Enclose implementations under a namespace

src/js/background/diff.js

@@ -98,7 +98,7 @@ Diff.prototype = {
         // path whose position in the new string is the farthest from the origin
         // and does not pass the bounds of the diff graph
         if (!canAdd || (canRemove && addPath.newPos < removePath.newPos)) {
-          basePath = clonePath(removePath);
+          basePath = this._clonePath(removePath);
           self.pushComponent(basePath.components, undefined, true);
         } else {
           basePath = addPath; // No need to clone, we've pulled it from the list
@@ -110,7 +110,7 @@ Diff.prototype = {
 
         // If we have hit the end of both strings, then we are done
         if (basePath.newPos + 1 >= newLen && oldPos + 1 >= oldLen) {
-          return done(buildValues(self, basePath.components, newString, oldString, self.useLongestToken));
+          return done(this._buildValues(self, basePath.components, newString, oldString, self.useLongestToken));
         } else {
           // Otherwise track this path as a potential candidate and continue.
           bestPath[diagonalPath] = basePath;
@@ -132,14 +132,14 @@ Diff.prototype = {
             return callback();
           }
 
-          if (!execEditLength()) {
+          if (!execEditLength.call(this)) {
             exec();
           }
         }, 0);
       }());
     } else {
       while (editLength <= maxEditLength) {
-        let ret = execEditLength();
+        let ret = execEditLength.call(this);
         if (ret) {
           return ret;
         }
@@ -197,10 +197,9 @@ Diff.prototype = {
   },
   join(value) {
     return value;
-  }
-};
+  },
 
-function buildValues(diff, components, newString, oldString, useLongestToken) {
+  _buildValues(diff, components, newString, oldString, useLongestToken) {
     let componentPos = 0,
         componentLen = components.length,
         newPos = 0,
@@ -254,8 +253,9 @@ function buildValues(diff, components, newString, oldString, useLongestToken) {
     }
 
     return components;
-}
+  },
 
-function clonePath(path) {
+  _clonePath(path) {
     return { newPos: path.newPos, components: path.components.slice(0) };
   }
+};