Sat, 07 Apr 2007 20:58:08 -0700
changeset 404 89c508adc69d67626f6b63672b324b270a089667
parent 1 9b2a99adc05e53cd4010de512f50118594756650
child 4431 25df0b7d2eda7f74985a04b2748e7fcfe1f83c33
permissions -rw-r--r--
Fix for bug 376753 - Allow QueryInterface to IA2 witout crashing, patches=aaronlev, me, r=me, aaronlev

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=80: */
/* ***** 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
 * 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 code.
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 * Contributor(s):
 * Alternatively, the contents of this file may be used under the terms of
 * either of 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
 * of those above. If you wish to allow use of your version of this file only
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 * ***** END LICENSE BLOCK ***** */

#ifndef nsIScriptGlobalObject_h__
#define nsIScriptGlobalObject_h__

#include "nsISupports.h"
#include "nsEvent.h"
#include "nsIProgrammingLanguage.h"

class nsIScriptContext;
class nsIDOMDocument;
class nsIDOMEvent;
class nsPresContext;
class nsIScriptGlobalObjectOwner;
class nsIArray;
class nsScriptErrorEvent;
class nsIScriptGlobalObject;
enum nsEventStatus;
struct JSObject; // until we finally remove GetGlobalJSObject...

// Some helpers for working with integer "script type IDs", and specifically
// for working with arrays of such objects. For example, it is common for
// implementations supporting multiple script languages to keep each
// language's nsIScriptContext in an array indexed by the language ID.

// Implementation note: We always ignore nsIProgrammingLanguage::UNKNOWN and
// nsIProgrammingLanguage::CPLUSPLUS - this gives javascript slot 0.  An
// attempted micro-optimization tried to avoid us going all the way to 
// nsIProgrammingLanguage::MAX; however:
// * Someone is reportedly working on a PHP impl - that has value 9
// * nsGenericElement therefore allows 4 bits for the value.
// So there is no good reason for us to be more restrictive again...

#define NS_STID_FIRST nsIProgrammingLanguage::JAVASCRIPT
// like nsGenericElement, only 4 bits worth is valid...
#define NS_STID_LAST (nsIProgrammingLanguage::MAX > 0x000FU ? \
                      0x000FU : nsIProgrammingLanguage::MAX)

// Use to declare the array size

// Is a language ID valid?
#define NS_STID_VALID(langID) (langID >= NS_STID_FIRST && langID <= NS_STID_LAST)

// Return an index for a given ID.
#define NS_STID_INDEX(langID) (langID-NS_STID_FIRST)

// Create a 'for' loop iterating over all possible language IDs (*not* indexes)
#define NS_STID_FOR_ID(varName) \
          for (varName=NS_STID_FIRST;varName<=NS_STID_LAST;varName++)

// Create a 'for' loop iterating over all indexes (when you don't need to know
// what language it is)
#define NS_STID_FOR_INDEX(varName) \
          for (varName=0;varName<=NS_STID_INDEX(NS_STID_LAST);varName++)

// A helper function for nsIScriptGlobalObject implementations to use
// when handling a script error.  Generally called by the global when a context
// notifies it of an error via nsIScriptGlobalObject::HandleScriptError.
// Returns PR_TRUE if HandleDOMEvent was actually called, in which case
// aStatus will be filled in with the status.
NS_HandleScriptError(nsIScriptGlobalObject *aScriptGlobal,
                     nsScriptErrorEvent *aErrorEvent,
                     nsEventStatus *aStatus);

{ /* {6E7EF978-47D0-47c9-9649-CDCDB1E4CCEC} */ \
  0x6e7ef978, 0x47d0, 0x47c9, \
  { 0x96, 0x49, 0xcd, 0xcd, 0xb1, 0xe4, 0xcc, 0xec } }

+  * The global object which keeps a script context for each supported script
+  * language. This often used to store per-window global state.

class nsIScriptGlobalObject : public nsISupports

   * Let the script global object know who its owner is.
   * The script global object should not addref the owner. It
   * will be told when the owner goes away.
   * @return NS_OK if the method is successful
  virtual void SetGlobalObjectOwner(nsIScriptGlobalObjectOwner* aOwner) = 0;

   * Get the owner of the script global object. The method
   * addrefs the returned reference according to regular
   * XPCOM rules, even though the internal reference itself
   * is a "weak" reference.
  virtual nsIScriptGlobalObjectOwner *GetGlobalObjectOwner() = 0;

   * Ensure that the script global object is initialized for working with the
   * specified script language ID.  This will set up the nsIScriptContext
   * and 'script global' for that language, allowing these to be fetched
   * and manipulated.
   * @return NS_OK if successful; error conditions include that the language
   * has not been registered, as well as 'normal' errors, such as
   * out-of-memory
  virtual nsresult EnsureScriptEnvironment(PRUint32 aLangID) = 0;
   * Get a script context (WITHOUT added reference) for the specified language.
  virtual nsIScriptContext *GetScriptContext(PRUint32 lang) = 0;
   * Get the opaque "global" object for the specified lang.
  virtual void *GetScriptGlobal(PRUint32 lang) = 0;

  // Set/GetContext deprecated methods - use GetScriptContext/Global
  virtual JSObject *GetGlobalJSObject() {
        return (JSObject *)GetScriptGlobal(nsIProgrammingLanguage::JAVASCRIPT);

  virtual nsIScriptContext *GetContext() {
        return GetScriptContext(nsIProgrammingLanguage::JAVASCRIPT);

   * Set a new language context for this global.  The native global for the
   * context is created by the context's GetNativeGlobal() method.

  virtual nsresult SetScriptContext(PRUint32 lang, nsIScriptContext *aContext) = 0;

   * Called when the global script for a language is finalized, typically as
   * part of its GC process.  By the time this call is made, the
   * nsIScriptContext for the language has probably already been removed.
   * After this call, the passed object is dead - which should generally be the
   * same object the global is using for a global for that language.

  virtual void OnFinalize(PRUint32 aLangID, void *aScriptGlobal) = 0;

   * Called to enable/disable scripts.
  virtual void SetScriptsEnabled(PRBool aEnabled, PRBool aFireTimeouts) = 0;

  /** Set a new arguments object for this window. This will be set on
   * the window right away (if there's an existing document) and it
   * will also be installed on the window when the next document is
   * loaded.  Each language impl is responsible for converting to
   * an array of args as appropriate for that language.
  virtual nsresult SetNewArguments(nsIArray *aArguments) = 0;

  /** Handle a script error.  Generally called by a script context.
  virtual nsresult HandleScriptError(nsScriptErrorEvent *aErrorEvent,
                                     nsEventStatus *aEventStatus) {
    return NS_HandleScriptError(this, aErrorEvent, aEventStatus);