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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.Generic;
using System.Collections.Immutable;
using System.Composition;
using System.Diagnostics;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.Diagnostics;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.PooledObjects;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Text;
namespace Microsoft.CodeAnalysis.CSharp.NewLines.ConsecutiveBracePlacement;
[ExportCodeFixProvider(LanguageNames.CSharp, Name = PredefinedCodeFixProviderNames.ConsecutiveBracePlacement), Shared]
[method: ImportingConstructor]
[method: Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
internal sealed class ConsecutiveBracePlacementCodeFixProvider() : CodeFixProvider
{
public override ImmutableArray<string> FixableDiagnosticIds
=> [IDEDiagnosticIds.ConsecutiveBracePlacementDiagnosticId];
public override Task RegisterCodeFixesAsync(CodeFixContext context)
{
var document = context.Document;
var diagnostic = context.Diagnostics.First();
context.RegisterCodeFix(
CodeAction.Create(
CSharpCodeFixesResources.Remove_blank_lines_between_braces,
c => UpdateDocumentAsync(document, diagnostic, c),
nameof(CSharpCodeFixesResources.Remove_blank_lines_between_braces)),
context.Diagnostics);
return Task.CompletedTask;
}
private static Task<Document> UpdateDocumentAsync(Document document, Diagnostic diagnostic, CancellationToken cancellationToken)
=> FixAllAsync(document, [diagnostic], cancellationToken);
public static async Task<Document> FixAllAsync(Document document, ImmutableArray<Diagnostic> diagnostics, CancellationToken cancellationToken)
{
var text = await document.GetValueTextAsync(cancellationToken).ConfigureAwait(false);
var root = await document.GetRequiredSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
using var _ = PooledDictionary<SyntaxToken, SyntaxToken>.GetInstance(out var tokenToToken);
foreach (var diagnostic in diagnostics)
FixOne(root, text, tokenToToken, diagnostic, cancellationToken);
var newRoot = root.ReplaceTokens(tokenToToken.Keys, (t1, _) => tokenToToken[t1]);
return document.WithSyntaxRoot(newRoot);
}
private static void FixOne(
SyntaxNode root, SourceText text,
Dictionary<SyntaxToken, SyntaxToken> tokenToToken,
Diagnostic diagnostic, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
var token = root.FindToken(diagnostic.Location.SourceSpan.Start);
if (!token.IsKind(SyntaxKind.CloseBraceToken))
{
Debug.Fail("Could not find close brace in fixer");
return;
}
var firstBrace = token.GetPreviousToken();
if (!firstBrace.IsKind(SyntaxKind.CloseBraceToken))
{
Debug.Fail("Could not find previous close brace in fixer");
return;
}
if (!ConsecutiveBracePlacementDiagnosticAnalyzer.HasExcessBlankLinesAfter(
text, firstBrace, out var secondBrace, out var lastEndOfLineTrivia))
{
Debug.Fail("Could not match analyzer pattern");
return;
}
var updatedSecondBrace = secondBrace.WithLeadingTrivia(
secondBrace.LeadingTrivia.SkipWhile(t => t != lastEndOfLineTrivia).Skip(1));
tokenToToken[secondBrace] = updatedSecondBrace;
}
public override FixAllProvider GetFixAllProvider()
=> FixAllProvider.Create(async (context, document, diagnostics) => await FixAllAsync(document, diagnostics, context.CancellationToken).ConfigureAwait(false));
}
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