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// Copyright (c) Microsoft. All Rights Reserved. Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Collections.Immutable;
using System.Composition;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.CodeActions;
using ICSharpCode.NRefactory6.CSharp.Refactoring;
using MonoDevelop.CSharp.CodeFixes;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using MonoDevelop.Core;
namespace MonoDevelop.CSharp.CodeFixes
{
internal abstract partial class AbstractChangeToAsyncCodeFixProvider : AbstractAsyncCodeFix
{
protected abstract Task<string> GetDescription(Diagnostic diagnostic, SyntaxNode node, SemanticModel semanticModel, CancellationToken cancellationToken);
protected abstract Task<Tuple<SyntaxTree, SyntaxNode>> GetRootInOtherSyntaxTree(SyntaxNode node, SemanticModel semanticModel, Diagnostic diagnostic, CancellationToken cancellationToken);
protected override async Task<CodeAction> GetCodeFix(SyntaxNode root, SyntaxNode node, Document document, Diagnostic diagnostic, CancellationToken cancellationToken)
{
var semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
var result = await GetRootInOtherSyntaxTree(node, semanticModel, diagnostic, cancellationToken).ConfigureAwait(false);
if (result != null)
{
var syntaxTree = result.Item1;
var newRoot = result.Item2;
var otherDocument = document.Project.Solution.GetDocument(syntaxTree);
return new DocumentChangeAction(node.Span, DiagnosticSeverity.Error,
await this.GetDescription(diagnostic, node, semanticModel, cancellationToken).ConfigureAwait(false),
token => Task.FromResult(otherDocument.WithSyntaxRoot(newRoot)));
}
return null;
}
}
[ExportCodeFixProvider(LanguageNames.CSharp, Name = PredefinedCodeFixProviderNames.ConvertToAsync), Shared]
internal class CSharpConvertToAsyncMethodCodeFixProvider : AbstractChangeToAsyncCodeFixProvider
{
/// <summary>
/// Cannot await void.
/// </summary>
private const string CS4008 = "CS4008";
public override ImmutableArray<string> FixableDiagnosticIds
{
get { return ImmutableArray.Create(CS4008); }
}
protected override async Task<string> GetDescription(
Diagnostic diagnostic,
SyntaxNode node,
SemanticModel semanticModel,
CancellationToken cancellationToken)
{
var methodNode = await GetMethodDeclaration(node, semanticModel, cancellationToken).ConfigureAwait(false);
return string.Format(GettextCatalog.GetString ("Make {0} return Task instead of void"), methodNode.WithBody(null));
}
protected override async Task<Tuple<SyntaxTree, SyntaxNode>> GetRootInOtherSyntaxTree(
SyntaxNode node,
SemanticModel semanticModel,
Diagnostic diagnostic,
CancellationToken cancellationToken)
{
var methodDeclaration = await GetMethodDeclaration(node, semanticModel, cancellationToken).ConfigureAwait(false);
if (methodDeclaration == null)
{
return null;
}
var oldRoot = await methodDeclaration.SyntaxTree.GetRootAsync(cancellationToken).ConfigureAwait(false);
var newRoot = oldRoot.ReplaceNode(methodDeclaration, ConvertToAsyncFunction(methodDeclaration));
return Tuple.Create(oldRoot.SyntaxTree, newRoot);
}
private async Task<MethodDeclarationSyntax> GetMethodDeclaration(
SyntaxNode node,
SemanticModel semanticModel,
CancellationToken cancellationToken)
{
var invocationExpression = node.ChildNodes().FirstOrDefault(n => n.IsKind(SyntaxKind.InvocationExpression));
var methodSymbol = semanticModel.GetSymbolInfo(invocationExpression, cancellationToken).Symbol as IMethodSymbol;
if (methodSymbol == null)
{
return null;
}
var methodReference = methodSymbol.DeclaringSyntaxReferences.FirstOrDefault();
if (methodReference == null)
{
return null;
}
var methodDeclaration = (await methodReference.GetSyntaxAsync(cancellationToken).ConfigureAwait(false)) as MethodDeclarationSyntax;
if (methodDeclaration == null)
{
return null;
}
if (!methodDeclaration.Modifiers.Any(m => m.IsKind(SyntaxKind.AsyncKeyword)))
{
return null;
}
return methodDeclaration;
}
private MethodDeclarationSyntax ConvertToAsyncFunction(MethodDeclarationSyntax methodDeclaration)
{
return methodDeclaration.WithReturnType(
SyntaxFactory.ParseTypeName("Task")
.WithLeadingTrivia(methodDeclaration.ReturnType.GetLeadingTrivia())
.WithTrailingTrivia(methodDeclaration.ReturnType.GetTrailingTrivia()));
}
}
}
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