internal static IGen <T> SelectError <T>(this IGen <T> gen, Func <IGenErrorData, IGenErrorData> errorSelector)
{
IGenIteration <T> SelectError(IGenError <T> error)
{
var selectedErrorData = errorSelector(error);
return(GenIterationFactory.Error <T>(
error.ReplayParameters,
error.NextParameters,
selectedErrorData.GenName,
selectedErrorData.Message));
}
GenIterationTransformation <T, T> transformation = (iteration) =>
{
return(iteration.Match(
onError: error => SelectError(error),
onInstance: instance => instance,
onDiscard: discard => discard));
};
return(gen.TransformIterations(transformation));
}
public static IGen <U> TransformIterations <T, U>(
this IGen <T> gen,
GenIterationTransformation <T, U> transformation) =>
gen.TransformStream(stream => stream.Select(transformation.Invoke));
