SimpleMachines / SMF2.1

(function (document, sceditor) {

	'use strict';

	var dom = sceditor.dom;

	/*

		(^|\s)					Start of line or space

		(?:https?:\/\/)?  		Optional scheme like http://

		(?:www\.)?      		Optional www. prefix

		(?:

			youtu\.be\/     	Ends with .be/ so whatever comes next is the ID

		|

			youtube\.com\/watch\?v=		Matches the .com version

		)

		([^"&?\/ ]{11}) 				The actual YT ID

		(?:\&[\&_\?0-9a-z\#]+)?			Any extra URL params

		(\s|$)							End of line or space

	*/

	var ytUrlRegex = /(^|\s)(?:https?:\/\/)?(?:www\.)?(?:youtu\.be\/|youtube\.com\/watch\?v=)([^"&?\/ ]{11})(?:\&[\&_\?0-9a-z\#]+)?(\s|$)/i;

	function youtubeEmbedCode(id) {

		return '<div class="videocontainer"><div><iframe frameborder="0" ' +

			'src="https://www.youtube-nocookie.com/embed/' + id + '" ' +

			'data-youtube-id="' + id + '" allowfullscreen></iframe></div></div>';

	}

	function convertYoutubeLinks(root) {

		var node = root.firstChild;

		while (node) {

			// 3 is TextNodes

			if (node.nodeType === 3) {

				var text   = node.nodeValue;

				var parent = node.parentNode;

				var match  = text.match(ytUrlRegex);

				if (match) {

					parent.insertBefore(document.createTextNode(

						text.substr(0, match.index) + match[1]

					), node);

					parent.insertBefore(

						dom.parseHTML(youtubeEmbedCode(match[2])), node

					);

					node.nodeValue = match[3] +

						text.substr(match.index + match[0].length);

				}

			} else {

				// TODO: Make this tag configurable.

				if (!dom.is(node, 'code')) {

					convertYoutubeLinks(node);

				}

			}

			node = node.nextSibling;

		}

	};

	sceditor.plugins.autoyoutube = function () {

		this.signalPasteRaw = function (data) {

			// TODO: Make this tag configurable.

			// Skip code tags

			if (dom.closest(this.currentNode(), 'code')) {

				return;

			}

			if (data.text) {

				var html = document.createElement('div');

				html.textContent = data.text;

				convertYoutubeLinks(html);

				data.html = html.innerHTML;

			}

		};

	};

})(document, sceditor);