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LibJS: Make DeclarativeEnvironment based on bindings instead of indices

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This will allow other environments which extend DeclarativeEnvironment
to provide their own custom bindings.
This commit is contained in:
davidot 2022-09-01 23:22:17 +02:00 • committed by Linus Groh
parent faf1430ce4
commit 2484bbc4e0
2 changed files with 73 additions and 35 deletions
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47
Userland/Libraries/LibJS/Runtime/DeclarativeEnvironment.h
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@ -54,9 +54,13 @@ public:
return names;
}
ThrowCompletionOr<void> initialize_binding_direct(VM&, size_t index, Value);
ThrowCompletionOr<Value> get_binding_value_direct(VM&, size_t index, bool strict);
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();
@ -65,10 +69,37 @@ protected:
virtual void visit_edges(Visitor&) override;
private:
virtual bool is_declarative_environment() const override { return true; }
class BindingAndIndex {
public:
Binding& binding()
{
if (m_referenced_binding)
return *m_referenced_binding;
return m_temporary_binding;
}
Optional<size_t> find_binding_index(FlyString const& name) const
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;
@ -76,9 +107,13 @@ private:
if (it == m_bindings.end())
return {};
return it.index();
return BindingAndIndex { const_cast<Binding*>(&(*it)), it.index() };
}
private:
virtual bool is_declarative_environment() const override { return true; }
Vector<Binding> m_bindings;
};