dash-renderer/lib/reducers/history.js

render dash components in react

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
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, ...future]
        };
      }
    case 'REDO':
      {
        var _past = state.past,
          _present = state.present,
          _future = state.future;
        var next = _future[0];
        var newFuture = _future.slice(1);
        return {
          past: [..._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: [..._future2]
        };
      }
    default:
      {
        return state;
      }
  }
}
var _default = exports.default = history;