X-Git-Url: http://git.megacz.com/?p=sbp.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2Fmeta%2FMetaGrammarBindings.java;h=b70ddb8dc5f462a81d6f548db577abc1a4737c0b;hp=401536f2aca726718d96982cb84f6fd463d4bac2;hb=c4b4207ce1be50359c6bd8abe1d657ff8ae8ad6e;hpb=a7ba8d8a5f0cb7fbb5bf67f1a95f1cad5226c507

diff --git a/src/edu/berkeley/sbp/meta/MetaGrammarBindings.java b/src/edu/berkeley/sbp/meta/MetaGrammarBindings.java
index 401536f..b70ddb8 100644
--- a/src/edu/berkeley/sbp/meta/MetaGrammarBindings.java
+++ b/src/edu/berkeley/sbp/meta/MetaGrammarBindings.java
@@ -15,7 +15,12 @@ public class MetaGrammarBindings {
     /** A grammar (a set of nonterminals) */
     public static class GrammarNode extends HashMap<String,NonTerminalNode> {
         public @bind.as("Grammar") GrammarNode(NonTerminalNode[] nonterminals) {
-            for(NonTerminalNode nt : nonterminals) this.put(nt.name, nt); }
+            for(NonTerminalNode nt : nonterminals) {
+                if (this.get(nt.name)!=null)
+                    throw new RuntimeException("duplicate definition of nonterminal \""+nt.name+"\"");
+                this.put(nt.name, nt);
+            }
+        }
         public String toString() {
             String ret = "[ ";
             for(NonTerminalNode nt : values()) ret += nt + ", ";
@@ -327,7 +332,7 @@ public class MetaGrammarBindings {
     public static @bind.as("~")   ElementNode tilde(final ElementNode e) {
         return new PostProcess(e) {
                 public Element postProcess(Element e) {
-                    return infer((Topology<Character>)Atom.toAtom(e).complement()); 
+                    return infer((Topology<Character>)Atom.toAtom(e).complement().minus(CharRange.braces));
                 } }; }
 
     public static @bind.as("Word")        String word(String s) { return s; }