private static SymbolList convertList(LinkedList<String> tokens) {
List<Symbol> contents = new ArrayList<>();
tokens.removeFirst();
while (!tokens.getFirst().equals(")")) {
contents.add(convert(tokens));
}
tokens.removeFirst();
return SymbolPool.getList(contents);
}
private static SymbolAtom convertAtom(LinkedList<String> tokens) {
return SymbolPool.getAtom(tokens.removeFirst());
}