checkpoint

[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 2866107..da0204a 100644 (file)
--- a/src/edu/berkeley/sbp/meta/MetaGrammarBindings.java
+++ b/src/edu/berkeley/sbp/meta/MetaGrammarBindings.java
@@ -49,15 +49,21 @@ public class MetaGrammarBindings {
     public static class NonTerminal extends Un {
         public boolean rep;
         public String  name = null;
+        public String sep = null;
         public @bind NonTerminal(@bind.arg String name, @bind.arg Seq[][] sequences) { this(name, sequences, false); }
-        public NonTerminal(String name, Seq[][] sequences, boolean rep) {
+        public NonTerminal(String name, Seq[][] sequences, boolean rep) { this(name, sequences, rep, null); }
+        public NonTerminal(String name, Seq[][] sequences, boolean rep, String sep) {
             this.name = name;
             this.sequences = sequences;
             this.rep = rep;
+            this.sep = sep;
         }
         public Element build(MetaGrammar.Context cx) { return cx.get(name); }
     }
     public static @bind.as("=") NonTerminal go(@bind.arg String name, @bind.arg Seq[][] sequences) { return new NonTerminal(name, sequences, true); }
+    public static @bind.as("=") NonTerminal go(@bind.arg String name, @bind.arg String sep, @bind.arg Seq[][] sequences) {
+        return new NonTerminal(name, sequences, true, sep);
+    }
 
     public static class AnonUn extends Un {
         public @bind.as("(") AnonUn(Seq[][] sequences) {
@@ -212,7 +218,17 @@ public class MetaGrammarBindings {
     public static @bind.as("{")           class XTree                 extends El {
         public @bind.arg Seq body;
         public Element build(MetaGrammar.Context cx) {
-            throw new Error();
+            Union u = new Union();
+            Sequence s = body.build(cx, u, false);
+            Union u2 = new Union();
+            u2.add(Sequence.singleton(new Element[] {
+                CharRange.leftBrace,
+                cx.get("ws"),
+                u,
+                cx.get("ws"),
+                CharRange.rightBrace
+            }, 2));
+            return u2;
         }
     }