This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
(defn topo [graph] | |
(when-not (empty? graph) | |
(lazy-seq | |
(let [n (first (for [[node s] graph | |
:when (not (seq s))] | |
node))] | |
(assert n "if this fails there is a cycle") | |
(cons n (topo (into {} (for [[node deps] graph | |
:when (not= n node)] | |
[node (dissoc deps n)])))))))) | |
(assert (= (topo {:a {:b :b :c :c} :b {:c :c} :c {} :d {:b :b :a :a}}) | |
[:c :b :a :d])) | |
(defn run [transform deps env fun & args] | |
(reduce | |
(fn [env k] | |
(assoc env k (apply fun | |
(into (get env k) | |
(for [[k v] (get deps k)] | |
[v (get env k)])) | |
args))) | |
env | |
(transform (topo deps)))) | |
(defn run-up [deps env fun & args] | |
(apply run identity deps env fun args)) | |
(defn run-down [deps env fun & args] | |
(apply run reverse deps env fun args)) | |
;; (defn printer [name] | |
;; {:start (fn [this] | |
;; (println "starting" name) | |
;; this) | |
;; :stop (fn [this] | |
;; (println "stopping" name) | |
;; this)}) | |
;; (def env {:A (printer :a) | |
;; :B (printer :b) | |
;; :C (printer :c) | |
;; :D (printer :d)}) | |
;; (def deps {:A {} | |
;; :B {} | |
;; :C {:A :x | |
;; :B :y} | |
;; :D {:B :b}}) | |
;; (run-down | |
;; deps | |
;; (run-up deps env (fn [m] | |
;; ((:start m) m))) | |
;; (fn [m] | |
;; ((:stop m) m))) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment