private void CheckNodeProperties(TextAnchorNode node, TextAnchorNode parentNode, bool parentColor, int blackCount,
ref int expectedBlackCount)
{
if (node == null) return;
Debug.Assert(node.parent == parentNode);
if (parentColor == RED)
{
Debug.Assert(node.color == BLACK);
}
if (node.color == BLACK)
{
blackCount++;
}
if (node.left == null && node.right == null)
{
// node is a leaf node:
if (expectedBlackCount == -1)
expectedBlackCount = blackCount;
else
Debug.Assert(expectedBlackCount == blackCount);
}
CheckNodeProperties(node.left, node, node.color, blackCount, ref expectedBlackCount);
CheckNodeProperties(node.right, node, node.color, blackCount, ref expectedBlackCount);
}
#endif
