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LibJS: Convert set_mutable_binding() to ThrowCompletionOr

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Also add spec step comments to it while we're here.
This commit is contained in:
Linus Groh 2021-10-09 19:34:54 +01:00
parent ae397541fb
commit 7652138ce0
11 changed files with 68 additions and 52 deletions
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45
Userland/Libraries/LibJS/Runtime/DeclarativeEnvironment.cpp
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@ -106,40 +106,49 @@ ThrowCompletionOr<void> DeclarativeEnvironment::initialize_binding(GlobalObject&
}
// 9.1.1.1.5 SetMutableBinding ( N, V, S ), https://tc39.es/ecma262/#sec-declarative-environment-records-setmutablebinding-n-v-s
void DeclarativeEnvironment::set_mutable_binding(GlobalObject& global_object, FlyString const& name, Value value, bool strict)
ThrowCompletionOr<void> DeclarativeEnvironment::set_mutable_binding(GlobalObject& global_object, FlyString const& name, Value value, bool strict)
{
// 1. If envRec does not have a binding for N, then
auto it = m_names.find(name);
if (it == m_names.end()) {
if (strict) {
global_object.vm().throw_exception<ReferenceError>(global_object, ErrorType::UnknownIdentifier, name);
return;
}
(void)create_mutable_binding(global_object, name, true);
(void)initialize_binding(global_object, name, value);
return;
// a. If S is true, throw a ReferenceError exception.
if (strict)
return vm().throw_completion<ReferenceError>(global_object, ErrorType::UnknownIdentifier, name);
// b. Perform envRec.CreateMutableBinding(N, true).
MUST(create_mutable_binding(global_object, name, true));
// c. Perform envRec.InitializeBinding(N, V).
MUST(initialize_binding(global_object, name, value));
// d. Return NormalCompletion(empty).
return {};
}
set_mutable_binding_direct(global_object, it->value, value, strict);
// 2-5. (extracted into a non-standard function below)
TRY(set_mutable_binding_direct(global_object, it->value, value, strict));
// 6. Return NormalCompletion(empty).
return {};
}
void DeclarativeEnvironment::set_mutable_binding_direct(GlobalObject& global_object, size_t index, Value value, bool strict)
ThrowCompletionOr<void> DeclarativeEnvironment::set_mutable_binding_direct(GlobalObject& global_object, size_t index, Value value, bool strict)
{
auto& binding = m_bindings[index];
if (binding.strict)
strict = true;
if (!binding.initialized) {
global_object.vm().throw_exception<ReferenceError>(global_object, ErrorType::BindingNotInitialized, name_from_index(index));
return;
}
if (!binding.initialized)
return vm().throw_completion<ReferenceError>(global_object, ErrorType::BindingNotInitialized, name_from_index(index));
if (binding.mutable_) {
binding.value = value;
} else {
if (strict) {
global_object.vm().throw_exception<TypeError>(global_object, ErrorType::InvalidAssignToConst);
}
if (strict)
return vm().throw_completion<TypeError>(global_object, ErrorType::InvalidAssignToConst);
}
return {};
}
// 9.1.1.1.6 GetBindingValue ( N, S ), https://tc39.es/ecma262/#sec-declarative-environment-records-getbindingvalue-n-s
@ -182,7 +191,7 @@ void DeclarativeEnvironment::initialize_or_set_mutable_binding(Badge<ScopeNode>,
if (!binding.initialized)
MUST(initialize_binding(global_object, name, value));
else
set_mutable_binding(global_object, name, value, false);
MUST(set_mutable_binding(global_object, name, value, false));
}
Vector<String> DeclarativeEnvironment::bindings() const