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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.Composition;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using Microsoft.CodeAnalysis.CodeRefactorings;
using Microsoft.CodeAnalysis.ConvertIfToSwitch;
using Microsoft.CodeAnalysis.CSharp.Extensions;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.LanguageService;
namespace Microsoft.CodeAnalysis.CSharp.ConvertIfToSwitch;
[ExportCodeRefactoringProvider(LanguageNames.CSharp, Name = PredefinedCodeRefactoringProviderNames.ConvertIfToSwitch), Shared]
[method: ImportingConstructor]
[method: SuppressMessage("RoslynDiagnosticsReliability", "RS0033:Importing constructor should be [Obsolete]", Justification = "Used in test code: https://github.com/dotnet/roslyn/issues/42814")]
internal sealed partial class CSharpConvertIfToSwitchCodeRefactoringProvider()
: AbstractConvertIfToSwitchCodeRefactoringProvider<IfStatementSyntax, ExpressionSyntax, BinaryExpressionSyntax, PatternSyntax>
{
public override string GetTitle(bool forSwitchExpression)
=> forSwitchExpression
? CSharpFeaturesResources.Convert_to_switch_expression
: CSharpFeaturesResources.Convert_to_switch_statement;
public override Analyzer CreateAnalyzer(ISyntaxFacts syntaxFacts, ParseOptions options)
{
var version = options.LanguageVersion();
var features =
(version >= LanguageVersion.CSharp7 ? Feature.SourcePattern | Feature.IsTypePattern | Feature.CaseGuard : 0) |
(version >= LanguageVersion.CSharp8 ? Feature.SwitchExpression : 0) |
(version >= LanguageVersion.CSharp9 ? Feature.RelationalPattern | Feature.OrPattern | Feature.AndPattern | Feature.TypePattern : 0);
return new CSharpAnalyzer(syntaxFacts, features);
}
protected override SyntaxTriviaList GetLeadingTriviaToTransfer(SyntaxNode syntaxToRemove)
{
if (syntaxToRemove is (IfStatementSyntax or BlockSyntax) and { Parent: ElseClauseSyntax elseClause } &&
elseClause.ElseKeyword.LeadingTrivia.Any(t => t.IsSingleOrMultiLineComment()))
{
// users sometimes write:
//
// // Comment
// else if (x == b)
//
// Attempt to move 'comment' over to the switch section.
return elseClause.ElseKeyword.LeadingTrivia;
}
return default;
}
}
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