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console.js
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2001-02-14
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/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
var bundle;
/*
* Functions for initializing and updating the JavaScript Console.
*/
/*
* Listener to be registered with the console service, called on new errors.
*/
var consoleListener = {
observe : function(messageObject) {
appendMessage(messageObject);
}
}
/*
* Keeps the number of errors to prevent leak
*/
var num_errors=0;
/*
* Gets the current context of the console service and dumps it to the window,
* and registers a listener with the service to be called on additional errors.
*/
function onLoadJSConsole()
{
try {
var cs_class = Components.classes['@mozilla.org/consoleservice;1'];
var cs_iface = Components.interfaces.nsIConsoleService;
var cs_isupports = cs_class.getService();
var cs = cs_isupports.QueryInterface(cs_iface);
} catch(exn) {
// Couldn't get the console service for some reason...
// pretend it never happened.
appendMessage({ message:
"Unable to display errors - " +
"couldn't get Console Service component. " +
"(Missing @mozilla.org/consoleservice;1)" });
return;
}
var o1 = {}; // Throwaway references to support 'out' parameters.
var o2 = {};
var messages;
cs.getMessageArray(o1, o2);
messages = o1.value;
// In case getMessageArray returns 0-length array as null.
if (messages == null)
messages = [];
var i;
var cleared=0;
//Checks if console ever been cleared
for (i = messages.length-1; i >=0 ; i--) {
if (messages[i].message == "__CLEAR__") {
cleared = i + 1;
break;
}
}
//Populates tree with error messages after latest "clear"
for(i = cleared; i < messages.length; i++) {
appendMessage(messages[i]);
}
cs.registerListener(consoleListener);
bundle = srGetStrBundle("chrome://global/locale/console.properties");
return true;
}
function onUnloadJSConsole()
{
// keep a global ref. to it instead???
try {
var cs_class = Components.classes['@mozilla.org/consoleservice;1'];
var cs_iface = Components.interfaces.nsIConsoleService;
var cs_isupports = cs_class.getService();
var cs = cs_isupports.QueryInterface(cs_iface);
} catch(exn) {
// Couldn't get the console service for some reason...
// pretend it never happened.
return;
}
cs.unregisterListener(consoleListener);
return true;
}
gErrorCount = 0;
gWarningCount = 0;
/*
* Given a message, write it to the page.
*
* TODO: (When interesting subclasses of message objects become available) -
* reflect structure of messages (e.g. lineno, etc.) as CSS-decorable structure.
*/
function appendMessage(messageObject)
{
if(messageObject.message == "__CLEAR__") {return;}
var c = document.getElementById("consoleTreeChildren");
var item = document.createElement("treeitem");
var row = document.createElement("treerow");
var cell = document.createElement("treecell");
cell.setAttribute("class", "treecell-error");
var msgContent;
var text;
try {
// Try to QI it to a script error to get more info.
var nsIScriptError = Components.interfaces.nsIScriptError;
var scriptError =
messageObject.QueryInterface(nsIScriptError);
// Is this error actually just a non-fatal warning?
var warning = scriptError.flags & nsIScriptError.warningFlag != 0;
// Is this error or warning a result of JavaScript's strict mode,
// and therefore something we might decide to be lenient about?
var strict = scriptError.flags & nsIScriptError.strictFlag != 0;
// If true, this error led to the creation of a (catchable!) javascript
// exception, and should probably be ignored.
// This is worth checking, as I'm not sure how the behavior falls
// out. Does an uncaught exception result in this flag being raised?
var isexn = scriptError.flags & nsIScriptError.exceptionFlag != 0;
/*
* It'd be nice to do something graphical with our column information,
* like what the old js console did, and the js shell does:
* js> var scooby = "I am an unterminated string!
* 1: unterminated string literal:
* 1: var scooby = "I am an unterminated string!
* 1: .............^
*
* But for now, I'm just pushing it out the door.
*/
cell.setAttribute("type", warning ? "warning" : "error");
// XXX localize
cell.setAttribute("typetext", warning ? "Warning: " : "Error: ");
cell.setAttribute("url", scriptError.sourceName);
cell.setAttribute("line", scriptError.lineNumber);
cell.setAttribute("col", scriptError.columnNumber);
cell.setAttribute("msg", scriptError.message);
cell.setAttribute("error", scriptError.sourceLine);
} catch (exn) {
// dump(exn + '\n');
// QI failed, just try to treat it as an nsIConsoleMessage
cell.setAttribute("msg", messageObject.message);
}
row.appendChild(cell);
item.appendChild(row);
c.appendChild(item);
/*
var warningBroadcaster = document.getElementById("Console:ShowWarnings");
var errorBroadcaster = document.getElementById("Console:ShowErrors");
var allBroadcaster = document.getElementById("Console:ShowAll");
if (warning) gWarningCount++;
else gErrorCount++;
warningBroadcaster.setAttribute("value",
(bundle.GetStringFromName("warningsLabel") + " (" + gWarningCount + ")"));
errorBroadcaster.setAttribute("value",
(bundle.GetStringFromName("errorsLabel") + " (" + gErrorCount + ")"));
allBroadcaster.setAttribute("value",
(bundle.GetStringFromName("allMsgsLabel") + " (" + (gErrorCount + gWarningCount) + ")"));
*/
num_errors++;
//Deletes top error if error console is long
if(num_errors>250) { deleteOne(); }
}
function changeMode (aMode, aElement)
{
var broadcaster = document.getElementById(aElement.getAttribute("observes"));
var bcset = document.getElementById("broadcasterset");
var tree = document.getElementById("console");
switch (aMode) {
case "clear":
clear();
return;
case "errors":
tree.setAttribute("mode", "errors");
break;
case "warnings":
tree.setAttribute("mode", "warnings");
break;
default:
case "all":
tree.removeAttribute("mode");
break;
}
for (var i = 0; i < bcset.childNodes.length; i++) {
bcset.childNodes[i].removeAttribute("toggled");
bcset.childNodes[i].removeAttribute("checked");
}
broadcaster.setAttribute("toggled", "true");
broadcaster.setAttribute("checked", "true");
}
/*
* If clear selected, __CLEAR__ message is logged to service and window cleared
* When console next run, will only list messages after the latest"__CLEAR__"
* message.
*/
function clear ()
{
try {
var cs_class = Components.classes['@mozilla.org/consoleservice;1'];
var cs_iface = Components.interfaces.nsIConsoleService;
var cs_isupports = cs_class.getService();
var cs = cs_isupports.QueryInterface(cs_iface);
} catch(exn) {
// Couldn't get the console service for some reason...
// pretend it never happened.
return;
}
cs.logStringMessage("__CLEAR__");
var tree = document.getElementById("console");
var treeChildren = document.getElementById("consoleTreeChildren");
tree.removeChild(treeChildren);
treeChildren = document.createElement ("treechildren");
treeChildren.setAttribute ("id", "consoleTreeChildren");
treeChildren.setAttribute ("flex", "1");
tree.appendChild(treeChildren);
num_errors=0;
return true;
}
/*
* Used to help prevent too much memory allocation by JS console
* Deletes the top-most node
*/
function deleteOne ()
{
var tree = document.getElementById("consoleTreeChildren");
var node = tree.firstChild;
tree.removeChild(node);
num_errors--;
return true;
}