public virtual object Execute(ExecutionInformation info, IReadOnlyList <ICommand> arguments, IReadOnlyList <Type> returnTypes)
{
var filterLazy = info.GetFilterLazy();
foreach (var type in returnTypes)
{
try
{
var result = FunctionCommand.ConvertParam(Content, type, filterLazy);
Log.Debug("Converting command result {0} to {1} returns {2}", Content, type, result);
return(ResultHelper.ToResult(type, result));
}
catch (Exception ex)
{
Log.Debug(ex, "Converting command result {0} to {1} failed", Content, type);
}
}
throw new CommandException(strings.error_cmd_no_matching_overload, CommandExceptionReason.NoReturnMatch);
}
/// <summary>
/// Try to fit the given arguments to the underlying function.
/// This function will throw an exception if the parameters can't be applied.
/// The parameters that are extracted from the arguments will be returned if they can be applied successfully.
/// </summary>
/// <param name="info">The current call <see cref="ExecutionInformation"/>.</param>
/// <param name="arguments">The arguments that are applied to this function.</param>
/// <param name="returnTypes">The possible return types.</param>
/// <param name="takenArguments">How many arguments could be set.</param>
private object[] FitArguments(ExecutionInformation info, IReadOnlyList <ICommand> arguments, IReadOnlyList <Type> returnTypes, out int takenArguments)
{
var parameters = new object[CommandParameter.Length];
var filterLazy = info.GetFilterLazy();
// takenArguments: Index through arguments which have been moved into a parameter
// p: Iterate through parameters
takenArguments = 0;
for (int p = 0; p < parameters.Length; p++)
{
var arg = CommandParameter[p].Type;
switch (CommandParameter[p].Kind)
{
case ParamKind.SpecialArguments:
parameters[p] = arguments;
break;
case ParamKind.SpecialReturns:
parameters[p] = returnTypes;
break;
case ParamKind.Dependency:
if (info.TryGet(arg, out var obj))
{
parameters[p] = obj;
}
else if (CommandParameter[p].Optional)
{
parameters[p] = null;
}
else
{
throw new MissingContextCommandException($"Command '{internCommand.Name}' missing execution context '{arg.Name}'", arg);
}
break;
case ParamKind.NormalCommand:
if (takenArguments >= arguments.Count)
{
parameters[p] = GetDefault(arg); break;
}
parameters[p] = arguments[takenArguments];
takenArguments++;
break;
case ParamKind.NormalParam:
case ParamKind.NormalTailString:
if (takenArguments >= arguments.Count)
{
parameters[p] = GetDefault(arg); break;
}
var types = GetTypes(arg);
if (CommandParameter[p].Kind == ParamKind.NormalTailString)
{
types.Insert(0, typeof(TailString));
}
var argResultP = arguments[takenArguments].Execute(info, Array.Empty <ICommand>(), types);
if (CommandParameter[p].Kind == ParamKind.NormalTailString && argResultP is TailString tailString)
{
parameters[p] = tailString.Tail;
}
else
{
parameters[p] = ConvertParam(UnwrapPrimitive(argResultP), arg, filterLazy);
}
takenArguments++;
break;
case ParamKind.NormalArray:
if (takenArguments >= arguments.Count)
{
parameters[p] = GetDefault(arg); break;
}
var typeArr = arg.GetElementType();
var args = Array.CreateInstance(typeArr, arguments.Count - takenArguments);
for (int i = 0; i < args.Length; i++, takenArguments++)
{
var argResultA = arguments[takenArguments].Execute(info, Array.Empty <ICommand>(), GetTypes(typeArr));
var convResult = ConvertParam(UnwrapPrimitive(argResultA), typeArr, filterLazy);
args.SetValue(convResult, i);
}
parameters[p] = args;
break;
default:
throw Tools.UnhandledDefault(CommandParameter[p].Kind);
}
}
// Check if we were able to set enough arguments
int wantArgumentCount = Math.Min(parameters.Length, RequiredParameters);
if (takenArguments < wantArgumentCount && !returnTypes.Contains(typeof(ICommand)))
{
throw ThrowAtLeastNArguments(wantArgumentCount);
}
return(parameters);
}