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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.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.LanguageServer;
using Microsoft.CodeAnalysis.LanguageServer.Handler;
using Microsoft.CodeAnalysis.PooledObjects;
using Roslyn.LanguageServer.Protocol;
using Microsoft.VisualStudio.LanguageServices.Xaml.Features.Formatting;
namespace Microsoft.VisualStudio.LanguageServices.Xaml.LanguageServer.Handler
{
[ExportStatelessXamlLspService(typeof(FormatDocumentOnTypeHandler)), Shared]
[Method(Methods.TextDocumentOnTypeFormattingName)]
internal class FormatDocumentOnTypeHandler : ILspServiceRequestHandler<DocumentOnTypeFormattingParams, TextEdit[]>
{
[ImportingConstructor]
[Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
public FormatDocumentOnTypeHandler()
{
}
public bool MutatesSolutionState => false;
public bool RequiresLSPSolution => true;
public TextDocumentIdentifier GetTextDocumentIdentifier(DocumentOnTypeFormattingParams request) => request.TextDocument;
public async Task<TextEdit[]> HandleRequestAsync(DocumentOnTypeFormattingParams request, RequestContext context, CancellationToken cancellationToken)
{
if (string.IsNullOrEmpty(request.Character))
{
return [];
}
using var _ = ArrayBuilder<TextEdit>.GetInstance(out var edits);
var document = context.Document;
var formattingService = document?.Project.Services.GetService<IXamlFormattingService>();
if (document != null && formattingService != null)
{
var position = await document.GetPositionFromLinePositionAsync(ProtocolConversions.PositionToLinePosition(request.Position), cancellationToken).ConfigureAwait(false);
var options = new XamlFormattingOptions { InsertSpaces = request.Options.InsertSpaces, TabSize = request.Options.TabSize, OtherOptions = request.Options.OtherOptions?.AsUntyped() };
var textChanges = await formattingService.GetFormattingChangesAsync(document, options, request.Character[0], position, cancellationToken).ConfigureAwait(false);
if (textChanges != null)
{
var text = await document.GetValueTextAsync(cancellationToken).ConfigureAwait(false);
edits.AddRange(textChanges.Select(change => ProtocolConversions.TextChangeToTextEdit(change, text)));
}
}
return edits.ToArray();
}
}
}
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