Manchester encoding and decoding

src/core/operations/ManchesterDecode.mjs

@@ -0,0 +1,68 @@
+/**
+ * @author mt3571 [[email protected]]
+ * @copyright Crown Copyright 2020
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+import OperationError from "../errors/OperationError.mjs";
+
+/**
+ * Manchester decoding operation
+ */
+class ManchesterDecode extends Operation {
+
+    /**
+     * ManchesterDecode constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Manchester Decode";
+        this.module = "Encodings";
+        this.description = "Decodes data that has been encoded using the Manchester Encoding (also known as phase encoding). A <code>01</code> is converted to <code>1</code> and a <code>10</code> is converted to <code>0</code>. <br><br>As every bit is encoded into two bits when using this encoding, inputs must be a multiple of 2 long.";
+        this.infoURL = "https://en.wikipedia.org/wiki/Manchester_code";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [];
+        this.checks = [
+            {
+                pattern: "(01|10)*",
+                flags: "",
+                args: []
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const decoding = [];
+
+        if (input.length % 2 != 0){
+            throw new OperationError(`Length of an input should be a multiple of 2, the input is ${input.length} long.`);
+        }
+
+        for (let i = 0; i < input.length; i +=2){
+            const bit1 = input[i];
+            const bit2 = input[i+1];
+
+            if (bit1 == 1 && bit2 == 0){
+                decoding.push(0);
+            } else if (bit1 == 0 && bit2 == 1){
+                decoding.push(1);
+            } else {
+                throw new OperationError(`Invalid input.`);
+            }
+
+        }
+        const output = decoding.join("");
+        return output;
+    }
+
+}
+
+export default ManchesterDecode;

src/core/operations/ManchesterEncode.mjs

@@ -0,0 +1,58 @@
+/**
+ * @author mt3571 [[email protected]]
+ * @copyright Crown Copyright 2020
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+import OperationError from "../errors/OperationError.mjs";
+
+/**
+ * Manchester encoding operation
+ */
+class ManchesterEncode extends Operation {
+
+    /**
+     * ManchesterEncode constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Manchester Encode";
+        this.module = "Encodings";
+        this.description = "Performs the Manchester encoding on the data (also known as phase encoding). A <code>1</code> is converted to <code>01</code> and a <code>0</code> is converted to <code>10</code>. ";
+        this.infoURL = "https://en.wikipedia.org/wiki/Manchester_code";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const encoding = [];
+
+        for (let i = 0; i < input.length; i ++){
+            const bit = input[i];
+
+            if (bit == 0){
+                encoding.push(1);
+                encoding.push(0);
+            } else if (bit == 1){
+                encoding.push(0);
+                encoding.push(1);
+            } else {
+                throw new OperationError(`Invalid input character ${bit}. Input should be in binary.`);
+            }
+
+        }
+        const output = encoding.join("");
+        return output;
+    }
+
+}
+
+export default ManchesterEncode;