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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.Composition;
using System.Threading;
using Microsoft.CodeAnalysis.Completion;
using Microsoft.CodeAnalysis.CSharp.Completion.Providers;
using Microsoft.CodeAnalysis.Host;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.Shared.TestHooks;
using Microsoft.CodeAnalysis.Text;
namespace Microsoft.CodeAnalysis.CSharp.Completion;
internal sealed class CSharpCompletionService : CommonCompletionService
{
[ExportLanguageServiceFactory(typeof(CompletionService), LanguageNames.CSharp), Shared]
[method: ImportingConstructor]
[method: Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
internal sealed class Factory(IAsynchronousOperationListenerProvider listenerProvider) : ILanguageServiceFactory
{
private readonly IAsynchronousOperationListenerProvider _listenerProvider = listenerProvider;
[Obsolete(MefConstruction.FactoryMethodMessage, error: true)]
public ILanguageService CreateLanguageService(HostLanguageServices languageServices)
=> new CSharpCompletionService(languageServices.LanguageServices.SolutionServices, _listenerProvider);
}
private CompletionRules _latestRules = CompletionRules.Default;
private CSharpCompletionService(SolutionServices services, IAsynchronousOperationListenerProvider listenerProvider)
: base(services, listenerProvider)
{
}
public override string Language => LanguageNames.CSharp;
public override TextSpan GetDefaultCompletionListSpan(SourceText text, int caretPosition)
=> CompletionUtilities.GetCompletionItemSpan(text, caretPosition);
internal override CompletionRules GetRules(CompletionOptions options)
{
var enterRule = options.EnterKeyBehavior;
var snippetRule = options.SnippetsBehavior;
// Although EnterKeyBehavior is a per-language setting, the meaning of an unset setting (Default) differs between C# and VB
// In C# the default means Never to maintain previous behavior
if (enterRule == EnterKeyRule.Default)
{
enterRule = EnterKeyRule.Never;
}
if (snippetRule == SnippetsRule.Default)
{
snippetRule = SnippetsRule.AlwaysInclude;
}
// use interlocked + stored rules to reduce # of times this gets created when option is different than default
var newRules = _latestRules.WithDefaultEnterKeyRule(enterRule)
.WithSnippetsRule(snippetRule);
Interlocked.Exchange(ref _latestRules, newRules);
return newRules;
}
}
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