(function() {
  var ajaxmonitor, bar, documentmonitor, elementmonitor, elementtracker, eventlagmonitor, evented, events, notargeterror, requestintercept, source_keys, scaler, socketrequesttracker, xhrrequesttracker, animation, avgamplitude, bar, cancelanimation, cancelanimationframe, defaultoptions, extend, extendnative, getfromdom, getintercept, handlepushstate, ignorestack, init, now, options, requestanimationframe, result, runanimation, scalers, shouldignoreurl, shouldtrack, source, sources, uniscaler, _websocket, _xdomainrequest, _xmlhttprequest, _i, _intercept, _len, _pushstate, _ref, _ref1, _replacestate,
    __slice = [].slice,
    __hasprop = {}.hasownproperty,
    __extends = function(child, parent) { for (var key in parent) { if (__hasprop.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
    __indexof = [].indexof || function(item) { for (var i = 0, l = this.length; i < l; i++) { if (i in this && this[i] === item) return i; } return -1; };

  defaultoptions = {
    catchuptime: 500,
    initialrate: .03,
    mintime: 500,
    ghosttime: 500,
    maxprogressperframe: 10,
    easefactor: 1.25,
    startonpageload: true,
    restartonpushstate: true,
    restartonrequestafter: 500,
    target: 'body',
    elements: {
      checkinterval: 100,
      selectors: ['body']
    },
    eventlag: {
      minsamples: 10,
      samplecount: 3,
      lagthreshold: 3
    },
    ajax: {
      trackmethods: ['get'],
      trackwebsockets: true,
      ignoreurls: []
    }
  };

  now = function() {
    var _ref;
    return (_ref = typeof performance !== "undefined" && performance !== null ? typeof performance.now === "function" ? performance.now() : void 0 : void 0) != null ? _ref : +(new date);
  };

  requestanimationframe = window.requestanimationframe || window.mozrequestanimationframe || window.webkitrequestanimationframe || window.msrequestanimationframe;

  cancelanimationframe = window.cancelanimationframe || window.mozcancelanimationframe;

  if (requestanimationframe == null) {
    requestanimationframe = function(fn) {
      return settimeout(fn, 50);
    };
    cancelanimationframe = function(id) {
      return cleartimeout(id);
    };
  }

  runanimation = function(fn) {
    var last, tick;
    last = now();
    tick = function() {
      var diff;
      diff = now() - last;
      if (diff >= 33) {
        last = now();
        return fn(diff, function() {
          return requestanimationframe(tick);
        });
      } else {
        return settimeout(tick, 33 - diff);
      }
    };
    return tick();
  };

  result = function() {
    var args, key, obj;
    obj = arguments[0], key = arguments[1], args = 3 <= arguments.length ? __slice.call(arguments, 2) : [];
    if (typeof obj[key] === 'function') {
      return obj[key].apply(obj, args);
    } else {
      return obj[key];
    }
  };

  extend = function() {
    var key, out, source, sources, val, _i, _len;
    out = arguments[0], sources = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
    for (_i = 0, _len = sources.length; _i < _len; _i++) {
      source = sources[_i];
      if (source) {
        for (key in source) {
          if (!__hasprop.call(source, key)) continue;
          val = source[key];
          if ((out[key] != null) && typeof out[key] === 'object' && (val != null) && typeof val === 'object') {
            extend(out[key], val);
          } else {
            out[key] = val;
          }
        }
      }
    }
    return out;
  };

  avgamplitude = function(arr) {
    var count, sum, v, _i, _len;
    sum = count = 0;
    for (_i = 0, _len = arr.length; _i < _len; _i++) {
      v = arr[_i];
      sum += math.abs(v);
      count++;
    }
    return sum / count;
  };

  getfromdom = function(key, json) {
    var data, e, el;
    if (key == null) {
      key = 'options';
    }
    if (json == null) {
      json = true;
    }
    el = document.queryselector("[data-pace-" + key + "]");
    if (!el) {
      return;
    }
    data = el.getattribute("data-pace-" + key);
    if (!json) {
      return data;
    }
    try {
      return json.parse(data);
    } catch (_error) {
      e = _error;
      return typeof console !== "undefined" && console !== null ? console.error("error parsing inline pace options", e) : void 0;
    }
  };

  evented = (function() {
    function evented() {}

    evented.prototype.on = function(event, handler, ctx, once) {
      var _base;
      if (once == null) {
        once = false;
      }
      if (this.bindings == null) {
        this.bindings = {};
      }
      if ((_base = this.bindings)[event] == null) {
        _base[event] = [];
      }
      return this.bindings[event].push({
        handler: handler,
        ctx: ctx,
        once: once
      });
    };

    evented.prototype.once = function(event, handler, ctx) {
      return this.on(event, handler, ctx, true);
    };

    evented.prototype.off = function(event, handler) {
      var i, _ref, _results;
      if (((_ref = this.bindings) != null ? _ref[event] : void 0) == null) {
        return;
      }
      if (handler == null) {
        return delete this.bindings[event];
      } else {
        i = 0;
        _results = [];
        while (i < this.bindings[event].length) {
          if (this.bindings[event][i].handler === handler) {
            _results.push(this.bindings[event].splice(i, 1));
          } else {
            _results.push(i++);
          }
        }
        return _results;
      }
    };

    evented.prototype.trigger = function() {
      var args, ctx, event, handler, i, once, _ref, _ref1, _results;
      event = arguments[0], args = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
      if ((_ref = this.bindings) != null ? _ref[event] : void 0) {
        i = 0;
        _results = [];
        while (i < this.bindings[event].length) {
          _ref1 = this.bindings[event][i], handler = _ref1.handler, ctx = _ref1.ctx, once = _ref1.once;
          handler.apply(ctx != null ? ctx : this, args);
          if (once) {
            _results.push(this.bindings[event].splice(i, 1));
          } else {
            _results.push(i++);
          }
        }
        return _results;
      }
    };

    return evented;

  })();

  if (window.pace == null) {
    window.pace = {};
  }

  extend(pace, evented.prototype);

  options = pace.options = extend({}, defaultoptions, window.paceoptions, getfromdom());

  _ref = ['ajax', 'document', 'eventlag', 'elements'];
  for (_i = 0, _len = _ref.length; _i < _len; _i++) {
    source = _ref[_i];
    if (options[source] === true) {
      options[source] = defaultoptions[source];
    }
  }

  notargeterror = (function(_super) {
    __extends(notargeterror, _super);

    function notargeterror() {
      _ref1 = notargeterror.__super__.constructor.apply(this, arguments);
      return _ref1;
    }

    return notargeterror;

  })(error);

  bar = (function() {
    function bar() {
      this.progress = 0;
    }

    bar.prototype.getelement = function() {
      var targetelement;
      if (this.el == null) {
        targetelement = document.queryselector(options.target);
        if (!targetelement) {
          throw new notargeterror;
        }
        this.el = document.createelement('div');
        this.el.classname = "pace pace-active";
        document.body.classname = document.body.classname.replace(/pace-done/g, '');
        document.body.classname += ' pace-running';
        this.el.innerhtml = '<div class="pace-progress">\n  <div class="pace-progress-inner"></div>\n</div>\n<div class="pace-activity"></div>';
        if (targetelement.firstchild != null) {
          targetelement.insertbefore(this.el, targetelement.firstchild);
        } else {
          targetelement.appendchild(this.el);
        }
      }
      return this.el;
    };

    bar.prototype.finish = function() {
      var el;
      el = this.getelement();
      el.classname = el.classname.replace('pace-active', '');
      el.classname += ' pace-inactive';
      document.body.classname = document.body.classname.replace('pace-running', '');
      return document.body.classname += ' pace-done';
    };

    bar.prototype.update = function(prog) {
      this.progress = prog;
      return this.render();
    };

    bar.prototype.destroy = function() {
      try {
        this.getelement().parentnode.removechild(this.getelement());
      } catch (_error) {
        notargeterror = _error;
      }
      return this.el = void 0;
    };

    bar.prototype.render = function() {
      var el, progressstr;
      if (document.queryselector(options.target) == null) {
        return false;
      }
      el = this.getelement();
      el.children[0].style.width = "" + this.progress + "%";
      if (!this.lastrenderedprogress || this.lastrenderedprogress | 0 !== this.progress | 0) {
        el.children[0].setattribute('data-progress-text', "" + (this.progress | 0) + "%");
        if (this.progress >= 100) {
          progressstr = '99';
        } else {
          progressstr = this.progress < 10 ? "0" : "";
          progressstr += this.progress | 0;
        }
        el.children[0].setattribute('data-progress', "" + progressstr);
      }
      return this.lastrenderedprogress = this.progress;
    };

    bar.prototype.done = function() {
      return this.progress >= 100;
    };

    return bar;

  })();

  events = (function() {
    function events() {
      this.bindings = {};
    }

    events.prototype.trigger = function(name, val) {
      var binding, _j, _len1, _ref2, _results;
      if (this.bindings[name] != null) {
        _ref2 = this.bindings[name];
        _results = [];
        for (_j = 0, _len1 = _ref2.length; _j < _len1; _j++) {
          binding = _ref2[_j];
          _results.push(binding.call(this, val));
        }
        return _results;
      }
    };

    events.prototype.on = function(name, fn) {
      var _base;
      if ((_base = this.bindings)[name] == null) {
        _base[name] = [];
      }
      return this.bindings[name].push(fn);
    };

    return events;

  })();

  _xmlhttprequest = window.xmlhttprequest;

  _xdomainrequest = window.xdomainrequest;

  _websocket = window.websocket;

  extendnative = function(to, from) {
    var e, key, val, _results;
    _results = [];
    for (key in from.prototype) {
      try {
        val = from.prototype[key];
        if ((to[key] == null) && typeof val !== 'function') {
          _results.push(to[key] = val);
        } else {
          _results.push(void 0);
        }
      } catch (_error) {
        e = _error;
      }
    }
    return _results;
  };

  ignorestack = [];

  pace.ignore = function() {
    var args, fn, ret;
    fn = arguments[0], args = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
    ignorestack.unshift('ignore');
    ret = fn.apply(null, args);
    ignorestack.shift();
    return ret;
  };

  pace.track = function() {
    var args, fn, ret;
    fn = arguments[0], args = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
    ignorestack.unshift('track');
    ret = fn.apply(null, args);
    ignorestack.shift();
    return ret;
  };

  shouldtrack = function(method) {
    var _ref2;
    if (method == null) {
      method = 'get';
    }
    if (ignorestack[0] === 'track') {
      return 'force';
    }
    if (!ignorestack.length && options.ajax) {
      if (method === 'socket' && options.ajax.trackwebsockets) {
        return true;
      } else if (_ref2 = method.touppercase(), __indexof.call(options.ajax.trackmethods, _ref2) >= 0) {
        return true;
      }
    }
    return false;
  };

  requestintercept = (function(_super) {
    __extends(requestintercept, _super);

    function requestintercept() {
      var monitorxhr,
        _this = this;
      requestintercept.__super__.constructor.apply(this, arguments);
      monitorxhr = function(req) {
        var _open;
        _open = req.open;
        return req.open = function(type, url, async) {
          if (shouldtrack(type)) {
            _this.trigger('request', {
              type: type,
              url: url,
              request: req
            });
          }
          return _open.apply(req, arguments);
        };
      };
      window.xmlhttprequest = function(flags) {
        var req;
        req = new _xmlhttprequest(flags);
        monitorxhr(req);
        return req;
      };
      try {
        extendnative(window.xmlhttprequest, _xmlhttprequest);
      } catch (_error) {}
      if (_xdomainrequest != null) {
        window.xdomainrequest = function() {
          var req;
          req = new _xdomainrequest;
          monitorxhr(req);
          return req;
        };
        try {
          extendnative(window.xdomainrequest, _xdomainrequest);
        } catch (_error) {}
      }
      if ((_websocket != null) && options.ajax.trackwebsockets) {
        window.websocket = function(url, protocols) {
          var req;
          if (protocols != null) {
            req = new _websocket(url, protocols);
          } else {
            req = new _websocket(url);
          }
          if (shouldtrack('socket')) {
            _this.trigger('request', {
              type: 'socket',
              url: url,
              protocols: protocols,
              request: req
            });
          }
          return req;
        };
        try {
          extendnative(window.websocket, _websocket);
        } catch (_error) {}
      }
    }

    return requestintercept;

  })(events);

  _intercept = null;

  getintercept = function() {
    if (_intercept == null) {
      _intercept = new requestintercept;
    }
    return _intercept;
  };

  shouldignoreurl = function(url) {
    var pattern, _j, _len1, _ref2;
    _ref2 = options.ajax.ignoreurls;
    for (_j = 0, _len1 = _ref2.length; _j < _len1; _j++) {
      pattern = _ref2[_j];
      if (typeof pattern === 'string') {
        if (url.indexof(pattern) !== -1) {
          return true;
        }
      } else {
        if (pattern.test(url)) {
          return true;
        }
      }
    }
    return false;
  };

  getintercept().on('request', function(_arg) {
    var after, args, request, type, url;
    type = _arg.type, request = _arg.request, url = _arg.url;
    if (shouldignoreurl(url)) {
      return;
    }
    if (!pace.running && (options.restartonrequestafter !== false || shouldtrack(type) === 'force')) {
      args = arguments;
      after = options.restartonrequestafter || 0;
      if (typeof after === 'boolean') {
        after = 0;
      }
      return settimeout(function() {
        var stillactive, _j, _len1, _ref2, _ref3, _results;
        if (type === 'socket') {
          stillactive = request.readystate < 2;
        } else {
          stillactive = (0 < (_ref2 = request.readystate) && _ref2 < 4);
        }
        if (stillactive) {
          pace.restart();
          _ref3 = pace.sources;
          _results = [];
          for (_j = 0, _len1 = _ref3.length; _j < _len1; _j++) {
            source = _ref3[_j];
            if (source instanceof ajaxmonitor) {
              source.watch.apply(source, args);
              break;
            } else {
              _results.push(void 0);
            }
          }
          return _results;
        }
      }, after);
    }
  });

  ajaxmonitor = (function() {
    function ajaxmonitor() {
      var _this = this;
      this.elements = [];
      getintercept().on('request', function() {
        return _this.watch.apply(_this, arguments);
      });
    }

    ajaxmonitor.prototype.watch = function(_arg) {
      var request, tracker, type, url;
      type = _arg.type, request = _arg.request, url = _arg.url;
      if (shouldignoreurl(url)) {
        return;
      }
      if (type === 'socket') {
        tracker = new socketrequesttracker(request);
      } else {
        tracker = new xhrrequesttracker(request);
      }
      return this.elements.push(tracker);
    };

    return ajaxmonitor;

  })();

  xhrrequesttracker = (function() {
    function xhrrequesttracker(request) {
      var event, size, _j, _len1, _onreadystatechange, _ref2,
        _this = this;
      this.progress = 0;
      if (window.progressevent != null) {
        size = null;
        request.addeventlistener('progress', function(evt) {
          if (evt.lengthcomputable) {
            return _this.progress = 100 * evt.loaded / evt.total;
          } else {
            return _this.progress = _this.progress + (100 - _this.progress) / 2;
          }
        });
        _ref2 = ['load', 'abort', 'timeout', 'error'];
        for (_j = 0, _len1 = _ref2.length; _j < _len1; _j++) {
          event = _ref2[_j];
          request.addeventlistener(event, function() {
            return _this.progress = 100;
          });
        }
      } else {
        _onreadystatechange = request.onreadystatechange;
        request.onreadystatechange = function() {
          var _ref3;
          if ((_ref3 = request.readystate) === 0 || _ref3 === 4) {
            _this.progress = 100;
          } else if (request.readystate === 3) {
            _this.progress = 50;
          }
          return typeof _onreadystatechange === "function" ? _onreadystatechange.apply(null, arguments) : void 0;
        };
      }
    }

    return xhrrequesttracker;

  })();

  socketrequesttracker = (function() {
    function socketrequesttracker(request) {
      var event, _j, _len1, _ref2,
        _this = this;
      this.progress = 0;
      _ref2 = ['error', 'open'];
      for (_j = 0, _len1 = _ref2.length; _j < _len1; _j++) {
        event = _ref2[_j];
        request.addeventlistener(event, function() {
          return _this.progress = 100;
        });
      }
    }

    return socketrequesttracker;

  })();

  elementmonitor = (function() {
    function elementmonitor(options) {
      var selector, _j, _len1, _ref2;
      if (options == null) {
        options = {};
      }
      this.elements = [];
      if (options.selectors == null) {
        options.selectors = [];
      }
      _ref2 = options.selectors;
      for (_j = 0, _len1 = _ref2.length; _j < _len1; _j++) {
        selector = _ref2[_j];
        this.elements.push(new elementtracker(selector));
      }
    }

    return elementmonitor;

  })();

  elementtracker = (function() {
    function elementtracker(selector) {
      this.selector = selector;
      this.progress = 0;
      this.check();
    }

    elementtracker.prototype.check = function() {
      var _this = this;
      if (document.queryselector(this.selector)) {
        return this.done();
      } else {
        return settimeout((function() {
          return _this.check();
        }), options.elements.checkinterval);
      }
    };

    elementtracker.prototype.done = function() {
      return this.progress = 100;
    };

    return elementtracker;

  })();

  documentmonitor = (function() {
    documentmonitor.prototype.states = {
      loading: 0,
      interactive: 50,
      complete: 100
    };

    function documentmonitor() {
      var _onreadystatechange, _ref2,
        _this = this;
      this.progress = (_ref2 = this.states[document.readystate]) != null ? _ref2 : 100;
      _onreadystatechange = document.onreadystatechange;
      document.onreadystatechange = function() {
        if (_this.states[document.readystate] != null) {
          _this.progress = _this.states[document.readystate];
        }
        return typeof _onreadystatechange === "function" ? _onreadystatechange.apply(null, arguments) : void 0;
      };
    }

    return documentmonitor;

  })();

  eventlagmonitor = (function() {
    function eventlagmonitor() {
      var avg, interval, last, points, samples,
        _this = this;
      this.progress = 0;
      avg = 0;
      samples = [];
      points = 0;
      last = now();
      interval = setinterval(function() {
        var diff;
        diff = now() - last - 50;
        last = now();
        samples.push(diff);
        if (samples.length > options.eventlag.samplecount) {
          samples.shift();
        }
        avg = avgamplitude(samples);
        if (++points >= options.eventlag.minsamples && avg < options.eventlag.lagthreshold) {
          _this.progress = 100;
          return clearinterval(interval);
        } else {
          return _this.progress = 100 * (3 / (avg + 3));
        }
      }, 50);
    }

    return eventlagmonitor;

  })();

  scaler = (function() {
    function scaler(source) {
      this.source = source;
      this.last = this.sincelastupdate = 0;
      this.rate = options.initialrate;
      this.catchup = 0;
      this.progress = this.lastprogress = 0;
      if (this.source != null) {
        this.progress = result(this.source, 'progress');
      }
    }

    scaler.prototype.tick = function(frametime, val) {
      var scaling;
      if (val == null) {
        val = result(this.source, 'progress');
      }
      if (val >= 100) {
        this.done = true;
      }
      if (val === this.last) {
        this.sincelastupdate += frametime;
      } else {
        if (this.sincelastupdate) {
          this.rate = (val - this.last) / this.sincelastupdate;
        }
        this.catchup = (val - this.progress) / options.catchuptime;
        this.sincelastupdate = 0;
        this.last = val;
      }
      if (val > this.progress) {
        this.progress += this.catchup * frametime;
      }
      scaling = 1 - math.pow(this.progress / 100, options.easefactor);
      this.progress += scaling * this.rate * frametime;
      this.progress = math.min(this.lastprogress + options.maxprogressperframe, this.progress);
      this.progress = math.max(0, this.progress);
      this.progress = math.min(100, this.progress);
      this.lastprogress = this.progress;
      return this.progress;
    };

    return scaler;

  })();

  sources = null;

  scalers = null;

  bar = null;

  uniscaler = null;

  animation = null;

  cancelanimation = null;

  pace.running = false;

  handlepushstate = function() {
    if (options.restartonpushstate) {
      return pace.restart();
    }
  };

  if (window.history.pushstate != null) {
    _pushstate = window.history.pushstate;
    window.history.pushstate = function() {
      handlepushstate();
      return _pushstate.apply(window.history, arguments);
    };
  }

  if (window.history.replacestate != null) {
    _replacestate = window.history.replacestate;
    window.history.replacestate = function() {
      handlepushstate();
      return _replacestate.apply(window.history, arguments);
    };
  }

  source_keys = {
    ajax: ajaxmonitor,
    elements: elementmonitor,
    document: documentmonitor,
    eventlag: eventlagmonitor
  };

  (init = function() {
    var type, _j, _k, _len1, _len2, _ref2, _ref3, _ref4;
    pace.sources = sources = [];
    _ref2 = ['ajax', 'elements', 'document', 'eventlag'];
    for (_j = 0, _len1 = _ref2.length; _j < _len1; _j++) {
      type = _ref2[_j];
      if (options[type] !== false) {
        sources.push(new source_keys[type](options[type]));
      }
    }
    _ref4 = (_ref3 = options.extrasources) != null ? _ref3 : [];
    for (_k = 0, _len2 = _ref4.length; _k < _len2; _k++) {
      source = _ref4[_k];
      sources.push(new source(options));
    }
    pace.bar = bar = new bar;
    scalers = [];
    return uniscaler = new scaler;
  })();

  pace.stop = function() {
    pace.trigger('stop');
    pace.running = false;
    bar.destroy();
    cancelanimation = true;
    if (animation != null) {
      if (typeof cancelanimationframe === "function") {
        cancelanimationframe(animation);
      }
      animation = null;
    }
    return init();
  };

  pace.restart = function() {
    pace.trigger('restart');
    pace.stop();
    return pace.start();
  };

  pace.go = function() {
    var start;
    pace.running = true;
    bar.render();
    start = now();
    cancelanimation = false;
    return animation = runanimation(function(frametime, enqueuenextframe) {
      var avg, count, done, element, elements, i, j, remaining, scaler, scalerlist, sum, _j, _k, _len1, _len2, _ref2;
      remaining = 100 - bar.progress;
      count = sum = 0;
      done = true;
      for (i = _j = 0, _len1 = sources.length; _j < _len1; i = ++_j) {
        source = sources[i];
        scalerlist = scalers[i] != null ? scalers[i] : scalers[i] = [];
        elements = (_ref2 = source.elements) != null ? _ref2 : [source];
        for (j = _k = 0, _len2 = elements.length; _k < _len2; j = ++_k) {
          element = elements[j];
          scaler = scalerlist[j] != null ? scalerlist[j] : scalerlist[j] = new scaler(element);
          done &= scaler.done;
          if (scaler.done) {
            continue;
          }
          count++;
          sum += scaler.tick(frametime);
        }
      }
      avg = sum / count;
      bar.update(uniscaler.tick(frametime, avg));
      if (bar.done() || done || cancelanimation) {
        bar.update(100);
        pace.trigger('done');
        return settimeout(function() {
          bar.finish();
          pace.running = false;
          return pace.trigger('hide');
        }, math.max(options.ghosttime, math.max(options.mintime - (now() - start), 0)));
      } else {
        return enqueuenextframe();
      }
    });
  };

  pace.start = function(_options) {
    extend(options, _options);
    pace.running = true;
    try {
      bar.render();
    } catch (_error) {
      notargeterror = _error;
    }
    if (!document.queryselector('.pace')) {
      return settimeout(pace.start, 50);
    } else {
      pace.trigger('start');
      return pace.go();
    }
  };

  if (typeof define === 'function' && define.amd) {
    define(function() {
      return pace;
    });
  } else if (typeof exports === 'object') {
    module.exports = pace;
  } else {
    if (options.startonpageload) {
      pace.start();
    }
  }

}).call(this);