// 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.Text;
 
namespace Microsoft.CodeAnalysis.EmbeddedLanguages.VirtualChars
{
    internal abstract partial class AbstractVirtualCharService
    {
        /// <summary>
        /// Abstraction to allow generic algorithms to run over a string or <see cref="SourceText"/> without any
        /// overhead.
        /// </summary>
        private interface ITextInfo<T>
        {
            char Get(T text, int index);
            int Length(T text);
        }
 
        private struct SourceTextTextInfo : ITextInfo<SourceText>
        {
            public readonly char Get(SourceText text, int index) => text[index];
            public readonly int Length(SourceText text) => text.Length;
        }
 
        private struct StringTextInfo : ITextInfo<string>
        {
            public readonly char Get(string text, int index) => text[index];
            public readonly int Length(string text) => text.Length;
        }
    }
}