mirror of
https://gitea.wildfiregames.com/0ad/0ad
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d92a2118b0
This ugprades 0 A.D. to the latest ESR at the moment of writing. Mostly straighforward API changes (see meta-Bug 1633145) - js::Class is merged with JSClass - JSNewArrayObject becomes JS::NewArrayObject - ArrayObject-functions are moved to a new public header Array.h - JSMSG error messages have again been changed, requiring some tweaks. - AutoValueArray becomes RootedBalueArray (Bug 1634435) - 'uneval' is behind a Realm flag (Bug 1565170), but no removal is planned in the short-term future. - Some minor GC API changes (Bugs 1569564 and 1633405) - Error reporting has had some tweaks, and error flags have been removed (Bug 1620583) - StructuredClone are now always thread-safe, simplifying an API change introduced in SM52 (Bug 1607791) Tested by: Stan, Freagarach, mammadori Closes #5861 Differential Revision: https://code.wildfiregames.com/D3168 This was SVN commit r24333.
133 lines
5 KiB
C++
133 lines
5 KiB
C++
/* Copyright (C) 2019 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef INCLUDED_JSI_GUIPROXY
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#define INCLUDED_JSI_GUIPROXY
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#include "scriptinterface/ScriptExtraHeaders.h"
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#include <utility>
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class ScriptInterface;
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// See JSI_GuiProxy below
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#if GCC_VERSION
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# pragma GCC diagnostic push
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# pragma GCC diagnostic ignored "-Wnon-virtual-dtor"
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#elif MSC_VERSION
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# pragma warning(push, 1)
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# pragma warning(disable: 4265)
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#endif
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/**
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* Handles the js interface with C++ GUI objects.
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* Proxy handlers must live for at least as long as the JS runtime
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* where a proxy object with that handler was created. The reason is that
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* proxy handlers are called during GC, such as on runtime destruction.
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* In practical terms, this means "just keep them static and store no data".
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*
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* GUI Objects only exist in C++ and have no JS-only properties.
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* As such, there is no "target" JS object that this proxy could point to,
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* and thus we should inherit from BaseProxyHandler and not js::Wrapper.
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*/
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template<typename GUIObjectType>
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class JSI_GUIProxy : public js::BaseProxyHandler
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{
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public:
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// Access the js::Class of the Proxy.
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static JSClass& ClassDefinition();
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// For convenience, this is the single instantiated JSI_GUIProxy.
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static JSI_GUIProxy& Singleton();
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static std::pair<const js::BaseProxyHandler*, void*> CreateData(ScriptInterface& scriptInterface);
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protected:
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// @param family can't be nullptr because that's used for some DOM object and it crashes.
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JSI_GUIProxy() : BaseProxyHandler(this, false, false) {};
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// Note: SM provides no virtual destructor for baseProxyHandler.
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// This also enforces making proxy handlers dataless static variables.
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~JSI_GUIProxy() {};
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// This handles returning function properties.
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// Specialize this.
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bool FuncGetter(JS::HandleObject proxy, const std::string& propName, JS::MutableHandleValue vp) const;
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protected:
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// BaseProxyHandler interface below
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// Handler for `object.x`
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virtual bool get(JSContext* cx, JS::HandleObject proxy, JS::HandleValue receiver, JS::HandleId id, JS::MutableHandleValue vp) const override final;
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// Handler for `object.x = y;`
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virtual bool set(JSContext* cx, JS::HandleObject proxy, JS::HandleId id, JS::HandleValue vp,
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JS::HandleValue receiver, JS::ObjectOpResult& result) const final;
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// Handler for `delete object.x;`
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virtual bool delete_(JSContext* cx, JS::HandleObject proxy, JS::HandleId id, JS::ObjectOpResult& result) const override final;
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// The following methods are not provided by BaseProxyHandler.
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// We provide defaults that do nothing (some raise JS exceptions).
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// The JS code will see undefined when querying a property descriptor.
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virtual bool getOwnPropertyDescriptor(JSContext* UNUSED(cx), JS::HandleObject UNUSED(proxy), JS::HandleId UNUSED(id),
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JS::MutableHandle<JS::PropertyDescriptor> UNUSED(desc)) const override
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{
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return true;
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}
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// Throw an exception is JS code attempts defining a property.
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virtual bool defineProperty(JSContext* UNUSED(cx), JS::HandleObject UNUSED(proxy), JS::HandleId UNUSED(id),
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JS::Handle<JS::PropertyDescriptor> UNUSED(desc), JS::ObjectOpResult& UNUSED(result)) const override
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{
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return false;
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}
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// No accessible properties.
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virtual bool ownPropertyKeys(JSContext* UNUSED(cx), JS::HandleObject UNUSED(proxy), JS::MutableHandleIdVector UNUSED(props)) const override
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{
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return true;
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}
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// Nothing to enumerate.
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virtual bool enumerate(JSContext* UNUSED(cx), JS::HandleObject UNUSED(proxy), JS::MutableHandleIdVector UNUSED(props)) const override
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{
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return true;
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}
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// Throw an exception is JS attempts to query the prototype.
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virtual bool getPrototypeIfOrdinary(JSContext* UNUSED(cx), JS::HandleObject UNUSED(proxy), bool* UNUSED(isOrdinary), JS::MutableHandleObject UNUSED(protop)) const override
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{
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return false;
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}
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// Throw an exception - no prototype to set.
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virtual bool setImmutablePrototype(JSContext* UNUSED(cx), JS::HandleObject UNUSED(proxy), bool* UNUSED(succeeded)) const override
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{
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return false;
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}
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// We are not extensible.
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virtual bool preventExtensions(JSContext* UNUSED(cx), JS::HandleObject UNUSED(proxy), JS::ObjectOpResult& UNUSED(result)) const override
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{
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return true;
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}
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virtual bool isExtensible(JSContext* UNUSED(cx), JS::HandleObject UNUSED(proxy), bool* extensible) const override
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{
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*extensible = false;
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return true;
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}
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};
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#if GCC_VERSION
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# pragma GCC diagnostic pop
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#elif MSC_VERSION
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# pragma warning(pop)
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#endif
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#endif // INCLUDED_JSI_GUIPROXY
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