8527f00065
This is required by the specification and will be used for the $262.detachArrayBuffer method in test262.
50 lines
1.5 KiB
C++
50 lines
1.5 KiB
C++
/*
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* Copyright (c) 2020, Linus Groh <linusg@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/ByteBuffer.h>
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#include <AK/Variant.h>
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#include <LibJS/Runtime/Object.h>
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namespace JS {
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class ArrayBuffer : public Object {
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JS_OBJECT(ArrayBuffer, Object);
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public:
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static ArrayBuffer* create(GlobalObject&, size_t);
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static ArrayBuffer* create(GlobalObject&, ByteBuffer*);
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ArrayBuffer(size_t, Object& prototype);
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ArrayBuffer(ByteBuffer* buffer, Object& prototype);
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virtual ~ArrayBuffer() override;
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size_t byte_length() const { return buffer_impl().size(); }
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ByteBuffer& buffer() { return buffer_impl(); }
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const ByteBuffer& buffer() const { return buffer_impl(); }
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Value detach_key() const { return m_detach_key; }
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void detach_buffer() { m_buffer = Empty {}; }
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bool is_detached() const { return m_buffer.has<Empty>(); }
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private:
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ByteBuffer& buffer_impl()
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{
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ByteBuffer* ptr { nullptr };
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m_buffer.visit([&](Empty) { VERIFY_NOT_REACHED(); }, [&](auto* pointer) { ptr = pointer; }, [&](auto& value) { ptr = &value; });
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return *ptr;
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}
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const ByteBuffer& buffer_impl() const { return const_cast<ArrayBuffer*>(this)->buffer_impl(); }
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Variant<Empty, ByteBuffer, ByteBuffer*> m_buffer;
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// The various detach related members of ArrayBuffer are not used by any ECMA262 functionality,
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// but are required to be available for the use of various harnesses like the Test262 test runner.
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Value m_detach_key;
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};
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}
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