/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */

#include "nsISupports.idl"

[ptr] native nsAXPCNativeCallContextPtr(nsAXPCNativeCallContext);

%{C++
#include "js/TypeDecls.h"

class nsAXPCNativeCallContext;
%}

[ptr] native JSObjectPtr(JSObject);

[scriptable, uuid(4f94b21f-2920-4bd9-8251-5fb60fb054b2)]
interface xpcIJSModuleLoader : nsISupports
{
  /**
   * To be called from JavaScript only.
   *
   * Synchronously loads and evaluates the js file located at
   * aResourceURI with a new, fully privileged global object.
   *
   * If 'targetObj' is specified and equal to null, returns the
   * module's global object. Otherwise (if 'targetObj' is not
   * specified, or 'targetObj' is != null) looks for a property
   * 'EXPORTED_SYMBOLS' on the new global object. 'EXPORTED_SYMBOLS'
   * is expected to be an array of strings identifying properties on
   * the global object.  These properties will be installed as
   * properties on 'targetObj', or, if 'targetObj' is not specified,
   * on the caller's global object. If 'EXPORTED_SYMBOLS' is not
   * found, an error is thrown.
   *
   * @param resourceURI A resource:// URI string to load the module from.
   * @param targetObj  the object to install the exported properties on.
   *        If this parameter is a primitive value, this method throws
   *        an exception.
   * @returns the module code's global object.
   *
   * The implementation maintains a hash of registryLocation->global obj.
   * Subsequent invocations of importModule with 'registryLocation'
   * pointing to the same file will not cause the module to be re-evaluated,
   * but the symbols in EXPORTED_SYMBOLS will be exported into the
   * specified target object and the global object returned as above.
   *
   * (This comment is duplicated to nsIXPCComponents_Utils.)
   */
  [implicit_jscontext,optional_argc]
  jsval import(in AUTF8String aResourceURI, [optional] in jsval targetObj);

  /**
   * Imports the JS module at aResourceURI to the JS object
   * 'targetObj' (if != null) as described for importModule() and
   * returns the module's global object.
   */
  [noscript] JSObjectPtr importInto(in AUTF8String aResourceURI,
                                    in JSObjectPtr targetObj,
                                    in nsAXPCNativeCallContextPtr cc);

  /**
   * Unloads the JS module at aResourceURI. Existing references to the module
   * will continue to work but any subsequent import of the module will
   * reload it and give new reference. If the JS module hasn't yet been imported
   * then this method will do nothing.
   */
  void unload(in AUTF8String aResourceURI);

  /**
   * Returns true if the js file located at 'registryLocation' location has
   * been loaded previously via the import method above. Returns false
   * otherwise.
   *
   * @param resourceURI A resource:// URI string representing the location of
   *        the js file to be checked if it is already loaded or not.
   * @returns boolean, true if the js file has been loaded via import. false
   *          otherwise
   */
  boolean isModuleLoaded(in AUTF8String aResourceURI);
};
