private static void HandleStartObject(JsonSerializerOptions options, ref ReadStack state)
{
if (state.Current.Skip())
{
state.Push();
state.Current.Drain = true;
return;
}
if (state.Current.IsDictionary())
{
// Fall through and treat as a return value.
}
else if (state.Current.IsEnumerable() || state.Current.IsPropertyEnumerable() || state.Current.IsPropertyADictionary())
{
// An array of objects either on the current property or on a list
Type objType = state.Current.GetElementType();
state.Push();
state.Current.JsonClassInfo = options.GetOrAddClass(objType);
}
else if (state.Current.JsonPropertyInfo != null)
{
// Nested object
Type objType = state.Current.JsonPropertyInfo.RuntimePropertyType;
state.Push();
state.Current.JsonClassInfo = options.GetOrAddClass(objType);
}
JsonClassInfo classInfo = state.Current.JsonClassInfo;
state.Current.ReturnValue = classInfo.CreateObject();
}
internal bool TryRead(ref BinaryReader reader, Type typeToConvert, BinarySerializerOptions options, ref ReadStack state, out ReferenceID refId, out T value)
{
//if (state.Current.BinaryPropertyInfo != null && state.Current.BinaryPropertyInfo.ClassType != ClassType)
//{
// // TODO
// throw new Exception();
//}else if(state.Current.BinaryPropertyInfo == null && state.Current.BinaryClassInfo!=null && state.Current.BinaryClassInfo.ClassType != ClassType)
//{
// throw new Exception();
//}
refId = default;
if (ClassType == ClassType.Value)
{
// A value converter should never be within a continuation.
//Debug.Assert(!state.IsContinuation);
// For perf and converter simplicity, handle null here instead of forwarding to the converter.
if (reader.TokenType == BinaryTokenType.Null && !HandleNullOnRead)
{
if (!CanBeNull)
{
ThrowHelper.ThrowBinaryException_DeserializeUnableToConvertValue(TypeToConvert);
}
value = default;
return(true);
}
if (reader.CurrentTypeInfo.Type == TypeEnum.Nullable ||
// 当Nullable读取需要请求更多数据时，通过此判断进入
//（此时Converter可能已经读取了Nullable的实际类型，reader的当前类型信息已经发生了变化）
(state.Current.BinaryClassInfo != null &&
state.Current.PropertyState > StackFramePropertyState.None &&
state.Current.BinaryPropertyInfo != null &&
state.TypeMap.GetTypeInfo(state.Current.BinaryPropertyInfo.TypeSeq).Type == TypeEnum.Nullable))
{
state.Push(reader.CurrentTypeInfo);
bool isSuccess = OnTryRead(ref reader, typeToConvert, options, ref state, out value);
state.Pop(isSuccess);
return(isSuccess);
}
int readCount = GetBytesCount(ref reader, options);
// 读取指定数量的字节
if (readCount > 0)
{
if (!reader.ReadBytes(readCount))
{
value = default;
return(false);
}
}
else if (readCount == BinarySerializerConstants.BytesCount_Dynamic)
{
if (!reader.ReadBytes())
{
value = default;
return(false);
}
}
else if (readCount == BinarySerializerConstants.BytesCount_Auto)
{
// 自动
bool isContinue = !reader.TryReadValue(out bool isOk);
if (!isOk)
{
ThrowHelper.ThrowBinaryException();
}
else if (isContinue)
{
value = default;
return(false);
}
}
// #if !DEBUG
// For performance, only perform validation on internal converters on debug builds.
if (IsInternalConverter)
{
value = Read(ref reader, typeToConvert, options);
}
else
// #endif
{
BinaryTokenType originalPropertyTokenType = reader.TokenType;
// int originalPropertyDepth = reader.CurrentDepth;
long originalPropertyBytesConsumed = reader.BytesConsumed;
value = Read(ref reader, typeToConvert, options);
//VerifyRead(
// originalPropertyTokenType,
// originalPropertyDepth,
// originalPropertyBytesConsumed,
// isValueConverter: true,
// ref reader);
}
//if (CanBePolymorphic && options.ReferenceHandler != null && value is BinaryElement element)
//{
// // Edge case where we want to lookup for a reference when parsing into typeof(object)
// // instead of return `value` as a BinaryElement.
// Debug.Assert(TypeToConvert == typeof(object));
// if (BinarySerializer.TryGetReferenceFromBinaryElement(ref state, element, out object? referenceValue))
// {
// value = (T?)referenceValue;
// }
//}
return(true);
}
bool success;
bool wasContinuation = state.IsContinuation;
if (!wasContinuation && reader.TokenType == BinaryTokenType.Null && state.Current.ObjectState < StackFrameObjectState.CreatedObject)
{
value = default;
return(true);
}
// Remember if we were a continuation here since Push() may affect IsContinuation.
// Console.WriteLine(reader.CurrentTypeInfo);
// if (!isPolymorphic)
// {
state.Push(reader.CurrentTypeInfo);
// }
//if (CanBePolymorphic)
//{
// Type type = state.TypeMap.GetType((state.Current.PolymorphicBinaryTypeInfo?? state.Current.BinaryTypeInfo).Seq);
// if (type != TypeToConvert)
// {
// // state.Current
// var binaryConverter = state.Current.InitializeReEntry(type, options);
// if (binaryConverter != this)
// {
// // We found a different converter; forward to that.
// if (binaryConverter.TryReadAsObject(ref reader, options, ref state, out object tmpValue))
// {
// value = (T)tmpValue;
// return true;
// }
// else
// {
// value = default;
// return false;
// }
// }
// }
// else
// {
// }
//}
// For performance, only perform validation on internal converters on debug builds.
if (IsInternalConverter)
{
if (reader.TokenType == BinaryTokenType.Null && !HandleNullOnRead && !wasContinuation)
{
if (!CanBeNull)
{
ThrowHelper.ThrowBinaryException_DeserializeUnableToConvertValue(TypeToConvert);
}
// For perf and converter simplicity, handle null here instead of forwarding to the converter.
value = default;
success = true;
}
else
{
success = OnTryRead(ref reader, typeToConvert, options, ref state, out value);
}
}
else
{
if (!wasContinuation)
{
// For perf and converter simplicity, handle null here instead of forwarding to the converter.
if (reader.TokenType == BinaryTokenType.Null && !HandleNullOnRead)
{
if (!CanBeNull)
{
ThrowHelper.ThrowBinaryException_DeserializeUnableToConvertValue(TypeToConvert);
}
value = default;
state.Pop(true);
return(true);
}
Debug.Assert(state.Current.OriginalTokenType == BinaryTokenType.None);
state.Current.OriginalTokenType = reader.TokenType;
Debug.Assert(state.Current.OriginalDepth == 0);
// state.Current.OriginalDepth = reader.CurrentDepth;
}
success = OnTryRead(ref reader, typeToConvert, options, ref state, out value);
if (success)
{
if (state.IsContinuation)
{
// The resumable converter did not forward to the next converter that previously returned false.
ThrowHelper.ThrowBinaryException_SerializationConverterRead(this);
}
VerifyRead(
state.Current.OriginalTokenType,
state.Current.OriginalDepth,
bytesConsumed: 0,
isValueConverter: false,
ref reader);
// No need to clear state.Current.* since a stack pop will occur.
}
}
if (success && state.Current.RefState == RefState.Start)
{
refId = (ReferenceID)state.Current.ReturnValue;
}
// if (!isPolymorphic)
// {
state.Pop(success);
// }
return(success);
}