private static Node Insert(Node root, Node newNode, int newNodeStart, IIntervalIntrospector <T> introspector)
{
if (root == null)
{
return(newNode);
}
Node newLeft, newRight;
if (newNodeStart < introspector.GetStart(root.Value))
{
newLeft = Insert(root.Left, newNode, newNodeStart, introspector);
newRight = root.Right;
}
else
{
newLeft = root.Left;
newRight = Insert(root.Right, newNode, newNodeStart, introspector);
}
root.SetLeftRight(newLeft, newRight, introspector);
var newRoot = root;
return(Balance(newRoot, introspector));
}
private static bool IntersectsWith(T value, int start, int length, IIntervalIntrospector <T> introspector)
{
var otherStart = start;
var otherEnd = start + length;
var thisEnd = GetEnd(value, introspector);
var thisStart = introspector.GetStart(value);
return(otherStart <= thisEnd && otherEnd >= thisStart);
}
protected static bool Contains(T value, int start, int length, IIntervalIntrospector <T> introspector)
{
var otherStart = start;
var otherEnd = start + length;
var thisEnd = GetEnd(value, introspector);
var thisStart = introspector.GetStart(value);
// make sure "Contains" test to be same as what TextSpan does
if (length == 0)
{
return(thisStart <= otherStart && otherEnd < thisEnd);
}
return(thisStart <= otherStart && otherEnd <= thisEnd);
}
private static bool IntersectsWith(T value, int start, int length, IIntervalIntrospector <T> introspector, bool skipZeroLengthIntervals)
{
var otherStart = start;
var otherEnd = start + length;
var thisEnd = GetEnd(value, introspector);
var thisStart = introspector.GetStart(value);
if (thisStart == thisEnd &&
skipZeroLengthIntervals)
{
return(false);
}
return(otherStart <= thisEnd && otherEnd >= thisStart);
}
private static bool OverlapsWith(T value, int start, int length, IIntervalIntrospector <T> introspector)
{
var otherStart = start;
var otherEnd = start + length;
var thisEnd = GetEnd(value, introspector);
var thisStart = introspector.GetStart(value);
if (length == 0)
{
return(thisStart < otherStart && otherStart < thisEnd);
}
int overlapStart = Math.Max(thisStart, otherStart);
int overlapEnd = Math.Min(thisEnd, otherEnd);
return(overlapStart < overlapEnd);
}
private IEnumerable <T> GetPreOrderIntervals(int start, int length, TestInterval testInterval, IIntervalIntrospector <T> introspector, bool skipZeroLengthIntervals)
{
if (root == null || GetEnd(root.MaxEndNode.Value, introspector) < start)
{
yield break;
}
int end = start + length;
var candidates = new Stack <Node>();
candidates.Push(root);
while (candidates.Count != 0)
{
var currentNode = candidates.Pop();
// right children's starts will never be to the left of the parent's start
// so we should consider right subtree
// only if root's start overlaps with interval's End,
if (introspector.GetStart(currentNode.Value) <= end)
{
var right = currentNode.Right;
if (right != null && GetEnd(right.MaxEndNode.Value, introspector) >= start)
{
candidates.Push(right);
}
}
// only if left's maxVal overlaps with interval's start,
// we should consider left subtree
var left = currentNode.Left;
if (left != null && GetEnd(left.MaxEndNode.Value, introspector) >= start)
{
candidates.Push(left);
}
if (testInterval(currentNode.Value, start, length, introspector, skipZeroLengthIntervals))
{
yield return(currentNode.Value);
}
}
}
protected static int GetEnd(T value, IIntervalIntrospector <T> introspector)
{
return(introspector.GetStart(value) + introspector.GetLength(value));
}
protected static Node Insert(Node root, Node newNode, IIntervalIntrospector <T> introspector)
{
var newNodeStart = introspector.GetStart(newNode.Value);
return(Insert(root, newNode, newNodeStart, introspector));
}
private IEnumerable <T> GetInOrderIntervals(int start, int length, TestInterval testInterval, IIntervalIntrospector <T> introspector)
{
if (root == null)
{
yield break;
}
var end = start + length;
// The bool indicates if this is the first time we are seeing the node.
var candidates = new Stack <ValueTuple <Node, bool> >();
candidates.Push(ValueTuple.Create(root, true));
while (candidates.Count > 0)
{
var currentTuple = candidates.Pop();
var currentNode = currentTuple.Item1;
Debug.Assert(currentNode != null);
var firstTime = currentTuple.Item2;
if (!firstTime)
{
// We're seeing this node for the second time (as we walk back up the left
// side of it). Now see if it matches our test, and if so return it out.
if (testInterval(currentNode.Value, start, length, introspector))
{
yield return(currentNode.Value);
}
}
else
{
// First time we're seeing this node. In order to see the node 'in-order',
// we push the right side, then the node again, then the left side. This
// time we mark the current node with 'false' to indicate that it's the
// second time we're seeing it the next time it comes around.
// right children's starts will never be to the left of the parent's start
// so we should consider right subtree only if root's start overlaps with
// interval's End,
if (introspector.GetStart(currentNode.Value) <= end)
{
var right = currentNode.Right;
if (right != null && GetEnd(right.MaxEndNode.Value, introspector) >= start)
{
candidates.Push(ValueTuple.Create(right, true));
}
}
candidates.Push(ValueTuple.Create(currentNode, false));
// only if left's maxVal overlaps with interval's start, we should consider
// left subtree
var left = currentNode.Left;
if (left != null && GetEnd(left.MaxEndNode.Value, introspector) >= start)
{
candidates.Push(ValueTuple.Create(left, true));
}
}
}
}
private IList <T> GetInOrderIntervals(int start, int length, TestInterval testInterval, IIntervalIntrospector <T> introspector, bool skipZeroLengthIntervals)
{
List <T> result = null;
if (root != null && GetEnd(root.MaxEndNode.Value, introspector) >= start)
{
int end = start + length;
var candidates = new Stack <Node>();
var currentNode = root;
while (true)
{
if (currentNode != null)
{
candidates.Push(currentNode);
// only if left's maxVal overlaps with interval's start,
// we should consider left subtree
var left = currentNode.Left;
if (left != null && GetEnd(left.MaxEndNode.Value, introspector) >= start)
{
currentNode = left;
continue;
}
// current node has no meaning now, set it to null
currentNode = null;
}
if (candidates.Count == 0)
{
break;
}
currentNode = candidates.Pop();
if (testInterval(currentNode.Value, start, length, introspector, skipZeroLengthIntervals))
{
result = result ?? new List <T>();
result.Add(currentNode.Value);
}
// right children's starts will never be to the left of the parent's start
// so we should consider right subtree
// only if root's start overlaps with interval's End,
if (introspector.GetStart(currentNode.Value) <= end)
{
var right = currentNode.Right;
if (right != null && GetEnd(right.MaxEndNode.Value, introspector) >= start)
{
currentNode = right;
continue;
}
}
// set to null to get new one from stack
currentNode = null;
}
}
return(result ?? SpecializedCollections.EmptyList <T>());
}
