public override void Execute(ICpu cpu) { string suffixName = cpu.PopStack().ToString().ToUpper(); object popValue = cpu.PopValueEncapsulated(); var specialValue = popValue as ISuffixed; if (specialValue == null) { throw new Exception(string.Format("Values of type {0} cannot have suffixes", popValue.GetType())); } ISuffixResult result = specialValue.GetSuffix(suffixName); // If the result is a suffix that is still in need of being invoked and hasn't resolved to a value yet: if (result != null && !IsMethodCallAttempt && !result.HasValue) { // This is what happens when someone tries to call a suffix method as if // it wasn't a method (i.e. leaving the parentheses off the call). The // member returned is a delegate that needs to be called to get its actual // value. Borrowing the same routine that OpcodeCall uses for its method calls: cpu.PushStack(result); cpu.PushStack(new KOSArgMarkerType()); OpcodeCall.StaticExecute(cpu, false, "", false); // this will push the return value on the stack for us. } else { if (result.HasValue) { // Push the already calculated value. cpu.PushStack(result.Value); } else { // Push the indirect suffix delegate, but don't execute it yet // because we need to put the upcoming arg list above it on the stack. // Eventually an <indirect> OpcodeCall will occur further down the program which // will actually execute this. cpu.PushStack(result); } } }
public override void Execute(ICpu cpu) { cpu.PushStack(cpu.PopValueEncapsulated()); }