ET9_WebGL_Dev/Share/Analyzer/Analyzer/EntityDelegateDeclarationAnalyzer.cs

using System;
using System.Collections.Immutable;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Diagnostics;

namespace ET.Analyzer
{
    [DiagnosticAnalyzer(LanguageNames.CSharp)]
    public class EntityDelegateDeclarationAnalyzer: DiagnosticAnalyzer
    {
        private const string Title = "实体类禁止声明委托字段或属性";

        private const string MessageFormat = "实体类: {0} 不能在类内部声明委托字段或属性: {1}";

        private const string Description = "实体类禁止声明委托字段或属性.";

        private static readonly DiagnosticDescriptor Rule =
                new DiagnosticDescriptor(DiagnosticIds.DelegateAnalyzerRuleId,
                    Title,
                    MessageFormat,
                    DiagnosticCategories.Model,
                    DiagnosticSeverity.Error,
                    true,
                    Description);

        public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics =>ImmutableArray.Create(Rule);
        
        public override void Initialize(AnalysisContext context)
        {
            if (!AnalyzerGlobalSetting.EnableAnalyzer)
            {
                return;
            }
            context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.None);
            context.EnableConcurrentExecution();
            context.RegisterSymbolAction(this.Analyzer, SymbolKind.NamedType);
        }

        private void Analyzer(SymbolAnalysisContext context)
        {
            if (!AnalyzerHelper.IsAssemblyNeedAnalyze(context.Compilation.AssemblyName, AnalyzeAssembly.AllModel))
            {
                return;
            }
            
            if (!(context.Symbol is INamedTypeSymbol namedTypeSymbol))
            {
                return;
            }

            // 筛选出实体类
            if (namedTypeSymbol.BaseType?.ToString() != Definition.EntityType)
            {
                return;
            }

            foreach (var member in namedTypeSymbol.GetMembers())
            {
                
                if (member is IFieldSymbol fieldSymbol && fieldSymbol.Type.BaseType?.ToString()==typeof(MulticastDelegate).FullName)
                {

                    ReportDiagnostic(fieldSymbol,fieldSymbol.Name);
                    continue;
                }
                
                if (member is IPropertySymbol propertySymbol && propertySymbol.Type.BaseType?.ToString()==typeof(MulticastDelegate).FullName)
                {

                    ReportDiagnostic(propertySymbol,propertySymbol.Name);
                    continue;
                }
            }
            

            void ReportDiagnostic(ISymbol symbol,string delegateName)
            {
                foreach (var syntaxReference in symbol.DeclaringSyntaxReferences)
                {
                    var syntax = syntaxReference.GetSyntax();
                    Diagnostic diagnostic = Diagnostic.Create(Rule, syntax.GetLocation(),namedTypeSymbol.Name,delegateName);
                    context.ReportDiagnostic(diagnostic);
                }
            }
        }
    }
}