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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;
namespace Roslynator.CSharp.Analysis
{
[DiagnosticAnalyzer(LanguageNames.CSharp)]
public class AvoidUsageOfUsingAliasDirectiveAnalyzer : BaseDiagnosticAnalyzer
{
public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics
{
get { return ImmutableArray.Create(DiagnosticDescriptors.AvoidUsageOfUsingAliasDirective); }
}
public override void Initialize(AnalysisContext context)
{
if (context == null)
throw new ArgumentNullException(nameof(context));
base.Initialize(context);
context.RegisterSyntaxNodeAction(AnalyzeUsingDirective, SyntaxKind.UsingDirective);
}
public static void AnalyzeUsingDirective(SyntaxNodeAnalysisContext context)
{
var usingDirective = (UsingDirectiveSyntax)context.Node;
if (usingDirective.Alias == null)
return;
if (usingDirective.ContainsDiagnostics)
return;
if (usingDirective.SpanContainsDirectives())
return;
if (context.SemanticModel
.GetSymbol(usingDirective.Name, context.CancellationToken)?
.IsKind(SymbolKind.Namespace, SymbolKind.NamedType) == true)
{
context.ReportDiagnostic(DiagnosticDescriptors.AvoidUsageOfUsingAliasDirective, usingDirective);
}
}
}
}