2010-01-09 20:20:14 +01:00
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/* Copyright (C) 2009 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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#include "precompiled.h"
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#include "ScriptInterface.h"
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#include "lib/debug.h"
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#include "ps/CLogger.h"
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#include "ps/utf16string.h"
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#include <cassert>
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#include "js/jsapi.h"
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#include <boost/preprocessor/punctuation/comma_if.hpp>
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#include <boost/preprocessor/repetition/repeat.hpp>
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#ifdef USE_VALGRIND
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# include <valgrind/valgrind.h>
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#endif
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const int RUNTIME_SIZE = 4 * 1024 * 1024; // TODO: how much memory is needed?
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const int STACK_CHUNK_SIZE = 8192;
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////////////////////////////////////////////////////////////////
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struct ScriptInterface_impl
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{
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ScriptInterface_impl(const char* nativeScopeName, JSContext* cx);
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~ScriptInterface_impl();
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void Register(const char* name, JSNative fptr, uintN nargs);
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JSRuntime* m_rt; // NULL if m_cx is shared; non-NULL if we own m_cx
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JSContext* m_cx;
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JSObject* m_glob; // global scope object
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JSObject* m_nativeScope; // native function scope object
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};
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namespace
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{
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JSClass global_class = {
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"global", JSCLASS_GLOBAL_FLAGS,
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JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
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JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, JS_FinalizeStub,
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NULL, NULL, NULL, NULL,
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NULL, NULL, NULL, NULL
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};
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void ErrorReporter(JSContext* UNUSED(cx), const char* message, JSErrorReport* report)
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{
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std::stringstream msg;
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bool isWarning = JSREPORT_IS_WARNING(report->flags);
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msg << (isWarning ? "JavaScript warning: " : "JavaScript error: ");
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if (report->filename)
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{
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msg << report->filename;
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msg << " line " << report->lineno << "\n";
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}
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msg << message;
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if (isWarning)
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LOGWARNING(L"%hs", msg.str().c_str());
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else
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LOGERROR(L"%hs", msg.str().c_str());
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#ifdef USE_VALGRIND
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// When running under Valgrind, print more information in the error message
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VALGRIND_PRINTF_BACKTRACE("->");
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#endif
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}
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// Functions in the global namespace:
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JSBool print(JSContext* cx, JSObject* UNUSED(obj), uintN argc, jsval* argv, jsval* UNUSED(rval))
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{
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for (uintN i = 0; i < argc; ++i)
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{
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std::string str;
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if (!ScriptInterface::FromJSVal(cx, argv[i], str))
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return JS_FALSE;
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printf("%s", str.c_str());
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}
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fflush(stdout);
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return JS_TRUE;
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}
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} // anonymous namespace
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ScriptInterface_impl::ScriptInterface_impl(const char* nativeScopeName, JSContext* cx)
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{
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JSBool ok;
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if (cx)
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{
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m_rt = NULL;
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m_cx = cx;
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m_glob = JS_GetGlobalObject(m_cx);
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}
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else
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{
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m_rt = JS_NewRuntime(RUNTIME_SIZE);
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debug_assert(m_rt); // TODO: error handling
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m_cx = JS_NewContext(m_rt, STACK_CHUNK_SIZE);
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debug_assert(m_cx);
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// For GC debugging with SpiderMonkey 1.8+:
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// JS_SetGCZeal(m_cx, 2);
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JS_SetContextPrivate(m_cx, NULL);
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JS_SetErrorReporter(m_cx, ErrorReporter);
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JS_SetOptions(m_cx, JSOPTION_STRICT // "warn on dubious practice"
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| JSOPTION_XML // "ECMAScript for XML support: parse <!-- --> as a token"
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| JSOPTION_VAROBJFIX // "recommended" (fixes variable scoping)
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);
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// Threadsafe SpiderMonkey requires that we have a request before doing anything much
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JS_BeginRequest(m_cx);
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m_glob = JS_NewObject(m_cx, &global_class, NULL, NULL);
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ok = JS_InitStandardClasses(m_cx, m_glob);
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JS_DefineProperty(m_cx, m_glob, "global", OBJECT_TO_JSVAL(m_glob), NULL, NULL, JSPROP_ENUMERATE | JSPROP_READONLY
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| JSPROP_PERMANENT);
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}
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m_nativeScope = JS_DefineObject(m_cx, m_glob, nativeScopeName, NULL, NULL, JSPROP_ENUMERATE | JSPROP_READONLY
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| JSPROP_PERMANENT);
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JS_DefineFunction(m_cx, m_glob, "print", ::print, 0, JSPROP_ENUMERATE | JSPROP_READONLY | JSPROP_PERMANENT);
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}
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ScriptInterface_impl::~ScriptInterface_impl()
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{
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if (m_rt) // if we own the context:
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{
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JS_EndRequest(m_cx);
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JS_DestroyContext(m_cx);
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JS_DestroyRuntime(m_rt);
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}
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}
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static JSBool LoadScript(JSContext* cx, const jschar* chars, uintN length, const char* filename, jsval* rval)
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{
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JSFunction* func = JS_CompileUCFunction(cx, NULL, NULL, 0, NULL, chars, length, filename, 1);
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if (!func)
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return JS_FALSE;
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JS_AddRoot(cx, &func); // TODO: do we need to root this?
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*rval = OBJECT_TO_JSVAL((JSObject*)func);
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jsval scriptRval;
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JSBool ok = JS_CallFunction(cx, NULL, func, 0, NULL, &scriptRval);
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JS_RemoveRoot(cx, &func);
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return ok;
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}
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void ScriptInterface_impl::Register(const char* name, JSNative fptr, uintN nargs)
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{
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JS_DefineFunction(m_cx, m_nativeScope, name, fptr, nargs, JSPROP_ENUMERATE | JSPROP_READONLY | JSPROP_PERMANENT);
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}
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ScriptInterface::ScriptInterface(const char* nativeScopeName, JSContext* cx) :
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m(new ScriptInterface_impl(nativeScopeName, cx))
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{
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}
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ScriptInterface::~ScriptInterface()
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{
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}
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void ScriptInterface::ShutDown()
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{
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JS_ShutDown();
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}
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void ScriptInterface::SetCallbackData(void* cbdata)
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{
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JS_SetContextPrivate(m->m_cx, cbdata);
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}
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void* ScriptInterface::GetCallbackData(JSContext* cx)
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{
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return JS_GetContextPrivate(cx);
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}
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void ScriptInterface::Register(const char* name, JSNative fptr, size_t nargs)
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{
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m->Register(name, fptr, (uintN)nargs);
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}
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JSContext* ScriptInterface::GetContext()
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{
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return m->m_cx;
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}
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bool ScriptInterface::AddRoot(void* ptr, const char* name)
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{
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return JS_AddNamedRoot(m->m_cx, ptr, name) ? true : false;
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}
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bool ScriptInterface::RemoveRoot(void* ptr)
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{
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return JS_RemoveRoot(m->m_cx, ptr) ? true : false;
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}
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ScriptInterface::LocalRootScope::LocalRootScope(JSContext* cx) :
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m_cx(cx)
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{
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m_OK = JS_EnterLocalRootScope(m_cx) ? true : false;
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}
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ScriptInterface::LocalRootScope::~LocalRootScope()
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{
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if (m_OK)
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JS_LeaveLocalRootScope(m_cx);
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}
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bool ScriptInterface::LocalRootScope::OK()
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{
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return m_OK;
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}
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jsval ScriptInterface::CallConstructor(jsval ctor)
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{
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// Constructing JS objects similarly to "new Foo" is non-trivial.
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// https://developer.mozilla.org/En/SpiderMonkey/JSAPI_Phrasebook#Constructing_an_object_with_new
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// suggests some ugly ways, so we'll use a different way that's less compatible but less ugly
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if (!(JSVAL_IS_OBJECT(ctor) && JS_ObjectIsFunction(m->m_cx, JSVAL_TO_OBJECT(ctor))))
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{
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LOGERROR(L"CallConstructor: ctor is not a function object");
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return JSVAL_VOID;
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}
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// Get the constructor's prototype
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// (Can't use JS_GetPrototype, since we want .prototype not .__proto__)
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jsval protoVal;
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if (!JS_GetProperty(m->m_cx, JSVAL_TO_OBJECT(ctor), "prototype", &protoVal))
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{
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LOGERROR(L"CallConstructor: can't get prototype");
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return JSVAL_VOID;
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}
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if (!JSVAL_IS_OBJECT(protoVal))
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{
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LOGERROR(L"CallConstructor: prototype is not an object");
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return JSVAL_VOID;
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}
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JSObject* proto = JSVAL_TO_OBJECT(protoVal);
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JSObject* parent = JS_GetParent(m->m_cx, JSVAL_TO_OBJECT(ctor));
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// TODO: rooting?
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if (!proto || !parent)
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{
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LOGERROR(L"CallConstructor: null proto/parent");
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return JSVAL_VOID;
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}
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JSObject* obj = JS_NewObject(m->m_cx, NULL, proto, parent);
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if (!obj)
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{
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LOGERROR(L"CallConstructor: object creation failed");
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return JSVAL_VOID;
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}
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jsval rval;
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if (!JS_CallFunctionValue(m->m_cx, obj, ctor, 0, NULL, &rval))
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{
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LOGERROR(L"CallConstructor: ctor failed");
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return JSVAL_VOID;
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}
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return OBJECT_TO_JSVAL(obj);
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}
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bool ScriptInterface::CallFunctionVoid(jsval val, const char* name)
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{
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jsval jsRet;
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std::vector<jsval> argv;
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return CallFunction_(val, name, argv, jsRet);
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}
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bool ScriptInterface::CallFunction_(jsval val, const char* name, std::vector<jsval>& args, jsval& ret)
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{
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const uintN argc = args.size();
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jsval* argv = NULL;
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if (argc)
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argv = &args[0];
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JSObject* obj;
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if (!JS_ValueToObject(m->m_cx, val, &obj) || obj == NULL)
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return false;
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JS_AddRoot(m->m_cx, &obj);
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// Check that the named function actually exists, to avoid ugly JS error reports
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// when calling an undefined value
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JSBool found;
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if (!JS_HasProperty(m->m_cx, obj, name, &found) || !found)
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{
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JS_RemoveRoot(m->m_cx, &obj);
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return false;
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}
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JSBool ok = JS_CallFunctionName(m->m_cx, obj, name, argc, argv, &ret);
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JS_RemoveRoot(m->m_cx, &obj);
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return ok ? true : false;
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}
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jsval ScriptInterface::GetGlobalObject()
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{
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return OBJECT_TO_JSVAL(JS_GetGlobalObject(m->m_cx));
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}
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2010-01-24 18:24:35 +01:00
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bool ScriptInterface::SetGlobal_(const char* name, jsval value, bool replace)
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2010-01-09 20:20:14 +01:00
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{
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2010-01-24 18:24:35 +01:00
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if (!replace)
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{
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JSBool found;
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if (!JS_HasProperty(m->m_cx, m->m_glob, name, &found))
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return false;
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if (found)
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{
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JS_ReportError(m->m_cx, "SetGlobal \"%s\" called multiple times", name);
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return false;
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}
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}
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2010-01-09 20:20:14 +01:00
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JSBool ok = JS_DefineProperty(m->m_cx, m->m_glob, name, value, NULL, NULL, JSPROP_ENUMERATE | JSPROP_READONLY
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| JSPROP_PERMANENT);
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return ok ? true : false;
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}
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bool ScriptInterface::SetProperty_(jsval obj, const char* name, jsval value, bool constant)
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{
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uintN attrs;
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if (constant)
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attrs = JSPROP_READONLY | JSPROP_PERMANENT;
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else
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attrs = JSPROP_ENUMERATE;
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if (! JSVAL_IS_OBJECT(obj))
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return false;
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JSObject* object = JSVAL_TO_OBJECT(obj);
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if (! JS_DefineProperty(m->m_cx, object, name, value, NULL, NULL, attrs))
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return false;
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return true;
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}
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bool ScriptInterface::GetProperty_(jsval obj, const char* name, jsval& out)
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{
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if (! JSVAL_IS_OBJECT(obj))
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return false;
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JSObject* object = JSVAL_TO_OBJECT(obj);
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if (!JS_GetProperty(m->m_cx, object, name, &out))
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return false;
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return true;
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}
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bool ScriptInterface::EnumeratePropertyNamesWithPrefix(jsval obj, const char* prefix, std::vector<std::string>& out)
|
|
|
|
{
|
|
|
|
LOCAL_ROOT_SCOPE;
|
|
|
|
|
|
|
|
utf16string prefix16 (prefix, prefix+strlen(prefix));
|
|
|
|
|
|
|
|
if (! JSVAL_IS_OBJECT(obj))
|
|
|
|
return false; // TODO: log error messages
|
|
|
|
|
|
|
|
JSObject* it = JS_NewPropertyIterator(m->m_cx, JSVAL_TO_OBJECT(obj));
|
|
|
|
if (!it)
|
|
|
|
return false;
|
|
|
|
|
|
|
|
while (true)
|
|
|
|
{
|
|
|
|
jsid idp;
|
|
|
|
jsval val;
|
|
|
|
if (! JS_NextProperty(m->m_cx, it, &idp) || ! JS_IdToValue(m->m_cx, idp, &val))
|
|
|
|
return false;
|
|
|
|
if (val == JSVAL_VOID)
|
|
|
|
break; // end of iteration
|
|
|
|
if (! JSVAL_IS_STRING(val))
|
|
|
|
continue; // ignore integer properties
|
|
|
|
|
|
|
|
JSString* name = JSVAL_TO_STRING(val);
|
|
|
|
size_t len = JS_GetStringLength(name);
|
|
|
|
jschar* chars = JS_GetStringChars(name);
|
|
|
|
if (len >= prefix16.size() && memcmp(chars, prefix16.c_str(), prefix16.size()*2) == 0)
|
|
|
|
out.push_back(std::string(chars, chars+len)); // handles Unicode poorly
|
|
|
|
}
|
|
|
|
|
|
|
|
// Recurse up the prototype chain
|
|
|
|
JSObject* prototype = JS_GetPrototype(m->m_cx, JSVAL_TO_OBJECT(obj));
|
|
|
|
if (prototype)
|
|
|
|
{
|
|
|
|
if (! EnumeratePropertyNamesWithPrefix(OBJECT_TO_JSVAL(prototype), prefix, out))
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool ScriptInterface::SetPrototype(jsval obj, jsval proto)
|
|
|
|
{
|
|
|
|
if (!JSVAL_IS_OBJECT(obj) || !JSVAL_IS_OBJECT(proto))
|
|
|
|
return false;
|
|
|
|
return JS_SetPrototype(m->m_cx, JSVAL_TO_OBJECT(obj), JSVAL_TO_OBJECT(proto)) ? true : false;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool ScriptInterface::LoadScript(const std::wstring& filename, const std::wstring& code)
|
|
|
|
{
|
|
|
|
std::string fnAscii(filename.begin(), filename.end());
|
|
|
|
utf16string codeUtf16(code.begin(), code.end());
|
|
|
|
jsval rval;
|
|
|
|
JSBool ok = ::LoadScript(m->m_cx, reinterpret_cast<const jschar*> (codeUtf16.c_str()), (uintN)(codeUtf16.length()),
|
|
|
|
fnAscii.c_str(), &rval);
|
|
|
|
return ok ? true : false;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool ScriptInterface::Eval(const char* code)
|
|
|
|
{
|
|
|
|
jsval rval;
|
|
|
|
return Eval_(code, rval);
|
|
|
|
}
|
|
|
|
|
|
|
|
bool ScriptInterface::Eval_(const char* code, jsval& rval)
|
|
|
|
{
|
|
|
|
utf16string codeUtf16(code, code+strlen(code));
|
|
|
|
|
|
|
|
JSBool ok = JS_EvaluateUCScript(m->m_cx, m->m_glob, (const jschar*)codeUtf16.c_str(), (uintN)codeUtf16.length(), "(eval)", 1, &rval);
|
|
|
|
return ok ? true : false;
|
|
|
|
}
|
|
|
|
|
|
|
|
void ScriptInterface::ReportError(const char* msg)
|
|
|
|
{
|
|
|
|
// JS_ReportError by itself doesn't seem to set a JS-style exception, and so
|
|
|
|
// script callers will be unable to catch anything. So use JS_SetPendingException
|
|
|
|
// to make sure there really is a script-level exception. But just set it to undefined
|
|
|
|
// because there's not much value yet in throwing a real exception object.
|
|
|
|
JS_SetPendingException(m->m_cx, JSVAL_VOID);
|
|
|
|
// And report the actual error
|
|
|
|
JS_ReportError(m->m_cx, "%s", msg);
|
|
|
|
|
|
|
|
// TODO: Why doesn't JS_ReportPendingException(m->m_cx); work?
|
|
|
|
}
|
|
|
|
|
|
|
|
bool ScriptInterface::IsExceptionPending(JSContext* cx)
|
|
|
|
{
|
|
|
|
return JS_IsExceptionPending(cx) ? true : false;
|
|
|
|
}
|
|
|
|
|
|
|
|
JSClass* ScriptInterface::GetClass(JSContext* cx, JSObject* obj)
|
|
|
|
{
|
|
|
|
return JS_GetClass(cx, obj);
|
|
|
|
}
|
|
|
|
|
|
|
|
void* ScriptInterface::GetPrivate(JSContext* cx, JSObject* obj)
|
|
|
|
{
|
|
|
|
// TODO: use JS_GetInstancePrivate
|
|
|
|
return JS_GetPrivate(cx, obj);
|
|
|
|
}
|