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cfe8cb3e89
- 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!)
330 lines
12 KiB
C++
330 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998-1999 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#ifndef nsIScriptContext_h__
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#define nsIScriptContext_h__
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#include "nscore.h"
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#include "nsString.h"
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#include "nsISupports.h"
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class nsIScriptGlobalObject;
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class nsIScriptSecurityManager;
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class nsIScriptNameSpaceManager;
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class nsIScriptContextOwner;
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class nsIPrincipal;
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typedef void (*nsScriptTerminationFunc)(nsISupports* aRef);
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#define NS_ISCRIPTCONTEXT_IID \
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{ /* 8f6bca7d-ce42-11d1-b724-00600891d8c9 */ \
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0x8f6bca7d, 0xce42, 0x11d1, \
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{0xb7, 0x24, 0x00, 0x60, 0x08, 0x91, 0xd8, 0xc9} }
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/**
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* It is used by the application to initialize a runtime and run scripts.
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* A script runtime would implement this interface.
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* <P><I>It does have a bit too much java script information now, that
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* should be removed in a short time. Ideally this interface will be
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* language neutral</I>
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*/
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class nsIScriptContext : public nsISupports {
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public:
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NS_DEFINE_STATIC_IID_ACCESSOR(NS_ISCRIPTCONTEXT_IID)
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// deprecated: remove later (XXXbe when is later?)
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NS_IMETHOD EvaluateString(const nsString& aScript,
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const char *aURL,
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PRUint32 aLineNo,
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const char* aVersion,
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nsString& aRetValue,
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PRBool* aIsUndefined) = 0;
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/**
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* Compile and execute a script.
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*
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* @param aScript a string representing the script to be executed
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* @param aScopeObject a JavaScript JSObject for the scope to execute in, or
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* nsnull to use a default scope
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* @param aPrincipal the principal that produced the script
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* @param aURL the URL or filename for error messages
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* @param aLineNo the starting line number for the script for error messages
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* @param aVersion the script language version to use when executing
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* @param aRetValue the result of executing the script
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* @param aIsUndefined true if the result of executing the script is the
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* undefined value
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*
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* @return NS_OK if the script was valid and got executed
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*
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**/
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NS_IMETHOD EvaluateString(const nsString& aScript,
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void *aScopeObject,
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nsIPrincipal *aPrincipal,
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const char *aURL,
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PRUint32 aLineNo,
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const char* aVersion,
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nsString& aRetValue,
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PRBool* aIsUndefined) = 0;
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/**
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* Compile a script.
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*
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* @param aText a PRUnichar buffer containing script source
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* @param aTextLength number of characters in aText
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* @param aScopeObject an object telling the scope in which to execute,
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* or nsnull to use a default scope
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* @param aPrincipal the principal that produced the script
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* @param aURL the URL or filename for error messages
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* @param aLineNo the starting line number for the script for error messages
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* @param aVersion the script language version to use when executing
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* @param aScriptObject an executable object that's the result of compiling
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* the script. The caller is responsible for GC rooting
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* this object.
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*
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* @return NS_OK if the script source was valid and got compiled
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*
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**/
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NS_IMETHOD CompileScript(const PRUnichar* aText,
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PRInt32 aTextLength,
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void* aScopeObject,
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nsIPrincipal* aPrincipal,
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const char* aURL,
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PRUint32 aLineNo,
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const char* aVersion,
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void** aScriptObject) = 0;
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/**
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* Execute a precompiled script object.
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*
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* @param aScriptObject an object representing the script to be executed
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* @param aScopeObject an object telling the scope in which to execute,
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* or nsnull to use a default scope
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* @param aRetValue the result of executing the script, may be null in
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* which case no result string is computed
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* @param aIsUndefined true if the result of executing the script is the
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* undefined value, may be null for "don't care"
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*
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* @return NS_OK if the script was valid and got executed
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*
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*/
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NS_IMETHOD ExecuteScript(void* aScriptObject,
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void* aScopeObject,
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nsString* aRetValue,
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PRBool* aIsUndefined) = 0;
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/**
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* Compile the event handler named by atom aName, with function body aBody
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* into a function object returned if ok via *aHandler. Bind the lowercase
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* ASCII name to the function in its parent object aTarget.
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*
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* @param aTarget an object telling the scope in which to bind the compiled
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* event handler function to aName.
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* @param aName an nsIAtom pointer naming the function; it must be lowercase
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* and ASCII, and should not be longer than 63 chars. This bound on
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* length is enforced only by assertions, so caveat caller!
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* @param aBody the event handler function's body
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* @param aShared flag telling whether the compiled event handler will be
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* shared via nsIScriptEventHandlerOwner, in which case any static
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* link compiled into it based on aTarget should be cleared, both
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* to avoid entraining garbage to be collected, and to trigger static
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* link re-binding in BindCompiledEventHandler (see below).
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* @param aHandler the out parameter in which a void pointer to the compiled
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* function object is returned on success; may be null, meaning the
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* caller doesn't need to store the handler for later use.
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*
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* @return NS_OK if the function body was valid and got compiled
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*/
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NS_IMETHOD CompileEventHandler(void* aTarget,
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nsIAtom* aName,
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const nsString& aBody,
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PRBool aShared,
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void** aHandler) = 0;
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/**
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* Call the function object with given args and return its boolean result,
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* or true if the result isn't boolean.
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*
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* @param aTarget an object telling the scope in which to bind the compiled
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* event handler function.
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* @param aHandler function object (function and static scope) to invoke.
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* @param argc actual argument count; length of argv
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* @param argv vector of arguments; length is argc
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* @param aBoolResult out parameter returning boolean function result, or
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* true if the result was not boolean.
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**/
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NS_IMETHOD CallEventHandler(void* aTarget, void* aHandler,
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PRUint32 argc, void* argv,
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PRBool* aBoolResult) = 0;
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/**
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* Bind an already-compiled event handler function to a name in the given
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* scope object. The same restrictions on aName (lowercase ASCII, not too
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* long) applies here as for CompileEventHandler. Scripting languages with
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* static scoping must re-bind the scope chain for aHandler to begin (after
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* the activation scope for aHandler itself, typically) with aTarget's scope.
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*
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* @param aTarget an object telling the scope in which to bind the compiled
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* event handler function.
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* @param aName an nsIAtom pointer naming the function; it must be lowercase
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* and ASCII, and should not be longer than 63 chars. This bound on
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* length is enforced only by assertions, so caveat caller!
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* @param aHandler the function object to name, created by an earlier call to
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* CompileEventHandler
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* @return NS_OK if the function was successfully bound to the name
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*/
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NS_IMETHOD BindCompiledEventHandler(void* aTarget,
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nsIAtom* aName,
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void* aHandler) = 0;
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/**
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* Set the default scripting language version for this context, which must
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* be a context specific to a particular scripting language.
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*
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**/
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NS_IMETHOD SetDefaultLanguageVersion(const char* aVersion) = 0;
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/**
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* Return the global object.
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*
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**/
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NS_IMETHOD_(nsIScriptGlobalObject*) GetGlobalObject() = 0;
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/**
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* Return the native script context
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*
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**/
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NS_IMETHOD_(void*) GetNativeContext() = 0;
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/**
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* Init all DOM classes.
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*
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**/
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NS_IMETHOD InitClasses() = 0;
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/**
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* Init this context.
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*
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* @param aGlobalObject the gobal object
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*
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* @return NS_OK if context initialization was successful
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*
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**/
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NS_IMETHOD InitContext(nsIScriptGlobalObject *aGlobalObject) = 0;
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/**
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* Check to see if context is as yet intialized. Used to prevent
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* reentrancy issues during the initialization process.
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*
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* @return NS_OK if initialized, NS_COMFALSE if not
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*
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*/
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NS_IMETHOD IsContextInitialized() = 0;
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/**
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* Add a reference to a script object. For garbage collected systems
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* the address of a slot to be used as a root is also provided. For
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* reference counted systems, the object is provided.
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*
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* @param aSlot Slot to use as a root for garbage collected systems
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* @param aScriptObject Script object being referenced
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* @param aName Name of the reference (could be null)
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*
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* @return NS_OK if the method is successful
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*/
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NS_IMETHOD AddNamedReference(void *aSlot, void *aScriptObject,
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const char *aName) = 0;
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/**
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* Remove a reference to a script object. For garbage collected
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* systems, this is equivalent to removing a root.
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*
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* @param aSlot Slot corresponding to the removed root
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* @param aScriptObject script object to whom a reference is released
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*
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* @return NS_OK if the method is successful
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*/
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NS_IMETHOD RemoveReference(void *aSlot, void *aScriptObject) = 0;
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/**
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* For garbage collected systems, do a synchronous collection pass.
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* May be a no-op on other systems
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*
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* @return NS_OK if the method is successful
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*/
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NS_IMETHOD GC() = 0;
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/**
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* Get the name space manager for this context.
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* @return NS_OK if the method is successful
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*/
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NS_IMETHOD GetNameSpaceManager(nsIScriptNameSpaceManager** aInstancePtr) = 0;
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/**
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* Get the security manager for this context.
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* @return NS_OK if the method is successful
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*/
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NS_IMETHOD GetSecurityManager(nsIScriptSecurityManager** aInstancePtr) = 0;
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/**
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* Inform the context that a script was evaluated.
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* A GC may be done if "necessary."
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* This call is necessary if script evaluation is done
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* without using the EvaluateScript method.
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* @return NS_OK if the method is successful
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*/
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NS_IMETHOD ScriptEvaluated(void) = 0;
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/**
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* Let the script context know who its owner is.
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* The script context should not addref the owner. It
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* will be told when the owner goes away.
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* @return NS_OK if the method is successful
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*/
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NS_IMETHOD SetOwner(nsIScriptContextOwner* owner) = 0;
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/**
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* Get the script context of the owner. The method
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* addrefs the returned reference according to regular
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* XPCOM rules, even though the internal reference itself
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* is a "weak" reference.
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*/
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NS_IMETHOD GetOwner(nsIScriptContextOwner** owner) = 0;
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/**
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* Called to specify a function that should be called when the current
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* script (if there is one) terminates. Generally used if breakdown
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* of script state needs to be happen, but should be deferred till
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* the end of script evaluation.
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*/
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NS_IMETHOD SetTerminationFunction(nsScriptTerminationFunc aFunc,
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nsISupports* aRef) = 0;
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};
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/**
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* Return a new Context
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*
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*/
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extern "C" NS_DOM nsresult NS_CreateScriptContext(nsIScriptGlobalObject *aGlobal, nsIScriptContext **aContext);
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#endif // nsIScriptContext_h__
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