How do I remove from a nested datastructure the objects whose (pr obj)
representation doesn't comply with the EDN specification? Fx,
{:a 1 :b (find-ns 'user)} → {:a 1}
Or, easier, how do I just not print these objects?
I want to extract the metadata maps from arbitrary Clojure objects and
write them to files. Metadata maps allow arbitrary objects as keys and
values. Of course I want to be able to read the files again, preferably
with clojure.edn/read. I am aware that the Clojure printing system is
extensible and therefore it's not possible to define a sensible predicate
like (re-readable? x). So I was looking for a way to convince the printing
system just to ignore objects that would otherwise end up with a #< in the
output. I didn't find any.
What I found was this:
http://dev.clojure.org/pages/viewpage.action?pageId=8192126 and tried out
Fipp, but it also just prints out #< objects. The
(assert (= (clojure.edn/read-string (pr-str value)) value))
might work. But it's extremely ugly and probably also slow. For nested data
structure I'd expect it to get even uglier. Hmm, on second glance, I might
be able to extend Fipp to do what I want. Still, I'd appreciate any other
ideas.
Richard
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