1 files changed, 96 insertions, 0 deletions
diff --git a/testing/mochitest/tests/SimpleTest/LogController.js b/testing/mochitest/tests/SimpleTest/LogController.js
new file mode 100644
index 0000000000..059abdcd9b
--- /dev/null
+++ b/testing/mochitest/tests/SimpleTest/LogController.js
@@ -0,0 +1,96 @@
+/* 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/. */
+
+var LogController = {}; //create the logger object
+
+LogController.counter = 0; //current log message number
+LogController.listeners = [];
+LogController.logLevel = {
+  FATAL: 50,
+  ERROR: 40,
+  WARNING: 30,
+  INFO: 20,
+  DEBUG: 10,
+};
+
+/* set minimum logging level */
+LogController.logLevelAtLeast = function(minLevel) {
+  if (typeof minLevel == "string") {
+    minLevel = LogController.logLevel[minLevel];
+  }
+  return function(msg) {
+    var msgLevel = msg.level;
+    if (typeof msgLevel == "string") {
+      msgLevel = LogController.logLevel[msgLevel];
+    }
+    return msgLevel >= minLevel;
+  };
+};
+
+/* creates the log message with the given level and info */
+LogController.createLogMessage = function(level, info) {
+  var msg = {};
+  msg.num = LogController.counter;
+  msg.level = level;
+  msg.info = info;
+  msg.timestamp = new Date();
+  return msg;
+};
+
+/* helper method to return a sub-array */
+LogController.extend = function(args, skip) {
+  var ret = [];
+  for (var i = skip; i < args.length; i++) {
+    ret.push(args[i]);
+  }
+  return ret;
+};
+
+/* logs message with given level. Currently used locally by log() and error() */
+LogController.logWithLevel = function(level, message /*, ...*/) {
+  var msg = LogController.createLogMessage(
+    level,
+    LogController.extend(arguments, 1)
+  );
+  LogController.dispatchListeners(msg);
+  LogController.counter += 1;
+};
+
+/* log with level INFO */
+LogController.log = function(message /*, ...*/) {
+  LogController.logWithLevel("INFO", message);
+};
+
+/* log with level ERROR */
+LogController.error = function(message /*, ...*/) {
+  LogController.logWithLevel("ERROR", message);
+};
+
+/* send log message to listeners */
+LogController.dispatchListeners = function(msg) {
+  for (var k in LogController.listeners) {
+    var pair = LogController.listeners[k];
+    if (pair.ident != k || (pair[0] && !pair[0](msg))) {
+      continue;
+    }
+    pair[1](msg);
+  }
+};
+
+/* add a listener to this log given an identifier, a filter (can be null) and the listener object */
+LogController.addListener = function(ident, filter, listener) {
+  if (typeof filter == "string") {
+    filter = LogController.logLevelAtLeast(filter);
+  } else if (filter !== null && typeof filter !== "function") {
+    throw new Error("Filter must be a string, a function, or null");
+  }
+  var entry = [filter, listener];
+  entry.ident = ident;
+  LogController.listeners[ident] = entry;
+};
+
+/* remove a listener from this log */
+LogController.removeListener = function(ident) {
+  delete LogController.listeners[ident];
+};