log_deleted & LogPage::DELETED_COMMENT )
                                $data->log_comment = wfMsgHtml( 'rev-deleted-comment' );
                }
                return $data;
        }

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

                wfProfileIn( __METHOD__ );

                if ( $this->mTriedSave && !$this->mTokenOk ) {
                        if ( $this->mTokenOkExceptSuffix ) {
                                $note = wfMsg( 'token_suffix_mismatch' );
                        } else {
                                $note = wfMsg( 'session_fail_preview' );
                        }
                } elseif ( $this->incompleteForm ) {
                        $note = wfMsg( 'edit_form_incomplete' );
                } 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.
                        $parsedNote = '';
                        if ( $this->textbox1 !== '' ) {
                                // Do not put big scary notice, if previewing the empty
                                // string, which happens when you initially edit
                                // a category page, due to automatic preview-on-open.
                                $parsedNote = $wgOut->parse( "<div class='previewnote'>" .
                                        wfMsg( 'session_fail_preview_html' ) . "</div>" );
                        }
                        wfProfileOut( __METHOD__ );
                        return $parsedNote;
                }

                # don't parse user css/js, show message about preview
                # XXX: stupid php bug won't let us use $this->getContextTitle()->isCssJsSubpage() here -- This note has been there since r3530. Sure the bug was fixed time ago?

                if ( $this->isCssJsSubpage || $this->mTitle->isCssOrJsPage() ) {
                        $level = 'user';
                        if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
                                $level = 'site';
                        }

                        # Used messages to make sure grep find them:
                        # Messages: usercsspreview, userjspreview, sitecsspreview, sitejspreview
                        if (preg_match( "/\\.css$/", $this->mTitle->getText() ) ) {
                                $previewtext = "<div id='mw-{$level}csspreview'>\n" . wfMsg( "{$level}csspreview" ) . "\n</div>";
                                $class = "mw-code mw-css";
                        } elseif (preg_match( "/\\.js$/", $this->mTitle->getText() ) ) {
                                $previewtext = "<div id='mw-{$level}jspreview'>\n" . wfMsg( "{$level}jspreview" ) . "\n</div>";
                                $class = "mw-code mw-js";
                        } else {
                                throw new MWException( 'A CSS/JS (sub)page but which is not css nor js!' );
                        }

                        $parserOptions->setTidy( true );
                        $parserOutput = $wgParser->parse( $previewtext, $this->mTitle, $parserOptions );
                        $previewHTML = $parserOutput->mText;
                        $previewHTML .= "<pre class=\"$class\" dir=\"ltr\">\n" . htmlspecialchars( $this->textbox1 ) . "\n</pre>\n";
                } else {
                        $rt = Title::newFromRedirectArray( $this->textbox1 );
                        if ( $rt ) {
                                $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;
                                }

                                wfRunHooks( 'EditPageGetPreviewText', array( $this, &$toparse ) );

                                $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() );
                                }
                        }
                }

                if( $this->isConflict ) {
                        $conflict = '<h2 id="mw-previewconflict">' . htmlspecialchars( wfMsg( 'previewconflict' ) ) . "</h2>\n";
                } else {
                        $conflict = '<hr />';
                }

                $previewhead = "<div class='previewnote'>\n" .
                        '<h2 id="mw-previewheader">' . htmlspecialchars( wfMsg( 'preview' ) ) . "</h2>" .
                        $wgOut->parse( $note ) . $conflict . "</div>\n";

                $pageLang = $this->mTitle->getPageLanguage();
                $attribs = array( 'lang' => $pageLang->getCode(), 'dir' => $pageLang->getDir(),
                        'class' => 'mw-content-'.$pageLang->getDir() );
                $previewHTML = Html::rawElement( 'div', $attribs, $previewHTML );

                wfProfileOut( __METHOD__ );
                return $previewhead . $previewHTML . $this->previewTextAfterContent;
        }

        /**
         * @return Array
         */
        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;
                $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 ) {
                        $wgOut->addHTML( '<hr />' );
                        $wgOut->addWikiMsg( $first ? 'blockedoriginalsource' : 'blockededitsource', $this->mTitle->getPrefixedText() );
                        $this->showTextbox1( array( 'readonly' ), $source );
                }
        }

        /**
         * Produce the stock "please login to edit pages" page
         */
        function userNotLoggedInPage() {
                global $wgOut;

                $loginTitle = SpecialPage::getTitleFor( 'Userlogin' );
                $loginLink = Linker::linkKnown(
                        $loginTitle,
                        wfMsgHtml( 'loginreqlink' ),
                        array(),
                        array( 'returnto' => $this->getContextTitle()->getPrefixedText() )
                );

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

                $wgOut->addHTML( wfMessage( 'whitelistedittext' )->rawParams( $loginLink )->parse() );
                $wgOut->returnToMain( false, $this->getContextTitle() );
        }

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

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

                $res = wfMsgExt( 'nosuchsectiontext', 'parse', $this->section );
                wfRunHooks( 'EditPageNoSuchSection', array( &$this, &$res ) );
                $wgOut->addHTML( $res );

                $wgOut->returnToMain( false, $this->mTitle );
        }

        /**
         * Produce the stock "your edit contains spam" page
         *
         * @param $match Text which triggered one or more filters
         * @deprecated since 1.17 Use method spamPageWithContent() instead
         */
        static 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 );
        }

        /**
         * Show "your edit contains spam" page with your diff and text
         *
         * @param $match Text which triggered one or more filters
         */
        public function spamPageWithContent( $match = false ) {
                global $wgOut;
                $this->textbox2 = $this->textbox1;

                $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->wrapWikiMsg( '<h2>$1</h2>', "yourdiff" );
                $de = new DifferenceEngine( $this->mTitle );
                $de->setText( $this->getContent(), $this->textbox2 );
                $de->showDiff( wfMsg( "storedversion" ), wfMsg( "yourtext" ) );

                $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourtext" );
                $this->showTextbox2();

                $wgOut->addReturnTo( $this->getContextTitle(), array( 'action' => 'edit' ) );
        }


        /**
         * @private
         * @todo document
         *
         * @parma $editText string
         *
         * @return bool
         */
        function mergeChangesInto( &$editText ){
                wfProfileIn( __METHOD__ );

                $db = wfGetDB( DB_MASTER );

                // This is the revision the editor started from
                $baseRevision = $this->getBaseRevision();
                if ( is_null( $baseRevision ) ) {
                        wfProfileOut( __METHOD__ );
                        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( __METHOD__ );
                        return false;
                }
                $currentText = $currentRevision->getText();

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

        /**
         * Format an anchor fragment as it would appear for a given section name
         * @param $text String
         * @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, $wgOut;
                global $wgUseTeX, $wgEnableUploads, $wgForeignFileRepos;

                $imagesAvailable = $wgEnableUploads || count( $wgForeignFileRepos );

                /**
                 * $toolarray is an array of arrays each of which includes the
                 * filename of the button image (without path), the opening
                 * tag, the closing tag, optionally a sample text that is
                 * inserted between the two when no selection is highlighted
                 * and.  The tip text is shown when the user moves the mouse
                 * over the button.
                 *
                 * Also here: 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'
                        ),
                        $imagesAvailable ? 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',
                        ) : false,
                        $imagesAvailable ? 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'
                        ) : false,
                        $wgUseTeX ?     array(
                                'image'  => $wgLang->getImageFile( 'button-math' ),
                                'id'     => 'mw-editbutton-math',
                                'open'   => "<math>",
                                'close'  => "</math>",
                                'sample' => wfMsg( 'math_sample' ),
                                'tip'    => wfMsg( 'math_tip' ),
                                'key'    => 'C'
                        ) : false,
                        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";

                $script = '';
                foreach ( $toolarray as $tool ) {
                        if ( !$tool ) {
                                continue;
                        }

                        $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 ) );
                        $script .= "mw.toolbar.addButton($paramList);\n";
                }
                $wgOut->addScript( Html::inlineScript(
                        "if ( window.mediaWiki ) {{$script}}"
                ) );

                $toolbar .= "\n</div>";

                wfRunHooks( 'EditPageBeforeEditToolbar', array( &$toolbar ) );

                return $toolbar;
        }

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

                $checkboxes = array();

                // don't show the minor edit checkbox if it's a new page or section
                if ( !$this->isNew ) {
                        $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'], $attribs ) .
                                        "&#160;<label for='wpMinoredit' id='mw-editpage-minoredit'" .
                                        Xml::expandAttributes( array( 'title' => Linker::titleAttrib( 'minoredit', 'withaccess' ) ) ) .
                                        ">{$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'], $attribs ) .
                                "&#160;<label for='wpWatchthis' id='mw-editpage-watch'" .
                                Xml::expandAttributes( array( 'title' => Linker::titleAttrib( 'watch', 'withaccess' ) ) ) .
                                ">{$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 ) {
                $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
                $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;
        }

        /**
         * @return string
         */
        public function getCancelLink() {
                $cancelParams = array();
                if ( !$this->isConflict && $this->mArticle->getOldID() > 0 ) {
                        $cancelParams['oldid'] = $this->mArticle->getOldID();
                }

                return Linker::linkKnown(
                        $this->getContextTitle(),
                        wfMsgExt( 'cancel', array( 'parseinline' ) ),
                        array( 'id' => 'mw-editform-cancel' ),
                        $cancelParams
                );
        }

        /**
         * 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 );

                wfRunHooks( 'EditPageGetDiffText', array( $this, &$newtext ) );

                $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 $request WebRequest
         * @param $field String
         * @return String
         * @private
         */
        function safeUnicodeInput( $request, $field ) {
                $text = rtrim( $request->getText( $field ) );
                return $request->getBool( 'safemode' )
                        ? $this->unmakesafe( $text )
                        : $text;
        }

        /**
         * @param $request WebRequest
         * @param $text string
         * @return string
         */
        function safeUnicodeText( $request, $text ) {
                $text = rtrim( $text );
                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 $text String
         * @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 $invalue String
         * @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 $invalue String
         * @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' );
        }

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

                $resultDetails = false;
                # Allow bots to exempt some edits from bot flagging
                $bot = $wgUser->isAllowed( 'bot' ) && $this->bot;
                $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:
                                return false;

                        case self::AS_SUCCESS_NEW_ARTICLE:
                                $query = $resultDetails['redirect'] ? 'redirect=no' : '';
                                $wgOut->redirect( $this->mTitle->getFullURL( $query ) );
                                return false;

                        case self::AS_SUCCESS_UPDATE:
                                $extraQuery = '';
                                $sectionanchor = $resultDetails['sectionanchor'];

                                // Give extensions a chance to modify URL query on update
                                wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this->mArticle, &$sectionanchor, &$extraQuery ) );

                                if ( $resultDetails['redirect'] ) {
                                        if ( $extraQuery == '' ) {
                                                $extraQuery = 'redirect=no';
                                        } else {
                                                $extraQuery = 'redirect=no&' . $extraQuery;
                                        }
                                }
                                $wgOut->redirect( $this->mTitle->getFullURL( $extraQuery ) . $sectionanchor );
                                return false;

                        case self::AS_SPAM_ERROR:
                                $this->spamPageWithContent( $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 false;

                        case self::AS_BLANK_ARTICLE:
                                $wgOut->redirect( $this->getContextTitle()->getFullURL() );
                                return false;

                        case self::AS_IMAGE_REDIRECT_LOGGED:
                                $wgOut->permissionRequired( 'upload' );
                                return false;
                }
        }

        /**
         * @return Revision
         */
        function getBaseRevision() {
                if ( !$this->mBaseRevision ) {
                        $db = wfGetDB( DB_MASTER );
                        $baseRevision = Revision::loadFromTimestamp(
                                $db, $this->mTitle, $this->edittime );
                        return $this->mBaseRevision = $baseRevision;
                } else {
                        return $this->mBaseRevision;
                }
        }
}