Initial commit.

js/util/Timer.js

@@ -0,0 +1,60 @@
+// Copyright (C) 2013 Massachusetts Institute of Technology
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License version 2,
+// as published by the Free Software Foundation.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+/*
+*  Timer for the interpeter and performance testing
+*  Tim Mickel, July 2011
+*/
+var Timer = function() {
+    var trials = [];
+    var last_trial = 0;
+    var start_time = 0;
+}
+
+Timer.prototype.time = function() {
+    return (new Date()).getTime();
+}
+
+Timer.prototype.start = function() {
+    start_time = this.time();
+}
+
+Timer.prototype.stop = function() {
+    end = this.time();
+    last_trial = end - start_time;
+    trials.push(last_trial);
+}
+
+Timer.prototype.count = function() {
+    return trials.length;
+}
+
+Timer.prototype.average = function() {
+    sum = 0;
+    for(i = 0; i < this.count(); i++) {
+        sum += trials[i];
+    }
+    return sum / this.count();
+}
+
+Timer.prototype.print = function(element) {
+    text = "Trial: " + last_trial + "ms" + 
+           "<br />\nTrials: " + this.count() + ", Avg: " + this.average() + "ms";
+    if(element) {
+        $(element).html(text);
+    } else {
+        console.log(text);
+    }
+}