public CommandLineParser()
{
var properties = typeof(T).GetProperties();
foreach (var propertyInfo in properties)
{
var positionalAttribute = propertyInfo.GetCustomAttribute <PositionalParameterAttribute>();
if (positionalAttribute != null)
{
// NOTE: kind of cheating and we should have some kind of interface - I don't want to do 2 ReadInput.
var item = new ArgumentItem(propertyInfo, positionalAttribute.ToParameterAttribute());
positionalArguments.Add(item);
}
else
{
var item = new ArgumentItem(propertyInfo, propertyInfo.GetCustomAttribute <ParameterAttribute>());
if (item.GetAlias() != 0)
{
aliases.Add(item.GetAlias(), item);
}
if (!string.IsNullOrEmpty(item.GetAction()))
{
actions.Add(item.GetAction(), item);
}
explicitArguments.Add(item);
}
}
}
private void ReadInput(T newItem, ArgumentItem argumentItem, string[] args, ref int i, bool isPositional = false)
{
if (argumentItem.PropertyInfo.PropertyType == typeof(bool))
{
argumentItem.PropertyInfo.SetValue(newItem, true);
}
else if (typeof(IList).IsAssignableFrom(argumentItem.PropertyInfo.PropertyType) && argumentItem.PropertyInfo.PropertyType.IsGenericType)
{
var listType = typeof(List <>);
var listItemType = argumentItem.PropertyInfo.PropertyType.GenericTypeArguments[0];
var constructedListType = listType.MakeGenericType(listItemType);
var list = (IList)Activator.CreateInstance(constructedListType);
if (list == null)
{
throw new NullReferenceException($"The property of type list hasn't been initialized. See {newItem.GetType().Name}.{argumentItem.PropertyInfo.Name}'");
}
var increment = isPositional ? 0 : 1;
for (; i + increment < args.Length; i++)
{
var input = args[i + increment];
if (input.StartsWith('-'))
{
break;
}
list.Add(ConvertValue(input, listItemType, argumentItem.GetConverter()));
}
argumentItem.PropertyInfo.SetValue(newItem, list);
}
else if (argumentItem.PropertyInfo.PropertyType.IsArray)
{
var listItemType = argumentItem.PropertyInfo.PropertyType.GetElementType();
if (listItemType == null)
{
throw new Exception("Since we check the array type, this shouldn't happen.'");
}
var listType = typeof(List <>).MakeGenericType(listItemType);
var list = (IList)Activator.CreateInstance(listType);
var increment = isPositional ? 0 : 1;
for (; i + increment < args.Length; i++)
{
var input = args[i + increment];
if (input.StartsWith('-'))
{
break;
}
list.Add(ConvertValue(input, listItemType, argumentItem.GetConverter()));
}
var array = Array.CreateInstance(listItemType, list.Count);
list.CopyTo(array, 0);
argumentItem.PropertyInfo.SetValue(newItem, array);
}
else if (argumentItem.PropertyInfo.PropertyType.IsEnum)
{
if (Enum.TryParse(argumentItem.PropertyInfo.PropertyType,
ReadParameter(args, ref i, argumentItem.GetAction(), isPositional), true, out var result))
{
argumentItem.PropertyInfo.SetValue(newItem, result);
}
else
{
throw new CommandArgumentException($"Error parsing the enum for property {argumentItem.PropertyInfo.Name}.");
}
}
else if (argumentItem.PropertyInfo.PropertyType == typeof(FileInfo))
{
argumentItem.PropertyInfo.SetValue(newItem,
new FileInfo(ReadParameter(args, ref i, argumentItem.GetAction(), isPositional)));
}
else if (argumentItem.PropertyInfo.PropertyType == typeof(DirectoryInfo))
{
argumentItem.PropertyInfo.SetValue(newItem,
new DirectoryInfo(ReadParameter(args, ref i, argumentItem.GetAction(), isPositional)));
}
else
{
argumentItem.PropertyInfo.SetValue(newItem,
ConvertValue(ReadParameter(args, ref i, argumentItem.GetAction(), isPositional),
argumentItem.PropertyInfo.PropertyType, argumentItem.GetConverter()));
}
}