*** empty log message ***

diff --git a/MText.cs b/MText.cs
index 836c4f4..1fbb3f0 100644 (file)
--- a/MText.cs
+++ b/MText.cs
@@ -313,14 +313,27 @@ namespace M17N.Core
        this.depth = 1;
       }
 
-      public MInterval Copy (int start, int end, MInterval interval)
+      private MInterval find (int pos)
       {
-       MInterval new_interval;
+       if (pos < total_start || total_end < pos)
+         return null;
+       if (pos < Start)
+         return left.find (pos);
+       if (End < pos)
+         return right.find (pos);
+       return this;
+      }
+
+      public MInterval Copy (int start, int end)
+      {
+       MInterval interval_start = find (start);
+       MInterval interval_end = find (end);
+       MInterval interval;
 
        start = adjust_position (start, true);
        end  = adjust_position (end, true);
-       new_interval = new MInterval (start, end, interval.stack);
-       return new_interval;
+       interval = new MInterval (start, end, stack);
+       return interval;
       }
 
       private MInterval Copy ()