/// <summary>
/// Sets the value of a member property/field from the specified source dictionary.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="a"></param>
/// <param name="context"></param>
/// <param name="source"></param>
private void SetMemberValue <T>(CommandLineParameterAttribute a, IObjectMemberContext context, IDictionary <string, T> source)
{
string[] keys = new string[] { a.Key, a.KeyShortForm ?? "" };
// T will be either bool or string, depending on whether source is "Switches" or "Named"
foreach (string key in keys)
{
if (source.ContainsKey(key))
{
T value = source[key];
if (context.MemberType == typeof(T))
{
context.MemberValue = value;
}
else if (context.MemberType.IsEnum)
{
try
{
context.MemberValue = Enum.Parse(context.MemberType, value.ToString(), true);
}
catch (Exception)
{
throw new CommandLineException(
string.Format("Invalid option for named command line argument: {0} ({1})",
value,
StringUtilities.Combine(keys, ", ")));
}
}
else if (context.MemberType == typeof(int))
{
context.MemberValue = int.Parse(value.ToString());
}
return;
}
}
if (a.Required)
{
throw new CommandLineException(
string.Format("Missing required command line argument <{0}> ({1})",
a.Usage,
StringUtilities.Combine(keys, ", ")));
}
}
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); });
}
}
