SpecialEditWatchlist.php

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<?php
namespace MediaWiki\Specials;
 
use DeferredUpdates;
use EditWatchlistCheckboxSeriesField;
use EditWatchlistNormalHTMLForm;
use GenderCache;
use HTMLForm;
use LogicException;
use MediaWiki\Cache\LinkBatchFactory;
use MediaWiki\Html\Html;
use MediaWiki\Linker\LinkRenderer;
use MediaWiki\Linker\LinkTarget;
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
use MediaWiki\Page\WikiPageFactory;
use MediaWiki\Parser\ParserOutputFlags;
use MediaWiki\Request\WebRequest;
use MediaWiki\SpecialPage\SpecialPage;
use MediaWiki\SpecialPage\UnlistedSpecialPage;
use MediaWiki\Status\Status;
use MediaWiki\Title\MalformedTitleException;
use MediaWiki\Title\NamespaceInfo;
use MediaWiki\Title\Title;
use MediaWiki\Title\TitleParser;
use MediaWiki\Title\TitleValue;
use MediaWiki\Watchlist\WatchlistManager;
use OOUIHTMLForm;
use Parser;
use ParserOutput;
use UserNotLoggedIn;
use WatchedItemStore;
use WatchedItemStoreInterface;
use Wikimedia\Parsoid\Core\SectionMetadata;
use Wikimedia\Parsoid\Core\TOCData;
 
class SpecialEditWatchlist extends UnlistedSpecialPage {
    public const EDIT_CLEAR = 1;
    public const EDIT_RAW = 2;
    public const EDIT_NORMAL = 3;
    public const VIEW = 4;
 
    protected $successMessage;
 
    protected $tocData;
 
    private $badItems = [];
 
    private TitleParser $titleParser;
    private WatchedItemStoreInterface $watchedItemStore;
    private GenderCache $genderCache;
    private LinkBatchFactory $linkBatchFactory;
    private NamespaceInfo $nsInfo;
    private WikiPageFactory $wikiPageFactory;
    private WatchlistManager $watchlistManager;
 
    private $currentMode;
 
    public function __construct(
        WatchedItemStoreInterface $watchedItemStore = null,
        TitleParser $titleParser = null,
        GenderCache $genderCache = null,
        LinkBatchFactory $linkBatchFactory = null,
        NamespaceInfo $nsInfo = null,
        WikiPageFactory $wikiPageFactory = null,
        WatchlistManager $watchlistManager = null
    ) {
        parent::__construct( 'EditWatchlist', 'editmywatchlist' );
        // This class is extended and therefor fallback to global state - T266065
        $services = MediaWikiServices::getInstance();
        $this->watchedItemStore = $watchedItemStore ?? $services->getWatchedItemStore();
        $this->titleParser = $titleParser ?? $services->getTitleParser();
        $this->genderCache = $genderCache ?? $services->getGenderCache();
        $this->linkBatchFactory = $linkBatchFactory ?? $services->getLinkBatchFactory();
        $this->nsInfo = $nsInfo ?? $services->getNamespaceInfo();
        $this->wikiPageFactory = $wikiPageFactory ?? $services->getWikiPageFactory();
        $this->watchlistManager = $watchlistManager ?? $services->getWatchlistManager();
    }
 
    public function doesWrites() {
        return true;
    }
 
    public function execute( $mode ) {
        $this->setHeaders();
 
        $user = $this->getUser();
        if ( !$user->isRegistered()
            || ( $user->isTemp() && !$user->isAllowed( 'editmywatchlist' ) )
        ) {
            throw new UserNotLoggedIn( 'watchlistanontext' );
        }
 
        $out = $this->getOutput();
 
        $this->checkPermissions();
        $this->checkReadOnly();
 
        $this->outputHeader();
        $out->addModuleStyles( [
            'mediawiki.interface.helpers.styles',
            'mediawiki.special'
        ] );
        $out->addModules( [ 'mediawiki.special.watchlist' ] );
 
        $mode = self::getMode( $this->getRequest(), $mode, self::EDIT_NORMAL );
        $this->currentMode = $mode;
        $this->outputSubtitle();
 
        switch ( $mode ) {
            case self::VIEW:
                $title = SpecialPage::getTitleFor( 'Watchlist' );
                $out->redirect( $title->getLocalURL() );
                break;
            case self::EDIT_RAW:
                $out->setPageTitleMsg( $this->msg( 'watchlistedit-raw-title' ) );
                $form = $this->getRawForm();
                if ( $form->show() ) {
                    $out->addHTML( $this->successMessage );
                    $out->addReturnTo( SpecialPage::getTitleFor( 'Watchlist' ) );
                }
                break;
            case self::EDIT_CLEAR:
                $out->setPageTitleMsg( $this->msg( 'watchlistedit-clear-title' ) );
                $form = $this->getClearForm();
                if ( $form->show() ) {
                    $out->addHTML( $this->successMessage );
                    $out->addReturnTo( SpecialPage::getTitleFor( 'Watchlist' ) );
                }
                break;
 
            case self::EDIT_NORMAL:
            default:
                $this->executeViewEditWatchlist();
                break;
        }
    }
 
    protected function outputSubtitle() {
        $out = $this->getOutput();
        $skin = $this->getSkin();
        // For legacy skins render the tabs in the subtitle
        $subpageSubtitle = $skin->supportsMenu( 'associated-pages' ) ? '' :
            ' ' .
                self::buildTools(
                    null,
                    $this->getLinkRenderer(),
                    $this->currentMode
                );
        $out->addSubtitle(
            Html::element(
                'span',
                [
                    'class' => 'mw-watchlist-owner'
                ],
                // Previously the watchlistfor2 message took 2 parameters.
                // It now only takes 1 so empty string is passed.
                // Empty string parameter can be removed when all messages
                // are updated to not use $2
                $this->msg( 'watchlistfor2', $this->getUser()->getName(), '' )->text()
            ) . $subpageSubtitle
        );
    }
 
    public function getAssociatedNavigationLinks() {
        return SpecialWatchlist::WATCHLIST_TAB_PATHS;
    }
 
    public function getShortDescription( string $path = '' ): string {
        return SpecialWatchlist::getShortDescriptionHelper( $this, $path );
    }
 
    protected function executeViewEditWatchlist() {
        $out = $this->getOutput();
        $out->setPageTitleMsg( $this->msg( 'watchlistedit-normal-title' ) );
 
        $form = $this->getNormalForm();
        $form->prepareForm();
 
        $result = $form->tryAuthorizedSubmit();
        if ( $result === true || ( $result instanceof Status && $result->isGood() ) ) {
            $out->addHTML( $this->successMessage );
            $out->addReturnTo( SpecialPage::getTitleFor( 'Watchlist' ) );
            return;
        }
 
        $pout = new ParserOutput;
        $pout->setTOCData( $this->tocData );
        $pout->setOutputFlag( ParserOutputFlags::SHOW_TOC );
        $pout->setText( Parser::TOC_PLACEHOLDER );
        $out->addParserOutput( $pout );
 
        $form->displayForm( $result );
    }
 
    public function getSubpagesForPrefixSearch() {
        // SpecialWatchlist uses SpecialEditWatchlist::getMode, so new types should be added
        // here and there - no 'edit' here, because that the default for this page
        return [
            'clear',
            'raw',
        ];
    }
 
    private function extractTitles( $list ) {
        $list = explode( "\n", trim( $list ) );
 
        $titles = [];
 
        foreach ( $list as $text ) {
            $text = trim( $text );
            if ( strlen( $text ) > 0 ) {
                $title = Title::newFromText( $text );
                if ( $title instanceof Title && $this->watchlistManager->isWatchable( $title ) ) {
                    $titles[] = $title;
                }
            }
        }
 
        $this->genderCache->doTitlesArray( $titles );
 
        $list = [];
        foreach ( $titles as $title ) {
            $list[] = $title->getPrefixedText();
        }
 
        return array_unique( $list );
    }
 
    public function submitRaw( $data ) {
        $wanted = $this->extractTitles( $data['Titles'] );
        $current = $this->getWatchlist();
 
        if ( count( $wanted ) > 0 ) {
            $toWatch = array_diff( $wanted, $current );
            $toUnwatch = array_diff( $current, $wanted );
            if ( !$toWatch && !$toUnwatch ) {
                return false;
            }
 
            $this->watchTitles( $toWatch );
            $this->unwatchTitles( $toUnwatch );
            $this->getUser()->invalidateCache();
            $this->successMessage = $this->msg( 'watchlistedit-raw-done' )->parse();
 
            if ( $toWatch ) {
                $this->successMessage .= ' ' . $this->msg( 'watchlistedit-raw-added' )
                    ->numParams( count( $toWatch ) )->parse();
                $this->showTitles( $toWatch, $this->successMessage );
            }
 
            if ( $toUnwatch ) {
                $this->successMessage .= ' ' . $this->msg( 'watchlistedit-raw-removed' )
                    ->numParams( count( $toUnwatch ) )->parse();
                $this->showTitles( $toUnwatch, $this->successMessage );
            }
        } else {
            if ( !$current ) {
                return false;
            }
 
            $this->clearUserWatchedItems( 'raw' );
            $this->showTitles( $current, $this->successMessage );
        }
 
        return true;
    }
 
    public function submitClear( $data ): bool {
        $this->clearUserWatchedItems( 'clear' );
        return true;
    }
 
    private function clearUserWatchedItems( string $messageFor ): void {
        if ( $this->watchedItemStore->mustClearWatchedItemsUsingJobQueue( $this->getUser() ) ) {
            $this->clearUserWatchedItemsUsingJobQueue();
        } else {
            $this->clearUserWatchedItemsNow( $messageFor );
        }
    }
 
    private function clearUserWatchedItemsNow( string $messageFor ): void {
        $current = $this->getWatchlist();
        if ( !$this->watchedItemStore->clearUserWatchedItems( $this->getUser() ) ) {
            throw new LogicException(
                __METHOD__ . ' should only be called when able to clear synchronously'
            );
        }
        // Messages used: watchlistedit-clear-done, watchlistedit-raw-done
        $this->successMessage = $this->msg( 'watchlistedit-' . $messageFor . '-done' )->parse();
        // Messages used: watchlistedit-clear-removed, watchlistedit-raw-removed
        $this->successMessage .= ' ' . $this->msg( 'watchlistedit-' . $messageFor . '-removed' )
                ->numParams( count( $current ) )->parse();
        $this->getUser()->invalidateCache();
        $this->showTitles( $current, $this->successMessage );
    }
 
    private function clearUserWatchedItemsUsingJobQueue(): void {
        $this->watchedItemStore->clearUserWatchedItemsUsingJobQueue( $this->getUser() );
        $this->successMessage = $this->msg( 'watchlistedit-clear-jobqueue' )->parse();
    }
 
    private function showTitles( $titles, &$output ) {
        $talk = $this->msg( 'talkpagelinktext' )->text();
        // Do a batch existence check
        $batch = $this->linkBatchFactory->newLinkBatch();
        if ( count( $titles ) >= 100 ) {
            $output = $this->msg( 'watchlistedit-too-many' )->parse();
            return;
        }
        foreach ( $titles as $title ) {
            if ( !$title instanceof Title ) {
                $title = Title::newFromText( $title );
            }
 
            if ( $title instanceof Title ) {
                $batch->addObj( $title );
                $batch->addObj( $title->getTalkPage() );
            }
        }
 
        $batch->execute();
 
        // Print out the list
        $output .= "<ul>\n";
 
        $linkRenderer = $this->getLinkRenderer();
        foreach ( $titles as $title ) {
            if ( !$title instanceof Title ) {
                $title = Title::newFromText( $title );
            }
 
            if ( $title instanceof Title ) {
                $output .= '<li>' .
                    $linkRenderer->makeLink( $title ) . ' ' .
                    $this->msg( 'parentheses' )->rawParams(
                        $linkRenderer->makeLink( $title->getTalkPage(), $talk )
                    )->escaped() .
                    "</li>\n";
            }
        }
 
        $output .= "</ul>\n";
    }
 
    private function getWatchlist() {
        $list = [];
 
        $watchedItems = $this->watchedItemStore->getWatchedItemsForUser(
            $this->getUser(),
            [ 'forWrite' => $this->getRequest()->wasPosted() ]
        );
 
        if ( $watchedItems ) {
            $titles = [];
            foreach ( $watchedItems as $watchedItem ) {
                $namespace = $watchedItem->getTarget()->getNamespace();
                $dbKey = $watchedItem->getTarget()->getDBkey();
                $title = Title::makeTitleSafe( $namespace, $dbKey );
 
                if ( $this->checkTitle( $title, $namespace, $dbKey )
                    && !$title->isTalkPage()
                ) {
                    $titles[] = $title;
                }
            }
 
            $this->genderCache->doTitlesArray( $titles );
 
            foreach ( $titles as $title ) {
                $list[] = $title->getPrefixedText();
            }
        }
 
        $this->cleanupWatchlist();
 
        return $list;
    }
 
    protected function getWatchlistInfo() {
        $titles = [];
        $options = [ 'sort' => WatchedItemStore::SORT_ASC ];
 
        if ( $this->getConfig()->get( MainConfigNames::WatchlistExpiry ) ) {
            $options[ 'sortByExpiry'] = true;
        }
 
        $watchedItems = $this->watchedItemStore->getWatchedItemsForUser(
            $this->getUser(), $options
        );
 
        $lb = $this->linkBatchFactory->newLinkBatch();
        $context = $this->getContext();
 
        foreach ( $watchedItems as $watchedItem ) {
            $namespace = $watchedItem->getTarget()->getNamespace();
            $dbKey = $watchedItem->getTarget()->getDBkey();
            $lb->add( $namespace, $dbKey );
            if ( !$this->nsInfo->isTalk( $namespace ) ) {
                $titles[$namespace][$dbKey] = $watchedItem->getExpiryInDaysText( $context );
            }
        }
 
        $lb->execute();
 
        return $titles;
    }
 
    private function checkTitle( $title, $namespace, $dbKey ) {
        if ( $title
            && ( $title->isExternal()
                || $title->getNamespace() < 0
            )
        ) {
            $title = false; // unrecoverable
        }
 
        if ( !$title
            || $title->getNamespace() != $namespace
            || $title->getDBkey() != $dbKey
        ) {
            $this->badItems[] = [ $title, $namespace, $dbKey ];
        }
 
        return (bool)$title;
    }
 
    private function cleanupWatchlist() {
        if ( $this->badItems === [] ) {
            return; // nothing to do
        }
 
        $user = $this->getUser();
        $badItems = $this->badItems;
        DeferredUpdates::addCallableUpdate( function () use ( $user, $badItems ) {
            foreach ( $badItems as [ $title, $namespace, $dbKey ] ) {
                $action = $title ? 'cleaning up' : 'deleting';
                wfDebug( "User {$user->getName()} has broken watchlist item " .
                    "ns($namespace):$dbKey, $action." );
 
                // NOTE: We *know* that the title is invalid. TitleValue may refuse instantiation.
                // XXX: We may need an InvalidTitleValue class that allows instantiation of
                //      known bad title values.
                $this->watchedItemStore->removeWatch( $user, Title::makeTitle( (int)$namespace, $dbKey ) );
                // Can't just do an UPDATE instead of DELETE/INSERT due to unique index
                if ( $title ) {
                    $this->watchlistManager->addWatch( $user, $title );
                }
            }
        } );
    }
 
    private function watchTitles( array $targets ): void {
        if ( $targets &&
            $this->watchedItemStore->addWatchBatchForUser(
                $this->getUser(), $this->getExpandedTargets( $targets )
            )
        ) {
            $this->runWatchUnwatchCompleteHook( 'Watch', $targets );
        }
    }
 
    private function unwatchTitles( array $targets ): void {
        if ( $targets &&
            $this->watchedItemStore->removeWatchBatchForUser(
                $this->getUser(), $this->getExpandedTargets( $targets )
            )
        ) {
            $this->runWatchUnwatchCompleteHook( 'Unwatch', $targets );
        }
    }
 
    private function runWatchUnwatchCompleteHook( string $action, array $targets ): void {
        foreach ( $targets as $target ) {
            $title = $target instanceof LinkTarget ?
                Title::newFromLinkTarget( $target ) :
                Title::newFromText( $target );
            $page = $this->wikiPageFactory->newFromTitle( $title );
            $user = $this->getUser();
            if ( $action === 'Watch' ) {
                $this->getHookRunner()->onWatchArticleComplete( $user, $page );
            } else {
                $this->getHookRunner()->onUnwatchArticleComplete( $user, $page );
            }
        }
    }
 
    private function getExpandedTargets( array $targets ) {
        $expandedTargets = [];
        foreach ( $targets as $target ) {
            if ( !$target instanceof LinkTarget ) {
                try {
                    $target = $this->titleParser->parseTitle( $target, NS_MAIN );
                } catch ( MalformedTitleException $e ) {
                    continue;
                }
            }
 
            $ns = $target->getNamespace();
            $dbKey = $target->getDBkey();
            $expandedTargets[] =
                new TitleValue( $this->nsInfo->getSubject( $ns ), $dbKey );
            $expandedTargets[] =
                new TitleValue( $this->nsInfo->getTalk( $ns ), $dbKey );
        }
        return $expandedTargets;
    }
 
    public function submitNormal( $data ) {
        $removed = [];
 
        foreach ( $data as $titles ) {
            // ignore the 'check all' checkbox, which is a boolean value
            if ( is_array( $titles ) ) {
                $this->unwatchTitles( $titles );
                $removed = array_merge( $removed, $titles );
            }
        }
 
        if ( count( $removed ) > 0 ) {
            $this->successMessage = $this->msg( 'watchlistedit-normal-done'
            )->numParams( count( $removed ) )->parse();
            $this->showTitles( $removed, $this->successMessage );
 
            return true;
        } else {
            return false;
        }
    }
 
    protected function getNormalForm() {
        $fields = [];
        $count = 0;
 
        // Allow subscribers to manipulate the list of watched pages (or use it
        // to preload lots of details at once)
        $watchlistInfo = $this->getWatchlistInfo();
        $this->getHookRunner()->onWatchlistEditorBeforeFormRender( $watchlistInfo );
 
        foreach ( $watchlistInfo as $namespace => $pages ) {
            $options = [];
            foreach ( $pages as $dbkey => $expiryDaysText ) {
                $title = Title::makeTitleSafe( $namespace, $dbkey );
 
                if ( $this->checkTitle( $title, $namespace, $dbkey ) ) {
                    $text = $this->buildRemoveLine( $title, $expiryDaysText );
                    $options[$text] = $title->getPrefixedText();
                    $count++;
                }
            }
 
            // checkTitle can filter some options out, avoid empty sections
            if ( count( $options ) > 0 ) {
                // add a checkbox to select all entries in namespace
                $fields['CheckAllNs' . $namespace] = [
                    'cssclass' => 'mw-watchlistedit-checkall',
                    'type' => 'check',
                    'section' => "ns$namespace",
                    'label' => $this->msg( 'watchlistedit-normal-check-all' )->text()
                ];
 
                $fields['TitlesNs' . $namespace] = [
                    'cssclass' => 'mw-watchlistedit-check',
                    'class' => EditWatchlistCheckboxSeriesField::class,
                    'options' => $options,
                    'section' => "ns$namespace",
                ];
            }
        }
        $this->cleanupWatchlist();
 
        $this->tocData = new TOCData();
        if ( count( $fields ) > 1 && $count > 30 ) {
            $tocLength = 0;
            $contLang = $this->getContentLanguage();
            foreach ( $fields as $key => $data ) {
                // ignore the 'check all'  field
                if ( str_starts_with( $key, 'CheckAllNs' ) ) {
                    continue;
                }
                # strip out the 'ns' prefix from the section name:
                $ns = (int)substr( $data['section'], 2 );
                $nsText = ( $ns === NS_MAIN )
                    ? $this->msg( 'blanknamespace' )->text()
                    : $contLang->getFormattedNsText( $ns );
                $anchor = "editwatchlist-{$data['section']}";
                ++$tocLength;
                $this->tocData->addSection( new SectionMetadata(
                    1,
                    // This is supposed to be the heading level, e.g. 2 for a <h2> tag,
                    // but this page uses <legend> tags for the headings, so use a fake value
                    99,
                    htmlspecialchars( $nsText ),
                    $this->getLanguage()->formatNum( $tocLength ),
                    (string)$tocLength,
                    null,
                    null,
                    $anchor,
                    $anchor
                ) );
            }
        }
 
        $form = new EditWatchlistNormalHTMLForm( $fields, $this->getContext() );
        $form->setTitle( $this->getPageTitle() ); // Remove subpage
        $form->setSubmitTextMsg( 'watchlistedit-normal-submit' );
        $form->setSubmitDestructive();
        # Used message keys:
        # 'accesskey-watchlistedit-normal-submit', 'tooltip-watchlistedit-normal-submit'
        $form->setSubmitTooltip( 'watchlistedit-normal-submit' );
        $form->setWrapperLegendMsg( 'watchlistedit-normal-legend' );
        $form->addHeaderHtml( $this->msg( 'watchlistedit-normal-explain' )->parse() );
        $form->setSubmitCallback( [ $this, 'submitNormal' ] );
 
        return $form;
    }
 
    private function buildRemoveLine( $title, string $expiryDaysText = '' ): string {
        $linkRenderer = $this->getLinkRenderer();
        $link = $linkRenderer->makeLink( $title );
 
        $tools = [];
        $tools['talk'] = $linkRenderer->makeLink(
            $title->getTalkPage(),
            $this->msg( 'talkpagelinktext' )->text()
        );
 
        if ( $title->exists() ) {
            $tools['history'] = $linkRenderer->makeKnownLink(
                $title,
                $this->msg( 'history_small' )->text(),
                [],
                [ 'action' => 'history' ]
            );
        }
 
        if ( $title->getNamespace() === NS_USER && !$title->isSubpage() ) {
            $tools['contributions'] = $linkRenderer->makeKnownLink(
                SpecialPage::getTitleFor( 'Contributions', $title->getText() ),
                $this->msg( 'contribslink' )->text()
            );
        }
 
        $this->getHookRunner()->onWatchlistEditorBuildRemoveLine(
            $tools, $title, $title->isRedirect(), $this->getSkin(), $link );
 
        if ( $title->isRedirect() ) {
            // Linker already makes class mw-redirect, so this is redundant
            $link = '<span class="watchlistredir">' . $link . '</span>';
        }
 
        $watchlistExpiringMessage = '';
        if ( $this->getConfig()->get( MainConfigNames::WatchlistExpiry ) && $expiryDaysText ) {
            $watchlistExpiringMessage = Html::element(
                'span',
                [ 'class' => 'mw-watchlistexpiry-msg' ],
                $expiryDaysText
            );
        }
 
        return $link . ' ' . Html::openElement( 'span', [ 'class' => 'mw-changeslist-links' ] ) .
            implode(
                '',
                array_map( static function ( $tool ) {
                    return Html::rawElement( 'span', [], $tool );
                }, $tools )
            ) .
            Html::closeElement( 'span' ) .
            $watchlistExpiringMessage;
    }
 
    protected function getRawForm() {
        $titles = implode( "\n", $this->getWatchlist() );
        $fields = [
            'Titles' => [
                'type' => 'textarea',
                'label-message' => 'watchlistedit-raw-titles',
                'default' => $titles,
            ],
        ];
        $form = new OOUIHTMLForm( $fields, $this->getContext() );
        $form->setTitle( $this->getPageTitle( 'raw' ) ); // Reset subpage
        $form->setSubmitTextMsg( 'watchlistedit-raw-submit' );
        # Used message keys: 'accesskey-watchlistedit-raw-submit', 'tooltip-watchlistedit-raw-submit'
        $form->setSubmitTooltip( 'watchlistedit-raw-submit' );
        $form->setWrapperLegendMsg( 'watchlistedit-raw-legend' );
        $form->addHeaderHtml( $this->msg( 'watchlistedit-raw-explain' )->parse() );
        $form->setSubmitCallback( [ $this, 'submitRaw' ] );
 
        return $form;
    }
 
    protected function getClearForm() {
        $form = new OOUIHTMLForm( [], $this->getContext() );
        $form->setTitle( $this->getPageTitle( 'clear' ) ); // Reset subpage
        $form->setSubmitTextMsg( 'watchlistedit-clear-submit' );
        # Used message keys: 'accesskey-watchlistedit-clear-submit', 'tooltip-watchlistedit-clear-submit'
        $form->setSubmitTooltip( 'watchlistedit-clear-submit' );
        $form->setWrapperLegendMsg( 'watchlistedit-clear-legend' );
        $form->addHeaderHtml( $this->msg( 'watchlistedit-clear-explain' )->parse() );
        $form->setSubmitCallback( [ $this, 'submitClear' ] );
        $form->setSubmitDestructive();
 
        return $form;
    }
 
    public static function getMode( $request, $par, $defaultValue = false ) {
        $mode = strtolower( $request->getRawVal( 'action', $par ?? '' ) );
 
        switch ( $mode ) {
            case 'view':
                return self::VIEW;
            case 'clear':
            case self::EDIT_CLEAR:
                return self::EDIT_CLEAR;
            case 'raw':
            case self::EDIT_RAW:
                return self::EDIT_RAW;
            case 'edit':
            case self::EDIT_NORMAL:
                return self::EDIT_NORMAL;
            default:
                return $defaultValue;
        }
    }
 
    public static function buildTools( $unused, LinkRenderer $linkRenderer = null, $selectedMode = false ) {
        if ( !$linkRenderer ) {
            $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
        }
 
        $tools = [];
        $modes = [
            'view' => [ 'Watchlist', false, false ],
            'edit' => [ 'EditWatchlist', false, self::EDIT_NORMAL ],
            'raw' => [ 'EditWatchlist', 'raw', self::EDIT_RAW ],
            'clear' => [ 'EditWatchlist', 'clear', self::EDIT_CLEAR ],
        ];
 
        foreach ( $modes as $mode => $arr ) {
            // can use messages 'watchlisttools-view', 'watchlisttools-edit', 'watchlisttools-raw'
            $link = $linkRenderer->makeKnownLink(
                SpecialPage::getTitleFor( $arr[0], $arr[1] ),
                wfMessage( "watchlisttools-{$mode}" )->text()
            );
            $isSelected = $selectedMode === $arr[2];
            $classes = [
                'mw-watchlist-toollink',
                'mw-watchlist-toollink-' . $mode,
                $isSelected ? 'mw-watchlist-toollink-active' :
                    'mw-watchlist-toollink-inactive'
            ];
            $tools[] = Html::rawElement( 'span', [
                'class' => $classes,
            ], $link );
        }
 
        return Html::rawElement(
            'span',
            [ 'class' => 'mw-watchlist-toollinks mw-changeslist-links' ],
            implode( '', $tools )
        );
    }
}
 
class_alias( SpecialEditWatchlist::class, 'SpecialEditWatchlist' );