private object LookUpVariable(Token name, Expr expr)
{
if (locals.TryGetValue(expr, out int distance))
{
return(environment.GetAt(distance, name.Lexeme));
}
else
{
return(Globals.Get(name));
}
}
public object Get(Token name)
{
if (values.TryGetValue(name.Lexeme, out object value))
{
return(value);
}
if (Enclosing != null)
{
return(Enclosing.Get(name));
}
throw new RuntimeException(name, $"Undefined variable '{name.Lexeme}'.");
}
