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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.CSharp;
using Microsoft.CodeAnalysis.Formatting;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.Indentation;
using Microsoft.CodeAnalysis.Options;
using Microsoft.CodeAnalysis.PooledObjects;
using Roslyn.LanguageServer.Protocol;
namespace Microsoft.CodeAnalysis.LanguageServer.Handler
{
[ExportCSharpVisualBasicStatelessLspService(typeof(FormatDocumentOnTypeHandler)), Shared]
[Method(Methods.TextDocumentOnTypeFormattingName)]
internal sealed class FormatDocumentOnTypeHandler : ILspServiceDocumentRequestHandler<DocumentOnTypeFormattingParams, TextEdit[]?>
{
private readonly IGlobalOptionService _globalOptions;
public bool MutatesSolutionState => false;
public bool RequiresLSPSolution => true;
[ImportingConstructor]
[Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
public FormatDocumentOnTypeHandler(IGlobalOptionService globalOptions)
{
_globalOptions = globalOptions;
}
public TextDocumentIdentifier GetTextDocumentIdentifier(DocumentOnTypeFormattingParams request) => request.TextDocument;
public async Task<TextEdit[]?> HandleRequestAsync(
DocumentOnTypeFormattingParams request,
RequestContext context,
CancellationToken cancellationToken)
{
var document = context.Document;
if (document is null)
return null;
var position = await document.GetPositionFromLinePositionAsync(ProtocolConversions.PositionToLinePosition(request.Position), cancellationToken).ConfigureAwait(false);
if (string.IsNullOrEmpty(request.Character) || SyntaxFacts.IsNewLine(request.Character[0]))
{
return [];
}
var formattingService = document.Project.Services.GetRequiredService<ISyntaxFormattingService>();
var documentSyntax = await ParsedDocument.CreateAsync(document, cancellationToken).ConfigureAwait(false);
if (!formattingService.ShouldFormatOnTypedCharacter(documentSyntax, request.Character[0], position, cancellationToken))
{
return [];
}
// We should use the options passed in by LSP instead of the document's options.
var formattingOptions = await ProtocolConversions.GetFormattingOptionsAsync(request.Options, document, cancellationToken).ConfigureAwait(false);
var indentationOptions = new IndentationOptions(formattingOptions)
{
AutoFormattingOptions = _globalOptions.GetAutoFormattingOptions(document.Project.Language)
};
var textChanges = formattingService.GetFormattingChangesOnTypedCharacter(documentSyntax, position, indentationOptions, cancellationToken);
if (textChanges.IsEmpty)
{
return [];
}
using var _ = ArrayBuilder<TextEdit>.GetInstance(out var edits);
edits.AddRange(textChanges.Select(change => ProtocolConversions.TextChangeToTextEdit(change, documentSyntax.Text)));
return edits.ToArray();
}
}
}
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