/**
* Compare two subtrees to see if they match (taking into account the renameableNames
* and the restrictedNames).
*/
public bool matches(SafraTreeNode this_node, SafraTreeNode other_node)
{
Debug.Assert(this_node != null && other_node != null);
if (this_node == null || other_node == null)
{
return(false);
}
if (!renameableNames().get(this_node.getID()))
{
// this is not a new node, so we require a perfect match..
if (other_node.getID() != this_node.getID())
{
return(false);
}
}
else
{
// we are flexible with the id, as long as the id wasn't removed
// in the tree
if (restrictedNames().get(other_node.getID()))
{
return(false);
}
}
Debug.Assert(this_node.getLabeling() == other_node.getLabeling());
Debug.Assert(this_node.hasFinalFlag() == other_node.hasFinalFlag());
// this node looks good, now the children
SafraTreeNode this_child = this_node.getOldestChild();
SafraTreeNode other_child = other_node.getOldestChild();
while (this_child != null && other_child != null)
{
if (!matches(this_child, other_child))
{
return(false);
}
this_child = this_child.getYoungerBrother();
other_child = other_child.getYoungerBrother();
}
Debug.Assert(this_child == null && other_child == null);
return(true);
}
/** */
public void visit(SafraTree tree, SafraTreeNode node)
{
if (_final_states.intersects(node.getLabeling()))//////////if this node has the state in accepting states of NBA
{
BitSet q_and_f = new BitSet(_final_states);
q_and_f.Intersect(node.getLabeling());////////////////get the intersect of the label and the accepting states
SafraTreeNode new_child = tree.newNode();
node.addAsYoungestChild(new_child);
_tree_template.setRenameable(new_child.getID());
new_child.getLabeling().Assign(q_and_f);
}
}
/** Node visitor */
public void visit(SafraTree tree, SafraTreeNode node)
{
int id = node.getID();
if (_tree_template.isRenameable(id))
{
// this node was created recently, so we only delete it from
// the renameableNames, but don't mark it in restrictedNames
_tree_template.setRenameable(id, false);
}
else
{
_tree_template.setRestricted(id);
}
tree.remove(node);
}
/**
* Copy the subtree (the children) of *other
* to *top, becoming the children of *top
*/
public void copySubTree(SafraTreeNode top, SafraTreeNode other)
{
if (other == null)
{
return;
}
//for (SafraTreeNode::child_iterator it=other->children_begin();it!=other->children_end();++it) {
// SafraTreeNode *n=_nodes[(*it)->getID()], *n_o=*it;
// top->addAsYoungestChild(n);
// copySubTree(n, n_o);
//}
SafraTreeNode it = other.children_begin();
while (it != other.children_end())
{
SafraTreeNode n = _nodes[it.getID()];
top.addAsYoungestChild(n);
copySubTree(n, it);
it = it.increment();
}
}
/**
* Remove a SafraTreeNode from the tree,
* the node can have no children.
*/
public void remove(SafraTreeNode node)
{
Debug.Assert(_nodes[node.getID()] == node);
remove(node.getID());
}
/** Node visitor */
public void visit(SafraTree tree, SafraTreeNode node)
{
int id = node.getID();
if (_tree_template.isRenameable(id))
{
// this node was created recently, so we only delete it from
// the renameableNames, but don't mark it in restrictedNames
_tree_template.setRenameable(id, false);
}
else
{
_tree_template.setRestricted(id);
}
tree.remove(node);
}
/**
* Remove a SafraTreeNode from the tree,
* the node can have no children.
*/
public void remove(SafraTreeNode node)
{
Debug.Assert(_nodes[node.getID()] == node);
remove(node.getID());
}
/** Node visitor */
public void visit(SafraTree tree, SafraTreeNode node)
{
if (node.getChildCount() <= 1)
{
return;
}
int i = 0;
//for (SafraTreeNode::child_iterator it= node->children_begin(); it!=node->children_end();++it)
SafraTreeNode it = node.children_begin();
while (it != node.children_end())
{
BitSet reachable_this = _node_reachability[it.getID()];
reachable_this.clear();
_node_order[it.getID()] = i++;
BitSet label_this = it.getLabeling();
//for (BitSetIterator label_it(label_this); label_it != BitSetIterator::end(label_this); ++label_it)
for (int label_it = 0; label_it < label_this.Count; label_it++)
{
reachable_this.Union(_nba_reachability[label_it]);
}
// std::cerr << "reachability_this: "<<reachable_this << std::endl;
it = it.increment();
}
// reorder...
// std::cerr << "Sorting!" << std::endl;
// Bubble sort, ough!
bool finished = false;
while (!finished)
{
finished = true;
for (SafraTreeNode a = node.getOldestChild(); a != null && a.getYoungerBrother() != null; a = a.getYoungerBrother())
{
SafraTreeNode b = a.getYoungerBrother();
BitSet reach_a = _node_reachability[a.getID()];
BitSet reach_b = _node_reachability[b.getID()];
if (reach_a.intersects(reach_b))
{
// a and b are not independant...
// --> keep relative order...
System.Diagnostics.Debug.Assert(_node_order[a.getID()] < _node_order[b.getID()]);
}
else
{
// a and b are independant...
if (!(a.getLabeling() < b.getLabeling()))
{
// swap
node.swapChildren(a, b);
a = b;
finished = false;
}
}
}
}
}
