Algebraic data types are exactly what I'm looking for, actually. I think
I'll try something like that.
On Saturday, 5 March 2016 16:28:22 UTC-8, Bobby Eickhoff wrote:
>
> Note also that I'm giving each Zone "object" it's own :type property.
> That's how I'm able to dispatch on the type. It also plays well with
> multimethods.
>
> On Saturday, March 5, 2016 at 7:26:27 PM UTC-5, Bobby Eickhoff wrote:
>>
>> It sounds like what you're describing is (structurally) an algebraic data
>> type, i.e. a generic type with specific variants. I've been able to do
>> something like this in my own projects. Here I'm considering Zone the
>> general type and each variant is Zone:Hand, Zone:Deck, &c.
>>
>> (def Zone:Hand
>> ...)
>>
>> (def Zone:Deck
>> ...)
>>
>> (def Zone
>> (s/conditional
>> #(= (:type %) :Hand) Zone:Hand
>> #(= (:type %) :Deck) Zone:Deck
>> ...))
>>
>> Does that help?
>>
>> On Saturday, March 5, 2016 at 6:58:31 PM UTC-5, JvJ wrote:
>>>
>>> I've been using Schema, and there's a kind of type definition that I'm
>>> having trouble with. I'm not sure exactly how to describe it, so I'll
>>> provide an example.
>>>
>>> I'm working on a digital card game in which there are numerous zones
>>> that a card may be in. Each card needs to know which zone it is in, and
>>> there may be additional information depending on the zone.
>>>
>>> For instance, if a card is in a player's hand, no additional information
>>> is required. However, if the card is on the board, it needs to understand
>>> its position on the board.
>>>
>>> I have the following definition for zone types:
>>>
>>> (def Zone
>>> "A schema for referring to the various game zones."
>>> (s/enum :Hand
>>> :Deck
>>> :Board
>>> :Field
>>> :Discard
>>> :Void))
>>>
>>> I want to define a different schema type for each of these, and then
>>> define a zone spec:
>>>
>>> (def ZoneSpec {(required-key :zone-type) Zone
>>> :data <zone data corresponding to the zone type
>>> specified earlier>
>>> })
>>>
>>> I want to ensure that whichever data is provided specified the schema
>>> associated with the zone type.
>>>
>>> Is there a way to do this?
>>>
>>> Thanks.
>>>
>>
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