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LibJS: Don't match async \n function as an async function declaration

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davidot 2021-11-30 15:52:51 +01:00 • committed by Linus Groh
parent c2ebaa9d87
commit 5010d4c20c
2 changed files with 27 additions and 5 deletions
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17
Userland/Libraries/LibJS/Parser.cpp
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@ -631,10 +631,15 @@ NonnullRefPtr<Statement> Parser::parse_statement(AllowLabelledFunction allow_lab
return result.release_nonnull();
}
if (match_expression()) {
if (match(TokenType::Function) || (match(TokenType::Async) && next_token().type() == TokenType::Function) || match(TokenType::Class))
if (match(TokenType::Async)) {
auto lookahead_token = next_token();
if (lookahead_token.type() == TokenType::Function && !lookahead_token.trivia_contains_line_terminator())
syntax_error("Async function declaration not allowed in single-statement context");
} else if (match(TokenType::Function) || match(TokenType::Class)) {
syntax_error(String::formatted("{} declaration not allowed in single-statement context", m_state.current_token.name()));
if (match(TokenType::Let) && next_token().type() == TokenType::BracketOpen)
} else if (match(TokenType::Let) && next_token().type() == TokenType::BracketOpen) {
syntax_error(String::formatted("let followed by [ is not allowed in single-statement context"));
}
auto expr = parse_expression(0);
consume_or_insert_semicolon();
@ -3608,11 +3613,15 @@ bool Parser::match_declaration() const
return try_match_let_declaration();
}
if (type == TokenType::Async) {
auto lookahead_token = next_token();
return lookahead_token.type() == TokenType::Function && !lookahead_token.trivia_contains_line_terminator();
}
return type == TokenType::Function
|| type == TokenType::Class
|| type == TokenType::Const
|| type == TokenType::Let
|| (type == TokenType::Async && next_token().type() == TokenType::Function);
|| type == TokenType::Let;
}
Token Parser::next_token() const