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camlp4 help
- Pietro Abate
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Date: | 2005-07-15 (08:39) |
From: | Pietro Abate <Pietro.Abate@a...> |
Subject: | camlp4 help |
Hi all, I'm having problems (once again) with camlp4... I'd like to parse and produce a bit of ocaml code out of the following description : --------------------- CONNECTIVES "_&_",AssocLeft,And ; "_v_",AssocLeft,Or END TABLEAU RULE "And" { A & B } ---------- A ; B END END --------------- The first time around I used quotes around the "{A & B}" and parsed the expression with a adhoc parser outside camlp4 (and it's all good and working). Now I want to remove the quotes tut-cur and do everything using the pre-processor (quotes make my code quote un-readable). I've started writing this code below, but I don't know how to proceed... The main problem is of course that I've to parse an expression (in rule), with a generic parser built on the top of the connectives that I've just declared. Is there a way to tell campl4 : pass everything in between RULE and END to a function my_parser ? I was looking for inspiration in M. Jambon excellent tutorial, but without much luck... thanks, p -----------------------(not tested) let rule = Grammar.Entry.create Pcaml.gram "rule";; let connective = Grammar.Entry.create Pcaml.gram "connective";; type assoc = |AssocLeft |AssocRight |AssocNone ;; let conntable = Hashtbl.create 15;; EXTEND Pcaml.str_item: [ "CONNECTIVES"; clist = LIST1 connective SEP ";"; "END" -> List.iter Hashtbl.add conntable clist; <:str_item< value version = "connectives declared" >> |"TABLEAU"; LIST1 rule; "END" -> <:str_item< value version = "tableau declared" >> ]; connective: [ s = STRING; ","; a = UIDENT; ","; r = UIDENT -> (s,a,r) ]; (* how can I write a quotation outside the EXTEND syntax ? *) (* how does this quotation looks like ? *) (* Quotation.add my_parser ??? *) rule: [ "RULE"; r = my_parser ??? "END" -> do_something r ]; END ------------------------ -- ++ Blog: http://blog.rsise.anu.edu.au/?q=pietro ++ ++ "All great truths begin as blasphemies." -George Bernard Shaw ++ Please avoid sending me Word or PowerPoint attachments. See http://www.fsf.org/philosophy/no-word-attachments.html