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’;

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 {
    config._pf.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());

}