/// <summary>
/// Updates positions of all elements and attributes in the tree
/// reflecting change made to the source text buffer.
/// </summary>
/// <param name="start">Start position of the change</param>
/// <param name="oldLength">Length of changed fragment before the change</param>
/// <param name="newLength">Length of changed fragment after the change</param>
public void ReflectTextChanges(IList <TextChangeEventArgs> textChanges)
{
if (textChanges.Count == 1)
{
ReflectTextChange(textChanges[0].Start, textChanges[0].OldLength, textChanges[0].NewLength);
}
else if (textChanges.Count > 1)
{
// See if we can merge the edits into a single ReflectTextChange call
TextChangeEventArgs firstChange = textChanges[0];
TextChangeEventArgs lastChange = textChanges[textChanges.Count - 1];
int start = firstChange.Start;
int oldLength = (lastChange.OldStart - firstChange.OldStart) + lastChange.OldLength;
bool allowMerge = true;
int firstItemAtOrAfter;
if (allowMerge)
{
firstItemAtOrAfter = CommentCollection.GetFirstItemAfterOrAtPosition(start);
if ((firstItemAtOrAfter >= 0) && (CommentCollection[firstItemAtOrAfter].Start <= start + oldLength))
{
allowMerge = false;
}
}
if (allowMerge)
{
ElementNode element = RootNode.ElementFromPosition(start);
if ((element == null) || (element.InnerRange.Start > start) || (element.InnerRange.End < (start + oldLength)))
{
allowMerge = false;
}
else if (element.Children.Count != 0)
{
allowMerge = false;
}
}
if (allowMerge)
{
int newLength = (lastChange.Start - firstChange.Start) + lastChange.NewLength;
ReflectTextChange(start, oldLength, newLength);
}
else
{
foreach (TextChangeEventArgs curChange in textChanges)
{
ReflectTextChange(curChange.Start, curChange.OldLength, curChange.NewLength);
}
}
}
}