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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.Collections.Immutable;
using System.Composition;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Diagnostics;
using Microsoft.CodeAnalysis.Formatting;
using Microsoft.CodeAnalysis.Options;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Simplification;
using Microsoft.CodeAnalysis.Text;
using Roslyn.Utilities;
using Microsoft.CodeAnalysis;
using MonoDevelop.CSharp.Diagnostics;
using ICSharpCode.NRefactory6.CSharp;
using MonoDevelop.Core;
using System;
using Microsoft.CodeAnalysis.CSharp;
using ICSharpCode.NRefactory6.CSharp.Refactoring;
using MonoDevelop.CSharp.Diagnostics.SimplifyTypeNames;
namespace MonoDevelop.CSharp.CodeFixes.SimplifyTypeNames
{
[ExportCodeFixProvider(LanguageNames.CSharp, Name = PredefinedCodeFixProviderNames.SimplifyNames), Shared]
[ExtensionOrder(After = PredefinedCodeFixProviderNames.RemoveUnnecessaryCast)]
internal partial class SimplifyTypeNamesCodeFixProvider : CodeFixProvider
{
public sealed override ImmutableArray<string> FixableDiagnosticIds
{
get
{
return ImmutableArray.Create(
IDEDiagnosticIds.SimplifyNamesDiagnosticId,
IDEDiagnosticIds.SimplifyMemberAccessDiagnosticId,
IDEDiagnosticIds.SimplifyThisOrMeDiagnosticId);
}
}
// public sealed override FixAllProvider GetFixAllProvider()
// {
// return SimplifyTypeNamesFixAllProvider.Instance;
// }
internal static SyntaxNode GetNodeToSimplify(SyntaxNode root, SemanticModel model, TextSpan span, OptionSet optionSet, out string diagnosticId, CancellationToken cancellationToken)
{
diagnosticId = null;
var token = root.FindToken(span.Start, findInsideTrivia: true);
if (!token.Span.IntersectsWith(span))
{
return null;
}
foreach (var n in token.GetAncestors<SyntaxNode>())
{
if (n.Span.IntersectsWith(span) && CanSimplifyTypeNameExpression(model, n, optionSet, span, out diagnosticId, cancellationToken))
{
return n;
}
}
return null;
}
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 optionSet = document.Project.Solution.Workspace.Options;
string diagnosticId;
var node = GetNodeToSimplify(root, model, span, optionSet, out diagnosticId, cancellationToken);
if (node == null)
{
return;
}
var id = GetCodeActionId(diagnosticId, node.ToString());
var title = id;
var codeAction = new DocumentChangeAction(node.Span, DiagnosticSeverity.Warning, title,
(c) => SimplifyTypeNameAsync(document, node, c));
context.RegisterCodeFix(codeAction, context.Diagnostics);
}
// internal for testing purpose
internal static string GetCodeActionId(string diagnosticId, string nodeText)
{
switch (diagnosticId)
{
case IDEDiagnosticIds.SimplifyNamesDiagnosticId:
return string.Format(GettextCatalog.GetString ("Simplify name '{0}'"), nodeText);
case IDEDiagnosticIds.SimplifyMemberAccessDiagnosticId:
return string.Format(GettextCatalog.GetString ("Simplify member access '{0}'"), nodeText);
case IDEDiagnosticIds.SimplifyThisOrMeDiagnosticId:
return GettextCatalog.GetString ("Remove 'this' qualification");
default:
throw new InvalidOperationException();
}
}
private static bool CanSimplifyTypeNameExpression(SemanticModel model, SyntaxNode node, OptionSet optionSet, TextSpan span, out string diagnosticId, CancellationToken cancellationToken)
{
diagnosticId = null;
TextSpan issueSpan;
if (!CSharpSimplifyTypeNamesDiagnosticAnalyzer.IsCandidate(node) ||
!CSharpSimplifyTypeNamesDiagnosticAnalyzer.CanSimplifyTypeNameExpression(model, node, optionSet, out issueSpan, out diagnosticId, cancellationToken))
{
return false;
}
return issueSpan.Equals(span);
}
private async Task<Document> SimplifyTypeNameAsync(Document document, SyntaxNode node, CancellationToken cancellationToken)
{
var expressionSyntax = node;
var annotatedexpressionSyntax = expressionSyntax.WithAdditionalAnnotations(Simplifier.Annotation, Formatter.Annotation);
if (annotatedexpressionSyntax.Kind() == SyntaxKind.IsExpression || annotatedexpressionSyntax.Kind() == SyntaxKind.AsExpression)
{
var right = ((BinaryExpressionSyntax)annotatedexpressionSyntax).Right;
annotatedexpressionSyntax = annotatedexpressionSyntax.ReplaceNode(right, right.WithAdditionalAnnotations(Simplifier.Annotation));
}
SyntaxNode oldNode = expressionSyntax;
SyntaxNode newNode = annotatedexpressionSyntax;
var root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var newRoot = root.ReplaceNode(oldNode, newNode);
return document.WithSyntaxRoot(newRoot);
}
}
}
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