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91 lines
3.0 KiB
JavaScript
91 lines
3.0 KiB
JavaScript
/* vim:set ts=2 sw=2 sts=2 ci et: */
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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// This file contains functions that are useful for debugging purposes from
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// within JavaScript code.
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this.EXPORTED_SYMBOLS = ["NS_ASSERT"];
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var gTraceOnAssert = true;
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/**
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* This function provides a simple assertion function for JavaScript.
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* If the condition is true, this function will do nothing. If the
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* condition is false, then the message will be printed to the console
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* and an alert will appear showing a stack trace, so that the (alpha
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* or nightly) user can file a bug containing it. For future enhancements,
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* see bugs 330077 and 330078.
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*
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* To suppress the dialogs, you can run with the environment variable
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* XUL_ASSERT_PROMPT set to 0 (if unset, this defaults to 1).
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*
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* @param condition represents the condition that we're asserting to be
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* true when we call this function--should be
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* something that can be evaluated as a boolean.
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* @param message a string to be displayed upon failure of the assertion
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*/
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this.NS_ASSERT = function NS_ASSERT(condition, message) {
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if (condition)
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return;
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var releaseBuild = true;
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var defB = Components.classes["@mozilla.org/preferences-service;1"]
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.getService(Components.interfaces.nsIPrefService)
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.getDefaultBranch(null);
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try {
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switch (defB.getCharPref("app.update.channel")) {
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case "nightly":
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case "beta":
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case "default":
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releaseBuild = false;
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}
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} catch(ex) {}
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var caller = arguments.callee.caller;
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var assertionText = "ASSERT: " + message + "\n";
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if (releaseBuild) {
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// Just report the error to the console
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Components.utils.reportError(assertionText);
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return;
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}
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// Otherwise, dump to stdout and launch an assertion failure dialog
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dump(assertionText);
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var stackText = "";
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if (gTraceOnAssert) {
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stackText = "Stack Trace: \n";
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var count = 0;
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while (caller) {
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stackText += count++ + ":" + caller.name + "(";
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for (var i = 0; i < caller.arguments.length; ++i) {
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var arg = caller.arguments[i];
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stackText += arg;
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if (i < caller.arguments.length - 1)
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stackText += ",";
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}
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stackText += ")\n";
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caller = caller.arguments.callee.caller;
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}
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}
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var environment = Components.classes["@mozilla.org/process/environment;1"].
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getService(Components.interfaces.nsIEnvironment);
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if (environment.exists("XUL_ASSERT_PROMPT") &&
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!parseInt(environment.get("XUL_ASSERT_PROMPT")))
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return;
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var source = null;
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if (this.window)
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source = this.window;
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var ps = Components.classes["@mozilla.org/embedcomp/prompt-service;1"].
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getService(Components.interfaces.nsIPromptService);
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ps.alert(source, "Assertion Failed", assertionText + stackText);
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}
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