acda12597a
This is an editorial change in the ECMA-262 spec. See: https://github.com/tc39/ecma262/commit/3246553
87 lines
3.3 KiB
C++
87 lines
3.3 KiB
C++
/*
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* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/FlyString.h>
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#include <AK/HashMap.h>
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#include <LibJS/Runtime/Completion.h>
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#include <LibJS/Runtime/Environment.h>
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#include <LibJS/Runtime/Value.h>
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namespace JS {
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class DeclarativeEnvironment : public Environment {
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JS_ENVIRONMENT(DeclarativeEnvironment, Environment);
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struct Binding {
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FlyString name;
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Value value;
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bool strict { false };
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bool mutable_ { false };
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bool can_be_deleted { false };
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bool initialized { false };
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};
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public:
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static DeclarativeEnvironment* create_for_per_iteration_bindings(Badge<ForStatement>, DeclarativeEnvironment& other, size_t bindings_size);
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DeclarativeEnvironment();
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explicit DeclarativeEnvironment(Environment* parent_environment);
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explicit DeclarativeEnvironment(Environment* parent_environment, Span<Binding const> bindings);
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virtual ~DeclarativeEnvironment() override = default;
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virtual ThrowCompletionOr<bool> has_binding(FlyString const& name, Optional<size_t>* = nullptr) const override;
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virtual ThrowCompletionOr<void> create_mutable_binding(GlobalObject&, FlyString const& name, bool can_be_deleted) override;
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virtual ThrowCompletionOr<void> create_immutable_binding(GlobalObject&, FlyString const& name, bool strict) override;
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virtual ThrowCompletionOr<void> initialize_binding(GlobalObject&, FlyString const& name, Value) override;
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virtual ThrowCompletionOr<void> set_mutable_binding(GlobalObject&, FlyString const& name, Value, bool strict) override;
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virtual ThrowCompletionOr<Value> get_binding_value(GlobalObject&, FlyString const& name, bool strict) override;
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virtual ThrowCompletionOr<bool> delete_binding(GlobalObject&, FlyString const& name) override;
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void initialize_or_set_mutable_binding(Badge<ScopeNode>, GlobalObject& global_object, FlyString const& name, Value value);
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ThrowCompletionOr<void> initialize_or_set_mutable_binding(GlobalObject& global_object, FlyString const& name, Value value);
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// This is not a method defined in the spec! Do not use this in any LibJS (or other spec related) code.
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[[nodiscard]] Vector<FlyString> bindings() const
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{
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Vector<FlyString> names;
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names.ensure_capacity(m_bindings.size());
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for (auto const& binding : m_bindings)
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names.unchecked_append(binding.name);
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return names;
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}
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ThrowCompletionOr<void> initialize_binding_direct(GlobalObject&, size_t index, Value);
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ThrowCompletionOr<Value> get_binding_value_direct(GlobalObject&, size_t index, bool strict);
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ThrowCompletionOr<void> set_mutable_binding_direct(GlobalObject&, size_t index, Value, bool strict);
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protected:
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virtual void visit_edges(Visitor&) override;
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private:
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virtual bool is_declarative_environment() const override { return true; }
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Optional<size_t> find_binding_index(FlyString const& name) const
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{
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auto it = m_bindings.find_if([&](auto const& binding) {
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return binding.name == name;
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});
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if (it == m_bindings.end())
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return {};
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return it.index();
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}
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Vector<Binding> m_bindings;
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};
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template<>
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inline bool Environment::fast_is<DeclarativeEnvironment>() const { return is_declarative_environment(); }
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}
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