BNF grammar for D?

[Kingsley via Digitalmars-d]

> Hi Bruno,
>
> Thanks very much. I do have a couple of questions about DDT in 
> relation to my plugin.
>
> Firstly - I'm not too familiar with parsing/lexing but at the 
> moment the Psi Structure I have implemented that comes from the 
> DDT parser/lexer is not in any kind of hierarchy. All the 
> PsiElements are available but all at the same level. Is this 
> how the DDT parser works? Or is it down to my implementation of 
> the Parser/Lexer that wraps it to create some hierarchy.
>
> For intellij it's going to be vastly easier to have a hierarchy 
> with nested elements in order to get hold of a structure 
> representing a class or a function for example - in order to do 
> things like get the start and end lines of a class definition 
> in order to apply code folding and to use for searching for 
> classes and stuff.
>
> Secondly - how active it the development of DDT - does it keep 
> up with the D2 releases.
>
> --Kingsley

After doing a bit more research it looks like I have to create 
the psi hierarchy myself - my current psi structure is flat 
because I'm just converting the DeeTokens into PsiElements 
directly. I've still got some experimentation to do. On the plus 
side I implemented commenting, code folding but everything else 
needs a psi hierarchy