// 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.Diagnostics.CodeAnalysis;
using System.Threading;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Text;
 
namespace Analyzer.Utilities.Extensions
{
    internal static class SyntaxTreeExtensions
    {
        public static bool OverlapsHiddenPosition([NotNullWhen(returnValue: true)] this SyntaxTree? tree, TextSpan span, CancellationToken cancellationToken)
        {
            if (tree == null)
            {
                return false;
            }
 
            var text = tree.GetText(cancellationToken);
 
            return text.OverlapsHiddenPosition(
                span,
                (position, cancellationToken2) =>
                {
                    // implements the ASP.NET IsHidden rule
                    var lineVisibility = tree.GetLineVisibility(position, cancellationToken2);
                    return lineVisibility is LineVisibility.Hidden or LineVisibility.BeforeFirstLineDirective;
                },
                cancellationToken);
        }
    }
}