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LibJS: Add FIXMEs for parsing increment operators with function LHS/RHS

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The parser considers it a syntax error at the moment, other engines
throw a ReferenceError during runtime for ++foo(), --foo(), foo()++ and
foo()--, so I assume the spec defines this.
This commit is contained in:
Linus Groh 2020-09-16 20:03:06 +01:00 • committed by Andreas Kling
parent fd32f00839
commit 5fd87ccd16
1 changed files with 8 additions and 0 deletions
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8
Libraries/LibJS/Parser.cpp
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@ -653,6 +653,8 @@ NonnullRefPtr<Expression> Parser::parse_unary_prefixed_expression()
auto rhs_start_line = m_parser_state.m_current_token.line_number();
auto rhs_start_column = m_parser_state.m_current_token.line_column();
auto rhs = parse_expression(precedence, associativity);
// FIXME: Apparently for functions this should also not be enforced on a parser level,
// other engines throw ReferenceError for ++foo()
if (!rhs->is_identifier() && !rhs->is_member_expression())
syntax_error(String::format("Right-hand side of prefix increment operator must be identifier or member expression, got %s", rhs->class_name()), rhs_start_line, rhs_start_column);
return create_ast_node<UpdateExpression>(UpdateOp::Increment, move(rhs), true);
@ -662,6 +664,8 @@ NonnullRefPtr<Expression> Parser::parse_unary_prefixed_expression()
auto rhs_start_line = m_parser_state.m_current_token.line_number();
auto rhs_start_column = m_parser_state.m_current_token.line_column();
auto rhs = parse_expression(precedence, associativity);
// FIXME: Apparently for functions this should also not be enforced on a parser level,
// other engines throw ReferenceError for --foo()
if (!rhs->is_identifier() && !rhs->is_member_expression())
syntax_error(String::format("Right-hand side of prefix decrement operator must be identifier or member expression, got %s", rhs->class_name()), rhs_start_line, rhs_start_column);
return create_ast_node<UpdateExpression>(UpdateOp::Decrement, move(rhs), true);
@ -1096,11 +1100,15 @@ NonnullRefPtr<Expression> Parser::parse_secondary_expression(NonnullRefPtr<Expre
return expression;
}
case TokenType::PlusPlus:
// FIXME: Apparently for functions this should also not be enforced on a parser level,
// other engines throw ReferenceError for foo()++
if (!lhs->is_identifier() && !lhs->is_member_expression())
syntax_error(String::format("Left-hand side of postfix increment operator must be identifier or member expression, got %s", lhs->class_name()));
consume();
return create_ast_node<UpdateExpression>(UpdateOp::Increment, move(lhs));
case TokenType::MinusMinus:
// FIXME: Apparently for functions this should also not be enforced on a parser level,
// other engines throw ReferenceError for foo()--
if (!lhs->is_identifier() && !lhs->is_member_expression())
syntax_error(String::format("Left-hand side of postfix increment operator must be identifier or member expression, got %s", lhs->class_name()));
consume();