From b2e0b8613c30fffffd7ecfcd8019703c4b5eedde Mon Sep 17 00:00:00 2001
From: mt3571 <mt3571@protonmail.com>
Date: Mon, 30 Nov 2020 10:37:20 +0000
Subject: [PATCH] First pass at making a ManchesterEncoding and Decoding

---
 src/core/operations/ManchesterDecode.mjs | 60 ++++++++++++++++++++++++
 src/core/operations/ManchesterEncode.mjs | 55 ++++++++++++++++++++++
 2 files changed, 115 insertions(+)
 create mode 100644 src/core/operations/ManchesterDecode.mjs
 create mode 100644 src/core/operations/ManchesterEncode.mjs

diff --git a/src/core/operations/ManchesterDecode.mjs b/src/core/operations/ManchesterDecode.mjs
new file mode 100644
index 00000000..9f167562
--- /dev/null
+++ b/src/core/operations/ManchesterDecode.mjs
@@ -0,0 +1,60 @@
+/**
+ * @author mt3571 [mt3571@protonmail.com]
+ * @copyright Crown Copyright 2020
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+
+/**
+ * Manchester decoding operation
+ */
+class ManchesterDecode extends Operation {
+
+    /**
+     * ManchesterDecode constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Manchester Decode";
+        this.module = "Encodings";
+        this.description = "";
+        this.infoURL = "";
+        this.inputType = "binaryArray";
+        this.outputType = "binaryArray";
+        this.args = [];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const result = [];
+
+        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){
+                result.push(0);
+            } else if (bit1 == 0 && bit2 == 1){
+                result.push(1);
+            } else {
+                throw new OperationError(`Invalid input.`);
+            }
+
+        }
+
+        return result;
+    }
+
+}
+
+export default ManchesterDecode;
diff --git a/src/core/operations/ManchesterEncode.mjs b/src/core/operations/ManchesterEncode.mjs
new file mode 100644
index 00000000..406b235e
--- /dev/null
+++ b/src/core/operations/ManchesterEncode.mjs
@@ -0,0 +1,55 @@
+/**
+ * @author mt3571 [mt3571@protonmail.com]
+ * @copyright Crown Copyright 2020
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+
+/**
+ * Manchester encoding operation
+ */
+class ManchesterEncode extends Operation {
+
+    /**
+     * ManchesterEncode constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Manchester Encode";
+        this.module = "Encodings";
+        this.description = "";
+        this.infoURL = "";
+        this.inputType = "binaryArray";
+        this.outputType = "binaryArray";
+        this.args = [];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const result = [];
+
+        for (let i = 0; i < input.length; i ++){
+            const bit = input[i];
+
+            if (bit == 0){
+                result.push(1);
+                result.push(0);
+            } else {
+                result.push(0);
+                result.push(1);
+            }
+
+        }
+
+        return result;
+    }
+
+}
+
+export default ManchesterEncode;