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using System.IO;
using System.Text;
using System.Text.Json;
using System.Text.Json.Serialization.Metadata;
namespace Ryujinx.Common.Utilities
{
public class JsonHelper
{
private static readonly JsonNamingPolicy _snakeCasePolicy = new SnakeCaseNamingPolicy();
private const int DefaultFileWriteBufferSize = 4096;
/// <summary>
/// Creates new serializer options with default settings.
/// </summary>
/// <remarks>
/// It is REQUIRED for you to save returned options statically or as a part of static serializer context
/// in order to avoid performance issues. You can safely modify returned options for your case before storing.
/// </remarks>
public static JsonSerializerOptions GetDefaultSerializerOptions(bool indented = true)
{
JsonSerializerOptions options = new()
{
DictionaryKeyPolicy = _snakeCasePolicy,
PropertyNamingPolicy = _snakeCasePolicy,
WriteIndented = indented,
AllowTrailingCommas = true,
ReadCommentHandling = JsonCommentHandling.Skip,
};
return options;
}
public static string Serialize<T>(T value, JsonTypeInfo<T> typeInfo)
{
return JsonSerializer.Serialize(value, typeInfo);
}
public static T Deserialize<T>(string value, JsonTypeInfo<T> typeInfo)
{
return JsonSerializer.Deserialize(value, typeInfo);
}
public static void SerializeToFile<T>(string filePath, T value, JsonTypeInfo<T> typeInfo)
{
using FileStream file = File.Create(filePath, DefaultFileWriteBufferSize, FileOptions.WriteThrough);
JsonSerializer.Serialize(file, value, typeInfo);
}
public static T DeserializeFromFile<T>(string filePath, JsonTypeInfo<T> typeInfo)
{
using FileStream file = File.OpenRead(filePath);
return JsonSerializer.Deserialize(file, typeInfo);
}
public static void SerializeToStream<T>(Stream stream, T value, JsonTypeInfo<T> typeInfo)
{
JsonSerializer.Serialize(stream, value, typeInfo);
}
private class SnakeCaseNamingPolicy : JsonNamingPolicy
{
public override string ConvertName(string name)
{
if (string.IsNullOrEmpty(name))
{
return name;
}
StringBuilder builder = new();
for (int i = 0; i < name.Length; i++)
{
char c = name[i];
if (char.IsUpper(c))
{
if (i == 0 || char.IsUpper(name[i - 1]))
{
builder.Append(char.ToLowerInvariant(c));
}
else
{
builder.Append('_');
builder.Append(char.ToLowerInvariant(c));
}
}
else
{
builder.Append(c);
}
}
return builder.ToString();
}
}
}
}
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