protected void AdjustFlagsAndWidth(GreenNode node)
{
Debug.Assert(node != null, "PERF: caller must ensure that node!=null, we do not want to re-check that here.");
this.flags |= (node.flags & NodeFlags.InheritMask);
_fullWidth += node._fullWidth;
}
/// <summary>
/// Used by structured trivia which has "parent == null", and therefore must know its
/// SyntaxTree explicitly when created.
/// </summary>
internal SyntaxNode(GreenNode green, int position, SyntaxTree syntaxTree)
: this(green, null, position)
{
this._syntaxTree = syntaxTree;
}
private static GreenNode GetGreenNodeAt(GreenNode node, int i)
{
Debug.Assert(node.IsList || (i == 0 && !node.IsList));
return(node.IsList ? node.GetSlot(i) : node);
}
public virtual GreenNode WithTrailingTrivia(GreenNode trivia)
{
return(this);
}
internal bool IsCacheEquivalent(int kind, NodeFlags flags, GreenNode child1, GreenNode child2, GreenNode child3)
{
Debug.Assert(this.IsCacheable);
return(this.RawKind == kind &&
this.flags == flags &&
this.GetSlot(0) == child1 &&
this.GetSlot(1) == child2 &&
this.GetSlot(2) == child3);
}
protected void AdjustFlagsAndWidth(GreenNode node)
{
Debug.Assert(node != null, "PERF: caller must ensure that node!=null, we do not want to re-check that here.");
this.flags |= (node.flags & NodeFlags.InheritMask);
_fullWidth += node._fullWidth;
}
internal SyntaxToken(GreenNode token)
: this()
{
Debug.Assert(token == null || token.IsToken, "token must be a token");
Node = token;
}
private static int Occupancy(GreenNode green)
{
return(green.IsList ? green.SlotCount : 1);
}
/// <summary>
/// Locate the node or token that is a child of the given <see cref="SyntaxNode"/> and contains the given position.
/// </summary>
/// <param name="node">The <see cref="SyntaxNode"/> to search.</param>
/// <param name="targetPosition">The position.</param>
/// <returns>The node or token that spans the given position.</returns>
/// <remarks>
/// Assumes that <paramref name="targetPosition"/> is within the span of <paramref name="node"/>.
/// </remarks>
internal static SyntaxNodeOrToken ChildThatContainsPosition(SyntaxNode node, int targetPosition)
{
// The targetPosition must already be within this node
Debug.Assert(node.FullSpan.Contains(targetPosition));
var green = node.Green;
var position = node.Position;
var index = 0;
Debug.Assert(!green.IsList);
// Find the green node that spans the target position.
// We will be skipping whole slots here so we will not loop for long
// The max possible number of slots is 11 (TypeDeclarationSyntax)
// and typically much less than that
int slot;
for (slot = 0; ; slot++)
{
GreenNode greenChild = green.GetSlot(slot);
if (greenChild != null)
{
var endPosition = position + greenChild.FullWidth;
if (targetPosition < endPosition)
{
// Descend into the child element
green = greenChild;
break;
}
position = endPosition;
index += Occupancy(greenChild);
}
}
// Realize the red node (if any)
var red = node.GetNodeSlot(slot);
if (!green.IsList)
{
// This is a single node or token.
// If it is a node, we are done.
if (red != null)
{
return(red);
}
// Otherwise will have to make a token with current green and position
}
else
{
slot = green.FindSlotIndexContainingOffset(targetPosition - position);
// Realize the red node (if any)
if (red != null)
{
// It is a red list of nodes (separated or not)
red = red.GetNodeSlot(slot);
if (red != null)
{
return(red);
}
// Must be a separator
}
// Otherwise we have a token.
position += green.GetSlotOffset(slot);
green = green.GetSlot(slot);
// Since we can't have "lists of lists", the Occupancy calculation for
// child elements in a list is simple.
index += slot;
}
// Make a token with current child and position.
return(new SyntaxNodeOrToken(node, green, position, index));
}
/// <summary>
/// internal indexer that does not verify index.
/// Used when caller has already ensured that index is within bounds.
/// </summary>
internal static SyntaxNodeOrToken ItemInternal(SyntaxNode node, int index)
{
GreenNode greenChild;
GreenNode green = node.Green;
int idx = index;
int slotIndex = 0;
int position = node.Position;
// find a slot that contains the node or its parent list (if node is in a list)
// we will be skipping whole slots here so we will not loop for long
// the max possible number of slots is 11 (TypeDeclarationSyntax)
// and typically much less than that
//
// at the end of this loop we will have
// 1) slot index - slotIdx
// 2) if the slot is a list, node index in the list - idx
// 3) slot position - position
while (true)
{
greenChild = green.GetSlot(slotIndex);
if (greenChild != null)
{
int currentOccupancy = Occupancy(greenChild);
if (idx < currentOccupancy)
{
break;
}
idx -= currentOccupancy;
position += greenChild.FullWidth;
}
slotIndex++;
}
// get node that represents this slot
SyntaxNode red = node.GetNodeSlot(slotIndex);
if (!greenChild.IsList)
{
// this is a single node or token
// if it is a node, we are done
// otherwise will have to make a token with current gChild and position
if (red != null)
{
return(red);
}
}
else if (red != null)
{
// it is a red list of nodes (separated or not), most common case
SyntaxNode redChild = red.GetNodeSlot(idx);
if (redChild != null)
{
// this is our node
return(redChild);
}
// must be a separator
// update gChild and position and let it be handled as a token
greenChild = greenChild.GetSlot(idx);
position = red.GetChildPosition(idx);
}
else
{
// it is a token from a token list, uncommon case
// update gChild and position and let it be handled as a token
position += greenChild.GetSlotOffset(idx);
greenChild = greenChild.GetSlot(idx);
}
return(new SyntaxNodeOrToken(node, greenChild, position, index));
}
