the SET game in clojure.spec

set-game.clj

;; the SET game in clojure.spec
;; inspired by https://github.com/jgrodziski/set-game

(require '[clojure.spec :as s])

(s/def ::shape #{:oval :diamond :squiggle})
(s/def ::color #{:red :purple :green})
(s/def ::value #{1 2 3})
(s/def ::shading #{:solid :striped :outline})
(s/def ::card (s/keys :req [::shape ::color ::value ::shading]))
(s/def ::deck (s/coll-of ::card :distinct true :max-count 12 :min-count 12))

(defn unique-or-distinct [feature]
  #(not= 2 (count (into #{} (map feature) %)))) ; assumes 3-item set

(s/def ::set
  (s/and
    (s/coll-of ::card :min-count 3 :max-count 3 :distinct true :into #{})
    (unique-or-distinct ::shape)
    (unique-or-distinct ::color)
    (unique-or-distinct ::value)
    (unique-or-distinct ::shading)))
  
(defn deal []
  (first (clojure.test.check.generators/sample (s/gen ::deck) 1)))

(defn sets [deck]
  (into #{}
    (for [carda deck cardb deck cardc deck
          :let [s (hash-set carda cardb cardc)]
          :when (s/valid? ::set s)]
      s)))
    
;;;;;; repl
=> (sets (deal))
#{#{#:user{:shape :oval, :color :purple, :value 1, :shading :outline}
    #:user{:shape :diamond, :color :red, :value 3, :shading :solid}
    #:user{:shape :squiggle, :color :green, :value 2, :shading :striped}}
  #{#:user{:shape :diamond, :color :green, :value 3, :shading :solid}
    #:user{:shape :oval, :color :purple, :value 1, :shading :striped}
    #:user{:shape :squiggle, :color :red, :value 2, :shading :outline}}
  #{#:user{:shape :diamond, :color :green, :value 3, :shading :solid}
    #:user{:shape :oval, :color :purple, :value 2, :shading :solid}
    #:user{:shape :squiggle, :color :red, :value 1, :shading :solid}}}