<div dir="ltr">Ah, if I remove the type variables from the FFI urs and keep some phantom type variables in the wrapper urs, it seems to work! Thanks!<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, May 21, 2017 at 8:27 PM, Artyom Shalkhakov <span dir="ltr"><<a href="mailto:artyom.shalkhakov@gmail.com" target="_blank">artyom.shalkhakov@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">2017-05-22 9:19 GMT+06:00 Aistis Raulinaitis <<a href="mailto:sheganinans@gmail.com">sheganinans@gmail.com</a>>:<br>
> Hmm, that makes sense. Do you have an example of FFI with an abstract type?<br>
> I tried to encapsulate the map type with a con, but obviously that does not<br>
> work..<br>
><br>
<br>
</span>Sure, here are two examples:<br>
<br>
<a href="https://github.com/bbarenblat/urweb-regex" rel="noreferrer" target="_blank">https://github.com/bbarenblat/<wbr>urweb-regex</a> (in particular, take a look<br>
at regex__FFI.urs and the two types [substring_t] and<br>
[substring_list_t])<br>
<a href="https://github.com/ashalkhakov/urweb-storage" rel="noreferrer" target="_blank">https://github.com/<wbr>ashalkhakov/urweb-storage</a> (shameless plug; in<br>
particular, take a look at storage__FFI.urs and the type [storage])<br>
<div class="HOEnZb"><div class="h5"><br>
> On Sun, May 21, 2017 at 8:10 PM, Artyom Shalkhakov<br>
> <<a href="mailto:artyom.shalkhakov@gmail.com">artyom.shalkhakov@gmail.com</a>> wrote:<br>
>><br>
>> 2017-05-22 6:22 GMT+06:00 Aistis Raulinaitis <<a href="mailto:sheganinans@gmail.com">sheganinans@gmail.com</a>>:<br>
>> > So I am working with the JS FFI, however it seems that the clientOnly<br>
>> > directive is being ignored.<br>
>> ><br>
>> > Here is the example code:<br>
>> ><br>
>> > ~~~<br>
>> > main.urp:<br>
>> > ~~~<br>
>> ><br>
>> > ffi js_map<br>
>> > jsFunc Js_map.new_map=new_map<br>
>> > jsFunc Js_map.new_map_with=new_map_<wbr>with<br>
>> > clientOnly Js_map.new_map<br>
>> > clientOnly Js_map.new_map_with<br>
>> > benignEffectful Js_map.new_map<br>
>> > benignEffectful Js_map.new_map_with<br>
>> > jsFile js_map.js<br>
>> ><br>
>> > main<br>
>> ><br>
>> ><br>
>> > ~~~<br>
>> > main.urs:<br>
>> > ~~~<br>
>> ><br>
>> > val main : unit -> transaction page<br>
>> ><br>
>> ><br>
>> > ~~~<br>
>> > main.ur:<br>
>> > ~~~<br>
>> ><br>
>> > fun main () =<br>
>> > c <- Js_map.new_map_with ((1, 2)::[]);<br>
>> > return <xml></xml><br>
>> ><br>
>> ><br>
>> > ~~~<br>
>> > js_map.urs:<br>
>> > ~~~<br>
>> ><br>
>> > con js_map :: Type -> Type -> Type<br>
>> ><br>
>> > val new_map : k ::: Type -> v ::: Type -> unit -> transaction<br>
>> > (js_map k<br>
>> > v)<br>
>> > val new_map_with : k ::: Type -> v ::: Type -> list (k * v) -><br>
>> > transaction<br>
>> > (js_map k v)<br>
>> ><br>
>> ><br>
>> > ~~~<br>
>> > js_map.js:<br>
>> > ~~~<br>
>> ><br>
>> > function new_map () {return new Map ();}<br>
>> ><br>
>> > function new_map_with (arg) {return new Map (arg); }<br>
>> ><br>
>> ><br>
>> > ~~~<br>
>> > So in main.ur, you can see that I am calling this Js code in a C<br>
>> > context,<br>
>> > instead of getting an error complaining about how it should be called on<br>
>> > the<br>
>> > client, instead I get this confusing error:<br>
>> ><br>
>> > urweb main<br>
>> > /Users/ace/src/cli_only/js_<wbr>map.urs:4:75: (to 4:87) Unsupported type<br>
>> > constructor<br>
>> > Constructor: FFI(Js_map.js_map_with) FFI(Basis.int) FFI(Basis.int)<br>
>> > /usr/local/Cellar/urweb/<wbr>20170105/lib/urweb/ur/basis.<wbr>urs:127:23: (to<br>
>> > 127:25)<br>
>> > Unsupported type constructor<br>
>> > Constructor: FFI(Js_map.js_map_with) FFI(Basis.int) FFI(Basis.int)<br>
>> > make: *** [all] Error 1<br>
>> ><br>
>><br>
>> I got the impression that Ur/Web being a whole-program optimizing<br>
>> compiler, the only types being supported for marshalling between FFI<br>
>> code and non-FFI code are primitive types and abstract types. I think<br>
>> I asked this same question some time ago.<br>
>><br>
>> So it looks like you will have to work around this somehow.<br>
>><br>
>> ><br>
>> ><br>
>> > ______________________________<wbr>_________________<br>
>> > Ur mailing list<br>
>> > <a href="mailto:Ur@impredicative.com">Ur@impredicative.com</a><br>
>> > <a href="http://www.impredicative.com/cgi-bin/mailman/listinfo/ur" rel="noreferrer" target="_blank">http://www.impredicative.com/<wbr>cgi-bin/mailman/listinfo/ur</a><br>
>> ><br>
>><br>
>><br>
>><br>
>> --<br>
>> Cheers,<br>
>> Artyom Shalkhakov<br>
>><br>
>> ______________________________<wbr>_________________<br>
>> Ur mailing list<br>
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><br>
><br>
><br>
> ______________________________<wbr>_________________<br>
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><br>
<br>
<br>
<br>
--<br>
Cheers,<br>
Artyom Shalkhakov<br>
<br>
______________________________<wbr>_________________<br>
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</div></div></blockquote></div><br></div>