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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.Collections.Immutable;
using System.Composition;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeRefactorings;
using Microsoft.CodeAnalysis.CodeRefactorings.SyncNamespace;
using Microsoft.CodeAnalysis.CSharp.Extensions;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Text;
namespace Microsoft.CodeAnalysis.CSharp.CodeRefactorings.SyncNamespace;
[ExportCodeRefactoringProvider(LanguageNames.CSharp, Name = PredefinedCodeRefactoringProviderNames.SyncNamespace), Shared]
internal sealed class CSharpSyncNamespaceCodeRefactoringProvider
: AbstractSyncNamespaceCodeRefactoringProvider<BaseNamespaceDeclarationSyntax, CompilationUnitSyntax, MemberDeclarationSyntax>
{
[ImportingConstructor]
[SuppressMessage("RoslynDiagnosticsReliability", "RS0033:Importing constructor should be [Obsolete]", Justification = "Used in test code: https://github.com/dotnet/roslyn/issues/42814")]
public CSharpSyncNamespaceCodeRefactoringProvider()
{
}
protected override async Task<SyntaxNode?> TryGetApplicableInvocationNodeAsync(Document document, TextSpan span, CancellationToken cancellationToken)
{
if (!span.IsEmpty)
return null;
if (await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false) is not CompilationUnitSyntax compilationUnit)
return null;
var position = span.Start;
var namespaceDecls = compilationUnit.DescendantNodes(n => n is CompilationUnitSyntax or BaseNamespaceDeclarationSyntax)
.OfType<BaseNamespaceDeclarationSyntax>().ToImmutableArray();
if (namespaceDecls.Length == 1 && compilationUnit.Members.Count == 1)
{
var namespaceDeclaration = namespaceDecls[0];
if (namespaceDeclaration.Name.Span.IntersectsWith(position))
return namespaceDeclaration;
}
if (namespaceDecls.Length == 0)
{
var firstMemberDeclarationName = compilationUnit.Members.FirstOrDefault().GetNameToken();
if (firstMemberDeclarationName != default
&& firstMemberDeclarationName.Span.IntersectsWith(position))
{
return compilationUnit;
}
}
return null;
}
protected override string EscapeIdentifier(string identifier)
=> identifier.EscapeIdentifier();
}
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