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0fc67ffd62
Before this we attempted to hack around this by only overriding has_binding. However this did not cover all cases, for example when assigning to variables before their declaration it didn't throw. By using the new find_binding_and_index virtual method we can just pretend the indirect bindings are real. Since indirect binding do come from a normal environment we need to ensure you cannot modify the binding and that properties like mutable are false as expected by the spec for such an indirect binding.
46 lines
1.8 KiB
C++
46 lines
1.8 KiB
C++
/*
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* Copyright (c) 2022, David Tuin <davidot@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 <LibJS/Module.h>
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#include <LibJS/Runtime/DeclarativeEnvironment.h>
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#include <LibJS/Runtime/Environment.h>
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namespace JS {
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// 9.1.1.5 Module Environment Records, https://tc39.es/ecma262/#sec-module-environment-records
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class ModuleEnvironment final : public DeclarativeEnvironment {
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JS_ENVIRONMENT(ModuleEnvironment, DeclarativeEnvironment);
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public:
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// Note: Module Environment Records support all of the declarative Environment Record methods listed
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// in Table 18 and share the same specifications for all of those methods except for
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// GetBindingValue, DeleteBinding, HasThisBinding and GetThisBinding.
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// In addition, module Environment Records support the methods listed in Table 24.
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virtual ThrowCompletionOr<Value> get_binding_value(VM&, FlyString const& name, bool strict) override;
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virtual ThrowCompletionOr<bool> delete_binding(VM&, FlyString const& name) override;
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virtual bool has_this_binding() const final { return true; }
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virtual ThrowCompletionOr<Value> get_this_binding(VM&) const final;
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ThrowCompletionOr<void> create_import_binding(FlyString name, Module* module, FlyString binding_name);
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private:
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explicit ModuleEnvironment(Environment* outer_environment);
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struct IndirectBinding {
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FlyString name;
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Module* module;
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FlyString binding_name;
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};
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IndirectBinding const* get_indirect_binding(FlyString const& name) const;
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virtual Optional<BindingAndIndex> find_binding_and_index(FlyString const& name) const override;
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// FIXME: Since we always access this via the name this could be a map.
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Vector<IndirectBinding> m_indirect_bindings;
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};
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}
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