I'm playing around with a parser combinator library from the paper Monadic Parser Combinators by Hutton and Meijer [1] and came up with this:
https://gist.github.com/3501273 That's just enough to show the error I'm getting when (expr) calls (factor): Clojure 1.4.0 user=> (load-file "expr.clj") #'user/expr user=> (run expr "(5)") IllegalStateException Attempting to call unbound fn: #'user/expr clojure.lang.Var$Unbound.throwArity (Var.java:43) To avoid this error, I coded a new version of the parser (factor) but in this case I use inline calls to (bind) instead of using parser (between), which makes it work: Now using (parser*) inside the definition of (expr): (def expr (bind facfor* ...) Clojure 1.4.0 user=> (load-file "expr.clj") #'user/expr user=> (run expr "(5)") 5 I thought it was a bug but this may have to do with the forward declaration of "expr" and when is deref'ed. After much trying I can't see why this won't work: (def factor (choice (between (match \() (match \)) expr) integer)) But this will: (def factor* (choice (bind (match \() (fn [_] (bind expr (fn [e] (bind (match \)) (fn [_] (result e))))))) integer)) When called from (expr), since the second case just expands the first. [1] http://eprints.nottingham.ac.uk/237/1/monparsing.pdf -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
