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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;
using System.Collections.Immutable;
using System.ComponentModel.Composition;
using Microsoft.CodeAnalysis.Completion;
using Microsoft.CodeAnalysis.Host.Mef;
namespace Microsoft.CodeAnalysis.Editor.Implementation.IntelliSense.AsyncCompletion;
[Export]
internal class RecentItemsManager
{
private const int MaxMRUSize = 10;
/// <summary>
/// Guard for <see cref="RecentItems"/>
/// </summary>
private readonly object _mruUpdateLock = new();
[ImportingConstructor]
[Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
public RecentItemsManager()
{
}
private ImmutableArray<string> RecentItems { get; set; } = [];
public void MakeMostRecentItem(CompletionItem item)
{
lock (_mruUpdateLock)
{
var items = RecentItems;
items = items.Remove(item.FilterText);
if (items.Length == MaxMRUSize)
{
// Remove the least recent item.
items = items.RemoveAt(0);
}
RecentItems = items.Add(item.FilterText);
}
}
public int GetRecentItemIndex(CompletionItem item)
{
return RecentItems.IndexOf(item.FilterText);
}
}
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