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Code Issues Projects Releases Packages Wiki Activity Actions 10

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
commit 0974991d05
Notes: sideshowbarker 2024-07-19 00:52:17 +09:00
2 changed files with 11 additions and 4 deletions
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11
Libraries/LibJS/Lexer.cpp
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@ -598,10 +598,13 @@ Token Lexer::next()
auto two_chars_view = m_source.substring_view(m_position - 1, 2);
auto it = s_two_char_tokens.find(two_chars_view.hash(), [&](auto& entry) { return entry.key == two_chars_view; });
if (it != s_two_char_tokens.end()) {
found_two_char_token = true;
consume();
consume();
token_type = it->value;
// OptionalChainingPunctuator :: ?. [lookahead ∉ DecimalDigit]
if (!(it->value == TokenType::QuestionMarkPeriod && m_position + 1 < m_source.length() && isdigit(m_source[m_position + 1]))) {
found_two_char_token = true;
consume();
consume();
token_type = it->value;
}
}
}