X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2Fmisc%2FReflectiveWalker.java;h=186fa3bee32694c73e384a081de68622e98da253;hb=cbf78b1b452c393c8c76c91fa6515c64525b56d8;hp=c22e81c87142d2265ad8a62a07a54084dc0aec10;hpb=2724e3d1df836f6ce40bc4227f1509e777de2e48;p=sbp.git

diff --git a/src/edu/berkeley/sbp/misc/ReflectiveWalker.java b/src/edu/berkeley/sbp/misc/ReflectiveWalker.java
index c22e81c..186fa3b 100644
--- a/src/edu/berkeley/sbp/misc/ReflectiveWalker.java
+++ b/src/edu/berkeley/sbp/misc/ReflectiveWalker.java
@@ -5,6 +5,7 @@ import java.io.*;
 import java.util.*;
 import java.lang.reflect.*;
 
+/** use of this class is not recommended; it can handle only S-attributed grammars */
 public class ReflectiveWalker extends StringWalker {
     public ReflectiveWalker()              { this.target = this; }
     public ReflectiveWalker(Object target) { this.target = target; }
@@ -66,12 +67,18 @@ public class ReflectiveWalker extends StringWalker {
         return super.walk(tree);
     }
     */
+    public void walk(String tag) {
+        if (tag==null) return;
+        Member m = member(normalize(tag), 0, false);
+        if (m!=null) Reflection.fuzzyInvoke(target, m);
+    }
+    protected Object defaultWalk(String tag, Object[] argo) { return super.walk(tag, argo); }
     public Object walk(String tag, Object[] argo) {
         if (argo.length==0) return super.walk(tag, argo);
         if (argo==null) return tag;
         if (tag==null || "".equals(tag)) return argo;
-        Member m = member(normalize(tag), argo.length, argo.length>0);
-        if (m==null) return super.walk(tag, argo);
+        Member m = tag==null ? null : member(normalize(tag), argo.length, false);
+        if (m==null) return defaultWalk(tag, argo);
         //System.out.println("preparing to invoke method " + (m==null ? "null" : (m.toString())) + " for sequence " + (owner()+"."+tag));
         if (m != null) return Reflection.fuzzyInvoke(target, m, argo);
         if (argo.length==0) return null;