src/Lucene.Net.CodeAnalysis.Dev/LuceneDev1xxx/LuceneDev1002_FloatingPointArithmeticCSCodeAnalyzer.cs

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
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 * KIND, either express or implied.  See the License for the
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using Lucene.Net.CodeAnalysis.Dev.Utility;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.Diagnostics;
using System.Collections.Immutable;

namespace Lucene.Net.CodeAnalysis.Dev
{
    [DiagnosticAnalyzer(LanguageNames.CSharp)]
    public class LuceneDev1002_FloatingPointArithmeticCSCodeAnalyzer : DiagnosticAnalyzer
    {
        public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics => [Descriptors.LuceneDev1002_FloatingPointArithmetic];

        public override void Initialize(AnalysisContext context)
        {
            context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.Analyze);
            context.EnableConcurrentExecution();

            // TODO: Consider registering other actions that act on syntax instead of or in addition to symbols
            // See https://github.com/dotnet/roslyn/blob/main/docs/analyzers/Analyzer%20Actions%20Semantics.md for more information
            //context.RegisterSymbolAction(AnalyzeSymbol, SymbolKind.NamedType);
            context.RegisterSyntaxNodeAction(AnalyzeNodeCS, SyntaxKind.MultiplyExpression, SyntaxKind.MultiplyAssignmentExpression, SyntaxKind.DivideExpression, SyntaxKind.DivideAssignmentExpression);
            //context.RegisterSyntaxNodeAction(AnalyzeEqualsMethodNode, SyntaxKind.InvocationExpression);
        }

        private static void AnalyzeNodeCS(SyntaxNodeAnalysisContext context)
        {
            //if (context.Node is Microsoft.CodeAnalysis.CSharp.Syntax.ExpressionSyntax expression)
            //{
            //    bool hasFloatingPointType = false;

            //    foreach (var descendantNode in expression.DescendantNodes())
            //    {
            //        if (descendantNode is Microsoft.CodeAnalysis.CSharp.Syntax.CastExpressionSyntax castExpression)
            //        {
            //            var symbolInfo = Microsoft.CodeAnalysis.CSharp.CSharpExtensions.GetSymbolInfo(context.SemanticModel, castExpression.Expression);

            //            if (Helpers.FloatingPoint.IsFloatingPointType(symbolInfo))
            //            {
            //                hasFloatingPointType = true;
            //                break; // Report
            //            }
            //        }
            //        else if (descendantNode is Microsoft.CodeAnalysis.CSharp.Syntax.PredefinedTypeSyntax predefinedType)
            //        {

            //        }

            //        //var symbolInfo = Microsoft.CodeAnalysis.CSharp.CSharpExtensions.GetSymbolInfo(context.SemanticModel, descendantNode.);
            //    }

            //    if (expression.Kind() == SyntaxKind.MultiplyExpression)
            //    {

            //    }

            context.ReportDiagnostic(Diagnostic.Create(Descriptors.LuceneDev1002_FloatingPointArithmetic, context.Node.GetLocation(), context.Node.ToString()));
        }
    }
}