Function lookupKey

static/js/codemirror/codemirror.js:3217–3240

(name, maps, handle)

  }

  function lookupKey(name, maps, handle) {
    function lookup(map) {
      map = getKeyMap(map);
      var found = map[name];
      if (found === false) return "stop";
      if (found != null && handle(found)) return true;
      if (map.nofallthrough) return "stop";

      var fallthrough = map.fallthrough;
      if (fallthrough == null) return false;
      if (Object.prototype.toString.call(fallthrough) != "[object Array]")
        return lookup(fallthrough);
      for (var i = 0, e = fallthrough.length; i < e; ++i) {
        var done = lookup(fallthrough[i]);
        if (done) return done;
      }
      return false;
    }

    for (var i = 0; i < maps.length; ++i) {
      var done = lookup(maps[i]);
      if (done) return done;
    }
  }
  function isModifierKey(event) {
    var name = keyNames[event.keyCode];
    return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod";