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356 lines
14 KiB
C++
356 lines
14 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* 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
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998-1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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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#include "nsCOMPtr.h"
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#include "jsapi.h"
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class nsIScriptGlobalObject;
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class nsIScriptSecurityManager;
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class nsIScriptContextOwner;
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class nsIPrincipal;
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class nsIAtom;
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typedef void (*nsScriptTerminationFunc)(nsISupports* aRef);
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#define NS_ISCRIPTCONTEXT_IID \
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{ /* b3fd8821-b46d-4160-913f-cc8fe8176f5f */ \
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0xb3fd8821, 0xb46d, 0x4160, \
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{0x91, 0x3f, 0xcc, 0x8f, 0xe8, 0x17, 0x6f, 0x5f} }
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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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{
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public:
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NS_DEFINE_STATIC_IID_ACCESSOR(NS_ISCRIPTCONTEXT_IID)
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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 of 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, or null for no result
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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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virtual nsresult EvaluateString(const nsAString& 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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nsAString *aRetValue,
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PRBool* aIsUndefined) = 0;
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virtual nsresult EvaluateStringWithValue(const nsAString& 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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void* 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 of 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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virtual nsresult 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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virtual nsresult ExecuteScript(void* aScriptObject,
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void* aScopeObject,
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nsAString* 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 aEventName the name that the event object should be bound to
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* @param aBody the event handler function's body
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* @param aURL the URL or filename for error messages
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* @param aLineNo the starting line number of the script for error messages
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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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virtual nsresult CompileEventHandler(void* aTarget,
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nsIAtom* aName,
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const char* aEventName,
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const nsAString& aBody,
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const char* aURL,
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PRUint32 aLineNo,
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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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virtual nsresult CallEventHandler(JSObject* aTarget, JSObject* aHandler,
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uintN argc, jsval* argv,
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jsval* rval) = 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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virtual nsresult BindCompiledEventHandler(void* aTarget,
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nsIAtom* aName,
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void* aHandler) = 0;
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virtual nsresult CompileFunction(void* aTarget,
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const nsACString& aName,
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PRUint32 aArgCount,
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const char** aArgArray,
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const nsAString& aBody,
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const char* aURL,
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PRUint32 aLineNo,
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PRBool aShared,
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void** aFunctionObject) = 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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virtual void 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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virtual 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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virtual void *GetNativeContext() = 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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virtual nsresult 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 PR_TRUE if initialized, PR_FALSE if not
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*
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*/
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virtual PRBool IsContextInitialized() = 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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virtual void GC() = 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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* @param aTerminated If true then call termination function if it was
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* previously set. Within DOM this will always be true, but outside
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* callers (such as xpconnect) who may do script evaluations nested
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* inside DOM script evaluations can pass false to avoid premature
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* calls to the termination function.
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* @return NS_OK if the method is successful
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*/
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virtual void ScriptEvaluated(PRBool aTerminated) = 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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virtual void 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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virtual nsIScriptContextOwner *GetOwner() = 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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virtual void SetTerminationFunction(nsScriptTerminationFunc aFunc,
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nsISupports* aRef) = 0;
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/**
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* Called to disable/enable script execution in this context.
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*/
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virtual PRBool GetScriptsEnabled() = 0;
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virtual void SetScriptsEnabled(PRBool aEnabled, PRBool aFireTimeouts) = 0;
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/**
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* Called to set/get information if the script context is
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* currently processing a script tag
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*/
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virtual PRBool GetProcessingScriptTag() = 0;
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virtual void SetProcessingScriptTag(PRBool aResult) = 0;
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/**
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* Tell the context whether or not to GC when destroyed.
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*/
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virtual void SetGCOnDestruction(PRBool aGCOnDestruction) = 0;
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};
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inline nsIScriptContext *
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GetScriptContextFromJSContext(JSContext *cx)
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{
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if (!(::JS_GetOptions(cx) & JSOPTION_PRIVATE_IS_NSISUPPORTS)) {
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return nsnull;
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}
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nsCOMPtr<nsIScriptContext> scx =
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do_QueryInterface(NS_STATIC_CAST(nsISupports *,
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::JS_GetContextPrivate(cx)));
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// This will return a pointer to something that's about to be
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// released, but that's ok here.
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return scx;
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}
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#endif // nsIScriptContext_h__
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