/// <summary>
/// Sets the value of a property from the next value of the given
/// enumerator. Optionally applies a transformation function
/// to the argument before assigning.
/// </summary>
private static void SetValue <T>(object container,
CliOptionInternal option,
IEnumerator <string> argsEnumerator,
Func <string, T> transformation)
{
if (!option.PropertyType.IsAssignableFrom(typeof(T)))
{
throw new CliInternalException($"Internal Error when parsing cli " +
$"options: Transformation function for option {option.Flags.First()} " +
$"returns value of type {typeof(T).Name}, but the associated " +
$"property is of type {option.PropertyType}.");
}
if (argsEnumerator.MoveNext())
{
string rawValue = argsEnumerator.Current;
T value = transformation(rawValue);
option.Setter.Invoke(container, new object[] { value });
}
else
{
throw new CliOptionsException($"Value expected for option " +
$"{option.Flags.First()}.");
}
}
/// <summary>
/// Sets the value of a property from the given command line arguments.
/// </summary>
/// <param name="argsEnumerator">
/// An enumerator over the command line arguments.
/// The value of argsEnumerator.Current should be the name of the
/// current option.
/// </param>
private static void SetPropertyFromArgs(object container,
IEnumerator <string> argsEnumerator,
CliOptionInternal option)
{
if (option.PropertyType == typeof(string))
{
SetValue(container, option, argsEnumerator, x => x);
}
else if (option.PropertyType == typeof(bool))
{
option.Setter.Invoke(container, new object[] { true });
}
}
private static string GetHelpForOption(CliOptionInternal option)
{
var flags = string.Join(", ", option.Flags);
return($"{flags}: {option.Description}");
}
