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LibJS: Add more duplicated declarations detection

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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.
This commit is contained in:
davidot 2021-07-29 01:43:08 +02:00 • committed by Linus Groh
parent 085c7df895
commit 26177b1826
1 changed files with 29 additions and 1 deletions
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30
Userland/Libraries/LibJS/Parser.cpp
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@ -2084,6 +2084,22 @@ NonnullRefPtr<VariableDeclaration> Parser::parse_variable_declaration(bool for_l
// FIXME: We should check the var_scopes here as well however this has edges cases with for loops.
// See duplicated-variable-declarations.js.
if (!m_state.function_parameters.is_empty() && m_state.current_scope->parent->type == Scope::Function) {
for (auto& parameter : m_state.function_parameters.last()) {
parameter.binding.visit(
[&](FlyString const& parameter_name) {
if (parameter_name == name)
syntax_error(String::formatted("Identifier '{}' has already been declared", name), identifier_start.position());
},
[&](NonnullRefPtr<BindingPattern> const& binding) {
binding->for_each_bound_name([&](auto& bound_name) {
if (bound_name == name)
syntax_error(String::formatted("Identifier '{}' has already been declared", name), identifier_start.position());
});
});
}
}
for (auto& declaration : declarations) {
check_declarations(declaration);
}
@ -2092,9 +2108,21 @@ NonnullRefPtr<VariableDeclaration> Parser::parse_variable_declaration(bool for_l
target = pattern.release_nonnull();
if ((declaration_kind == DeclarationKind::Let || declaration_kind == DeclarationKind::Const)) {
target.get<NonnullRefPtr<BindingPattern>>()->for_each_bound_name([this](auto& name) {
target.get<NonnullRefPtr<BindingPattern>>()->for_each_bound_name([this, &declarations](auto& name) {
if (name == "let"sv)
syntax_error("Lexical binding may not be called 'let'");
// FIXME: Again we do not check everything here see for example the parameter check above.
// However a more sustainable solution should be used since these checks are now spread over multiple sites.
for (auto& declaration : declarations) {
declaration.target().visit(
[&](NonnullRefPtr<Identifier> const& identifier) {
if (identifier->string() == name)
syntax_error(String::formatted("Identifier '{}' has already been declared", name));
},
[&](auto const&) {});
}
});
}
} else if (!m_state.in_generator_function_context && match(TokenType::Yield)) {