/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- *//* vim:set ts=2 sw=2 sts=2 ci et: */

/* ***** 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 the Places Bookmark Properties.
 *
 * The Initial Developer of the Original Code is Google Inc.
 * Portions created by the Initial Developer are Copyright (C) 2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Joe Hughes <jhughes@google.com>
 *   Ben Goodger <beng@google.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 ***** */

/**
 * This file contains functions that are useful for debugging purposes from
 * within JavaScript code.
 */

const NS_ASSERT_ENVIRONMENT_VARIABLE_NAME = "XUL_ASSERT_PROMPT";
var gTraceOnAssert = true;

/**
 * This function provides a simple assertion function for JavaScript.
 * If the condition is true, this function will do nothing.  If the
 * condition is false, then the message will be printed to the console
 * and an alert will appear showing a stack trace, so that the (alpha
 * or nightly) user can file a bug containing it.  For future enhancements, 
 * see bugs 330077 and 330078.
 *
 * To suppress the dialogs, you can run with the environment variable
 * XUL_ASSERT_PROMPT set to 0 (if unset, this defaults to 1).
 *
 * @param condition represents the condition that we're asserting to be
 *                  true when we call this function--should be
 *                  something that can be evaluated as a boolean.
 * @param message   a string to be displayed upon failure of the assertion
 */

function NS_ASSERT(condition, message) {
  if (condition)
    return;

  var caller = arguments.callee.caller;
  var assertionText = "ASSERT: " + message + "\n";
  dump(assertionText);

  if (gTraceOnAssert) {
    var stackText = "Stack Trace: \n";
    var count = 0;
    while (caller) {
      stackText += count++ + ":" + caller.name + "(";
      for (var i = 0; i < caller.arguments.length; ++i) {
        var arg = caller.arguments[i];
        stackText += arg;
        if (i < caller.arguments.length - 1)
          stackText += ",";
      }
      stackText += ")\n";
      caller = caller.arguments.callee.caller;
    }
  }

  var environment = Components.classes["@mozilla.org/process/environment;1"].
                               getService(Components.interfaces.nsIEnvironment);
  if (environment.exists(NS_ASSERT_ENVIRONMENT_VARIABLE_NAME) &&
      !parseInt(environment.get(NS_ASSERT_ENVIRONMENT_VARIABLE_NAME)))
    return;

  var source = null;
  if (this.window)
    source = window;
  var ps = Components.classes["@mozilla.org/embedcomp/prompt-service;1"].
                      getService(Components.interfaces.nsIPromptService);
  ps.alert(source, "Assertion Failed", assertionText + stackText);

}