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fsm.cljc
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fsm.cljc
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(ns clj-fsm.fsm
"FSM core."
(:require
[clojure.spec.alpha :as s]
[clj-fsm.fsm.helpers :as helpers]
[clj-fsm.fsm.state :as fsm.state]))
;;
;; FSM specifications
;;
(s/def ::name qualified-keyword?)
(s/def ::desc string?)
(s/def ::fsm
(s/keys :req [::name ::desc ::fsm.state/states]))
;;
;; API
;;
(def meta-fsm-key ::fsm)
(defn assign [data fsm]
(if (s/valid? ::fsm fsm)
(vary-meta data assoc meta-fsm-key fsm)
(throw
(ex-info (helpers/format "The given `fsm` is not satisfied by the specification: `%s`" ::fsm)
{:fsm fsm
:problems (s/explain-data ::fsm fsm)}))))
(defn unassign [data]
(vary-meta data dissoc meta-fsm-key))
(defn get-fsm [data]
(get (meta data) meta-fsm-key))
(defn get-fsm-name [data]
(::name (get-fsm data)))
(defn get-fsm-desc [data]
(::desc (get-fsm data)))
(defn get-fsm-states [data]
(::states (get-fsm data)))
(defn get-fsm-initial-state [data]
(some->> data
get-fsm-states
(helpers/find-first #(some? (::fsm.state/initial? (second %))))
first))
;;
;; Protocols
;;
(defprotocol IFSM
"IFSM protocol."
(-assign [data fsm])
(-unassign [data])
(-get-fsm [data])
(-get-fsm-name [data])
(-get-fsm-desc [data])
(-get-fsm-states [data])
(-get-fsm-initial-state [data]))
#?(:clj
(extend-protocol IFSM
Object
(-assign [data fsm]
(assign data fsm))
(-unassign [data]
(unassign data))
(-get-fsm [data]
(get-fsm data))
(-get-fsm-name [data]
(get-fsm-name data))
(-get-fsm-desc [data]
(get-fsm-desc data))
(-get-fsm-states [data]
(get-fsm-states data))
(-get-fsm-initial-state [data]
(get-fsm-initial-state data)))
:cljs
(extend-protocol IFSM
js/Object
(-assign [data fsm]
(assign data fsm))
(-unassign [data]
(unassign data))
(-get-fsm [data]
(get-fsm data))
(-get-fsm-name [data]
(get-fsm-name data))
(-get-fsm-desc [data]
(get-fsm-desc data))
(-get-fsm-states [data]
(get-fsm-states data))
(-get-fsm-initial-state [data]
(get-fsm-initial-state data))))