protected OptionsBase()
{
// default filters
this.DataContractTest = m => AttributeUtils.HasAttribute <DataContractAttribute>(m, false);
this.DataMemberTest = m => AttributeUtils.HasAttribute <DataMemberAttribute>(m, true);
this.Hook = new NullHook();
}
private IEnumerable <IObjectMemberContext> WalkDataMembers()
{
ObjectWalker walker = new ObjectWalker(
delegate(MemberInfo member)
{
return(AttributeUtils.HasAttribute <CommandLineParameterAttribute>(member));
});
walker.IncludeNonPublicFields = true;
walker.IncludeNonPublicProperties = true;
return(walker.Walk(this));
}
private void ProcessAttributes()
{
foreach (IObjectMemberContext context in WalkDataMembers())
{
CommandLineParameterAttribute a = AttributeUtils.GetAttribute <CommandLineParameterAttribute>(context.Member);
if (a != null)
{
if (a.Position > -1)
{
// treat as positional
ValidateMemberType(context.Member.Name, new Type[] { typeof(string) }, context.MemberType);
if (_positionalArgs.Count > a.Position)
{
context.MemberValue = _positionalArgs[a.Position];
}
else
{
if (a.Required)
{
throw new CommandLineException(string.Format("Missing required command line argument <{0}>", a.DisplayName));
}
}
}
else
{
// treat as named/switch
if (context.MemberType == typeof(bool))
{
ValidateMemberType(context.Member.Name, new Type[] { typeof(bool) }, context.MemberType);
SetMemberValue(a, context, _switches);
}
else
{
ValidateMemberType(context.Member.Name, new Type[] { typeof(string), typeof(int), typeof(Enum) }, context.MemberType);
SetMemberValue(a, context, _namedArgs);
}
}
}
}
}
/// <summary>
/// Generates a usage message, based on meta-data supplied by <see cref="CommandLineParameterAttribute"/>s declared
/// on members of the subclass.
/// </summary>
/// <param name="writer"></param>
public void PrintUsage(TextWriter writer)
{
List <string> positionals = new List <string>();
List <string> options = new List <string>();
foreach (IObjectMemberContext context in WalkDataMembers())
{
CommandLineParameterAttribute a = AttributeUtils.GetAttribute <CommandLineParameterAttribute>(context.Member);
if (a.Position > -1)
{
positionals.Add(string.Format(a.Required ? "{0}" : "[{0}]", a.DisplayName));
}
else
{
string format = context.MemberType == typeof(bool) ? "/{0}[+|-]\t{1}" : "/{0}:(value)\t{1}";
string s = string.Format(format, a.Key, a.Usage);
if (!string.IsNullOrEmpty(a.KeyShortForm))
{
s += string.Format(" (Short form: /{0})", a.KeyShortForm);
}
options.Add(s);
}
}
writer.Write("Usage: ");
if (options.Count > 0)
{
writer.Write("[options] ");
}
positionals.ForEach(delegate(string s) { writer.Write("{0} ", s); });
writer.WriteLine();
if (options.Count > 0)
{
writer.WriteLine("Options:");
options.ForEach(delegate(string s) { writer.WriteLine(s); });
}
}