In case anybody's interested, I'm messing around with a ClojureScript
wrapper type that can implement various core protocols, e.g.:
(deftype ClojureObject [o]
IFn
(-invoke [_] (.invoke o))
(-invoke [_ a] (.invoke o a))
;; etc
)
On 31 December 2012 09:56, Stuart Campbell <stu...@harto.org> wrote:
> OK, unless there's some way to set arbitrary properties on a Java object,
> I guess this isn't possible...
>
> ClojureScript:cljs.user> (aset js/Packages.clojure.lang.IFn "prototype"
> (js/Object.))
> "Error evaluating:" (aset js/Packages.clojure.lang.IFn "prototype"
> (js/Object.)) :as "(Packages.clojure.lang.IFn[\"prototype\"] = (new
> Object()));\n"
> org.mozilla.javascript.EvaluatorException: Java class "clojure.lang.IFn"
> has no public instance field or method named "prototype". (<cljs repl>#9)
> at <cljs repl>:9 (anonymous)
> at <cljs repl>:9
>
>
> On 31 December 2012 09:41, Stuart Campbell <stu...@harto.org> wrote:
>
>> Ah, you're right -- thanks. That leads me to another error:
>>
>> ClojureScript:cljs.user> (extend-type js/Packages.clojure.lang.IFn IFn
>> (-invoke ([this] (.invoke this))))
>> "Error evaluating:" (extend-type js/Packages.clojure.lang.IFn IFn
>> (-invoke ([this] (.invoke this)))) :as
>> "Packages.clojure.lang.IFn.prototype.cljs$core$IFn$ =
>> true;\nPackages.clojure.lang.IFn.prototype.call = (function
>> (this_sym23394){\nvar this_sym23394__23395 = this;\nvar this__23396 =
>> this_sym23394__23395;\nreturn
>> this__23396.invoke();\n});\nPackages.clojure.lang.IFn.prototype.apply =
>> (function (this_sym23392,args23393){\nreturn
>> this_sym23392.call.apply(this_sym23392,[this_sym23392].concat(args23393.slice()));\n});\n"
>> org.mozilla.javascript.EcmaError: TypeError: Cannot set property
>> "cljs$core$IFn$" of null to "true" (<cljs repl>#25)
>> at <cljs repl>:25 (anonymous)
>> at <cljs repl>:25 (anonymous)
>> at <cljs repl>:25
>>
>> I'll keep investigating.
>>
>> On 30 December 2012 12:31, David Nolen <dnolen.li...@gmail.com> wrote:
>>
>>> I think you've just formatted your code incorrectly. Did you try
>>> something like this?
>>>
>>> (extend-type js/Packages.clojure.lang.IFn
>>> IFn
>>> (-invoke
>>> ([this] (.invoke this))
>>> ([this a] (.invoke this a)))
>>> )
>>>
>>>
>>> On Sat, Dec 29, 2012 at 8:22 PM, Stuart Campbell <stu...@harto.org>wrote:
>>>
>>>> Hi all,
>>>>
>>>> I'm toying with a way to use Clojure objects from a Rhino-based
>>>> ClojureScript environment (https://github.com/harto/rhino-bridge).
>>>>
>>>> I've been able to export a Clojure function into the ClojureScript
>>>> environment without too much difficulty. Ideally, I'd like to be able to
>>>> call that function as if it were a regular ClojureScript function.
>>>>
>>>> I was hoping I could do something like:
>>>>
>>>> (extend-type js/Packages.clojure.lang.IFn
>>>> IFn
>>>> (-invoke [this] (.invoke this))
>>>> (-invoke [this a] (.invoke this a))
>>>> ;; etc
>>>> )
>>>>
>>>> However, this yields an error that I don't quite understand:
>>>>
>>>> java.lang.UnsupportedOperationException: nth not supported on this
>>>> type: Symbol
>>>> at clojure.lang.RT.nthFrom(RT.java:846)
>>>> at clojure.lang.RT.nth(RT.java:796)
>>>> at
>>>> cljs.core$extend_type$assign_impls__7365$fn__7377$adapt_params__7380.invoke(core.clj:486)
>>>> at clojure.core$map$fn__4087.invoke(core.clj:2434)
>>>>
>>>> In fact, I'm not sure this will work at all, since (type) doesn't
>>>> appear to work with non-native JS objects.
>>>>
>>>> Is the extend-type method feasible?
>>>>
>>>> Cheers,
>>>> Stuart
>>>>
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>>>
>>>
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>>
>>
>>
>
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