internal TypeReader GetDefaultTypeReader(Type type)
{
if (_defaultTypeReaders.TryGetValue(type, out var reader))
{
return(reader);
}
var typeInfo = type.GetTypeInfo();
//Is this an enum?
if (typeInfo.IsEnum)
{
reader = EnumTypeReader.GetReader(type);
_defaultTypeReaders[type] = reader;
return(reader);
}
//Is this an entity?
for (int i = 0; i < _entityTypeReaders.Count; i++)
{
if (type == _entityTypeReaders[i].Item1 || typeInfo.ImplementedInterfaces.Contains(_entityTypeReaders[i].Item1))
{
reader = Activator.CreateInstance(_entityTypeReaders[i].Item2.MakeGenericType(type)) as TypeReader;
_defaultTypeReaders[type] = reader;
return(reader);
}
}
return(null);
}
private IReadOnlyList <CommandParameter> BuildParameters(MethodInfo methodInfo)
{
var parameters = methodInfo.GetParameters();
if (parameters.Length == 0 || parameters[0].ParameterType != typeof(IUserMessage))
{
throw new InvalidOperationException($"The first parameter of a command must be {nameof(IUserMessage)}.");
}
var paramBuilder = ImmutableArray.CreateBuilder <CommandParameter>(parameters.Length - 1);
for (int i = 1; i < parameters.Length; i++)
{
var parameter = parameters[i];
var type = parameter.ParameterType;
//Detect 'params'
bool isMultiple = parameter.GetCustomAttribute <ParamArrayAttribute>() != null;
if (isMultiple)
{
type = type.GetElementType();
}
var reader = Module.Service.GetTypeReader(type);
var typeInfo = type.GetTypeInfo();
//Detect enums
if (reader == null && typeInfo.IsEnum)
{
reader = EnumTypeReader.GetReader(type);
Module.Service.AddTypeReader(type, reader);
}
if (reader == null)
{
throw new InvalidOperationException($"{type.FullName} is not supported as a command parameter, are you missing a TypeReader?");
}
bool isRemainder = parameter.GetCustomAttribute <RemainderAttribute>() != null;
if (isRemainder && i != parameters.Length - 1)
{
throw new InvalidOperationException("Remainder parameters must be the last parameter in a command.");
}
string name = parameter.Name;
string summary = parameter.GetCustomAttribute <SummaryAttribute>()?.Text;
bool isOptional = parameter.IsOptional;
object defaultValue = parameter.HasDefaultValue ? parameter.DefaultValue : null;
paramBuilder.Add(new CommandParameter(parameters[i], name, summary, type, reader, isOptional, isRemainder, isMultiple, defaultValue));
}
return(paramBuilder.ToImmutable());
}
