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LibJS: Don't treat '?.' followed by decimal digit as QuestionMarkPeriod

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From the spec: https://tc39.es/ecma262/#sec-punctuators

    OptionalChainingPunctuator ::
        ?. [lookahead ∉ DecimalDigit]

We were missing the lookahead and therefore incorrectly treating any
'?.' as TokenType::QuestionMarkPeriod.

Fixes #4409.
This commit is contained in:
Linus Groh 2020-12-14 13:05:24 +00:00 • committed by Andreas Kling
parent 6e7edd6e77
commit 0974991d05
2 changed files with 11 additions and 4 deletions
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4
Libraries/LibJS/Tests/operators/ternary-basic.js
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@ -14,3 +14,7 @@ test("object values", () => {
expect(o.f ? true : false).toBeTrue();
expect(1 ? o.f : null).toBeTrue();
});
test("issue #4409, '?.' followed by decimal digit", () => {
expect("return false?.1:.2").toEvalTo(0.2);
});