support splitter as a function while compare(simple compare)

Author: nighca

lib/compare.js

@@ -4,7 +4,7 @@
  */
 
 var compare = function(cnt1, cnt2, splitter){
-    var SPLITTER = splitter || '',
+    var SPLITTER = typeof splitter === 'string' ? splitter : '',
 
         MARK_EMPTY = -1,
         MARK_SAME = 0,
@@ -27,8 +27,14 @@ var compare = function(cnt1, cnt2, splitter){
     }
 
     // convert string to array
-    var arr1 = cnt1.split(SPLITTER),
+    var arr1, arr2;
+    if(typeof splitter === 'function'){
+        arr1 = splitter(cnt1);
+        arr2 = splitter(cnt2);
+    }else{
+        arr1 = cnt1.split(SPLITTER);
         arr2 = cnt2.split(SPLITTER);
+    }
 
     // caculate min distance & log each step
     var l1 = arr1.length,