add KeysByParent function for recursively getting object keys

otto.go

@@ -655,6 +655,25 @@ func (self Object) Keys() []string {
 	return keys
 }
 
+// Get the keys (and those of the parents) for the object, in order of
+// "closest" to "furthest"
+func (self Object) KeysByParent() [][]string {
+	var a [][]string
+
+	for o := self.object; o != nil; o = o.prototype {
+		var l []string
+
+		o.enumerate(false, func(name string) bool {
+			l = append(l, name)
+			return true
+		})
+
+		a = append(a, l)
+	}
+
+	return a
+}
+
 // Class will return the class string of the object.
 //
 // The return value will (generally) be one of: