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LibJS: Use Identifier to represent FunctionParameter name

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Using identifier instead of string allows to store supplemental
information about whether it can be represented as local variable.
This commit is contained in:
Aliaksandr Kalenik 2023-07-06 17:49:38 +02:00 • committed by Andreas Kling
parent 2f1d6c0b9a
commit 2e81cc4cf7
5 changed files with 50 additions and 31 deletions
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27
Userland/Libraries/LibJS/Parser.cpp
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@ -79,8 +79,8 @@ public:
scope_pusher.m_function_parameters = parameters;
for (auto& parameter : parameters) {
parameter.binding.visit(
[&](DeprecatedFlyString const& name) {
scope_pusher.m_forbidden_lexical_names.set(name);
[&](Identifier const& identifier) {
scope_pusher.m_forbidden_lexical_names.set(identifier.string());
},
[&](NonnullRefPtr<BindingPattern const> const& binding_pattern) {
// NOTE: Nothing in the callback throws an exception.
@ -864,7 +864,7 @@ static bool is_strict_reserved_word(StringView str)
static bool is_simple_parameter_list(Vector<FunctionParameter> const& parameters)
{
return all_of(parameters, [](FunctionParameter const& parameter) {
return !parameter.is_rest && parameter.default_value.is_null() && parameter.binding.has<DeprecatedFlyString>();
return !parameter.is_rest && parameter.default_value.is_null() && parameter.binding.has<NonnullRefPtr<Identifier const>>();
});
}
@ -939,7 +939,8 @@ RefPtr<FunctionExpression const> Parser::try_parse_arrow_function_expression(boo
syntax_error("BindingIdentifier may not be 'arguments' or 'eval' in strict mode");
if (is_async && token.value() == "await"sv)
syntax_error("'await' is a reserved identifier in async functions");
parameters.append({ DeprecatedFlyString { token.value() }, {} });
auto identifier = create_ast_node<Identifier const>({ m_source_code, rule_start.position(), position() }, token.DeprecatedFlyString_value());
parameters.append({ identifier, {} });
}
// If there's a newline between the closing paren and arrow it's not a valid arrow function,
// ASI should kick in instead (it'll then fail with "Unexpected token Arrow")
@ -1003,8 +1004,8 @@ RefPtr<FunctionExpression const> Parser::try_parse_arrow_function_expression(boo
if (body->in_strict_mode()) {
for (auto& parameter : parameters) {
parameter.binding.visit(
[&](DeprecatedFlyString const& name) {
check_identifier_name_for_assignment_validity(name, true);
[&](Identifier const& identifier) {
check_identifier_name_for_assignment_validity(identifier.string(), true);
},
[&](auto const&) {});
}
@ -1495,7 +1496,7 @@ NonnullRefPtr<ClassExpression const> Parser::parse_class_expression(bool expect_
// this function does not.
// So we use a custom version of SuperCall which doesn't use the @@iterator
// method on %Array.prototype% visibly.
DeprecatedFlyString argument_name = "args";
auto argument_name = create_ast_node<Identifier const>({ m_source_code, rule_start.position(), position() }, "args");
auto super_call = create_ast_node<SuperCall>(
{ m_source_code, rule_start.position(), position() },
SuperCall::IsPartOfSyntheticConstructor::Yes,
@ -2675,7 +2676,9 @@ NonnullRefPtr<FunctionBody const> Parser::parse_function_body(Vector<FunctionPar
Vector<StringView> parameter_names;
for (auto& parameter : parameters) {
parameter.binding.visit(
[&](DeprecatedFlyString const& parameter_name) {
[&](Identifier const& identifier) {
auto const& parameter_name = identifier.string();
check_identifier_name_for_assignment_validity(parameter_name, function_body->in_strict_mode());
if (function_kind == FunctionKind::Generator && parameter_name == "yield"sv)
syntax_error("Parameter name 'yield' not allowed in this context");
@ -2842,7 +2845,7 @@ Vector<FunctionParameter> Parser::parse_formal_parameters(int& function_length,
Vector<FunctionParameter> parameters;
auto consume_identifier_or_binding_pattern = [&]() -> Variant<DeprecatedFlyString, NonnullRefPtr<BindingPattern const>> {
auto consume_identifier_or_binding_pattern = [&]() -> Variant<NonnullRefPtr<Identifier const>, NonnullRefPtr<BindingPattern const>> {
if (auto pattern = parse_binding_pattern(AllowDuplicates::No, AllowMemberExpressions::No))
return pattern.release_nonnull();
@ -2853,8 +2856,8 @@ Vector<FunctionParameter> Parser::parse_formal_parameters(int& function_length,
for (auto& parameter : parameters) {
bool has_same_name = parameter.binding.visit(
[&](DeprecatedFlyString const& name) {
return name == parameter_name;
[&](Identifier const& identifier) {
return identifier.string() == parameter_name;
},
[&](NonnullRefPtr<BindingPattern const> const& bindings) {
bool found_duplicate = false;
@ -2882,7 +2885,7 @@ Vector<FunctionParameter> Parser::parse_formal_parameters(int& function_length,
syntax_error(message, Position { token.line_number(), token.line_column() });
break;
}
return DeprecatedFlyString { token.value() };
return create_ast_node<Identifier const>({ m_source_code, rule_start.position(), position() }, token.DeprecatedFlyString_value());
};
while (match(TokenType::CurlyOpen) || match(TokenType::BracketOpen) || match_identifier() || match(TokenType::TripleDot)) {