text: 'use strict';
  
  Object.defineProperty(exports, "__esModule", {
    value: true
  });
  
  var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };
  
  var _warning = require('warning');
  
  var _warning2 = _interopRequireDefault(_warning);
  
  var _invariant = require('invariant');
  
  var _invariant2 = _interopRequireDefault(_invariant);
  
  var _LocationUtils = require('./LocationUtils');
  
  var _PathUtils = require('./PathUtils');
  
  var _createHistory = require('./createHistory');
  
  var _createHistory2 = _interopRequireDefault(_createHistory);
  
  var _Actions = require('./Actions');
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  var createStateStorage = function createStateStorage(entries) {
    return entries.filter(function (entry) {
      return entry.state;
    }).reduce(function (memo, entry) {
      memo[entry.key] = entry.state;
      return memo;
    }, {});
  };
  
  var createMemoryHistory = function createMemoryHistory() {
    var options = arguments.length <= 0 || arguments[0] === undefined ? {} : arguments[0];
  
    if (Array.isArray(options)) {
      options = { entries: options };
    } else if (typeof options === 'string') {
      options = { entries: [options] };
    }
  
    var getCurrentLocation = function getCurrentLocation() {
      var entry = entries[current];
      var path = (0, _PathUtils.createPath)(entry);
  
      var key = void 0,
          state = void 0;
      if (entry.key) {
        key = entry.key;
        state = readState(key);
      }
  
      var init = (0, _PathUtils.parsePath)(path);
  
      return (0, _LocationUtils.createLocation)(_extends({}, init, { state: state }), undefined, key);
    };
  
    var canGo = function canGo(n) {
      var index = current + n;
      return index >= 0 && index < entries.length;
    };
  
    var go = function go(n) {
      if (!n) return;
  
      if (!canGo(n)) {
        process.env.NODE_ENV !== 'production' ? (0, _warning2.default)(false, 'Cannot go(%s) there is not enough history', n) : void 0;
  
        return;
      }
  
      current += n;
      var currentLocation = getCurrentLocation();
  
      // Change action to POP
      history.transitionTo(_extends({}, currentLocation, { action: _Actions.POP }));
    };
  
    var pushLocation = function pushLocation(location) {
      current += 1;
  
      if (current < entries.length) entries.splice(current);
  
      entries.push(location);
  
      saveState(location.key, location.state);
    };
  
    var replaceLocation = function replaceLocation(location) {
      entries[current] = location;
      saveState(location.key, location.state);
    };
  
    var history = (0, _createHistory2.default)(_extends({}, options, {
      getCurrentLocation: getCurrentLocation,
      pushLocation: pushLocation,
      replaceLocation: replaceLocation,
      go: go
    }));
  
    var _options = options;
    var entries = _options.entries;
    var current = _options.current;
  
  
    if (typeof entries === 'string') {
      entries = [entries];
    } else if (!Array.isArray(entries)) {
      entries = ['/'];
    }
  
    entries = entries.map(function (entry) {
      return (0, _LocationUtils.createLocation)(entry);
    });
  
    if (current == null) {
      current = entries.length - 1;
    } else {
      !(current >= 0 && current < entries.length) ? process.env.NODE_ENV !== 'production' ? (0, _invariant2.default)(false, 'Current index must be >= 0 and < %s, was %s', entries.length, current) : (0, _invariant2.default)(false) : void 0;
    }
  
    var storage = createStateStorage(entries);
  
    var saveState = function saveState(key, state) {
      return storage[key] = state;
    };
  
    var readState = function readState(key) {
      return storage[key];
    };
  
    return history;
  };
  
  exports.default = createMemoryHistory;