const string Name = "John";
var context = new KeyValuePair<string, string>(nameof(Name), Name);
var interpreter = new Interpreter().SetVariable("this", context);

Assert.AreEqual(Name, interpreter.Eval("this.Value"));
Assert.AreEqual(Name, interpreter.Eval("Value"));

const string Name = "John";
var context = new KeyValuePair<string, string>(nameof(Name), Name);
var parameter = new Parameter("this", context.GetType());
var interpreter = new Interpreter();

Assert.AreEqual(Name, interpreter.Parse("this.Value", parameter).Invoke(context));
Assert.AreEqual(Name, interpreter.Parse("Value", parameter).Invoke(context));