Created
April 11, 2017 01:09
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My take on the google group question found here: https://groups.google.com/forum/#!topic/clojure/oe1Ch1oSlLk
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(ns spec-test.virtual-time | |
(:require [clojure.spec :as s] | |
[clojure.spec.test :as st])) | |
(s/def ::virtual-time | |
(s/or | |
:positive-infinity #{:positive-infinity} | |
:negative-infinity #{:negative-infinity} | |
:number number?)) | |
(s/fdef vt-lt | |
:args (s/cat :left-vt ::virtual-time | |
:right-vt ::virtual-time) | |
:ret boolean? | |
:fn #(let [f (second (:left-vt (:args %))) | |
s (second (:right-vt (:args %))) | |
ret (:ret %)] | |
(cond | |
(and (number? f) | |
(Double/isNaN f)) (false? ret) | |
(and (number? s) | |
(Double/isNaN s)) (false? ret) | |
(= f s) (false? ret) | |
(= :positive-infinity f) (false? ret) | |
(= :positive-infinity s) (true? ret) | |
(= :negative-infinity f) (true? ret) | |
(= :negative-infinity s) (false? ret) | |
(== f s) (false? ret) | |
(< f s) (true? ret) | |
(> f s) (false? ret)))) | |
(s/fdef vt-eq | |
:args (s/cat :left-vt ::virtual-time | |
:right-vt ::virtual-time) | |
:ret boolean? | |
:fn #(if | |
(= (second (:left-vt (:args %))) (second (:right-vt (:args %)))) | |
(true? (:ret %)) | |
(false? (:ret %)))) | |
(s/fdef vt-le | |
:args (s/cat :left-vt ::virtual-time | |
:right-vt ::virtual-time) | |
:ret boolean? | |
:fn #(if (or (vt-eq (second (:left-vt (:args %))) (second (:right-vt (:args %)))) | |
(vt-lt (second (:left-vt (:args %))) (second (:right-vt (:args %))))) | |
(true? (:ret %)) | |
(false? (:ret %)))) | |
(defn vt-lt [left-vt right-vt] | |
(if (or (and (number? left-vt) | |
(Double/isNaN left-vt)) | |
(and (number? right-vt) | |
(Double/isNaN right-vt))) | |
false | |
(case left-vt | |
:negative-infinity | |
(case right-vt | |
:negative-infinity false | |
#_otherwise true) | |
:positive-infinity false | |
;; otherwise: left-vt is a number. | |
(case right-vt | |
:positive-infinity true | |
:negative-infinity false | |
#_otherwise (< left-vt right-vt))))) | |
(defn vt-eq [left-vt right-vt] | |
(= left-vt right-vt)) | |
(defn vt-le [left-vt right-vt] | |
(or (vt-eq left-vt right-vt) | |
(vt-lt left-vt right-vt))) | |
(st/summarize-results (st/check)) |
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