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// 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, Array.prototype.includes]
---*/
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.");
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.");
reportCompare(0, 0);