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