/// <summary>
/// Return <see cref="DiagnosticAnalyzer.SupportedDiagnostics"/> of given <paramref name="analyzer"/>.
/// </summary>
public ImmutableArray <DiagnosticDescriptor> GetSupportedDiagnosticDescriptors(
DiagnosticAnalyzer analyzer,
AnalyzerExecutor analyzerExecutor)
{
var descriptors = _descriptorCache.GetOrAdd(analyzer, key =>
{
var supportedDiagnostics = ImmutableArray <DiagnosticDescriptor> .Empty;
// Catch Exception from analyzer.SupportedDiagnostics
analyzerExecutor.ExecuteAndCatchIfThrowsAsync(analyzer, () =>
{
var supportedDiagnosticsLocal = analyzer.SupportedDiagnostics;
if (!supportedDiagnosticsLocal.IsDefaultOrEmpty)
{
supportedDiagnostics = supportedDiagnosticsLocal;
}
}).Wait(analyzerExecutor.CancellationToken);
EventHandler <Exception> handler = null;
Action <Exception, DiagnosticAnalyzer, Diagnostic> onAnalyzerException = analyzerExecutor.OnAnalyzerException;
if (onAnalyzerException != null)
{
handler = new EventHandler <Exception>((sender, ex) =>
{
var diagnostic = AnalyzerExecutor.CreateAnalyzerExceptionDiagnostic(analyzer, ex);
onAnalyzerException(ex, analyzer, diagnostic);
});
// Subscribe for exceptions from lazily evaluated localizable strings in the descriptors.
foreach (var descriptor in supportedDiagnostics)
{
descriptor.Title.OnException += handler;
descriptor.MessageFormat.OnException += handler;
descriptor.Description.OnException += handler;
}
}
return(Tuple.Create(supportedDiagnostics, handler));
});
return(descriptors.Item1);
}
