Just wanted to update with an experience report. I wound up writing a
native module myself, since the json-to-elm project doesn't have a
published package and the native module was not in the Elm 0.17 format. (It
also returns an empty JSON object if there is a parse exception, rather
than a Result, which I need.)
Everything worked nicely once I figured out the format for writing native
modules (which I understand is subject to change).
On Fri, Jul 29, 2016 at 4:56 PM, Paul Blair <psfbl...@gmail.com> wrote:
> Thanks, Duane; that looks promising. I'll try that out.
>
>
> On Jul 29, 2016, 4:54 PM -0400, Duane Johnson <duane.john...@gmail.com>,
> wrote:
>
> I wonder if the `json-to-elm` project includes what you're looking for. I
> see a Types.elm file that includes a toValue function:
>
> toValue : String -> Json.Value
>> toValue =
>> Native.Types.toValue
>>
>
> And in the Native.Types module, a definition of toValue that uses native
> javascript:
>
> var toValue = function(text){
>> try {
>> return JSON.parse(text);
>> } catch (e) {
>> return {};
>> }
>> };
>>
>
>
>
>
> On Fri, Jul 29, 2016 at 2:33 PM, Paul Blair <cir...@phobot.net> wrote:
>
>> Duane, the dictionary has string keys; its values are just values of a
>> union type--they are not modules in themselves, but just tags that the case
>> statement can key on in order to decide on which module to send the message
>> to.
>>
>> On the second point, the top-level component knows enough about the
>> incoming message to get the value from the message_type key. The type of
>> the data field is opaque to the top-level; the top-level just sees it as
>> Json.Value. This does in fact work; it's just hard to test.
>>
>>
>> On Fri, Jul 29, 2016 at 3:47 PM, Duane Johnson <duane.john...@gmail.com>
>> wrote:
>>
>>>
>>> On Fri, Jul 29, 2016 at 12:52 PM, Paul Blair <psfbl...@gmail.com> wrote:
>>>
>>>> toMessage : FromServer -> Message
>>>> toMessage incoming =
>>>> case Dict.get incoming.message_type componentDictionary of
>>>> Just MyInnerComponent ->
>>>> InnerComponentModule.toMessage incoming |>
>>>> MyInnerComponentMessageWrapper
>>>> Nothing ->
>>>> ...
>>>>
>>>
>>>
>>> I'm still learning Elm, so forgive that this is not necessarily going to
>>> be expert advice :)
>>>
>>> My first question is, what is the type of `componentDictionary`? It
>>> looks to me like it has `String` type keys, but then I don't understand
>>> what the type signature of the value is. `Maybe type`? How can you match on
>>> `Just MyInnerComponent`?
>>>
>>> Second question: it seems like the top-level component *must* know
>>> something about the messages in order to route to subcomponents. Can you
>>> include a list of json keys in that routing information, so that you can
>>> pass a narrower scope of data into each subcomponent? It seems like if you
>>> can, that would make your testing story a lot easier.
>>>
>>> Duane
>>>
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