// 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.
 
namespace Microsoft.CodeAnalysis.CSharp
{
    internal partial class BoundCollectionExpressionBase
    {
        /// <summary>
        /// Returns true if the collection expression contains any spreads.
        /// </summary>
        /// <param name="numberIncludingLastSpread">The number of elements up to and including the
        /// last spread element. If the length of the collection expression is known, this is the number
        /// of elements evaluated before any are added to the collection instance in lowering.</param>
        /// <param name="hasKnownLength">True if all the spread elements are countable.</param>
        internal bool HasSpreadElements(out int numberIncludingLastSpread, out bool hasKnownLength)
        {
            hasKnownLength = true;
            numberIncludingLastSpread = 0;
            for (int i = 0; i < Elements.Length; i++)
            {
                if (Elements[i] is BoundCollectionExpressionSpreadElement spreadElement)
                {
                    numberIncludingLastSpread = i + 1;
                    if (spreadElement.LengthOrCount is null)
                    {
                        hasKnownLength = false;
                    }
                }
            }
            return numberIncludingLastSpread > 0;
        }
 
        public new bool IsParamsArrayOrCollection
        {
            get
            {
                return base.IsParamsArrayOrCollection;
            }
            init
            {
                base.IsParamsArrayOrCollection = value;
            }
        }
    }
}