dogescript-3/index.js

an unofficial third version of dogescript

/**
 * dogescript - wow so syntax such language
 *
 * Copyright (c) 2013-2014 Zach Bruggeman
 *
 * dogescript is licensed under the MIT License.
 *
 * @package dogescript
 * @author  Zach Bruggeman <talkto@zachbruggeman.me>
 */

var compile = require("./lib/compile");
var parser = require("./lib/parser");
var xhr = require("xhr");

function parse (file) {
	return compile(parser.parse(file));
}

module.exports = parse;

if (typeof window === 'object' && window !== null) {
	var queue = [];
	var seen = [];

	var stepQueue = function () {
		while (queue.length > 0 && queue[0].ready) {
			var script = queue.shift();
			exec(script.text);
		}
	}

	var exec = function (source) {
		var js = ';\n' + parse(source);
		if (js) {
			window.eval(js);
		}
	}

	var getLoadEval = function (script) {
		var res = {
			type: 'load',
			ready: false,
			text: ''
		};

		xhr(script.getAttribute('src'), function (err, resp, body) {
			if (err) {
				throw err;
			}
			res.ready = true;
			if (body) {
				res.text = body;
			}
			stepQueue();
		});
		return res;
	}

	var getInlineEval = function (script) {
		return {
			type: 'inline',
			ready: true,
			text: script.innerHTML
		};
	}

	var processTags = function () {
		var scripts = document.getElementsByTagName('script');

		for (var i = 0; i < scripts.length; i++) {
			var script = scripts[i];
			if (seen.indexOf(script) > -1) {
				continue;
			}
			seen.push(script);

			if (script.getAttribute('type') === 'text/dogescript') {
				if (script.getAttribute('src')) {
					queue.push(getLoadEval(script));
				} else {
					queue.push(getInlineEval(script));
				}
			}
		}
		stepQueue();
	}

	if (window.addEventListener) {
		window.addEventListener('DOMContentLoaded', processTags);
	} else {
		window.attachEvent('onload', processTags);
	}
}