public LoxFunction FindMethod(LoxInstance instance, string name)
{
LoxFunction ret = null;
if (methods.ContainsKey(name))
{
ret = methods[name].Bind(instance);
}
else if (superclass != null)
{
ret = superclass.FindMethod(instance, name);
}
return(ret);
}
public object Get(Token name)
{
if (fields.ContainsKey(name.lexeme))
{
return(fields[name.lexeme]);
}
LoxFunction method = klass.FindMethod(this, name.lexeme);
if (method != null)
{
return(method);
}
throw new RuntimeError(name, "Undefined property '" + name.lexeme + "'.");
}
public object Visit(Expr.Super expr)
{
int distance = locals[expr];
LoxClass superclass = (LoxClass)environment.GetAt(distance, "super");
// "this" is always one level nearer than "super"'s environment;
LoxInstance obj = (LoxInstance)environment.GetAt(distance - 1, "this");
LoxFunction method = superclass.FindMethod(obj, expr.method.lexeme);
if (method == null)
{
throw new RuntimeError(expr.method, "Undefined property '" + expr.method.lexeme + ".");
}
return(method);
}
public void Visit(Stmt.Function stmt)
{
LoxFunction function = new LoxFunction(stmt, environment, false);
environment.Define(stmt.name.lexeme, function);
}