mirror of
https://github.com/LadybirdBrowser/ladybird
synced 2026-04-26 01:35:08 +02:00
a9bedc5a8d
Route the obvious substring-producing string operations through the new PrimitiveString substring factory. Direct indexing, at(), charAt(), slice(), substring(), substr(), and the plain-string split path can now return lazy JS::Substring values backed by the original string. Add runtime coverage for rope-backed string operations so these lazy string slices stay exercised across both ASCII and UTF-16 inputs.
26 lines
910 B
JavaScript
26 lines
910 B
JavaScript
test("string substring-producing operations work on ropes", () => {
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let rope = "ab" + "cd";
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expect(rope.at(1)).toBe("b");
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expect(rope.charAt(2)).toBe("c");
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expect(rope.slice(1, 3)).toBe("bc");
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expect(rope.substring(1, 3)).toBe("bc");
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expect(rope.substr(1, 2)).toBe("bc");
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expect(rope.split("b")).toEqual(["a", "cd"]);
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expect(rope[2]).toBe("c");
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expect(new String(rope)[2]).toBe("c");
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});
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test("string substring-producing operations preserve UTF-16 code units on ropes", () => {
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let rope = "😀" + "x";
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expect(rope.at(0)).toBe("\ud83d");
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expect(rope.charAt(1)).toBe("\ude00");
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expect(rope.slice(1, 3)).toBe("\ude00x");
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expect(rope.substring(1, 3)).toBe("\ude00x");
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expect(rope.substr(1, 2)).toBe("\ude00x");
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expect(rope.split("x")).toEqual(["😀", ""]);
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expect(rope[1]).toBe("\ude00");
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expect(new String(rope)[1]).toBe("\ude00");
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});
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