vis-timeline/dist/vis-timeline-graph2d.esm.js

/**
 * vis-timeline - timeline-graph2d
 * https://github.com/visjs/vis-timeline
 *
 * Create a fully customizable, interactive timeline with items and ranges.
 *
 * @version 5.1.0
 * @date    2019-08-02T15:25:33Z
 *
 * @copyright (c) 2011-2017 Almende B.V, http://almende.com
 * @copyright (c) 2018-2019 visjs contributors, https://github.com/visjs
 *
 * @license 
 * vis.js is dual licensed under both
 *
 *   1. The Apache 2.0 License
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *   and
 *
 *   2. The MIT License
 *      http://opensource.org/licenses/MIT
 *
 * vis.js may be distributed under either license.
 */
function _defineProperty(obj, key, value) {
  if (key in obj) {
    Object.defineProperty(obj, key, {
      value: value,
      enumerable: true,
      configurable: true,
      writable: true
    });
  } else {
    obj[key] = value;
  }

  return obj;
}

var defineProperty = _defineProperty;

function _arrayWithoutHoles(arr) {
  if (Array.isArray(arr)) {
    for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) {
      arr2[i] = arr[i];
    }

    return arr2;
  }
}

var arrayWithoutHoles = _arrayWithoutHoles;

function _iterableToArray(iter) {
  if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === "[object Arguments]") return Array.from(iter);
}

var iterableToArray = _iterableToArray;

function _nonIterableSpread() {
  throw new TypeError("Invalid attempt to spread non-iterable instance");
}

var nonIterableSpread = _nonIterableSpread;

function _toConsumableArray(arr) {
  return arrayWithoutHoles(arr) || iterableToArray(arr) || nonIterableSpread();
}

var toConsumableArray = _toConsumableArray;
var commonjsGlobal = typeof globalThis !== 'undefined' ? globalThis : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};

function commonjsRequire() {
  throw new Error('Dynamic requires are not currently supported by rollup-plugin-commonjs');
}

function createCommonjsModule(fn, module) {
  return module = {
    exports: {}
  }, fn(module, module.exports), module.exports;
}

var _typeof_1 = createCommonjsModule(function (module) {
  function _typeof2(obj) {
    if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
      _typeof2 = function _typeof2(obj) {
        return typeof obj;
      };
    } else {
      _typeof2 = function _typeof2(obj) {
        return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
      };
    }

    return _typeof2(obj);
  }

  function _typeof(obj) {
    if (typeof Symbol === "function" && _typeof2(Symbol.iterator) === "symbol") {
      module.exports = _typeof = function _typeof(obj) {
        return _typeof2(obj);
      };
    } else {
      module.exports = _typeof = function _typeof(obj) {
        return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : _typeof2(obj);
      };
    }

    return _typeof(obj);
  }

  module.exports = _typeof;
});

var moment = createCommonjsModule(function (module, exports) {
  (function (global, factory) {
    module.exports = factory();
  })(commonjsGlobal, function () {
    var hookCallback;

    function hooks() {
      return hookCallback.apply(null, arguments);
    } // This is done to register the method called with moment()
    // without creating circular dependencies.


    function setHookCallback(callback) {
      hookCallback = callback;
    }

    function isArray(input) {
      return input instanceof Array || Object.prototype.toString.call(input) === '[object Array]';
    }

    function isObject(input) {
      // IE8 will treat undefined and null as object if it wasn't for
      // input != null
      return input != null && Object.prototype.toString.call(input) === '[object Object]';
    }

    function isObjectEmpty(obj) {
      if (Object.getOwnPropertyNames) {
        return Object.getOwnPropertyNames(obj).length === 0;
      } else {
        var k;

        for (k in obj) {
          if (obj.hasOwnProperty(k)) {
            return false;
          }
        }

        return true;
      }
    }

    function isUndefined(input) {
      return input === void 0;
    }

    function isNumber(input) {
      return typeof input === 'number' || Object.prototype.toString.call(input) === '[object Number]';
    }

    function isDate(input) {
      return input instanceof Date || Object.prototype.toString.call(input) === '[object Date]';
    }

    function map(arr, fn) {
      var res = [],
          i;

      for (i = 0; i < arr.length; ++i) {
        res.push(fn(arr[i], i));
      }

      return res;
    }

    function hasOwnProp(a, b) {
      return Object.prototype.hasOwnProperty.call(a, b);
    }

    function extend(a, b) {
      for (var i in b) {
        if (hasOwnProp(b, i)) {
          a[i] = b[i];
        }
      }

      if (hasOwnProp(b, 'toString')) {
        a.toString = b.toString;
      }

      if (hasOwnProp(b, 'valueOf')) {
        a.valueOf = b.valueOf;
      }

      return a;
    }

    function createUTC(input, format, locale, strict) {
      return createLocalOrUTC(input, format, locale, strict, true).utc();
    }

    function defaultParsingFlags() {
      // We need to deep clone this object.
      return {
        empty: false,
        unusedTokens: [],
        unusedInput: [],
        overflow: -2,
        charsLeftOver: 0,
        nullInput: false,
        invalidMonth: null,
        invalidFormat: false,
        userInvalidated: false,
        iso: false,
        parsedDateParts: [],
        meridiem: null,
        rfc2822: false,
        weekdayMismatch: false
      };
    }

    function getParsingFlags(m) {
      if (m._pf == null) {
        m._pf = defaultParsingFlags();
      }

      return m._pf;
    }

    var some;

    if (Array.prototype.some) {
      some = Array.prototype.some;
    } else {
      some = function (fun) {
        var t = Object(this);
        var len = t.length >>> 0;

        for (var i = 0; i < len; i++) {
          if (i in t && fun.call(this, t[i], i, t)) {
            return true;
          }
        }

        return false;
      };
    }

    function isValid(m) {
      if (m._isValid == null) {
        var flags = getParsingFlags(m);
        var parsedParts = some.call(flags.parsedDateParts, function (i) {
          return i != null;
        });
        var isNowValid = !isNaN(m._d.getTime()) && flags.overflow < 0 && !flags.empty && !flags.invalidMonth && !flags.invalidWeekday && !flags.weekdayMismatch && !flags.nullInput && !flags.invalidFormat && !flags.userInvalidated && (!flags.meridiem || flags.meridiem && parsedParts);

        if (m._strict) {
          isNowValid = isNowValid && flags.charsLeftOver === 0 && flags.unusedTokens.length === 0 && flags.bigHour === undefined;
        }

        if (Object.isFrozen == null || !Object.isFrozen(m)) {
          m._isValid = isNowValid;
        } else {
          return isNowValid;
        }
      }

      return m._isValid;
    }

    function createInvalid(flags) {
      var m = createUTC(NaN);

      if (flags != null) {
        extend(getParsingFlags(m), flags);
      } else {
        getParsingFlags(m).userInvalidated = true;
      }

      return m;
    } // Plugins that add properties should also add the key here (null value),
    // so we can properly clone ourselves.


    var momentProperties = hooks.momentProperties = [];

    function copyConfig(to, from) {
      var i, prop, val;

      if (!isUndefined(from._isAMomentObject)) {
        to._isAMomentObject = from._isAMomentObject;
      }

      if (!isUndefined(from._i)) {
        to._i = from._i;
      }

      if (!isUndefined(from._f)) {
        to._f = from._f;
      }

      if (!isUndefined(from._l)) {
        to._l = from._l;
      }

      if (!isUndefined(from._strict)) {
        to._strict = from._strict;
      }

      if (!isUndefined(from._tzm)) {
        to._tzm = from._tzm;
      }

      if (!isUndefined(from._isUTC)) {
        to._isUTC = from._isUTC;
      }

      if (!isUndefined(from._offset)) {
        to._offset = from._offset;
      }

      if (!isUndefined(from._pf)) {
        to._pf = getParsingFlags(from);
      }

      if (!isUndefined(from._locale)) {
        to._locale = from._locale;
      }

      if (momentProperties.length > 0) {
        for (i = 0; i < momentProperties.length; i++) {
          prop = momentProperties[i];
          val = from[prop];

          if (!isUndefined(val)) {
            to[prop] = val;
          }
        }
      }

      return to;
    }

    var updateInProgress = false; // Moment prototype object

    function Moment(config) {
      copyConfig(this, config);
      this._d = new Date(config._d != null ? config._d.getTime() : NaN);

      if (!this.isValid()) {
        this._d = new Date(NaN);
      } // Prevent infinite loop in case updateOffset creates new moment
      // objects.


      if (updateInProgress === false) {
        updateInProgress = true;
        hooks.updateOffset(this);
        updateInProgress = false;
      }
    }

    function isMoment(obj) {
      return obj instanceof Moment || obj != null && obj._isAMomentObject != null;
    }

    function absFloor(number) {
      if (number < 0) {
        // -0 -> 0
        return Math.ceil(number) || 0;
      } else {
        return Math.floor(number);
      }
    }

    function toInt(argumentForCoercion) {
      var coercedNumber = +argumentForCoercion,
          value = 0;

      if (coercedNumber !== 0 && isFinite(coercedNumber)) {
        value = absFloor(coercedNumber);
      }

      return value;
    } // compare two arrays, return the number of differences


    function compareArrays(array1, array2, dontConvert) {
      var len = Math.min(array1.length, array2.length),
          lengthDiff = Math.abs(array1.length - array2.length),
          diffs = 0,
          i;

      for (i = 0; i < len; i++) {
        if (dontConvert && array1[i] !== array2[i] || !dontConvert && toInt(array1[i]) !== toInt(array2[i])) {
          diffs++;
        }
      }

      return diffs + lengthDiff;
    }

    function warn(msg) {
      if (hooks.suppressDeprecationWarnings === false && typeof console !== 'undefined' && console.warn) {
        console.warn('Deprecation warning: ' + msg);
      }
    }

    function deprecate(msg, fn) {
      var firstTime = true;
      return extend(function () {
        if (hooks.deprecationHandler != null) {
          hooks.deprecationHandler(null, msg);
        }

        if (firstTime) {
          var args = [];
          var arg;

          for (var i = 0; i < arguments.length; i++) {
            arg = '';

            if (typeof arguments[i] === 'object') {
              arg += '\n[' + i + '] ';

              for (var key in arguments[0]) {
                arg += key + ': ' + arguments[0][key] + ', ';
              }

              arg = arg.slice(0, -2); // Remove trailing comma and space
            } else {
              arg = arguments[i];
            }

            args.push(arg);
          }

          warn(msg + '\nArguments: ' + Array.prototype.slice.call(args).join('') + '\n' + new Error().stack);
          firstTime = false;
        }

        return fn.apply(this, arguments);
      }, fn);
    }

    var deprecations = {};

    function deprecateSimple(name, msg) {
      if (hooks.deprecationHandler != null) {
        hooks.deprecationHandler(name, msg);
      }

      if (!deprecations[name]) {
        warn(msg);
        deprecations[name] = true;
      }
    }

    hooks.suppressDeprecationWarnings = false;
    hooks.deprecationHandler = null;

    function isFunction(input) {
      return input instanceof Function || Object.prototype.toString.call(input) === '[object Function]';
    }

    function set(config) {
      var prop, i;

      for (i in config) {
        prop = config[i];

        if (isFunction(prop)) {
          this[i] = prop;
        } else {
          this['_' + i] = prop;
        }
      }

      this._config = config; // Lenient ordinal parsing accepts just a number in addition to
      // number + (possibly) stuff coming from _dayOfMonthOrdinalParse.
      // TODO: Remove "ordinalParse" fallback in next major release.

      this._dayOfMonthOrdinalParseLenient = new RegExp((this._dayOfMonthOrdinalParse.source || this._ordinalParse.source) + '|' + /\d{1,2}/.source);
    }

    function mergeConfigs(parentConfig, childConfig) {
      var res = extend({}, parentConfig),
          prop;

      for (prop in childConfig) {
        if (hasOwnProp(childConfig, prop)) {
          if (isObject(parentConfig[prop]) && isObject(childConfig[prop])) {
            res[prop] = {};
            extend(res[prop], parentConfig[prop]);
            extend(res[prop], childConfig[prop]);
          } else if (childConfig[prop] != null) {
            res[prop] = childConfig[prop];
          } else {
            delete res[prop];
          }
        }
      }

      for (prop in parentConfig) {
        if (hasOwnProp(parentConfig, prop) && !hasOwnProp(childConfig, prop) && isObject(parentConfig[prop])) {
          // make sure changes to properties don't modify parent config
          res[prop] = extend({}, res[prop]);
        }
      }

      return res;
    }

    function Locale(config) {
      if (config != null) {
        this.set(config);
      }
    }

    var keys;

    if (Object.keys) {
      keys = Object.keys;
    } else {
      keys = function (obj) {
        var i,
            res = [];

        for (i in obj) {
          if (hasOwnProp(obj, i)) {
            res.push(i);
          }
        }

        return res;
      };
    }

    var defaultCalendar = {
      sameDay: '[Today at] LT',
      nextDay: '[Tomorrow at] LT',
      nextWeek: 'dddd [at] LT',
      lastDay: '[Yesterday at] LT',
      lastWeek: '[Last] dddd [at] LT',
      sameElse: 'L'
    };

    function calendar(key, mom, now) {
      var output = this._calendar[key] || this._calendar['sameElse'];
      return isFunction(output) ? output.call(mom, now) : output;
    }

    var defaultLongDateFormat = {
      LTS: 'h:mm:ss A',
      LT: 'h:mm A',
      L: 'MM/DD/YYYY',
      LL: 'MMMM D, YYYY',
      LLL: 'MMMM D, YYYY h:mm A',
      LLLL: 'dddd, MMMM D, YYYY h:mm A'
    };

    function longDateFormat(key) {
      var format = this._longDateFormat[key],
          formatUpper = this._longDateFormat[key.toUpperCase()];

      if (format || !formatUpper) {
        return format;
      }

      this._longDateFormat[key] = formatUpper.replace(/MMMM|MM|DD|dddd/g, function (val) {
        return val.slice(1);
      });
      return this._longDateFormat[key];
    }

    var defaultInvalidDate = 'Invalid date';

    function invalidDate() {
      return this._invalidDate;
    }

    var defaultOrdinal = '%d';
    var defaultDayOfMonthOrdinalParse = /\d{1,2}/;

    function ordinal(number) {
      return this._ordinal.replace('%d', number);
    }

    var defaultRelativeTime = {
      future: 'in %s',
      past: '%s ago',
      s: 'a few seconds',
      ss: '%d seconds',
      m: 'a minute',
      mm: '%d minutes',
      h: 'an hour',
      hh: '%d hours',
      d: 'a day',
      dd: '%d days',
      M: 'a month',
      MM: '%d months',
      y: 'a year',
      yy: '%d years'
    };

    function relativeTime(number, withoutSuffix, string, isFuture) {
      var output = this._relativeTime[string];
      return isFunction(output) ? output(number, withoutSuffix, string, isFuture) : output.replace(/%d/i, number);
    }

    function pastFuture(diff, output) {
      var format = this._relativeTime[diff > 0 ? 'future' : 'past'];
      return isFunction(format) ? format(output) : format.replace(/%s/i, output);
    }

    var aliases = {};

    function addUnitAlias(unit, shorthand) {
      var lowerCase = unit.toLowerCase();
      aliases[lowerCase] = aliases[lowerCase + 's'] = aliases[shorthand] = unit;
    }

    function normalizeUnits(units) {
      return typeof units === 'string' ? aliases[units] || aliases[units.toLowerCase()] : undefined;
    }

    function normalizeObjectUnits(inputObject) {
      var normalizedInput = {},
          normalizedProp,
          prop;

      for (prop in inputObject) {
        if (hasOwnProp(inputObject, prop)) {
          normalizedProp = normalizeUnits(prop);

          if (normalizedProp) {
            normalizedInput[normalizedProp] = inputObject[prop];
          }
        }
      }

      return normalizedInput;
    }

    var priorities = {};

    function addUnitPriority(unit, priority) {
      priorities[unit] = priority;
    }

    function getPrioritizedUnits(unitsObj) {
      var units = [];

      for (var u in unitsObj) {
        units.push({
          unit: u,
          priority: priorities[u]
        });
      }

      units.sort(function (a, b) {
        return a.priority - b.priority;
      });
      return units;
    }

    function zeroFill(number, targetLength, forceSign) {
      var absNumber = '' + Math.abs(number),
          zerosToFill = targetLength - absNumber.length,
          sign = number >= 0;
      return (sign ? forceSign ? '+' : '' : '-') + Math.pow(10, Math.max(0, zerosToFill)).toString().substr(1) + absNumber;
    }

    var formattingTokens = /(\[[^\[]*\])|(\\)?([Hh]mm(ss)?|Mo|MM?M?M?|Do|DDDo|DD?D?D?|ddd?d?|do?|w[o|w]?|W[o|W]?|Qo?|YYYYYY|YYYYY|YYYY|YY|gg(ggg?)?|GG(GGG?)?|e|E|a|A|hh?|HH?|kk?|mm?|ss?|S{1,9}|x|X|zz?|ZZ?|.)/g;
    var localFormattingTokens = /(\[[^\[]*\])|(\\)?(LTS|LT|LL?L?L?|l{1,4})/g;
    var formatFunctions = {};
    var formatTokenFunctions = {}; // token:    'M'
    // padded:   ['MM', 2]
    // ordinal:  'Mo'
    // callback: function () { this.month() + 1 }

    function addFormatToken(token, padded, ordinal, callback) {
      var func = callback;

      if (typeof callback === 'string') {
        func = function () {
          return this[callback]();
        };
      }

      if (token) {
        formatTokenFunctions[token] = func;
      }

      if (padded) {
        formatTokenFunctions[padded[0]] = function () {
          return zeroFill(func.apply(this, arguments), padded[1], padded[2]);
        };
      }

      if (ordinal) {
        formatTokenFunctions[ordinal] = function () {
          return this.localeData().ordinal(func.apply(this, arguments), token);
        };
      }
    }

    function removeFormattingTokens(input) {
      if (input.match(/\[[\s\S]/)) {
        return input.replace(/^\[|\]$/g, '');
      }

      return input.replace(/\\/g, '');
    }

    function makeFormatFunction(format) {
      var array = format.match(formattingTokens),
          i,
          length;

      for (i = 0, length = array.length; i < length; i++) {
        if (formatTokenFunctions[array[i]]) {
          array[i] = formatTokenFunctions[array[i]];
        } else {
          array[i] = removeFormattingTokens(array[i]);
        }
      }

      return function (mom) {
        var output = '',
            i;

        for (i = 0; i < length; i++) {
          output += isFunction(array[i]) ? array[i].call(mom, format) : array[i];
        }

        return output;
      };
    } // format date using native date object


    function formatMoment(m, format) {
      if (!m.isValid()) {
        return m.localeData().invalidDate();
      }

      format = expandFormat(format, m.localeData());
      formatFunctions[format] = formatFunctions[format] || makeFormatFunction(format);
      return formatFunctions[format](m);
    }

    function expandFormat(format, locale) {
      var i = 5;

      function replaceLongDateFormatTokens(input) {
        return locale.longDateFormat(input) || input;
      }

      localFormattingTokens.lastIndex = 0;

      while (i >= 0 && localFormattingTokens.test(format)) {
        format = format.replace(localFormattingTokens, replaceLongDateFormatTokens);
        localFormattingTokens.lastIndex = 0;
        i -= 1;
      }

      return format;
    }

    var match1 = /\d/; //       0 - 9

    var match2 = /\d\d/; //      00 - 99

    var match3 = /\d{3}/; //     000 - 999

    var match4 = /\d{4}/; //    0000 - 9999

    var match6 = /[+-]?\d{6}/; // -999999 - 999999

    var match1to2 = /\d\d?/; //       0 - 99

    var match3to4 = /\d\d\d\d?/; //     999 - 9999

    var match5to6 = /\d\d\d\d\d\d?/; //   99999 - 999999

    var match1to3 = /\d{1,3}/; //       0 - 999

    var match1to4 = /\d{1,4}/; //       0 - 9999

    var match1to6 = /[+-]?\d{1,6}/; // -999999 - 999999

    var matchUnsigned = /\d+/; //       0 - inf

    var matchSigned = /[+-]?\d+/; //    -inf - inf

    var matchOffset = /Z|[+-]\d\d:?\d\d/gi; // +00:00 -00:00 +0000 -0000 or Z

    var matchShortOffset = /Z|[+-]\d\d(?::?\d\d)?/gi; // +00 -00 +00:00 -00:00 +0000 -0000 or Z

    var matchTimestamp = /[+-]?\d+(\.\d{1,3})?/; // 123456789 123456789.123
    // any word (or two) characters or numbers including two/three word month in arabic.
    // includes scottish gaelic two word and hyphenated months

    var matchWord = /[0-9]{0,256}['a-z\u00A0-\u05FF\u0700-\uD7FF\uF900-\uFDCF\uFDF0-\uFF07\uFF10-\uFFEF]{1,256}|[\u0600-\u06FF\/]{1,256}(\s*?[\u0600-\u06FF]{1,256}){1,2}/i;
    var regexes = {};

    function addRegexToken(token, regex, strictRegex) {
      regexes[token] = isFunction(regex) ? regex : function (isStrict, localeData) {
        return isStrict && strictRegex ? strictRegex : regex;
      };
    }

    function getParseRegexForToken(token, config) {
      if (!hasOwnProp(regexes, token)) {
        return new RegExp(unescapeFormat(token));
      }

      return regexes[token](config._strict, config._locale);
    } // Code from http://stackoverflow.com/questions/3561493/is-there-a-regexp-escape-function-in-javascript


    function unescapeFormat(s) {
      return regexEscape(s.replace('\\', '').replace(/\\(\[)|\\(\])|\[([^\]\[]*)\]|\\(.)/g, function (matched, p1, p2, p3, p4) {
        return p1 || p2 || p3 || p4;
      }));
    }

    function regexEscape(s) {
      return s.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
    }

    var tokens = {};

    function addParseToken(token, callback) {
      var i,
          func = callback;

      if (typeof token === 'string') {
        token = [token];
      }

      if (isNumber(callback)) {
        func = function (input, array) {
          array[callback] = toInt(input);
        };
      }

      for (i = 0; i < token.length; i++) {
        tokens[token[i]] = func;
      }
    }

    function addWeekParseToken(token, callback) {
      addParseToken(token, function (input, array, config, token) {
        config._w = config._w || {};
        callback(input, config._w, config, token);
      });
    }

    function addTimeToArrayFromToken(token, input, config) {
      if (input != null && hasOwnProp(tokens, token)) {
        tokens[token](input, config._a, config, token);
      }
    }

    var YEAR = 0;
    var MONTH = 1;
    var DATE = 2;
    var HOUR = 3;
    var MINUTE = 4;
    var SECOND = 5;
    var MILLISECOND = 6;
    var WEEK = 7;
    var WEEKDAY = 8; // FORMATTING

    addFormatToken('Y', 0, 0, function () {
      var y = this.year();
      return y <= 9999 ? '' + y : '+' + y;
    });
    addFormatToken(0, ['YY', 2], 0, function () {
      return this.year() % 100;
    });
    addFormatToken(0, ['YYYY', 4], 0, 'year');
    addFormatToken(0, ['YYYYY', 5], 0, 'year');
    addFormatToken(0, ['YYYYYY', 6, true], 0, 'year'); // ALIASES

    addUnitAlias('year', 'y'); // PRIORITIES

    addUnitPriority('year', 1); // PARSING

    addRegexToken('Y', matchSigned);
    addRegexToken('YY', match1to2, match2);
    addRegexToken('YYYY', match1to4, match4);
    addRegexToken('YYYYY', match1to6, match6);
    addRegexToken('YYYYYY', match1to6, match6);
    addParseToken(['YYYYY', 'YYYYYY'], YEAR);
    addParseToken('YYYY', function (input, array) {
      array[YEAR] = input.length === 2 ? hooks.parseTwoDigitYear(input) : toInt(input);
    });
    addParseToken('YY', function (input, array) {
      array[YEAR] = hooks.parseTwoDigitYear(input);
    });
    addParseToken('Y', function (input, array) {
      array[YEAR] = parseInt(input, 10);
    }); // HELPERS

    function daysInYear(year) {
      return isLeapYear(year) ? 366 : 365;
    }

    function isLeapYear(year) {
      return year % 4 === 0 && year % 100 !== 0 || year % 400 === 0;
    } // HOOKS


    hooks.parseTwoDigitYear = function (input) {
      return toInt(input) + (toInt(input) > 68 ? 1900 : 2000);
    }; // MOMENTS


    var getSetYear = makeGetSet('FullYear', true);

    function getIsLeapYear() {
      return isLeapYear(this.year());
    }

    function makeGetSet(unit, keepTime) {
      return function (value) {
        if (value != null) {
          set$1(this, unit, value);
          hooks.updateOffset(this, keepTime);
          return this;
        } else {
          return get(this, unit);
        }
      };
    }

    function get(mom, unit) {
      return mom.isValid() ? mom._d['get' + (mom._isUTC ? 'UTC' : '') + unit]() : NaN;
    }

    function set$1(mom, unit, value) {
      if (mom.isValid() && !isNaN(value)) {
        if (unit === 'FullYear' && isLeapYear(mom.year()) && mom.month() === 1 && mom.date() === 29) {
          mom._d['set' + (mom._isUTC ? 'UTC' : '') + unit](value, mom.month(), daysInMonth(value, mom.month()));
        } else {
          mom._d['set' + (mom._isUTC ? 'UTC' : '') + unit](value);
        }
      }
    } // MOMENTS


    function stringGet(units) {
      units = normalizeUnits(units);

      if (isFunction(this[units])) {
        return this[units]();
      }

      return this;
    }

    function stringSet(units, value) {
      if (typeof units === 'object') {
        units = normalizeObjectUnits(units);
        var prioritized = getPrioritizedUnits(units);

        for (var i = 0; i < prioritized.length; i++) {
          this[prioritized[i].unit](units[prioritized[i].unit]);
        }
      } else {
        units = normalizeUnits(units);

        if (isFunction(this[units])) {
          return this[units](value);
        }
      }

      return this;
    }

    function mod(n, x) {
      return (n % x + x) % x;
    }

    var indexOf;

    if (Array.prototype.indexOf) {
      indexOf = Array.prototype.indexOf;
    } else {
      indexOf = function (o) {
        // I know
        var i;

        for (i = 0; i < this.length; ++i) {
          if (this[i] === o) {
            return i;
          }
        }

        return -1;
      };
    }

    function daysInMonth(year, month) {
      if (isNaN(year) || isNaN(month)) {
        return NaN;
      }

      var modMonth = mod(month, 12);
      year += (month - modMonth) / 12;
      return modMonth === 1 ? isLeapYear(year) ? 29 : 28 : 31 - modMonth % 7 % 2;
    } // FORMATTING


    addFormatToken('M', ['MM', 2], 'Mo', function () {
      return this.month() + 1;
    });
    addFormatToken('MMM', 0, 0, function (format) {
      return this.localeData().monthsShort(this, format);
    });
    addFormatToken('MMMM', 0, 0, function (format) {
      return this.localeData().months(this, format);
    }); // ALIASES

    addUnitAlias('month', 'M'); // PRIORITY

    addUnitPriority('month', 8); // PARSING

    addRegexToken('M', match1to2);
    addRegexToken('MM', match1to2, match2);
    addRegexToken('MMM', function (isStrict, locale) {
      return locale.monthsShortRegex(isStrict);
    });
    addRegexToken('MMMM', function (isStrict, locale) {
      return locale.monthsRegex(isStrict);
    });
    addParseToken(['M', 'MM'], function (input, array) {
      array[MONTH] = toInt(input) - 1;
    });
    addParseToken(['MMM', 'MMMM'], function (input, array, config, token) {
      var month = config._locale.monthsParse(input, token, config._strict); // if we didn't find a month name, mark the date as invalid.


      if (month != null) {
        array[MONTH] = month;
      } else {
        getParsingFlags(config).invalidMonth = input;
      }
    }); // LOCALES

    var MONTHS_IN_FORMAT = /D[oD]?(\[[^\[\]]*\]|\s)+MMMM?/;
    var defaultLocaleMonths = 'January_February_March_April_May_June_July_August_September_October_November_December'.split('_');

    function localeMonths(m, format) {
      if (!m) {
        return isArray(this._months) ? this._months : this._months['standalone'];
      }

      return isArray(this._months) ? this._months[m.month()] : this._months[(this._months.isFormat || MONTHS_IN_FORMAT).test(format) ? 'format' : 'standalone'][m.month()];
    }

    var defaultLocaleMonthsShort = 'Jan_Feb_Mar_Apr_May_Jun_Jul_Aug_Sep_Oct_Nov_Dec'.split('_');

    function localeMonthsShort(m, format) {
      if (!m) {
        return isArray(this._monthsShort) ? this._monthsShort : this._monthsShort['standalone'];
      }

      return isArray(this._monthsShort) ? this._monthsShort[m.month()] : this._monthsShort[MONTHS_IN_FORMAT.test(format) ? 'format' : 'standalone'][m.month()];
    }

    function handleStrictParse(monthName, format, strict) {
      var i,
          ii,
          mom,
          llc = monthName.toLocaleLowerCase();

      if (!this._monthsParse) {
        // this is not used
        this._monthsParse = [];
        this._longMonthsParse = [];
        this._shortMonthsParse = [];

        for (i = 0; i < 12; ++i) {
          mom = createUTC([2000, i]);
          this._shortMonthsParse[i] = this.monthsShort(mom, '').toLocaleLowerCase();
          this._longMonthsParse[i] = this.months(mom, '').toLocaleLowerCase();
        }
      }

      if (strict) {
        if (format === 'MMM') {
          ii = indexOf.call(this._shortMonthsParse, llc);
          return ii !== -1 ? ii : null;
        } else {
          ii = indexOf.call(this._longMonthsParse, llc);
          return ii !== -1 ? ii : null;
        }
      } else {
        if (format === 'MMM') {
          ii = indexOf.call(this._shortMonthsParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._longMonthsParse, llc);
          return ii !== -1 ? ii : null;
        } else {
          ii = indexOf.call(this._longMonthsParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._shortMonthsParse, llc);
          return ii !== -1 ? ii : null;
        }
      }
    }

    function localeMonthsParse(monthName, format, strict) {
      var i, mom, regex;

      if (this._monthsParseExact) {
        return handleStrictParse.call(this, monthName, format, strict);
      }

      if (!this._monthsParse) {
        this._monthsParse = [];
        this._longMonthsParse = [];
        this._shortMonthsParse = [];
      } // TODO: add sorting
      // Sorting makes sure if one month (or abbr) is a prefix of another
      // see sorting in computeMonthsParse


      for (i = 0; i < 12; i++) {
        // make the regex if we don't have it already
        mom = createUTC([2000, i]);

        if (strict && !this._longMonthsParse[i]) {
          this._longMonthsParse[i] = new RegExp('^' + this.months(mom, '').replace('.', '') + '$', 'i');
          this._shortMonthsParse[i] = new RegExp('^' + this.monthsShort(mom, '').replace('.', '') + '$', 'i');
        }

        if (!strict && !this._monthsParse[i]) {
          regex = '^' + this.months(mom, '') + '|^' + this.monthsShort(mom, '');
          this._monthsParse[i] = new RegExp(regex.replace('.', ''), 'i');
        } // test the regex


        if (strict && format === 'MMMM' && this._longMonthsParse[i].test(monthName)) {
          return i;
        } else if (strict && format === 'MMM' && this._shortMonthsParse[i].test(monthName)) {
          return i;
        } else if (!strict && this._monthsParse[i].test(monthName)) {
          return i;
        }
      }
    } // MOMENTS


    function setMonth(mom, value) {
      var dayOfMonth;

      if (!mom.isValid()) {
        // No op
        return mom;
      }

      if (typeof value === 'string') {
        if (/^\d+$/.test(value)) {
          value = toInt(value);
        } else {
          value = mom.localeData().monthsParse(value); // TODO: Another silent failure?

          if (!isNumber(value)) {
            return mom;
          }
        }
      }

      dayOfMonth = Math.min(mom.date(), daysInMonth(mom.year(), value));

      mom._d['set' + (mom._isUTC ? 'UTC' : '') + 'Month'](value, dayOfMonth);

      return mom;
    }

    function getSetMonth(value) {
      if (value != null) {
        setMonth(this, value);
        hooks.updateOffset(this, true);
        return this;
      } else {
        return get(this, 'Month');
      }
    }

    function getDaysInMonth() {
      return daysInMonth(this.year(), this.month());
    }

    var defaultMonthsShortRegex = matchWord;

    function monthsShortRegex(isStrict) {
      if (this._monthsParseExact) {
        if (!hasOwnProp(this, '_monthsRegex')) {
          computeMonthsParse.call(this);
        }

        if (isStrict) {
          return this._monthsShortStrictRegex;
        } else {
          return this._monthsShortRegex;
        }
      } else {
        if (!hasOwnProp(this, '_monthsShortRegex')) {
          this._monthsShortRegex = defaultMonthsShortRegex;
        }

        return this._monthsShortStrictRegex && isStrict ? this._monthsShortStrictRegex : this._monthsShortRegex;
      }
    }

    var defaultMonthsRegex = matchWord;

    function monthsRegex(isStrict) {
      if (this._monthsParseExact) {
        if (!hasOwnProp(this, '_monthsRegex')) {
          computeMonthsParse.call(this);
        }

        if (isStrict) {
          return this._monthsStrictRegex;
        } else {
          return this._monthsRegex;
        }
      } else {
        if (!hasOwnProp(this, '_monthsRegex')) {
          this._monthsRegex = defaultMonthsRegex;
        }

        return this._monthsStrictRegex && isStrict ? this._monthsStrictRegex : this._monthsRegex;
      }
    }

    function computeMonthsParse() {
      function cmpLenRev(a, b) {
        return b.length - a.length;
      }

      var shortPieces = [],
          longPieces = [],
          mixedPieces = [],
          i,
          mom;

      for (i = 0; i < 12; i++) {
        // make the regex if we don't have it already
        mom = createUTC([2000, i]);
        shortPieces.push(this.monthsShort(mom, ''));
        longPieces.push(this.months(mom, ''));
        mixedPieces.push(this.months(mom, ''));
        mixedPieces.push(this.monthsShort(mom, ''));
      } // Sorting makes sure if one month (or abbr) is a prefix of another it
      // will match the longer piece.


      shortPieces.sort(cmpLenRev);
      longPieces.sort(cmpLenRev);
      mixedPieces.sort(cmpLenRev);

      for (i = 0; i < 12; i++) {
        shortPieces[i] = regexEscape(shortPieces[i]);
        longPieces[i] = regexEscape(longPieces[i]);
      }

      for (i = 0; i < 24; i++) {
        mixedPieces[i] = regexEscape(mixedPieces[i]);
      }

      this._monthsRegex = new RegExp('^(' + mixedPieces.join('|') + ')', 'i');
      this._monthsShortRegex = this._monthsRegex;
      this._monthsStrictRegex = new RegExp('^(' + longPieces.join('|') + ')', 'i');
      this._monthsShortStrictRegex = new RegExp('^(' + shortPieces.join('|') + ')', 'i');
    }

    function createDate(y, m, d, h, M, s, ms) {
      // can't just apply() to create a date:
      // https://stackoverflow.com/q/181348
      var date; // the date constructor remaps years 0-99 to 1900-1999

      if (y < 100 && y >= 0) {
        // preserve leap years using a full 400 year cycle, then reset
        date = new Date(y + 400, m, d, h, M, s, ms);

        if (isFinite(date.getFullYear())) {
          date.setFullYear(y);
        }
      } else {
        date = new Date(y, m, d, h, M, s, ms);
      }

      return date;
    }

    function createUTCDate(y) {
      var date; // the Date.UTC function remaps years 0-99 to 1900-1999

      if (y < 100 && y >= 0) {
        var args = Array.prototype.slice.call(arguments); // preserve leap years using a full 400 year cycle, then reset

        args[0] = y + 400;
        date = new Date(Date.UTC.apply(null, args));

        if (isFinite(date.getUTCFullYear())) {
          date.setUTCFullYear(y);
        }
      } else {
        date = new Date(Date.UTC.apply(null, arguments));
      }

      return date;
    } // start-of-first-week - start-of-year


    function firstWeekOffset(year, dow, doy) {
      var // first-week day -- which january is always in the first week (4 for iso, 1 for other)
      fwd = 7 + dow - doy,
          // first-week day local weekday -- which local weekday is fwd
      fwdlw = (7 + createUTCDate(year, 0, fwd).getUTCDay() - dow) % 7;
      return -fwdlw + fwd - 1;
    } // https://en.wikipedia.org/wiki/ISO_week_date#Calculating_a_date_given_the_year.2C_week_number_and_weekday


    function dayOfYearFromWeeks(year, week, weekday, dow, doy) {
      var localWeekday = (7 + weekday - dow) % 7,
          weekOffset = firstWeekOffset(year, dow, doy),
          dayOfYear = 1 + 7 * (week - 1) + localWeekday + weekOffset,
          resYear,
          resDayOfYear;

      if (dayOfYear <= 0) {
        resYear = year - 1;
        resDayOfYear = daysInYear(resYear) + dayOfYear;
      } else if (dayOfYear > daysInYear(year)) {
        resYear = year + 1;
        resDayOfYear = dayOfYear - daysInYear(year);
      } else {
        resYear = year;
        resDayOfYear = dayOfYear;
      }

      return {
        year: resYear,
        dayOfYear: resDayOfYear
      };
    }

    function weekOfYear(mom, dow, doy) {
      var weekOffset = firstWeekOffset(mom.year(), dow, doy),
          week = Math.floor((mom.dayOfYear() - weekOffset - 1) / 7) + 1,
          resWeek,
          resYear;

      if (week < 1) {
        resYear = mom.year() - 1;
        resWeek = week + weeksInYear(resYear, dow, doy);
      } else if (week > weeksInYear(mom.year(), dow, doy)) {
        resWeek = week - weeksInYear(mom.year(), dow, doy);
        resYear = mom.year() + 1;
      } else {
        resYear = mom.year();
        resWeek = week;
      }

      return {
        week: resWeek,
        year: resYear
      };
    }

    function weeksInYear(year, dow, doy) {
      var weekOffset = firstWeekOffset(year, dow, doy),
          weekOffsetNext = firstWeekOffset(year + 1, dow, doy);
      return (daysInYear(year) - weekOffset + weekOffsetNext) / 7;
    } // FORMATTING


    addFormatToken('w', ['ww', 2], 'wo', 'week');
    addFormatToken('W', ['WW', 2], 'Wo', 'isoWeek'); // ALIASES

    addUnitAlias('week', 'w');
    addUnitAlias('isoWeek', 'W'); // PRIORITIES

    addUnitPriority('week', 5);
    addUnitPriority('isoWeek', 5); // PARSING

    addRegexToken('w', match1to2);
    addRegexToken('ww', match1to2, match2);
    addRegexToken('W', match1to2);
    addRegexToken('WW', match1to2, match2);
    addWeekParseToken(['w', 'ww', 'W', 'WW'], function (input, week, config, token) {
      week[token.substr(0, 1)] = toInt(input);
    }); // HELPERS
    // LOCALES

    function localeWeek(mom) {
      return weekOfYear(mom, this._week.dow, this._week.doy).week;
    }

    var defaultLocaleWeek = {
      dow: 0,
      // Sunday is the first day of the week.
      doy: 6 // The week that contains Jan 6th is the first week of the year.

    };

    function localeFirstDayOfWeek() {
      return this._week.dow;
    }

    function localeFirstDayOfYear() {
      return this._week.doy;
    } // MOMENTS


    function getSetWeek(input) {
      var week = this.localeData().week(this);
      return input == null ? week : this.add((input - week) * 7, 'd');
    }

    function getSetISOWeek(input) {
      var week = weekOfYear(this, 1, 4).week;
      return input == null ? week : this.add((input - week) * 7, 'd');
    } // FORMATTING


    addFormatToken('d', 0, 'do', 'day');
    addFormatToken('dd', 0, 0, function (format) {
      return this.localeData().weekdaysMin(this, format);
    });
    addFormatToken('ddd', 0, 0, function (format) {
      return this.localeData().weekdaysShort(this, format);
    });
    addFormatToken('dddd', 0, 0, function (format) {
      return this.localeData().weekdays(this, format);
    });
    addFormatToken('e', 0, 0, 'weekday');
    addFormatToken('E', 0, 0, 'isoWeekday'); // ALIASES

    addUnitAlias('day', 'd');
    addUnitAlias('weekday', 'e');
    addUnitAlias('isoWeekday', 'E'); // PRIORITY

    addUnitPriority('day', 11);
    addUnitPriority('weekday', 11);
    addUnitPriority('isoWeekday', 11); // PARSING

    addRegexToken('d', match1to2);
    addRegexToken('e', match1to2);
    addRegexToken('E', match1to2);
    addRegexToken('dd', function (isStrict, locale) {
      return locale.weekdaysMinRegex(isStrict);
    });
    addRegexToken('ddd', function (isStrict, locale) {
      return locale.weekdaysShortRegex(isStrict);
    });
    addRegexToken('dddd', function (isStrict, locale) {
      return locale.weekdaysRegex(isStrict);
    });
    addWeekParseToken(['dd', 'ddd', 'dddd'], function (input, week, config, token) {
      var weekday = config._locale.weekdaysParse(input, token, config._strict); // if we didn't get a weekday name, mark the date as invalid


      if (weekday != null) {
        week.d = weekday;
      } else {
        getParsingFlags(config).invalidWeekday = input;
      }
    });
    addWeekParseToken(['d', 'e', 'E'], function (input, week, config, token) {
      week[token] = toInt(input);
    }); // HELPERS

    function parseWeekday(input, locale) {
      if (typeof input !== 'string') {
        return input;
      }

      if (!isNaN(input)) {
        return parseInt(input, 10);
      }

      input = locale.weekdaysParse(input);

      if (typeof input === 'number') {
        return input;
      }

      return null;
    }

    function parseIsoWeekday(input, locale) {
      if (typeof input === 'string') {
        return locale.weekdaysParse(input) % 7 || 7;
      }

      return isNaN(input) ? null : input;
    } // LOCALES


    function shiftWeekdays(ws, n) {
      return ws.slice(n, 7).concat(ws.slice(0, n));
    }

    var defaultLocaleWeekdays = 'Sunday_Monday_Tuesday_Wednesday_Thursday_Friday_Saturday'.split('_');

    function localeWeekdays(m, format) {
      var weekdays = isArray(this._weekdays) ? this._weekdays : this._weekdays[m && m !== true && this._weekdays.isFormat.test(format) ? 'format' : 'standalone'];
      return m === true ? shiftWeekdays(weekdays, this._week.dow) : m ? weekdays[m.day()] : weekdays;
    }

    var defaultLocaleWeekdaysShort = 'Sun_Mon_Tue_Wed_Thu_Fri_Sat'.split('_');

    function localeWeekdaysShort(m) {
      return m === true ? shiftWeekdays(this._weekdaysShort, this._week.dow) : m ? this._weekdaysShort[m.day()] : this._weekdaysShort;
    }

    var defaultLocaleWeekdaysMin = 'Su_Mo_Tu_We_Th_Fr_Sa'.split('_');

    function localeWeekdaysMin(m) {
      return m === true ? shiftWeekdays(this._weekdaysMin, this._week.dow) : m ? this._weekdaysMin[m.day()] : this._weekdaysMin;
    }

    function handleStrictParse$1(weekdayName, format, strict) {
      var i,
          ii,
          mom,
          llc = weekdayName.toLocaleLowerCase();

      if (!this._weekdaysParse) {
        this._weekdaysParse = [];
        this._shortWeekdaysParse = [];
        this._minWeekdaysParse = [];

        for (i = 0; i < 7; ++i) {
          mom = createUTC([2000, 1]).day(i);
          this._minWeekdaysParse[i] = this.weekdaysMin(mom, '').toLocaleLowerCase();
          this._shortWeekdaysParse[i] = this.weekdaysShort(mom, '').toLocaleLowerCase();
          this._weekdaysParse[i] = this.weekdays(mom, '').toLocaleLowerCase();
        }
      }

      if (strict) {
        if (format === 'dddd') {
          ii = indexOf.call(this._weekdaysParse, llc);
          return ii !== -1 ? ii : null;
        } else if (format === 'ddd') {
          ii = indexOf.call(this._shortWeekdaysParse, llc);
          return ii !== -1 ? ii : null;
        } else {
          ii = indexOf.call(this._minWeekdaysParse, llc);
          return ii !== -1 ? ii : null;
        }
      } else {
        if (format === 'dddd') {
          ii = indexOf.call(this._weekdaysParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._shortWeekdaysParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._minWeekdaysParse, llc);
          return ii !== -1 ? ii : null;
        } else if (format === 'ddd') {
          ii = indexOf.call(this._shortWeekdaysParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._weekdaysParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._minWeekdaysParse, llc);
          return ii !== -1 ? ii : null;
        } else {
          ii = indexOf.call(this._minWeekdaysParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._weekdaysParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._shortWeekdaysParse, llc);
          return ii !== -1 ? ii : null;
        }
      }
    }

    function localeWeekdaysParse(weekdayName, format, strict) {
      var i, mom, regex;

      if (this._weekdaysParseExact) {
        return handleStrictParse$1.call(this, weekdayName, format, strict);
      }

      if (!this._weekdaysParse) {
        this._weekdaysParse = [];
        this._minWeekdaysParse = [];
        this._shortWeekdaysParse = [];
        this._fullWeekdaysParse = [];
      }

      for (i = 0; i < 7; i++) {
        // make the regex if we don't have it already
        mom = createUTC([2000, 1]).day(i);

        if (strict && !this._fullWeekdaysParse[i]) {
          this._fullWeekdaysParse[i] = new RegExp('^' + this.weekdays(mom, '').replace('.', '\\.?') + '$', 'i');
          this._shortWeekdaysParse[i] = new RegExp('^' + this.weekdaysShort(mom, '').replace('.', '\\.?') + '$', 'i');
          this._minWeekdaysParse[i] = new RegExp('^' + this.weekdaysMin(mom, '').replace('.', '\\.?') + '$', 'i');
        }

        if (!this._weekdaysParse[i]) {
          regex = '^' + this.weekdays(mom, '') + '|^' + this.weekdaysShort(mom, '') + '|^' + this.weekdaysMin(mom, '');
          this._weekdaysParse[i] = new RegExp(regex.replace('.', ''), 'i');
        } // test the regex


        if (strict && format === 'dddd' && this._fullWeekdaysParse[i].test(weekdayName)) {
          return i;
        } else if (strict && format === 'ddd' && this._shortWeekdaysParse[i].test(weekdayName)) {
          return i;
        } else if (strict && format === 'dd' && this._minWeekdaysParse[i].test(weekdayName)) {
          return i;
        } else if (!strict && this._weekdaysParse[i].test(weekdayName)) {
          return i;
        }
      }
    } // MOMENTS


    function getSetDayOfWeek(input) {
      if (!this.isValid()) {
        return input != null ? this : NaN;
      }

      var day = this._isUTC ? this._d.getUTCDay() : this._d.getDay();

      if (input != null) {
        input = parseWeekday(input, this.localeData());
        return this.add(input - day, 'd');
      } else {
        return day;
      }
    }

    function getSetLocaleDayOfWeek(input) {
      if (!this.isValid()) {
        return input != null ? this : NaN;
      }

      var weekday = (this.day() + 7 - this.localeData()._week.dow) % 7;
      return input == null ? weekday : this.add(input - weekday, 'd');
    }

    function getSetISODayOfWeek(input) {
      if (!this.isValid()) {
        return input != null ? this : NaN;
      } // behaves the same as moment#day except
      // as a getter, returns 7 instead of 0 (1-7 range instead of 0-6)
      // as a setter, sunday should belong to the previous week.


      if (input != null) {
        var weekday = parseIsoWeekday(input, this.localeData());
        return this.day(this.day() % 7 ? weekday : weekday - 7);
      } else {
        return this.day() || 7;
      }
    }

    var defaultWeekdaysRegex = matchWord;

    function weekdaysRegex(isStrict) {
      if (this._weekdaysParseExact) {
        if (!hasOwnProp(this, '_weekdaysRegex')) {
          computeWeekdaysParse.call(this);
        }

        if (isStrict) {
          return this._weekdaysStrictRegex;
        } else {
          return this._weekdaysRegex;
        }
      } else {
        if (!hasOwnProp(this, '_weekdaysRegex')) {
          this._weekdaysRegex = defaultWeekdaysRegex;
        }

        return this._weekdaysStrictRegex && isStrict ? this._weekdaysStrictRegex : this._weekdaysRegex;
      }
    }

    var defaultWeekdaysShortRegex = matchWord;

    function weekdaysShortRegex(isStrict) {
      if (this._weekdaysParseExact) {
        if (!hasOwnProp(this, '_weekdaysRegex')) {
          computeWeekdaysParse.call(this);
        }

        if (isStrict) {
          return this._weekdaysShortStrictRegex;
        } else {
          return this._weekdaysShortRegex;
        }
      } else {
        if (!hasOwnProp(this, '_weekdaysShortRegex')) {
          this._weekdaysShortRegex = defaultWeekdaysShortRegex;
        }

        return this._weekdaysShortStrictRegex && isStrict ? this._weekdaysShortStrictRegex : this._weekdaysShortRegex;
      }
    }

    var defaultWeekdaysMinRegex = matchWord;

    function weekdaysMinRegex(isStrict) {
      if (this._weekdaysParseExact) {
        if (!hasOwnProp(this, '_weekdaysRegex')) {
          computeWeekdaysParse.call(this);
        }

        if (isStrict) {
          return this._weekdaysMinStrictRegex;
        } else {
          return this._weekdaysMinRegex;
        }
      } else {
        if (!hasOwnProp(this, '_weekdaysMinRegex')) {
          this._weekdaysMinRegex = defaultWeekdaysMinRegex;
        }

        return this._weekdaysMinStrictRegex && isStrict ? this._weekdaysMinStrictRegex : this._weekdaysMinRegex;
      }
    }

    function computeWeekdaysParse() {
      function cmpLenRev(a, b) {
        return b.length - a.length;
      }

      var minPieces = [],
          shortPieces = [],
          longPieces = [],
          mixedPieces = [],
          i,
          mom,
          minp,
          shortp,
          longp;

      for (i = 0; i < 7; i++) {
        // make the regex if we don't have it already
        mom = createUTC([2000, 1]).day(i);
        minp = this.weekdaysMin(mom, '');
        shortp = this.weekdaysShort(mom, '');
        longp = this.weekdays(mom, '');
        minPieces.push(minp);
        shortPieces.push(shortp);
        longPieces.push(longp);
        mixedPieces.push(minp);
        mixedPieces.push(shortp);
        mixedPieces.push(longp);
      } // Sorting makes sure if one weekday (or abbr) is a prefix of another it
      // will match the longer piece.


      minPieces.sort(cmpLenRev);
      shortPieces.sort(cmpLenRev);
      longPieces.sort(cmpLenRev);
      mixedPieces.sort(cmpLenRev);

      for (i = 0; i < 7; i++) {
        shortPieces[i] = regexEscape(shortPieces[i]);
        longPieces[i] = regexEscape(longPieces[i]);
        mixedPieces[i] = regexEscape(mixedPieces[i]);
      }

      this._weekdaysRegex = new RegExp('^(' + mixedPieces.join('|') + ')', 'i');
      this._weekdaysShortRegex = this._weekdaysRegex;
      this._weekdaysMinRegex = this._weekdaysRegex;
      this._weekdaysStrictRegex = new RegExp('^(' + longPieces.join('|') + ')', 'i');
      this._weekdaysShortStrictRegex = new RegExp('^(' + shortPieces.join('|') + ')', 'i');
      this._weekdaysMinStrictRegex = new RegExp('^(' + minPieces.join('|') + ')', 'i');
    } // FORMATTING


    function hFormat() {
      return this.hours() % 12 || 12;
    }

    function kFormat() {
      return this.hours() || 24;
    }

    addFormatToken('H', ['HH', 2], 0, 'hour');
    addFormatToken('h', ['hh', 2], 0, hFormat);
    addFormatToken('k', ['kk', 2], 0, kFormat);
    addFormatToken('hmm', 0, 0, function () {
      return '' + hFormat.apply(this) + zeroFill(this.minutes(), 2);
    });
    addFormatToken('hmmss', 0, 0, function () {
      return '' + hFormat.apply(this) + zeroFill(this.minutes(), 2) + zeroFill(this.seconds(), 2);
    });
    addFormatToken('Hmm', 0, 0, function () {
      return '' + this.hours() + zeroFill(this.minutes(), 2);
    });
    addFormatToken('Hmmss', 0, 0, function () {
      return '' + this.hours() + zeroFill(this.minutes(), 2) + zeroFill(this.seconds(), 2);
    });

    function meridiem(token, lowercase) {
      addFormatToken(token, 0, 0, function () {
        return this.localeData().meridiem(this.hours(), this.minutes(), lowercase);
      });
    }

    meridiem('a', true);
    meridiem('A', false); // ALIASES

    addUnitAlias('hour', 'h'); // PRIORITY

    addUnitPriority('hour', 13); // PARSING

    function matchMeridiem(isStrict, locale) {
      return locale._meridiemParse;
    }

    addRegexToken('a', matchMeridiem);
    addRegexToken('A', matchMeridiem);
    addRegexToken('H', match1to2);
    addRegexToken('h', match1to2);
    addRegexToken('k', match1to2);
    addRegexToken('HH', match1to2, match2);
    addRegexToken('hh', match1to2, match2);
    addRegexToken('kk', match1to2, match2);
    addRegexToken('hmm', match3to4);
    addRegexToken('hmmss', match5to6);
    addRegexToken('Hmm', match3to4);
    addRegexToken('Hmmss', match5to6);
    addParseToken(['H', 'HH'], HOUR);
    addParseToken(['k', 'kk'], function (input, array, config) {
      var kInput = toInt(input);
      array[HOUR] = kInput === 24 ? 0 : kInput;
    });
    addParseToken(['a', 'A'], function (input, array, config) {
      config._isPm = config._locale.isPM(input);
      config._meridiem = input;
    });
    addParseToken(['h', 'hh'], function (input, array, config) {
      array[HOUR] = toInt(input);
      getParsingFlags(config).bigHour = true;
    });
    addParseToken('hmm', function (input, array, config) {
      var pos = input.length - 2;
      array[HOUR] = toInt(input.substr(0, pos));
      array[MINUTE] = toInt(input.substr(pos));
      getParsingFlags(config).bigHour = true;
    });
    addParseToken('hmmss', function (input, array, config) {
      var pos1 = input.length - 4;
      var pos2 = input.length - 2;
      array[HOUR] = toInt(input.substr(0, pos1));
      array[MINUTE] = toInt(input.substr(pos1, 2));
      array[SECOND] = toInt(input.substr(pos2));
      getParsingFlags(config).bigHour = true;
    });
    addParseToken('Hmm', function (input, array, config) {
      var pos = input.length - 2;
      array[HOUR] = toInt(input.substr(0, pos));
      array[MINUTE] = toInt(input.substr(pos));
    });
    addParseToken('Hmmss', function (input, array, config) {
      var pos1 = input.length - 4;
      var pos2 = input.length - 2;
      array[HOUR] = toInt(input.substr(0, pos1));
      array[MINUTE] = toInt(input.substr(pos1, 2));
      array[SECOND] = toInt(input.substr(pos2));
    }); // LOCALES

    function localeIsPM(input) {
      // IE8 Quirks Mode & IE7 Standards Mode do not allow accessing strings like arrays
      // Using charAt should be more compatible.
      return (input + '').toLowerCase().charAt(0) === 'p';
    }

    var defaultLocaleMeridiemParse = /[ap]\.?m?\.?/i;

    function localeMeridiem(hours, minutes, isLower) {
      if (hours > 11) {
        return isLower ? 'pm' : 'PM';
      } else {
        return isLower ? 'am' : 'AM';
      }
    } // MOMENTS
    // Setting the hour should keep the time, because the user explicitly
    // specified which hour they want. So trying to maintain the same hour (in
    // a new timezone) makes sense. Adding/subtracting hours does not follow
    // this rule.


    var getSetHour = makeGetSet('Hours', true);
    var baseConfig = {
      calendar: defaultCalendar,
      longDateFormat: defaultLongDateFormat,
      invalidDate: defaultInvalidDate,
      ordinal: defaultOrdinal,
      dayOfMonthOrdinalParse: defaultDayOfMonthOrdinalParse,
      relativeTime: defaultRelativeTime,
      months: defaultLocaleMonths,
      monthsShort: defaultLocaleMonthsShort,
      week: defaultLocaleWeek,
      weekdays: defaultLocaleWeekdays,
      weekdaysMin: defaultLocaleWeekdaysMin,
      weekdaysShort: defaultLocaleWeekdaysShort,
      meridiemParse: defaultLocaleMeridiemParse
    }; // internal storage for locale config files

    var locales = {};
    var localeFamilies = {};
    var globalLocale;

    function normalizeLocale(key) {
      return key ? key.toLowerCase().replace('_', '-') : key;
    } // pick the locale from the array
    // try ['en-au', 'en-gb'] as 'en-au', 'en-gb', 'en', as in move through the list trying each
    // substring from most specific to least, but move to the next array item if it's a more specific variant than the current root


    function chooseLocale(names) {
      var i = 0,
          j,
          next,
          locale,
          split;

      while (i < names.length) {
        split = normalizeLocale(names[i]).split('-');
        j = split.length;
        next = normalizeLocale(names[i + 1]);
        next = next ? next.split('-') : null;

        while (j > 0) {
          locale = loadLocale(split.slice(0, j).join('-'));

          if (locale) {
            return locale;
          }

          if (next && next.length >= j && compareArrays(split, next, true) >= j - 1) {
            //the next array item is better than a shallower substring of this one
            break;
          }

          j--;
        }

        i++;
      }

      return globalLocale;
    }

    function loadLocale(name) {
      var oldLocale = null; // TODO: Find a better way to register and load all the locales in Node

      if (!locales[name] && 'object' !== 'undefined' && module && module.exports) {
        try {
          oldLocale = globalLocale._abbr;
          var aliasedRequire = commonjsRequire;
          aliasedRequire('./locale/' + name);
          getSetGlobalLocale(oldLocale);
        } catch (e) {}
      }

      return locales[name];
    } // This function will load locale and then set the global locale.  If
    // no arguments are passed in, it will simply return the current global
    // locale key.


    function getSetGlobalLocale(key, values) {
      var data;

      if (key) {
        if (isUndefined(values)) {
          data = getLocale(key);
        } else {
          data = defineLocale(key, values);
        }

        if (data) {
          // moment.duration._locale = moment._locale = data;
          globalLocale = data;
        } else {
          if (typeof console !== 'undefined' && console.warn) {
            //warn user if arguments are passed but the locale could not be set
            console.warn('Locale ' + key + ' not found. Did you forget to load it?');
          }
        }
      }

      return globalLocale._abbr;
    }

    function defineLocale(name, config) {
      if (config !== null) {
        var locale,
            parentConfig = baseConfig;
        config.abbr = name;

        if (locales[name] != null) {
          deprecateSimple('defineLocaleOverride', 'use moment.updateLocale(localeName, config) to change ' + 'an existing locale. moment.defineLocale(localeName, ' + 'config) should only be used for creating a new locale ' + 'See http://momentjs.com/guides/#/warnings/define-locale/ for more info.');
          parentConfig = locales[name]._config;
        } else if (config.parentLocale != null) {
          if (locales[config.parentLocale] != null) {
            parentConfig = locales[config.parentLocale]._config;
          } else {
            locale = loadLocale(config.parentLocale);

            if (locale != null) {
              parentConfig = locale._config;
            } else {
              if (!localeFamilies[config.parentLocale]) {
                localeFamilies[config.parentLocale] = [];
              }

              localeFamilies[config.parentLocale].push({
                name: name,
                config: config
              });
              return null;
            }
          }
        }

        locales[name] = new Locale(mergeConfigs(parentConfig, config));

        if (localeFamilies[name]) {
          localeFamilies[name].forEach(function (x) {
            defineLocale(x.name, x.config);
          });
        } // backwards compat for now: also set the locale
        // make sure we set the locale AFTER all child locales have been
        // created, so we won't end up with the child locale set.


        getSetGlobalLocale(name);
        return locales[name];
      } else {
        // useful for testing
        delete locales[name];
        return null;
      }
    }

    function updateLocale(name, config) {
      if (config != null) {
        var locale,
            tmpLocale,
            parentConfig = baseConfig; // MERGE

        tmpLocale = loadLocale(name);

        if (tmpLocale != null) {
          parentConfig = tmpLocale._config;
        }

        config = mergeConfigs(parentConfig, config);
        locale = new Locale(config);
        locale.parentLocale = locales[name];
        locales[name] = locale; // backwards compat for now: also set the locale

        getSetGlobalLocale(name);
      } else {
        // pass null for config to unupdate, useful for tests
        if (locales[name] != null) {
          if (locales[name].parentLocale != null) {
            locales[name] = locales[name].parentLocale;
          } else if (locales[name] != null) {
            delete locales[name];
          }
        }
      }

      return locales[name];
    } // returns locale data


    function getLocale(key) {
      var locale;

      if (key && key._locale && key._locale._abbr) {
        key = key._locale._abbr;
      }

      if (!key) {
        return globalLocale;
      }

      if (!isArray(key)) {
        //short-circuit everything else
        locale = loadLocale(key);

        if (locale) {
          return locale;
        }

        key = [key];
      }

      return chooseLocale(key);
    }

    function listLocales() {
      return keys(locales);
    }

    function checkOverflow(m) {
      var overflow;
      var a = m._a;

      if (a && getParsingFlags(m).overflow === -2) {
        overflow = a[MONTH] < 0 || a[MONTH] > 11 ? MONTH : a[DATE] < 1 || a[DATE] > daysInMonth(a[YEAR], a[MONTH]) ? DATE : a[HOUR] < 0 || a[HOUR] > 24 || a[HOUR] === 24 && (a[MINUTE] !== 0 || a[SECOND] !== 0 || a[MILLISECOND] !== 0) ? HOUR : a[MINUTE] < 0 || a[MINUTE] > 59 ? MINUTE : a[SECOND] < 0 || a[SECOND] > 59 ? SECOND : a[MILLISECOND] < 0 || a[MILLISECOND] > 999 ? MILLISECOND : -1;

        if (getParsingFlags(m)._overflowDayOfYear && (overflow < YEAR || overflow > DATE)) {
          overflow = DATE;
        }

        if (getParsingFlags(m)._overflowWeeks && overflow === -1) {
          overflow = WEEK;
        }

        if (getParsingFlags(m)._overflowWeekday && overflow === -1) {
          overflow = WEEKDAY;
        }

        getParsingFlags(m).overflow = overflow;
      }

      return m;
    } // Pick the first defined of two or three arguments.


    function defaults(a, b, c) {
      if (a != null) {
        return a;
      }

      if (b != null) {
        return b;
      }

      return c;
    }

    function currentDateArray(config) {
      // hooks is actually the exported moment object
      var nowValue = new Date(hooks.now());

      if (config._useUTC) {
        return [nowValue.getUTCFullYear(), nowValue.getUTCMonth(), nowValue.getUTCDate()];
      }

      return [nowValue.getFullYear(), nowValue.getMonth(), nowValue.getDate()];
    } // convert an array to a date.
    // the array should mirror the parameters below
    // note: all values past the year are optional and will default to the lowest possible value.
    // [year, month, day , hour, minute, second, millisecond]


    function configFromArray(config) {
      var i,
          date,
          input = [],
          currentDate,
          expectedWeekday,
          yearToUse;

      if (config._d) {
        return;
      }

      currentDate = currentDateArray(config); //compute day of the year from weeks and weekdays

      if (config._w && config._a[DATE] == null && config._a[MONTH] == null) {
        dayOfYearFromWeekInfo(config);
      } //if the day of the year is set, figure out what it is


      if (config._dayOfYear != null) {
        yearToUse = defaults(config._a[YEAR], currentDate[YEAR]);

        if (config._dayOfYear > daysInYear(yearToUse) || config._dayOfYear === 0) {
          getParsingFlags(config)._overflowDayOfYear = true;
        }

        date = createUTCDate(yearToUse, 0, config._dayOfYear);
        config._a[MONTH] = date.getUTCMonth();
        config._a[DATE] = date.getUTCDate();
      } // Default to current date.
      // * if no year, month, day of month are given, default to today
      // * if day of month is given, default month and year
      // * if month is given, default only year
      // * if year is given, don't default anything


      for (i = 0; i < 3 && config._a[i] == null; ++i) {
        config._a[i] = input[i] = currentDate[i];
      } // Zero out whatever was not defaulted, including time


      for (; i < 7; i++) {
        config._a[i] = input[i] = config._a[i] == null ? i === 2 ? 1 : 0 : config._a[i];
      } // Check for 24:00:00.000


      if (config._a[HOUR] === 24 && config._a[MINUTE] === 0 && config._a[SECOND] === 0 && config._a[MILLISECOND] === 0) {
        config._nextDay = true;
        config._a[HOUR] = 0;
      }

      config._d = (config._useUTC ? createUTCDate : createDate).apply(null, input);
      expectedWeekday = config._useUTC ? config._d.getUTCDay() : config._d.getDay(); // Apply timezone offset from input. The actual utcOffset can be changed
      // with parseZone.

      if (config._tzm != null) {
        config._d.setUTCMinutes(config._d.getUTCMinutes() - config._tzm);
      }

      if (config._nextDay) {
        config._a[HOUR] = 24;
      } // check for mismatching day of week


      if (config._w && typeof config._w.d !== 'undefined' && config._w.d !== expectedWeekday) {
        getParsingFlags(config).weekdayMismatch = true;
      }
    }

    function dayOfYearFromWeekInfo(config) {
      var w, weekYear, week, weekday, dow, doy, temp, weekdayOverflow;
      w = config._w;

      if (w.GG != null || w.W != null || w.E != null) {
        dow = 1;
        doy = 4; // TODO: We need to take the current isoWeekYear, but that depends on
        // how we interpret now (local, utc, fixed offset). So create
        // a now version of current config (take local/utc/offset flags, and
        // create now).

        weekYear = defaults(w.GG, config._a[YEAR], weekOfYear(createLocal(), 1, 4).year);
        week = defaults(w.W, 1);
        weekday = defaults(w.E, 1);

        if (weekday < 1 || weekday > 7) {
          weekdayOverflow = true;
        }
      } else {
        dow = config._locale._week.dow;
        doy = config._locale._week.doy;
        var curWeek = weekOfYear(createLocal(), dow, doy);
        weekYear = defaults(w.gg, config._a[YEAR], curWeek.year); // Default to current week.

        week = defaults(w.w, curWeek.week);

        if (w.d != null) {
          // weekday -- low day numbers are considered next week
          weekday = w.d;

          if (weekday < 0 || weekday > 6) {
            weekdayOverflow = true;
          }
        } else if (w.e != null) {
          // local weekday -- counting starts from beginning of week
          weekday = w.e + dow;

          if (w.e < 0 || w.e > 6) {
            weekdayOverflow = true;
          }
        } else {
          // default to beginning of week
          weekday = dow;
        }
      }

      if (week < 1 || week > weeksInYear(weekYear, dow, doy)) {
        getParsingFlags(config)._overflowWeeks = true;
      } else if (weekdayOverflow != null) {
        getParsingFlags(config)._overflowWeekday = true;
      } else {
        temp = dayOfYearFromWeeks(weekYear, week, weekday, dow, doy);
        config._a[YEAR] = temp.year;
        config._dayOfYear = temp.dayOfYear;
      }
    } // iso 8601 regex
    // 0000-00-00 0000-W00 or 0000-W00-0 + T + 00 or 00:00 or 00:00:00 or 00:00:00.000 + +00:00 or +0000 or +00)


    var extendedIsoRegex = /^\s*((?:[+-]\d{6}|\d{4})-(?:\d\d-\d\d|W\d\d-\d|W\d\d|\d\d\d|\d\d))(?:(T| )(\d\d(?::\d\d(?::\d\d(?:[.,]\d+)?)?)?)([\+\-]\d\d(?::?\d\d)?|\s*Z)?)?$/;
    var basicIsoRegex = /^\s*((?:[+-]\d{6}|\d{4})(?:\d\d\d\d|W\d\d\d|W\d\d|\d\d\d|\d\d))(?:(T| )(\d\d(?:\d\d(?:\d\d(?:[.,]\d+)?)?)?)([\+\-]\d\d(?::?\d\d)?|\s*Z)?)?$/;
    var tzRegex = /Z|[+-]\d\d(?::?\d\d)?/;
    var isoDates = [['YYYYYY-MM-DD', /[+-]\d{6}-\d\d-\d\d/], ['YYYY-MM-DD', /\d{4}-\d\d-\d\d/], ['GGGG-[W]WW-E', /\d{4}-W\d\d-\d/], ['GGGG-[W]WW', /\d{4}-W\d\d/, false], ['YYYY-DDD', /\d{4}-\d{3}/], ['YYYY-MM', /\d{4}-\d\d/, false], ['YYYYYYMMDD', /[+-]\d{10}/], ['YYYYMMDD', /\d{8}/], // YYYYMM is NOT allowed by the standard
    ['GGGG[W]WWE', /\d{4}W\d{3}/], ['GGGG[W]WW', /\d{4}W\d{2}/, false], ['YYYYDDD', /\d{7}/]]; // iso time formats and regexes

    var isoTimes = [['HH:mm:ss.SSSS', /\d\d:\d\d:\d\d\.\d+/], ['HH:mm:ss,SSSS', /\d\d:\d\d:\d\d,\d+/], ['HH:mm:ss', /\d\d:\d\d:\d\d/], ['HH:mm', /\d\d:\d\d/], ['HHmmss.SSSS', /\d\d\d\d\d\d\.\d+/], ['HHmmss,SSSS', /\d\d\d\d\d\d,\d+/], ['HHmmss', /\d\d\d\d\d\d/], ['HHmm', /\d\d\d\d/], ['HH', /\d\d/]];
    var aspNetJsonRegex = /^\/?Date\((\-?\d+)/i; // date from iso format

    function configFromISO(config) {
      var i,
          l,
          string = config._i,
          match = extendedIsoRegex.exec(string) || basicIsoRegex.exec(string),
          allowTime,
          dateFormat,
          timeFormat,
          tzFormat;

      if (match) {
        getParsingFlags(config).iso = true;

        for (i = 0, l = isoDates.length; i < l; i++) {
          if (isoDates[i][1].exec(match[1])) {
            dateFormat = isoDates[i][0];
            allowTime = isoDates[i][2] !== false;
            break;
          }
        }

        if (dateFormat == null) {
          config._isValid = false;
          return;
        }

        if (match[3]) {
          for (i = 0, l = isoTimes.length; i < l; i++) {
            if (isoTimes[i][1].exec(match[3])) {
              // match[2] should be 'T' or space
              timeFormat = (match[2] || ' ') + isoTimes[i][0];
              break;
            }
          }

          if (timeFormat == null) {
            config._isValid = false;
            return;
          }
        }

        if (!allowTime && timeFormat != null) {
          config._isValid = false;
          return;
        }

        if (match[4]) {
          if (tzRegex.exec(match[4])) {
            tzFormat = 'Z';
          } else {
            config._isValid = false;
            return;
          }
        }

        config._f = dateFormat + (timeFormat || '') + (tzFormat || '');
        configFromStringAndFormat(config);
      } else {
        config._isValid = false;
      }
    } // RFC 2822 regex: For details see https://tools.ietf.org/html/rfc2822#section-3.3


    var rfc2822 = /^(?:(Mon|Tue|Wed|Thu|Fri|Sat|Sun),?\s)?(\d{1,2})\s(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s(\d{2,4})\s(\d\d):(\d\d)(?::(\d\d))?\s(?:(UT|GMT|[ECMP][SD]T)|([Zz])|([+-]\d{4}))$/;

    function extractFromRFC2822Strings(yearStr, monthStr, dayStr, hourStr, minuteStr, secondStr) {
      var result = [untruncateYear(yearStr), defaultLocaleMonthsShort.indexOf(monthStr), parseInt(dayStr, 10), parseInt(hourStr, 10), parseInt(minuteStr, 10)];

      if (secondStr) {
        result.push(parseInt(secondStr, 10));
      }

      return result;
    }

    function untruncateYear(yearStr) {
      var year = parseInt(yearStr, 10);

      if (year <= 49) {
        return 2000 + year;
      } else if (year <= 999) {
        return 1900 + year;
      }

      return year;
    }

    function preprocessRFC2822(s) {
      // Remove comments and folding whitespace and replace multiple-spaces with a single space
      return s.replace(/\([^)]*\)|[\n\t]/g, ' ').replace(/(\s\s+)/g, ' ').replace(/^\s\s*/, '').replace(/\s\s*$/, '');
    }

    function checkWeekday(weekdayStr, parsedInput, config) {
      if (weekdayStr) {
        // TODO: Replace the vanilla JS Date object with an indepentent day-of-week check.
        var weekdayProvided = defaultLocaleWeekdaysShort.indexOf(weekdayStr),
            weekdayActual = new Date(parsedInput[0], parsedInput[1], parsedInput[2]).getDay();

        if (weekdayProvided !== weekdayActual) {
          getParsingFlags(config).weekdayMismatch = true;
          config._isValid = false;
          return false;
        }
      }

      return true;
    }

    var obsOffsets = {
      UT: 0,
      GMT: 0,
      EDT: -4 * 60,
      EST: -5 * 60,
      CDT: -5 * 60,
      CST: -6 * 60,
      MDT: -6 * 60,
      MST: -7 * 60,
      PDT: -7 * 60,
      PST: -8 * 60
    };

    function calculateOffset(obsOffset, militaryOffset, numOffset) {
      if (obsOffset) {
        return obsOffsets[obsOffset];
      } else if (militaryOffset) {
        // the only allowed military tz is Z
        return 0;
      } else {
        var hm = parseInt(numOffset, 10);
        var m = hm % 100,
            h = (hm - m) / 100;
        return h * 60 + m;
      }
    } // date and time from ref 2822 format


    function configFromRFC2822(config) {
      var match = rfc2822.exec(preprocessRFC2822(config._i));

      if (match) {
        var parsedArray = extractFromRFC2822Strings(match[4], match[3], match[2], match[5], match[6], match[7]);

        if (!checkWeekday(match[1], parsedArray, config)) {
          return;
        }

        config._a = parsedArray;
        config._tzm = calculateOffset(match[8], match[9], match[10]);
        config._d = createUTCDate.apply(null, config._a);

        config._d.setUTCMinutes(config._d.getUTCMinutes() - config._tzm);

        getParsingFlags(config).rfc2822 = true;
      } else {
        config._isValid = false;
      }
    } // date from iso format or fallback


    function configFromString(config) {
      var matched = aspNetJsonRegex.exec(config._i);

      if (matched !== null) {
        config._d = new Date(+matched[1]);
        return;
      }

      configFromISO(config);

      if (config._isValid === false) {
        delete config._isValid;
      } else {
        return;
      }

      configFromRFC2822(config);

      if (config._isValid === false) {
        delete config._isValid;
      } else {
        return;
      } // Final attempt, use Input Fallback


      hooks.createFromInputFallback(config);
    }

    hooks.createFromInputFallback = deprecate('value provided is not in a recognized RFC2822 or ISO format. moment construction falls back to js Date(), ' + 'which is not reliable across all browsers and versions. Non RFC2822/ISO date formats are ' + 'discouraged and will be removed in an upcoming major release. Please refer to ' + 'http://momentjs.com/guides/#/warnings/js-date/ for more info.', function (config) {
      config._d = new Date(config._i + (config._useUTC ? ' UTC' : ''));
    }); // constant that refers to the ISO standard

    hooks.ISO_8601 = function () {}; // constant that refers to the RFC 2822 form


    hooks.RFC_2822 = function () {}; // date from string and format string


    function configFromStringAndFormat(config) {
      // TODO: Move this to another part of the creation flow to prevent circular deps
      if (config._f === hooks.ISO_8601) {
        configFromISO(config);
        return;
      }

      if (config._f === hooks.RFC_2822) {
        configFromRFC2822(config);
        return;
      }

      config._a = [];
      getParsingFlags(config).empty = true; // This array is used to make a Date, either with `new Date` or `Date.UTC`

      var string = '' + config._i,
          i,
          parsedInput,
          tokens,
          token,
          skipped,
          stringLength = string.length,
          totalParsedInputLength = 0;
      tokens = expandFormat(config._f, config._locale).match(formattingTokens) || [];

      for (i = 0; i < tokens.length; i++) {
        token = tokens[i];
        parsedInput = (string.match(getParseRegexForToken(token, config)) || [])[0]; // console.log('token', token, 'parsedInput', parsedInput,
        //         'regex', getParseRegexForToken(token, config));

        if (parsedInput) {
          skipped = string.substr(0, string.indexOf(parsedInput));

          if (skipped.length > 0) {
            getParsingFlags(config).unusedInput.push(skipped);
          }

          string = string.slice(string.indexOf(parsedInput) + parsedInput.length);
          totalParsedInputLength += parsedInput.length;
        } // don't parse if it's not a known token


        if (formatTokenFunctions[token]) {
          if (parsedInput) {
            getParsingFlags(config).empty = false;
          } else {
            getParsingFlags(config).unusedTokens.push(token);
          }

          addTimeToArrayFromToken(token, parsedInput, config);
        } else if (config._strict && !parsedInput) {
          getParsingFlags(config).unusedTokens.push(token);
        }
      } // add remaining unparsed input length to the string


      getParsingFlags(config).charsLeftOver = stringLength - totalParsedInputLength;

      if (string.length > 0) {
        getParsingFlags(config).unusedInput.push(string);
      } // clear _12h flag if hour is <= 12


      if (config._a[HOUR] <= 12 && getParsingFlags(config).bigHour === true && config._a[HOUR] > 0) {
        getParsingFlags(config).bigHour = undefined;
      }

      getParsingFlags(config).parsedDateParts = config._a.slice(0);
      getParsingFlags(config).meridiem = config._meridiem; // handle meridiem

      config._a[HOUR] = meridiemFixWrap(config._locale, config._a[HOUR], config._meridiem);
      configFromArray(config);
      checkOverflow(config);
    }

    function meridiemFixWrap(locale, hour, meridiem) {
      var isPm;

      if (meridiem == null) {
        // nothing to do
        return hour;
      }

      if (locale.meridiemHour != null) {
        return locale.meridiemHour(hour, meridiem);
      } else if (locale.isPM != null) {
        // Fallback
        isPm = locale.isPM(meridiem);

        if (isPm && hour < 12) {
          hour += 12;
        }

        if (!isPm && hour === 12) {
          hour = 0;
        }

        return hour;
      } else {
        // this is not supposed to happen
        return hour;
      }
    } // date from string and array of format strings


    function configFromStringAndArray(config) {
      var tempConfig, bestMoment, scoreToBeat, i, currentScore;

      if (config._f.length === 0) {
        getParsingFlags(config).invalidFormat = true;
        config._d = new Date(NaN);
        return;
      }

      for (i = 0; i < config._f.length; i++) {
        currentScore = 0;
        tempConfig = copyConfig({}, config);

        if (config._useUTC != null) {
          tempConfig._useUTC = config._useUTC;
        }

        tempConfig._f = config._f[i];
        configFromStringAndFormat(tempConfig);

        if (!isValid(tempConfig)) {
          continue;
        } // if there is any input that was not parsed add a penalty for that format


        currentScore += getParsingFlags(tempConfig).charsLeftOver; //or tokens

        currentScore += getParsingFlags(tempConfig).unusedTokens.length * 10;
        getParsingFlags(tempConfig).score = currentScore;

        if (scoreToBeat == null || currentScore < scoreToBeat) {
          scoreToBeat = currentScore;
          bestMoment = tempConfig;
        }
      }

      extend(config, bestMoment || tempConfig);
    }

    function configFromObject(config) {
      if (config._d) {
        return;
      }

      var i = normalizeObjectUnits(config._i);
      config._a = map([i.year, i.month, i.day || i.date, i.hour, i.minute, i.second, i.millisecond], function (obj) {
        return obj && parseInt(obj, 10);
      });
      configFromArray(config);
    }

    function createFromConfig(config) {
      var res = new Moment(checkOverflow(prepareConfig(config)));

      if (res._nextDay) {
        // Adding is smart enough around DST
        res.add(1, 'd');
        res._nextDay = undefined;
      }

      return res;
    }

    function prepareConfig(config) {
      var input = config._i,
          format = config._f;
      config._locale = config._locale || getLocale(config._l);

      if (input === null || format === undefined && input === '') {
        return createInvalid({
          nullInput: true
        });
      }

      if (typeof input === 'string') {
        config._i = input = config._locale.preparse(input);
      }

      if (isMoment(input)) {
        return new Moment(checkOverflow(input));
      } else if (isDate(input)) {
        config._d = input;
      } else if (isArray(format)) {
        configFromStringAndArray(config);
      } else if (format) {
        configFromStringAndFormat(config);
      } else {
        configFromInput(config);
      }

      if (!isValid(config)) {
        config._d = null;
      }

      return config;
    }

    function configFromInput(config) {
      var input = config._i;

      if (isUndefined(input)) {
        config._d = new Date(hooks.now());
      } else if (isDate(input)) {
        config._d = new Date(input.valueOf());
      } else if (typeof input === 'string') {
        configFromString(config);
      } else if (isArray(input)) {
        config._a = map(input.slice(0), function (obj) {
          return parseInt(obj, 10);
        });
        configFromArray(config);
      } else if (isObject(input)) {
        configFromObject(config);
      } else if (isNumber(input)) {
        // from milliseconds
        config._d = new Date(input);
      } else {
        hooks.createFromInputFallback(config);
      }
    }

    function createLocalOrUTC(input, format, locale, strict, isUTC) {
      var c = {};

      if (locale === true || locale === false) {
        strict = locale;
        locale = undefined;
      }

      if (isObject(input) && isObjectEmpty(input) || isArray(input) && input.length === 0) {
        input = undefined;
      } // object construction must be done this way.
      // https://github.com/moment/moment/issues/1423


      c._isAMomentObject = true;
      c._useUTC = c._isUTC = isUTC;
      c._l = locale;
      c._i = input;
      c._f = format;
      c._strict = strict;
      return createFromConfig(c);
    }

    function createLocal(input, format, locale, strict) {
      return createLocalOrUTC(input, format, locale, strict, false);
    }

    var prototypeMin = deprecate('moment().min is deprecated, use moment.max instead. http://momentjs.com/guides/#/warnings/min-max/', function () {
      var other = createLocal.apply(null, arguments);

      if (this.isValid() && other.isValid()) {
        return other < this ? this : other;
      } else {
        return createInvalid();
      }
    });
    var prototypeMax = deprecate('moment().max is deprecated, use moment.min instead. http://momentjs.com/guides/#/warnings/min-max/', function () {
      var other = createLocal.apply(null, arguments);

      if (this.isValid() && other.isValid()) {
        return other > this ? this : other;
      } else {
        return createInvalid();
      }
    }); // Pick a moment m from moments so that m[fn](other) is true for all
    // other. This relies on the function fn to be transitive.
    //
    // moments should either be an array of moment objects or an array, whose
    // first element is an array of moment objects.

    function pickBy(fn, moments) {
      var res, i;

      if (moments.length === 1 && isArray(moments[0])) {
        moments = moments[0];
      }

      if (!moments.length) {
        return createLocal();
      }

      res = moments[0];

      for (i = 1; i < moments.length; ++i) {
        if (!moments[i].isValid() || moments[i][fn](res)) {
          res = moments[i];
        }
      }

      return res;
    } // TODO: Use [].sort instead?


    function min() {
      var args = [].slice.call(arguments, 0);
      return pickBy('isBefore', args);
    }

    function max() {
      var args = [].slice.call(arguments, 0);
      return pickBy('isAfter', args);
    }

    var now = function () {
      return Date.now ? Date.now() : +new Date();
    };

    var ordering = ['year', 'quarter', 'month', 'week', 'day', 'hour', 'minute', 'second', 'millisecond'];

    function isDurationValid(m) {
      for (var key in m) {
        if (!(indexOf.call(ordering, key) !== -1 && (m[key] == null || !isNaN(m[key])))) {
          return false;
        }
      }

      var unitHasDecimal = false;

      for (var i = 0; i < ordering.length; ++i) {
        if (m[ordering[i]]) {
          if (unitHasDecimal) {
            return false; // only allow non-integers for smallest unit
          }

          if (parseFloat(m[ordering[i]]) !== toInt(m[ordering[i]])) {
            unitHasDecimal = true;
          }
        }
      }

      return true;
    }

    function isValid$1() {
      return this._isValid;
    }

    function createInvalid$1() {
      return createDuration(NaN);
    }

    function Duration(duration) {
      var normalizedInput = normalizeObjectUnits(duration),
          years = normalizedInput.year || 0,
          quarters = normalizedInput.quarter || 0,
          months = normalizedInput.month || 0,
          weeks = normalizedInput.week || normalizedInput.isoWeek || 0,
          days = normalizedInput.day || 0,
          hours = normalizedInput.hour || 0,
          minutes = normalizedInput.minute || 0,
          seconds = normalizedInput.second || 0,
          milliseconds = normalizedInput.millisecond || 0;
      this._isValid = isDurationValid(normalizedInput); // representation for dateAddRemove

      this._milliseconds = +milliseconds + seconds * 1e3 + // 1000
      minutes * 6e4 + // 1000 * 60
      hours * 1000 * 60 * 60; //using 1000 * 60 * 60 instead of 36e5 to avoid floating point rounding errors https://github.com/moment/moment/issues/2978
      // Because of dateAddRemove treats 24 hours as different from a
      // day when working around DST, we need to store them separately

      this._days = +days + weeks * 7; // It is impossible to translate months into days without knowing
      // which months you are are talking about, so we have to store
      // it separately.

      this._months = +months + quarters * 3 + years * 12;
      this._data = {};
      this._locale = getLocale();

      this._bubble();
    }

    function isDuration(obj) {
      return obj instanceof Duration;
    }

    function absRound(number) {
      if (number < 0) {
        return Math.round(-1 * number) * -1;
      } else {
        return Math.round(number);
      }
    } // FORMATTING


    function offset(token, separator) {
      addFormatToken(token, 0, 0, function () {
        var offset = this.utcOffset();
        var sign = '+';

        if (offset < 0) {
          offset = -offset;
          sign = '-';
        }

        return sign + zeroFill(~~(offset / 60), 2) + separator + zeroFill(~~offset % 60, 2);
      });
    }

    offset('Z', ':');
    offset('ZZ', ''); // PARSING

    addRegexToken('Z', matchShortOffset);
    addRegexToken('ZZ', matchShortOffset);
    addParseToken(['Z', 'ZZ'], function (input, array, config) {
      config._useUTC = true;
      config._tzm = offsetFromString(matchShortOffset, input);
    }); // HELPERS
    // timezone chunker
    // '+10:00' > ['10',  '00']
    // '-1530'  > ['-15', '30']

    var chunkOffset = /([\+\-]|\d\d)/gi;

    function offsetFromString(matcher, string) {
      var matches = (string || '').match(matcher);

      if (matches === null) {
        return null;
      }

      var chunk = matches[matches.length - 1] || [];
      var parts = (chunk + '').match(chunkOffset) || ['-', 0, 0];
      var minutes = +(parts[1] * 60) + toInt(parts[2]);
      return minutes === 0 ? 0 : parts[0] === '+' ? minutes : -minutes;
    } // Return a moment from input, that is local/utc/zone equivalent to model.


    function cloneWithOffset(input, model) {
      var res, diff;

      if (model._isUTC) {
        res = model.clone();
        diff = (isMoment(input) || isDate(input) ? input.valueOf() : createLocal(input).valueOf()) - res.valueOf(); // Use low-level api, because this fn is low-level api.

        res._d.setTime(res._d.valueOf() + diff);

        hooks.updateOffset(res, false);
        return res;
      } else {
        return createLocal(input).local();
      }
    }

    function getDateOffset(m) {
      // On Firefox.24 Date#getTimezoneOffset returns a floating point.
      // https://github.com/moment/moment/pull/1871
      return -Math.round(m._d.getTimezoneOffset() / 15) * 15;
    } // HOOKS
    // This function will be called whenever a moment is mutated.
    // It is intended to keep the offset in sync with the timezone.


    hooks.updateOffset = function () {}; // MOMENTS
    // keepLocalTime = true means only change the timezone, without
    // affecting the local hour. So 5:31:26 +0300 --[utcOffset(2, true)]-->
    // 5:31:26 +0200 It is possible that 5:31:26 doesn't exist with offset
    // +0200, so we adjust the time as needed, to be valid.
    //
    // Keeping the time actually adds/subtracts (one hour)
    // from the actual represented time. That is why we call updateOffset
    // a second time. In case it wants us to change the offset again
    // _changeInProgress == true case, then we have to adjust, because
    // there is no such time in the given timezone.


    function getSetOffset(input, keepLocalTime, keepMinutes) {
      var offset = this._offset || 0,
          localAdjust;

      if (!this.isValid()) {
        return input != null ? this : NaN;
      }

      if (input != null) {
        if (typeof input === 'string') {
          input = offsetFromString(matchShortOffset, input);

          if (input === null) {
            return this;
          }
        } else if (Math.abs(input) < 16 && !keepMinutes) {
          input = input * 60;
        }

        if (!this._isUTC && keepLocalTime) {
          localAdjust = getDateOffset(this);
        }

        this._offset = input;
        this._isUTC = true;

        if (localAdjust != null) {
          this.add(localAdjust, 'm');
        }

        if (offset !== input) {
          if (!keepLocalTime || this._changeInProgress) {
            addSubtract(this, createDuration(input - offset, 'm'), 1, false);
          } else if (!this._changeInProgress) {
            this._changeInProgress = true;
            hooks.updateOffset(this, true);
            this._changeInProgress = null;
          }
        }

        return this;
      } else {
        return this._isUTC ? offset : getDateOffset(this);
      }
    }

    function getSetZone(input, keepLocalTime) {
      if (input != null) {
        if (typeof input !== 'string') {
          input = -input;
        }

        this.utcOffset(input, keepLocalTime);
        return this;
      } else {
        return -this.utcOffset();
      }
    }

    function setOffsetToUTC(keepLocalTime) {
      return this.utcOffset(0, keepLocalTime);
    }

    function setOffsetToLocal(keepLocalTime) {
      if (this._isUTC) {
        this.utcOffset(0, keepLocalTime);
        this._isUTC = false;

        if (keepLocalTime) {
          this.subtract(getDateOffset(this), 'm');
        }
      }

      return this;
    }

    function setOffsetToParsedOffset() {
      if (this._tzm != null) {
        this.utcOffset(this._tzm, false, true);
      } else if (typeof this._i === 'string') {
        var tZone = offsetFromString(matchOffset, this._i);

        if (tZone != null) {
          this.utcOffset(tZone);
        } else {
          this.utcOffset(0, true);
        }
      }

      return this;
    }

    function hasAlignedHourOffset(input) {
      if (!this.isValid()) {
        return false;
      }

      input = input ? createLocal(input).utcOffset() : 0;
      return (this.utcOffset() - input) % 60 === 0;
    }

    function isDaylightSavingTime() {
      return this.utcOffset() > this.clone().month(0).utcOffset() || this.utcOffset() > this.clone().month(5).utcOffset();
    }

    function isDaylightSavingTimeShifted() {
      if (!isUndefined(this._isDSTShifted)) {
        return this._isDSTShifted;
      }

      var c = {};
      copyConfig(c, this);
      c = prepareConfig(c);

      if (c._a) {
        var other = c._isUTC ? createUTC(c._a) : createLocal(c._a);
        this._isDSTShifted = this.isValid() && compareArrays(c._a, other.toArray()) > 0;
      } else {
        this._isDSTShifted = false;
      }

      return this._isDSTShifted;
    }

    function isLocal() {
      return this.isValid() ? !this._isUTC : false;
    }

    function isUtcOffset() {
      return this.isValid() ? this._isUTC : false;
    }

    function isUtc() {
      return this.isValid() ? this._isUTC && this._offset === 0 : false;
    } // ASP.NET json date format regex


    var aspNetRegex = /^(\-|\+)?(?:(\d*)[. ])?(\d+)\:(\d+)(?:\:(\d+)(\.\d*)?)?$/; // from http://docs.closure-library.googlecode.com/git/closure_goog_date_date.js.source.html
    // somewhat more in line with 4.4.3.2 2004 spec, but allows decimal anywhere
    // and further modified to allow for strings containing both week and day

    var isoRegex = /^(-|\+)?P(?:([-+]?[0-9,.]*)Y)?(?:([-+]?[0-9,.]*)M)?(?:([-+]?[0-9,.]*)W)?(?:([-+]?[0-9,.]*)D)?(?:T(?:([-+]?[0-9,.]*)H)?(?:([-+]?[0-9,.]*)M)?(?:([-+]?[0-9,.]*)S)?)?$/;

    function createDuration(input, key) {
      var duration = input,
          // matching against regexp is expensive, do it on demand
      match = null,
          sign,
          ret,
          diffRes;

      if (isDuration(input)) {
        duration = {
          ms: input._milliseconds,
          d: input._days,
          M: input._months
        };
      } else if (isNumber(input)) {
        duration = {};

        if (key) {
          duration[key] = input;
        } else {
          duration.milliseconds = input;
        }
      } else if (!!(match = aspNetRegex.exec(input))) {
        sign = match[1] === '-' ? -1 : 1;
        duration = {
          y: 0,
          d: toInt(match[DATE]) * sign,
          h: toInt(match[HOUR]) * sign,
          m: toInt(match[MINUTE]) * sign,
          s: toInt(match[SECOND]) * sign,
          ms: toInt(absRound(match[MILLISECOND] * 1000)) * sign // the millisecond decimal point is included in the match

        };
      } else if (!!(match = isoRegex.exec(input))) {
        sign = match[1] === '-' ? -1 : 1;
        duration = {
          y: parseIso(match[2], sign),
          M: parseIso(match[3], sign),
          w: parseIso(match[4], sign),
          d: parseIso(match[5], sign),
          h: parseIso(match[6], sign),
          m: parseIso(match[7], sign),
          s: parseIso(match[8], sign)
        };
      } else if (duration == null) {
        // checks for null or undefined
        duration = {};
      } else if (typeof duration === 'object' && ('from' in duration || 'to' in duration)) {
        diffRes = momentsDifference(createLocal(duration.from), createLocal(duration.to));
        duration = {};
        duration.ms = diffRes.milliseconds;
        duration.M = diffRes.months;
      }

      ret = new Duration(duration);

      if (isDuration(input) && hasOwnProp(input, '_locale')) {
        ret._locale = input._locale;
      }

      return ret;
    }

    createDuration.fn = Duration.prototype;
    createDuration.invalid = createInvalid$1;

    function parseIso(inp, sign) {
      // We'd normally use ~~inp for this, but unfortunately it also
      // converts floats to ints.
      // inp may be undefined, so careful calling replace on it.
      var res = inp && parseFloat(inp.replace(',', '.')); // apply sign while we're at it

      return (isNaN(res) ? 0 : res) * sign;
    }

    function positiveMomentsDifference(base, other) {
      var res = {};
      res.months = other.month() - base.month() + (other.year() - base.year()) * 12;

      if (base.clone().add(res.months, 'M').isAfter(other)) {
        --res.months;
      }

      res.milliseconds = +other - +base.clone().add(res.months, 'M');
      return res;
    }

    function momentsDifference(base, other) {
      var res;

      if (!(base.isValid() && other.isValid())) {
        return {
          milliseconds: 0,
          months: 0
        };
      }

      other = cloneWithOffset(other, base);

      if (base.isBefore(other)) {
        res = positiveMomentsDifference(base, other);
      } else {
        res = positiveMomentsDifference(other, base);
        res.milliseconds = -res.milliseconds;
        res.months = -res.months;
      }

      return res;
    } // TODO: remove 'name' arg after deprecation is removed


    function createAdder(direction, name) {
      return function (val, period) {
        var dur, tmp; //invert the arguments, but complain about it

        if (period !== null && !isNaN(+period)) {
          deprecateSimple(name, 'moment().' + name + '(period, number) is deprecated. Please use moment().' + name + '(number, period). ' + 'See http://momentjs.com/guides/#/warnings/add-inverted-param/ for more info.');
          tmp = val;
          val = period;
          period = tmp;
        }

        val = typeof val === 'string' ? +val : val;
        dur = createDuration(val, period);
        addSubtract(this, dur, direction);
        return this;
      };
    }

    function addSubtract(mom, duration, isAdding, updateOffset) {
      var milliseconds = duration._milliseconds,
          days = absRound(duration._days),
          months = absRound(duration._months);

      if (!mom.isValid()) {
        // No op
        return;
      }

      updateOffset = updateOffset == null ? true : updateOffset;

      if (months) {
        setMonth(mom, get(mom, 'Month') + months * isAdding);
      }

      if (days) {
        set$1(mom, 'Date', get(mom, 'Date') + days * isAdding);
      }

      if (milliseconds) {
        mom._d.setTime(mom._d.valueOf() + milliseconds * isAdding);
      }

      if (updateOffset) {
        hooks.updateOffset(mom, days || months);
      }
    }

    var add = createAdder(1, 'add');
    var subtract = createAdder(-1, 'subtract');

    function getCalendarFormat(myMoment, now) {
      var diff = myMoment.diff(now, 'days', true);
      return diff < -6 ? 'sameElse' : diff < -1 ? 'lastWeek' : diff < 0 ? 'lastDay' : diff < 1 ? 'sameDay' : diff < 2 ? 'nextDay' : diff < 7 ? 'nextWeek' : 'sameElse';
    }

    function calendar$1(time, formats) {
      // We want to compare the start of today, vs this.
      // Getting start-of-today depends on whether we're local/utc/offset or not.
      var now = time || createLocal(),
          sod = cloneWithOffset(now, this).startOf('day'),
          format = hooks.calendarFormat(this, sod) || 'sameElse';
      var output = formats && (isFunction(formats[format]) ? formats[format].call(this, now) : formats[format]);
      return this.format(output || this.localeData().calendar(format, this, createLocal(now)));
    }

    function clone() {
      return new Moment(this);
    }

    function isAfter(input, units) {
      var localInput = isMoment(input) ? input : createLocal(input);

      if (!(this.isValid() && localInput.isValid())) {
        return false;
      }

      units = normalizeUnits(units) || 'millisecond';

      if (units === 'millisecond') {
        return this.valueOf() > localInput.valueOf();
      } else {
        return localInput.valueOf() < this.clone().startOf(units).valueOf();
      }
    }

    function isBefore(input, units) {
      var localInput = isMoment(input) ? input : createLocal(input);

      if (!(this.isValid() && localInput.isValid())) {
        return false;
      }

      units = normalizeUnits(units) || 'millisecond';

      if (units === 'millisecond') {
        return this.valueOf() < localInput.valueOf();
      } else {
        return this.clone().endOf(units).valueOf() < localInput.valueOf();
      }
    }

    function isBetween(from, to, units, inclusivity) {
      var localFrom = isMoment(from) ? from : createLocal(from),
          localTo = isMoment(to) ? to : createLocal(to);

      if (!(this.isValid() && localFrom.isValid() && localTo.isValid())) {
        return false;
      }

      inclusivity = inclusivity || '()';
      return (inclusivity[0] === '(' ? this.isAfter(localFrom, units) : !this.isBefore(localFrom, units)) && (inclusivity[1] === ')' ? this.isBefore(localTo, units) : !this.isAfter(localTo, units));
    }

    function isSame(input, units) {
      var localInput = isMoment(input) ? input : createLocal(input),
          inputMs;

      if (!(this.isValid() && localInput.isValid())) {
        return false;
      }

      units = normalizeUnits(units) || 'millisecond';

      if (units === 'millisecond') {
        return this.valueOf() === localInput.valueOf();
      } else {
        inputMs = localInput.valueOf();
        return this.clone().startOf(units).valueOf() <= inputMs && inputMs <= this.clone().endOf(units).valueOf();
      }
    }

    function isSameOrAfter(input, units) {
      return this.isSame(input, units) || this.isAfter(input, units);
    }

    function isSameOrBefore(input, units) {
      return this.isSame(input, units) || this.isBefore(input, units);
    }

    function diff(input, units, asFloat) {
      var that, zoneDelta, output;

      if (!this.isValid()) {
        return NaN;
      }

      that = cloneWithOffset(input, this);

      if (!that.isValid()) {
        return NaN;
      }

      zoneDelta = (that.utcOffset() - this.utcOffset()) * 6e4;
      units = normalizeUnits(units);

      switch (units) {
        case 'year':
          output = monthDiff(this, that) / 12;
          break;

        case 'month':
          output = monthDiff(this, that);
          break;

        case 'quarter':
          output = monthDiff(this, that) / 3;
          break;

        case 'second':
          output = (this - that) / 1e3;
          break;
        // 1000

        case 'minute':
          output = (this - that) / 6e4;
          break;
        // 1000 * 60

        case 'hour':
          output = (this - that) / 36e5;
          break;
        // 1000 * 60 * 60

        case 'day':
          output = (this - that - zoneDelta) / 864e5;
          break;
        // 1000 * 60 * 60 * 24, negate dst

        case 'week':
          output = (this - that - zoneDelta) / 6048e5;
          break;
        // 1000 * 60 * 60 * 24 * 7, negate dst

        default:
          output = this - that;
      }

      return asFloat ? output : absFloor(output);
    }

    function monthDiff(a, b) {
      // difference in months
      var wholeMonthDiff = (b.year() - a.year()) * 12 + (b.month() - a.month()),
          // b is in (anchor - 1 month, anchor + 1 month)
      anchor = a.clone().add(wholeMonthDiff, 'months'),
          anchor2,
          adjust;

      if (b - anchor < 0) {
        anchor2 = a.clone().add(wholeMonthDiff - 1, 'months'); // linear across the month

        adjust = (b - anchor) / (anchor - anchor2);
      } else {
        anchor2 = a.clone().add(wholeMonthDiff + 1, 'months'); // linear across the month

        adjust = (b - anchor) / (anchor2 - anchor);
      } //check for negative zero, return zero if negative zero


      return -(wholeMonthDiff + adjust) || 0;
    }

    hooks.defaultFormat = 'YYYY-MM-DDTHH:mm:ssZ';
    hooks.defaultFormatUtc = 'YYYY-MM-DDTHH:mm:ss[Z]';

    function toString() {
      return this.clone().locale('en').format('ddd MMM DD YYYY HH:mm:ss [GMT]ZZ');
    }

    function toISOString(keepOffset) {
      if (!this.isValid()) {
        return null;
      }

      var utc = keepOffset !== true;
      var m = utc ? this.clone().utc() : this;

      if (m.year() < 0 || m.year() > 9999) {
        return formatMoment(m, utc ? 'YYYYYY-MM-DD[T]HH:mm:ss.SSS[Z]' : 'YYYYYY-MM-DD[T]HH:mm:ss.SSSZ');
      }

      if (isFunction(Date.prototype.toISOString)) {
        // native implementation is ~50x faster, use it when we can
        if (utc) {
          return this.toDate().toISOString();
        } else {
          return new Date(this.valueOf() + this.utcOffset() * 60 * 1000).toISOString().replace('Z', formatMoment(m, 'Z'));
        }
      }

      return formatMoment(m, utc ? 'YYYY-MM-DD[T]HH:mm:ss.SSS[Z]' : 'YYYY-MM-DD[T]HH:mm:ss.SSSZ');
    }
    /**
     * Return a human readable representation of a moment that can
     * also be evaluated to get a new moment which is the same
     *
     * @link https://nodejs.org/dist/latest/docs/api/util.html#util_custom_inspect_function_on_objects
     */


    function inspect() {
      if (!this.isValid()) {
        return 'moment.invalid(/* ' + this._i + ' */)';
      }

      var func = 'moment';
      var zone = '';

      if (!this.isLocal()) {
        func = this.utcOffset() === 0 ? 'moment.utc' : 'moment.parseZone';
        zone = 'Z';
      }

      var prefix = '[' + func + '("]';
      var year = 0 <= this.year() && this.year() <= 9999 ? 'YYYY' : 'YYYYYY';
      var datetime = '-MM-DD[T]HH:mm:ss.SSS';
      var suffix = zone + '[")]';
      return this.format(prefix + year + datetime + suffix);
    }

    function format(inputString) {
      if (!inputString) {
        inputString = this.isUtc() ? hooks.defaultFormatUtc : hooks.defaultFormat;
      }

      var output = formatMoment(this, inputString);
      return this.localeData().postformat(output);
    }

    function from(time, withoutSuffix) {
      if (this.isValid() && (isMoment(time) && time.isValid() || createLocal(time).isValid())) {
        return createDuration({
          to: this,
          from: time
        }).locale(this.locale()).humanize(!withoutSuffix);
      } else {
        return this.localeData().invalidDate();
      }
    }

    function fromNow(withoutSuffix) {
      return this.from(createLocal(), withoutSuffix);
    }

    function to(time, withoutSuffix) {
      if (this.isValid() && (isMoment(time) && time.isValid() || createLocal(time).isValid())) {
        return createDuration({
          from: this,
          to: time
        }).locale(this.locale()).humanize(!withoutSuffix);
      } else {
        return this.localeData().invalidDate();
      }
    }

    function toNow(withoutSuffix) {
      return this.to(createLocal(), withoutSuffix);
    } // If passed a locale key, it will set the locale for this
    // instance.  Otherwise, it will return the locale configuration
    // variables for this instance.


    function locale(key) {
      var newLocaleData;

      if (key === undefined) {
        return this._locale._abbr;
      } else {
        newLocaleData = getLocale(key);

        if (newLocaleData != null) {
          this._locale = newLocaleData;
        }

        return this;
      }
    }

    var lang = deprecate('moment().lang() is deprecated. Instead, use moment().localeData() to get the language configuration. Use moment().locale() to change languages.', function (key) {
      if (key === undefined) {
        return this.localeData();
      } else {
        return this.locale(key);
      }
    });

    function localeData() {
      return this._locale;
    }

    var MS_PER_SECOND = 1000;
    var MS_PER_MINUTE = 60 * MS_PER_SECOND;
    var MS_PER_HOUR = 60 * MS_PER_MINUTE;
    var MS_PER_400_YEARS = (365 * 400 + 97) * 24 * MS_PER_HOUR; // actual modulo - handles negative numbers (for dates before 1970):

    function mod$1(dividend, divisor) {
      return (dividend % divisor + divisor) % divisor;
    }

    function localStartOfDate(y, m, d) {
      // the date constructor remaps years 0-99 to 1900-1999
      if (y < 100 && y >= 0) {
        // preserve leap years using a full 400 year cycle, then reset
        return new Date(y + 400, m, d) - MS_PER_400_YEARS;
      } else {
        return new Date(y, m, d).valueOf();
      }
    }

    function utcStartOfDate(y, m, d) {
      // Date.UTC remaps years 0-99 to 1900-1999
      if (y < 100 && y >= 0) {
        // preserve leap years using a full 400 year cycle, then reset
        return Date.UTC(y + 400, m, d) - MS_PER_400_YEARS;
      } else {
        return Date.UTC(y, m, d);
      }
    }

    function startOf(units) {
      var time;
      units = normalizeUnits(units);

      if (units === undefined || units === 'millisecond' || !this.isValid()) {
        return this;
      }

      var startOfDate = this._isUTC ? utcStartOfDate : localStartOfDate;

      switch (units) {
        case 'year':
          time = startOfDate(this.year(), 0, 1);
          break;

        case 'quarter':
          time = startOfDate(this.year(), this.month() - this.month() % 3, 1);
          break;

        case 'month':
          time = startOfDate(this.year(), this.month(), 1);
          break;

        case 'week':
          time = startOfDate(this.year(), this.month(), this.date() - this.weekday());
          break;

        case 'isoWeek':
          time = startOfDate(this.year(), this.month(), this.date() - (this.isoWeekday() - 1));
          break;

        case 'day':
        case 'date':
          time = startOfDate(this.year(), this.month(), this.date());
          break;

        case 'hour':
          time = this._d.valueOf();
          time -= mod$1(time + (this._isUTC ? 0 : this.utcOffset() * MS_PER_MINUTE), MS_PER_HOUR);
          break;

        case 'minute':
          time = this._d.valueOf();
          time -= mod$1(time, MS_PER_MINUTE);
          break;

        case 'second':
          time = this._d.valueOf();
          time -= mod$1(time, MS_PER_SECOND);
          break;
      }

      this._d.setTime(time);

      hooks.updateOffset(this, true);
      return this;
    }

    function endOf(units) {
      var time;
      units = normalizeUnits(units);

      if (units === undefined || units === 'millisecond' || !this.isValid()) {
        return this;
      }

      var startOfDate = this._isUTC ? utcStartOfDate : localStartOfDate;

      switch (units) {
        case 'year':
          time = startOfDate(this.year() + 1, 0, 1) - 1;
          break;

        case 'quarter':
          time = startOfDate(this.year(), this.month() - this.month() % 3 + 3, 1) - 1;
          break;

        case 'month':
          time = startOfDate(this.year(), this.month() + 1, 1) - 1;
          break;

        case 'week':
          time = startOfDate(this.year(), this.month(), this.date() - this.weekday() + 7) - 1;
          break;

        case 'isoWeek':
          time = startOfDate(this.year(), this.month(), this.date() - (this.isoWeekday() - 1) + 7) - 1;
          break;

        case 'day':
        case 'date':
          time = startOfDate(this.year(), this.month(), this.date() + 1) - 1;
          break;

        case 'hour':
          time = this._d.valueOf();
          time += MS_PER_HOUR - mod$1(time + (this._isUTC ? 0 : this.utcOffset() * MS_PER_MINUTE), MS_PER_HOUR) - 1;
          break;

        case 'minute':
          time = this._d.valueOf();
          time += MS_PER_MINUTE - mod$1(time, MS_PER_MINUTE) - 1;
          break;

        case 'second':
          time = this._d.valueOf();
          time += MS_PER_SECOND - mod$1(time, MS_PER_SECOND) - 1;
          break;
      }

      this._d.setTime(time);

      hooks.updateOffset(this, true);
      return this;
    }

    function valueOf() {
      return this._d.valueOf() - (this._offset || 0) * 60000;
    }

    function unix() {
      return Math.floor(this.valueOf() / 1000);
    }

    function toDate() {
      return new Date(this.valueOf());
    }

    function toArray() {
      var m = this;
      return [m.year(), m.month(), m.date(), m.hour(), m.minute(), m.second(), m.millisecond()];
    }

    function toObject() {
      var m = this;
      return {
        years: m.year(),
        months: m.month(),
        date: m.date(),
        hours: m.hours(),
        minutes: m.minutes(),
        seconds: m.seconds(),
        milliseconds: m.milliseconds()
      };
    }

    function toJSON() {
      // new Date(NaN).toJSON() === null
      return this.isValid() ? this.toISOString() : null;
    }

    function isValid$2() {
      return isValid(this);
    }

    function parsingFlags() {
      return extend({}, getParsingFlags(this));
    }

    function invalidAt() {
      return getParsingFlags(this).overflow;
    }

    function creationData() {
      return {
        input: this._i,
        format: this._f,
        locale: this._locale,
        isUTC: this._isUTC,
        strict: this._strict
      };
    } // FORMATTING


    addFormatToken(0, ['gg', 2], 0, function () {
      return this.weekYear() % 100;
    });
    addFormatToken(0, ['GG', 2], 0, function () {
      return this.isoWeekYear() % 100;
    });

    function addWeekYearFormatToken(token, getter) {
      addFormatToken(0, [token, token.length], 0, getter);
    }

    addWeekYearFormatToken('gggg', 'weekYear');
    addWeekYearFormatToken('ggggg', 'weekYear');
    addWeekYearFormatToken('GGGG', 'isoWeekYear');
    addWeekYearFormatToken('GGGGG', 'isoWeekYear'); // ALIASES

    addUnitAlias('weekYear', 'gg');
    addUnitAlias('isoWeekYear', 'GG'); // PRIORITY

    addUnitPriority('weekYear', 1);
    addUnitPriority('isoWeekYear', 1); // PARSING

    addRegexToken('G', matchSigned);
    addRegexToken('g', matchSigned);
    addRegexToken('GG', match1to2, match2);
    addRegexToken('gg', match1to2, match2);
    addRegexToken('GGGG', match1to4, match4);
    addRegexToken('gggg', match1to4, match4);
    addRegexToken('GGGGG', match1to6, match6);
    addRegexToken('ggggg', match1to6, match6);
    addWeekParseToken(['gggg', 'ggggg', 'GGGG', 'GGGGG'], function (input, week, config, token) {
      week[token.substr(0, 2)] = toInt(input);
    });
    addWeekParseToken(['gg', 'GG'], function (input, week, config, token) {
      week[token] = hooks.parseTwoDigitYear(input);
    }); // MOMENTS

    function getSetWeekYear(input) {
      return getSetWeekYearHelper.call(this, input, this.week(), this.weekday(), this.localeData()._week.dow, this.localeData()._week.doy);
    }

    function getSetISOWeekYear(input) {
      return getSetWeekYearHelper.call(this, input, this.isoWeek(), this.isoWeekday(), 1, 4);
    }

    function getISOWeeksInYear() {
      return weeksInYear(this.year(), 1, 4);
    }

    function getWeeksInYear() {
      var weekInfo = this.localeData()._week;

      return weeksInYear(this.year(), weekInfo.dow, weekInfo.doy);
    }

    function getSetWeekYearHelper(input, week, weekday, dow, doy) {
      var weeksTarget;

      if (input == null) {
        return weekOfYear(this, dow, doy).year;
      } else {
        weeksTarget = weeksInYear(input, dow, doy);

        if (week > weeksTarget) {
          week = weeksTarget;
        }

        return setWeekAll.call(this, input, week, weekday, dow, doy);
      }
    }

    function setWeekAll(weekYear, week, weekday, dow, doy) {
      var dayOfYearData = dayOfYearFromWeeks(weekYear, week, weekday, dow, doy),
          date = createUTCDate(dayOfYearData.year, 0, dayOfYearData.dayOfYear);
      this.year(date.getUTCFullYear());
      this.month(date.getUTCMonth());
      this.date(date.getUTCDate());
      return this;
    } // FORMATTING


    addFormatToken('Q', 0, 'Qo', 'quarter'); // ALIASES

    addUnitAlias('quarter', 'Q'); // PRIORITY

    addUnitPriority('quarter', 7); // PARSING

    addRegexToken('Q', match1);
    addParseToken('Q', function (input, array) {
      array[MONTH] = (toInt(input) - 1) * 3;
    }); // MOMENTS

    function getSetQuarter(input) {
      return input == null ? Math.ceil((this.month() + 1) / 3) : this.month((input - 1) * 3 + this.month() % 3);
    } // FORMATTING


    addFormatToken('D', ['DD', 2], 'Do', 'date'); // ALIASES

    addUnitAlias('date', 'D'); // PRIORITY

    addUnitPriority('date', 9); // PARSING

    addRegexToken('D', match1to2);
    addRegexToken('DD', match1to2, match2);
    addRegexToken('Do', function (isStrict, locale) {
      // TODO: Remove "ordinalParse" fallback in next major release.
      return isStrict ? locale._dayOfMonthOrdinalParse || locale._ordinalParse : locale._dayOfMonthOrdinalParseLenient;
    });
    addParseToken(['D', 'DD'], DATE);
    addParseToken('Do', function (input, array) {
      array[DATE] = toInt(input.match(match1to2)[0]);
    }); // MOMENTS

    var getSetDayOfMonth = makeGetSet('Date', true); // FORMATTING

    addFormatToken('DDD', ['DDDD', 3], 'DDDo', 'dayOfYear'); // ALIASES

    addUnitAlias('dayOfYear', 'DDD'); // PRIORITY

    addUnitPriority('dayOfYear', 4); // PARSING

    addRegexToken('DDD', match1to3);
    addRegexToken('DDDD', match3);
    addParseToken(['DDD', 'DDDD'], function (input, array, config) {
      config._dayOfYear = toInt(input);
    }); // HELPERS
    // MOMENTS

    function getSetDayOfYear(input) {
      var dayOfYear = Math.round((this.clone().startOf('day') - this.clone().startOf('year')) / 864e5) + 1;
      return input == null ? dayOfYear : this.add(input - dayOfYear, 'd');
    } // FORMATTING


    addFormatToken('m', ['mm', 2], 0, 'minute'); // ALIASES

    addUnitAlias('minute', 'm'); // PRIORITY

    addUnitPriority('minute', 14); // PARSING

    addRegexToken('m', match1to2);
    addRegexToken('mm', match1to2, match2);
    addParseToken(['m', 'mm'], MINUTE); // MOMENTS

    var getSetMinute = makeGetSet('Minutes', false); // FORMATTING

    addFormatToken('s', ['ss', 2], 0, 'second'); // ALIASES

    addUnitAlias('second', 's'); // PRIORITY

    addUnitPriority('second', 15); // PARSING

    addRegexToken('s', match1to2);
    addRegexToken('ss', match1to2, match2);
    addParseToken(['s', 'ss'], SECOND); // MOMENTS

    var getSetSecond = makeGetSet('Seconds', false); // FORMATTING

    addFormatToken('S', 0, 0, function () {
      return ~~(this.millisecond() / 100);
    });
    addFormatToken(0, ['SS', 2], 0, function () {
      return ~~(this.millisecond() / 10);
    });
    addFormatToken(0, ['SSS', 3], 0, 'millisecond');
    addFormatToken(0, ['SSSS', 4], 0, function () {
      return this.millisecond() * 10;
    });
    addFormatToken(0, ['SSSSS', 5], 0, function () {
      return this.millisecond() * 100;
    });
    addFormatToken(0, ['SSSSSS', 6], 0, function () {
      return this.millisecond() * 1000;
    });
    addFormatToken(0, ['SSSSSSS', 7], 0, function () {
      return this.millisecond() * 10000;
    });
    addFormatToken(0, ['SSSSSSSS', 8], 0, function () {
      return this.millisecond() * 100000;
    });
    addFormatToken(0, ['SSSSSSSSS', 9], 0, function () {
      return this.millisecond() * 1000000;
    }); // ALIASES

    addUnitAlias('millisecond', 'ms'); // PRIORITY

    addUnitPriority('millisecond', 16); // PARSING

    addRegexToken('S', match1to3, match1);
    addRegexToken('SS', match1to3, match2);
    addRegexToken('SSS', match1to3, match3);
    var token;

    for (token = 'SSSS'; token.length <= 9; token += 'S') {
      addRegexToken(token, matchUnsigned);
    }

    function parseMs(input, array) {
      array[MILLISECOND] = toInt(('0.' + input) * 1000);
    }

    for (token = 'S'; token.length <= 9; token += 'S') {
      addParseToken(token, parseMs);
    } // MOMENTS


    var getSetMillisecond = makeGetSet('Milliseconds', false); // FORMATTING

    addFormatToken('z', 0, 0, 'zoneAbbr');
    addFormatToken('zz', 0, 0, 'zoneName'); // MOMENTS

    function getZoneAbbr() {
      return this._isUTC ? 'UTC' : '';
    }

    function getZoneName() {
      return this._isUTC ? 'Coordinated Universal Time' : '';
    }

    var proto = Moment.prototype;
    proto.add = add;
    proto.calendar = calendar$1;
    proto.clone = clone;
    proto.diff = diff;
    proto.endOf = endOf;
    proto.format = format;
    proto.from = from;
    proto.fromNow = fromNow;
    proto.to = to;
    proto.toNow = toNow;
    proto.get = stringGet;
    proto.invalidAt = invalidAt;
    proto.isAfter = isAfter;
    proto.isBefore = isBefore;
    proto.isBetween = isBetween;
    proto.isSame = isSame;
    proto.isSameOrAfter = isSameOrAfter;
    proto.isSameOrBefore = isSameOrBefore;
    proto.isValid = isValid$2;
    proto.lang = lang;
    proto.locale = locale;
    proto.localeData = localeData;
    proto.max = prototypeMax;
    proto.min = prototypeMin;
    proto.parsingFlags = parsingFlags;
    proto.set = stringSet;
    proto.startOf = startOf;
    proto.subtract = subtract;
    proto.toArray = toArray;
    proto.toObject = toObject;
    proto.toDate = toDate;
    proto.toISOString = toISOString;
    proto.inspect = inspect;
    proto.toJSON = toJSON;
    proto.toString = toString;
    proto.unix = unix;
    proto.valueOf = valueOf;
    proto.creationData = creationData;
    proto.year = getSetYear;
    proto.isLeapYear = getIsLeapYear;
    proto.weekYear = getSetWeekYear;
    proto.isoWeekYear = getSetISOWeekYear;
    proto.quarter = proto.quarters = getSetQuarter;
    proto.month = getSetMonth;
    proto.daysInMonth = getDaysInMonth;
    proto.week = proto.weeks = getSetWeek;
    proto.isoWeek = proto.isoWeeks = getSetISOWeek;
    proto.weeksInYear = getWeeksInYear;
    proto.isoWeeksInYear = getISOWeeksInYear;
    proto.date = getSetDayOfMonth;
    proto.day = proto.days = getSetDayOfWeek;
    proto.weekday = getSetLocaleDayOfWeek;
    proto.isoWeekday = getSetISODayOfWeek;
    proto.dayOfYear = getSetDayOfYear;
    proto.hour = proto.hours = getSetHour;
    proto.minute = proto.minutes = getSetMinute;
    proto.second = proto.seconds = getSetSecond;
    proto.millisecond = proto.milliseconds = getSetMillisecond;
    proto.utcOffset = getSetOffset;
    proto.utc = setOffsetToUTC;
    proto.local = setOffsetToLocal;
    proto.parseZone = setOffsetToParsedOffset;
    proto.hasAlignedHourOffset = hasAlignedHourOffset;
    proto.isDST = isDaylightSavingTime;
    proto.isLocal = isLocal;
    proto.isUtcOffset = isUtcOffset;
    proto.isUtc = isUtc;
    proto.isUTC = isUtc;
    proto.zoneAbbr = getZoneAbbr;
    proto.zoneName = getZoneName;
    proto.dates = deprecate('dates accessor is deprecated. Use date instead.', getSetDayOfMonth);
    proto.months = deprecate('months accessor is deprecated. Use month instead', getSetMonth);
    proto.years = deprecate('years accessor is deprecated. Use year instead', getSetYear);
    proto.zone = deprecate('moment().zone is deprecated, use moment().utcOffset instead. http://momentjs.com/guides/#/warnings/zone/', getSetZone);
    proto.isDSTShifted = deprecate('isDSTShifted is deprecated. See http://momentjs.com/guides/#/warnings/dst-shifted/ for more information', isDaylightSavingTimeShifted);

    function createUnix(input) {
      return createLocal(input * 1000);
    }

    function createInZone() {
      return createLocal.apply(null, arguments).parseZone();
    }

    function preParsePostFormat(string) {
      return string;
    }

    var proto$1 = Locale.prototype;
    proto$1.calendar = calendar;
    proto$1.longDateFormat = longDateFormat;
    proto$1.invalidDate = invalidDate;
    proto$1.ordinal = ordinal;
    proto$1.preparse = preParsePostFormat;
    proto$1.postformat = preParsePostFormat;
    proto$1.relativeTime = relativeTime;
    proto$1.pastFuture = pastFuture;
    proto$1.set = set;
    proto$1.months = localeMonths;
    proto$1.monthsShort = localeMonthsShort;
    proto$1.monthsParse = localeMonthsParse;
    proto$1.monthsRegex = monthsRegex;
    proto$1.monthsShortRegex = monthsShortRegex;
    proto$1.week = localeWeek;
    proto$1.firstDayOfYear = localeFirstDayOfYear;
    proto$1.firstDayOfWeek = localeFirstDayOfWeek;
    proto$1.weekdays = localeWeekdays;
    proto$1.weekdaysMin = localeWeekdaysMin;
    proto$1.weekdaysShort = localeWeekdaysShort;
    proto$1.weekdaysParse = localeWeekdaysParse;
    proto$1.weekdaysRegex = weekdaysRegex;
    proto$1.weekdaysShortRegex = weekdaysShortRegex;
    proto$1.weekdaysMinRegex = weekdaysMinRegex;
    proto$1.isPM = localeIsPM;
    proto$1.meridiem = localeMeridiem;

    function get$1(format, index, field, setter) {
      var locale = getLocale();
      var utc = createUTC().set(setter, index);
      return locale[field](utc, format);
    }

    function listMonthsImpl(format, index, field) {
      if (isNumber(format)) {
        index = format;
        format = undefined;
      }

      format = format || '';

      if (index != null) {
        return get$1(format, index, field, 'month');
      }

      var i;
      var out = [];

      for (i = 0; i < 12; i++) {
        out[i] = get$1(format, i, field, 'month');
      }

      return out;
    } // ()
    // (5)
    // (fmt, 5)
    // (fmt)
    // (true)
    // (true, 5)
    // (true, fmt, 5)
    // (true, fmt)


    function listWeekdaysImpl(localeSorted, format, index, field) {
      if (typeof localeSorted === 'boolean') {
        if (isNumber(format)) {
          index = format;
          format = undefined;
        }

        format = format || '';
      } else {
        format = localeSorted;
        index = format;
        localeSorted = false;

        if (isNumber(format)) {
          index = format;
          format = undefined;
        }

        format = format || '';
      }

      var locale = getLocale(),
          shift = localeSorted ? locale._week.dow : 0;

      if (index != null) {
        return get$1(format, (index + shift) % 7, field, 'day');
      }

      var i;
      var out = [];

      for (i = 0; i < 7; i++) {
        out[i] = get$1(format, (i + shift) % 7, field, 'day');
      }

      return out;
    }

    function listMonths(format, index) {
      return listMonthsImpl(format, index, 'months');
    }

    function listMonthsShort(format, index) {
      return listMonthsImpl(format, index, 'monthsShort');
    }

    function listWeekdays(localeSorted, format, index) {
      return listWeekdaysImpl(localeSorted, format, index, 'weekdays');
    }

    function listWeekdaysShort(localeSorted, format, index) {
      return listWeekdaysImpl(localeSorted, format, index, 'weekdaysShort');
    }

    function listWeekdaysMin(localeSorted, format, index) {
      return listWeekdaysImpl(localeSorted, format, index, 'weekdaysMin');
    }

    getSetGlobalLocale('en', {
      dayOfMonthOrdinalParse: /\d{1,2}(th|st|nd|rd)/,
      ordinal: function (number) {
        var b = number % 10,
            output = toInt(number % 100 / 10) === 1 ? 'th' : b === 1 ? 'st' : b === 2 ? 'nd' : b === 3 ? 'rd' : 'th';
        return number + output;
      }
    }); // Side effect imports

    hooks.lang = deprecate('moment.lang is deprecated. Use moment.locale instead.', getSetGlobalLocale);
    hooks.langData = deprecate('moment.langData is deprecated. Use moment.localeData instead.', getLocale);
    var mathAbs = Math.abs;

    function abs() {
      var data = this._data;
      this._milliseconds = mathAbs(this._milliseconds);
      this._days = mathAbs(this._days);
      this._months = mathAbs(this._months);
      data.milliseconds = mathAbs(data.milliseconds);
      data.seconds = mathAbs(data.seconds);
      data.minutes = mathAbs(data.minutes);
      data.hours = mathAbs(data.hours);
      data.months = mathAbs(data.months);
      data.years = mathAbs(data.years);
      return this;
    }

    function addSubtract$1(duration, input, value, direction) {
      var other = createDuration(input, value);
      duration._milliseconds += direction * other._milliseconds;
      duration._days += direction * other._days;
      duration._months += direction * other._months;
      return duration._bubble();
    } // supports only 2.0-style add(1, 's') or add(duration)


    function add$1(input, value) {
      return addSubtract$1(this, input, value, 1);
    } // supports only 2.0-style subtract(1, 's') or subtract(duration)


    function subtract$1(input, value) {
      return addSubtract$1(this, input, value, -1);
    }

    function absCeil(number) {
      if (number < 0) {
        return Math.floor(number);
      } else {
        return Math.ceil(number);
      }
    }

    function bubble() {
      var milliseconds = this._milliseconds;
      var days = this._days;
      var months = this._months;
      var data = this._data;
      var seconds, minutes, hours, years, monthsFromDays; // if we have a mix of positive and negative values, bubble down first
      // check: https://github.com/moment/moment/issues/2166

      if (!(milliseconds >= 0 && days >= 0 && months >= 0 || milliseconds <= 0 && days <= 0 && months <= 0)) {
        milliseconds += absCeil(monthsToDays(months) + days) * 864e5;
        days = 0;
        months = 0;
      } // The following code bubbles up values, see the tests for
      // examples of what that means.


      data.milliseconds = milliseconds % 1000;
      seconds = absFloor(milliseconds / 1000);
      data.seconds = seconds % 60;
      minutes = absFloor(seconds / 60);
      data.minutes = minutes % 60;
      hours = absFloor(minutes / 60);
      data.hours = hours % 24;
      days += absFloor(hours / 24); // convert days to months

      monthsFromDays = absFloor(daysToMonths(days));
      months += monthsFromDays;
      days -= absCeil(monthsToDays(monthsFromDays)); // 12 months -> 1 year

      years = absFloor(months / 12);
      months %= 12;
      data.days = days;
      data.months = months;
      data.years = years;
      return this;
    }

    function daysToMonths(days) {
      // 400 years have 146097 days (taking into account leap year rules)
      // 400 years have 12 months === 4800
      return days * 4800 / 146097;
    }

    function monthsToDays(months) {
      // the reverse of daysToMonths
      return months * 146097 / 4800;
    }

    function as(units) {
      if (!this.isValid()) {
        return NaN;
      }

      var days;
      var months;
      var milliseconds = this._milliseconds;
      units = normalizeUnits(units);

      if (units === 'month' || units === 'quarter' || units === 'year') {
        days = this._days + milliseconds / 864e5;
        months = this._months + daysToMonths(days);

        switch (units) {
          case 'month':
            return months;

          case 'quarter':
            return months / 3;

          case 'year':
            return months / 12;
        }
      } else {
        // handle milliseconds separately because of floating point math errors (issue #1867)
        days = this._days + Math.round(monthsToDays(this._months));

        switch (units) {
          case 'week':
            return days / 7 + milliseconds / 6048e5;

          case 'day':
            return days + milliseconds / 864e5;

          case 'hour':
            return days * 24 + milliseconds / 36e5;

          case 'minute':
            return days * 1440 + milliseconds / 6e4;

          case 'second':
            return days * 86400 + milliseconds / 1000;
          // Math.floor prevents floating point math errors here

          case 'millisecond':
            return Math.floor(days * 864e5) + milliseconds;

          default:
            throw new Error('Unknown unit ' + units);
        }
      }
    } // TODO: Use this.as('ms')?


    function valueOf$1() {
      if (!this.isValid()) {
        return NaN;
      }

      return this._milliseconds + this._days * 864e5 + this._months % 12 * 2592e6 + toInt(this._months / 12) * 31536e6;
    }

    function makeAs(alias) {
      return function () {
        return this.as(alias);
      };
    }

    var asMilliseconds = makeAs('ms');
    var asSeconds = makeAs('s');
    var asMinutes = makeAs('m');
    var asHours = makeAs('h');
    var asDays = makeAs('d');
    var asWeeks = makeAs('w');
    var asMonths = makeAs('M');
    var asQuarters = makeAs('Q');
    var asYears = makeAs('y');

    function clone$1() {
      return createDuration(this);
    }

    function get$2(units) {
      units = normalizeUnits(units);
      return this.isValid() ? this[units + 's']() : NaN;
    }

    function makeGetter(name) {
      return function () {
        return this.isValid() ? this._data[name] : NaN;
      };
    }

    var milliseconds = makeGetter('milliseconds');
    var seconds = makeGetter('seconds');
    var minutes = makeGetter('minutes');
    var hours = makeGetter('hours');
    var days = makeGetter('days');
    var months = makeGetter('months');
    var years = makeGetter('years');

    function weeks() {
      return absFloor(this.days() / 7);
    }

    var round = Math.round;
    var thresholds = {
      ss: 44,
      // a few seconds to seconds
      s: 45,
      // seconds to minute
      m: 45,
      // minutes to hour
      h: 22,
      // hours to day
      d: 26,
      // days to month
      M: 11 // months to year

    }; // helper function for moment.fn.from, moment.fn.fromNow, and moment.duration.fn.humanize

    function substituteTimeAgo(string, number, withoutSuffix, isFuture, locale) {
      return locale.relativeTime(number || 1, !!withoutSuffix, string, isFuture);
    }

    function relativeTime$1(posNegDuration, withoutSuffix, locale) {
      var duration = createDuration(posNegDuration).abs();
      var seconds = round(duration.as('s'));
      var minutes = round(duration.as('m'));
      var hours = round(duration.as('h'));
      var days = round(duration.as('d'));
      var months = round(duration.as('M'));
      var years = round(duration.as('y'));
      var a = seconds <= thresholds.ss && ['s', seconds] || seconds < thresholds.s && ['ss', seconds] || minutes <= 1 && ['m'] || minutes < thresholds.m && ['mm', minutes] || hours <= 1 && ['h'] || hours < thresholds.h && ['hh', hours] || days <= 1 && ['d'] || days < thresholds.d && ['dd', days] || months <= 1 && ['M'] || months < thresholds.M && ['MM', months] || years <= 1 && ['y'] || ['yy', years];
      a[2] = withoutSuffix;
      a[3] = +posNegDuration > 0;
      a[4] = locale;
      return substituteTimeAgo.apply(null, a);
    } // This function allows you to set the rounding function for relative time strings


    function getSetRelativeTimeRounding(roundingFunction) {
      if (roundingFunction === undefined) {
        return round;
      }

      if (typeof roundingFunction === 'function') {
        round = roundingFunction;
        return true;
      }

      return false;
    } // This function allows you to set a threshold for relative time strings


    function getSetRelativeTimeThreshold(threshold, limit) {
      if (thresholds[threshold] === undefined) {
        return false;
      }

      if (limit === undefined) {
        return thresholds[threshold];
      }

      thresholds[threshold] = limit;

      if (threshold === 's') {
        thresholds.ss = limit - 1;
      }

      return true;
    }

    function humanize(withSuffix) {
      if (!this.isValid()) {
        return this.localeData().invalidDate();
      }

      var locale = this.localeData();
      var output = relativeTime$1(this, !withSuffix, locale);

      if (withSuffix) {
        output = locale.pastFuture(+this, output);
      }

      return locale.postformat(output);
    }

    var abs$1 = Math.abs;

    function sign(x) {
      return (x > 0) - (x < 0) || +x;
    }

    function toISOString$1() {
      // for ISO strings we do not use the normal bubbling rules:
      //  * milliseconds bubble up until they become hours
      //  * days do not bubble at all
      //  * months bubble up until they become years
      // This is because there is no context-free conversion between hours and days
      // (think of clock changes)
      // and also not between days and months (28-31 days per month)
      if (!this.isValid()) {
        return this.localeData().invalidDate();
      }

      var seconds = abs$1(this._milliseconds) / 1000;
      var days = abs$1(this._days);
      var months = abs$1(this._months);
      var minutes, hours, years; // 3600 seconds -> 60 minutes -> 1 hour

      minutes = absFloor(seconds / 60);
      hours = absFloor(minutes / 60);
      seconds %= 60;
      minutes %= 60; // 12 months -> 1 year

      years = absFloor(months / 12);
      months %= 12; // inspired by https://github.com/dordille/moment-isoduration/blob/master/moment.isoduration.js

      var Y = years;
      var M = months;
      var D = days;
      var h = hours;
      var m = minutes;
      var s = seconds ? seconds.toFixed(3).replace(/\.?0+$/, '') : '';
      var total = this.asSeconds();

      if (!total) {
        // this is the same as C#'s (Noda) and python (isodate)...
        // but not other JS (goog.date)
        return 'P0D';
      }

      var totalSign = total < 0 ? '-' : '';
      var ymSign = sign(this._months) !== sign(total) ? '-' : '';
      var daysSign = sign(this._days) !== sign(total) ? '-' : '';
      var hmsSign = sign(this._milliseconds) !== sign(total) ? '-' : '';
      return totalSign + 'P' + (Y ? ymSign + Y + 'Y' : '') + (M ? ymSign + M + 'M' : '') + (D ? daysSign + D + 'D' : '') + (h || m || s ? 'T' : '') + (h ? hmsSign + h + 'H' : '') + (m ? hmsSign + m + 'M' : '') + (s ? hmsSign + s + 'S' : '');
    }

    var proto$2 = Duration.prototype;
    proto$2.isValid = isValid$1;
    proto$2.abs = abs;
    proto$2.add = add$1;
    proto$2.subtract = subtract$1;
    proto$2.as = as;
    proto$2.asMilliseconds = asMilliseconds;
    proto$2.asSeconds = asSeconds;
    proto$2.asMinutes = asMinutes;
    proto$2.asHours = asHours;
    proto$2.asDays = asDays;
    proto$2.asWeeks = asWeeks;
    proto$2.asMonths = asMonths;
    proto$2.asQuarters = asQuarters;
    proto$2.asYears = asYears;
    proto$2.valueOf = valueOf$1;
    proto$2._bubble = bubble;
    proto$2.clone = clone$1;
    proto$2.get = get$2;
    proto$2.milliseconds = milliseconds;
    proto$2.seconds = seconds;
    proto$2.minutes = minutes;
    proto$2.hours = hours;
    proto$2.days = days;
    proto$2.weeks = weeks;
    proto$2.months = months;
    proto$2.years = years;
    proto$2.humanize = humanize;
    proto$2.toISOString = toISOString$1;
    proto$2.toString = toISOString$1;
    proto$2.toJSON = toISOString$1;
    proto$2.locale = locale;
    proto$2.localeData = localeData;
    proto$2.toIsoString = deprecate('toIsoString() is deprecated. Please use toISOString() instead (notice the capitals)', toISOString$1);
    proto$2.lang = lang; // Side effect imports
    // FORMATTING

    addFormatToken('X', 0, 0, 'unix');
    addFormatToken('x', 0, 0, 'valueOf'); // PARSING

    addRegexToken('x', matchSigned);
    addRegexToken('X', matchTimestamp);
    addParseToken('X', function (input, array, config) {
      config._d = new Date(parseFloat(input, 10) * 1000);
    });
    addParseToken('x', function (input, array, config) {
      config._d = new Date(toInt(input));
    }); // Side effect imports

    hooks.version = '2.24.0';
    setHookCallback(createLocal);
    hooks.fn = proto;
    hooks.min = min;
    hooks.max = max;
    hooks.now = now;
    hooks.utc = createUTC;
    hooks.unix = createUnix;
    hooks.months = listMonths;
    hooks.isDate = isDate;
    hooks.locale = getSetGlobalLocale;
    hooks.invalid = createInvalid;
    hooks.duration = createDuration;
    hooks.isMoment = isMoment;
    hooks.weekdays = listWeekdays;
    hooks.parseZone = createInZone;
    hooks.localeData = getLocale;
    hooks.isDuration = isDuration;
    hooks.monthsShort = listMonthsShort;
    hooks.weekdaysMin = listWeekdaysMin;
    hooks.defineLocale = defineLocale;
    hooks.updateLocale = updateLocale;
    hooks.locales = listLocales;
    hooks.weekdaysShort = listWeekdaysShort;
    hooks.normalizeUnits = normalizeUnits;
    hooks.relativeTimeRounding = getSetRelativeTimeRounding;
    hooks.relativeTimeThreshold = getSetRelativeTimeThreshold;
    hooks.calendarFormat = getCalendarFormat;
    hooks.prototype = proto; // currently HTML5 input type only supports 24-hour formats

    hooks.HTML5_FMT = {
      DATETIME_LOCAL: 'YYYY-MM-DDTHH:mm',
      // <input type="datetime-local" />
      DATETIME_LOCAL_SECONDS: 'YYYY-MM-DDTHH:mm:ss',
      // <input type="datetime-local" step="1" />
      DATETIME_LOCAL_MS: 'YYYY-MM-DDTHH:mm:ss.SSS',
      // <input type="datetime-local" step="0.001" />
      DATE: 'YYYY-MM-DD',
      // <input type="date" />
      TIME: 'HH:mm',
      // <input type="time" />
      TIME_SECONDS: 'HH:mm:ss',
      // <input type="time" step="1" />
      TIME_MS: 'HH:mm:ss.SSS',
      // <input type="time" step="0.001" />
      WEEK: 'GGGG-[W]WW',
      // <input type="week" />
      MONTH: 'YYYY-MM' // <input type="month" />

    };
    return hooks;
  });
}); // Maps for number <-> hex string conversion

var byteToHex = [];

for (var i = 0; i < 256; i++) {
  byteToHex[i] = (i + 0x100).toString(16).substr(1);
}
/**
 * Represent binary UUID into it's string representation.
 *
 * @param buf - Buffer containing UUID bytes.
 * @param offset - Offset from the start of the buffer where the UUID is saved (not needed if the buffer starts with the UUID).
 *
 * @returns String representation of the UUID.
 */


function stringifyUUID(buf, offset) {
  var i = offset || 0;
  var bth = byteToHex;
  return bth[buf[i++]] + bth[buf[i++]] + bth[buf[i++]] + bth[buf[i++]] + '-' + bth[buf[i++]] + bth[buf[i++]] + '-' + bth[buf[i++]] + bth[buf[i++]] + '-' + bth[buf[i++]] + bth[buf[i++]] + '-' + bth[buf[i++]] + bth[buf[i++]] + bth[buf[i++]] + bth[buf[i++]] + bth[buf[i++]] + bth[buf[i++]];
}
/**
 * Generate 16 random bytes to be used as a base for UUID.
 *
 * @ignore
 */


var random = function () {
  if (typeof crypto !== 'undefined' && crypto.getRandomValues) {
    // WHATWG crypto-based RNG - http://wiki.whatwg.org/wiki/Crypto
    // Moderately fast, high quality
    var _rnds8 = new Uint8Array(16);

    return function whatwgRNG() {
      crypto.getRandomValues(_rnds8);
      return _rnds8;
    };
  } // Math.random()-based (RNG)
  //
  // If all else fails, use Math.random().
  // It's fast, but is of unspecified quality.


  var _rnds = new Array(16);

  return function () {
    for (var i = 0, r; i < 16; i++) {
      if ((i & 0x03) === 0) {
        r = Math.random() * 0x100000000;
      }

      _rnds[i] = r >>> ((i & 0x03) << 3) & 0xff;
    }

    return _rnds;
  }; //     uuid.js
  //
  //     Copyright (c) 2010-2012 Robert Kieffer
  //     MIT License - http://opensource.org/licenses/mit-license.php
  // Unique ID creation requires a high quality random # generator.  We feature
  // detect to determine the best RNG source, normalizing to a function that
  // returns 128-bits of randomness, since that's what's usually required
  // return require('./rng');
}();

var byteToHex$1 = [];

for (var i$1 = 0; i$1 < 256; i$1++) {
  byteToHex$1[i$1] = (i$1 + 0x100).toString(16).substr(1);
} // **`v1()` - Generate time-based UUID**
//
// Inspired by https://github.com/LiosK/UUID.js
// and http://docs.python.org/library/uuid.html
// random #'s we need to init node and clockseq


var seedBytes = random(); // Per 4.5, create and 48-bit node id, (47 random bits + multicast bit = 1)

var defaultNodeId = [seedBytes[0] | 0x01, seedBytes[1], seedBytes[2], seedBytes[3], seedBytes[4], seedBytes[5]]; // Per 4.2.2, randomize (14 bit) clockseq

var defaultClockseq = (seedBytes[6] << 8 | seedBytes[7]) & 0x3fff; // Previous uuid creation time

/**
 * UUIDv4 options.
 */

/**
 * Generate UUIDv4
 *
 * @param options - Options to be used instead of default generated values.
 * String 'binary' is a shorthand for uuid4({}, new Array(16)).
 * @param buf - If present the buffer will be filled with the generated UUID.
 * @param offset - Offset of the UUID from the start of the buffer.
 *
 * @returns UUIDv4
 */

function uuid4() {
  var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
  var buf = arguments.length > 1 ? arguments[1] : undefined;
  var offset = arguments.length > 2 ? arguments[2] : undefined; // Deprecated - 'format' argument, as supported in v1.2

  var i = buf && offset || 0;

  if (typeof options === 'string') {
    buf = options === 'binary' ? new Array(16) : undefined;
    options = {};
  }

  var rnds = options.random || (options.rng || random)(); // Per 4.4, set bits for version and `clock_seq_hi_and_reserved`

  rnds[6] = rnds[6] & 0x0f | 0x40;
  rnds[8] = rnds[8] & 0x3f | 0x80; // Copy bytes to buffer, if provided

  if (buf) {
    for (var ii = 0; ii < 16; ii++) {
      buf[i + ii] = rnds[ii];
    }
  }

  return buf || stringifyUUID(rnds);
} // Rollup will complain about mixing default and named exports in UMD build,


function ownKeys(object, enumerableOnly) {
  var keys = Object.keys(object);

  if (Object.getOwnPropertySymbols) {
    keys.push.apply(keys, Object.getOwnPropertySymbols(object));
  }

  if (enumerableOnly) keys = keys.filter(function (sym) {
    return Object.getOwnPropertyDescriptor(object, sym).enumerable;
  });
  return keys;
}

function _objectSpread(target) {
  for (var i = 1; i < arguments.length; i++) {
    var source = arguments[i] != null ? arguments[i] : {};

    if (i % 2) {
      ownKeys(source, true).forEach(function (key) {
        defineProperty(target, key, source[key]);
      });
    } else if (Object.getOwnPropertyDescriptors) {
      Object.defineProperties(target, Object.getOwnPropertyDescriptors(source));
    } else {
      ownKeys(source).forEach(function (key) {
        Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
      });
    }
  }

  return target;
} // for example '/Date(1198908717056)/' or '/Date(1198908717056-0700)/'
// code from http://momentjs.com/


var ASPDateRegex = /^\/?Date\((-?\d+)/i; // Hex color

var fullHexRE = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i;
var shortHexRE = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
/**
 * Hue, Saturation, Value.
 */

/**
 * Test whether given object is a number
 *
 * @param value - Input value of unknown type.
 *
 * @returns True if number, false otherwise.
 */

function isNumber(value) {
  return value instanceof Number || typeof value === 'number';
}
/**
 * Remove everything in the DOM object
 *
 * @param DOMobject - Node whose child nodes will be recursively deleted.
 */


function recursiveDOMDelete(DOMobject) {
  if (DOMobject) {
    while (DOMobject.hasChildNodes() === true) {
      var child = DOMobject.firstChild;

      if (child) {
        recursiveDOMDelete(child);
        DOMobject.removeChild(child);
      }
    }
  }
}
/**
 * Test whether given object is a string
 *
 * @param value - Input value of unknown type.
 *
 * @returns True if string, false otherwise.
 */


function isString(value) {
  return value instanceof String || typeof value === 'string';
}
/**
 * Test whether given object is a object (not primitive or null).
 *
 * @param value - Input value of unknown type.
 *
 * @returns True if not null object, false otherwise.
 */


function isObject(value) {
  return _typeof_1(value) === 'object' && value !== null;
}
/**
 * Test whether given object is a Date, or a String containing a Date
 *
 * @param value - Input value of unknown type.
 *
 * @returns True if Date instance or string date representation, false otherwise.
 */


function isDate(value) {
  if (value instanceof Date) {
    return true;
  } else if (isString(value)) {
    // test whether this string contains a date
    var match = ASPDateRegex.exec(value);

    if (match) {
      return true;
    } else if (!isNaN(Date.parse(value))) {
      return true;
    }
  }

  return false;
}
/**
 * Test whether given object is a Moment date.
 * @TODO: This is basically a workaround, if Moment was imported property it wouldn't necessary as moment.isMoment is a TS type guard.
 *
 * @param value - Input value of unknown type.
 *
 * @returns True if Moment instance, false otherwise.
 */


function isMoment(value) {
  return moment.isMoment(value);
}
/**
 * Copy property from b to a if property present in a.
 * If property in b explicitly set to null, delete it if `allowDeletion` set.
 *
 * Internal helper routine, should not be exported. Not added to `exports` for that reason.
 *
 * @param a - Target object.
 * @param b - Source object.
 * @param prop - Name of property to copy from b to a.
 * @param allowDeletion  if true, delete property in a if explicitly set to null in b
 */


function copyOrDelete(a, b, prop, allowDeletion) {
  var doDeletion = false;

  if (allowDeletion === true) {
    doDeletion = b[prop] === null && a[prop] !== undefined;
  }

  if (doDeletion) {
    delete a[prop];
  } else {
    a[prop] = b[prop]; // Remember, this is a reference copy!
  }
}
/**
 * Fill an object with a possibly partially defined other object.
 *
 * Only copies values for the properties already present in a.
 * That means an object is not created on a property if only the b object has it.
 *
 * @param a - The object that will have it's properties updated.
 * @param b - The object with property updates.
 * @param allowDeletion - if true, delete properties in a that are explicitly set to null in b
 */


function fillIfDefined(a, b) {
  var allowDeletion = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false; // NOTE: iteration of properties of a
  // NOTE: prototype properties iterated over as well

  for (var prop in a) {
    if (b[prop] !== undefined) {
      if (b[prop] === null || _typeof_1(b[prop]) !== 'object') {
        // Note: typeof null === 'object'
        copyOrDelete(a, b, prop, allowDeletion);
      } else {
        var aProp = a[prop];
        var bProp = b[prop];

        if (isObject(aProp) && isObject(bProp)) {
          fillIfDefined(aProp, bProp, allowDeletion);
        }
      }
    }
  }
}
/**
 * Copy the values of all of the enumerable own properties from one or more source objects to a
 * target object. Returns the target object.
 *
 * @param target - The target object to copy to.
 * @param source - The source object from which to copy properties.
 *
 * @return The target object.
 */


var extend = Object.assign;
/**
 * Extend object a with selected properties of object b or a series of objects
 * Only properties with defined values are copied
 *
 * @param props - Properties to be copied to a.
 * @param a - The target.
 * @param others - The sources.
 *
 * @returns Argument a.
 */

function selectiveExtend(props, a) {
  if (!Array.isArray(props)) {
    throw new Error('Array with property names expected as first argument');
  }

  for (var _len = arguments.length, others = new Array(_len > 2 ? _len - 2 : 0), _key = 2; _key < _len; _key++) {
    others[_key - 2] = arguments[_key];
  }

  for (var _i = 0, _others = others; _i < _others.length; _i++) {
    var other = _others[_i];

    for (var p = 0; p < props.length; p++) {
      var prop = props[p];

      if (other && Object.prototype.hasOwnProperty.call(other, prop)) {
        a[prop] = other[prop];
      }
    }
  }

  return a;
}
/**
 * Extend object a with selected properties of object b.
 * Only properties with defined values are copied.
 *
 * **Note:** Previous version of this routine implied that multiple source objects
 *           could be used; however, the implementation was **wrong**.
 *           Since multiple (>1) sources weren't used anywhere in the `vis.js` code,
 *           this has been removed
 *
 * @param props - Names of first-level properties to copy over.
 * @param a - Target object.
 * @param b - Source object.
 * @param allowDeletion - If true, delete property in a if explicitly set to null in b.
 *
 * @returns Argument a.
 */


function selectiveDeepExtend(props, a, b) {
  var allowDeletion = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false; // TODO: add support for Arrays to deepExtend

  if (Array.isArray(b)) {
    throw new TypeError('Arrays are not supported by deepExtend');
  }

  for (var p = 0; p < props.length; p++) {
    var prop = props[p];

    if (Object.prototype.hasOwnProperty.call(b, prop)) {
      if (b[prop] && b[prop].constructor === Object) {
        if (a[prop] === undefined) {
          a[prop] = {};
        }

        if (a[prop].constructor === Object) {
          deepExtend(a[prop], b[prop], false, allowDeletion);
        } else {
          copyOrDelete(a, b, prop, allowDeletion);
        }
      } else if (Array.isArray(b[prop])) {
        throw new TypeError('Arrays are not supported by deepExtend');
      } else {
        copyOrDelete(a, b, prop, allowDeletion);
      }
    }
  }

  return a;
}
/**
 * Extend object `a` with properties of object `b`, ignoring properties which are explicitly
 * specified to be excluded.
 *
 * The properties of `b` are considered for copying.
 * Properties which are themselves objects are are also extended.
 * Only properties with defined values are copied
 *
 * @param propsToExclude - Names of properties which should *not* be copied.
 * @param a - Object to extend.
 * @param b - Object to take properties from for extension.
 * @param allowDeletion - If true, delete properties in a that are explicitly set to null in b.
 *
 * @returns Argument a.
 */


function selectiveNotDeepExtend(propsToExclude, a, b) {
  var allowDeletion = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false; // TODO: add support for Arrays to deepExtend
  // NOTE: array properties have an else-below; apparently, there is a problem here.

  if (Array.isArray(b)) {
    throw new TypeError('Arrays are not supported by deepExtend');
  }

  for (var prop in b) {
    if (!Object.prototype.hasOwnProperty.call(b, prop)) {
      continue;
    } // Handle local properties only


    if (propsToExclude.indexOf(prop) !== -1) {
      continue;
    } // In exclusion list, skip


    if (b[prop] && b[prop].constructor === Object) {
      if (a[prop] === undefined) {
        a[prop] = {};
      }

      if (a[prop].constructor === Object) {
        deepExtend(a[prop], b[prop]); // NOTE: allowDeletion not propagated!
      } else {
        copyOrDelete(a, b, prop, allowDeletion);
      }
    } else if (Array.isArray(b[prop])) {
      a[prop] = [];

      for (var i = 0; i < b[prop].length; i++) {
        a[prop].push(b[prop][i]);
      }
    } else {
      copyOrDelete(a, b, prop, allowDeletion);
    }
  }

  return a;
}
/**
 * Deep extend an object a with the properties of object b
 *
 * @param a - Target object.
 * @param b - Source object.
 * @param protoExtend - If true, the prototype values will also be extended
 * (ie. the options objects that inherit from others will also get the inherited options).
 * @param allowDeletion - If true, the values of fields that are null will be deleted.
 *
 * @returns Argument a.
 */


function deepExtend(a, b) {
  var protoExtend = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
  var allowDeletion = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;

  for (var prop in b) {
    if (Object.prototype.hasOwnProperty.call(b, prop) || protoExtend === true) {
      if (b[prop] && b[prop].constructor === Object) {
        if (a[prop] === undefined) {
          a[prop] = {};
        }

        if (a[prop].constructor === Object) {
          deepExtend(a[prop], b[prop], protoExtend); // NOTE: allowDeletion not propagated!
        } else {
          copyOrDelete(a, b, prop, allowDeletion);
        }
      } else if (Array.isArray(b[prop])) {
        a[prop] = [];

        for (var i = 0; i < b[prop].length; i++) {
          a[prop].push(b[prop][i]);
        }
      } else {
        copyOrDelete(a, b, prop, allowDeletion);
      }
    }
  }

  return a;
}
/**
 * Test whether all elements in two arrays are equal.
 *
 * @param a - First array.
 * @param b - Second array.
 *
 * @returns True if both arrays have the same length and same elements (1 = '1').
 */


function equalArray(a, b) {
  if (a.length !== b.length) {
    return false;
  }

  for (var i = 0, len = a.length; i < len; i++) {
    if (a[i] != b[i]) {
      return false;
    }
  }

  return true;
}
/**
 * Convert an object into another type
 *
 * @param object - Value of unknown type.
 * @param type - Name of the desired type.
 *
 * @returns Object in the desired type.
 * @throws Error
 */


function convert(object, type) {
  var match;

  if (object === undefined) {
    return undefined;
  }

  if (object === null) {
    return null;
  }

  if (!type) {
    return object;
  }

  if (!(typeof type === 'string') && !(type instanceof String)) {
    throw new Error('Type must be a string');
  } //noinspection FallthroughInSwitchStatementJS


  switch (type) {
    case 'boolean':
    case 'Boolean':
      return Boolean(object);

    case 'number':
    case 'Number':
      if (isString(object) && !isNaN(Date.parse(object))) {
        return moment(object).valueOf();
      } else {
        // @TODO: I don't think that Number and String constructors are a good idea.
        // This could also fail if the object doesn't have valueOf method or if it's redefined.
        // For example: Object.create(null) or { valueOf: 7 }.
        return Number(object.valueOf());
      }

    case 'string':
    case 'String':
      return String(object);

    case 'Date':
      if (isNumber(object)) {
        return new Date(object);
      }

      if (object instanceof Date) {
        return new Date(object.valueOf());
      } else if (isMoment(object)) {
        return new Date(object.valueOf());
      }

      if (isString(object)) {
        match = ASPDateRegex.exec(object);

        if (match) {
          // object is an ASP date
          return new Date(Number(match[1])); // parse number
        } else {
          return moment(new Date(object)).toDate(); // parse string
        }
      } else {
        throw new Error('Cannot convert object of type ' + getType(object) + ' to type Date');
      }

    case 'Moment':
      if (isNumber(object)) {
        return moment(object);
      }

      if (object instanceof Date) {
        return moment(object.valueOf());
      } else if (isMoment(object)) {
        return moment(object);
      }

      if (isString(object)) {
        match = ASPDateRegex.exec(object);

        if (match) {
          // object is an ASP date
          return moment(Number(match[1])); // parse number
        } else {
          return moment(object); // parse string
        }
      } else {
        throw new Error('Cannot convert object of type ' + getType(object) + ' to type Date');
      }

    case 'ISODate':
      if (isNumber(object)) {
        return new Date(object);
      } else if (object instanceof Date) {
        return object.toISOString();
      } else if (isMoment(object)) {
        return object.toDate().toISOString();
      } else if (isString(object)) {
        match = ASPDateRegex.exec(object);

        if (match) {
          // object is an ASP date
          return new Date(Number(match[1])).toISOString(); // parse number
        } else {
          return moment(object).format(); // ISO 8601
        }
      } else {
        throw new Error('Cannot convert object of type ' + getType(object) + ' to type ISODate');
      }

    case 'ASPDate':
      if (isNumber(object)) {
        return '/Date(' + object + ')/';
      } else if (object instanceof Date || isMoment(object)) {
        return '/Date(' + object.valueOf() + ')/';
      } else if (isString(object)) {
        match = ASPDateRegex.exec(object);

        var _value;

        if (match) {
          // object is an ASP date
          _value = new Date(Number(match[1])).valueOf(); // parse number
        } else {
          _value = new Date(object).valueOf(); // parse string
        }

        return '/Date(' + _value + ')/';
      } else {
        throw new Error('Cannot convert object of type ' + getType(object) + ' to type ASPDate');
      }

    default:
      var never = type;
      throw new Error("Unknown type ".concat(never));
  }
}
/**
 * Get the type of an object, for example exports.getType([]) returns 'Array'
 *
 * @param object - Input value of unknown type.
 *
 * @returns Detected type.
 */


function getType(object) {
  var type = _typeof_1(object);

  if (type === 'object') {
    if (object === null) {
      return 'null';
    }

    if (object instanceof Boolean) {
      return 'Boolean';
    }

    if (object instanceof Number) {
      return 'Number';
    }

    if (object instanceof String) {
      return 'String';
    }

    if (Array.isArray(object)) {
      return 'Array';
    }

    if (object instanceof Date) {
      return 'Date';
    }

    return 'Object';
  }

  if (type === 'number') {
    return 'Number';
  }

  if (type === 'boolean') {
    return 'Boolean';
  }

  if (type === 'string') {
    return 'String';
  }

  if (type === undefined) {
    return 'undefined';
  }

  return type;
}
/**
 * Used to extend an array and copy it. This is used to propagate paths recursively.
 *
 * @param arr - First part.
 * @param newValue - The value to be aadded into the array.
 *
 * @returns A new array with all items from arr and newValue (which is last).
 */


function copyAndExtendArray(arr, newValue) {
  return [].concat(toConsumableArray(arr), [newValue]);
}
/**
 * Used to extend an array and copy it. This is used to propagate paths recursively.
 *
 * @param arr - The array to be copied.
 *
 * @returns Shallow copy of arr.
 */


function copyArray(arr) {
  return arr.slice();
}
/**
 * Retrieve the absolute left value of a DOM element
 *
 * @param elem - A dom element, for example a div.
 *
 * @returns The absolute left position of this element in the browser page.
 */


function getAbsoluteLeft(elem) {
  return elem.getBoundingClientRect().left;
}
/**
 * Retrieve the absolute right value of a DOM element
 *
 * @param elem - A dom element, for example a div.
 *
 * @returns The absolute right position of this element in the browser page.
 */


function getAbsoluteRight(elem) {
  return elem.getBoundingClientRect().right;
}
/**
 * Retrieve the absolute top value of a DOM element
 *
 * @param elem - A dom element, for example a div.
 *
 * @returns The absolute top position of this element in the browser page.
 */


function getAbsoluteTop(elem) {
  return elem.getBoundingClientRect().top;
}
/**
 * Add a className to the given elements style.
 *
 * @param elem - The element to which the classes will be added.
 * @param classNames - Space separated list of classes.
 */


function addClassName(elem, classNames) {
  var classes = elem.className.split(' ');
  var newClasses = classNames.split(' ');
  classes = classes.concat(newClasses.filter(function (className) {
    return classes.indexOf(className) < 0;
  }));
  elem.className = classes.join(' ');
}
/**
 * Remove a className from the given elements style.
 *
 * @param elem - The element from which the classes will be removed.
 * @param classNames - Space separated list of classes.
 */


function removeClassName(elem, classNames) {
  var classes = elem.className.split(' ');
  var oldClasses = classNames.split(' ');
  classes = classes.filter(function (className) {
    return oldClasses.indexOf(className) < 0;
  });
  elem.className = classes.join(' ');
}
/**
 * For each method for both arrays and objects.
 * In case of an array, the built-in Array.forEach() is applied (**No, it's not!**).
 * In case of an Object, the method loops over all properties of the object.
 *
 * @param object - An Object or Array to be iterated over.
 * @param callback - Array.forEach-like callback.
 */


function forEach(object, callback) {
  if (Array.isArray(object)) {
    // array
    var len = object.length;

    for (var i = 0; i < len; i++) {
      callback(object[i], i, object);
    }
  } else {
    // object
    for (var _key2 in object) {
      if (Object.prototype.hasOwnProperty.call(object, _key2)) {
        callback(object[_key2], _key2, object);
      }
    }
  }
}
/**
 * Convert an object into an array: all objects properties are put into the array. The resulting array is unordered.
 *
 * @param o - Object that contains the properties and methods.
 *
 * @returns An array of unordered values.
 */


var toArray = Object.values;
/**
 * Update a property in an object
 *
 * @param object - The object whose property will be updated.
 * @param key - Name of the property to be updated.
 * @param value - The new value to be assigned.
 *
 * @returns Whether the value was updated (true) or already strictly the same in the original object (false).
 */

function updateProperty(object, key, value) {
  if (object[key] !== value) {
    object[key] = value;
    return true;
  } else {
    return false;
  }
}
/**
 * Throttle the given function to be only executed once per animation frame.
 *
 * @param fn - The original function.
 *
 * @returns The throttled function.
 */


function throttle(fn) {
  var scheduled = false;
  return function () {
    if (!scheduled) {
      scheduled = true;
      requestAnimationFrame(function () {
        scheduled = false;
        fn();
      });
    }
  };
}
/**
 * Add and event listener. Works for all browsers.
 *
 * @param element - The element to bind the event listener to.
 * @param action - Same as Element.addEventListener(action, —, —).
 * @param listener - Same as Element.addEventListener(—, listener, —).
 * @param useCapture - Same as Element.addEventListener(—, —, useCapture).
 */


function addEventListener(element, action, listener, useCapture) {
  if (element.addEventListener) {
    if (useCapture === undefined) {
      useCapture = false;
    }

    if (action === 'mousewheel' && navigator.userAgent.indexOf('Firefox') >= 0) {
      action = 'DOMMouseScroll'; // For Firefox
    }

    element.addEventListener(action, listener, useCapture);
  } else {
    element.attachEvent('on' + action, listener); // IE browsers
  }
}
/**
 * Remove an event listener from an element
 *
 * @param element - The element to bind the event listener to.
 * @param action - Same as Element.removeEventListener(action, —, —).
 * @param listener - Same as Element.removeEventListener(—, listener, —).
 * @param useCapture - Same as Element.removeEventListener(—, —, useCapture).
 */


function removeEventListener(element, action, listener, useCapture) {
  if (element.removeEventListener) {
    // non-IE browsers
    if (useCapture === undefined) {
      useCapture = false;
    }

    if (action === 'mousewheel' && navigator.userAgent.indexOf('Firefox') >= 0) {
      action = 'DOMMouseScroll'; // For Firefox
    }

    element.removeEventListener(action, listener, useCapture);
  } else {
    element.detachEvent('on' + action, listener); // IE browsers
  }
}
/**
 * Cancels the event's default action if it is cancelable, without stopping further propagation of the event.
 *
 * @param event - The event whose default action should be prevented.
 */


function preventDefault(event) {
  if (!event) {
    event = window.event;
  }

  if (!event) ;else if (event.preventDefault) {
    event.preventDefault(); // non-IE browsers
  } else {
    event.returnValue = false; // IE browsers
  }
}
/**
 * Get HTML element which is the target of the event.
 *
 * @param event - The event.
 *
 * @returns The element or null if not obtainable.
 */


function getTarget() {
  var event = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : window.event; // code from http://www.quirksmode.org/js/events_properties.html
  // @TODO: EventTarget can be almost anything, is it okay to return only Elements?

  var target = null;
  if (!event) ;else if (event.target) {
    target = event.target;
  } else if (event.srcElement) {
    target = event.srcElement;
  }

  if (!(target instanceof Element)) {
    return null;
  }

  if (target.nodeType != null && target.nodeType == 3) {
    // defeat Safari bug
    target = target.parentNode;

    if (!(target instanceof Element)) {
      return null;
    }
  }

  return target;
}
/**
 * Check if given element contains given parent somewhere in the DOM tree
 *
 * @param element - The element to be tested.
 * @param parent - The ancestor (not necessarily parent) of the element.
 *
 * @returns True if parent is an ancestor of the element, false otherwise.
 */


function hasParent(element, parent) {
  var elem = element;

  while (elem) {
    if (elem === parent) {
      return true;
    } else if (elem.parentNode) {
      elem = elem.parentNode;
    } else {
      return false;
    }
  }

  return false;
}

var option = {
  /**
   * Convert a value into a boolean.
   *
   * @param value - Value to be converted intoboolean, a function will be executed as (() => unknown).
   * @param defaultValue - If the value or the return value of the function == null then this will be returned.
   *
   * @returns Corresponding boolean value, if none then the default value, if none then null.
   */
  asBoolean: function asBoolean(value, defaultValue) {
    if (typeof value == 'function') {
      value = value();
    }

    if (value != null) {
      return value != false;
    }

    return defaultValue || null;
  },

  /**
   * Convert a value into a number.
   *
   * @param value - Value to be converted intonumber, a function will be executed as (() => unknown).
   * @param defaultValue - If the value or the return value of the function == null then this will be returned.
   *
   * @returns Corresponding **boxed** number value, if none then the default value, if none then null.
   */
  asNumber: function asNumber(value, defaultValue) {
    if (typeof value == 'function') {
      value = value();
    }

    if (value != null) {
      return Number(value) || defaultValue || null;
    }

    return defaultValue || null;
  },

  /**
   * Convert a value into a string.
   *
   * @param value - Value to be converted intostring, a function will be executed as (() => unknown).
   * @param defaultValue - If the value or the return value of the function == null then this will be returned.
   *
   * @returns Corresponding **boxed** string value, if none then the default value, if none then null.
   */
  asString: function asString(value, defaultValue) {
    if (typeof value == 'function') {
      value = value();
    }

    if (value != null) {
      return String(value);
    }

    return defaultValue || null;
  },

  /**
   * Convert a value into a size.
   *
   * @param value - Value to be converted intosize, a function will be executed as (() => unknown).
   * @param defaultValue - If the value or the return value of the function == null then this will be returned.
   *
   * @returns Corresponding string value (number + 'px'), if none then the default value, if none then null.
   */
  asSize: function asSize(value, defaultValue) {
    if (typeof value == 'function') {
      value = value();
    }

    if (isString(value)) {
      return value;
    } else if (isNumber(value)) {
      return value + 'px';
    } else {
      return defaultValue || null;
    }
  },

  /**
   * Convert a value into a DOM Element.
   *
   * @param value - Value to be converted into DOM Element, a function will be executed as (() => unknown).
   * @param defaultValue - If the value or the return value of the function == null then this will be returned.
   *
   * @returns The DOM Element, if none then the default value, if none then null.
   */
  asElement: function asElement(value, defaultValue) {
    if (typeof value == 'function') {
      value = value();
    }

    return value || defaultValue || null;
  }
};
/**
 * Convert hex color string into RGB color object.
 * http://stackoverflow.com/questions/5623838/rgb-to-hex-and-hex-to-rgb
 *
 * @param hex - Hex color string (3 or 6 digits, with or without #).
 *
 * @returns RGB color object.
 */

function hexToRGB(hex) {
  var result;

  switch (hex.length) {
    case 3:
    case 4:
      result = shortHexRE.exec(hex);
      return result ? {
        r: parseInt(result[1] + result[1], 16),
        g: parseInt(result[2] + result[2], 16),
        b: parseInt(result[3] + result[3], 16)
      } : null;

    case 6:
    case 7:
      result = fullHexRE.exec(hex);
      return result ? {
        r: parseInt(result[1], 16),
        g: parseInt(result[2], 16),
        b: parseInt(result[3], 16)
      } : null;

    default:
      return null;
  }
}
/**
 * This function takes string color in hex or RGB format and adds the opacity, RGBA is passed through unchanged.
 *
 * @param color - The color string (hex, RGB, RGBA).
 * @param opacity - The new opacity.
 *
 * @returns RGBA string, for example 'rgba(255, 0, 127, 0.3)'.
 */


function overrideOpacity(color, opacity) {
  if (color.indexOf('rgba') !== -1) {
    return color;
  } else if (color.indexOf('rgb') !== -1) {
    var rgb = color.substr(color.indexOf('(') + 1).replace(')', '').split(',');
    return 'rgba(' + rgb[0] + ',' + rgb[1] + ',' + rgb[2] + ',' + opacity + ')';
  } else {
    var _rgb = hexToRGB(color);

    if (_rgb == null) {
      return color;
    } else {
      return 'rgba(' + _rgb.r + ',' + _rgb.g + ',' + _rgb.b + ',' + opacity + ')';
    }
  }
}
/**
 * Convert RGB <0, 255> into hex color string.
 *
 * @param red - Red channel.
 * @param green - Green channel.
 * @param blue - Blue channel.
 *
 * @returns Hex color string (for example: '#0acdc0').
 */


function RGBToHex(red, green, blue) {
  return '#' + ((1 << 24) + (red << 16) + (green << 8) + blue).toString(16).slice(1);
}
/**
 * Parse a color property into an object with border, background, and highlight colors
 *
 * @param inputColor - Shorthand color string or input color object.
 * @param defaultColor - Full color object to fill in missing values in inputColor.
 *
 * @returns Color object.
 */


function parseColor(inputColor, defaultColor) {
  if (isString(inputColor)) {
    var colorStr = inputColor;

    if (isValidRGB(colorStr)) {
      var rgb = colorStr.substr(4).substr(0, colorStr.length - 5).split(',').map(function (value) {
        return parseInt(value);
      });
      colorStr = RGBToHex(rgb[0], rgb[1], rgb[2]);
    }

    if (isValidHex(colorStr) === true) {
      var hsv = hexToHSV(colorStr);
      var lighterColorHSV = {
        h: hsv.h,
        s: hsv.s * 0.8,
        v: Math.min(1, hsv.v * 1.02)
      };
      var darkerColorHSV = {
        h: hsv.h,
        s: Math.min(1, hsv.s * 1.25),
        v: hsv.v * 0.8
      };
      var darkerColorHex = HSVToHex(darkerColorHSV.h, darkerColorHSV.s, darkerColorHSV.v);
      var lighterColorHex = HSVToHex(lighterColorHSV.h, lighterColorHSV.s, lighterColorHSV.v);
      return {
        background: colorStr,
        border: darkerColorHex,
        highlight: {
          background: lighterColorHex,
          border: darkerColorHex
        },
        hover: {
          background: lighterColorHex,
          border: darkerColorHex
        }
      };
    } else {
      return {
        background: colorStr,
        border: colorStr,
        highlight: {
          background: colorStr,
          border: colorStr
        },
        hover: {
          background: colorStr,
          border: colorStr
        }
      };
    }
  } else {
    if (defaultColor) {
      var color = {
        background: inputColor.background || defaultColor.background,
        border: inputColor.border || defaultColor.border,
        highlight: isString(inputColor.highlight) ? {
          border: inputColor.highlight,
          background: inputColor.highlight
        } : {
          background: inputColor.highlight && inputColor.highlight.background || defaultColor.highlight.background,
          border: inputColor.highlight && inputColor.highlight.border || defaultColor.highlight.border
        },
        hover: isString(inputColor.hover) ? {
          border: inputColor.hover,
          background: inputColor.hover
        } : {
          border: inputColor.hover && inputColor.hover.border || defaultColor.hover.border,
          background: inputColor.hover && inputColor.hover.background || defaultColor.hover.background
        }
      };
      return color;
    } else {
      var _color = {
        background: inputColor.background || undefined,
        border: inputColor.border || undefined,
        highlight: isString(inputColor.highlight) ? {
          border: inputColor.highlight,
          background: inputColor.highlight
        } : {
          background: inputColor.highlight && inputColor.highlight.background || undefined,
          border: inputColor.highlight && inputColor.highlight.border || undefined
        },
        hover: isString(inputColor.hover) ? {
          border: inputColor.hover,
          background: inputColor.hover
        } : {
          border: inputColor.hover && inputColor.hover.border || undefined,
          background: inputColor.hover && inputColor.hover.background || undefined
        }
      };
      return _color;
    }
  }
}
/**
 * Convert RGB <0, 255> into HSV object.
 * http://www.javascripter.net/faq/rgb2hsv.htm
 *
 * @param red - Red channel.
 * @param green - Green channel.
 * @param blue - Blue channel.
 *
 * @returns HSV color object.
 */


function RGBToHSV(red, green, blue) {
  red = red / 255;
  green = green / 255;
  blue = blue / 255;
  var minRGB = Math.min(red, Math.min(green, blue));
  var maxRGB = Math.max(red, Math.max(green, blue)); // Black-gray-white

  if (minRGB === maxRGB) {
    return {
      h: 0,
      s: 0,
      v: minRGB
    };
  } // Colors other than black-gray-white:


  var d = red === minRGB ? green - blue : blue === minRGB ? red - green : blue - red;
  var h = red === minRGB ? 3 : blue === minRGB ? 1 : 5;
  var hue = 60 * (h - d / (maxRGB - minRGB)) / 360;
  var saturation = (maxRGB - minRGB) / maxRGB;
  var value = maxRGB;
  return {
    h: hue,
    s: saturation,
    v: value
  };
}

var cssUtil = {
  // split a string with css styles into an object with key/values
  split: function split(cssText) {
    var styles = {};
    cssText.split(';').forEach(function (style) {
      if (style.trim() != '') {
        var parts = style.split(':');

        var _key3 = parts[0].trim();

        var _value2 = parts[1].trim();

        styles[_key3] = _value2;
      }
    });
    return styles;
  },
  // build a css text string from an object with key/values
  join: function join(styles) {
    return Object.keys(styles).map(function (key) {
      return key + ': ' + styles[key];
    }).join('; ');
  }
};
/**
 * Append a string with css styles to an element
 *
 * @param element - The element that will receive new styles.
 * @param cssText - The styles to be appended.
 */

function addCssText(element, cssText) {
  var currentStyles = cssUtil.split(element.style.cssText);
  var newStyles = cssUtil.split(cssText);

  var styles = _objectSpread({}, currentStyles, {}, newStyles);

  element.style.cssText = cssUtil.join(styles);
}
/**
 * Remove a string with css styles from an element
 *
 * @param element - The element from which styles should be removed.
 * @param cssText - The styles to be removed.
 */


function removeCssText(element, cssText) {
  var styles = cssUtil.split(element.style.cssText);
  var removeStyles = cssUtil.split(cssText);

  for (var _key4 in removeStyles) {
    if (Object.prototype.hasOwnProperty.call(removeStyles, _key4)) {
      delete styles[_key4];
    }
  }

  element.style.cssText = cssUtil.join(styles);
}
/**
 * Convert HSV <0, 1> into RGB color object.
 * https://gist.github.com/mjijackson/5311256
 *
 * @param h - Hue
 * @param s - Saturation
 * @param v - Value
 *
 * @returns RGB color object.
 */


function HSVToRGB(h, s, v) {
  var r;
  var g;
  var b;
  var i = Math.floor(h * 6);
  var f = h * 6 - i;
  var p = v * (1 - s);
  var q = v * (1 - f * s);
  var t = v * (1 - (1 - f) * s);

  switch (i % 6) {
    case 0:
      r = v, g = t, b = p;
      break;

    case 1:
      r = q, g = v, b = p;
      break;

    case 2:
      r = p, g = v, b = t;
      break;

    case 3:
      r = p, g = q, b = v;
      break;

    case 4:
      r = t, g = p, b = v;
      break;

    case 5:
      r = v, g = p, b = q;
      break;
  }

  return {
    r: Math.floor(r * 255),
    g: Math.floor(g * 255),
    b: Math.floor(b * 255)
  };
}
/**
 * Convert HSV <0, 1> into hex color string.
 *
 * @param h - Hue
 * @param s - Saturation
 * @param v - Value
 *
 * @returns Hex color string.
 */


function HSVToHex(h, s, v) {
  var rgb = HSVToRGB(h, s, v);
  return RGBToHex(rgb.r, rgb.g, rgb.b);
}
/**
 * Convert hex color string into HSV <0, 1>.
 *
 * @param hex - Hex color string.
 *
 * @returns HSV color object.
 */


function hexToHSV(hex) {
  var rgb = hexToRGB(hex);

  if (!rgb) {
    throw new TypeError("'".concat(hex, "' is not a valid color."));
  }

  return RGBToHSV(rgb.r, rgb.g, rgb.b);
}
/**
 * Validate hex color string.
 *
 * @param hex - Unknown string that may contain a color.
 *
 * @returns True if the string is valid, false otherwise.
 */


function isValidHex(hex) {
  var isOk = /(^#[0-9A-F]{6}$)|(^#[0-9A-F]{3}$)/i.test(hex);
  return isOk;
}
/**
 * Validate RGB color string.
 *
 * @param rgb - Unknown string that may contain a color.
 *
 * @returns True if the string is valid, false otherwise.
 */


function isValidRGB(rgb) {
  rgb = rgb.replace(' ', '');
  var isOk = /rgb\((\d{1,3}),(\d{1,3}),(\d{1,3})\)/i.test(rgb);
  return isOk;
}
/**
 * Validate RGBA color string.
 *
 * @param rgba - Unknown string that may contain a color.
 *
 * @returns True if the string is valid, false otherwise.
 */


function isValidRGBA(rgba) {
  rgba = rgba.replace(' ', '');
  var isOk = /rgba\((\d{1,3}),(\d{1,3}),(\d{1,3}),(0?.{1,3})\)/i.test(rgba);
  return isOk;
}
/**
 * This recursively redirects the prototype of JSON objects to the referenceObject.
 * This is used for default options.
 *
 * @param fields - Names of properties to be bridged.
 * @param referenceObject - The original object.
 *
 * @returns A new object inheriting from the referenceObject.
 */


function selectiveBridgeObject(fields, referenceObject) {
  if (referenceObject !== null && _typeof_1(referenceObject) === 'object') {
    // !!! typeof null === 'object'
    var objectTo = Object.create(referenceObject);

    for (var i = 0; i < fields.length; i++) {
      if (Object.prototype.hasOwnProperty.call(referenceObject, fields[i])) {
        if (_typeof_1(referenceObject[fields[i]]) == 'object') {
          objectTo[fields[i]] = bridgeObject(referenceObject[fields[i]]);
        }
      }
    }

    return objectTo;
  } else {
    return null;
  }
}
/**
 * This recursively redirects the prototype of JSON objects to the referenceObject.
 * This is used for default options.
 *
 * @param referenceObject - The original object.
 *
 * @returns The Element if the referenceObject is an Element, or a new object inheriting from the referenceObject.
 */


function bridgeObject(referenceObject) {
  if (referenceObject === null || _typeof_1(referenceObject) !== 'object') {
    return null;
  }

  if (referenceObject instanceof Element) {
    // Avoid bridging DOM objects
    return referenceObject;
  }

  var objectTo = Object.create(referenceObject);

  for (var i in referenceObject) {
    if (Object.prototype.hasOwnProperty.call(referenceObject, i)) {
      if (_typeof_1(referenceObject[i]) == 'object') {
        objectTo[i] = bridgeObject(referenceObject[i]);
      }
    }
  }

  return objectTo;
}
/**
 * This method provides a stable sort implementation, very fast for presorted data.
 *
 * @param a - The array to be sorted (in-place).
 * @param compare - An order comparator.
 *
 * @returns The argument a.
 */


function insertSort(a, compare) {
  for (var i = 0; i < a.length; i++) {
    var k = a[i];
    var j = void 0;

    for (j = i; j > 0 && compare(k, a[j - 1]) < 0; j--) {
      a[j] = a[j - 1];
    }

    a[j] = k;
  }

  return a;
}
/**
 * This is used to set the options of subobjects in the options object.
 *
 * A requirement of these subobjects is that they have an 'enabled' element
 * which is optional for the user but mandatory for the program.
 *
 * The added value here of the merge is that option 'enabled' is set as required.
 *
 * @param mergeTarget - Either this.options or the options used for the groups.
 * @param options - Options.
 * @param option - Option key in the options argument.
 * @param globalOptions - Global options, passed in to determine value of option 'enabled'.
 */


function mergeOptions(mergeTarget, options, option) {
  var globalOptions = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {}; // Local helpers

  var isPresent = function isPresent(obj) {
    return obj !== null && obj !== undefined;
  };

  var isObject = function isObject(obj) {
    return obj !== null && _typeof_1(obj) === 'object';
  }; // https://stackoverflow.com/a/34491287/1223531


  var isEmpty = function isEmpty(obj) {
    for (var x in obj) {
      if (Object.prototype.hasOwnProperty.call(obj, x)) {
        return false;
      }
    }

    return true;
  }; // Guards


  if (!isObject(mergeTarget)) {
    throw new Error('Parameter mergeTarget must be an object');
  }

  if (!isObject(options)) {
    throw new Error('Parameter options must be an object');
  }

  if (!isPresent(option)) {
    throw new Error('Parameter option must have a value');
  }

  if (!isObject(globalOptions)) {
    throw new Error('Parameter globalOptions must be an object');
  } //
  // Actual merge routine, separated from main logic
  // Only a single level of options is merged. Deeper levels are ref'd. This may actually be an issue.
  //


  var doMerge = function doMerge(target, options, option) {
    if (!isObject(target[option])) {
      target[option] = {};
    }

    var src = options[option];
    var dst = target[option];

    for (var prop in src) {
      if (Object.prototype.hasOwnProperty.call(src, prop)) {
        dst[prop] = src[prop];
      }
    }
  }; // Local initialization


  var srcOption = options[option];
  var globalPassed = isObject(globalOptions) && !isEmpty(globalOptions);
  var globalOption = globalPassed ? globalOptions[option] : undefined;
  var globalEnabled = globalOption ? globalOption.enabled : undefined; /////////////////////////////////////////
  // Main routine
  /////////////////////////////////////////

  if (srcOption === undefined) {
    return; // Nothing to do
  }

  if (typeof srcOption === 'boolean') {
    if (!isObject(mergeTarget[option])) {
      mergeTarget[option] = {};
    }

    mergeTarget[option].enabled = srcOption;
    return;
  }

  if (srcOption === null && !isObject(mergeTarget[option])) {
    // If possible, explicit copy from globals
    if (isPresent(globalOption)) {
      mergeTarget[option] = Object.create(globalOption);
    } else {
      return; // Nothing to do
    }
  }

  if (!isObject(srcOption)) {
    return;
  } //
  // Ensure that 'enabled' is properly set. It is required internally
  // Note that the value from options will always overwrite the existing value
  //


  var enabled = true; // default value

  if (srcOption.enabled !== undefined) {
    enabled = srcOption.enabled;
  } else {
    // Take from globals, if present
    if (globalEnabled !== undefined) {
      enabled = globalOption.enabled;
    }
  }

  doMerge(mergeTarget, options, option);
  mergeTarget[option].enabled = enabled;
}
/**
 * This function does a binary search for a visible item in a sorted list. If we find a visible item, the code that uses
 * this function will then iterate in both directions over this sorted list to find all visible items.
 *
 * @param orderedItems - Items ordered by start
 * @param comparator - -1 is lower, 0 is equal, 1 is higher
 * @param field - Property name on an item (i.e. item[field]).
 * @param field2 - Second property name on an item (i.e. item[field][field2]).
 *
 * @returns Index of the found item or -1 if nothing was found.
 */


function binarySearchCustom(orderedItems, comparator, field, field2) {
  var maxIterations = 10000;
  var iteration = 0;
  var low = 0;
  var high = orderedItems.length - 1;

  while (low <= high && iteration < maxIterations) {
    var middle = Math.floor((low + high) / 2);
    var item = orderedItems[middle];

    var _value3 = field2 === undefined ? item[field] : item[field][field2];

    var searchResult = comparator(_value3);

    if (searchResult == 0) {
      // jihaa, found a visible item!
      return middle;
    } else if (searchResult == -1) {
      // it is too small --> increase low
      low = middle + 1;
    } else {
      // it is too big --> decrease high
      high = middle - 1;
    }

    iteration++;
  }

  return -1;
}
/**
 * This function does a binary search for a specific value in a sorted array. If it does not exist but is in between of
 * two values, we return either the one before or the one after, depending on user input
 * If it is found, we return the index, else -1.
 *
 * @param orderedItems - Sorted array.
 * @param target - The searched value.
 * @param field - Name of the property in items to be searched.
 * @param sidePreference - If the target is between two values, should the index of the before or the after be returned?
 * @param comparator - An optional comparator, returning -1, 0, 1 for <, ===, >.
 *
 * @returns The index of found value or -1 if nothing was found.
 */


function binarySearchValue(orderedItems, target, field, sidePreference, comparator) {
  var maxIterations = 10000;
  var iteration = 0;
  var low = 0;
  var high = orderedItems.length - 1;
  var prevValue;
  var value;
  var nextValue;
  var middle;
  comparator = comparator != undefined ? comparator : function (a, b) {
    return a == b ? 0 : a < b ? -1 : 1;
  };

  while (low <= high && iteration < maxIterations) {
    // get a new guess
    middle = Math.floor(0.5 * (high + low));
    prevValue = orderedItems[Math.max(0, middle - 1)][field];
    value = orderedItems[middle][field];
    nextValue = orderedItems[Math.min(orderedItems.length - 1, middle + 1)][field];

    if (comparator(value, target) == 0) {
      // we found the target
      return middle;
    } else if (comparator(prevValue, target) < 0 && comparator(value, target) > 0) {
      // target is in between of the previous and the current
      return sidePreference == 'before' ? Math.max(0, middle - 1) : middle;
    } else if (comparator(value, target) < 0 && comparator(nextValue, target) > 0) {
      // target is in between of the current and the next
      return sidePreference == 'before' ? middle : Math.min(orderedItems.length - 1, middle + 1);
    } else {
      // didnt find the target, we need to change our boundaries.
      if (comparator(value, target) < 0) {
        // it is too small --> increase low
        low = middle + 1;
      } else {
        // it is too big --> decrease high
        high = middle - 1;
      }
    }

    iteration++;
  } // didnt find anything. Return -1.


  return -1;
}
/*
 * Easing Functions.
 * Only considering the t value for the range [0, 1] => [0, 1].
 *
 * Inspiration: from http://gizma.com/easing/
 * https://gist.github.com/gre/1650294
 */


var easingFunctions = {
  /**
   * no easing, no acceleration
   *
   * @param t - Time.
   *
   * @returns Value at time t.
   */
  linear: function linear(t) {
    return t;
  },

  /**
   * accelerating from zero velocity
   *
   * @param t - Time.
   *
   * @returns Value at time t.
   */
  easeInQuad: function easeInQuad(t) {
    return t * t;
  },

  /**
   * decelerating to zero velocity
   *
   * @param t - Time.
   *
   * @returns Value at time t.
   */
  easeOutQuad: function easeOutQuad(t) {
    return t * (2 - t);
  },

  /**
   * acceleration until halfway, then deceleration
   *
   * @param t - Time.
   *
   * @returns Value at time t.
   */
  easeInOutQuad: function easeInOutQuad(t) {
    return t < 0.5 ? 2 * t * t : -1 + (4 - 2 * t) * t;
  },

  /**
   * accelerating from zero velocity
   *
   * @param t - Time.
   *
   * @returns Value at time t.
   */
  easeInCubic: function easeInCubic(t) {
    return t * t * t;
  },

  /**
   * decelerating to zero velocity
   *
   * @param t - Time.
   *
   * @returns Value at time t.
   */
  easeOutCubic: function easeOutCubic(t) {
    return --t * t * t + 1;
  },

  /**
   * acceleration until halfway, then deceleration
   *
   * @param t - Time.
   *
   * @returns Value at time t.
   */
  easeInOutCubic: function easeInOutCubic(t) {
    return t < 0.5 ? 4 * t * t * t : (t - 1) * (2 * t - 2) * (2 * t - 2) + 1;
  },

  /**
   * accelerating from zero velocity
   *
   * @param t - Time.
   *
   * @returns Value at time t.
   */
  easeInQuart: function easeInQuart(t) {
    return t * t * t * t;
  },

  /**
   * decelerating to zero velocity
   *
   * @param t - Time.
   *
   * @returns Value at time t.
   */
  easeOutQuart: function easeOutQuart(t) {
    return 1 - --t * t * t * t;
  },

  /**
   * acceleration until halfway, then deceleration
   *
   * @param t - Time.
   *
   * @returns Value at time t.
   */
  easeInOutQuart: function easeInOutQuart(t) {
    return t < 0.5 ? 8 * t * t * t * t : 1 - 8 * --t * t * t * t;
  },

  /**
   * accelerating from zero velocity
   *
   * @param t - Time.
   *
   * @returns Value at time t.
   */
  easeInQuint: function easeInQuint(t) {
    return t * t * t * t * t;
  },

  /**
   * decelerating to zero velocity
   *
   * @param t - Time.
   *
   * @returns Value at time t.
   */
  easeOutQuint: function easeOutQuint(t) {
    return 1 + --t * t * t * t * t;
  },

  /**
   * acceleration until halfway, then deceleration
   *
   * @param t - Time.
   *
   * @returns Value at time t.
   */
  easeInOutQuint: function easeInOutQuint(t) {
    return t < 0.5 ? 16 * t * t * t * t * t : 1 + 16 * --t * t * t * t * t;
  }
};
/**
 * Experimentaly compute the width of the scrollbar for this browser.
 *
 * @returns The width in pixels.
 */

function getScrollBarWidth() {
  var inner = document.createElement('p');
  inner.style.width = '100%';
  inner.style.height = '200px';
  var outer = document.createElement('div');
  outer.style.position = 'absolute';
  outer.style.top = '0px';
  outer.style.left = '0px';
  outer.style.visibility = 'hidden';
  outer.style.width = '200px';
  outer.style.height = '150px';
  outer.style.overflow = 'hidden';
  outer.appendChild(inner);
  document.body.appendChild(outer);
  var w1 = inner.offsetWidth;
  outer.style.overflow = 'scroll';
  var w2 = inner.offsetWidth;

  if (w1 == w2) {
    w2 = outer.clientWidth;
  }

  document.body.removeChild(outer);
  return w1 - w2;
} // @TODO: This doesn't work properly.
// It works only for single property objects,
// otherwise it combines all of the types in a union.
// export function topMost<K1 extends string, V1> (
//   pile: Record<K1, undefined | V1>[],
//   accessors: K1 | [K1]
// ): undefined | V1
// export function topMost<K1 extends string, K2 extends string, V1, V2> (
//   pile: Record<K1, undefined | V1 | Record<K2, undefined | V2>>[],
//   accessors: [K1, K2]
// ): undefined | V1 | V2
// export function topMost<K1 extends string, K2 extends string, K3 extends string, V1, V2, V3> (
//   pile: Record<K1, undefined | V1 | Record<K2, undefined | V2 | Record<K3, undefined | V3>>>[],
//   accessors: [K1, K2, K3]
// ): undefined | V1 | V2 | V3

/**
 * Get the top most property value from a pile of objects.
 *
 * @param pile - Array of objects, no required format.
 * @param accessors - Array of property names (e.g. object['foo']['bar'] → ['foo', 'bar']).
 *
 * @returns Value of the property with given accessors path from the first pile item where it's not undefined.
 */


function topMost(pile, accessors) {
  var candidate;

  if (!Array.isArray(accessors)) {
    accessors = [accessors];
  }

  var _iteratorNormalCompletion = true;
  var _didIteratorError = false;
  var _iteratorError = undefined;

  try {
    for (var _iterator = pile[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
      var member = _step.value;

      if (member) {
        candidate = member[accessors[0]];

        for (var i = 1; i < accessors.length; i++) {
          if (candidate) {
            candidate = candidate[accessors[i]];
          }
        }

        if (typeof candidate !== 'undefined') {
          break;
        }
      }
    }
  } catch (err) {
    _didIteratorError = true;
    _iteratorError = err;
  } finally {
    try {
      if (!_iteratorNormalCompletion && _iterator.return != null) {
        _iterator.return();
      }
    } finally {
      if (_didIteratorError) {
        throw _iteratorError;
      }
    }
  }

  return candidate;
}

var util =
/*#__PURE__*/
Object.freeze({
  isNumber: isNumber,
  recursiveDOMDelete: recursiveDOMDelete,
  isString: isString,
  isObject: isObject,
  isDate: isDate,
  isMoment: isMoment,
  fillIfDefined: fillIfDefined,
  extend: extend,
  selectiveExtend: selectiveExtend,
  selectiveDeepExtend: selectiveDeepExtend,
  selectiveNotDeepExtend: selectiveNotDeepExtend,
  deepExtend: deepExtend,
  equalArray: equalArray,
  convert: convert,
  getType: getType,
  copyAndExtendArray: copyAndExtendArray,
  copyArray: copyArray,
  getAbsoluteLeft: getAbsoluteLeft,
  getAbsoluteRight: getAbsoluteRight,
  getAbsoluteTop: getAbsoluteTop,
  addClassName: addClassName,
  removeClassName: removeClassName,
  forEach: forEach,
  toArray: toArray,
  updateProperty: updateProperty,
  throttle: throttle,
  addEventListener: addEventListener,
  removeEventListener: removeEventListener,
  preventDefault: preventDefault,
  getTarget: getTarget,
  hasParent: hasParent,
  option: option,
  hexToRGB: hexToRGB,
  overrideOpacity: overrideOpacity,
  RGBToHex: RGBToHex,
  parseColor: parseColor,
  RGBToHSV: RGBToHSV,
  addCssText: addCssText,
  removeCssText: removeCssText,
  HSVToRGB: HSVToRGB,
  HSVToHex: HSVToHex,
  hexToHSV: hexToHSV,
  isValidHex: isValidHex,
  isValidRGB: isValidRGB,
  isValidRGBA: isValidRGBA,
  selectiveBridgeObject: selectiveBridgeObject,
  bridgeObject: bridgeObject,
  insertSort: insertSort,
  mergeOptions: mergeOptions,
  binarySearchCustom: binarySearchCustom,
  binarySearchValue: binarySearchValue,
  easingFunctions: easingFunctions,
  getScrollBarWidth: getScrollBarWidth,
  topMost: topMost,
  randomUUID: uuid4
}); // New API (tree shakeable).

var commonjsGlobal$1 = typeof globalThis !== 'undefined' ? globalThis : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};

function commonjsRequire$1 () {
	throw new Error('Dynamic requires are not currently supported by rollup-plugin-commonjs');
}

function createCommonjsModule$1(fn, module) {
	return module = { exports: {} }, fn(module, module.exports), module.exports;
}

var DOMutil = createCommonjsModule$1(function (module, exports) {
  // DOM utility methods

  /**
   * this prepares the JSON container for allocating SVG elements
   * @param {Object} JSONcontainer
   * @private
   */
  exports.prepareElements = function (JSONcontainer) {
    // cleanup the redundant svgElements;
    for (var elementType in JSONcontainer) {
      if (JSONcontainer.hasOwnProperty(elementType)) {
        JSONcontainer[elementType].redundant = JSONcontainer[elementType].used;
        JSONcontainer[elementType].used = [];
      }
    }
  };
  /**
   * this cleans up all the unused SVG elements. By asking for the parentNode, we only need to supply the JSON container from
   * which to remove the redundant elements.
   *
   * @param {Object} JSONcontainer
   * @private
   */


  exports.cleanupElements = function (JSONcontainer) {
    // cleanup the redundant svgElements;
    for (var elementType in JSONcontainer) {
      if (JSONcontainer.hasOwnProperty(elementType)) {
        if (JSONcontainer[elementType].redundant) {
          for (var i = 0; i < JSONcontainer[elementType].redundant.length; i++) {
            JSONcontainer[elementType].redundant[i].parentNode.removeChild(JSONcontainer[elementType].redundant[i]);
          }

          JSONcontainer[elementType].redundant = [];
        }
      }
    }
  };
  /**
   * Ensures that all elements are removed first up so they can be recreated cleanly
   * @param {Object} JSONcontainer
   */


  exports.resetElements = function (JSONcontainer) {
    exports.prepareElements(JSONcontainer);
    exports.cleanupElements(JSONcontainer);
    exports.prepareElements(JSONcontainer);
  };
  /**
   * Allocate or generate an SVG element if needed. Store a reference to it in the JSON container and draw it in the svgContainer
   * the JSON container and the SVG container have to be supplied so other svg containers (like the legend) can use this.
   *
   * @param {string} elementType
   * @param {Object} JSONcontainer
   * @param {Object} svgContainer
   * @returns {Element}
   * @private
   */


  exports.getSVGElement = function (elementType, JSONcontainer, svgContainer) {
    var element; // allocate SVG element, if it doesnt yet exist, create one.

    if (JSONcontainer.hasOwnProperty(elementType)) {
      // this element has been created before
      // check if there is an redundant element
      if (JSONcontainer[elementType].redundant.length > 0) {
        element = JSONcontainer[elementType].redundant[0];
        JSONcontainer[elementType].redundant.shift();
      } else {
        // create a new element and add it to the SVG
        element = document.createElementNS('http://www.w3.org/2000/svg', elementType);
        svgContainer.appendChild(element);
      }
    } else {
      // create a new element and add it to the SVG, also create a new object in the svgElements to keep track of it.
      element = document.createElementNS('http://www.w3.org/2000/svg', elementType);
      JSONcontainer[elementType] = {
        used: [],
        redundant: []
      };
      svgContainer.appendChild(element);
    }

    JSONcontainer[elementType].used.push(element);
    return element;
  };
  /**
   * Allocate or generate an SVG element if needed. Store a reference to it in the JSON container and draw it in the svgContainer
   * the JSON container and the SVG container have to be supplied so other svg containers (like the legend) can use this.
   *
   * @param {string} elementType
   * @param {Object} JSONcontainer
   * @param {Element} DOMContainer
   * @param {Element} insertBefore
   * @returns {*}
   */


  exports.getDOMElement = function (elementType, JSONcontainer, DOMContainer, insertBefore) {
    var element; // allocate DOM element, if it doesnt yet exist, create one.

    if (JSONcontainer.hasOwnProperty(elementType)) {
      // this element has been created before
      // check if there is an redundant element
      if (JSONcontainer[elementType].redundant.length > 0) {
        element = JSONcontainer[elementType].redundant[0];
        JSONcontainer[elementType].redundant.shift();
      } else {
        // create a new element and add it to the SVG
        element = document.createElement(elementType);

        if (insertBefore !== undefined) {
          DOMContainer.insertBefore(element, insertBefore);
        } else {
          DOMContainer.appendChild(element);
        }
      }
    } else {
      // create a new element and add it to the SVG, also create a new object in the svgElements to keep track of it.
      element = document.createElement(elementType);
      JSONcontainer[elementType] = {
        used: [],
        redundant: []
      };

      if (insertBefore !== undefined) {
        DOMContainer.insertBefore(element, insertBefore);
      } else {
        DOMContainer.appendChild(element);
      }
    }

    JSONcontainer[elementType].used.push(element);
    return element;
  };
  /**
   * Draw a point object. This is a separate function because it can also be called by the legend.
   * The reason the JSONcontainer and the target SVG svgContainer have to be supplied is so the legend can use these functions
   * as well.
   *
   * @param {number} x
   * @param {number} y
   * @param {Object} groupTemplate: A template containing the necessary information to draw the datapoint e.g., {style: 'circle', size: 5, className: 'className' }
   * @param {Object} JSONcontainer
   * @param {Object} svgContainer
   * @param {Object} labelObj
   * @returns {vis.PointItem}
   */


  exports.drawPoint = function (x, y, groupTemplate, JSONcontainer, svgContainer, labelObj) {
    var point;

    if (groupTemplate.style == 'circle') {
      point = exports.getSVGElement('circle', JSONcontainer, svgContainer);
      point.setAttributeNS(null, "cx", x);
      point.setAttributeNS(null, "cy", y);
      point.setAttributeNS(null, "r", 0.5 * groupTemplate.size);
    } else {
      point = exports.getSVGElement('rect', JSONcontainer, svgContainer);
      point.setAttributeNS(null, "x", x - 0.5 * groupTemplate.size);
      point.setAttributeNS(null, "y", y - 0.5 * groupTemplate.size);
      point.setAttributeNS(null, "width", groupTemplate.size);
      point.setAttributeNS(null, "height", groupTemplate.size);
    }

    if (groupTemplate.styles !== undefined) {
      point.setAttributeNS(null, "style", groupTemplate.styles);
    }

    point.setAttributeNS(null, "class", groupTemplate.className + " vis-point"); //handle label

    if (labelObj) {
      var label = exports.getSVGElement('text', JSONcontainer, svgContainer);

      if (labelObj.xOffset) {
        x = x + labelObj.xOffset;
      }

      if (labelObj.yOffset) {
        y = y + labelObj.yOffset;
      }

      if (labelObj.content) {
        label.textContent = labelObj.content;
      }

      if (labelObj.className) {
        label.setAttributeNS(null, "class", labelObj.className + " vis-label");
      }

      label.setAttributeNS(null, "x", x);
      label.setAttributeNS(null, "y", y);
    }

    return point;
  };
  /**
   * draw a bar SVG element centered on the X coordinate
   *
   * @param {number} x
   * @param {number} y
   * @param {number} width
   * @param {number} height
   * @param {string} className
   * @param {Object} JSONcontainer
   * @param {Object} svgContainer
   * @param {string} style
   */


  exports.drawBar = function (x, y, width, height, className, JSONcontainer, svgContainer, style) {
    if (height != 0) {
      if (height < 0) {
        height *= -1;
        y -= height;
      }

      var rect = exports.getSVGElement('rect', JSONcontainer, svgContainer);
      rect.setAttributeNS(null, "x", x - 0.5 * width);
      rect.setAttributeNS(null, "y", y);
      rect.setAttributeNS(null, "width", width);
      rect.setAttributeNS(null, "height", height);
      rect.setAttributeNS(null, "class", className);

      if (style) {
        rect.setAttributeNS(null, "style", style);
      }
    }
  };
});
var DOMutil_1 = DOMutil.prepareElements;
var DOMutil_2 = DOMutil.cleanupElements;
var DOMutil_3 = DOMutil.resetElements;
var DOMutil_4 = DOMutil.getSVGElement;
var DOMutil_5 = DOMutil.getDOMElement;
var DOMutil_6 = DOMutil.drawPoint;
var DOMutil_7 = DOMutil.drawBar;

/** 
 * vis-data - data
 * http://visjs.org/
 * 
 * Manage unstructured data using DataSet. Add, update, and remove data, and listen for changes in the data.
 * 
 * @version 6.1.0
 * @date    2019-07-16T13:37:00Z
 * 
 * @copyright (c) 2011-2017 Almende B.V, http://almende.com
 * @copyright (c) 2018-2019 visjs contributors, https://github.com/visjs
 * 
 * @license 
 * vis.js is dual licensed under both
 * 
 *   1. The Apache 2.0 License
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 *   and
 * 
 *   2. The MIT License
 *      http://opensource.org/licenses/MIT
 * 
 * vis.js may be distributed under either license.
 */
function _defineProperty$1(obj, key, value) {
  if (key in obj) {
    Object.defineProperty(obj, key, {
      value: value,
      enumerable: true,
      configurable: true,
      writable: true
    });
  } else {
    obj[key] = value;
  }

  return obj;
}

var defineProperty$1 = _defineProperty$1;

function createCommonjsModule$2(fn, module) {
  return module = {
    exports: {}
  }, fn(module, module.exports), module.exports;
}

var _typeof_1$1 = createCommonjsModule$2(function (module) {
  function _typeof2(obj) {
    if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
      _typeof2 = function _typeof2(obj) {
        return typeof obj;
      };
    } else {
      _typeof2 = function _typeof2(obj) {
        return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
      };
    }

    return _typeof2(obj);
  }

  function _typeof(obj) {
    if (typeof Symbol === "function" && _typeof2(Symbol.iterator) === "symbol") {
      module.exports = _typeof = function _typeof(obj) {
        return _typeof2(obj);
      };
    } else {
      module.exports = _typeof = function _typeof(obj) {
        return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : _typeof2(obj);
      };
    }

    return _typeof(obj);
  }

  module.exports = _typeof;
});

function _classCallCheck(instance, Constructor) {
  if (!(instance instanceof Constructor)) {
    throw new TypeError("Cannot call a class as a function");
  }
}

var classCallCheck = _classCallCheck;

function _defineProperties(target, props) {
  for (var i = 0; i < props.length; i++) {
    var descriptor = props[i];
    descriptor.enumerable = descriptor.enumerable || false;
    descriptor.configurable = true;
    if ("value" in descriptor) descriptor.writable = true;
    Object.defineProperty(target, descriptor.key, descriptor);
  }
}

function _createClass(Constructor, protoProps, staticProps) {
  if (protoProps) _defineProperties(Constructor.prototype, protoProps);
  if (staticProps) _defineProperties(Constructor, staticProps);
  return Constructor;
}

var createClass = _createClass;

function _assertThisInitialized(self) {
  if (self === void 0) {
    throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
  }

  return self;
}

var assertThisInitialized = _assertThisInitialized;

function _possibleConstructorReturn(self, call) {
  if (call && (_typeof_1$1(call) === "object" || typeof call === "function")) {
    return call;
  }

  return assertThisInitialized(self);
}

var possibleConstructorReturn = _possibleConstructorReturn;
var getPrototypeOf = createCommonjsModule$2(function (module) {
  function _getPrototypeOf(o) {
    module.exports = _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) {
      return o.__proto__ || Object.getPrototypeOf(o);
    };
    return _getPrototypeOf(o);
  }

  module.exports = _getPrototypeOf;
});
var setPrototypeOf = createCommonjsModule$2(function (module) {
  function _setPrototypeOf(o, p) {
    module.exports = _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) {
      o.__proto__ = p;
      return o;
    };

    return _setPrototypeOf(o, p);
  }

  module.exports = _setPrototypeOf;
});

function _inherits(subClass, superClass) {
  if (typeof superClass !== "function" && superClass !== null) {
    throw new TypeError("Super expression must either be null or a function");
  }

  subClass.prototype = Object.create(superClass && superClass.prototype, {
    constructor: {
      value: subClass,
      writable: true,
      configurable: true
    }
  });
  if (superClass) setPrototypeOf(subClass, superClass);
}

var inherits = _inherits; // Maps for number <-> hex string conversion

var byteToHex$2 = [];

for (var i$2 = 0; i$2 < 256; i$2++) {
  byteToHex$2[i$2] = (i$2 + 0x100).toString(16).substr(1);
}
/**
 * Represent binary UUID into it's string representation.
 *
 * @param buf - Buffer containing UUID bytes.
 * @param offset - Offset from the start of the buffer where the UUID is saved (not needed if the buffer starts with the UUID).
 *
 * @returns String representation of the UUID.
 */


function stringifyUUID$1(buf, offset) {
  var i = offset || 0;
  var bth = byteToHex$2;
  return bth[buf[i++]] + bth[buf[i++]] + bth[buf[i++]] + bth[buf[i++]] + '-' + bth[buf[i++]] + bth[buf[i++]] + '-' + bth[buf[i++]] + bth[buf[i++]] + '-' + bth[buf[i++]] + bth[buf[i++]] + '-' + bth[buf[i++]] + bth[buf[i++]] + bth[buf[i++]] + bth[buf[i++]] + bth[buf[i++]] + bth[buf[i++]];
}
/**
 * Generate 16 random bytes to be used as a base for UUID.
 *
 * @ignore
 */


var random$1 = function () {
  if (typeof crypto !== 'undefined' && crypto.getRandomValues) {
    // WHATWG crypto-based RNG - http://wiki.whatwg.org/wiki/Crypto
    // Moderately fast, high quality
    var _rnds8 = new Uint8Array(16);

    return function whatwgRNG() {
      crypto.getRandomValues(_rnds8);
      return _rnds8;
    };
  } // Math.random()-based (RNG)
  //
  // If all else fails, use Math.random().
  // It's fast, but is of unspecified quality.


  var _rnds = new Array(16);

  return function () {
    for (var i = 0, r; i < 16; i++) {
      if ((i & 0x03) === 0) {
        r = Math.random() * 0x100000000;
      }

      _rnds[i] = r >>> ((i & 0x03) << 3) & 0xff;
    }

    return _rnds;
  }; //     uuid.js
  //
  //     Copyright (c) 2010-2012 Robert Kieffer
  //     MIT License - http://opensource.org/licenses/mit-license.php
  // Unique ID creation requires a high quality random # generator.  We feature
  // detect to determine the best RNG source, normalizing to a function that
  // returns 128-bits of randomness, since that's what's usually required
  // return require('./rng');
}();

var byteToHex$1$1 = [];

for (var i$1$1 = 0; i$1$1 < 256; i$1$1++) {
  byteToHex$1$1[i$1$1] = (i$1$1 + 0x100).toString(16).substr(1);
} // **`v1()` - Generate time-based UUID**
//
// Inspired by https://github.com/LiosK/UUID.js
// and http://docs.python.org/library/uuid.html
// random #'s we need to init node and clockseq


var seedBytes$1 = random$1(); // Per 4.5, create and 48-bit node id, (47 random bits + multicast bit = 1)

var defaultNodeId$1 = [seedBytes$1[0] | 0x01, seedBytes$1[1], seedBytes$1[2], seedBytes$1[3], seedBytes$1[4], seedBytes$1[5]]; // Per 4.2.2, randomize (14 bit) clockseq

var defaultClockseq$1 = (seedBytes$1[6] << 8 | seedBytes$1[7]) & 0x3fff; // Previous uuid creation time

/**
 * UUIDv4 options.
 */

/**
 * Generate UUIDv4
 *
 * @param options - Options to be used instead of default generated values.
 * String 'binary' is a shorthand for uuid4({}, new Array(16)).
 * @param buf - If present the buffer will be filled with the generated UUID.
 * @param offset - Offset of the UUID from the start of the buffer.
 *
 * @returns UUIDv4
 */

function uuid4$1() {
  var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
  var buf = arguments.length > 1 ? arguments[1] : undefined;
  var offset = arguments.length > 2 ? arguments[2] : undefined; // Deprecated - 'format' argument, as supported in v1.2

  var i = buf && offset || 0;

  if (typeof options === 'string') {
    buf = options === 'binary' ? new Array(16) : undefined;
    options = {};
  }

  var rnds = options.random || (options.rng || random$1)(); // Per 4.4, set bits for version and `clock_seq_hi_and_reserved`

  rnds[6] = rnds[6] & 0x0f | 0x40;
  rnds[8] = rnds[8] & 0x3f | 0x80; // Copy bytes to buffer, if provided

  if (buf) {
    for (var ii = 0; ii < 16; ii++) {
      buf[i + ii] = rnds[ii];
    }
  }

  return buf || stringifyUUID$1(rnds);
} // Rollup will complain about mixing default and named exports in UMD build,


function _typeof(obj) {
  if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
    _typeof = function (obj) {
      return typeof obj;
    };
  } else {
    _typeof = function (obj) {
      return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
    };
  }

  return _typeof(obj);
}

var commonjsGlobal$2 = typeof globalThis !== 'undefined' ? globalThis : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};

function commonjsRequire$2() {
  throw new Error('Dynamic requires are not currently supported by rollup-plugin-commonjs');
}

function createCommonjsModule$1$1(fn, module) {
  return module = {
    exports: {}
  }, fn(module, module.exports), module.exports;
}

var moment$1 = createCommonjsModule$1$1(function (module, exports) {
  (function (global, factory) {
    module.exports = factory();
  })(commonjsGlobal$2, function () {
    var hookCallback;

    function hooks() {
      return hookCallback.apply(null, arguments);
    } // This is done to register the method called with moment()
    // without creating circular dependencies.


    function setHookCallback(callback) {
      hookCallback = callback;
    }

    function isArray(input) {
      return input instanceof Array || Object.prototype.toString.call(input) === '[object Array]';
    }

    function isObject(input) {
      // IE8 will treat undefined and null as object if it wasn't for
      // input != null
      return input != null && Object.prototype.toString.call(input) === '[object Object]';
    }

    function isObjectEmpty(obj) {
      if (Object.getOwnPropertyNames) {
        return Object.getOwnPropertyNames(obj).length === 0;
      } else {
        var k;

        for (k in obj) {
          if (obj.hasOwnProperty(k)) {
            return false;
          }
        }

        return true;
      }
    }

    function isUndefined(input) {
      return input === void 0;
    }

    function isNumber(input) {
      return typeof input === 'number' || Object.prototype.toString.call(input) === '[object Number]';
    }

    function isDate(input) {
      return input instanceof Date || Object.prototype.toString.call(input) === '[object Date]';
    }

    function map(arr, fn) {
      var res = [],
          i;

      for (i = 0; i < arr.length; ++i) {
        res.push(fn(arr[i], i));
      }

      return res;
    }

    function hasOwnProp(a, b) {
      return Object.prototype.hasOwnProperty.call(a, b);
    }

    function extend(a, b) {
      for (var i in b) {
        if (hasOwnProp(b, i)) {
          a[i] = b[i];
        }
      }

      if (hasOwnProp(b, 'toString')) {
        a.toString = b.toString;
      }

      if (hasOwnProp(b, 'valueOf')) {
        a.valueOf = b.valueOf;
      }

      return a;
    }

    function createUTC(input, format, locale, strict) {
      return createLocalOrUTC(input, format, locale, strict, true).utc();
    }

    function defaultParsingFlags() {
      // We need to deep clone this object.
      return {
        empty: false,
        unusedTokens: [],
        unusedInput: [],
        overflow: -2,
        charsLeftOver: 0,
        nullInput: false,
        invalidMonth: null,
        invalidFormat: false,
        userInvalidated: false,
        iso: false,
        parsedDateParts: [],
        meridiem: null,
        rfc2822: false,
        weekdayMismatch: false
      };
    }

    function getParsingFlags(m) {
      if (m._pf == null) {
        m._pf = defaultParsingFlags();
      }

      return m._pf;
    }

    var some;

    if (Array.prototype.some) {
      some = Array.prototype.some;
    } else {
      some = function (fun) {
        var t = Object(this);
        var len = t.length >>> 0;

        for (var i = 0; i < len; i++) {
          if (i in t && fun.call(this, t[i], i, t)) {
            return true;
          }
        }

        return false;
      };
    }

    function isValid(m) {
      if (m._isValid == null) {
        var flags = getParsingFlags(m);
        var parsedParts = some.call(flags.parsedDateParts, function (i) {
          return i != null;
        });
        var isNowValid = !isNaN(m._d.getTime()) && flags.overflow < 0 && !flags.empty && !flags.invalidMonth && !flags.invalidWeekday && !flags.weekdayMismatch && !flags.nullInput && !flags.invalidFormat && !flags.userInvalidated && (!flags.meridiem || flags.meridiem && parsedParts);

        if (m._strict) {
          isNowValid = isNowValid && flags.charsLeftOver === 0 && flags.unusedTokens.length === 0 && flags.bigHour === undefined;
        }

        if (Object.isFrozen == null || !Object.isFrozen(m)) {
          m._isValid = isNowValid;
        } else {
          return isNowValid;
        }
      }

      return m._isValid;
    }

    function createInvalid(flags) {
      var m = createUTC(NaN);

      if (flags != null) {
        extend(getParsingFlags(m), flags);
      } else {
        getParsingFlags(m).userInvalidated = true;
      }

      return m;
    } // Plugins that add properties should also add the key here (null value),
    // so we can properly clone ourselves.


    var momentProperties = hooks.momentProperties = [];

    function copyConfig(to, from) {
      var i, prop, val;

      if (!isUndefined(from._isAMomentObject)) {
        to._isAMomentObject = from._isAMomentObject;
      }

      if (!isUndefined(from._i)) {
        to._i = from._i;
      }

      if (!isUndefined(from._f)) {
        to._f = from._f;
      }

      if (!isUndefined(from._l)) {
        to._l = from._l;
      }

      if (!isUndefined(from._strict)) {
        to._strict = from._strict;
      }

      if (!isUndefined(from._tzm)) {
        to._tzm = from._tzm;
      }

      if (!isUndefined(from._isUTC)) {
        to._isUTC = from._isUTC;
      }

      if (!isUndefined(from._offset)) {
        to._offset = from._offset;
      }

      if (!isUndefined(from._pf)) {
        to._pf = getParsingFlags(from);
      }

      if (!isUndefined(from._locale)) {
        to._locale = from._locale;
      }

      if (momentProperties.length > 0) {
        for (i = 0; i < momentProperties.length; i++) {
          prop = momentProperties[i];
          val = from[prop];

          if (!isUndefined(val)) {
            to[prop] = val;
          }
        }
      }

      return to;
    }

    var updateInProgress = false; // Moment prototype object

    function Moment(config) {
      copyConfig(this, config);
      this._d = new Date(config._d != null ? config._d.getTime() : NaN);

      if (!this.isValid()) {
        this._d = new Date(NaN);
      } // Prevent infinite loop in case updateOffset creates new moment
      // objects.


      if (updateInProgress === false) {
        updateInProgress = true;
        hooks.updateOffset(this);
        updateInProgress = false;
      }
    }

    function isMoment(obj) {
      return obj instanceof Moment || obj != null && obj._isAMomentObject != null;
    }

    function absFloor(number) {
      if (number < 0) {
        // -0 -> 0
        return Math.ceil(number) || 0;
      } else {
        return Math.floor(number);
      }
    }

    function toInt(argumentForCoercion) {
      var coercedNumber = +argumentForCoercion,
          value = 0;

      if (coercedNumber !== 0 && isFinite(coercedNumber)) {
        value = absFloor(coercedNumber);
      }

      return value;
    } // compare two arrays, return the number of differences


    function compareArrays(array1, array2, dontConvert) {
      var len = Math.min(array1.length, array2.length),
          lengthDiff = Math.abs(array1.length - array2.length),
          diffs = 0,
          i;

      for (i = 0; i < len; i++) {
        if (dontConvert && array1[i] !== array2[i] || !dontConvert && toInt(array1[i]) !== toInt(array2[i])) {
          diffs++;
        }
      }

      return diffs + lengthDiff;
    }

    function warn(msg) {
      if (hooks.suppressDeprecationWarnings === false && typeof console !== 'undefined' && console.warn) {
        console.warn('Deprecation warning: ' + msg);
      }
    }

    function deprecate(msg, fn) {
      var firstTime = true;
      return extend(function () {
        if (hooks.deprecationHandler != null) {
          hooks.deprecationHandler(null, msg);
        }

        if (firstTime) {
          var args = [];
          var arg;

          for (var i = 0; i < arguments.length; i++) {
            arg = '';

            if (typeof arguments[i] === 'object') {
              arg += '\n[' + i + '] ';

              for (var key in arguments[0]) {
                arg += key + ': ' + arguments[0][key] + ', ';
              }

              arg = arg.slice(0, -2); // Remove trailing comma and space
            } else {
              arg = arguments[i];
            }

            args.push(arg);
          }

          warn(msg + '\nArguments: ' + Array.prototype.slice.call(args).join('') + '\n' + new Error().stack);
          firstTime = false;
        }

        return fn.apply(this, arguments);
      }, fn);
    }

    var deprecations = {};

    function deprecateSimple(name, msg) {
      if (hooks.deprecationHandler != null) {
        hooks.deprecationHandler(name, msg);
      }

      if (!deprecations[name]) {
        warn(msg);
        deprecations[name] = true;
      }
    }

    hooks.suppressDeprecationWarnings = false;
    hooks.deprecationHandler = null;

    function isFunction(input) {
      return input instanceof Function || Object.prototype.toString.call(input) === '[object Function]';
    }

    function set(config) {
      var prop, i;

      for (i in config) {
        prop = config[i];

        if (isFunction(prop)) {
          this[i] = prop;
        } else {
          this['_' + i] = prop;
        }
      }

      this._config = config; // Lenient ordinal parsing accepts just a number in addition to
      // number + (possibly) stuff coming from _dayOfMonthOrdinalParse.
      // TODO: Remove "ordinalParse" fallback in next major release.

      this._dayOfMonthOrdinalParseLenient = new RegExp((this._dayOfMonthOrdinalParse.source || this._ordinalParse.source) + '|' + /\d{1,2}/.source);
    }

    function mergeConfigs(parentConfig, childConfig) {
      var res = extend({}, parentConfig),
          prop;

      for (prop in childConfig) {
        if (hasOwnProp(childConfig, prop)) {
          if (isObject(parentConfig[prop]) && isObject(childConfig[prop])) {
            res[prop] = {};
            extend(res[prop], parentConfig[prop]);
            extend(res[prop], childConfig[prop]);
          } else if (childConfig[prop] != null) {
            res[prop] = childConfig[prop];
          } else {
            delete res[prop];
          }
        }
      }

      for (prop in parentConfig) {
        if (hasOwnProp(parentConfig, prop) && !hasOwnProp(childConfig, prop) && isObject(parentConfig[prop])) {
          // make sure changes to properties don't modify parent config
          res[prop] = extend({}, res[prop]);
        }
      }

      return res;
    }

    function Locale(config) {
      if (config != null) {
        this.set(config);
      }
    }

    var keys;

    if (Object.keys) {
      keys = Object.keys;
    } else {
      keys = function (obj) {
        var i,
            res = [];

        for (i in obj) {
          if (hasOwnProp(obj, i)) {
            res.push(i);
          }
        }

        return res;
      };
    }

    var defaultCalendar = {
      sameDay: '[Today at] LT',
      nextDay: '[Tomorrow at] LT',
      nextWeek: 'dddd [at] LT',
      lastDay: '[Yesterday at] LT',
      lastWeek: '[Last] dddd [at] LT',
      sameElse: 'L'
    };

    function calendar(key, mom, now) {
      var output = this._calendar[key] || this._calendar['sameElse'];
      return isFunction(output) ? output.call(mom, now) : output;
    }

    var defaultLongDateFormat = {
      LTS: 'h:mm:ss A',
      LT: 'h:mm A',
      L: 'MM/DD/YYYY',
      LL: 'MMMM D, YYYY',
      LLL: 'MMMM D, YYYY h:mm A',
      LLLL: 'dddd, MMMM D, YYYY h:mm A'
    };

    function longDateFormat(key) {
      var format = this._longDateFormat[key],
          formatUpper = this._longDateFormat[key.toUpperCase()];

      if (format || !formatUpper) {
        return format;
      }

      this._longDateFormat[key] = formatUpper.replace(/MMMM|MM|DD|dddd/g, function (val) {
        return val.slice(1);
      });
      return this._longDateFormat[key];
    }

    var defaultInvalidDate = 'Invalid date';

    function invalidDate() {
      return this._invalidDate;
    }

    var defaultOrdinal = '%d';
    var defaultDayOfMonthOrdinalParse = /\d{1,2}/;

    function ordinal(number) {
      return this._ordinal.replace('%d', number);
    }

    var defaultRelativeTime = {
      future: 'in %s',
      past: '%s ago',
      s: 'a few seconds',
      ss: '%d seconds',
      m: 'a minute',
      mm: '%d minutes',
      h: 'an hour',
      hh: '%d hours',
      d: 'a day',
      dd: '%d days',
      M: 'a month',
      MM: '%d months',
      y: 'a year',
      yy: '%d years'
    };

    function relativeTime(number, withoutSuffix, string, isFuture) {
      var output = this._relativeTime[string];
      return isFunction(output) ? output(number, withoutSuffix, string, isFuture) : output.replace(/%d/i, number);
    }

    function pastFuture(diff, output) {
      var format = this._relativeTime[diff > 0 ? 'future' : 'past'];
      return isFunction(format) ? format(output) : format.replace(/%s/i, output);
    }

    var aliases = {};

    function addUnitAlias(unit, shorthand) {
      var lowerCase = unit.toLowerCase();
      aliases[lowerCase] = aliases[lowerCase + 's'] = aliases[shorthand] = unit;
    }

    function normalizeUnits(units) {
      return typeof units === 'string' ? aliases[units] || aliases[units.toLowerCase()] : undefined;
    }

    function normalizeObjectUnits(inputObject) {
      var normalizedInput = {},
          normalizedProp,
          prop;

      for (prop in inputObject) {
        if (hasOwnProp(inputObject, prop)) {
          normalizedProp = normalizeUnits(prop);

          if (normalizedProp) {
            normalizedInput[normalizedProp] = inputObject[prop];
          }
        }
      }

      return normalizedInput;
    }

    var priorities = {};

    function addUnitPriority(unit, priority) {
      priorities[unit] = priority;
    }

    function getPrioritizedUnits(unitsObj) {
      var units = [];

      for (var u in unitsObj) {
        units.push({
          unit: u,
          priority: priorities[u]
        });
      }

      units.sort(function (a, b) {
        return a.priority - b.priority;
      });
      return units;
    }

    function zeroFill(number, targetLength, forceSign) {
      var absNumber = '' + Math.abs(number),
          zerosToFill = targetLength - absNumber.length,
          sign = number >= 0;
      return (sign ? forceSign ? '+' : '' : '-') + Math.pow(10, Math.max(0, zerosToFill)).toString().substr(1) + absNumber;
    }

    var formattingTokens = /(\[[^\[]*\])|(\\)?([Hh]mm(ss)?|Mo|MM?M?M?|Do|DDDo|DD?D?D?|ddd?d?|do?|w[o|w]?|W[o|W]?|Qo?|YYYYYY|YYYYY|YYYY|YY|gg(ggg?)?|GG(GGG?)?|e|E|a|A|hh?|HH?|kk?|mm?|ss?|S{1,9}|x|X|zz?|ZZ?|.)/g;
    var localFormattingTokens = /(\[[^\[]*\])|(\\)?(LTS|LT|LL?L?L?|l{1,4})/g;
    var formatFunctions = {};
    var formatTokenFunctions = {}; // token:    'M'
    // padded:   ['MM', 2]
    // ordinal:  'Mo'
    // callback: function () { this.month() + 1 }

    function addFormatToken(token, padded, ordinal, callback) {
      var func = callback;

      if (typeof callback === 'string') {
        func = function () {
          return this[callback]();
        };
      }

      if (token) {
        formatTokenFunctions[token] = func;
      }

      if (padded) {
        formatTokenFunctions[padded[0]] = function () {
          return zeroFill(func.apply(this, arguments), padded[1], padded[2]);
        };
      }

      if (ordinal) {
        formatTokenFunctions[ordinal] = function () {
          return this.localeData().ordinal(func.apply(this, arguments), token);
        };
      }
    }

    function removeFormattingTokens(input) {
      if (input.match(/\[[\s\S]/)) {
        return input.replace(/^\[|\]$/g, '');
      }

      return input.replace(/\\/g, '');
    }

    function makeFormatFunction(format) {
      var array = format.match(formattingTokens),
          i,
          length;

      for (i = 0, length = array.length; i < length; i++) {
        if (formatTokenFunctions[array[i]]) {
          array[i] = formatTokenFunctions[array[i]];
        } else {
          array[i] = removeFormattingTokens(array[i]);
        }
      }

      return function (mom) {
        var output = '',
            i;

        for (i = 0; i < length; i++) {
          output += isFunction(array[i]) ? array[i].call(mom, format) : array[i];
        }

        return output;
      };
    } // format date using native date object


    function formatMoment(m, format) {
      if (!m.isValid()) {
        return m.localeData().invalidDate();
      }

      format = expandFormat(format, m.localeData());
      formatFunctions[format] = formatFunctions[format] || makeFormatFunction(format);
      return formatFunctions[format](m);
    }

    function expandFormat(format, locale) {
      var i = 5;

      function replaceLongDateFormatTokens(input) {
        return locale.longDateFormat(input) || input;
      }

      localFormattingTokens.lastIndex = 0;

      while (i >= 0 && localFormattingTokens.test(format)) {
        format = format.replace(localFormattingTokens, replaceLongDateFormatTokens);
        localFormattingTokens.lastIndex = 0;
        i -= 1;
      }

      return format;
    }

    var match1 = /\d/; //       0 - 9

    var match2 = /\d\d/; //      00 - 99

    var match3 = /\d{3}/; //     000 - 999

    var match4 = /\d{4}/; //    0000 - 9999

    var match6 = /[+-]?\d{6}/; // -999999 - 999999

    var match1to2 = /\d\d?/; //       0 - 99

    var match3to4 = /\d\d\d\d?/; //     999 - 9999

    var match5to6 = /\d\d\d\d\d\d?/; //   99999 - 999999

    var match1to3 = /\d{1,3}/; //       0 - 999

    var match1to4 = /\d{1,4}/; //       0 - 9999

    var match1to6 = /[+-]?\d{1,6}/; // -999999 - 999999

    var matchUnsigned = /\d+/; //       0 - inf

    var matchSigned = /[+-]?\d+/; //    -inf - inf

    var matchOffset = /Z|[+-]\d\d:?\d\d/gi; // +00:00 -00:00 +0000 -0000 or Z

    var matchShortOffset = /Z|[+-]\d\d(?::?\d\d)?/gi; // +00 -00 +00:00 -00:00 +0000 -0000 or Z

    var matchTimestamp = /[+-]?\d+(\.\d{1,3})?/; // 123456789 123456789.123
    // any word (or two) characters or numbers including two/three word month in arabic.
    // includes scottish gaelic two word and hyphenated months

    var matchWord = /[0-9]{0,256}['a-z\u00A0-\u05FF\u0700-\uD7FF\uF900-\uFDCF\uFDF0-\uFF07\uFF10-\uFFEF]{1,256}|[\u0600-\u06FF\/]{1,256}(\s*?[\u0600-\u06FF]{1,256}){1,2}/i;
    var regexes = {};

    function addRegexToken(token, regex, strictRegex) {
      regexes[token] = isFunction(regex) ? regex : function (isStrict, localeData) {
        return isStrict && strictRegex ? strictRegex : regex;
      };
    }

    function getParseRegexForToken(token, config) {
      if (!hasOwnProp(regexes, token)) {
        return new RegExp(unescapeFormat(token));
      }

      return regexes[token](config._strict, config._locale);
    } // Code from http://stackoverflow.com/questions/3561493/is-there-a-regexp-escape-function-in-javascript


    function unescapeFormat(s) {
      return regexEscape(s.replace('\\', '').replace(/\\(\[)|\\(\])|\[([^\]\[]*)\]|\\(.)/g, function (matched, p1, p2, p3, p4) {
        return p1 || p2 || p3 || p4;
      }));
    }

    function regexEscape(s) {
      return s.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
    }

    var tokens = {};

    function addParseToken(token, callback) {
      var i,
          func = callback;

      if (typeof token === 'string') {
        token = [token];
      }

      if (isNumber(callback)) {
        func = function (input, array) {
          array[callback] = toInt(input);
        };
      }

      for (i = 0; i < token.length; i++) {
        tokens[token[i]] = func;
      }
    }

    function addWeekParseToken(token, callback) {
      addParseToken(token, function (input, array, config, token) {
        config._w = config._w || {};
        callback(input, config._w, config, token);
      });
    }

    function addTimeToArrayFromToken(token, input, config) {
      if (input != null && hasOwnProp(tokens, token)) {
        tokens[token](input, config._a, config, token);
      }
    }

    var YEAR = 0;
    var MONTH = 1;
    var DATE = 2;
    var HOUR = 3;
    var MINUTE = 4;
    var SECOND = 5;
    var MILLISECOND = 6;
    var WEEK = 7;
    var WEEKDAY = 8; // FORMATTING

    addFormatToken('Y', 0, 0, function () {
      var y = this.year();
      return y <= 9999 ? '' + y : '+' + y;
    });
    addFormatToken(0, ['YY', 2], 0, function () {
      return this.year() % 100;
    });
    addFormatToken(0, ['YYYY', 4], 0, 'year');
    addFormatToken(0, ['YYYYY', 5], 0, 'year');
    addFormatToken(0, ['YYYYYY', 6, true], 0, 'year'); // ALIASES

    addUnitAlias('year', 'y'); // PRIORITIES

    addUnitPriority('year', 1); // PARSING

    addRegexToken('Y', matchSigned);
    addRegexToken('YY', match1to2, match2);
    addRegexToken('YYYY', match1to4, match4);
    addRegexToken('YYYYY', match1to6, match6);
    addRegexToken('YYYYYY', match1to6, match6);
    addParseToken(['YYYYY', 'YYYYYY'], YEAR);
    addParseToken('YYYY', function (input, array) {
      array[YEAR] = input.length === 2 ? hooks.parseTwoDigitYear(input) : toInt(input);
    });
    addParseToken('YY', function (input, array) {
      array[YEAR] = hooks.parseTwoDigitYear(input);
    });
    addParseToken('Y', function (input, array) {
      array[YEAR] = parseInt(input, 10);
    }); // HELPERS

    function daysInYear(year) {
      return isLeapYear(year) ? 366 : 365;
    }

    function isLeapYear(year) {
      return year % 4 === 0 && year % 100 !== 0 || year % 400 === 0;
    } // HOOKS


    hooks.parseTwoDigitYear = function (input) {
      return toInt(input) + (toInt(input) > 68 ? 1900 : 2000);
    }; // MOMENTS


    var getSetYear = makeGetSet('FullYear', true);

    function getIsLeapYear() {
      return isLeapYear(this.year());
    }

    function makeGetSet(unit, keepTime) {
      return function (value) {
        if (value != null) {
          set$1(this, unit, value);
          hooks.updateOffset(this, keepTime);
          return this;
        } else {
          return get(this, unit);
        }
      };
    }

    function get(mom, unit) {
      return mom.isValid() ? mom._d['get' + (mom._isUTC ? 'UTC' : '') + unit]() : NaN;
    }

    function set$1(mom, unit, value) {
      if (mom.isValid() && !isNaN(value)) {
        if (unit === 'FullYear' && isLeapYear(mom.year()) && mom.month() === 1 && mom.date() === 29) {
          mom._d['set' + (mom._isUTC ? 'UTC' : '') + unit](value, mom.month(), daysInMonth(value, mom.month()));
        } else {
          mom._d['set' + (mom._isUTC ? 'UTC' : '') + unit](value);
        }
      }
    } // MOMENTS


    function stringGet(units) {
      units = normalizeUnits(units);

      if (isFunction(this[units])) {
        return this[units]();
      }

      return this;
    }

    function stringSet(units, value) {
      if (typeof units === 'object') {
        units = normalizeObjectUnits(units);
        var prioritized = getPrioritizedUnits(units);

        for (var i = 0; i < prioritized.length; i++) {
          this[prioritized[i].unit](units[prioritized[i].unit]);
        }
      } else {
        units = normalizeUnits(units);

        if (isFunction(this[units])) {
          return this[units](value);
        }
      }

      return this;
    }

    function mod(n, x) {
      return (n % x + x) % x;
    }

    var indexOf;

    if (Array.prototype.indexOf) {
      indexOf = Array.prototype.indexOf;
    } else {
      indexOf = function (o) {
        // I know
        var i;

        for (i = 0; i < this.length; ++i) {
          if (this[i] === o) {
            return i;
          }
        }

        return -1;
      };
    }

    function daysInMonth(year, month) {
      if (isNaN(year) || isNaN(month)) {
        return NaN;
      }

      var modMonth = mod(month, 12);
      year += (month - modMonth) / 12;
      return modMonth === 1 ? isLeapYear(year) ? 29 : 28 : 31 - modMonth % 7 % 2;
    } // FORMATTING


    addFormatToken('M', ['MM', 2], 'Mo', function () {
      return this.month() + 1;
    });
    addFormatToken('MMM', 0, 0, function (format) {
      return this.localeData().monthsShort(this, format);
    });
    addFormatToken('MMMM', 0, 0, function (format) {
      return this.localeData().months(this, format);
    }); // ALIASES

    addUnitAlias('month', 'M'); // PRIORITY

    addUnitPriority('month', 8); // PARSING

    addRegexToken('M', match1to2);
    addRegexToken('MM', match1to2, match2);
    addRegexToken('MMM', function (isStrict, locale) {
      return locale.monthsShortRegex(isStrict);
    });
    addRegexToken('MMMM', function (isStrict, locale) {
      return locale.monthsRegex(isStrict);
    });
    addParseToken(['M', 'MM'], function (input, array) {
      array[MONTH] = toInt(input) - 1;
    });
    addParseToken(['MMM', 'MMMM'], function (input, array, config, token) {
      var month = config._locale.monthsParse(input, token, config._strict); // if we didn't find a month name, mark the date as invalid.


      if (month != null) {
        array[MONTH] = month;
      } else {
        getParsingFlags(config).invalidMonth = input;
      }
    }); // LOCALES

    var MONTHS_IN_FORMAT = /D[oD]?(\[[^\[\]]*\]|\s)+MMMM?/;
    var defaultLocaleMonths = 'January_February_March_April_May_June_July_August_September_October_November_December'.split('_');

    function localeMonths(m, format) {
      if (!m) {
        return isArray(this._months) ? this._months : this._months['standalone'];
      }

      return isArray(this._months) ? this._months[m.month()] : this._months[(this._months.isFormat || MONTHS_IN_FORMAT).test(format) ? 'format' : 'standalone'][m.month()];
    }

    var defaultLocaleMonthsShort = 'Jan_Feb_Mar_Apr_May_Jun_Jul_Aug_Sep_Oct_Nov_Dec'.split('_');

    function localeMonthsShort(m, format) {
      if (!m) {
        return isArray(this._monthsShort) ? this._monthsShort : this._monthsShort['standalone'];
      }

      return isArray(this._monthsShort) ? this._monthsShort[m.month()] : this._monthsShort[MONTHS_IN_FORMAT.test(format) ? 'format' : 'standalone'][m.month()];
    }

    function handleStrictParse(monthName, format, strict) {
      var i,
          ii,
          mom,
          llc = monthName.toLocaleLowerCase();

      if (!this._monthsParse) {
        // this is not used
        this._monthsParse = [];
        this._longMonthsParse = [];
        this._shortMonthsParse = [];

        for (i = 0; i < 12; ++i) {
          mom = createUTC([2000, i]);
          this._shortMonthsParse[i] = this.monthsShort(mom, '').toLocaleLowerCase();
          this._longMonthsParse[i] = this.months(mom, '').toLocaleLowerCase();
        }
      }

      if (strict) {
        if (format === 'MMM') {
          ii = indexOf.call(this._shortMonthsParse, llc);
          return ii !== -1 ? ii : null;
        } else {
          ii = indexOf.call(this._longMonthsParse, llc);
          return ii !== -1 ? ii : null;
        }
      } else {
        if (format === 'MMM') {
          ii = indexOf.call(this._shortMonthsParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._longMonthsParse, llc);
          return ii !== -1 ? ii : null;
        } else {
          ii = indexOf.call(this._longMonthsParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._shortMonthsParse, llc);
          return ii !== -1 ? ii : null;
        }
      }
    }

    function localeMonthsParse(monthName, format, strict) {
      var i, mom, regex;

      if (this._monthsParseExact) {
        return handleStrictParse.call(this, monthName, format, strict);
      }

      if (!this._monthsParse) {
        this._monthsParse = [];
        this._longMonthsParse = [];
        this._shortMonthsParse = [];
      } // TODO: add sorting
      // Sorting makes sure if one month (or abbr) is a prefix of another
      // see sorting in computeMonthsParse


      for (i = 0; i < 12; i++) {
        // make the regex if we don't have it already
        mom = createUTC([2000, i]);

        if (strict && !this._longMonthsParse[i]) {
          this._longMonthsParse[i] = new RegExp('^' + this.months(mom, '').replace('.', '') + '$', 'i');
          this._shortMonthsParse[i] = new RegExp('^' + this.monthsShort(mom, '').replace('.', '') + '$', 'i');
        }

        if (!strict && !this._monthsParse[i]) {
          regex = '^' + this.months(mom, '') + '|^' + this.monthsShort(mom, '');
          this._monthsParse[i] = new RegExp(regex.replace('.', ''), 'i');
        } // test the regex


        if (strict && format === 'MMMM' && this._longMonthsParse[i].test(monthName)) {
          return i;
        } else if (strict && format === 'MMM' && this._shortMonthsParse[i].test(monthName)) {
          return i;
        } else if (!strict && this._monthsParse[i].test(monthName)) {
          return i;
        }
      }
    } // MOMENTS


    function setMonth(mom, value) {
      var dayOfMonth;

      if (!mom.isValid()) {
        // No op
        return mom;
      }

      if (typeof value === 'string') {
        if (/^\d+$/.test(value)) {
          value = toInt(value);
        } else {
          value = mom.localeData().monthsParse(value); // TODO: Another silent failure?

          if (!isNumber(value)) {
            return mom;
          }
        }
      }

      dayOfMonth = Math.min(mom.date(), daysInMonth(mom.year(), value));

      mom._d['set' + (mom._isUTC ? 'UTC' : '') + 'Month'](value, dayOfMonth);

      return mom;
    }

    function getSetMonth(value) {
      if (value != null) {
        setMonth(this, value);
        hooks.updateOffset(this, true);
        return this;
      } else {
        return get(this, 'Month');
      }
    }

    function getDaysInMonth() {
      return daysInMonth(this.year(), this.month());
    }

    var defaultMonthsShortRegex = matchWord;

    function monthsShortRegex(isStrict) {
      if (this._monthsParseExact) {
        if (!hasOwnProp(this, '_monthsRegex')) {
          computeMonthsParse.call(this);
        }

        if (isStrict) {
          return this._monthsShortStrictRegex;
        } else {
          return this._monthsShortRegex;
        }
      } else {
        if (!hasOwnProp(this, '_monthsShortRegex')) {
          this._monthsShortRegex = defaultMonthsShortRegex;
        }

        return this._monthsShortStrictRegex && isStrict ? this._monthsShortStrictRegex : this._monthsShortRegex;
      }
    }

    var defaultMonthsRegex = matchWord;

    function monthsRegex(isStrict) {
      if (this._monthsParseExact) {
        if (!hasOwnProp(this, '_monthsRegex')) {
          computeMonthsParse.call(this);
        }

        if (isStrict) {
          return this._monthsStrictRegex;
        } else {
          return this._monthsRegex;
        }
      } else {
        if (!hasOwnProp(this, '_monthsRegex')) {
          this._monthsRegex = defaultMonthsRegex;
        }

        return this._monthsStrictRegex && isStrict ? this._monthsStrictRegex : this._monthsRegex;
      }
    }

    function computeMonthsParse() {
      function cmpLenRev(a, b) {
        return b.length - a.length;
      }

      var shortPieces = [],
          longPieces = [],
          mixedPieces = [],
          i,
          mom;

      for (i = 0; i < 12; i++) {
        // make the regex if we don't have it already
        mom = createUTC([2000, i]);
        shortPieces.push(this.monthsShort(mom, ''));
        longPieces.push(this.months(mom, ''));
        mixedPieces.push(this.months(mom, ''));
        mixedPieces.push(this.monthsShort(mom, ''));
      } // Sorting makes sure if one month (or abbr) is a prefix of another it
      // will match the longer piece.


      shortPieces.sort(cmpLenRev);
      longPieces.sort(cmpLenRev);
      mixedPieces.sort(cmpLenRev);

      for (i = 0; i < 12; i++) {
        shortPieces[i] = regexEscape(shortPieces[i]);
        longPieces[i] = regexEscape(longPieces[i]);
      }

      for (i = 0; i < 24; i++) {
        mixedPieces[i] = regexEscape(mixedPieces[i]);
      }

      this._monthsRegex = new RegExp('^(' + mixedPieces.join('|') + ')', 'i');
      this._monthsShortRegex = this._monthsRegex;
      this._monthsStrictRegex = new RegExp('^(' + longPieces.join('|') + ')', 'i');
      this._monthsShortStrictRegex = new RegExp('^(' + shortPieces.join('|') + ')', 'i');
    }

    function createDate(y, m, d, h, M, s, ms) {
      // can't just apply() to create a date:
      // https://stackoverflow.com/q/181348
      var date; // the date constructor remaps years 0-99 to 1900-1999

      if (y < 100 && y >= 0) {
        // preserve leap years using a full 400 year cycle, then reset
        date = new Date(y + 400, m, d, h, M, s, ms);

        if (isFinite(date.getFullYear())) {
          date.setFullYear(y);
        }
      } else {
        date = new Date(y, m, d, h, M, s, ms);
      }

      return date;
    }

    function createUTCDate(y) {
      var date; // the Date.UTC function remaps years 0-99 to 1900-1999

      if (y < 100 && y >= 0) {
        var args = Array.prototype.slice.call(arguments); // preserve leap years using a full 400 year cycle, then reset

        args[0] = y + 400;
        date = new Date(Date.UTC.apply(null, args));

        if (isFinite(date.getUTCFullYear())) {
          date.setUTCFullYear(y);
        }
      } else {
        date = new Date(Date.UTC.apply(null, arguments));
      }

      return date;
    } // start-of-first-week - start-of-year


    function firstWeekOffset(year, dow, doy) {
      var // first-week day -- which january is always in the first week (4 for iso, 1 for other)
      fwd = 7 + dow - doy,
          // first-week day local weekday -- which local weekday is fwd
      fwdlw = (7 + createUTCDate(year, 0, fwd).getUTCDay() - dow) % 7;
      return -fwdlw + fwd - 1;
    } // https://en.wikipedia.org/wiki/ISO_week_date#Calculating_a_date_given_the_year.2C_week_number_and_weekday


    function dayOfYearFromWeeks(year, week, weekday, dow, doy) {
      var localWeekday = (7 + weekday - dow) % 7,
          weekOffset = firstWeekOffset(year, dow, doy),
          dayOfYear = 1 + 7 * (week - 1) + localWeekday + weekOffset,
          resYear,
          resDayOfYear;

      if (dayOfYear <= 0) {
        resYear = year - 1;
        resDayOfYear = daysInYear(resYear) + dayOfYear;
      } else if (dayOfYear > daysInYear(year)) {
        resYear = year + 1;
        resDayOfYear = dayOfYear - daysInYear(year);
      } else {
        resYear = year;
        resDayOfYear = dayOfYear;
      }

      return {
        year: resYear,
        dayOfYear: resDayOfYear
      };
    }

    function weekOfYear(mom, dow, doy) {
      var weekOffset = firstWeekOffset(mom.year(), dow, doy),
          week = Math.floor((mom.dayOfYear() - weekOffset - 1) / 7) + 1,
          resWeek,
          resYear;

      if (week < 1) {
        resYear = mom.year() - 1;
        resWeek = week + weeksInYear(resYear, dow, doy);
      } else if (week > weeksInYear(mom.year(), dow, doy)) {
        resWeek = week - weeksInYear(mom.year(), dow, doy);
        resYear = mom.year() + 1;
      } else {
        resYear = mom.year();
        resWeek = week;
      }

      return {
        week: resWeek,
        year: resYear
      };
    }

    function weeksInYear(year, dow, doy) {
      var weekOffset = firstWeekOffset(year, dow, doy),
          weekOffsetNext = firstWeekOffset(year + 1, dow, doy);
      return (daysInYear(year) - weekOffset + weekOffsetNext) / 7;
    } // FORMATTING


    addFormatToken('w', ['ww', 2], 'wo', 'week');
    addFormatToken('W', ['WW', 2], 'Wo', 'isoWeek'); // ALIASES

    addUnitAlias('week', 'w');
    addUnitAlias('isoWeek', 'W'); // PRIORITIES

    addUnitPriority('week', 5);
    addUnitPriority('isoWeek', 5); // PARSING

    addRegexToken('w', match1to2);
    addRegexToken('ww', match1to2, match2);
    addRegexToken('W', match1to2);
    addRegexToken('WW', match1to2, match2);
    addWeekParseToken(['w', 'ww', 'W', 'WW'], function (input, week, config, token) {
      week[token.substr(0, 1)] = toInt(input);
    }); // HELPERS
    // LOCALES

    function localeWeek(mom) {
      return weekOfYear(mom, this._week.dow, this._week.doy).week;
    }

    var defaultLocaleWeek = {
      dow: 0,
      // Sunday is the first day of the week.
      doy: 6 // The week that contains Jan 6th is the first week of the year.

    };

    function localeFirstDayOfWeek() {
      return this._week.dow;
    }

    function localeFirstDayOfYear() {
      return this._week.doy;
    } // MOMENTS


    function getSetWeek(input) {
      var week = this.localeData().week(this);
      return input == null ? week : this.add((input - week) * 7, 'd');
    }

    function getSetISOWeek(input) {
      var week = weekOfYear(this, 1, 4).week;
      return input == null ? week : this.add((input - week) * 7, 'd');
    } // FORMATTING


    addFormatToken('d', 0, 'do', 'day');
    addFormatToken('dd', 0, 0, function (format) {
      return this.localeData().weekdaysMin(this, format);
    });
    addFormatToken('ddd', 0, 0, function (format) {
      return this.localeData().weekdaysShort(this, format);
    });
    addFormatToken('dddd', 0, 0, function (format) {
      return this.localeData().weekdays(this, format);
    });
    addFormatToken('e', 0, 0, 'weekday');
    addFormatToken('E', 0, 0, 'isoWeekday'); // ALIASES

    addUnitAlias('day', 'd');
    addUnitAlias('weekday', 'e');
    addUnitAlias('isoWeekday', 'E'); // PRIORITY

    addUnitPriority('day', 11);
    addUnitPriority('weekday', 11);
    addUnitPriority('isoWeekday', 11); // PARSING

    addRegexToken('d', match1to2);
    addRegexToken('e', match1to2);
    addRegexToken('E', match1to2);
    addRegexToken('dd', function (isStrict, locale) {
      return locale.weekdaysMinRegex(isStrict);
    });
    addRegexToken('ddd', function (isStrict, locale) {
      return locale.weekdaysShortRegex(isStrict);
    });
    addRegexToken('dddd', function (isStrict, locale) {
      return locale.weekdaysRegex(isStrict);
    });
    addWeekParseToken(['dd', 'ddd', 'dddd'], function (input, week, config, token) {
      var weekday = config._locale.weekdaysParse(input, token, config._strict); // if we didn't get a weekday name, mark the date as invalid


      if (weekday != null) {
        week.d = weekday;
      } else {
        getParsingFlags(config).invalidWeekday = input;
      }
    });
    addWeekParseToken(['d', 'e', 'E'], function (input, week, config, token) {
      week[token] = toInt(input);
    }); // HELPERS

    function parseWeekday(input, locale) {
      if (typeof input !== 'string') {
        return input;
      }

      if (!isNaN(input)) {
        return parseInt(input, 10);
      }

      input = locale.weekdaysParse(input);

      if (typeof input === 'number') {
        return input;
      }

      return null;
    }

    function parseIsoWeekday(input, locale) {
      if (typeof input === 'string') {
        return locale.weekdaysParse(input) % 7 || 7;
      }

      return isNaN(input) ? null : input;
    } // LOCALES


    function shiftWeekdays(ws, n) {
      return ws.slice(n, 7).concat(ws.slice(0, n));
    }

    var defaultLocaleWeekdays = 'Sunday_Monday_Tuesday_Wednesday_Thursday_Friday_Saturday'.split('_');

    function localeWeekdays(m, format) {
      var weekdays = isArray(this._weekdays) ? this._weekdays : this._weekdays[m && m !== true && this._weekdays.isFormat.test(format) ? 'format' : 'standalone'];
      return m === true ? shiftWeekdays(weekdays, this._week.dow) : m ? weekdays[m.day()] : weekdays;
    }

    var defaultLocaleWeekdaysShort = 'Sun_Mon_Tue_Wed_Thu_Fri_Sat'.split('_');

    function localeWeekdaysShort(m) {
      return m === true ? shiftWeekdays(this._weekdaysShort, this._week.dow) : m ? this._weekdaysShort[m.day()] : this._weekdaysShort;
    }

    var defaultLocaleWeekdaysMin = 'Su_Mo_Tu_We_Th_Fr_Sa'.split('_');

    function localeWeekdaysMin(m) {
      return m === true ? shiftWeekdays(this._weekdaysMin, this._week.dow) : m ? this._weekdaysMin[m.day()] : this._weekdaysMin;
    }

    function handleStrictParse$1(weekdayName, format, strict) {
      var i,
          ii,
          mom,
          llc = weekdayName.toLocaleLowerCase();

      if (!this._weekdaysParse) {
        this._weekdaysParse = [];
        this._shortWeekdaysParse = [];
        this._minWeekdaysParse = [];

        for (i = 0; i < 7; ++i) {
          mom = createUTC([2000, 1]).day(i);
          this._minWeekdaysParse[i] = this.weekdaysMin(mom, '').toLocaleLowerCase();
          this._shortWeekdaysParse[i] = this.weekdaysShort(mom, '').toLocaleLowerCase();
          this._weekdaysParse[i] = this.weekdays(mom, '').toLocaleLowerCase();
        }
      }

      if (strict) {
        if (format === 'dddd') {
          ii = indexOf.call(this._weekdaysParse, llc);
          return ii !== -1 ? ii : null;
        } else if (format === 'ddd') {
          ii = indexOf.call(this._shortWeekdaysParse, llc);
          return ii !== -1 ? ii : null;
        } else {
          ii = indexOf.call(this._minWeekdaysParse, llc);
          return ii !== -1 ? ii : null;
        }
      } else {
        if (format === 'dddd') {
          ii = indexOf.call(this._weekdaysParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._shortWeekdaysParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._minWeekdaysParse, llc);
          return ii !== -1 ? ii : null;
        } else if (format === 'ddd') {
          ii = indexOf.call(this._shortWeekdaysParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._weekdaysParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._minWeekdaysParse, llc);
          return ii !== -1 ? ii : null;
        } else {
          ii = indexOf.call(this._minWeekdaysParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._weekdaysParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._shortWeekdaysParse, llc);
          return ii !== -1 ? ii : null;
        }
      }
    }

    function localeWeekdaysParse(weekdayName, format, strict) {
      var i, mom, regex;

      if (this._weekdaysParseExact) {
        return handleStrictParse$1.call(this, weekdayName, format, strict);
      }

      if (!this._weekdaysParse) {
        this._weekdaysParse = [];
        this._minWeekdaysParse = [];
        this._shortWeekdaysParse = [];
        this._fullWeekdaysParse = [];
      }

      for (i = 0; i < 7; i++) {
        // make the regex if we don't have it already
        mom = createUTC([2000, 1]).day(i);

        if (strict && !this._fullWeekdaysParse[i]) {
          this._fullWeekdaysParse[i] = new RegExp('^' + this.weekdays(mom, '').replace('.', '\\.?') + '$', 'i');
          this._shortWeekdaysParse[i] = new RegExp('^' + this.weekdaysShort(mom, '').replace('.', '\\.?') + '$', 'i');
          this._minWeekdaysParse[i] = new RegExp('^' + this.weekdaysMin(mom, '').replace('.', '\\.?') + '$', 'i');
        }

        if (!this._weekdaysParse[i]) {
          regex = '^' + this.weekdays(mom, '') + '|^' + this.weekdaysShort(mom, '') + '|^' + this.weekdaysMin(mom, '');
          this._weekdaysParse[i] = new RegExp(regex.replace('.', ''), 'i');
        } // test the regex


        if (strict && format === 'dddd' && this._fullWeekdaysParse[i].test(weekdayName)) {
          return i;
        } else if (strict && format === 'ddd' && this._shortWeekdaysParse[i].test(weekdayName)) {
          return i;
        } else if (strict && format === 'dd' && this._minWeekdaysParse[i].test(weekdayName)) {
          return i;
        } else if (!strict && this._weekdaysParse[i].test(weekdayName)) {
          return i;
        }
      }
    } // MOMENTS


    function getSetDayOfWeek(input) {
      if (!this.isValid()) {
        return input != null ? this : NaN;
      }

      var day = this._isUTC ? this._d.getUTCDay() : this._d.getDay();

      if (input != null) {
        input = parseWeekday(input, this.localeData());
        return this.add(input - day, 'd');
      } else {
        return day;
      }
    }

    function getSetLocaleDayOfWeek(input) {
      if (!this.isValid()) {
        return input != null ? this : NaN;
      }

      var weekday = (this.day() + 7 - this.localeData()._week.dow) % 7;
      return input == null ? weekday : this.add(input - weekday, 'd');
    }

    function getSetISODayOfWeek(input) {
      if (!this.isValid()) {
        return input != null ? this : NaN;
      } // behaves the same as moment#day except
      // as a getter, returns 7 instead of 0 (1-7 range instead of 0-6)
      // as a setter, sunday should belong to the previous week.


      if (input != null) {
        var weekday = parseIsoWeekday(input, this.localeData());
        return this.day(this.day() % 7 ? weekday : weekday - 7);
      } else {
        return this.day() || 7;
      }
    }

    var defaultWeekdaysRegex = matchWord;

    function weekdaysRegex(isStrict) {
      if (this._weekdaysParseExact) {
        if (!hasOwnProp(this, '_weekdaysRegex')) {
          computeWeekdaysParse.call(this);
        }

        if (isStrict) {
          return this._weekdaysStrictRegex;
        } else {
          return this._weekdaysRegex;
        }
      } else {
        if (!hasOwnProp(this, '_weekdaysRegex')) {
          this._weekdaysRegex = defaultWeekdaysRegex;
        }

        return this._weekdaysStrictRegex && isStrict ? this._weekdaysStrictRegex : this._weekdaysRegex;
      }
    }

    var defaultWeekdaysShortRegex = matchWord;

    function weekdaysShortRegex(isStrict) {
      if (this._weekdaysParseExact) {
        if (!hasOwnProp(this, '_weekdaysRegex')) {
          computeWeekdaysParse.call(this);
        }

        if (isStrict) {
          return this._weekdaysShortStrictRegex;
        } else {
          return this._weekdaysShortRegex;
        }
      } else {
        if (!hasOwnProp(this, '_weekdaysShortRegex')) {
          this._weekdaysShortRegex = defaultWeekdaysShortRegex;
        }

        return this._weekdaysShortStrictRegex && isStrict ? this._weekdaysShortStrictRegex : this._weekdaysShortRegex;
      }
    }

    var defaultWeekdaysMinRegex = matchWord;

    function weekdaysMinRegex(isStrict) {
      if (this._weekdaysParseExact) {
        if (!hasOwnProp(this, '_weekdaysRegex')) {
          computeWeekdaysParse.call(this);
        }

        if (isStrict) {
          return this._weekdaysMinStrictRegex;
        } else {
          return this._weekdaysMinRegex;
        }
      } else {
        if (!hasOwnProp(this, '_weekdaysMinRegex')) {
          this._weekdaysMinRegex = defaultWeekdaysMinRegex;
        }

        return this._weekdaysMinStrictRegex && isStrict ? this._weekdaysMinStrictRegex : this._weekdaysMinRegex;
      }
    }

    function computeWeekdaysParse() {
      function cmpLenRev(a, b) {
        return b.length - a.length;
      }

      var minPieces = [],
          shortPieces = [],
          longPieces = [],
          mixedPieces = [],
          i,
          mom,
          minp,
          shortp,
          longp;

      for (i = 0; i < 7; i++) {
        // make the regex if we don't have it already
        mom = createUTC([2000, 1]).day(i);
        minp = this.weekdaysMin(mom, '');
        shortp = this.weekdaysShort(mom, '');
        longp = this.weekdays(mom, '');
        minPieces.push(minp);
        shortPieces.push(shortp);
        longPieces.push(longp);
        mixedPieces.push(minp);
        mixedPieces.push(shortp);
        mixedPieces.push(longp);
      } // Sorting makes sure if one weekday (or abbr) is a prefix of another it
      // will match the longer piece.


      minPieces.sort(cmpLenRev);
      shortPieces.sort(cmpLenRev);
      longPieces.sort(cmpLenRev);
      mixedPieces.sort(cmpLenRev);

      for (i = 0; i < 7; i++) {
        shortPieces[i] = regexEscape(shortPieces[i]);
        longPieces[i] = regexEscape(longPieces[i]);
        mixedPieces[i] = regexEscape(mixedPieces[i]);
      }

      this._weekdaysRegex = new RegExp('^(' + mixedPieces.join('|') + ')', 'i');
      this._weekdaysShortRegex = this._weekdaysRegex;
      this._weekdaysMinRegex = this._weekdaysRegex;
      this._weekdaysStrictRegex = new RegExp('^(' + longPieces.join('|') + ')', 'i');
      this._weekdaysShortStrictRegex = new RegExp('^(' + shortPieces.join('|') + ')', 'i');
      this._weekdaysMinStrictRegex = new RegExp('^(' + minPieces.join('|') + ')', 'i');
    } // FORMATTING


    function hFormat() {
      return this.hours() % 12 || 12;
    }

    function kFormat() {
      return this.hours() || 24;
    }

    addFormatToken('H', ['HH', 2], 0, 'hour');
    addFormatToken('h', ['hh', 2], 0, hFormat);
    addFormatToken('k', ['kk', 2], 0, kFormat);
    addFormatToken('hmm', 0, 0, function () {
      return '' + hFormat.apply(this) + zeroFill(this.minutes(), 2);
    });
    addFormatToken('hmmss', 0, 0, function () {
      return '' + hFormat.apply(this) + zeroFill(this.minutes(), 2) + zeroFill(this.seconds(), 2);
    });
    addFormatToken('Hmm', 0, 0, function () {
      return '' + this.hours() + zeroFill(this.minutes(), 2);
    });
    addFormatToken('Hmmss', 0, 0, function () {
      return '' + this.hours() + zeroFill(this.minutes(), 2) + zeroFill(this.seconds(), 2);
    });

    function meridiem(token, lowercase) {
      addFormatToken(token, 0, 0, function () {
        return this.localeData().meridiem(this.hours(), this.minutes(), lowercase);
      });
    }

    meridiem('a', true);
    meridiem('A', false); // ALIASES

    addUnitAlias('hour', 'h'); // PRIORITY

    addUnitPriority('hour', 13); // PARSING

    function matchMeridiem(isStrict, locale) {
      return locale._meridiemParse;
    }

    addRegexToken('a', matchMeridiem);
    addRegexToken('A', matchMeridiem);
    addRegexToken('H', match1to2);
    addRegexToken('h', match1to2);
    addRegexToken('k', match1to2);
    addRegexToken('HH', match1to2, match2);
    addRegexToken('hh', match1to2, match2);
    addRegexToken('kk', match1to2, match2);
    addRegexToken('hmm', match3to4);
    addRegexToken('hmmss', match5to6);
    addRegexToken('Hmm', match3to4);
    addRegexToken('Hmmss', match5to6);
    addParseToken(['H', 'HH'], HOUR);
    addParseToken(['k', 'kk'], function (input, array, config) {
      var kInput = toInt(input);
      array[HOUR] = kInput === 24 ? 0 : kInput;
    });
    addParseToken(['a', 'A'], function (input, array, config) {
      config._isPm = config._locale.isPM(input);
      config._meridiem = input;
    });
    addParseToken(['h', 'hh'], function (input, array, config) {
      array[HOUR] = toInt(input);
      getParsingFlags(config).bigHour = true;
    });
    addParseToken('hmm', function (input, array, config) {
      var pos = input.length - 2;
      array[HOUR] = toInt(input.substr(0, pos));
      array[MINUTE] = toInt(input.substr(pos));
      getParsingFlags(config).bigHour = true;
    });
    addParseToken('hmmss', function (input, array, config) {
      var pos1 = input.length - 4;
      var pos2 = input.length - 2;
      array[HOUR] = toInt(input.substr(0, pos1));
      array[MINUTE] = toInt(input.substr(pos1, 2));
      array[SECOND] = toInt(input.substr(pos2));
      getParsingFlags(config).bigHour = true;
    });
    addParseToken('Hmm', function (input, array, config) {
      var pos = input.length - 2;
      array[HOUR] = toInt(input.substr(0, pos));
      array[MINUTE] = toInt(input.substr(pos));
    });
    addParseToken('Hmmss', function (input, array, config) {
      var pos1 = input.length - 4;
      var pos2 = input.length - 2;
      array[HOUR] = toInt(input.substr(0, pos1));
      array[MINUTE] = toInt(input.substr(pos1, 2));
      array[SECOND] = toInt(input.substr(pos2));
    }); // LOCALES

    function localeIsPM(input) {
      // IE8 Quirks Mode & IE7 Standards Mode do not allow accessing strings like arrays
      // Using charAt should be more compatible.
      return (input + '').toLowerCase().charAt(0) === 'p';
    }

    var defaultLocaleMeridiemParse = /[ap]\.?m?\.?/i;

    function localeMeridiem(hours, minutes, isLower) {
      if (hours > 11) {
        return isLower ? 'pm' : 'PM';
      } else {
        return isLower ? 'am' : 'AM';
      }
    } // MOMENTS
    // Setting the hour should keep the time, because the user explicitly
    // specified which hour they want. So trying to maintain the same hour (in
    // a new timezone) makes sense. Adding/subtracting hours does not follow
    // this rule.


    var getSetHour = makeGetSet('Hours', true);
    var baseConfig = {
      calendar: defaultCalendar,
      longDateFormat: defaultLongDateFormat,
      invalidDate: defaultInvalidDate,
      ordinal: defaultOrdinal,
      dayOfMonthOrdinalParse: defaultDayOfMonthOrdinalParse,
      relativeTime: defaultRelativeTime,
      months: defaultLocaleMonths,
      monthsShort: defaultLocaleMonthsShort,
      week: defaultLocaleWeek,
      weekdays: defaultLocaleWeekdays,
      weekdaysMin: defaultLocaleWeekdaysMin,
      weekdaysShort: defaultLocaleWeekdaysShort,
      meridiemParse: defaultLocaleMeridiemParse
    }; // internal storage for locale config files

    var locales = {};
    var localeFamilies = {};
    var globalLocale;

    function normalizeLocale(key) {
      return key ? key.toLowerCase().replace('_', '-') : key;
    } // pick the locale from the array
    // try ['en-au', 'en-gb'] as 'en-au', 'en-gb', 'en', as in move through the list trying each
    // substring from most specific to least, but move to the next array item if it's a more specific variant than the current root


    function chooseLocale(names) {
      var i = 0,
          j,
          next,
          locale,
          split;

      while (i < names.length) {
        split = normalizeLocale(names[i]).split('-');
        j = split.length;
        next = normalizeLocale(names[i + 1]);
        next = next ? next.split('-') : null;

        while (j > 0) {
          locale = loadLocale(split.slice(0, j).join('-'));

          if (locale) {
            return locale;
          }

          if (next && next.length >= j && compareArrays(split, next, true) >= j - 1) {
            //the next array item is better than a shallower substring of this one
            break;
          }

          j--;
        }

        i++;
      }

      return globalLocale;
    }

    function loadLocale(name) {
      var oldLocale = null; // TODO: Find a better way to register and load all the locales in Node

      if (!locales[name] && 'object' !== 'undefined' && module && module.exports) {
        try {
          oldLocale = globalLocale._abbr;
          var aliasedRequire = commonjsRequire$2;
          aliasedRequire('./locale/' + name);
          getSetGlobalLocale(oldLocale);
        } catch (e) {}
      }

      return locales[name];
    } // This function will load locale and then set the global locale.  If
    // no arguments are passed in, it will simply return the current global
    // locale key.


    function getSetGlobalLocale(key, values) {
      var data;

      if (key) {
        if (isUndefined(values)) {
          data = getLocale(key);
        } else {
          data = defineLocale(key, values);
        }

        if (data) {
          // moment.duration._locale = moment._locale = data;
          globalLocale = data;
        } else {
          if (typeof console !== 'undefined' && console.warn) {
            //warn user if arguments are passed but the locale could not be set
            console.warn('Locale ' + key + ' not found. Did you forget to load it?');
          }
        }
      }

      return globalLocale._abbr;
    }

    function defineLocale(name, config) {
      if (config !== null) {
        var locale,
            parentConfig = baseConfig;
        config.abbr = name;

        if (locales[name] != null) {
          deprecateSimple('defineLocaleOverride', 'use moment.updateLocale(localeName, config) to change ' + 'an existing locale. moment.defineLocale(localeName, ' + 'config) should only be used for creating a new locale ' + 'See http://momentjs.com/guides/#/warnings/define-locale/ for more info.');
          parentConfig = locales[name]._config;
        } else if (config.parentLocale != null) {
          if (locales[config.parentLocale] != null) {
            parentConfig = locales[config.parentLocale]._config;
          } else {
            locale = loadLocale(config.parentLocale);

            if (locale != null) {
              parentConfig = locale._config;
            } else {
              if (!localeFamilies[config.parentLocale]) {
                localeFamilies[config.parentLocale] = [];
              }

              localeFamilies[config.parentLocale].push({
                name: name,
                config: config
              });
              return null;
            }
          }
        }

        locales[name] = new Locale(mergeConfigs(parentConfig, config));

        if (localeFamilies[name]) {
          localeFamilies[name].forEach(function (x) {
            defineLocale(x.name, x.config);
          });
        } // backwards compat for now: also set the locale
        // make sure we set the locale AFTER all child locales have been
        // created, so we won't end up with the child locale set.


        getSetGlobalLocale(name);
        return locales[name];
      } else {
        // useful for testing
        delete locales[name];
        return null;
      }
    }

    function updateLocale(name, config) {
      if (config != null) {
        var locale,
            tmpLocale,
            parentConfig = baseConfig; // MERGE

        tmpLocale = loadLocale(name);

        if (tmpLocale != null) {
          parentConfig = tmpLocale._config;
        }

        config = mergeConfigs(parentConfig, config);
        locale = new Locale(config);
        locale.parentLocale = locales[name];
        locales[name] = locale; // backwards compat for now: also set the locale

        getSetGlobalLocale(name);
      } else {
        // pass null for config to unupdate, useful for tests
        if (locales[name] != null) {
          if (locales[name].parentLocale != null) {
            locales[name] = locales[name].parentLocale;
          } else if (locales[name] != null) {
            delete locales[name];
          }
        }
      }

      return locales[name];
    } // returns locale data


    function getLocale(key) {
      var locale;

      if (key && key._locale && key._locale._abbr) {
        key = key._locale._abbr;
      }

      if (!key) {
        return globalLocale;
      }

      if (!isArray(key)) {
        //short-circuit everything else
        locale = loadLocale(key);

        if (locale) {
          return locale;
        }

        key = [key];
      }

      return chooseLocale(key);
    }

    function listLocales() {
      return keys(locales);
    }

    function checkOverflow(m) {
      var overflow;
      var a = m._a;

      if (a && getParsingFlags(m).overflow === -2) {
        overflow = a[MONTH] < 0 || a[MONTH] > 11 ? MONTH : a[DATE] < 1 || a[DATE] > daysInMonth(a[YEAR], a[MONTH]) ? DATE : a[HOUR] < 0 || a[HOUR] > 24 || a[HOUR] === 24 && (a[MINUTE] !== 0 || a[SECOND] !== 0 || a[MILLISECOND] !== 0) ? HOUR : a[MINUTE] < 0 || a[MINUTE] > 59 ? MINUTE : a[SECOND] < 0 || a[SECOND] > 59 ? SECOND : a[MILLISECOND] < 0 || a[MILLISECOND] > 999 ? MILLISECOND : -1;

        if (getParsingFlags(m)._overflowDayOfYear && (overflow < YEAR || overflow > DATE)) {
          overflow = DATE;
        }

        if (getParsingFlags(m)._overflowWeeks && overflow === -1) {
          overflow = WEEK;
        }

        if (getParsingFlags(m)._overflowWeekday && overflow === -1) {
          overflow = WEEKDAY;
        }

        getParsingFlags(m).overflow = overflow;
      }

      return m;
    } // Pick the first defined of two or three arguments.


    function defaults(a, b, c) {
      if (a != null) {
        return a;
      }

      if (b != null) {
        return b;
      }

      return c;
    }

    function currentDateArray(config) {
      // hooks is actually the exported moment object
      var nowValue = new Date(hooks.now());

      if (config._useUTC) {
        return [nowValue.getUTCFullYear(), nowValue.getUTCMonth(), nowValue.getUTCDate()];
      }

      return [nowValue.getFullYear(), nowValue.getMonth(), nowValue.getDate()];
    } // convert an array to a date.
    // the array should mirror the parameters below
    // note: all values past the year are optional and will default to the lowest possible value.
    // [year, month, day , hour, minute, second, millisecond]


    function configFromArray(config) {
      var i,
          date,
          input = [],
          currentDate,
          expectedWeekday,
          yearToUse;

      if (config._d) {
        return;
      }

      currentDate = currentDateArray(config); //compute day of the year from weeks and weekdays

      if (config._w && config._a[DATE] == null && config._a[MONTH] == null) {
        dayOfYearFromWeekInfo(config);
      } //if the day of the year is set, figure out what it is


      if (config._dayOfYear != null) {
        yearToUse = defaults(config._a[YEAR], currentDate[YEAR]);

        if (config._dayOfYear > daysInYear(yearToUse) || config._dayOfYear === 0) {
          getParsingFlags(config)._overflowDayOfYear = true;
        }

        date = createUTCDate(yearToUse, 0, config._dayOfYear);
        config._a[MONTH] = date.getUTCMonth();
        config._a[DATE] = date.getUTCDate();
      } // Default to current date.
      // * if no year, month, day of month are given, default to today
      // * if day of month is given, default month and year
      // * if month is given, default only year
      // * if year is given, don't default anything


      for (i = 0; i < 3 && config._a[i] == null; ++i) {
        config._a[i] = input[i] = currentDate[i];
      } // Zero out whatever was not defaulted, including time


      for (; i < 7; i++) {
        config._a[i] = input[i] = config._a[i] == null ? i === 2 ? 1 : 0 : config._a[i];
      } // Check for 24:00:00.000


      if (config._a[HOUR] === 24 && config._a[MINUTE] === 0 && config._a[SECOND] === 0 && config._a[MILLISECOND] === 0) {
        config._nextDay = true;
        config._a[HOUR] = 0;
      }

      config._d = (config._useUTC ? createUTCDate : createDate).apply(null, input);
      expectedWeekday = config._useUTC ? config._d.getUTCDay() : config._d.getDay(); // Apply timezone offset from input. The actual utcOffset can be changed
      // with parseZone.

      if (config._tzm != null) {
        config._d.setUTCMinutes(config._d.getUTCMinutes() - config._tzm);
      }

      if (config._nextDay) {
        config._a[HOUR] = 24;
      } // check for mismatching day of week


      if (config._w && typeof config._w.d !== 'undefined' && config._w.d !== expectedWeekday) {
        getParsingFlags(config).weekdayMismatch = true;
      }
    }

    function dayOfYearFromWeekInfo(config) {
      var w, weekYear, week, weekday, dow, doy, temp, weekdayOverflow;
      w = config._w;

      if (w.GG != null || w.W != null || w.E != null) {
        dow = 1;
        doy = 4; // TODO: We need to take the current isoWeekYear, but that depends on
        // how we interpret now (local, utc, fixed offset). So create
        // a now version of current config (take local/utc/offset flags, and
        // create now).

        weekYear = defaults(w.GG, config._a[YEAR], weekOfYear(createLocal(), 1, 4).year);
        week = defaults(w.W, 1);
        weekday = defaults(w.E, 1);

        if (weekday < 1 || weekday > 7) {
          weekdayOverflow = true;
        }
      } else {
        dow = config._locale._week.dow;
        doy = config._locale._week.doy;
        var curWeek = weekOfYear(createLocal(), dow, doy);
        weekYear = defaults(w.gg, config._a[YEAR], curWeek.year); // Default to current week.

        week = defaults(w.w, curWeek.week);

        if (w.d != null) {
          // weekday -- low day numbers are considered next week
          weekday = w.d;

          if (weekday < 0 || weekday > 6) {
            weekdayOverflow = true;
          }
        } else if (w.e != null) {
          // local weekday -- counting starts from beginning of week
          weekday = w.e + dow;

          if (w.e < 0 || w.e > 6) {
            weekdayOverflow = true;
          }
        } else {
          // default to beginning of week
          weekday = dow;
        }
      }

      if (week < 1 || week > weeksInYear(weekYear, dow, doy)) {
        getParsingFlags(config)._overflowWeeks = true;
      } else if (weekdayOverflow != null) {
        getParsingFlags(config)._overflowWeekday = true;
      } else {
        temp = dayOfYearFromWeeks(weekYear, week, weekday, dow, doy);
        config._a[YEAR] = temp.year;
        config._dayOfYear = temp.dayOfYear;
      }
    } // iso 8601 regex
    // 0000-00-00 0000-W00 or 0000-W00-0 + T + 00 or 00:00 or 00:00:00 or 00:00:00.000 + +00:00 or +0000 or +00)


    var extendedIsoRegex = /^\s*((?:[+-]\d{6}|\d{4})-(?:\d\d-\d\d|W\d\d-\d|W\d\d|\d\d\d|\d\d))(?:(T| )(\d\d(?::\d\d(?::\d\d(?:[.,]\d+)?)?)?)([\+\-]\d\d(?::?\d\d)?|\s*Z)?)?$/;
    var basicIsoRegex = /^\s*((?:[+-]\d{6}|\d{4})(?:\d\d\d\d|W\d\d\d|W\d\d|\d\d\d|\d\d))(?:(T| )(\d\d(?:\d\d(?:\d\d(?:[.,]\d+)?)?)?)([\+\-]\d\d(?::?\d\d)?|\s*Z)?)?$/;
    var tzRegex = /Z|[+-]\d\d(?::?\d\d)?/;
    var isoDates = [['YYYYYY-MM-DD', /[+-]\d{6}-\d\d-\d\d/], ['YYYY-MM-DD', /\d{4}-\d\d-\d\d/], ['GGGG-[W]WW-E', /\d{4}-W\d\d-\d/], ['GGGG-[W]WW', /\d{4}-W\d\d/, false], ['YYYY-DDD', /\d{4}-\d{3}/], ['YYYY-MM', /\d{4}-\d\d/, false], ['YYYYYYMMDD', /[+-]\d{10}/], ['YYYYMMDD', /\d{8}/], // YYYYMM is NOT allowed by the standard
    ['GGGG[W]WWE', /\d{4}W\d{3}/], ['GGGG[W]WW', /\d{4}W\d{2}/, false], ['YYYYDDD', /\d{7}/]]; // iso time formats and regexes

    var isoTimes = [['HH:mm:ss.SSSS', /\d\d:\d\d:\d\d\.\d+/], ['HH:mm:ss,SSSS', /\d\d:\d\d:\d\d,\d+/], ['HH:mm:ss', /\d\d:\d\d:\d\d/], ['HH:mm', /\d\d:\d\d/], ['HHmmss.SSSS', /\d\d\d\d\d\d\.\d+/], ['HHmmss,SSSS', /\d\d\d\d\d\d,\d+/], ['HHmmss', /\d\d\d\d\d\d/], ['HHmm', /\d\d\d\d/], ['HH', /\d\d/]];
    var aspNetJsonRegex = /^\/?Date\((\-?\d+)/i; // date from iso format

    function configFromISO(config) {
      var i,
          l,
          string = config._i,
          match = extendedIsoRegex.exec(string) || basicIsoRegex.exec(string),
          allowTime,
          dateFormat,
          timeFormat,
          tzFormat;

      if (match) {
        getParsingFlags(config).iso = true;

        for (i = 0, l = isoDates.length; i < l; i++) {
          if (isoDates[i][1].exec(match[1])) {
            dateFormat = isoDates[i][0];
            allowTime = isoDates[i][2] !== false;
            break;
          }
        }

        if (dateFormat == null) {
          config._isValid = false;
          return;
        }

        if (match[3]) {
          for (i = 0, l = isoTimes.length; i < l; i++) {
            if (isoTimes[i][1].exec(match[3])) {
              // match[2] should be 'T' or space
              timeFormat = (match[2] || ' ') + isoTimes[i][0];
              break;
            }
          }

          if (timeFormat == null) {
            config._isValid = false;
            return;
          }
        }

        if (!allowTime && timeFormat != null) {
          config._isValid = false;
          return;
        }

        if (match[4]) {
          if (tzRegex.exec(match[4])) {
            tzFormat = 'Z';
          } else {
            config._isValid = false;
            return;
          }
        }

        config._f = dateFormat + (timeFormat || '') + (tzFormat || '');
        configFromStringAndFormat(config);
      } else {
        config._isValid = false;
      }
    } // RFC 2822 regex: For details see https://tools.ietf.org/html/rfc2822#section-3.3


    var rfc2822 = /^(?:(Mon|Tue|Wed|Thu|Fri|Sat|Sun),?\s)?(\d{1,2})\s(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s(\d{2,4})\s(\d\d):(\d\d)(?::(\d\d))?\s(?:(UT|GMT|[ECMP][SD]T)|([Zz])|([+-]\d{4}))$/;

    function extractFromRFC2822Strings(yearStr, monthStr, dayStr, hourStr, minuteStr, secondStr) {
      var result = [untruncateYear(yearStr), defaultLocaleMonthsShort.indexOf(monthStr), parseInt(dayStr, 10), parseInt(hourStr, 10), parseInt(minuteStr, 10)];

      if (secondStr) {
        result.push(parseInt(secondStr, 10));
      }

      return result;
    }

    function untruncateYear(yearStr) {
      var year = parseInt(yearStr, 10);

      if (year <= 49) {
        return 2000 + year;
      } else if (year <= 999) {
        return 1900 + year;
      }

      return year;
    }

    function preprocessRFC2822(s) {
      // Remove comments and folding whitespace and replace multiple-spaces with a single space
      return s.replace(/\([^)]*\)|[\n\t]/g, ' ').replace(/(\s\s+)/g, ' ').replace(/^\s\s*/, '').replace(/\s\s*$/, '');
    }

    function checkWeekday(weekdayStr, parsedInput, config) {
      if (weekdayStr) {
        // TODO: Replace the vanilla JS Date object with an indepentent day-of-week check.
        var weekdayProvided = defaultLocaleWeekdaysShort.indexOf(weekdayStr),
            weekdayActual = new Date(parsedInput[0], parsedInput[1], parsedInput[2]).getDay();

        if (weekdayProvided !== weekdayActual) {
          getParsingFlags(config).weekdayMismatch = true;
          config._isValid = false;
          return false;
        }
      }

      return true;
    }

    var obsOffsets = {
      UT: 0,
      GMT: 0,
      EDT: -4 * 60,
      EST: -5 * 60,
      CDT: -5 * 60,
      CST: -6 * 60,
      MDT: -6 * 60,
      MST: -7 * 60,
      PDT: -7 * 60,
      PST: -8 * 60
    };

    function calculateOffset(obsOffset, militaryOffset, numOffset) {
      if (obsOffset) {
        return obsOffsets[obsOffset];
      } else if (militaryOffset) {
        // the only allowed military tz is Z
        return 0;
      } else {
        var hm = parseInt(numOffset, 10);
        var m = hm % 100,
            h = (hm - m) / 100;
        return h * 60 + m;
      }
    } // date and time from ref 2822 format


    function configFromRFC2822(config) {
      var match = rfc2822.exec(preprocessRFC2822(config._i));

      if (match) {
        var parsedArray = extractFromRFC2822Strings(match[4], match[3], match[2], match[5], match[6], match[7]);

        if (!checkWeekday(match[1], parsedArray, config)) {
          return;
        }

        config._a = parsedArray;
        config._tzm = calculateOffset(match[8], match[9], match[10]);
        config._d = createUTCDate.apply(null, config._a);

        config._d.setUTCMinutes(config._d.getUTCMinutes() - config._tzm);

        getParsingFlags(config).rfc2822 = true;
      } else {
        config._isValid = false;
      }
    } // date from iso format or fallback


    function configFromString(config) {
      var matched = aspNetJsonRegex.exec(config._i);

      if (matched !== null) {
        config._d = new Date(+matched[1]);
        return;
      }

      configFromISO(config);

      if (config._isValid === false) {
        delete config._isValid;
      } else {
        return;
      }

      configFromRFC2822(config);

      if (config._isValid === false) {
        delete config._isValid;
      } else {
        return;
      } // Final attempt, use Input Fallback


      hooks.createFromInputFallback(config);
    }

    hooks.createFromInputFallback = deprecate('value provided is not in a recognized RFC2822 or ISO format. moment construction falls back to js Date(), ' + 'which is not reliable across all browsers and versions. Non RFC2822/ISO date formats are ' + 'discouraged and will be removed in an upcoming major release. Please refer to ' + 'http://momentjs.com/guides/#/warnings/js-date/ for more info.', function (config) {
      config._d = new Date(config._i + (config._useUTC ? ' UTC' : ''));
    }); // constant that refers to the ISO standard

    hooks.ISO_8601 = function () {}; // constant that refers to the RFC 2822 form


    hooks.RFC_2822 = function () {}; // date from string and format string


    function configFromStringAndFormat(config) {
      // TODO: Move this to another part of the creation flow to prevent circular deps
      if (config._f === hooks.ISO_8601) {
        configFromISO(config);
        return;
      }

      if (config._f === hooks.RFC_2822) {
        configFromRFC2822(config);
        return;
      }

      config._a = [];
      getParsingFlags(config).empty = true; // This array is used to make a Date, either with `new Date` or `Date.UTC`

      var string = '' + config._i,
          i,
          parsedInput,
          tokens,
          token,
          skipped,
          stringLength = string.length,
          totalParsedInputLength = 0;
      tokens = expandFormat(config._f, config._locale).match(formattingTokens) || [];

      for (i = 0; i < tokens.length; i++) {
        token = tokens[i];
        parsedInput = (string.match(getParseRegexForToken(token, config)) || [])[0]; // console.log('token', token, 'parsedInput', parsedInput,
        //         'regex', getParseRegexForToken(token, config));

        if (parsedInput) {
          skipped = string.substr(0, string.indexOf(parsedInput));

          if (skipped.length > 0) {
            getParsingFlags(config).unusedInput.push(skipped);
          }

          string = string.slice(string.indexOf(parsedInput) + parsedInput.length);
          totalParsedInputLength += parsedInput.length;
        } // don't parse if it's not a known token


        if (formatTokenFunctions[token]) {
          if (parsedInput) {
            getParsingFlags(config).empty = false;
          } else {
            getParsingFlags(config).unusedTokens.push(token);
          }

          addTimeToArrayFromToken(token, parsedInput, config);
        } else if (config._strict && !parsedInput) {
          getParsingFlags(config).unusedTokens.push(token);
        }
      } // add remaining unparsed input length to the string


      getParsingFlags(config).charsLeftOver = stringLength - totalParsedInputLength;

      if (string.length > 0) {
        getParsingFlags(config).unusedInput.push(string);
      } // clear _12h flag if hour is <= 12


      if (config._a[HOUR] <= 12 && getParsingFlags(config).bigHour === true && config._a[HOUR] > 0) {
        getParsingFlags(config).bigHour = undefined;
      }

      getParsingFlags(config).parsedDateParts = config._a.slice(0);
      getParsingFlags(config).meridiem = config._meridiem; // handle meridiem

      config._a[HOUR] = meridiemFixWrap(config._locale, config._a[HOUR], config._meridiem);
      configFromArray(config);
      checkOverflow(config);
    }

    function meridiemFixWrap(locale, hour, meridiem) {
      var isPm;

      if (meridiem == null) {
        // nothing to do
        return hour;
      }

      if (locale.meridiemHour != null) {
        return locale.meridiemHour(hour, meridiem);
      } else if (locale.isPM != null) {
        // Fallback
        isPm = locale.isPM(meridiem);

        if (isPm && hour < 12) {
          hour += 12;
        }

        if (!isPm && hour === 12) {
          hour = 0;
        }

        return hour;
      } else {
        // this is not supposed to happen
        return hour;
      }
    } // date from string and array of format strings


    function configFromStringAndArray(config) {
      var tempConfig, bestMoment, scoreToBeat, i, currentScore;

      if (config._f.length === 0) {
        getParsingFlags(config).invalidFormat = true;
        config._d = new Date(NaN);
        return;
      }

      for (i = 0; i < config._f.length; i++) {
        currentScore = 0;
        tempConfig = copyConfig({}, config);

        if (config._useUTC != null) {
          tempConfig._useUTC = config._useUTC;
        }

        tempConfig._f = config._f[i];
        configFromStringAndFormat(tempConfig);

        if (!isValid(tempConfig)) {
          continue;
        } // if there is any input that was not parsed add a penalty for that format


        currentScore += getParsingFlags(tempConfig).charsLeftOver; //or tokens

        currentScore += getParsingFlags(tempConfig).unusedTokens.length * 10;
        getParsingFlags(tempConfig).score = currentScore;

        if (scoreToBeat == null || currentScore < scoreToBeat) {
          scoreToBeat = currentScore;
          bestMoment = tempConfig;
        }
      }

      extend(config, bestMoment || tempConfig);
    }

    function configFromObject(config) {
      if (config._d) {
        return;
      }

      var i = normalizeObjectUnits(config._i);
      config._a = map([i.year, i.month, i.day || i.date, i.hour, i.minute, i.second, i.millisecond], function (obj) {
        return obj && parseInt(obj, 10);
      });
      configFromArray(config);
    }

    function createFromConfig(config) {
      var res = new Moment(checkOverflow(prepareConfig(config)));

      if (res._nextDay) {
        // Adding is smart enough around DST
        res.add(1, 'd');
        res._nextDay = undefined;
      }

      return res;
    }

    function prepareConfig(config) {
      var input = config._i,
          format = config._f;
      config._locale = config._locale || getLocale(config._l);

      if (input === null || format === undefined && input === '') {
        return createInvalid({
          nullInput: true
        });
      }

      if (typeof input === 'string') {
        config._i = input = config._locale.preparse(input);
      }

      if (isMoment(input)) {
        return new Moment(checkOverflow(input));
      } else if (isDate(input)) {
        config._d = input;
      } else if (isArray(format)) {
        configFromStringAndArray(config);
      } else if (format) {
        configFromStringAndFormat(config);
      } else {
        configFromInput(config);
      }

      if (!isValid(config)) {
        config._d = null;
      }

      return config;
    }

    function configFromInput(config) {
      var input = config._i;

      if (isUndefined(input)) {
        config._d = new Date(hooks.now());
      } else if (isDate(input)) {
        config._d = new Date(input.valueOf());
      } else if (typeof input === 'string') {
        configFromString(config);
      } else if (isArray(input)) {
        config._a = map(input.slice(0), function (obj) {
          return parseInt(obj, 10);
        });
        configFromArray(config);
      } else if (isObject(input)) {
        configFromObject(config);
      } else if (isNumber(input)) {
        // from milliseconds
        config._d = new Date(input);
      } else {
        hooks.createFromInputFallback(config);
      }
    }

    function createLocalOrUTC(input, format, locale, strict, isUTC) {
      var c = {};

      if (locale === true || locale === false) {
        strict = locale;
        locale = undefined;
      }

      if (isObject(input) && isObjectEmpty(input) || isArray(input) && input.length === 0) {
        input = undefined;
      } // object construction must be done this way.
      // https://github.com/moment/moment/issues/1423


      c._isAMomentObject = true;
      c._useUTC = c._isUTC = isUTC;
      c._l = locale;
      c._i = input;
      c._f = format;
      c._strict = strict;
      return createFromConfig(c);
    }

    function createLocal(input, format, locale, strict) {
      return createLocalOrUTC(input, format, locale, strict, false);
    }

    var prototypeMin = deprecate('moment().min is deprecated, use moment.max instead. http://momentjs.com/guides/#/warnings/min-max/', function () {
      var other = createLocal.apply(null, arguments);

      if (this.isValid() && other.isValid()) {
        return other < this ? this : other;
      } else {
        return createInvalid();
      }
    });
    var prototypeMax = deprecate('moment().max is deprecated, use moment.min instead. http://momentjs.com/guides/#/warnings/min-max/', function () {
      var other = createLocal.apply(null, arguments);

      if (this.isValid() && other.isValid()) {
        return other > this ? this : other;
      } else {
        return createInvalid();
      }
    }); // Pick a moment m from moments so that m[fn](other) is true for all
    // other. This relies on the function fn to be transitive.
    //
    // moments should either be an array of moment objects or an array, whose
    // first element is an array of moment objects.

    function pickBy(fn, moments) {
      var res, i;

      if (moments.length === 1 && isArray(moments[0])) {
        moments = moments[0];
      }

      if (!moments.length) {
        return createLocal();
      }

      res = moments[0];

      for (i = 1; i < moments.length; ++i) {
        if (!moments[i].isValid() || moments[i][fn](res)) {
          res = moments[i];
        }
      }

      return res;
    } // TODO: Use [].sort instead?


    function min() {
      var args = [].slice.call(arguments, 0);
      return pickBy('isBefore', args);
    }

    function max() {
      var args = [].slice.call(arguments, 0);
      return pickBy('isAfter', args);
    }

    var now = function () {
      return Date.now ? Date.now() : +new Date();
    };

    var ordering = ['year', 'quarter', 'month', 'week', 'day', 'hour', 'minute', 'second', 'millisecond'];

    function isDurationValid(m) {
      for (var key in m) {
        if (!(indexOf.call(ordering, key) !== -1 && (m[key] == null || !isNaN(m[key])))) {
          return false;
        }
      }

      var unitHasDecimal = false;

      for (var i = 0; i < ordering.length; ++i) {
        if (m[ordering[i]]) {
          if (unitHasDecimal) {
            return false; // only allow non-integers for smallest unit
          }

          if (parseFloat(m[ordering[i]]) !== toInt(m[ordering[i]])) {
            unitHasDecimal = true;
          }
        }
      }

      return true;
    }

    function isValid$1() {
      return this._isValid;
    }

    function createInvalid$1() {
      return createDuration(NaN);
    }

    function Duration(duration) {
      var normalizedInput = normalizeObjectUnits(duration),
          years = normalizedInput.year || 0,
          quarters = normalizedInput.quarter || 0,
          months = normalizedInput.month || 0,
          weeks = normalizedInput.week || normalizedInput.isoWeek || 0,
          days = normalizedInput.day || 0,
          hours = normalizedInput.hour || 0,
          minutes = normalizedInput.minute || 0,
          seconds = normalizedInput.second || 0,
          milliseconds = normalizedInput.millisecond || 0;
      this._isValid = isDurationValid(normalizedInput); // representation for dateAddRemove

      this._milliseconds = +milliseconds + seconds * 1e3 + // 1000
      minutes * 6e4 + // 1000 * 60
      hours * 1000 * 60 * 60; //using 1000 * 60 * 60 instead of 36e5 to avoid floating point rounding errors https://github.com/moment/moment/issues/2978
      // Because of dateAddRemove treats 24 hours as different from a
      // day when working around DST, we need to store them separately

      this._days = +days + weeks * 7; // It is impossible to translate months into days without knowing
      // which months you are are talking about, so we have to store
      // it separately.

      this._months = +months + quarters * 3 + years * 12;
      this._data = {};
      this._locale = getLocale();

      this._bubble();
    }

    function isDuration(obj) {
      return obj instanceof Duration;
    }

    function absRound(number) {
      if (number < 0) {
        return Math.round(-1 * number) * -1;
      } else {
        return Math.round(number);
      }
    } // FORMATTING


    function offset(token, separator) {
      addFormatToken(token, 0, 0, function () {
        var offset = this.utcOffset();
        var sign = '+';

        if (offset < 0) {
          offset = -offset;
          sign = '-';
        }

        return sign + zeroFill(~~(offset / 60), 2) + separator + zeroFill(~~offset % 60, 2);
      });
    }

    offset('Z', ':');
    offset('ZZ', ''); // PARSING

    addRegexToken('Z', matchShortOffset);
    addRegexToken('ZZ', matchShortOffset);
    addParseToken(['Z', 'ZZ'], function (input, array, config) {
      config._useUTC = true;
      config._tzm = offsetFromString(matchShortOffset, input);
    }); // HELPERS
    // timezone chunker
    // '+10:00' > ['10',  '00']
    // '-1530'  > ['-15', '30']

    var chunkOffset = /([\+\-]|\d\d)/gi;

    function offsetFromString(matcher, string) {
      var matches = (string || '').match(matcher);

      if (matches === null) {
        return null;
      }

      var chunk = matches[matches.length - 1] || [];
      var parts = (chunk + '').match(chunkOffset) || ['-', 0, 0];
      var minutes = +(parts[1] * 60) + toInt(parts[2]);
      return minutes === 0 ? 0 : parts[0] === '+' ? minutes : -minutes;
    } // Return a moment from input, that is local/utc/zone equivalent to model.


    function cloneWithOffset(input, model) {
      var res, diff;

      if (model._isUTC) {
        res = model.clone();
        diff = (isMoment(input) || isDate(input) ? input.valueOf() : createLocal(input).valueOf()) - res.valueOf(); // Use low-level api, because this fn is low-level api.

        res._d.setTime(res._d.valueOf() + diff);

        hooks.updateOffset(res, false);
        return res;
      } else {
        return createLocal(input).local();
      }
    }

    function getDateOffset(m) {
      // On Firefox.24 Date#getTimezoneOffset returns a floating point.
      // https://github.com/moment/moment/pull/1871
      return -Math.round(m._d.getTimezoneOffset() / 15) * 15;
    } // HOOKS
    // This function will be called whenever a moment is mutated.
    // It is intended to keep the offset in sync with the timezone.


    hooks.updateOffset = function () {}; // MOMENTS
    // keepLocalTime = true means only change the timezone, without
    // affecting the local hour. So 5:31:26 +0300 --[utcOffset(2, true)]-->
    // 5:31:26 +0200 It is possible that 5:31:26 doesn't exist with offset
    // +0200, so we adjust the time as needed, to be valid.
    //
    // Keeping the time actually adds/subtracts (one hour)
    // from the actual represented time. That is why we call updateOffset
    // a second time. In case it wants us to change the offset again
    // _changeInProgress == true case, then we have to adjust, because
    // there is no such time in the given timezone.


    function getSetOffset(input, keepLocalTime, keepMinutes) {
      var offset = this._offset || 0,
          localAdjust;

      if (!this.isValid()) {
        return input != null ? this : NaN;
      }

      if (input != null) {
        if (typeof input === 'string') {
          input = offsetFromString(matchShortOffset, input);

          if (input === null) {
            return this;
          }
        } else if (Math.abs(input) < 16 && !keepMinutes) {
          input = input * 60;
        }

        if (!this._isUTC && keepLocalTime) {
          localAdjust = getDateOffset(this);
        }

        this._offset = input;
        this._isUTC = true;

        if (localAdjust != null) {
          this.add(localAdjust, 'm');
        }

        if (offset !== input) {
          if (!keepLocalTime || this._changeInProgress) {
            addSubtract(this, createDuration(input - offset, 'm'), 1, false);
          } else if (!this._changeInProgress) {
            this._changeInProgress = true;
            hooks.updateOffset(this, true);
            this._changeInProgress = null;
          }
        }

        return this;
      } else {
        return this._isUTC ? offset : getDateOffset(this);
      }
    }

    function getSetZone(input, keepLocalTime) {
      if (input != null) {
        if (typeof input !== 'string') {
          input = -input;
        }

        this.utcOffset(input, keepLocalTime);
        return this;
      } else {
        return -this.utcOffset();
      }
    }

    function setOffsetToUTC(keepLocalTime) {
      return this.utcOffset(0, keepLocalTime);
    }

    function setOffsetToLocal(keepLocalTime) {
      if (this._isUTC) {
        this.utcOffset(0, keepLocalTime);
        this._isUTC = false;

        if (keepLocalTime) {
          this.subtract(getDateOffset(this), 'm');
        }
      }

      return this;
    }

    function setOffsetToParsedOffset() {
      if (this._tzm != null) {
        this.utcOffset(this._tzm, false, true);
      } else if (typeof this._i === 'string') {
        var tZone = offsetFromString(matchOffset, this._i);

        if (tZone != null) {
          this.utcOffset(tZone);
        } else {
          this.utcOffset(0, true);
        }
      }

      return this;
    }

    function hasAlignedHourOffset(input) {
      if (!this.isValid()) {
        return false;
      }

      input = input ? createLocal(input).utcOffset() : 0;
      return (this.utcOffset() - input) % 60 === 0;
    }

    function isDaylightSavingTime() {
      return this.utcOffset() > this.clone().month(0).utcOffset() || this.utcOffset() > this.clone().month(5).utcOffset();
    }

    function isDaylightSavingTimeShifted() {
      if (!isUndefined(this._isDSTShifted)) {
        return this._isDSTShifted;
      }

      var c = {};
      copyConfig(c, this);
      c = prepareConfig(c);

      if (c._a) {
        var other = c._isUTC ? createUTC(c._a) : createLocal(c._a);
        this._isDSTShifted = this.isValid() && compareArrays(c._a, other.toArray()) > 0;
      } else {
        this._isDSTShifted = false;
      }

      return this._isDSTShifted;
    }

    function isLocal() {
      return this.isValid() ? !this._isUTC : false;
    }

    function isUtcOffset() {
      return this.isValid() ? this._isUTC : false;
    }

    function isUtc() {
      return this.isValid() ? this._isUTC && this._offset === 0 : false;
    } // ASP.NET json date format regex


    var aspNetRegex = /^(\-|\+)?(?:(\d*)[. ])?(\d+)\:(\d+)(?:\:(\d+)(\.\d*)?)?$/; // from http://docs.closure-library.googlecode.com/git/closure_goog_date_date.js.source.html
    // somewhat more in line with 4.4.3.2 2004 spec, but allows decimal anywhere
    // and further modified to allow for strings containing both week and day

    var isoRegex = /^(-|\+)?P(?:([-+]?[0-9,.]*)Y)?(?:([-+]?[0-9,.]*)M)?(?:([-+]?[0-9,.]*)W)?(?:([-+]?[0-9,.]*)D)?(?:T(?:([-+]?[0-9,.]*)H)?(?:([-+]?[0-9,.]*)M)?(?:([-+]?[0-9,.]*)S)?)?$/;

    function createDuration(input, key) {
      var duration = input,
          // matching against regexp is expensive, do it on demand
      match = null,
          sign,
          ret,
          diffRes;

      if (isDuration(input)) {
        duration = {
          ms: input._milliseconds,
          d: input._days,
          M: input._months
        };
      } else if (isNumber(input)) {
        duration = {};

        if (key) {
          duration[key] = input;
        } else {
          duration.milliseconds = input;
        }
      } else if (!!(match = aspNetRegex.exec(input))) {
        sign = match[1] === '-' ? -1 : 1;
        duration = {
          y: 0,
          d: toInt(match[DATE]) * sign,
          h: toInt(match[HOUR]) * sign,
          m: toInt(match[MINUTE]) * sign,
          s: toInt(match[SECOND]) * sign,
          ms: toInt(absRound(match[MILLISECOND] * 1000)) * sign // the millisecond decimal point is included in the match

        };
      } else if (!!(match = isoRegex.exec(input))) {
        sign = match[1] === '-' ? -1 : 1;
        duration = {
          y: parseIso(match[2], sign),
          M: parseIso(match[3], sign),
          w: parseIso(match[4], sign),
          d: parseIso(match[5], sign),
          h: parseIso(match[6], sign),
          m: parseIso(match[7], sign),
          s: parseIso(match[8], sign)
        };
      } else if (duration == null) {
        // checks for null or undefined
        duration = {};
      } else if (typeof duration === 'object' && ('from' in duration || 'to' in duration)) {
        diffRes = momentsDifference(createLocal(duration.from), createLocal(duration.to));
        duration = {};
        duration.ms = diffRes.milliseconds;
        duration.M = diffRes.months;
      }

      ret = new Duration(duration);

      if (isDuration(input) && hasOwnProp(input, '_locale')) {
        ret._locale = input._locale;
      }

      return ret;
    }

    createDuration.fn = Duration.prototype;
    createDuration.invalid = createInvalid$1;

    function parseIso(inp, sign) {
      // We'd normally use ~~inp for this, but unfortunately it also
      // converts floats to ints.
      // inp may be undefined, so careful calling replace on it.
      var res = inp && parseFloat(inp.replace(',', '.')); // apply sign while we're at it

      return (isNaN(res) ? 0 : res) * sign;
    }

    function positiveMomentsDifference(base, other) {
      var res = {};
      res.months = other.month() - base.month() + (other.year() - base.year()) * 12;

      if (base.clone().add(res.months, 'M').isAfter(other)) {
        --res.months;
      }

      res.milliseconds = +other - +base.clone().add(res.months, 'M');
      return res;
    }

    function momentsDifference(base, other) {
      var res;

      if (!(base.isValid() && other.isValid())) {
        return {
          milliseconds: 0,
          months: 0
        };
      }

      other = cloneWithOffset(other, base);

      if (base.isBefore(other)) {
        res = positiveMomentsDifference(base, other);
      } else {
        res = positiveMomentsDifference(other, base);
        res.milliseconds = -res.milliseconds;
        res.months = -res.months;
      }

      return res;
    } // TODO: remove 'name' arg after deprecation is removed


    function createAdder(direction, name) {
      return function (val, period) {
        var dur, tmp; //invert the arguments, but complain about it

        if (period !== null && !isNaN(+period)) {
          deprecateSimple(name, 'moment().' + name + '(period, number) is deprecated. Please use moment().' + name + '(number, period). ' + 'See http://momentjs.com/guides/#/warnings/add-inverted-param/ for more info.');
          tmp = val;
          val = period;
          period = tmp;
        }

        val = typeof val === 'string' ? +val : val;
        dur = createDuration(val, period);
        addSubtract(this, dur, direction);
        return this;
      };
    }

    function addSubtract(mom, duration, isAdding, updateOffset) {
      var milliseconds = duration._milliseconds,
          days = absRound(duration._days),
          months = absRound(duration._months);

      if (!mom.isValid()) {
        // No op
        return;
      }

      updateOffset = updateOffset == null ? true : updateOffset;

      if (months) {
        setMonth(mom, get(mom, 'Month') + months * isAdding);
      }

      if (days) {
        set$1(mom, 'Date', get(mom, 'Date') + days * isAdding);
      }

      if (milliseconds) {
        mom._d.setTime(mom._d.valueOf() + milliseconds * isAdding);
      }

      if (updateOffset) {
        hooks.updateOffset(mom, days || months);
      }
    }

    var add = createAdder(1, 'add');
    var subtract = createAdder(-1, 'subtract');

    function getCalendarFormat(myMoment, now) {
      var diff = myMoment.diff(now, 'days', true);
      return diff < -6 ? 'sameElse' : diff < -1 ? 'lastWeek' : diff < 0 ? 'lastDay' : diff < 1 ? 'sameDay' : diff < 2 ? 'nextDay' : diff < 7 ? 'nextWeek' : 'sameElse';
    }

    function calendar$1(time, formats) {
      // We want to compare the start of today, vs this.
      // Getting start-of-today depends on whether we're local/utc/offset or not.
      var now = time || createLocal(),
          sod = cloneWithOffset(now, this).startOf('day'),
          format = hooks.calendarFormat(this, sod) || 'sameElse';
      var output = formats && (isFunction(formats[format]) ? formats[format].call(this, now) : formats[format]);
      return this.format(output || this.localeData().calendar(format, this, createLocal(now)));
    }

    function clone() {
      return new Moment(this);
    }

    function isAfter(input, units) {
      var localInput = isMoment(input) ? input : createLocal(input);

      if (!(this.isValid() && localInput.isValid())) {
        return false;
      }

      units = normalizeUnits(units) || 'millisecond';

      if (units === 'millisecond') {
        return this.valueOf() > localInput.valueOf();
      } else {
        return localInput.valueOf() < this.clone().startOf(units).valueOf();
      }
    }

    function isBefore(input, units) {
      var localInput = isMoment(input) ? input : createLocal(input);

      if (!(this.isValid() && localInput.isValid())) {
        return false;
      }

      units = normalizeUnits(units) || 'millisecond';

      if (units === 'millisecond') {
        return this.valueOf() < localInput.valueOf();
      } else {
        return this.clone().endOf(units).valueOf() < localInput.valueOf();
      }
    }

    function isBetween(from, to, units, inclusivity) {
      var localFrom = isMoment(from) ? from : createLocal(from),
          localTo = isMoment(to) ? to : createLocal(to);

      if (!(this.isValid() && localFrom.isValid() && localTo.isValid())) {
        return false;
      }

      inclusivity = inclusivity || '()';
      return (inclusivity[0] === '(' ? this.isAfter(localFrom, units) : !this.isBefore(localFrom, units)) && (inclusivity[1] === ')' ? this.isBefore(localTo, units) : !this.isAfter(localTo, units));
    }

    function isSame(input, units) {
      var localInput = isMoment(input) ? input : createLocal(input),
          inputMs;

      if (!(this.isValid() && localInput.isValid())) {
        return false;
      }

      units = normalizeUnits(units) || 'millisecond';

      if (units === 'millisecond') {
        return this.valueOf() === localInput.valueOf();
      } else {
        inputMs = localInput.valueOf();
        return this.clone().startOf(units).valueOf() <= inputMs && inputMs <= this.clone().endOf(units).valueOf();
      }
    }

    function isSameOrAfter(input, units) {
      return this.isSame(input, units) || this.isAfter(input, units);
    }

    function isSameOrBefore(input, units) {
      return this.isSame(input, units) || this.isBefore(input, units);
    }

    function diff(input, units, asFloat) {
      var that, zoneDelta, output;

      if (!this.isValid()) {
        return NaN;
      }

      that = cloneWithOffset(input, this);

      if (!that.isValid()) {
        return NaN;
      }

      zoneDelta = (that.utcOffset() - this.utcOffset()) * 6e4;
      units = normalizeUnits(units);

      switch (units) {
        case 'year':
          output = monthDiff(this, that) / 12;
          break;

        case 'month':
          output = monthDiff(this, that);
          break;

        case 'quarter':
          output = monthDiff(this, that) / 3;
          break;

        case 'second':
          output = (this - that) / 1e3;
          break;
        // 1000

        case 'minute':
          output = (this - that) / 6e4;
          break;
        // 1000 * 60

        case 'hour':
          output = (this - that) / 36e5;
          break;
        // 1000 * 60 * 60

        case 'day':
          output = (this - that - zoneDelta) / 864e5;
          break;
        // 1000 * 60 * 60 * 24, negate dst

        case 'week':
          output = (this - that - zoneDelta) / 6048e5;
          break;
        // 1000 * 60 * 60 * 24 * 7, negate dst

        default:
          output = this - that;
      }

      return asFloat ? output : absFloor(output);
    }

    function monthDiff(a, b) {
      // difference in months
      var wholeMonthDiff = (b.year() - a.year()) * 12 + (b.month() - a.month()),
          // b is in (anchor - 1 month, anchor + 1 month)
      anchor = a.clone().add(wholeMonthDiff, 'months'),
          anchor2,
          adjust;

      if (b - anchor < 0) {
        anchor2 = a.clone().add(wholeMonthDiff - 1, 'months'); // linear across the month

        adjust = (b - anchor) / (anchor - anchor2);
      } else {
        anchor2 = a.clone().add(wholeMonthDiff + 1, 'months'); // linear across the month

        adjust = (b - anchor) / (anchor2 - anchor);
      } //check for negative zero, return zero if negative zero


      return -(wholeMonthDiff + adjust) || 0;
    }

    hooks.defaultFormat = 'YYYY-MM-DDTHH:mm:ssZ';
    hooks.defaultFormatUtc = 'YYYY-MM-DDTHH:mm:ss[Z]';

    function toString() {
      return this.clone().locale('en').format('ddd MMM DD YYYY HH:mm:ss [GMT]ZZ');
    }

    function toISOString(keepOffset) {
      if (!this.isValid()) {
        return null;
      }

      var utc = keepOffset !== true;
      var m = utc ? this.clone().utc() : this;

      if (m.year() < 0 || m.year() > 9999) {
        return formatMoment(m, utc ? 'YYYYYY-MM-DD[T]HH:mm:ss.SSS[Z]' : 'YYYYYY-MM-DD[T]HH:mm:ss.SSSZ');
      }

      if (isFunction(Date.prototype.toISOString)) {
        // native implementation is ~50x faster, use it when we can
        if (utc) {
          return this.toDate().toISOString();
        } else {
          return new Date(this.valueOf() + this.utcOffset() * 60 * 1000).toISOString().replace('Z', formatMoment(m, 'Z'));
        }
      }

      return formatMoment(m, utc ? 'YYYY-MM-DD[T]HH:mm:ss.SSS[Z]' : 'YYYY-MM-DD[T]HH:mm:ss.SSSZ');
    }
    /**
     * Return a human readable representation of a moment that can
     * also be evaluated to get a new moment which is the same
     *
     * @link https://nodejs.org/dist/latest/docs/api/util.html#util_custom_inspect_function_on_objects
     */


    function inspect() {
      if (!this.isValid()) {
        return 'moment.invalid(/* ' + this._i + ' */)';
      }

      var func = 'moment';
      var zone = '';

      if (!this.isLocal()) {
        func = this.utcOffset() === 0 ? 'moment.utc' : 'moment.parseZone';
        zone = 'Z';
      }

      var prefix = '[' + func + '("]';
      var year = 0 <= this.year() && this.year() <= 9999 ? 'YYYY' : 'YYYYYY';
      var datetime = '-MM-DD[T]HH:mm:ss.SSS';
      var suffix = zone + '[")]';
      return this.format(prefix + year + datetime + suffix);
    }

    function format(inputString) {
      if (!inputString) {
        inputString = this.isUtc() ? hooks.defaultFormatUtc : hooks.defaultFormat;
      }

      var output = formatMoment(this, inputString);
      return this.localeData().postformat(output);
    }

    function from(time, withoutSuffix) {
      if (this.isValid() && (isMoment(time) && time.isValid() || createLocal(time).isValid())) {
        return createDuration({
          to: this,
          from: time
        }).locale(this.locale()).humanize(!withoutSuffix);
      } else {
        return this.localeData().invalidDate();
      }
    }

    function fromNow(withoutSuffix) {
      return this.from(createLocal(), withoutSuffix);
    }

    function to(time, withoutSuffix) {
      if (this.isValid() && (isMoment(time) && time.isValid() || createLocal(time).isValid())) {
        return createDuration({
          from: this,
          to: time
        }).locale(this.locale()).humanize(!withoutSuffix);
      } else {
        return this.localeData().invalidDate();
      }
    }

    function toNow(withoutSuffix) {
      return this.to(createLocal(), withoutSuffix);
    } // If passed a locale key, it will set the locale for this
    // instance.  Otherwise, it will return the locale configuration
    // variables for this instance.


    function locale(key) {
      var newLocaleData;

      if (key === undefined) {
        return this._locale._abbr;
      } else {
        newLocaleData = getLocale(key);

        if (newLocaleData != null) {
          this._locale = newLocaleData;
        }

        return this;
      }
    }

    var lang = deprecate('moment().lang() is deprecated. Instead, use moment().localeData() to get the language configuration. Use moment().locale() to change languages.', function (key) {
      if (key === undefined) {
        return this.localeData();
      } else {
        return this.locale(key);
      }
    });

    function localeData() {
      return this._locale;
    }

    var MS_PER_SECOND = 1000;
    var MS_PER_MINUTE = 60 * MS_PER_SECOND;
    var MS_PER_HOUR = 60 * MS_PER_MINUTE;
    var MS_PER_400_YEARS = (365 * 400 + 97) * 24 * MS_PER_HOUR; // actual modulo - handles negative numbers (for dates before 1970):

    function mod$1(dividend, divisor) {
      return (dividend % divisor + divisor) % divisor;
    }

    function localStartOfDate(y, m, d) {
      // the date constructor remaps years 0-99 to 1900-1999
      if (y < 100 && y >= 0) {
        // preserve leap years using a full 400 year cycle, then reset
        return new Date(y + 400, m, d) - MS_PER_400_YEARS;
      } else {
        return new Date(y, m, d).valueOf();
      }
    }

    function utcStartOfDate(y, m, d) {
      // Date.UTC remaps years 0-99 to 1900-1999
      if (y < 100 && y >= 0) {
        // preserve leap years using a full 400 year cycle, then reset
        return Date.UTC(y + 400, m, d) - MS_PER_400_YEARS;
      } else {
        return Date.UTC(y, m, d);
      }
    }

    function startOf(units) {
      var time;
      units = normalizeUnits(units);

      if (units === undefined || units === 'millisecond' || !this.isValid()) {
        return this;
      }

      var startOfDate = this._isUTC ? utcStartOfDate : localStartOfDate;

      switch (units) {
        case 'year':
          time = startOfDate(this.year(), 0, 1);
          break;

        case 'quarter':
          time = startOfDate(this.year(), this.month() - this.month() % 3, 1);
          break;

        case 'month':
          time = startOfDate(this.year(), this.month(), 1);
          break;

        case 'week':
          time = startOfDate(this.year(), this.month(), this.date() - this.weekday());
          break;

        case 'isoWeek':
          time = startOfDate(this.year(), this.month(), this.date() - (this.isoWeekday() - 1));
          break;

        case 'day':
        case 'date':
          time = startOfDate(this.year(), this.month(), this.date());
          break;

        case 'hour':
          time = this._d.valueOf();
          time -= mod$1(time + (this._isUTC ? 0 : this.utcOffset() * MS_PER_MINUTE), MS_PER_HOUR);
          break;

        case 'minute':
          time = this._d.valueOf();
          time -= mod$1(time, MS_PER_MINUTE);
          break;

        case 'second':
          time = this._d.valueOf();
          time -= mod$1(time, MS_PER_SECOND);
          break;
      }

      this._d.setTime(time);

      hooks.updateOffset(this, true);
      return this;
    }

    function endOf(units) {
      var time;
      units = normalizeUnits(units);

      if (units === undefined || units === 'millisecond' || !this.isValid()) {
        return this;
      }

      var startOfDate = this._isUTC ? utcStartOfDate : localStartOfDate;

      switch (units) {
        case 'year':
          time = startOfDate(this.year() + 1, 0, 1) - 1;
          break;

        case 'quarter':
          time = startOfDate(this.year(), this.month() - this.month() % 3 + 3, 1) - 1;
          break;

        case 'month':
          time = startOfDate(this.year(), this.month() + 1, 1) - 1;
          break;

        case 'week':
          time = startOfDate(this.year(), this.month(), this.date() - this.weekday() + 7) - 1;
          break;

        case 'isoWeek':
          time = startOfDate(this.year(), this.month(), this.date() - (this.isoWeekday() - 1) + 7) - 1;
          break;

        case 'day':
        case 'date':
          time = startOfDate(this.year(), this.month(), this.date() + 1) - 1;
          break;

        case 'hour':
          time = this._d.valueOf();
          time += MS_PER_HOUR - mod$1(time + (this._isUTC ? 0 : this.utcOffset() * MS_PER_MINUTE), MS_PER_HOUR) - 1;
          break;

        case 'minute':
          time = this._d.valueOf();
          time += MS_PER_MINUTE - mod$1(time, MS_PER_MINUTE) - 1;
          break;

        case 'second':
          time = this._d.valueOf();
          time += MS_PER_SECOND - mod$1(time, MS_PER_SECOND) - 1;
          break;
      }

      this._d.setTime(time);

      hooks.updateOffset(this, true);
      return this;
    }

    function valueOf() {
      return this._d.valueOf() - (this._offset || 0) * 60000;
    }

    function unix() {
      return Math.floor(this.valueOf() / 1000);
    }

    function toDate() {
      return new Date(this.valueOf());
    }

    function toArray() {
      var m = this;
      return [m.year(), m.month(), m.date(), m.hour(), m.minute(), m.second(), m.millisecond()];
    }

    function toObject() {
      var m = this;
      return {
        years: m.year(),
        months: m.month(),
        date: m.date(),
        hours: m.hours(),
        minutes: m.minutes(),
        seconds: m.seconds(),
        milliseconds: m.milliseconds()
      };
    }

    function toJSON() {
      // new Date(NaN).toJSON() === null
      return this.isValid() ? this.toISOString() : null;
    }

    function isValid$2() {
      return isValid(this);
    }

    function parsingFlags() {
      return extend({}, getParsingFlags(this));
    }

    function invalidAt() {
      return getParsingFlags(this).overflow;
    }

    function creationData() {
      return {
        input: this._i,
        format: this._f,
        locale: this._locale,
        isUTC: this._isUTC,
        strict: this._strict
      };
    } // FORMATTING


    addFormatToken(0, ['gg', 2], 0, function () {
      return this.weekYear() % 100;
    });
    addFormatToken(0, ['GG', 2], 0, function () {
      return this.isoWeekYear() % 100;
    });

    function addWeekYearFormatToken(token, getter) {
      addFormatToken(0, [token, token.length], 0, getter);
    }

    addWeekYearFormatToken('gggg', 'weekYear');
    addWeekYearFormatToken('ggggg', 'weekYear');
    addWeekYearFormatToken('GGGG', 'isoWeekYear');
    addWeekYearFormatToken('GGGGG', 'isoWeekYear'); // ALIASES

    addUnitAlias('weekYear', 'gg');
    addUnitAlias('isoWeekYear', 'GG'); // PRIORITY

    addUnitPriority('weekYear', 1);
    addUnitPriority('isoWeekYear', 1); // PARSING

    addRegexToken('G', matchSigned);
    addRegexToken('g', matchSigned);
    addRegexToken('GG', match1to2, match2);
    addRegexToken('gg', match1to2, match2);
    addRegexToken('GGGG', match1to4, match4);
    addRegexToken('gggg', match1to4, match4);
    addRegexToken('GGGGG', match1to6, match6);
    addRegexToken('ggggg', match1to6, match6);
    addWeekParseToken(['gggg', 'ggggg', 'GGGG', 'GGGGG'], function (input, week, config, token) {
      week[token.substr(0, 2)] = toInt(input);
    });
    addWeekParseToken(['gg', 'GG'], function (input, week, config, token) {
      week[token] = hooks.parseTwoDigitYear(input);
    }); // MOMENTS

    function getSetWeekYear(input) {
      return getSetWeekYearHelper.call(this, input, this.week(), this.weekday(), this.localeData()._week.dow, this.localeData()._week.doy);
    }

    function getSetISOWeekYear(input) {
      return getSetWeekYearHelper.call(this, input, this.isoWeek(), this.isoWeekday(), 1, 4);
    }

    function getISOWeeksInYear() {
      return weeksInYear(this.year(), 1, 4);
    }

    function getWeeksInYear() {
      var weekInfo = this.localeData()._week;

      return weeksInYear(this.year(), weekInfo.dow, weekInfo.doy);
    }

    function getSetWeekYearHelper(input, week, weekday, dow, doy) {
      var weeksTarget;

      if (input == null) {
        return weekOfYear(this, dow, doy).year;
      } else {
        weeksTarget = weeksInYear(input, dow, doy);

        if (week > weeksTarget) {
          week = weeksTarget;
        }

        return setWeekAll.call(this, input, week, weekday, dow, doy);
      }
    }

    function setWeekAll(weekYear, week, weekday, dow, doy) {
      var dayOfYearData = dayOfYearFromWeeks(weekYear, week, weekday, dow, doy),
          date = createUTCDate(dayOfYearData.year, 0, dayOfYearData.dayOfYear);
      this.year(date.getUTCFullYear());
      this.month(date.getUTCMonth());
      this.date(date.getUTCDate());
      return this;
    } // FORMATTING


    addFormatToken('Q', 0, 'Qo', 'quarter'); // ALIASES

    addUnitAlias('quarter', 'Q'); // PRIORITY

    addUnitPriority('quarter', 7); // PARSING

    addRegexToken('Q', match1);
    addParseToken('Q', function (input, array) {
      array[MONTH] = (toInt(input) - 1) * 3;
    }); // MOMENTS

    function getSetQuarter(input) {
      return input == null ? Math.ceil((this.month() + 1) / 3) : this.month((input - 1) * 3 + this.month() % 3);
    } // FORMATTING


    addFormatToken('D', ['DD', 2], 'Do', 'date'); // ALIASES

    addUnitAlias('date', 'D'); // PRIORITY

    addUnitPriority('date', 9); // PARSING

    addRegexToken('D', match1to2);
    addRegexToken('DD', match1to2, match2);
    addRegexToken('Do', function (isStrict, locale) {
      // TODO: Remove "ordinalParse" fallback in next major release.
      return isStrict ? locale._dayOfMonthOrdinalParse || locale._ordinalParse : locale._dayOfMonthOrdinalParseLenient;
    });
    addParseToken(['D', 'DD'], DATE);
    addParseToken('Do', function (input, array) {
      array[DATE] = toInt(input.match(match1to2)[0]);
    }); // MOMENTS

    var getSetDayOfMonth = makeGetSet('Date', true); // FORMATTING

    addFormatToken('DDD', ['DDDD', 3], 'DDDo', 'dayOfYear'); // ALIASES

    addUnitAlias('dayOfYear', 'DDD'); // PRIORITY

    addUnitPriority('dayOfYear', 4); // PARSING

    addRegexToken('DDD', match1to3);
    addRegexToken('DDDD', match3);
    addParseToken(['DDD', 'DDDD'], function (input, array, config) {
      config._dayOfYear = toInt(input);
    }); // HELPERS
    // MOMENTS

    function getSetDayOfYear(input) {
      var dayOfYear = Math.round((this.clone().startOf('day') - this.clone().startOf('year')) / 864e5) + 1;
      return input == null ? dayOfYear : this.add(input - dayOfYear, 'd');
    } // FORMATTING


    addFormatToken('m', ['mm', 2], 0, 'minute'); // ALIASES

    addUnitAlias('minute', 'm'); // PRIORITY

    addUnitPriority('minute', 14); // PARSING

    addRegexToken('m', match1to2);
    addRegexToken('mm', match1to2, match2);
    addParseToken(['m', 'mm'], MINUTE); // MOMENTS

    var getSetMinute = makeGetSet('Minutes', false); // FORMATTING

    addFormatToken('s', ['ss', 2], 0, 'second'); // ALIASES

    addUnitAlias('second', 's'); // PRIORITY

    addUnitPriority('second', 15); // PARSING

    addRegexToken('s', match1to2);
    addRegexToken('ss', match1to2, match2);
    addParseToken(['s', 'ss'], SECOND); // MOMENTS

    var getSetSecond = makeGetSet('Seconds', false); // FORMATTING

    addFormatToken('S', 0, 0, function () {
      return ~~(this.millisecond() / 100);
    });
    addFormatToken(0, ['SS', 2], 0, function () {
      return ~~(this.millisecond() / 10);
    });
    addFormatToken(0, ['SSS', 3], 0, 'millisecond');
    addFormatToken(0, ['SSSS', 4], 0, function () {
      return this.millisecond() * 10;
    });
    addFormatToken(0, ['SSSSS', 5], 0, function () {
      return this.millisecond() * 100;
    });
    addFormatToken(0, ['SSSSSS', 6], 0, function () {
      return this.millisecond() * 1000;
    });
    addFormatToken(0, ['SSSSSSS', 7], 0, function () {
      return this.millisecond() * 10000;
    });
    addFormatToken(0, ['SSSSSSSS', 8], 0, function () {
      return this.millisecond() * 100000;
    });
    addFormatToken(0, ['SSSSSSSSS', 9], 0, function () {
      return this.millisecond() * 1000000;
    }); // ALIASES

    addUnitAlias('millisecond', 'ms'); // PRIORITY

    addUnitPriority('millisecond', 16); // PARSING

    addRegexToken('S', match1to3, match1);
    addRegexToken('SS', match1to3, match2);
    addRegexToken('SSS', match1to3, match3);
    var token;

    for (token = 'SSSS'; token.length <= 9; token += 'S') {
      addRegexToken(token, matchUnsigned);
    }

    function parseMs(input, array) {
      array[MILLISECOND] = toInt(('0.' + input) * 1000);
    }

    for (token = 'S'; token.length <= 9; token += 'S') {
      addParseToken(token, parseMs);
    } // MOMENTS


    var getSetMillisecond = makeGetSet('Milliseconds', false); // FORMATTING

    addFormatToken('z', 0, 0, 'zoneAbbr');
    addFormatToken('zz', 0, 0, 'zoneName'); // MOMENTS

    function getZoneAbbr() {
      return this._isUTC ? 'UTC' : '';
    }

    function getZoneName() {
      return this._isUTC ? 'Coordinated Universal Time' : '';
    }

    var proto = Moment.prototype;
    proto.add = add;
    proto.calendar = calendar$1;
    proto.clone = clone;
    proto.diff = diff;
    proto.endOf = endOf;
    proto.format = format;
    proto.from = from;
    proto.fromNow = fromNow;
    proto.to = to;
    proto.toNow = toNow;
    proto.get = stringGet;
    proto.invalidAt = invalidAt;
    proto.isAfter = isAfter;
    proto.isBefore = isBefore;
    proto.isBetween = isBetween;
    proto.isSame = isSame;
    proto.isSameOrAfter = isSameOrAfter;
    proto.isSameOrBefore = isSameOrBefore;
    proto.isValid = isValid$2;
    proto.lang = lang;
    proto.locale = locale;
    proto.localeData = localeData;
    proto.max = prototypeMax;
    proto.min = prototypeMin;
    proto.parsingFlags = parsingFlags;
    proto.set = stringSet;
    proto.startOf = startOf;
    proto.subtract = subtract;
    proto.toArray = toArray;
    proto.toObject = toObject;
    proto.toDate = toDate;
    proto.toISOString = toISOString;
    proto.inspect = inspect;
    proto.toJSON = toJSON;
    proto.toString = toString;
    proto.unix = unix;
    proto.valueOf = valueOf;
    proto.creationData = creationData;
    proto.year = getSetYear;
    proto.isLeapYear = getIsLeapYear;
    proto.weekYear = getSetWeekYear;
    proto.isoWeekYear = getSetISOWeekYear;
    proto.quarter = proto.quarters = getSetQuarter;
    proto.month = getSetMonth;
    proto.daysInMonth = getDaysInMonth;
    proto.week = proto.weeks = getSetWeek;
    proto.isoWeek = proto.isoWeeks = getSetISOWeek;
    proto.weeksInYear = getWeeksInYear;
    proto.isoWeeksInYear = getISOWeeksInYear;
    proto.date = getSetDayOfMonth;
    proto.day = proto.days = getSetDayOfWeek;
    proto.weekday = getSetLocaleDayOfWeek;
    proto.isoWeekday = getSetISODayOfWeek;
    proto.dayOfYear = getSetDayOfYear;
    proto.hour = proto.hours = getSetHour;
    proto.minute = proto.minutes = getSetMinute;
    proto.second = proto.seconds = getSetSecond;
    proto.millisecond = proto.milliseconds = getSetMillisecond;
    proto.utcOffset = getSetOffset;
    proto.utc = setOffsetToUTC;
    proto.local = setOffsetToLocal;
    proto.parseZone = setOffsetToParsedOffset;
    proto.hasAlignedHourOffset = hasAlignedHourOffset;
    proto.isDST = isDaylightSavingTime;
    proto.isLocal = isLocal;
    proto.isUtcOffset = isUtcOffset;
    proto.isUtc = isUtc;
    proto.isUTC = isUtc;
    proto.zoneAbbr = getZoneAbbr;
    proto.zoneName = getZoneName;
    proto.dates = deprecate('dates accessor is deprecated. Use date instead.', getSetDayOfMonth);
    proto.months = deprecate('months accessor is deprecated. Use month instead', getSetMonth);
    proto.years = deprecate('years accessor is deprecated. Use year instead', getSetYear);
    proto.zone = deprecate('moment().zone is deprecated, use moment().utcOffset instead. http://momentjs.com/guides/#/warnings/zone/', getSetZone);
    proto.isDSTShifted = deprecate('isDSTShifted is deprecated. See http://momentjs.com/guides/#/warnings/dst-shifted/ for more information', isDaylightSavingTimeShifted);

    function createUnix(input) {
      return createLocal(input * 1000);
    }

    function createInZone() {
      return createLocal.apply(null, arguments).parseZone();
    }

    function preParsePostFormat(string) {
      return string;
    }

    var proto$1 = Locale.prototype;
    proto$1.calendar = calendar;
    proto$1.longDateFormat = longDateFormat;
    proto$1.invalidDate = invalidDate;
    proto$1.ordinal = ordinal;
    proto$1.preparse = preParsePostFormat;
    proto$1.postformat = preParsePostFormat;
    proto$1.relativeTime = relativeTime;
    proto$1.pastFuture = pastFuture;
    proto$1.set = set;
    proto$1.months = localeMonths;
    proto$1.monthsShort = localeMonthsShort;
    proto$1.monthsParse = localeMonthsParse;
    proto$1.monthsRegex = monthsRegex;
    proto$1.monthsShortRegex = monthsShortRegex;
    proto$1.week = localeWeek;
    proto$1.firstDayOfYear = localeFirstDayOfYear;
    proto$1.firstDayOfWeek = localeFirstDayOfWeek;
    proto$1.weekdays = localeWeekdays;
    proto$1.weekdaysMin = localeWeekdaysMin;
    proto$1.weekdaysShort = localeWeekdaysShort;
    proto$1.weekdaysParse = localeWeekdaysParse;
    proto$1.weekdaysRegex = weekdaysRegex;
    proto$1.weekdaysShortRegex = weekdaysShortRegex;
    proto$1.weekdaysMinRegex = weekdaysMinRegex;
    proto$1.isPM = localeIsPM;
    proto$1.meridiem = localeMeridiem;

    function get$1(format, index, field, setter) {
      var locale = getLocale();
      var utc = createUTC().set(setter, index);
      return locale[field](utc, format);
    }

    function listMonthsImpl(format, index, field) {
      if (isNumber(format)) {
        index = format;
        format = undefined;
      }

      format = format || '';

      if (index != null) {
        return get$1(format, index, field, 'month');
      }

      var i;
      var out = [];

      for (i = 0; i < 12; i++) {
        out[i] = get$1(format, i, field, 'month');
      }

      return out;
    } // ()
    // (5)
    // (fmt, 5)
    // (fmt)
    // (true)
    // (true, 5)
    // (true, fmt, 5)
    // (true, fmt)


    function listWeekdaysImpl(localeSorted, format, index, field) {
      if (typeof localeSorted === 'boolean') {
        if (isNumber(format)) {
          index = format;
          format = undefined;
        }

        format = format || '';
      } else {
        format = localeSorted;
        index = format;
        localeSorted = false;

        if (isNumber(format)) {
          index = format;
          format = undefined;
        }

        format = format || '';
      }

      var locale = getLocale(),
          shift = localeSorted ? locale._week.dow : 0;

      if (index != null) {
        return get$1(format, (index + shift) % 7, field, 'day');
      }

      var i;
      var out = [];

      for (i = 0; i < 7; i++) {
        out[i] = get$1(format, (i + shift) % 7, field, 'day');
      }

      return out;
    }

    function listMonths(format, index) {
      return listMonthsImpl(format, index, 'months');
    }

    function listMonthsShort(format, index) {
      return listMonthsImpl(format, index, 'monthsShort');
    }

    function listWeekdays(localeSorted, format, index) {
      return listWeekdaysImpl(localeSorted, format, index, 'weekdays');
    }

    function listWeekdaysShort(localeSorted, format, index) {
      return listWeekdaysImpl(localeSorted, format, index, 'weekdaysShort');
    }

    function listWeekdaysMin(localeSorted, format, index) {
      return listWeekdaysImpl(localeSorted, format, index, 'weekdaysMin');
    }

    getSetGlobalLocale('en', {
      dayOfMonthOrdinalParse: /\d{1,2}(th|st|nd|rd)/,
      ordinal: function (number) {
        var b = number % 10,
            output = toInt(number % 100 / 10) === 1 ? 'th' : b === 1 ? 'st' : b === 2 ? 'nd' : b === 3 ? 'rd' : 'th';
        return number + output;
      }
    }); // Side effect imports

    hooks.lang = deprecate('moment.lang is deprecated. Use moment.locale instead.', getSetGlobalLocale);
    hooks.langData = deprecate('moment.langData is deprecated. Use moment.localeData instead.', getLocale);
    var mathAbs = Math.abs;

    function abs() {
      var data = this._data;
      this._milliseconds = mathAbs(this._milliseconds);
      this._days = mathAbs(this._days);
      this._months = mathAbs(this._months);
      data.milliseconds = mathAbs(data.milliseconds);
      data.seconds = mathAbs(data.seconds);
      data.minutes = mathAbs(data.minutes);
      data.hours = mathAbs(data.hours);
      data.months = mathAbs(data.months);
      data.years = mathAbs(data.years);
      return this;
    }

    function addSubtract$1(duration, input, value, direction) {
      var other = createDuration(input, value);
      duration._milliseconds += direction * other._milliseconds;
      duration._days += direction * other._days;
      duration._months += direction * other._months;
      return duration._bubble();
    } // supports only 2.0-style add(1, 's') or add(duration)


    function add$1(input, value) {
      return addSubtract$1(this, input, value, 1);
    } // supports only 2.0-style subtract(1, 's') or subtract(duration)


    function subtract$1(input, value) {
      return addSubtract$1(this, input, value, -1);
    }

    function absCeil(number) {
      if (number < 0) {
        return Math.floor(number);
      } else {
        return Math.ceil(number);
      }
    }

    function bubble() {
      var milliseconds = this._milliseconds;
      var days = this._days;
      var months = this._months;
      var data = this._data;
      var seconds, minutes, hours, years, monthsFromDays; // if we have a mix of positive and negative values, bubble down first
      // check: https://github.com/moment/moment/issues/2166

      if (!(milliseconds >= 0 && days >= 0 && months >= 0 || milliseconds <= 0 && days <= 0 && months <= 0)) {
        milliseconds += absCeil(monthsToDays(months) + days) * 864e5;
        days = 0;
        months = 0;
      } // The following code bubbles up values, see the tests for
      // examples of what that means.


      data.milliseconds = milliseconds % 1000;
      seconds = absFloor(milliseconds / 1000);
      data.seconds = seconds % 60;
      minutes = absFloor(seconds / 60);
      data.minutes = minutes % 60;
      hours = absFloor(minutes / 60);
      data.hours = hours % 24;
      days += absFloor(hours / 24); // convert days to months

      monthsFromDays = absFloor(daysToMonths(days));
      months += monthsFromDays;
      days -= absCeil(monthsToDays(monthsFromDays)); // 12 months -> 1 year

      years = absFloor(months / 12);
      months %= 12;
      data.days = days;
      data.months = months;
      data.years = years;
      return this;
    }

    function daysToMonths(days) {
      // 400 years have 146097 days (taking into account leap year rules)
      // 400 years have 12 months === 4800
      return days * 4800 / 146097;
    }

    function monthsToDays(months) {
      // the reverse of daysToMonths
      return months * 146097 / 4800;
    }

    function as(units) {
      if (!this.isValid()) {
        return NaN;
      }

      var days;
      var months;
      var milliseconds = this._milliseconds;
      units = normalizeUnits(units);

      if (units === 'month' || units === 'quarter' || units === 'year') {
        days = this._days + milliseconds / 864e5;
        months = this._months + daysToMonths(days);

        switch (units) {
          case 'month':
            return months;

          case 'quarter':
            return months / 3;

          case 'year':
            return months / 12;
        }
      } else {
        // handle milliseconds separately because of floating point math errors (issue #1867)
        days = this._days + Math.round(monthsToDays(this._months));

        switch (units) {
          case 'week':
            return days / 7 + milliseconds / 6048e5;

          case 'day':
            return days + milliseconds / 864e5;

          case 'hour':
            return days * 24 + milliseconds / 36e5;

          case 'minute':
            return days * 1440 + milliseconds / 6e4;

          case 'second':
            return days * 86400 + milliseconds / 1000;
          // Math.floor prevents floating point math errors here

          case 'millisecond':
            return Math.floor(days * 864e5) + milliseconds;

          default:
            throw new Error('Unknown unit ' + units);
        }
      }
    } // TODO: Use this.as('ms')?


    function valueOf$1() {
      if (!this.isValid()) {
        return NaN;
      }

      return this._milliseconds + this._days * 864e5 + this._months % 12 * 2592e6 + toInt(this._months / 12) * 31536e6;
    }

    function makeAs(alias) {
      return function () {
        return this.as(alias);
      };
    }

    var asMilliseconds = makeAs('ms');
    var asSeconds = makeAs('s');
    var asMinutes = makeAs('m');
    var asHours = makeAs('h');
    var asDays = makeAs('d');
    var asWeeks = makeAs('w');
    var asMonths = makeAs('M');
    var asQuarters = makeAs('Q');
    var asYears = makeAs('y');

    function clone$1() {
      return createDuration(this);
    }

    function get$2(units) {
      units = normalizeUnits(units);
      return this.isValid() ? this[units + 's']() : NaN;
    }

    function makeGetter(name) {
      return function () {
        return this.isValid() ? this._data[name] : NaN;
      };
    }

    var milliseconds = makeGetter('milliseconds');
    var seconds = makeGetter('seconds');
    var minutes = makeGetter('minutes');
    var hours = makeGetter('hours');
    var days = makeGetter('days');
    var months = makeGetter('months');
    var years = makeGetter('years');

    function weeks() {
      return absFloor(this.days() / 7);
    }

    var round = Math.round;
    var thresholds = {
      ss: 44,
      // a few seconds to seconds
      s: 45,
      // seconds to minute
      m: 45,
      // minutes to hour
      h: 22,
      // hours to day
      d: 26,
      // days to month
      M: 11 // months to year

    }; // helper function for moment.fn.from, moment.fn.fromNow, and moment.duration.fn.humanize

    function substituteTimeAgo(string, number, withoutSuffix, isFuture, locale) {
      return locale.relativeTime(number || 1, !!withoutSuffix, string, isFuture);
    }

    function relativeTime$1(posNegDuration, withoutSuffix, locale) {
      var duration = createDuration(posNegDuration).abs();
      var seconds = round(duration.as('s'));
      var minutes = round(duration.as('m'));
      var hours = round(duration.as('h'));
      var days = round(duration.as('d'));
      var months = round(duration.as('M'));
      var years = round(duration.as('y'));
      var a = seconds <= thresholds.ss && ['s', seconds] || seconds < thresholds.s && ['ss', seconds] || minutes <= 1 && ['m'] || minutes < thresholds.m && ['mm', minutes] || hours <= 1 && ['h'] || hours < thresholds.h && ['hh', hours] || days <= 1 && ['d'] || days < thresholds.d && ['dd', days] || months <= 1 && ['M'] || months < thresholds.M && ['MM', months] || years <= 1 && ['y'] || ['yy', years];
      a[2] = withoutSuffix;
      a[3] = +posNegDuration > 0;
      a[4] = locale;
      return substituteTimeAgo.apply(null, a);
    } // This function allows you to set the rounding function for relative time strings


    function getSetRelativeTimeRounding(roundingFunction) {
      if (roundingFunction === undefined) {
        return round;
      }

      if (typeof roundingFunction === 'function') {
        round = roundingFunction;
        return true;
      }

      return false;
    } // This function allows you to set a threshold for relative time strings


    function getSetRelativeTimeThreshold(threshold, limit) {
      if (thresholds[threshold] === undefined) {
        return false;
      }

      if (limit === undefined) {
        return thresholds[threshold];
      }

      thresholds[threshold] = limit;

      if (threshold === 's') {
        thresholds.ss = limit - 1;
      }

      return true;
    }

    function humanize(withSuffix) {
      if (!this.isValid()) {
        return this.localeData().invalidDate();
      }

      var locale = this.localeData();
      var output = relativeTime$1(this, !withSuffix, locale);

      if (withSuffix) {
        output = locale.pastFuture(+this, output);
      }

      return locale.postformat(output);
    }

    var abs$1 = Math.abs;

    function sign(x) {
      return (x > 0) - (x < 0) || +x;
    }

    function toISOString$1() {
      // for ISO strings we do not use the normal bubbling rules:
      //  * milliseconds bubble up until they become hours
      //  * days do not bubble at all
      //  * months bubble up until they become years
      // This is because there is no context-free conversion between hours and days
      // (think of clock changes)
      // and also not between days and months (28-31 days per month)
      if (!this.isValid()) {
        return this.localeData().invalidDate();
      }

      var seconds = abs$1(this._milliseconds) / 1000;
      var days = abs$1(this._days);
      var months = abs$1(this._months);
      var minutes, hours, years; // 3600 seconds -> 60 minutes -> 1 hour

      minutes = absFloor(seconds / 60);
      hours = absFloor(minutes / 60);
      seconds %= 60;
      minutes %= 60; // 12 months -> 1 year

      years = absFloor(months / 12);
      months %= 12; // inspired by https://github.com/dordille/moment-isoduration/blob/master/moment.isoduration.js

      var Y = years;
      var M = months;
      var D = days;
      var h = hours;
      var m = minutes;
      var s = seconds ? seconds.toFixed(3).replace(/\.?0+$/, '') : '';
      var total = this.asSeconds();

      if (!total) {
        // this is the same as C#'s (Noda) and python (isodate)...
        // but not other JS (goog.date)
        return 'P0D';
      }

      var totalSign = total < 0 ? '-' : '';
      var ymSign = sign(this._months) !== sign(total) ? '-' : '';
      var daysSign = sign(this._days) !== sign(total) ? '-' : '';
      var hmsSign = sign(this._milliseconds) !== sign(total) ? '-' : '';
      return totalSign + 'P' + (Y ? ymSign + Y + 'Y' : '') + (M ? ymSign + M + 'M' : '') + (D ? daysSign + D + 'D' : '') + (h || m || s ? 'T' : '') + (h ? hmsSign + h + 'H' : '') + (m ? hmsSign + m + 'M' : '') + (s ? hmsSign + s + 'S' : '');
    }

    var proto$2 = Duration.prototype;
    proto$2.isValid = isValid$1;
    proto$2.abs = abs;
    proto$2.add = add$1;
    proto$2.subtract = subtract$1;
    proto$2.as = as;
    proto$2.asMilliseconds = asMilliseconds;
    proto$2.asSeconds = asSeconds;
    proto$2.asMinutes = asMinutes;
    proto$2.asHours = asHours;
    proto$2.asDays = asDays;
    proto$2.asWeeks = asWeeks;
    proto$2.asMonths = asMonths;
    proto$2.asQuarters = asQuarters;
    proto$2.asYears = asYears;
    proto$2.valueOf = valueOf$1;
    proto$2._bubble = bubble;
    proto$2.clone = clone$1;
    proto$2.get = get$2;
    proto$2.milliseconds = milliseconds;
    proto$2.seconds = seconds;
    proto$2.minutes = minutes;
    proto$2.hours = hours;
    proto$2.days = days;
    proto$2.weeks = weeks;
    proto$2.months = months;
    proto$2.years = years;
    proto$2.humanize = humanize;
    proto$2.toISOString = toISOString$1;
    proto$2.toString = toISOString$1;
    proto$2.toJSON = toISOString$1;
    proto$2.locale = locale;
    proto$2.localeData = localeData;
    proto$2.toIsoString = deprecate('toIsoString() is deprecated. Please use toISOString() instead (notice the capitals)', toISOString$1);
    proto$2.lang = lang; // Side effect imports
    // FORMATTING

    addFormatToken('X', 0, 0, 'unix');
    addFormatToken('x', 0, 0, 'valueOf'); // PARSING

    addRegexToken('x', matchSigned);
    addRegexToken('X', matchTimestamp);
    addParseToken('X', function (input, array, config) {
      config._d = new Date(parseFloat(input, 10) * 1000);
    });
    addParseToken('x', function (input, array, config) {
      config._d = new Date(toInt(input));
    }); // Side effect imports

    hooks.version = '2.24.0';
    setHookCallback(createLocal);
    hooks.fn = proto;
    hooks.min = min;
    hooks.max = max;
    hooks.now = now;
    hooks.utc = createUTC;
    hooks.unix = createUnix;
    hooks.months = listMonths;
    hooks.isDate = isDate;
    hooks.locale = getSetGlobalLocale;
    hooks.invalid = createInvalid;
    hooks.duration = createDuration;
    hooks.isMoment = isMoment;
    hooks.weekdays = listWeekdays;
    hooks.parseZone = createInZone;
    hooks.localeData = getLocale;
    hooks.isDuration = isDuration;
    hooks.monthsShort = listMonthsShort;
    hooks.weekdaysMin = listWeekdaysMin;
    hooks.defineLocale = defineLocale;
    hooks.updateLocale = updateLocale;
    hooks.locales = listLocales;
    hooks.weekdaysShort = listWeekdaysShort;
    hooks.normalizeUnits = normalizeUnits;
    hooks.relativeTimeRounding = getSetRelativeTimeRounding;
    hooks.relativeTimeThreshold = getSetRelativeTimeThreshold;
    hooks.calendarFormat = getCalendarFormat;
    hooks.prototype = proto; // currently HTML5 input type only supports 24-hour formats

    hooks.HTML5_FMT = {
      DATETIME_LOCAL: 'YYYY-MM-DDTHH:mm',
      // <input type="datetime-local" />
      DATETIME_LOCAL_SECONDS: 'YYYY-MM-DDTHH:mm:ss',
      // <input type="datetime-local" step="1" />
      DATETIME_LOCAL_MS: 'YYYY-MM-DDTHH:mm:ss.SSS',
      // <input type="datetime-local" step="0.001" />
      DATE: 'YYYY-MM-DD',
      // <input type="date" />
      TIME: 'HH:mm',
      // <input type="time" />
      TIME_SECONDS: 'HH:mm:ss',
      // <input type="time" step="1" />
      TIME_MS: 'HH:mm:ss.SSS',
      // <input type="time" step="0.001" />
      WEEK: 'GGGG-[W]WW',
      // <input type="week" />
      MONTH: 'YYYY-MM' // <input type="month" />

    };
    return hooks;
  });
}); // Maps for number <-> hex string conversion

var byteToHex$2$1 = [];

for (var i$2$1 = 0; i$2$1 < 256; i$2$1++) {
  byteToHex$2$1[i$2$1] = (i$2$1 + 0x100).toString(16).substr(1);
}
/**
 * Generate 16 random bytes to be used as a base for UUID.
 *
 * @ignore
 */


var random$1$1 = function () {
  if (typeof crypto !== 'undefined' && crypto.getRandomValues) {
    // WHATWG crypto-based RNG - http://wiki.whatwg.org/wiki/Crypto
    // Moderately fast, high quality
    var _rnds8 = new Uint8Array(16);

    return function whatwgRNG() {
      crypto.getRandomValues(_rnds8);
      return _rnds8;
    };
  } // Math.random()-based (RNG)
  //
  // If all else fails, use Math.random().
  // It's fast, but is of unspecified quality.


  var _rnds = new Array(16);

  return function () {
    for (var i = 0, r; i < 16; i++) {
      if ((i & 0x03) === 0) {
        r = Math.random() * 0x100000000;
      }

      _rnds[i] = r >>> ((i & 0x03) << 3) & 0xff;
    }

    return _rnds;
  }; //     uuid.js
  //
  //     Copyright (c) 2010-2012 Robert Kieffer
  //     MIT License - http://opensource.org/licenses/mit-license.php
  // Unique ID creation requires a high quality random # generator.  We feature
  // detect to determine the best RNG source, normalizing to a function that
  // returns 128-bits of randomness, since that's what's usually required
  // return require('./rng');
}();

var byteToHex$1$1$1 = [];

for (var i$1$1$1 = 0; i$1$1$1 < 256; i$1$1$1++) {
  byteToHex$1$1$1[i$1$1$1] = (i$1$1$1 + 0x100).toString(16).substr(1);
} // **`v1()` - Generate time-based UUID**
//
// Inspired by https://github.com/LiosK/UUID.js
// and http://docs.python.org/library/uuid.html
// random #'s we need to init node and clockseq


var seedBytes$1$1 = random$1$1(); // Per 4.5, create and 48-bit node id, (47 random bits + multicast bit = 1)

var defaultNodeId$1$1 = [seedBytes$1$1[0] | 0x01, seedBytes$1$1[1], seedBytes$1$1[2], seedBytes$1$1[3], seedBytes$1$1[4], seedBytes$1$1[5]]; // Per 4.2.2, randomize (14 bit) clockseq

var defaultClockseq$1$1 = (seedBytes$1$1[6] << 8 | seedBytes$1$1[7]) & 0x3fff; // Previous uuid creation time
// for example '/Date(1198908717056)/' or '/Date(1198908717056-0700)/'
// code from http://momentjs.com/

var ASPDateRegex$1 = /^\/?Date\((-?\d+)/i; // Hex color

/**
 * Hue, Saturation, Value.
 */

/**
 * Test whether given object is a number
 *
 * @param value - Input value of unknown type.
 *
 * @returns True if number, false otherwise.
 */

function isNumber$1(value) {
  return value instanceof Number || typeof value === 'number';
}
/**
 * Test whether given object is a string
 *
 * @param value - Input value of unknown type.
 *
 * @returns True if string, false otherwise.
 */


function isString$1(value) {
  return value instanceof String || typeof value === 'string';
}
/**
 * Test whether given object is a Moment date.
 * @TODO: This is basically a workaround, if Moment was imported property it wouldn't necessary as moment.isMoment is a TS type guard.
 *
 * @param value - Input value of unknown type.
 *
 * @returns True if Moment instance, false otherwise.
 */


function isMoment$1(value) {
  return moment$1.isMoment(value);
}
/**
 * Convert an object into another type
 *
 * @param object - Value of unknown type.
 * @param type - Name of the desired type.
 *
 * @returns Object in the desired type.
 * @throws Error
 */


function convert$1(object, type) {
  var match;

  if (object === undefined) {
    return undefined;
  }

  if (object === null) {
    return null;
  }

  if (!type) {
    return object;
  }

  if (!(typeof type === 'string') && !(type instanceof String)) {
    throw new Error('Type must be a string');
  } //noinspection FallthroughInSwitchStatementJS


  switch (type) {
    case 'boolean':
    case 'Boolean':
      return Boolean(object);

    case 'number':
    case 'Number':
      if (isString$1(object) && !isNaN(Date.parse(object))) {
        return moment$1(object).valueOf();
      } else {
        // @TODO: I don't think that Number and String constructors are a good idea.
        // This could also fail if the object doesn't have valueOf method or if it's redefined.
        // For example: Object.create(null) or { valueOf: 7 }.
        return Number(object.valueOf());
      }

    case 'string':
    case 'String':
      return String(object);

    case 'Date':
      if (isNumber$1(object)) {
        return new Date(object);
      }

      if (object instanceof Date) {
        return new Date(object.valueOf());
      } else if (isMoment$1(object)) {
        return new Date(object.valueOf());
      }

      if (isString$1(object)) {
        match = ASPDateRegex$1.exec(object);

        if (match) {
          // object is an ASP date
          return new Date(Number(match[1])); // parse number
        } else {
          return moment$1(new Date(object)).toDate(); // parse string
        }
      } else {
        throw new Error('Cannot convert object of type ' + getType$1(object) + ' to type Date');
      }

    case 'Moment':
      if (isNumber$1(object)) {
        return moment$1(object);
      }

      if (object instanceof Date) {
        return moment$1(object.valueOf());
      } else if (isMoment$1(object)) {
        return moment$1(object);
      }

      if (isString$1(object)) {
        match = ASPDateRegex$1.exec(object);

        if (match) {
          // object is an ASP date
          return moment$1(Number(match[1])); // parse number
        } else {
          return moment$1(object); // parse string
        }
      } else {
        throw new Error('Cannot convert object of type ' + getType$1(object) + ' to type Date');
      }

    case 'ISODate':
      if (isNumber$1(object)) {
        return new Date(object);
      } else if (object instanceof Date) {
        return object.toISOString();
      } else if (isMoment$1(object)) {
        return object.toDate().toISOString();
      } else if (isString$1(object)) {
        match = ASPDateRegex$1.exec(object);

        if (match) {
          // object is an ASP date
          return new Date(Number(match[1])).toISOString(); // parse number
        } else {
          return moment$1(object).format(); // ISO 8601
        }
      } else {
        throw new Error('Cannot convert object of type ' + getType$1(object) + ' to type ISODate');
      }

    case 'ASPDate':
      if (isNumber$1(object)) {
        return '/Date(' + object + ')/';
      } else if (object instanceof Date) {
        return '/Date(' + object.valueOf() + ')/';
      } else if (isString$1(object)) {
        match = ASPDateRegex$1.exec(object);

        var _value;

        if (match) {
          // object is an ASP date
          _value = new Date(Number(match[1])).valueOf(); // parse number
        } else {
          _value = new Date(object).valueOf(); // parse string
        }

        return '/Date(' + _value + ')/';
      } else {
        throw new Error('Cannot convert object of type ' + getType$1(object) + ' to type ASPDate');
      }

    default:
      var never = type;
      throw new Error("Unknown type ".concat(never));
  }
}
/**
 * Get the type of an object, for example exports.getType([]) returns 'Array'
 *
 * @param object - Input value of unknown type.
 *
 * @returns Detected type.
 */


function getType$1(object) {
  var type = _typeof(object);

  if (type === 'object') {
    if (object === null) {
      return 'null';
    }

    if (object instanceof Boolean) {
      return 'Boolean';
    }

    if (object instanceof Number) {
      return 'Number';
    }

    if (object instanceof String) {
      return 'String';
    }

    if (Array.isArray(object)) {
      return 'Array';
    }

    if (object instanceof Date) {
      return 'Date';
    }

    return 'Object';
  }

  if (type === 'number') {
    return 'Number';
  }

  if (type === 'boolean') {
    return 'Boolean';
  }

  if (type === 'string') {
    return 'String';
  }

  if (type === undefined) {
    return 'undefined';
  }

  return type;
}
/**
 * Determine whether a value can be used as an id.
 *
 * @param value - Input value of unknown type.
 *
 * @returns True if the value is valid id, false otherwise.
 */


function isId(value) {
  return typeof value === 'string' || typeof value === 'number';
}
/**
 * A queue.
 *
 * @typeParam T - The type of method names to be replaced by queued versions.
 */


var Queue =
/*#__PURE__*/
function () {
  /**
   * Construct a new Queue.
   *
   * @param options - Queue configuration.
   */
  function Queue(options) {
    classCallCheck(this, Queue);
    this._queue = [];
    this._timeout = null;
    this._extended = null; // options

    this.delay = null;
    this.max = Infinity;
    this.setOptions(options);
  }
  /**
   * Update the configuration of the queue.
   *
   * @param options - Queue configuration.
   */


  createClass(Queue, [{
    key: "setOptions",
    value: function setOptions(options) {
      if (options && typeof options.delay !== 'undefined') {
        this.delay = options.delay;
      }

      if (options && typeof options.max !== 'undefined') {
        this.max = options.max;
      }

      this._flushIfNeeded();
    }
    /**
     * Extend an object with queuing functionality.
     * The object will be extended with a function flush, and the methods provided in options.replace will be replaced with queued ones.
     *
     * @param object - The object to be extended.
     * @param options - Additional options.
     *
     * @returns The created queue.
     */

  }, {
    key: "destroy",

    /**
     * Destroy the queue. The queue will first flush all queued actions, and in case it has extended an object, will restore the original object.
     */
    value: function destroy() {
      this.flush();

      if (this._extended) {
        var object = this._extended.object;
        var methods = this._extended.methods;

        for (var i = 0; i < methods.length; i++) {
          var method = methods[i];

          if (method.original) {
            object[method.name] = method.original;
          } else {
            // @TODO: better solution?
            delete object[method.name];
          }
        }

        this._extended = null;
      }
    }
    /**
     * Replace a method on an object with a queued version.
     *
     * @param object - Object having the method.
     * @param method - The method name.
     */

  }, {
    key: "replace",
    value: function replace(object, method) {
      var me = this;
      var original = object[method];

      if (!original) {
        throw new Error('Method ' + method + ' undefined');
      }

      object[method] = function () {
        for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
          args[_key] = arguments[_key];
        } // add this call to the queue


        me.queue({
          args: args,
          fn: original,
          context: this
        });
      };
    }
    /**
     * Queue a call.
     *
     * @param entry - The function or entry to be queued.
     */

  }, {
    key: "queue",
    value: function queue(entry) {
      if (typeof entry === 'function') {
        this._queue.push({
          fn: entry
        });
      } else {
        this._queue.push(entry);
      }

      this._flushIfNeeded();
    }
    /**
     * Check whether the queue needs to be flushed.
     */

  }, {
    key: "_flushIfNeeded",
    value: function _flushIfNeeded() {
      var _this = this; // flush when the maximum is exceeded.


      if (this._queue.length > this.max) {
        this.flush();
      } // flush after a period of inactivity when a delay is configured


      if (this._timeout != null) {
        clearTimeout(this._timeout);
        this._timeout = null;
      }

      if (this.queue.length > 0 && typeof this.delay === 'number') {
        this._timeout = setTimeout(function () {
          _this.flush();
        }, this.delay);
      }
    }
    /**
     * Flush all queued calls
     */

  }, {
    key: "flush",
    value: function flush() {
      this._queue.splice(0).forEach(function (entry) {
        entry.fn.apply(entry.context || entry.fn, entry.args || []);
      });
    }
  }], [{
    key: "extend",
    value: function extend(object, options) {
      var queue = new Queue(options);

      if (object.flush !== undefined) {
        throw new Error('Target object already has a property flush');
      }

      object.flush = function () {
        queue.flush();
      };

      var methods = [{
        name: 'flush',
        original: undefined
      }];

      if (options && options.replace) {
        for (var i = 0; i < options.replace.length; i++) {
          var name = options.replace[i];
          methods.push({
            name: name,
            // @TODO: better solution?
            original: object[name]
          }); // @TODO: better solution?

          queue.replace(object, name);
        }
      }

      queue._extended = {
        object: object,
        methods: methods
      };
      return queue;
    }
  }]);
  return Queue;
}();

function _arrayWithoutHoles$1(arr) {
  if (Array.isArray(arr)) {
    for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) {
      arr2[i] = arr[i];
    }

    return arr2;
  }
}

var arrayWithoutHoles$1 = _arrayWithoutHoles$1;

function _iterableToArray$1(iter) {
  if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === "[object Arguments]") return Array.from(iter);
}

var iterableToArray$1 = _iterableToArray$1;

function _nonIterableSpread$1() {
  throw new TypeError("Invalid attempt to spread non-iterable instance");
}

var nonIterableSpread$1 = _nonIterableSpread$1;

function _toConsumableArray$1(arr) {
  return arrayWithoutHoles$1(arr) || iterableToArray$1(arr) || nonIterableSpread$1();
}

var toConsumableArray$1 = _toConsumableArray$1;
/**
 * [[DataSet]] code that can be reused in [[DataView]] or other similar implementations of [[DataInterface]].
 *
 * @typeParam Item - Item type that may or may not have an id.
 * @typeParam IdProp - Name of the property that contains the id.
 */

var DataSetPart =
/*#__PURE__*/
function () {
  function DataSetPart() {
    classCallCheck(this, DataSetPart);
    this._subscribers = {
      '*': [],
      add: [],
      remove: [],
      update: []
    };
    /**
     * @deprecated Use on instead (PS: DataView.subscribe === DataView.on).
     */

    this.subscribe = DataSetPart.prototype.on;
    /**
     * @deprecated Use off instead (PS: DataView.unsubscribe === DataView.off).
     */

    this.unsubscribe = DataSetPart.prototype.off;
  }
  /**
   * Trigger an event
   *
   * @param event - Event name.
   * @param payload - Event payload.
   * @param senderId - Id of the sender.
   */


  createClass(DataSetPart, [{
    key: "_trigger",
    value: function _trigger(event, payload, senderId) {
      if (event === '*') {
        throw new Error('Cannot trigger event *');
      }

      var subscribers = [].concat(toConsumableArray$1(this._subscribers[event]), toConsumableArray$1(this._subscribers['*']));

      for (var i = 0, len = subscribers.length; i < len; i++) {
        var subscriber = subscribers[i];

        if (subscriber.callback) {
          subscriber.callback(event, payload, senderId != null ? senderId : null);
        }
      }
    }
    /**
     * Subscribe to an event, add an event listener.
     *
     * @param event - Event name.
     * @param callback - Callback method.
     */

  }, {
    key: "on",
    value: function on(event, callback) {
      this._subscribers[event].push({
        callback: callback
      });
    }
    /**
     * Unsubscribe from an event, remove an event listener.
     *
     * @remarks If the same callback was subscribed more than once **all** occurences will be removed.
     *
     * @param event - Event name.
     * @param callback - Callback method.
     */

  }, {
    key: "off",
    value: function off(event, callback) {
      this._subscribers[event] = this._subscribers[event].filter(function (listener) {
        return listener.callback !== callback;
      });
    }
  }]);
  return DataSetPart;
}();

function ownKeys$1(object, enumerableOnly) {
  var keys = Object.keys(object);

  if (Object.getOwnPropertySymbols) {
    keys.push.apply(keys, Object.getOwnPropertySymbols(object));
  }

  if (enumerableOnly) keys = keys.filter(function (sym) {
    return Object.getOwnPropertyDescriptor(object, sym).enumerable;
  });
  return keys;
}

function _objectSpread$1(target) {
  for (var i = 1; i < arguments.length; i++) {
    var source = arguments[i] != null ? arguments[i] : {};

    if (i % 2) {
      ownKeys$1(source, true).forEach(function (key) {
        defineProperty$1(target, key, source[key]);
      });
    } else if (Object.getOwnPropertyDescriptors) {
      Object.defineProperties(target, Object.getOwnPropertyDescriptors(source));
    } else {
      ownKeys$1(source).forEach(function (key) {
        Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
      });
    }
  }

  return target;
}
/**
 * # DataSet
 *
 * Vis.js comes with a flexible DataSet, which can be used to hold and manipulate unstructured data and listen for changes in the data. The DataSet is key/value based. Data items can be added, updated and removed from the DataSet, and one can subscribe to changes in the DataSet. The data in the DataSet can be filtered and ordered, and fields (like dates) can be converted to a specific type. Data can be normalized when appending it to the DataSet as well.
 *
 * ## Example
 *
 * The following example shows how to use a DataSet.
 *
 * ```javascript
 * // create a DataSet
 * var options = {};
 * var data = new vis.DataSet(options);
 *
 * // add items
 * // note that the data items can contain different properties and data formats
 * data.add([
 *   {id: 1, text: 'item 1', date: new Date(2013, 6, 20), group: 1, first: true},
 *   {id: 2, text: 'item 2', date: '2013-06-23', group: 2},
 *   {id: 3, text: 'item 3', date: '2013-06-25', group: 2},
 *   {id: 4, text: 'item 4'}
 * ]);
 *
 * // subscribe to any change in the DataSet
 * data.on('*', function (event, properties, senderId) {
 *   console.log('event', event, properties);
 * });
 *
 * // update an existing item
 * data.update({id: 2, group: 1});
 *
 * // remove an item
 * data.remove(4);
 *
 * // get all ids
 * var ids = data.getIds();
 * console.log('ids', ids);
 *
 * // get a specific item
 * var item1 = data.get(1);
 * console.log('item1', item1);
 *
 * // retrieve a filtered subset of the data
 * var items = data.get({
 *   filter: function (item) {
 *     return item.group == 1;
 *   }
 * });
 * console.log('filtered items', items);
 *
 * // retrieve formatted items
 * var items = data.get({
 *   fields: ['id', 'date'],
 *   type: {
 *     date: 'ISODate'
 *   }
 * });
 * console.log('formatted items', items);
 * ```
 *
 * @typeParam Item - Item type that may or may not have an id.
 * @typeParam IdProp - Name of the property that contains the id.
 */


var DataSet =
/*#__PURE__*/
function (_DataSetPart) {
  inherits(DataSet, _DataSetPart);
  /**
   * Construct a new DataSet.
   *
   * @param data - Initial data or options.
   * @param options - Options (type error if data is also options).
   */

  function DataSet(data, options) {
    var _this;

    classCallCheck(this, DataSet);
    _this = possibleConstructorReturn(this, getPrototypeOf(DataSet).call(this)); // correctly read optional arguments

    if (data && !Array.isArray(data)) {
      options = data;
      data = [];
    }

    _this._options = options || {};
    _this._data = Object.create({}); // map with data indexed by id

    _this.length = 0; // number of items in the DataSet

    _this._idProp = _this._options.fieldId || 'id'; // name of the field containing id

    _this._type = {}; // internal field types (NOTE: this can differ from this._options.type)
    // all variants of a Date are internally stored as Date, so we can convert
    // from everything to everything (also from ISODate to Number for example)

    if (_this._options.type) {
      var fields = Object.keys(_this._options.type);

      for (var i = 0, len = fields.length; i < len; i++) {
        var field = fields[i];
        var value = _this._options.type[field];

        if (value == 'Date' || value == 'ISODate' || value == 'ASPDate') {
          _this._type[field] = 'Date';
        } else {
          _this._type[field] = value;
        }
      }
    } // add initial data when provided


    if (data && data.length) {
      _this.add(data);
    }

    _this.setOptions(options);

    return _this;
  }
  /**
   * Set new options.
   *
   * @param options - The new options.
   */


  createClass(DataSet, [{
    key: "setOptions",
    value: function setOptions(options) {
      if (options && options.queue !== undefined) {
        if (options.queue === false) {
          // delete queue if loaded
          if (this._queue) {
            this._queue.destroy();

            delete this._queue;
          }
        } else {
          // create queue and update its options
          if (!this._queue) {
            this._queue = Queue.extend(this, {
              replace: ['add', 'update', 'remove']
            });
          }

          if (options.queue && _typeof_1$1(options.queue) === 'object') {
            this._queue.setOptions(options.queue);
          }
        }
      }
    }
    /**
     * Add a data item or an array with items.
     *
     * After the items are added to the DataSet, the DataSet will trigger an event `add`. When a `senderId` is provided, this id will be passed with the triggered event to all subscribers.
     *
     * ## Example
     *
     * ```javascript
     * // create a DataSet
     * const data = new vis.DataSet()
     *
     * // add items
     * const ids = data.add([
     *   { id: 1, text: 'item 1' },
     *   { id: 2, text: 'item 2' },
     *   { text: 'item without an id' }
     * ])
     *
     * console.log(ids) // [1, 2, '<UUIDv4>']
     * ```
     *
     * @param data - Items to be added (ids will be generated if missing).
     * @param senderId - Sender id.
     *
     * @returns addedIds - Array with the ids (generated if not present) of the added items.
     *
     * @throws When an item with the same id as any of the added items already exists.
     */

  }, {
    key: "add",
    value: function add(data, senderId) {
      var addedIds = [];
      var id;

      if (Array.isArray(data)) {
        // Array
        for (var i = 0, len = data.length; i < len; i++) {
          id = this._addItem(data[i]);
          addedIds.push(id);
        }
      } else if (data && _typeof_1$1(data) === 'object') {
        // Single item
        id = this._addItem(data);
        addedIds.push(id);
      } else {
        throw new Error('Unknown dataType');
      }

      if (addedIds.length) {
        this._trigger('add', {
          items: addedIds
        }, senderId);
      }

      return addedIds;
    }
    /**
     * Update existing items. When an item does not exist, it will be created
     *
     * The provided properties will be merged in the existing item. When an item does not exist, it will be created.
     *
     * After the items are updated, the DataSet will trigger an event `add` for the added items, and an event `update`. When a `senderId` is provided, this id will be passed with the triggered event to all subscribers.
     *
     * ## Example
     *
     * ```javascript
     * // create a DataSet
     * const data = new vis.DataSet([
     *   { id: 1, text: 'item 1' },
     *   { id: 2, text: 'item 2' },
     *   { id: 3, text: 'item 3' }
     * ])
     *
     * // update items
     * const ids = data.update([
     *   { id: 2, text: 'item 2 (updated)' },
     *   { id: 4, text: 'item 4 (new)' }
     * ])
     *
     * console.log(ids) // [2, 4]
     * ```
     *
     * @param data - Items to be updated (if the id is already present) or added (if the id is missing).
     * @param senderId - Sender id.
     *
     * @returns updatedIds - The ids of the added (these may be newly generated if there was no id in the item from the data) or updated items.
     *
     * @throws When the supplied data is neither an item nor an array of items.
     */

  }, {
    key: "update",
    value: function update(data, senderId) {
      var _this2 = this;

      var addedIds = [];
      var updatedIds = [];
      var oldData = [];
      var updatedData = [];
      var idProp = this._idProp;

      var addOrUpdate = function addOrUpdate(item) {
        var origId = item[idProp];

        if (origId != null && _this2._data[origId]) {
          var fullItem = item; // it has an id, therefore it is a fullitem

          var oldItem = Object.assign({}, _this2._data[origId]); // update item

          var id = _this2._updateItem(fullItem);

          updatedIds.push(id);
          updatedData.push(fullItem);
          oldData.push(oldItem);
        } else {
          // add new item
          var _id = _this2._addItem(item);

          addedIds.push(_id);
        }
      };

      if (Array.isArray(data)) {
        // Array
        for (var i = 0, len = data.length; i < len; i++) {
          if (data[i] && _typeof_1$1(data[i]) === 'object') {
            addOrUpdate(data[i]);
          } else {
            console.warn('Ignoring input item, which is not an object at index ' + i);
          }
        }
      } else if (data && _typeof_1$1(data) === 'object') {
        // Single item
        addOrUpdate(data);
      } else {
        throw new Error('Unknown dataType');
      }

      if (addedIds.length) {
        this._trigger('add', {
          items: addedIds
        }, senderId);
      }

      if (updatedIds.length) {
        var props = {
          items: updatedIds,
          oldData: oldData,
          data: updatedData
        }; // TODO: remove deprecated property 'data' some day
        //Object.defineProperty(props, 'data', {
        //  'get': (function() {
        //    console.warn('Property data is deprecated. Use DataSet.get(ids) to retrieve the new data, use the oldData property on this object to get the old data');
        //    return updatedData;
        //  }).bind(this)
        //});

        this._trigger('update', props, senderId);
      }

      return addedIds.concat(updatedIds);
    }
    /** @inheritdoc */

  }, {
    key: "get",
    value: function get(first, second) {
      // @TODO: Woudn't it be better to split this into multiple methods?
      // parse the arguments
      var id = undefined;
      var ids = undefined;
      var options = undefined;

      if (isId(first)) {
        // get(id [, options])
        id = first;
        options = second;
      } else if (Array.isArray(first)) {
        // get(ids [, options])
        ids = first;
        options = second;
      } else {
        // get([, options])
        options = first;
      } // determine the return type


      var returnType = options && options.returnType === 'Object' ? 'Object' : 'Array'; // @TODO: WTF is this? Or am I missing something?
      // var returnType
      // if (options && options.returnType) {
      //   var allowedValues = ['Array', 'Object']
      //   returnType =
      //     allowedValues.indexOf(options.returnType) == -1
      //       ? 'Array'
      //       : options.returnType
      // } else {
      //   returnType = 'Array'
      // }
      // build options

      var type = options && options.type || this._options.type;
      var filter = options && options.filter;
      var items = [];
      var item = null;
      var itemIds = null;
      var itemId = null; // convert items

      if (id != null) {
        // return a single item
        item = this._getItem(id, type);

        if (item && filter && !filter(item)) {
          item = null;
        }
      } else if (ids != null) {
        // return a subset of items
        for (var i = 0, len = ids.length; i < len; i++) {
          item = this._getItem(ids[i], type);

          if (item != null && (!filter || filter(item))) {
            items.push(item);
          }
        }
      } else {
        // return all items
        itemIds = Object.keys(this._data);

        for (var _i = 0, _len = itemIds.length; _i < _len; _i++) {
          itemId = itemIds[_i];
          item = this._getItem(itemId, type);

          if (item != null && (!filter || filter(item))) {
            items.push(item);
          }
        }
      } // order the results


      if (options && options.order && id == undefined) {
        this._sort(items, options.order);
      } // filter fields of the items


      if (options && options.fields) {
        var fields = options.fields;

        if (id != undefined && item != null) {
          item = this._filterFields(item, fields);
        } else {
          for (var _i2 = 0, _len2 = items.length; _i2 < _len2; _i2++) {
            items[_i2] = this._filterFields(items[_i2], fields);
          }
        }
      } // return the results


      if (returnType == 'Object') {
        var result = {};

        for (var _i3 = 0, _len3 = items.length; _i3 < _len3; _i3++) {
          var resultant = items[_i3]; // @TODO: Shoudn't this be this._fieldId?
          // result[resultant.id] = resultant

          var _id2 = resultant[this._idProp];
          result[_id2] = resultant;
        }

        return result;
      } else {
        if (id != null) {
          // a single item
          return item;
        } else {
          // just return our array
          return items;
        }
      }
    }
    /** @inheritdoc */

  }, {
    key: "getIds",
    value: function getIds(options) {
      var data = this._data;
      var filter = options && options.filter;
      var order = options && options.order;
      var type = options && options.type || this._options.type;
      var itemIds = Object.keys(data);
      var ids = [];
      var item;
      var items;

      if (filter) {
        // get filtered items
        if (order) {
          // create ordered list
          items = [];

          for (var i = 0, len = itemIds.length; i < len; i++) {
            var id = itemIds[i];
            item = this._getItem(id, type);

            if (filter(item)) {
              items.push(item);
            }
          }

          this._sort(items, order);

          for (var _i4 = 0, _len4 = items.length; _i4 < _len4; _i4++) {
            ids.push(items[_i4][this._idProp]);
          }
        } else {
          // create unordered list
          for (var _i5 = 0, _len5 = itemIds.length; _i5 < _len5; _i5++) {
            var _id3 = itemIds[_i5];
            item = this._getItem(_id3, type);

            if (filter(item)) {
              ids.push(item[this._idProp]);
            }
          }
        }
      } else {
        // get all items
        if (order) {
          // create an ordered list
          items = [];

          for (var _i6 = 0, _len6 = itemIds.length; _i6 < _len6; _i6++) {
            var _id4 = itemIds[_i6];
            items.push(data[_id4]);
          }

          this._sort(items, order);

          for (var _i7 = 0, _len7 = items.length; _i7 < _len7; _i7++) {
            ids.push(items[_i7][this._idProp]);
          }
        } else {
          // create unordered list
          for (var _i8 = 0, _len8 = itemIds.length; _i8 < _len8; _i8++) {
            var _id5 = itemIds[_i8];
            item = data[_id5];
            ids.push(item[this._idProp]);
          }
        }
      }

      return ids;
    }
    /** @inheritdoc */

  }, {
    key: "getDataSet",
    value: function getDataSet() {
      return this;
    }
    /** @inheritdoc */

  }, {
    key: "forEach",
    value: function forEach(callback, options) {
      var filter = options && options.filter;
      var type = options && options.type || this._options.type;
      var data = this._data;
      var itemIds = Object.keys(data);

      if (options && options.order) {
        // execute forEach on ordered list
        var items = this.get(options);

        for (var i = 0, len = items.length; i < len; i++) {
          var item = items[i];
          var id = item[this._idProp];
          callback(item, id);
        }
      } else {
        // unordered
        for (var _i9 = 0, _len9 = itemIds.length; _i9 < _len9; _i9++) {
          var _id6 = itemIds[_i9];

          var _item = this._getItem(_id6, type);

          if (!filter || filter(_item)) {
            callback(_item, _id6);
          }
        }
      }
    }
    /** @inheritdoc */

  }, {
    key: "map",
    value: function map(callback, options) {
      var filter = options && options.filter;
      var type = options && options.type || this._options.type;
      var mappedItems = [];
      var data = this._data;
      var itemIds = Object.keys(data); // convert and filter items

      for (var i = 0, len = itemIds.length; i < len; i++) {
        var id = itemIds[i];

        var item = this._getItem(id, type);

        if (!filter || filter(item)) {
          mappedItems.push(callback(item, id));
        }
      } // order items


      if (options && options.order) {
        this._sort(mappedItems, options.order);
      }

      return mappedItems;
    }
    /**
     * Filter the fields of an item.
     *
     * @param item - The item whose fields should be filtered.
     * @param fields - The names of the fields that will be kept.
     *
     * @typeParam K - Field name type.
     *
     * @returns The item without any additional fields.
     */

  }, {
    key: "_filterFields",
    value: function _filterFields(item, fields) {
      if (!item) {
        // item is null
        return item;
      }

      return (Array.isArray(fields) ? // Use the supplied array
      fields : // Use the keys of the supplied object
      Object.keys(fields)).reduce(function (filteredItem, field) {
        filteredItem[field] = item[field];
        return filteredItem;
      }, {});
    }
    /**
     * Sort the provided array with items.
     *
     * @param items - Items to be sorted in place.
     * @param order - A field name or custom sort function.
     *
     * @typeParam T - The type of the items in the items array.
     */

  }, {
    key: "_sort",
    value: function _sort(items, order) {
      if (typeof order === 'string') {
        // order by provided field name
        var name = order; // field name

        items.sort(function (a, b) {
          // @TODO: How to treat missing properties?
          var av = a[name];
          var bv = b[name];
          return av > bv ? 1 : av < bv ? -1 : 0;
        });
      } else if (typeof order === 'function') {
        // order by sort function
        items.sort(order);
      } else {
        // TODO: extend order by an Object {field:string, direction:string}
        //       where direction can be 'asc' or 'desc'
        throw new TypeError('Order must be a function or a string');
      }
    }
    /**
     * Remove an item or multiple items by “reference” (only the id is used) or by id.
     *
     * The method ignores removal of non-existing items, and returns an array containing the ids of the items which are actually removed from the DataSet.
     *
     * After the items are removed, the DataSet will trigger an event `remove` for the removed items. When a `senderId` is provided, this id will be passed with the triggered event to all subscribers.
     *
     * ## Example
     * ```javascript
     * // create a DataSet
     * const data = new vis.DataSet([
     *   { id: 1, text: 'item 1' },
     *   { id: 2, text: 'item 2' },
     *   { id: 3, text: 'item 3' }
     * ])
     *
     * // remove items
     * const ids = data.remove([2, { id: 3 }, 4])
     *
     * console.log(ids) // [2, 3]
     * ```
     *
     * @param id - One or more items or ids of items to be removed.
     * @param senderId - Sender id.
     *
     * @returns The ids of the removed items.
     */

  }, {
    key: "remove",
    value: function remove(id, senderId) {
      var removedIds = [];
      var removedItems = []; // force everything to be an array for simplicity

      var ids = Array.isArray(id) ? id : [id];

      for (var i = 0, len = ids.length; i < len; i++) {
        var item = this._remove(ids[i]);

        if (item) {
          var itemId = item[this._idProp];

          if (itemId != null) {
            removedIds.push(itemId);
            removedItems.push(item);
          }
        }
      }

      if (removedIds.length) {
        this._trigger('remove', {
          items: removedIds,
          oldData: removedItems
        }, senderId);
      }

      return removedIds;
    }
    /**
     * Remove an item by its id or reference.
     *
     * @param id - Id of an item or the item itself.
     *
     * @returns The removed item if removed, null otherwise.
     */

  }, {
    key: "_remove",
    value: function _remove(id) {
      // @TODO: It origianlly returned the item although the docs say id.
      // The code expects the item, so probably an error in the docs.
      var ident; // confirm the id to use based on the args type

      if (isId(id)) {
        ident = id;
      } else if (id && _typeof_1$1(id) === 'object') {
        ident = id[this._idProp]; // look for the identifier field using ._idProp
      } // do the removing if the item is found


      if (ident != null && this._data[ident]) {
        var item = this._data[ident];
        delete this._data[ident];
        --this.length;
        return item;
      }

      return null;
    }
    /**
     * Clear the entire data set.
     *
     * After the items are removed, the [[DataSet]] will trigger an event `remove` for all removed items. When a `senderId` is provided, this id will be passed with the triggered event to all subscribers.
     *
     * @param senderId - Sender id.
     *
     * @returns removedIds - The ids of all removed items.
     */

  }, {
    key: "clear",
    value: function clear(senderId) {
      var ids = Object.keys(this._data);
      var items = [];

      for (var i = 0, len = ids.length; i < len; i++) {
        items.push(this._data[ids[i]]);
      }

      this._data = {};
      this.length = 0;

      this._trigger('remove', {
        items: ids,
        oldData: items
      }, senderId);

      return ids;
    }
    /**
     * Find the item with maximum value of a specified field.
     *
     * @param field - Name of the property that should be searched for max value.
     *
     * @returns Item containing max value, or null if no items.
     */

  }, {
    key: "max",
    value: function max(field) {
      var data = this._data;
      var itemIds = Object.keys(data);
      var max = null;
      var maxField = null;

      for (var i = 0, len = itemIds.length; i < len; i++) {
        var id = itemIds[i];
        var item = data[id];
        var itemField = item[field];

        if (itemField != null && (maxField == null || itemField > maxField)) {
          max = item;
          maxField = itemField;
        }
      }

      return max;
    }
    /**
     * Find the item with minimum value of a specified field.
     *
     * @param field - Name of the property that should be searched for min value.
     *
     * @returns Item containing min value, or null if no items.
     */

  }, {
    key: "min",
    value: function min(field) {
      var data = this._data;
      var itemIds = Object.keys(data);
      var min = null;
      var minField = null;

      for (var i = 0, len = itemIds.length; i < len; i++) {
        var id = itemIds[i];
        var item = data[id];
        var itemField = item[field];

        if (itemField != null && (minField == null || itemField < minField)) {
          min = item;
          minField = itemField;
        }
      }

      return min;
    }
    /**
     * Find all distinct values of a specified field
     *
     * @param prop - The property name whose distinct values should be returned.
     *
     * @returns Unordered array containing all distinct values. Items without specified property are ignored.
     */

  }, {
    key: "distinct",
    value: function distinct(prop) {
      var data = this._data;
      var itemIds = Object.keys(data);
      var values = [];
      var fieldType = this._options.type && this._options.type[prop] || null;
      var count = 0;

      for (var i = 0, len = itemIds.length; i < len; i++) {
        var id = itemIds[i];
        var item = data[id];
        var value = item[prop];
        var exists = false;

        for (var j = 0; j < count; j++) {
          if (values[j] == value) {
            exists = true;
            break;
          }
        }

        if (!exists && value !== undefined) {
          values[count] = value;
          count++;
        }
      }

      if (fieldType) {
        for (var _i10 = 0, _len10 = values.length; _i10 < _len10; _i10++) {
          values[_i10] = convert$1(values[_i10], fieldType);
        }
      }

      return values;
    }
    /**
     * Add a single item. Will fail when an item with the same id already exists.
     *
     * @param item - A new item to be added.
     *
     * @returns Added item's id. An id is generated when it is not present in the item.
     */

  }, {
    key: "_addItem",
    value: function _addItem(item) {
      var id = item[this._idProp];

      if (id != null) {
        // check whether this id is already taken
        if (this._data[id]) {
          // item already exists
          throw new Error('Cannot add item: item with id ' + id + ' already exists');
        }
      } else {
        // generate an id
        id = uuid4$1();
        item[this._idProp] = id;
      }

      var d = {};
      var fields = Object.keys(item);

      for (var i = 0, len = fields.length; i < len; i++) {
        var field = fields[i];
        var fieldType = this._type[field]; // type may be undefined

        d[field] = convert$1(item[field], fieldType);
      }

      this._data[id] = d;
      this.length++;
      return id;
    }
    /**
     * Get an item. Fields can be converted to a specific type
     *
     * @param id - Id of the requested item.
     * @param types - Property name to type name object map of type converstions.
     *
     * @returns The item, optionally after type conversion.
     */

  }, {
    key: "_getItem",
    value: function _getItem(id, types) {
      // @TODO: I have no idea how to type this.
      // get the item from the dataset
      var raw = this._data[id];

      if (!raw) {
        return null;
      } // convert the items field types


      var converted;
      var fields = Object.keys(raw);

      if (types) {
        converted = {};

        for (var i = 0, len = fields.length; i < len; i++) {
          var field = fields[i];
          var value = raw[field];
          converted[field] = convert$1(value, types[field]);
        }
      } else {
        // no field types specified, no converting needed
        converted = _objectSpread$1({}, raw);
      }

      if (converted[this._idProp] == null) {
        converted[this._idProp] = raw.id;
      }

      return converted;
    }
    /**
     * Update a single item: merge with existing item.
     * Will fail when the item has no id, or when there does not exist an item with the same id.
     *
     * @param item - The new item
     *
     * @returns The id of the updated item.
     */

  }, {
    key: "_updateItem",
    value: function _updateItem(item) {
      var id = item[this._idProp];

      if (id == null) {
        throw new Error('Cannot update item: item has no id (item: ' + JSON.stringify(item) + ')');
      }

      var d = this._data[id];

      if (!d) {
        // item doesn't exist
        throw new Error('Cannot update item: no item with id ' + id + ' found');
      } // merge with current item


      var fields = Object.keys(item);

      for (var i = 0, len = fields.length; i < len; i++) {
        var field = fields[i];
        var fieldType = this._type[field] // type may be undefined
        ;
        d[field] = convert$1(item[field], fieldType);
      }

      return id;
    }
  }]);
  return DataSet;
}(DataSetPart);
/**
 * DataView
 *
 * A DataView offers a filtered and/or formatted view on a DataSet. One can subscribe to changes in a DataView, and easily get filtered or formatted data without having to specify filters and field types all the time.
 *
 * ## Example
 * ```javascript
 * // create a DataSet
 * var data = new vis.DataSet();
 * data.add([
 *   {id: 1, text: 'item 1', date: new Date(2013, 6, 20), group: 1, first: true},
 *   {id: 2, text: 'item 2', date: '2013-06-23', group: 2},
 *   {id: 3, text: 'item 3', date: '2013-06-25', group: 2},
 *   {id: 4, text: 'item 4'}
 * ]);
 *
 * // create a DataView
 * // the view will only contain items having a property group with value 1,
 * // and will only output fields id, text, and date.
 * var view = new vis.DataView(data, {
 *   filter: function (item) {
 *     return (item.group == 1);
 *   },
 *   fields: ['id', 'text', 'date']
 * });
 *
 * // subscribe to any change in the DataView
 * view.on('*', function (event, properties, senderId) {
 *   console.log('event', event, properties);
 * });
 *
 * // update an item in the data set
 * data.update({id: 2, group: 1});
 *
 * // get all ids in the view
 * var ids = view.getIds();
 * console.log('ids', ids); // will output [1, 2]
 *
 * // get all items in the view
 * var items = view.get();
 * ```
 *
 * @typeParam Item - Item type that may or may not have an id.
 * @typeParam IdProp - Name of the property that contains the id.
 */


var DataView =
/*#__PURE__*/
function (_DataSetPart) {
  inherits(DataView, _DataSetPart);
  /**
   * Create a DataView.
   *
   * @param data - The instance containing data (directly or indirectly).
   * @param options - Options to configure this data view.
   */

  function DataView(data, options) {
    var _this;

    classCallCheck(this, DataView);
    _this = possibleConstructorReturn(this, getPrototypeOf(DataView).call(this));
    /** @inheritdoc */

    _this.length = 0;
    _this._ids = {}; // ids of the items currently in memory (just contains a boolean true)

    _this._options = options || {};
    _this.listener = _this._onEvent.bind(assertThisInitialized(_this));

    _this.setData(data);

    return _this;
  } // TODO: implement a function .config() to dynamically update things like configured filter
  // and trigger changes accordingly

  /**
   * Set a data source for the view.
   *
   * @param data - The instance containing data (directly or indirectly).
   */


  createClass(DataView, [{
    key: "setData",
    value: function setData(data) {
      if (this._data) {
        // unsubscribe from current dataset
        if (this._data.off) {
          this._data.off('*', this.listener);
        } // trigger a remove of all items in memory


        var ids = this._data.getIds({
          filter: this._options.filter
        });

        var items = this._data.get(ids);

        this._ids = {};
        this.length = 0;

        this._trigger('remove', {
          items: ids,
          oldData: items
        });
      }

      if (data != null) {
        this._data = data; // trigger an add of all added items

        var _ids = this._data.getIds({
          filter: this._options.filter
        });

        for (var i = 0, len = _ids.length; i < len; i++) {
          var id = _ids[i];
          this._ids[id] = true;
        }

        this.length = _ids.length;

        this._trigger('add', {
          items: _ids
        });
      } else {
        this._data = new DataSet();
      } // subscribe to new dataset


      if (this._data.on) {
        this._data.on('*', this.listener);
      }
    }
    /**
     * Refresh the DataView.
     * Useful when the DataView has a filter function containing a variable parameter.
     */

  }, {
    key: "refresh",
    value: function refresh() {
      var ids = this._data.getIds({
        filter: this._options.filter
      });

      var oldIds = Object.keys(this._ids);
      var newIds = {};
      var addedIds = [];
      var removedIds = [];
      var removedItems = []; // check for additions

      for (var i = 0, len = ids.length; i < len; i++) {
        var id = ids[i];
        newIds[id] = true;

        if (!this._ids[id]) {
          addedIds.push(id);
          this._ids[id] = true;
        }
      } // check for removals


      for (var _i = 0, _len = oldIds.length; _i < _len; _i++) {
        var _id = oldIds[_i];

        var item = this._data.get(_id);

        if (item == null) {
          // @TODO: Investigate.
          // Doesn't happen during tests or examples.
          // Is it really impossible or could it eventually happen?
          // How to handle it if it does? The types guarantee non-nullable items.
          console.error('If you see this, report it please.');
        } else if (!newIds[_id]) {
          removedIds.push(_id);
          removedItems.push(item);
          delete this._ids[_id];
        }
      }

      this.length += addedIds.length - removedIds.length; // trigger events

      if (addedIds.length) {
        this._trigger('add', {
          items: addedIds
        });
      }

      if (removedIds.length) {
        this._trigger('remove', {
          items: removedIds,
          oldData: removedItems
        });
      }
    }
    /** @inheritdoc */

  }, {
    key: "get",
    value: function get(first, second) {
      if (this._data == null) {
        return null;
      } // parse the arguments


      var ids = null;
      var options;

      if (isId(first) || Array.isArray(first)) {
        ids = first;
        options = second;
      } else {
        options = first;
      } // extend the options with the default options and provided options


      var viewOptions = Object.assign({}, this._options, options); // create a combined filter method when needed

      var thisFilter = this._options.filter;
      var optionsFilter = options && options.filter;

      if (thisFilter && optionsFilter) {
        viewOptions.filter = function (item) {
          return thisFilter(item) && optionsFilter(item);
        };
      }

      if (ids == null) {
        return this._data.get(viewOptions);
      } else {
        return this._data.get(ids, viewOptions);
      }
    }
    /** @inheritdoc */

  }, {
    key: "getIds",
    value: function getIds(options) {
      if (this._data.length) {
        var defaultFilter = this._options.filter;
        var optionsFilter = options != null ? options.filter : null;
        var filter;

        if (optionsFilter) {
          if (defaultFilter) {
            filter = function filter(item) {
              return defaultFilter(item) && optionsFilter(item);
            };
          } else {
            filter = optionsFilter;
          }
        } else {
          filter = defaultFilter;
        }

        return this._data.getIds({
          filter: filter,
          order: options && options.order
        });
      } else {
        return [];
      }
    }
    /** @inheritdoc */

  }, {
    key: "forEach",
    value: function forEach(callback, options) {
      if (this._data) {
        var defaultFilter = this._options.filter;
        var optionsFilter = options && options.filter;
        var filter;

        if (optionsFilter) {
          if (defaultFilter) {
            filter = function filter(item) {
              return defaultFilter(item) && optionsFilter(item);
            };
          } else {
            filter = optionsFilter;
          }
        } else {
          filter = defaultFilter;
        }

        this._data.forEach(callback, {
          filter: filter,
          order: options && options.order
        });
      }
    }
    /** @inheritdoc */

  }, {
    key: "map",
    value: function map(callback, options) {
      if (this._data) {
        var defaultFilter = this._options.filter;
        var optionsFilter = options && options.filter;
        var filter;

        if (optionsFilter) {
          if (defaultFilter) {
            filter = function filter(item) {
              return defaultFilter(item) && optionsFilter(item);
            };
          } else {
            filter = optionsFilter;
          }
        } else {
          filter = defaultFilter;
        }

        return this._data.map(callback, {
          filter: filter,
          order: options && options.order
        });
      } else {
        return [];
      }
    }
    /** @inheritdoc */

  }, {
    key: "getDataSet",
    value: function getDataSet() {
      return this._data.getDataSet();
    }
    /**
     * Event listener. Will propagate all events from the connected data set to the subscribers of the DataView, but will filter the items and only trigger when there are changes in the filtered data set.
     *
     * @param event - The name of the event.
     * @param params - Parameters of the event.
     * @param senderId - Id supplied by the sender.
     */

  }, {
    key: "_onEvent",
    value: function _onEvent(event, params, senderId) {
      if (!params || !params.items || !this._data) {
        return;
      }

      var ids = params.items;
      var addedIds = [];
      var updatedIds = [];
      var removedIds = [];
      var oldItems = [];
      var updatedItems = [];
      var removedItems = [];

      switch (event) {
        case 'add':
          // filter the ids of the added items
          for (var i = 0, len = ids.length; i < len; i++) {
            var id = ids[i];
            var item = this.get(id);

            if (item) {
              this._ids[id] = true;
              addedIds.push(id);
            }
          }

          break;

        case 'update':
          // determine the event from the views viewpoint: an updated
          // item can be added, updated, or removed from this view.
          for (var _i2 = 0, _len2 = ids.length; _i2 < _len2; _i2++) {
            var _id2 = ids[_i2];

            var _item = this.get(_id2);

            if (_item) {
              if (this._ids[_id2]) {
                updatedIds.push(_id2);
                updatedItems.push(params.data[_i2]);
                oldItems.push(params.oldData[_i2]);
              } else {
                this._ids[_id2] = true;
                addedIds.push(_id2);
              }
            } else {
              if (this._ids[_id2]) {
                delete this._ids[_id2];
                removedIds.push(_id2);
                removedItems.push(params.oldData[_i2]);
              }
            }
          }

          break;

        case 'remove':
          // filter the ids of the removed items
          for (var _i3 = 0, _len3 = ids.length; _i3 < _len3; _i3++) {
            var _id3 = ids[_i3];

            if (this._ids[_id3]) {
              delete this._ids[_id3];
              removedIds.push(_id3);
              removedItems.push(params.oldData[_i3]);
            }
          }

          break;
      }

      this.length += addedIds.length - removedIds.length;

      if (addedIds.length) {
        this._trigger('add', {
          items: addedIds
        }, senderId);
      }

      if (updatedIds.length) {
        this._trigger('update', {
          items: updatedIds,
          oldData: oldItems,
          data: updatedItems
        }, senderId);
      }

      if (removedIds.length) {
        this._trigger('remove', {
          items: removedIds,
          oldData: removedItems
        }, senderId);
      }
    }
  }]);
  return DataView;
}(DataSetPart);

var index = {
  DataSet: DataSet,
  DataView: DataView,
  Queue: Queue
};

var moment$2 = createCommonjsModule$1(function (module, exports) {

  (function (global, factory) {
     module.exports = factory() ;
  })(commonjsGlobal$1, function () {

    var hookCallback;

    function hooks() {
      return hookCallback.apply(null, arguments);
    } // This is done to register the method called with moment()
    // without creating circular dependencies.


    function setHookCallback(callback) {
      hookCallback = callback;
    }

    function isArray(input) {
      return input instanceof Array || Object.prototype.toString.call(input) === '[object Array]';
    }

    function isObject(input) {
      // IE8 will treat undefined and null as object if it wasn't for
      // input != null
      return input != null && Object.prototype.toString.call(input) === '[object Object]';
    }

    function isObjectEmpty(obj) {
      if (Object.getOwnPropertyNames) {
        return Object.getOwnPropertyNames(obj).length === 0;
      } else {
        var k;

        for (k in obj) {
          if (obj.hasOwnProperty(k)) {
            return false;
          }
        }

        return true;
      }
    }

    function isUndefined(input) {
      return input === void 0;
    }

    function isNumber(input) {
      return typeof input === 'number' || Object.prototype.toString.call(input) === '[object Number]';
    }

    function isDate(input) {
      return input instanceof Date || Object.prototype.toString.call(input) === '[object Date]';
    }

    function map(arr, fn) {
      var res = [],
          i;

      for (i = 0; i < arr.length; ++i) {
        res.push(fn(arr[i], i));
      }

      return res;
    }

    function hasOwnProp(a, b) {
      return Object.prototype.hasOwnProperty.call(a, b);
    }

    function extend(a, b) {
      for (var i in b) {
        if (hasOwnProp(b, i)) {
          a[i] = b[i];
        }
      }

      if (hasOwnProp(b, 'toString')) {
        a.toString = b.toString;
      }

      if (hasOwnProp(b, 'valueOf')) {
        a.valueOf = b.valueOf;
      }

      return a;
    }

    function createUTC(input, format, locale, strict) {
      return createLocalOrUTC(input, format, locale, strict, true).utc();
    }

    function defaultParsingFlags() {
      // We need to deep clone this object.
      return {
        empty: false,
        unusedTokens: [],
        unusedInput: [],
        overflow: -2,
        charsLeftOver: 0,
        nullInput: false,
        invalidMonth: null,
        invalidFormat: false,
        userInvalidated: false,
        iso: false,
        parsedDateParts: [],
        meridiem: null,
        rfc2822: false,
        weekdayMismatch: false
      };
    }

    function getParsingFlags(m) {
      if (m._pf == null) {
        m._pf = defaultParsingFlags();
      }

      return m._pf;
    }

    var some;

    if (Array.prototype.some) {
      some = Array.prototype.some;
    } else {
      some = function (fun) {
        var t = Object(this);
        var len = t.length >>> 0;

        for (var i = 0; i < len; i++) {
          if (i in t && fun.call(this, t[i], i, t)) {
            return true;
          }
        }

        return false;
      };
    }

    function isValid(m) {
      if (m._isValid == null) {
        var flags = getParsingFlags(m);
        var parsedParts = some.call(flags.parsedDateParts, function (i) {
          return i != null;
        });
        var isNowValid = !isNaN(m._d.getTime()) && flags.overflow < 0 && !flags.empty && !flags.invalidMonth && !flags.invalidWeekday && !flags.weekdayMismatch && !flags.nullInput && !flags.invalidFormat && !flags.userInvalidated && (!flags.meridiem || flags.meridiem && parsedParts);

        if (m._strict) {
          isNowValid = isNowValid && flags.charsLeftOver === 0 && flags.unusedTokens.length === 0 && flags.bigHour === undefined;
        }

        if (Object.isFrozen == null || !Object.isFrozen(m)) {
          m._isValid = isNowValid;
        } else {
          return isNowValid;
        }
      }

      return m._isValid;
    }

    function createInvalid(flags) {
      var m = createUTC(NaN);

      if (flags != null) {
        extend(getParsingFlags(m), flags);
      } else {
        getParsingFlags(m).userInvalidated = true;
      }

      return m;
    } // Plugins that add properties should also add the key here (null value),
    // so we can properly clone ourselves.


    var momentProperties = hooks.momentProperties = [];

    function copyConfig(to, from) {
      var i, prop, val;

      if (!isUndefined(from._isAMomentObject)) {
        to._isAMomentObject = from._isAMomentObject;
      }

      if (!isUndefined(from._i)) {
        to._i = from._i;
      }

      if (!isUndefined(from._f)) {
        to._f = from._f;
      }

      if (!isUndefined(from._l)) {
        to._l = from._l;
      }

      if (!isUndefined(from._strict)) {
        to._strict = from._strict;
      }

      if (!isUndefined(from._tzm)) {
        to._tzm = from._tzm;
      }

      if (!isUndefined(from._isUTC)) {
        to._isUTC = from._isUTC;
      }

      if (!isUndefined(from._offset)) {
        to._offset = from._offset;
      }

      if (!isUndefined(from._pf)) {
        to._pf = getParsingFlags(from);
      }

      if (!isUndefined(from._locale)) {
        to._locale = from._locale;
      }

      if (momentProperties.length > 0) {
        for (i = 0; i < momentProperties.length; i++) {
          prop = momentProperties[i];
          val = from[prop];

          if (!isUndefined(val)) {
            to[prop] = val;
          }
        }
      }

      return to;
    }

    var updateInProgress = false; // Moment prototype object

    function Moment(config) {
      copyConfig(this, config);
      this._d = new Date(config._d != null ? config._d.getTime() : NaN);

      if (!this.isValid()) {
        this._d = new Date(NaN);
      } // Prevent infinite loop in case updateOffset creates new moment
      // objects.


      if (updateInProgress === false) {
        updateInProgress = true;
        hooks.updateOffset(this);
        updateInProgress = false;
      }
    }

    function isMoment(obj) {
      return obj instanceof Moment || obj != null && obj._isAMomentObject != null;
    }

    function absFloor(number) {
      if (number < 0) {
        // -0 -> 0
        return Math.ceil(number) || 0;
      } else {
        return Math.floor(number);
      }
    }

    function toInt(argumentForCoercion) {
      var coercedNumber = +argumentForCoercion,
          value = 0;

      if (coercedNumber !== 0 && isFinite(coercedNumber)) {
        value = absFloor(coercedNumber);
      }

      return value;
    } // compare two arrays, return the number of differences


    function compareArrays(array1, array2, dontConvert) {
      var len = Math.min(array1.length, array2.length),
          lengthDiff = Math.abs(array1.length - array2.length),
          diffs = 0,
          i;

      for (i = 0; i < len; i++) {
        if (dontConvert && array1[i] !== array2[i] || !dontConvert && toInt(array1[i]) !== toInt(array2[i])) {
          diffs++;
        }
      }

      return diffs + lengthDiff;
    }

    function warn(msg) {
      if (hooks.suppressDeprecationWarnings === false && typeof console !== 'undefined' && console.warn) {
        console.warn('Deprecation warning: ' + msg);
      }
    }

    function deprecate(msg, fn) {
      var firstTime = true;
      return extend(function () {
        if (hooks.deprecationHandler != null) {
          hooks.deprecationHandler(null, msg);
        }

        if (firstTime) {
          var args = [];
          var arg;

          for (var i = 0; i < arguments.length; i++) {
            arg = '';

            if (typeof arguments[i] === 'object') {
              arg += '\n[' + i + '] ';

              for (var key in arguments[0]) {
                arg += key + ': ' + arguments[0][key] + ', ';
              }

              arg = arg.slice(0, -2); // Remove trailing comma and space
            } else {
              arg = arguments[i];
            }

            args.push(arg);
          }

          warn(msg + '\nArguments: ' + Array.prototype.slice.call(args).join('') + '\n' + new Error().stack);
          firstTime = false;
        }

        return fn.apply(this, arguments);
      }, fn);
    }

    var deprecations = {};

    function deprecateSimple(name, msg) {
      if (hooks.deprecationHandler != null) {
        hooks.deprecationHandler(name, msg);
      }

      if (!deprecations[name]) {
        warn(msg);
        deprecations[name] = true;
      }
    }

    hooks.suppressDeprecationWarnings = false;
    hooks.deprecationHandler = null;

    function isFunction(input) {
      return input instanceof Function || Object.prototype.toString.call(input) === '[object Function]';
    }

    function set(config) {
      var prop, i;

      for (i in config) {
        prop = config[i];

        if (isFunction(prop)) {
          this[i] = prop;
        } else {
          this['_' + i] = prop;
        }
      }

      this._config = config; // Lenient ordinal parsing accepts just a number in addition to
      // number + (possibly) stuff coming from _dayOfMonthOrdinalParse.
      // TODO: Remove "ordinalParse" fallback in next major release.

      this._dayOfMonthOrdinalParseLenient = new RegExp((this._dayOfMonthOrdinalParse.source || this._ordinalParse.source) + '|' + /\d{1,2}/.source);
    }

    function mergeConfigs(parentConfig, childConfig) {
      var res = extend({}, parentConfig),
          prop;

      for (prop in childConfig) {
        if (hasOwnProp(childConfig, prop)) {
          if (isObject(parentConfig[prop]) && isObject(childConfig[prop])) {
            res[prop] = {};
            extend(res[prop], parentConfig[prop]);
            extend(res[prop], childConfig[prop]);
          } else if (childConfig[prop] != null) {
            res[prop] = childConfig[prop];
          } else {
            delete res[prop];
          }
        }
      }

      for (prop in parentConfig) {
        if (hasOwnProp(parentConfig, prop) && !hasOwnProp(childConfig, prop) && isObject(parentConfig[prop])) {
          // make sure changes to properties don't modify parent config
          res[prop] = extend({}, res[prop]);
        }
      }

      return res;
    }

    function Locale(config) {
      if (config != null) {
        this.set(config);
      }
    }

    var keys;

    if (Object.keys) {
      keys = Object.keys;
    } else {
      keys = function (obj) {
        var i,
            res = [];

        for (i in obj) {
          if (hasOwnProp(obj, i)) {
            res.push(i);
          }
        }

        return res;
      };
    }

    var defaultCalendar = {
      sameDay: '[Today at] LT',
      nextDay: '[Tomorrow at] LT',
      nextWeek: 'dddd [at] LT',
      lastDay: '[Yesterday at] LT',
      lastWeek: '[Last] dddd [at] LT',
      sameElse: 'L'
    };

    function calendar(key, mom, now) {
      var output = this._calendar[key] || this._calendar['sameElse'];
      return isFunction(output) ? output.call(mom, now) : output;
    }

    var defaultLongDateFormat = {
      LTS: 'h:mm:ss A',
      LT: 'h:mm A',
      L: 'MM/DD/YYYY',
      LL: 'MMMM D, YYYY',
      LLL: 'MMMM D, YYYY h:mm A',
      LLLL: 'dddd, MMMM D, YYYY h:mm A'
    };

    function longDateFormat(key) {
      var format = this._longDateFormat[key],
          formatUpper = this._longDateFormat[key.toUpperCase()];

      if (format || !formatUpper) {
        return format;
      }

      this._longDateFormat[key] = formatUpper.replace(/MMMM|MM|DD|dddd/g, function (val) {
        return val.slice(1);
      });
      return this._longDateFormat[key];
    }

    var defaultInvalidDate = 'Invalid date';

    function invalidDate() {
      return this._invalidDate;
    }

    var defaultOrdinal = '%d';
    var defaultDayOfMonthOrdinalParse = /\d{1,2}/;

    function ordinal(number) {
      return this._ordinal.replace('%d', number);
    }

    var defaultRelativeTime = {
      future: 'in %s',
      past: '%s ago',
      s: 'a few seconds',
      ss: '%d seconds',
      m: 'a minute',
      mm: '%d minutes',
      h: 'an hour',
      hh: '%d hours',
      d: 'a day',
      dd: '%d days',
      M: 'a month',
      MM: '%d months',
      y: 'a year',
      yy: '%d years'
    };

    function relativeTime(number, withoutSuffix, string, isFuture) {
      var output = this._relativeTime[string];
      return isFunction(output) ? output(number, withoutSuffix, string, isFuture) : output.replace(/%d/i, number);
    }

    function pastFuture(diff, output) {
      var format = this._relativeTime[diff > 0 ? 'future' : 'past'];
      return isFunction(format) ? format(output) : format.replace(/%s/i, output);
    }

    var aliases = {};

    function addUnitAlias(unit, shorthand) {
      var lowerCase = unit.toLowerCase();
      aliases[lowerCase] = aliases[lowerCase + 's'] = aliases[shorthand] = unit;
    }

    function normalizeUnits(units) {
      return typeof units === 'string' ? aliases[units] || aliases[units.toLowerCase()] : undefined;
    }

    function normalizeObjectUnits(inputObject) {
      var normalizedInput = {},
          normalizedProp,
          prop;

      for (prop in inputObject) {
        if (hasOwnProp(inputObject, prop)) {
          normalizedProp = normalizeUnits(prop);

          if (normalizedProp) {
            normalizedInput[normalizedProp] = inputObject[prop];
          }
        }
      }

      return normalizedInput;
    }

    var priorities = {};

    function addUnitPriority(unit, priority) {
      priorities[unit] = priority;
    }

    function getPrioritizedUnits(unitsObj) {
      var units = [];

      for (var u in unitsObj) {
        units.push({
          unit: u,
          priority: priorities[u]
        });
      }

      units.sort(function (a, b) {
        return a.priority - b.priority;
      });
      return units;
    }

    function zeroFill(number, targetLength, forceSign) {
      var absNumber = '' + Math.abs(number),
          zerosToFill = targetLength - absNumber.length,
          sign = number >= 0;
      return (sign ? forceSign ? '+' : '' : '-') + Math.pow(10, Math.max(0, zerosToFill)).toString().substr(1) + absNumber;
    }

    var formattingTokens = /(\[[^\[]*\])|(\\)?([Hh]mm(ss)?|Mo|MM?M?M?|Do|DDDo|DD?D?D?|ddd?d?|do?|w[o|w]?|W[o|W]?|Qo?|YYYYYY|YYYYY|YYYY|YY|gg(ggg?)?|GG(GGG?)?|e|E|a|A|hh?|HH?|kk?|mm?|ss?|S{1,9}|x|X|zz?|ZZ?|.)/g;
    var localFormattingTokens = /(\[[^\[]*\])|(\\)?(LTS|LT|LL?L?L?|l{1,4})/g;
    var formatFunctions = {};
    var formatTokenFunctions = {}; // token:    'M'
    // padded:   ['MM', 2]
    // ordinal:  'Mo'
    // callback: function () { this.month() + 1 }

    function addFormatToken(token, padded, ordinal, callback) {
      var func = callback;

      if (typeof callback === 'string') {
        func = function () {
          return this[callback]();
        };
      }

      if (token) {
        formatTokenFunctions[token] = func;
      }

      if (padded) {
        formatTokenFunctions[padded[0]] = function () {
          return zeroFill(func.apply(this, arguments), padded[1], padded[2]);
        };
      }

      if (ordinal) {
        formatTokenFunctions[ordinal] = function () {
          return this.localeData().ordinal(func.apply(this, arguments), token);
        };
      }
    }

    function removeFormattingTokens(input) {
      if (input.match(/\[[\s\S]/)) {
        return input.replace(/^\[|\]$/g, '');
      }

      return input.replace(/\\/g, '');
    }

    function makeFormatFunction(format) {
      var array = format.match(formattingTokens),
          i,
          length;

      for (i = 0, length = array.length; i < length; i++) {
        if (formatTokenFunctions[array[i]]) {
          array[i] = formatTokenFunctions[array[i]];
        } else {
          array[i] = removeFormattingTokens(array[i]);
        }
      }

      return function (mom) {
        var output = '',
            i;

        for (i = 0; i < length; i++) {
          output += isFunction(array[i]) ? array[i].call(mom, format) : array[i];
        }

        return output;
      };
    } // format date using native date object


    function formatMoment(m, format) {
      if (!m.isValid()) {
        return m.localeData().invalidDate();
      }

      format = expandFormat(format, m.localeData());
      formatFunctions[format] = formatFunctions[format] || makeFormatFunction(format);
      return formatFunctions[format](m);
    }

    function expandFormat(format, locale) {
      var i = 5;

      function replaceLongDateFormatTokens(input) {
        return locale.longDateFormat(input) || input;
      }

      localFormattingTokens.lastIndex = 0;

      while (i >= 0 && localFormattingTokens.test(format)) {
        format = format.replace(localFormattingTokens, replaceLongDateFormatTokens);
        localFormattingTokens.lastIndex = 0;
        i -= 1;
      }

      return format;
    }

    var match1 = /\d/; //       0 - 9

    var match2 = /\d\d/; //      00 - 99

    var match3 = /\d{3}/; //     000 - 999

    var match4 = /\d{4}/; //    0000 - 9999

    var match6 = /[+-]?\d{6}/; // -999999 - 999999

    var match1to2 = /\d\d?/; //       0 - 99

    var match3to4 = /\d\d\d\d?/; //     999 - 9999

    var match5to6 = /\d\d\d\d\d\d?/; //   99999 - 999999

    var match1to3 = /\d{1,3}/; //       0 - 999

    var match1to4 = /\d{1,4}/; //       0 - 9999

    var match1to6 = /[+-]?\d{1,6}/; // -999999 - 999999

    var matchUnsigned = /\d+/; //       0 - inf

    var matchSigned = /[+-]?\d+/; //    -inf - inf

    var matchOffset = /Z|[+-]\d\d:?\d\d/gi; // +00:00 -00:00 +0000 -0000 or Z

    var matchShortOffset = /Z|[+-]\d\d(?::?\d\d)?/gi; // +00 -00 +00:00 -00:00 +0000 -0000 or Z

    var matchTimestamp = /[+-]?\d+(\.\d{1,3})?/; // 123456789 123456789.123
    // any word (or two) characters or numbers including two/three word month in arabic.
    // includes scottish gaelic two word and hyphenated months

    var matchWord = /[0-9]{0,256}['a-z\u00A0-\u05FF\u0700-\uD7FF\uF900-\uFDCF\uFDF0-\uFF07\uFF10-\uFFEF]{1,256}|[\u0600-\u06FF\/]{1,256}(\s*?[\u0600-\u06FF]{1,256}){1,2}/i;
    var regexes = {};

    function addRegexToken(token, regex, strictRegex) {
      regexes[token] = isFunction(regex) ? regex : function (isStrict, localeData) {
        return isStrict && strictRegex ? strictRegex : regex;
      };
    }

    function getParseRegexForToken(token, config) {
      if (!hasOwnProp(regexes, token)) {
        return new RegExp(unescapeFormat(token));
      }

      return regexes[token](config._strict, config._locale);
    } // Code from http://stackoverflow.com/questions/3561493/is-there-a-regexp-escape-function-in-javascript


    function unescapeFormat(s) {
      return regexEscape(s.replace('\\', '').replace(/\\(\[)|\\(\])|\[([^\]\[]*)\]|\\(.)/g, function (matched, p1, p2, p3, p4) {
        return p1 || p2 || p3 || p4;
      }));
    }

    function regexEscape(s) {
      return s.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
    }

    var tokens = {};

    function addParseToken(token, callback) {
      var i,
          func = callback;

      if (typeof token === 'string') {
        token = [token];
      }

      if (isNumber(callback)) {
        func = function (input, array) {
          array[callback] = toInt(input);
        };
      }

      for (i = 0; i < token.length; i++) {
        tokens[token[i]] = func;
      }
    }

    function addWeekParseToken(token, callback) {
      addParseToken(token, function (input, array, config, token) {
        config._w = config._w || {};
        callback(input, config._w, config, token);
      });
    }

    function addTimeToArrayFromToken(token, input, config) {
      if (input != null && hasOwnProp(tokens, token)) {
        tokens[token](input, config._a, config, token);
      }
    }

    var YEAR = 0;
    var MONTH = 1;
    var DATE = 2;
    var HOUR = 3;
    var MINUTE = 4;
    var SECOND = 5;
    var MILLISECOND = 6;
    var WEEK = 7;
    var WEEKDAY = 8; // FORMATTING

    addFormatToken('Y', 0, 0, function () {
      var y = this.year();
      return y <= 9999 ? '' + y : '+' + y;
    });
    addFormatToken(0, ['YY', 2], 0, function () {
      return this.year() % 100;
    });
    addFormatToken(0, ['YYYY', 4], 0, 'year');
    addFormatToken(0, ['YYYYY', 5], 0, 'year');
    addFormatToken(0, ['YYYYYY', 6, true], 0, 'year'); // ALIASES

    addUnitAlias('year', 'y'); // PRIORITIES

    addUnitPriority('year', 1); // PARSING

    addRegexToken('Y', matchSigned);
    addRegexToken('YY', match1to2, match2);
    addRegexToken('YYYY', match1to4, match4);
    addRegexToken('YYYYY', match1to6, match6);
    addRegexToken('YYYYYY', match1to6, match6);
    addParseToken(['YYYYY', 'YYYYYY'], YEAR);
    addParseToken('YYYY', function (input, array) {
      array[YEAR] = input.length === 2 ? hooks.parseTwoDigitYear(input) : toInt(input);
    });
    addParseToken('YY', function (input, array) {
      array[YEAR] = hooks.parseTwoDigitYear(input);
    });
    addParseToken('Y', function (input, array) {
      array[YEAR] = parseInt(input, 10);
    }); // HELPERS

    function daysInYear(year) {
      return isLeapYear(year) ? 366 : 365;
    }

    function isLeapYear(year) {
      return year % 4 === 0 && year % 100 !== 0 || year % 400 === 0;
    } // HOOKS


    hooks.parseTwoDigitYear = function (input) {
      return toInt(input) + (toInt(input) > 68 ? 1900 : 2000);
    }; // MOMENTS


    var getSetYear = makeGetSet('FullYear', true);

    function getIsLeapYear() {
      return isLeapYear(this.year());
    }

    function makeGetSet(unit, keepTime) {
      return function (value) {
        if (value != null) {
          set$1(this, unit, value);
          hooks.updateOffset(this, keepTime);
          return this;
        } else {
          return get(this, unit);
        }
      };
    }

    function get(mom, unit) {
      return mom.isValid() ? mom._d['get' + (mom._isUTC ? 'UTC' : '') + unit]() : NaN;
    }

    function set$1(mom, unit, value) {
      if (mom.isValid() && !isNaN(value)) {
        if (unit === 'FullYear' && isLeapYear(mom.year()) && mom.month() === 1 && mom.date() === 29) {
          mom._d['set' + (mom._isUTC ? 'UTC' : '') + unit](value, mom.month(), daysInMonth(value, mom.month()));
        } else {
          mom._d['set' + (mom._isUTC ? 'UTC' : '') + unit](value);
        }
      }
    } // MOMENTS


    function stringGet(units) {
      units = normalizeUnits(units);

      if (isFunction(this[units])) {
        return this[units]();
      }

      return this;
    }

    function stringSet(units, value) {
      if (typeof units === 'object') {
        units = normalizeObjectUnits(units);
        var prioritized = getPrioritizedUnits(units);

        for (var i = 0; i < prioritized.length; i++) {
          this[prioritized[i].unit](units[prioritized[i].unit]);
        }
      } else {
        units = normalizeUnits(units);

        if (isFunction(this[units])) {
          return this[units](value);
        }
      }

      return this;
    }

    function mod(n, x) {
      return (n % x + x) % x;
    }

    var indexOf;

    if (Array.prototype.indexOf) {
      indexOf = Array.prototype.indexOf;
    } else {
      indexOf = function (o) {
        // I know
        var i;

        for (i = 0; i < this.length; ++i) {
          if (this[i] === o) {
            return i;
          }
        }

        return -1;
      };
    }

    function daysInMonth(year, month) {
      if (isNaN(year) || isNaN(month)) {
        return NaN;
      }

      var modMonth = mod(month, 12);
      year += (month - modMonth) / 12;
      return modMonth === 1 ? isLeapYear(year) ? 29 : 28 : 31 - modMonth % 7 % 2;
    } // FORMATTING


    addFormatToken('M', ['MM', 2], 'Mo', function () {
      return this.month() + 1;
    });
    addFormatToken('MMM', 0, 0, function (format) {
      return this.localeData().monthsShort(this, format);
    });
    addFormatToken('MMMM', 0, 0, function (format) {
      return this.localeData().months(this, format);
    }); // ALIASES

    addUnitAlias('month', 'M'); // PRIORITY

    addUnitPriority('month', 8); // PARSING

    addRegexToken('M', match1to2);
    addRegexToken('MM', match1to2, match2);
    addRegexToken('MMM', function (isStrict, locale) {
      return locale.monthsShortRegex(isStrict);
    });
    addRegexToken('MMMM', function (isStrict, locale) {
      return locale.monthsRegex(isStrict);
    });
    addParseToken(['M', 'MM'], function (input, array) {
      array[MONTH] = toInt(input) - 1;
    });
    addParseToken(['MMM', 'MMMM'], function (input, array, config, token) {
      var month = config._locale.monthsParse(input, token, config._strict); // if we didn't find a month name, mark the date as invalid.


      if (month != null) {
        array[MONTH] = month;
      } else {
        getParsingFlags(config).invalidMonth = input;
      }
    }); // LOCALES

    var MONTHS_IN_FORMAT = /D[oD]?(\[[^\[\]]*\]|\s)+MMMM?/;
    var defaultLocaleMonths = 'January_February_March_April_May_June_July_August_September_October_November_December'.split('_');

    function localeMonths(m, format) {
      if (!m) {
        return isArray(this._months) ? this._months : this._months['standalone'];
      }

      return isArray(this._months) ? this._months[m.month()] : this._months[(this._months.isFormat || MONTHS_IN_FORMAT).test(format) ? 'format' : 'standalone'][m.month()];
    }

    var defaultLocaleMonthsShort = 'Jan_Feb_Mar_Apr_May_Jun_Jul_Aug_Sep_Oct_Nov_Dec'.split('_');

    function localeMonthsShort(m, format) {
      if (!m) {
        return isArray(this._monthsShort) ? this._monthsShort : this._monthsShort['standalone'];
      }

      return isArray(this._monthsShort) ? this._monthsShort[m.month()] : this._monthsShort[MONTHS_IN_FORMAT.test(format) ? 'format' : 'standalone'][m.month()];
    }

    function handleStrictParse(monthName, format, strict) {
      var i,
          ii,
          mom,
          llc = monthName.toLocaleLowerCase();

      if (!this._monthsParse) {
        // this is not used
        this._monthsParse = [];
        this._longMonthsParse = [];
        this._shortMonthsParse = [];

        for (i = 0; i < 12; ++i) {
          mom = createUTC([2000, i]);
          this._shortMonthsParse[i] = this.monthsShort(mom, '').toLocaleLowerCase();
          this._longMonthsParse[i] = this.months(mom, '').toLocaleLowerCase();
        }
      }

      if (strict) {
        if (format === 'MMM') {
          ii = indexOf.call(this._shortMonthsParse, llc);
          return ii !== -1 ? ii : null;
        } else {
          ii = indexOf.call(this._longMonthsParse, llc);
          return ii !== -1 ? ii : null;
        }
      } else {
        if (format === 'MMM') {
          ii = indexOf.call(this._shortMonthsParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._longMonthsParse, llc);
          return ii !== -1 ? ii : null;
        } else {
          ii = indexOf.call(this._longMonthsParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._shortMonthsParse, llc);
          return ii !== -1 ? ii : null;
        }
      }
    }

    function localeMonthsParse(monthName, format, strict) {
      var i, mom, regex;

      if (this._monthsParseExact) {
        return handleStrictParse.call(this, monthName, format, strict);
      }

      if (!this._monthsParse) {
        this._monthsParse = [];
        this._longMonthsParse = [];
        this._shortMonthsParse = [];
      } // TODO: add sorting
      // Sorting makes sure if one month (or abbr) is a prefix of another
      // see sorting in computeMonthsParse


      for (i = 0; i < 12; i++) {
        // make the regex if we don't have it already
        mom = createUTC([2000, i]);

        if (strict && !this._longMonthsParse[i]) {
          this._longMonthsParse[i] = new RegExp('^' + this.months(mom, '').replace('.', '') + '$', 'i');
          this._shortMonthsParse[i] = new RegExp('^' + this.monthsShort(mom, '').replace('.', '') + '$', 'i');
        }

        if (!strict && !this._monthsParse[i]) {
          regex = '^' + this.months(mom, '') + '|^' + this.monthsShort(mom, '');
          this._monthsParse[i] = new RegExp(regex.replace('.', ''), 'i');
        } // test the regex


        if (strict && format === 'MMMM' && this._longMonthsParse[i].test(monthName)) {
          return i;
        } else if (strict && format === 'MMM' && this._shortMonthsParse[i].test(monthName)) {
          return i;
        } else if (!strict && this._monthsParse[i].test(monthName)) {
          return i;
        }
      }
    } // MOMENTS


    function setMonth(mom, value) {
      var dayOfMonth;

      if (!mom.isValid()) {
        // No op
        return mom;
      }

      if (typeof value === 'string') {
        if (/^\d+$/.test(value)) {
          value = toInt(value);
        } else {
          value = mom.localeData().monthsParse(value); // TODO: Another silent failure?

          if (!isNumber(value)) {
            return mom;
          }
        }
      }

      dayOfMonth = Math.min(mom.date(), daysInMonth(mom.year(), value));

      mom._d['set' + (mom._isUTC ? 'UTC' : '') + 'Month'](value, dayOfMonth);

      return mom;
    }

    function getSetMonth(value) {
      if (value != null) {
        setMonth(this, value);
        hooks.updateOffset(this, true);
        return this;
      } else {
        return get(this, 'Month');
      }
    }

    function getDaysInMonth() {
      return daysInMonth(this.year(), this.month());
    }

    var defaultMonthsShortRegex = matchWord;

    function monthsShortRegex(isStrict) {
      if (this._monthsParseExact) {
        if (!hasOwnProp(this, '_monthsRegex')) {
          computeMonthsParse.call(this);
        }

        if (isStrict) {
          return this._monthsShortStrictRegex;
        } else {
          return this._monthsShortRegex;
        }
      } else {
        if (!hasOwnProp(this, '_monthsShortRegex')) {
          this._monthsShortRegex = defaultMonthsShortRegex;
        }

        return this._monthsShortStrictRegex && isStrict ? this._monthsShortStrictRegex : this._monthsShortRegex;
      }
    }

    var defaultMonthsRegex = matchWord;

    function monthsRegex(isStrict) {
      if (this._monthsParseExact) {
        if (!hasOwnProp(this, '_monthsRegex')) {
          computeMonthsParse.call(this);
        }

        if (isStrict) {
          return this._monthsStrictRegex;
        } else {
          return this._monthsRegex;
        }
      } else {
        if (!hasOwnProp(this, '_monthsRegex')) {
          this._monthsRegex = defaultMonthsRegex;
        }

        return this._monthsStrictRegex && isStrict ? this._monthsStrictRegex : this._monthsRegex;
      }
    }

    function computeMonthsParse() {
      function cmpLenRev(a, b) {
        return b.length - a.length;
      }

      var shortPieces = [],
          longPieces = [],
          mixedPieces = [],
          i,
          mom;

      for (i = 0; i < 12; i++) {
        // make the regex if we don't have it already
        mom = createUTC([2000, i]);
        shortPieces.push(this.monthsShort(mom, ''));
        longPieces.push(this.months(mom, ''));
        mixedPieces.push(this.months(mom, ''));
        mixedPieces.push(this.monthsShort(mom, ''));
      } // Sorting makes sure if one month (or abbr) is a prefix of another it
      // will match the longer piece.


      shortPieces.sort(cmpLenRev);
      longPieces.sort(cmpLenRev);
      mixedPieces.sort(cmpLenRev);

      for (i = 0; i < 12; i++) {
        shortPieces[i] = regexEscape(shortPieces[i]);
        longPieces[i] = regexEscape(longPieces[i]);
      }

      for (i = 0; i < 24; i++) {
        mixedPieces[i] = regexEscape(mixedPieces[i]);
      }

      this._monthsRegex = new RegExp('^(' + mixedPieces.join('|') + ')', 'i');
      this._monthsShortRegex = this._monthsRegex;
      this._monthsStrictRegex = new RegExp('^(' + longPieces.join('|') + ')', 'i');
      this._monthsShortStrictRegex = new RegExp('^(' + shortPieces.join('|') + ')', 'i');
    }

    function createDate(y, m, d, h, M, s, ms) {
      // can't just apply() to create a date:
      // https://stackoverflow.com/q/181348
      var date; // the date constructor remaps years 0-99 to 1900-1999

      if (y < 100 && y >= 0) {
        // preserve leap years using a full 400 year cycle, then reset
        date = new Date(y + 400, m, d, h, M, s, ms);

        if (isFinite(date.getFullYear())) {
          date.setFullYear(y);
        }
      } else {
        date = new Date(y, m, d, h, M, s, ms);
      }

      return date;
    }

    function createUTCDate(y) {
      var date; // the Date.UTC function remaps years 0-99 to 1900-1999

      if (y < 100 && y >= 0) {
        var args = Array.prototype.slice.call(arguments); // preserve leap years using a full 400 year cycle, then reset

        args[0] = y + 400;
        date = new Date(Date.UTC.apply(null, args));

        if (isFinite(date.getUTCFullYear())) {
          date.setUTCFullYear(y);
        }
      } else {
        date = new Date(Date.UTC.apply(null, arguments));
      }

      return date;
    } // start-of-first-week - start-of-year


    function firstWeekOffset(year, dow, doy) {
      var // first-week day -- which january is always in the first week (4 for iso, 1 for other)
      fwd = 7 + dow - doy,
          // first-week day local weekday -- which local weekday is fwd
      fwdlw = (7 + createUTCDate(year, 0, fwd).getUTCDay() - dow) % 7;
      return -fwdlw + fwd - 1;
    } // https://en.wikipedia.org/wiki/ISO_week_date#Calculating_a_date_given_the_year.2C_week_number_and_weekday


    function dayOfYearFromWeeks(year, week, weekday, dow, doy) {
      var localWeekday = (7 + weekday - dow) % 7,
          weekOffset = firstWeekOffset(year, dow, doy),
          dayOfYear = 1 + 7 * (week - 1) + localWeekday + weekOffset,
          resYear,
          resDayOfYear;

      if (dayOfYear <= 0) {
        resYear = year - 1;
        resDayOfYear = daysInYear(resYear) + dayOfYear;
      } else if (dayOfYear > daysInYear(year)) {
        resYear = year + 1;
        resDayOfYear = dayOfYear - daysInYear(year);
      } else {
        resYear = year;
        resDayOfYear = dayOfYear;
      }

      return {
        year: resYear,
        dayOfYear: resDayOfYear
      };
    }

    function weekOfYear(mom, dow, doy) {
      var weekOffset = firstWeekOffset(mom.year(), dow, doy),
          week = Math.floor((mom.dayOfYear() - weekOffset - 1) / 7) + 1,
          resWeek,
          resYear;

      if (week < 1) {
        resYear = mom.year() - 1;
        resWeek = week + weeksInYear(resYear, dow, doy);
      } else if (week > weeksInYear(mom.year(), dow, doy)) {
        resWeek = week - weeksInYear(mom.year(), dow, doy);
        resYear = mom.year() + 1;
      } else {
        resYear = mom.year();
        resWeek = week;
      }

      return {
        week: resWeek,
        year: resYear
      };
    }

    function weeksInYear(year, dow, doy) {
      var weekOffset = firstWeekOffset(year, dow, doy),
          weekOffsetNext = firstWeekOffset(year + 1, dow, doy);
      return (daysInYear(year) - weekOffset + weekOffsetNext) / 7;
    } // FORMATTING


    addFormatToken('w', ['ww', 2], 'wo', 'week');
    addFormatToken('W', ['WW', 2], 'Wo', 'isoWeek'); // ALIASES

    addUnitAlias('week', 'w');
    addUnitAlias('isoWeek', 'W'); // PRIORITIES

    addUnitPriority('week', 5);
    addUnitPriority('isoWeek', 5); // PARSING

    addRegexToken('w', match1to2);
    addRegexToken('ww', match1to2, match2);
    addRegexToken('W', match1to2);
    addRegexToken('WW', match1to2, match2);
    addWeekParseToken(['w', 'ww', 'W', 'WW'], function (input, week, config, token) {
      week[token.substr(0, 1)] = toInt(input);
    }); // HELPERS
    // LOCALES

    function localeWeek(mom) {
      return weekOfYear(mom, this._week.dow, this._week.doy).week;
    }

    var defaultLocaleWeek = {
      dow: 0,
      // Sunday is the first day of the week.
      doy: 6 // The week that contains Jan 6th is the first week of the year.

    };

    function localeFirstDayOfWeek() {
      return this._week.dow;
    }

    function localeFirstDayOfYear() {
      return this._week.doy;
    } // MOMENTS


    function getSetWeek(input) {
      var week = this.localeData().week(this);
      return input == null ? week : this.add((input - week) * 7, 'd');
    }

    function getSetISOWeek(input) {
      var week = weekOfYear(this, 1, 4).week;
      return input == null ? week : this.add((input - week) * 7, 'd');
    } // FORMATTING


    addFormatToken('d', 0, 'do', 'day');
    addFormatToken('dd', 0, 0, function (format) {
      return this.localeData().weekdaysMin(this, format);
    });
    addFormatToken('ddd', 0, 0, function (format) {
      return this.localeData().weekdaysShort(this, format);
    });
    addFormatToken('dddd', 0, 0, function (format) {
      return this.localeData().weekdays(this, format);
    });
    addFormatToken('e', 0, 0, 'weekday');
    addFormatToken('E', 0, 0, 'isoWeekday'); // ALIASES

    addUnitAlias('day', 'd');
    addUnitAlias('weekday', 'e');
    addUnitAlias('isoWeekday', 'E'); // PRIORITY

    addUnitPriority('day', 11);
    addUnitPriority('weekday', 11);
    addUnitPriority('isoWeekday', 11); // PARSING

    addRegexToken('d', match1to2);
    addRegexToken('e', match1to2);
    addRegexToken('E', match1to2);
    addRegexToken('dd', function (isStrict, locale) {
      return locale.weekdaysMinRegex(isStrict);
    });
    addRegexToken('ddd', function (isStrict, locale) {
      return locale.weekdaysShortRegex(isStrict);
    });
    addRegexToken('dddd', function (isStrict, locale) {
      return locale.weekdaysRegex(isStrict);
    });
    addWeekParseToken(['dd', 'ddd', 'dddd'], function (input, week, config, token) {
      var weekday = config._locale.weekdaysParse(input, token, config._strict); // if we didn't get a weekday name, mark the date as invalid


      if (weekday != null) {
        week.d = weekday;
      } else {
        getParsingFlags(config).invalidWeekday = input;
      }
    });
    addWeekParseToken(['d', 'e', 'E'], function (input, week, config, token) {
      week[token] = toInt(input);
    }); // HELPERS

    function parseWeekday(input, locale) {
      if (typeof input !== 'string') {
        return input;
      }

      if (!isNaN(input)) {
        return parseInt(input, 10);
      }

      input = locale.weekdaysParse(input);

      if (typeof input === 'number') {
        return input;
      }

      return null;
    }

    function parseIsoWeekday(input, locale) {
      if (typeof input === 'string') {
        return locale.weekdaysParse(input) % 7 || 7;
      }

      return isNaN(input) ? null : input;
    } // LOCALES


    function shiftWeekdays(ws, n) {
      return ws.slice(n, 7).concat(ws.slice(0, n));
    }

    var defaultLocaleWeekdays = 'Sunday_Monday_Tuesday_Wednesday_Thursday_Friday_Saturday'.split('_');

    function localeWeekdays(m, format) {
      var weekdays = isArray(this._weekdays) ? this._weekdays : this._weekdays[m && m !== true && this._weekdays.isFormat.test(format) ? 'format' : 'standalone'];
      return m === true ? shiftWeekdays(weekdays, this._week.dow) : m ? weekdays[m.day()] : weekdays;
    }

    var defaultLocaleWeekdaysShort = 'Sun_Mon_Tue_Wed_Thu_Fri_Sat'.split('_');

    function localeWeekdaysShort(m) {
      return m === true ? shiftWeekdays(this._weekdaysShort, this._week.dow) : m ? this._weekdaysShort[m.day()] : this._weekdaysShort;
    }

    var defaultLocaleWeekdaysMin = 'Su_Mo_Tu_We_Th_Fr_Sa'.split('_');

    function localeWeekdaysMin(m) {
      return m === true ? shiftWeekdays(this._weekdaysMin, this._week.dow) : m ? this._weekdaysMin[m.day()] : this._weekdaysMin;
    }

    function handleStrictParse$1(weekdayName, format, strict) {
      var i,
          ii,
          mom,
          llc = weekdayName.toLocaleLowerCase();

      if (!this._weekdaysParse) {
        this._weekdaysParse = [];
        this._shortWeekdaysParse = [];
        this._minWeekdaysParse = [];

        for (i = 0; i < 7; ++i) {
          mom = createUTC([2000, 1]).day(i);
          this._minWeekdaysParse[i] = this.weekdaysMin(mom, '').toLocaleLowerCase();
          this._shortWeekdaysParse[i] = this.weekdaysShort(mom, '').toLocaleLowerCase();
          this._weekdaysParse[i] = this.weekdays(mom, '').toLocaleLowerCase();
        }
      }

      if (strict) {
        if (format === 'dddd') {
          ii = indexOf.call(this._weekdaysParse, llc);
          return ii !== -1 ? ii : null;
        } else if (format === 'ddd') {
          ii = indexOf.call(this._shortWeekdaysParse, llc);
          return ii !== -1 ? ii : null;
        } else {
          ii = indexOf.call(this._minWeekdaysParse, llc);
          return ii !== -1 ? ii : null;
        }
      } else {
        if (format === 'dddd') {
          ii = indexOf.call(this._weekdaysParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._shortWeekdaysParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._minWeekdaysParse, llc);
          return ii !== -1 ? ii : null;
        } else if (format === 'ddd') {
          ii = indexOf.call(this._shortWeekdaysParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._weekdaysParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._minWeekdaysParse, llc);
          return ii !== -1 ? ii : null;
        } else {
          ii = indexOf.call(this._minWeekdaysParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._weekdaysParse, llc);

          if (ii !== -1) {
            return ii;
          }

          ii = indexOf.call(this._shortWeekdaysParse, llc);
          return ii !== -1 ? ii : null;
        }
      }
    }

    function localeWeekdaysParse(weekdayName, format, strict) {
      var i, mom, regex;

      if (this._weekdaysParseExact) {
        return handleStrictParse$1.call(this, weekdayName, format, strict);
      }

      if (!this._weekdaysParse) {
        this._weekdaysParse = [];
        this._minWeekdaysParse = [];
        this._shortWeekdaysParse = [];
        this._fullWeekdaysParse = [];
      }

      for (i = 0; i < 7; i++) {
        // make the regex if we don't have it already
        mom = createUTC([2000, 1]).day(i);

        if (strict && !this._fullWeekdaysParse[i]) {
          this._fullWeekdaysParse[i] = new RegExp('^' + this.weekdays(mom, '').replace('.', '\\.?') + '$', 'i');
          this._shortWeekdaysParse[i] = new RegExp('^' + this.weekdaysShort(mom, '').replace('.', '\\.?') + '$', 'i');
          this._minWeekdaysParse[i] = new RegExp('^' + this.weekdaysMin(mom, '').replace('.', '\\.?') + '$', 'i');
        }

        if (!this._weekdaysParse[i]) {
          regex = '^' + this.weekdays(mom, '') + '|^' + this.weekdaysShort(mom, '') + '|^' + this.weekdaysMin(mom, '');
          this._weekdaysParse[i] = new RegExp(regex.replace('.', ''), 'i');
        } // test the regex


        if (strict && format === 'dddd' && this._fullWeekdaysParse[i].test(weekdayName)) {
          return i;
        } else if (strict && format === 'ddd' && this._shortWeekdaysParse[i].test(weekdayName)) {
          return i;
        } else if (strict && format === 'dd' && this._minWeekdaysParse[i].test(weekdayName)) {
          return i;
        } else if (!strict && this._weekdaysParse[i].test(weekdayName)) {
          return i;
        }
      }
    } // MOMENTS


    function getSetDayOfWeek(input) {
      if (!this.isValid()) {
        return input != null ? this : NaN;
      }

      var day = this._isUTC ? this._d.getUTCDay() : this._d.getDay();

      if (input != null) {
        input = parseWeekday(input, this.localeData());
        return this.add(input - day, 'd');
      } else {
        return day;
      }
    }

    function getSetLocaleDayOfWeek(input) {
      if (!this.isValid()) {
        return input != null ? this : NaN;
      }

      var weekday = (this.day() + 7 - this.localeData()._week.dow) % 7;
      return input == null ? weekday : this.add(input - weekday, 'd');
    }

    function getSetISODayOfWeek(input) {
      if (!this.isValid()) {
        return input != null ? this : NaN;
      } // behaves the same as moment#day except
      // as a getter, returns 7 instead of 0 (1-7 range instead of 0-6)
      // as a setter, sunday should belong to the previous week.


      if (input != null) {
        var weekday = parseIsoWeekday(input, this.localeData());
        return this.day(this.day() % 7 ? weekday : weekday - 7);
      } else {
        return this.day() || 7;
      }
    }

    var defaultWeekdaysRegex = matchWord;

    function weekdaysRegex(isStrict) {
      if (this._weekdaysParseExact) {
        if (!hasOwnProp(this, '_weekdaysRegex')) {
          computeWeekdaysParse.call(this);
        }

        if (isStrict) {
          return this._weekdaysStrictRegex;
        } else {
          return this._weekdaysRegex;
        }
      } else {
        if (!hasOwnProp(this, '_weekdaysRegex')) {
          this._weekdaysRegex = defaultWeekdaysRegex;
        }

        return this._weekdaysStrictRegex && isStrict ? this._weekdaysStrictRegex : this._weekdaysRegex;
      }
    }

    var defaultWeekdaysShortRegex = matchWord;

    function weekdaysShortRegex(isStrict) {
      if (this._weekdaysParseExact) {
        if (!hasOwnProp(this, '_weekdaysRegex')) {
          computeWeekdaysParse.call(this);
        }

        if (isStrict) {
          return this._weekdaysShortStrictRegex;
        } else {
          return this._weekdaysShortRegex;
        }
      } else {
        if (!hasOwnProp(this, '_weekdaysShortRegex')) {
          this._weekdaysShortRegex = defaultWeekdaysShortRegex;
        }

        return this._weekdaysShortStrictRegex && isStrict ? this._weekdaysShortStrictRegex : this._weekdaysShortRegex;
      }
    }

    var defaultWeekdaysMinRegex = matchWord;

    function weekdaysMinRegex(isStrict) {
      if (this._weekdaysParseExact) {
        if (!hasOwnProp(this, '_weekdaysRegex')) {
          computeWeekdaysParse.call(this);
        }

        if (isStrict) {
          return this._weekdaysMinStrictRegex;
        } else {
          return this._weekdaysMinRegex;
        }
      } else {
        if (!hasOwnProp(this, '_weekdaysMinRegex')) {
          this._weekdaysMinRegex = defaultWeekdaysMinRegex;
        }

        return this._weekdaysMinStrictRegex && isStrict ? this._weekdaysMinStrictRegex : this._weekdaysMinRegex;
      }
    }

    function computeWeekdaysParse() {
      function cmpLenRev(a, b) {
        return b.length - a.length;
      }

      var minPieces = [],
          shortPieces = [],
          longPieces = [],
          mixedPieces = [],
          i,
          mom,
          minp,
          shortp,
          longp;

      for (i = 0; i < 7; i++) {
        // make the regex if we don't have it already
        mom = createUTC([2000, 1]).day(i);
        minp = this.weekdaysMin(mom, '');
        shortp = this.weekdaysShort(mom, '');
        longp = this.weekdays(mom, '');
        minPieces.push(minp);
        shortPieces.push(shortp);
        longPieces.push(longp);
        mixedPieces.push(minp);
        mixedPieces.push(shortp);
        mixedPieces.push(longp);
      } // Sorting makes sure if one weekday (or abbr) is a prefix of another it
      // will match the longer piece.


      minPieces.sort(cmpLenRev);
      shortPieces.sort(cmpLenRev);
      longPieces.sort(cmpLenRev);
      mixedPieces.sort(cmpLenRev);

      for (i = 0; i < 7; i++) {
        shortPieces[i] = regexEscape(shortPieces[i]);
        longPieces[i] = regexEscape(longPieces[i]);
        mixedPieces[i] = regexEscape(mixedPieces[i]);
      }

      this._weekdaysRegex = new RegExp('^(' + mixedPieces.join('|') + ')', 'i');
      this._weekdaysShortRegex = this._weekdaysRegex;
      this._weekdaysMinRegex = this._weekdaysRegex;
      this._weekdaysStrictRegex = new RegExp('^(' + longPieces.join('|') + ')', 'i');
      this._weekdaysShortStrictRegex = new RegExp('^(' + shortPieces.join('|') + ')', 'i');
      this._weekdaysMinStrictRegex = new RegExp('^(' + minPieces.join('|') + ')', 'i');
    } // FORMATTING


    function hFormat() {
      return this.hours() % 12 || 12;
    }

    function kFormat() {
      return this.hours() || 24;
    }

    addFormatToken('H', ['HH', 2], 0, 'hour');
    addFormatToken('h', ['hh', 2], 0, hFormat);
    addFormatToken('k', ['kk', 2], 0, kFormat);
    addFormatToken('hmm', 0, 0, function () {
      return '' + hFormat.apply(this) + zeroFill(this.minutes(), 2);
    });
    addFormatToken('hmmss', 0, 0, function () {
      return '' + hFormat.apply(this) + zeroFill(this.minutes(), 2) + zeroFill(this.seconds(), 2);
    });
    addFormatToken('Hmm', 0, 0, function () {
      return '' + this.hours() + zeroFill(this.minutes(), 2);
    });
    addFormatToken('Hmmss', 0, 0, function () {
      return '' + this.hours() + zeroFill(this.minutes(), 2) + zeroFill(this.seconds(), 2);
    });

    function meridiem(token, lowercase) {
      addFormatToken(token, 0, 0, function () {
        return this.localeData().meridiem(this.hours(), this.minutes(), lowercase);
      });
    }

    meridiem('a', true);
    meridiem('A', false); // ALIASES

    addUnitAlias('hour', 'h'); // PRIORITY

    addUnitPriority('hour', 13); // PARSING

    function matchMeridiem(isStrict, locale) {
      return locale._meridiemParse;
    }

    addRegexToken('a', matchMeridiem);
    addRegexToken('A', matchMeridiem);
    addRegexToken('H', match1to2);
    addRegexToken('h', match1to2);
    addRegexToken('k', match1to2);
    addRegexToken('HH', match1to2, match2);
    addRegexToken('hh', match1to2, match2);
    addRegexToken('kk', match1to2, match2);
    addRegexToken('hmm', match3to4);
    addRegexToken('hmmss', match5to6);
    addRegexToken('Hmm', match3to4);
    addRegexToken('Hmmss', match5to6);
    addParseToken(['H', 'HH'], HOUR);
    addParseToken(['k', 'kk'], function (input, array, config) {
      var kInput = toInt(input);
      array[HOUR] = kInput === 24 ? 0 : kInput;
    });
    addParseToken(['a', 'A'], function (input, array, config) {
      config._isPm = config._locale.isPM(input);
      config._meridiem = input;
    });
    addParseToken(['h', 'hh'], function (input, array, config) {
      array[HOUR] = toInt(input);
      getParsingFlags(config).bigHour = true;
    });
    addParseToken('hmm', function (input, array, config) {
      var pos = input.length - 2;
      array[HOUR] = toInt(input.substr(0, pos));
      array[MINUTE] = toInt(input.substr(pos));
      getParsingFlags(config).bigHour = true;
    });
    addParseToken('hmmss', function (input, array, config) {
      var pos1 = input.length - 4;
      var pos2 = input.length - 2;
      array[HOUR] = toInt(input.substr(0, pos1));
      array[MINUTE] = toInt(input.substr(pos1, 2));
      array[SECOND] = toInt(input.substr(pos2));
      getParsingFlags(config).bigHour = true;
    });
    addParseToken('Hmm', function (input, array, config) {
      var pos = input.length - 2;
      array[HOUR] = toInt(input.substr(0, pos));
      array[MINUTE] = toInt(input.substr(pos));
    });
    addParseToken('Hmmss', function (input, array, config) {
      var pos1 = input.length - 4;
      var pos2 = input.length - 2;
      array[HOUR] = toInt(input.substr(0, pos1));
      array[MINUTE] = toInt(input.substr(pos1, 2));
      array[SECOND] = toInt(input.substr(pos2));
    }); // LOCALES

    function localeIsPM(input) {
      // IE8 Quirks Mode & IE7 Standards Mode do not allow accessing strings like arrays
      // Using charAt should be more compatible.
      return (input + '').toLowerCase().charAt(0) === 'p';
    }

    var defaultLocaleMeridiemParse = /[ap]\.?m?\.?/i;

    function localeMeridiem(hours, minutes, isLower) {
      if (hours > 11) {
        return isLower ? 'pm' : 'PM';
      } else {
        return isLower ? 'am' : 'AM';
      }
    } // MOMENTS
    // Setting the hour should keep the time, because the user explicitly
    // specified which hour they want. So trying to maintain the same hour (in
    // a new timezone) makes sense. Adding/subtracting hours does not follow
    // this rule.


    var getSetHour = makeGetSet('Hours', true);
    var baseConfig = {
      calendar: defaultCalendar,
      longDateFormat: defaultLongDateFormat,
      invalidDate: defaultInvalidDate,
      ordinal: defaultOrdinal,
      dayOfMonthOrdinalParse: defaultDayOfMonthOrdinalParse,
      relativeTime: defaultRelativeTime,
      months: defaultLocaleMonths,
      monthsShort: defaultLocaleMonthsShort,
      week: defaultLocaleWeek,
      weekdays: defaultLocaleWeekdays,
      weekdaysMin: defaultLocaleWeekdaysMin,
      weekdaysShort: defaultLocaleWeekdaysShort,
      meridiemParse: defaultLocaleMeridiemParse
    }; // internal storage for locale config files

    var locales = {};
    var localeFamilies = {};
    var globalLocale;

    function normalizeLocale(key) {
      return key ? key.toLowerCase().replace('_', '-') : key;
    } // pick the locale from the array
    // try ['en-au', 'en-gb'] as 'en-au', 'en-gb', 'en', as in move through the list trying each
    // substring from most specific to least, but move to the next array item if it's a more specific variant than the current root


    function chooseLocale(names) {
      var i = 0,
          j,
          next,
          locale,
          split;

      while (i < names.length) {
        split = normalizeLocale(names[i]).split('-');
        j = split.length;
        next = normalizeLocale(names[i + 1]);
        next = next ? next.split('-') : null;

        while (j > 0) {
          locale = loadLocale(split.slice(0, j).join('-'));

          if (locale) {
            return locale;
          }

          if (next && next.length >= j && compareArrays(split, next, true) >= j - 1) {
            //the next array item is better than a shallower substring of this one
            break;
          }

          j--;
        }

        i++;
      }

      return globalLocale;
    }

    function loadLocale(name) {
      var oldLocale = null; // TODO: Find a better way to register and load all the locales in Node

      if (!locales[name] && 'object' !== 'undefined' && module && module.exports) {
        try {
          oldLocale = globalLocale._abbr;
          var aliasedRequire = commonjsRequire$1;
          aliasedRequire('./locale/' + name);
          getSetGlobalLocale(oldLocale);
        } catch (e) {}
      }

      return locales[name];
    } // This function will load locale and then set the global locale.  If
    // no arguments are passed in, it will simply return the current global
    // locale key.


    function getSetGlobalLocale(key, values) {
      var data;

      if (key) {
        if (isUndefined(values)) {
          data = getLocale(key);
        } else {
          data = defineLocale(key, values);
        }

        if (data) {
          // moment.duration._locale = moment._locale = data;
          globalLocale = data;
        } else {
          if (typeof console !== 'undefined' && console.warn) {
            //warn user if arguments are passed but the locale could not be set
            console.warn('Locale ' + key + ' not found. Did you forget to load it?');
          }
        }
      }

      return globalLocale._abbr;
    }

    function defineLocale(name, config) {
      if (config !== null) {
        var locale,
            parentConfig = baseConfig;
        config.abbr = name;

        if (locales[name] != null) {
          deprecateSimple('defineLocaleOverride', 'use moment.updateLocale(localeName, config) to change ' + 'an existing locale. moment.defineLocale(localeName, ' + 'config) should only be used for creating a new locale ' + 'See http://momentjs.com/guides/#/warnings/define-locale/ for more info.');
          parentConfig = locales[name]._config;
        } else if (config.parentLocale != null) {
          if (locales[config.parentLocale] != null) {
            parentConfig = locales[config.parentLocale]._config;
          } else {
            locale = loadLocale(config.parentLocale);

            if (locale != null) {
              parentConfig = locale._config;
            } else {
              if (!localeFamilies[config.parentLocale]) {
                localeFamilies[config.parentLocale] = [];
              }

              localeFamilies[config.parentLocale].push({
                name: name,
                config: config
              });
              return null;
            }
          }
        }

        locales[name] = new Locale(mergeConfigs(parentConfig, config));

        if (localeFamilies[name]) {
          localeFamilies[name].forEach(function (x) {
            defineLocale(x.name, x.config);
          });
        } // backwards compat for now: also set the locale
        // make sure we set the locale AFTER all child locales have been
        // created, so we won't end up with the child locale set.


        getSetGlobalLocale(name);
        return locales[name];
      } else {
        // useful for testing
        delete locales[name];
        return null;
      }
    }

    function updateLocale(name, config) {
      if (config != null) {
        var locale,
            tmpLocale,
            parentConfig = baseConfig; // MERGE

        tmpLocale = loadLocale(name);

        if (tmpLocale != null) {
          parentConfig = tmpLocale._config;
        }

        config = mergeConfigs(parentConfig, config);
        locale = new Locale(config);
        locale.parentLocale = locales[name];
        locales[name] = locale; // backwards compat for now: also set the locale

        getSetGlobalLocale(name);
      } else {
        // pass null for config to unupdate, useful for tests
        if (locales[name] != null) {
          if (locales[name].parentLocale != null) {
            locales[name] = locales[name].parentLocale;
          } else if (locales[name] != null) {
            delete locales[name];
          }
        }
      }

      return locales[name];
    } // returns locale data


    function getLocale(key) {
      var locale;

      if (key && key._locale && key._locale._abbr) {
        key = key._locale._abbr;
      }

      if (!key) {
        return globalLocale;
      }

      if (!isArray(key)) {
        //short-circuit everything else
        locale = loadLocale(key);

        if (locale) {
          return locale;
        }

        key = [key];
      }

      return chooseLocale(key);
    }

    function listLocales() {
      return keys(locales);
    }

    function checkOverflow(m) {
      var overflow;
      var a = m._a;

      if (a && getParsingFlags(m).overflow === -2) {
        overflow = a[MONTH] < 0 || a[MONTH] > 11 ? MONTH : a[DATE] < 1 || a[DATE] > daysInMonth(a[YEAR], a[MONTH]) ? DATE : a[HOUR] < 0 || a[HOUR] > 24 || a[HOUR] === 24 && (a[MINUTE] !== 0 || a[SECOND] !== 0 || a[MILLISECOND] !== 0) ? HOUR : a[MINUTE] < 0 || a[MINUTE] > 59 ? MINUTE : a[SECOND] < 0 || a[SECOND] > 59 ? SECOND : a[MILLISECOND] < 0 || a[MILLISECOND] > 999 ? MILLISECOND : -1;

        if (getParsingFlags(m)._overflowDayOfYear && (overflow < YEAR || overflow > DATE)) {
          overflow = DATE;
        }

        if (getParsingFlags(m)._overflowWeeks && overflow === -1) {
          overflow = WEEK;
        }

        if (getParsingFlags(m)._overflowWeekday && overflow === -1) {
          overflow = WEEKDAY;
        }

        getParsingFlags(m).overflow = overflow;
      }

      return m;
    } // Pick the first defined of two or three arguments.


    function defaults(a, b, c) {
      if (a != null) {
        return a;
      }

      if (b != null) {
        return b;
      }

      return c;
    }

    function currentDateArray(config) {
      // hooks is actually the exported moment object
      var nowValue = new Date(hooks.now());

      if (config._useUTC) {
        return [nowValue.getUTCFullYear(), nowValue.getUTCMonth(), nowValue.getUTCDate()];
      }

      return [nowValue.getFullYear(), nowValue.getMonth(), nowValue.getDate()];
    } // convert an array to a date.
    // the array should mirror the parameters below
    // note: all values past the year are optional and will default to the lowest possible value.
    // [year, month, day , hour, minute, second, millisecond]


    function configFromArray(config) {
      var i,
          date,
          input = [],
          currentDate,
          expectedWeekday,
          yearToUse;

      if (config._d) {
        return;
      }

      currentDate = currentDateArray(config); //compute day of the year from weeks and weekdays

      if (config._w && config._a[DATE] == null && config._a[MONTH] == null) {
        dayOfYearFromWeekInfo(config);
      } //if the day of the year is set, figure out what it is


      if (config._dayOfYear != null) {
        yearToUse = defaults(config._a[YEAR], currentDate[YEAR]);

        if (config._dayOfYear > daysInYear(yearToUse) || config._dayOfYear === 0) {
          getParsingFlags(config)._overflowDayOfYear = true;
        }

        date = createUTCDate(yearToUse, 0, config._dayOfYear);
        config._a[MONTH] = date.getUTCMonth();
        config._a[DATE] = date.getUTCDate();
      } // Default to current date.
      // * if no year, month, day of month are given, default to today
      // * if day of month is given, default month and year
      // * if month is given, default only year
      // * if year is given, don't default anything


      for (i = 0; i < 3 && config._a[i] == null; ++i) {
        config._a[i] = input[i] = currentDate[i];
      } // Zero out whatever was not defaulted, including time


      for (; i < 7; i++) {
        config._a[i] = input[i] = config._a[i] == null ? i === 2 ? 1 : 0 : config._a[i];
      } // Check for 24:00:00.000


      if (config._a[HOUR] === 24 && config._a[MINUTE] === 0 && config._a[SECOND] === 0 && config._a[MILLISECOND] === 0) {
        config._nextDay = true;
        config._a[HOUR] = 0;
      }

      config._d = (config._useUTC ? createUTCDate : createDate).apply(null, input);
      expectedWeekday = config._useUTC ? config._d.getUTCDay() : config._d.getDay(); // Apply timezone offset from input. The actual utcOffset can be changed
      // with parseZone.

      if (config._tzm != null) {
        config._d.setUTCMinutes(config._d.getUTCMinutes() - config._tzm);
      }

      if (config._nextDay) {
        config._a[HOUR] = 24;
      } // check for mismatching day of week


      if (config._w && typeof config._w.d !== 'undefined' && config._w.d !== expectedWeekday) {
        getParsingFlags(config).weekdayMismatch = true;
      }
    }

    function dayOfYearFromWeekInfo(config) {
      var w, weekYear, week, weekday, dow, doy, temp, weekdayOverflow;
      w = config._w;

      if (w.GG != null || w.W != null || w.E != null) {
        dow = 1;
        doy = 4; // TODO: We need to take the current isoWeekYear, but that depends on
        // how we interpret now (local, utc, fixed offset). So create
        // a now version of current config (take local/utc/offset flags, and
        // create now).

        weekYear = defaults(w.GG, config._a[YEAR], weekOfYear(createLocal(), 1, 4).year);
        week = defaults(w.W, 1);
        weekday = defaults(w.E, 1);

        if (weekday < 1 || weekday > 7) {
          weekdayOverflow = true;
        }
      } else {
        dow = config._locale._week.dow;
        doy = config._locale._week.doy;
        var curWeek = weekOfYear(createLocal(), dow, doy);
        weekYear = defaults(w.gg, config._a[YEAR], curWeek.year); // Default to current week.

        week = defaults(w.w, curWeek.week);

        if (w.d != null) {
          // weekday -- low day numbers are considered next week
          weekday = w.d;

          if (weekday < 0 || weekday > 6) {
            weekdayOverflow = true;
          }
        } else if (w.e != null) {
          // local weekday -- counting starts from beginning of week
          weekday = w.e + dow;

          if (w.e < 0 || w.e > 6) {
            weekdayOverflow = true;
          }
        } else {
          // default to beginning of week
          weekday = dow;
        }
      }

      if (week < 1 || week > weeksInYear(weekYear, dow, doy)) {
        getParsingFlags(config)._overflowWeeks = true;
      } else if (weekdayOverflow != null) {
        getParsingFlags(config)._overflowWeekday = true;
      } else {
        temp = dayOfYearFromWeeks(weekYear, week, weekday, dow, doy);
        config._a[YEAR] = temp.year;
        config._dayOfYear = temp.dayOfYear;
      }
    } // iso 8601 regex
    // 0000-00-00 0000-W00 or 0000-W00-0 + T + 00 or 00:00 or 00:00:00 or 00:00:00.000 + +00:00 or +0000 or +00)


    var extendedIsoRegex = /^\s*((?:[+-]\d{6}|\d{4})-(?:\d\d-\d\d|W\d\d-\d|W\d\d|\d\d\d|\d\d))(?:(T| )(\d\d(?::\d\d(?::\d\d(?:[.,]\d+)?)?)?)([\+\-]\d\d(?::?\d\d)?|\s*Z)?)?$/;
    var basicIsoRegex = /^\s*((?:[+-]\d{6}|\d{4})(?:\d\d\d\d|W\d\d\d|W\d\d|\d\d\d|\d\d))(?:(T| )(\d\d(?:\d\d(?:\d\d(?:[.,]\d+)?)?)?)([\+\-]\d\d(?::?\d\d)?|\s*Z)?)?$/;
    var tzRegex = /Z|[+-]\d\d(?::?\d\d)?/;
    var isoDates = [['YYYYYY-MM-DD', /[+-]\d{6}-\d\d-\d\d/], ['YYYY-MM-DD', /\d{4}-\d\d-\d\d/], ['GGGG-[W]WW-E', /\d{4}-W\d\d-\d/], ['GGGG-[W]WW', /\d{4}-W\d\d/, false], ['YYYY-DDD', /\d{4}-\d{3}/], ['YYYY-MM', /\d{4}-\d\d/, false], ['YYYYYYMMDD', /[+-]\d{10}/], ['YYYYMMDD', /\d{8}/], // YYYYMM is NOT allowed by the standard
    ['GGGG[W]WWE', /\d{4}W\d{3}/], ['GGGG[W]WW', /\d{4}W\d{2}/, false], ['YYYYDDD', /\d{7}/]]; // iso time formats and regexes

    var isoTimes = [['HH:mm:ss.SSSS', /\d\d:\d\d:\d\d\.\d+/], ['HH:mm:ss,SSSS', /\d\d:\d\d:\d\d,\d+/], ['HH:mm:ss', /\d\d:\d\d:\d\d/], ['HH:mm', /\d\d:\d\d/], ['HHmmss.SSSS', /\d\d\d\d\d\d\.\d+/], ['HHmmss,SSSS', /\d\d\d\d\d\d,\d+/], ['HHmmss', /\d\d\d\d\d\d/], ['HHmm', /\d\d\d\d/], ['HH', /\d\d/]];
    var aspNetJsonRegex = /^\/?Date\((\-?\d+)/i; // date from iso format

    function configFromISO(config) {
      var i,
          l,
          string = config._i,
          match = extendedIsoRegex.exec(string) || basicIsoRegex.exec(string),
          allowTime,
          dateFormat,
          timeFormat,
          tzFormat;

      if (match) {
        getParsingFlags(config).iso = true;

        for (i = 0, l = isoDates.length; i < l; i++) {
          if (isoDates[i][1].exec(match[1])) {
            dateFormat = isoDates[i][0];
            allowTime = isoDates[i][2] !== false;
            break;
          }
        }

        if (dateFormat == null) {
          config._isValid = false;
          return;
        }

        if (match[3]) {
          for (i = 0, l = isoTimes.length; i < l; i++) {
            if (isoTimes[i][1].exec(match[3])) {
              // match[2] should be 'T' or space
              timeFormat = (match[2] || ' ') + isoTimes[i][0];
              break;
            }
          }

          if (timeFormat == null) {
            config._isValid = false;
            return;
          }
        }

        if (!allowTime && timeFormat != null) {
          config._isValid = false;
          return;
        }

        if (match[4]) {
          if (tzRegex.exec(match[4])) {
            tzFormat = 'Z';
          } else {
            config._isValid = false;
            return;
          }
        }

        config._f = dateFormat + (timeFormat || '') + (tzFormat || '');
        configFromStringAndFormat(config);
      } else {
        config._isValid = false;
      }
    } // RFC 2822 regex: For details see https://tools.ietf.org/html/rfc2822#section-3.3


    var rfc2822 = /^(?:(Mon|Tue|Wed|Thu|Fri|Sat|Sun),?\s)?(\d{1,2})\s(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s(\d{2,4})\s(\d\d):(\d\d)(?::(\d\d))?\s(?:(UT|GMT|[ECMP][SD]T)|([Zz])|([+-]\d{4}))$/;

    function extractFromRFC2822Strings(yearStr, monthStr, dayStr, hourStr, minuteStr, secondStr) {
      var result = [untruncateYear(yearStr), defaultLocaleMonthsShort.indexOf(monthStr), parseInt(dayStr, 10), parseInt(hourStr, 10), parseInt(minuteStr, 10)];

      if (secondStr) {
        result.push(parseInt(secondStr, 10));
      }

      return result;
    }

    function untruncateYear(yearStr) {
      var year = parseInt(yearStr, 10);

      if (year <= 49) {
        return 2000 + year;
      } else if (year <= 999) {
        return 1900 + year;
      }

      return year;
    }

    function preprocessRFC2822(s) {
      // Remove comments and folding whitespace and replace multiple-spaces with a single space
      return s.replace(/\([^)]*\)|[\n\t]/g, ' ').replace(/(\s\s+)/g, ' ').replace(/^\s\s*/, '').replace(/\s\s*$/, '');
    }

    function checkWeekday(weekdayStr, parsedInput, config) {
      if (weekdayStr) {
        // TODO: Replace the vanilla JS Date object with an indepentent day-of-week check.
        var weekdayProvided = defaultLocaleWeekdaysShort.indexOf(weekdayStr),
            weekdayActual = new Date(parsedInput[0], parsedInput[1], parsedInput[2]).getDay();

        if (weekdayProvided !== weekdayActual) {
          getParsingFlags(config).weekdayMismatch = true;
          config._isValid = false;
          return false;
        }
      }

      return true;
    }

    var obsOffsets = {
      UT: 0,
      GMT: 0,
      EDT: -4 * 60,
      EST: -5 * 60,
      CDT: -5 * 60,
      CST: -6 * 60,
      MDT: -6 * 60,
      MST: -7 * 60,
      PDT: -7 * 60,
      PST: -8 * 60
    };

    function calculateOffset(obsOffset, militaryOffset, numOffset) {
      if (obsOffset) {
        return obsOffsets[obsOffset];
      } else if (militaryOffset) {
        // the only allowed military tz is Z
        return 0;
      } else {
        var hm = parseInt(numOffset, 10);
        var m = hm % 100,
            h = (hm - m) / 100;
        return h * 60 + m;
      }
    } // date and time from ref 2822 format


    function configFromRFC2822(config) {
      var match = rfc2822.exec(preprocessRFC2822(config._i));

      if (match) {
        var parsedArray = extractFromRFC2822Strings(match[4], match[3], match[2], match[5], match[6], match[7]);

        if (!checkWeekday(match[1], parsedArray, config)) {
          return;
        }

        config._a = parsedArray;
        config._tzm = calculateOffset(match[8], match[9], match[10]);
        config._d = createUTCDate.apply(null, config._a);

        config._d.setUTCMinutes(config._d.getUTCMinutes() - config._tzm);

        getParsingFlags(config).rfc2822 = true;
      } else {
        config._isValid = false;
      }
    } // date from iso format or fallback


    function configFromString(config) {
      var matched = aspNetJsonRegex.exec(config._i);

      if (matched !== null) {
        config._d = new Date(+matched[1]);
        return;
      }

      configFromISO(config);

      if (config._isValid === false) {
        delete config._isValid;
      } else {
        return;
      }

      configFromRFC2822(config);

      if (config._isValid === false) {
        delete config._isValid;
      } else {
        return;
      } // Final attempt, use Input Fallback


      hooks.createFromInputFallback(config);
    }

    hooks.createFromInputFallback = deprecate('value provided is not in a recognized RFC2822 or ISO format. moment construction falls back to js Date(), ' + 'which is not reliable across all browsers and versions. Non RFC2822/ISO date formats are ' + 'discouraged and will be removed in an upcoming major release. Please refer to ' + 'http://momentjs.com/guides/#/warnings/js-date/ for more info.', function (config) {
      config._d = new Date(config._i + (config._useUTC ? ' UTC' : ''));
    }); // constant that refers to the ISO standard

    hooks.ISO_8601 = function () {}; // constant that refers to the RFC 2822 form


    hooks.RFC_2822 = function () {}; // date from string and format string


    function configFromStringAndFormat(config) {
      // TODO: Move this to another part of the creation flow to prevent circular deps
      if (config._f === hooks.ISO_8601) {
        configFromISO(config);
        return;
      }

      if (config._f === hooks.RFC_2822) {
        configFromRFC2822(config);
        return;
      }

      config._a = [];
      getParsingFlags(config).empty = true; // This array is used to make a Date, either with `new Date` or `Date.UTC`

      var string = '' + config._i,
          i,
          parsedInput,
          tokens,
          token,
          skipped,
          stringLength = string.length,
          totalParsedInputLength = 0;
      tokens = expandFormat(config._f, config._locale).match(formattingTokens) || [];

      for (i = 0; i < tokens.length; i++) {
        token = tokens[i];
        parsedInput = (string.match(getParseRegexForToken(token, config)) || [])[0]; // console.log('token', token, 'parsedInput', parsedInput,
        //         'regex', getParseRegexForToken(token, config));

        if (parsedInput) {
          skipped = string.substr(0, string.indexOf(parsedInput));

          if (skipped.length > 0) {
            getParsingFlags(config).unusedInput.push(skipped);
          }

          string = string.slice(string.indexOf(parsedInput) + parsedInput.length);
          totalParsedInputLength += parsedInput.length;
        } // don't parse if it's not a known token


        if (formatTokenFunctions[token]) {
          if (parsedInput) {
            getParsingFlags(config).empty = false;
          } else {
            getParsingFlags(config).unusedTokens.push(token);
          }

          addTimeToArrayFromToken(token, parsedInput, config);
        } else if (config._strict && !parsedInput) {
          getParsingFlags(config).unusedTokens.push(token);
        }
      } // add remaining unparsed input length to the string


      getParsingFlags(config).charsLeftOver = stringLength - totalParsedInputLength;

      if (string.length > 0) {
        getParsingFlags(config).unusedInput.push(string);
      } // clear _12h flag if hour is <= 12


      if (config._a[HOUR] <= 12 && getParsingFlags(config).bigHour === true && config._a[HOUR] > 0) {
        getParsingFlags(config).bigHour = undefined;
      }

      getParsingFlags(config).parsedDateParts = config._a.slice(0);
      getParsingFlags(config).meridiem = config._meridiem; // handle meridiem

      config._a[HOUR] = meridiemFixWrap(config._locale, config._a[HOUR], config._meridiem);
      configFromArray(config);
      checkOverflow(config);
    }

    function meridiemFixWrap(locale, hour, meridiem) {
      var isPm;

      if (meridiem == null) {
        // nothing to do
        return hour;
      }

      if (locale.meridiemHour != null) {
        return locale.meridiemHour(hour, meridiem);
      } else if (locale.isPM != null) {
        // Fallback
        isPm = locale.isPM(meridiem);

        if (isPm && hour < 12) {
          hour += 12;
        }

        if (!isPm && hour === 12) {
          hour = 0;
        }

        return hour;
      } else {
        // this is not supposed to happen
        return hour;
      }
    } // date from string and array of format strings


    function configFromStringAndArray(config) {
      var tempConfig, bestMoment, scoreToBeat, i, currentScore;

      if (config._f.length === 0) {
        getParsingFlags(config).invalidFormat = true;
        config._d = new Date(NaN);
        return;
      }

      for (i = 0; i < config._f.length; i++) {
        currentScore = 0;
        tempConfig = copyConfig({}, config);

        if (config._useUTC != null) {
          tempConfig._useUTC = config._useUTC;
        }

        tempConfig._f = config._f[i];
        configFromStringAndFormat(tempConfig);

        if (!isValid(tempConfig)) {
          continue;
        } // if there is any input that was not parsed add a penalty for that format


        currentScore += getParsingFlags(tempConfig).charsLeftOver; //or tokens

        currentScore += getParsingFlags(tempConfig).unusedTokens.length * 10;
        getParsingFlags(tempConfig).score = currentScore;

        if (scoreToBeat == null || currentScore < scoreToBeat) {
          scoreToBeat = currentScore;
          bestMoment = tempConfig;
        }
      }

      extend(config, bestMoment || tempConfig);
    }

    function configFromObject(config) {
      if (config._d) {
        return;
      }

      var i = normalizeObjectUnits(config._i);
      config._a = map([i.year, i.month, i.day || i.date, i.hour, i.minute, i.second, i.millisecond], function (obj) {
        return obj && parseInt(obj, 10);
      });
      configFromArray(config);
    }

    function createFromConfig(config) {
      var res = new Moment(checkOverflow(prepareConfig(config)));

      if (res._nextDay) {
        // Adding is smart enough around DST
        res.add(1, 'd');
        res._nextDay = undefined;
      }

      return res;
    }

    function prepareConfig(config) {
      var input = config._i,
          format = config._f;
      config._locale = config._locale || getLocale(config._l);

      if (input === null || format === undefined && input === '') {
        return createInvalid({
          nullInput: true
        });
      }

      if (typeof input === 'string') {
        config._i = input = config._locale.preparse(input);
      }

      if (isMoment(input)) {
        return new Moment(checkOverflow(input));
      } else if (isDate(input)) {
        config._d = input;
      } else if (isArray(format)) {
        configFromStringAndArray(config);
      } else if (format) {
        configFromStringAndFormat(config);
      } else {
        configFromInput(config);
      }

      if (!isValid(config)) {
        config._d = null;
      }

      return config;
    }

    function configFromInput(config) {
      var input = config._i;

      if (isUndefined(input)) {
        config._d = new Date(hooks.now());
      } else if (isDate(input)) {
        config._d = new Date(input.valueOf());
      } else if (typeof input === 'string') {
        configFromString(config);
      } else if (isArray(input)) {
        config._a = map(input.slice(0), function (obj) {
          return parseInt(obj, 10);
        });
        configFromArray(config);
      } else if (isObject(input)) {
        configFromObject(config);
      } else if (isNumber(input)) {
        // from milliseconds
        config._d = new Date(input);
      } else {
        hooks.createFromInputFallback(config);
      }
    }

    function createLocalOrUTC(input, format, locale, strict, isUTC) {
      var c = {};

      if (locale === true || locale === false) {
        strict = locale;
        locale = undefined;
      }

      if (isObject(input) && isObjectEmpty(input) || isArray(input) && input.length === 0) {
        input = undefined;
      } // object construction must be done this way.
      // https://github.com/moment/moment/issues/1423


      c._isAMomentObject = true;
      c._useUTC = c._isUTC = isUTC;
      c._l = locale;
      c._i = input;
      c._f = format;
      c._strict = strict;
      return createFromConfig(c);
    }

    function createLocal(input, format, locale, strict) {
      return createLocalOrUTC(input, format, locale, strict, false);
    }

    var prototypeMin = deprecate('moment().min is deprecated, use moment.max instead. http://momentjs.com/guides/#/warnings/min-max/', function () {
      var other = createLocal.apply(null, arguments);

      if (this.isValid() && other.isValid()) {
        return other < this ? this : other;
      } else {
        return createInvalid();
      }
    });
    var prototypeMax = deprecate('moment().max is deprecated, use moment.min instead. http://momentjs.com/guides/#/warnings/min-max/', function () {
      var other = createLocal.apply(null, arguments);

      if (this.isValid() && other.isValid()) {
        return other > this ? this : other;
      } else {
        return createInvalid();
      }
    }); // Pick a moment m from moments so that m[fn](other) is true for all
    // other. This relies on the function fn to be transitive.
    //
    // moments should either be an array of moment objects or an array, whose
    // first element is an array of moment objects.

    function pickBy(fn, moments) {
      var res, i;

      if (moments.length === 1 && isArray(moments[0])) {
        moments = moments[0];
      }

      if (!moments.length) {
        return createLocal();
      }

      res = moments[0];

      for (i = 1; i < moments.length; ++i) {
        if (!moments[i].isValid() || moments[i][fn](res)) {
          res = moments[i];
        }
      }

      return res;
    } // TODO: Use [].sort instead?


    function min() {
      var args = [].slice.call(arguments, 0);
      return pickBy('isBefore', args);
    }

    function max() {
      var args = [].slice.call(arguments, 0);
      return pickBy('isAfter', args);
    }

    var now = function () {
      return Date.now ? Date.now() : +new Date();
    };

    var ordering = ['year', 'quarter', 'month', 'week', 'day', 'hour', 'minute', 'second', 'millisecond'];

    function isDurationValid(m) {
      for (var key in m) {
        if (!(indexOf.call(ordering, key) !== -1 && (m[key] == null || !isNaN(m[key])))) {
          return false;
        }
      }

      var unitHasDecimal = false;

      for (var i = 0; i < ordering.length; ++i) {
        if (m[ordering[i]]) {
          if (unitHasDecimal) {
            return false; // only allow non-integers for smallest unit
          }

          if (parseFloat(m[ordering[i]]) !== toInt(m[ordering[i]])) {
            unitHasDecimal = true;
          }
        }
      }

      return true;
    }

    function isValid$1() {
      return this._isValid;
    }

    function createInvalid$1() {
      return createDuration(NaN);
    }

    function Duration(duration) {
      var normalizedInput = normalizeObjectUnits(duration),
          years = normalizedInput.year || 0,
          quarters = normalizedInput.quarter || 0,
          months = normalizedInput.month || 0,
          weeks = normalizedInput.week || normalizedInput.isoWeek || 0,
          days = normalizedInput.day || 0,
          hours = normalizedInput.hour || 0,
          minutes = normalizedInput.minute || 0,
          seconds = normalizedInput.second || 0,
          milliseconds = normalizedInput.millisecond || 0;
      this._isValid = isDurationValid(normalizedInput); // representation for dateAddRemove

      this._milliseconds = +milliseconds + seconds * 1e3 + // 1000
      minutes * 6e4 + // 1000 * 60
      hours * 1000 * 60 * 60; //using 1000 * 60 * 60 instead of 36e5 to avoid floating point rounding errors https://github.com/moment/moment/issues/2978
      // Because of dateAddRemove treats 24 hours as different from a
      // day when working around DST, we need to store them separately

      this._days = +days + weeks * 7; // It is impossible to translate months into days without knowing
      // which months you are are talking about, so we have to store
      // it separately.

      this._months = +months + quarters * 3 + years * 12;
      this._data = {};
      this._locale = getLocale();

      this._bubble();
    }

    function isDuration(obj) {
      return obj instanceof Duration;
    }

    function absRound(number) {
      if (number < 0) {
        return Math.round(-1 * number) * -1;
      } else {
        return Math.round(number);
      }
    } // FORMATTING


    function offset(token, separator) {
      addFormatToken(token, 0, 0, function () {
        var offset = this.utcOffset();
        var sign = '+';

        if (offset < 0) {
          offset = -offset;
          sign = '-';
        }

        return sign + zeroFill(~~(offset / 60), 2) + separator + zeroFill(~~offset % 60, 2);
      });
    }

    offset('Z', ':');
    offset('ZZ', ''); // PARSING

    addRegexToken('Z', matchShortOffset);
    addRegexToken('ZZ', matchShortOffset);
    addParseToken(['Z', 'ZZ'], function (input, array, config) {
      config._useUTC = true;
      config._tzm = offsetFromString(matchShortOffset, input);
    }); // HELPERS
    // timezone chunker
    // '+10:00' > ['10',  '00']
    // '-1530'  > ['-15', '30']

    var chunkOffset = /([\+\-]|\d\d)/gi;

    function offsetFromString(matcher, string) {
      var matches = (string || '').match(matcher);

      if (matches === null) {
        return null;
      }

      var chunk = matches[matches.length - 1] || [];
      var parts = (chunk + '').match(chunkOffset) || ['-', 0, 0];
      var minutes = +(parts[1] * 60) + toInt(parts[2]);
      return minutes === 0 ? 0 : parts[0] === '+' ? minutes : -minutes;
    } // Return a moment from input, that is local/utc/zone equivalent to model.


    function cloneWithOffset(input, model) {
      var res, diff;

      if (model._isUTC) {
        res = model.clone();
        diff = (isMoment(input) || isDate(input) ? input.valueOf() : createLocal(input).valueOf()) - res.valueOf(); // Use low-level api, because this fn is low-level api.

        res._d.setTime(res._d.valueOf() + diff);

        hooks.updateOffset(res, false);
        return res;
      } else {
        return createLocal(input).local();
      }
    }

    function getDateOffset(m) {
      // On Firefox.24 Date#getTimezoneOffset returns a floating point.
      // https://github.com/moment/moment/pull/1871
      return -Math.round(m._d.getTimezoneOffset() / 15) * 15;
    } // HOOKS
    // This function will be called whenever a moment is mutated.
    // It is intended to keep the offset in sync with the timezone.


    hooks.updateOffset = function () {}; // MOMENTS
    // keepLocalTime = true means only change the timezone, without
    // affecting the local hour. So 5:31:26 +0300 --[utcOffset(2, true)]-->
    // 5:31:26 +0200 It is possible that 5:31:26 doesn't exist with offset
    // +0200, so we adjust the time as needed, to be valid.
    //
    // Keeping the time actually adds/subtracts (one hour)
    // from the actual represented time. That is why we call updateOffset
    // a second time. In case it wants us to change the offset again
    // _changeInProgress == true case, then we have to adjust, because
    // there is no such time in the given timezone.


    function getSetOffset(input, keepLocalTime, keepMinutes) {
      var offset = this._offset || 0,
          localAdjust;

      if (!this.isValid()) {
        return input != null ? this : NaN;
      }

      if (input != null) {
        if (typeof input === 'string') {
          input = offsetFromString(matchShortOffset, input);

          if (input === null) {
            return this;
          }
        } else if (Math.abs(input) < 16 && !keepMinutes) {
          input = input * 60;
        }

        if (!this._isUTC && keepLocalTime) {
          localAdjust = getDateOffset(this);
        }

        this._offset = input;
        this._isUTC = true;

        if (localAdjust != null) {
          this.add(localAdjust, 'm');
        }

        if (offset !== input) {
          if (!keepLocalTime || this._changeInProgress) {
            addSubtract(this, createDuration(input - offset, 'm'), 1, false);
          } else if (!this._changeInProgress) {
            this._changeInProgress = true;
            hooks.updateOffset(this, true);
            this._changeInProgress = null;
          }
        }

        return this;
      } else {
        return this._isUTC ? offset : getDateOffset(this);
      }
    }

    function getSetZone(input, keepLocalTime) {
      if (input != null) {
        if (typeof input !== 'string') {
          input = -input;
        }

        this.utcOffset(input, keepLocalTime);
        return this;
      } else {
        return -this.utcOffset();
      }
    }

    function setOffsetToUTC(keepLocalTime) {
      return this.utcOffset(0, keepLocalTime);
    }

    function setOffsetToLocal(keepLocalTime) {
      if (this._isUTC) {
        this.utcOffset(0, keepLocalTime);
        this._isUTC = false;

        if (keepLocalTime) {
          this.subtract(getDateOffset(this), 'm');
        }
      }

      return this;
    }

    function setOffsetToParsedOffset() {
      if (this._tzm != null) {
        this.utcOffset(this._tzm, false, true);
      } else if (typeof this._i === 'string') {
        var tZone = offsetFromString(matchOffset, this._i);

        if (tZone != null) {
          this.utcOffset(tZone);
        } else {
          this.utcOffset(0, true);
        }
      }

      return this;
    }

    function hasAlignedHourOffset(input) {
      if (!this.isValid()) {
        return false;
      }

      input = input ? createLocal(input).utcOffset() : 0;
      return (this.utcOffset() - input) % 60 === 0;
    }

    function isDaylightSavingTime() {
      return this.utcOffset() > this.clone().month(0).utcOffset() || this.utcOffset() > this.clone().month(5).utcOffset();
    }

    function isDaylightSavingTimeShifted() {
      if (!isUndefined(this._isDSTShifted)) {
        return this._isDSTShifted;
      }

      var c = {};
      copyConfig(c, this);
      c = prepareConfig(c);

      if (c._a) {
        var other = c._isUTC ? createUTC(c._a) : createLocal(c._a);
        this._isDSTShifted = this.isValid() && compareArrays(c._a, other.toArray()) > 0;
      } else {
        this._isDSTShifted = false;
      }

      return this._isDSTShifted;
    }

    function isLocal() {
      return this.isValid() ? !this._isUTC : false;
    }

    function isUtcOffset() {
      return this.isValid() ? this._isUTC : false;
    }

    function isUtc() {
      return this.isValid() ? this._isUTC && this._offset === 0 : false;
    } // ASP.NET json date format regex


    var aspNetRegex = /^(\-|\+)?(?:(\d*)[. ])?(\d+)\:(\d+)(?:\:(\d+)(\.\d*)?)?$/; // from http://docs.closure-library.googlecode.com/git/closure_goog_date_date.js.source.html
    // somewhat more in line with 4.4.3.2 2004 spec, but allows decimal anywhere
    // and further modified to allow for strings containing both week and day

    var isoRegex = /^(-|\+)?P(?:([-+]?[0-9,.]*)Y)?(?:([-+]?[0-9,.]*)M)?(?:([-+]?[0-9,.]*)W)?(?:([-+]?[0-9,.]*)D)?(?:T(?:([-+]?[0-9,.]*)H)?(?:([-+]?[0-9,.]*)M)?(?:([-+]?[0-9,.]*)S)?)?$/;

    function createDuration(input, key) {
      var duration = input,
          // matching against regexp is expensive, do it on demand
      match = null,
          sign,
          ret,
          diffRes;

      if (isDuration(input)) {
        duration = {
          ms: input._milliseconds,
          d: input._days,
          M: input._months
        };
      } else if (isNumber(input)) {
        duration = {};

        if (key) {
          duration[key] = input;
        } else {
          duration.milliseconds = input;
        }
      } else if (!!(match = aspNetRegex.exec(input))) {
        sign = match[1] === '-' ? -1 : 1;
        duration = {
          y: 0,
          d: toInt(match[DATE]) * sign,
          h: toInt(match[HOUR]) * sign,
          m: toInt(match[MINUTE]) * sign,
          s: toInt(match[SECOND]) * sign,
          ms: toInt(absRound(match[MILLISECOND] * 1000)) * sign // the millisecond decimal point is included in the match

        };
      } else if (!!(match = isoRegex.exec(input))) {
        sign = match[1] === '-' ? -1 : 1;
        duration = {
          y: parseIso(match[2], sign),
          M: parseIso(match[3], sign),
          w: parseIso(match[4], sign),
          d: parseIso(match[5], sign),
          h: parseIso(match[6], sign),
          m: parseIso(match[7], sign),
          s: parseIso(match[8], sign)
        };
      } else if (duration == null) {
        // checks for null or undefined
        duration = {};
      } else if (typeof duration === 'object' && ('from' in duration || 'to' in duration)) {
        diffRes = momentsDifference(createLocal(duration.from), createLocal(duration.to));
        duration = {};
        duration.ms = diffRes.milliseconds;
        duration.M = diffRes.months;
      }

      ret = new Duration(duration);

      if (isDuration(input) && hasOwnProp(input, '_locale')) {
        ret._locale = input._locale;
      }

      return ret;
    }

    createDuration.fn = Duration.prototype;
    createDuration.invalid = createInvalid$1;

    function parseIso(inp, sign) {
      // We'd normally use ~~inp for this, but unfortunately it also
      // converts floats to ints.
      // inp may be undefined, so careful calling replace on it.
      var res = inp && parseFloat(inp.replace(',', '.')); // apply sign while we're at it

      return (isNaN(res) ? 0 : res) * sign;
    }

    function positiveMomentsDifference(base, other) {
      var res = {};
      res.months = other.month() - base.month() + (other.year() - base.year()) * 12;

      if (base.clone().add(res.months, 'M').isAfter(other)) {
        --res.months;
      }

      res.milliseconds = +other - +base.clone().add(res.months, 'M');
      return res;
    }

    function momentsDifference(base, other) {
      var res;

      if (!(base.isValid() && other.isValid())) {
        return {
          milliseconds: 0,
          months: 0
        };
      }

      other = cloneWithOffset(other, base);

      if (base.isBefore(other)) {
        res = positiveMomentsDifference(base, other);
      } else {
        res = positiveMomentsDifference(other, base);
        res.milliseconds = -res.milliseconds;
        res.months = -res.months;
      }

      return res;
    } // TODO: remove 'name' arg after deprecation is removed


    function createAdder(direction, name) {
      return function (val, period) {
        var dur, tmp; //invert the arguments, but complain about it

        if (period !== null && !isNaN(+period)) {
          deprecateSimple(name, 'moment().' + name + '(period, number) is deprecated. Please use moment().' + name + '(number, period). ' + 'See http://momentjs.com/guides/#/warnings/add-inverted-param/ for more info.');
          tmp = val;
          val = period;
          period = tmp;
        }

        val = typeof val === 'string' ? +val : val;
        dur = createDuration(val, period);
        addSubtract(this, dur, direction);
        return this;
      };
    }

    function addSubtract(mom, duration, isAdding, updateOffset) {
      var milliseconds = duration._milliseconds,
          days = absRound(duration._days),
          months = absRound(duration._months);

      if (!mom.isValid()) {
        // No op
        return;
      }

      updateOffset = updateOffset == null ? true : updateOffset;

      if (months) {
        setMonth(mom, get(mom, 'Month') + months * isAdding);
      }

      if (days) {
        set$1(mom, 'Date', get(mom, 'Date') + days * isAdding);
      }

      if (milliseconds) {
        mom._d.setTime(mom._d.valueOf() + milliseconds * isAdding);
      }

      if (updateOffset) {
        hooks.updateOffset(mom, days || months);
      }
    }

    var add = createAdder(1, 'add');
    var subtract = createAdder(-1, 'subtract');

    function getCalendarFormat(myMoment, now) {
      var diff = myMoment.diff(now, 'days', true);
      return diff < -6 ? 'sameElse' : diff < -1 ? 'lastWeek' : diff < 0 ? 'lastDay' : diff < 1 ? 'sameDay' : diff < 2 ? 'nextDay' : diff < 7 ? 'nextWeek' : 'sameElse';
    }

    function calendar$1(time, formats) {
      // We want to compare the start of today, vs this.
      // Getting start-of-today depends on whether we're local/utc/offset or not.
      var now = time || createLocal(),
          sod = cloneWithOffset(now, this).startOf('day'),
          format = hooks.calendarFormat(this, sod) || 'sameElse';
      var output = formats && (isFunction(formats[format]) ? formats[format].call(this, now) : formats[format]);
      return this.format(output || this.localeData().calendar(format, this, createLocal(now)));
    }

    function clone() {
      return new Moment(this);
    }

    function isAfter(input, units) {
      var localInput = isMoment(input) ? input : createLocal(input);

      if (!(this.isValid() && localInput.isValid())) {
        return false;
      }

      units = normalizeUnits(units) || 'millisecond';

      if (units === 'millisecond') {
        return this.valueOf() > localInput.valueOf();
      } else {
        return localInput.valueOf() < this.clone().startOf(units).valueOf();
      }
    }

    function isBefore(input, units) {
      var localInput = isMoment(input) ? input : createLocal(input);

      if (!(this.isValid() && localInput.isValid())) {
        return false;
      }

      units = normalizeUnits(units) || 'millisecond';

      if (units === 'millisecond') {
        return this.valueOf() < localInput.valueOf();
      } else {
        return this.clone().endOf(units).valueOf() < localInput.valueOf();
      }
    }

    function isBetween(from, to, units, inclusivity) {
      var localFrom = isMoment(from) ? from : createLocal(from),
          localTo = isMoment(to) ? to : createLocal(to);

      if (!(this.isValid() && localFrom.isValid() && localTo.isValid())) {
        return false;
      }

      inclusivity = inclusivity || '()';
      return (inclusivity[0] === '(' ? this.isAfter(localFrom, units) : !this.isBefore(localFrom, units)) && (inclusivity[1] === ')' ? this.isBefore(localTo, units) : !this.isAfter(localTo, units));
    }

    function isSame(input, units) {
      var localInput = isMoment(input) ? input : createLocal(input),
          inputMs;

      if (!(this.isValid() && localInput.isValid())) {
        return false;
      }

      units = normalizeUnits(units) || 'millisecond';

      if (units === 'millisecond') {
        return this.valueOf() === localInput.valueOf();
      } else {
        inputMs = localInput.valueOf();
        return this.clone().startOf(units).valueOf() <= inputMs && inputMs <= this.clone().endOf(units).valueOf();
      }
    }

    function isSameOrAfter(input, units) {
      return this.isSame(input, units) || this.isAfter(input, units);
    }

    function isSameOrBefore(input, units) {
      return this.isSame(input, units) || this.isBefore(input, units);
    }

    function diff(input, units, asFloat) {
      var that, zoneDelta, output;

      if (!this.isValid()) {
        return NaN;
      }

      that = cloneWithOffset(input, this);

      if (!that.isValid()) {
        return NaN;
      }

      zoneDelta = (that.utcOffset() - this.utcOffset()) * 6e4;
      units = normalizeUnits(units);

      switch (units) {
        case 'year':
          output = monthDiff(this, that) / 12;
          break;

        case 'month':
          output = monthDiff(this, that);
          break;

        case 'quarter':
          output = monthDiff(this, that) / 3;
          break;

        case 'second':
          output = (this - that) / 1e3;
          break;
        // 1000

        case 'minute':
          output = (this - that) / 6e4;
          break;
        // 1000 * 60

        case 'hour':
          output = (this - that) / 36e5;
          break;
        // 1000 * 60 * 60

        case 'day':
          output = (this - that - zoneDelta) / 864e5;
          break;
        // 1000 * 60 * 60 * 24, negate dst

        case 'week':
          output = (this - that - zoneDelta) / 6048e5;
          break;
        // 1000 * 60 * 60 * 24 * 7, negate dst

        default:
          output = this - that;
      }

      return asFloat ? output : absFloor(output);
    }

    function monthDiff(a, b) {
      // difference in months
      var wholeMonthDiff = (b.year() - a.year()) * 12 + (b.month() - a.month()),
          // b is in (anchor - 1 month, anchor + 1 month)
      anchor = a.clone().add(wholeMonthDiff, 'months'),
          anchor2,
          adjust;

      if (b - anchor < 0) {
        anchor2 = a.clone().add(wholeMonthDiff - 1, 'months'); // linear across the month

        adjust = (b - anchor) / (anchor - anchor2);
      } else {
        anchor2 = a.clone().add(wholeMonthDiff + 1, 'months'); // linear across the month

        adjust = (b - anchor) / (anchor2 - anchor);
      } //check for negative zero, return zero if negative zero


      return -(wholeMonthDiff + adjust) || 0;
    }

    hooks.defaultFormat = 'YYYY-MM-DDTHH:mm:ssZ';
    hooks.defaultFormatUtc = 'YYYY-MM-DDTHH:mm:ss[Z]';

    function toString() {
      return this.clone().locale('en').format('ddd MMM DD YYYY HH:mm:ss [GMT]ZZ');
    }

    function toISOString(keepOffset) {
      if (!this.isValid()) {
        return null;
      }

      var utc = keepOffset !== true;
      var m = utc ? this.clone().utc() : this;

      if (m.year() < 0 || m.year() > 9999) {
        return formatMoment(m, utc ? 'YYYYYY-MM-DD[T]HH:mm:ss.SSS[Z]' : 'YYYYYY-MM-DD[T]HH:mm:ss.SSSZ');
      }

      if (isFunction(Date.prototype.toISOString)) {
        // native implementation is ~50x faster, use it when we can
        if (utc) {
          return this.toDate().toISOString();
        } else {
          return new Date(this.valueOf() + this.utcOffset() * 60 * 1000).toISOString().replace('Z', formatMoment(m, 'Z'));
        }
      }

      return formatMoment(m, utc ? 'YYYY-MM-DD[T]HH:mm:ss.SSS[Z]' : 'YYYY-MM-DD[T]HH:mm:ss.SSSZ');
    }
    /**
     * Return a human readable representation of a moment that can
     * also be evaluated to get a new moment which is the same
     *
     * @link https://nodejs.org/dist/latest/docs/api/util.html#util_custom_inspect_function_on_objects
     */


    function inspect() {
      if (!this.isValid()) {
        return 'moment.invalid(/* ' + this._i + ' */)';
      }

      var func = 'moment';
      var zone = '';

      if (!this.isLocal()) {
        func = this.utcOffset() === 0 ? 'moment.utc' : 'moment.parseZone';
        zone = 'Z';
      }

      var prefix = '[' + func + '("]';
      var year = 0 <= this.year() && this.year() <= 9999 ? 'YYYY' : 'YYYYYY';
      var datetime = '-MM-DD[T]HH:mm:ss.SSS';
      var suffix = zone + '[")]';
      return this.format(prefix + year + datetime + suffix);
    }

    function format(inputString) {
      if (!inputString) {
        inputString = this.isUtc() ? hooks.defaultFormatUtc : hooks.defaultFormat;
      }

      var output = formatMoment(this, inputString);
      return this.localeData().postformat(output);
    }

    function from(time, withoutSuffix) {
      if (this.isValid() && (isMoment(time) && time.isValid() || createLocal(time).isValid())) {
        return createDuration({
          to: this,
          from: time
        }).locale(this.locale()).humanize(!withoutSuffix);
      } else {
        return this.localeData().invalidDate();
      }
    }

    function fromNow(withoutSuffix) {
      return this.from(createLocal(), withoutSuffix);
    }

    function to(time, withoutSuffix) {
      if (this.isValid() && (isMoment(time) && time.isValid() || createLocal(time).isValid())) {
        return createDuration({
          from: this,
          to: time
        }).locale(this.locale()).humanize(!withoutSuffix);
      } else {
        return this.localeData().invalidDate();
      }
    }

    function toNow(withoutSuffix) {
      return this.to(createLocal(), withoutSuffix);
    } // If passed a locale key, it will set the locale for this
    // instance.  Otherwise, it will return the locale configuration
    // variables for this instance.


    function locale(key) {
      var newLocaleData;

      if (key === undefined) {
        return this._locale._abbr;
      } else {
        newLocaleData = getLocale(key);

        if (newLocaleData != null) {
          this._locale = newLocaleData;
        }

        return this;
      }
    }

    var lang = deprecate('moment().lang() is deprecated. Instead, use moment().localeData() to get the language configuration. Use moment().locale() to change languages.', function (key) {
      if (key === undefined) {
        return this.localeData();
      } else {
        return this.locale(key);
      }
    });

    function localeData() {
      return this._locale;
    }

    var MS_PER_SECOND = 1000;
    var MS_PER_MINUTE = 60 * MS_PER_SECOND;
    var MS_PER_HOUR = 60 * MS_PER_MINUTE;
    var MS_PER_400_YEARS = (365 * 400 + 97) * 24 * MS_PER_HOUR; // actual modulo - handles negative numbers (for dates before 1970):

    function mod$1(dividend, divisor) {
      return (dividend % divisor + divisor) % divisor;
    }

    function localStartOfDate(y, m, d) {
      // the date constructor remaps years 0-99 to 1900-1999
      if (y < 100 && y >= 0) {
        // preserve leap years using a full 400 year cycle, then reset
        return new Date(y + 400, m, d) - MS_PER_400_YEARS;
      } else {
        return new Date(y, m, d).valueOf();
      }
    }

    function utcStartOfDate(y, m, d) {
      // Date.UTC remaps years 0-99 to 1900-1999
      if (y < 100 && y >= 0) {
        // preserve leap years using a full 400 year cycle, then reset
        return Date.UTC(y + 400, m, d) - MS_PER_400_YEARS;
      } else {
        return Date.UTC(y, m, d);
      }
    }

    function startOf(units) {
      var time;
      units = normalizeUnits(units);

      if (units === undefined || units === 'millisecond' || !this.isValid()) {
        return this;
      }

      var startOfDate = this._isUTC ? utcStartOfDate : localStartOfDate;

      switch (units) {
        case 'year':
          time = startOfDate(this.year(), 0, 1);
          break;

        case 'quarter':
          time = startOfDate(this.year(), this.month() - this.month() % 3, 1);
          break;

        case 'month':
          time = startOfDate(this.year(), this.month(), 1);
          break;

        case 'week':
          time = startOfDate(this.year(), this.month(), this.date() - this.weekday());
          break;

        case 'isoWeek':
          time = startOfDate(this.year(), this.month(), this.date() - (this.isoWeekday() - 1));
          break;

        case 'day':
        case 'date':
          time = startOfDate(this.year(), this.month(), this.date());
          break;

        case 'hour':
          time = this._d.valueOf();
          time -= mod$1(time + (this._isUTC ? 0 : this.utcOffset() * MS_PER_MINUTE), MS_PER_HOUR);
          break;

        case 'minute':
          time = this._d.valueOf();
          time -= mod$1(time, MS_PER_MINUTE);
          break;

        case 'second':
          time = this._d.valueOf();
          time -= mod$1(time, MS_PER_SECOND);
          break;
      }

      this._d.setTime(time);

      hooks.updateOffset(this, true);
      return this;
    }

    function endOf(units) {
      var time;
      units = normalizeUnits(units);

      if (units === undefined || units === 'millisecond' || !this.isValid()) {
        return this;
      }

      var startOfDate = this._isUTC ? utcStartOfDate : localStartOfDate;

      switch (units) {
        case 'year':
          time = startOfDate(this.year() + 1, 0, 1) - 1;
          break;

        case 'quarter':
          time = startOfDate(this.year(), this.month() - this.month() % 3 + 3, 1) - 1;
          break;

        case 'month':
          time = startOfDate(this.year(), this.month() + 1, 1) - 1;
          break;

        case 'week':
          time = startOfDate(this.year(), this.month(), this.date() - this.weekday() + 7) - 1;
          break;

        case 'isoWeek':
          time = startOfDate(this.year(), this.month(), this.date() - (this.isoWeekday() - 1) + 7) - 1;
          break;

        case 'day':
        case 'date':
          time = startOfDate(this.year(), this.month(), this.date() + 1) - 1;
          break;

        case 'hour':
          time = this._d.valueOf();
          time += MS_PER_HOUR - mod$1(time + (this._isUTC ? 0 : this.utcOffset() * MS_PER_MINUTE), MS_PER_HOUR) - 1;
          break;

        case 'minute':
          time = this._d.valueOf();
          time += MS_PER_MINUTE - mod$1(time, MS_PER_MINUTE) - 1;
          break;

        case 'second':
          time = this._d.valueOf();
          time += MS_PER_SECOND - mod$1(time, MS_PER_SECOND) - 1;
          break;
      }

      this._d.setTime(time);

      hooks.updateOffset(this, true);
      return this;
    }

    function valueOf() {
      return this._d.valueOf() - (this._offset || 0) * 60000;
    }

    function unix() {
      return Math.floor(this.valueOf() / 1000);
    }

    function toDate() {
      return new Date(this.valueOf());
    }

    function toArray() {
      var m = this;
      return [m.year(), m.month(), m.date(), m.hour(), m.minute(), m.second(), m.millisecond()];
    }

    function toObject() {
      var m = this;
      return {
        years: m.year(),
        months: m.month(),
        date: m.date(),
        hours: m.hours(),
        minutes: m.minutes(),
        seconds: m.seconds(),
        milliseconds: m.milliseconds()
      };
    }

    function toJSON() {
      // new Date(NaN).toJSON() === null
      return this.isValid() ? this.toISOString() : null;
    }

    function isValid$2() {
      return isValid(this);
    }

    function parsingFlags() {
      return extend({}, getParsingFlags(this));
    }

    function invalidAt() {
      return getParsingFlags(this).overflow;
    }

    function creationData() {
      return {
        input: this._i,
        format: this._f,
        locale: this._locale,
        isUTC: this._isUTC,
        strict: this._strict
      };
    } // FORMATTING


    addFormatToken(0, ['gg', 2], 0, function () {
      return this.weekYear() % 100;
    });
    addFormatToken(0, ['GG', 2], 0, function () {
      return this.isoWeekYear() % 100;
    });

    function addWeekYearFormatToken(token, getter) {
      addFormatToken(0, [token, token.length], 0, getter);
    }

    addWeekYearFormatToken('gggg', 'weekYear');
    addWeekYearFormatToken('ggggg', 'weekYear');
    addWeekYearFormatToken('GGGG', 'isoWeekYear');
    addWeekYearFormatToken('GGGGG', 'isoWeekYear'); // ALIASES

    addUnitAlias('weekYear', 'gg');
    addUnitAlias('isoWeekYear', 'GG'); // PRIORITY

    addUnitPriority('weekYear', 1);
    addUnitPriority('isoWeekYear', 1); // PARSING

    addRegexToken('G', matchSigned);
    addRegexToken('g', matchSigned);
    addRegexToken('GG', match1to2, match2);
    addRegexToken('gg', match1to2, match2);
    addRegexToken('GGGG', match1to4, match4);
    addRegexToken('gggg', match1to4, match4);
    addRegexToken('GGGGG', match1to6, match6);
    addRegexToken('ggggg', match1to6, match6);
    addWeekParseToken(['gggg', 'ggggg', 'GGGG', 'GGGGG'], function (input, week, config, token) {
      week[token.substr(0, 2)] = toInt(input);
    });
    addWeekParseToken(['gg', 'GG'], function (input, week, config, token) {
      week[token] = hooks.parseTwoDigitYear(input);
    }); // MOMENTS

    function getSetWeekYear(input) {
      return getSetWeekYearHelper.call(this, input, this.week(), this.weekday(), this.localeData()._week.dow, this.localeData()._week.doy);
    }

    function getSetISOWeekYear(input) {
      return getSetWeekYearHelper.call(this, input, this.isoWeek(), this.isoWeekday(), 1, 4);
    }

    function getISOWeeksInYear() {
      return weeksInYear(this.year(), 1, 4);
    }

    function getWeeksInYear() {
      var weekInfo = this.localeData()._week;

      return weeksInYear(this.year(), weekInfo.dow, weekInfo.doy);
    }

    function getSetWeekYearHelper(input, week, weekday, dow, doy) {
      var weeksTarget;

      if (input == null) {
        return weekOfYear(this, dow, doy).year;
      } else {
        weeksTarget = weeksInYear(input, dow, doy);

        if (week > weeksTarget) {
          week = weeksTarget;
        }

        return setWeekAll.call(this, input, week, weekday, dow, doy);
      }
    }

    function setWeekAll(weekYear, week, weekday, dow, doy) {
      var dayOfYearData = dayOfYearFromWeeks(weekYear, week, weekday, dow, doy),
          date = createUTCDate(dayOfYearData.year, 0, dayOfYearData.dayOfYear);
      this.year(date.getUTCFullYear());
      this.month(date.getUTCMonth());
      this.date(date.getUTCDate());
      return this;
    } // FORMATTING


    addFormatToken('Q', 0, 'Qo', 'quarter'); // ALIASES

    addUnitAlias('quarter', 'Q'); // PRIORITY

    addUnitPriority('quarter', 7); // PARSING

    addRegexToken('Q', match1);
    addParseToken('Q', function (input, array) {
      array[MONTH] = (toInt(input) - 1) * 3;
    }); // MOMENTS

    function getSetQuarter(input) {
      return input == null ? Math.ceil((this.month() + 1) / 3) : this.month((input - 1) * 3 + this.month() % 3);
    } // FORMATTING


    addFormatToken('D', ['DD', 2], 'Do', 'date'); // ALIASES

    addUnitAlias('date', 'D'); // PRIORITY

    addUnitPriority('date', 9); // PARSING

    addRegexToken('D', match1to2);
    addRegexToken('DD', match1to2, match2);
    addRegexToken('Do', function (isStrict, locale) {
      // TODO: Remove "ordinalParse" fallback in next major release.
      return isStrict ? locale._dayOfMonthOrdinalParse || locale._ordinalParse : locale._dayOfMonthOrdinalParseLenient;
    });
    addParseToken(['D', 'DD'], DATE);
    addParseToken('Do', function (input, array) {
      array[DATE] = toInt(input.match(match1to2)[0]);
    }); // MOMENTS

    var getSetDayOfMonth = makeGetSet('Date', true); // FORMATTING

    addFormatToken('DDD', ['DDDD', 3], 'DDDo', 'dayOfYear'); // ALIASES

    addUnitAlias('dayOfYear', 'DDD'); // PRIORITY

    addUnitPriority('dayOfYear', 4); // PARSING

    addRegexToken('DDD', match1to3);
    addRegexToken('DDDD', match3);
    addParseToken(['DDD', 'DDDD'], function (input, array, config) {
      config._dayOfYear = toInt(input);
    }); // HELPERS
    // MOMENTS

    function getSetDayOfYear(input) {
      var dayOfYear = Math.round((this.clone().startOf('day') - this.clone().startOf('year')) / 864e5) + 1;
      return input == null ? dayOfYear : this.add(input - dayOfYear, 'd');
    } // FORMATTING


    addFormatToken('m', ['mm', 2], 0, 'minute'); // ALIASES

    addUnitAlias('minute', 'm'); // PRIORITY

    addUnitPriority('minute', 14); // PARSING

    addRegexToken('m', match1to2);
    addRegexToken('mm', match1to2, match2);
    addParseToken(['m', 'mm'], MINUTE); // MOMENTS

    var getSetMinute = makeGetSet('Minutes', false); // FORMATTING

    addFormatToken('s', ['ss', 2], 0, 'second'); // ALIASES

    addUnitAlias('second', 's'); // PRIORITY

    addUnitPriority('second', 15); // PARSING

    addRegexToken('s', match1to2);
    addRegexToken('ss', match1to2, match2);
    addParseToken(['s', 'ss'], SECOND); // MOMENTS

    var getSetSecond = makeGetSet('Seconds', false); // FORMATTING

    addFormatToken('S', 0, 0, function () {
      return ~~(this.millisecond() / 100);
    });
    addFormatToken(0, ['SS', 2], 0, function () {
      return ~~(this.millisecond() / 10);
    });
    addFormatToken(0, ['SSS', 3], 0, 'millisecond');
    addFormatToken(0, ['SSSS', 4], 0, function () {
      return this.millisecond() * 10;
    });
    addFormatToken(0, ['SSSSS', 5], 0, function () {
      return this.millisecond() * 100;
    });
    addFormatToken(0, ['SSSSSS', 6], 0, function () {
      return this.millisecond() * 1000;
    });
    addFormatToken(0, ['SSSSSSS', 7], 0, function () {
      return this.millisecond() * 10000;
    });
    addFormatToken(0, ['SSSSSSSS', 8], 0, function () {
      return this.millisecond() * 100000;
    });
    addFormatToken(0, ['SSSSSSSSS', 9], 0, function () {
      return this.millisecond() * 1000000;
    }); // ALIASES

    addUnitAlias('millisecond', 'ms'); // PRIORITY

    addUnitPriority('millisecond', 16); // PARSING

    addRegexToken('S', match1to3, match1);
    addRegexToken('SS', match1to3, match2);
    addRegexToken('SSS', match1to3, match3);
    var token;

    for (token = 'SSSS'; token.length <= 9; token += 'S') {
      addRegexToken(token, matchUnsigned);
    }

    function parseMs(input, array) {
      array[MILLISECOND] = toInt(('0.' + input) * 1000);
    }

    for (token = 'S'; token.length <= 9; token += 'S') {
      addParseToken(token, parseMs);
    } // MOMENTS


    var getSetMillisecond = makeGetSet('Milliseconds', false); // FORMATTING

    addFormatToken('z', 0, 0, 'zoneAbbr');
    addFormatToken('zz', 0, 0, 'zoneName'); // MOMENTS

    function getZoneAbbr() {
      return this._isUTC ? 'UTC' : '';
    }

    function getZoneName() {
      return this._isUTC ? 'Coordinated Universal Time' : '';
    }

    var proto = Moment.prototype;
    proto.add = add;
    proto.calendar = calendar$1;
    proto.clone = clone;
    proto.diff = diff;
    proto.endOf = endOf;
    proto.format = format;
    proto.from = from;
    proto.fromNow = fromNow;
    proto.to = to;
    proto.toNow = toNow;
    proto.get = stringGet;
    proto.invalidAt = invalidAt;
    proto.isAfter = isAfter;
    proto.isBefore = isBefore;
    proto.isBetween = isBetween;
    proto.isSame = isSame;
    proto.isSameOrAfter = isSameOrAfter;
    proto.isSameOrBefore = isSameOrBefore;
    proto.isValid = isValid$2;
    proto.lang = lang;
    proto.locale = locale;
    proto.localeData = localeData;
    proto.max = prototypeMax;
    proto.min = prototypeMin;
    proto.parsingFlags = parsingFlags;
    proto.set = stringSet;
    proto.startOf = startOf;
    proto.subtract = subtract;
    proto.toArray = toArray;
    proto.toObject = toObject;
    proto.toDate = toDate;
    proto.toISOString = toISOString;
    proto.inspect = inspect;
    proto.toJSON = toJSON;
    proto.toString = toString;
    proto.unix = unix;
    proto.valueOf = valueOf;
    proto.creationData = creationData;
    proto.year = getSetYear;
    proto.isLeapYear = getIsLeapYear;
    proto.weekYear = getSetWeekYear;
    proto.isoWeekYear = getSetISOWeekYear;
    proto.quarter = proto.quarters = getSetQuarter;
    proto.month = getSetMonth;
    proto.daysInMonth = getDaysInMonth;
    proto.week = proto.weeks = getSetWeek;
    proto.isoWeek = proto.isoWeeks = getSetISOWeek;
    proto.weeksInYear = getWeeksInYear;
    proto.isoWeeksInYear = getISOWeeksInYear;
    proto.date = getSetDayOfMonth;
    proto.day = proto.days = getSetDayOfWeek;
    proto.weekday = getSetLocaleDayOfWeek;
    proto.isoWeekday = getSetISODayOfWeek;
    proto.dayOfYear = getSetDayOfYear;
    proto.hour = proto.hours = getSetHour;
    proto.minute = proto.minutes = getSetMinute;
    proto.second = proto.seconds = getSetSecond;
    proto.millisecond = proto.milliseconds = getSetMillisecond;
    proto.utcOffset = getSetOffset;
    proto.utc = setOffsetToUTC;
    proto.local = setOffsetToLocal;
    proto.parseZone = setOffsetToParsedOffset;
    proto.hasAlignedHourOffset = hasAlignedHourOffset;
    proto.isDST = isDaylightSavingTime;
    proto.isLocal = isLocal;
    proto.isUtcOffset = isUtcOffset;
    proto.isUtc = isUtc;
    proto.isUTC = isUtc;
    proto.zoneAbbr = getZoneAbbr;
    proto.zoneName = getZoneName;
    proto.dates = deprecate('dates accessor is deprecated. Use date instead.', getSetDayOfMonth);
    proto.months = deprecate('months accessor is deprecated. Use month instead', getSetMonth);
    proto.years = deprecate('years accessor is deprecated. Use year instead', getSetYear);
    proto.zone = deprecate('moment().zone is deprecated, use moment().utcOffset instead. http://momentjs.com/guides/#/warnings/zone/', getSetZone);
    proto.isDSTShifted = deprecate('isDSTShifted is deprecated. See http://momentjs.com/guides/#/warnings/dst-shifted/ for more information', isDaylightSavingTimeShifted);

    function createUnix(input) {
      return createLocal(input * 1000);
    }

    function createInZone() {
      return createLocal.apply(null, arguments).parseZone();
    }

    function preParsePostFormat(string) {
      return string;
    }

    var proto$1 = Locale.prototype;
    proto$1.calendar = calendar;
    proto$1.longDateFormat = longDateFormat;
    proto$1.invalidDate = invalidDate;
    proto$1.ordinal = ordinal;
    proto$1.preparse = preParsePostFormat;
    proto$1.postformat = preParsePostFormat;
    proto$1.relativeTime = relativeTime;
    proto$1.pastFuture = pastFuture;
    proto$1.set = set;
    proto$1.months = localeMonths;
    proto$1.monthsShort = localeMonthsShort;
    proto$1.monthsParse = localeMonthsParse;
    proto$1.monthsRegex = monthsRegex;
    proto$1.monthsShortRegex = monthsShortRegex;
    proto$1.week = localeWeek;
    proto$1.firstDayOfYear = localeFirstDayOfYear;
    proto$1.firstDayOfWeek = localeFirstDayOfWeek;
    proto$1.weekdays = localeWeekdays;
    proto$1.weekdaysMin = localeWeekdaysMin;
    proto$1.weekdaysShort = localeWeekdaysShort;
    proto$1.weekdaysParse = localeWeekdaysParse;
    proto$1.weekdaysRegex = weekdaysRegex;
    proto$1.weekdaysShortRegex = weekdaysShortRegex;
    proto$1.weekdaysMinRegex = weekdaysMinRegex;
    proto$1.isPM = localeIsPM;
    proto$1.meridiem = localeMeridiem;

    function get$1(format, index, field, setter) {
      var locale = getLocale();
      var utc = createUTC().set(setter, index);
      return locale[field](utc, format);
    }

    function listMonthsImpl(format, index, field) {
      if (isNumber(format)) {
        index = format;
        format = undefined;
      }

      format = format || '';

      if (index != null) {
        return get$1(format, index, field, 'month');
      }

      var i;
      var out = [];

      for (i = 0; i < 12; i++) {
        out[i] = get$1(format, i, field, 'month');
      }

      return out;
    } // ()
    // (5)
    // (fmt, 5)
    // (fmt)
    // (true)
    // (true, 5)
    // (true, fmt, 5)
    // (true, fmt)


    function listWeekdaysImpl(localeSorted, format, index, field) {
      if (typeof localeSorted === 'boolean') {
        if (isNumber(format)) {
          index = format;
          format = undefined;
        }

        format = format || '';
      } else {
        format = localeSorted;
        index = format;
        localeSorted = false;

        if (isNumber(format)) {
          index = format;
          format = undefined;
        }

        format = format || '';
      }

      var locale = getLocale(),
          shift = localeSorted ? locale._week.dow : 0;

      if (index != null) {
        return get$1(format, (index + shift) % 7, field, 'day');
      }

      var i;
      var out = [];

      for (i = 0; i < 7; i++) {
        out[i] = get$1(format, (i + shift) % 7, field, 'day');
      }

      return out;
    }

    function listMonths(format, index) {
      return listMonthsImpl(format, index, 'months');
    }

    function listMonthsShort(format, index) {
      return listMonthsImpl(format, index, 'monthsShort');
    }

    function listWeekdays(localeSorted, format, index) {
      return listWeekdaysImpl(localeSorted, format, index, 'weekdays');
    }

    function listWeekdaysShort(localeSorted, format, index) {
      return listWeekdaysImpl(localeSorted, format, index, 'weekdaysShort');
    }

    function listWeekdaysMin(localeSorted, format, index) {
      return listWeekdaysImpl(localeSorted, format, index, 'weekdaysMin');
    }

    getSetGlobalLocale('en', {
      dayOfMonthOrdinalParse: /\d{1,2}(th|st|nd|rd)/,
      ordinal: function (number) {
        var b = number % 10,
            output = toInt(number % 100 / 10) === 1 ? 'th' : b === 1 ? 'st' : b === 2 ? 'nd' : b === 3 ? 'rd' : 'th';
        return number + output;
      }
    }); // Side effect imports

    hooks.lang = deprecate('moment.lang is deprecated. Use moment.locale instead.', getSetGlobalLocale);
    hooks.langData = deprecate('moment.langData is deprecated. Use moment.localeData instead.', getLocale);
    var mathAbs = Math.abs;

    function abs() {
      var data = this._data;
      this._milliseconds = mathAbs(this._milliseconds);
      this._days = mathAbs(this._days);
      this._months = mathAbs(this._months);
      data.milliseconds = mathAbs(data.milliseconds);
      data.seconds = mathAbs(data.seconds);
      data.minutes = mathAbs(data.minutes);
      data.hours = mathAbs(data.hours);
      data.months = mathAbs(data.months);
      data.years = mathAbs(data.years);
      return this;
    }

    function addSubtract$1(duration, input, value, direction) {
      var other = createDuration(input, value);
      duration._milliseconds += direction * other._milliseconds;
      duration._days += direction * other._days;
      duration._months += direction * other._months;
      return duration._bubble();
    } // supports only 2.0-style add(1, 's') or add(duration)


    function add$1(input, value) {
      return addSubtract$1(this, input, value, 1);
    } // supports only 2.0-style subtract(1, 's') or subtract(duration)


    function subtract$1(input, value) {
      return addSubtract$1(this, input, value, -1);
    }

    function absCeil(number) {
      if (number < 0) {
        return Math.floor(number);
      } else {
        return Math.ceil(number);
      }
    }

    function bubble() {
      var milliseconds = this._milliseconds;
      var days = this._days;
      var months = this._months;
      var data = this._data;
      var seconds, minutes, hours, years, monthsFromDays; // if we have a mix of positive and negative values, bubble down first
      // check: https://github.com/moment/moment/issues/2166

      if (!(milliseconds >= 0 && days >= 0 && months >= 0 || milliseconds <= 0 && days <= 0 && months <= 0)) {
        milliseconds += absCeil(monthsToDays(months) + days) * 864e5;
        days = 0;
        months = 0;
      } // The following code bubbles up values, see the tests for
      // examples of what that means.


      data.milliseconds = milliseconds % 1000;
      seconds = absFloor(milliseconds / 1000);
      data.seconds = seconds % 60;
      minutes = absFloor(seconds / 60);
      data.minutes = minutes % 60;
      hours = absFloor(minutes / 60);
      data.hours = hours % 24;
      days += absFloor(hours / 24); // convert days to months

      monthsFromDays = absFloor(daysToMonths(days));
      months += monthsFromDays;
      days -= absCeil(monthsToDays(monthsFromDays)); // 12 months -> 1 year

      years = absFloor(months / 12);
      months %= 12;
      data.days = days;
      data.months = months;
      data.years = years;
      return this;
    }

    function daysToMonths(days) {
      // 400 years have 146097 days (taking into account leap year rules)
      // 400 years have 12 months === 4800
      return days * 4800 / 146097;
    }

    function monthsToDays(months) {
      // the reverse of daysToMonths
      return months * 146097 / 4800;
    }

    function as(units) {
      if (!this.isValid()) {
        return NaN;
      }

      var days;
      var months;
      var milliseconds = this._milliseconds;
      units = normalizeUnits(units);

      if (units === 'month' || units === 'quarter' || units === 'year') {
        days = this._days + milliseconds / 864e5;
        months = this._months + daysToMonths(days);

        switch (units) {
          case 'month':
            return months;

          case 'quarter':
            return months / 3;

          case 'year':
            return months / 12;
        }
      } else {
        // handle milliseconds separately because of floating point math errors (issue #1867)
        days = this._days + Math.round(monthsToDays(this._months));

        switch (units) {
          case 'week':
            return days / 7 + milliseconds / 6048e5;

          case 'day':
            return days + milliseconds / 864e5;

          case 'hour':
            return days * 24 + milliseconds / 36e5;

          case 'minute':
            return days * 1440 + milliseconds / 6e4;

          case 'second':
            return days * 86400 + milliseconds / 1000;
          // Math.floor prevents floating point math errors here

          case 'millisecond':
            return Math.floor(days * 864e5) + milliseconds;

          default:
            throw new Error('Unknown unit ' + units);
        }
      }
    } // TODO: Use this.as('ms')?


    function valueOf$1() {
      if (!this.isValid()) {
        return NaN;
      }

      return this._milliseconds + this._days * 864e5 + this._months % 12 * 2592e6 + toInt(this._months / 12) * 31536e6;
    }

    function makeAs(alias) {
      return function () {
        return this.as(alias);
      };
    }

    var asMilliseconds = makeAs('ms');
    var asSeconds = makeAs('s');
    var asMinutes = makeAs('m');
    var asHours = makeAs('h');
    var asDays = makeAs('d');
    var asWeeks = makeAs('w');
    var asMonths = makeAs('M');
    var asQuarters = makeAs('Q');
    var asYears = makeAs('y');

    function clone$1() {
      return createDuration(this);
    }

    function get$2(units) {
      units = normalizeUnits(units);
      return this.isValid() ? this[units + 's']() : NaN;
    }

    function makeGetter(name) {
      return function () {
        return this.isValid() ? this._data[name] : NaN;
      };
    }

    var milliseconds = makeGetter('milliseconds');
    var seconds = makeGetter('seconds');
    var minutes = makeGetter('minutes');
    var hours = makeGetter('hours');
    var days = makeGetter('days');
    var months = makeGetter('months');
    var years = makeGetter('years');

    function weeks() {
      return absFloor(this.days() / 7);
    }

    var round = Math.round;
    var thresholds = {
      ss: 44,
      // a few seconds to seconds
      s: 45,
      // seconds to minute
      m: 45,
      // minutes to hour
      h: 22,
      // hours to day
      d: 26,
      // days to month
      M: 11 // months to year

    }; // helper function for moment.fn.from, moment.fn.fromNow, and moment.duration.fn.humanize

    function substituteTimeAgo(string, number, withoutSuffix, isFuture, locale) {
      return locale.relativeTime(number || 1, !!withoutSuffix, string, isFuture);
    }

    function relativeTime$1(posNegDuration, withoutSuffix, locale) {
      var duration = createDuration(posNegDuration).abs();
      var seconds = round(duration.as('s'));
      var minutes = round(duration.as('m'));
      var hours = round(duration.as('h'));
      var days = round(duration.as('d'));
      var months = round(duration.as('M'));
      var years = round(duration.as('y'));
      var a = seconds <= thresholds.ss && ['s', seconds] || seconds < thresholds.s && ['ss', seconds] || minutes <= 1 && ['m'] || minutes < thresholds.m && ['mm', minutes] || hours <= 1 && ['h'] || hours < thresholds.h && ['hh', hours] || days <= 1 && ['d'] || days < thresholds.d && ['dd', days] || months <= 1 && ['M'] || months < thresholds.M && ['MM', months] || years <= 1 && ['y'] || ['yy', years];
      a[2] = withoutSuffix;
      a[3] = +posNegDuration > 0;
      a[4] = locale;
      return substituteTimeAgo.apply(null, a);
    } // This function allows you to set the rounding function for relative time strings


    function getSetRelativeTimeRounding(roundingFunction) {
      if (roundingFunction === undefined) {
        return round;
      }

      if (typeof roundingFunction === 'function') {
        round = roundingFunction;
        return true;
      }

      return false;
    } // This function allows you to set a threshold for relative time strings


    function getSetRelativeTimeThreshold(threshold, limit) {
      if (thresholds[threshold] === undefined) {
        return false;
      }

      if (limit === undefined) {
        return thresholds[threshold];
      }

      thresholds[threshold] = limit;

      if (threshold === 's') {
        thresholds.ss = limit - 1;
      }

      return true;
    }

    function humanize(withSuffix) {
      if (!this.isValid()) {
        return this.localeData().invalidDate();
      }

      var locale = this.localeData();
      var output = relativeTime$1(this, !withSuffix, locale);

      if (withSuffix) {
        output = locale.pastFuture(+this, output);
      }

      return locale.postformat(output);
    }

    var abs$1 = Math.abs;

    function sign(x) {
      return (x > 0) - (x < 0) || +x;
    }

    function toISOString$1() {
      // for ISO strings we do not use the normal bubbling rules:
      //  * milliseconds bubble up until they become hours
      //  * days do not bubble at all
      //  * months bubble up until they become years
      // This is because there is no context-free conversion between hours and days
      // (think of clock changes)
      // and also not between days and months (28-31 days per month)
      if (!this.isValid()) {
        return this.localeData().invalidDate();
      }

      var seconds = abs$1(this._milliseconds) / 1000;
      var days = abs$1(this._days);
      var months = abs$1(this._months);
      var minutes, hours, years; // 3600 seconds -> 60 minutes -> 1 hour

      minutes = absFloor(seconds / 60);
      hours = absFloor(minutes / 60);
      seconds %= 60;
      minutes %= 60; // 12 months -> 1 year

      years = absFloor(months / 12);
      months %= 12; // inspired by https://github.com/dordille/moment-isoduration/blob/master/moment.isoduration.js

      var Y = years;
      var M = months;
      var D = days;
      var h = hours;
      var m = minutes;
      var s = seconds ? seconds.toFixed(3).replace(/\.?0+$/, '') : '';
      var total = this.asSeconds();

      if (!total) {
        // this is the same as C#'s (Noda) and python (isodate)...
        // but not other JS (goog.date)
        return 'P0D';
      }

      var totalSign = total < 0 ? '-' : '';
      var ymSign = sign(this._months) !== sign(total) ? '-' : '';
      var daysSign = sign(this._days) !== sign(total) ? '-' : '';
      var hmsSign = sign(this._milliseconds) !== sign(total) ? '-' : '';
      return totalSign + 'P' + (Y ? ymSign + Y + 'Y' : '') + (M ? ymSign + M + 'M' : '') + (D ? daysSign + D + 'D' : '') + (h || m || s ? 'T' : '') + (h ? hmsSign + h + 'H' : '') + (m ? hmsSign + m + 'M' : '') + (s ? hmsSign + s + 'S' : '');
    }

    var proto$2 = Duration.prototype;
    proto$2.isValid = isValid$1;
    proto$2.abs = abs;
    proto$2.add = add$1;
    proto$2.subtract = subtract$1;
    proto$2.as = as;
    proto$2.asMilliseconds = asMilliseconds;
    proto$2.asSeconds = asSeconds;
    proto$2.asMinutes = asMinutes;
    proto$2.asHours = asHours;
    proto$2.asDays = asDays;
    proto$2.asWeeks = asWeeks;
    proto$2.asMonths = asMonths;
    proto$2.asQuarters = asQuarters;
    proto$2.asYears = asYears;
    proto$2.valueOf = valueOf$1;
    proto$2._bubble = bubble;
    proto$2.clone = clone$1;
    proto$2.get = get$2;
    proto$2.milliseconds = milliseconds;
    proto$2.seconds = seconds;
    proto$2.minutes = minutes;
    proto$2.hours = hours;
    proto$2.days = days;
    proto$2.weeks = weeks;
    proto$2.months = months;
    proto$2.years = years;
    proto$2.humanize = humanize;
    proto$2.toISOString = toISOString$1;
    proto$2.toString = toISOString$1;
    proto$2.toJSON = toISOString$1;
    proto$2.locale = locale;
    proto$2.localeData = localeData;
    proto$2.toIsoString = deprecate('toIsoString() is deprecated. Please use toISOString() instead (notice the capitals)', toISOString$1);
    proto$2.lang = lang; // Side effect imports
    // FORMATTING

    addFormatToken('X', 0, 0, 'unix');
    addFormatToken('x', 0, 0, 'valueOf'); // PARSING

    addRegexToken('x', matchSigned);
    addRegexToken('X', matchTimestamp);
    addParseToken('X', function (input, array, config) {
      config._d = new Date(parseFloat(input, 10) * 1000);
    });
    addParseToken('x', function (input, array, config) {
      config._d = new Date(toInt(input));
    }); // Side effect imports

    hooks.version = '2.24.0';
    setHookCallback(createLocal);
    hooks.fn = proto;
    hooks.min = min;
    hooks.max = max;
    hooks.now = now;
    hooks.utc = createUTC;
    hooks.unix = createUnix;
    hooks.months = listMonths;
    hooks.isDate = isDate;
    hooks.locale = getSetGlobalLocale;
    hooks.invalid = createInvalid;
    hooks.duration = createDuration;
    hooks.isMoment = isMoment;
    hooks.weekdays = listWeekdays;
    hooks.parseZone = createInZone;
    hooks.localeData = getLocale;
    hooks.isDuration = isDuration;
    hooks.monthsShort = listMonthsShort;
    hooks.weekdaysMin = listWeekdaysMin;
    hooks.defineLocale = defineLocale;
    hooks.updateLocale = updateLocale;
    hooks.locales = listLocales;
    hooks.weekdaysShort = listWeekdaysShort;
    hooks.normalizeUnits = normalizeUnits;
    hooks.relativeTimeRounding = getSetRelativeTimeRounding;
    hooks.relativeTimeThreshold = getSetRelativeTimeThreshold;
    hooks.calendarFormat = getCalendarFormat;
    hooks.prototype = proto; // currently HTML5 input type only supports 24-hour formats

    hooks.HTML5_FMT = {
      DATETIME_LOCAL: 'YYYY-MM-DDTHH:mm',
      // <input type="datetime-local" />
      DATETIME_LOCAL_SECONDS: 'YYYY-MM-DDTHH:mm:ss',
      // <input type="datetime-local" step="1" />
      DATETIME_LOCAL_MS: 'YYYY-MM-DDTHH:mm:ss.SSS',
      // <input type="datetime-local" step="0.001" />
      DATE: 'YYYY-MM-DD',
      // <input type="date" />
      TIME: 'HH:mm',
      // <input type="time" />
      TIME_SECONDS: 'HH:mm:ss',
      // <input type="time" step="1" />
      TIME_MS: 'HH:mm:ss.SSS',
      // <input type="time" step="0.001" />
      WEEK: 'GGGG-[W]WW',
      // <input type="week" />
      MONTH: 'YYYY-MM' // <input type="month" />

    };
    return hooks;
  });
});

// use this instance. Else, load via commonjs.

var moment$3 = typeof window !== 'undefined' && window['moment'] || moment$2;

function _typeof$1(obj) {
  if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
    _typeof$1 = function (obj) {
      return typeof obj;
    };
  } else {
    _typeof$1 = function (obj) {
      return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
    };
  }

  return _typeof$1(obj);
}

function _classCallCheck$1(instance, Constructor) {
  if (!(instance instanceof Constructor)) {
    throw new TypeError("Cannot call a class as a function");
  }
}

function _defineProperties$1(target, props) {
  for (var i = 0; i < props.length; i++) {
    var descriptor = props[i];
    descriptor.enumerable = descriptor.enumerable || false;
    descriptor.configurable = true;
    if ("value" in descriptor) descriptor.writable = true;
    Object.defineProperty(target, descriptor.key, descriptor);
  }
}

function _createClass$1(Constructor, protoProps, staticProps) {
  if (protoProps) _defineProperties$1(Constructor.prototype, protoProps);
  if (staticProps) _defineProperties$1(Constructor, staticProps);
  return Constructor;
}

/**
 * Prototype for visual components
 * @param {{dom: Object, domProps: Object, emitter: Emitter, range: Range}} [body]
 * @param {Object} [options]
 */

function Component(body, options) {
  // eslint-disable-line no-unused-vars
  this.options = null;
  this.props = null;
}
/**
 * Set options for the component. The new options will be merged into the
 * current options.
 * @param {Object} options
 */


Component.prototype.setOptions = function (options) {
  if (options) {
    util.extend(this.options, options);
  }
};
/**
 * Repaint the component
 * @return {boolean} Returns true if the component is resized
 */


Component.prototype.redraw = function () {
  // should be implemented by the component
  return false;
};
/**
 * Destroy the component. Cleanup DOM and event listeners
 */


Component.prototype.destroy = function () {// should be implemented by the component
};
/**
 * Test whether the component is resized since the last time _isResized() was
 * called.
 * @return {Boolean} Returns true if the component is resized
 * @protected
 */


Component.prototype._isResized = function () {
  var resized = this.props._previousWidth !== this.props.width || this.props._previousHeight !== this.props.height;
  this.props._previousWidth = this.props.width;
  this.props._previousHeight = this.props.height;
  return resized;
};

var Component_1 = Component;

var DateUtil = createCommonjsModule$1(function (module, exports) {
  /**
   * used in Core to convert the options into a volatile variable
   * 
   * @param {function} moment
   * @param {Object} body
   * @param {Array | Object} hiddenDates
   * @returns {number}
   */
  exports.convertHiddenOptions = function (moment, body, hiddenDates) {
    if (hiddenDates && !Array.isArray(hiddenDates)) {
      return exports.convertHiddenOptions(moment, body, [hiddenDates]);
    }

    body.hiddenDates = [];

    if (hiddenDates) {
      if (Array.isArray(hiddenDates) == true) {
        for (var i = 0; i < hiddenDates.length; i++) {
          if (hiddenDates[i].repeat === undefined) {
            var dateItem = {};
            dateItem.start = moment(hiddenDates[i].start).toDate().valueOf();
            dateItem.end = moment(hiddenDates[i].end).toDate().valueOf();
            body.hiddenDates.push(dateItem);
          }
        }

        body.hiddenDates.sort(function (a, b) {
          return a.start - b.start;
        }); // sort by start time
      }
    }
  };
  /**
   * create new entrees for the repeating hidden dates
   *
   * @param {function} moment
   * @param {Object} body
   * @param {Array | Object} hiddenDates
   * @returns {null}
   */


  exports.updateHiddenDates = function (moment, body, hiddenDates) {
    if (hiddenDates && !Array.isArray(hiddenDates)) {
      return exports.updateHiddenDates(moment, body, [hiddenDates]);
    }

    if (hiddenDates && body.domProps.centerContainer.width !== undefined) {
      exports.convertHiddenOptions(moment, body, hiddenDates);
      var start = moment(body.range.start);
      var end = moment(body.range.end);
      var totalRange = body.range.end - body.range.start;
      var pixelTime = totalRange / body.domProps.centerContainer.width;

      for (var i = 0; i < hiddenDates.length; i++) {
        if (hiddenDates[i].repeat !== undefined) {
          var startDate = moment(hiddenDates[i].start);
          var endDate = moment(hiddenDates[i].end);

          if (startDate._d == "Invalid Date") {
            throw new Error("Supplied start date is not valid: " + hiddenDates[i].start);
          }

          if (endDate._d == "Invalid Date") {
            throw new Error("Supplied end date is not valid: " + hiddenDates[i].end);
          }

          var duration = endDate - startDate;

          if (duration >= 4 * pixelTime) {
            var offset = 0;
            var runUntil = end.clone();

            switch (hiddenDates[i].repeat) {
              case "daily":
                // case of time
                if (startDate.day() != endDate.day()) {
                  offset = 1;
                }

                startDate.dayOfYear(start.dayOfYear());
                startDate.year(start.year());
                startDate.subtract(7, 'days');
                endDate.dayOfYear(start.dayOfYear());
                endDate.year(start.year());
                endDate.subtract(7 - offset, 'days');
                runUntil.add(1, 'weeks');
                break;

              case "weekly":
                var dayOffset = endDate.diff(startDate, 'days');
                var day = startDate.day(); // set the start date to the range.start

                startDate.date(start.date());
                startDate.month(start.month());
                startDate.year(start.year());
                endDate = startDate.clone(); // force

                startDate.day(day);
                endDate.day(day);
                endDate.add(dayOffset, 'days');
                startDate.subtract(1, 'weeks');
                endDate.subtract(1, 'weeks');
                runUntil.add(1, 'weeks');
                break;

              case "monthly":
                if (startDate.month() != endDate.month()) {
                  offset = 1;
                }

                startDate.month(start.month());
                startDate.year(start.year());
                startDate.subtract(1, 'months');
                endDate.month(start.month());
                endDate.year(start.year());
                endDate.subtract(1, 'months');
                endDate.add(offset, 'months');
                runUntil.add(1, 'months');
                break;

              case "yearly":
                if (startDate.year() != endDate.year()) {
                  offset = 1;
                }

                startDate.year(start.year());
                startDate.subtract(1, 'years');
                endDate.year(start.year());
                endDate.subtract(1, 'years');
                endDate.add(offset, 'years');
                runUntil.add(1, 'years');
                break;

              default:
                console.log("Wrong repeat format, allowed are: daily, weekly, monthly, yearly. Given:", hiddenDates[i].repeat);
                return;
            }

            while (startDate < runUntil) {
              body.hiddenDates.push({
                start: startDate.valueOf(),
                end: endDate.valueOf()
              });

              switch (hiddenDates[i].repeat) {
                case "daily":
                  startDate.add(1, 'days');
                  endDate.add(1, 'days');
                  break;

                case "weekly":
                  startDate.add(1, 'weeks');
                  endDate.add(1, 'weeks');
                  break;

                case "monthly":
                  startDate.add(1, 'months');
                  endDate.add(1, 'months');
                  break;

                case "yearly":
                  startDate.add(1, 'y');
                  endDate.add(1, 'y');
                  break;

                default:
                  console.log("Wrong repeat format, allowed are: daily, weekly, monthly, yearly. Given:", hiddenDates[i].repeat);
                  return;
              }
            }

            body.hiddenDates.push({
              start: startDate.valueOf(),
              end: endDate.valueOf()
            });
          }
        }
      } // remove duplicates, merge where possible


      exports.removeDuplicates(body); // ensure the new positions are not on hidden dates

      var startHidden = exports.isHidden(body.range.start, body.hiddenDates);
      var endHidden = exports.isHidden(body.range.end, body.hiddenDates);
      var rangeStart = body.range.start;
      var rangeEnd = body.range.end;

      if (startHidden.hidden == true) {
        rangeStart = body.range.startToFront == true ? startHidden.startDate - 1 : startHidden.endDate + 1;
      }

      if (endHidden.hidden == true) {
        rangeEnd = body.range.endToFront == true ? endHidden.startDate - 1 : endHidden.endDate + 1;
      }

      if (startHidden.hidden == true || endHidden.hidden == true) {
        body.range._applyRange(rangeStart, rangeEnd);
      }
    }
  };
  /**
   * remove duplicates from the hidden dates list. Duplicates are evil. They mess everything up.
   * Scales with N^2
   *
   * @param {Object} body
   */


  exports.removeDuplicates = function (body) {
    var hiddenDates = body.hiddenDates;
    var safeDates = [];

    for (var i = 0; i < hiddenDates.length; i++) {
      for (var j = 0; j < hiddenDates.length; j++) {
        if (i != j && hiddenDates[j].remove != true && hiddenDates[i].remove != true) {
          // j inside i
          if (hiddenDates[j].start >= hiddenDates[i].start && hiddenDates[j].end <= hiddenDates[i].end) {
            hiddenDates[j].remove = true;
          } // j start inside i
          else if (hiddenDates[j].start >= hiddenDates[i].start && hiddenDates[j].start <= hiddenDates[i].end) {
              hiddenDates[i].end = hiddenDates[j].end;
              hiddenDates[j].remove = true;
            } // j end inside i
            else if (hiddenDates[j].end >= hiddenDates[i].start && hiddenDates[j].end <= hiddenDates[i].end) {
                hiddenDates[i].start = hiddenDates[j].start;
                hiddenDates[j].remove = true;
              }
        }
      }
    }

    for (i = 0; i < hiddenDates.length; i++) {
      if (hiddenDates[i].remove !== true) {
        safeDates.push(hiddenDates[i]);
      }
    }

    body.hiddenDates = safeDates;
    body.hiddenDates.sort(function (a, b) {
      return a.start - b.start;
    }); // sort by start time
  };

  exports.printDates = function (dates) {
    for (var i = 0; i < dates.length; i++) {
      console.log(i, new Date(dates[i].start), new Date(dates[i].end), dates[i].start, dates[i].end, dates[i].remove);
    }
  };
  /**
   * Used in TimeStep to avoid the hidden times.
   * @param {function} moment
   * @param {TimeStep} timeStep
   * @param {Date} previousTime
   */


  exports.stepOverHiddenDates = function (moment, timeStep, previousTime) {
    var stepInHidden = false;
    var currentValue = timeStep.current.valueOf();

    for (var i = 0; i < timeStep.hiddenDates.length; i++) {
      var startDate = timeStep.hiddenDates[i].start;
      var endDate = timeStep.hiddenDates[i].end;

      if (currentValue >= startDate && currentValue < endDate) {
        stepInHidden = true;
        break;
      }
    }

    if (stepInHidden == true && currentValue < timeStep._end.valueOf() && currentValue != previousTime) {
      var prevValue = moment(previousTime);
      var newValue = moment(endDate); //check if the next step should be major

      if (prevValue.year() != newValue.year()) {
        timeStep.switchedYear = true;
      } else if (prevValue.month() != newValue.month()) {
        timeStep.switchedMonth = true;
      } else if (prevValue.dayOfYear() != newValue.dayOfYear()) {
        timeStep.switchedDay = true;
      }

      timeStep.current = newValue;
    }
  }; ///**
  // * Used in TimeStep to avoid the hidden times.
  // * @param timeStep
  // * @param previousTime
  // */
  //exports.checkFirstStep = function(timeStep) {
  //  var stepInHidden = false;
  //  var currentValue = timeStep.current.valueOf();
  //  for (var i = 0; i < timeStep.hiddenDates.length; i++) {
  //    var startDate = timeStep.hiddenDates[i].start;
  //    var endDate = timeStep.hiddenDates[i].end;
  //    if (currentValue >= startDate && currentValue < endDate) {
  //      stepInHidden = true;
  //      break;
  //    }
  //  }
  //
  //  if (stepInHidden == true && currentValue <= timeStep._end.valueOf()) {
  //    var newValue = moment(endDate);
  //    timeStep.current = newValue.toDate();
  //  }
  //};

  /**
   * replaces the Core toScreen methods
   *
   * @param {vis.Core} Core
   * @param {Date} time
   * @param {number} width
   * @returns {number}
   */


  exports.toScreen = function (Core, time, width) {
    var conversion;

    if (Core.body.hiddenDates.length == 0) {
      conversion = Core.range.conversion(width);
      return (time.valueOf() - conversion.offset) * conversion.scale;
    } else {
      var hidden = exports.isHidden(time, Core.body.hiddenDates);

      if (hidden.hidden == true) {
        time = hidden.startDate;
      }

      var duration = exports.getHiddenDurationBetween(Core.body.hiddenDates, Core.range.start, Core.range.end);

      if (time < Core.range.start) {
        conversion = Core.range.conversion(width, duration);
        var hiddenBeforeStart = exports.getHiddenDurationBeforeStart(Core.body.hiddenDates, time, conversion.offset);
        time = Core.options.moment(time).toDate().valueOf();
        time = time + hiddenBeforeStart;
        return -(conversion.offset - time.valueOf()) * conversion.scale;
      } else if (time > Core.range.end) {
        var rangeAfterEnd = {
          start: Core.range.start,
          end: time
        };
        time = exports.correctTimeForHidden(Core.options.moment, Core.body.hiddenDates, rangeAfterEnd, time);
        conversion = Core.range.conversion(width, duration);
        return (time.valueOf() - conversion.offset) * conversion.scale;
      } else {
        time = exports.correctTimeForHidden(Core.options.moment, Core.body.hiddenDates, Core.range, time);
        conversion = Core.range.conversion(width, duration);
        return (time.valueOf() - conversion.offset) * conversion.scale;
      }
    }
  };
  /**
   * Replaces the core toTime methods
   *
   * @param {vis.Core} Core
   * @param {number} x
   * @param {number} width
   * @returns {Date}
   */


  exports.toTime = function (Core, x, width) {
    if (Core.body.hiddenDates.length == 0) {
      var conversion = Core.range.conversion(width);
      return new Date(x / conversion.scale + conversion.offset);
    } else {
      var hiddenDuration = exports.getHiddenDurationBetween(Core.body.hiddenDates, Core.range.start, Core.range.end);
      var totalDuration = Core.range.end - Core.range.start - hiddenDuration;
      var partialDuration = totalDuration * x / width;
      var accumulatedHiddenDuration = exports.getAccumulatedHiddenDuration(Core.body.hiddenDates, Core.range, partialDuration);
      return new Date(accumulatedHiddenDuration + partialDuration + Core.range.start);
    }
  };
  /**
   * Support function
   *
   * @param {Array.<{start: Window.start, end: *}>} hiddenDates
   * @param {number} start
   * @param {number} end
   * @returns {number}
   */


  exports.getHiddenDurationBetween = function (hiddenDates, start, end) {
    var duration = 0;

    for (var i = 0; i < hiddenDates.length; i++) {
      var startDate = hiddenDates[i].start;
      var endDate = hiddenDates[i].end; // if time after the cutout, and the

      if (startDate >= start && endDate < end) {
        duration += endDate - startDate;
      }
    }

    return duration;
  };
  /**
   * Support function
   *
   * @param {Array.<{start: Window.start, end: *}>} hiddenDates
   * @param {number} start
   * @param {number} end
   * @returns {number}
   */


  exports.getHiddenDurationBeforeStart = function (hiddenDates, start, end) {
    var duration = 0;

    for (var i = 0; i < hiddenDates.length; i++) {
      var startDate = hiddenDates[i].start;
      var endDate = hiddenDates[i].end;

      if (startDate >= start && endDate <= end) {
        duration += endDate - startDate;
      }
    }

    return duration;
  };
  /**
   * Support function
   * @param {function} moment
   * @param {Array.<{start: Window.start, end: *}>} hiddenDates
   * @param {{start: number, end: number}} range
   * @param {Date} time
   * @returns {number}
   */


  exports.correctTimeForHidden = function (moment, hiddenDates, range, time) {
    time = moment(time).toDate().valueOf();
    time -= exports.getHiddenDurationBefore(moment, hiddenDates, range, time);
    return time;
  };

  exports.getHiddenDurationBefore = function (moment, hiddenDates, range, time) {
    var timeOffset = 0;
    time = moment(time).toDate().valueOf();

    for (var i = 0; i < hiddenDates.length; i++) {
      var startDate = hiddenDates[i].start;
      var endDate = hiddenDates[i].end; // if time after the cutout, and the

      if (startDate >= range.start && endDate < range.end) {
        if (time >= endDate) {
          timeOffset += endDate - startDate;
        }
      }
    }

    return timeOffset;
  };
  /**
   * sum the duration from start to finish, including the hidden duration,
   * until the required amount has been reached, return the accumulated hidden duration
   * @param {Array.<{start: Window.start, end: *}>} hiddenDates
   * @param {{start: number, end: number}} range
   * @param {number} [requiredDuration=0]
   * @returns {number}
   */


  exports.getAccumulatedHiddenDuration = function (hiddenDates, range, requiredDuration) {
    var hiddenDuration = 0;
    var duration = 0;
    var previousPoint = range.start; //exports.printDates(hiddenDates)

    for (var i = 0; i < hiddenDates.length; i++) {
      var startDate = hiddenDates[i].start;
      var endDate = hiddenDates[i].end; // if time after the cutout, and the

      if (startDate >= range.start && endDate < range.end) {
        duration += startDate - previousPoint;
        previousPoint = endDate;

        if (duration >= requiredDuration) {
          break;
        } else {
          hiddenDuration += endDate - startDate;
        }
      }
    }

    return hiddenDuration;
  };
  /**
   * used to step over to either side of a hidden block. Correction is disabled on tablets, might be set to true
   * @param {Array.<{start: Window.start, end: *}>} hiddenDates
   * @param {Date} time
   * @param {number} direction
   * @param {boolean} correctionEnabled
   * @returns {Date|number}
   */


  exports.snapAwayFromHidden = function (hiddenDates, time, direction, correctionEnabled) {
    var isHidden = exports.isHidden(time, hiddenDates);

    if (isHidden.hidden == true) {
      if (direction < 0) {
        if (correctionEnabled == true) {
          return isHidden.startDate - (isHidden.endDate - time) - 1;
        } else {
          return isHidden.startDate - 1;
        }
      } else {
        if (correctionEnabled == true) {
          return isHidden.endDate + (time - isHidden.startDate) + 1;
        } else {
          return isHidden.endDate + 1;
        }
      }
    } else {
      return time;
    }
  };
  /**
   * Check if a time is hidden
   *
   * @param {Date} time
   * @param {Array.<{start: Window.start, end: *}>} hiddenDates
   * @returns {{hidden: boolean, startDate: Window.start, endDate: *}}
   */


  exports.isHidden = function (time, hiddenDates) {
    for (var i = 0; i < hiddenDates.length; i++) {
      var startDate = hiddenDates[i].start;
      var endDate = hiddenDates[i].end;

      if (time >= startDate && time < endDate) {
        // if the start is entering a hidden zone
        return {
          hidden: true,
          startDate: startDate,
          endDate: endDate
        };
      }
    }

    return {
      hidden: false,
      startDate: startDate,
      endDate: endDate
    };
  };
});
var DateUtil_1 = DateUtil.convertHiddenOptions;
var DateUtil_2 = DateUtil.updateHiddenDates;
var DateUtil_3 = DateUtil.removeDuplicates;
var DateUtil_4 = DateUtil.printDates;
var DateUtil_5 = DateUtil.stepOverHiddenDates;
var DateUtil_6 = DateUtil.toScreen;
var DateUtil_7 = DateUtil.toTime;
var DateUtil_8 = DateUtil.getHiddenDurationBetween;
var DateUtil_9 = DateUtil.getHiddenDurationBeforeStart;
var DateUtil_10 = DateUtil.correctTimeForHidden;
var DateUtil_11 = DateUtil.getHiddenDurationBefore;
var DateUtil_12 = DateUtil.getAccumulatedHiddenDuration;
var DateUtil_13 = DateUtil.snapAwayFromHidden;
var DateUtil_14 = DateUtil.isHidden;

/**
 * A Range controls a numeric range with a start and end value.
 * The Range adjusts the range based on mouse events or programmatic changes,
 * and triggers events when the range is changing or has been changed.
 * @param {{dom: Object, domProps: Object, emitter: Emitter}} body
 * @param {Object} [options]    See description at Range.setOptions
 * @constructor Range
 * @extends Component
 */

function Range(body, options) {
  var now = moment$3().hours(0).minutes(0).seconds(0).milliseconds(0);
  var start = now.clone().add(-3, 'days').valueOf();
  var end = now.clone().add(3, 'days').valueOf();
  this.millisecondsPerPixelCache = undefined;

  if (options === undefined) {
    this.start = start;
    this.end = end;
  } else {
    this.start = options.start || start;
    this.end = options.end || end;
  }

  this.rolling = false;
  this.body = body;
  this.deltaDifference = 0;
  this.scaleOffset = 0;
  this.startToFront = false;
  this.endToFront = true; // default options

  this.defaultOptions = {
    rtl: false,
    start: null,
    end: null,
    moment: moment$3,
    direction: 'horizontal',
    // 'horizontal' or 'vertical'
    moveable: true,
    zoomable: true,
    min: null,
    max: null,
    zoomMin: 10,
    // milliseconds
    zoomMax: 1000 * 60 * 60 * 24 * 365 * 10000,
    // milliseconds
    rollingMode: {
      follow: false,
      offset: 0.5
    }
  };
  this.options = util.extend({}, this.defaultOptions);
  this.props = {
    touch: {}
  };
  this.animationTimer = null; // drag listeners for dragging

  this.body.emitter.on('panstart', this._onDragStart.bind(this));
  this.body.emitter.on('panmove', this._onDrag.bind(this));
  this.body.emitter.on('panend', this._onDragEnd.bind(this)); // mouse wheel for zooming

  this.body.emitter.on('mousewheel', this._onMouseWheel.bind(this)); // pinch to zoom

  this.body.emitter.on('touch', this._onTouch.bind(this));
  this.body.emitter.on('pinch', this._onPinch.bind(this)); // on click of rolling mode button

  this.body.dom.rollingModeBtn.addEventListener('click', this.startRolling.bind(this));
  this.setOptions(options);
}

Range.prototype = new Component_1();
/**
 * Set options for the range controller
 * @param {Object} options      Available options:
 *                              {number | Date | String} start  Start date for the range
 *                              {number | Date | String} end    End date for the range
 *                              {number} min    Minimum value for start
 *                              {number} max    Maximum value for end
 *                              {number} zoomMin    Set a minimum value for
 *                                                  (end - start).
 *                              {number} zoomMax    Set a maximum value for
 *                                                  (end - start).
 *                              {boolean} moveable Enable moving of the range
 *                                                 by dragging. True by default
 *                              {boolean} zoomable Enable zooming of the range
 *                                                 by pinching/scrolling. True by default
 */

Range.prototype.setOptions = function (options) {
  if (options) {
    // copy the options that we know
    var fields = ['animation', 'direction', 'min', 'max', 'zoomMin', 'zoomMax', 'moveable', 'zoomable', 'moment', 'activate', 'hiddenDates', 'zoomKey', 'rtl', 'showCurrentTime', 'rollingMode', 'horizontalScroll'];
    util.selectiveExtend(fields, this.options, options);

    if (options.rollingMode && options.rollingMode.follow) {
      this.startRolling();
    }

    if ('start' in options || 'end' in options) {
      // apply a new range. both start and end are optional
      this.setRange(options.start, options.end);
    }
  }
};
/**
 * Test whether direction has a valid value
 * @param {string} direction    'horizontal' or 'vertical'
 */


function validateDirection(direction) {
  if (direction != 'horizontal' && direction != 'vertical') {
    throw new TypeError('Unknown direction "' + direction + '". ' + 'Choose "horizontal" or "vertical".');
  }
}
/**
 * Start auto refreshing the current time bar
 */


Range.prototype.startRolling = function () {
  var me = this;
  /**
   *  Updates the current time.
   */

  function update() {
    me.stopRolling();
    me.rolling = true;
    var interval = me.end - me.start;
    var t = util.convert(new Date(), 'Date').valueOf();
    var start = t - interval * me.options.rollingMode.offset;
    var end = t + interval * (1 - me.options.rollingMode.offset);
    var options = {
      animation: false
    };
    me.setRange(start, end, options); // determine interval to refresh

    var scale = me.conversion(me.body.domProps.center.width).scale;
    interval = 1 / scale / 10;
    if (interval < 30) interval = 30;
    if (interval > 1000) interval = 1000;
    me.body.dom.rollingModeBtn.style.visibility = "hidden"; // start a renderTimer to adjust for the new time

    me.currentTimeTimer = setTimeout(update, interval);
  }

  update();
};
/**
 * Stop auto refreshing the current time bar
 */


Range.prototype.stopRolling = function () {
  if (this.currentTimeTimer !== undefined) {
    clearTimeout(this.currentTimeTimer);
    this.rolling = false;
    this.body.dom.rollingModeBtn.style.visibility = "visible";
  }
};
/**
 * Set a new start and end range
 * @param {Date | number | string} [start]
 * @param {Date | number | string} [end]
 * @param {Object} options      Available options:
 *                              {boolean | {duration: number, easingFunction: string}} [animation=false]
 *                                    If true, the range is animated
 *                                    smoothly to the new window. An object can be
 *                                    provided to specify duration and easing function.
 *                                    Default duration is 500 ms, and default easing
 *                                    function is 'easeInOutQuad'.
 *                              {boolean} [byUser=false]
 *                              {Event}  event  Mouse event
 * @param {Function} callback     a callback function to be executed at the end of this function  
 * @param {Function} frameCallback    a callback function executed each frame of the range animation.
 *                                    The callback will be passed three parameters:
 *                                    {number} easeCoefficient    an easing coefficent
 *                                    {boolean} willDraw          If true the caller will redraw after the callback completes
 *                                    {boolean} done              If true then animation is ending after the current frame
 */


Range.prototype.setRange = function (start, end, options, callback, frameCallback) {
  if (!options) {
    options = {};
  }

  if (options.byUser !== true) {
    options.byUser = false;
  }

  var me = this;
  var finalStart = start != undefined ? util.convert(start, 'Date').valueOf() : null;
  var finalEnd = end != undefined ? util.convert(end, 'Date').valueOf() : null;

  this._cancelAnimation();

  this.millisecondsPerPixelCache = undefined;

  if (options.animation) {
    // true or an Object
    var initStart = this.start;
    var initEnd = this.end;
    var duration = _typeof$1(options.animation) === 'object' && 'duration' in options.animation ? options.animation.duration : 500;
    var easingName = _typeof$1(options.animation) === 'object' && 'easingFunction' in options.animation ? options.animation.easingFunction : 'easeInOutQuad';
    var easingFunction = util.easingFunctions[easingName];

    if (!easingFunction) {
      throw new Error('Unknown easing function ' + JSON.stringify(easingName) + '. ' + 'Choose from: ' + Object.keys(util.easingFunctions).join(', '));
    }

    var initTime = new Date().valueOf();
    var anyChanged = false;

    var next = function next() {
      if (!me.props.touch.dragging) {
        var now = new Date().valueOf();
        var time = now - initTime;
        var ease = easingFunction(time / duration);
        var done = time > duration;
        var s = done || finalStart === null ? finalStart : initStart + (finalStart - initStart) * ease;
        var e = done || finalEnd === null ? finalEnd : initEnd + (finalEnd - initEnd) * ease;
        changed = me._applyRange(s, e);
        DateUtil.updateHiddenDates(me.options.moment, me.body, me.options.hiddenDates);
        anyChanged = anyChanged || changed;
        var params = {
          start: new Date(me.start),
          end: new Date(me.end),
          byUser: options.byUser,
          event: options.event
        };

        if (frameCallback) {
          frameCallback(ease, changed, done);
        }

        if (changed) {
          me.body.emitter.emit('rangechange', params);
        }

        if (done) {
          if (anyChanged) {
            me.body.emitter.emit('rangechanged', params);

            if (callback) {
              return callback();
            }
          }
        } else {
          // animate with as high as possible frame rate, leave 20 ms in between
          // each to prevent the browser from blocking
          me.animationTimer = setTimeout(next, 20);
        }
      }
    };

    return next();
  } else {
    var changed = this._applyRange(finalStart, finalEnd);

    DateUtil.updateHiddenDates(this.options.moment, this.body, this.options.hiddenDates);

    if (changed) {
      var params = {
        start: new Date(this.start),
        end: new Date(this.end),
        byUser: options.byUser,
        event: options.event
      };
      this.body.emitter.emit('rangechange', params);
      clearTimeout(me.timeoutID);
      me.timeoutID = setTimeout(function () {
        me.body.emitter.emit('rangechanged', params);
      }, 200);

      if (callback) {
        return callback();
      }
    }
  }
};
/**
 * Get the number of milliseconds per pixel.
 *
 * @returns {undefined|number}
 */


Range.prototype.getMillisecondsPerPixel = function () {
  if (this.millisecondsPerPixelCache === undefined) {
    this.millisecondsPerPixelCache = (this.end - this.start) / this.body.dom.center.clientWidth;
  }

  return this.millisecondsPerPixelCache;
};
/**
 * Stop an animation
 * @private
 */


Range.prototype._cancelAnimation = function () {
  if (this.animationTimer) {
    clearTimeout(this.animationTimer);
    this.animationTimer = null;
  }
};
/**
 * Set a new start and end range. This method is the same as setRange, but
 * does not trigger a range change and range changed event, and it returns
 * true when the range is changed
 * @param {number} [start]
 * @param {number} [end]
 * @return {boolean} changed
 * @private
 */


Range.prototype._applyRange = function (start, end) {
  var newStart = start != null ? util.convert(start, 'Date').valueOf() : this.start,
      newEnd = end != null ? util.convert(end, 'Date').valueOf() : this.end,
      max = this.options.max != null ? util.convert(this.options.max, 'Date').valueOf() : null,
      min = this.options.min != null ? util.convert(this.options.min, 'Date').valueOf() : null,
      diff; // check for valid number

  if (isNaN(newStart) || newStart === null) {
    throw new Error('Invalid start "' + start + '"');
  }

  if (isNaN(newEnd) || newEnd === null) {
    throw new Error('Invalid end "' + end + '"');
  } // prevent end < start


  if (newEnd < newStart) {
    newEnd = newStart;
  } // prevent start < min


  if (min !== null) {
    if (newStart < min) {
      diff = min - newStart;
      newStart += diff;
      newEnd += diff; // prevent end > max

      if (max != null) {
        if (newEnd > max) {
          newEnd = max;
        }
      }
    }
  } // prevent end > max


  if (max !== null) {
    if (newEnd > max) {
      diff = newEnd - max;
      newStart -= diff;
      newEnd -= diff; // prevent start < min

      if (min != null) {
        if (newStart < min) {
          newStart = min;
        }
      }
    }
  } // prevent (end-start) < zoomMin


  if (this.options.zoomMin !== null) {
    var zoomMin = parseFloat(this.options.zoomMin);

    if (zoomMin < 0) {
      zoomMin = 0;
    }

    if (newEnd - newStart < zoomMin) {
      // compensate for a scale of 0.5 ms
      var compensation = 0.5;

      if (this.end - this.start === zoomMin && newStart >= this.start - compensation && newEnd <= this.end) {
        // ignore this action, we are already zoomed to the minimum
        newStart = this.start;
        newEnd = this.end;
      } else {
        // zoom to the minimum
        diff = zoomMin - (newEnd - newStart);
        newStart -= diff / 2;
        newEnd += diff / 2;
      }
    }
  } // prevent (end-start) > zoomMax


  if (this.options.zoomMax !== null) {
    var zoomMax = parseFloat(this.options.zoomMax);

    if (zoomMax < 0) {
      zoomMax = 0;
    }

    if (newEnd - newStart > zoomMax) {
      if (this.end - this.start === zoomMax && newStart < this.start && newEnd > this.end) {
        // ignore this action, we are already zoomed to the maximum
        newStart = this.start;
        newEnd = this.end;
      } else {
        // zoom to the maximum
        diff = newEnd - newStart - zoomMax;
        newStart += diff / 2;
        newEnd -= diff / 2;
      }
    }
  }

  var changed = this.start != newStart || this.end != newEnd; // if the new range does NOT overlap with the old range, emit checkRangedItems to avoid not showing ranged items (ranged meaning has end time, not necessarily of type Range)

  if (!(newStart >= this.start && newStart <= this.end || newEnd >= this.start && newEnd <= this.end) && !(this.start >= newStart && this.start <= newEnd || this.end >= newStart && this.end <= newEnd)) {
    this.body.emitter.emit('checkRangedItems');
  }

  this.start = newStart;
  this.end = newEnd;
  return changed;
};
/**
 * Retrieve the current range.
 * @return {Object} An object with start and end properties
 */


Range.prototype.getRange = function () {
  return {
    start: this.start,
    end: this.end
  };
};
/**
 * Calculate the conversion offset and scale for current range, based on
 * the provided width
 * @param {number} width
 * @param {number} [totalHidden=0]
 * @returns {{offset: number, scale: number}} conversion
 */


Range.prototype.conversion = function (width, totalHidden) {
  return Range.conversion(this.start, this.end, width, totalHidden);
};
/**
 * Static method to calculate the conversion offset and scale for a range,
 * based on the provided start, end, and width
 * @param {number} start
 * @param {number} end
 * @param {number} width
 * @param {number} [totalHidden=0]
 * @returns {{offset: number, scale: number}} conversion
 */


Range.conversion = function (start, end, width, totalHidden) {
  if (totalHidden === undefined) {
    totalHidden = 0;
  }

  if (width != 0 && end - start != 0) {
    return {
      offset: start,
      scale: width / (end - start - totalHidden)
    };
  } else {
    return {
      offset: 0,
      scale: 1
    };
  }
};
/**
 * Start dragging horizontally or vertically
 * @param {Event} event
 * @private
 */


Range.prototype._onDragStart = function (event) {
  this.deltaDifference = 0;
  this.previousDelta = 0; // only allow dragging when configured as movable

  if (!this.options.moveable) return; // only start dragging when the mouse is inside the current range

  if (!this._isInsideRange(event)) return; // refuse to drag when we where pinching to prevent the timeline make a jump
  // when releasing the fingers in opposite order from the touch screen

  if (!this.props.touch.allowDragging) return;
  this.stopRolling();
  this.props.touch.start = this.start;
  this.props.touch.end = this.end;
  this.props.touch.dragging = true;

  if (this.body.dom.root) {
    this.body.dom.root.style.cursor = 'move';
  }
};
/**
 * Perform dragging operation
 * @param {Event} event
 * @private
 */


Range.prototype._onDrag = function (event) {
  if (!event) return;
  if (!this.props.touch.dragging) return; // only allow dragging when configured as movable

  if (!this.options.moveable) return; // TODO: this may be redundant in hammerjs2
  // refuse to drag when we where pinching to prevent the timeline make a jump
  // when releasing the fingers in opposite order from the touch screen

  if (!this.props.touch.allowDragging) return;
  var direction = this.options.direction;
  validateDirection(direction);
  var delta = direction == 'horizontal' ? event.deltaX : event.deltaY;
  delta -= this.deltaDifference;
  var interval = this.props.touch.end - this.props.touch.start; // normalize dragging speed if cutout is in between.

  var duration = DateUtil.getHiddenDurationBetween(this.body.hiddenDates, this.start, this.end);
  interval -= duration;
  var width = direction == 'horizontal' ? this.body.domProps.center.width : this.body.domProps.center.height;
  var diffRange;

  if (this.options.rtl) {
    diffRange = delta / width * interval;
  } else {
    diffRange = -delta / width * interval;
  }

  var newStart = this.props.touch.start + diffRange;
  var newEnd = this.props.touch.end + diffRange; // snapping times away from hidden zones

  var safeStart = DateUtil.snapAwayFromHidden(this.body.hiddenDates, newStart, this.previousDelta - delta, true);
  var safeEnd = DateUtil.snapAwayFromHidden(this.body.hiddenDates, newEnd, this.previousDelta - delta, true);

  if (safeStart != newStart || safeEnd != newEnd) {
    this.deltaDifference += delta;
    this.props.touch.start = safeStart;
    this.props.touch.end = safeEnd;

    this._onDrag(event);

    return;
  }

  this.previousDelta = delta;

  this._applyRange(newStart, newEnd);

  var startDate = new Date(this.start);
  var endDate = new Date(this.end); // fire a rangechange event

  this.body.emitter.emit('rangechange', {
    start: startDate,
    end: endDate,
    byUser: true,
    event: event
  }); // fire a panmove event

  this.body.emitter.emit('panmove');
};
/**
 * Stop dragging operation
 * @param {event} event
 * @private
 */


Range.prototype._onDragEnd = function (event) {
  if (!this.props.touch.dragging) return; // only allow dragging when configured as movable

  if (!this.options.moveable) return; // TODO: this may be redundant in hammerjs2
  // refuse to drag when we where pinching to prevent the timeline make a jump
  // when releasing the fingers in opposite order from the touch screen

  if (!this.props.touch.allowDragging) return;
  this.props.touch.dragging = false;

  if (this.body.dom.root) {
    this.body.dom.root.style.cursor = 'auto';
  } // fire a rangechanged event


  this.body.emitter.emit('rangechanged', {
    start: new Date(this.start),
    end: new Date(this.end),
    byUser: true,
    event: event
  });
};
/**
 * Event handler for mouse wheel event, used to zoom
 * Code from http://adomas.org/javascript-mouse-wheel/
 * @param {Event} event
 * @private
 */


Range.prototype._onMouseWheel = function (event) {
  // retrieve delta
  var delta = 0;

  if (event.wheelDelta) {
    /* IE/Opera. */
    delta = event.wheelDelta / 120;
  } else if (event.detail) {
    /* Mozilla case. */
    // In Mozilla, sign of delta is different than in IE.
    // Also, delta is multiple of 3.
    delta = -event.detail / 3;
  } else if (event.deltaY) {
    delta = -event.deltaY / 3;
  } // don't allow zoom when the according key is pressed and the zoomKey option or not zoomable but movable


  if (this.options.zoomKey && !event[this.options.zoomKey] && this.options.zoomable || !this.options.zoomable && this.options.moveable) {
    return;
  } // only allow zooming when configured as zoomable and moveable


  if (!(this.options.zoomable && this.options.moveable)) return; // only zoom when the mouse is inside the current range

  if (!this._isInsideRange(event)) return; // If delta is nonzero, handle it.
  // Basically, delta is now positive if wheel was scrolled up,
  // and negative, if wheel was scrolled down.

  if (delta) {
    // perform the zoom action. Delta is normally 1 or -1
    // adjust a negative delta such that zooming in with delta 0.1
    // equals zooming out with a delta -0.1
    var scale;

    if (delta < 0) {
      scale = 1 - delta / 5;
    } else {
      scale = 1 / (1 + delta / 5);
    } // calculate center, the date to zoom around


    var pointerDate;

    if (this.rolling) {
      pointerDate = this.start + (this.end - this.start) * this.options.rollingMode.offset;
    } else {
      var pointer = this.getPointer({
        x: event.clientX,
        y: event.clientY
      }, this.body.dom.center);
      pointerDate = this._pointerToDate(pointer);
    }

    this.zoom(scale, pointerDate, delta, event); // Prevent default actions caused by mouse wheel
    // (else the page and timeline both scroll)

    event.preventDefault();
  }
};
/**
 * Start of a touch gesture
 * @param {Event} event
 * @private
 */


Range.prototype._onTouch = function (event) {
  // eslint-disable-line no-unused-vars
  this.props.touch.start = this.start;
  this.props.touch.end = this.end;
  this.props.touch.allowDragging = true;
  this.props.touch.center = null;
  this.scaleOffset = 0;
  this.deltaDifference = 0; // Disable the browser default handling of this event.

  util.preventDefault(event);
};
/**
 * Handle pinch event
 * @param {Event} event
 * @private
 */


Range.prototype._onPinch = function (event) {
  // only allow zooming when configured as zoomable and moveable
  if (!(this.options.zoomable && this.options.moveable)) return; // Disable the browser default handling of this event.

  util.preventDefault(event);
  this.props.touch.allowDragging = false;

  if (!this.props.touch.center) {
    this.props.touch.center = this.getPointer(event.center, this.body.dom.center);
  }

  this.stopRolling();
  var scale = 1 / (event.scale + this.scaleOffset);

  var centerDate = this._pointerToDate(this.props.touch.center);

  var hiddenDuration = DateUtil.getHiddenDurationBetween(this.body.hiddenDates, this.start, this.end);
  var hiddenDurationBefore = DateUtil.getHiddenDurationBefore(this.options.moment, this.body.hiddenDates, this, centerDate);
  var hiddenDurationAfter = hiddenDuration - hiddenDurationBefore; // calculate new start and end

  var newStart = centerDate - hiddenDurationBefore + (this.props.touch.start - (centerDate - hiddenDurationBefore)) * scale;
  var newEnd = centerDate + hiddenDurationAfter + (this.props.touch.end - (centerDate + hiddenDurationAfter)) * scale; // snapping times away from hidden zones

  this.startToFront = 1 - scale <= 0; // used to do the right auto correction with periodic hidden times

  this.endToFront = scale - 1 <= 0; // used to do the right auto correction with periodic hidden times

  var safeStart = DateUtil.snapAwayFromHidden(this.body.hiddenDates, newStart, 1 - scale, true);
  var safeEnd = DateUtil.snapAwayFromHidden(this.body.hiddenDates, newEnd, scale - 1, true);

  if (safeStart != newStart || safeEnd != newEnd) {
    this.props.touch.start = safeStart;
    this.props.touch.end = safeEnd;
    this.scaleOffset = 1 - event.scale;
    newStart = safeStart;
    newEnd = safeEnd;
  }

  var options = {
    animation: false,
    byUser: true,
    event: event
  };
  this.setRange(newStart, newEnd, options);
  this.startToFront = false; // revert to default

  this.endToFront = true; // revert to default
};
/**
 * Test whether the mouse from a mouse event is inside the visible window,
 * between the current start and end date
 * @param {Object} event
 * @return {boolean} Returns true when inside the visible window
 * @private
 */


Range.prototype._isInsideRange = function (event) {
  // calculate the time where the mouse is, check whether inside
  // and no scroll action should happen.
  var clientX = event.center ? event.center.x : event.clientX;
  var x;

  if (this.options.rtl) {
    x = clientX - util.getAbsoluteLeft(this.body.dom.centerContainer);
  } else {
    x = util.getAbsoluteRight(this.body.dom.centerContainer) - clientX;
  }

  var time = this.body.util.toTime(x);
  return time >= this.start && time <= this.end;
};
/**
 * Helper function to calculate the center date for zooming
 * @param {{x: number, y: number}} pointer
 * @return {number} date
 * @private
 */


Range.prototype._pointerToDate = function (pointer) {
  var conversion;
  var direction = this.options.direction;
  validateDirection(direction);

  if (direction == 'horizontal') {
    return this.body.util.toTime(pointer.x).valueOf();
  } else {
    var height = this.body.domProps.center.height;
    conversion = this.conversion(height);
    return pointer.y / conversion.scale + conversion.offset;
  }
};
/**
 * Get the pointer location relative to the location of the dom element
 * @param {{x: number, y: number}} touch
 * @param {Element} element   HTML DOM element
 * @return {{x: number, y: number}} pointer
 * @private
 */


Range.prototype.getPointer = function (touch, element) {
  if (this.options.rtl) {
    return {
      x: util.getAbsoluteRight(element) - touch.x,
      y: touch.y - util.getAbsoluteTop(element)
    };
  } else {
    return {
      x: touch.x - util.getAbsoluteLeft(element),
      y: touch.y - util.getAbsoluteTop(element)
    };
  }
};
/**
 * Zoom the range the given scale in or out. Start and end date will
 * be adjusted, and the timeline will be redrawn. You can optionally give a
 * date around which to zoom.
 * For example, try scale = 0.9 or 1.1
 * @param {number} scale      Scaling factor. Values above 1 will zoom out,
 *                            values below 1 will zoom in.
 * @param {number} [center]   Value representing a date around which will
 *                            be zoomed.
 * @param {number} delta
 * @param {Event} event
 */


Range.prototype.zoom = function (scale, center, delta, event) {
  // if centerDate is not provided, take it half between start Date and end Date
  if (center == null) {
    center = (this.start + this.end) / 2;
  }

  var hiddenDuration = DateUtil.getHiddenDurationBetween(this.body.hiddenDates, this.start, this.end);
  var hiddenDurationBefore = DateUtil.getHiddenDurationBefore(this.options.moment, this.body.hiddenDates, this, center);
  var hiddenDurationAfter = hiddenDuration - hiddenDurationBefore; // calculate new start and end

  var newStart = center - hiddenDurationBefore + (this.start - (center - hiddenDurationBefore)) * scale;
  var newEnd = center + hiddenDurationAfter + (this.end - (center + hiddenDurationAfter)) * scale; // snapping times away from hidden zones

  this.startToFront = delta > 0 ? false : true; // used to do the right autocorrection with periodic hidden times

  this.endToFront = -delta > 0 ? false : true; // used to do the right autocorrection with periodic hidden times

  var safeStart = DateUtil.snapAwayFromHidden(this.body.hiddenDates, newStart, delta, true);
  var safeEnd = DateUtil.snapAwayFromHidden(this.body.hiddenDates, newEnd, -delta, true);

  if (safeStart != newStart || safeEnd != newEnd) {
    newStart = safeStart;
    newEnd = safeEnd;
  }

  var options = {
    animation: false,
    byUser: true,
    event: event
  };
  this.setRange(newStart, newEnd, options);
  this.startToFront = false; // revert to default

  this.endToFront = true; // revert to default
};
/**
 * Move the range with a given delta to the left or right. Start and end
 * value will be adjusted. For example, try delta = 0.1 or -0.1
 * @param {number}  delta     Moving amount. Positive value will move right,
 *                            negative value will move left
 */


Range.prototype.move = function (delta) {
  // zoom start Date and end Date relative to the centerDate
  var diff = this.end - this.start; // apply new values

  var newStart = this.start + diff * delta;
  var newEnd = this.end + diff * delta; // TODO: reckon with min and max range

  this.start = newStart;
  this.end = newEnd;
};
/**
 * Move the range to a new center point
 * @param {number} moveTo      New center point of the range
 */


Range.prototype.moveTo = function (moveTo) {
  var center = (this.start + this.end) / 2;
  var diff = center - moveTo; // calculate new start and end

  var newStart = this.start - diff;
  var newEnd = this.end - diff;
  var options = {
    animation: false,
    byUser: true,
    event: null
  };
  this.setRange(newStart, newEnd, options);
};

var Range_1 = Range;

/**
 * Expose `Emitter`.
 */
var emitterComponent = Emitter;
/**
 * Initialize a new `Emitter`.
 *
 * @api public
 */

function Emitter(obj) {
  if (obj) return mixin(obj);
}
/**
 * Mixin the emitter properties.
 *
 * @param {Object} obj
 * @return {Object}
 * @api private
 */

function mixin(obj) {
  for (var key in Emitter.prototype) {
    obj[key] = Emitter.prototype[key];
  }

  return obj;
}
/**
 * Listen on the given `event` with `fn`.
 *
 * @param {String} event
 * @param {Function} fn
 * @return {Emitter}
 * @api public
 */


Emitter.prototype.on = Emitter.prototype.addEventListener = function (event, fn) {
  this._callbacks = this._callbacks || {};
  (this._callbacks[event] = this._callbacks[event] || []).push(fn);
  return this;
};
/**
 * Adds an `event` listener that will be invoked a single
 * time then automatically removed.
 *
 * @param {String} event
 * @param {Function} fn
 * @return {Emitter}
 * @api public
 */


Emitter.prototype.once = function (event, fn) {
  var self = this;
  this._callbacks = this._callbacks || {};

  function on() {
    self.off(event, on);
    fn.apply(this, arguments);
  }

  on.fn = fn;
  this.on(event, on);
  return this;
};
/**
 * Remove the given callback for `event` or all
 * registered callbacks.
 *
 * @param {String} event
 * @param {Function} fn
 * @return {Emitter}
 * @api public
 */


Emitter.prototype.off = Emitter.prototype.removeListener = Emitter.prototype.removeAllListeners = Emitter.prototype.removeEventListener = function (event, fn) {
  this._callbacks = this._callbacks || {}; // all

  if (0 == arguments.length) {
    this._callbacks = {};
    return this;
  } // specific event


  var callbacks = this._callbacks[event];
  if (!callbacks) return this; // remove all handlers

  if (1 == arguments.length) {
    delete this._callbacks[event];
    return this;
  } // remove specific handler


  var cb;

  for (var i = 0; i < callbacks.length; i++) {
    cb = callbacks[i];

    if (cb === fn || cb.fn === fn) {
      callbacks.splice(i, 1);
      break;
    }
  }

  return this;
};
/**
 * Emit `event` with the given args.
 *
 * @param {String} event
 * @param {Mixed} ...
 * @return {Emitter}
 */


Emitter.prototype.emit = function (event) {
  this._callbacks = this._callbacks || {};
  var args = [].slice.call(arguments, 1),
      callbacks = this._callbacks[event];

  if (callbacks) {
    callbacks = callbacks.slice(0);

    for (var i = 0, len = callbacks.length; i < len; ++i) {
      callbacks[i].apply(this, args);
    }
  }

  return this;
};
/**
 * Return array of callbacks for `event`.
 *
 * @param {String} event
 * @return {Array}
 * @api public
 */


Emitter.prototype.listeners = function (event) {
  this._callbacks = this._callbacks || {};
  return this._callbacks[event] || [];
};
/**
 * Check if this emitter has `event` handlers.
 *
 * @param {String} event
 * @return {Boolean}
 * @api public
 */


Emitter.prototype.hasListeners = function (event) {
  return !!this.listeners(event).length;
};

var propagating = createCommonjsModule$1(function (module, exports) {

  (function (factory) {
    {
      // Node. Does not work with strict CommonJS, but
      // only CommonJS-like environments that support module.exports,
      // like Node.
      module.exports = factory();
    }
  })(function () {
    var _firstTarget = null; // singleton, will contain the target element where the touch event started

    /**
     * Extend an Hammer.js instance with event propagation.
     *
     * Features:
     * - Events emitted by hammer will propagate in order from child to parent
     *   elements.
     * - Events are extended with a function `event.stopPropagation()` to stop
     *   propagation to parent elements.
     * - An option `preventDefault` to stop all default browser behavior.
     *
     * Usage:
     *   var hammer = propagatingHammer(new Hammer(element));
     *   var hammer = propagatingHammer(new Hammer(element), {preventDefault: true});
     *
     * @param {Hammer.Manager} hammer   An hammer instance.
     * @param {Object} [options]        Available options:
     *                                  - `preventDefault: true | false | 'mouse' | 'touch' | 'pen'`.
     *                                    Enforce preventing the default browser behavior.
     *                                    Cannot be set to `false`.
     * @return {Hammer.Manager} Returns the same hammer instance with extended
     *                          functionality
     */

    return function propagating(hammer, options) {
      var _options = options || {
        preventDefault: false
      };

      if (hammer.Manager) {
        // This looks like the Hammer constructor.
        // Overload the constructors with our own.
        var Hammer = hammer;

        var PropagatingHammer = function (element, options) {
          var o = Object.create(_options);
          if (options) Hammer.assign(o, options);
          return propagating(new Hammer(element, o), o);
        };

        Hammer.assign(PropagatingHammer, Hammer);

        PropagatingHammer.Manager = function (element, options) {
          var o = Object.create(_options);
          if (options) Hammer.assign(o, options);
          return propagating(new Hammer.Manager(element, o), o);
        };

        return PropagatingHammer;
      } // create a wrapper object which will override the functions
      // `on`, `off`, `destroy`, and `emit` of the hammer instance


      var wrapper = Object.create(hammer); // attach to DOM element

      var element = hammer.element;
      if (!element.hammer) element.hammer = [];
      element.hammer.push(wrapper); // register an event to catch the start of a gesture and store the
      // target in a singleton

      hammer.on('hammer.input', function (event) {
        if (_options.preventDefault === true || _options.preventDefault === event.pointerType) {
          event.preventDefault();
        }

        if (event.isFirst) {
          _firstTarget = event.target;
        }
      });
      /** @type {Object.<String, Array.<function>>} */

      wrapper._handlers = {};
      /**
       * Register a handler for one or multiple events
       * @param {String} events    A space separated string with events
       * @param {function} handler A callback function, called as handler(event)
       * @returns {Hammer.Manager} Returns the hammer instance
       */

      wrapper.on = function (events, handler) {
        // register the handler
        split(events).forEach(function (event) {
          var _handlers = wrapper._handlers[event];

          if (!_handlers) {
            wrapper._handlers[event] = _handlers = []; // register the static, propagated handler

            hammer.on(event, propagatedHandler);
          }

          _handlers.push(handler);
        });
        return wrapper;
      };
      /**
       * Unregister a handler for one or multiple events
       * @param {String} events      A space separated string with events
       * @param {function} [handler] Optional. The registered handler. If not
       *                             provided, all handlers for given events
       *                             are removed.
       * @returns {Hammer.Manager}   Returns the hammer instance
       */


      wrapper.off = function (events, handler) {
        // unregister the handler
        split(events).forEach(function (event) {
          var _handlers = wrapper._handlers[event];

          if (_handlers) {
            _handlers = handler ? _handlers.filter(function (h) {
              return h !== handler;
            }) : [];

            if (_handlers.length > 0) {
              wrapper._handlers[event] = _handlers;
            } else {
              // remove static, propagated handler
              hammer.off(event, propagatedHandler);
              delete wrapper._handlers[event];
            }
          }
        });
        return wrapper;
      };
      /**
       * Emit to the event listeners
       * @param {string} eventType
       * @param {Event} event
       */


      wrapper.emit = function (eventType, event) {
        _firstTarget = event.target;
        hammer.emit(eventType, event);
      };

      wrapper.destroy = function () {
        // Detach from DOM element
        var hammers = hammer.element.hammer;
        var idx = hammers.indexOf(wrapper);
        if (idx !== -1) hammers.splice(idx, 1);
        if (!hammers.length) delete hammer.element.hammer; // clear all handlers

        wrapper._handlers = {}; // call original hammer destroy

        hammer.destroy();
      }; // split a string with space separated words


      function split(events) {
        return events.match(/[^ ]+/g);
      }
      /**
       * A static event handler, applying event propagation.
       * @param {Object} event
       */


      function propagatedHandler(event) {
        // let only a single hammer instance handle this event
        if (event.type !== 'hammer.input') {
          // it is possible that the same srcEvent is used with multiple hammer events,
          // we keep track on which events are handled in an object _handled
          if (!event.srcEvent._handled) {
            event.srcEvent._handled = {};
          }

          if (event.srcEvent._handled[event.type]) {
            return;
          } else {
            event.srcEvent._handled[event.type] = true;
          }
        } // attach a stopPropagation function to the event


        var stopped = false;

        event.stopPropagation = function () {
          stopped = true;
        }; //wrap the srcEvent's stopPropagation to also stop hammer propagation:


        var srcStop = event.srcEvent.stopPropagation.bind(event.srcEvent);

        if (typeof srcStop == "function") {
          event.srcEvent.stopPropagation = function () {
            srcStop();
            event.stopPropagation();
          };
        } // attach firstTarget property to the event


        event.firstTarget = _firstTarget; // propagate over all elements (until stopped)

        var elem = _firstTarget;

        while (elem && !stopped) {
          var elemHammer = elem.hammer;

          if (elemHammer) {
            var _handlers;

            for (var k = 0; k < elemHammer.length; k++) {
              _handlers = elemHammer[k]._handlers[event.type];
              if (_handlers) for (var i = 0; i < _handlers.length && !stopped; i++) {
                _handlers[i](event);
              }
            }
          }

          elem = elem.parentNode;
        }
      }

      return wrapper;
    };
  });
});

var hammer = createCommonjsModule$1(function (module) {
  /*! Hammer.JS - v2.0.7 - 2016-04-22
   * http://hammerjs.github.io/
   *
   * Copyright (c) 2016 Jorik Tangelder;
   * Licensed under the MIT license */
  (function (window, document, exportName, undefined$1) {

    var VENDOR_PREFIXES = ['', 'webkit', 'Moz', 'MS', 'ms', 'o'];
    var TEST_ELEMENT = document.createElement('div');
    var TYPE_FUNCTION = 'function';
    var round = Math.round;
    var abs = Math.abs;
    var now = Date.now;
    /**
     * set a timeout with a given scope
     * @param {Function} fn
     * @param {Number} timeout
     * @param {Object} context
     * @returns {number}
     */

    function setTimeoutContext(fn, timeout, context) {
      return setTimeout(bindFn(fn, context), timeout);
    }
    /**
     * if the argument is an array, we want to execute the fn on each entry
     * if it aint an array we don't want to do a thing.
     * this is used by all the methods that accept a single and array argument.
     * @param {*|Array} arg
     * @param {String} fn
     * @param {Object} [context]
     * @returns {Boolean}
     */


    function invokeArrayArg(arg, fn, context) {
      if (Array.isArray(arg)) {
        each(arg, context[fn], context);
        return true;
      }

      return false;
    }
    /**
     * walk objects and arrays
     * @param {Object} obj
     * @param {Function} iterator
     * @param {Object} context
     */


    function each(obj, iterator, context) {
      var i;

      if (!obj) {
        return;
      }

      if (obj.forEach) {
        obj.forEach(iterator, context);
      } else if (obj.length !== undefined$1) {
        i = 0;

        while (i < obj.length) {
          iterator.call(context, obj[i], i, obj);
          i++;
        }
      } else {
        for (i in obj) {
          obj.hasOwnProperty(i) && iterator.call(context, obj[i], i, obj);
        }
      }
    }
    /**
     * wrap a method with a deprecation warning and stack trace
     * @param {Function} method
     * @param {String} name
     * @param {String} message
     * @returns {Function} A new function wrapping the supplied method.
     */


    function deprecate(method, name, message) {
      var deprecationMessage = 'DEPRECATED METHOD: ' + name + '\n' + message + ' AT \n';
      return function () {
        var e = new Error('get-stack-trace');
        var stack = e && e.stack ? e.stack.replace(/^[^\(]+?[\n$]/gm, '').replace(/^\s+at\s+/gm, '').replace(/^Object.<anonymous>\s*\(/gm, '{anonymous}()@') : 'Unknown Stack Trace';
        var log = window.console && (window.console.warn || window.console.log);

        if (log) {
          log.call(window.console, deprecationMessage, stack);
        }

        return method.apply(this, arguments);
      };
    }
    /**
     * extend object.
     * means that properties in dest will be overwritten by the ones in src.
     * @param {Object} target
     * @param {...Object} objects_to_assign
     * @returns {Object} target
     */


    var assign;

    if (typeof Object.assign !== 'function') {
      assign = function assign(target) {
        if (target === undefined$1 || target === null) {
          throw new TypeError('Cannot convert undefined or null to object');
        }

        var output = Object(target);

        for (var index = 1; index < arguments.length; index++) {
          var source = arguments[index];

          if (source !== undefined$1 && source !== null) {
            for (var nextKey in source) {
              if (source.hasOwnProperty(nextKey)) {
                output[nextKey] = source[nextKey];
              }
            }
          }
        }

        return output;
      };
    } else {
      assign = Object.assign;
    }
    /**
     * extend object.
     * means that properties in dest will be overwritten by the ones in src.
     * @param {Object} dest
     * @param {Object} src
     * @param {Boolean} [merge=false]
     * @returns {Object} dest
     */


    var extend = deprecate(function extend(dest, src, merge) {
      var keys = Object.keys(src);
      var i = 0;

      while (i < keys.length) {
        if (!merge || merge && dest[keys[i]] === undefined$1) {
          dest[keys[i]] = src[keys[i]];
        }

        i++;
      }

      return dest;
    }, 'extend', 'Use `assign`.');
    /**
     * merge the values from src in the dest.
     * means that properties that exist in dest will not be overwritten by src
     * @param {Object} dest
     * @param {Object} src
     * @returns {Object} dest
     */

    var merge = deprecate(function merge(dest, src) {
      return extend(dest, src, true);
    }, 'merge', 'Use `assign`.');
    /**
     * simple class inheritance
     * @param {Function} child
     * @param {Function} base
     * @param {Object} [properties]
     */

    function inherit(child, base, properties) {
      var baseP = base.prototype,
          childP;
      childP = child.prototype = Object.create(baseP);
      childP.constructor = child;
      childP._super = baseP;

      if (properties) {
        assign(childP, properties);
      }
    }
    /**
     * simple function bind
     * @param {Function} fn
     * @param {Object} context
     * @returns {Function}
     */


    function bindFn(fn, context) {
      return function boundFn() {
        return fn.apply(context, arguments);
      };
    }
    /**
     * let a boolean value also be a function that must return a boolean
     * this first item in args will be used as the context
     * @param {Boolean|Function} val
     * @param {Array} [args]
     * @returns {Boolean}
     */


    function boolOrFn(val, args) {
      if (typeof val == TYPE_FUNCTION) {
        return val.apply(args ? args[0] || undefined$1 : undefined$1, args);
      }

      return val;
    }
    /**
     * use the val2 when val1 is undefined
     * @param {*} val1
     * @param {*} val2
     * @returns {*}
     */


    function ifUndefined(val1, val2) {
      return val1 === undefined$1 ? val2 : val1;
    }
    /**
     * addEventListener with multiple events at once
     * @param {EventTarget} target
     * @param {String} types
     * @param {Function} handler
     */


    function addEventListeners(target, types, handler) {
      each(splitStr(types), function (type) {
        target.addEventListener(type, handler, false);
      });
    }
    /**
     * removeEventListener with multiple events at once
     * @param {EventTarget} target
     * @param {String} types
     * @param {Function} handler
     */


    function removeEventListeners(target, types, handler) {
      each(splitStr(types), function (type) {
        target.removeEventListener(type, handler, false);
      });
    }
    /**
     * find if a node is in the given parent
     * @method hasParent
     * @param {HTMLElement} node
     * @param {HTMLElement} parent
     * @return {Boolean} found
     */


    function hasParent(node, parent) {
      while (node) {
        if (node == parent) {
          return true;
        }

        node = node.parentNode;
      }

      return false;
    }
    /**
     * small indexOf wrapper
     * @param {String} str
     * @param {String} find
     * @returns {Boolean} found
     */


    function inStr(str, find) {
      return str.indexOf(find) > -1;
    }
    /**
     * split string on whitespace
     * @param {String} str
     * @returns {Array} words
     */


    function splitStr(str) {
      return str.trim().split(/\s+/g);
    }
    /**
     * find if a array contains the object using indexOf or a simple polyFill
     * @param {Array} src
     * @param {String} find
     * @param {String} [findByKey]
     * @return {Boolean|Number} false when not found, or the index
     */


    function inArray(src, find, findByKey) {
      if (src.indexOf && !findByKey) {
        return src.indexOf(find);
      } else {
        var i = 0;

        while (i < src.length) {
          if (findByKey && src[i][findByKey] == find || !findByKey && src[i] === find) {
            return i;
          }

          i++;
        }

        return -1;
      }
    }
    /**
     * convert array-like objects to real arrays
     * @param {Object} obj
     * @returns {Array}
     */


    function toArray(obj) {
      return Array.prototype.slice.call(obj, 0);
    }
    /**
     * unique array with objects based on a key (like 'id') or just by the array's value
     * @param {Array} src [{id:1},{id:2},{id:1}]
     * @param {String} [key]
     * @param {Boolean} [sort=False]
     * @returns {Array} [{id:1},{id:2}]
     */


    function uniqueArray(src, key, sort) {
      var results = [];
      var values = [];
      var i = 0;

      while (i < src.length) {
        var val = key ? src[i][key] : src[i];

        if (inArray(values, val) < 0) {
          results.push(src[i]);
        }

        values[i] = val;
        i++;
      }

      if (sort) {
        if (!key) {
          results = results.sort();
        } else {
          results = results.sort(function sortUniqueArray(a, b) {
            return a[key] > b[key];
          });
        }
      }

      return results;
    }
    /**
     * get the prefixed property
     * @param {Object} obj
     * @param {String} property
     * @returns {String|Undefined} prefixed
     */


    function prefixed(obj, property) {
      var prefix, prop;
      var camelProp = property[0].toUpperCase() + property.slice(1);
      var i = 0;

      while (i < VENDOR_PREFIXES.length) {
        prefix = VENDOR_PREFIXES[i];
        prop = prefix ? prefix + camelProp : property;

        if (prop in obj) {
          return prop;
        }

        i++;
      }

      return undefined$1;
    }
    /**
     * get a unique id
     * @returns {number} uniqueId
     */


    var _uniqueId = 1;

    function uniqueId() {
      return _uniqueId++;
    }
    /**
     * get the window object of an element
     * @param {HTMLElement} element
     * @returns {DocumentView|Window}
     */


    function getWindowForElement(element) {
      var doc = element.ownerDocument || element;
      return doc.defaultView || doc.parentWindow || window;
    }

    var MOBILE_REGEX = /mobile|tablet|ip(ad|hone|od)|android/i;
    var SUPPORT_TOUCH = 'ontouchstart' in window;
    var SUPPORT_POINTER_EVENTS = prefixed(window, 'PointerEvent') !== undefined$1;
    var SUPPORT_ONLY_TOUCH = SUPPORT_TOUCH && MOBILE_REGEX.test(navigator.userAgent);
    var INPUT_TYPE_TOUCH = 'touch';
    var INPUT_TYPE_PEN = 'pen';
    var INPUT_TYPE_MOUSE = 'mouse';
    var INPUT_TYPE_KINECT = 'kinect';
    var COMPUTE_INTERVAL = 25;
    var INPUT_START = 1;
    var INPUT_MOVE = 2;
    var INPUT_END = 4;
    var INPUT_CANCEL = 8;
    var DIRECTION_NONE = 1;
    var DIRECTION_LEFT = 2;
    var DIRECTION_RIGHT = 4;
    var DIRECTION_UP = 8;
    var DIRECTION_DOWN = 16;
    var DIRECTION_HORIZONTAL = DIRECTION_LEFT | DIRECTION_RIGHT;
    var DIRECTION_VERTICAL = DIRECTION_UP | DIRECTION_DOWN;
    var DIRECTION_ALL = DIRECTION_HORIZONTAL | DIRECTION_VERTICAL;
    var PROPS_XY = ['x', 'y'];
    var PROPS_CLIENT_XY = ['clientX', 'clientY'];
    /**
     * create new input type manager
     * @param {Manager} manager
     * @param {Function} callback
     * @returns {Input}
     * @constructor
     */

    function Input(manager, callback) {
      var self = this;
      this.manager = manager;
      this.callback = callback;
      this.element = manager.element;
      this.target = manager.options.inputTarget; // smaller wrapper around the handler, for the scope and the enabled state of the manager,
      // so when disabled the input events are completely bypassed.

      this.domHandler = function (ev) {
        if (boolOrFn(manager.options.enable, [manager])) {
          self.handler(ev);
        }
      };

      this.init();
    }

    Input.prototype = {
      /**
       * should handle the inputEvent data and trigger the callback
       * @virtual
       */
      handler: function () {},

      /**
       * bind the events
       */
      init: function () {
        this.evEl && addEventListeners(this.element, this.evEl, this.domHandler);
        this.evTarget && addEventListeners(this.target, this.evTarget, this.domHandler);
        this.evWin && addEventListeners(getWindowForElement(this.element), this.evWin, this.domHandler);
      },

      /**
       * unbind the events
       */
      destroy: function () {
        this.evEl && removeEventListeners(this.element, this.evEl, this.domHandler);
        this.evTarget && removeEventListeners(this.target, this.evTarget, this.domHandler);
        this.evWin && removeEventListeners(getWindowForElement(this.element), this.evWin, this.domHandler);
      }
    };
    /**
     * create new input type manager
     * called by the Manager constructor
     * @param {Hammer} manager
     * @returns {Input}
     */

    function createInputInstance(manager) {
      var Type;
      var inputClass = manager.options.inputClass;

      if (inputClass) {
        Type = inputClass;
      } else if (SUPPORT_POINTER_EVENTS) {
        Type = PointerEventInput;
      } else if (SUPPORT_ONLY_TOUCH) {
        Type = TouchInput;
      } else if (!SUPPORT_TOUCH) {
        Type = MouseInput;
      } else {
        Type = TouchMouseInput;
      }

      return new Type(manager, inputHandler);
    }
    /**
     * handle input events
     * @param {Manager} manager
     * @param {String} eventType
     * @param {Object} input
     */


    function inputHandler(manager, eventType, input) {
      var pointersLen = input.pointers.length;
      var changedPointersLen = input.changedPointers.length;
      var isFirst = eventType & INPUT_START && pointersLen - changedPointersLen === 0;
      var isFinal = eventType & (INPUT_END | INPUT_CANCEL) && pointersLen - changedPointersLen === 0;
      input.isFirst = !!isFirst;
      input.isFinal = !!isFinal;

      if (isFirst) {
        manager.session = {};
      } // source event is the normalized value of the domEvents
      // like 'touchstart, mouseup, pointerdown'


      input.eventType = eventType; // compute scale, rotation etc

      computeInputData(manager, input); // emit secret event

      manager.emit('hammer.input', input);
      manager.recognize(input);
      manager.session.prevInput = input;
    }
    /**
     * extend the data with some usable properties like scale, rotate, velocity etc
     * @param {Object} manager
     * @param {Object} input
     */


    function computeInputData(manager, input) {
      var session = manager.session;
      var pointers = input.pointers;
      var pointersLength = pointers.length; // store the first input to calculate the distance and direction

      if (!session.firstInput) {
        session.firstInput = simpleCloneInputData(input);
      } // to compute scale and rotation we need to store the multiple touches


      if (pointersLength > 1 && !session.firstMultiple) {
        session.firstMultiple = simpleCloneInputData(input);
      } else if (pointersLength === 1) {
        session.firstMultiple = false;
      }

      var firstInput = session.firstInput;
      var firstMultiple = session.firstMultiple;
      var offsetCenter = firstMultiple ? firstMultiple.center : firstInput.center;
      var center = input.center = getCenter(pointers);
      input.timeStamp = now();
      input.deltaTime = input.timeStamp - firstInput.timeStamp;
      input.angle = getAngle(offsetCenter, center);
      input.distance = getDistance(offsetCenter, center);
      computeDeltaXY(session, input);
      input.offsetDirection = getDirection(input.deltaX, input.deltaY);
      var overallVelocity = getVelocity(input.deltaTime, input.deltaX, input.deltaY);
      input.overallVelocityX = overallVelocity.x;
      input.overallVelocityY = overallVelocity.y;
      input.overallVelocity = abs(overallVelocity.x) > abs(overallVelocity.y) ? overallVelocity.x : overallVelocity.y;
      input.scale = firstMultiple ? getScale(firstMultiple.pointers, pointers) : 1;
      input.rotation = firstMultiple ? getRotation(firstMultiple.pointers, pointers) : 0;
      input.maxPointers = !session.prevInput ? input.pointers.length : input.pointers.length > session.prevInput.maxPointers ? input.pointers.length : session.prevInput.maxPointers;
      computeIntervalInputData(session, input); // find the correct target

      var target = manager.element;

      if (hasParent(input.srcEvent.target, target)) {
        target = input.srcEvent.target;
      }

      input.target = target;
    }

    function computeDeltaXY(session, input) {
      var center = input.center;
      var offset = session.offsetDelta || {};
      var prevDelta = session.prevDelta || {};
      var prevInput = session.prevInput || {};

      if (input.eventType === INPUT_START || prevInput.eventType === INPUT_END) {
        prevDelta = session.prevDelta = {
          x: prevInput.deltaX || 0,
          y: prevInput.deltaY || 0
        };
        offset = session.offsetDelta = {
          x: center.x,
          y: center.y
        };
      }

      input.deltaX = prevDelta.x + (center.x - offset.x);
      input.deltaY = prevDelta.y + (center.y - offset.y);
    }
    /**
     * velocity is calculated every x ms
     * @param {Object} session
     * @param {Object} input
     */


    function computeIntervalInputData(session, input) {
      var last = session.lastInterval || input,
          deltaTime = input.timeStamp - last.timeStamp,
          velocity,
          velocityX,
          velocityY,
          direction;

      if (input.eventType != INPUT_CANCEL && (deltaTime > COMPUTE_INTERVAL || last.velocity === undefined$1)) {
        var deltaX = input.deltaX - last.deltaX;
        var deltaY = input.deltaY - last.deltaY;
        var v = getVelocity(deltaTime, deltaX, deltaY);
        velocityX = v.x;
        velocityY = v.y;
        velocity = abs(v.x) > abs(v.y) ? v.x : v.y;
        direction = getDirection(deltaX, deltaY);
        session.lastInterval = input;
      } else {
        // use latest velocity info if it doesn't overtake a minimum period
        velocity = last.velocity;
        velocityX = last.velocityX;
        velocityY = last.velocityY;
        direction = last.direction;
      }

      input.velocity = velocity;
      input.velocityX = velocityX;
      input.velocityY = velocityY;
      input.direction = direction;
    }
    /**
     * create a simple clone from the input used for storage of firstInput and firstMultiple
     * @param {Object} input
     * @returns {Object} clonedInputData
     */


    function simpleCloneInputData(input) {
      // make a simple copy of the pointers because we will get a reference if we don't
      // we only need clientXY for the calculations
      var pointers = [];
      var i = 0;

      while (i < input.pointers.length) {
        pointers[i] = {
          clientX: round(input.pointers[i].clientX),
          clientY: round(input.pointers[i].clientY)
        };
        i++;
      }

      return {
        timeStamp: now(),
        pointers: pointers,
        center: getCenter(pointers),
        deltaX: input.deltaX,
        deltaY: input.deltaY
      };
    }
    /**
     * get the center of all the pointers
     * @param {Array} pointers
     * @return {Object} center contains `x` and `y` properties
     */


    function getCenter(pointers) {
      var pointersLength = pointers.length; // no need to loop when only one touch

      if (pointersLength === 1) {
        return {
          x: round(pointers[0].clientX),
          y: round(pointers[0].clientY)
        };
      }

      var x = 0,
          y = 0,
          i = 0;

      while (i < pointersLength) {
        x += pointers[i].clientX;
        y += pointers[i].clientY;
        i++;
      }

      return {
        x: round(x / pointersLength),
        y: round(y / pointersLength)
      };
    }
    /**
     * calculate the velocity between two points. unit is in px per ms.
     * @param {Number} deltaTime
     * @param {Number} x
     * @param {Number} y
     * @return {Object} velocity `x` and `y`
     */


    function getVelocity(deltaTime, x, y) {
      return {
        x: x / deltaTime || 0,
        y: y / deltaTime || 0
      };
    }
    /**
     * get the direction between two points
     * @param {Number} x
     * @param {Number} y
     * @return {Number} direction
     */


    function getDirection(x, y) {
      if (x === y) {
        return DIRECTION_NONE;
      }

      if (abs(x) >= abs(y)) {
        return x < 0 ? DIRECTION_LEFT : DIRECTION_RIGHT;
      }

      return y < 0 ? DIRECTION_UP : DIRECTION_DOWN;
    }
    /**
     * calculate the absolute distance between two points
     * @param {Object} p1 {x, y}
     * @param {Object} p2 {x, y}
     * @param {Array} [props] containing x and y keys
     * @return {Number} distance
     */


    function getDistance(p1, p2, props) {
      if (!props) {
        props = PROPS_XY;
      }

      var x = p2[props[0]] - p1[props[0]],
          y = p2[props[1]] - p1[props[1]];
      return Math.sqrt(x * x + y * y);
    }
    /**
     * calculate the angle between two coordinates
     * @param {Object} p1
     * @param {Object} p2
     * @param {Array} [props] containing x and y keys
     * @return {Number} angle
     */


    function getAngle(p1, p2, props) {
      if (!props) {
        props = PROPS_XY;
      }

      var x = p2[props[0]] - p1[props[0]],
          y = p2[props[1]] - p1[props[1]];
      return Math.atan2(y, x) * 180 / Math.PI;
    }
    /**
     * calculate the rotation degrees between two pointersets
     * @param {Array} start array of pointers
     * @param {Array} end array of pointers
     * @return {Number} rotation
     */


    function getRotation(start, end) {
      return getAngle(end[1], end[0], PROPS_CLIENT_XY) + getAngle(start[1], start[0], PROPS_CLIENT_XY);
    }
    /**
     * calculate the scale factor between two pointersets
     * no scale is 1, and goes down to 0 when pinched together, and bigger when pinched out
     * @param {Array} start array of pointers
     * @param {Array} end array of pointers
     * @return {Number} scale
     */


    function getScale(start, end) {
      return getDistance(end[0], end[1], PROPS_CLIENT_XY) / getDistance(start[0], start[1], PROPS_CLIENT_XY);
    }

    var MOUSE_INPUT_MAP = {
      mousedown: INPUT_START,
      mousemove: INPUT_MOVE,
      mouseup: INPUT_END
    };
    var MOUSE_ELEMENT_EVENTS = 'mousedown';
    var MOUSE_WINDOW_EVENTS = 'mousemove mouseup';
    /**
     * Mouse events input
     * @constructor
     * @extends Input
     */

    function MouseInput() {
      this.evEl = MOUSE_ELEMENT_EVENTS;
      this.evWin = MOUSE_WINDOW_EVENTS;
      this.pressed = false; // mousedown state

      Input.apply(this, arguments);
    }

    inherit(MouseInput, Input, {
      /**
       * handle mouse events
       * @param {Object} ev
       */
      handler: function MEhandler(ev) {
        var eventType = MOUSE_INPUT_MAP[ev.type]; // on start we want to have the left mouse button down

        if (eventType & INPUT_START && ev.button === 0) {
          this.pressed = true;
        }

        if (eventType & INPUT_MOVE && ev.which !== 1) {
          eventType = INPUT_END;
        } // mouse must be down


        if (!this.pressed) {
          return;
        }

        if (eventType & INPUT_END) {
          this.pressed = false;
        }

        this.callback(this.manager, eventType, {
          pointers: [ev],
          changedPointers: [ev],
          pointerType: INPUT_TYPE_MOUSE,
          srcEvent: ev
        });
      }
    });
    var POINTER_INPUT_MAP = {
      pointerdown: INPUT_START,
      pointermove: INPUT_MOVE,
      pointerup: INPUT_END,
      pointercancel: INPUT_CANCEL,
      pointerout: INPUT_CANCEL
    }; // in IE10 the pointer types is defined as an enum

    var IE10_POINTER_TYPE_ENUM = {
      2: INPUT_TYPE_TOUCH,
      3: INPUT_TYPE_PEN,
      4: INPUT_TYPE_MOUSE,
      5: INPUT_TYPE_KINECT // see https://twitter.com/jacobrossi/status/480596438489890816

    };
    var POINTER_ELEMENT_EVENTS = 'pointerdown';
    var POINTER_WINDOW_EVENTS = 'pointermove pointerup pointercancel'; // IE10 has prefixed support, and case-sensitive

    if (window.MSPointerEvent && !window.PointerEvent) {
      POINTER_ELEMENT_EVENTS = 'MSPointerDown';
      POINTER_WINDOW_EVENTS = 'MSPointerMove MSPointerUp MSPointerCancel';
    }
    /**
     * Pointer events input
     * @constructor
     * @extends Input
     */


    function PointerEventInput() {
      this.evEl = POINTER_ELEMENT_EVENTS;
      this.evWin = POINTER_WINDOW_EVENTS;
      Input.apply(this, arguments);
      this.store = this.manager.session.pointerEvents = [];
    }

    inherit(PointerEventInput, Input, {
      /**
       * handle mouse events
       * @param {Object} ev
       */
      handler: function PEhandler(ev) {
        var store = this.store;
        var removePointer = false;
        var eventTypeNormalized = ev.type.toLowerCase().replace('ms', '');
        var eventType = POINTER_INPUT_MAP[eventTypeNormalized];
        var pointerType = IE10_POINTER_TYPE_ENUM[ev.pointerType] || ev.pointerType;
        var isTouch = pointerType == INPUT_TYPE_TOUCH; // get index of the event in the store

        var storeIndex = inArray(store, ev.pointerId, 'pointerId'); // start and mouse must be down

        if (eventType & INPUT_START && (ev.button === 0 || isTouch)) {
          if (storeIndex < 0) {
            store.push(ev);
            storeIndex = store.length - 1;
          }
        } else if (eventType & (INPUT_END | INPUT_CANCEL)) {
          removePointer = true;
        } // it not found, so the pointer hasn't been down (so it's probably a hover)


        if (storeIndex < 0) {
          return;
        } // update the event in the store


        store[storeIndex] = ev;
        this.callback(this.manager, eventType, {
          pointers: store,
          changedPointers: [ev],
          pointerType: pointerType,
          srcEvent: ev
        });

        if (removePointer) {
          // remove from the store
          store.splice(storeIndex, 1);
        }
      }
    });
    var SINGLE_TOUCH_INPUT_MAP = {
      touchstart: INPUT_START,
      touchmove: INPUT_MOVE,
      touchend: INPUT_END,
      touchcancel: INPUT_CANCEL
    };
    var SINGLE_TOUCH_TARGET_EVENTS = 'touchstart';
    var SINGLE_TOUCH_WINDOW_EVENTS = 'touchstart touchmove touchend touchcancel';
    /**
     * Touch events input
     * @constructor
     * @extends Input
     */

    function SingleTouchInput() {
      this.evTarget = SINGLE_TOUCH_TARGET_EVENTS;
      this.evWin = SINGLE_TOUCH_WINDOW_EVENTS;
      this.started = false;
      Input.apply(this, arguments);
    }

    inherit(SingleTouchInput, Input, {
      handler: function TEhandler(ev) {
        var type = SINGLE_TOUCH_INPUT_MAP[ev.type]; // should we handle the touch events?

        if (type === INPUT_START) {
          this.started = true;
        }

        if (!this.started) {
          return;
        }

        var touches = normalizeSingleTouches.call(this, ev, type); // when done, reset the started state

        if (type & (INPUT_END | INPUT_CANCEL) && touches[0].length - touches[1].length === 0) {
          this.started = false;
        }

        this.callback(this.manager, type, {
          pointers: touches[0],
          changedPointers: touches[1],
          pointerType: INPUT_TYPE_TOUCH,
          srcEvent: ev
        });
      }
    });
    /**
     * @this {TouchInput}
     * @param {Object} ev
     * @param {Number} type flag
     * @returns {undefined|Array} [all, changed]
     */

    function normalizeSingleTouches(ev, type) {
      var all = toArray(ev.touches);
      var changed = toArray(ev.changedTouches);

      if (type & (INPUT_END | INPUT_CANCEL)) {
        all = uniqueArray(all.concat(changed), 'identifier', true);
      }

      return [all, changed];
    }

    var TOUCH_INPUT_MAP = {
      touchstart: INPUT_START,
      touchmove: INPUT_MOVE,
      touchend: INPUT_END,
      touchcancel: INPUT_CANCEL
    };
    var TOUCH_TARGET_EVENTS = 'touchstart touchmove touchend touchcancel';
    /**
     * Multi-user touch events input
     * @constructor
     * @extends Input
     */

    function TouchInput() {
      this.evTarget = TOUCH_TARGET_EVENTS;
      this.targetIds = {};
      Input.apply(this, arguments);
    }

    inherit(TouchInput, Input, {
      handler: function MTEhandler(ev) {
        var type = TOUCH_INPUT_MAP[ev.type];
        var touches = getTouches.call(this, ev, type);

        if (!touches) {
          return;
        }

        this.callback(this.manager, type, {
          pointers: touches[0],
          changedPointers: touches[1],
          pointerType: INPUT_TYPE_TOUCH,
          srcEvent: ev
        });
      }
    });
    /**
     * @this {TouchInput}
     * @param {Object} ev
     * @param {Number} type flag
     * @returns {undefined|Array} [all, changed]
     */

    function getTouches(ev, type) {
      var allTouches = toArray(ev.touches);
      var targetIds = this.targetIds; // when there is only one touch, the process can be simplified

      if (type & (INPUT_START | INPUT_MOVE) && allTouches.length === 1) {
        targetIds[allTouches[0].identifier] = true;
        return [allTouches, allTouches];
      }

      var i,
          targetTouches,
          changedTouches = toArray(ev.changedTouches),
          changedTargetTouches = [],
          target = this.target; // get target touches from touches

      targetTouches = allTouches.filter(function (touch) {
        return hasParent(touch.target, target);
      }); // collect touches

      if (type === INPUT_START) {
        i = 0;

        while (i < targetTouches.length) {
          targetIds[targetTouches[i].identifier] = true;
          i++;
        }
      } // filter changed touches to only contain touches that exist in the collected target ids


      i = 0;

      while (i < changedTouches.length) {
        if (targetIds[changedTouches[i].identifier]) {
          changedTargetTouches.push(changedTouches[i]);
        } // cleanup removed touches


        if (type & (INPUT_END | INPUT_CANCEL)) {
          delete targetIds[changedTouches[i].identifier];
        }

        i++;
      }

      if (!changedTargetTouches.length) {
        return;
      }

      return [// merge targetTouches with changedTargetTouches so it contains ALL touches, including 'end' and 'cancel'
      uniqueArray(targetTouches.concat(changedTargetTouches), 'identifier', true), changedTargetTouches];
    }
    /**
     * Combined touch and mouse input
     *
     * Touch has a higher priority then mouse, and while touching no mouse events are allowed.
     * This because touch devices also emit mouse events while doing a touch.
     *
     * @constructor
     * @extends Input
     */


    var DEDUP_TIMEOUT = 2500;
    var DEDUP_DISTANCE = 25;

    function TouchMouseInput() {
      Input.apply(this, arguments);
      var handler = bindFn(this.handler, this);
      this.touch = new TouchInput(this.manager, handler);
      this.mouse = new MouseInput(this.manager, handler);
      this.primaryTouch = null;
      this.lastTouches = [];
    }

    inherit(TouchMouseInput, Input, {
      /**
       * handle mouse and touch events
       * @param {Hammer} manager
       * @param {String} inputEvent
       * @param {Object} inputData
       */
      handler: function TMEhandler(manager, inputEvent, inputData) {
        var isTouch = inputData.pointerType == INPUT_TYPE_TOUCH,
            isMouse = inputData.pointerType == INPUT_TYPE_MOUSE;

        if (isMouse && inputData.sourceCapabilities && inputData.sourceCapabilities.firesTouchEvents) {
          return;
        } // when we're in a touch event, record touches to  de-dupe synthetic mouse event


        if (isTouch) {
          recordTouches.call(this, inputEvent, inputData);
        } else if (isMouse && isSyntheticEvent.call(this, inputData)) {
          return;
        }

        this.callback(manager, inputEvent, inputData);
      },

      /**
       * remove the event listeners
       */
      destroy: function destroy() {
        this.touch.destroy();
        this.mouse.destroy();
      }
    });

    function recordTouches(eventType, eventData) {
      if (eventType & INPUT_START) {
        this.primaryTouch = eventData.changedPointers[0].identifier;
        setLastTouch.call(this, eventData);
      } else if (eventType & (INPUT_END | INPUT_CANCEL)) {
        setLastTouch.call(this, eventData);
      }
    }

    function setLastTouch(eventData) {
      var touch = eventData.changedPointers[0];

      if (touch.identifier === this.primaryTouch) {
        var lastTouch = {
          x: touch.clientX,
          y: touch.clientY
        };
        this.lastTouches.push(lastTouch);
        var lts = this.lastTouches;

        var removeLastTouch = function () {
          var i = lts.indexOf(lastTouch);

          if (i > -1) {
            lts.splice(i, 1);
          }
        };

        setTimeout(removeLastTouch, DEDUP_TIMEOUT);
      }
    }

    function isSyntheticEvent(eventData) {
      var x = eventData.srcEvent.clientX,
          y = eventData.srcEvent.clientY;

      for (var i = 0; i < this.lastTouches.length; i++) {
        var t = this.lastTouches[i];
        var dx = Math.abs(x - t.x),
            dy = Math.abs(y - t.y);

        if (dx <= DEDUP_DISTANCE && dy <= DEDUP_DISTANCE) {
          return true;
        }
      }

      return false;
    }

    var PREFIXED_TOUCH_ACTION = prefixed(TEST_ELEMENT.style, 'touchAction');
    var NATIVE_TOUCH_ACTION = PREFIXED_TOUCH_ACTION !== undefined$1; // magical touchAction value

    var TOUCH_ACTION_COMPUTE = 'compute';
    var TOUCH_ACTION_AUTO = 'auto';
    var TOUCH_ACTION_MANIPULATION = 'manipulation'; // not implemented

    var TOUCH_ACTION_NONE = 'none';
    var TOUCH_ACTION_PAN_X = 'pan-x';
    var TOUCH_ACTION_PAN_Y = 'pan-y';
    var TOUCH_ACTION_MAP = getTouchActionProps();
    /**
     * Touch Action
     * sets the touchAction property or uses the js alternative
     * @param {Manager} manager
     * @param {String} value
     * @constructor
     */

    function TouchAction(manager, value) {
      this.manager = manager;
      this.set(value);
    }

    TouchAction.prototype = {
      /**
       * set the touchAction value on the element or enable the polyfill
       * @param {String} value
       */
      set: function (value) {
        // find out the touch-action by the event handlers
        if (value == TOUCH_ACTION_COMPUTE) {
          value = this.compute();
        }

        if (NATIVE_TOUCH_ACTION && this.manager.element.style && TOUCH_ACTION_MAP[value]) {
          this.manager.element.style[PREFIXED_TOUCH_ACTION] = value;
        }

        this.actions = value.toLowerCase().trim();
      },

      /**
       * just re-set the touchAction value
       */
      update: function () {
        this.set(this.manager.options.touchAction);
      },

      /**
       * compute the value for the touchAction property based on the recognizer's settings
       * @returns {String} value
       */
      compute: function () {
        var actions = [];
        each(this.manager.recognizers, function (recognizer) {
          if (boolOrFn(recognizer.options.enable, [recognizer])) {
            actions = actions.concat(recognizer.getTouchAction());
          }
        });
        return cleanTouchActions(actions.join(' '));
      },

      /**
       * this method is called on each input cycle and provides the preventing of the browser behavior
       * @param {Object} input
       */
      preventDefaults: function (input) {
        var srcEvent = input.srcEvent;
        var direction = input.offsetDirection; // if the touch action did prevented once this session

        if (this.manager.session.prevented) {
          srcEvent.preventDefault();
          return;
        }

        var actions = this.actions;
        var hasNone = inStr(actions, TOUCH_ACTION_NONE) && !TOUCH_ACTION_MAP[TOUCH_ACTION_NONE];
        var hasPanY = inStr(actions, TOUCH_ACTION_PAN_Y) && !TOUCH_ACTION_MAP[TOUCH_ACTION_PAN_Y];
        var hasPanX = inStr(actions, TOUCH_ACTION_PAN_X) && !TOUCH_ACTION_MAP[TOUCH_ACTION_PAN_X];

        if (hasNone) {
          //do not prevent defaults if this is a tap gesture
          var isTapPointer = input.pointers.length === 1;
          var isTapMovement = input.distance < 2;
          var isTapTouchTime = input.deltaTime < 250;

          if (isTapPointer && isTapMovement && isTapTouchTime) {
            return;
          }
        }

        if (hasPanX && hasPanY) {
          // `pan-x pan-y` means browser handles all scrolling/panning, do not prevent
          return;
        }

        if (hasNone || hasPanY && direction & DIRECTION_HORIZONTAL || hasPanX && direction & DIRECTION_VERTICAL) {
          return this.preventSrc(srcEvent);
        }
      },

      /**
       * call preventDefault to prevent the browser's default behavior (scrolling in most cases)
       * @param {Object} srcEvent
       */
      preventSrc: function (srcEvent) {
        this.manager.session.prevented = true;
        srcEvent.preventDefault();
      }
    };
    /**
     * when the touchActions are collected they are not a valid value, so we need to clean things up. *
     * @param {String} actions
     * @returns {*}
     */

    function cleanTouchActions(actions) {
      // none
      if (inStr(actions, TOUCH_ACTION_NONE)) {
        return TOUCH_ACTION_NONE;
      }

      var hasPanX = inStr(actions, TOUCH_ACTION_PAN_X);
      var hasPanY = inStr(actions, TOUCH_ACTION_PAN_Y); // if both pan-x and pan-y are set (different recognizers
      // for different directions, e.g. horizontal pan but vertical swipe?)
      // we need none (as otherwise with pan-x pan-y combined none of these
      // recognizers will work, since the browser would handle all panning

      if (hasPanX && hasPanY) {
        return TOUCH_ACTION_NONE;
      } // pan-x OR pan-y


      if (hasPanX || hasPanY) {
        return hasPanX ? TOUCH_ACTION_PAN_X : TOUCH_ACTION_PAN_Y;
      } // manipulation


      if (inStr(actions, TOUCH_ACTION_MANIPULATION)) {
        return TOUCH_ACTION_MANIPULATION;
      }

      return TOUCH_ACTION_AUTO;
    }

    function getTouchActionProps() {
      if (!NATIVE_TOUCH_ACTION) {
        return false;
      }

      var touchMap = {};
      var cssSupports = window.CSS && window.CSS.supports;
      ['auto', 'manipulation', 'pan-y', 'pan-x', 'pan-x pan-y', 'none'].forEach(function (val) {
        // If css.supports is not supported but there is native touch-action assume it supports
        // all values. This is the case for IE 10 and 11.
        touchMap[val] = cssSupports ? window.CSS.supports('touch-action', val) : true;
      });
      return touchMap;
    }
    /**
     * Recognizer flow explained; *
     * All recognizers have the initial state of POSSIBLE when a input session starts.
     * The definition of a input session is from the first input until the last input, with all it's movement in it. *
     * Example session for mouse-input: mousedown -> mousemove -> mouseup
     *
     * On each recognizing cycle (see Manager.recognize) the .recognize() method is executed
     * which determines with state it should be.
     *
     * If the recognizer has the state FAILED, CANCELLED or RECOGNIZED (equals ENDED), it is reset to
     * POSSIBLE to give it another change on the next cycle.
     *
     *               Possible
     *                  |
     *            +-----+---------------+
     *            |                     |
     *      +-----+-----+               |
     *      |           |               |
     *   Failed      Cancelled          |
     *                          +-------+------+
     *                          |              |
     *                      Recognized       Began
     *                                         |
     *                                      Changed
     *                                         |
     *                                  Ended/Recognized
     */


    var STATE_POSSIBLE = 1;
    var STATE_BEGAN = 2;
    var STATE_CHANGED = 4;
    var STATE_ENDED = 8;
    var STATE_RECOGNIZED = STATE_ENDED;
    var STATE_CANCELLED = 16;
    var STATE_FAILED = 32;
    /**
     * Recognizer
     * Every recognizer needs to extend from this class.
     * @constructor
     * @param {Object} options
     */

    function Recognizer(options) {
      this.options = assign({}, this.defaults, options || {});
      this.id = uniqueId();
      this.manager = null; // default is enable true

      this.options.enable = ifUndefined(this.options.enable, true);
      this.state = STATE_POSSIBLE;
      this.simultaneous = {};
      this.requireFail = [];
    }

    Recognizer.prototype = {
      /**
       * @virtual
       * @type {Object}
       */
      defaults: {},

      /**
       * set options
       * @param {Object} options
       * @return {Recognizer}
       */
      set: function (options) {
        assign(this.options, options); // also update the touchAction, in case something changed about the directions/enabled state

        this.manager && this.manager.touchAction.update();
        return this;
      },

      /**
       * recognize simultaneous with an other recognizer.
       * @param {Recognizer} otherRecognizer
       * @returns {Recognizer} this
       */
      recognizeWith: function (otherRecognizer) {
        if (invokeArrayArg(otherRecognizer, 'recognizeWith', this)) {
          return this;
        }

        var simultaneous = this.simultaneous;
        otherRecognizer = getRecognizerByNameIfManager(otherRecognizer, this);

        if (!simultaneous[otherRecognizer.id]) {
          simultaneous[otherRecognizer.id] = otherRecognizer;
          otherRecognizer.recognizeWith(this);
        }

        return this;
      },

      /**
       * drop the simultaneous link. it doesnt remove the link on the other recognizer.
       * @param {Recognizer} otherRecognizer
       * @returns {Recognizer} this
       */
      dropRecognizeWith: function (otherRecognizer) {
        if (invokeArrayArg(otherRecognizer, 'dropRecognizeWith', this)) {
          return this;
        }

        otherRecognizer = getRecognizerByNameIfManager(otherRecognizer, this);
        delete this.simultaneous[otherRecognizer.id];
        return this;
      },

      /**
       * recognizer can only run when an other is failing
       * @param {Recognizer} otherRecognizer
       * @returns {Recognizer} this
       */
      requireFailure: function (otherRecognizer) {
        if (invokeArrayArg(otherRecognizer, 'requireFailure', this)) {
          return this;
        }

        var requireFail = this.requireFail;
        otherRecognizer = getRecognizerByNameIfManager(otherRecognizer, this);

        if (inArray(requireFail, otherRecognizer) === -1) {
          requireFail.push(otherRecognizer);
          otherRecognizer.requireFailure(this);
        }

        return this;
      },

      /**
       * drop the requireFailure link. it does not remove the link on the other recognizer.
       * @param {Recognizer} otherRecognizer
       * @returns {Recognizer} this
       */
      dropRequireFailure: function (otherRecognizer) {
        if (invokeArrayArg(otherRecognizer, 'dropRequireFailure', this)) {
          return this;
        }

        otherRecognizer = getRecognizerByNameIfManager(otherRecognizer, this);
        var index = inArray(this.requireFail, otherRecognizer);

        if (index > -1) {
          this.requireFail.splice(index, 1);
        }

        return this;
      },

      /**
       * has require failures boolean
       * @returns {boolean}
       */
      hasRequireFailures: function () {
        return this.requireFail.length > 0;
      },

      /**
       * if the recognizer can recognize simultaneous with an other recognizer
       * @param {Recognizer} otherRecognizer
       * @returns {Boolean}
       */
      canRecognizeWith: function (otherRecognizer) {
        return !!this.simultaneous[otherRecognizer.id];
      },

      /**
       * You should use `tryEmit` instead of `emit` directly to check
       * that all the needed recognizers has failed before emitting.
       * @param {Object} input
       */
      emit: function (input) {
        var self = this;
        var state = this.state;

        function emit(event) {
          self.manager.emit(event, input);
        } // 'panstart' and 'panmove'


        if (state < STATE_ENDED) {
          emit(self.options.event + stateStr(state));
        }

        emit(self.options.event); // simple 'eventName' events

        if (input.additionalEvent) {
          // additional event(panleft, panright, pinchin, pinchout...)
          emit(input.additionalEvent);
        } // panend and pancancel


        if (state >= STATE_ENDED) {
          emit(self.options.event + stateStr(state));
        }
      },

      /**
       * Check that all the require failure recognizers has failed,
       * if true, it emits a gesture event,
       * otherwise, setup the state to FAILED.
       * @param {Object} input
       */
      tryEmit: function (input) {
        if (this.canEmit()) {
          return this.emit(input);
        } // it's failing anyway


        this.state = STATE_FAILED;
      },

      /**
       * can we emit?
       * @returns {boolean}
       */
      canEmit: function () {
        var i = 0;

        while (i < this.requireFail.length) {
          if (!(this.requireFail[i].state & (STATE_FAILED | STATE_POSSIBLE))) {
            return false;
          }

          i++;
        }

        return true;
      },

      /**
       * update the recognizer
       * @param {Object} inputData
       */
      recognize: function (inputData) {
        // make a new copy of the inputData
        // so we can change the inputData without messing up the other recognizers
        var inputDataClone = assign({}, inputData); // is is enabled and allow recognizing?

        if (!boolOrFn(this.options.enable, [this, inputDataClone])) {
          this.reset();
          this.state = STATE_FAILED;
          return;
        } // reset when we've reached the end


        if (this.state & (STATE_RECOGNIZED | STATE_CANCELLED | STATE_FAILED)) {
          this.state = STATE_POSSIBLE;
        }

        this.state = this.process(inputDataClone); // the recognizer has recognized a gesture
        // so trigger an event

        if (this.state & (STATE_BEGAN | STATE_CHANGED | STATE_ENDED | STATE_CANCELLED)) {
          this.tryEmit(inputDataClone);
        }
      },

      /**
       * return the state of the recognizer
       * the actual recognizing happens in this method
       * @virtual
       * @param {Object} inputData
       * @returns {Const} STATE
       */
      process: function (inputData) {},
      // jshint ignore:line

      /**
       * return the preferred touch-action
       * @virtual
       * @returns {Array}
       */
      getTouchAction: function () {},

      /**
       * called when the gesture isn't allowed to recognize
       * like when another is being recognized or it is disabled
       * @virtual
       */
      reset: function () {}
    };
    /**
     * get a usable string, used as event postfix
     * @param {Const} state
     * @returns {String} state
     */

    function stateStr(state) {
      if (state & STATE_CANCELLED) {
        return 'cancel';
      } else if (state & STATE_ENDED) {
        return 'end';
      } else if (state & STATE_CHANGED) {
        return 'move';
      } else if (state & STATE_BEGAN) {
        return 'start';
      }

      return '';
    }
    /**
     * direction cons to string
     * @param {Const} direction
     * @returns {String}
     */


    function directionStr(direction) {
      if (direction == DIRECTION_DOWN) {
        return 'down';
      } else if (direction == DIRECTION_UP) {
        return 'up';
      } else if (direction == DIRECTION_LEFT) {
        return 'left';
      } else if (direction == DIRECTION_RIGHT) {
        return 'right';
      }

      return '';
    }
    /**
     * get a recognizer by name if it is bound to a manager
     * @param {Recognizer|String} otherRecognizer
     * @param {Recognizer} recognizer
     * @returns {Recognizer}
     */


    function getRecognizerByNameIfManager(otherRecognizer, recognizer) {
      var manager = recognizer.manager;

      if (manager) {
        return manager.get(otherRecognizer);
      }

      return otherRecognizer;
    }
    /**
     * This recognizer is just used as a base for the simple attribute recognizers.
     * @constructor
     * @extends Recognizer
     */


    function AttrRecognizer() {
      Recognizer.apply(this, arguments);
    }

    inherit(AttrRecognizer, Recognizer, {
      /**
       * @namespace
       * @memberof AttrRecognizer
       */
      defaults: {
        /**
         * @type {Number}
         * @default 1
         */
        pointers: 1
      },

      /**
       * Used to check if it the recognizer receives valid input, like input.distance > 10.
       * @memberof AttrRecognizer
       * @param {Object} input
       * @returns {Boolean} recognized
       */
      attrTest: function (input) {
        var optionPointers = this.options.pointers;
        return optionPointers === 0 || input.pointers.length === optionPointers;
      },

      /**
       * Process the input and return the state for the recognizer
       * @memberof AttrRecognizer
       * @param {Object} input
       * @returns {*} State
       */
      process: function (input) {
        var state = this.state;
        var eventType = input.eventType;
        var isRecognized = state & (STATE_BEGAN | STATE_CHANGED);
        var isValid = this.attrTest(input); // on cancel input and we've recognized before, return STATE_CANCELLED

        if (isRecognized && (eventType & INPUT_CANCEL || !isValid)) {
          return state | STATE_CANCELLED;
        } else if (isRecognized || isValid) {
          if (eventType & INPUT_END) {
            return state | STATE_ENDED;
          } else if (!(state & STATE_BEGAN)) {
            return STATE_BEGAN;
          }

          return state | STATE_CHANGED;
        }

        return STATE_FAILED;
      }
    });
    /**
     * Pan
     * Recognized when the pointer is down and moved in the allowed direction.
     * @constructor
     * @extends AttrRecognizer
     */

    function PanRecognizer() {
      AttrRecognizer.apply(this, arguments);
      this.pX = null;
      this.pY = null;
    }

    inherit(PanRecognizer, AttrRecognizer, {
      /**
       * @namespace
       * @memberof PanRecognizer
       */
      defaults: {
        event: 'pan',
        threshold: 10,
        pointers: 1,
        direction: DIRECTION_ALL
      },
      getTouchAction: function () {
        var direction = this.options.direction;
        var actions = [];

        if (direction & DIRECTION_HORIZONTAL) {
          actions.push(TOUCH_ACTION_PAN_Y);
        }

        if (direction & DIRECTION_VERTICAL) {
          actions.push(TOUCH_ACTION_PAN_X);
        }

        return actions;
      },
      directionTest: function (input) {
        var options = this.options;
        var hasMoved = true;
        var distance = input.distance;
        var direction = input.direction;
        var x = input.deltaX;
        var y = input.deltaY; // lock to axis?

        if (!(direction & options.direction)) {
          if (options.direction & DIRECTION_HORIZONTAL) {
            direction = x === 0 ? DIRECTION_NONE : x < 0 ? DIRECTION_LEFT : DIRECTION_RIGHT;
            hasMoved = x != this.pX;
            distance = Math.abs(input.deltaX);
          } else {
            direction = y === 0 ? DIRECTION_NONE : y < 0 ? DIRECTION_UP : DIRECTION_DOWN;
            hasMoved = y != this.pY;
            distance = Math.abs(input.deltaY);
          }
        }

        input.direction = direction;
        return hasMoved && distance > options.threshold && direction & options.direction;
      },
      attrTest: function (input) {
        return AttrRecognizer.prototype.attrTest.call(this, input) && (this.state & STATE_BEGAN || !(this.state & STATE_BEGAN) && this.directionTest(input));
      },
      emit: function (input) {
        this.pX = input.deltaX;
        this.pY = input.deltaY;
        var direction = directionStr(input.direction);

        if (direction) {
          input.additionalEvent = this.options.event + direction;
        }

        this._super.emit.call(this, input);
      }
    });
    /**
     * Pinch
     * Recognized when two or more pointers are moving toward (zoom-in) or away from each other (zoom-out).
     * @constructor
     * @extends AttrRecognizer
     */

    function PinchRecognizer() {
      AttrRecognizer.apply(this, arguments);
    }

    inherit(PinchRecognizer, AttrRecognizer, {
      /**
       * @namespace
       * @memberof PinchRecognizer
       */
      defaults: {
        event: 'pinch',
        threshold: 0,
        pointers: 2
      },
      getTouchAction: function () {
        return [TOUCH_ACTION_NONE];
      },
      attrTest: function (input) {
        return this._super.attrTest.call(this, input) && (Math.abs(input.scale - 1) > this.options.threshold || this.state & STATE_BEGAN);
      },
      emit: function (input) {
        if (input.scale !== 1) {
          var inOut = input.scale < 1 ? 'in' : 'out';
          input.additionalEvent = this.options.event + inOut;
        }

        this._super.emit.call(this, input);
      }
    });
    /**
     * Press
     * Recognized when the pointer is down for x ms without any movement.
     * @constructor
     * @extends Recognizer
     */

    function PressRecognizer() {
      Recognizer.apply(this, arguments);
      this._timer = null;
      this._input = null;
    }

    inherit(PressRecognizer, Recognizer, {
      /**
       * @namespace
       * @memberof PressRecognizer
       */
      defaults: {
        event: 'press',
        pointers: 1,
        time: 251,
        // minimal time of the pointer to be pressed
        threshold: 9 // a minimal movement is ok, but keep it low

      },
      getTouchAction: function () {
        return [TOUCH_ACTION_AUTO];
      },
      process: function (input) {
        var options = this.options;
        var validPointers = input.pointers.length === options.pointers;
        var validMovement = input.distance < options.threshold;
        var validTime = input.deltaTime > options.time;
        this._input = input; // we only allow little movement
        // and we've reached an end event, so a tap is possible

        if (!validMovement || !validPointers || input.eventType & (INPUT_END | INPUT_CANCEL) && !validTime) {
          this.reset();
        } else if (input.eventType & INPUT_START) {
          this.reset();
          this._timer = setTimeoutContext(function () {
            this.state = STATE_RECOGNIZED;
            this.tryEmit();
          }, options.time, this);
        } else if (input.eventType & INPUT_END) {
          return STATE_RECOGNIZED;
        }

        return STATE_FAILED;
      },
      reset: function () {
        clearTimeout(this._timer);
      },
      emit: function (input) {
        if (this.state !== STATE_RECOGNIZED) {
          return;
        }

        if (input && input.eventType & INPUT_END) {
          this.manager.emit(this.options.event + 'up', input);
        } else {
          this._input.timeStamp = now();
          this.manager.emit(this.options.event, this._input);
        }
      }
    });
    /**
     * Rotate
     * Recognized when two or more pointer are moving in a circular motion.
     * @constructor
     * @extends AttrRecognizer
     */

    function RotateRecognizer() {
      AttrRecognizer.apply(this, arguments);
    }

    inherit(RotateRecognizer, AttrRecognizer, {
      /**
       * @namespace
       * @memberof RotateRecognizer
       */
      defaults: {
        event: 'rotate',
        threshold: 0,
        pointers: 2
      },
      getTouchAction: function () {
        return [TOUCH_ACTION_NONE];
      },
      attrTest: function (input) {
        return this._super.attrTest.call(this, input) && (Math.abs(input.rotation) > this.options.threshold || this.state & STATE_BEGAN);
      }
    });
    /**
     * Swipe
     * Recognized when the pointer is moving fast (velocity), with enough distance in the allowed direction.
     * @constructor
     * @extends AttrRecognizer
     */

    function SwipeRecognizer() {
      AttrRecognizer.apply(this, arguments);
    }

    inherit(SwipeRecognizer, AttrRecognizer, {
      /**
       * @namespace
       * @memberof SwipeRecognizer
       */
      defaults: {
        event: 'swipe',
        threshold: 10,
        velocity: 0.3,
        direction: DIRECTION_HORIZONTAL | DIRECTION_VERTICAL,
        pointers: 1
      },
      getTouchAction: function () {
        return PanRecognizer.prototype.getTouchAction.call(this);
      },
      attrTest: function (input) {
        var direction = this.options.direction;
        var velocity;

        if (direction & (DIRECTION_HORIZONTAL | DIRECTION_VERTICAL)) {
          velocity = input.overallVelocity;
        } else if (direction & DIRECTION_HORIZONTAL) {
          velocity = input.overallVelocityX;
        } else if (direction & DIRECTION_VERTICAL) {
          velocity = input.overallVelocityY;
        }

        return this._super.attrTest.call(this, input) && direction & input.offsetDirection && input.distance > this.options.threshold && input.maxPointers == this.options.pointers && abs(velocity) > this.options.velocity && input.eventType & INPUT_END;
      },
      emit: function (input) {
        var direction = directionStr(input.offsetDirection);

        if (direction) {
          this.manager.emit(this.options.event + direction, input);
        }

        this.manager.emit(this.options.event, input);
      }
    });
    /**
     * A tap is ecognized when the pointer is doing a small tap/click. Multiple taps are recognized if they occur
     * between the given interval and position. The delay option can be used to recognize multi-taps without firing
     * a single tap.
     *
     * The eventData from the emitted event contains the property `tapCount`, which contains the amount of
     * multi-taps being recognized.
     * @constructor
     * @extends Recognizer
     */

    function TapRecognizer() {
      Recognizer.apply(this, arguments); // previous time and center,
      // used for tap counting

      this.pTime = false;
      this.pCenter = false;
      this._timer = null;
      this._input = null;
      this.count = 0;
    }

    inherit(TapRecognizer, Recognizer, {
      /**
       * @namespace
       * @memberof PinchRecognizer
       */
      defaults: {
        event: 'tap',
        pointers: 1,
        taps: 1,
        interval: 300,
        // max time between the multi-tap taps
        time: 250,
        // max time of the pointer to be down (like finger on the screen)
        threshold: 9,
        // a minimal movement is ok, but keep it low
        posThreshold: 10 // a multi-tap can be a bit off the initial position

      },
      getTouchAction: function () {
        return [TOUCH_ACTION_MANIPULATION];
      },
      process: function (input) {
        var options = this.options;
        var validPointers = input.pointers.length === options.pointers;
        var validMovement = input.distance < options.threshold;
        var validTouchTime = input.deltaTime < options.time;
        this.reset();

        if (input.eventType & INPUT_START && this.count === 0) {
          return this.failTimeout();
        } // we only allow little movement
        // and we've reached an end event, so a tap is possible


        if (validMovement && validTouchTime && validPointers) {
          if (input.eventType != INPUT_END) {
            return this.failTimeout();
          }

          var validInterval = this.pTime ? input.timeStamp - this.pTime < options.interval : true;
          var validMultiTap = !this.pCenter || getDistance(this.pCenter, input.center) < options.posThreshold;
          this.pTime = input.timeStamp;
          this.pCenter = input.center;

          if (!validMultiTap || !validInterval) {
            this.count = 1;
          } else {
            this.count += 1;
          }

          this._input = input; // if tap count matches we have recognized it,
          // else it has began recognizing...

          var tapCount = this.count % options.taps;

          if (tapCount === 0) {
            // no failing requirements, immediately trigger the tap event
            // or wait as long as the multitap interval to trigger
            if (!this.hasRequireFailures()) {
              return STATE_RECOGNIZED;
            } else {
              this._timer = setTimeoutContext(function () {
                this.state = STATE_RECOGNIZED;
                this.tryEmit();
              }, options.interval, this);
              return STATE_BEGAN;
            }
          }
        }

        return STATE_FAILED;
      },
      failTimeout: function () {
        this._timer = setTimeoutContext(function () {
          this.state = STATE_FAILED;
        }, this.options.interval, this);
        return STATE_FAILED;
      },
      reset: function () {
        clearTimeout(this._timer);
      },
      emit: function () {
        if (this.state == STATE_RECOGNIZED) {
          this._input.tapCount = this.count;
          this.manager.emit(this.options.event, this._input);
        }
      }
    });
    /**
     * Simple way to create a manager with a default set of recognizers.
     * @param {HTMLElement} element
     * @param {Object} [options]
     * @constructor
     */

    function Hammer(element, options) {
      options = options || {};
      options.recognizers = ifUndefined(options.recognizers, Hammer.defaults.preset);
      return new Manager(element, options);
    }
    /**
     * @const {string}
     */


    Hammer.VERSION = '2.0.7';
    /**
     * default settings
     * @namespace
     */

    Hammer.defaults = {
      /**
       * set if DOM events are being triggered.
       * But this is slower and unused by simple implementations, so disabled by default.
       * @type {Boolean}
       * @default false
       */
      domEvents: false,

      /**
       * The value for the touchAction property/fallback.
       * When set to `compute` it will magically set the correct value based on the added recognizers.
       * @type {String}
       * @default compute
       */
      touchAction: TOUCH_ACTION_COMPUTE,

      /**
       * @type {Boolean}
       * @default true
       */
      enable: true,

      /**
       * EXPERIMENTAL FEATURE -- can be removed/changed
       * Change the parent input target element.
       * If Null, then it is being set the to main element.
       * @type {Null|EventTarget}
       * @default null
       */
      inputTarget: null,

      /**
       * force an input class
       * @type {Null|Function}
       * @default null
       */
      inputClass: null,

      /**
       * Default recognizer setup when calling `Hammer()`
       * When creating a new Manager these will be skipped.
       * @type {Array}
       */
      preset: [// RecognizerClass, options, [recognizeWith, ...], [requireFailure, ...]
      [RotateRecognizer, {
        enable: false
      }], [PinchRecognizer, {
        enable: false
      }, ['rotate']], [SwipeRecognizer, {
        direction: DIRECTION_HORIZONTAL
      }], [PanRecognizer, {
        direction: DIRECTION_HORIZONTAL
      }, ['swipe']], [TapRecognizer], [TapRecognizer, {
        event: 'doubletap',
        taps: 2
      }, ['tap']], [PressRecognizer]],

      /**
       * Some CSS properties can be used to improve the working of Hammer.
       * Add them to this method and they will be set when creating a new Manager.
       * @namespace
       */
      cssProps: {
        /**
         * Disables text selection to improve the dragging gesture. Mainly for desktop browsers.
         * @type {String}
         * @default 'none'
         */
        userSelect: 'none',

        /**
         * Disable the Windows Phone grippers when pressing an element.
         * @type {String}
         * @default 'none'
         */
        touchSelect: 'none',

        /**
         * Disables the default callout shown when you touch and hold a touch target.
         * On iOS, when you touch and hold a touch target such as a link, Safari displays
         * a callout containing information about the link. This property allows you to disable that callout.
         * @type {String}
         * @default 'none'
         */
        touchCallout: 'none',

        /**
         * Specifies whether zooming is enabled. Used by IE10>
         * @type {String}
         * @default 'none'
         */
        contentZooming: 'none',

        /**
         * Specifies that an entire element should be draggable instead of its contents. Mainly for desktop browsers.
         * @type {String}
         * @default 'none'
         */
        userDrag: 'none',

        /**
         * Overrides the highlight color shown when the user taps a link or a JavaScript
         * clickable element in iOS. This property obeys the alpha value, if specified.
         * @type {String}
         * @default 'rgba(0,0,0,0)'
         */
        tapHighlightColor: 'rgba(0,0,0,0)'
      }
    };
    var STOP = 1;
    var FORCED_STOP = 2;
    /**
     * Manager
     * @param {HTMLElement} element
     * @param {Object} [options]
     * @constructor
     */

    function Manager(element, options) {
      this.options = assign({}, Hammer.defaults, options || {});
      this.options.inputTarget = this.options.inputTarget || element;
      this.handlers = {};
      this.session = {};
      this.recognizers = [];
      this.oldCssProps = {};
      this.element = element;
      this.input = createInputInstance(this);
      this.touchAction = new TouchAction(this, this.options.touchAction);
      toggleCssProps(this, true);
      each(this.options.recognizers, function (item) {
        var recognizer = this.add(new item[0](item[1]));
        item[2] && recognizer.recognizeWith(item[2]);
        item[3] && recognizer.requireFailure(item[3]);
      }, this);
    }

    Manager.prototype = {
      /**
       * set options
       * @param {Object} options
       * @returns {Manager}
       */
      set: function (options) {
        assign(this.options, options); // Options that need a little more setup

        if (options.touchAction) {
          this.touchAction.update();
        }

        if (options.inputTarget) {
          // Clean up existing event listeners and reinitialize
          this.input.destroy();
          this.input.target = options.inputTarget;
          this.input.init();
        }

        return this;
      },

      /**
       * stop recognizing for this session.
       * This session will be discarded, when a new [input]start event is fired.
       * When forced, the recognizer cycle is stopped immediately.
       * @param {Boolean} [force]
       */
      stop: function (force) {
        this.session.stopped = force ? FORCED_STOP : STOP;
      },

      /**
       * run the recognizers!
       * called by the inputHandler function on every movement of the pointers (touches)
       * it walks through all the recognizers and tries to detect the gesture that is being made
       * @param {Object} inputData
       */
      recognize: function (inputData) {
        var session = this.session;

        if (session.stopped) {
          return;
        } // run the touch-action polyfill


        this.touchAction.preventDefaults(inputData);
        var recognizer;
        var recognizers = this.recognizers; // this holds the recognizer that is being recognized.
        // so the recognizer's state needs to be BEGAN, CHANGED, ENDED or RECOGNIZED
        // if no recognizer is detecting a thing, it is set to `null`

        var curRecognizer = session.curRecognizer; // reset when the last recognizer is recognized
        // or when we're in a new session

        if (!curRecognizer || curRecognizer && curRecognizer.state & STATE_RECOGNIZED) {
          curRecognizer = session.curRecognizer = null;
        }

        var i = 0;

        while (i < recognizers.length) {
          recognizer = recognizers[i]; // find out if we are allowed try to recognize the input for this one.
          // 1.   allow if the session is NOT forced stopped (see the .stop() method)
          // 2.   allow if we still haven't recognized a gesture in this session, or the this recognizer is the one
          //      that is being recognized.
          // 3.   allow if the recognizer is allowed to run simultaneous with the current recognized recognizer.
          //      this can be setup with the `recognizeWith()` method on the recognizer.

          if (session.stopped !== FORCED_STOP && ( // 1
          !curRecognizer || recognizer == curRecognizer || // 2
          recognizer.canRecognizeWith(curRecognizer))) {
            // 3
            recognizer.recognize(inputData);
          } else {
            recognizer.reset();
          } // if the recognizer has been recognizing the input as a valid gesture, we want to store this one as the
          // current active recognizer. but only if we don't already have an active recognizer


          if (!curRecognizer && recognizer.state & (STATE_BEGAN | STATE_CHANGED | STATE_ENDED)) {
            curRecognizer = session.curRecognizer = recognizer;
          }

          i++;
        }
      },

      /**
       * get a recognizer by its event name.
       * @param {Recognizer|String} recognizer
       * @returns {Recognizer|Null}
       */
      get: function (recognizer) {
        if (recognizer instanceof Recognizer) {
          return recognizer;
        }

        var recognizers = this.recognizers;

        for (var i = 0; i < recognizers.length; i++) {
          if (recognizers[i].options.event == recognizer) {
            return recognizers[i];
          }
        }

        return null;
      },

      /**
       * add a recognizer to the manager
       * existing recognizers with the same event name will be removed
       * @param {Recognizer} recognizer
       * @returns {Recognizer|Manager}
       */
      add: function (recognizer) {
        if (invokeArrayArg(recognizer, 'add', this)) {
          return this;
        } // remove existing


        var existing = this.get(recognizer.options.event);

        if (existing) {
          this.remove(existing);
        }

        this.recognizers.push(recognizer);
        recognizer.manager = this;
        this.touchAction.update();
        return recognizer;
      },

      /**
       * remove a recognizer by name or instance
       * @param {Recognizer|String} recognizer
       * @returns {Manager}
       */
      remove: function (recognizer) {
        if (invokeArrayArg(recognizer, 'remove', this)) {
          return this;
        }

        recognizer = this.get(recognizer); // let's make sure this recognizer exists

        if (recognizer) {
          var recognizers = this.recognizers;
          var index = inArray(recognizers, recognizer);

          if (index !== -1) {
            recognizers.splice(index, 1);
            this.touchAction.update();
          }
        }

        return this;
      },

      /**
       * bind event
       * @param {String} events
       * @param {Function} handler
       * @returns {EventEmitter} this
       */
      on: function (events, handler) {
        if (events === undefined$1) {
          return;
        }

        if (handler === undefined$1) {
          return;
        }

        var handlers = this.handlers;
        each(splitStr(events), function (event) {
          handlers[event] = handlers[event] || [];
          handlers[event].push(handler);
        });
        return this;
      },

      /**
       * unbind event, leave emit blank to remove all handlers
       * @param {String} events
       * @param {Function} [handler]
       * @returns {EventEmitter} this
       */
      off: function (events, handler) {
        if (events === undefined$1) {
          return;
        }

        var handlers = this.handlers;
        each(splitStr(events), function (event) {
          if (!handler) {
            delete handlers[event];
          } else {
            handlers[event] && handlers[event].splice(inArray(handlers[event], handler), 1);
          }
        });
        return this;
      },

      /**
       * emit event to the listeners
       * @param {String} event
       * @param {Object} data
       */
      emit: function (event, data) {
        // we also want to trigger dom events
        if (this.options.domEvents) {
          triggerDomEvent(event, data);
        } // no handlers, so skip it all


        var handlers = this.handlers[event] && this.handlers[event].slice();

        if (!handlers || !handlers.length) {
          return;
        }

        data.type = event;

        data.preventDefault = function () {
          data.srcEvent.preventDefault();
        };

        var i = 0;

        while (i < handlers.length) {
          handlers[i](data);
          i++;
        }
      },

      /**
       * destroy the manager and unbinds all events
       * it doesn't unbind dom events, that is the user own responsibility
       */
      destroy: function () {
        this.element && toggleCssProps(this, false);
        this.handlers = {};
        this.session = {};
        this.input.destroy();
        this.element = null;
      }
    };
    /**
     * add/remove the css properties as defined in manager.options.cssProps
     * @param {Manager} manager
     * @param {Boolean} add
     */

    function toggleCssProps(manager, add) {
      var element = manager.element;

      if (!element.style) {
        return;
      }

      var prop;
      each(manager.options.cssProps, function (value, name) {
        prop = prefixed(element.style, name);

        if (add) {
          manager.oldCssProps[prop] = element.style[prop];
          element.style[prop] = value;
        } else {
          element.style[prop] = manager.oldCssProps[prop] || '';
        }
      });

      if (!add) {
        manager.oldCssProps = {};
      }
    }
    /**
     * trigger dom event
     * @param {String} event
     * @param {Object} data
     */


    function triggerDomEvent(event, data) {
      var gestureEvent = document.createEvent('Event');
      gestureEvent.initEvent(event, true, true);
      gestureEvent.gesture = data;
      data.target.dispatchEvent(gestureEvent);
    }

    assign(Hammer, {
      INPUT_START: INPUT_START,
      INPUT_MOVE: INPUT_MOVE,
      INPUT_END: INPUT_END,
      INPUT_CANCEL: INPUT_CANCEL,
      STATE_POSSIBLE: STATE_POSSIBLE,
      STATE_BEGAN: STATE_BEGAN,
      STATE_CHANGED: STATE_CHANGED,
      STATE_ENDED: STATE_ENDED,
      STATE_RECOGNIZED: STATE_RECOGNIZED,
      STATE_CANCELLED: STATE_CANCELLED,
      STATE_FAILED: STATE_FAILED,
      DIRECTION_NONE: DIRECTION_NONE,
      DIRECTION_LEFT: DIRECTION_LEFT,
      DIRECTION_RIGHT: DIRECTION_RIGHT,
      DIRECTION_UP: DIRECTION_UP,
      DIRECTION_DOWN: DIRECTION_DOWN,
      DIRECTION_HORIZONTAL: DIRECTION_HORIZONTAL,
      DIRECTION_VERTICAL: DIRECTION_VERTICAL,
      DIRECTION_ALL: DIRECTION_ALL,
      Manager: Manager,
      Input: Input,
      TouchAction: TouchAction,
      TouchInput: TouchInput,
      MouseInput: MouseInput,
      PointerEventInput: PointerEventInput,
      TouchMouseInput: TouchMouseInput,
      SingleTouchInput: SingleTouchInput,
      Recognizer: Recognizer,
      AttrRecognizer: AttrRecognizer,
      Tap: TapRecognizer,
      Pan: PanRecognizer,
      Swipe: SwipeRecognizer,
      Pinch: PinchRecognizer,
      Rotate: RotateRecognizer,
      Press: PressRecognizer,
      on: addEventListeners,
      off: removeEventListeners,
      each: each,
      merge: merge,
      extend: extend,
      assign: assign,
      inherit: inherit,
      bindFn: bindFn,
      prefixed: prefixed
    }); // this prevents errors when Hammer is loaded in the presence of an AMD
    //  style loader but by script tag, not by the loader.

    var freeGlobal = typeof window !== 'undefined' ? window : typeof self !== 'undefined' ? self : {}; // jshint ignore:line

    freeGlobal.Hammer = Hammer;

    if (typeof undefined$1 === 'function' && undefined$1.amd) {
      undefined$1(function () {
        return Hammer;
      });
    } else if ( module.exports) {
      module.exports = Hammer;
    } else {
      window[exportName] = Hammer;
    }
  })(window, document, 'Hammer');
});

var hammer$1 = createCommonjsModule$1(function (module) {
  /**
   * Setup a mock hammer.js object, for unit testing.
   *
   * Inspiration: https://github.com/uber/deck.gl/pull/658
   *
   * @returns {{on: noop, off: noop, destroy: noop, emit: noop, get: get}}
   */
  function hammerMock() {
    var noop = function noop() {};

    return {
      on: noop,
      off: noop,
      destroy: noop,
      emit: noop,
      get: function get(m) {
        //eslint-disable-line no-unused-vars
        return {
          set: noop
        };
      }
    };
  }

  if (typeof window !== 'undefined') {
    var propagating$1 = propagating;
    var Hammer = window['Hammer'] || hammer;
    module.exports = propagating$1(Hammer, {
      preventDefault: 'mouse'
    });
  } else {
    module.exports = function () {
      // hammer.js is only available in a browser, not in node.js. Replacing it with a mock object.
      return hammerMock();
    };
  }
});

var hammerUtil = createCommonjsModule$1(function (module, exports) {
  /**
   * Register a touch event, taking place before a gesture
   * @param {Hammer} hammer       A hammer instance
   * @param {function} callback   Callback, called as callback(event)
   */
  exports.onTouch = function (hammer, callback) {
    callback.inputHandler = function (event) {
      if (event.isFirst) {
        callback(event);
      }
    };

    hammer.on('hammer.input', callback.inputHandler);
  };
  /**
   * Register a release event, taking place after a gesture
   * @param {Hammer} hammer       A hammer instance
   * @param {function} callback   Callback, called as callback(event)
   * @returns {*}
   */


  exports.onRelease = function (hammer, callback) {
    callback.inputHandler = function (event) {
      if (event.isFinal) {
        callback(event);
      }
    };

    return hammer.on('hammer.input', callback.inputHandler);
  };
  /**
   * Unregister a touch event, taking place before a gesture
   * @param {Hammer} hammer       A hammer instance
   * @param {function} callback   Callback, called as callback(event)
   */


  exports.offTouch = function (hammer, callback) {
    hammer.off('hammer.input', callback.inputHandler);
  };
  /**
   * Unregister a release event, taking place before a gesture
   * @param {Hammer} hammer       A hammer instance
   * @param {function} callback   Callback, called as callback(event)
   */


  exports.offRelease = exports.offTouch;
  /**
   * Hack the PinchRecognizer such that it doesn't prevent default behavior
   * for vertical panning.
   *
   * Yeah ... this is quite a hack ... see https://github.com/hammerjs/hammer.js/issues/932
   *
   * @param {Hammer.Pinch} pinchRecognizer
   * @return {Hammer.Pinch} returns the pinchRecognizer
   */

  exports.disablePreventDefaultVertically = function (pinchRecognizer) {
    var TOUCH_ACTION_PAN_Y = 'pan-y';

    pinchRecognizer.getTouchAction = function () {
      // default method returns [TOUCH_ACTION_NONE]
      return [TOUCH_ACTION_PAN_Y];
    };

    return pinchRecognizer;
  };
});
var hammerUtil_1 = hammerUtil.onTouch;
var hammerUtil_2 = hammerUtil.onRelease;
var hammerUtil_3 = hammerUtil.offTouch;
var hammerUtil_4 = hammerUtil.offRelease;
var hammerUtil_5 = hammerUtil.disablePreventDefaultVertically;

/**
 * The class TimeStep is an iterator for dates. You provide a start date and an
 * end date. The class itself determines the best scale (step size) based on the
 * provided start Date, end Date, and minimumStep.
 *
 * If minimumStep is provided, the step size is chosen as close as possible
 * to the minimumStep but larger than minimumStep. If minimumStep is not
 * provided, the scale is set to 1 DAY.
 * The minimumStep should correspond with the onscreen size of about 6 characters
 *
 * Alternatively, you can set a scale by hand.
 * After creation, you can initialize the class by executing first(). Then you
 * can iterate from the start date to the end date via next(). You can check if
 * the end date is reached with the function hasNext(). After each step, you can
 * retrieve the current date via getCurrent().
 * The TimeStep has scales ranging from milliseconds, seconds, minutes, hours,
 * days, to years.
 *
 * Version: 1.2
 *
 * @param {Date} [start]         The start date, for example new Date(2010, 9, 21)
 *                               or new Date(2010, 9, 21, 23, 45, 00)
 * @param {Date} [end]           The end date
 * @param {number} [minimumStep] Optional. Minimum step size in milliseconds
 * @param {Date|Array.<Date>} [hiddenDates] Optional.
 * @param {{showMajorLabels: boolean}} [options] Optional.
 * @constructor  TimeStep
 */

function TimeStep(start, end, minimumStep, hiddenDates, options) {
  this.moment = moment$3; // variables

  this.current = this.moment();
  this._start = this.moment();
  this._end = this.moment();
  this.autoScale = true;
  this.scale = 'day';
  this.step = 1; // initialize the range

  this.setRange(start, end, minimumStep); // hidden Dates options

  this.switchedDay = false;
  this.switchedMonth = false;
  this.switchedYear = false;

  if (Array.isArray(hiddenDates)) {
    this.hiddenDates = hiddenDates;
  } else if (hiddenDates != undefined) {
    this.hiddenDates = [hiddenDates];
  } else {
    this.hiddenDates = [];
  }

  this.format = TimeStep.FORMAT; // default formatting

  this.options = options ? options : {};
} // Time formatting


TimeStep.FORMAT = {
  minorLabels: {
    millisecond: 'SSS',
    second: 's',
    minute: 'HH:mm',
    hour: 'HH:mm',
    weekday: 'ddd D',
    day: 'D',
    week: 'D',
    month: 'MMM',
    quarter: 'MMM',
    year: 'YYYY'
  },
  majorLabels: {
    millisecond: 'HH:mm:ss',
    second: 'D MMMM HH:mm',
    minute: 'ddd D MMMM',
    hour: 'ddd D MMMM',
    weekday: 'MMMM YYYY',
    day: 'MMMM YYYY',
    week: 'MMMM YYYY',
    month: 'YYYY',
    quarter: 'YYYY',
    year: ''
  }
};
/**
 * Set custom constructor function for moment. Can be used to set dates
 * to UTC or to set a utcOffset.
 * @param {function} moment
 */

TimeStep.prototype.setMoment = function (moment) {
  this.moment = moment; // update the date properties, can have a new utcOffset

  this.current = this.moment(this.current.valueOf());
  this._start = this.moment(this._start.valueOf());
  this._end = this.moment(this._end.valueOf());
};
/**
 * Set custom formatting for the minor an major labels of the TimeStep.
 * Both `minorLabels` and `majorLabels` are an Object with properties:
 * 'millisecond', 'second', 'minute', 'hour', 'weekday', 'day', 'week', 'month', 'quarter', 'year'.
 * @param {{minorLabels: Object, majorLabels: Object}} format
 */


TimeStep.prototype.setFormat = function (format) {
  var defaultFormat = util.deepExtend({}, TimeStep.FORMAT);
  this.format = util.deepExtend(defaultFormat, format);
};
/**
 * Set a new range
 * If minimumStep is provided, the step size is chosen as close as possible
 * to the minimumStep but larger than minimumStep. If minimumStep is not
 * provided, the scale is set to 1 DAY.
 * The minimumStep should correspond with the onscreen size of about 6 characters
 * @param {Date} [start]      The start date and time.
 * @param {Date} [end]        The end date and time.
 * @param {int} [minimumStep] Optional. Minimum step size in milliseconds
 */


TimeStep.prototype.setRange = function (start, end, minimumStep) {
  if (!(start instanceof Date) || !(end instanceof Date)) {
    throw "No legal start or end date in method setRange";
  }

  this._start = start != undefined ? this.moment(start.valueOf()) : new Date();
  this._end = end != undefined ? this.moment(end.valueOf()) : new Date();

  if (this.autoScale) {
    this.setMinimumStep(minimumStep);
  }
};
/**
 * Set the range iterator to the start date.
 */


TimeStep.prototype.start = function () {
  this.current = this._start.clone();
  this.roundToMinor();
};
/**
 * Round the current date to the first minor date value
 * This must be executed once when the current date is set to start Date
 */


TimeStep.prototype.roundToMinor = function () {
  // round to floor
  // to prevent year & month scales rounding down to the first day of week we perform this separately
  if (this.scale == 'week') {
    this.current.weekday(0);
  } // IMPORTANT: we have no breaks in this switch! (this is no bug)
  // noinspection FallThroughInSwitchStatementJS


  switch (this.scale) {
    case 'year':
      this.current.year(this.step * Math.floor(this.current.year() / this.step));
      this.current.month(0);

    case 'quarter':
      this.current.month(0);
    // eslint-disable-line no-fallthrough

    case 'month':
      this.current.date(1);
    // eslint-disable-line no-fallthrough

    case 'week': // eslint-disable-line no-fallthrough

    case 'day': // eslint-disable-line no-fallthrough

    case 'weekday':
      this.current.hours(0);
    // eslint-disable-line no-fallthrough

    case 'hour':
      this.current.minutes(0);
    // eslint-disable-line no-fallthrough

    case 'minute':
      this.current.seconds(0);
    // eslint-disable-line no-fallthrough

    case 'second':
      this.current.milliseconds(0);
    // eslint-disable-line no-fallthrough
    //case 'millisecond': // nothing to do for milliseconds
  }

  if (this.step != 1) {
    // round down to the first minor value that is a multiple of the current step size
    switch (this.scale) {
      case 'millisecond':
        this.current.subtract(this.current.milliseconds() % this.step, 'milliseconds');
        break;

      case 'second':
        this.current.subtract(this.current.seconds() % this.step, 'seconds');
        break;

      case 'minute':
        this.current.subtract(this.current.minutes() % this.step, 'minutes');
        break;

      case 'hour':
        this.current.subtract(this.current.hours() % this.step, 'hours');
        break;

      case 'weekday': // intentional fall through

      case 'day':
        this.current.subtract((this.current.date() - 1) % this.step, 'day');
        break;

      case 'week':
        this.current.subtract(this.current.week() % this.step, 'week');
        break;

      case 'month':
        this.current.subtract(this.current.month() % this.step, 'month');
        break;

      case 'quarter':
        this.current.subtract((this.current.quarter() - 1) % this.step, 'quarter');
        break;

      case 'year':
        this.current.subtract(this.current.year() % this.step, 'year');
        break;

      default:
        break;
    }
  }
};
/**
 * Check if the there is a next step
 * @return {boolean}  true if the current date has not passed the end date
 */


TimeStep.prototype.hasNext = function () {
  return this.current.valueOf() <= this._end.valueOf();
};
/**
 * Do the next step
 */


TimeStep.prototype.next = function () {
  var prev = this.current.valueOf(); // Two cases, needed to prevent issues with switching daylight savings
  // (end of March and end of October)

  switch (this.scale) {
    case 'millisecond':
      this.current.add(this.step, 'millisecond');
      break;

    case 'second':
      this.current.add(this.step, 'second');
      break;

    case 'minute':
      this.current.add(this.step, 'minute');
      break;

    case 'hour':
      this.current.add(this.step, 'hour');

      if (this.current.month() < 6) {
        this.current.subtract(this.current.hours() % this.step, 'hour');
      } else {
        if (this.current.hours() % this.step !== 0) {
          this.current.add(this.step - this.current.hours() % this.step, 'hour');
        }
      }

      break;

    case 'weekday': // intentional fall through

    case 'day':
      this.current.add(this.step, 'day');
      break;

    case 'week':
      if (this.current.weekday() !== 0) {
        // we had a month break not correlating with a week's start before
        this.current.weekday(0); // switch back to week cycles

        this.current.add(this.step, 'week');
      } else if (this.options.showMajorLabels === false) {
        this.current.add(this.step, 'week'); // the default case
      } else {
        // first day of the week
        var nextWeek = this.current.clone();
        nextWeek.add(1, 'week');

        if (nextWeek.isSame(this.current, 'month')) {
          // is the first day of the next week in the same month?
          this.current.add(this.step, 'week'); // the default case
        } else {
          // inject a step at each first day of the month
          this.current.add(this.step, 'week');
          this.current.date(1);
        }
      }

      break;

    case 'month':
      this.current.add(this.step, 'month');
      break;

    case 'quarter':
      this.current.add(this.step, 'quarter');
      break;

    case 'year':
      this.current.add(this.step, 'year');
      break;

    default:
      break;
  }

  if (this.step != 1) {
    // round down to the correct major value
    switch (this.scale) {
      case 'millisecond':
        if (this.current.milliseconds() > 0 && this.current.milliseconds() < this.step) this.current.milliseconds(0);
        break;

      case 'second':
        if (this.current.seconds() > 0 && this.current.seconds() < this.step) this.current.seconds(0);
        break;

      case 'minute':
        if (this.current.minutes() > 0 && this.current.minutes() < this.step) this.current.minutes(0);
        break;

      case 'hour':
        if (this.current.hours() > 0 && this.current.hours() < this.step) this.current.hours(0);
        break;

      case 'weekday': // intentional fall through

      case 'day':
        if (this.current.date() < this.step + 1) this.current.date(1);
        break;

      case 'week':
        if (this.current.week() < this.step) this.current.week(1);
        break;
      // week numbering starts at 1, not 0

      case 'month':
        if (this.current.month() < this.step) this.current.month(0);
        break;

      case 'quarter':
        if (this.current.quarter() < this.step + 1) this.current.quarter(1);
        break;

      case 'year':
        break;
      // nothing to do for year

      default:
        break;
    }
  } // safety mechanism: if current time is still unchanged, move to the end


  if (this.current.valueOf() == prev) {
    this.current = this._end.clone();
  } // Reset switches for year, month and day. Will get set to true where appropriate in DateUtil.stepOverHiddenDates


  this.switchedDay = false;
  this.switchedMonth = false;
  this.switchedYear = false;
  DateUtil.stepOverHiddenDates(this.moment, this, prev);
};
/**
 * Get the current datetime
 * @return {Moment}  current The current date
 */


TimeStep.prototype.getCurrent = function () {
  return this.current.clone();
};
/**
 * Set a custom scale. Autoscaling will be disabled.
 * For example setScale('minute', 5) will result
 * in minor steps of 5 minutes, and major steps of an hour.
 *
 * @param {{scale: string, step: number}} params
 *                               An object containing two properties:
 *                               - A string 'scale'. Choose from 'millisecond', 'second',
 *                                 'minute', 'hour', 'weekday', 'day', 'week', 'month', 'quarter, 'year'.
 *                               - A number 'step'. A step size, by default 1.
 *                                 Choose for example 1, 2, 5, or 10.
 */


TimeStep.prototype.setScale = function (params) {
  if (params && typeof params.scale == 'string') {
    this.scale = params.scale;
    this.step = params.step > 0 ? params.step : 1;
    this.autoScale = false;
  }
};
/**
 * Enable or disable autoscaling
 * @param {boolean} enable  If true, autoascaling is set true
 */


TimeStep.prototype.setAutoScale = function (enable) {
  this.autoScale = enable;
};
/**
 * Automatically determine the scale that bests fits the provided minimum step
 * @param {number} [minimumStep]  The minimum step size in milliseconds
 */


TimeStep.prototype.setMinimumStep = function (minimumStep) {
  if (minimumStep == undefined) {
    return;
  } //var b = asc + ds;


  var stepYear = 1000 * 60 * 60 * 24 * 30 * 12;
  var stepQuarter = 1000 * 60 * 60 * 24 * 30 * 3;
  var stepMonth = 1000 * 60 * 60 * 24 * 30;
  var stepDay = 1000 * 60 * 60 * 24;
  var stepHour = 1000 * 60 * 60;
  var stepMinute = 1000 * 60;
  var stepSecond = 1000;
  var stepMillisecond = 1; // find the smallest step that is larger than the provided minimumStep

  if (stepYear * 1000 > minimumStep) {
    this.scale = 'year';
    this.step = 1000;
  }

  if (stepYear * 500 > minimumStep) {
    this.scale = 'year';
    this.step = 500;
  }

  if (stepYear * 100 > minimumStep) {
    this.scale = 'year';
    this.step = 100;
  }

  if (stepYear * 50 > minimumStep) {
    this.scale = 'year';
    this.step = 50;
  }

  if (stepYear * 10 > minimumStep) {
    this.scale = 'year';
    this.step = 10;
  }

  if (stepYear * 5 > minimumStep) {
    this.scale = 'year';
    this.step = 5;
  }

  if (stepYear > minimumStep) {
    this.scale = 'year';
    this.step = 1;
  }

  if (stepQuarter > minimumStep) {
    this.scale = 'quarter';
    this.step = 1;
  }

  if (stepMonth > minimumStep) {
    this.scale = 'month';
    this.step = 1;
  }

  if (stepDay * 7 > minimumStep) {
    this.scale = 'week';
    this.step = 1;
  }

  if (stepDay * 2 > minimumStep) {
    this.scale = 'day';
    this.step = 2;
  }

  if (stepDay > minimumStep) {
    this.scale = 'day';
    this.step = 1;
  }

  if (stepDay / 2 > minimumStep) {
    this.scale = 'weekday';
    this.step = 1;
  }

  if (stepHour * 4 > minimumStep) {
    this.scale = 'hour';
    this.step = 4;
  }

  if (stepHour > minimumStep) {
    this.scale = 'hour';
    this.step = 1;
  }

  if (stepMinute * 15 > minimumStep) {
    this.scale = 'minute';
    this.step = 15;
  }

  if (stepMinute * 10 > minimumStep) {
    this.scale = 'minute';
    this.step = 10;
  }

  if (stepMinute * 5 > minimumStep) {
    this.scale = 'minute';
    this.step = 5;
  }

  if (stepMinute > minimumStep) {
    this.scale = 'minute';
    this.step = 1;
  }

  if (stepSecond * 15 > minimumStep) {
    this.scale = 'second';
    this.step = 15;
  }

  if (stepSecond * 10 > minimumStep) {
    this.scale = 'second';
    this.step = 10;
  }

  if (stepSecond * 5 > minimumStep) {
    this.scale = 'second';
    this.step = 5;
  }

  if (stepSecond > minimumStep) {
    this.scale = 'second';
    this.step = 1;
  }

  if (stepMillisecond * 200 > minimumStep) {
    this.scale = 'millisecond';
    this.step = 200;
  }

  if (stepMillisecond * 100 > minimumStep) {
    this.scale = 'millisecond';
    this.step = 100;
  }

  if (stepMillisecond * 50 > minimumStep) {
    this.scale = 'millisecond';
    this.step = 50;
  }

  if (stepMillisecond * 10 > minimumStep) {
    this.scale = 'millisecond';
    this.step = 10;
  }

  if (stepMillisecond * 5 > minimumStep) {
    this.scale = 'millisecond';
    this.step = 5;
  }

  if (stepMillisecond > minimumStep) {
    this.scale = 'millisecond';
    this.step = 1;
  }
};
/**
 * Snap a date to a rounded value.
 * The snap intervals are dependent on the current scale and step.
 * Static function
 * @param {Date} date    the date to be snapped.
 * @param {string} scale Current scale, can be 'millisecond', 'second',
 *                       'minute', 'hour', 'weekday, 'day', 'week', 'month', 'quarter', 'year'.
 * @param {number} step  Current step (1, 2, 4, 5, ...
 * @return {Date} snappedDate
 */


TimeStep.snap = function (date, scale, step) {
  var clone = moment$3(date);

  if (scale == 'year') {
    var year = clone.year() + Math.round(clone.month() / 12);
    clone.year(Math.round(year / step) * step);
    clone.month(0);
    clone.date(0);
    clone.hours(0);
    clone.minutes(0);
    clone.seconds(0);
    clone.milliseconds(0);
  } else if (scale == 'quarter') {
    if (clone.month() % 3 == 1 && clone.date() > 15 || clone.month() % 3 == 2) {
      clone.date(1);
      clone.month(Math.floor(clone.month() / 3) * 3);
      clone.add(1, 'quarter'); // important: first set Date to 1, after that change the month and the quarter.
    } else {
      clone.date(1);
      clone.month(Math.floor(clone.month() / 3) * 3);
    }

    clone.hours(0);
    clone.minutes(0);
    clone.seconds(0);
    clone.milliseconds(0);
  } else if (scale == 'month') {
    if (clone.date() > 15) {
      clone.date(1);
      clone.add(1, 'month'); // important: first set Date to 1, after that change the month.
    } else {
      clone.date(1);
    }

    clone.hours(0);
    clone.minutes(0);
    clone.seconds(0);
    clone.milliseconds(0);
  } else if (scale == 'week') {
    if (clone.weekday() > 2) {
      // doing it the momentjs locale aware way
      clone.weekday(0);
      clone.add(1, 'week');
    } else {
      clone.weekday(0);
    }

    clone.hours(0);
    clone.minutes(0);
    clone.seconds(0);
    clone.milliseconds(0);
  } else if (scale == 'day') {
    //noinspection FallthroughInSwitchStatementJS
    switch (step) {
      case 5:
      case 2:
        clone.hours(Math.round(clone.hours() / 24) * 24);
        break;

      default:
        clone.hours(Math.round(clone.hours() / 12) * 12);
        break;
    }

    clone.minutes(0);
    clone.seconds(0);
    clone.milliseconds(0);
  } else if (scale == 'weekday') {
    //noinspection FallthroughInSwitchStatementJS
    switch (step) {
      case 5:
      case 2:
        clone.hours(Math.round(clone.hours() / 12) * 12);
        break;

      default:
        clone.hours(Math.round(clone.hours() / 6) * 6);
        break;
    }

    clone.minutes(0);
    clone.seconds(0);
    clone.milliseconds(0);
  } else if (scale == 'hour') {
    switch (step) {
      case 4:
        clone.minutes(Math.round(clone.minutes() / 60) * 60);
        break;

      default:
        clone.minutes(Math.round(clone.minutes() / 30) * 30);
        break;
    }

    clone.seconds(0);
    clone.milliseconds(0);
  } else if (scale == 'minute') {
    //noinspection FallthroughInSwitchStatementJS
    switch (step) {
      case 15:
      case 10:
        clone.minutes(Math.round(clone.minutes() / 5) * 5);
        clone.seconds(0);
        break;

      case 5:
        clone.seconds(Math.round(clone.seconds() / 60) * 60);
        break;

      default:
        clone.seconds(Math.round(clone.seconds() / 30) * 30);
        break;
    }

    clone.milliseconds(0);
  } else if (scale == 'second') {
    //noinspection FallthroughInSwitchStatementJS
    switch (step) {
      case 15:
      case 10:
        clone.seconds(Math.round(clone.seconds() / 5) * 5);
        clone.milliseconds(0);
        break;

      case 5:
        clone.milliseconds(Math.round(clone.milliseconds() / 1000) * 1000);
        break;

      default:
        clone.milliseconds(Math.round(clone.milliseconds() / 500) * 500);
        break;
    }
  } else if (scale == 'millisecond') {
    var _step = step > 5 ? step / 2 : 1;

    clone.milliseconds(Math.round(clone.milliseconds() / _step) * _step);
  }

  return clone;
};
/**
 * Check if the current value is a major value (for example when the step
 * is DAY, a major value is each first day of the MONTH)
 * @return {boolean} true if current date is major, else false.
 */


TimeStep.prototype.isMajor = function () {
  if (this.switchedYear == true) {
    switch (this.scale) {
      case 'year':
      case 'quarter':
      case 'month':
      case 'week':
      case 'weekday':
      case 'day':
      case 'hour':
      case 'minute':
      case 'second':
      case 'millisecond':
        return true;

      default:
        return false;
    }
  } else if (this.switchedMonth == true) {
    switch (this.scale) {
      case 'week':
      case 'weekday':
      case 'day':
      case 'hour':
      case 'minute':
      case 'second':
      case 'millisecond':
        return true;

      default:
        return false;
    }
  } else if (this.switchedDay == true) {
    switch (this.scale) {
      case 'millisecond':
      case 'second':
      case 'minute':
      case 'hour':
        return true;

      default:
        return false;
    }
  }

  var date = this.moment(this.current);

  switch (this.scale) {
    case 'millisecond':
      return date.milliseconds() == 0;

    case 'second':
      return date.seconds() == 0;

    case 'minute':
      return date.hours() == 0 && date.minutes() == 0;

    case 'hour':
      return date.hours() == 0;

    case 'weekday': // intentional fall through

    case 'day':
      return date.date() == 1;

    case 'week':
      return date.date() == 1;

    case 'month':
      return date.month() == 0;

    case 'quarter':
      return date.quarter() == 1;

    case 'year':
      return false;

    default:
      return false;
  }
};
/**
 * Returns formatted text for the minor axislabel, depending on the current
 * date and the scale. For example when scale is MINUTE, the current time is
 * formatted as "hh:mm".
 * @param {Date} [date=this.current] custom date. if not provided, current date is taken
 * @returns {String}
 */


TimeStep.prototype.getLabelMinor = function (date) {
  if (date == undefined) {
    date = this.current;
  }

  if (date instanceof Date) {
    date = this.moment(date);
  }

  if (typeof this.format.minorLabels === "function") {
    return this.format.minorLabels(date, this.scale, this.step);
  }

  var format = this.format.minorLabels[this.scale]; // noinspection FallThroughInSwitchStatementJS

  switch (this.scale) {
    case 'week':
      if (this.isMajor() && date.weekday() !== 0) {
        return "";
      }

    default:
      // eslint-disable-line no-fallthrough
      return format && format.length > 0 ? this.moment(date).format(format) : '';
  }
};
/**
 * Returns formatted text for the major axis label, depending on the current
 * date and the scale. For example when scale is MINUTE, the major scale is
 * hours, and the hour will be formatted as "hh".
 * @param {Date} [date=this.current] custom date. if not provided, current date is taken
 * @returns {String}
 */


TimeStep.prototype.getLabelMajor = function (date) {
  if (date == undefined) {
    date = this.current;
  }

  if (date instanceof Date) {
    date = this.moment(date);
  }

  if (typeof this.format.majorLabels === "function") {
    return this.format.majorLabels(date, this.scale, this.step);
  }

  var format = this.format.majorLabels[this.scale];
  return format && format.length > 0 ? this.moment(date).format(format) : '';
};

TimeStep.prototype.getClassName = function () {
  var _moment = this.moment;
  var m = this.moment(this.current);
  var current = m.locale ? m.locale('en') : m.lang('en'); // old versions of moment have .lang() function

  var step = this.step;
  var classNames = [];
  /**
   *
   * @param {number} value
   * @returns {String}
   */

  function even(value) {
    return value / step % 2 == 0 ? ' vis-even' : ' vis-odd';
  }
  /**
   *
   * @param {Date} date
   * @returns {String}
   */


  function today(date) {
    if (date.isSame(new Date(), 'day')) {
      return ' vis-today';
    }

    if (date.isSame(_moment().add(1, 'day'), 'day')) {
      return ' vis-tomorrow';
    }

    if (date.isSame(_moment().add(-1, 'day'), 'day')) {
      return ' vis-yesterday';
    }

    return '';
  }
  /**
   *
   * @param {Date} date
   * @returns {String}
   */


  function currentWeek(date) {
    return date.isSame(new Date(), 'week') ? ' vis-current-week' : '';
  }
  /**
   *
   * @param {Date} date
   * @returns {String}
   */


  function currentMonth(date) {
    return date.isSame(new Date(), 'month') ? ' vis-current-month' : '';
  }
  /**
   *
   * @param {Date} date
   * @returns {String}
   */


  function currentQuarter(date) {
    return date.isSame(new Date(), 'quarter') ? ' vis-current-quarter' : '';
  }
  /**
   *
   * @param {Date} date
   * @returns {String}
   */


  function currentYear(date) {
    return date.isSame(new Date(), 'year') ? ' vis-current-year' : '';
  }

  switch (this.scale) {
    case 'millisecond':
      classNames.push(today(current));
      classNames.push(even(current.milliseconds()));
      break;

    case 'second':
      classNames.push(today(current));
      classNames.push(even(current.seconds()));
      break;

    case 'minute':
      classNames.push(today(current));
      classNames.push(even(current.minutes()));
      break;

    case 'hour':
      classNames.push('vis-h' + current.hours() + (this.step == 4 ? '-h' + (current.hours() + 4) : ''));
      classNames.push(today(current));
      classNames.push(even(current.hours()));
      break;

    case 'weekday':
      classNames.push('vis-' + current.format('dddd').toLowerCase());
      classNames.push(today(current));
      classNames.push(currentWeek(current));
      classNames.push(even(current.date()));
      break;

    case 'day':
      classNames.push('vis-day' + current.date());
      classNames.push('vis-' + current.format('MMMM').toLowerCase());
      classNames.push(today(current));
      classNames.push(currentMonth(current));
      classNames.push(this.step <= 2 ? today(current) : '');
      classNames.push(this.step <= 2 ? 'vis-' + current.format('dddd').toLowerCase() : '');
      classNames.push(even(current.date() - 1));
      break;

    case 'week':
      classNames.push('vis-week' + current.format('w'));
      classNames.push(currentWeek(current));
      classNames.push(even(current.week()));
      break;

    case 'month':
      classNames.push('vis-' + current.format('MMMM').toLowerCase());
      classNames.push(currentMonth(current));
      classNames.push(even(current.month()));
      break;

    case 'quarter':
      classNames.push('vis-q' + current.quarter());
      classNames.push(currentQuarter(current));
      classNames.push(even(current.quarter()));
      break;

    case 'year':
      classNames.push('vis-year' + current.year());
      classNames.push(currentYear(current));
      classNames.push(even(current.year()));
      break;
  }

  return classNames.filter(String).join(" ");
};

var TimeStep_1 = TimeStep;

/**
 * A horizontal time axis
 * @param {{dom: Object, domProps: Object, emitter: Emitter, range: Range}} body
 * @param {Object} [options]        See TimeAxis.setOptions for the available
 *                                  options.
 * @constructor TimeAxis
 * @extends Component
 */

function TimeAxis(body, options) {
  this.dom = {
    foreground: null,
    lines: [],
    majorTexts: [],
    minorTexts: [],
    redundant: {
      lines: [],
      majorTexts: [],
      minorTexts: []
    }
  };
  this.props = {
    range: {
      start: 0,
      end: 0,
      minimumStep: 0
    },
    lineTop: 0
  };
  this.defaultOptions = {
    orientation: {
      axis: 'bottom'
    },
    // axis orientation: 'top' or 'bottom'
    showMinorLabels: true,
    showMajorLabels: true,
    maxMinorChars: 7,
    format: TimeStep_1.FORMAT,
    moment: moment$3,
    timeAxis: null
  };
  this.options = util.extend({}, this.defaultOptions);
  this.body = body; // create the HTML DOM

  this._create();

  this.setOptions(options);
}

TimeAxis.prototype = new Component_1();
/**
 * Set options for the TimeAxis.
 * Parameters will be merged in current options.
 * @param {Object} options  Available options:
 *                          {string} [orientation.axis]
 *                          {boolean} [showMinorLabels]
 *                          {boolean} [showMajorLabels]
 */

TimeAxis.prototype.setOptions = function (options) {
  if (options) {
    // copy all options that we know
    util.selectiveExtend(['showMinorLabels', 'showMajorLabels', 'maxMinorChars', 'hiddenDates', 'timeAxis', 'moment', 'rtl'], this.options, options); // deep copy the format options

    util.selectiveDeepExtend(['format'], this.options, options);

    if ('orientation' in options) {
      if (typeof options.orientation === 'string') {
        this.options.orientation.axis = options.orientation;
      } else if (_typeof$1(options.orientation) === 'object' && 'axis' in options.orientation) {
        this.options.orientation.axis = options.orientation.axis;
      }
    } // apply locale to moment.js
    // TODO: not so nice, this is applied globally to moment.js


    if ('locale' in options) {
      if (typeof moment$3.locale === 'function') {
        // moment.js 2.8.1+
        moment$3.locale(options.locale);
      } else {
        moment$3.lang(options.locale);
      }
    }
  }
};
/**
 * Create the HTML DOM for the TimeAxis
 */


TimeAxis.prototype._create = function () {
  this.dom.foreground = document.createElement('div');
  this.dom.background = document.createElement('div');
  this.dom.foreground.className = 'vis-time-axis vis-foreground';
  this.dom.background.className = 'vis-time-axis vis-background';
};
/**
 * Destroy the TimeAxis
 */


TimeAxis.prototype.destroy = function () {
  // remove from DOM
  if (this.dom.foreground.parentNode) {
    this.dom.foreground.parentNode.removeChild(this.dom.foreground);
  }

  if (this.dom.background.parentNode) {
    this.dom.background.parentNode.removeChild(this.dom.background);
  }

  this.body = null;
};
/**
 * Repaint the component
 * @return {boolean} Returns true if the component is resized
 */


TimeAxis.prototype.redraw = function () {
  var props = this.props;
  var foreground = this.dom.foreground;
  var background = this.dom.background; // determine the correct parent DOM element (depending on option orientation)

  var parent = this.options.orientation.axis == 'top' ? this.body.dom.top : this.body.dom.bottom;
  var parentChanged = foreground.parentNode !== parent; // calculate character width and height

  this._calculateCharSize(); // TODO: recalculate sizes only needed when parent is resized or options is changed


  var showMinorLabels = this.options.showMinorLabels && this.options.orientation.axis !== 'none';
  var showMajorLabels = this.options.showMajorLabels && this.options.orientation.axis !== 'none'; // determine the width and height of the elemens for the axis

  props.minorLabelHeight = showMinorLabels ? props.minorCharHeight : 0;
  props.majorLabelHeight = showMajorLabels ? props.majorCharHeight : 0;
  props.height = props.minorLabelHeight + props.majorLabelHeight;
  props.width = foreground.offsetWidth;
  props.minorLineHeight = this.body.domProps.root.height - props.majorLabelHeight - (this.options.orientation.axis == 'top' ? this.body.domProps.bottom.height : this.body.domProps.top.height);
  props.minorLineWidth = 1; // TODO: really calculate width

  props.majorLineHeight = props.minorLineHeight + props.majorLabelHeight;
  props.majorLineWidth = 1; // TODO: really calculate width
  //  take foreground and background offline while updating (is almost twice as fast)

  var foregroundNextSibling = foreground.nextSibling;
  var backgroundNextSibling = background.nextSibling;
  foreground.parentNode && foreground.parentNode.removeChild(foreground);
  background.parentNode && background.parentNode.removeChild(background);
  foreground.style.height = this.props.height + 'px';

  this._repaintLabels(); // put DOM online again (at the same place)


  if (foregroundNextSibling) {
    parent.insertBefore(foreground, foregroundNextSibling);
  } else {
    parent.appendChild(foreground);
  }

  if (backgroundNextSibling) {
    this.body.dom.backgroundVertical.insertBefore(background, backgroundNextSibling);
  } else {
    this.body.dom.backgroundVertical.appendChild(background);
  }

  return this._isResized() || parentChanged;
};
/**
 * Repaint major and minor text labels and vertical grid lines
 * @private
 */


TimeAxis.prototype._repaintLabels = function () {
  var orientation = this.options.orientation.axis; // calculate range and step (step such that we have space for 7 characters per label)

  var start = util.convert(this.body.range.start, 'Number');
  var end = util.convert(this.body.range.end, 'Number');
  var timeLabelsize = this.body.util.toTime((this.props.minorCharWidth || 10) * this.options.maxMinorChars).valueOf();
  var minimumStep = timeLabelsize - DateUtil.getHiddenDurationBefore(this.options.moment, this.body.hiddenDates, this.body.range, timeLabelsize);
  minimumStep -= this.body.util.toTime(0).valueOf();
  var step = new TimeStep_1(new Date(start), new Date(end), minimumStep, this.body.hiddenDates, this.options);
  step.setMoment(this.options.moment);

  if (this.options.format) {
    step.setFormat(this.options.format);
  }

  if (this.options.timeAxis) {
    step.setScale(this.options.timeAxis);
  }

  this.step = step; // Move all DOM elements to a "redundant" list, where they
  // can be picked for re-use, and clear the lists with lines and texts.
  // At the end of the function _repaintLabels, left over elements will be cleaned up

  var dom = this.dom;
  dom.redundant.lines = dom.lines;
  dom.redundant.majorTexts = dom.majorTexts;
  dom.redundant.minorTexts = dom.minorTexts;
  dom.lines = [];
  dom.majorTexts = [];
  dom.minorTexts = [];
  var current;
  var next;
  var x;
  var xNext;
  var isMajor;
  var showMinorGrid;
  var width = 0,
      prevWidth;
  var line;
  var xFirstMajorLabel = undefined;
  var count = 0;
  var MAX = 1000;
  var className;
  step.start();
  next = step.getCurrent();
  xNext = this.body.util.toScreen(next);

  while (step.hasNext() && count < MAX) {
    count++;
    isMajor = step.isMajor();
    className = step.getClassName();
    current = next;
    x = xNext;
    step.next();
    next = step.getCurrent();
    xNext = this.body.util.toScreen(next);
    prevWidth = width;
    width = xNext - x;

    switch (step.scale) {
      case 'week':
        showMinorGrid = true;
        break;

      default:
        showMinorGrid = width >= prevWidth * 0.4;
        break;
      // prevent displaying of the 31th of the month on a scale of 5 days
    }

    if (this.options.showMinorLabels && showMinorGrid) {
      var label = this._repaintMinorText(x, step.getLabelMinor(current), orientation, className);

      label.style.width = width + 'px'; // set width to prevent overflow
    }

    if (isMajor && this.options.showMajorLabels) {
      if (x > 0) {
        if (xFirstMajorLabel == undefined) {
          xFirstMajorLabel = x;
        }

        label = this._repaintMajorText(x, step.getLabelMajor(current), orientation, className);
      }

      line = this._repaintMajorLine(x, width, orientation, className);
    } else {
      // minor line
      if (showMinorGrid) {
        line = this._repaintMinorLine(x, width, orientation, className);
      } else {
        if (line) {
          // adjust the width of the previous grid
          line.style.width = parseInt(line.style.width) + width + 'px';
        }
      }
    }
  }

  if (count === MAX && !warnedForOverflow) {
    console.warn("Something is wrong with the Timeline scale. Limited drawing of grid lines to ".concat(MAX, " lines."));
    warnedForOverflow = true;
  } // create a major label on the left when needed


  if (this.options.showMajorLabels) {
    var leftTime = this.body.util.toTime(0),
        leftText = step.getLabelMajor(leftTime),
        widthText = leftText.length * (this.props.majorCharWidth || 10) + 10; // upper bound estimation

    if (xFirstMajorLabel == undefined || widthText < xFirstMajorLabel) {
      this._repaintMajorText(0, leftText, orientation, className);
    }
  } // Cleanup leftover DOM elements from the redundant list


  util.forEach(this.dom.redundant, function (arr) {
    while (arr.length) {
      var elem = arr.pop();

      if (elem && elem.parentNode) {
        elem.parentNode.removeChild(elem);
      }
    }
  });
};
/**
 * Create a minor label for the axis at position x
 * @param {number} x
 * @param {string} text
 * @param {string} orientation   "top" or "bottom" (default)
 * @param {string} className
 * @return {Element} Returns the HTML element of the created label
 * @private
 */


TimeAxis.prototype._repaintMinorText = function (x, text, orientation, className) {
  // reuse redundant label
  var label = this.dom.redundant.minorTexts.shift();

  if (!label) {
    // create new label
    var content = document.createTextNode('');
    label = document.createElement('div');
    label.appendChild(content);
    this.dom.foreground.appendChild(label);
  }

  this.dom.minorTexts.push(label);
  label.innerHTML = text;
  label.style.top = orientation == 'top' ? this.props.majorLabelHeight + 'px' : '0';

  if (this.options.rtl) {
    label.style.left = "";
    label.style.right = x + 'px';
  } else {
    label.style.left = x + 'px';
  }

  label.className = 'vis-text vis-minor ' + className; //label.title = title;  // TODO: this is a heavy operation

  return label;
};
/**
 * Create a Major label for the axis at position x
 * @param {number} x
 * @param {string} text
 * @param {string} orientation   "top" or "bottom" (default)
 * @param {string} className
 * @return {Element} Returns the HTML element of the created label
 * @private
 */


TimeAxis.prototype._repaintMajorText = function (x, text, orientation, className) {
  // reuse redundant label
  var label = this.dom.redundant.majorTexts.shift();

  if (!label) {
    // create label
    var content = document.createElement('div');
    label = document.createElement('div');
    label.appendChild(content);
    this.dom.foreground.appendChild(label);
  }

  label.childNodes[0].innerHTML = text;
  label.className = 'vis-text vis-major ' + className; //label.title = title; // TODO: this is a heavy operation

  label.style.top = orientation == 'top' ? '0' : this.props.minorLabelHeight + 'px';

  if (this.options.rtl) {
    label.style.left = "";
    label.style.right = x + 'px';
  } else {
    label.style.left = x + 'px';
  }

  this.dom.majorTexts.push(label);
  return label;
};
/**
 * Create a minor line for the axis at position x
 * @param {number} x
 * @param {number} width
 * @param {string} orientation   "top" or "bottom" (default)
 * @param {string} className
 * @return {Element} Returns the created line
 * @private
 */


TimeAxis.prototype._repaintMinorLine = function (x, width, orientation, className) {
  // reuse redundant line
  var line = this.dom.redundant.lines.shift();

  if (!line) {
    // create vertical line
    line = document.createElement('div');
    this.dom.background.appendChild(line);
  }

  this.dom.lines.push(line);
  var props = this.props;

  if (orientation == 'top') {
    line.style.top = props.majorLabelHeight + 'px';
  } else {
    line.style.top = this.body.domProps.top.height + 'px';
  }

  line.style.height = props.minorLineHeight + 'px';

  if (this.options.rtl) {
    line.style.left = "";
    line.style.right = x - props.minorLineWidth / 2 + 'px';
    line.className = 'vis-grid vis-vertical-rtl vis-minor ' + className;
  } else {
    line.style.left = x - props.minorLineWidth / 2 + 'px';
    line.className = 'vis-grid vis-vertical vis-minor ' + className;
  }

  line.style.width = width + 'px';
  return line;
};
/**
 * Create a Major line for the axis at position x
 * @param {number} x
 * @param {number} width
 * @param {string} orientation   "top" or "bottom" (default)
 * @param {string} className
 * @return {Element} Returns the created line
 * @private
 */


TimeAxis.prototype._repaintMajorLine = function (x, width, orientation, className) {
  // reuse redundant line
  var line = this.dom.redundant.lines.shift();

  if (!line) {
    // create vertical line
    line = document.createElement('div');
    this.dom.background.appendChild(line);
  }

  this.dom.lines.push(line);
  var props = this.props;

  if (orientation == 'top') {
    line.style.top = '0';
  } else {
    line.style.top = this.body.domProps.top.height + 'px';
  }

  if (this.options.rtl) {
    line.style.left = "";
    line.style.right = x - props.majorLineWidth / 2 + 'px';
    line.className = 'vis-grid vis-vertical-rtl vis-major ' + className;
  } else {
    line.style.left = x - props.majorLineWidth / 2 + 'px';
    line.className = 'vis-grid vis-vertical vis-major ' + className;
  }

  line.style.height = props.majorLineHeight + 'px';
  line.style.width = width + 'px';
  return line;
};
/**
 * Determine the size of text on the axis (both major and minor axis).
 * The size is calculated only once and then cached in this.props.
 * @private
 */


TimeAxis.prototype._calculateCharSize = function () {
  // Note: We calculate char size with every redraw. Size may change, for
  // example when any of the timelines parents had display:none for example.
  // determine the char width and height on the minor axis
  if (!this.dom.measureCharMinor) {
    this.dom.measureCharMinor = document.createElement('DIV');
    this.dom.measureCharMinor.className = 'vis-text vis-minor vis-measure';
    this.dom.measureCharMinor.style.position = 'absolute';
    this.dom.measureCharMinor.appendChild(document.createTextNode('0'));
    this.dom.foreground.appendChild(this.dom.measureCharMinor);
  }

  this.props.minorCharHeight = this.dom.measureCharMinor.clientHeight;
  this.props.minorCharWidth = this.dom.measureCharMinor.clientWidth; // determine the char width and height on the major axis

  if (!this.dom.measureCharMajor) {
    this.dom.measureCharMajor = document.createElement('DIV');
    this.dom.measureCharMajor.className = 'vis-text vis-major vis-measure';
    this.dom.measureCharMajor.style.position = 'absolute';
    this.dom.measureCharMajor.appendChild(document.createTextNode('0'));
    this.dom.foreground.appendChild(this.dom.measureCharMajor);
  }

  this.props.majorCharHeight = this.dom.measureCharMajor.clientHeight;
  this.props.majorCharWidth = this.dom.measureCharMajor.clientWidth;
};

var warnedForOverflow = false;

var keycharm = createCommonjsModule$1(function (module, exports) {
  /**
   * Created by Alex on 11/6/2014.
   */
  // https://github.com/umdjs/umd/blob/master/returnExports.js#L40-L60
  // if the module has no dependencies, the above pattern can be simplified to

  (function (root, factory) {
    {
      // Node. Does not work with strict CommonJS, but
      // only CommonJS-like environments that support module.exports,
      // like Node.
      module.exports = factory();
    }
  })(commonjsGlobal$1, function () {
    function keycharm(options) {
      var preventDefault = options && options.preventDefault || false;
      var container = options && options.container || window;
      var _exportFunctions = {};
      var _bound = {
        keydown: {},
        keyup: {}
      };
      var _keys = {};
      var i; // a - z

      for (i = 97; i <= 122; i++) {
        _keys[String.fromCharCode(i)] = {
          code: 65 + (i - 97),
          shift: false
        };
      } // A - Z


      for (i = 65; i <= 90; i++) {
        _keys[String.fromCharCode(i)] = {
          code: i,
          shift: true
        };
      } // 0 - 9


      for (i = 0; i <= 9; i++) {
        _keys['' + i] = {
          code: 48 + i,
          shift: false
        };
      } // F1 - F12


      for (i = 1; i <= 12; i++) {
        _keys['F' + i] = {
          code: 111 + i,
          shift: false
        };
      } // num0 - num9


      for (i = 0; i <= 9; i++) {
        _keys['num' + i] = {
          code: 96 + i,
          shift: false
        };
      } // numpad misc


      _keys['num*'] = {
        code: 106,
        shift: false
      };
      _keys['num+'] = {
        code: 107,
        shift: false
      };
      _keys['num-'] = {
        code: 109,
        shift: false
      };
      _keys['num/'] = {
        code: 111,
        shift: false
      };
      _keys['num.'] = {
        code: 110,
        shift: false
      }; // arrows

      _keys['left'] = {
        code: 37,
        shift: false
      };
      _keys['up'] = {
        code: 38,
        shift: false
      };
      _keys['right'] = {
        code: 39,
        shift: false
      };
      _keys['down'] = {
        code: 40,
        shift: false
      }; // extra keys

      _keys['space'] = {
        code: 32,
        shift: false
      };
      _keys['enter'] = {
        code: 13,
        shift: false
      };
      _keys['shift'] = {
        code: 16,
        shift: undefined
      };
      _keys['esc'] = {
        code: 27,
        shift: false
      };
      _keys['backspace'] = {
        code: 8,
        shift: false
      };
      _keys['tab'] = {
        code: 9,
        shift: false
      };
      _keys['ctrl'] = {
        code: 17,
        shift: false
      };
      _keys['alt'] = {
        code: 18,
        shift: false
      };
      _keys['delete'] = {
        code: 46,
        shift: false
      };
      _keys['pageup'] = {
        code: 33,
        shift: false
      };
      _keys['pagedown'] = {
        code: 34,
        shift: false
      }; // symbols

      _keys['='] = {
        code: 187,
        shift: false
      };
      _keys['-'] = {
        code: 189,
        shift: false
      };
      _keys[']'] = {
        code: 221,
        shift: false
      };
      _keys['['] = {
        code: 219,
        shift: false
      };

      var down = function (event) {
        handleEvent(event, 'keydown');
      };

      var up = function (event) {
        handleEvent(event, 'keyup');
      }; // handle the actualy bound key with the event


      var handleEvent = function (event, type) {
        if (_bound[type][event.keyCode] !== undefined) {
          var bound = _bound[type][event.keyCode];

          for (var i = 0; i < bound.length; i++) {
            if (bound[i].shift === undefined) {
              bound[i].fn(event);
            } else if (bound[i].shift == true && event.shiftKey == true) {
              bound[i].fn(event);
            } else if (bound[i].shift == false && event.shiftKey == false) {
              bound[i].fn(event);
            }
          }

          if (preventDefault == true) {
            event.preventDefault();
          }
        }
      }; // bind a key to a callback


      _exportFunctions.bind = function (key, callback, type) {
        if (type === undefined) {
          type = 'keydown';
        }

        if (_keys[key] === undefined) {
          throw new Error("unsupported key: " + key);
        }

        if (_bound[type][_keys[key].code] === undefined) {
          _bound[type][_keys[key].code] = [];
        }

        _bound[type][_keys[key].code].push({
          fn: callback,
          shift: _keys[key].shift
        });
      }; // bind all keys to a call back (demo purposes)


      _exportFunctions.bindAll = function (callback, type) {
        if (type === undefined) {
          type = 'keydown';
        }

        for (var key in _keys) {
          if (_keys.hasOwnProperty(key)) {
            _exportFunctions.bind(key, callback, type);
          }
        }
      }; // get the key label from an event


      _exportFunctions.getKey = function (event) {
        for (var key in _keys) {
          if (_keys.hasOwnProperty(key)) {
            if (event.shiftKey == true && _keys[key].shift == true && event.keyCode == _keys[key].code) {
              return key;
            } else if (event.shiftKey == false && _keys[key].shift == false && event.keyCode == _keys[key].code) {
              return key;
            } else if (event.keyCode == _keys[key].code && key == 'shift') {
              return key;
            }
          }
        }

        return "unknown key, currently not supported";
      }; // unbind either a specific callback from a key or all of them (by leaving callback undefined)


      _exportFunctions.unbind = function (key, callback, type) {
        if (type === undefined) {
          type = 'keydown';
        }

        if (_keys[key] === undefined) {
          throw new Error("unsupported key: " + key);
        }

        if (callback !== undefined) {
          var newBindings = [];
          var bound = _bound[type][_keys[key].code];

          if (bound !== undefined) {
            for (var i = 0; i < bound.length; i++) {
              if (!(bound[i].fn == callback && bound[i].shift == _keys[key].shift)) {
                newBindings.push(_bound[type][_keys[key].code][i]);
              }
            }
          }

          _bound[type][_keys[key].code] = newBindings;
        } else {
          _bound[type][_keys[key].code] = [];
        }
      }; // reset all bound variables.


      _exportFunctions.reset = function () {
        _bound = {
          keydown: {},
          keyup: {}
        };
      }; // unbind all listeners and reset all variables.


      _exportFunctions.destroy = function () {
        _bound = {
          keydown: {},
          keyup: {}
        };
        container.removeEventListener('keydown', down, true);
        container.removeEventListener('keyup', up, true);
      }; // create listeners.


      container.addEventListener('keydown', down, true);
      container.addEventListener('keyup', up, true); // return the public functions.

      return _exportFunctions;
    }

    return keycharm;
  });
});

/**
 * Turn an element into an clickToUse element.
 * When not active, the element has a transparent overlay. When the overlay is
 * clicked, the mode is changed to active.
 * When active, the element is displayed with a blue border around it, and
 * the interactive contents of the element can be used. When clicked outside
 * the element, the elements mode is changed to inactive.
 * @param {Element} container
 * @constructor Activator
 */

function Activator(container) {
  this.active = false;
  this.dom = {
    container: container
  };
  this.dom.overlay = document.createElement('div');
  this.dom.overlay.className = 'vis-overlay';
  this.dom.container.appendChild(this.dom.overlay);
  this.hammer = hammer$1(this.dom.overlay);
  this.hammer.on('tap', this._onTapOverlay.bind(this)); // block all touch events (except tap)

  var me = this;
  var events = ['tap', 'doubletap', 'press', 'pinch', 'pan', 'panstart', 'panmove', 'panend'];
  events.forEach(function (event) {
    me.hammer.on(event, function (event) {
      event.stopPropagation();
    });
  }); // attach a click event to the window, in order to deactivate when clicking outside the timeline

  if (document && document.body) {
    this.onClick = function (event) {
      if (!_hasParent(event.target, container)) {
        me.deactivate();
      }
    };

    document.body.addEventListener('click', this.onClick);
  }

  if (this.keycharm !== undefined) {
    this.keycharm.destroy();
  }

  this.keycharm = keycharm(); // keycharm listener only bounded when active)

  this.escListener = this.deactivate.bind(this);
} // turn into an event emitter


emitterComponent(Activator.prototype); // The currently active activator

Activator.current = null;
/**
 * Destroy the activator. Cleans up all created DOM and event listeners
 */

Activator.prototype.destroy = function () {
  this.deactivate(); // remove dom

  this.dom.overlay.parentNode.removeChild(this.dom.overlay); // remove global event listener

  if (this.onClick) {
    document.body.removeEventListener('click', this.onClick);
  } // remove keycharm


  if (this.keycharm !== undefined) {
    this.keycharm.destroy();
  }

  this.keycharm = null; // cleanup hammer instances

  this.hammer.destroy();
  this.hammer = null; // FIXME: cleaning up hammer instances doesn't work (Timeline not removed from memory)
};
/**
 * Activate the element
 * Overlay is hidden, element is decorated with a blue shadow border
 */


Activator.prototype.activate = function () {
  // we allow only one active activator at a time
  if (Activator.current) {
    Activator.current.deactivate();
  }

  Activator.current = this;
  this.active = true;
  this.dom.overlay.style.display = 'none';
  util.addClassName(this.dom.container, 'vis-active');
  this.emit('change');
  this.emit('activate'); // ugly hack: bind ESC after emitting the events, as the Network rebinds all
  // keyboard events on a 'change' event

  this.keycharm.bind('esc', this.escListener);
};
/**
 * Deactivate the element
 * Overlay is displayed on top of the element
 */


Activator.prototype.deactivate = function () {
  this.active = false;
  this.dom.overlay.style.display = '';
  util.removeClassName(this.dom.container, 'vis-active');
  this.keycharm.unbind('esc', this.escListener);
  this.emit('change');
  this.emit('deactivate');
};
/**
 * Handle a tap event: activate the container
 * @param {Event}  event   The event
 * @private
 */


Activator.prototype._onTapOverlay = function (event) {
  // activate the container
  this.activate();
  event.stopPropagation();
};
/**
 * Test whether the element has the requested parent element somewhere in
 * its chain of parent nodes.
 * @param {HTMLElement} element
 * @param {HTMLElement} parent
 * @returns {boolean} Returns true when the parent is found somewhere in the
 *                    chain of parent nodes.
 * @private
 */


function _hasParent(element, parent) {
  while (element) {
    if (element === parent) {
      return true;
    }

    element = element.parentNode;
  }

  return false;
}

var locales = createCommonjsModule$1(function (module, exports) {
  // English
  exports['en'] = {
    current: 'current',
    time: 'time'
  };
  exports['en_EN'] = exports['en'];
  exports['en_US'] = exports['en']; // Italiano

  exports['it'] = {
    current: 'attuale',
    time: 'tempo'
  };
  exports['it_IT'] = exports['it'];
  exports['it_CH'] = exports['it']; // Dutch

  exports['nl'] = {
    current: 'huidige',
    time: 'tijd'
  };
  exports['nl_NL'] = exports['nl'];
  exports['nl_BE'] = exports['nl']; // German

  exports['de'] = {
    current: 'Aktuelle',
    time: 'Zeit'
  };
  exports['de_DE'] = exports['de']; // French

  exports['fr'] = {
    current: 'actuel',
    time: 'heure'
  };
  exports['fr_FR'] = exports['fr'];
  exports['fr_CA'] = exports['fr'];
  exports['fr_BE'] = exports['fr']; // Espanol

  exports['es'] = {
    current: 'corriente',
    time: 'hora'
  };
  exports['es_ES'] = exports['es']; // Ukrainian

  exports['uk'] = {
    current: 'поточний',
    time: 'час'
  };
  exports['uk_UA'] = exports['uk']; // Russian

  exports['ru'] = {
    current: 'текущее',
    time: 'время'
  };
  exports['ru_RU'] = exports['ru'];
});

/**
 * A custom time bar
 * @param {{range: Range, dom: Object}} body
 * @param {Object} [options]        Available parameters:
 *                                  {number | string} id
 *                                  {string} locales
 *                                  {string} locale
 * @constructor CustomTime
 * @extends Component
 */

function CustomTime(body, options) {
  this.body = body; // default options

  this.defaultOptions = {
    moment: moment$3,
    locales: locales,
    locale: 'en',
    id: undefined,
    title: undefined,
    editable: true
  };
  this.options = util.extend({}, this.defaultOptions);

  if (options && options.time) {
    this.customTime = options.time;
  } else {
    this.customTime = new Date();
  }

  this.eventParams = {}; // stores state parameters while dragging the bar

  this.setOptions(options); // create the DOM

  this._create();
}

CustomTime.prototype = new Component_1();
/**
 * Set options for the component. Options will be merged in current options.
 * @param {Object} options  Available parameters:
 *                                  {number | string} id
 *                                  {string} locales
 *                                  {string} locale
 */

CustomTime.prototype.setOptions = function (options) {
  if (options) {
    // copy all options that we know
    util.selectiveExtend(['moment', 'locale', 'locales', 'id', 'editable'], this.options, options);
  }
};
/**
 * Create the DOM for the custom time
 * @private
 */


CustomTime.prototype._create = function () {
  var bar = document.createElement('div');
  bar['custom-time'] = this;
  bar.className = 'vis-custom-time ' + (!this.options.editable ? 'disabled ' : '') + (this.options.id || '');
  bar.style.position = 'absolute';
  bar.style.top = '0px';
  bar.style.height = '100%';
  this.bar = bar;
  var drag = document.createElement('div');
  drag.style.position = 'relative';
  drag.style.top = '0px';
  drag.style.left = '-10px';
  drag.style.height = '100%';
  drag.style.width = '20px';
  /**
   *
   * @param {WheelEvent} e
   */

  function onMouseWheel(e) {
    this.body.range._onMouseWheel(e);
  }

  if (drag.addEventListener) {
    // IE9, Chrome, Safari, Opera
    drag.addEventListener("mousewheel", onMouseWheel.bind(this), false); // Firefox

    drag.addEventListener("DOMMouseScroll", onMouseWheel.bind(this), false);
  } else {
    // IE 6/7/8
    drag.attachEvent("onmousewheel", onMouseWheel.bind(this));
  }

  bar.appendChild(drag); // if bar is editable by the user, attach drag handlers

  if (this.options.editable) {
    // attach event listeners
    this.hammer = new hammer$1(drag);
    this.hammer.on('panstart', this._onDragStart.bind(this));
    this.hammer.on('panmove', this._onDrag.bind(this));
    this.hammer.on('panend', this._onDragEnd.bind(this));
    this.hammer.get('pan').set({
      threshold: 5,
      direction: hammer$1.DIRECTION_HORIZONTAL
    });
  }
};
/**
 * Destroy the CustomTime bar
 */


CustomTime.prototype.destroy = function () {
  this.hide();
  this.hammer.destroy();
  this.hammer = null;
  this.body = null;
};
/**
 * Repaint the component
 * @return {boolean} Returns true if the component is resized
 */


CustomTime.prototype.redraw = function () {
  var parent = this.body.dom.backgroundVertical;

  if (this.bar.parentNode != parent) {
    // attach to the dom
    if (this.bar.parentNode) {
      this.bar.parentNode.removeChild(this.bar);
    }

    parent.appendChild(this.bar);
  }

  var x = this.body.util.toScreen(this.customTime);
  var locale = this.options.locales[this.options.locale];

  if (!locale) {
    if (!this.warned) {
      console.log('WARNING: options.locales[\'' + this.options.locale + '\'] not found. See http://visjs.org/docs/timeline/#Localization');
      this.warned = true;
    }

    locale = this.options.locales['en']; // fall back on english when not available
  }

  var title = this.options.title; // To hide the title completely use empty string ''.

  if (title === undefined) {
    title = locale.time + ': ' + this.options.moment(this.customTime).format('dddd, MMMM Do YYYY, H:mm:ss');
    title = title.charAt(0).toUpperCase() + title.substring(1);
  } else if (typeof title === "function") {
    title = title.call(this.customTime);
  }

  this.bar.style.left = x + 'px';
  this.bar.title = title;
  return false;
};
/**
 * Remove the CustomTime from the DOM
 */


CustomTime.prototype.hide = function () {
  // remove the line from the DOM
  if (this.bar.parentNode) {
    this.bar.parentNode.removeChild(this.bar);
  }
};
/**
 * Set custom time.
 * @param {Date | number | string} time
 */


CustomTime.prototype.setCustomTime = function (time) {
  this.customTime = util.convert(time, 'Date');
  this.redraw();
};
/**
 * Retrieve the current custom time.
 * @return {Date} customTime
 */


CustomTime.prototype.getCustomTime = function () {
  return new Date(this.customTime.valueOf());
};
/**
  * Set custom title.
  * @param {Date | number | string} title
  */


CustomTime.prototype.setCustomTitle = function (title) {
  this.options.title = title;
};
/**
 * Start moving horizontally
 * @param {Event} event
 * @private
 */


CustomTime.prototype._onDragStart = function (event) {
  this.eventParams.dragging = true;
  this.eventParams.customTime = this.customTime;
  event.stopPropagation();
};
/**
 * Perform moving operating.
 * @param {Event} event
 * @private
 */


CustomTime.prototype._onDrag = function (event) {
  if (!this.eventParams.dragging) return;
  var x = this.body.util.toScreen(this.eventParams.customTime) + event.deltaX;
  var time = this.body.util.toTime(x);
  this.setCustomTime(time); // fire a timechange event

  this.body.emitter.emit('timechange', {
    id: this.options.id,
    time: new Date(this.customTime.valueOf()),
    event: event
  });
  event.stopPropagation();
};
/**
 * Stop moving operating.
 * @param {Event} event
 * @private
 */


CustomTime.prototype._onDragEnd = function (event) {
  if (!this.eventParams.dragging) return; // fire a timechanged event

  this.body.emitter.emit('timechanged', {
    id: this.options.id,
    time: new Date(this.customTime.valueOf()),
    event: event
  });
  event.stopPropagation();
};
/**
 * Find a custom time from an event target:
 * searches for the attribute 'custom-time' in the event target's element tree
 * @param {Event} event
 * @return {CustomTime | null} customTime
 */


CustomTime.customTimeFromTarget = function (event) {
  var target = event.target;

  while (target) {
    if (target.hasOwnProperty('custom-time')) {
      return target['custom-time'];
    }

    target = target.parentNode;
  }

  return null;
};

/**
 * Create a timeline visualization
 * @constructor Core
 */

function Core() {} // turn Core into an event emitter


emitterComponent(Core.prototype);
/**
 * Create the main DOM for the Core: a root panel containing left, right,
 * top, bottom, content, and background panel.
 * @param {Element} container  The container element where the Core will
 *                             be attached.
 * @protected
 */

Core.prototype._create = function (container) {
  this.dom = {};
  this.dom.container = container;
  this.dom.container.style.position = 'relative';
  this.dom.root = document.createElement('div');
  this.dom.background = document.createElement('div');
  this.dom.backgroundVertical = document.createElement('div');
  this.dom.backgroundHorizontal = document.createElement('div');
  this.dom.centerContainer = document.createElement('div');
  this.dom.leftContainer = document.createElement('div');
  this.dom.rightContainer = document.createElement('div');
  this.dom.center = document.createElement('div');
  this.dom.left = document.createElement('div');
  this.dom.right = document.createElement('div');
  this.dom.top = document.createElement('div');
  this.dom.bottom = document.createElement('div');
  this.dom.shadowTop = document.createElement('div');
  this.dom.shadowBottom = document.createElement('div');
  this.dom.shadowTopLeft = document.createElement('div');
  this.dom.shadowBottomLeft = document.createElement('div');
  this.dom.shadowTopRight = document.createElement('div');
  this.dom.shadowBottomRight = document.createElement('div');
  this.dom.rollingModeBtn = document.createElement('div');
  this.dom.loadingScreen = document.createElement('div');
  this.dom.root.className = 'vis-timeline';
  this.dom.background.className = 'vis-panel vis-background';
  this.dom.backgroundVertical.className = 'vis-panel vis-background vis-vertical';
  this.dom.backgroundHorizontal.className = 'vis-panel vis-background vis-horizontal';
  this.dom.centerContainer.className = 'vis-panel vis-center';
  this.dom.leftContainer.className = 'vis-panel vis-left';
  this.dom.rightContainer.className = 'vis-panel vis-right';
  this.dom.top.className = 'vis-panel vis-top';
  this.dom.bottom.className = 'vis-panel vis-bottom';
  this.dom.left.className = 'vis-content';
  this.dom.center.className = 'vis-content';
  this.dom.right.className = 'vis-content';
  this.dom.shadowTop.className = 'vis-shadow vis-top';
  this.dom.shadowBottom.className = 'vis-shadow vis-bottom';
  this.dom.shadowTopLeft.className = 'vis-shadow vis-top';
  this.dom.shadowBottomLeft.className = 'vis-shadow vis-bottom';
  this.dom.shadowTopRight.className = 'vis-shadow vis-top';
  this.dom.shadowBottomRight.className = 'vis-shadow vis-bottom';
  this.dom.rollingModeBtn.className = 'vis-rolling-mode-btn';
  this.dom.loadingScreen.className = 'vis-loading-screen';
  this.dom.root.appendChild(this.dom.background);
  this.dom.root.appendChild(this.dom.backgroundVertical);
  this.dom.root.appendChild(this.dom.backgroundHorizontal);
  this.dom.root.appendChild(this.dom.centerContainer);
  this.dom.root.appendChild(this.dom.leftContainer);
  this.dom.root.appendChild(this.dom.rightContainer);
  this.dom.root.appendChild(this.dom.top);
  this.dom.root.appendChild(this.dom.bottom);
  this.dom.root.appendChild(this.dom.rollingModeBtn);
  this.dom.centerContainer.appendChild(this.dom.center);
  this.dom.leftContainer.appendChild(this.dom.left);
  this.dom.rightContainer.appendChild(this.dom.right);
  this.dom.centerContainer.appendChild(this.dom.shadowTop);
  this.dom.centerContainer.appendChild(this.dom.shadowBottom);
  this.dom.leftContainer.appendChild(this.dom.shadowTopLeft);
  this.dom.leftContainer.appendChild(this.dom.shadowBottomLeft);
  this.dom.rightContainer.appendChild(this.dom.shadowTopRight);
  this.dom.rightContainer.appendChild(this.dom.shadowBottomRight); // size properties of each of the panels

  this.props = {
    root: {},
    background: {},
    centerContainer: {},
    leftContainer: {},
    rightContainer: {},
    center: {},
    left: {},
    right: {},
    top: {},
    bottom: {},
    border: {},
    scrollTop: 0,
    scrollTopMin: 0
  };
  this.on('rangechange', function () {
    if (this.initialDrawDone === true) {
      this._redraw();
    }
  }.bind(this));
  this.on('rangechanged', function () {
    if (!this.initialRangeChangeDone) {
      this.initialRangeChangeDone = true;
    }
  }.bind(this));
  this.on('touch', this._onTouch.bind(this));
  this.on('panmove', this._onDrag.bind(this));
  var me = this;
  this._origRedraw = this._redraw.bind(this);
  this._redraw = util.throttle(this._origRedraw);
  this.on('_change', function (properties) {
    if (me.itemSet && me.itemSet.initialItemSetDrawn && properties && properties.queue == true) {
      me._redraw();
    } else {
      me._origRedraw();
    }
  }); // create event listeners for all interesting events, these events will be
  // emitted via emitter

  this.hammer = new hammer$1(this.dom.root);
  var pinchRecognizer = this.hammer.get('pinch').set({
    enable: true
  });
  pinchRecognizer && hammerUtil.disablePreventDefaultVertically(pinchRecognizer);
  this.hammer.get('pan').set({
    threshold: 5,
    direction: hammer$1.DIRECTION_HORIZONTAL
  });
  this.listeners = {};
  var events = ['tap', 'doubletap', 'press', 'pinch', 'pan', 'panstart', 'panmove', 'panend' // TODO: cleanup
  //'touch', 'pinch',
  //'tap', 'doubletap', 'hold',
  //'dragstart', 'drag', 'dragend',
  //'mousewheel', 'DOMMouseScroll' // DOMMouseScroll is needed for Firefox
  ];
  events.forEach(function (type) {
    var listener = function listener(event) {
      if (me.isActive()) {
        me.emit(type, event);
      }
    };

    me.hammer.on(type, listener);
    me.listeners[type] = listener;
  }); // emulate a touch event (emitted before the start of a pan, pinch, tap, or press)

  hammerUtil.onTouch(this.hammer, function (event) {
    me.emit('touch', event);
  }.bind(this)); // emulate a release event (emitted after a pan, pinch, tap, or press)

  hammerUtil.onRelease(this.hammer, function (event) {
    me.emit('release', event);
  }.bind(this));
  /**
   *
   * @param {WheelEvent} event
   */

  function onMouseWheel(event) {
    // Reasonable default wheel deltas
    var LINE_HEIGHT = 40;
    var PAGE_HEIGHT = 800;

    if (this.isActive()) {
      this.emit('mousewheel', event);
    } // deltaX and deltaY normalization from jquery.mousewheel.js


    var deltaX = 0;
    var deltaY = 0; // Old school scrollwheel delta

    if ('detail' in event) {
      deltaY = event.detail * -1;
    }

    if ('wheelDelta' in event) {
      deltaY = event.wheelDelta;
    }

    if ('wheelDeltaY' in event) {
      deltaY = event.wheelDeltaY;
    }

    if ('wheelDeltaX' in event) {
      deltaX = event.wheelDeltaX * -1;
    } // Firefox < 17 horizontal scrolling related to DOMMouseScroll event


    if ('axis' in event && event.axis === event.HORIZONTAL_AXIS) {
      deltaX = deltaY * -1;
      deltaY = 0;
    } // New school wheel delta (wheel event)


    if ('deltaY' in event) {
      deltaY = event.deltaY * -1;
    }

    if ('deltaX' in event) {
      deltaX = event.deltaX;
    } // Normalize deltas


    if (event.deltaMode) {
      if (event.deltaMode === 1) {
        // delta in LINE units
        deltaX *= LINE_HEIGHT;
        deltaY *= LINE_HEIGHT;
      } else {
        // delta in PAGE units
        deltaX *= LINE_HEIGHT;
        deltaY *= PAGE_HEIGHT;
      }
    } // Prevent scrolling when zooming (no zoom key, or pressing zoom key)


    if (!this.options.zoomKey || event[this.options.zoomKey]) return; // Don't preventDefault if you can't scroll

    if (!this.options.verticalScroll && !this.options.horizontalScroll) return; // Prevent default actions caused by mouse wheel
    // (else the page and timeline both scroll)

    event.preventDefault();

    if (this.options.verticalScroll && Math.abs(deltaY) >= Math.abs(deltaX)) {
      var current = this.props.scrollTop;
      var adjusted = current + deltaY;

      if (this.isActive()) {
        this._setScrollTop(adjusted);

        this._redraw();

        this.emit('scroll', event);
      }
    } else if (this.options.horizontalScroll) {
      var delta = Math.abs(deltaX) >= Math.abs(deltaY) ? deltaX : deltaY; // calculate a single scroll jump relative to the range scale

      var diff = delta / 120 * (this.range.end - this.range.start) / 20; // calculate new start and end

      var newStart = this.range.start + diff;
      var newEnd = this.range.end + diff;
      var options = {
        animation: false,
        byUser: true,
        event: event
      };
      this.range.setRange(newStart, newEnd, options);
    }
  } // Add modern wheel event listener


  if (this.dom.centerContainer.addEventListener) {
    var wheel = "onwheel" in document.createElement("div") ? "wheel" : // Modern browsers support "wheel"
    document.onmousewheel !== undefined ? "mousewheel" : // Webkit and IE support at least "mousewheel"
    "DOMMouseScroll"; // Older Firefox versions like "DOMMouseScroll"

    this.dom.centerContainer.addEventListener(wheel, onMouseWheel.bind(this), false);
  } else {
    // IE 6/7/8
    this.dom.centerContainer.attachEvent("onmousewheel", onMouseWheel.bind(this));
  }
  /**
   *
   * @param {scroll} event
   */


  function onMouseScrollSide(event) {
    if (!me.options.verticalScroll) return;
    event.preventDefault();

    if (me.isActive()) {
      var adjusted = -event.target.scrollTop;

      me._setScrollTop(adjusted);

      me._redraw();

      me.emit('scrollSide', event);
    }
  }

  this.dom.left.parentNode.addEventListener('scroll', onMouseScrollSide.bind(this));
  this.dom.right.parentNode.addEventListener('scroll', onMouseScrollSide.bind(this));
  var itemAddedToTimeline = false;
  /**
   *
   * @param {dragover} event
   * @returns {boolean}
   */

  function handleDragOver(event) {
    if (event.preventDefault) {
      event.preventDefault(); // Necessary. Allows us to drop.
    } // make sure your target is a vis element


    if (!event.target.className.indexOf("vis") > -1) return; // make sure only one item is added every time you're over the timeline

    if (itemAddedToTimeline) return;
    event.dataTransfer.dropEffect = 'move';
    itemAddedToTimeline = true;
    return false;
  }
  /**
   *
   * @param {drop} event
   * @returns {boolean}
   */


  function handleDrop(event) {
    // prevent redirect to blank page - Firefox
    if (event.preventDefault) {
      event.preventDefault();
    }

    if (event.stopPropagation) {
      event.stopPropagation();
    } // return when dropping non-vis items


    try {
      var itemData = JSON.parse(event.dataTransfer.getData("text"));
      if (!itemData || !itemData.content) return;
    } catch (err) {
      return false;
    }

    itemAddedToTimeline = false;
    event.center = {
      x: event.clientX,
      y: event.clientY
    };

    if (itemData.target !== 'item') {
      me.itemSet._onAddItem(event);
    } else {
      me.itemSet._onDropObjectOnItem(event);
    }

    me.emit('drop', me.getEventProperties(event));
    return false;
  }

  this.dom.center.addEventListener('dragover', handleDragOver.bind(this), false);
  this.dom.center.addEventListener('drop', handleDrop.bind(this), false);
  this.customTimes = []; // store state information needed for touch events

  this.touch = {};
  this.redrawCount = 0;
  this.initialDrawDone = false;
  this.initialRangeChangeDone = false; // attach the root panel to the provided container

  if (!container) throw new Error('No container provided');
  container.appendChild(this.dom.root);
  container.appendChild(this.dom.loadingScreen);
};
/**
 * Set options. Options will be passed to all components loaded in the Timeline.
 * @param {Object} [options]
 *                           {String} orientation
 *                              Vertical orientation for the Timeline,
 *                              can be 'bottom' (default) or 'top'.
 *                           {string | number} width
 *                              Width for the timeline, a number in pixels or
 *                              a css string like '1000px' or '75%'. '100%' by default.
 *                           {string | number} height
 *                              Fixed height for the Timeline, a number in pixels or
 *                              a css string like '400px' or '75%'. If undefined,
 *                              The Timeline will automatically size such that
 *                              its contents fit.
 *                           {string | number} minHeight
 *                              Minimum height for the Timeline, a number in pixels or
 *                              a css string like '400px' or '75%'.
 *                           {string | number} maxHeight
 *                              Maximum height for the Timeline, a number in pixels or
 *                              a css string like '400px' or '75%'.
 *                           {number | Date | string} start
 *                              Start date for the visible window
 *                           {number | Date | string} end
 *                              End date for the visible window
 */


Core.prototype.setOptions = function (options) {
  if (options) {
    // copy the known options
    var fields = ['width', 'height', 'minHeight', 'maxHeight', 'autoResize', 'start', 'end', 'clickToUse', 'dataAttributes', 'hiddenDates', 'locale', 'locales', 'moment', 'rtl', 'zoomKey', 'horizontalScroll', 'verticalScroll'];
    util.selectiveExtend(fields, this.options, options);
    this.dom.rollingModeBtn.style.visibility = 'hidden';

    if (this.options.rtl) {
      this.dom.container.style.direction = "rtl";
      this.dom.backgroundVertical.className = 'vis-panel vis-background vis-vertical-rtl';
    }

    if (this.options.verticalScroll) {
      if (this.options.rtl) {
        this.dom.rightContainer.className = 'vis-panel vis-right vis-vertical-scroll';
      } else {
        this.dom.leftContainer.className = 'vis-panel vis-left vis-vertical-scroll';
      }
    }

    if (_typeof$1(this.options.orientation) !== 'object') {
      this.options.orientation = {
        item: undefined,
        axis: undefined
      };
    }

    if ('orientation' in options) {
      if (typeof options.orientation === 'string') {
        this.options.orientation = {
          item: options.orientation,
          axis: options.orientation
        };
      } else if (_typeof$1(options.orientation) === 'object') {
        if ('item' in options.orientation) {
          this.options.orientation.item = options.orientation.item;
        }

        if ('axis' in options.orientation) {
          this.options.orientation.axis = options.orientation.axis;
        }
      }
    }

    if (this.options.orientation.axis === 'both') {
      if (!this.timeAxis2) {
        var timeAxis2 = this.timeAxis2 = new TimeAxis(this.body);

        timeAxis2.setOptions = function (options) {
          var _options = options ? util.extend({}, options) : {};

          _options.orientation = 'top'; // override the orientation option, always top

          TimeAxis.prototype.setOptions.call(timeAxis2, _options);
        };

        this.components.push(timeAxis2);
      }
    } else {
      if (this.timeAxis2) {
        var index = this.components.indexOf(this.timeAxis2);

        if (index !== -1) {
          this.components.splice(index, 1);
        }

        this.timeAxis2.destroy();
        this.timeAxis2 = null;
      }
    } // if the graph2d's drawPoints is a function delegate the callback to the onRender property


    if (typeof options.drawPoints == 'function') {
      options.drawPoints = {
        onRender: options.drawPoints
      };
    }

    if ('hiddenDates' in this.options) {
      DateUtil.convertHiddenOptions(this.options.moment, this.body, this.options.hiddenDates);
    }

    if ('clickToUse' in options) {
      if (options.clickToUse) {
        if (!this.activator) {
          this.activator = new Activator(this.dom.root);
        }
      } else {
        if (this.activator) {
          this.activator.destroy();
          delete this.activator;
        }
      }
    }

    if ('showCustomTime' in options) {
      throw new Error('Option `showCustomTime` is deprecated. Create a custom time bar via timeline.addCustomTime(time [, id])');
    } // enable/disable autoResize


    this._initAutoResize();
  } // propagate options to all components


  this.components.forEach(function (component) {
    return component.setOptions(options);
  }); // enable/disable configure

  if ('configure' in options) {
    if (!this.configurator) {
      this.configurator = this._createConfigurator();
    }

    this.configurator.setOptions(options.configure); // collect the settings of all components, and pass them to the configuration system

    var appliedOptions = util.deepExtend({}, this.options);
    this.components.forEach(function (component) {
      util.deepExtend(appliedOptions, component.options);
    });
    this.configurator.setModuleOptions({
      global: appliedOptions
    });
  }

  this._redraw();
};
/**
 * Returns true when the Timeline is active.
 * @returns {boolean}
 */


Core.prototype.isActive = function () {
  return !this.activator || this.activator.active;
};
/**
 * Destroy the Core, clean up all DOM elements and event listeners.
 */


Core.prototype.destroy = function () {
  // unbind datasets
  this.setItems(null);
  this.setGroups(null); // remove all event listeners

  this.off(); // stop checking for changed size

  this._stopAutoResize(); // remove from DOM


  if (this.dom.root.parentNode) {
    this.dom.root.parentNode.removeChild(this.dom.root);
  }

  this.dom = null; // remove Activator

  if (this.activator) {
    this.activator.destroy();
    delete this.activator;
  } // cleanup hammer touch events


  for (var event in this.listeners) {
    if (this.listeners.hasOwnProperty(event)) {
      delete this.listeners[event];
    }
  }

  this.listeners = null;
  this.hammer && this.hammer.destroy();
  this.hammer = null; // give all components the opportunity to cleanup

  this.components.forEach(function (component) {
    return component.destroy();
  });
  this.body = null;
};
/**
 * Set a custom time bar
 * @param {Date} time
 * @param {number} [id=undefined] Optional id of the custom time bar to be adjusted.
 */


Core.prototype.setCustomTime = function (time, id) {
  var customTimes = this.customTimes.filter(function (component) {
    return id === component.options.id;
  });

  if (customTimes.length === 0) {
    throw new Error('No custom time bar found with id ' + JSON.stringify(id));
  }

  if (customTimes.length > 0) {
    customTimes[0].setCustomTime(time);
  }
};
/**
 * Retrieve the current custom time.
 * @param {number} [id=undefined]    Id of the custom time bar.
 * @return {Date | undefined} customTime
 */


Core.prototype.getCustomTime = function (id) {
  var customTimes = this.customTimes.filter(function (component) {
    return component.options.id === id;
  });

  if (customTimes.length === 0) {
    throw new Error('No custom time bar found with id ' + JSON.stringify(id));
  }

  return customTimes[0].getCustomTime();
};
/**
 * Set a custom title for the custom time bar.
 * @param {string} [title] Custom title
 * @param {number} [id=undefined]    Id of the custom time bar.
 * @returns {*}
 */


Core.prototype.setCustomTimeTitle = function (title, id) {
  var customTimes = this.customTimes.filter(function (component) {
    return component.options.id === id;
  });

  if (customTimes.length === 0) {
    throw new Error('No custom time bar found with id ' + JSON.stringify(id));
  }

  if (customTimes.length > 0) {
    return customTimes[0].setCustomTitle(title);
  }
};
/**
 * Retrieve meta information from an event.
 * Should be overridden by classes extending Core
 * @param {Event} event
 * @return {Object} An object with related information.
 */


Core.prototype.getEventProperties = function (event) {
  return {
    event: event
  };
};
/**
 * Add custom vertical bar
 * @param {Date | string | number} [time]  A Date, unix timestamp, or
 *                                         ISO date string. Time point where
 *                                         the new bar should be placed.
 *                                         If not provided, `new Date()` will
 *                                         be used.
 * @param {number | string} [id=undefined] Id of the new bar. Optional
 * @param {object} [options={}]            Control options for the new bar. Supported
 *                                         optoins are:
 *                                         editable {true, false} determines whether the 
 *                                         bar can be dragged by the user. Default is true.
 * @return {number | string}               Returns the id of the new bar
 */


Core.prototype.addCustomTime = function (time, id, options) {
  var timestamp = time !== undefined ? util.convert(time, 'Date').valueOf() : new Date();
  var exists = this.customTimes.some(function (customTime) {
    return customTime.options.id === id;
  });

  if (exists) {
    throw new Error('A custom time with id ' + JSON.stringify(id) + ' already exists');
  }

  var customTime = new CustomTime(this.body, util.extend({}, this.options, options, {
    time: timestamp,
    id: id
  }));
  this.customTimes.push(customTime);
  this.components.push(customTime);

  this._redraw();

  return id;
};
/**
 * Remove previously added custom bar
 * @param {int} id ID of the custom bar to be removed
 * [at]returns {boolean} True if the bar exists and is removed, false otherwise
 */


Core.prototype.removeCustomTime = function (id) {
  var customTimes = this.customTimes.filter(function (bar) {
    return bar.options.id === id;
  });

  if (customTimes.length === 0) {
    throw new Error('No custom time bar found with id ' + JSON.stringify(id));
  }

  customTimes.forEach(function (customTime) {
    this.customTimes.splice(this.customTimes.indexOf(customTime), 1);
    this.components.splice(this.components.indexOf(customTime), 1);
    customTime.destroy();
  }.bind(this));
};
/**
 * Get the id's of the currently visible items.
 * @returns {Array} The ids of the visible items
 */


Core.prototype.getVisibleItems = function () {
  return this.itemSet && this.itemSet.getVisibleItems() || [];
};
/**
 * Get the id's of the currently visible groups.
 * @returns {Array} The ids of the visible groups
 */


Core.prototype.getVisibleGroups = function () {
  return this.itemSet && this.itemSet.getVisibleGroups() || [];
};
/**
 * Set Core window such that it fits all items
 * @param {Object} [options]  Available options:
 *                                `animation: boolean | {duration: number, easingFunction: string}`
 *                                    If true (default), the range is animated
 *                                    smoothly to the new window. An object can be
 *                                    provided to specify duration and easing function.
 *                                    Default duration is 500 ms, and default easing
 *                                    function is 'easeInOutQuad'.
 * @param {function} [callback] a callback funtion to be executed at the end of this function
 */


Core.prototype.fit = function (options, callback) {
  var range = this.getDataRange(); // skip range set if there is no min and max date

  if (range.min === null && range.max === null) {
    return;
  } // apply a margin of 1% left and right of the data


  var interval = range.max - range.min;
  var min = new Date(range.min.valueOf() - interval * 0.01);
  var max = new Date(range.max.valueOf() + interval * 0.01);
  var animation = options && options.animation !== undefined ? options.animation : true;
  this.range.setRange(min, max, {
    animation: animation
  }, callback);
};
/**
 * Calculate the data range of the items start and end dates
 * [at]returns {{min: [Date], max: [Date]}}
 * @protected
 */


Core.prototype.getDataRange = function () {
  // must be implemented by Timeline and Graph2d
  throw new Error('Cannot invoke abstract method getDataRange');
};
/**
 * Set the visible window. Both parameters are optional, you can change only
 * start or only end. Syntax:
 *
 *     TimeLine.setWindow(start, end)
 *     TimeLine.setWindow(start, end, options)
 *     TimeLine.setWindow(range)
 *
 * Where start and end can be a Date, number, or string, and range is an
 * object with properties start and end.
 *
 * @param {Date | number | string | Object} [start] Start date of visible window
 * @param {Date | number | string} [end]            End date of visible window
 * @param {Object} [options]  Available options:
 *                                `animation: boolean | {duration: number, easingFunction: string}`
 *                                    If true (default), the range is animated
 *                                    smoothly to the new window. An object can be
 *                                    provided to specify duration and easing function.
 *                                    Default duration is 500 ms, and default easing
 *                                    function is 'easeInOutQuad'.
 * @param {function} [callback] a callback funtion to be executed at the end of this function
 */


Core.prototype.setWindow = function (start, end, options, callback) {
  if (typeof arguments[2] == "function") {
    callback = arguments[2];
    options = {};
  }

  var animation;
  var range;

  if (arguments.length == 1) {
    range = arguments[0];
    animation = range.animation !== undefined ? range.animation : true;
    this.range.setRange(range.start, range.end, {
      animation: animation
    });
  } else if (arguments.length == 2 && typeof arguments[1] == "function") {
    range = arguments[0];
    callback = arguments[1];
    animation = range.animation !== undefined ? range.animation : true;
    this.range.setRange(range.start, range.end, {
      animation: animation
    }, callback);
  } else {
    animation = options && options.animation !== undefined ? options.animation : true;
    this.range.setRange(start, end, {
      animation: animation
    }, callback);
  }
};
/**
 * Move the window such that given time is centered on screen.
 * @param {Date | number | string} time
 * @param {Object} [options]  Available options:
 *                                `animation: boolean | {duration: number, easingFunction: string}`
 *                                    If true (default), the range is animated
 *                                    smoothly to the new window. An object can be
 *                                    provided to specify duration and easing function.
 *                                    Default duration is 500 ms, and default easing
 *                                    function is 'easeInOutQuad'.
 * @param {function} [callback] a callback funtion to be executed at the end of this function
 */


Core.prototype.moveTo = function (time, options, callback) {
  if (typeof arguments[1] == "function") {
    callback = arguments[1];
    options = {};
  }

  var interval = this.range.end - this.range.start;
  var t = util.convert(time, 'Date').valueOf();
  var start = t - interval / 2;
  var end = t + interval / 2;
  var animation = options && options.animation !== undefined ? options.animation : true;
  this.range.setRange(start, end, {
    animation: animation
  }, callback);
};
/**
 * Get the visible window
 * @return {{start: Date, end: Date}}   Visible range
 */


Core.prototype.getWindow = function () {
  var range = this.range.getRange();
  return {
    start: new Date(range.start),
    end: new Date(range.end)
  };
};
/**
 * Zoom in the window such that given time is centered on screen.
 * @param {number} percentage - must be between [0..1]
 * @param {Object} [options]  Available options:
 *                                `animation: boolean | {duration: number, easingFunction: string}`
 *                                    If true (default), the range is animated
 *                                    smoothly to the new window. An object can be
 *                                    provided to specify duration and easing function.
 *                                    Default duration is 500 ms, and default easing
 *                                    function is 'easeInOutQuad'.
 * @param {function} [callback] a callback funtion to be executed at the end of this function
 */


Core.prototype.zoomIn = function (percentage, options, callback) {
  if (!percentage || percentage < 0 || percentage > 1) return;

  if (typeof arguments[1] == "function") {
    callback = arguments[1];
    options = {};
  }

  var range = this.getWindow();
  var start = range.start.valueOf();
  var end = range.end.valueOf();
  var interval = end - start;
  var newInterval = interval / (1 + percentage);
  var distance = (interval - newInterval) / 2;
  var newStart = start + distance;
  var newEnd = end - distance;
  this.setWindow(newStart, newEnd, options, callback);
};
/**
 * Zoom out the window such that given time is centered on screen.
 * @param {number} percentage - must be between [0..1]
 * @param {Object} [options]  Available options:
 *                                `animation: boolean | {duration: number, easingFunction: string}`
 *                                    If true (default), the range is animated
 *                                    smoothly to the new window. An object can be
 *                                    provided to specify duration and easing function.
 *                                    Default duration is 500 ms, and default easing
 *                                    function is 'easeInOutQuad'.
 * @param {function} [callback] a callback funtion to be executed at the end of this function
 */


Core.prototype.zoomOut = function (percentage, options, callback) {
  if (!percentage || percentage < 0 || percentage > 1) return;

  if (typeof arguments[1] == "function") {
    callback = arguments[1];
    options = {};
  }

  var range = this.getWindow();
  var start = range.start.valueOf();
  var end = range.end.valueOf();
  var interval = end - start;
  var newStart = start - interval * percentage / 2;
  var newEnd = end + interval * percentage / 2;
  this.setWindow(newStart, newEnd, options, callback);
};
/**
 * Force a redraw. Can be overridden by implementations of Core
 *
 * Note: this function will be overridden on construction with a trottled version
 */


Core.prototype.redraw = function () {
  this._redraw();
};
/**
 * Redraw for internal use. Redraws all components. See also the public
 * method redraw.
 * @protected
 */


Core.prototype._redraw = function () {
  this.redrawCount++;
  var resized = false;
  var options = this.options;
  var props = this.props;
  var dom = this.dom;
  if (!dom || !dom.container || dom.root.offsetWidth == 0) return; // when destroyed, or invisible

  DateUtil.updateHiddenDates(this.options.moment, this.body, this.options.hiddenDates); // update class names

  if (options.orientation == 'top') {
    util.addClassName(dom.root, 'vis-top');
    util.removeClassName(dom.root, 'vis-bottom');
  } else {
    util.removeClassName(dom.root, 'vis-top');
    util.addClassName(dom.root, 'vis-bottom');
  } // update root width and height options


  dom.root.style.maxHeight = util.option.asSize(options.maxHeight, '');
  dom.root.style.minHeight = util.option.asSize(options.minHeight, '');
  dom.root.style.width = util.option.asSize(options.width, ''); // calculate border widths

  props.border.left = (dom.centerContainer.offsetWidth - dom.centerContainer.clientWidth) / 2;
  props.border.right = props.border.left;
  props.border.top = (dom.centerContainer.offsetHeight - dom.centerContainer.clientHeight) / 2;
  props.border.bottom = props.border.top;
  props.borderRootHeight = dom.root.offsetHeight - dom.root.clientHeight;
  props.borderRootWidth = dom.root.offsetWidth - dom.root.clientWidth; // workaround for a bug in IE: the clientWidth of an element with
  // a height:0px and overflow:hidden is not calculated and always has value 0

  if (dom.centerContainer.clientHeight === 0) {
    props.border.left = props.border.top;
    props.border.right = props.border.left;
  }

  if (dom.root.clientHeight === 0) {
    props.borderRootWidth = props.borderRootHeight;
  } // calculate the heights. If any of the side panels is empty, we set the height to
  // minus the border width, such that the border will be invisible


  props.center.height = dom.center.offsetHeight;
  props.left.height = dom.left.offsetHeight;
  props.right.height = dom.right.offsetHeight;
  props.top.height = dom.top.clientHeight || -props.border.top;
  props.bottom.height = dom.bottom.clientHeight || -props.border.bottom; // TODO: compensate borders when any of the panels is empty.
  // apply auto height
  // TODO: only calculate autoHeight when needed (else we cause an extra reflow/repaint of the DOM)

  var contentHeight = Math.max(props.left.height, props.center.height, props.right.height);
  var autoHeight = props.top.height + contentHeight + props.bottom.height + props.borderRootHeight + props.border.top + props.border.bottom;
  dom.root.style.height = util.option.asSize(options.height, autoHeight + 'px'); // calculate heights of the content panels

  props.root.height = dom.root.offsetHeight;
  props.background.height = props.root.height - props.borderRootHeight;
  var containerHeight = props.root.height - props.top.height - props.bottom.height - props.borderRootHeight;
  props.centerContainer.height = containerHeight;
  props.leftContainer.height = containerHeight;
  props.rightContainer.height = props.leftContainer.height; // calculate the widths of the panels

  props.root.width = dom.root.offsetWidth;
  props.background.width = props.root.width - props.borderRootWidth;

  if (!this.initialDrawDone) {
    props.scrollbarWidth = util.getScrollBarWidth();
  }

  if (options.verticalScroll) {
    if (options.rtl) {
      props.left.width = dom.leftContainer.clientWidth || -props.border.left;
      props.right.width = dom.rightContainer.clientWidth + props.scrollbarWidth || -props.border.right;
    } else {
      props.left.width = dom.leftContainer.clientWidth + props.scrollbarWidth || -props.border.left;
      props.right.width = dom.rightContainer.clientWidth || -props.border.right;
    }
  } else {
    props.left.width = dom.leftContainer.clientWidth || -props.border.left;
    props.right.width = dom.rightContainer.clientWidth || -props.border.right;
  }

  this._setDOM(); // update the scrollTop, feasible range for the offset can be changed
  // when the height of the Core or of the contents of the center changed


  var offset = this._updateScrollTop(); // reposition the scrollable contents


  if (options.orientation.item != 'top') {
    offset += Math.max(props.centerContainer.height - props.center.height - props.border.top - props.border.bottom, 0);
  }

  dom.center.style.top = offset + 'px'; // show shadows when vertical scrolling is available

  var visibilityTop = props.scrollTop == 0 ? 'hidden' : '';
  var visibilityBottom = props.scrollTop == props.scrollTopMin ? 'hidden' : '';
  dom.shadowTop.style.visibility = visibilityTop;
  dom.shadowBottom.style.visibility = visibilityBottom;
  dom.shadowTopLeft.style.visibility = visibilityTop;
  dom.shadowBottomLeft.style.visibility = visibilityBottom;
  dom.shadowTopRight.style.visibility = visibilityTop;
  dom.shadowBottomRight.style.visibility = visibilityBottom;

  if (options.verticalScroll) {
    dom.rightContainer.className = 'vis-panel vis-right vis-vertical-scroll';
    dom.leftContainer.className = 'vis-panel vis-left vis-vertical-scroll';
    dom.shadowTopRight.style.visibility = "hidden";
    dom.shadowBottomRight.style.visibility = "hidden";
    dom.shadowTopLeft.style.visibility = "hidden";
    dom.shadowBottomLeft.style.visibility = "hidden";
    dom.left.style.top = '0px';
    dom.right.style.top = '0px';
  }

  if (!options.verticalScroll || props.center.height < props.centerContainer.height) {
    dom.left.style.top = offset + 'px';
    dom.right.style.top = offset + 'px';
    dom.rightContainer.className = dom.rightContainer.className.replace(new RegExp('(?:^|\\s)' + 'vis-vertical-scroll' + '(?:\\s|$)'), ' ');
    dom.leftContainer.className = dom.leftContainer.className.replace(new RegExp('(?:^|\\s)' + 'vis-vertical-scroll' + '(?:\\s|$)'), ' ');
    props.left.width = dom.leftContainer.clientWidth || -props.border.left;
    props.right.width = dom.rightContainer.clientWidth || -props.border.right;

    this._setDOM();
  } // enable/disable vertical panning


  var contentsOverflow = props.center.height > props.centerContainer.height;
  this.hammer.get('pan').set({
    direction: contentsOverflow ? hammer$1.DIRECTION_ALL : hammer$1.DIRECTION_HORIZONTAL
  }); // redraw all components

  this.components.forEach(function (component) {
    resized = component.redraw() || resized;
  });
  var MAX_REDRAW = 5;

  if (resized) {
    if (this.redrawCount < MAX_REDRAW) {
      this.body.emitter.emit('_change');
      return;
    } else {
      console.log('WARNING: infinite loop in redraw?');
    }
  } else {
    this.redrawCount = 0;
  } //Emit public 'changed' event for UI updates, see issue #1592


  this.body.emitter.emit("changed");
};

Core.prototype._setDOM = function () {
  var props = this.props;
  var dom = this.dom;
  props.leftContainer.width = props.left.width;
  props.rightContainer.width = props.right.width;
  var centerWidth = props.root.width - props.left.width - props.right.width - props.borderRootWidth;
  props.center.width = centerWidth;
  props.centerContainer.width = centerWidth;
  props.top.width = centerWidth;
  props.bottom.width = centerWidth; // resize the panels

  dom.background.style.height = props.background.height + 'px';
  dom.backgroundVertical.style.height = props.background.height + 'px';
  dom.backgroundHorizontal.style.height = props.centerContainer.height + 'px';
  dom.centerContainer.style.height = props.centerContainer.height + 'px';
  dom.leftContainer.style.height = props.leftContainer.height + 'px';
  dom.rightContainer.style.height = props.rightContainer.height + 'px';
  dom.background.style.width = props.background.width + 'px';
  dom.backgroundVertical.style.width = props.centerContainer.width + 'px';
  dom.backgroundHorizontal.style.width = props.background.width + 'px';
  dom.centerContainer.style.width = props.center.width + 'px';
  dom.top.style.width = props.top.width + 'px';
  dom.bottom.style.width = props.bottom.width + 'px'; // reposition the panels

  dom.background.style.left = '0';
  dom.background.style.top = '0';
  dom.backgroundVertical.style.left = props.left.width + props.border.left + 'px';
  dom.backgroundVertical.style.top = '0';
  dom.backgroundHorizontal.style.left = '0';
  dom.backgroundHorizontal.style.top = props.top.height + 'px';
  dom.centerContainer.style.left = props.left.width + 'px';
  dom.centerContainer.style.top = props.top.height + 'px';
  dom.leftContainer.style.left = '0';
  dom.leftContainer.style.top = props.top.height + 'px';
  dom.rightContainer.style.left = props.left.width + props.center.width + 'px';
  dom.rightContainer.style.top = props.top.height + 'px';
  dom.top.style.left = props.left.width + 'px';
  dom.top.style.top = '0';
  dom.bottom.style.left = props.left.width + 'px';
  dom.bottom.style.top = props.top.height + props.centerContainer.height + 'px';
  dom.center.style.left = '0';
  dom.left.style.left = '0';
  dom.right.style.left = '0';
}; // TODO: deprecated since version 1.1.0, remove some day


Core.prototype.repaint = function () {
  throw new Error('Function repaint is deprecated. Use redraw instead.');
};
/**
 * Set a current time. This can be used for example to ensure that a client's
 * time is synchronized with a shared server time.
 * Only applicable when option `showCurrentTime` is true.
 * @param {Date | string | number} time     A Date, unix timestamp, or
 *                                          ISO date string.
 */


Core.prototype.setCurrentTime = function (time) {
  if (!this.currentTime) {
    throw new Error('Option showCurrentTime must be true');
  }

  this.currentTime.setCurrentTime(time);
};
/**
 * Get the current time.
 * Only applicable when option `showCurrentTime` is true.
 * @return {Date} Returns the current time.
 */


Core.prototype.getCurrentTime = function () {
  if (!this.currentTime) {
    throw new Error('Option showCurrentTime must be true');
  }

  return this.currentTime.getCurrentTime();
};
/**
 * Convert a position on screen (pixels) to a datetime
 * @param {int}     x    Position on the screen in pixels
 * @return {Date}   time The datetime the corresponds with given position x
 * @protected
 */
// TODO: move this function to Range


Core.prototype._toTime = function (x) {
  return DateUtil.toTime(this, x, this.props.center.width);
};
/**
 * Convert a position on the global screen (pixels) to a datetime
 * @param {int}     x    Position on the screen in pixels
 * @return {Date}   time The datetime the corresponds with given position x
 * @protected
 */
// TODO: move this function to Range


Core.prototype._toGlobalTime = function (x) {
  return DateUtil.toTime(this, x, this.props.root.width); //var conversion = this.range.conversion(this.props.root.width);
  //return new Date(x / conversion.scale + conversion.offset);
};
/**
 * Convert a datetime (Date object) into a position on the screen
 * @param {Date}   time A date
 * @return {int}   x    The position on the screen in pixels which corresponds
 *                      with the given date.
 * @protected
 */
// TODO: move this function to Range


Core.prototype._toScreen = function (time) {
  return DateUtil.toScreen(this, time, this.props.center.width);
};
/**
 * Convert a datetime (Date object) into a position on the root
 * This is used to get the pixel density estimate for the screen, not the center panel
 * @param {Date}   time A date
 * @return {int}   x    The position on root in pixels which corresponds
 *                      with the given date.
 * @protected
 */
// TODO: move this function to Range


Core.prototype._toGlobalScreen = function (time) {
  return DateUtil.toScreen(this, time, this.props.root.width); //var conversion = this.range.conversion(this.props.root.width);
  //return (time.valueOf() - conversion.offset) * conversion.scale;
};
/**
 * Initialize watching when option autoResize is true
 * @private
 */


Core.prototype._initAutoResize = function () {
  if (this.options.autoResize == true) {
    this._startAutoResize();
  } else {
    this._stopAutoResize();
  }
};
/**
 * Watch for changes in the size of the container. On resize, the Panel will
 * automatically redraw itself.
 * @private
 */


Core.prototype._startAutoResize = function () {
  var me = this;

  this._stopAutoResize();

  this._onResize = function () {
    if (me.options.autoResize != true) {
      // stop watching when the option autoResize is changed to false
      me._stopAutoResize();

      return;
    }

    if (me.dom.root) {
      // check whether the frame is resized
      // Note: we compare offsetWidth here, not clientWidth. For some reason,
      // IE does not restore the clientWidth from 0 to the actual width after
      // changing the timeline's container display style from none to visible
      if (me.dom.root.offsetWidth != me.props.lastWidth || me.dom.root.offsetHeight != me.props.lastHeight) {
        me.props.lastWidth = me.dom.root.offsetWidth;
        me.props.lastHeight = me.dom.root.offsetHeight;
        me.props.scrollbarWidth = util.getScrollBarWidth();
        me.body.emitter.emit('_change');
      }
    }
  }; // add event listener to window resize


  util.addEventListener(window, 'resize', this._onResize); //Prevent initial unnecessary redraw

  if (me.dom.root) {
    me.props.lastWidth = me.dom.root.offsetWidth;
    me.props.lastHeight = me.dom.root.offsetHeight;
  }

  this.watchTimer = setInterval(this._onResize, 1000);
};
/**
 * Stop watching for a resize of the frame.
 * @private
 */


Core.prototype._stopAutoResize = function () {
  if (this.watchTimer) {
    clearInterval(this.watchTimer);
    this.watchTimer = undefined;
  } // remove event listener on window.resize


  if (this._onResize) {
    util.removeEventListener(window, 'resize', this._onResize);
    this._onResize = null;
  }
};
/**
 * Start moving the timeline vertically
 * @param {Event} event
 * @private
 */


Core.prototype._onTouch = function (event) {
  // eslint-disable-line no-unused-vars
  this.touch.allowDragging = true;
  this.touch.initialScrollTop = this.props.scrollTop;
};
/**
 * Start moving the timeline vertically
 * @param {Event} event
 * @private
 */


Core.prototype._onPinch = function (event) {
  // eslint-disable-line no-unused-vars
  this.touch.allowDragging = false;
};
/**
 * Move the timeline vertically
 * @param {Event} event
 * @private
 */


Core.prototype._onDrag = function (event) {
  if (!event) return; // refuse to drag when we where pinching to prevent the timeline make a jump
  // when releasing the fingers in opposite order from the touch screen

  if (!this.touch.allowDragging) return;
  var delta = event.deltaY;

  var oldScrollTop = this._getScrollTop();

  var newScrollTop = this._setScrollTop(this.touch.initialScrollTop + delta);

  if (this.options.verticalScroll) {
    this.dom.left.parentNode.scrollTop = -this.props.scrollTop;
    this.dom.right.parentNode.scrollTop = -this.props.scrollTop;
  }

  if (newScrollTop != oldScrollTop) {
    this.emit("verticalDrag");
  }
};
/**
 * Apply a scrollTop
 * @param {number} scrollTop
 * @returns {number} scrollTop  Returns the applied scrollTop
 * @private
 */


Core.prototype._setScrollTop = function (scrollTop) {
  this.props.scrollTop = scrollTop;

  this._updateScrollTop();

  return this.props.scrollTop;
};
/**
 * Update the current scrollTop when the height of  the containers has been changed
 * @returns {number} scrollTop  Returns the applied scrollTop
 * @private
 */


Core.prototype._updateScrollTop = function () {
  // recalculate the scrollTopMin
  var scrollTopMin = Math.min(this.props.centerContainer.height - this.props.center.height, 0); // is negative or zero

  if (scrollTopMin != this.props.scrollTopMin) {
    // in case of bottom orientation, change the scrollTop such that the contents
    // do not move relative to the time axis at the bottom
    if (this.options.orientation.item != 'top') {
      this.props.scrollTop += scrollTopMin - this.props.scrollTopMin;
    }

    this.props.scrollTopMin = scrollTopMin;
  } // limit the scrollTop to the feasible scroll range


  if (this.props.scrollTop > 0) this.props.scrollTop = 0;
  if (this.props.scrollTop < scrollTopMin) this.props.scrollTop = scrollTopMin;

  if (this.options.verticalScroll) {
    this.dom.left.parentNode.scrollTop = -this.props.scrollTop;
    this.dom.right.parentNode.scrollTop = -this.props.scrollTop;
  }

  return this.props.scrollTop;
};
/**
 * Get the current scrollTop
 * @returns {number} scrollTop
 * @private
 */


Core.prototype._getScrollTop = function () {
  return this.props.scrollTop;
};
/**
 * Load a configurator
 * [at]returns {Object}
 * @private
 */


Core.prototype._createConfigurator = function () {
  throw new Error('Cannot invoke abstract method _createConfigurator');
};

/**
 * A current time bar
 * @param {{range: Range, dom: Object, domProps: Object}} body
 * @param {Object} [options]        Available parameters:
 *                                  {Boolean} [showCurrentTime]
 *                                  {String}  [alignCurrentTime]
 * @constructor CurrentTime
 * @extends Component
 */

function CurrentTime(body, options) {
  this.body = body; // default options

  this.defaultOptions = {
    rtl: false,
    showCurrentTime: true,
    alignCurrentTime: undefined,
    moment: moment$3,
    locales: locales,
    locale: 'en'
  };
  this.options = util.extend({}, this.defaultOptions);
  this.offset = 0;

  this._create();

  this.setOptions(options);
}

CurrentTime.prototype = new Component_1();
/**
 * Create the HTML DOM for the current time bar
 * @private
 */

CurrentTime.prototype._create = function () {
  var bar = document.createElement('div');
  bar.className = 'vis-current-time';
  bar.style.position = 'absolute';
  bar.style.top = '0px';
  bar.style.height = '100%';
  this.bar = bar;
};
/**
 * Destroy the CurrentTime bar
 */


CurrentTime.prototype.destroy = function () {
  this.options.showCurrentTime = false;
  this.redraw(); // will remove the bar from the DOM and stop refreshing

  this.body = null;
};
/**
 * Set options for the component. Options will be merged in current options.
 * @param {Object} options  Available parameters:
 *                          {boolean} [showCurrentTime]
 *                          {String}  [alignCurrentTime]
 */


CurrentTime.prototype.setOptions = function (options) {
  if (options) {
    // copy all options that we know
    util.selectiveExtend(['rtl', 'showCurrentTime', 'alignCurrentTime', 'moment', 'locale', 'locales'], this.options, options);
  }
};
/**
 * Repaint the component
 * @return {boolean} Returns true if the component is resized
 */


CurrentTime.prototype.redraw = function () {
  if (this.options.showCurrentTime) {
    var parent = this.body.dom.backgroundVertical;

    if (this.bar.parentNode != parent) {
      // attach to the dom
      if (this.bar.parentNode) {
        this.bar.parentNode.removeChild(this.bar);
      }

      parent.appendChild(this.bar);
      this.start();
    }

    var now = this.options.moment(new Date().valueOf() + this.offset);

    if (this.options.alignCurrentTime) {
      now = now.startOf(this.options.alignCurrentTime);
    }

    var x = this.body.util.toScreen(now);
    var locale = this.options.locales[this.options.locale];

    if (!locale) {
      if (!this.warned) {
        console.log('WARNING: options.locales[\'' + this.options.locale + '\'] not found. See http://visjs.org/docs/timeline/#Localization');
        this.warned = true;
      }

      locale = this.options.locales['en']; // fall back on english when not available
    }

    var title = locale.current + ' ' + locale.time + ': ' + now.format('dddd, MMMM Do YYYY, H:mm:ss');
    title = title.charAt(0).toUpperCase() + title.substring(1);

    if (this.options.rtl) {
      this.bar.style.right = x + 'px';
    } else {
      this.bar.style.left = x + 'px';
    }

    this.bar.title = title;
  } else {
    // remove the line from the DOM
    if (this.bar.parentNode) {
      this.bar.parentNode.removeChild(this.bar);
    }

    this.stop();
  }

  return false;
};
/**
 * Start auto refreshing the current time bar
 */


CurrentTime.prototype.start = function () {
  var me = this;
  /**
   *  Updates the current time.
   */

  function update() {
    me.stop(); // determine interval to refresh

    var scale = me.body.range.conversion(me.body.domProps.center.width).scale;
    var interval = 1 / scale / 10;
    if (interval < 30) interval = 30;
    if (interval > 1000) interval = 1000;
    me.redraw();
    me.body.emitter.emit('currentTimeTick'); // start a renderTimer to adjust for the new time

    me.currentTimeTimer = setTimeout(update, interval);
  }

  update();
};
/**
 * Stop auto refreshing the current time bar
 */


CurrentTime.prototype.stop = function () {
  if (this.currentTimeTimer !== undefined) {
    clearTimeout(this.currentTimeTimer);
    delete this.currentTimeTimer;
  }
};
/**
 * Set a current time. This can be used for example to ensure that a client's
 * time is synchronized with a shared server time.
 * @param {Date | string | number} time     A Date, unix timestamp, or
 *                                          ISO date string.
 */


CurrentTime.prototype.setCurrentTime = function (time) {
  var t = util.convert(time, 'Date').valueOf();
  var now = new Date().valueOf();
  this.offset = t - now;
  this.redraw();
};
/**
 * Get the current time.
 * @return {Date} Returns the current time.
 */


CurrentTime.prototype.getCurrentTime = function () {
  return new Date(new Date().valueOf() + this.offset);
};

var CurrentTime_1 = CurrentTime;

var Stack = createCommonjsModule$1(function (module, exports) {
  // Utility functions for ordering and stacking of items
  var EPSILON = 0.001; // used when checking collisions, to prevent round-off errors

  /**
   * Order items by their start data
   * @param {Item[]} items
   */

  exports.orderByStart = function (items) {
    items.sort(function (a, b) {
      return a.data.start - b.data.start;
    });
  };
  /**
   * Order items by their end date. If they have no end date, their start date
   * is used.
   * @param {Item[]} items
   */


  exports.orderByEnd = function (items) {
    items.sort(function (a, b) {
      var aTime = 'end' in a.data ? a.data.end : a.data.start,
          bTime = 'end' in b.data ? b.data.end : b.data.start;
      return aTime - bTime;
    });
  };
  /**
   * Adjust vertical positions of the items such that they don't overlap each
   * other.
   * @param {Item[]} items
   *            All visible items
   * @param {{item: {horizontal: number, vertical: number}, axis: number}} margin
   *            Margins between items and between items and the axis.
   * @param {boolean} [force=false]
   *            If true, all items will be repositioned. If false (default), only
   *            items having a top===null will be re-stacked
   * @param {function} shouldBailItemsRedrawFunction
   *            bailing function
   * @return {boolean} shouldBail
   */


  exports.stack = function (items, margin, force, shouldBailItemsRedrawFunction) {
    if (force) {
      // reset top position of all items
      for (var i = 0; i < items.length; i++) {
        items[i].top = null;
      }
    } // calculate new, non-overlapping positions


    for (var i = 0; i < items.length; i++) {
      // eslint-disable-line no-redeclare
      var item = items[i];

      if (item.stack && item.top === null) {
        // initialize top position
        item.top = margin.axis;
        var shouldBail = false;

        do {
          // TODO: optimize checking for overlap. when there is a gap without items,
          //       you only need to check for items from the next item on, not from zero
          var collidingItem = null;

          for (var j = 0, jj = items.length; j < jj; j++) {
            var other = items[j];
            shouldBail = shouldBailItemsRedrawFunction() || false;

            if (shouldBail) {
              return true;
            }

            if (other.top !== null && other !== item && other.stack && exports.collision(item, other, margin.item, other.options.rtl)) {
              collidingItem = other;
              break;
            }
          }

          if (collidingItem != null) {
            // There is a collision. Reposition the items above the colliding element
            item.top = collidingItem.top + collidingItem.height + margin.item.vertical;
          }
        } while (collidingItem);
      }
    }

    return shouldBail;
  };
  /**
   * Adjust vertical positions of the items within a single subgroup such that they 
   * don't overlap each other.
   * @param {Item[]} items
   *            All items withina subgroup
   * @param {{item: {horizontal: number, vertical: number}, axis: number}} margin
   *            Margins between items and between items and the axis.
   * @param {subgroup} subgroup
   *            The subgroup that is being stacked 
   */


  exports.substack = function (items, margin, subgroup) {
    for (var i = 0; i < items.length; i++) {
      items[i].top = null;
    } // Set the initial height


    var subgroupHeight = subgroup.height; // calculate new, non-overlapping positions

    for (i = 0; i < items.length; i++) {
      var item = items[i];

      if (item.stack && item.top === null) {
        // initialize top position
        item.top = item.baseTop; //margin.axis + item.baseTop;

        do {
          // TODO: optimize checking for overlap. when there is a gap without items,
          //       you only need to check for items from the next item on, not from zero
          var collidingItem = null;

          for (var j = 0, jj = items.length; j < jj; j++) {
            var other = items[j];

            if (other.top !== null && other !== item
            /*&& other.stack*/
            && exports.collision(item, other, margin.item, other.options.rtl)) {
              collidingItem = other;
              break;
            }
          }

          if (collidingItem != null) {
            // There is a collision. Reposition the items above the colliding element
            item.top = collidingItem.top + collidingItem.height + margin.item.vertical; // + item.baseTop;
          }

          if (item.top + item.height > subgroupHeight) {
            subgroupHeight = item.top + item.height;
          }
        } while (collidingItem);
      }
    } // Set the new height


    subgroup.height = subgroupHeight - subgroup.top + 0.5 * margin.item.vertical;
  };
  /**
   * Adjust vertical positions of the items without stacking them
   * @param {Item[]} items
   *            All visible items
   * @param {{item: {horizontal: number, vertical: number}, axis: number}} margin
   *            Margins between items and between items and the axis.
   * @param {subgroups[]} subgroups
   *            All subgroups
   * @param {boolean} stackSubgroups
   */


  exports.nostack = function (items, margin, subgroups, stackSubgroups) {
    for (var i = 0; i < items.length; i++) {
      if (items[i].data.subgroup == undefined) {
        items[i].top = margin.item.vertical;
      } else if (items[i].data.subgroup !== undefined && stackSubgroups) {
        var newTop = 0;

        for (var subgroup in subgroups) {
          if (subgroups.hasOwnProperty(subgroup)) {
            if (subgroups[subgroup].visible == true && subgroups[subgroup].index < subgroups[items[i].data.subgroup].index) {
              newTop += subgroups[subgroup].height;
              subgroups[items[i].data.subgroup].top = newTop;
            }
          }
        }

        items[i].top = newTop + 0.5 * margin.item.vertical;
      }
    }

    if (!stackSubgroups) {
      exports.stackSubgroups(items, margin, subgroups);
    }
  };
  /**
   * Adjust vertical positions of the subgroups such that they don't overlap each
   * other.
   * @param {Array.<vis.Item>} items
   * @param {{item: {horizontal: number, vertical: number}, axis: number}} margin Margins between items and between items and the axis.
   * @param {subgroups[]} subgroups
   *            All subgroups
   */


  exports.stackSubgroups = function (items, margin, subgroups) {
    for (var subgroup in subgroups) {
      if (subgroups.hasOwnProperty(subgroup)) {
        subgroups[subgroup].top = 0;

        do {
          // TODO: optimize checking for overlap. when there is a gap without items,
          //       you only need to check for items from the next item on, not from zero
          var collidingItem = null;

          for (var otherSubgroup in subgroups) {
            if (subgroups[otherSubgroup].top !== null && otherSubgroup !== subgroup && subgroups[subgroup].index > subgroups[otherSubgroup].index && exports.collisionByTimes(subgroups[subgroup], subgroups[otherSubgroup])) {
              collidingItem = subgroups[otherSubgroup];
              break;
            }
          }

          if (collidingItem != null) {
            // There is a collision. Reposition the subgroups above the colliding element
            subgroups[subgroup].top = collidingItem.top + collidingItem.height;
          }
        } while (collidingItem);
      }
    }

    for (var i = 0; i < items.length; i++) {
      if (items[i].data.subgroup !== undefined) {
        items[i].top = subgroups[items[i].data.subgroup].top + 0.5 * margin.item.vertical;
      }
    }
  };
  /**
   * Adjust vertical positions of the subgroups such that they don't overlap each
   * other, then stacks the contents of each subgroup individually.
   * @param {Item[]} subgroupItems
   *            All the items in a subgroup
   * @param {{item: {horizontal: number, vertical: number}, axis: number}} margin
   *            Margins between items and between items and the axis.
   * @param {subgroups[]} subgroups
   *            All subgroups 
   */


  exports.stackSubgroupsWithInnerStack = function (subgroupItems, margin, subgroups) {
    var doSubStack = false; // Run subgroups in their order (if any)

    var subgroupOrder = [];

    for (var subgroup in subgroups) {
      if (subgroups[subgroup].hasOwnProperty("index")) {
        subgroupOrder[subgroups[subgroup].index] = subgroup;
      } else {
        subgroupOrder.push(subgroup);
      }
    }

    for (var j = 0; j < subgroupOrder.length; j++) {
      subgroup = subgroupOrder[j];

      if (subgroups.hasOwnProperty(subgroup)) {
        doSubStack = doSubStack || subgroups[subgroup].stack;
        subgroups[subgroup].top = 0;

        for (var otherSubgroup in subgroups) {
          if (subgroups[otherSubgroup].visible && subgroups[subgroup].index > subgroups[otherSubgroup].index) {
            subgroups[subgroup].top += subgroups[otherSubgroup].height;
          }
        }

        var items = subgroupItems[subgroup];

        for (var i = 0; i < items.length; i++) {
          if (items[i].data.subgroup !== undefined) {
            items[i].top = subgroups[items[i].data.subgroup].top + 0.5 * margin.item.vertical;

            if (subgroups[subgroup].stack) {
              items[i].baseTop = items[i].top;
            }
          }
        }

        if (doSubStack && subgroups[subgroup].stack) {
          exports.substack(subgroupItems[subgroup], margin, subgroups[subgroup]);
        }
      }
    }
  };
  /**
   * Test if the two provided items collide
   * The items must have parameters left, width, top, and height.
   * @param {Item} a          The first item
   * @param {Item} b          The second item
   * @param {{horizontal: number, vertical: number}} margin
   *                          An object containing a horizontal and vertical
   *                          minimum required margin.
   * @param {boolean} rtl
   * @return {boolean}        true if a and b collide, else false
   */


  exports.collision = function (a, b, margin, rtl) {
    if (rtl) {
      return a.right - margin.horizontal + EPSILON < b.right + b.width && a.right + a.width + margin.horizontal - EPSILON > b.right && a.top - margin.vertical + EPSILON < b.top + b.height && a.top + a.height + margin.vertical - EPSILON > b.top;
    } else {
      return a.left - margin.horizontal + EPSILON < b.left + b.width && a.left + a.width + margin.horizontal - EPSILON > b.left && a.top - margin.vertical + EPSILON < b.top + b.height && a.top + a.height + margin.vertical - EPSILON > b.top;
    }
  };
  /**
   * Test if the two provided objects collide
   * The objects must have parameters start, end, top, and height.
   * @param {Object} a          The first Object
   * @param {Object} b          The second Object
   * @return {boolean}        true if a and b collide, else false
   */


  exports.collisionByTimes = function (a, b) {
    return a.start <= b.start && a.end >= b.start && a.top < b.top + b.height && a.top + a.height > b.top || b.start <= a.start && b.end >= a.start && b.top < a.top + a.height && b.top + b.height > a.top;
  };
});
var Stack_1 = Stack.orderByStart;
var Stack_2 = Stack.orderByEnd;
var Stack_3 = Stack.stack;
var Stack_4 = Stack.substack;
var Stack_5 = Stack.nostack;
var Stack_6 = Stack.stackSubgroups;
var Stack_7 = Stack.stackSubgroupsWithInnerStack;
var Stack_8 = Stack.collision;
var Stack_9 = Stack.collisionByTimes;

/**
 * @param {number | string} groupId
 * @param {Object} data
 * @param {ItemSet} itemSet
 * @constructor Group
 */

function Group(groupId, data, itemSet) {
  this.groupId = groupId;
  this.subgroups = {};
  this.subgroupStack = {};
  this.subgroupStackAll = false;
  this.doInnerStack = false;
  this.shouldBailStackItems = false;
  this.subgroupIndex = 0;
  this.subgroupOrderer = data && data.subgroupOrder;
  this.itemSet = itemSet;
  this.isVisible = null;
  this.stackDirty = true; // if true, items will be restacked on next redraw

  if (data && data.nestedGroups) {
    this.nestedGroups = data.nestedGroups;

    if (data.showNested == false) {
      this.showNested = false;
    } else {
      this.showNested = true;
    }
  }

  if (data && data.subgroupStack) {
    if (typeof data.subgroupStack === "boolean") {
      this.doInnerStack = data.subgroupStack;
      this.subgroupStackAll = data.subgroupStack;
    } else {
      // We might be doing stacking on specific sub groups, but only
      // if at least one is set to do stacking
      for (var key in data.subgroupStack) {
        this.subgroupStack[key] = data.subgroupStack[key];
        this.doInnerStack = this.doInnerStack || data.subgroupStack[key];
      }
    }
  }

  if (data && data.heightMode) {
    this.heightMode = data.heightMode;
  } else {
    this.heightMode = itemSet.options.groupHeightMode;
  }

  this.nestedInGroup = null;
  this.dom = {};
  this.props = {
    label: {
      width: 0,
      height: 0
    }
  };
  this.className = null;
  this.items = {}; // items filtered by groupId of this group

  this.visibleItems = []; // items currently visible in window

  this.itemsInRange = []; // items currently in range

  this.orderedItems = {
    byStart: [],
    byEnd: []
  };
  this.checkRangedItems = false; // needed to refresh the ranged items if the window is programatically changed with NO overlap.

  var me = this;
  this.itemSet.body.emitter.on("checkRangedItems", function () {
    me.checkRangedItems = true;
  });

  this._create();

  this.setData(data);
}
/**
 * Create DOM elements for the group
 * @private
 */


Group.prototype._create = function () {
  var label = document.createElement('div');

  if (this.itemSet.options.groupEditable.order) {
    label.className = 'vis-label draggable';
  } else {
    label.className = 'vis-label';
  }

  if (this.itemSet.options.groupLabelDirection === 'vertical') {
    label.className += ' vertical';
  }

  this.dom.label = label;
  var inner = document.createElement('div');
  inner.className = 'vis-inner';
  label.appendChild(inner);
  this.dom.inner = inner;
  var foreground = document.createElement('div');
  foreground.className = 'vis-group';
  foreground['timeline-group'] = this;
  this.dom.foreground = foreground;
  this.dom.background = document.createElement('div');
  this.dom.background.className = 'vis-group';
  this.dom.axis = document.createElement('div');
  this.dom.axis.className = 'vis-group'; // create a hidden marker to detect when the Timelines container is attached
  // to the DOM, or the style of a parent of the Timeline is changed from
  // display:none is changed to visible.

  this.dom.marker = document.createElement('div');
  this.dom.marker.style.visibility = 'hidden';
  this.dom.marker.style.position = 'absolute';
  this.dom.marker.innerHTML = '';
  this.dom.background.appendChild(this.dom.marker);
};
/**
 * Set the group data for this group
 * @param {Object} data   Group data, can contain properties content and className
 */


Group.prototype.setData = function (data) {
  // update contents
  var content;
  var templateFunction;

  if (this.itemSet.options && this.itemSet.options.groupTemplate) {
    templateFunction = this.itemSet.options.groupTemplate.bind(this);
    content = templateFunction(data, this.dom.inner);
  } else {
    content = data && data.content;
  }

  if (content instanceof Element) {
    while (this.dom.inner.firstChild) {
      this.dom.inner.removeChild(this.dom.inner.firstChild);
    }

    this.dom.inner.appendChild(content);
  } else if (content instanceof Object && content.isReactComponent) ; else if (content instanceof Object) {
    templateFunction(data, this.dom.inner);
  } else if (content !== undefined && content !== null) {
    this.dom.inner.innerHTML = content;
  } else {
    this.dom.inner.innerHTML = this.groupId || ''; // groupId can be null
  } // update title


  this.dom.label.title = data && data.title || '';

  if (!this.dom.inner.firstChild) {
    util.addClassName(this.dom.inner, 'vis-hidden');
  } else {
    util.removeClassName(this.dom.inner, 'vis-hidden');
  }

  if (data && data.nestedGroups) {
    if (!this.nestedGroups || this.nestedGroups != data.nestedGroups) {
      this.nestedGroups = data.nestedGroups;
    }

    if (data.showNested !== undefined || this.showNested === undefined) {
      if (data.showNested == false) {
        this.showNested = false;
      } else {
        this.showNested = true;
      }
    }

    util.addClassName(this.dom.label, 'vis-nesting-group');
    var collapsedDirClassName = this.itemSet.options.rtl ? 'collapsed-rtl' : 'collapsed';

    if (this.showNested) {
      util.removeClassName(this.dom.label, collapsedDirClassName);
      util.addClassName(this.dom.label, 'expanded');
    } else {
      util.removeClassName(this.dom.label, 'expanded');
      util.addClassName(this.dom.label, collapsedDirClassName);
    }
  } else if (this.nestedGroups) {
    this.nestedGroups = null;
    collapsedDirClassName = this.itemSet.options.rtl ? 'collapsed-rtl' : 'collapsed';
    util.removeClassName(this.dom.label, collapsedDirClassName);
    util.removeClassName(this.dom.label, 'expanded');
    util.removeClassName(this.dom.label, 'vis-nesting-group');
  }

  if (data && data.nestedInGroup) {
    util.addClassName(this.dom.label, 'vis-nested-group');

    if (this.itemSet.options && this.itemSet.options.rtl) {
      this.dom.inner.style.paddingRight = '30px';
    } else {
      this.dom.inner.style.paddingLeft = '30px';
    }
  } // update className


  var className = data && data.className || null;

  if (className != this.className) {
    if (this.className) {
      util.removeClassName(this.dom.label, this.className);
      util.removeClassName(this.dom.foreground, this.className);
      util.removeClassName(this.dom.background, this.className);
      util.removeClassName(this.dom.axis, this.className);
    }

    util.addClassName(this.dom.label, className);
    util.addClassName(this.dom.foreground, className);
    util.addClassName(this.dom.background, className);
    util.addClassName(this.dom.axis, className);
    this.className = className;
  } // update style


  if (this.style) {
    util.removeCssText(this.dom.label, this.style);
    this.style = null;
  }

  if (data && data.style) {
    util.addCssText(this.dom.label, data.style);
    this.style = data.style;
  }
};
/**
 * Get the width of the group label
 * @return {number} width
 */


Group.prototype.getLabelWidth = function () {
  return this.props.label.width;
};

Group.prototype._didMarkerHeightChange = function () {
  var markerHeight = this.dom.marker.clientHeight;

  if (markerHeight != this.lastMarkerHeight) {
    this.lastMarkerHeight = markerHeight;
    var redrawQueue = {};
    var redrawQueueLength = 0;
    util.forEach(this.items, function (item, key) {
      item.dirty = true;

      if (item.displayed) {
        var returnQueue = true;
        redrawQueue[key] = item.redraw(returnQueue);
        redrawQueueLength = redrawQueue[key].length;
      }
    });
    var needRedraw = redrawQueueLength > 0;

    if (needRedraw) {
      // redraw all regular items
      for (var i = 0; i < redrawQueueLength; i++) {
        util.forEach(redrawQueue, function (fns) {
          fns[i]();
        });
      }
    }

    return true;
  }
};

Group.prototype._calculateGroupSizeAndPosition = function () {
  var offsetTop = this.dom.foreground.offsetTop;
  var offsetLeft = this.dom.foreground.offsetLeft;
  var offsetWidth = this.dom.foreground.offsetWidth;
  this.top = offsetTop;
  this.right = offsetLeft;
  this.width = offsetWidth;
};

Group.prototype._shouldBailItemsRedraw = function () {
  var me = this;
  var timeoutOptions = this.itemSet.options.onTimeout;
  var bailOptions = {
    relativeBailingTime: this.itemSet.itemsSettingTime,
    bailTimeMs: timeoutOptions && timeoutOptions.timeoutMs,
    userBailFunction: timeoutOptions && timeoutOptions.callback,
    shouldBailStackItems: this.shouldBailStackItems
  };
  var bail = null;

  if (!this.itemSet.initialDrawDone) {
    if (bailOptions.shouldBailStackItems) {
      return true;
    }

    if (Math.abs(new Date() - new Date(bailOptions.relativeBailingTime)) > bailOptions.bailTimeMs) {
      if (bailOptions.userBailFunction && this.itemSet.userContinueNotBail == null) {
        bailOptions.userBailFunction(function (didUserContinue) {
          me.itemSet.userContinueNotBail = didUserContinue;
          bail = !didUserContinue;
        });
      } else if (me.itemSet.userContinueNotBail == false) {
        bail = true;
      } else {
        bail = false;
      }
    }
  }

  return bail;
};

Group.prototype._redrawItems = function (forceRestack, lastIsVisible, margin, range) {
  var restack = forceRestack || this.stackDirty || this.isVisible && !lastIsVisible; // if restacking, reposition visible items vertically

  if (restack) {
    var visibleSubgroups = {};
    var subgroup = null;

    if (typeof this.itemSet.options.order === 'function') {
      // a custom order function
      // brute force restack of all items
      // show all items
      var me = this;
      var limitSize = false;
      var redrawQueue = {};
      var redrawQueueLength = 0;
      util.forEach(this.items, function (item, key) {
        if (!item.displayed && (item.isVisible(range) || !item.dom)) {
          var returnQueue = true;
          redrawQueue[key] = item.show(returnQueue);
          redrawQueueLength = redrawQueue[key].length;
          me.visibleItems.push(item);
        }
      });
      var needRedraw = redrawQueueLength > 0;

      if (needRedraw) {
        // redraw all regular items
        for (var i = 0; i < redrawQueueLength; i++) {
          util.forEach(redrawQueue, function (fns) {
            fns[i]();
          });
        }
      }

      util.forEach(this.items, function (item) {
        if (item.displayed) {
          item.repositionX(limitSize);
        }
      });

      if (this.doInnerStack && this.itemSet.options.stackSubgroups) {
        // Order the items within each subgroup
        for (subgroup in this.subgroups) {
          visibleSubgroups[subgroup] = this.subgroups[subgroup].items.slice().sort(function (a, b) {
            return me.itemSet.options.order(a.data, b.data);
          });
        }

        Stack.stackSubgroupsWithInnerStack(visibleSubgroups, margin, this.subgroups);
      } else {
        // order all items and force a restacking
        var customOrderedItems = this.orderedItems.byStart.slice().sort(function (a, b) {
          return me.itemSet.options.order(a.data, b.data);
        });
        this.shouldBailStackItems = Stack.stack(customOrderedItems, margin, true, this._shouldBailItemsRedraw.bind(this));
      }

      this.visibleItems = this._updateItemsInRange(this.orderedItems, this.visibleItems, range);
    } else {
      // no custom order function, lazy stacking
      this.visibleItems = this._updateItemsInRange(this.orderedItems, this.visibleItems, range);

      if (this.itemSet.options.stack) {
        if (this.doInnerStack && this.itemSet.options.stackSubgroups) {
          for (subgroup in this.subgroups) {
            visibleSubgroups[subgroup] = this.subgroups[subgroup].items;
          }

          Stack.stackSubgroupsWithInnerStack(visibleSubgroups, margin, this.subgroups);
        } else {
          // TODO: ugly way to access options...
          this.shouldBailStackItems = Stack.stack(this.visibleItems, margin, true, this._shouldBailItemsRedraw.bind(this));
        }
      } else {
        // no stacking
        Stack.nostack(this.visibleItems, margin, this.subgroups, this.itemSet.options.stackSubgroups);
      }
    }

    if (this.shouldBailStackItems) {
      this.itemSet.body.emitter.emit('destroyTimeline');
    }

    this.stackDirty = false;
  }
};

Group.prototype._didResize = function (resized, height) {
  resized = util.updateProperty(this, 'height', height) || resized; // recalculate size of label

  var boundingRect = this.dom.inner.getBoundingClientRect();
  var labelWidth = boundingRect.width;
  var labelHeight = boundingRect.height;
  resized = util.updateProperty(this.props.label, 'width', labelWidth) || resized;
  resized = util.updateProperty(this.props.label, 'height', labelHeight) || resized;
  return resized;
};

Group.prototype._applyGroupHeight = function (height) {
  this.dom.background.style.height = height + 'px';
  this.dom.foreground.style.height = height + 'px';
  this.dom.label.style.height = height + 'px';
}; // update vertical position of items after they are re-stacked and the height of the group is calculated


Group.prototype._updateItemsVerticalPosition = function (margin) {
  for (var i = 0, ii = this.visibleItems.length; i < ii; i++) {
    var item = this.visibleItems[i];
    item.repositionY(margin);

    if (!this.isVisible && this.groupId != "__background__") {
      if (item.displayed) item.hide();
    }
  }
};
/**
 * Repaint this group
 * @param {{start: number, end: number}} range
 * @param {{item: {horizontal: number, vertical: number}, axis: number}} margin
 * @param {boolean} [forceRestack=false]  Force restacking of all items
 * @param {boolean} [returnQueue=false]  return the queue or if the group resized
 * @return {boolean} Returns true if the group is resized or the redraw queue if returnQueue=true
 */


Group.prototype.redraw = function (range, margin, forceRestack, returnQueue) {
  var resized = false;
  var lastIsVisible = this.isVisible;
  var height;
  var queue = [// force recalculation of the height of the items when the marker height changed
  // (due to the Timeline being attached to the DOM or changed from display:none to visible)
  function () {
    forceRestack = this._didMarkerHeightChange.bind(this);
  }.bind(this), // recalculate the height of the subgroups
  this._updateSubGroupHeights.bind(this, margin), // calculate actual size and position
  this._calculateGroupSizeAndPosition.bind(this), // check if group is visible
  function () {
    this.isVisible = this._isGroupVisible.bind(this)(range, margin);
  }.bind(this), // redraw Items if needed
  function () {
    this._redrawItems.bind(this)(forceRestack, lastIsVisible, margin, range);
  }.bind(this), // update subgroups
  this._updateSubgroupsSizes.bind(this), // recalculate the height of the group
  function () {
    height = this._calculateHeight.bind(this)(margin);
  }.bind(this), // calculate actual size and position again
  this._calculateGroupSizeAndPosition.bind(this), // check if resized
  function () {
    resized = this._didResize.bind(this)(resized, height);
  }.bind(this), // apply group height
  function () {
    this._applyGroupHeight.bind(this)(height);
  }.bind(this), // update vertical position of items after they are re-stacked and the height of the group is calculated
  function () {
    this._updateItemsVerticalPosition.bind(this)(margin);
  }.bind(this), function () {
    if (!this.isVisible && this.height) {
      resized = false;
    }

    return resized;
  }];

  if (returnQueue) {
    return queue;
  } else {
    var result;
    queue.forEach(function (fn) {
      result = fn();
    });
    return result;
  }
};
/**
 * recalculate the height of the subgroups
 *
 * @param {{item: vis.Item}} margin
 * @private
 */


Group.prototype._updateSubGroupHeights = function (margin) {
  if (Object.keys(this.subgroups).length > 0) {
    var me = this;
    this.resetSubgroups();
    util.forEach(this.visibleItems, function (item) {
      if (item.data.subgroup !== undefined) {
        me.subgroups[item.data.subgroup].height = Math.max(me.subgroups[item.data.subgroup].height, item.height + margin.item.vertical);
        me.subgroups[item.data.subgroup].visible = true;
      }
    });
  }
};
/**
 * check if group is visible
 *
 * @param {vis.Range} range
 * @param {{axis: vis.DataAxis}} margin
 * @returns {boolean} is visible
 * @private
 */


Group.prototype._isGroupVisible = function (range, margin) {
  return this.top <= range.body.domProps.centerContainer.height - range.body.domProps.scrollTop + margin.axis && this.top + this.height + margin.axis >= -range.body.domProps.scrollTop;
};
/**
 * recalculate the height of the group
 * @param {{item: {horizontal: number, vertical: number}, axis: number}} margin
 * @returns {number} Returns the height
 * @private
 */


Group.prototype._calculateHeight = function (margin) {
  // recalculate the height of the group
  var height, items;

  if (this.heightMode === 'fixed') {
    items = util.toArray(this.items);
  } else {
    // default or 'auto'
    items = this.visibleItems;
  }

  if (items.length > 0) {
    var min = items[0].top;
    var max = items[0].top + items[0].height;
    util.forEach(items, function (item) {
      min = Math.min(min, item.top);
      max = Math.max(max, item.top + item.height);
    });

    if (min > margin.axis) {
      // there is an empty gap between the lowest item and the axis
      var offset = min - margin.axis;
      max -= offset;
      util.forEach(items, function (item) {
        item.top -= offset;
      });
    }

    height = max + margin.item.vertical / 2;
  } else {
    height = 0;
  }

  height = Math.max(height, this.props.label.height);
  return height;
};
/**
 * Show this group: attach to the DOM
 */


Group.prototype.show = function () {
  if (!this.dom.label.parentNode) {
    this.itemSet.dom.labelSet.appendChild(this.dom.label);
  }

  if (!this.dom.foreground.parentNode) {
    this.itemSet.dom.foreground.appendChild(this.dom.foreground);
  }

  if (!this.dom.background.parentNode) {
    this.itemSet.dom.background.appendChild(this.dom.background);
  }

  if (!this.dom.axis.parentNode) {
    this.itemSet.dom.axis.appendChild(this.dom.axis);
  }
};
/**
 * Hide this group: remove from the DOM
 */


Group.prototype.hide = function () {
  var label = this.dom.label;

  if (label.parentNode) {
    label.parentNode.removeChild(label);
  }

  var foreground = this.dom.foreground;

  if (foreground.parentNode) {
    foreground.parentNode.removeChild(foreground);
  }

  var background = this.dom.background;

  if (background.parentNode) {
    background.parentNode.removeChild(background);
  }

  var axis = this.dom.axis;

  if (axis.parentNode) {
    axis.parentNode.removeChild(axis);
  }
};
/**
 * Add an item to the group
 * @param {Item} item
 */


Group.prototype.add = function (item) {
  this.items[item.id] = item;
  item.setParent(this);
  this.stackDirty = true; // add to

  if (item.data.subgroup !== undefined) {
    this._addToSubgroup(item);

    this.orderSubgroups();
  }

  if (this.visibleItems.indexOf(item) == -1) {
    var range = this.itemSet.body.range; // TODO: not nice accessing the range like this

    this._checkIfVisible(item, this.visibleItems, range);
  }
};

Group.prototype._addToSubgroup = function (item, subgroupId) {
  subgroupId = subgroupId || item.data.subgroup;

  if (subgroupId != undefined && this.subgroups[subgroupId] === undefined) {
    this.subgroups[subgroupId] = {
      height: 0,
      top: 0,
      start: item.data.start,
      end: item.data.end || item.data.start,
      visible: false,
      index: this.subgroupIndex,
      items: [],
      stack: this.subgroupStackAll || this.subgroupStack[subgroupId] || false
    };
    this.subgroupIndex++;
  }

  if (new Date(item.data.start) < new Date(this.subgroups[subgroupId].start)) {
    this.subgroups[subgroupId].start = item.data.start;
  }

  var itemEnd = item.data.end || item.data.start;

  if (new Date(itemEnd) > new Date(this.subgroups[subgroupId].end)) {
    this.subgroups[subgroupId].end = itemEnd;
  }

  this.subgroups[subgroupId].items.push(item);
};

Group.prototype._updateSubgroupsSizes = function () {
  var me = this;

  if (me.subgroups) {
    for (var subgroup in me.subgroups) {
      var initialEnd = me.subgroups[subgroup].items[0].data.end || me.subgroups[subgroup].items[0].data.start;
      var newStart = me.subgroups[subgroup].items[0].data.start;
      var newEnd = initialEnd - 1;
      me.subgroups[subgroup].items.forEach(function (item) {
        if (new Date(item.data.start) < new Date(newStart)) {
          newStart = item.data.start;
        }

        var itemEnd = item.data.end || item.data.start;

        if (new Date(itemEnd) > new Date(newEnd)) {
          newEnd = itemEnd;
        }
      });
      me.subgroups[subgroup].start = newStart;
      me.subgroups[subgroup].end = new Date(newEnd - 1); // -1 to compensate for colliding end to start subgroups;
    }
  }
};

Group.prototype.orderSubgroups = function () {
  if (this.subgroupOrderer !== undefined) {
    var sortArray = [];
    var subgroup;

    if (typeof this.subgroupOrderer == 'string') {
      for (subgroup in this.subgroups) {
        sortArray.push({
          subgroup: subgroup,
          sortField: this.subgroups[subgroup].items[0].data[this.subgroupOrderer]
        });
      }

      sortArray.sort(function (a, b) {
        return a.sortField - b.sortField;
      });
    } else if (typeof this.subgroupOrderer == 'function') {
      for (subgroup in this.subgroups) {
        sortArray.push(this.subgroups[subgroup].items[0].data);
      }

      sortArray.sort(this.subgroupOrderer);
    }

    if (sortArray.length > 0) {
      for (var i = 0; i < sortArray.length; i++) {
        this.subgroups[sortArray[i].subgroup].index = i;
      }
    }
  }
};

Group.prototype.resetSubgroups = function () {
  for (var subgroup in this.subgroups) {
    if (this.subgroups.hasOwnProperty(subgroup)) {
      this.subgroups[subgroup].visible = false;
      this.subgroups[subgroup].height = 0;
    }
  }
};
/**
 * Remove an item from the group
 * @param {Item} item
 */


Group.prototype.remove = function (item) {
  delete this.items[item.id];
  item.setParent(null);
  this.stackDirty = true; // remove from visible items

  var index = this.visibleItems.indexOf(item);
  if (index != -1) this.visibleItems.splice(index, 1);

  if (item.data.subgroup !== undefined) {
    this._removeFromSubgroup(item);

    this.orderSubgroups();
  }
};

Group.prototype._removeFromSubgroup = function (item, subgroupId) {
  subgroupId = subgroupId || item.data.subgroup;

  if (subgroupId != undefined) {
    var subgroup = this.subgroups[subgroupId];

    if (subgroup) {
      var itemIndex = subgroup.items.indexOf(item); //  Check the item is actually in this subgroup. How should items not in the group be handled?

      if (itemIndex >= 0) {
        subgroup.items.splice(itemIndex, 1);

        if (!subgroup.items.length) {
          delete this.subgroups[subgroupId];
        } else {
          this._updateSubgroupsSizes();
        }
      }
    }
  }
};
/**
 * Remove an item from the corresponding DataSet
 * @param {Item} item
 */


Group.prototype.removeFromDataSet = function (item) {
  this.itemSet.removeItem(item.id);
};
/**
 * Reorder the items
 */


Group.prototype.order = function () {
  var array = util.toArray(this.items);
  var startArray = [];
  var endArray = [];

  for (var i = 0; i < array.length; i++) {
    if (array[i].data.end !== undefined) {
      endArray.push(array[i]);
    }

    startArray.push(array[i]);
  }

  this.orderedItems = {
    byStart: startArray,
    byEnd: endArray
  };
  Stack.orderByStart(this.orderedItems.byStart);
  Stack.orderByEnd(this.orderedItems.byEnd);
};
/**
 * Update the visible items
 * @param {{byStart: Item[], byEnd: Item[]}} orderedItems   All items ordered by start date and by end date
 * @param {Item[]} oldVisibleItems                          The previously visible items.
 * @param {{start: number, end: number}} range              Visible range
 * @return {Item[]} visibleItems                            The new visible items.
 * @private
 */


Group.prototype._updateItemsInRange = function (orderedItems, oldVisibleItems, range) {
  var visibleItems = [];
  var visibleItemsLookup = {}; // we keep this to quickly look up if an item already exists in the list without using indexOf on visibleItems

  var interval = (range.end - range.start) / 4;
  var lowerBound = range.start - interval;
  var upperBound = range.end + interval; // this function is used to do the binary search.

  var searchFunction = function searchFunction(value) {
    if (value < lowerBound) {
      return -1;
    } else if (value <= upperBound) {
      return 0;
    } else {
      return 1;
    }
  }; // first check if the items that were in view previously are still in view.
  // IMPORTANT: this handles the case for the items with startdate before the window and enddate after the window!
  // also cleans up invisible items.


  if (oldVisibleItems.length > 0) {
    for (var i = 0; i < oldVisibleItems.length; i++) {
      this._checkIfVisibleWithReference(oldVisibleItems[i], visibleItems, visibleItemsLookup, range);
    }
  } // we do a binary search for the items that have only start values.


  var initialPosByStart = util.binarySearchCustom(orderedItems.byStart, searchFunction, 'data', 'start'); // trace the visible items from the inital start pos both ways until an invisible item is found, we only look at the start values.

  this._traceVisible(initialPosByStart, orderedItems.byStart, visibleItems, visibleItemsLookup, function (item) {
    return item.data.start < lowerBound || item.data.start > upperBound;
  }); // if the window has changed programmatically without overlapping the old window, the ranged items with start < lowerBound and end > upperbound are not shown.
  // We therefore have to brute force check all items in the byEnd list


  if (this.checkRangedItems == true) {
    this.checkRangedItems = false;

    for (i = 0; i < orderedItems.byEnd.length; i++) {
      this._checkIfVisibleWithReference(orderedItems.byEnd[i], visibleItems, visibleItemsLookup, range);
    }
  } else {
    // we do a binary search for the items that have defined end times.
    var initialPosByEnd = util.binarySearchCustom(orderedItems.byEnd, searchFunction, 'data', 'end'); // trace the visible items from the inital start pos both ways until an invisible item is found, we only look at the end values.

    this._traceVisible(initialPosByEnd, orderedItems.byEnd, visibleItems, visibleItemsLookup, function (item) {
      return item.data.end < lowerBound || item.data.end > upperBound;
    });
  }

  var redrawQueue = {};
  var redrawQueueLength = 0;

  for (i = 0; i < visibleItems.length; i++) {
    var item = visibleItems[i];

    if (!item.displayed) {
      var returnQueue = true;
      redrawQueue[i] = item.redraw(returnQueue);
      redrawQueueLength = redrawQueue[i].length;
    }
  }

  var needRedraw = redrawQueueLength > 0;

  if (needRedraw) {
    // redraw all regular items
    for (var j = 0; j < redrawQueueLength; j++) {
      util.forEach(redrawQueue, function (fns) {
        fns[j]();
      });
    }
  }

  for (i = 0; i < visibleItems.length; i++) {
    visibleItems[i].repositionX();
  }

  return visibleItems;
};

Group.prototype._traceVisible = function (initialPos, items, visibleItems, visibleItemsLookup, breakCondition) {
  if (initialPos != -1) {
    var i, item;

    for (i = initialPos; i >= 0; i--) {
      item = items[i];

      if (breakCondition(item)) {
        break;
      } else {
        if (visibleItemsLookup[item.id] === undefined) {
          visibleItemsLookup[item.id] = true;
          visibleItems.push(item);
        }
      }
    }

    for (i = initialPos + 1; i < items.length; i++) {
      item = items[i];

      if (breakCondition(item)) {
        break;
      } else {
        if (visibleItemsLookup[item.id] === undefined) {
          visibleItemsLookup[item.id] = true;
          visibleItems.push(item);
        }
      }
    }
  }
};
/**
 * this function is very similar to the _checkIfInvisible() but it does not
 * return booleans, hides the item if it should not be seen and always adds to
 * the visibleItems.
 * this one is for brute forcing and hiding.
 *
 * @param {Item} item
 * @param {Array} visibleItems
 * @param {{start:number, end:number}} range
 * @private
 */


Group.prototype._checkIfVisible = function (item, visibleItems, range) {
  if (item.isVisible(range)) {
    if (!item.displayed) item.show(); // reposition item horizontally

    item.repositionX();
    visibleItems.push(item);
  } else {
    if (item.displayed) item.hide();
  }
};
/**
 * this function is very similar to the _checkIfInvisible() but it does not
 * return booleans, hides the item if it should not be seen and always adds to
 * the visibleItems.
 * this one is for brute forcing and hiding.
 *
 * @param {Item} item
 * @param {Array.<vis.Item>} visibleItems
 * @param {Object<number, boolean>} visibleItemsLookup
 * @param {{start:number, end:number}} range
 * @private
 */


Group.prototype._checkIfVisibleWithReference = function (item, visibleItems, visibleItemsLookup, range) {
  if (item.isVisible(range)) {
    if (visibleItemsLookup[item.id] === undefined) {
      visibleItemsLookup[item.id] = true;
      visibleItems.push(item);
    }
  } else {
    if (item.displayed) item.hide();
  }
};

Group.prototype.changeSubgroup = function (item, oldSubgroup, newSubgroup) {
  this._removeFromSubgroup(item, oldSubgroup);

  this._addToSubgroup(item, newSubgroup);

  this.orderSubgroups();
};

var Group_1 = Group;

/**
 * @constructor BackgroundGroup
 * @param {number | string} groupId
 * @param {Object} data
 * @param {ItemSet} itemSet
 * @extends Group
 */

function BackgroundGroup(groupId, data, itemSet) {
  Group_1.call(this, groupId, data, itemSet);
  this.width = 0;
  this.height = 0;
  this.top = 0;
  this.left = 0;
}

BackgroundGroup.prototype = Object.create(Group_1.prototype);
/**
 * Repaint this group
 * @param {{start: number, end: number}} range
 * @param {{item: {horizontal: number, vertical: number}, axis: number}} margin
 * @param {boolean} [forceRestack=false]  Force restacking of all items
 * @return {boolean} Returns true if the group is resized
 */

BackgroundGroup.prototype.redraw = function (range, margin, forceRestack) {
  // eslint-disable-line no-unused-vars
  var resized = false;
  this.visibleItems = this._updateItemsInRange(this.orderedItems, this.visibleItems, range); // calculate actual size

  this.width = this.dom.background.offsetWidth; // apply new height (just always zero for BackgroundGroup

  this.dom.background.style.height = '0'; // update vertical position of items after they are re-stacked and the height of the group is calculated

  for (var i = 0, ii = this.visibleItems.length; i < ii; i++) {
    var item = this.visibleItems[i];
    item.repositionY(margin);
  }

  return resized;
};
/**
 * Show this group: attach to the DOM
 */


BackgroundGroup.prototype.show = function () {
  if (!this.dom.background.parentNode) {
    this.itemSet.dom.background.appendChild(this.dom.background);
  }
};

var BackgroundGroup_1 = BackgroundGroup;

/**
 * @constructor Item
 * @param {Object} data             Object containing (optional) parameters type,
 *                                  start, end, content, group, className.
 * @param {{toScreen: function, toTime: function}} conversion
 *                                  Conversion functions from time to screen and vice versa
 * @param {Object} options          Configuration options
 *                                  // TODO: describe available options
 */

function Item(data, conversion, options) {
  this.id = null;
  this.parent = null;
  this.data = data;
  this.dom = null;
  this.conversion = conversion || {};
  this.options = options || {};
  this.selected = false;
  this.displayed = false;
  this.groupShowing = true;
  this.dirty = true;
  this.top = null;
  this.right = null;
  this.left = null;
  this.width = null;
  this.height = null;
  this.editable = null;

  this._updateEditStatus();
}

Item.prototype.stack = true;
/**
 * Select current item
 */

Item.prototype.select = function () {
  this.selected = true;
  this.dirty = true;
  if (this.displayed) this.redraw();
};
/**
 * Unselect current item
 */


Item.prototype.unselect = function () {
  this.selected = false;
  this.dirty = true;
  if (this.displayed) this.redraw();
};
/**
 * Set data for the item. Existing data will be updated. The id should not
 * be changed. When the item is displayed, it will be redrawn immediately.
 * @param {Object} data
 */


Item.prototype.setData = function (data) {
  var groupChanged = data.group != undefined && this.data.group != data.group;

  if (groupChanged && this.parent != null) {
    this.parent.itemSet._moveToGroup(this, data.group);
  }

  if (this.parent) {
    this.parent.stackDirty = true;
  }

  var subGroupChanged = data.subgroup != undefined && this.data.subgroup != data.subgroup;

  if (subGroupChanged && this.parent != null) {
    this.parent.changeSubgroup(this, this.data.subgroup, data.subgroup);
  }

  this.data = data;

  this._updateEditStatus();

  this.dirty = true;
  if (this.displayed) this.redraw();
};
/**
 * Set a parent for the item
 * @param {Group} parent
 */


Item.prototype.setParent = function (parent) {
  if (this.displayed) {
    this.hide();
    this.parent = parent;

    if (this.parent) {
      this.show();
    }
  } else {
    this.parent = parent;
  }
};
/**
 * Check whether this item is visible inside given range
 * @param {vis.Range} range with a timestamp for start and end
 * @returns {boolean} True if visible
 */


Item.prototype.isVisible = function (range) {
  // eslint-disable-line no-unused-vars
  return false;
};
/**
 * Show the Item in the DOM (when not already visible)
 * @return {Boolean} changed
 */


Item.prototype.show = function () {
  return false;
};
/**
 * Hide the Item from the DOM (when visible)
 * @return {Boolean} changed
 */


Item.prototype.hide = function () {
  return false;
};
/**
 * Repaint the item
 */


Item.prototype.redraw = function () {// should be implemented by the item
};
/**
 * Reposition the Item horizontally
 */


Item.prototype.repositionX = function () {// should be implemented by the item
};
/**
 * Reposition the Item vertically
 */


Item.prototype.repositionY = function () {// should be implemented by the item
};
/**
 * Repaint a drag area on the center of the item when the item is selected
 * @protected
 */


Item.prototype._repaintDragCenter = function () {
  if (this.selected && this.options.editable.updateTime && !this.dom.dragCenter) {
    var me = this; // create and show drag area

    var dragCenter = document.createElement('div');
    dragCenter.className = 'vis-drag-center';
    dragCenter.dragCenterItem = this;
    var hammer = new hammer$1(dragCenter);
    hammer.on('tap', function (event) {
      me.parent.itemSet.body.emitter.emit('click', {
        event: event,
        item: me.id
      });
    });
    hammer.on('doubletap', function (event) {
      event.stopPropagation();

      me.parent.itemSet._onUpdateItem(me);

      me.parent.itemSet.body.emitter.emit('doubleClick', {
        event: event,
        item: me.id
      });
    });

    if (this.dom.box) {
      if (this.dom.dragLeft) {
        this.dom.box.insertBefore(dragCenter, this.dom.dragLeft);
      } else {
        this.dom.box.appendChild(dragCenter);
      }
    } else if (this.dom.point) {
      this.dom.point.appendChild(dragCenter);
    }

    this.dom.dragCenter = dragCenter;
  } else if (!this.selected && this.dom.dragCenter) {
    // delete drag area
    if (this.dom.dragCenter.parentNode) {
      this.dom.dragCenter.parentNode.removeChild(this.dom.dragCenter);
    }

    this.dom.dragCenter = null;
  }
};
/**
 * Repaint a delete button on the top right of the item when the item is selected
 * @param {HTMLElement} anchor
 * @protected
 */


Item.prototype._repaintDeleteButton = function (anchor) {
  var editable = (this.options.editable.overrideItems || this.editable == null) && this.options.editable.remove || !this.options.editable.overrideItems && this.editable != null && this.editable.remove;

  if (this.selected && editable && !this.dom.deleteButton) {
    // create and show button
    var me = this;
    var deleteButton = document.createElement('div');

    if (this.options.rtl) {
      deleteButton.className = 'vis-delete-rtl';
    } else {
      deleteButton.className = 'vis-delete';
    }

    deleteButton.title = 'Delete this item'; // TODO: be able to destroy the delete button

    new hammer$1(deleteButton).on('tap', function (event) {
      event.stopPropagation();
      me.parent.removeFromDataSet(me);
    });
    anchor.appendChild(deleteButton);
    this.dom.deleteButton = deleteButton;
  } else if (!this.selected && this.dom.deleteButton) {
    // remove button
    if (this.dom.deleteButton.parentNode) {
      this.dom.deleteButton.parentNode.removeChild(this.dom.deleteButton);
    }

    this.dom.deleteButton = null;
  }
};
/**
 * Repaint a onChange tooltip on the top right of the item when the item is selected
 * @param {HTMLElement} anchor
 * @protected
 */


Item.prototype._repaintOnItemUpdateTimeTooltip = function (anchor) {
  if (!this.options.tooltipOnItemUpdateTime) return;
  var editable = (this.options.editable.updateTime || this.data.editable === true) && this.data.editable !== false;

  if (this.selected && editable && !this.dom.onItemUpdateTimeTooltip) {
    var onItemUpdateTimeTooltip = document.createElement('div');
    onItemUpdateTimeTooltip.className = 'vis-onUpdateTime-tooltip';
    anchor.appendChild(onItemUpdateTimeTooltip);
    this.dom.onItemUpdateTimeTooltip = onItemUpdateTimeTooltip;
  } else if (!this.selected && this.dom.onItemUpdateTimeTooltip) {
    // remove button
    if (this.dom.onItemUpdateTimeTooltip.parentNode) {
      this.dom.onItemUpdateTimeTooltip.parentNode.removeChild(this.dom.onItemUpdateTimeTooltip);
    }

    this.dom.onItemUpdateTimeTooltip = null;
  } // position onChange tooltip


  if (this.dom.onItemUpdateTimeTooltip) {
    // only show when editing
    this.dom.onItemUpdateTimeTooltip.style.visibility = this.parent.itemSet.touchParams.itemIsDragging ? 'visible' : 'hidden'; // position relative to item's content

    if (this.options.rtl) {
      this.dom.onItemUpdateTimeTooltip.style.right = this.dom.content.style.right;
    } else {
      this.dom.onItemUpdateTimeTooltip.style.left = this.dom.content.style.left;
    } // position above or below the item depending on the item's position in the window


    var tooltipOffset = 50; // TODO: should be tooltip height (depends on template)

    var scrollTop = this.parent.itemSet.body.domProps.scrollTop; // TODO: this.top for orientation:true is actually the items distance from the bottom... 
    // (should be this.bottom)

    var itemDistanceFromTop;

    if (this.options.orientation.item == 'top') {
      itemDistanceFromTop = this.top;
    } else {
      itemDistanceFromTop = this.parent.height - this.top - this.height;
    }

    var isCloseToTop = itemDistanceFromTop + this.parent.top - tooltipOffset < -scrollTop;

    if (isCloseToTop) {
      this.dom.onItemUpdateTimeTooltip.style.bottom = "";
      this.dom.onItemUpdateTimeTooltip.style.top = this.height + 2 + "px";
    } else {
      this.dom.onItemUpdateTimeTooltip.style.top = "";
      this.dom.onItemUpdateTimeTooltip.style.bottom = this.height + 2 + "px";
    } // handle tooltip content


    var content;
    var templateFunction;

    if (this.options.tooltipOnItemUpdateTime && this.options.tooltipOnItemUpdateTime.template) {
      templateFunction = this.options.tooltipOnItemUpdateTime.template.bind(this);
      content = templateFunction(this.data);
    } else {
      content = 'start: ' + moment$3(this.data.start).format('MM/DD/YYYY hh:mm');

      if (this.data.end) {
        content += '<br> end: ' + moment$3(this.data.end).format('MM/DD/YYYY hh:mm');
      }
    }

    this.dom.onItemUpdateTimeTooltip.innerHTML = content;
  }
};
/**
 * Set HTML contents for the item
 * @param {Element} element   HTML element to fill with the contents
 * @private
 */


Item.prototype._updateContents = function (element) {
  var content;
  var changed;
  var templateFunction;
  var itemVisibleFrameContent;
  var visibleFrameTemplateFunction;
  var itemData = this.parent.itemSet.itemsData.get(this.id); // get a clone of the data from the dataset

  var frameElement = this.dom.box || this.dom.point;
  var itemVisibleFrameContentElement = frameElement.getElementsByClassName('vis-item-visible-frame')[0];

  if (this.options.visibleFrameTemplate) {
    visibleFrameTemplateFunction = this.options.visibleFrameTemplate.bind(this);
    itemVisibleFrameContent = visibleFrameTemplateFunction(itemData, frameElement);
  } else {
    itemVisibleFrameContent = '';
  }

  if (itemVisibleFrameContentElement) {
    if (itemVisibleFrameContent instanceof Object && !(itemVisibleFrameContent instanceof Element)) {
      visibleFrameTemplateFunction(itemData, itemVisibleFrameContentElement);
    } else {
      changed = this._contentToString(this.itemVisibleFrameContent) !== this._contentToString(itemVisibleFrameContent);

      if (changed) {
        // only replace the content when changed
        if (itemVisibleFrameContent instanceof Element) {
          itemVisibleFrameContentElement.innerHTML = '';
          itemVisibleFrameContentElement.appendChild(itemVisibleFrameContent);
        } else if (itemVisibleFrameContent != undefined) {
          itemVisibleFrameContentElement.innerHTML = itemVisibleFrameContent;
        } else {
          if (!(this.data.type == 'background' && this.data.content === undefined)) {
            throw new Error('Property "content" missing in item ' + this.id);
          }
        }

        this.itemVisibleFrameContent = itemVisibleFrameContent;
      }
    }
  }

  if (this.options.template) {
    templateFunction = this.options.template.bind(this);
    content = templateFunction(itemData, element, this.data);
  } else {
    content = this.data.content;
  }

  if (content instanceof Object && !(content instanceof Element)) {
    templateFunction(itemData, element);
  } else {
    changed = this._contentToString(this.content) !== this._contentToString(content);

    if (changed) {
      // only replace the content when changed
      if (content instanceof Element) {
        element.innerHTML = '';
        element.appendChild(content);
      } else if (content != undefined) {
        element.innerHTML = content;
      } else {
        if (!(this.data.type == 'background' && this.data.content === undefined)) {
          throw new Error('Property "content" missing in item ' + this.id);
        }
      }

      this.content = content;
    }
  }
};
/**
 * Process dataAttributes timeline option and set as data- attributes on dom.content
 * @param {Element} element   HTML element to which the attributes will be attached
 * @private
 */


Item.prototype._updateDataAttributes = function (element) {
  if (this.options.dataAttributes && this.options.dataAttributes.length > 0) {
    var attributes = [];

    if (Array.isArray(this.options.dataAttributes)) {
      attributes = this.options.dataAttributes;
    } else if (this.options.dataAttributes == 'all') {
      attributes = Object.keys(this.data);
    } else {
      return;
    }

    for (var i = 0; i < attributes.length; i++) {
      var name = attributes[i];
      var value = this.data[name];

      if (value != null) {
        element.setAttribute('data-' + name, value);
      } else {
        element.removeAttribute('data-' + name);
      }
    }
  }
};
/**
 * Update custom styles of the element
 * @param {Element} element
 * @private
 */


Item.prototype._updateStyle = function (element) {
  // remove old styles
  if (this.style) {
    util.removeCssText(element, this.style);
    this.style = null;
  } // append new styles


  if (this.data.style) {
    util.addCssText(element, this.data.style);
    this.style = this.data.style;
  }
};
/**
 * Stringify the items contents
 * @param {string | Element | undefined} content
 * @returns {string | undefined}
 * @private
 */


Item.prototype._contentToString = function (content) {
  if (typeof content === 'string') return content;
  if (content && 'outerHTML' in content) return content.outerHTML;
  return content;
};
/**
 * Update the editability of this item.
 */


Item.prototype._updateEditStatus = function () {
  if (this.options) {
    if (typeof this.options.editable === 'boolean') {
      this.editable = {
        updateTime: this.options.editable,
        updateGroup: this.options.editable,
        remove: this.options.editable
      };
    } else if (_typeof$1(this.options.editable) === 'object') {
      this.editable = {};
      util.selectiveExtend(['updateTime', 'updateGroup', 'remove'], this.editable, this.options.editable);
    }
  } // Item data overrides, except if options.editable.overrideItems is set.


  if (!this.options || !this.options.editable || this.options.editable.overrideItems !== true) {
    if (this.data) {
      if (typeof this.data.editable === 'boolean') {
        this.editable = {
          updateTime: this.data.editable,
          updateGroup: this.data.editable,
          remove: this.data.editable
        };
      } else if (_typeof$1(this.data.editable) === 'object') {
        // TODO: in vis.js 5.0, we should change this to not reset options from the timeline configuration.
        // Basically just remove the next line...
        this.editable = {};
        util.selectiveExtend(['updateTime', 'updateGroup', 'remove'], this.editable, this.data.editable);
      }
    }
  }
};
/**
 * Return the width of the item left from its start date
 * @return {number}
 */


Item.prototype.getWidthLeft = function () {
  return 0;
};
/**
 * Return the width of the item right from the max of its start and end date
 * @return {number}
 */


Item.prototype.getWidthRight = function () {
  return 0;
};
/**
 * Return the title of the item
 * @return {string | undefined}
 */


Item.prototype.getTitle = function () {
  return this.data.title;
};

/**
 * @constructor BoxItem
 * @extends Item
 * @param {Object} data             Object containing parameters start
 *                                  content, className.
 * @param {{toScreen: function, toTime: function}} conversion
 *                                  Conversion functions from time to screen and vice versa
 * @param {Object} [options]        Configuration options
 *                                  // TODO: describe available options
 */

function BoxItem(data, conversion, options) {
  this.props = {
    dot: {
      width: 0,
      height: 0
    },
    line: {
      width: 0,
      height: 0
    }
  };
  this.options = options; // validate data

  if (data) {
    if (data.start == undefined) {
      throw new Error('Property "start" missing in item ' + data);
    }
  }

  Item.call(this, data, conversion, options);
}

BoxItem.prototype = new Item(null, null, null);
/**
 * Check whether this item is visible inside given range
 * @param {{start: number, end: number}} range with a timestamp for start and end
 * @returns {boolean} True if visible
 */

BoxItem.prototype.isVisible = function (range) {
  // determine visibility
  var isVisible;
  var align = this.options.align;
  var widthInMs = this.width * range.getMillisecondsPerPixel();

  if (align == 'right') {
    isVisible = this.data.start.getTime() > range.start && this.data.start.getTime() - widthInMs < range.end;
  } else if (align == 'left') {
    isVisible = this.data.start.getTime() + widthInMs > range.start && this.data.start.getTime() < range.end;
  } else {
    // default or 'center'
    isVisible = this.data.start.getTime() + widthInMs / 2 > range.start && this.data.start.getTime() - widthInMs / 2 < range.end;
  }

  return isVisible;
};

BoxItem.prototype._createDomElement = function () {
  if (!this.dom) {
    // create DOM
    this.dom = {}; // create main box

    this.dom.box = document.createElement('DIV'); // contents box (inside the background box). used for making margins

    this.dom.content = document.createElement('DIV');
    this.dom.content.className = 'vis-item-content';
    this.dom.box.appendChild(this.dom.content); // line to axis

    this.dom.line = document.createElement('DIV');
    this.dom.line.className = 'vis-line'; // dot on axis

    this.dom.dot = document.createElement('DIV');
    this.dom.dot.className = 'vis-dot'; // attach this item as attribute

    this.dom.box['timeline-item'] = this;
    this.dirty = true;
  }
};

BoxItem.prototype._appendDomElement = function () {
  if (!this.parent) {
    throw new Error('Cannot redraw item: no parent attached');
  }

  if (!this.dom.box.parentNode) {
    var foreground = this.parent.dom.foreground;
    if (!foreground) throw new Error('Cannot redraw item: parent has no foreground container element');
    foreground.appendChild(this.dom.box);
  }

  if (!this.dom.line.parentNode) {
    var background = this.parent.dom.background;
    if (!background) throw new Error('Cannot redraw item: parent has no background container element');
    background.appendChild(this.dom.line);
  }

  if (!this.dom.dot.parentNode) {
    var axis = this.parent.dom.axis;
    if (!background) throw new Error('Cannot redraw item: parent has no axis container element');
    axis.appendChild(this.dom.dot);
  }

  this.displayed = true;
};

BoxItem.prototype._updateDirtyDomComponents = function () {
  // An item is marked dirty when:
  // - the item is not yet rendered
  // - the item's data is changed
  // - the item is selected/deselected
  if (this.dirty) {
    this._updateContents(this.dom.content);

    this._updateDataAttributes(this.dom.box);

    this._updateStyle(this.dom.box);

    var editable = this.editable.updateTime || this.editable.updateGroup; // update class

    var className = (this.data.className ? ' ' + this.data.className : '') + (this.selected ? ' vis-selected' : '') + (editable ? ' vis-editable' : ' vis-readonly');
    this.dom.box.className = 'vis-item vis-box' + className;
    this.dom.line.className = 'vis-item vis-line' + className;
    this.dom.dot.className = 'vis-item vis-dot' + className;
  }
};

BoxItem.prototype._getDomComponentsSizes = function () {
  return {
    previous: {
      right: this.dom.box.style.right,
      left: this.dom.box.style.left
    },
    dot: {
      height: this.dom.dot.offsetHeight,
      width: this.dom.dot.offsetWidth
    },
    line: {
      width: this.dom.line.offsetWidth
    },
    box: {
      width: this.dom.box.offsetWidth,
      height: this.dom.box.offsetHeight
    }
  };
};

BoxItem.prototype._updateDomComponentsSizes = function (sizes) {
  if (this.options.rtl) {
    this.dom.box.style.right = "0px";
  } else {
    this.dom.box.style.left = "0px";
  } // recalculate size


  this.props.dot.height = sizes.dot.height;
  this.props.dot.width = sizes.dot.width;
  this.props.line.width = sizes.line.width;
  this.width = sizes.box.width;
  this.height = sizes.box.height; // restore previous position

  if (this.options.rtl) {
    this.dom.box.style.right = sizes.previous.right;
  } else {
    this.dom.box.style.left = sizes.previous.left;
  }

  this.dirty = false;
};

BoxItem.prototype._repaintDomAdditionals = function () {
  this._repaintOnItemUpdateTimeTooltip(this.dom.box);

  this._repaintDragCenter();

  this._repaintDeleteButton(this.dom.box);
};
/**
 * Repaint the item
 * @param {boolean} [returnQueue=false]  return the queue
 * @return {boolean} the redraw queue if returnQueue=true
 */


BoxItem.prototype.redraw = function (returnQueue) {
  var sizes;
  var queue = [// create item DOM
  this._createDomElement.bind(this), // append DOM to parent DOM
  this._appendDomElement.bind(this), // update dirty DOM
  this._updateDirtyDomComponents.bind(this), function () {
    if (this.dirty) {
      sizes = this._getDomComponentsSizes();
    }
  }.bind(this), function () {
    if (this.dirty) {
      this._updateDomComponentsSizes.bind(this)(sizes);
    }
  }.bind(this), // repaint DOM additionals
  this._repaintDomAdditionals.bind(this)];

  if (returnQueue) {
    return queue;
  } else {
    var result;
    queue.forEach(function (fn) {
      result = fn();
    });
    return result;
  }
};
/**
 * Show the item in the DOM (when not already visible). The items DOM will
 * be created when needed.
 * @param {boolean} [returnQueue=false]  whether to return a queue of functions to execute instead of just executing them
 * @return {boolean} the redraw queue if returnQueue=true
 */


BoxItem.prototype.show = function (returnQueue) {
  if (!this.displayed) {
    return this.redraw(returnQueue);
  }
};
/**
 * Hide the item from the DOM (when visible)
 */


BoxItem.prototype.hide = function () {
  if (this.displayed) {
    var dom = this.dom;
    if (dom.box.parentNode) dom.box.parentNode.removeChild(dom.box);
    if (dom.line.parentNode) dom.line.parentNode.removeChild(dom.line);
    if (dom.dot.parentNode) dom.dot.parentNode.removeChild(dom.dot);
    this.displayed = false;
  }
};
/**
 * Reposition the item horizontally
 * @Override
 */


BoxItem.prototype.repositionX = function () {
  var start = this.conversion.toScreen(this.data.start);
  var align = this.options.align; // calculate left position of the box

  if (align == 'right') {
    if (this.options.rtl) {
      this.right = start - this.width; // reposition box, line, and dot

      this.dom.box.style.right = this.right + 'px';
      this.dom.line.style.right = start - this.props.line.width + 'px';
      this.dom.dot.style.right = start - this.props.line.width / 2 - this.props.dot.width / 2 + 'px';
    } else {
      this.left = start - this.width; // reposition box, line, and dot

      this.dom.box.style.left = this.left + 'px';
      this.dom.line.style.left = start - this.props.line.width + 'px';
      this.dom.dot.style.left = start - this.props.line.width / 2 - this.props.dot.width / 2 + 'px';
    }
  } else if (align == 'left') {
    if (this.options.rtl) {
      this.right = start; // reposition box, line, and dot

      this.dom.box.style.right = this.right + 'px';
      this.dom.line.style.right = start + 'px';
      this.dom.dot.style.right = start + this.props.line.width / 2 - this.props.dot.width / 2 + 'px';
    } else {
      this.left = start; // reposition box, line, and dot

      this.dom.box.style.left = this.left + 'px';
      this.dom.line.style.left = start + 'px';
      this.dom.dot.style.left = start + this.props.line.width / 2 - this.props.dot.width / 2 + 'px';
    }
  } else {
    // default or 'center'
    if (this.options.rtl) {
      this.right = start - this.width / 2; // reposition box, line, and dot

      this.dom.box.style.right = this.right + 'px';
      this.dom.line.style.right = start - this.props.line.width + 'px';
      this.dom.dot.style.right = start - this.props.dot.width / 2 + 'px';
    } else {
      this.left = start - this.width / 2; // reposition box, line, and dot

      this.dom.box.style.left = this.left + 'px';
      this.dom.line.style.left = start - this.props.line.width / 2 + 'px';
      this.dom.dot.style.left = start - this.props.dot.width / 2 + 'px';
    }
  }
};
/**
 * Reposition the item vertically
 * @Override
 */


BoxItem.prototype.repositionY = function () {
  var orientation = this.options.orientation.item;
  var box = this.dom.box;
  var line = this.dom.line;
  var dot = this.dom.dot;

  if (orientation == 'top') {
    box.style.top = (this.top || 0) + 'px';
    line.style.top = '0';
    line.style.height = this.parent.top + this.top + 1 + 'px';
    line.style.bottom = '';
  } else {
    // orientation 'bottom'
    var itemSetHeight = this.parent.itemSet.props.height; // TODO: this is nasty

    var lineHeight = itemSetHeight - this.parent.top - this.parent.height + this.top;
    box.style.top = (this.parent.height - this.top - this.height || 0) + 'px';
    line.style.top = itemSetHeight - lineHeight + 'px';
    line.style.bottom = '0';
  }

  dot.style.top = -this.props.dot.height / 2 + 'px';
};
/**
 * Return the width of the item left from its start date
 * @return {number}
 */


BoxItem.prototype.getWidthLeft = function () {
  return this.width / 2;
};
/**
 * Return the width of the item right from its start date
 * @return {number}
 */


BoxItem.prototype.getWidthRight = function () {
  return this.width / 2;
};

var BoxItem_1 = BoxItem;

/**
 * @constructor PointItem
 * @extends Item
 * @param {Object} data             Object containing parameters start
 *                                  content, className.
 * @param {{toScreen: function, toTime: function}} conversion
 *                                  Conversion functions from time to screen and vice versa
 * @param {Object} [options]        Configuration options
 *                                  // TODO: describe available options
 */

function PointItem(data, conversion, options) {
  this.props = {
    dot: {
      top: 0,
      width: 0,
      height: 0
    },
    content: {
      height: 0,
      marginLeft: 0,
      marginRight: 0
    }
  };
  this.options = options; // validate data

  if (data) {
    if (data.start == undefined) {
      throw new Error('Property "start" missing in item ' + data);
    }
  }

  Item.call(this, data, conversion, options);
}

PointItem.prototype = new Item(null, null, null);
/**
 * Check whether this item is visible inside given range
 * @param {{start: number, end: number}} range with a timestamp for start and end
 * @returns {boolean} True if visible
 */

PointItem.prototype.isVisible = function (range) {
  // determine visibility
  var widthInMs = this.width * range.getMillisecondsPerPixel();
  return this.data.start.getTime() + widthInMs > range.start && this.data.start < range.end;
};

PointItem.prototype._createDomElement = function () {
  if (!this.dom) {
    // create DOM
    this.dom = {}; // background box

    this.dom.point = document.createElement('div'); // className is updated in redraw()
    // contents box, right from the dot

    this.dom.content = document.createElement('div');
    this.dom.content.className = 'vis-item-content';
    this.dom.point.appendChild(this.dom.content); // dot at start

    this.dom.dot = document.createElement('div');
    this.dom.point.appendChild(this.dom.dot); // attach this item as attribute

    this.dom.point['timeline-item'] = this;
    this.dirty = true;
  }
};

PointItem.prototype._appendDomElement = function () {
  if (!this.parent) {
    throw new Error('Cannot redraw item: no parent attached');
  }

  if (!this.dom.point.parentNode) {
    var foreground = this.parent.dom.foreground;

    if (!foreground) {
      throw new Error('Cannot redraw item: parent has no foreground container element');
    }

    foreground.appendChild(this.dom.point);
  }

  this.displayed = true;
};

PointItem.prototype._updateDirtyDomComponents = function () {
  // An item is marked dirty when:
  // - the item is not yet rendered
  // - the item's data is changed
  // - the item is selected/deselected
  if (this.dirty) {
    this._updateContents(this.dom.content);

    this._updateDataAttributes(this.dom.point);

    this._updateStyle(this.dom.point);

    var editable = this.editable.updateTime || this.editable.updateGroup; // update class

    var className = (this.data.className ? ' ' + this.data.className : '') + (this.selected ? ' vis-selected' : '') + (editable ? ' vis-editable' : ' vis-readonly');
    this.dom.point.className = 'vis-item vis-point' + className;
    this.dom.dot.className = 'vis-item vis-dot' + className;
  }
};

PointItem.prototype._getDomComponentsSizes = function () {
  return {
    dot: {
      width: this.dom.dot.offsetWidth,
      height: this.dom.dot.offsetHeight
    },
    content: {
      width: this.dom.content.offsetWidth,
      height: this.dom.content.offsetHeight
    },
    point: {
      width: this.dom.point.offsetWidth,
      height: this.dom.point.offsetHeight
    }
  };
};

PointItem.prototype._updateDomComponentsSizes = function (sizes) {
  // recalculate size of dot and contents
  this.props.dot.width = sizes.dot.width;
  this.props.dot.height = sizes.dot.height;
  this.props.content.height = sizes.content.height; // resize contents

  if (this.options.rtl) {
    this.dom.content.style.marginRight = 2 * this.props.dot.width + 'px';
  } else {
    this.dom.content.style.marginLeft = 2 * this.props.dot.width + 'px';
  } //this.dom.content.style.marginRight = ... + 'px'; // TODO: margin right
  // recalculate size


  this.width = sizes.point.width;
  this.height = sizes.point.height; // reposition the dot

  this.dom.dot.style.top = (this.height - this.props.dot.height) / 2 + 'px';

  if (this.options.rtl) {
    this.dom.dot.style.right = this.props.dot.width / 2 + 'px';
  } else {
    this.dom.dot.style.left = this.props.dot.width / 2 + 'px';
  }

  this.dirty = false;
};

PointItem.prototype._repaintDomAdditionals = function () {
  this._repaintOnItemUpdateTimeTooltip(this.dom.point);

  this._repaintDragCenter();

  this._repaintDeleteButton(this.dom.point);
};
/**
 * Repaint the item
 * @param {boolean} [returnQueue=false]  return the queue
 * @return {boolean} the redraw queue if returnQueue=true
 */


PointItem.prototype.redraw = function (returnQueue) {
  var sizes;
  var queue = [// create item DOM
  this._createDomElement.bind(this), // append DOM to parent DOM
  this._appendDomElement.bind(this), // update dirty DOM
  this._updateDirtyDomComponents.bind(this), function () {
    if (this.dirty) {
      sizes = this._getDomComponentsSizes();
    }
  }.bind(this), function () {
    if (this.dirty) {
      this._updateDomComponentsSizes.bind(this)(sizes);
    }
  }.bind(this), // repaint DOM additionals
  this._repaintDomAdditionals.bind(this)];

  if (returnQueue) {
    return queue;
  } else {
    var result;
    queue.forEach(function (fn) {
      result = fn();
    });
    return result;
  }
};
/**
 * Show the item in the DOM (when not already visible). The items DOM will
 * be created when needed.
 * @param {boolean} [returnQueue=false]  whether to return a queue of functions to execute instead of just executing them
 * @return {boolean} the redraw queue if returnQueue=true
 */


PointItem.prototype.show = function (returnQueue) {
  if (!this.displayed) {
    return this.redraw(returnQueue);
  }
};
/**
 * Hide the item from the DOM (when visible)
 */


PointItem.prototype.hide = function () {
  if (this.displayed) {
    if (this.dom.point.parentNode) {
      this.dom.point.parentNode.removeChild(this.dom.point);
    }

    this.displayed = false;
  }
};
/**
 * Reposition the item horizontally
 * @Override
 */


PointItem.prototype.repositionX = function () {
  var start = this.conversion.toScreen(this.data.start);

  if (this.options.rtl) {
    this.right = start - this.props.dot.width; // reposition point

    this.dom.point.style.right = this.right + 'px';
  } else {
    this.left = start - this.props.dot.width; // reposition point

    this.dom.point.style.left = this.left + 'px';
  }
};
/**
 * Reposition the item vertically
 * @Override
 */


PointItem.prototype.repositionY = function () {
  var orientation = this.options.orientation.item;
  var point = this.dom.point;

  if (orientation == 'top') {
    point.style.top = this.top + 'px';
  } else {
    point.style.top = this.parent.height - this.top - this.height + 'px';
  }
};
/**
 * Return the width of the item left from its start date
 * @return {number}
 */


PointItem.prototype.getWidthLeft = function () {
  return this.props.dot.width;
};
/**
 * Return the width of the item right from  its start date
 * @return {number}
 */


PointItem.prototype.getWidthRight = function () {
  return this.props.dot.width;
};

var PointItem_1 = PointItem;

/**
 * @constructor RangeItem
 * @extends Item
 * @param {Object} data             Object containing parameters start, end
 *                                  content, className.
 * @param {{toScreen: function, toTime: function}} conversion
 *                                  Conversion functions from time to screen and vice versa
 * @param {Object} [options]        Configuration options
 *                                  // TODO: describe options
 */

function RangeItem(data, conversion, options) {
  this.props = {
    content: {
      width: 0
    }
  };
  this.overflow = false; // if contents can overflow (css styling), this flag is set to true

  this.options = options; // validate data

  if (data) {
    if (data.start == undefined) {
      throw new Error('Property "start" missing in item ' + data.id);
    }

    if (data.end == undefined) {
      throw new Error('Property "end" missing in item ' + data.id);
    }
  }

  Item.call(this, data, conversion, options);
}

RangeItem.prototype = new Item(null, null, null);
RangeItem.prototype.baseClassName = 'vis-item vis-range';
/**
 * Check whether this item is visible inside given range
 *
 * @param {vis.Range} range with a timestamp for start and end
 * @returns {boolean} True if visible
 */

RangeItem.prototype.isVisible = function (range) {
  // determine visibility
  return this.data.start < range.end && this.data.end > range.start;
};

RangeItem.prototype._createDomElement = function () {
  if (!this.dom) {
    // create DOM
    this.dom = {}; // background box

    this.dom.box = document.createElement('div'); // className is updated in redraw()
    // frame box (to prevent the item contents from overflowing)

    this.dom.frame = document.createElement('div');
    this.dom.frame.className = 'vis-item-overflow';
    this.dom.box.appendChild(this.dom.frame); // visible frame box (showing the frame that is always visible)

    this.dom.visibleFrame = document.createElement('div');
    this.dom.visibleFrame.className = 'vis-item-visible-frame';
    this.dom.box.appendChild(this.dom.visibleFrame); // contents box

    this.dom.content = document.createElement('div');
    this.dom.content.className = 'vis-item-content';
    this.dom.frame.appendChild(this.dom.content); // attach this item as attribute

    this.dom.box['timeline-item'] = this;
    this.dirty = true;
  }
};

RangeItem.prototype._appendDomElement = function () {
  if (!this.parent) {
    throw new Error('Cannot redraw item: no parent attached');
  }

  if (!this.dom.box.parentNode) {
    var foreground = this.parent.dom.foreground;

    if (!foreground) {
      throw new Error('Cannot redraw item: parent has no foreground container element');
    }

    foreground.appendChild(this.dom.box);
  }

  this.displayed = true;
};

RangeItem.prototype._updateDirtyDomComponents = function () {
  // update dirty DOM. An item is marked dirty when:
  // - the item is not yet rendered
  // - the item's data is changed
  // - the item is selected/deselected
  if (this.dirty) {
    this._updateContents(this.dom.content);

    this._updateDataAttributes(this.dom.box);

    this._updateStyle(this.dom.box);

    var editable = this.editable.updateTime || this.editable.updateGroup; // update class

    var className = (this.data.className ? ' ' + this.data.className : '') + (this.selected ? ' vis-selected' : '') + (editable ? ' vis-editable' : ' vis-readonly');
    this.dom.box.className = this.baseClassName + className; // turn off max-width to be able to calculate the real width
    // this causes an extra browser repaint/reflow, but so be it

    this.dom.content.style.maxWidth = 'none';
  }
};

RangeItem.prototype._getDomComponentsSizes = function () {
  // determine from css whether this box has overflow
  this.overflow = window.getComputedStyle(this.dom.frame).overflow !== 'hidden';
  return {
    content: {
      width: this.dom.content.offsetWidth
    },
    box: {
      height: this.dom.box.offsetHeight
    }
  };
};

RangeItem.prototype._updateDomComponentsSizes = function (sizes) {
  this.props.content.width = sizes.content.width;
  this.height = sizes.box.height;
  this.dom.content.style.maxWidth = '';
  this.dirty = false;
};

RangeItem.prototype._repaintDomAdditionals = function () {
  this._repaintOnItemUpdateTimeTooltip(this.dom.box);

  this._repaintDeleteButton(this.dom.box);

  this._repaintDragCenter();

  this._repaintDragLeft();

  this._repaintDragRight();
};
/**
 * Repaint the item
 * @param {boolean} [returnQueue=false]  return the queue
 * @return {boolean} the redraw queue if returnQueue=true
 */


RangeItem.prototype.redraw = function (returnQueue) {
  var sizes;
  var queue = [// create item DOM
  this._createDomElement.bind(this), // append DOM to parent DOM
  this._appendDomElement.bind(this), // update dirty DOM 
  this._updateDirtyDomComponents.bind(this), function () {
    if (this.dirty) {
      sizes = this._getDomComponentsSizes.bind(this)();
    }
  }.bind(this), function () {
    if (this.dirty) {
      this._updateDomComponentsSizes.bind(this)(sizes);
    }
  }.bind(this), // repaint DOM additionals
  this._repaintDomAdditionals.bind(this)];

  if (returnQueue) {
    return queue;
  } else {
    var result;
    queue.forEach(function (fn) {
      result = fn();
    });
    return result;
  }
};
/**
 * Show the item in the DOM (when not already visible). The items DOM will
 * be created when needed.
 * @param {boolean} [returnQueue=false]  whether to return a queue of functions to execute instead of just executing them
 * @return {boolean} the redraw queue if returnQueue=true
 */


RangeItem.prototype.show = function (returnQueue) {
  if (!this.displayed) {
    return this.redraw(returnQueue);
  }
};
/**
 * Hide the item from the DOM (when visible)
 */


RangeItem.prototype.hide = function () {
  if (this.displayed) {
    var box = this.dom.box;

    if (box.parentNode) {
      box.parentNode.removeChild(box);
    }

    this.displayed = false;
  }
};
/**
 * Reposition the item horizontally
 * @param {boolean} [limitSize=true] If true (default), the width of the range
 *                                   item will be limited, as the browser cannot
 *                                   display very wide divs. This means though
 *                                   that the applied left and width may
 *                                   not correspond to the ranges start and end
 * @Override
 */


RangeItem.prototype.repositionX = function (limitSize) {
  var parentWidth = this.parent.width;
  var start = this.conversion.toScreen(this.data.start);
  var end = this.conversion.toScreen(this.data.end);
  var align = this.data.align === undefined ? this.options.align : this.data.align;
  var contentStartPosition;
  var contentWidth; // limit the width of the range, as browsers cannot draw very wide divs
  // unless limitSize: false is explicitly set in item data

  if (this.data.limitSize !== false && (limitSize === undefined || limitSize === true)) {
    if (start < -parentWidth) {
      start = -parentWidth;
    }

    if (end > 2 * parentWidth) {
      end = 2 * parentWidth;
    }
  } // add 0.5 to compensate floating-point values rounding


  var boxWidth = Math.max(end - start + 0.5, 1);

  if (this.overflow) {
    if (this.options.rtl) {
      this.right = start;
    } else {
      this.left = start;
    }

    this.width = boxWidth + this.props.content.width;
    contentWidth = this.props.content.width; // Note: The calculation of width is an optimistic calculation, giving
    //       a width which will not change when moving the Timeline
    //       So no re-stacking needed, which is nicer for the eye;
  } else {
    if (this.options.rtl) {
      this.right = start;
    } else {
      this.left = start;
    }

    this.width = boxWidth;
    contentWidth = Math.min(end - start, this.props.content.width);
  }

  if (this.options.rtl) {
    this.dom.box.style.right = this.right + 'px';
  } else {
    this.dom.box.style.left = this.left + 'px';
  }

  this.dom.box.style.width = boxWidth + 'px';

  switch (align) {
    case 'left':
      if (this.options.rtl) {
        this.dom.content.style.right = '0';
      } else {
        this.dom.content.style.left = '0';
      }

      break;

    case 'right':
      if (this.options.rtl) {
        this.dom.content.style.right = Math.max(boxWidth - contentWidth, 0) + 'px';
      } else {
        this.dom.content.style.left = Math.max(boxWidth - contentWidth, 0) + 'px';
      }

      break;

    case 'center':
      if (this.options.rtl) {
        this.dom.content.style.right = Math.max((boxWidth - contentWidth) / 2, 0) + 'px';
      } else {
        this.dom.content.style.left = Math.max((boxWidth - contentWidth) / 2, 0) + 'px';
      }

      break;

    default:
      // 'auto'
      // when range exceeds left of the window, position the contents at the left of the visible area
      if (this.overflow) {
        if (end > 0) {
          contentStartPosition = Math.max(-start, 0);
        } else {
          contentStartPosition = -contentWidth; // ensure it's not visible anymore
        }
      } else {
        if (start < 0) {
          contentStartPosition = -start;
        } else {
          contentStartPosition = 0;
        }
      }

      if (this.options.rtl) {
        this.dom.content.style.right = contentStartPosition + 'px';
      } else {
        this.dom.content.style.left = contentStartPosition + 'px';
        this.dom.content.style.width = 'calc(100% - ' + contentStartPosition + 'px)';
      }

  }
};
/**
 * Reposition the item vertically
 * @Override
 */


RangeItem.prototype.repositionY = function () {
  var orientation = this.options.orientation.item;
  var box = this.dom.box;

  if (orientation == 'top') {
    box.style.top = this.top + 'px';
  } else {
    box.style.top = this.parent.height - this.top - this.height + 'px';
  }
};
/**
 * Repaint a drag area on the left side of the range when the range is selected
 * @protected
 */


RangeItem.prototype._repaintDragLeft = function () {
  if ((this.selected || this.options.itemsAlwaysDraggable.range) && this.options.editable.updateTime && !this.dom.dragLeft) {
    // create and show drag area
    var dragLeft = document.createElement('div');
    dragLeft.className = 'vis-drag-left';
    dragLeft.dragLeftItem = this;
    this.dom.box.appendChild(dragLeft);
    this.dom.dragLeft = dragLeft;
  } else if (!this.selected && !this.options.itemsAlwaysDraggable.range && this.dom.dragLeft) {
    // delete drag area
    if (this.dom.dragLeft.parentNode) {
      this.dom.dragLeft.parentNode.removeChild(this.dom.dragLeft);
    }

    this.dom.dragLeft = null;
  }
};
/**
 * Repaint a drag area on the right side of the range when the range is selected
 * @protected
 */


RangeItem.prototype._repaintDragRight = function () {
  if ((this.selected || this.options.itemsAlwaysDraggable.range) && this.options.editable.updateTime && !this.dom.dragRight) {
    // create and show drag area
    var dragRight = document.createElement('div');
    dragRight.className = 'vis-drag-right';
    dragRight.dragRightItem = this;
    this.dom.box.appendChild(dragRight);
    this.dom.dragRight = dragRight;
  } else if (!this.selected && !this.options.itemsAlwaysDraggable.range && this.dom.dragRight) {
    // delete drag area
    if (this.dom.dragRight.parentNode) {
      this.dom.dragRight.parentNode.removeChild(this.dom.dragRight);
    }

    this.dom.dragRight = null;
  }
};

var RangeItem_1 = RangeItem;

/**
 * @constructor BackgroundItem
 * @extends Item
 * @param {Object} data             Object containing parameters start, end
 *                                  content, className.
 * @param {{toScreen: function, toTime: function}} conversion
 *                                  Conversion functions from time to screen and vice versa
 * @param {Object} [options]        Configuration options
 *                                  // TODO: describe options
 * // TODO: implement support for the BackgroundItem just having a start, then being displayed as a sort of an annotation
 */

function BackgroundItem(data, conversion, options) {
  this.props = {
    content: {
      width: 0
    }
  };
  this.overflow = false; // if contents can overflow (css styling), this flag is set to true
  // validate data

  if (data) {
    if (data.start == undefined) {
      throw new Error('Property "start" missing in item ' + data.id);
    }

    if (data.end == undefined) {
      throw new Error('Property "end" missing in item ' + data.id);
    }
  }

  Item.call(this, data, conversion, options);
}

BackgroundItem.prototype = new Item(null, null, null);
BackgroundItem.prototype.baseClassName = 'vis-item vis-background';
BackgroundItem.prototype.stack = false;
/**
 * Check whether this item is visible inside given range
 * @param {vis.Range} range with a timestamp for start and end
 * @returns {boolean} True if visible
 */

BackgroundItem.prototype.isVisible = function (range) {
  // determine visibility
  return this.data.start < range.end && this.data.end > range.start;
};

BackgroundItem.prototype._createDomElement = function () {
  if (!this.dom) {
    // create DOM
    this.dom = {}; // background box

    this.dom.box = document.createElement('div'); // className is updated in redraw()
    // frame box (to prevent the item contents from overflowing

    this.dom.frame = document.createElement('div');
    this.dom.frame.className = 'vis-item-overflow';
    this.dom.box.appendChild(this.dom.frame); // contents box

    this.dom.content = document.createElement('div');
    this.dom.content.className = 'vis-item-content';
    this.dom.frame.appendChild(this.dom.content); // Note: we do NOT attach this item as attribute to the DOM,
    //       such that background items cannot be selected
    //this.dom.box['timeline-item'] = this;

    this.dirty = true;
  }
};

BackgroundItem.prototype._appendDomElement = function () {
  if (!this.parent) {
    throw new Error('Cannot redraw item: no parent attached');
  }

  if (!this.dom.box.parentNode) {
    var background = this.parent.dom.background;

    if (!background) {
      throw new Error('Cannot redraw item: parent has no background container element');
    }

    background.appendChild(this.dom.box);
  }

  this.displayed = true;
};

BackgroundItem.prototype._updateDirtyDomComponents = function () {
  // update dirty DOM. An item is marked dirty when:
  // - the item is not yet rendered
  // - the item's data is changed
  // - the item is selected/deselected
  if (this.dirty) {
    this._updateContents(this.dom.content);

    this._updateDataAttributes(this.dom.content);

    this._updateStyle(this.dom.box); // update class


    var className = (this.data.className ? ' ' + this.data.className : '') + (this.selected ? ' vis-selected' : '');
    this.dom.box.className = this.baseClassName + className;
  }
};

BackgroundItem.prototype._getDomComponentsSizes = function () {
  // determine from css whether this box has overflow
  this.overflow = window.getComputedStyle(this.dom.content).overflow !== 'hidden';
  return {
    content: {
      width: this.dom.content.offsetWidth
    }
  };
};

BackgroundItem.prototype._updateDomComponentsSizes = function (sizes) {
  // recalculate size
  this.props.content.width = sizes.content.width;
  this.height = 0; // set height zero, so this item will be ignored when stacking items

  this.dirty = false;
};

BackgroundItem.prototype._repaintDomAdditionals = function () {};
/**
 * Repaint the item
 * @param {boolean} [returnQueue=false]  return the queue
 * @return {boolean} the redraw result or the redraw queue if returnQueue=true
 */


BackgroundItem.prototype.redraw = function (returnQueue) {
  var sizes;
  var queue = [// create item DOM
  this._createDomElement.bind(this), // append DOM to parent DOM
  this._appendDomElement.bind(this), this._updateDirtyDomComponents.bind(this), function () {
    if (this.dirty) {
      sizes = this._getDomComponentsSizes.bind(this)();
    }
  }.bind(this), function () {
    if (this.dirty) {
      this._updateDomComponentsSizes.bind(this)(sizes);
    }
  }.bind(this), // repaint DOM additionals
  this._repaintDomAdditionals.bind(this)];

  if (returnQueue) {
    return queue;
  } else {
    var result;
    queue.forEach(function (fn) {
      result = fn();
    });
    return result;
  }
};
/**
 * Show the item in the DOM (when not already visible). The items DOM will
 * be created when needed.
 */


BackgroundItem.prototype.show = RangeItem_1.prototype.show;
/**
 * Hide the item from the DOM (when visible)
 * @return {Boolean} changed
 */

BackgroundItem.prototype.hide = RangeItem_1.prototype.hide;
/**
 * Reposition the item horizontally
 * @Override
 */

BackgroundItem.prototype.repositionX = RangeItem_1.prototype.repositionX;
/**
 * Reposition the item vertically
 * @Override
 */

BackgroundItem.prototype.repositionY = function (margin) {
  // eslint-disable-line no-unused-vars
  var height;
  var orientation = this.options.orientation.item; // special positioning for subgroups

  if (this.data.subgroup !== undefined) {
    // TODO: instead of calculating the top position of the subgroups here for every BackgroundItem, calculate the top of the subgroup once in Itemset
    var itemSubgroup = this.data.subgroup;
    this.dom.box.style.height = this.parent.subgroups[itemSubgroup].height + 'px';

    if (orientation == 'top') {
      this.dom.box.style.top = this.parent.top + this.parent.subgroups[itemSubgroup].top + 'px';
    } else {
      this.dom.box.style.top = this.parent.top + this.parent.height - this.parent.subgroups[itemSubgroup].top - this.parent.subgroups[itemSubgroup].height + 'px';
    }

    this.dom.box.style.bottom = '';
  } // and in the case of no subgroups:
  else {
      // we want backgrounds with groups to only show in groups.
      if (this.parent instanceof BackgroundGroup_1) {
        // if the item is not in a group:
        height = Math.max(this.parent.height, this.parent.itemSet.body.domProps.center.height, this.parent.itemSet.body.domProps.centerContainer.height);
        this.dom.box.style.bottom = orientation == 'bottom' ? '0' : '';
        this.dom.box.style.top = orientation == 'top' ? '0' : '';
      } else {
        height = this.parent.height; // same alignment for items when orientation is top or bottom

        this.dom.box.style.top = this.parent.top + 'px';
        this.dom.box.style.bottom = '';
      }
    }

  this.dom.box.style.height = height + 'px';
};

var BackgroundItem_1 = BackgroundItem;

/**
 * Popup is a class to create a popup window with some text
 */

var Popup =
/*#__PURE__*/
function () {
  /**
   * @param {Element} container       The container object.
   * @param {string}  overflowMethod  How the popup should act to overflowing ('flip' or 'cap')
   */
  function Popup(container, overflowMethod) {
    _classCallCheck$1(this, Popup);

    this.container = container;
    this.overflowMethod = overflowMethod || 'cap';
    this.x = 0;
    this.y = 0;
    this.padding = 5;
    this.hidden = false; // create the frame

    this.frame = document.createElement('div');
    this.frame.className = 'vis-tooltip';
    this.container.appendChild(this.frame);
  }
  /**
   * @param {number} x   Horizontal position of the popup window
   * @param {number} y   Vertical position of the popup window
   */


  _createClass$1(Popup, [{
    key: "setPosition",
    value: function setPosition(x, y) {
      this.x = parseInt(x);
      this.y = parseInt(y);
    }
    /**
     * Set the content for the popup window. This can be HTML code or text.
     * @param {string | Element} content
     */

  }, {
    key: "setText",
    value: function setText(content) {
      if (content instanceof Element) {
        this.frame.innerHTML = '';
        this.frame.appendChild(content);
      } else {
        this.frame.innerHTML = content; // string containing text or HTML
      }
    }
    /**
     * Show the popup window
     * @param {boolean} [doShow]    Show or hide the window
     */

  }, {
    key: "show",
    value: function show(doShow) {
      if (doShow === undefined) {
        doShow = true;
      }

      if (doShow === true) {
        var height = this.frame.clientHeight;
        var width = this.frame.clientWidth;
        var maxHeight = this.frame.parentNode.clientHeight;
        var maxWidth = this.frame.parentNode.clientWidth;
        var left = 0,
            top = 0;

        if (this.overflowMethod == 'flip') {
          var isLeft = false,
              isTop = true; // Where around the position it's located

          if (this.y - height < this.padding) {
            isTop = false;
          }

          if (this.x + width > maxWidth - this.padding) {
            isLeft = true;
          }

          if (isLeft) {
            left = this.x - width;
          } else {
            left = this.x;
          }

          if (isTop) {
            top = this.y - height;
          } else {
            top = this.y;
          }
        } else {
          top = this.y - height;

          if (top + height + this.padding > maxHeight) {
            top = maxHeight - height - this.padding;
          }

          if (top < this.padding) {
            top = this.padding;
          }

          left = this.x;

          if (left + width + this.padding > maxWidth) {
            left = maxWidth - width - this.padding;
          }

          if (left < this.padding) {
            left = this.padding;
          }
        }

        this.frame.style.left = left + "px";
        this.frame.style.top = top + "px";
        this.frame.style.visibility = "visible";
        this.hidden = false;
      } else {
        this.hide();
      }
    }
    /**
     * Hide the popup window
     */

  }, {
    key: "hide",
    value: function hide() {
      this.hidden = true;
      this.frame.style.left = "0";
      this.frame.style.top = "0";
      this.frame.style.visibility = "hidden";
    }
    /**
     * Remove the popup window
     */

  }, {
    key: "destroy",
    value: function destroy() {
      this.frame.parentNode.removeChild(this.frame); // Remove element from DOM
    }
  }]);

  return Popup;
}();

var UNGROUPED = '__ungrouped__'; // reserved group id for ungrouped items

var BACKGROUND = '__background__'; // reserved group id for background items without group

/**
 * An ItemSet holds a set of items and ranges which can be displayed in a
 * range. The width is determined by the parent of the ItemSet, and the height
 * is determined by the size of the items.
 * @param {{dom: Object, domProps: Object, emitter: Emitter, range: Range}} body
 * @param {Object} [options]      See ItemSet.setOptions for the available options.
 * @constructor ItemSet
 * @extends Component
 */

function ItemSet(body, options) {
  this.body = body;
  this.defaultOptions = {
    type: null,
    // 'box', 'point', 'range', 'background'
    orientation: {
      item: 'bottom' // item orientation: 'top' or 'bottom'

    },
    align: 'auto',
    // alignment of box items
    stack: true,
    stackSubgroups: true,
    groupOrderSwap: function groupOrderSwap(fromGroup, toGroup, groups) {
      // eslint-disable-line no-unused-vars
      var targetOrder = toGroup.order;
      toGroup.order = fromGroup.order;
      fromGroup.order = targetOrder;
    },
    groupOrder: 'order',
    selectable: true,
    multiselect: false,
    itemsAlwaysDraggable: {
      item: false,
      range: false
    },
    editable: {
      updateTime: false,
      updateGroup: false,
      add: false,
      remove: false,
      overrideItems: false
    },
    groupEditable: {
      order: false,
      add: false,
      remove: false
    },
    snap: TimeStep_1.snap,
    // Only called when `objectData.target === 'item'.
    onDropObjectOnItem: function onDropObjectOnItem(objectData, item, callback) {
      callback(item);
    },
    onAdd: function onAdd(item, callback) {
      callback(item);
    },
    onUpdate: function onUpdate(item, callback) {
      callback(item);
    },
    onMove: function onMove(item, callback) {
      callback(item);
    },
    onRemove: function onRemove(item, callback) {
      callback(item);
    },
    onMoving: function onMoving(item, callback) {
      callback(item);
    },
    onAddGroup: function onAddGroup(item, callback) {
      callback(item);
    },
    onMoveGroup: function onMoveGroup(item, callback) {
      callback(item);
    },
    onRemoveGroup: function onRemoveGroup(item, callback) {
      callback(item);
    },
    margin: {
      item: {
        horizontal: 10,
        vertical: 10
      },
      axis: 20
    },
    showTooltips: true,
    tooltip: {
      followMouse: false,
      overflowMethod: 'flip'
    },
    tooltipOnItemUpdateTime: false
  }; // options is shared by this ItemSet and all its items

  this.options = util.extend({}, this.defaultOptions);
  this.options.rtl = options.rtl;
  this.options.onTimeout = options.onTimeout; // options for getting items from the DataSet with the correct type

  this.itemOptions = {
    type: {
      start: 'Date',
      end: 'Date'
    }
  };
  this.conversion = {
    toScreen: body.util.toScreen,
    toTime: body.util.toTime
  };
  this.dom = {};
  this.props = {};
  this.hammer = null;
  var me = this;
  this.itemsData = null; // DataSet

  this.groupsData = null; // DataSet

  this.itemsSettingTime = null;
  this.initialItemSetDrawn = false;
  this.userContinueNotBail = null; // listeners for the DataSet of the items

  this.itemListeners = {
    'add': function add(event, params, senderId) {
      // eslint-disable-line no-unused-vars
      me._onAdd(params.items);
    },
    'update': function update(event, params, senderId) {
      // eslint-disable-line no-unused-vars
      me._onUpdate(params.items);
    },
    'remove': function remove(event, params, senderId) {
      // eslint-disable-line no-unused-vars
      me._onRemove(params.items);
    }
  }; // listeners for the DataSet of the groups

  this.groupListeners = {
    'add': function add(event, params, senderId) {
      // eslint-disable-line no-unused-vars
      me._onAddGroups(params.items);

      if (me.groupsData && me.groupsData.length > 0) {
        var groupsData = me.groupsData.getDataSet();
        groupsData.get().forEach(function (groupData) {
          if (groupData.nestedGroups) {
            if (groupData.showNested != false) {
              groupData.showNested = true;
            }

            var updatedGroups = [];
            groupData.nestedGroups.forEach(function (nestedGroupId) {
              var updatedNestedGroup = groupsData.get(nestedGroupId);

              if (!updatedNestedGroup) {
                return;
              }

              updatedNestedGroup.nestedInGroup = groupData.id;

              if (groupData.showNested == false) {
                updatedNestedGroup.visible = false;
              }

              updatedGroups = updatedGroups.concat(updatedNestedGroup);
            });
            groupsData.update(updatedGroups, senderId);
          }
        });
      }
    },
    'update': function update(event, params, senderId) {
      // eslint-disable-line no-unused-vars
      me._onUpdateGroups(params.items);
    },
    'remove': function remove(event, params, senderId) {
      // eslint-disable-line no-unused-vars
      me._onRemoveGroups(params.items);
    }
  };
  this.items = {}; // object with an Item for every data item

  this.groups = {}; // Group object for every group

  this.groupIds = [];
  this.selection = []; // list with the ids of all selected nodes

  this.popup = null;
  this.popupTimer = null;
  this.touchParams = {}; // stores properties while dragging

  this.groupTouchParams = {}; // create the HTML DOM

  this._create();

  this.setOptions(options);
}

ItemSet.prototype = new Component_1(); // available item types will be registered here

ItemSet.types = {
  background: BackgroundItem_1,
  box: BoxItem_1,
  range: RangeItem_1,
  point: PointItem_1
};
/**
 * Create the HTML DOM for the ItemSet
 */

ItemSet.prototype._create = function () {
  var frame = document.createElement('div');
  frame.className = 'vis-itemset';
  frame['timeline-itemset'] = this;
  this.dom.frame = frame; // create background panel

  var background = document.createElement('div');
  background.className = 'vis-background';
  frame.appendChild(background);
  this.dom.background = background; // create foreground panel

  var foreground = document.createElement('div');
  foreground.className = 'vis-foreground';
  frame.appendChild(foreground);
  this.dom.foreground = foreground; // create axis panel

  var axis = document.createElement('div');
  axis.className = 'vis-axis';
  this.dom.axis = axis; // create labelset

  var labelSet = document.createElement('div');
  labelSet.className = 'vis-labelset';
  this.dom.labelSet = labelSet; // create ungrouped Group

  this._updateUngrouped(); // create background Group


  var backgroundGroup = new BackgroundGroup_1(BACKGROUND, null, this);
  backgroundGroup.show();
  this.groups[BACKGROUND] = backgroundGroup; // attach event listeners
  // Note: we bind to the centerContainer for the case where the height
  //       of the center container is larger than of the ItemSet, so we
  //       can click in the empty area to create a new item or deselect an item.

  this.hammer = new hammer$1(this.body.dom.centerContainer); // drag items when selected

  this.hammer.on('hammer.input', function (event) {
    if (event.isFirst) {
      this._onTouch(event);
    }
  }.bind(this));
  this.hammer.on('panstart', this._onDragStart.bind(this));
  this.hammer.on('panmove', this._onDrag.bind(this));
  this.hammer.on('panend', this._onDragEnd.bind(this));
  this.hammer.get('pan').set({
    threshold: 5,
    direction: hammer$1.DIRECTION_HORIZONTAL
  }); // single select (or unselect) when tapping an item

  this.hammer.on('tap', this._onSelectItem.bind(this)); // multi select when holding mouse/touch, or on ctrl+click

  this.hammer.on('press', this._onMultiSelectItem.bind(this)); // add item on doubletap

  this.hammer.on('doubletap', this._onAddItem.bind(this));

  if (this.options.rtl) {
    this.groupHammer = new hammer$1(this.body.dom.rightContainer);
  } else {
    this.groupHammer = new hammer$1(this.body.dom.leftContainer);
  }

  this.groupHammer.on('tap', this._onGroupClick.bind(this));
  this.groupHammer.on('panstart', this._onGroupDragStart.bind(this));
  this.groupHammer.on('panmove', this._onGroupDrag.bind(this));
  this.groupHammer.on('panend', this._onGroupDragEnd.bind(this));
  this.groupHammer.get('pan').set({
    threshold: 5,
    direction: hammer$1.DIRECTION_VERTICAL
  });
  this.body.dom.centerContainer.addEventListener('mouseover', this._onMouseOver.bind(this));
  this.body.dom.centerContainer.addEventListener('mouseout', this._onMouseOut.bind(this));
  this.body.dom.centerContainer.addEventListener('mousemove', this._onMouseMove.bind(this)); // right-click on timeline 

  this.body.dom.centerContainer.addEventListener('contextmenu', this._onDragEnd.bind(this));
  this.body.dom.centerContainer.addEventListener('mousewheel', this._onMouseWheel.bind(this)); // attach to the DOM

  this.show();
};
/**
 * Set options for the ItemSet. Existing options will be extended/overwritten.
 * @param {Object} [options] The following options are available:
 *                           {string} type
 *                              Default type for the items. Choose from 'box'
 *                              (default), 'point', 'range', or 'background'.
 *                              The default style can be overwritten by
 *                              individual items.
 *                           {string} align
 *                              Alignment for the items, only applicable for
 *                              BoxItem. Choose 'center' (default), 'left', or
 *                              'right'.
 *                           {string} orientation.item
 *                              Orientation of the item set. Choose 'top' or
 *                              'bottom' (default).
 *                           {Function} groupOrder
 *                              A sorting function for ordering groups
 *                           {boolean} stack
 *                              If true (default), items will be stacked on
 *                              top of each other.
 *                           {number} margin.axis
 *                              Margin between the axis and the items in pixels.
 *                              Default is 20.
 *                           {number} margin.item.horizontal
 *                              Horizontal margin between items in pixels.
 *                              Default is 10.
 *                           {number} margin.item.vertical
 *                              Vertical Margin between items in pixels.
 *                              Default is 10.
 *                           {number} margin.item
 *                              Margin between items in pixels in both horizontal
 *                              and vertical direction. Default is 10.
 *                           {number} margin
 *                              Set margin for both axis and items in pixels.
 *                           {boolean} selectable
 *                              If true (default), items can be selected.
 *                           {boolean} multiselect
 *                              If true, multiple items can be selected.
 *                              False by default.
 *                           {boolean} editable
 *                              Set all editable options to true or false
 *                           {boolean} editable.updateTime
 *                              Allow dragging an item to an other moment in time
 *                           {boolean} editable.updateGroup
 *                              Allow dragging an item to an other group
 *                           {boolean} editable.add
 *                              Allow creating new items on double tap
 *                           {boolean} editable.remove
 *                              Allow removing items by clicking the delete button
 *                              top right of a selected item.
 *                           {Function(item: Item, callback: Function)} onAdd
 *                              Callback function triggered when an item is about to be added:
 *                              when the user double taps an empty space in the Timeline.
 *                           {Function(item: Item, callback: Function)} onUpdate
 *                              Callback function fired when an item is about to be updated.
 *                              This function typically has to show a dialog where the user
 *                              change the item. If not implemented, nothing happens.
 *                           {Function(item: Item, callback: Function)} onMove
 *                              Fired when an item has been moved. If not implemented,
 *                              the move action will be accepted.
 *                           {Function(item: Item, callback: Function)} onRemove
 *                              Fired when an item is about to be deleted.
 *                              If not implemented, the item will be always removed.
 */


ItemSet.prototype.setOptions = function (options) {
  if (options) {
    // copy all options that we know
    var fields = ['type', 'rtl', 'align', 'order', 'stack', 'stackSubgroups', 'selectable', 'multiselect', 'multiselectPerGroup', 'groupOrder', 'dataAttributes', 'template', 'groupTemplate', 'visibleFrameTemplate', 'hide', 'snap', 'groupOrderSwap', 'showTooltips', 'tooltip', 'tooltipOnItemUpdateTime', 'groupHeightMode', 'onTimeout', 'groupLabelDirection'];
    util.selectiveExtend(fields, this.options, options);

    if ('itemsAlwaysDraggable' in options) {
      if (typeof options.itemsAlwaysDraggable === 'boolean') {
        this.options.itemsAlwaysDraggable.item = options.itemsAlwaysDraggable;
        this.options.itemsAlwaysDraggable.range = false;
      } else if (_typeof$1(options.itemsAlwaysDraggable) === 'object') {
        util.selectiveExtend(['item', 'range'], this.options.itemsAlwaysDraggable, options.itemsAlwaysDraggable); // only allow range always draggable when item is always draggable as well

        if (!this.options.itemsAlwaysDraggable.item) {
          this.options.itemsAlwaysDraggable.range = false;
        }
      }
    }

    if ('orientation' in options) {
      if (typeof options.orientation === 'string') {
        this.options.orientation.item = options.orientation === 'top' ? 'top' : 'bottom';
      } else if (_typeof$1(options.orientation) === 'object' && 'item' in options.orientation) {
        this.options.orientation.item = options.orientation.item;
      }
    }

    if ('margin' in options) {
      if (typeof options.margin === 'number') {
        this.options.margin.axis = options.margin;
        this.options.margin.item.horizontal = options.margin;
        this.options.margin.item.vertical = options.margin;
      } else if (_typeof$1(options.margin) === 'object') {
        util.selectiveExtend(['axis'], this.options.margin, options.margin);

        if ('item' in options.margin) {
          if (typeof options.margin.item === 'number') {
            this.options.margin.item.horizontal = options.margin.item;
            this.options.margin.item.vertical = options.margin.item;
          } else if (_typeof$1(options.margin.item) === 'object') {
            util.selectiveExtend(['horizontal', 'vertical'], this.options.margin.item, options.margin.item);
          }
        }
      }
    }

    if ('editable' in options) {
      if (typeof options.editable === 'boolean') {
        this.options.editable.updateTime = options.editable;
        this.options.editable.updateGroup = options.editable;
        this.options.editable.add = options.editable;
        this.options.editable.remove = options.editable;
        this.options.editable.overrideItems = false;
      } else if (_typeof$1(options.editable) === 'object') {
        util.selectiveExtend(['updateTime', 'updateGroup', 'add', 'remove', 'overrideItems'], this.options.editable, options.editable);
      }
    }

    if ('groupEditable' in options) {
      if (typeof options.groupEditable === 'boolean') {
        this.options.groupEditable.order = options.groupEditable;
        this.options.groupEditable.add = options.groupEditable;
        this.options.groupEditable.remove = options.groupEditable;
      } else if (_typeof$1(options.groupEditable) === 'object') {
        util.selectiveExtend(['order', 'add', 'remove'], this.options.groupEditable, options.groupEditable);
      }
    } // callback functions


    var addCallback = function (name) {
      var fn = options[name];

      if (fn) {
        if (!(fn instanceof Function)) {
          throw new Error('option ' + name + ' must be a function ' + name + '(item, callback)');
        }

        this.options[name] = fn;
      }
    }.bind(this);

    ['onDropObjectOnItem', 'onAdd', 'onUpdate', 'onRemove', 'onMove', 'onMoving', 'onAddGroup', 'onMoveGroup', 'onRemoveGroup'].forEach(addCallback); // force the itemSet to refresh: options like orientation and margins may be changed

    this.markDirty();
  }
};
/**
 * Mark the ItemSet dirty so it will refresh everything with next redraw.
 * Optionally, all items can be marked as dirty and be refreshed.
 * @param {{refreshItems: boolean}} [options]
 */


ItemSet.prototype.markDirty = function (options) {
  this.groupIds = [];

  if (options && options.refreshItems) {
    util.forEach(this.items, function (item) {
      item.dirty = true;
      if (item.displayed) item.redraw();
    });
  }
};
/**
 * Destroy the ItemSet
 */


ItemSet.prototype.destroy = function () {
  this.clearPopupTimer();
  this.hide();
  this.setItems(null);
  this.setGroups(null);
  this.hammer && this.hammer.destroy();
  this.groupHammer && this.groupHammer.destroy();
  this.hammer = null;
  this.body = null;
  this.conversion = null;
};
/**
 * Hide the component from the DOM
 */


ItemSet.prototype.hide = function () {
  // remove the frame containing the items
  if (this.dom.frame.parentNode) {
    this.dom.frame.parentNode.removeChild(this.dom.frame);
  } // remove the axis with dots


  if (this.dom.axis.parentNode) {
    this.dom.axis.parentNode.removeChild(this.dom.axis);
  } // remove the labelset containing all group labels


  if (this.dom.labelSet.parentNode) {
    this.dom.labelSet.parentNode.removeChild(this.dom.labelSet);
  }
};
/**
 * Show the component in the DOM (when not already visible).
 */


ItemSet.prototype.show = function () {
  // show frame containing the items
  if (!this.dom.frame.parentNode) {
    this.body.dom.center.appendChild(this.dom.frame);
  } // show axis with dots


  if (!this.dom.axis.parentNode) {
    this.body.dom.backgroundVertical.appendChild(this.dom.axis);
  } // show labelset containing labels


  if (!this.dom.labelSet.parentNode) {
    if (this.options.rtl) {
      this.body.dom.right.appendChild(this.dom.labelSet);
    } else {
      this.body.dom.left.appendChild(this.dom.labelSet);
    }
  }
};
/**
 * Activates the popup timer to show the given popup after a fixed time.
 * @param {any} popup
 */


ItemSet.prototype.setPopupTimer = function (popup) {
  this.clearPopupTimer();

  if (popup) {
    this.popupTimer = setTimeout(function () {
      popup.show();
    }, 500);
  }
};
/**
 * Clears the popup timer for the tooltip.
 */


ItemSet.prototype.clearPopupTimer = function () {
  if (this.popupTimer != null) {
    clearTimeout(this.popupTimer);
    this.popupTimer = null;
  }
};
/**
 * Set selected items by their id. Replaces the current selection
 * Unknown id's are silently ignored.
 * @param {string[] | string} [ids] An array with zero or more id's of the items to be
 *                                  selected, or a single item id. If ids is undefined
 *                                  or an empty array, all items will be unselected.
 */


ItemSet.prototype.setSelection = function (ids) {
  var i, ii, id, item;
  if (ids == undefined) ids = [];
  if (!Array.isArray(ids)) ids = [ids]; // unselect currently selected items

  for (i = 0, ii = this.selection.length; i < ii; i++) {
    id = this.selection[i];
    item = this.items[id];
    if (item) item.unselect();
  } // select items


  this.selection = [];

  for (i = 0, ii = ids.length; i < ii; i++) {
    id = ids[i];
    item = this.items[id];

    if (item) {
      this.selection.push(id);
      item.select();
    }
  }
};
/**
 * Get the selected items by their id
 * @return {Array} ids  The ids of the selected items
 */


ItemSet.prototype.getSelection = function () {
  return this.selection.concat([]);
};
/**
 * Get the id's of the currently visible items.
 * @returns {Array} The ids of the visible items
 */


ItemSet.prototype.getVisibleItems = function () {
  var range = this.body.range.getRange();
  var right, left;

  if (this.options.rtl) {
    right = this.body.util.toScreen(range.start);
    left = this.body.util.toScreen(range.end);
  } else {
    left = this.body.util.toScreen(range.start);
    right = this.body.util.toScreen(range.end);
  }

  var ids = [];

  for (var groupId in this.groups) {
    if (this.groups.hasOwnProperty(groupId)) {
      var group = this.groups[groupId];
      var rawVisibleItems = group.isVisible ? group.visibleItems : []; // filter the "raw" set with visibleItems into a set which is really
      // visible by pixels

      for (var i = 0; i < rawVisibleItems.length; i++) {
        var item = rawVisibleItems[i]; // TODO: also check whether visible vertically

        if (this.options.rtl) {
          if (item.right < left && item.right + item.width > right) {
            ids.push(item.id);
          }
        } else {
          if (item.left < right && item.left + item.width > left) {
            ids.push(item.id);
          }
        }
      }
    }
  }

  return ids;
};
/**
 * Get the id's of the currently visible groups.
 * @returns {Array} The ids of the visible groups
 */


ItemSet.prototype.getVisibleGroups = function () {
  var ids = [];

  for (var groupId in this.groups) {
    if (this.groups.hasOwnProperty(groupId)) {
      var group = this.groups[groupId];

      if (group.isVisible) {
        ids.push(groupId);
      }
    }
  }

  return ids;
};
/**
 * Deselect a selected item
 * @param {string | number} id
 * @private
 */


ItemSet.prototype._deselect = function (id) {
  var selection = this.selection;

  for (var i = 0, ii = selection.length; i < ii; i++) {
    if (selection[i] == id) {
      // non-strict comparison!
      selection.splice(i, 1);
      break;
    }
  }
};
/**
 * Repaint the component
 * @return {boolean} Returns true if the component is resized
 */


ItemSet.prototype.redraw = function () {
  var margin = this.options.margin,
      range = this.body.range,
      asSize = util.option.asSize,
      options = this.options,
      orientation = options.orientation.item,
      resized = false,
      frame = this.dom.frame; // recalculate absolute position (before redrawing groups)

  this.props.top = this.body.domProps.top.height + this.body.domProps.border.top;

  if (this.options.rtl) {
    this.props.right = this.body.domProps.right.width + this.body.domProps.border.right;
  } else {
    this.props.left = this.body.domProps.left.width + this.body.domProps.border.left;
  } // update class name


  frame.className = 'vis-itemset'; // reorder the groups (if needed)

  resized = this._orderGroups() || resized; // check whether zoomed (in that case we need to re-stack everything)
  // TODO: would be nicer to get this as a trigger from Range

  var visibleInterval = range.end - range.start;
  var zoomed = visibleInterval != this.lastVisibleInterval || this.props.width != this.props.lastWidth;
  var scrolled = range.start != this.lastRangeStart;
  var changedStackOption = options.stack != this.lastStack;
  var changedStackSubgroupsOption = options.stackSubgroups != this.lastStackSubgroups;
  var forceRestack = zoomed || scrolled || changedStackOption || changedStackSubgroupsOption;
  this.lastVisibleInterval = visibleInterval;
  this.lastRangeStart = range.start;
  this.lastStack = options.stack;
  this.lastStackSubgroups = options.stackSubgroups;
  this.props.lastWidth = this.props.width;

  var firstGroup = this._firstGroup();

  var firstMargin = {
    item: margin.item,
    axis: margin.axis
  };
  var nonFirstMargin = {
    item: margin.item,
    axis: margin.item.vertical / 2
  };
  var height = 0;
  var minHeight = margin.axis + margin.item.vertical; // redraw the background group

  this.groups[BACKGROUND].redraw(range, nonFirstMargin, forceRestack);
  var redrawQueue = {};
  var redrawQueueLength = 0; // collect redraw functions

  util.forEach(this.groups, function (group, key) {
    if (key === BACKGROUND) return;
    var groupMargin = group == firstGroup ? firstMargin : nonFirstMargin;
    var returnQueue = true;
    redrawQueue[key] = group.redraw(range, groupMargin, forceRestack, returnQueue);
    redrawQueueLength = redrawQueue[key].length;
  });
  var needRedraw = redrawQueueLength > 0;

  if (needRedraw) {
    var redrawResults = {};

    for (var i = 0; i < redrawQueueLength; i++) {
      util.forEach(redrawQueue, function (fns, key) {
        redrawResults[key] = fns[i]();
      });
    } // redraw all regular groups


    util.forEach(this.groups, function (group, key) {
      if (key === BACKGROUND) return;
      var groupResized = redrawResults[key];
      resized = groupResized || resized;
      height += group.height;
    });
    height = Math.max(height, minHeight);
  }

  height = Math.max(height, minHeight); // update frame height

  frame.style.height = asSize(height); // calculate actual size

  this.props.width = frame.offsetWidth;
  this.props.height = height; // reposition axis

  this.dom.axis.style.top = asSize(orientation == 'top' ? this.body.domProps.top.height + this.body.domProps.border.top : this.body.domProps.top.height + this.body.domProps.centerContainer.height);

  if (this.options.rtl) {
    this.dom.axis.style.right = '0';
  } else {
    this.dom.axis.style.left = '0';
  }

  this.initialItemSetDrawn = true; // check if this component is resized

  resized = this._isResized() || resized;
  return resized;
};
/**
 * Get the first group, aligned with the axis
 * @return {Group | null} firstGroup
 * @private
 */


ItemSet.prototype._firstGroup = function () {
  var firstGroupIndex = this.options.orientation.item == 'top' ? 0 : this.groupIds.length - 1;
  var firstGroupId = this.groupIds[firstGroupIndex];
  var firstGroup = this.groups[firstGroupId] || this.groups[UNGROUPED];
  return firstGroup || null;
};
/**
 * Create or delete the group holding all ungrouped items. This group is used when
 * there are no groups specified.
 * @protected
 */


ItemSet.prototype._updateUngrouped = function () {
  var ungrouped = this.groups[UNGROUPED];
  var item, itemId;

  if (this.groupsData) {
    // remove the group holding all ungrouped items
    if (ungrouped) {
      ungrouped.hide();
      delete this.groups[UNGROUPED];

      for (itemId in this.items) {
        if (this.items.hasOwnProperty(itemId)) {
          item = this.items[itemId];
          item.parent && item.parent.remove(item);

          var groupId = this._getGroupId(item.data);

          var group = this.groups[groupId];
          group && group.add(item) || item.hide();
        }
      }
    }
  } else {
    // create a group holding all (unfiltered) items
    if (!ungrouped) {
      var id = null;
      var data = null;
      ungrouped = new Group_1(id, data, this);
      this.groups[UNGROUPED] = ungrouped;

      for (itemId in this.items) {
        if (this.items.hasOwnProperty(itemId)) {
          item = this.items[itemId];
          ungrouped.add(item);
        }
      }

      ungrouped.show();
    }
  }
};
/**
 * Get the element for the labelset
 * @return {HTMLElement} labelSet
 */


ItemSet.prototype.getLabelSet = function () {
  return this.dom.labelSet;
};
/**
 * Set items
 * @param {vis.DataSet | null} items
 */


ItemSet.prototype.setItems = function (items) {
  this.itemsSettingTime = new Date();
  var me = this,
      ids,
      oldItemsData = this.itemsData; // replace the dataset

  if (!items) {
    this.itemsData = null;
  } else if (items instanceof DataSet || items instanceof DataView) {
    this.itemsData = items;
  } else {
    throw new TypeError('Data must be an instance of DataSet or DataView');
  }

  if (oldItemsData) {
    // unsubscribe from old dataset
    util.forEach(this.itemListeners, function (callback, event) {
      oldItemsData.off(event, callback);
    }); // remove all drawn items

    ids = oldItemsData.getIds();

    this._onRemove(ids);
  }

  if (this.itemsData) {
    // subscribe to new dataset
    var id = this.id;
    util.forEach(this.itemListeners, function (callback, event) {
      me.itemsData.on(event, callback, id);
    }); // add all new items

    ids = this.itemsData.getIds();

    this._onAdd(ids); // update the group holding all ungrouped items


    this._updateUngrouped();
  }

  this.body.emitter.emit('_change', {
    queue: true
  });
};
/**
 * Get the current items
 * @returns {vis.DataSet | null}
 */


ItemSet.prototype.getItems = function () {
  return this.itemsData;
};
/**
 * Set groups
 * @param {vis.DataSet} groups
 */


ItemSet.prototype.setGroups = function (groups) {
  var me = this,
      ids; // unsubscribe from current dataset

  if (this.groupsData) {
    util.forEach(this.groupListeners, function (callback, event) {
      me.groupsData.off(event, callback);
    }); // remove all drawn groups

    ids = this.groupsData.getIds();
    this.groupsData = null;

    this._onRemoveGroups(ids); // note: this will cause a redraw

  } // replace the dataset


  if (!groups) {
    this.groupsData = null;
  } else if (groups instanceof DataSet || groups instanceof DataView) {
    this.groupsData = groups;
  } else {
    throw new TypeError('Data must be an instance of DataSet or DataView');
  }

  if (this.groupsData) {
    // go over all groups nesting
    var groupsData = this.groupsData;

    if (this.groupsData instanceof DataView) {
      groupsData = this.groupsData.getDataSet();
    }

    groupsData.get().forEach(function (group) {
      if (group.nestedGroups) {
        group.nestedGroups.forEach(function (nestedGroupId) {
          var updatedNestedGroup = groupsData.get(nestedGroupId);
          updatedNestedGroup.nestedInGroup = group.id;

          if (group.showNested == false) {
            updatedNestedGroup.visible = false;
          }

          groupsData.update(updatedNestedGroup);
        });
      }
    }); // subscribe to new dataset

    var id = this.id;
    util.forEach(this.groupListeners, function (callback, event) {
      me.groupsData.on(event, callback, id);
    }); // draw all ms

    ids = this.groupsData.getIds();

    this._onAddGroups(ids);
  } // update the group holding all ungrouped items


  this._updateUngrouped(); // update the order of all items in each group


  this._order();

  this.body.emitter.emit('_change', {
    queue: true
  });
};
/**
 * Get the current groups
 * @returns {vis.DataSet | null} groups
 */


ItemSet.prototype.getGroups = function () {
  return this.groupsData;
};
/**
 * Remove an item by its id
 * @param {string | number} id
 */


ItemSet.prototype.removeItem = function (id) {
  var item = this.itemsData.get(id),
      dataset = this.itemsData.getDataSet();

  if (item) {
    // confirm deletion
    this.options.onRemove(item, function (item) {
      if (item) {
        // remove by id here, it is possible that an item has no id defined
        // itself, so better not delete by the item itself
        dataset.remove(id);
      }
    });
  }
};
/**
 * Get the time of an item based on it's data and options.type
 * @param {Object} itemData
 * @returns {string} Returns the type
 * @private
 */


ItemSet.prototype._getType = function (itemData) {
  return itemData.type || this.options.type || (itemData.end ? 'range' : 'box');
};
/**
 * Get the group id for an item
 * @param {Object} itemData
 * @returns {string} Returns the groupId
 * @private
 */


ItemSet.prototype._getGroupId = function (itemData) {
  var type = this._getType(itemData);

  if (type == 'background' && itemData.group == undefined) {
    return BACKGROUND;
  } else {
    return this.groupsData ? itemData.group : UNGROUPED;
  }
};
/**
 * Handle updated items
 * @param {number[]} ids
 * @protected
 */


ItemSet.prototype._onUpdate = function (ids) {
  var me = this;
  ids.forEach(function (id) {
    var itemData = me.itemsData.get(id, me.itemOptions);
    var item = me.items[id];
    var type = itemData ? me._getType(itemData) : null;
    var constructor = ItemSet.types[type];
    var selected;

    if (item) {
      // update item   	
      if (!constructor || !(item instanceof constructor)) {
        // item type has changed, delete the item and recreate it
        selected = item.selected; // preserve selection of this item

        me._removeItem(item);

        item = null;
      } else {
        me._updateItem(item, itemData);
      }
    }

    if (!item && itemData) {
      // create item
      if (constructor) {
        item = new constructor(itemData, me.conversion, me.options);
        item.id = id; // TODO: not so nice setting id afterwards

        me._addItem(item);

        if (selected) {
          this.selection.push(id);
          item.select();
        }
      } else if (type == 'rangeoverflow') {
        // TODO: deprecated since version 2.1.0 (or 3.0.0?). cleanup some day
        throw new TypeError('Item type "rangeoverflow" is deprecated. Use css styling instead: ' + '.vis-item.vis-range .vis-item-content {overflow: visible;}');
      } else {
        throw new TypeError('Unknown item type "' + type + '"');
      }
    }
  }.bind(this));

  this._order();

  this.body.emitter.emit('_change', {
    queue: true
  });
};
/**
 * Handle added items
 * @param {number[]} ids
 * @protected
 */


ItemSet.prototype._onAdd = ItemSet.prototype._onUpdate;
/**
 * Handle removed items
 * @param {number[]} ids
 * @protected
 */

ItemSet.prototype._onRemove = function (ids) {
  var count = 0;
  var me = this;
  ids.forEach(function (id) {
    var item = me.items[id];

    if (item) {
      count++;

      me._removeItem(item);
    }
  });

  if (count) {
    // update order
    this._order();

    this.body.emitter.emit('_change', {
      queue: true
    });
  }
};
/**
 * Update the order of item in all groups
 * @private
 */


ItemSet.prototype._order = function () {
  // reorder the items in all groups
  // TODO: optimization: only reorder groups affected by the changed items
  util.forEach(this.groups, function (group) {
    group.order();
  });
};
/**
 * Handle updated groups
 * @param {number[]} ids
 * @private
 */


ItemSet.prototype._onUpdateGroups = function (ids) {
  this._onAddGroups(ids);
};
/**
 * Handle changed groups (added or updated)
 * @param {number[]} ids
 * @private
 */


ItemSet.prototype._onAddGroups = function (ids) {
  var me = this;
  ids.forEach(function (id) {
    var groupData = me.groupsData.get(id);
    var group = me.groups[id];

    if (!group) {
      // check for reserved ids
      if (id == UNGROUPED || id == BACKGROUND) {
        throw new Error('Illegal group id. ' + id + ' is a reserved id.');
      }

      var groupOptions = Object.create(me.options);
      util.extend(groupOptions, {
        height: null
      });
      group = new Group_1(id, groupData, me);
      me.groups[id] = group; // add items with this groupId to the new group

      for (var itemId in me.items) {
        if (me.items.hasOwnProperty(itemId)) {
          var item = me.items[itemId];

          if (item.data.group == id) {
            group.add(item);
          }
        }
      }

      group.order();
      group.show();
    } else {
      // update group
      group.setData(groupData);
    }
  });
  this.body.emitter.emit('_change', {
    queue: true
  });
};
/**
 * Handle removed groups
 * @param {number[]} ids
 * @private
 */


ItemSet.prototype._onRemoveGroups = function (ids) {
  var groups = this.groups;
  ids.forEach(function (id) {
    var group = groups[id];

    if (group) {
      group.hide();
      delete groups[id];
    }
  });
  this.markDirty();
  this.body.emitter.emit('_change', {
    queue: true
  });
};
/**
 * Reorder the groups if needed
 * @return {boolean} changed
 * @private
 */


ItemSet.prototype._orderGroups = function () {
  if (this.groupsData) {
    // reorder the groups
    var groupIds = this.groupsData.getIds({
      order: this.options.groupOrder
    });
    groupIds = this._orderNestedGroups(groupIds);
    var changed = !util.equalArray(groupIds, this.groupIds);

    if (changed) {
      // hide all groups, removes them from the DOM
      var groups = this.groups;
      groupIds.forEach(function (groupId) {
        groups[groupId].hide();
      }); // show the groups again, attach them to the DOM in correct order

      groupIds.forEach(function (groupId) {
        groups[groupId].show();
      });
      this.groupIds = groupIds;
    }

    return changed;
  } else {
    return false;
  }
};
/**
 * Reorder the nested groups
 *
 * @param {Array.<number>} groupIds
 * @returns {Array.<number>}
 * @private
 */


ItemSet.prototype._orderNestedGroups = function (groupIds) {
  var _this = this;

  /**
   * Recursively order nested groups
   *
   * @param {ItemSet} t
   * @param {Array.<number>} groupIds
   * @returns {Array.<number>}
   * @private
   */
  function getOrderedNestedGroups(t, groupIds) {
    var result = [];
    groupIds.forEach(function (groupId) {
      result.push(groupId);
      var groupData = t.groupsData.get(groupId);

      if (groupData.nestedGroups) {
        var nestedGroupIds = t.groupsData.get({
          filter: function filter(nestedGroup) {
            return nestedGroup.nestedInGroup == groupId;
          },
          order: t.options.groupOrder
        }).map(function (nestedGroup) {
          return nestedGroup.id;
        });
        result = result.concat(getOrderedNestedGroups(t, nestedGroupIds));
      }
    });
    return result;
  }

  var topGroupIds = groupIds.filter(function (groupId) {
    return !_this.groupsData.get(groupId).nestedInGroup;
  });
  return getOrderedNestedGroups(this, topGroupIds);
};
/**
 * Add a new item
 * @param {Item} item
 * @private
 */


ItemSet.prototype._addItem = function (item) {
  this.items[item.id] = item; // add to group

  var groupId = this._getGroupId(item.data);

  var group = this.groups[groupId];

  if (!group) {
    item.groupShowing = false;
  } else if (group && group.data && group.data.showNested) {
    item.groupShowing = true;
  }

  if (group) group.add(item);
};
/**
 * Update an existing item
 * @param {Item} item
 * @param {Object} itemData
 * @private
 */


ItemSet.prototype._updateItem = function (item, itemData) {
  // update the items data (will redraw the item when displayed)
  item.setData(itemData);

  var groupId = this._getGroupId(item.data);

  var group = this.groups[groupId];

  if (!group) {
    item.groupShowing = false;
  } else if (group && group.data && group.data.showNested) {
    item.groupShowing = true;
  }
};
/**
 * Delete an item from the ItemSet: remove it from the DOM, from the map
 * with items, and from the map with visible items, and from the selection
 * @param {Item} item
 * @private
 */


ItemSet.prototype._removeItem = function (item) {
  // remove from DOM
  item.hide(); // remove from items

  delete this.items[item.id]; // remove from selection

  var index = this.selection.indexOf(item.id);
  if (index != -1) this.selection.splice(index, 1); // remove from group

  item.parent && item.parent.remove(item);
};
/**
 * Create an array containing all items being a range (having an end date)
 * @param {Array.<Object>} array
 * @returns {Array}
 * @private
 */


ItemSet.prototype._constructByEndArray = function (array) {
  var endArray = [];

  for (var i = 0; i < array.length; i++) {
    if (array[i] instanceof RangeItem_1) {
      endArray.push(array[i]);
    }
  }

  return endArray;
};
/**
 * Register the clicked item on touch, before dragStart is initiated.
 *
 * dragStart is initiated from a mousemove event, AFTER the mouse/touch is
 * already moving. Therefore, the mouse/touch can sometimes be above an other
 * DOM element than the item itself.
 *
 * @param {Event} event
 * @private
 */


ItemSet.prototype._onTouch = function (event) {
  // store the touched item, used in _onDragStart
  this.touchParams.item = this.itemFromTarget(event);
  this.touchParams.dragLeftItem = event.target.dragLeftItem || false;
  this.touchParams.dragRightItem = event.target.dragRightItem || false;
  this.touchParams.itemProps = null;
};
/**
 * Given an group id, returns the index it has.
 *
 * @param {number} groupId
 * @returns {number} index / groupId
 * @private
 */


ItemSet.prototype._getGroupIndex = function (groupId) {
  for (var i = 0; i < this.groupIds.length; i++) {
    if (groupId == this.groupIds[i]) return i;
  }
};
/**
 * Start dragging the selected events
 * @param {Event} event
 * @private
 */


ItemSet.prototype._onDragStart = function (event) {
  if (this.touchParams.itemIsDragging) {
    return;
  }

  var item = this.touchParams.item || null;
  var me = this;
  var props;

  if (item && (item.selected || this.options.itemsAlwaysDraggable.item)) {
    if (this.options.editable.overrideItems && !this.options.editable.updateTime && !this.options.editable.updateGroup) {
      return;
    } // override options.editable


    if (item.editable != null && !item.editable.updateTime && !item.editable.updateGroup && !this.options.editable.overrideItems) {
      return;
    }

    var dragLeftItem = this.touchParams.dragLeftItem;
    var dragRightItem = this.touchParams.dragRightItem;
    this.touchParams.itemIsDragging = true;
    this.touchParams.selectedItem = item;

    if (dragLeftItem) {
      props = {
        item: dragLeftItem,
        initialX: event.center.x,
        dragLeft: true,
        data: this._cloneItemData(item.data)
      };
      this.touchParams.itemProps = [props];
    } else if (dragRightItem) {
      props = {
        item: dragRightItem,
        initialX: event.center.x,
        dragRight: true,
        data: this._cloneItemData(item.data)
      };
      this.touchParams.itemProps = [props];
    } else if (this.options.editable.add && (event.srcEvent.ctrlKey || event.srcEvent.metaKey)) {
      // create a new range item when dragging with ctrl key down
      this._onDragStartAddItem(event);
    } else {
      if (this.groupIds.length < 1) {
        // Mitigates a race condition if _onDragStart() is
        // called after markDirty() without redraw() being called between.
        this.redraw();
      }

      var baseGroupIndex = this._getGroupIndex(item.data.group);

      var itemsToDrag = this.options.itemsAlwaysDraggable.item && !item.selected ? [item.id] : this.getSelection();
      this.touchParams.itemProps = itemsToDrag.map(function (id) {
        var item = me.items[id];

        var groupIndex = me._getGroupIndex(item.data.group);

        return {
          item: item,
          initialX: event.center.x,
          groupOffset: baseGroupIndex - groupIndex,
          data: this._cloneItemData(item.data)
        };
      }.bind(this));
    }

    event.stopPropagation();
  } else if (this.options.editable.add && (event.srcEvent.ctrlKey || event.srcEvent.metaKey)) {
    // create a new range item when dragging with ctrl key down
    this._onDragStartAddItem(event);
  }
};
/**
 * Start creating a new range item by dragging.
 * @param {Event} event
 * @private
 */


ItemSet.prototype._onDragStartAddItem = function (event) {
  var xAbs;
  var x;
  var snap = this.options.snap || null;

  if (this.options.rtl) {
    xAbs = util.getAbsoluteRight(this.dom.frame);
    x = xAbs - event.center.x + 10; // plus 10 to compensate for the drag starting as soon as you've moved 10px
  } else {
    xAbs = util.getAbsoluteLeft(this.dom.frame);
    x = event.center.x - xAbs - 10; // minus 10 to compensate for the drag starting as soon as you've moved 10px
  }

  var time = this.body.util.toTime(x);
  var scale = this.body.util.getScale();
  var step = this.body.util.getStep();
  var start = snap ? snap(time, scale, step) : time;
  var end = start;
  var itemData = {
    type: 'range',
    start: start,
    end: end,
    content: 'new item'
  };
  var id = util.randomUUID();
  itemData[this.itemsData._fieldId] = id;
  var group = this.groupFromTarget(event);

  if (group) {
    itemData.group = group.groupId;
  }

  var newItem = new RangeItem_1(itemData, this.conversion, this.options);
  newItem.id = id; // TODO: not so nice setting id afterwards

  newItem.data = this._cloneItemData(itemData);

  this._addItem(newItem);

  this.touchParams.selectedItem = newItem;
  var props = {
    item: newItem,
    initialX: event.center.x,
    data: newItem.data
  };

  if (this.options.rtl) {
    props.dragLeft = true;
  } else {
    props.dragRight = true;
  }

  this.touchParams.itemProps = [props];
  event.stopPropagation();
};
/**
 * Drag selected items
 * @param {Event} event
 * @private
 */


ItemSet.prototype._onDrag = function (event) {
  // deactivate tooltip window
  this.clearPopupTimer();

  if (this.popup != null) {
    this.popup.hide();
  }

  if (this.touchParams.itemProps) {
    event.stopPropagation();
    var me = this;
    var snap = this.options.snap || null;
    var xOffset;

    if (this.options.rtl) {
      xOffset = this.body.dom.root.offsetLeft + this.body.domProps.right.width;
    } else {
      xOffset = this.body.dom.root.offsetLeft + this.body.domProps.left.width;
    }

    var scale = this.body.util.getScale();
    var step = this.body.util.getStep(); //only calculate the new group for the item that's actually dragged

    var selectedItem = this.touchParams.selectedItem;
    var updateGroupAllowed = (this.options.editable.overrideItems || selectedItem.editable == null) && this.options.editable.updateGroup || !this.options.editable.overrideItems && selectedItem.editable != null && selectedItem.editable.updateGroup;
    var newGroupBase = null;

    if (updateGroupAllowed && selectedItem) {
      if (selectedItem.data.group != undefined) {
        // drag from one group to another
        var group = me.groupFromTarget(event);

        if (group) {
          //we know the offset for all items, so the new group for all items
          //will be relative to this one.
          newGroupBase = this._getGroupIndex(group.groupId);
        }
      }
    } // move


    this.touchParams.itemProps.forEach(function (props) {
      var current = me.body.util.toTime(event.center.x - xOffset);
      var initial = me.body.util.toTime(props.initialX - xOffset);
      var offset;
      var initialStart;
      var initialEnd;
      var start;
      var end;

      if (this.options.rtl) {
        offset = -(current - initial); // ms
      } else {
        offset = current - initial; // ms
      }

      var itemData = this._cloneItemData(props.item.data); // clone the data


      if (props.item.editable != null && !props.item.editable.updateTime && !props.item.editable.updateGroup && !me.options.editable.overrideItems) {
        return;
      }

      var updateTimeAllowed = (this.options.editable.overrideItems || selectedItem.editable == null) && this.options.editable.updateTime || !this.options.editable.overrideItems && selectedItem.editable != null && selectedItem.editable.updateTime;

      if (updateTimeAllowed) {
        if (props.dragLeft) {
          // drag left side of a range item
          if (this.options.rtl) {
            if (itemData.end != undefined) {
              initialEnd = util.convert(props.data.end, 'Date');
              end = new Date(initialEnd.valueOf() + offset); // TODO: pass a Moment instead of a Date to snap(). (Breaking change)

              itemData.end = snap ? snap(end, scale, step) : end;
            }
          } else {
            if (itemData.start != undefined) {
              initialStart = util.convert(props.data.start, 'Date');
              start = new Date(initialStart.valueOf() + offset); // TODO: pass a Moment instead of a Date to snap(). (Breaking change)

              itemData.start = snap ? snap(start, scale, step) : start;
            }
          }
        } else if (props.dragRight) {
          // drag right side of a range item
          if (this.options.rtl) {
            if (itemData.start != undefined) {
              initialStart = util.convert(props.data.start, 'Date');
              start = new Date(initialStart.valueOf() + offset); // TODO: pass a Moment instead of a Date to snap(). (Breaking change)

              itemData.start = snap ? snap(start, scale, step) : start;
            }
          } else {
            if (itemData.end != undefined) {
              initialEnd = util.convert(props.data.end, 'Date');
              end = new Date(initialEnd.valueOf() + offset); // TODO: pass a Moment instead of a Date to snap(). (Breaking change)

              itemData.end = snap ? snap(end, scale, step) : end;
            }
          }
        } else {
          // drag both start and end
          if (itemData.start != undefined) {
            initialStart = util.convert(props.data.start, 'Date').valueOf();
            start = new Date(initialStart + offset);

            if (itemData.end != undefined) {
              initialEnd = util.convert(props.data.end, 'Date');
              var duration = initialEnd.valueOf() - initialStart.valueOf(); // TODO: pass a Moment instead of a Date to snap(). (Breaking change)

              itemData.start = snap ? snap(start, scale, step) : start;
              itemData.end = new Date(itemData.start.valueOf() + duration);
            } else {
              // TODO: pass a Moment instead of a Date to snap(). (Breaking change)
              itemData.start = snap ? snap(start, scale, step) : start;
            }
          }
        }
      }

      if (updateGroupAllowed && !props.dragLeft && !props.dragRight && newGroupBase != null) {
        if (itemData.group != undefined) {
          var newOffset = newGroupBase - props.groupOffset; //make sure we stay in bounds

          newOffset = Math.max(0, newOffset);
          newOffset = Math.min(me.groupIds.length - 1, newOffset);
          itemData.group = me.groupIds[newOffset];
        }
      } // confirm moving the item


      itemData = this._cloneItemData(itemData); // convert start and end to the correct type

      me.options.onMoving(itemData, function (itemData) {
        if (itemData) {
          props.item.setData(this._cloneItemData(itemData, 'Date'));
        }
      }.bind(this));
    }.bind(this));
    this.body.emitter.emit('_change');
  }
};
/**
 * Move an item to another group
 * @param {Item} item
 * @param {string | number} groupId
 * @private
 */


ItemSet.prototype._moveToGroup = function (item, groupId) {
  var group = this.groups[groupId];

  if (group && group.groupId != item.data.group) {
    var oldGroup = item.parent;
    oldGroup.remove(item);
    oldGroup.order();
    item.data.group = group.groupId;
    group.add(item);
    group.order();
  }
};
/**
 * End of dragging selected items
 * @param {Event} event
 * @private
 */


ItemSet.prototype._onDragEnd = function (event) {
  this.touchParams.itemIsDragging = false;

  if (this.touchParams.itemProps) {
    event.stopPropagation();
    var me = this;
    var dataset = this.itemsData.getDataSet();
    var itemProps = this.touchParams.itemProps;
    this.touchParams.itemProps = null;
    itemProps.forEach(function (props) {
      var id = props.item.id;
      var exists = me.itemsData.get(id, me.itemOptions) != null;

      if (!exists) {
        // add a new item
        me.options.onAdd(props.item.data, function (itemData) {
          me._removeItem(props.item); // remove temporary item


          if (itemData) {
            me.itemsData.getDataSet().add(itemData);
          } // force re-stacking of all items next redraw


          me.body.emitter.emit('_change');
        });
      } else {
        // update existing item
        var itemData = this._cloneItemData(props.item.data); // convert start and end to the correct type


        me.options.onMove(itemData, function (itemData) {
          if (itemData) {
            // apply changes
            itemData[dataset._fieldId] = id; // ensure the item contains its id (can be undefined)

            dataset.update(itemData);
          } else {
            // restore original values
            props.item.setData(props.data);
            me.body.emitter.emit('_change');
          }
        });
      }
    }.bind(this));
  }
};

ItemSet.prototype._onGroupClick = function (event) {
  var group = this.groupFromTarget(event);
  if (!group || !group.nestedGroups) return;
  var groupsData = this.groupsData.getDataSet();
  var nestingGroup = groupsData.get(group.groupId);

  if (nestingGroup.showNested == undefined) {
    nestingGroup.showNested = true;
  }

  nestingGroup.showNested = !nestingGroup.showNested;
  var nestedGroups = groupsData.get(group.nestedGroups).map(function (nestedGroup) {
    nestedGroup.visible = nestingGroup.showNested;
    return nestedGroup;
  });
  groupsData.update(nestedGroups.concat(nestingGroup));

  if (nestingGroup.showNested) {
    util.removeClassName(group.dom.label, 'collapsed');
    util.addClassName(group.dom.label, 'expanded');
  } else {
    util.removeClassName(group.dom.label, 'expanded');
    var collapsedDirClassName = this.options.rtl ? 'collapsed-rtl' : 'collapsed';
    util.addClassName(group.dom.label, collapsedDirClassName);
  }
};

ItemSet.prototype._onGroupDragStart = function (event) {
  if (this.options.groupEditable.order) {
    this.groupTouchParams.group = this.groupFromTarget(event);

    if (this.groupTouchParams.group) {
      event.stopPropagation();
      this.groupTouchParams.originalOrder = this.groupsData.getIds({
        order: this.options.groupOrder
      });
    }
  }
};

ItemSet.prototype._onGroupDrag = function (event) {
  if (this.options.groupEditable.order && this.groupTouchParams.group) {
    event.stopPropagation();
    var groupsData = this.groupsData;

    if (this.groupsData instanceof DataView) {
      groupsData = this.groupsData.getDataSet();
    } // drag from one group to another


    var group = this.groupFromTarget(event); // try to avoid toggling when groups differ in height

    if (group && group.height != this.groupTouchParams.group.height) {
      var movingUp = group.top < this.groupTouchParams.group.top;
      var clientY = event.center ? event.center.y : event.clientY;
      var targetGroupTop = util.getAbsoluteTop(group.dom.foreground);
      var draggedGroupHeight = this.groupTouchParams.group.height;

      if (movingUp) {
        // skip swapping the groups when the dragged group is not below clientY afterwards
        if (targetGroupTop + draggedGroupHeight < clientY) {
          return;
        }
      } else {
        var targetGroupHeight = group.height; // skip swapping the groups when the dragged group is not below clientY afterwards

        if (targetGroupTop + targetGroupHeight - draggedGroupHeight > clientY) {
          return;
        }
      }
    }

    if (group && group != this.groupTouchParams.group) {
      var targetGroup = groupsData.get(group.groupId);
      var draggedGroup = groupsData.get(this.groupTouchParams.group.groupId); // switch groups

      if (draggedGroup && targetGroup) {
        this.options.groupOrderSwap(draggedGroup, targetGroup, groupsData);
        groupsData.update(draggedGroup);
        groupsData.update(targetGroup);
      } // fetch current order of groups


      var newOrder = groupsData.getIds({
        order: this.options.groupOrder
      }); // in case of changes since _onGroupDragStart

      if (!util.equalArray(newOrder, this.groupTouchParams.originalOrder)) {
        var origOrder = this.groupTouchParams.originalOrder;
        var draggedId = this.groupTouchParams.group.groupId;
        var numGroups = Math.min(origOrder.length, newOrder.length);
        var curPos = 0;
        var newOffset = 0;
        var orgOffset = 0;

        while (curPos < numGroups) {
          // as long as the groups are where they should be step down along the groups order
          while (curPos + newOffset < numGroups && curPos + orgOffset < numGroups && newOrder[curPos + newOffset] == origOrder[curPos + orgOffset]) {
            curPos++;
          } // all ok


          if (curPos + newOffset >= numGroups) {
            break;
          } // not all ok
          // if dragged group was move upwards everything below should have an offset


          if (newOrder[curPos + newOffset] == draggedId) {
            newOffset = 1;
          } // if dragged group was move downwards everything above should have an offset
          else if (origOrder[curPos + orgOffset] == draggedId) {
              orgOffset = 1;
            } // found a group (apart from dragged group) that has the wrong position -> switch with the 
            // group at the position where other one should be, fix index arrays and continue
            else {
                var slippedPosition = newOrder.indexOf(origOrder[curPos + orgOffset]);
                var switchGroup = groupsData.get(newOrder[curPos + newOffset]);
                var shouldBeGroup = groupsData.get(origOrder[curPos + orgOffset]);
                this.options.groupOrderSwap(switchGroup, shouldBeGroup, groupsData);
                groupsData.update(switchGroup);
                groupsData.update(shouldBeGroup);
                var switchGroupId = newOrder[curPos + newOffset];
                newOrder[curPos + newOffset] = origOrder[curPos + orgOffset];
                newOrder[slippedPosition] = switchGroupId;
                curPos++;
              }
        }
      }
    }
  }
};

ItemSet.prototype._onGroupDragEnd = function (event) {
  if (this.options.groupEditable.order && this.groupTouchParams.group) {
    event.stopPropagation(); // update existing group

    var me = this;
    var id = me.groupTouchParams.group.groupId;
    var dataset = me.groupsData.getDataSet();
    var groupData = util.extend({}, dataset.get(id)); // clone the data

    me.options.onMoveGroup(groupData, function (groupData) {
      if (groupData) {
        // apply changes
        groupData[dataset._fieldId] = id; // ensure the group contains its id (can be undefined)

        dataset.update(groupData);
      } else {
        // fetch current order of groups
        var newOrder = dataset.getIds({
          order: me.options.groupOrder
        }); // restore original order

        if (!util.equalArray(newOrder, me.groupTouchParams.originalOrder)) {
          var origOrder = me.groupTouchParams.originalOrder;
          var numGroups = Math.min(origOrder.length, newOrder.length);
          var curPos = 0;

          while (curPos < numGroups) {
            // as long as the groups are where they should be step down along the groups order
            while (curPos < numGroups && newOrder[curPos] == origOrder[curPos]) {
              curPos++;
            } // all ok


            if (curPos >= numGroups) {
              break;
            } // found a group that has the wrong position -> switch with the
            // group at the position where other one should be, fix index arrays and continue


            var slippedPosition = newOrder.indexOf(origOrder[curPos]);
            var switchGroup = dataset.get(newOrder[curPos]);
            var shouldBeGroup = dataset.get(origOrder[curPos]);
            me.options.groupOrderSwap(switchGroup, shouldBeGroup, dataset);
            dataset.update(switchGroup);
            dataset.update(shouldBeGroup);
            var switchGroupId = newOrder[curPos];
            newOrder[curPos] = origOrder[curPos];
            newOrder[slippedPosition] = switchGroupId;
            curPos++;
          }
        }
      }
    });
    me.body.emitter.emit('groupDragged', {
      groupId: id
    });
  }
};
/**
 * Handle selecting/deselecting an item when tapping it
 * @param {Event} event
 * @private
 */


ItemSet.prototype._onSelectItem = function (event) {
  if (!this.options.selectable) return;
  var ctrlKey = event.srcEvent && (event.srcEvent.ctrlKey || event.srcEvent.metaKey);
  var shiftKey = event.srcEvent && event.srcEvent.shiftKey;

  if (ctrlKey || shiftKey) {
    this._onMultiSelectItem(event);

    return;
  }

  var oldSelection = this.getSelection();
  var item = this.itemFromTarget(event);
  var selection = item ? [item.id] : [];
  this.setSelection(selection);
  var newSelection = this.getSelection(); // emit a select event,
  // except when old selection is empty and new selection is still empty

  if (newSelection.length > 0 || oldSelection.length > 0) {
    this.body.emitter.emit('select', {
      items: newSelection,
      event: event
    });
  }
};
/**
 * Handle hovering an item
 * @param {Event} event
 * @private
 */


ItemSet.prototype._onMouseOver = function (event) {
  var item = this.itemFromTarget(event);
  if (!item) return; // Item we just left

  var related = this.itemFromRelatedTarget(event);

  if (item === related) {
    // We haven't changed item, just element in the item
    return;
  }

  var title = item.getTitle();

  if (this.options.showTooltips && title) {
    if (this.popup == null) {
      this.popup = new Popup(this.body.dom.root, this.options.tooltip.overflowMethod || 'flip');
    }

    this.popup.setText(title);
    var container = this.body.dom.centerContainer;
    this.popup.setPosition(event.clientX - util.getAbsoluteLeft(container) + container.offsetLeft, event.clientY - util.getAbsoluteTop(container) + container.offsetTop);
    this.setPopupTimer(this.popup);
  } else {
    // Hovering over item without a title, hide popup
    // Needed instead of _just_ in _onMouseOut due to #2572
    this.clearPopupTimer();

    if (this.popup != null) {
      this.popup.hide();
    }
  }

  this.body.emitter.emit('itemover', {
    item: item.id,
    event: event
  });
};

ItemSet.prototype._onMouseOut = function (event) {
  var item = this.itemFromTarget(event);
  if (!item) return; // Item we are going to

  var related = this.itemFromRelatedTarget(event);

  if (item === related) {
    // We aren't changing item, just element in the item
    return;
  }

  this.clearPopupTimer();

  if (this.popup != null) {
    this.popup.hide();
  }

  this.body.emitter.emit('itemout', {
    item: item.id,
    event: event
  });
};

ItemSet.prototype._onMouseMove = function (event) {
  var item = this.itemFromTarget(event);
  if (!item) return;

  if (this.popupTimer != null) {
    // restart timer
    this.setPopupTimer(this.popup);
  }

  if (this.options.showTooltips && this.options.tooltip.followMouse) {
    if (this.popup) {
      if (!this.popup.hidden) {
        var container = this.body.dom.centerContainer;
        this.popup.setPosition(event.clientX - util.getAbsoluteLeft(container) + container.offsetLeft, event.clientY - util.getAbsoluteTop(container) + container.offsetTop);
        this.popup.show(); // Redraw
      }
    }
  }
};
/**
 * Handle mousewheel
 * @param {Event}  event   The event
 * @private
 */


ItemSet.prototype._onMouseWheel = function (event) {
  if (this.touchParams.itemIsDragging) {
    this._onDragEnd(event);
  }
};
/**
 * Handle updates of an item on double tap
 * @param {vis.Item}  item   The item
 * @private
 */


ItemSet.prototype._onUpdateItem = function (item) {
  if (!this.options.selectable) return;
  if (!this.options.editable.add) return;
  var me = this;

  if (item) {
    // execute async handler to update the item (or cancel it)
    var itemData = me.itemsData.get(item.id); // get a clone of the data from the dataset

    this.options.onUpdate(itemData, function (itemData) {
      if (itemData) {
        me.itemsData.getDataSet().update(itemData);
      }
    });
  }
};
/**
 * Handle drop event of data on item
 * Only called when `objectData.target === 'item'.
 * @param {Event} event The event 
 * @private
 */


ItemSet.prototype._onDropObjectOnItem = function (event) {
  var item = this.itemFromTarget(event);
  var objectData = JSON.parse(event.dataTransfer.getData("text"));
  this.options.onDropObjectOnItem(objectData, item);
};
/**
 * Handle creation of an item on double tap or drop of a drag event
 * @param {Event} event   The event
 * @private
 */


ItemSet.prototype._onAddItem = function (event) {
  if (!this.options.selectable) return;
  if (!this.options.editable.add) return;
  var me = this;
  var snap = this.options.snap || null;
  var xAbs;
  var x; // add item

  if (this.options.rtl) {
    xAbs = util.getAbsoluteRight(this.dom.frame);
    x = xAbs - event.center.x;
  } else {
    xAbs = util.getAbsoluteLeft(this.dom.frame);
    x = event.center.x - xAbs;
  } // var xAbs = util.getAbsoluteLeft(this.dom.frame);
  // var x = event.center.x - xAbs;


  var start = this.body.util.toTime(x);
  var scale = this.body.util.getScale();
  var step = this.body.util.getStep();
  var end;
  var newItemData;

  if (event.type == 'drop') {
    newItemData = JSON.parse(event.dataTransfer.getData("text"));
    newItemData.content = newItemData.content ? newItemData.content : 'new item';
    newItemData.start = newItemData.start ? newItemData.start : snap ? snap(start, scale, step) : start;
    newItemData.type = newItemData.type || 'box';
    newItemData[this.itemsData._fieldId] = newItemData.id || util.randomUUID();

    if (newItemData.type == 'range' && !newItemData.end) {
      end = this.body.util.toTime(x + this.props.width / 5);
      newItemData.end = snap ? snap(end, scale, step) : end;
    }
  } else {
    newItemData = {
      start: snap ? snap(start, scale, step) : start,
      content: 'new item'
    };
    newItemData[this.itemsData._fieldId] = util.randomUUID(); // when default type is a range, add a default end date to the new item

    if (this.options.type === 'range') {
      end = this.body.util.toTime(x + this.props.width / 5);
      newItemData.end = snap ? snap(end, scale, step) : end;
    }
  }

  var group = this.groupFromTarget(event);

  if (group) {
    newItemData.group = group.groupId;
  } // execute async handler to customize (or cancel) adding an item


  newItemData = this._cloneItemData(newItemData); // convert start and end to the correct type

  this.options.onAdd(newItemData, function (item) {
    if (item) {
      me.itemsData.getDataSet().add(item);

      if (event.type == 'drop') {
        me.setSelection([item.id]);
      } // TODO: need to trigger a redraw?

    }
  });
};
/**
 * Handle selecting/deselecting multiple items when holding an item
 * @param {Event} event
 * @private
 */


ItemSet.prototype._onMultiSelectItem = function (event) {
  if (!this.options.selectable) return;
  var item = this.itemFromTarget(event);

  if (item) {
    // multi select items (if allowed)
    var selection = this.options.multiselect ? this.getSelection() // take current selection
    : []; // deselect current selection

    var shiftKey = event.srcEvent && event.srcEvent.shiftKey || false;

    if (shiftKey && this.options.multiselect) {
      // select all items between the old selection and the tapped item
      var itemGroup = this.itemsData.get(item.id).group; // when filtering get the group of the last selected item

      var lastSelectedGroup = undefined;

      if (this.options.multiselectPerGroup) {
        if (selection.length > 0) {
          lastSelectedGroup = this.itemsData.get(selection[0]).group;
        }
      } // determine the selection range


      if (!this.options.multiselectPerGroup || lastSelectedGroup == undefined || lastSelectedGroup == itemGroup) {
        selection.push(item.id);
      }

      var range = ItemSet._getItemRange(this.itemsData.get(selection, this.itemOptions));

      if (!this.options.multiselectPerGroup || lastSelectedGroup == itemGroup) {
        // select all items within the selection range
        selection = [];

        for (var id in this.items) {
          if (this.items.hasOwnProperty(id)) {
            var _item = this.items[id];
            var start = _item.data.start;
            var end = _item.data.end !== undefined ? _item.data.end : start;

            if (start >= range.min && end <= range.max && (!this.options.multiselectPerGroup || lastSelectedGroup == this.itemsData.get(_item.id).group) && !(_item instanceof BackgroundItem_1)) {
              selection.push(_item.id); // do not use id but item.id, id itself is stringified
            }
          }
        }
      }
    } else {
      // add/remove this item from the current selection
      var index = selection.indexOf(item.id);

      if (index == -1) {
        // item is not yet selected -> select it
        selection.push(item.id);
      } else {
        // item is already selected -> deselect it
        selection.splice(index, 1);
      }
    }

    this.setSelection(selection);
    this.body.emitter.emit('select', {
      items: this.getSelection(),
      event: event
    });
  }
};
/**
 * Calculate the time range of a list of items
 * @param {Array.<Object>} itemsData
 * @return {{min: Date, max: Date}} Returns the range of the provided items
 * @private
 */


ItemSet._getItemRange = function (itemsData) {
  var max = null;
  var min = null;
  itemsData.forEach(function (data) {
    if (min == null || data.start < min) {
      min = data.start;
    }

    if (data.end != undefined) {
      if (max == null || data.end > max) {
        max = data.end;
      }
    } else {
      if (max == null || data.start > max) {
        max = data.start;
      }
    }
  });
  return {
    min: min,
    max: max
  };
};
/**
 * Find an item from an element:
 * searches for the attribute 'timeline-item' in the element's tree
 * @param {HTMLElement} element
 * @return {Item | null} item
 */


ItemSet.prototype.itemFromElement = function (element) {
  var cur = element;

  while (cur) {
    if (cur.hasOwnProperty('timeline-item')) {
      return cur['timeline-item'];
    }

    cur = cur.parentNode;
  }

  return null;
};
/**
 * Find an item from an event target:
 * searches for the attribute 'timeline-item' in the event target's element tree
 * @param {Event} event
 * @return {Item | null} item
 */


ItemSet.prototype.itemFromTarget = function (event) {
  return this.itemFromElement(event.target);
};
/**
 * Find an item from an event's related target:
 * searches for the attribute 'timeline-item' in the related target's element tree
 * @param {Event} event
 * @return {Item | null} item
 */


ItemSet.prototype.itemFromRelatedTarget = function (event) {
  return this.itemFromElement(event.relatedTarget);
};
/**
 * Find the Group from an event target:
 * searches for the attribute 'timeline-group' in the event target's element tree
 * @param {Event} event
 * @return {Group | null} group
 */


ItemSet.prototype.groupFromTarget = function (event) {
  var clientY = event.center ? event.center.y : event.clientY;
  var groupIds = this.groupIds;

  if (groupIds.length <= 0 && this.groupsData) {
    groupIds = this.groupsData.getIds({
      order: this.options.groupOrder
    });
  }

  for (var i = 0; i < groupIds.length; i++) {
    var groupId = groupIds[i];
    var group = this.groups[groupId];
    var foreground = group.dom.foreground;
    var top = util.getAbsoluteTop(foreground);

    if (clientY >= top && clientY < top + foreground.offsetHeight) {
      return group;
    }

    if (this.options.orientation.item === 'top') {
      if (i === this.groupIds.length - 1 && clientY > top) {
        return group;
      }
    } else {
      if (i === 0 && clientY < top + foreground.offset) {
        return group;
      }
    }
  }

  return null;
};
/**
 * Find the ItemSet from an event target:
 * searches for the attribute 'timeline-itemset' in the event target's element tree
 * @param {Event} event
 * @return {ItemSet | null} item
 */


ItemSet.itemSetFromTarget = function (event) {
  var target = event.target;

  while (target) {
    if (target.hasOwnProperty('timeline-itemset')) {
      return target['timeline-itemset'];
    }

    target = target.parentNode;
  }

  return null;
};
/**
 * Clone the data of an item, and "normalize" it: convert the start and end date
 * to the type (Date, Moment, ...) configured in the DataSet. If not configured,
 * start and end are converted to Date.
 * @param {Object} itemData, typically `item.data`
 * @param {string} [type]  Optional Date type. If not provided, the type from the DataSet is taken
 * @return {Object} The cloned object
 * @private
 */


ItemSet.prototype._cloneItemData = function (itemData, type) {
  var clone = util.extend({}, itemData);

  if (!type) {
    // convert start and end date to the type (Date, Moment, ...) configured in the DataSet
    type = this.itemsData.getDataSet()._options.type;
  }

  if (clone.start != undefined) {
    clone.start = util.convert(clone.start, type && type.start || 'Date');
  }

  if (clone.end != undefined) {
    clone.end = util.convert(clone.end, type && type.end || 'Date');
  }

  return clone;
};

var errorFound = false;
var allOptions;
var printStyle = 'background: #FFeeee; color: #dd0000';
/**
 *  Used to validate options.
 */

var Validator =
/*#__PURE__*/
function () {
  /**
   * @ignore
   */
  function Validator() {
    _classCallCheck$1(this, Validator);
  }
  /**
   * Main function to be called
   * @param {Object} options
   * @param {Object} referenceOptions
   * @param {Object} subObject
   * @returns {boolean}
   * @static
   */


  _createClass$1(Validator, null, [{
    key: "validate",
    value: function validate(options, referenceOptions, subObject) {
      errorFound = false;
      allOptions = referenceOptions;
      var usedOptions = referenceOptions;

      if (subObject !== undefined) {
        usedOptions = referenceOptions[subObject];
      }

      Validator.parse(options, usedOptions, []);
      return errorFound;
    }
    /**
     * Will traverse an object recursively and check every value
     * @param {Object} options
     * @param {Object} referenceOptions
     * @param {array} path    | where to look for the actual option
     * @static
     */

  }, {
    key: "parse",
    value: function parse(options, referenceOptions, path) {
      for (var option in options) {
        if (options.hasOwnProperty(option)) {
          Validator.check(option, options, referenceOptions, path);
        }
      }
    }
    /**
     * Check every value. If the value is an object, call the parse function on that object.
     * @param {string} option
     * @param {Object} options
     * @param {Object} referenceOptions
     * @param {array} path    | where to look for the actual option
     * @static
     */

  }, {
    key: "check",
    value: function check(option, options, referenceOptions, path) {
      if (referenceOptions[option] === undefined && referenceOptions.__any__ === undefined) {
        Validator.getSuggestion(option, referenceOptions, path);
        return;
      }

      var referenceOption = option;
      var is_object = true;

      if (referenceOptions[option] === undefined && referenceOptions.__any__ !== undefined) {
        // NOTE: This only triggers if the __any__ is in the top level of the options object.
        //       THAT'S A REALLY BAD PLACE TO ALLOW IT!!!!
        // TODO: Examine if needed, remove if possible
        // __any__ is a wildcard. Any value is accepted and will be further analysed by reference.
        referenceOption = '__any__'; // if the any-subgroup is not a predefined object in the configurator,
        // we do not look deeper into the object.

        is_object = Validator.getType(options[option]) === 'object';
      }

      var refOptionObj = referenceOptions[referenceOption];

      if (is_object && refOptionObj.__type__ !== undefined) {
        refOptionObj = refOptionObj.__type__;
      }

      Validator.checkFields(option, options, referenceOptions, referenceOption, refOptionObj, path);
    }
    /**
     *
     * @param {string}  option           | the option property
     * @param {Object}  options          | The supplied options object
     * @param {Object}  referenceOptions | The reference options containing all options and their allowed formats
     * @param {string}  referenceOption  | Usually this is the same as option, except when handling an __any__ tag.
     * @param {string}  refOptionObj     | This is the type object from the reference options
     * @param {Array}   path             | where in the object is the option
     * @static
     */

  }, {
    key: "checkFields",
    value: function checkFields(option, options, referenceOptions, referenceOption, refOptionObj, path) {
      var log = function log(message) {
        console.log('%c' + message + Validator.printLocation(path, option), printStyle);
      };

      var optionType = Validator.getType(options[option]);
      var refOptionType = refOptionObj[optionType];

      if (refOptionType !== undefined) {
        // if the type is correct, we check if it is supposed to be one of a few select values
        if (Validator.getType(refOptionType) === 'array' && refOptionType.indexOf(options[option]) === -1) {
          log('Invalid option detected in "' + option + '".' + ' Allowed values are:' + Validator.print(refOptionType) + ' not "' + options[option] + '". ');
          errorFound = true;
        } else if (optionType === 'object' && referenceOption !== "__any__") {
          path = util.copyAndExtendArray(path, option);
          Validator.parse(options[option], referenceOptions[referenceOption], path);
        }
      } else if (refOptionObj['any'] === undefined) {
        // type of the field is incorrect and the field cannot be any
        log('Invalid type received for "' + option + '". Expected: ' + Validator.print(Object.keys(refOptionObj)) + '. Received [' + optionType + '] "' + options[option] + '"');
        errorFound = true;
      }
    }
    /**
     *
     * @param {Object|boolean|number|string|Array.<number>|Date|Node|Moment|undefined|null} object
     * @returns {string}
     * @static
     */

  }, {
    key: "getType",
    value: function getType(object) {
      var type = _typeof$1(object);

      if (type === 'object') {
        if (object === null) {
          return 'null';
        }

        if (object instanceof Boolean) {
          return 'boolean';
        }

        if (object instanceof Number) {
          return 'number';
        }

        if (object instanceof String) {
          return 'string';
        }

        if (Array.isArray(object)) {
          return 'array';
        }

        if (object instanceof Date) {
          return 'date';
        }

        if (object.nodeType !== undefined) {
          return 'dom';
        }

        if (object._isAMomentObject === true) {
          return 'moment';
        }

        return 'object';
      } else if (type === 'number') {
        return 'number';
      } else if (type === 'boolean') {
        return 'boolean';
      } else if (type === 'string') {
        return 'string';
      } else if (type === undefined) {
        return 'undefined';
      }

      return type;
    }
    /**
     * @param {string} option
     * @param {Object} options
     * @param {Array.<string>} path
     * @static
     */

  }, {
    key: "getSuggestion",
    value: function getSuggestion(option, options, path) {
      var localSearch = Validator.findInOptions(option, options, path, false);
      var globalSearch = Validator.findInOptions(option, allOptions, [], true);
      var localSearchThreshold = 8;
      var globalSearchThreshold = 4;
      var msg;

      if (localSearch.indexMatch !== undefined) {
        msg = ' in ' + Validator.printLocation(localSearch.path, option, '') + 'Perhaps it was incomplete? Did you mean: "' + localSearch.indexMatch + '"?\n\n';
      } else if (globalSearch.distance <= globalSearchThreshold && localSearch.distance > globalSearch.distance) {
        msg = ' in ' + Validator.printLocation(localSearch.path, option, '') + 'Perhaps it was misplaced? Matching option found at: ' + Validator.printLocation(globalSearch.path, globalSearch.closestMatch, '');
      } else if (localSearch.distance <= localSearchThreshold) {
        msg = '. Did you mean "' + localSearch.closestMatch + '"?' + Validator.printLocation(localSearch.path, option);
      } else {
        msg = '. Did you mean one of these: ' + Validator.print(Object.keys(options)) + Validator.printLocation(path, option);
      }

      console.log('%cUnknown option detected: "' + option + '"' + msg, printStyle);
      errorFound = true;
    }
    /**
     * traverse the options in search for a match.
     * @param {string} option
     * @param {Object} options
     * @param {Array} path    | where to look for the actual option
     * @param {boolean} [recursive=false]
     * @returns {{closestMatch: string, path: Array, distance: number}}
     * @static
     */

  }, {
    key: "findInOptions",
    value: function findInOptions(option, options, path) {
      var recursive = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;
      var min = 1e9;
      var closestMatch = '';
      var closestMatchPath = [];
      var lowerCaseOption = option.toLowerCase();
      var indexMatch = undefined;

      for (var op in options) {
        // eslint-disable-line guard-for-in
        var distance = void 0;

        if (options[op].__type__ !== undefined && recursive === true) {
          var result = Validator.findInOptions(option, options[op], util.copyAndExtendArray(path, op));

          if (min > result.distance) {
            closestMatch = result.closestMatch;
            closestMatchPath = result.path;
            min = result.distance;
            indexMatch = result.indexMatch;
          }
        } else {
          if (op.toLowerCase().indexOf(lowerCaseOption) !== -1) {
            indexMatch = op;
          }

          distance = Validator.levenshteinDistance(option, op);

          if (min > distance) {
            closestMatch = op;
            closestMatchPath = util.copyArray(path);
            min = distance;
          }
        }
      }

      return {
        closestMatch: closestMatch,
        path: closestMatchPath,
        distance: min,
        indexMatch: indexMatch
      };
    }
    /**
     * @param {Array.<string>} path
     * @param {Object} option
     * @param {string} prefix
     * @returns {String}
     * @static
     */

  }, {
    key: "printLocation",
    value: function printLocation(path, option) {
      var prefix = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 'Problem value found at: \n';
      var str = '\n\n' + prefix + 'options = {\n';

      for (var i = 0; i < path.length; i++) {
        for (var j = 0; j < i + 1; j++) {
          str += '  ';
        }

        str += path[i] + ': {\n';
      }

      for (var _j = 0; _j < path.length + 1; _j++) {
        str += '  ';
      }

      str += option + '\n';

      for (var _i = 0; _i < path.length + 1; _i++) {
        for (var _j2 = 0; _j2 < path.length - _i; _j2++) {
          str += '  ';
        }

        str += '}\n';
      }

      return str + '\n\n';
    }
    /**
     * @param {Object} options
     * @returns {String}
     * @static
     */

  }, {
    key: "print",
    value: function print(options) {
      return JSON.stringify(options).replace(/(\")|(\[)|(\])|(,"__type__")/g, "").replace(/(\,)/g, ', ');
    }
    /**
     *  Compute the edit distance between the two given strings
     * http://en.wikibooks.org/wiki/Algorithm_Implementation/Strings/Levenshtein_distance#JavaScript
     *
     * Copyright (c) 2011 Andrei Mackenzie
     *
     * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
     *
     * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
     *
     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     *
     * @param {string} a
     * @param {string} b
     * @returns {Array.<Array.<number>>}}
     * @static
     */

  }, {
    key: "levenshteinDistance",
    value: function levenshteinDistance(a, b) {
      if (a.length === 0) return b.length;
      if (b.length === 0) return a.length;
      var matrix = []; // increment along the first column of each row

      var i;

      for (i = 0; i <= b.length; i++) {
        matrix[i] = [i];
      } // increment each column in the first row


      var j;

      for (j = 0; j <= a.length; j++) {
        matrix[0][j] = j;
      } // Fill in the rest of the matrix


      for (i = 1; i <= b.length; i++) {
        for (j = 1; j <= a.length; j++) {
          if (b.charAt(i - 1) == a.charAt(j - 1)) {
            matrix[i][j] = matrix[i - 1][j - 1];
          } else {
            matrix[i][j] = Math.min(matrix[i - 1][j - 1] + 1, // substitution
            Math.min(matrix[i][j - 1] + 1, // insertion
            matrix[i - 1][j] + 1)); // deletion
          }
        }
      }

      return matrix[b.length][a.length];
    }
  }]);

  return Validator;
}();

var Validator$1 = /*#__PURE__*/Object.freeze({
  Validator: Validator,
  printStyle: printStyle
});

/**
 * This object contains all possible options. It will check if the types are correct, if required if the option is one
 * of the allowed values.
 *
 * __any__ means that the name of the property does not matter.
 * __type__ is a required field for all objects and contains the allowed types of all objects
 */
var string = 'string';
var bool = 'boolean';
var number = 'number';
var array = 'array';
var date = 'date';
var object = 'object'; // should only be in a __type__ property

var dom = 'dom';
var moment$4 = 'moment';
var any = 'any';
var allOptions$1 = {
  configure: {
    enabled: {
      'boolean': bool
    },
    filter: {
      'boolean': bool,
      'function': 'function'
    },
    container: {
      dom: dom
    },
    __type__: {
      object: object,
      'boolean': bool,
      'function': 'function'
    }
  },
  //globals :
  align: {
    string: string
  },
  alignCurrentTime: {
    string: string,
    'undefined': 'undefined'
  },
  rtl: {
    'boolean': bool,
    'undefined': 'undefined'
  },
  rollingMode: {
    follow: {
      'boolean': bool
    },
    offset: {
      number: number,
      'undefined': 'undefined'
    },
    __type__: {
      object: object
    }
  },
  onTimeout: {
    timeoutMs: {
      number: number
    },
    callback: {
      'function': 'function'
    },
    __type__: {
      object: object
    }
  },
  verticalScroll: {
    'boolean': bool,
    'undefined': 'undefined'
  },
  horizontalScroll: {
    'boolean': bool,
    'undefined': 'undefined'
  },
  autoResize: {
    'boolean': bool
  },
  throttleRedraw: {
    number: number
  },
  // TODO: DEPRICATED see https://github.com/almende/vis/issues/2511
  clickToUse: {
    'boolean': bool
  },
  dataAttributes: {
    string: string,
    array: array
  },
  editable: {
    add: {
      'boolean': bool,
      'undefined': 'undefined'
    },
    remove: {
      'boolean': bool,
      'undefined': 'undefined'
    },
    updateGroup: {
      'boolean': bool,
      'undefined': 'undefined'
    },
    updateTime: {
      'boolean': bool,
      'undefined': 'undefined'
    },
    overrideItems: {
      'boolean': bool,
      'undefined': 'undefined'
    },
    __type__: {
      'boolean': bool,
      object: object
    }
  },
  end: {
    number: number,
    date: date,
    string: string,
    moment: moment$4
  },
  format: {
    minorLabels: {
      millisecond: {
        string: string,
        'undefined': 'undefined'
      },
      second: {
        string: string,
        'undefined': 'undefined'
      },
      minute: {
        string: string,
        'undefined': 'undefined'
      },
      hour: {
        string: string,
        'undefined': 'undefined'
      },
      weekday: {
        string: string,
        'undefined': 'undefined'
      },
      day: {
        string: string,
        'undefined': 'undefined'
      },
      week: {
        string: string,
        'undefined': 'undefined'
      },
      month: {
        string: string,
        'undefined': 'undefined'
      },
      quarter: {
        string: string,
        'undefined': 'undefined'
      },
      year: {
        string: string,
        'undefined': 'undefined'
      },
      __type__: {
        object: object,
        'function': 'function'
      }
    },
    majorLabels: {
      millisecond: {
        string: string,
        'undefined': 'undefined'
      },
      second: {
        string: string,
        'undefined': 'undefined'
      },
      minute: {
        string: string,
        'undefined': 'undefined'
      },
      hour: {
        string: string,
        'undefined': 'undefined'
      },
      weekday: {
        string: string,
        'undefined': 'undefined'
      },
      day: {
        string: string,
        'undefined': 'undefined'
      },
      week: {
        string: string,
        'undefined': 'undefined'
      },
      month: {
        string: string,
        'undefined': 'undefined'
      },
      quarter: {
        string: string,
        'undefined': 'undefined'
      },
      year: {
        string: string,
        'undefined': 'undefined'
      },
      __type__: {
        object: object,
        'function': 'function'
      }
    },
    __type__: {
      object: object
    }
  },
  moment: {
    'function': 'function'
  },
  groupHeightMode: {
    string: string
  },
  groupLabelDirection: {
    string: string
  },
  groupOrder: {
    string: string,
    'function': 'function'
  },
  groupEditable: {
    add: {
      'boolean': bool,
      'undefined': 'undefined'
    },
    remove: {
      'boolean': bool,
      'undefined': 'undefined'
    },
    order: {
      'boolean': bool,
      'undefined': 'undefined'
    },
    __type__: {
      'boolean': bool,
      object: object
    }
  },
  groupOrderSwap: {
    'function': 'function'
  },
  height: {
    string: string,
    number: number
  },
  hiddenDates: {
    start: {
      date: date,
      number: number,
      string: string,
      moment: moment$4
    },
    end: {
      date: date,
      number: number,
      string: string,
      moment: moment$4
    },
    repeat: {
      string: string
    },
    __type__: {
      object: object,
      array: array
    }
  },
  itemsAlwaysDraggable: {
    item: {
      'boolean': bool,
      'undefined': 'undefined'
    },
    range: {
      'boolean': bool,
      'undefined': 'undefined'
    },
    __type__: {
      'boolean': bool,
      object: object
    }
  },
  limitSize: {
    'boolean': bool
  },
  locale: {
    string: string
  },
  locales: {
    __any__: {
      any: any
    },
    __type__: {
      object: object
    }
  },
  margin: {
    axis: {
      number: number
    },
    item: {
      horizontal: {
        number: number,
        'undefined': 'undefined'
      },
      vertical: {
        number: number,
        'undefined': 'undefined'
      },
      __type__: {
        object: object,
        number: number
      }
    },
    __type__: {
      object: object,
      number: number
    }
  },
  max: {
    date: date,
    number: number,
    string: string,
    moment: moment$4
  },
  maxHeight: {
    number: number,
    string: string
  },
  maxMinorChars: {
    number: number
  },
  min: {
    date: date,
    number: number,
    string: string,
    moment: moment$4
  },
  minHeight: {
    number: number,
    string: string
  },
  moveable: {
    'boolean': bool
  },
  multiselect: {
    'boolean': bool
  },
  multiselectPerGroup: {
    'boolean': bool
  },
  onAdd: {
    'function': 'function'
  },
  onDropObjectOnItem: {
    'function': 'function'
  },
  onUpdate: {
    'function': 'function'
  },
  onMove: {
    'function': 'function'
  },
  onMoving: {
    'function': 'function'
  },
  onRemove: {
    'function': 'function'
  },
  onAddGroup: {
    'function': 'function'
  },
  onMoveGroup: {
    'function': 'function'
  },
  onRemoveGroup: {
    'function': 'function'
  },
  onInitialDrawComplete: {
    'function': 'function'
  },
  order: {
    'function': 'function'
  },
  orientation: {
    axis: {
      string: string,
      'undefined': 'undefined'
    },
    item: {
      string: string,
      'undefined': 'undefined'
    },
    __type__: {
      string: string,
      object: object
    }
  },
  selectable: {
    'boolean': bool
  },
  showCurrentTime: {
    'boolean': bool
  },
  showMajorLabels: {
    'boolean': bool
  },
  showMinorLabels: {
    'boolean': bool
  },
  stack: {
    'boolean': bool
  },
  stackSubgroups: {
    'boolean': bool
  },
  snap: {
    'function': 'function',
    'null': 'null'
  },
  start: {
    date: date,
    number: number,
    string: string,
    moment: moment$4
  },
  template: {
    'function': 'function'
  },
  loadingScreenTemplate: {
    'function': 'function'
  },
  groupTemplate: {
    'function': 'function'
  },
  visibleFrameTemplate: {
    string: string,
    'function': 'function'
  },
  showTooltips: {
    'boolean': bool
  },
  tooltip: {
    followMouse: {
      'boolean': bool
    },
    overflowMethod: {
      'string': ['cap', 'flip']
    },
    __type__: {
      object: object
    }
  },
  tooltipOnItemUpdateTime: {
    template: {
      'function': 'function'
    },
    __type__: {
      'boolean': bool,
      object: object
    }
  },
  timeAxis: {
    scale: {
      string: string,
      'undefined': 'undefined'
    },
    step: {
      number: number,
      'undefined': 'undefined'
    },
    __type__: {
      object: object
    }
  },
  type: {
    string: string
  },
  width: {
    string: string,
    number: number
  },
  zoomable: {
    'boolean': bool
  },
  zoomKey: {
    string: ['ctrlKey', 'altKey', 'metaKey', '']
  },
  zoomMax: {
    number: number
  },
  zoomMin: {
    number: number
  },
  __type__: {
    object: object
  }
};
var configureOptions = {
  global: {
    align: ['center', 'left', 'right'],
    alignCurrentTime: ['none', 'year', 'month', 'quarter', 'week', 'isoWeek', 'day', 'date', 'hour', 'minute', 'second'],
    direction: false,
    autoResize: true,
    clickToUse: false,
    // dataAttributes: ['all'], // FIXME: can be 'all' or string[]
    editable: {
      add: false,
      remove: false,
      updateGroup: false,
      updateTime: false
    },
    end: '',
    format: {
      minorLabels: {
        millisecond: 'SSS',
        second: 's',
        minute: 'HH:mm',
        hour: 'HH:mm',
        weekday: 'ddd D',
        day: 'D',
        week: 'w',
        month: 'MMM',
        quarter: '[Q]Q',
        year: 'YYYY'
      },
      majorLabels: {
        millisecond: 'HH:mm:ss',
        second: 'D MMMM HH:mm',
        minute: 'ddd D MMMM',
        hour: 'ddd D MMMM',
        weekday: 'MMMM YYYY',
        day: 'MMMM YYYY',
        week: 'MMMM YYYY',
        month: 'YYYY',
        quarter: 'YYYY',
        year: ''
      }
    },
    groupHeightMode: ['auto', 'fixed'],
    groupLabelDirection: ['horizontal', 'vertical'],
    //groupOrder: {string, 'function': 'function'},
    groupsDraggable: false,
    height: '',
    //hiddenDates: {object, array},
    locale: '',
    margin: {
      axis: [20, 0, 100, 1],
      item: {
        horizontal: [10, 0, 100, 1],
        vertical: [10, 0, 100, 1]
      }
    },
    max: '',
    maxHeight: '',
    maxMinorChars: [7, 0, 20, 1],
    min: '',
    minHeight: '',
    moveable: false,
    multiselect: false,
    multiselectPerGroup: false,
    //onAdd: {'function': 'function'},
    //onUpdate: {'function': 'function'},
    //onMove: {'function': 'function'},
    //onMoving: {'function': 'function'},
    //onRename: {'function': 'function'},
    //order: {'function': 'function'},
    orientation: {
      axis: ['both', 'bottom', 'top'],
      item: ['bottom', 'top']
    },
    selectable: true,
    showCurrentTime: false,
    showMajorLabels: true,
    showMinorLabels: true,
    stack: true,
    stackSubgroups: true,
    //snap: {'function': 'function', nada},
    start: '',
    //template: {'function': 'function'},
    //timeAxis: {
    //  scale: ['millisecond', 'second', 'minute', 'hour', 'weekday', 'day', 'week', 'month', 'quarter', 'year'],
    //  step: [1, 1, 10, 1]
    //},
    showTooltips: true,
    tooltip: {
      followMouse: false,
      overflowMethod: 'flip'
    },
    tooltipOnItemUpdateTime: false,
    type: ['box', 'point', 'range', 'background'],
    width: '100%',
    zoomable: true,
    zoomKey: ['ctrlKey', 'altKey', 'metaKey', ''],
    zoomMax: [315360000000000, 10, 315360000000000, 1],
    zoomMin: [10, 10, 315360000000000, 1]
  }
};

var optionsTimeline = /*#__PURE__*/Object.freeze({
  allOptions: allOptions$1,
  configureOptions: configureOptions
});

var htmlColors = {
  black: '#000000',
  navy: '#000080',
  darkblue: '#00008B',
  mediumblue: '#0000CD',
  blue: '#0000FF',
  darkgreen: '#006400',
  green: '#008000',
  teal: '#008080',
  darkcyan: '#008B8B',
  deepskyblue: '#00BFFF',
  darkturquoise: '#00CED1',
  mediumspringgreen: '#00FA9A',
  lime: '#00FF00',
  springgreen: '#00FF7F',
  aqua: '#00FFFF',
  cyan: '#00FFFF',
  midnightblue: '#191970',
  dodgerblue: '#1E90FF',
  lightseagreen: '#20B2AA',
  forestgreen: '#228B22',
  seagreen: '#2E8B57',
  darkslategray: '#2F4F4F',
  limegreen: '#32CD32',
  mediumseagreen: '#3CB371',
  turquoise: '#40E0D0',
  royalblue: '#4169E1',
  steelblue: '#4682B4',
  darkslateblue: '#483D8B',
  mediumturquoise: '#48D1CC',
  indigo: '#4B0082',
  darkolivegreen: '#556B2F',
  cadetblue: '#5F9EA0',
  cornflowerblue: '#6495ED',
  mediumaquamarine: '#66CDAA',
  dimgray: '#696969',
  slateblue: '#6A5ACD',
  olivedrab: '#6B8E23',
  slategray: '#708090',
  lightslategray: '#778899',
  mediumslateblue: '#7B68EE',
  lawngreen: '#7CFC00',
  chartreuse: '#7FFF00',
  aquamarine: '#7FFFD4',
  maroon: '#800000',
  purple: '#800080',
  olive: '#808000',
  gray: '#808080',
  skyblue: '#87CEEB',
  lightskyblue: '#87CEFA',
  blueviolet: '#8A2BE2',
  darkred: '#8B0000',
  darkmagenta: '#8B008B',
  saddlebrown: '#8B4513',
  darkseagreen: '#8FBC8F',
  lightgreen: '#90EE90',
  mediumpurple: '#9370D8',
  darkviolet: '#9400D3',
  palegreen: '#98FB98',
  darkorchid: '#9932CC',
  yellowgreen: '#9ACD32',
  sienna: '#A0522D',
  brown: '#A52A2A',
  darkgray: '#A9A9A9',
  lightblue: '#ADD8E6',
  greenyellow: '#ADFF2F',
  paleturquoise: '#AFEEEE',
  lightsteelblue: '#B0C4DE',
  powderblue: '#B0E0E6',
  firebrick: '#B22222',
  darkgoldenrod: '#B8860B',
  mediumorchid: '#BA55D3',
  rosybrown: '#BC8F8F',
  darkkhaki: '#BDB76B',
  silver: '#C0C0C0',
  mediumvioletred: '#C71585',
  indianred: '#CD5C5C',
  peru: '#CD853F',
  chocolate: '#D2691E',
  tan: '#D2B48C',
  lightgrey: '#D3D3D3',
  palevioletred: '#D87093',
  thistle: '#D8BFD8',
  orchid: '#DA70D6',
  goldenrod: '#DAA520',
  crimson: '#DC143C',
  gainsboro: '#DCDCDC',
  plum: '#DDA0DD',
  burlywood: '#DEB887',
  lightcyan: '#E0FFFF',
  lavender: '#E6E6FA',
  darksalmon: '#E9967A',
  violet: '#EE82EE',
  palegoldenrod: '#EEE8AA',
  lightcoral: '#F08080',
  khaki: '#F0E68C',
  aliceblue: '#F0F8FF',
  honeydew: '#F0FFF0',
  azure: '#F0FFFF',
  sandybrown: '#F4A460',
  wheat: '#F5DEB3',
  beige: '#F5F5DC',
  whitesmoke: '#F5F5F5',
  mintcream: '#F5FFFA',
  ghostwhite: '#F8F8FF',
  salmon: '#FA8072',
  antiquewhite: '#FAEBD7',
  linen: '#FAF0E6',
  lightgoldenrodyellow: '#FAFAD2',
  oldlace: '#FDF5E6',
  red: '#FF0000',
  fuchsia: '#FF00FF',
  magenta: '#FF00FF',
  deeppink: '#FF1493',
  orangered: '#FF4500',
  tomato: '#FF6347',
  hotpink: '#FF69B4',
  coral: '#FF7F50',
  darkorange: '#FF8C00',
  lightsalmon: '#FFA07A',
  orange: '#FFA500',
  lightpink: '#FFB6C1',
  pink: '#FFC0CB',
  gold: '#FFD700',
  peachpuff: '#FFDAB9',
  navajowhite: '#FFDEAD',
  moccasin: '#FFE4B5',
  bisque: '#FFE4C4',
  mistyrose: '#FFE4E1',
  blanchedalmond: '#FFEBCD',
  papayawhip: '#FFEFD5',
  lavenderblush: '#FFF0F5',
  seashell: '#FFF5EE',
  cornsilk: '#FFF8DC',
  lemonchiffon: '#FFFACD',
  floralwhite: '#FFFAF0',
  snow: '#FFFAFA',
  yellow: '#FFFF00',
  lightyellow: '#FFFFE0',
  ivory: '#FFFFF0',
  white: '#FFFFFF'
};
/**
 * @param {number} [pixelRatio=1]
 */

var ColorPicker =
/*#__PURE__*/
function () {
  /**
   * @param {number} [pixelRatio=1]
   */
  function ColorPicker() {
    var pixelRatio = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 1;

    _classCallCheck$1(this, ColorPicker);

    this.pixelRatio = pixelRatio;
    this.generated = false;
    this.centerCoordinates = {
      x: 289 / 2,
      y: 289 / 2
    };
    this.r = 289 * 0.49;
    this.color = {
      r: 255,
      g: 255,
      b: 255,
      a: 1.0
    };
    this.hueCircle = undefined;
    this.initialColor = {
      r: 255,
      g: 255,
      b: 255,
      a: 1.0
    };
    this.previousColor = undefined;
    this.applied = false; // bound by

    this.updateCallback = function () {};

    this.closeCallback = function () {}; // create all DOM elements


    this._create();
  }
  /**
   * this inserts the colorPicker into a div from the DOM
   * @param {Element} container
   */


  _createClass$1(ColorPicker, [{
    key: "insertTo",
    value: function insertTo(container) {
      if (this.hammer !== undefined) {
        this.hammer.destroy();
        this.hammer = undefined;
      }

      this.container = container;
      this.container.appendChild(this.frame);

      this._bindHammer();

      this._setSize();
    }
    /**
     * the callback is executed on apply and save. Bind it to the application
     * @param {function} callback
     */

  }, {
    key: "setUpdateCallback",
    value: function setUpdateCallback(callback) {
      if (typeof callback === 'function') {
        this.updateCallback = callback;
      } else {
        throw new Error("Function attempted to set as colorPicker update callback is not a function.");
      }
    }
    /**
     * the callback is executed on apply and save. Bind it to the application
     * @param {function} callback
     */

  }, {
    key: "setCloseCallback",
    value: function setCloseCallback(callback) {
      if (typeof callback === 'function') {
        this.closeCallback = callback;
      } else {
        throw new Error("Function attempted to set as colorPicker closing callback is not a function.");
      }
    }
    /**
     *
     * @param {string} color
     * @returns {String}
     * @private
     */

  }, {
    key: "_isColorString",
    value: function _isColorString(color) {
      if (typeof color === 'string') {
        return htmlColors[color];
      }
    }
    /**
     * Set the color of the colorPicker
     * Supported formats:
     * 'red'                   --> HTML color string
     * '#ffffff'               --> hex string
     * 'rgb(255,255,255)'      --> rgb string
     * 'rgba(255,255,255,1.0)' --> rgba string
     * {r:255,g:255,b:255}     --> rgb object
     * {r:255,g:255,b:255,a:1.0} --> rgba object
     * @param {string|Object} color
     * @param {boolean} [setInitial=true]
     */

  }, {
    key: "setColor",
    value: function setColor(color) {
      var setInitial = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;

      if (color === 'none') {
        return;
      }

      var rgba; // if a html color shorthand is used, convert to hex

      var htmlColor = this._isColorString(color);

      if (htmlColor !== undefined) {
        color = htmlColor;
      } // check format


      if (util.isString(color) === true) {
        if (util.isValidRGB(color) === true) {
          var rgbaArray = color.substr(4).substr(0, color.length - 5).split(',');
          rgba = {
            r: rgbaArray[0],
            g: rgbaArray[1],
            b: rgbaArray[2],
            a: 1.0
          };
        } else if (util.isValidRGBA(color) === true) {
          var _rgbaArray = color.substr(5).substr(0, color.length - 6).split(',');

          rgba = {
            r: _rgbaArray[0],
            g: _rgbaArray[1],
            b: _rgbaArray[2],
            a: _rgbaArray[3]
          };
        } else if (util.isValidHex(color) === true) {
          var rgbObj = util.hexToRGB(color);
          rgba = {
            r: rgbObj.r,
            g: rgbObj.g,
            b: rgbObj.b,
            a: 1.0
          };
        }
      } else {
        if (color instanceof Object) {
          if (color.r !== undefined && color.g !== undefined && color.b !== undefined) {
            var alpha = color.a !== undefined ? color.a : '1.0';
            rgba = {
              r: color.r,
              g: color.g,
              b: color.b,
              a: alpha
            };
          }
        }
      } // set color


      if (rgba === undefined) {
        throw new Error("Unknown color passed to the colorPicker. Supported are strings: rgb, hex, rgba. Object: rgb ({r:r,g:g,b:b,[a:a]}). Supplied: " + JSON.stringify(color));
      } else {
        this._setColor(rgba, setInitial);
      }
    }
    /**
     * this shows the color picker.
     * The hue circle is constructed once and stored.
     */

  }, {
    key: "show",
    value: function show() {
      if (this.closeCallback !== undefined) {
        this.closeCallback();
        this.closeCallback = undefined;
      }

      this.applied = false;
      this.frame.style.display = 'block';

      this._generateHueCircle();
    } // ------------------------------------------ PRIVATE ----------------------------- //

    /**
     * Hide the picker. Is called by the cancel button.
     * Optional boolean to store the previous color for easy access later on.
     * @param {boolean} [storePrevious=true]
     * @private
     */

  }, {
    key: "_hide",
    value: function _hide() {
      var _this = this;

      var storePrevious = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : true;

      // store the previous color for next time;
      if (storePrevious === true) {
        this.previousColor = util.extend({}, this.color);
      }

      if (this.applied === true) {
        this.updateCallback(this.initialColor);
      }

      this.frame.style.display = 'none'; // call the closing callback, restoring the onclick method.
      // this is in a setTimeout because it will trigger the show again before the click is done.

      setTimeout(function () {
        if (_this.closeCallback !== undefined) {
          _this.closeCallback();

          _this.closeCallback = undefined;
        }
      }, 0);
    }
    /**
     * bound to the save button. Saves and hides.
     * @private
     */

  }, {
    key: "_save",
    value: function _save() {
      this.updateCallback(this.color);
      this.applied = false;

      this._hide();
    }
    /**
     * Bound to apply button. Saves but does not close. Is undone by the cancel button.
     * @private
     */

  }, {
    key: "_apply",
    value: function _apply() {
      this.applied = true;
      this.updateCallback(this.color);

      this._updatePicker(this.color);
    }
    /**
     * load the color from the previous session.
     * @private
     */

  }, {
    key: "_loadLast",
    value: function _loadLast() {
      if (this.previousColor !== undefined) {
        this.setColor(this.previousColor, false);
      } else {
        alert("There is no last color to load...");
      }
    }
    /**
     * set the color, place the picker
     * @param {Object} rgba
     * @param {boolean} [setInitial=true]
     * @private
     */

  }, {
    key: "_setColor",
    value: function _setColor(rgba) {
      var setInitial = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;

      // store the initial color
      if (setInitial === true) {
        this.initialColor = util.extend({}, rgba);
      }

      this.color = rgba;
      var hsv = util.RGBToHSV(rgba.r, rgba.g, rgba.b);
      var angleConvert = 2 * Math.PI;
      var radius = this.r * hsv.s;
      var x = this.centerCoordinates.x + radius * Math.sin(angleConvert * hsv.h);
      var y = this.centerCoordinates.y + radius * Math.cos(angleConvert * hsv.h);
      this.colorPickerSelector.style.left = x - 0.5 * this.colorPickerSelector.clientWidth + 'px';
      this.colorPickerSelector.style.top = y - 0.5 * this.colorPickerSelector.clientHeight + 'px';

      this._updatePicker(rgba);
    }
    /**
     * bound to opacity control
     * @param {number} value
     * @private
     */

  }, {
    key: "_setOpacity",
    value: function _setOpacity(value) {
      this.color.a = value / 100;

      this._updatePicker(this.color);
    }
    /**
     * bound to brightness control
     * @param {number} value
     * @private
     */

  }, {
    key: "_setBrightness",
    value: function _setBrightness(value) {
      var hsv = util.RGBToHSV(this.color.r, this.color.g, this.color.b);
      hsv.v = value / 100;
      var rgba = util.HSVToRGB(hsv.h, hsv.s, hsv.v);
      rgba['a'] = this.color.a;
      this.color = rgba;

      this._updatePicker();
    }
    /**
     * update the color picker. A black circle overlays the hue circle to mimic the brightness decreasing.
     * @param {Object} rgba
     * @private
     */

  }, {
    key: "_updatePicker",
    value: function _updatePicker() {
      var rgba = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : this.color;
      var hsv = util.RGBToHSV(rgba.r, rgba.g, rgba.b);
      var ctx = this.colorPickerCanvas.getContext('2d');

      if (this.pixelRation === undefined) {
        this.pixelRatio = (window.devicePixelRatio || 1) / (ctx.webkitBackingStorePixelRatio || ctx.mozBackingStorePixelRatio || ctx.msBackingStorePixelRatio || ctx.oBackingStorePixelRatio || ctx.backingStorePixelRatio || 1);
      }

      ctx.setTransform(this.pixelRatio, 0, 0, this.pixelRatio, 0, 0); // clear the canvas

      var w = this.colorPickerCanvas.clientWidth;
      var h = this.colorPickerCanvas.clientHeight;
      ctx.clearRect(0, 0, w, h);
      ctx.putImageData(this.hueCircle, 0, 0);
      ctx.fillStyle = 'rgba(0,0,0,' + (1 - hsv.v) + ')';
      ctx.circle(this.centerCoordinates.x, this.centerCoordinates.y, this.r);
      ctx.fill();
      this.brightnessRange.value = 100 * hsv.v;
      this.opacityRange.value = 100 * rgba.a;
      this.initialColorDiv.style.backgroundColor = 'rgba(' + this.initialColor.r + ',' + this.initialColor.g + ',' + this.initialColor.b + ',' + this.initialColor.a + ')';
      this.newColorDiv.style.backgroundColor = 'rgba(' + this.color.r + ',' + this.color.g + ',' + this.color.b + ',' + this.color.a + ')';
    }
    /**
     * used by create to set the size of the canvas.
     * @private
     */

  }, {
    key: "_setSize",
    value: function _setSize() {
      this.colorPickerCanvas.style.width = '100%';
      this.colorPickerCanvas.style.height = '100%';
      this.colorPickerCanvas.width = 289 * this.pixelRatio;
      this.colorPickerCanvas.height = 289 * this.pixelRatio;
    }
    /**
     * create all dom elements
     * TODO: cleanup, lots of similar dom elements
     * @private
     */

  }, {
    key: "_create",
    value: function _create() {
      this.frame = document.createElement('div');
      this.frame.className = 'vis-color-picker';
      this.colorPickerDiv = document.createElement('div');
      this.colorPickerSelector = document.createElement('div');
      this.colorPickerSelector.className = 'vis-selector';
      this.colorPickerDiv.appendChild(this.colorPickerSelector);
      this.colorPickerCanvas = document.createElement('canvas');
      this.colorPickerDiv.appendChild(this.colorPickerCanvas);

      if (!this.colorPickerCanvas.getContext) {
        var noCanvas = document.createElement('DIV');
        noCanvas.style.color = 'red';
        noCanvas.style.fontWeight = 'bold';
        noCanvas.style.padding = '10px';
        noCanvas.innerHTML = 'Error: your browser does not support HTML canvas';
        this.colorPickerCanvas.appendChild(noCanvas);
      } else {
        var ctx = this.colorPickerCanvas.getContext("2d");
        this.pixelRatio = (window.devicePixelRatio || 1) / (ctx.webkitBackingStorePixelRatio || ctx.mozBackingStorePixelRatio || ctx.msBackingStorePixelRatio || ctx.oBackingStorePixelRatio || ctx.backingStorePixelRatio || 1);
        this.colorPickerCanvas.getContext("2d").setTransform(this.pixelRatio, 0, 0, this.pixelRatio, 0, 0);
      }

      this.colorPickerDiv.className = 'vis-color';
      this.opacityDiv = document.createElement('div');
      this.opacityDiv.className = 'vis-opacity';
      this.brightnessDiv = document.createElement('div');
      this.brightnessDiv.className = 'vis-brightness';
      this.arrowDiv = document.createElement('div');
      this.arrowDiv.className = 'vis-arrow';
      this.opacityRange = document.createElement('input');

      try {
        this.opacityRange.type = 'range'; // Not supported on IE9

        this.opacityRange.min = '0';
        this.opacityRange.max = '100';
      } // TODO: Add some error handling and remove this lint exception
      catch (err) {} // eslint-disable-line no-empty


      this.opacityRange.value = '100';
      this.opacityRange.className = 'vis-range';
      this.brightnessRange = document.createElement('input');

      try {
        this.brightnessRange.type = 'range'; // Not supported on IE9

        this.brightnessRange.min = '0';
        this.brightnessRange.max = '100';
      } // TODO: Add some error handling and remove this lint exception
      catch (err) {} // eslint-disable-line no-empty


      this.brightnessRange.value = '100';
      this.brightnessRange.className = 'vis-range';
      this.opacityDiv.appendChild(this.opacityRange);
      this.brightnessDiv.appendChild(this.brightnessRange);
      var me = this;

      this.opacityRange.onchange = function () {
        me._setOpacity(this.value);
      };

      this.opacityRange.oninput = function () {
        me._setOpacity(this.value);
      };

      this.brightnessRange.onchange = function () {
        me._setBrightness(this.value);
      };

      this.brightnessRange.oninput = function () {
        me._setBrightness(this.value);
      };

      this.brightnessLabel = document.createElement("div");
      this.brightnessLabel.className = "vis-label vis-brightness";
      this.brightnessLabel.innerHTML = 'brightness:';
      this.opacityLabel = document.createElement("div");
      this.opacityLabel.className = "vis-label vis-opacity";
      this.opacityLabel.innerHTML = 'opacity:';
      this.newColorDiv = document.createElement("div");
      this.newColorDiv.className = "vis-new-color";
      this.newColorDiv.innerHTML = 'new';
      this.initialColorDiv = document.createElement("div");
      this.initialColorDiv.className = "vis-initial-color";
      this.initialColorDiv.innerHTML = 'initial';
      this.cancelButton = document.createElement("div");
      this.cancelButton.className = "vis-button vis-cancel";
      this.cancelButton.innerHTML = 'cancel';
      this.cancelButton.onclick = this._hide.bind(this, false);
      this.applyButton = document.createElement("div");
      this.applyButton.className = "vis-button vis-apply";
      this.applyButton.innerHTML = 'apply';
      this.applyButton.onclick = this._apply.bind(this);
      this.saveButton = document.createElement("div");
      this.saveButton.className = "vis-button vis-save";
      this.saveButton.innerHTML = 'save';
      this.saveButton.onclick = this._save.bind(this);
      this.loadButton = document.createElement("div");
      this.loadButton.className = "vis-button vis-load";
      this.loadButton.innerHTML = 'load last';
      this.loadButton.onclick = this._loadLast.bind(this);
      this.frame.appendChild(this.colorPickerDiv);
      this.frame.appendChild(this.arrowDiv);
      this.frame.appendChild(this.brightnessLabel);
      this.frame.appendChild(this.brightnessDiv);
      this.frame.appendChild(this.opacityLabel);
      this.frame.appendChild(this.opacityDiv);
      this.frame.appendChild(this.newColorDiv);
      this.frame.appendChild(this.initialColorDiv);
      this.frame.appendChild(this.cancelButton);
      this.frame.appendChild(this.applyButton);
      this.frame.appendChild(this.saveButton);
      this.frame.appendChild(this.loadButton);
    }
    /**
     * bind hammer to the color picker
     * @private
     */

  }, {
    key: "_bindHammer",
    value: function _bindHammer() {
      var _this2 = this;

      this.drag = {};
      this.pinch = {};
      this.hammer = new hammer$1(this.colorPickerCanvas);
      this.hammer.get('pinch').set({
        enable: true
      });
      hammerUtil.onTouch(this.hammer, function (event) {
        _this2._moveSelector(event);
      });
      this.hammer.on('tap', function (event) {
        _this2._moveSelector(event);
      });
      this.hammer.on('panstart', function (event) {
        _this2._moveSelector(event);
      });
      this.hammer.on('panmove', function (event) {
        _this2._moveSelector(event);
      });
      this.hammer.on('panend', function (event) {
        _this2._moveSelector(event);
      });
    }
    /**
     * generate the hue circle. This is relatively heavy (200ms) and is done only once on the first time it is shown.
     * @private
     */

  }, {
    key: "_generateHueCircle",
    value: function _generateHueCircle() {
      if (this.generated === false) {
        var ctx = this.colorPickerCanvas.getContext('2d');

        if (this.pixelRation === undefined) {
          this.pixelRatio = (window.devicePixelRatio || 1) / (ctx.webkitBackingStorePixelRatio || ctx.mozBackingStorePixelRatio || ctx.msBackingStorePixelRatio || ctx.oBackingStorePixelRatio || ctx.backingStorePixelRatio || 1);
        }

        ctx.setTransform(this.pixelRatio, 0, 0, this.pixelRatio, 0, 0); // clear the canvas

        var w = this.colorPickerCanvas.clientWidth;
        var h = this.colorPickerCanvas.clientHeight;
        ctx.clearRect(0, 0, w, h); // draw hue circle

        var x, y, hue, sat;
        this.centerCoordinates = {
          x: w * 0.5,
          y: h * 0.5
        };
        this.r = 0.49 * w;
        var angleConvert = 2 * Math.PI / 360;
        var hfac = 1 / 360;
        var sfac = 1 / this.r;
        var rgb;

        for (hue = 0; hue < 360; hue++) {
          for (sat = 0; sat < this.r; sat++) {
            x = this.centerCoordinates.x + sat * Math.sin(angleConvert * hue);
            y = this.centerCoordinates.y + sat * Math.cos(angleConvert * hue);
            rgb = util.HSVToRGB(hue * hfac, sat * sfac, 1);
            ctx.fillStyle = 'rgb(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ')';
            ctx.fillRect(x - 0.5, y - 0.5, 2, 2);
          }
        }

        ctx.strokeStyle = 'rgba(0,0,0,1)';
        ctx.circle(this.centerCoordinates.x, this.centerCoordinates.y, this.r);
        ctx.stroke();
        this.hueCircle = ctx.getImageData(0, 0, w, h);
      }

      this.generated = true;
    }
    /**
     * move the selector. This is called by hammer functions.
     *
     * @param {Event}  event   The event
     * @private
     */

  }, {
    key: "_moveSelector",
    value: function _moveSelector(event) {
      var rect = this.colorPickerDiv.getBoundingClientRect();
      var left = event.center.x - rect.left;
      var top = event.center.y - rect.top;
      var centerY = 0.5 * this.colorPickerDiv.clientHeight;
      var centerX = 0.5 * this.colorPickerDiv.clientWidth;
      var x = left - centerX;
      var y = top - centerY;
      var angle = Math.atan2(x, y);
      var radius = 0.98 * Math.min(Math.sqrt(x * x + y * y), centerX);
      var newTop = Math.cos(angle) * radius + centerY;
      var newLeft = Math.sin(angle) * radius + centerX;
      this.colorPickerSelector.style.top = newTop - 0.5 * this.colorPickerSelector.clientHeight + 'px';
      this.colorPickerSelector.style.left = newLeft - 0.5 * this.colorPickerSelector.clientWidth + 'px'; // set color

      var h = angle / (2 * Math.PI);
      h = h < 0 ? h + 1 : h;
      var s = radius / this.r;
      var hsv = util.RGBToHSV(this.color.r, this.color.g, this.color.b);
      hsv.h = h;
      hsv.s = s;
      var rgba = util.HSVToRGB(hsv.h, hsv.s, hsv.v);
      rgba['a'] = this.color.a;
      this.color = rgba; // update previews

      this.initialColorDiv.style.backgroundColor = 'rgba(' + this.initialColor.r + ',' + this.initialColor.g + ',' + this.initialColor.b + ',' + this.initialColor.a + ')';
      this.newColorDiv.style.backgroundColor = 'rgba(' + this.color.r + ',' + this.color.g + ',' + this.color.b + ',' + this.color.a + ')';
    }
  }]);

  return ColorPicker;
}();

/**
 * The way this works is for all properties of this.possible options, you can supply the property name in any form to list the options.
 * Boolean options are recognised as Boolean
 * Number options should be written as array: [default value, min value, max value, stepsize]
 * Colors should be written as array: ['color', '#ffffff']
 * Strings with should be written as array: [option1, option2, option3, ..]
 *
 * The options are matched with their counterparts in each of the modules and the values used in the configuration are
 */

var Configurator =
/*#__PURE__*/
function () {
  /**
   * @param {Object} parentModule        | the location where parentModule.setOptions() can be called
   * @param {Object} defaultContainer    | the default container of the module
   * @param {Object} configureOptions    | the fully configured and predefined options set found in allOptions.js
   * @param {number} pixelRatio          | canvas pixel ratio
   */
  function Configurator(parentModule, defaultContainer, configureOptions) {
    var pixelRatio = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : 1;

    _classCallCheck$1(this, Configurator);

    this.parent = parentModule;
    this.changedOptions = [];
    this.container = defaultContainer;
    this.allowCreation = false;
    this.options = {};
    this.initialized = false;
    this.popupCounter = 0;
    this.defaultOptions = {
      enabled: false,
      filter: true,
      container: undefined,
      showButton: true
    };
    util.extend(this.options, this.defaultOptions);
    this.configureOptions = configureOptions;
    this.moduleOptions = {};
    this.domElements = [];
    this.popupDiv = {};
    this.popupLimit = 5;
    this.popupHistory = {};
    this.colorPicker = new ColorPicker(pixelRatio);
    this.wrapper = undefined;
  }
  /**
   * refresh all options.
   * Because all modules parse their options by themselves, we just use their options. We copy them here.
   *
   * @param {Object} options
   */


  _createClass$1(Configurator, [{
    key: "setOptions",
    value: function setOptions(options) {
      if (options !== undefined) {
        // reset the popup history because the indices may have been changed.
        this.popupHistory = {};

        this._removePopup();

        var enabled = true;

        if (typeof options === 'string') {
          this.options.filter = options;
        } else if (options instanceof Array) {
          this.options.filter = options.join();
        } else if (_typeof$1(options) === 'object') {
          if (options == null) {
            throw new TypeError('options cannot be null');
          }

          if (options.container !== undefined) {
            this.options.container = options.container;
          }

          if (options.filter !== undefined) {
            this.options.filter = options.filter;
          }

          if (options.showButton !== undefined) {
            this.options.showButton = options.showButton;
          }

          if (options.enabled !== undefined) {
            enabled = options.enabled;
          }
        } else if (typeof options === 'boolean') {
          this.options.filter = true;
          enabled = options;
        } else if (typeof options === 'function') {
          this.options.filter = options;
          enabled = true;
        }

        if (this.options.filter === false) {
          enabled = false;
        }

        this.options.enabled = enabled;
      }

      this._clean();
    }
    /**
     *
     * @param {Object} moduleOptions
     */

  }, {
    key: "setModuleOptions",
    value: function setModuleOptions(moduleOptions) {
      this.moduleOptions = moduleOptions;

      if (this.options.enabled === true) {
        this._clean();

        if (this.options.container !== undefined) {
          this.container = this.options.container;
        }

        this._create();
      }
    }
    /**
     * Create all DOM elements
     * @private
     */

  }, {
    key: "_create",
    value: function _create() {
      this._clean();

      this.changedOptions = [];
      var filter = this.options.filter;
      var counter = 0;
      var show = false;

      for (var option in this.configureOptions) {
        if (this.configureOptions.hasOwnProperty(option)) {
          this.allowCreation = false;
          show = false;

          if (typeof filter === 'function') {
            show = filter(option, []);
            show = show || this._handleObject(this.configureOptions[option], [option], true);
          } else if (filter === true || filter.indexOf(option) !== -1) {
            show = true;
          }

          if (show !== false) {
            this.allowCreation = true; // linebreak between categories

            if (counter > 0) {
              this._makeItem([]);
            } // a header for the category


            this._makeHeader(option); // get the sub options


            this._handleObject(this.configureOptions[option], [option]);
          }

          counter++;
        }
      }

      this._makeButton();

      this._push(); //~ this.colorPicker.insertTo(this.container);

    }
    /**
     * draw all DOM elements on the screen
     * @private
     */

  }, {
    key: "_push",
    value: function _push() {
      this.wrapper = document.createElement('div');
      this.wrapper.className = 'vis-configuration-wrapper';
      this.container.appendChild(this.wrapper);

      for (var i = 0; i < this.domElements.length; i++) {
        this.wrapper.appendChild(this.domElements[i]);
      }

      this._showPopupIfNeeded();
    }
    /**
     * delete all DOM elements
     * @private
     */

  }, {
    key: "_clean",
    value: function _clean() {
      for (var i = 0; i < this.domElements.length; i++) {
        this.wrapper.removeChild(this.domElements[i]);
      }

      if (this.wrapper !== undefined) {
        this.container.removeChild(this.wrapper);
        this.wrapper = undefined;
      }

      this.domElements = [];

      this._removePopup();
    }
    /**
     * get the value from the actualOptions if it exists
     * @param {array} path    | where to look for the actual option
     * @returns {*}
     * @private
     */

  }, {
    key: "_getValue",
    value: function _getValue(path) {
      var base = this.moduleOptions;

      for (var i = 0; i < path.length; i++) {
        if (base[path[i]] !== undefined) {
          base = base[path[i]];
        } else {
          base = undefined;
          break;
        }
      }

      return base;
    }
    /**
     * all option elements are wrapped in an item
     * @param {Array} path    | where to look for the actual option
     * @param {Array.<Element>} domElements
     * @returns {number}
     * @private
     */

  }, {
    key: "_makeItem",
    value: function _makeItem(path) {
      if (this.allowCreation === true) {
        var item = document.createElement('div');
        item.className = 'vis-configuration vis-config-item vis-config-s' + path.length;

        for (var _len = arguments.length, domElements = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
          domElements[_key - 1] = arguments[_key];
        }

        domElements.forEach(function (element) {
          item.appendChild(element);
        });
        this.domElements.push(item);
        return this.domElements.length;
      }

      return 0;
    }
    /**
     * header for major subjects
     * @param {string} name
     * @private
     */

  }, {
    key: "_makeHeader",
    value: function _makeHeader(name) {
      var div = document.createElement('div');
      div.className = 'vis-configuration vis-config-header';
      div.innerHTML = name;

      this._makeItem([], div);
    }
    /**
     * make a label, if it is an object label, it gets different styling.
     * @param {string} name
     * @param {array} path    | where to look for the actual option
     * @param {string} objectLabel
     * @returns {HTMLElement}
     * @private
     */

  }, {
    key: "_makeLabel",
    value: function _makeLabel(name, path) {
      var objectLabel = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
      var div = document.createElement('div');
      div.className = 'vis-configuration vis-config-label vis-config-s' + path.length;

      if (objectLabel === true) {
        div.innerHTML = '<i><b>' + name + ':</b></i>';
      } else {
        div.innerHTML = name + ':';
      }

      return div;
    }
    /**
     * make a dropdown list for multiple possible string optoins
     * @param {Array.<number>} arr
     * @param {number} value
     * @param {array} path    | where to look for the actual option
     * @private
     */

  }, {
    key: "_makeDropdown",
    value: function _makeDropdown(arr, value, path) {
      var select = document.createElement('select');
      select.className = 'vis-configuration vis-config-select';
      var selectedValue = 0;

      if (value !== undefined) {
        if (arr.indexOf(value) !== -1) {
          selectedValue = arr.indexOf(value);
        }
      }

      for (var i = 0; i < arr.length; i++) {
        var option = document.createElement('option');
        option.value = arr[i];

        if (i === selectedValue) {
          option.selected = 'selected';
        }

        option.innerHTML = arr[i];
        select.appendChild(option);
      }

      var me = this;

      select.onchange = function () {
        me._update(this.value, path);
      };

      var label = this._makeLabel(path[path.length - 1], path);

      this._makeItem(path, label, select);
    }
    /**
     * make a range object for numeric options
     * @param {Array.<number>} arr
     * @param {number} value
     * @param {array} path    | where to look for the actual option
     * @private
     */

  }, {
    key: "_makeRange",
    value: function _makeRange(arr, value, path) {
      var defaultValue = arr[0];
      var min = arr[1];
      var max = arr[2];
      var step = arr[3];
      var range = document.createElement('input');
      range.className = 'vis-configuration vis-config-range';

      try {
        range.type = 'range'; // not supported on IE9

        range.min = min;
        range.max = max;
      } // TODO: Add some error handling and remove this lint exception
      catch (err) {} // eslint-disable-line no-empty


      range.step = step; // set up the popup settings in case they are needed.

      var popupString = '';
      var popupValue = 0;

      if (value !== undefined) {
        var factor = 1.20;

        if (value < 0 && value * factor < min) {
          range.min = Math.ceil(value * factor);
          popupValue = range.min;
          popupString = 'range increased';
        } else if (value / factor < min) {
          range.min = Math.ceil(value / factor);
          popupValue = range.min;
          popupString = 'range increased';
        }

        if (value * factor > max && max !== 1) {
          range.max = Math.ceil(value * factor);
          popupValue = range.max;
          popupString = 'range increased';
        }

        range.value = value;
      } else {
        range.value = defaultValue;
      }

      var input = document.createElement('input');
      input.className = 'vis-configuration vis-config-rangeinput';
      input.value = range.value;
      var me = this;

      range.onchange = function () {
        input.value = this.value;

        me._update(Number(this.value), path);
      };

      range.oninput = function () {
        input.value = this.value;
      };

      var label = this._makeLabel(path[path.length - 1], path);

      var itemIndex = this._makeItem(path, label, range, input); // if a popup is needed AND it has not been shown for this value, show it.


      if (popupString !== '' && this.popupHistory[itemIndex] !== popupValue) {
        this.popupHistory[itemIndex] = popupValue;

        this._setupPopup(popupString, itemIndex);
      }
    }
    /**
     * make a button object
     * @private
     */

  }, {
    key: "_makeButton",
    value: function _makeButton() {
      var _this = this;

      if (this.options.showButton === true) {
        var generateButton = document.createElement('div');
        generateButton.className = 'vis-configuration vis-config-button';
        generateButton.innerHTML = 'generate options';

        generateButton.onclick = function () {
          _this._printOptions();
        };

        generateButton.onmouseover = function () {
          generateButton.className = 'vis-configuration vis-config-button hover';
        };

        generateButton.onmouseout = function () {
          generateButton.className = 'vis-configuration vis-config-button';
        };

        this.optionsContainer = document.createElement('div');
        this.optionsContainer.className = 'vis-configuration vis-config-option-container';
        this.domElements.push(this.optionsContainer);
        this.domElements.push(generateButton);
      }
    }
    /**
     * prepare the popup
     * @param {string} string
     * @param {number} index
     * @private
     */

  }, {
    key: "_setupPopup",
    value: function _setupPopup(string, index) {
      var _this2 = this;

      if (this.initialized === true && this.allowCreation === true && this.popupCounter < this.popupLimit) {
        var div = document.createElement("div");
        div.id = "vis-configuration-popup";
        div.className = "vis-configuration-popup";
        div.innerHTML = string;

        div.onclick = function () {
          _this2._removePopup();
        };

        this.popupCounter += 1;
        this.popupDiv = {
          html: div,
          index: index
        };
      }
    }
    /**
     * remove the popup from the dom
     * @private
     */

  }, {
    key: "_removePopup",
    value: function _removePopup() {
      if (this.popupDiv.html !== undefined) {
        this.popupDiv.html.parentNode.removeChild(this.popupDiv.html);
        clearTimeout(this.popupDiv.hideTimeout);
        clearTimeout(this.popupDiv.deleteTimeout);
        this.popupDiv = {};
      }
    }
    /**
     * Show the popup if it is needed.
     * @private
     */

  }, {
    key: "_showPopupIfNeeded",
    value: function _showPopupIfNeeded() {
      var _this3 = this;

      if (this.popupDiv.html !== undefined) {
        var correspondingElement = this.domElements[this.popupDiv.index];
        var rect = correspondingElement.getBoundingClientRect();
        this.popupDiv.html.style.left = rect.left + "px";
        this.popupDiv.html.style.top = rect.top - 30 + "px"; // 30 is the height;

        document.body.appendChild(this.popupDiv.html);
        this.popupDiv.hideTimeout = setTimeout(function () {
          _this3.popupDiv.html.style.opacity = 0;
        }, 1500);
        this.popupDiv.deleteTimeout = setTimeout(function () {
          _this3._removePopup();
        }, 1800);
      }
    }
    /**
     * make a checkbox for boolean options.
     * @param {number} defaultValue
     * @param {number} value
     * @param {array} path    | where to look for the actual option
     * @private
     */

  }, {
    key: "_makeCheckbox",
    value: function _makeCheckbox(defaultValue, value, path) {
      var checkbox = document.createElement('input');
      checkbox.type = 'checkbox';
      checkbox.className = 'vis-configuration vis-config-checkbox';
      checkbox.checked = defaultValue;

      if (value !== undefined) {
        checkbox.checked = value;

        if (value !== defaultValue) {
          if (_typeof$1(defaultValue) === 'object') {
            if (value !== defaultValue.enabled) {
              this.changedOptions.push({
                path: path,
                value: value
              });
            }
          } else {
            this.changedOptions.push({
              path: path,
              value: value
            });
          }
        }
      }

      var me = this;

      checkbox.onchange = function () {
        me._update(this.checked, path);
      };

      var label = this._makeLabel(path[path.length - 1], path);

      this._makeItem(path, label, checkbox);
    }
    /**
     * make a text input field for string options.
     * @param {number} defaultValue
     * @param {number} value
     * @param {array} path    | where to look for the actual option
     * @private
     */

  }, {
    key: "_makeTextInput",
    value: function _makeTextInput(defaultValue, value, path) {
      var checkbox = document.createElement('input');
      checkbox.type = 'text';
      checkbox.className = 'vis-configuration vis-config-text';
      checkbox.value = value;

      if (value !== defaultValue) {
        this.changedOptions.push({
          path: path,
          value: value
        });
      }

      var me = this;

      checkbox.onchange = function () {
        me._update(this.value, path);
      };

      var label = this._makeLabel(path[path.length - 1], path);

      this._makeItem(path, label, checkbox);
    }
    /**
     * make a color field with a color picker for color fields
     * @param {Array.<number>} arr
     * @param {number} value
     * @param {array} path    | where to look for the actual option
     * @private
     */

  }, {
    key: "_makeColorField",
    value: function _makeColorField(arr, value, path) {
      var _this4 = this;

      var defaultColor = arr[1];
      var div = document.createElement('div');
      value = value === undefined ? defaultColor : value;

      if (value !== 'none') {
        div.className = 'vis-configuration vis-config-colorBlock';
        div.style.backgroundColor = value;
      } else {
        div.className = 'vis-configuration vis-config-colorBlock none';
      }

      value = value === undefined ? defaultColor : value;

      div.onclick = function () {
        _this4._showColorPicker(value, div, path);
      };

      var label = this._makeLabel(path[path.length - 1], path);

      this._makeItem(path, label, div);
    }
    /**
     * used by the color buttons to call the color picker.
     * @param {number} value
     * @param {HTMLElement} div
     * @param {array} path    | where to look for the actual option
     * @private
     */

  }, {
    key: "_showColorPicker",
    value: function _showColorPicker(value, div, path) {
      var _this5 = this;

      // clear the callback from this div
      div.onclick = function () {};

      this.colorPicker.insertTo(div);
      this.colorPicker.show();
      this.colorPicker.setColor(value);
      this.colorPicker.setUpdateCallback(function (color) {
        var colorString = 'rgba(' + color.r + ',' + color.g + ',' + color.b + ',' + color.a + ')';
        div.style.backgroundColor = colorString;

        _this5._update(colorString, path);
      }); // on close of the colorpicker, restore the callback.

      this.colorPicker.setCloseCallback(function () {
        div.onclick = function () {
          _this5._showColorPicker(value, div, path);
        };
      });
    }
    /**
     * parse an object and draw the correct items
     * @param {Object} obj
     * @param {array} [path=[]]    | where to look for the actual option
     * @param {boolean} [checkOnly=false]
     * @returns {boolean}
     * @private
     */

  }, {
    key: "_handleObject",
    value: function _handleObject(obj) {
      var path = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];
      var checkOnly = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
      var show = false;
      var filter = this.options.filter;
      var visibleInSet = false;

      for (var subObj in obj) {
        if (obj.hasOwnProperty(subObj)) {
          show = true;
          var item = obj[subObj];
          var newPath = util.copyAndExtendArray(path, subObj);

          if (typeof filter === 'function') {
            show = filter(subObj, path); // if needed we must go deeper into the object.

            if (show === false) {
              if (!(item instanceof Array) && typeof item !== 'string' && typeof item !== 'boolean' && item instanceof Object) {
                this.allowCreation = false;
                show = this._handleObject(item, newPath, true);
                this.allowCreation = checkOnly === false;
              }
            }
          }

          if (show !== false) {
            visibleInSet = true;

            var value = this._getValue(newPath);

            if (item instanceof Array) {
              this._handleArray(item, value, newPath);
            } else if (typeof item === 'string') {
              this._makeTextInput(item, value, newPath);
            } else if (typeof item === 'boolean') {
              this._makeCheckbox(item, value, newPath);
            } else if (item instanceof Object) {
              // collapse the physics options that are not enabled
              var draw = true;

              if (path.indexOf('physics') !== -1) {
                if (this.moduleOptions.physics.solver !== subObj) {
                  draw = false;
                }
              }

              if (draw === true) {
                // initially collapse options with an disabled enabled option.
                if (item.enabled !== undefined) {
                  var enabledPath = util.copyAndExtendArray(newPath, 'enabled');

                  var enabledValue = this._getValue(enabledPath);

                  if (enabledValue === true) {
                    var label = this._makeLabel(subObj, newPath, true);

                    this._makeItem(newPath, label);

                    visibleInSet = this._handleObject(item, newPath) || visibleInSet;
                  } else {
                    this._makeCheckbox(item, enabledValue, newPath);
                  }
                } else {
                  var _label = this._makeLabel(subObj, newPath, true);

                  this._makeItem(newPath, _label);

                  visibleInSet = this._handleObject(item, newPath) || visibleInSet;
                }
              }
            } else {
              console.error('dont know how to handle', item, subObj, newPath);
            }
          }
        }
      }

      return visibleInSet;
    }
    /**
     * handle the array type of option
     * @param {Array.<number>} arr
     * @param {number} value
     * @param {array} path    | where to look for the actual option
     * @private
     */

  }, {
    key: "_handleArray",
    value: function _handleArray(arr, value, path) {
      if (typeof arr[0] === 'string' && arr[0] === 'color') {
        this._makeColorField(arr, value, path);

        if (arr[1] !== value) {
          this.changedOptions.push({
            path: path,
            value: value
          });
        }
      } else if (typeof arr[0] === 'string') {
        this._makeDropdown(arr, value, path);

        if (arr[0] !== value) {
          this.changedOptions.push({
            path: path,
            value: value
          });
        }
      } else if (typeof arr[0] === 'number') {
        this._makeRange(arr, value, path);

        if (arr[0] !== value) {
          this.changedOptions.push({
            path: path,
            value: Number(value)
          });
        }
      }
    }
    /**
     * called to update the network with the new settings.
     * @param {number} value
     * @param {array} path    | where to look for the actual option
     * @private
     */

  }, {
    key: "_update",
    value: function _update(value, path) {
      var options = this._constructOptions(value, path);

      if (this.parent.body && this.parent.body.emitter && this.parent.body.emitter.emit) {
        this.parent.body.emitter.emit("configChange", options);
      }

      this.initialized = true;
      this.parent.setOptions(options);
    }
    /**
     *
     * @param {string|Boolean} value
     * @param {Array.<string>} path
     * @param {{}} optionsObj
     * @returns {{}}
     * @private
     */

  }, {
    key: "_constructOptions",
    value: function _constructOptions(value, path) {
      var optionsObj = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
      var pointer = optionsObj; // when dropdown boxes can be string or boolean, we typecast it into correct types

      value = value === 'true' ? true : value;
      value = value === 'false' ? false : value;

      for (var i = 0; i < path.length; i++) {
        if (path[i] !== 'global') {
          if (pointer[path[i]] === undefined) {
            pointer[path[i]] = {};
          }

          if (i !== path.length - 1) {
            pointer = pointer[path[i]];
          } else {
            pointer[path[i]] = value;
          }
        }
      }

      return optionsObj;
    }
    /**
     * @private
     */

  }, {
    key: "_printOptions",
    value: function _printOptions() {
      var options = this.getOptions();
      this.optionsContainer.innerHTML = '<pre>var options = ' + JSON.stringify(options, null, 2) + '</pre>';
    }
    /**
     *
     * @returns {{}} options
     */

  }, {
    key: "getOptions",
    value: function getOptions() {
      var options = {};

      for (var i = 0; i < this.changedOptions.length; i++) {
        this._constructOptions(this.changedOptions[i].value, this.changedOptions[i].path, options);
      }

      return options;
    }
  }]);

  return Configurator;
}();

var DataSet$1 = index.DataSet;
var DataView$1 = index.DataView;
var Validator$2 = Validator$1.Validator;
var printStyle$1 = Validator$1.printStyle;
var allOptions$2 = optionsTimeline.allOptions;
var configureOptions$1 = optionsTimeline.configureOptions;
var Configurator$1 = Configurator.default;
/**
 * Create a timeline visualization
 * @param {HTMLElement} container
 * @param {vis.DataSet | vis.DataView | Array} [items]
 * @param {vis.DataSet | vis.DataView | Array} [groups]
 * @param {Object} [options]  See Timeline.setOptions for the available options.
 * @constructor Timeline
 * @extends Core
 */

function Timeline(container, items, groups, options) {
  this.initTime = new Date();
  this.itemsDone = false;

  if (!(this instanceof Timeline)) {
    throw new SyntaxError('Constructor must be called with the new operator');
  } // if the third element is options, the forth is groups (optionally);


  if (!(Array.isArray(groups) || groups instanceof DataSet$1 || groups instanceof DataView$1) && groups instanceof Object) {
    var forthArgument = options;
    options = groups;
    groups = forthArgument;
  } // TODO: REMOVE THIS in the next MAJOR release
  // see https://github.com/almende/vis/issues/2511


  if (options && options.throttleRedraw) {
    console.warn("Timeline option \"throttleRedraw\" is DEPRICATED and no longer supported. It will be removed in the next MAJOR release.");
  }

  var me = this;
  this.defaultOptions = {
    start: null,
    end: null,
    autoResize: true,
    orientation: {
      axis: 'bottom',
      // axis orientation: 'bottom', 'top', or 'both'
      item: 'bottom' // not relevant

    },
    moment: moment$3,
    width: null,
    height: null,
    maxHeight: null,
    minHeight: null
  };
  this.options = util.deepExtend({}, this.defaultOptions); // Create the DOM, props, and emitter

  this._create(container);

  if (!options || options && typeof options.rtl == "undefined") {
    this.dom.root.style.visibility = 'hidden';
    var directionFromDom,
        domNode = this.dom.root;

    while (!directionFromDom && domNode) {
      directionFromDom = window.getComputedStyle(domNode, null).direction;
      domNode = domNode.parentElement;
    }

    this.options.rtl = directionFromDom && directionFromDom.toLowerCase() == "rtl";
  } else {
    this.options.rtl = options.rtl;
  }

  this.options.rollingMode = options && options.rollingMode;
  this.options.onInitialDrawComplete = options && options.onInitialDrawComplete;
  this.options.onTimeout = options && options.onTimeout;
  this.options.loadingScreenTemplate = options && options.loadingScreenTemplate; // Prepare loading screen

  var loadingScreenFragment = document.createElement('div');

  if (this.options.loadingScreenTemplate) {
    var templateFunction = this.options.loadingScreenTemplate.bind(this);
    var loadingScreen = templateFunction(this.dom.loadingScreen);

    if (loadingScreen instanceof Object && !(loadingScreen instanceof Element)) {
      templateFunction(loadingScreenFragment);
    } else {
      if (loadingScreen instanceof Element) {
        loadingScreenFragment.innerHTML = '';
        loadingScreenFragment.appendChild(loadingScreen);
      } else if (loadingScreen != undefined) {
        loadingScreenFragment.innerHTML = loadingScreen;
      }
    }
  }

  this.dom.loadingScreen.appendChild(loadingScreenFragment); // all components listed here will be repainted automatically

  this.components = [];
  this.body = {
    dom: this.dom,
    domProps: this.props,
    emitter: {
      on: this.on.bind(this),
      off: this.off.bind(this),
      emit: this.emit.bind(this)
    },
    hiddenDates: [],
    util: {
      getScale: function getScale() {
        return me.timeAxis.step.scale;
      },
      getStep: function getStep() {
        return me.timeAxis.step.step;
      },
      toScreen: me._toScreen.bind(me),
      toGlobalScreen: me._toGlobalScreen.bind(me),
      // this refers to the root.width
      toTime: me._toTime.bind(me),
      toGlobalTime: me._toGlobalTime.bind(me)
    }
  }; // range

  this.range = new Range_1(this.body, this.options);
  this.components.push(this.range);
  this.body.range = this.range; // time axis

  this.timeAxis = new TimeAxis(this.body, this.options);
  this.timeAxis2 = null; // used in case of orientation option 'both'

  this.components.push(this.timeAxis); // current time bar

  this.currentTime = new CurrentTime_1(this.body, this.options);
  this.components.push(this.currentTime); // item set

  this.itemSet = new ItemSet(this.body, this.options);
  this.components.push(this.itemSet);
  this.itemsData = null; // DataSet

  this.groupsData = null; // DataSet

  this.dom.root.onclick = function (event) {
    me.emit('click', me.getEventProperties(event));
  };

  this.dom.root.ondblclick = function (event) {
    me.emit('doubleClick', me.getEventProperties(event));
  };

  this.dom.root.oncontextmenu = function (event) {
    me.emit('contextmenu', me.getEventProperties(event));
  };

  this.dom.root.onmouseover = function (event) {
    me.emit('mouseOver', me.getEventProperties(event));
  };

  if (window.PointerEvent) {
    this.dom.root.onpointerdown = function (event) {
      me.emit('mouseDown', me.getEventProperties(event));
    };

    this.dom.root.onpointermove = function (event) {
      me.emit('mouseMove', me.getEventProperties(event));
    };

    this.dom.root.onpointerup = function (event) {
      me.emit('mouseUp', me.getEventProperties(event));
    };
  } else {
    this.dom.root.onmousemove = function (event) {
      me.emit('mouseMove', me.getEventProperties(event));
    };

    this.dom.root.onmousedown = function (event) {
      me.emit('mouseDown', me.getEventProperties(event));
    };

    this.dom.root.onmouseup = function (event) {
      me.emit('mouseUp', me.getEventProperties(event));
    };
  } //Single time autoscale/fit


  this.initialFitDone = false;
  this.on('changed', function () {
    if (me.itemsData == null) return;

    if (!me.initialFitDone && !me.options.rollingMode) {
      me.initialFitDone = true;

      if (me.options.start != undefined || me.options.end != undefined) {
        if (me.options.start == undefined || me.options.end == undefined) {
          var range = me.getItemRange();
        }

        var start = me.options.start != undefined ? me.options.start : range.min;
        var end = me.options.end != undefined ? me.options.end : range.max;
        me.setWindow(start, end, {
          animation: false
        });
      } else {
        me.fit({
          animation: false
        });
      }
    }

    if (!me.initialDrawDone && (me.initialRangeChangeDone || !me.options.start && !me.options.end || me.options.rollingMode)) {
      me.initialDrawDone = true;
      me.itemSet.initialDrawDone = true;
      me.dom.root.style.visibility = 'visible';
      me.dom.loadingScreen.parentNode.removeChild(me.dom.loadingScreen);

      if (me.options.onInitialDrawComplete) {
        setTimeout(function () {
          return me.options.onInitialDrawComplete();
        }, 0);
      }
    }
  });
  this.on('destroyTimeline', function () {
    me.destroy();
  }); // apply options

  if (options) {
    this.setOptions(options);
  } // IMPORTANT: THIS HAPPENS BEFORE SET ITEMS!


  if (groups) {
    this.setGroups(groups);
  } // create itemset


  if (items) {
    this.setItems(items);
  } // draw for the first time


  this._redraw();
} // Extend the functionality from Core


Timeline.prototype = new Core();
/**
 * Load a configurator
 * @return {Object}
 * @private
 */

Timeline.prototype._createConfigurator = function () {
  return new Configurator$1(this, this.dom.container, configureOptions$1);
};
/**
 * Force a redraw. The size of all items will be recalculated.
 * Can be useful to manually redraw when option autoResize=false and the window
 * has been resized, or when the items CSS has been changed.
 *
 * Note: this function will be overridden on construction with a trottled version
 */


Timeline.prototype.redraw = function () {
  this.itemSet && this.itemSet.markDirty({
    refreshItems: true
  });

  this._redraw();
};

Timeline.prototype.setOptions = function (options) {
  // validate options
  var errorFound = Validator$2.validate(options, allOptions$2);

  if (errorFound === true) {
    console.log('%cErrors have been found in the supplied options object.', printStyle$1);
  }

  Core.prototype.setOptions.call(this, options);

  if ('type' in options) {
    if (options.type !== this.options.type) {
      this.options.type = options.type; // force recreation of all items

      var itemsData = this.itemsData;

      if (itemsData) {
        var selection = this.getSelection();
        this.setItems(null); // remove all

        this.setItems(itemsData); // add all

        this.setSelection(selection); // restore selection
      }
    }
  }
};
/**
 * Set items
 * @param {vis.DataSet | Array | null} items
 */


Timeline.prototype.setItems = function (items) {
  this.itemsDone = false; // convert to type DataSet when needed

  var newDataSet;

  if (!items) {
    newDataSet = null;
  } else if (items instanceof DataSet$1 || items instanceof DataView$1) {
    newDataSet = items;
  } else {
    // turn an array into a dataset
    newDataSet = new DataSet$1(items, {
      type: {
        start: 'Date',
        end: 'Date'
      }
    });
  } // set items


  this.itemsData = newDataSet;
  this.itemSet && this.itemSet.setItems(newDataSet);
};
/**
 * Set groups
 * @param {vis.DataSet | Array} groups
 */


Timeline.prototype.setGroups = function (groups) {
  // convert to type DataSet when needed
  var newDataSet;

  if (!groups) {
    newDataSet = null;
  } else {
    var filter = function filter(group) {
      return group.visible !== false;
    };

    if (groups instanceof DataSet$1 || groups instanceof DataView$1) {
      newDataSet = new DataView$1(groups, {
        filter: filter
      });
    } else {
      // turn an array into a dataset
      newDataSet = new DataSet$1(groups.filter(filter));
    }
  }

  this.groupsData = newDataSet;
  this.itemSet.setGroups(newDataSet);
};
/**
 * Set both items and groups in one go
 * @param {{items: (Array | vis.DataSet), groups: (Array | vis.DataSet)}} data
 */


Timeline.prototype.setData = function (data) {
  if (data && data.groups) {
    this.setGroups(data.groups);
  }

  if (data && data.items) {
    this.setItems(data.items);
  }
};
/**
 * Set selected items by their id. Replaces the current selection
 * Unknown id's are silently ignored.
 * @param {string[] | string} [ids]  An array with zero or more id's of the items to be
 *                                selected. If ids is an empty array, all items will be
 *                                unselected.
 * @param {Object} [options]      Available options:
 *                                `focus: boolean`
 *                                    If true, focus will be set to the selected item(s)
 *                                `animation: boolean | {duration: number, easingFunction: string}`
 *                                    If true (default), the range is animated
 *                                    smoothly to the new window. An object can be
 *                                    provided to specify duration and easing function.
 *                                    Default duration is 500 ms, and default easing
 *                                    function is 'easeInOutQuad'.
 *                                    Only applicable when option focus is true.
 */


Timeline.prototype.setSelection = function (ids, options) {
  this.itemSet && this.itemSet.setSelection(ids);

  if (options && options.focus) {
    this.focus(ids, options);
  }
};
/**
 * Get the selected items by their id
 * @return {Array} ids  The ids of the selected items
 */


Timeline.prototype.getSelection = function () {
  return this.itemSet && this.itemSet.getSelection() || [];
};
/**
 * Adjust the visible window such that the selected item (or multiple items)
 * are centered on screen.
 * @param {string | String[]} id     An item id or array with item ids
 * @param {Object} [options]      Available options:
 *                                `animation: boolean | {duration: number, easingFunction: string}`
 *                                    If true (default), the range is animated
 *                                    smoothly to the new window. An object can be
 *                                    provided to specify duration and easing function.
 *                                    Default duration is 500 ms, and default easing
 *                                    function is 'easeInOutQuad'.
 */


Timeline.prototype.focus = function (id, options) {
  if (!this.itemsData || id == undefined) return;
  var ids = Array.isArray(id) ? id : [id]; // get the specified item(s)

  var itemsData = this.itemsData.getDataSet().get(ids, {
    type: {
      start: 'Date',
      end: 'Date'
    }
  }); // calculate minimum start and maximum end of specified items

  var start = null;
  var end = null;
  itemsData.forEach(function (itemData) {
    var s = itemData.start.valueOf();
    var e = 'end' in itemData ? itemData.end.valueOf() : itemData.start.valueOf();

    if (start === null || s < start) {
      start = s;
    }

    if (end === null || e > end) {
      end = e;
    }
  });

  if (start !== null && end !== null) {
    var me = this; // Use the first item for the vertical focus

    var item = this.itemSet.items[ids[0]];
    var startPos = this._getScrollTop() * -1;
    var initialVerticalScroll = null; // Setup a handler for each frame of the vertical scroll

    var verticalAnimationFrame = function verticalAnimationFrame(ease, willDraw, done) {
      var verticalScroll = getItemVerticalScroll(me, item);

      if (verticalScroll === false) {
        return; // We don't need to scroll, so do nothing
      }

      if (!initialVerticalScroll) {
        initialVerticalScroll = verticalScroll;
      }

      if (initialVerticalScroll.itemTop == verticalScroll.itemTop && !initialVerticalScroll.shouldScroll) {
        return; // We don't need to scroll, so do nothing
      } else if (initialVerticalScroll.itemTop != verticalScroll.itemTop && verticalScroll.shouldScroll) {
        // The redraw shifted elements, so reset the animation to correct
        initialVerticalScroll = verticalScroll;
        startPos = me._getScrollTop() * -1;
      }

      var from = startPos;
      var to = initialVerticalScroll.scrollOffset;
      var scrollTop = done ? to : from + (to - from) * ease;

      me._setScrollTop(-scrollTop);

      if (!willDraw) {
        me._redraw();
      }
    }; // Enforces the final vertical scroll position


    var setFinalVerticalPosition = function setFinalVerticalPosition() {
      var finalVerticalScroll = getItemVerticalScroll(me, item);

      if (finalVerticalScroll.shouldScroll && finalVerticalScroll.itemTop != initialVerticalScroll.itemTop) {
        me._setScrollTop(-finalVerticalScroll.scrollOffset);

        me._redraw();
      }
    }; // Perform one last check at the end to make sure the final vertical
    // position is correct


    var finalVerticalCallback = function finalVerticalCallback() {
      // Double check we ended at the proper scroll position
      setFinalVerticalPosition(); // Let the redraw settle and finalize the position.      

      setTimeout(setFinalVerticalPosition, 100);
    }; // calculate the new middle and interval for the window


    var middle = (start + end) / 2;
    var interval = Math.max(this.range.end - this.range.start, (end - start) * 1.1);
    var animation = options && options.animation !== undefined ? options.animation : true;

    if (!animation) {
      // We aren't animating so set a default so that the final callback forces the vertical location
      initialVerticalScroll = {
        shouldScroll: false,
        scrollOffset: -1,
        itemTop: -1
      };
    }

    this.range.setRange(middle - interval / 2, middle + interval / 2, {
      animation: animation
    }, finalVerticalCallback, verticalAnimationFrame);
  }
};
/**
 * Set Timeline window such that it fits all items
 * @param {Object} [options]  Available options:
 *                                `animation: boolean | {duration: number, easingFunction: string}`
 *                                    If true (default), the range is animated
 *                                    smoothly to the new window. An object can be
 *                                    provided to specify duration and easing function.
 *                                    Default duration is 500 ms, and default easing
 *                                    function is 'easeInOutQuad'.
 * @param {function} [callback]
 */


Timeline.prototype.fit = function (options, callback) {
  var animation = options && options.animation !== undefined ? options.animation : true;
  var range;
  var dataset = this.itemsData && this.itemsData.getDataSet();

  if (dataset.length === 1 && dataset.get()[0].end === undefined) {
    // a single item -> don't fit, just show a range around the item from -4 to +3 days
    range = this.getDataRange();
    this.moveTo(range.min.valueOf(), {
      animation: animation
    }, callback);
  } else {
    // exactly fit the items (plus a small margin)
    range = this.getItemRange();
    this.range.setRange(range.min, range.max, {
      animation: animation
    }, callback);
  }
};
/**
 *
 * @param {vis.Item} item
 * @returns {number}
 */


function getStart(item) {
  return util.convert(item.data.start, 'Date').valueOf();
}
/**
 *
 * @param {vis.Item} item
 * @returns {number}
 */


function getEnd(item) {
  var end = item.data.end != undefined ? item.data.end : item.data.start;
  return util.convert(end, 'Date').valueOf();
}
/**
 * @param {vis.Timeline} timeline
 * @param {vis.Item} item
 * @return {{shouldScroll: bool, scrollOffset: number, itemTop: number}}
 */


function getItemVerticalScroll(timeline, item) {
  if (!item.parent) {
    // The item no longer exists, so ignore this focus.
    return false;
  }

  var leftHeight = timeline.props.leftContainer.height;
  var contentHeight = timeline.props.left.height;
  var group = item.parent;
  var offset = group.top;
  var shouldScroll = true;
  var orientation = timeline.timeAxis.options.orientation.axis;

  var itemTop = function itemTop() {
    if (orientation == "bottom") {
      return group.height - item.top - item.height;
    } else {
      return item.top;
    }
  };

  var currentScrollHeight = timeline._getScrollTop() * -1;
  var targetOffset = offset + itemTop();
  var height = item.height;

  if (targetOffset < currentScrollHeight) {
    if (offset + leftHeight <= offset + itemTop() + height) {
      offset += itemTop() - timeline.itemSet.options.margin.item.vertical;
    }
  } else if (targetOffset + height > currentScrollHeight + leftHeight) {
    offset += itemTop() + height - leftHeight + timeline.itemSet.options.margin.item.vertical;
  } else {
    shouldScroll = false;
  }

  offset = Math.min(offset, contentHeight - leftHeight);
  return {
    shouldScroll: shouldScroll,
    scrollOffset: offset,
    itemTop: targetOffset
  };
}
/**
 * Determine the range of the items, taking into account their actual width
 * and a margin of 10 pixels on both sides.
 *
 * @returns {{min: Date, max: Date}}
 */


Timeline.prototype.getItemRange = function () {
  // get a rough approximation for the range based on the items start and end dates
  var range = this.getDataRange();
  var min = range.min !== null ? range.min.valueOf() : null;
  var max = range.max !== null ? range.max.valueOf() : null;
  var minItem = null;
  var maxItem = null;

  if (min != null && max != null) {
    var interval = max - min; // ms

    if (interval <= 0) {
      interval = 10;
    }

    var factor = interval / this.props.center.width;
    var redrawQueue = {};
    var redrawQueueLength = 0; // collect redraw functions

    util.forEach(this.itemSet.items, function (item, key) {
      if (item.groupShowing) {
        var returnQueue = true;
        redrawQueue[key] = item.redraw(returnQueue);
        redrawQueueLength = redrawQueue[key].length;
      }
    });
    var needRedraw = redrawQueueLength > 0;

    if (needRedraw) {
      // redraw all regular items
      for (var i = 0; i < redrawQueueLength; i++) {
        util.forEach(redrawQueue, function (fns) {
          fns[i]();
        });
      }
    } // calculate the date of the left side and right side of the items given


    util.forEach(this.itemSet.items, function (item) {
      var start = getStart(item);
      var end = getEnd(item);
      var startSide;
      var endSide;

      if (this.options.rtl) {
        startSide = start - (item.getWidthRight() + 10) * factor;
        endSide = end + (item.getWidthLeft() + 10) * factor;
      } else {
        startSide = start - (item.getWidthLeft() + 10) * factor;
        endSide = end + (item.getWidthRight() + 10) * factor;
      }

      if (startSide < min) {
        min = startSide;
        minItem = item;
      }

      if (endSide > max) {
        max = endSide;
        maxItem = item;
      }
    }.bind(this));

    if (minItem && maxItem) {
      var lhs = minItem.getWidthLeft() + 10;
      var rhs = maxItem.getWidthRight() + 10;
      var delta = this.props.center.width - lhs - rhs; // px

      if (delta > 0) {
        if (this.options.rtl) {
          min = getStart(minItem) - rhs * interval / delta; // ms

          max = getEnd(maxItem) + lhs * interval / delta; // ms
        } else {
          min = getStart(minItem) - lhs * interval / delta; // ms

          max = getEnd(maxItem) + rhs * interval / delta; // ms
        }
      }
    }
  }

  return {
    min: min != null ? new Date(min) : null,
    max: max != null ? new Date(max) : null
  };
};
/**
 * Calculate the data range of the items start and end dates
 * @returns {{min: Date, max: Date}}
 */


Timeline.prototype.getDataRange = function () {
  var min = null;
  var max = null;
  var dataset = this.itemsData && this.itemsData.getDataSet();

  if (dataset) {
    dataset.forEach(function (item) {
      var start = util.convert(item.start, 'Date').valueOf();
      var end = util.convert(item.end != undefined ? item.end : item.start, 'Date').valueOf();

      if (min === null || start < min) {
        min = start;
      }

      if (max === null || end > max) {
        max = end;
      }
    });
  }

  return {
    min: min != null ? new Date(min) : null,
    max: max != null ? new Date(max) : null
  };
};
/**
 * Generate Timeline related information from an event
 * @param {Event} event
 * @return {Object} An object with related information, like on which area
 *                  The event happened, whether clicked on an item, etc.
 */


Timeline.prototype.getEventProperties = function (event) {
  var clientX = event.center ? event.center.x : event.clientX;
  var clientY = event.center ? event.center.y : event.clientY;
  var x;

  if (this.options.rtl) {
    x = util.getAbsoluteRight(this.dom.centerContainer) - clientX;
  } else {
    x = clientX - util.getAbsoluteLeft(this.dom.centerContainer);
  }

  var y = clientY - util.getAbsoluteTop(this.dom.centerContainer);
  var item = this.itemSet.itemFromTarget(event);
  var group = this.itemSet.groupFromTarget(event);
  var customTime = CustomTime.customTimeFromTarget(event);
  var snap = this.itemSet.options.snap || null;
  var scale = this.body.util.getScale();
  var step = this.body.util.getStep();

  var time = this._toTime(x);

  var snappedTime = snap ? snap(time, scale, step) : time;
  var element = util.getTarget(event);
  var what = null;

  if (item != null) {
    what = 'item';
  } else if (customTime != null) {
    what = 'custom-time';
  } else if (util.hasParent(element, this.timeAxis.dom.foreground)) {
    what = 'axis';
  } else if (this.timeAxis2 && util.hasParent(element, this.timeAxis2.dom.foreground)) {
    what = 'axis';
  } else if (util.hasParent(element, this.itemSet.dom.labelSet)) {
    what = 'group-label';
  } else if (util.hasParent(element, this.currentTime.bar)) {
    what = 'current-time';
  } else if (util.hasParent(element, this.dom.center)) {
    what = 'background';
  }

  return {
    event: event,
    item: item ? item.id : null,
    group: group ? group.groupId : null,
    what: what,
    pageX: event.srcEvent ? event.srcEvent.pageX : event.pageX,
    pageY: event.srcEvent ? event.srcEvent.pageY : event.pageY,
    x: x,
    y: y,
    time: time,
    snappedTime: snappedTime
  };
};
/**
 * Toggle Timeline rolling mode
 */


Timeline.prototype.toggleRollingMode = function () {
  if (this.range.rolling) {
    this.range.stopRolling();
  } else {
    if (this.options.rollingMode == undefined) {
      this.setOptions(this.options);
    }

    this.range.startRolling();
  }
};

var Timeline_1 = Timeline;

/**
 *
 * @param {number} start
 * @param {number} end
 * @param {boolean} autoScaleStart
 * @param {boolean} autoScaleEnd
 * @param {number} containerHeight
 * @param {number} majorCharHeight
 * @param {boolean} zeroAlign
 * @param {function} formattingFunction
 * @constructor DataScale
 */
function DataScale(start, end, autoScaleStart, autoScaleEnd, containerHeight, majorCharHeight) {
  var zeroAlign = arguments.length > 6 && arguments[6] !== undefined ? arguments[6] : false;
  var formattingFunction = arguments.length > 7 && arguments[7] !== undefined ? arguments[7] : false;
  this.majorSteps = [1, 2, 5, 10];
  this.minorSteps = [0.25, 0.5, 1, 2];
  this.customLines = null;
  this.containerHeight = containerHeight;
  this.majorCharHeight = majorCharHeight;
  this._start = start;
  this._end = end;
  this.scale = 1;
  this.minorStepIdx = -1;
  this.magnitudefactor = 1;
  this.determineScale();
  this.zeroAlign = zeroAlign;
  this.autoScaleStart = autoScaleStart;
  this.autoScaleEnd = autoScaleEnd;
  this.formattingFunction = formattingFunction;

  if (autoScaleStart || autoScaleEnd) {
    var me = this;

    var roundToMinor = function roundToMinor(value) {
      var rounded = value - value % (me.magnitudefactor * me.minorSteps[me.minorStepIdx]);

      if (value % (me.magnitudefactor * me.minorSteps[me.minorStepIdx]) > 0.5 * (me.magnitudefactor * me.minorSteps[me.minorStepIdx])) {
        return rounded + me.magnitudefactor * me.minorSteps[me.minorStepIdx];
      } else {
        return rounded;
      }
    };

    if (autoScaleStart) {
      this._start -= this.magnitudefactor * 2 * this.minorSteps[this.minorStepIdx];
      this._start = roundToMinor(this._start);
    }

    if (autoScaleEnd) {
      this._end += this.magnitudefactor * this.minorSteps[this.minorStepIdx];
      this._end = roundToMinor(this._end);
    }

    this.determineScale();
  }
}

DataScale.prototype.setCharHeight = function (majorCharHeight) {
  this.majorCharHeight = majorCharHeight;
};

DataScale.prototype.setHeight = function (containerHeight) {
  this.containerHeight = containerHeight;
};

DataScale.prototype.determineScale = function () {
  var range = this._end - this._start;
  this.scale = this.containerHeight / range;
  var minimumStepValue = this.majorCharHeight / this.scale;
  var orderOfMagnitude = range > 0 ? Math.round(Math.log(range) / Math.LN10) : 0;
  this.minorStepIdx = -1;
  this.magnitudefactor = Math.pow(10, orderOfMagnitude);
  var start = 0;

  if (orderOfMagnitude < 0) {
    start = orderOfMagnitude;
  }

  var solutionFound = false;

  for (var l = start; Math.abs(l) <= Math.abs(orderOfMagnitude); l++) {
    this.magnitudefactor = Math.pow(10, l);

    for (var j = 0; j < this.minorSteps.length; j++) {
      var stepSize = this.magnitudefactor * this.minorSteps[j];

      if (stepSize >= minimumStepValue) {
        solutionFound = true;
        this.minorStepIdx = j;
        break;
      }
    }

    if (solutionFound === true) {
      break;
    }
  }
};

DataScale.prototype.is_major = function (value) {
  return value % (this.magnitudefactor * this.majorSteps[this.minorStepIdx]) === 0;
};

DataScale.prototype.getStep = function () {
  return this.magnitudefactor * this.minorSteps[this.minorStepIdx];
};

DataScale.prototype.getFirstMajor = function () {
  var majorStep = this.magnitudefactor * this.majorSteps[this.minorStepIdx];
  return this.convertValue(this._start + (majorStep - this._start % majorStep) % majorStep);
};

DataScale.prototype.formatValue = function (current) {
  var returnValue = current.toPrecision(5);

  if (typeof this.formattingFunction === 'function') {
    returnValue = this.formattingFunction(current);
  }

  if (typeof returnValue === 'number') {
    return '' + returnValue;
  } else if (typeof returnValue === 'string') {
    return returnValue;
  } else {
    return current.toPrecision(5);
  }
};

DataScale.prototype.getLines = function () {
  var lines = [];
  var step = this.getStep();
  var bottomOffset = (step - this._start % step) % step;

  for (var i = this._start + bottomOffset; this._end - i > 0.00001; i += step) {
    if (i != this._start) {
      //Skip the bottom line
      lines.push({
        major: this.is_major(i),
        y: this.convertValue(i),
        val: this.formatValue(i)
      });
    }
  }

  return lines;
};

DataScale.prototype.followScale = function (other) {
  var oldStepIdx = this.minorStepIdx;
  var oldStart = this._start;
  var oldEnd = this._end;
  var me = this;

  var increaseMagnitude = function increaseMagnitude() {
    me.magnitudefactor *= 2;
  };

  var decreaseMagnitude = function decreaseMagnitude() {
    me.magnitudefactor /= 2;
  };

  if (other.minorStepIdx <= 1 && this.minorStepIdx <= 1 || other.minorStepIdx > 1 && this.minorStepIdx > 1) ; else if (other.minorStepIdx < this.minorStepIdx) {
    //I'm 5, they are 4 per major.
    this.minorStepIdx = 1;

    if (oldStepIdx == 2) {
      increaseMagnitude();
    } else {
      increaseMagnitude();
      increaseMagnitude();
    }
  } else {
    //I'm 4, they are 5 per major
    this.minorStepIdx = 2;

    if (oldStepIdx == 1) {
      decreaseMagnitude();
    } else {
      decreaseMagnitude();
      decreaseMagnitude();
    }
  } //Get masters stats:


  var otherZero = other.convertValue(0);
  var otherStep = other.getStep() * other.scale;
  var done = false;
  var count = 0; //Loop until magnitude is correct for given constrains.

  while (!done && count++ < 5) {
    //Get my stats:
    this.scale = otherStep / (this.minorSteps[this.minorStepIdx] * this.magnitudefactor);
    var newRange = this.containerHeight / this.scale; //For the case the magnitudefactor has changed:

    this._start = oldStart;
    this._end = this._start + newRange;
    var myOriginalZero = this._end * this.scale;
    var majorStep = this.magnitudefactor * this.majorSteps[this.minorStepIdx];
    var majorOffset = this.getFirstMajor() - other.getFirstMajor();

    if (this.zeroAlign) {
      var zeroOffset = otherZero - myOriginalZero;
      this._end += zeroOffset / this.scale;
      this._start = this._end - newRange;
    } else {
      if (!this.autoScaleStart) {
        this._start += majorStep - majorOffset / this.scale;
        this._end = this._start + newRange;
      } else {
        this._start -= majorOffset / this.scale;
        this._end = this._start + newRange;
      }
    }

    if (!this.autoScaleEnd && this._end > oldEnd + 0.00001) {
      //Need to decrease magnitude to prevent scale overshoot! (end)
      decreaseMagnitude();
      done = false;
      continue;
    }

    if (!this.autoScaleStart && this._start < oldStart - 0.00001) {
      if (this.zeroAlign && oldStart >= 0) {
        console.warn("Can't adhere to given 'min' range, due to zeroalign");
      } else {
        //Need to decrease magnitude to prevent scale overshoot! (start)
        decreaseMagnitude();
        done = false;
        continue;
      }
    }

    if (this.autoScaleStart && this.autoScaleEnd && newRange < oldEnd - oldStart) {
      increaseMagnitude();
      done = false;
      continue;
    }

    done = true;
  }
};

DataScale.prototype.convertValue = function (value) {
  return this.containerHeight - (value - this._start) * this.scale;
};

DataScale.prototype.screenToValue = function (pixels) {
  return (this.containerHeight - pixels) / this.scale + this._start;
};

var DataScale_1 = DataScale;

/**
 * A horizontal time axis
 * @param {Object} body
 * @param {Object} [options]        See DataAxis.setOptions for the available
 *                                  options.
 * @param {SVGElement} svg
 * @param {vis.LineGraph.options} linegraphOptions
 * @constructor DataAxis
 * @extends Component
 */

function DataAxis(body, options, svg, linegraphOptions) {
  this.id = util.randomUUID();
  this.body = body;
  this.defaultOptions = {
    orientation: 'left',
    // supported: 'left', 'right'
    showMinorLabels: true,
    showMajorLabels: true,
    icons: false,
    majorLinesOffset: 7,
    minorLinesOffset: 4,
    labelOffsetX: 10,
    labelOffsetY: 2,
    iconWidth: 20,
    width: '40px',
    visible: true,
    alignZeros: true,
    left: {
      range: {
        min: undefined,
        max: undefined
      },
      format: function format(value) {
        return '' + parseFloat(value.toPrecision(3));
      },
      title: {
        text: undefined,
        style: undefined
      }
    },
    right: {
      range: {
        min: undefined,
        max: undefined
      },
      format: function format(value) {
        return '' + parseFloat(value.toPrecision(3));
      },
      title: {
        text: undefined,
        style: undefined
      }
    }
  };
  this.linegraphOptions = linegraphOptions;
  this.linegraphSVG = svg;
  this.props = {};
  this.DOMelements = {
    // dynamic elements
    lines: {},
    labels: {},
    title: {}
  };
  this.dom = {};
  this.scale = undefined;
  this.range = {
    start: 0,
    end: 0
  };
  this.options = util.extend({}, this.defaultOptions);
  this.conversionFactor = 1;
  this.setOptions(options);
  this.width = Number(('' + this.options.width).replace("px", ""));
  this.minWidth = this.width;
  this.height = this.linegraphSVG.getBoundingClientRect().height;
  this.hidden = false;
  this.stepPixels = 25;
  this.zeroCrossing = -1;
  this.amountOfSteps = -1;
  this.lineOffset = 0;
  this.master = true;
  this.masterAxis = null;
  this.svgElements = {};
  this.iconsRemoved = false;
  this.groups = {};
  this.amountOfGroups = 0; // create the HTML DOM

  this._create();

  if (this.scale == undefined) {
    this._redrawLabels();
  }

  this.framework = {
    svg: this.svg,
    svgElements: this.svgElements,
    options: this.options,
    groups: this.groups
  };
  var me = this;
  this.body.emitter.on("verticalDrag", function () {
    me.dom.lineContainer.style.top = me.body.domProps.scrollTop + 'px';
  });
}

DataAxis.prototype = new Component_1();

DataAxis.prototype.addGroup = function (label, graphOptions) {
  if (!this.groups.hasOwnProperty(label)) {
    this.groups[label] = graphOptions;
  }

  this.amountOfGroups += 1;
};

DataAxis.prototype.updateGroup = function (label, graphOptions) {
  if (!this.groups.hasOwnProperty(label)) {
    this.amountOfGroups += 1;
  }

  this.groups[label] = graphOptions;
};

DataAxis.prototype.removeGroup = function (label) {
  if (this.groups.hasOwnProperty(label)) {
    delete this.groups[label];
    this.amountOfGroups -= 1;
  }
};

DataAxis.prototype.setOptions = function (options) {
  if (options) {
    var redraw = false;

    if (this.options.orientation != options.orientation && options.orientation !== undefined) {
      redraw = true;
    }

    var fields = ['orientation', 'showMinorLabels', 'showMajorLabels', 'icons', 'majorLinesOffset', 'minorLinesOffset', 'labelOffsetX', 'labelOffsetY', 'iconWidth', 'width', 'visible', 'left', 'right', 'alignZeros'];
    util.selectiveDeepExtend(fields, this.options, options);
    this.minWidth = Number(('' + this.options.width).replace("px", ""));

    if (redraw === true && this.dom.frame) {
      this.hide();
      this.show();
    }
  }
};
/**
 * Create the HTML DOM for the DataAxis
 */


DataAxis.prototype._create = function () {
  this.dom.frame = document.createElement('div');
  this.dom.frame.style.width = this.options.width;
  this.dom.frame.style.height = this.height;
  this.dom.lineContainer = document.createElement('div');
  this.dom.lineContainer.style.width = '100%';
  this.dom.lineContainer.style.height = this.height;
  this.dom.lineContainer.style.position = 'relative';
  this.dom.lineContainer.style.visibility = 'visible';
  this.dom.lineContainer.style.display = 'block'; // create svg element for graph drawing.

  this.svg = document.createElementNS('http://www.w3.org/2000/svg', "svg");
  this.svg.style.position = "absolute";
  this.svg.style.top = '0px';
  this.svg.style.height = '100%';
  this.svg.style.width = '100%';
  this.svg.style.display = "block";
  this.dom.frame.appendChild(this.svg);
};

DataAxis.prototype._redrawGroupIcons = function () {
  DOMutil.prepareElements(this.svgElements);
  var x;
  var iconWidth = this.options.iconWidth;
  var iconHeight = 15;
  var iconOffset = 4;
  var y = iconOffset + 0.5 * iconHeight;

  if (this.options.orientation === 'left') {
    x = iconOffset;
  } else {
    x = this.width - iconWidth - iconOffset;
  }

  var groupArray = Object.keys(this.groups);
  groupArray.sort(function (a, b) {
    return a < b ? -1 : 1;
  });

  for (var i = 0; i < groupArray.length; i++) {
    var groupId = groupArray[i];

    if (this.groups[groupId].visible === true && (this.linegraphOptions.visibility[groupId] === undefined || this.linegraphOptions.visibility[groupId] === true)) {
      this.groups[groupId].getLegend(iconWidth, iconHeight, this.framework, x, y);
      y += iconHeight + iconOffset;
    }
  }

  DOMutil.cleanupElements(this.svgElements);
  this.iconsRemoved = false;
};

DataAxis.prototype._cleanupIcons = function () {
  if (this.iconsRemoved === false) {
    DOMutil.prepareElements(this.svgElements);
    DOMutil.cleanupElements(this.svgElements);
    this.iconsRemoved = true;
  }
};
/**
 * Create the HTML DOM for the DataAxis
 */


DataAxis.prototype.show = function () {
  this.hidden = false;

  if (!this.dom.frame.parentNode) {
    if (this.options.orientation === 'left') {
      this.body.dom.left.appendChild(this.dom.frame);
    } else {
      this.body.dom.right.appendChild(this.dom.frame);
    }
  }

  if (!this.dom.lineContainer.parentNode) {
    this.body.dom.backgroundHorizontal.appendChild(this.dom.lineContainer);
  }

  this.dom.lineContainer.style.display = 'block';
};
/**
 * Create the HTML DOM for the DataAxis
 */


DataAxis.prototype.hide = function () {
  this.hidden = true;

  if (this.dom.frame.parentNode) {
    this.dom.frame.parentNode.removeChild(this.dom.frame);
  }

  this.dom.lineContainer.style.display = 'none';
};
/**
 * Set a range (start and end)
 * @param {number} start
 * @param {number} end
 */


DataAxis.prototype.setRange = function (start, end) {
  this.range.start = start;
  this.range.end = end;
};
/**
 * Repaint the component
 * @return {boolean} Returns true if the component is resized
 */


DataAxis.prototype.redraw = function () {
  var resized = false;
  var activeGroups = 0; // Make sure the line container adheres to the vertical scrolling.

  this.dom.lineContainer.style.top = this.body.domProps.scrollTop + 'px';

  for (var groupId in this.groups) {
    if (this.groups.hasOwnProperty(groupId)) {
      if (this.groups[groupId].visible === true && (this.linegraphOptions.visibility[groupId] === undefined || this.linegraphOptions.visibility[groupId] === true)) {
        activeGroups++;
      }
    }
  }

  if (this.amountOfGroups === 0 || activeGroups === 0) {
    this.hide();
  } else {
    this.show();
    this.height = Number(this.linegraphSVG.style.height.replace("px", "")); // svg offsetheight did not work in firefox and explorer...

    this.dom.lineContainer.style.height = this.height + 'px';
    this.width = this.options.visible === true ? Number(('' + this.options.width).replace("px", "")) : 0;
    var props = this.props;
    var frame = this.dom.frame; // update classname

    frame.className = 'vis-data-axis'; // calculate character width and height

    this._calculateCharSize();

    var orientation = this.options.orientation;
    var showMinorLabels = this.options.showMinorLabels;
    var showMajorLabels = this.options.showMajorLabels; // determine the width and height of the elements for the axis

    props.minorLabelHeight = showMinorLabels ? props.minorCharHeight : 0;
    props.majorLabelHeight = showMajorLabels ? props.majorCharHeight : 0;
    props.minorLineWidth = this.body.dom.backgroundHorizontal.offsetWidth - this.lineOffset - this.width + 2 * this.options.minorLinesOffset;
    props.minorLineHeight = 1;
    props.majorLineWidth = this.body.dom.backgroundHorizontal.offsetWidth - this.lineOffset - this.width + 2 * this.options.majorLinesOffset;
    props.majorLineHeight = 1; //  take frame offline while updating (is almost twice as fast)

    if (orientation === 'left') {
      frame.style.top = '0';
      frame.style.left = '0';
      frame.style.bottom = '';
      frame.style.width = this.width + 'px';
      frame.style.height = this.height + "px";
      this.props.width = this.body.domProps.left.width;
      this.props.height = this.body.domProps.left.height;
    } else {
      // right
      frame.style.top = '';
      frame.style.bottom = '0';
      frame.style.left = '0';
      frame.style.width = this.width + 'px';
      frame.style.height = this.height + "px";
      this.props.width = this.body.domProps.right.width;
      this.props.height = this.body.domProps.right.height;
    }

    resized = this._redrawLabels();
    resized = this._isResized() || resized;

    if (this.options.icons === true) {
      this._redrawGroupIcons();
    } else {
      this._cleanupIcons();
    }

    this._redrawTitle(orientation);
  }

  return resized;
};
/**
 * Repaint major and minor text labels and vertical grid lines
 *
 * @returns {boolean}
 * @private
 */


DataAxis.prototype._redrawLabels = function () {
  var _this = this;

  var resized = false;
  DOMutil.prepareElements(this.DOMelements.lines);
  DOMutil.prepareElements(this.DOMelements.labels);
  var orientation = this.options['orientation'];
  var customRange = this.options[orientation].range != undefined ? this.options[orientation].range : {}; //Override range with manual options:

  var autoScaleEnd = true;

  if (customRange.max != undefined) {
    this.range.end = customRange.max;
    autoScaleEnd = false;
  }

  var autoScaleStart = true;

  if (customRange.min != undefined) {
    this.range.start = customRange.min;
    autoScaleStart = false;
  }

  this.scale = new DataScale_1(this.range.start, this.range.end, autoScaleStart, autoScaleEnd, this.dom.frame.offsetHeight, this.props.majorCharHeight, this.options.alignZeros, this.options[orientation].format);

  if (this.master === false && this.masterAxis != undefined) {
    this.scale.followScale(this.masterAxis.scale);
    this.dom.lineContainer.style.display = 'none';
  } else {
    this.dom.lineContainer.style.display = 'block';
  } //Is updated in side-effect of _redrawLabel():


  this.maxLabelSize = 0;
  var lines = this.scale.getLines();
  lines.forEach(function (line) {
    var y = line.y;
    var isMajor = line.major;

    if (_this.options['showMinorLabels'] && isMajor === false) {
      _this._redrawLabel(y - 2, line.val, orientation, 'vis-y-axis vis-minor', _this.props.minorCharHeight);
    }

    if (isMajor) {
      if (y >= 0) {
        _this._redrawLabel(y - 2, line.val, orientation, 'vis-y-axis vis-major', _this.props.majorCharHeight);
      }
    }

    if (_this.master === true) {
      if (isMajor) {
        _this._redrawLine(y, orientation, 'vis-grid vis-horizontal vis-major', _this.options.majorLinesOffset, _this.props.majorLineWidth);
      } else {
        _this._redrawLine(y, orientation, 'vis-grid vis-horizontal vis-minor', _this.options.minorLinesOffset, _this.props.minorLineWidth);
      }
    }
  }); // Note that title is rotated, so we're using the height, not width!

  var titleWidth = 0;

  if (this.options[orientation].title !== undefined && this.options[orientation].title.text !== undefined) {
    titleWidth = this.props.titleCharHeight;
  }

  var offset = this.options.icons === true ? Math.max(this.options.iconWidth, titleWidth) + this.options.labelOffsetX + 15 : titleWidth + this.options.labelOffsetX + 15; // this will resize the yAxis to accommodate the labels.

  if (this.maxLabelSize > this.width - offset && this.options.visible === true) {
    this.width = this.maxLabelSize + offset;
    this.options.width = this.width + "px";
    DOMutil.cleanupElements(this.DOMelements.lines);
    DOMutil.cleanupElements(this.DOMelements.labels);
    this.redraw();
    resized = true;
  } // this will resize the yAxis if it is too big for the labels.
  else if (this.maxLabelSize < this.width - offset && this.options.visible === true && this.width > this.minWidth) {
      this.width = Math.max(this.minWidth, this.maxLabelSize + offset);
      this.options.width = this.width + "px";
      DOMutil.cleanupElements(this.DOMelements.lines);
      DOMutil.cleanupElements(this.DOMelements.labels);
      this.redraw();
      resized = true;
    } else {
      DOMutil.cleanupElements(this.DOMelements.lines);
      DOMutil.cleanupElements(this.DOMelements.labels);
      resized = false;
    }

  return resized;
};

DataAxis.prototype.convertValue = function (value) {
  return this.scale.convertValue(value);
};

DataAxis.prototype.screenToValue = function (x) {
  return this.scale.screenToValue(x);
};
/**
 * Create a label for the axis at position x
 *
 * @param {number} y
 * @param {string} text
 * @param {'top'|'right'|'bottom'|'left'} orientation
 * @param {string} className
 * @param {number} characterHeight
 * @private
 */


DataAxis.prototype._redrawLabel = function (y, text, orientation, className, characterHeight) {
  // reuse redundant label
  var label = DOMutil.getDOMElement('div', this.DOMelements.labels, this.dom.frame); //this.dom.redundant.labels.shift();

  label.className = className;
  label.innerHTML = text;

  if (orientation === 'left') {
    label.style.left = '-' + this.options.labelOffsetX + 'px';
    label.style.textAlign = "right";
  } else {
    label.style.right = '-' + this.options.labelOffsetX + 'px';
    label.style.textAlign = "left";
  }

  label.style.top = y - 0.5 * characterHeight + this.options.labelOffsetY + 'px';
  text += '';
  var largestWidth = Math.max(this.props.majorCharWidth, this.props.minorCharWidth);

  if (this.maxLabelSize < text.length * largestWidth) {
    this.maxLabelSize = text.length * largestWidth;
  }
};
/**
 * Create a minor line for the axis at position y
 * @param {number} y
 * @param {'top'|'right'|'bottom'|'left'} orientation
 * @param {string} className
 * @param {number} offset
 * @param {number} width
 */


DataAxis.prototype._redrawLine = function (y, orientation, className, offset, width) {
  if (this.master === true) {
    var line = DOMutil.getDOMElement('div', this.DOMelements.lines, this.dom.lineContainer); //this.dom.redundant.lines.shift();

    line.className = className;
    line.innerHTML = '';

    if (orientation === 'left') {
      line.style.left = this.width - offset + 'px';
    } else {
      line.style.right = this.width - offset + 'px';
    }

    line.style.width = width + 'px';
    line.style.top = y + 'px';
  }
};
/**
 * Create a title for the axis
 * @private
 * @param {'top'|'right'|'bottom'|'left'} orientation
 */


DataAxis.prototype._redrawTitle = function (orientation) {
  DOMutil.prepareElements(this.DOMelements.title); // Check if the title is defined for this axes

  if (this.options[orientation].title !== undefined && this.options[orientation].title.text !== undefined) {
    var title = DOMutil.getDOMElement('div', this.DOMelements.title, this.dom.frame);
    title.className = 'vis-y-axis vis-title vis-' + orientation;
    title.innerHTML = this.options[orientation].title.text; // Add style - if provided

    if (this.options[orientation].title.style !== undefined) {
      util.addCssText(title, this.options[orientation].title.style);
    }

    if (orientation === 'left') {
      title.style.left = this.props.titleCharHeight + 'px';
    } else {
      title.style.right = this.props.titleCharHeight + 'px';
    }

    title.style.width = this.height + 'px';
  } // we need to clean up in case we did not use all elements.


  DOMutil.cleanupElements(this.DOMelements.title);
};
/**
 * Determine the size of text on the axis (both major and minor axis).
 * The size is calculated only once and then cached in this.props.
 * @private
 */


DataAxis.prototype._calculateCharSize = function () {
  // determine the char width and height on the minor axis
  if (!('minorCharHeight' in this.props)) {
    var textMinor = document.createTextNode('0');
    var measureCharMinor = document.createElement('div');
    measureCharMinor.className = 'vis-y-axis vis-minor vis-measure';
    measureCharMinor.appendChild(textMinor);
    this.dom.frame.appendChild(measureCharMinor);
    this.props.minorCharHeight = measureCharMinor.clientHeight;
    this.props.minorCharWidth = measureCharMinor.clientWidth;
    this.dom.frame.removeChild(measureCharMinor);
  }

  if (!('majorCharHeight' in this.props)) {
    var textMajor = document.createTextNode('0');
    var measureCharMajor = document.createElement('div');
    measureCharMajor.className = 'vis-y-axis vis-major vis-measure';
    measureCharMajor.appendChild(textMajor);
    this.dom.frame.appendChild(measureCharMajor);
    this.props.majorCharHeight = measureCharMajor.clientHeight;
    this.props.majorCharWidth = measureCharMajor.clientWidth;
    this.dom.frame.removeChild(measureCharMajor);
  }

  if (!('titleCharHeight' in this.props)) {
    var textTitle = document.createTextNode('0');
    var measureCharTitle = document.createElement('div');
    measureCharTitle.className = 'vis-y-axis vis-title vis-measure';
    measureCharTitle.appendChild(textTitle);
    this.dom.frame.appendChild(measureCharTitle);
    this.props.titleCharHeight = measureCharTitle.clientHeight;
    this.props.titleCharWidth = measureCharTitle.clientWidth;
    this.dom.frame.removeChild(measureCharTitle);
  }
};

/**
 *
 * @param {number | string} groupId
 * @param {Object} options   // TODO: Describe options
 *
 * @constructor Points
 */

function Points(groupId, options) {} // eslint-disable-line no-unused-vars

/**
 * draw the data points
 *
 * @param {Array} dataset
 * @param {GraphGroup} group
 * @param {Object} framework            | SVG DOM element
 * @param {number} [offset]
 */


Points.draw = function (dataset, group, framework, offset) {
  offset = offset || 0;
  var callback = getCallback(framework, group);

  for (var i = 0; i < dataset.length; i++) {
    if (!callback) {
      // draw the point the simple way.
      DOMutil.drawPoint(dataset[i].screen_x + offset, dataset[i].screen_y, getGroupTemplate(group), framework.svgElements, framework.svg, dataset[i].label);
    } else {
      var callbackResult = callback(dataset[i], group); // result might be true, false or an object

      if (callbackResult === true || _typeof$1(callbackResult) === 'object') {
        DOMutil.drawPoint(dataset[i].screen_x + offset, dataset[i].screen_y, getGroupTemplate(group, callbackResult), framework.svgElements, framework.svg, dataset[i].label);
      }
    }
  }
};

Points.drawIcon = function (group, x, y, iconWidth, iconHeight, framework) {
  var fillHeight = iconHeight * 0.5;
  var outline = DOMutil.getSVGElement("rect", framework.svgElements, framework.svg);
  outline.setAttributeNS(null, "x", x);
  outline.setAttributeNS(null, "y", y - fillHeight);
  outline.setAttributeNS(null, "width", iconWidth);
  outline.setAttributeNS(null, "height", 2 * fillHeight);
  outline.setAttributeNS(null, "class", "vis-outline"); //Don't call callback on icon

  DOMutil.drawPoint(x + 0.5 * iconWidth, y, getGroupTemplate(group), framework.svgElements, framework.svg);
};
/**
 *
 * @param {vis.Group} group
 * @param {any} callbackResult
 * @returns {{style: *, styles: (*|string), size: *, className: *}}
 */


function getGroupTemplate(group, callbackResult) {
  callbackResult = typeof callbackResult === 'undefined' ? {} : callbackResult;
  return {
    style: callbackResult.style || group.options.drawPoints.style,
    styles: callbackResult.styles || group.options.drawPoints.styles,
    size: callbackResult.size || group.options.drawPoints.size,
    className: callbackResult.className || group.className
  };
}
/**
 *
 * @param {Object} framework            | SVG DOM element
 * @param {vis.Group} group
 * @returns {function}
 */


function getCallback(framework, group) {
  var callback = undefined; // check for the graph2d onRender

  if (framework.options && framework.options.drawPoints && framework.options.drawPoints.onRender && typeof framework.options.drawPoints.onRender == 'function') {
    callback = framework.options.drawPoints.onRender;
  } // override it with the group onRender if defined


  if (group.group.options && group.group.options.drawPoints && group.group.options.drawPoints.onRender && typeof group.group.options.drawPoints.onRender == 'function') {
    callback = group.group.options.drawPoints.onRender;
  }

  return callback;
}

var points = Points;

/**
 *
 * @param {vis.GraphGroup.id} groupId
 * @param {Object} options   // TODO: Describe options
 * @constructor Bargraph
 */

function Bargraph(groupId, options) {// eslint-disable-line no-unused-vars
}

Bargraph.drawIcon = function (group, x, y, iconWidth, iconHeight, framework) {
  var fillHeight = iconHeight * 0.5;
  var outline = DOMutil.getSVGElement("rect", framework.svgElements, framework.svg);
  outline.setAttributeNS(null, "x", x);
  outline.setAttributeNS(null, "y", y - fillHeight);
  outline.setAttributeNS(null, "width", iconWidth);
  outline.setAttributeNS(null, "height", 2 * fillHeight);
  outline.setAttributeNS(null, "class", "vis-outline");
  var barWidth = Math.round(0.3 * iconWidth);
  var originalWidth = group.options.barChart.width;
  var scale = originalWidth / barWidth;
  var bar1Height = Math.round(0.4 * iconHeight);
  var bar2Height = Math.round(0.75 * iconHeight);
  var offset = Math.round((iconWidth - 2 * barWidth) / 3);
  DOMutil.drawBar(x + 0.5 * barWidth + offset, y + fillHeight - bar1Height - 1, barWidth, bar1Height, group.className + ' vis-bar', framework.svgElements, framework.svg, group.style);
  DOMutil.drawBar(x + 1.5 * barWidth + offset + 2, y + fillHeight - bar2Height - 1, barWidth, bar2Height, group.className + ' vis-bar', framework.svgElements, framework.svg, group.style);

  if (group.options.drawPoints.enabled == true) {
    var groupTemplate = {
      style: group.options.drawPoints.style,
      styles: group.options.drawPoints.styles,
      size: group.options.drawPoints.size / scale,
      className: group.className
    };
    DOMutil.drawPoint(x + 0.5 * barWidth + offset, y + fillHeight - bar1Height - 1, groupTemplate, framework.svgElements, framework.svg);
    DOMutil.drawPoint(x + 1.5 * barWidth + offset + 2, y + fillHeight - bar2Height - 1, groupTemplate, framework.svgElements, framework.svg);
  }
};
/**
 * draw a bar graph
 *
 * @param {Array.<vis.GraphGroup.id>} groupIds
 * @param {Object} processedGroupData
 * @param {{svg: Object, svgElements: Array.<Object>, options: Object, groups: Array.<vis.Group>}} framework
 */


Bargraph.draw = function (groupIds, processedGroupData, framework) {
  var combinedData = [];
  var intersections = {};
  var coreDistance;
  var key, drawData;
  var group;
  var i, j;
  var barPoints = 0; // combine all barchart data

  for (i = 0; i < groupIds.length; i++) {
    group = framework.groups[groupIds[i]];

    if (group.options.style === 'bar') {
      if (group.visible === true && (framework.options.groups.visibility[groupIds[i]] === undefined || framework.options.groups.visibility[groupIds[i]] === true)) {
        for (j = 0; j < processedGroupData[groupIds[i]].length; j++) {
          combinedData.push({
            screen_x: processedGroupData[groupIds[i]][j].screen_x,
            screen_end: processedGroupData[groupIds[i]][j].screen_end,
            screen_y: processedGroupData[groupIds[i]][j].screen_y,
            x: processedGroupData[groupIds[i]][j].x,
            end: processedGroupData[groupIds[i]][j].end,
            y: processedGroupData[groupIds[i]][j].y,
            groupId: groupIds[i],
            label: processedGroupData[groupIds[i]][j].label
          });
          barPoints += 1;
        }
      }
    }
  }

  if (barPoints === 0) {
    return;
  } // sort by time and by group


  combinedData.sort(function (a, b) {
    if (a.screen_x === b.screen_x) {
      return a.groupId < b.groupId ? -1 : 1;
    } else {
      return a.screen_x - b.screen_x;
    }
  }); // get intersections

  Bargraph._getDataIntersections(intersections, combinedData); // plot barchart


  for (i = 0; i < combinedData.length; i++) {
    group = framework.groups[combinedData[i].groupId];
    var minWidth = group.options.barChart.minWidth != undefined ? group.options.barChart.minWidth : 0.1 * group.options.barChart.width;
    key = combinedData[i].screen_x;
    var heightOffset = 0;

    if (intersections[key] === undefined) {
      if (i + 1 < combinedData.length) {
        coreDistance = Math.abs(combinedData[i + 1].screen_x - key);
      }

      drawData = Bargraph._getSafeDrawData(coreDistance, group, minWidth);
    } else {
      var nextKey = i + (intersections[key].amount - intersections[key].resolved);

      if (nextKey < combinedData.length) {
        coreDistance = Math.abs(combinedData[nextKey].screen_x - key);
      }

      drawData = Bargraph._getSafeDrawData(coreDistance, group, minWidth);
      intersections[key].resolved += 1;

      if (group.options.stack === true && group.options.excludeFromStacking !== true) {
        if (combinedData[i].screen_y < group.zeroPosition) {
          heightOffset = intersections[key].accumulatedNegative;
          intersections[key].accumulatedNegative += group.zeroPosition - combinedData[i].screen_y;
        } else {
          heightOffset = intersections[key].accumulatedPositive;
          intersections[key].accumulatedPositive += group.zeroPosition - combinedData[i].screen_y;
        }
      } else if (group.options.barChart.sideBySide === true) {
        drawData.width = drawData.width / intersections[key].amount;
        drawData.offset += intersections[key].resolved * drawData.width - 0.5 * drawData.width * (intersections[key].amount + 1);
      }
    }

    var dataWidth = drawData.width;
    var start = combinedData[i].screen_x; // are we drawing explicit boxes? (we supplied an end value)

    if (combinedData[i].screen_end != undefined) {
      dataWidth = combinedData[i].screen_end - combinedData[i].screen_x;
      start += dataWidth * 0.5;
    } else {
      start += drawData.offset;
    }

    DOMutil.drawBar(start, combinedData[i].screen_y - heightOffset, dataWidth, group.zeroPosition - combinedData[i].screen_y, group.className + ' vis-bar', framework.svgElements, framework.svg, group.style); // draw points

    if (group.options.drawPoints.enabled === true) {
      var pointData = {
        screen_x: combinedData[i].screen_x,
        screen_y: combinedData[i].screen_y - heightOffset,
        x: combinedData[i].x,
        y: combinedData[i].y,
        groupId: combinedData[i].groupId,
        label: combinedData[i].label
      };
      points.draw([pointData], group, framework, drawData.offset); //DOMutil.drawPoint(combinedData[i].x + drawData.offset, combinedData[i].y, group, framework.svgElements, framework.svg);
    }
  }
};
/**
 * Fill the intersections object with counters of how many datapoints share the same x coordinates
 * @param {Object} intersections
 * @param {Array.<Object>} combinedData
 * @private
 */


Bargraph._getDataIntersections = function (intersections, combinedData) {
  // get intersections
  var coreDistance;

  for (var i = 0; i < combinedData.length; i++) {
    if (i + 1 < combinedData.length) {
      coreDistance = Math.abs(combinedData[i + 1].screen_x - combinedData[i].screen_x);
    }

    if (i > 0) {
      coreDistance = Math.min(coreDistance, Math.abs(combinedData[i - 1].screen_x - combinedData[i].screen_x));
    }

    if (coreDistance === 0) {
      if (intersections[combinedData[i].screen_x] === undefined) {
        intersections[combinedData[i].screen_x] = {
          amount: 0,
          resolved: 0,
          accumulatedPositive: 0,
          accumulatedNegative: 0
        };
      }

      intersections[combinedData[i].screen_x].amount += 1;
    }
  }
};
/**
 * Get the width and offset for bargraphs based on the coredistance between datapoints
 *
 * @param {number} coreDistance
 * @param {vis.Group} group
 * @param {number} minWidth
 * @returns {{width: number, offset: number}}
 * @private
 */


Bargraph._getSafeDrawData = function (coreDistance, group, minWidth) {
  var width, offset;

  if (coreDistance < group.options.barChart.width && coreDistance > 0) {
    width = coreDistance < minWidth ? minWidth : coreDistance;
    offset = 0; // recalculate offset with the new width;

    if (group.options.barChart.align === 'left') {
      offset -= 0.5 * coreDistance;
    } else if (group.options.barChart.align === 'right') {
      offset += 0.5 * coreDistance;
    }
  } else {
    // default settings
    width = group.options.barChart.width;
    offset = 0;

    if (group.options.barChart.align === 'left') {
      offset -= 0.5 * group.options.barChart.width;
    } else if (group.options.barChart.align === 'right') {
      offset += 0.5 * group.options.barChart.width;
    }
  }

  return {
    width: width,
    offset: offset
  };
};

Bargraph.getStackedYRange = function (combinedData, groupRanges, groupIds, groupLabel, orientation) {
  if (combinedData.length > 0) {
    // sort by time and by group
    combinedData.sort(function (a, b) {
      if (a.screen_x === b.screen_x) {
        return a.groupId < b.groupId ? -1 : 1;
      } else {
        return a.screen_x - b.screen_x;
      }
    });
    var intersections = {};

    Bargraph._getDataIntersections(intersections, combinedData);

    groupRanges[groupLabel] = Bargraph._getStackedYRange(intersections, combinedData);
    groupRanges[groupLabel].yAxisOrientation = orientation;
    groupIds.push(groupLabel);
  }
};

Bargraph._getStackedYRange = function (intersections, combinedData) {
  var key;
  var yMin = combinedData[0].screen_y;
  var yMax = combinedData[0].screen_y;

  for (var i = 0; i < combinedData.length; i++) {
    key = combinedData[i].screen_x;

    if (intersections[key] === undefined) {
      yMin = yMin > combinedData[i].screen_y ? combinedData[i].screen_y : yMin;
      yMax = yMax < combinedData[i].screen_y ? combinedData[i].screen_y : yMax;
    } else {
      if (combinedData[i].screen_y < 0) {
        intersections[key].accumulatedNegative += combinedData[i].screen_y;
      } else {
        intersections[key].accumulatedPositive += combinedData[i].screen_y;
      }
    }
  }

  for (var xpos in intersections) {
    if (intersections.hasOwnProperty(xpos)) {
      yMin = yMin > intersections[xpos].accumulatedNegative ? intersections[xpos].accumulatedNegative : yMin;
      yMin = yMin > intersections[xpos].accumulatedPositive ? intersections[xpos].accumulatedPositive : yMin;
      yMax = yMax < intersections[xpos].accumulatedNegative ? intersections[xpos].accumulatedNegative : yMax;
      yMax = yMax < intersections[xpos].accumulatedPositive ? intersections[xpos].accumulatedPositive : yMax;
    }
  }

  return {
    min: yMin,
    max: yMax
  };
};

var bar = Bargraph;

/**
 *
 * @param {vis.GraphGroup.id} groupId
 * @param {Object} options   // TODO: Describe options
 * @constructor Line
 */

function Line(groupId, options) {// eslint-disable-line no-unused-vars
}

Line.calcPath = function (dataset, group) {
  if (dataset != null) {
    if (dataset.length > 0) {
      var d = []; // construct path from dataset

      if (group.options.interpolation.enabled == true) {
        d = Line._catmullRom(dataset, group);
      } else {
        d = Line._linear(dataset);
      }

      return d;
    }
  }
};

Line.drawIcon = function (group, x, y, iconWidth, iconHeight, framework) {
  var fillHeight = iconHeight * 0.5;
  var path, fillPath;
  var outline = DOMutil.getSVGElement("rect", framework.svgElements, framework.svg);
  outline.setAttributeNS(null, "x", x);
  outline.setAttributeNS(null, "y", y - fillHeight);
  outline.setAttributeNS(null, "width", iconWidth);
  outline.setAttributeNS(null, "height", 2 * fillHeight);
  outline.setAttributeNS(null, "class", "vis-outline");
  path = DOMutil.getSVGElement("path", framework.svgElements, framework.svg);
  path.setAttributeNS(null, "class", group.className);

  if (group.style !== undefined) {
    path.setAttributeNS(null, "style", group.style);
  }

  path.setAttributeNS(null, "d", "M" + x + "," + y + " L" + (x + iconWidth) + "," + y + "");

  if (group.options.shaded.enabled == true) {
    fillPath = DOMutil.getSVGElement("path", framework.svgElements, framework.svg);

    if (group.options.shaded.orientation == 'top') {
      fillPath.setAttributeNS(null, "d", "M" + x + ", " + (y - fillHeight) + "L" + x + "," + y + " L" + (x + iconWidth) + "," + y + " L" + (x + iconWidth) + "," + (y - fillHeight));
    } else {
      fillPath.setAttributeNS(null, "d", "M" + x + "," + y + " " + "L" + x + "," + (y + fillHeight) + " " + "L" + (x + iconWidth) + "," + (y + fillHeight) + "L" + (x + iconWidth) + "," + y);
    }

    fillPath.setAttributeNS(null, "class", group.className + " vis-icon-fill");

    if (group.options.shaded.style !== undefined && group.options.shaded.style !== "") {
      fillPath.setAttributeNS(null, "style", group.options.shaded.style);
    }
  }

  if (group.options.drawPoints.enabled == true) {
    var groupTemplate = {
      style: group.options.drawPoints.style,
      styles: group.options.drawPoints.styles,
      size: group.options.drawPoints.size,
      className: group.className
    };
    DOMutil.drawPoint(x + 0.5 * iconWidth, y, groupTemplate, framework.svgElements, framework.svg);
  }
};

Line.drawShading = function (pathArray, group, subPathArray, framework) {
  // append shading to the path
  if (group.options.shaded.enabled == true) {
    var svgHeight = Number(framework.svg.style.height.replace('px', ''));
    var fillPath = DOMutil.getSVGElement('path', framework.svgElements, framework.svg);
    var type = "L";

    if (group.options.interpolation.enabled == true) {
      type = "C";
    }

    var dFill;
    var zero = 0;

    if (group.options.shaded.orientation == 'top') {
      zero = 0;
    } else if (group.options.shaded.orientation == 'bottom') {
      zero = svgHeight;
    } else {
      zero = Math.min(Math.max(0, group.zeroPosition), svgHeight);
    }

    if (group.options.shaded.orientation == 'group' && subPathArray != null && subPathArray != undefined) {
      dFill = 'M' + pathArray[0][0] + "," + pathArray[0][1] + " " + this.serializePath(pathArray, type, false) + ' L' + subPathArray[subPathArray.length - 1][0] + "," + subPathArray[subPathArray.length - 1][1] + " " + this.serializePath(subPathArray, type, true) + subPathArray[0][0] + "," + subPathArray[0][1] + " Z";
    } else {
      dFill = 'M' + pathArray[0][0] + "," + pathArray[0][1] + " " + this.serializePath(pathArray, type, false) + ' V' + zero + ' H' + pathArray[0][0] + " Z";
    }

    fillPath.setAttributeNS(null, 'class', group.className + ' vis-fill');

    if (group.options.shaded.style !== undefined) {
      fillPath.setAttributeNS(null, 'style', group.options.shaded.style);
    }

    fillPath.setAttributeNS(null, 'd', dFill);
  }
};
/**
 * draw a line graph
 *
 * @param {Array.<Object>} pathArray
 * @param {vis.Group} group
 * @param {{svg: Object, svgElements: Array.<Object>, options: Object, groups: Array.<vis.Group>}} framework
 */


Line.draw = function (pathArray, group, framework) {
  if (pathArray != null && pathArray != undefined) {
    var path = DOMutil.getSVGElement('path', framework.svgElements, framework.svg);
    path.setAttributeNS(null, "class", group.className);

    if (group.style !== undefined) {
      path.setAttributeNS(null, "style", group.style);
    }

    var type = "L";

    if (group.options.interpolation.enabled == true) {
      type = "C";
    } // copy properties to path for drawing.


    path.setAttributeNS(null, 'd', 'M' + pathArray[0][0] + "," + pathArray[0][1] + " " + this.serializePath(pathArray, type, false));
  }
};

Line.serializePath = function (pathArray, type, inverse) {
  if (pathArray.length < 2) {
    //Too little data to create a path.
    return "";
  }

  var d = type;
  var i;

  if (inverse) {
    for (i = pathArray.length - 2; i > 0; i--) {
      d += pathArray[i][0] + "," + pathArray[i][1] + " ";
    }
  } else {
    for (i = 1; i < pathArray.length; i++) {
      d += pathArray[i][0] + "," + pathArray[i][1] + " ";
    }
  }

  return d;
};
/**
 * This uses an uniform parametrization of the interpolation algorithm:
 * 'On the Parameterization of Catmull-Rom Curves' by Cem Yuksel et al.
 * @param {Array.<Object>} data
 * @returns {string}
 * @private
 */


Line._catmullRomUniform = function (data) {
  // catmull rom
  var p0, p1, p2, p3, bp1, bp2;
  var d = [];
  d.push([Math.round(data[0].screen_x), Math.round(data[0].screen_y)]);
  var normalization = 1 / 6;
  var length = data.length;

  for (var i = 0; i < length - 1; i++) {
    p0 = i == 0 ? data[0] : data[i - 1];
    p1 = data[i];
    p2 = data[i + 1];
    p3 = i + 2 < length ? data[i + 2] : p2; // Catmull-Rom to Cubic Bezier conversion matrix
    //    0       1       0       0
    //  -1/6      1      1/6      0
    //    0      1/6      1     -1/6
    //    0       0       1       0
    //    bp0 = { x: p1.x,                               y: p1.y };

    bp1 = {
      screen_x: (-p0.screen_x + 6 * p1.screen_x + p2.screen_x) * normalization,
      screen_y: (-p0.screen_y + 6 * p1.screen_y + p2.screen_y) * normalization
    };
    bp2 = {
      screen_x: (p1.screen_x + 6 * p2.screen_x - p3.screen_x) * normalization,
      screen_y: (p1.screen_y + 6 * p2.screen_y - p3.screen_y) * normalization
    }; //    bp0 = { x: p2.x,                               y: p2.y };

    d.push([bp1.screen_x, bp1.screen_y]);
    d.push([bp2.screen_x, bp2.screen_y]);
    d.push([p2.screen_x, p2.screen_y]);
  }

  return d;
};
/**
 * This uses either the chordal or centripetal parameterization of the catmull-rom algorithm.
 * By default, the centripetal parameterization is used because this gives the nicest results.
 * These parameterizations are relatively heavy because the distance between 4 points have to be calculated.
 *
 * One optimization can be used to reuse distances since this is a sliding window approach.
 * @param {Array.<Object>} data
 * @param {vis.GraphGroup} group
 * @returns {string}
 * @private
 */


Line._catmullRom = function (data, group) {
  var alpha = group.options.interpolation.alpha;

  if (alpha == 0 || alpha === undefined) {
    return this._catmullRomUniform(data);
  } else {
    var p0, p1, p2, p3, bp1, bp2, d1, d2, d3, A, B, N, M;
    var d3powA, d2powA, d3pow2A, d2pow2A, d1pow2A, d1powA;
    var d = [];
    d.push([Math.round(data[0].screen_x), Math.round(data[0].screen_y)]);
    var length = data.length;

    for (var i = 0; i < length - 1; i++) {
      p0 = i == 0 ? data[0] : data[i - 1];
      p1 = data[i];
      p2 = data[i + 1];
      p3 = i + 2 < length ? data[i + 2] : p2;
      d1 = Math.sqrt(Math.pow(p0.screen_x - p1.screen_x, 2) + Math.pow(p0.screen_y - p1.screen_y, 2));
      d2 = Math.sqrt(Math.pow(p1.screen_x - p2.screen_x, 2) + Math.pow(p1.screen_y - p2.screen_y, 2));
      d3 = Math.sqrt(Math.pow(p2.screen_x - p3.screen_x, 2) + Math.pow(p2.screen_y - p3.screen_y, 2)); // Catmull-Rom to Cubic Bezier conversion matrix
      // A = 2d1^2a + 3d1^a * d2^a + d3^2a
      // B = 2d3^2a + 3d3^a * d2^a + d2^2a
      // [   0             1            0          0          ]
      // [   -d2^2a /N     A/N          d1^2a /N   0          ]
      // [   0             d3^2a /M     B/M        -d2^2a /M  ]
      // [   0             0            1          0          ]

      d3powA = Math.pow(d3, alpha);
      d3pow2A = Math.pow(d3, 2 * alpha);
      d2powA = Math.pow(d2, alpha);
      d2pow2A = Math.pow(d2, 2 * alpha);
      d1powA = Math.pow(d1, alpha);
      d1pow2A = Math.pow(d1, 2 * alpha);
      A = 2 * d1pow2A + 3 * d1powA * d2powA + d2pow2A;
      B = 2 * d3pow2A + 3 * d3powA * d2powA + d2pow2A;
      N = 3 * d1powA * (d1powA + d2powA);

      if (N > 0) {
        N = 1 / N;
      }

      M = 3 * d3powA * (d3powA + d2powA);

      if (M > 0) {
        M = 1 / M;
      }

      bp1 = {
        screen_x: (-d2pow2A * p0.screen_x + A * p1.screen_x + d1pow2A * p2.screen_x) * N,
        screen_y: (-d2pow2A * p0.screen_y + A * p1.screen_y + d1pow2A * p2.screen_y) * N
      };
      bp2 = {
        screen_x: (d3pow2A * p1.screen_x + B * p2.screen_x - d2pow2A * p3.screen_x) * M,
        screen_y: (d3pow2A * p1.screen_y + B * p2.screen_y - d2pow2A * p3.screen_y) * M
      };

      if (bp1.screen_x == 0 && bp1.screen_y == 0) {
        bp1 = p1;
      }

      if (bp2.screen_x == 0 && bp2.screen_y == 0) {
        bp2 = p2;
      }

      d.push([bp1.screen_x, bp1.screen_y]);
      d.push([bp2.screen_x, bp2.screen_y]);
      d.push([p2.screen_x, p2.screen_y]);
    }

    return d;
  }
};
/**
 * this generates the SVG path for a linear drawing between datapoints.
 * @param {Array.<Object>} data
 * @returns {string}
 * @private
 */


Line._linear = function (data) {
  // linear
  var d = [];

  for (var i = 0; i < data.length; i++) {
    d.push([data[i].screen_x, data[i].screen_y]);
  }

  return d;
};

var line = Line;

/**
 * /**
 * @param {object} group            | the object of the group from the dataset
 * @param {string} groupId          | ID of the group
 * @param {object} options          | the default options
 * @param {array} groupsUsingDefaultStyles  | this array has one entree.
 *                                            It is passed as an array so it is passed by reference.
 *                                            It enumerates through the default styles
 * @constructor GraphGroup
 */

function GraphGroup(group, groupId, options, groupsUsingDefaultStyles) {
  this.id = groupId;
  var fields = ['sampling', 'style', 'sort', 'yAxisOrientation', 'barChart', 'drawPoints', 'shaded', 'interpolation', 'zIndex', 'excludeFromStacking', 'excludeFromLegend'];
  this.options = util.selectiveBridgeObject(fields, options);
  this.usingDefaultStyle = group.className === undefined;
  this.groupsUsingDefaultStyles = groupsUsingDefaultStyles;
  this.zeroPosition = 0;
  this.update(group);

  if (this.usingDefaultStyle == true) {
    this.groupsUsingDefaultStyles[0] += 1;
  }

  this.itemsData = [];
  this.visible = group.visible === undefined ? true : group.visible;
}
/**
 * this loads a reference to all items in this group into this group.
 * @param {array} items
 */


GraphGroup.prototype.setItems = function (items) {
  if (items != null) {
    this.itemsData = items;

    if (this.options.sort == true) {
      util.insertSort(this.itemsData, function (a, b) {
        return a.x > b.x ? 1 : -1;
      });
    }
  } else {
    this.itemsData = [];
  }
};

GraphGroup.prototype.getItems = function () {
  return this.itemsData;
};
/**
 * this is used for barcharts and shading, this way, we only have to calculate it once.
 * @param {number} pos
 */


GraphGroup.prototype.setZeroPosition = function (pos) {
  this.zeroPosition = pos;
};
/**
 * set the options of the graph group over the default options.
 * @param {Object} options
 */


GraphGroup.prototype.setOptions = function (options) {
  if (options !== undefined) {
    var fields = ['sampling', 'style', 'sort', 'yAxisOrientation', 'barChart', 'zIndex', 'excludeFromStacking', 'excludeFromLegend'];
    util.selectiveDeepExtend(fields, this.options, options); // if the group's drawPoints is a function delegate the callback to the onRender property

    if (typeof options.drawPoints == 'function') {
      options.drawPoints = {
        onRender: options.drawPoints
      };
    }

    util.mergeOptions(this.options, options, 'interpolation');
    util.mergeOptions(this.options, options, 'drawPoints');
    util.mergeOptions(this.options, options, 'shaded');

    if (options.interpolation) {
      if (_typeof$1(options.interpolation) == 'object') {
        if (options.interpolation.parametrization) {
          if (options.interpolation.parametrization == 'uniform') {
            this.options.interpolation.alpha = 0;
          } else if (options.interpolation.parametrization == 'chordal') {
            this.options.interpolation.alpha = 1.0;
          } else {
            this.options.interpolation.parametrization = 'centripetal';
            this.options.interpolation.alpha = 0.5;
          }
        }
      }
    }
  }
};
/**
 * this updates the current group class with the latest group dataset entree, used in _updateGroup in linegraph
 * @param {vis.Group} group
 */


GraphGroup.prototype.update = function (group) {
  this.group = group;
  this.content = group.content || 'graph';
  this.className = group.className || this.className || 'vis-graph-group' + this.groupsUsingDefaultStyles[0] % 10;
  this.visible = group.visible === undefined ? true : group.visible;
  this.style = group.style;
  this.setOptions(group.options);
};
/**
 * return the legend entree for this group.
 *
 * @param {number} iconWidth
 * @param {number} iconHeight
 * @param {{svg: (*|Element), svgElements: Object, options: Object, groups: Array.<Object>}} framework
 * @param {number} x
 * @param {number} y
 * @returns {{icon: (*|Element), label: (*|string), orientation: *}}
 */


GraphGroup.prototype.getLegend = function (iconWidth, iconHeight, framework, x, y) {
  if (framework == undefined || framework == null) {
    var svg = document.createElementNS('http://www.w3.org/2000/svg', "svg");
    framework = {
      svg: svg,
      svgElements: {},
      options: this.options,
      groups: [this]
    };
  }

  if (x == undefined || x == null) {
    x = 0;
  }

  if (y == undefined || y == null) {
    y = 0.5 * iconHeight;
  }

  switch (this.options.style) {
    case "line":
      line.drawIcon(this, x, y, iconWidth, iconHeight, framework);
      break;

    case "points": //explicit no break

    case "point":
      points.drawIcon(this, x, y, iconWidth, iconHeight, framework);
      break;

    case "bar":
      bar.drawIcon(this, x, y, iconWidth, iconHeight, framework);
      break;
  }

  return {
    icon: framework.svg,
    label: this.content,
    orientation: this.options.yAxisOrientation
  };
};

GraphGroup.prototype.getYRange = function (groupData) {
  var yMin = groupData[0].y;
  var yMax = groupData[0].y;

  for (var j = 0; j < groupData.length; j++) {
    yMin = yMin > groupData[j].y ? groupData[j].y : yMin;
    yMax = yMax < groupData[j].y ? groupData[j].y : yMax;
  }

  return {
    min: yMin,
    max: yMax,
    yAxisOrientation: this.options.yAxisOrientation
  };
};

var GraphGroup_1 = GraphGroup;

/**
 * Legend for Graph2d
 *
 * @param {vis.Graph2d.body} body
 * @param {vis.Graph2d.options} options
 * @param {number} side
 * @param {vis.LineGraph.options} linegraphOptions
 * @constructor Legend
 * @extends Component
 */

function Legend(body, options, side, linegraphOptions) {
  this.body = body;
  this.defaultOptions = {
    enabled: false,
    icons: true,
    iconSize: 20,
    iconSpacing: 6,
    left: {
      visible: true,
      position: 'top-left' // top/bottom - left,center,right

    },
    right: {
      visible: true,
      position: 'top-right' // top/bottom - left,center,right

    }
  };
  this.side = side;
  this.options = util.extend({}, this.defaultOptions);
  this.linegraphOptions = linegraphOptions;
  this.svgElements = {};
  this.dom = {};
  this.groups = {};
  this.amountOfGroups = 0;

  this._create();

  this.framework = {
    svg: this.svg,
    svgElements: this.svgElements,
    options: this.options,
    groups: this.groups
  };
  this.setOptions(options);
}

Legend.prototype = new Component_1();

Legend.prototype.clear = function () {
  this.groups = {};
  this.amountOfGroups = 0;
};

Legend.prototype.addGroup = function (label, graphOptions) {
  // Include a group only if the group option 'excludeFromLegend: false' is not set.
  if (graphOptions.options.excludeFromLegend != true) {
    if (!this.groups.hasOwnProperty(label)) {
      this.groups[label] = graphOptions;
    }

    this.amountOfGroups += 1;
  }
};

Legend.prototype.updateGroup = function (label, graphOptions) {
  this.groups[label] = graphOptions;
};

Legend.prototype.removeGroup = function (label) {
  if (this.groups.hasOwnProperty(label)) {
    delete this.groups[label];
    this.amountOfGroups -= 1;
  }
};

Legend.prototype._create = function () {
  this.dom.frame = document.createElement('div');
  this.dom.frame.className = 'vis-legend';
  this.dom.frame.style.position = "absolute";
  this.dom.frame.style.top = "10px";
  this.dom.frame.style.display = "block";
  this.dom.textArea = document.createElement('div');
  this.dom.textArea.className = 'vis-legend-text';
  this.dom.textArea.style.position = "relative";
  this.dom.textArea.style.top = "0px";
  this.svg = document.createElementNS('http://www.w3.org/2000/svg', "svg");
  this.svg.style.position = 'absolute';
  this.svg.style.top = 0 + 'px';
  this.svg.style.width = this.options.iconSize + 5 + 'px';
  this.svg.style.height = '100%';
  this.dom.frame.appendChild(this.svg);
  this.dom.frame.appendChild(this.dom.textArea);
};
/**
 * Hide the component from the DOM
 */


Legend.prototype.hide = function () {
  // remove the frame containing the items
  if (this.dom.frame.parentNode) {
    this.dom.frame.parentNode.removeChild(this.dom.frame);
  }
};
/**
 * Show the component in the DOM (when not already visible).
 */


Legend.prototype.show = function () {
  // show frame containing the items
  if (!this.dom.frame.parentNode) {
    this.body.dom.center.appendChild(this.dom.frame);
  }
};

Legend.prototype.setOptions = function (options) {
  var fields = ['enabled', 'orientation', 'icons', 'left', 'right'];
  util.selectiveDeepExtend(fields, this.options, options);
};

Legend.prototype.redraw = function () {
  var activeGroups = 0;
  var groupArray = Object.keys(this.groups);
  groupArray.sort(function (a, b) {
    return a < b ? -1 : 1;
  });

  for (var i = 0; i < groupArray.length; i++) {
    var groupId = groupArray[i];

    if (this.groups[groupId].visible == true && (this.linegraphOptions.visibility[groupId] === undefined || this.linegraphOptions.visibility[groupId] == true)) {
      activeGroups++;
    }
  }

  if (this.options[this.side].visible == false || this.amountOfGroups == 0 || this.options.enabled == false || activeGroups == 0) {
    this.hide();
  } else {
    this.show();

    if (this.options[this.side].position == 'top-left' || this.options[this.side].position == 'bottom-left') {
      this.dom.frame.style.left = '4px';
      this.dom.frame.style.textAlign = "left";
      this.dom.textArea.style.textAlign = "left";
      this.dom.textArea.style.left = this.options.iconSize + 15 + 'px';
      this.dom.textArea.style.right = '';
      this.svg.style.left = 0 + 'px';
      this.svg.style.right = '';
    } else {
      this.dom.frame.style.right = '4px';
      this.dom.frame.style.textAlign = "right";
      this.dom.textArea.style.textAlign = "right";
      this.dom.textArea.style.right = this.options.iconSize + 15 + 'px';
      this.dom.textArea.style.left = '';
      this.svg.style.right = 0 + 'px';
      this.svg.style.left = '';
    }

    if (this.options[this.side].position == 'top-left' || this.options[this.side].position == 'top-right') {
      this.dom.frame.style.top = 4 - Number(this.body.dom.center.style.top.replace("px", "")) + 'px';
      this.dom.frame.style.bottom = '';
    } else {
      var scrollableHeight = this.body.domProps.center.height - this.body.domProps.centerContainer.height;
      this.dom.frame.style.bottom = 4 + scrollableHeight + Number(this.body.dom.center.style.top.replace("px", "")) + 'px';
      this.dom.frame.style.top = '';
    }

    if (this.options.icons == false) {
      this.dom.frame.style.width = this.dom.textArea.offsetWidth + 10 + 'px';
      this.dom.textArea.style.right = '';
      this.dom.textArea.style.left = '';
      this.svg.style.width = '0px';
    } else {
      this.dom.frame.style.width = this.options.iconSize + 15 + this.dom.textArea.offsetWidth + 10 + 'px';
      this.drawLegendIcons();
    }

    var content = '';

    for (i = 0; i < groupArray.length; i++) {
      groupId = groupArray[i];

      if (this.groups[groupId].visible == true && (this.linegraphOptions.visibility[groupId] === undefined || this.linegraphOptions.visibility[groupId] == true)) {
        content += this.groups[groupId].content + '<br />';
      }
    }

    this.dom.textArea.innerHTML = content;
    this.dom.textArea.style.lineHeight = 0.75 * this.options.iconSize + this.options.iconSpacing + 'px';
  }
};

Legend.prototype.drawLegendIcons = function () {
  if (this.dom.frame.parentNode) {
    var groupArray = Object.keys(this.groups);
    groupArray.sort(function (a, b) {
      return a < b ? -1 : 1;
    }); // this resets the elements so the order is maintained

    DOMutil.resetElements(this.svgElements);
    var padding = window.getComputedStyle(this.dom.frame).paddingTop;
    var iconOffset = Number(padding.replace('px', ''));
    var x = iconOffset;
    var iconWidth = this.options.iconSize;
    var iconHeight = 0.75 * this.options.iconSize;
    var y = iconOffset + 0.5 * iconHeight + 3;
    this.svg.style.width = iconWidth + 5 + iconOffset + 'px';

    for (var i = 0; i < groupArray.length; i++) {
      var groupId = groupArray[i];

      if (this.groups[groupId].visible == true && (this.linegraphOptions.visibility[groupId] === undefined || this.linegraphOptions.visibility[groupId] == true)) {
        this.groups[groupId].getLegend(iconWidth, iconHeight, this.framework, x, y);
        y += iconHeight + this.options.iconSpacing;
      }
    }
  }
};

var Legend_1 = Legend;

var DataSet$2 = index.DataSet;
var DataView$2 = index.DataView;
var UNGROUPED$1 = '__ungrouped__'; // reserved group id for ungrouped items

/**
 * This is the constructor of the LineGraph. It requires a Timeline body and options.
 *
 * @param {vis.Timeline.body} body
 * @param {Object} options
 * @constructor LineGraph
 * @extends Component
 */

function LineGraph(body, options) {
  this.id = util.randomUUID();
  this.body = body;
  this.defaultOptions = {
    yAxisOrientation: 'left',
    defaultGroup: 'default',
    sort: true,
    sampling: true,
    stack: false,
    graphHeight: '400px',
    shaded: {
      enabled: false,
      orientation: 'bottom' // top, bottom, zero

    },
    style: 'line',
    // line, bar
    barChart: {
      width: 50,
      sideBySide: false,
      align: 'center' // left, center, right

    },
    interpolation: {
      enabled: true,
      parametrization: 'centripetal',
      // uniform (alpha = 0.0), chordal (alpha = 1.0), centripetal (alpha = 0.5)
      alpha: 0.5
    },
    drawPoints: {
      enabled: true,
      size: 6,
      style: 'square' // square, circle

    },
    dataAxis: {},
    //Defaults are done on DataAxis level
    legend: {},
    //Defaults are done on Legend level
    groups: {
      visibility: {}
    }
  }; // options is shared by this lineGraph and all its items

  this.options = util.extend({}, this.defaultOptions);
  this.dom = {};
  this.props = {};
  this.hammer = null;
  this.groups = {};
  this.abortedGraphUpdate = false;
  this.updateSVGheight = false;
  this.updateSVGheightOnResize = false;
  this.forceGraphUpdate = true;
  var me = this;
  this.itemsData = null; // DataSet

  this.groupsData = null; // DataSet
  // listeners for the DataSet of the items

  this.itemListeners = {
    'add': function add(event, params, senderId) {
      // eslint-disable-line no-unused-vars
      me._onAdd(params.items);
    },
    'update': function update(event, params, senderId) {
      // eslint-disable-line no-unused-vars
      me._onUpdate(params.items);
    },
    'remove': function remove(event, params, senderId) {
      // eslint-disable-line no-unused-vars
      me._onRemove(params.items);
    }
  }; // listeners for the DataSet of the groups

  this.groupListeners = {
    'add': function add(event, params, senderId) {
      // eslint-disable-line no-unused-vars
      me._onAddGroups(params.items);
    },
    'update': function update(event, params, senderId) {
      // eslint-disable-line no-unused-vars
      me._onUpdateGroups(params.items);
    },
    'remove': function remove(event, params, senderId) {
      // eslint-disable-line no-unused-vars
      me._onRemoveGroups(params.items);
    }
  };
  this.items = {}; // object with an Item for every data item

  this.selection = []; // list with the ids of all selected nodes

  this.lastStart = this.body.range.start;
  this.touchParams = {}; // stores properties while dragging

  this.svgElements = {};
  this.setOptions(options);
  this.groupsUsingDefaultStyles = [0];
  this.body.emitter.on('rangechanged', function () {
    me.lastStart = me.body.range.start;
    me.svg.style.left = util.option.asSize(-me.props.width);
    me.forceGraphUpdate = true; //Is this local redraw necessary? (Core also does a change event!)

    me.redraw.call(me);
  }); // create the HTML DOM

  this._create();

  this.framework = {
    svg: this.svg,
    svgElements: this.svgElements,
    options: this.options,
    groups: this.groups
  };
}

LineGraph.prototype = new Component_1();
/**
 * Create the HTML DOM for the ItemSet
 */

LineGraph.prototype._create = function () {
  var frame = document.createElement('div');
  frame.className = 'vis-line-graph';
  this.dom.frame = frame; // create svg element for graph drawing.

  this.svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
  this.svg.style.position = 'relative';
  this.svg.style.height = ('' + this.options.graphHeight).replace('px', '') + 'px';
  this.svg.style.display = 'block';
  frame.appendChild(this.svg); // data axis

  this.options.dataAxis.orientation = 'left';
  this.yAxisLeft = new DataAxis(this.body, this.options.dataAxis, this.svg, this.options.groups);
  this.options.dataAxis.orientation = 'right';
  this.yAxisRight = new DataAxis(this.body, this.options.dataAxis, this.svg, this.options.groups);
  delete this.options.dataAxis.orientation; // legends

  this.legendLeft = new Legend_1(this.body, this.options.legend, 'left', this.options.groups);
  this.legendRight = new Legend_1(this.body, this.options.legend, 'right', this.options.groups);
  this.show();
};
/**
 * set the options of the LineGraph. the mergeOptions is used for subObjects that have an enabled element.
 * @param {object} options
 */


LineGraph.prototype.setOptions = function (options) {
  if (options) {
    var fields = ['sampling', 'defaultGroup', 'stack', 'height', 'graphHeight', 'yAxisOrientation', 'style', 'barChart', 'dataAxis', 'sort', 'groups'];

    if (options.graphHeight === undefined && options.height !== undefined) {
      this.updateSVGheight = true;
      this.updateSVGheightOnResize = true;
    } else if (this.body.domProps.centerContainer.height !== undefined && options.graphHeight !== undefined) {
      if (parseInt((options.graphHeight + '').replace("px", '')) < this.body.domProps.centerContainer.height) {
        this.updateSVGheight = true;
      }
    }

    util.selectiveDeepExtend(fields, this.options, options);
    util.mergeOptions(this.options, options, 'interpolation');
    util.mergeOptions(this.options, options, 'drawPoints');
    util.mergeOptions(this.options, options, 'shaded');
    util.mergeOptions(this.options, options, 'legend');

    if (options.interpolation) {
      if (_typeof$1(options.interpolation) == 'object') {
        if (options.interpolation.parametrization) {
          if (options.interpolation.parametrization == 'uniform') {
            this.options.interpolation.alpha = 0;
          } else if (options.interpolation.parametrization == 'chordal') {
            this.options.interpolation.alpha = 1.0;
          } else {
            this.options.interpolation.parametrization = 'centripetal';
            this.options.interpolation.alpha = 0.5;
          }
        }
      }
    }

    if (this.yAxisLeft) {
      if (options.dataAxis !== undefined) {
        this.yAxisLeft.setOptions(this.options.dataAxis);
        this.yAxisRight.setOptions(this.options.dataAxis);
      }
    }

    if (this.legendLeft) {
      if (options.legend !== undefined) {
        this.legendLeft.setOptions(this.options.legend);
        this.legendRight.setOptions(this.options.legend);
      }
    }

    if (this.groups.hasOwnProperty(UNGROUPED$1)) {
      this.groups[UNGROUPED$1].setOptions(options);
    }
  } // this is used to redraw the graph if the visibility of the groups is changed.


  if (this.dom.frame) {
    //not on initial run?
    this.forceGraphUpdate = true;
    this.body.emitter.emit("_change", {
      queue: true
    });
  }
};
/**
 * Hide the component from the DOM
 */


LineGraph.prototype.hide = function () {
  // remove the frame containing the items
  if (this.dom.frame.parentNode) {
    this.dom.frame.parentNode.removeChild(this.dom.frame);
  }
};
/**
 * Show the component in the DOM (when not already visible).
 */


LineGraph.prototype.show = function () {
  // show frame containing the items
  if (!this.dom.frame.parentNode) {
    this.body.dom.center.appendChild(this.dom.frame);
  }
};
/**
 * Set items
 * @param {vis.DataSet | null} items
 */


LineGraph.prototype.setItems = function (items) {
  var me = this,
      ids,
      oldItemsData = this.itemsData; // replace the dataset

  if (!items) {
    this.itemsData = null;
  } else if (items instanceof DataSet$2 || items instanceof DataView$2) {
    this.itemsData = items;
  } else {
    throw new TypeError('Data must be an instance of DataSet or DataView');
  }

  if (oldItemsData) {
    // unsubscribe from old dataset
    util.forEach(this.itemListeners, function (callback, event) {
      oldItemsData.off(event, callback);
    }); // remove all drawn items

    ids = oldItemsData.getIds();

    this._onRemove(ids);
  }

  if (this.itemsData) {
    // subscribe to new dataset
    var id = this.id;
    util.forEach(this.itemListeners, function (callback, event) {
      me.itemsData.on(event, callback, id);
    }); // add all new items

    ids = this.itemsData.getIds();

    this._onAdd(ids);
  }
};
/**
 * Set groups
 * @param {vis.DataSet} groups
 */


LineGraph.prototype.setGroups = function (groups) {
  var me = this;
  var ids; // unsubscribe from current dataset

  if (this.groupsData) {
    util.forEach(this.groupListeners, function (callback, event) {
      me.groupsData.off(event, callback);
    }); // remove all drawn groups

    ids = this.groupsData.getIds();
    this.groupsData = null;

    for (var i = 0; i < ids.length; i++) {
      this._removeGroup(ids[i]);
    }
  } // replace the dataset


  if (!groups) {
    this.groupsData = null;
  } else if (groups instanceof DataSet$2 || groups instanceof DataView$2) {
    this.groupsData = groups;
  } else {
    throw new TypeError('Data must be an instance of DataSet or DataView');
  }

  if (this.groupsData) {
    // subscribe to new dataset
    var id = this.id;
    util.forEach(this.groupListeners, function (callback, event) {
      me.groupsData.on(event, callback, id);
    }); // draw all ms

    ids = this.groupsData.getIds();

    this._onAddGroups(ids);
  }
};

LineGraph.prototype._onUpdate = function (ids) {
  this._updateAllGroupData(ids);
};

LineGraph.prototype._onAdd = function (ids) {
  this._onUpdate(ids);
};

LineGraph.prototype._onRemove = function (ids) {
  this._onUpdate(ids);
};

LineGraph.prototype._onUpdateGroups = function (groupIds) {
  this._updateAllGroupData(null, groupIds);
};

LineGraph.prototype._onAddGroups = function (groupIds) {
  this._onUpdateGroups(groupIds);
};
/**
 * this cleans the group out off the legends and the dataaxis, updates the ungrouped and updates the graph
 * @param {Array} groupIds
 * @private
 */


LineGraph.prototype._onRemoveGroups = function (groupIds) {
  for (var i = 0; i < groupIds.length; i++) {
    this._removeGroup(groupIds[i]);
  }

  this.forceGraphUpdate = true;
  this.body.emitter.emit("_change", {
    queue: true
  });
};
/**
 * this cleans the group out off the legends and the dataaxis
 * @param {vis.GraphGroup.id} groupId
 * @private
 */


LineGraph.prototype._removeGroup = function (groupId) {
  if (this.groups.hasOwnProperty(groupId)) {
    if (this.groups[groupId].options.yAxisOrientation == 'right') {
      this.yAxisRight.removeGroup(groupId);
      this.legendRight.removeGroup(groupId);
      this.legendRight.redraw();
    } else {
      this.yAxisLeft.removeGroup(groupId);
      this.legendLeft.removeGroup(groupId);
      this.legendLeft.redraw();
    }

    delete this.groups[groupId];
  }
};
/**
 * update a group object with the group dataset entree
 *
 * @param {vis.GraphGroup} group
 * @param {vis.GraphGroup.id} groupId
 * @private
 */


LineGraph.prototype._updateGroup = function (group, groupId) {
  if (!this.groups.hasOwnProperty(groupId)) {
    this.groups[groupId] = new GraphGroup_1(group, groupId, this.options, this.groupsUsingDefaultStyles);

    if (this.groups[groupId].options.yAxisOrientation == 'right') {
      this.yAxisRight.addGroup(groupId, this.groups[groupId]);
      this.legendRight.addGroup(groupId, this.groups[groupId]);
    } else {
      this.yAxisLeft.addGroup(groupId, this.groups[groupId]);
      this.legendLeft.addGroup(groupId, this.groups[groupId]);
    }
  } else {
    this.groups[groupId].update(group);

    if (this.groups[groupId].options.yAxisOrientation == 'right') {
      this.yAxisRight.updateGroup(groupId, this.groups[groupId]);
      this.legendRight.updateGroup(groupId, this.groups[groupId]); //If yAxisOrientation changed, clean out the group from the other axis.

      this.yAxisLeft.removeGroup(groupId);
      this.legendLeft.removeGroup(groupId);
    } else {
      this.yAxisLeft.updateGroup(groupId, this.groups[groupId]);
      this.legendLeft.updateGroup(groupId, this.groups[groupId]); //If yAxisOrientation changed, clean out the group from the other axis.

      this.yAxisRight.removeGroup(groupId);
      this.legendRight.removeGroup(groupId);
    }
  }

  this.legendLeft.redraw();
  this.legendRight.redraw();
};
/**
 * this updates all groups, it is used when there is an update the the itemset.
 *
 * @param  {Array} ids
 * @param  {Array} groupIds
 * @private
 */


LineGraph.prototype._updateAllGroupData = function (ids, groupIds) {
  if (this.itemsData != null) {
    var groupsContent = {};
    var items = this.itemsData.get();
    var fieldId = this.itemsData._fieldId;
    var idMap = {};

    if (ids) {
      ids.map(function (id) {
        idMap[id] = id;
      });
    } //pre-Determine array sizes, for more efficient memory claim


    var groupCounts = {};

    for (var i = 0; i < items.length; i++) {
      var item = items[i];
      var groupId = item.group;

      if (groupId === null || groupId === undefined) {
        groupId = UNGROUPED$1;
      }

      groupCounts.hasOwnProperty(groupId) ? groupCounts[groupId]++ : groupCounts[groupId] = 1;
    } //Pre-load arrays from existing groups if items are not changed (not in ids)


    var existingItemsMap = {};

    if (!groupIds && ids) {
      for (groupId in this.groups) {
        if (this.groups.hasOwnProperty(groupId)) {
          group = this.groups[groupId];
          var existing_items = group.getItems();
          groupsContent[groupId] = existing_items.filter(function (item) {
            existingItemsMap[item[fieldId]] = item[fieldId];
            return item[fieldId] !== idMap[item[fieldId]];
          });
          var newLength = groupCounts[groupId];
          groupCounts[groupId] -= groupsContent[groupId].length;

          if (groupsContent[groupId].length < newLength) {
            groupsContent[groupId][newLength - 1] = {};
          }
        }
      }
    } //Now insert data into the arrays.


    for (i = 0; i < items.length; i++) {
      item = items[i];
      groupId = item.group;

      if (groupId === null || groupId === undefined) {
        groupId = UNGROUPED$1;
      }

      if (!groupIds && ids && item[fieldId] !== idMap[item[fieldId]] && existingItemsMap.hasOwnProperty(item[fieldId])) {
        continue;
      }

      if (!groupsContent.hasOwnProperty(groupId)) {
        groupsContent[groupId] = new Array(groupCounts[groupId]);
      } //Copy data (because of unmodifiable DataView input.


      var extended = util.bridgeObject(item);
      extended.x = util.convert(item.x, 'Date');
      extended.end = util.convert(item.end, 'Date');
      extended.orginalY = item.y; //real Y

      extended.y = Number(item.y);
      extended[fieldId] = item[fieldId];
      var index = groupsContent[groupId].length - groupCounts[groupId]--;
      groupsContent[groupId][index] = extended;
    } //Make sure all groups are present, to allow removal of old groups


    for (groupId in this.groups) {
      if (this.groups.hasOwnProperty(groupId)) {
        if (!groupsContent.hasOwnProperty(groupId)) {
          groupsContent[groupId] = new Array(0);
        }
      }
    } //Update legendas, style and axis


    for (groupId in groupsContent) {
      if (groupsContent.hasOwnProperty(groupId)) {
        if (groupsContent[groupId].length == 0) {
          if (this.groups.hasOwnProperty(groupId)) {
            this._removeGroup(groupId);
          }
        } else {
          var group = undefined;

          if (this.groupsData != undefined) {
            group = this.groupsData.get(groupId);
          }

          if (group == undefined) {
            group = {
              id: groupId,
              content: this.options.defaultGroup + groupId
            };
          }

          this._updateGroup(group, groupId);

          this.groups[groupId].setItems(groupsContent[groupId]);
        }
      }
    }

    this.forceGraphUpdate = true;
    this.body.emitter.emit("_change", {
      queue: true
    });
  }
};
/**
 * Redraw the component, mandatory function
 * @return {boolean} Returns true if the component is resized
 */


LineGraph.prototype.redraw = function () {
  var resized = false; // calculate actual size and position

  this.props.width = this.dom.frame.offsetWidth;
  this.props.height = this.body.domProps.centerContainer.height - this.body.domProps.border.top - this.body.domProps.border.bottom; // check if this component is resized

  resized = this._isResized() || resized; // check whether zoomed (in that case we need to re-stack everything)

  var visibleInterval = this.body.range.end - this.body.range.start;
  var zoomed = visibleInterval != this.lastVisibleInterval;
  this.lastVisibleInterval = visibleInterval; // the svg element is three times as big as the width, this allows for fully dragging left and right
  // without reloading the graph. the controls for this are bound to events in the constructor

  if (resized == true) {
    this.svg.style.width = util.option.asSize(3 * this.props.width);
    this.svg.style.left = util.option.asSize(-this.props.width); // if the height of the graph is set as proportional, change the height of the svg

    if ((this.options.height + '').indexOf("%") != -1 || this.updateSVGheightOnResize == true) {
      this.updateSVGheight = true;
    }
  } // update the height of the graph on each redraw of the graph.


  if (this.updateSVGheight == true) {
    if (this.options.graphHeight != this.props.height + 'px') {
      this.options.graphHeight = this.props.height + 'px';
      this.svg.style.height = this.props.height + 'px';
    }

    this.updateSVGheight = false;
  } else {
    this.svg.style.height = ('' + this.options.graphHeight).replace('px', '') + 'px';
  } // zoomed is here to ensure that animations are shown correctly.


  if (resized == true || zoomed == true || this.abortedGraphUpdate == true || this.forceGraphUpdate == true) {
    resized = this._updateGraph() || resized;
    this.forceGraphUpdate = false;
  } else {
    // move the whole svg while dragging
    if (this.lastStart != 0) {
      var offset = this.body.range.start - this.lastStart;
      var range = this.body.range.end - this.body.range.start;

      if (this.props.width != 0) {
        var rangePerPixelInv = this.props.width / range;
        var xOffset = offset * rangePerPixelInv;
        this.svg.style.left = -this.props.width - xOffset + 'px';
      }
    }
  }

  this.legendLeft.redraw();
  this.legendRight.redraw();
  return resized;
};

LineGraph.prototype._getSortedGroupIds = function () {
  // getting group Ids
  var grouplist = [];

  for (var groupId in this.groups) {
    if (this.groups.hasOwnProperty(groupId)) {
      var group = this.groups[groupId];

      if (group.visible == true && (this.options.groups.visibility[groupId] === undefined || this.options.groups.visibility[groupId] == true)) {
        grouplist.push({
          id: groupId,
          zIndex: group.options.zIndex
        });
      }
    }
  }

  util.insertSort(grouplist, function (a, b) {
    var az = a.zIndex;
    var bz = b.zIndex;
    if (az === undefined) az = 0;
    if (bz === undefined) bz = 0;
    return az == bz ? 0 : az < bz ? -1 : 1;
  });
  var groupIds = new Array(grouplist.length);

  for (var i = 0; i < grouplist.length; i++) {
    groupIds[i] = grouplist[i].id;
  }

  return groupIds;
};
/**
 * Update and redraw the graph.
 *
 * @returns {boolean}
 * @private
 */


LineGraph.prototype._updateGraph = function () {
  // reset the svg elements
  DOMutil.prepareElements(this.svgElements);

  if (this.props.width != 0 && this.itemsData != null) {
    var group, i;
    var groupRanges = {};
    var changeCalled = false; // this is the range of the SVG canvas

    var minDate = this.body.util.toGlobalTime(-this.body.domProps.root.width);
    var maxDate = this.body.util.toGlobalTime(2 * this.body.domProps.root.width); // getting group Ids

    var groupIds = this._getSortedGroupIds();

    if (groupIds.length > 0) {
      var groupsData = {}; // fill groups data, this only loads the data we require based on the timewindow

      this._getRelevantData(groupIds, groupsData, minDate, maxDate); // apply sampling, if disabled, it will pass through this function.


      this._applySampling(groupIds, groupsData); // we transform the X coordinates to detect collisions


      for (i = 0; i < groupIds.length; i++) {
        this._convertXcoordinates(groupsData[groupIds[i]]);
      } // now all needed data has been collected we start the processing.


      this._getYRanges(groupIds, groupsData, groupRanges); // update the Y axis first, we use this data to draw at the correct Y points


      changeCalled = this._updateYAxis(groupIds, groupRanges); //  at changeCalled, abort this update cycle as the graph needs another update with new Width input from the Redraw container.
      //  Cleanup SVG elements on abort.

      if (changeCalled == true) {
        DOMutil.cleanupElements(this.svgElements);
        this.abortedGraphUpdate = true;
        return true;
      }

      this.abortedGraphUpdate = false; // With the yAxis scaled correctly, use this to get the Y values of the points.

      var below = undefined;

      for (i = 0; i < groupIds.length; i++) {
        group = this.groups[groupIds[i]];

        if (this.options.stack === true && this.options.style === 'line') {
          if (group.options.excludeFromStacking == undefined || !group.options.excludeFromStacking) {
            if (below != undefined) {
              this._stack(groupsData[group.id], groupsData[below.id]);

              if (group.options.shaded.enabled == true && group.options.shaded.orientation !== "group") {
                if (group.options.shaded.orientation == "top" && below.options.shaded.orientation !== "group") {
                  below.options.shaded.orientation = "group";
                  below.options.shaded.groupId = group.id;
                } else {
                  group.options.shaded.orientation = "group";
                  group.options.shaded.groupId = below.id;
                }
              }
            }

            below = group;
          }
        }

        this._convertYcoordinates(groupsData[groupIds[i]], group);
      } //Precalculate paths and draw shading if appropriate. This will make sure the shading is always behind any lines.


      var paths = {};

      for (i = 0; i < groupIds.length; i++) {
        group = this.groups[groupIds[i]];

        if (group.options.style === 'line' && group.options.shaded.enabled == true) {
          var dataset = groupsData[groupIds[i]];

          if (dataset == null || dataset.length == 0) {
            continue;
          }

          if (!paths.hasOwnProperty(groupIds[i])) {
            paths[groupIds[i]] = line.calcPath(dataset, group);
          }

          if (group.options.shaded.orientation === "group") {
            var subGroupId = group.options.shaded.groupId;

            if (groupIds.indexOf(subGroupId) === -1) {
              console.log(group.id + ": Unknown shading group target given:" + subGroupId);
              continue;
            }

            if (!paths.hasOwnProperty(subGroupId)) {
              paths[subGroupId] = line.calcPath(groupsData[subGroupId], this.groups[subGroupId]);
            }

            line.drawShading(paths[groupIds[i]], group, paths[subGroupId], this.framework);
          } else {
            line.drawShading(paths[groupIds[i]], group, undefined, this.framework);
          }
        }
      } // draw the groups, calculating paths if still necessary.


      bar.draw(groupIds, groupsData, this.framework);

      for (i = 0; i < groupIds.length; i++) {
        group = this.groups[groupIds[i]];

        if (groupsData[groupIds[i]].length > 0) {
          switch (group.options.style) {
            case "line":
              if (!paths.hasOwnProperty(groupIds[i])) {
                paths[groupIds[i]] = line.calcPath(groupsData[groupIds[i]], group);
              }

              line.draw(paths[groupIds[i]], group, this.framework);
            // eslint-disable-line no-fallthrough

            case "point": // eslint-disable-line no-fallthrough

            case "points":
              if (group.options.style == "point" || group.options.style == "points" || group.options.drawPoints.enabled == true) {
                points.draw(groupsData[groupIds[i]], group, this.framework);
              }

              break;

            case "bar": // bar needs to be drawn enmasse
            // eslint-disable-line no-fallthrough

            default: //do nothing...

          }
        }
      }
    }
  } // cleanup unused svg elements


  DOMutil.cleanupElements(this.svgElements);
  return false;
};

LineGraph.prototype._stack = function (data, subData) {
  var index, dx, dy, subPrevPoint, subNextPoint;
  index = 0; // for each data point we look for a matching on in the set below

  for (var j = 0; j < data.length; j++) {
    subPrevPoint = undefined;
    subNextPoint = undefined; // we look for time matches or a before-after point

    for (var k = index; k < subData.length; k++) {
      // if times match exactly
      if (subData[k].x === data[j].x) {
        subPrevPoint = subData[k];
        subNextPoint = subData[k];
        index = k;
        break;
      } else if (subData[k].x > data[j].x) {
        // overshoot
        subNextPoint = subData[k];

        if (k == 0) {
          subPrevPoint = subNextPoint;
        } else {
          subPrevPoint = subData[k - 1];
        }

        index = k;
        break;
      }
    } // in case the last data point has been used, we assume it stays like this.


    if (subNextPoint === undefined) {
      subPrevPoint = subData[subData.length - 1];
      subNextPoint = subData[subData.length - 1];
    } // linear interpolation


    dx = subNextPoint.x - subPrevPoint.x;
    dy = subNextPoint.y - subPrevPoint.y;

    if (dx == 0) {
      data[j].y = data[j].orginalY + subNextPoint.y;
    } else {
      data[j].y = data[j].orginalY + dy / dx * (data[j].x - subPrevPoint.x) + subPrevPoint.y; // ax + b where b is data[j].y
    }
  }
};
/**
 * first select and preprocess the data from the datasets.
 * the groups have their preselection of data, we now loop over this data to see
 * what data we need to draw. Sorted data is much faster.
 * more optimization is possible by doing the sampling before and using the binary search
 * to find the end date to determine the increment.
 *
 * @param {array}  groupIds
 * @param {object} groupsData
 * @param {date}   minDate
 * @param {date}   maxDate
 * @private
 */


LineGraph.prototype._getRelevantData = function (groupIds, groupsData, minDate, maxDate) {
  var group, i, j, item;

  if (groupIds.length > 0) {
    for (i = 0; i < groupIds.length; i++) {
      group = this.groups[groupIds[i]];
      var itemsData = group.getItems(); // optimization for sorted data

      if (group.options.sort == true) {
        var dateComparator = function dateComparator(a, b) {
          return a.getTime() == b.getTime() ? 0 : a < b ? -1 : 1;
        };

        var first = Math.max(0, util.binarySearchValue(itemsData, minDate, 'x', 'before', dateComparator));
        var last = Math.min(itemsData.length, util.binarySearchValue(itemsData, maxDate, 'x', 'after', dateComparator) + 1);

        if (last <= 0) {
          last = itemsData.length;
        }

        var dataContainer = new Array(last - first);

        for (j = first; j < last; j++) {
          item = group.itemsData[j];
          dataContainer[j - first] = item;
        }

        groupsData[groupIds[i]] = dataContainer;
      } else {
        // If unsorted data, all data is relevant, just returning entire structure
        groupsData[groupIds[i]] = group.itemsData;
      }
    }
  }
};
/**
 *
 * @param {Array.<vis.GraphGroup.id>} groupIds
 * @param {vis.DataSet} groupsData
 * @private
 */


LineGraph.prototype._applySampling = function (groupIds, groupsData) {
  var group;

  if (groupIds.length > 0) {
    for (var i = 0; i < groupIds.length; i++) {
      group = this.groups[groupIds[i]];

      if (group.options.sampling == true) {
        var dataContainer = groupsData[groupIds[i]];

        if (dataContainer.length > 0) {
          var increment = 1;
          var amountOfPoints = dataContainer.length; // the global screen is used because changing the width of the yAxis may affect the increment, resulting in an endless loop
          // of width changing of the yAxis.
          //TODO: This assumes sorted data, but that's not guaranteed!

          var xDistance = this.body.util.toGlobalScreen(dataContainer[dataContainer.length - 1].x) - this.body.util.toGlobalScreen(dataContainer[0].x);
          var pointsPerPixel = amountOfPoints / xDistance;
          increment = Math.min(Math.ceil(0.2 * amountOfPoints), Math.max(1, Math.round(pointsPerPixel)));
          var sampledData = new Array(amountOfPoints);

          for (var j = 0; j < amountOfPoints; j += increment) {
            var idx = Math.round(j / increment);
            sampledData[idx] = dataContainer[j];
          }

          groupsData[groupIds[i]] = sampledData.splice(0, Math.round(amountOfPoints / increment));
        }
      }
    }
  }
};
/**
 *
 * @param {Array.<vis.GraphGroup.id>} groupIds
 * @param {vis.DataSet} groupsData
 * @param {object} groupRanges  | this is being filled here
 * @private
 */


LineGraph.prototype._getYRanges = function (groupIds, groupsData, groupRanges) {
  var groupData, group, i;
  var combinedDataLeft = [];
  var combinedDataRight = [];
  var options;

  if (groupIds.length > 0) {
    for (i = 0; i < groupIds.length; i++) {
      groupData = groupsData[groupIds[i]];
      options = this.groups[groupIds[i]].options;

      if (groupData.length > 0) {
        group = this.groups[groupIds[i]]; // if bar graphs are stacked, their range need to be handled differently and accumulated over all groups.

        if (options.stack === true && options.style === 'bar') {
          if (options.yAxisOrientation === 'left') {
            combinedDataLeft = combinedDataLeft.concat(groupData);
          } else {
            combinedDataRight = combinedDataRight.concat(groupData);
          }
        } else {
          groupRanges[groupIds[i]] = group.getYRange(groupData, groupIds[i]);
        }
      }
    } // if bar graphs are stacked, their range need to be handled differently and accumulated over all groups.


    bar.getStackedYRange(combinedDataLeft, groupRanges, groupIds, '__barStackLeft', 'left');
    bar.getStackedYRange(combinedDataRight, groupRanges, groupIds, '__barStackRight', 'right');
  }
};
/**
 * this sets the Y ranges for the Y axis. It also determines which of the axis should be shown or hidden.
 * @param {Array.<vis.GraphGroup.id>} groupIds
 * @param {Object} groupRanges
 * @returns {boolean} resized
 * @private
 */


LineGraph.prototype._updateYAxis = function (groupIds, groupRanges) {
  var resized = false;
  var yAxisLeftUsed = false;
  var yAxisRightUsed = false;
  var minLeft = 1e9,
      minRight = 1e9,
      maxLeft = -1e9,
      maxRight = -1e9,
      minVal,
      maxVal; // if groups are present

  if (groupIds.length > 0) {
    // this is here to make sure that if there are no items in the axis but there are groups, that there is no infinite draw/redraw loop.
    for (var i = 0; i < groupIds.length; i++) {
      var group = this.groups[groupIds[i]];

      if (group && group.options.yAxisOrientation != 'right') {
        yAxisLeftUsed = true;
        minLeft = 1e9;
        maxLeft = -1e9;
      } else if (group && group.options.yAxisOrientation) {
        yAxisRightUsed = true;
        minRight = 1e9;
        maxRight = -1e9;
      }
    } // if there are items:


    for (i = 0; i < groupIds.length; i++) {
      if (groupRanges.hasOwnProperty(groupIds[i])) {
        if (groupRanges[groupIds[i]].ignore !== true) {
          minVal = groupRanges[groupIds[i]].min;
          maxVal = groupRanges[groupIds[i]].max;

          if (groupRanges[groupIds[i]].yAxisOrientation != 'right') {
            yAxisLeftUsed = true;
            minLeft = minLeft > minVal ? minVal : minLeft;
            maxLeft = maxLeft < maxVal ? maxVal : maxLeft;
          } else {
            yAxisRightUsed = true;
            minRight = minRight > minVal ? minVal : minRight;
            maxRight = maxRight < maxVal ? maxVal : maxRight;
          }
        }
      }
    }

    if (yAxisLeftUsed == true) {
      this.yAxisLeft.setRange(minLeft, maxLeft);
    }

    if (yAxisRightUsed == true) {
      this.yAxisRight.setRange(minRight, maxRight);
    }
  }

  resized = this._toggleAxisVisiblity(yAxisLeftUsed, this.yAxisLeft) || resized;
  resized = this._toggleAxisVisiblity(yAxisRightUsed, this.yAxisRight) || resized;

  if (yAxisRightUsed == true && yAxisLeftUsed == true) {
    this.yAxisLeft.drawIcons = true;
    this.yAxisRight.drawIcons = true;
  } else {
    this.yAxisLeft.drawIcons = false;
    this.yAxisRight.drawIcons = false;
  }

  this.yAxisRight.master = !yAxisLeftUsed;
  this.yAxisRight.masterAxis = this.yAxisLeft;

  if (this.yAxisRight.master == false) {
    if (yAxisRightUsed == true) {
      this.yAxisLeft.lineOffset = this.yAxisRight.width;
    } else {
      this.yAxisLeft.lineOffset = 0;
    }

    resized = this.yAxisLeft.redraw() || resized;
    resized = this.yAxisRight.redraw() || resized;
  } else {
    resized = this.yAxisRight.redraw() || resized;
  } // clean the accumulated lists


  var tempGroups = ['__barStackLeft', '__barStackRight', '__lineStackLeft', '__lineStackRight'];

  for (i = 0; i < tempGroups.length; i++) {
    if (groupIds.indexOf(tempGroups[i]) != -1) {
      groupIds.splice(groupIds.indexOf(tempGroups[i]), 1);
    }
  }

  return resized;
};
/**
 * This shows or hides the Y axis if needed. If there is a change, the changed event is emitted by the updateYAxis function
 *
 * @param {boolean} axisUsed
 * @param {vis.DataAxis}  axis
 * @returns {boolean}
 * @private
 */


LineGraph.prototype._toggleAxisVisiblity = function (axisUsed, axis) {
  var changed = false;

  if (axisUsed == false) {
    if (axis.dom.frame.parentNode && axis.hidden == false) {
      axis.hide();
      changed = true;
    }
  } else {
    if (!axis.dom.frame.parentNode && axis.hidden == true) {
      axis.show();
      changed = true;
    }
  }

  return changed;
};
/**
 * This uses the DataAxis object to generate the correct X coordinate on the SVG window. It uses the
 * util function toScreen to get the x coordinate from the timestamp. It also pre-filters the data and get the minMax ranges for
 * the yAxis.
 *
 * @param {Array.<Object>} datapoints
 * @private
 */


LineGraph.prototype._convertXcoordinates = function (datapoints) {
  var toScreen = this.body.util.toScreen;

  for (var i = 0; i < datapoints.length; i++) {
    datapoints[i].screen_x = toScreen(datapoints[i].x) + this.props.width;
    datapoints[i].screen_y = datapoints[i].y; //starting point for range calculations

    if (datapoints[i].end != undefined) {
      datapoints[i].screen_end = toScreen(datapoints[i].end) + this.props.width;
    } else {
      datapoints[i].screen_end = undefined;
    }
  }
};
/**
 * This uses the DataAxis object to generate the correct X coordinate on the SVG window. It uses the
 * util function toScreen to get the x coordinate from the timestamp. It also pre-filters the data and get the minMax ranges for
 * the yAxis.
 *
 * @param {Array.<Object>} datapoints
 * @param {vis.GraphGroup} group
 * @private
 */


LineGraph.prototype._convertYcoordinates = function (datapoints, group) {
  var axis = this.yAxisLeft;
  var svgHeight = Number(this.svg.style.height.replace('px', ''));

  if (group.options.yAxisOrientation == 'right') {
    axis = this.yAxisRight;
  }

  for (var i = 0; i < datapoints.length; i++) {
    datapoints[i].screen_y = Math.round(axis.convertValue(datapoints[i].y));
  }

  group.setZeroPosition(Math.min(svgHeight, axis.convertValue(0)));
};

var LineGraph_1 = LineGraph;

/**
 * This object contains all possible options. It will check if the types are correct, if required if the option is one
 * of the allowed values.
 *
 * __any__ means that the name of the property does not matter.
 * __type__ is a required field for all objects and contains the allowed types of all objects
 */
var string$1 = 'string';
var bool$1 = 'boolean';
var number$1 = 'number';
var array$1 = 'array';
var date$1 = 'date';
var object$1 = 'object'; // should only be in a __type__ property

var dom$1 = 'dom';
var moment$5 = 'moment';
var any$1 = 'any';
var allOptions$3 = {
  configure: {
    enabled: {
      'boolean': bool$1
    },
    filter: {
      'boolean': bool$1,
      'function': 'function'
    },
    container: {
      dom: dom$1
    },
    __type__: {
      object: object$1,
      'boolean': bool$1,
      'function': 'function'
    }
  },
  //globals :
  alignCurrentTime: {
    string: string$1,
    'undefined': 'undefined'
  },
  yAxisOrientation: {
    string: ['left', 'right']
  },
  defaultGroup: {
    string: string$1
  },
  sort: {
    'boolean': bool$1
  },
  sampling: {
    'boolean': bool$1
  },
  stack: {
    'boolean': bool$1
  },
  graphHeight: {
    string: string$1,
    number: number$1
  },
  shaded: {
    enabled: {
      'boolean': bool$1
    },
    orientation: {
      string: ['bottom', 'top', 'zero', 'group']
    },
    // top, bottom, zero, group
    groupId: {
      object: object$1
    },
    __type__: {
      'boolean': bool$1,
      object: object$1
    }
  },
  style: {
    string: ['line', 'bar', 'points']
  },
  // line, bar
  barChart: {
    width: {
      number: number$1
    },
    minWidth: {
      number: number$1
    },
    sideBySide: {
      'boolean': bool$1
    },
    align: {
      string: ['left', 'center', 'right']
    },
    __type__: {
      object: object$1
    }
  },
  interpolation: {
    enabled: {
      'boolean': bool$1
    },
    parametrization: {
      string: ['centripetal', 'chordal', 'uniform']
    },
    // uniform (alpha = 0.0), chordal (alpha = 1.0), centripetal (alpha = 0.5)
    alpha: {
      number: number$1
    },
    __type__: {
      object: object$1,
      'boolean': bool$1
    }
  },
  drawPoints: {
    enabled: {
      'boolean': bool$1
    },
    onRender: {
      'function': 'function'
    },
    size: {
      number: number$1
    },
    style: {
      string: ['square', 'circle']
    },
    // square, circle
    __type__: {
      object: object$1,
      'boolean': bool$1,
      'function': 'function'
    }
  },
  dataAxis: {
    showMinorLabels: {
      'boolean': bool$1
    },
    showMajorLabels: {
      'boolean': bool$1
    },
    icons: {
      'boolean': bool$1
    },
    width: {
      string: string$1,
      number: number$1
    },
    visible: {
      'boolean': bool$1
    },
    alignZeros: {
      'boolean': bool$1
    },
    left: {
      range: {
        min: {
          number: number$1,
          'undefined': 'undefined'
        },
        max: {
          number: number$1,
          'undefined': 'undefined'
        },
        __type__: {
          object: object$1
        }
      },
      format: {
        'function': 'function'
      },
      title: {
        text: {
          string: string$1,
          number: number$1,
          'undefined': 'undefined'
        },
        style: {
          string: string$1,
          'undefined': 'undefined'
        },
        __type__: {
          object: object$1
        }
      },
      __type__: {
        object: object$1
      }
    },
    right: {
      range: {
        min: {
          number: number$1,
          'undefined': 'undefined'
        },
        max: {
          number: number$1,
          'undefined': 'undefined'
        },
        __type__: {
          object: object$1
        }
      },
      format: {
        'function': 'function'
      },
      title: {
        text: {
          string: string$1,
          number: number$1,
          'undefined': 'undefined'
        },
        style: {
          string: string$1,
          'undefined': 'undefined'
        },
        __type__: {
          object: object$1
        }
      },
      __type__: {
        object: object$1
      }
    },
    __type__: {
      object: object$1
    }
  },
  legend: {
    enabled: {
      'boolean': bool$1
    },
    icons: {
      'boolean': bool$1
    },
    left: {
      visible: {
        'boolean': bool$1
      },
      position: {
        string: ['top-right', 'bottom-right', 'top-left', 'bottom-left']
      },
      __type__: {
        object: object$1
      }
    },
    right: {
      visible: {
        'boolean': bool$1
      },
      position: {
        string: ['top-right', 'bottom-right', 'top-left', 'bottom-left']
      },
      __type__: {
        object: object$1
      }
    },
    __type__: {
      object: object$1,
      'boolean': bool$1
    }
  },
  groups: {
    visibility: {
      any: any$1
    },
    __type__: {
      object: object$1
    }
  },
  autoResize: {
    'boolean': bool$1
  },
  throttleRedraw: {
    number: number$1
  },
  // TODO: DEPRICATED see https://github.com/almende/vis/issues/2511
  clickToUse: {
    'boolean': bool$1
  },
  end: {
    number: number$1,
    date: date$1,
    string: string$1,
    moment: moment$5
  },
  format: {
    minorLabels: {
      millisecond: {
        string: string$1,
        'undefined': 'undefined'
      },
      second: {
        string: string$1,
        'undefined': 'undefined'
      },
      minute: {
        string: string$1,
        'undefined': 'undefined'
      },
      hour: {
        string: string$1,
        'undefined': 'undefined'
      },
      weekday: {
        string: string$1,
        'undefined': 'undefined'
      },
      day: {
        string: string$1,
        'undefined': 'undefined'
      },
      month: {
        string: string$1,
        'undefined': 'undefined'
      },
      quarter: {
        string: string$1,
        'undefined': 'undefined'
      },
      year: {
        string: string$1,
        'undefined': 'undefined'
      },
      __type__: {
        object: object$1
      }
    },
    majorLabels: {
      millisecond: {
        string: string$1,
        'undefined': 'undefined'
      },
      second: {
        string: string$1,
        'undefined': 'undefined'
      },
      minute: {
        string: string$1,
        'undefined': 'undefined'
      },
      hour: {
        string: string$1,
        'undefined': 'undefined'
      },
      weekday: {
        string: string$1,
        'undefined': 'undefined'
      },
      day: {
        string: string$1,
        'undefined': 'undefined'
      },
      month: {
        string: string$1,
        'undefined': 'undefined'
      },
      quarter: {
        string: string$1,
        'undefined': 'undefined'
      },
      year: {
        string: string$1,
        'undefined': 'undefined'
      },
      __type__: {
        object: object$1
      }
    },
    __type__: {
      object: object$1
    }
  },
  moment: {
    'function': 'function'
  },
  height: {
    string: string$1,
    number: number$1
  },
  hiddenDates: {
    start: {
      date: date$1,
      number: number$1,
      string: string$1,
      moment: moment$5
    },
    end: {
      date: date$1,
      number: number$1,
      string: string$1,
      moment: moment$5
    },
    repeat: {
      string: string$1
    },
    __type__: {
      object: object$1,
      array: array$1
    }
  },
  locale: {
    string: string$1
  },
  locales: {
    __any__: {
      any: any$1
    },
    __type__: {
      object: object$1
    }
  },
  max: {
    date: date$1,
    number: number$1,
    string: string$1,
    moment: moment$5
  },
  maxHeight: {
    number: number$1,
    string: string$1
  },
  maxMinorChars: {
    number: number$1
  },
  min: {
    date: date$1,
    number: number$1,
    string: string$1,
    moment: moment$5
  },
  minHeight: {
    number: number$1,
    string: string$1
  },
  moveable: {
    'boolean': bool$1
  },
  multiselect: {
    'boolean': bool$1
  },
  orientation: {
    string: string$1
  },
  showCurrentTime: {
    'boolean': bool$1
  },
  showMajorLabels: {
    'boolean': bool$1
  },
  showMinorLabels: {
    'boolean': bool$1
  },
  start: {
    date: date$1,
    number: number$1,
    string: string$1,
    moment: moment$5
  },
  timeAxis: {
    scale: {
      string: string$1,
      'undefined': 'undefined'
    },
    step: {
      number: number$1,
      'undefined': 'undefined'
    },
    __type__: {
      object: object$1
    }
  },
  width: {
    string: string$1,
    number: number$1
  },
  zoomable: {
    'boolean': bool$1
  },
  zoomKey: {
    string: ['ctrlKey', 'altKey', 'metaKey', '']
  },
  zoomMax: {
    number: number$1
  },
  zoomMin: {
    number: number$1
  },
  zIndex: {
    number: number$1
  },
  __type__: {
    object: object$1
  }
};
var configureOptions$2 = {
  global: {
    alignCurrentTime: ['none', 'year', 'month', 'quarter', 'week', 'isoWeek', 'day', 'date', 'hour', 'minute', 'second'],
    //yAxisOrientation: ['left','right'], // TDOO: enable as soon as Grahp2d doesn't crash when changing this on the fly
    sort: true,
    sampling: true,
    stack: false,
    shaded: {
      enabled: false,
      orientation: ['zero', 'top', 'bottom', 'group'] // zero, top, bottom

    },
    style: ['line', 'bar', 'points'],
    // line, bar
    barChart: {
      width: [50, 5, 100, 5],
      minWidth: [50, 5, 100, 5],
      sideBySide: false,
      align: ['left', 'center', 'right'] // left, center, right

    },
    interpolation: {
      enabled: true,
      parametrization: ['centripetal', 'chordal', 'uniform'] // uniform (alpha = 0.0), chordal (alpha = 1.0), centripetal (alpha = 0.5)

    },
    drawPoints: {
      enabled: true,
      size: [6, 2, 30, 1],
      style: ['square', 'circle'] // square, circle

    },
    dataAxis: {
      showMinorLabels: true,
      showMajorLabels: true,
      icons: false,
      width: [40, 0, 200, 1],
      visible: true,
      alignZeros: true,
      left: {
        //range: {min:'undefined': 'undefined'ined,max:'undefined': 'undefined'ined},
        //format: function (value) {return value;},
        title: {
          text: '',
          style: ''
        }
      },
      right: {
        //range: {min:'undefined': 'undefined'ined,max:'undefined': 'undefined'ined},
        //format: function (value) {return value;},
        title: {
          text: '',
          style: ''
        }
      }
    },
    legend: {
      enabled: false,
      icons: true,
      left: {
        visible: true,
        position: ['top-right', 'bottom-right', 'top-left', 'bottom-left'] // top/bottom - left,right

      },
      right: {
        visible: true,
        position: ['top-right', 'bottom-right', 'top-left', 'bottom-left'] // top/bottom - left,right

      }
    },
    autoResize: true,
    clickToUse: false,
    end: '',
    format: {
      minorLabels: {
        millisecond: 'SSS',
        second: 's',
        minute: 'HH:mm',
        hour: 'HH:mm',
        weekday: 'ddd D',
        day: 'D',
        month: 'MMM',
        quarter: '[Q]Q',
        year: 'YYYY'
      },
      majorLabels: {
        millisecond: 'HH:mm:ss',
        second: 'D MMMM HH:mm',
        minute: 'ddd D MMMM',
        hour: 'ddd D MMMM',
        weekday: 'MMMM YYYY',
        day: 'MMMM YYYY',
        month: 'YYYY',
        quarter: 'YYYY',
        year: ''
      }
    },
    height: '',
    locale: '',
    max: '',
    maxHeight: '',
    maxMinorChars: [7, 0, 20, 1],
    min: '',
    minHeight: '',
    moveable: true,
    orientation: ['both', 'bottom', 'top'],
    showCurrentTime: false,
    showMajorLabels: true,
    showMinorLabels: true,
    start: '',
    width: '100%',
    zoomable: true,
    zoomKey: ['ctrlKey', 'altKey', 'metaKey', ''],
    zoomMax: [315360000000000, 10, 315360000000000, 1],
    zoomMin: [10, 10, 315360000000000, 1],
    zIndex: 0
  }
};

var optionsGraph2d = /*#__PURE__*/Object.freeze({
  allOptions: allOptions$3,
  configureOptions: configureOptions$2
});

var DataSet$3 = index.DataSet;
var DataView$3 = index.DataView;
var Validator$3 = Validator$1.Validator;
var printStyle$2 = Validator$1.printStyle;
var allOptions$4 = optionsGraph2d.allOptions;
var configureOptions$3 = optionsGraph2d.configureOptions;
var Configurator$2 = Configurator.default;
/**
 * Create a timeline visualization
 * @param {HTMLElement} container
 * @param {vis.DataSet | Array} [items]
 * @param {vis.DataSet | Array | vis.DataView | Object} [groups]
 * @param {Object} [options]  See Graph2d.setOptions for the available options.
 * @constructor Graph2d
 * @extends Core
 */

function Graph2d(container, items, groups, options) {
  // if the third element is options, the forth is groups (optionally);
  if (!(Array.isArray(groups) || groups instanceof DataSet$3 || groups instanceof DataView$3) && groups instanceof Object) {
    var forthArgument = options;
    options = groups;
    groups = forthArgument;
  } // TODO: REMOVE THIS in the next MAJOR release
  // see https://github.com/almende/vis/issues/2511


  if (options && options.throttleRedraw) {
    console.warn("Graph2d option \"throttleRedraw\" is DEPRICATED and no longer supported. It will be removed in the next MAJOR release.");
  }

  var me = this;
  this.defaultOptions = {
    start: null,
    end: null,
    autoResize: true,
    orientation: {
      axis: 'bottom',
      // axis orientation: 'bottom', 'top', or 'both'
      item: 'bottom' // not relevant for Graph2d

    },
    moment: moment$3,
    width: null,
    height: null,
    maxHeight: null,
    minHeight: null
  };
  this.options = util.deepExtend({}, this.defaultOptions); // Create the DOM, props, and emitter

  this._create(container); // all components listed here will be repainted automatically


  this.components = [];
  this.body = {
    dom: this.dom,
    domProps: this.props,
    emitter: {
      on: this.on.bind(this),
      off: this.off.bind(this),
      emit: this.emit.bind(this)
    },
    hiddenDates: [],
    util: {
      toScreen: me._toScreen.bind(me),
      toGlobalScreen: me._toGlobalScreen.bind(me),
      // this refers to the root.width
      toTime: me._toTime.bind(me),
      toGlobalTime: me._toGlobalTime.bind(me)
    }
  }; // range

  this.range = new Range_1(this.body);
  this.components.push(this.range);
  this.body.range = this.range; // time axis

  this.timeAxis = new TimeAxis(this.body);
  this.components.push(this.timeAxis); //this.body.util.snap = this.timeAxis.snap.bind(this.timeAxis);
  // current time bar

  this.currentTime = new CurrentTime_1(this.body);
  this.components.push(this.currentTime); // item set

  this.linegraph = new LineGraph_1(this.body);
  this.components.push(this.linegraph);
  this.itemsData = null; // DataSet

  this.groupsData = null; // DataSet

  this.on('tap', function (event) {
    me.emit('click', me.getEventProperties(event));
  });
  this.on('doubletap', function (event) {
    me.emit('doubleClick', me.getEventProperties(event));
  });

  this.dom.root.oncontextmenu = function (event) {
    me.emit('contextmenu', me.getEventProperties(event));
  }; //Single time autoscale/fit


  this.initialFitDone = false;
  this.on('changed', function () {
    if (me.itemsData == null) return;

    if (!me.initialFitDone && !me.options.rollingMode) {
      me.initialFitDone = true;

      if (me.options.start != undefined || me.options.end != undefined) {
        if (me.options.start == undefined || me.options.end == undefined) {
          var range = me.getItemRange();
        }

        var start = me.options.start != undefined ? me.options.start : range.min;
        var end = me.options.end != undefined ? me.options.end : range.max;
        me.setWindow(start, end, {
          animation: false
        });
      } else {
        me.fit({
          animation: false
        });
      }
    }

    if (!me.initialDrawDone && (me.initialRangeChangeDone || !me.options.start && !me.options.end || me.options.rollingMode)) {
      me.initialDrawDone = true;
      me.itemSet.initialDrawDone = true;
      me.dom.root.style.visibility = 'visible';
      me.dom.loadingScreen.parentNode.removeChild(me.dom.loadingScreen);

      if (me.options.onInitialDrawComplete) {
        setTimeout(function () {
          return me.options.onInitialDrawComplete();
        }, 0);
      }
    }
  }); // apply options

  if (options) {
    this.setOptions(options);
  } // IMPORTANT: THIS HAPPENS BEFORE SET ITEMS!


  if (groups) {
    this.setGroups(groups);
  } // create itemset


  if (items) {
    this.setItems(items);
  } // draw for the first time


  this._redraw();
} // Extend the functionality from Core


Graph2d.prototype = new Core();

Graph2d.prototype.setOptions = function (options) {
  // validate options
  var errorFound = Validator$3.validate(options, allOptions$4);

  if (errorFound === true) {
    console.log('%cErrors have been found in the supplied options object.', printStyle$2);
  }

  Core.prototype.setOptions.call(this, options);
};
/**
 * Set items
 * @param {vis.DataSet | Array | null} items
 */


Graph2d.prototype.setItems = function (items) {
  var initialLoad = this.itemsData == null; // convert to type DataSet when needed

  var newDataSet;

  if (!items) {
    newDataSet = null;
  } else if (items instanceof DataSet$3 || items instanceof DataView$3) {
    newDataSet = items;
  } else {
    // turn an array into a dataset
    newDataSet = new DataSet$3(items, {
      type: {
        start: 'Date',
        end: 'Date'
      }
    });
  } // set items


  this.itemsData = newDataSet;
  this.linegraph && this.linegraph.setItems(newDataSet);

  if (initialLoad) {
    if (this.options.start != undefined || this.options.end != undefined) {
      var start = this.options.start != undefined ? this.options.start : null;
      var end = this.options.end != undefined ? this.options.end : null;
      this.setWindow(start, end, {
        animation: false
      });
    } else {
      this.fit({
        animation: false
      });
    }
  }
};
/**
 * Set groups
 * @param {vis.DataSet | Array} groups
 */


Graph2d.prototype.setGroups = function (groups) {
  // convert to type DataSet when needed
  var newDataSet;

  if (!groups) {
    newDataSet = null;
  } else if (groups instanceof DataSet$3 || groups instanceof DataView$3) {
    newDataSet = groups;
  } else {
    // turn an array into a dataset
    newDataSet = new DataSet$3(groups);
  }

  this.groupsData = newDataSet;
  this.linegraph.setGroups(newDataSet);
};
/**
 * Returns an object containing an SVG element with the icon of the group (size determined by iconWidth and iconHeight), the label of the group (content) and the yAxisOrientation of the group (left or right).
 * @param {vis.GraphGroup.id} groupId
 * @param {number} width
 * @param {number} height
 * @returns {{icon: SVGElement, label: string, orientation: string}|string}
 */


Graph2d.prototype.getLegend = function (groupId, width, height) {
  if (width === undefined) {
    width = 15;
  }

  if (height === undefined) {
    height = 15;
  }

  if (this.linegraph.groups[groupId] !== undefined) {
    return this.linegraph.groups[groupId].getLegend(width, height);
  } else {
    return "cannot find group:'" + groupId + "'";
  }
};
/**
 * This checks if the visible option of the supplied group (by ID) is true or false.
 * @param {vis.GraphGroup.id} groupId
 * @returns {boolean}
 */


Graph2d.prototype.isGroupVisible = function (groupId) {
  if (this.linegraph.groups[groupId] !== undefined) {
    return this.linegraph.groups[groupId].visible && (this.linegraph.options.groups.visibility[groupId] === undefined || this.linegraph.options.groups.visibility[groupId] == true);
  } else {
    return false;
  }
};
/**
 * Get the data range of the item set.
 * @returns {{min: Date, max: Date}} range  A range with a start and end Date.
 *                                          When no minimum is found, min==null
 *                                          When no maximum is found, max==null
 */


Graph2d.prototype.getDataRange = function () {
  var min = null;
  var max = null; // calculate min from start filed

  for (var groupId in this.linegraph.groups) {
    if (this.linegraph.groups.hasOwnProperty(groupId)) {
      if (this.linegraph.groups[groupId].visible == true) {
        for (var i = 0; i < this.linegraph.groups[groupId].itemsData.length; i++) {
          var item = this.linegraph.groups[groupId].itemsData[i];
          var value = util.convert(item.x, 'Date').valueOf();
          min = min == null ? value : min > value ? value : min;
          max = max == null ? value : max < value ? value : max;
        }
      }
    }
  }

  return {
    min: min != null ? new Date(min) : null,
    max: max != null ? new Date(max) : null
  };
};
/**
 * Generate Timeline related information from an event
 * @param {Event} event
 * @return {Object} An object with related information, like on which area
 *                  The event happened, whether clicked on an item, etc.
 */


Graph2d.prototype.getEventProperties = function (event) {
  var clientX = event.center ? event.center.x : event.clientX;
  var clientY = event.center ? event.center.y : event.clientY;
  var x = clientX - util.getAbsoluteLeft(this.dom.centerContainer);
  var y = clientY - util.getAbsoluteTop(this.dom.centerContainer);

  var time = this._toTime(x);

  var customTime = CustomTime.customTimeFromTarget(event);
  var element = util.getTarget(event);
  var what = null;

  if (util.hasParent(element, this.timeAxis.dom.foreground)) {
    what = 'axis';
  } else if (this.timeAxis2 && util.hasParent(element, this.timeAxis2.dom.foreground)) {
    what = 'axis';
  } else if (util.hasParent(element, this.linegraph.yAxisLeft.dom.frame)) {
    what = 'data-axis';
  } else if (util.hasParent(element, this.linegraph.yAxisRight.dom.frame)) {
    what = 'data-axis';
  } else if (util.hasParent(element, this.linegraph.legendLeft.dom.frame)) {
    what = 'legend';
  } else if (util.hasParent(element, this.linegraph.legendRight.dom.frame)) {
    what = 'legend';
  } else if (customTime != null) {
    what = 'custom-time';
  } else if (util.hasParent(element, this.currentTime.bar)) {
    what = 'current-time';
  } else if (util.hasParent(element, this.dom.center)) {
    what = 'background';
  }

  var value = [];
  var yAxisLeft = this.linegraph.yAxisLeft;
  var yAxisRight = this.linegraph.yAxisRight;

  if (!yAxisLeft.hidden && this.itemsData.length > 0) {
    value.push(yAxisLeft.screenToValue(y));
  }

  if (!yAxisRight.hidden && this.itemsData.length > 0) {
    value.push(yAxisRight.screenToValue(y));
  }

  return {
    event: event,
    what: what,
    pageX: event.srcEvent ? event.srcEvent.pageX : event.pageX,
    pageY: event.srcEvent ? event.srcEvent.pageY : event.pageY,
    x: x,
    y: y,
    time: time,
    value: value
  };
};
/**
 * Load a configurator
 * @return {Object}
 * @private
 */


Graph2d.prototype._createConfigurator = function () {
  return new Configurator$2(this, this.dom.container, configureOptions$3);
};

var Graph2d_1 = Graph2d;

var util_1 = util;
var DOMutil$1 = DOMutil; // data

var DataSet$4 = index.DataSet,
    DataView$4 = index.DataView,
    Queue$1 = index.Queue;
var DataSet_1 = DataSet$4;
var DataView_1 = DataView$4;
var Queue_1 = Queue$1; // Timeline

var Timeline$1 = Timeline_1;
var Graph2d$1 = Graph2d_1;
var timeline = {
  Core: Core,
  DateUtil: DateUtil,
  Range: Range_1,
  stack: Stack,
  TimeStep: TimeStep_1,
  components: {
    items: {
      Item: Item,
      BackgroundItem: BackgroundItem_1,
      BoxItem: BoxItem_1,
      PointItem: PointItem_1,
      RangeItem: RangeItem_1
    },
    BackgroundGroup: BackgroundGroup_1,
    Component: Component_1,
    CurrentTime: CurrentTime_1,
    CustomTime: CustomTime,
    DataAxis: DataAxis,
    DataScale: DataScale_1,
    GraphGroup: GraphGroup_1,
    Group: Group_1,
    ItemSet: ItemSet,
    Legend: Legend_1,
    LineGraph: LineGraph_1,
    TimeAxis: TimeAxis
  }
}; // bundled external libraries

var moment$6 = moment$3;
var Hammer = hammer$1;
var keycharm$1 = keycharm;
var visTimeline = {
  util: util_1,
  DOMutil: DOMutil$1,
  DataSet: DataSet_1,
  DataView: DataView_1,
  Queue: Queue_1,
  Timeline: Timeline$1,
  Graph2d: Graph2d$1,
  timeline: timeline,
  moment: moment$6,
  Hammer: Hammer,
  keycharm: keycharm$1
};

export default visTimeline;
export { DOMutil$1 as DOMutil, DataSet_1 as DataSet, DataView_1 as DataView, Graph2d$1 as Graph2d, Hammer, Queue_1 as Queue, Timeline$1 as Timeline, keycharm$1 as keycharm, moment$6 as moment, timeline, util_1 as util };
//# sourceMappingURL=vis-timeline-graph2d.esm.js.map