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(ns statecharts | |
(:require [clojure.set :as set])) | |
(def states | |
(-> (make-hierarchy) | |
(derive ::update ::displays) | |
(derive ::wait ::displays) | |
(derive ::time ::displays) | |
(derive ::date ::displays) | |
(derive ::alarm1 ::displays) | |
(derive ::alarm2 ::displays) | |
(derive ::chime ::displays) | |
(derive ::stopwatch ::displays) | |
(derive ::update1 ::displays) | |
(derive ::update2 ::displays) | |
(derive ::alarm1-off ::alarm1) | |
(derive ::alarm1-on ::alarm1) | |
(derive ::alarm2-off ::alarm2) | |
(derive ::alarm2-on ::alarm2) | |
(derive ::chime-on ::chime) | |
(derive ::chime-off ::chime))) | |
(def transitions | |
{::wait {::2-sec-in-wait ::update | |
::hat-c ::time} | |
::update {::b ::time} | |
::time {::a ::alarm1 | |
::c ::wait | |
::d ::date} | |
::date {::d ::time | |
::2-min-in-date ::time} | |
::alarm1 {::a ::alarm2 | |
::c ::update1} | |
::alarm1-off {::d ::alarm1-on} | |
::alarm1-on {::d ::alarm1-off} | |
::alarm2 {::c ::update2 | |
::a ::chime} | |
::chime {::a ::stopwatch} | |
::stopwatch {::a ::time} | |
::update1 {::b ::alarm1} | |
::update2 {::b ::alarm2} | |
::alarm2-off {::d ::alarm2-on} | |
::alarm2-on {::d ::alarm2-off} | |
::chime-on {::d ::chime-off} | |
::chime-off {::d ::chime-on}}) | |
(def initial-states | |
{::displays ::time | |
::chime ::chime-off | |
::alarm1 ::alarm1-off | |
::alarm2 ::alarm2-off}) | |
(defn state-descendants [s] (into #{s} (descendants states s))) | |
(defn state-ancestors [s] (into #{s} (ancestors states s))) | |
(defn do-step | |
[fsm from to] | |
(let [leaving-set (set/intersection fsm (state-descendants from)) | |
entering-set (state-ancestors to) | |
entering-set (set/difference entering-set fsm) | |
entering-set (into entering-set (keep initial-states entering-set))] | |
{:fsm' (-> fsm | |
(disj leaving-set) | |
(conj entering-set)) | |
:leaving-set leaving-set | |
:entering-set entering-set})) | |
(let [fsm #{::displays ::alarm2 ::alarm2-on} | |
txns (mapcat (comp keys transitions) fsm)] | |
(println "before: " fsm) | |
(doseq [t txns] | |
(doseq [from fsm] | |
(when-let [to (get-in transitions [from t])] | |
(clojure.pprint/pprint | |
{:from from | |
:txn t | |
:to to | |
:step (do-step fsm from to)}))))) |
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