protected void SimplifyLevel(SymTokenBalancerMarkerLevelNode aLevel)
{
System.Diagnostics.Debug.Assert(aLevel.IsRoot == false && aLevel.HasParent);
SymNode parent = aLevel.Parent;
int levelNumber = parent.Depth;
//
int childCount = parent.ChildCount;
while (--childCount >= 0)
{
SymNode possibleLevelNode = parent[childCount];
// We're looking to remove redundant bracketing from either side of the level
// node. First check if we have a level node...
if (possibleLevelNode is SymTokenBalancerMarkerLevelNode)
{
// Then check whether it has a previous and a next node. These should
// be the SymTokenBalancerNodeEmittedElement nodes
if (possibleLevelNode.HasPrevious && possibleLevelNode.HasNext)
{
if (possibleLevelNode.Previous is SymTokenBalancerNodeEmittedElement && possibleLevelNode.Next is SymTokenBalancerNodeEmittedElement)
{
if (LevelCanBeMergedWithParent(possibleLevelNode as SymTokenBalancerMarkerLevelNode))
{
SymTokenBalancerNodeEmittedElement previous = (SymTokenBalancerNodeEmittedElement)possibleLevelNode.Previous;
SymTokenBalancerNodeEmittedElement next = (SymTokenBalancerNodeEmittedElement)possibleLevelNode.Next;
// Insert value node prior to previous node (which is the opening bracket token).
parent.InsertChildrenFrom(possibleLevelNode, previous.Previous);
// Remove the opening bracket token
previous.Remove();
// Remove the level marker token
possibleLevelNode.Remove();
// Remove the closing bracket token.
next.Remove();
}
}
}
}
}
}
public void Subsume()
{
System.Diagnostics.Debug.Assert(IsComplete);
//
SymTokenBalancerNodeEmittedElement previous = EmittedElementPrevious;
SymTokenBalancerNodeEmittedElement next = EmittedElementNext;
// Insert all my children as siblings of myself (i.e. make my parent's
// grandchildren its direct children - i.e. promote them up the tree
// by one level).
SymNode parent = Parent;
ArrayList parentsChildren = Parent.Children;
parent.InsertChildrenFrom(this /* my children */, previous.Previous /* move them before the opening bracket */);
// Remove the opening bracket token
previous.Remove();
// Remove the closing bracket token.
next.Remove();
// Remove the level marker token, i.e myself
Remove();
}