jtr/DevDisciples.Parsing/VisitorContainer.cs

namespace DevDisciples.Parsing;

public class VisitorContainer<TBase>
{
    private Dictionary<Type, Visitor.Visit<TBase>> Visitors { get; } = new();
    private Visitor.Visit<TBase> Default { get; set; } = default!;

    public void Register<T>(Visitor.Visit<TBase> visitor)
    {
        Visitors[typeof(T)] = visitor;
    }

    public Visitor.Visit<TBase> this[Type type] => Visitors.GetValueOrDefault(type, Default);
}

public class VisitorContainer<TBase, TContext>
{
    private Dictionary<Type, Visitor.Visit<TBase, TContext>> Visitors { get; } = new();
    private Visitor.Visit<TBase, TContext> Default { get; set; } = default!;

    public void Register<T>(Visitor.Visit<TBase, TContext> visitor)
    {
        Visitors[typeof(T)] = visitor;
    }

    public Visitor.Visit<TBase, TContext> this[Type type] => Visitors.GetValueOrDefault(type, Default);
}

public class VisitorContainer<TBase, TContext, TResult>
{
    private Dictionary<Type, Visitor.Visit<TBase, TContext, TResult>> Visitors { get; } = new();
    private Visitor.Visit<TBase, TContext, TResult> Default { get; set; } = default!;

    public void Register<T>(Visitor.Visit<TBase, TContext, TResult> visitor)
    {
        Visitors[typeof(T)] = visitor;
    }

    public Visitor.Visit<TBase, TContext, TResult> this[Type type] => Visitors.GetValueOrDefault(type, Default);
}