Recursive Syntax in Oslo
- by Kevin Lawrence
I'm writing my first DSL with Oslo and I am having a problem with a recursive syntax definition.
The input has sections which can contain questions or other sections recursively (composite pattern) like this:
Section: A
Question: 1
Question: 2
Section: B
Question: 1
End
End
My definition for a Section looks like this
syntax Section = "Section:" id:Text
body:(SectionBody)*
"End Section";
Which works (but doesn't handle recursive sections) if I define SectionBody like this
syntax SectionBody = (Question);
but doesn't work with a recursive definition like this
syntax SectionBody = (Question | Section);
What am I missing?
