Load Selector Registry
public class LoadSelectorRegistry implements Iterable<Pair<String, Function1<String, Boolean>>>(source)
Registry holding registered load selectors.
Load selectors decide which resources should be loaded as filters, when the resources are (re)loaded (when the game starts, the user changes resource packs, or presses F3+T).
Each load selector accepts the string representation of a selector, parses and evaluates it, and returns a boolean indicating if the resource should be loaded.