// 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.
 
#nullable disable
 
using System;
using System.Collections.Generic;
using Microsoft.CodeAnalysis.CSharp.Syntax;
 
namespace Microsoft.CodeAnalysis.CSharp.Extensions
{
    internal static partial class DirectiveSyntaxExtensions
    {
        private class DirectiveInfo
        {
            // Maps a directive to its pair
            public IDictionary<DirectiveTriviaSyntax, DirectiveTriviaSyntax> DirectiveMap { get; }
 
            // Maps a #If/#elif/#else/#endIf directive to its list of matching #If/#elif/#else/#endIf directives
            public IDictionary<DirectiveTriviaSyntax, IReadOnlyList<DirectiveTriviaSyntax>> ConditionalMap { get; }
 
            // A set of inactive regions spans.  The items in the tuple are the start and end line
            // *both inclusive* of the inactive region. Actual PP lines are not continued within.
            //
            // Note: an interval tree might be a better structure here if there are lots of inactive
            // regions.  Consider switching to that if necessary.
            public ISet<Tuple<int, int>> InactiveRegionLines { get; }
 
            public DirectiveInfo(
                IDictionary<DirectiveTriviaSyntax, DirectiveTriviaSyntax> directiveMap,
                IDictionary<DirectiveTriviaSyntax, IReadOnlyList<DirectiveTriviaSyntax>> conditionalMap,
                ISet<Tuple<int, int>> inactiveRegionLines)
            {
                this.DirectiveMap = directiveMap;
                this.ConditionalMap = conditionalMap;
                this.InactiveRegionLines = inactiveRegionLines;
            }
        }
    }
}