break Node out of GSS

[sbp.git] / src / edu / berkeley / sbp / meta / MetaGrammarBindings.java

diff --git a/src/edu/berkeley/sbp/meta/MetaGrammarBindings.java b/src/edu/berkeley/sbp/meta/MetaGrammarBindings.java
index b0b86da..1a60610 100644 (file)
--- a/src/edu/berkeley/sbp/meta/MetaGrammarBindings.java
+++ b/src/edu/berkeley/sbp/meta/MetaGrammarBindings.java
@@ -225,9 +225,9 @@ public class MetaGrammarBindings extends AnnotationGrammarBindings {
         }
         public Sequence build(Context cx, Union u, NonTerminalNode cnt) {
             Sequence ret = build0(cx, cnt);
-            for(Seq s : and) { Sequence dork = s.build(cx, u, cnt); ret = ret.and(dork); }
-            for(Seq s : not) { Sequence dork = s.build(cx, u, cnt); ret = ret.andnot(dork); }
-            u.add(ret);
+            for(Seq s : and) { Sequence dork = s.build(cx, null, cnt); ret = ret.and(dork); }
+            for(Seq s : not) { Sequence dork = s.build(cx, null, cnt); ret = ret.andnot(dork); }
+            if (u!=null) u.add(ret);
             return ret;
         }
         public Sequence build0(Context cx, NonTerminalNode cnt) {