// 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.
 
#nullable disable
 
using System.Runtime.CompilerServices;
 
namespace Microsoft.CodeAnalysis.CodeGeneration;
 
internal sealed class CodeGenerationEventInfo
{
    private static readonly ConditionalWeakTable<IEventSymbol, CodeGenerationEventInfo> s_eventToInfoMap = new();
 
    private readonly bool _isUnsafe;
    private CodeGenerationEventInfo(bool isUnsafe)
        => _isUnsafe = isUnsafe;
 
    public static void Attach(IEventSymbol @event, bool isUnsafe)
    {
        var info = new CodeGenerationEventInfo(isUnsafe);
        s_eventToInfoMap.Add(@event, info);
    }
 
    private static CodeGenerationEventInfo GetInfo(IEventSymbol @event)
    {
        s_eventToInfoMap.TryGetValue(@event, out var info);
        return info;
    }
 
    public static bool GetIsUnsafe(IEventSymbol @event)
        => GetIsUnsafe(GetInfo(@event));
 
    private static bool GetIsUnsafe(CodeGenerationEventInfo info)
        => info != null && info._isUnsafe;
}