140 lines
4 KiB
C++
140 lines
4 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/String.h>
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#include <LibJS/Runtime/Environment.h>
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#include <LibJS/Runtime/EnvironmentCoordinate.h>
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#include <LibJS/Runtime/ExecutionContext.h>
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#include <LibJS/Runtime/PropertyName.h>
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#include <LibJS/Runtime/Value.h>
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namespace JS {
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class Reference {
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public:
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enum class BaseType : u8 {
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Unresolvable,
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Value,
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Environment,
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};
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Reference() { }
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Reference(BaseType type, PropertyName name, bool strict)
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: m_base_type(type)
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, m_name(move(name))
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, m_strict(strict)
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{
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}
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Reference(Value base, PropertyName name, Value this_value, bool strict = false)
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: m_base_type(BaseType::Value)
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, m_base_value(base)
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, m_name(move(name))
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, m_this_value(this_value)
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, m_strict(strict)
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{
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if (base.is_nullish()) {
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m_base_type = BaseType::Unresolvable;
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m_base_value = {};
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m_this_value = {};
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m_name = {};
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}
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}
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Reference(Environment& base, FlyString referenced_name, bool strict = false, Optional<EnvironmentCoordinate> environment_coordinate = {})
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: m_base_type(BaseType::Environment)
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, m_base_environment(&base)
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, m_name(move(referenced_name))
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, m_strict(strict)
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, m_environment_coordinate(move(environment_coordinate))
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{
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}
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Value base() const
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{
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VERIFY(m_base_type == BaseType::Value);
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return m_base_value;
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}
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Environment& base_environment() const
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{
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VERIFY(m_base_type == BaseType::Environment);
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return *m_base_environment;
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}
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PropertyName const& name() const { return m_name; }
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bool is_strict() const { return m_strict; }
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// 6.2.4.2 IsUnresolvableReference ( V ), https://tc39.es/ecma262/#sec-isunresolvablereference
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bool is_unresolvable() const { return m_base_type == BaseType::Unresolvable; }
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// 6.2.4.1 IsPropertyReference ( V ), https://tc39.es/ecma262/#sec-ispropertyreference
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bool is_property_reference() const
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{
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if (is_unresolvable())
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return false;
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if (m_base_type == BaseType::Environment)
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return false;
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if (m_base_value.is_boolean() || m_base_value.is_string() || m_base_value.is_symbol() || m_base_value.is_bigint() || m_base_value.is_number() || m_base_value.is_object())
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return true;
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return false;
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}
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// 6.2.4.7 GetThisValue ( V ), https://tc39.es/ecma262/#sec-getthisvalue
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Value get_this_value() const
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{
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VERIFY(is_property_reference());
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if (is_super_reference())
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return m_this_value;
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return m_base_value;
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}
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// 6.2.4.3 IsSuperReference ( V ), https://tc39.es/ecma262/#sec-issuperreference
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bool is_super_reference() const
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{
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return !m_this_value.is_empty();
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}
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// Note: Non-standard helper.
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bool is_environment_reference() const
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{
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return m_base_type == BaseType::Environment;
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}
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void initialize_referenced_binding(GlobalObject& global_object, Value value) const
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{
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VERIFY(!is_unresolvable());
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VERIFY(m_base_type == BaseType::Environment);
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(void)m_base_environment->initialize_binding(global_object, m_name.as_string(), value);
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}
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void put_value(GlobalObject&, Value);
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Value get_value(GlobalObject&) const;
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bool delete_(GlobalObject&);
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String to_string() const;
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bool is_valid_reference() const { return m_name.is_valid(); }
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Optional<EnvironmentCoordinate> environment_coordinate() const { return m_environment_coordinate; }
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private:
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void throw_reference_error(GlobalObject&) const;
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BaseType m_base_type { BaseType::Unresolvable };
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union {
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Value m_base_value {};
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mutable Environment* m_base_environment;
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};
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PropertyName m_name;
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Value m_this_value;
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bool m_strict { false };
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Optional<EnvironmentCoordinate> m_environment_coordinate;
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};
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}
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