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/*
* Copyright (C) 2009 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "DefinePropertyAttributes.h"
#include "JSCJSValue.h"
#include "PropertySlot.h"
namespace JSC {
class GetterSetter;
class PropertyDescriptor {
public:
PropertyDescriptor()
: m_attributes(defaultAttributes)
, m_seenAttributes(0)
{
}
PropertyDescriptor(JSValue value, unsigned attributes)
: m_value(value)
, m_attributes(attributes)
, m_seenAttributes(EnumerablePresent | ConfigurablePresent | WritablePresent)
{
ASSERT(m_value);
ASSERT(!m_value.isGetterSetter());
ASSERT(!m_value.isCustomGetterSetter());
}
JS_EXPORT_PRIVATE bool writable() const;
JS_EXPORT_PRIVATE bool enumerable() const;
JS_EXPORT_PRIVATE bool configurable() const;
JS_EXPORT_PRIVATE bool isDataDescriptor() const;
bool isGenericDescriptor() const;
JS_EXPORT_PRIVATE bool isAccessorDescriptor() const;
unsigned attributes() const { return m_attributes; }
JSValue value() const { return m_value; }
GetterSetter* slowGetterSetter(JSGlobalObject*) const; // Be aware that this will lazily allocate a GetterSetter object. It's much better to use getter() and setter() individually if possible.
JS_EXPORT_PRIVATE JSValue getter() const;
JS_EXPORT_PRIVATE JSValue setter() const;
JSObject* getterObject() const;
JSObject* setterObject() const;
JS_EXPORT_PRIVATE void setUndefined();
JS_EXPORT_PRIVATE void setDescriptor(JSValue, unsigned attributes);
JS_EXPORT_PRIVATE void setAccessorDescriptor(unsigned attributes);
JS_EXPORT_PRIVATE void setAccessorDescriptor(GetterSetter* accessor, unsigned attributes);
JS_EXPORT_PRIVATE void setWritable(bool);
JS_EXPORT_PRIVATE void setEnumerable(bool);
JS_EXPORT_PRIVATE void setConfigurable(bool);
void setValue(JSValue value) { m_value = value; }
JS_EXPORT_PRIVATE void setSetter(JSValue);
JS_EXPORT_PRIVATE void setGetter(JSValue);
bool isEmpty() const { return !(m_value || m_getter || m_setter || m_seenAttributes); }
bool writablePresent() const { return m_seenAttributes & WritablePresent; }
bool enumerablePresent() const { return m_seenAttributes & EnumerablePresent; }
bool configurablePresent() const { return m_seenAttributes & ConfigurablePresent; }
bool setterPresent() const { return !!m_setter; }
bool getterPresent() const { return !!m_getter; }
bool equalTo(JSGlobalObject*, const PropertyDescriptor& other) const;
bool attributesEqual(const PropertyDescriptor& other) const;
unsigned attributesOverridingCurrent(const PropertyDescriptor& current) const;
JS_EXPORT_PRIVATE bool setPropertySlot(JSGlobalObject*, PropertyName, const PropertySlot&);
private:
static constexpr unsigned defaultAttributes = PropertyAttribute::DontDelete | PropertyAttribute::DontEnum | PropertyAttribute::ReadOnly;
bool operator==(const PropertyDescriptor&) { return false; }
enum { WritablePresent = 1, EnumerablePresent = 2, ConfigurablePresent = 4};
// May be a getter/setter
JSValue m_value;
JSValue m_getter;
JSValue m_setter;
unsigned m_attributes;
unsigned m_seenAttributes;
};
inline PropertyDescriptor toPropertyDescriptor(JSValue value, JSValue getter, JSValue setter, DefinePropertyAttributes attributes)
{
// We assume that validation is already done.
PropertyDescriptor desc;
if (std::optional<bool> enumerable = attributes.enumerable())
desc.setEnumerable(enumerable.value());
if (std::optional<bool> configurable = attributes.configurable())
desc.setConfigurable(configurable.value());
if (attributes.hasValue())
desc.setValue(value);
if (std::optional<bool> writable = attributes.writable())
desc.setWritable(writable.value());
if (attributes.hasGet())
desc.setGetter(getter);
if (attributes.hasSet())
desc.setSetter(setter);
return desc;
}
}
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