checkpoint

[sbp.git] / src / edu / berkeley / sbp / misc / MetaGrammar.java

diff --git a/src/edu/berkeley/sbp/misc/MetaGrammar.java b/src/edu/berkeley/sbp/misc/MetaGrammar.java
index 5eeb4a5..d631e8a 100644 (file)
--- a/src/edu/berkeley/sbp/misc/MetaGrammar.java
+++ b/src/edu/berkeley/sbp/misc/MetaGrammar.java
@@ -51,15 +51,6 @@ public class MetaGrammar extends ReflectiveWalker {
 
     // MetaGrammar //////////////////////////////////////////////////////////////////////////////
 
-    public PreSequence _amp_(PreSequence p, Object[] o)        { return p.and(new PreSequence(o, null).buildSequence(null, true, false)); }
-    public PreSequence _amp__tilde_(PreSequence p, Object[] o) { return p.not(new PreSequence(o, null).buildSequence(null, true, false)); }
-    public Element     epsilon(Object o, Object b)                                    { return Union.epsilon; }
-    public Object      _leftparen__rightparen_(Object o)                              { return Union.epsilon; }
-    public Element     _rightparen_(Object e)                                         { return SELF; }
-    public Union       nonTerminal(String s)                                          { return nonTerminal(s, null, false, false); }
-    public Union       _colon__colon__equals_(String s, PreSequence[][] p)            { return nonTerminal(s, p, false, false); }
-    public Union       _bang__colon__colon__equals_(String s, PreSequence[][] p)      { return nonTerminal(s, p, false, true); }
-    public Object      _leftparen_(PreSequence[][] p)                                 { return nonTerminal("anon"+(anon++), p, false, false); }
     public Union       nonTerminal(String str, PreSequence[][] s, boolean synthetic, boolean dropAll) {
         Union n = str.equals(startSymbol) ? g : nt.get(str);
         if (n == null) nt.put(str, n = new Union(str, synthetic));
@@ -111,6 +102,13 @@ public class MetaGrammar extends ReflectiveWalker {
     }
     public PreSequence _slash_(PreSequence p, Object sep) { return p.sparse(sep); }
 
+    public String string(Tree<String> tree) {
+        String ret = "";
+        if (tree.head()!=null) ret += tree.head();
+        for(Tree<String> t : tree.children()) ret += string(t);
+        return ret;
+    }
+
     public Object walk(Tree<String> tree) {
         String head = tree.head();
         if (tree.numChildren()==0) return super.walk(tree);
@@ -124,6 +122,15 @@ public class MetaGrammar extends ReflectiveWalker {
         else if ("**".equals(head)) return Repeat.maximal(Repeat.many0((Element)walk(tree.child(0))));
         else if ("++".equals(head)) return Repeat.maximal(Repeat.many1((Element)walk(tree.child(0))));
         else if ("?".equals(head))  return Repeat.maybe((Element)walk(tree.child(0)));
+        else if ("&".equals(head)) return ((PreSequence)walk(tree,0)).and(new PreSequence((Element[])Reflection.lub((Object[])walk(tree, 1)), null).buildSequence(null, true, false));
+        else if ("&~".equals(head)) return ((PreSequence)walk(tree,0)).not(new PreSequence((Element[])Reflection.lub((Object[])walk(tree, 1)), null).buildSequence(null, true, false));
+        else if ("epsilon".equals(head)) return Union.epsilon;
+        else if ("()".equals(head)) return Union.epsilon;
+        else if (")".equals(head)) return SELF;
+        else if ("nonTerminal".equals(head)) return nonTerminal(string(tree.child(0)), null, false, false);
+        else if ("::=".equals(head)) return nonTerminal(string(tree.child(0)), (PreSequence[][])walk(tree, 1), false, false);
+        else if ("!::=".equals(head)) return nonTerminal(string(tree.child(0)), (PreSequence[][])walk(tree, 1), false, true);
+        else if ("(".equals(head)) return nonTerminal("anon"+(anon++), (PreSequence[][])walk(tree, 0), false, false);
         else return super.walk(tree);
     }