/// <summary>
/// When output the usage, this function will generate the flag string
/// Such as "-time n1 n2..." string.
/// </summary>
/// <param name="argument">Argument attribute.</param>
/// <returns>Argument presentation on command line.</returns>
private static string GetFlagAndPlaceHolderString(ArgumentAttribute argument)
{
return (!string.IsNullOrEmpty(argument.OptionName) ? "-" : string.Empty) +
argument.OptionName +
(string.IsNullOrEmpty(argument.UsagePlaceholder) ?
string.Empty : " " + argument.UsagePlaceholder);
}
/// <summary>
/// Initializes a new instance of the <see cref="Destination"/> class.
/// </summary>
/// <param name="fieldInfo">Field information.</param>
/// <param name="argument">Argument attribute.</param>
/// <param name="internalTarget">Internal flags.</param>
public Destination(FieldInfo fieldInfo, ArgumentAttribute argument, InternalFlags internalTarget)
{
_fieldInfo = fieldInfo;
_argument = argument;
_internalTarget = internalTarget;
// _AlreadySaved = false;
_parameterList = fieldInfo.FieldType.IsArray ? new ArrayList() : null;
}
/// <summary>
/// Build optional line string for a argument.
/// </summary>
/// <param name="argument">Argument attribute.</param>
/// <returns>Optional line string.</returns>
private static string BuildOptionLine(ArgumentAttribute argument)
{
StringBuilder sb = new StringBuilder();
if (!argument.Hidden)
{
if (argument.Optional)
{
sb.AppendFormat(CultureInfo.InvariantCulture,
" [{0}]", GetFlagAndPlaceHolderString(argument));
}
else
{
sb.AppendFormat(CultureInfo.InvariantCulture,
" {0}", GetFlagAndPlaceHolderString(argument));
}
}
else
{
if (!argument.Optional)
{
string message = string.Format(CultureInfo.InvariantCulture,
"Argument for -{0} can be hidden but can not be optional at the meantime.",
argument.OptionName);
Debug.Assert(argument.Optional, message);
throw new ArgumentException(message);
}
}
return sb.ToString();
}