MultiTitleFilter.php

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<?php
namespace MediaWiki\Preferences;
 
use MediaWiki\MediaWikiServices;
use MediaWiki\Page\PageStore;
use MediaWiki\Page\ProperPageIdentity;
use MediaWiki\Title\TitleFactory;
use MediaWiki\Title\TitleFormatter;
 
class MultiTitleFilter implements Filter {
 
    private $pageStore;
 
    private $titleFormatter;
 
    public function __construct(
        TitleFactory $titleFactory = null, PageStore $pageStore = null, TitleFormatter $titleFormatter = null ) {
        $this->pageStore = $pageStore;
        $this->titleFormatter = $titleFormatter;
    }
 
    public function filterForForm( $value ) {
        $ids = array_map( 'intval', preg_split( '/\n/', $value, -1, PREG_SPLIT_NO_EMPTY ) );
        $pageRecords = $this->getPageStore()
            ->newSelectQueryBuilder()
            ->wherePageIds( $ids )
            ->caller( __METHOD__ )
            ->fetchPageRecords();
        return implode( "\n", array_map( function ( $pageRecord ) {
            return $this->getTitleFormatter()->getPrefixedText( $pageRecord );
        }, iterator_to_array( $pageRecords ) ) );
    }
 
    public function filterFromForm( $titles ) {
        $titles = trim( $titles );
        if ( $titles !== '' ) {
            $titles = preg_split( '/\n/', $titles, -1, PREG_SPLIT_NO_EMPTY );
            $ids = array_map( function ( $text ) {
                $title = $this->getPageStore()->getPageByText( $text );
                if ( $title instanceof ProperPageIdentity && $title->getId() > 0 ) {
                    return $title->getId();
                }
                return false;
            }, $titles );
            if ( $ids ) {
                return implode( "\n", $ids );
            }
        }
        // If the titles list is null, it should be null (don't save) rather than an empty string.
        return null;
    }
 
    private function getPageStore(): PageStore {
        $this->pageStore ??= MediaWikiServices::getInstance()->getPageStore();
        return $this->pageStore;
    }
 
    private function getTitleFormatter(): TitleFormatter {
        $this->titleFormatter ??= MediaWikiServices::getInstance()->getTitleFormatter();
        return $this->titleFormatter;
    }
}