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core.clj
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core.clj
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(ns java-properties.core
(:require [clojure.java.io :as io]
[clojure.string :as s]
[clojure.edn :refer [read-string]]
[clojure.pprint :refer [pprint]])
(:import (java.util Properties Date)
(java.io Reader StringWriter)
(java.time.format DateTimeFormatter DateTimeParseException)
(java.time Instant)))
(defn load-props [file]
(with-open [^Reader reader (io/reader file)]
(let [props (Properties.)]
(.load props reader)
(into {} (for [[k v] props]
[k (read-string v)])))))
(defn split-comma-separated [s]
(->> (s/split s #",")
(map s/trim)))
(defn map-vals [f m]
(into {} (for [[k v] m] [k (f v)])))
(defn map-keys [f m]
(into {} (for [[k v] m] [(f k) v])))
(defn remove-vals [f m]
(->> m
(remove #(-> % second f))
(into {})))
(defn pretty [& args]
(s/trimr
(let [out (StringWriter.)]
(doseq [arg args]
(pprint arg out))
(.toString out))))
(defn- kebab-to-camelcase [k]
(let [parts (-> k
name
(s/split #"\-"))]
(-> (first parts)
(cons (->> parts
next
(map s/capitalize)))
s/join
keyword)))
(defn kebab-conf-to-camelcase [conf]
(map-keys kebab-to-camelcase conf))
(def ^:private datetime-formatters (mapv #(DateTimeFormatter/ofPattern %)
["yyyy-MM-dd'T'HH:mm:ss[.SSS]X"
"yyyy-MM-dd HH:mm:ss[.SSS]X"
"yyyy-MM-dd'T'HH:mm:ss.SSSSSSX"
"yyyy-MM-dd HH:mm:ss.SSSSSSX"]))
(defn parse-java-util-date [^String s]
(loop [formatters datetime-formatters]
(or
(try
(->> s (.parse (first formatters)) Instant/from Date/from)
(catch DateTimeParseException e
(when-not (second formatters)
(throw e))))
(recur (next formatters)))))
(defn merge-common [d keyword]
(let [c (get d keyword)]
(->> (dissoc d keyword)
(map (fn [[k d]] [k (merge c d)]))
(into {}))))
(defn ordered-configs [d]
(->> d
keys
sort
(map #(-> (get d %)
(assoc :key %)))))
(defn hex [ba]
(->> (map #(format "%02x" %) ba)
(apply str)))
(defn unhex [s]
(->> (partition 2 s)
(map #(Integer/parseInt (apply str %) 16))
byte-array))
(def ^:private pairs (atom {}))
(defn extract-strings [line]
(let [line' (-> line
(s/replace #"\[(\d+)\]\." ".$1.")
(s/replace #"\[(\d+)\]\s*=" ".$1=")
(s/replace #"\[(\d+)\]" ".$1.")
(s/replace #"\.+" ".")
(s/replace #"\.+$" ""))
strings (re-seq #"\"[^\"]+\"" line')]
(if (empty? strings)
line'
(loop [li line' st strings]
(let [term (first st)
hashed (some-> term .getBytes hex)]
(swap! pairs assoc hashed (some-> term (s/replace "\"" "") keyword))
(if (empty? st) li
(recur (s/replace li term hashed) (rest st))))))))
(declare group-config)
(defn- deeper [d]
(if (contains? d nil)
(get d nil)
(group-config d)))
(defn- strip-prefix [pairs]
(->> pairs
(map-keys #(second (s/split % #"\." 2)))
deeper))
(defn- compile-dict [d]
(->> d
(group-by #(keyword (first (s/split (first %) #"\."))))
(map-vals strip-prefix)))
(defmacro ^:private idxv? [x]
`(and (int? ~x)
(or (pos? ~x) (zero? ~x))))
(defn- idx? [v]
(try
(-> v name read-string idxv?)
(catch NumberFormatException _ false)))
(declare convert-arrays)
(defn- sparsed-array [m]
(let [idxs (map #(-> % name read-string num) (keys m))
size (apply max idxs)]
(vec (for [x (range 0 (inc size))
:let [val (get m (-> x str keyword))]]
(convert-arrays val)))))
(defn- convert-arrays [val]
(if (map? val)
(if (every? idx? (keys val))
(sparsed-array val)
(into {}
(for [[k v] val]
[k (convert-arrays v)])))
val))
(defn- swap-pair* [k]
(get @pairs (name k) k))
(defn- restore-keys [d]
(map-keys swap-pair* d))
(defn- group-config [d & [{with-arrays :with-arrays}]]
(cond->> (map-keys extract-strings d)
true compile-dict
with-arrays convert-arrays
(not-empty @pairs) restore-keys))
(defn load-config [app-name & [{:keys [config] :as options}]]
(let [conf-dict (group-config
(merge
(some-> app-name (str ".properties") io/resource load-props)
(when config
(some-> config io/file load-props)))
options)]
(reset! pairs {})
conf-dict))