// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

#nullable disable

using System;

namespace Microsoft.AspNetCore.Razor.Hosting;

/// <summary>
/// Specifies the name of a Razor configuration as defined by the Razor SDK.
/// </summary>
/// <remarks>
/// This attribute is part of a set of metadata attributes that can be applied to an assembly at build
/// time by the Razor SDK. These attributes allow the Razor configuration to be loaded at runtime based
/// on the settings originally provided by the project file.
/// </remarks>
[AttributeUsage(AttributeTargets.Assembly, AllowMultiple = false, Inherited = false)]
public sealed class RazorLanguageVersionAttribute : Attribute
{
    /// <summary>
    /// Creates a new instance of <see cref="RazorLanguageVersionAttribute"/>.
    /// </summary>
    /// <param name="languageVersion">The language version of Razor</param>
    public RazorLanguageVersionAttribute(string languageVersion)
    {
        if (languageVersion == null)
        {
            throw new ArgumentNullException(nameof(languageVersion));
        }

        LanguageVersion = languageVersion;
    }

    /// <summary>
    /// Gets the Razor language version.
    /// </summary>
    public string LanguageVersion { get; }
}
