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using Ryujinx.Common.Configuration.Hid.Controller;
using Ryujinx.Common.Configuration.Hid.Keyboard;
using Ryujinx.Common.Utilities;
using System;
using System.Text.Json;
using System.Text.Json.Serialization;
namespace Ryujinx.Common.Configuration.Hid
{
public class JsonInputConfigConverter : JsonConverter<InputConfig>
{
private static readonly InputConfigJsonSerializerContext SerializerContext = new(JsonHelper.GetDefaultSerializerOptions());
private static InputBackendType GetInputBackendType(ref Utf8JsonReader reader)
{
// Temporary reader to get the backend type
Utf8JsonReader tempReader = reader;
InputBackendType result = InputBackendType.Invalid;
while (tempReader.Read())
{
// NOTE: We scan all properties ignoring the depth entirely on purpose.
// The reason behind this is that we cannot track in a reliable way the depth of the object because Utf8JsonReader never emit the first TokenType == StartObject if the json start with an object.
// As such, this code will try to parse very field named "backend" to the correct enum.
if (tempReader.TokenType == JsonTokenType.PropertyName)
{
string propertyName = tempReader.GetString();
if (propertyName.Equals("backend"))
{
tempReader.Read();
if (tempReader.TokenType == JsonTokenType.String)
{
string backendTypeRaw = tempReader.GetString();
if (!Enum.TryParse(backendTypeRaw, out result))
{
result = InputBackendType.Invalid;
}
else
{
break;
}
}
}
}
}
return result;
}
public override InputConfig Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
{
InputBackendType backendType = GetInputBackendType(ref reader);
return backendType switch
{
InputBackendType.WindowKeyboard => JsonSerializer.Deserialize(ref reader, SerializerContext.StandardKeyboardInputConfig),
InputBackendType.GamepadSDL2 => JsonSerializer.Deserialize(ref reader, SerializerContext.StandardControllerInputConfig),
_ => throw new InvalidOperationException($"Unknown backend type {backendType}"),
};
}
public override void Write(Utf8JsonWriter writer, InputConfig value, JsonSerializerOptions options)
{
switch (value.Backend)
{
case InputBackendType.WindowKeyboard:
JsonSerializer.Serialize(writer, value as StandardKeyboardInputConfig, SerializerContext.StandardKeyboardInputConfig);
break;
case InputBackendType.GamepadSDL2:
JsonSerializer.Serialize(writer, value as StandardControllerInputConfig, SerializerContext.StandardControllerInputConfig);
break;
default:
throw new ArgumentException($"Unknown backend type {value.Backend}");
}
}
}
}
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