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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.CSharp.Extensions;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.LanguageService;
using Microsoft.CodeAnalysis.SignatureHelp;
using Microsoft.CodeAnalysis.Text;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis.CSharp.SignatureHelp;
[ExportSignatureHelpProvider("GenericNamePartiallyWrittenSignatureHelpProvider", LanguageNames.CSharp), Shared]
internal class GenericNamePartiallyWrittenSignatureHelpProvider : GenericNameSignatureHelpProvider
{
[ImportingConstructor]
[Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
public GenericNamePartiallyWrittenSignatureHelpProvider()
{
}
protected override bool TryGetGenericIdentifier(SyntaxNode root, int position, ISyntaxFactsService syntaxFacts, SignatureHelpTriggerReason triggerReason, CancellationToken cancellationToken, out SyntaxToken genericIdentifier, out SyntaxToken lessThanToken)
=> root.SyntaxTree.IsInPartiallyWrittenGeneric(position, cancellationToken, out genericIdentifier, out lessThanToken);
protected override TextSpan GetTextSpan(SyntaxToken genericIdentifier, SyntaxToken lessThanToken)
{
var lastToken = genericIdentifier.FindLastTokenOfPartialGenericName();
var nextToken = lastToken.GetNextNonZeroWidthTokenOrEndOfFile();
Contract.ThrowIfTrue(nextToken.Kind() == 0);
return TextSpan.FromBounds(genericIdentifier.SpanStart, nextToken.SpanStart);
}
}
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