X-Git-Url: http://git.megacz.com/?p=sbp.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2FUnion.java;h=b690450eb60823bcbf1ceb8c996d070bf001458c;hp=db0db7dca1a322625895ee88f6d338a7934623ba;hb=c366dacc334fe2e35835164f5a37d3eebb2ca6d5;hpb=0516ea34996c86664928ef948013b749876b87ec

diff --git a/src/edu/berkeley/sbp/Union.java b/src/edu/berkeley/sbp/Union.java
index db0db7d..b690450 100644
--- a/src/edu/berkeley/sbp/Union.java
+++ b/src/edu/berkeley/sbp/Union.java
@@ -15,23 +15,28 @@ public class Union extends Element implements Iterable<Sequence> {
     private final List<Sequence> alternatives = new ArrayList<Sequence>();
 
     public Iterator<Sequence> iterator() { return alternatives.iterator(); }
-
-    void reachable(HashSet<Sequence.Position> h) { for(Sequence s : alternatives) s.reachable(h); }
+    public boolean contains(Sequence s) { return alternatives.contains(s); }
 
     Topology toAtom() {
         if (alternatives.size()==0) throw new RuntimeException("cannot build an Atom from a Union with no productions");
         Topology ret = null;
         for(Sequence s : this) {
             Topology a = s.toAtom();
-            if (ret==null) ret = a.dup();
-            else           ret = ret.union(a.dup());
+            if (ret==null) ret = a;
+            else           ret = ret.union(a);
         }
         if (ret==null) throw new RuntimeException("confusion on " + this);
         return ret;
     }
 
     /** adds an alternative */
-    public void add(Sequence s) { alternatives.add(s); }
+    public void add(Sequence s) {
+        alternatives.add(s);
+        if (/*!synthetic &&*/ shortForm!=null
+            //&& Character.isUpperCase(shortForm.charAt(0))
+            )
+            s.setName(toString());
+    }
 
     /**
      *  Since every cycle in a non-degenerate grammar contains at