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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.CodeActions;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.CSharp.Extensions;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Diagnostics;
using Microsoft.CodeAnalysis.Formatting;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Simplification;
using Microsoft.CodeAnalysis.Text;
using Microsoft.CodeAnalysis;
using MonoDevelop.CSharp.Diagnostics;
using ICSharpCode.NRefactory6.CSharp;
using MonoDevelop.Core;
using ICSharpCode.NRefactory6.CSharp.Refactoring;
using Microsoft.CodeAnalysis.CSharp;
namespace MonoDevelop.CSharp.CodeFixes.RemoveUnnecessaryCast
{
[ExportCodeFixProvider(LanguageNames.CSharp, Name = PredefinedCodeFixProviderNames.RemoveUnnecessaryCast), Shared]
[ExtensionOrder(After = PredefinedCodeFixProviderNames.ImplementInterface)]
internal partial class RemoveUnnecessaryCastCodeFixProvider : CodeFixProvider
{
public sealed override ImmutableArray<string> FixableDiagnosticIds
{
get { return ImmutableArray.Create(IDEDiagnosticIds.RemoveUnnecessaryCastDiagnosticId); }
}
// public sealed override FixAllProvider GetFixAllProvider()
// {
// return RemoveUnnecessaryCastFixAllProvider.Instance;
// }
//
private static CastExpressionSyntax GetCastNode(SyntaxNode root, SemanticModel model, TextSpan span, CancellationToken cancellationToken)
{
var token = root.FindToken(span.Start);
if (!token.Span.IntersectsWith(span))
{
return null;
}
return token.GetAncestors<CastExpressionSyntax>()
.FirstOrDefault(c => c.Span.IntersectsWith(span) && c.IsUnnecessaryCast(model, cancellationToken));
}
public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
var document = context.Document;
var span = context.Span;
var cancellationToken = context.CancellationToken;
var root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var model = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
var node = GetCastNode(root, model, span, cancellationToken);
if (node == null)
{
return;
}
context.RegisterCodeFix(
new DocumentChangeAction(node.Span, DiagnosticSeverity.Warning,
GettextCatalog.GetString ("Remove Unnecessary Cast"),
(c) => RemoveUnnecessaryCastAsync(document, node, c)),
context.Diagnostics);
}
private static async Task<Document> RemoveUnnecessaryCastAsync(Document document, CastExpressionSyntax cast, CancellationToken cancellationToken)
{
var annotatedCast = cast.WithAdditionalAnnotations(Simplifier.Annotation);
if (annotatedCast.Expression is ParenthesizedExpressionSyntax)
{
annotatedCast = annotatedCast.WithExpression(
annotatedCast.Expression.WithAdditionalAnnotations(Simplifier.Annotation));
}
else
{
annotatedCast = annotatedCast.WithExpression(
annotatedCast.Expression.Parenthesize());
}
ExpressionSyntax oldNode = cast;
ExpressionSyntax newNode = annotatedCast;
// Ensure that we simplify any parenting parenthesized expressions not just on the syntax tree level but also on Token based
// Case 1:
// In the syntax, (((Task<Action>)x).Result)()
// oldNode = (Task<Action>)x
// newNode = (Task<Action>)(x)
// Final newNode will be (((Task<Action>)(x)).Result)
while (oldNode.Parent.IsKind(SyntaxKind.ParenthesizedExpression) || oldNode.GetFirstToken().GetPreviousToken().Parent.IsKind(SyntaxKind.ParenthesizedExpression))
{
var parenthesizedExpression = (ParenthesizedExpressionSyntax)oldNode.GetFirstToken().GetPreviousToken().Parent;
newNode = parenthesizedExpression.ReplaceNode(oldNode, newNode)
.WithAdditionalAnnotations(Simplifier.Annotation);
oldNode = parenthesizedExpression;
}
newNode = newNode.WithAdditionalAnnotations(Formatter.Annotation);
var root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var newRoot = root.ReplaceNode(oldNode, newNode);
return document.WithSyntaxRoot(newRoot);
}
//
// private class MyCodeAction : CodeAction.DocumentChangeAction
// {
// public MyCodeAction(string title, Func<CancellationToken, Task<Document>> createChangedDocument) :
// base(title, createChangedDocument)
// {
// }
// }
}
}
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