Hi. I've been experimenting with clojure spec and a game of life problem, and have been trying to spec a rectangular board of unknown size made up of a collection of rows, each of which contain an equal number of cells. My initial attempt was:-
(def cell? #{0 1}) (s/def ::row (s/coll-of cell? :min-count 1)) (s/def ::board (s/& (s/+ ::row) #(apply = (map count %)))) This appears to work, but I'm wondering if there is a better way to specify the constraint that every row should be the same length? What would be the recommended way to achieve this? Following on from this, I then wanted to generate input boards and exercise a function so I tried the following which give me an ArityException:- (s/def ::board (s/with-gen (s/& (s/+ ::row) #(apply = (map count %))) #(gen/bind (s/gen pos-int?) (fn [n] (s/gen (s/coll-of (s/coll-of cell? :count n))))))) (s/fdef my-function :args (s/cat :board ::board)) (defn my-function [board]) (s/exercise (:args (s/get-spec `my-function)) 1) => ([([1] [0] [0] [1] [0]) {:board [[1] [0] [0] [1] [0]]}]) (s/exercise-fn `my-function) => ArityException Wrong number of args (20) passed to: user/my-function If I try and do something similar without the custom generator such as: (s/def ::coll (s/coll-of (s/coll-of int? :count 2))) (s/fdef my-function2 :args (s/cat :board ::coll)) (defn my-function2 [board]) (s/exercise (:args (s/get-spec `my-function2)) 1) => ([(*[*[0 -1] [0 -1] [0 -1]*]*) {:board [[0 -1] [0 -1] [0 -1]]}]) (s/exercise-fn `my-function2) This all works as expected. I can see that there is an extra level of nesting here though and this must be where the error is coming from, as it's applying my-function to the collection rather than using it as a single argument - but I'm not sure what is causing this difference. These look the same in terms of structure: (gen/sample (s/gen ::coll) 1) => ([[-1 -1] [-1 0] [0 -1] [-1 -1] [-1 0] [-1 0]]) (gen/sample (s/gen ::board) 1) => ([[0 1] [1 1] [1 1] [1 1] [1 1] [0 0] [0 1]]) (s/fdef my-function :args (s/cat :board ::board)) (s/fdef my-function2 :args (s/cat :board ::coll)) But these don't: (gen/sample (s/gen (:args (s/get-spec `my-function))) 1) => (([1 0] [0 0] [0 1] [0 1] [1 1])) (gen/sample (s/gen (:args (s/get-spec `my-function2))) 1) => (([[-1 -1] [-1 -1] [0 0] [0 0] [-1 0] [-1 -1] [0 0]])) I'm sure it's something obvious, but I been looking for a couple of hours and can't seem to see it - could someone please help point me in the right direction. Thanks in advance. Jason -- Jason Courcoux -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.