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);
+ }
+ }
+
}