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soda.js
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soda.js
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if (! this.soda) (function (main) {
/**
* Namespace: soda - Javascript Asynchronous Loader
*
* Implements a simple asyncronous loader and module pattern based on dynamic
* script tags (or load function for command line Javascript). This intended
* to be loaded before javascript libraries that use the module pattern, allowing
* those libraries to interoperate.
*/
var soda = main.soda = { verison: 0.3 },
// default path to load modules from
defaultLoadPath = null,
// array of arrays, each containimg namespace regex, url prefix and a namespace character count
inc = [],
// script elements and timeouts keyed by module name, for removal
scriptElements = soda.scriptElements = {},
// pending modules
pendingModules = [],
// loaded Module objects keyed by name
modules = {},
// <head> tag to add script elements to
head = main.document ? main.document.getElementsByTagName('head')[0] : false,
// called when a module isn't loaded after the timeout
ontimeout = soda.ontimeout = function (mod, url) {
if (console && console.log)
console.log("Soda: loading module " + mod + " timed out (url: '" + url + "')");
},
// number of seconds to allow for modules to load before debug
timeout = soda.timeout = 20,
isNode = (main.GLOBAL == main),
pathPrefix = '',
fromPath,
// private class: Module - internal representation of a module
Module = function (name, dependencies, code) {
var script;
this.name = name;
this.code = code;
this.ran = false;
this.dependencies =
(typeof(dependencies) == 'array' || dependencies instanceof Array) ?
dependencies : [dependencies];
if (this.name) {
modules[this.name] = this;
script = scriptElements[this.name];
if (script) {
main.clearTimeout(script[1]);
head.removeChild(script[0]);
delete scriptElements[this.name];
}
}
if (this.dependencies.length == 0) {
this.run();
}
else {
pendingModules.push(this);
this.loadDependencies();
}
};
soda.GLOBAL = main;
function nodePathPrefix () {
var sodadir = __filename.split(/[\\\/]/),
cwd = process.cwd().split(/[\\\/]/),
root = '',
found = false,
i = 0,
l = sodadir.length - 2;
sodadir.pop();
sodadir.shift();
cwd.shift();
for (; i < l; i++) {
if (found) {
root += '../';
}
else {
if (cwd[i] != sodadir[i]) {
found = true;
i--;
}
}
}
return root;
}
if (isNode) {
pathPrefix = nodePathPrefix();
fromPath = process.cwd();
}
// private method: Module.run - execute the implementation function, called when dependencies have loaded.
Module.prototype.run = function () {
if (this.name) {
this.ran = true;
if (! (this.namespace = this.code.apply(main, this.dependencies))) {
throw new Error('module "' + this.name + '" did not return a namespace object');
}
this.processPendingDependents();
}
else {
this.code.apply(main, this.dependencies);
}
};
Module.prototype.processPendingDependents = function () {
var run = [], ready, i = 0, l = pendingModules.length, j, jl;
for (; i < l; i++) {
ready = true;
j = 0;
jl = pendingModules[i].dependencies.length;
for (; j < jl; j++) {
if (pendingModules[i].dependencies[j] == this.name) {
pendingModules[i].dependencies[j] = this.namespace;
}
else if (typeof(pendingModules[i].dependencies[j]) == 'string') {
ready = false;
}
}
if (ready) {
run.push(pendingModules[i]);
pendingModules.splice(i--, 1);
l--;
}
}
for (i = 0, l = run.length; i < l; i++) {
run[i].run();
}
};
Module.prototype.loadNodeDependency = function (name) {
if (! isNode) {
throw new Error('can only load node modules when running in node.js');
}
// some shameless duck typing :-p
var mod = modules['node:' + name] = {
'name' : 'node:' + name,
'namespace' : mod,
'ran' : false,
'dependencies' : []
};
require.async(name).addCallback(function (ns) {
mod.ran = true;
mod.namespace = ns;
Module.prototype.processPendingDependents.call(mod);
});
};
function requireErrorCallback (name, path) {
return function () {
throw new Error('could not load module "' + name + '" from path "' + path + '"');
};
}
Module.prototype.loadDependencies = function () {
var url, i, l, j, jl, name, urlBase, script, chars, ready = true;
for (i = 0, l = this.dependencies.length; i < l; i++) {
name = this.dependencies[i];
if (typeof(name) != 'string') continue;
if (name in modules && modules[name].ran) {
this.dependencies[i] = modules[name].namespace;
continue;
}
ready = false;
if (modules[name] || scriptElements[name]) continue;
if (name.substr(0, 5) == 'node:') {
this.loadNodeDependency(name.substr(5));
continue;
}
chars = 0;
for (j = 0, jl = inc.length; j < jl; j++) {
if (inc[j][0].test(name) && inc[j][2] > chars) {
urlBase = inc[j][1];
chars = inc[j][2];
}
}
if (! urlBase) throw new Error("soda.load: no lib configured for '" + name + "'");
url = urlBase + '/' + String(name).replace(/_/g, '/') + '.js';
if (main.document && main.document.createElement && head) {
script = document.createElement('script');
script.setAttribute('type', 'text/javascript');
script.setAttribute('src', url);
// TODO dynamically write onerror attribute for ie
// script.onload = function () { console.log('TODO script ' + url + ' loaded') };
script.onerror = function () { console.log('TODO script ' + url + ' errored') };
head.appendChild(script);
scriptElements[name] = [
script,
ontimeout ?
main.setTimeout(
function () {
if (ontimeout) ontimeout(name, url);
},
timeout * 1000
) : 0
];
}
else if (require && require.async) {
url = url.replace(/\.js$/, '');
require.async(pathPrefix + url)
.addErrback(requireErrorCallback(name, pathPrefix + url));
}
else if (main.load) { // spidermonkey or similar (TODO - require commonjs?)
main.load(url);
}
else {
throw new Error('Soda: cannot load, unsupported environment');
}
}
if (ready) this.run()
};
function dirPath (from, to) {
var pre = '', post = '';
while (from.indexOf(to) != 0) {
post = to.match(/[\\\/](\w+)$/)[1] + '/' + post;
to = to.replace(/[\\\/]\w+$/, '');
}
return (pre + post).replace(/\/$/, '');
}
/**
* Function: soda.lib
*
* Tell Soda where to load modules within a particular namespace from.
*
* Arguments:
* urlPrefix - (string) prefix of the URL to load modules from.
* namespacePrefix(es) - (list of strings) prefix(es) of namespaces to load.
*
* Example:
* soda.lib('http://mylib.com/1.0', 'myLib', 'myOtherLib');
* soda.load('myLib'); // loads http://mylib.com/1.0/myLib.js
* soda.load('myLib_aNamespace'); // loads http://mylib.com/1.0/myLib/aNamespace.js
* soda.load('myOtherLib_anotherNamespace'); // loads http://mylib.com/1.0/myOtherLib/anotherNamespace.js
* soda.load('myLib2'); // throws unknown module error
*/
soda.lib = function (urlPrefix) {
var l = arguments.length - 1, nsPrefix, i;
// TODO handle absolute paths on windows
if (isNode && urlPrefix.indexOf('/') == 0) {
urlPrefix = dirPath(fromPath, urlPrefix);
}
if (l == -1) {
throw new Error('soda.lib: no urlPrefix passed');
}
else if (l == 0) {
if (defaultLoadPath) {
throw new Error('soda.lib: default lib path already set');
}
defaultLoadPath = urlPrefix;
}
else {
for (i = 1; i <= l; i++) {
nsPrefix = arguments[i];
if (! /^\w+(?:_\w+)*$/.test(nsPrefix)) {
throw new Error('invalid namespace prefix "' + nsPrefix + '" passed to soda.lib');
}
inc[inc.length] = [
new RegExp('^' + nsPrefix + '(?:_|$)'),
urlPrefix,
nsPrefix.length
];
}
}
};
/**
* Function: soda.module
*
* Create a new module with the Soda module pattern.
*
* Arguments:
* opts - (object) options object containing:
* name - (string, required) the module name (must correspond to the filename).
* depends - (array of strings, optional) the modules that this module depends on.
* code - (function, required) called when the dependencies are loaded. This is
* where the module implementation is put.
*/
soda.module = function (opts) {
new Module(opts.name, opts.depends || [], opts.code);
};
/**
* Function: soda.load
*
* Load a module/modules and run a function when done.
*
* Arguments:
* modulesToLoad - (string/array of strings) module(s) to load.
* callback - (function, optional) callback to run when the module(/modules) is loaded.
*/
soda.load = function (dependencies, onload) {
new Module(null, dependencies, onload);
};
})(this.GLOBAL || this);