Function hookGoValueCallMethod

bridge.go:486–529

export hookGoValueCallMethod

(enginep, foldp unsafe.Pointer, reflectIndex C.int, args *C.DataValue)

//export hookGoValueCallMethod
func hookGoValueCallMethod(enginep, foldp unsafe.Pointer, reflectIndex C.int, args *C.DataValue) {
	fold := ensureEngine(enginep, foldp)
	v := reflect.ValueOf(fold.gvalue)

	// TODO Must assert that v is necessarily a pointer here, but we shouldn't have to manipulate
	//      gvalue here for that. This should happen in a sensible place in the wrapping functions
	//      that can still error out to the user in due time.

	method := v.Method(int(reflectIndex))
	methodt := method.Type()
	methodName := v.Type().Method(int(reflectIndex)).Name

	// TODO Ensure methods with more parameters than this are not registered.
	var params [C.MaxParams]reflect.Value
	var err error

	numIn := methodt.NumIn()
	for i := 0; i < numIn; i++ {
		paramdv := (*C.DataValue)(unsafe.Pointer(uintptr(unsafe.Pointer(args)) + (uintptr(i)+1)*dataValueSize))
		param := reflect.ValueOf(unpackDataValue(paramdv, fold.engine))
		if argt := methodt.In(i); param.Type() != argt {
			param, err = convertParam(methodName, i, param, argt)
			if err != nil {
				panic(err.Error())
			}
		}
		params[i] = param
	}

	result := method.Call(params[:numIn])

	if len(result) == 1 {
		packDataValue(result[0].Interface(), args, fold.engine, jsOwner)
	} else if len(result) > 1 {
		if len(result) > len(dataValueArray) {
			panic("function has too many results")
		}
		for i, v := range result {
			packDataValue(v.Interface(), &dataValueArray[i], fold.engine, jsOwner)
		}
		args.dataType = C.DTVariantList
		*(*unsafe.Pointer)(unsafe.Pointer(&args.data)) = C.newVariantList(&dataValueArray[0], C.int(len(result)))
	}
}

func convertParam(methodName string, index int, param reflect.Value, argt reflect.Type) (reflect.Value, error) {
	out := reflect.New(argt).Elem()