gecko/dom/base/nsIScriptGlobalObject.h

133 lines
4.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsIScriptGlobalObject_h__
#define nsIScriptGlobalObject_h__
#include "nsISupports.h"
#include "nsEvent.h"
#include "nsIProgrammingLanguage.h"
class nsIScriptContext;
class nsIDOMEvent;
class nsIScriptGlobalObjectOwner;
class nsIArray;
class nsScriptErrorEvent;
class nsIScriptGlobalObject;
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
#define NS_STID_ARRAY_UBOUND (NS_STID_LAST-NS_STID_FIRST+1)
// 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 true if HandleDOMEvent was actually called, in which case
// aStatus will be filled in with the status.
bool
NS_HandleScriptError(nsIScriptGlobalObject *aScriptGlobal,
nsScriptErrorEvent *aErrorEvent,
nsEventStatus *aStatus);
#define NS_ISCRIPTGLOBALOBJECT_IID \
{ 0x92569431, 0x6e6e, 0x408a, \
{ 0xa8, 0x8c, 0x45, 0x28, 0x5c, 0x1c, 0x85, 0x73 } }
/**
* 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
{
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISCRIPTGLOBALOBJECT_IID)
/**
* 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() = 0;
/**
* Get a script context (WITHOUT added reference) for the specified language.
*/
virtual nsIScriptContext *GetScriptContext() = 0;
virtual JSObject* GetGlobalJSObject() = 0;
nsIScriptContext* GetContext() {
return GetScriptContext();
}
/**
* 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(JSObject* aObject) = 0;
/**
* Called to enable/disable scripts.
*/
virtual void SetScriptsEnabled(bool aEnabled, bool aFireTimeouts) = 0;
/**
* Handle a script error. Generally called by a script context.
*/
virtual nsresult HandleScriptError(nsScriptErrorEvent *aErrorEvent,
nsEventStatus *aEventStatus) {
return NS_HandleScriptError(this, aErrorEvent, aEventStatus);
}
virtual bool IsBlackForCC() { return false; }
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsIScriptGlobalObject,
NS_ISCRIPTGLOBALOBJECT_IID)
#endif