ISerializer.cs

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using Fauna.Exceptions;
using Fauna.Mapping;
 
namespace Fauna.Serialization;
 
public interface ISerializer<out T> : ISerializer
{
    new T Deserialize(MappingContext ctx, ref Utf8FaunaReader reader);
}
 
public interface ISerializer
{
    object? Deserialize(MappingContext ctx, ref Utf8FaunaReader reader);
 
    void Serialize(MappingContext ctx, Utf8FaunaWriter writer, object? o);
 
    List<FaunaType> GetSupportedTypes();
}
 
public abstract class BaseSerializer<T> : ISerializer<T>
{
    public virtual List<FaunaType> GetSupportedTypes() => new List<FaunaType>();
 
    protected static TokenType EndTokenFor(TokenType start)
    {
        return start switch
        {
            TokenType.StartObject => TokenType.EndObject,
            TokenType.StartArray => TokenType.EndArray,
            TokenType.StartPage => TokenType.EndPage,
            TokenType.StartRef => TokenType.EndRef,
            TokenType.StartDocument => TokenType.EndDocument,
            _ => throw new ArgumentOutOfRangeException(nameof(start), start, null)
        };
    }
 
    protected string UnsupportedSerializationTypeMessage(Type type) => $"Cannot serialize `{type}` with `{GetType()}`";
 
    protected string UnexpectedTypeDecodingMessage(FaunaType faunaType) =>
        $"Unable to deserialize `{faunaType.GetType().Name}.{faunaType}` with `{GetType().Name}`. " +
        $"Supported types are [{string.Join(", ", GetSupportedTypes().Select(x => $"{x.GetType().Name}.{x}"))}]";
 
    object? ISerializer.Deserialize(MappingContext ctx, ref Utf8FaunaReader reader) =>
        Deserialize(ctx, ref reader);
 
    public abstract T Deserialize(MappingContext ctx, ref Utf8FaunaReader reader);
 
    void ISerializer.Serialize(MappingContext context, Utf8FaunaWriter writer, object? o) =>
        Serialize(context, writer, o);
 
    public abstract void Serialize(MappingContext context, Utf8FaunaWriter writer, object? o);
 
    protected static SerializationException UnexpectedToken(TokenType token) =>
        new($"Unexpected token while deserializing: {token}");
}