Adding mirror feature, resolves #31

src/replace-words.js

@@ -41,6 +41,7 @@ function replaceAll() {
       replaceExceptions(options);
       replaceCuts();
       replaceCapitals();
+      replaceMirror();
     }
   });
 }
@@ -233,12 +234,18 @@ function replaceCuts() {
   walk(document.body, searchTerm, null, cutMethod);
 }
 
-/* Replaces cut statements with cuts */
+/* Replaces capital statements statements with requested casing */
 function replaceCapitals() {
   const searchTerm = /(cap|Cap|CAP)\/([^\/]+)\//i;
   walk(document.body, searchTerm, null, capitalMethod);
 }
 
+/* Replaces mirror statements with reversed phrases */
+function replaceMirror() {
+  const searchTerm = /mrr\/([^\/]+)\//i;
+  walk(document.body, searchTerm, null, mirrorMethod);
+}
+
 /* Turns a term into regexp format and uses that to replace it */
 function escapeAndReplace(searchTerm, replaceValue, caseSensitive) {
   let searchTermEscaped = searchTerm.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
@@ -401,6 +408,18 @@ function capitalMethod(node, searchTerm, unused) {
   capitalMethod(node, searchTerm, unused);
 }
 
+/* Allows for custom words to be mirrored */
+function mirrorMethod(node, searchTerm, unused) {
+  const match = node.nodeValue.match(searchTerm);
+  if (match == null) { return; }
+  const target = match[1];
+
+  let replaceValue = target.split('').reverse().join('');
+
+  node.nodeValue = node.nodeValue.replace(searchTerm, replaceValue);
+  mirrorMethod(node, searchTerm, unused);
+}
+
 /* Returns the input word, capitalized */
 function capitalize(word) {
   return word.charAt(0).toUpperCase() + word.slice(1);