gecko-dev/dom/public/nsIScriptContext.h
brendan%mozilla.org cfe8cb3e89 (bug 22795, r=vidur@netscape.com)
- Add "aShared" flag to nsIScriptContext::CompileEventHandler, telling it to clear the compiled event handler's scope chain if true, in order to
  (a) avoid entraining garbage
      (i.e., a shared compile-time-only parent object); and
  (b) cause later BindCompiledEventHandler calls to ensure that the event handler has the particular scope chain needed for the binding
      (to the target object that's receiving the event).
- Use :: consistently (and all over the place) before calls to JS_ functions in nsJSEnvironment.cpp.
- Eliminate tabs and barbarians-at-the-gate-of-Rome style, in favor of when-in-Rome style (hail Waterson Maximus!)
2000-01-08 00:24:24 +00:00

330 lines
12 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998-1999 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#ifndef nsIScriptContext_h__
#define nsIScriptContext_h__
#include "nscore.h"
#include "nsString.h"
#include "nsISupports.h"
class nsIScriptGlobalObject;
class nsIScriptSecurityManager;
class nsIScriptNameSpaceManager;
class nsIScriptContextOwner;
class nsIPrincipal;
typedef void (*nsScriptTerminationFunc)(nsISupports* aRef);
#define NS_ISCRIPTCONTEXT_IID \
{ /* 8f6bca7d-ce42-11d1-b724-00600891d8c9 */ \
0x8f6bca7d, 0xce42, 0x11d1, \
{0xb7, 0x24, 0x00, 0x60, 0x08, 0x91, 0xd8, 0xc9} }
/**
* It is used by the application to initialize a runtime and run scripts.
* A script runtime would implement this interface.
* <P><I>It does have a bit too much java script information now, that
* should be removed in a short time. Ideally this interface will be
* language neutral</I>
*/
class nsIScriptContext : public nsISupports {
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_ISCRIPTCONTEXT_IID)
// deprecated: remove later (XXXbe when is later?)
NS_IMETHOD EvaluateString(const nsString& aScript,
const char *aURL,
PRUint32 aLineNo,
const char* aVersion,
nsString& aRetValue,
PRBool* aIsUndefined) = 0;
/**
* Compile and execute a script.
*
* @param aScript a string representing the script to be executed
* @param aScopeObject a JavaScript JSObject for the scope to execute in, or
* nsnull to use a default scope
* @param aPrincipal the principal that produced the script
* @param aURL the URL or filename for error messages
* @param aLineNo the starting line number for the script for error messages
* @param aVersion the script language version to use when executing
* @param aRetValue the result of executing the script
* @param aIsUndefined true if the result of executing the script is the
* undefined value
*
* @return NS_OK if the script was valid and got executed
*
**/
NS_IMETHOD EvaluateString(const nsString& aScript,
void *aScopeObject,
nsIPrincipal *aPrincipal,
const char *aURL,
PRUint32 aLineNo,
const char* aVersion,
nsString& aRetValue,
PRBool* aIsUndefined) = 0;
/**
* Compile a script.
*
* @param aText a PRUnichar buffer containing script source
* @param aTextLength number of characters in aText
* @param aScopeObject an object telling the scope in which to execute,
* or nsnull to use a default scope
* @param aPrincipal the principal that produced the script
* @param aURL the URL or filename for error messages
* @param aLineNo the starting line number for the script for error messages
* @param aVersion the script language version to use when executing
* @param aScriptObject an executable object that's the result of compiling
* the script. The caller is responsible for GC rooting
* this object.
*
* @return NS_OK if the script source was valid and got compiled
*
**/
NS_IMETHOD CompileScript(const PRUnichar* aText,
PRInt32 aTextLength,
void* aScopeObject,
nsIPrincipal* aPrincipal,
const char* aURL,
PRUint32 aLineNo,
const char* aVersion,
void** aScriptObject) = 0;
/**
* Execute a precompiled script object.
*
* @param aScriptObject an object representing the script to be executed
* @param aScopeObject an object telling the scope in which to execute,
* or nsnull to use a default scope
* @param aRetValue the result of executing the script, may be null in
* which case no result string is computed
* @param aIsUndefined true if the result of executing the script is the
* undefined value, may be null for "don't care"
*
* @return NS_OK if the script was valid and got executed
*
*/
NS_IMETHOD ExecuteScript(void* aScriptObject,
void* aScopeObject,
nsString* aRetValue,
PRBool* aIsUndefined) = 0;
/**
* Compile the event handler named by atom aName, with function body aBody
* into a function object returned if ok via *aHandler. Bind the lowercase
* ASCII name to the function in its parent object aTarget.
*
* @param aTarget an object telling the scope in which to bind the compiled
* event handler function to aName.
* @param aName an nsIAtom pointer naming the function; it must be lowercase
* and ASCII, and should not be longer than 63 chars. This bound on
* length is enforced only by assertions, so caveat caller!
* @param aBody the event handler function's body
* @param aShared flag telling whether the compiled event handler will be
* shared via nsIScriptEventHandlerOwner, in which case any static
* link compiled into it based on aTarget should be cleared, both
* to avoid entraining garbage to be collected, and to trigger static
* link re-binding in BindCompiledEventHandler (see below).
* @param aHandler the out parameter in which a void pointer to the compiled
* function object is returned on success; may be null, meaning the
* caller doesn't need to store the handler for later use.
*
* @return NS_OK if the function body was valid and got compiled
*/
NS_IMETHOD CompileEventHandler(void* aTarget,
nsIAtom* aName,
const nsString& aBody,
PRBool aShared,
void** aHandler) = 0;
/**
* Call the function object with given args and return its boolean result,
* or true if the result isn't boolean.
*
* @param aTarget an object telling the scope in which to bind the compiled
* event handler function.
* @param aHandler function object (function and static scope) to invoke.
* @param argc actual argument count; length of argv
* @param argv vector of arguments; length is argc
* @param aBoolResult out parameter returning boolean function result, or
* true if the result was not boolean.
**/
NS_IMETHOD CallEventHandler(void* aTarget, void* aHandler,
PRUint32 argc, void* argv,
PRBool* aBoolResult) = 0;
/**
* Bind an already-compiled event handler function to a name in the given
* scope object. The same restrictions on aName (lowercase ASCII, not too
* long) applies here as for CompileEventHandler. Scripting languages with
* static scoping must re-bind the scope chain for aHandler to begin (after
* the activation scope for aHandler itself, typically) with aTarget's scope.
*
* @param aTarget an object telling the scope in which to bind the compiled
* event handler function.
* @param aName an nsIAtom pointer naming the function; it must be lowercase
* and ASCII, and should not be longer than 63 chars. This bound on
* length is enforced only by assertions, so caveat caller!
* @param aHandler the function object to name, created by an earlier call to
* CompileEventHandler
* @return NS_OK if the function was successfully bound to the name
*/
NS_IMETHOD BindCompiledEventHandler(void* aTarget,
nsIAtom* aName,
void* aHandler) = 0;
/**
* Set the default scripting language version for this context, which must
* be a context specific to a particular scripting language.
*
**/
NS_IMETHOD SetDefaultLanguageVersion(const char* aVersion) = 0;
/**
* Return the global object.
*
**/
NS_IMETHOD_(nsIScriptGlobalObject*) GetGlobalObject() = 0;
/**
* Return the native script context
*
**/
NS_IMETHOD_(void*) GetNativeContext() = 0;
/**
* Init all DOM classes.
*
**/
NS_IMETHOD InitClasses() = 0;
/**
* Init this context.
*
* @param aGlobalObject the gobal object
*
* @return NS_OK if context initialization was successful
*
**/
NS_IMETHOD InitContext(nsIScriptGlobalObject *aGlobalObject) = 0;
/**
* Check to see if context is as yet intialized. Used to prevent
* reentrancy issues during the initialization process.
*
* @return NS_OK if initialized, NS_COMFALSE if not
*
*/
NS_IMETHOD IsContextInitialized() = 0;
/**
* Add a reference to a script object. For garbage collected systems
* the address of a slot to be used as a root is also provided. For
* reference counted systems, the object is provided.
*
* @param aSlot Slot to use as a root for garbage collected systems
* @param aScriptObject Script object being referenced
* @param aName Name of the reference (could be null)
*
* @return NS_OK if the method is successful
*/
NS_IMETHOD AddNamedReference(void *aSlot, void *aScriptObject,
const char *aName) = 0;
/**
* Remove a reference to a script object. For garbage collected
* systems, this is equivalent to removing a root.
*
* @param aSlot Slot corresponding to the removed root
* @param aScriptObject script object to whom a reference is released
*
* @return NS_OK if the method is successful
*/
NS_IMETHOD RemoveReference(void *aSlot, void *aScriptObject) = 0;
/**
* For garbage collected systems, do a synchronous collection pass.
* May be a no-op on other systems
*
* @return NS_OK if the method is successful
*/
NS_IMETHOD GC() = 0;
/**
* Get the name space manager for this context.
* @return NS_OK if the method is successful
*/
NS_IMETHOD GetNameSpaceManager(nsIScriptNameSpaceManager** aInstancePtr) = 0;
/**
* Get the security manager for this context.
* @return NS_OK if the method is successful
*/
NS_IMETHOD GetSecurityManager(nsIScriptSecurityManager** aInstancePtr) = 0;
/**
* Inform the context that a script was evaluated.
* A GC may be done if "necessary."
* This call is necessary if script evaluation is done
* without using the EvaluateScript method.
* @return NS_OK if the method is successful
*/
NS_IMETHOD ScriptEvaluated(void) = 0;
/**
* Let the script context know who its owner is.
* The script context should not addref the owner. It
* will be told when the owner goes away.
* @return NS_OK if the method is successful
*/
NS_IMETHOD SetOwner(nsIScriptContextOwner* owner) = 0;
/**
* Get the script context of the owner. The method
* addrefs the returned reference according to regular
* XPCOM rules, even though the internal reference itself
* is a "weak" reference.
*/
NS_IMETHOD GetOwner(nsIScriptContextOwner** owner) = 0;
/**
* Called to specify a function that should be called when the current
* script (if there is one) terminates. Generally used if breakdown
* of script state needs to be happen, but should be deferred till
* the end of script evaluation.
*/
NS_IMETHOD SetTerminationFunction(nsScriptTerminationFunc aFunc,
nsISupports* aRef) = 0;
};
/**
* Return a new Context
*
*/
extern "C" NS_DOM nsresult NS_CreateScriptContext(nsIScriptGlobalObject *aGlobal, nsIScriptContext **aContext);
#endif // nsIScriptContext_h__