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+import { get } from '../moment/get-set';
+import hasOwnProp from '../utils/has-own-prop';
+import { addFormatToken } from '../format/format';
+import { addUnitAlias } from './aliases';
+import { addUnitPriority } from './priorities';
+import { addRegexToken, match1to2, match2, matchWord, regexEscape } from '../parse/regex';
+import { addParseToken } from '../parse/token';
+import { hooks } from '../utils/hooks';
+import { MONTH } from './constants';
+import toInt from '../utils/to-int';
+import isArray from '../utils/is-array';
+import isNumber from '../utils/is-number';
+import mod from '../utils/mod';
+import indexOf from '../utils/index-of';
+import { createUTC } from '../create/utc';
+import getParsingFlags from '../create/parsing-flags';
+import { isLeapYear } from '../units/year';
+
+export 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?/;
+export var defaultLocaleMonths = 'January_February_March_April_May_June_July_August_September_October_November_December'.split('_');
+export 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()];
+}
+
+export var defaultLocaleMonthsShort = 'Jan_Feb_Mar_Apr_May_Jun_Jul_Aug_Sep_Oct_Nov_Dec'.split('_');
+export 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;
+ }
+ }
+}
+
+export 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
+
+export 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;
+}
+
+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());
+}
+
+var defaultMonthsShortRegex = matchWord;
+export 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;
+export 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');
+}