/// <summary>
/// Creates a new list with the specified nodes inserted at the index.
/// </summary>
/// <param name="index">The index to insert at.</param>
/// <param name="nodes">The nodes to insert.</param>
public SeparatedSyntaxList <TNode> InsertRange(int index, IEnumerable <TNode> nodes)
{
if (nodes == null)
{
throw new ArgumentNullException(nameof(nodes));
}
if (index < 0 || index > this.Count)
{
throw new ArgumentOutOfRangeException(nameof(index));
}
SyntaxNodeOrTokenList nodesWithSeps = this.GetWithSeparators();
int insertionIndex = index < this.Count ? nodesWithSeps.IndexOf(this[index]) : nodesWithSeps.Count;
// determine how to deal with separators (commas)
if (insertionIndex > 0 && insertionIndex < nodesWithSeps.Count)
{
SyntaxNodeOrToken previous = nodesWithSeps[insertionIndex - 1];
if (previous.IsToken && !KeepSeparatorWithPreviousNode(previous.AsToken()))
{
// pull back so item in inserted before separator
insertionIndex--;
}
}
List <SyntaxNodeOrToken> nodesToInsertWithSeparators = new List <SyntaxNodeOrToken>();
foreach (TNode item in nodes)
{
if (item != null)
{
// if item before insertion point is a node, add a separator
if (nodesToInsertWithSeparators.Count > 0 || (insertionIndex > 0 && nodesWithSeps[insertionIndex - 1].IsNode))
{
nodesToInsertWithSeparators.Add(item.Green.CreateSeparator <TNode>(item));
}
nodesToInsertWithSeparators.Add(item);
}
}
// if item after last inserted node is a node, add separator
if (insertionIndex < nodesWithSeps.Count && nodesWithSeps[insertionIndex].IsNode)
{
SyntaxNode node = nodesWithSeps[insertionIndex].AsNode();
nodesToInsertWithSeparators.Add(node.Green.CreateSeparator <TNode>(node)); // separator
}
return(new SeparatedSyntaxList <TNode>(nodesWithSeps.InsertRange(insertionIndex, nodesToInsertWithSeparators)));
}
internal SeparatedSyntaxList(SyntaxNodeOrTokenList list) : this()
{
Validate(list);
// calculating counts is very cheap when list interleaves nodes and tokens
// so lets just do it here.
int allCount = list.Count;
_count = (allCount + 1) >> 1;
_separatorCount = allCount >> 1;
_list = list;
}
private static void Validate(SyntaxNodeOrTokenList list)
{
for (int i = 0; i < list.Count; i++)
{
var item = list[i];
if ((i & 1) == 0)
{
Debug.Assert(item.IsNode, "Node missing in separated list.");
}
else
{
Debug.Assert(item.IsToken, "Separator token missing in separated list.");
}
}
}
/// <summary>
/// Creates a new list with the specified separator token replaced with the new separator.
/// </summary>
/// <param name="separatorToken">The separator token to be replaced.</param>
/// <param name="newSeparator">The new separator token.</param>
public SeparatedSyntaxList <TNode> ReplaceSeparator(SyntaxToken separatorToken, SyntaxToken newSeparator)
{
SyntaxNodeOrTokenList nodesWithSeps = this.GetWithSeparators();
int index = nodesWithSeps.IndexOf(separatorToken);
if (index < 0)
{
throw new ArgumentException("separatorToken");
}
if (newSeparator.RawKind != nodesWithSeps[index].RawKind ||
newSeparator.Language != nodesWithSeps[index].Language)
{
throw new ArgumentException("newSeparator");
}
return(new SeparatedSyntaxList <TNode>(nodesWithSeps.Replace(separatorToken, newSeparator)));
}
/// <summary>
/// Creates a new list with specified element removed.
/// </summary>
/// <param name="node">The element to remove.</param>
public SeparatedSyntaxList <TNode> Remove(TNode node)
{
SyntaxNodeOrTokenList nodesWithSeps = this.GetWithSeparators();
int index = nodesWithSeps.IndexOf(node);
if (index >= 0 && index <= nodesWithSeps.Count)
{
nodesWithSeps = nodesWithSeps.RemoveAt(index);
// remove separator too
if (index < nodesWithSeps.Count && nodesWithSeps[index].IsToken)
{
nodesWithSeps = nodesWithSeps.RemoveAt(index);
}
else if (index > 0 && nodesWithSeps[index - 1].IsToken)
{
nodesWithSeps = nodesWithSeps.RemoveAt(index - 1);
}
return(new SeparatedSyntaxList <TNode>(nodesWithSeps));
}
return(this);
}
internal Enumerator(SyntaxNodeOrTokenList list)
: this()
{
_list = list;
_index = -1;
}