-// Copyright 2006 all rights reserved; see LICENSE file for BSD-style license
+// Copyright 2006-2007 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 edu.berkeley.sbp.Sequence.Pos;
+import edu.berkeley.sbp.Sequence.Pos;
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 Node pred;
+ private HashSet<Node> successors = 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 pred==null ? null : pred.phase(); }
public Forest getForest() { return f; }
- public Node parent() { return parent; }
+ public Node pred() { return pred; }
+ public void addSucc(Node succ) {
+ successors.add(succ);
+ usedByNonDoomedNode += succ.state().doomed ? 0 : 1;
+ }
+ public void removeSucc(Node succ) {
+ if (!successors.contains(succ)) return;
+ successors.remove(succ);
+ usedByNonDoomedNode -= succ.state().doomed ? 0 : 1;
+ check();
+ }
+
+ public boolean usedByAnyNode() { return successors.size() > 0; }
+ public boolean usedByNonDoomedNode() { return usedByNonDoomedNode > 0; }
+
+ public String toString() { return super.toString()+"->"+pred(); }
- public Result(Forest f, Node parent, Position reduction) {
+ public void check() { if (successors.size()==0) destroy(); }
+ public void destroy() {
+ if (destroyed) return;
+ if (pred==null) return; // never destroy the "primordeal" result
+ destroyed = true;
+ pred.removeSucc(this);
+ while(successors.size() > 0)
+ for(Node n : successors) {
+ removeSucc(n);
+ n.removeResult(this);
+ break;
+ }
+ }
+
+ public Result(Forest f, Node pred, Pos reduction) {
+ this(f, pred, reduction, null);
+ }
+ public Result(Forest f, Node pred, Pos reduction, GSS.Phase target) {
this.f = f;
- this.reduction = reduction;
- this.parent = parent;
- if (parent != null) phase = parent.phase();
+ this.pred = pred;
+ if (pred != null) pred.addSucc(this);
+ if (reduction == null) return;
+ Parser.Table.State state0 = (Parser.Table.State)pred.state().gotoSetNonTerminals.get(reduction);
+ target.newNodeFromReduction(this, state0, reduction);
}
// GraphViz //////////////////////////////////////////////////////////////////////////////
GraphViz.Node n = gv.createNode(this);
n.label = ""+f;
n.shape = "rectangle";
- if (parent()!=null) n.edge(parent, "");
+ if (pred()!=null) n.edge(pred, "");
n.color = "blue";
if (phase() != null)
((GraphViz.Group)phase().toGraphViz(gv)).add(n);