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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_ObservableArrayProxyHandler_h
#define mozilla_dom_ObservableArrayProxyHandler_h
#include "js/TypeDecls.h"
#include "js/Wrapper.h"
namespace mozilla::dom {
/**
* Proxy handler for observable array exotic object.
*
* The indexed properties are stored in the backing list object in reserved slot
* of the proxy object with special treatment intact.
*
* The additional properties are stored in the proxy target object.
*/
class ObservableArrayProxyHandler : public js::ForwardingProxyHandler {
public:
explicit constexpr ObservableArrayProxyHandler()
: js::ForwardingProxyHandler(&family) {}
// Implementations of methods that can be implemented in terms of
// other lower-level methods.
bool defineProperty(JSContext* aCx, JS::Handle<JSObject*> aProxy,
JS::Handle<JS::PropertyKey> aId,
JS::Handle<JS::PropertyDescriptor> aDesc,
JS::ObjectOpResult& aResult) const override;
bool delete_(JSContext* aCx, JS::Handle<JSObject*> aProxy,
JS::Handle<JS::PropertyKey> aId,
JS::ObjectOpResult& aResult) const override;
bool get(JSContext* aCx, JS::Handle<JSObject*> aProxy,
JS::Handle<JS::Value> aReceiver, JS::Handle<JS::PropertyKey> aId,
JS::MutableHandle<JS::Value> aVp) const override;
bool getOwnPropertyDescriptor(
JSContext* aCx, JS::Handle<JSObject*> aProxy,
JS::Handle<JS::PropertyKey> aId,
JS::MutableHandle<Maybe<JS::PropertyDescriptor>> aDesc) const override;
bool has(JSContext* aCx, JS::Handle<JSObject*> aProxy,
JS::Handle<JS::PropertyKey> aId, bool* aBp) const override;
bool ownPropertyKeys(JSContext* aCx, JS::Handle<JSObject*> aProxy,
JS::MutableHandleVector<jsid> aProps) const override;
bool preventExtensions(JSContext* aCx, JS::Handle<JSObject*> aProxy,
JS::ObjectOpResult& aResult) const override;
bool set(JSContext* aCx, JS::Handle<JSObject*> aProxy,
JS::Handle<JS::PropertyKey> aId, JS::Handle<JS::Value> aV,
JS::Handle<JS::Value> aReceiver,
JS::ObjectOpResult& aResult) const override;
bool SetLength(JSContext* aCx, JS::Handle<JSObject*> aProxy,
uint32_t aLength) const;
static const char family;
protected:
bool GetBackingListObject(
JSContext* aCx, JS::Handle<JSObject*> aProxy,
JS::MutableHandle<JSObject*> aBackingListObject) const;
bool GetBackingListLength(JSContext* aCx, JS::Handle<JSObject*> aProxy,
uint32_t* aLength) const;
bool SetLength(JSContext* aCx, JS::Handle<JSObject*> aProxy,
JS::Handle<JSObject*> aBackingList, uint32_t aLength,
JS::ObjectOpResult& aResult) const;
bool SetLength(JSContext* aCx, JS::Handle<JSObject*> aProxy,
JS::Handle<JSObject*> aBackingList,
JS::Handle<JS::Value> aValue,
JS::ObjectOpResult& aResult) const;
// Hook for subclasses to invoke the setting the indexed value steps which
// would invoke DeleteAlgorithm/SetAlgorithm defined and implemented per
// interface. Returns false and throw exception on failure.
virtual bool SetIndexedValue(JSContext* aCx, JS::Handle<JSObject*> aProxy,
JS::Handle<JSObject*> aBackingList,
uint32_t aIndex, JS::Handle<JS::Value> aValue,
JS::ObjectOpResult& aResult) const = 0;
// Hook for subclasses to invoke the DeleteAlgorithm defined and implemented
// per interface. Returns false and throw exception on failure.
virtual bool OnDeleteItem(JSContext* aCx, JS::Handle<JSObject*> aProxy,
JS::Handle<JS::Value> aValue,
uint32_t aIndex) const = 0;
};
inline bool IsObservableArrayProxy(JSObject* obj) {
return js::IsProxy(obj) && js::GetProxyHandler(obj)->family() ==
&ObservableArrayProxyHandler::family;
}
inline const ObservableArrayProxyHandler* GetObservableArrayProxyHandler(
JSObject* obj) {
MOZ_ASSERT(IsObservableArrayProxy(obj));
return static_cast<const ObservableArrayProxyHandler*>(
js::GetProxyHandler(obj));
}
} // namespace mozilla::dom
#endif /* mozilla_dom_ObservableArrayProxyHandler_h */
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