MultiTitleFilter.php

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<?php
namespace MediaWiki\Preferences;
 
use Title;
use TitleFactory;
 
class MultiTitleFilter implements Filter {
 
    private $titleFactory;
 
    public function __construct( TitleFactory $titleFactory = null ) {
        $this->titleFactory = $titleFactory;
    }
 
    public function filterForForm( $value ) {
        $ids = array_map( 'intval', preg_split( '/\n/', $value, -1, PREG_SPLIT_NO_EMPTY ) );
        $titles = $ids ? $this->getTitleFactory()->newFromIDs( $ids ) : [];
        if ( !$titles ) {
            return '';
        }
        return implode( "\n", array_map( static function ( Title $title ) {
            return $title->getPrefixedText();
        }, $titles ) );
    }
 
    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->getTitleFactory()->newFromText( $text );
                if ( $title instanceof \Title && $title->getArticleID() > 0 ) {
                    return $title->getArticleID();
                }
                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 getTitleFactory(): TitleFactory {
        $this->titleFactory = $this->titleFactory ?? new TitleFactory();
        return $this->titleFactory;
    }
}