public IEnumerable GetDiscoverers()

in BoostTestAdapter/Discoverers/BoostTestDiscovererFactory.cs [65:124]
49 lines of code
14 McCabe index (conditional complexity)

        public IEnumerable<FactoryResult> GetDiscoverers(IReadOnlyCollection<string> sources, Settings.BoostTestAdapterSettings settings)
        {
            var discoverers = new List<FactoryResult>();

            if ((sources == null) || (!sources.Any()))
                return discoverers;

            // Use default settings in case they are not provided by client code
            settings = settings ?? new BoostTestAdapterSettings();

            // sources that can be run on the external runner
            var externalDiscovererSources = new List<string>();

            // sources that support list-content parameter
            var listContentDiscovererSources = new List<string>();
            
            foreach (var source in sources)
            {
                string extension = Path.GetExtension(source);

                if (settings.ExternalTestRunner != null)
                {
                    if (settings.ExternalTestRunner.ExtensionType.IsMatch(extension))
                    {
                        externalDiscovererSources.Add(source);
                        continue;
                    }
                }

                // Skip modules which are not .exe
                if (string.Compare(extension, BoostTestDiscoverer.ExeExtension, true) != 0)
                {
                    continue;
                }

                // Ensure that the source is a Boost.Test module if it supports '--list_content'
                if (((settings.ForceListContent) || IsListContentSupported(source, settings)))
                {
                    listContentDiscovererSources.Add(source);
                }
            }

            if ((externalDiscovererSources.Any()) && (settings != null))
            {
                discoverers.Add(new FactoryResult()
                {
                    Discoverer = new ExternalDiscoverer(settings.ExternalTestRunner),
                    Sources = externalDiscovererSources
                });
            }

            if (listContentDiscovererSources.Any())
                discoverers.Add(new FactoryResult()
                {
                    Discoverer = new ListContentDiscoverer(),
                    Sources = listContentDiscovererSources
                });
     
            return discoverers;
        }