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https://github.com/LadybirdBrowser/ladybird
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29c2fb9574
Track whether a pattern can match empty and only skip interior surrogate positions when the matcher must consume input. This keeps the unicode candidate scan fast for consuming searches without dropping valid zero-width matches such as /\B/ and /(?!...)/ between a surrogate pair's two code units. Add runtime coverage for both global lastIndex searches and plain exec() searches on zero-width unicode patterns.
16 lines
485 B
JavaScript
16 lines
485 B
JavaScript
test("unicode zero-width patterns can match at surrogate interior positions", () => {
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let global_matcher = /\B/gu;
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global_matcher.lastIndex = 2;
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let match = global_matcher.exec("A😀");
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expect(match).not.toBeNull();
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expect(match[0]).toBe("");
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expect(match.index).toBe(2);
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expect(global_matcher.lastIndex).toBe(2);
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match = /(?!😀)/u.exec("😀");
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expect(match).not.toBeNull();
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expect(match[0]).toBe("");
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expect(match.index).toBe(1);
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});
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