private static Expression ParseExpression(string code)
 {
     var parser = new MuteScriptParser();
     var lexer = new MuteGrammarLexer(new Antlr4.Runtime.AntlrInputStream(code));
     var muteParser = new MuteGrammarParser(new Antlr4.Runtime.UnbufferedTokenStream(lexer));
     var exp = muteParser.expression();
     return (Expression)parser.VisitExpression(exp);
 }