numberingSystem-option.js

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const defaultLocale = "en";

const defaultNumberingSystem = new Intl.DateTimeFormat(defaultLocale).resolvedOptions().numberingSystem;

function createWithLocale(locale, numberingSystem) {

  return new Intl.DateTimeFormat(locale, {numberingSystem});

function create(numberingSystem) {

  return createWithLocale(defaultLocale, numberingSystem);

// Empty string should throw.

assertThrowsInstanceOf(() => create(""), RangeError);

// Trailing \0 should throw.

assertThrowsInstanceOf(() => create("latn\0"), RangeError);

// Too short or too long strings should throw.

assertThrowsInstanceOf(() => create("a"), RangeError);

assertThrowsInstanceOf(() => create("toolongstring"), RangeError);

// Throw even when prefix is valid.

assertThrowsInstanceOf(() => create("latn-toolongstring"), RangeError);

// |numberingSystem| can be set to |undefined|.

let dtf = create(undefined);

assertEq(dtf.resolvedOptions().numberingSystem, defaultNumberingSystem);

// Unsupported numbering systems are ignored.

dtf = create("xxxxxxxx");

assertEq(dtf.resolvedOptions().numberingSystem, defaultNumberingSystem);

// Numbering system in options overwrite Unicode extension keyword.

dtf = createWithLocale(`${defaultLocale}-u-nu-thai`, "arab");

assertEq(dtf.resolvedOptions().locale, defaultLocale);

assertEq(dtf.resolvedOptions().numberingSystem, "arab");

// |numberingSystem| option ignores case.

dtf = create("ARAB");

assertEq(dtf.resolvedOptions().locale, defaultLocale);

assertEq(dtf.resolvedOptions().numberingSystem, "arab");

for (let [numberingSystem, {algorithmic}] of Object.entries(numberingSystems)) {

  let dtf1 = new Intl.DateTimeFormat(`${defaultLocale}-u-nu-${numberingSystem}`);

  let dtf2 = new Intl.DateTimeFormat(defaultLocale, {numberingSystem});

  if (!algorithmic) {

    assertEq(dtf1.resolvedOptions().numberingSystem, numberingSystem);

    assertEq(dtf2.resolvedOptions().numberingSystem, numberingSystem);

  } else {

    // We don't yet support algorithmic numbering systems.

    assertEq(dtf1.resolvedOptions().numberingSystem, defaultNumberingSystem);

    assertEq(dtf2.resolvedOptions().numberingSystem, defaultNumberingSystem);

  assertEq(dtf2.format(0), dtf1.format(0));

if (typeof reportCompare === "function")

  reportCompare(true, true);