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GeneratorAttribute.cs
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GeneratorAttribute.cs
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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
{
/// <summary>
/// Place this attribute onto a type to cause it to be considered a source generator
/// </summary>
[AttributeUsage(AttributeTargets.Class)]
public sealed class GeneratorAttribute : Attribute
{
/// <summary>
/// The source languages to which this generator applies. See <see cref="LanguageNames"/>.
/// </summary>
public string[] Languages { get; }
/// <summary>
/// Attribute constructor used to specify the attached class is a source generator that provides CSharp sources.
/// </summary>
public GeneratorAttribute()
: this(LanguageNames.CSharp) { }
/// <summary>
/// Attribute constructor used to specify the attached class is a source generator and indicate which language(s) it supports.
/// </summary>
/// <param name="firstLanguage">One language to which the generator applies.</param>
/// <param name="additionalLanguages">Additional languages to which the generator applies. See <see cref="LanguageNames"/>.</param>
public GeneratorAttribute(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;
}
}
}