gecko/dom/base/ConsoleAPI.js

/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla 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/MPL/
 *
 * 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 Console API code.
 *
 * The Initial Developer of the Original Code is Mozilla Foundation
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *  David Dahl <ddahl@mozilla.com>  (Original Author)
 *  Ryan Flint <rflint@mozilla.com>
 *  Rob Campbell <rcampbell@mozilla.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

let Cu = Components.utils;
let Ci = Components.interfaces;
let Cc = Components.classes;

Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/Services.jsm");

function ConsoleAPI() {}
ConsoleAPI.prototype = {

  classID: Components.ID("{b49c18f8-3379-4fc0-8c90-d7772c1a9ff3}"),

  QueryInterface: XPCOMUtils.generateQI([Ci.nsIDOMGlobalPropertyInitializer]),

  // nsIDOMGlobalPropertyInitializer
  init: function CA_init(aWindow) {
    let id;
    try {
      id = aWindow.QueryInterface(Ci.nsIInterfaceRequestor)
                  .getInterface(Ci.nsIDOMWindowUtils)
                  .outerWindowID;
    } catch (ex) {
      Cu.reportError(ex);
    }

    let self = this;
    let chromeObject = {
      // window.console API
      log: function CA_log() {
        self.notifyObservers(id, "log", arguments);
      },
      info: function CA_info() {
        self.notifyObservers(id, "info", arguments);
      },
      warn: function CA_warn() {
        self.notifyObservers(id, "warn", arguments);
      },
      error: function CA_error() {
        self.notifyObservers(id, "error", arguments);
      },
      __exposedProps__: {
        log: "r",
        info: "r",
        warn: "r",
        error: "r"
      }
    };

    // We need to return an actual content object here, instead of a wrapped
    // chrome object. This allows things like console.log.bind() to work.
    let sandbox = Cu.Sandbox(aWindow);
    let contentObject = Cu.evalInSandbox(
        "(function(x) {\
          var bind = Function.bind;\
          var obj = {\
            log: bind.call(x.log, x),\
            info: bind.call(x.info, x),\
            warn: bind.call(x.warn, x),\
            error: bind.call(x.error, x),\
            __noSuchMethod__: function() {}\
          };\
          Object.defineProperty(obj, '__mozillaConsole__', { value: true });\
          return obj;\
        })", sandbox)(chromeObject);

      return contentObject;
  },

  /**
   * Notify all observers of any console API call
   **/
  notifyObservers: function CA_notifyObservers(aID, aLevel, aArguments) {
    if (!aID)
      return;

    let consoleEvent = {
      ID: aID,
      level: aLevel,
      arguments: aArguments
    };

    consoleEvent.wrappedJSObject = consoleEvent;

    Services.obs.notifyObservers(consoleEvent,
                                 "console-api-log-event", aID);
  }
};

let NSGetFactory = XPCOMUtils.generateNSGetFactory([ConsoleAPI]);