// 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 Microsoft.CodeAnalysis.Formatting.Rules;
using Roslyn.Utilities;
 
namespace Microsoft.CodeAnalysis.Formatting
{
    /// <summary>
    /// it holds onto space and wrapping operation need to run between two tokens.
    /// </summary>
    internal readonly struct TokenPairWithOperations
    {
        public TokenStream TokenStream { get; }
        public AdjustSpacesOperation? SpaceOperation { get; }
        public AdjustNewLinesOperation? LineOperation { get; }
 
        public int PairIndex { get; }
 
        public TokenPairWithOperations(
            TokenStream tokenStream,
            int tokenPairIndex,
            AdjustSpacesOperation? spaceOperations,
            AdjustNewLinesOperation? lineOperations)
            : this()
        {
            Contract.ThrowIfNull(tokenStream);
 
            Contract.ThrowIfFalse(0 <= tokenPairIndex && tokenPairIndex < tokenStream.TokenCount - 1);
 
            this.TokenStream = tokenStream;
            this.PairIndex = tokenPairIndex;
 
            SpaceOperation = spaceOperations;
            LineOperation = lineOperations;
        }
 
        public SyntaxToken Token1
        {
            get
            {
                return this.TokenStream.GetToken(this.PairIndex);
            }
        }
 
        public SyntaxToken Token2
        {
            get
            {
                return this.TokenStream.GetToken(this.PairIndex + 1);
            }
        }
    }
}