/// <summary>
/// Incrementally applies whitespace change to the buffer
/// having old and new tokens produced from the 'before formatting'
/// and 'after formatting' versions of the same text.
/// </summary>
/// <param name="editorBuffer">Text buffer to apply changes to</param>
/// <param name="oldTextProvider">Text provider of the text fragment before formatting</param>
/// <param name="newTextProvider">Text provider of the formatted text</param>
/// <param name="oldTokens">Tokens from the 'before' text fragment</param>
/// <param name="newTokens">Tokens from the 'after' text fragment</param>
/// <param name="formatRange">Range that is being formatted in the text buffer</param>
/// <param name="transactionName">Not used in VS Code</param>
/// <param name="selectionTracker">Not used in VS Code</param>
/// <param name="additionalAction">
/// Action to perform after changes are applies by undo unit is not yet closed.
/// </param>
public void ApplyChange(
IEditorBuffer editorBuffer,
ITextProvider oldTextProvider,
ITextProvider newTextProvider,
IReadOnlyList <ITextRange> oldTokens,
IReadOnlyList <ITextRange> newTokens,
ITextRange formatRange,
string transactionName,
ISelectionTracker selectionTracker,
Action additionalAction = null)
{
Debug.Assert(oldTokens.Count == newTokens.Count);
if (oldTokens.Count != newTokens.Count)
{
return;
}
var edits = CalculateChanges(oldTextProvider, newTextProvider, oldTokens, newTokens, formatRange);
foreach (var e in edits)
{
if (string.IsNullOrEmpty(e.NewText))
{
editorBuffer.Delete(e.Range);
}
else if (e.Range.Length > 0)
{
editorBuffer.Replace(e.Range, e.NewText);
}
else
{
editorBuffer.Insert(e.Range.Start, e.NewText);
}
}
additionalAction?.Invoke();
}