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LibJS: Implement StringPad abstract operation with UTF-16 code units

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Affects String.prototype.padStart and String.prototype.padEnd.
This commit is contained in:
Timothy Flynn 2021-07-19 14:36:30 -04:00 • committed by Andreas Kling
parent ef2ff5f88b
commit eaa1360eee
3 changed files with 51 additions and 7 deletions
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16
Userland/Libraries/LibJS/Tests/builtins/String/String.prototype.padEnd.js
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@ -16,3 +16,19 @@ test("basic functionality", () => {
expect(s.padEnd(10, "bar")).toBe("foobarbarb");
expect(s.padEnd(10, "123456789")).toBe("foo1234567");
});
test("UTF-16", () => {
var s = "😀";
expect(s).toHaveLength(2);
expect(s.padEnd(-1)).toBe("😀");
expect(s.padEnd(0)).toBe("😀");
expect(s.padEnd(1)).toBe("😀");
expect(s.padEnd(2)).toBe("😀");
expect(s.padEnd(3)).toBe("😀 ");
expect(s.padEnd(10)).toBe("😀 ");
expect(s.padEnd(2, "😀")).toBe("😀");
expect(s.padEnd(3, "😀")).toBe("😀\ud83d");
expect(s.padEnd(4, "😀")).toBe("😀😀");
expect(s.padEnd(5, "😀")).toBe("😀😀\ud83d");
});

16
Userland/Libraries/LibJS/Tests/builtins/String/String.prototype.padStart.js
View file

@ -16,3 +16,19 @@ test("basic functionality", () => {
expect(s.padStart(10, "bar")).toBe("barbarbfoo");
expect(s.padStart(10, "123456789")).toBe("1234567foo");
});
test("UTF-16", () => {
var s = "😀";
expect(s).toHaveLength(2);
expect(s.padStart(-1)).toBe("😀");
expect(s.padStart(0)).toBe("😀");
expect(s.padStart(1)).toBe("😀");
expect(s.padStart(2)).toBe("😀");
expect(s.padStart(3)).toBe(" 😀");
expect(s.padStart(10)).toBe(" 😀");
expect(s.padStart(2, "😀")).toBe("😀");
expect(s.padStart(3, "😀")).toBe("\ud83d😀");
expect(s.padStart(4, "😀")).toBe("😀😀");
expect(s.padStart(5, "😀")).toBe("😀\ud83d😀");
});