meetup-web-mocks/node_modules/history/lib/createHistory.js

Meetup Web Mocks

'use strict';

exports.__esModule = true;

var _AsyncUtils = require('./AsyncUtils');

var _PathUtils = require('./PathUtils');

var _runTransitionHook = require('./runTransitionHook');

var _runTransitionHook2 = _interopRequireDefault(_runTransitionHook);

var _Actions = require('./Actions');

var _LocationUtils = require('./LocationUtils');

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

var createHistory = function createHistory() {
  var options = arguments.length <= 0 || arguments[0] === undefined ? {} : arguments[0];
  var getCurrentLocation = options.getCurrentLocation;
  var getUserConfirmation = options.getUserConfirmation;
  var pushLocation = options.pushLocation;
  var replaceLocation = options.replaceLocation;
  var go = options.go;
  var keyLength = options.keyLength;


  var currentLocation = void 0;
  var pendingLocation = void 0;
  var beforeListeners = [];
  var listeners = [];
  var allKeys = [];

  var getCurrentIndex = function getCurrentIndex() {
    if (pendingLocation && pendingLocation.action === _Actions.POP) return allKeys.indexOf(pendingLocation.key);

    if (currentLocation) return allKeys.indexOf(currentLocation.key);

    return -1;
  };

  var updateLocation = function updateLocation(nextLocation) {
    var currentIndex = getCurrentIndex();

    currentLocation = nextLocation;

    if (currentLocation.action === _Actions.PUSH) {
      allKeys = [].concat(allKeys.slice(0, currentIndex + 1), [currentLocation.key]);
    } else if (currentLocation.action === _Actions.REPLACE) {
      allKeys[currentIndex] = currentLocation.key;
    }

    listeners.forEach(function (listener) {
      return listener(currentLocation);
    });
  };

  var listenBefore = function listenBefore(listener) {
    beforeListeners.push(listener);

    return function () {
      return beforeListeners = beforeListeners.filter(function (item) {
        return item !== listener;
      });
    };
  };

  var listen = function listen(listener) {
    listeners.push(listener);

    return function () {
      return listeners = listeners.filter(function (item) {
        return item !== listener;
      });
    };
  };

  var confirmTransitionTo = function confirmTransitionTo(location, callback) {
    (0, _AsyncUtils.loopAsync)(beforeListeners.length, function (index, next, done) {
      (0, _runTransitionHook2.default)(beforeListeners[index], location, function (result) {
        return result != null ? done(result) : next();
      });
    }, function (message) {
      if (getUserConfirmation && typeof message === 'string') {
        getUserConfirmation(message, function (ok) {
          return callback(ok !== false);
        });
      } else {
        callback(message !== false);
      }
    });
  };

  var transitionTo = function transitionTo(nextLocation) {
    if (currentLocation && (0, _LocationUtils.locationsAreEqual)(currentLocation, nextLocation) || pendingLocation && (0, _LocationUtils.locationsAreEqual)(pendingLocation, nextLocation)) return; // Nothing to do

    pendingLocation = nextLocation;

    confirmTransitionTo(nextLocation, function (ok) {
      if (pendingLocation !== nextLocation) return; // Transition was interrupted during confirmation

      pendingLocation = null;

      if (ok) {
        // Treat PUSH to same path like REPLACE to be consistent with browsers
        if (nextLocation.action === _Actions.PUSH) {
          var prevPath = (0, _PathUtils.createPath)(currentLocation);
          var nextPath = (0, _PathUtils.createPath)(nextLocation);

          if (nextPath === prevPath && (0, _LocationUtils.statesAreEqual)(currentLocation.state, nextLocation.state)) nextLocation.action = _Actions.REPLACE;
        }

        if (nextLocation.action === _Actions.POP) {
          updateLocation(nextLocation);
        } else if (nextLocation.action === _Actions.PUSH) {
          if (pushLocation(nextLocation) !== false) updateLocation(nextLocation);
        } else if (nextLocation.action === _Actions.REPLACE) {
          if (replaceLocation(nextLocation) !== false) updateLocation(nextLocation);
        }
      } else if (currentLocation && nextLocation.action === _Actions.POP) {
        var prevIndex = allKeys.indexOf(currentLocation.key);
        var nextIndex = allKeys.indexOf(nextLocation.key);

        if (prevIndex !== -1 && nextIndex !== -1) go(prevIndex - nextIndex); // Restore the URL
      }
    });
  };

  var push = function push(input) {
    return transitionTo(createLocation(input, _Actions.PUSH));
  };

  var replace = function replace(input) {
    return transitionTo(createLocation(input, _Actions.REPLACE));
  };

  var goBack = function goBack() {
    return go(-1);
  };

  var goForward = function goForward() {
    return go(1);
  };

  var createKey = function createKey() {
    return Math.random().toString(36).substr(2, keyLength || 6);
  };

  var createHref = function createHref(location) {
    return (0, _PathUtils.createPath)(location);
  };

  var createLocation = function createLocation(location, action) {
    var key = arguments.length <= 2 || arguments[2] === undefined ? createKey() : arguments[2];
    return (0, _LocationUtils.createLocation)(location, action, key);
  };

  return {
    getCurrentLocation: getCurrentLocation,
    listenBefore: listenBefore,
    listen: listen,
    transitionTo: transitionTo,
    push: push,
    replace: replace,
    go: go,
    goBack: goBack,
    goForward: goForward,
    createKey: createKey,
    createPath: _PathUtils.createPath,
    createHref: createHref,
    createLocation: createLocation
  };
};

exports.default = createHistory;