mirror of
https://github.com/RGBCube/serenity
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107 lines
3.8 KiB
C++
107 lines
3.8 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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/Cell.h>
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#include <LibJS/Runtime/Value.h>
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namespace JS {
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struct Variable {
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Value value;
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DeclarationKind declaration_kind;
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};
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class LexicalEnvironment final : public Cell {
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public:
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enum class ThisBindingStatus {
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Lexical,
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Initialized,
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Uninitialized,
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};
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enum class EnvironmentRecordType {
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Declarative,
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Function,
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Global,
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Object,
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Module,
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};
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LexicalEnvironment();
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LexicalEnvironment(EnvironmentRecordType);
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LexicalEnvironment(HashMap<FlyString, Variable> variables, LexicalEnvironment* parent);
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LexicalEnvironment(HashMap<FlyString, Variable> variables, LexicalEnvironment* parent, EnvironmentRecordType);
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virtual ~LexicalEnvironment() override;
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LexicalEnvironment* parent() const { return m_parent; }
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Optional<Variable> get(const FlyString&) const;
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void set(GlobalObject&, const FlyString&, Variable);
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void clear();
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const HashMap<FlyString, Variable>& variables() const { return m_variables; }
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void set_home_object(Value object) { m_home_object = object; }
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bool has_super_binding() const;
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Value get_super_base();
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bool has_this_binding() const;
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ThisBindingStatus this_binding_status() const { return m_this_binding_status; }
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Value get_this_binding(GlobalObject&) const;
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void bind_this_value(GlobalObject&, Value this_value);
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// Not a standard operation.
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void replace_this_binding(Value this_value) { m_this_value = this_value; }
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Value new_target() const { return m_new_target; };
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void set_new_target(Value new_target) { m_new_target = new_target; }
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Function* current_function() const { return m_current_function; }
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void set_current_function(Function& function) { m_current_function = &function; }
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EnvironmentRecordType type() const { return m_environment_record_type; }
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private:
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virtual const char* class_name() const override { return "LexicalEnvironment"; }
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virtual void visit_children(Visitor&) override;
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LexicalEnvironment* m_parent { nullptr };
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HashMap<FlyString, Variable> m_variables;
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EnvironmentRecordType m_environment_record_type = EnvironmentRecordType::Declarative;
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ThisBindingStatus m_this_binding_status = ThisBindingStatus::Uninitialized;
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Value m_home_object;
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Value m_this_value;
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Value m_new_target;
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// Corresponds to [[FunctionObject]]
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Function* m_current_function { nullptr };
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};
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}
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