// Copyright (c) Microsoft. All rights reserved.

// This is a copy of:
// https://github.com/dotnet/runtime/blob/main/src/libraries/System.Private.CoreLib/src/System/Diagnostics/CodeAnalysis/ExperimentalAttribute.cs
// made internal rather than public.

namespace System.Diagnostics.CodeAnalysis;

#if !NET8_0_OR_GREATER
/// <summary>
///  Indicates that an API is experimental and it may change in the future.
/// </summary>
/// <remarks>
///   This attribute allows call sites to be flagged with a diagnostic that indicates that an experimental
///   feature is used. Authors can use this attribute to ship preview features in their assemblies.
/// </remarks>
[AttributeUsage(AttributeTargets.Assembly |
                AttributeTargets.Module |
                AttributeTargets.Class |
                AttributeTargets.Struct |
                AttributeTargets.Enum |
                AttributeTargets.Constructor |
                AttributeTargets.Method |
                AttributeTargets.Property |
                AttributeTargets.Field |
                AttributeTargets.Event |
                AttributeTargets.Interface |
                AttributeTargets.Delegate, Inherited = false)]
internal sealed class ExperimentalAttribute : Attribute
{
    /// <summary>
    ///  Initializes a new instance of the <see cref="ExperimentalAttribute"/> class, specifying the ID that the compiler will use
    ///  when reporting a use of the API the attribute applies to.
    /// </summary>
    /// <param name="diagnosticId">The ID that the compiler will use when reporting a use of the API the attribute applies to.</param>
    public ExperimentalAttribute(string diagnosticId)
    {
        this.DiagnosticId = diagnosticId;
    }

    /// <summary>
    ///  Gets the ID that the compiler will use when reporting a use of the API the attribute applies to.
    /// </summary>
    /// <value>The unique diagnostic ID.</value>
    /// <remarks>
    ///  The diagnostic ID is shown in build output for warnings and errors.
    ///  <para>This property represents the unique ID that can be used to suppress the warnings or errors, if needed.</para>
    /// </remarks>
    public string DiagnosticId { get; }

    /// <summary>
    ///  Gets or sets the URL for corresponding documentation.
    ///  The API accepts a format string instead of an actual URL, creating a generic URL that includes the diagnostic ID.
    /// </summary>
    /// <value>The format string that represents a URL to corresponding documentation.</value>
    /// <remarks>An example format string is <c>https://contoso.com/obsoletion-warnings/{0}</c>.</remarks>
    public string? UrlFormat { get; set; }
}
#endif
