Method Invoke

Web/WebAssemblySession/vtkStandaloneSession.cxx:58–118

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emscripten::val vtkStandaloneSession::Invoke(
  vtkObjectHandle object, const std::string& methodName, emscripten::val args)
{
  if (!args.instanceof (Array))
  {
    vtkLog(
      ERROR, << "Invoke must be called with an objectId: u32, methodName: string, args: Array");
    return emscripten::val::undefined();
  }
  if (auto* manager = static_cast<vtkObjectManager*>(vtkSessionGetManager(this->Session)))
  {
    if (auto* dataArray = vtkDataArray::SafeDownCast(manager->GetObjectAtId(object)))
    {
      if (methodName == "SetArray")
      {
        if (args["length"].as<std::size_t>() == 1)
        {
          auto jsArray = args[0];
          for (const auto& it : IsJSArraySameTypeAsVtkDataArray)
          {
            const auto& typeName = it.first;
            if (jsArray.instanceof (val::global(typeName.c_str())) && it.second(dataArray))
            {
              const auto length = jsArray["length"].as<std::size_t>();
              dataArray->SetNumberOfValues(length);
              // Copy the data from the JS array to the VTK data array
              using DispatchT = vtkArrayDispatch::DispatchByValueType<vtkArrayDispatch::AllTypes>;
              if (!DispatchT::Execute(dataArray, CopyJSArrayToVTKDataArray{}, jsArray))
              {
                // Fallback to the default implementation if the DispatchT fails
                CopyJSArrayToVTKDataArray{}(dataArray, jsArray);
              }
              return emscripten::val::undefined();
            }
          }
          vtkLog(ERROR,
            "Unsupported argument constructed by "
              << jsArray["constructor"].call<std::string>("toString") << " for "
              << dataArray->GetClassName() << "::SetArray"
              << " method.");
          return emscripten::val::undefined();
        }
        else
        {
          vtkLog(ERROR, << "vtkDataArray::SetArray expects a list of a single TypedArray");
          return emscripten::val::undefined();
        }
      }
    }
  }
  else
  {
    vtkLog(ERROR, "Invalid session: " << this->Session);
    return emscripten::val::undefined();
  }
  vtkSessionJsonImpl argsJsonImpl{ args };
  auto resultImpl = vtkSessionInvoke(this->Session, object, methodName.c_str(), &argsJsonImpl);
  auto result = std::move(resultImpl->JsonValue);