add new operation: Swap case

src/core/operations/SwapCase.mjs

@@ -0,0 +1,77 @@
+/**
+ * @author mikecat
+ * @copyright Crown Copyright 2023
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+
+/**
+ * Swap case operation
+ */
+class SwapCase extends Operation {
+
+    /**
+     * SwapCase constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Swap case";
+        this.module = "Default";
+        this.description = "Converts uppercase letters to lowercase ones, and lowercase ones to uppercase ones.";
+        this.infoURL = "";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        let result = "";
+        for (let i = 0; i < input.length; i++) {
+            const c = input.charAt(i);
+            const upper = c.toUpperCase();
+            if (c === upper) {
+                result += c.toLowerCase();
+            } else {
+                result += upper;
+            }
+        }
+        return result;
+    }
+
+    /**
+     * Highlight Swap case
+     *
+     * @param {Object[]} pos
+     * @param {number} pos[].start
+     * @param {number} pos[].end
+     * @param {Object[]} args
+     * @returns {Object[]} pos
+     */
+    highlight(pos, args) {
+        return pos;
+    }
+
+    /**
+     * Highlight Swap case in reverse
+     *
+     * @param {Object[]} pos
+     * @param {number} pos[].start
+     * @param {number} pos[].end
+     * @param {Object[]} args
+     * @returns {Object[]} pos
+     */
+    highlightReverse(pos, args) {
+        return pos;
+    }
+
+}
+
+export default SwapCase;