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// Copyright (c) Josef Pihrt. 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 Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Diagnostics;
using Roslynator.CSharp.Syntax;
namespace Roslynator.CSharp.Analysis
{
[DiagnosticAnalyzer(LanguageNames.CSharp)]
public class UnnecessaryInterpolationAnalyzer : BaseDiagnosticAnalyzer
{
public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics
{
get { return ImmutableArray.Create(DiagnosticDescriptors.UnnecessaryInterpolation); }
}
public override void Initialize(AnalysisContext context)
{
if (context == null)
throw new ArgumentNullException(nameof(context));
base.Initialize(context);
context.RegisterSyntaxNodeAction(AnalyzeInterpolation, SyntaxKind.Interpolation);
}
public static void AnalyzeInterpolation(SyntaxNodeAnalysisContext context)
{
var interpolation = (InterpolationSyntax)context.Node;
if (interpolation.AlignmentClause != null)
return;
if (interpolation.FormatClause != null)
return;
StringLiteralExpressionInfo stringLiteralInfo = SyntaxInfo.StringLiteralExpressionInfo(interpolation.Expression);
if (!stringLiteralInfo.Success)
return;
if (!(interpolation.Parent is InterpolatedStringExpressionSyntax interpolatedString))
return;
if (interpolatedString.StringStartToken.ValueText.Contains("@") != stringLiteralInfo.IsVerbatim)
return;
context.ReportDiagnostic(DiagnosticDescriptors.UnnecessaryInterpolation, interpolation);
}
}
}