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LibJS: Add more duplicated declarations detection
This is a small step in the right direction although the amount of different checks is becoming unsustainable. In the future we probably want to have the current_scope handle all declarations.
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1 changed files with 29 additions and 1 deletions
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@ -2084,6 +2084,22 @@ NonnullRefPtr<VariableDeclaration> Parser::parse_variable_declaration(bool for_l
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// FIXME: We should check the var_scopes here as well however this has edges cases with for loops.
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// See duplicated-variable-declarations.js.
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if (!m_state.function_parameters.is_empty() && m_state.current_scope->parent->type == Scope::Function) {
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for (auto& parameter : m_state.function_parameters.last()) {
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parameter.binding.visit(
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[&](FlyString const& parameter_name) {
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if (parameter_name == name)
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syntax_error(String::formatted("Identifier '{}' has already been declared", name), identifier_start.position());
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},
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[&](NonnullRefPtr<BindingPattern> const& binding) {
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binding->for_each_bound_name([&](auto& bound_name) {
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if (bound_name == name)
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syntax_error(String::formatted("Identifier '{}' has already been declared", name), identifier_start.position());
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});
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});
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}
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}
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for (auto& declaration : declarations) {
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check_declarations(declaration);
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}
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@ -2092,9 +2108,21 @@ NonnullRefPtr<VariableDeclaration> Parser::parse_variable_declaration(bool for_l
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target = pattern.release_nonnull();
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if ((declaration_kind == DeclarationKind::Let || declaration_kind == DeclarationKind::Const)) {
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target.get<NonnullRefPtr<BindingPattern>>()->for_each_bound_name([this](auto& name) {
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target.get<NonnullRefPtr<BindingPattern>>()->for_each_bound_name([this, &declarations](auto& name) {
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if (name == "let"sv)
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syntax_error("Lexical binding may not be called 'let'");
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// FIXME: Again we do not check everything here see for example the parameter check above.
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// However a more sustainable solution should be used since these checks are now spread over multiple sites.
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for (auto& declaration : declarations) {
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declaration.target().visit(
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[&](NonnullRefPtr<Identifier> const& identifier) {
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if (identifier->string() == name)
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syntax_error(String::formatted("Identifier '{}' has already been declared", name));
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},
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[&](auto const&) {});
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}
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});
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}
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} else if (!m_state.in_generator_function_context && match(TokenType::Yield)) {
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