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LibJS: Parse slashes after reserved identifiers correctly

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Previously we were unable to parse code like `yield/2` because `/2`
was parsed as a regex. At the same time `for (a in / b/)` was parsed
as a division.

This is solved by defaulting to division in the lexer, but calling
`force_slash_as_regex()` from the parser whenever an IdentifierName
is parsed as a ReservedWord.
This commit is contained in:
Simon Wanner 2023-05-28 00:08:52 +02:00 • committed by Andreas Kling
parent b0bd1e5eb5
commit a2efecac03
6 changed files with 65 additions and 25 deletions
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11
Userland/Libraries/LibJS/Lexer.cpp
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@ -500,23 +500,18 @@ bool Lexer::is_numeric_literal_start() const
bool Lexer::slash_means_division() const
{
auto type = m_current_token.type();
return type == TokenType::BigIntLiteral
|| type == TokenType::BoolLiteral
return m_current_token.is_identifier_name()
|| type == TokenType::BigIntLiteral
|| type == TokenType::BracketClose
|| type == TokenType::CurlyClose
|| type == TokenType::Identifier
|| type == TokenType::In
|| type == TokenType::Instanceof
|| type == TokenType::MinusMinus
|| type == TokenType::NullLiteral
|| type == TokenType::NumericLiteral
|| type == TokenType::ParenClose
|| type == TokenType::PlusPlus
|| type == TokenType::PrivateIdentifier
|| type == TokenType::RegexLiteral
|| type == TokenType::StringLiteral
|| type == TokenType::TemplateLiteralEnd
|| type == TokenType::This;
|| type == TokenType::TemplateLiteralEnd;
}
Token Lexer::next()