// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the MIT license.  See License.txt in the project root for license information.
 
#if CODEANALYSIS_V3_OR_BETTER
 
using System;
using System.IO;
 
namespace Analyzer.Utilities
{
    internal static class PathHelper
    {
        private static readonly char[] DirectorySeparatorCharacters = { Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar };
 
        public static ReadOnlySpan<char> GetFileName(string? path)
        {
            if (RoslynString.IsNullOrEmpty(path))
                return ReadOnlySpan<char>.Empty;
 
            var lastSeparator = path.LastIndexOfAny(DirectorySeparatorCharacters);
            if (lastSeparator < 0)
                return path.AsSpan();
 
            return path.AsSpan()[(lastSeparator + 1)..];
        }
    }
}
 
#endif