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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.Composition;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Completion;
using Microsoft.CodeAnalysis.Completion.Providers;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.Text;
namespace Microsoft.CodeAnalysis.CSharp.Completion.Providers;
[ExportCompletionProvider(nameof(ExtensionMethodImportCompletionProvider), LanguageNames.CSharp)]
[ExtensionOrder(After = nameof(TypeImportCompletionProvider))]
[Shared]
internal sealed class ExtensionMethodImportCompletionProvider : AbstractExtensionMethodImportCompletionProvider
{
[ImportingConstructor]
[Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
public ExtensionMethodImportCompletionProvider()
{
}
internal override string Language => LanguageNames.CSharp;
protected override string GenericSuffix => "<>";
public override bool IsInsertionTrigger(SourceText text, int characterPosition, CompletionOptions options)
=> CompletionUtilities.IsTriggerCharacter(text, characterPosition, options);
public override ImmutableHashSet<char> TriggerCharacters { get; } = CompletionUtilities.CommonTriggerCharacters;
protected override bool IsFinalSemicolonOfUsingOrExtern(SyntaxNode directive, SyntaxToken token)
{
if (token.IsKind(SyntaxKind.None) || token.IsMissing)
return false;
return directive switch
{
UsingDirectiveSyntax usingDirective => usingDirective.SemicolonToken == token,
ExternAliasDirectiveSyntax externAliasDirective => externAliasDirective.SemicolonToken == token,
_ => false,
};
}
protected override Task<bool> ShouldProvideParenthesisCompletionAsync(
Document document,
CompletionItem item,
char? commitKey,
CancellationToken cancellationToken)
// Ideally we should check if the inferred type for this location is delegate to decide whether to add parenthesis or not
// However, for an extension method like
// static class C { public static int ToInt(this Bar b) => 1; }
// it can only be used as like: bar.ToInt();
// Func<int> x = bar.ToInt or Func<Bar, int> x = bar.ToInt is illegal. It can't be assign to delegate.
// Therefore at here we always assume the user always wants to add parenthesis.
=> Task.FromResult(commitKey is ';' or '.');
}
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