Function normalizeOption

cmp/options.go:535–544

normalizeOption normalizes the input options such that all Options groups are flattened and groups with a single element are reduced to that element. Only coreOptions and Options containing coreOptions are allowed.

(src Option)

// are flattened and groups with a single element are reduced to that element.
// Only coreOptions and Options containing coreOptions are allowed.
func normalizeOption(src Option) Option {
	switch opts := flattenOptions(nil, Options{src}); len(opts) {
	case 0:
		return nil
	case 1:
		return opts[0]
	default:
		return opts
	}
}

// flattenOptions copies all options in src to dst as a flat list.
// Only coreOptions and Options containing coreOptions are allowed.