[cl-json-devel] Newbie to Lisp question, trying to create JSON

[Henrik Hjelte]

On Thu, Apr 7, 2011 at 4:07 PM, Jim Barrows <jim.barrows at gmail.com> wrote:

> I'm trying to encode a list of plists, and encode-json-plist-to-string
> doesn't appear to do it.


Yes, because the first list is a list and not a plist.


> My newbiness is not seeing a better answer then to loop through the list,
> and encode each plist separately, concatentate the strings together to form
> the array.
>

If you go that route, I would rather wrap a string-stream with
with-output-to-string and encode each individual plist to this stream (not
the -to-string functions) to avoid string concatenation at the end.



>  That doesn't seem too lispy to me.
> Is there a better way?
>

I suggest using the explicit encoder for more control, but then you would
need to change your p-lists slightly.
I assume you want the plists to be json objects, and the list to be a json
array.

Both these examples give the same result:

[{"a":"c","d":"c"},{"foo":true,"bar":false}

;; More json-javascriptish terminolgy
(princ
   (json:with-explicit-encoder
      (json:encode-json-to-string
         '(:array (:object :a "c" :d "c")
                     (:object :foo t :bar (:false))))))

;; More lispish terminology
(princ
   (json:with-explicit-encoder
      (json:encode-json-to-string
         '(:list (:plist :a "c" :d "c")
                 (:plist :foo t :bar (:false))))))

Or you could use the streaming encoder.

/Henrik Hjelte
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