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LibJS: Add ModuleEnvironment

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davidot 2022-01-16 23:30:15 +01:00 • committed by Linus Groh
parent 12c2f30c54
commit 0cdbc03de0
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Userland/Libraries/LibJS/Runtime/ModuleEnvironment.h Normal file
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/*
* Copyright (c) 2022, David Tuin <davidot@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibJS/Module.h>
#include <LibJS/Runtime/DeclarativeEnvironment.h>
#include <LibJS/Runtime/Environment.h>
namespace JS {
// 9.1.1.5 Module Environment Records, https://tc39.es/ecma262/#sec-module-environment-records
class ModuleEnvironment final : public DeclarativeEnvironment {
JS_ENVIRONMENT(ModuleEnvironment, DeclarativeEnvironment);
public:
ModuleEnvironment(Environment* outer_environment);
// Note: Module Environment Records support all of the declarative Environment Record methods listed
// in Table 18 and share the same specifications for all of those methods except for
// GetBindingValue, DeleteBinding, HasThisBinding and GetThisBinding.
// In addition, module Environment Records support the methods listed in Table 24.
virtual ThrowCompletionOr<Value> get_binding_value(GlobalObject&, FlyString const& name, bool strict) override;
virtual ThrowCompletionOr<bool> delete_binding(GlobalObject&, FlyString const& name) override;
virtual bool has_this_binding() const final { return true; }
virtual ThrowCompletionOr<Value> get_this_binding(GlobalObject&) const final;
ThrowCompletionOr<void> create_import_binding(FlyString name, Module* module, FlyString binding_name);
// Note: Although the spec does not explicitly say this we also have to implement HasBinding as
// the HasBinding method of Declarative Environment records states:
// "It determines if the argument identifier is one of the identifiers bound by the record"
// And this means that we have to include the indirect bindings of a Module Environment.
virtual ThrowCompletionOr<bool> has_binding(FlyString const& name, Optional<size_t>* = nullptr) const override;
private:
struct IndirectBinding {
FlyString name;
Module* module;
FlyString binding_name;
};
IndirectBinding const* get_indirect_binding(FlyString const& name) const;
// FIXME: Since we always access this via the name this could be a map.
Vector<IndirectBinding> m_indirect_bindings;
};
}