Question: Using functor to store position information

[Centril]

According to bnfc --help:
--functor Make the AST a functor and use it to store the position of the nodes

How would you go about storing the position of the nodes?
The type that

parseProgram = pProgram . myLexer

yields is:

parseProgram :: String -> Err (Program ())

I.e: no position information is added... So does that mean that you have to use something else than happy, or can you get it to add that position information for you?

[pascalh]

If I read the bnfc sources correctly source positions are not supported by the happy backend of bnfc. Actually the lexer generated by alex yields a list of tokens which are annotated with their source positions, but the happy parser ignores them.

[gdetrez]

@pascalh is correct, the help comment describe the intended behavior but I still need to find time to complete the feature. The functor part works but not the position part...

Sorry for the inconsistent documentation 😕.

[Centril]

Any updates on this @gdetrez ?

[gdetrez]

@Centril partly: I have done some work on this but I was interrupted by other things...

I'll try to rebase and push what I already have this week and see if I can finish it soon-ish. Would you be able to provide some feedback?

[Centril]

@gdetrez Sure, what type of feedback do you want? Peer review or testing (or both)?

Just give me a link to the commit at which point to test it

[woehr]

Is there any chance of getting this merged? Can I help somehow?