Max Katz
4 years ago
committed by
GitHub
GitHub
38 changed files with 496 additions and 329 deletions
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using System; |
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using System.Globalization; |
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using Avalonia.Data; |
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using Avalonia.Data.Converters; |
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namespace Avalonia.Controls.Converters |
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{ |
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/// <summary>
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/// Converter that will do nothing (not update bound values) when a null value is encountered.
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/// This converter enables binding nullable with non-nullable properties in some scenarios.
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/// </summary>
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public class DoNothingForNullConverter : IValueConverter |
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{ |
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/// <inheritdoc/>
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public object? Convert( |
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object? value, |
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Type targetType, |
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object? parameter, |
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CultureInfo culture) |
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{ |
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return value ?? BindingOperations.DoNothing; |
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} |
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/// <inheritdoc/>
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public object? ConvertBack( |
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object? value, |
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Type targetType, |
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object? parameter, |
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CultureInfo culture) |
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{ |
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return value ?? BindingOperations.DoNothing; |
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} |
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} |
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} |
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@ -0,0 +1,64 @@ |
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using System.Collections.Immutable; |
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using System.Linq; |
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using Microsoft.CodeAnalysis; |
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using Microsoft.CodeAnalysis.CSharp.Syntax; |
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using Microsoft.CodeAnalysis.Diagnostics; |
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namespace DevAnalyzers |
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{ |
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[DiagnosticAnalyzer(LanguageNames.CSharp)] |
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public class OnPropertyChangedOverrideAnalyzer : DiagnosticAnalyzer |
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{ |
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public const string DiagnosticId = "AVADEV2001"; |
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private static readonly DiagnosticDescriptor Rule = new DiagnosticDescriptor( |
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DiagnosticId, |
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"Missing invoke base.OnPropertyChanged", |
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"Method '{0}' do not invoke base.{0}", |
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"Potential issue", |
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DiagnosticSeverity.Warning, |
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isEnabledByDefault: true, |
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description: "The OnPropertyChanged of the base class was not invoked in the override method declaration, which could lead to unwanted behavior."); |
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public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics => ImmutableArray.Create(Rule); |
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public override void Initialize(AnalysisContext context) |
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{ |
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context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.None); |
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context.EnableConcurrentExecution(); |
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context.RegisterSymbolAction(AnalyzeMethod, SymbolKind.Method); |
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} |
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private static void AnalyzeMethod(SymbolAnalysisContext context) |
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{ |
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if (context.Symbol is IMethodSymbol currentMethod |
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&& currentMethod.Name == "OnPropertyChanged" |
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&& currentMethod.OverriddenMethod is IMethodSymbol originalMethod) |
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{ |
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var declaration = currentMethod.DeclaringSyntaxReferences.FirstOrDefault() |
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?.GetSyntax(context.CancellationToken); |
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if (declaration is not null && context.Compilation.GetSemanticModel(declaration!.SyntaxTree) is { } semanticModel) |
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{ |
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if (declaration.SyntaxTree.TryGetRoot(out var root)) |
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{ |
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var baseInvocations = root.DescendantNodes().OfType<BaseExpressionSyntax>(); |
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if (baseInvocations.Any()) |
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{ |
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foreach (var baseInvocation in baseInvocations) |
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{ |
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var parent = baseInvocation.Parent; |
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var targetSymbol = semanticModel.GetSymbolInfo(parent, context.CancellationToken); |
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if (SymbolEqualityComparer.Default.Equals(targetSymbol.Symbol, originalMethod)) |
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{ |
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return; |
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} |
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} |
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} |
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context.ReportDiagnostic(Diagnostic.Create(Rule, currentMethod.Locations[0], currentMethod.Name)); |
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} |
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} |
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} |
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} |
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} |
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} |
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