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lightning-sunbird  0.9+nobinonly
nsWWJSUtils.cpp
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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00005  * The contents of this file are subject to the Mozilla Public License Version
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00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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00014  *
00015  * The Original Code is mozilla.org code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 2001
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either the GNU General Public License Version 2 or later (the "GPL"), or
00026  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
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00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 /* This file is a small subset of nsJSUtils utility functions,
00039    from the dom directory.
00040 */
00041 
00042 #include "nsCOMPtr.h"
00043 #include "nsIScriptContext.h"
00044 #include "nsIScriptGlobalObject.h"
00045 #include "nsWWJSUtils.h"
00046 #include "nsIXPConnect.h"
00047 
00048 nsIScriptGlobalObject *
00049 nsWWJSUtils::GetStaticScriptGlobal(JSContext* aContext, JSObject* aObj)
00050 {
00051   nsISupports* supports;
00052   JSClass* clazz;
00053   JSObject* parent;
00054   JSObject* glob = aObj; // starting point for search
00055 
00056   if (!glob)
00057     return nsnull;
00058 
00059   while (nsnull != (parent = JS_GetParent(aContext, glob)))
00060     glob = parent;
00061 
00062 #ifdef JS_THREADSAFE
00063   clazz = JS_GetClass(aContext, glob);
00064 #else
00065   clazz = JS_GetClass(glob);
00066 #endif
00067 
00068   if (!clazz ||
00069       !(clazz->flags & JSCLASS_HAS_PRIVATE) ||
00070       !(clazz->flags & JSCLASS_PRIVATE_IS_NSISUPPORTS) ||
00071       !(supports = (nsISupports*) JS_GetPrivate(aContext, glob))) {
00072     return nsnull;
00073   }
00074  
00075   nsCOMPtr<nsIXPConnectWrappedNative> wrapper(do_QueryInterface(supports));
00076   NS_ENSURE_TRUE(wrapper, nsnull);
00077 
00078   nsCOMPtr<nsIScriptGlobalObject> sgo(do_QueryWrappedNative(wrapper));
00079 
00080   // This will return a pointer to something we're about to release,
00081   // but that's ok here.
00082   return sgo;
00083 }
00084 
00085 nsIScriptContext *
00086 nsWWJSUtils::GetDynamicScriptContext(JSContext *aContext)
00087 {
00088   return GetScriptContextFromJSContext(aContext);
00089 }
00090 
00091 nsIScriptGlobalObject *
00092 nsWWJSUtils::GetDynamicScriptGlobal(JSContext* aContext)
00093 {
00094   nsIScriptContext *scriptCX = GetDynamicScriptContext(aContext);
00095   if (!scriptCX)
00096     return nsnull;
00097   return scriptCX->GetGlobalObject();
00098 }
00099 
00100 nsIScriptContext *
00101 nsWWJSUtils::GetStaticScriptContext(JSContext* aContext,
00102                                     JSObject* aObj)
00103 {
00104   nsIScriptGlobalObject *nativeGlobal = GetStaticScriptGlobal(aContext, aObj);
00105   if (!nativeGlobal)    
00106     return nsnull;
00107   return nativeGlobal->GetContext();
00108 }  
00109