Separated out Diff and Windows Filetime operations into their own namespaces as they rely on libraries not used by the rest of the operations in their group

src/core/operations/Diff.js

@@ -0,0 +1,94 @@
+import Utils from "../Utils.js";
+import * as JsDiff from "diff";
+
+
+/**
+ * Diff operations.
+ *
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ *
+ * @namespace
+ */
+const Diff = {
+
+    /**
+     * @constant
+     * @default
+     */
+    DIFF_SAMPLE_DELIMITER: "\\n\\n",
+    /**
+     * @constant
+     * @default
+     */
+    DIFF_BY: ["Character", "Word", "Line", "Sentence", "CSS", "JSON"],
+
+    /**
+     * Diff operation.
+     *
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {html}
+     */
+    runDiff: function(input, args) {
+        let sampleDelim = args[0],
+            diffBy = args[1],
+            showAdded = args[2],
+            showRemoved = args[3],
+            ignoreWhitespace = args[4],
+            samples = input.split(sampleDelim),
+            output = "",
+            diff;
+
+        if (!samples || samples.length !== 2) {
+            return "Incorrect number of samples, perhaps you need to modify the sample delimiter or add more samples?";
+        }
+
+        switch (diffBy) {
+            case "Character":
+                diff = JsDiff.diffChars(samples[0], samples[1]);
+                break;
+            case "Word":
+                if (ignoreWhitespace) {
+                    diff = JsDiff.diffWords(samples[0], samples[1]);
+                } else {
+                    diff = JsDiff.diffWordsWithSpace(samples[0], samples[1]);
+                }
+                break;
+            case "Line":
+                if (ignoreWhitespace) {
+                    diff = JsDiff.diffTrimmedLines(samples[0], samples[1]);
+                } else {
+                    diff = JsDiff.diffLines(samples[0], samples[1]);
+                }
+                break;
+            case "Sentence":
+                diff = JsDiff.diffSentences(samples[0], samples[1]);
+                break;
+            case "CSS":
+                diff = JsDiff.diffCss(samples[0], samples[1]);
+                break;
+            case "JSON":
+                diff = JsDiff.diffJson(samples[0], samples[1]);
+                break;
+            default:
+                return "Invalid 'Diff by' option.";
+        }
+
+        for (let i = 0; i < diff.length; i++) {
+            if (diff[i].added) {
+                if (showAdded) output += "<span class='hl5'>" + Utils.escapeHtml(diff[i].value) + "</span>";
+            } else if (diff[i].removed) {
+                if (showRemoved) output += "<span class='hl3'>" + Utils.escapeHtml(diff[i].value) + "</span>";
+            } else {
+                output += Utils.escapeHtml(diff[i].value);
+            }
+        }
+
+        return output;
+    },
+
+};
+
+export default Diff;