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JSCover is a tool that measures code coverage for JavaScript programs.

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package jscover.instrument;

import com.google.javascript.rhino.Node;


public class NodeWalker {
//    public void visit(Node n, NodeVisitor callback) {
//        List children = new ArrayList<>();
//        callback.visit(n);
//        for (int i = 0; i < n.getChildCount(); i++) {
//            children.add(n.getChildAtIndex(i));
//        }
//        for (Node child : children) {
//            visit(child, callback);
//        }
//    }

    public void visit(Node n, NodeVisitor callback) {
          callback.visit(n);
        for (Node cursor = n.getFirstChild(); cursor != null; cursor = cursor.getNext()) {
            visit(cursor, callback);
        }
    }

    public void visitAndExitOnAstChange(Node n, NodeVisitor callback) {
        if (callback.visit(n))
            return;
        for (Node cursor = n.getFirstChild(); cursor != null; cursor = cursor.getNext())
            visitAndExitOnAstChange(cursor, callback);
    }
}