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(function() {
var map = {}, root = [], reqs = {}, q = [], CREATED = 0, QUEUED = 1, REQUESTED = 2, LOADED = 3, COMPLETE = 4, FAILED = 5;
function Requirement(url) {
this.url = url;
this.listeners = [];
this.status = CREATED;
this.children = [];
reqs[url] = this;
}
Requirement.prototype = {
push: function push(child) { this.children.push(child); },
check: function check() {
var list = this.children, i = list.length, l;
while (i) { if (list[--i].status !== COMPLETE) return; }
this.status = COMPLETE;
for (list = this.listeners, l = list.length; i < l; ++i) { list[i](); }
},
loaded: function loaded() {
this.status = LOADED;
this.check();
if (q.shift() === this && q.length) q[0].load();
},
failed: function failed() {
this.status = FAILED;
if (q.shift() === this && q.length) q[0].load();
},
load: function load() {
var r = this, d = document, s = d.createElement('script');
s.type = 'text/javascript';
s.src = r.url;
s.requirement = r;
function cleanup() {
if (!s.onload) return true;
s.onload = s.onerror = s.onreadystatechange = null;
d.body.removeChild(s);
}
s.onload = function onload() { if (!cleanup()) r.loaded(); };
s.onerror = function onerror() { if (!cleanup()) r.failed(); };
if (s.readyState) {
s.onreadystatechange = function () { if (s.readyState === 'complete' || s.readyState === 'loaded') s.onload(); };
}
r.status = REQUESTED;
d.body.appendChild(s);
},
request: function request(onready) {
this.listeners.push(onready);
if (this.status === COMPLETE) { onready(); return; }
var tags = document.getElementsByTagName('script'), i = tags.length, parent = 0;
while (i && !parent) { parent = tags[--i].requirement; }
(parent || root).push(this);
if (parent) this.listeners.push(function() { parent.check(); });
if (this.status === CREATED) {
this.status = QUEUED;
if (q.push(this) === 1) { this.load(); }
}
}
};
function resolve(name) {
if (/\/|\\|\.js$/.test(name)) return name;
if (map[name]) return map[name];
var parts = name.split('.'), used = [], ns;
while (parts.length) {
if (map[ns = parts.join('.')]) return map[ns] + used.reverse().join('/') + '.js';
used.push(parts.pop());
}
return used.reverse().join('/') + '.js';
}
function absolutize(url) {
if (/^(https?|ftp|file):/.test(url)) return url;
return (/^\//.test(url) ? absolutize.base : absolutize.path) + url;
}
(function () {
var tags = document.getElementsByTagName('base'), href = (tags.length ? tags.get(tags.length - 1) : location).href;
absolutize.path = href.substr(0, href.lastIndexOf('/') + 1) || href;
absolutize.base = href.split(/\\|\//).slice(0, 3).join('/');
})();
function require(arr, onready) {
if (typeof arr === 'string') arr = [ arr ];
if (typeof onready !== 'function') onready = false;
var left = arr.length, i = arr.length;
if (!left && onready) onready();
while (i) {
var url = absolutize(resolve(arr[--i])), req = reqs[url] || new Requirement(url);
req.request(function check() { if (!--left && onready) onready(); });
}
}
require.map = function mapto(name, loc) { map[name] = loc; };
require.unmap = function unmap(name) { delete map[name]; };
require.tree = root;
jQuery.require = require;
})();
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