private static void Handle(SyntaxNodeAnalysisContext context)
{
if (context.ContainingSymbol is IMethodSymbol method &&
context.Node is MethodDeclarationSyntax methodDeclaration &&
Disposable.IsAssignableFrom(method.ReturnType, context.Compilation))
{
using var walker = ReturnValueWalker.Borrow(methodDeclaration, ReturnValueSearch.RecursiveInside, context.SemanticModel, context.CancellationToken);
if (walker.TryFirst(x => IsCreated(x), out _) &&
walker.TryFirst(x => IsCachedOrInjected(x) && !IsNop(x), out _))
{
context.ReportDiagnostic(Diagnostic.Create(Descriptors.IDISP015DoNotReturnCachedAndCreated, methodDeclaration.Identifier.GetLocation()));
}
}
bool IsCreated(ExpressionSyntax expression)
{
return(Disposable.IsCreation(expression, context.SemanticModel, context.CancellationToken) == Result.Yes);
}
bool IsCachedOrInjected(ExpressionSyntax expression)
{
return(Disposable.IsCachedOrInjected(expression, expression, context.SemanticModel, context.CancellationToken));
}
bool IsNop(ExpressionSyntax expression)
{
return(Disposable.IsNop(expression, context.SemanticModel, context.CancellationToken));
}
}
