ESM: Ported case converters, generic beautifier and syntax highlighting

src/core/lib/Code.mjs

@@ -0,0 +1,31 @@
+/**
+ * Code functions.
+ *
+ * @author n1474335 [n1474335@gmail.com]
+ *
+ * @copyright Crown Copyright 2018
+ * @license Apache-2.0
+ *
+ */
+
+/**
+ * This tries to rename variable names in a code snippet according to a function.
+ *
+ * @param {string} input
+ * @param {function} replacer - this function will be fed the token which should be renamed.
+ * @returns {string}
+ */
+export function replaceVariableNames(input, replacer) {
+    const tokenRegex = /\\"|"(?:\\"|[^"])*"|(\b[a-z0-9\-_]+\b)/ig;
+
+    return input.replace(tokenRegex, (...args) => {
+        const match = args[0],
+            quotes = args[1];
+
+        if (!quotes) {
+            return match;
+        } else {
+            return replacer(match);
+        }
+    });
+}