add cetacean cipher encoder and decoder operations, tests. Update .gitignore to exclude idea generated files

src/core/operations/CetaceanCipherDecode.mjs

@@ -0,0 +1,64 @@
+/**
+ * @author dolphinOnKeys [robin@weird.io]
+ * @copyright Crown Copyright 2022
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+
+/**
+ * Cetacean Cipher Decode operation
+ */
+class CetaceanCipherDecode extends Operation {
+
+    /**
+     * CetaceanCipherDecode constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Cetacean Cipher Decode";
+        this.module = "Ciphers";
+        this.description = "Decode Cetacean Cipher input. <br/><br/>e.g. <code>EEEEEEEEEeeEeEEEEEEEEEEEEeeEeEEe</code> becomes <code>hi</code>";
+        this.infoURL = "";
+        this.inputType = "string";
+        this.outputType = "string";
+
+        this.checks = [
+            {
+                pattern: "^(?:[eE]{16,})(?: [eE]{16,})*$",
+                flags: "",
+                args: []
+            }
+        ]
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const binaryArray = [];
+        for ( const char of input ) {
+            if ( char === ' ' ) {
+                binaryArray.push(...[ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0 ]);
+            } else {
+                binaryArray.push( char === 'e' ? 1 : 0 );
+            }
+        }
+
+        const byteArray = [];
+
+        for ( let i = 0;  i < binaryArray.length; i += 16 ) {
+            byteArray.push(binaryArray.slice(i, i + 16).join(''))
+        }
+
+        return byteArray.map( byte =>
+            String.fromCharCode(parseInt( byte , 2 )
+            )
+        ).join('');
+    }
+}
+
+export default CetaceanCipherDecode;