EditPage.php

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<?php
use MediaWiki\EditPage\TextboxBuilder;
use MediaWiki\EditPage\TextConflictHelper;
use MediaWiki\Logger\LoggerFactory;
use MediaWiki\MediaWikiServices;
use Wikimedia\ScopedCallback;
 
class EditPage {
    const UNICODE_CHECK = 'ℳ𝒲♥𝓊𝓃𝒾𝒸ℴ𝒹ℯ';
 
    const AS_SUCCESS_UPDATE = 200;
 
    const AS_SUCCESS_NEW_ARTICLE = 201;
 
    const AS_HOOK_ERROR = 210;
 
    const AS_HOOK_ERROR_EXPECTED = 212;
 
    const AS_BLOCKED_PAGE_FOR_USER = 215;
 
    const AS_CONTENT_TOO_BIG = 216;
 
    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_END = 231;
 
    const AS_SPAM_ERROR = 232;
 
    const AS_IMAGE_REDIRECT_ANON = 233;
 
    const AS_IMAGE_REDIRECT_LOGGED = 234;
 
    const AS_NO_CHANGE_CONTENT_MODEL = 235;
 
    const AS_SELF_REDIRECT = 236;
 
    const AS_CHANGE_TAG_ERROR = 237;
 
    const AS_PARSE_ERROR = 240;
 
    const AS_CANNOT_USE_CUSTOM_MODEL = 241;
 
    const AS_UNICODE_NOT_SUPPORTED = 242;
 
    const EDITFORM_ID = 'editform';
 
    const POST_EDIT_COOKIE_KEY_PREFIX = 'PostEditRevision';
 
    const POST_EDIT_COOKIE_DURATION = 1200;
 
    public $mArticle;
    private $page;
 
    public $mTitle;
 
    private $mContextTitle = null;
 
    public $action = 'submit';
 
    public $isConflict = false;
 
    public $isNew = false;
 
    public $deletedSinceEdit;
 
    public $formtype;
 
    public $firsttime;
 
    public $lastDelete;
 
    public $mTokenOk = false;
 
    public $mTokenOkExceptSuffix = false;
 
    public $mTriedSave = false;
 
    public $incompleteForm = false;
 
    public $tooBig = false;
 
    public $missingComment = false;
 
    public $missingSummary = false;
 
    public $allowBlankSummary = false;
 
    protected $blankArticle = false;
 
    protected $allowBlankArticle = false;
 
    protected $selfRedirect = false;
 
    protected $allowSelfRedirect = false;
 
    public $autoSumm = '';
 
    public $hookError = '';
 
    public $mParserOutput;
 
    public $hasPresetSummary = false;
 
    public $mBaseRevision = false;
 
    public $mShowSummaryField = true;
 
    # Form values
 
    public $save = false;
 
    public $preview = false;
 
    public $diff = false;
 
    public $minoredit = false;
 
    public $watchthis = false;
 
    public $recreate = false;
 
    public $textbox1 = '';
 
    public $textbox2 = '';
 
    public $summary = '';
 
    public $nosummary = false;
 
    public $edittime = '';
 
    private $editRevId = null;
 
    public $section = '';
 
    public $sectiontitle = '';
 
    public $starttime = '';
 
    public $oldid = 0;
 
    public $parentRevId = 0;
 
    public $editintro = '';
 
    public $scrolltop = null;
 
    public $bot = true;
 
    public $contentModel;
 
    public $contentFormat = null;
 
    private $changeTags = null;
 
    # Placeholders for text injection by hooks (must be HTML)
    # extensions should take care to _append_ to the present value
 
    public $editFormPageTop = '';
    public $editFormTextTop = '';
    public $editFormTextBeforeContent = '';
    public $editFormTextAfterWarn = '';
    public $editFormTextAfterTools = '';
    public $editFormTextBottom = '';
    public $editFormTextAfterContent = '';
    public $previewTextAfterContent = '';
    public $mPreloadContent = null;
 
    /* $didSave should be set to true whenever an article was successfully altered. */
    public $didSave = false;
    public $undidRev = 0;
 
    public $suppressIntro = false;
 
    protected $edit;
 
    protected $contentLength = false;
 
    private $enableApiEditOverride = false;
 
    protected $context;
 
    private $isOldRev = false;
 
    private $unicodeCheck;
 
    private $editConflictHelperFactory;
 
    private $editConflictHelper;
 
    public function __construct( Article $article ) {
        $this->mArticle = $article;
        $this->page = $article->getPage(); // model object
        $this->mTitle = $article->getTitle();
 
        // Make sure the local context is in sync with other member variables.
        // Particularly make sure everything is using the same WikiPage instance.
        // This should probably be the case in Article as well, but it's
        // particularly important for EditPage, to make use of the in-place caching
        // facility in WikiPage::prepareContentForEdit.
        $this->context = new DerivativeContext( $article->getContext() );
        $this->context->setWikiPage( $this->page );
        $this->context->setTitle( $this->mTitle );
 
        $this->contentModel = $this->mTitle->getContentModel();
 
        $handler = ContentHandler::getForModelID( $this->contentModel );
        $this->contentFormat = $handler->getDefaultFormat();
        $this->editConflictHelperFactory = [ $this, 'newTextConflictHelper' ];
    }
 
    public function getArticle() {
        return $this->mArticle;
    }
 
    public function getContext() {
        return $this->context;
    }
 
    public function getTitle() {
        return $this->mTitle;
    }
 
    public function setContextTitle( $title ) {
        $this->mContextTitle = $title;
    }
 
    public function getContextTitle() {
        if ( is_null( $this->mContextTitle ) ) {
            wfDeprecated( __METHOD__ . ' called with no title set', '1.32' );
            global $wgTitle;
            return $wgTitle;
        } else {
            return $this->mContextTitle;
        }
    }
 
    public function isSupportedContentModel( $modelId ) {
        return $this->enableApiEditOverride === true ||
            ContentHandler::getForModelID( $modelId )->supportsDirectEditing();
    }
 
    public function setApiEditOverride( $enableOverride ) {
        $this->enableApiEditOverride = $enableOverride;
    }
 
    public function submit() {
        wfDeprecated( __METHOD__, '1.29' );
        $this->edit();
    }
 
    public function edit() {
        // Allow extensions to modify/prevent this form or submission
        if ( !Hooks::run( 'AlternateEdit', [ $this ] ) ) {
            return;
        }
 
        wfDebug( __METHOD__ . ": enter\n" );
 
        $request = $this->context->getRequest();
        // If they used redlink=1 and the page exists, redirect to the main article
        if ( $request->getBool( 'redlink' ) && $this->mTitle->exists() ) {
            $this->context->getOutput()->redirect( $this->mTitle->getFullURL() );
            return;
        }
 
        $this->importFormData( $request );
        $this->firsttime = false;
 
        if ( wfReadOnly() && $this->save ) {
            // Force preview
            $this->save = false;
            $this->preview = true;
        }
 
        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';
            }
        }
 
        $permErrors = $this->getEditPermissionErrors( $this->save ? 'secure' : 'full' );
        if ( $permErrors ) {
            wfDebug( __METHOD__ . ": User can't edit\n" );
 
            if ( $this->context->getUser()->getBlock() ) {
                // track block with a cookie if it doesn't exists already
                $this->context->getUser()->trackBlockWithCookie();
 
                // Auto-block user's IP if the account was "hard" blocked
                if ( !wfReadOnly() ) {
                    DeferredUpdates::addCallableUpdate( function () {
                        $this->context->getUser()->spreadAnyEditBlock();
                    } );
                }
            }
            $this->displayPermissionsError( $permErrors );
 
            return;
        }
 
        $revision = $this->mArticle->getRevisionFetched();
        // Disallow editing revisions with content models different from the current one
        // Undo edits being an exception in order to allow reverting content model changes.
        if ( $revision
            && $revision->getContentModel() !== $this->contentModel
        ) {
            $prevRev = null;
            if ( $this->undidRev ) {
                $undidRevObj = Revision::newFromId( $this->undidRev );
                $prevRev = $undidRevObj ? $undidRevObj->getPrevious() : null;
            }
            if ( !$this->undidRev
                || !$prevRev
                || $prevRev->getContentModel() !== $this->contentModel
            ) {
                $this->displayViewSourcePage(
                    $this->getContentObject(),
                    $this->context->msg(
                        'contentmodelediterror',
                        $revision->getContentModel(),
                        $this->contentModel
                    )->plain()
                );
                return;
            }
        }
 
        $this->isConflict = false;
 
        # Show applicable editing introductions
        if ( $this->formtype == 'initial' || $this->firsttime ) {
            $this->showIntro();
        }
 
        # 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 ( $this->formtype == 'save' ) {
            $resultDetails = null;
            $status = $this->attemptSave( $resultDetails );
            if ( !$this->handleStatus( $status, $resultDetails ) ) {
                return;
            }
        }
 
        # First time through: get contents, set time for conflict
        # checking, etc.
        if ( $this->formtype == 'initial' || $this->firsttime ) {
            if ( $this->initialiseForm() === false ) {
                $out = $this->context->getOutput();
                if ( $out->getRedirect() === '' ) { // mcrundo hack redirects, don't override it
                    $this->noSuchSectionPage();
                }
                return;
            }
 
            if ( !$this->mTitle->getArticleID() ) {
                Hooks::run( 'EditFormPreloadText', [ &$this->textbox1, &$this->mTitle ] );
            } else {
                Hooks::run( 'EditFormInitialText', [ $this ] );
            }
 
        }
 
        $this->showEditForm();
    }
 
    protected function getEditPermissionErrors( $rigor = 'secure' ) {
        $user = $this->context->getUser();
        $permErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user, $rigor );
        # Can this title be created?
        if ( !$this->mTitle->exists() ) {
            $permErrors = array_merge(
                $permErrors,
                wfArrayDiff2(
                    $this->mTitle->getUserPermissionsErrors( 'create', $user, $rigor ),
                    $permErrors
                )
            );
        }
        # Ignore some permissions errors when a user is just previewing/viewing diffs
        $remove = [];
        foreach ( $permErrors as $error ) {
            if ( ( $this->preview || $this->diff )
                && (
                    $error[0] == 'blockedtext' ||
                    $error[0] == 'autoblockedtext' ||
                    $error[0] == 'systemblockedtext'
                )
            ) {
                $remove[] = $error;
            }
        }
        $permErrors = wfArrayDiff2( $permErrors, $remove );
 
        return $permErrors;
    }
 
    protected function displayPermissionsError( array $permErrors ) {
        $out = $this->context->getOutput();
        if ( $this->context->getRequest()->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.
            $out->redirect( $this->mTitle->getFullURL() );
            return;
        }
 
        $content = $this->getContentObject();
 
        # Use the normal message if there's nothing to display
        if ( $this->firsttime && ( !$content || $content->isEmpty() ) ) {
            $action = $this->mTitle->exists() ? 'edit' :
                ( $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage' );
            throw new PermissionsError( $action, $permErrors );
        }
 
        $this->displayViewSourcePage(
            $content,
            $out->formatPermissionsErrorMessage( $permErrors, 'edit' )
        );
    }
 
    protected function displayViewSourcePage( Content $content, $errorMessage = '' ) {
        $out = $this->context->getOutput();
        Hooks::run( 'EditPage::showReadOnlyForm:initial', [ $this, &$out ] );
 
        $out->setRobotPolicy( 'noindex,nofollow' );
        $out->setPageTitle( $this->context->msg(
            'viewsource-title',
            $this->getContextTitle()->getPrefixedText()
        ) );
        $out->addBacklinkSubtitle( $this->getContextTitle() );
        $out->addHTML( $this->editFormPageTop );
        $out->addHTML( $this->editFormTextTop );
 
        if ( $errorMessage !== '' ) {
            $out->addWikiTextAsInterface( $errorMessage );
            $out->addHTML( "<hr />\n" );
        }
 
        # If the user made changes, preserve them when showing the markup
        # (This happens when a user is blocked during edit, for instance)
        if ( !$this->firsttime ) {
            $text = $this->textbox1;
            $out->addWikiMsg( 'viewyourtext' );
        } else {
            try {
                $text = $this->toEditText( $content );
            } catch ( MWException $e ) {
                # Serialize using the default format if the content model is not supported
                # (e.g. for an old revision with a different model)
                $text = $content->serialize();
            }
            $out->addWikiMsg( 'viewsourcetext' );
        }
 
        $out->addHTML( $this->editFormTextBeforeContent );
        $this->showTextbox( $text, 'wpTextbox1', [ 'readonly' ] );
        $out->addHTML( $this->editFormTextAfterContent );
 
        $out->addHTML( $this->makeTemplatesOnThisPageList( $this->getTemplates() ) );
 
        $out->addModules( 'mediawiki.action.edit.collapsibleFooter' );
 
        $out->addHTML( $this->editFormTextBottom );
        if ( $this->mTitle->exists() ) {
            $out->returnToMain( null, $this->mTitle );
        }
    }
 
    protected function previewOnOpen() {
        $config = $this->context->getConfig();
        $previewOnOpenNamespaces = $config->get( 'PreviewOnOpenNamespaces' );
        $request = $this->context->getRequest();
        if ( $config->get( 'RawHtml' ) ) {
            // If raw HTML is enabled, disable preview on open
            // since it has to be posted with a token for
            // security reasons
            return false;
        }
        if ( $request->getVal( 'preview' ) == 'yes' ) {
            // Explicit override from request
            return true;
        } elseif ( $request->getVal( 'preview' ) == 'no' ) {
            // Explicit override from request
            return false;
        } elseif ( $this->section == 'new' ) {
            // Nothing *to* preview for new sections
            return false;
        } elseif ( ( $request->getCheck( 'preload' ) || $this->mTitle->exists() )
            && $this->context->getUser()->getOption( 'previewonfirst' )
        ) {
            // Standard preference behavior
            return true;
        } elseif ( !$this->mTitle->exists()
            && isset( $previewOnOpenNamespaces[$this->mTitle->getNamespace()] )
            && $previewOnOpenNamespaces[$this->mTitle->getNamespace()]
        ) {
            // Categories are special
            return true;
        } else {
            return false;
        }
    }
 
    protected function isWrongCaseUserConfigPage() {
        if ( $this->mTitle->isUserConfigPage() ) {
            $name = $this->mTitle->getSkinFromConfigSubpage();
            $skins = array_merge(
                array_keys( Skin::getSkinNames() ),
                [ 'common' ]
            );
            return !in_array( $name, $skins )
                && in_array( strtolower( $name ), $skins );
        } else {
            return false;
        }
    }
 
    protected function isSectionEditSupported() {
        $contentHandler = ContentHandler::getForTitle( $this->mTitle );
        return $contentHandler->supportsSections();
    }
 
    public function importFormData( &$request ) {
        # Section edit can come from either the form or a link
        $this->section = $request->getVal( 'wpSection', $request->getVal( 'section' ) );
 
        if ( $this->section !== null && $this->section !== '' && !$this->isSectionEditSupported() ) {
            throw new ErrorPageError( 'sectioneditnotsupported-title', 'sectioneditnotsupported-text' );
        }
 
        $this->isNew = !$this->mTitle->exists() || $this->section == 'new';
 
        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 = rtrim( $request->getText( 'wpTextbox1' ) );
            if ( !$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
                $textbox1 = $this->importContentFormData( $request );
                if ( $textbox1 !== null ) {
                    $this->textbox1 = $textbox1;
                }
            }
 
            $this->unicodeCheck = $request->getText( 'wpUnicodeCheck' );
 
            $this->summary = $request->getText( 'wpSummary' );
 
            # If the summary consists of a heading, e.g. '==Foobar==', extract the title from the
            # header syntax, e.g. 'Foobar'. This is mainly an issue when we are using wpSummary for
            # section titles.
            $this->summary = preg_replace( '/^\s*=+\s*(.*?)\s*=+\s*$/', '$1', $this->summary );
 
            # Treat sectiontitle the same way as summary.
            # Note that wpSectionTitle is not yet a part of the actual edit form, as wpSummary is
            # currently doing double duty as both edit summary and section title. Right now this
            # is just to allow API edits to work around this limitation, but this should be
            # incorporated into the actual edit form when EditPage is rewritten (T20654, T28312).
            $this->sectiontitle = $request->getText( 'wpSectionTitle' );
            $this->sectiontitle = preg_replace( '/^\s*=+\s*(.*?)\s*=+\s*$/', '$1', $this->sectiontitle );
 
            $this->edittime = $request->getVal( 'wpEdittime' );
            $this->editRevId = $request->getIntOrNull( 'editRevId' );
            $this->starttime = $request->getVal( 'wpStarttime' );
 
            $undidRev = $request->getInt( 'wpUndidRevision' );
            if ( $undidRev ) {
                $this->undidRev = $undidRev;
            }
 
            $this->scrolltop = $request->getIntOrNull( 'wpScrolltop' );
 
            if ( $this->textbox1 === '' && !$request->getCheck( 'wpTextbox1' ) ) {
                // 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 {
                // If we receive the last parameter of the request, we can fairly
                // claim the POST request has not been truncated.
                $this->incompleteForm = !$request->getVal( 'wpUltimateParam' );
            }
            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( $request->getPostValues(), true ) . "\n" );
                $this->preview = true;
            } else {
                $this->preview = $request->getCheck( 'wpPreview' );
                $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' );
 
            $user = $this->context->getUser();
            # 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() == $user->getName()
            ) {
                $this->allowBlankSummary = true;
            } else {
                $this->allowBlankSummary = $request->getBool( 'wpIgnoreBlankSummary' )
                    || !$user->getOption( 'forceeditsummary' );
            }
 
            $this->autoSumm = $request->getText( 'wpAutoSummary' );
 
            $this->allowBlankArticle = $request->getBool( 'wpIgnoreBlankArticle' );
            $this->allowSelfRedirect = $request->getBool( 'wpIgnoreSelfRedirect' );
 
            $changeTags = $request->getVal( 'wpChangeTags' );
            if ( is_null( $changeTags ) || $changeTags === '' ) {
                $this->changeTags = [];
            } else {
                $this->changeTags = array_filter( array_map( 'trim', explode( ',',
                    $changeTags ) ) );
            }
        } else {
            # Not a posted form? Start with nothing.
            wfDebug( __METHOD__ . ": Not a posted form.\n" );
            $this->textbox1 = '';
            $this->summary = '';
            $this->sectiontitle = '';
            $this->edittime = '';
            $this->editRevId = null;
            $this->starttime = wfTimestampNow();
            $this->edit = false;
            $this->preview = false;
            $this->save = false;
            $this->diff = false;
            $this->minoredit = false;
            // Watch may be overridden by request parameters
            $this->watchthis = $request->getBool( 'watchthis', false );
            $this->recreate = false;
 
            // When creating a new section, we can preload a section title by passing it as the
            // preloadtitle parameter in the URL (T15100)
            if ( $this->section == 'new' && $request->getVal( 'preloadtitle' ) ) {
                $this->sectiontitle = $request->getVal( 'preloadtitle' );
                // Once wpSummary isn't being use for setting section titles, we should delete this.
                $this->summary = $request->getVal( 'preloadtitle' );
            } elseif ( $this->section != 'new' && $request->getVal( 'summary' ) !== '' ) {
                $this->summary = $request->getText( 'summary' );
                if ( $this->summary !== '' ) {
                    $this->hasPresetSummary = true;
                }
            }
 
            if ( $request->getVal( 'minor' ) ) {
                $this->minoredit = true;
            }
        }
 
        $this->oldid = $request->getInt( 'oldid' );
        $this->parentRevId = $request->getInt( 'parentRevId' );
 
        $this->bot = $request->getBool( 'bot', true );
        $this->nosummary = $request->getBool( 'nosummary' );
 
        // May be overridden by revision.
        $this->contentModel = $request->getText( 'model', $this->contentModel );
        // May be overridden by revision.
        $this->contentFormat = $request->getText( 'format', $this->contentFormat );
 
        try {
            $handler = ContentHandler::getForModelID( $this->contentModel );
        } catch ( MWUnknownContentModelException $e ) {
            throw new ErrorPageError(
                'editpage-invalidcontentmodel-title',
                'editpage-invalidcontentmodel-text',
                [ wfEscapeWikiText( $this->contentModel ) ]
            );
        }
 
        if ( !$handler->isSupportedFormat( $this->contentFormat ) ) {
            throw new ErrorPageError(
                'editpage-notsupportedcontentformat-title',
                'editpage-notsupportedcontentformat-text',
                [
                    wfEscapeWikiText( $this->contentFormat ),
                    wfEscapeWikiText( ContentHandler::getLocalizedName( $this->contentModel ) )
                ]
            );
        }
 
        $this->editintro = $request->getText( 'editintro',
            // Custom edit intro for new sections
            $this->section === 'new' ? 'MediaWiki:addsection-editintro' : '' );
 
        // Allow extensions to modify form data
        Hooks::run( 'EditPage::importFormData', [ $this, $request ] );
    }
 
    protected function importContentFormData( &$request ) {
        return; // Don't do anything, EditPage already extracted wpTextbox1
    }
 
    public function initialiseForm() {
        $this->edittime = $this->page->getTimestamp();
        $this->editRevId = $this->page->getLatest();
 
        $content = $this->getContentObject( false ); # TODO: track content object?!
        if ( $content === false ) {
            return false;
        }
        $this->textbox1 = $this->toEditText( $content );
 
        $user = $this->context->getUser();
        // activate checkboxes if user wants them to be always active
        # Sort out the "watch" checkbox
        if ( $user->getOption( 'watchdefault' ) ) {
            # Watch all edits
            $this->watchthis = true;
        } elseif ( $user->getOption( 'watchcreations' ) && !$this->mTitle->exists() ) {
            # Watch creations
            $this->watchthis = true;
        } elseif ( $user->isWatched( $this->mTitle ) ) {
            # Already watched
            $this->watchthis = true;
        }
        if ( $user->getOption( 'minordefault' ) && !$this->isNew ) {
            $this->minoredit = true;
        }
        if ( $this->textbox1 === false ) {
            return false;
        }
        return true;
    }
 
    protected function getContentObject( $def_content = null ) {
        $content = false;
 
        $user = $this->context->getUser();
        $request = $this->context->getRequest();
        // For message page not locally set, use the i18n message.
        // For other non-existent articles, use preload text if any.
        if ( !$this->mTitle->exists() || $this->section == 'new' ) {
            if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI && $this->section != 'new' ) {
                # If this is a system message, get the default text.
                $msg = $this->mTitle->getDefaultMessageText();
 
                $content = $this->toEditContent( $msg );
            }
            if ( $content === false ) {
                # If requested, preload some text.
                $preload = $request->getVal( 'preload',
                    // Custom preload text for new sections
                    $this->section === 'new' ? 'MediaWiki:addsection-preload' : '' );
                $params = $request->getArray( 'preloadparams', [] );
 
                $content = $this->getPreloadedContent( $preload, $params );
            }
        // For existing pages, get text based on "undo" or section parameters.
        } elseif ( $this->section != '' ) {
            // Get section edit text (returns $def_text for invalid sections)
            $orig = $this->getOriginalContent( $user );
            $content = $orig ? $orig->getSection( $this->section ) : null;
 
            if ( !$content ) {
                $content = $def_content;
            }
        } else {
            $undoafter = $request->getInt( 'undoafter' );
            $undo = $request->getInt( 'undo' );
 
            if ( $undo > 0 && $undoafter > 0 ) {
                $undorev = Revision::newFromId( $undo );
                $oldrev = Revision::newFromId( $undoafter );
                $undoMsg = null;
 
                # Sanity check, make sure it's the right page,
                # the revisions exist and they were not deleted.
                # Otherwise, $content will be left as-is.
                if ( !is_null( $undorev ) && !is_null( $oldrev ) &&
                    !$undorev->isDeleted( Revision::DELETED_TEXT ) &&
                    !$oldrev->isDeleted( Revision::DELETED_TEXT )
                ) {
                    if ( WikiPage::hasDifferencesOutsideMainSlot( $undorev, $oldrev )
                        || !$this->isSupportedContentModel( $oldrev->getContentModel() )
                    ) {
                        // Hack for undo while EditPage can't handle multi-slot editing
                        $this->context->getOutput()->redirect( $this->mTitle->getFullURL( [
                            'action' => 'mcrundo',
                            'undo' => $undo,
                            'undoafter' => $undoafter,
                        ] ) );
                        return false;
                    } else {
                        $content = $this->page->getUndoContent( $undorev, $oldrev );
 
                        if ( $content === false ) {
                            # Warn the user that something went wrong
                            $undoMsg = 'failure';
                        }
                    }
 
                    if ( $undoMsg === null ) {
                        $oldContent = $this->page->getContent( Revision::RAW );
                        $popts = ParserOptions::newFromUserAndLang(
                            $user, MediaWikiServices::getInstance()->getContentLanguage() );
                        $newContent = $content->preSaveTransform( $this->mTitle, $user, $popts );
                        if ( $newContent->getModel() !== $oldContent->getModel() ) {
                            // The undo may change content
                            // model if its reverting the top
                            // edit. This can result in
                            // mismatched content model/format.
                            $this->contentModel = $newContent->getModel();
                            $this->contentFormat = $oldrev->getContentFormat();
                        }
 
                        if ( $newContent->equals( $oldContent ) ) {
                            # Tell the user that the undo results in no change,
                            # i.e. the revisions were already undone.
                            $undoMsg = 'nochange';
                            $content = false;
                        } else {
                            # Inform the user of our success and set an automatic edit summary
                            $undoMsg = 'success';
 
                            # If we just undid one rev, use an autosummary
                            $firstrev = $oldrev->getNext();
                            if ( $firstrev && $firstrev->getId() == $undo ) {
                                $userText = $undorev->getUserText();
                                if ( $userText === '' ) {
                                    $undoSummary = $this->context->msg(
                                        'undo-summary-username-hidden',
                                        $undo
                                    )->inContentLanguage()->text();
                                } else {
                                    $undoSummary = $this->context->msg(
                                        'undo-summary',
                                        $undo,
                                        $userText
                                    )->inContentLanguage()->text();
                                }
                                if ( $this->summary === '' ) {
                                    $this->summary = $undoSummary;
                                } else {
                                    $this->summary = $undoSummary . $this->context->msg( 'colon-separator' )
                                        ->inContentLanguage()->text() . $this->summary;
                                }
                                $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.
                    $undoMsg = 'norev';
                }
 
                $out = $this->context->getOutput();
                // Messages: undo-success, undo-failure, undo-main-slot-only, undo-norev,
                // undo-nochange.
                $class = ( $undoMsg == 'success' ? '' : 'error ' ) . "mw-undo-{$undoMsg}";
                $this->editFormPageTop .= Html::rawElement(
                    'div', [ 'class' => $class ],
                    $out->parseAsInterface(
                        $this->context->msg( 'undo-' . $undoMsg )->plain()
                    )
                );
            }
 
            if ( $content === false ) {
                // Hack for restoring old revisions while EditPage
                // can't handle multi-slot editing.
 
                $curRevision = $this->page->getRevision();
                $oldRevision = $this->mArticle->getRevisionFetched();
 
                if ( $curRevision
                    && $oldRevision
                    && $curRevision->getId() !== $oldRevision->getId()
                    && ( WikiPage::hasDifferencesOutsideMainSlot( $oldRevision, $curRevision )
                        || !$this->isSupportedContentModel( $oldRevision->getContentModel() ) )
                ) {
                    $this->context->getOutput()->redirect(
                        $this->mTitle->getFullURL(
                            [
                                'action' => 'mcrrestore',
                                'restore' => $oldRevision->getId(),
                            ]
                        )
                    );
 
                    return false;
                }
            }
 
            if ( $content === false ) {
                $content = $this->getOriginalContent( $user );
            }
        }
 
        return $content;
    }
 
    private function getOriginalContent( User $user ) {
        if ( $this->section == 'new' ) {
            return $this->getCurrentContent();
        }
        $revision = $this->mArticle->getRevisionFetched();
        if ( $revision === null ) {
            $handler = ContentHandler::getForModelID( $this->contentModel );
            return $handler->makeEmptyContent();
        }
        $content = $revision->getContent( Revision::FOR_THIS_USER, $user );
        return $content;
    }
 
    public function getParentRevId() {
        if ( $this->parentRevId ) {
            return $this->parentRevId;
        } else {
            return $this->mArticle->getRevIdFetched();
        }
    }
 
    protected function getCurrentContent() {
        $rev = $this->page->getRevision();
        $content = $rev ? $rev->getContent( Revision::RAW ) : null;
 
        if ( $content === false || $content === null ) {
            $handler = ContentHandler::getForModelID( $this->contentModel );
            return $handler->makeEmptyContent();
        } elseif ( !$this->undidRev ) {
            // Content models should always be the same since we error
            // out if they are different before this point (in ->edit()).
            // The exception being, during an undo, the current revision might
            // differ from the prior revision.
            $logger = LoggerFactory::getInstance( 'editpage' );
            if ( $this->contentModel !== $rev->getContentModel() ) {
                $logger->warning( "Overriding content model from current edit {prev} to {new}", [
                    'prev' => $this->contentModel,
                    'new' => $rev->getContentModel(),
                    'title' => $this->getTitle()->getPrefixedDBkey(),
                    'method' => __METHOD__
                ] );
                $this->contentModel = $rev->getContentModel();
            }
 
            // Given that the content models should match, the current selected
            // format should be supported.
            if ( !$content->isSupportedFormat( $this->contentFormat ) ) {
                $logger->warning( "Current revision content format unsupported. Overriding {prev} to {new}", [
 
                    'prev' => $this->contentFormat,
                    'new' => $rev->getContentFormat(),
                    'title' => $this->getTitle()->getPrefixedDBkey(),
                    'method' => __METHOD__
                ] );
                $this->contentFormat = $rev->getContentFormat();
            }
        }
        return $content;
    }
 
    public function setPreloadedContent( Content $content ) {
        $this->mPreloadContent = $content;
    }
 
    protected function getPreloadedContent( $preload, $params = [] ) {
        if ( !empty( $this->mPreloadContent ) ) {
            return $this->mPreloadContent;
        }
 
        $handler = ContentHandler::getForModelID( $this->contentModel );
 
        if ( $preload === '' ) {
            return $handler->makeEmptyContent();
        }
 
        $user = $this->context->getUser();
        $title = Title::newFromText( $preload );
        # Check for existence to avoid getting MediaWiki:Noarticletext
        if ( $title === null || !$title->exists() || !$title->userCan( 'read', $user ) ) {
            // TODO: somehow show a warning to the user!
            return $handler->makeEmptyContent();
        }
 
        $page = WikiPage::factory( $title );
        if ( $page->isRedirect() ) {
            $title = $page->getRedirectTarget();
            # Same as before
            if ( $title === null || !$title->exists() || !$title->userCan( 'read', $user ) ) {
                // TODO: somehow show a warning to the user!
                return $handler->makeEmptyContent();
            }
            $page = WikiPage::factory( $title );
        }
 
        $parserOptions = ParserOptions::newFromUser( $user );
        $content = $page->getContent( Revision::RAW );
 
        if ( !$content ) {
            // TODO: somehow show a warning to the user!
            return $handler->makeEmptyContent();
        }
 
        if ( $content->getModel() !== $handler->getModelID() ) {
            $converted = $content->convert( $handler->getModelID() );
 
            if ( !$converted ) {
                // TODO: somehow show a warning to the user!
                wfDebug( "Attempt to preload incompatible content: " .
                    "can't convert " . $content->getModel() .
                    " to " . $handler->getModelID() );
 
                return $handler->makeEmptyContent();
            }
 
            $content = $converted;
        }
 
        return $content->preloadTransform( $title, $parserOptions, $params );
    }
 
    public function tokenOk( &$request ) {
        $token = $request->getVal( 'wpEditToken' );
        $user = $this->context->getUser();
        $this->mTokenOk = $user->matchEditToken( $token );
        $this->mTokenOkExceptSuffix = $user->matchEditTokenNoSuffix( $token );
        return $this->mTokenOk;
    }
 
    protected function setPostEditCookie( $statusValue ) {
        $revisionId = $this->page->getLatest();
        $postEditKey = self::POST_EDIT_COOKIE_KEY_PREFIX . $revisionId;
 
        $val = 'saved';
        if ( $statusValue == self::AS_SUCCESS_NEW_ARTICLE ) {
            $val = 'created';
        } elseif ( $this->oldid ) {
            $val = 'restored';
        }
 
        $response = $this->context->getRequest()->response();
        $response->setCookie( $postEditKey, $val, time() + self::POST_EDIT_COOKIE_DURATION );
    }
 
    public function attemptSave( &$resultDetails = false ) {
        // TODO: MCR: treat $this->minoredit like $this->bot and check isAllowed( 'minoredit' )!
        // Also, add $this->autopatrol like $this->bot and check isAllowed( 'autopatrol' )!
        // This is needed since PageUpdater no longer checks these rights!
 
        // Allow bots to exempt some edits from bot flagging
        $bot = $this->context->getUser()->isAllowed( 'bot' ) && $this->bot;
        $status = $this->internalAttemptSave( $resultDetails, $bot );
 
        Hooks::run( 'EditPage::attemptSave:after', [ $this, $status, $resultDetails ] );
 
        return $status;
    }
 
    private function incrementResolvedConflicts() {
        if ( $this->context->getRequest()->getText( 'mode' ) !== 'conflict' ) {
            return;
        }
 
        $this->getEditConflictHelper()->incrementResolvedStats();
    }
 
    private function handleStatus( Status $status, $resultDetails ) {
        if ( $status->value == self::AS_SUCCESS_UPDATE
            || $status->value == self::AS_SUCCESS_NEW_ARTICLE
        ) {
            $this->incrementResolvedConflicts();
 
            $this->didSave = true;
            if ( !$resultDetails['nullEdit'] ) {
                $this->setPostEditCookie( $status->value );
            }
        }
 
        $out = $this->context->getOutput();
 
        // "wpExtraQueryRedirect" is a hidden input to modify
        // after save URL and is not used by actual edit form
        $request = $this->context->getRequest();
        $extraQueryRedirect = $request->getVal( 'wpExtraQueryRedirect' );
 
        switch ( $status->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:
            case self::AS_BLANK_ARTICLE:
            case self::AS_SELF_REDIRECT:
                return true;
 
            case self::AS_HOOK_ERROR:
                return false;
 
            case self::AS_CANNOT_USE_CUSTOM_MODEL:
            case self::AS_PARSE_ERROR:
            case self::AS_UNICODE_NOT_SUPPORTED:
                $out->wrapWikiTextAsInterface( 'error', $status->getWikiText() );
                return true;
 
            case self::AS_SUCCESS_NEW_ARTICLE:
                $query = $resultDetails['redirect'] ? 'redirect=no' : '';
                if ( $extraQueryRedirect ) {
                    if ( $query !== '' ) {
                        $query .= '&';
                    }
                    $query .= $extraQueryRedirect;
                }
                $anchor = $resultDetails['sectionanchor'] ?? '';
                $out->redirect( $this->mTitle->getFullURL( $query ) . $anchor );
                return false;
 
            case self::AS_SUCCESS_UPDATE:
                $extraQuery = '';
                $sectionanchor = $resultDetails['sectionanchor'];
 
                // Give extensions a chance to modify URL query on update
                Hooks::run(
                    'ArticleUpdateBeforeRedirect',
                    [ $this->mArticle, &$sectionanchor, &$extraQuery ]
                );
 
                if ( $resultDetails['redirect'] ) {
                    if ( $extraQuery !== '' ) {
                        $extraQuery = '&' . $extraQuery;
                    }
                    $extraQuery = 'redirect=no' . $extraQuery;
                }
                if ( $extraQueryRedirect ) {
                    if ( $extraQuery !== '' ) {
                        $extraQuery .= '&';
                    }
                    $extraQuery .= $extraQueryRedirect;
                }
 
                $out->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:
                throw new UserBlockedError( $this->context->getUser()->getBlock() );
 
            case self::AS_IMAGE_REDIRECT_ANON:
            case self::AS_IMAGE_REDIRECT_LOGGED:
                throw new PermissionsError( 'upload' );
 
            case self::AS_READ_ONLY_PAGE_ANON:
            case self::AS_READ_ONLY_PAGE_LOGGED:
                throw new PermissionsError( 'edit' );
 
            case self::AS_READ_ONLY_PAGE:
                throw new ReadOnlyError;
 
            case self::AS_RATE_LIMITED:
                throw new ThrottledError();
 
            case self::AS_NO_CREATE_PERMISSION:
                $permission = $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage';
                throw new PermissionsError( $permission );
 
            case self::AS_NO_CHANGE_CONTENT_MODEL:
                throw new PermissionsError( 'editcontentmodel' );
 
            default:
                // We don't recognize $status->value. The only way that can happen
                // is if an extension hook aborted from inside ArticleSave.
                // Render the status object into $this->hookError
                // FIXME this sucks, we should just use the Status object throughout
                $this->hookError = '<div class="error">' . "\n" . $status->getWikiText() .
                    '</div>';
                return true;
        }
    }
 
    protected function runPostMergeFilters( Content $content, Status $status, User $user ) {
        // Run old style post-section-merge edit filter
        if ( $this->hookError != '' ) {
            # ...or the hook could be expecting us to produce an error
            $status->fatal( 'hookaborted' );
            $status->value = self::AS_HOOK_ERROR_EXPECTED;
            return false;
        }
 
        // Run new style post-section-merge edit filter
        if ( !Hooks::run( 'EditFilterMergedContent',
                [ $this->context, $content, $status, $this->summary,
                $user, $this->minoredit ] )
        ) {
            # Error messages etc. could be handled within the hook...
            if ( $status->isGood() ) {
                $status->fatal( 'hookaborted' );
                // Not setting $this->hookError here is a hack to allow the hook
                // to cause a return to the edit page without $this->hookError
                // being set. This is used by ConfirmEdit to display a captcha
                // without any error message cruft.
            } else {
                $this->hookError = $this->formatStatusErrors( $status );
            }
            // Use the existing $status->value if the hook set it
            if ( !$status->value ) {
                $status->value = self::AS_HOOK_ERROR;
            }
            return false;
        } elseif ( !$status->isOK() ) {
            # ...or the hook could be expecting us to produce an error
            // FIXME this sucks, we should just use the Status object throughout
            $this->hookError = $this->formatStatusErrors( $status );
            $status->fatal( 'hookaborted' );
            $status->value = self::AS_HOOK_ERROR_EXPECTED;
            return false;
        }
 
        return true;
    }
 
    private function formatStatusErrors( Status $status ) {
        $errmsg = $status->getWikiText(
            'edit-error-short',
            'edit-error-long',
            $this->context->getLanguage()
        );
        return <<<ERROR
<div class="errorbox">
{$errmsg}
</div>
<br clear="all" />
ERROR;
    }
 
    private function newSectionSummary( &$sectionanchor = null ) {
        global $wgParser;
 
        if ( $this->sectiontitle !== '' ) {
            $sectionanchor = $this->guessSectionName( $this->sectiontitle );
            // If no edit summary was specified, create one automatically from the section
            // title and have it link to the new section. Otherwise, respect the summary as
            // passed.
            if ( $this->summary === '' ) {
                $cleanSectionTitle = $wgParser->stripSectionName( $this->sectiontitle );
                return $this->context->msg( 'newsectionsummary' )
                    ->plaintextParams( $cleanSectionTitle )->inContentLanguage()->text();
            }
        } elseif ( $this->summary !== '' ) {
            $sectionanchor = $this->guessSectionName( $this->summary );
            # This is a new section, so create a link to the new section
            # in the revision summary.
            $cleanSummary = $wgParser->stripSectionName( $this->summary );
            return $this->context->msg( 'newsectionsummary' )
                ->plaintextParams( $cleanSummary )->inContentLanguage()->text();
        }
        return $this->summary;
    }
 
    public function internalAttemptSave( &$result, $bot = false ) {
        $status = Status::newGood();
        $user = $this->context->getUser();
 
        if ( !Hooks::run( 'EditPage::attemptSave', [ $this ] ) ) {
            wfDebug( "Hook 'EditPage::attemptSave' aborted article saving\n" );
            $status->fatal( 'hookaborted' );
            $status->value = self::AS_HOOK_ERROR;
            return $status;
        }
 
        if ( $this->unicodeCheck !== self::UNICODE_CHECK ) {
            $status->fatal( 'unicode-support-fail' );
            $status->value = self::AS_UNICODE_NOT_SUPPORTED;
            return $status;
        }
 
        $request = $this->context->getRequest();
        $spam = $request->getText( 'wpAntispam' );
        if ( $spam !== '' ) {
            wfDebugLog(
                'SimpleAntiSpam',
                $user->getName() .
                ' editing "' .
                $this->mTitle->getPrefixedText() .
                '" submitted bogus field "' .
                $spam .
                '"'
            );
            $status->fatal( 'spamprotectionmatch', false );
            $status->value = self::AS_SPAM_ERROR;
            return $status;
        }
 
        try {
            # Construct Content object
            $textbox_content = $this->toEditContent( $this->textbox1 );
        } catch ( MWContentSerializationException $ex ) {
            $status->fatal(
                'content-failed-to-parse',
                $this->contentModel,
                $this->contentFormat,
                $ex->getMessage()
            );
            $status->value = self::AS_PARSE_ERROR;
            return $status;
        }
 
        # Check image redirect
        if ( $this->mTitle->getNamespace() == NS_FILE &&
            $textbox_content->isRedirect() &&
            !$user->isAllowed( 'upload' )
        ) {
                $code = $user->isAnon() ? self::AS_IMAGE_REDIRECT_ANON : self::AS_IMAGE_REDIRECT_LOGGED;
                $status->setResult( false, $code );
 
                return $status;
        }
 
        # Check for spam
        $match = self::matchSummarySpamRegex( $this->summary );
        if ( $match === false && $this->section == 'new' ) {
            # $wgSpamRegex is enforced on this new heading/summary because, unlike
            # regular summaries, it is added to the actual wikitext.
            if ( $this->sectiontitle !== '' ) {
                # This branch is taken when the API is used with the 'sectiontitle' parameter.
                $match = self::matchSpamRegex( $this->sectiontitle );
            } else {
                # This branch is taken when the "Add Topic" user interface is used, or the API
                # is used with the 'summary' parameter.
                $match = self::matchSpamRegex( $this->summary );
            }
        }
        if ( $match === false ) {
            $match = self::matchSpamRegex( $this->textbox1 );
        }
        if ( $match !== false ) {
            $result['spam'] = $match;
            $ip = $request->getIP();
            $pdbk = $this->mTitle->getPrefixedDBkey();
            $match = str_replace( "\n", '', $match );
            wfDebugLog( 'SpamRegex', "$ip spam regex hit [[$pdbk]]: \"$match\"" );
            $status->fatal( 'spamprotectionmatch', $match );
            $status->value = self::AS_SPAM_ERROR;
            return $status;
        }
        if ( !Hooks::run(
            'EditFilter',
            [ $this, $this->textbox1, $this->section, &$this->hookError, $this->summary ] )
        ) {
            # Error messages etc. could be handled within the hook...
            $status->fatal( 'hookaborted' );
            $status->value = self::AS_HOOK_ERROR;
            return $status;
        } elseif ( $this->hookError != '' ) {
            # ...or the hook could be expecting us to produce an error
            $status->fatal( 'hookaborted' );
            $status->value = self::AS_HOOK_ERROR_EXPECTED;
            return $status;
        }
 
        if ( $user->isBlockedFrom( $this->mTitle ) ) {
            // Auto-block user's IP if the account was "hard" blocked
            if ( !wfReadOnly() ) {
                $user->spreadAnyEditBlock();
            }
            # Check block state against master, thus 'false'.
            $status->setResult( false, self::AS_BLOCKED_PAGE_FOR_USER );
            return $status;
        }
 
        $this->contentLength = strlen( $this->textbox1 );
        $config = $this->context->getConfig();
        $maxArticleSize = $config->get( 'MaxArticleSize' );
        if ( $this->contentLength > $maxArticleSize * 1024 ) {
            // Error will be displayed by showEditForm()
            $this->tooBig = true;
            $status->setResult( false, self::AS_CONTENT_TOO_BIG );
            return $status;
        }
 
        if ( !$user->isAllowed( 'edit' ) ) {
            if ( $user->isAnon() ) {
                $status->setResult( false, self::AS_READ_ONLY_PAGE_ANON );
                return $status;
            } else {
                $status->fatal( 'readonlytext' );
                $status->value = self::AS_READ_ONLY_PAGE_LOGGED;
                return $status;
            }
        }
 
        $changingContentModel = false;
        if ( $this->contentModel !== $this->mTitle->getContentModel() ) {
            if ( !$config->get( 'ContentHandlerUseDB' ) ) {
                $status->fatal( 'editpage-cannot-use-custom-model' );
                $status->value = self::AS_CANNOT_USE_CUSTOM_MODEL;
                return $status;
            } elseif ( !$user->isAllowed( 'editcontentmodel' ) ) {
                $status->setResult( false, self::AS_NO_CHANGE_CONTENT_MODEL );
                return $status;
            }
            // Make sure the user can edit the page under the new content model too
            $titleWithNewContentModel = clone $this->mTitle;
            $titleWithNewContentModel->setContentModel( $this->contentModel );
            if ( !$titleWithNewContentModel->userCan( 'editcontentmodel', $user )
                || !$titleWithNewContentModel->userCan( 'edit', $user )
            ) {
                $status->setResult( false, self::AS_NO_CHANGE_CONTENT_MODEL );
                return $status;
            }
 
            $changingContentModel = true;
            $oldContentModel = $this->mTitle->getContentModel();
        }
 
        if ( $this->changeTags ) {
            $changeTagsStatus = ChangeTags::canAddTagsAccompanyingChange(
                $this->changeTags, $user );
            if ( !$changeTagsStatus->isOK() ) {
                $changeTagsStatus->value = self::AS_CHANGE_TAG_ERROR;
                return $changeTagsStatus;
            }
        }
 
        if ( wfReadOnly() ) {
            $status->fatal( 'readonlytext' );
            $status->value = self::AS_READ_ONLY_PAGE;
            return $status;
        }
        if ( $user->pingLimiter() || $user->pingLimiter( 'linkpurge', 0 )
            || ( $changingContentModel && $user->pingLimiter( 'editcontentmodel' ) )
        ) {
            $status->fatal( 'actionthrottledtext' );
            $status->value = self::AS_RATE_LIMITED;
            return $status;
        }
 
        # If the article has been deleted while editing, don't save it without
        # confirmation
        if ( $this->wasDeletedSinceLastEdit() && !$this->recreate ) {
            $status->setResult( false, self::AS_ARTICLE_WAS_DELETED );
            return $status;
        }
 
        # Load the page data from the master. If anything changes in the meantime,
        # we detect it by using page_latest like a token in a 1 try compare-and-swap.
        $this->page->loadPageData( 'fromdbmaster' );
        $new = !$this->page->exists();
 
        if ( $new ) {
            // Late check for create permission, just in case *PARANOIA*
            if ( !$this->mTitle->userCan( 'create', $user ) ) {
                $status->fatal( 'nocreatetext' );
                $status->value = self::AS_NO_CREATE_PERMISSION;
                wfDebug( __METHOD__ . ": no create permission\n" );
                return $status;
            }
 
            // Don't save a new page if it's blank or if it's a MediaWiki:
            // message with content equivalent to default (allow empty pages
            // in this case to disable messages, see T52124)
            $defaultMessageText = $this->mTitle->getDefaultMessageText();
            if ( $this->mTitle->getNamespace() === NS_MEDIAWIKI && $defaultMessageText !== false ) {
                $defaultText = $defaultMessageText;
            } else {
                $defaultText = '';
            }
 
            if ( !$this->allowBlankArticle && $this->textbox1 === $defaultText ) {
                $this->blankArticle = true;
                $status->fatal( 'blankarticle' );
                $status->setResult( false, self::AS_BLANK_ARTICLE );
                return $status;
            }
 
            if ( !$this->runPostMergeFilters( $textbox_content, $status, $user ) ) {
                return $status;
            }
 
            $content = $textbox_content;
 
            $result['sectionanchor'] = '';
            if ( $this->section == 'new' ) {
                if ( $this->sectiontitle !== '' ) {
                    // Insert the section title above the content.
                    $content = $content->addSectionHeader( $this->sectiontitle );
                } elseif ( $this->summary !== '' ) {
                    // Insert the section title above the content.
                    $content = $content->addSectionHeader( $this->summary );
                }
                $this->summary = $this->newSectionSummary( $result['sectionanchor'] );
            }
 
            $status->value = self::AS_SUCCESS_NEW_ARTICLE;
 
        } else { # not $new
 
            # Article exists. Check for edit conflict.
 
            $this->page->clear(); # Force reload of dates, etc.
            $timestamp = $this->page->getTimestamp();
            $latest = $this->page->getLatest();
 
            wfDebug( "timestamp: {$timestamp}, edittime: {$this->edittime}\n" );
 
            // An edit conflict is detected if the current revision is different from the
            // revision that was current when editing was initiated on the client.
            // This is checked based on the timestamp and revision ID.
            // TODO: the timestamp based check can probably go away now.
            if ( $timestamp != $this->edittime
                || ( $this->editRevId !== null && $this->editRevId != $latest )
            ) {
                $this->isConflict = true;
                if ( $this->section == 'new' ) {
                    if ( $this->page->getUserText() == $user->getName() &&
                        $this->page->getComment() == $this->newSectionSummary()
                    ) {
                        // Probably a duplicate submission of a new comment.
                        // This can happen when CDN 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 == ''
                    && Revision::userWasLastToEdit(
                        DB_MASTER, $this->mTitle->getArticleID(),
                        $user->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 sectiontitle is set, use it, otherwise use the summary as the section title.
            if ( $this->sectiontitle !== '' ) {
                $sectionTitle = $this->sectiontitle;
            } else {
                $sectionTitle = $this->summary;
            }
 
            $content = null;
 
            if ( $this->isConflict ) {
                wfDebug( __METHOD__
                    . ": conflict! getting section '{$this->section}' for time '{$this->edittime}'"
                    . " (id '{$this->editRevId}') (article time '{$timestamp}')\n" );
                // @TODO: replaceSectionAtRev() with base ID (not prior current) for ?oldid=X case
                // ...or disable section editing for non-current revisions (not exposed anyway).
                if ( $this->editRevId !== null ) {
                    $content = $this->page->replaceSectionAtRev(
                        $this->section,
                        $textbox_content,
                        $sectionTitle,
                        $this->editRevId
                    );
                } else {
                    $content = $this->page->replaceSectionContent(
                        $this->section,
                        $textbox_content,
                        $sectionTitle,
                        $this->edittime
                    );
                }
            } else {
                wfDebug( __METHOD__ . ": getting section '{$this->section}'\n" );
                $content = $this->page->replaceSectionContent(
                    $this->section,
                    $textbox_content,
                    $sectionTitle
                );
            }
 
            if ( is_null( $content ) ) {
                wfDebug( __METHOD__ . ": activating conflict; section replace failed.\n" );
                $this->isConflict = true;
                $content = $textbox_content; // do not try to merge here!
            } elseif ( $this->isConflict ) {
                # Attempt merge
                if ( $this->mergeChangesIntoContent( $content ) ) {
                    // 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 = ContentHandler::getContentText( $content );
                    wfDebug( __METHOD__ . ": Keeping edit conflict, failed merge.\n" );
                }
            }
 
            if ( $this->isConflict ) {
                $status->setResult( false, self::AS_CONFLICT_DETECTED );
                return $status;
            }
 
            if ( !$this->runPostMergeFilters( $content, $status, $user ) ) {
                return $status;
            }
 
            if ( $this->section == 'new' ) {
                // Handle the user preference to force summaries here
                if ( !$this->allowBlankSummary && trim( $this->summary ) == '' ) {
                    $this->missingSummary = true;
                    $status->fatal( 'missingsummary' ); // or 'missingcommentheader' if $section == 'new'. Blegh
                    $status->value = self::AS_SUMMARY_NEEDED;
                    return $status;
                }
 
                // Do not allow the user to post an empty comment
                if ( $this->textbox1 == '' ) {
                    $this->missingComment = true;
                    $status->fatal( 'missingcommenttext' );
                    $status->value = self::AS_TEXTBOX_EMPTY;
                    return $status;
                }
            } elseif ( !$this->allowBlankSummary
                && !$content->equals( $this->getOriginalContent( $user ) )
                && !$content->isRedirect()
                && md5( $this->summary ) == $this->autoSumm
            ) {
                $this->missingSummary = true;
                $status->fatal( 'missingsummary' );
                $status->value = self::AS_SUMMARY_NEEDED;
                return $status;
            }
 
            # All's well
            $sectionanchor = '';
            if ( $this->section == 'new' ) {
                $this->summary = $this->newSectionSummary( $sectionanchor );
            } 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::replaceSectionAtRev
                # 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 = $this->guessSectionName( $matches[2] );
                }
            }
            $result['sectionanchor'] = $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 = $this->toEditText( $content );
            $this->section = '';
 
            $status->value = self::AS_SUCCESS_UPDATE;
        }
 
        if ( !$this->allowSelfRedirect
            && $content->isRedirect()
            && $content->getRedirectTarget()->equals( $this->getTitle() )
        ) {
            // If the page already redirects to itself, don't warn.
            $currentTarget = $this->getCurrentContent()->getRedirectTarget();
            if ( !$currentTarget || !$currentTarget->equals( $this->getTitle() ) ) {
                $this->selfRedirect = true;
                $status->fatal( 'selfredirect' );
                $status->value = self::AS_SELF_REDIRECT;
                return $status;
            }
        }
 
        // Check for length errors again now that the section is merged in
        $this->contentLength = strlen( $this->toEditText( $content ) );
        if ( $this->contentLength > $maxArticleSize * 1024 ) {
            $this->tooBig = true;
            $status->setResult( false, self::AS_MAX_ARTICLE_SIZE_EXCEEDED );
            return $status;
        }
 
        $flags = EDIT_AUTOSUMMARY |
            ( $new ? EDIT_NEW : EDIT_UPDATE ) |
            ( ( $this->minoredit && !$this->isNew ) ? EDIT_MINOR : 0 ) |
            ( $bot ? EDIT_FORCE_BOT : 0 );
 
        $doEditStatus = $this->page->doEditContent(
            $content,
            $this->summary,
            $flags,
            false,
            $user,
            $content->getDefaultFormat(),
            $this->changeTags,
            $this->undidRev
        );
 
        if ( !$doEditStatus->isOK() ) {
            // Failure from doEdit()
            // Show the edit conflict page for certain recognized errors from doEdit(),
            // but don't show it for errors from extension hooks
            $errors = $doEditStatus->getErrorsArray();
            if ( in_array( $errors[0][0],
                    [ 'edit-gone-missing', 'edit-conflict', 'edit-already-exists' ] )
            ) {
                $this->isConflict = true;
                // Destroys data doEdit() put in $status->value but who cares
                $doEditStatus->value = self::AS_END;
            }
            return $doEditStatus;
        }
 
        $result['nullEdit'] = $doEditStatus->hasMessage( 'edit-no-change' );
        if ( $result['nullEdit'] ) {
            // We don't know if it was a null edit until now, so increment here
            $user->pingLimiter( 'linkpurge' );
        }
        $result['redirect'] = $content->isRedirect();
 
        $this->updateWatchlist();
 
        // If the content model changed, add a log entry
        if ( $changingContentModel ) {
            $this->addContentModelChangeLogEntry(
                $user,
                $new ? false : $oldContentModel,
                $this->contentModel,
                $this->summary
            );
        }
 
        return $status;
    }
 
    protected function addContentModelChangeLogEntry( User $user, $oldModel, $newModel, $reason ) {
        $new = $oldModel === false;
        $log = new ManualLogEntry( 'contentmodel', $new ? 'new' : 'change' );
        $log->setPerformer( $user );
        $log->setTarget( $this->mTitle );
        $log->setComment( $reason );
        $log->setParameters( [
            '4::oldmodel' => $oldModel,
            '5::newmodel' => $newModel
        ] );
        $logid = $log->insert();
        $log->publish( $logid );
    }
 
    protected function updateWatchlist() {
        $user = $this->context->getUser();
        if ( !$user->isLoggedIn() ) {
            return;
        }
 
        $title = $this->mTitle;
        $watch = $this->watchthis;
        // Do this in its own transaction to reduce contention...
        DeferredUpdates::addCallableUpdate( function () use ( $user, $title, $watch ) {
            if ( $watch == $user->isWatched( $title, User::IGNORE_USER_RIGHTS ) ) {
                return; // nothing to change
            }
            WatchAction::doWatchOrUnwatch( $watch, $title, $user );
        } );
    }
 
    private function mergeChangesIntoContent( &$editContent ) {
        $db = wfGetDB( DB_MASTER );
 
        // This is the revision that was current at the time editing was initiated on the client,
        // even if the edit was based on an old revision.
        $baseRevision = $this->getBaseRevision();
        $baseContent = $baseRevision ? $baseRevision->getContent() : null;
 
        if ( is_null( $baseContent ) ) {
            return false;
        }
 
        // The current state, we want to merge updates into it
        $currentRevision = Revision::loadFromTitle( $db, $this->mTitle );
        $currentContent = $currentRevision ? $currentRevision->getContent() : null;
 
        if ( is_null( $currentContent ) ) {
            return false;
        }
 
        $handler = ContentHandler::getForModelID( $baseContent->getModel() );
 
        $result = $handler->merge3( $baseContent, $editContent, $currentContent );
 
        if ( $result ) {
            $editContent = $result;
            // Update parentRevId to what we just merged.
            $this->parentRevId = $currentRevision->getId();
            return true;
        }
 
        return false;
    }
 
    public function getBaseRevision() {
        if ( !$this->mBaseRevision ) {
            $db = wfGetDB( DB_MASTER );
            $this->mBaseRevision = $this->editRevId
                ? Revision::newFromId( $this->editRevId, Revision::READ_LATEST )
                : Revision::loadFromTimestamp( $db, $this->mTitle, $this->edittime );
        }
        return $this->mBaseRevision;
    }
 
    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 );
    }
 
    public static function matchSummarySpamRegex( $text ) {
        global $wgSummarySpamRegex;
        $regexes = (array)$wgSummarySpamRegex;
        return self::matchSpamRegexInternal( $text, $regexes );
    }
 
    protected static function matchSpamRegexInternal( $text, $regexes ) {
        foreach ( $regexes as $regex ) {
            $matches = [];
            if ( preg_match( $regex, $text, $matches ) ) {
                return $matches[0];
            }
        }
        return false;
    }
 
    public function setHeaders() {
        $out = $this->context->getOutput();
 
        $out->addModules( 'mediawiki.action.edit' );
        $out->addModuleStyles( 'mediawiki.action.edit.styles' );
        $out->addModuleStyles( 'mediawiki.editfont.styles' );
 
        $user = $this->context->getUser();
 
        if ( $user->getOption( 'uselivepreview' ) ) {
            $out->addModules( 'mediawiki.action.edit.preview' );
        }
 
        if ( $user->getOption( 'useeditwarning' ) ) {
            $out->addModules( 'mediawiki.action.edit.editWarning' );
        }
 
        # Enabled article-related sidebar, toplinks, etc.
        $out->setArticleRelated( true );
 
        $contextTitle = $this->getContextTitle();
        if ( $this->isConflict ) {
            $msg = 'editconflict';
        } elseif ( $contextTitle->exists() && $this->section != '' ) {
            $msg = $this->section == 'new' ? 'editingcomment' : 'editingsection';
        } else {
            $msg = $contextTitle->exists()
                || ( $contextTitle->getNamespace() == NS_MEDIAWIKI
                    && $contextTitle->getDefaultMessageText() !== false
                )
                ? 'editing'
                : 'creating';
        }
 
        # Use the title defined by DISPLAYTITLE magic word when present
        # NOTE: getDisplayTitle() returns HTML while getPrefixedText() returns plain text.
        #       setPageTitle() treats the input as wikitext, which should be safe in either case.
        $displayTitle = isset( $this->mParserOutput ) ? $this->mParserOutput->getDisplayTitle() : false;
        if ( $displayTitle === false ) {
            $displayTitle = $contextTitle->getPrefixedText();
        } else {
            $out->setDisplayTitle( $displayTitle );
        }
        $out->setPageTitle( $this->context->msg( $msg, $displayTitle ) );
 
        $config = $this->context->getConfig();
 
        # Transmit the name of the message to JavaScript for live preview
        # Keep Resources.php/mediawiki.action.edit.preview in sync with the possible keys
        $out->addJsConfigVars( [
            'wgEditMessage' => $msg,
            'wgAjaxEditStash' => $config->get( 'AjaxEditStash' ),
        ] );
 
        // Add whether to use 'save' or 'publish' messages to JavaScript for post-edit, other
        // editors, etc.
        $out->addJsConfigVars(
            'wgEditSubmitButtonLabelPublish',
            $config->get( 'EditSubmitButtonLabelPublish' )
        );
    }
 
    protected function showIntro() {
        if ( $this->suppressIntro ) {
            return;
        }
 
        $out = $this->context->getOutput();
        $namespace = $this->mTitle->getNamespace();
 
        if ( $namespace == NS_MEDIAWIKI ) {
            # Show a warning if editing an interface message
            $out->wrapWikiMsg( "<div class='mw-editinginterface'>\n$1\n</div>", 'editinginterface' );
            # If this is a default message (but not css, json, or js),
            # show a hint that it is translatable on translatewiki.net
            if (
                !$this->mTitle->hasContentModel( CONTENT_MODEL_CSS )
                && !$this->mTitle->hasContentModel( CONTENT_MODEL_JSON )
                && !$this->mTitle->hasContentModel( CONTENT_MODEL_JAVASCRIPT )
            ) {
                $defaultMessageText = $this->mTitle->getDefaultMessageText();
                if ( $defaultMessageText !== false ) {
                    $out->wrapWikiMsg( "<div class='mw-translateinterface'>\n$1\n</div>",
                        'translateinterface' );
                }
            }
        } elseif ( $namespace == NS_FILE ) {
            # Show a hint to shared repo
            $file = wfFindFile( $this->mTitle );
            if ( $file && !$file->isLocal() ) {
                $descUrl = $file->getDescriptionUrl();
                # there must be a description url to show a hint to shared repo
                if ( $descUrl ) {
                    if ( !$this->mTitle->exists() ) {
                        $out->wrapWikiMsg( "<div class=\"mw-sharedupload-desc-create\">\n$1\n</div>", [
                                    'sharedupload-desc-create', $file->getRepo()->getDisplayName(), $descUrl
                        ] );
                    } else {
                        $out->wrapWikiMsg( "<div class=\"mw-sharedupload-desc-edit\">\n$1\n</div>", [
                                    'sharedupload-desc-edit', $file->getRepo()->getDisplayName(), $descUrl
                        ] );
                    }
                }
            }
        }
 
        # 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 ) {
            $username = explode( '/', $this->mTitle->getText(), 2 )[0];
            $user = User::newFromName( $username, false /* allow IP users */ );
            $ip = User::isIP( $username );
            $block = Block::newFromTarget( $user, $user );
            if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
                $out->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n$1\n</div>",
                    [ 'userpage-userdoesnotexist', wfEscapeWikiText( $username ) ] );
            } elseif (
                !is_null( $block ) &&
                $block->getType() != Block::TYPE_AUTO &&
                ( $block->isSitewide() || $user->isBlockedFrom( $this->mTitle ) )
            ) {
                // Show log extract if the user is sitewide blocked or is partially
                // blocked and not allowed to edit their user page or user talk page
                LogEventsList::showLogExtract(
                    $out,
                    'block',
                    MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
                    '',
                    [
                        'lim' => 1,
                        'showIfEmpty' => false,
                        'msgKey' => [
                            '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() ) {
            $helpLink = wfExpandUrl( Skin::makeInternalOrExternalUrl(
                $this->context->msg( 'helppage' )->inContentLanguage()->text()
            ) );
            if ( $this->context->getUser()->isLoggedIn() ) {
                $out->wrapWikiMsg(
                    // Suppress the external link icon, consider the help url an internal one
                    "<div class=\"mw-newarticletext plainlinks\">\n$1\n</div>",
                    [
                        'newarticletext',
                        $helpLink
                    ]
                );
            } else {
                $out->wrapWikiMsg(
                    // Suppress the external link icon, consider the help url an internal one
                    "<div class=\"mw-newarticletextanon plainlinks\">\n$1\n</div>",
                    [
                        'newarticletextanon',
                        $helpLink
                    ]
                );
            }
        }
        # Give a notice if the user is editing a deleted/moved page...
        if ( !$this->mTitle->exists() ) {
            $dbr = wfGetDB( DB_REPLICA );
 
            LogEventsList::showLogExtract( $out, [ 'delete', 'move' ], $this->mTitle,
                '',
                [
                    'lim' => 10,
                    'conds' => [ 'log_action != ' . $dbr->addQuotes( 'revision' ) ],
                    'showIfEmpty' => false,
                    'msgKey' => [ 'recreate-moveddeleted-warn' ]
                ]
            );
        }
    }
 
    protected function showCustomIntro() {
        if ( $this->editintro ) {
            $title = Title::newFromText( $this->editintro );
            if ( $title instanceof Title && $title->exists() && $title->userCan( 'read' ) ) {
                // Added using template syntax, to take <noinclude>'s into account.
                $this->context->getOutput()->addWikiTextAsContent(
                    '<div class="mw-editintro">{{:' . $title->getFullText() . '}}</div>',
                    /*linestart*/true,
                    $this->mTitle
                );
                return true;
            }
        }
        return false;
    }
 
    protected function toEditText( $content ) {
        if ( $content === null || $content === false || is_string( $content ) ) {
            return $content;
        }
 
        if ( !$this->isSupportedContentModel( $content->getModel() ) ) {
            throw new MWException( 'This content model is not supported: ' . $content->getModel() );
        }
 
        return $content->serialize( $this->contentFormat );
    }
 
    protected function toEditContent( $text ) {
        if ( $text === false || $text === null ) {
            return $text;
        }
 
        $content = ContentHandler::makeContent( $text, $this->getTitle(),
            $this->contentModel, $this->contentFormat );
 
        if ( !$this->isSupportedContentModel( $content->getModel() ) ) {
            throw new MWException( 'This content model is not supported: ' . $content->getModel() );
        }
 
        return $content;
    }
 
    public function showEditForm( $formCallback = null ) {
        # 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();
        }
 
        $out = $this->context->getOutput();
 
        // Avoid PHP 7.1 warning of passing $this by reference
        $editPage = $this;
        Hooks::run( 'EditPage::showEditForm:initial', [ &$editPage, &$out ] );
 
        $this->setHeaders();
 
        $this->addTalkPageText();
        $this->addEditNotices();
 
        if ( !$this->isConflict &&
            $this->section != '' &&
            !$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
            $out->showErrorPage( 'sectioneditnotsupported-title', 'sectioneditnotsupported-text' );
            return;
        }
 
        $this->showHeader();
 
        $out->addHTML( $this->editFormPageTop );
 
        $user = $this->context->getUser();
        if ( $user->getOption( 'previewontop' ) ) {
            $this->displayPreviewArea( $previewOutput, true );
        }
 
        $out->addHTML( $this->editFormTextTop );
 
        if ( $this->wasDeletedSinceLastEdit() && $this->formtype !== 'save' ) {
            $out->wrapWikiMsg( "<div class='error mw-deleted-while-editing'>\n$1\n</div>",
                'deletedwhileediting' );
        }
 
        // @todo add EditForm plugin interface and use it here!
        //       search for textarea1 and textarea2, and allow EditForm to override all uses.
        $out->addHTML( Html::openElement(
            'form',
            [
                'class' => 'mw-editform',
                'id' => self::EDITFORM_ID,
                'name' => self::EDITFORM_ID,
                'method' => 'post',
                'action' => $this->getActionURL( $this->getContextTitle() ),
                'enctype' => 'multipart/form-data'
            ]
        ) );
 
        if ( is_callable( $formCallback ) ) {
            wfWarn( 'The $formCallback parameter to ' . __METHOD__ . 'is deprecated' );
            call_user_func_array( $formCallback, [ &$out ] );
        }
 
        // Add a check for Unicode support
        $out->addHTML( Html::hidden( 'wpUnicodeCheck', self::UNICODE_CHECK ) );
 
        // Add an empty field to trip up spambots
        $out->addHTML(
            Xml::openElement( 'div', [ 'id' => 'antispam-container', 'style' => 'display: none;' ] )
            . Html::rawElement(
                'label',
                [ 'for' => 'wpAntispam' ],
                $this->context->msg( 'simpleantispam-label' )->parse()
            )
            . Xml::element(
                'input',
                [
                    'type' => 'text',
                    'name' => 'wpAntispam',
                    'id' => 'wpAntispam',
                    'value' => ''
                ]
            )
            . Xml::closeElement( 'div' )
        );
 
        // Avoid PHP 7.1 warning of passing $this by reference
        $editPage = $this;
        Hooks::run( 'EditPage::showEditForm:fields', [ &$editPage, &$out ] );
 
        // Put these up at the top to ensure they aren't lost on early form submission
        $this->showFormBeforeText();
 
        if ( $this->wasDeletedSinceLastEdit() && $this->formtype == 'save' ) {
            $username = $this->lastDelete->user_name;
            $comment = CommentStore::getStore()
                ->getComment( 'log_comment', $this->lastDelete )->text;
 
            // 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';
            $out->addHTML(
                '<div class="mw-confirm-recreate">' .
                    $this->context->msg( $key, $username, "<nowiki>$comment</nowiki>" )->parse() .
                Xml::checkLabel( $this->context->msg( 'recreate' )->text(), 'wpRecreate', 'wpRecreate', false,
                    [ 'title' => Linker::titleAttrib( 'recreate' ), 'tabindex' => 1, 'id' => 'wpRecreate' ]
                ) .
                '</div>'
            );
        }
 
        # When the summary is hidden, also hide them on preview/show changes
        if ( $this->nosummary ) {
            $out->addHTML( Html::hidden( 'nosummary', true ) );
        }
 
        # 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 ) ) {
            $out->addHTML( Html::hidden( 'wpIgnoreBlankSummary', true ) );
        }
 
        if ( $this->undidRev ) {
            $out->addHTML( Html::hidden( 'wpUndidRevision', $this->undidRev ) );
        }
 
        if ( $this->selfRedirect ) {
            $out->addHTML( Html::hidden( 'wpIgnoreSelfRedirect', true ) );
        }
 
        if ( $this->hasPresetSummary ) {
            // If a summary has been preset using &summary= we don't want to prompt for
            // a different summary. Only prompt for a summary if the summary is blanked.
            // (T19416)
            $this->autoSumm = md5( '' );
        }
 
        $autosumm = $this->autoSumm !== '' ? $this->autoSumm : md5( $this->summary );
        $out->addHTML( Html::hidden( 'wpAutoSummary', $autosumm ) );
 
        $out->addHTML( Html::hidden( 'oldid', $this->oldid ) );
        $out->addHTML( Html::hidden( 'parentRevId', $this->getParentRevId() ) );
 
        $out->addHTML( Html::hidden( 'format', $this->contentFormat ) );
        $out->addHTML( Html::hidden( 'model', $this->contentModel ) );
 
        $out->enableOOUI();
 
        if ( $this->section == 'new' ) {
            $this->showSummaryInput( true, $this->summary );
            $out->addHTML( $this->getSummaryPreview( true, $this->summary ) );
        }
 
        $out->addHTML( $this->editFormTextBeforeContent );
        if ( $this->isConflict ) {
            // In an edit conflict, we turn textbox2 into the user's text,
            // and textbox1 into the stored version
            $this->textbox2 = $this->textbox1;
 
            $content = $this->getCurrentContent();
            $this->textbox1 = $this->toEditText( $content );
 
            $editConflictHelper = $this->getEditConflictHelper();
            $editConflictHelper->setTextboxes( $this->textbox2, $this->textbox1 );
            $editConflictHelper->setContentModel( $this->contentModel );
            $editConflictHelper->setContentFormat( $this->contentFormat );
            $out->addHTML( $editConflictHelper->getEditFormHtmlBeforeContent() );
        }
 
        if ( !$this->mTitle->isUserConfigPage() ) {
            $out->addHTML( self::getEditToolbar( $this->mTitle ) );
        }
 
        if ( $this->blankArticle ) {
            $out->addHTML( Html::hidden( 'wpIgnoreBlankArticle', true ) );
        }
 
        if ( $this->isConflict ) {
            // In an edit conflict bypass the overridable 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.
            $conflictTextBoxAttribs = [];
            if ( $this->wasDeletedSinceLastEdit() ) {
                $conflictTextBoxAttribs['style'] = 'display:none;';
            } elseif ( $this->isOldRev ) {
                $conflictTextBoxAttribs['class'] = 'mw-textarea-oldrev';
            }
 
            $out->addHTML( $editConflictHelper->getEditConflictMainTextBox( $conflictTextBoxAttribs ) );
            $out->addHTML( $editConflictHelper->getEditFormHtmlAfterContent() );
        } else {
            $this->showContentForm();
        }
 
        $out->addHTML( $this->editFormTextAfterContent );
 
        $this->showStandardInputs();
 
        $this->showFormAfterText();
 
        $this->showTosSummary();
 
        $this->showEditTools();
 
        $out->addHTML( $this->editFormTextAfterTools . "\n" );
 
        $out->addHTML( $this->makeTemplatesOnThisPageList( $this->getTemplates() ) );
 
        $out->addHTML( Html::rawElement( 'div', [ 'class' => 'hiddencats' ],
            Linker::formatHiddenCategories( $this->page->getHiddenCategories() ) ) );
 
        $out->addHTML( Html::rawElement( 'div', [ 'class' => 'limitreport' ],
            self::getPreviewLimitReport( $this->mParserOutput ) ) );
 
        $out->addModules( 'mediawiki.action.edit.collapsibleFooter' );
 
        if ( $this->isConflict ) {
            try {
                $this->showConflict();
            } catch ( MWContentSerializationException $ex ) {
                // this can't really happen, but be nice if it does.
                $msg = $this->context->msg(
                    'content-failed-to-parse',
                    $this->contentModel,
                    $this->contentFormat,
                    $ex->getMessage()
                );
                $out->wrapWikiTextAsInterface( 'error', $msg->plain() );
            }
        }
 
        // Set a hidden field so JS knows what edit form mode we are in
        if ( $this->isConflict ) {
            $mode = 'conflict';
        } elseif ( $this->preview ) {
            $mode = 'preview';
        } elseif ( $this->diff ) {
            $mode = 'diff';
        } else {
            $mode = 'text';
        }
        $out->addHTML( Html::hidden( 'mode', $mode, [ 'id' => 'mw-edit-mode' ] ) );
 
        // Marker for detecting truncated form data.  This must be the last
        // parameter sent in order to be of use, so do not move me.
        $out->addHTML( Html::hidden( 'wpUltimateParam', true ) );
        $out->addHTML( $this->editFormTextBottom . "\n</form>\n" );
 
        if ( !$user->getOption( 'previewontop' ) ) {
            $this->displayPreviewArea( $previewOutput, false );
        }
    }
 
    public function makeTemplatesOnThisPageList( array $templates ) {
        $templateListFormatter = new TemplatesOnThisPageFormatter(
            $this->context, MediaWikiServices::getInstance()->getLinkRenderer()
        );
 
        // preview if preview, else section if section, else false
        $type = false;
        if ( $this->preview ) {
            $type = 'preview';
        } elseif ( $this->section != '' ) {
            $type = 'section';
        }
 
        return Html::rawElement( 'div', [ 'class' => 'templatesUsed' ],
            $templateListFormatter->format( $templates, $type )
        );
    }
 
    public static function extractSectionTitle( $text ) {
        preg_match( "/^(=+)(.+)\\1\\s*(\n|$)/i", $text, $matches );
        if ( !empty( $matches[2] ) ) {
            global $wgParser;
            return $wgParser->stripSectionName( trim( $matches[2] ) );
        } else {
            return false;
        }
    }
 
    protected function showHeader() {
        $out = $this->context->getOutput();
        $user = $this->context->getUser();
        if ( $this->isConflict ) {
            $this->addExplainConflictHeader( $out );
            $this->editRevId = $this->page->getLatest();
        } else {
            if ( $this->section != '' && $this->section != 'new' && !$this->summary &&
                !$this->preview && !$this->diff
            ) {
                $sectionTitle = self::extractSectionTitle( $this->textbox1 ); // FIXME: use Content object
                if ( $sectionTitle !== false ) {
                    $this->summary = "/* $sectionTitle */ ";
                }
            }
 
            $buttonLabel = $this->context->msg( $this->getSubmitButtonLabel() )->text();
 
            if ( $this->missingComment ) {
                $out->wrapWikiMsg( "<div id='mw-missingcommenttext'>\n$1\n</div>", 'missingcommenttext' );
            }
 
            if ( $this->missingSummary && $this->section != 'new' ) {
                $out->wrapWikiMsg(
                    "<div id='mw-missingsummary'>\n$1\n</div>",
                    [ 'missingsummary', $buttonLabel ]
                );
            }
 
            if ( $this->missingSummary && $this->section == 'new' ) {
                $out->wrapWikiMsg(
                    "<div id='mw-missingcommentheader'>\n$1\n</div>",
                    [ 'missingcommentheader', $buttonLabel ]
                );
            }
 
            if ( $this->blankArticle ) {
                $out->wrapWikiMsg(
                    "<div id='mw-blankarticle'>\n$1\n</div>",
                    [ 'blankarticle', $buttonLabel ]
                );
            }
 
            if ( $this->selfRedirect ) {
                $out->wrapWikiMsg(
                    "<div id='mw-selfredirect'>\n$1\n</div>",
                    [ 'selfredirect', $buttonLabel ]
                );
            }
 
            if ( $this->hookError !== '' ) {
                $out->addWikiTextAsInterface( $this->hookError );
            }
 
            if ( $this->section != 'new' ) {
                $revision = $this->mArticle->getRevisionFetched();
                if ( $revision ) {
                    // Let sysop know that this will make private content public if saved
 
                    if ( !$revision->userCan( Revision::DELETED_TEXT, $user ) ) {
                        $out->wrapWikiMsg(
                            "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
                            'rev-deleted-text-permission'
                        );
                    } elseif ( $revision->isDeleted( Revision::DELETED_TEXT ) ) {
                        $out->wrapWikiMsg(
                            "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
                            'rev-deleted-text-view'
                        );
                    }
 
                    if ( !$revision->isCurrent() ) {
                        $this->mArticle->setOldSubtitle( $revision->getId() );
                        $out->wrapWikiMsg(
                            Html::warningBox( "\n$1\n" ),
                            'editingold'
                        );
                        $this->isOldRev = true;
                    }
                } elseif ( $this->mTitle->exists() ) {
                    // Something went wrong
 
                    $out->wrapWikiMsg( "<div class='errorbox'>\n$1\n</div>\n",
                        [ 'missing-revision', $this->oldid ] );
                }
            }
        }
 
        if ( wfReadOnly() ) {
            $out->wrapWikiMsg(
                "<div id=\"mw-read-only-warning\">\n$1\n</div>",
                [ 'readonlywarning', wfReadOnlyReason() ]
            );
        } elseif ( $user->isAnon() ) {
            if ( $this->formtype != 'preview' ) {
                $returntoquery = array_diff_key(
                    $this->context->getRequest()->getValues(),
                    [ 'title' => true, 'returnto' => true, 'returntoquery' => true ]
                );
                $out->wrapWikiMsg(
                    "<div id='mw-anon-edit-warning' class='warningbox'>\n$1\n</div>",
                    [ 'anoneditwarning',
                        // Log-in link
                        SpecialPage::getTitleFor( 'Userlogin' )->getFullURL( [
                            'returnto' => $this->getTitle()->getPrefixedDBkey(),
                            'returntoquery' => wfArrayToCgi( $returntoquery ),
                        ] ),
                        // Sign-up link
                        SpecialPage::getTitleFor( 'CreateAccount' )->getFullURL( [
                            'returnto' => $this->getTitle()->getPrefixedDBkey(),
                            'returntoquery' => wfArrayToCgi( $returntoquery ),
                        ] )
                    ]
                );
            } else {
                $out->wrapWikiMsg( "<div id=\"mw-anon-preview-warning\" class=\"warningbox\">\n$1</div>",
                    'anonpreviewwarning'
                );
            }
        } elseif ( $this->mTitle->isUserConfigPage() ) {
            # Check the skin exists
            if ( $this->isWrongCaseUserConfigPage() ) {
                $out->wrapWikiMsg(
                    "<div class='error' id='mw-userinvalidconfigtitle'>\n$1\n</div>",
                    [ 'userinvalidconfigtitle', $this->mTitle->getSkinFromConfigSubpage() ]
                );
            }
            if ( $this->getTitle()->isSubpageOf( $user->getUserPage() ) ) {
                $isUserCssConfig = $this->mTitle->isUserCssConfigPage();
                $isUserJsonConfig = $this->mTitle->isUserJsonConfigPage();
                $isUserJsConfig = $this->mTitle->isUserJsConfigPage();
 
                $warning = $isUserCssConfig
                    ? 'usercssispublic'
                    : ( $isUserJsonConfig ? 'userjsonispublic' : 'userjsispublic' );
 
                $out->wrapWikiMsg( '<div class="mw-userconfigpublic">$1</div>', $warning );
 
                if ( $this->formtype !== 'preview' ) {
                    $config = $this->context->getConfig();
                    if ( $isUserCssConfig && $config->get( 'AllowUserCss' ) ) {
                        $out->wrapWikiMsg(
                            "<div id='mw-usercssyoucanpreview'>\n$1\n</div>",
                            [ 'usercssyoucanpreview' ]
                        );
                    } elseif ( $isUserJsonConfig /* No comparable 'AllowUserJson' */ ) {
                        $out->wrapWikiMsg(
                            "<div id='mw-userjsonyoucanpreview'>\n$1\n</div>",
                            [ 'userjsonyoucanpreview' ]
                        );
                    } elseif ( $isUserJsConfig && $config->get( 'AllowUserJs' ) ) {
                        $out->wrapWikiMsg(
                            "<div id='mw-userjsyoucanpreview'>\n$1\n</div>",
                            [ 'userjsyoucanpreview' ]
                        );
                    }
                }
            }
        }
 
        $this->addPageProtectionWarningHeaders();
 
        $this->addLongPageWarningHeader();
 
        # Add header copyright warning
        $this->showHeaderCopyrightWarning();
    }
 
    private function getSummaryInputAttributes( array $inputAttrs = null ) {
        // HTML maxlength uses "UTF-16 code units", which means that characters outside BMP
        // (e.g. emojis) count for two each. This limit is overridden in JS to instead count
        // Unicode codepoints.
        return ( is_array( $inputAttrs ) ? $inputAttrs : [] ) + [
            'id' => 'wpSummary',
            'name' => 'wpSummary',
            'maxlength' => CommentStore::COMMENT_CHARACTER_LIMIT,
            'tabindex' => 1,
            'size' => 60,
            'spellcheck' => 'true',
        ];
    }
 
    function getSummaryInputWidget( $summary = "", $labelText = null, $inputAttrs = null ) {
        $inputAttrs = OOUI\Element::configFromHtmlAttributes(
            $this->getSummaryInputAttributes( $inputAttrs )
        );
        $inputAttrs += [
            'title' => Linker::titleAttrib( 'summary' ),
            'accessKey' => Linker::accesskey( 'summary' ),
        ];
 
        // For compatibility with old scripts and extensions, we want the legacy 'id' on the `<input>`
        $inputAttrs['inputId'] = $inputAttrs['id'];
        $inputAttrs['id'] = 'wpSummaryWidget';
 
        return new OOUI\FieldLayout(
            new OOUI\TextInputWidget( [
                'value' => $summary,
                'infusable' => true,
            ] + $inputAttrs ),
            [
                'label' => new OOUI\HtmlSnippet( $labelText ),
                'align' => 'top',
                'id' => 'wpSummaryLabel',
                'classes' => [ $this->missingSummary ? 'mw-summarymissed' : 'mw-summary' ],
            ]
        );
    }
 
    protected function showSummaryInput( $isSubjectPreview, $summary = "" ) {
        # Add a class if 'missingsummary' is triggered to allow styling of the summary line
        $summaryClass = $this->missingSummary ? 'mw-summarymissed' : 'mw-summary';
        if ( $isSubjectPreview ) {
            if ( $this->nosummary ) {
                return;
            }
        } elseif ( !$this->mShowSummaryField ) {
            return;
        }
 
        $labelText = $this->context->msg( $isSubjectPreview ? 'subject' : 'summary' )->parse();
        $this->context->getOutput()->addHTML( $this->getSummaryInputWidget(
                $summary,
                $labelText,
                [ 'class' => $summaryClass ]
            ) );
    }
 
    protected function getSummaryPreview( $isSubjectPreview, $summary = "" ) {
        // avoid spaces in preview, gets always trimmed on save
        $summary = trim( $summary );
        if ( !$summary || ( !$this->preview && !$this->diff ) ) {
            return "";
        }
 
        global $wgParser;
 
        if ( $isSubjectPreview ) {
            $summary = $this->context->msg( 'newsectionsummary' )
                ->rawParams( $wgParser->stripSectionName( $summary ) )
                ->inContentLanguage()->text();
        }
 
        $message = $isSubjectPreview ? 'subject-preview' : 'summary-preview';
 
        $summary = $this->context->msg( $message )->parse()
            . Linker::commentBlock( $summary, $this->mTitle, $isSubjectPreview );
        return Xml::tags( 'div', [ 'class' => 'mw-summary-preview' ], $summary );
    }
 
    protected function showFormBeforeText() {
        $out = $this->context->getOutput();
        $out->addHTML( Html::hidden( 'wpSection', $this->section ) );
        $out->addHTML( Html::hidden( 'wpStarttime', $this->starttime ) );
        $out->addHTML( Html::hidden( 'wpEdittime', $this->edittime ) );
        $out->addHTML( Html::hidden( 'editRevId', $this->editRevId ) );
        $out->addHTML( Html::hidden( 'wpScrolltop', $this->scrolltop, [ 'id' => 'wpScrolltop' ] ) );
    }
 
    protected function showFormAfterText() {
        $this->context->getOutput()->addHTML(
            "\n" .
            Html::hidden( "wpEditToken", $this->context->getUser()->getEditToken() ) .
            "\n"
        );
    }
 
    protected function showContentForm() {
        $this->showTextbox1();
    }
 
    protected function showTextbox1( $customAttribs = null, $textoverride = null ) {
        if ( $this->wasDeletedSinceLastEdit() && $this->formtype == 'save' ) {
            $attribs = [ 'style' => 'display:none;' ];
        } else {
            $builder = new TextboxBuilder();
            $classes = $builder->getTextboxProtectionCSSClasses( $this->getTitle() );
 
            # Is an old revision being edited?
            if ( $this->isOldRev ) {
                $classes[] = 'mw-textarea-oldrev';
            }
 
            $attribs = [ 'tabindex' => 1 ];
 
            if ( is_array( $customAttribs ) ) {
                $attribs += $customAttribs;
            }
 
            $attribs = $builder->mergeClassesIntoAttributes( $classes, $attribs );
        }
 
        $this->showTextbox(
            $textoverride ?? $this->textbox1,
            'wpTextbox1',
            $attribs
        );
    }
 
    protected function showTextbox2() {
        $this->showTextbox( $this->textbox2, 'wpTextbox2', [ 'tabindex' => 6, 'readonly' ] );
    }
 
    protected function showTextbox( $text, $name, $customAttribs = [] ) {
        $builder = new TextboxBuilder();
        $attribs = $builder->buildTextboxAttribs(
            $name,
            $customAttribs,
            $this->context->getUser(),
            $this->mTitle
        );
 
        $this->context->getOutput()->addHTML(
            Html::textarea( $name, $builder->addNewLineAtEnd( $text ), $attribs )
        );
    }
 
    protected function displayPreviewArea( $previewOutput, $isOnTop = false ) {
        $classes = [];
        if ( $isOnTop ) {
            $classes[] = 'ontop';
        }
 
        $attribs = [ 'id' => 'wikiPreview', 'class' => implode( ' ', $classes ) ];
 
        if ( $this->formtype != 'preview' ) {
            $attribs['style'] = 'display: none;';
        }
 
        $out = $this->context->getOutput();
        $out->addHTML( Xml::openElement( 'div', $attribs ) );
 
        if ( $this->formtype == 'preview' ) {
            $this->showPreview( $previewOutput );
        } else {
            // Empty content container for LivePreview
            $pageViewLang = $this->mTitle->getPageViewLanguage();
            $attribs = [ 'lang' => $pageViewLang->getHtmlCode(), 'dir' => $pageViewLang->getDir(),
                'class' => 'mw-content-' . $pageViewLang->getDir() ];
            $out->addHTML( Html::rawElement( 'div', $attribs ) );
        }
 
        $out->addHTML( '</div>' );
 
        if ( $this->formtype == 'diff' ) {
            try {
                $this->showDiff();
            } catch ( MWContentSerializationException $ex ) {
                $msg = $this->context->msg(
                    'content-failed-to-parse',
                    $this->contentModel,
                    $this->contentFormat,
                    $ex->getMessage()
                );
                $out->wrapWikiTextAsInterface( 'error', $msg->plain() );
            }
        }
    }
 
    protected function showPreview( $text ) {
        if ( $this->mArticle instanceof CategoryPage ) {
            $this->mArticle->openShowCategory();
        }
        # This hook seems slightly odd here, but makes things more
        # consistent for extensions.
        $out = $this->context->getOutput();
        Hooks::run( 'OutputPageBeforeHTML', [ &$out, &$text ] );
        $out->addHTML( $text );
        if ( $this->mArticle instanceof CategoryPage ) {
            $this->mArticle->closeShowCategory();
        }
    }
 
    public function showDiff() {
        $oldtitlemsg = 'currentrev';
        # if message does not exist, show diff against the preloaded default
        if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI && !$this->mTitle->exists() ) {
            $oldtext = $this->mTitle->getDefaultMessageText();
            if ( $oldtext !== false ) {
                $oldtitlemsg = 'defaultmessagetext';
                $oldContent = $this->toEditContent( $oldtext );
            } else {
                $oldContent = null;
            }
        } else {
            $oldContent = $this->getCurrentContent();
        }
 
        $textboxContent = $this->toEditContent( $this->textbox1 );
        if ( $this->editRevId !== null ) {
            $newContent = $this->page->replaceSectionAtRev(
                $this->section, $textboxContent, $this->summary, $this->editRevId
            );
        } else {
            $newContent = $this->page->replaceSectionContent(
                $this->section, $textboxContent, $this->summary, $this->edittime
            );
        }
 
        if ( $newContent ) {
            Hooks::run( 'EditPageGetDiffContent', [ $this, &$newContent ] );
 
            $user = $this->context->getUser();
            $popts = ParserOptions::newFromUserAndLang( $user,
                MediaWikiServices::getInstance()->getContentLanguage() );
            $newContent = $newContent->preSaveTransform( $this->mTitle, $user, $popts );
        }
 
        if ( ( $oldContent && !$oldContent->isEmpty() ) || ( $newContent && !$newContent->isEmpty() ) ) {
            $oldtitle = $this->context->msg( $oldtitlemsg )->parse();
            $newtitle = $this->context->msg( 'yourtext' )->parse();
 
            if ( !$oldContent ) {
                $oldContent = $newContent->getContentHandler()->makeEmptyContent();
            }
 
            if ( !$newContent ) {
                $newContent = $oldContent->getContentHandler()->makeEmptyContent();
            }
 
            $de = $oldContent->getContentHandler()->createDifferenceEngine( $this->context );
            $de->setContent( $oldContent, $newContent );
 
            $difftext = $de->getDiff( $oldtitle, $newtitle );
            $de->showDiffStyle();
        } else {
            $difftext = '';
        }
 
        $this->context->getOutput()->addHTML( '<div id="wikiDiff">' . $difftext . '</div>' );
    }
 
    protected function showHeaderCopyrightWarning() {
        $msg = 'editpage-head-copy-warn';
        if ( !$this->context->msg( $msg )->isDisabled() ) {
            $this->context->getOutput()->wrapWikiMsg( "<div class='editpage-head-copywarn'>\n$1\n</div>",
                'editpage-head-copy-warn' );
        }
    }
 
    protected function showTosSummary() {
        $msg = 'editpage-tos-summary';
        Hooks::run( 'EditPageTosSummary', [ $this->mTitle, &$msg ] );
        if ( !$this->context->msg( $msg )->isDisabled() ) {
            $out = $this->context->getOutput();
            $out->addHTML( '<div class="mw-tos-summary">' );
            $out->addWikiMsg( $msg );
            $out->addHTML( '</div>' );
        }
    }
 
    protected function showEditTools() {
        $this->context->getOutput()->addHTML( '<div class="mw-editTools">' .
            $this->context->msg( 'edittools' )->inContentLanguage()->parse() .
            '</div>' );
    }
 
    protected function getCopywarn() {
        return self::getCopyrightWarning( $this->mTitle );
    }
 
    public static function getCopyrightWarning( $title, $format = 'plain', $langcode = null ) {
        global $wgRightsText;
        if ( $wgRightsText ) {
            $copywarnMsg = [ 'copyrightwarning',
                '[[' . wfMessage( 'copyrightpage' )->inContentLanguage()->text() . ']]',
                $wgRightsText ];
        } else {
            $copywarnMsg = [ 'copyrightwarning2',
                '[[' . wfMessage( 'copyrightpage' )->inContentLanguage()->text() . ']]' ];
        }
        // Allow for site and per-namespace customization of contribution/copyright notice.
        Hooks::run( 'EditPageCopyrightWarning', [ $title, &$copywarnMsg ] );
 
        $msg = wfMessage( ...$copywarnMsg )->title( $title );
        if ( $langcode ) {
            $msg->inLanguage( $langcode );
        }
        return "<div id=\"editpage-copywarn\">\n" .
            $msg->$format() . "\n</div>";
    }
 
    public static function getPreviewLimitReport( ParserOutput $output = null ) {
        global $wgLang;
 
        if ( !$output || !$output->getLimitReportData() ) {
            return '';
        }
 
        $limitReport = Html::rawElement( 'div', [ 'class' => 'mw-limitReportExplanation' ],
            wfMessage( 'limitreport-title' )->parseAsBlock()
        );
 
        // Show/hide animation doesn't work correctly on a table, so wrap it in a div.
        $limitReport .= Html::openElement( 'div', [ 'class' => 'preview-limit-report-wrapper' ] );
 
        $limitReport .= Html::openElement( 'table', [
            'class' => 'preview-limit-report wikitable'
        ] ) .
            Html::openElement( 'tbody' );
 
        foreach ( $output->getLimitReportData() as $key => $value ) {
            if ( Hooks::run( 'ParserLimitReportFormat',
                [ $key, &$value, &$limitReport, true, true ]
            ) ) {
                $keyMsg = wfMessage( $key );
                $valueMsg = wfMessage( [ "$key-value-html", "$key-value" ] );
                if ( !$valueMsg->exists() ) {
                    $valueMsg = new RawMessage( '$1' );
                }
                if ( !$keyMsg->isDisabled() && !$valueMsg->isDisabled() ) {
                    $limitReport .= Html::openElement( 'tr' ) .
                        Html::rawElement( 'th', null, $keyMsg->parse() ) .
                        Html::rawElement( 'td', null,
                            $wgLang->formatNum( $valueMsg->params( $value )->parse() )
                        ) .
                        Html::closeElement( 'tr' );
                }
            }
        }
 
        $limitReport .= Html::closeElement( 'tbody' ) .
            Html::closeElement( 'table' ) .
            Html::closeElement( 'div' );
 
        return $limitReport;
    }
 
    protected function showStandardInputs( &$tabindex = 2 ) {
        $out = $this->context->getOutput();
        $out->addHTML( "<div class='editOptions'>\n" );
 
        if ( $this->section != 'new' ) {
            $this->showSummaryInput( false, $this->summary );
            $out->addHTML( $this->getSummaryPreview( false, $this->summary ) );
        }
 
        $checkboxes = $this->getCheckboxesWidget(
            $tabindex,
            [ 'minor' => $this->minoredit, 'watch' => $this->watchthis ]
        );
        $checkboxesHTML = new OOUI\HorizontalLayout( [ 'items' => $checkboxes ] );
 
        $out->addHTML( "<div class='editCheckboxes'>" . $checkboxesHTML . "</div>\n" );
 
        // Show copyright warning.
        $out->addWikiTextAsInterface( $this->getCopywarn() );
        $out->addHTML( $this->editFormTextAfterWarn );
 
        $out->addHTML( "<div class='editButtons'>\n" );
        $out->addHTML( implode( "\n", $this->getEditButtons( $tabindex ) ) . "\n" );
 
        $cancel = $this->getCancelLink();
 
        $message = $this->context->msg( 'edithelppage' )->inContentLanguage()->text();
        $edithelpurl = Skin::makeInternalOrExternalUrl( $message );
        $edithelp =
            Html::linkButton(
                $this->context->msg( 'edithelp' )->text(),
                [ 'target' => 'helpwindow', 'href' => $edithelpurl ],
                [ 'mw-ui-quiet' ]
            ) .
            $this->context->msg( 'word-separator' )->escaped() .
            $this->context->msg( 'newwindow' )->parse();
 
        $out->addHTML( "    <span class='cancelLink'>{$cancel}</span>\n" );
        $out->addHTML( "    <span class='editHelp'>{$edithelp}</span>\n" );
        $out->addHTML( "</div><!-- editButtons -->\n" );
 
        Hooks::run( 'EditPage::showStandardInputs:options', [ $this, $out, &$tabindex ] );
 
        $out->addHTML( "</div><!-- editOptions -->\n" );
    }
 
    protected function showConflict() {
        $out = $this->context->getOutput();
        // Avoid PHP 7.1 warning of passing $this by reference
        $editPage = $this;
        if ( Hooks::run( 'EditPageBeforeConflictDiff', [ &$editPage, &$out ] ) ) {
            $this->incrementConflictStats();
 
            $this->getEditConflictHelper()->showEditFormTextAfterFooters();
        }
    }
 
    protected function incrementConflictStats() {
        $this->getEditConflictHelper()->incrementConflictStats();
    }
 
    public function getCancelLink() {
        $cancelParams = [];
        if ( !$this->isConflict && $this->oldid > 0 ) {
            $cancelParams['oldid'] = $this->oldid;
        } elseif ( $this->getContextTitle()->isRedirect() ) {
            $cancelParams['redirect'] = 'no';
        }
 
        return new OOUI\ButtonWidget( [
            'id' => 'mw-editform-cancel',
            'href' => $this->getContextTitle()->getLinkURL( $cancelParams ),
            'label' => new OOUI\HtmlSnippet( $this->context->msg( 'cancel' )->parse() ),
            'framed' => false,
            'infusable' => true,
            'flags' => 'destructive',
        ] );
    }
 
    protected function getActionURL( Title $title ) {
        return $title->getLocalURL( [ 'action' => $this->action ] );
    }
 
    protected function wasDeletedSinceLastEdit() {
        if ( $this->deletedSinceEdit !== null ) {
            return $this->deletedSinceEdit;
        }
 
        $this->deletedSinceEdit = false;
 
        if ( !$this->mTitle->exists() && $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;
    }
 
    protected function getLastDelete() {
        $dbr = wfGetDB( DB_REPLICA );
        $commentQuery = CommentStore::getStore()->getJoin( 'log_comment' );
        $actorQuery = ActorMigration::newMigration()->getJoin( 'log_user' );
        $data = $dbr->selectRow(
            array_merge( [ 'logging' ], $commentQuery['tables'], $actorQuery['tables'], [ 'user' ] ),
            [
                'log_type',
                'log_action',
                'log_timestamp',
                'log_namespace',
                'log_title',
                'log_params',
                'log_deleted',
                'user_name'
            ] + $commentQuery['fields'] + $actorQuery['fields'],
            [
                'log_namespace' => $this->mTitle->getNamespace(),
                'log_title' => $this->mTitle->getDBkey(),
                'log_type' => 'delete',
                'log_action' => 'delete',
            ],
            __METHOD__,
            [ 'LIMIT' => 1, 'ORDER BY' => 'log_timestamp DESC' ],
            [
                'user' => [ 'JOIN', 'user_id=' . $actorQuery['fields']['log_user'] ],
            ] + $commentQuery['joins'] + $actorQuery['joins']
        );
        // Quick paranoid permission checks...
        if ( is_object( $data ) ) {
            if ( $data->log_deleted & LogPage::DELETED_USER ) {
                $data->user_name = $this->context->msg( 'rev-deleted-user' )->escaped();
            }
 
            if ( $data->log_deleted & LogPage::DELETED_COMMENT ) {
                $data->log_comment_text = $this->context->msg( 'rev-deleted-comment' )->escaped();
                $data->log_comment_data = null;
            }
        }
 
        return $data;
    }
 
    public function getPreviewText() {
        $out = $this->context->getOutput();
        $config = $this->context->getConfig();
 
        if ( $config->get( 'RawHtml' ) && !$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 = Html::rawElement( 'div', [ 'class' => 'previewnote' ],
                    $out->parseAsInterface(
                        $this->context->msg( 'session_fail_preview_html' )->plain()
                    ) );
            }
            $this->incrementEditFailureStats( 'session_loss' );
            return $parsedNote;
        }
 
        $note = '';
 
        try {
            $content = $this->toEditContent( $this->textbox1 );
 
            $previewHTML = '';
            if ( !Hooks::run(
                'AlternateEditPreview',
                [ $this, &$content, &$previewHTML, &$this->mParserOutput ] )
            ) {
                return $previewHTML;
            }
 
            # provide a anchor link to the editform
            $continueEditing = '<span class="mw-continue-editing">' .
                '[[#' . self::EDITFORM_ID . '|' .
                $this->context->getLanguage()->getArrow() . ' ' .
                $this->context->msg( 'continue-editing' )->text() . ']]</span>';
            if ( $this->mTriedSave && !$this->mTokenOk ) {
                if ( $this->mTokenOkExceptSuffix ) {
                    $note = $this->context->msg( 'token_suffix_mismatch' )->plain();
                    $this->incrementEditFailureStats( 'bad_token' );
                } else {
                    $note = $this->context->msg( 'session_fail_preview' )->plain();
                    $this->incrementEditFailureStats( 'session_loss' );
                }
            } elseif ( $this->incompleteForm ) {
                $note = $this->context->msg( 'edit_form_incomplete' )->plain();
                if ( $this->mTriedSave ) {
                    $this->incrementEditFailureStats( 'incomplete_form' );
                }
            } else {
                $note = $this->context->msg( 'previewnote' )->plain() . ' ' . $continueEditing;
            }
 
            # don't parse non-wikitext pages, show message about preview
            if ( $this->mTitle->isUserConfigPage() || $this->mTitle->isSiteConfigPage() ) {
                if ( $this->mTitle->isUserConfigPage() ) {
                    $level = 'user';
                } elseif ( $this->mTitle->isSiteConfigPage() ) {
                    $level = 'site';
                } else {
                    $level = false;
                }
 
                if ( $content->getModel() == CONTENT_MODEL_CSS ) {
                    $format = 'css';
                    if ( $level === 'user' && !$config->get( 'AllowUserCss' ) ) {
                        $format = false;
                    }
                } elseif ( $content->getModel() == CONTENT_MODEL_JSON ) {
                    $format = 'json';
                    if ( $level === 'user' /* No comparable 'AllowUserJson' */ ) {
                        $format = false;
                    }
                } elseif ( $content->getModel() == CONTENT_MODEL_JAVASCRIPT ) {
                    $format = 'js';
                    if ( $level === 'user' && !$config->get( 'AllowUserJs' ) ) {
                        $format = false;
                    }
                } else {
                    $format = false;
                }
 
                # Used messages to make sure grep find them:
                # Messages: usercsspreview, userjsonpreview, userjspreview,
                #   sitecsspreview, sitejsonpreview, sitejspreview
                if ( $level && $format ) {
                    $note = "<div id='mw-{$level}{$format}preview'>" .
                        $this->context->msg( "{$level}{$format}preview" )->plain() .
                        ' ' . $continueEditing . "</div>";
                }
            }
 
            # If we're adding a comment, we need to show the
            # summary as the headline
            if ( $this->section === "new" && $this->summary !== "" ) {
                $content = $content->addSectionHeader( $this->summary );
            }
 
            $hook_args = [ $this, &$content ];
            Hooks::run( 'EditPageGetPreviewContent', $hook_args );
 
            $parserResult = $this->doPreviewParse( $content );
            $parserOutput = $parserResult['parserOutput'];
            $previewHTML = $parserResult['html'];
            $this->mParserOutput = $parserOutput;
            $out->addParserOutputMetadata( $parserOutput );
            if ( $out->userCanPreview() ) {
                $out->addContentOverride( $this->getTitle(), $content );
            }
 
            if ( count( $parserOutput->getWarnings() ) ) {
                $note .= "\n\n" . implode( "\n\n", $parserOutput->getWarnings() );
            }
 
        } catch ( MWContentSerializationException $ex ) {
            $m = $this->context->msg(
                'content-failed-to-parse',
                $this->contentModel,
                $this->contentFormat,
                $ex->getMessage()
            );
            $note .= "\n\n" . $m->plain(); # gets parsed down below
            $previewHTML = '';
        }
 
        if ( $this->isConflict ) {
            $conflict = Html::rawElement(
                'h2', [ 'id' => 'mw-previewconflict' ],
                $this->context->msg( 'previewconflict' )->escaped()
            );
        } else {
            $conflict = '<hr />';
        }
 
        $previewhead = Html::rawElement(
            'div', [ 'class' => 'previewnote' ],
            Html::rawElement(
                'h2', [ 'id' => 'mw-previewheader' ],
                $this->context->msg( 'preview' )->escaped()
            ) .
            $out->parseAsInterface( $note ) . $conflict
        );
 
        $pageViewLang = $this->mTitle->getPageViewLanguage();
        $attribs = [ 'lang' => $pageViewLang->getHtmlCode(), 'dir' => $pageViewLang->getDir(),
            'class' => 'mw-content-' . $pageViewLang->getDir() ];
        $previewHTML = Html::rawElement( 'div', $attribs, $previewHTML );
 
        return $previewhead . $previewHTML . $this->previewTextAfterContent;
    }
 
    private function incrementEditFailureStats( $failureType ) {
        $stats = MediaWikiServices::getInstance()->getStatsdDataFactory();
        $stats->increment( 'edit.failures.' . $failureType );
    }
 
    protected function getPreviewParserOptions() {
        $parserOptions = $this->page->makeParserOptions( $this->context );
        $parserOptions->setIsPreview( true );
        $parserOptions->setIsSectionPreview( !is_null( $this->section ) && $this->section !== '' );
        $parserOptions->enableLimitReport();
 
        // XXX: we could call $parserOptions->setCurrentRevisionCallback here to force the
        // current revision to be null during PST, until setupFakeRevision is called on
        // the ParserOptions. Currently, we rely on Parser::getRevisionObject() to ignore
        // existing revisions in preview mode.
 
        return $parserOptions;
    }
 
    protected function doPreviewParse( Content $content ) {
        $user = $this->context->getUser();
        $parserOptions = $this->getPreviewParserOptions();
 
        // NOTE: preSaveTransform doesn't have a fake revision to operate on.
        // Parser::getRevisionObject() will return null in preview mode,
        // causing the context user to be used for {{subst:REVISIONUSER}}.
        // XXX: Alternatively, we could also call setupFakeRevision() a second time:
        // once before PST with $content, and then after PST with $pstContent.
        $pstContent = $content->preSaveTransform( $this->mTitle, $user, $parserOptions );
        $scopedCallback = $parserOptions->setupFakeRevision( $this->mTitle, $pstContent, $user );
        $parserOutput = $pstContent->getParserOutput( $this->mTitle, null, $parserOptions );
        ScopedCallback::consume( $scopedCallback );
        return [
            'parserOutput' => $parserOutput,
            'html' => $parserOutput->getText( [
                'enableSectionEditLinks' => false
            ] )
        ];
    }
 
    public function getTemplates() {
        if ( $this->preview || $this->section != '' ) {
            $templates = [];
            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->mTitle->getTemplateLinksFrom();
        }
    }
 
    public static function getEditToolbar( $title = null ) {
        $startingToolbar = '<div id="toolbar"></div>';
        $toolbar = $startingToolbar;
 
        if ( !Hooks::run( 'EditPageBeforeEditToolbar', [ &$toolbar ] ) ) {
            return null;
        };
        // Don't add a pointless `<div>` to the page unless a hook caller populated it
        return ( $toolbar === $startingToolbar ) ? null : $toolbar;
    }
 
    public function getCheckboxesDefinition( $checked ) {
        $checkboxes = [];
 
        $user = $this->context->getUser();
        // don't show the minor edit checkbox if it's a new page or section
        if ( !$this->isNew && $user->isAllowed( 'minoredit' ) ) {
            $checkboxes['wpMinoredit'] = [
                'id' => 'wpMinoredit',
                'label-message' => 'minoredit',
                // Uses messages: tooltip-minoredit, accesskey-minoredit
                'tooltip' => 'minoredit',
                'label-id' => 'mw-editpage-minoredit',
                'legacy-name' => 'minor',
                'default' => $checked['minor'],
            ];
        }
 
        if ( $user->isLoggedIn() ) {
            $checkboxes['wpWatchthis'] = [
                'id' => 'wpWatchthis',
                'label-message' => 'watchthis',
                // Uses messages: tooltip-watch, accesskey-watch
                'tooltip' => 'watch',
                'label-id' => 'mw-editpage-watch',
                'legacy-name' => 'watch',
                'default' => $checked['watch'],
            ];
        }
 
        $editPage = $this;
        Hooks::run( 'EditPageGetCheckboxesDefinition', [ $editPage, &$checkboxes ] );
 
        return $checkboxes;
    }
 
    public function getCheckboxesWidget( &$tabindex, $checked ) {
        $checkboxes = [];
        $checkboxesDef = $this->getCheckboxesDefinition( $checked );
 
        foreach ( $checkboxesDef as $name => $options ) {
            $legacyName = $options['legacy-name'] ?? $name;
 
            $title = null;
            $accesskey = null;
            if ( isset( $options['tooltip'] ) ) {
                $accesskey = $this->context->msg( "accesskey-{$options['tooltip']}" )->text();
                $title = Linker::titleAttrib( $options['tooltip'] );
            }
            if ( isset( $options['title-message'] ) ) {
                $title = $this->context->msg( $options['title-message'] )->text();
            }
 
            $checkboxes[ $legacyName ] = new OOUI\FieldLayout(
                new OOUI\CheckboxInputWidget( [
                    'tabIndex' => ++$tabindex,
                    'accessKey' => $accesskey,
                    'id' => $options['id'] . 'Widget',
                    'inputId' => $options['id'],
                    'name' => $name,
                    'selected' => $options['default'],
                    'infusable' => true,
                ] ),
                [
                    'align' => 'inline',
                    'label' => new OOUI\HtmlSnippet( $this->context->msg( $options['label-message'] )->parse() ),
                    'title' => $title,
                    'id' => $options['label-id'] ?? null,
                ]
            );
        }
 
        return $checkboxes;
    }
 
    protected function getSubmitButtonLabel() {
        $labelAsPublish =
            $this->context->getConfig()->get( 'EditSubmitButtonLabelPublish' );
 
        // Can't use $this->isNew as that's also true if we're adding a new section to an extant page
        $newPage = !$this->mTitle->exists();
 
        if ( $labelAsPublish ) {
            $buttonLabelKey = $newPage ? 'publishpage' : 'publishchanges';
        } else {
            $buttonLabelKey = $newPage ? 'savearticle' : 'savechanges';
        }
 
        return $buttonLabelKey;
    }
 
    public function getEditButtons( &$tabindex ) {
        $buttons = [];
 
        $labelAsPublish =
            $this->context->getConfig()->get( 'EditSubmitButtonLabelPublish' );
 
        $buttonLabel = $this->context->msg( $this->getSubmitButtonLabel() )->text();
        $buttonTooltip = $labelAsPublish ? 'publish' : 'save';
 
        $buttons['save'] = new OOUI\ButtonInputWidget( [
            'name' => 'wpSave',
            'tabIndex' => ++$tabindex,
            'id' => 'wpSaveWidget',
            'inputId' => 'wpSave',
            // Support: IE 6 – Use <input>, otherwise it can't distinguish which button was clicked
            'useInputTag' => true,
            'flags' => [ 'progressive', 'primary' ],
            'label' => $buttonLabel,
            'infusable' => true,
            'type' => 'submit',
            // Messages used: tooltip-save, tooltip-publish
            'title' => Linker::titleAttrib( $buttonTooltip ),
            // Messages used: accesskey-save, accesskey-publish
            'accessKey' => Linker::accesskey( $buttonTooltip ),
        ] );
 
        $buttons['preview'] = new OOUI\ButtonInputWidget( [
            'name' => 'wpPreview',
            'tabIndex' => ++$tabindex,
            'id' => 'wpPreviewWidget',
            'inputId' => 'wpPreview',
            // Support: IE 6 – Use <input>, otherwise it can't distinguish which button was clicked
            'useInputTag' => true,
            'label' => $this->context->msg( 'showpreview' )->text(),
            'infusable' => true,
            'type' => 'submit',
            // Message used: tooltip-preview
            'title' => Linker::titleAttrib( 'preview' ),
            // Message used: accesskey-preview
            'accessKey' => Linker::accesskey( 'preview' ),
        ] );
 
        $buttons['diff'] = new OOUI\ButtonInputWidget( [
            'name' => 'wpDiff',
            'tabIndex' => ++$tabindex,
            'id' => 'wpDiffWidget',
            'inputId' => 'wpDiff',
            // Support: IE 6 – Use <input>, otherwise it can't distinguish which button was clicked
            'useInputTag' => true,
            'label' => $this->context->msg( 'showdiff' )->text(),
            'infusable' => true,
            'type' => 'submit',
            // Message used: tooltip-diff
            'title' => Linker::titleAttrib( 'diff' ),
            // Message used: accesskey-diff
            'accessKey' => Linker::accesskey( 'diff' ),
        ] );
 
        // Avoid PHP 7.1 warning of passing $this by reference
        $editPage = $this;
        Hooks::run( 'EditPageBeforeEditButtons', [ &$editPage, &$buttons, &$tabindex ] );
 
        return $buttons;
    }
 
    public function noSuchSectionPage() {
        $out = $this->context->getOutput();
        $out->prepareErrorPage( $this->context->msg( 'nosuchsectiontitle' ) );
 
        $res = $this->context->msg( 'nosuchsectiontext', $this->section )->parseAsBlock();
 
        // Avoid PHP 7.1 warning of passing $this by reference
        $editPage = $this;
        Hooks::run( 'EditPageNoSuchSection', [ &$editPage, &$res ] );
        $out->addHTML( $res );
 
        $out->returnToMain( false, $this->mTitle );
    }
 
    public function spamPageWithContent( $match = false ) {
        $this->textbox2 = $this->textbox1;
 
        if ( is_array( $match ) ) {
            $match = $this->context->getLanguage()->listToText( $match );
        }
        $out = $this->context->getOutput();
        $out->prepareErrorPage( $this->context->msg( 'spamprotectiontitle' ) );
 
        $out->addHTML( '<div id="spamprotected">' );
        $out->addWikiMsg( 'spamprotectiontext' );
        if ( $match ) {
            $out->addWikiMsg( 'spamprotectionmatch', wfEscapeWikiText( $match ) );
        }
        $out->addHTML( '</div>' );
 
        $out->wrapWikiMsg( '<h2>$1</h2>', "yourdiff" );
        $this->showDiff();
 
        $out->wrapWikiMsg( '<h2>$1</h2>', "yourtext" );
        $this->showTextbox2();
 
        $out->addReturnTo( $this->getContextTitle(), [ 'action' => 'edit' ] );
    }
 
    protected function safeUnicodeInput( $request, $field ) {
        return rtrim( $request->getText( $field ) );
    }
 
    protected function safeUnicodeOutput( $text ) {
        return $text;
    }
 
    protected function addEditNotices() {
        $out = $this->context->getOutput();
        $editNotices = $this->mTitle->getEditNotices( $this->oldid );
        if ( count( $editNotices ) ) {
            $out->addHTML( implode( "\n", $editNotices ) );
        } else {
            $msg = $this->context->msg( 'editnotice-notext' );
            if ( !$msg->isDisabled() ) {
                $out->addHTML(
                    '<div class="mw-editnotice-notext">'
                    . $msg->parseAsBlock()
                    . '</div>'
                );
            }
        }
    }
 
    protected function addTalkPageText() {
        if ( $this->mTitle->isTalkPage() ) {
            $this->context->getOutput()->addWikiMsg( 'talkpagetext' );
        }
    }
 
    protected function addLongPageWarningHeader() {
        if ( $this->contentLength === false ) {
            $this->contentLength = strlen( $this->textbox1 );
        }
 
        $out = $this->context->getOutput();
        $lang = $this->context->getLanguage();
        $maxArticleSize = $this->context->getConfig()->get( 'MaxArticleSize' );
        if ( $this->tooBig || $this->contentLength > $maxArticleSize * 1024 ) {
            $out->wrapWikiMsg( "<div class='error' id='mw-edit-longpageerror'>\n$1\n</div>",
                [
                    'longpageerror',
                    $lang->formatNum( round( $this->contentLength / 1024, 3 ) ),
                    $lang->formatNum( $maxArticleSize )
                ]
            );
        } elseif ( !$this->context->msg( 'longpage-hint' )->isDisabled() ) {
            $out->wrapWikiMsg( "<div id='mw-edit-longpage-hint'>\n$1\n</div>",
                [
                    'longpage-hint',
                    $lang->formatSize( strlen( $this->textbox1 ) ),
                    strlen( $this->textbox1 )
                ]
            );
        }
    }
 
    protected function addPageProtectionWarningHeaders() {
        $out = $this->context->getOutput();
        if ( $this->mTitle->isProtected( 'edit' ) &&
            MWNamespace::getRestrictionLevels( $this->mTitle->getNamespace() ) !== [ '' ]
        ) {
            # 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( $out, 'protect', $this->mTitle, '',
                [ 'lim' => 1, 'msgKey' => [ $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>';
            $out->wrapWikiMsg( $notice, [ 'cascadeprotectedwarning', $cascadeSourcesCount ] );
        }
        if ( !$this->mTitle->exists() && $this->mTitle->getRestrictions( 'create' ) ) {
            LogEventsList::showLogExtract( $out, 'protect', $this->mTitle, '',
                [ 'lim' => 1,
                    'showIfEmpty' => false,
                    'msgKey' => [ 'titleprotectedwarning' ],
                    'wrap' => "<div class=\"mw-titleprotectedwarning\">\n$1</div>" ] );
        }
    }
 
    protected function addExplainConflictHeader( OutputPage $out ) {
        $out->addHTML(
            $this->getEditConflictHelper()->getExplainHeader()
        );
    }
 
    protected function buildTextboxAttribs( $name, array $customAttribs, User $user ) {
        return ( new TextboxBuilder() )->buildTextboxAttribs(
            $name, $customAttribs, $user, $this->mTitle
        );
    }
 
    protected function addNewLineAtEnd( $wikitext ) {
        return ( new TextboxBuilder() )->addNewLineAtEnd( $wikitext );
    }
 
    private function guessSectionName( $text ) {
        global $wgParser;
 
        // Detect Microsoft browsers
        $userAgent = $this->context->getRequest()->getHeader( 'User-Agent' );
        if ( $userAgent && preg_match( '/MSIE|Edge/', $userAgent ) ) {
            // ...and redirect them to legacy encoding, if available
            return $wgParser->guessLegacySectionNameFromWikiText( $text );
        }
        // Meanwhile, real browsers get real anchors
        $name = $wgParser->guessSectionNameFromWikiText( $text );
        // With one little caveat: per T216029, fragments in HTTP redirects need to be urlencoded,
        // otherwise Chrome double-escapes the rest of the URL.
        return '#' . urlencode( mb_substr( $name, 1 ) );
    }
 
    public function setEditConflictHelperFactory( callable $factory ) {
        $this->editConflictHelperFactory = $factory;
        $this->editConflictHelper = null;
    }
 
    private function getEditConflictHelper() {
        if ( !$this->editConflictHelper ) {
            $this->editConflictHelper = call_user_func(
                $this->editConflictHelperFactory,
                $this->getSubmitButtonLabel()
            );
        }
 
        return $this->editConflictHelper;
    }
 
    private function newTextConflictHelper( $submitButtonLabel ) {
        return new TextConflictHelper(
            $this->getTitle(),
            $this->getContext()->getOutput(),
            MediaWikiServices::getInstance()->getStatsdDataFactory(),
            $submitButtonLabel
        );
    }
}