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// 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;
namespace Microsoft.CodeAnalysis.Diagnostics
{
/// <summary>
/// Place this attribute onto a type to cause it to be considered a diagnostic analyzer.
/// </summary>
[AttributeUsage(AttributeTargets.Class)]
public sealed class DiagnosticAnalyzerAttribute : Attribute
{
/// <summary>
/// The source languages to which this analyzer applies. See <see cref="LanguageNames"/>.
/// </summary>
public string[] Languages { get; }
/// <summary>
/// Attribute constructor used to specify automatic application of a diagnostic analyzer.
/// </summary>
/// <param name="firstLanguage">One language to which the analyzer applies.</param>
/// <param name="additionalLanguages">Additional languages to which the analyzer applies. See <see cref="LanguageNames"/>.</param>
public DiagnosticAnalyzerAttribute(string firstLanguage, params string[] additionalLanguages)
{
if (firstLanguage == null)
{
throw new ArgumentNullException(nameof(firstLanguage));
}
if (additionalLanguages == null)
{
throw new ArgumentNullException(nameof(additionalLanguages));
}
var languages = new string[additionalLanguages.Length + 1];
languages[0] = firstLanguage;
for (int index = 0; index < additionalLanguages.Length; index++)
{
languages[index + 1] = additionalLanguages[index];
}
this.Languages = languages;
}
}
}
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