private bool TryGetFileToTransform()

in src/Microsoft.VisualStudio.SlowCheetah.VS/Package/PreviewTransformCommand.cs [282:346]
52 lines of code
11 McCabe index (conditional complexity)

        private bool TryGetFileToTransform(IVsHierarchy hierarchy, uint parentId, string transformName, out uint docId, out string documentPath)
        {
            IVsProject project = (IVsProject)hierarchy;

            // Get the project configurations to use in comparing the name
            IEnumerable<string> configs = ProjectUtilities.GetProjectConfigurations(hierarchy);

            docId = 0;
            if (ErrorHandler.Failed(project.GetMkDocument(parentId, out documentPath)))
            {
                return false;
            }

            if (!PackageUtilities.IsPathValid(documentPath))
            {
                return false;
            }

            // Start by checking if the parent is the source file
            // Here, we can do a generic transform file test to allow for transformations that aren't associated with build configurations
            if (PackageUtilities.IsGenericFileTransform(Path.GetFileName(documentPath), transformName))
            {
                docId = parentId;
                return true;
            }
            else
            {
                // If the parent is no the file to transform, look at all of the original file's siblings
                // Starting with the parent's first visible child
                hierarchy.GetProperty(parentId, (int)__VSHPROPID.VSHPROPID_FirstVisibleChild, out object childIdObj);
                docId = (uint)(int)childIdObj;
                if (ErrorHandler.Failed(project.GetMkDocument(docId, out documentPath)))
                {
                    docId = 0;
                    documentPath = null;
                    return false;
                }

                if (PackageUtilities.IsPathValid(documentPath)
                    && PackageUtilities.IsFileTransformForBuildConfiguration(Path.GetFileName(documentPath), transformName, configs))
                {
                    return true;
                }
                else
                {
                    // Continue on to the the next visible siblings until there are no more files to analyze
                    while (docId != VSConstants.VSITEMID_NIL)
                    {
                        hierarchy.GetProperty(docId, (int)__VSHPROPID.VSHPROPID_NextVisibleSibling, out childIdObj);
                        docId = (uint)(int)childIdObj;
                        if (ErrorHandler.Succeeded(project.GetMkDocument(docId, out documentPath))
                            && PackageUtilities.IsPathValid(documentPath)
                            && PackageUtilities.IsFileTransformForBuildConfiguration(Path.GetFileName(documentPath), transformName, configs))
                        {
                            return true;
                        }
                    }
                }
            }

            // If we run out of files, the source file has not been found
            docId = 0;
            documentPath = null;
            return false;
        }