dash-renderer/lib/reducers/history.js

render dash components in react

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
function _toConsumableArray(r) { return _arrayWithoutHoles(r) || _iterableToArray(r) || _unsupportedIterableToArray(r) || _nonIterableSpread(); }
function _nonIterableSpread() { throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
function _unsupportedIterableToArray(r, a) { if (r) { if ("string" == typeof r) return _arrayLikeToArray(r, a); var t = {}.toString.call(r).slice(8, -1); return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0; } }
function _iterableToArray(r) { if ("undefined" != typeof Symbol && null != r[Symbol.iterator] || null != r["@@iterator"]) return Array.from(r); }
function _arrayWithoutHoles(r) { if (Array.isArray(r)) return _arrayLikeToArray(r); }
function _arrayLikeToArray(r, a) { (null == a || a > r.length) && (a = r.length); for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e]; return n; }
var initialHistory = {
  past: [],
  present: {},
  future: []
};
function history() {
  var state = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : initialHistory;
  var action = arguments.length > 1 ? arguments[1] : undefined;
  switch (action.type) {
    case 'UNDO':
      {
        var past = state.past,
          present = state.present,
          future = state.future;
        var previous = past[past.length - 1];
        var newPast = past.slice(0, past.length - 1);
        return {
          past: newPast,
          present: previous,
          future: [present].concat(_toConsumableArray(future))
        };
      }
    case 'REDO':
      {
        var _past = state.past,
          _present = state.present,
          _future = state.future;
        var next = _future[0];
        var newFuture = _future.slice(1);
        return {
          past: [].concat(_toConsumableArray(_past), [_present]),
          present: next,
          future: newFuture
        };
      }
    case 'REVERT':
      {
        var _past2 = state.past,
          _future2 = state.future;
        var _previous = _past2[_past2.length - 1];
        var _newPast = _past2.slice(0, _past2.length - 1);
        return {
          past: _newPast,
          present: _previous,
          future: _toConsumableArray(_future2)
        };
      }
    default:
      {
        return state;
      }
  }
}
var _default = exports.default = history;