private ResourceLoader FromInternal()

in csharp/NativeUtils/ResourceLoader.cs [1313:1353]
32 lines of code
11 McCabe index (conditional complexity)

        private ResourceLoader FromInternal(Type clazz, string resourcePathTemplate, bool substituteVariables)
        {
            if (null == resourcePathTemplate)
                throw new ArgumentNullException(nameof(resourcePathTemplate));

            if (null != _resourcePrefix)
                throw new ArgumentException("Resource path is already specified!");

            if (null != _class)
            {
                if (null != clazz && clazz != _class)
                throw new ArgumentException($"Parent class is already set: %s: {_class}");
            }
            else
            {
                if (null != clazz)
                    _class = clazz;
                else
                {
                    Type stackClass = VariablesMapper.TryDetectCaller();
                    _class = stackClass != null ? stackClass : this.GetType();
                }
            }

            _resourcePathTemplate = resourcePathTemplate;
            string pattern = substituteVariables
                ? VariablesMapper.Substitute(resourcePathTemplate) : resourcePathTemplate;
            string[] parts = pattern.Split('*');
            _resourcePrefix = _resourceSuffix = null;
            _resourceSuffix = parts.Length > 1 ? parts[1] : null;

            // TODO: Improve handling of '*', currently we allow directly specified filename again
            //if (parts.Length < 2)
            //throw new ArgumentException("Resource path template must contain * character. Example: \"MyCompany.Resources.$(OS).x$(ARCH).*\"");

            if (parts.Length > 2)
                throw new ArgumentException("Resource path template must contain exactly one * character!");

            _resourcePrefix = parts[0];
            return this;
        }