/// <summary>
/// Parses a <see cref="System.String"/> array of command line arguments, setting values in <paramref name="options"/>
/// parameter instance's public fields decorated with appropriate attributes.
/// This overload allows you to specify a <see cref="System.IO.TextWriter"/> derived instance for write text messages.
/// </summary>
/// <param name="args">A <see cref="System.String"/> array of command line arguments.</param>
/// <param name="options">An object's instance used to receive values.
/// Parsing rules are defined using <see cref="CommandLine.BaseOptionAttribute"/> derived types.</param>
/// <param name="helpWriter">Any instance derived from <see cref="System.IO.TextWriter"/>,
/// usually <see cref="System.Console.Error"/>. Setting this argument to null, will disable help screen.</param>
/// <returns>True if parsing process succeed.</returns>
/// <exception cref="System.ArgumentNullException">Thrown if <paramref name="args"/> is null.</exception>
/// <exception cref="System.ArgumentNullException">Thrown if <paramref name="options"/> is null.</exception>
public virtual bool ParseArguments(string[] args, object options, TextWriter helpWriter)
{
Assumes.NotNull(args, "args");
Assumes.NotNull(options, "options");
var pair = ReflectionUtil.RetrieveMethod <HelpOptionAttribute>(options);
if (pair != null && helpWriter != null)
{
if (ParseHelp(args, pair.Right) || !DoParseArguments(args, options))
{
string helpText;
HelpOptionAttribute.InvokeMethod(options, pair, out helpText);
helpWriter.Write(helpText);
return(false);
}
return(true);
}
return(DoParseArguments(args, options));
}
private bool ParseHelp(string[] args, HelpOptionAttribute helpOption)
{
bool caseSensitive = _settings.CaseSensitive;
for (int i = 0; i < args.Length; i++)
{
if (!string.IsNullOrEmpty(helpOption.ShortName))
{
if (ArgumentParser.CompareShort(args[i], helpOption.ShortName, caseSensitive))
return true;
}
if (!string.IsNullOrEmpty(helpOption.LongName))
{
if (ArgumentParser.CompareLong(args[i], helpOption.LongName, caseSensitive))
return true;
}
}
return false;
}
