react-toolbox/docs/node_modules/history/lib/DOMStateStorage.js

A set of complementary tools to ReactJS.

/*eslint-disable no-empty */
'use strict';

exports.__esModule = true;
exports.saveState = saveState;
exports.readState = readState;

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }

var _warning = require('warning');

var _warning2 = _interopRequireDefault(_warning);

var KeyPrefix = '@@History/';
var QuotaExceededError = 'QuotaExceededError';

function createKey(key) {
  return KeyPrefix + key;
}

function saveState(key, state) {
  try {
    window.sessionStorage.setItem(createKey(key), JSON.stringify(state));
  } catch (error) {
    if (error.name === QuotaExceededError || window.sessionStorage.length === 0) {
      // Probably in Safari "private mode" where sessionStorage quota is 0. #42
      _warning2['default'](false, '[history] Unable to save state; sessionStorage is not available in Safari private mode');

      return;
    }

    throw error;
  }
}

function readState(key) {
  var json = window.sessionStorage.getItem(createKey(key));

  if (json) {
    try {
      return JSON.parse(json);
    } catch (error) {
      // Ignore invalid JSON.
    }
  }

  return null;
}