pjs/dom/public/nsIScriptContext.h

/* -*- 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 aObj 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 *aObj,
                            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;

  NS_IMETHOD CompileFunction(void *aObj, nsIAtom *aName,
                             const nsString& aBody) = 0;

  NS_IMETHOD CallFunction(void *aObj, void *aFunction, 
                          PRUint32 argc, void *argv, 
                          PRBool *aBoolResult) = 0;

  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__