X-Git-Url: http://git.megacz.com/?p=sbp.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2Ftib%2FTib.java;h=9b4b97489a37d1577e9be97867398ee9ef13bb82;hp=7f9b913bac6990ce06c983deb8ee394b38833a1f;hb=87f214f3da9f43c3ab93923313845c372f9a96be;hpb=2f167f63aff4b6da4d82669faf2c7ada4c93be4b

diff --git a/src/edu/berkeley/sbp/tib/Tib.java b/src/edu/berkeley/sbp/tib/Tib.java
index 7f9b913..9b4b974 100644
--- a/src/edu/berkeley/sbp/tib/Tib.java
+++ b/src/edu/berkeley/sbp/tib/Tib.java
@@ -285,5 +285,39 @@ public class Tib implements Token.Stream<CharToken> {
         return ret.toString();
     }
 
+    // Grammar //////////////////////////////////////////////////////////////////////////////
+
+    public static class Grammar extends MetaGrammar {
+        private int anon = 0;
+        private final Element ws = Repeat.maximal(Repeat.many0(nonTerminal("w")));
+        public Grammar() {
+            dropAll.add(ws);
+        }
+        public Object walk(Tree<String> tree) {
+            String head = tree.head();
+            if (tree.numChildren()==0) return super.walk(tree);
+            if ("{".equals(head)) {
+                String s = "braced"+(anon++);
+                Union u = nonTerminal(s);
+                Union u2 = ((PreSequence)walk(tree, 0)).sparse(ws).buildUnion();
+                u2.add(Sequence.singleton(new Element[] { u }, 0, null, null));
+                return nonTerminal(s,
+                                   new PreSequence[][] {
+                                       new PreSequence[] {
+                                           new PreSequence(new Element[] { CharToken.leftBrace,
+                                                                           ws,
+                                                                           u2,
+                                                                           ws,
+                                                                           CharToken.rightBrace
+                                           })
+                                       }
+                                   },
+                                   false,
+                                   false);
+            }
+            return super.walk(tree);
+        }
+    }
+
 }