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LibJS: Add spec comments to remaining GlobalEnvironment methods
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1 changed files with 80 additions and 4 deletions
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@ -160,96 +160,172 @@ ThrowCompletionOr<bool> GlobalEnvironment::delete_binding(GlobalObject& global_o
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// 9.1.1.4.12 HasVarDeclaration ( N ), https://tc39.es/ecma262/#sec-hasvardeclaration
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bool GlobalEnvironment::has_var_declaration(FlyString const& name) const
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{
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// 1. Let varDeclaredNames be envRec.[[VarNames]].
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// 2. If varDeclaredNames contains N, return true.
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// 3. Return false.
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return m_var_names.contains_slow(name);
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}
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// 9.1.1.4.13 HasLexicalDeclaration ( N ), https://tc39.es/ecma262/#sec-haslexicaldeclaration
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bool GlobalEnvironment::has_lexical_declaration(FlyString const& name) const
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{
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// 1. Let DclRec be envRec.[[DeclarativeRecord]].
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// 2. Return DclRec.HasBinding(N).
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return MUST(m_declarative_record->has_binding(name));
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}
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// 9.1.1.4.14 HasRestrictedGlobalProperty ( N ), https://tc39.es/ecma262/#sec-hasrestrictedglobalproperty
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bool GlobalEnvironment::has_restricted_global_property(FlyString const& name) const
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{
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// 1. Let ObjRec be envRec.[[ObjectRecord]].
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// 2. Let globalObject be ObjRec.[[BindingObject]].
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auto& global_object = m_object_record->binding_object();
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// 3. Let existingProp be ? globalObject.[[GetOwnProperty]](N).
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auto existing_prop = TRY_OR_DISCARD(global_object.internal_get_own_property(name));
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// 4. If existingProp is undefined, return false.
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if (!existing_prop.has_value())
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return false;
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// 5. If existingProp.[[Configurable]] is true, return false.
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if (*existing_prop->configurable)
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return false;
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// 6. Return true.
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return true;
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}
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// 9.1.1.4.15 CanDeclareGlobalVar ( N ), https://tc39.es/ecma262/#sec-candeclareglobalvar
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bool GlobalEnvironment::can_declare_global_var(FlyString const& name) const
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{
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// 1. Let ObjRec be envRec.[[ObjectRecord]].
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// 2. Let globalObject be ObjRec.[[BindingObject]].
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auto& global_object = m_object_record->binding_object();
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// 3. Let hasProperty be ? HasOwnProperty(globalObject, N).
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bool has_property = TRY_OR_DISCARD(global_object.has_own_property(name));
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// 4. If hasProperty is true, return true.
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if (has_property)
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return true;
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// 5. Return ? IsExtensible(globalObject).
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return TRY_OR_DISCARD(global_object.is_extensible());
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}
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// 9.1.1.4.16 CanDeclareGlobalFunction ( N ), https://tc39.es/ecma262/#sec-candeclareglobalfunction
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bool GlobalEnvironment::can_declare_global_function(FlyString const& name) const
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{
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// 1. Let ObjRec be envRec.[[ObjectRecord]].
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// 2. Let globalObject be ObjRec.[[BindingObject]].
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auto& global_object = m_object_record->binding_object();
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// 3. Let existingProp be ? globalObject.[[GetOwnProperty]](N).
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auto existing_prop = TRY_OR_DISCARD(global_object.internal_get_own_property(name));
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// 4. If existingProp is undefined, return ? IsExtensible(globalObject).
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if (!existing_prop.has_value())
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return TRY_OR_DISCARD(global_object.is_extensible());
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// 5. If existingProp.[[Configurable]] is true, return true.
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if (*existing_prop->configurable)
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return true;
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// 6. If IsDataDescriptor(existingProp) is true and existingProp has attribute values { [[Writable]]: true, [[Enumerable]]: true }, return true.
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if (existing_prop->is_data_descriptor() && *existing_prop->writable && *existing_prop->enumerable)
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return true;
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// 7. Return false.
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return false;
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}
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// 9.1.1.4.17 CreateGlobalVarBinding ( N, D ), https://tc39.es/ecma262/#sec-createglobalvarbinding
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void GlobalEnvironment::create_global_var_binding(FlyString const& name, bool can_be_deleted)
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{
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// 1. Let ObjRec be envRec.[[ObjectRecord]].
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// 2. Let globalObject be ObjRec.[[BindingObject]].
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auto& global_object = m_object_record->binding_object();
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// 3. Let hasProperty be ? HasOwnProperty(globalObject, N).
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auto has_property_or_error = global_object.has_own_property(name);
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if (has_property_or_error.is_error())
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return;
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auto has_property = has_property_or_error.release_value();
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// 4. Let extensible be ? IsExtensible(globalObject).
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auto extensible_or_error = global_object.is_extensible();
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if (extensible_or_error.is_error())
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return;
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auto extensible = extensible_or_error.release_value();
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// 5. If hasProperty is false and extensible is true, then
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if (!has_property && extensible) {
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// a. Perform ? ObjRec.CreateMutableBinding(N, D).
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auto result = m_object_record->create_mutable_binding(m_object_record->global_object(), name, can_be_deleted);
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if (result.is_error())
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return;
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// b. Perform ? ObjRec.InitializeBinding(N, undefined).
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result = m_object_record->initialize_binding(m_object_record->global_object(), name, js_undefined());
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if (result.is_error())
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return;
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}
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if (!m_var_names.contains_slow(name))
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// 6. Let varDeclaredNames be envRec.[[VarNames]].
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// 7. If varDeclaredNames does not contain N, then
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if (!m_var_names.contains_slow(name)) {
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// a. Append N to varDeclaredNames.
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m_var_names.append(name);
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}
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// 8. Return NormalCompletion(empty).
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}
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// 9.1.1.4.18 CreateGlobalFunctionBinding ( N, V, D ), https://tc39.es/ecma262/#sec-createglobalfunctionbinding
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void GlobalEnvironment::create_global_function_binding(FlyString const& name, Value value, bool can_be_deleted)
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{
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// 1. Let ObjRec be envRec.[[ObjectRecord]].
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// 2. Let globalObject be ObjRec.[[BindingObject]].
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auto& global_object = m_object_record->binding_object();
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// 3. Let existingProp be ? globalObject.[[GetOwnProperty]](N).
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auto existing_prop_or_error = global_object.internal_get_own_property(name);
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if (existing_prop_or_error.is_error())
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return;
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auto existing_prop = existing_prop_or_error.release_value();
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PropertyDescriptor desc;
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if (!existing_prop.has_value() || *existing_prop->configurable)
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// 4. If existingProp is undefined or existingProp.[[Configurable]] is true, then
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if (!existing_prop.has_value() || *existing_prop->configurable) {
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// a. Let desc be the PropertyDescriptor { [[Value]]: V, [[Writable]]: true, [[Enumerable]]: true, [[Configurable]]: D }.
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desc = { .value = value, .writable = true, .enumerable = true, .configurable = can_be_deleted };
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else
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}
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// 5. Else,
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else {
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// a. Let desc be the PropertyDescriptor { [[Value]]: V }.
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desc = { .value = value };
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}
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// 6. Perform ? DefinePropertyOrThrow(globalObject, N, desc).
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auto result_or_error = global_object.define_property_or_throw(name, desc);
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if (result_or_error.is_error())
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return;
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// 7. Perform ? Set(globalObject, N, V, false).
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result_or_error = global_object.set(name, value, Object::ShouldThrowExceptions::Yes);
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if (result_or_error.is_error())
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return;
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if (!m_var_names.contains_slow(name))
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// 8. Let varDeclaredNames be envRec.[[VarNames]].
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// 9. If varDeclaredNames does not contain N, then
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if (!m_var_names.contains_slow(name)) {
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// a. Append N to varDeclaredNames.
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m_var_names.append(name);
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}
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// 10. Return NormalCompletion(empty).
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}
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}
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