-// 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.*;
extends PrintableTree<Tree<NodeType>>
implements Iterable<Tree<NodeType>> {
+ private static final Tree[] emptyTree = new Tree[0];
+
private final Input.Region location;
private final NodeType ihead;
private final Tree<NodeType>[] children;
/** get the input region that this tree was parsed from */
public Input.Region getRegion() { return location; }
- public Tree(Input.Region loc, NodeType head) { this(loc, head, null); }
- public Tree(Input.Region loc, NodeType head, Tree<NodeType>[] children) { this(loc, head, children, false); }
+ public Tree(Input.Region loc, NodeType head) {
+ location = loc;
+ ihead = head;
+ children = emptyTree;
+ }
+ public Tree(Input.Region loc, NodeType head, List<Tree<NodeType>> kids){
+ location = loc;
+ ihead = head;
+ if (kids.size() == 0)
+ children = emptyTree;
+ else {
+ children = new Tree[kids.size()];
+ kids.toArray(children);
+ }
+ }
+ public Tree(Input.Region loc, NodeType head, Tree<NodeType>[] kids) {
+ location = loc;
+ ihead = head;
+ children = (kids == null ? emptyTree : kids.clone());
+ }
// FIXME: fairly inefficient because we keep copying arrays
/** package-private constructor, allows setting the "lift" bit */
- Tree(Input.Region loc, NodeType head, Tree<NodeType>[] children, boolean lift) {
+ Tree(Input.Region loc, NodeType head, Tree<NodeType>[] children, boolean[] lifts) {
this.location = loc;
this.ihead = head;
- if (lift && children != null && children.length > 0) {
- Tree<NodeType> last = children[children.length-1];
- this.children = new Tree[(children.length-1)+last.children.length];
- System.arraycopy(children, 0, this.children, 0, children.length-1);
- if (last.children.length > 0)
- System.arraycopy(last.children, 0, this.children, children.length-1, last.children.length);
- } else {
- this.children = ArrayUtil.clone(children, Tree.class);
+
+ int count = 0;
+ for(int i=0; i<children.length; i++)
+ count += lifts[i] ? children[i].size() : 1;
+
+ this.children = new Tree[count];
+ int j = 0;
+ for(int i=0; i<children.length; i++) {
+ if (!lifts[i])
+ this.children[j++] = children[i];
+ else
+ for(int k=0; k<children[i].size(); k++)
+ this.children[j++] = children[i].child(k);
}
}
if (head()==null) return null;
if (head() instanceof ToJava) {
StringBuffer sb = new StringBuffer();
- ((ToJava)head()).toJava(sb);
+ try {
+ ((ToJava)head()).toJava(sb);
+ } catch (IOException e) { throw new RuntimeException(e); }
return sb.toString();
}
return (head()==null?"null":("\""+StringUtil.toJavaString(head().toString())+"\""));