private void ProcessIndexCapture(SyntaxTrivia syntaxTrivia, Capture capture, string setName)
{
var charStr = capture.Value;
if (int.TryParse(charStr, out int charIndex) == false)
{
throw new FormatException($"Comment '{syntaxTrivia.Text}' contains a completion test directive with an invalid character index '{charStr}'. Please specify a valid 32-bit integer.");
}
// this is the position of the end of the comment
var commentEndPosition = PositionHelper.GetPosition(this.lineStarts, syntaxTrivia.GetEndPosition());
// the trigger should apply to the char index at the next line
var triggerPosition = new Position(commentEndPosition.Line + 1, charIndex);
this.triggers.Add(new CompletionTrigger(triggerPosition, setName));
}