/// <summary>
/// Creates an array of the given type from the given arguments
/// </summary>
/// <param name="type"></param>
/// <param name="arguments"></param>
/// <param name="ctx"></param>
/// <returns></returns>
public static object CreateArray(Type type, object[] arguments, IContextObject ctx)
{
Type elementType = type.GetElementType();
IObjectConverter converter = ctx.Registry.GetConverter(elementType);
string failedConvert = $"Failed to convert '{string.Join(" ", arguments)}' to Type {type.Name}.";
string failedCreate = $"failed to create an instance of type {elementType.Name} from argument ";
//Create the generic array of the required size
Array array = (Array)Activator.CreateInstance(type, arguments.Length);
for (int i = 0; i < array.Length; i++)
{
if (converter != null)
{
//if we have a converter, use it
object conversion = converter.ConvertFromString(arguments[i].ToString(), ctx);
if (conversion == null)
{
throw new CommandParsingException(
ParserFailReason.ParsingFailed,
failedConvert,
new Exception($"Conversion failed by '{converter.GetType().Name}.'")
);
}
array.SetValue(conversion, i);
continue;
}
if (elementType == typeof(string))
{
//strings are special, so have special treatment
array.SetValue(arguments[i], i);
continue;
}
if (elementType.GetTypeInfo().IsValueType)
{
//value types can be created with a typeconverter
TypeConverter tc = TypeDescriptor.GetConverter(type.GetElementType());
try
{
//but a bad argument will throw an exception, so handle that
array.SetValue(tc.ConvertFrom(arguments[i]), i);
}
catch (Exception e)
{
throw new CommandParsingException(ParserFailReason.ParsingFailed, $"TypeConverter {failedCreate} '{arguments[i]}'.", e);
}
}
else
{
//reference types need to be created with the Activator
try
{
//once again, bad arguments can throw an exception
object element = Activator.CreateInstance(elementType, arguments[i]);
array.SetValue(element, i);
}
catch (Exception e)
{
throw new CommandParsingException(ParserFailReason.ParsingFailed, $"Activator {failedCreate} '{arguments[i]}'.", e);
}
}
}
return(array);
}
/// <summary>
/// Attempts to convert the arguments provided into objects of types required by the command executor
/// </summary>
/// <param name="ctx"></param>
protected override void ConvertArgumentsToTypes(IContextObject ctx)
{
Objects = new List <object> {
ctx
};
int index = 0;
IEnumerable <object> arguments = Input.ObjectiveExplode();
if (AdditionalArgs != null)
{
arguments = arguments.Concat(AdditionalArgs);
}
foreach (KeyValuePair <ParameterInfo, CommandParameterAttribute> kvp in ExecutorData.ParameterData)
{
//Get the number of arguments going in to the parameter
int count = kvp.Value.Repetitions <= 0 ? arguments.Count() - index
: kvp.Value.Repetitions;
if (index >= arguments.Count())
{
//If we've used all our arguments, just add empty ones to satisfy the
//method signature for the command
Objects.Add(ObjectCreator.CreateDefaultObject(kvp.Key));
continue;
}
object[] args = arguments.ReadToArray(index, count);
//If the provided object is already of the required type, add and continue
if (count == 1 && args[0].GetType() == kvp.Key.ParameterType)
{
Objects.Add(args[0]);
continue;
}
IObjectConverter converter = Registry.GetConverter(kvp.Key.ParameterType);
if (converter == null)
{
//Use the object creator to attempt a conversion
Objects.Add(ObjectCreator.CreateObject(kvp.Key.ParameterType, args, ctx));
}
else
{
//Use a defined converter.
object conversion = count > 1 ? converter.ConvertFromArray((string[])args, ctx)
: converter.ConvertFromString(args[0].ToString(), ctx);
if (conversion == null)
{
throw new CommandParsingException(
ParserFailReason.ParsingFailed,
$"Type conversion failed: Failed to convert '{string.Join(" ", args)}' to Type '{ kvp.Key.ParameterType.Name }'.",
new Exception($"Conversion failed in '{converter.GetType().Name}.{nameof(IObjectConverter.ConvertFromArray)}'")
);
}
Objects.Add(conversion);
}
index += count;
}
}