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LibJS: Disallow shorthand properties with reserved names
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2 changed files with 56 additions and 0 deletions
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@ -1497,6 +1497,8 @@ NonnullRefPtr<ObjectExpression> Parser::parse_object_expression()
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auto lookahead_token = next_token();
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if (lookahead_token.type() != TokenType::ParenOpen && lookahead_token.type() != TokenType::Colon
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&& lookahead_token.type() != TokenType::Comma && lookahead_token.type() != TokenType::CurlyClose
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&& lookahead_token.type() != TokenType::Async
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&& !lookahead_token.trivia_contains_line_terminator()) {
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consume(TokenType::Async);
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function_kind = FunctionKind::Async;
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@ -1567,6 +1569,12 @@ NonnullRefPtr<ObjectExpression> Parser::parse_object_expression()
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}
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properties.append(create_ast_node<ObjectProperty>({ m_state.current_token.filename(), rule_start.position(), position() }, *property_name, parse_expression(2), property_type, false));
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} else if (property_name && property_value) {
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if (m_state.strict_mode && is<StringLiteral>(*property_name)) {
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auto& string_literal = static_cast<StringLiteral const&>(*property_name);
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if (is_strict_reserved_word(string_literal.value()))
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syntax_error(String::formatted("'{}' is a reserved keyword", string_literal.value()));
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}
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properties.append(create_ast_node<ObjectProperty>({ m_state.current_token.filename(), rule_start.position(), position() }, *property_name, *property_value, property_type, false));
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} else {
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expected("a property");
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@ -151,6 +151,54 @@ describe("side effects", () => {
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});
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});
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describe("shorthanded properties with special names", () => {
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test("keywords cannot be used", () => {
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expect("({ function, })").not.toEval();
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expect("({ var, })").not.toEval();
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expect("({ const, })").not.toEval();
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expect("({ class, })").not.toEval();
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});
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test("reserved words are allowed in non-strict mode", () => {
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{
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var implements = 3;
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expect({ implements }).toEqual({ implements: 3 });
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}
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{
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var public = "a";
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expect({ public }).toEqual({ public: "a" });
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}
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{
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var let = 9;
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expect({ let }).toEqual({ let: 9 });
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}
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{
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var await = 8;
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expect({ await }).toEqual({ await: 8 });
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}
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{
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var async = 7;
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expect({ async }).toEqual({ async: 7 });
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}
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{
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var yield = 6;
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expect({ yield }).toEqual({ yield: 6 });
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}
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});
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test("reserved words are not allowed in strict mode", () => {
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expect('"use strict"; var implements = 3; ({ implements })').not.toEval();
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expect("\"use strict\"; var public = 'a'; ({ public })").not.toEval();
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expect('"use strict"; var let = 9; ({ let, })').not.toEval();
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expect('"use strict"; var yield = 6; ({ yield, })').not.toEval();
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});
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test("special non reserved words are allowed even in strict mode", () => {
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expect('"use strict"; var await = 8; ({ await, })').toEval();
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expect('"use strict"; var async = 7; ({ async, })').toEval();
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});
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});
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describe("errors", () => {
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test("syntax errors", () => {
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expect("({ foo: function() { super.bar; } })").not.toEval();
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