public string TryParse(string source, ref int index, ref JsonPath path)
{
if (path == null)
{
return("Start token not found.");
}
index += 2;
var error = source.GetSlices(ref index, out var slices);
if (error != null)
{
return(error);
}
path = path.SearchArray(slices.ToArray());
return(null);
}