gecko-dev/accessible/jsat/Constants.jsm

const { XPCOMUtils } = ChromeUtils.import(
  "resource://gre/modules/XPCOMUtils.jsm"
);

const AndroidEvents = {
  VIEW_CLICKED: 0x01,
  VIEW_LONG_CLICKED: 0x02,
  VIEW_SELECTED: 0x04,
  VIEW_FOCUSED: 0x08,
  VIEW_TEXT_CHANGED: 0x10,
  WINDOW_STATE_CHANGED: 0x20,
  VIEW_HOVER_ENTER: 0x80,
  VIEW_HOVER_EXIT: 0x100,
  WINDOW_CONTENT_CHANGED: 0x800,
  VIEW_SCROLLED: 0x1000,
  VIEW_TEXT_SELECTION_CHANGED: 0x2000,
  ANNOUNCEMENT: 0x4000,
  VIEW_ACCESSIBILITY_FOCUSED: 0x8000,
  VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY: 0x20000,
};

function ConstantsMap(aObject, aPrefix, aMap = {}, aModifier = null) {
  let offset = aPrefix.length;
  for (var name in aObject) {
    if (name.indexOf(aPrefix) === 0) {
      aMap[name.slice(offset)] = aModifier
        ? aModifier(aObject[name])
        : aObject[name];
    }
  }

  return aMap;
}

XPCOMUtils.defineLazyGetter(this, "Roles", function() {
  return ConstantsMap(Ci.nsIAccessibleRole, "ROLE_");
});

XPCOMUtils.defineLazyGetter(this, "Events", function() {
  return ConstantsMap(Ci.nsIAccessibleEvent, "EVENT_");
});

XPCOMUtils.defineLazyGetter(this, "Relations", function() {
  return ConstantsMap(Ci.nsIAccessibleRelation, "RELATION_");
});

XPCOMUtils.defineLazyGetter(this, "Prefilters", function() {
  return ConstantsMap(Ci.nsIAccessibleTraversalRule, "PREFILTER_");
});

XPCOMUtils.defineLazyGetter(this, "Filters", function() {
  return ConstantsMap(Ci.nsIAccessibleTraversalRule, "FILTER_");
});

XPCOMUtils.defineLazyGetter(this, "States", function() {
  let statesMap = ConstantsMap(Ci.nsIAccessibleStates, "STATE_", {}, val => {
    return { base: val, extended: 0 };
  });
  ConstantsMap(Ci.nsIAccessibleStates, "EXT_STATE_", statesMap, val => {
    return { base: 0, extended: val };
  });
  return statesMap;
});

var EXPORTED_SYMBOLS = [
  "Roles",
  "Events",
  "Relations",
  "Filters",
  "States",
  "Prefilters",
  "AndroidEvents",
];