(function (global) {
    "use strict";

    function Map() {
        this.data = {}
    }
    function EventTarget() {
        this.listeners = new Map
    }
    function throwError(e) {
        setTimeout(function () {
            throw e
        }, 0)
    }
    function Event(type) {
        this.type = type
    }
    function MessageEvent(type, options) {
        Event.call(this, type), this.data = options.data, this.lastEventId = options.lastEventId
    }
    function getDuration(value, def) {
        var n = Number(value);
        return (n < 1 ? 1 : n > 18e6 ? 18e6 : n) || def
    }
    function fire(that, property, event) {
        try {
            typeof that[property] == "function" && that[property](event)
        } catch (e) {
            throwError(e)
        }
    }
    function EventSource(url, options) {
        function close() {
            currentState = CLOSED, xhr !== null && (xhr.abort(), xhr = null), timeout !== 0 && (clearTimeout(timeout), timeout = 0), that.readyState = CLOSED
        }
        function onProgress(isLoadEnd) {
            var responseText = currentState === OPEN || currentState === CONNECTING ? xhr.responseText || "" : "",
                event = null;
            if (currentState === CONNECTING) {
                var contentType = isXHR ? responseText !== "" ? xhr.getResponseHeader("Content-Type") : "" : xhr.contentType;
                if (contentType && contentTypeRegExp.test(contentType)) {
                    currentState = OPEN, wasActivity = !0, retry = initialRetry, that.readyState = OPEN, event = new Event("open"), that.dispatchEvent(event), fire(that, "onopen", event);
                    if (currentState === CLOSED) return
                }
            }
            if (currentState === OPEN) {
                responseText.length > charOffset && (wasAct = !0, wasActivity = !0);
                var i = 0,
                    i1 = responseText.indexOf("\r", charOffset),
                    i2 = responseText.indexOf("\n", charOffset);
                while (i1 !== -1 || i2 !== -1) {
                    i1 === -1 || i2 !== -1 && i2 < i1 ? (i = i2, i2 = responseText.indexOf("\n", i + 1)) : (i = i1, i1 = responseText.indexOf("\r", i + 1));
                    var line = responseText.slice(charOffset, i),
                        oldWasCR = wasCR;
                    wasCR = responseText.slice(i, i + 1) === "\r", charOffset = i + 1;
                    if (!oldWasCR || line.length !== 0 || wasCR) {
                        responseBuffer.push(line);
                        var field = responseBuffer.join("");
                        responseBuffer.length = 0;
                        if (field !== "") {
                            var value = "",
                                j = field.indexOf(":", 0);
                            j !== -1 && (value = field.slice(j + (field.slice(j + 1, j + 2) === " " ? 2 : 1)), field = field.slice(0, j)), field === "data" ? dataBuffer.push(value) : field === "id" ? lastEventIdBuffer = value : field === "event" ? eventTypeBuffer = value : field === "retry" ? (initialRetry = getDuration(value, initialRetry), retry = initialRetry, retryLimit < initialRetry && (retryLimit = initialRetry)) : field === "retryLimit" ? retryLimit = getDuration(value, retryLimit) : field === "heartbeatTimeout" && (heartbeatTimeout = getDuration(value, heartbeatTimeout), timeout !== 0 && (clearTimeout(timeout), timeout = setTimeout(onTimeout, heartbeatTimeout)))
                        } else {
                            if (dataBuffer.length !== 0) {
                                lastEventId = lastEventIdBuffer;
                                var type = eventTypeBuffer || "message";
                                event = new MessageEvent(type, {
                                    data: dataBuffer.join("\n"),
                                    lastEventId: lastEventIdBuffer
                                }), that.dispatchEvent(event), type === "message" && fire(that, "onmessage", event);
                                if (currentState === CLOSED) return
                            }
                            dataBuffer.length = 0, eventTypeBuffer = ""
                        }
                    }
                }
                charOffset !== responseText.length && (responseBuffer.push(responseText.slice(charOffset)), charOffset = responseText.length)
            }
            wasAct && progressTimeout === 0 && (wasAct = !1, progressTimeout = setTimeout(p, 80)), currentState !== OPEN && currentState !== CONNECTING || !(isLoadEnd || charOffset > 1048576 || timeout === 0 && !wasActivity) ? timeout === 0 && (wasActivity = !1, timeout = setTimeout(onTimeout, heartbeatTimeout)) : (currentState = WAITING, xhr.abort(), timeout !== 0 && (clearTimeout(timeout), timeout = 0), retry > retryLimit && (retry = retryLimit), timeout = setTimeout(onTimeout, retry), retry = retry * 2 + 1, that.readyState = CONNECTING, event = new Event("error"), that.dispatchEvent(event), fire(that, "onerror", event))
        }
        function p() {
            progressTimeout = 0, onProgress(!1)
        }
        function onProgress2() {
            onProgress(!1)
        }
        function onLoadEnd() {
            onProgress(!0)
        }
        function onTimeout() {
            timeout = 0;
            if (currentState !== WAITING) {
                onProgress(!1);
                return
            }
            if (navigator.onLine === !1) {
                timeout = setTimeout(onTimeout, 500);
                return
            }
            if (webkitBefore535 && global.document && (global.document.readyState === "loading" || global.document.readyState === "interactive")) {
                timeout = setTimeout(onTimeout, 100);
                return
            }
            xhr.onload = xhr.onerror = onLoadEnd, xhr.mozAnon === undefined ? xhr.onprogress = onProgress2 : xhr.onreadystatechange = onProgress2, wasActivity = !1, timeout = setTimeout(onTimeout, heartbeatTimeout), charOffset = 0, currentState = CONNECTING, dataBuffer.length = 0, eventTypeBuffer = "", lastEventIdBuffer = lastEventId, responseBuffer.length = 0, wasCR = !1, xhr.open("GET", url + ((url.indexOf("?", 0) === -1 ? "?" : "&") + "lastEventId=" + encodeURIComponent(lastEventId) + "&r=" + String(Math.random() + 1).slice(2)), !0), xhr.withCredentials = withCredentials, xhr.responseType = "text", isXHR && xhr.setRequestHeader("Accept", "text/event-stream"), xhr.send(null)
        }
        url = String(url);
        var withCredentials = Boolean(xhr2 && options && options.withCredentials),
            initialRetry = getDuration(options ? options.retry : NaN, 1e3),
            retryLimit = getDuration(options ? options.retryLimit : NaN, 3e5),
            heartbeatTimeout = getDuration(options ? options.heartbeatTimeout : NaN, 45e3),
            lastEventId = options && options.lastEventId && String(options.lastEventId) || "",
            that = this,
            retry = initialRetry,
            wasActivity = !1,
            xhr = new Transport,
            timeout = 0,
            charOffset = 0,
            currentState = WAITING,
            dataBuffer = [],
            lastEventIdBuffer = "",
            eventTypeBuffer = "",
            responseBuffer = [],
            wasCR = !1,
            progressTimeout = 0,
            wasAct = !1;
        options = null, EventTarget.call(this), this.close = close, this.url = url, this.readyState = CONNECTING, this.withCredentials = withCredentials, onTimeout()
    }
    function F() {
        this.CONNECTING = CONNECTING, this.OPEN = OPEN, this.CLOSED = CLOSED
    }
    Map.prototype = {
        get: function (key) {
            return this.data[key + "~"]
        },
        set: function (key, value) {
            this.data[key + "~"] = value
        },
        "delete": function (key) {
            delete this.data[key + "~"]
        }
    }, EventTarget.prototype = {
        dispatchEvent: function (event) {
            var type = String(event.type),
                listeners = this.listeners,
                typeListeners = listeners.get(type);
            if (!typeListeners) return;
            var length = typeListeners.length,
                i = -1;
            while (++i < length) {
                var listener = typeListeners[i];
                try {
                    listener.call(this, event)
                } catch (e) {
                    throwError(e)
                }
            }
        },
        addEventListener: function (type, callback) {
            type = String(type);
            var listeners = this.listeners,
                typeListeners = listeners.get(type);
            typeListeners || listeners.set(type, typeListeners = []);
            var i = typeListeners.length;
            while (--i >= 0) if (typeListeners[i] === callback) return;
            typeListeners.push(callback)
        },
        removeEventListener: function (type, callback) {
            type = String(type);
            var listeners = this.listeners,
                typeListeners = listeners.get(type);
            if (!typeListeners) return;
            var length = typeListeners.length,
                filtered = [],
                i = -1;
            while (++i < length) typeListeners[i] !== callback && filtered.push(typeListeners[i]);
            filtered.length === 0 ? listeners["delete"](type) : listeners.set(type, filtered)
        }
    }, MessageEvent.prototype = Event.prototype;
    var XHR = global.XMLHttpRequest,
        XDR = global.XDomainRequest,
        xhr2 = Boolean(XHR && (new XHR).withCredentials !== undefined),
        isXHR = xhr2,
        Transport = xhr2 ? XHR : XDR,
        WAITING = -1,
        CONNECTING = 0,
        OPEN = 1,
        CLOSED = 2,
        contentTypeRegExp = /^text\/event\-stream;?(\s*charset\=utf\-8)?$/i,
        webkitBefore535 = /AppleWebKit\/5([0-2][0-9]|3[0-4])[^\d]/.test(navigator.userAgent);
    F.prototype = EventTarget.prototype, EventSource.prototype = new F, F.call(EventSource), Transport && (global.EventSource = EventSource)
 })(this),
function () {
    function record(name) {
        (new Image).src = "http://xkcd.com/events/" + name
    }
    function log() {
        location.hash == "#verbose" && console.log.apply(console, arguments)
    }
    try {
        var esURL = "http://c0.xkcd.com/stream/comic/time?method=EventSource",
            source = new EventSource(esURL);
        log("connecting to event source:", esURL), source.addEventListener("open", function (ev) {
            record("connect_start")
        }, !1), source.addEventListener("error", function (ev) {
            record("connect_error")
        }, !1), source.addEventListener("loadtest", log, !1), source.addEventListener("comic/time", log, !1), source.addEventListener("comic/time", function (ev) {
            var data = JSON.parse(ev.data),
                img = document.getElementById("comic").getElementsByTagName("img")[0],
                delay = Math.round(Math.random() * data.spread);
            log("waiting", delay, "seconds before displaying comic", data.image), setTimeout(function () {
                img.src = "http://imgs.xkcd.com/comics/time/" + data.image
            }, delay * 1e3)
        }, !1)
    } catch (e) {
        record("js_error")
    }
}();