X-Git-Url: http://git.megacz.com/?p=sbp.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2FResult.java;h=95baeba55974e7cd9d53baffabd4e3b44fc4e296;hp=cb351ebbebb0cb27fa34e2f021be4f59b7d59cae;hb=2afdfe14e78fa0597186614937c679a09d74ecdf;hpb=33caf3cccd3d404244249113854cdac3f99ec2fb

diff --git a/src/edu/berkeley/sbp/Result.java b/src/edu/berkeley/sbp/Result.java
index cb351eb..95baeba 100644
--- a/src/edu/berkeley/sbp/Result.java
+++ b/src/edu/berkeley/sbp/Result.java
@@ -1,31 +1,61 @@
 // Copyright 2006 all rights reserved; see LICENSE file for BSD-style license
 
 package edu.berkeley.sbp;
-import edu.berkeley.sbp.*;
 import edu.berkeley.sbp.util.*;
-import edu.berkeley.sbp.Parser.Table.*;
 import edu.berkeley.sbp.Sequence.Position;
-import java.io.*;
 import java.util.*;
-import java.lang.reflect.*;
 
-class Result implements GraphViz.ToGraphViz {
+final class Result implements GraphViz.ToGraphViz {
 
     private Forest f;
     private Node parent;
-    private GSS.Phase phase;
-    private Position reduction;
+    private HashSet<Node> children = new HashSet<Node>();
+    private boolean destroyed = false;
+    private int usedByNonDoomedNode = 0;
 
-    public Position reduction() { return reduction; }
-    public GSS.Phase phase() { return phase; }
+    public GSS.Phase phase() { return parent==null ? null : parent.phase(); }
     public Forest getForest() { return f; }
     public Node parent() { return parent; }
+    public void addChild(Node child) {
+        children.add(child);
+        usedByNonDoomedNode += child.state().doomed ? 0 : 1;
+    }
+    public void removeChild(Node child) {
+        if (!children.contains(child)) return;
+        children.remove(child);
+        usedByNonDoomedNode -= child.state().doomed ? 0 : 1;
+        check();
+    }
+
+    public boolean usedByAnyNode() { return children.size() > 0; }
+    public boolean usedByNonDoomedNode() { return usedByNonDoomedNode > 0; }
+
+    public String toString() { return super.toString()+"->"+parent(); }
+
+    public void check() { if (children.size()==0) destroy(); }
+    public void destroy() {
+        if (destroyed) return;
+        if (parent==null) return;  // never destroy the "primordeal" result
+        destroyed = true;
+        parent.removeChild(this);
+        while(children.size() > 0)
+            for(Node n : children) {
+                removeChild(n);
+                n.removeResult(this);
+                break;
+            }
+    }
 
     public Result(Forest f, Node parent, Position reduction) {
+        this(f, parent, reduction, null);
+    }
+    public Result(Forest f, Node parent, Position reduction, GSS.Phase target) {
         this.f = f;
-        this.reduction = reduction;
         this.parent = parent;
-        if (parent != null) phase = parent.phase();
+        if (parent != null) parent.addChild(this);
+        if (reduction == null) return;
+        Parser.Table.State state0 = (Parser.Table.State)parent.state().gotoSetNonTerminals.get(reduction.owner());
+        target.newNodeFromReduction(this, state0, reduction);
     }
 
     // GraphViz //////////////////////////////////////////////////////////////////////////////