markup.js
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markup.js
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	// influenced by https://bl.ocks.org/tomgp/c99a699587b5c5465228

	function render_markup_for_server(callback) {
	var virtual_window = MG.virtual_window;
	var virtual_d3 = d3.select(virtual_window.document);
	var target = virtual_window.document.createElement('div');

	var original_d3 = global.d3;
	var original_window = global.window;
	var original_document = global.document;
	global.d3 = virtual_d3;
	global.window = virtual_window;
	global.document = virtual_window.document;

	var error;
	try {
	callback(target);
	} catch(e) {
	error = e;
	}

	global.d3 = original_d3;
	global.window = original_window;
	global.document = original_document;

	if (error) {
	throw error;
	}

	/* for some reason d3.select parses jsdom elements incorrectly
	* but it works if we wrap the element in a function.
	*/
	return virtual_d3.select(function targetFn() {
	return target;
	}).html();
	}

	function render_markup_for_client(callback) {
	var target = document.createElement('div');
	callback(target);
	return d3.select(target).html();
	}

	function render_markup(callback) {
	switch(typeof window) {
	case 'undefined':
	return render_markup_for_server(callback);
	default:
	return render_markup_for_client(callback);
	}
	}

	function init_virtual_window(jsdom, force) {
	if (MG.virtual_window && !force) {
	return;
	}

	var doc = jsdom.jsdom({
	html: '',
	features: { QuerySelector: true }
	});
	MG.virtual_window = doc.defaultView;
	}

	MG.render_markup = render_markup;
	MG.init_virtual_window = init_virtual_window;