( function( window, settings ) {

	function wpEmoji() {

		var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver,

		/**

		 * Flag to determine if we should replace emoji characters with images.

		 *

		 * @since 4.2.0

		 *

		 * @var Boolean

		 */

		replaceEmoji = false,

		// Private

		twemoji, timer,

		loaded = false,

		count = 0;

		/**

		 * Runs when the document load event is fired, so we can do our first parse of the page.

		 *

		 * @since 4.2.0

		 */

		function load() {

			if ( loaded ) {

				return;

			}

			if ( typeof window.twemoji === 'undefined' ) {

				// Break if waiting for longer than 30 sec.

				if ( count > 600 ) {

					return;

				}

				// Still waiting.

				window.clearTimeout( timer );

				timer = window.setTimeout( load, 50 );

				count++;

				return;

			}

			twemoji = window.twemoji;

			loaded = true;

			if ( MutationObserver ) {

				new MutationObserver( function( mutationRecords ) {

					var i = mutationRecords.length,

						addedNodes, removedNodes, ii, node;

					while ( i-- ) {

						addedNodes = mutationRecords[ i ].addedNodes;

						removedNodes = mutationRecords[ i ].removedNodes;

						ii = addedNodes.length;

						if (

							ii === 1 && removedNodes.length === 1 &&

							addedNodes[0].nodeType === 3 &&

							removedNodes[0].nodeName === 'IMG' &&

							addedNodes[0].data === removedNodes[0].alt

						) {

							return;

						}

						while ( ii-- ) {

							node = addedNodes[ ii ];

							if ( node.nodeType === 3 ) {

								node = node.parentNode;

							}

							if ( ! node || ( node.className && node.className.indexOf( 'wp-exclude-emoji' ) !== -1 ) ) {

								continue;

							}

							if ( node && node.nodeType === 1 ) {

								parse( node );

							}

						}

					}

				} ).observe( document.body, {

					childList: true,

					subtree: true

				} );

			}

			parse( document.body );

		}

		/**

		 * Given an element or string, parse any emoji characters into Twemoji images.

		 *

		 * @since 4.2.0

		 *

		 * @param {HTMLElement|String} object The element or string to parse.

		 * @param {Object} args Additional options for Twemoji.

		 */

		function parse( object, args ) {

			if ( ! replaceEmoji || ! twemoji ) {

				return object;

			}

			args = args || {};

			return twemoji.parse( object, {

				base: settings.baseUrl,

				ext: settings.ext,

				className: args.className || 'emoji',

				imgAttr: args.imgAttr,

				callback: function( icon, options ) {

					// Ignore some standard characters that TinyMCE recommends in its character map.

					switch ( icon ) {

						case 'a9':

						case 'ae':

						case '2122':

						case '2194':

						case '2660':

						case '2663':

						case '2665':

						case '2666':

							return false;

					}

					if ( ! settings.supports.flag && settings.supports.simple &&

						! /^1f1(?:e[6-9a-f]|f[0-9a-f])-1f1(?:e[6-9a-f]|f[0-9a-f])$/.test( icon ) ) {

						return false;

					}

					return ''.concat( options.base, icon, options.ext );

				}

			} );

		}

		/**

		 * Initialize our emoji support, and set up listeners.

		 */

		if ( settings ) {

			replaceEmoji = ! settings.supports.simple || ! settings.supports.flag;

			if ( settings.DOMReady ) {

				load();

			} else {

				settings.readyCallback = load;

			}

		}

		return {

			replaceEmoji: replaceEmoji,

			parse: parse

		};

	}

	window.wp = window.wp || {};

	window.wp.emoji = new wpEmoji();

} )( window, window._wpemojiSettings );