Hi JPatrick,
On Mon, Apr 27, 2015 at 11:50 PM, JPatrick Davenport <virmu...@gmail.com>
wrote:
> Hello,
> So just to get it out: I do not want to evaluate the JavaScript, simply
> preserve it.
>
> I'm working on an ArangoDB driver. Part of the wonder that is ArangoDB is
> its ability to support transactions. This is done using JSON. Part of the
> REST object for a transaction is what I want to do in the transaction. This
> is encapsulated in the "action" attribute of the posted JSON object.
>
> Here's an example
> {...JSON configuration....
> action: "function (){many lines of stuff here",
> ....More JSON configuration}
>
> Now the way that this works in node is by converting the function into a
> String. I didn't know that String(function () {..valid JavaScript...})
> would kick out a string version of the function. Pretty neat.
>
> I want to do the same thing with Clojure. I presently take a map with one
> of the attributes of :action. I want something like this.
> {:some-key :some-value,
> :action (js-macro function(){
> console.log("pretty crappy transaction");
> console.log("another line");
> })}
>
> On the other side of the macro I want to get "function() {\t\t\t\n
> console.log(\"pretty crappy transaction\";\n\t\t\tconsole.log(\"another
> line\");\n} or there about.
>
> I've got
>
> (defmacro js [& js-fun]
>
> (let [body (str js-fun)]
>
> (subs body 1 (- (count body) 1))))
>
> That gets the idea. Unfortunately, I loose the ";" as well as the new
> lines.
>
Your macro thinks it receives the code as a string, but Clojure macros
receive their parameters as s-expressions. Just like functions, with the
only difference functions' params are evaluated.
>
> I'm pretty sure I don't *need* this macro. I can probably get away with
> "function () {
> console.log('println');
> }", but I feel like this would make the code nicer.
>
Perhaps you can write a function that builds a function somewhere and then
outputs a string containing JavaScript code that invokes it.
(defn js [& body]
(eval `(defn fn-name# [] ~@body))
(str "function() { your.ns." fn-name# "(); }"))
(I didn't test the code, it's just to give you an idea.)
>
> Thanks,
> JPD
>
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Kind Regards,
Atamert Ölçgen
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www.muhuk.com
www.olcgen.com
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