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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.
#nullable disable
using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Text;
namespace Microsoft.CodeAnalysis.ConvertToAsync;
internal abstract partial class AbstractConvertToAsyncCodeFixProvider : CodeFixProvider
{
protected abstract Task<string> GetDescriptionAsync(Diagnostic diagnostic, SyntaxNode node, SemanticModel semanticModel, CancellationToken cancellationToken);
protected abstract Task<Tuple<SyntaxTree, SyntaxNode>> GetRootInOtherSyntaxTreeAsync(SyntaxNode node, SemanticModel semanticModel, Diagnostic diagnostic, CancellationToken cancellationToken);
public override FixAllProvider GetFixAllProvider()
{
// Fix All is not supported by this code fix
// https://github.com/dotnet/roslyn/issues/34463
return null;
}
public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
var root = await context.Document.GetSyntaxRootAsync(context.CancellationToken).ConfigureAwait(false);
if (!TryGetNode(root, context.Span, out var node))
{
return;
}
var diagnostic = context.Diagnostics.FirstOrDefault();
var codeAction = await GetCodeActionAsync(
node, context.Document, diagnostic, context.CancellationToken).ConfigureAwait(false);
if (codeAction != null)
{
context.RegisterCodeFix(codeAction, context.Diagnostics);
}
}
private static bool TryGetNode(SyntaxNode root, TextSpan span, out SyntaxNode node)
{
node = null;
var ancestors = root.FindToken(span.Start).GetAncestors<SyntaxNode>();
if (!ancestors.Any())
{
return false;
}
node = ancestors.FirstOrDefault(n => n.Span.Contains(span) && n != root);
return node != null;
}
private async Task<CodeAction> GetCodeActionAsync(
SyntaxNode node, Document document, Diagnostic diagnostic, CancellationToken cancellationToken)
{
var semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
var result = await GetRootInOtherSyntaxTreeAsync(node, semanticModel, diagnostic, cancellationToken).ConfigureAwait(false);
if (result == null)
return null;
var syntaxTree = result.Item1;
var newRoot = result.Item2;
var otherDocument = document.Project.Solution.GetDocument(syntaxTree);
var title = await GetDescriptionAsync(diagnostic, node, semanticModel, cancellationToken).ConfigureAwait(false);
return CodeAction.Create(
title,
token => Task.FromResult(otherDocument.WithSyntaxRoot(newRoot)),
title);
}
}
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