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LibJS: Add support for the '#privateName in obj' expression

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davidot 2021-10-14 02:05:24 +02:00 committed by Linus Groh
parent 16cc82460f
commit 7e8724db71
Notes: sideshowbarker 2024-07-18 02:07:53 +09:00 
Author: https://github.com/davidot
Commit: https://github.com/SerenityOS/serenity/commit/7e8724db71a
Pull-request: https://github.com/SerenityOS/serenity/pull/10470
Issue: https://github.com/SerenityOS/serenity/issues/7044
Issue: https://github.com/SerenityOS/serenity/issues/8574
Reviewed-by: https://github.com/linusg
2 changed files with 23 additions and 0 deletions
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18
Userland/Libraries/LibJS/AST.cpp
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@ -902,6 +902,24 @@ Value BinaryExpression::execute(Interpreter& interpreter, GlobalObject& global_o
{
InterpreterNodeScope node_scope { interpreter, *this };
// Special case in which we cannot execute the lhs. RelationalExpression : PrivateIdentifier in ShiftExpression
// RelationalExpression : PrivateIdentifier in ShiftExpression, https://tc39.es/ecma262/#sec-relational-operators-runtime-semantics-evaluation
if (m_op == BinaryOp::In && is<PrivateIdentifier>(*m_lhs)) {
auto& private_identifier = static_cast<PrivateIdentifier const&>(*m_lhs).string();
auto rhs_result = m_rhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
if (!rhs_result.is_object()) {
interpreter.vm().throw_exception<TypeError>(global_object, ErrorType::InOperatorWithObject);
return {};
}
auto* private_environment = interpreter.vm().running_execution_context().private_environment;
VERIFY(private_environment);
auto private_name = private_environment->resolve_private_identifier(private_identifier);
return Value(rhs_result.as_object().private_element_find(private_name) != nullptr);
}
auto lhs_result = m_lhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};

5
Userland/Libraries/LibJS/Parser.cpp
View file

@ -1214,6 +1214,11 @@ Parser::PrimaryExpressionParseResult Parser::parse_primary_expression()
if (!m_state.in_generator_function_context)
goto read_as_identifier;
return { parse_yield_expression(), false };
case TokenType::PrivateIdentifier:
VERIFY(next_token().type() == TokenType::In);
if (!is_private_identifier_valid())
syntax_error(String::formatted("Reference to undeclared private field or method '{}'", m_state.current_token.value()));
return { create_ast_node<PrivateIdentifier>({ m_state.current_token.filename(), rule_start.position(), position() }, consume().value()) };
default:
if (match_identifier_name())
goto read_as_identifier;