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addEventListener("load", function() {

var editor = CodeMirror.fromTextArea(document.querySelector("#editor"), {

mode: "javascript",

extraKeys: {

"Ctrl-Enter": runCode

},

matchBrackets: true,

lineNumbers: true

});

function guessType(code) {

return /^[\s\w\n:]*</.test(code) ? "html" : "js";

}

var reGuess;

editor.on("change", function() {

clearTimeout(reGuess);

reGuess = setTimeout(function() {

if (context.type == null) {

var mode = guessType(editor.getValue()) == "html" ? "text/html" : "javascript";

if (mode != editor.getOption("mode"))

editor.setOption("mode", mode);

}

}, 500);

});

function hasIncludes(code, include) {

if (!include) return code;

var re = /(?:\s|<!--.*?-->)*<script src="([^"]*)"><\/script>/g, m;

var found = [];

while (m = re.exec(code)) found.push(m[1]);

return include.every(function(s) { return found.indexOf(s) > -1; });

}

function setEditorCode(code, type) {

editor.setValue(code);

editor.setOption("mode", (type || guessType(code)) == "html" ? "text/html" : "javascript");

}

function opt(value, label) {

var node = document.createElement("option");

node.value = value;

node.textContent = label || value;

return node;

}

function getChapter(number) {

for (var i = 0; i < chapterData.length; i++)

if (chapterData[i].number == number)

return chapterData[i];

}

function getURL(url, callback) {

var req = new XMLHttpRequest();

req.open("GET", url, true);

req.addEventListener("load", function() {

if (req.status < 400)

callback(null, req.responseText);

else

callback(new Error("Request failed: " + req.statusText));

});

req.addEventListener("error", function() {

callback(new Error("Network error"));

});

req.send(null);

}

var per = document.querySelector("#per_chapter");

per.addEventListener("change", function() {

selectContext(per.value);

document.location.hash = "#" + (per.value == "box" ? chapters.value : per.value);

});

var fileList = document.querySelector("#files");

var fileInfo = document.querySelector("#fileInfo");

var runLocally = document.querySelector("#runLocally");

var localFileList = document.querySelector("#local-files");

function addItem(container, link) {

var li = container.appendChild(document.createElement("li"));

var a = li.appendChild(document.createElement("a"));

a.href = link;

a.textContent = link.replace(/^code\//, "");

}

function selectChapter(number, context) {

per.textContent = "";

var chapter = getChapter(number);

if (chapter.exercises.length) {

per.appendChild(opt("box", "Select an exercise"));

chapter.exercises.forEach(function(exercise) {

var num = chapter.number + "." + exercise.number;

per.appendChild(opt(num, num + " " + exercise.name));

});

} else {

per.appendChild(opt("box", "This chapter has no exercises"));

}

fileInfo.style.display = runLocally.style.display = "none";

fileList.textContent = localFileList.textContent = "";

if (chapter.links) chapter.links.forEach(function(file, i) {

if (!i) runLocally.style.display = "";

addItem(localFileList, file);

});

if (chapter.include) chapter.include.forEach(function(file, i) {

if (!i) fileInfo.style.display = "";

addItem(fileList, file);

});

selectContext(context || "box");

}

function findExercise(id, chapter) {

var parts = id.split(".");

if (!chapter) chapter = getChapter(parts[0]);

for (var i = 0; i < chapter.exercises.length; i++)

if (chapter.exercises[i].number == +parts[1])

return chapter.exercises[i];

}

var context = {include: []};

function selectContext(value) {

output.clear();

clearSandbox();

var chapter = getChapter(chapters.value), visible;

if (value == "box") {

var code = (chapters.value < 20 || chapters.value > 21)

? "Run code here in the context of Chapter " + chapter.number

: "Code from Node.js chapters can't be run in the browser";

var guessed = guessType(chapter.start_code);

if (guessed == "js")

code = "// " + code;

else

code = "<!-- " + code + "-->";

if (chapter.start_code) code += "\n\n" + chapter.start_code;

context = {include: chapter.include};

setEditorCode(code, guessed);

visible = "box";

} else {

var exercise = findExercise(value, chapter);

context = {include: chapter.include,

solution: exercise.solution,

type: exercise.type};

setEditorCode(exercise.code, exercise.type);

visible = "exercise";

var link = document.querySelector("#download");

if (/\.zip$/.test(exercise.file))

link.href = exercise.file

else

link.href = "data:text/plain;charset=UTF-8," + exercise.solution;

}

["box", "exercise"].forEach(function(id) {

document.querySelector("#" + id + "_info").style.display =

(id == visible ? "" : "none");

});

}

var outnode = document.querySelector(".sandbox-output");

var output = new SandBox.Output(outnode);

document.querySelector("#run").addEventListener("click", runCode);

var sandbox;

function clearSandbox() {

if (sandbox) {

sandbox.frame.parentNode.removeChild(sandbox.frame);

sandbox = null;

}

}

function runCode() {

clearSandbox();

var val = editor.getValue(), type = context.type || guessType(val);

sandbox = new SandBox({

loadFiles: hasIncludes(val, context.include) ? [] : context.include,

place: type == "html" &&

function(node) { outnode.parentNode.insertBefore(node, outnode); }

}, function(box) {

output.clear();

if (type == "html")

box.setHTML(val, output);

else

box.run(val, output);

});

}

document.querySelector("#solution").addEventListener("click", function() {

setEditorCode(context.solution, context.type);

});

var chapters = document.querySelector("#chapters");

chapterData.forEach(function(chapter) {

chapters.appendChild(opt(chapter.number, chapter.number + ". " + chapter.title));

chapter.exercises.forEach(function(exercise) {

exercise.chapter = chapter;

});

});

chapters.addEventListener("change", function() {

selectChapter(chapters.value);

document.location.hash = "#" + chapters.value;

});

function parseFragment() {

var hash = document.location.hash.slice(1);

var valid = /^(\d+)(?:\.(\d+))?$/.exec(hash);

if (valid) {

var chapter = getChapter(Number(valid[1]));

var exercise = chapter && valid[2] && findExercise(hash, chapter);

if (!chapter || valid[2] && !exercise) valid = null;

}

if (valid) {

var perValue = exercise ? hash : "box", setPer = false;

if (chapters.value != valid[1]) {

chapters.value = valid[1];

selectChapter(Number(valid[1]), perValue);

setPer = true;

}

if (per.value != perValue) {

per.value = perValue;

if (!setPer) selectContext(perValue);

}

return true;

}

}

parseFragment() || selectChapter(0, "box");

addEventListener("hashchange", parseFragment);

});