leper
3648ba448d
Reviewed By: Itms Differential Revision: https://code.wildfiregames.com/D155 This was SVN commit r19339.
563 lines
20 KiB
C++
563 lines
20 KiB
C++
/* Copyright (C) 2017 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_SCRIPTINTERFACE
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#define INCLUDED_SCRIPTINTERFACE
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#include <boost/random/linear_congruential.hpp>
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#include "lib/file/vfs/vfs_path.h"
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#include "maths/Fixed.h"
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#include "ScriptTypes.h"
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#include "ps/Errors.h"
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ERROR_GROUP(Scripting);
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ERROR_TYPE(Scripting, SetupFailed);
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ERROR_SUBGROUP(Scripting, LoadFile);
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ERROR_TYPE(Scripting_LoadFile, OpenFailed);
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ERROR_TYPE(Scripting_LoadFile, EvalErrors);
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ERROR_TYPE(Scripting, ConversionFailed);
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ERROR_TYPE(Scripting, CallFunctionFailed);
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ERROR_TYPE(Scripting, RegisterFunctionFailed);
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ERROR_TYPE(Scripting, DefineConstantFailed);
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ERROR_TYPE(Scripting, CreateObjectFailed);
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ERROR_TYPE(Scripting, TypeDoesNotExist);
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ERROR_SUBGROUP(Scripting, DefineType);
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ERROR_TYPE(Scripting_DefineType, AlreadyExists);
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ERROR_TYPE(Scripting_DefineType, CreationFailed);
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// Set the maximum number of function arguments that can be handled
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// (This should be as small as possible (for compiler efficiency),
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// but as large as necessary for all wrapped functions)
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#define SCRIPT_INTERFACE_MAX_ARGS 8
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// TODO: what's a good default?
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#define DEFAULT_RUNTIME_SIZE 16 * 1024 * 1024
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#define DEFAULT_HEAP_GROWTH_BYTES_GCTRIGGER 2 * 1024 *1024
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struct ScriptInterface_impl;
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class ScriptRuntime;
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extern shared_ptr<ScriptRuntime> g_ScriptRuntime;
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/**
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* Abstraction around a SpiderMonkey JSContext.
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*
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* Thread-safety:
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* - May be used in non-main threads.
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* - Each ScriptInterface must be created, used, and destroyed, all in a single thread
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* (it must never be shared between threads).
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*/
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class ScriptInterface
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{
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NONCOPYABLE(ScriptInterface);
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public:
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/**
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* Returns a runtime, which can used to initialise any number of
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* ScriptInterfaces contexts. Values created in one context may be used
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* in any other context from the same runtime (but not any other runtime).
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* Each runtime should only ever be used on a single thread.
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* @param runtimeSize Maximum size in bytes of the new runtime
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*/
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static shared_ptr<ScriptRuntime> CreateRuntime(shared_ptr<ScriptRuntime> parentRuntime = shared_ptr<ScriptRuntime>(), int runtimeSize = DEFAULT_RUNTIME_SIZE,
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int heapGrowthBytesGCTrigger = DEFAULT_HEAP_GROWTH_BYTES_GCTRIGGER);
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/**
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* Constructor.
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* @param nativeScopeName Name of global object that functions (via RegisterFunction) will
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* be placed into, as a scoping mechanism; typically "Engine"
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* @param debugName Name of this interface for CScriptStats purposes.
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* @param runtime ScriptRuntime to use when initializing this interface.
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*/
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ScriptInterface(const char* nativeScopeName, const char* debugName, const shared_ptr<ScriptRuntime>& runtime);
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~ScriptInterface();
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struct CxPrivate
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{
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ScriptInterface* pScriptInterface; // the ScriptInterface object the current context belongs to
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void* pCBData; // meant to be used as the "this" object for callback functions
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} m_CxPrivate;
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void SetCallbackData(void* pCBData);
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static CxPrivate* GetScriptInterfaceAndCBData(JSContext* cx);
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JSContext* GetContext() const;
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JSRuntime* GetJSRuntime() const;
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shared_ptr<ScriptRuntime> GetRuntime() const;
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/**
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* Load global scripts that most script contexts need,
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* located in the /globalscripts directory. VFS must be initialized.
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*/
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bool LoadGlobalScripts();
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enum CACHED_VAL { CACHE_VECTOR2DPROTO, CACHE_VECTOR3DPROTO };
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JS::Value GetCachedValue(CACHED_VAL valueIdentifier) const;
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/**
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* Replace the default JS random number geenrator with a seeded, network-sync'd one.
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*/
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bool ReplaceNondeterministicRNG(boost::rand48& rng);
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/**
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* Call a constructor function, equivalent to JS "new ctor(arg)".
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* @param ctor An object that can be used as constructor
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* @param argv Constructor arguments
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* @param out The new object; On error an error message gets logged and out is Null (out.isNull() == true).
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*/
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void CallConstructor(JS::HandleValue ctor, JS::HandleValueArray argv, JS::MutableHandleValue out) const;
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JSObject* CreateCustomObject(const std::string & typeName) const;
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void DefineCustomObjectType(JSClass *clasp, JSNative constructor, uint minArgs, JSPropertySpec *ps, JSFunctionSpec *fs, JSPropertySpec *static_ps, JSFunctionSpec *static_fs);
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jsval GetGlobalObject();
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JSClass* GetGlobalClass();
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/**
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* Set the named property on the global object.
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* If @p replace is true, an existing property will be overwritten; otherwise attempts
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* to set an already-defined value will fail.
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*/
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template<typename T>
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bool SetGlobal(const char* name, const T& value, bool replace = false);
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/**
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* Set the named property on the given object.
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* Optionally makes it {ReadOnly, DontDelete, DontEnum}.
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*/
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template<typename T>
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bool SetProperty(JS::HandleValue obj, const char* name, const T& value, bool constant = false, bool enumerate = true);
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/**
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* Set the named property on the given object.
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* Optionally makes it {ReadOnly, DontDelete, DontEnum}.
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*/
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template<typename T>
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bool SetProperty(JS::HandleValue obj, const wchar_t* name, const T& value, bool constant = false, bool enumerate = true);
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/**
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* Set the integer-named property on the given object.
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* Optionally makes it {ReadOnly, DontDelete, DontEnum}.
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*/
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template<typename T>
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bool SetPropertyInt(JS::HandleValue obj, int name, const T& value, bool constant = false, bool enumerate = true);
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/**
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* Get the named property on the given object.
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*/
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template<typename T>
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bool GetProperty(JS::HandleValue obj, const char* name, T& out) const;
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/**
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* Get the named property of the given object.
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*/
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bool GetProperty(JS::HandleValue obj, const char* name, JS::MutableHandleValue out) const;
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bool GetProperty(JS::HandleValue obj, const char* name, JS::MutableHandleObject out) const;
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/**
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* Get the integer-named property on the given object.
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*/
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template<typename T>
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bool GetPropertyInt(JS::HandleValue obj, int name, T& out) const;
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/**
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* Get the named property of the given object.
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*/
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bool GetPropertyInt(JS::HandleValue obj, int name, JS::MutableHandleValue out) const;
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/**
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* Check the named property has been defined on the given object.
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*/
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bool HasProperty(JS::HandleValue obj, const char* name) const;
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bool EnumeratePropertyNamesWithPrefix(JS::HandleValue objVal, const char* prefix, std::vector<std::string>& out) const;
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bool SetPrototype(JS::HandleValue obj, JS::HandleValue proto);
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bool FreezeObject(JS::HandleValue objVal, bool deep) const;
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bool Eval(const char* code) const;
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template<typename CHAR> bool Eval(const CHAR* code, JS::MutableHandleValue out) const;
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template<typename T, typename CHAR> bool Eval(const CHAR* code, T& out) const;
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/**
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* Convert an object to a UTF-8 encoded string, either with JSON
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* (if pretty == true and there is no JSON error) or with toSource().
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*
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* We have to use a mutable handle because JS_Stringify requires that for unknown reasons.
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*/
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std::string ToString(JS::MutableHandleValue obj, bool pretty = false) const;
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/**
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* Parse a UTF-8-encoded JSON string. Returns the unmodified value on error
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* and prints an error message.
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* @return true on success; false otherwise
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*/
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bool ParseJSON(const std::string& string_utf8, JS::MutableHandleValue out) const;
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/**
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* Read a JSON file. Returns the unmodified value on error and prints an error message.
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*/
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void ReadJSONFile(const VfsPath& path, JS::MutableHandleValue out) const;
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/**
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* Stringify to a JSON string, UTF-8 encoded. Returns an empty string on error.
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*/
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std::string StringifyJSON(JS::MutableHandleValue obj, bool indent = true) const;
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/**
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* Report the given error message through the JS error reporting mechanism,
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* and throw a JS exception. (Callers can check IsPendingException, and must
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* return false in that case to propagate the exception.)
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*/
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void ReportError(const char* msg) const;
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/**
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* Load and execute the given script in a new function scope.
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* @param filename Name for debugging purposes (not used to load the file)
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* @param code JS code to execute
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* @return true on successful compilation and execution; false otherwise
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*/
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bool LoadScript(const VfsPath& filename, const std::string& code) const;
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/**
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* Load and execute the given script in the global scope.
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* @param filename Name for debugging purposes (not used to load the file)
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* @param code JS code to execute
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* @return true on successful compilation and execution; false otherwise
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*/
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bool LoadGlobalScript(const VfsPath& filename, const std::wstring& code) const;
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/**
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* Load and execute the given script in the global scope.
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* @return true on successful compilation and execution; false otherwise
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*/
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bool LoadGlobalScriptFile(const VfsPath& path) const;
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/**
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* Construct a new value (usable in this ScriptInterface's context) by cloning
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* a value from a different context.
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* Complex values (functions, XML, etc) won't be cloned correctly, but basic
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* types and cyclic references should be fine.
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*/
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JS::Value CloneValueFromOtherContext(ScriptInterface& otherContext, JS::HandleValue val);
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/**
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* Convert a jsval to a C++ type. (This might trigger GC.)
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*/
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template<typename T> static bool FromJSVal(JSContext* cx, const JS::HandleValue val, T& ret);
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/**
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* Convert a C++ type to a jsval. (This might trigger GC. The return
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* value must be rooted if you don't want it to be collected.)
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* NOTE: We are passing the JS::Value by reference instead of returning it by value.
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* The reason is a memory corruption problem that appears to be caused by a bug in Visual Studio.
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* Details here: http://www.wildfiregames.com/forum/index.php?showtopic=17289&p=285921
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*/
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template<typename T> static void ToJSVal(JSContext* cx, JS::MutableHandleValue ret, T const& val);
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/**
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* MaybeGC tries to determine whether garbage collection in cx's runtime would free up enough memory to be worth the amount of time it would take.
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* This calls JS_MaybeGC directly, which does not do incremental GC. Usually you should prefer MaybeIncrementalRuntimeGC.
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*/
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void MaybeGC();
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/**
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* Triggers a full non-incremental garbage collection immediately. That should only be required in special cases and normally
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* you should try to use MaybeIncrementalRuntimeGC instead.
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*/
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void ForceGC();
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/**
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* MathRandom (this function) calls the random number generator assigned to this ScriptInterface instance and
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* returns the generated number.
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* Math_random (with underscore, not this function) is a global function, but different random number generators can be
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* stored per ScriptInterface. It calls MathRandom of the current ScriptInterface instance.
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*/
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bool MathRandom(double& nbr);
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/**
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* Structured clones are a way to serialize 'simple' JS values into a buffer
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* that can safely be passed between contexts and runtimes and threads.
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* A StructuredClone can be stored and read multiple times if desired.
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* We wrap them in shared_ptr so memory management is automatic and
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* thread-safe.
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*/
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class StructuredClone
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{
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NONCOPYABLE(StructuredClone);
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public:
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StructuredClone();
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~StructuredClone();
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u64* m_Data;
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size_t m_Size;
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};
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shared_ptr<StructuredClone> WriteStructuredClone(JS::HandleValue v);
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void ReadStructuredClone(const shared_ptr<StructuredClone>& ptr, JS::MutableHandleValue ret);
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/**
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* Converts |a| if needed and assigns it to |handle|.
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* This is meant for use in other templates where we want to use the same code for JS::RootedValue&/JS::HandleValue and
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* other types. Note that functions are meant to take JS::HandleValue instead of JS::RootedValue&, but this implicit
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* conversion does not work for templates (exact type matches required for type deduction).
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* A similar functionality could also be implemented as a ToJSVal specialization. The current approach was preferred
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* because "conversions" from JS::HandleValue to JS::MutableHandleValue are unusual and should not happen "by accident".
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*/
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template <typename T>
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static void AssignOrToJSVal(JSContext* cx, JS::MutableHandleValue handle, const T& a);
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/**
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* The same as AssignOrToJSVal, but also allows JS::Value for T.
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* In most cases it's not safe to use the plain (unrooted) JS::Value type, but this can happen quite
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* easily with template functions. The idea is that the linker prints an error if AssignOrToJSVal is
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* used with JS::Value. If the specialization for JS::Value should be allowed, you can use this
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* "unrooted" version of AssignOrToJSVal.
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*/
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template <typename T>
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static void AssignOrToJSValUnrooted(JSContext* cx, JS::MutableHandleValue handle, const T& a)
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{
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AssignOrToJSVal(cx, handle, a);
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}
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/**
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* Converts |val| to T if needed or just returns it if it's a handle.
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* This is meant for use in other templates where we want to use the same code for JS::HandleValue and
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* other types.
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*/
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template <typename T>
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static T AssignOrFromJSVal(JSContext* cx, const JS::HandleValue& val, bool& ret);
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private:
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bool CallFunction_(JS::HandleValue val, const char* name, JS::HandleValueArray argv, JS::MutableHandleValue ret) const;
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bool Eval_(const char* code, JS::MutableHandleValue ret) const;
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bool Eval_(const wchar_t* code, JS::MutableHandleValue ret) const;
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bool SetGlobal_(const char* name, JS::HandleValue value, bool replace);
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bool SetProperty_(JS::HandleValue obj, const char* name, JS::HandleValue value, bool readonly, bool enumerate);
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bool SetProperty_(JS::HandleValue obj, const wchar_t* name, JS::HandleValue value, bool readonly, bool enumerate);
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bool SetPropertyInt_(JS::HandleValue obj, int name, JS::HandleValue value, bool readonly, bool enumerate);
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bool GetProperty_(JS::HandleValue obj, const char* name, JS::MutableHandleValue out) const;
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bool GetPropertyInt_(JS::HandleValue obj, int name, JS::MutableHandleValue value) const;
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static bool IsExceptionPending(JSContext* cx);
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static const JSClass* GetClass(JS::HandleObject obj);
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static void* GetPrivate(JS::HandleObject obj);
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struct CustomType
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{
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// TODO: Move assignment operator and move constructor only have to be
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// explicitly defined for Visual Studio. VS2013 is still behind on C++11 support
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// What's missing is what they call "Rvalue references v3.0", see
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// https://msdn.microsoft.com/en-us/library/hh567368.aspx#rvref
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CustomType() {}
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CustomType& operator=(CustomType&& other)
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{
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m_Prototype = std::move(other.m_Prototype);
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m_Class = std::move(other.m_Class);
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m_Constructor = std::move(other.m_Constructor);
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return *this;
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}
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CustomType(CustomType&& other)
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{
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m_Prototype = std::move(other.m_Prototype);
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m_Class = std::move(other.m_Class);
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m_Constructor = std::move(other.m_Constructor);
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}
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JS::PersistentRootedObject m_Prototype;
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JSClass* m_Class;
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JSNative m_Constructor;
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};
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void Register(const char* name, JSNative fptr, size_t nargs);
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// Take care to keep this declaration before heap rooted members. Destructors of heap rooted
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// members have to be called before the runtime destructor.
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std::unique_ptr<ScriptInterface_impl> m;
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boost::rand48* m_rng;
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std::map<std::string, CustomType> m_CustomObjectTypes;
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// The nasty macro/template bits are split into a separate file so you don't have to look at them
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public:
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#include "NativeWrapperDecls.h"
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// This declares:
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//
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// template <R, T0..., TR (*fptr) (void* cbdata, T0...)>
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// void RegisterFunction(const char* functionName);
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//
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// template <R, T0..., TR (*fptr) (void* cbdata, T0...)>
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// static JSNative call;
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//
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// template <R, T0..., JSClass*, TC, TR (TC:*fptr) (T0...)>
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// static JSNative callMethod;
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//
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// template <R, T0..., JSClass*, TC, TR (TC:*fptr) const (T0...)>
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// static JSNative callMethodConst;
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//
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// template <T0...>
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// static size_t nargs();
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//
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// template <R, T0...>
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// bool CallFunction(JS::HandleValue val, const char* name, R& ret, const T0&...) const;
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//
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// template <R, T0...>
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// bool CallFunction(JS::HandleValue val, const char* name, JS::Rooted<R>* ret, const T0&...) const;
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//
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// template <R, T0...>
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// bool CallFunction(JS::HandleValue val, const char* name, JS::MutableHandle<R> ret, const T0&...) const;
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//
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// template <T0...>
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// bool CallFunctionVoid(JS::HandleValue val, const char* name, const T0&...) const;
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};
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// Implement those declared functions
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#include "NativeWrapperDefns.h"
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template<typename T>
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inline void ScriptInterface::AssignOrToJSVal(JSContext* cx, JS::MutableHandleValue handle, const T& a)
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{
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ToJSVal(cx, handle, a);
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}
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template<>
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inline void ScriptInterface::AssignOrToJSVal<JS::PersistentRootedValue>(JSContext* UNUSED(cx), JS::MutableHandleValue handle, const JS::PersistentRootedValue& a)
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{
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handle.set(a);
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}
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template<>
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inline void ScriptInterface::AssignOrToJSVal<JS::RootedValue>(JSContext* UNUSED(cx), JS::MutableHandleValue handle, const JS::RootedValue& a)
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{
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handle.set(a);
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}
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template <>
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inline void ScriptInterface::AssignOrToJSVal<JS::HandleValue>(JSContext* UNUSED(cx), JS::MutableHandleValue handle, const JS::HandleValue& a)
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{
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handle.set(a);
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}
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template <>
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inline void ScriptInterface::AssignOrToJSValUnrooted<JS::Value>(JSContext* UNUSED(cx), JS::MutableHandleValue handle, const JS::Value& a)
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{
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handle.set(a);
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}
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template<typename T>
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inline T ScriptInterface::AssignOrFromJSVal(JSContext* cx, const JS::HandleValue& val, bool& ret)
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{
|
|
T retVal;
|
|
ret = FromJSVal(cx, val, retVal);
|
|
return retVal;
|
|
}
|
|
|
|
template<>
|
|
inline JS::HandleValue ScriptInterface::AssignOrFromJSVal<JS::HandleValue>(JSContext* UNUSED(cx), const JS::HandleValue& val, bool& ret)
|
|
{
|
|
ret = true;
|
|
return val;
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::SetGlobal(const char* name, const T& value, bool replace)
|
|
{
|
|
JSAutoRequest rq(GetContext());
|
|
JS::RootedValue val(GetContext());
|
|
AssignOrToJSVal(GetContext(), &val, value);
|
|
return SetGlobal_(name, val, replace);
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::SetProperty(JS::HandleValue obj, const char* name, const T& value, bool readonly, bool enumerate)
|
|
{
|
|
JSAutoRequest rq(GetContext());
|
|
JS::RootedValue val(GetContext());
|
|
AssignOrToJSVal(GetContext(), &val, value);
|
|
return SetProperty_(obj, name, val, readonly, enumerate);
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::SetProperty(JS::HandleValue obj, const wchar_t* name, const T& value, bool readonly, bool enumerate)
|
|
{
|
|
JSAutoRequest rq(GetContext());
|
|
JS::RootedValue val(GetContext());
|
|
AssignOrToJSVal(GetContext(), &val, value);
|
|
return SetProperty_(obj, name, val, readonly, enumerate);
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::SetPropertyInt(JS::HandleValue obj, int name, const T& value, bool readonly, bool enumerate)
|
|
{
|
|
JSAutoRequest rq(GetContext());
|
|
JS::RootedValue val(GetContext());
|
|
AssignOrToJSVal(GetContext(), &val, value);
|
|
return SetPropertyInt_(obj, name, val, readonly, enumerate);
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::GetProperty(JS::HandleValue obj, const char* name, T& out) const
|
|
{
|
|
JSContext* cx = GetContext();
|
|
JSAutoRequest rq(cx);
|
|
JS::RootedValue val(cx);
|
|
if (!GetProperty_(obj, name, &val))
|
|
return false;
|
|
return FromJSVal(cx, val, out);
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::GetPropertyInt(JS::HandleValue obj, int name, T& out) const
|
|
{
|
|
JSAutoRequest rq(GetContext());
|
|
JS::RootedValue val(GetContext());
|
|
if (!GetPropertyInt_(obj, name, &val))
|
|
return false;
|
|
return FromJSVal(GetContext(), val, out);
|
|
}
|
|
|
|
template<typename CHAR>
|
|
bool ScriptInterface::Eval(const CHAR* code, JS::MutableHandleValue ret) const
|
|
{
|
|
if (!Eval_(code, ret))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
template<typename T, typename CHAR>
|
|
bool ScriptInterface::Eval(const CHAR* code, T& ret) const
|
|
{
|
|
JSAutoRequest rq(GetContext());
|
|
JS::RootedValue rval(GetContext());
|
|
if (!Eval_(code, &rval))
|
|
return false;
|
|
return FromJSVal(GetContext(), rval, ret);
|
|
}
|
|
|
|
#endif // INCLUDED_SCRIPTINTERFACE
|