On May 15, 2014, at 3:35 PM, Steven Jones <ple...@gmail.com> wrote:
> Thanks, edn looks like the way to go but your example is not quite
> working. The issue appears to be with pr.
>
> (defn foo [] 'foo)
>
> (def data {0 foo,
> 1 '[a b c]})
>
> (spit filename (pr data))
Use pr-str instead of pr. It returns a string containing the text representing
data.
> Second despite the documentation that pr output is a readable format,
> when I attempt to read it I get a runtime exception of "Unreadable form"
>
>
> (pr foo)
> --> #<core$foo edntest.core$foo@7dce092>nil
>
> #<core$foo edntest.core$foo@7dce092>
> --> RuntimeException Unreadable form clojure.lang.Util.runtimeException
> (Util.java:219)
There is no built-in way to access an existing function value as readable data.
Searching the google group history for serializable function yields some
discussion of the issues involved.
If you have access to the code for the function at the time it's being loaded
into clojure (read and compiled), you can write code to capture the text of the
function definition from there. This lib woks along those lines and might be
useful to you: https://github.com/technomancy/serializable-fn/
You may also want to consider another representation for function values,
something like registering them by name and serializing the name could work. It
depends on how much control you have over the environment around serializing
and deserializing and how general the capabilities of the serialized code need
to be.
--Steve
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