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| (ns instagenerate.strlenc | |
| (:refer-clojure :exclude [==]) | |
| (:require [clojure.core.logic :as l :refer [run* fresh ==]] | |
| [clojure.core.logic.protocols :as lp]) | |
| (:import [clojure.core.logic LCons])) | |
| (defn lcount [l] | |
| (loop [i 0 l l] | |
| (println i l) | |
| (if (and (= LCons (type l)) (.d l)) | |
| (recur (if (char? (.a l)) (inc i) i) | |
| (.d l)) | |
| i))) | |
| (defn -strlenc | |
| ([str len] | |
| (reify | |
| lp/IConstraintStep | |
| (-step [this s] | |
| (reify | |
| clojure.lang.IFn | |
| (invoke [_ s] | |
| (let [str (lp/walk s str)] | |
| (let [cf (if (= (type str) LCons) | |
| lcount | |
| count)] | |
| (when (<= (cf str) len) | |
| ((l/remcg this) s))))) | |
| lp/IRunnable | |
| (-runnable? [_] | |
| (l/ground-term? str s)))) | |
| lp/IConstraintOp | |
| (-rator [_] | |
| `strlenc) | |
| (-rands [_] | |
| [str len]) | |
| lp/IReifiableConstraint | |
| (-reifyc [_ v r s] | |
| `(strlenc ~str ~len)) | |
| lp/IConstraintWatchedStores | |
| (-watched-stores [this] #{::subst})))) | |
| (defn strlenc | |
| [str len] | |
| (l/cgoal (-strlenc str len))) |
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