pace.js

/*!
 * pace.js v1.2.4
 * https://github.com/CodeByZach/pace/
 * Licensed MIT © HubSpot, Inc.
 */
(function() {
	var AjaxMonitor, Bar, DocumentMonitor, ElementMonitor, ElementTracker, EventLagMonitor, Evented, Events, NoTargetError, Pace, RequestIntercept, SOURCE_KEYS, Scaler, SocketRequestTracker, XHRRequestTracker, addEventListener, 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; },
		__bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; };

	defaultOptions = {
		className: '',
		catchupTime: 100,
		initialRate: .03,
		minTime: 250,
		ghostTime: 100,
		maxProgressPerFrame: 20,
		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;

	addEventListener = function(obj, event, callback) {
		if (typeof obj.addEventListener === "function") {
			return obj.addEventListener(event, callback, false);
		} else {
			return function() {
				if (typeof obj["on" + event] !== "function" || typeof obj["on" + event].eventListeners !== "object") {
					var eventListeners = new Events();
					if (typeof obj["on" + event] === "function") {
						eventListeners.on(event, obj["on" + event]);
					}
					obj["on" + event] = function(evt) {
						return eventListeners.trigger(event, evt);
					};
					obj["on" + event].eventListeners = eventListeners;
				} else {
					var eventListeners = obj["on" + event].eventListeners;
				}
				eventListeners.on(event, callback);
			}();
		}
	};

	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;

	})();

	Pace = window.Pace || {};

	window.Pace = 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 )|/, 'pace-running ');
				var _custom_class_name = (options.className !== '') ? ' '+options.className : '';
				this.el.innerHTML = '<div class="pace-progress'+_custom_class_name+'">\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', 'pace-inactive');
			return document.body.className = document.body.className.replace('pace-running ', 'pace-done ');
		};

		Bar.prototype.update = function(prog) {
			this.progress = prog;
			Pace.trigger('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, key, progressStr, transform, _j, _len1, _ref2;
			if (document.querySelector(options.target) == null) {
				return false;
			}
			el = this.getElement();
			transform = "translate3d(" + this.progress + "%, 0, 0)";
			_ref2 = ['webkitTransform', 'msTransform', 'transform'];
			for (_j = 0, _len1 = _ref2.length; _j < _len1; _j++) {
				key = _ref2[_j];
				el.children[0].style[key] = transform;
			}
			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);
			}
			Pace.trigger('change', this.progress);
			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, _results;
		_results = [];
		for (key in from.prototype) {
			try {
				if ((to[key] == null) && typeof from[key] !== 'function') {
					if (typeof Object.defineProperty === 'function') {
						_results.push(Object.defineProperty(to, key, {
							get: (function(key) {
								return function() {
									return from.prototype[key];
								};
							})(key),
							configurable: true,
							enumerable: true
						}));
					} else {
						_results.push(to[key] = from.prototype[key]);
					}
				} 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 < 1;
				} 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() {
			this.complete = __bind(this.complete, this);
			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, this.complete);
			} else {
				tracker = new XHRRequestTracker(request, this.complete);
			}
			return this.elements.push(tracker);
		};

		AjaxMonitor.prototype.complete = function(tracker) {
			return this.elements = this.elements.filter(function(e) {
				return e !== tracker;
			});
		};

		return AjaxMonitor;

	})();

	XHRRequestTracker = (function() {
		function XHRRequestTracker(request, completeCallback) {
			var event, size, _j, _len1, _onreadystatechange, _ref2,
				_this = this;
			this.progress = 0;
			if (window.ProgressEvent != null) {
				size = null;
				addEventListener(request, 'progress', function(evt) {
					if (evt.lengthComputable) {
						return _this.progress = 100 * evt.loaded / evt.total;
					} else {
						return _this.progress = _this.progress + (100 - _this.progress) / 2;
					}
				}, false);
				_ref2 = ['load', 'abort', 'timeout', 'error'];
				for (_j = 0, _len1 = _ref2.length; _j < _len1; _j++) {
					event = _ref2[_j];
					addEventListener(request, event, function() {
						completeCallback(_this);
						return _this.progress = 100;
					}, false);
				}
			} else {
				_onreadystatechange = request.onreadystatechange;
				request.onreadystatechange = function() {
					var _ref3;
					if ((_ref3 = request.readyState) === 0 || _ref3 === 4) {
						completeCallback(_this);
						_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, completeCallback) {
			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];
				addEventListener(request, event, function() {
					completeCallback(_this);
					return _this.progress = 100;
				}, false);
			}
		}

		return SocketRequestTracker;

	})();

	ElementMonitor = (function() {
		function ElementMonitor(options) {
			var selector, _j, _len1, _ref2;
			if (options == null) {
				options = {};
			}
			this.complete = __bind(this.complete, this);
			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, this.complete));
			}
		}

		ElementMonitor.prototype.complete = function(tracker) {
			return this.elements = this.elements.filter(function(e) {
				return e !== tracker;
			});
		};

		return ElementMonitor;

	})();

	ElementTracker = (function() {
		function ElementTracker(selector, completeCallback) {
			this.selector = selector;
			this.completeCallback = completeCallback;
			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() {
			this.completeCallback(this);
			this.completeCallback = null;
			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);