Created
June 28, 2016 08:18
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(defn- parse-cron-part-range | |
[p] | |
(let [ab (split p #"-") | |
a (read-string (first ab)) | |
b (read-string (second ab))] | |
(assert (< a b)) | |
(range a (inc b)))) | |
(defn- parse-cron-part | |
[p] | |
(cond (nil? p) nil | |
(contains? #{"*" "?"} p) nil | |
(.contains p ",") (flatten (for [sp (split p #",")] | |
(parse-cron-part sp))) | |
(.contains p "-") (parse-cron-part-range p) | |
:else [(read-string p)])) | |
(defn- parse-cron | |
[c] | |
(let [parts (split c #"\s+") | |
dows (parse-cron-part (get parts 4))] | |
(assert (<= 5 (count parts) 6)) | |
{:minute (parse-cron-part (get parts 0)) | |
:hour (parse-cron-part (get parts 1)) | |
:day (parse-cron-part (get parts 2)) | |
:month (parse-cron-part (get parts 3)) | |
:dow (if dows (map #(mod % 7) dows) | |
nil) | |
:year (parse-cron-part (get parts 5))})) | |
(defn- psql-list | |
[values] | |
(->> (join "," values) | |
(format "(%s)"))) | |
(defn- psql-sentence | |
[k field list] | |
(format "EXTRACT(%s FROM %s) IN %s" (name k) field list)) | |
(defn- generate-query | |
[spec field] | |
(->> (for [[k v] spec] | |
(when v (->> (psql-list v) | |
(psql-sentence k field)))) | |
(filter not-empty) | |
(join " AND ") | |
(format "(%s)"))) | |
(defn cron->psql | |
[cron field] | |
(-> (parse-cron cron) | |
(generate-query field))) |
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