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FixerWithFixAllAnalyzer.cs
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FixerWithFixAllAnalyzer.cs
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// Copyright (c) Microsoft. All Rights Reserved. Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using Analyzer.Utilities;
using Analyzer.Utilities.Extensions;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.Diagnostics;
using Microsoft.CodeAnalysis.Operations;
namespace Microsoft.CodeAnalysis.Analyzers.FixAnalyzers
{
/// <summary>
/// A <see cref="CodeFixProvider"/> that intends to support fix all occurrences must classify the registered code actions into equivalence classes by assigning it an explicit, non-null equivalence key which is unique across all registered code actions by this fixer.
/// This enables the <see cref="FixAllProvider"/> to fix all diagnostics in the required scope by applying code actions from this fixer that are in the equivalence class of the trigger code action.
/// This analyzer catches violations of this requirement in the code actions registered by a <see cref="CodeFixProvider"/> that supports <see cref="FixAllProvider"/>.
/// </summary>
[DiagnosticAnalyzer(LanguageNames.CSharp, LanguageNames.VisualBasic)]
public sealed class FixerWithFixAllAnalyzer : DiagnosticAnalyzer
{
private const string CodeActionMetadataName = "Microsoft.CodeAnalysis.CodeActions.CodeAction";
private const string CreateMethodName = "Create";
private const string EquivalenceKeyPropertyName = "EquivalenceKey";
private const string EquivalenceKeyParameterName = "equivalenceKey";
internal const string CodeFixProviderMetadataName = "Microsoft.CodeAnalysis.CodeFixes.CodeFixProvider";
internal const string GetFixAllProviderMethodName = "GetFixAllProvider";
private static readonly LocalizableString s_localizableCreateCodeActionWithEquivalenceKeyTitle = new LocalizableResourceString(nameof(CodeAnalysisDiagnosticsResources.CreateCodeActionWithEquivalenceKeyTitle), CodeAnalysisDiagnosticsResources.ResourceManager, typeof(CodeAnalysisDiagnosticsResources));
private static readonly LocalizableString s_localizableCreateCodeActionWithEquivalenceKeyMessage = new LocalizableResourceString(nameof(CodeAnalysisDiagnosticsResources.CreateCodeActionWithEquivalenceKeyMessage), CodeAnalysisDiagnosticsResources.ResourceManager, typeof(CodeAnalysisDiagnosticsResources));
private static readonly LocalizableString s_localizableOverrideCodeActionEquivalenceKeyTitle = new LocalizableResourceString(nameof(CodeAnalysisDiagnosticsResources.OverrideCodeActionEquivalenceKeyTitle), CodeAnalysisDiagnosticsResources.ResourceManager, typeof(CodeAnalysisDiagnosticsResources));
private static readonly LocalizableString s_localizableOverrideCodeActionEquivalenceKeyMessage = new LocalizableResourceString(nameof(CodeAnalysisDiagnosticsResources.OverrideCodeActionEquivalenceKeyMessage), CodeAnalysisDiagnosticsResources.ResourceManager, typeof(CodeAnalysisDiagnosticsResources));
private static readonly LocalizableString s_localizableOverrideGetFixAllProviderTitle = new LocalizableResourceString(nameof(CodeAnalysisDiagnosticsResources.OverrideGetFixAllProviderTitle), CodeAnalysisDiagnosticsResources.ResourceManager, typeof(CodeAnalysisDiagnosticsResources));
private static readonly LocalizableString s_localizableOverrideGetFixAllProviderMessage = new LocalizableResourceString(nameof(CodeAnalysisDiagnosticsResources.OverrideGetFixAllProviderMessage), CodeAnalysisDiagnosticsResources.ResourceManager, typeof(CodeAnalysisDiagnosticsResources));
private static readonly LocalizableString s_localizableCodeActionNeedsEquivalenceKeyDescription = new LocalizableResourceString(nameof(CodeAnalysisDiagnosticsResources.CodeActionNeedsEquivalenceKeyDescription), CodeAnalysisDiagnosticsResources.ResourceManager, typeof(CodeAnalysisDiagnosticsResources));
private static readonly LocalizableString s_localizableOverrideGetFixAllProviderDescription = new LocalizableResourceString(nameof(CodeAnalysisDiagnosticsResources.OverrideGetFixAllProviderDescription), CodeAnalysisDiagnosticsResources.ResourceManager, typeof(CodeAnalysisDiagnosticsResources));
internal static readonly DiagnosticDescriptor CreateCodeActionEquivalenceKeyRule = new DiagnosticDescriptor(
DiagnosticIds.CreateCodeActionWithEquivalenceKeyRuleId,
s_localizableCreateCodeActionWithEquivalenceKeyTitle,
s_localizableCreateCodeActionWithEquivalenceKeyMessage,
"Correctness",
DiagnosticHelpers.DefaultDiagnosticSeverity,
description: s_localizableCodeActionNeedsEquivalenceKeyDescription,
isEnabledByDefault: DiagnosticHelpers.EnabledByDefaultIfNotBuildingVSIX,
customTags: WellKnownDiagnosticTags.Telemetry);
internal static readonly DiagnosticDescriptor OverrideCodeActionEquivalenceKeyRule = new DiagnosticDescriptor(
DiagnosticIds.OverrideCodeActionEquivalenceKeyRuleId,
s_localizableOverrideCodeActionEquivalenceKeyTitle,
s_localizableOverrideCodeActionEquivalenceKeyMessage,
"Correctness",
DiagnosticHelpers.DefaultDiagnosticSeverity,
description: s_localizableCodeActionNeedsEquivalenceKeyDescription,
isEnabledByDefault: DiagnosticHelpers.EnabledByDefaultIfNotBuildingVSIX,
customTags: WellKnownDiagnosticTags.Telemetry);
internal static readonly DiagnosticDescriptor OverrideGetFixAllProviderRule = new DiagnosticDescriptor(
DiagnosticIds.OverrideGetFixAllProviderRuleId,
s_localizableOverrideGetFixAllProviderTitle,
s_localizableOverrideGetFixAllProviderMessage,
"Correctness",
DiagnosticHelpers.DefaultDiagnosticSeverity,
description: s_localizableOverrideGetFixAllProviderDescription,
isEnabledByDefault: DiagnosticHelpers.EnabledByDefaultIfNotBuildingVSIX,
customTags: WellKnownDiagnosticTags.Telemetry);
public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics =>
ImmutableArray.Create(CreateCodeActionEquivalenceKeyRule, OverrideCodeActionEquivalenceKeyRule, OverrideGetFixAllProviderRule);
public override void Initialize(AnalysisContext context)
{
context.EnableConcurrentExecution();
// We need to analyze generated code, but don't intend to report diagnostics on generated code.
context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.Analyze);
context.RegisterCompilationStartAction(CreateAnalyzerWithinCompilation);
}
private void CreateAnalyzerWithinCompilation(CompilationStartAnalysisContext context)
{
context.CancellationToken.ThrowIfCancellationRequested();
INamedTypeSymbol codeFixProviderSymbol = context.Compilation.GetOrCreateTypeByMetadataName(CodeFixProviderMetadataName);
if (codeFixProviderSymbol == null)
{
return;
}
IMethodSymbol getFixAllProviderMethod = codeFixProviderSymbol.GetMembers(GetFixAllProviderMethodName).OfType<IMethodSymbol>().FirstOrDefault();
if (getFixAllProviderMethod == null)
{
return;
}
INamedTypeSymbol codeActionSymbol = context.Compilation.GetOrCreateTypeByMetadataName(CodeActionMetadataName);
if (codeActionSymbol == null)
{
return;
}
IEnumerable<IMethodSymbol> createSymbols = codeActionSymbol.GetMembers(CreateMethodName).OfType<IMethodSymbol>();
if (createSymbols == null)
{
return;
}
IPropertySymbol equivalenceKeyProperty = codeActionSymbol.GetMembers(EquivalenceKeyPropertyName).OfType<IPropertySymbol>().FirstOrDefault();
if (equivalenceKeyProperty == null)
{
return;
}
CompilationAnalyzer compilationAnalyzer = new CompilationAnalyzer(codeFixProviderSymbol, codeActionSymbol, context.Compilation.Assembly, createMethods: ImmutableHashSet.CreateRange(createSymbols));
context.RegisterSymbolAction(compilationAnalyzer.AnalyzeNamedTypeSymbol, SymbolKind.NamedType);
context.RegisterOperationBlockStartAction(compilationAnalyzer.OperationBlockStart);
context.RegisterCompilationEndAction(compilationAnalyzer.CompilationEnd);
}
private sealed class CompilationAnalyzer
{
private readonly INamedTypeSymbol _codeFixProviderSymbol;
private readonly INamedTypeSymbol _codeActionSymbol;
private readonly ImmutableHashSet<IMethodSymbol> _createMethods;
private readonly IAssemblySymbol _sourceAssembly;
/// <summary>
/// Set of all non-abstract sub-types of <see cref="CodeFixProvider"/> in this compilation.
/// </summary>
private readonly HashSet<INamedTypeSymbol> _codeFixProviders = new HashSet<INamedTypeSymbol>();
/// <summary>
/// Set of all non-abstract sub-types of <see cref="CodeAction"/> which override <see cref="CodeAction.EquivalenceKey"/> in this compilation.
/// </summary>
private readonly HashSet<INamedTypeSymbol> _codeActionsWithEquivalenceKey = new HashSet<INamedTypeSymbol>();
/// <summary>
/// Map of invocations from code fix providers to invocations that create a code action using the static "Create" methods on <see cref="CodeAction"/>.
/// </summary>
private readonly Dictionary<INamedTypeSymbol, HashSet<IInvocationOperation>> _codeActionCreateInvocations = new Dictionary<INamedTypeSymbol, HashSet<IInvocationOperation>>();
/// <summary>
/// Map of invocations from code fix providers to object creations that create a code action using sub-types of <see cref="CodeAction"/>.
/// </summary>
private readonly Dictionary<INamedTypeSymbol, HashSet<IObjectCreationOperation>> _codeActionObjectCreations = new Dictionary<INamedTypeSymbol, HashSet<IObjectCreationOperation>>();
public CompilationAnalyzer(
INamedTypeSymbol codeFixProviderSymbol,
INamedTypeSymbol codeActionSymbol,
IAssemblySymbol sourceAssembly,
ImmutableHashSet<IMethodSymbol> createMethods)
{
_codeFixProviderSymbol = codeFixProviderSymbol;
_codeActionSymbol = codeActionSymbol;
_sourceAssembly = sourceAssembly;
_createMethods = createMethods;
}
internal void AnalyzeNamedTypeSymbol(SymbolAnalysisContext context)
{
var namedType = (INamedTypeSymbol)context.Symbol;
if (namedType.DerivesFrom(_codeFixProviderSymbol))
{
lock (_codeFixProviders)
{
_codeFixProviders.Add(namedType);
}
}
else if (IsCodeActionWithOverriddenEquivlanceKeyCore(namedType))
{
lock (_codeActionsWithEquivalenceKey)
{
_codeActionsWithEquivalenceKey.Add(namedType);
}
}
}
internal void OperationBlockStart(OperationBlockStartAnalysisContext context)
{
if (!(context.OwningSymbol is IMethodSymbol method))
{
return;
}
INamedTypeSymbol namedType = method.ContainingType;
if (!namedType.DerivesFrom(_codeFixProviderSymbol))
{
return;
}
context.RegisterOperationAction(operationContext =>
{
var invocation = (IInvocationOperation)operationContext.Operation;
if (invocation.TargetMethod is IMethodSymbol invocationSym && _createMethods.Contains(invocationSym))
{
AddOperation(namedType, invocation, _codeActionCreateInvocations);
}
},
OperationKind.Invocation);
context.RegisterOperationAction(operationContext =>
{
var objectCreation = (IObjectCreationOperation)operationContext.Operation;
IMethodSymbol constructor = objectCreation.Constructor;
if (constructor != null && constructor.ContainingType.DerivesFrom(_codeActionSymbol))
{
AddOperation(namedType, objectCreation, _codeActionObjectCreations);
}
},
OperationKind.ObjectCreation);
}
private static void AddOperation<T>(INamedTypeSymbol namedType, T operation, Dictionary<INamedTypeSymbol, HashSet<T>> map)
where T : IOperation
{
lock (map)
{
if (!map.TryGetValue(namedType, out HashSet<T> value))
{
value = new HashSet<T>();
map[namedType] = value;
}
value.Add(operation);
}
}
internal void CompilationEnd(CompilationAnalysisContext context)
{
if (_codeFixProviders == null)
{
// No fixers.
return;
}
if (_codeActionCreateInvocations == null && _codeActionObjectCreations == null)
{
// No registered fixes.
return;
}
// Analyze all fixers that have FixAll support.
// Otherwise, report RS1016 (OverrideGetFixAllProviderRule) to recommend adding FixAll support.
foreach (INamedTypeSymbol fixer in _codeFixProviders)
{
if (OverridesGetFixAllProvider(fixer))
{
AnalyzeFixerWithFixAll(fixer, context);
}
else if (fixer.BaseType != null && fixer.BaseType.Equals(_codeFixProviderSymbol))
{
Diagnostic diagnostic = Diagnostic.Create(OverrideGetFixAllProviderRule, fixer.Locations.First(), fixer.Name);
context.ReportDiagnostic(diagnostic);
}
}
return;
// Local functions
bool OverridesGetFixAllProvider(INamedTypeSymbol fixer)
{
foreach (INamedTypeSymbol type in fixer.GetBaseTypesAndThis())
{
if (!type.Equals(_codeFixProviderSymbol))
{
IMethodSymbol getFixAllProviderMethod = type.GetMembers(GetFixAllProviderMethodName).OfType<IMethodSymbol>().FirstOrDefault();
if (getFixAllProviderMethod != null && getFixAllProviderMethod.IsOverride)
{
return true;
}
}
}
return false;
}
static bool IsViolatingCodeActionCreateInvocation(IInvocationOperation invocation)
{
IParameterSymbol param = invocation.TargetMethod.Parameters.FirstOrDefault(p => p.Name == EquivalenceKeyParameterName);
if (param == null)
{
return true;
}
foreach (var argument in invocation.Arguments)
{
if (argument.Parameter.Equals(param))
{
return argument.Value.ConstantValue.HasValue && argument.Value.ConstantValue.Value == null;
}
}
return true;
}
void AnalyzeFixerWithFixAll(INamedTypeSymbol fixer, CompilationAnalysisContext context)
{
if (_codeActionCreateInvocations != null)
{
if (_codeActionCreateInvocations.TryGetValue(fixer, out HashSet<IInvocationOperation> invocations))
{
foreach (IInvocationOperation invocation in invocations)
{
if (IsViolatingCodeActionCreateInvocation(invocation))
{
Diagnostic diagnostic = Diagnostic.Create(CreateCodeActionEquivalenceKeyRule, invocation.Syntax.GetLocation(), EquivalenceKeyParameterName);
context.ReportDiagnostic(diagnostic);
}
}
}
}
if (_codeActionObjectCreations != null)
{
if (_codeActionObjectCreations.TryGetValue(fixer, out HashSet<IObjectCreationOperation> objectCreations))
{
foreach (IObjectCreationOperation objectCreation in objectCreations)
{
if (IsViolatingCodeActionObjectCreation(objectCreation))
{
Diagnostic diagnostic = Diagnostic.Create(OverrideCodeActionEquivalenceKeyRule, objectCreation.Syntax.GetLocation(), objectCreation.Constructor.ContainingType, EquivalenceKeyPropertyName);
context.ReportDiagnostic(diagnostic);
}
}
}
}
}
bool IsViolatingCodeActionObjectCreation(IObjectCreationOperation objectCreation)
{
return objectCreation.Constructor.ContainingType.GetBaseTypesAndThis().All(namedType => !IsCodeActionWithOverriddenEquivalenceKey(namedType));
// Local functions
bool IsCodeActionWithOverriddenEquivalenceKey(INamedTypeSymbol namedType)
{
if (namedType == null || namedType.Equals(_codeActionSymbol))
{
return false;
}
// We are already tracking CodeActions with equivalence key in this compilation.
if (namedType.ContainingAssembly.Equals(_sourceAssembly))
{
return _codeActionsWithEquivalenceKey != null && _codeActionsWithEquivalenceKey.Contains(namedType);
}
// For types in different compilation, perfom the check.
return IsCodeActionWithOverriddenEquivlanceKeyCore(namedType);
}
}
}
private bool IsCodeActionWithOverriddenEquivlanceKeyCore(INamedTypeSymbol namedType)
{
if (!namedType.DerivesFrom(_codeActionSymbol))
{
// Not a CodeAction.
return false;
}
IPropertySymbol equivalenceKeyProperty = namedType.GetMembers(EquivalenceKeyPropertyName).OfType<IPropertySymbol>().FirstOrDefault();
return equivalenceKeyProperty != null && equivalenceKeyProperty.IsOverride;
}
}
}
}