EditPage.php

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<?php
namespace MediaWiki\EditPage;
 
use BadMethodCallException;
use MediaWiki\Actions\WatchAction;
use MediaWiki\Auth\AuthManager;
use MediaWiki\Cache\LinkBatchFactory;
use MediaWiki\CommentStore\CommentStore;
use MediaWiki\CommentStore\CommentStoreComment;
use MediaWiki\Config\Config;
use MediaWiki\Content\Content;
use MediaWiki\Content\ContentHandler;
use MediaWiki\Content\IContentHandlerFactory;
use MediaWiki\Content\TextContent;
use MediaWiki\Context\DerivativeContext;
use MediaWiki\Context\IContextSource;
use MediaWiki\Debug\DeprecationHelper;
use MediaWiki\EditPage\Constraint\AccidentalRecreationConstraint;
use MediaWiki\EditPage\Constraint\AuthorizationConstraint;
use MediaWiki\EditPage\Constraint\ChangeTagsConstraint;
use MediaWiki\EditPage\Constraint\ContentModelChangeConstraint;
use MediaWiki\EditPage\Constraint\DefaultTextConstraint;
use MediaWiki\EditPage\Constraint\EditConstraintFactory;
use MediaWiki\EditPage\Constraint\EditConstraintRunner;
use MediaWiki\EditPage\Constraint\EditFilterMergedContentHookConstraint;
use MediaWiki\EditPage\Constraint\ExistingSectionEditConstraint;
use MediaWiki\EditPage\Constraint\IEditConstraint;
use MediaWiki\EditPage\Constraint\ImageRedirectConstraint;
use MediaWiki\EditPage\Constraint\MissingCommentConstraint;
use MediaWiki\EditPage\Constraint\NewSectionMissingSubjectConstraint;
use MediaWiki\EditPage\Constraint\PageSizeConstraint;
use MediaWiki\EditPage\Constraint\RedirectConstraint;
use MediaWiki\EditPage\Constraint\SpamRegexConstraint;
use MediaWiki\EditPage\Constraint\UnicodeConstraint;
use MediaWiki\Exception\ErrorPageError;
use MediaWiki\Exception\MWContentSerializationException;
use MediaWiki\Exception\MWException;
use MediaWiki\Exception\MWUnknownContentModelException;
use MediaWiki\Exception\PermissionsError;
use MediaWiki\Exception\ReadOnlyError;
use MediaWiki\Exception\ThrottledError;
use MediaWiki\Exception\UserBlockedError;
use MediaWiki\HookContainer\HookRunner;
use MediaWiki\HookContainer\ProtectedHookAccessorTrait;
use MediaWiki\Html\Html;
use MediaWiki\Language\RawMessage;
use MediaWiki\Linker\Linker;
use MediaWiki\Linker\LinkRenderer;
use MediaWiki\Logger\LoggerFactory;
use MediaWiki\Logging\LogPage;
use MediaWiki\Logging\ManualLogEntry;
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
use MediaWiki\Message\Message;
use MediaWiki\Page\Article;
use MediaWiki\Page\CategoryPage;
use MediaWiki\Page\PageIdentity;
use MediaWiki\Page\PageReference;
use MediaWiki\Page\RedirectLookup;
use MediaWiki\Page\WikiPage;
use MediaWiki\Parser\ParserOptions;
use MediaWiki\Parser\ParserOutput;
use MediaWiki\Parser\ParserOutputLinkTypes;
use MediaWiki\Permissions\Authority;
use MediaWiki\Permissions\PermissionManager;
use MediaWiki\Permissions\PermissionStatus;
use MediaWiki\Permissions\RestrictionStore;
use MediaWiki\RecentChanges\RecentChange;
use MediaWiki\Request\WebRequest;
use MediaWiki\Revision\RevisionRecord;
use MediaWiki\Revision\RevisionStore;
use MediaWiki\Revision\RevisionStoreRecord;
use MediaWiki\Revision\SlotRecord;
use MediaWiki\Session\SessionManager;
use MediaWiki\Skin\Skin;
use MediaWiki\Status\Status;
use MediaWiki\Storage\EditResult;
use MediaWiki\Storage\PageUpdateCauses;
use MediaWiki\Title\Title;
use MediaWiki\User\ExternalUserNames;
use MediaWiki\User\Options\UserOptionsLookup;
use MediaWiki\User\Registration\UserRegistrationLookup;
use MediaWiki\User\TempUser\CreateStatus;
use MediaWiki\User\TempUser\TempUserCreator;
use MediaWiki\User\User;
use MediaWiki\User\UserFactory;
use MediaWiki\User\UserIdentity;
use MediaWiki\Watchlist\WatchedItem;
use MediaWiki\Watchlist\WatchedItemStoreInterface;
use MediaWiki\Watchlist\WatchlistManager;
use MessageLocalizer;
use OOUI;
use OOUI\ButtonWidget;
use OOUI\CheckboxInputWidget;
use OOUI\DropdownInputWidget;
use OOUI\FieldLayout;
use RuntimeException;
use stdClass;
use Wikimedia\Assert\Assert;
use Wikimedia\Message\MessageValue;
use Wikimedia\ParamValidator\TypeDef\ExpiryDef;
use Wikimedia\Rdbms\IConnectionProvider;
use Wikimedia\Rdbms\IDBAccessObject;
use Wikimedia\Rdbms\SelectQueryBuilder;
use Wikimedia\Timestamp\ConvertibleTimestamp;
use Wikimedia\Timestamp\TimestampFormat as TS;
 
#[\AllowDynamicProperties]
class EditPage implements IEditObject {
    use DeprecationHelper;
    use ProtectedHookAccessorTrait;
 
    public const UNICODE_CHECK = UnicodeConstraint::VALID_UNICODE;
 
    public const EDITFORM_ID = 'editform';
 
    public const POST_EDIT_COOKIE_KEY_PREFIX = 'PostEditRevision';
 
    public const POST_EDIT_COOKIE_DURATION = 1200;
 
    private $mArticle;
 
    private $page;
 
    private $mTitle;
 
    private $mContextTitle = null;
 
    private $action = 'submit';
 
    public $isConflict = false;
 
    private $isNew = false;
 
    private $deletedSinceEdit;
 
    public $formtype;
 
    public $firsttime;
 
    private $lastDelete;
 
    private $mTokenOk = false;
 
    private $mTriedSave = false;
 
    private $incompleteForm = false;
 
    private $missingSummary = false;
 
    private $allowBlankSummary = false;
 
    protected $blankArticle = false;
 
    private $allowBlankArticle = false;
 
    private $problematicRedirectTarget = null;
 
    private $allowedProblematicRedirectTarget = null;
 
    private $ignoreProblematicRedirects = false;
 
    private $autoSumm = '';
 
    private $hookError = '';
 
    private $mParserOutput;
 
    private $mExpectedParentRevision = false;
 
    public $mShowSummaryField = true;
 
    # Form values
 
    public $save = false;
 
    public $preview = false;
 
    private $diff = false;
 
    private $minoredit = false;
 
    private $watchthis = false;
 
    private $watchlistExpiryEnabled;
 
    private WatchedItemStoreInterface $watchedItemStore;
 
    private $watchlistExpiry;
 
    private $recreate = false;
 
    public $textbox1 = '';
 
    private $textbox2 = '';
 
    public $summary = '';
 
    private $nosummary = false;
 
    public $edittime = '';
 
    private $editRevId = null;
 
    public $section = '';
 
    public $sectiontitle = null;
 
    private $newSectionAnchor = null;
 
    public $starttime = '';
 
    public $oldid = 0;
 
    private $parentRevId = 0;
 
    private $scrolltop = null;
 
    private $markAsBot = 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 $didSave = false;
    public $undidRev = 0;
    private $undoAfter = 0;
 
    public $suppressIntro = false;
 
    private $edit;
 
    private $contentLength = false;
 
    private $enableApiEditOverride = false;
 
    protected $context;
 
    private $isOldRev = false;
 
    private $unicodeCheck;
 
    private $editConflictHelperFactory = null;
    private ?TextConflictHelper $editConflictHelper = null;
 
    private IContentHandlerFactory $contentHandlerFactory;
    private PermissionManager $permManager;
    private RevisionStore $revisionStore;
    private WatchlistManager $watchlistManager;
    private RedirectLookup $redirectLookup;
    private UserOptionsLookup $userOptionsLookup;
    private TempUserCreator $tempUserCreator;
    private UserFactory $userFactory;
    private IConnectionProvider $dbProvider;
    private AuthManager $authManager;
    private UserRegistrationLookup $userRegistrationLookup;
    private SessionManager $sessionManager;
 
    private $placeholderTempUser;
 
    private $unsavedTempUser;
 
    private $savedTempUser;
 
    private $tempUserCreateActive = false;
 
    private $tempUserName;
 
    private $tempUserCreateDone = false;
 
    private $unableToAcquireTempName = false;
 
    private LinkRenderer $linkRenderer;
    private LinkBatchFactory $linkBatchFactory;
    private RestrictionStore $restrictionStore;
    private CommentStore $commentStore;
 
    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();
 
        $services = MediaWikiServices::getInstance();
        $this->contentHandlerFactory = $services->getContentHandlerFactory();
        $this->contentFormat = $this->contentHandlerFactory
            ->getContentHandler( $this->contentModel )
            ->getDefaultFormat();
        $this->permManager = $services->getPermissionManager();
        $this->revisionStore = $services->getRevisionStore();
        $this->watchlistExpiryEnabled = $this->getContext()->getConfig() instanceof Config
            && $this->getContext()->getConfig()->get( MainConfigNames::WatchlistExpiry );
        $this->watchedItemStore = $services->getWatchedItemStore();
        $this->watchlistManager = $services->getWatchlistManager();
        $this->redirectLookup = $services->getRedirectLookup();
        $this->userOptionsLookup = $services->getUserOptionsLookup();
        $this->tempUserCreator = $services->getTempUserCreator();
        $this->userFactory = $services->getUserFactory();
        $this->linkRenderer = $services->getLinkRenderer();
        $this->linkBatchFactory = $services->getLinkBatchFactory();
        $this->restrictionStore = $services->getRestrictionStore();
        $this->commentStore = $services->getCommentStore();
        $this->dbProvider = $services->getConnectionProvider();
        $this->authManager = $services->getAuthManager();
        $this->userRegistrationLookup = $services->getUserRegistrationLookup();
        $this->sessionManager = $services->getSessionManager();
 
        $this->deprecatePublicProperty( 'textbox2', '1.44', __CLASS__ );
        $this->deprecatePublicProperty( 'action', '1.38', __CLASS__ );
    }
 
    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 ( $this->mContextTitle === null ) {
            throw new RuntimeException( "EditPage does not have a context title set" );
        } else {
            return $this->mContextTitle;
        }
    }
 
    private function isSupportedContentModel( string $modelId ): bool {
        return $this->enableApiEditOverride === true ||
            $this->contentHandlerFactory->getContentHandler( $modelId )->supportsDirectEditing();
    }
 
    public function setApiEditOverride( $enableOverride ) {
        $this->enableApiEditOverride = $enableOverride;
    }
 
    public function edit() {
        // Allow extensions to modify/prevent this form or submission
        if ( !$this->getHookRunner()->onAlternateEdit( $this ) ) {
            return;
        }
 
        wfDebug( __METHOD__ . ": enter" );
 
        $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;
 
        $readOnlyMode = MediaWikiServices::getInstance()->getReadOnlyMode();
        if ( $this->save && $readOnlyMode->isReadOnly() ) {
            // 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';
            }
        }
 
        // Check permissions after possibly creating a placeholder temp user.
        // This allows anonymous users to edit via a temporary account, if the site is
        // configured to (1) disallow anonymous editing and (2) autocreate temporary
        // accounts on edit.
        $this->unableToAcquireTempName = !$this->maybeActivateTempUserCreate( !$this->firsttime )->isOK();
 
        $status = $this->getEditPermissionStatus(
            $this->save ? PermissionManager::RIGOR_SECURE : PermissionManager::RIGOR_FULL
        );
        if ( !$status->isGood() ) {
            wfDebug( __METHOD__ . ": User can't edit" );
 
            $user = $this->context->getUser();
            if ( $user->getBlock() && !$readOnlyMode->isReadOnly() ) {
                // Auto-block user's IP if the account was "hard" blocked
                $user->scheduleSpreadBlock();
            }
            $this->displayPermissionStatus( $status );
 
            return;
        }
 
        $revRecord = $this->mArticle->fetchRevisionRecord();
        // Disallow editing revisions with content models different from the current one
        // Undo edits being an exception in order to allow reverting content model changes.
        $revContentModel = $revRecord ?
            $revRecord->getMainContentModel() :
            false;
        if ( $revContentModel && $revContentModel !== $this->contentModel ) {
            $prevRevRecord = null;
            $prevContentModel = false;
            if ( $this->undidRev ) {
                $undidRevRecord = $this->revisionStore
                    ->getRevisionById( $this->undidRev );
                $prevRevRecord = $undidRevRecord ?
                    $this->revisionStore->getPreviousRevision( $undidRevRecord ) :
                    null;
 
                $prevContentModel = $prevRevRecord ?
                    $prevRevRecord->getMainContentModel() :
                    '';
            }
 
            if ( !$this->undidRev
                || !$prevRevRecord
                || $prevContentModel !== $this->contentModel
            ) {
                $this->displayViewSourcePage(
                    $this->getContentObject(),
                    $this->context->msg(
                        'contentmodelediterror',
                        $revContentModel,
                        $this->contentModel
                    )->plain()
                );
                return;
            }
        }
 
        $this->isConflict = false;
 
        # 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() ) {
                return;
            }
 
            if ( $this->mTitle->getArticleID() ) {
                $this->getHookRunner()->onEditFormInitialText( $this );
            }
        }
 
        // If we're displaying an old revision, and there are differences between it and the
        // current revision outside the main slot, then we can't allow the old revision to be
        // editable, as what would happen to the non-main-slot data if someone saves the old
        // revision is undefined.
        // When this is the case, display a read-only version of the page instead, with a link
        // to a diff page from which the old revision can be restored
        $curRevisionRecord = $this->page->getRevisionRecord();
        if ( $curRevisionRecord
            && $revRecord
            && $curRevisionRecord->getId() !== $revRecord->getId()
            && ( WikiPage::hasDifferencesOutsideMainSlot(
                    $revRecord,
                    $curRevisionRecord
                ) || !$this->isSupportedContentModel(
                    $revRecord->getSlot(
                        SlotRecord::MAIN,
                        RevisionRecord::RAW
                    )->getModel()
                ) )
        ) {
            $restoreLink = $this->mTitle->getFullURL(
                [
                    'action' => 'mcrrestore',
                    'restore' => $revRecord->getId(),
                ]
            );
            $this->displayViewSourcePage(
                $this->getContentObject(),
                $this->context->msg(
                    'nonmain-slot-differences-therefore-readonly',
                    $restoreLink
                )->plain()
            );
            return;
        }
 
        $this->showEditForm();
    }
 
    public function maybeActivateTempUserCreate( $doAcquire ): Status {
        if ( $this->tempUserCreateActive ) {
            // Already done
            return Status::newGood();
        }
        $user = $this->context->getUser();
 
        // Log out any user using an expired temporary account, so that we can give them a new temporary account.
        // As described in T389485, we need to do this because the maintenance script to expire temporary accounts
        // may fail to run or not be configured to run.
        if ( $user->isTemp() ) {
            $expiryAfterDays = $this->tempUserCreator->getExpireAfterDays();
            if ( $expiryAfterDays ) {
                $expirationCutoff = (int)ConvertibleTimestamp::now( TS::UNIX ) - ( 86_400 * $expiryAfterDays );
 
                // If the user was created before the expiration cutoff, then log them out, expire any other existing
                // sessions, and revoke any access to the account that may exist.
                // If no registration is set then do nothing, as if registration date system is broken it would
                // cause a new temporary account for each edit.
                $firstUserRegistration = $this->userRegistrationLookup->getFirstRegistration( $user );
                if (
                    $firstUserRegistration &&
                    ConvertibleTimestamp::convert( TS::UNIX, $firstUserRegistration ) < $expirationCutoff
                ) {
                    // Log the user out of the expired temporary account.
                    $user->logout();
 
                    // Clear any stashed temporary account name (if any is set), as we want a new name for the user.
                    $session = $this->context->getRequest()->getSession();
                    $session->set( 'TempUser:name', null );
                    $session->save();
 
                    // Invalidate any sessions for the expired temporary account
                    $this->sessionManager->invalidateSessionsForUser(
                        $this->userFactory->newFromUserIdentity( $user )
                    );
                }
            }
        }
 
        if ( $this->tempUserCreator->shouldAutoCreate( $user, 'edit' ) ) {
            if ( $doAcquire ) {
                $name = $this->tempUserCreator->acquireAndStashName(
                    $this->context->getRequest()->getSession() );
                if ( $name === null ) {
                    $status = Status::newFatal( 'temp-user-unable-to-acquire' );
                    $status->value = self::AS_UNABLE_TO_ACQUIRE_TEMP_ACCOUNT;
                    return $status;
                }
                $this->unsavedTempUser = $this->userFactory->newUnsavedTempUser( $name );
                $this->tempUserName = $name;
            } else {
                $this->placeholderTempUser = $this->userFactory->newTempPlaceholder();
            }
            $this->tempUserCreateActive = true;
        }
        return Status::newGood();
    }
 
    private function createTempUser(): Status {
        if ( !$this->tempUserCreateActive ) {
            return Status::newGood();
        }
        $request = $this->context->getRequest();
        $status = $this->tempUserCreator->create(
            $this->tempUserName,
            $request
        );
        if ( $status->isOK() ) {
            $this->placeholderTempUser = null;
            $this->unsavedTempUser = null;
            $this->savedTempUser = $status->getUser();
            $this->authManager->setRequestContextUserFromSessionUser();
            $this->tempUserCreateDone = true;
        }
        LoggerFactory::getInstance( 'authevents' )->info(
            'Temporary account creation attempt: {user}',
            [
                'user' => $this->tempUserName,
                'success' => $status->isOK(),
            ] + $request->getSecurityLogContext( $status->isOK() ? $status->getUser() : null )
        );
        return $status;
    }
 
    private function getAuthority(): Authority {
        return $this->getUserForPermissions();
    }
 
    private function getUserForPermissions() {
        if ( $this->savedTempUser ) {
            return $this->savedTempUser;
        } elseif ( $this->unsavedTempUser ) {
            return $this->unsavedTempUser;
        } elseif ( $this->placeholderTempUser ) {
            return $this->placeholderTempUser;
        } else {
            return $this->context->getUser();
        }
    }
 
    private function getUserForPreview() {
        if ( $this->savedTempUser ) {
            return $this->savedTempUser;
        } elseif ( $this->unsavedTempUser ) {
            return $this->unsavedTempUser;
        } elseif ( $this->firsttime && $this->placeholderTempUser ) {
            // Mostly a GET request and no temp user was aquired,
            // but needed for pst or content transform for preview,
            // fallback to a placeholder for this situation (T330943)
            return $this->placeholderTempUser;
        } elseif ( $this->tempUserCreateActive ) {
            throw new BadMethodCallException(
                "Can't use the request user for preview with IP masking enabled" );
        } else {
            return $this->context->getUser();
        }
    }
 
    private function getUserForSave() {
        if ( $this->savedTempUser ) {
            return $this->savedTempUser;
        } elseif ( $this->tempUserCreateActive ) {
            throw new BadMethodCallException(
                "Can't use the request user for storage with IP masking enabled" );
        } else {
            return $this->context->getUser();
        }
    }
 
    private function getEditPermissionStatus( string $rigor = PermissionManager::RIGOR_SECURE ): PermissionStatus {
        $user = $this->getUserForPermissions();
        return $this->permManager->getPermissionStatus(
            'edit',
            $user,
            $this->mTitle,
            $rigor
        );
    }
 
    private function displayPermissionStatus( PermissionStatus $status ): void {
        $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:
        // page or section does not exist (T249978), and the user isn't in the middle of an edit
        if ( !$content || ( $this->firsttime && !$this->mTitle->exists() && $content->isEmpty() ) ) {
            $action = $this->mTitle->exists() ? 'edit' :
                ( $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage' );
            throw new PermissionsError( $action, $status );
        }
 
        $this->displayViewSourcePage(
            $content,
            $out->formatPermissionStatus( $status, 'edit' )
        );
    }
 
    private function displayViewSourcePage( Content $content, string $errorMessage ): void {
        $out = $this->context->getOutput();
        $this->getHookRunner()->onEditPage__showReadOnlyForm_initial( $this, $out );
 
        $out->setRobotPolicy( 'noindex,nofollow' );
        $out->setPageTitleMsg( $this->context->msg(
            'viewsource-title'
        )->plaintextParams(
            $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 ) {
                # 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( MainConfigNames::PreviewOnOpenNamespaces );
        $request = $this->context->getRequest();
        if ( $config->get( MainConfigNames::RawHtml ) ) {
            // If raw HTML is enabled, disable preview on open
            // since it has to be posted with a token for
            // security reasons
            return false;
        }
        $preview = $request->getRawVal( 'preview' );
        if ( $preview === 'yes' ) {
            // Explicit override from request
            return true;
        } elseif ( $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->userOptionsLookup->getOption( $this->context->getUser(), 'previewonfirst' )
        ) {
            // Standard preference behavior
            return true;
        } elseif ( !$this->mTitle->exists()
            && isset( $previewOnOpenNamespaces[$this->mTitle->getNamespace()] )
            && $previewOnOpenNamespaces[$this->mTitle->getNamespace()]
        ) {
            // Categories are special
            return true;
        } else {
            return false;
        }
    }
 
    private function isSectionEditSupported(): bool {
        $currentRev = $this->page->getRevisionRecord();
 
        // $currentRev is null for non-existing pages, use the page default content model.
        $revContentModel = $currentRev
            ? $currentRev->getMainContentModel()
            : $this->page->getContentModel();
 
        return (
            ( $this->mArticle->getRevIdFetched() === $this->page->getLatest() ) &&
            $this->contentHandlerFactory->getContentHandler( $revContentModel )->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() ) {
            $this->importFormDataPosted( $request );
        } else {
            # Not a posted form? Start with nothing.
            wfDebug( __METHOD__ . ": Not a posted form." );
            $this->textbox1 = '';
            $this->summary = '';
            $this->sectiontitle = null;
            $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 );
            if ( $this->watchlistExpiryEnabled ) {
                $this->watchlistExpiry = null;
            }
            $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->getCheck( 'preloadtitle' ) ) {
                $this->sectiontitle = $request->getVal( 'preloadtitle' );
                $this->setNewSectionSummary();
            } elseif ( $this->section !== 'new' && $request->getRawVal( 'summary' ) !== '' ) {
                $this->summary = $request->getText( 'summary' );
                if ( $this->summary !== '' ) {
                    // 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( '' );
                }
            }
 
            if ( $request->getVal( 'minor' ) ) {
                $this->minoredit = true;
            }
        }
 
        $this->oldid = $request->getInt( 'oldid' );
        $this->parentRevId = $request->getInt( 'parentRevId' );
 
        $this->markAsBot = $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 = $this->contentHandlerFactory->getContentHandler( $this->contentModel );
        } catch ( MWUnknownContentModelException ) {
            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 ) )
                ]
            );
        }
 
        // Allow extensions to modify form data
        $this->getHookRunner()->onEditPage__importFormData( $this, $request );
    }
 
    private function importFormDataPosted( WebRequest $request ): void {
        # 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' );
 
        if ( $this->section === 'new' ) {
            # Allow setting sectiontitle different from the edit 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).
            if ( $request->getCheck( 'wpSectionTitle' ) ) {
                $this->sectiontitle = $request->getText( 'wpSectionTitle' );
                if ( $request->getCheck( 'wpSummary' ) ) {
                    $this->summary = $request->getText( 'wpSummary' );
                }
            } else {
                $this->sectiontitle = $request->getText( 'wpSummary' );
            }
        } else {
            $this->sectiontitle = null;
            $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. (T3600)
        # It is weird to modify 'sectiontitle', even when it is provided when using the API, but API
        # users have come to rely on it: https://github.com/wikimedia-gadgets/twinkle/issues/1625
        $this->summary = preg_replace( '/^\s*=+\s*(.*?)\s*=+\s*$/', '$1', $this->summary );
        if ( $this->sectiontitle !== null ) {
            $this->sectiontitle = preg_replace( '/^\s*=+\s*(.*?)\s*=+\s*$/', '$1', $this->sectiontitle );
        }
 
        // @phan-suppress-next-line PhanSuspiciousValueComparison
        if ( $this->section === 'new' ) {
            $this->setNewSectionSummary();
        }
 
        $this->edittime = $request->getVal( 'wpEdittime' );
        $this->editRevId = $request->getIntOrNull( 'editRevId' );
        $this->starttime = $request->getVal( 'wpStarttime' );
 
        $undidRev = $request->getInt( 'wpUndidRevision' );
        if ( $undidRev ) {
            $this->undidRev = $undidRev;
        }
        $undoAfter = $request->getInt( 'wpUndoAfter' );
        if ( $undoAfter ) {
            $this->undoAfter = $undoAfter;
        }
 
        $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 that may have been configured
            // for security reasons.
            $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" );
            wfDebug( "POST DATA: " . var_export( $request->getPostValues(), true ) );
            $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." );
            } elseif ( $this->diff ) {
                # Failed token check, but only requested "Show Changes".
                wfDebug( __METHOD__ . ": Failed token check; Show Changes requested." );
            } else {
                # Page might be a hack attempt posted from
                # an external site. Preview instead of saving.
                wfDebug( __METHOD__ . ": Failed token check; forcing preview" );
                $this->preview = true;
            }
        }
        $this->save = !$this->preview && !$this->diff;
        if ( !$this->edittime || !preg_match( '/^\d{14}$/', $this->edittime ) ) {
            $this->edittime = null;
        }
 
        if ( !$this->starttime || !preg_match( '/^\d{14}$/', $this->starttime ) ) {
            $this->starttime = null;
        }
 
        $this->recreate = $request->getCheck( 'wpRecreate' );
 
        $user = $this->context->getUser();
 
        $this->minoredit = $request->getCheck( 'wpMinoredit' );
        $this->watchthis = $request->getCheck( 'wpWatchthis' );
        $submittedExpiry = $request->getText( 'wpWatchlistExpiry' );
        if ( $this->watchlistExpiryEnabled && $submittedExpiry !== '' ) {
            // This parsing of the user-posted expiry is done for both preview and saving. This
            // is necessary because ApiEditPage uses preview when it saves (yuck!). Note that it
            // only works because the unnormalized value is retrieved again below in
            // getCheckboxesDefinitionForWatchlist().
            $submittedExpiry = ExpiryDef::normalizeExpiry( $submittedExpiry, TS::ISO_8601 );
            if ( $submittedExpiry !== false ) {
                $this->watchlistExpiry = $submittedExpiry;
            }
        }
 
        # Don't force edit summaries when a user is editing their own user or talk page
        if ( ( $this->mTitle->getNamespace() === NS_USER || $this->mTitle->getNamespace() === NS_USER_TALK )
            && $this->mTitle->getText() === $user->getName()
        ) {
            $this->allowBlankSummary = true;
        } else {
            $this->allowBlankSummary = $request->getBool( 'wpIgnoreBlankSummary' )
                || !$this->userOptionsLookup->getOption( $user, 'forceeditsummary' );
        }
 
        $this->autoSumm = $request->getText( 'wpAutoSummary' );
 
        $this->allowBlankArticle = $request->getBool( 'wpIgnoreBlankArticle' );
        $allowedProblematicRedirectTargetText = $request->getText( 'wpAllowedProblematicRedirectTarget' );
        $this->allowedProblematicRedirectTarget = $allowedProblematicRedirectTargetText === ''
            ? null : Title::newFromText( $allowedProblematicRedirectTargetText );
        $this->ignoreProblematicRedirects = $request->getBool( 'wpIgnoreProblematicRedirects' );
 
        $changeTags = $request->getVal( 'wpChangeTags' );
        $changeTagsAfterPreview = $request->getVal( 'wpChangeTagsAfterPreview' );
        if ( $changeTags === null || $changeTags === '' ) {
            $this->changeTags = [];
        } else {
            $this->changeTags = array_filter(
                array_map(
                    'trim',
                    explode( ',', $changeTags )
                )
            );
        }
        if ( $changeTagsAfterPreview !== null && $changeTagsAfterPreview !== '' ) {
            $this->changeTags = array_merge( $this->changeTags, array_filter(
                array_map(
                    'trim',
                    explode( ',', $changeTagsAfterPreview )
                )
            ) );
        }
    }
 
    protected function importContentFormData( &$request ) {
        return null; // Don't do anything, EditPage already extracted wpTextbox1
    }
 
    private function initialiseForm(): bool {
        $this->edittime = $this->page->getTimestamp();
        $this->editRevId = $this->page->getLatest();
 
        $dummy = $this->contentHandlerFactory
            ->getContentHandler( $this->contentModel )
            ->makeEmptyContent();
        $content = $this->getContentObject( $dummy ); # TODO: track content object?!
        if ( $content === $dummy ) { // Invalid section
            $this->noSuchSectionPage();
            return false;
        }
 
        if ( !$content ) {
            $out = $this->context->getOutput();
            // FIXME Why is this double-parsing?
            $this->editFormPageTop .= Html::errorBox(
                $out->parseAsInterface( $this->context->msg( 'missing-revision-content',
                    $this->oldid,
                    Message::plaintextParam( $this->mTitle->getPrefixedText() )
                )->parse() )
            );
        } elseif ( !$this->isSupportedContentModel( $content->getModel() ) ) {
            $modelMsg = $this->getContext()->msg( 'content-model-' . $content->getModel() );
            $modelName = $modelMsg->exists() ? $modelMsg->text() : $content->getModel();
 
            $out = $this->context->getOutput();
            $out->showErrorPage(
                'modeleditnotsupported-title',
                'modeleditnotsupported-text',
                [ $modelName ]
            );
            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 ( $this->userOptionsLookup->getOption( $user, 'watchdefault' ) ) {
            # Watch all edits
            $this->watchthis = true;
        } elseif ( $this->userOptionsLookup->getOption( $user, 'watchcreations' ) && !$this->mTitle->exists() ) {
            # Watch creations
            $this->watchthis = true;
        } elseif ( $this->watchlistManager->isWatched( $user, $this->mTitle ) ) {
            # Already watched
            $this->watchthis = true;
        }
        if ( $this->watchthis && $this->watchlistExpiryEnabled ) {
            $watchedItem = $this->watchedItemStore->getWatchedItem( $user, $this->getTitle() );
            $this->watchlistExpiry = $watchedItem ? $watchedItem->getExpiry() : null;
        }
        if ( !$this->isNew && $this->userOptionsLookup->getOption( $user, 'minordefault' ) ) {
            $this->minoredit = true;
        }
        if ( $this->textbox1 === false ) {
            return false;
        }
        return true;
    }
 
    protected function getContentObject( $defaultContent = null ) {
        $services = MediaWikiServices::getInstance();
        $request = $this->context->getRequest();
 
        $content = false;
 
        // For non-existent articles and new sections, use preload text if any.
        if ( !$this->mTitle->exists() || $this->section === 'new' ) {
            $content = $services->getPreloadedContentBuilder()->getPreloadedContent(
                $this->mTitle->toPageIdentity(),
                $this->context->getUser(),
                $request->getVal( 'preload' ),
                $request->getArray( 'preloadparams', [] ),
                $request->getVal( 'section' )
            );
        // 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( $this->getAuthority() );
            $content = $orig ? $orig->getSection( $this->section ) : null;
 
            if ( !$content ) {
                $content = $defaultContent;
            }
        } else {
            $undoafter = $request->getInt( 'undoafter' );
            $undo = $request->getInt( 'undo' );
 
            if ( $undo > 0 && $undoafter > 0 ) {
                // The use of getRevisionByTitle() is intentional, as allowing access to
                // arbitrary revisions on arbitrary pages bypass partial visibility restrictions (T297322).
                $undorev = $this->revisionStore->getRevisionByTitle( $this->mTitle, $undo );
                $oldrev = $this->revisionStore->getRevisionByTitle( $this->mTitle, $undoafter );
                $undoMsg = null;
 
                # Make sure it's the right page,
                # the revisions exist and they were not deleted.
                # Otherwise, $content will be left as-is.
                if ( $undorev !== null && $oldrev !== null &&
                    !$undorev->isDeleted( RevisionRecord::DELETED_TEXT ) &&
                    !$oldrev->isDeleted( RevisionRecord::DELETED_TEXT )
                ) {
                    if ( WikiPage::hasDifferencesOutsideMainSlot( $undorev, $oldrev )
                        || !$this->isSupportedContentModel(
                            $oldrev->getMainContentModel()
                        )
                    ) {
                        // 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->getUndoContent( $undorev, $oldrev, $undoMsg );
                    }
 
                    if ( $undoMsg === null ) {
                        $oldContent = $this->page->getContent( RevisionRecord::RAW );
                        $parserOptions = ParserOptions::newFromUserAndLang(
                            $this->getUserForPreview(),
                            $services->getContentLanguage()
                        );
                        $contentTransformer = $services->getContentTransformer();
                        $newContent = $contentTransformer->preSaveTransform(
                            $content, $this->mTitle, $this->getUserForPreview(), $parserOptions
                        );
 
                        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();
                            $oldMainSlot = $oldrev->getSlot(
                                SlotRecord::MAIN,
                                RevisionRecord::RAW
                            );
                            $this->contentFormat = $oldMainSlot->getFormat();
                            if ( $this->contentFormat === null ) {
                                $this->contentFormat = $this->contentHandlerFactory
                                    ->getContentHandler( $oldMainSlot->getModel() )
                                    ->getDefaultFormat();
                            }
                        }
 
                        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';
                            $this->generateUndoEditSummary( $oldrev, $undo, $undorev, $services );
                            $this->undidRev = $undo;
                            $this->undoAfter = $undoafter;
                            $this->formtype = 'diff';
                        }
                    }
                } else {
                    // Failed basic 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.
                $class = "mw-undo-{$undoMsg}";
                $html = $this->context->msg( 'undo-' . $undoMsg )->parse();
                if ( $undoMsg !== 'success' ) {
                    $html = Html::errorBox( $html );
                }
                $this->editFormPageTop .= Html::rawElement(
                    'div',
                    [ 'class' => $class ],
                    $html
                );
            }
 
            if ( $content === false ) {
                $content = $this->getOriginalContent( $this->getAuthority() );
            }
        }
 
        return $content;
    }
 
    private function generateUndoEditSummary( ?RevisionRecord $oldrev, int $undo,
        ?RevisionRecord $undorev, MediaWikiServices $services
    ) {
        // Generate an autosummary
        $firstrev = $this->revisionStore->getNextRevision( $oldrev );
        // Undid just one revision
        if ( $firstrev && $firstrev->getId() == $undo ) {
            $userText = $undorev->getUser() ?
                $undorev->getUser()->getName() :
                '';
            if ( $userText === '' ) {
                $undoSummary = $this->context->msg(
                    'undo-summary-username-hidden',
                    $undo
                )->inContentLanguage()->text();
            // Handle external users (imported revisions)
            } elseif ( ExternalUserNames::isExternal( $userText ) ) {
                $userLinkTitle = ExternalUserNames::getUserLinkTitle( $userText );
                if ( $userLinkTitle ) {
                    $userLink = $userLinkTitle->getPrefixedText();
                    $undoSummary = $this->context->msg(
                        'undo-summary-import',
                        $undo,
                        $userLink,
                        $userText
                    )->inContentLanguage()->text();
                } else {
                    $undoSummary = $this->context->msg(
                        'undo-summary-import2',
                        $undo,
                        $userText
                    )->inContentLanguage()->text();
                }
            } else {
                $undoIsAnon =
                    !$undorev->getUser() ||
                    !$undorev->getUser()->isRegistered();
                $disableAnonTalk = $services->getMainConfig()->get( MainConfigNames::DisableAnonTalk );
                $undoMessage = ( $undoIsAnon && $disableAnonTalk ) ?
                    'undo-summary-anon' :
                    'undo-summary';
                $undoSummary = $this->context->msg(
                    $undoMessage,
                    $undo,
                    $userText
                )->inContentLanguage()->text();
            }
            if ( $this->summary === '' ) {
                $this->summary = $undoSummary;
            } else {
                $this->summary = $undoSummary . $this->context->msg( 'colon-separator' )
                    ->inContentLanguage()->text() . $this->summary;
            }
        // Undid multiple revisions
        } else {
            $firstRevisionId = $firstrev->getId();
            $lastRevisionId = $undorev->getId();
            $revisionCount = $services->getRevisionStore()->countRevisionsBetween(
                $firstrev->getPageId(),
                $firstrev,
                $undorev,
                null,
                [ RevisionStore::INCLUDE_BOTH, RevisionStore::INCLUDE_DELETED_REVISIONS ]
            );
            $undoSummary = $this->context->msg( 'undo-summary-multiple' )
                ->numParams( $revisionCount )
                ->params( $firstRevisionId, $lastRevisionId )
                ->inContentLanguage()
                ->text();
            if ( $this->summary === '' ) {
                $this->summary = $undoSummary;
            } else {
                $this->summary = $undoSummary . $this->context->msg( 'colon-separator' )
                    ->inContentLanguage()->text() . $this->summary;
            }
        }
    }
 
    private function getUndoContent( RevisionRecord $undoRev, RevisionRecord $oldRev, &$error ) {
        $handler = $this->contentHandlerFactory
            ->getContentHandler( $undoRev->getSlot(
                SlotRecord::MAIN,
                RevisionRecord::RAW
            )->getModel() );
        $currentContent = $this->page->getRevisionRecord()
            ->getContent( SlotRecord::MAIN );
        $undoContent = $undoRev->getContent( SlotRecord::MAIN );
        $undoAfterContent = $oldRev->getContent( SlotRecord::MAIN );
        $undoIsLatest = $this->page->getRevisionRecord()->getId() === $undoRev->getId();
        if ( $currentContent === null
            || $undoContent === null
            || $undoAfterContent === null
        ) {
            $error = 'norev';
            return false;
        }
 
        $content = $handler->getUndoContent(
            $currentContent,
            $undoContent,
            $undoAfterContent,
            $undoIsLatest
        );
        if ( $content === false ) {
            $error = 'failure';
        }
        return $content;
    }
 
    private function getOriginalContent( Authority $performer ): ?Content {
        if ( $this->section === 'new' ) {
            return $this->getCurrentContent();
        }
        $revRecord = $this->mArticle->fetchRevisionRecord();
        if ( $revRecord === null ) {
            return $this->contentHandlerFactory
                ->getContentHandler( $this->contentModel )
                ->makeEmptyContent();
        }
        return $revRecord->getContent( SlotRecord::MAIN, RevisionRecord::FOR_THIS_USER, $performer );
    }
 
    private function getParentRevId() {
        if ( $this->parentRevId ) {
            return $this->parentRevId;
        } else {
            return $this->mArticle->getRevIdFetched();
        }
    }
 
    protected function getCurrentContent() {
        $revRecord = $this->page->getRevisionRecord();
        $content = $revRecord ? $revRecord->getContent(
            SlotRecord::MAIN,
            RevisionRecord::RAW
        ) : null;
 
        if ( $content === null ) {
            return $this->contentHandlerFactory
                ->getContentHandler( $this->contentModel )
                ->makeEmptyContent();
        }
 
        return $content;
    }
 
    private function tokenOk( WebRequest $request ): bool {
        $token = $request->getVal( 'wpEditToken' );
        $user = $this->context->getUser();
        $this->mTokenOk = $user->matchEditToken( $token );
        return $this->mTokenOk;
    }
 
    private function setPostEditCookie( int $statusValue ): void {
        $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';
        }
        if ( $this->tempUserCreateDone ) {
            $val .= '+tempuser';
        }
 
        $response = $this->context->getRequest()->response();
        $response->setCookie( $postEditKey, $val, time() + self::POST_EDIT_COOKIE_DURATION );
    }
 
    public function attemptSave( &$resultDetails = false ) {
        // Allow bots to exempt some edits from bot flagging
        $markAsBot = $this->markAsBot
            && $this->getAuthority()->isAllowed( 'bot' );
 
        // Allow trusted users to mark some edits as minor
        $markAsMinor = $this->minoredit && !$this->isNew
            && $this->getAuthority()->isAllowed( 'minoredit' );
 
        $status = $this->internalAttemptSave( $resultDetails, $markAsBot, $markAsMinor );
 
        $this->getHookRunner()->onEditPage__attemptSave_after( $this, $status, $resultDetails );
 
        return $status;
    }
 
    private function incrementResolvedConflicts(): void {
        if ( $this->context->getRequest()->getText( 'mode' ) !== 'conflict' ) {
            return;
        }
 
        $this->getEditConflictHelper()->incrementResolvedStats( $this->context->getUser() );
    }
 
    private function handleStatus( Status $status, $resultDetails ): bool {
        $statusValue = is_int( $status->value ) ? $status->value : 0;
 
        if ( $statusValue === self::AS_SUCCESS_UPDATE
            || $statusValue === self::AS_SUCCESS_NEW_ARTICLE
        ) {
            $this->incrementResolvedConflicts();
 
            $this->didSave = true;
            if ( !$resultDetails['nullEdit'] ) {
                $this->setPostEditCookie( $statusValue );
            }
        }
 
        $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 ( $statusValue ) {
            // Status codes for which the error/warning message is generated somewhere else in this class.
            // They should be refactored to provide their own messages and handled below (T384399).
            case self::AS_HOOK_ERROR_EXPECTED:
            case self::AS_ARTICLE_WAS_DELETED:
            case self::AS_CONFLICT_DETECTED:
            case self::AS_SUMMARY_NEEDED:
            case self::AS_END:
            case self::AS_REVISION_WAS_DELETED:
                return true;
 
            case self::AS_HOOK_ERROR:
                return false;
 
            // Status codes that provide their own error/warning messages. Most error scenarios that don't
            // need custom user interface (e.g. edit conflicts) should be handled here, one day (T384399).
            case self::AS_BLANK_ARTICLE:
            case self::AS_BROKEN_REDIRECT:
            case self::AS_DOUBLE_REDIRECT:
            case self::AS_DOUBLE_REDIRECT_LOOP:
            case self::AS_CONTENT_TOO_BIG:
            case self::AS_INVALID_REDIRECT_TARGET:
            case self::AS_MAX_ARTICLE_SIZE_EXCEEDED:
            case self::AS_PARSE_ERROR:
            case self::AS_SELF_REDIRECT:
            case self::AS_TEXTBOX_EMPTY:
            case self::AS_UNABLE_TO_ACQUIRE_TEMP_ACCOUNT:
            case self::AS_UNICODE_NOT_SUPPORTED:
                foreach ( $status->getMessages() as $msg ) {
                    $out->addHTML( Html::errorBox(
                        $this->context->msg( $msg )->parse()
                    ) );
                }
                return true;
 
            case self::AS_SUCCESS_NEW_ARTICLE:
                $queryParts = [];
                if ( $resultDetails['redirect'] ) {
                    $queryParts[] = 'redirect=no';
                }
                if ( $extraQueryRedirect ) {
                    $queryParts[] = $extraQueryRedirect;
                }
                $anchor = $resultDetails['sectionanchor'] ?? '';
                $this->doPostEditRedirect( implode( '&', $queryParts ), $anchor );
                return false;
 
            case self::AS_SUCCESS_UPDATE:
                $extraQuery = '';
                $sectionanchor = $resultDetails['sectionanchor'];
                // Give extensions a chance to modify URL query on update
                $this->getHookRunner()->onArticleUpdateBeforeRedirect( $this->mArticle,
                    $sectionanchor, $extraQuery );
 
                $queryParts = [];
                if ( $resultDetails['redirect'] ) {
                    $queryParts[] = 'redirect=no';
                }
                if ( $extraQuery ) {
                    $queryParts[] = $extraQuery;
                }
                if ( $extraQueryRedirect ) {
                    $queryParts[] = $extraQueryRedirect;
                }
                $this->doPostEditRedirect( implode( '&', $queryParts ), $sectionanchor );
                return false;
 
            case self::AS_SPAM_ERROR:
                $this->spamPageWithContent( $resultDetails['spam'] ?? false );
                return false;
 
            case self::AS_BLOCKED_PAGE_FOR_USER:
                throw new UserBlockedError(
                    // @phan-suppress-next-line PhanTypeMismatchArgumentNullable Block is checked and not null
                    $this->context->getUser()->getBlock(),
                    $this->context->getUser(),
                    $this->context->getLanguage(),
                    $request->getIP()
                );
 
            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:
                $out->addHTML( Html::errorBox(
                    $this->context->msg( 'actionthrottledtext' )->parse()
                ) );
                return true;
 
            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 $statusValue. 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 = Html::errorBox(
                    "\n" . $status->getWikiText( false, false, $this->context->getLanguage() )
                );
                return true;
        }
    }
 
    private function doPostEditRedirect( $query, $anchor ) {
        $out = $this->context->getOutput();
        $url = $this->mTitle->getFullURL( $query ) . $anchor;
        $user = $this->getUserForSave();
        // If the temporary account was created in this request,
        // or if the temporary account has zero edits (implying
        // that the account was created during a failed edit
        // attempt in a previous request), perform the top-level
        // redirect to ensure the account is attached.
        // Note that the temp user could already have performed
        // the top-level redirect if this a first edit on
        // a wiki that is not the user's home wiki.
        $shouldRedirectForTempUser = $this->tempUserCreateDone ||
            ( $user->isTemp() && ( $user->getEditCount() === 0 ) );
        if ( $shouldRedirectForTempUser ) {
            $this->getHookRunner()->onTempUserCreatedRedirect(
                $this->context->getRequest()->getSession(),
                $user,
                $this->mTitle->getPrefixedDBkey(),
                $query,
                $anchor,
                $url
            );
        }
        $out->redirect( $url );
    }
 
    private function setNewSectionSummary(): void {
        Assert::precondition( $this->section === 'new', 'This method can only be called for new sections' );
        Assert::precondition( $this->sectiontitle !== null, 'This method can only be called for new sections' );
 
        $services = MediaWikiServices::getInstance();
        $parser = $services->getParser();
        $textFormatter = $services->getMessageFormatterFactory()->getTextFormatter(
            $services->getContentLanguageCode()->toString()
        );
 
        if ( $this->sectiontitle !== '' ) {
            $this->newSectionAnchor = $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 === '' ) {
                $messageValue = MessageValue::new( 'newsectionsummary' )
                    ->plaintextParams( $parser->stripSectionName( $this->sectiontitle ) );
                $this->summary = $textFormatter->format( $messageValue );
            }
        } else {
            $this->newSectionAnchor = '';
        }
    }
 
    private function internalAttemptSave( &$result, $markAsBot = false, $markAsMinor = false ) {
        // If an attempt to acquire a temporary name failed, don't attempt to do anything else.
        if ( $this->unableToAcquireTempName ) {
            $status = Status::newFatal( 'temp-user-unable-to-acquire' );
            $status->value = self::AS_UNABLE_TO_ACQUIRE_TEMP_ACCOUNT;
            return $status;
        }
        // Auto-create the temporary account user, if the feature is enabled.
        // We create the account before any constraint checks or edit hooks fire, to ensure
        // that we have an actor and user account that can be used for any logs generated
        // by the edit attempt, and to ensure continuity in the user experience (if a constraint
        // denies an edit to a logged-out user, that history should be associated with the
        // eventually successful account creation)
        $tempAccountStatus = $this->createTempUser();
        if ( !$tempAccountStatus->isOK() ) {
            return $tempAccountStatus;
        }
        if ( $tempAccountStatus instanceof CreateStatus ) {
            $result['savedTempUser'] = $tempAccountStatus->getUser();
        }
 
        $useNPPatrol = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::UseNPPatrol );
        $useRCPatrol = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::UseRCPatrol );
        if ( !$this->getHookRunner()->onEditPage__attemptSave( $this ) ) {
            wfDebug( "Hook 'EditPage::attemptSave' aborted article saving" );
            $status = Status::newFatal( 'hookaborted' );
            $status->value = self::AS_HOOK_ERROR;
            return $status;
        }
 
        if ( !$this->getHookRunner()->onEditFilter( $this, $this->textbox1, $this->section,
            $this->hookError, $this->summary )
        ) {
            # Error messages etc. could be handled within the hook...
            $status = Status::newFatal( 'hookaborted' );
            $status->value = self::AS_HOOK_ERROR;
            return $status;
        } elseif ( $this->hookError ) {
            # ...or the hook could be expecting us to produce an error
            $status = Status::newFatal( 'hookaborted' );
            $status->value = self::AS_HOOK_ERROR_EXPECTED;
            return $status;
        }
 
        try {
            # Construct Content object
            $textbox_content = $this->toEditContent( $this->textbox1 );
        } catch ( MWContentSerializationException $ex ) {
            $status = Status::newFatal(
                'content-failed-to-parse',
                $this->contentModel,
                $this->contentFormat,
                $ex->getMessage()
            );
            $status->value = self::AS_PARSE_ERROR;
            return $status;
        }
 
        $this->contentLength = strlen( $this->textbox1 );
 
        $requestUser = $this->context->getUser();
        $authority = $this->getAuthority();
        $pstUser = $this->getUserForPreview();
 
        $changingContentModel = false;
        if ( $this->contentModel !== $this->mTitle->getContentModel() ) {
            $changingContentModel = true;
            $oldContentModel = $this->mTitle->getContentModel();
        }
 
        // BEGINNING OF MIGRATION TO EDITCONSTRAINT SYSTEM (see T157658)
        $constraintFactory = MediaWikiServices::getInstance()->getService( '_EditConstraintFactory' );
        $constraintRunner = new EditConstraintRunner();
 
        // Message key of the label of the submit button - used by some constraint error messages
        $submitButtonLabel = $this->getSubmitButtonLabel();
 
        // UnicodeConstraint: ensure that `$this->unicodeCheck` is the correct unicode
        $constraintRunner->addConstraint(
            new UnicodeConstraint( $this->unicodeCheck )
        );
 
        // SimpleAntiSpamConstraint: ensure that the context request does not have
        // `wpAntispam` set
        // Use $user since there is no permissions aspect
        $constraintRunner->addConstraint(
            $constraintFactory->newSimpleAntiSpamConstraint(
                $this->context->getRequest()->getText( 'wpAntispam' ),
                $requestUser,
                $this->mTitle
            )
        );
 
        // SpamRegexConstraint: ensure that the summary and text don't match the spam regex
        $constraintRunner->addConstraint(
            $constraintFactory->newSpamRegexConstraint(
                $this->summary,
                $this->sectiontitle,
                $this->textbox1,
                $this->context->getRequest()->getIP(),
                $this->mTitle
            )
        );
        $constraintRunner->addConstraint(
            new ImageRedirectConstraint(
                $textbox_content,
                $this->mTitle,
                $authority
            )
        );
        $constraintRunner->addConstraint(
            $constraintFactory->newReadOnlyConstraint()
        );
 
        // Load the page data from the primary DB. 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( IDBAccessObject::READ_LATEST );
        $new = !$this->page->exists();
 
        $constraintRunner->addConstraint(
            new AuthorizationConstraint(
                $authority,
                $this->mTitle,
                $new
            )
        );
        $constraintRunner->addConstraint(
            new ContentModelChangeConstraint(
                $authority,
                $this->mTitle,
                $this->contentModel
            )
        );
        $constraintRunner->addConstraint(
            $constraintFactory->newLinkPurgeRateLimitConstraint(
                $requestUser->toRateLimitSubject()
            )
        );
        $constraintRunner->addConstraint(
            // Same constraint is used to check size before and after merging the
            // edits, which use different failure codes
            $constraintFactory->newPageSizeConstraint(
                $this->contentLength,
                PageSizeConstraint::BEFORE_MERGE
            )
        );
        $constraintRunner->addConstraint(
            new ChangeTagsConstraint( $authority, $this->changeTags )
        );
 
        // If the article has been deleted while editing, don't save it without
        // confirmation
        $constraintRunner->addConstraint(
            new AccidentalRecreationConstraint(
                $this->wasDeletedSinceLastEdit(),
                $this->recreate
            )
        );
 
        // Check the constraints
        if ( !$constraintRunner->checkConstraints() ) {
            $failed = $constraintRunner->getFailedConstraint();
 
            // Need to check SpamRegexConstraint here, to avoid needing to pass
            // $result by reference again
            if ( $failed instanceof SpamRegexConstraint ) {
                $result['spam'] = $failed->getMatch();
            } else {
                $this->handleFailedConstraint( $failed );
            }
 
            return Status::wrap( $failed->getLegacyStatus() );
        }
        // END OF MIGRATION TO EDITCONSTRAINT SYSTEM (continued below)
 
        $flags = EDIT_AUTOSUMMARY |
            ( $new ? EDIT_NEW : EDIT_UPDATE ) |
            ( $markAsMinor ? EDIT_MINOR : 0 ) |
            ( $markAsBot ? EDIT_FORCE_BOT : 0 );
 
        if ( $new ) {
            $content = $textbox_content;
 
            $result['sectionanchor'] = '';
            if ( $this->section === 'new' ) {
                if ( $this->sectiontitle !== null ) {
                    // Insert the section title above the content.
                    $content = $content->addSectionHeader( $this->sectiontitle );
                }
                $result['sectionanchor'] = $this->newSectionAnchor;
            }
 
            $pageUpdater = $this->page->newPageUpdater( $pstUser )
                // @phan-suppress-next-line PhanTypeMismatchArgumentNullable False positive
                ->setContent( SlotRecord::MAIN, $content );
            $pageUpdater->prepareUpdate( $flags );
 
            // BEGINNING OF MIGRATION TO EDITCONSTRAINT SYSTEM (see T157658)
            // Create a new runner to avoid rechecking the prior constraints, use the same factory
            $constraintRunner = new EditConstraintRunner();
 
            // 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)
            $constraintRunner->addConstraint(
                new DefaultTextConstraint(
                    $this->mTitle,
                    $this->allowBlankArticle,
                    $this->textbox1,
                    $submitButtonLabel
                )
            );
 
            $constraintRunner->addConstraint(
                $constraintFactory->newEditFilterMergedContentHookConstraint(
                    $content,
                    $this->context,
                    $this->summary,
                    $markAsMinor,
                    $this->context->getLanguage(),
                    $pstUser
                )
            );
 
            // Check the constraints
            if ( !$constraintRunner->checkConstraints() ) {
                $failed = $constraintRunner->getFailedConstraint();
                $this->handleFailedConstraint( $failed );
                return Status::wrap( $failed->getLegacyStatus() );
            }
            // END OF MIGRATION TO EDITCONSTRAINT SYSTEM (continued below)
        } else { # not $new
 
            # Article exists. Check for edit conflict.
 
            $timestamp = $this->page->getTimestamp();
            $latest = $this->page->getLatest();
 
            wfDebug( "timestamp: {$timestamp}, edittime: {$this->edittime}" );
            wfDebug( "revision: {$latest}, editRevId: {$this->editRevId}" );
 
            $editConflictLogger = LoggerFactory::getInstance( 'EditConflict' );
            // 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 ( ( $this->edittime !== null && $this->edittime != $timestamp )
                || ( $this->editRevId !== null && $this->editRevId != $latest )
            ) {
                $this->isConflict = true;
                if ( $this->section === 'new' ) {
                    if ( $this->page->getUserText() === $requestUser->getName() &&
                        $this->page->getComment() === $this->summary
                    ) {
                        // 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.
                        $editConflictLogger->debug(
                            'Duplicate new section submission; trigger edit conflict!'
                        );
                    } else {
                        // New comment; suppress conflict.
                        $this->isConflict = false;
                        $editConflictLogger->debug( 'Conflict suppressed; new section' );
                    }
                } elseif ( $this->section === ''
                    && $this->edittime
                    && $this->revisionStore->userWasLastToEdit(
                        $this->dbProvider->getPrimaryDatabase(),
                        $this->mTitle->getArticleID(),
                        $requestUser->getId(),
                        $this->edittime
                    )
                ) {
                    # Suppress edit conflict with self, except for section edits where merging is required.
                    $editConflictLogger->debug( 'Suppressing edit conflict, same user.' );
                    $this->isConflict = false;
                }
            }
 
            if ( $this->isConflict ) {
                $editConflictLogger->debug(
                    'Conflict! Getting section {section} for time {editTime}'
                    . ' (id {editRevId}, article time {timestamp})',
                    [
                        'section' => $this->section,
                        'editTime' => $this->edittime,
                        'editRevId' => $this->editRevId,
                        'timestamp' => $timestamp,
                    ]
                );
                // @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,
                        $this->sectiontitle,
                        $this->editRevId
                    );
                } else {
                    $content = $this->page->replaceSectionContent(
                        $this->section,
                        $textbox_content,
                        $this->sectiontitle,
                        $this->edittime
                    );
                }
            } else {
                $editConflictLogger->debug(
                    'Getting section {section}',
                    [ 'section' => $this->section ]
                );
                $content = $this->page->replaceSectionAtRev(
                    $this->section,
                    $textbox_content,
                    $this->sectiontitle
                );
            }
 
            if ( $content === null ) {
                $editConflictLogger->debug( 'Activating conflict; section replace failed.' );
                $this->isConflict = true;
                $content = $textbox_content; // do not try to merge here!
            } elseif ( $this->isConflict ) {
                // Attempt merge
                $mergedChange = $this->mergeChangesIntoContent( $content );
                if ( $mergedChange !== false ) {
                    // Successful merge! Maybe we should tell the user the good news?
                    $content = $mergedChange[0];
                    $this->parentRevId = $mergedChange[1];
                    $this->isConflict = false;
                    $editConflictLogger->debug( 'Suppressing edit conflict, successful merge.' );
                } else {
                    $this->section = '';
                    $this->textbox1 = ( $content instanceof TextContent ) ? $content->getText() : '';
                    $editConflictLogger->debug( 'Keeping edit conflict, failed merge.' );
                }
            }
 
            if ( $this->isConflict ) {
                return Status::newGood( self::AS_CONFLICT_DETECTED )->setOK( false );
            }
 
            $pageUpdater = $this->page->newPageUpdater( $pstUser )
                ->setContent( SlotRecord::MAIN, $content );
            $pageUpdater->prepareUpdate( $flags );
 
            // BEGINNING OF MIGRATION TO EDITCONSTRAINT SYSTEM (see T157658)
            // Create a new runner to avoid rechecking the prior constraints, use the same factory
            $constraintRunner = new EditConstraintRunner();
            $constraintRunner->addConstraint(
                $constraintFactory->newEditFilterMergedContentHookConstraint(
                    $content,
                    $this->context,
                    $this->summary,
                    $markAsMinor,
                    $this->context->getLanguage(),
                    $pstUser
                )
            );
            $constraintRunner->addConstraint(
                new NewSectionMissingSubjectConstraint(
                    $this->section,
                    $this->sectiontitle ?? '',
                    $this->allowBlankSummary
                )
            );
            $constraintRunner->addConstraint(
                new MissingCommentConstraint( $this->section, $this->textbox1 )
            );
            $constraintRunner->addConstraint(
                new ExistingSectionEditConstraint(
                    $this->section,
                    $this->summary,
                    $this->autoSumm,
                    $this->allowBlankSummary,
                    $content,
                    $this->getOriginalContent( $authority )
                )
            );
            // Check the constraints
            if ( !$constraintRunner->checkConstraints() ) {
                $failed = $constraintRunner->getFailedConstraint();
                $this->handleFailedConstraint( $failed );
                return Status::wrap( $failed->getLegacyStatus() );
            }
            // END OF MIGRATION TO EDITCONSTRAINT SYSTEM (continued below)
 
            # All's well
            $sectionAnchor = '';
            if ( $this->section === 'new' ) {
                $sectionAnchor = $this->newSectionAnchor;
            } 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 WikiPage::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 && $matches[2] !== '' ) {
                    $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 = '';
        }
 
        // Check for length errors again now that the section is merged in
        $this->contentLength = strlen( $this->toEditText( $content ) );
 
        // BEGINNING OF MIGRATION TO EDITCONSTRAINT SYSTEM (see T157658)
        // Create a new runner to avoid rechecking the prior constraints, use the same factory
        $constraintRunner = new EditConstraintRunner();
        if ( !$this->ignoreProblematicRedirects ) {
            $constraintRunner->addConstraint(
                new RedirectConstraint(
                    $this->allowedProblematicRedirectTarget,
                    $content,
                    $this->getCurrentContent(),
                    $this->getTitle(),
                    $submitButtonLabel,
                    $this->contentFormat,
                    $this->redirectLookup
                )
            );
        }
        $constraintRunner->addConstraint(
            // Same constraint is used to check size before and after merging the
            // edits, which use different failure codes
            $constraintFactory->newPageSizeConstraint(
                $this->contentLength,
                PageSizeConstraint::AFTER_MERGE
            )
        );
        // Check the constraints
        if ( !$constraintRunner->checkConstraints() ) {
            $failed = $constraintRunner->getFailedConstraint();
            $this->handleFailedConstraint( $failed );
            return Status::wrap( $failed->getLegacyStatus() );
        }
        // END OF MIGRATION TO EDITCONSTRAINT SYSTEM
 
        if ( $this->undidRev && $this->isUndoClean( $content ) ) {
            // As the user can change the edit's content before saving, we only mark
            // "clean" undos as reverts. This is to avoid abuse by marking irrelevant
            // edits as undos.
            $pageUpdater
                ->setOriginalRevisionId( $this->undoAfter ?: false )
                ->setCause( PageUpdateCauses::CAUSE_UNDO )
                ->markAsRevert(
                    EditResult::REVERT_UNDO,
                    $this->undidRev,
                    $this->undoAfter ?: null
                );
        }
 
        $needsPatrol = $useRCPatrol || ( $useNPPatrol && !$this->page->exists() );
        if ( $needsPatrol && $authority->authorizeWrite( 'autopatrol', $this->getTitle() ) ) {
            $pageUpdater->setRcPatrolStatus( RecentChange::PRC_AUTOPATROLLED );
        }
 
        $pageUpdater
            ->addTags( $this->changeTags )
            ->saveRevision(
                CommentStoreComment::newUnsavedComment( trim( $this->summary ) ),
                $flags
            );
        $doEditStatus = $pageUpdater->getStatus();
 
        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
            if (
                $doEditStatus->failedBecausePageMissing() ||
                $doEditStatus->failedBecausePageExists() ||
                $doEditStatus->failedBecauseOfConflict()
            ) {
                $this->isConflict = true;
                // Destroys data doEdit() put in $status->value but who cares
                // TODO: We should care, this puts an `int` value into a `Status<array>`
                // @phan-suppress-next-line PhanTypeMismatchPropertyProbablyReal
                $doEditStatus->value = self::AS_END;
            }
            return $doEditStatus;
        }
 
        $result['nullEdit'] = !$doEditStatus->wasRevisionCreated();
        if ( $result['nullEdit'] ) {
            // We didn't know if it was a null edit until now, so bump the rate limit now
            $limitSubject = $requestUser->toRateLimitSubject();
            MediaWikiServices::getInstance()->getRateLimiter()->limit( $limitSubject, 'linkpurge' );
        }
        $result['redirect'] = $content->isRedirect();
 
        $this->updateWatchlist();
 
        // If the content model changed, add a log entry
        if ( $changingContentModel ) {
            $this->addContentModelChangeLogEntry(
                $this->getUserForSave(),
                // @phan-suppress-next-next-line PhanPossiblyUndeclaredVariable
                // $oldContentModel is set when $changingContentModel is true
                $new ? false : $oldContentModel,
                $this->contentModel,
                $this->summary
            );
        }
 
        // Instead of carrying the same status object throughout, it is created right
        // when it is returned, either at an earlier point due to an error or here
        // due to a successful edit.
        $statusCode = ( $new ? self::AS_SUCCESS_NEW_ARTICLE : self::AS_SUCCESS_UPDATE );
        return Status::newGood( $statusCode );
    }
 
    private function handleFailedConstraint( IEditConstraint $failed ): void {
        if ( $failed instanceof AuthorizationConstraint ) {
            // Auto-block user's IP if the account was "hard" blocked
            if (
                !MediaWikiServices::getInstance()->getReadOnlyMode()->isReadOnly()
                && $failed->getLegacyStatus()->value === self::AS_BLOCKED_PAGE_FOR_USER
            ) {
                $this->context->getUser()->spreadAnyEditBlock();
            }
        } elseif ( $failed instanceof DefaultTextConstraint ) {
            $this->blankArticle = true;
        } elseif ( $failed instanceof EditFilterMergedContentHookConstraint ) {
            $this->hookError = $failed->getHookError();
        } elseif (
            // ExistingSectionEditConstraint also checks for revisions deleted
            // since the edit was loaded, which doesn't indicate a missing summary
            (
                $failed instanceof ExistingSectionEditConstraint
                && $failed->getLegacyStatus()->value === self::AS_SUMMARY_NEEDED
            ) ||
            $failed instanceof NewSectionMissingSubjectConstraint
        ) {
            $this->missingSummary = true;
        } elseif ( $failed instanceof RedirectConstraint ) {
            $this->problematicRedirectTarget = $failed->problematicTarget;
        }
    }
 
    private function isUndoClean( Content $content ): bool {
        // Check whether the undo was "clean", that is the user has not modified
        // the automatically generated content.
        $undoRev = $this->revisionStore->getRevisionById( $this->undidRev );
        if ( $undoRev === null ) {
            return false;
        }
 
        if ( $this->undoAfter ) {
            $oldRev = $this->revisionStore->getRevisionById( $this->undoAfter );
        } else {
            $oldRev = $this->revisionStore->getPreviousRevision( $undoRev );
        }
 
        if ( $oldRev === null ||
            $undoRev->isDeleted( RevisionRecord::DELETED_TEXT ) ||
            $oldRev->isDeleted( RevisionRecord::DELETED_TEXT )
        ) {
            return false;
        }
 
        $undoContent = $this->getUndoContent( $undoRev, $oldRev, $undoError );
        if ( !$undoContent ) {
            return false;
        }
 
        // Do a pre-save transform on the retrieved undo content
        $services = MediaWikiServices::getInstance();
        $contentLanguage = $services->getContentLanguage();
        $user = $this->getUserForPreview();
        $parserOptions = ParserOptions::newFromUserAndLang( $user, $contentLanguage );
        $contentTransformer = $services->getContentTransformer();
        $undoContent = $contentTransformer->preSaveTransform( $undoContent, $this->mTitle, $user, $parserOptions );
 
        if ( $undoContent->equals( $content ) ) {
            return true;
        }
        return false;
    }
 
    private function addContentModelChangeLogEntry( UserIdentity $user, $oldModel, $newModel, $reason = "" ): void {
        $new = $oldModel === false;
        $log = new ManualLogEntry( 'contentmodel', $new ? 'new' : 'change' );
        $log->setPerformer( $user );
        $log->setTarget( $this->mTitle );
        $log->setComment( is_string( $reason ) ? $reason : "" );
        $log->setParameters( [
            '4::oldmodel' => $oldModel,
            '5::newmodel' => $newModel
        ] );
        $logid = $log->insert();
        $log->publish( $logid );
    }
 
    private function updateWatchlist(): void {
        if ( $this->tempUserCreateActive ) {
            return;
        }
        $user = $this->getUserForSave();
        if ( !$user->isNamed() ) {
            return;
        }
 
        $title = $this->mTitle;
        $watch = $this->watchthis;
        $watchlistExpiry = $this->watchlistExpiry;
 
        // This can't run as a DeferredUpdate due to a possible race condition
        // when the post-edit redirect happens if the pendingUpdates queue is
        // too large to finish in time (T259564)
        $this->watchlistManager->setWatch( $watch, $user, $title, $watchlistExpiry );
 
        $this->watchedItemStore->maybeEnqueueWatchlistExpiryJob();
    }
 
    private function mergeChangesIntoContent( Content $editContent ) {
        // 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.
        $baseRevRecord = $this->getExpectedParentRevision();
        $baseContent = $baseRevRecord ?
            $baseRevRecord->getContent( SlotRecord::MAIN ) :
            null;
 
        if ( $baseContent === null ) {
            return false;
        } elseif ( $baseRevRecord->isCurrent() ) {
            // Impossible to have a conflict when the user just edited the latest revision. This can
            // happen e.g. when $wgDiff3 is badly configured.
            return [ $editContent, $baseRevRecord->getId() ];
        }
 
        // The current state, we want to merge updates into it
        $currentRevisionRecord = $this->revisionStore->getRevisionByTitle(
            $this->mTitle,
            0,
            IDBAccessObject::READ_LATEST
        );
        $currentContent = $currentRevisionRecord
            ? $currentRevisionRecord->getContent( SlotRecord::MAIN )
            : null;
 
        if ( $currentContent === null ) {
            return false;
        }
 
        $mergedContent = $this->contentHandlerFactory
            ->getContentHandler( $baseContent->getModel() )
            ->merge3( $baseContent, $editContent, $currentContent );
 
        if ( $mergedContent ) {
            // Also need to update parentRevId to what we just merged.
            return [ $mergedContent, $currentRevisionRecord->getId() ];
        }
 
        return false;
    }
 
    public function getExpectedParentRevision() {
        if ( $this->mExpectedParentRevision === false ) {
            $revRecord = null;
            if ( $this->editRevId ) {
                $revRecord = $this->revisionStore->getRevisionById(
                    $this->editRevId,
                    IDBAccessObject::READ_LATEST
                );
            } elseif ( $this->edittime ) {
                $revRecord = $this->revisionStore->getRevisionByTimestamp(
                    $this->getTitle(),
                    $this->edittime,
                    IDBAccessObject::READ_LATEST
                );
            }
            $this->mExpectedParentRevision = $revRecord;
        }
        return $this->mExpectedParentRevision;
    }
 
    public function setHeaders() {
        $out = $this->context->getOutput();
 
        $out->addModules( 'mediawiki.action.edit' );
        $out->addModuleStyles( [
            'mediawiki.action.edit.styles',
            'mediawiki.codex.messagebox.styles',
            'mediawiki.editfont.styles',
            'mediawiki.interface.helpers.styles',
        ] );
 
        $user = $this->context->getUser();
 
        if ( $this->userOptionsLookup->getOption( $user, 'uselivepreview' ) ) {
            $out->addModules( 'mediawiki.action.edit.preview' );
        }
 
        if ( $this->userOptionsLookup->getOption( $user, 'useeditwarning' ) ) {
            $out->addModules( 'mediawiki.action.edit.editWarning' );
        }
 
        if ( $this->context->getConfig()->get( MainConfigNames::EnableEditRecovery )
            && $this->userOptionsLookup->getOption( $user, 'editrecovery' )
        ) {
            $wasPosted = $this->getContext()->getRequest()->getMethod() === 'POST';
            $out->addJsConfigVars( 'wgEditRecoveryWasPosted', $wasPosted );
            $out->addModules( 'mediawiki.editRecovery.edit' );
        }
 
        # 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.
        #       Escape ::getPrefixedText() so that we have HTML in all cases,
        #       and pass as a "raw" parameter to ::setPageTitleMsg().
        $displayTitle = $this->mParserOutput ? $this->mParserOutput->getDisplayTitle() : false;
        if ( $displayTitle === false ) {
            $displayTitle = htmlspecialchars(
                $contextTitle->getPrefixedText(), ENT_QUOTES, 'UTF-8', false
            );
        } else {
            $out->setDisplayTitle( $displayTitle );
        }
 
        // Enclose the title with an element. This is used on live preview to update the
        // preview of the display title.
        $displayTitle = Html::rawElement( 'span', [ 'id' => 'firstHeadingTitle' ], $displayTitle );
 
        $out->setPageTitleMsg( $this->context->msg( $msg )->rawParams( $displayTitle ) );
 
        $config = $this->context->getConfig();
 
        # Transmit the name of the message to JavaScript. This was added for live preview.
        # Live preview doesn't use this anymore. The variable is still transmitted because
        # Edit Recovery and user scripts use it.
        $out->addJsConfigVars( [
            'wgEditMessage' => $msg,
        ] );
 
        // Add whether to use 'save' or 'publish' messages to JavaScript for post-edit, other
        // editors, etc.
        $out->addJsConfigVars(
            'wgEditSubmitButtonLabelPublish',
            $config->get( MainConfigNames::EditSubmitButtonLabelPublish )
        );
    }
 
    private function showIntro(): void {
        $services = MediaWikiServices::getInstance();
 
        // Hardcoded list of notices that are suppressable for historical reasons.
        // This feature was originally added for LiquidThreads, to avoid showing non-essential messages
        // when commenting in a thread, but some messages were included (or excluded) by mistake before
        // its implementation was moved to one place, and this list doesn't make a lot of sense.
        // TODO: Remove the suppressIntro feature from EditPage, and invent a better way for extensions
        // to skip individual intro messages.
        $skip = $this->suppressIntro ? [
            'editintro',
            'code-editing-intro',
            'sharedupload-desc-create',
            'sharedupload-desc-edit',
            'userpage-userdoesnotexist',
            'blocked-notice-logextract',
            'newarticletext',
            'newarticletextanon',
            'recreate-moveddeleted-warn',
        ] : [];
 
        $messages = $services->getIntroMessageBuilder()->getIntroMessages(
            IntroMessageBuilder::MORE_FRAMES,
            $skip,
            $this->context,
            $this->mTitle->toPageIdentity(),
            $this->mArticle->fetchRevisionRecord(),
            $this->context->getUser(),
            $this->context->getRequest()->getVal( 'editintro' ),
            wfArrayToCgi(
                array_diff_key(
                    $this->context->getRequest()->getQueryValues(),
                    [ 'title' => true, 'returnto' => true, 'returntoquery' => true ]
                )
            ),
            !$this->firsttime,
            $this->section !== '' ? $this->section : null
        );
 
        foreach ( $messages as $message ) {
            $this->context->getOutput()->addHTML( $message );
        }
    }
 
    private function toEditText( $content ) {
        if ( $content === null || $content === false ) {
            return '';
        }
        if ( 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() {
        # 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();
 
        // FlaggedRevs depends on running this hook before adding edit notices in showIntro() (T337637)
        $this->getHookRunner()->onEditPage__showEditForm_initial( $this, $out );
 
        $this->setHeaders();
 
        // Show applicable editing introductions
        $this->showIntro();
 
        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 ( $this->userOptionsLookup->getOption( $user, 'previewontop' ) ) {
            $this->displayPreviewArea( $previewOutput, true );
        }
 
        $out->addHTML( $this->editFormTextTop );
 
        if ( $this->formtype !== 'save' && $this->wasDeletedSinceLastEdit() ) {
            $out->addHTML( Html::errorBox(
                $out->msg( 'deletedwhileediting' )->parse(),
                '',
                'mw-deleted-while-editing'
            ) );
        }
 
        // @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',
                'data-mw-editform-type' => $this->formtype
            ]
        ) );
 
        // Add a check for Unicode support
        $out->addHTML( Html::hidden( 'wpUnicodeCheck', self::UNICODE_CHECK ) );
 
        // Add an empty field to trip up spambots
        $out->addHTML(
            Html::openElement( 'div', [ 'id' => 'antispam-container', 'style' => 'display: none;' ] )
            . Html::rawElement(
                'label',
                [ 'for' => 'wpAntispam' ],
                $this->context->msg( 'simpleantispam-label' )->parse()
            )
            . Html::element(
                'input',
                [
                    'type' => 'text',
                    'name' => 'wpAntispam',
                    'id' => 'wpAntispam',
                    'value' => ''
                ]
            )
            . Html::closeElement( 'div' )
        );
 
        $this->getHookRunner()->onEditPage__showEditForm_fields( $this, $out );
 
        // Put these up at the top to ensure they aren't lost on early form submission
        $this->showFormBeforeText();
 
        if ( $this->formtype === 'save' && $this->wasDeletedSinceLastEdit() ) {
            $username = $this->lastDelete->actor_name;
            $comment = $this->commentStore->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 label be moved outside of the div so that wrapWikiMsg could be used?
            $key = $comment === ''
                ? 'confirmrecreate-noreason'
                : 'confirmrecreate';
            $out->addHTML( Html::rawElement(
                'div',
                [ 'class' => 'mw-confirm-recreate' ],
                $this->context->msg( $key )
                    ->params( $username )
                    ->plaintextParams( $comment )
                    ->parse() .
                    Html::rawElement(
                        'div',
                        [],
                        Html::check(
                            'wpRecreate',
                            false,
                            [ 'title' => Linker::titleAttrib( 'recreate' ), 'tabindex' => 1, 'id' => 'wpRecreate' ]
                        )
                        . "\u{00A0}" .
                        Html::label(
                            $this->context->msg( 'recreate' )->text(),
                            'wpRecreate',
                            [ 'title' => Linker::titleAttrib( 'recreate' ) ]
                        )
                    )
            ) );
        }
 
        # 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 ||
            // @phan-suppress-next-line PhanSuspiciousValueComparison
            ( $this->section === 'new' && $this->nosummary ) ||
            $this->allowBlankSummary
        ) {
            $out->addHTML( Html::hidden( 'wpIgnoreBlankSummary', true ) );
        }
 
        if ( $this->undidRev ) {
            $out->addHTML( Html::hidden( 'wpUndidRevision', $this->undidRev ) );
        }
        if ( $this->undoAfter ) {
            $out->addHTML( Html::hidden( 'wpUndoAfter', $this->undoAfter ) );
        }
 
        if ( $this->problematicRedirectTarget !== null ) {
            // T395767, T395768: Save the target to a variable so the constraint can fail again if the redirect is
            // still problematic but has changed between two save attempts
            $out->addHTML( Html::hidden(
                'wpAllowedProblematicRedirectTarget',
                $this->problematicRedirectTarget->getFullText()
            ) );
        }
 
        $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 ) );
        if ( $this->changeTags ) {
            $out->addHTML( Html::hidden( 'wpChangeTagsAfterPreview', implode( ',', $this->changeTags ) ) );
        }
 
        $out->enableOOUI();
 
        if ( $this->section === 'new' ) {
            $this->showSummaryInput( true );
            $out->addHTML( $this->getSummaryPreview( true ) );
        }
 
        $out->addHTML( $this->editFormTextBeforeContent );
        if ( $this->isConflict ) {
            $currentText = $this->toEditText( $this->getCurrentContent() );
 
            $editConflictHelper = $this->getEditConflictHelper();
            $editConflictHelper->setTextboxes( $this->textbox1, $currentText );
            $editConflictHelper->setContentModel( $this->contentModel );
            $editConflictHelper->setContentFormat( $this->contentFormat );
            $out->addHTML( $editConflictHelper->getEditFormHtmlBeforeContent() );
 
            $this->textbox2 = $this->textbox1;
            $this->textbox1 = $currentText;
        }
 
        if ( !$this->mTitle->isUserConfigPage() ) {
            $out->addHTML( self::getEditToolbar() );
        }
 
        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';
            }
 
            // @phan-suppress-next-next-line PhanPossiblyUndeclaredVariable
            // $editConflictHelper is declard, when isConflict is true
            $out->addHTML( $editConflictHelper->getEditConflictMainTextBox( $conflictTextBoxAttribs ) );
            // @phan-suppress-next-next-line PhanPossiblyUndeclaredVariable
            // $editConflictHelper is declard, when isConflict is true
            $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.
                $out->addHTML( Html::errorBox(
                    $this->context->msg(
                        'content-failed-to-parse',
                        $this->contentModel,
                        $this->contentFormat,
                        $ex->getMessage()
                    )->parse()
                ) );
            }
        }
 
        // 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 ( !$this->userOptionsLookup->getOption( $user, 'previewontop' ) ) {
            $this->displayPreviewArea( $previewOutput, false );
        }
    }
 
    public function makeTemplatesOnThisPageList( array $templates ) {
        $templateListFormatter = new TemplatesOnThisPageFormatter(
            $this->context,
            $this->linkRenderer,
            $this->linkBatchFactory,
            $this->restrictionStore
        );
 
        // 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 )
        );
    }
 
    private static function extractSectionTitle( $text ) {
        if ( preg_match( "/^(=+)(.+)\\1\\s*(\n|$)/i", $text, $matches ) ) {
            return MediaWikiServices::getInstance()->getParser()
                ->stripSectionName( trim( $matches[2] ) );
        } else {
            return false;
        }
    }
 
    private function showHeader(): void {
        $out = $this->context->getOutput();
        $user = $this->context->getUser();
        if ( $this->isConflict ) {
            $this->addExplainConflictHeader();
            $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->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->hookError !== '' ) {
                $out->addWikiTextAsInterface( $this->hookError );
            }
 
            if ( $this->section != 'new' ) {
                $revRecord = $this->mArticle->fetchRevisionRecord();
                if ( $revRecord && $revRecord instanceof RevisionStoreRecord ) {
                    // Let sysop know that this will make private content public if saved
 
                    if ( !$revRecord->userCan( RevisionRecord::DELETED_TEXT, $user ) ) {
                        $out->addHTML(
                            Html::warningBox(
                                $out->msg( 'rev-deleted-text-permission', $this->mTitle->getPrefixedURL() )->parse(),
                                'plainlinks'
                            )
                        );
                    } elseif ( $revRecord->isDeleted( RevisionRecord::DELETED_TEXT ) ) {
                        $out->addHTML(
                            Html::warningBox(
                                // title used in wikilinks, should not contain whitespaces
                                $out->msg( 'rev-deleted-text-view', $this->mTitle->getPrefixedURL() )->parse(),
                                'plainlinks'
                            )
                        );
                    }
 
                    if ( !$revRecord->isCurrent() ) {
                        $this->mArticle->setOldSubtitle( $revRecord->getId() );
                        $this->isOldRev = true;
                    }
                } elseif ( $this->mTitle->exists() ) {
                    // Something went wrong
 
                    $out->addHTML(
                        Html::errorBox(
                            $out->msg( 'missing-revision', $this->oldid )->parse()
                        )
                    );
                }
            }
        }
 
        $this->addLongPageWarningHeader();
    }
 
    private function getSummaryInputAttributes( array $inputAttrs ): array {
        // 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 $inputAttrs + [
            'id' => 'wpSummary',
            'name' => 'wpSummary',
            'maxlength' => CommentStore::COMMENT_CHARACTER_LIMIT,
            'tabindex' => 1,
            'size' => 60,
            'spellcheck' => 'true',
        ];
    }
 
    private function getSummaryInputWidget( $summary, string $labelText, array $inputAttrs ): FieldLayout {
        $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' ],
            ]
        );
    }
 
    private function showSummaryInput( bool $isSubjectPreview ): void {
        # 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(
                $isSubjectPreview ? $this->sectiontitle : $this->summary,
                $labelText,
                [ 'class' => $summaryClass ]
            )->toString()
        );
    }
 
    private function getSummaryPreview( bool $isSubjectPreview ): string {
        // avoid spaces in preview, gets always trimmed on save
        $summary = trim( $this->summary );
        if ( $summary === '' || ( !$this->preview && !$this->diff ) ) {
            return "";
        }
 
        $commentFormatter = MediaWikiServices::getInstance()->getCommentFormatter();
        $summary = $this->context->msg( 'summary-preview' )->parse()
            . $commentFormatter->formatBlock( $summary, $this->mTitle, $isSubjectPreview );
        return Html::rawElement( 'div', [ 'class' => 'mw-summary-preview' ], $summary );
    }
 
    private function showFormBeforeText(): void {
        $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();
    }
 
    private function showTextbox1(): void {
        if ( $this->formtype === 'save' && $this->wasDeletedSinceLastEdit() ) {
            $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 = [
                'aria-label' => $this->context->msg( 'edit-textarea-aria-label' )->text(),
                'tabindex' => 1,
                'class' => $classes,
            ];
        }
 
        $this->showTextbox(
            $this->textbox1,
            'wpTextbox1',
            $attribs
        );
    }
 
    protected function showTextbox( string $text, string $name, array $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 )
        );
    }
 
    private function displayPreviewArea( string $previewOutput, bool $isOnTop ): void {
        $attribs = [ 'id' => 'wikiPreview' ];
        if ( $isOnTop ) {
            $attribs['class'] = 'ontop';
        }
        if ( $this->formtype !== 'preview' ) {
            $attribs['style'] = 'display: none;';
        }
 
        $out = $this->context->getOutput();
        $out->addHTML( Html::openElement( 'div', $attribs ) );
 
        if ( $this->formtype === 'preview' ) {
            $this->showPreview( $previewOutput );
        }
 
        $out->addHTML( '</div>' );
 
        if ( $this->formtype === 'diff' ) {
            try {
                $this->showDiff();
            } catch ( MWContentSerializationException $ex ) {
                $out->addHTML( Html::errorBox(
                    $this->context->msg(
                        'content-failed-to-parse',
                        $this->contentModel,
                        $this->contentFormat,
                        $ex->getMessage()
                    )->parse()
                ) );
            }
        }
    }
 
    private function showPreview( string $text ): void {
        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();
        $this->getHookRunner()->onOutputPageBeforeHTML( $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->sectiontitle, $this->editRevId
            );
        } else {
            $newContent = $this->page->replaceSectionContent(
                $this->section, $textboxContent, $this->sectiontitle, $this->edittime
            );
        }
 
        if ( $newContent ) {
            $this->getHookRunner()->onEditPageGetDiffContent( $this, $newContent );
 
            $user = $this->getUserForPreview();
            $parserOptions = ParserOptions::newFromUserAndLang( $user,
                MediaWikiServices::getInstance()->getContentLanguage() );
            $services = MediaWikiServices::getInstance();
            $contentTransformer = $services->getContentTransformer();
            $newContent = $contentTransformer->preSaveTransform( $newContent, $this->mTitle, $user, $parserOptions );
        }
 
        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( Html::rawElement( 'div', [ 'id' => 'wikiDiff' ], $difftext ) );
    }
 
    private function showTosSummary(): void {
        $msgKey = 'editpage-tos-summary';
        $this->getHookRunner()->onEditPageTosSummary( $this->mTitle, $msgKey );
        $msg = $this->context->msg( $msgKey );
        if ( !$msg->isDisabled() ) {
            $this->context->getOutput()->addHTML( Html::rawElement(
                'div',
                [ 'class' => 'mw-tos-summary' ],
                $msg->parseAsBlock()
            ) );
        }
    }
 
    private function showEditTools(): void {
        $this->context->getOutput()->addHTML( Html::rawElement(
            'div',
            [ 'class' => 'mw-editTools' ],
            $this->context->msg( 'edittools' )->inContentLanguage()->parse()
        ) );
    }
 
    public static function getCopyrightWarning( PageReference $page, string $format, MessageLocalizer $localizer ) {
        $services = MediaWikiServices::getInstance();
        $rightsText = $services->getMainConfig()->get( MainConfigNames::RightsText );
        if ( $rightsText ) {
            $copywarnMsg = [ 'copyrightwarning',
                '[[' . $localizer->msg( 'copyrightpage' )->inContentLanguage()->text() . ']]',
                $rightsText ];
        } else {
            $copywarnMsg = [ 'copyrightwarning2',
                '[[' . $localizer->msg( 'copyrightpage' )->inContentLanguage()->text() . ']]' ];
        }
        // Allow for site and per-namespace customization of contribution/copyright notice.
        $title = Title::newFromPageReference( $page );
        ( new HookRunner( $services->getHookContainer() ) )->onEditPageCopyrightWarning( $title, $copywarnMsg );
        if ( !$copywarnMsg ) {
            return '';
        }
 
        $msg = $localizer->msg( ...$copywarnMsg )->page( $page );
        return Html::rawElement( 'div', [ 'id' => 'editpage-copywarn' ], $msg->$format() );
    }
 
    public static function getPreviewLimitReport( ?ParserOutput $output = null ) {
        if ( !$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' );
 
        $hookRunner = new HookRunner( MediaWikiServices::getInstance()->getHookContainer() );
        foreach ( $output->getLimitReportData() as $key => $value ) {
            if ( in_array( $key, [
                'cachereport-origin',
                'cachereport-timestamp',
                'cachereport-ttl',
                'cachereport-transientcontent',
                'limitreport-timingprofile',
            ] ) ) {
                // These entries have non-numeric parameters, and can't be displayed by this code.
                // They are used by the plaintext limit report (see RenderDebugInfo::debugInfo()).
                // TODO: Display this information in the table somehow.
                continue;
            }
 
            if ( $hookRunner->onParserLimitReportFormat( $key, $value, $limitReport, true, true ) ) {
                $keyMsg = wfMessage( $key );
                $valueMsg = wfMessage( "$key-value" );
                if ( !$valueMsg->exists() ) {
                    // This is formatted raw, not as localized number.
                    // If you want the parameter formatted as a number,
                    // define the `$key-value` message.
                    $valueMsg = ( new RawMessage( '$1' ) )->params( $value );
                } else {
                    // If you define the `$key-value` or `$key-value-html`
                    // message then the argument *must* be numeric.
                    $valueMsg = $valueMsg->numParams( $value );
                }
                if ( !$keyMsg->isDisabled() && !$valueMsg->isDisabled() ) {
                    $limitReport .= Html::openElement( 'tr' ) .
                        Html::rawElement( 'th', [], $keyMsg->parse() ) .
                        Html::rawElement( 'td', [], $valueMsg->parse() ) .
                        Html::closeElement( 'tr' );
                }
            }
        }
 
        $limitReport .= Html::closeElement( 'tbody' ) .
            Html::closeElement( 'table' ) .
            Html::closeElement( 'div' );
 
        return $limitReport;
    }
 
    protected function showStandardInputs( int &$tabindex = 2 ) {
        $out = $this->context->getOutput();
        $out->addHTML( "<div class='editOptions'>\n" );
 
        if ( $this->section !== 'new' ) {
            $this->showSummaryInput( false );
            $out->addHTML( $this->getSummaryPreview( false ) );
        }
 
        // When previewing, override the selected dropdown option to select whatever was posted
        // (if it's a valid option) rather than the current value for watchlistExpiry.
        // See also above in $this->importFormDataPosted().
        $expiryFromRequest = null;
        if ( $this->preview || $this->diff || $this->isConflict ) {
            $expiryFromRequest = $this->getContext()->getRequest()->getText( 'wpWatchlistExpiry' );
        }
 
        $checkboxes = $this->getCheckboxesWidget(
            $tabindex,
            [ 'minor' => $this->minoredit, 'watch' => $this->watchthis, 'wpWatchlistExpiry' => $expiryFromRequest ]
        );
        $checkboxesHTML = new OOUI\HorizontalLayout( [ 'items' => array_values( $checkboxes ) ] );
 
        $out->addHTML( "<div class='editCheckboxes'>" . $checkboxesHTML . "</div>\n" );
 
        // Show copyright warning.
        $out->addHTML( self::getCopyrightWarning( $this->mTitle, 'parse', $this->context ) );
        $out->addHTML( $this->editFormTextAfterWarn );
 
        $out->addHTML( "<div class='editButtons'>\n" );
        $out->addHTML( implode( "\n", $this->getEditButtons( $tabindex ) ) . "\n" );
 
        $cancel = $this->getCancelLink( $tabindex++ );
 
        $edithelp = $this->getHelpLink() .
            $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" );
 
        $this->getHookRunner()->onEditPage__showStandardInputs_options( $this, $out, $tabindex );
 
        $out->addHTML( "</div><!-- editOptions -->\n" );
    }
 
    private function showConflict(): void {
        $out = $this->context->getOutput();
        if ( $this->getHookRunner()->onEditPageBeforeConflictDiff( $this, $out ) ) {
            $this->incrementConflictStats();
 
            $this->getEditConflictHelper()->showEditFormTextAfterFooters();
        }
    }
 
    private function incrementConflictStats(): void {
        $this->getEditConflictHelper()->incrementConflictStats( $this->context->getUser() );
    }
 
    private function getHelpLink(): string {
        $message = $this->context->msg( 'edithelppage' )->inContentLanguage()->text();
        $editHelpUrl = Skin::makeInternalOrExternalUrl( $message );
        return Html::element( 'a', [
            'href' => $editHelpUrl,
            'target' => 'helpwindow'
        ], $this->context->msg( 'edithelp' )->text() );
    }
 
    private function getCancelLink( int $tabindex ): ButtonWidget {
        $cancelParams = [];
        if ( !$this->isConflict && $this->oldid > 0 ) {
            $cancelParams['oldid'] = $this->oldid;
        } elseif ( $this->getContextTitle()->isRedirect() ) {
            $cancelParams['redirect'] = 'no';
        }
 
        return new OOUI\ButtonWidget( [
            'id' => 'mw-editform-cancel',
            'tabIndex' => $tabindex,
            '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 ) {
        $request = $this->context->getRequest();
        $params = $request->getQueryValuesOnly();
 
        $allowedFormParams = [
            'section', 'oldid', 'preloadtitle', 'undo', 'undoafter',
            // Considered safe in all contexts
            'uselang', 'useskin', 'useformat', 'variant', 'debug', 'safemode'
        ];
        $formParams = [ 'action' => $this->action ];
        foreach ( $params as $arg => $val ) {
            if ( in_array( $arg, $allowedFormParams, true ) ) {
                $formParams[$arg] = $val;
            }
        }
 
        return $title->getLocalURL( $formParams );
    }
 
    private function wasDeletedSinceLastEdit(): bool {
        if ( $this->deletedSinceEdit !== null ) {
            return $this->deletedSinceEdit;
        }
 
        $this->deletedSinceEdit = false;
 
        if ( !$this->mTitle->exists() && $this->mTitle->hasDeletedEdits() ) {
            $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;
    }
 
    private function getLastDelete(): ?stdClass {
        $dbr = $this->dbProvider->getReplicaDatabase();
        $commentQuery = $this->commentStore->getJoin( 'log_comment' );
        $data = $dbr->newSelectQueryBuilder()
            ->select( [
                'log_type',
                'log_action',
                'log_timestamp',
                'log_namespace',
                'log_title',
                'log_params',
                'log_deleted',
                'actor_name'
            ] )
            ->from( 'logging' )
            ->join( 'actor', null, 'actor_id=log_actor' )
            ->where( [
                'log_namespace' => $this->mTitle->getNamespace(),
                'log_title' => $this->mTitle->getDBkey(),
                'log_type' => 'delete',
                'log_action' => 'delete',
            ] )
            ->orderBy( [ 'log_timestamp', 'log_id' ], SelectQueryBuilder::SORT_DESC )
            ->queryInfo( $commentQuery )
            ->caller( __METHOD__ )
            ->fetchRow();
        // Quick paranoid permission checks...
        if ( $data !== false ) {
            if ( $data->log_deleted & LogPage::DELETED_USER ) {
                $data->actor_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 ?: null;
    }
 
    public function getPreviewText() {
        $out = $this->context->getOutput();
        $config = $this->context->getConfig();
 
        if ( $config->get( MainConfigNames::RawHtml ) && !$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 );
 
            $previewHTML = '';
            if ( !$this->getHookRunner()->onAlternateEditPreview(
                $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 ) {
                $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( MainConfigNames::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( MainConfigNames::AllowUserJs ) ) {
                        $format = false;
                    }
                } elseif ( $content->getModel() === CONTENT_MODEL_VUE ) {
                    $format = 'vue';
                    if ( $level === 'user' && !$config->get( MainConfigNames::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 ( $this->section === "new" ) {
                $content = $content->addSectionHeader( $this->sectiontitle );
            }
 
            // @phan-suppress-next-line PhanTypeMismatchArgument Type mismatch on pass-by-ref args
            $this->getHookRunner()->onEditPageGetPreviewContent( $this, $content );
 
            $parserResult = $this->doPreviewParse( $content );
            $parserOutput = $parserResult['parserOutput'];
            $previewHTML = $parserResult['html'];
            $this->mParserOutput = $parserOutput;
            $out->addParserOutputMetadata( $parserOutput );
            if ( $out->userCanPreview() ) {
                $out->addContentOverride( $this->getTitle(), $content );
            }
 
            foreach ( $parserOutput->getWarningMsgs() as $mv ) {
                $note .= "\n\n" . $this->context->msg( $mv )->text();
            }
 
        } 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::warningBox(
                $this->context->msg( 'previewconflict' )->escaped(),
                'mw-previewconflict'
            );
        } else {
            $conflict = '';
        }
 
        $previewhead = Html::rawElement(
            'div', [ 'class' => 'previewnote' ],
            Html::rawElement(
                'h2', [ 'id' => 'mw-previewheader' ],
                $this->context->msg( 'preview' )->escaped()
            ) .
            Html::warningBox(
                $out->parseAsInterface( $note )
            ) . $conflict
        );
 
        return $previewhead . $previewHTML . $this->previewTextAfterContent;
    }
 
    private function incrementEditFailureStats( string $failureType ): void {
        MediaWikiServices::getInstance()->getStatsFactory()
            ->getCounter( 'edit_failure_total' )
            ->setLabel( 'cause', $failureType )
            ->setLabel( 'namespace', 'n/a' )
            ->setLabel( 'user_bucket', 'n/a' )
            ->increment();
    }
 
    protected function getPreviewParserOptions() {
        $parserOptions = $this->page->makeParserOptions( $this->context );
        $parserOptions->setRenderReason( 'page-preview' );
        $parserOptions->setIsPreview( true );
        $parserOptions->setIsSectionPreview( $this->section !== null && $this->section !== '' );
 
        // XXX: we could call $parserOptions->setCurrentRevisionRecordCallback here to force the
        // current revision to be null during PST, until setupFakeRevision is called on
        // the ParserOptions. Currently, we rely on Parser::getRevisionRecordObject() to ignore
        // existing revisions in preview mode.
 
        return $parserOptions;
    }
 
    protected function doPreviewParse( Content $content ) {
        $user = $this->getUserForPreview();
        $parserOptions = $this->getPreviewParserOptions();
 
        // NOTE: preSaveTransform doesn't have a fake revision to operate on.
        // Parser::getRevisionRecordObject() will return null in preview mode,
        // causing the context user to be used for {{subst:REVISIONUSER}}.
        // XXX: Alternatively, we could also call setupFakeRevision()
        // before PST with $content.
        $services = MediaWikiServices::getInstance();
        $contentTransformer = $services->getContentTransformer();
        $contentRenderer = $services->getContentRenderer();
        $pstContent = $contentTransformer->preSaveTransform( $content, $this->mTitle, $user, $parserOptions );
        $parserOutput = $contentRenderer->getParserOutput( $pstContent, $this->mTitle, null, $parserOptions );
        $out = $this->context->getOutput();
        $skin = $out->getSkin();
        $skinOptions = $skin->getOptions();
        // TODO T371004 move runOutputPipeline out of $parserOutput
        // TODO T371022 ideally we clone here, but for now let's reproduce getText behaviour
        $oldHtml = $parserOutput->getRawText();
        $html = $parserOutput->runOutputPipeline( $parserOptions, [
            'allowClone' => 'false',
            'userLang' => $skin->getLanguage(),
            'injectTOC' => $skinOptions['toc'],
            'enableSectionEditLinks' => false,
            'includeDebugInfo' => true,
        ] )->getContentHolderText();
        $parserOutput->setRawText( $oldHtml );
        return [
            'parserOutput' => $parserOutput,
            'html' => $html
        ];
    }
 
    public function getTemplates() {
        if ( $this->preview || $this->section !== '' ) {
            $templates = [];
            if ( !$this->mParserOutput ) {
                return $templates;
            }
            foreach (
                $this->mParserOutput->getLinkList( ParserOutputLinkTypes::TEMPLATE )
                as [ 'link' => $link ]
            ) {
                $templates[] = Title::newFromLinkTarget( $link );
            }
            return $templates;
        } else {
            return $this->mTitle->getTemplateLinksFrom();
        }
    }
 
    public static function getEditToolbar() {
        $startingToolbar = '<div id="toolbar"></div>';
        $toolbar = $startingToolbar;
 
        $hookRunner = new HookRunner( MediaWikiServices::getInstance()->getHookContainer() );
        if ( !$hookRunner->onEditPageBeforeEditToolbar( $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( $values ) {
        $checkboxes = [];
 
        $user = $this->context->getUser();
        // don't show the minor edit checkbox if it's a new page or section
        if ( !$this->isNew && $this->permManager->userHasRight( $user, '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' => $values['minor'],
            ];
        }
 
        if ( $user->isNamed() ) {
            $checkboxes = array_merge(
                $checkboxes,
                $this->getCheckboxesDefinitionForWatchlist( $values['watch'], $values['wpWatchlistExpiry'] ?? null )
            );
        }
 
        $this->getHookRunner()->onEditPageGetCheckboxesDefinition( $this, $checkboxes );
 
        return $checkboxes;
    }
 
    private function getCheckboxesDefinitionForWatchlist( $watch, $watchexpiry ): array {
        $fieldDefs = [
            'wpWatchthis' => [
                'id' => 'wpWatchthis',
                'label-message' => 'watchthis',
                // Uses messages: tooltip-watch, accesskey-watch
                'tooltip' => 'watch',
                'label-id' => 'mw-editpage-watch',
                'legacy-name' => 'watch',
                'default' => $watch,
            ]
        ];
        if ( $this->watchlistExpiryEnabled ) {
            $watchedItem = $this->watchedItemStore->getWatchedItem( $this->getContext()->getUser(), $this->getTitle() );
            if ( $watchedItem instanceof WatchedItem && $watchedItem->getExpiry() === null ) {
                // Not temporarily watched, so we always default to infinite.
                $userPreferredExpiry = 'infinite';
            } else {
                $userPreferredExpiryOption = !$this->getTitle()->exists()
                    ? 'watchcreations-expiry'
                    : 'watchdefault-expiry';
                $userPreferredExpiry = $this->userOptionsLookup->getOption(
                    $this->getContext()->getUser(),
                    $userPreferredExpiryOption,
                    'infinite'
                );
            }
 
            $expiryOptions = WatchAction::getExpiryOptions(
                $this->getContext(),
                $watchedItem,
                $userPreferredExpiry
            );
 
            if ( $watchexpiry && in_array( $watchexpiry, $expiryOptions['options'] ) ) {
                $expiryOptions['default'] = $watchexpiry;
            }
            // When previewing, override the selected dropdown option to select whatever was posted
            // (if it's a valid option) rather than the current value for watchlistExpiry.
            // See also above in $this->importFormDataPosted().
            $expiryFromRequest = $this->getContext()->getRequest()->getText( 'wpWatchlistExpiry' );
            if ( ( $this->preview || $this->diff ) && in_array( $expiryFromRequest, $expiryOptions['options'] ) ) {
                $expiryOptions['default'] = $expiryFromRequest;
            }
 
            // Reformat the options to match what DropdownInputWidget wants.
            $options = [];
            foreach ( $expiryOptions['options'] as $label => $value ) {
                $options[] = [ 'data' => $value, 'label' => $label ];
            }
 
            $fieldDefs['wpWatchlistExpiry'] = [
                'id' => 'wpWatchlistExpiry',
                'label-message' => 'confirm-watch-label',
                // Uses messages: tooltip-watchlist-expiry, accesskey-watchlist-expiry
                'tooltip' => 'watchlist-expiry',
                'label-id' => 'mw-editpage-watchlist-expiry',
                'default' => $expiryOptions['default'],
                'value-attr' => 'value',
                'class' => DropdownInputWidget::class,
                'options' => $options,
                'invisibleLabel' => true,
            ];
        }
        return $fieldDefs;
    }
 
    public function getCheckboxesWidget( &$tabindex, $values ) {
        $checkboxes = [];
        $checkboxesDef = $this->getCheckboxesDefinition( $values );
 
        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();
            }
            // Allow checkbox definitions to set their own class and value-attribute names.
            // See $this->getCheckboxesDefinition() for details.
            $className = $options['class'] ?? CheckboxInputWidget::class;
            $valueAttr = $options['value-attr'] ?? 'selected';
            $checkboxes[ $legacyName ] = new FieldLayout(
                new $className( [
                    'tabIndex' => ++$tabindex,
                    'accessKey' => $accesskey,
                    'id' => $options['id'] . 'Widget',
                    'inputId' => $options['id'],
                    'name' => $name,
                    $valueAttr => $options['default'],
                    'infusable' => true,
                    'options' => $options['options'] ?? null,
                ] ),
                [
                    'align' => 'inline',
                    'label' => new OOUI\HtmlSnippet( $this->context->msg( $options['label-message'] )->parse() ),
                    'title' => $title,
                    'id' => $options['label-id'] ?? null,
                    'invisibleLabel' => $options['invisibleLabel'] ?? null,
                ]
            );
        }
 
        return $checkboxes;
    }
 
    private function getSubmitButtonLabel(): string {
        $labelAsPublish =
            $this->context->getConfig()->get( MainConfigNames::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( MainConfigNames::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',
            // Allow previewing even when the form is in invalid state (T343585)
            'formNoValidate' => true,
            // 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',
            // Allow previewing even when the form is in invalid state (T343585)
            'formNoValidate' => true,
            // Message used: tooltip-diff
            'title' => Linker::titleAttrib( 'diff' ),
            // Message used: accesskey-diff
            'accessKey' => Linker::accesskey( 'diff' ),
        ] );
 
        $this->getHookRunner()->onEditPageBeforeEditButtons( $this, $buttons, $tabindex );
 
        return $buttons;
    }
 
    private function noSuchSectionPage(): void {
        $out = $this->context->getOutput();
        $out->prepareErrorPage();
        $out->setPageTitleMsg( $this->context->msg( 'nosuchsectiontitle' ) );
 
        $res = $this->context->msg( 'nosuchsectiontext', $this->section )->parseAsBlock();
 
        $this->getHookRunner()->onEditPageNoSuchSection( $this, $res );
        $out->addHTML( $res );
 
        $out->returnToMain( false, $this->mTitle );
    }
 
    public function spamPageWithContent( $match = false ) {
        $this->textbox2 = $this->textbox1;
 
        $out = $this->context->getOutput();
        $out->prepareErrorPage();
        $out->setPageTitleMsg( $this->context->msg( 'spamprotectiontitle' ) );
 
        $spamText = $this->context->msg( 'spamprotectiontext' )->parseAsBlock();
 
        if ( $match ) {
            if ( is_array( $match ) ) {
                // Do not use `wfEscapeWikiText( ... )` here for compatibility with PHP <8.1.4
                // https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1160800/comment/92e67687_ab221188/
                $matchText = $this->context->getLanguage()->listToText( array_map( 'wfEscapeWikiText', $match ) );
            } else {
                $matchText = wfEscapeWikiText( $match );
            }
 
            $spamText .= $this->context->msg( 'spamprotectionmatch' )
                ->params( $matchText )
                ->parseAsBlock();
        }
        $out->addHTML( Html::rawElement(
            'div',
            [ 'id' => 'spamprotected' ],
            $spamText
        ) );
 
        $out->wrapWikiMsg( '<h2>$1</h2>', "yourdiff" );
        $this->showDiff();
 
        $out->wrapWikiMsg( '<h2>$1</h2>', "yourtext" );
        $this->showTextbox( $this->textbox2, 'wpTextbox2', [ 'tabindex' => 6, 'readonly' ] );
 
        $out->addReturnTo( $this->getContextTitle(), [ 'action' => 'edit' ] );
    }
 
    private function addLongPageWarningHeader(): void {
        if ( $this->contentLength === false ) {
            $this->contentLength = strlen( $this->textbox1 );
        }
 
        $out = $this->context->getOutput();
        $longPageHint = $this->context->msg( 'longpage-hint' );
        if ( !$longPageHint->isDisabled() ) {
            $msgText = trim( $longPageHint->sizeParams( $this->contentLength )
                ->params( $this->contentLength ) // Keep this unformatted for math inside message
                ->parse() );
            if ( $msgText !== '' && $msgText !== '-' ) {
                $out->addHTML( "<div id='mw-edit-longpage-hint'>\n$msgText\n</div>" );
            }
        }
    }
 
    private function addExplainConflictHeader(): void {
        $this->context->getOutput()->addHTML(
            $this->getEditConflictHelper()->getExplainHeader()
        );
    }
 
    private function guessSectionName( $text ): string {
        $parser = MediaWikiServices::getInstance()->getParser();
        $name = $parser->guessSectionNameFromWikiText( $text );
        // 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 $factory ) {
        Assert::precondition( !$this->editConflictHelperFactory,
            'Can only have one extension that resolves edit conflicts' );
        $this->editConflictHelperFactory = $factory;
    }
 
    private function getEditConflictHelper(): TextConflictHelper {
        if ( !$this->editConflictHelper ) {
            $label = $this->getSubmitButtonLabel();
            if ( $this->editConflictHelperFactory ) {
                $this->editConflictHelper = ( $this->editConflictHelperFactory )( $label );
            } else {
                $this->editConflictHelper = new TextConflictHelper(
                    $this->getTitle(),
                    $this->getContext()->getOutput(),
                    MediaWikiServices::getInstance()->getStatsFactory(),
                    $label,
                    MediaWikiServices::getInstance()->getContentHandlerFactory()
                );
            }
        }
        return $this->editConflictHelper;
    }
}