/* ***** BEGIN LICENSE BLOCK *****
 * 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 mozilla.org.
 * Portions created by the Initial Developer are Copyright (C) 2005
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *  Mark Hammond (initial development)
 *
 * 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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 * ***** END LICENSE BLOCK ***** */

#ifndef nsIScriptRuntime_h__
#define nsIScriptRuntime_h__

#include "nsIScriptContext.h"

#define NS_ISCRIPTRUNTIME_IID \
{ 0x2c8d774e, 0xb52a, 0x43ec, \
  { 0x8e, 0xbc, 0x82, 0x75, 0xb9, 0x34, 0x20, 0x57 } }

/**
 * A singleton language environment for an application.  Responsible for
 * initializing and cleaning up the global language environment, and a factory
 * for language contexts
 */
class nsIScriptRuntime : public nsISupports
{
public:
  NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISCRIPTRUNTIME_IID)
  /*
   * Return the language ID of this script language
   */
  virtual PRUint32 GetScriptTypeID() = 0;

  /* Parses a "version string" for the language into a bit-mask used by
   * the language implementation.  If the specified version is not supported
   * an error should be returned.  If the specified version is blank, a default
   * version should be assumed
   */
  virtual nsresult ParseVersion(const nsString &aVersionStr, PRUint32 *verFlags) = 0;
  
  /* Factory for a new context for this language */
  virtual already_AddRefed<nsIScriptContext> CreateContext() = 0;
  
  /* Memory managment for script objects returned from various
   * nsIScriptContext methods.  These are identical to those in
   * nsIScriptContext, but are useful when a script context is not known.
   */
  virtual nsresult DropScriptObject(void *object) = 0;
  virtual nsresult HoldScriptObject(void *object) = 0;
};

NS_DEFINE_STATIC_IID_ACCESSOR(nsIScriptRuntime, NS_ISCRIPTRUNTIME_IID)

/* helper functions */
nsresult NS_GetScriptRuntime(const nsAString &aLanguageName,
                             nsIScriptRuntime **aRuntime);

nsresult NS_GetScriptRuntimeByID(PRUint32 aLanguageID,
                                 nsIScriptRuntime **aRuntime);

#endif // nsIScriptRuntime_h__