X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2FElement.java;h=b4402574b9220781633d35a0dd0e66d1c97bf195;hb=0516ea34996c86664928ef948013b749876b87ec;hp=b199a23ca52f943964a5afb2a9002e94f42a54d4;hpb=0a0227b9180534d2a431f3d6e08a398bde2244c4;p=sbp.git

diff --git a/src/edu/berkeley/sbp/Element.java b/src/edu/berkeley/sbp/Element.java
index b199a23..b440257 100644
--- a/src/edu/berkeley/sbp/Element.java
+++ b/src/edu/berkeley/sbp/Element.java
@@ -13,6 +13,8 @@ public abstract class Element {
     /** add all positions reachable from the start of this Element to @rp */
     abstract void reachable(HashSet<Sequence.Position> rp);
 
+    abstract Topology toAtom();
+    public Topology noFollow() { return null; }
     Forest epsilonForm() { throw new Error("no epsilon form: " + this); }
     final boolean possiblyEpsilon(Walk.Cache cache)   {
         Boolean ret = cache==null ? null : cache.possiblyEpsilon.get(this);