luxon/src/impl/english.js

Immutable date wrapper

import * as Formats from './formats';
import { pick } from './util';

function stringify(obj) {
  return JSON.stringify(obj, Object.keys(obj).sort());
}

/**
 * @private
 */

export const monthsLong = [
  'January',
  'February',
  'March',
  'April',
  'May',
  'June',
  'July',
  'August',
  'September',
  'October',
  'November',
  'December'
];

export const monthsShort = [
  'Jan',
  'Feb',
  'Mar',
  'Apr',
  'May',
  'Jun',
  'Jul',
  'Aug',
  'Sep',
  'Oct',
  'Nov',
  'Dec'
];

export const monthsNarrow = ['J', 'F', 'M', 'A', 'M', 'J', 'J', 'A', 'S', 'O', 'N', 'D'];

export function months(length) {
  switch (length) {
    case 'narrow':
      return monthsNarrow;
    case 'short':
      return monthsShort;
    case 'long':
      return monthsLong;
    case 'numeric':
      return ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12'];
    case '2-digit':
      return ['01', '02', '03', '04', '05', '06', '07', '08', '09', '10', '11', '12'];
    default:
      return null;
  }
}

export const weekdaysLong = [
  'Monday',
  'Tuesday',
  'Wednesday',
  'Thursday',
  'Friday',
  'Saturday',
  'Sunday'
];

export const weekdaysShort = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'];

export const weekdaysNarrow = ['M', 'T', 'W', 'T', 'F', 'S', 'S'];

export function weekdays(length) {
  switch (length) {
    case 'narrow':
      return weekdaysNarrow;
    case 'short':
      return weekdaysShort;
    case 'long':
      return weekdaysLong;
    case 'numeric':
      return ['1', '2', '3', '4', '5', '6', '7'];
    default:
      return null;
  }
}

export const meridiems = ['AM', 'PM'];

export const erasLong = ['Before Christ', 'Anno Domini'];

export const erasShort = ['BC', 'AD'];

export const erasNarrow = ['B', 'A'];

export function eras(length) {
  switch (length) {
    case 'narrow':
      return erasNarrow;
    case 'short':
      return erasShort;
    case 'long':
      return erasLong;
    default:
      return null;
  }
}

export function meridiemForDateTime(dt) {
  return meridiems[dt.hour < 12 ? 0 : 1];
}

export function weekdayForDateTime(dt, length) {
  return weekdays(length)[dt.weekday - 1];
}

export function monthForDateTime(dt, length) {
  return months(length)[dt.month - 1];
}

export function eraForDateTime(dt, length) {
  return eras(length)[dt.year < 0 ? 0 : 1];
}

export function formatString(knownFormat) {
  // these all have the offsets removed because we don't have access to them
  // without all the intl stuff this is backfilling
  const filtered = pick(knownFormat, [
      'weekday',
      'era',
      'year',
      'month',
      'day',
      'hour',
      'minute',
      'second',
      'timeZoneName',
      'hour12'
    ]),
    key = stringify(filtered),
    dateTimeHuge = 'EEEE, LLLL d, yyyy, h:mm a';
  switch (key) {
    case stringify(Formats.DATE_SHORT):
      return 'M/d/yyyy';
    case stringify(Formats.DATE_MED):
      return 'LLL d, yyyy';
    case stringify(Formats.DATE_FULL):
      return 'LLLL d, yyyy';
    case stringify(Formats.DATE_HUGE):
      return 'EEEE, LLLL d, yyyy';
    case stringify(Formats.TIME_SIMPLE):
      return 'h:mm a';
    case stringify(Formats.TIME_WITH_SECONDS):
      return 'h:mm:ss a';
    case stringify(Formats.TIME_WITH_SHORT_OFFSET):
      return 'h:mm a';
    case stringify(Formats.TIME_WITH_LONG_OFFSET):
      return 'h:mm a';
    case stringify(Formats.TIME_24_SIMPLE):
      return 'HH:mm';
    case stringify(Formats.TIME_24_WITH_SECONDS):
      return 'HH:mm:ss';
    case stringify(Formats.TIME_24_WITH_SHORT_OFFSET):
      return 'HH:mm';
    case stringify(Formats.TIME_24_WITH_LONG_OFFSET):
      return 'HH:mm';
    case stringify(Formats.DATETIME_SHORT):
      return 'M/d/yyyy, h:mm a';
    case stringify(Formats.DATETIME_MED):
      return 'LLL d, yyyy, h:mm a';
    case stringify(Formats.DATETIME_FULL):
      return 'LLLL d, yyyy, h:mm a';
    case stringify(Formats.DATETIME_HUGE):
      return dateTimeHuge;
    case stringify(Formats.DATETIME_SHORT_WITH_SECONDS):
      return 'M/d/yyyy, h:mm:ss a';
    case stringify(Formats.DATETIME_MED_WITH_SECONDS):
      return 'LLL d, yyyy, h:mm:ss a';
    case stringify(Formats.DATETIME_FULL_WITH_SECONDS):
      return 'LLLL d, yyyy, h:mm:ss a';
    case stringify(Formats.DATETIME_HUGE_WITH_SECONDS):
      return 'EEEE, LLLL d, yyyy, h:mm:ss a';
    default:
      return dateTimeHuge;
  }
}