// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
using System.Collections.Generic;
 
namespace Microsoft.ML.Tokenizers
{
    internal static class IListExtensions
    {
        public static void AddRange<T>(this IList<T> list, IEnumerable<T> items)
        {
            if (list is List<T> concreteList)
            {
                concreteList.AddRange(items);
            }
            else if (items is IList<T> listToAdd)
            {
                int count = listToAdd.Count;
                for (int i = 0; i < count; i++)
                {
                    list.Add(listToAdd[i]);
                }
            }
            else
            {
                foreach (var item in items)
                {
                    list.Add(item);
                }
            }
        }
    }
}