/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2001
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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/* This file is a small subset of nsJSUtils utility functions,
   from the dom directory.
*/

#include "nsCOMPtr.h"
#include "nsIScriptContext.h"
#include "nsIScriptGlobalObject.h"
#include "nsWWJSUtils.h"
#include "nsIXPConnect.h"
#include "nsDOMJSUtils.h"

nsIScriptGlobalObject *
nsWWJSUtils::GetStaticScriptGlobal(JSContext* aContext, JSObject* aObj)
{
  nsISupports* supports;
  JSClass* clazz;
  JSObject* parent;
  JSObject* glob = aObj; // starting point for search

  if (!glob)
    return nsnull;

  while (nsnull != (parent = JS_GetParent(aContext, glob)))
    glob = parent;

#ifdef JS_THREADSAFE
  clazz = JS_GetClass(aContext, glob);
#else
  clazz = JS_GetClass(glob);
#endif

  if (!clazz ||
      !(clazz->flags & JSCLASS_HAS_PRIVATE) ||
      !(clazz->flags & JSCLASS_PRIVATE_IS_NSISUPPORTS) ||
      !(supports = (nsISupports*) JS_GetPrivate(aContext, glob))) {
    return nsnull;
  }
 
  nsCOMPtr<nsIXPConnectWrappedNative> wrapper(do_QueryInterface(supports));
  NS_ENSURE_TRUE(wrapper, nsnull);

  nsCOMPtr<nsIScriptGlobalObject> sgo(do_QueryWrappedNative(wrapper));

  // This will return a pointer to something we're about to release,
  // but that's ok here.
  return sgo;
}

nsIScriptContext *
nsWWJSUtils::GetDynamicScriptContext(JSContext *aContext)
{
  return GetScriptContextFromJSContext(aContext);
}

nsIScriptGlobalObject *
nsWWJSUtils::GetDynamicScriptGlobal(JSContext* aContext)
{
  nsIScriptContext *scriptCX = GetDynamicScriptContext(aContext);
  if (!scriptCX)
    return nsnull;
  return scriptCX->GetGlobalObject();
}

nsIScriptContext *
nsWWJSUtils::GetStaticScriptContext(JSContext* aContext,
                                    JSObject* aObj)
{
  nsIScriptGlobalObject *nativeGlobal = GetStaticScriptGlobal(aContext, aObj);
  if (!nativeGlobal)    
    return nsnull;
  return nativeGlobal->GetContext();
}  

