| // Copyright (C) 2021 André Bargull. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-intl.supportedvaluesof |
| description: > |
| The returned "calendar" values are sorted, unique, and match the type production. |
| info: | |
| Intl.supportedValuesOf ( key ) |
| |
| 1. Let key be ? ToString(key). |
| 2. If key is "calendar", then |
| a. Let list be ! AvailableCalendars( ). |
| ... |
| 9. Return ! CreateArrayFromList( list ). |
| |
| AvailableCalendars ( ) |
| The AvailableCalendars abstract operation returns a List, ordered as if an |
| Array of the same values had been sorted using %Array.prototype.sort% using |
| undefined as comparefn, that contains unique calendar types identifying the |
| calendars for which the implementation provides the functionality of |
| Intl.DateTimeFormat objects. The list must include "gregory". |
| includes: [compareArray.js] |
| features: [Intl-enumeration, Intl.Locale] |
| ---*/ |
| |
| const calendars = Intl.supportedValuesOf("calendar"); |
| |
| assert(Array.isArray(calendars), "Returns an Array object."); |
| assert.sameValue(Object.getPrototypeOf(calendars), Array.prototype, |
| "The array prototype is Array.prototype"); |
| |
| const otherCalendars = Intl.supportedValuesOf("calendar"); |
| assert.notSameValue(otherCalendars, calendars, |
| "Returns a new array object for each call."); |
| |
| assert.compareArray(calendars, otherCalendars.sort(), |
| "The array is sorted."); |
| |
| assert.sameValue(new Set(calendars).size, calendars.length, |
| "The array doesn't contain duplicates."); |
| |
| // https://unicode.org/reports/tr35/tr35.html#Unicode_locale_identifier |
| const typeRE = /^[a-z0-9]{3,8}(-[a-z0-9]{3,8})*$/; |
| for (let calendar of calendars) { |
| assert(typeRE.test(calendar), `${calendar} matches the 'type' production`); |
| } |
| |
| for (let calendar of calendars) { |
| assert.sameValue(new Intl.Locale("und", {calendar}).calendar, calendar, |
| `${calendar} is canonicalised`); |
| } |
| |
| assert(calendars.includes("gregory"), "Includes the Gregorian calendar."); |