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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