LuaLibrary.php

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<?php
 
namespace MediaWiki\Extensions\ParserFunctions;
 
use Scribunto_LuaError;
use Scribunto_LuaLibraryBase;
 
class LuaLibrary extends Scribunto_LuaLibraryBase {
    public function register() {
        $lib = [
            'expr' => [ $this, 'expr' ],
        ];
 
        return $this->getEngine()->registerInterface(
            __DIR__ . '/mw.ext.ParserFunctions.lua', $lib, []
        );
    }
 
    public function expr( $expression = null ) {
        $this->checkType( 'mw.ext.ParserFunctions.expr', 1, $expression, 'string' );
        try {
            return [ ParserFunctions::getExprParser()->doExpression( $expression ) ];
        } catch ( ExprError $e ) {
            throw new Scribunto_LuaError( $e->getMessage() );
        }
    }
 
}