/// <summary>Visit the different tokens of a packed tuple</summary>
/// <param name="reader">Reader positionned at the start of a packed tuple</param>
/// <param name="visitor">Lambda called for each segment of a tuple. Returns true to continue parsing, or false to stop</param>
/// <returns>Number of tokens that have been visited until either <paramref name="visitor"/> returned false, or <paramref name="reader"/> reached the end.</returns>
public static T VisitNext <T>(ref TupleReader reader, Func <Slice, FdbTupleSegmentType, T> visitor)
{
if (!reader.Input.HasMore)
{
throw new InvalidOperationException("The reader has already reached the end");
}
var token = FdbTupleParser.ParseNext(ref reader);
return(visitor(token, FdbTupleTypes.DecodeSegmentType(ref token)));
}
/// <summary>Skip a number of tokens</summary>
/// <param name="reader">Cursor in the packed tuple to decode</param>
/// <param name="count">Number of tokens to skip</param>
/// <returns>True if there was <paramref name="count"/> tokens, false if the reader was too small.</returns>
/// <remarks>Even if this method return true, you need to check that the reader has not reached the end before reading more token!</remarks>
public static bool Skip(ref TupleReader reader, int count)
{
while (count-- > 0)
{
if (!reader.Input.HasMore)
{
return(false);
}
var token = FdbTupleParser.ParseNext(ref reader);
if (token.IsNull)
{
return(false);
}
}
return(true);
}