docs: public void updateNames(
        List<String> escapeMapNames, List<String> matcherNames, List<String> filterNames) {
      // Store the names for this directive for use in building the helper function.
      escapesName = escapeMapVar >= 0 ? escapeMapNames.get(escapeMapVar) : null;
      matcherName = matcherVar >= 0 ? matcherNames.get(matcherVar) : null;
      filterName = filterVar >= 0 ? filterNames.get(filterVar) : null;
    }