mojito/lib/yui-sandbox.js

/*jslint nomen:true, sloppy: true, stupid: true, node: true*/

'use strict';

var fs = require('fs'),
    path = require('path'),
    vm = require('vm'),
    code = {
        min: fs.readFileSync(path.join(__dirname, '..',
            'node_modules', 'yui', 'yui-nodejs', 'yui-nodejs-min.js'), 'utf8'),
        raw: fs.readFileSync(path.join(__dirname, '..',
            'node_modules', 'yui', 'yui-nodejs', 'yui-nodejs.js'), 'utf8'),
        debug: fs.readFileSync(path.join(__dirname, '..',
            'node_modules', 'yui', 'yui-nodejs', 'yui-nodejs-debug.js'), 'utf8')
    };

/*
    This is a hack to get an isolated YUI object. This is EXPERIMENTAL,
    and eventually we want to have that capability as part of YUI.

    Note: since the new YUI will run in the context of the mojito NPM
    package, we need to replicate all YUI dependencies as part of
    mojito package.json, this hard-dependency can be removed once
    YUI provides a way to create a sandbox.

    How to use this?

    var YUI = require('yui-sandbox.js').getYUI();
    YUI().use('foo');

*/

exports.getYUI = function (filter) {
    var sandbox = {
            console: console,
            process: process,
            require: require,
            module: module,
            setTimeout: setTimeout,
            setInterval: setInterval,
            clearTimeout: clearTimeout,
            clearInterval: clearInterval,
            JSON: JSON,
            __filename: __filename,
            __dirname: path.join(__dirname, '..', 'node_modules', 'yui', 'yui-nodejs'),
            exports: {}
        },
        globalFunction = Function;

    filter = (filter && code.hasOwnProperty(filter)) ? filter : 'raw';
    vm.runInNewContext(code[filter], sandbox, 'build/yui-new/yui-new.js');
    // This is a trick to solve the issue with vm, which is messing with `Function`
    // global variable, which means Y.config.global will not be populated correctly,
    // so we do it manually after getting YUI reference.
    sandbox.exports.YUI.applyConfig({
        global: globalFunction('return this')()
    });
    return sandbox.exports.YUI;
};