public override string GetDataTipText(int line, int col, out TextSpan span)
{
span = new TextSpan();
var token = source.GetTokenInfo(line, col);
span.iStartLine = line;
span.iEndLine = line;
span.iStartIndex = token.StartIndex;
span.iEndIndex = token.EndIndex + 1;
return parseRequestProcessor.GetQuickInfo(line, col, parseRequest);
}