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LibJS: Parse labelled statements

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All statements now have an optional label string that can be null.
This commit is contained in:
Matthew Olsson 2020-05-28 11:09:19 -07:00 • committed by Andreas Kling
parent 5cd01ed79e
commit 10bf4ba3dc
4 changed files with 44 additions and 0 deletions
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24
Libraries/LibJS/Parser.cpp
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@ -269,6 +269,9 @@ NonnullRefPtr<Statement> Parser::parse_statement()
consume();
return create_ast_node<EmptyStatement>();
default:
auto result = try_parse_labelled_statement();
if (!result.is_null())
return result.release_nonnull();
if (match_expression()) {
auto expr = parse_expression(0);
consume_or_insert_semicolon();
@ -383,6 +386,27 @@ RefPtr<FunctionExpression> Parser::try_parse_arrow_function_expression(bool expe
return nullptr;
}
RefPtr<Statement> Parser::try_parse_labelled_statement()
{
save_state();
ArmedScopeGuard state_rollback_guard = [&] {
load_state();
};
auto identifier = consume(TokenType::Identifier).value();
if (!match(TokenType::Colon))
return {};
consume(TokenType::Colon);
if (!match_statement())
return {};
auto statement = parse_statement();
statement->set_label(identifier);
state_rollback_guard.disarm();
return statement;
}
NonnullRefPtr<Expression> Parser::parse_primary_expression()
{
if (match_unary_prefixed_expression())