public void PreBackspace(out bool handledCommand)
{
handledCommand = false;
var caretPos = this.GetCaretPosition();
var snapshot = SubjectBuffer.CurrentSnapshot;
if (caretPos.HasValue && caretPos.Value.Position > 0 && (caretPos.Value.Position - 1) == OpeningPoint.GetPoint(snapshot).Position &&
!HasForwardTyping)
{
using var undo = CreateUndoTransaction();
using var edit = SubjectBuffer.CreateEdit();
var span = new SnapshotSpan(OpeningPoint.GetPoint(snapshot), ClosingPoint.GetPoint(snapshot));
edit.Delete(span);
if (edit.HasFailedChanges)
{
edit.Cancel();
undo.Cancel();
Debug.Fail("Unable to clear braces");
}
else
{
// handle the command so the backspace does
// not go through since we've already cleared the braces
handledCommand = true;
edit.ApplyAndLogExceptions();
undo.Complete();
EndSession();
}
}
}
private void ApplyBraceCompletionResult(BraceCompletionResult result)
{
_threadingContext.ThrowIfNotOnUIThread();
using var edit = SubjectBuffer.CreateEdit();
foreach (var change in result.TextChanges)
{
edit.Replace(change.Span.ToSpan(), change.NewText);
}
edit.ApplyAndLogExceptions();
try
{
Contract.ThrowIfFalse(SubjectBuffer.CurrentSnapshot[OpeningPoint.GetPosition(SubjectBuffer.CurrentSnapshot)] == OpeningBrace,
"The opening point does not match the opening brace character");
Contract.ThrowIfFalse(SubjectBuffer.CurrentSnapshot[ClosingPoint.GetPosition(SubjectBuffer.CurrentSnapshot) - 1] == ClosingBrace,
"The closing point does not match the closing brace character");
}
catch (Exception e) when(FatalError.ReportAndCatch(e))
{
return;
}
var caretLine = SubjectBuffer.CurrentSnapshot.GetLineFromLineNumber(result.CaretLocation.Line);
TextView.TryMoveCaretToAndEnsureVisible(new VirtualSnapshotPoint(caretLine, result.CaretLocation.Character));
}
private BraceCompletionContext GetBraceCompletionContext(ParsedDocument document)
{
_threadingContext.ThrowIfNotOnUIThread();
var snapshot = SubjectBuffer.CurrentSnapshot;
var closingSnapshotPoint = ClosingPoint.GetPosition(snapshot);
var openingSnapshotPoint = OpeningPoint.GetPosition(snapshot);
// The user is actively typing so the caret position should not be null.
var caretPosition = this.GetCaretPosition().Value.Position;
return(new BraceCompletionContext(document, openingSnapshotPoint, closingSnapshotPoint, caretPosition));
}
private BraceCompletionContext?GetBraceCompletionContext()
{
this.AssertIsForeground();
var snapshot = SubjectBuffer.CurrentSnapshot;
var document = snapshot.GetOpenDocumentInCurrentContextWithChanges();
if (document == null)
{
return(null);
}
var closingSnapshotPoint = ClosingPoint.GetPosition(snapshot);
var openingSnapshotPoint = OpeningPoint.GetPosition(snapshot);
// The user is actively typing so the caret position should not be null.
var caretPosition = this.GetCaretPosition().Value.Position;
return(new BraceCompletionContext(document, openingSnapshotPoint, closingSnapshotPoint, caretPosition));
}
