text: import { get } from '../moment/get-set';
  import { addFormatToken } from '../format/format';
  import { addUnitAlias } from './aliases';
  import { addRegexToken, match1to2, match2, matchWord } from '../parse/regex';
  import { addParseToken } from '../parse/token';
  import { hooks } from '../utils/hooks';
  import { MONTH } from './constants';
  import toInt from '../utils/to-int';
  import { createUTC } from '../create/utc';
  import getParsingFlags from '../create/parsing-flags';
  
  export function daysInMonth(year, month) {
      return new Date(Date.UTC(year, month + 1, 0)).getUTCDate();
  }
  
  // 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');
  
  // PARSING
  
  addRegexToken('M',    match1to2);
  addRegexToken('MM',   match1to2, match2);
  addRegexToken('MMM',  matchWord);
  addRegexToken('MMMM', matchWord);
  
  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
  
  export var defaultLocaleMonths = 'January_February_March_April_May_June_July_August_September_October_November_December'.split('_');
  export function localeMonths (m) {
      return this._months[m.month()];
  }
  
  export var defaultLocaleMonthsShort = 'Jan_Feb_Mar_Apr_May_Jun_Jul_Aug_Sep_Oct_Nov_Dec'.split('_');
  export function localeMonthsShort (m) {
      return this._monthsShort[m.month()];
  }
  
  export function localeMonthsParse (monthName, format, strict) {
      var i, mom, regex;
  
      if (!this._monthsParse) {
          this._monthsParse = [];
          this._longMonthsParse = [];
          this._shortMonthsParse = [];
      }
  
      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
  
  export function setMonth (mom, value) {
      var dayOfMonth;
  
      // TODO: Move this out of here!
      if (typeof value === 'string') {
          value = mom.localeData().monthsParse(value);
          // TODO: Another silent failure?
          if (typeof value !== 'number') {
              return mom;
          }
      }
  
      dayOfMonth = Math.min(mom.date(), daysInMonth(mom.year(), value));
      mom._d['set' + (mom._isUTC ? 'UTC' : '') + 'Month'](value, dayOfMonth);
      return mom;
  }
  
  export function getSetMonth (value) {
      if (value != null) {
          setMonth(this, value);
          hooks.updateOffset(this, true);
          return this;
      } else {
          return get(this, 'Month');
      }
  }
  
  export function getDaysInMonth () {
      return daysInMonth(this.year(), this.month());
  }
  