Hi. Am having some trouble composing a transform on a grammar that has an optional field.
A simple example: I'm looking for a formatting code: e.g. " d ", But it could include an optional offset specification: " [16] d " If that optional field is there, I need to grab the number between the brackets. Otherwise, I can assume it to be zero. I can parse both forms ok, But haven't figured out how to build a transform to handle both the presence or absence of the optional digits in brackets. Any suggestions would be greatly appreciated. Thanks.
