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/* vim:set ts=2 sw=2 sts=2 ci et: */
/* -*- Mode: Java; 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/. */
// This file contains functions that are useful for debugging purposes from
// within JavaScript code.
this.EXPORTED_SYMBOLS = ["NS_ASSERT"];
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
*/
this.NS_ASSERT = function NS_ASSERT(condition, message) {
if (condition)
return;
var releaseBuild = true;
var defB = Components.classes["@mozilla.org/preferences-service;1"]
.getService(Components.interfaces.nsIPrefService)
.getDefaultBranch(null);
try {
switch (defB.getCharPref("app.update.channel")) {
case "nightly":
case "aurora":
case "beta":
case "default":
releaseBuild = false;
}
} catch (ex) {}
var caller = arguments.callee.caller;
var assertionText = "ASSERT: " + message + "\n";
// Report the error to the console
Components.utils.reportError(assertionText);
if (releaseBuild) {
return;
}
// dump the stack to stdout too in non-release builds
var stackText = "";
if (gTraceOnAssert) {
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;
}
}
dump(assertionText + stackText);
}
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