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LibJS: Implement Intl.PluralRules.prototype.select

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Timothy Flynn 2022-07-07 10:01:00 -04:00 • committed by Linus Groh
parent f11cb7c075
commit 36abcd820d
6 changed files with 270 additions and 0 deletions
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137
Userland/Libraries/LibJS/Tests/builtins/Intl/PluralRules/PluralRules.prototype.select.js Normal file
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describe("errors", () => {
test("called on non-PluralRules object", () => {
expect(() => {
Intl.PluralRules.prototype.select();
}).toThrowWithMessage(TypeError, "Not an object of type Intl.PluralRules");
});
test("called with value that cannot be converted to a number", () => {
expect(() => {
new Intl.PluralRules().select(Symbol.hasInstance);
}).toThrowWithMessage(TypeError, "Cannot convert symbol to number");
});
});
describe("non-finite values", () => {
test("NaN", () => {
expect(new Intl.PluralRules("en").select(NaN)).toBe("other");
expect(new Intl.PluralRules("ar").select(NaN)).toBe("other");
expect(new Intl.PluralRules("pl").select(NaN)).toBe("other");
});
test("Infinity", () => {
expect(new Intl.PluralRules("en").select(Infinity)).toBe("other");
expect(new Intl.PluralRules("ar").select(Infinity)).toBe("other");
expect(new Intl.PluralRules("pl").select(Infinity)).toBe("other");
});
test("-Infinity", () => {
expect(new Intl.PluralRules("en").select(-Infinity)).toBe("other");
expect(new Intl.PluralRules("ar").select(-Infinity)).toBe("other");
expect(new Intl.PluralRules("pl").select(-Infinity)).toBe("other");
});
});
describe("correct behavior", () => {
test("cardinal", () => {
const en = new Intl.PluralRules("en", { type: "cardinal" });
expect(en.select(0)).toBe("other");
expect(en.select(1)).toBe("one");
expect(en.select(2)).toBe("other");
expect(en.select(3)).toBe("other");
// In "he":
// "many" is specified to be integers larger than 10 which are multiples of 10.
const he = new Intl.PluralRules("he", { type: "cardinal" });
expect(he.select(0)).toBe("other");
expect(he.select(1)).toBe("one");
expect(en.select(2)).toBe("other");
expect(he.select(10)).toBe("other");
expect(he.select(19)).toBe("other");
expect(he.select(20)).toBe("many");
expect(he.select(21)).toBe("other");
expect(he.select(29)).toBe("other");
expect(he.select(30)).toBe("many");
expect(he.select(31)).toBe("other");
// In "pl":
// "few" is specified to be integers such that (i % 10 == 2..4 && i % 100 != 12..14).
// "many" is specified to be all other integers != 1.
// "other" is specified to be non-integers.
const pl = new Intl.PluralRules("pl", { type: "cardinal" });
expect(pl.select(0)).toBe("many");
expect(pl.select(1)).toBe("one");
expect(pl.select(2)).toBe("few");
expect(pl.select(3)).toBe("few");
expect(pl.select(4)).toBe("few");
expect(pl.select(5)).toBe("many");
expect(pl.select(12)).toBe("many");
expect(pl.select(13)).toBe("many");
expect(pl.select(14)).toBe("many");
expect(pl.select(21)).toBe("many");
expect(pl.select(22)).toBe("few");
expect(pl.select(23)).toBe("few");
expect(pl.select(24)).toBe("few");
expect(pl.select(25)).toBe("many");
expect(pl.select(3.14)).toBe("other");
// In "am":
// "one" is specified to be the integers 0 and 1, and non-integers whose integer part is 0.
const am = new Intl.PluralRules("am", { type: "cardinal" });
expect(am.select(0)).toBe("one");
expect(am.select(0.1)).toBe("one");
expect(am.select(0.2)).toBe("one");
expect(am.select(0.8)).toBe("one");
expect(am.select(0.9)).toBe("one");
expect(am.select(1)).toBe("one");
expect(am.select(1.1)).toBe("other");
expect(am.select(1.9)).toBe("other");
expect(am.select(2)).toBe("other");
expect(am.select(3)).toBe("other");
});
test("ordinal", () => {
// In "en":
// "one" is specified to be integers such that (i % 10 == 1), excluding 11.
// "two" is specified to be integers such that (i % 10 == 2), excluding 12.
// "few" is specified to be integers such that (i % 10 == 3), excluding 13.
const en = new Intl.PluralRules("en", { type: "ordinal" });
expect(en.select(0)).toBe("other");
expect(en.select(1)).toBe("one");
expect(en.select(2)).toBe("two");
expect(en.select(3)).toBe("few");
expect(en.select(4)).toBe("other");
expect(en.select(10)).toBe("other");
expect(en.select(11)).toBe("other");
expect(en.select(12)).toBe("other");
expect(en.select(13)).toBe("other");
expect(en.select(14)).toBe("other");
expect(en.select(20)).toBe("other");
expect(en.select(21)).toBe("one");
expect(en.select(22)).toBe("two");
expect(en.select(23)).toBe("few");
expect(en.select(24)).toBe("other");
// In "mk":
// "one" is specified to be integers such that (i % 10 == 1 && i % 100 != 11).
// "two" is specified to be integers such that (i % 10 == 2 && i % 100 != 12).
// "many" is specified to be integers such that (i % 10 == 7,8 && i % 100 != 17,18).
const mk = new Intl.PluralRules("mk", { type: "ordinal" });
expect(mk.select(0)).toBe("other");
expect(mk.select(1)).toBe("one");
expect(mk.select(2)).toBe("two");
expect(mk.select(3)).toBe("other");
expect(mk.select(6)).toBe("other");
expect(mk.select(7)).toBe("many");
expect(mk.select(8)).toBe("many");
expect(mk.select(9)).toBe("other");
expect(mk.select(11)).toBe("other");
expect(mk.select(12)).toBe("other");
expect(mk.select(17)).toBe("other");
expect(mk.select(18)).toBe("other");
expect(mk.select(21)).toBe("one");
expect(mk.select(22)).toBe("two");
expect(mk.select(27)).toBe("many");
expect(mk.select(28)).toBe("many");
});
});