/// <summary>Test if the start of current tuple is equal to another tuple</summary>
/// <param name="left">Larger tuple</param>
/// <param name="right">Smaller tuple</param>
/// <returns>True if the beginning of <paramref name="left"/> is equal to <paramref name="right"/> or if both tuples are identical</returns>
public static bool StartsWith([NotNull] this ITuple left, [NotNull] ITuple right)
{
if (left == null)
{
throw new ArgumentNullException(nameof(left));
}
if (right == null)
{
throw new ArgumentNullException(nameof(right));
}
//REVIEW: move this on ITuple interface ?
return(STuple.StartsWith(left, right));
}
/// <summary>Create a formatter that just add or remove a prefix to values</summary>
public static ITupleFormatter <T> CreateAppender(ITuple prefix)
{
if (prefix == null)
{
throw new ArgumentNullException(nameof(prefix));
}
return(new AnonymousTupleFormatter <T>(
(value) => prefix.Append <T>(value),
(tuple) =>
{
if (tuple.Count != prefix.Count + 1)
{
throw new ArgumentException("Tuple size is invalid", nameof(tuple));
}
if (!STuple.StartsWith(tuple, prefix))
{
throw new ArgumentException("Tuple does not start with the expected prefix", nameof(tuple));
}
return tuple.Last <T>();
}
));
}
