private static void BuildParameter(ParameterBuilder builder, System.Reflection.ParameterInfo paramInfo, int position, int count, CommandService service, IServiceProvider services)
{
var attributes = paramInfo.GetCustomAttributes();
var paramType = paramInfo.ParameterType;
builder.Name = paramInfo.Name;
builder.IsOptional = paramInfo.IsOptional;
builder.DefaultValue = paramInfo.HasDefaultValue ? paramInfo.DefaultValue : null;
foreach (var attribute in attributes)
{
switch (attribute)
{
case SummaryAttribute summary:
builder.Summary = summary.Text;
break;
case OverrideTypeReaderAttribute typeReader:
builder.TypeReader = GetTypeReader(service, paramType, typeReader.TypeReader, services);
break;
case ParamArrayAttribute _:
builder.IsMultiple = true;
paramType = paramType.GetElementType();
break;
case ParameterPreconditionAttribute precon:
builder.AddPrecondition(precon);
break;
case NameAttribute name:
builder.Name = name.Text;
break;
case RemainderAttribute _:
if (position != count - 1)
{
throw new InvalidOperationException($"Remainder parameters must be the last parameter in a command. Parameter: {paramInfo.Name} in {paramInfo.Member.DeclaringType.Name}.{paramInfo.Member.Name}");
}
builder.IsRemainder = true;
break;
default:
builder.AddAttributes(attribute);
break;
}
}
builder.ParameterType = paramType;
if (builder.TypeReader == null)
{
builder.TypeReader = service.GetDefaultTypeReader(paramType)
?? service.GetTypeReaders(paramType)?.FirstOrDefault().Value;
}
}
void CreateArgument(ParameterBuilder builder)
{
var preconditions = attributes.Where(a => a is ParameterPreconditionAttribute);
foreach (var precondition in preconditions)
{
builder.AddPrecondition(precondition as ParameterPreconditionAttribute);
}
builder.AddAttributes(attributes.Where(a => !(a is ParameterPreconditionAttribute)).ToArray());
builder.IsOptional = parameter.IsOptional;
builder.DefaultValue = parameter.HasDefaultValue ? parameter.DefaultValue : null;
builder.WithSummary(this._metadataProvider.GetArgumentValue(a => a.Summary));
var overrideTypeReader = this._metadataProvider.GetArgumentValue(a => a.TypeReader);
if (overrideTypeReader != null)
{
builder.TypeReader = this.GetTypeReader(builder.ParameterType, overrideTypeReader);
}
var remainder = this._metadataProvider.GetArgumentValue(a => a.Remainder);
if (remainder || position.current == position.total - 1)
{
if (position.current != position.total - 1)
{
throw new InvalidOperationException(
$"Remainder parameters must be the last parameter in a command. Paramerter: {parameter.Name} in {parameter.Member?.DeclaringType?.FullName ?? "Unknown"}.{parameter.Member.Name}");
}
builder.IsRemainder = true;
}
if (builder.TypeReader == null)
{
var readers = this._commandService.TypeReaders.FirstOrDefault(t => t.Key == builder.ParameterType);
TypeReader reader;
if (readers != null)
{
reader = readers.FirstOrDefault();
}
else
{
reader = (TypeReader)typeof(CommandService).GetMethod("GetDefaultTypeReader")?.Invoke(this._commandService, new Object[] { builder.ParameterType }) ?? null;
}
builder.TypeReader = reader;
}
}