Update the FrequencyAnalyzer to use the frequency string instead.

src/cipher_analytical_machine/analyzers/caesar.clj

@@ -50,10 +50,10 @@
 
 (defn frequency-analizer-get-plaintext
   "Return the plaintext from a ciphertext using simple analizer. The function is case-insensitive."
-  [ciphertext symbols letter-frequences]
+  [ciphertext symbols letter-frequencies-string]
   (let [decrypt (reify Decrypted
                   (decrypt [this message key symbols]
                     (caesar/decrypt-message message key symbols)))]
-    (-> (new FrequencyAnalyzer ciphertext symbols letter-frequences decrypt)
+    (-> (new FrequencyAnalyzer ciphertext symbols letter-frequencies-string decrypt)
         .crack)))
 

src/cipher_analytical_machine/symbols/frequencies.clj

@@ -1,7 +1,17 @@
 (ns cipher-analytical-machine.symbols.frequencies
   (:gen-class))
 
-(def english-letter-frequences {
+(defn map-to-string
+  "Convert the map of frequencies to the frequency string. Letters are sorted by frequency in descending order."
+  [frequency-map]
+  (->> frequency-map
+       (reduce (fn [acc el] (conj acc el)) [])
+       (sort-by last)
+       (map first)
+       (reverse)
+       (apply str)))
+
+(def english-letter-frequencies {
    \a 0.0804
    \b 0.0154
    \c 0.0306
@@ -30,7 +40,7 @@
    \z 0.0009
 })
 
-(def ukrainian-letter-frequences {
+(def ukrainian-letter-frequencies {
    \а 0.064
    \б 0.013
    \в 0.046

src/main/java/cipher_analytical_machine/analyzers/caesar/FrequencyAnalyzer.java

@@ -7,12 +7,14 @@ public class FrequencyAnalyzer {
     private String ciphertext;
     private int key;
     private String symbols;
+    private String symbol_frequences;
     private Decrypted decryptor;
 
-    public FrequencyAnalyzer(String ciphertext, String symbols, Map<Character, Double> symbol_frequences, Decrypted decryptor) {
+    public FrequencyAnalyzer(String ciphertext, String symbols, String symbol_frequences, Decrypted decryptor) {
 	this.ciphertext = ciphertext;
 	this.key = 1;
 	this.symbols = symbols;
+	this.symbol_frequences = symbol_frequences;
 	this.decryptor = decryptor;
     }
 

test/cipher_analytical_machine/symbols/frequencies_test.clj

@@ -0,0 +1,11 @@
+(ns cipher-analytical-machine.symbols.frequencies-test
+  (:require
+   [clojure.test :refer :all]
+   [cipher-analytical-machine.symbols.frequencies :refer :all]))
+
+(deftest calculate-char-index-test
+  (let [symbol-map english-letter-frequencies]
+    (testing "The map must be converted to 'etaoinsrhldcumfpgwybvkxjqz'"
+      (is (= "etaoinsrhldcumfpgwybvkxjqz"
+             (map-to-string symbol-map))))))
+