TimePasses/Model/IWhen.cs

using YamlDotNet.Core;
using YamlDotNet.Core.Events;
using YamlDotNet.Serialization.BufferedDeserialization.TypeDiscriminators;

namespace TimePasses.Model;

public interface IWhen {
    string Text { get; }
    bool Slowly { get; }

    bool IsValid(Plugin plugin);
}

public class WhenDiscriminator : ITypeDiscriminator {
    public Type BaseType => typeof(IWhen);

    public bool TryDiscriminate(IParser buffer, out Type? suggestedType) {
        buffer.Consume<MappingStart>();
        var name = buffer.Consume<Scalar>();
        if (!name.IsKey) {
            suggestedType = null;
            return false;
        }

        switch (name.Value) {
            case "quest": {
                suggestedType = typeof(WhenQuest);
                break;
            }
            default: {
                suggestedType = null;
                return false;
            }
        }

        return true;
    }
}